Anti-explosion pressure release valve

Abstract

The utility model relates to the technical field of water prevention and ventilation, in particular to an anti-explosion pressure relief valve which comprises a valve body and a pressure relief assembly, the valve body is provided with an installation hole, the pressure relief assembly is connected in the installation hole, and the pressure relief assembly comprises a pressure relief seat, an elastic piece arranged at the bottom of the pressure relief seat and a first sealing ring arranged on the pressure relief seat in a sleeved mode. The pressure relief seat is provided with at least one first air hole, and a waterproof breathable film is arranged at the position, corresponding to the first air hole, of the pressure relief seat. The end of the elastic piece is connected with the inner wall of the mounting hole, and the first sealing ring abuts against the inner wall of the mounting hole. The elastic piece is arranged at the bottom of the pressure relief seat, the end of the elastic piece is connected with the inner wall of the mounting hole, and the elastic piece and the pressure relief seat are located in the mounting hole, so that the overall height of the anti-explosion pressure relief valve is reduced, occupied space is reduced, the anti-explosion pressure relief valve can be suitable for equipment with small mounting space, and universality is higher.

Description

Technical Field

[0001] The utility model relates to the technical field of waterproof and breathable technology, in particular to an explosion-proof pressure relief valve. Background Art

[0002] The explosion-proof pressure relief valve is an important component, widely used in equipment that requires waterproof and breathable pressure relief in industries such as petrochemicals, metallurgy, electricity, gas, and automobiles. It is usually installed on the outer casing of the equipment. The core function of the explosion-proof pressure relief valve is to prevent the intrusion of liquids and pollutants while allowing gas molecules to pass through to balance the pressure. When the internal pressure of the equipment or system exceeds the safety threshold, it can quickly relieve pressure to prevent explosion. Taking power batteries as an example, with the rapid development of new energy vehicles, power batteries are increasingly used in automobiles, which puts higher requirements on the safety of power batteries. During the use of power batteries, internal chemical reactions may produce gas, which will cause the pressure inside the battery pack to rise sharply. When the internal pressure exceeds the preset safety value, the valve of the explosion-proof pressure relief valve installed on the battery pack will quickly open to release the internal pressure and avoid explosion, so as to protect the safety of the battery pack, the car, and personnel. The current explosion-proof pressure relief valve uses a coil spring structure to open and close the valve. Its overall height is relatively high, and it has a long structure that extends beyond the valve body, which takes up a lot of space when in use. Corresponding equipment such as battery packs also require targeted designs for the installation of explosion-proof pressure relief valves. For some equipment with relatively limited space, traditional explosion-proof pressure relief valves are difficult to meet the needs. Utility Model Content

[0003] In order to solve the above problems, the utility model provides an explosion-proof pressure relief valve.

[0004] The utility model is implemented by the following scheme:

[0005] An explosion-proof pressure relief valve, characterized by comprising:

[0006] a valve body, wherein the valve body is provided with a mounting hole;

[0007] A pressure relief assembly is connected to the mounting hole, and the pressure relief assembly includes a pressure relief seat, an elastic member arranged at the bottom of the pressure relief seat, and a first sealing ring sleeved on the pressure relief seat. The pressure relief seat is provided with at least one first air hole, and a waterproof breathable membrane is provided at the position of the pressure relief seat corresponding to the first air hole; the end of the elastic member is connected to the inner wall of the mounting hole, and the first sealing ring abuts against the inner wall of the mounting hole.

[0008] Furthermore, the elastic member includes a connecting section connected to the pressure relief seat, a first elastic arm arranged at one end of the connecting section, and a second elastic arm arranged at the other end of the connecting section, the first elastic arm is connected to the inner wall of the mounting hole, and the second elastic arm is connected to the inner wall of the mounting hole.

[0009] Furthermore, a limiting flange is provided on the inner wall of the mounting hole, the first elastic arm abuts against the bottom surface of the limiting flange, and the second elastic arm abuts against the bottom surface of the limiting flange.

[0010] Furthermore, the first elastic arm and the second elastic arm are symmetrically arranged, and the first elastic arm and the second elastic arm both include a first elastic section connected to the connecting section, the first elastic section is folded toward the top surface of the valve body to form a second elastic section, and the second elastic section is a third elastic section folded toward the bottom surface of the valve body.

[0011] Furthermore, a concave portion is provided on the top surface of the pressure relief seat, the first air hole is provided in the concave portion, and the waterproof breathable membrane is provided in the concave portion.

[0012] Furthermore, a top cover is connected to the top surface of the pressure relief seat, a gap for gas flow is provided between the top cover and the top surface of the pressure relief seat, and a gap for gas flow is provided between the outer wall of the top cover and the pressure relief seat.

