Moisture-resistant explosion-proof valve

Abstract

The moisture-proof explosion-proof valve comprises a shell assembly and a diaphragm assembly, the shell assembly comprises a body, a reset component and a cover body, the reset component and the cover body are arranged on the body, and when the internal and external pressure difference of the diaphragm assembly is smaller than a preset value, the reset component enables the cover body to seal a second opening, and a closed space is formed by the reset component, the body and the outer surface of equipment; when the internal and external pressure difference of the diaphragm assembly reaches or exceeds a preset value and is smaller than a blasting pressure difference value, the cover body opens the second opening to a first conduction state under the action of pressure torque; when the internal and external pressure difference of the diaphragm assembly reaches or exceeds a blasting pressure difference value, the cover body opens the second opening to a second conducting state under the action of pressure torque; and when the internal and external pressure difference of the diaphragm assembly is reduced to be lower than a preset value from the preset value or above, the reset component drives the cover body to reset, and the second opening is sealed. According to the moisture-proof explosion-proof valve, moisture entering equipment is obviously reduced under the condition that the normal explosion-proof function and the ventilation requirement of the equipment are not influenced.

Description

Technical Field

[0001] This utility model relates to the field of explosion-proof valve technology, and in particular to a moisture-proof explosion-proof valve. Background Technology

[0002] The prior art, patent number CN218648096U, discloses an explosion-proof valve, including a valve cover and a valve seat that can be joined together; a waterproof and breathable membrane is provided in the pressure relief channel of the valve seat. The core component of this explosion-proof valve is the waterproof and breathable membrane, which is actually a PTFE membrane. Its function is to prevent liquid water, particles and other contaminants from entering the valve body. At the same time, it enables gas exchange between the inside and outside of the valve body to balance the internal and external pressure difference of the valve body. Furthermore, when the battery pack experiences thermal runaway and the internal and external pressure difference of the valve body rises sharply, the PTFE membrane expands and bulges upward, comes into contact with the puncture device on the valve cover, is punctured by the puncture device, and then rapidly releases pressure to avoid an explosion.

[0003] In existing explosion-proof valves, the pressure relief channel is directly connected to the outside. Therefore, throughout the valve's lifespan, the waterproof and breathable membrane remains open to the atmosphere, allowing moisture from the external environment to enter the equipment. Especially in high humidity conditions, moisture condenses on the membrane surface, clogging the PTFE membrane pores and affecting breathability. Furthermore, because the PTFE membrane allows for gas exchange, when the battery pack undergoes discharge or a temperature drop, creating negative pressure inside, external air enters through the PTFE membrane to balance the pressure difference. Moisture also enters the battery pack along with this air, potentially condensing inside and causing circuit malfunctions and even accidents.

[0004] Therefore, improvements are needed to the explosion-proof valve to address the issue of external moisture entering its interior. Utility Model Content

[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a moisture-proof and explosion-proof valve, which solves the problem that the existing explosion-proof valves are prone to allowing external moisture to enter the interior of the explosion-proof valve.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A moisture-proof and explosion-proof valve includes a housing assembly and a diaphragm assembly, wherein the diaphragm assembly includes at least a waterproof and breathable membrane for sealing and covering the ventilation openings of the equipment, and is capable of bursting when the pressure difference between its inside and outside reaches or exceeds the burst pressure difference value.

[0008] The housing assembly includes a body, a reset member and a cover disposed on the body. The body includes an inner cavity and a first opening and a second opening communicating with the inner cavity. The first opening can be sealed and fixed to the outer periphery of the vent. The diaphragm assembly is located in the inner cavity. The second opening is located at one end of the body away from the vent. The cover is connected to the reset member and is movably disposed in the second opening through the reset member.

[0009] When the pressure difference between the inside and outside of the diaphragm assembly is less than a preset value, the cover seals the second opening under the action of the reset member, and forms a sealed space with the body and the outer surface of the device;

[0010] When the pressure difference between the inside and outside of the diaphragm assembly reaches or exceeds a preset value, but is less than the burst pressure difference value, the cover opens the second opening to the first conductive state under the action of pressure torque.

[0011] When the pressure difference between the inside and outside of the diaphragm assembly reaches or exceeds the burst pressure difference value, the cover opens the second opening to the second conduction state under the action of pressure torque;

[0012] And when the pressure difference between the inside and outside of the diaphragm assembly decreases from a value at or above the preset value to a value below the preset value, the reset member drives the cover to reset and seals the second opening;

[0013] The opening degree of the second opening in the first conducting state is smaller than that in the second conducting state.

[0014] This utility model's moisture-proof and explosion-proof valve can prevent external moisture from entering the housing assembly during normal equipment operation. In most cases, during normal equipment operation, the pressure and temperature changes inside the equipment are minimal, the pressure on both sides of the diaphragm assembly is basically balanced, and the pressure difference between its inside and outside is much smaller than the preset value. The cover remains sealed to the body under the action of the reset component. The first opening of the body is sealed on the outer periphery of the equipment's ventilation port, and the second opening is sealed by the cover. Therefore, the inside of the body is in a sealed state, and the diaphragm assembly located inside the body is isolated from the external environment but remains connected to the inside of the equipment, allowing gas exchange through the diaphragm assembly. This maintains the pressure difference state, achieving pressure balance between the equipment and the housing assembly, without affecting the performance and safety of the equipment. The equipment and the housing assembly do not exchange gases with the external environment, preventing moisture from entering the housing assembly and preventing moisture from entering the equipment through the diaphragm assembly.

[0015] Under certain operating conditions of the equipment, when the internal and external pressure difference of the diaphragm assembly reaches or exceeds a preset value but is less than the burst pressure difference value, the internal and external pressure difference acts on the cover through the diaphragm assembly. The final result is that the cover, under the action of the resultant force or resultant torque of the reset component and the internal and external pressure, opens the second opening to the first conductive state, and the inner cavity is connected to the external environment. The equipment can then exchange gases with the external environment through the diaphragm assembly, achieving pressure balance between the equipment, the shell assembly, and the external environment. After pressure balance, the cover can reseal the second opening of the body to prevent moisture from entering the equipment.

[0016] It is important to note that the pressure difference between the inside and outside of the diaphragm assembly refers to the pressure difference between the surface of the diaphragm assembly facing the inside of the equipment and the surface facing the inner cavity of the housing assembly. In other words, it is the pressure difference between the pressure inside the equipment and the pressure in the inner cavity, including two cases: the pressure in the inner cavity is less than the pressure in the equipment (positive pressure in the equipment) and the pressure in the inner cavity is greater than the pressure in the equipment (negative pressure in the equipment).

[0017] When the equipment is under positive pressure, gas inside the equipment enters the inner cavity through the diaphragm assembly, increasing the pressure inside the cavity. When the pressure difference between the inside and outside of the diaphragm assembly is greater than or equal to a preset value, the pressure difference between the inner cavity and the external environment becomes sufficiently large. Under the combined force or torque of the reset component, the inner cavity pressure, and the external pressure, the cover opens the second opening, allowing the gas inside the cavity to escape to the external environment. When the equipment is under negative pressure, gas inside the inner cavity enters the equipment through the diaphragm assembly, decreasing the pressure inside the cavity. Again, the pressure difference between the inside and outside of the diaphragm assembly is greater than or equal to a preset value, again ensuring a sufficiently large pressure difference between the inner cavity and the external environment. Under the combined force or torque of the reset component, the inner cavity pressure, and the external pressure, the cover opens the second opening, allowing gas from the external environment to enter the inner cavity and then pass through the diaphragm assembly into the equipment. The difference between positive and negative pressure is that the direction of cover opening is opposite.

