Explosion-proof valve and sealing device

Abstract

The utility model discloses an explosion-proof valve and a sealing device, and the explosion-proof valve comprises a valve body which comprises a first end and a second end and defines a containing cavity; the separation part is connected with the valve body and separates the containing cavity to form a first mounting cavity and a second mounting cavity, the separation part and the inner wall of the valve body form an air inlet valve port in the first mounting cavity and form an air outlet valve port in the second mounting cavity, and the first mounting cavity is communicated with the first end to form an air inlet end and is communicated with the second end to form an air guide port; the second mounting cavity communicates with the air guide port and communicates with the valve body to form an air outlet end; the first sealing piece is arranged in the first mounting cavity and used for closing the air inlet valve port, and the first sealing piece moves in the first direction relative to the valve body to open the air inlet valve port; the second sealing piece is arranged in the second mounting cavity and used for closing the air outlet valve port, and the second sealing piece moves in the second direction relative to the valve body to open the air outlet valve port; and the breathable film is arranged at the first end and covers the air inlet end. The explosion-proof valve can bidirectionally balance air pressure inside and outside the sealing device and effectively isolate the breathable film from oil.

Description

Technical Field

[0001] The utility model relates to the technical field of explosion-proof valves, in particular to an explosion-proof valve and a sealing device. Background Art

[0002] At present, during operation, sealing devices (such as sealed enclosures of battery packs, oil-cooled motors, etc.) generate heat or the internal air pressure of the sealing device changes due to factors such as altitude. When the pressure difference between the inside and outside of the sealing device exceeds a preset value, if the air pressure inside and outside the sealing device cannot be balanced in time, it may affect the normal operation of the sealing device.

[0003] In related technologies, an explosion-proof valve is often used to balance the air pressure difference between the inside and outside of the sealing device to ensure the stability and safety of the sealing device. When the internal air pressure of the sealing device body is higher than the external air pressure, the explosion-proof valve exhausts air to the outside to reduce the air pressure inside the sealing device. However, for traditional oil-proof and breathable explosion-proof valves, during the circulation of the internal liquid oil and liquid oil gas of the equipment, they will adsorb onto the surface of the waterproof and breathable membrane and solidify, which will seriously affect the air permeability function of the membrane paper. Moreover, when the external air pressure of the sealing device is higher than the internal air pressure, the explosion-proof valve cannot balance the pressure difference between the inside and outside of the sealing device. Summary of the Utility Model

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. For this purpose, the utility model provides an explosion-proof valve that can balance the internal and external air pressures of the sealing device body in both directions, effectively isolate the breathable membrane from the oil, and reduce the influence of the oil on the air permeability function of the breathable membrane.

[0005] The utility model also provides a sealing device with the above explosion-proof valve.

[0006] The explosion-proof valve according to the first aspect embodiment of the utility model is used to balance the internal and external air pressures of the sealing device, and includes:

[0007] A valve body, including opposite first and second ends, and an accommodation cavity is defined inside the valve body;

[0008] A partition portion, connecting the valve body and dividing the accommodation cavity to form a first installation cavity and a second installation cavity. An intake valve port is formed between the partition portion and the inner wall of the valve body in the first installation cavity, and an exhaust valve port is formed in the second installation cavity. The first installation cavity communicates with the first end to form an intake end, and also communicates with the second end to form a gas guiding port; the second installation cavity communicates with the gas guiding port and conducts through the valve body to form an exhaust end, and the exhaust end is located between the first end and the exhaust valve port;

[0009] A first seal, disposed in the first installation cavity and used to close the intake valve port, and the first seal can move relative to the valve body along a first direction to open the intake valve port;

[0010] A second sealing member is disposed in the second installation cavity and is used to close the outlet valve port. The second sealing member can move relative to the valve body along a second direction to open the outlet valve port. The second direction is opposite to the first direction.

[0011] The air-permeable membrane is arranged at the first end and covers the air inlet end.

