Pressure limiting valve, seat adjusting system and vehicle

Abstract

The utility model relates to a pressure limiting valve which comprises a valve body provided with a pressure stabilizing cavity and a pressure relief cavity, and a pressure relief valve port is formed in the connecting position of the pressure relief cavity and the pressure stabilizing cavity; the pressure relief valve element can be axially arranged in the pressure relief cavity in a reciprocating mode, the end, close to the pressure relief valve port, of the pressure relief valve element is provided with an abutting-against part, and the abutting-against part and the pressure relief valve port are oppositely arranged; the second elastic part is arranged in the pressure relief cavity, the first end of the second elastic part abuts against the end, away from the pressure relief valve port, of the pressure relief valve element, the pressure limiting valve has an overpressure state and a pressure stabilizing state, in the overpressure state, gas in the pressure stabilizing cavity flows to the pressure relief valve port and pushes the pressure relief valve element to move, so that a gap is formed between the abutting part and the pressure relief valve port, and the first end of the second elastic part abuts against the end, away from the pressure relief valve port, of the pressure relief valve element. The pressure release valve port is conducted; and in the pressure stabilizing state, the pressure relief valve element moves under the action of the elastic force of the second elastic piece, so that the abutting part abuts against the pressure relief valve port, and the pressure relief valve port is closed. In this way, rear-end equipment can be protected from being damaged by high-pressure gas, and therefore the safety performance of automobile parts and equipment is improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of gas decompression, and in particular to a pressure limiting valve, a seat adjustment system and a vehicle. Background Art

[0002] In the related art, the pressure limiting valve inputs high-pressure gas from the input end and outputs low-pressure gas from the output end, so as to keep the pressure at the rear end of the valve port relatively stable. However, for some reason, when the valve port cannot be closed or is not closed tightly, the gas pressure in the outlet channel will continue to rise, and the pressure at the rear end of the valve port will be higher than the design pressure. If the pressure at the rear end of the valve port exceeds the capacity of the rear-end equipment or device, it may cause irreversible damage to the rear-end equipment or device. Utility Model Content

[0003] An object of the present disclosure is to provide a pressure limiting valve, a seat adjustment system and a vehicle to at least partially solve the problems existing in the related art.

[0004] In order to achieve the above object, the present disclosure provides a pressure limiting valve, comprising:

[0005] The valve body has a pressure stabilizing chamber and a pressure relief chamber, wherein the connection between the pressure relief chamber and the pressure stabilizing chamber forms a pressure relief valve port;

[0006] A pressure relief valve core can be axially reciprocated in the pressure relief chamber, and an end of the pressure relief valve core close to the pressure relief valve port is provided with a stopper, and the stopper is arranged opposite to the pressure relief valve port; and

[0007] A second elastic member is disposed in the pressure relief chamber, wherein a first end of the second elastic member abuts against an end of the pressure relief valve core away from the pressure relief valve port.

[0008] The pressure limiting valve has an overpressure state and a steady pressure state, wherein:

[0009] In the overpressure state, the gas in the pressure stabilizing chamber flows to the pressure relief valve port and pushes the pressure relief valve core to move, so that a gap is formed between the stopper and the pressure relief valve port, and the pressure relief valve port is connected;

[0010] In the pressure-stabilizing state, the pressure relief valve core moves under the elastic force of the second elastic member, so that the stopping portion stops at the pressure relief valve port, and the pressure relief valve port is cut off.

[0011] Optionally, the pressure relief valve core comprises:

[0012] A main body having an end surface for the second elastic member to stop, and a gap is formed between a side wall of the main body and a side wall of the pressure relief chamber;

[0013] The stopper is arranged at an end of the main body close to the pressure relief valve port; and

[0014] The limiting portion is axially protrudingly arranged at the end of the main body away from the pressure relief valve port, and the first end of the second elastic member is sleeved on the outer wall of the limiting portion to abut against the end surface of the main body.

[0015] Optionally, the pressure relief chamber has an air relief port connected to the outside, and a mounting portion is further provided in the pressure relief chamber. The mounting portion is closer to the air relief port than the pressure relief valve core, and a through hole is axially opened in the mounting portion, one end of the through hole is used to communicate with the pressure relief valve port, and the other end is used to communicate with the air relief port, and a radially protruding stop section is provided on the side of the inner wall of the mounting portion close to the air relief port, and the second end of the second elastic member extends into the through hole and abuts against the stop section.

