Pressure limiting valve, mechanical equipment, safety air bag and vehicle

Abstract

The pressure limiting valve is used for the mechanical equipment and comprises a body, a valve plate and a push rod, the body is provided with an air inlet channel, an air outlet channel, a mounting hole and a pressure adjusting hole, a valve port is formed in one end of the air outlet channel and communicates with the air inlet channel, and the mounting hole and the pressure adjusting hole communicate with the air outlet channel and the external space of the body; the valve plate is connected with the body; the push rod penetrates through the mounting hole from the outer part of the body, extends out of the valve port to abut against the valve plate, and is provided with a central hole which is through along the axial direction of the push rod; the push rod is used for sliding in the mounting hole according to the air pressure change of the external space at the pressure regulating hole, and when the air pressure of the external space at the pressure regulating hole is larger than or equal to a preset value, the push rod is separated from the valve plate, the air inlet channel is communicated with the center hole, and the problem that rear-end equipment is damaged when sealing of a valve port of the pressure limiting valve fails is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of air source processing components, in particular to a pressure limiting valve, mechanical equipment, a safety airbag and a vehicle. Background Art

[0002] At present, the pressure limiting valve is a valve that reduces the inlet pressure to a required outlet pressure through regulation and relies on the energy of the medium itself to automatically maintain a stable outlet pressure. Normally, the pressure at the rear end of the valve port of the pressure limiting valve is relatively stable. However, when the valve port cannot be completely sealed for some reason, the pressure at the rear end of the valve port will be higher than the design pressure. When the increased pressure at the rear end of the valve port exceeds the limit that the back-end equipment can withstand, it will cause serious damage to the back-end equipment. Utility Model Content

[0003] The utility model aims to provide a pressure limiting valve, mechanical equipment, a safety airbag and a vehicle, which solves the problem of damaging rear-end equipment when the valve port seal of the pressure limiting valve fails.

[0004] In order to achieve the purpose of the utility model, the utility model provides the following technical solutions:

[0005] In the first aspect, the utility model provides a pressure limiting valve, comprising: a main body, provided with an air inlet channel, an air outlet channel, a mounting hole and a pressure regulating hole, a valve port being formed at one end of the air outlet channel, the valve port being connected to the air inlet channel, the mounting hole and the pressure regulating hole both being connected to the air outlet channel and the external space of the main body; a valve plate, connected to the main body; a push rod, which is penetrated through the mounting hole from the outside of the main body, and extends from the valve port to abut against the valve plate, the push rod being provided with a center hole which passes through the push rod along its own axial direction; the push rod is used to slide in the mounting hole according to the change of the air pressure of the external space at the pressure regulating hole, and when the air pressure of the external space at the pressure regulating hole is greater than or equal to a preset value, the push rod is separated from the valve plate, and the air outlet channel is connected to the center hole.

[0006] In one embodiment, the push rod includes a rod portion and a ring plate connected to each other, the ring plate is arranged on the outer peripheral surface of the rod portion and is used to abut the body at the mounting hole, the rod portion is provided with the center hole, and the outer peripheral surface of the rod portion is tightly arranged against the inner wall of the mounting hole.

[0007] In one embodiment, the pressure limiting valve also includes a diaphragm, which is sleeved on the rod and fixedly connected to the ring, the diaphragm and the body are enclosed to form a pressure regulating chamber, the pressure regulating hole is connected to the pressure regulating chamber, and the diaphragm is a deformable structure so that the volume of the pressure regulating chamber can be changed.

[0008] In one embodiment, the diaphragm includes a first surface and a second surface facing each other, the first surface is connected to the ring plate, the edge of the first surface is opposite to the outlet of the pressure regulating hole, and the second surface is located on the side of the first surface facing away from the ring plate, and the diaphragm is used to drive the ring plate to move along the axial direction of the rod.

