Positive and negative pressure relief valve

Abstract

The application provides a positive and negative pressure relief valve, comprising a valve body, a negative pressure relief passage arranged in the valve body, a negative pressure structure movably arranged in the negative pressure relief passage and used for opening or closing the negative pressure relief passage, a positive pressure structure arranged in the negative pressure structure and used for positive pressure protection, and a negative pressure upper spring seat movably arranged in the negative pressure relief passage. The negative pressure upper spring seat is internally provided with a positive pressure relief passage, and the positive pressure structure is arranged in the positive pressure relief passage and used for opening or closing the positive pressure relief passage. The application adopts the technical means of nested integration of the negative pressure structure and the positive pressure structure, embeds the positive pressure structure assembly in the interior of the movable negative pressure upper spring seat, forms the independent positive pressure relief passage combined with the negative pressure relief passage in the valve body, realizes the technical effect that the positive pressure and the negative pressure can be simultaneously relieved and protected, and simultaneously optimizes the space utilization rate of the valve body.

Description

Technical Field

[0001] This application relates to the field of valves, and more specifically, to a positive and negative pressure relief valve. Background Technology

[0002] Pressure relief valves are a special branch of the valve family. Their uniqueness lies in the fact that, unlike other valves that merely function as switches, they play a crucial role in protecting equipment. With the rapid development of my country's economy, there is an increasing number of projects involving pressure-controlled equipment. Given the need for pressure relief, pressure relief valves play a vital role in protecting equipment. Existing pressure relief valves generally only provide positive or negative pressure protection for pressure systems, not both simultaneously.

[0003] Due to the need to adapt to different application scenarios and continuous product innovation, the structure and performance of pressure relief valves are constantly being improved. Developing new pressure relief valve products that meet market demands is therefore essential. Currently, commonly used pressure relief valves on the market generally fall into two categories: positive pressure relief valves, which can only provide positive pressure protection in positive pressure systems; and negative pressure relief valves, which can only provide negative pressure protection in negative pressure systems. Utility Model Content

[0004] In view of one of the defects in the prior art, the purpose of this application is to provide a positive and negative pressure relief valve.

[0005] A first aspect of this application provides a positive and negative pressure relief valve, comprising:

[0006] The valve body is provided with a negative pressure relief passage.

[0007] A negative pressure structure is movably disposed within the negative pressure relief passage for opening or closing the negative pressure relief passage.

[0008] A positive pressure structure is installed inside the negative pressure structure for positive pressure protection;

[0009] The negative pressure structure includes a negative pressure valve core, which is movably disposed within the negative pressure relief passage for opening or closing the negative pressure relief passage.

[0010] The negative pressure valve core has a positive pressure relief passage inside, and the positive pressure structure is set in the positive pressure relief passage to open or close the positive pressure relief passage.

[0011] Optionally, the negative pressure structure further includes: a negative pressure spring, an upper negative pressure spring seat, and a lower negative pressure spring seat;

[0012] The negative pressure upper spring seat is disposed on the outer periphery of one end of the negative pressure valve core;

[0013] The negative pressure spring seat is sleeved on the outer periphery of the negative pressure spring seat and fixed in the valve body;

[0014] One end of the negative pressure spring abuts against one end of the lower negative pressure spring seat, and the other end abuts against the upper negative pressure spring seat. The upper negative pressure spring seat and the lower negative pressure spring seat are used to limit the position of the negative pressure spring.

[0015] Optionally, the negative pressure upper spring seat extends outward from the outer peripheral wall of the negative pressure valve core, is integrally formed with the negative pressure valve core, and is movable in the negative pressure relief passage along with the negative pressure valve core;

[0016] The upper negative pressure spring seat has an annular mounting groove at one end near the lower negative pressure spring seat, and the other end of the negative pressure spring is disposed in the annular mounting groove.

[0017] Optionally, the positive and negative pressure relief valve further includes an elastic retaining ring disposed at one end of the negative pressure spring seat that abuts against the negative pressure spring, located inside the valve body, for fixing the negative pressure spring seat inside the valve body.

[0018] Optionally, the negative pressure lower spring seat is provided with a negative pressure relief hole that penetrates the negative pressure lower spring seat, so that after the negative pressure valve core opens the negative pressure relief passage, gas enters the valve body through the negative pressure relief hole to relieve pressure.

