A system for measuring the position of a rod element as, for example, a hydraulically or pneumatically operated piston rod. Unlike the prior art, the system according to the present invention employs a measuring principle that does not require preparatory treatment of the rod element as is required in the known solutions. The system employs direct time of flight measurements with the aid of acoustic surface waves that are introduced into the rod element. The instrument is retrofittable on existing cylinders without any modification/reconstruction thereof. An EMAT principle is employed to introduce the surface waves into the measurement in a non-contact manner.
F15B 15/28 - Means for indicating the position, e.g. end of stroke
F15B 19/00 - Testing fluid-pressure actuator systems or apparatus, so far as not provided for elsewhere
G01D 5/48 - Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using wave or particle radiation means
G01S 15/02 - Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems using reflection of acoustic waves
The present invention relates to system for measuring pressure and temperature based on change in the characteristic properties of a medium for ultrasound under the effect of pressure and temperature. The invention is based on two waveguides where geometry is adapted to the medium's characteristic properties for ultrasound such that only planar pressure waves are generated in the waveguides. The first of the waveguides is arranged for measuring temperature due to thermal expansion of the medium, where the medium is pressure-compensated by means of an internal compensator to prevent thermal pressure accumulation, and where measuring temperature is based on the medium's specific known characteristic data for ultrasound under the effect of temperature under constant pressure. The second waveguide is arranged for measuring pressure, based on waveguide and the medium's known characteristic properties for thermal expansion and pressure, and where the thermal effect is corrected analytically based on measurement of temperature in the first channel. The physical principle of the invention is based on the properties of a medium (oil) where the stability for high temperature and pressure is crucial for long-term properties. Long-term properties of ultrasound sensors are not physically linked to the medium's properties, such that change in characteristic properties of ultrasound sensors does not impair the accuracy of the medium unless the function of the ultrasound sensors ceases. The physical principle of the invention allows an arrangement where ultrasound sensors can be separated from measuring channels by a pressure barrier, such that the integrity of the pressure barrier is not broken.
G01L 19/00 - MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE - Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
G01N 29/036 - Analysing fluids by measuring frequency or resonance of acoustic waves
G01N 29/32 - Arrangements for suppressing undesired influences, e.g. temperature or pressure variations
3.
SYSTEM FOR POSITION MEASURING AND INTEGRITY MEASURING
A system for measuring the position of a rod element (3) as, for example, a hydraulically or pneumatically operated piston rod. Unlike the prior art, the system according to the present invention employs a measuring principle that does not require preparatory treatment of the rod element as is required in the known solutions. The system employs direct time of flight measurements with the aid of acoustic surface waves that are introduced into the rod element. The instrument is retrofittable on existing cylinders without any modification/ reconstruction thereof. An EMAT (6) principle is employed to introduce the surface waves into the measurement in a non-contact manner.
F15B 15/28 - Means for indicating the position, e.g. end of stroke
F15B 19/00 - Testing fluid-pressure actuator systems or apparatus, so far as not provided for elsewhere
G01D 5/48 - Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using wave or particle radiation means
G01D 5/62 - Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using means specified in two or more of groups , , , , and using wave or particle radiation means not covered by group
The present invention relates to system for measuring pressure and temperature based on change in the characteristic properties of a medium for ultrasound under the effect of pressure and temperature. The invention is based on two waveguides where geometry is adapted to the medium's characteristic properties for ultrasound such that only planar pressure waves are generated in the waveguides. The first of the waveguides is arranged for measuring temperature due to thermal expansion of the medium, where the medium is pressure-compensated by means of an internal compensator to prevent thermal pressure accumulation, and where measuring temperature is based on the medium's specific known characteristic data for ultrasound under the effect of temperature under constant pressure. The second waveguide is arranged for measuring pressure, based on waveguide and the medium's known characteristic properties for thermal expansion and pressure, and where the thermal effect is corrected analytically based on measurement of temperature in the first channel. The physical principle of the invention is based on the properties of a medium (oil) where the stability for high temperature and pressure is crucial for long-term properties. Long-term properties of ultrasound sensors are not physically linked to the medium's properties, such that change in characteristic properties of ultrasound sensors does not impair the accuracy of the medium unless the function of the ultrasound sensors ceases. The physical principle of the invention allows an arrangement where ultrasound sensors can be separated from measuring channels by a pressure barrier, such that the integrity of the pressure barrier is not broken.
