Fire and explosion damper valve

Abstract

The utility model discloses a fire -arresting explosion -proof valve, this fire -arresting explosion -proof valve includes the valve body with pressure relief hole and the piston and the spring of installing between the guide rod and the valve body through the guide rod swing installation on the valve body, the piston is closed to the valve body under the spring elasticity effect to block the pressure relief hole, the valve body lower extreme is provided with at least two pieces interval distribution and is used for the fire -arresting net of the fire and the spark of the fire of the thermal runaway when spouting, and the fire -arresting net is located below the pressure relief hole, each piece fire -arresting net all has a plurality of interval distribution's exhaust hole, and the exhaust hole of two adjacent fire -arresting nets is staggered arrangement, and under the orthographic projection, no overlap. The utility model can carry out at least two times blocking to the open fire of battery pack pressure relief process accompanying the discharge, make the utility model reach the effect that can prevent explosion pressure relief and can block the open fire, and it is more safe and reliable to use.

Description

Technical fields:

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

[0002] Existing pressure relief valves or explosion-proof valves for chemical energy storage batteries and automotive power battery packs use ordinary explosion-proof pressure relief valves for pressure relief and explosion prevention, which do not have flame-retardant functions. When the battery pack experiences thermal runaway and the pressure exceeds the threshold, the explosion-proof pressure relief valve opens to release pressure, and flames can burst out from the pressure relief valve or explosion-proof valve, quickly igniting surrounding batteries or flammable materials. The flames can spread rapidly and potentially cause greater safety hazards; for example, a breathing explosion-proof valve for battery packs (202510533295.7). Explosion-proof valves such as explosion-proof valves, batteries and electrical devices (202520138072.6), explosion-proof valves, battery packs and vehicles (202411561967.7), explosion-proof valves, batteries and electrical devices (202422488200.8), a multi-functional spring-type ventilated explosion-proof valve device (202421691056.1), and a waterproof, dustproof, ventilated explosion-proof valve (202421503097.3) all have the above-mentioned problems.

[0003] With the increasing national requirements for safety and environmental protection, it is necessary to invent and improve the flame-retardant and functional structure of explosion-proof pressure relief valves to prevent the exhaust of flames and improve safety in use. Therefore, the inventor proposes the following technical solution. Utility Model Content:

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a flame-arresting and explosion-proof valve.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: The flame arrestor and explosion-proof valve includes a valve body with a pressure relief hole, a piston movably mounted on the valve body via a guide rod, and a spring installed between the guide rod and the valve body. The piston closes relative to the valve body under the elastic force of the spring to block the pressure relief hole. At least two flame arrestor nets are provided at the lower end of the valve body, which are spaced apart and used to block flames and sparks emitted during thermal runaway. The flame arrestor nets are located below the pressure relief hole. Each flame arrestor net has multiple spaced vent holes, and the vent holes of adjacent flame arrestor nets are staggered and do not overlap under orthographic projection.

[0006] Furthermore, in the above technical solution, a bracket is provided in the middle of the valve body. The bracket has a central hole for the guide rod to pass through and a pressure relief hole located around the central hole. The piston abuts against the bracket and is sealed and assembled by a first sealing ring.

[0007] Furthermore, in the above technical solution, the number of fire-resistant meshes is three pieces, wherein the number and relative position of the exhaust holes in the two fire-resistant meshes located at the top and bottom are the same, and the number and relative position of the exhaust holes in the middle fire-resistant mesh are the same as those in the two fire-resistant meshes located at the top and bottom.

[0008] Furthermore, in the above technical solution, the number of exhaust holes is four groups, and each group of exhaust holes includes at least two spaced waist-shaped holes.

[0009] Furthermore, in the above technical solution, the number of exhaust holes is two sets, and each set of exhaust holes includes multiple circular holes or rhomboid holes distributed along an arc.

[0010] Furthermore, in the above technical solution, a first stepped groove is provided at the lower opening of the valve body, and a second stepped groove and a third stepped groove are also provided inside the lower end of the valve body; the number of flame arresters is three pieces, namely, a first flame arrester, a second flame arrester, and a third flame arrester, which are sequentially embedded and fixed in the first stepped groove, the second stepped groove, and the third stepped groove. The first flame arrester is also fitted to the lower end face of the bracket and covers the pressure relief hole. The second and third flame arresters are respectively provided with a first clearance hole and a second clearance hole at their centers. The second flame arrester is sleeved on the outside of the spring through the second clearance hole without contact; the third flame arrester is sleeved on the outside of the spring through the second clearance hole and is in contact and fastened.

