Backflow prevention check valve

Abstract

The utility model discloses an anti-backflow check valve, and relates to the field of check valves. The anti-backflow check valve comprises a valve body unit and a swing type valve clack unit arranged in the valve body unit, a sealing unit is arranged between the valve body unit and the swing type valve clack unit, the swing type valve clack unit comprises a valve clack and a sealing gasket, the sealing gasket is fixedly installed on the side face of the valve clack, and the valve clack is arranged on the valve body unit. The sealing gasket is arranged in the valve body unit and tightly attached to the inner wall of the valve body unit, the sealing unit comprises a sealing ring and an elastic piece, the sealing ring is arranged in the valve body unit and tightly abuts against the sealing gasket, and the elastic piece is arranged between the sealing ring and the interior of the valve body unit. According to the anti-backflow check valve, the sealing unit is arranged, and the sealing ring tightly abuts against the sealing gasket, so that leakage of fluid is effectively prevented. Meanwhile, due to the arrangement of the elastic piece, the sealing ring can be always in close contact with the sealing gasket, the sealing effect is further enhanced, and it is ensured that fluid backflow can be effectively prevented under various working conditions.

Description

Technical Field

[0001] This utility model relates to the field of check valve technology, specifically to an anti-backflow check valve. Background Technology

[0002] Preventing backflow is a critical requirement in various fluid transport pipeline systems. When fluid in a pipeline system flows in the opposite direction due to pressure changes or other factors, it may damage equipment within the system, affect the normal operation of the system, or even cause safety accidents.

[0003] Currently, although various types of check valves exist on the market to prevent fluid backflow, these check valves often have some shortcomings. For example, swing check valves have a rotating valve disc inside, with a torsion spring between the valve disc and the valve body. This allows the valve disc to fit tightly against the inner wall of the valve body when there is no feed medium, thus achieving an effective sealing and backflow prevention effect. However, after long-term use, the spring may become fatigued or affected by excessive impurities, causing the valve disc to fail to fit tightly against the inner wall of the valve body, which may lead to backflow. Therefore, this application proposes an anti-backflow check valve. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides an anti-backflow check valve, which solves the problem that after long-term use, the spring of a swing check valve may become fatigued or have too many impurities, causing the valve disc to fail to fit tightly against the inner wall of the valve body, thus potentially leading to backflow.

[0005] To achieve the above objectives, this utility model is implemented through the following technical solution: a backflow prevention check valve, comprising a valve body unit and a swing valve disc unit disposed inside the valve body unit, wherein a sealing unit is provided between the valve body unit and the swing valve disc unit;

[0006] The swing valve disc unit includes:

[0007] The valve disc rotates within the valve body unit.

[0008] A rotating shaft is mounted on top of the valve disc, and a torsion spring is provided between the rotating shaft and the interior of the valve body unit;

[0009] The sealing gasket is fixedly installed on the side of the valve disc and is tightly fitted to the inner wall of the valve body unit.

[0010] The sealing unit includes:

[0011] A sealing ring is located inside the valve body unit, and the sealing ring and the sealing gasket are tightly pressed together.

[0012] The elastic element is located between the sealing ring and the interior of the valve body unit.

[0013] Preferably, the valve body unit includes:

[0014] Valve body body;

[0015] The feed inlet is installed at one end of the valve body and is connected to the interior of the valve body.

[0016] The discharge port is installed at the other end of the valve body and is connected to the interior of the valve body.

[0017] Preferably, a mounting plate is fixedly connected to the top of the valve body, and a sealing cap is fixedly connected to the top of the mounting plate by threads.

[0018] Preferably, a flange is fixedly connected to the end of both the inlet and outlet that is away from the valve body.

[0019] Preferably, a limit ring is installed inside the valve body unit, the end of the rotating shaft is rotatably connected to the limit ring, and the torsion spring is disposed between the end of the rotating shaft and the limit ring.

[0020] Preferably, a reinforcing rib is installed on the outer side of the valve disc.

[0021] Preferably, an annular groove is provided at the connection between the valve body and the feed inlet, a movable ring is slidably disposed on the inner wall of the annular groove, one side of the sealing ring extends toward the interior of the annular groove and is fixedly connected to the movable ring, and the elastic element is disposed between the other side of the movable ring and the inner wall of the annular groove.

[0022] Preferably, a sealing groove is provided on the outer side of the sealing gasket, and the sealing ring abuts against the inner wall of the sealing groove.

