Abstract

In a scroll compressor, at an end plate surface of a fixed scroll, an annular back pressure groove connected to a back pressure chamber is provided, and an arc-shaped first groove and an arc-shaped second groove are provided inside the back pressure groove in a radial direction. A distance between the second groove and the back pressure groove is shorter than a distance between the first groove and the back pressure groove. A revolving scroll is provided with a first hole and a second hole for guiding lubricant oil from an oil supply path to the end plate surface side of the fixed scroll. At least part of a movement locus of an opening of the first hole is included in the first groove. At least part of a movement locus of an opening of the second hole is included in the second groove. The first groove and the second groove at least partially overlap with each other in the radial direction.

IPC Classes  ?

• F04C 18/02 - Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
• F04C 29/00 - Component parts, details, or accessories, of pumps or pumping installations specially adapted for elastic fluids, not provided for in groups
• F04C 29/02 - Lubrication; Lubricant separation 

Abstract

A controller includes a first storage storing setting information used for operation control of a heat exchange system that exchanges heat between fluid and a heat medium. The controller executes operation control using the setting information. A communicator includes a second storage medium storing setting information used for the operation control, the communicator communicates with external equipment, the controller and the communicator are mounted on an identical outdoor unit, an identical indoor unit, or an identical central control panel. The controller and the communicator execute synchronization processing between the setting information stored in the first storage and the setting information stored in the second storage, and in a case where the setting information stored in the second storage has been changed in response to a request from the external equipment, the communicator transmits the changed setting information to the controller in the synchronization processing.

IPC Classes  ?

• F24F 11/63 - Electronic processing

Abstract

Provided is, e.g., a management apparatus configured to manage multiple types of instruments at low cost. A management apparatus includes a first communication unit connected to an air-conditioner via a first instrument network (ka), a second communication unit connected to instruments including a monitoring camera, a door lock mechanism, and an illuminating apparatus via a second instrument network, a third communication unit connectable to an upper apparatus, and a control unit configured to control the air-conditioner or the instruments based on a combination of the state of the air-conditioner received via the first communication unit and the states of the instruments received via the second communication unit.

IPC Classes  ?

• G05B 19/042 - Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
• H04L 67/12 - Protocols specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks

Abstract

In some examples, a co-rotating scroll compressor includes a driver scroll having an axis aligned with the main axis and having a spiral involute, an idler scroll having an axis offset from the main axis and having a spiral involute intermeshed with the spiral involute of the driver scroll, and an Oldham coupling disposed between the driver scroll and idler scroll. The driver scroll may offset key slots so to engage with corresponding Oldham coupling keys. In another example, the Oldham coupling may offset driver scroll keys so to engage with corresponding key slots of the driver scroll.

IPC Classes  ?

• F01C 1/02 - Rotary-piston machines or engines of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
• F03C 2/00 - Rotary-piston engines
• F03C 4/00 - Oscillating-piston engines
• F04C 18/00 - Rotary-piston pumps specially adapted for elastic fluids
• F04C 18/02 - Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
• G11C 7/10 - Input/output [I/O] data interface arrangements, e.g. I/O data control circuits, I/O data buffers
• H01L 27/108 - Dynamic random access memory structures
• G11C 11/409 - Read-write [R-W] circuits
• G11C 7/22 - Read-write [R-W] timing or clocking circuits; Read-write [R-W] control signal generators or management
• F04C 29/00 - Component parts, details, or accessories, of pumps or pumping installations specially adapted for elastic fluids, not provided for in groups
• F01C 17/06 - Arrangements for drive of co-operating members, e.g. for rotary piston and casing using cranks, universal joints, or similar elements
• F04C 23/00 - Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids

Abstract

Provided is, e.g., a compressor with a high reliability. A compressor (100) includes a hermetic container (1) sealed with lubricant oil, an electric motor (6) placed inside the hermetic container (1) and having a stator (6a) and a rotor (6b), a crankshaft (3) configured to rotate integrally with the rotor (6b), a compression mechanism (2) configured to compress refrigerant in association with rotation of the crankshaft (3), a discharge pipe (Pb) configured to guide the refrigerant compressed in the compression mechanism (2) to the outside of the hermetic container (1), and a tubular oil ring (15) provided between the compression mechanism (2) and the electric motor (6). A cutout (s1) is, at a lower portion of the oil ring (15), provided as a first insertion portion into which the discharge pipe (Pb) is inserted.

IPC Classes  ?

• F04B 39/02 - Lubrication
• F04B 39/04 - Measures to avoid lubricant contaminating the pumped fluid
• F04C 18/02 - Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
• F04C 29/02 - Lubrication; Lubricant separation 

Abstract

A scroll compressor includes a hermetic container, a fixed scroll, a swing scroll, a frame, an electric motor, and a shaft. A first groove and a second groove are provided outside a fixed wrap in a radial direction at an end plate surface of the fixed scroll. An oil supply hole for guiding lubricant oil from a through-hole opens at an end plate surface of the swing scroll. A single opening of the oil supply hole alternately communicates with the first groove and the second groove along with swing of the swing scroll.

IPC Classes  ?

• F04C 18/02 - Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
• F04C 29/02 - Lubrication; Lubricant separation 
• F04C 23/00 - Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids

Abstract

A leakage sensing apparatus for sensing refrigerant leakage from an air-conditioner in an air-conditioned space air-conditioned by the air-conditioner includes a leakage sensing unit configured to sense the refrigerant leakage, a communication unit configured to transmit notification information indicating that the leakage has been sensed to an external apparatus via a communication network in a case where the leakage sensing unit has sensed the refrigerant leakage, and a power source unit configured to supply power to the leakage sensing apparatus independently of ON/OFF of a power supply to the air-conditioner.

IPC Classes  ?

• F24F 11/36 - Responding to malfunctions or emergencies to leakage of heat-exchange fluid
• F24F 11/58 - Remote control using Internet communication
• F24F 7/007 - Ventilation with forced flow
• F25B 49/02 - Arrangement or mounting of control or safety devices for compression type machines, plants or systems

Abstract

A refrigerant cycle of the present invention includes including an outdoor unit, a plurality of indoor units, and a controller for controlling the refrigeration cycle using at least one EEV. The controller comprises a velocity PID component executing a velocity PID control using pulse number for driving an EEV, three-state controller determining a driving state of the EEV and generating pulse commands designating the driving state, and a state machine driving the EEV depending on the pulse commands generated by the three-state controller.

IPC Classes  ?

• F24F 11/84 - Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
• F24F 3/06 - Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the arrangements for the supply of heat-exchange fluid for the subsequent treatment of primary air in the room units
• F25B 41/31 - Expansion valves
• G05B 11/42 - Automatic controllers electric with provision for obtaining particular characteristics, e.g. proportional, integral, differential for obtaining a characteristic which is both proportional and time-dependent, e.g. P. I., P. I. D.
• F25B 41/345 - Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators by solenoids

Abstract

A refrigeration cycle including at least one outdoor unit including a plurality of compressors and indoor units each placed in indoor spaces comprises a plurality of compressors for supplying refrigerant to indoor units; and a controller for controlling cooperatively a plurality of the compressors in the outdoor unit to provide a capacity for air-conditioning in the indoor spaces through the indoor units, wherein the controller controls operation of the compressors so as to minimize a cost including start/stop of each compressor by prediction of an air-conditioning requirement in a next time chunk.

IPC Classes  ?

• F25B 49/02 - Arrangement or mounting of control or safety devices for compression type machines, plants or systems
• F25B 7/00 - Compression machines, plants or systems, with cascade operation, i.e. with two or more circuits, the heat from the condenser of one circuit being absorbed by the evaporator of the next circuit

Abstract

In some examples, a scroll compressor may include an orbiting scroll and a fixed scroll having spiral involutes intermeshed together. A slider block may be disposed on the eccentric portion of a main shaft and the slider block may be attached to a compliant counterweight. The counterweight may be supported by a counterweight guide plate that is supported by the main shaft. The counterweight guide plate may also have an arm securing a top portion of the counterweight thereby securing the slider block. In some implementations, a spring assembly may be provided between an outer edge of the counterweight and the counterweight guide plate. These components may, in part, allow for a constant involute contact between the fixed scroll and orbiting scroll involutes at high speeds thereby achieving high compression efficiency.

IPC Classes  ?

• F04C 18/02 - Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
• F04C 29/00 - Component parts, details, or accessories, of pumps or pumping installations specially adapted for elastic fluids, not provided for in groups

Abstract

A distributor distributing refrigerant to multiple pipes including a tubular member including, at a side surface thereof, multiple insertion ports into which the multiple pipes are inserted and a supply port through which the refrigerant is supplied, a first closing member and a second closing member configured to close the tubular member at two spots positioned along a longitudinal direction of the tubular member, and a partition member extending from the first closing member to the second closing member and configured to divide an internal space of the tubular member into a space on an insertion port side and a space on a supply port side. The partition member includes two protruding portions contacting tip ends of the multiple pipes, and includes a refrigerant flow path between the two protruding portions on a first closing member side of one of the insertion ports closest to the first closing member.

IPC Classes  ?

• F28F 9/02 - Header boxes; End plates
• F28D 1/04 - Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or mo with the heat-exchange conduits immersed in the body of fluid with tubular conduits

Abstract

A refrigeration cycle, an air conditioning system, and a method for controlling a refrigeration cycle are provided. The refrigeration cycle includes an outdoor unit, an indoor unit, a controller, and an inverter. The controller controls a compressor and an outdoor fan of the air conditioning system so as to minimize a total electric power consumption of the air conditioning system. The inverter controls the outdoor fan in a rotation state predicted from a capacity demand in an air conditioning space depending on an operation mode and sensor values. The controller predicts the capacity demand and controls a rotation rate of the outdoor fan based on a prediction of the capacity demand.

IPC Classes  ?

• F24F 11/871 - Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling absorption or discharge of heat in outdoor units by controlling outdoor fans
• F24F 11/47 - Responding to energy costs
• F24F 3/044 - Systems in which all treatment is given in the central station, i.e. all-air systems
• F24F 11/64 - Electronic processing using pre-stored data
• F24F 140/60 - Energy consumption
• F24F 110/10 - Temperature

Abstract

An air conditioner controller for an air conditioner is configured to obtain a first value of a performance value from a predetermined component of the air conditioner, and estimate a total cost. The controller is configured to estimate the total cost including an operation cost and a renewal cost of the air conditioner based on the first value of the performance variable obtained from the predetermined component of the air conditioner and a second value of the performance variable estimated by an operational model of the air conditioner. The total cost is a total cost of operating and renewing the air conditioner for a time period after a time at which the first value of the performance variable is obtained. The controller is configured to output the total cost via a user interface.

IPC Classes  ?

• F24F 11/47 - Responding to energy costs
• F24F 11/63 - Electronic processing
• F24F 140/60 - Energy consumption

Abstract

A controller controls a first inverter drive circuit and a second inverter drive circuit. The first inverter drive circuit drives a load having a load current larger than the second inverter drive circuit. The first inverter drive circuit includes a control ground terminal and a drive ground terminal which are isolated from each other. The ground terminal of the second inverter drive circuit is connected to the ground of the controller. The control ground terminal of the first inverter drive circuit is connected to the ground of the controller. The drive ground terminal of the first inverter drive circuit is connected to the negative side of the first inverter circuit.

