A bidirectional non-return valve

Abstract

The utility model discloses a kind of two-way check valves, the two-way check valve is mainly constituted by valve body protective cover, valve body, first air passage valve core assembly, second air passage valve core assembly in composition, and breath air-permeable film cooperation constitutes;Valve body in the two-way check valve of this is the basic component of two-way check valve, for carrying other component parts of two-way check valve;The one end of the valve body is open, the other end bottom is provided with valve hole, corresponding valve cavity is formed in inside, for carrying other component parts is arranged;First air passage valve core assembly and second air passage valve core assembly are set through organic mutual nesting, will form mutual nesting inlet, exhaust passage, reduce the space occupancy of valve body, also can realize the one-way check function of inlet and exhaust passage and quick pressure relief function.

Description

Technical Field

[0001] This utility model relates to battery pack explosion-proof valve technology, specifically to a ventilated explosion-proof valve. Background Technology

[0002] Currently, there are many types of explosion-proof valves used to balance the internal and external pressures of battery packs and to provide rapid pressure relief under specific conditions. One example is the multi-functional spring-loaded ventilated explosion-proof valve. In application, when the pressure difference between the internal battery pack and the external environment is small, the valve allows for ventilation through a waterproof and breathable membrane. When the pressure difference is large, the air pressure is rapidly released in one direction through a sealing structure connected to the spring. Simultaneously, while meeting the requirement for high ventilation during thermal runaway, this multi-functional spring-loaded ventilated explosion-proof valve reduces the flow of external moisture into the battery pack by adding a second diaphragm, maximizing condensation within the battery pack to prevent internal short circuits.

[0003] The existing multi-functional spring-type ventilated explosion-proof body is mainly made of plastic injection molding. After assembling the internal sub-components, the air intake and exhaust passages are isolated and separated to achieve unidirectional quantitative balancing of internal and external pressures, as well as rapid pressure relief and explosion functions when the pressure difference is large. The complex structure of multiple internal sub-components in this multi-functional spring-type ventilated explosion-proof design places high demands on the machining accuracy of the sub-components, the assembly sequence, and assembly time. In addition, the separated structure design of the air intake and exhaust passages also occupies a lot of space, which is not conducive to battery packs with strict space requirements.

[0004] Therefore, providing a breathable and explosion-proof solution with a simple and compact structure and small footprint is an urgent problem to be solved in this field. Utility Model Content

[0005] The present invention aims to provide a two-way check valve to solve the problems existing in the composition structure and space occupation of the existing multi-functional spring-type ventilated explosion-proof valve.

[0006] To achieve the above objectives, the present invention provides a bidirectional check valve, comprising a valve body protective cover, a valve body, a first airway valve core assembly, a second airway valve core assembly, and a breathable membrane.

[0007] The breathable membrane is formed with a first breathable zone and a second exhalation breathable zone with different permeability.

[0008] One end of the valve body is open, and a valve hole is provided at the bottom of the other end;

[0009] The first air passage valve core assembly is configured as an elastic and retractable structure and has a first air passage formed inside it. The first air passage valve core assembly is installed in the valve cavity of the valve body. The first air passage penetrates the valve cavity of the valve body. A second air passage is formed between the first air passage valve core assembly and the valve body. An openable first sealing structure is formed between one end of the second air passage and the valve hole.

[0010] The second air passage valve core assembly is configured as an elastic and retractable structure and is integrally installed in one end of the first air passage of the first air passage of the first air passage valve core assembly. A third air passage is formed between the second air passage valve core assembly and the first air passage valve core assembly, which can connect the inner cavity of the first air passage with the outside of the valve body. Under external force, an openable second sealing structure can be formed between the second air passage valve core assembly and the first air passage valve core assembly to isolate the third air passage.

[0011] The breathable membrane is disposed at the open end of the valve body, and the first breathable area and the second exhalation breathable area on it correspond to the other end of the first airway and the other end of the second airway in the first airway valve core assembly, respectively.

[0012] The valve body protective cover is placed on the open end of the valve body, which can limit the breathing membrane and the first airway valve core assembly, and allow the breathing membrane to communicate with the outside of the valve body.

[0013] Furthermore, the first air passage valve core assembly includes an exhaust passage fixing member, an exhaust passage movable member, a first spring, and a first sealing assembly;

[0014] The exhaust channel fixing component is provided with a first exhaust channel, and at least one air hole is opened on the outside of the first exhaust channel. The exhaust channel fixing component is set in the open end of the valve body, and the air hole on it communicates with the valve cavity inside the valve body.

[0015] The movable exhaust channel is provided with a second exhaust channel adapted to the first exhaust channel. The movable exhaust channel is movably placed in the valve cavity of the valve body. One end cooperates with the fixed exhaust channel to form a nested structure, so that the movable exhaust channel can move back and forth axially relative to the fixed exhaust channel. The other end can abut against the bottom of the valve body. The second exhaust channel in the movable exhaust channel is connected with the first exhaust channel in the fixed exhaust channel to form a first air passage. The outer walls of the fixed exhaust channel and the movable exhaust channel are connected with the inner wall of the valve cavity of the valve body to form a second air passage.

[0016] A first sealing assembly is provided between the movable part of the exhaust channel and the bottom of the valve body; a first spring is provided between the movable part of the exhaust channel and the fixed part of the exhaust channel, and the first spring is configured to drive the movable part of the exhaust channel to maintain contact with the bottom of the valve body and press the first sealing assembly to form a first sealing structure between the inner cavity of the valve body and the valve hole.

[0017] Furthermore, the exhaust channel fixing component or the exhaust channel movable component is injection molded.

[0018] Furthermore, the second air passage valve core assembly includes an intake passage fixing member, an intake passage moving member, a second spring, and a second sealing assembly.

[0019] The intake channel fixing component is fixedly installed in the second exhaust channel on the exhaust channel movable component. One end of the intake channel movable component is movably installed in the intake channel fixing component and can move quantitatively relative to the intake channel fixing component along the axial direction, while forming a third air passage between it and the inner wall of the second exhaust channel.