[0018] The equipment exchanges gas with the external environment through a diaphragm assembly and its inner cavity. This includes two scenarios: gas from the external environment flowing into the equipment through the diaphragm assembly, and gas from inside the equipment being discharged to the external environment through the diaphragm assembly and inner cavity. When the equipment is under negative pressure, during the process of gas flowing into the equipment through the diaphragm assembly, water vapor from the external environment may flow into the inner cavity along with the air. However, this is unlikely, or rather, situations where the equipment is under negative pressure and the negative pressure exceeds a preset value are rare. Throughout the equipment's lifespan, water vapor will only flow into the equipment for a very short period. When the equipment is under positive pressure, or even in a high-humidity environment, water vapor cannot enter the equipment through the diaphragm assembly. Therefore, the moisture-blocking and explosion-proof valve of this invention can seal the second opening for the vast majority of its operating time, thus achieving a moisture-blocking function.

[0019] When the pressure difference between the inside and outside of the diaphragm assembly reaches or exceeds the burst pressure difference value, the corresponding abnormal operating condition of the equipment is reached. Typically, the pressure difference between the inside and outside of the diaphragm assembly reaches or exceeds the burst pressure difference value in a very short time. The diaphragm assembly bursts instantly, forming a large rupture. The gas inside the equipment is rapidly discharged into the inner cavity. The pressure or pressure torque on the cover is much greater than the force or torque provided by the reset component. Under the action of the corresponding resultant force or resultant torque, the cover quickly opens the second opening to the second conductive state, quickly releasing the seal between the cover and the body. This achieves communication between the equipment, the inner cavity, and the external environment in a very short time, thereby enabling the gas to be discharged in a very short time and achieving rapid depressurization. After the depressurization is completed, the cover returns to its original position under the action of the reset component, resealing the second opening of the body to prevent oxygen from entering the equipment and to prevent a secondary explosion.

[0020] Based on the above structure, the moisture-proof explosion-proof valve of this utility model has normal explosion-proof function compared with existing explosion-proof valves. It can meet the waterproof and breathable requirements of the equipment. Under the premise that the equipment can withstand a certain negative pressure, it can keep the diaphragm assembly sealed and isolated from the external environment for most of the service life of the equipment and the explosion-proof valve, which significantly reduces the moisture entering the inner cavity and the equipment. Even if there is a humidity gradient between the equipment and the external environment, water vapor in the external environment cannot flow into the equipment through the diaphragm assembly, thus protecting the diaphragm assembly and the equipment.

[0021] Preferably, the cover is rotatable in the second opening; when the cover rotates relative to the body, its axis of rotation is eccentric relative to the center of the cover, and the reset member is connected between the cover and the body.

[0022] The cover opens the second opening by flipping. Based on the pressure difference between the inside and outside of the diaphragm assembly, the flipping range of the cover is different, so that the second opening is kept sealed or opened to the first conduction state or opened to the second conduction state.

[0023] Specifically, when the pressure difference between the inside and outside of the diaphragm assembly is less than the preset value, under the combined force and torque of the force of the reset component and the pressure generated by the pressure difference between the inside and outside of the cover, the cover remains stationary relative to the body and seals the second opening.

[0024] When the pressure difference between the inside and outside of the diaphragm assembly is greater than or equal to the preset value and less than the burst pressure difference value, under the combined force and torque of the force of the reset component and the pressure generated by the pressure difference between the inside and outside of the cover, the cover rotates relative to the body at a certain angle, opening the second opening to the first conductive state, the inner cavity is connected to the external environment, and the gas in the external environment can exchange with the gas in the inner cavity, realizing the pressure balance between the equipment and the shell assembly and the external environment. After the pressure balance is achieved, the cover can reseal the second opening of the body to prevent moisture from entering the equipment.

[0025] When the pressure difference between the inside and outside of the diaphragm assembly is greater than or equal to the burst pressure difference, the diaphragm assembly bursts rapidly. Under the combined force and torque of the force of the reset component and the pressure generated by the pressure difference between the inside and outside of the cover, the cover flips rapidly, opening the second opening to the second conductive state, connecting the inner cavity with the external environment, allowing the gas inside the equipment to be quickly discharged to the external environment through the inner cavity, thus achieving pressure relief. After pressure relief is completed, the cover returns to its original position under the action of the reset component, resealing the second opening of the body to prevent oxygen from entering the equipment and to prevent a secondary explosion.

[0026] Preferably, the cover includes a plate portion adapted to the shape of the second opening and a rotating shaft fixedly connected to the plate portion. The rotating shaft is rotatably connected to the body and is eccentrically positioned relative to the center of the plate portion, dividing the plate portion into a first part and a second part with unequal areas.

[0027] The reset component is a torsion spring fixedly sleeved on the rotating shaft, and the torsion spring is connected to the body.

[0028] The elastic modulus of the torsion spring and the area difference between the first and second portions satisfy the following:

[0029] Under the corresponding internal and external pressure difference value of the diaphragm assembly, the plate portion seals the second opening, or opens the second opening to the first conduction state, or opens the second opening to the second conduction state.

[0030] The pivot is set eccentrically, which divides the inner surface of the plate into two areas of unequal size. At the same time, the preload of the torsion spring is used to maintain the balance of the cover. Under the same internal pressure, the pressure torque on the two areas of the plate is not equal, and the plate tends to flip relative to the main body.

[0031] When the pressure difference between the inside and outside of the diaphragm assembly is less than the preset value, the pressure torque on the plate is less than the preload torque of the torsion spring, the plate remains stationary relative to the body, and the second opening is sealed.

[0032] When the pressure difference between the inside and outside of the diaphragm assembly is greater than or equal to the preset value and less than the burst pressure difference, regardless of whether the pressure in the inner cavity is greater than or less than the pressure in the equipment, the final result is that the pressure torque on the plate is greater than the torsion torque of the torsion spring, and the plate rotates around the pivot, opening the second opening to the first conduction state; the difference between the working condition where the pressure in the inner cavity is greater than the pressure in the equipment and the working condition where the pressure in the inner cavity is less than the pressure in the equipment is that the plate flips in the opposite direction.

[0033] When the pressure difference between the inside and outside of the diaphragm assembly is greater than or equal to the burst pressure difference, the diaphragm assembly bursts rapidly. The pressure torque on the plate is much greater than the torque of the torsion spring, and the plate flips rapidly, opening the second opening to the second conduction state. At this time, the torque of the torsion spring is even greater. When the internal pressure drops, the pressure torque on the plate is less than the torque of the torsion spring, and the cover flips in the opposite direction relative to the body to return to the initial position, sealing the second opening.

[0034] Preferably, the reset component is a torsion bar spring, which is connected to the cover and the body respectively, and is eccentrically positioned relative to the center of the cover, dividing the cover into a first part and a second part with unequal areas;

[0035] The elastic modulus of the torsion bar spring and the area difference between the first and second portions satisfy the following:

[0036] Under the corresponding internal and external pressure difference value of the diaphragm assembly, the cover seals the second opening, or opens the second opening to the first conductive state, or opens the second opening to the second conductive state.