IPC Classes  ?

• H02M 7/493 - Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode the static converters being arranged for operation in parallel
• H02P 27/06 - Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
• H02P 29/024 - Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load
• F25B 49/02 - Arrangement or mounting of control or safety devices for compression type machines, plants or systems

Abstract

An air-conditioning device including multiple outdoor units and an indoor unit through a pipe includes a control section that obtains a degree of subcooling at an outlet of a subcooling circuit of each outdoor unit based on a temperature detected by a temperature sensor that detects the temperature of refrigerant having passed through the subcooling circuit of each outdoor unit, obtain a target value of the degree of subcooling based on the obtained multiple degrees of subcooling, and perform the control of increasing the rotation speed of a compressor of an outdoor unit having a higher degree of subcooling than the target value and decreasing the rotation speed of a compressor of an outdoor unit having a lower degree of subcooling than the target value such that a difference in the degree of subcooling at the outlet of the subcooling circuit of each outdoor unit is decreased.

IPC Classes  ?

• F25B 13/00 - Compression machines, plants or systems, with reversible cycle
• F25B 1/00 - Compression machines, plants or systems with non-reversible cycle

Abstract

An air-conditioner outdoor heat exchanger has a fin, multiple heat transfer pipes thermally connected to the fin, having a flat sectional shape, and configured such that refrigerant flows through header pipes connected to inlet and outlet sides of the heat transfer pipes. The refrigerant flows through the heat transfer pipes in parallel, and when the refrigerant returns from the outlet-side header pipe to the inlet-side header pipe through the heat transfer pipes, the refrigerant returns to the inlet-side header pipe through one of the heat transfer pipes adjacent to another one of the heat transfer pipes through which the refrigerant has flowed when flowing from the inlet-side header pipe to the outlet-side header pipe. At least two systems of refrigerant paths are formed, and the refrigerant flows back and forth in each system between the inlet-side header pipe and the outlet-side header pipe.

IPC Classes  ?

• F25B 39/02 - Evaporators
• F24F 1/18 - Heat exchangers specially adapted for separate outdoor units characterised by their shape
• F25B 39/00 - Evaporators; Condensers
• F28D 1/053 - Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or mo with the heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being straight
• F28F 9/02 - Header boxes; End plates

Abstract

Provided is an indoor unit of an air-conditioner including: an indoor unit body configured to be provided in a ceiling; a suction port attached to a lower surface of the indoor unit body; a panel including a blow port for blowing conditioned air into a room; and a louver provided at the blow port of the panel to change an air sending direction. The panel includes an outer frame provided outside the blow port and provided with a substantially horizontal flat portion, and a protruding portion provided on the flat portion of the outer frame and protruding vertically downward. A lower end of the protruding portion is positioned vertically above a lower end of the louver. A lower end of an inner flow path wall surface forming a flow path wall surface inside the blow port is positioned vertically below the lower end of the louver.

IPC Classes  ?

• F24F 1/0047 - Indoor units, e.g. fan coil units characterised by mounting arrangements mounted in the ceiling or at the ceiling
• F24F 13/30 - Arrangement or mounting of heat-exchangers
• F24F 13/20 - Casings or covers
• F04D 29/70 - Suction grids; Strainers; Dust separation; Cleaning

Abstract

A rolling cylinder displacement compressor including a minimum pressure bypass port as an opening of a minimum pressure bypass valve flow path, which is connected to a compression chamber formed in the compression portion in a lowest pressure state, of the bypass valve flow path is arranged such that a compression chamber faces an opening of the discharge flow path or the minimum pressure bypass port. The minimum pressure bypass port may be configured such that a minimum pressure port center as the center of the minimum pressure bypass port is arranged in a rotation advanced-side region with respect to an advanced radius line as a line connecting a cylinder advanced corner point of the compression chamber at the start of a compression stroke and the rotation center of the rolling cylinder.

IPC Classes  ?

• F04B 39/02 - Lubrication
• F04B 27/00 - Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders
• F16J 10/02 - Cylinders designed to receive moving pistons or plungers
• F04B 27/02 - Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders arranged oppositely relative to main shaft

Abstract

i indicates a molar fraction of each of the refrigerant components.

IPC Classes  ?

• C09K 5/04 - Materials undergoing a change of physical state when used the change of state being from liquid to vapour or vice-versa
• F25B 1/04 - Compression machines, plants or systems with non-reversible cycle with compressor of rotary type
• F25B 31/00 - Compressor arrangements

Abstract

An air conditioner is provided that reduces user discomfort due to vibrations and noises at a compressor, piping, and the like such as of an air conditioner. To achieve this, an air conditioner includes: a compressor (10) that has a motor (12) and a compression mechanism (14) driven by the motor (12); a speed detector (43) that detects a rotation speed of the motor (12); a drive mode controller (48) that controls a drive mode of the motor (12); and refrigerant piping that is connected to the compression mechanism (14) and allows a refrigerant to flow therethrough, wherein the drive mode controller (48), for stopping the motor (12), decelerates the motor (12) to a rotation speed equal to or lower than a resonance frequency between the compression mechanism (14) and the refrigerant piping.

IPC Classes  ?

• F25B 49/02 - Arrangement or mounting of control or safety devices for compression type machines, plants or systems
• F25B 31/02 - Compressor arrangements of motor-compressor units
• F24F 11/30 - Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring

Abstract

A heat exchanger including multiple fins, multiple heat transfer pipes having an oval shape or a flat shape and joined to the fins, and a header connected, on one end side, to an end portion of an inlet pipe through which working fluid flows in upon evaporation operation and connected, on the other end side, to an end portion of each of the heat transfer pipes, wherein the header includes a longitudinal partition plate arranged to extend in a longitudinal direction and configured to divide an internal space of the header into an inlet-pipe-side space connected to the end portion of the inlet pipe and a heat-transfer-pipe-side space connected to the end portion of each of the heat transfer pipes, and an opening is formed at a position not overlapping with the inlet pipe at the longitudinal partition plate.

IPC Classes  ?

• F28F 9/02 - Header boxes; End plates
• F25B 39/00 - Evaporators; Condensers
• F25B 13/00 - Compression machines, plants or systems, with reversible cycle
• F28F 1/32 - Tubular elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending transversely the means having portions engaging further tubular elements
• F28D 1/053 - Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or mo with the heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being straight
• F25B 39/02 - Evaporators

Abstract

An air-conditioner which performs an appropriate control in the event of a leak of refrigerant. The air-conditioner includes a refrigerant circuit, a refrigerant leak sensor which senses a leak of refrigerant in the refrigerant circuit, an indoor fan which delivers air to the indoor heat exchanger, and an indoor control circuit which, upon sensing a leak of refrigerant by the refrigerant leak sensor, controls the indoor fan based on whether the refrigerant sealed in the refrigerant circuit is flammable.

IPC Classes  ?

• F24F 11/36 - Responding to malfunctions or emergencies to leakage of heat-exchange fluid
• F24F 11/77 - Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity by controlling the speed of ventilators

Abstract

An air conditioner including an outdoor device that includes a bypass path connecting a discharge side of the compressor and a suction side of the compressor, an on-off valve configured to open/close the bypass path, and a control device configured to control the compressor, the decompression device, and the on-off valve. The control device opens the on-off valve in a state in which the compressor is stopped to execute such bypass opening that refrigerant circulates, through the bypass path, from the discharge side of the compressor in a refrigerant storage state in which refrigerant is stored to the suction side of the compressor in a substantially vacuum state, and evaluates a volume of the pipe.

IPC Classes  ?

• F25B 41/04 - Disposition of valves
• F25B 49/02 - Arrangement or mounting of control or safety devices for compression type machines, plants or systems
• F25B 13/00 - Compression machines, plants or systems, with reversible cycle

Abstract

A heat exchanger is provided which has: multiple flat heat transfer pipes configured such that refrigerant for heat exchange with air flowing inside; and a fin having a heat exchange surface between adjacent ones of the heat transfer pipes, wherein the multiple heat transfer pipes are arranged such that flat portions of the heat transfer pipes face each other, the fin has one end and other end in an air flow direction, and a first rib formed vertically above the flat portion, and the first rib has an extension portion extending along the flat portion, and an enlarged portion configured such that a distance to the flat portion gradually increases from the extension portion in a direction of one end side.

IPC Classes  ?

• F25B 39/02 - Evaporators
• F28F 1/12 - Tubular elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
• F28F 1/04 - Tubular elements of cross-section which is non-circular polygonal, e.g. rectangular
• F25B 13/00 - Compression machines, plants or systems, with reversible cycle

Abstract

A screw rotor lead correction calculation device includes an initial data input section configured to input an error as a distance with respect to a reference lead at each axial position of a rotor groove portion of a screw rotor, and a processing machine input correction amount/position output section configured to compute and output, based on the error as the distance input to the initial data input section, a lead correction amount with respect to the reference lead and a lead correction starting position as an axial position for starting lead correction. With this configuration, correction data for obtaining a screw rotor with a high-accuracy lead can be obtained from a lead error with respect to a reference lead in a screw rotor obtained by ground finish of the material of the screw rotor.

IPC Classes  ?

• B24B 49/04 - Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation according to the instantaneous size and required size of the workpiece acted upon, the measuring or gauging being continuous or intermittent involving measurement of the workpiece at the place of grinding during grinding operation
• B24B 5/16 - Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor involving centres or chucks for holding work for grinding peculiarly profiled surfaces, e.g. bulged
• F04C 29/06 - Silencing
• F04C 18/16 - Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
• F04C 2/00 - Rotary-piston machines or pumps

Abstract

d of the compressor 4; a pipe 27 that has one end connected to the pipe 25 and an opposite end connected to the pipe 21; and a second solenoid valve 13 for opening and closing a fluid passage of the pipe 27.

IPC Classes  ?

• F25B 49/02 - Arrangement or mounting of control or safety devices for compression type machines, plants or systems
• F25B 41/00 - Fluid-circulation arrangements
• F25B 41/40 - Fluid line arrangements
• F25B 1/04 - Compression machines, plants or systems with non-reversible cycle with compressor of rotary type
• F25B 13/00 - Compression machines, plants or systems, with reversible cycle

Abstract

Provided is a heat exchanger which includes: multiple heat transfer pipes in which refrigerant flows; and a corrugated fin joined to the heat transfer pipes; and multiple plate-shaped fins. The plate-shaped fins are joined to at least one of each heat transfer pipe or the corrugated fin, and are arranged on a windward side in an air blowing direction with respect to the corrugated fin such that a plate width direction of each plate-shaped fin is substantially coincident with a plate width direction of the corrugated fin.

IPC Classes  ?

• F28F 1/12 - Tubular elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
• F28D 7/00 - Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
• F25B 13/00 - Compression machines, plants or systems, with reversible cycle
• B23P 15/26 - Making specific metal objects by operations not covered by a single other subclass or a group in this subclass heat exchangers

Abstract

A rotary compressor that may include an upper or outboard bearing above the motor components and, in this case, includes an upper bearing plate having a structure that ensures bearing alignment when press fit with an upper cap and a center shell. In some implementations, a main bearing frame that secures and holds a main bearing has a structure that when press fit with a lower cap and center shell ensure bearing alignment. Some implementations include disposing a hermetic terminal and a discharge port a the side of the upper cap or center shell.

