A pressure relief valve

Abstract

The utility model provides a kind of pressure relief valve, it is related to pressure relief technical field.Sealing lip in sealing assembly has elasticity and is provided with the inclined section that is inclined along pressure relief direction, so that it can reliably fit the periphery of valve core to form seal when the pressure in valve cavity is lower than set opening pressure, it can be pushed away from valve core again when pressure reaches set opening pressure, so as to quickly open exhaust passage, realize sensitive, reliable pressure relief response, and make exhaust passage form annular large-area exhaust window, compared with the small diameter structure of traditional safety valve can provide significantly improved pressure relief flow, meet the large capacity lithium battery box for non-coal mine in abnormal gas production state Large flow, fast pressure relief demand, effectively avoid the bulging of box or structural damage caused by pressure accumulation.In addition, sealing lip uses elastic attachment instead of rupture type structure, not easy to be affected by dust adhesion, no rupture or blockage problem common in diaphragm type structure occurs.

Description

Technical Field

[0001] This utility model relates to the field of pressure relief technology, and in particular to a pressure relief valve. Background Technology

[0002] In non-coal mining, electrified equipment mostly uses large-capacity lithium battery packs as power batteries. Lithium batteries continuously produce electrolyte vapor and hydrogen gas when experiencing abnormal charging / discharging, cell overheating, or minor short circuits. If these gases cannot be expelled from the battery pack in time, the internal pressure will gradually increase, potentially causing pack deformation, damage to the sealing structure, and even further degradation of the battery cells. Therefore, lithium battery packs need to be equipped with a pressure relief device capable of rapid venting.

[0003] When existing non-explosion-proof pressure relief devices are used in non-coal mine lithium battery boxes, the following problems exist: One type adopts a "safety valve" structure, which releases pressure by opening and closing the valve core. However, the valve core diameter is small, and the pressure release flow can only meet the needs of small lithium battery packs. For lithium battery boxes with a capacity of 50kWh or more used in non-coal mines, the gas production rate is much greater than the exhaust rate, which can easily lead to "pressure accumulation" and cause local bulging of the box.

[0004] Another type uses a "diaphragm" structure. When the pressure reaches the preset value, the diaphragm ruptures and releases gas. However, in non-coal mining environments, dust easily adheres to the diaphragm surface, causing the diaphragm to rupture accidentally before reaching the design pressure, or dust to block the diaphragm exhaust port, resulting in pressure relief failure. Moreover, the machine needs to be stopped and replaced after the diaphragm ruptures, which seriously affects the continuous operation efficiency of non-coal mining equipment.

[0005] Therefore, there is an urgent need to design a pressure relief valve device for non-coal lithium battery boxes to meet the demand for large-flow pressure relief and ensure stable and reliable operation under harsh conditions such as dust accumulation and equipment vibration in non-coal mine sites. Utility Model Content

[0006] One objective of this invention is to provide a pressure relief valve that solves the technical problems of pressure relief devices in the prior art, such as bulging, accidental rupture, and pressure relief failure.

[0007] Another objective of this invention is to improve the service life of the sealing lip.

[0008] Specifically, this utility model provides a pressure relief valve, comprising: The valve body has a valve cavity and an axially arranged exhaust passage inside, and the valve body also has a mounting groove communicating with the exhaust passage. A valve core is installed inside the valve cavity and connected to the valve body; A sealing assembly is installed in the mounting groove. The sealing assembly includes at least one sealing lip and at least one locking plate. The sealing lip is sleeved on the outer periphery of the valve core. The sealing lip is elastic and has an inclined section that slopes in the direction of pressure relief. The inclined section is located in the exhaust passage. The locking plate is used to lock the sealing lip in the mounting groove. The inclined section of the sealing lip is configured to contact the valve core when the pressure in the valve cavity is less than the set opening pressure, thereby sealing the exhaust passage; and to separate from the valve core when the pressure in the valve cavity is greater than or equal to the set opening pressure, thereby opening the exhaust passage for exhaust and pressure relief.

[0009] Optionally, when the pressure in the valve cavity is less than the set opening pressure, the included angle between the sealing lip and the valve core is in the range of 30°-60°.

[0010] Optionally, the sealing lip further includes a fixing section, which is installed in the mounting groove and connected to the inclined section, and the fixing section is in contact with the locking piece.

