High-sensitivity gas safety valve sealing structure

Abstract

The utility model discloses a kind of high sensitivity gas safety valve sealing structure, it is related to safety valve technical field, especially applicable to aircraft, high-pressure gas supply system and the occasion of higher response speed and sealing reliability requirement in special equipment;The sealing structure includes valve shell, valve seat, valve, valve seat and front seat, valve and valve seat sliding contact, valve seat is loaded from valve shell lower end, and is fixed by front seat;Valve seat is set in valve seat lower end, its inner wall circumferential direction is equipped with inner boss, and forms limit cavity between valve seat, gasket and sealing ring are equipped in limit cavity, sealing ring and valve end surface fillet form contact seal;Small than 0.2mm sealing gap is left between inner boss and valve seat, so that sealing ring realizes gas path opening and closing in small stroke;Ball surface contact mode guide rod structure transmission elastic force;The utility model has the advantages of short sealing stroke, compact structure, high sensitivity, applicable to high-frequency opening and closing and complex working condition gas system.

Description

Technical Field

[0001] This utility model relates to the field of safety valve technology, specifically a sealing structure for a high-sensitivity gas safety valve. Background Technology

[0002] In applications such as aircraft, high-pressure gas supply systems, and special equipment, where sealing performance and response speed are extremely critical, gas control valves (such as safety valves, check valves, and solenoid valves) are key components. Currently, the most widely used sealing structures are metal cone valve structures or O-ring radial sealing structures. Cone valve structures rely on the hard metal-to-metal contact between the cone surface and the valve seat to form a seal, while O-ring structures achieve pressure sealing by embedding a sealing ring on the outer wall of the valve body.

[0003] However, under complex operating conditions such as long-term pressure, vibration, and impact, these traditional sealing structures have revealed several technical defects. Specifically, these defects include: metal sealing surfaces are prone to damage and failure: the sealing surfaces of cone valves are prone to wear, scratches, and corrosion after long-term operation; large response stroke and insufficient sensitivity: the sealing surface requires a long stroke to fully open / close, which cannot meet the requirements of high-frequency rapid opening and closing; and poor reliability under vibration: maintenance is difficult and the adaptability to operating conditions is poor.

[0004] Especially in aviation gas supply systems, the aforementioned defects of traditional structures are particularly prominent due to the limited space, severe pressure fluctuations, and long maintenance cycles. Therefore, there is an urgent need for a new type of gas safety valve sealing structure that can maintain stable sealing under high-pressure vibration environments, while also possessing rapid response capabilities, a compact structure, and a long service life, in order to meet the pressing needs of modern high-reliability application scenarios. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the existing defects and provide a high-sensitivity gas safety valve sealing structure. This sealing structure is a contact force-bearing structure. Compared with the common cone valve sealing structure, after the sealing surface and the force-bearing surface are separated, it can ensure that the product still has stable sealing performance in the vibration and impact environment, and can effectively solve the problems in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a high-sensitivity gas safety valve sealing structure, comprising a valve body, a valve seat, a valve, a valve seat, and a front seat. The valve slides in contact with the valve seat. The valve seat is installed into the valve body from the lower end, and the valve seat is located at the lower end of the valve seat. An inner boss is provided circumferentially on the inner wall of the valve seat, forming a limiting cavity between the valve seat and the inner boss. A gasket is provided at the bottom of the limiting cavity, and a sealing ring is provided in the limiting cavity. This limiting cavity ensures that the sealing ring still functions under vibration and impact environments. Stable sealing performance: the sealing ring and the rounded corner of the valve end face form a contact seal, and a sealing gap of less than 0.2mm is left between the inner boss and the valve seat end face. The valve end face and the sealing ring contact and separate within a range of 0.2mm to control the rapid sealing and opening of the air circuit, achieving high-sensitivity pressure control. This sealing structure changes the traditional radial sealing structure, and the sealing stroke is greatly shortened, resulting in extremely high sensitivity. The front seat is threaded to the lower end of the valve body, which also fixes the valve seat and valve seat.

[0007] Furthermore, an air inlet is provided at the lower end of the valve body, and an air outlet is provided in the circumferential direction of the valve body. After the safety valve is opened, high-pressure gas enters from the air inlet, passes upward through the valve, and is discharged from the air outlet. This air path is a conventional technology.

[0008] Furthermore, a guide rod is provided in the valve body, an arc-shaped groove is provided at the upper end of the valve, and a conical groove is provided at the lower end of the guide rod. A ball is provided between the conical groove and the arc-shaped groove. The contact method of the ball can adapt to the elastic force of the spring, so that the elastic force is adaptively transmitted downward to the valve.

[0009] Furthermore, a fixing cap is threaded to the upper end of the valve body, and the upper end of the guide rod passes through the top of the fixing cap. A sealing ring is provided between the guide rod and the fixing cap, and a spring is provided between the fixing cap and the lower end of the guide rod. A gasket is provided at the upper end of the spring. When the air circuit is closed, the valve is limited to fit against the valve seat under the action of the spring force, and the sealing ring fits tightly against the valve to achieve a seal. It is suitable for complex working conditions such as vibration and impact. When the system pressure exceeds the set pressure, the air pressure overcomes the spring force of the spring and pushes the valve to move to the low-pressure side. The air circuit opens at the moment the valve separates from the sealing ring, and high-pressure air is discharged from the outlet.