[0012] The explosion-proof valve according to the embodiment of the utility model has at least the following beneficial effects: when the external air pressure of the sealing device is higher than the internal air pressure, the first seal and the first installation cavity can open the air inlet valve port through the movement of the first seal, thereby introducing gas to balance the air pressure; when the internal air pressure of the sealing device is higher than the external air pressure, the second seal and the second installation cavity can open the air outlet valve port through the movement of the second seal, thereby exhausting gas to balance the air pressure. In this way, two-way conduction of gas is achieved to balance the air pressure inside and outside the sealing device. At the same time, when the internal and external air pressures of the sealing device are balanced, the air inlet valve port and the air outlet valve port are both in a closed state, thereby preventing the circulation of liquid oil and liquid oil gas and adsorbing on the breathable membrane to solidify, thereby reducing the influence of oil on the breathable function of the breathable membrane.

[0013] According to some embodiments of the present invention, the air outlet end is located between the first end and the air outlet valve port.

[0014] According to some embodiments of the utility model, the inner wall of the valve body extends toward the partition portion and forms a first protrusion structure in the first installation cavity, the first protrusion structure is spaced apart from the partition portion to form the intake valve port, and the first sealing member is located on the side of the intake valve port away from the intake end, and abuts against the first protrusion structure and the partition portion.

[0015] According to some embodiments of the present utility model, the first installation cavity includes a first accommodating cavity, the first accommodating cavity is defined between the air inlet valve port and the air guide port, the explosion-proof valve also includes a first elastic member, the first elastic member is connected to the first sealing member, and the first elastic member and the first sealing member are arranged in the first accommodating cavity.

[0016] According to some embodiments of the present invention, the explosion-proof valve also includes a first valve cover, which is located in the first accommodating chamber and connected to the second end. The first valve cover has a through hole, which is connected to the air guide port, and the first elastic member abuts against the first valve cover.

[0017] According to some embodiments of the utility model, the inner wall of the valve body extends toward the partition portion and forms a second protrusion structure in the second installation cavity, the second protrusion structure is spaced apart from the partition portion to form the air outlet valve port, and the second sealing member is located on the side of the air outlet valve port away from the air guide port, and abuts against the second protrusion structure and the partition portion.

[0018] According to some embodiments of the present invention, the explosion-proof valve also includes a second valve cover, which is arranged at the first end and located in the second installation cavity, the second valve cover connects the partition and the inner wall of the valve body, the second installation cavity includes a second accommodating cavity, the second accommodating cavity is defined between the outlet valve port and the second valve cover, and the second sealing member is arranged in the second accommodating cavity.

[0019] According to some embodiments of the present invention, the explosion-proof valve further includes a second elastic member, which is disposed in the second accommodating chamber, one end of the second elastic member is connected to the second sealing member, and the other end abuts against the second valve cover.

[0020] According to some embodiments of the present invention, along the first direction, the air inlet valve port is located between the air outlet valve port and the air guide port.

[0021] According to the second aspect of the present invention, the sealing device comprises:

[0022] a housing defining a cavity having an opening;

[0023] As described in any of the above embodiments of the explosion-proof valve, the first end is connected to the housing, and the air guide port is connected to the opening

[0024] The sealing device according to the embodiment of the utility model has at least the following beneficial effects: the shell can timely import or export gas by connecting the explosion-proof valve to achieve bidirectional balance of internal and external air pressure of the sealing device, so that the sealing device can work normally.

[0025] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention is further described below with reference to the accompanying drawings and embodiments, wherein:

[0027] Figure 1 This is a schematic diagram of an explosion-proof valve in an embodiment of the utility model;

[0028] Figure 2 A schematic diagram of a valve body in an embodiment of the utility model;

[0029] Figure 3 Schematic diagram of the explosion-proof valve in the embodiment of the present utility model;

[0030] Figure 4 In the embodiment of the present utility model Figure 3 Schematic cross-sectional view taken along line A-A;

[0031] Figure 5 Explosion schematic diagram of the explosion-proof valve in the embodiment of the present utility model;

[0032] Figure 6 Explosion schematic diagram of the explosion-proof valve in the embodiment of the present utility model;

[0033] Figure 7 Half-sectional schematic diagram of the explosion-proof valve in the embodiment of the present utility model.