[0037] Torsion springs can also generate torsional force. The cover rotates around the axis of the torsion spring, with the torsion spring set eccentrically. The axis of the torsion spring divides the inner surface of the cover into two regions of unequal area. At the same time, the preload of the torsion spring is used to maintain the balance of the cover. Under the same internal pressure, the pressure torques on the two regions of the cover are not equal, and the cover has a tendency to flip relative to the main body.

[0038] When the pressure difference between the inside and outside of the diaphragm assembly is less than the preset value, the pressure torque on the cover is less than the preload torque of the torsion bar spring, the cover remains stationary relative to the body, and the second opening is sealed.

[0039] When the pressure difference between the inside and outside of the diaphragm assembly is greater than or equal to the preset value and less than the burst pressure difference, regardless of whether the pressure in the inner cavity is greater than the pressure inside the equipment or less than the pressure inside the equipment, the final result is that the pressure torque on the cover is greater than the torsion torque of the torsion bar spring, and the cover rotates around the pivot, opening the second opening to the first conduction state. The difference between the working condition where the pressure in the inner cavity is greater than the pressure inside the equipment and the working condition where the pressure in the inner cavity is less than the pressure inside the equipment is that the cover flips in the opposite direction.

[0040] When the pressure difference between the inside and outside of the diaphragm assembly is greater than or equal to the burst pressure difference, the diaphragm assembly bursts rapidly. The pressure torque on the cover is much greater than the torque of the torsion bar spring, and the cover flips rapidly, opening the second opening to the second conductive state. At this time, the torque of the torsion bar spring is even greater. When the internal pressure drops, the pressure torque on the cover is less than the torque of the torsion bar spring, and the cover flips in the opposite direction relative to the body to return to the initial position, sealing the second opening.

[0041] Preferably, a sealing element is provided at the second opening. When the pressure difference between the inside and outside of the diaphragm assembly is less than a preset value, the cover body, under the action of the reset member, abuts against the sealing element on its side, thereby sealing the second opening.

[0042] The function of the seal is to improve the sealing performance of the cover to the second opening. When the cover is flipped, one edge of the cover protrudes out of the inner cavity of the cover and the other edge enters the inner cavity of the cover. The edge that enters the inner cavity of the cover will squeeze the seal. Therefore, the side of the cover is pressed against the inner side of the seal to achieve a side seal. This reduces the pressure of the cover on the seal during the flipping process, reduces the interference of the seal on the cover, and makes the cover easier to flip.

[0043] Preferably, the second opening faces upward, the main body has a fixing member, the fixing member is disposed opposite to the cover, the reset member is a helical spring, one end of the helical spring is connected to the fixing member, and the other end is connected to the cover;

[0044] The weight of the cover and the elastic modulus of the helical spring satisfy the following:

[0045] Under the corresponding internal and external pressure difference value of the diaphragm assembly, the cover seals the second opening, or opens the second opening to the first conductive state, or opens the second opening to the second conductive state.

[0046] The helical spring connects the cover and the body, and based on the magnitude of the pressure difference between the inside and outside of the diaphragm assembly, keeps the second opening sealed or opens it to the first conductive state or to the second conductive state.

[0047] Specifically, when the pressure difference between the inside and outside of the diaphragm assembly is less than the preset value, the cover remains stationary relative to the main body under the combined force of the reset component, the weight of the cover itself, and the pressure generated by the pressure difference between the inside and outside of the cover, and seals the second opening.

[0048] When the pressure difference between the inside and outside of the diaphragm assembly is greater than or equal to a preset value but less than the burst pressure difference value, the cover will move relative to the body to open the second opening. Since there are two scenarios—positive pressure and negative pressure—the direction of movement of the cover relative to the body will differ. Specifically, when the pressure inside the equipment rises and exceeds the external pressure, causing the pressure difference between the inside and outside of the diaphragm assembly to exceed the preset value, the internal pressure becomes greater than the external pressure due to the diaphragm assembly's connectivity. This exerts an outward force on the cover. Based on the combined force of the internal pressure, external pressure, the force exerted on the cover by the reset component, and the cover's gravity, the cover opens the second opening to the first conductive state. Gas from the external environment can exchange with the gas in the internal cavity, achieving pressure balance between the equipment, the housing assembly, and the external environment. After pressure balance, the cover returns to its original position, resealing the second opening of the body. To prevent moisture from entering the equipment: When the pressure inside the equipment drops and becomes less than the external pressure, causing the pressure difference between the inside and outside of the diaphragm assembly to exceed a preset value, the internal pressure becomes less than the external pressure due to the interconnection of the diaphragm assembly. Based on the combined force of the internal pressure, external pressure, the force exerted by the reset component on the cover, and the weight of the cover, the cover opens the second opening inward to the first conductive state, allowing the gas in the external environment to exchange with the gas in the internal cavity, achieving pressure balance between the equipment, the housing assembly, and the external environment. After pressure balance, the cover returns to its original position, resealing the second opening of the body to prevent moisture from entering the equipment.

[0049] When the pressure difference between the inside and outside of the diaphragm assembly is greater than or equal to the burst pressure difference, it corresponds to an abnormal operating condition of the equipment. The pressure inside the equipment reaches or exceeds the burst pressure difference in a very short time, causing the diaphragm assembly to burst rapidly. When the internal pressure is much greater than the external air pressure, the outward force of the internal pressure on the cover is much greater than the inward pulling force of the reset component on the cover and the weight of the cover. The cover moves outward rapidly, opening the second opening to the second conductive state, allowing the gas inside the equipment to be quickly discharged to the external environment through the internal cavity, thus achieving pressure relief. After the pressure relief is completed, the cover returns to its original position under the action of the reset component, resealing the second opening of the main body to prevent oxygen from entering the equipment and to prevent a secondary explosion.

[0050] Preferably, a sealing element is provided at the second opening.

[0051] When the pressure difference between the inside and outside of the diaphragm assembly is less than a preset value, the edge of the lower surface of the cover abuts against the sealing element under the action of the reset member, thereby sealing the second opening.

[0052] The function of the seal is to improve the sealing performance of the cover to the second opening. When the cover is raised, it gradually moves away from the seal, and the seal will not interfere with the raising of the cover, making it easier to raise and lower the cover.

[0053] Preferably, the housing assembly is provided with a puncture member, which is positioned toward the diaphragm assembly;

[0054] The puncturing element is fixedly connected to the body or to the cover.

[0055] The function of the puncture device is to quickly rupture the diaphragm assembly when the pressure difference between the inside and outside of the diaphragm assembly is greater than or equal to the burst pressure difference value, so that the inside of the equipment is directly connected to the inner cavity, achieving rapid pressure relief and explosion prevention. When the puncture device is fixedly connected to the body, the distance between the puncture device and the ventilation port remains unchanged, which can puncture the diaphragm assembly more accurately. In some cases, the puncture device is set on the cover. When the cover is opened with a second opening, the puncture device can be brought closer to the diaphragm assembly, accelerating the bursting of the diaphragm assembly.

[0056] Preferably, the housing assembly and the diaphragm assembly are separately disposed, the main body is sealed and fixed to the outer periphery of the vent, and the diaphragm assembly seals and covers the vent; specifically, the diaphragm assembly is sealed and fixed to the vent of the equipment by bonding or welding, the main body of the housing assembly is sealed and fixed to the vent and the outer periphery of the diaphragm assembly, and the cover is movably disposed in the second opening of the main body by a reset member, and the inner cavity of the main body is sealed and isolated from the external environment.