[0011] Optionally, the mounting groove has an opening and a bottom wall arranged opposite to the opening; The sealing assembly includes multiple sealing lips and multiple locking plates, which are arranged alternately, with one of the sealing lips abutting against the bottom wall of the mounting groove.

[0012] Optionally, the locking piece has an annular groove on its first end face near the corresponding sealing lip.

[0013] Optionally, the mounting groove further includes an annular sidewall arranged perpendicular to the bottom wall; The locking piece also includes an outer wall, which abuts against the annular sidewall of the mounting groove, and the connection between the outer wall of the locking piece and the first end face is provided with a tapered chamfer.

[0014] Optionally, the locking plate further includes an inner wall, which is spaced apart from the valve core, and the connection between the inner wall of the locking plate and the first end face is provided with a rounded chamfer.

[0015] Optionally, the valve core includes a first part and a second part. The outer periphery of the first part is provided with a first thread, and the interior of the valve body is provided with a second thread that engages with the first thread. The second part is arranged correspondingly to the inclined portion of the sealing lip.

[0016] Optionally, the valve body includes a third part and a fourth part, the third part having a third thread on its outer periphery, and the fourth part having a groove on its outer periphery; the pressure relief valve further includes: A protective cap is fitted over the outside of the fourth part and has a gap between it and the valve body. The protective cap has a threaded hole corresponding to the groove. A fastening screw passes through the threaded hole and abuts against the groove, thereby connecting the protective cap to the valve body; A locking washer is fitted onto the outer periphery of the third part and tightened with the third thread.

[0017] Optionally, the exhaust passage includes a plurality of pressure relief holes arranged circumferentially along the valve body; The sealing lip is made of polytetrafluoroethylene.

[0018] In this invention, firstly, the sealing lip in the sealing assembly is elastic and has an inclined section that slopes in the direction of pressure relief. This allows it to reliably adhere to the outer circumference of the valve core to form a seal when the pressure inside the valve cavity is lower than the set opening pressure. When the pressure reaches the set opening pressure, it can be quickly pushed away from the valve core, thereby rapidly opening the exhaust channel and achieving a sensitive and reliable pressure relief response. Secondly, the inclined section can be lifted away from the valve core as a whole when open, forming a large-area annular exhaust window in the exhaust channel. Compared with the small-diameter structure of traditional safety valves, this provides a significantly increased pressure relief flow rate, meeting the high-flow, rapid pressure relief requirements of large-capacity lithium battery boxes used in non-coal mines under abnormal gas generation conditions, effectively preventing box bulging or structural damage caused by pressure accumulation. Furthermore, the sealing lip uses an elastic fit rather than a rupture structure, making it less susceptible to dust adhesion and avoiding the accidental rupture or blockage problems common in diaphragm structures. The sealing lip is fixed in the mounting groove by a locking piece, ensuring the sealing assembly remains stable under vibration conditions, preventing displacement or detachment, and adapting to the high-vibration environment of non-coal mine equipment. Since no breakage components are required, the pressure relief valve can be repeatedly opened and closed, reducing maintenance needs and significantly improving the equipment's continuous operation capability.

[0019] Furthermore, in this invention, the locking piece has an annular groove on the first end face near the corresponding sealing lip, which can ensure that the integrity of the sealing lip is not damaged when it is bent, thereby improving the service life of the sealing lip.

[0020] The above and other objects, advantages and features of this utility model will become more apparent to those skilled in the art from the following detailed description of specific embodiments of this utility model in conjunction with the accompanying drawings. Attached Figure Description

[0021] The following sections will describe some specific embodiments of the present invention in a detailed manner by way of example and not limitation, with reference to the accompanying drawings. The same reference numerals in the drawings denote the same or similar parts or components. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings: Figure 1 This is a schematic structural diagram of a pressure relief valve according to an embodiment of the present invention; Figure 2 yes Figure 1 A schematic cross-sectional view of the valve body of the pressure relief valve shown; Figure 3 yes Figure 1 A schematic cross-sectional view of the valve core of the pressure relief valve shown. Figure 4 yes Figure 1 A schematic cross-sectional view of the sealing lip of the pressure relief valve shown; Figure 5 yes Figure 1 A schematic cross-sectional view of the locking disc of the pressure relief valve shown; Figure 6 yes Figure 1 A schematic cross-sectional view of the protective cap of the pressure relief valve shown; Figure 7 This is a schematic front view of a pressure relief valve according to an embodiment of the present invention.