[0016] Optionally, the outer diameter of the pressure relief valve core is larger than the aperture of the through hole, and when the pressure relief valve port is open, the pressure relief valve core presses against the end of the mounting portion close to the pressure relief valve core, and the end of the mounting portion close to the pressure relief valve core is formed with a groove communicating with the through hole, and the groove is configured to connect the through hole and the pressure relief valve port when the pressure relief valve port is open.

[0017] Optionally, a retaining ring is further provided in the pressure relief chamber, and the retaining ring is stopped between the mounting portion and the air relief port.

[0018] Optionally, the stopping portion is made of rubber.

[0019] Optionally, a sealing ring is installed at the pressure relief valve port, and the stop portion is configured to abut against the sealing ring when the pressure relief valve port is closed.

[0020] Optionally, the valve body also has a high-pressure chamber, the high-pressure chamber has an air inlet, the pressure-stabilizing chamber has an air outlet, and the pressure relief chamber has an air release port, the air inlet and the air outlet are respectively facing the front and rear sides of the valve body, and the air release port is facing the left or right side of the valve body.

[0021] Optionally, the valve body further has a high-pressure chamber, and the connection between the high-pressure chamber and the pressure-stabilizing chamber forms a pressure-limiting valve port, and the pressure-limiting valve further includes:

[0022] A pressure-limiting valve core is movably disposed in the high-pressure chamber and is arranged opposite to the pressure-limiting valve port so as to be able to open or close the pressure-limiting valve port;

[0023] a first elastic member, one end of which abuts against an end of the pressure-limiting valve core away from the pressure-limiting valve port to provide an elastic force for driving the pressure-limiting valve core to move so that the pressure-limiting valve core closes the pressure-limiting valve port; and

[0024] The push rod assembly is used to drive the pressure-limiting valve core to move so as to open the pressure-limiting valve port.

[0025] Optionally, the pressure-limiting valve further comprises a cover body, wherein the cover body and the valve body are aligned with each other along the moving direction of the pressure-limiting valve core.

[0026] The push rod assembly includes a diaphragm disposed between the cover body and the valve body and a valve stem vertically connected to the diaphragm, wherein the bottom end of the valve stem abuts against the top end of the pressure-limiting valve core.

[0027] A drainage cavity is defined between the diaphragm and the valve body, a cover cavity is defined between the diaphragm and the cover body, and the drainage cavity is communicated with the pressure stabilizing cavity.

[0028] The push rod assembly also includes a third elastic member disposed in the cover body cavity, and a first end of the third elastic member abuts against the diaphragm to provide an elastic force for driving the diaphragm to move so that the pressure-limiting valve core is connected to the pressure-limiting valve port.

[0029] Optionally, an adjusting screw is threadedly connected to the top end of the cover body, and the adjusting screw extends into the cover body cavity to press against the second end of the third elastic member.

[0030] Optionally, the bottom end of the adjusting screw is connected to a first washer, the top end of the diaphragm is connected to a second washer, the first end of the third elastic member abuts against the second washer, and the second end of the third elastic member abuts against the first washer.

[0031] Optionally, a gasket is provided between the diaphragm and the cover body.

[0032] According to a second aspect of the present disclosure, a seat adjustment system is also provided, comprising the above-mentioned pressure limiting valve.

[0033] According to a third aspect of the present disclosure, a vehicle is also provided, comprising the above-mentioned seat adjustment system.

[0034] Through the above technical scheme, under normal working conditions, the pressure relief valve core is subjected to the elastic pressure of the first elastic member, and the stop portion of the pressure relief valve core fits and seals with the valve body at the pressure relief valve port; when the pressure limiting valve port cannot be closed or is not closed tightly, the air pressure in the pressure stabilizing chamber will continue to increase, and when the air pressure at the rear end of the valve port exceeds the designed air pressure, the gas in the pressure stabilizing chamber will enter the pressure relief chamber and overcome the elastic force of the first elastic member to push the pressure relief valve core to form a gap with the pressure relief valve port, so that the pressure relief valve port is connected, and the overpressure gas escapes from the pressure relief valve port, so that the pressure in the pressure stabilizing chamber is reduced to within the designed pressure range, thereby protecting the rear-end equipment from being damaged by the high-pressure gas, and improving the safety performance of automobile components and equipment.