[0057] Alternatively, the housing assembly includes a fixing bracket located inside the body for fixing the diaphragm assembly. The outer periphery of the fixing bracket is sealed to the inner wall of the body. The fixing bracket has a vent hole communicating with the vent. The diaphragm assembly is sealed and fixed to the fixing bracket and covers the vent hole to seal and cover the vent. Specifically, the diaphragm assembly is sealed and fixed to the surface of the fixing bracket by bonding or welding and covers the vent hole. The body is sealed and fixed to the outer periphery of the vent. The cover is movably disposed at the second opening of the body by a reset member. The inner cavity of the body is sealed and isolated from the external environment.

[0058] Preferably, the diaphragm assembly is a single waterproof and breathable membrane that can be used in conjunction with a puncture device to burst; or, the diaphragm assembly includes a waterproof and breathable membrane and an elastic membrane that deforms under pressure, wherein the elastic membrane is circular and corresponds to the central area of ​​the vent, and the waterproof and breathable membrane is annular and surrounds the outer side of the elastic membrane, resulting in a more compact structure and facilitating miniaturization; the elastic membrane can burst on its own or burst in conjunction with a puncture device.

[0059] In summary, compared with the prior art, the present invention has at least the following beneficial effects:

[0060] This utility model's moisture-proof and explosion-proof valve can prevent external moisture from entering the housing assembly during normal equipment operation. In most cases, during normal equipment operation, the pressure and temperature changes inside the equipment are minimal, the pressure on both sides of the diaphragm assembly is basically balanced, and the internal and external pressure difference is much smaller than the preset value. The cover remains sealed to the body under the action of the reset component. The first opening of the body is sealed on the outer periphery of the equipment's ventilation port, and the second opening is sealed by the cover. Therefore, the inside of the body is in a sealed state, and the diaphragm assembly located inside the body is isolated from the external environment but remains connected to the inside of the equipment, allowing gas exchange through the diaphragm assembly. This maintains the pressure difference state and achieves pressure balance between the equipment and the housing assembly, without affecting the performance and safety of the equipment. The equipment and the housing assembly do not exchange gases with the external environment, preventing moisture from entering the housing or even the equipment itself.

[0061] Under certain operating conditions, when the pressure difference between the inside and outside of the diaphragm assembly reaches or exceeds a preset value but is less than the burst pressure difference value, the cover, under the action of a resultant force or resultant torque, opens the second opening to the first conductive state, connecting the inner cavity with the external environment. The device can then exchange gases with the external environment through the diaphragm assembly, achieving pressure balance between the device, the housing assembly, and the external environment. After pressure balance, the cover can reseal the second opening of the main body, preventing moisture from entering the device. It should be noted that this operating condition occurs only briefly relative to the valve's entire lifespan.

[0062] When the pressure difference between the inside and outside of the diaphragm assembly reaches or exceeds the burst pressure difference value, the diaphragm assembly bursts instantly, forming a large rupture. Under the action of the resultant force or resultant torque, the cover opens the second opening to the second conductive state, quickly releasing the seal between the cover and the body, and realizing the connection between the inner cavity and the external environment in a very short time. This allows gas to be discharged in a very short time, achieving rapid depressurization. After depressurization, the cover returns to its original position under the action of the reset component, resealing the second opening of the body to prevent oxygen from entering the equipment and to prevent a secondary explosion.

[0063] Based on the above structure, the moisture-proof explosion-proof valve of this utility model has normal explosion-proof function compared with existing explosion-proof valves. It can meet the waterproof and breathable requirements of the equipment. Under the premise that the equipment can withstand a certain negative pressure, it can keep the diaphragm assembly sealed and isolated from the external environment for most of the service life of the equipment and the explosion-proof valve, which significantly reduces the moisture entering the inner cavity and the equipment. Even if there is a humidity gradient between the equipment and the external environment, water vapor in the external environment cannot flow into the equipment through the diaphragm assembly, thus protecting the diaphragm assembly and the equipment. Attached Figure Description

[0064] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0065] Figure 1 This is a schematic diagram of the moisture-proof and explosion-proof valve installed on the equipment according to an embodiment of the present utility model;

[0066] Figure 2 for Figure 1 Enlarged view of point A in the image;

[0067] Figure 3 This is a cross-sectional schematic diagram of the moisture-proof and explosion-proof valve of Embodiment 1 of this utility model at the equipment ventilation opening;

[0068] Figure 4 This is a cross-sectional schematic diagram of the moisture-proof and explosion-proof valve of Embodiment 2 of this utility model at the equipment ventilation port;

[0069] Figure 5 This is a schematic diagram of the structure of the cover body according to Embodiment 3 of this utility model;

[0070] Figure 6 This is a cross-sectional structural diagram of the moisture-proof and explosion-proof valve according to Embodiment 3 of this utility model;

[0071] Figure 7 This is a cross-sectional structural diagram of the moisture-proof and explosion-proof valve according to Embodiment 3 of this utility model, which shows the second opening of the cover sealing.

[0072] Figure 8 This is a cross-sectional structural diagram of the moisture-proof and explosion-proof valve according to Embodiment 3 of the present utility model, which shows the cover opening from the second opening to the first conductive state;

[0073] Figure 9 This is a cross-sectional structural diagram of the moisture-proof and explosion-proof valve according to Embodiment 3 of the present invention, showing the cover opening to the second conduction state;

[0074] Figure 10 This is a cross-sectional structural diagram of the moisture-proof and explosion-proof valve according to Embodiment 4 of this utility model, which shows the second opening of the cover sealing.

[0075] Figure 11 This is a cross-sectional structural diagram of the moisture-proof and explosion-proof valve of Embodiment 4 of this utility model, which shows the cover opening from the second opening to the first conductive state;

[0076] Figure 12This is a cross-sectional structural diagram of the moisture-proof and explosion-proof valve of Embodiment 4 of this utility model, which shows another case where the cover is opened to the first conductive state through the second opening.

[0077] Figure 13 This is a cross-sectional structural diagram of the moisture-proof and explosion-proof valve of Embodiment 4 of this utility model, showing the second opening of the cover to the second conduction state.

[0078] Explanation of reference numerals in the attached figures

[0079] 10. Shell assembly; 11. Body; 111. First opening; 112. Second opening; 113. Inner cavity; 114. Mounting hole; 115. Limiting groove; 12. Reset component; 121. Torsion bar spring; 122. Connector; 123. Torsion spring; 124. Helical spring; 13. Cover; 131. Plate; 132. Rotating shaft; 133. First section; 134. Second section; 14. Puncture component; 15. Fixing component; 16. Sealing component; 17. Fixing bracket; 171. Vent hole;

[0080] 20. Membrane assembly; 21. Waterproof and breathable membrane; 22. Elastic membrane;

[0081] 30. Equipment; 31. Ventilation opening. Detailed Implementation

[0082] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0083] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0084] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0085] like Figure 1 and Figure 2 As shown, the moisture-proof and explosion-proof valve of this embodiment is installed on device 30. Device 30 can be a battery pack, electric drive device, outdoor electronic equipment, or other equipment with explosion-proof requirements. The moisture-proof and explosion-proof valve includes a housing assembly 10 and a diaphragm assembly 20. The diaphragm assembly 20 includes at least a waterproof and breathable membrane 21, which is used to seal and cover the ventilation opening 31 of device 30, enabling gas exchange. It can burst when the pressure difference between its inside and outside reaches or exceeds the burst pressure difference value, thereby achieving rapid pressure relief of device 30.

