Double ball valve with non-return function

Abstract

The utility model discloses a kind of duplex ball valves with non-return function, belong to ball valve technical field, including duplex ball valve body, one end of the duplex ball valve body is equipped with non-return pipe by bolt, the outside of the non-return pipe is provided with protection mechanism, the outside of the non-return pipe is provided with moving groove, the inside of the non-return pipe is provided with expansion tank, the inner chamber of the non-return pipe is provided with rear conical plug, the inner chamber of the moving groove is slidably connected with movable ring. In the utility model, when the inside of non-return pipe flows fluid, fluid pushes conical plug post and the inner wall of rear conical plug separate to make fluid flow, when the inside of non-return pipe does not flow fluid, the elastic force of spring is used to drive conical plug post reset, so that conical plug post is plugged to the inner chamber of non-return pipe, avoid fluid reflux, in addition, spring is supported by first fixed column and second fixed column and is packaged, spring can be replaced, and practicality is good.

Description

Technical Field

[0001] This utility model relates to the field of ball valve technology, and more specifically, to a double ball valve with a check valve function. Background Technology

[0002] The double ball valve is an industrial pipeline control device, mainly used in petroleum, chemical, gas and water treatment fields. It is used to replace the traditional complex pipeline connection form. It realizes the switching of fluid flow direction through the double L-shaped floating tee structure, reduces leakage points and simplifies the operation process.

[0003] A search revealed that utility model patent CN212718215U discloses a double ball valve with a check valve function, comprising a double ball valve body. A first valve stem is located at the top of the double ball valve body, and a first ball is located at the bottom of the first valve stem. A second valve stem is located at the top of the double ball valve body and to the left of the first valve stem, and a second ball is located at the bottom of the second valve stem. A left mounting groove is located at one end of the double ball valve body, and a left valve seat support ring is located inside the left mounting groove. A right mounting groove is located at the end of the double ball valve body away from the left mounting groove, and a right valve seat support ring is located inside the right mounting groove. A check valve disc is fixedly connected to the side wall of the right valve seat support ring by a check valve auxiliary spring. The surfaces of the check valve auxiliary spring and the check valve disc are provided with check valve bodies. This design is safe, reliable, has a long service life, and is economical. However, the above patent has the following shortcomings: the check valve auxiliary spring may lose its elasticity after long-term use, making it inconvenient to replace and affecting the subsequent check valve function. Therefore, we propose a double ball valve with a check valve function. Utility Model Content

[0004] In view of the problems existing in the prior art, the purpose of this utility model is to provide a double ball valve with a check valve function.

[0005] To solve the above problems, the present invention adopts the following technical solution:

[0006] A double ball valve with a check valve function includes a double ball valve body. A check pipe is bolted to one end of the double ball valve body. A protective mechanism is provided on the outside of the check pipe. A movable groove is provided on the outside of the check pipe. An expansion groove is provided inside the check pipe. A rear conical plug is provided in the inner cavity of the check pipe. A movable ring is slidably connected to the inner cavity of the movable groove. Multiple sliding rods are fixedly connected to the side of the movable ring. The ends of the multiple sliding rods are respectively movably sleeved into the inner cavity of the expansion groove and fixedly connected to a conical plug. The side of the end of the conical plug fits against the inner wall of the rear conical plug. Multiple first fixed posts are provided on one side of the inner cavity of the movable groove. Multiple second fixed posts are provided on the side of the movable ring. A spring is sleeved between the inner wall of the movable groove and the movable ring, and outside the first and second fixed posts.

[0007] As a preferred embodiment of this utility model, the protective mechanism includes an external threaded groove disposed on the outside of the check pipe, an internal threaded pipe being threaded onto the outside of the external threaded groove, and the internal threaded pipe being disposed on the outside of the movable groove.

[0008] As a preferred embodiment of this utility model, the inner wall of the movable groove is provided with multiple movable grooves, and the inner cavity of each of the multiple movable grooves is fixedly fitted with a sealing ring, and the slide rod is movably fitted to the inner side of the sealing ring.

[0009] As a preferred embodiment of this utility model, the check pipe is provided with a front guide port inside.

[0010] As a preferred embodiment of this utility model, both the other end of the double ball valve body and the other end of the check pipe are provided with connecting flanges.