[0035] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0037] Figure 1 is a structural schematic diagram of a pressure limiting valve provided by an exemplary embodiment of the present disclosure;

[0038] Figure 2 is an exploded view of a pressure limiting valve provided by an exemplary embodiment of the present disclosure;

[0039] Figure 3 is a cross-sectional view of the pressure-limiting valve in the height direction when the pressure-limiting valve port is in a conducting state provided by an exemplary embodiment of the present disclosure;

[0040] Figure 4 is a cross-sectional view of a pressure-limiting valve in a height direction when a pressure-limiting valve port is in a cut-off state provided by an exemplary embodiment of the present disclosure;

[0041] Figure 5 is a cross-sectional view in the horizontal direction of the pressure limiting valve when the pressure relief valve port is in a conducting state provided by an exemplary embodiment of the present disclosure;

[0042] Figure 6 is a cross-sectional view in the horizontal direction of a pressure limiting valve when a pressure relief valve port is in a cut-off state provided by an exemplary embodiment of the present disclosure;

[0043] Figure 7 It is an exploded view of the assembly of a pressure relief valve core, a first elastic member, a mounting portion, and a retaining ring in a pressure limiting valve provided in an exemplary embodiment of the present disclosure;

[0044] Figure 8 It is a schematic diagram of the assembly of a diaphragm and a valve stem in a pressure-limiting valve provided in an exemplary embodiment of the present disclosure.

[0045] Description of Reference Numerals

[0046] 10 Pressure limiting valve port 20 Pressure relief valve port

[0047] 21 Pressure relief valve core 211 Main body

[0048] 212 stopper 213 limiter

[0049] 22 first elastic member 23 mounting portion

[0050] 231 through hole 232 stop section

[0051] 233 groove 24 retaining ring

[0052] 25 Sealing ring 100 Valve body

[0053] 110 High pressure chamber 111 Air inlet

[0054] 120 pressure stabilizing chamber 121 air outlet

[0055] 130 pressure relief chamber 131 air relief port

[0056] 200 pressure limiting valve core 300 second elastic member

[0057] 400 Cover 500 Diaphragm

[0058] 600 Valve stem 700 Drainage chamber

[0059] 800 Cover body cavity 810 Third elastic member

[0060] 820 First washer 830 Second washer

[0061] 900 Adjusting screw 910 Screw cover

[0062] 1000 Gasket DETAILED DESCRIPTION

[0063] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0064] In the present disclosure, unless otherwise stated, the directional terms "upper", "lower", "top", "bottom", "front", "back", "left", and "right" are defined based on the directions in which the relevant components are actually used. Figure 3 , Figure 5 The direction indicated by the arrow in the figure is for the convenience of description in conjunction with the drawings, and does not actually limit the direction. "Inside" and "outside" refer to the outline of the corresponding parts. In addition, the terms "first" and "second" used in this disclosure are to distinguish one element from another, and do not have order and importance. In this disclosure, when the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0065] Reference Figures 1 to 8The present disclosure provides a pressure limiting valve, which may include a valve body 100, a pressure relief valve core 21 and a first elastic member 22, wherein the valve body 100 has a pressure stabilizing chamber 120 and a pressure relief chamber 130, and the connection between the pressure relief chamber 130 and the pressure stabilizing chamber 120 forms a pressure relief valve port 20; the pressure relief valve core 21 may be axially reciprocated in the pressure relief chamber 130, and a stopper 212 is provided at the end of the pressure relief valve core 21 close to the pressure relief valve port 20, and the stopper 212 is arranged opposite to the pressure relief valve port 20; the first elastic member 22 is arranged in the pressure relief chamber 130 , the first end of the first elastic member 22 abuts against the end of the pressure relief valve core 21 away from the pressure relief valve port 20, and the pressure limiting valve has an overpressure state and a steady pressure state, wherein in the overpressure state, the gas in the pressure stabilizing chamber 120 flows to the pressure relief valve port 20 and pushes the pressure relief valve core 21 to move, so that a gap is formed between the abutment portion 212 and the pressure relief valve port 20, and the pressure relief valve port 20 is open; in the steady pressure state, the pressure relief valve core 21 moves under the elastic force of the first elastic member 22, so that the abutment portion 212 abuts against the pressure relief valve port 20, and the pressure relief valve port 20 is closed. In the embodiment of the present disclosure, the first elastic member 22 is a spring.

