Anti-explosion ventilation valve

Abstract

The anti-explosion ventilation valve comprises a valve body, a valve body is installed in the valve body, the valve body can move in the direction of the central axis of the valve body, a ventilation film is arranged on the valve body, and ventilation holes are formed in the upper surface of the valve body; magnets with opposite polarities are installed at the opposite positions of the valve body and the valve body, when the pressure borne by the anti-explosion ventilation valve is small, the valve body is connected with the valve body, and gas is exhausted outwards from the ventilation hole after passing through a first flow channel in the valve and the ventilation film. When the pressure in the anti-explosion ventilation valve is increased to exceed the bearing pressure of the anti-explosion ventilation valve, the valve body is separated from the valve, and gas passes through the second flow channel between the valve body and the valve, the first flow channel of the valve, the ventilation film and the ventilation hole to be exhausted outwards. Opening and closing of a quick exhaust channel of the breather valve are achieved through magnetic force, and compared with a spring-driven breather valve, the problem that the explosion-proof reliability is reduced due to the fact that the spring is large in elastic force fluctuation, prone to rusting in an acid environment and elastic force attenuation is solved. And the equipment safety is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of valves, and particularly relates to an explosion-proof breather valve. Background Art

[0002] With the rapid development of China's new energy vehicle and energy storage industries, the power and energy density are continuously increasing, which puts higher requirements on the safety of battery equipment. A stable equipment working environment is the premise and important guarantee for equipment safety. Therefore, the performance and reliability requirements for explosion-proof breather valves are constantly increasing. How to ensure that the equipment is waterproof and dustproof while realizing the timely discharge of harmful gases inside the equipment and balancing the pressure difference inside and outside the equipment is the key to realizing the safe and reliable operation of the equipment. It also puts higher requirements on explosion-proof breather valves.

[0003] In the related art, the explosion-proof valves installed and used are mainly explosion-proof valve breather valves with spring structures. Affected by the inherent characteristics of the spring, the spring will deform after long-term use, resulting in the attenuation of the opening pressure of the explosion-proof valve, causing unstable pressure and potential safety hazards. Summary of the Invention

[0004] The purpose of the present invention is to provide an explosion-proof breather valve to solve the problems in the prior art.

[0005] To this end, the present invention provides an explosion-proof breather valve installed on a battery pack, including a valve body. A valve is installed inside the valve body. The valve can move along the direction of the central axis of the valve body. A breathable membrane is provided on the valve. An air vent is opened on the upper surface of the valve body.

[0006] Magnets with opposite polarities are installed at the relative positions of the valve body and the valve. When the pressure borne by the explosion-proof breather valve is relatively small, the valve body is connected to the valve. After the gas passes through the first flow channel and the breathable membrane inside the valve, it is discharged outward through the air vent.

[0007] When the pressure inside the explosion-proof breather valve increases to exceed the bearing pressure of the explosion-proof breather valve, the valve body is separated from the valve. The gas passes through the second flow channel between the valve body and the valve, the first flow channel of the valve, the breathable membrane and is discharged outward through the air vent.

[0008] As a further description of the above technical solution, a support plate is provided inside the valve body. One end of the valve is slidably connected to the opening on the support plate. Multiple air holes are opened on the support plate.

[0009] As a further description of the above technical solution, a sealing ring is provided on the surface of the valve body in contact with the valve.

[0010] As a further description of the above technical solution, a plurality of grooves are provided on both the valve body and the valve. Magnets are placed in the grooves, and through holes are provided at the bottoms of the grooves in the valve.

[0011] As a further description of the above technical solution, the magnet is a permanent magnet or an electromagnet.

[0012] As a further description of the above technical solution, an upper cover is fixed above the valve body. Vent holes are provided on the surface of the upper cover, and the vent holes include a first vent hole and a second vent hole.

[0013] As a further description of the above technical solution, a plurality of the first vent holes are provided, and the first vent holes are provided in the middle of the upper cover. A plurality of the second vent holes are provided, and the second vent holes are distributed on the edge of the upper cover.

[0014] As a further description of the above technical solution, the area of a single first vent hole is smaller than the area of a single second vent hole.

[0015] As a further description of the above technical solution, both the valve body and the valve are made of a mixed material of nylon and glass fiber.

[0016] As a further description of the above technical solution, a lower cover is provided below the valve body.

[0017] Beneficial effects:

[0018] 1. The present invention provides an explosion-proof breather valve, which realizes the opening and closing of the rapid exhaust passage of the breather valve through magnetic force. Compared with the spring-driven breather valve, it reduces the problems of reduced explosion-proof reliability caused by large fluctuations in spring force, easy rusting in an acidic environment, and spring force attenuation. The safety of the equipment is improved. Description of the drawings

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0020] Figure 1 It is a cross-sectional view of the normal working mode of the explosion-proof breather valve provided by the present invention.

[0021] Figure 2 It is a cross-sectional view of the rapid exhaust and pressure relief working mode of the explosion-proof breather valve provided by the present invention.

