One-way valve for low-pressure pipeline system

Abstract

The utility model discloses a one-way valve for a low-pressure pipeline system. The one-way valve aims to overcome the defect that an existing one-way valve is difficult to apply to the low-pressure pipeline system. The duckbilled valve comprises an inlet pipe, an outlet pipe and a duckbilled valve, an outlet groove is formed in the outlet pipe in the axial direction of the outlet pipe, the inlet pipe is inserted into the outlet groove and communicated with the outlet pipe, the duckbilled valve comprises a flexible duckbilled pipe, the hole area of a bottom opening of the duckbilled pipe is larger than that of a top opening of the duckbilled pipe, and the top opening of a duckbilled body is a flat opening. The outlet groove and the inlet pipe are enclosed to form a one-way chamber, the one-way chamber is communicated with the outlet pipe, the duckbilled pipe is communicated with the inlet pipe, and the duckbilled pipe is located in the one-way chamber. One-way flow is achieved through the duckbilled pipe, the hydraulic pressure difference generated when the one-way chamber and the duckbilled pipe reversely flow is used for further increasing the peak value of a flat pipe of the duckbilled pipe, and therefore one-way flow is achieved in a simple mode.

Description

Technical Field

[0001] This utility model relates to the field of low-pressure pipeline systems, and more specifically, it relates to a one-way valve for low-pressure pipeline systems. Background Technology

[0002] A check valve is a valve specifically designed to control the direction of fluid flow. When fluid passes through a check valve, it can only flow in one specific direction, from the inlet to the outlet, and cannot flow in the opposite direction. This type of valve is very common in industrial applications and is often called a check valve or non-return valve. The main function of a check valve is to ensure that fluid flows only in one direction, thus preventing any possible backflow. Specifically, in hydraulic systems, check valves effectively prevent oil from flowing backward, avoiding unexpected situations caused by pressure fluctuations or other factors. Furthermore, in pneumatic systems, check valves also play an important role, preventing compressed air from flowing backward, ensuring stable system operation and safety. To achieve this function, a check valve typically has a moving part that automatically opens and closes. When fluid flows in the correct direction, this part opens, allowing the fluid to pass smoothly; and if a tendency for reverse flow occurs, the moving part quickly closes, preventing backflow. This mechanism not only improves system reliability but also reduces potential risks and the likelihood of malfunctions.

[0003] Unlike traditional industrial check valves, fluid systems with small orifice flow rates, such as syringe pumps, vacuum systems, and other microfluidic or low-pressure piping systems, typically involve bidirectional flow. Backflow can occur when the system is stationary, affecting normal operation. To ensure unidirectional flow in certain pipelines, valves are usually added to control the flow direction. However, this method requires complex switching controls, is inconvenient to use, and the valves are expensive.

[0004] Based on this, the present application aims to provide a one-way valve for low-pressure pipeline systems. Summary of the Invention

[0005] This invention overcomes the shortcomings of existing check valves, which are difficult to apply to low-pressure pipeline systems, and provides a check valve for low-pressure pipeline systems. It has the advantages of convenient installation and low cost.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] A one-way valve for a low-pressure pipeline system includes an inlet pipe, an outlet pipe, and a duckbill valve. The outlet pipe has an outlet groove along its axial direction, and the inlet pipe is inserted into the outlet groove and communicates with the outlet pipe. The duckbill valve includes a flexible duckbill tube, the area of ​​the bottom opening of the duckbill tube is larger than the area of ​​the top opening, and the top opening of the duckbill body is a flat opening. The outlet groove and the inlet pipe enclose a one-way chamber, which is communicated with the outlet pipe and the duckbill tube is communicated with the inlet pipe. The duckbill tube is located in the one-way chamber.

[0008] The design structure of this application is relatively simple, requiring fewer components. The convenient connection between pipes allows for easy completion of the entire installation process, greatly simplifying the construction workflow. The simplified structure and reduced number of components not only lower material procurement costs but also reduce labor costs and time investment during assembly, effectively improving the overall system's stability and reliability, and further reducing subsequent maintenance and operation costs.

[0009] The unidirectional flow function achieved in this application is achieved by setting up a unidirectional chamber and a duckbill tube. The duckbill tube is wider at one end and narrower at the other, with the narrower end being a flat opening. Liquid entering from the inlet pipe enters through the bottom opening of the duckbill tube, flows out through the top opening into the unidirectional chamber, and then enters the outlet pipe. When liquid in the outlet pipe flows in the opposite direction and enters the unidirectional chamber, the smaller cross-sectional area of ​​the flat opening makes it difficult for the liquid to enter, thus partially achieving the flow-through function. Furthermore, because the duckbill tube is a flexible structure, when liquid enters the flat opening, its velocity is greater than the velocity in the unidirectional chamber. According to Bernoulli's law, the pressure at the flat opening is lower. Under hydraulic pressure, the flat opening is flattened, further reducing its cross-sectional area, thereby further restricting the reverse flow of liquid.

