An explosion-proof valve

Abstract

This utility model discloses an explosion-proof valve, which includes a valve body, a piston movably mounted on the valve body, and a spring installed between the piston and the valve body. The valve body is provided with a pressure relief hole and an installation groove located outside the pressure relief hole. A sealing ring is installed in the installation groove and partially protrudes outside the installation groove. The piston presses against the valve body under the elastic force of the spring and squeezes the sealing ring to seal the pressure relief hole. The inner wall of the installation groove is provided with an anti-detachment groove. The sealing ring is integrally formed with a protruding anti-detachment buckle. The anti-detachment buckle engages and positions with the anti-detachment groove to form an anti-detachment structure, ensuring that the sealing ring is more stably fixed in the installation groove. After the anti-detachment buckle engages and positions with the anti-detachment groove, it exerts a pulling force on the sealing ring, which can effectively prevent the sealing ring from detaching from the installation groove. This allows the explosion-proof valve of this utility model to be reused after pressure relief, making it more convenient to use and reducing costs.

Description

Technical fields:

[0001] This utility model relates to the technical field of explosion-proof valve products, and specifically to an explosion-proof valve. Background technology:

[0002] An explosion-proof valve is a safety device used to prevent equipment or systems from exploding or being damaged due to excessive internal pressure. It is widely used in products such as automotive power battery packs.

[0003] For example, Chinese utility model application No. 202121510014.X discloses an explosion-proof valve, which includes: a valve seat, a valve core, and a limiting member; the valve core is movably mounted on the valve seat, and the limiting member is connected to the valve core; the valve core includes: a disc body and a radial body, and a first sealing member is installed on the end face of the valve seat opposite to the disc body. In the closed position, the first sealing member is squeezed between the valve seat and the disc body, thereby ensuring that the explosion-proof valve is well sealed at this time.

[0004] However, the first sealing element is a simple O-ring, which is installed in the annular groove of the valve seat by embedding. Specifically, the first sealing element is embedded and fixed in the annular groove of the valve seat by being squeezed and deformed. It does not have an anti-detachment function, so after the disc body is opened relative to the valve seat to achieve pressure relief, the first sealing element is very easy to detach from the annular groove of the valve seat. As a result, after the pressure relief is completed and the spring drives the disc body to return to its original position, the disc body cannot be sealed and assembled with the valve seat again. The explosion-proof valve is then in a failed state and cannot be used again. A new explosion-proof valve needs to be replaced. This requires disassembling the failed explosion-proof valve and replacing it with a new one, which is extremely inconvenient and increases costs, causing great trouble to users.

[0005] In view of the above, the inventors propose the following technical solution. Utility Model Content:

[0006] The purpose of this invention is to overcome the shortcomings of the existing technology and provide an explosion-proof valve.

[0007] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: The explosion-proof valve includes a valve body, a piston movably mounted on the valve body, and a spring installed between the piston and the valve body. The valve body is provided with a pressure relief hole and an installation groove located outside the pressure relief hole. The sealing ring is installed in the installation groove and partially protrudes outside the installation groove. The piston presses on the valve body under the elastic force of the spring and squeezes the sealing ring to seal the pressure relief hole. The inner wall of the installation groove is provided with an anti-disengagement groove. The sealing ring is integrally formed with a protruding anti-disengagement buckle, which engages and is positioned with the anti-disengagement groove.

[0008] Furthermore, in the above technical solution, the anti-detachment groove also penetrates the inner wall of the pressure relief hole, and the upper end of the valve body is also provided with an inlet that penetrates the anti-detachment groove from top to bottom and guides the anti-detachment buckle to be pressed into the anti-detachment groove from top to bottom. The inlet also penetrates the installation groove, and the size of the inlet is smaller than the size of the anti-detachment groove.

[0009] Furthermore, in the above technical solution, the inner and / or outer sides of the sealing ring are provided with a plurality of vertically distributed venting grooves for preventing the sealing ring from bulging and deforming after assembly, and the venting grooves penetrate the upper and lower end faces of the sealing ring.

[0010] Furthermore, in the above technical solution, the valve body is integrally molded from plastic, and metal bushing inserts are fixed inside both sides of the valve body; the outer side of the valve body is also provided with several tooling slots for fixing airtightness testing fixtures.

