67results about How to "Large pressure range" patented technology

The invention discloses a resistor-type pressure sensor and a making method thereof. The resistor-type pressure sensor is composed of a sensitive layer and two substrates containing electrodes. The sensitive layer is disposed between the two electrode layers. The sensor is characterized in that the sensitive layer is a conducting porous elastic film. Since the sensitive layer of the sensor provided by the invention adopts the conducting porous elastic film, when the film is pressed, the deformation of the film increases, the contact resistance of the conducting material in the film is reduced, the sensitivity of the pressure sensor to pressure is enhanced and the pressure sensing range of the pressure sensor is enlarged. The film is made of material at a low cost, and processing technique is simple, so that the cost of the pressure sensor is reduced.

The invention relates to a device for the enrichment of a liquid stream with a gas, comprising a flow mixer (14) with a venture nozzle (36), having a rotationally symmetrical contraction (40) with a diameter D and being flown through axially by the liquid stream. The invention further comprises a gas feed for the lateral feed of the gas into the contraction (40) of the venture nozzle (36). The gas feed comprises at least one gas channel (54, 54′) with a diameter d<0,5*D, ending laterally in the contraction (40) of the venture nozzle (36) in a way, such that the elongated longitudinal axis (56, 56′) thereof is tangential to an imaginary cylinder surface (58), which is coaxial to the contraction (40) and comprises a diameter D′>d.

A side door opening/closing mechanism for a hypersonic velocity wind tunnel test section. Hydraulic cylinders and springs act on a side door together to make the side door move in the direction perpendicular to a door frame so as to ensure that the side door and the door frame are sealed. A motor and a ball screw act on the side door together to make the side door move in the horizontal direction so as to open or close the side door. When positive pressure exists in the hypersonic velocity wind tunnel test section, pressing force applied on the side door is provided by the hydraulic cylinders, and the number and specification of the hydraulic cylinders can be adjusted according to the value of the pressure in the hypersonic velocity wind tunnel test section so that the side door opening/closing mechanism can be adapted to a wide pressure-bearing range; when the inside of the hypersonic velocity wind tunnel test section is in a vacuum state, the hydraulic cylinders push the side door so that the side door can be attached to the side door frame, quite high pressing force is not needed, and the side door can be sealed through self suction. The side door opening/closing mechanism is wide in pressure-bearing range and capable of realizing both internal pressure seal and vacuum seal, thereby meeting operating requirements of the hypersonic velocity wind tunnel test section and being capable of being popularized to other equipment for use.

The invention relates to a method and a device for measuring interfacial shearing strength under the connection of a disc and a flat plate. The method comprises the following steps: A, the flat plate slides relative to the static disc at a speed u, with the slide-roll ratio being 2; B, the measured lubricating oil is fed to a line contact area, so as to form the hydrodynamic lubrication in the line contact area, and load is applied between the disc and the flat plate to ensure that the maximum Hertzian contact pressure of the line contact is larger than 0.4GPa; and C, the friction coefficients of the contact surface of the disc or the flat plate under the load are measured twice, and the binary linear equations for the friction coefficients of the contact surface are solved. By using the method and the device, the invention has significant technical effect and has the advantages of larger pressure measurement range of lubricating oil, simple and compact structure, easy implementation, lower manufacturing and servicing cost, easy measurement and higher measurement accuracy; moreover, the device of the invention is capable of measuring the shearing strength parameters of two interfaces at the same time, therefore, the invention is of significant practical value. The device of the invention can substitute for the high-pressure chamber measurement device and other measurement devices.

The heat exchanger (1) contains a jacket element (2) and an insert element (3), wherein the insert element (3) is arranged in the operating state in the interior of the jacket element (2). The insert element has a longitudinal axis (4). The insert element (3) contains an insert jacket element (31) and a plurality of web elements (9, 10), the web elements (9, 10) having a first end (13) and a second end (14). The first end (13) and the second end (14) of each web element (9, 10) are connected to the insert jacket element (31) at different locations. At least a portion of the web elements (9, 10) includes web element channels (11, 12), the web element channels (11, 12) extending from the first end (13) of the web element (11) to the second end (14) of the web element (11). An intermediate jacket element (5) is arranged between the insert jacket element (31) and the jacket element (2).

The invention discloses a double-acting magneto-rheological pressure and flow control valve which comprises an upper end cover and a lower end cover. The upper end cover and the lower end cover are arranged in a longitudinal symmetry manner, and a thrust shaft is slidably connected into a cavity formed between the upper end cover and the lower end cover; two cavities are formed in rooms among two ends of the thrust shaft, the upper end cover and the lower end cover, and an upper flow control cavity and a lower flow control cavity are respectively mounted in the two cavities; the upper end cover is fixed to the lower end cover by a piston, an upper auxiliary damping hole and a lower auxiliary damping hole are respectively machined on the upper end cover and the lower end cover, and an auxiliary channel which is communicated with the damping holes is arranged in an inner ring of the piston; and the opening of the auxiliary channel is determined by the sliding stroke of the thrust shaft. The double-acting magneto-rheological pressure and flow control valve has the advantages of high response speed and extremely wide bearing pressure range owing to fast yield strength variation response and wide range of magneto-rheological fluid. Besides, the double-acting magneto-rheological pressure and flow control valve is simple and compact in structure, convenient to manufacture and high in portability, and can be connected into an electronic control unit, so that a bidirectional flow can be intelligently and steplessly controlled.