[0013] Furthermore, a first installation groove is provided on the outer wall of the pressure relief seat, and the first sealing ring is sleeved in the first installation groove.

[0014] Furthermore, a second mounting groove is provided on the bottom surface of the valve body surrounding the mounting hole, and a second sealing ring is provided in the second mounting groove.

[0015] Furthermore, the mounting hole is a stepped hole including a first stepped portion and a second stepped portion, the diameter of the first stepped portion is larger than that of the second stepped portion, and the first sealing ring abuts against an inner wall of the second stepped portion.

[0016] Furthermore, a bottom cover for covering the mounting hole is provided at the bottom of the valve body, and the bottom cover is provided with a second air vent.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The pressure relief seat of the pressure relief assembly in the utility model is arranged in the mounting hole of the valve body, and an elastic part is arranged at the bottom of the pressure relief seat, and the end of the elastic part is connected to the inner wall of the mounting hole. When the internal pressure of the equipment rises sharply, the pressure relief seat moves toward the top surface of the valve body, so that there is a large gap between the pressure relief seat and the valve body, and the gas inside the equipment can be discharged in large quantities to quickly balance the internal and external pressures. The elastic part and the pressure relief seat are located in the mounting hole, which reduces the overall height of the explosion-proof pressure relief valve, thereby reducing the space occupied, so that the explosion-proof pressure relief valve can be suitable for equipment with smaller installation space and is more versatile. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1This is a cross-sectional schematic diagram of an explosion-proof pressure relief valve provided by the utility model.

[0020] Figure 2 It is a schematic diagram of the overall structure of the utility model.

[0021] Figure 3 This is a schematic diagram of the present invention from another angle.

[0022] Figure 4 This is a schematic diagram of another state of the present invention.

[0023] Included in the figure are:

[0024] Valve body 1, mounting hole 11, first stepped portion 111, second stepped portion 112, pressure relief assembly 2, pressure relief seat 21, recessed portion 211, first mounting groove 212, second mounting groove 213, elastic member 22, connecting section 221, first elastic arm 222, first elastic section 222a, second elastic section 222b, third elastic section 222c, second elastic arm 223, first sealing ring 23, first air hole 24, waterproof breathable membrane 25, limiting flange 26, top cover 27, bottom cover 28, second air hole 281, second sealing ring 29. DETAILED DESCRIPTION

[0025] In order to facilitate those skilled in the art to understand the present invention, the present invention will be further described in detail below with reference to specific embodiments and drawings.

[0026] Reference Figures 1 to 4 The utility model provides an explosion-proof pressure relief valve, characterized in that it includes a valve body 1 and a pressure relief assembly 2. The valve body 1 is provided with a mounting hole 11, and the pressure relief assembly 2 is connected to the mounting hole 11.

[0027] The pressure relief assembly 2 includes a pressure relief seat 21, an elastic member 22 disposed at the bottom of the pressure relief seat, and a first sealing ring 23 sleeved on the pressure relief seat 21. The pressure relief seat 21 is provided with at least one first air vent 24, and a waterproof breathable membrane 25 is provided on the pressure relief seat 21 at a position corresponding to the first air vent 24. The end of the elastic member 22 is connected to the inner wall of the mounting hole 11. In the initial state, the first sealing ring 23 abuts against the inner wall of the mounting hole 11. In this embodiment, the elastic member 22 is entirely located in the mounting hole 11, and the height of the valve body 1 is the height of the entire explosion-proof pressure relief valve. Compared with traditional explosion-proof valves using coil springs, the overall height of the present invention is smaller.

[0028] The elastic member 22 includes a connecting section 221 connected to the pressure relief seat 21, a first elastic arm 222 arranged at one end of the connecting section 221, and a second elastic arm 223 arranged at the other end of the connecting section 221. The first elastic arm 222 is connected to the inner wall of the mounting hole 11, and the second elastic arm 223 is connected to the inner wall of the mounting hole 11.

[0029] The inner wall of the mounting hole 11 is provided with a limiting flange 26, the first elastic arm 222 abuts against the bottom surface of the limiting flange 26, and the second elastic arm 223 abuts against the bottom surface of the limiting flange 26. Specifically, when the pressure relief seat 21 moves toward the top surface of the valve body 1 under the action of pressure, the first elastic arm 222 and the second elastic arm 223 of the elastic member 22 will not move due to the obstruction of the limiting flange 26, so that the first elastic arm 222 and the second elastic arm 223 undergo elastic deformation, allowing the pressure relief seat 21 to continue to move. After the gas inside the device is released to the outside, the internal and external pressures are balanced, the first elastic arm 222 and the second elastic arm 223 are restored, and the pressure relief seat 21 returns to its initial position under the pull of the elastic member 22. In this embodiment, the connecting section 221 of the elastic member 22 has a hole for a screw to pass through, and the corresponding position of the pressure relief seat 21 is provided with a hole for installing a screw. The elastic member 22 is locked and fixed to the pressure relief seat 21 by the screw.

