Gas circuit switching valve

Abstract

According to the gas path switching valve, even if the gas path switching valve is in a closed state, gas of a main gas path can be always kept in a circulating state when a sample tube is replaced, so that gas circulation is kept, the influence of gas pressure on a pipeline is reduced, and it is guaranteed that the gas can normally circulate after the sample tube is replaced. The connecting valve is characterized in that a gas inlet, a gas outlet, a sample pipeline gas outlet and a sample pipeline gas inlet are formed in a connecting valve body, the gas inlet, the gas outlet, the sample pipeline gas outlet and the sample pipeline gas inlet are communicated, and the gas inlet and the gas outlet are formed in one side of the connecting valve body; the sample pipeline air outlet and the sample pipeline air inlet are formed in the other side of the connecting valve body and connected through a pipeline, the movable valve element is movably connected into the connecting valve body, the sealing ring is arranged on the movable valve element, and the limiting pieces are arranged on the two sides of the movable valve element.

Description

Technical Field

[0001] The present application relates to the technical field of switching valves, and in particular to a gas path switching valve. Background Art

[0002] The switching valve is a commonly used control element, and its function is to switch the fluid medium between different pipelines. The switching valve mainly includes several aspects such as valve body, valve, valve seat and drive device. The switching valve is widely used in the metallurgical industry, chemical industry, pharmaceutical industry and gas industry. Among them, when the existing switching valve used for the gas circuit switches the sample gas circuit, the gas in the entire gas circuit will be in a closed state and cannot be circulated. At this time, the switching valve will be affected by the gas pressure and the gas will be compressed. If the gas pressure is too high, it may cause damage to the gas pipeline connected to the gas circuit switching valve, thereby affecting the subsequent gas circulation. Utility Model Content

[0003] In order to solve the above technical problems, the present application provides a gas path switching valve.

[0004] The technical solution provided in this application is described below:

[0005] The present application provides a gas path switching valve, comprising: a movable valve core, a sealing ring, a limit piece and a connecting valve body;

[0006] The connecting valve body is provided with an air inlet, an air outlet, a sample pipeline air outlet and a sample pipeline air inlet, the air inlet, the air outlet, the sample pipeline air outlet and the sample pipeline air inlet are connected, the air inlet and the air outlet are arranged on one side of the connecting valve body, the sample pipeline air outlet and the sample pipeline air inlet are arranged on the other side of the connecting valve body, the sample pipeline air outlet and the sample pipeline air inlet are connected by a pipeline, the movable valve core is movably connected in the connecting valve body, the sealing ring is arranged on the movable valve core, and the limit plates are arranged on both sides of the movable valve core; when the air circuit switching valve is in a closed state, the air inlet is connected with the air outlet, and when the air circuit switching valve is in an open state, the air inlet, the sample pipeline air inlet, the sample pipeline air outlet and the air outlet are connected in sequence.

[0007] Optionally, a first protrusion, a second protrusion and a third protrusion are provided on the movable valve core, a first flow area is formed between the first protrusion and the second protrusion, a second flow area is formed between the second protrusion and the third protrusion, and an area of ​​the first flow area is greater than an area of ​​the second flow area.

[0008] Optionally, a receiving area is provided on each of the first bump, the second bump and the third bump, and the sealing ring is installed in the receiving area.

[0009] Optionally, a flow pipe is provided on the connecting valve body, the air inlet, the air outlet, the sample pipe air outlet and the sample pipe air inlet are all in flow with the flow pipe, and the movable valve core is movably installed in the flow pipe.

[0010] Optionally, the first protrusion, the second protrusion and the third protrusion are fitted with the flow pipe in a clearance fit.

[0011] Optionally, the sealing ring and the circulation pipe are connected in a sealed manner.

[0012] Optionally, the limiting plate and the movable valve core are connected in a detachable manner.