[0020] The second sealing assembly is disposed between the other end of the intake passage movable part and the mating structure of the exhaust passage movable part, and can form a second sealing structure between the mating structures when under pressure;

[0021] The second spring is disposed between the movable part of the air intake channel and the fixed part of the air intake channel, and is configured to drive the movable part of the air intake channel to be in a non-pressure state against the second sealing assembly in the initial state.

[0022] Furthermore, the intake channel fixing component or the intake channel moving component is injection molded.

[0023] Furthermore, the bidirectional check valve also includes a drain valve, which is disposed on the valve body and forms a one-way passage with the second air passage inside the valve body.

[0024] Furthermore, the drain valve includes a drain valve bracket and a one-way drain valve. The drain valve bracket is embedded in the side wall of the valve body, forming a drain channel that connects to the second air passage inside the valve body. The one-way drain valve is placed in the drain channel.

[0025] Furthermore, the breathable membrane is an e-PTFE breathable membrane.

[0026] Furthermore, the valve body protective cover or valve body is injection molded.

[0027] The solution of this utility model has the following advantages over the prior art:

[0028] (1) This solution combines the intake and exhaust channels into one through innovative structural design, which reduces the space occupied by the valve body, while also satisfying the one-way backflow prevention function and rapid pressure relief function of the intake and exhaust channels.

[0029] (2) This solution sets up a unique drainage channel, which allows the condensate accumulated in the valve body to be discharged through the channel, thereby maximizing the improvement of the condensation phenomenon of the battery pack and preventing the occurrence of short circuits inside the battery pack.

[0030] (3) The components of this solution are mainly processed by plastic injection molding, and the overall structure is simple and the manufacturing cost is low. Attached Figure Description

[0031] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0032] Figure 1 This is a cross-sectional view of the bidirectional check valve in this utility model;

[0033] Figure 2 This is an example diagram of the explosion of the bidirectional check valve in this utility model;

[0034] Figure 3 This is a structural example diagram of the valve body in this utility model;

[0035] Figure 4 This is a structural example diagram of the valve body protective cover in this utility model;

[0036] Figure 5 This is a structural example diagram of the exhaust channel fixing component in this utility model;

[0037] Figure 6 This is a structural example diagram of the air intake channel fixing component in this utility model;

[0038] Figure 7 This is a structural example diagram of the movable component of the air intake channel in this utility model;

[0039] Figure 8 This is an example diagram illustrating the structure of the breathable membrane in this utility model;

[0040] Figure 9 This is an example diagram illustrating the structure of the drain valve in this utility model;

[0041] Figure 10 This is an example diagram showing the bidirectional check valve in the open air intake channel state in this utility model;

[0042] Figure 11 This is an example diagram showing the bidirectional check valve in the open exhaust channel state in this utility model;

[0043] Figure 12This is an example diagram showing the bidirectional check valve in the open state of the condensate discharge channel in this utility model. Detailed Implementation

[0044] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the following description, in conjunction with specific illustrations, further elaborates on this utility model.

[0045] See Figure 1 and Figure 2 The cross-sectional structure and exploded structure of the bidirectional check valve in this utility model are given respectively.

[0046] Based on the illustrated structure, the bidirectional check valve provided by this utility model is mainly composed of a valve body protective cover 100, a valve body 200, a first airway valve core assembly 300, a second airway valve core assembly 400, and a breathing membrane 500 working together.

[0047] The valve body 200 in this bidirectional check valve serves as the basic component, supporting the other components of the check valve. One end of the valve body 200 is open, and the bottom of the other end has a valve hole, with a corresponding valve cavity formed inside to support and house the other components.

[0048] In this bidirectional check valve, the first air passage valve core assembly 300 and the second air passage valve core assembly 400 are organically nested together to form nested intake and exhaust channels (i.e., the intake and exhaust channels are combined into one), which reduces the space occupied by the valve body and can also realize the one-way check function of the intake and exhaust channels as well as the rapid pressure relief function.

[0049] Specifically, the first air passage valve core assembly 300 in this bidirectional check valve is configured as an elastic and retractable structure, and a first air passage 310 is formed inside it. The first air passage valve core assembly 300 is installed in the valve cavity of the valve body 200, and the first air passage 310 penetrates the valve cavity of the valve body. At the same time, a second air passage 320 is formed between the first air passage valve core assembly 300 and the valve body 200.

[0050] Furthermore, the first air passage valve core assembly 300, through its own expansion and contraction, can form an openable first sealing structure at the corresponding mating structure between the first air passage valve core assembly 300 and the valve body 200, specifically between one end of the second air passage 320 and the valve hole. This first sealing structure can effectively isolate the communication between one end of the second air passage 320 and the valve body. Simultaneously, the sealing state of this first sealing structure can change back and forth between an open state and a sealed state as the first air passage valve core assembly 300 expands and contracts. Based on this, the sealing state of the first sealing structure can be controlled by controlling the expansion and contraction of the first air passage valve core assembly 300, thereby controlling the opening or closing state of one end of the second air passage 320.

[0051] Here, it is preferable to form an openable first sealing structure between one end of the second air passage 320 and the valve hole based on the elasticity formed by the first air passage valve core assembly 300 itself, and control the sealing state of the first sealing structure (i.e., control the expansion and contraction state of the first air passage valve core assembly 300 based on the elasticity formed by itself in conjunction with the external force). The formed elasticity will serve as a stable first valve opening force.

[0052] Correspondingly, the second air passage valve core assembly 400 in this bidirectional check valve is also configured as an elastic and retractable structure, and is integrally installed in one end of the first air passage 310 of the first air passage valve core assembly 300, forming a third air passage 410 between the second air passage valve core assembly 400 and the first air passage valve core assembly 300, which can connect the inner cavity of the first air passage 310 with the outside of the valve body.