[0023] This utility model discloses an anti-backflow check valve, which has the following beneficial effects: The anti-backflow check valve, through its swing-type valve disc unit, uses a rotating shaft and a torsion spring to ensure the sealing gasket is tightly fitted against the inner wall of the valve body unit, thus achieving a sealing effect. Simultaneously, the sealing unit, in which the sealing ring and sealing gasket are tightly abutted against each other, and the sealing gasket is tightly fitted against the inner wall of the valve body unit, effectively prevents fluid leakage. Furthermore, the elastic element ensures that the sealing ring maintains constant tight contact with the sealing gasket, further enhancing the sealing effect and ensuring effective prevention of fluid backflow under various operating conditions. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0026] Figure 2 This is a cross-sectional view of the structure of this utility model;

[0027] Figure 3 This utility model Figure 2 Partial structural diagram;

[0028] Figure 4 This utility model Figure 3 Enlarged diagram of part A in the image.

[0029] In the diagram: 1. Valve body unit; 11. Valve body body; 12. Inlet; 13. Outlet; 14. Mounting plate; 15. Sealing cover; 16. Flange; 2. Swing valve disc unit; 21. Valve disc; 22. Rotating shaft; 23. Sealing gasket; 231. Sealing groove; 24. Limiting ring; 25. Reinforcing rib; 3. Sealing unit; 31. Annular groove; 32. Moving ring; 33. Sealing ring; 34. Elastic element. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are described clearly and completely. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] This application provides an anti-backflow check valve, which solves the problem that after long-term use, the spring of a swing check valve may become fatigued or have too many impurities, causing the valve disc to not fit tightly against the inner wall of the valve body, thus potentially leading to backflow.

[0032] By setting a sealing unit 3, in which the sealing ring 33 abuts tightly against the sealing gasket 23, and the sealing gasket 23 fits tightly against the inner wall of the valve body unit 1, fluid leakage is effectively prevented. At the same time, the setting of the elastic element 34 ensures that the sealing ring 33 can always maintain tight contact with the sealing gasket 23, further enhancing the sealing effect and ensuring that fluid backflow can be effectively prevented under various operating conditions.

[0033] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0034] This utility model discloses an anti-backflow check valve.

[0035] According to the appendix Figure 1-4 As shown, it includes a valve body unit 1 and a swing valve disc unit 2 disposed inside the valve body unit 1, and a sealing unit 3 is provided between the valve body unit 1 and the swing valve disc unit 2.

[0036] The swing valve disc unit 2 includes:

[0037] Valve disc 21, which is rotatably disposed inside valve body unit 1;

[0038] A rotating shaft 22 is mounted on the top of the valve disc 21, and a torsion spring is provided between the rotating shaft 22 and the interior of the valve body unit 1.

[0039] The sealing gasket 23 is fixedly installed on the side of the valve disc 21, and the sealing gasket 23 is tightly fitted to the inner wall of the valve body unit 1.

[0040] Sealing unit 3 includes:

[0041] A sealing ring 33 is disposed inside the valve body unit 1, and the sealing ring 33 is tightly abutted against the sealing gasket 23;

[0042] The elastic element 34 is disposed between the sealing ring 33 and the interior of the valve body unit 1.

[0043] Through the swing valve disc unit 2, the valve disc 21, under the action of the rotating shaft 22 and the torsion spring, makes the sealing gasket 23 tightly fit against the inner wall of the valve body unit 1, thereby achieving a sealing effect. Simultaneously, the sealing unit 3, in which the sealing ring 33 tightly abuts against the sealing gasket 23 and the sealing gasket 23 tightly fits against the inner wall of the valve body unit 1, effectively prevents fluid leakage. Furthermore, the elastic element 34 ensures that the sealing ring 33 maintains close contact with the sealing gasket 23 at all times, further enhancing the sealing effect and ensuring effective prevention of fluid backflow under various operating conditions.

[0044] Furthermore, valve body unit 1 includes:

[0045] Valve body 11;

[0046] The feed inlet 12 is installed at one end of the valve body 11 and is connected to the interior of the valve body 11.

[0047] The discharge port 13 is installed at the other end of the valve body 11 and is connected to the interior of the valve body 11.

[0048] Furthermore, a mounting plate 14 is fixedly connected to the top of the valve body 11, and a sealing cap 15 is fixedly connected to the top of the mounting plate 14 by threads.

[0049] Furthermore, flanges 16 are fixedly connected to the ends of the inlet 12 and outlet 13 that are away from the valve body 11.

[0050] The inlet 12 and outlet 13 of valve body unit 1 are both fixedly connected to flanges 16 at the ends away from the valve body body 11, facilitating connection and installation with other pipelines. A mounting plate 14 is fixedly connected to the top of the valve body body 11, and a sealing cover 15 is fixedly connected to the top of the mounting plate 14 by threads, facilitating maintenance and repair of the valve body interior and reducing operating costs and difficulty.

[0051] Furthermore, a limit ring 24 is installed inside the valve body unit 1, the end of the rotating shaft 22 is rotatably connected to the limit ring 24, and a torsion spring is disposed between the end of the rotating shaft 22 and the limit ring 24.

[0052] Furthermore, a reinforcing rib 25 is installed on the outer side of the valve disc 21.

