A one-way valve with corrosion resistance that achieves one-way conduction

Abstract

The present invention discloses a one-way valve with corrosion resistance and one-way conduction, which comprises an inlet end valve body, an outlet end valve body and a one-way control component. The one-way control component includes a sealing platform, a spring and a hollow gasket assembled in the communication groove of the inlet end valve body. The outer surface of the spring is wrapped with an anti-corrosion sleeve. A "convex" shaped protrusion is arranged on the side of the sealing platform facing the spring. The hollow gasket is positioned and assembled on the protrusion by sleeving on the protruding part of the protrusion, and a flow space is formed between the hollow gasket and the sealing platform. Both ends of the spring abut between the hollow gasket and the bottom wall of the insertion groove of the outlet end valve body. By wrapping the outer surface of the spring with an anti-corrosion sleeve, the present invention prevents the spring from being corroded and prolongs the service life of the spring. Also, by designing the flow space, even if the spring forms a cylinder due to pressure, a closed space will not be formed between the spring and the sealing platform, completely solving the problem of liquid blockage or the problem of excessive gas pressure.

Description

Technical Field

[0001] The present invention relates to a check valve, and more particularly to a corrosion-resistant check valve that prevents liquid blockage or excessive gas pressure and realizes one-way conduction. Background Art

[0002] A check valve is a valve in which fluid can only flow along the inlet, and the medium at the outlet cannot flow back. It is commonly known as a check valve, also known as a non-return valve or a reflux valve. This check valve has functions such as corrosion resistance and resistance to strong acids and alkalis, and is used in hydraulic systems to prevent reverse liquid flow, or in gas pipeline systems to prevent reverse flow of compressed air. In order to facilitate the installation of the internal one-way control component, the check valve is generally designed as a split structure with an inlet-end valve body and an outlet-end valve body. A hollow chamber is formed in the inlet-end valve body and the outlet-end valve body, and an air inlet and an air outlet communicating with the cavity are respectively opened in the inlet-end valve body and the outlet-end valve body. The air inlet and the air outlet are used to connect different pipelines respectively. The spring of the one-way control component is controlled by the pressure difference between the inlet and the outlet to drive the movement of the sealing platform of the one-way control component, so as to drive the sealing platform to open or close the inlet, so as to control the flow, flow rate, speed, etc. of the gas. When the air inlet is opened, the medium enters the intermediate chamber along the inlet, flows through the inside of the valve body along the intermediate chamber, and then is discharged from the outlet.

[0003] At present, the gases and liquids after processing in the semiconductor processing and solar photovoltaic industries are mostly corrosive. Ordinary check valves cannot meet the requirements. The springs are extremely easy to corrode, and the cooperation mode with the sealing platform is also easy to cause liquid blockage or excessive gas pressure. Summary of the Invention

[0004] In view of this, in order to solve the technical problems that the traditional check valve has a low service life due to corrosion, and is easy to cause liquid blockage or excessive gas pressure, the present invention provides a corrosion-resistant check valve that realizes one-way conduction.

[0005] The present invention is implemented by the following technical solutions: A corrosion-resistant check valve that realizes one-way conduction, which includes:

[0006] An inlet-end valve body, the output end of which is provided with a communication groove communicating with a valve path one in the inlet-end valve body;

[0007] An outlet-end valve body, the input end of which is provided with a plug-in groove communicating with a valve path two in the outlet-end valve body. The plug-in groove is for the output end of the inlet-end valve body to be plugged and fixed, and the valve path one and the valve path two are communicated through the communication groove;

[0008] One-way control component, which includes a sealing platform and a spring assembled in a communication groove; the diameter of the sealing platform is smaller than that of the communication groove, and both ends of the spring abut between the sealing platform and the bottom wall of the insertion groove, and drive the sealing surface of the sealing platform to seal the inlet of the first valve path leading to the communication groove due to being in a stressed state. By increasing the pressure of the first valve path, the spring is further compressed, so that the spring drives the sealing surface to unseal the inlet of the first valve path leading to the communication groove;

[0009] Among them, the outer surface of the spring is wrapped with an anti-corrosion sleeve, and a convex-shaped protrusion is provided on the side of the sealing platform facing the spring. The one-way control component further includes a hollow gasket, and the hollow gasket is positioned and assembled on the protrusion by sleeving on the protruding part of the protrusion. A flow space is formed between the hollow gasket and the sealing platform; both ends of the spring abut between the hollow gasket and the bottom wall of the insertion groove.

