Threaded explosion-proof pressure release valve with moisture-proof and silt-proof functions

Abstract

A threaded explosion-proof pressure release valve with moisture-proof and silt-proof functions comprises a cover, a spring, a breathable film, a valve, a guide column, a pressing piece, an inner sealing ring, a middle sealing ring, a valve body and a pressing ring, the pressing piece is pressed on the upper portion of the valve body, the inner sealing ring and the middle sealing ring are both arranged between the pressing piece and the valve body, the guide column is arranged in the valve body in a penetrating mode, a groove is formed in the upper portion of the pressing piece, and the valve is arranged in the groove. A middle through hole communicated with the middle channel is formed in the middle of the groove, the upper end of the valve is arranged in the groove, the lower end of the valve is arranged in the middle through hole in a penetrating mode, the breathable film is pressed on the top of the pressing piece through the pressing ring and covers the groove, and a first channel is formed among the cover, the pressing piece, the valve body and the groove. The first channel can be communicated with the middle channel through the breathable film and the valve, and a second channel is formed between the guide column and the valve body. According to the explosion-proof valve, ventilation and explosion-proof pressure relief are designed into two channels, so that the explosion-proof valve keeps the original ventilation and explosion-proof functions, the silt-proof problem is solved, and the reliability of the product is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of pressure relief explosion-proof valves, and particularly relates to a threaded explosion-proof pressure relief valve with moisture-blocking and anti-sand functions. Background Art

[0002] At present, pressure relief explosion-proof valves with various designs are applied to new energy vehicle battery packs, energy storage cabinets and other sealed heat-generating components, all of which adopt the same structural principle. There are some functional problems and disadvantages in actual applications, which are detailed as follows:

[0003] 1. Not sand-proof: The ventilation function and the explosion-proof pressure relief function of the current explosion-proof valve are designed for the same channel. To achieve the ventilation function, the top of the external channel is designed as a circle of openings. The disadvantage of this design is that due to the complex and changeable vehicle conditions, substances such as sand and mud are likely to invade through the openings. Sand and mud accumulate on the inner side wall of the channel, making it difficult to open the explosion-proof valve, resulting in phenomena such as being unable to open or getting stuck; or after opening, sand adheres to the surface of the internal seal, preventing the valve cover from closing, leading to seal failure, and water or mud entering the machine shell. To address this shortcoming, some manufacturers' solution is to add a downward flanging design to the outer edge of the upper cover of the external channel, and add an upward retaining wall to the valve body directly below the flange, and control the gap size between the retaining wall and the flange to achieve the effect of blocking sand and mud from entering. However, this structure still has defects. By reducing the gap, only large-particle sand can be blocked, and small-particle sand particles cannot be effectively protected and are still likely to invade the valve body. Moreover, due to the too-small ventilation gap design, mud is likely to accumulate and solidify in the gap, blocking the valve body, resulting in attenuation or failure of the ventilation performance. After opening, sand falls into the valve, still causing seal failure and water ingress into the machine shell.

[0004] 2. Unable to reach the IPX9K protection level: As mentioned above, the ventilation port of the current product is in the upward direction at the top of the valve body. The disadvantage of this design is that during the IPX9K test, high-pressure water jets are injected into the opening, and the water pressure accumulates and reflects, lifting the lid, and water enters the valve body and flows into the shell interior, failing to meet the IPX9K protection level requirements. During vehicle driving, there are often road conditions with high-pressure splashing water. If the explosion-proof valve does not meet the IPX9K protection level requirements, it is easy for water to enter the battery pack, resulting in the vehicle being unable to start and drive normally or causing accidents due to battery pack short-circuit.

[0005] 3. Defects in magnetic suction airtightness test: The current product adopts a magnet adsorption design, and a magnetic adsorption jig is used to open the valve cover from the outside of the explosion-proof valve for airtightness test. The defect of this design is that an iron part needs to be installed inside the explosion-proof valve, and the surface treatment of the iron part is a control difficulty, and rust is likely to occur, corroding the ventilation membrane valve cavity, resulting in blockage of the ventilation channel or damage to the ventilation membrane, leading to failure of the ventilation function or valve leakage.

[0006] 4. High manufacturing cost of the valve design: The humidity control design of the existing explosion-proof valve is a method of matching a valve flap, a spring and a gasket, or a method of matching a double valve flap, a gasket, a spacer and a rivet and fixing them with glue. Both of these two methods can achieve the humidity control function, but the disadvantages are complex structure, low production efficiency and high cost. Content of the Utility Model

[0007] The utility model aims to solve at least one of the technical problems in the related art to a certain extent.

