Gas valve with high sealing performance

Abstract

The utility model discloses a gas valve with strong sealing performance, which comprises a valve body and a valve cover fixedly connected with the top end of the valve body, a first baffle plate is arranged at one end of an inlet of an inner cavity of the valve body, a second baffle plate is arranged at one end of an outlet of the inner cavity of the valve body, and a valve head is arranged between the end parts of the first baffle plate and the second baffle plate. A valve rod penetrating through the valve body and the valve cover and extending to the position above the valve cover is arranged at the top end of the valve head, and a sealing assembly is arranged at the joint of the valve cover and the valve body. The gasket is arranged to be of a V-shaped structure, the V-shaped section of the round sealing gasket with the V-shaped section is pre-pressed to generate elastic deformation under the pre-tightening pressure of mounting the valve cover, and the sizes of the inner hole and the outer hole of the sealing gasket are changed, so that the sealing effect between the inner hole of the gasket and the valve rod and between the outer diameter of the gasket and the inner wall of the valve cover is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of gas valves, and in particular relates to a gas valve with strong sealing performance. Background Art

[0002] The gas valve is a device that protects the pressure reducing valve and makes it safe to use. It is also a signal device for the failure of the pressure reducing valve. Gas valves often use oxygen, nitrogen, hydrogen, argon and other gases. These gases are generally stored in special high-pressure gas cylinders. When in use, the pressure reducing valve is used to reduce the gas pressure to the range required for the experiment, and then other control valves are used for fine adjustment to allow the gas to enter the use system.

[0003] When the valve is in use, it needs to be opened and closed, so the valve stem is in an active state, which causes the sealing gasket connected to the valve stem to wear out. Since the existing sealing gaskets connected to the valve stem are flat, when the sealing gaskets are worn, it will affect the sealing of the valve, resulting in sealing failure and medium leakage. Utility Model Content

[0004] The utility model aims to provide a gas valve with strong sealing performance to solve the technical problems raised in the background technology.

[0005] To achieve the above-mentioned purpose, the specific technical scheme of the utility model is as follows: a gas valve with strong sealing performance, comprising a valve body and a valve cover fixedly connected to the top end of the valve body, the inner cavity of the valve body is provided with a first baffle at the inlet end, and a second baffle at the outlet end, a valve head is provided between the ends of the first baffle and the second baffle, and a valve stem is provided at the top end of the valve head, which penetrates the valve body and the valve cover and extends to the top of the valve cover, a sealing assembly is provided at the connection between the valve cover and the valve body, the sealing assembly is composed of two sealing gaskets superimposed and distributed up and down, and the sealing gasket is composed of two relatively distributed gaskets up and down.

[0006] Preferably, the top end of the first baffle is fixedly connected to the top inner wall of the valve body, and the bottom end of the second baffle is fixedly connected to the bottom inner wall of the valve body.

[0007] Preferably, the inner cavity of the valve cover is provided with a lifting thread which is threadedly connected to the valve stem.

[0008] Preferably, a turntable is provided at the top end of the valve stem.

[0009] Preferably, a through hole matching the diameter of the valve stem is provided in the middle portion of the surface of the gasket, and the gasket is arranged in a V-shaped structure at the periphery of the through hole.

[0010] Preferably, the gasket is made of polytetrafluoroethylene material.

[0011] Preferably, a valve head sealing ring is provided at the connection between the valve head and the first baffle plate and the second baffle plate.

[0012] The utility model has the following advantages:

[0013] 1. The utility model sets the gasket into a V-shaped structure. When the circular sealing gasket with a V-shaped cross-section is pre-loaded and elastically deformed under the pre-tightening pressure of the valve cover, the inner and outer aperture sizes of the sealing gasket change, thereby achieving a sealing effect between the inner hole of the gasket and the valve stem, and between the outer diameter of the gasket and the valve body and the inner wall of the valve cover. When the wear size of the gasket inner hole increases, the elastic change of the V-shaped structural section will reduce the size of the gasket inner hole, automatically compensating for the wear between the gasket inner hole and the valve stem. By combining the selection of wear-resistant materials and the structural elastic change, the safe and reliable operation of the valve seal can be guaranteed, and the service life of the sealing component can be extended.

[0014] 2. The gasket of the utility model adopts polytetrafluoroethylene material, so that the sealing component has the characteristics of wear resistance and high temperature resistance, which greatly improves the wear resistance of the sealing component, reduces wear, and achieves the requirement of extending the service life of the sealing component. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solution of the implementation mode of the utility model, the drawings required for use in the implementation mode will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 It is a structural schematic diagram of the sealing component in the utility model.

[0018] Explanation of markings in the figure: 1. valve body; 2. valve cover; 3. first baffle; 4. second baffle; 5. valve stem; 6. turntable; 7. valve head; 8. valve head sealing ring; 9. sealing assembly; 10. sealing gasket; 11. gasket; 12. through hole. DETAILED DESCRIPTION

[0019] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the embodiments of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0020] In the description of the embodiments of the present invention, it should be understood that the terms "length", "vertical", "horizontal", "top", "bottom", etc. indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present invention.

