A pneumatic regulating valve anti-backflow mechanism

Abstract

This utility model relates to the field of pneumatic regulating valve technology and discloses a backflow prevention mechanism for a pneumatic regulating valve. The mechanism includes a valve, a pneumatic device fixedly connected to the top of the valve, a valve disc fixedly connected to the drive end of the pneumatic device, a sealing component at the top of the valve disc for sealing between the valve disc and the valve, an anti-backflow pipe fixedly connected to the right end of the valve, a baffle plate rotatably connected to the inner wall of the anti-backflow pipe, and a rotating component on the outer wall of the baffle plate for blocking liquid backflow. The rotating component includes fixing rings fixedly connected to both sides of the inner wall of the anti-backflow pipe. In this utility model, by setting a baffle plate at the outlet, the baffle plate automatically restores its position to block liquid backflow when backflow occurs, eliminating the need for external power, reducing pipeline pressure loss and space occupation, lowering costs, adapting to small-diameter, low-pressure scenarios, and being less prone to failure due to particle wear.

Description

Technical Field

[0001] This utility model relates to the field of pneumatic regulating valve technology, and in particular to a pneumatic regulating valve anti-backflow mechanism. Background Technology

[0002] Pneumatic control valves are the core control devices of industrial fluid systems. They receive control signals through pneumatic actuators, drive the valve core to change the valve opening, and precisely regulate parameters such as flow rate, pressure, and temperature of the medium. They can also be equipped with anti-backflow functions to ensure stable operation of the system according to process requirements and are suitable for various working conditions such as high temperature and high pressure.

[0003] The traditional method of preventing backflow by connecting a check valve in series after the regulating valve can block backflow, but it will cause pressure loss in the pipeline system. Especially in small and medium diameter low-pressure fluid systems such as domestic water supply and small air conditioning water circulation, this pressure loss will significantly affect the flow stability of the system.

[0004] In response to the technical problem of difficulty in preventing liquid backflow, this application proposes a backflow prevention mechanism for a pneumatic regulating valve. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies that make it difficult to prevent liquid backflow. This invention proposes a pneumatic regulating valve anti-backflow mechanism. By setting a baffle plate at the outlet, the baffle plate automatically restores itself to block the liquid backflow when it occurs. This eliminates the need for external power, reduces pipeline pressure loss and space occupation, lowers costs, is suitable for small and medium diameter low-pressure scenarios, and is not easily damaged by particle wear.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A pneumatic regulating valve anti-backflow mechanism includes a valve, a pneumatic device fixedly connected to the top of the valve, a valve disc fixedly connected to the drive end of the pneumatic device, a sealing component provided at the top of the valve disc for sealing between the valve disc and the valve, an anti-backflow pipe fixedly connected to the right end of the valve, a baffle plate rotatably connected to the inner wall of the anti-backflow pipe, and a rotating component provided on the outer wall of the baffle plate for blocking liquid and preventing backflow.

[0008] Furthermore, the rotating assembly includes fixed rings fixedly connected to both sides of the inner wall of the anti-backflow pipe. Each fixed ring has a groove on its inner wall, and a fixed rod is slidably connected to the inner wall of each groove. The inner end of each fixed rod is fixedly connected to the outer end of the baffle plate.

[0009] Furthermore, each of the fixed rings has a torsion spring fixedly connected to its inner wall, and the other end of each torsion spring is fixedly connected to the front and rear ends of the baffle plate.

[0010] Furthermore, sealing ring 2 is fixedly connected to both sides of the inner wall of the baffle plate, and sealing ring 3 is fixedly connected to the inner wall of the anti-backflow pipe.

[0011] Furthermore, the sealing assembly includes a connecting frame fixedly connected to the top of the valve disc, and a sealing ring is slidably connected to the inner wall of the connecting frame.

[0012] Furthermore, an air pump is fixedly connected to the inner wall of the pneumatic device, and a folded tube is fixedly connected to the air outlet of the air pump.

[0013] Furthermore, an airbag is fixedly connected to the other end of the folded tube, the top end of the airbag is fixedly connected to the inner wall of the connecting frame, and the bottom end of the airbag is located at the top of the sealing ring.