[0010] Furthermore, the sealing ring is made of high-temperature resistant fluororubber or polytetrafluoroethylene material to adapt to different temperature and corrosive gas conditions, thereby improving sealing stability and service life.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] 1. This utility model proposes an innovative solution based on a micro-stroke seal with rounded corners on the valve end face by improving the design of the traditional O-ring sealing structure. It can complete the sealing opening and closing action within a stroke of less than 0.2mm, which greatly improves the sensitivity and accuracy of the valve response. This structure can achieve high-precision control of opening and closing pressure difference and is suitable for high-pressure gas systems with frequent switching and high dynamic response requirements, ensuring the stability of gas circuit control.

[0013] 2. In terms of structure, this utility model adopts a valve and sealing ring contact sealing design, which separates the sealing function from the force-bearing structure, significantly improving the long-term stability of the system under complex working conditions such as high vibration and strong impact; the internal structure is equipped with a limiting cavity, which can effectively prevent the sealing ring from shifting or wearing during long-term operation and maintain a stable and consistent sealing pressure.

[0014] 3. This sealing structure has a compact design and highly integrated components, which facilitates the embedding and rapid installation of small systems. The valve stroke is greatly shortened and the sensitivity is extremely high. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the sealing position structure of this utility model;

[0017] Figure 3 This is a schematic diagram of the gas flow structure of this utility model.

[0018] In the diagram: 1. Front seat, 2. Valve seat, 3. Gasket, 4. Sealing ring, 5. Valve, 6. Valve seat, 7. Spring, 8. Gasket, 9. Sealing ring, 10. Fixing cap, 11. Valve body, 12. Guide rod, 13. Ball, 14. Inner boss, 15. Limiting cavity, 16. Arc groove, 17. Conical groove. Detailed Implementation

[0019] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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. Therefore, they should not be construed as limitations on this utility model. Example 1

[0020] Please see Figure 1-3This utility model provides a technical solution: a high-sensitivity gas safety valve sealing structure, including a valve body 11, a valve seat 6, a valve 5, a valve seat 2, a front seat 1, a sealing ring 4, a gasket 3, a guide rod 12, a ball 13, a spring 7, a fixing cap 10, a sealing ring 9, and other components; the valve 5 slides in contact with the valve seat 6, and the valve seat 6 is inserted from the lower end of the valve body 11 and fixed inside the valve body 11; the valve seat 2 is located at the lower end of the valve seat 6 and is fixed to the lower end of the valve body 11 by threaded connection through the front seat 1; the inner wall of the valve seat 2 is provided with an inner boss 14 in the circumferential direction, and a limiting cavity 15 is formed between the inner boss 14 and the valve seat 2, and a gasket 3 is laid at the bottom of the cavity to support the sealing ring 4, and the sealing ring 4 is located in the limiting cavity 15; the structure of this cavity allows the sealing ring 4 to maintain a stable position in a long-term vibration or impact environment, ensuring sealing reliability.

[0021] The sealing ring 4 is made of high-temperature resistant fluororubber or polytetrafluoroethylene and forms a contact seal with the rounded corner of the end face of the valve 5; a sealing gap of less than 0.2mm is designed between the inner boss 14 and the end face of the valve seat 2 to ensure that when the valve 5 is subjected to the downward pressure of the spring 7, the sealing ring 4 can quickly contact and disengage within 0.2mm, thereby efficiently controlling the closing and opening of the air circuit and improving the response sensitivity.

[0022] The upper end of the valve body 11 is provided with an air inlet, and the circumferential side wall is provided with an air outlet. When the air passage is opened, high-pressure gas flows in through the air inlet, flows upward through the valve 5 and is discharged from the air outlet, forming a normal ventilation path.

[0023] To ensure the stability of the valve 5 during force transmission, a guide rod 12 is provided inside the valve housing 11; the upper end of the valve 5 is provided with an arc-shaped groove 16, and the lower end of the guide rod 12 is provided with a conical groove 17 that matches it, with a ball 13 sandwiched between the two; this spherical contact structure can realize the adaptive adjustment of the elastic force of the guide rod 12 when it moves up and down, ensuring that the spring force is effectively and evenly transmitted to the valve 5.

[0024] The upper end of the guide rod 12 passes through the top of the valve housing 11 and is threaded to the upper end of the valve housing 11 by the fixing cap 10. A sealing ring 9 is provided between the fixing cap 10 and the guide rod 12 to prevent gas leakage. A spring 7 is provided between the fixing cap 10 and the lower end of the guide rod 12, and a gasket 8 is placed on the upper end of the spring 7. When the air circuit is closed, the spring 7 presses the valve 5 downward to fit against the valve seat 2, and the sealing ring 4 is in close contact with the end face of the valve 5 to achieve a seal. When the air pressure in the system exceeds the set threshold, the air pressure will overcome the elastic force of the spring 7 and push the valve 5 upward. The sealing ring 4 will disengage from the valve 5, the air circuit will open instantly, and the high-pressure air will be discharged from the outlet.