[0010] Preferably, the sidewall of the duckbill tube includes two opposing flat surfaces, which are inclined and the distance between them gradually decreases from the bottom to the top of the duckbill tube. Since the flat surfaces have higher flexibility than other shaped surfaces, the other surfaces of the duckbill tube will deform under pressure, thereby bringing the two flat surfaces closer together with minimal change in the shape of the opening, further reducing the cross-sectional area of ​​the opening.

[0011] Preferably, the width of the flat surface gradually decreases from top to bottom. This structure allows for greater displacement at the top of the flat surface than at the bottom, resulting in a better closure of the flat opening.

[0012] Preferably, the inlet pipe includes a butt joint section and a threaded section. The diameter of the butt joint section is the same as that of the outlet pipe. The outer wall of the threaded section is threaded, and the outer diameter of the threaded section is smaller than that of the butt joint section. The outer diameter of the outlet pipe is the same as that of the butt joint section. The outlet groove includes a threaded groove and a one-way groove. The threaded groove and the threaded section are threadedly connected, and the duckbill tube is located in the one-way groove. This structure ensures that the installed inlet and outlet pipes have the same outer diameter, resulting in better consistency and aesthetics. The threaded connection between the outlet and inlet pipes achieves a seal, which is simple and easy to assemble.

[0013] Preferably, the inlet pipe also includes a smooth shaft section located at the end of the threaded section away from the mating section. The outlet groove has a connecting groove between the threaded groove and the one-way groove, and the smooth shaft section is inserted into the connecting groove. The smooth shaft section and the connecting groove are used for mating, facilitating the threaded connection between the threaded section and the threaded groove, reducing the difficulty of assembly, and improving the convenience of assembly.

[0014] Preferably, the top of the outlet pipe is provided with a connecting joint, and the side wall of the connecting joint is provided with threads.

[0015] Preferably, the duckbill valve also includes a base, the bottom of which fits against the top surface of the inlet pipe, and the top surface of which fits against the bottom surface of the outlet groove. The base has an opening connecting the duckbill pipe and the bottom of the base. The base is used to position the duckbill pipe, thereby connecting the inlet pipe to the duckbill pipe.

[0016] As a preferred option, the base and the duckbill tube are integrated into one structure.

[0017] Preferably, the duckbill valve is made of rubber.

[0018] Compared with the prior art, the beneficial effects of this utility model are:

[0019] This application achieves unidirectional flow through a duckbill tube, and further enhances the peak flow of the duckbill tube by utilizing the hydraulic difference between the unidirectional chamber and the duckbill tube during reverse flow, thereby achieving unidirectional flow in a simple way.

[0020] The sealing method achieves a sealed connection between the inlet pipe and the outlet, which has the advantages of convenient installation and low cost. Attached Figure Description

[0021] Figure 1 This is an exploded view of this utility model;

[0022] Figure 2 This is a schematic diagram of the outlet pipe of this utility model;

[0023] Figure 3 This is a schematic diagram of the inlet pipe of this utility model;

[0024] Figure 4 This is a cross-sectional view of the assembled version of this utility model;

[0025] Figure 5 is a schematic diagram of the duckbill valve of the present utility model;

[0026] Figure 6 is a sectional view of the duckbill valve of the present utility model.

[0027] In the figure:

[0028] inlet pipe 100, butt joint section 110, optical axis section 120, threaded section 130, outlet pipe 200, outlet groove 210, threaded groove 211, connection groove 212, one-way groove 213, one-way chamber 220, connection joint 230, duckbill valve 300, base 310, duckbill pipe 320, flat surface 321, top opening 322, bottom opening 323. Specific Embodiment

[0029] The present disclosure will be further described below in conjunction with the accompanying drawings and embodiments.

[0030] It should be noted that the following detailed descriptions are all exemplary and are intended to provide further explanations for the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those of ordinary skill in the technical field to which the present application belongs.

[0031] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should also be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0032] In the present disclosure, terms such as "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "side", "bottom", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only relationship terms determined for the convenience of describing the structural relationships of various components or elements of the present disclosure and do not specifically refer to any component or element in the present disclosure. It should not be construed as a limitation to the present disclosure.