[0013] Optionally, the cross-sectional area of ​​the limiting piece is larger than the cross-sectional area of ​​the flow pipe.

[0014] Optionally, the distance between the air inlet and the air outlet is set to a first value, and the distance between the air outlet of the sample pipe and the air inlet of the sample pipe is set to a second value.

[0015] Optionally, the second value is greater than the first value.

[0016] It can be seen from the above technical solutions that this application has the following advantages:

[0017] The air path switching valve of the present application is provided with a movable valve core, a sealing ring, a limit plate and a connecting valve body; wherein, the connecting valve body is provided with an air inlet, an air outlet, a sample pipeline air outlet and a sample pipeline air inlet, the air inlet, the air outlet, the sample pipeline air outlet and the sample pipeline air inlet are connected, the air inlet and the air outlet are arranged on one side of the connecting valve body, the sample pipeline air outlet and the sample pipeline air inlet are arranged on the other side of the connecting valve body, the sample pipeline air outlet and the sample pipeline air inlet are connected by a pipeline, the movable valve core is movably connected in the connecting valve body, the sealing ring is arranged on the movable valve core, and the limit plates are arranged on both sides of the movable valve core.

[0018] When the gas circuit switching valve is in a closed state, the air inlet is connected to the air outlet; when the gas circuit switching valve is in an open state, the air inlet, the air inlet of the sample pipe, the air outlet of the sample pipe and the air outlet are connected in sequence. It can be seen that even if the gas circuit switching valve is in a closed state, the gas in the main gas circuit can always be kept in a flowing state when the sample tube is replaced, thereby maintaining the circulation of the gas, reducing the impact of the gas pressure on the pipeline, and ensuring that the gas can circulate normally after the sample tube is replaced. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solution in the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 This is a schematic diagram of the open state of the gas circuit switching valve in this application;

[0021] Figure 2 This is a schematic diagram of the closed state of the gas circuit switching valve of this application;

[0022] In the figure: 1. movable valve core; 2. connecting valve body; 3. third protrusion; 4. sample pipe air outlet; 5. second protrusion; 6. first flow area; 7. sample pipe air inlet; 8. limit plate; 9. first protrusion; 10. air inlet; 11. air outlet; 12. second flow area; 13. sealing ring. DETAILED DESCRIPTION

[0023] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inside", "outside", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only used to illustrate the relative positional relationships between the various components or components, and do not particularly limit the specific installation orientations of the various components or components.

[0024] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0025] In addition, the terms "installed", "set", "provided with", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0026] In addition, the structures, proportions, sizes, etc. drawn in the drawings in the present application are only used to match the contents disclosed in the specification for the technical personnel in this field to understand and read, and are not used to limit the restrictive conditions under which the present application can be implemented. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in the present application without affecting the effects and purposes that can be achieved by the present application.

[0027] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0028] When the existing switching valve used for the gas circuit switches the sample gas circuit, the gas in the entire gas circuit will be in a closed state and cannot flow. At this time, the switching valve will be affected by the pressure of the gas and the gas will be compressed. If the gas pressure is too high, it may cause damage to the gas pipeline connected to the gas circuit switching valve, thereby affecting the subsequent gas circulation.

[0029] Based on this, the present application provides a gas circuit switching valve, which can keep the gas in the main gas circuit in a flowing state even if the gas circuit switching valve is in a closed state when replacing the sample tube, thereby maintaining the circulation of the gas, reducing the impact of the gas pressure on the pipeline, and ensuring that the gas can circulate normally after replacing the sample tube.