[0019] Optionally, the positive pressure structure includes:

[0020] A positive pressure valve core is disposed at one end of the positive pressure relief passage and located inside the negative pressure valve core, and is used to open or close the inlet of the positive pressure relief passage;

[0021] A positive pressure spring, one end of which abuts against the positive pressure valve core;

[0022] A positive pressure spring seat is located at the other end of the positive pressure relief passage and is fixedly connected to the negative pressure valve core.

[0023] The other end of the positive pressure spring abuts against the positive pressure spring seat.

[0024] Optionally, the positive pressure valve core is provided with a positive pressure sealing ring at one end of the inlet to seal the inlet of the positive pressure relief passage.

[0025] Optionally, the positive pressure spring seat has a hollow structure inside and is connected to the positive pressure relief passage, used to release positive pressure when the positive pressure valve core opens the positive pressure relief passage;

[0026] The positive pressure valve core has a limiting groove inside, and one end of the positive pressure spring is located in the limiting groove.

[0027] Optionally, the positive pressure valve core is provided with a valve hole that communicates with the limiting groove, so that when the positive pressure opens the positive pressure valve core, it enters the positive pressure relief passage through the valve hole.

[0028] Optionally, the positive and negative pressure relief valve further includes a valve cover disposed at one end of the valve body. The valve cover has multiple openings that are evenly spaced along the circumference of the valve cover for negative pressure intake or positive pressure release.

[0029] This application provides a positive and negative pressure relief valve that uses a nested integration of negative and positive pressure structures. The positive pressure protection component is built into the movable negative pressure upper spring seat, forming an independent positive pressure relief passage combined with the negative pressure relief passage in the valve body. This optimizes the space utilization of the valve body, thereby achieving the technical effect of simultaneously providing pressure relief protection for both positive and negative pressure. Attached Figure Description

[0030] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0031] Figure 1 This is a schematic diagram illustrating the structure of a positive and negative pressure relief valve according to an exemplary embodiment;

[0032] Figure 2 This is a schematic diagram illustrating the external structure of a positive and negative pressure relief valve according to an exemplary embodiment;

[0033] Figure 3 This is a schematic diagram illustrating the structure of a positive pressure structure within a negative pressure valve core according to an exemplary embodiment;

[0034] Figure 4 This is a schematic diagram of the structure of a positive pressure valve core according to an exemplary embodiment;

[0035] Figure 5 This is a cross-sectional view of a positive pressure valve core according to an exemplary embodiment;

[0036] Figure 6 This is a schematic diagram illustrating a negative pressure structure according to an exemplary embodiment;

[0037] Figure 7 This is a cross-sectional view of a negative pressure structure according to an exemplary embodiment.

[0038] In the diagram: 1. Valve body; 2. Positive pressure structure; 21. Positive pressure valve core; 211. Valve hole; 212. Limiting groove; 22. Positive pressure spring seat; 23. Positive pressure spring; 24. Positive pressure sealing ring; 25. Inlet; 3. Negative pressure structure; 31. Negative pressure valve disc; 32. Negative pressure valve core; 321. Upper negative pressure spring seat; 322. Annular mounting groove; 33. Lower negative pressure spring seat; 331. Negative pressure vent; 34. Negative pressure spring; 35. Negative pressure seal; 36. Nut; 4. Valve cover; 41. Opening; 5. Elastic retaining ring. Detailed Implementation

[0039] The present application will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present application, but do not limit the present application in any way. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present application, and these all fall within the protection scope of the present application. Parts not described in detail in the following embodiments can be implemented using existing technology.

[0040] In the description of the embodiments of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0041] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature.

[0042] In the description of the embodiments in this application, "multiple" means two or more, unless otherwise explicitly specified. In this application, unless otherwise explicitly specified and limited, the terms "installed," "connected," "linked," "fixed," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0043] The terms "comprising" and "having," and any variations thereof, in the embodiments of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such processes, methods, products, or devices.

[0044] Currently, commonly used pressure relief valves on the market are generally either positive pressure relief valves, which can only provide positive pressure protection in positive pressure systems, or negative pressure relief valves, which can only provide negative pressure protection in negative pressure systems. Based on the above problems, this application provides a positive and negative pressure relief valve to solve these issues.