[0010] As a further improvement of the above solution, the anti-corrosion sleeve is made of PTFE material, and / or the hollow gasket is made of PTFE material.

[0011] As a further improvement of the above solution, all components of the one-way valve that realizes one-way conduction with anti-corrosion property are made of high-purity polytetrafluoroethylene material.

[0012] As a further improvement of the above solution, the output end of the inlet-end valve body is inserted and fixed to the input end of the outlet-end valve body by threaded connection.

[0013] As a further improvement of the above solution, the sealing platform and the protrusion are of an integrally formed structure.

[0014] Furthermore, the protrusion and the hollow gasket are of an integrally formed structure.

[0015] As a further improvement of the above solution, a sealing ring coaxial with the inlet-end valve body is provided on the end face of the output end of the inlet-end valve body. When the inlet-end valve body and the outlet-end valve body are inserted and fixed, the sealing ring is inserted into the groove wall of the insertion groove.

[0016] As a further improvement of the above solution, a first buffer groove with a diameter larger than the diameter of the inlet is provided on the sealing surface.

[0017] Furthermore, a second buffer groove coaxial with the first valve path is provided on the bottom wall of the communication groove, and the diameter of the first buffer groove is larger than that of the second buffer groove.

[0018] As a further improvement of the above solution, the output end of the inlet-end valve body is inserted and fixed in the insertion groove by threaded connection.

[0019] Compared with the traditional one-way valve, the main advantages of the present invention are as follows:

[0020] (1) In the present invention, the outer surface of the spring is coated with a corrosion-resistant sleeve to prevent the spring from being corroded and extend the service life of the spring.

[0021] (2) The present invention also provides a hollow gasket and a "convex"-shaped protrusion to outline a flow space for the spring to flow into the second valve path after coming out. By designing the flow space, even when the spring is compressed into a cylindrical shape, a closed space will not be formed between the spring and the sealing table, completely solving the problem of liquid blockage or the problem of excessive gas pressure.

[0022] (3) The present invention also designs a first buffer groove to solve the technical problem of easy blockage of the pipeline (i.e., the second valve path) caused by impurities in the fluid. At the same time, more buffer space can be added through the second buffer groove to reduce the probability of blockage caused by impurities in the fluid.

[0023] (4) The present invention also improves the sealing performance between the inlet-end valve body and the outlet-end valve body through a sealing ring embedded in the groove wall of the socket. Especially when the inlet-end valve body and the outlet-end valve body are connected by screw insertion, the thread life of the inlet-end valve body and the outlet-end valve body can also be extended. Description of the Drawings

[0024] Figure 1 It is a cross-sectional view of a one-way valve with corrosion resistance and one-way conduction provided in this embodiment.

[0025] Figure 2 is Figure 1 a partial enlarged view of the lip and tongue structure of the one-way valve with corrosion resistance and one-way conduction in

[0026] Figure 3 is Figure 1 a cross-sectional view of the spring of the one-way valve with corrosion resistance and one-way conduction in

[0027] Figure 4 is Figure 1 a partial enlarged view of the one-way control component of the one-way valve with corrosion resistance and one-way conduction in Detailed Description of the Embodiment

[0028] In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention and are not used to limit the present invention.