[0008] Therefore, the technical solution adopted by the utility model is: a threaded explosion-proof pressure relief valve with moisture resistance and anti-silt functions, including a lid, a spring, a breathable film, a valve flap, a guide post, a pressing piece, an inner sealing ring, a middle sealing ring, a valve body and a pressing ring. The pressing piece presses on the upper part of the valve body. The inner sealing ring and the middle sealing ring are both arranged between the pressing piece and the valve body. The guide post is arranged in the valve body. A middle channel is arranged in the middle of the guide post, and a retaining ring is arranged at the bottom of the guide post. A groove is arranged on the upper part of the pressing piece, and a middle through hole communicating with the middle channel is arranged in the middle of the groove. The upper end of the valve flap is arranged in the groove, and the lower end of the valve flap passes through the middle through hole. The breathable film is pressed on the top of the pressing piece by the pressing ring and covers the groove. The lid is threadedly connected with the pressing piece. The spring is sleeved on the guide post, and the lower end of the spring is connected with the retaining ring. When the upper part of the pressing piece moves downward under gas pressure, it can contact the spring and be connected with its upper end. A first channel is formed between the lid, the pressing piece, the valve body and the groove, and the first channel can be connected with the middle channel through the breathable film and the valve flap. A second channel is formed between the guide post and the valve body.

[0009] The inner sealing ring and the middle sealing ring are coaxially arranged, the inner sealing ring is arranged inside the middle sealing ring, and two grooves for installing the inner sealing ring and the middle sealing ring respectively are arranged on the upper part of the valve body.

[0010] An outer sealing ring is arranged at the lower part of the valve body.

[0011] Compared with the prior art, the utility model has the following beneficial effects: The utility model designs the ventilation and explosion-proof pressure relief into two channels, so that while the explosion-proof valve maintains the original ventilation and explosion-proof functions, the problem of anti-silt is solved, and the reliability of the product is improved; The explosion-proof valve cover is designed with a downward flanging, which blocks water from shooting in from above the valve cover. A ventilation gap is formed between the side of the valve cover and the valve body. A retaining wall is added upward on the valve body to block water from shooting into the valve, and the gap between the valve cover and the valve body is reduced to reduce the risk of water shooting into the valve. A 45° chamfer design is added to the retaining wall to extend the flanging height of the lid, and the gap opening is downward to form a labyrinth structure to block the water from shooting through the gap into the valve body. This design can meet the requirements of the IPX9K protection level and solve the problem of waterproof failure of products such as battery packs; The utility model mainly uses rubber material to make the humidity control valve flap, and uses the elastic characteristics of the valve flap to control the opening pressure and the air inlet and outlet flow rate of the valve flap, so as to achieve the humidity control function. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is a schematic diagram of the explosion structure of the present utility model;

[0013] Figure 2 is a schematic diagram of the structure of the upper cover;

[0014] Figure 3 is a three-dimensional structure schematic diagram of the upper cover;

[0015] Figure 4 is a three-dimensional structure schematic diagram of the pressing sheet; Figure Ⅰ ;

[0016] Figure 5 is a three-dimensional structure schematic diagram of the pressing sheet; Figure Ⅱ ;

[0017] Figure 6 is a top view of the valve body;

[0018] Figure 7 is a three-dimensional view of the valve body;

[0019] Figure 8 is a bottom view of the valve body. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0021] On the contrary, the present application covers any alternatives, modifications, equivalent methods and solutions made within the spirit and scope of the present application as defined by the claims. Further, in order to enable the public to have a better understanding of the present application, some specific details are described in detail in the following detailed description of the present application. Those skilled in the art can fully understand the present application without the description of these specific details.

[0022] See Figures 1 to 8, A threaded explosion-proof pressure relief valve with moisture-blocking and anti-sediment functions, characterized in that it includes a lid 1, a spring 2, a breathable membrane 3, a valve flap 4, a guide post 5, a pressing piece 6, an inner sealing ring 7, a middle sealing ring 8, a valve body 9 and a pressing ring 11. The pressing piece 6 presses on the upper part of the valve body 9, and the inner sealing ring 7 and the middle sealing ring 8 are both arranged between the pressing piece 6 and the valve body 9. The guide post 5 is arranged in the valve body 9, a middle channel 51 is arranged in the middle of the guide post 5, and a retaining ring 52 is arranged at the bottom of the guide post 5. A groove 62 is arranged on the upper part of the pressing piece 6, and a middle through hole 61 communicating with the middle channel 51 is arranged in the middle of the groove 62. The upper end of the valve flap 4 is arranged in the groove 62, and the lower end of the valve flap 4 passes through the middle through hole 61. The breathable membrane 3 is pressed on the top of the pressing piece 6 by the pressing ring 11 and covers the groove 62. The lid 1 is threadedly connected to the pressing piece 6. The spring 2 is sleeved on the guide post 5, and the lower end of the spring 2 is connected to the retaining ring 52. When the upper part of the pressing piece 6 is subjected to gas pressure and moves downward, it can contact the spring 2 and be connected to its upper end. A first channel is formed between the lid 1, the pressing piece 6, the valve body 9 and the groove 62, and the first channel can be connected to the middle channel 51 through the breathable membrane 3 and the valve flap 4. A second channel is formed between the guide post 5 and the valve body 9.

