Waterproof breathable explosion-proof valve capable of increasing gas displacement

Abstract

The waterproof breathable anti-explosion valve comprises a valve body, a piston, a spring and a guide rod, the piston is fixedly connected with the guide rod, the guide rod is arranged in the valve body in a penetrating mode, and the spring is arranged on the periphery of the guide rod in a sleeved mode and abuts against the position between the guide rod and the lower end of the valve body. The piston abuts against and covers the exhaust channel of the closed valve body under the elastic action of the spring, a guide ring is arranged in the middle of the valve body, and the guide ring is provided with a sliding hole allowing the guide rod or a rod body of the piston to penetrate through. At most two internal thin connecting ribs are connected between the periphery of the guide ring and the valve body, so that at most two exhaust channels are formed between the periphery of the guide ring and the valve body. According to the utility model, the number of the internal thin connecting ribs is reduced to at most two, so that the blocking to the exhaust channels is reduced, the total area of all the exhaust channels is increased, and the explosion-proof capability is further improved; and the width of the internal thin connecting rib is smaller than or equal to half of the thickness of the valve body, so that the total area of all the exhaust channels is further increased, and then the air displacement is further increased.

Description

Technical field:

[0001] The utility model relates to the technical field of valve products, in particular to a waterproof, breathable and explosion-proof valve with increased exhaust volume. Background technology:

[0002] As the power source for the drive motor, the safety and reliability of the PACK battery pack are of vital importance. However, the power battery pack will release a large amount of gas during use or when it fails due to thermal reasons. If the gas in the sealed box cannot be discharged in time, the air pressure in the box will inevitably rise sharply, forming a large pressure difference. In mild cases, it will affect the normal use of the battery pack. In severe cases, the battery pack will explode. Therefore, it is necessary to install an explosion-proof valve on the power battery to balance the air pressure.

[0003] At present, due to considerations such as product cost and installation space in power battery packs, the overall size of the explosion-proof valve is greatly restricted and cannot be too large. As a result, the exhaust volume of the product cannot reach the ideal amount. Although the explosion-proof function can be achieved, the explosion-proof performance is relatively poor.

[0004] For example, the Chinese utility model patent with patent application number 202421411758.X discloses an explosion-proof valve, a battery and an electrical device, wherein the explosion-proof valve includes a valve body, a valve cover, a valve stem, an elastic member and a limit assembly; the valve body includes a flow passage portion, which is provided with an axial hole; the valve cover is provided on one side of the axial direction of the valve body, and the valve cover has a first state of blocking the flow passage portion and a second state of opening the flow passage portion; the valve stem passes through the axial hole and is connected to the valve cover; the elastic member is connected to the valve stem and the valve body to keep the valve cover in the first state, and the limit assembly is connected to the valve stem and the valve body to keep the valve cover in the second state; the limit assembly includes a first limit portion and a second limit portion, and the first limit portion and the second limit portion are engaged with each other in the second state to maintain the second state; the second limit portion is an annular groove, and the first limit portion is a locking member that is engaged with the annular groove; in the first state, the locking member elastically abuts against the valve stem.

[0005] From Figure 10 of the specification of the patent (202421411758.X), it can be seen that four reinforcing ribs are provided in the valve body of the explosion-proof valve, so that four flow holes are formed in the valve body. Due to the large number of reinforcing ribs, the sum of the areas of all the flow holes in the valve body is not large enough, which makes the exhaust volume of the explosion-proof valve not large enough, and the exhaust pressure relief function is not ideal.

[0006] In view of this, the inventors propose the following technical solutions. Utility model content:

[0007] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a waterproof, breathable and explosion-proof valve with increased exhaust volume.

[0008] In order to solve the above technical problems, the present invention adopts the following technical solutions: the waterproof, breathable and explosion-proof valve with increased exhaust volume includes a valve body, a piston, a spring and a guide rod. The piston is fixedly connected to the guide rod, the guide rod is passed through the valve body, and the spring is sleeved on the outer periphery of the guide rod and abuts between the guide rod and the lower end of the valve body. Under the action of the spring force, the piston abuts and covers the exhaust channel set in the closed valve body. The middle part of the valve body is provided with a guide ring, and the guide ring has a sliding hole for the guide rod or the rod body of the piston to pass through; at most two internal fine connecting ribs are connected between the outer periphery of the guide ring and the valve body, so that at most two of the exhaust channels are formed between the outer periphery of the guide ring and the valve body.

