One-way valve and pneumatic control pipeline

Abstract

The utility model relates to the technical field of valves, and provides a one-way valve and a pneumatic control pipeline, the one-way valve comprises a valve body and a valve core assembly, the air outlet end of the valve body is provided with an overflow leakage structure, the overflow leakage structure comprises an overflow leakage cylinder, a sealing plug and an elastic piece, and the overflow leakage cylinder is fixedly connected to the valve body; an overflow leakage inlet communicated with the interior of the valve body and an overflow leakage outlet communicated with the outside are formed in the valve body; the sealing plug and the elastic piece are arranged in the overflow leakage cylinder, and the overflow leakage cylinder is provided with a sealing step used for being matched with the sealing plug. When the one-way valve is opened, the sealing plug compresses the elastic piece and abuts against the sealing step to form a sealing pair under the action of air pressure, and an air path between the overflow leakage inlet and the overflow leakage outlet is closed. And when the one-way valve leaks inwards, the sealing plug is far away from the sealing step under the action of the elastic piece and communicates with an air path between the overflow leakage inlet and the overflow leakage outlet. The one-way valve can prevent the pneumatic valve at the downstream of the one-way valve from malfunctioning.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a one-way valve and a pneumatic control pipeline. Background Art

[0002] When a one-way valve is used in a gas circuit, it controls the one-way flow of gas and prevents backflow. Due to the limitation of manufacturing process, the seal between the valve core and the valve body of the one-way valve cannot be absolutely sealed. During use, a small amount of gas will leak from the upstream to the downstream. At the same time, when the upstream pressure is about to reach the opening pressure of the one-way valve, the gas leaking into the downstream will increase. The phenomenon of upstream gas leaking into the downstream during use and when the upstream pressure is about to reach the opening pressure of the one-way valve is collectively referred to as internal leakage.

[0003] Generally speaking, when a one-way valve is used in an ordinary gas circuit, the internal leakage of the one-way valve will not have much impact on the downstream gas circuit components (depending on the different operating conditions, the national standard also allows different degrees of internal leakage). However, when the one-way valve is used in an air-driven control pipeline that drives the opening and closing of an air-driven valve, for example, in the energy-saving system with the publication number "CN115614657A" and "CN220436241U" applied for by the applicant, if internal leakage occurs, it will cause the pressure between the outlet of the one-way valve and the driving air inlet of the pneumatic valve to gradually increase, thereby causing the starting valve to operate prematurely (i.e., malfunction), thereby causing disorder in the energy-saving system. Therefore, it is particularly important to provide a one-way valve to solve this problem. Utility Model Content

[0004] The utility model aims to provide a one-way valve and a pneumatic control pipeline to prevent a start valve downstream of the one-way valve from malfunctioning.

[0005] The embodiments of the present invention are implemented by the following technical solutions:

[0006] A one-way valve comprises a valve body and a valve core assembly, wherein the gas outlet end of the valve body is provided with a leakage structure, the leakage structure comprises a leakage tube, a sealing plug and an elastic member, the leakage tube is fixedly connected to the valve body and is provided with a leakage inlet communicating with the inside of the valve body and a leakage outlet communicating with the outside;

[0007] The sealing plug and the elastic member are arranged inside the overflow cylinder, and the overflow cylinder is provided with a sealing step for cooperating with the sealing plug; when the one-way valve is opened, the sealing plug compresses the elastic member under the action of air pressure, and abuts against the sealing step to form a sealing pair, thereby closing the air path between the overflow inlet and the overflow outlet; when the one-way valve leaks internally, under the action of the elastic member, the sealing plug moves away from the sealing step, thereby connecting the air path between the overflow inlet and the overflow outlet.

[0008] Optionally, a limit platform is provided in the leakage cylinder, the limit platform is arranged on a side of the sealing plug away from the sealing step, and the limit platform is provided with a vent hole.

[0009] Optionally, the limiting platform is provided with a guide hole, and the sealing plug cooperates with the limiting hole.

[0010] Optionally, a sealing gasket is provided on the surface of the sealing plug contacting the sealing step.

[0011] Optionally, the elastic member is a spring.

[0012] The utility model also provides a pneumatic control pipeline, comprising a pipeline main body, on which any one of the above-mentioned one-way valves is arranged, and a pneumatic valve is arranged downstream of the one-way valve.