[0022] Figure label: 100-Pressure relief valve, 10-Valve body, 20-Valve core, 30-Protective cap, 40-Sealing lip, 50-Locking plate, 60-Fasting screw, 70-Locking washer, 11-Third part, 12-Fourth part, 111-Mounting groove, 112-Exhaust passage, 113-Second thread, 114-Third thread, 115-Groove, 116-Bottom wall, 117-Annular sidewall, 21-First part, 22-Second part, 211-First thread, 51-Annular groove, 52-Cone chamfer, 53-Circular chamfer, 31-Threaded hole, 41-Inclined section, 42-Fixed section. Detailed Implementation

[0023] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0024] In the description of this utility model, it should be understood that the terms "upper" and "lower" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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 utility model.

[0025] 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 as "first" or "second" may explicitly or implicitly include at least one of that feature, that is, include one or more of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified. When a feature "includes or contains" one or more of the features it encompasses, unless otherwise specifically described, this indicates that other features are not excluded and may be further included.

[0026] Unless otherwise expressly specified and limited, the terms "connection," "installation," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art should be able to understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0027] Unless otherwise specified, all terms (including technical and scientific terms) used in the description of this embodiment have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0028] Figure 1 This is a schematic structural diagram of a pressure relief valve 100 according to an embodiment of the present invention. Figure 2 yes Figure 1 A schematic cross-sectional view of the valve body 10 of the pressure relief valve 100 shown. Figure 3 yes Figure 1 A schematic cross-sectional view of the valve core 20 of the pressure relief valve 100 shown. Figure 4 yes Figure 1 A schematic cross-sectional view of the sealing lip 40 of the pressure relief valve 100 shown. Figure 5 yes Figure 1 A schematic cross-sectional view of the locking disc 50 of the pressure relief valve 100 shown. Figure 6 yes Figure 1 A schematic cross-sectional view of the protective cap 30 of the pressure relief valve 100 shown. Figure 7 This is a schematic front view of a pressure relief valve 100 according to an embodiment of the present invention.

[0029] like Figures 1 to 7As shown, in a specific embodiment, the pressure relief valve 100 includes a valve body 10, a valve core 20, and a sealing assembly. The valve body 10 has a valve cavity and an axially arranged exhaust passage 112 inside, and also has a mounting groove 111 communicating with the exhaust passage 112 inside. The valve core 20 is installed in the valve cavity and connected to the valve body 10. The sealing assembly is installed in the mounting groove 111 and includes at least one sealing lip 40 and at least one locking piece 50. The sealing lip 40 is sleeved on the outer periphery of the valve core 20, and the sealing lip 40 is elastic and has an inclined section 41 that is inclined in the pressure relief direction. The inclined section 41 is located in the exhaust passage 112. The locking piece 50 is used to lock the sealing lip 40 in the mounting groove 111. The inclined section 41 of the sealing lip 40 is configured to contact the valve core 20 when the pressure in the valve cavity is less than the set opening pressure, thereby closing the exhaust passage 112. When the pressure inside the valve chamber is greater than or equal to the set opening pressure, the valve separates from the valve core 20, thereby opening the exhaust passage 112 for venting and pressure relief. The pressure relief valve 100 of this embodiment is suitable for use in non-coal mining environments, and is particularly well-suited to the rapid pressure relief needs of lithium battery boxes in non-coal mining electric equipment, such as loaders, mining transport vehicles, and tunneling auxiliary equipment. It is especially suitable for use in non-coal mining environments with dust, humidity, rainwater, etc., and can quickly expel gas from the lithium battery box to balance the internal pressure. The pressure relief direction here refers to the direction from the inside of the lithium battery box to the outside. The mounting groove 111 connects with the exhaust passage 112 to form a complete pressure relief channel.

