High-performance nylon explosion-proof pressure-relief waterproof breathable joint

Abstract

The utility model discloses a high-performance nylon explosion-proof pressure-relief waterproof ventilation joint, which comprises a joint shell and a ventilation base, a first O-shaped sealing ring and a second O-shaped sealing ring are respectively arranged in the joint shell, and the first O-shaped sealing ring and the second O-shaped sealing ring are used for realizing double sealing of the joint, a box body and an internal structure. The first O-shaped sealing ring is arranged close to the top of the connector shell, the second O-shaped sealing ring is arranged close to the middle of the connector shell, a waterproof breathable film is attached to the breathable base, a gland is arranged on the waterproof breathable film, the waterproof breathable film is connected with the gland, and small protruding points are evenly distributed on the end face of the gland. The spring pressure relief assembly is composed of a stainless steel pressure spring and an end face elastic buckle, the end face elastic buckle is fixed to a limiting shaft of the ventilation base in an inner buckle bouncing-off mode, metal is replaced with nylon materials, the weight is reduced, and meanwhile the requirements for high temperature and mechanical strength are met through structural optimization.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of joint device, concretely relates to a high-performance nylon explosion-proof pressure relief waterproof and breathable joint. BACKGROUND

[0002] In the field of new energy automobile battery PACK, energy storage battery PACK and electric vehicles, the explosion-proof pressure relief waterproof and breathable joint is the key component to maintain the balance of the air pressure inside and outside the box, prevent condensation and dust intrusion. Although the traditional metal explosion-proof valve can meet the strength requirement, it has problems such as heavy weight, high cost and complex assembly process. Although the existing nylon joint is light, its structure design still relies on glue bonding, thread fixing and other methods, resulting in complicated assembly process and difficulty in meeting the requirements of high temperature, high precision and reusability. The O-ring waterproof structure is composed of an internal O-ring, an external O-ring and a corresponding installation shell. The O-ring is compressed in the installation groove, and the sealing contact surface is compressed. The breathable membrane structure is mainly composed of a waterproof and breathable membrane. The waterproof and breathable membrane is attached to the breathable base using back glue, and then a gland is used for compression to protect the waterproof and breathable function, so that the internal and external air pressure of the joint box is kept in balance and the phenomenon of condensation and fogging is prevented. Finally, the spring explosion-proof pressure relief structure is fixed on the limiting shaft of the breathable base by the spring buckle. When the air pressure reaches the design pressure, the spring is pre-compressed and compressed again, so that the internal O-ring is disabled to achieve the function of gas relief. When the internal pressure decreases, the spring rebounds to seal the device again.

[0003] The nylon explosion-proof pressure relief waterproof and breathable joint is usually combined with the joint body by injection molding, welding, bonding, hot melting and other process means to form a protective assembly that can be assembled and disassembled. Generally, an installation hole is formed on the side wall or cover of the power battery box, and the nylon explosion-proof pressure relief waterproof and breathable joint is installed on the side wall or cover of the battery box by bolts. The gas inside and outside the battery box is compensated by passing through the gas passage of the joint and the breathable membrane under the action of pressure difference, so as to keep the balance of the gas pressure inside and outside the battery box. As a component for maintaining the internal environment clean and keeping the balance of the internal and external air pressure, the explosion-proof pressure relief waterproof and breathable joint is widely used in the field of automobile power battery. When designing the vehicle power battery box, the explosion-proof pressure relief waterproof and breathable joint has become a standard configuration to prevent the vehicle from being affected by rain, dust, oil stains and high and low temperature in the use condition, and to provide protection for the stable and reliable work of the battery system.

[0004] In the prior art, the combination of the O-shaped sealing ring, the air permeable film and the spring pressure relief structure can realize the basic functions, but has the following defects: material limitation: the cost of metal material is high, the strength of plastic material is insufficient, and it is difficult to balance the high temperature sealing performance and environmental protection demand; complex process: the air permeable film needs to be bonded by glue and protected by a cover, and the spring is fixed by screwing, resulting in low production efficiency; non-repeatability: some pressure relief structures are designed for one-time use and cannot meet the requirements of multiple detection and long-term use; environmental protection problem: traditional process uses glue and non-environmental protection materials, which does not meet the green manufacturing trend.

