44 results about "Diaphragm seal" patented technology

The invention discloses a dual-channel oil-filled pressure core body and a preparation method, and relates to the technical field of pressure core bodies, the dual-channel oil-filled pressure core body comprises a first base assembly, a second base assembly and an integrated circuit board, the first base assembly is provided with a containing cavity and a first groove with opposite openings, and the second base assembly is provided with a second groove; the first groove is communicated with the first oil filling hole to form a first oil filling cavity; the first silicon piezoresistive chip is fixed at the bottom of the first groove, and the first diaphragm seals the opening of the first groove; the second base is provided with a second groove, the second groove is communicated with the second oil filling hole to form a second oil filling cavity, the second silicon piezoresistive chip is fixed at the bottom of the second groove, and the second diaphragm seals an opening of the second groove; the integrated circuit board is in electric signal connection with the first silicon piezoresistive chip and the second silicon piezoresistive chip through the first pin and the second pin. The dual-channel oil-filled pressure core body is simple in structure, high in measurement reliability and capable of meeting the use requirements of different scenes.

The application relates to the field of exterior wall plate building materials, and particularly relates to an ultraviolet-resistant exterior wall plate modular splicing structure, which comprises a solid wood bottom plate, the top of the solid wood bottom plate is sleeved with a transparent plate, the inside of the solid wood bottom plate is integrally provided with a mounting groove, and the mounting groove is further provided with a quick-change mechanism and a splicing mechanism; the quick-change mechanism comprises a lining plate, a manual assembly, an extension assembly and a same-direction assembly; the splicing mechanism comprises a plurality of dovetail blocks and a plurality of dovetail grooves; the ultraviolet-resistant exterior wall plate modular splicing structure seals and buckles a UV diaphragm on the surface of a soundproof plate and the lining plate, has excellent ultraviolet resistance, and further adds a sealing ring between the transparent plate and the solid wood bottom plate, so that rainwater and dust cannot enter the UV diaphragm to corrode the UV diaphragm, the waterproof performance of the UV diaphragm is remarkably improved, the service life of the UV diaphragm is prolonged, and the overall ultraviolet resistance time of the exterior wall plate is further prolonged.

The invention relates to an emergency operating device for a motor vehicle lock (1) and, in particular, a motor vehicle door lock (1). For this purpose, the device is equipped with a housing (4), at least one actuating lever (5) provided in the housing (4), and a manipulation element (8) for emergency operation. The manipulation element (8) acts indirectly or directly on the actuating lever (5) and, for this purpose, extends through a rotary element (12) mounted in the housing (4). According to the invention, the rotary element (12) is designed as a rolling diaphragm seal (12) made of an elastomeric plastic.

According to the stem cell culture solution pollution-free collection module, the sterile isolation and vacuumizing process of the internal environment of a collection bottle is achieved through a collection assembly, the function that air in the bottle is pumped out firstly and then the stem cell culture solution is injected is achieved through the coaxial inner needle and outer needle design of an infusion assembly, and the stem cell culture solution is collected through a multi-stage self-sealing structure after the needles are pulled out. And the collection bottle is automatically closed and sealed after liquid injection is completed, so that the pollution-free stem cell culture solution collection module which is pollution-free in the whole process and is closed and safe is realized. The device is characterized in that the device comprises a collecting assembly and an infusion assembly, the infusion assembly is inserted into the collecting assembly, the infusion assembly injects a stem cell culture solution into the collecting assembly, and the collecting assembly comprises a collecting bottle, a sealing plug, a disposable sterile unsealing film, a duckbill valve, a check valve and a multi-layer self-resetting diaphragm; and the sealing plug is clamped at the opening end of the collecting bottle.