[0034] Reference numerals:

[0035] Valve body 100; first end 110; second end 120; accommodation cavity 130; first installation cavity 131; air inlet end 1311; air guide port 1312; first accommodation cavity 1313; second installation cavity 132; air outlet end 1321; second accommodation cavity 1322; first convex structure 140; second convex structure 150; partition part 200; air inlet valve port 210; air outlet valve port 220; first seal 300; first elastic member 310; second seal 400; second elastic member 410; breathable film 500; first valve cover 600; through hole 610; second valve cover 700; cover body 800. Detailed implementation manners

[0036] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation of the present utility model.

[0037] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as up, down, front, back, left, right, etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present utility model.

[0038] In the description of the present utility model, the meaning of "several" is more than one, the meaning of "multiple" is more than two, and understandings such as "greater than", "less than", "exceeding", etc. do not include the present number, and understandings such as "above", "below", "within", etc. include the present number. If there is a description of "first" and "second", it is only for the purpose of distinguishing technical features and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0039] In the description of the present utility model, unless otherwise clearly defined, words such as "set", "installed", "connected", etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in the present utility model in combination with the specific content of the technical solution.

[0040] In the description of the present utility model, the description with reference to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0041] The embodiment of the present utility model provides an explosion-proof valve. It should be noted that in the embodiment of the present application, the first direction is the direction in which gas is introduced into the explosion-proof valve. In the accompanying drawings, the direction from top to bottom is the first direction, and the second direction is the direction in which gas is exported from the explosion-proof valve. In the accompanying drawings, the direction from bottom to top is the second direction. Among them, the first direction and the second direction are opposite.

[0042] Next, with reference to the accompanying drawings of the specification, describe the explosion-proof valve according to the first aspect embodiment of the present utility model. Refer to Figures 1 to 7 As shown, the embodiment of the present utility model provides an explosion-proof valve for balancing the internal and external air pressures of a sealing device. Since the working environment of the sealing device during operation is a sealed cavity, there will be a pressure difference between the inside and outside of the cavity during operation. Therefore, it is necessary for the explosion-proof valve to conduct gas to balance the internal and external air pressures. The explosion-proof valve includes a valve body 100, a partition portion 200, a first sealing member 300, a second sealing member 400, and a breathable film 500. Among them, refer to Figure 1 and Figure 2 As shown, the valve body 100 includes a first end 110 and a second end 120 that are oppositely arranged, and an accommodation cavity 130 is defined inside the valve body 100. The accommodation cavity 130 communicates with the first end 110 and the second end 120, so that gas can conduct in the accommodation cavity 130 through the first end 110 and the second end 120 to balance the internal and external air pressures of the valve body 100.

[0043] Refer toFigure 2 , Figure 4 and Figure 7 As shown in Figure 2 , Figure 4 and Figure 7 , the partition part 200 is connected to the inner wall of the valve body 100 and divides the accommodation cavity 130 into a first installation cavity 131 and a second installation cavity 132. Among them, an air inlet valve port 210 is formed between the partition part 200 and the inner wall of the valve body 100 in the first installation cavity 131, and the air inlet valve port 210 is used to conduct the gas entering the accommodation cavity 130 from the external environment. At the same time, an air outlet valve port 220 is formed between the partition part 200 and the inner wall of the valve body 100 in the second installation cavity 132, and the air outlet valve port 220 is used to conduct the gas that needs to be exported from the accommodation cavity 130. The first installation cavity 131 communicates with the first end 110 of the valve body 100 to form an air inlet end 1311, and the first installation cavity 131 communicates with the second end 120 of the valve body 100 to form an air guiding port 1312. After the gas enters the accommodation cavity 130 from the outside through the air inlet end 1311, the gas will be conducted to the air guiding port 1312 through the air inlet valve port 210. The second installation cavity 132 communicates with the air guiding port 1312, and, as Figure 4 shown in Figure 4 , the second installation cavity 132 communicates with the wall of the valve body 100 to form an air outlet end 1321. After the gas enters the accommodation cavity 130 from the cavity of the sealing device through the air guiding port 1312, the gas will be conducted to the air outlet end 1321 through the air outlet valve port 220.