[0053] Furthermore, the second air passage valve core assembly 400, through its own expansion and contraction, can form an openable second sealing structure at the corresponding mating structure between the second air passage valve core assembly 400 and the first air passage valve core assembly 300. This second sealing structure can effectively isolate one end of the third air passage 410 from the valve body, and the sealing state of the second sealing structure can change back and forth between the open and sealed states as the second air passage valve core assembly 400 expands and contracts. Based on this, the sealing state of the second sealing structure can be controlled by controlling the expansion and contraction of the second air passage valve core assembly 400, thereby controlling the opening or closing state of one end of the third air passage 410, and further controlling the communication state between the first air passage 310 and the valve body.

[0054] Here, it is preferable to form an openable second sealing structure at the corresponding mating structure between the second airway valve core assembly 400 and the first airway valve core assembly 300 based on the elasticity formed by the second airway valve core assembly 400 itself, and control the sealing state of the second sealing structure (i.e., control the expansion and contraction state of the second airway valve core assembly 400 based on the elasticity formed by itself in conjunction with external force). The formed elasticity will serve as a stable second valve opening force.

[0055] In this bidirectional check valve, the breathable membrane 500 is adapted to the open end of the valve body, forming a first breathable region and a second exhalation region with different permeability. This breathable membrane 500, with this structure, is positioned at the open end of the valve body, and its first breathable region and second exhalation region respectively cover the other ends of the first airway 310 and the second airway 320 in the first airway valve core assembly.

[0056] In this bidirectional check valve, the valve body protective cover 100 is placed on the open end of the valve body 200, which can limit the breathing membrane 500 and the first airway valve core assembly 300, so that the first airway valve core assembly 300 is limited and fixed inside the valve body 200, and at the same time, the breathing membrane 500 is fixedly covered on the first airway valve core assembly 300, and the breathing membrane 500 can communicate with the outside of the valve body. Thus, the other end of the first airway 310 and the other end of the second airway 320 in the first airway valve core assembly can respectively communicate with the outside from the other end of the valve body through the breathing membrane 500.

[0057] Regarding the bidirectional check valve solution provided by this utility model, the following examples will specifically illustrate the composition and operation of each component of the bidirectional check valve.

[0058] See Figure 3 The diagram shows an example of the structure of the valve body 200 in this example.

[0059] Based on the illustration, the valve body 200 is mainly formed by combining a cylindrical main body 210 and mounting plate parts 220 distributed on both sides of the cylindrical main body 210.

[0060] The cylindrical main body 210 of the valve body 200 is open at one end, and the bottom of the other end is formed with a corresponding countersunk hole as a valve hole 230. A corresponding valve cavity 240 is formed inside to accommodate the first air passage valve core assembly 300.

[0061] The valve body 200 has several slots 250 at its open end, which are used to form the same air passage between the valve body 200 and the valve body protective cover 100 when the valve body 200 and the valve body protective cover 100 are connected, so as to realize the communication between the internal components of the valve body 200 and the outside.

[0062] Furthermore, a drain hole 260 is provided on the side wall of the valve body 200. The drain hole 260 is connected to the valve cavity 240 inside the valve body 200 and is used to house the corresponding drain valve 600.

[0063] Furthermore, the bottom end of the valve body 200 (the end opposite to the open end) serves as a mounting end for connecting and fixing with a component to be mated (such as a battery pack). An annular sealing groove 270 is formed on the end face of this bottom end. This annular sealing groove 270 is distributed around the valve hole 230, and a corresponding valve body sealing ring 280 is disposed within the sealing groove to form a seal on the mounting surface of the valve body 200 (such as...). Figure 1 (As shown). In this way, when the valve body 200 is connected and fixed to the corresponding mating component (such as a battery pack), a sealing structure distributed around the valve hole 230 will be formed between the mating surfaces of the two.

[0064] In this example, the valve body 200 is preferably formed by one-time injection molding of plastic, which can ensure the accuracy of the structure and reduce costs.

[0065] For the valve body sealing ring 280, rubber vulcanization molding is preferred.

[0066] See Figure 4 The diagram shows an example of the configuration of the valve body protective cover 100 in this example.

[0067] Based on the illustration, the valve body protective cover 100 is a cylindrical cover structure adapted to the valve body 200, which can cover the open end of the valve body 200 to limit, fix and protect the components installed in the valve body 200.

[0068] Specifically, the valve body protective cover 100 has a downwardly extending flange structure 110 around its perimeter. The inner side of the flange has several snap-fit ​​or threaded holes evenly distributed for tight connection with the valve body.

[0069] It should be noted that the specific structural form of the valve body protective cover 100 and its connection and mating structure with the valve body 200 are not limited to this; other structural forms may be adopted as needed.

[0070] In this example, the valve body protective cover 100 is preferably formed by one-time injection molding of plastic, which can ensure the accuracy of the structure and reduce costs.

[0071] Combination Figure 1 and 2As shown, the first air passage valve core assembly 300 in this example is mainly composed of an exhaust passage fixing member 330, an exhaust passage moving member 340, a first spring 350, and a first sealing assembly 360 working together.

[0072] The exhaust passage fixing component 330 is integrally installed in the open end of the valve body 200 and can be fixed in the open end of the valve body 200 under the limit of the valve body protective cover 100, so as to provide reliable support for the exhaust passage moving component 340.

[0073] For details, see Figure 5 As shown, the exhaust channel fixing member 330 in this example is generally annular, including an annular body 331 and a first exhaust channel portion 332 formed in the middle of the annular body 331.

[0074] Here, the overall size of the annular body 331 is adapted to the open end of the valve body 200 so that the exhaust passage fixing member 330 can be installed in the open end of the valve body 200.

[0075] As an example, in order to securely mount it in the open end of the valve body 200, this embodiment preferably has a corresponding mounting groove 335 on the end face of the annular body 331 that mates with the open end of the valve body 200, so as to achieve mounting in the open end of the valve body 200 through an overlapping structure. Figure 1 As shown, it can limit the circumferential rotation of the exhaust passage fixing member 330 relative to the valve body 200.

