201results about "Transducers" patented technology

There are provided a nozzle capable of enhancing the straight-advancing capability of jetted fluid to increase the back wash effect of a filter member, and a filter-type dust collector capable of effectively carrying out dust removal from a filter member with such a nozzle. To this end, the nozzle has a Laval nozzle section secured to the inside of an outer tube at its proximal end and a fluid guide section disposed at the leading end of the outer tube. The fluid guide section has a plurality of suction holes elongated in the flowing direction of the pressurized fluid. This nozzle is mounted on a pulse header tube of a dust removal device.

A dynamically balanced pneumatic relay amplifier and a current-to-pneumatic converter are disclosed. The relay has a balance plug, a supply plug positioned on top of the balance plug, a bead chain connecting the balance plug and the supply plug, and a vent plug positioned on top of the supply plug. The relay also includes a baffle positioned on top of the vent plug. The converter, used in an electro-pneumatic positioner, comprises a flat strip made of magnetic material located in proximity to a nozzle, and a flow regulator having a flat spring securing a plug in a seat within the regulator. The converter also includes a cantilevered flexure integrally secured to a molded spring support, a first bias spring positioned on a first side of the flexure, and a second bias spring positioned on a second side of the flexure. The thickness of the flexure is locally reduced in an area not integrated into the molded spring support.

A vibration transducer such as a geophone, comprising a central pole piece (110) with a magnet (112) and coil (118) concentrically arranged around it. The position of the magnet (112) is fixed relative to the pole piece (110) and the coil (118) is movable relative to the magnet (112). A method of manufacturing a vibration transducer is characterised in that a bobbin carrying the coils is formed from a substantially tubular body which is positioned on a mandrel and at least one coil is wound around its outer surface, the mandrel being removed from the bobbin when the coil is complete. Another method is characterised in that the coil is formed separately and the bobbin is formed from a substantially tubular body which is positioned inside the coil and expanded to contact the coil when in position.

A bleed-type proportional electromagnetic valve having an input port, output port, and ejection port is disclosed. Fluid force and pressing force, proportionate to an output pressure and a current flowing in a solenoid coil respectively, act on a bleed valve for controlling the output pressure, whereby the valve can obtain an output pressure commensurate to the flowing current by displacing the valve to a position that those forces counterbalance, wherein the valve is provided with a stop valve disposed so as to be in sliding contact with a passage between the input and output port, and in contact with or separated from a valve seat. This enable the stop valve to contact with the valve seat so as to close the input port and communicate the output port with the ejection port when controlling the output pressure to be minimum.

A digital valve positioner for use with an actuator. The digital valve positioner includes a housing, at least one exhaust port opening formed in the housing, and a vent assembly operatively coupled to the at least one exhaust port opening. The vent assembly includes a body having a bore, a valve seat surrounding the bore, and a check valve disposed within the bore. The check valve is arranged to shift from a closed position seated against the valve seat to an open position disposed away from the valve seat. A plurality of barriers is disposed around and positioned to enclose the check valve. The plurality of barriers is arranged to prevent an external medium from entering the check valve and to provide a tortuous flow path for the exhaust medium reducing sound through the vent assembly.

In a proportional solenoid valve, a cylindrical valve seat member includes an input/output-side passage provided between an input port and a drain port and between an output port and the drain port, a seat portion provided in an end portion of the input/output-side passage, and a drain-side passage provided between the seat portion and the drain port. The drain-side passage is formed by exhaust passage holes whose number is an even number equal to four or more and which are arranged at regular intervals in the circumferential direction of the valve seat member.

A positioner operating mode identifying function and an use parameter selecting function are provided in a calculating unit. A positive operating parameter and a negative operating parameter are stored in a storing portion. The positioner operating mode identifying function identifies the operating mode of a positioner or from the direction of change of a control output and the direction of change of an amplified pneumatic pressure signal Pout, and the identification result is set automatically as the current operating mode of the positioner. In accordance with the current operating mode identified for the positioner, the use parameter selecting function selects, as the use parameter from the storing portion, the positive operating parameter if the positive operating mode, and the negative operating parameter if the negative operating mode, and sets the selected use parameter automatically.

The invention relates to a hydraulic transformer, in particular to an electrically controlled clino-axis piston hydraulic transformer. The hydraulic transformer of the invention aims at solving the problems that the current hydraulic transformer is mainly controlled by hands and is inconvenient for operation and difficult for ensuring precision. The front end of a transitional plate (4) of the invention is arranged in the lower part of a shell body (9) and connected with a port plate (2); the rear end of the transitional plate (4) is connected with a main shaft (6) of the port plate; a rear end cover (5) is arranged on the main shaft (6) of the port plate and fixedly connected with the shell body (9); the front end surface of the rear end cover (5) mutually contacts the rear end surface of the transitional plate (4); a driven gear (11) on the transitional plate (4) is meshed with a driving gear (12) on a gear shaft (3); the gear shaft (3) is connected with the outputting end of an servo motor (7) by a coupler (8). The servo motor is adopted in the invention to control the rotating angle of the driven gear by the gear shaft; servo control is introduced, thus not only having convenient operation, but also being capable of realizing precise control and improving the controlling performance of a system.