[0044] Referring to Figures 4 to 7 as shown in Figures 4 to 7 , the first seal 300 is arranged in the first installation cavity 131. The first seal 300 is used to close the air inlet valve port 210, and the first seal 300 can move relative to the valve body 100 in the first direction to open the air inlet valve port 210. The second seal 400 is arranged in the second installation cavity 132. The second seal 400 is used to close the air outlet valve port 220, and the second seal 400 can move relative to the valve body 100 in the second direction to open the air outlet valve port 220. The breathable film 500 is arranged at the first end 110, and the breathable film 500 covers the air inlet end 1311. The breathable film 500 is a waterproof and breathable film. When the gas enters the accommodation cavity 130 through the air inlet end 1311, the breathable film 500 is used to isolate the liquid, and the gas can pass through. And the breathable film 500 will filter the gas to reduce the impurities in the air from entering the accommodation cavity 130.

[0045] Specifically, when the external air pressure of the sealing device is higher than the internal air pressure, the external gas will be introduced into the accommodation chamber 130 through the air inlet end 1311. The first seal 300 will move relative to the valve body 100 in the first direction under the action of the air pressure to open the air inlet valve port 210. At this time, the second seal 400 is still in the state of closing the air outlet valve port 220. The gas entering the accommodation chamber 130 will pass through the air inlet valve port 210 and conduct to the air guide port 1312, so as to enter the sealing device to increase the air pressure of the sealing device and make the internal and external air pressures of the sealing device return to balance. When the internal air pressure of the sealing device is higher than the external air pressure, the gas in the sealing device will be introduced into the valve body 100 through the air guide port 1312. The second seal 400 will move relative to the valve body 100 under the action of the air pressure to open the air outlet valve port 220. At this time, the first seal 300 is in the state of closing the air inlet valve port 210. The gas entering the accommodation chamber 130 will pass through the air outlet valve port 220 and conduct to the air outlet end 1321 to discharge the accommodation chamber 130, so as to reduce the air pressure of the sealing device and make the internal and external air pressures of the sealing device return to balance.

[0046] Meanwhile, when the internal and external air pressures of the sealing device are balanced, the first seal 300 will close the air inlet valve port 210, and the second seal 400 will also close the air outlet valve port 220. At this time, the explosion-proof valve will not exchange gas with the outside world, and the explosion-proof valve can prevent liquid oil and liquid oil gas from circulating and adsorbing on the breathable membrane 500 through the first seal 300 and the second seal 400, reducing the contact between the breathable membrane 500 and liquid oil and liquid oil gas, and avoiding the solidification of liquid oil and liquid oil gas on the surface of the breathable membrane 500 and seriously affecting the air permeability function of the breathable membrane 500.

[0047] In some embodiments, referring to Figure 4 As shown, the air outlet end 1321 is located between the first end 110 and the air outlet valve port 220. In this embodiment, the air outlet end 1321 is formed by the side wall of the second installation chamber 132 conducting the explosion-proof valve, so that the air outlet end 1321 is located between the first end 110 and the air outlet valve port 220. Since the air outlet end 1321 is located between the first end 110 and the air outlet valve port 220, and the breathable membrane 500 is arranged at the first end 110, most of the oil and gas will be led out to the outside from the air outlet end 1321 during the process of leading out the gas, thus reducing the contact between the breathable membrane 500 and the vaporized oil and gas, and further reducing the influence of the oil and gas on the air permeability function of the breathable membrane 500. In the traditional explosion-proof valve, the breathable membrane 500 is arranged at the air outlet end 1321, resulting in the attachment of the oil and gas on the breathable membrane 500 when being led out, which will affect the air permeability of the breathable membrane 500 after a long time of use. Compared with the traditional explosion-proof valve, this embodiment can reduce the contact between the breathable membrane 500 and the oil and gas and reduce the influence of the oil and gas on the air permeability function of the breathable membrane 500.