The application discloses an electrolysis device and a bipolar frame structure. The electrolysis device comprises a first extrusion plate, a second extrusion plate, a diaphragm, a sealing gasket and at least one bipolar frame. The bipolar frame comprises a frame body, the frame body is formed with a chamber cavity of electrolyte, and the chamber cavity is respectively provided with an inlet part and an outlet part. The bipolar frames are arranged in a laminated manner and fixedly connected. The first extrusion plate is attached to the frame body at the first end of the laminated frame body, and the second extrusion plate is attached to the frame body at the second end of the laminated frame body. The first extrusion plate and the second extrusion plate bear opposite forces, so that the at least one bipolar frame is in airtight connection between the bipolar frames. The first side of the bipolar frame is provided with a first electrode plate, and the second side of the bipolar frame is provided with a second electrode plate. The first electrode plate and the second electrode plate are connected with a power supply and provide current for the electrolyte in the chamber cavity. The chamber cavity is further provided with a dispersion plate, and the dispersion plate shunts the electrolyte in the chamber cavity. The application improves the electrolysis efficiency and is beneficial to the escape of electrolysis gas.

Provided is a zone control valve and a fire-fighting system. The zone control valve comprises a valve body, a sealing diaphragm, and an electrical explosion driving device. A fluid flow path, comprising an inlet and an outlet, is formed inside the valve body, and the central axis of the inlet and the central axis of the outlet form an included angle; the sealing diaphragm is sealedly arranged in the fluid flow path and divides the fluid flow path into a first flow channel and a second flow channel; the electrical explosion driving device is mounted on the valve body, the output end of the electrical explosion driving device is in connection with a puncture part, and the puncture part is located in the second flow channel and directly faces the sealing diaphragm.

The utility model discloses a diaphragm sealing structure of a valve core, which comprises a valve seat provided with an accommodating cavity, a working port and a flow channel; the working port is located below the containing cavity and communicated with the containing cavity, and the flow channel is communicated with the containing cavity. The valve element is arranged in the containing cavity, and the valve element can move up and down so as to have the position where the working opening can be opened or closed. The elastic diaphragm is located above the containing cavity, the inner end of the elastic diaphragm is connected with the peripheral side of the valve element in a sealed mode, the outer end of the elastic diaphragm is connected with the valve seat in a sealed mode, the elastic diaphragm can elastically deform to move along with the valve element, and the sealing effect is always kept. The utility model relates to the technical field of electromagnetic valves.

The application discloses a diaphragm pump, which comprises a pump shell body internally provided with a containing cavity, an electromagnet assembly, an intermediate shell body, a diaphragm, an isolation shell body internally provided with an isolation cavity and a switch valve structure, the electromagnet assembly comprises an electromagnet fixedly arranged in the containing cavity and an oscillating rod, the intermediate shell body is provided with an independent suction cavity, a transfer cavity and a discharge cavity, the suction cavity is provided with a first suction passage communicated with the containing cavity and a second suction passage communicated with the transfer cavity, the discharge cavity is provided with a first discharge passage and a second discharge passage, the first discharge passage is communicated with the transfer cavity, the diaphragm is sealingly arranged in a communicating port of the side wall of the transfer cavity, the diaphragm is connected with the oscillating rod, the switch valve structure is arranged in the intermediate shell body, the isolation cavity is internally provided with an air inlet passage and an air outlet passage, the air inlet passage is communicated with the containing cavity, and the air outlet passage is communicated with the second discharge passage. Through the above structure, the noise generated during the operation of the diaphragm pump can be weakened, and the diaphragm pump can operate more quietly.

The utility model discloses a pressure switch, which comprises a plug and a lower seat, the plug and the lower seat are spliced to form a closed movable cavity, the inner wall of the movable cavity is provided with a first ring groove, the first ring groove is covered with a sealing diaphragm, one side of the sealing diaphragm is provided with a pushing piece, the other side of the sealing diaphragm is provided with a switch assembly, and the inner wall of a sliding cavity is provided with a second ring groove. A limiting ring covers the interior of the second annular groove and is made of a hard material, and the side, facing the pushing piece, of the limiting ring abuts against the sealing diaphragm; a third ring groove is formed in the inner wall of the movable cavity, when the third ring groove is subjected to cold extrusion forming, the side, facing the limiting ring and back on to the sealing diaphragm, of the third ring groove is wrapped to form a ring edge, the ring edge abuts against and fixes the limiting ring, and the heat shrinkage rate of the limiting ring is obviously lower than that of a traditional plastic plug. The ring edge wraps and fixes the limiting ring, it is ensured that the limiting ring exerts stable pressing force on the sealing diaphragm, and the sealing performance of the sealing diaphragm is improved.