[0005] Therefore, there is an urgent need for a lightweight, high-strength, easy-to-assemble and reusable nylon explosion-proof pressure relief waterproof and air-permeable joint to solve the above technical problems. Content of the utility model

[0006] In view of the problems in the above background art, the purpose of the utility model is to provide a high-performance nylon explosion-proof pressure relief waterproof and air-permeable joint, which has the advantages of lightweight, high strength, easy assembly and reusability.

[0007] In order to achieve the above technical purpose, the utility model adopts the following technical scheme:

[0008] A high-performance nylon explosion-proof pressure relief waterproof and air-permeable joint, comprising a joint shell and an air-permeable base, the joint shell is provided with a first O-shaped sealing ring and a second O-shaped sealing ring, the first O-shaped sealing ring and the second O-shaped sealing ring are used to realize the double sealing of the joint and the box body and the internal structure, the first O-shaped sealing ring is arranged near the top of the joint shell, the second O-shaped sealing ring is arranged near the middle of the joint shell, the air-permeable base is attached with a waterproof and air-permeable film, the waterproof and air-permeable film is provided with a cover, the waterproof and air-permeable film is connected with the cover, and the end face of the cover is provided with uniformly distributed small protrusions.

[0009] Further comprising a spring pressure relief assembly, the spring pressure relief assembly is composed of a stainless steel compression spring and an end face spring buckle, and the end face spring buckle is fixed on the limiting shaft of the air-permeable base by an internal buckle spring opening mode.

[0010] Further limited, the joint shell is made of high-strength nylon material and is injection molded.

[0011] Further limited, the cover and the air-permeable base are connected through a buckling structure, and at least one uniformly distributed small protrusion is arranged at the buckling position. Such a structure design replaces the glue bonding by the buckling structure, improving the assembly efficiency.

[0012] Further limited, the end face spring buckle is a ring-shaped spring piece structure, the inner diameter of the end face spring buckle is in interference fit with the limiting shaft of the air-permeable base, and the outer edge of the end face spring buckle is provided with a anti-dropping buckle.

[0013] Further limited, the first O-shaped sealing ring and the second O-shaped sealing ring are made of silicone rubber.

[0014] Further limited, the joint shell outer wall is provided with a standard thread.

[0015] Further limited, the spring pressure relief assembly can reset to the initial compression state after pressure relief.

[0016] The beneficial effects of the utility model are:

[0017] 1. Lightweight and high strength: nylon material is used to replace metal, weight is reduced, and high temperature and mechanical strength requirements are met through structure optimization;

[0018] 2. Assembly efficiency is improved: snap-on cover and elastic buckle type spring fixing structure reduce the use of glue and threaded assembly steps, and the assembly time is greatly shortened;

[0019] 3. Repeatability and controllability: the spring can reset after pressure relief, supports multiple detection and long-term use, adopts spring force top cover design, the burst point can be directional and controllable, and the burst pressure error is low;

[0020] 4. Environmental compatibility: all components are made of recyclable nylon and silicone rubber materials, and are installed in a threaded manner, which meets the RoHS standard, reduces the maintenance cost of the sealing body, and has the advantages of high performance, high reliability, and high safety;

[0021] 5. Waterproof and dustproof performance: the design of rapid inflation, the waterproof and explosion-proof valve is specially designed, the supporting tooling can be inflated quickly, and the installation is convenient, which is convenient for cavity sealing inspection, secondly, double O-shaped sealing ring and IP68 level air permeable film ensure stable work in harsh environment. BRIEF DESCRIPTION OF DRAWINGS

[0022] The utility model can be further illustrated by the non-limiting embodiments shown in the drawings;

[0023] Figure 1 is a sectional view of the utility model high-performance nylon explosion-proof pressure relief waterproof and air permeable joint embodiment;

[0024] Figure 2 is a structural schematic view of the utility model high-performance nylon explosion-proof pressure relief waterproof and air permeable joint embodiment.