[0066] Through the above technical scheme, under normal working conditions, that is, the pressure limiting valve is in a pressure-stabilizing state, the pressure relief valve core is subjected to the elastic pressure of the first elastic member, and the stop portion of the pressure relief valve core fits and seals with the valve body at the pressure relief valve port; when the pressure limiting valve port cannot be closed or is not closed tightly, the air pressure in the pressure stabilizing chamber will continue to increase. When the air pressure at the rear end of the valve port exceeds the designed air pressure, the pressure limiting valve is in an overpressure state, and the gas in the pressure stabilizing chamber will enter the pressure relief chamber and overcome the elastic force of the first elastic member to push the pressure relief valve core to separate from the pressure relief valve port to form a gap, so that the pressure relief valve port is connected, and the overpressure gas escapes from the pressure relief valve port, so that the pressure in the pressure stabilizing chamber is reduced to within the designed pressure range, thereby protecting the rear-end equipment from being damaged by the high-pressure gas, and improving the safety performance of automobile components and equipment.

[0067] Among them, reference Figure 7 The pressure relief valve core 21 may include a main body 211, a stopper 212 and a limiting portion 213, wherein the main body 211 has an end face for the first elastic member 22 to stop, and a gap is provided between the side wall of the main body 211 and the side wall of the pressure relief chamber 130. When the pressure relief valve port 20 is connected, the overpressure gas can flow from the gap between the stopper 212 and the pressure relief valve port 20 to the gap between the main body 211 and the side wall of the pressure relief chamber 130, and then be discharged from the gas relief port 131; the stopper 212 is arranged at the end of the main body 211 close to the pressure relief valve port 20; the limiting portion 213 is axially protruding and arranged at the end of the main body 211 away from the pressure relief valve port 20, and the first end of the first elastic member 22 is sleeved on the outer wall of the limiting portion 213 to stop on the end face of the main body 211, and the limiting portion 213 can limit the displacement of the first elastic member 22 in the radial direction. It should be noted that the present disclosure does not limit the structure of the pressure relief valve core 21 .

[0068] As an exemplary embodiment of the present disclosure, refer to Figures 5 to 7 The pressure relief chamber 130 has a gas relief port 131 communicating with the outside world. A mounting portion 23 is also provided in the pressure relief chamber 130. The mounting portion 23 is closer to the gas relief port 131 than the pressure relief valve core 21. A through hole 231 is axially provided in the mounting portion 23. Here, the axial direction of the mounting portion 23 is the flow direction of the gas in the pressure relief chamber 130. One end of the through hole 231 is used to communicate with the pressure relief valve port 20, and the other end is used to communicate with the gas relief port 131. A radially protruding stop section 232 is provided on one side of the inner wall of the mounting portion 23 close to the gas relief port 131. The second end of the first elastic member 22 extends into the through hole 231 and abuts against the stop section 232. The stop section 232 of the mounting portion 23 provides a stop position for the end of the first elastic member 22 away from the pressure relief valve core 21, and the through hole 231 communicates with the pressure relief valve port 20 and the gas relief port 131, which will not affect the discharge of the overpressure gas.

[0069] Further, refer to Figures 5 to 7 , the outer diameter of the pressure relief valve core 21 is larger than the aperture of the through hole 231. When the pressure relief valve port 20 is open, the pressure relief valve core 21 abuts against the end of the mounting portion 23 close to the pressure relief valve core 21. The end of the mounting portion 23 close to the pressure relief valve core 21 is formed with a groove 233 communicating with the through hole 231. The groove 233 can be configured to connect the through hole 231 with the pressure relief valve port 20 when the pressure relief valve port 20 is open. Specifically, the mounting portion 23 can be configured in a cylindrical shape, and the end of the mounting portion 23 close to the pressure relief valve core 21 can be formed with a plurality of grooves 233 at intervals along the circumferential direction to connect the through hole 231 with the pressure relief valve port 20.

[0070] In some embodiments, reference Figures 5 to 7 A retaining ring 24 may be further provided in the pressure relief chamber 130, and the retaining ring 24 is stopped between the mounting portion 23 and the air relief port 131. The retaining ring 24 can stop the mounting portion 23 and restrict the mounting portion 23 from being disengaged from the air relief port 131. Specifically, the valve body 100 is provided with a slot for the retaining ring 24 to extend into, so as to fix the retaining ring 24 on the valve body 100.