The utility model provides a kind of elastomer diaphragm seal, including static ring component and dynamic ring component, static ring component includes static ring and sealing ring, static ring outer wall is equipped with sealing groove, sealing ring is nested in sealing groove, dynamic ring component includes support ring, diaphragm ring cover, snap ring, spring, base and dynamic ring, support ring inner wall is equipped with convex ring, diaphragm ring cover upper end bottom surface and convex ring top surface abut, diaphragm ring cover lower end is equipped with clamping groove, snap ring is installed in clamping groove, spring top and support ring bottom abut, spring bottom and base are connected, dynamic ring is installed in support ring inside, dynamic ring bottom surface and diaphragm ring cover top surface abut, dynamic ring top surface and static ring outer end surface cooperation form sealing surface, to realize the function of preventing fluid leakage.The utility model diaphragm ring cover has good deformation recovery ability, can closely adhere dynamic ring, carry out elastic compensation when small stroke change of seal is generated, and spring can further stretch in large stroke change, and sealing performance, stability and reliability are higher.

The invention relates to the field of glue coating equipment, and particularly discloses a glue cut-off control valve body and a working method thereof, and the glue cut-off control valve body comprises a valve block assembly, a valve sleeve, a feeding ejector pin, a material valve nozzle, a valve core, a shifting piece, a compression spring and an air pipe joint. The feeding ejector pin is of an integral cylinder structure and is arranged in the valve sleeve provided with the double sealing rings and the intermittent gasket in a penetrating mode, and a double-sealing cavity is formed. The valve element is connected with the feeding ejector pin through the shifting piece to form a lever type pneumatic force transmission structure, opening and closing actions are achieved under air pressure driving, and the valve element is automatically reset and closed through a compression spring in the valve element when air is cut off. According to the structure, a traditional diaphragm sealing mode is omitted, the problem that the valve needle is opened by mistake due to reverse thrust generated by diaphragm deformation under high pressure is solved, sealing reliability and opening and closing stability are improved, and the structure has the advantages of being capable of being automatically closed when gas is cut off, preventing drip leakage, being resistant to high pressure and the like and is suitable for a glue control system under high-viscosity, high-pressure and multi-point gluing working conditions.

A filter plate assembly for a filter press, comprising a filter frame and a filter plate supported on the filter frame. A diaphragm is provided between the filter frame and the filter plate, the diaphragm further comprising, on a side facing the filter frame, a seal bead for sealing the diaphragm against the filter plate. The seal bead comprises a first seal lip and a second seal lip, the former being elevated from the later. The filter frame has a limited vertical travel with respect to the filter plate, such that, in a lowermost position, only the first seal lip is in contact with the filter plate, and in an uppermost position, both the first seal lip and the second seal lip are in contact with the filter plate.

The frost crack prevention water mixer comprises a water mixing channel shell and a frost crack prevention mechanism, the water mixing channel shell is provided with a cold water inlet, a hot water inlet, a water mixing cavity, a pressure relief opening and a plurality of water outlets, and the cold water inlet, the hot water inlet, the pressure relief opening and the water outlets are all communicated with the water mixing cavity; the frost crack prevention mechanism comprises a fixing block, a diaphragm and an elastic piece, the fixing block and the diaphragm are fixedly connected to the pressure relief opening, the diaphragm seals the pressure relief opening, one end of the elastic piece abuts against the fixing block, the other end of the elastic piece is fixedly connected with a cushion block, and the elastic piece is used for driving the cushion block to move in the direction away from the fixing block so that the cushion block can abut against the diaphragm. According to the frost crack prevention water mixer, the expansion volume of ice can be absorbed, and the possibility that the water mixing channel shell and the valve are cracked and damaged is reduced.