[0048] In other embodiments, the air outlet end 1321 can also reduce the contact between the oil and gas and the breathable membrane 500 through other settings. For example, the air outlet end 1321 is formed by connecting the first end 110 of the explosion-proof valve to the second installation cavity 132. A lead-out pipe is arranged between the breathable membrane 500 and the air outlet end 1321. The breathable membrane 500 is provided with a lead-out hole, and the lead-out pipe passes through the lead-out hole. One end of the lead-out pipe communicates with the outside, and the other end is connected to the air outlet end 1321. The gas can be directly led out to the outside through the lead-out pipe, thereby also reducing the contact between the oil and gas and the breathable membrane 500.

[0049] In some embodiments, referring to Figure 4 As shown, a first convex structure 140 is formed on the inner wall of the valve body 100 extending towards the partition portion 200. The first convex structure 140 is located in the first installation cavity 131. The first convex structure 140 and the partition portion 200 are arranged at intervals to form an intake valve port 210. The first seal 300 is located on the side of the intake valve port 210 away from the intake end 1311, and the first seal 300 abuts against the first convex structure 140 and the partition portion 200. Specifically, the first convex structure 140 and the partition portion 200 jointly define the intake valve port 210, and the first seal 300 abuts against the first convex structure 140 and the partition portion 200 to close the intake valve port 210. Since the gas enters from the intake end 1311, the first seal 300 is arranged on the side of the intake valve port 210 away from the intake end 1311, that is, the side where the intake valve port 210 faces the air guide port 1312, so that the first seal 300 can move towards the air guide port 1312 when subjected to the pressure of the gas, and separate from the first convex structure 140 and the partition portion 200 to open the intake valve port 210, and the gas can thus be conducted to the air guide port 1312 through the intake valve port 210.

[0050] In some embodiments, referring to Figures 4 to 6As shown, the first installation cavity 131 includes a first accommodation cavity 1313, the first accommodation cavity 1313 is defined between the intake valve port 210 and the air guide port 1312. The explosion-proof valve further includes a first elastic member 310, the first elastic member 310 is connected to the first seal 300, and the first elastic member 310 and the first seal 300 are disposed in the first accommodation cavity 1313. Specifically, the first installation cavity 131 includes a first accommodation cavity 1313, and the first accommodation cavity 1313 is the cavity between the intake valve port 210 and the air guide port 1312. The first accommodation cavity 1313 is used to accommodate the first elastic member 310 and the first seal 300, and provide a space for the first elastic member 310 and the first seal 300 to move. When the external air pressure is greater than the air pressure in the accommodation cavity 130, and the air pressure applied to the first seal 300 by the gas is greater than the supporting force applied to the first seal 300 by the first elastic member 310, the first seal 300 will squeeze the first elastic member 310 under the action of the air pressure to open the intake valve port 210. When the external air pressure and the air pressure in the accommodation cavity 130 gradually return to balance, the pressure acting on the first seal 300 will be less than the supporting force acting on the first seal 300. At this time, the first elastic member 310 will gradually return to its initial state, causing the first seal 300 to close the intake valve port 210 again. In this embodiment, the first elastic member 310 abuts against the first seal 300. In other embodiments, the first elastic member 310 may be integrally formed with the first seal 300, or connected to the first seal 300 by bonding or other means.