[0071] Furthermore, the material of the stop portion 212 can be rubber, which has elasticity, and can make the stop portion 212 and the pressure relief valve port 20 stop more tightly, and the sealing effect is good.

[0072] According to some embodiments, reference Figure 5 , Figure 6A sealing ring 25 can be installed at the pressure relief valve port 20, and the stopper 212 can be configured to abut the sealing ring 25 when the pressure relief valve port 20 is closed. When the pressure relief valve port 20 is closed, the sealing ring 25 can fit with the stopper 212 to seal the pressure relief valve port 20, and the sealing effect is good. Similarly, a sealing ring can also be installed at the pressure limiting valve port 10, and the pressure limiting valve core 200 is configured to abut the sealing ring when the pressure limiting valve port 10 is closed.

[0073] In some embodiments, reference Figure 5 The valve body 100 also has a high-pressure chamber 110, the high-pressure chamber 110 has an air inlet 111, the pressure-stabilizing chamber 120 has an air outlet 121, and the pressure relief chamber 130 has an air release port 131. The air inlet 111 and the air outlet 121 can be respectively facing the front and rear sides of the valve body 100, and the air release port 131 can be facing the left or right side of the valve body 100. Such an arrangement can make the spatial layout of each structure of the pressure-limiting valve more reasonable. It should be noted that the present disclosure does not restrict the orientation of the air inlet 111, the air outlet 121 and the air release port 131. In addition, the above-mentioned directional words, such as "front side", "rear side", "left side" and "right side", are for the convenience of description in conjunction with the accompanying drawings, and do not actually limit the direction.

[0074] According to an exemplary embodiment of the present disclosure, the valve body 100 also has a high-pressure chamber 110, and the connection between the high-pressure chamber 110 and the pressure-stabilizing chamber 120 is formed as a pressure-limiting valve port 10. The pressure-limiting valve may also include a pressure-limiting valve core 200, a second elastic member 300 and a push rod assembly, wherein the pressure-limiting valve core 200 is movably arranged in the high-pressure chamber 110, and is arranged opposite to the pressure-limiting valve port 10 so as to be able to open or close the pressure-limiting valve port 10; one end of the second elastic member 300 abuts against the end of the pressure-limiting valve core 200 away from the pressure-limiting valve port 10 to provide an elastic force for driving the pressure-limiting valve core 200 to move, so that the pressure-limiting valve core 200 closes the pressure-limiting valve port 10; the push rod assembly is used to drive the pressure-limiting valve core 200 to move, so as to open the pressure-limiting valve port 10.

[0075] Further, refer to Figure 3 , Figure 4The pressure limiting valve may further include a cover body 400, the cover body 400 and the valve body 100 are mutually matched along the moving direction of the pressure limiting valve core 200, the push rod assembly may include a diaphragm 500 disposed between the cover body 400 and the valve body 100 and a valve stem 600 vertically connected to the diaphragm 500, the bottom end of the valve stem 600 abuts against the top end of the pressure limiting valve core 200, a drainage cavity 700 is defined between the diaphragm 500 and the valve body 100, a cover body cavity 800 is defined between the diaphragm 500 and the cover body 400, and the drainage cavity 700 is connected to the pressure stabilizing cavity 120, and the push rod assembly may further include a third elastic member 810 disposed in the cover body cavity 800, the first end of the third elastic member 810 abuts against the diaphragm 500 to provide an elastic force for driving the diaphragm 500 to move and make the pressure limiting valve core 200 conduct the pressure limiting valve port 10. In the embodiment of the present disclosure, the second elastic member 300 and the third elastic member 810 are both springs.