[0086] The housing assembly 10 includes a body 11, a reset member 12 and a cover 13 disposed on the body 11. The body 11 includes an inner cavity 113 and a first opening 111 and a second opening 112 communicating with the inner cavity 113. The first opening 111 can be sealed and fixed to the outer periphery of the vent 31. The diaphragm assembly 20 is located in the inner cavity 113. The second opening 112 is located at the end of the body 11 away from the vent 31. The cover 13 is connected to the reset member 12 and is movably disposed in the second opening 112 through the reset member 12.

[0087] When the internal and external pressure difference of the diaphragm assembly 20 is less than a preset value, the reset member 12 causes the cover 13 to seal the second opening 112 and form a sealed space with the body 11 and the outer surface of the device 30; when the internal and external pressure difference of the diaphragm assembly 20 reaches or exceeds the preset value but is less than the burst pressure difference value, the cover 13 opens the second opening 112 to the first conduction state under the combined force or torque of the internal and external pressure and the force provided by the reset member; when the internal and external pressure difference of the diaphragm assembly 20 reaches or exceeds the burst pressure difference value, the cover 13 opens the second opening 112 to the second conduction state under the combined force or torque of the internal and external pressure and the force provided by the reset member; and when the internal and external pressure difference of the diaphragm assembly 20 decreases from a value at or above the preset value to a value below the preset value, the reset member 12 drives the cover 13 to reset and seal the second opening 112; the opening degree of the second opening 112 in the first conduction state is less than the opening degree in the second conduction state.

[0088] The moisture-proof and explosion-proof valve of this invention can prevent external moisture from entering the housing assembly 10 when the equipment 30 is working normally. In most cases, when the equipment 30 is working normally, the pressure and temperature changes inside the equipment 30 are very small, the pressure on both sides of the diaphragm assembly 20 is basically balanced, and the pressure difference between the inside and outside is much smaller than the preset value. Under the action of the reset member 12, the cover 13 is sealed with the body 11. The first opening 111 of the body 11 is sealed on the outer periphery of the ventilation port 31 of the equipment 30, and the second opening 112 is sealed by the cover 13. Therefore, the inside of the body 11 is in a sealed state. The diaphragm assembly 20 located inside the body 11 is isolated from the external environment, but is connected to the inside of the equipment 30. Gas exchange can be carried out through the diaphragm assembly 20 to maintain the pressure difference state and achieve pressure balance between the equipment 30 and the housing assembly 10. It will not affect the performance and safety of the equipment 30. The equipment 30 and the housing assembly 10 will not exchange gases with the external environment, preventing moisture from entering the housing or even the inside of the equipment 30.

[0089] Under certain operating conditions of the device 30, when the internal and external pressure difference on both sides of the diaphragm assembly 20 reaches or exceeds a preset value but is less than the burst pressure difference value, the internal and external pressure difference acts on the cover 13 through the diaphragm assembly 20. The final result is that the cover 13, under the action of the corresponding resultant force or resultant torque, opens the second opening 112 to the first conduction state, and the inner cavity 113 is connected to the external environment. The device 30 can then exchange gases with the external environment through the diaphragm assembly 20, achieving pressure balance between the device 30, the shell assembly 10, and the external environment. After pressure balance, the cover 13 can reseal the second opening 112 of the body 11 to prevent moisture from entering the device 30.

[0090] When the pressure difference between the inside and outside of the diaphragm assembly 20 reaches or exceeds the burst pressure difference value, the diaphragm assembly 20 bursts instantly, forming a large rupture. Under the action of the corresponding resultant force or resultant torque, the cover 13 opens the second opening 112 to the second conductive state, quickly releasing the seal between the cover 13 and the body 11, and realizing the connection between the inner cavity 113 and the external environment in a very short time, thereby enabling the gas to be discharged in a very short time and achieving rapid depressurization. After the depressurization is completed, the cover 13 returns to its original position under the action of the reset member 12, and reseals the second opening 112 of the body 11 to prevent oxygen from entering the interior of the device 30 and prevent a secondary explosion.

[0091] Based on the above structure, the moisture-proof and explosion-proof valve of this utility model has normal explosion-proof function compared with existing explosion-proof valves. It can meet the waterproof and breathable requirements of the equipment 30. Under the premise that the equipment 30 can withstand a certain negative pressure, it can keep the diaphragm assembly 20 sealed and isolated from the external environment for most of the service life of the equipment 30 and the explosion-proof valve, which significantly reduces the moisture entering the inner cavity 113 and the inside of the equipment 30. Even if there is a humidity gradient between the equipment 30 and the external environment, water vapor in the external environment cannot flow into the inside of the equipment 30 through the diaphragm assembly 20, thus protecting the diaphragm assembly 20 and the equipment 30.

[0092] like Figure 3 In the first embodiment shown, the diaphragm assembly 20 is fixedly connected to the housing assembly 10, and the housing assembly 10 is fixed to the outer periphery of the vent 31 of the device 30, thereby sealing and covering the vent 31 with the diaphragm assembly 20. Specifically, the housing assembly 10 includes a fixing bracket 17 located inside the body 11 for fixing the diaphragm assembly 20. The outer periphery of the fixing bracket 17 is sealed and connected to the inner wall of the body 11. The fixing bracket 17 has a vent hole 171 communicating with the vent 31. The diaphragm assembly 20 is sealed and fixed on the fixing bracket 17 and covers the vent hole 171 to seal and cover the vent 31.

[0093] The fixed bracket 17 can be integrated with the body 11. The diaphragm assembly 20 is sealed and fixed to the surface of the fixed bracket 17 by bonding or welding, and covers the vent hole 171. At the same time, the body 11 is sealed and fixed to the outer periphery of the vent 31 by bonding, welding or fasteners and sealing gaskets, so that the diaphragm assembly 20 seals and covers the vent 31 of the device 30. The device 30 realizes gas exchange and depressurization through the diaphragm assembly 20. In the normal state, the cover 13 is movably disposed in the second opening 112 of the body 11 by the reset member 12. The inner cavity 113 of the body 11 is sealed and isolated from the external environment. The device 30 only exchanges gas in the inner cavity 113 and does not exchange with the external environment.

[0094] like Figure 4 In the second embodiment shown, the housing assembly 10 and the diaphragm assembly 20 are separately arranged. The body 11 is sealed and fixed to the outer periphery of the vent 31 by bonding, welding or fasteners and sealing gaskets. The diaphragm assembly 20 directly seals and covers the vent 31 by bonding or welding. The device 30 realizes gas exchange and depressurization through the diaphragm assembly 20. In the normal state, the cover 13 is movably disposed in the second opening 112 of the body 11 by the reset member 12. The inner cavity 113 of the body 11 is sealed and isolated from the external environment. The device 30 only exchanges gas in the inner cavity 113 and does not exchange with the external environment.

[0095] In some embodiments, the housing assembly 10 is provided with a puncture member 14, which is positioned toward the diaphragm assembly 20. The function of the puncture member 14 is to quickly rupture the diaphragm assembly 20 when the pressure difference between the inside and outside of the diaphragm assembly 20 is greater than or equal to the burst pressure difference value, so that the inside of the device 30 is directly connected to the inner cavity 113, thereby achieving rapid pressure relief and explosion prevention.