[0045] Reference Figure 1 As shown in one embodiment of this application, a positive and negative pressure relief valve includes: a valve body 1, a positive pressure structure 2, and a negative pressure structure 3. The valve body 1 has a negative pressure relief passage; the negative pressure structure 3 is movably disposed within the negative pressure relief passage for opening or closing the negative pressure relief passage; the positive pressure structure 2 is disposed within the negative pressure structure 3 for positive pressure protection; wherein, the negative pressure structure 3 includes a negative pressure valve core 32, which is movably disposed within the negative pressure relief passage for opening or closing the negative pressure relief passage; the negative pressure valve core 32 has a positive pressure relief passage inside, and the positive pressure structure 2 is disposed within the positive pressure relief passage for opening or closing the positive pressure relief passage.

[0046] Specifically, by nesting and integrating the negative pressure structure 3 and the positive pressure structure 2, the negative pressure valve core 32 is used as a movable control unit, and a negative pressure relief passage is formed between the outer peripheral wall of the negative pressure valve core 32 and the inner wall of the valve body 1. When the negative pressure in the relief valve exceeds the set pressure, the negative pressure relief passage in the valve body 1 gradually opens to achieve staged negative pressure release. When the positive pressure in the relief valve exceeds the set pressure, the positive pressure structure 2 in the negative pressure valve core 32 opens the positive pressure relief passage and automatically releases the positive pressure, thus achieving independent and precise control of negative pressure and positive pressure protection.

[0047] In this embodiment, a nested integrated design of negative pressure structure 3 and positive pressure structure 2 is adopted, with the positive pressure protection component built into the movable negative pressure valve core 32, forming a dual-level pressure response mechanism. Through the axial nested layout of independent positive pressure relief passages and negative pressure relief passages, the space utilization rate is improved. At the same time, it is ensured that the positive pressure structure 2 and negative pressure structure 3 can work independently of each other when positive pressure is released and negative pressure is released, so as to realize pressure relief protection for both positive and negative pressure at the same time. This solves the problems of the existing pressure relief valve having a single functional structure and a large volume of structure for both positive and negative pressure relief protection.

[0048] Reference Figure 5As shown, to improve the stability of the negative pressure structure 3, in some specific embodiments of this application, the negative pressure structure 3 further includes: an upper negative pressure spring seat 321, a negative pressure spring 34, and a lower negative pressure spring seat 33. The upper negative pressure spring seat 321 is disposed on the outer periphery of one end of the negative pressure valve core 32; the negative pressure spring 34 is sleeved on the outer periphery of the upper negative pressure spring seat 32; the lower negative pressure spring seat 33 is sleeved on the outer periphery of the upper negative pressure spring seat 32 and fixed on the inner wall of the negative pressure relief passage to fix the position of the negative pressure spring 34; one end of the negative pressure spring 34 abuts against the other end of the lower negative pressure spring seat 33, and the other end abuts against the upper negative pressure spring seat 32.

[0049] It should be noted that the negative pressure upper spring seat 321 extends outward from one end of the negative pressure valve core 32 and is integrally formed with the negative pressure valve core 32. The inner wall of the negative pressure relief passage is the inner circumferential wall of the valve body 1.

[0050] Specifically, by connecting one end of the negative pressure upper spring seat 32 to the negative pressure valve core 31, and fixing the negative pressure spring 34 between the negative pressure lower spring seat 33 and the negative pressure upper spring seat 32, when the negative pressure in the pressure relief valve is greater than the set pressure of the negative pressure valve core 31, the excessive negative pressure will pull the negative pressure valve core 31 downward, thereby allowing gas to flow from the top down into the pressure system, reducing the negative pressure of the pressure system.

[0051] In the above embodiments of this application, the negative pressure upper spring seat 32 is movably disposed inside the valve body 1, and is fixedly connected to the negative pressure upper spring seat 32 by the negative pressure valve core 31. The negative pressure valve core 31 and the upper spring seat are designed as an integral unit to ensure that the spring compression force of the negative pressure spring 34 acts stably on the sealing surface, thereby improving the stability of the negative pressure structure 3 during operation. At the same time, when the pressure relief valve is subjected to negative pressure exceeding the set pressure value, the negative pressure valve core 31 drives the negative pressure upper spring seat 32 to move downward through the negative pressure, opening the negative pressure relief channel and realizing negative pressure protection.

[0052] Reference Figure 7 As shown, in order to improve the stability of the negative pressure spring 34 in the negative pressure structure 3, in some specific embodiments of this application, the upper negative pressure spring seat 321 extends outward from the outer peripheral wall of the negative pressure valve core 32 and is integrally formed with the negative pressure valve core 32, and can move with the negative pressure valve core 32 in the negative pressure relief passage; the upper negative pressure spring seat 321 is provided with an annular mounting groove 322 at one end near the lower negative pressure spring seat 33, and the other end of the negative pressure spring 34 is disposed in the annular mounting groove 322.