[0011] In a preferred embodiment of this utility model, the inner surfaces of both ends of the spring are respectively attached to the outer surfaces of the first fixing post and the second fixing post.

[0012] Compared with existing technologies, the advantages of this utility model are:

[0013] (1) In this utility model, when fluid flows inside the check pipe, the fluid pushes the conical plug to separate from the inner wall of the rear conical plug, allowing the fluid to flow. When no fluid flows inside the check pipe, the spring force drives the conical plug to reset, so that the conical plug seals the inner cavity of the check pipe, preventing fluid backflow. In addition, the spring is supported by the first fixed post and the second fixed post, and the spring can be replaced, making it practical.

[0014] (2) In this utility model, by means of the threaded fit between the external threaded groove and the internal threaded tube, when it is necessary to replace the spring inside the moving groove, the internal threaded tube is rotated to move it away from the outside of the moving groove. After the spring is replaced, the internal threaded tube is rotated in the opposite direction to move it to the outside of the moving groove for protection, so as to avoid the spring and other structures from being affected by the external environment. It has good practicality. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is an exploded view of the structure of the check pipe and the internally threaded pipe of this utility model;

[0017] Figure 3 This is an exploded view of the check valve and spring of this utility model;

[0018] Figure 4 This is a cross-sectional schematic diagram of the conical plug of this utility model;

[0019] Figure 5 This is a cross-sectional schematic diagram of the check pipe of this utility model.

[0020] Explanation of the labels in the diagram:

[0021] 1. Double ball valve body; 2. Check pipe; 3. Protective mechanism; 4. Moving groove; 6. Front guide port; 7. Rear conical plug; 8. Moving ring; 9. Sliding rod; 10. Conical plug; 11. Expansion groove; 12. Spring; 13. External thread groove; 14. Internal thread pipe; 15. Connecting flange; 16. Moving groove; 17. Sealing ring; 18. First fixed post; 19. Second fixed post. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0023] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0024] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0025] Example 1:

[0026] like Figures 1 to 5 As shown, a double ball valve with a check valve function includes a double ball valve body 1, which can be a McQuay double ball valve or a Zhonglong Intelligent Control DBB double ball valve. A check pipe 2 is bolted to one end of the double ball valve body 1. A protective mechanism 3 is provided on the outside of the check pipe 2, and a moving groove 4 is provided on the outside of the check pipe 2. An expansion groove 11 is provided inside the check pipe 2, and a rear conical plug 7 is provided in the inner cavity of the check pipe 2. A movable ring 8 is slidably connected to the inner cavity of the moving groove 4. The inner surface of the movable ring 8 and the moving groove 4 are connected to the moving groove 4. The outer surface of the groove 4 is in contact with each other. Multiple sliding rods 9 are fixedly connected to the side of the movable ring 8. The ends of the multiple sliding rods 9 are respectively movably sleeved into the inner cavity of the expansion groove 11 and fixedly connected to a conical plug 10. The side of the end of the conical plug 10 is in contact with the inner wall of the rear conical plug 7. Multiple first fixed posts 18 are provided on one side of the inner cavity of the movable groove 4. Multiple second fixed posts 19 are provided on the side of the movable ring 8. A spring 12 is sleeved between the inner wall of the movable groove 4 and the movable ring 8 and outside the first fixed posts 18 and the second fixed posts 19.

[0027] Example 2:

[0028] Based on Example 1, such as Figure 1 and Figure 2 As shown, the protective mechanism 3 includes an external threaded groove 13 located on the outside of the check pipe 2. An internal threaded pipe 14 is threaded onto the outside of the external threaded groove 13. The internal threaded pipe 14 is fitted onto the outside of the movable groove 4, and the outside of the movable groove 4 is shielded and protected by the internal threaded pipe 14.