[0009] Furthermore, in the above technical solution, the width of the internal thin connecting rib is less than or equal to half the thickness of the valve body.

[0010] Furthermore, in the above technical solution, the number of the internal thin connecting ribs is two, which are symmetrically distributed on both sides of the guide ring in a straight line to form two exhaust channels of the same size.

[0011] Furthermore, in the above technical solution, the number of the internal thin connecting rib is one, so that an exhaust channel is formed between the outer periphery of the guide ring and the valve body.

[0012] Furthermore, in the above technical solution, an upper sealing ring for sealing assembly is provided between the valve body and the piston, wherein the upper sealing ring is installed at the upper end of the valve body, or the upper sealing ring is installed at the lower end of the piston.

[0013] Furthermore, in the above technical solution, the longitudinal section of the piston is T-shaped, which includes a piston body and a rod body integrally formed at the lower end of the piston body. The lower end of the rod body and the upper end of the guide rod are fixed by threads, welding or interference fit.

[0014] Furthermore, in the above technical solution, the valve body, piston and guide rod are made of metal or plastic, and a lower sealing ring is provided at the lower end of the valve body.

[0015] Furthermore, in the above technical solution, the piston is provided with a through first air hole, the guide rod has a second air hole that passes through the upper and lower ends and is connected to the first air hole, and a waterproof breathable membrane is also fixed to the upper end of the piston, which covers the upper end of the first air hole.

[0016] Furthermore, in the above technical solution, a groove communicating with the first air hole is provided at the upper end of the piston, and the waterproof breathable membrane is attached to the bottom of the groove and fixed together by a pressure ring pressing method, a hot pressing method or a glue fixing method.

[0017] Furthermore, in the above technical solution, the upper end of the piston is also covered with an upper cover, and the upper end of the piston is also provided with a plurality of ventilation grooves passing through its outer side surface and the groove. The upper cover covers the groove to cover the waterproof breathable membrane, and a ventilation channel is formed between the ventilation grooves.

[0018] By adopting the above technical solution, the present invention has the following advantages compared to the prior art: The present invention reduces the number of internal fine connecting ribs to a maximum of two, thereby reducing obstruction to the exhaust passages. This also reduces the number of exhaust passages, thereby increasing the total area of ​​all exhaust passages. This achieves the goal of increasing exhaust volume without changing the overall structure and dimensions of the present invention, thereby improving explosion-proof capabilities. Furthermore, the present invention sets the width of the internal fine connecting ribs to be less than or equal to half the thickness of the valve body, thereby further increasing the total area of ​​all exhaust passages, further increasing exhaust volume, and further improving explosion-proof capabilities. Description of the drawings:

[0019] Figure 1 It is a three-dimensional diagram of the utility model;

[0020] Figure 2 It is a three-dimensional diagram of the present invention from another perspective;

[0021] Figure 3 It is a three-dimensional exploded view of the utility model;

[0022] Figure 4 It is a three-dimensional diagram of the valve body in the utility model;

[0023] Figure 5 It is a three-dimensional diagram of the valve body in the utility model from another perspective;

[0024] Figure 6 This is a first usage state diagram of the utility model;

[0025] Figure 7 This is a second usage state diagram of the utility model;

[0026] Figure 8 This is a third usage state diagram of the utility model;

[0027] Figure 9 It is a three-dimensional diagram of the piston in the utility model. Specific implementation method:

[0028] The present invention will be further described below with reference to specific embodiments and accompanying drawings.

[0029] See Figure 1-9 As shown, a waterproof, breathable and explosion-proof valve for increasing exhaust volume includes a valve body 1, a piston 2, a spring 3 and a guide rod 4.