IPC Classes  ?

• F03C 2/00 - Rotary-piston engines
• F03C 4/00 - Oscillating-piston engines
• F04C 11/00 - Combinations of two or more machines or pumps, each being of rotary-piston or oscillating-piston type; Pumping installations
• F04C 2/00 - Rotary-piston machines or pumps
• F04C 23/00 - Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
• F04C 23/02 - Pumps characterised by combination with, or adaptation to, specific driving engines or motors
• F04C 29/06 - Silencing
• F01C 21/10 - Outer members for co-operation with rotary pistons; Casings
• F01C 21/02 - Arrangements of bearings
• F04C 18/356 - Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups , , , , , or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group or and relative reciprocation between the co-operating members with vanes reciprocating with respect to the outer member
• F04C 27/00 - Sealing arrangements in rotary-piston pumps specially adapted for elastic fluids

Abstract

An air conditioner provided which has: a main refrigerant circuit including a compressor, a heat source side heat exchanger, a first expansion valve, and a utilization side heat exchanger and configured such that refrigerant flows in the main refrigerant circuit; a sub refrigerant circuit including a cooling member configured such that refrigerant branched from the main refrigerant circuit flows in the cooling member and configured such that refrigerant branched from the main refrigerant circuit flows in the sub refrigerant circuit; and a heat generator to be cooled by the cooling member, wherein a pipe in which part of refrigerant discharged from the compressor flows is connected to the cooling member of the sub refrigerant circuit.

IPC Classes  ?

• F24F 1/24 - Cooling of electric components
• F25B 49/02 - Arrangement or mounting of control or safety devices for compression type machines, plants or systems
• F25B 1/00 - Compression machines, plants or systems with non-reversible cycle
• F25B 41/00 - Fluid-circulation arrangements
• F25B 41/30 - Expansion means; Dispositions thereof
• F25B 41/31 - Expansion valves
• F25B 41/40 - Fluid line arrangements

Abstract

An air conditioning system provided which has: an outdoor device including at least a compressor and a first heat exchanger; an air handling device including an air supply fan and a second heat exchanger; an expansion valve; and a control section, wherein the compressor, the first heat exchanger, the expansion valve, and the second heat exchanger are sequentially connected in an annular shape to form a refrigerant circuit in which refrigerant circulates, and the control section adjusts a rotation speed of the air supply fan and/or a degree of opening of the expansion valve based on information including a temperature detection value of refrigerant on each of one end side and the other end side of the second heat exchanger, a temperature detection value of air toward the second heat exchanger, and a temperature detection value of air heat-exchanged by the second heat exchanger.

IPC Classes  ?

• F24F 11/77 - Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity by controlling the speed of ventilators
• F24F 11/84 - Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
• F24F 11/86 - Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
• F24F 11/52 - Indication arrangements, e.g. displays
• F25B 49/02 - Arrangement or mounting of control or safety devices for compression type machines, plants or systems
• F24F 3/044 - Systems in which all treatment is given in the central station, i.e. all-air systems
• F24F 11/36 - Responding to malfunctions or emergencies to leakage of heat-exchange fluid
• F24F 11/74 - Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
• F25B 13/00 - Compression machines, plants or systems, with reversible cycle
• F25B 40/02 - Subcoolers
• F24F 11/64 - Electronic processing using pre-stored data
• F24F 140/20 - Heat-exchange fluid temperature

Abstract

An collective device for switching refrigerant flow arranged between an indoor device and an outdoor device is provided; which includes multiple high-pressure valves; multiple low-pressure valves; a high-pressure header; a low-pressure header; a high-pressure gas pipe connecting each high-pressure valve and the high-pressure header; and a low-pressure gas pipe connecting each low-pressure valve and the low-pressure header, wherein the multiple high-pressure valves are arranged next to each other in a first direction perpendicular to a vertical direction, the multiple low-pressure valves are arranged next to each other in the first direction, and the low-pressure valves, the low-pressure header, and the low-pressure gas pipe are arranged on one side in a second direction perpendicular to the vertical direction and the first direction with respect to the high-pressure valves, the high-pressure header, and the high-pressure gas pipe.

IPC Classes  ?

• F25B 41/04 - Disposition of valves
• F24F 1/20 - Electric components for separate outdoor units
• F24F 1/30 - Refrigerant piping for use inside the separate outdoor units
• F25B 13/00 - Compression machines, plants or systems, with reversible cycle

Abstract

In order to achieve a power conversion device with which a motor can be stably driven, a power conversion device is provided with: an inverter, which converts supplied DC voltage to an AC output voltage and supplies the AC output voltage to windings, and which, in accordance with the DC voltage, changes the saturation level at which the output voltage is saturated, in order to drive a motor equipped with a stator having the windings and a rotor having permanent magnets; and a controller which, when the output voltage is lower than the saturation level, increases the output current of the inverter such that a magnetic flux that weakens or strengthens the magnetic flux generated by the permanent magnets is generated in the windings. An air conditioner including the power conversion device is also disclosed.

IPC Classes  ?

• H02P 27/12 - Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation pulsing by guiding the flux vector, current vector or voltage vector on a circle or a closed curve, e.g. for direct torque control
• H02P 21/00 - Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
• F24F 11/86 - Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
• H02P 21/22 - Current control, e.g. using a current control loop
• H02M 7/48 - Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode

Abstract

A scroll compressor has: a revolving scroll; a fixed scroll; a compression chamber that is defined by the revolving scroll and the fixed scroll to compress a working fluid; a suction chamber that is defined by the revolving scroll and the fixed scroll to suck the compressed working fluid; an electric motor that drives the revolving scroll; a bypass mechanism that communicates or shuts off between the compression chamber and the suction chamber; and a sealed vessel, wherein the bypass mechanism has: a bypass port that is formed in the fixed scroll and communicates between the compression chamber and the suction chamber; and a bypass valve that opens and closes the bypass port, and wherein a groove is formed in the revolving lap to communicate between the bypass port and a suction pressure space when the bypass port is open.

IPC Classes  ?

• F04C 29/12 - Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet
• F04C 29/00 - Component parts, details, or accessories, of pumps or pumping installations specially adapted for elastic fluids, not provided for in groups
• F04C 18/02 - Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents

Abstract

An electric compressor is provided which has: in a sealed container, a compression mechanism to compress a refrigerant and an electric motor to drive the compression mechanism, wherein the refrigerant contains 20% by mass or more of hydrofluoroolefin, and a refrigerator oil stored in the sealed container contains; polyvinyl ether as a base oil; an alicyclic epoxy compound in an amount of 0.1% by mass or more and 2.0% by mass or less relative to the base oil; an aliphatic epoxy compound in an amount of 0.1% by mass or more and 2.0% by mass or less relative to the base oil; and tertiary phosphate in an amount of 0.1% by mass or more and 2.0% by mass or less relative to the base oil.

IPC Classes  ?

• F04B 39/02 - Lubrication
• C09K 5/04 - Materials undergoing a change of physical state when used the change of state being from liquid to vapour or vice-versa
• F04C 29/04 - Heating; Cooling; Heat insulation
• F04C 29/02 - Lubrication; Lubricant separation 
• C10M 107/24 - Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing monomers having an unsaturated radical bound to an alcohol, aldehydo, ketonic, ether, ketal or acetal radical
• C10M 129/18 - Epoxides
• C10M 137/04 - Phosphate esters
• F25B 1/04 - Compression machines, plants or systems with non-reversible cycle with compressor of rotary type
• C10M 171/00 - Lubricating compositions characterised by purely physical criteria, e.g. containing as base-material, thickener or additive, ingredients which are characterised exclusively by their numerically specified physical properties, i.e. containing ingredien
• F04C 18/02 - Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
• F04B 39/00 - Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups
• F04B 35/04 - Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being electric
• C10M 129/72 - Esters of polycarboxylic acids

Abstract

A boosting operation of a converter and the intermittent energization operation of an inverter are optimally performed in accordant with input or output. The power converter includes the converter capable of boosting a DC voltage outputted by switching operation alternately performing shorting and rectification; the inverter; an inverter capable of performing intermittent energization in which switching around zero cross of a motor current is turned off upon converting the DC voltage outputted by the converter into three-phase AC power; and a controller that controls the converter to perform boosting operation and the inverter to perform the boosting operation of the converter and the intermittent energization operation of the inverter linkingly.

IPC Classes  ?

• H02M 1/42 - Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
• H02M 1/00 - APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF - Details of apparatus for conversion
• H02M 1/36 - Means for starting or stopping converters
• H02P 27/08 - Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation
• H02P 5/74 - Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors controlling two or more ac dynamo-electric motors
• H02M 5/458 - Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
• H02M 7/219 - Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a bridge configuration

Abstract

A refrigerant flow path switch arranged between an outdoor device and each of multiple indoor devices controls a refrigerant flow and is provided with a housing; a refrigerant flow path switching circuit having multiple refrigerant flow path switching circuits, wherein each refrigerant flow path switching circuit includes a high/low pressure gas pipe, a low pressure gas pipe, a high/low pressure electric valve provided at the high/low pressure gas pipe, and a low pressure electric valve provided at the low pressure gas pipe. A liquid pipe assembly is arranged in the housing and has multiple liquid pipes connected to the multiple indoor devices. A first divider plate is provided between adjacent ones of the refrigerant flow path switching circuits and divides an internal space of the housing such that a space divided by the first divider plate is in a substantially cubic shape, which is filled with a foaming agent.

IPC Classes  ?

• F25B 47/00 - Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
• F25B 41/04 - Disposition of valves
• F25B 13/00 - Compression machines, plants or systems, with reversible cycle
• F25B 41/00 - Fluid-circulation arrangements
• F25B 49/02 - Arrangement or mounting of control or safety devices for compression type machines, plants or systems

Abstract

Provided is an outdoor unit for an air conditioner and the like that provide notification of whether maintenance is needed for an outdoor heat exchange unit in appropriate timing. The outdoor unit for the air conditioner includes: a compressor; an outdoor heat exchange unit through which a refrigerant flows by driving of the compressor; an outdoor fan that includes an outdoor fan motor and is installed near the outdoor heat exchange unit; and a control unit that provides notification of whether maintenance is needed for the outdoor heat exchange unit based on an airflow resistance during an outdoor air-sending operation in which the outdoor fan is driven to send outdoor air into the outdoor heat exchange unit while the compressor is stopped. This makes it possible to provide the notification of whether the maintenance is needed for the outdoor heat exchange unit in appropriate timing.

IPC Classes  ?