[0009] In one embodiment, the pressure limiting valve also includes a gasket, which is sleeved on the rod portion, and the gasket includes a first surface and a second surface opposite to each other, the first surface abuts against the second surface, and the second surface faces the side of the first surface opposite to the valve plate, and the gasket is used to drive the diaphragm to move along the axial direction of the rod portion.

[0010] In one embodiment, the pressure-limiting valve further includes a connecting piece, wherein the connecting piece and the body enclose a receiving cavity, and the receiving cavity is used to accommodate the gasket and at least a portion of the rod.

[0011] In one embodiment, the pressure-limiting valve further includes a first spring, one end of the first spring abuts against the gasket, and the other end of the first spring is connected to the connecting member, and the first spring is used to drive the gasket to move along the axis of the first spring.

[0012] In one embodiment, the pressure-limiting valve further includes a second spring, one end of the second spring abuts against the valve plate, and the other end of the second spring is connected to the body, and the second spring is used to drive the valve plate to approach or move away from the valve port.

[0013] In one embodiment, the air outlet channel includes a first section and a second section that are connected, the end of the first section away from the second section forms the valve port, the first section and the second section have an angle, the mounting hole extends on the same straight line as the first section, and the pressure regulating hole is connected to the second section.

[0014] In one embodiment, the cross-sectional shapes of the first section and the mounting hole are both circular, and the axis of the first section coincides with the axis of the mounting hole.

[0015] In one implementation manner, the diameter of the first section is A1, and the diameter of the mounting hole is A2, satisfying: A1>A2.

[0016] In one implementation manner, an included angle between the first section and the second section is B, satisfying: 60°≤B≤120°.

[0017] In a second aspect, the utility model further provides a mechanical device, comprising the pressure limiting valve as described in the first aspect.

[0018] In a third aspect, the utility model further provides a safety airbag, comprising the mechanical device as described in the second aspect.

[0019] In a fourth aspect, the utility model further provides a vehicle, comprising the safety airbag as described in the third aspect.

[0020] By setting a body, a valve plate and a push rod, the body is provided with an air inlet channel, an air outlet channel, a mounting hole and a pressure regulating hole, a valve port is formed at one end of the air outlet channel, the valve port is connected to the air inlet channel, and the mounting hole and the pressure regulating hole are both connected to the air outlet channel and the external space of the body; the valve plate is connected to the body; the push rod is arranged in the mounting hole from the outside of the body, and extends from the valve port to abut against the valve plate, and the push rod is provided with a center hole that penetrates along its own axial direction; the push rod is used to slide in the mounting hole according to the air pressure change of the external space at the pressure regulating hole, and the push rod is separated from the valve plate when the air pressure of the external space at the pressure regulating hole is greater than or equal to the preset value. When the valve plate fails to seal the valve port, and the air pressure of the external space at the pressure regulating hole is greater than or equal to the preset value, the gas in the air outlet channel drives the push rod to slide in the mounting hole through the pressure regulating hole, so that the push rod is separated from the valve plate and a gap is formed, and the gas enters the center hole from the gap and is released, which solves the problem of damaging the rear-end equipment when the valve port seal of the pressure limiting valve fails. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 is a cross-sectional view of a pressure limiting valve according to an embodiment;

[0023] Figure 2 is an exploded structural diagram of a pressure limiting valve according to an embodiment;

[0024] Figure 3 The structure diagram of a push rod of an embodiment.

[0025] Description of reference numerals:

[0026] 10-pressure limiting valve, 11-body, 111-inlet channel, 112-outlet channel, 1121-first section, 1122-second section, 113-mounting hole, 114-pressure regulating hole, 115-valve port, 12-valve plate, 13-push rod, 131-rod, 132-ring plate, 133-center hole, 14-diaphragm, 141-first surface, 142-second surface, 15-pressure regulating chamber, 16-gasket, 161-first surface, 162-second surface, 17-connecting piece, 18-receiving chamber, 19-first spring, 20-second spring, 21-screw upper cover, 22-adjusting screw, 23-spring lower gasket, 24-sealing ring, 25-lower cover, 26-hole retaining ring, 27-spring upper gasket. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] The terms "first", "second", etc. in the specification and claims of the present utility model and the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices.