[0013] The technical solution of the utility model has at least the following advantages and beneficial effects: in the utility model, under the action of the elastic member, the sealing plug is away from the sealing step, and the air path between the overflow inlet and the overflow outlet is in a connected state, so that the gas leaked from the one-way valve to the outlet end can be discharged from the overflow outlet, avoiding the pressure between the one-way valve and the pneumatic valve to gradually increase, thereby causing the pneumatic valve to work in advance, that is, preventing the pneumatic valve from malfunctioning; and when the one-way valve is opened, the pressure at the outlet end increases, pressing the sealing plug against the sealing step, closing the air path between the overflow inlet and the overflow outlet, and ensuring the normal operation of the pneumatic valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments 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.

[0015] Figure 1 A schematic diagram of the structure of a one-way valve provided in the first embodiment;

[0016] Figure 2 It is an enlarged view of the leakage structure (the gas path between the leakage inlet and the leakage outlet is connected);

[0017] Figure 3 It is an enlarged view of the leakage structure (the gas path between the leakage inlet and the leakage outlet is closed);

[0018] Figure 4 A schematic diagram of a pneumatic control pipeline provided in the first embodiment;

[0019] Icons: 1- one-way valve, 101- valve body, 102- valve core assembly, 2- overflow structure, 201- overflow cylinder, 201a- overflow inlet, 201b- overflow outlet, 201c- sealing step, 202- sealing plug, 203- elastic part, 204- limit platform, 204a- vent hole, 204b- guide hole, 205- sealing gasket, 3- pipeline body, 4- pneumatic valve. DETAILED DESCRIPTION

[0020] Embodiment 1

[0021] refer to Figure 1 This embodiment provides a one-way valve, including a valve body 101 and a valve core assembly 102. Those skilled in the art should understand that the working principle of the one-way valve 1 is that when the pressure difference between the air inlet end and the air outlet end reaches a certain value, the valve opens. This application is improved on the above basis.

[0022] In this application, the gas outlet end of the valve body 101 is provided with a leakage structure 2, referring to Figure 2 and Figure 3 The leakage structure 2 includes a leakage tube 201, a sealing plug 202 and an elastic member 203. The leakage tube 201 is provided with a leakage inlet 201a connected to the inside of the valve body 101 and a leakage outlet 201b connected to the outside. The leakage tube 201 is fixedly connected to the valve body 101. There is no limitation on the fixed connection method, such as welding, threaded connection, and flange connection. It is easy to understand that the connection between the leakage tube 201 and the valve body 101 should be sealed.

[0023] The sealing plug 202 and the elastic member 203 are arranged inside the leakage tube 201, and the leakage tube 201 is provided with a sealing step 201c for cooperating with the sealing plug 202; in this way, under the action of the elastic member 203, the sealing plug 202 is away from the sealing step 201c, and the gas path between the leakage inlet 201a and the leakage outlet 201b is in a connected state, so that the gas leaked from the one-way valve 1 to the outlet end can be discharged from the leakage outlet 201b, avoiding the gradual increase of the pressure between the one-way valve 1 and the pneumatic valve 4, thereby causing the pneumatic valve 4 to be actuated. 4 works in advance, that is, it prevents the pneumatic valve 4 from malfunctioning; and when the one-way valve 1 is opened, the pressure at the outlet end increases, pressing the sealing plug 202 to the sealing step 201c, closing the gas path between the overflow inlet 201a and the overflow outlet 201b (it should be understood that the flow rate of the overflow outlet 201b should be much smaller than the overflow inlet 201a, so as to ensure that when the one-way valve 1 is opened, the gas path between the overflow inlet 201a and the overflow outlet 201b can be successfully closed), so that all the gas enters the pneumatic valve 4, ensuring the normal operation of the pneumatic valve 4.

[0024] In addition, it is worth mentioning that after the internal leakage of a conventional one-way valve causes the pressure between the one-way valve 1 and the pneumatic valve 4 to gradually increase, when the valve is opened, the air inlet end of the valve requires a higher pressure input pressure to achieve the pressure difference that keeps the valve continuously open, which leads to a decrease in the valve control accuracy. The one-way valve 1 provided in the present application can discharge the internal leakage gas through the overflow structure 2, which effectively solves the above problem and improves the valve control accuracy.