An uplock assembly for retaining and releasing landing gear systems, said uplock assembly comprising: a thermal actuator comprising: a chamber configured to contain expansible material therein; a heating mechanism coupled to said chamber for heating said expansible material and causing volumetric expansion thereof; a piston slidably coupled to said chamber and adapted to extend in response to said volumetric expansion; and an uplock release mechanism releasably engaged by said piston when extended such that said engaged uplock release mechanism causes the release of said landing gear.

A valve positioner for controlling a valve closure element is provided. The positioner includes a positioner housing with a plurality of fluid flow passageways in fluid communication with a fluid supply source and the valve closure element. The positioner housing is configured to receive a detachable spool manifold assembly. The spool manifold assembly is positioned adjacent the plurality of fluid flow passageways. The spool manifold assembly includes a reciprocally moveable spool configured to selectively port fluid flow from the plurality of fluid flow passageways. The spool manifold assembly includes a diaphragm connected to the spool via a flexible shaft. The diaphragm is in fluid communication with a transducer for receiving a fluid causing the diaphragm to expand or contract and thereby displacing the spool. The flexible shaft is radially elastic in order to minimize axial backlash between the diaphragm and the spool. The flexible shaft configuration minimizes the spool stroke.

A digitally controlled current to pressure converter (CPC) is provided. A digital CPC utilizes a digital controller and an onboard pressure transducer to accurately control the output pressure based upon an input analog control signal. The digital controller includes an anti-silting algorithm that provides an impulse movement of the three-way rotary valve of the CPC to loosen and flush away silt contamination from the valve. A redundant seal stack including an intermediate passage to the hydraulic drain ensures a low pressure drop across the outboard seal minimizing the potential for leakage and improving reliability of the CPC. The digital controller also includes redundancy and fault management algorithms that enable the use of multiple inputs and feedback signals for control of the CPC. Master/slave operation and transitioning is also provided by the digital controller.

The disclosure relates to a method for operation of a position regulator for control of a pneumatic drive for an actuating member in a process installation. The position regulator has a pneumatic system with at least one nozzle/bounce-plate system, in which the bounce plates are in the form of piezo bending bars. For damped ventilation and venting of the pneumatic drive in the event of failure of the electrical power, it is proposed that the level of the electrical power supply be monitored and that, if a predeterminable limit value is undershot, the piezo bending bars of the pneumatics are adjusted via the input signals of the pneumatics such that the pneumatically controlled valves, which are subject to a characteristic, of the amplifier are open precisely just so far that a damped movement of the pneumatic actuating drive takes place to a predeterminable limit position at the desired movement speed.

The present invention relates to a hydraulic drive system having a pressure-regulated hydraulic pump for the provision of a system pressure and having a secondarily regulated hydraulic motor. In accordance with the invention, a control is provided which sets the desired system pressure during operation in dependence on an operating parameter of the hydraulic motor.

The invention discloses a series hydraulic pressure pulsation attenuator and an attenuation method. The series hydraulic pressure pulsation attenuator comprises a piston rod, a piston and an attenuator shell body; the piston rod is fixed to the attenuator shell body, one end of the piston rod is located in the attenuator shell body, and the other end of the piston rod penetrates out of the attenuator shell body; a through hole is formed in the piston rod in the axis direction and communicates with a follow-up oil line; the piston is located in the attenuator shell body, and a piezoelectric ceramic is arranged between the piston and the attenuator shell body and makes contact with the piston; the rigidity of the piezoelectric ceramic is changed by changing voltage applied to the two ends of the piezoelectric ceramic according to the magnitude of the pressure pulsation, and accordingly piston displacement is changed; and high-frequency change of the volume of the attenuator shell body and attenuation of the hydraulic pressure pulsation are achieved. According to the novel series hydraulic pressure pulsation attenuator, compared with a traditional hydraulic pressure pulsation attenuator, the oil line energy loss caused by the series hydraulic pressure pulsation attenuator is small, the bandwidth of the pressure pulsation playing an inhibition effect is increased, and the pressure pulsation in a high-pressure oil line can be inhibited.

An anti-vibration mount apparatus which suppresses vibration of a structure is disclosed. The apparatus comprises a gas spring which supports the structure, and a controller which controls an internal pressure of the gas spring. The controller comprises a primary chamber which communicates with a pressure source, a secondary chamber which communicates with the gas spring, a back-pressure chamber which communicates with the secondary chamber, a back-pressure control mechanism which has a nozzle communicating with the back-pressure chamber and a flapper facing the nozzle and controls a pressure in the back-pressure chamber via control of exhaust from the back-pressure chamber by changing a gap between the nozzle and the flapper, and a pressure control mechanism which controls a pressure in the secondary chamber via one of gas supply from the primary chamber to the secondary chamber and gas exhaust from the secondary chamber to outside caused in accordance with a pressure difference between the back-pressure chamber and the secondary chamber. The flapper has a tapered portion facing the nozzle, and the nozzle has a bore widened toward an outlet of the nozzle.