[0051] In some embodiments, referring to Figures 4 to 6 As shown, the explosion-proof valve further includes a first valve cover 600. The first valve cover 600 is located in the first accommodation cavity 1313, and the first valve cover 600 is connected to the second end 120. The first valve cover 600 has a through hole 610, and the through hole 610 communicates with the air guide port 1312. The first elastic member 310 abuts against the first valve cover 600. Specifically, one end of the first elastic member 310 is connected to the first seal 300, and the other end abuts against the first valve cover 600. The first valve cover 600 provides support for the first elastic member 310, so that the first elastic member 310 will not be displaced when being squeezed by the first seal 300. The through hole 610 penetrates through the first valve cover 600. When the first valve cover 600 is connected to the second end 120, the through hole 610 will communicate with the air guide port 1312, and the gas can pass through the through hole 610 to achieve normal conduction.

[0052] In some embodiments, referring to Figure 4As shown, the inner wall of the valve body 100 extends towards the partition portion 200 and a second convex structure 150 is formed in the second installation cavity 132. The second convex structure 150 is spaced apart from the partition portion 200 to form an air outlet valve port 220. The second seal 400 is located on the side of the air outlet valve port 220 away from the air guide port 1312 and abuts against the second convex structure 150 and the partition portion 200. Specifically, the second convex structure 150 and the partition portion 200 jointly define the air outlet valve port 220, and the second seal 400 abuts against the second convex structure 150 and the partition portion 200 to close the air outlet valve port 220. When discharging gas, since the gas enters the accommodation cavity 130 from the air guide port 1312, the second seal 400 is arranged on the side of the air outlet valve port 220 away from the air guide port 1312, that is, the second seal 400 is arranged on the side of the air outlet valve port 220 facing the first end 110 of the valve body 100, so that the second seal 400 can move towards the direction of the first end 110 when subjected to the pressure of the gas, and separate from the second convex structure 150 and the partition portion 200 to open the air outlet valve port 220, and the gas can thus be conducted to the air outlet end 1321 through the air outlet valve port 220, thereby completing the discharge of the gas.

[0053] In some embodiments, referring to Figures 4 to 6 As shown, the explosion-proof valve further includes a second valve cover 700. The second valve cover 700 is provided at the first end 110 and is located in the second installation cavity 132. The second valve cover 700 connects the partition portion 200 and the inner wall of the valve body 100. The second installation cavity 132 includes a second accommodation cavity 1322 which is defined between the air outlet valve port 220 and the second valve cover 700. The second seal 400 is arranged in the second accommodation cavity 1322. Specifically, the second installation cavity 132 includes a second accommodation cavity 1322 which is the cavity between the air outlet valve port 220 and the second valve cover 700. The second seal 400 is arranged in the second accommodation cavity 1322, and the second accommodation cavity 1322 provides a moving space for the second seal 400.

[0054] In some embodiments, referring to Figures 4 to 6As shown, the explosion-proof valve further includes a second elastic member 410. The second elastic member 410 is disposed in the second accommodation cavity 1322. One end of the second elastic member 410 is connected to the second seal member 400, and the other end abuts against the second valve cover 700. Specifically, when the air pressure in the accommodation cavity 130 is greater than the external air pressure, and the pressure exerted by the gas on the second seal member 400 is greater than the elastic force exerted by the second elastic member 410 on the second seal member 400, the second seal member 400 will squeeze the second elastic member 410 under the action of the air pressure to open the air outlet valve port 220. When the external air pressure and the air pressure in the accommodation cavity 130 gradually return to balance, the gas pressure acting on the second seal member 400 will be less than the elastic force acting on the second seal member 400. At this time, the second elastic member 410 will gradually return to its initial state, causing the second seal member 400 to close the air outlet valve port 220 again. The second valve cover 700 provides support for the second elastic member 410, so that the second elastic member 410 will not be displaced when being squeezed by the second seal member 400. In this embodiment, the second elastic member 410 abuts against the second seal member 400. In other embodiments, the second elastic member 410 may be integrally formed with the second seal member 400, or connected to the second seal member 400 by bonding or other means.