[0030] In this embodiment, firstly, the sealing lip 40 in the sealing assembly is elastic and has an inclined section 41 that slopes in the direction of pressure relief. This allows it to reliably adhere to the outer periphery of the valve core 20 to form a seal when the pressure inside the valve cavity is lower than the set opening pressure. When the pressure reaches the set opening pressure, it can be quickly pushed away from the valve core 20, thereby rapidly opening the exhaust channel 112 and achieving a sensitive and reliable pressure relief response. Secondly, the inclined section 41 can be lifted away from the valve core 20 as a whole when open, making the exhaust channel 112 form a large-area annular exhaust window. Compared with the small-diameter structure of traditional safety valves, this provides a significantly improved pressure relief flow rate, meeting the high-flow-rate and rapid pressure relief requirements of large-capacity lithium battery boxes used in non-coal mines under abnormal gas generation conditions, and effectively avoiding box bulging or structural damage caused by pressure accumulation. In addition, the sealing lip 40 adopts an elastic fit rather than a rupture structure, which is not easily affected by dust adhesion and will not cause the accidental rupture or blockage problems common in diaphragm structures. The sealing lip 40 is fixed in the mounting groove 111 by the locking piece 50, ensuring the stability of the sealing assembly under vibration conditions and preventing displacement or detachment, thus adapting to the high vibration environment of non-coal mining equipment. Since no breakage component is required, the pressure relief valve 100 can be repeatedly opened and closed, reducing maintenance needs and significantly improving the equipment's continuous operation capability.

[0031] In some embodiments, when the pressure inside the valve cavity is less than the set opening pressure, the angle between the sealing lip 40 and the valve core 20 ranges from 30° to 60°, for example, it can be 30°, 40°, 50°, or 60°. When the sealing lip 40 contacts the valve core 20, it can prevent dust, moisture, rainwater, and insects from entering the lithium battery box from outside the valve body 10, reducing maintenance costs and improving equipment operating efficiency. In other embodiments, the angle range between the sealing lip 40 and the valve core 20 can also be determined according to specific design requirements.

[0032] See Figure 1 The end of the exhaust channel 112 facing the inside of the lithium battery is inverted conical, which is mainly used to ensure the smoothness of the exhaust channel 112 when depressurizing.

[0033] See Figure 7 In some embodiments, the exhaust channel 112 includes a plurality of pressure relief holes arranged circumferentially along the valve body 10, with the hole diameter ranging from 1mm to 5mm. The pressure relief holes can be evenly or unevenly distributed along the circumference, and the number of pressure relief holes can be adjusted to adapt to lithium battery boxes of different capacities. For example, a 50kWh-100kWh lithium battery box is configured with 2-5 pressure relief holes, and a 100kWh-200kWh lithium battery box is configured with 6-12 pressure relief holes to ensure that the pressure relief flow rate matches the gas production rate of the lithium battery.

[0034] In some embodiments, the sealing lip 40 further includes a fixing section 42, which is installed in the mounting groove 111 and connected to the inclined section 41. The fixing section 42 is in contact with the locking piece 50. Here, the fixing section 42 and the inclined section 41 are integrally formed, which means that the fixing section 42 is used for the fixed installation of the sealing lip 40, and the inclined section 41 is used for opening and closing the exhaust passage 112.

[0035] In some embodiments, the mounting groove 111 has an opening and a bottom wall 116 arranged opposite to the opening. The sealing assembly includes a plurality of sealing lips 40 and a plurality of locking plates 50, which are arranged alternately, with one sealing lip 40 abutting against the bottom wall 116 of the mounting groove 111. The number of sealing lips 40 and locking plates 50 can be designed according to specific requirements, for example, one, two, or more. The sealing lips 40 and locking plates 50 enter through the opening of the mounting groove 111 and are mounted onto the valve body 10.

[0036] In some embodiments, the locking piece 50 has an annular groove 51 on the first end face near the corresponding sealing lip 40, which can ensure that the integrity of the sealing lip 40 is not damaged when it is bent, thereby improving the service life of the sealing lip 40.

[0037] In some embodiments, the mounting groove 111 further includes an annular sidewall 117 arranged perpendicularly to the bottom wall 116. The locking piece 50 also includes an outer wall that abuts against the annular sidewall 117 of the mounting groove 111, and a tapered chamfer 52 is provided at the connection between the outer wall of the locking piece 50 and the first end face. This embodiment, through the design of the tapered chamfer 52, ensures that the locking piece 50 will not cause cracking on the outer side of the sealing lip 40 when installed into the valve body 10, thereby improving the service life of the sealing lip 40.