[0023] The inner sealing ring 7 and the middle sealing ring 8 are coaxially arranged, the inner sealing ring 7 is arranged inside the middle sealing ring 8, and two grooves for installing the inner sealing ring 7 and the middle sealing ring 8 respectively are arranged on the upper part of the valve body 9.

[0024] An outer sealing ring 10 is arranged at the lower part of the valve body 9.

[0025] External threads are arranged at the lower part of the pressing piece 6, internal threads are arranged at the upper part of the guide post 5, and the pressing piece 6 is threadedly connected to the guide post 5.

[0026] When the pressure difference inside and outside the package is unbalanced due to reasons such as temperature difference changes, the pressure difference inside and outside the package is balanced through the first channel of the explosion-proof valve; when thermal runaway or other reasons cause the internal air pressure of products such as battery packs to rise sharply, rapid pressure relief is achieved through the second channel to realize the explosion-proof function.

[0027] Gas exchanges inside and outside through the middle channel of the guide post, the breathable membrane and the valve flap. The breathable membrane has functions of waterproof, dustproof and anti-oil pollution, and liquids such as water cannot enter the inside of the valve body through the breathable membrane.

[0028] The second channel is compressed and sealed with the pressing piece through the inner sealing ring and the middle sealing ring to prevent external substances such as sediment from invading, solving the problem that the explosion-proof valve fails due to the invasion of sediment and the like during actual road conditions.

[0029] When air pressure accumulates on the surface of the pressing piece, the pressing piece is connected to the spring, and the spring is compressed by the force to drive the pressing piece to open outward, realizing direct connection between the second channel and the outside of the battery pack, and the air pressure is discharged from the second channel to form rapid pressure relief, reducing the explosion risk of components such as battery packs, thereby realizing the explosion-proof function.

[0030] Through the above structure, while the explosion-proof valve maintains its original functions of ventilation and explosion-proof, the problem of preventing sediment is solved, and the reliability of the product is improved.

[0031] The utility model adopts the design of turning the edge of the explosion-proof valve cover downward to prevent water from shooting in from above the valve cover. A ventilation gap is formed between the side of the valve cover and the valve body. A retaining wall is added upward on the valve body to prevent water from shooting into the valve, reducing the gap between the valve cover and the valve body, and reducing the risk of water shooting into the valve. A 45° chamfer design is added to the retaining wall to extend the height of the flanging of the cover. The gap opening faces downward, forming a labyrinth structure to prevent the shooting water from entering the valve body through the gap. This design can meet the requirements of the IPX9K protection level and solve the problem of waterproof failure of products such as battery packs.

[0032] The utility model mainly uses a rubber material to make the humidity control valve flap, and uses the elastic characteristics of the valve flap to control the opening pressure of the valve flap and the flow rate of air inlet and outlet, so as to achieve the humidity control function.

[0033] The valve flap is composed of three parts: a duckbill, a valve flap wall, and a valve flap pad.

[0034] When the pressure difference between the inside and outside of components such as the battery pack is balanced, the duckbill and the valve flap wall of the valve flap are in a closed state, without gas exchange, blocking the entry of moisture; when the internal pressure of components such as the battery pack is greater than the external pressure, a positive pressure environment is formed, and the internal gas is discharged outward through the explosion-proof valve. The air flow acts on the valve flap through the middle channel of the explosion-proof valve guide post, and the pressure accumulates on the inner side of the valve flap. When the pressure is greater than the designed opening pressure of the valve flap, the valve flap wall is lifted upward to open, and the air flow is discharged through the gap between both sides of the valve flap wall and the valve body, achieving the function of balancing the air pressure.

[0035] When the internal pressure of components such as the battery pack is less than the external pressure, a negative pressure environment is formed, and gas is supplemented into the package through the explosion-proof valve. The air flow enters through the ventilation holes on the upper cover outside the explosion-proof valve, and then acts on the valve flap through the ventilation membrane. The pressure accumulates on the outer side of the valve flap. When the pressure is greater than the designed opening pressure of the valve flap, the downward duckbill of the valve flap opens, and the air flow enters the package through the duckbill, achieving the function of balancing the air pressure.

