Check valve

Abstract

The utility model relates to the technical field of check valves, and discloses a check valve which comprises a valve body, a valve cavity is formed in the valve body, one end of the valve cavity is communicated with an air inlet end, the other end of the valve cavity is communicated with an air outlet end, a sealing disc is arranged in the valve cavity, a ventilation disc is arranged behind the sealing disc, and the ventilation disc is arranged in the valve cavity. A limiting rod is installed on the side, facing the ventilation disc, of the sealing disc, a limiting plug is installed at the end, facing the ventilation disc, of the limiting rod, an air hole is formed in the ventilation disc, and a limiting hole is formed in one side of the air hole. The check valve is composed of the valve body, the sealing disc and the ventilation disc, when the backflow phenomenon occurs at the air outlet end, after backflow air pressure impacts the ventilation disc, the buffering effect is achieved under the buffering effect of the reset spring and the blocking effect of the ventilation disc, and in the process that the ventilation disc moves towards the sealing disc, the ventilation disc can not be blocked. Air flow circulates from the gap on the peripheral side of the valve cavity and the possibly exposed air holes, and therefore the air flow is dispersed and decompressed.

Description

TECHNICAL FIELD

[0001] The utility model relates to check valve technical field, concretely is a check valve. BACKGROUND

[0002] Check valve is a kind of automatic valve class that does not need manpower or other action operation, opens or closes valve by relying on the flow of pipeline medium itself, mainly to prevent the reverse flow of pipeline medium.

[0003] Gas check valve is often used when ventilating equipment, factory or indoor ventilation of building, and the working principle of gas check valve is based on the design of one-way valve, when the flow direction of gas is consistent with the flow direction of valve disc, the valve will open and allow gas to pass through, and when the flow direction of gas is opposite, the valve disc will close quickly, prevent gas backflow, prevent external contaminated gas from entering indoor, ensure indoor air quality.

[0004] However, when the backflow pressure of pipeline system changes greatly, it may cause the valve disc to be damaged due to pressure impact when the check valve is working, affecting the stability of the pipeline system. Therefore, the skilled person in the art provides a check valve to solve the problem raised in the background art. SUMMARY

[0005] In view of the deficiencies of the prior art, the utility model provides a check valve to solve the problem that when the backflow pressure of pipeline system changes greatly, it may cause the valve disc to be damaged due to pressure impact when the check valve is working, affecting the stability of the pipeline system.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a check valve, comprising a valve body, a valve cavity is formed in the valve body, an air inlet end is communicated with one end of the valve cavity, an air outlet end is communicated with the other end of the valve cavity, a sealing disc is arranged in the valve cavity, an air disc is arranged behind the sealing disc, a limiting rod is installed on one side of the sealing disc facing the air disc, a limiting plug is installed on one end of the limiting rod facing the air disc, an air hole is formed in the air disc, a limiting hole is formed on one side of the air hole, a supporting column is installed on the middle of one side of the air disc facing the sealing disc, and a return spring is arranged between the air disc and the sealing disc.

[0007] Preferably, the limiting rod is slidably inserted into the limiting hole and the air disc.

[0008] Preferably, the limiting plug is sealingly inserted into the air hole and the air disc.

[0009] Preferably, the return spring is sleeved with the limiting rod, one end of the return spring is connected with the air disc, the other end of the return spring is in abutting contact with the inner wall of the sealing disc, and when the gas backflows, the buffering effect of the return spring and the blocking effect of the air disc are formed.

[0010] Preferably, the support column is made of rubber material, and the support column is in pressure contact with the sealing disc.

[0011] Compared with the prior art, the check valve has the following beneficial effects:

[0012] Through the design, the check valve of the utility model is composed of a valve body, a sealing disc and a ventilation disc, when backflow occurs at the gas outlet end, the backflow pressure impacts the ventilation disc, and under the buffering of the reset spring and the blocking of the ventilation disc, a buffering effect is formed, in the process of the ventilation disc moving towards the sealing disc, the airflow flows through the gap on the side of the valve cavity and the possible exposed air holes, so that the airflow is dispersed and depressurized, the sealing disc is prevented from being damaged by the high backflow pressure directly impacting the sealing disc, and the problem of the stability of the pipeline system being affected is solved. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 is a perspective structural schematic view of a check valve provided by the embodiment of the application.

[0014] Figure 2 is a structural sectional view of a check valve provided by the embodiment of the application.

[0015] Figure 3 is a working structural sectional view of a check valve provided by the embodiment of the application.

[0016] Figure 4 is a structural schematic view of an air hole in a check valve provided by the embodiment of the application.

[0017] In the figure: 1, valve body; 101, valve cavity; 102, gas inlet end; 103, gas outlet end; 2, sealing disc; 201, limiting rod; 202, limiting plug; 3, ventilation disc; 301, limiting hole; 302, air hole; 303, reset spring; 304, support column. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0019] The utility model provides a technical scheme, a check valve, please refer to Figure 1 、 Figure 2, including the valve body 1, the valve cavity 101 is set in the valve body 1, the one end of the valve cavity 101 is communicated with the air inlet end 102, the other end of the valve cavity 101 is communicated with the air outlet end 103, please refer to Figure 3 、 Figure 4 , the sealing disc 2 is arranged in the valve cavity 101, the air disc 3 is arranged at the rear of the sealing disc 2, the side of the sealing disc 2 towards the air disc 3 is installed with the limit rod 201, the end of the limit rod 201 towards the air disc 3 is installed with the limit plug 202, the air hole 302 is set on the air disc 3, the limit hole 301 is set on the side of the air hole 302, the middle of the side of the air disc 3 towards the sealing disc 2 is installed with the support column 304, the reset spring 303 is arranged between the air disc 3 and the sealing disc 2.