[0030] The piston 2 is fixedly connected to a guide rod 4, which passes through the valve body 1. The spring 3 is sleeved around the guide rod 4 and abuts between the guide rod 4 and the lower end of the valve body 1. Under the elastic force of the spring 3, the piston 2 abuts against and covers the exhaust passage 10 provided in the closed valve body 1. The valve body 1 has a guide ring 11 in the middle. The guide ring 11 has a sliding hole 111 for the guide rod 4 or the rod body 22 of the piston 2 to pass through, allowing the guide rod 4 or the rod body 22 of the piston 2 to slide relative to the valve body 1. In a normal state, the piston 2 abuts against and covers the exhaust passage 10 provided in the closed valve body 1 under the elastic force of the spring 3, thereby achieving the purpose of sealing the exhaust passage 10. When the gas pressure exceeds the elastic force of the spring 3, thereby compressing the spring 3, the piston 2 is pushed outward relative to the valve body 1 by the gas pressure, thereby opening the exhaust passage 10 and releasing exhaust pressure through the exhaust passage 10, achieving the purpose of explosion protection.

[0031] The area of ​​the exhaust passage 10 determines the pressure relief and explosion-proof capabilities of the present invention. To enhance this capability, the present invention incorporates the following design: a maximum of two internal thin connecting ribs 12 are connected between the periphery of the guide ring 11 and the valve body 1, resulting in a maximum of two exhaust passages 10 formed between the periphery of the guide ring 11 and the valve body 1. In other words, the present invention reduces the number of internal thin connecting ribs 12 to a maximum of two, thereby minimizing obstruction to the exhaust passages 10. This also reduces the number of exhaust passages 10, thereby increasing the total area of ​​all exhaust passages 10. This achieves the goal of increasing exhaust volume without changing the overall structure and dimensions of the present invention, thereby enhancing explosion-proof capabilities.

[0032] Furthermore, the utility model reduces the width of the internal fine connecting ribs 12 to further increase the total area of ​​all exhaust channels 10. The specific design is that the width of the internal fine connecting ribs 12 is less than or equal to half the thickness of the valve body 1, thereby further increasing the total area of ​​all exhaust channels 10, further increasing the exhaust volume, and thus improving the explosion-proof capability.

[0033] In this embodiment, the number of the internal fine connecting ribs 12 is two, which are symmetrically distributed in a straight line on both sides of the guide ring 11 to form two exhaust channels 10 of equal size. The two internal fine connecting ribs 12 symmetrically distributed in a straight line can stably support the guide ring 11, thereby enhancing the stability of the assembly structure of the utility model. Of course, the number of the internal fine connecting ribs 12 can also be set to one, so that an exhaust channel 10 is formed between the outer periphery of the guide ring 11 and the valve body 1. In this way, the total area of ​​all exhaust channels 10 is minimized, the exhaust volume is increased to the maximum, and the explosion-proof effect is optimized. However, the support strength of the guide ring 11 is slightly insufficient for a single internal fine connecting rib 12.

[0034] An upper sealing ring 5 is provided between the valve body 1 and the piston 2 for sealing. When the piston 2 contacts the valve body 1, the upper sealing ring 5 is squeezed and deformed, thereby forming a more effective sealing assembly between the valve body 1 and the piston 2. The upper sealing ring 5 can be installed on the upper end of the valve body 1, or the upper sealing ring 5 can be installed on the lower end of the piston 2. Both assembly structures are valid. Of course, installing the upper sealing ring 5 on the upper end of the valve body 1 is the optimal solution. The upper end of the valve body 1 is provided with a first annular groove 101. The lower end of the upper sealing ring 5 is embedded in the first annular groove 101, and the upper end of the upper sealing ring 5 protrudes outside the first annular groove 101 for contact with the piston 2.

[0035] The valve body 1, piston 2, and guide rod 4 are made of metal or plastic. If the valve body 1, piston 2, and guide rod 4 are made of metal, their structural strength is high and their service life is long. If the valve body 1, piston 2, and guide rod 4 are made of plastic, their structural strength is relatively low and their production cost is low.