[0029] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0030] The utility model embodiment provides a pressure limiting valve 10, please refer to Figure 1 and Figure 2 , including a body 11, an air inlet channel 111, an air outlet channel 112, a mounting hole 113, a pressure regulating hole 114, a valve port 115, a valve plate 12, a push rod 13 and a center hole 133.

[0031] The main body 11 is provided with an air inlet channel 111, an air outlet channel 112, a mounting hole 113 and a pressure regulating hole 114. A valve port 115 is formed at one end of the air outlet channel 112. The valve port 115 is connected to the air inlet channel 111. The mounting hole 113 and the pressure regulating hole 114 are connected to the air outlet channel 112 and the external space of the main body 11.

[0032] Optionally, the cross-sectional shape of the air inlet channel 111 may be a polygon, a circle, an ellipse, an irregular shape, etc. Optionally, the cross-sectional shape of the air inlet channel 111 may be, but not limited to, a quadrilateral, a pentagon, a hexagon, an octagon, a circle, an ellipse, etc. Optionally, the cross-sectional shape of the air outlet channel 112 may be, but not limited to, a quadrilateral, a pentagon, a hexagon, an octagon, a circle, an ellipse, etc. Optionally, the cross-sectional shape of the air outlet channel 112 may be, but not limited to, a quadrilateral, a pentagon, a hexagon, an octagon, a circle, an ellipse, etc.

[0033] The valve plate 12 is connected to the body 11. Optionally, the shape of the valve plate 12 can be polygonal, circular, elliptical, irregular, etc. Optionally, the shape of the valve plate 12 can be, but is not limited to, quadrilateral, pentagon, hexagon, octagon, circular, elliptical, etc.

[0034] The push rod 13 is inserted into the mounting hole 113 from the outside of the body 11, and extends from the valve port 115 to abut against the valve plate 12. The push rod 13 is provided with a central hole 133 that penetrates along its own axial direction. The push rod 13 is used to slide in the mounting hole 113 according to the air pressure change of the external space at the pressure regulating hole 114, and when the air pressure of the external space at the pressure regulating hole 114 is greater than or equal to a preset value, the push rod 13 is separated from the valve plate 12, and the air outlet channel 112 is connected to the central hole 133. Specifically, the central hole 133 is connected to the mounting hole 113.

[0035] By setting the main body 11, the valve plate 12 and the push rod 13, the main body 11 is provided with an air inlet channel 111, an air outlet channel 112, a mounting hole 113 and a pressure regulating hole 114, a valve port 115 is formed at one end of the air outlet channel 112, the valve port 115 is communicated with the air inlet channel 111, the mounting hole 113 and the pressure regulating hole 114 are both connected with the air outlet channel 112 and the external space of the main body 11; the valve plate 12 is connected with the main body 11; the push rod 13 is penetrated from the outside of the main body 11 in the mounting hole 113, and extends from the valve port 115 to abut against the valve plate 12, and the push rod 13 is provided with a center hole 133 which passes through along its own axial direction; the push rod 13 is used to slide in the mounting hole 113 according to the air pressure change of the external space at the pressure regulating hole 114, and when the air pressure of the external space at the pressure regulating hole 114 is greater than or equal to the preset value, the push rod 13 is separated from the valve plate 12. When the seal of the valve plate 12 on the valve port 115 fails, and the air pressure in the external space at the pressure regulating hole 114 is greater than or equal to a preset value, the gas in the air outlet channel 112 drives the push rod 13 to slide in the mounting hole 113 via the pressure regulating hole 114, so that the push rod 13 is separated from the valve plate 12 and a gap is formed. The gas enters the center hole 133 from the gap and is released, thereby solving the problem of damaging the rear-end equipment when the seal of the valve port 115 of the pressure limiting valve 10 fails.