[0096] In different embodiments, the cover 13 and the reset member 12 have various forms, and the cover 13 can open the second opening 112 by rotating or moving.

[0097] like Figures 3 to 9 In the various embodiments shown, the cover 13 is rotatable in the second opening 112; when the cover 13 rotates relative to the body 11, its axis of rotation is eccentric relative to the center of the cover 13, and the reset member 12 is connected between the cover 13 and the body 11.

[0098] like Figure 3 In the first embodiment shown, the reset component 12 is a torsion bar spring 121. The torsion bar spring 121 is connected to the cover 13 and the body 11 respectively, and is eccentrically set relative to the center of the cover 13, dividing the cover 13 into a first part 133 and a second part 134 with different areas. The elastic modulus of the torsion bar spring 121 and the area difference between the first part 133 and the second part 134 satisfy the following: under the corresponding internal and external pressure difference value of the diaphragm assembly 20, the cover 13 seals the second opening 112, or opens the second opening 112 to the first conductive state, or opens the second opening 112 to the second conductive state.

[0099] Specifically, the two ends of the torsion spring 121 are connected to the body 11, and the middle is connected to the cover 13 through the connector 122. The puncturing element 14 can also be provided on the torsion spring 121. For example, the puncturing element 14 is provided on the side of the torsion spring 121 away from the cover 13, and can also be connected to the cover 13. When the cover 13 is flipped, the puncturing element 14 is closer to the diaphragm assembly 20, which accelerates the bursting of the diaphragm assembly 20. The puncturing element 14 is eccentrically positioned relative to the center of the cover 13, which can balance the weight of the cover 13 and make it easier to maintain balance.

[0100] It should be noted that, based on the orientation of the main body 11, the second opening 112 faces different directions, resulting in different forces on the cover 13. The torsion bar spring 121 also provides preload to maintain the balance of the cover 13, enabling it to seal and cover the second opening 112. Furthermore, the first portion 133 and the second portion 134 have different areas and weights, and the preload of the torsion bar spring 121 and the friction of the sealing element 16 on the edge of the cover 13 can be used to maintain the balance of the cover 13.

[0101] During the flipping process of the cover 13, the torsion spring 121 can also generate torsional force; under the pressure of the same inner cavity 113, the pressure torques on the two areas of the cover 13 are not equal, and the cover 13 has a tendency to flip relative to the body 11. When the pressure difference between the inside and outside of the diaphragm assembly 20 is less than the preset value, the pressure torque on the cover 13 is less than the torsional torque of the torsion spring 121 on the cover, and the cover 13 remains stationary relative to the body 11.

[0102] When the pressure difference between the inside and outside of the diaphragm assembly reaches or exceeds a preset value, but is less than the burst pressure difference value, regardless of whether the pressure in the inner cavity 113 is greater than the external pressure or less than the external pressure, the pressure torque on the cover 13 is greater than the torsional torque of the torsion bar spring 121, and the cover 13 rotates around the rotating shaft 132, opening the second opening 112 to the first conductive state; the difference between the pressure in the inner cavity 113 being greater than the external pressure and the pressure in the inner cavity 113 being less than the external pressure is that the flipping direction of the cover 13 is opposite;

[0103] When the pressure difference between the inside and outside of the diaphragm assembly 20 is greater than or equal to the burst pressure difference, the diaphragm assembly 20 bursts rapidly. The pressure torque on the cover 13 is much greater than the torque of the torsion bar spring 121. The cover 13 flips rapidly, opening the second opening 112 to the second conduction state. At this time, the torque of the torsion bar spring 121 is even greater. When the pressure in the inner cavity 113 drops, the pressure torque on the cover 13 is less than the torque of the torsion bar spring 121. The cover 13 flips in the opposite direction to the body 11 to return to the initial position and seal the second opening 112.

[0104] Preferably, a sealing element 16 is provided at the second opening 112. When the pressure difference between the inside and outside of the diaphragm assembly 20 is less than a preset value, the cover 13, under the action of the reset member 12, abuts against the sealing element 16 on its side, thereby sealing the second opening 112.

[0105] The function of the seal 16 is to improve the sealing performance of the cover 13 to the second opening 112 and also to improve the stability of the cover 13 to the second opening 112. When the cover 13 is flipped, one edge of the cover 13 protrudes out of the inner cavity 113 of the body 11, and the other edge enters the inner cavity 113 of the body 11. The edge that enters the inner cavity 113 of the body 11 will squeeze the seal 16. Therefore, the side of the cover 13 abuts against the inner side of the seal 16 to achieve a side seal, thereby reducing the squeezing of the seal 16 by the cover 13 during the flipping process, reducing the interference of the seal 16 on the cover 13, and making the seal 16 easier to flip.

[0106] like Figure 3As shown, in this embodiment, the diaphragm assembly 20 includes a waterproof and breathable membrane 21 and an elastic membrane 22 that deforms under pressure. The elastic membrane 22 is circular and corresponds to the central area of ​​the vent 31. The waterproof and breathable membrane 21 is annular and surrounds the outer side of the elastic membrane 22, resulting in a more compact structure and facilitating miniaturization. The elastic membrane 22 can burst on its own or burst in conjunction with the puncture device 14. Of course, in other embodiments, the diaphragm assembly 20 may be a single waterproof and breathable membrane 21 that can burst in conjunction with the puncture device 14. The elastic membrane 22 may be, for example, a silicone membrane or a PU membrane, and the waterproof and breathable membrane 21 may be a PTFE microporous membrane.

[0107] like Figures 5 to 9 The difference between Embodiment 3 and Embodiment 1 is that the cover 13 includes a plate portion 131 adapted to the shape of the second opening 112 and a rotating shaft 132 fixedly connected to the plate portion 131. The rotating shaft 132 is rotatably connected to the body 11 and is eccentrically positioned relative to the center of the plate portion 131, dividing the plate portion 131 into a first portion 133 and a second portion 134 with unequal areas. The reset member 12 is a torsion spring 123 fixedly sleeved on the rotating shaft 132 and connected to the body 11. The elastic modulus of the torsion spring 123 and the area difference between the first portion 133 and the second portion 134 satisfy the following: under the corresponding internal and external pressure difference value of the diaphragm assembly 20, the cover 13 seals the second opening 112, or opens the second opening 112 to the first conductive state, or opens the second opening 112 to the second conductive state. Figure 5 and Figure 6 As shown, a torsion spring 123 is fixedly sleeved on each end of the rotating shaft 132. The two ends of the rotating shaft 132 and the torsion spring 123 extend into the mounting holes 114 on the body 11. The mounting holes 114 are also provided with limiting grooves 115 for fixing the ends of the torsion spring 123. The two ends of the rotating shaft 132 are located in the mounting holes 114, and the ends of the torsion spring 123 are located in the limiting grooves 115. When the rotating shaft 132 rotates under the action of the plate 131, it drives the main body of the torsion spring 123 to twist and store force. When the resultant torque of the pressure of the inner cavity 113 and the external pressure on the plate 131 is less than the torsional torque of the torsion spring 123, the torsion spring 123 drives the rotating shaft 132 and the plate 131 to return to their original positions.