[0011] Furthermore, in the above technical solution, the longitudinal section of the piston is T-shaped, including a piston body and a piston rod integrally formed at the lower end of the piston body. The piston body covers the upper end of the valve body and compresses the sealing ring to seal the pressure relief hole. The piston rod extends out of the lower end of the valve body through the movable hole in the center of the valve body. The spring is sleeved on the piston rod, with the upper end of the spring in contact with the valve body and the lower end of the spring in contact with the bottom plug provided at the lower end of the piston rod.

[0012] Furthermore, in the above technical solution, the piston is integrally molded from plastic and adopts an umbrella-shaped structure. The upper end face of the piston body is integrally molded with multiple first reinforcing ribs that are evenly distributed radially, and the lower end face of the piston body is integrally molded with multiple second reinforcing ribs that are evenly distributed radially. The piston rod is integrally molded with several third reinforcing ribs that are vertically distributed at intervals. An installation section is formed between the lower end of the third reinforcing rib and the lower end face of the piston rod. The bottom plug is fitted into the installation section, and the end of the installation section is connected to and defined by a flange formed by hot-melt riveting.

[0013] Furthermore, in the above technical solution, the piston is provided with a breathable channel that runs through its upper and lower end faces, and a waterproof and breathable membrane is fixed to the upper end face of the piston, which covers the upper end of the breathable channel.

[0014] Furthermore, in the above technical solution, a protective cover is also provided on the upper end of the piston. The protective cover covers the waterproof and breathable membrane and forms a gap between it and the waterproof and breathable membrane. A bent air passage is formed between the protective cover and the piston.

[0015] Furthermore, in the above technical solution, the upper end face of the piston is provided with an installation groove and multiple installation ribs located outside the installation groove and spaced apart, and a groove located outside the installation ribs. The installation ribs are provided with positioning grooves. The waterproof and breathable membrane is fixed in the installation groove. The protective cover is fixed to the piston by being embedded in the positioning groove through a positioning post formed at its lower end. Multiple spaced first pads on the lower end face of the protective cover contact the installation ribs, forming a connecting groove and groove between the lower end face of the protective cover and the installation ribs. The first horizontal gap is formed by the outer edge of the protective cover, which is also formed with a downward protruding flange. The flange is embedded in the groove, and the lower end face of the flange is lower than the lower end face of the mounting rib, so that a first vertical gap is formed between the inner side of the flange and the outer side of the mounting rib. A second horizontal gap is formed between the lower end face of the flange and the bottom surface of the groove. A second vertical gap is formed between the outer side of the flange and the inner wall of the groove, which communicates with the outside. The first horizontal gap, the first vertical gap, the second horizontal gap, and the second vertical gap are connected in sequence to form the air permeable channel.

[0016] Furthermore, in the above technical solution, the lower end of the valve body is formed with multiple elastic buckle arms, and the valve body is fixed with a protective shell by the elastic buckle arms. The protective shell also covers the piston rod and the spring, and an air-permeable gap is formed between the protective shell and the valve body.

[0017] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art: In addition to the sealing ring being embedded and fixed in the installation groove, which itself forms a holding force, the present invention also provides an anti-detachment groove on the inner wall of the installation groove. The sealing ring is integrally formed with a protruding anti-detachment buckle, which engages and positions with the anti-detachment groove to form an anti-detachment structure, ensuring that the sealing ring is more stably fixed in the installation groove. Furthermore, after the anti-detachment buckle engages and positions with the anti-detachment groove, it exerts a pulling force on the sealing ring, effectively preventing the sealing ring from detaching from the installation groove. This allows the explosion-proof valve of the present invention to be reused after pressure relief, making it more convenient to use and reducing costs, thus avoiding the increase in costs associated with replacing with a new explosion-proof valve, resulting in strong market competitiveness. Attached image description:

[0018] Figure 1 This is a perspective view of the present invention;

[0019] Figure 2 This is a perspective view of the present invention from another angle;

[0020] Figure 3 This is a perspective view of the sealing ring in this utility model;

[0021] Figure 4 This is an exploded perspective view of the present invention;

[0022] Figure 5 This is a cross-sectional view of the present invention;

[0023] Figure 6 This is a cross-sectional view from another perspective of this utility model;

[0024] Figure 7 This is a structural diagram of the present invention;

[0025] Figure 8 This is a perspective view of the valve body in this utility model;

[0026] Figure 9 This is a perspective view of the protective cover in this utility model;

[0027] Figure 10 This is a perspective view of the piston in this utility model;

[0028] Figure 11 This is a perspective view of the piston in this utility model from another angle. Detailed implementation method:

[0029] The present invention will be further described below with reference to specific embodiments and accompanying drawings.