[0036] In one embodiment, please refer to Figure 1 and Figure 2 The push rod 13 includes a rod portion 131 and a ring piece 132 connected to each other. The ring piece 132 is arranged on the outer peripheral surface of the rod portion 131 and is used to abut against the body 11 at the mounting hole 113. The rod portion 131 is provided with a center hole 133, and the outer peripheral surface of the rod portion 131 is tightly arranged against the inner wall of the mounting hole 113.

[0037] Specifically, the outer peripheral surface of the rod portion 131 is tightly attached to the inner wall of the mounting hole 113 , so that gas will not leak from the mounting hole 113 .

[0038] In one embodiment, please refer to Figure 1 and Figure 2 The pressure limiting valve 10 also includes a membrane 14, which is sleeved on the rod 131 and fixedly connected to the ring 132. The diaphragm 14 and the body 11 enclose a pressure regulating chamber 15, and the pressure regulating hole 114 is connected to the pressure regulating chamber 15. The diaphragm 14 is a deformable structure so that the volume of the pressure regulating chamber 15 can be changed.

[0039] Optionally, the shape of the diaphragm 14 may be polygonal, circular, elliptical, etc. Optionally, the shape of the diaphragm 14 may specifically be, but not limited to, quadrilateral, hexagon, octagon, circular, elliptical, etc.

[0040] Specifically, the diaphragm 14 realizes the function of making the volume of the pressure regulating chamber 15 variable.

[0041] In one embodiment, please refer to Figure 1 , Figure 2 and Figure 3 The diaphragm 14 includes a first surface 141 and a second surface 142 facing each other. The first surface 141 is connected to the ring piece 132. The edge of the first surface 141 is opposite to the outlet of the pressure regulating hole 114. The second surface 142 is located on the side of the first surface 141 facing away from the ring piece 132. The diaphragm 14 is used to drive the ring piece 132 to move along the axial direction of the rod portion 131.

[0042] Optionally, the first surface 141 and the second surface 142 are polished by fluid polishing, mechanical polishing, ultrasonic polishing, chemical polishing, electrolytic polishing, etc. Polishing the first surface 141 and the second surface 142 improves the smoothness of the first surface 141 and the second surface 142 and avoids scratching the parts.

[0043] Specifically, the above arrangement of the first surface 141 and the second surface 142 improves the transmission function of the diaphragm 14 .

[0044] In one embodiment, please refer to Figure 1 , Figure 2 and Figure 3 The pressure limiting valve 10 also includes a gasket 16, which is sleeved on the rod portion 131. The gasket 16 includes a first surface 161 and a second surface 162 that are opposite to each other. The first surface 161 abuts against the second surface 142, and the second surface 162 faces the side of the first surface 161 that is away from the valve plate 12. The gasket 16 is used to drive the diaphragm 14 to move along the axial direction of the rod portion 131.

[0045] Optionally, the shape of the gasket 16 may be polygonal, circular, elliptical, etc. Optionally, the shape of the gasket 16 may specifically be, but not limited to, quadrilateral, hexagon, octagon, circular, elliptical, etc.

[0046] Optionally, the first surface 161 and the second surface 162 are polished, and the polishing method may be fluid polishing, mechanical polishing, ultrasonic polishing, chemical polishing, electrolytic polishing, etc. Polishing the first surface 161 and the second surface 162 improves the smoothness of the first surface 161 and the second surface 162 and avoids scratching the parts.

[0047] Specifically, the above arrangement of the gasket 16 improves the transmission process of the pressure limiting valve 10 .

[0048] In one embodiment, please refer to Figure 1 , Figure 2 and Figure 3 , the axis of the washer 16 coincides with the axis of the rod 131 .

[0049] Specifically, when the washer 16 and the rod 131 move together, the axis of the washer 16 coincides with the axis of the rod 131 , so that the washer 16 will not be skewed relative to the rod 131 .