[0055] In some embodiments, referring to Figure 4 and Figure 7 As shown, in the first direction, the air inlet valve port 210 is arranged to be located between the air outlet valve port 220 and the air guide port 1312. Specifically, arranging the air inlet valve port 210 between the air outlet valve port 220 and the air guide port 1312 can make the overall structure of the explosion-proof valve distributed along the axial direction of the explosion-proof valve, that is, make the parts of the explosion-proof valve and the gas flow arranged in an up-and-down structure, thereby reducing the radial size of the explosion-proof valve, making the explosion-proof valve have a simpler structure and a smaller volume, which helps to reduce the requirement for the installation space and makes the installation process more convenient.

[0056] In some embodiments, referring to Figures 4 to 7 As shown, the explosion-proof valve further includes a cover body 800. The cover body 800 is connected to the first end 110 of the valve body 100 and covers the breathable film 500. There is a connection gap between the cover body 800 and the valve body 100, and the gas is introduced or exported from the accommodation cavity 130 through the connection gap between the two to achieve the balance of the internal and external air pressures of the valve body 100. In this embodiment, the breathable film 500 abuts against the second end 120 of the valve body 100 and is fixed to the second end 120 through the cover body 800. In other embodiments (not shown in the figure), the explosion-proof valve may not include the cover body 800, and the gas directly enters the accommodation cavity 130 through the breathable film 500, and the breathable film 500 may be fixed to the second end 120 of the valve body 100 by bonding or snap connection.

[0057] The sealing device according to the second aspect embodiment of the present utility model will be described below. The sealing device includes a housing and the explosion-proof valve described in the above embodiment. The housing defines a cavity, and the cavity has an opening. The gas in the cavity is introduced or discharged through the opening to balance the air pressure inside and outside the cavity. The first end 110 of the explosion-proof valve is connected to the housing, and the air guide port 1312 of the explosion-proof valve communicates with the opening of the cavity.

[0058] Specifically, when the external air pressure of the housing is higher than the internal air pressure, the external gas will be introduced into the valve body 100 through the intake end 1311, and the first seal 300 will move relative to the valve body 100 under the drive of the air pressure to open the intake valve port 210, so that the gas can be conducted to the air guide port 1312 and enter the cavity through the air guide port 1312 to increase the air pressure in the cavity. When the internal air pressure of the housing is higher than the external air pressure, the gas in the housing will be introduced into the valve body 100 through the air guide port 1312, and the second seal 400 will move relative to the valve body 100 under the drive of the air pressure to open the air outlet valve port 220, so that the gas can be conducted to the air outlet end 1321 and be discharged to the outside through the air outlet end 1321 to reduce the air pressure in the cavity. At the same time, when the gas is discharged to the outside through the air outlet end 1321, most of the oil-gas mixture flowing with the gas will be discharged to the outside from the air outlet end 1321, thereby reducing the contact between the breathable membrane 500 and the oil-gas mixture during the gas discharge process, avoiding the adsorption of the oil-gas mixture on the breathable membrane 500 and solidification on the surface of the breathable membrane 500, and further reducing the influence of the oil-gas mixture on the air permeability function of the breathable membrane 500.

[0059] As an example, the explosion-proof valve can be applied to a battery pack. The inside of the battery pack has a cavity, and the explosion-proof valve is connected to the battery pack and communicates with the cavity of the battery pack. When the battery pack is working, the air pressure inside the cavity will change. When the external air pressure of the cavity is higher than the internal air pressure of the cavity, the external gas will be introduced into the explosion-proof valve through the intake end 1311 and enter the cavity of the battery pack through the explosion-proof valve to increase the internal air pressure of the cavity; when the internal air pressure of the cavity is higher than the external air pressure of the cavity, the gas in the cavity will be discharged to the explosion-proof valve and discharged to the outside through the air outlet end 1321 of the explosion-proof valve to reduce the internal air pressure in the cavity, so that the battery pack can continue to work normally.