• F25B 47/02 - Defrosting cycles
• F24F 11/38 - Failure diagnosis
• F24F 11/42 - Defrosting; Preventing freezing of outdoor units
• F24F 11/32 - Responding to malfunctions or emergencies
• F24F 11/52 - Indication arrangements, e.g. displays
• F24F 11/62 - Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
• F24F 11/54 - Control or safety arrangements characterised by user interfaces or communication using one central controller connected to several sub-controllers
• F24F 1/06 - Separate outdoor units, e.g. outdoor unit to be linked to a separate room unit comprising a compressor and a heat exchanger
• F24F 1/38 - Fan details of outdoor units, e.g. bell-mouth shaped inlets or fan mountings

Abstract

A motor drive that enables the elimination of distortion of a motor current caused by direct current voltage ripples with the use of a smoothing capacitor having a small capacity and refrigeration equipment. A motor drive includes a rectifier circuit, a smoothing capacitor, voltage detector, an inverter circuit, current sensor, and a controller configured to control the inverter circuit. The controller has a voltage controller configured to generate a voltage command value used for controlling the motor, a ripple frequency arithmetic unit configured to operate a ripple frequency included in the direct current voltage signal, and a harmonic suppressor configured to process a signal based on the direct current signal using an S controller having a gain near the ripple frequency and output a corrected amount. The inverter circuit is controlled based on a signal that the voltage command value is corrected using the corrected amount.

IPC Classes  ?

• H02P 21/05 - Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation specially adapted for damping motor oscillations, e.g. for reducing hunting
• H02P 21/18 - Estimation of position or speed
• H02P 21/22 - Current control, e.g. using a current control loop
• F25B 31/02 - Compressor arrangements of motor-compressor units
• H02M 7/5387 - Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
• H02P 27/12 - Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation pulsing by guiding the flux vector, current vector or voltage vector on a circle or a closed curve, e.g. for direct torque control
• H02M 1/14 - Arrangements for reducing ripples from dc input or output
• H02M 7/48 - Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
• H02M 1/12 - Arrangements for reducing harmonics from ac input or output
• H02M 7/5395 - Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency by pulse-width modulation
• H02M 1/00 - APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF - Details of apparatus for conversion

Abstract

In order to enable a drain pan to be visually checked for contamination without requiring a complicated operation, the present invention is configured so as to be equipped with: a housing; a drain pan provided inside the housing; a drain pump for pumping up drain water accumulated in the drain pan; an opening provided in a side surface of the housing; and a cover member attached to the opening and covering the opening. When the cover member is detached from the opening at least a portion of the drain pan can be viewed from the opening.

IPC Classes  ?

• F24F 13/22 - Means for preventing condensation or evacuating condensate
• F24F 13/20 - Casings or covers

Abstract

The present invention provides an outdoor unit for an air conditioner that can be constructed at low cost while reducing risk of malfunction. The outdoor unit has a compressor; a fan motor; a compressor driver board having a compressor inverter circuit and a compressor driver circuit; and a fan driver board having a fan inverter circuit and fan driver circuit. The compressor driver board has at least either: a shared control circuit that feeds a first switching signal for a compressor to the compressor driver circuit and feeds a second switching signal for a fan to the fan driver circuit; or a shared power source circuit that steps down a first DC voltage to a second DC voltage and supplies the second DC voltage to the compressor driver circuit and to the fan driver circuit.

IPC Classes  ?

• F24F 1/22 - Arrangement or mounting thereof
• F24F 11/89 - Arrangement or mounting of control or safety devices
• F24F 11/88 - Electrical aspects, e.g. circuits

Abstract

To predict and detect a failure in a compressor provided in an air conditioner, the air conditioner is provided with: a heat exchanger; the compressor; piping connecting the heat exchanger and the compressor with each other; and a control unit controlling the compressor and having a compressor failure predicting and detecting means, and in this air conditioner, the compressor failure predicting and detecting means of the control unit includes: a current detecting part detecting a driving current driving the compressor; a pulsation detecting part detecting pulsation in a driving current detected by the current detecting part; and an anomaly determining part predicting or detecting any failure in the compressor based on a magnitude and a duration of pulsation in a driving current detected by the pulsation detecting part.

IPC Classes  ?

• F25B 49/02 - Arrangement or mounting of control or safety devices for compression type machines, plants or systems
• F04B 49/10 - Other safety measures
• F04B 35/04 - Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being electric
• F25B 49/00 - Arrangement or mounting of control or safety devices
• F25B 13/00 - Compression machines, plants or systems, with reversible cycle
• F04B 49/06 - Control using electricity
• F04C 23/00 - Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
• F04C 28/28 - Safety arrangements; Monitoring
• F04C 18/02 - Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents

Abstract

An air conditioner is provided, which is capable of accurately determining appropriateness of a refrigerant amount in a refrigerating cycle. A control apparatus is configured to: stop a cooling operation; set an expansion valve to a fully-closed state and, at the same time, switch the selector valve to change the direction, in which a refrigerant flows, to an opposite direction; operate a compressor to perform a refrigerant recovery operation, in which a refrigerant contained in an outdoor heat exchanger is recovered by an indoor heat exchanger; and determine the appropriateness of a refrigerant amount in a refrigerating cycle, based on at least one of a time required for recovering the refrigerant, a pressure change in a refrigerant suctioned by the compressor, and temperature of the refrigerant discharged from the compressor during the refrigerant recovery operation.

IPC Classes  ?

• F25B 13/00 - Compression machines, plants or systems, with reversible cycle
• F25B 17/06 - Sorption machines, plants or systems, operating intermittently, e.g. absorption or adsorption type the absorbent or adsorbent being a liquid, e.g. brine with the boiler and evaporator built-up as a unit in a tiltable or revolving arrangement
• F25B 49/02 - Arrangement or mounting of control or safety devices for compression type machines, plants or systems
• F25D 17/06 - Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating gas, e.g. by natural convection by forced circulation
• F24F 11/30 - Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring

Abstract

A centering process and fastening bolt are not required for assembling a fixed scroll and an orbiting scroll of a scroll compressor that includes a hermetically sealed container and a compression mechanism. The fixed scroll includes a cylindrical portion formed in a circumferential direction on an outer circumferential side of the fixed wrap, a flange provided in the circumferential direction further outside of the cylindrical portion, and a first hole provided in the flange in an axial direction. The frame includes an inner circumferential surface, a flange provided in the circumferential direction further outside of the inner circumferential surface, and a second hole in the axial direction which is provided in a position of the flange opposite to the first hole. A knock pin is inserted in the first and second holes to prevent the frame and the fixed scroll from being displaced in the rotational direction.

IPC Classes  ?

• F04C 18/02 - Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
• F04C 23/00 - Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids

Abstract

A scroll compressor includes a fixed scroll, an orbiting scroll, a suction section, a discharge section, and an electric motor. A sliding surface of a scroll is formed outside a wrap with a depression section depressed with respect to a sliding surface and a flange section elevated with respect to the depression section. The flange section is a remaining region in a protruding region disposed outside a referential perfect circle, the remaining region being other than a region continuing to an end of an involute curve of a scroll formed with the flange section, the referential perfect circle having a radius set to a distance between the center of the scroll formed with the flange section and the end of the involute curve. The scroll compressor enhances reduction of the sliding loss with a simple structure and reduction of the refrigerant leakage loss in the entire compression chambers.

IPC Classes  ?

• F04C 18/02 - Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
• F04C 29/02 - Lubrication; Lubricant separation 

Abstract

An air conditioner that includes a heat exchanger including: heat-transfer pipes extending in a horizontal direction and spaced apart at predetermined intervals in a vertical direction and configured to allow a thermal medium to flow therein. A part of the heat transfer pipes are used for at least one inflow path into which the thermal medium flows from the outside of the heat exchanger and the other part of the heat transfer pipes are used for at least one outflow path from which the thermal medium flows out to the outside. At least one connection pipe through which an outlet side of one of the at least one inflow path communicates with an inlet side of one of the at least one outflow path.

IPC Classes  ?

• F28D 1/053 - Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or mo with the heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being straight
• F28F 1/02 - Tubular elements of cross-section which is non-circular
• F28F 1/42 - Tubular elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being both outside and inside the tubular element
• F28F 9/02 - Header boxes; End plates
• F25B 39/00 - Evaporators; Condensers
• F28D 1/04 - Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or mo with the heat-exchange conduits immersed in the body of fluid with tubular conduits
• F28F 1/32 - Tubular elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending transversely the means having portions engaging further tubular elements
• F28F 1/04 - Tubular elements of cross-section which is non-circular polygonal, e.g. rectangular
• F28F 23/00 - Features relating to the use of intermediate heat-exchange materials, e.g. selection of compositions
• F28D 1/02 - Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or mo with the heat-exchange conduits immersed in the body of fluid
• F24F 13/30 - Arrangement or mounting of heat-exchangers
• F24F 11/89 - Arrangement or mounting of control or safety devices

Abstract

c) of a lower surface of the foot portion. The refrigeration and air conditioning device increases rigidity without increasing costs.

IPC Classes  ?

• F24F 1/00 - Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
• F24F 1/50 - Component arrangements in separate outdoor units characterised by airflow, e.g. inlet or outlet airflow with outlet air in upward direction
• F24F 5/00 - Air-conditioning systems or apparatus not covered by group or
• F24F 13/20 - Casings or covers
• F24F 13/24 - Means for preventing or suppressing noise
• F24F 13/32 - Supports for air-conditioning, air-humidification or ventilation units

Abstract

An outdoor unit of an air conditioner is provided that improves work efficiency at the time of installation and maintenance of the outdoor unit and prevents a cover for covering an opening from being unintentionally left open. The outdoor unit of the air conditioner includes an electrical box, a housing that covers the electrical box to form an contour, an electrical box cover member that covers components inside the electrical box, a housing cover that covers the electrical box cover member from outside, wherein the electrical box cover member has a work opening and has an opening cover that covers the work opening mounted thereon, and in which the housing cover abuts on the opening cover in a state of the opening cover being open.

IPC Classes  ?

• H02G 3/08 - Distribution boxes; Connection or junction boxes
• F24F 1/56 - Casing or covers of separate outdoor units, e.g. fan guards
• F24F 1/22 - Arrangement or mounting thereof

Abstract

A heat exchanger includes: a gas-side port connected to piping for a gaseous refrigerant; a liquid-side port connected to piping for a liquid refrigerant; a refrigerant path that links the gas-side port to the liquid-side port; at least four heat exchange part regions that perform heat exchange between air and the refrigerant flowing through the refrigerant path; and a branching and merging part that branches and merges the refrigerant path to connect the heat exchange part regions in series between the gas-side port and the liquid-side port through the refrigerant path. The heat exchange part regions are connected to each other through the branching and merging part so as to allow the number of refrigerant paths provided in the heat exchange part region near the gas-side port to be greater than the number of refrigerant paths provided in the heat exchange part region near the liquid-side port.

IPC Classes  ?

• F28D 1/04 - Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or mo with the heat-exchange conduits immersed in the body of fluid with tubular conduits
• F25B 39/00 - Evaporators; Condensers
• F28D 1/047 - Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or mo with the heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being bent, e.g. in a serpentine or zig-zag
• F28F 9/26 - Arrangements for connecting different sections of heat-exchange elements, e.g. of radiators
• F28D 21/00 - Heat-exchange apparatus not covered by any of the groups
• F28F 1/32 - Tubular elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending transversely the means having portions engaging further tubular elements
• F25B 39/04 - Condensers

Abstract

Provided is a air conditioner including high-and-low-pressure gas pipe expansion valves each of which is provided to a corresponding one of the cooling-heating switching units and adjusts feeding of high-temperature and high-pressure gas refrigerant to the corresponding indoor unit; and a refrigeration cycle controller which adjusts a valve opening degree of the high-and-low-pressure gas pipe expansion valve of the cooling-heating switching unit connected to one of the indoor units which is not in heating operation, in accordance with a determination result on excess or deficiency of refrigerant in a refrigeration cycle.