[0025] The main element symbol is explained as follows: end face elastic buckle 1, stainless steel compression spring 2, first O-shaped sealing ring 3, joint shell 4, second O-shaped sealing ring 5, air permeable base 6, air permeable film 7, cover 8. DETAILED DESCRIPTION

[0026] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0027] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] like Figure 1 As shown, this utility model discloses a high-performance nylon explosion-proof, pressure-relief, waterproof, and breathable connector, comprising a connector housing 4 and a breathable base 6. The connector housing 4 is internally provided with a first O-ring 3 and a second O-ring 5, which are used to achieve a double seal between the connector and the housing and internal structure. The first O-ring 3 is positioned near the top of the connector housing 4, and the second O-ring 5 is positioned near the middle of the connector housing 4. A waterproof and breathable membrane 7 is attached to the breathable base 6, and a pressure cap 8 is provided on the waterproof and breathable membrane 7. The waterproof and breathable membrane 7 is connected to the pressure cap 8, and the end face of the pressure cap 8 has evenly distributed small protrusions to enhance the clamping force.

[0030] The spring pressure relief assembly is composed of a stainless steel compression spring 2 and an end face elastic buckle 1, which is fixed on the limiting shaft of the breathable base 6 through an internal buckle elastic opening mode. Such a structure design can realize spring pre-compression and controllable pressure relief.

[0031] In the practical application of the embodiment, the joint shell 4 is injection molded with high-strength nylon material. Specifically, the temperature resistance range of the joint shell 4 is -40℃ to 150℃, and the tensile strength is ≥80MPa.

[0032] In the practical application of the embodiment, the gland 8 is connected with the breathable base 6 through a buckling structure, and at least 6 uniformly distributed small protrusions are arranged at the buckling position. In the practical application of the embodiment, the end face elastic buckle 1 is in a ring-shaped elastic sheet structure, and the inner diameter of the end face elastic buckle 1 is in interference fit with the limiting shaft of the breathable base 6, and a anti-dropping buckle is arranged at the outer edge of the end face elastic buckle 1.

[0033] In the practical application of the embodiment, the first O-shaped sealing ring 3 and the second O-shaped sealing ring 5 are made of silicone rubber. Specifically, the compression permanent set of the first O-shaped sealing ring 3 and the second O-shaped sealing ring 5 is ≤15%.

[0034] In the practical application of the embodiment, the outer wall of the joint shell 4 is provided with a standard thread. Specifically, when installed, the joint shell 4 is screwed to the threaded hole of the box body by using a wrench, and the sealing is realized by the deformation of the first O-shaped sealing ring 3.

[0035] In the practical application of the embodiment, the spring of the spring pressure relief assembly can be reset to the initial compression state after pressure relief. Specifically, the pressure relief threshold is 5kPa±0.5kPa, realizing repeated use.

[0036] The assembly steps of the embodiment are as follows:

[0037] Breathable film installation: the waterproof breathable film 7 is attached to the circular groove of the breathable base 6 with the adhesive surface flat, keeping flat and without skew, and a special tool is used to press for 10 seconds to ensure firm adhesion;

[0038] The gland 8 is aligned with the buckling position of the breathable base 6, and vertical pressure is applied to the small protrusions to completely embed the base groove, ensuring that the end face of the gland 8 is tightly pressed on the breathable film 7, forming a glue-free fixed structure.

[0039] Sealing ring assembly: the second O-shaped sealing ring 5 is embedded in the inner circular groove of the joint shell 4, and the circumferential fit is checked to ensure that there is no distortion; the first O-shaped sealing ring 3 is installed in the outer circular groove of the joint shell 4, which is uniformly and tightly attached in the groove, and a small amount of silicone grease is applied for lubrication.