[0036] The lower end of the valve body 1 is provided with a lower sealing ring 6. Specifically, the lower end of the valve body 1 is provided with a second annular groove 102, the lower end of the lower sealing ring 6 is embedded in the second annular groove 102, and the upper end of the lower sealing ring 6 protrudes outside the second annular groove 102.

[0037] The piston 2 is provided with a first air vent 20 extending therethrough. The guide rod 4 has a second air vent 40 extending through its upper and lower ends and communicating with the first air vent 20. A waterproof, breathable membrane 7 is also secured to the upper end of the piston 2, covering the upper end of the first air vent 20, thereby providing the present invention with waterproof and breathable properties. The upper end of the piston 2 is provided with a groove 201 communicating with the first air vent 20. The waterproof, breathable membrane 7 is attached to the bottom of the groove 201 and secured thereto by a pressure ring 202, either by pressure, heat pressing, or adhesive bonding. In this embodiment, the pressure ring 202 presses against the outer periphery of the upper end of the waterproof, breathable membrane 7 to secure it to the bottom of the groove 201.

[0038] The upper end of the piston 2 is also covered with an upper cover 23, and the upper end of the piston 2 is also provided with a plurality of ventilation grooves 203 passing through its outer side and the groove. The upper cover 23 covers the groove 201 to cover the waterproof breathable membrane 7, and the ventilation grooves 203 and the ventilation grooves 203 form a ventilation channel.

[0039] The piston 2 has a T-shaped longitudinal cross-section and includes a piston body 21 and a rod 22 integrally formed at the lower end of the piston body 21. The lower end of the rod 22 is secured to the upper end of the guide rod 4 via threads, welding, or an interference fit. The first air vent 20 extends downward from the upper end of the piston 2 through the lower end of the rod 22.

[0040] When the utility model is normally working, it is installed on the battery pack, and its specific working conditions are as follows:

[0041] When in positive pressure exhaust state (such as Figure 6 ), when the gas pressure inside the battery pack is greater than the external air pressure but less than the explosion-proof opening value of the present invention, it belongs to the positive pressure exhaust state. In this state, the gas will pass through the second air vent 40 of the guide rod 4, and then through the first air vent 20 on the piston 2, through the waterproof breathable membrane 7 into the space between the piston 2 and the upper cover 23, and flow out to the outside of the valve body through the air permeable channel between the piston 2 and the upper cover 23, quickly exhausting and releasing pressure, thereby reducing the internal air pressure of the battery pack and achieving pressure balance.

[0042] When in negative pressure exhaust state (such as Figure 7 ), the gas pressure inside the battery pack is lower than the external air pressure, which is a negative pressure intake state. In this state, the gas will enter the piston 4 through the air permeable channel between the piston 2 and the upper cover 23, and then pass through the waterproof breathable membrane 7, the first air permeable hole 20 on the piston 2, and the second air permeable hole 40 on the guide rod 4 to enter the battery pack, achieving pressure balance;

[0043] When in the blasting pressure relief state (such as Figure 8 ), when the internal air pressure of the battery pack is greater than the external air pressure and exceeds the explosion-proof opening value of the utility model, it is in the explosion-proof pressure relief state. Under the action of the internal pressure, the gas will push open the piston 2, and the gas will pass through the exhaust channel 10 of the valve body 1 and be discharged from the gap between the piston 2 and the valve body 1, realizing rapid exhaust and pressure relief, thereby reducing the internal air pressure and achieving pressure balance inside and outside the battery pack.

[0044] In summary, the present invention reduces the number of internal thin connecting ribs 12 to a maximum of two, thereby reducing obstruction to the exhaust passages 10. This also reduces the number of exhaust passages 10, thereby increasing the total area of ​​all exhaust passages 10. This achieves the goal of increasing exhaust volume without changing the overall structure and dimensions of the present invention, thereby improving explosion-proof capabilities. Furthermore, the present invention also sets the width of the internal thin connecting ribs 12 to be less than or equal to half the thickness of the valve body 1, thereby further increasing the total area of ​​all exhaust passages 10, further increasing exhaust volume, and further improving explosion-proof capabilities.