[0050] Specifically, the above arrangement of the axis of the washer 16 and the axis of the rod 131 improves the transmission accuracy.

[0051] In one embodiment, please refer to Figure 1 , Figure 2 and Figure 3 The pressure limiting valve 10 further includes a connecting member 17 . The connecting member 17 and the body 11 enclose a receiving cavity 18 . The receiving cavity 18 is used to accommodate the gasket 16 and at least a portion of the rod 131 .

[0052] Optionally, the receiving chamber 18 also receives the first spring 19 , the ring sheet 132 , the diaphragm 14 and the like.

[0053] Optionally, the pressure-limiting valve 10 further includes a screw upper cover 21 , an adjusting screw 22 , a spring lower washer 23 , a sealing ring 24 , a lower cover 25 , a hole retaining ring 26 and a spring upper washer 27 .

[0054] Specifically, the above arrangement of the connecting member 17 improves the transmission process of the pressure-limiting valve 10 .

[0055] In one embodiment, please refer to Figure 1 , Figure 2 and Figure 3 The pressure limiting valve 10 further includes a first spring 19 , one end of the first spring 19 abuts against the gasket 16 , and the other end is connected to the connecting member 17 . The first spring 19 is used to drive the gasket 16 to move along the axis of the first spring 19 .

[0056] Optionally, the shape of the first spring 19 is cylindrical, conical, convex, concave, non-circular, etc.

[0057] Optionally, the first spring 19 is made of carbon steel, alloy steel, silicon manganese steel or chrome vanadium steel.

[0058] Specifically, the first spring 19 improves the transmission process of the pressure limiting valve 10 and improves the regulating function of the pressure limiting valve 10 .

[0059] In one embodiment, please refer to Figure 1 and Figure 2 The air outlet channel 112 includes a first section 1121 and a second section 1122 that are connected to each other. The end of the first section 1121 away from the second section 1122 forms a valve port 115. The first section 1121 and the second section 1122 have an included angle. The mounting hole 113 extends on the same straight line as the first section 1121. The pressure regulating hole 114 is connected to the second section 1122.

[0060] Optionally, the mounting hole 113 may be a polygonal hole, a circular hole, an elliptical hole, an irregular hole, etc. Optionally, the mounting hole 113 may be, but is not limited to, a quadrilateral hole, a pentagonal hole, a hexagonal hole, an octagonal hole, a circular hole, an elliptical hole, etc.

[0061] Optionally, the pressure regulating hole 114 may be a polygonal hole, a circular hole, an elliptical hole, an irregular hole, etc. Optionally, the pressure regulating hole 114 may be, but is not limited to, a quadrilateral hole, a pentagonal hole, a hexagonal hole, an octagonal hole, a circular hole, an elliptical hole, etc.

[0062] Specifically, the above arrangement of the first section 1121 and the second section 1122 improves the pressure relief structure of the pressure limiting valve 10 .

[0063] In one embodiment, please refer to Figure 1 and Figure 2 The cross-sectional shapes of the first section 1121 and the mounting hole 113 are both circular, and the axis of the first section 1121 coincides with the axis of the mounting hole 113 .

[0064] Specifically, the axis of the first section 1121 coincides with the axis of the mounting hole 113 , so that the push rod 13 can slide smoothly and continuously in the first section 1121 and the mounting hole 113 .

[0065] In one embodiment, please refer to Figure 1 and Figure 2 , the diameter of the first section 1121 is A1, and the diameter of the mounting hole 113 is A2, satisfying: A1>A2.

[0066] Optionally, the diameter of the mounting hole 113 is A2, and the outer diameter of the push rod 13 is A2. Since A1>A2, gas will not leak from the mounting hole 113.

[0067] In one embodiment, please refer to Figure 1 and Figure 2 , the included angle between the first section 1121 and the second section 1122 is B, which satisfies: 60°≤B≤120°.