[0076] It should be noted that the mounting and mating structure between the exhaust channel fixing component 330 and the valve body 200 is not limited to this. Other structural forms, such as snap-fit, screw connection, etc., can be used as needed.

[0077] In this example, several air holes 333 are further provided on the annular body 331 to form a second air passage 320.

[0078] As a priority, a number of vents 333 are distributed around the periphery of the first exhaust channel portion 332 along the circumference of the annular body 331.

[0079] The number and shape of the pores 333 are not limited and can be determined according to actual needs.

[0080] The first exhaust channel portion 332 of the exhaust channel fixing member 330 is formed in the middle of the annular body 331, and a first exhaust channel 334 is formed in the first exhaust channel portion 332, which is used to cooperate with the second exhaust channel 344 in the exhaust channel movable member 340 to form a first air passage 310.

[0081] The exhaust channel fixing member 330 with such structure can be installed in the opening end of the valve body 200 by cooperating with the annular body 331 on it, so that the air hole 333 on it is connected with the valve cavity 240 inside the valve body, and the first exhaust channel part 332 on it extends into the valve cavity 240 inside the valve body.

[0082] As further explanation, in this example, the exhaust channel fastener 330 is preferably molded by one-time injection molding of plastic, which can both ensure the accuracy of the structure and reduce costs.

[0083] The exhaust passage movable part 340 is configured to be movably docked with the exhaust passage fixed part 330, and can move in a direction and quantity relative to the exhaust passage fixed part 330 within the valve body 200 under the guidance of the exhaust passage fixed part 330, forming a retractable moving part in the first air passage valve core assembly; and can simultaneously form the first air passage 310.

[0084] Specifically, the exhaust channel movable component 340 is generally annular, including an annular body 341 and a second exhaust channel portion 342 formed in the middle of the annular body 341.

[0085] Here, the overall dimensions of the annular body 341 are adapted to the countersunk structure (i.e., valve hole 230) at the bottom of the valve body 200 so that the exhaust passage movable part 340 can be placed in the countersunk structure at the bottom of the valve body 200.

[0086] Furthermore, in this example, an annular first sealing groove 343 is formed on the end face of the annular body 341 that abuts against the bottom countersunk structure of the valve body 200, for placing the first sealing assembly 360, for forming a first sealing structure between the mating structure of the annular body 341 and the bottom of the valve body 200.

[0087] The second exhaust channel portion 342 of the exhaust channel movable member 340 is formed in the middle of the annular body 341, and a second exhaust channel 344 is formed in the second exhaust channel portion 342, which is used to cooperate with the first exhaust channel 334 in the exhaust channel fixing member 330 to form a first air passage 310.

[0088] Furthermore, the second exhaust passage portion 342 here is adapted to the first exhaust passage portion 332 in the exhaust passage fixing member 330, so that the second exhaust passage portion 342 is movably inserted into the first exhaust passage portion 332, or the first exhaust passage portion 332 is movably inserted into the second exhaust passage portion 342, thereby enabling the second exhaust passage portion 342 to move axially relative to the first exhaust passage portion 332, forming a retractable moving part in the first air passage valve core assembly; at the same time, the second exhaust passage 344 in the second exhaust passage portion 342 is connected and cooperated with the first exhaust passage 334 in the first exhaust passage portion 332 to form the first air passage 310.

[0089] When the exhaust channel movable component 340 with this structure is assembled with the exhaust channel fixed component 330, it is moved and placed in the valve cavity of the valve body 200 through the abutment of its annular body 341 with the countersunk hole structure at the bottom of the valve body 200. This allows the second exhaust channel portion 342 on the component to form a nested structure with the first exhaust channel portion 332 in the exhaust channel fixed component 330 (either the second exhaust channel portion 342 is movably inserted into the first exhaust channel portion 332, or the first exhaust channel portion 332 is movably inserted into the second exhaust channel portion 342). The exhaust channel fixed component 330 is relatively fixed in the valve body 200, and its first exhaust channel portion 332 can guide and limit the second exhaust channel portion 342. This allows the second exhaust passage portion 342 to move in a directional and quantitative manner along the first exhaust passage portion 332. During the movement, the second exhaust passage portion 342 and the first exhaust passage portion 332 remain nested together, so that the exhaust passage movable member 340 can move back and forth in a directional and quantitative manner relative to the exhaust passage fixed member 330 within the valve body 200 (i.e., forming a telescopic movement). Furthermore, the second exhaust passage 344 in the second exhaust passage portion 342 and the first exhaust passage 334 in the first exhaust passage portion 332 are connected to form a first air passage 310, and the exhaust passage movable member 340 remains connected during the telescopic movement relative to the exhaust passage fixed member 330, thereby forming a first air passage 310 that penetrates the valve cavity 240 of the valve body 200.

[0090] Meanwhile, the outer walls of the nested first exhaust passage portion 332 and the second exhaust passage portion 342 form an annular cavity with the inner wall of the valve cavity 240 inside the valve body. This annular cavity, together with a number of air holes 333 on the exhaust passage fixing member 330 and the gap between the annular body 341 in the second exhaust passage portion 342 and the bottom of the valve body 200, forms a second air passage 320.

[0091] Based on this, the first sealing component 360 on the annular body 341 in the second exhaust passage 342 can form a first sealing structure in the gap between the annular body 341 and the bottom of the valve body 200 when under pressure. This first sealing structure can prevent the bottom end of the formed second air passage 320 from communicating with the outside from the bottom of the valve body 200.

[0092] As further explanation, in this example, the exhaust channel movable part 340 is preferably molded by one-time injection molding of plastic, which can both ensure the accuracy of the structure and reduce costs.

[0093] The first spring 350 in the first air passage valve core assembly 300 serves as an elastic component in the first air passage valve core assembly 300, and is used to provide a stable first valve opening force. The first spring 350 can generate elastic force on the exhaust passage movable member 340, so that the exhaust passage movable member 340 can remain in contact with the bottom of the valve body 200 and press the first sealing assembly 360, thereby forming an openable first sealing structure.