[0011] Furthermore, in the above technical solution, the piston is provided with a stepped groove, and the piston has a first vent hole that extends downward through the bottom of the stepped groove. The upper end of the guide rod is fixedly connected to the lower end of the piston, and the guide rod is provided with a second vent hole that extends through the upper and lower ends and connects to the first vent hole. A waterproof and breathable membrane is fixed in the stepped groove by hot pressing, ultrasonic welding, or by pressing with a pressure ring. The waterproof and breathable membrane covers the first vent hole, and several exhaust grooves are opened inward from the outer periphery of the upper end of the piston. A cover plate is fixedly covered on the upper end of the piston, and the cover plate covers the exhaust grooves and the stepped groove. A non-perforated area is formed in the middle of the lowest fire-resistant mesh, and the non-perforated area is located below the second vent hole in the guide rod.

[0012] Furthermore, in the above technical solution, the cover plate is a magnetic suction plate; or, a magnetic suction sheet is also fixed on the inner side of the cover plate.

[0013] Furthermore, in the above technical solution, the upper end of the guide rod is also provided with several exhaust holes that pass through the second vent hole. When the piston opens outward relative to the valve body to release pressure, the exhaust hole connects the pressure relief channel between the piston and the valve body.

[0014] Furthermore, in the above technical solution, the outer edge of the fire-resistant mesh is also fixed to the inner wall of the valve body by welding or waterproof adhesive.

[0015] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art: The present invention provides at least two spaced flame arrestor meshes at the lower end of the valve body, and the exhaust holes of adjacent flame arrestor meshes are staggered and do not overlap under orthographic projection, thus forming a detour / bent pressure relief path. When the internal pressure of the battery pack is too high and pushes open the piston, forming a pressure relief channel between the piston and the valve body, the internal pressure of the battery pack is relieved through the above-mentioned pressure relief path and pressure relief channel, achieving the function of pressure relief and explosion prevention; even if the battery pack pressure relief process is accompanied by open flame discharge, when the open flame passes through the detour / bent pressure relief path... The first flame is blocked by the first flame arrestor mesh, and even after passing through the vent of the first flame arrestor mesh, it is blocked again by the second flame arrestor mesh. This disperses the flame impact force and blocks the burning flames or sparks, preventing them from escaping from the battery pack. The gas is bent after being blocked by the second flame arrestor mesh and then discharged through the vent of the second flame arrestor mesh. In other words, this invention can block the open flame that is discharged during the battery pack depressurization process at least twice, so that this invention can both prevent explosion and depressurize and block open flames, making it safer and more reliable to use. Attached image description:

[0016] Figure 1 This is a perspective view of the present invention;

[0017] Figure 2 This is a perspective view of the present invention from another angle;

[0018] Figure 3 This is an exploded view of this utility model;

[0019] Figure 4 This is a cross-sectional view of the present invention;

[0020] Figure 5 This is a perspective view of the valve body in this utility model;

[0021] Figure 6 This is a perspective view of the valve body from another angle in this utility model;

[0022] Figure 7 This is a perspective view of another structure of this utility model;

[0023] Figure 8 This is a cross-sectional view of another structure of this utility model;

[0024] Figure 9 This is an exploded perspective view of the fire-resistant mesh in another structure of this utility model. Detailed implementation method:

[0025] The present invention will be further described below with reference to specific embodiments and accompanying drawings.

[0026] See Figure 1-9 The image shows a flame arrestor and explosion-proof valve that can be applied to a battery pack, and the example shown is an installation in a battery pack.

[0027] This utility model of a flame-arresting and explosion-proof valve includes a valve body 1 with a pressure relief hole 101, a piston 3 movably mounted on the valve body 1 via a guide rod 2, and a spring 4 installed between the guide rod 2 and the valve body 1. The piston 3 closes relative to the valve body 1 under the elastic force of the spring 4 to seal the pressure relief hole 101. In practical use, it can be directly installed on a battery pack. Initially, the piston 3 closes relative to the valve body 1 under the elastic force of the spring 4 to seal the pressure relief hole 101, i.e., the pressure relief hole 101 is closed. When thermal runaway occurs in the battery pack, the internal pressure of the battery pack becomes excessive, pressing against the piston 3. At this time, the pressure exceeds the spring force, overcoming the spring force and compressing the spring. The piston 3 slides outward relative to the valve body 1 via the guide rod 2. At this time, a pressure relief channel is formed between the piston 3 and the valve body 1, and the internal pressure of the battery pack is relieved through this channel, thereby preventing the battery pack from exploding and achieving the function of pressure relief and explosion prevention.