[0053] It also includes a negative pressure valve disc 31, a negative pressure valve disc 32 fixed to the other end of the negative pressure valve core 32 by a nut 36, a negative pressure sealing element 35 between the negative pressure valve disc 31 and the valve body 1 for sealing the valve body 1 and the negative pressure valve disc 31; and a negative pressure lower spring seat 33 disposed between the negative pressure valve disc 31 and the negative pressure upper spring seat 321.

[0054] In the above embodiments of this application, a negative pressure upper spring seat 321 is provided on the peripheral wall of the other end of the negative pressure upper spring seat 32, and an annular mounting groove 322 is provided at the end of the negative pressure upper spring seat 321 near the negative pressure lower spring seat 33 to restrict the movement of the negative pressure spring 34; at the same time, the negative pressure lower spring seat 33 is provided between the negative pressure valve core 31 and the negative pressure upper spring seat 321, and the negative pressure lower spring seat 33 is fixed on the inner wall of the valve body 1 to provide support for the negative pressure spring 34 during operation and improve the stability of the negative pressure spring 34.

[0055] Specifically, the outer peripheral wall of the negative pressure upper spring seat 321 and the negative pressure upper spring seat 32 are integrally formed, and the cross-section is a "T" shaped structure.

[0056] Reference Figure 6 As shown, in order to prevent the negative pressure relief passage from being blocked by the negative pressure spring seat 33, in some specific embodiments of this application, the negative pressure relief hole 331 is provided on the negative pressure spring seat 33, which penetrates the negative pressure spring seat 33, so that after the negative pressure valve core 31 opens the negative pressure relief passage, the gas enters the valve body 1 through the negative pressure relief hole 331 to relieve pressure.

[0057] It should be noted that there are multiple negative pressure relief holes 331, which are evenly spaced on the negative pressure spring 33.

[0058] In the above embodiments of this application, by providing a negative pressure relief hole 331 on the negative pressure spring seat 33, the negative pressure spring 34 is provided with stable support. After the negative pressure relief channel is opened, gas can enter the pressure system through the negative pressure relief hole 331 and flow into the pressure system, thereby reducing the negative pressure of the pressure system.

[0059] During operation, when the negative pressure in the pressure system exceeds the set pressure of the negative pressure spring 34, the excessive negative pressure will draw the negative pressure valve core 31 downward, allowing gas to flow from the top down into the pressure system, thus reducing the negative pressure of the pressure system. When the negative pressure drops below the set negative pressure, the negative pressure valve core 31 will automatically close under the spring force of the negative pressure spring 34, completing the release of excessive negative pressure.

[0060] Reference Figure 3 As shown, in order to enable the positive pressure structure 2 to work independently within the positive pressure relief passage, in some specific embodiments of this application, the positive pressure structure 2 includes: a positive pressure valve core 21, a positive pressure spring seat 22, and a positive pressure spring 23. The positive pressure valve core 21 is disposed at one end of the positive pressure relief passage and is used to open or close the inlet 25 of the positive pressure relief passage; one end of the positive pressure spring 23 abuts against the positive pressure valve core 21; the positive pressure spring seat 22 is disposed at the other end of the positive pressure relief passage and is fixedly connected to the negative pressure upper spring seat 32, and the other end of the positive pressure spring 23 abuts against the positive pressure spring seat 22.

[0061] Specifically, by placing the positive pressure valve core 21 inside the negative pressure upper spring seat 32 and at one end of the positive pressure relief passage, the inlet 25 of the positive pressure relief passage is blocked. The two ends of the positive pressure spring 23 abut against the positive pressure valve core 21 and the positive pressure spring seat 22 respectively. When the positive pressure at the inlet 25 exceeds the extension force of the positive pressure spring 23, the positive pressure valve core 21 moves, opening the positive pressure relief passage inside the negative pressure upper spring seat 32, and automatically releasing the positive pressure.

[0062] It should be noted that the positive pressure relief passage inside the negative pressure upper spring seat 32 is a "funnel-shaped structure". One end of the positive pressure relief passage is at the outlet end of the "funnel-shaped structure". The positive pressure valve core 21 has the same structure as the positive pressure relief passage and can seal the positive pressure relief passage.