The utility model discloses a fluorine lining diaphragm valve, which belongs to the technical field of diaphragm valves, and is characterized in that the fluorine lining diaphragm valve comprises a valve body, a valve cover and a diaphragm sealing gasket, the valve cover is rotatably connected with a hand wheel, the fluorine lining diaphragm valve is further provided with a valve rod structure, the valve rod structure comprises a screw rod, a driving rod and a reinforcing block, the screw rod is in threaded connection with the hand wheel, and the screw rod and the driving rod are connected through a box body; a first moving block, a second moving block, a spring and other parts are arranged in the box body, the top surface of the first moving block and the top surface of the second moving block are obliquely arranged, and buffering pieces are arranged on the sides, away from each other, of the first moving block and the second moving block, so that the screw rod can drive the first moving block and the second moving block to extrude the corresponding buffering pieces; the spring is arranged between the screw rod and the driving rod and is connected with the screw rod and the driving rod; the reinforcing block is embedded in the diaphragm sealing gasket, and the driving rod penetrates through the diaphragm sealing gasket to be connected with the reinforcing block, so that the effects of enhancing the stability and the sealing performance of the fluorine-lined diaphragm valve, improving the use performance and prolonging the service life are achieved.

The precise three-way backwash valve is used for solving the problem that in the prior art, due to the fact that a driving system is complex, the opening synchronism of a water inlet and a sewage discharging plug is poor, and comprises a valve body, the water inlet is formed in one end of the valve body, a filtering opening is formed in the other end of the valve body, the sewage discharging opening is formed in the bottom of the valve body, and a detachable valve cover is arranged at the top end of the valve body. A sealing diaphragm is arranged in the valve body, the sealing diaphragm and the valve cover form a driving bin, a driving device is arranged in the driving bin, a supporting partition plate is arranged in the valve body, the top end of the supporting partition plate is an arc-shaped concave face, the top end of the supporting partition plate can be matched with the sealing diaphragm to seal the water inlet, and a connecting piece is fixed to the bottom face of the sealing diaphragm. The connecting piece is located on the side, close to the filtering opening, of the supporting partition plate and hinged to a connecting rod, and a sewage discharging plug is hinged to the bottom end of the connecting rod. The sealing diaphragm is matched with the connecting piece and the connecting rod to synchronously drive the pollution discharge plug to move, so that the movement synchronism of the sealing diaphragm and the pollution discharge plug is ensured.

A combination electrode includes a working electrode, a reference electrode, a hydrogel diaphragm, an outer tube and an inner tube. The working electrode is disposed in the inner tube. The reference electrode is disposed in a reference chamber formed between the inner tube and the outer tube. The hydrogel diaphragm seals the opening between an end of the outer tube and the inner tube when the hydrogel swells upon coming in contact with a first electrically conductive fluid that is introduced into the reference chamber. The diaphragm is coupled to the reference electrode in an electrically conductive manner through the first electrically conductive fluid, which contacts both the reference electrode and the diaphragm. The inner tube is closed by a glass membrane that is coupled to the working electrode in an electrically conductive manner through a second electrically conductive fluid that contacts both the glass membrane and the working electrode.

An ultrasonic surgical instrument includes a handpiece casing and an electromechanical transducer assembly disposed inside the handpiece casing, where the transducer assembly includes a front driver and the transducer assembly has a longitudinal axis. A probe is operatively connected to the front driver at an acute angle to the longitudinal axis of the transducer assembly. A sheath surrounds the probe and is connected at a proximal end to the handpiece casing. The sheath is attached to the casing by a twist quick release coupling. A diaphragm seal inside the proximal end of the sheath blocks liquid irrigant in a cylindrical space between the sheath and the probe from penetrating proximally of a port feeding irrigant to the space. The front driver is geometrically configured to enable an angled connection of probe to handpiece proximate a nodal plane.