[0014] This utility model has the following beneficial effects:

[0015] 1. In this utility model, by setting a baffle plate at the water outlet, the baffle plate automatically restores itself to block the liquid and prevent backflow when the liquid flows back. No external power is required, reducing pipeline pressure loss and space occupation, lowering costs, adapting to small and medium diameter low pressure scenarios, and not easily failing due to particle wear.

[0016] 2. In this utility model, by using a downwardly pressing sealing ring to seal between the valve and the valve disc when the valve disc is closed, the tightness of the fit can be enhanced, the sealing effect can be improved, it is suitable for a variety of media, it is not easy to leak due to pressure fluctuations, the structure is simple, the maintenance cost is reduced, and the service life of the sealing components is extended. Attached Figure Description

[0017] Figure 1 This is a perspective view of a pneumatic regulating valve anti-backflow mechanism proposed in this utility model;

[0018] Figure 2 This is a cross-sectional view of the anti-backflow pipe of an anti-backflow mechanism for a pneumatic regulating valve proposed in this utility model;

[0019] Figure 3 This utility model provides a structural diagram of the fixed ring of a pneumatic regulating valve anti-backflow mechanism.

[0020] Figure 4 This is a cross-sectional view of a pneumatic regulating valve anti-backflow mechanism proposed in this utility model;

[0021] Figure 5 This is a cross-sectional view of the connecting frame of a pneumatic regulating valve anti-backflow mechanism proposed in this utility model.

[0022] Legend:

[0023] 1. Valve; 2. Pneumatic equipment; 3. Valve disc; 4. Air pump; 5. Folded pipe; 6. Connecting frame; 7. Airbag; 8. Sealing ring one; 9. Anti-backflow pipe; 10. Water baffle; 11. Sealing ring two; 12. Fixing rod; 13. Fixing ring; 14. Slide groove; 15. Torsion spring; 16. Sealing ring three. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Reference Figures 1-3 As shown, one embodiment of this utility model provides a pneumatic regulating valve anti-backflow mechanism, including a valve 1, a pneumatic device 2 fixedly connected to the top of the valve 1, a valve disc 3 fixedly connected to the driving end of the pneumatic device 2, a connecting frame 6 fixedly connected to the top of the valve disc 3, a sealing ring 8 slidably connected to the inner wall of the connecting frame 6, an air pump 4 fixedly connected to the inner wall of the pneumatic device 2, a folded tube 5 fixedly connected to the air outlet of the air pump 4, an air bag 7 fixedly connected to the other end of the folded tube 5, the top of the air bag 7 fixedly connected to the inner wall of the connecting frame 6, and the bottom of the air bag 7 set at the top of the sealing ring 8 for sealing between the valve disc 3 and the valve 1.

[0026] Specifically, when the baffle plate 10 rotates counterclockwise, the fixing rod 12 slides on the inner wall of the slide groove 14. When the baffle plate 10 rotates to the vertical position, the fixing rod 12 will not continue to rotate counterclockwise due to the shape of the slide groove 14, thus fixing the baffle plate 10 in the vertical position. The torsion spring 15 is in the normal state. By setting the baffle plate 10 at the outlet, when the liquid flows back, the baffle plate 10 automatically returns to block the liquid and prevent backflow. No external power is required, reducing pipeline pressure loss and space occupation, reducing costs, adapting to small and medium diameter low-pressure scenarios, and not easily failing due to particle wear.

[0027] Reference Figure 4 and Figure 5As shown, a backflow prevention pipe 9 is fixedly connected to the right end of valve 1. A baffle plate 10 is rotatably connected to the inner wall of the backflow prevention pipe 9. Fixing rings 13 are fixedly connected to both sides of the inner wall of the backflow prevention pipe 9. A sliding groove 14 is opened on the inner wall of each fixing ring 13. A fixing rod 12 is slidably connected to the inner wall of each sliding groove 14. The inner end of the fixing rod 12 is fixedly connected to the outer end of the baffle plate 10. A torsion spring 15 is fixedly connected to the inner wall of each fixing ring 13. The other end of the torsion spring 15 is fixedly connected to the front and rear ends of the baffle plate 10. A sealing ring 2 11 is fixedly connected to both sides of the inner wall of the baffle plate 10. A sealing ring 3 16 is fixedly connected to the inner wall of the backflow prevention pipe 9 to block the liquid and prevent backflow.