[0028] However, when thermal runaway occurs in the battery pack, it is usually accompanied by open flames. To solve this technical problem, this embodiment makes the following design: The lower end of the valve body 1 is provided with at least two spaced flame arrestor nets 5 for blocking the flames and sparks emitted during thermal runaway. The flame arrestor nets 5 are located below the pressure relief hole 101. Each flame arrestor net 5 has multiple spaced vent holes 50, and the vent holes 50 of two adjacent flame arrestor nets 5 are staggered and do not overlap under orthographic projection. In other words, this invention provides at least two spaced flame arrestor meshes 5 at the lower end of the valve body 1, with the exhaust holes 50 of adjacent flame arrestor meshes 5 staggered and not overlapping under orthographic projection, thus forming a detour / bend pressure relief path. When the internal pressure of the battery pack is too high and pushes open the piston 3, forming a pressure relief channel between the piston 3 and the valve body 1, the internal pressure of the battery pack is relieved through the aforementioned pressure relief path and channel, achieving the function of pressure relief and explosion prevention. Even if the battery pack pressure relief process is accompanied by the discharge of open flame, when the open flame passes through the detour / bend pressure relief path, that is, the open flame will be blocked by the first flame arrestor mesh. The first flame arrestor mesh 5 provides initial obstruction, and even after passing through the vent of the first flame arrestor mesh 5, it will be obstructed a second time by the second flame arrestor mesh 5. This disperses the flame impact force and blocks burning flames or sparks, preventing them from escaping the battery pack. The gas is bent after being blocked by the second flame arrestor mesh 5 and then discharged through the vent of the second flame arrestor mesh 5. In other words, this invention can block the open flame that is discharged during the battery pack depressurization process at least twice, achieving both explosion-proof depressurization and flame blocking functions, making it safer and more reliable to use.

[0029] A bracket 11 is provided in the middle of the valve body 1. The bracket 11 has a central hole 102 through which the guide rod 2 passes and a pressure relief hole 101 located around the central hole 102. The piston 3 abuts against the bracket 11 and is sealed by the first sealing ring 12.

[0030] The fire-resistant mesh 5 consists of three pieces. The two upper and lower fire-resistant meshes 5 have the same number and relative position of vent holes 50, while the middle fire-resistant mesh 5 has the same number and relative position of vent holes 50 as the upper and lower fire-resistant meshes 5. This invention can block the open flame emitted during the battery pack depressurization process three times, resulting in a better fire-resistant effect.

[0031] Among them, combined Figure 2-3 As shown, the number of exhaust holes 50 is four groups, and each group of exhaust holes 50 includes at least two spaced waist-shaped holes.

[0032] Or, combined Figure 7-9 As shown, the number of exhaust holes 50 is two sets, and each set of exhaust holes 50 includes multiple circular holes or rhomboid holes distributed along an arc.

[0033] The fire-resistant mesh 5 is made of high-temperature resistant materials, such as metal sheets, especially stainless steel sheets.

[0034] The lower opening of the valve body 1 is provided with a first stepped groove 103, and the lower interior of the valve body 1 is also provided with a second stepped groove 104 and a third stepped groove 105. The number of flame arrestor meshes 5 is three pieces, namely a first flame arrestor mesh 51, a second flame arrestor mesh 52, and a third flame arrestor mesh 53, which are sequentially embedded and fixed in the first stepped groove 103, the second stepped groove 104, and the third stepped groove 105. The first flame arrestor mesh 51 is also fitted to the lower end face of the bracket 11 and covers the pressure relief hole 101. The second flame arrestor mesh 52 and the third flame arrestor mesh 53 are respectively provided with a first clearance hole 521 and a second clearance hole 531 at their centers. The second flame arrestor mesh 52 is sleeved around the spring 4 through the first clearance hole 521 without contact, so as not to affect the normal compression of the spring 4. The third flame arrestor mesh 53 is sleeved around the spring 4 through the second clearance hole 531 and is in contact and fastened, thereby improving the installation stability of the third flame arrestor mesh 53.