[0038] In some embodiments, the locking plate 50 further includes an inner wall, which is spaced apart from the valve core 20, and a rounded chamfer 53 is provided at the connection between the inner wall of the locking plate 50 and the first end face. This embodiment, through the design of the rounded chamfer 53, ensures that the integrity of the sealing lip 40 is not compromised when bent, thereby improving the service life of the sealing lip 40.

[0039] In some embodiments, the valve core 20 includes a first portion 21 and a second portion 22. The outer periphery of the first portion 21 is provided with a first thread 211, and the interior of the valve body 10 is provided with a second thread 113 that engages with the first thread 211. The second portion 22 is arranged correspondingly to the inclined portion of the sealing lip 40. Here, it can be understood that the valve core 20 and the valve body 10 are fixedly connected through the engagement of the first thread 211 and the second thread 113. To ensure installation reliability, the valve core 20 is firmly welded using laser welding on the side near the exhaust passage 112.

[0040] In some embodiments, the outer surface of the second portion 22 of the valve core 20, i.e., the non-threaded area, is a cylindrical surface with a surface roughness of 0.2 or higher. The cylindrical surface is in interference contact with the inclined section 41 of the sealing lip 40 to ensure that the pressure relief valve 100 is in a closed state when not in a pressure relief state, thereby sealing the exhaust passage 112. The tail end of the second portion 22 of the valve core 20 is provided with a slot for mounting the valve core 20.

[0041] In this embodiment, after the fixed section 42 of the sealing lip 40 is pressed by the locking plate 50, the increased friction between the valve body 10 and the annular groove 51 of the locking plate 50 ensures that the sealing lip 40 and the second part 22 of the valve core 20 are in close contact, forming a sealed cavity. After the last locking plate 50 is installed, laser welding is used to firmly weld the locking plate 50 to the valve body 10. Here, the locking plate 50 is made of stainless steel or copper and other metal materials.

[0042] In some embodiments, the valve core 20 is made of stainless steel or copper or other metals.

[0043] In some embodiments, the valve body 10 includes a third portion 11 and a fourth portion 12. The outer periphery of the third portion 11 is provided with a third thread 114, and the outer periphery of the fourth portion 12 is provided with a groove 115. The pressure relief valve 100 also includes a protective cap 30, a fastening screw 60, and a locking washer 70. The protective cap 30 is fitted onto the outside of the fourth portion 12 and has a gap with the valve body 10. The protective cap 30 has a threaded hole 31 corresponding to the groove 115. The fastening screw 60 passes through the threaded hole 31 and abuts against the groove 115, thereby connecting the protective cap 30 to the valve body 10. The locking washer 70 is fitted onto the outer periphery of the third portion 11 and tightened with the third thread 114. Here, the groove 115 is equivalent to being located in the non-threaded area of ​​the valve body 10 for installing the protective cap 30. The groove 115 and the protective cap 30 are interference-fitted, which can meet the high protection level requirements, reaching IP67. This allows the pressure relief valve 100 to be installed not only at the bottom of the lithium battery box, but also on the side and top of the lithium battery box.

[0044] Specifically, the third thread 114 is fixedly connected to the lithium battery box body. By setting the locking washer 70, it can prevent the leakage of trace amounts of gas during normal operation of the lithium battery box, and at the same time isolate external dust, rainwater and other substances from entering the interior of the lithium battery box.

[0045] In some embodiments, the protective cap 30 has two or more symmetrical threaded holes 31 on its side. The size of the threaded holes 31 is set to different dimensions according to the diameter of the protective cap 30 and the ease of installation. They are tightened by fastening screws 60 and installed in the groove 115 of the valve body 10.

[0046] In some embodiments, the valve body 10 of the pressure relief valve 100 is made of a metal such as stainless steel or copper. The protective cap 30 is made of a metal such as stainless steel or copper.

[0047] In some embodiments, the sealing lip 40 is made of polytetrafluoroethylene (PTFE). PTFE has a low coefficient of friction. After the inclined section 41 of the sealing lip 40 makes interference contact with the second part 22 of the valve core 20, a sealed cavity is formed, which provides excellent protection against the external environment, preventing dust, rainwater, and other impurities from entering the pressure relief valve 100. The protection level can reach IP67. Furthermore, after the pressure relief valve 100 releases pressure, the inclined section 41 of the sealing lip 40 can automatically rebound and close the exhaust passage 112.