[0094] Specifically, the first spring 350 is integrally sleeved on the mutually nested exhaust channel movable member 340 and exhaust channel fixed member 330, with one end of the first spring 350 abutting against the exhaust channel fixed member 330 and the other end abutting against the exhaust channel movable member 340; at the same time, the first spring 350 is in a pre-compressed state, which can drive the exhaust channel movable member 340 to maintain abutting and cooperating with the bottom of the valve body 200 based on the elastic force, and press the first sealing assembly 260 to form a first sealing structure between the exhaust channel movable member 340 and the bottom of the valve body 200, which can prevent the bottom end of the second air passage 320 from communicating with the outside from the bottom of the valve body 200.

[0095] Based on this, the elastic force generated by the first spring 350 on the exhaust channel movable member 340 will serve as the first valve opening force. When the exhaust channel movable member 340 is subjected to an external force facing the exhaust channel fixed member 330, and this external force is greater than the elastic force generated by the first spring 350 on the exhaust channel movable member 340, it can overcome the elastic force and move towards the exhaust channel fixed member 330. During the movement, it will simultaneously lose pressure on the first sealing assembly 360, thereby causing the sealing state of the first sealing structure to fail and opening the bottom of the second air passage 320. The second air passage 320 is in a state of communication with the outside from the bottom of the valve body 200. When the exhaust passage movable member 340 loses the external force facing the exhaust passage fixed member 330 or the external force is less than the elastic force generated by the first spring 350 on the exhaust passage movable member 340, the exhaust passage movable member 340 will move towards the bottom of the valve body 200 under the elastic force of the first spring 350 and press the first sealing assembly 360, thereby restoring the sealing state of the first sealing structure, which closes the state of communication between the bottom end of the second air passage 320 and the outside from the bottom of the valve body 200.

[0096] The first sealing component 360 in the first air passage valve core assembly 300 is specifically constructed using a corresponding sealing ring. Preferably, it can be made of rubber vulcanization molding.

[0097] Combination Figure 1 and 2 As shown, the second air passage valve core assembly 400 in this example is mainly composed of an air intake passage fixing part 420, an air intake passage moving part 430, a second spring 440, and a second sealing assembly 450.

[0098] The intake passage fixing member 420 is fixedly installed in the second exhaust passage on the exhaust passage movable member 340, while the intake passage movable member 430 is movably connected and cooperates with the intake passage fixing member 420, and can move quantitatively relative to the intake passage fixing member 420 along the axial direction, thereby forming a telescopic movable part on the second air passage valve core assembly 400; at the same time, the intake passage fixing member 420 and the intake passage movable member 430, which are connected and cooperate with each other, form a third air passage 410 between the intake passage fixing member 420 and the inner wall of the second exhaust passage on the exhaust passage movable member 340.

[0099] Based on this, during the extension and retraction of the intake passage movable part 430 relative to the intake passage fixed part 420, it can abut and cooperate with the exhaust passage movable part 340 to cover one end of the third air passage 410.

[0100] The second sealing assembly 450 is disposed between the intake passage movable member 430 and the exhaust passage movable member 340. When the intake passage movable member 430 and the exhaust passage movable member 340 are in contact, they are compressed to form a second sealing structure between them. This second sealing structure can prevent one end of the third air passage 410 from communicating with the outside from the bottom of the valve body 200.

[0101] The second spring 440 is disposed between the movable part 430 of the intake channel and the fixed part 420 of the intake channel, which are connected and cooperate with each other. It is configured to drive the movable part 430 of the intake channel to be in a non-pressure state against the second sealing assembly in the initial state, so that the second sealing structure is in a failed state, and one end of the third air passage 410 remains in communication with the outside of the valve body 200.

[0102] For details, see Figure 6 The diagram illustrates one configuration of the intake channel fixture 420 in this example. The intake channel fixture 420 mainly includes an annular body 421 and a connecting portion 422 formed in the middle of the annular body 421.

[0103] Here, the overall dimensions of the annular body 421 are adapted to the inner diameter of the second exhaust channel on the exhaust channel movable component 340, so that the intake channel fixing component 420 can be installed in the second exhaust channel. When the annular body 421 is installed in the second exhaust channel, it can form a relatively fixed connection structure with the inner wall of the second exhaust channel, so that the intake channel fixing component 420 can be fixedly installed in the second exhaust channel. This relatively fixed connection structure can be a snap-fit ​​connection structure, a screw connection structure, etc.

[0104] As an example, in this example, a plurality of radial protrusions 423 are distributed on the outer edge of the annular body 421. The protrusions 423 are configured to cooperate with the inner wall of the second exhaust channel on the exhaust channel movable member 340 and form a snap-fit ​​structure, so that the intake channel fixing member 420 can be relatively fixedly placed in the second exhaust channel on the exhaust channel movable member 340.

[0105] The connecting part 422 in the intake channel fixing member 420 is formed in the middle of the annular body 421 and is used to connect the intake channel movable member 430, so that the intake channel movable member 430 can move in a directional and quantitative manner relative to the intake channel fixing member 420.

[0106] As an example, to facilitate connection and assembly with the intake channel movable component 430 and provide a certain amount of movable space, this example has several snap-fit ​​holes 424 on the connecting part 422 for forming a snap-fit ​​structure with the intake channel movable component 430 to achieve connection and assembly with the intake channel movable component 430; at the same time, the snap-fit ​​hole 424 is provided with sufficient space in size so that after the intake channel movable component 430 is snapped into the snap-fit ​​hole 424, it can still move in a directional and quantitative manner along the snap-fit ​​hole 424.

[0107] In addition, the snap-fit ​​hole 424 also serves as part of the third air passage 410.

[0108] It should be noted that the specific structural form of the connecting part 422 and the snap-fit ​​hole 424 thereon is not limited, and can be designed and adjusted according to actual needs.