[0068] Optionally, the angle between the first section 1121 and the second section 1122 may be, but is not limited to, 60°, 70°, 80°, 90°, 120°, etc.

[0069] Specifically, the above setting of the angle between the first section 1121 and the second section 1122 increases the flexibility of the pressure relief structure of the pressure limiting valve 10 .

[0070] In one embodiment, please refer to Figure 1 , Figure 2 and Figure 3The pressure limiting valve 10 further includes a second spring 20 , one end of the second spring 20 abuts against the valve plate 12 , and the other end is connected to the body 11 . The second spring 20 is used to drive the valve plate 12 to approach or move away from the valve port 115 .

[0071] Optionally, the second spring 20 has a cylindrical, conical, convex, concave, or non-circular shape.

[0072] Optionally, the second spring 20 is made of carbon steel, alloy steel, silicon manganese steel or chrome vanadium steel.

[0073] Optionally, the second spring 20 and the body 11 may be movably abutted or fixedly connected. Optionally, the connection method between the second spring 20 and the body 11 may specifically be, but not limited to, snap connection, riveted connection, and welded connection. Optionally, the connection method between the second spring 20 and the body 11 is welding connection, and the specific welding method between the second spring 20 and the body 11 is brazing, using a metal material with a lower melting point than the second spring 20 and the body 11 as a brazing material, heating the second spring 20, the body 11, and the brazing material to a temperature higher than the melting point of the brazing material and lower than the melting point of the second spring 20 and the body 11, and using liquid brazing material to wet the second spring 20 and the body 11, filling the interface gap and achieving mutual diffusion between atoms with the second spring 20 and the body 11, thereby achieving welding, and the welding connection method is simple to operate and has a stable connection. The present utility model uses brazing as an example of the connection method, which should not be understood as a limitation of the present utility model.

[0074] The embodiment of the utility model further provides a mechanical device, comprising the pressure limiting valve 10 as mentioned above.

[0075] Optionally, the mechanical device may be a fuel vehicle, an electric vehicle or a hybrid vehicle.

[0076] The embodiment of the utility model further provides a safety airbag, comprising the mechanical device as described above.

[0077] An embodiment of the utility model further provides a vehicle, comprising the safety airbag as described above.

[0078] In the description of the present invention, it should be noted that the orientation or positional relationship of terms such as "center", "up", "down", "left", "right", "vertical", "horizontal", "inside" and "outside" are based on the orientation or positional relationship of the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0079] What is disclosed above is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Ordinary technicians in this field can understand that all or part of the processes of the above embodiment and equivalent changes made according to the claims of the present invention still fall within the scope covered by the present invention.

Claims

1. A pressure limiting valve (10), characterized in that: include: A body (11) is provided with an air inlet channel (111), an air outlet channel (112), a mounting hole (113) and a pressure regulating hole (114); a valve port (115) is formed at one end of the air outlet channel (112); the valve port (115) is communicated with the air inlet channel (111); the mounting hole (113) and the pressure regulating hole (114) are both communicated with the air outlet channel (112) and the external space of the body (11); A valve plate (12) connected to the body (11); A push rod (13) is provided from the outside of the body (11) through the mounting hole (113), and extends from the valve port (115) to abut against the valve plate (12). The push rod (13) is provided with a central hole (133) extending through the push rod along its axial direction. The push rod (13) is used to slide in the mounting hole (113) according to the change of the air pressure of the external space at the pressure regulating hole (114), and when the air pressure of the external space at the pressure regulating hole (114) is greater than or equal to a preset value, the push rod (13) is separated from the valve plate (12), and the air outlet channel (112) is connected to the center hole (133).

2. The pressure limiting valve (10) according to claim 1, characterized in that: The push rod (13) includes a rod portion (131) and a ring plate (132) connected to each other. The ring plate (132) is arranged on the outer peripheral surface of the rod portion (131) and is used to abut against the body (11) at the mounting hole (113). The rod portion (131) is provided with the center hole (133), and the outer peripheral surface of the rod portion (131) is tightly arranged against the inner wall of the mounting hole (113).