[0076] Specifically, the working process of the pressure limiting valve is as follows: high-pressure gas enters the high-pressure chamber 110 from the air inlet 111, reaches the pressure limiting valve port 10, and then passes through the pressure limiting valve port 10 to the pressure stabilizing chamber 120. When part of the gas enters the drainage chamber 700 from the pressure stabilizing chamber 120, the air pressure in the drainage chamber 700 acts on the bottom of the diaphragm 500. When the air pressure is greater than the elastic force of the third elastic member 810, the diaphragm 500 drives the valve stem 600 to move upward. At this time, the pressure limiting valve core 200 also moves upward under the elastic force of the second elastic member 300, and the pressure limiting valve The flow area of ​​the port 10 gradually decreases until it is closed, and the gas pressure in the pressure-stabilizing chamber 120 decreases, so that the diaphragm 500 reaches a balanced state; when the pressure in the pressure-stabilizing chamber 120 continues to decrease, the gas pressure in the drainage chamber 700 also decreases accordingly. When the elastic force of the third elastic member 810 is greater than the gas pressure, the diaphragm 500 drives the valve stem 600 to move downward, and pushes the pressure-limiting valve core 200 to move downward, the pressure-limiting valve port 10 is connected, the flow area increases, and the gas pressure in the pressure-stabilizing chamber 120 increases, so that the diaphragm 500 reaches a balanced state. Through the force balance of the diaphragm 500, the flow area of ​​the pressure-limiting valve port 10 is automatically adjusted, thereby achieving the decompression and stable output of high-pressure gas.

[0077] Specifically, refer to Figure 3 , Figure 4 The top of the cover body 400 may be threadedly connected with an adjusting screw 900, and the adjusting screw 900 extends into the cover body cavity 800 to press against the second end of the third elastic member 810. The spring force of the third elastic member 810 can be adjusted by adjusting the stroke of the adjusting screw 900, and the spring force of the third elastic member 810 can be adjusted according to the actual pressure reduction requirement so that the diaphragm 500 reaches a balanced state. The adjusting screw 900 is also covered with a screw cover 910, and the screw cover 910 and the cover body 400 are mutually matched in the moving direction of the pressure limiting valve core 200.

[0078] Further, refer to Figure 3 , Figure 4 , the bottom end of the adjusting screw 900 may be connected to a first washer 820, the top end of the diaphragm 500 may be connected to a second washer 830, the first end of the third elastic member 810 abuts against the second washer 830, and the second end of the third elastic member 810 abuts against the first washer 820. The washer has sufficient strength to better withstand the elastic force of the third elastic member 810, and the second washer 830 can protect the diaphragm 500, preventing the diaphragm 500 from directly contacting the third elastic member 810 to cause extrusion deformation and affect product performance.

[0079] In some embodiments, reference Figure 3 , Figure 4 A gasket 1000 may be provided between the diaphragm 500 and the cover 400. The gasket 1000 is an elastic structure, and the diaphragm 500 abuts against the gasket 1000 when moving, which can protect the diaphragm 500.

[0080] According to a second aspect of the present disclosure, a seat adjustment system is also provided, which may include the above-mentioned pressure limiting valve. The seat adjustment system has all the beneficial effects of the above-mentioned pressure limiting valve, which will not be described in detail here.

[0081] According to a third aspect of the present disclosure, a vehicle is also provided, the vehicle comprising the above-mentioned seat adjustment system. The vehicle has all the beneficial effects of the above-mentioned seat adjustment system, which will not be described in detail here.

[0082] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0083] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0084] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A pressure limiting valve, characterized in that: include: The valve body has a pressure stabilizing chamber and a pressure relief chamber, wherein the connection between the pressure relief chamber and the pressure stabilizing chamber forms a pressure relief valve port; A pressure relief valve core can be axially reciprocated in the pressure relief chamber, and an end of the pressure relief valve core close to the pressure relief valve port is provided with a stop portion, and the stop portion is arranged opposite to the pressure relief valve port; and A first elastic member is disposed in the pressure relief chamber, wherein a first end of the first elastic member abuts against an end of the pressure relief valve core away from the pressure relief valve port. The pressure limiting valve has an overpressure state and a steady pressure state, wherein: In the overpressure state, the gas in the pressure stabilizing chamber flows to the pressure relief valve port and pushes the pressure relief valve core to move, so that a gap is formed between the stopper and the pressure relief valve port, and the pressure relief valve port is connected; In the pressure-stabilizing state, the pressure relief valve core moves under the elastic force of the first elastic member, so that the stop portion stops at the pressure relief valve port, and the pressure relief valve port is cut off.

2. The pressure limiting valve according to claim 1, characterized in that: The pressure relief valve core comprises: A main body having an end surface for the first elastic member to stop, and a gap is formed between a side wall of the main body and a side wall of the pressure relief chamber; The stopper is arranged at an end of the main body close to the pressure relief valve port; and The limiting portion is axially protrudingly arranged at the end of the main body away from the pressure relief valve port, and the first end of the first elastic member is sleeved on the outer wall of the limiting portion to abut against the end surface of the main body.