[0109] When the intake channel fixing component 420 with such a structure is assembled, it is directly snapped into the second exhaust channel on the exhaust channel movable component 340 through its annular body 421, and its snap-fit ​​hole 424 will be connected to the second exhaust channel.

[0110] As further explanation, in this example, the intake channel fixing component 420 is preferably molded by one-time plastic injection molding, which can both ensure the accuracy of the structure and reduce costs.

[0111] For details, see Figure 7 The diagram illustrates one configuration of the intake passage movable component 430 in this example. This intake passage movable component 430 mainly includes a circular body 431 and a connecting portion 432 formed in the middle of the circular body 431.

[0112] The circular body 431 here is adapted to the bottom port (bottom port of the second exhaust channel) of the exhaust channel movable part 340, and can abut against the bottom port of the exhaust channel movable part 340, thereby covering the second exhaust channel in the exhaust channel movable part 340.

[0113] Furthermore, the connecting part 432 is formed in the middle of the annular body 341 and is used to engage with the connecting part 422 in the air intake channel fixing member 420.

[0114] As an example, the connecting part 432 here is a hollow cylindrical structure, and its internal structure is adapted to (preferably with clearance fit) the connecting part 422 in the intake channel fixing member 420, allowing the connecting part 422 to be movably inserted therein; at the same time, there are a number of locking teeth 433 on the inner wall, which correspond to the locking holes 424 on the connecting part 422 in the intake channel fixing member 420, so that the connecting part 422 can be inserted into the intake channel fixing member 420. When the air intake passage moves into the connecting part 432, the locking teeth 433 on the inner wall of the connecting part 432 will engage with the locking holes 424 on the connecting part 422, thereby realizing the assembly connection between the air intake passage movable part 430 and the air intake passage fixed part 420. At the same time, the locking teeth 433 engaged in the locking holes 424 can also move back and forth in the locking holes 424 along the extension direction of the locking holes 424, thereby enabling the air intake passage movable part 430 to move in a directional and quantitative manner relative to the air intake passage fixed part 420.

[0115] When the intake passage movable component 430 with this structure is assembled with the intake passage fixed component 420, the intake passage fixed component 420 is pre-assembled in the second exhaust passage on the exhaust passage movable component 340. The intake passage movable component 430 cooperates with the intake passage fixed component 420 through the connecting part 432 on it, so that the connecting part 422 is inserted into the connecting part 432. At the same time, the locking teeth 433 on the inner wall of the connecting part 432 will be engaged into the locking holes 424 on the connecting part 422, thereby realizing the assembly connection between the intake passage movable component 430 and the intake passage fixed component 420.

[0116] Based on this, since the intake channel fixing member 420 is relatively fixedly installed in the exhaust channel movable member 340, the snap-fit ​​hole 424 on its connecting part 422 can limit the movement direction and movement stroke of the snap-fit ​​tooth 433 on the intake channel movable member 430 in the snap-fit ​​hole 424, thereby enabling the intake channel movable member 430 to move in a directional and quantitative manner relative to the intake channel fixing member 420 in the second exhaust channel of the exhaust channel movable member 340, that is, to form a telescopic movement.

[0117] Meanwhile, the outer walls of the interconnected intake channel movable component 430 and intake channel fixed component 420 form an annular cavity with the inner wall of the second exhaust channel of the exhaust channel movable component 340. This annular cavity, together with the snap-fit ​​hole 424 on the intake channel fixed component 420 and the gap between the circular body 431 in the intake channel movable component 430 and the exhaust channel movable component 340, forms a third air passage 410. The third air passage 410 can communicate with the first air passage 310 through the snap-fit ​​hole 424 and communicate with the outside of the valve body 200 through the gap between the circular body 431 and the exhaust channel movable component 340.

[0118] Furthermore, during the movement of the intake passage movable member 430 toward the intake passage fixed member 420, the circular body 431 on it can form an abutment fit with the bottom port of the exhaust passage movable member 340, thereby covering the second exhaust passage in the exhaust passage movable member 340 (and also covering the port of the third air passage 410).

[0119] As further explanation, in this example, the intake channel movable part 430 is preferably formed by one-time injection molding of plastic, which can both ensure the accuracy of the structure and reduce costs.

[0120] In this second air passage valve core assembly 400, the second sealing component 450 is preferably constructed using a sealing ring, and is further preferably disposed between the circular body 431 on the intake passage movable member 430 and the bottom port of the exhaust passage movable member 340. When the circular body 431 and the bottom port of the exhaust passage movable member 340 form an abutting fit, the second sealing structure is formed in the gap between the circular body 431 and the exhaust passage movable member 340 under pressure. This second sealing structure can prevent the third air passage 410 from communicating with the outside of the valve body 200.

[0121] As a further explanation, the second sealing component 450 may preferably be made of rubber vulcanization.

[0122] The second spring 440 in the second air passage valve core assembly 400 serves as an elastic component in the second air passage valve core assembly 400. It is integrally sleeved on the mutually engaging air intake passage movable member 430 and air intake passage fixed member 420. One end of the second spring 440 abuts against the air intake passage fixed member 420, and the other end can abut against the air intake passage movable member 430.

[0123] In its initial state, the second spring 440 can generate an elastic driving force on the intake channel movable member 430 in the opposite direction to the intake channel fixed member 420 based on its elasticity, so that the intake channel movable member 430 remains in a non-pressurized state on the second sealing assembly 450, thereby making the second sealing structure in a failed state, and thus keeping the third air passage 410 in communication with the outside of the valve body 200.

[0124] Based on this, the elastic force generated by the second spring 440 on the intake channel movable member 430 will serve as the second valve opening force. When the intake channel movable member 430 is subjected to an external force facing the intake channel fixed member 420, and the external force is greater than the elastic force generated by the second spring 440 on the intake channel movable member 430, it can overcome the elastic force and make the intake channel movable member 430 move towards the intake channel fixed member 420. During the movement, it will simultaneously press the second sealing component 450 to form a second sealing structure, which will then be able to block the third air passage 410 from communicating with the outside of the valve body 200.