[0063] In the above embodiments of this application, during the release of excessive positive pressure, the negative pressure upper spring seat 32 does not move within the valve body 1, and the positive pressure structure 2 operates independently. When the positive pressure in the pressure system exceeds the set pressure of the positive pressure spring 23, the positive pressure will push the positive pressure valve core 21 and the positive pressure spring 23 upwards, so that the excessive positive pressure flows upwards from the lower part of the pressure relief valve, thereby releasing the positive pressure. When the pressure is released to a level lower than the set positive pressure, the positive pressure valve core 21 automatically closes under the action of the spring force of the positive pressure spring 23, completing one release of positive pressure.

[0064] In some specific embodiments of this application, a positive pressure sealing ring 24 is provided at one end of the positive pressure valve core 21 that blocks the inlet 25, for sealing the inlet 25 of the positive pressure relief passage.

[0065] By setting a positive pressure sealing ring 24, the sealing performance of the positive pressure valve core 21 within the negative pressure valve core 32 is improved.

[0066] Reference Figure 4 As shown, in order to avoid the positive pressure spring seat 22 blocking the positive pressure relief channel and to improve the stability of the positive pressure spring 23, in some specific embodiments of this application, the positive pressure spring seat 22 has a hollow structure inside, which is connected to the positive pressure relief passage and is used to release positive pressure when the positive pressure valve core 21 opens the positive pressure relief passage; the positive pressure valve core 21 is provided with a limiting groove 212 inside, and one end of the positive pressure spring 23 is set in the limiting groove 212.

[0067] In the above embodiments of this application, by setting the interior of the positive pressure spring seat 22 to a hollow structure, it is fixed to the negative pressure spring seat 32 while communicating with the positive pressure relief channel, thus preventing the positive pressure structure 2 from blocking the positive pressure relief channel during positive pressure relief. A limiting groove 212 is provided inside the positive pressure valve core 21, and one end of the positive pressure spring 23 is placed within the limiting groove 212, improving the stability of the positive pressure spring 23 within the positive pressure relief channel.

[0068] Specifically, when the positive pressure structure 2 of the positive and negative pressure relief valve of this application is working, the process of releasing excessive positive pressure is as follows: when the positive pressure in the pressure system exceeds the set pressure of the positive pressure spring 23, the positive pressure will push the positive pressure valve core 21 and the positive pressure spring 23 upward from the valve hole 211 in the middle of the positive pressure valve core 21, so that the excessive positive pressure flows upward from the lower part of the pressure relief valve, realizing the release of positive pressure. When the pressure is released to a level lower than the positive pressure set by the positive pressure spring 23, the positive pressure valve core 21 automatically closes under the spring force of the positive pressure spring 23, completing one release of positive pressure.

[0069] Reference Figure 5 As shown, it should be noted that the positive pressure valve core 21 is provided with a valve hole 211 that communicates with the limiting groove 212, so that when the positive pressure opens the positive pressure valve core 21, it enters the positive pressure relief passage through the valve hole 211.

[0070] Specifically, when the positive pressure exceeds the pressure of the positive pressure spring 23, the positive pressure will push the positive pressure valve core 21 open, and the positive pressure will enter the positive pressure relief passage through the valve hole 211 on the positive pressure valve core 21 for positive pressure relief.

[0071] To improve the stability of the negative pressure spring seat 33 within the valve body 1, the positive and negative pressure relief valve also includes an elastic retaining ring 5, which is located at the end where the negative pressure spring seat 33 abuts against the negative pressure spring 34, inside the valve body 1, and is used to fix the negative pressure spring seat 33 inside the valve body 1.

[0072] Specifically, by setting the elastic retaining ring 5 to fix the negative pressure lower spring seat 33, the negative pressure lower spring seat 33 is prevented from moving inside the valve body 1 when the negative pressure spring 34 extends and retracts, thereby improving the stability of the pressure relief valve.

[0073] Reference Figure 2 As shown in some specific embodiments of this application, the positive and negative pressure relief valve may further include a valve cover 4, which is disposed at one end of the valve body 1. The valve cover 4 has a plurality of openings 41, which are evenly spaced along the circumference of the valve cover 4 for negative pressure intake or positive pressure release.

[0074] It should be noted that the pressure relief valve uses a threaded connection, making installation very convenient.

[0075] The preferred features in the above embodiments can be used individually in any embodiment, or in any combination thereof, provided they do not conflict with each other. Furthermore, parts not described in detail in the embodiments can be implemented using existing technologies.