3. The pressure limiting valve according to claim 1, characterized in that: The pressure relief chamber has an air relief port connected to the outside, and a mounting portion is further provided in the pressure relief chamber. The mounting portion is closer to the air relief port than the pressure relief valve core, and a through hole is axially opened in the mounting portion, one end of the through hole is used to communicate with the pressure relief valve port, and the other end is used to communicate with the air relief port, and a radially protruding stop section is provided on one side of the inner wall of the mounting portion close to the air relief port, and the second end of the first elastic member extends into the through hole and abuts against the stop section.

4. The pressure limiting valve according to claim 3, characterized in that: The outer diameter of the pressure relief valve core is larger than the aperture of the through hole. When the pressure relief valve port is connected, the pressure relief valve core presses against the end of the mounting portion close to the pressure relief valve core. The end of the mounting portion close to the pressure relief valve core is formed with a groove communicating with the through hole. The groove is configured to connect the through hole and the pressure relief valve port when the pressure relief valve port is connected.

5. The pressure limiting valve according to claim 3, characterized in that: A retaining ring is also provided in the pressure relief chamber, and the retaining ring is stopped between the mounting portion and the air relief port.

6. The pressure limiting valve according to claim 1, characterized in that: The material of the stopper is rubber.

7. The pressure limiting valve according to claim 1, characterized in that: A sealing ring is installed at the pressure relief valve port, and the stop portion is configured to abut against the sealing ring when the pressure relief valve port is closed.

8. The pressure limiting valve according to claim 1, characterized in that: The valve body also has a high-pressure chamber, the high-pressure chamber has an air inlet, the pressure-stabilizing chamber has an air outlet, and the pressure relief chamber has an air leakage port. The air inlet and the air outlet are respectively facing the front and rear sides of the valve body, and the air leakage port is facing the left side or right side of the valve body.

9. The pressure limiting valve according to any one of claims 1 to 8, characterized in that: The valve body further comprises a high-pressure chamber, the connection between the high-pressure chamber and the pressure-stabilizing chamber forms a pressure-limiting valve port, and the pressure-limiting valve further comprises: A pressure-limiting valve core is movably disposed in the high-pressure chamber and is arranged opposite to the pressure-limiting valve port so as to be able to open or close the pressure-limiting valve port; a second elastic member, one end of which abuts against the end of the pressure-limiting valve core away from the pressure-limiting valve port to provide an elastic force for driving the pressure-limiting valve core to move so that the pressure-limiting valve core closes the pressure-limiting valve port; and The push rod assembly is used to drive the pressure-limiting valve core to move so as to open the pressure-limiting valve port.

10. The pressure limiting valve according to claim 9, characterized in that: The pressure limiting valve further comprises a cover body, wherein the cover body and the valve body are mutually matched along the moving direction of the pressure limiting valve core. The push rod assembly includes a diaphragm disposed between the cover body and the valve body and a valve stem vertically connected to the diaphragm, wherein the bottom end of the valve stem abuts against the top end of the pressure-limiting valve core. A drainage cavity is defined between the diaphragm and the valve body, a cover cavity is defined between the diaphragm and the cover body, and the drainage cavity is communicated with the pressure stabilizing cavity. The push rod assembly also includes a third elastic member disposed in the cover body cavity, and a first end of the third elastic member abuts against the diaphragm to provide an elastic force for driving the diaphragm to move so that the pressure-limiting valve core is connected to the pressure-limiting valve port.

11. The pressure limiting valve according to claim 10, characterized in that: The top end of the cover body is threadedly connected with an adjusting screw, and the adjusting screw extends into the cover body cavity to press the second end of the third elastic member.

12. The pressure limiting valve according to claim 11, characterized in that: The bottom end of the adjusting screw is connected to a first washer, the top end of the diaphragm is connected to a second washer, the first end of the third elastic member abuts against the second washer, and the second end of the third elastic member abuts against the first washer.

13. The pressure limiting valve according to claim 10, characterized in that: A gasket is arranged between the diaphragm and the cover body.

14. A seat adjustment system, characterized in that: The invention comprises the pressure limiting valve according to any one of claims 1 to 13.

15. A vehicle, characterized in that: Includes the seat adjustment system as claimed in claim 14.

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