[0025] The surface of the sealing plug 202 contacting the sealing step 201c is provided with a sealing gasket 205 to ensure the sealing performance of the sealing pair.

[0026] A limiting platform 204 is provided in the leakage cylinder 201. The limiting platform 204 is provided on the side of the sealing plug 202 away from the sealing step 201c. The limiting platform 204 is provided with a vent hole 204a. The limiting platform 204 limits the position of the sealing plug 202. Furthermore, the limiting platform 204 is provided with a guide hole 204b. The sealing plug 202 cooperates with the limiting hole. Such a setting provides a guide for the sealing plug 202 to prevent the elastic member 203 from being bent. It should be understood that there should be a gap between the sealing plug 202 and the limiting platform 204 to ensure that the airflow can circulate.

[0027] The elastic member 203 is a spring. Of course, other elements that can be compressed and restored can also be used in other embodiments.

[0028] Embodiment 2

[0029] refer to Figure 4 The present embodiment provides a pneumatic control pipeline, including a pipeline body 3, on which is provided a one-way valve 1 provided in the first embodiment, and a pneumatic valve 4 is provided downstream of the one-way valve 1. The pneumatic valve 4 is a valve driven to open or close by gas, such as a cryogenic valve driven by oxygen provided in the patent with publication number "CN219035580U" applied by the applicant.

[0030] Embodiment 3

[0031] This embodiment provides a method for preventing the pneumatic valve 4 from malfunctioning. The one-way valve in the pneumatic control pipeline of the pneumatic valve 4 adopts the one-way valve 1 provided in the first embodiment. That is, in this method, the leakage structure 2 provided in the first embodiment is designed on the valve body 101 of the one-way valve 1, so that the internal leakage gas of the one-way valve 1 is discharged through the leakage structure 2, so as to avoid the continuous increase of the pipeline pressure between the one-way valve 1 and the pneumatic valve 4 before the pneumatic valve 4 reaches the working time, thereby preventing the pneumatic valve 4 from operating in advance, that is, this method prevents the pneumatic valve 4 from malfunctioning. At the same time, when the one-way valve 1 is opened, the leakage structure 2 is closed under the action of air pressure to ensure the normal operation of the pneumatic valve 4.

[0032] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A one-way valve, comprising a valve body (101) and a valve core assembly (102), characterized in that: The gas outlet end of the valve body (101) is provided with a leakage structure (2), the leakage structure (2) comprising a leakage tube (201), a sealing plug (202) and an elastic member (203), the leakage tube (201) is fixedly connected to the valve body (101), and is provided with a leakage inlet (201a) communicating with the interior of the valve body (101) and a leakage outlet (201b) communicating with the outside; The sealing plug (202) and the elastic member (203) are arranged inside the leakage tube (201), and the leakage tube (201) is provided with a sealing step (201c) for cooperating with the sealing plug (202); when the one-way valve (1) is opened, the sealing plug (202) compresses the elastic member (203) under the action of air pressure and abuts against the sealing step (201c) to form a sealing pair, thereby closing the air path between the leakage inlet (201a) and the leakage outlet (201b); when the one-way valve (1) leaks internally, under the action of the elastic member (203), the sealing plug (202) moves away from the sealing step (201c) and connects the air path between the leakage inlet (201a) and the leakage outlet (201b).

2. The one-way valve according to claim 1, characterized in that: A limiting platform (204) is provided in the leakage cylinder (201), the limiting platform (204) is provided on a side of the sealing plug (202) away from the sealing step (201c), and the limiting platform (204) is provided with a vent hole (204a).

3. The one-way valve according to claim 2, characterized in that: The limiting platform (204) is provided with a guide hole (204b), and the sealing plug (202) cooperates with the limiting hole.

4. The one-way valve according to claim 1, characterized in that: A sealing gasket (205) is provided on the surface of the sealing plug (202) that contacts the sealing step (201c).

5. The one-way valve according to claim 1, characterized in that: The elastic member (203) is a spring.

6. A pneumatic control pipeline, characterized in that: The invention comprises a pipeline body (3), on which a one-way valve (1) as claimed in any one of claims 1 to 5 is arranged, and a pneumatic valve (4) is arranged downstream of the one-way valve (1).

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