[0030] See Figure 1-11 The image shows an explosion-proof valve that can be used in products such as automotive power battery packs.

[0031] This utility model explosion-proof valve includes a valve body 1, a piston 2, a spring 3, and a sealing ring 4. The valve body 1 is provided with a pressure relief hole 11 and an installation groove 12 located outside the pressure relief hole 11. The piston 2 is movably installed on the valve body 1, and can slide up and down relative to the valve body 1. The spring 3 is installed between the piston 2 and the valve body 1, and provides elastic force to the piston 2, thereby ensuring that the piston 2 can stably press on the valve body 1 and cover the pressure relief hole 11. The sealing ring 4 is installed in the installation groove 12 and partially protrudes outside the installation groove 12. Under the elastic force of the spring 3, the piston 2 presses on the valve body 1 and squeezes the sealing ring 4 to seal the pressure relief hole 11. This is the normal state. When the pressure is too large and acts on the piston 2 through the pressure relief hole 11, when the pressure is greater than the elastic force of the spring, it can push the piston 2 to move outward (i.e. upward) relative to the valve body 1, so that the piston 2 and the valve body 1 are separated, thereby realizing pressure relief. After the pressure is released, when no pressure is applied to the piston 2 through the pressure relief hole 11, or when the pressure is less than the spring force, the spring force drives the piston 2 to move downward relative to the valve body 1 to close. At this time, the piston 2 presses back onto the valve body 1 and squeezes the sealing ring 4 to seal the pressure relief hole 11. The above describes the working principle of a conventional explosion-proof valve.

[0032] To prevent the sealing ring 4 from detaching from the mounting groove 12 on the valve body 1, and to allow the explosion-proof valve of this invention to be reused after pressure relief, the following design is made: In addition to the sealing ring 4 being embedded and fixed in the mounting groove 12, forming its own holding force, an anti-detachment groove 121 is also provided on the inner wall of the mounting groove 12. The sealing ring 4 has an integrally formed protruding anti-detachment buckle 41, which engages and positions with the anti-detachment groove 121 to form an anti-detachment structure. This ensures that the sealing ring 4 is more stably fixed in the mounting groove 12. Furthermore, after the anti-detachment buckle 41 engages and positions with the anti-detachment groove 121, it exerts a pulling force on the sealing ring 4, effectively preventing the sealing ring 4 from detaching from the mounting groove 12. This allows the explosion-proof valve of this invention to be reused after pressure relief, making it more convenient to use and reducing costs, thus avoiding the increased cost of replacing with a new explosion-proof valve, resulting in strong market competitiveness.

[0033] The assembly structure of the anti-detachment buckle 41 and the anti-detachment groove 121 will be described in detail below.

[0034] The anti-detachment groove 121 also penetrates the inner wall of the pressure relief hole 11, and the upper end of the valve body 1 is also provided with an inlet 120 that penetrates the anti-detachment groove 121 from top to bottom and guides the anti-detachment buckle 41 to be pressed into the anti-detachment groove 121 from top to bottom. The inlet 120 also penetrates the installation groove 12, and the size of the inlet 120 is smaller than the size of the anti-detachment groove 121. That is to say, when the sealing ring 4 is installed into the installation groove 12, the anti-detachment buckle 41 enters the inlet 120, and after the sealing ring 4 is installed in place relative to the installation groove 12, the anti-detachment buckle 41 completely passes through the inlet 120 and enters the anti-detachment groove 121. The size of the inlet 120 is smaller than the size of the anti-detachment groove 121, so that the anti-detachment buckle 41 and the anti-detachment groove 121 form a stable snap-fit ​​installation, forming an anti-detachment structure. The whole process is more convenient and simpler.

[0035] Furthermore, the sealing ring 4 has several vertically distributed venting grooves 42 on its inner and / or outer sides to prevent it from bulging and deforming after assembly. These venting grooves 42 penetrate the upper and lower end faces of the sealing ring 4. During the installation of the sealing ring 4 into the mounting groove 12, the sealing ring 4 will be compressed and deformed. After the sealing ring 4 is installed in place relative to the mounting groove 12, it is fastened to the mounting groove 12 by an interference fit. Due to the design of the venting grooves 42, it can prevent the sealing ring from bulging and deforming after assembly relative to the mounting groove 12. At the same time, the venting grooves 42 also serve to vent air, making it easier and smoother for the sealing ring 4 to be installed in the mounting groove 12, thus improving operational convenience.