[0053] A torsion spring is installed between the rotating shaft 22 of the swing valve disc unit 2 and the interior of the valve body unit 1, enabling the valve disc 21 to respond quickly to changes in fluid pressure and open or close promptly. A limiting ring 24 limits the rotation of the rotating shaft 22, ensuring the stability and accuracy of the valve disc 21's rotation. Reinforcing ribs 25 installed on the outside of the valve disc 21 enhance its strength, improving the reliability and service life of the entire check valve.

[0054] Furthermore, an annular groove 31 is provided at the connection between the valve body 11 and the feed port 12. A movable ring 32 is slidably disposed on the inner wall of the annular groove 31. One side of the sealing ring 33 extends toward the interior of the annular groove 31 and is fixedly connected to the movable ring 32. An elastic element 34 is disposed between the other side of the movable ring 32 and the inner wall of the annular groove 31.

[0055] Furthermore, a sealing groove 231 is provided on the outer side of the sealing gasket 23, and the sealing ring 33 abuts against the inner wall of the sealing groove 231.

[0056] When fluid enters the valve body 11 through the inlet 12, the fluid pressure acts on the valve disc 21, overcoming the resistance of the torsion spring and causing the valve disc 21 to rotate around the rotating shaft 22 and open. At this time, the fluid smoothly passes through the channel between the valve disc 21 and the valve body 11 and flows out from the outlet 13. During the fluid flow, the sealing gasket 23 is tightly fitted to the inner wall of the valve body unit 1, and the sealing ring 33 is tightly pressed against the sealing gasket 23 under the action of the elastic element 34, ensuring the valve's sealing performance.

[0057] When the fluid shows a tendency to flow backward, the pressure direction of the fluid changes, and the pressure acting on valve disc 21 is opposite to that during normal flow. Under the restoring force of the torsion spring, valve disc 21 quickly rotates around the rotating shaft 22 to close, preventing the fluid from flowing backward. At the same time, the sealing gasket 23 fits tightly against the inner wall of the valve body unit 1, and the sealing ring 33 further enhances the sealing effect on the sealing gasket 23, ensuring that the fluid cannot flow backward through the valve.

[0058] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A backflow prevention check valve, comprising a valve body unit (1) and a swing valve disc unit (2) disposed inside the valve body unit (1), characterized in that, A sealing unit (3) is provided between the valve body unit (1) and the swing valve disc unit (2); The swing valve disc unit (2) includes: The valve disc (21) is rotatably disposed inside the valve body unit (1); A rotating shaft (22) is mounted on the top of the valve disc (21), and a torsion spring is provided between the rotating shaft (22) and the interior of the valve body unit (1); A sealing gasket (23) is fixedly installed on the side of the valve disc (21), and the sealing gasket (23) is tightly fitted to the inner wall of the valve body unit (1); The sealing unit (3) includes: A sealing ring (33) is disposed inside the valve body unit (1), and the sealing ring (33) is in close contact with the sealing gasket (23); An elastic element (34) is disposed between the sealing ring (33) and the interior of the valve body unit (1).

2. The anti-backflow check valve according to claim 1, characterized in that, The valve body unit (1) includes: Valve body (11); The feed inlet (12) is installed at one end of the valve body (11) and is connected to the interior of the valve body (11); The discharge port (13) is installed at the other end of the valve body (11) and is connected to the interior of the valve body (11).

3. The anti-backflow check valve according to claim 2, characterized in that, A mounting plate (14) is fixedly connected to the top of the valve body (11), and a sealing cap (15) is fixedly connected to the top of the mounting plate (14) by threads.

4. The anti-backflow check valve according to claim 2, characterized in that, The inlet (12) and outlet (13) are both fixedly connected to flanges (16) at the ends away from the valve body (11).

5. The anti-backflow check valve according to claim 1, characterized in that, A limiting ring (24) is installed inside the valve body unit (1). The end of the rotating shaft (22) is rotatably connected to the limiting ring (24), and the torsion spring is disposed between the end of the rotating shaft (22) and the limiting ring (24).

6. The anti-backflow check valve according to claim 1, characterized in that, The valve disc (21) is fitted with a reinforcing rib (25) on its outer side.

7. The anti-backflow check valve according to claim 2, characterized in that, An annular groove (31) is provided at the connection between the valve body (11) and the feed port (12). A movable ring (32) is slidably arranged on the inner wall of the annular groove (31). One side of the sealing ring (33) extends toward the interior of the annular groove (31) and is fixedly connected to the movable ring (32). The elastic element (34) is arranged between the other side of the movable ring (32) and the inner wall of the annular groove (31).

8. The anti-backflow check valve according to claim 1, characterized in that, The sealing gasket (23) has a sealing groove (231) on its outer side, and the sealing ring (33) abuts against the inner wall of the sealing groove (231).

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