[0030] The first elastic arm 222 and the second elastic arm 223 are symmetrically arranged. Each of the first elastic arm 222 and the second elastic arm 223 includes a first elastic section 222a connected to the connecting section 221. The first elastic section 222a is folded toward the top surface of the valve body 1 to form a second elastic section 222b. The second elastic section 222b is folded toward the bottom surface of the valve body 1 to form a third elastic section 222c. The third elastic section 222c abuts the bottom surface of the limiting flange 26. Specifically, the first elastic arm 222 and the second elastic arm 223 are generally S-shaped. Of course, in a specific implementation, the elastic member 22 is not limited to the shapes listed in this embodiment, as long as it can restore the pressure relief seat 21 after deformation.

[0031] The top surface of the pressure relief seat 21 is provided with a lower recess 211, the first air hole 24 is provided in the lower recess 211, and the waterproof breathable membrane 25 is provided in the lower recess 211. The number of the first air holes 24 can be set according to actual needs. In this embodiment, a circle of bosses is provided near the inner wall of the lower recess 211, and the waterproof breathable membrane 25 is connected to the bosses by welding. In specific implementation, a fixing ring can also be provided on the waterproof breathable membrane 25 to ensure the stability of the connection. In addition, a ferromagnetic metal sheet can be connected to the bottom of the top cover 27 to facilitate adsorption during the test process after production is completed to move the pressure relief seat 21. Under normal conditions, gas is exchanged through the first air hole 24 and the waterproof breathable membrane 25 to balance the internal and external pressures.

[0032] The top surface of the pressure relief seat 21 is connected to a top cover 27. A gap for gas flow is provided between the top cover 27 and the top surface of the pressure relief seat 21. A gap for gas flow is provided between the outer wall of the top cover 27 and the top surface of the pressure relief seat 21. In the initial state, the top cover 27 and the top surface of the valve body 1 are flush with or slightly lower than the top surface of the valve body 1. In this embodiment, the top cover 27 is connected to the pressure relief seat 21 via a snap-fit ​​structure. After the top cover 27 is connected to the pressure relief seat 21, a gap is provided between the bottom surface of the top cover 27 and the top surface of the pressure relief seat 21. The gap is provided for gas circulation. Of course, in a specific implementation, a channel for gas circulation can also be provided on the top surface of the pressure relief seat 21 or the bottom surface of the top cover 27.

[0033] A first installation groove 212 is provided on the outer wall of the pressure relief seat 21 , and the first sealing ring 23 is sleeved in the first installation groove 212 .

[0034] The mounting hole 11 is a stepped hole, including a first stepped portion 111 and a second stepped portion 112. The diameter of the first stepped portion 111 is larger than that of the second stepped portion 112, and the first sealing ring 23 abuts against the inner wall of the second stepped portion 112. In this embodiment, the inner wall of the second stepped portion 112 has an inclined surface where it connects to the first stepped portion 111, and the first sealing ring 23 abuts against the inclined surface.

[0035] The bottom surface of the valve body 1 is provided with a second mounting groove 213 surrounding the mounting hole 11. A second sealing ring 29 is disposed within the second mounting groove 213. When the valve body 1 is mounted on the device housing, the second sealing ring 29 abuts against the device housing, forming a seal. Furthermore, screw mounting holes 11 are provided on both sides of the valve body 1 to facilitate connection between the valve body 1 and the device housing.

[0036] The bottom of the valve body 1 is provided with a bottom cover 28 for covering the mounting hole 11, and the bottom cover 28 is provided with a second air vent 281. In the initial state, the bottom cover 28 and the bottom surface of the valve body 1 are flush. After the gas inside the device passes through the second air vent 281, it flows out to the outside from the first air vent 24 and the waterproof breathable membrane 25. At the same time, the external gas can also enter the inside of the device from the opposite path. In this embodiment, the bottom cover 28 and the valve body 1 are connected by a snap-fit ​​connection, and the inner wall of the second step portion 112 of the mounting hole 11 has a card slot, and the snap-fit ​​connection is connected to the card slot. The bottom cover 28 can prevent the internal structure from being directly exposed and protect the internal pressure relief seat 21 and elastic member 22.