[0035] The piston 3 is provided with a stepped groove 31, and a first vent hole 32 extends downward through the bottom of the stepped groove 31. The upper end of the guide rod 2 is fixedly connected to the lower end of the piston 3, and the guide rod 2 is provided with a second vent hole 21 that extends through the upper and lower ends and connects to the first vent hole 32. A waterproof and breathable membrane 7 is fixed in the stepped groove 31 by hot pressing, ultrasonic welding, or by pressing with a pressure ring 6. The waterproof and breathable membrane 7 covers the first vent hole 32, and several exhaust grooves 33 are opened inward from the outer periphery of the upper end of the piston 3. The piston 3 is fixedly covered with a cover plate 8, which covers the exhaust groove 33 and the stepped groove 31. A non-porous area 511 is formed in the middle of the lowest flame-arresting mesh 5. This non-porous area 511 is located below the second vent hole 21 in the guide rod 2, thus preventing the open flame emitted during the battery pack depressurization process from directly impacting the second vent hole 21 in the guide rod 2, avoiding the phenomenon of the open flame directly impacting the second vent hole 21 in the guide rod 2 and burning the waterproof and breathable membrane through the second vent hole 21. This utility model can achieve a waterproof and breathable effect. Specifically, when the internal pressure of the battery pack is increased but not enough to compress the spring, it can be discharged to the outside through the exhaust holes 50 of the three flame-arresting meshes 5, the second vent hole 21 in the guide rod 2, and the first vent hole 32 of the piston 3, and after passing through the waterproof and breathable membrane 7, through the exhaust groove 33, thereby achieving the purpose of balancing the internal and external air pressure. Conversely, when the internal pressure of the battery pack is low and the external pressure is high, the external pressure passes through the exhaust groove 33 and the waterproof and breathable membrane 7, and then through the first vent hole 32 of the piston 3, the second vent hole 21 in the guide rod 2, and the exhaust hole 50 of the three flame arrestor nets 5 to exchange with the inside of the battery pack, thereby achieving the purpose of balancing the internal and external air pressure.

[0036] To achieve airtightness testing, i.e., by using a magnet to attract the cover plate 8 to drive the entire piston 3 relative to the valve body 1, thereby performing airtightness testing on the explosion-proof valve, this utility model makes the following design: the cover plate 8 is a magnetic plate, which can be directly attracted and fixed to the magnet, and its structure is simpler and the cost is lower; or, a magnetic sheet 81 is also fixed inside the cover plate 8, and the magnet can be attracted and fixed to the magnetic sheet 81 through the cover plate 8.

[0037] The upper end of the guide rod 2 is also provided with several exhaust holes 22 that pass through the second vent hole 21. When the piston 3 opens outward relative to the valve body 1 to release pressure, the exhaust hole 22 connects the pressure relief channel between the piston 3 and the valve body 1, serving as the end of the auxiliary pressure relief, so as to further improve the explosion-proof pressure relief effect and improve the pressure relief efficiency.

[0038] The outer edge of the flame arrestor mesh 5 is also fixed to the inner wall of the valve body 1 by welding or waterproof glue to ensure the stability of the assembly structure.

[0039] In summary, this invention features at least two spaced flame arrestor meshes 5 at the lower end of the valve body 1, with the exhaust holes 50 of adjacent flame arrestor meshes 5 staggered and non-overlapping under orthographic projection, thus forming a detour / bend pressure relief path. When the internal pressure of the battery pack becomes too high and pushes open the piston 3, creating a pressure relief channel between the piston 3 and the valve body 1, the internal pressure of the battery pack is relieved through the aforementioned pressure relief path and channel, achieving the function of pressure relief and explosion prevention. Even if the battery pack pressure relief process is accompanied by the discharge of open flame, when the open flame passes through the detour / bend pressure relief path, i.e., the open flame will be blocked by the first flame arrestor mesh. The first flame arrestor mesh 5 provides initial obstruction, and even after passing through the vent of the first flame arrestor mesh 5, it will be obstructed a second time by the second flame arrestor mesh 5. This disperses the flame impact force and blocks burning flames or sparks, preventing them from escaping the battery pack. The gas is bent after being blocked by the second flame arrestor mesh 5 and then discharged through the vent of the second flame arrestor mesh 5. In other words, this invention can block the open flame that is discharged during the battery pack depressurization process at least twice, achieving both explosion-proof depressurization and flame blocking functions, making it safer and more reliable to use.