[0060] In this embodiment, the explosion-proof valve is detachably connected to the opening of the cavity by threads. In other embodiments, the explosion-proof valve can also be connected to the opening by snap connection or magnetic attraction connection.

[0061] The embodiments of the present utility model have been described in detail above in conjunction with the accompanying drawings. However, the present utility model is not limited to the above embodiments, and various changes can be made without departing from the gist of the present utility model within the scope of knowledge possessed by those of ordinary skill in the relevant art. In addition, the embodiments of the present utility model and the features in the embodiments can be combined with each other without conflict.

Claims

1. An explosion-proof valve, used for balancing the internal and external air pressures of a sealing device, characterized in that, include: A valve body, comprising a first end and a second end opposite to each other, wherein an accommodating cavity is defined inside the valve body; A partition part, connected to the valve body and dividing the accommodating cavity to form a first installation cavity and a second installation cavity, the partition part and the inner wall of the valve body form an air inlet valve port in the first installation cavity, and an air outlet valve port in the second installation cavity, the first installation cavity is connected to the first end to form an air inlet end, and is connected to the second end to form an air guide port; the second installation cavity is connected to the air guide port, and is connected to the valve body to form an air outlet end; A first sealing member, disposed in the first installation cavity and used to close the air inlet valve port, wherein the first sealing member can move relative to the valve body along a first direction to open the air inlet valve port; A second sealing member is disposed in the second installation cavity and is used to close the outlet valve port. The second sealing member can move relative to the valve body along a second direction to open the outlet valve port. The second direction is opposite to the first direction. The air-permeable membrane is arranged at the first end and covers the air inlet end.

2. The explosion-proof valve according to claim 1, wherein The gas outlet end is located between the first end and the gas outlet valve port.

3. The explosion-proof valve according to claim 1, wherein, The inner wall of the valve body extends toward the partition and forms a first protrusion structure in the first installation cavity. The first protrusion structure is spaced apart from the partition to form the intake valve port. The first sealing member is located on the side of the intake valve port away from the intake end and abuts against the first protrusion structure and the partition.

4. The explosion-proof valve according to claim 3, characterized in that, The first installation cavity includes a first accommodating cavity, which is defined between the air inlet valve port and the air guide port. The explosion-proof valve also includes a first elastic member, which is connected to the first sealing member. The first elastic member and the first sealing member are arranged in the first accommodating cavity.

5. The explosion-proof valve according to claim 4, characterized in that, The explosion-proof valve further includes a first valve cover, which is located in the first accommodating chamber and connected to the second end. The first valve cover has a through hole, which is connected to the air guide port, and the first elastic member abuts against the first valve cover.

6. The explosion-proof valve according to claim 1, characterized in that, The inner wall of the valve body extends toward the partition and forms a second protrusion structure in the second installation cavity. The second protrusion structure is spaced apart from the partition to form the air outlet valve port. The second sealing member is located on the side of the air outlet valve port away from the air guide port and abuts against the second protrusion structure and the partition.

7. The explosion-proof valve according to claim 6, characterized in that, The explosion-proof valve also includes a second valve cover, which is arranged at the first end and located in the second installation cavity, the second valve cover connects the partition and the inner wall of the valve body, the second installation cavity includes a second accommodating cavity, the second accommodating cavity is defined between the outlet valve port and the second valve cover, and the second sealing member is arranged in the second accommodating cavity.

8. The explosion-proof valve according to claim 7, characterized in that, The explosion-proof valve further includes a second elastic member, which is disposed in the second accommodating chamber. One end of the second elastic member is connected to the second sealing member, and the other end of the second elastic member abuts against the second valve cover.

9. The explosion-proof valve according to claim 1, characterized in that, Along the first direction, the air inlet valve port is located between the air outlet valve port and the air guide port.

10. Sealing device, characterized in that, include: a housing defining a cavity having an opening; The explosion-proof valve according to any one of claims 1 to 9, wherein the first end is connected to the housing, and the air guide port communicates with the opening.

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