The utility model discloses a diaphragm sealing piece processing device, which belongs to the field of diaphragm sealing piece production, and comprises a box body driving piece, a lower combining block driving piece is arranged on the box body driving piece, and an annular lower blade driving piece and a cylindrical bulge driving piece are arranged at the top of the lower combining block driving piece. A first through hole driving piece is arranged on the cylindrical protrusion driving piece. A driving piece is arranged above the lower closing block driving piece, an output shaft driving piece of the driving piece is connected with an upper closing block driving piece in a sleeving mode, the upper closing block driving piece is of a hollow structure, and a second through hole driving piece is arranged at the bottom of the upper closing block driving piece; when the annular upper blade and the annular lower blade are matched to complete edge cutting, the punching rod punches the top of the diaphragm sealing piece, the machining steps and time are greatly reduced, machining of more diaphragm sealing pieces can be completed within a short time, and the overall production efficiency is improved.

This application relates to the field of speaker equipment technology and discloses a behind-the-ear composite conductive headphone, comprising: a shell having a first side and a second side for fitting against a human ear; an opening on the first side for communicating with the ear canal of the human ear; a vibrating diaphragm sealed on the opening; a vibrating structure fixedly connected to the interior of the shell; a controller fixedly connected to the shell via a connecting tube; a transmission line inside the connecting tube, the controller being electrically connected to the vibrating structure via the transmission line; and a mobile power supply electrically connected to the transmission line within the controller. This design solves the problem of poor wearing experience in existing headphones.

The application relates to the technical field of medical containers, in particular to a medical solid-liquid separation packaging container; the packaging container comprises an upper container and a lower container connected to the lower part of the upper container; the upper container and the lower container are both tubular; the upper end and the lower end of the upper container are both open; the upper end of the upper container is fixedly connected with a sealing film; the lower part of the middle of the upper container is fixedly connected with a baffle ring; the center of the baffle ring is sealed through a diaphragm; solid medicine is arranged in the upper container; the upper end of the lower container is open; the upper end of the lower container is fixedly connected with a film starting piece; the upper end of the lower container is movably and sealingly connected to the lower port of the upper container; the diaphragm separating the solid medicine and the liquid medicine is punctured through the film starting piece, so that the liquid medicine in the lower container enters the upper container, and the solid medicine in the upper container is poured into the mouth of a patient through the upper end of the upper container, and the problem that the traditional solid medicine and the liquid medicine are separately taken and cause pain or poor experience is solved.

The bolt torque fastening method for the pneumatic valve diaphragm comprises the steps that the thickness of the diaphragm before fastening is measured, and the original thickness of the diaphragm is obtained; based on the original thickness of the diaphragm, performing fastening and compression ratio calculation on the diaphragm to obtain the compression ratio; when the compression ratio reaches a preset compression threshold value, recording the fastening torque value at the moment and correcting the fastening torque value to obtain a corrected fastening torque; determining a preliminary fastening torque, a final fastening torque, a preliminary re-tightening torque and a final re-tightening torque based on the corrected fastening torque; carrying out primary symmetrical fastening on the bolt of the diaphragm by using the primary fastening torque; the bolt of the diaphragm is symmetrically fastened for the second time through the final fastening torque; performing primary circumferential re-tightening on the bolt of the diaphragm by using the primary re-tightening torque; and after the first-time circumferential re-tightening is completed, waiting for a preset time length, and performing second-time circumferential re-tightening on the bolt of the diaphragm by using the final re-tightening torque. By means of the method, the long-term reliability of diaphragm sealing is improved, and the service life of key components is prolonged.

Fluid connectors assemblies that provide neutral fluid displacement are disclosed. A fluid connector assembly may include first member and a second member. A deformable sleeve is located on a post of the second member. A septum is located on an opening of the first member. The first member and the second member each include an opening. The sleeve can seal off the opening of the post from fluid entry. However, when the post of the second member is inserted into the first member, a septum of the first member displaces a sleeve of the second member, causing the sleeve to uncover the opening. Further, the septum seals each of the first member and the second member and the displaced sleeve forms a fluid path through the first and second member, with the sleeve regulating fluid flow.

The invention relates to an emergency actuation device for a motor vehicle lock (1) and in particular a motor vehicle door lock (1). For this purpose, the device is equipped with a housing (4), and furthermore with at least one actuating lever (5) provided in the housing (4), and with a manipulation element (8) for emergency actuation. The manipulation element (8) acts directly or indirectly on the actuating lever (5) and to this end engages through a rotary element (12) mounted in the housing (4). According to the invention, the rotary element (12) is designed as a rolling diaphragm seal (12) made of an elastomeric plastic.