[0030] See also Figure 1 to Figure 2 , the present application provides a gas path switching valve, comprising: a movable valve core 1, a sealing ring 13, a limit piece 8 and a connecting valve body 2;

[0031] The connecting valve body 2 is provided with an air inlet 10, an air outlet 11, a sample pipeline air outlet 4 and a sample pipeline air inlet 7, the air inlet 10, the air outlet 11, the sample pipeline air outlet 4 and the sample pipeline air inlet 7 are connected, the air inlet 10 and the air outlet 11 are arranged on one side of the connecting valve body 2, the sample pipeline air outlet 4 and the sample pipeline air inlet 7 are arranged on the other side of the connecting valve body 2, the sample pipeline air outlet 4 and the sample pipeline air inlet 7 are connected by a pipeline, the movable valve core 1 is movably connected in the connecting valve body 2, the sealing ring 13 is arranged on the movable valve core 1, and the limiting piece 8 is arranged on both sides of the movable valve core 1; when the gas circuit switching valve is in a closed state, the air inlet 10 is connected with the air outlet 11, and when the gas circuit switching valve is in an open state, the air inlet 10, the sample pipeline air inlet 7, the sample pipeline air outlet 4 and the air outlet 11 are connected in sequence.

[0032] In the embodiment of the present application, the connecting valve body 2 is provided with an air inlet 10, an air outlet 11, a sample pipe air outlet 4, a sample pipe air inlet 7 and a circulation pipe, and the air inlet 10, the air outlet 11, the sample pipe air outlet 4 and the sample pipe air inlet 7 are all in circulation with the circulation pipe, and the movable valve core 1 is movably installed in the circulation pipe, wherein the limit plate 8 can be detachably installed at both ends of the movable valve core 1, and the limit plate 8 is used to limit the movable distance of the movable valve core 1 inside the connecting valve body 2, and thereby determine the open or closed state of the gas circuit switching valve. Pipes are installed at the air outlet 11, the air inlet 10, the sample pipe air outlet 4 and the sample pipe air inlet 7, and the sample pipe air outlet 4 and the sample pipe air inlet 7 are connected by a pipe.

[0033] The movable valve core 1 is provided with a first protrusion 9, a second protrusion 5 and a third protrusion 3, a first flow area 6 is formed between the first protrusion 9 and the second protrusion 5, a second flow area 12 is formed between the second protrusion 5 and the third protrusion 3, and the area of ​​the first flow area 6 is greater than the area of ​​the second flow area 12. The first protrusion 9, the second protrusion 5 and the third protrusion 3 are all provided with an accommodation area, and a sealing ring 13 is installed in the accommodation area.

[0034] In actual application, when it is necessary to switch the gas circuit, first close the gas circuit switching valve. In this state, the air inlet 10 and the air outlet 11 are in a flow state, that is, the gas in the gas circuit enters from the air inlet 10, flows through the first flow area 6 and then flows out from the air outlet 11. The sample pipe air outlet 4 and the sample pipe air inlet 7 are in a closed state, and there is no gas flow on the sample pipe air outlet 4 and the sample pipe air inlet 7, so that it is convenient to replace the corresponding sample pipe, and the gas in the main gas circuit can be in a flow state, thereby reducing the impact of gas pressure on the pipeline.

[0035] After the sample pipeline is replaced, the movable valve core 1 is controlled to move inside the connecting valve body 2 and switched to the open state of the gas path switching valve. In this state, the air inlet 10 is connected to the air inlet 7 of the sample pipeline, the air outlet 11 is connected to the air outlet 4 of the sample pipeline, the air outlet 4 of the sample pipeline is connected to the air inlet 7 of the sample pipeline, and the air outlet 4 of the sample pipeline is connected to the air inlet 7 of the sample pipeline, and the air outlet 4 of the sample pipeline is connected to the air inlet 7 of the sample pipeline through a pipeline. In actual application, the gas enters the first circulation area 6 from the air inlet 10, and the gas enters the air inlet 7 of the sample pipeline after flowing through the first circulation area 6, and flows into the air outlet 4 of the sample pipeline through the pipeline, and flows out from the air outlet 11 after passing through the second circulation area 12, so that the sample in the sample pipeline can be blown out and subsequent detection can be carried out.