IPC Classes  ?

• F25B 13/00 - Compression machines, plants or systems, with reversible cycle
• F25B 41/06 - Flow restrictors, e.g. capillary tubes; Disposition thereof
• F25B 49/02 - Arrangement or mounting of control or safety devices for compression type machines, plants or systems

Abstract

An outdoor unit (100, 110), comprising a housing (1, 20) having fans (2) provided thereon and a compressor (4) and heat exchanger (3-1, 3-2, 23-1, 23-2) disposed on a base (10, 210) thereof; a left-right pair of side covers (8, 28, 9, 29) each being bent and having two surfaces, one surface covering a portion of a side of housing (1, 20), and the other surface covering a portion of the front of the housing (1, 20); a controller housing (7) fixed to the upper section of the surface of at least one side cover (8, 28, 9, 29), of said left-right pair of said covers (8, 28, 9, 29), that covers a portion of the front of the housing (1, 20), said controller housing (7) being fixed at a height allowing the compressor (4) to be moved into and out of the housing unobstructed.

IPC Classes  ?

• F24F 1/22 - Arrangement or mounting thereof
• F24F 1/56 - Casing or covers of separate outdoor units, e.g. fan guards

Abstract

An outdoor unit for an air conditioner, and an air conditioner are provided that allow for effectively cooling a cooled part such as a power element, even when a refrigerant is not circulated, to prevent the part from being damaged by generated heat. Said outdoor unit and said air conditioner each include: a casing; a heat exchanger that exchanges heat between a refrigerant flowing therein and air; a blower fan that sucks air outside the casing and forces the air to pass through the heat exchanger; an electric parts box that has a board and a part to be cooled; and a cooling member that is thermally connected with said part and cools it with a refrigerant flowing therein, wherein the cooling member is arranged on an outer wall surface of the electric parts box in a path of the air blown by the blower fan.

IPC Classes  ?

• F24F 1/24 - Cooling of electric components
• F24F 1/22 - Arrangement or mounting thereof
• F24F 1/50 - Component arrangements in separate outdoor units characterised by airflow, e.g. inlet or outlet airflow with outlet air in upward direction
• F24F 1/26 - Refrigerant piping
• H05K 7/20 - Modifications to facilitate cooling, ventilating, or heating

Abstract

An indoor unit of an air conditioner includes a guide member provided below an air discharge port of a blower fan and upstream of the heat exchanger. The guide member has a guide portion disposed to face an end surface upstream of the heat exchanger, and the guide portion is a plate body whose cross-section has a linear shape parallel to the end surface when cut along a plane including a rotation axis of the blower fan. Thus, provided is the indoor unit of the air conditioner capable of more uniformly guiding air from the blower fan in a height direction of the heat exchanger by the compact and inexpensive guide member.

IPC Classes  ?

• F24F 13/08 - Air-flow control members, e.g. louvres, grilles, flaps or guide plates
• F24F 1/0047 - Indoor units, e.g. fan coil units characterised by mounting arrangements mounted in the ceiling or at the ceiling
• F24F 1/0022 - Centrifugal or radial fans
• F24F 1/0059 - Indoor units, e.g. fan coil units characterised by heat exchangers
• F24F 13/02 - Ducting arrangements
• F24F 1/0007 - Indoor units, e.g. fan coil units

Abstract

An inverter, motor drive device and freezing device, with which it is possible to effectively suppress current beats in the event of over-modulation without requiring additional circuits. This motor driving device includes: a rectifier circuit that converts the AC voltage from an AC power supply into a DC voltage; a smoothing capacitor that smoothes the DC voltage output from the rectifier circuit; an inverter circuit that converts the DC voltage output from the smoothing capacitor into an AC voltage; and a controller that reduces the current beat component by estimating, using a phase locked loop process, the frequency, phase and amplitude of the current beat component in the output current of the inverter circuit, and corrects the voltage command to the inverter circuit on the basis of the estimated frequency, phase and amplitude.

IPC Classes  ?

• H02P 27/08 - Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation
• H02P 21/00 - Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
• H02P 6/06 - Arrangements for speed regulation of a single motor wherein the motor speed is measured and compared with a given physical value so as to adjust the motor speed
• H02P 6/185 - Circuit arrangements for detecting position without separate position detecting elements using inductance sensing, e.g. pulse excitation
• H02P 27/04 - Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
• H02P 27/12 - Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation pulsing by guiding the flux vector, current vector or voltage vector on a circle or a closed curve, e.g. for direct torque control

Abstract

An air conditioner which includes a compressor, an outdoor heat exchanger, an outdoor expansion valve, and an indoor heat exchanger that have been successively connected by a pipeline, and in which a hydrofluoroolefin-containing refrigerant is to be used, the air conditioner being characterized in that an oxygen adsorption device in which a synthetic zeolite is used as an adsorbent has been disposed somewhere in the pipeline, the synthetic zeolite having a pore diameter which is larger than the size of the oxygen molecule but smaller than the size of the hydrofluoroolefin molecule.

IPC Classes  ?

• F25B 1/00 - Compression machines, plants or systems with non-reversible cycle
• F25B 13/00 - Compression machines, plants or systems, with reversible cycle
• F25B 43/04 - Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat for withdrawing non-condensible gases

Abstract

A scroll compressor is provided which includes: a revolving scroll, a fixed scroll, an autorotation preventing mechanism, a frame, a crank shaft provided with an eccentric pin portion which is eccentric with respect to an axis, the crank shaft being provided with a flange portion at a lower portion of the eccentric pin portion, the flange portion being larger than the diameter of the eccentric pin portion, a balance weight mounted on the flange portion, a sealing member performing sealing between the revolving scroll and the flange portion, and a thrust bearing arranged between the frame and the flange portion. The scroll compressor reduces the amount of oil flowing into a back pressure chamber, thereby improving the performance of the scroll compressor.

IPC Classes  ?

• F04C 27/00 - Sealing arrangements in rotary-piston pumps specially adapted for elastic fluids
• F04C 18/02 - Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
• F01C 21/02 - Arrangements of bearings
• F01C 21/10 - Outer members for co-operation with rotary pistons; Casings
• F04C 29/02 - Lubrication; Lubricant separation 

Abstract

The air conditioner has a configuration such that, in an air-warming operation: the average refrigerant exit temperature, which is obtained by averaging the temperature of the refrigerant exits of indoor heat exchangers 7 in a plurality of indoor units 10, as detected by heat-exchanger-refrigerant-exit temperature probes 34 in the indoor units 10, is determined; the temperature difference between the average refrigerant exit temperature and the refrigerant exit temperatures of the indoor heat exchangers 7 of each of the indoor units 10 is determined; and the degree to which indoor expansion valves 9 of the indoor units 10 are open is controlled such that the determined temperature difference falls within a predetermined temperature difference range.

IPC Classes  ?

• F25B 6/02 - Compression machines, plants or systems, with several condenser circuits arranged in parallel
• F24F 11/62 - Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
• F24F 11/80 - Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
• F24F 11/89 - Arrangement or mounting of control or safety devices
• F25B 13/00 - Compression machines, plants or systems, with reversible cycle
• F25B 49/02 - Arrangement or mounting of control or safety devices for compression type machines, plants or systems
• G05D 23/19 - Control of temperature characterised by the use of electric means
• G05D 23/24 - Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature the sensing element having a resistance varying with temperature, e.g. thermistor
• F24F 140/20 - Heat-exchange fluid temperature
• F24F 110/10 - Temperature
• F24F 1/26 - Refrigerant piping

Abstract

An air conditioner capable of detecting resonance of a casing of an outdoor or indoor unit of an air conditioner at a low cost with high accuracy is provided. An outdoor unit of the air conditioner includes: a propeller fan that blows air to a heat exchanger; a fan motor that drives the propeller fan; a current detector that detects a current value of the fan motor; a phase detector that detects the magnetic pole position of the fan motor; a fan rotation speed detector that detects the rotation speed of the fan motor; a pulsation detector that detects pulsation of the current value; and a resonance determiner that determines resonance of a system of a casing of the outdoor unit having the fan motor. If the resonance determiner determines resonance, a controller executes resonance avoidance control for increasing or decreasing the fan rotation speed by a predetermined rotation speed.

IPC Classes  ?

• F24F 1/14 - Heat exchangers specially adapted for separate outdoor units
• F24F 1/38 - Fan details of outdoor units, e.g. bell-mouth shaped inlets or fan mountings
• F24F 1/40 - Vibration or noise prevention at outdoor units
• F25B 49/02 - Arrangement or mounting of control or safety devices for compression type machines, plants or systems
• F24F 13/24 - Means for preventing or suppressing noise
• F24F 11/89 - Arrangement or mounting of control or safety devices
• F24F 11/74 - Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
• H02M 1/00 - APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF - Details of apparatus for conversion
• H02P 6/18 - Circuit arrangements for detecting position without separate position detecting elements
• F24F 130/40 - Noise

Abstract

A refrigerant compressor includes a compression mechanism portion, a drive portion, a crankshaft, a main bearing and an auxiliary bearing that support the crankshaft, and a sealed container that accommodates therein the compression mechanism portion, the drive portion, the crankshaft, the main bearing, and the auxiliary bearing. The auxiliary bearing is configured of an antifriction bearing and provided in an auxiliary bearing housing attached to the sealed container. The auxiliary bearing housing includes an opening for inserting the auxiliary bearing on the drive portion side, and includes a housing cover covering the opening. An insulating sleeve configured of an insulating material is provided between the crankshaft and the auxiliary bearing. The insulating sleeve includes a cylinder portion located between the crankshaft and the auxiliary bearing, and a flange portion located between the auxiliary bearing and the housing cover and extended in an outer diameter direction.

IPC Classes  ?

• F04C 18/02 - Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
• F04C 27/00 - Sealing arrangements in rotary-piston pumps specially adapted for elastic fluids
• F04C 29/00 - Component parts, details, or accessories, of pumps or pumping installations specially adapted for elastic fluids, not provided for in groups
• F04C 29/02 - Lubrication; Lubricant separation 
• F25B 31/00 - Compressor arrangements
• H02K 5/173 - Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using bearings with rolling contact, e.g. ball bearings
• F01C 21/02 - Arrangements of bearings
• F16C 19/52 - Bearings with rolling contact, for exclusively rotary movement with devices affected by abnormal or undesired conditions
• F25B 31/02 - Compressor arrangements of motor-compressor units
• F04C 23/00 - Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids

Abstract

A screw compressor includes a screw rotor, an electric motor for driving the screw rotor, bearings supporting the screw rotor and casings housing these members. The screw compressor also includes an oil feeding passage formed in the casing for feeding oil on a high pressure side to the bearings by a differential pressure between the high pressure side and a low pressure side and an oil feeding amount adjusting unit placed in a middle of the oil feeding passage, the oil feeding amount adjusting unit includes a cylinder, a valve element provided to reciprocate inside the cylinder, and plural flow paths provided in the valve element having different flow path areas, the plural flow paths are switched to adjust an oil feeding amount to be fed to the bearings by moving the valve element in accordance with the differential pressure between the high pressure side and the low pressure side.