This utility model relates to a breather valve with online adjustable discharge pressure, belonging to the field of valves. It includes a valve body and a valve disc. The valve body has an inlet, an exhalation outlet, and an inhalation outlet. The valve disc consists of an exhalation valve disc and an inhalation valve disc. The exhalation outlet has an exhalation valve seat that cooperates with the exhalation valve disc, and the inhalation outlet has an inhalation valve seat that cooperates with the inhalation valve disc. The inlet has a flange for connection to a pressure vessel. Its key feature is that the exhalation valve disc consists of a diaphragm sealing gasket and a water injection chamber. The diaphragm sealing gasket is sealed on the lower end face of the water injection chamber and cooperates with the sealing surface of the exhalation valve seat to form an exhalation sealing pair. A water injection pipe is provided on the upper end face of the water injection chamber, and water is injected into the inner cavity of the water injection chamber. A guide device is provided between the outer circumference of the water injection chamber and the valve body. By controlling the amount of water injected into the water injection chamber, the exhalation pressure can be set and adjusted, offering advantages such as accurate exhalation pressure setting and high online exhalation pressure adjustment precision.

The application relates to the technical field of diaphragm valves, and particularly discloses a replaceable diaphragm sealing assembly structure and a diaphragm valve, which comprises a sealing ring, a center hole is arranged through the sealing ring, annular grooves are arranged on the two sides of the sealing ring, the annular grooves are located outside the center hole, a connecting hole is arranged on the sealing ring and used for connecting the two annular grooves, so that medium in one of the annular grooves can flow into the other annular groove through the connecting hole, an upper valve pad is fixedly arranged on one side of the sealing ring and located outside the center hole, and a diaphragm is arranged on the side of the sealing ring close to the upper valve pad, the edge of the diaphragm is fixedly connected with the sealing ring, and the diaphragm is elastic so that the diaphragm can abut against the upper valve pad after being stressed. The application can replace the valve pad while retaining the valve body.

The utility model relates to fluid control and valve technical field, and disclose a diaphragm type pressure reducing valve, including the valve body and install in the valve cover of valve body one side, the elastic diaphragm sealing connection through between valve body and valve cover. The utility model discloses through the collaborative design and reinforced seal structure of "elastic diaphragm - pressure regulating mechanism", completely solve the problem of traditional pressure reducing valve "pressure regulating inaccuracy, leakage is serious ". Automatic pressure regulating, elastic diaphragm divides the device into the pressure relief chamber and pressure regulating chamber, when the pressure relief chamber pressure rises, pressure promotes the diaphragm to left deformation, drives the lower compression plate pressure regulating spring, and then drives the valve plate to rotate around the hinge point and presses the valve element, and blocks the air inlet channel, when the pressure drops, pressure regulating spring springback promotes the diaphragm reset, and the valve element opens the air inlet under the action of reset spring, forms "pressure - deformation - valve action" closed loop automatic regulation, and the pressure deviation can be controlled within after pressure reduction ±0.02MPa, and the precision of traditional pressure reducing valve is improved 60%.

Machine tool (100) for machining, in particular for repairing, a diaphragm seal (50) of a flange (51), which in the assembled state has a diaphragm plate (52) that is fixed to a sealing surface of the flange (51) by means of a weld (53), with a frame (54) comprising a stationary part (55) and a movable part (56), wherein the stationary part (55) is designed for the direct or indirect mounting of the machine tool (100) on the flange (51) and a tool carrier (57) is arranged on the movable part (56), characterized in that the tool carrier (57) is designed as a tool adapter (571) for receiving different tools (58) and the frame (54) has several axes (591, 592, 593, 594) that define a machining area (60), each designed as a linear guide (61) and via several movable carriages (621, 622,623) are aligned and connected to each other in such a way that the tool adapter (571) can be moved along any three-dimensional trajectory within the machining space (60) when mounted on the machine tool (100).