[0029] Example 3:

[0030] Based on Embodiment 1 and Embodiment 2, such as Figures 3 to 5As shown, the inner wall of the movable groove 4 is provided with multiple movable grooves 16. The inner cavity of each movable groove 16 is fixedly fitted with a sealing ring 17. The slide rod 9 is movably fitted to the inner side of the sealing ring 17. The sealing ring 17 is used to seal the slide rod 9 and the check pipe 2. The inside of the check pipe 2 is provided with a front guide port 6. The front guide port 6 is used to guide the fluid in the inner cavity of the check pipe 2 to ensure smooth fluid movement. The other end of the double ball valve body 1 and the other end of the check pipe 2 are provided with connecting flanges 15. The valve body and the pipeline are connected through the connecting flanges 15. The inner sides of both ends of the spring 12 are respectively in contact with the outer sides of the first fixed column 18 and the second fixed column 19 to ensure the stability of the spring 12 fitted on the outside of the first fixed column 18 and the second fixed column 19.

[0031] It should be noted that this utility model is a double ball valve with a check function. In use, the double ball valve is first installed on the pipeline by connecting flange 15 and bolts. When fluid flows in from one end of the check pipe 2, the fluid is guided by the front guide port 6. At the same time, the fluid pushes the conical plug 10 to move, so that the fluid moves between the conical plug 10 and the front guide port 6. In addition, when the conical plug 10 moves, it drives the slide rod 9 and the movable ring 8 to move synchronously. At the same time, the spring 12 is compressed. Then, when no more fluid enters the end of the check pipe 2, the restoring force of the spring 12 drives the movable ring 8. Reset the flow by simultaneously using the slide rod 9 and the conical plug 10, so that the end of the conical plug 10 fits against the inner wall of the front guide port 6 to seal the inner cavity of the check pipe 2 and prevent fluid backflow. Finally, rotate the internal threaded pipe 14 at regular intervals to move it outside the check pipe 2, thereby exposing the inner cavity of the moving groove 4. Then, remove the spring 12 between the movable ring 8 and the inner wall of the moving groove 4, and put the new spring 12 on the outside of the second fixed post 19 and the first fixed post 18 on the inner wall of the movable ring 8 and the moving groove 4. Then, reverse the internal threaded pipe 14 to block the outside of the moving groove 4 again.

[0032] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model based on the technical solution and its improved concept should be covered within the protection scope of the present utility model.

Claims

1. A double ball valve with check valve function, comprising a double ball valve body (1), characterized in that: One end of the double ball valve body (1) is bolted with a check pipe (2). A protective mechanism (3) is provided on the outside of the check pipe (2). A moving groove (4) is provided on the outside of the check pipe (2). An expansion groove (11) is provided inside the check pipe (2). A rear conical plug (7) is provided in the inner cavity of the check pipe (2). A movable ring (8) is slidably connected to the inner cavity of the moving groove (4). Multiple sliding rods (9) are fixedly connected to the side of the movable ring (8). The multiple sliding rods (9) The ends are respectively movably sleeved into the inner cavity of the expansion groove (11) and fixedly connected with a conical plug (10). The side of the end of the conical plug (10) is in contact with the inner wall of the rear conical plug (7). A plurality of first fixed posts (18) are provided on one side of the inner cavity of the moving groove (4). A plurality of second fixed posts (19) are provided on the side of the moving ring (8). A spring (12) is sleeved between the inner wall of the moving groove (4) and the moving ring (8) and outside the first fixed posts (18) and the second fixed posts (19).

2. A double ball valve with check valve function according to claim 1, characterized in that: The protective mechanism (3) includes an external threaded groove (13) provided on the outside of the check pipe (2), and an internal threaded pipe (14) is threaded on the outside of the external threaded groove (13), and the internal threaded pipe (14) is sleeved on the outside of the movable groove (4).

3. A double ball valve with check valve function according to claim 1, characterized in that: The inner wall of the movable groove (4) is provided with multiple movable grooves (16), and the inner cavity of each of the multiple movable grooves (16) is fixedly fitted with a sealing ring (17). The slide rod (9) is movably fitted to the inner side of the sealing ring (17).

4. A double ball valve with check valve function according to claim 1, characterized in that: The check pipe (2) has a front guide port (6) inside.

5. A double ball valve with check valve function according to claim 1, characterized in that: The other end of the double ball valve body (1) and the other end of the check pipe (2) are both provided with connecting flanges (15).

6. A double ball valve with check valve function according to claim 1, characterized in that: The inner surfaces of both ends of the spring (12) are respectively attached to the outer surfaces of the first fixing post (18) and the second fixing post (19).

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