[0021] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0022] In the embodiments of the present utility model, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific circumstances.

[0023] The disclosure below provides many different embodiments or examples for realizing different structures of the embodiments of the present utility model. In order to simplify the disclosure of the embodiments of the present utility model, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the embodiments of the present utility model. In addition, the embodiments of the present utility model can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0024] In order to better understand the purpose, structure and function of the utility model, the utility model is further described in detail below in conjunction with the accompanying drawings.

[0025] like Figure 1-2As shown, a gas valve with strong sealing performance of the utility model comprises a valve body 1 and a valve cover 2 fixedly connected to the top of the valve body 1, the inner cavity of the valve body 1 is provided with a first baffle 3 at one end of the inlet, and a second baffle 4 at one end of the outlet, the top of the first baffle 3 is fixedly connected to the inner wall of the top of the valve body 1, the bottom of the second baffle 4 is fixedly connected to the inner wall of the bottom of the valve body 1, a valve head 7 is provided between the ends of the first baffle 3 and the second baffle 4, the top of the valve head 7 is provided with a valve stem 5 that penetrates the valve body 1 and the valve cover 2 and extends to the top of the valve cover 2, the inner cavity of the valve cover 2 is provided with a lifting thread that is threadedly connected to the valve stem 5, and the top of the valve stem 5 is provided with a turntable 6, by rotating the turntable 6, the valve stem 5 can be rotated, so that the up and down movement of the valve head 7 can be controlled, thereby controlling the opening and closing of the valve. A valve head sealing ring 8 is provided at the connection between the valve head 7 and the first baffle 3 and the second baffle 4.

[0026] A sealing assembly 9 is provided at the connection between the valve cover 2 and the valve body 1. The sealing assembly 9 is composed of two sealing gaskets 10 which are arranged in an upper and lower stacking manner. The sealing gasket 10 is composed of two gaskets 11 which are arranged in an upper and lower relative manner. A through hole 12 which matches the diameter of the valve stem 5 is provided in the middle part of the surface of the gasket 11, and the gasket 11 is arranged in a V-shaped structure at the periphery of the through hole 12. Under the preload pressure of the valve cover 2, the V-shaped section of the circular sealing gasket causes elastic deformation of the V-shaped section preload, and the inner and outer aperture sizes of the sealing gasket change, so as to achieve the sealing effect between the inner hole of the gasket 11 and the valve stem 5, and the outer diameter of the gasket 11 and the inner wall of the valve body 1 and the valve cover 2. When the wear size of the inner hole of the gasket 11 increases, the elastic change of the V-shaped structural section will reduce the size of the inner hole of the gasket 11, and automatically compensate for the wear amount between the inner hole of the gasket 11 and the valve stem 5. By combining the two factors of the selection of wear-resistant materials and the structural elastic change, the safe and reliable operation of the valve seal can be guaranteed, and the service life of the sealing assembly 9 can be extended. The gasket 11 is made of polytetrafluoroethylene material, which has the characteristics of wear resistance and high temperature resistance, so as to improve the wear resistance of the sealing component 9, reduce wear, and achieve the requirement of extending the service life of the sealing component 9.

[0027] It is understood that the present invention is described by some embodiments, and those skilled in the art are aware that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. A gas valve with strong sealing performance, characterized in that: The invention comprises a valve body (1) and a valve cover (2) fixedly connected to the top end of the valve body (1); the inner cavity of the valve body (1) is provided with a first baffle (3) at the inlet end and a second baffle (4) at the outlet end; a valve head (7) is provided between the ends of the first baffle (3) and the second baffle (4); the top end of the valve head (7) is provided with a valve stem (5) which penetrates the valve body (1) and the valve cover (2) and extends to the top of the valve cover (2); a sealing assembly (9) is provided at the connection between the valve cover (2) and the valve body (1); the sealing assembly (9) is composed of two sealing gaskets (10) which are arranged in an upper and lower manner and the sealing gasket (10) is composed of two gaskets (11) which are arranged in an upper and lower manner and are opposite to each other.

2. A gas valve with strong sealing performance according to claim 1, characterized in that: The top end of the first baffle plate (3) is fixedly connected to the top inner wall of the valve body (1), and the bottom end of the second baffle plate (4) is fixedly connected to the bottom inner wall of the valve body (1).

3. A gas valve with strong sealing performance according to claim 1, characterized in that: The inner cavity of the valve cover (2) is provided with a lifting thread which is threadedly connected to the valve stem (5).

4. A gas valve with strong sealing performance according to claim 1, characterized in that: A rotating disk (6) is provided at the top end of the valve stem (5).

5. A gas valve with strong sealing performance according to claim 1, characterized in that: A through hole (12) matching the diameter of the valve stem (5) is provided in the middle of the surface of the gasket (11), and the gasket (11) is arranged in a V-shaped structure at the periphery of the through hole (12).

6. A gas valve with strong sealing performance according to claim 1, characterized in that: The gasket (11) is made of polytetrafluoroethylene material.

7. A gas valve with strong sealing performance according to claim 1, characterized in that: A valve head sealing ring (8) is provided at the connection between the valve head (7) and the first baffle plate (3) and the second baffle plate (4).

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