[0029] Please refer to Figure 1, which is a cross-sectional view of a one-way valve that provides corrosion resistance and realizes one-way conduction according to an embodiment of the present invention. The one-way valve includes a valve body, two interfaces, and a one-way control component. The two interfaces are installed on the valve body and communicate with the valve path inside the valve body to provide inlets and outlets. The valve path allows liquids or gases to flow through, and both interfaces are used to connect to external pipes, realizing the connection between two external pipes through the valve body.

[0030] In the invention, the valve body is not a single component but a split component, including two components: an inlet-end valve body 8 and an outlet-end valve body 4. Therefore, in this embodiment, the valve body has a split structure, which is convenient for equipment maintenance work such as installation, inspection, and replacement.

[0031] The input end of the inlet-end valve body 8 is cylindrical and provided with external threads for screwing, which is used to screw the above-mentioned external pipe. The input end of the inlet-end valve body 8 constitutes the inlet end 86 of the one-way valve that provides corrosion resistance and realizes one-way conduction. The output end of the inlet-end valve body 8 is provided with a communication groove 82 that communicates with the valve path one 81 inside the inlet-end valve body 8. The communication groove 82, the valve path one 81, and the input end of the inlet-end valve body 8 are connected and coaxial. At the entrance where the valve path one 81 communicates with the communication groove 82, that is, on the bottom wall of the communication groove 82, a buffer groove one 73 with a diameter larger than the diameter of the entrance is provided. The bottom wall of the communication groove 82 is provided with a buffer groove two 85 that is coaxial with the valve path one 81, and the diameter of the buffer groove one 73 is larger than the diameter of the buffer groove two 85. The present invention solves the technical problem of easy blockage of the pipeline (i.e., the valve path two) caused by impurities in the fluid by designing the buffer groove one 73. At the same time, more buffer space can be increased through the buffer groove two 85, reducing the probability of blockage due to the presence of impurities in the fluid.

[0032] On the end face of the output end of the inlet-end valve body 8, a sealing ring 83 coaxial with the inlet-end valve body 8 can be provided. On the end face of the output end of the inlet-end valve body 8, an annular step 84 coaxial with the inlet-end valve body 8 can be provided, and the sealing ring 83 is fixed on the annular step 84. The sealing ring 83, the annular step 84, and the inlet-end valve body 8 can be an integrally formed structure.

[0033] The input end of the outlet-end valve body 4 is provided with a plug-in groove 42 that communicates with the valve path two 41 inside the outlet-end valve body 4. The plug-in groove 42 is for the output end of the inlet-end valve body 8 to be plugged and fixed. The output end of the inlet-end valve body 8 can be plugged and fixed in the plug-in groove 42 by means of threaded connection. The valve path one 81 and the valve path two 41 are connected through the communication groove 82. When the inlet-end valve body 8 and the outlet-end valve body 4 are plugged and fixed, the sealing ring 83 is inserted into the groove wall of the plug-in groove 42. The present invention improves the sealing performance between the inlet-end valve body 8 and the outlet-end valve body 4 through the sealing ring 83 embedded in the groove wall of the plug-in groove 42. Especially when threaded plugging is used between the inlet-end valve body 8 and the outlet-end valve body 4, the thread life of the inlet-end valve body 8 and the outlet-end valve body 4 can also be extended.

[0034] When the inlet valve body 8 is inserted and fixed to the outlet valve body 4, a circular relief groove 43 is formed at a position on the side wall of the insertion groove 42 opposite to the annular step 84. This is the relief space required for machining the thread. The output end of the inlet valve body 8 is inserted and fixed to the input end of the outlet valve body 4 through threaded connection.

[0035] Please combine Figure 2 , the output end of the outlet valve body 4 and the input end of the inlet valve body 8 can have the same design structure, or can be cylindrical and provided with external threads for screw connection. The output end of the outlet valve body 4 constitutes the outlet end 44 of the entire one-way valve. The insertion groove 42, the second valve path 41, and the input end of the outlet valve body 4 are connected and can be coaxial. At the end faces of the inlet end 86 and the outlet end 44, a first conical surface 45 that converges inward and is trumpet-shaped is provided near the inner wall.