Minimum pressure valve having a housing (13) with an inlet (14) and an outlet (15) and in which has been provided a valve body (21) which is pushed against a seating (30) round the inlet (14) in a closed position, and whereby the valve body (21) is situated at a distance from the above- mentioned seating (30) in an open position, such that the inlet (14) is connected to the outlet (15), whereby the valve body (21) is provided in a sliding manner in a valve casing (17) confining, together with the valve body (21) an inner space (36) that is connected to the inlet (14) via a duct (35).

The invention provides a spring tube digital compression gauge based on a Hall effect. The spring tube digital compression gauge comprises a pressure sensing element, a signal conditioning circuit, a microcomputer, an analog-to-digital converter, a display screen, a button, a power supply and a joint. The pressure sensing element comprises a spring tube, a magnet, and a Hall element. One end of the spring tube is provided with the joint which is connected with a pressure source, and the other end is enclosed as a free end. A blind end is connected with a magnet support which is installed with the magnet. An upper part of the joint is installed with a Hall element support which is installed with the Hall element. An induction surface of the Hall element directly faces the magnet and is close to the magnet. An output terminal of the Hall element is connected with an input terminal of the signal conditioning circuit. An output terminal of the signal conditioning circuit is connected with the microcomputer and the analog-to-digital converter. The microcomputer is connected with the display screen and the button. The pressure sensing element is installed in a shell of the gauge. A bottom of the spring tube is connected with the power supply. The compression gauge has auxiliary functions of unit switching, zero point calibration, non-linear compensation, temperature compensation and the like, precision is high, a life is long, a measuring range is large, and cost is low.

The invention discloses an ultrahigh pressure testing system and a control method thereof. The ultrahigh pressure testing system comprises a liquid box, a first control valve and a servo supercharger. The liquid box is connected with the first control valve and the servo supercharger in sequence. The servo supercharger is connected with a pressure testing device. A second control valve is connected between the servo supercharger and the pressure testing device. A first pressure detection module is arranged between the first control valve and the second control valve. A second pressure detection module is arranged between the pressure testing device and the second control valve or in the pressure testing device. The technical purpose of the invention is to provide the ultrahigh pressure testing system which uses the servo supercharger as a power source to ensure high precision and high pressure of medium pressurization and intelligently control the pressure rising/reducing rate, and provide the control method of the ultrahigh pressure testing system to realize automatic control in the pressure testing process.

The invention discloses a wide head rotor of a high vacuum displacement pump. In an existing cam pump technology, seal between a pump body and a rotor is linear pump, and therefore, vacuum capacity is easily caused to drop after the rotor and the pump body are worn. The end surface of the wide head rotor of the high vacuum displacement pump is of an axisymmetric structure, and a 1/4 molded line of the end surface consists of three parts: a top end wide head circular arc AB, a transition curve BD and an intermediate circular arc DE, and the rotor is formed by wrapping a metal framework and rubber; and the top end wide head circular arc AB and the intermediate circular arc DE of the wide head rotor are two conjugate curves. The wide head rotor effectively increases a working pressure range of the high vacuum displacement pump, ensures lasting stability of conveying pressure, reduces pulsation and improves working efficiency.

The invention discloses an urban pipeline mobile cleaning device. The urban pipeline mobile cleaning device is composed of a power device, a high-pressure water device, a wheel type moving trolley driven by a miniature servo motor, and a post-processing device. The urban pipeline mobile cleaning device comprises a power system, a water jet flow system, a siphon system, a sealing system, a controlsystem, a line receiving and releasing mechanism, and a sewage disposal system. The control system is adopted to control the trolley to move in a pipeline according to a preset track. During moving, high-pressure water is conveyed to the water jet flow system by the high-pressure water device. An eccentric rotating high-pressure nozzle is adopted to the high-pressure water jet flow system to stirup sludge deposited at the bottom of the pipeline and fluidizes the sludge. The siphon system is adopted to convey the fluidized sludge to the post-processing device outside the pipeline for processing until all sludge in the pipeline is cleared. The structure is simple and compact, the manufacturing cost is low, and pipeline cleaning efficiency and the automation degree are greatly improved.