[0048] In this embodiment, high-pressure gas inside the non-coal mine lithium battery box enters from the inverted conical open end of the valve body 10, passes sequentially through the pressure relief hole of the valve body 10, the contact point between the second part 22 of the valve core 20 and the inclined section 41 of the sealing lip 40, and finally exits from the gap between the protective cap 30 and the valve body 10, achieving rapid pressure balance inside the non-coal mine lithium battery box. The pressure relief valve 100 in this embodiment can meet the rapid pressure relief requirements of large-capacity lithium battery boxes, and features dustproof, vibration-resistant, high protection level, and explosion-proof design. It also reduces maintenance frequency, ensures continuous equipment operation, and improves equipment operating efficiency.

[0049] Therefore, those skilled in the art should recognize that although many exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications conforming to the principles of the present invention can be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention should be understood and recognized as covering all such other variations or modifications.

Claims

1. A pressure relief valve, characterized in that, include: The valve body has a valve cavity and an axially arranged exhaust passage inside, and the valve body also has a mounting groove communicating with the exhaust passage. A valve core is installed inside the valve cavity and connected to the valve body; A sealing assembly is installed in the mounting groove. The sealing assembly includes at least one sealing lip and at least one locking plate. The sealing lip is sleeved on the outer periphery of the valve core. The sealing lip is elastic and has an inclined section that slopes in the direction of pressure relief. The inclined section is located in the exhaust passage. The locking plate is used to lock the sealing lip in the mounting groove. The inclined section of the sealing lip is configured to contact the valve core when the pressure in the valve cavity is less than the set opening pressure, thereby sealing the exhaust passage. When the pressure inside the valve chamber is greater than or equal to the set opening pressure, the valve separates from the valve core, thereby opening the exhaust passage for venting and depressurization.

2. The pressure relief valve according to claim 1, characterized in that, When the pressure inside the valve chamber is less than the set opening pressure, the angle between the sealing lip and the valve core is in the range of 30°-60°.

3. The pressure relief valve according to claim 2, characterized in that, The sealing lip also includes a fixing section, which is installed in the mounting groove and connected to the inclined section. The fixing section is in contact with the locking piece.

4. The pressure relief valve according to claim 3, characterized in that, The mounting groove has an opening and a bottom wall arranged opposite to the opening; The sealing assembly includes multiple sealing lips and multiple locking plates, which are arranged alternately, with one of the sealing lips abutting against the bottom wall of the mounting groove.

5. The pressure relief valve according to claim 4, characterized in that, The locking piece has an annular groove on its first end face near the corresponding sealing lip.

6. The pressure relief valve according to claim 5, characterized in that, The mounting groove also includes an annular sidewall arranged perpendicular to the bottom wall; The locking piece also includes an outer wall, which abuts against the annular sidewall of the mounting groove, and the connection between the outer wall of the locking piece and the first end face is provided with a tapered chamfer.

7. The pressure relief valve according to claim 6, characterized in that, The locking plate also includes an inner wall, which is spaced apart from the valve core, and the connection between the inner wall of the locking plate and the first end face is provided with a rounded chamfer.

8. The pressure relief valve according to claim 7, characterized in that, The valve core includes a first part and a second part. The outer periphery of the first part is provided with a first thread, and the interior of the valve body is provided with a second thread that mates with the first thread. The second part is arranged correspondingly to the inclined portion of the sealing lip.

9. The pressure relief valve according to claim 8, characterized in that, The valve body includes a third part and a fourth part, the third part having a third thread on its outer periphery, and the fourth part having a groove on its outer periphery; the pressure relief valve also includes: A protective cap is fitted over the outside of the fourth part and has a gap between it and the valve body. The protective cap has a threaded hole corresponding to the groove. A fastening screw passes through the threaded hole and abuts against the groove, thereby connecting the protective cap to the valve body; A locking washer is fitted onto the outer periphery of the third part and tightened with the third thread.

10. The pressure relief valve according to any one of claims 1-9, characterized in that, The exhaust passage includes a plurality of pressure relief holes arranged circumferentially along the valve body; The sealing lip is made of polytetrafluoroethylene.

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