[0036] Two interfaces are respectively installed on the inlet end 86 and the outlet end 44. Each interface includes a ferrule nut 1, a rear ferrule 2, and a front ferrule 3. The ferrule nut 1, the rear ferrule 2, the front ferrule 3, and the valve body are coaxially arranged. The front ferrule 3 and the rear ferrule 2 can be an integrally formed structure. One end inside the ferrule nut 1 has a first receiving channel 11, and the other end inside has a second receiving channel 12 that is coaxial and communicates with the first receiving channel 11. An internal thread for threaded connection with the inlet end 86 or the outlet end 44 is provided in the second receiving channel 12. The diameter of the second receiving channel 12 is longer than the diameter of the first receiving channel 11 for the inlet end 86 or the outlet end 44 to be inserted and fixed.

[0037] The front ferrule 3 is received in the second receiving channel 12, and the first receiving channel 11 communicates with the inlet end 86 or the outlet end 44 through the front ferrule 3. The front ferrule 3 and the outlet end of the outlet valve body 4 have a conical surface that slopes outward (described below), and a tapered opening is used to achieve sealing. One end of the front ferrule 3 is fixed to the bottom of the second receiving channel 12 and communicates with the first receiving channel 11. At the end face of the other end of the front ferrule 3, a second conical surface 31 that diverges outward and is trumpet-shaped is provided near the outer wall. The second conical surface 31 is used to be inserted into the inlet end 86 or the outlet end 44 for static sealing with the corresponding first conical surface 45. The direct static sealing design between the first conical surface 45 and the second conical surface 31 at the outlet end 44 can effectively prevent liquid or gas from leaking from the valve body, and can also effectively protect the threads of the connection between the interface and the valve body from corrosion. Therefore, the inlet valve body 8 and the outlet valve body 4 at both ends of the valve body are connected by threads, and a special lip and tongue structure is used to achieve the static sealing of the valve body.

[0038] The rear clamp 2 can also be not provided, but it is preferably provided to ensure the stability of the lip and tongue structure of the first conical surface 45 and the second conical surface 31 designed between the front clamp 3 and the inlet end 86. The rear clamp 2 is an open snap ring with internal threads. The rear clamp 2 is located in the second receiving channel 12 and between the front clamp 3 and the bottom of the second receiving channel 12. Internal threads for screwing an external pipeline can be provided in the rear clamp 2. The rear clamp 2 is fixed to the bottom of the second receiving channel 12 and communicates with the first receiving channel 11. The other end of the rear clamp 2 supports the front clamp 3, and the front clamp 3 communicates with the first receiving channel 11 through the rear clamp 2. The outer shape of the rear clamp 2 can be frustum-shaped, with the upper stage fixed to the bottom of the second receiving channel 12 and the lower stage supporting the front clamp 3. The outer diameter of the lower stage is preferably larger than the outer diameter of the front clamp 3.

[0039] One end of the second receiving channel 12 close to the first receiving channel 11 is a conical groove 13 that converges towards the first receiving channel 11. The conical groove 13 extends to the interface between the first receiving channel 11 and the second receiving channel 12. The diameter of one end of the rear clamp 2 close to the first receiving channel 11 is larger than the diameter of the first receiving channel 11, and it is fixed to the conical wall of the conical groove 13, and an interface space 14 is formed between the interface and the rear clamp 2.

[0040] The one-way control component includes a sealing platform 7, a spring 5, and a perforated gasket 6 assembled in the communication groove 82. The diameter of the sealing platform 7 is smaller than the diameter of the communication groove 82. Both ends of the spring 5 abut between the sealing platform 7 and the bottom wall of the insertion groove 42, and drive the sealing surface 71 of the sealing platform 7 to seal the inlet of the first valve path 81 leading to the communication groove 82 due to being in a stressed state. In this embodiment, the sealing platform 7 is a sealing component made of polytetrafluoroethylene material, and forms a surface seal with the bottom of the inlet end valve body 8. By increasing the pressure in the first valve path 81, the spring 5 is further compressed, so that the spring 5 drives the sealing surface 71 to unseal the inlet of the first valve path 81 leading to the communication groove 82.