[0025] In use: The sealing structure of this safety valve achieves highly efficient sealing and opening / closing action over an extremely short distance by having the valve 5 make contact with the end face of the sealing ring 4 through the rounded corners. Under the design condition that the sealing gap is controlled within 0.2mm, the sealing structure of the limiting cavity 15 and the inner boss 14 effectively restricts the displacement of the sealing ring 4, preventing displacement or damage under high-frequency impact and vibration environments. The elastic force of the spring 7 maintains the air circuit sealing state, and the high-pressure gas quickly opens the air circuit after overcoming the elastic force, thereby achieving sensitive and accurate overpressure protection. The ball contact guide rod structure further enhances the adaptive force transmission efficiency and reduces mechanical interference errors.

[0026] This high-sensitivity gas safety valve sealing structure significantly improves the response speed and control accuracy of sealing opening and closing by compressing the sealing stroke to less than 0.2mm, making it suitable for high-frequency opening and closing conditions, especially for scenarios in high-pressure gas systems where rapid response and control sensitivity are extremely important. Its compact design and high integration allow for wide application in space-constrained fields such as aircraft and special equipment. Simultaneously, the limiting cavity 15 and the inner boss 14 work together to ensure the stable positioning and wear suppression of the sealing ring 4 under long-term vibration and impact conditions, improving the long-term reliability of the entire system. The sealing ring 4 is made of a versatile material, allowing for the selection of fluororubber or polytetrafluoroethylene depending on the operating environment, maintaining good sealing performance and a long service life under extreme conditions such as high temperature and corrosion.

[0027] In practical applications, this structure exhibits excellent scalability and adaptability. The sealing ring 4 material can be replaced with EPDM rubber, silicone, or special engineering plastics depending on the gas type and operating temperature to meet diverse working conditions. The guide rod 12 and the fixed cap 10 can be connected using a quick-connect structure or a snap ring connection to improve assembly and maintenance efficiency. The limiting cavity 15 structure can be further optimized into an elastic clamping or limiting groove form to enhance the stable fixing capability of the sealing ring 4. The spring 7 assembly can be configured with an adjustable preload to adapt to systems of different pressure levels. In addition, the valve body 11 structure can be expanded into a multi-port gas path mode to achieve bidirectional control or bypass exhaust function. Sensor installation interfaces can be reserved at key locations such as the fixed cap 10 and guide rod 12 to realize real-time monitoring and intelligent control of the opening and closing status of the valve 5, providing basic support for intelligent gas control systems.

[0028] The foregoing has shown and described the basic principles, main features and advantages of this utility model. Various changes and modifications may be made to this utility model without departing from the spirit and scope thereof, and all such changes and modifications fall within the scope of this utility model as claimed.

Claims

1. A high-sensitivity gas safety valve sealing structure, comprising a valve body (11), a valve seat (6), a valve (5), a valve seat (2), and a front seat (1), characterized in that: The valve (5) slides in contact with the valve seat (6). The valve seat (6) is installed into the valve housing (11) from the lower end of the valve housing (11). The valve seat (2) is located at the lower end of the valve seat (6). The inner wall of the valve seat (2) is provided with an inner boss (14) in the circumferential direction. A limiting cavity (15) is formed between the valve seat (2) and the inner boss (14). A gasket (3) is provided at the bottom of the limiting cavity (15). A sealing ring (4) is provided in the limiting cavity (15). The sealing ring (4) and the end face of the valve (5) form a contact seal. A sealing gap is left between the inner boss (14) and the end face of the valve seat (2). The sealing gap is less than 0.2 mm. The front seat (1) is threaded to the lower end of the valve housing (11) and fixes the valve seat (2) and the valve seat (6).

2. The high-sensitivity gas safety valve sealing structure according to claim 1, characterized in that: The lower end of the valve body (11) is provided with an air inlet, and the circumferential direction of the valve body (11) is provided with an air outlet.

3. The high-sensitivity gas safety valve sealing structure according to claim 1, characterized in that: A guide rod (12) is provided in the valve body (11), an arc-shaped groove (16) is provided at the upper end of the valve (5), a conical groove (17) is provided at the lower end of the guide rod (12), and a ball (13) is provided between the conical groove (17) and the arc-shaped groove (16).

4. The high-sensitivity gas safety valve sealing structure according to claim 1, characterized in that: The upper end of the valve body (11) is threaded with a fixing cap (10), the upper end of the guide rod (12) passes through the top of the fixing cap (10), and a sealing ring (9) is provided between the guide rod (12) and the fixing cap (10). A spring (7) is provided between the fixing cap (10) and the lower end of the guide rod (12), and a gasket (8) is provided at the upper end of the spring (7).

5. The sealing structure of a high-sensitivity gas safety valve according to claim 1, characterized in that: The sealing ring (4) is made of high-temperature resistant fluororubber or polytetrafluoroethylene.

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