[0033] In the present disclosure, terms such as "fixed connection", "connected", "connection", etc. should be understood in a broad sense, which may mean a fixed connection, an integral connection or a detachable connection; it may be directly connected or indirectly connected through an intermediate medium. For those relevant scientific research or technical personnel in the field, the specific meanings of the above terms in the present disclosure can be determined according to specific situations and should not be construed as a limitation to the present disclosure.

[0034] Embodiment:

[0035] Refer Figure 1 As shown, a check valve for a low-pressure pipeline system includes an inlet pipe 100, an outlet pipe 200, and a duckbill valve 300. The duckbill valve 300 includes a flexible duckbill pipe 320.

[0036] Refer Figure 2 and Figure 3 As shown, the outlet pipe 200 is provided with an outlet groove 210 along its axial direction. The inlet pipe 100 is inserted into the outlet groove 210 and is connected to the outlet pipe 200. The outlet groove 210 includes a threaded groove 211 and a one-way groove 213, and the duckbill pipe 320 is located in the one-way groove 213. The inlet pipe 100 includes a butt section 110 and a threaded section 130. A relief groove is provided between the threaded section 130 and the butt section 110. The outer wall of the threaded section 130 is provided with threads, and the threaded groove 211 and the threaded section 130 are threadedly connected. The outer diameter of the threaded section 130 is smaller than that of the butt section 110. The outer diameter of the outlet pipe 200 is the same as that of the butt section 110. The outlet pipe 200 and the inlet pipe 100 are sealed by threaded connection, with a simple form and easy assembly. [[ID=**9**]] [[ID=**10**]]

[0037] [[ID=**11**]]Among them, the diameter of the butt section 110 is the same as that of the outlet pipe 200. This structure makes the installed inlet pipe 100 and outlet pipe 200 have the same outer diameter pipe bodies, with better consistency and aesthetics. [[ID=**12**]] [[ID=**13**]]

[0038] [[ID=**14**]]In some embodiments, the inlet pipe 100 further includes a smooth shaft section 120. The smooth shaft section 120 is located at the other end of the threaded section 130 away from the butt section 110. The outlet groove 210 is provided with a connection groove 212 between the threaded groove 211 and the one-way groove 213, and the smooth shaft section 120 is inserted into the connection groove 212. The smooth shaft section 120 and the connection groove 212 are used for docking, facilitating the threaded connection between the threaded section 130 and the threaded groove 211, reducing the assembly difficulty, and improving the assembly convenience. [[ID=**15**]] [[ID=**16**]]

[0039] [[ID=**17**]]Refer [[ID=**18**]] Figure 4 [[ID=**19**]]As shown, in some embodiments, the top of the outlet pipe 200 is provided with a connection joint 230, and the side wall of the connection joint 230 is provided with threads. Specifically, what is shown in [[ID=**20**]] Figure 1 [[ID=**21**]]is the internal thread type, and the outlet pipe 200 shown in [[ID=**22**]] Figure 4 [[ID=**23**]]is the external thread type. [[ID=**24**]] [[ID=**25**]]

[0040] [[ID=**26**]]Refer [[ID=**27**]] Figure 4 [[ID=**28**]]、[[ID=**29**]] Figure 5 [[ID=**30**]]and [[ID=**31**]] Figure 6As shown, the hole area of the bottom opening 323 of the duckbill pipe 320 is larger than the hole area of the top opening 322. The top opening 322 of the duckbill body is a flat opening. The outlet groove 210 and the inlet pipe 100 enclose a one-way chamber 220. The one-way chamber 220 is connected to the outlet pipe 200. The duckbill pipe 320 is connected to the inlet pipe 100. The duckbill pipe 320 is located in the one-way chamber 220. The side wall of the duckbill pipe 320 includes two relatively arranged flat surfaces 321. The two flat surfaces 321 are inclined. From the bottom to the top of the duckbill pipe 320, the distance between the two flat surfaces 321 gradually decreases. The width of the flat surface 321 gradually decreases from the top to the bottom. This structure makes the displacement at the top of the flat surface 321 larger than that at the bottom, and can better close the flat opening.

[0041] Since the flat surface 321 has higher flexibility compared to other shaped surfaces, when pressed, other surfaces of the duckbill pipe 320 will deform, so that the two flat surfaces 321 approach each other with a relatively small change in the shape of the flat opening, further reducing the cross-sectional area of the flat opening.

[0042] Refer Figure 5 and Figure 6 As shown, the duckbill valve 300 further includes a base 310. The bottom of the base 310 is in contact with the top surface of the inlet pipe 100. The top surface of the base 310 is in contact with the bottom surface of the outlet groove 210. The base 310 is provided with an opening connecting the duckbill pipe 320 and the bottom of the base 310. The base 310 is used to position the duckbill pipe 320, so that the inlet pipe 100 is connected to the duckbill pipe 320. The base 310 and the duckbill pipe 320 are of an integral structure. In some embodiments, the material of the duckbill valve 300 is rubber. The upper part of the base 310 is abutted by the bottom wall of the connecting groove 212, and the lower part is abutted by the top of the inlet pipe 100. The base 310 is deformed by about 20% under pressure, so as to complete the positioning of the duckbill valve 300.