[0041] Please refer to Figure 3, the outer surface of the spring 5 is wrapped with a corrosion-resistant sleeve 51. The sleeve 51 is wrapped outside the spring 5, and then the wrapping tubes at both ends of the spring are sealed. By wrapping the outer surface of the spring 5 with a corrosion-resistant sleeve 51, the present invention prevents the spring 5 from being corroded and extends the service life of the spring 5. In this embodiment, the spring 5 is a composite spring with a metal core and an outer PTFE coating. For example, the sleeve 51 is a PTFE pipe fitting with a thickness of 0.3 - 0.5 mm. When the spring 5 is compressed, the sleeve 51 keeps the spring 5 permanently isolated from the strongly corrosive material, thus playing a role in protecting the spring 5. When the spring 5 is compressed, the sleeve keeps the spring 5 permanently isolated from the strongly corrosive material, thus playing a role in protecting the spring 5. Due to the smoothness of the PTFE pipe fitting and the non-adhesiveness of the PTFE material, the problem of scale blockage in the gap between the material and the spring 5 is also solved. All parts of the one-way valve that come into contact with the valve body gas (liquid) can be made of special high-purity polytetrafluoroethylene material, which is acid-resistant, alkali-resistant, corrosion-resistant, and can withstand a high temperature of 200 °C.

[0042] Please combine with Figure 4 , on the side of the sealing table 7 facing the spring 5, there is a "convex"-shaped protrusion 72. The hollow gasket 6 is positioned and assembled on the protrusion 72 by sleeving on the protruding part 721 of the protrusion 72, and a flow space 61 is formed between the hollow gasket 6 and the sealing table 7. Both ends of the spring 5 abut between the hollow gasket 6 and the bottom wall of the socket groove 42. The pre-tightening force of the spring 5 acts on the hollow gasket 6, and the sealing table 7 is pressed tightly by the hollow gasket 6. When the pressure difference between the inlet and the outlet is less than the pre-tightening force of the spring 5, the sealing table 7 fits tightly against the inner side of the valve body 8 at the inlet, forming a closed state. When the pressure difference between the inlet and the outlet is greater than the pre-tightening force of the spring 5, the sealing table 7 is pushed, and the valve port opens. Gas or liquid flows in through the inlet and out through the outlet, forming a one-way conduction. In the reverse direction, under the combined action of the spring force and the medium force, a seal is formed. Therefore, the present invention also outlines a flow space for the spring 5 to flow into the valve path two 41 by setting the hollow gasket 6 and the "convex"-shaped protrusion 72. By designing the flow space, even when the spring 5 forms a cylinder due to compression, a closed space will not be formed between the spring 5 and the sealing table 7, completely solving the problem of liquid blockage or the problem of excessive gas pressure. The sealing table 7 and the protrusion 72 can be of an integrally formed structure, and the protrusion 72 and the hollow gasket 6 can also be of an integrally formed structure.

[0043] The spring 5 initially has a certain amount of compression, and this compression force acts on the sealing platform 7. The hollow gasket 6 exerts a certain pressing force on the sealing platform 7, and this force makes the other side of the sealing platform 7 closely fit with the inlet in the inlet end valve body 8, forming a surface seal, thereby realizing that reverse gas and liquid cannot flow, and can withstand a certain amount of reverse pressure difference in the reverse direction; while in the forward direction, when the inlet pressure is greater than the outlet pressure, this force acts on the sealing platform 7. When this force is greater than the pre-tightening force of the spring 5, the spring 5 moves to the left, causing the sealing platform 7 to disengage from the valve body, that is, the inlet end valve body 8. Thus, gas or liquid flows in from the inlet, flows through the gap between the sealing platform 7 and the hollow gasket 6, and flows out from the outlet in the inlet end valve body 8, realizing the opening and closing of the valve body flow channel through the pressure difference. The ferrule nut 1, the rear ferrule 2 and the front ferrule 3 form a double-ferrule structure, which is combined on the valve body to connect the inlet 9 and the outlet 10 to the pipeline; the ferrule nut 1 is threadedly connected to the valve body.