[0125] When the intake passage movable part 430 loses the external force facing the intake passage fixed part 420, or when the external force is less than the elastic force generated by the second spring 440 on the intake passage movable part 430, the intake passage movable part 430 will move away from the intake passage fixed part 420 under the elastic force of the second spring 440, and will simultaneously lose the pressing state on the second sealing assembly 450, thereby causing the second sealing structure to fail and restoring the communication state between the third air passage 410 and the outside of the valve body 200.

[0126] See further Figure 8 The illustration shows an example of the construction of the breathable membrane 500 used in this example. The breathable membrane 500 is preferably made of e-PTFE membrane, and a first breathable region and a second exhalation breathable region with different permeability are formed on the breathable membrane 500.

[0127] Furthermore, the entire breathable membrane 500 is adapted to the exhaust channel fixing member 330, covering the exhaust channel fixing member 330 and forming a corresponding sealing structure at the contact part, so that the first breathing breathable area and the second exhalation breathable area on the breathable membrane 500 respectively cover the first airway 310 and the second airway 320, so that the gas in the first airway 310 and the second airway 320 can only communicate with the outside through the first breathing breathable area and the second exhalation breathable area respectively.

[0128] As further explanation, the breathable membrane 500 here is preferably formed by membrane compression molding.

[0129] See further Figure 9 The diagram illustrates the configuration of the drain valve 600 used in this example. Specifically, the drain valve 600 in this example comprises two parts: a drain valve bracket 610 and a one-way drain valve 620.

[0130] The drain valve bracket 610 is embedded in the drain hole 260 on the side wall of the valve body 200, forming a drain channel that connects to the second air passage inside the valve body; at the same time, the one-way drain valve 620 is placed in the drain channel.

[0131] As a preferred option, the one-way drain valve 620 is formed using a cross-shaped silicone drain valve.

[0132] The following details the implementation and application process of the bidirectional check valve presented in this example.

[0133] Combination Figure 1 and Figure 2 As shown, this bidirectional check valve is assembled through the following process during application.

[0134] First, the drain valve 600 is fixedly installed on the valve body 200;

[0135] Next, the intake channel fixing member 420 is installed into the second exhaust channel on the exhaust channel movable member 340, and the second spring 440 is sleeved on the intake channel movable member 430. The intake channel movable member 430 with the second spring 440 sleeved is engaged with the intake channel fixing member 420, so that the second spring 440 abuts against the intake channel fixing member 420 and the intake channel movable member 430 respectively. At the same time, the second sealing assembly 450 is arranged on the intake channel movable member 430 and the exhaust channel movable member 340, thereby completing the setting of the second air passage valve core assembly 400 in the exhaust channel movable member 340.

[0136] Next, a first sealing component 360 is installed on the bottom end face of the exhaust channel movable component 340 on which the second air passage valve core assembly 400 is installed, and the exhaust channel movable component 340 is installed as a whole in the valve cavity of the valve body 200. The first spring 350 is sleeved on the exhaust channel movable component 340, and the exhaust channel fixing component 330 is installed in the open end of the valve body 200, so that the exhaust channel fixing component 330 and the exhaust channel movable component 340 form a nested fit and abut against the first spring 350, thereby completing the setting of the first air passage valve core assembly 300.

[0137] Next, the breathable membrane 500 is placed over the exhaust channel fixture 330;

[0138] Finally, the valve body protective cover 100 is placed on the valve body 200. The valve body protective cover 100 restricts (presses) the breathing membrane 500 and the exhaust channel fixing member 330 on the valve body 200, so that the first airway valve core assembly 300 is limited and fixed inside the valve body 200, and at the same time, the breathing membrane 500 is fixedly covered on the first airway valve core assembly 300, and the breathing membrane 500 can communicate with the outside of the valve body.

[0139] When the bidirectional check valve assembled accordingly is used, it is directly fixed to the component to be used (such as a battery pack) based on the mounting plate 220 on the valve body 200.

[0140] Here, we will take a battery pack as an example to explain the working process of a two-way check valve.

[0141] The two-way check valve is sealed on the battery pack via its mounting plate, and the bottom air intake channel fixture 420 is in communication with the inner wall of the battery pack.

[0142] See Figure 10 The diagram shown is an example of a two-way check valve in the open intake passage state.

[0143] When there is a certain negative pressure inside the pack, such as P: ≤ ±4Kpa, the first spring 350 inside the two-way check valve, based on its own elastic force, keeps the drive exhaust channel movable part 340 in contact with the bottom of the valve body 200 and presses the first sealing component 260 to form a first sealing structure, thereby blocking the communication between the second air passage 320 and the inside of the battery pack.

[0144] At the same time, the second spring 440 inside the two-way check valve forms an elastic driving force on the intake channel movable part 430 against the intake channel fixed part 420 based on the elastic force, so that the intake channel movable part 430 is in the extended state and the second sealing assembly 450 is in a non-pressurized state, so that the second sealing structure is in a failed state, thereby making the third air passage 410 connected to the inside of the battery pack.

[0145] At this time, the two-way check valve is in the one-way open state of the air intake channel, and the air intake channel movable part 430 is in the one-way open state. After the internal and external gases exchange through the second ventilated area on the breathing ventilated membrane 500, they enter the battery pack body through the first air passage 310 and the third air passage 410 until the internal and external pressure difference is balanced.

[0146] See Figure 11 The diagram shown is an example of a two-way check valve in the open exhaust passage state.

[0147] When there is a certain positive pressure inside the battery pack, such as P: 4≤P≤10Kpa, the pressure on the movable part 430 of the air intake channel will be greater than the elastic force generated by the second spring 440 on the movable part 430 of the air intake channel. This will overcome the elastic force and cause the movable part 430 of the air intake channel to move towards the fixed part 420 of the air intake channel and be in a contracted state. When it moves and contracts, it will simultaneously press the second sealing component 450 to form a second sealing structure, blocking the communication between the third air passage 410 and the inside of the battery pack, and the air intake channel will be closed.