[0020] Please refer to Figure 2 、 Figure 3 、 Figure 4 , the limit rod 201 is slidably inserted with the air disc 3 through the limit hole 301, the limit plug 202 is sealingly inserted with the air disc 3 through the air hole 302, the reset spring 303 is sleeved with the limit rod 201, one end of the reset spring 303 is connected with the air disc 3, the other end of the reset spring 303 is in abutting contact with the inner wall of the sealing disc 2, and when the gas backflows, the buffering of the reset spring 303 and the blocking of the air disc 3 form the buffering effect, the support column 304 is made of rubber material, the support column 304 is in abutting contact with the sealing disc 2, and when the gas backflows, the support column 304 is in abutting contact with the sealing disc 2, so that the sealing disc 2 is more closely connected with the air inlet end 102 port.

[0021] The check valve in the utility model is composed of the valve body 1, the sealing disc 2 and the air disc 3, the valve cavity 101 is set in the valve body 1, the one end of the valve cavity 101 is communicated with the air inlet end 102, the other end of the valve cavity 101 is communicated with the air outlet end 103, the sealing disc 2 is arranged on the side of the valve cavity 101 close to the air inlet end 102, and the air disc 3 is arranged on the side of the valve cavity 101 close to the air outlet end 103, the limit rod 201 is installed on the side of the sealing disc 2 towards the air disc 3, the limit plug 202 is installed on the end of the limit rod 201 close to the air disc 3, the limit rod 201 is slidably inserted with the limit hole 301 on the air disc 3, and the limit plug 202 is inserted with the air hole 302, the reset spring 303 is sleeved on the circumferential side of the limit rod 201, one end of the reset spring 303 is connected with the inner wall of the air disc 3, and the other end of the reset spring 303 is in abutting contact with the inner wall of the sealing disc 2.

[0022] When the valve cavity 101 is inhaled, the sealing disc 2 is pressed and moves to the air disc 3 under the pressure of the air pressure, and in the moving process, the sealing disc 2 is in contact with the support column 304 on the inner side of the air disc 3, thereby limiting the sealing disc 2, when the sealing disc 2 is pressed to contact the support column 304, the limiting plug 202 is separated from the blockage of the air hole 302 on the air disc 3 under the movement of the limiting rod 201, so that the air flow flows from the air hole 302 after passing through the air inlet end 102, the valve cavity 101 and the air outlet end 103;

[0023] When the backflow phenomenon occurs at the air outlet end 103, the backflow air pressure impacts the air disc 3, and under the buffering of the reset spring 303 and the blocking of the air disc 3, the buffering effect is formed, in the process that the air disc 3 moves to the sealing disc 2, the air flow flows from the gap on the side of the valve cavity 101 and the possible exposed air hole 302, thereby dispersing the air flow and relieving the pressure, avoiding the damage of the sealing disc 2 caused by the high backflow air pressure directly impacting on the sealing disc 2, and solving the problem of the influence of the stability of the pipeline system.

[0024] It should be noted that in this paper, unless otherwise specified and limited, the terms "installation", "setting", "connection", "fixing", "screw connection" and the like should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, it can be the communication between two elements or the interaction relationship between two elements, unless otherwise specified, the above-mentioned terms in the utility model can be understood according to the specific meaning in the utility model by those skilled in the art.

[0025] Although the embodiments of the utility model have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A check valve comprising a valve body (1), characterized in that: The valve body (1) is provided with a valve cavity (101), one end of the valve cavity (101) is communicated with an air inlet end (102), the other end of the valve cavity (101) is communicated with an air outlet end (103), the valve cavity (101) is provided with a sealing disc (2), the rear of the sealing disc (2) is provided with a ventilation disc (3), the side of the sealing disc (2) facing the ventilation disc (3) is provided with a limiting rod (201), one end of the limiting rod (201) facing the ventilation disc (3) is provided with a limiting plug (202), the ventilation disc (3) is provided with a gas hole (302), one side of the gas hole (302) is provided with a limiting hole (301), the middle of the side of the ventilation disc (3) facing the sealing disc (2) is provided with a supporting column (304), the ventilation disc (3) and the sealing disc (2) are provided with a reset spring (303).

2. A check valve according to claim 1, wherein: The limiting rod (201) is slidably inserted into the limiting hole (301) and the ventilation disc (3).

3. A check valve according to claim 1, wherein: The limiting plug (202) is sealingly inserted into the gas hole (302) and the ventilation disc (3).

4. A check valve according to claim 1, wherein: The reset spring (303) is sleeved with the limiting rod (201).

5. A check valve according to claim 1, wherein: One end of the reset spring (303) is connected with the ventilation disc (3), and the other end of the reset spring (303) is in abutting contact with the inner wall of the sealing disc (2).

6. A check valve according to claim 1, wherein: The supporting column (304) is made of rubber.

7. A check valve according to claim 1 wherein: The supporting column (304) is in abutting contact with the sealing disc (2).

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