A zero-leak gas check valve seal

Abstract

The utility model discloses a kind of zero-leakage gas one-way valve sealing structure, including valve body and valve core subassembly, valve core subassembly is arranged inside valve body, and including valve core, rubber sealing block and screw;Valve core's step portion is fixed with rubber sealing block, the sealing block has plastic deformation ability, can keep constant sealing specific pressure under different working pressure, realize reliable sealing under high-low pressure environment;Valve body inside is equipped with conical section, and rubber sealing block is attached to form seal, conical section is low in machining precision requirement, facilitate assembly;Valve core subassembly opens passage when inflating, allow gas to flow into pressure storage container;After stopping inflation, spring and gas pressure jointly act, so that sealing block is tightly attached to conical section, cut off gas circuit, prevent gas leakage;In addition, inlet end is equipped with filter screen, prevent impurities from entering, improve the reliability and service life of valve;The utility model structure is simple, sealing is reliable, applicable to high-pressure gas storage and industrial pneumatic system etc. scene.

Description

Technical Field

[0001] This utility model relates to the field of one-way valve sealing technology, specifically a zero-leakage gas one-way valve sealing structure. Background Technology

[0002] One-way valves are mainly installed at the inlet of pressure storage containers. When the pressure storage container needs to be pressurized, the valve core in the one-way valve separates from the sealing surface, causing the one-way valve to open and allowing high-pressure gas to flow forward into the pressure storage container. After pressurization is completed, the one-way valve prevents the gas in the pressure storage container from flowing backward, thus avoiding a drop in pressure.

[0003] Existing check valve structures are suitable for specific working conditions. For example, existing zero-leakage check valves can usually only adapt to a narrow working pressure range, while check valves that adapt to a wider pressure range are difficult to achieve zero leakage of the working medium. To address this problem, this utility model proposes a combined valve core structure. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the existing defects and provide a zero-leakage gas check valve sealing structure. It adopts an integrated structure, which is easy to install and disassemble. The sealing structure adopts a metal and non-metal combined valve core sealing form, and the non-metal sealing structure has a compensation function. When the check valve is working, the working medium passes through the protective filter screen at the inlet, which intercepts mechanical impurities in the working medium, thereby improving the service life of the product and effectively solving the problems in the background technology.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a zero-leakage gas one-way valve sealing structure, including a valve body 1 and a valve core assembly 3. The valve core assembly 3 is disposed inside the valve body 1. The valve core assembly 3 includes a screw 8, a rubber sealing block 9, and a valve core 10. The valve core 10 is slidably connected to the inner wall of the flow channel of the valve body 1. A stepped portion 13 is provided at the left end of the valve core 10. The rubber sealing block 9 is disposed in the groove on the end face of the stepped portion 13, and the rubber sealing block 9 is fixedly connected to the stepped portion 13 by the screw 8. A conical section 14 is provided inside the valve body 1. The rubber sealing block 9 contacts the inner wall of the conical section 14. The stepped portion 13 forms a positioning step, corresponding to the right end of the conical section 14. An oblique hole 11 is provided in the circumferential direction of the valve core 10.

[0006] Furthermore, the left end of the valve body 1 is set as the inlet, the right end is set as the outlet, and the two ends of the valve body 1 are provided with threads on their circumferential surfaces.

[0007] Furthermore, a base 5 is provided at the outlet end of the valve body 1, and a spring 4 is provided between the base 5 and the valve core 10.

[0008] Furthermore, a filter screen 2 is provided at the inlet of the valve body 1, and the filter screen 2 is fixed by a nut with holes.

[0009] Furthermore, a combined seal is provided in the circumferential direction of the valve body 1, which includes a sealing ring 6 and a protective ring 7.

[0010] Furthermore, the diameter of the tapered section 14 is smaller than the diameter of the valve core 10, and the valve core 10 is provided with an annular groove 12 in the circumferential direction, which communicates with the oblique hole 11.

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

[0012] 1. The sealing structure adopts a combination of metal and non-metal valve core sealing, and the non-metal sealing structure has a compensation function; when the check valve is working, the working medium passes through the protective filter screen at the inlet, intercepting mechanical impurities in the working medium, thereby improving the service life of the product.

[0013] 2. The sealing pressure of the rubber sealing block 9 can be kept basically constant. Under low pressure, the sealing ring is narrower, and under high pressure, the sealing ring is wider. The ratio of air pressure to sealing ring is basically the same. Therefore, this solution can ensure that ideal sealing effect can be achieved under both low and high pressure conditions.

[0014] 3. The design includes a limit step to prevent overpressure from damaging the non-metallic sealing block, thus improving system safety. The imported protective filter effectively blocks impurities, prevents valve core jamming, and extends service life. The combined valve core structure reduces the requirements for the machining accuracy of the sealing cone surface, making manufacturing and maintenance simpler. 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 valve core assembly structure of this utility model.

[0017] In the diagram: 1. Valve body; 2. Filter screen; 3. Valve core assembly; 4. Spring; 5. Base; 6. Sealing ring; 7. Protective ring; 8. Screw; 9. Rubber sealing block; 10. Valve core; 11. Inclined hole; 12. Annular groove; 13. Stepped section; 14. Conical section. Detailed Implementation

[0018] 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.