[0036] The valve flap is installed in the ventilation groove between the pressing piece and the ventilation membrane. The depth of the ventilation groove is designed to be lower than the valve flap pad of the valve flap. After the ventilation membrane is installed, it presses the valve flap pad to fix the valve flap in the ventilation groove.

[0037] Working principle: The valve flap wall fits with the surface of the ventilation groove of the pressing piece, and the assembly pressure of the ventilation membrane compresses the valve flap pad, so that the valve flap wall is in a sealed state when the pressure is balanced and in a negative pressure; the negative pressure air inlet hole is designed in the shape of a duckbill, and the two valve flap pieces are closed, and are in a sealed state when the pressure is balanced and in a positive pressure.

[0038] Through the above structure, the wall thickness and size of the valve wall and duckbill are designed to control the exhaust flow and opening pressure. When the pressure is balanced, the explosion-proof valve is always in a closed state, effectively achieving the effect of humidity control. The advantages of this structure are: simple structure, low unit cost; reducing other valve auxiliary parts, saving overall cost; saving space inside the valve, increasing the valve pressure relief area, and improving the valve pressure relief flow. It is easy to install, improves production efficiency, and reduces production costs.

[0039] In view of the structural optimization of the defects of magnetic suction airtightness test, the utility model makes adjustments as shown in the following figure:

[0040] The utility model mainly adopts an air suction function to replace the magnetic suction function of the prior art. After the explosion-proof valve is installed on the valve body, an air suction fixture is used to suck up and open the valve cover from the outside, thereby achieving the purpose of performing an airtight test on the inside of a battery pack and other components.

[0041] The utility model does not install a magnetic iron sheet in the space between the valve cover and the air-permeable membrane, eliminates the iron sheet parts in the prior art, and uses the principle of magnetic attraction to perform airtight testing.

[0042] During the test, the airtight fixture is stuck in the slot on the explosion-proof valve, the fixture handle is rotated to press down the air suction cup to suck the valve cover of the explosion-proof valve, the fixture push rod is lifted up to lift the valve cover, and the limit handle is tightened. At this time, the explosion-proof valve is in the open state, and the airtight test is performed using the inflation quick interface on the fixture.

[0043] The above structural optimization features are: solving the problem of air permeability failure and water leakage caused by rusted iron sheets in explosion-proof valves, and improving the service life and reliability of explosion-proof valves. The air permeability gap between the air permeable membrane and the valve cover is increased, avoiding the risk of low air permeability caused by the air permeable membrane pressing against the upper cover. The utility model structure achieves the function of 100% protection of explosion-proof valves against sediment and other substances; improves the protection level; reduces the cost of valve parts and assembly production costs; and avoids the potential risk of air permeability and water leakage failure of the magnetic suction structure.

Claims

1. A threaded explosion-proof pressure relief valve with moisture-proof and sediment-proof functions, characterized by: The valve body comprises a cover, a spring, a breathable membrane, a valve, a guide column, a pressing sheet, an inner sealing ring, a middle sealing ring, a valve body and a pressing ring, wherein the pressing sheet is pressed on the upper part of the valve body, the inner sealing ring and the middle sealing ring are both arranged between the pressing sheet and the valve body, the guide column is penetrated in the valve body, a middle channel is arranged in the middle of the guide column, a retaining ring is arranged at the bottom of the guide column, a groove is arranged on the upper part of the pressing sheet, a middle through hole connected to the middle channel is arranged in the middle of the groove, the upper end of the valve is arranged in the groove, the lower end of the valve is penetrated in the middle through hole, the breathable membrane is pressed on the top of the pressing sheet through the pressing ring and covers the groove, the cover is threadedly connected to the pressing sheet, and the spring is sleeved on the guide column The lower end of the spring is connected with the retaining ring, and when the upper part of the pressing plate moves downward under the gas pressure, it can contact the spring and be connected with the upper end thereof, a first channel is formed between the cover and the pressing plate, the valve body and the groove, the first channel can be connected with the middle channel through the breathable membrane and the valve, and a second channel is formed between the guide column and the valve body; the inner sealing ring is coaxially arranged with the middle sealing ring, the inner sealing ring is arranged in the middle sealing ring, and two grooves for installing the inner sealing ring and the middle sealing ring are arranged on the upper part of the valve body respectively; an outer sealing ring is arranged on the lower part of the valve body, the cover is designed with a downward flange, a retaining wall is added upward on the valve body, and a 45° chamfer design is added on the retaining wall.

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