[0040] Spring pressure relief assembly integration: insert the vent base 6 from the round hole of the joint shell 4, press the base bottom surface against the second O-shaped sealing ring 5; put the stainless steel compression spring 2 into the limiting shaft of the vent base 6, then align the end face spring buckle 1 with the shaft end, press it by tools until the inner edge of the spring buckle is clamped into the inner hole of the base, and the spring pre-compression state is fixed.

[0041] Joint installation and use:

[0042] Open M30x1.5 standard threaded holes on the side wall or cover of the battery box;

[0043] Align the outer threads of the joint shell 4 with the threaded holes of the box, and tighten it to 15N.m using a torque wrench, at which time the first O-shaped sealing ring 3 is extruded and deformed, achieving static sealing of the box and the joint;

[0044] When the gas pressure in the box exceeds 5kPa, the gas pressure pushes the vent base 6 to compress the stainless steel compression spring 2, causing the second O-shaped sealing ring 5 to temporarily fail, and the gas is quickly relieved through the venting film 7;

[0045] When the pressure drops below the threshold, the spring rebounds, the sealing ring resets, and the airtightness is restored.

[0046] Detection and maintenance:

[0047] Airtightness detection: inflate the joint to 6kPa by using the matching tool, maintain the pressure for 30 seconds, and the pressure drop should be less than or equal to 0.1kPa to be qualified;

[0048] Repeated use: after pressure relief, check the state of the spring buckle 1 and the sealing ring, and if there is no permanent deformation, it can be repeatedly installed.

[0049] The above embodiments only exemplarily illustrate the principles and effects of the present utility model, and are not used to limit the present utility model. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present utility model. Therefore, all equivalent modifications or changes made by those skilled in the art without departing from the spirit and technical thought disclosed by the present utility model should be covered by the claims of the present utility model.

Claims

1. A high-performance nylon explosion-proof, pressure-relief, waterproof, and breathable joint, characterized in that: The device includes a connector housing (4) and a breathable base (6). The connector housing (4) is provided with a first O-ring (3) and a second O-ring (5) inside. The first O-ring (3) and the second O-ring (5) are used to achieve double sealing between the connector and the housing and internal structure. The first O-ring (3) is located near the top of the connector housing (4), and the second O-ring (5) is located near the middle of the connector housing (4). A waterproof and breathable membrane (7) is attached to the breathable base (6). A pressure cap (8) is provided on the waterproof and breathable membrane (7). The waterproof and breathable membrane (7) is connected to the pressure cap (8). The end face of the pressure cap (8) is provided with evenly distributed small protrusions. It also includes a spring pressure relief assembly, which consists of a stainless steel compression spring (2) and an end face spring buckle (1). The end face spring buckle (1) is fixed to the limiting shaft of the ventilated base (6) by an inward spring-opening method.

2. The high-performance nylon explosion-proof, pressure-relief, waterproof, and breathable joint according to claim 1, characterized in that: The connector housing (4) is injection molded from high-strength nylon material.

3. The high-performance nylon explosion-proof, pressure-relief, waterproof, and breathable joint according to claim 1, characterized in that: The pressure cap (8) and the ventilated base (6) are connected by a fastening structure, and the fastening point is provided with at least 6 evenly distributed small protrusions.

4. The high-performance nylon explosion-proof, pressure-relief, waterproof, and breathable joint according to claim 1, characterized in that: The end face spring buckle (1) is a ring spring structure. The inner diameter of the end face spring buckle (1) is interference-fitted with the limiting shaft of the ventilated base (6), and its outer edge is provided with an anti-detachment buckle.

5. The high-performance nylon explosion-proof, pressure-relief, waterproof, and breathable joint according to claim 1, characterized in that: The first O-ring (3) and the second O-ring (5) are made of silicone rubber.

6. The high-performance nylon explosion-proof, pressure-relief, waterproof, and breathable joint according to claim 1, characterized in that: The outer wall of the connector housing (4) is provided with standard threads.

7. The high-performance nylon explosion-proof, pressure-relief, waterproof, and breathable joint according to claim 1, characterized in that: After the spring pressure relief assembly releases pressure, the spring can return to its initial compressed state.

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