[0028] Specifically, a controller is installed at the front end of the pneumatic device 2. The controller is electrically connected to the pneumatic device 2 and the air pump 4. The working principle of the pneumatic device 2 is to use compressed air as a power source and convert air pressure energy into mechanical energy through components such as diaphragms or pistons. This drives the valve stem to move the valve disc 3, thereby realizing the opening, closing, or opening degree adjustment of the valve 1. The operation process is stable and controllable. When the valve disc 3 is closed, a downwardly pressing sealing ring 8 is used to seal between the valve 1 and the valve disc 3, which can enhance the tightness of the fit, improve the sealing effect, adapt to various media, and is not prone to leakage due to pressure fluctuations. The structure is simple, the maintenance cost is reduced, and the service life of the sealing components is extended.

[0029] Working principle: First, when conveying liquid, the pneumatic device 2 moves the valve disc 3 at the drive end upward, conveying the liquid to the right and into the anti-backflow pipe 9. When the liquid comes into contact with the baffle plate 10, it will drive the baffle plate 10 to rotate clockwise, causing the fixing rod 12 to slide on the inner wall of the slide groove 14, thus conveying the liquid to the right. After the conveying is completed, the pneumatic device 2 again brings the valve disc 3 into contact with the valve 1. The baffle plate 10 rotates counterclockwise through the torsion spring 15, causing the sealing rings 11 and 16 on the inner wall of the baffle plate 10 to come into contact, making the baffle plate 10 contact the anti-backflow pipe 9 to seal and prevent liquid backflow. At the same time, the air pump 4 is started, and the air pump 4 delivers gas through the folded pipe 5 to the air bag 7 and inflates it, squeezing the lower sealing ring 8 downward and making it contact the gap between the valve disc 3 and the valve 1 to seal.

[0030] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A backflow prevention mechanism for a pneumatic control valve, characterized by, The device includes a valve (1), a pneumatic device (2) is fixedly connected to the top of the valve (1), a valve disc (3) is fixedly connected to the drive end of the pneumatic device (2), a sealing component is provided at the top of the valve disc (3) for sealing between the valve disc (3) and the valve (1), an anti-backflow pipe (9) is fixedly connected to the right end of the valve (1), a baffle plate (10) is rotatably connected to the inner wall of the anti-backflow pipe (9), and a rotating component is provided on the outer wall of the baffle plate (10) for blocking the liquid and preventing backflow.

2. A backflow prevention mechanism for a pneumatic control valve according to claim 1, characterized in that: The rotating assembly includes fixed rings (13) fixedly connected to both sides of the inner wall of the anti-backflow pipe (9). The inner wall of each fixed ring (13) is provided with a sliding groove (14). The inner wall of each sliding groove (14) is slidably connected with a fixed rod (12). The inner end of each fixed rod (12) is fixedly connected to the outer end of the baffle plate (10).

3. A backflow prevention mechanism for a pneumatic control valve according to claim 2, wherein: Each of the fixed rings (13) has a torsion spring (15) fixedly connected to its inner wall, and the other end of each torsion spring (15) is fixedly connected to the front and rear ends of the baffle plate (10).

4. The anti-surge mechanism for a pneumatic control valve according to claim 2, wherein: Both sides of the inner wall of the baffle plate (10) are fixedly connected with sealing ring two (11), and the inner wall of the anti-backflow pipe (9) is fixedly connected with sealing ring three (16).

5. The anti-suckback mechanism for a pneumatic control valve according to claim 1, wherein: The sealing assembly includes a connecting frame (6) fixedly connected to the top of the valve disc (3), and a sealing ring (8) is slidably connected to the inner wall of the connecting frame (6).

6. A backflow prevention mechanism for a pneumatic control valve according to claim 5, wherein: The pneumatic device (2) has an air pump (4) fixedly connected to its inner wall, and the air outlet of the air pump (4) is fixedly connected to a folded pipe (5).

7. A backflow prevention mechanism for a pneumatic control valve according to claim 6, wherein: The other end of the folded tube (5) is fixedly connected to an airbag (7), the top end of the airbag (7) is fixedly connected to the inner wall of the connecting frame (6), and the bottom end of the airbag (7) is set at the top of the sealing ring (8).

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