3. The pressure limiting valve (10) according to claim 2, characterized in that: The pressure limiting valve (10) further comprises a diaphragm (14), the diaphragm (14) being sleeved on the rod portion (131) and being connected and fixed to the ring plate (132), the diaphragm (14) and the body (11) enclosing a pressure regulating chamber (15), the pressure regulating hole (114) being connected to the pressure regulating chamber (15), and the diaphragm (14) being a deformable structure so that the volume of the pressure regulating chamber (15) is variable.

4. The pressure limiting valve (10) according to claim 3, characterized in that: The diaphragm (14) comprises a first surface (141) and a second surface (142) which are opposite to each other, the first surface (141) being connected to the annular plate (132), the edge of the first surface (141) being opposite to the outlet of the pressure regulating hole (114), and the second surface (142) being located on the side of the first surface (141) facing away from the annular plate (132), and the diaphragm (14) being used to drive the annular plate (132) to move along the axial direction of the rod portion (131).

5. The pressure limiting valve (10) according to claim 4, characterized in that: The pressure-limiting valve (10) further comprises a gasket (16), wherein the gasket (16) is sleeved on the rod portion (131), and the gasket (16) comprises a first surface (161) and a second surface (162) opposite to each other, wherein the first surface (161) abuts against the second surface (142), and the second surface (162) faces the side of the first surface (161) opposite to the valve plate (12), and the gasket (16) is used to drive the diaphragm (14) to move along the axial direction of the rod portion (131).

6. The pressure limiting valve (10) according to claim 5, characterized in that The pressure-limiting valve (10) further comprises a connecting piece (17), wherein the connecting piece (17) and the body (11) enclose a receiving cavity (18), and the receiving cavity (18) is used to accommodate the gasket (16) and at least a portion of the rod portion (131).

7. The pressure limiting valve (10) according to claim 6, characterized in that The pressure limiting valve (10) further comprises a first spring (19), one end of the first spring (19) being in contact with the gasket (16), and the other end being connected to the connecting member (17), and the first spring (19) being used for driving the gasket (16) to move along the axis of the first spring (19).

8. The pressure limiting valve (10) according to claim 1, characterized in that: The air outlet channel (112) comprises a first section (1121) and a second section (1122) which are connected to each other; the end of the first section (1121) away from the second section (1122) forms the valve port (115); the first section (1121) and the second section (1122) have an included angle; the mounting hole (113) and the first section (1121) extend on the same straight line; and the pressure regulating hole (114) is connected to the second section (1122).

9. The pressure limiting valve (10) according to claim 8, characterized in that The cross-sectional shapes of the first section (1121) and the mounting hole (113) are both circular, and the axis of the first section (1121) coincides with the axis of the mounting hole (113).

10. The pressure limiting valve (10) according to claim 9, characterized in that The diameter of the first section (1121) is A1, and the diameter of the mounting hole (113) is A2, satisfying: A1>A2.

11. The pressure limiting valve (10) according to claim 8, characterized in that The included angle between the first section (1121) and the second section (1122) is B, which satisfies: 60°≤B≤120°.

12. The pressure limiting valve (10) according to claim 1, characterized in that The pressure-limiting valve (10) further comprises a second spring (20), one end of the second spring (20) being in contact with the valve plate (12), and the other end being connected to the body (11), and the second spring (20) being used for driving the valve plate (12) to move closer to or away from the valve port (115).

13. A mechanical device, characterized in that: The invention comprises a pressure limiting valve (10) as claimed in any one of claims 1 to 12.

14. A safety airbag, characterized in that: Comprising the mechanical device as claimed in claim 13.

15. A vehicle, characterized in that: Comprising the airbag as claimed in claim 14.

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