A control valves for a servo steering system, having an inlet for supplying a hydraulic liquid at a first pressures and an outlet for discharging the hydraulic liquid into a region having a smaller, second pressure, especially into a pressureless reservoir. The control valve has a guide and a valve slide accommodated in the guide so as to be movable therein along an axis. The valve slide is acted upon on one side by the hydraulic liquid with the first pressure and on the opposite side by a defined supporting force. An opening structure is provided on at least one of the valve slide and guide. A cover corresponding to the opening structure is provided on the other of the guide and valve slide. A movement of the valve slide relative to the guide effects a change of a free passage area of the opening structure that is not closed off by the cover, whereby the hydraulic liquid is able to flow from the inlet, through the free passage area, to the outlet. The opening structure has a defined shape such that the free passage area of the opening structure does not depend linearly on the movement of the valve slide

The invention relates to a method for measuring interfacial shear strength under full plastic contact of discs and a flat plate, which comprises the following steps of: A, making a disc still and the flat plate slide with the speed mu relative to the disc, wherein the rolling-sliding ratio is 2; B, supplying measured lubricating oil to a linear contact area to ensure that the hydrodynamic pressure lubrication is formed in the linear contact area, and applying a load between the disc and the flat plate to ensure that the maximum hertzian contact pressure of linear contact is more than 0.4GPa; and C, needing two discs with different contact surface hardnesses if the single measurement is to be finished, performing the loading on contact surfaces of the two discs and the flat plane respectively, measuring friction coefficient values on contact surfaces of the discs or contact surfaces of the flat plate under loading contact of the two discs and the flat plate respectively, and solving a binary linear equation group about the friction coefficients of the contact surfaces to obtain ts0 and an alphas value. The adoption of the method and a device thereof has remarkable technical effect, and has the advantages of larger pressure range of the measured lubricating oil, simple and compact structure, easy realization, lower manufacturing cost and using cost, easy measurement, higher measurement accuracy and the like.

The present invention provides an improved elastomeric composition that includes from about 0.01 to about 0.5 weight percent of a polyorganosiloxane or a combination of polyorganosiloxanes.

The invention provides a three-dimensional adjustable high-pressure-bearing high dynamic water grouting system and a testing method. The three-dimensional adjustable high-pressure-bearing high dynamicwater grouting system comprises a model cabin frame, a loading system, a grouting system, a dynamic water system and a monitoring system. The model cabin frame is composed of an upper plate, a lowerplate, a left plate, a right plate, a front plate and a rear plate; the upper plate and the lower plate are composed of a plurality of first basic modules, the left plate and the right plate are composed of a plurality of second basic modules, and the front plate and the rear plate are composed of a plurality of third basic modules; the model cabin frame is used for being filled with a geomaterial, and the size of the filling space is adjustable. The loading system is used for simulating the stress condition in a pressure-bearing state at a preset burial depth. The grouting system is used forcarrying out a grouting test on the geomaterial in the model cabin frame. The dynamic water system is used for injecting water into the geomaterial in the model cabin frame to simulate dynamic water with a preset pressure and a preset flow. The monitoring system is used for monitoring the stress condition of the geomaterial in the model cabin frame, the internal pore water pressure and the water flow information.

The invention discloses a double-symmetric parallel film micro-constant flow valve and a flow regulation and control method. The double-symmetric parallel film micro-constant flow valve comprises twocontrol flow channels which are separately arranged up and down, two control flow channels which are arranged left and right, a fluid main flow channel, a narrow flow channel and four elastic films which are parallel in pairs. The inlets of the four control flow channels communicate with the fluid main flow channel, and the outlets of the control flow channels are sealed by the elastic films and are separated from the narrow flow channel. According to the flow regulation and control principle of the double-symmetric parallel film micro-constant flow valve, the four elastic films are used for generating elastic deformation under the action of the pressure of microfluid in the control flow channels, the microfluid in the narrow flow channel is extruded, the flow resistance of the valve is changed so as to compensate the change of the pressure intensity of the fluid in real time, and finally constant regulation and control of the flow of the microfluid are realized. According to the valve, the driving pressure intensity required for realizing constant flow regulation and control is small (less than 20kPa), the output flow range is wide, and the valve has wide application value in thefields of medicine injection, integrated microchip laboratories, portable instant detection instruments and the like.

The invention discloses an electrical device. The electrical device comprises a power semiconductor element, a driving module, one or more first conductive blocks and one or more elastic structures, wherein a control electrode and a current electrode of the power semiconductor element are annularly arranged, the control electrode is arranged on the annular outer ring, and the current electrode isarranged on the inner ring; the driving module comprises one or more switch elements, and is used for driving the power semiconductor element; the one or more first conductive blocks are arranged on one side of the power semiconductor element, and are used for providing connection from the switch elements to the current electrode; and the elastic structures comprise bases, auxiliary elastic piecesand springs. The electrical device has the characteristics of small commutation circuit area, low commutation circuit stray inductance and high commutation speed, the elastic structures in the electrical device provide pressure for the contact surface between the conductive blocks and a circuit board, the contact resistance is decreased, and the upper limit of the pressure borne by the surfaces of the switch elements can be limited.