[0108] Specifically, under the pressure of the same inner cavity 113, the pressure torques on the two regions of the plate 131 are not equal, and the plate 131 tends to flip relative to the body 11. When the pressure difference between the inside and outside of the diaphragm assembly 20 is less than a preset value, the pressure torque on the plate 131 is less than the torque of the torsion spring 123 on the rotating shaft 132, and the cover 13 remains stationary relative to the body 11; when the pressure difference between the inside and outside of the diaphragm assembly 20 is greater than or equal to the preset value and less than the burst pressure difference, regardless of whether the pressure in the inner cavity 113 is greater than or less than the external pressure, the pressure torque on the plate 131 is greater than the torque of the torsion spring 123 on the rotating shaft 132, and the plate 131 rotates around the rotating shaft 132, opening the second opening 112 to the first conductive state; the pressure in the inner cavity 113... The difference between the pressure being greater than the external pressure and the pressure in the inner cavity 113 being less than the external pressure lies in the opposite flipping direction of the plate 131. When the pressure difference between the inside and outside of the diaphragm assembly 20 is greater than or equal to the burst pressure difference, the pressure torque on the plate 131 is much greater than the torque torque of the torsion spring 123 on the rotating shaft, and the plate 131 flips rapidly, opening the second opening 112 to the second conduction state. When the pressure in the inner cavity 113 drops, the pressure torque on the plate 131 is less than the torque torque of the torsion spring 123 on the rotating shaft 132, and the plate 131 flips in the opposite direction relative to the body 11 to return to the initial position, sealing the second opening 112.

[0109] Similarly, based on the orientation of the main body 11, the second opening 112 faces different directions, resulting in different forces on the cover 13. The torsion spring 123 also provides preload to maintain the balance of the cover 13, enabling it to seal and cover the second opening 112. Furthermore, the first portion 133 and the second portion 134 have different areas and weights, so the preload of the torsion spring 123 and the friction of the sealing element 16 on the edge of the cover 13 can be used to maintain the balance of the cover 13.

[0110] Preferably, a sealing element 16 is provided at the second opening 112. When the pressure difference between the inside and outside of the diaphragm assembly 20 is less than a preset value, the cover 13, under the action of the reset member 12, abuts against the sealing element 16 on its side, thereby sealing the second opening 112.

[0111] The function of the seal 16 is to improve the sealing performance of the cover 13 to the second opening 112 and also to improve the stability of the cover 13 to the second opening 112. When the cover 13 is flipped, one edge of the cover 13 protrudes out of the inner cavity 113 of the body 11, and the other edge enters the inner cavity 113 of the body 11. The edge that enters the inner cavity 113 of the body 11 will squeeze the seal 16. Therefore, the side of the cover 13 abuts against the inner side of the seal 16 to achieve a side seal, thereby reducing the squeezing of the seal 16 by the cover 13 during the flipping process, reducing the interference of the seal 16 on the cover 13, and making the seal 16 easier to flip.

[0112] like Figure 7 As shown, in this embodiment, the puncture member 14 is directly disposed on the lower surface of the cover 13. The eccentrically disposed puncture member 14 can balance the weight of the cover 13 together with the rotating shaft 132, making it easier to maintain balance. At the same time, when the cover 13 is flipped, the puncture member 14 is closer to the diaphragm assembly 20, accelerating the bursting of the diaphragm assembly 20.

[0113] like Figures 10 to 13 In the fourth embodiment shown, the second opening 112 is opened upwards, and the main body 11 has a fixing member 15. The fixing member 15 is arranged opposite to the cover 13. The reset member 12 is a helical spring 124. One end of the helical spring 124 is connected to the fixing member 15, and the other end is connected to the cover 13. The weight of the cover 13 and the elastic modulus of the helical spring 124 satisfy the following: under the corresponding internal and external pressure difference value of the diaphragm assembly 20, the cover 13 seals the second opening 112, or opens the second opening 112 to the first conductive state, or opens the second opening 112 to the second conductive state.

[0114] The helical spring 124 connects the cover 13 and the body 11, so that the cover 13 tends to seal and cover the second opening 112 of the body 11. Based on the internal and external pressure difference of the diaphragm assembly 20, the distance between the cover 13 and the second opening 112 of the body 11 is different, so that the second opening 112 is kept sealed or opened to the first conduction state or opened to the second conduction state.

[0115] In this embodiment, the second opening 112 is set facing upwards, and the cover 13 can seal and cover the second opening 112 under its own weight. When the cover 13 is stationary, the helical spring 124 does not exert force on the cover 13, but only maintains the connection; the cover 13 can also seal and cover the second opening 112 under the combined force of its own weight and the tension of the helical spring 124.

[0116] Specifically, such as Figure 10 As shown, when the pressure difference between the inside and outside of the diaphragm assembly 20 is less than the preset value, under the combined force of the tension of the reset member 12, the weight of the cover 13, and the pressure generated by the pressure difference between the inside and outside of the cover 13, the cover 13 remains stationary relative to the body 11 and seals the second opening 112.

[0117] When the pressure difference between the inside and outside of the diaphragm assembly 20 is greater than or equal to a preset value but less than the burst pressure difference value, the cover 13 will move relative to the main body to open the second opening 112. Since there are two scenarios—positive pressure and negative pressure in the device 30—the direction of movement of the cover 13 relative to the main body will also differ. Specifically, as follows... Figure 11As shown, when the pressure inside the device 30 rises and exceeds the external pressure, causing the pressure difference between the inside and outside of the diaphragm assembly 20 to exceed a preset value, the pressure inside the cavity 113 is greater than the external pressure, generating an upward force on the cover 13. Based on the combined force of the internal cavity 113 pressure, the external pressure, the force exerted by the reset component 12 on the cover 13, and the gravity of the cover 13, the cover 13 rises upward, opening the second opening 112 to the first conducting state. Gas from the external environment can exchange with the gas in the internal cavity 113, achieving pressure balance between the device 30, the housing assembly, and the external environment. After pressure balance, the cover 13 falls back, resealing the second opening 112 of the body to prevent moisture from entering the device 30. Figure 12 As shown, when the pressure inside the device 30 drops and becomes less than the external pressure, causing the pressure difference between the inside and outside of the diaphragm assembly 20 to exceed a preset value, the pressure inside the cavity 113 is less than the external pressure. Based on the combined force of the internal cavity 113 pressure, the external pressure, the force exerted by the reset member 12 on the cover 13, and the gravity of the cover 13, the cover 13 moves downward into the internal cavity 113, opening the second opening 112 to the first conducting state. The gas in the external environment can exchange with the gas in the internal cavity 113, achieving pressure balance between the device 30, the housing assembly, and the external environment. After pressure balance, the cover 13 rises upward, resealing the second opening of the body. The opening 112 prevents moisture from entering the device 30. In order for the inner cavity 113 to communicate with the outside after the cover 13 enters the inner cavity 113, the size of the cover 13 is smaller than the size of the inner cavity 113, so that there is a gap between the edge of the cover 13 and the wall of the inner cavity 113 to achieve communication. A sealing element can be set in the second opening 112. The sealing element protrudes from the wall of the inner cavity 113. The size of the cover 13 is smaller than the size of the second opening 112. The cover 13 and the sealing element cooperate to seal the second opening 112. In this case, it is preferable that the cover 13 and the sealing element are side-sealed, so that the cover 13 can move more effortlessly in the second opening 112.