[0036] In this embodiment, the valve body 1 is integrally molded from plastic, which is simple to manufacture and has low manufacturing cost. Metal bushing inserts 13 are fixed inside both sides of the valve body 1. These metal bushing inserts 13 have through holes. When the valve body 1 is installed on an installation interface such as a battery pack sealing box, the through holes of the metal bushing inserts 13 correspond to the screw holes of the installation interface. Screws pass through the through holes of the metal bushing inserts 13 and the screw holes of the installation interface for screw fixing, ensuring stable installation of the present invention on the battery pack sealing box or other installation interface. The pre-embedded metal bushing inserts 13 within the valve body 1 increases structural strength and prevents damage. To improve sealing, a sealing gasket 17 is also provided at the lower end of the valve body 1. The sealing gasket 17 contacts the installation interface, ensuring assembly sealing. The inner and outer walls of the sealing gasket 17 are formed with protrusions 171, which contact the inner and outer walls of the annular groove at the lower end of the valve body 1, improving the stability of the assembly structure.

[0037] After the invention is manufactured, it needs to be tested for air tightness. At this time, since the outer side of the valve body 1 is also provided with several tooling slots 14 for fixing the air tightness testing tooling, and the tooling slots 14 are used to fix and install the air tightness testing tooling, the assembly is more convenient and the structure is more stable.

[0038] The piston 2 has a T-shaped longitudinal section and includes a piston body 21 and a piston rod 22 integrally formed at the lower end of the piston body 21. The piston body 21 covers the upper end of the valve body 1 and compresses the sealing ring 4 to seal the pressure relief hole 11. The piston rod 22 extends out of the lower end of the valve body 1 through the movable hole 15 in the center of the valve body 1. The spring 3 is sleeved on the piston rod 22. The upper end of the spring 3 contacts the valve body 1, and the lower end of the spring 3 contacts the bottom plug 23 provided at the lower end of the piston rod 22, which can ensure that the spring 3 is stably installed between the piston 2 and the valve body 1.

[0039] The piston 2 is integrally molded from plastic, resulting in a simpler structure and lower manufacturing cost. The piston 2 adopts an umbrella-shaped structure, with multiple radially evenly distributed first reinforcing ribs integrally formed on the upper surface of the piston body 21, and multiple radially evenly distributed second reinforcing ribs 212 integrally formed on the lower surface of the piston body 21. These first and second reinforcing ribs 212 enhance the structural strength of the entire piston body 21, preventing accidental breakage and providing advantages such as more balanced stress distribution, high strength, and minimal deformation under stress. The piston rod 22 has several vertically distributed third reinforcing ribs 221 integrally formed on its exterior, further increasing structural strength. An installation section 222 is formed between the lower end of each third reinforcing rib 221 and the lower surface of the piston rod 22. The bottom plug 23 is fitted into this installation section 222, and the end of the installation section 222 is connected to and constrained by a flange 223 formed by hot-melt riveting, making its manufacturing process simpler and less costly.

[0040] The piston 2 is provided with a breathable channel 201 that runs through its upper and lower end faces. A waterproof and breathable membrane 5 is also fixed to the upper end face of the piston 2. The waterproof and breathable membrane 5 covers the upper end of the breathable channel 201, so that the present invention also has waterproof and breathable functions.

[0041] The piston 2 is also equipped with a protective cover 6 at its upper end. This protective cover 6 covers the waterproof and breathable membrane 5, effectively preventing foreign objects from contacting and damaging the waterproof and breathable membrane 5, thus providing good protection. Specifically, it effectively prevents dust accumulation and effectively prevents dust and gravel from impacting the waterproof and breathable membrane. Furthermore, a gap is formed between the protective cover 6 and the waterproof and breathable membrane 5, and a bent airflow channel is formed between the protective cover 6 and the piston 2. The waterproof and breathable function is achieved through the airflow channel, the waterproof and breathable membrane 5, and the airflow channel 201. This airflow channel must bend at least 90 degrees to reach the waterproof and breathable membrane, reducing the possibility of gravel impacting the membrane.