IPC Classes  ?

• F04C 18/16 - Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
• F04C 29/02 - Lubrication; Lubricant separation 
• F04C 28/24 - Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by using valves controlling pressure or flow rate, e.g. discharge valves
• F04C 23/00 - Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids

Abstract

A cooling/heating switching unit includes first to third fittings, expansion valves and expansion-valve driving sections, a housing, a heat insulating material, and a refrigerant leak detection sensor. The first and second fittings respectively connect with a high/low-pressure-gas main pipe and a low-pressure-gas main pipe, which are linked to an outdoor unit. The third fitting connects with an indoor-unit connection pipe, which is linked to indoor units. The expansion valve for high/low-pressure-gas pipe, the expansion valve for low-pressure-gas pipe, and expansion-valve driving sections selectively connect the first or second fitting with the third fitting via a refrigerant pipe to control a flow direction of refrigerant. The housing houses the refrigerant pipe. The heat insulating material fills inside of the housing to insulate the refrigerant pipe arranged inside of the housing from heat. The refrigerant leak detection sensor is installed outside of the housing to detect leaked refrigerant.

IPC Classes  ?

• F25B 13/00 - Compression machines, plants or systems, with reversible cycle
• F25B 49/02 - Arrangement or mounting of control or safety devices for compression type machines, plants or systems

Abstract

The present invention provides a compressor for refrigeration and air conditioning and a refrigeration and air conditioning device capable of achieving both favorable environmental performance and favorable refrigeration cycle efficiency. In the compressor for refrigeration and air conditioning, a refrigerator oil containing a polyol ester and a refrigerant containing difluoromethane are enclosed. The polyol ester has two or more repetitions of poly[2,2-di(alkanoyloxymethyl)oxytrimethylene] as a structural unit. Further, the polyol ester is composed of only one or both of a cyclic polyol ester, which is obtained by cyclically polymerizing a molecular chain having the structural unit, and a crosslinked polyol ester, which is obtained by crosslinking molecular chains having the structural unit with each other through a crosslinkable structural unit polymerized with the structural unit.

IPC Classes  ?

• C09K 5/04 - Materials undergoing a change of physical state when used the change of state being from liquid to vapour or vice-versa
• C10M 105/38 - Esters of polyhydroxy compounds
• C10M 107/32 - Condensation polymers of aldehydes or ketones; Polyesters; Polyethers
• C10M 171/00 - Lubricating compositions characterised by purely physical criteria, e.g. containing as base-material, thickener or additive, ingredients which are characterised exclusively by their numerically specified physical properties, i.e. containing ingredien
• F04B 39/06 - Cooling; Heating; Prevention of freezing
• C10M 105/44 - Complex esters, i.e. compounds containing at least three esterified carboxyl groups and derived from the combination of at least three different types of the following five types of compound: monohydroxy compounds, polyhydroxy compounds, monocarboxyl derived from the combination of monocarboxylic acids, dicarboxylic acids and dihydroxy compounds only and having no free hydroxy or carboxyl groups
• F04B 39/00 - Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups
• C10N 40/30 - Refrigerator lubricant
• F04B 39/02 - Lubrication
• F25B 1/02 - Compression machines, plants or systems with non-reversible cycle with compressor of reciprocating-piston type
• F25B 1/047 - Compression machines, plants or systems with non-reversible cycle with compressor of rotary type of screw type
• F25B 31/02 - Compressor arrangements of motor-compressor units

Abstract

There are provided a heat exchange apparatus and an air conditioner in which an occurrence of uneven refrigerant distribution of a heat exchanger is reduced such that heat exchange performance improves. The heat exchange apparatus includes: a heat-transfer pipe through which a refrigerant flows; a heat exchanger in which a plurality of the heat-transfer pipes are connected to one another; a distributor that distributes the refrigerant to the plurality of heat-transfer pipes; an inflow pipe that causes the refrigerant to flow into the distributor; and a confluent pipe which is connected to an intermediate position of the inflow pipe and in which the refrigerant flowing through an inside thereof is to merge with the refrigerant flowing through an inside of the inflow pipe. A merging part between the inflow pipe and the confluent pipe is positioned in the vicinity of the distributor.

IPC Classes  ?

• F25B 39/00 - Evaporators; Condensers
• F25B 13/00 - Compression machines, plants or systems, with reversible cycle
• F25B 40/02 - Subcoolers
• F25B 41/06 - Flow restrictors, e.g. capillary tubes; Disposition thereof
• F28F 9/02 - Header boxes; End plates
• F25B 39/02 - Evaporators
• F28D 1/047 - Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or mo with the heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being bent, e.g. in a serpentine or zig-zag
• F25B 39/04 - Condensers
• F28D 1/04 - Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or mo with the heat-exchange conduits immersed in the body of fluid with tubular conduits
• F28D 21/00 - Heat-exchange apparatus not covered by any of the groups

Abstract

c having different communication speeds; communication speed recognizing means 18 for recognizing whether or not a communication line 15 from an outdoor unit 10 is connected to any of the communication means, from the communication speed of the control information signal; and communication means confirmation means 18 for confirming the communication means that performs the following communication based on the recognized communication speed, are provided. According to this, it is possible to recognize the communication speed of an input signal without providing a manual changeover switch. Therefore, it is possible to solve at least one or more of the problems that the installation work is complicated, that a setting error of the changeover switch is likely to be generated, and that the product prices increase.

IPC Classes  ?

• F24F 11/89 - Arrangement or mounting of control or safety devices
• F24F 11/30 - Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
• F24F 110/20 - Humidity
• F24F 110/00 - Control inputs relating to air properties
• F24F 110/10 - Temperature
• F24F 1/00 - Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station

Abstract

A controller of an inverter control apparatus includes an A/D conversion unit that performs digital conversion of an input signal when a signal for either an A/D converter start trigger or an A/D converter start trigger is input thereinto; a first inverter control unit that generates the A/D converter start trigger which starts the A/D conversion unit, based on A/D converter start timing information and a first carrier signal; a second inverter control unit that generates the A/D converter start trigger which starts the A/D conversion unit, based on A/D converter start timing information and a second carrier signal; and an A/D start factor selection unit that receives either the A/D converter start trigger or the A/D converter start trigger and selects an A/D start factor at a predetermined period timing of an operation period of the first carrier signal and the second carrier signal.

IPC Classes  ?

• H02M 5/42 - Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
• H02M 7/68 - Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters
• H02M 3/24 - Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
• H02M 7/44 - Conversion of dc power input into ac power output without possibility of reversal by static converters
• H02M 7/521 - Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only in a bridge configuration
• H02P 27/08 - Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation
• H02P 6/18 - Circuit arrangements for detecting position without separate position detecting elements
• H02P 21/24 - Vector control not involving the use of rotor position or rotor speed sensors
• H02P 6/04 - Arrangements for controlling or regulating the speed or torque of more than one motor
• F25B 49/02 - Arrangement or mounting of control or safety devices for compression type machines, plants or systems

Abstract

An air conditioner 1 includes: an outdoor heat exchanger 14; an outdoor fan 12 for blowing air to the outdoor heat exchanger; an outdoor fan motor 20 that drives the outdoor fan; an outdoor fan inverter 21 that drives the outdoor fan motor; and a control unit 31 that generates a rotation-speed command voltage for controlling the rotation number of the outdoor fan motor. In addition, the control unit starts a defrost operation of the outdoor heat exchanger, based on the rotation-speed command voltage. In this manner, it is possible to achieve an outdoor device of an air conditioner in which there is no need to provide a current detecting sensor, and it is possible to detect frost formation over the heat exchanger during a heating operation and to perform a defrost operation at low costs.

IPC Classes  ?

• F25B 47/02 - Defrosting cycles
• F24F 11/89 - Arrangement or mounting of control or safety devices
• F24F 11/30 - Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
• F24F 11/77 - Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity by controlling the speed of ventilators
• F24F 11/65 - Electronic processing for selecting an operating mode
• F24F 11/42 - Defrosting; Preventing freezing of outdoor units
• F24F 1/0003 - Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station characterised by a split arrangement, wherein parts of the air-conditioning system, e.g. evaporator and condenser, are in separately located units

Abstract

A heat exchanger includes a refrigerant flow path into which a gas refrigerant flows from two gas-side inlets in the second row, that are positioned off from each other. Refrigerant flow paths from the two gas-side inlets converge in the one end portion. The refrigerant flow path connects to a heat-transfer pipe in the first row from the second row. The refrigerant flow path includes a refrigerant flow path which is formed in a range from the same stage as one of the gas-side inlets of the second row to the same stage as the other of the gas-side inlets of the second row, while being arranged along both ways between the one end portion and the other end portion in the first row, and the refrigerant flow path extends to a liquid-side outlet.

IPC Classes  ?

• F24F 1/18 - Heat exchangers specially adapted for separate outdoor units characterised by their shape
• F25B 41/06 - Flow restrictors, e.g. capillary tubes; Disposition thereof
• F25B 13/00 - Compression machines, plants or systems, with reversible cycle
• F25B 39/00 - Evaporators; Condensers
• F25B 40/02 - Subcoolers
• F24F 11/89 - Arrangement or mounting of control or safety devices
• F25B 1/00 - Compression machines, plants or systems with non-reversible cycle
• F25B 41/00 - Fluid-circulation arrangements
• F28D 1/047 - Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or mo with the heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being bent, e.g. in a serpentine or zig-zag
• F25B 39/02 - Evaporators

Abstract

A fan includes a fan member, a motor that drives to rotate the fan member, and a rotating shaft that is connected to the fan via a vibration prevention member and transmits a turning force of the motor to the fan. The vibration prevention member is an elastic member that connects an inner cylinder made of metal included in the rotating shaft and an outer cylinder made of metal included in the fan member. At least one of an outer circumferential section of the inner cylinder and an inner circumferential section of the outer cylinder is configured in a polygonal shape when viewed from the rotating shaft direction. A turning force received by the vibration prevention member acts as compression stress on an adhesion interface between a vibration prevention material and metal.

IPC Classes  ?

• F24F 1/0022 - Centrifugal or radial fans
• F24F 1/0047 - Indoor units, e.g. fan coil units characterised by mounting arrangements mounted in the ceiling or at the ceiling
• F04D 25/08 - Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
• F04D 25/06 - Units comprising pumps and their driving means the pump being electrically driven
• F04D 29/053 - Shafts
• F04D 29/28 - Rotors specially adapted for elastic fluids for centrifugal or helico-centrifugal pumps
• F04D 29/66 - Combating cavitation, whirls, noise, vibration, or the like; Balancing
• F24F 1/0014 - Indoor units, e.g. fan coil units characterised by air outlets having two or more outlet openings
• F24F 1/38 - Fan details of outdoor units, e.g. bell-mouth shaped inlets or fan mountings
• F04D 29/32 - Rotors specially adapted for elastic fluids for axial-flow pumps
• F24F 13/22 - Means for preventing condensation or evacuating condensate

Abstract

A display device which displays operation information of an air conditioner in which an outdoor machine including an outdoor heat exchanger and an indoor machine including an indoor heat exchanger are connected. The display device includes a control unit that determines whether or not abnormality occurs in the outdoor machine or the indoor machine when the air conditioner operates, and a display unit which is controlled by the control unit so as to display time information and to display a plurality of operation information display regions for displaying operation information corresponding to the time information, in line. In a case where the control unit determines that the abnormality has occurred in the outdoor machine or the indoor machine, the control unit controls the display unit to display operation information of the outdoor machine or the indoor machine in which the abnormality has occurred, in the operation information display region.