[0148] Based on this, the internal pressure of the battery pack further increases, and the pressure acting on the intake channel movable member 430 further increases. When this pressure is greater than the elastic force generated by the first spring 350 on the exhaust channel movable member 340, it will drive the intake channel movable member 430 to continue to move and retract towards the intake channel fixed member 420. This will further drive the exhaust channel movable member 340, which is in contact with it, to overcome the elastic force generated by the first spring 350 on the exhaust channel movable member 340, so that the exhaust channel movable member 340 moves and retracts towards the exhaust channel fixed member 330. During the movement, it will simultaneously lose the pressure on the first sealing component 360, thereby causing the sealing state of the first sealing structure to fail, thus connecting the second air passage 320 with the inside of the battery pack. At this time, the exhaust passage is opened.

[0149] At this time, the exhaust channel movable part 340 is in a one-way open state. The gas inside and outside the battery pack passes through the second air passage 320, and then exchanges with the first breathable area on the breathable membrane 500 before being discharged outside the valve body until the internal and external pressure difference is balanced.

[0150] See Figure 12 The diagram shown is an example of a two-way check valve in the open state of the condensate drain channel.

[0151] Combination Figure 11 As shown, with the exhaust channel open, the internal air pressure acts on the cross silicone drain valve simultaneously, causing it to open in one direction, and the liquid condensed inside the valve body will be forced out of the valve.

[0152] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A two-way check valve, characterized in that, It includes a valve body protective cover, a valve body, a first airway valve core assembly, a second airway valve core assembly, and a breathing membrane; The breathable membrane is formed with a first breathable zone and a second exhalation breathable zone with different air permeability. One end of the valve body is open, and a valve hole is provided at the bottom of the other end; The first air passage valve core assembly is configured as an elastic and retractable structure and has a first air passage formed inside it. The first air passage valve core assembly is installed in the valve cavity of the valve body. The first air passage penetrates the valve cavity of the valve body. A second air passage is formed between the first air passage valve core assembly and the valve body. An openable first sealing structure is formed between one end of the second air passage and the valve hole. The second air passage valve core assembly is configured as an elastic and retractable structure and is integrally installed in one end of the first air passage of the first air passage of the first air passage valve core assembly. A third air passage is formed between the second air passage valve core assembly and the first air passage valve core assembly, which can connect the inner cavity of the first air passage with the outside of the valve body. Under external force, an openable second sealing structure can be formed between the second air passage valve core assembly and the first air passage valve core assembly to isolate the third air passage. The breathable membrane is disposed at the open end of the valve body, and the first breathable area and the second exhalation breathable area on it correspond to the other end of the first airway and the other end of the second airway in the first airway valve core assembly, respectively. The valve body protective cover is placed on the open end of the valve body, which can limit the breathing membrane and the first airway valve core assembly, and allow the breathing membrane to communicate with the outside of the valve body.

2. The bidirectional check valve according to claim 1, characterized in that, The first air passage valve core assembly includes an exhaust passage fixing component, an exhaust passage movable component, a first spring, and a first sealing component; The exhaust channel fixing component is provided with a first exhaust channel, and at least one air hole is opened on the outside of the first exhaust channel. The exhaust channel fixing component is set in the open end of the valve body, and the air hole on it communicates with the valve cavity inside the valve body. The movable exhaust channel is provided with a second exhaust channel adapted to the first exhaust channel. The movable exhaust channel is movably placed in the valve cavity of the valve body. One end cooperates with the fixed exhaust channel to form a nested structure, so that the movable exhaust channel can move back and forth axially relative to the fixed exhaust channel. The other end can abut against the bottom of the valve body. The second exhaust channel in the movable exhaust channel is connected with the first exhaust channel in the fixed exhaust channel to form a first air passage. The outer walls of the fixed exhaust channel and the movable exhaust channel are connected with the inner wall of the valve cavity of the valve body to form a second air passage. A first sealing assembly is provided between the movable part of the exhaust channel and the bottom of the valve body; a first spring is provided between the movable part of the exhaust channel and the fixed part of the exhaust channel, and the first spring is configured to drive the movable part of the exhaust channel to maintain contact with the bottom of the valve body and press the first sealing assembly to form a first sealing structure between the inner cavity of the valve body and the valve hole.

3. The bidirectional check valve according to claim 2, characterized in that, The exhaust channel fixing component or the exhaust channel movable component is injection molded.

4. The bidirectional check valve according to claim 2, characterized in that, The second air passage valve core assembly includes an intake passage fixing component, an intake passage moving component, a second spring, and a second sealing component. The intake channel fixing component is fixedly installed in the second exhaust channel on the exhaust channel movable component. One end of the intake channel movable component is movably installed in the intake channel fixing component and can move quantitatively relative to the intake channel fixing component along the axial direction, while forming a third air passage between it and the inner wall of the second exhaust channel. The second sealing assembly is disposed between the other end of the intake passage movable part and the mating structure of the exhaust passage movable part, and can form a second sealing structure between the mating structures when under pressure; The second spring is disposed between the movable part of the air intake channel and the fixed part of the air intake channel, and is configured to drive the movable part of the air intake channel to be in a non-pressure state against the second sealing assembly in the initial state.

5. The bidirectional check valve according to claim 4, characterized in that, The intake channel fixing component or intake channel moving component is injection molded.

6. The bidirectional check valve according to claim 1, characterized in that, The bidirectional check valve also includes a drain valve, which is installed on the valve body and forms a one-way connection with the second air passage inside the valve body.

7. The bidirectional check valve according to claim 6, characterized in that, The drain valve includes a drain valve bracket and a one-way drain valve. The drain valve bracket is embedded in the side wall of the valve body, forming a drain channel that connects to the second air passage inside the valve body. The one-way drain valve is placed in the drain channel.

8. The bidirectional check valve according to claim 1, characterized in that, The breathable membrane is made of e-PTFE.

9. The bidirectional check valve according to claim 1, characterized in that, The valve body protective cover or valve body is injection molded.

Images