[0040] 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. A flame arrestor and explosion-proof valve, comprising a valve body (1) having a pressure relief hole (101), a piston (3) movably mounted on the valve body (1) via a guide rod (2), and a spring (4) mounted between the guide rod (2) and the valve body (1), wherein the piston (3) closes relative to the valve body (1) under the elastic force of the spring (4) to block the pressure relief hole (101), characterized in that: The lower end of the valve body (1) is provided with at least two spaced flame arrestor nets (5) for blocking flames and sparks emitted during thermal runaway. The flame arrestor nets (5) are located below the pressure relief hole (101). Each flame arrestor net (5) has multiple spaced exhaust holes (50), and the exhaust holes (50) of two adjacent flame arrestor nets (5) are staggered and do not overlap under orthographic projection.

2. The flame arrestor and explosion-proof valve according to claim 1, characterized in that: The valve body (1) is provided with a bracket (11) in the middle. The bracket (11) has a central hole (102) through which the guide rod (2) passes and a pressure relief hole (101) located around the central hole (102). The piston (3) abuts against the bracket (11) and is sealed by the first sealing ring (12).

3. The flame arrestor and explosion-proof valve according to claim 1, characterized in that: The number of fire-resistant meshes (5) is three pieces. The number and relative position of the exhaust holes (50) in the two fire-resistant meshes (5) located at the top and bottom are the same. The number and relative position of the exhaust holes (50) in the middle fire-resistant mesh (5) are the same as those in the two fire-resistant meshes (5) located at the top and bottom.

4. The flame arrestor and explosion-proof valve according to claim 1, characterized in that: The number of exhaust holes (50) is four groups, and each group of exhaust holes (50) includes at least two spaced waist-shaped holes.

5. The flame arrestor and explosion-proof valve according to claim 1, characterized in that: The number of exhaust holes (50) is two sets, and each set of exhaust holes (50) includes multiple circular holes or rhomboid holes distributed along an arc.

6. A flame arrestor and explosion-proof valve according to any one of claims 1-5, characterized in that: The valve body (1) has a first stepped groove (103) at its lower opening, and a second stepped groove (104) and a third stepped groove (105) are also provided inside the lower end of the valve body (1); the number of fire-resistant meshes (5) is three pieces, namely, a first fire-resistant mesh (51), a second fire-resistant mesh (52), and a third fire-resistant mesh (53) that are sequentially embedded and fixed in the first stepped groove (103), the second stepped groove (104), and the third stepped groove (105), respectively. The net (51) is also fitted to the lower end face of the bracket (11) and covers the pressure relief hole (101). The second fireproof net (52) and the third fireproof net (53) are respectively provided with a first clearance hole (521) and a second clearance hole (531) at their center. The second fireproof net (52) is sleeved on the outside of the spring (4) through the first clearance hole (521) without contact; the third fireproof net (53) is sleeved on the outside of the spring (4) through the second clearance hole (531) and is in contact and fastened.

7. The flame arrestor and explosion-proof valve according to claim 6, characterized in that: The piston (3) is provided with a stepped groove (31), and the piston (3) has a first vent hole (32) extending downward through the bottom of the stepped groove (31). The upper end of the guide rod (2) is fixedly connected to the lower end of the piston (3), and the guide rod (2) is provided with a second vent hole (21) that extends through the upper and lower ends and connects to the first vent hole (32). A waterproof and breathable membrane (7) is fixed in the stepped groove (31) by hot pressing, ultrasonic welding, or by pressing with a pressure ring (6). The waterproof and breathable membrane (7) covers the first vent hole (32), and the piston (3) has several exhaust grooves (33) opened inward from the outer periphery of the upper end. The piston (3) is fixedly covered with a cover plate (8), which covers the exhaust grooves (33) and the step groove (31). The fireproof mesh (5) at the bottom has a non-porous area (511) in the middle, which is located below the second vent hole (21) in the guide rod (2).

8. The flame arrestor and explosion-proof valve according to claim 7, characterized in that: The cover plate (8) is a magnetic suction plate; or, a magnetic suction piece (81) is fixed on the inner side of the cover plate (8).

9. A flame arrestor and explosion-proof valve according to claim 7, characterized in that: The upper end of the guide rod (2) is also provided with several exhaust holes (22) that pass through the second vent hole (21). When the piston (3) opens outward relative to the valve body (1) to release pressure, the exhaust hole (22) connects the pressure relief channel between the piston (3) and the valve body (1).

10. A flame arrestor and explosion-proof valve according to any one of claims 1-5, characterized in that: The outer edge of the fireproof mesh (5) is also fixed to the inner wall of the valve body (1) by welding or waterproof glue.

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