IPC Classes  ?

• G05D 23/00 - Control of temperature
• F24F 11/32 - Responding to malfunctions or emergencies
• F24F 11/89 - Arrangement or mounting of control or safety devices
• F24F 11/62 - Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
• F24F 11/30 - Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
• F25B 49/00 - Arrangement or mounting of control or safety devices
• F24F 11/52 - Indication arrangements, e.g. displays

Abstract

The present disclosure provides an indoor unit of an air conditioner includes a housing, a centrifugal fan arranged inside the housing, and a heat exchanger arranged so as to surround the centrifugal fan, in which the heat exchanger includes an area cut in a direction of rotation of the centrifugal fan. A current plate provided at a final portion of the heat exchanger in the direction of the rotation of the centrifugal fan includes a first face which is extended in a height direction of the heat exchanger and blocks an air flow produced between the centrifugal fan and the heat exchanger and a second face protruded from the first face in a direction opposite the air flow. The indoor unit has an advantageous effect to suppress an inflow of air to a space where the heat exchanger is cut in the indoor unit to reduce the power consumption.

IPC Classes  ?

• F24F 13/06 - Outlets for directing or distributing air into rooms or spaces, e.g. ceiling air diffuser
• F24F 1/0022 - Centrifugal or radial fans
• F24F 1/0047 - Indoor units, e.g. fan coil units characterised by mounting arrangements mounted in the ceiling or at the ceiling

Abstract

A DC power supply unit is provided that allows for improving efficiency and reducing harmonic currents. A DC power supply unit includes: a bridge rectification circuit having diodes and MOSFETs; a reactor that is arranged between the AC power supply and the bridge rectifier circuit; a smoothing capacitor that is connected to an output side of the bridge rectifier circuit and smoothes a voltage; and a converter control unit that executes, based on predetermined threshold values, a diode rectification control that uses diodes and parasitic diodes of the MOSFETs, a synchronous rectification control that switches the MOSFETs in synchronization with a polarity of the voltage of the AC power supply, a partial switching control that repeats partially short-circuiting the reactor multiple times in a half cycle of the AC power supply, or a fast switching control that short-circuits the reactor at a predetermined frequency over a full AC cycle.

IPC Classes  ?

• H02M 7/04 - Conversion of ac power input into dc power output without possibility of reversal by static converters
• H02P 7/24 - Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices
• H02M 1/42 - Circuits or arrangements for compensating for or adjusting power factor in converters or inverters

Abstract

Task: To provide a high quality air conditioner with high efficiency and stability, preventing adverse effect of manufacturing variation on the refrigerant distribution. Solution: The air conditioner having an expansion valve for decompressing a refrigerant, and a heat exchanger for heat exchange between the refrigerant and air. The air conditioner includes a first linearly shaped piping that is connected to the expansion valve and vertically disposed, a branch pipe connected to the first piping for branching a refrigerant flow path into a plurality of sections, a plurality of second pipings connected to the branch pipe, and a plurality of distributors connected to the second piping for further branching the refrigerant flow path to the heat exchanger.

IPC Classes  ?

• F25B 39/02 - Evaporators
• F28F 9/02 - Header boxes; End plates
• F25B 13/00 - Compression machines, plants or systems, with reversible cycle
• F28D 1/047 - Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or mo with the heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being bent, e.g. in a serpentine or zig-zag

Abstract

A screw compressor and a chiller unit are provided. An oil separator of the screw compressor may include an outer cylinder, an inner cylinder positioned inside the outer cylinder, and an introducing flow path. The upper end of the inner cylinder is held by the oil separator and the outer wall of the inner cylinder is held independently of the inner wall of the outer cylinder. The diameter of the inner wall of the outer cylinder may gradually be reduced along the swirl flow path. The refrigerant via the introducing passage swirls and goes down along the swirl flow path and is separated into gas refrigerant and oil. The separated gas refrigerant flows from the lower end of the inner cylinder into the inner cylinder and goes up, and the separated oil flows down along the inner wall surface of the outer cylinder.

IPC Classes  ?

• F03C 2/00 - Rotary-piston engines
• F03C 4/00 - Oscillating-piston engines
• F04C 2/00 - Rotary-piston machines or pumps
• F04C 27/02 - Liquid sealing for high-vacuum pumps
• F04C 29/02 - Lubrication; Lubricant separation 
• F25B 43/02 - Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat for separating lubricants from the refrigerant
• F04C 18/16 - Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
• F04C 23/00 - Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
• F04C 18/08 - Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
• F25B 13/00 - Compression machines, plants or systems, with reversible cycle
• B01D 19/00 - Degasification of liquids
• B01D 46/10 - Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces
• B01D 45/12 - Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces

Abstract

A hot gas bypass circuit that connects a discharge side of the compressor and a portion between the heat source side heat exchanger and the expansion valve, an on-off valve that opens and closes a channel of the hot gas bypass circuit, and a control device performing control to select one of hot gas bypass defrosting and reverse cycle defrosting according to a frosting amount on the heat source side heat exchanger and perform defrosting. The control device controls to open the on-off valve of the hot gas bypass circuit such that a part of a refrigerant discharged from the compressor is supplied to the heat source side heat exchanger via the hot gas bypass circuit and, the control device switches switch the four-way valve such that the refrigerant discharged from the compressor is supplied to the heat source side heat exchanger after passing through the four-way valve.

IPC Classes  ?

• F25B 47/02 - Defrosting cycles
• F24F 11/89 - Arrangement or mounting of control or safety devices
• F25B 49/02 - Arrangement or mounting of control or safety devices for compression type machines, plants or systems
• F25B 41/04 - Disposition of valves

Abstract

A slide valve forming a part of a bore and movable in an axial direction of the rotors, foot sections on a discharge side end face of the slide valve, and discharge ports and on a discharge chamber side of the slide valve in order to discharge compressed gas taken into a compression operation chamber from the suction chamber and compressed. At a discharge side end portion of the slide valve, first discharge channels and lead the compressed gas discharged from the discharge port and lead the compressed gas to the discharge chamber and second discharge channels are provided on a radial direction outer side of the first discharge channel and opened to the first discharge channels and the discharge chamber to lead a part of the compressed gas flowing in the first discharge channels and feed the part of the compressed gas to the discharge chamber.

IPC Classes  ?

• F04C 18/16 - Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
• F04C 28/12 - Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by changing the positions of the inlet or outlet openings with respect to the working chamber using sliding valves
• F04C 29/12 - Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet
• F04C 28/24 - Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by using valves controlling pressure or flow rate, e.g. discharge valves

Abstract

The present invention is intended to provide a general-purpose display device that is able to display on a display unit easily operating information required for assessing a test operation state, and an application program to be executed by the display device. Accordingly, in this display device which displays on the display unit the operating information of an air conditioner in which an outdoor unit provided with an outdoor heat exchanger and an indoor unit provided with an indoor heat exchanger are connected by a refrigerant pipe and a refrigerant is circulated by a compressor, a control unit of the display device controls the display unit so that time information is displayed horizontally and a first operating information display area and a second operating information display area for displaying first operating information and second operating information, respectively, corresponding to the time information are displayed vertically side by side.

IPC Classes  ?

• F24F 11/30 - Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
• F24F 11/52 - Indication arrangements, e.g. displays
• G06F 3/0482 - Interaction with lists of selectable items, e.g. menus
• G06F 3/0485 - Scrolling or panning

Abstract

The air conditioner has: an outdoor heat exchanger that exchanges heat between the air and a refrigerant flowing in the interior of this heat exchanger; an outdoor fan that blows air into the outdoor heat exchanger; an outdoor fan motor that rotationally drives the outdoor fan; an outdoor fan inverter that supplies a desired current to the outdoor fan motor; a current detector that detects the current flowing in the outdoor fan motor; and a control unit that controls the outdoor fan inverter such that the rotational frequency of the outdoor fan motor reaches a target rotational frequency. The control unit starts a defrosting operation of the outdoor heat exchanger on the basis of a detection value from the current detector during the heating operation.

IPC Classes  ?

• F24F 11/42 - Defrosting; Preventing freezing of outdoor units
• F25B 47/02 - Defrosting cycles
• F25B 13/00 - Compression machines, plants or systems, with reversible cycle

Abstract

The present invention provides a heat exchanger having a heat exchanging portion HE including a plurality of paths through which a refrigerant flows and a plurality of columns of fin plate that exchange heat between the refrigerant and air, wherein, in a case where the heat exchanging portion functions as a condenser, the refrigerant is flown from a header into the heat exchanging portion HE via the plurality of paths, every two paths of the plurality of paths merge into one single path by branching/merging pipes after the refrigerant has flown through one fin plate, before the refrigerant flows through the other fin plate so as to flow out of the heat exchanging portion HE, wherein a difference in height between the highest path and the lowest path in a vertical direction is set equal to or less than half of a height of the heat exchanging portion HE.

IPC Classes  ?

• F25B 39/00 - Evaporators; Condensers
• F25B 13/00 - Compression machines, plants or systems, with reversible cycle
• F28D 1/047 - Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or mo with the heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being bent, e.g. in a serpentine or zig-zag
• F28F 13/06 - Arrangements for modifying heat transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media
• F28F 1/32 - Tubular elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending transversely the means having portions engaging further tubular elements
• F28D 21/00 - Heat-exchange apparatus not covered by any of the groups

Abstract

A scroll compressor has a sealed container inside which a working fluid is sealed; a frame fixed inside the sealed container; a fixed scroll provided with a fixed-side spiral body formed in a spiral shape on a fixed-side base plate fixed inside the sealed container; and a revolving scroll in which a revolving-side spiral body meshing with the fixed-side spiral body is provided on a revolving-side base plate. The frame includes a first welded point at which the frame is fixed by welding to the sealed container, and a revolving-scroll-receiving surface supports a bottom surface of the revolving-side base plate opposite to a surface thereof on which the revolving-side spiral body is provided. A frame outer peripheral groove provided in an outer periphery of the frame faces an inner periphery of the sealed container between the revolving-scroll-receiving surface and the first welded point.

IPC Classes  ?