[0045] Of course, the above description is only a specific embodiment of the present invention and is not intended to limit the scope of implementation of the present invention. Any equivalent changes or modifications made based on the structure, features and principles described in the scope of the patent application of the present invention should be included in the scope of the patent application of the present invention.

Claims

1. A waterproof, breathable, explosion-proof valve for increasing exhaust volume, comprising a valve body (1), a piston (2), a spring (3), and a guide rod (4); the piston (2) is fixedly connected to the guide rod (4); the guide rod (4) is inserted into the valve body (1); the spring (3) is sleeved on the outer periphery of the guide rod (4) and abuts between the guide rod (4) and the lower end of the valve body (1); the piston (2) abuts against and covers the exhaust passage (10) provided in the closed valve body (1) under the elastic force of the spring (3); a guide ring (11) is provided in the middle of the valve body (1); the guide ring (11) has a sliding hole (111) for the guide rod (4) or the rod body (22) of the piston (2) to pass through; Its characteristics are: At most two internal thin connecting ribs (12) are connected between the periphery of the guide ring (11) and the valve body (1), so that at most two exhaust channels (10) are formed between the periphery of the guide ring (11) and the valve body (1).

2. A waterproof, breathable, explosion-proof valve with increased exhaust volume according to claim 1, characterized in that: The width of the internal thin connecting rib (12) is less than or equal to half the thickness of the valve body (1).

3. The waterproof, breathable, explosion-proof valve with increased exhaust volume according to claim 1, characterized in that: The number of the internal fine connecting ribs (12) is two, and they are symmetrically distributed on both sides of the guide ring (11) in a straight line to form two exhaust channels (10) of the same size.

4. The waterproof, breathable, explosion-proof valve with increased exhaust volume according to claim 1, characterized in that: The number of the internal fine connecting rib (12) is one, so that an exhaust channel (10) is formed between the periphery of the guide ring (11) and the valve body (1).

5. The waterproof, breathable, explosion-proof valve with increased exhaust volume according to claim 1, characterized in that: An upper sealing ring (5) for sealing assembly is provided between the valve body (1) and the piston (2), wherein the upper sealing ring (5) is installed on the upper end of the valve body (1), or the upper sealing ring (5) is installed on the lower end of the piston (2).

6. A waterproof, breathable, explosion-proof valve with increased exhaust volume according to any one of claims 1 to 5, characterized in that: The piston (2) has a T-shaped longitudinal section and comprises a piston body (21) and a rod body (22) integrally formed at the lower end of the piston body (21). The lower end of the rod body (22) is fixed to the upper end of the guide rod (4) by means of threads, welding or interference fit.

7. A waterproof, breathable, explosion-proof valve with increased exhaust volume according to any one of claims 1 to 5, characterized in that: The valve body (1), the piston (2), and the guide rod (4) are made of metal or plastic, and a lower sealing ring (6) is provided at the lower end of the valve body (1).

8. A waterproof, breathable, explosion-proof valve with increased exhaust volume according to any one of claims 1 to 5, characterized in that: The piston (2) is provided with a through first air vent (20), the guide rod (4) has a second air vent (40) that passes through the upper and lower ends and is in communication with the first air vent (20), and a waterproof air-permeable membrane (7) is fixed to the upper end of the piston (2), and the waterproof air-permeable membrane (7) covers the upper end of the first air vent (20).

9. The waterproof, breathable, explosion-proof valve with increased exhaust volume according to claim 8, characterized in that: The upper end of the piston (2) is provided with a groove (201) communicating with the first air hole (20), and the waterproof breathable membrane (7) is attached to the bottom of the groove (201) and fixed together by a pressure ring (202) or a hot pressing method or a glue fixing method.

10. The waterproof, breathable, explosion-proof valve with increased exhaust volume according to claim 9, characterized in that: The upper end of the piston (2) is also covered with an upper cover (23), and the upper end of the piston (2) is also provided with a plurality of ventilation grooves (203) that pass through the outer side surface and the groove. The upper cover (23) covers the groove (201) to cover the waterproof breathable membrane (7), and the ventilation grooves (203) and the ventilation grooves (203) form a ventilation channel.

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