[0037] In the present invention, under normal conditions, when the air pressure inside the device is higher than that outside, the gas passes through the second air vent 281, the first air vent 24, and the waterproof breathable membrane 25, and then flows to the outside from the gap between the top cover 27 and the pressure relief seat 21 until the internal and external pressures are balanced. When the air pressure inside the device is lower than that outside, the external gas enters from the gap between the top cover 27 and the pressure relief seat 21, passes through the waterproof breathable membrane 25, the first air vent 24, and the second air vent 281, and then enters the inside of the device until the internal and external pressures are balanced. However, when the internal pressure of the equipment rises sharply, normal gas exchange is no longer able to achieve pressure balance. Under the action of internal pressure, the pressure relief seat 21 moves toward the top surface of the valve body 1, so that the first sealing ring 23 and the inner wall of the second step 112 are separated. At this time, a certain gap is formed between the pressure relief seat 21 and the mounting hole 11, and the internal gas can flow out to the outside from this gap. When the internal and external pressures are balanced, the pressure relief seat 21 is reset under the action of the elastic member 22, and the first sealing ring 23 abuts the inner wall of the second step 112.

[0038] In the description of the present invention, it should be understood that the indicated orientations or positional relationships are only for the purpose of facilitating the description of the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0039] Furthermore, the terms "first," "second," and so on are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referenced. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically defined.

[0040] In this utility model, unless otherwise specified or limited, the terms "connection" and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0041] Although the present invention has been described with reference to the above specific embodiments, it is apparent that those skilled in the art can make many substitutions, modifications, and variations based on the above. Therefore, all such substitutions, modifications, and variations are intended to fall within the scope of the appended claims.

Claims

1. An explosion-proof pressure relief valve, characterized in that: include: a valve body, wherein the valve body is provided with a mounting hole; A pressure relief assembly is connected to the mounting hole, the pressure relief assembly including a pressure relief seat, an elastic member disposed at the bottom of the pressure relief seat, a first sealing ring sleeved on the pressure relief seat, the pressure relief seat being provided with at least one first air vent, and a waterproof breathable membrane being provided at a position of the pressure relief seat corresponding to the first air vent; an end of the elastic member is connected to the inner wall of the mounting hole, and the first sealing ring abuts against the inner wall of the mounting hole; The elastic member includes a connecting section connected to the pressure relief seat, a first elastic arm arranged at one end of the connecting section, and a second elastic arm arranged at the other end of the connecting section, the first elastic arm is connected to the inner wall of the mounting hole, and the second elastic arm is connected to the inner wall of the mounting hole.

2. The explosion-proof pressure relief valve according to claim 1, characterized in that: The inner wall of the mounting hole is provided with a limiting flange, the first elastic arm abuts against the bottom surface of the limiting flange, and the second elastic arm abuts against the bottom surface of the limiting flange.

3. The explosion-proof pressure relief valve according to claim 1, characterized in that: The first elastic arm and the second elastic arm are symmetrically arranged, and both the first elastic arm and the second elastic arm include a first elastic section connected to the connecting section, the first elastic section is folded toward the top surface of the valve body to form a second elastic section, and the second elastic section is a third elastic section folded toward the bottom surface of the valve body.

4. The explosion-proof pressure relief valve according to claim 1, characterized in that: A concave portion is provided on the top surface of the pressure relief seat, the first air hole is provided in the concave portion, and the waterproof air-permeable membrane is provided in the concave portion.

5. The explosion-proof pressure relief valve according to claim 1, characterized in that: The top surface of the pressure relief seat is connected to a top cover, a gap for gas flow is provided between the top cover and the top surface of the pressure relief seat, and a gap for gas flow is provided between the outer wall of the top cover and the pressure relief seat.

6. The explosion-proof pressure relief valve according to claim 1, characterized in that: The outer wall of the pressure relief seat is provided with a first installation groove, and the first sealing ring is sleeved in the first installation groove.

7. The explosion-proof pressure relief valve according to claim 1, characterized in that: The bottom surface of the valve body is provided with a second mounting groove surrounding the mounting hole, and a second sealing ring is provided in the second mounting groove.

8. The explosion-proof pressure relief valve according to claim 1, characterized in that: The mounting hole is a stepped hole including a first stepped portion and a second stepped portion. The diameter of the first stepped portion is larger than that of the second stepped portion. The first sealing ring abuts against the inner wall of the second stepped portion.

9. The explosion-proof pressure relief valve according to claim 1, characterized in that: A bottom cover for covering the mounting hole is provided at the bottom of the valve body, and the bottom cover is provided with a second air vent.

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