[0118] Of course, in the explosion-proof valve provided in Embodiment 4, when the pressure difference between the inside and outside of the diaphragm assembly 20 is less than a preset value, under the action of the reset member 12, the edge of the lower surface of the cover 13 abuts against the seal 16 located at the second opening 112, thereby sealing the second opening 112. The function of the seal 16 is to improve the sealing performance of the cover 13 on the second opening 112. When the equipment is under positive pressure and the pressure difference reaches or exceeds the preset value, the cover 13 is lifted upward, and the cover 13 gradually moves away from the seal 16. The seal 16 will not interfere with the movement of the cover 13, and the cover 13 is easier to lift and fall back. In addition, when the equipment is under negative pressure and the pressure difference reaches or exceeds the preset value, the cover 13 moves downward under the action of the resultant force, exerting a downward squeezing effect on the seal 16, causing the seal 16 to bend and deform downward. Finally, the cover 13 separates from the seal 16, enters the inner cavity 113 and separates from the seal 16, and a certain gap is maintained between the outer edge of the cover 13 and the inner wall of the inner cavity 113.

[0119] like Figure 13 As shown, when the pressure difference between the inside and outside of the diaphragm assembly 20 is greater than or equal to the burst pressure difference, and the pressure in the inner cavity 113 is much greater than the external air pressure, the diaphragm assembly 20 bursts rapidly. The upward force exerted by the pressure in the inner cavity 113 on the cover 13 is much greater than the combined force of the downward pulling force of the reset member 12 on the cover 13 and the weight of the cover 13. The cover 13 rises rapidly, opening the second opening 112 to the second conductive state, allowing the gas inside the device 30 to be quickly discharged to the external environment through the inner cavity 113, thus achieving depressurization. After depressurization is completed, the cover 13 falls under the action of the pulling force of the reset member 12 and the weight of the cover 13, resealing the second opening 112 of the body 11 to prevent oxygen from entering the device 30 and to prevent a secondary explosion.

[0120] In this embodiment, the puncture member 14 is fixedly connected to the body 11. The puncture member 14 is disposed on the side of the fixing member 15 of the body 11 facing the diaphragm assembly 20. The distance between the puncture member 14 and the vent 31 remains unchanged, which can puncture the diaphragm assembly 20 more accurately.

[0121] The above embodiments are merely preferred embodiments of this utility model and should not be construed as limiting the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.

Claims

1. A moisture-proof and explosion-proof valve, comprising a housing assembly and a diaphragm assembly, characterized in that: The diaphragm assembly includes at least a waterproof and breathable membrane for sealing and covering the ventilation openings of the equipment, and is capable of bursting when the pressure difference between its inside and outside reaches or exceeds the burst pressure difference value. The housing assembly includes a body, a reset member and a cover disposed on the body. The body includes an inner cavity and a first opening and a second opening communicating with the inner cavity. The first opening can be sealed and fixed to the outer periphery of the vent. The diaphragm assembly is located in the inner cavity. The second opening is located at one end of the body away from the vent. The cover is connected to the reset member and is movably disposed in the second opening through the reset member. When the pressure difference between the inside and outside of the diaphragm assembly is less than a preset value, the cover seals the second opening under the action of the reset member, and forms a sealed space with the body and the outer surface of the device; When the pressure difference between the inside and outside of the diaphragm assembly reaches or exceeds a preset value, but is less than the burst pressure difference value, the cover opens the second opening to the first conductive state under the action of pressure torque. When the pressure difference between the inside and outside of the diaphragm assembly reaches or exceeds the burst pressure difference value, the cover opens the second opening to the second conduction state under the action of pressure torque; And when the pressure difference between the inside and outside of the diaphragm assembly decreases from a value at or above the preset value to a value below the preset value, the reset member drives the cover to reset and seals the second opening; The opening degree of the second opening in the first conducting state is smaller than that in the second conducting state.

2. The moisture-proof and explosion-proof valve as described in claim 1, characterized in that, The cover is rotatable in the second opening; when the cover rotates relative to the body, its axis of rotation is eccentric relative to the center of the cover, and the reset member is connected between the cover and the body.

3. The moisture-proof and explosion-proof valve as described in claim 2, characterized in that, The cover includes a plate portion adapted to the shape of the second opening and a rotating shaft fixedly connected to the plate portion. The rotating shaft is rotatably connected to the body and is eccentrically positioned relative to the center of the plate portion, dividing the plate portion into a first part and a second part with unequal areas. The reset component is a torsion spring fixedly sleeved on the rotating shaft, and the torsion spring is connected to the body. The elastic modulus of the torsion spring and the area difference between the first and second portions satisfy the following: Under the corresponding internal and external pressure difference value of the diaphragm assembly, the plate portion seals the second opening, or opens the second opening to the first conduction state, or opens the second opening to the second conduction state.

4. The moisture-proof and explosion-proof valve as described in claim 2, characterized in that, The reset component is a torsion bar spring, which is connected to the cover and the body respectively, and is eccentrically set relative to the center of the cover, dividing the cover into a first part and a second part with different areas; The elastic modulus of the torsion bar spring and the area difference between the first and second portions satisfy the following: Under the corresponding internal and external pressure difference value of the diaphragm assembly, the cover seals the second opening, or opens the second opening to the first conductive state, or opens the second opening to the second conductive state.

5. The moisture-proof and explosion-proof valve as described in claim 2, 3, or 4, characterized in that, A seal is provided at the second opening. When the pressure difference between the inside and outside of the diaphragm assembly is less than a preset value, the cover, under the action of the reset member, abuts against the sealing member on its side, thereby sealing the second opening.

6. The moisture-proof and explosion-proof valve as described in claim 1, characterized in that, The second opening faces upwards, and the main body has a fixing member. The fixing member is disposed opposite to the cover. The reset member is a helical spring, one end of which is connected to the fixing member and the other end is connected to the cover. The weight of the cover and the elastic modulus of the helical spring satisfy the following: Under the corresponding internal and external pressure difference value of the diaphragm assembly, the cover seals the second opening, or opens the second opening to the first conductive state, or opens the second opening to the second conductive state.

7. The moisture-proof and explosion-proof valve as described in claim 6, characterized in that, A seal is provided at the second opening. When the pressure difference between the inside and outside of the diaphragm assembly is less than a preset value, the edge of the lower surface of the cover abuts against the sealing element under the action of the reset member, thereby sealing the second opening.

8. The moisture-proof and explosion-proof valve as described in any one of claims 1 to 4, or 6 or 7, characterized in that, The housing assembly is provided with a puncturing element, which is positioned toward the diaphragm assembly; The puncturing element is fixedly connected to the body or to the cover.

9. The moisture-proof and explosion-proof valve as described in any one of claims 1 to 4, or 6 or 7, characterized in that, The housing assembly and the diaphragm assembly are separately disposed, the main body is sealed and fixed to the outer periphery of the vent, and the diaphragm assembly seals and covers the vent; Alternatively, the housing assembly includes a fixing bracket located inside the body for fixing the diaphragm assembly, the outer periphery of the fixing bracket being sealed to the inner wall of the body, the fixing bracket having a vent hole communicating with the vent, and the diaphragm assembly being sealed and fixed to the fixing bracket and covering the vent hole to seal and cover the vent.

10. The moisture-proof and explosion-proof valve as described in any one of claims 1 to 4, or 6 or 7, characterized in that, The membrane assembly is a single waterproof and breathable membrane; or, the membrane assembly includes a waterproof and breathable membrane and an elastic membrane for deformation under pressure, wherein the elastic membrane is circular and corresponds to the central area of ​​the vent, and the waterproof and breathable membrane is annular and surrounds the outer side of the elastic membrane.

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