[0022] Figure 3 It is a top view of the explosion-proof breather valve provided by the present invention.

[0023] In the figure: 1, valve body; 2, valve; 3, breathable membrane; 4, vent hole; 401, first vent hole; 402, second vent hole; 5, magnet; 6, first flow channel; 7, second flow channel; 8, support plate; 9, air hole; 10, sealing ring; 11, groove; 12, through hole; 13, upper cover; 14, lower cover. Detailed implementation manners

[0024] The content of the present invention can be more easily understood by referring to the following detailed description of the preferred implementation methods of the present invention and the included embodiments. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the art to which the present invention belongs. When there is a contradiction, the definition in this specification shall prevail.

[0025] As Figures 1-3 shown, an explosion-proof breathable valve is installed on a battery pack, and specifically includes a valve body 1. A valve 2 is installed inside the valve body 1. The valve 2 can move along the direction of the central axis of the valve body 1. A breathable membrane 3 is provided on the valve 2. A vent hole 4 is opened on the upper surface of the valve body 1. A lower cover 14 is installed at the lower end of the valve body 1;

[0026] Magnets 5 with opposite polarities are installed at the relative positions of the valve body 1 and the valve 2. When the pressure borne by the explosion-proof breathable valve is relatively small, the valve body 1 and the valve 2 are connected. After the gas passes through the first flow channel 6 and the breathable membrane 3 inside the valve 2, it is discharged outward through the vent hole 4. In this case, under the action of the two magnets 5 with opposite polarities, the valve body 1 and the valve 2 still remain tightly connected, allowing some gas to be discharged normally outward;

[0027] When the pressure inside the explosion-proof breathable valve increases to exceed the bearing pressure of the explosion-proof breathable valve, the valve body 1 and the valve 2 are separated. The gas passes through the second flow channel 7 between the valve body 1 and the valve 2, the first flow channel 6 of the valve 2, the breathable membrane 3 and is discharged outward through the vent hole 4. In this case, due to the increase in gas pressure, while the gas is discharged outward through the first flow channel 6, a force is exerted on the valve 2. Since the increase in the force exceeds the connection force between the two magnets 5, the valve 2 is separated from the inner wall of the valve body 1, so that there is a second flow channel 7 between the valve body 1 and the valve 2, thereby accelerating the gas discharge, improving the exhaust speed and exhaust efficiency, and reducing the risk.

[0028] Through the above technical solution, by using the magnet 5 to replace traditional elastic parts such as springs, the opening pressure is made more stable, solving the problem in the related art that the opening pressure of the explosion-proof valve valve 2 decays due to spring deformation and the pressure is unstable, effectively improving the protection performance of the explosion-proof valve.

[0029] Optionally, a support plate 8 is provided inside the valve body 1. One end of the valve 2 is slidably connected to the opening on the support plate 8. In other words, the valve 2 is sleeved in the opening, and the valve 2 can slide axially along the opening. Moreover, the end of the valve 2 is larger than the diameter of the opening, so as to limit the moving distance of the valve 2 and prevent the valve 2 from separating from the valve body 1. At the same time, a plurality of air holes 9 are provided on the support plate 8. When the pressure borne by the explosion-proof breather valve is relatively small, the main gas inlet is the first flow channel 6 at the end of the valve 2. When the pressure inside the explosion-proof breather valve increases to exceed the bearing pressure of the explosion-proof breather valve, the main gas inlets are the first flow channel 6 at the end of the valve 2 and the air holes 9. Through the air holes 9, the gas can enter the second flow channel 7, which helps the gas to be discharged.

[0030] Optionally, a sealing ring 10 is provided on the surface where the valve body 1 contacts the valve 2. When there is no relative movement between the valve body 1 and the valve 2, the sealing ring 10 can ensure the airtightness of the connection between the two. At the same time, a sealing ring 10 is also provided on the lower surface of the valve body 1. When the explosion-proof breather valve is installed on the battery pack, the sealing ring 10 can ensure the airtightness of the connection between the explosion-proof breather valve and the battery pack, improving safety.

[0031] Optionally, for the installation method of the magnet, a plurality of grooves 11 are provided on both the valve body 1 and the valve 2. Magnets 5 are placed in the grooves 11, and through holes 12 are provided at the bottoms of the grooves 11 in the valve 2. The grooves 11 on the valve body 1 correspond to the grooves 11 on the valve 2, which can ensure the stability of the connection of the magnets 5 at two corresponding positions. In some other realizable embodiments, it is sufficient that the magnets 5 at two corresponding positions partially correspond, and the magnets 5 can be adsorbed to ensure the stability of the connection between the valve 2 and the valve body 1. And through holes 12 are provided at the bottoms of the grooves 11 where the valve 2 is located. After the valve 2 is taken out of the valve body 1, the magnets 5 can be pushed out of the grooves by using a thin needle or a thin rod through the positions of the through holes 12, so as to facilitate the replacement of the magnets 5, and the size, characteristics and magnetic force of the magnets 5 can be adjusted to meet different specifications and design requirements.

