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 - Moyens pour indiquer la position, p.ex. fin de course
F15B 19/00 - Test des systèmes ou appareils de manœuvre utilisant la pression d'un fluide, dans la mesure où ils ne sont pas prévus ailleurs
G01D 5/48 - Moyens mécaniques pour le transfert de la grandeur de sortie d'un organe sensible; Moyens pour convertir la grandeur de sortie d'un organe sensible en une autre variable, lorsque la forme ou la nature de l'organe sensible n'imposent pas un moyen de conversion déterminé; Transducteurs non spécialement adaptés à une variable particulière utilisant des moyens à base de radiation d'ondes ou de particules
G01D 5/62 - Moyens mécaniques pour le transfert de la grandeur de sortie d'un organe sensible; Moyens pour convertir la grandeur de sortie d'un organe sensible en une autre variable, lorsque la forme ou la nature de l'organe sensible n'imposent pas un moyen de conversion déterminé; Transducteurs non spécialement adaptés à une variable particulière utilisant des moyens spécifiés dans plusieurs des groupes , , , et utilisant des moyens à base de radiation d'ondes ou de particules non couverts par le groupe
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.
G01N 29/024 - Analyse de fluides en mesurant la vitesse de propagation ou le temps de propagation des ondes acoustiques
G01N 29/036 - Analyse de fluides en mesurant la fréquence ou la résonance des ondes acoustiques
G01N 29/32 - Dispositions pour supprimer des influences indésirables, p.ex. des variations de température ou de pression
G01K 11/22 - Mesure de la température basée sur les variations physiques ou chimiques, n'entrant pas dans les groupes , , ou utilisant la mesure d'effets acoustiques
3.
DEVICE FOR TRANSFER OF ELECTRICAL SIGNALS AND/OR ELECTRICAL ENERGY
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.
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).
brevets