• F04C 23/00 - Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
• F04B 39/12 - Casings; Cylinders; Cylinder heads; Fluid connections
• B23K 33/00 - Specially-profiled edge portions of workpieces for making soldering or welding connections; Filling the seams formed thereby
• B23K 101/12 - Vessels
• F04C 18/02 - Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
• F01C 1/02 - Rotary-piston machines or engines of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
• F01C 21/10 - Outer members for co-operation with rotary pistons; Casings
• F04C 29/00 - Component parts, details, or accessories, of pumps or pumping installations specially adapted for elastic fluids, not provided for in groups

Abstract

An air conditioning apparatus suppresses an increase in power consumption associated with a reduction in start-stop frequency of a compressor. The air conditioning apparatus includes an outdoor unit equipped with a compressor and a plurality of indoor units connected with the outdoor unit and has a control device that performs thermo-off and thermo-on control such that a suction air temperature of the indoor unit falls within a predetermined temperature range with a set temperature defined as a reference. The control device detects the suction air temperatures of the indoor units, and, in a case where a sum total of air conditioning capacities of the indoor units, the suction air temperatures of which are between the set temperature and the thermo-off temperature, is at least a predetermined value, makes at least one indoor unit, the suction air temperatures of which are between the set temperature and the thermo-off temperature, forcedly thermo-off.

IPC Classes  ?

• F24F 11/30 - Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
• F24F 11/83 - Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
• F24F 11/77 - Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity by controlling the speed of ventilators
• F25B 13/00 - Compression machines, plants or systems, with reversible cycle
• F24F 11/56 - Remote control
• F24F 110/12 - Temperature of the outside air
• F24F 11/61 - Control or safety arrangements characterised by user interfaces or communication using timers
• F24F 110/10 - Temperature
• F24F 11/84 - Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves

Abstract

An air-conditioning remote controller allowing a user to intuitively grasp a setting status of an air-conditioner and to use the controller commonly between a plurality of models of the main body of the air-conditioners, the air-conditioning remote controller including an input unit to input setting values for setting items relating to air-conditioning control, and a display unit having a predetermined area to display a plurality of icons thereon and displaying setting values and icons depending on the number of taps, wherein the display unit changes the number of displayable icons depending on the number of taps for the main body of the air-conditioner controlled using the setting values, and also displays the icons with the larger size per tap as the number of the icons in the air-conditioner is getting smaller.

IPC Classes  ?

• F24F 11/00 - Control or safety arrangements

Abstract

In order to derive, from operation data obtained from an air conditioner, the correct cause of malfunction of the air conditioner and the suitable repair information, a diagnostic system is connected to an outdoor unit and the indoor units of the air conditioner, which is provided with communication units. A mobile communication terminal requests that the communication units of the air conditioner transmit the operation data and the model data to the mobile communication terminal, which then communicates with a maintenance server system storing a diagnostic program corresponding to each model of air conditioner. Then, either the maintenance server system or the mobile communication terminal uses the diagnostic program corresponding to the model data to make a diagnosis of the air conditioner on the basis of the received model data and operation data. The diagnostic result is displayed on a display unit of the mobile communication terminal.

IPC Classes  ?

• F24F 11/89 - Arrangement or mounting of control or safety devices
• F24F 11/30 - Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
• F04D 27/00 - Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
• F24F 11/56 - Remote control
• F24F 11/52 - Indication arrangements, e.g. displays

Abstract

Provided is a scroll compressor capable of ensuring reliability of a release valve device. The scroll compressor is provided with: an orbiting scroll having an orbiting scroll wrap; a fixed roll having a fixed scroll wrap intermeshing with the orbiting scroll wrap; a release hole formed in the fixed scroll; a housing hole communicating with the release hole and having larger diameter than that of the release hole; a valve seat member which is housed in the housing hole and has a valve seat surface; a valve plate contacting with or separating from the valve seat surface by a pressure difference; a spring for pressing the valve plate against the valve seat surface; a stopper which is equipped with the spring and secures the valve seat member; and a retainer for securing the stopper.

IPC Classes  ?

• F04C 18/02 - Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
• F04C 23/00 - Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
• F04C 28/26 - Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by using valves controlling pressure or flow rate, e.g. discharge valves using bypass channels
• F04C 29/12 - Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet

Abstract

A refrigerant distributor includes an inlet pipe, a header pipe to which the inlet pipe has been connected and a plurality of refrigerant pipes connected to one end side of the header pipe which is opposite to the side that the inlet pipe is connected, below the inlet pipe in a vertical direction, and is configured such that a refrigerant which has flown into the header pipe through the inlet pipe is distributed into the plurality of refrigerant pipes. The header pipe is arranged such that a vertical upper side of the header pipe is inclined toward the one end side that the refrigerant pipes are connected. Thereby, it is possible to stably distribute the refrigerant to each refrigerant pipe while suppressing an increase in cost under flow rate conditions ranging from a rated operation condition to a low rotating speed operation condition.

IPC Classes  ?

• F25B 39/02 - Evaporators
• F25B 41/00 - Fluid-circulation arrangements
• F25B 13/00 - Compression machines, plants or systems, with reversible cycle
• F25B 39/04 - Condensers
• F28F 9/02 - Header boxes; End plates
• F28D 1/053 - Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or mo with the heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being straight

Abstract

Provided is a working medium of the present invention for absorption refrigerators is a mixture that is to contact a carbon steel or a copper alloy that is a structural material of any one of the absorption refrigerators, and includes water and 1,4-dioxane, and further includes a corrosion inhibitor. The corrosion inhibitor includes one or more selected from the group consisting of respective hydroxides of any alkali metal and any alkaline earth metal, and respective oxoates. Thus, corrosion of the structural material of the absorption refrigerator can be restrained.

IPC Classes  ?

• C09K 5/04 - Materials undergoing a change of physical state when used the change of state being from liquid to vapour or vice-versa
• F25B 21/02 - Machines, plants or systems, using electric or magnetic effects using Nernst-Ettinghausen effect

Abstract

In a permanent magnet electric motor, a plurality of projections are formed at least partially along an axial direction in the magnet insertion openings, the projection positioning both edges of the permanent magnet in the circumferential direction so that vacant spaces are defined at each sides of the permanent magnet in the circumferential direction; a plurality of slits arranged along the circumferential direction are provided in regions, the region being positioned radially outward from the permanent magnet and being sandwiched at the edges of the permanent magnet in the circumferential direction by the projections; and the shortest distance between the slit and the magnet insertion opening is set to be greater than the shortest distance between the slit and an outer circumferential surface of the rotor core.

IPC Classes  ?

• H02K 1/27 - Rotor cores with permanent magnets
• H02K 1/16 - Stator cores with slots for windings

Abstract

d is φDt and the outer diameter of the thrust stopper is φDs, φDt<φDs holds.

IPC Classes  ?

• F01C 1/02 - Rotary-piston machines or engines of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
• F01C 1/063 - Rotary-piston machines or engines of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents with coaxially-mounted members having continuously-changing circumferential spacing between them
• F03C 2/00 - Rotary-piston engines
• F03C 4/00 - Oscillating-piston engines
• F04C 2/00 - Rotary-piston machines or pumps
• F04C 18/00 - Rotary-piston pumps specially adapted for elastic fluids
• F04C 29/00 - Component parts, details, or accessories, of pumps or pumping installations specially adapted for elastic fluids, not provided for in groups
• F04C 23/00 - Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
• F04C 29/02 - Lubrication; Lubricant separation 
• F04C 18/02 - Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
• F04C 27/00 - Sealing arrangements in rotary-piston pumps specially adapted for elastic fluids

Abstract

Provided is an air conditioner which comprises multiple outdoor units, the air conditioner being configured so that, with the use of a low cost configuration, required refrigeration machine oil is supplied to all the outdoor units through refrigerant piping and so that the air conditioner has increased reliability. An air conditioner is provided with multiple indoor units and with four outdoor units which are connected to the multiple indoor units through refrigerant piping. A line of first refrigerant piping leading from the multiple indoor units is branched into two lines of second refrigerant piping, each of the two lines of second refrigerant piping is branched into two lines of third refrigerant piping, and the four lines of third refrigerant piping are respectively connected to the four outdoor units.

IPC Classes  ?

• F24F 1/32 - Refrigerant piping for connecting the separate outdoor unit to indoor units
• F24F 1/28 - Refrigerant piping for connecting several separate outdoor units

Abstract

A screw compressor is disclosed, which includes a male rotor and a female rotor and an oil separator. The oil separator includes an outer cylinder, an inner cylinder located inside the outer cylinder, and an introducing flow path. An upper end portion of the inner cylinder is held by the oil separator and an outer wall of the inner cylinder is held independently of the inner wall of the outer cylinder. A diameter of an inner wall of the outer cylinder is configured so that the diameter is gradually reduced along a swirl flow path. Moreover, refrigerant that flowed in swirls and goes down along the swirl flow path. The separated gas refrigerant flows from a lower end portion of the inner cylinder into the inner cylinder and goes up and the separated oil flowing down along the inner wall surface of the outer cylinder.

IPC Classes  ?

• F03C 4/00 - Oscillating-piston engines
• F04C 2/00 - Rotary-piston machines or pumps
• F04C 15/00 - Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups
• F04C 29/02 - Lubrication; Lubricant separation 
• F04C 18/16 - Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
• F04C 23/00 - Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
• F04C 18/08 - Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
• F25B 13/00 - Compression machines, plants or systems, with reversible cycle
• B01D 19/00 - Degasification of liquids
• B01D 46/10 - Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces
• B01D 45/12 - Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces

Abstract

c4 from the other end section 21B to the one end section 21A are arranged to be adjacent to each other.

IPC Classes  ?

• F28F 1/32 - Tubular elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending transversely the means having portions engaging further tubular elements
• F24F 1/00 - Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
• F28D 1/047 - Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or mo with the heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being bent, e.g. in a serpentine or zig-zag
• F28D 1/02 - Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or mo with the heat-exchange conduits immersed in the body of fluid
• F28F 9/02 - Header boxes; End plates
• F25B 13/00 - Compression machines, plants or systems, with reversible cycle
• F25B 39/02 - Evaporators
• F28D 21/00 - Heat-exchange apparatus not covered by any of the groups

Abstract

Provided is an air heat exchanger capable of preventing an increase in ventilation resistance and a decrease in heat exchange efficiency due to condensation water generated on surfaces of heat transfer fins, without increasing thermal resistance of flat tubes and the heat transfer fins, and preventing scattering of water droplets downwind from the heat transfer fins. In the air heat exchanger including a plurality of flat tubes 2 and heat transfer fins 5 provided between the flat tubes 2 and on which air is blown, the flat tubes 2 include water draining grooves 4 on side surfaces on which the heat transfer fins 5 are provided and the heat transfer fins 5 include water guiding grooves 6 communicating with the water draining grooves 4. At least a groove wall 40 on the upwind side of an air blowing direction 10 among groove walls forming the water guiding grooves 6 is provided from a position of the upwind side from the water draining grooves 4 to the water draining grooves 4. The water guiding grooves 6 extend toward the water draining grooves 4 along the groove wall 40 on the upwind side and an area of a cross section perpendicular to an extension direction decreases toward the water draining grooves 4.

IPC Classes  ?

• F25D 21/14 - Collecting or removing condensed and defrost water; Drip trays
• F28F 17/00 - Removing ice or water from heat-exchange apparatus
• F28D 1/053 - Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or mo with the heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being straight
• F28F 1/12 - Tubular elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
• F28F 1/32 - Tubular elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending transversely the means having portions engaging further tubular elements
• F28D 21/00 - Heat-exchange apparatus not covered by any of the groups