[0032] Optionally, the magnet 5 is a permanent magnet 5 or an electromagnet 5. In some embodiments, when the magnet 5 is selected as an electromagnet 5, it is more convenient to control the on / off of the magnet 5, and at the same time, the specifications such as the magnetic force of the magnet can be adjusted more flexibly to meet different usage requirements.

[0033] Optionally, an upper cover 13 is fixed above the valve body 1, and the ventilation holes 4 are formed on the surface of the upper cover 13. The ventilation holes 4 include a first ventilation hole 401 and a second ventilation hole 402. Among them, a plurality of first ventilation holes 401 are provided, and the first ventilation holes 401 are arranged in the middle of the upper cover 13. A plurality of second ventilation holes 402 are provided, and the second ventilation holes 402 are distributed on the edge of the upper cover 13. For specific reference Figure 3 , wherein the size of the first ventilation hole 401 is smaller than that of the second ventilation hole 402. When the pressure is small, the gas can be slowly exhausted through the first ventilation hole 401 and the second ventilation hole 402. When rapid pressure relief is required, the larger-sized second ventilation hole 402 can accelerate the pressure relief speed. At the same time, the method of coexisting small-sized and large-sized ventilation holes 4 can be faster when explosion-proof pressure relief is required compared to only having a single small-sized ventilation hole 4, reducing risks. Compared with only having a single large-sized ventilation hole 4, it can effectively avoid excessive pressure relief in non-emergency situations, so that when explosion-proof pressure relief is truly required, it cannot effectively play its role and cannot control the pressure within a safe range.

[0034] Optionally, both the valve body 1 and the valve 2 are made of a mixed material of nylon and glass fiber, so that the valve 2 and the valve body 1 have good mechanical properties, thermal properties, chemical stability, and electrical properties, and are suitable for the industrial field.

[0035] Working principle: Normal working mode: When the explosion-proof breather valve is working normally, driven by the pressure difference inside and outside the equipment, the gas passes through the first flow channel 6 at the bottom of the breather valve 2, that is, the slow exhaust channel, and after passing through the breathable membrane 3, the gas inside and outside the equipment is circulated to balance the pressure difference inside and outside the equipment.

[0036] Fast exhaust pressure relief working mode: When the internal pressure of the equipment suddenly increases and the pressure difference inside and outside exceeds the opening pressure of the breather valve 2, the breather valve 2 opens, and at the same time, the second flow channel 7 of the breather valve, that is, the fast exhaust channel, is opened. At this time, an unobstructed exhaust channel between the equipment and the outside world is realized, and the internal pressure can be quickly released to avoid more serious consequences such as explosion of the equipment caused by excessive internal pressure that cannot be released in time.

[0037] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An explosion-proof vent valve, characterized in that: Installed on the battery pack, comprising a valve body, a valve installed in the valve body, the valve can move along the direction of the central axis of the valve body, a breathable membrane is arranged on the valve, and a vent hole is opened on the upper surface of the valve body; The valve body and the valve are provided with magnets with opposite polarities at relative positions. When the explosion-proof breathable valve is subjected to a relatively small pressure, the valve body is connected to the valve, and the gas passes through the first flow channel and the breathable membrane in the valve and is discharged from the vent hole. When the pressure in the explosion-proof breathable valve increases to exceed the withstand pressure of the explosion-proof breathable valve, the valve body is separated from the valve, and the gas passes through the second flow channel between the valve body and the valve, the first flow channel of the valve, the breathable membrane and is discharged to the outside through the vent hole.

2. The explosion-proof vent valve according to claim 1, characterized in that: A support plate is arranged in the valve body, one end of the valve is slidably connected with an opening on the support plate, and a plurality of air holes are opened on the support plate.

3. The explosion-proof vent valve according to claim 1, characterized in that: A sealing ring is arranged on the surface of the valve body in contact with the valve.

4. The explosion-proof vent valve according to claim 1, characterized in that: A plurality of grooves are provided on the valve body and the valve, magnets are placed in the grooves, and through holes are provided at the bottoms of the grooves in the valve.

5. The explosion-proof vent valve according to claim 1, characterized in that: The magnet is a permanent magnet or an electromagnet.

6. The explosion-proof vent valve according to claim 1, characterized in that: An upper cover is fixed on the upper part of the valve body, and the vent holes are opened on the surface of the upper cover. The vent holes include a first vent hole and a second vent hole.

7. The explosion-proof vent valve according to claim 6, characterized in that: A plurality of the first vent holes are provided, and the first vent holes are provided in the middle of the upper cover, and a plurality of the second vent holes are provided, and the second vent holes are distributed on the edge of the upper cover.

8. The explosion-proof vent valve according to claim 1, characterized in that: The area of ​​a single first ventilation hole is smaller than the area of ​​a single second ventilation hole.

9. The explosion-proof vent valve according to claim 1, characterized in that: The valve body and the valve are both made of a mixed material of nylon and glass fiber.

10. The explosion-proof vent valve according to claim 1, characterized in that: A lower cover is arranged below the valve body.

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