[0044] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A one-way valve that realizes one-way conduction with corrosion resistance, comprising: An inlet-end valve body (8), the output end of which is provided with a communication groove (82) communicating with a first valve path (81) inside the inlet-end valve body (8); An outlet-end valve body (4), the input end of which is provided with a socket groove (42) communicating with a second valve path (41) inside the outlet-end valve body (4). The socket groove (42) is for the output end of the inlet-end valve body (8) to be inserted and fixed. The first valve path (81) and the second valve path (41) are communicated through the communication groove (82); A one-way control assembly, which includes a sealing platform (7) and a spring (5) assembled in the communication groove (82); the diameter of the sealing platform (7) is smaller than the diameter of the communication groove (82). Both ends of the spring (5) abut between the sealing platform (7) and the bottom wall of the socket groove (42), and drive the sealing surface (71) of the sealing platform (7) to seal the inlet of the first valve path (81) leading to the communication groove (82) due to being in a stressed state. By increasing the pressure of the first valve path (81), the spring (5) is further compressed, so that the spring (5) drives the sealing surface (71) to unseal the inlet of the first valve path (81) leading to the communication groove (82); It is characterized in that an anti-corrosion sleeve is wrapped on the outer surface of the spring (5). A "convex"-shaped protrusion (72) is provided on one side of the sealing platform (7) facing the spring (5). The one-way control assembly further includes a hollow gasket (6). The hollow gasket (6) is positioned and assembled on the protrusion (72) by sleeving on the protruding part (721) of the protrusion (72). A flow space (61) is formed between the hollow gasket (6) and the sealing platform (7); both ends of the spring (5) abut between the hollow gasket (6) and the bottom wall of the socket groove (42); a first buffer groove (73) with a diameter larger than the diameter of the inlet is provided on the sealing surface (71); a second buffer groove (85) coaxial with the first valve path (81) is provided on the bottom wall of the communication groove (82), and the diameter of the first buffer groove (73) is larger than the diameter of the second buffer groove (85).

2. The one-way valve with corrosion resistance and one-way conduction as described in claim 1, characterized in that: The anti-corrosion sleeve is made of PTFE material, and / or the hollow gasket (6) is made of PTFE material.

3. The one-way valve with corrosion resistance and one-way conduction as described in claim 1, characterized in that: All components of the one-way valve that realizes one-way conduction with corrosion resistance are made of high-purity polytetrafluoroethylene material.

4. The one-way valve with corrosion resistance and one-way conduction as claimed in claim 1, wherein: The output end of the inlet-end valve body (8) is inserted and fixed to the input end of the outlet-end valve body (4) by threaded connection.

5. The one-way valve with corrosion resistance and one-way conduction as described in claim 1, characterized in that: The sealing platform (7) and the protrusion (72) are of an integrally formed structure.

6. The one-way valve with corrosion resistance and one-way conduction as claimed in claim 5, wherein: The protrusion (72) and the hollow gasket (6) are of an integrally formed structure.

7. The one-way valve with corrosion resistance and one-way conduction as claimed in claim 1, wherein: A sealing ring (83) coaxial with the inlet-end valve body (8) is provided on the end face of the output end of the inlet-end valve body (8). When the inlet-end valve body (8) and the outlet-end valve body (4) are inserted and fixed, the sealing ring (83) is inserted into the groove wall of the socket groove (42).

8. The one-way valve with corrosion resistance and realizing one-way conduction according to claim 1, characterized in that: The output end of the inlet-end valve body (8) is inserted and fixed in the socket groove (42) by threaded connection.

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