[0036] Among them, the first protrusion 9, the second protrusion 5 and the third protrusion 3 are matched with the circulation pipeline in a clearance fit, so that the movable valve core 1 can move back and forth in the circulation pipeline, and the connection matching mode of the sealing ring 13 and the circulation pipeline is a sealed connection. The sealing ring 13 can be distinguished into a first circulation area 6 and a second circulation area 12. The first circulation area 6 and the second circulation area 12 are not interconnected. The first circulation area 6 and the second circulation area 12 are connected through a pipeline connected by the sample pipeline outlet 4 and the sample pipeline inlet 7.

[0037] Among them, the cross-sectional area of ​​the limiting plate 8 is larger than the cross-sectional area of ​​the flow pipe, so that the limiting effect can be achieved, and the distance between the air inlet 10 and the air outlet 11 is set to a first value, and the distance between the sample pipe air outlet 4 and the sample pipe air inlet 7 is set to a second value, and the second value is greater than the first value. The specific values ​​of the first value and the second value can be set according to actual conditions and are not limited here.

[0038] It should be noted that the above description of the disclosed embodiments enables professionals and technicians in the field to implement or use the present application. Various modifications to these embodiments will be apparent to professionals and technicians in the field, and the general principles defined herein can be implemented in other embodiments without departing from the scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but should conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A gas circuit switching valve, characterized in that: include: Movable valve core, sealing ring, limit plate and connecting valve body; The connecting valve body is provided with an air inlet, an air outlet, a sample pipeline air outlet and a sample pipeline air inlet, the air inlet, the air outlet, the sample pipeline air outlet and the sample pipeline air inlet are connected, the air inlet and the air outlet are arranged on one side of the connecting valve body, the sample pipeline air outlet and the sample pipeline air inlet are arranged on the other side of the connecting valve body, the sample pipeline air outlet and the sample pipeline air inlet are connected through a pipeline, the movable valve core is movably connected in the connecting valve body, the sealing ring is arranged on the movable valve core, and the limit plates are arranged on both sides of the movable valve core; When the gas circuit switching valve is in a closed state, the air inlet is connected to the air outlet, and when the gas circuit switching valve is in an open state, the air inlet, the sample pipeline air inlet, the sample pipeline air outlet and the air outlet are connected in sequence.

2. The gas path switching valve according to claim 1, characterized in that: The movable valve core is provided with a first protrusion, a second protrusion and a third protrusion, a first flow area is formed between the first protrusion and the second protrusion, a second flow area is formed between the second protrusion and the third protrusion, and the area of ​​the first flow area is greater than the area of ​​the second flow area.

3. The gas path switching valve according to claim 2, characterized in that: The first bump, the second bump and the third bump are each provided with an accommodation area, and the sealing ring is installed in the accommodation area.

4. The gas path switching valve according to claim 2, characterized in that: The connecting valve body is provided with a flow pipeline, the air inlet, the air outlet, the sample pipeline air outlet and the sample pipeline air inlet are all in flow with the flow pipeline, and the movable valve core is movably installed in the flow pipeline.

5. The gas path switching valve according to claim 4, characterized in that: The first protrusion, the second protrusion and the third protrusion are matched with the flow pipe in a clearance fit.

6. The gas path switching valve according to claim 5, characterized in that: The sealing ring and the circulation pipe are connected in a sealed manner.

7. The gas path switching valve according to claim 4, characterized in that: The connection between the limiting plate and the movable valve core is detachable.

8. The gas path switching valve according to claim 7, characterized in that: The cross-sectional area of ​​the limiting piece is larger than the cross-sectional area of ​​the flow pipe.

9. The gas path switching valve according to claim 1, characterized in that: The distance between the air inlet and the air outlet is set to a first value, and the distance between the air outlet of the sample pipeline and the air inlet of the sample pipeline is set to a second value.

10. The gas path switching valve according to claim 9, characterized in that: The second value is greater than the first value.

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