This pump comprises: a piston that slides inside a cylinder so as to reduce or increase the volume of a pump chamber provided on a flow path through which a fluid flows as a transfer target; an O-ring that is provided on the outer circumferential surface of the piston and blocks a gap formed with respect to the inner circumferential surface of the cylinder; a diaphragm seal that is provided outside the pump chamber as compared to the O-ring, and prevents the fluid leaked out of the O-ring from further leaking to the outside; and a recirculation path that recirculates, to the upstream side of the flow path upstream from the pump chamber, the fluid leaked out of the O-ring. One end of the recirculation path facing the cylinder is provided with an opening on the pump chamber side with respect to the diaphragm seal in the sliding direction of the piston.

The present invention relates to a fluid shutoff device (1) comprising: a valve body (2); said valve body (2) at least partially delimiting an inlet conduit (3) and an outlet conduit (4); said inlet conduit (3) having a predetermined transverse inlet conduit dimension (Di); said valve body (2) comprising an intermediate portion (5); said intermediate portion (5) at least partially delimiting an intermediate chamber (6); said intermediate chamber (6) providing a fluid connection between said inlet conduit (3) and said outlet conduit (5); wherein said inlet conduit (3) comprises an inlet conduit connection edge (7) formed by the intersection between said intermediate portion (5) and said inlet conduit (3); said intermediate chamber (6) comprising a sealing surface (14); said intermediate chamber (6) housing a diaphragm (8); said diaphragm (8) having a one-piece body;said diaphragm (8) comprises a diaphragm sealing portion (9); said diaphragm sealing portion (9), in the closed position of the inlet conduit (3), cooperates, by means of a diaphragm support surface (20), with said sealing surface (14) to occlude said inlet conduit (3); said diaphragm (8) comprises a diaphragm flexing portion (10); said diaphragm flexing portion (10) permanently connects the diaphragm sealing portion (9) to the valve body (2) to operate exclusively under flexing; said diaphragm sealing portion (9) delimits a diaphragm seat (11); said fluid shutoff device (1) further comprises a control element (12); said control element (12) comprises a control stem (13) comprising a predetermined transverse control stem dimension (Dp); said control stem (13) is integrally received in said diaphragm seat (11);said control stem (13) transmits a movement to said sealing portion of the diaphragm (9) at least between said inlet duct closing position (3) and an inlet duct opening position (3), moving along a predetermined direction of diaphragm movement (XX); wherein said sealing surface (14) is a flat sealing surface positioned orthogonally to said predetermined direction of diaphragm movement (XX); and wherein said diaphragm support surface (20) is a flat support surface positioned orthogonally to said predetermined direction of diaphragm movement (XX);and wherein said transverse dimension of the control stem (Dp) is between a value greater than said transverse dimension of the inlet duct (Di) and a dimension (Dg) that leaves a distance, measured in a plane orthogonal to said predetermined direction of diaphragm movement (XX), between said control stem (13) and said connection edge of the inlet duct (7), less than 25% of the transverse dimension of the inlet duct (Di).;

The invention provides a simulation experiment device for tire burst of a fuel cell automobile, which is characterized in that a plurality of air leakage holes are formed in a hub, the hub is connected with an air chamber through an air pipe interface, a rubber diaphragm and a spring assembly are mounted in the air chamber, and the diaphragm seals an exhaust channel under the action of a first-stage spring. After the electromagnetic valve receives a control signal, the pressure relief plunger in the electromagnetic valve completes displacement under the action of the secondary spring, so that the air chamber is communicated with the atmosphere, pressure difference is formed instantly, the diaphragm opens the exhaust channel quickly under the action of the pressure difference, and gas in the tire is exhausted quickly through the exhaust channel, so that the tire burst simulation effect is realized. A high-speed slip ring is introduced into an electromagnetic valve control circuit, and stable transmission of power supply and control signals is achieved. The system has the beneficial effects that by means of the multi-channel air leakage and pilot electromagnetic valve control mode, instantaneous sudden air pressure drop can be achieved, and the safety and stability of the exhaust process can be guaranteed; due to the design of the high-speed slip ring, the device can still keep good control response in a vehicle driving state.