[0076] The positive and negative pressure relief valves in the above embodiments of this application can be applied to pressure systems that require both positive and negative pressure protection simultaneously. After installing the relief valve of this application, both positive and negative pressure protection can be obtained simultaneously, thereby ensuring that the system pressure operates stably within the required pressure range. Furthermore, the relief valve has a compact structure and is easy to install.

[0077] The foregoing has described some specific embodiments of this application. It should be understood that this application is not limited to the specific embodiments described above, and those skilled in the art can make various modifications or variations within the scope of the claims, which do not affect the substantive content of this application. The above-described preferred features can be used in any combination without conflict.

Claims

1. A positive and negative pressure relief valve, characterized in that, include: The valve body is provided with a negative pressure relief passage; A negative pressure structure is movably disposed within the negative pressure relief passage for opening or closing the negative pressure relief passage. A positive pressure structure is installed inside the negative pressure structure for positive pressure protection; The negative pressure structure includes a negative pressure valve core, which is movably disposed within the negative pressure relief passage for opening or closing the negative pressure relief passage. The negative pressure valve core has a positive pressure relief passage inside, and the positive pressure structure is set in the positive pressure relief passage to open or close the positive pressure relief passage.

2. The positive and negative pressure relief valve according to claim 1, characterized in that, The negative pressure structure also includes: a negative pressure spring, an upper negative pressure spring seat, and a lower negative pressure spring seat; The negative pressure upper spring seat is disposed on the outer periphery of one end of the negative pressure valve core; The negative pressure spring seat is sleeved on the outer periphery of the negative pressure spring seat and fixed in the valve body; One end of the negative pressure spring abuts against one end of the lower negative pressure spring seat, and the other end abuts against the upper negative pressure spring seat. The upper negative pressure spring seat and the lower negative pressure spring seat are used to limit the position of the negative pressure spring.

3. A positive and negative pressure relief valve according to claim 2, characterized in that, The negative pressure upper spring seat extends outward from the outer peripheral wall of the negative pressure valve core and is integrally formed with the negative pressure valve core, and can move along with the negative pressure valve core in the negative pressure relief passage; The upper negative pressure spring seat has an annular mounting groove at one end near the lower negative pressure spring seat, and the other end of the negative pressure spring is disposed in the annular mounting groove.

4. A positive and negative pressure relief valve according to claim 2, characterized in that, The positive and negative pressure relief valve also includes an elastic retaining ring, which is disposed at the end of the negative pressure spring seat that abuts against the negative pressure spring and is located inside the valve body, for fixing the negative pressure spring seat inside the valve body.

5. A positive and negative pressure relief valve according to claim 2, characterized in that, The negative pressure spring seat is provided with a negative pressure relief hole that penetrates the negative pressure spring seat. This hole allows gas to enter the valve body for pressure relief after the negative pressure valve core opens the negative pressure relief passage.

6. A positive and negative pressure relief valve according to claim 3, characterized in that, The positive pressure structure includes: A positive pressure valve core is disposed at one end of the positive pressure relief passage and located inside the negative pressure valve core, and is used to open or close the inlet of the positive pressure relief passage; A positive pressure spring, one end of which abuts against the positive pressure valve core; A positive pressure spring seat is located at the other end of the positive pressure relief passage and is fixedly connected to the negative pressure valve core. The other end of the positive pressure spring abuts against the positive pressure spring seat.

7. A positive and negative pressure relief valve according to claim 6, characterized in that, The positive pressure valve core is provided with a positive pressure sealing ring at one end of the inlet, which is used to seal the inlet of the positive pressure relief passage.

8. A positive and negative pressure relief valve according to claim 6, characterized in that, The positive pressure spring seat has a hollow structure inside and is connected to the positive pressure relief passage, and is used to release positive pressure when the positive pressure valve core opens the positive pressure relief passage; The positive pressure valve core has a limiting groove inside, and one end of the positive pressure spring is located in the limiting groove.

9. A positive and negative pressure relief valve according to claim 8, characterized in that, The positive pressure valve core is provided with a valve hole that communicates with the limiting groove, so that when the positive pressure opens the positive pressure valve core, it enters the positive pressure relief passage through the valve hole.

10. A positive and negative pressure relief valve according to any one of claims 1-9, characterized in that, The positive and negative pressure relief valve also includes a valve cover, which is disposed at one end of the valve body. The valve cover has multiple openings that are evenly spaced along the circumference of the valve cover for negative pressure intake or positive pressure release.

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