A universal rail for a firearm has a plurality of through holes and a plurality of attachment points for ancillary equipment along a length of the universal rail, a fastener so as to be fastenable to the firearm, and a power or signal connection point arranged in at least one attachment point of the plurality of attachment points. The power or signal connection point has at least two contact pins surrounded by a seal, and a resilient portion and inner contact faces. The power or signal connection point is further connected to conductors arranged in the universal rail. The resilient portion ensures that the at least two contact pins and contact points are out of contact with each other when the ancillary equipment is not mounted on the universal rail.
The present invention relates to a system for transmitting electrical signals and/or electrical energy via an electrically conductive medium (7). An eddy current is created when a time-variable current is applied to an electric wound coil (1, 3), in the form of a band with conductor paths extending parallel to the surface of the electrically current-carrying medium, thereby creating a magnetic field which penetrates the surface of the electrically conductive medium (7). Since the magnetic field varies with time, an electric field will be generated which is oriented at 90 degrees to the magnetic field. This electric field will generate a potential difference between an upper and lower part of the electric wound coil (1, 3). The electric field will cause a movement of electrons, thereby creating a flow between the upper and lower part of the electric wound coil (1, 3). This time-variable flow of electrons will attempt to equalize the potential difference by electrons flowing back on the opposite side of the electrically conductive medium (7), thereby creating a circulating flow between an external and an internal surface of the electrically conductive medium (7). Since a flow is created on the opposite side of the generating electric wound coil (1, 3), this flow will form a magnetic field which in turn induces a voltage in the adjacent electric wound coil (1, 3). The system is omnidirectional and acts in both directions.
b) of the electric motor (31). The electric motor is an electric rotary motor. The invention also relates to a pump assembly with a plurality of such driving arrangements.
F04B 49/20 - Control of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for in, or of interest apart from, groups by changing the driving speed
H02K 7/06 - Means for converting reciprocating motion into rotary motion or vice versa
The present invention relates to a universal rail (1), wherein the universal rail (1), along its length, is configured with a plurality of through holes (2) and attachment points (4) for ancillary equipment, and wherein the universal rail (1), by means of suitable fastening means, can be fastened to a firearm. At least one attachment point (4) comprises a power and/or signal connection point (5), the power and/or signal connection point (5) consisting of two contact pins (6) surrounded by a seal (8), a spring device (7) and inner contact points (9). In that the spring device (7) exerts pressure on the contact pins (6), the contact pins (6) will be brought out of engagement with the inner contact points (9) when ancillary equipment is not fastened to the attachment point (4). The inner contact faces (9) are further connected to current conductors which extend in the longitudinal direction of the universal rail (1).
Driving arrangement (11) for a pump, compressor or similar, adapted to provide alternating pressure in at least two chambers (27a, 27b, 27', 27"), such as chambers of a pump or compressor, as result of a reciprocating movement of a bar element (23). The bar element is connected to two movable pressure chamber faces being pistons (21a, 21 b) or plungers having fluid connection to said chambers, which bar element (23) is reciprocally supported in a housing (19). The driving arrangement further comprises an electric motor (31) which is adapted to provide the reciprocating movement of the bar element (23).The bar element extends through the rotor (31b) of the electric motor (31). The electric motor is an electric rotary motor. The invention also relates to a pump assembly with a plurality of such driving arrangements.
The invention relates to a type of shock and vibration isolator which has almost identical rigidity and damping properties in any translatory direction, wherein the device is disposed between a reference object (A) which is subjected to vibrations and shocks, and a means (B) which is only to be subjected to translatory damped vibrations and shocks in all directions, where a centre bar (2) and wire rope holders (3) are designed for attachment to any one of the reference objects (A) or (B), characterised in that the centre bar (2) and the wire rope holders (3) are rigidly interconnected to three or more independent wire rope series (4), each of which is formed of two or more wire rope loops where the configuration of a wire rope series (4) is based on essentially as many wire rope loops with opposite geometrical angles of inclination (A1 and A2), each wire rope series forming a symmetry along a centre axis relative to an unloaded neutral position for the isolator and where the three or more wire rope series (4) are symmetrically arranged about the centre axis in an about-axis symmetry principle relative to the radial neutral position of an unloaded isolator, such that the two symmetry principles together give almost identical translatory properties in all directions for damping of shock and vibration between the reference objects (A) and (B).
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