[0019] Please see Figure 1-2 This utility model provides a technical solution: a zero-leakage gas one-way valve sealing structure, including a valve body and a valve core assembly. The valve core assembly is disposed inside the valve body and includes a screw, a rubber sealing block, and a valve core. The valve core is slidably connected to the inner wall of the flow channel of the valve body. A stepped portion is provided at the left end of the valve core. The rubber sealing block is disposed in the groove at the end face of the stepped portion, and the rubber sealing block is fixedly connected to the stepped portion by a screw. The rubber sealing block has a certain plastic deformation capacity. When the one-way valve is closed, the sealing specific pressure of the rubber sealing block can remain basically constant under different working pressures of the pressure storage container. The sealing ring is narrower under low pressure and wider under high pressure. The ratio of gas pressure to sealing ring is basically consistent. Therefore, this solution can ensure ideal sealing performance under both low and high pressure conditions. The valve body has a conical section inside. The machining accuracy requirement of the conical surface of the conical section is low. It can be assembled after machining with ordinary machine tools without excessive grinding of the sealing conical surface of the conical section. The rubber sealing block contacts the inner wall of the conical section, and the stepped part forms a positioning step, which corresponds to the right end of the conical section. Specifically, it forms a corresponding step, which is equivalent to a limit. It prevents the rubber sealing block of the valve core assembly from being over-compressed when the system is under reverse overpressure and the inlet pressure is zero, causing permanent deformation or sealing failure and reverse leakage. The valve core has an oblique hole in the circumferential direction. This oblique hole is used for the conduction of the one-way valve due to the flow of the medium.

[0020] Rubber sealing blocks have good elasticity and resilience, and are suitable for sealing environments from low temperature to medium and high temperature; advantages: oil resistance, corrosion resistance, aging resistance, and adaptability to certain deformation pressure.

[0021] The left end of the valve body is set as the inlet, the right end is set as the outlet, and the circumferential surfaces of both ends of the valve body are threaded.

[0022] A base is provided at the outlet end of the valve body, and a spring is provided between the base and the valve core. When the valve is pressurized, the air pressure pushes the valve core assembly to move, and the valve core assembly separates from the sealing surface of the conical section of the valve body. The gas enters the pressure storage container from the inner cavity of the valve body. When the pressurization stops, the valve core assembly seals with the sealing surface of the conical section of the valve body under the action of the spring and the air pressure, cutting off the gas path and preventing the high-pressure gas in the pressure storage container from leaking out.

[0023] The valve body inlet is equipped with a filter screen, which is fixed by a perforated nut. The filter screen is designed to prevent the valve core assembly from being contaminated by foreign matter, which could cause jamming or reverse leakage, thereby improving product reliability and service life.

[0024] The valve body is provided with a combined seal in the circumferential direction. The combined seal includes a sealing ring and a protective ring. The combined seal serves to seal the pressure storage container and prevent air leakage.

[0025] The diameter of the conical section is smaller than the diameter of the valve core. The valve core has an annular groove in the circumferential direction, which is connected to the oblique hole. There is a gap between the conical section and the inner wall of the valve body to allow gas to flow and facilitate gas entry into the annular groove.

[0026] The one-way valve of this application is superior to traditional one-way valves in terms of sealing performance, reliability, adaptability and ease of maintenance, and is suitable for various application scenarios such as high-pressure gas storage and industrial pneumatic systems.

[0027] Working principle: During inflation, gas enters from the valve body inlet, pushing the valve core assembly towards the outlet, separating the valve core from the sealing surface of the conical section, allowing the gas to smoothly enter the pressure storage container. When inflation stops, under the action of the spring and the high-pressure gas in the pressure storage container, the valve core assembly resets, causing the rubber sealing block to tightly adhere to the sealing surface of the conical section, cutting off the airflow and achieving zero-leakage sealing. In addition, a filter screen is installed at the valve body inlet to block impurities from entering the valve core assembly, preventing jamming or sealing failure. The rubber sealing block can automatically adjust the width of the sealing ring according to changes in air pressure, ensuring stable sealing under both low and high pressure conditions. The limiting step prevents excessive deformation of the sealing block under overpressure, further improving the reliability and service life of the seal.

[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 zero-leakage gas check valve sealing structure, comprising a valve body (1) and a valve core assembly (3), characterized in that: The valve core assembly (3) is located inside the valve body (1). The valve core assembly (3) includes a screw (8), a rubber sealing block (9), and a valve core (10). The valve core (10) is slidably connected to the inner wall of the flow channel of the valve body (1). A stepped portion (13) is provided at the left end of the valve core (10). The rubber sealing block (9) is located in the groove on the end face of the stepped portion (13), and the rubber sealing block (9) and the stepped portion (13) are fixedly connected by the screw (8). A conical section (14) is provided inside the valve body (1). The rubber sealing block (9) contacts the inner wall of the conical section (14). The stepped portion (13) forms a positioning step, corresponding to the right end of the conical section (14). An oblique hole (11) is provided in the circumferential direction of the valve core (10).

2. The zero-leakage gas check valve sealing structure according to claim 1, characterized in that: The left end of the valve body (1) is set as the inlet and the right end is set as the outlet, and the two ends of the valve body (1) are threaded.

3. The zero-leakage gas check valve sealing structure according to claim 2, characterized in that: A base (5) is provided at the outlet end of the valve body (1), and a spring (4) is provided between the base (5) and the valve core (10).

4. The zero-leakage gas check valve sealing structure according to claim 2, characterized in that: A filter screen (2) is provided at the inlet of the valve body (1), and the filter screen (2) is fixed by a nut with holes.

5. The zero-leakage gas check valve sealing structure according to claim 1, characterized in that: The valve body (1) is provided with a combined seal in the circumferential direction, which includes a sealing ring (6) and a protective ring (7).

6. The zero-leakage gas check valve sealing structure according to claim 1, characterized in that: The diameter of the tapered section (14) is smaller than the diameter of the valve core (10). The valve core (10) has an annular groove (12) in the circumferential direction, and the annular groove (12) is connected to the inclined hole (11).

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