[0043] The design structure of this application is relatively simple and the number of required components is small. Through the convenient connection method between pipes, the entire installation process can be easily completed, greatly simplifying the construction process. Due to the simplification of the structure and the reduction of components, not only the cost of material procurement is reduced, but also the labor cost and time investment required in the assembly process are reduced, and the stability and reliability of the overall system can be effectively improved, further reducing the cost of later maintenance and operation.

[0044] The unidirectional flow function is achieved by setting up a unidirectional chamber 220 and a duckbill tube 320. The duckbill tube 320 is larger at one end and smaller at the other, with the smaller end being a flat opening. Liquid entering from the inlet pipe 100 enters the bottom opening of the duckbill tube 320 and flows out from the top opening 322 into the unidirectional chamber 220, and then into the outlet pipe 200. When the liquid in the outlet pipe 200 flows in the opposite direction and enters the unidirectional chamber 220, the liquid has difficulty entering due to the smaller cross-sectional area of ​​the flat opening, thus partially achieving the flow-through function. In addition, since the duckbill tube 320 is a flexible structure, when the liquid enters the flat opening, its flow velocity is greater than that in the unidirectional chamber 220. According to Bernoulli's law, the pressure at the flat opening is lower. Under hydraulic pressure, the flat opening is flattened, further reducing its cross-sectional area, thereby further restricting the reverse flow of the liquid.

[0045] The embodiments described above are merely preferred solutions of this utility model and are not intended to limit this utility model in any way. Other variations and modifications are possible without departing from the technical solutions described in the claims.

Claims

1. A check valve for use in a low pressure piping system, characterized by, The duckbill valve comprises an inlet pipe, an outlet pipe and a duckbill valve, the outlet pipe is provided with an outlet groove in the axial direction, the inlet pipe is inserted into the outlet groove and communicates with the outlet pipe, the duckbill valve comprises a flexible duckbill pipe, the hole area of the bottom opening of the duckbill pipe is larger than the hole area of the top opening, the top opening of the duckbill body is a flat mouth, the outlet groove and the inlet pipe form a one-way chamber, the one-way chamber communicates with the outlet pipe, the duckbill pipe communicates with the inlet pipe, and the duckbill pipe is located in the one-way chamber.

2. A check valve for use in a low pressure plumbing system according to claim 1, characterised in that, The side wall of the duckbill pipe comprises two oppositely arranged flat surfaces, the two flat surfaces are inclined, and the distance between the two flat surfaces gradually decreases from the bottom to the top of the duckbill pipe.

3. A check valve for use in a low pressure plumbing system according to claim 2, characterised in that, The width of the flat surface gradually decreases from the top to the bottom.

4. A check valve for use in low pressure plumbing systems according to claim 1, wherein, The inlet pipe comprises a butt joint section and a threaded section, the diameter of the butt joint section is the same as that of the outlet pipe, the outer wall of the threaded section is provided with threads, and the outer diameter of the threaded section is smaller than that of the butt joint section; the outer diameter of the outlet pipe is the same as that of the butt joint section, the outlet groove comprises a threaded groove and a one-way groove, the threaded groove is threadedly connected with the threaded section, and the duckbill pipe is located in the one-way groove.

5. A check valve for use in a low pressure plumbing system according to claim 4, characterised in that, The inlet pipe further comprises an optical axis section, the optical axis section is located at the other end of the threaded section away from the butt joint section, the outlet groove is provided with a connecting groove between the threaded groove and the one-way groove, and the optical axis section is inserted into the connecting groove.

6. A check valve for use in low pressure plumbing systems according to claim 1, wherein, The top of the outlet pipe is provided with a connecting joint, and the side wall of the connecting joint is provided with threads.

7. A check valve for use in low pressure plumbing systems according to any one of claims 1 to 3, characterised in that, The duckbill valve further comprises a base, the bottom of the base is attached to the top surface of the inlet pipe, the top surface of the base is attached to the bottom surface of the outlet groove, and the base is provided with an opening communicating the duckbill pipe and the bottom of the base.

8. A check valve for use in a low pressure plumbing system according to claim 7, characterised in that, The base and the duckbill pipe are integrated.

9. A check valve for use in a low pressure plumbing system according to claim 8, characterised in that, The material of the duckbill valve is rubber.

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