[0042] Specifically, the upper end face of the piston 2 is provided with a mounting groove 202 and multiple mounting ribs 203 located outside the mounting groove 202 and spaced apart, and a groove 204 located outside the mounting ribs 203. The mounting ribs 203 are provided with positioning grooves 205. The waterproof and breathable membrane 5 is fixed in the mounting groove 202. The protective cover 6 is fixed to the piston 2 by being embedded in the positioning groove 205 through a positioning post 61 formed at its lower end. Multiple spaced first pads 62 on the lower end face of the protective cover 6 contact the mounting ribs 203, so that a first horizontal gap is formed between the lower end face of the protective cover 6 and the mounting ribs 203, connecting the mounting groove 202 and the groove 204. 601, the outer edge of the protective cover 6 is also formed with a downwardly protruding flange 63, which is embedded in the groove 204, and the lower end face of the flange 63 is lower than the lower end face of the mounting rib 203, so that a first vertical gap 602 is formed between the inner side of the flange 63 and the outer side of the mounting rib 203, and a second horizontal gap 603 is formed between the lower end face of the flange 63 and the bottom surface of the groove 204. The outer side of the flange 63 and the inner wall of the groove 204 form a second vertical gap 604 that communicates with the outside. The first horizontal gap 601, the first vertical gap 602, the second horizontal gap 603, and the second vertical gap 604 are connected in sequence to form the air permeable channel.

[0043] In addition, the protective cover 6 and the piston 2 are fixed by hot melt welding / hot riveting, or by mature processes such as ultrasonic welding or adhesive bonding.

[0044] The lower end of the valve body 1 is formed with multiple elastic buckle arms 16. A protective shell 7 is secured to the valve body 1 via these elastic buckle arms 16. The protective shell 7 also covers the piston rod 22 and spring 3, protecting them and effectively preventing foreign objects from entering the spring 3, thus ensuring its normal operation. Furthermore, a ventilated gap is formed between the protective shell 7 and the valve body 1, connecting to the ventilated channel 201, facilitating the waterproof and ventilated function of this invention. The upper end of the protective shell 7 is provided with multiple locking holes 71 corresponding to the elastic buckle arms 16. The elastic buckle arms 16 are secured with these locking holes 71, ensuring the protective shell 7 is stably installed at the lower end of the valve body 1. This assembly structure is simple and easy to install.

[0045] In summary, this utility model, with the sealing ring 4 embedded and fixed in the mounting groove 12, forming its own holding force, also provides an anti-detachment groove 121 on the inner wall of the mounting groove 12. The sealing ring 4 is integrally formed with a protruding anti-detachment buckle 41, which engages and positions with the anti-detachment groove 121 to form an anti-detachment structure, ensuring that the sealing ring 4 is more stably fixed in the mounting groove 12. After the anti-detachment buckle 41 engages and positions with the anti-detachment groove 121, it exerts a pulling force on the sealing ring 4, which can effectively prevent the sealing ring 4 from detaching from the mounting groove 12. This allows the explosion-proof valve of this utility model to be reused after pressure relief, making it more convenient to use and reducing costs, i.e., avoiding the increase in costs by replacing with a new explosion-proof valve, thus giving it a strong market competitiveness.

[0046] Of course, the above description is only a specific embodiment of the present utility model and is not intended to limit the scope of the present utility model. All equivalent changes or modifications made to the structure, features and principles described in the claims of the present utility model should be included in the scope of the claims of the present utility model.

Claims

1. An explosion-proof valve, comprising a valve body (1), a piston (2) movably mounted on the valve body (1), and a spring (3) mounted between the piston (2) and the valve body (1), wherein the valve body (1) is provided with a pressure relief hole (11) and an installation groove (12) located outside the pressure relief hole (11), and a sealing ring (4) is installed in the installation groove (12) and partially protrudes outside the installation groove (12); the piston (2) presses against the valve body (1) under the elastic force of the spring (3) and squeezes the sealing ring (4) to seal the pressure relief hole (11), characterized in that: The inner wall of the installation groove (12) is provided with an anti-detachment groove (121), and the sealing ring (4) is integrally formed with a protruding anti-detachment buckle (41), which engages and is positioned with the anti-detachment groove (121).

2. The explosion-proof valve according to claim 1, characterized in that: The anti-detachment groove (121) also penetrates the inner wall of the pressure relief hole (11), and the upper end of the valve body (1) is also provided with an inlet (120) that penetrates the anti-detachment groove (121) from top to bottom and guides the anti-detachment buckle (41) to be pressed into the anti-detachment groove (121) from top to bottom. The inlet (120) also penetrates the installation groove (12), and the size of the inlet (120) is smaller than the size of the anti-detachment groove (121).

3. The explosion-proof valve according to claim 2, characterized in that: The sealing ring (4) has several vertically distributed vent grooves (42) on its inner and / or outer sides to prevent the sealing ring from bulging and deforming after assembly. The vent grooves (42) penetrate the upper and lower end faces of the sealing ring (4).

4. The explosion-proof valve according to claim 1, characterized in that: The valve body (1) is integrally molded from plastic, and metal bushing inserts (13) are fixed inside both sides of the valve body (1); the outer side of the valve body (1) is also provided with a number of tooling slots (14) for fixing airtightness testing tooling.

5. An explosion-proof valve according to any one of claims 1-4, characterized in that: The piston (2) has a T-shaped longitudinal section and includes a piston body (21) and a piston rod (22) integrally formed at the lower end of the piston body (21). The piston body (21) covers the upper end of the valve body (1) and squeezes the sealing ring (4) to seal the pressure relief hole (11). The piston rod (22) passes through the movable hole (15) in the center of the valve body (1) and extends out of the lower end of the valve body (1). The spring (3) is sleeved on the piston rod (22). The upper end of the spring (3) contacts the valve body (1), and the lower end of the spring (3) contacts the bottom plug (23) provided at the lower end of the piston rod (22).

6. The explosion-proof valve according to claim 5, characterized in that: The piston (2) is integrally molded from plastic and has an umbrella-shaped structure. The upper end face of the piston body (21) is integrally molded with multiple first reinforcing ribs that are evenly distributed radially, and the lower end face of the piston body (21) is integrally molded with multiple second reinforcing ribs (212) that are evenly distributed radially. The piston rod (22) is integrally molded with several third reinforcing ribs (221) that are vertically distributed at intervals. An installation section (222) is formed between the lower end of the third reinforcing rib (221) and the lower end face of the piston rod (22). The bottom plug (23) is fitted into the installation section (222), and the flange (223) formed by hot-melt riveting at the end of the installation section (222) contacts and defines the bottom of the bottom plug (23).

7. The explosion-proof valve according to claim 5, characterized in that: The piston (2) is provided with a breathable channel (201) that runs through its upper and lower end faces. A waterproof and breathable membrane (5) is also fixed on the upper end face of the piston (2), and the waterproof and breathable membrane (5) covers the upper end of the breathable channel (201).

8. The explosion-proof valve according to claim 7, characterized in that: The piston (2) is also provided with a protective cover (6) at its upper end. The protective cover (6) covers the waterproof and breathable membrane (5) and forms a gap between it and the waterproof and breathable membrane (5). A bent air passage is formed between the protective cover (6) and the piston (2).

9. An explosion-proof valve according to claim 8, characterized in that: The piston (2) has an installation groove (202) on its upper end face, as well as multiple installation ribs (203) located outside the installation groove (202) and spaced apart, and a groove (204) located outside the installation ribs (203). The installation ribs (203) are provided with positioning grooves (205). The waterproof and breathable membrane (5) is fixed in the installation groove (202). The protective cover (6) is fixed to the piston (2) by being embedded in the positioning groove (205) through the positioning post (61) formed at its lower end. Multiple spaced first pads (62) on the lower end face of the protective cover (6) contact the installation ribs (203), so that a first horizontal gap (6) is formed between the lower end face of the protective cover (6) and the installation ribs (203) connecting the installation groove (202) and the groove (204). 01), the outer edge of the protective cover (6) is also formed with a downward protruding flange (63), the flange (63) is embedded in the groove (204), and the lower end face of the flange (63) is lower than the lower end face of the mounting rib (203), so that a first vertical gap (602) is formed between the inner side of the flange (63) and the outer side of the mounting rib (203), a second horizontal gap (603) is formed between the lower end face of the flange (63) and the bottom surface of the groove (204), and a second vertical gap (604) is formed between the outer side of the flange (63) and the inner wall of the groove (204) to communicate with the outside. The first horizontal gap (601), the first vertical gap (602), the second horizontal gap (603), and the second vertical gap (604) are connected in sequence to form the air permeable channel.

10. An explosion-proof valve according to any one of claims 1-4, characterized in that: The lower end of the valve body (1) is formed with multiple elastic buckle arms (16). The valve body (1) is fixed with a protective shell (7) by the elastic buckle arms (16). The protective shell (7) also covers the piston rod (22) and the spring (3), and a breathable gap is formed between the protective shell (7) and the valve body (1).

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