Anti-backflow forged steel ball valve

Abstract

The utility model relates to the technical field of valves, in particular to an anti-backflow forged steel ball valve which comprises a valve body, connecting pipes are installed at the two ends of the valve body, the connecting pipe on the right side of the valve body is a water inlet pipe, and an anti-backflow assembly is arranged in the connecting pipe on the right side of the valve body. And the anti-backflow assembly is used for preventing the medium from flowing back in the pipeline of the valve. Medium backflow in a valve pipeline is avoided through the backflow prevention assembly, when the direction of water flow in the pipeline changes, reverse water pressure can push the circular truncated cone check block to move rightwards, the reverse water pressure enables the circular truncated cone check block and the edge of the sealing sleeve to be tightly attached to the inner wall of the concentric reducing ring, and therefore the pipeline is closed, and flowing of reverse water flow is avoided; when no water flow exists, the compressed reset spring drives the circular truncated cone check block to restore to the original position, and the smoothness of the pipeline is restored; and through the backflow prevention assembly, the valve has the backflow prevention capacity.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, specifically to a forged steel ball valve with anti-backflow capability. Background Technology

[0002] As a common type of valve, the ball valve's opening and closing element (ball) is driven by the valve stem and rotates around the ball valve's axis to achieve the opening and closing of the valve. Ball valves can be used not only for connecting and disconnecting fluids, but also for regulating and controlling fluids. Therefore, a forged steel ball valve with anti-backflow function is needed.

[0003] Patent document CN209084061U discloses a ball valve, but the ball valve in this patent document does not take into account the anti-backflow structure for the valve body, which may cause the medium to flow back under certain specific working conditions, affecting production safety and efficiency. Utility Model Content

[0004] One object of this application is to provide a forged steel ball valve with backflow prevention to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a forged steel ball valve with anti-backflow capability, comprising a valve body, connecting pipes installed at both ends of the valve body, the right connecting pipe of the valve body being a water inlet pipe, and an anti-backflow component being provided inside the right connecting pipe of the valve body, the anti-backflow component being used to prevent the medium from flowing back into the valve's pipe;

[0006] The anti-backflow assembly includes a fixed ring, a sleeve, a limiting groove, a limiting slide bar, a return spring, a connecting rod, a frustum stop, a sealing sleeve, and a concentric reducing ring. The inner wall of the connecting pipe is fitted with a fixed ring. Sleeves are evenly installed on one side surface of the fixed ring. Limiting grooves are symmetrically formed on the inner wall of the sleeve. A return spring is installed on one side wall of the sleeve. One end of the return spring is connected to a limiting slide bar, and both ends of the limiting slide bar are slidably connected to the limiting groove. A connecting rod is connected to one side surface of the limiting slide bar. One end of the connecting rod is connected to a frustum stop. A sealing sleeve is installed on the outer side of the frustum stop. A concentric reducing ring is installed on the inner wall of the connecting pipe, and the concentric reducing ring is located to the right of the fixed ring. The frustum stop matches the concentric reducing ring.

[0007] Preferably, a valve stem is movably mounted through the top of the valve body, and a rotating handwheel is mounted on the top of the valve stem.

[0008] Preferably, a flange is installed on the outer surface of the connecting pipe, and threaded holes are uniformly opened through one side surface of the flange.

[0009] Preferably, a receiving ring groove is formed on one side surface of the flange, and a connecting ring is installed on one side surface of the flange, with the connecting ring located on the inner arc side and the outer arc side of the receiving ring groove.

[0010] Preferably, the flange is fitted with a rubber gasket via a connecting ring.

[0011] Preferably, a compression spring is uniformly installed on one side of the inner wall of the receiving ring groove, one end of the compression spring is connected to a sliding push ring, and the outer surface of the sliding push ring slides in contact with the inner arc surface of the receiving ring groove. The side profile of the sliding push ring is T-shaped, and one side of the sliding push ring is in contact with a rubber gasket.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] This invention uses an anti-backflow component to prevent the backflow of the medium inside the valve pipeline. When the water flow direction changes in the pipeline, the reverse water pressure can push the frustum stop block to the right. The reverse water pressure makes the frustum stop block and the edge of the sealing sleeve tightly adhere to the inner wall of the concentric reducing ring, thereby sealing the pipeline and preventing the flow of reverse water. When there is no water flow, the compressed return spring drives the frustum stop block to return to its original position, restoring the unobstructed flow of the pipeline. The anti-backflow component enables the valve to have the ability to prevent backflow.

[0014] 2. This utility model uses a compression spring and a sliding push ring to ensure the sealing of the valve and other pipe diameters. If the valve is used for a long time and the flange of the other pipe becomes loose, the compression spring uses its elastic restoring force to push the sliding push ring to push the rubber gasket, so that the rubber gasket is tightly attached to the flange of the other pipe and maintains the sealing of the pipe connection. Attached Figure Description

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

[0016] Figure 2 This is a schematic diagram of the internal structure of the connecting pipe of this utility model;

[0017] Figure 3 This utility model Figure 2 Enlarged schematic diagram of the structure at point A;

[0018] Figure 4 This utility model Figure 2 Enlarged schematic diagram of the structure at point B.

[0019] In the diagram: 1. Valve body; 2. Connecting pipe; 3. Valve stem; 4. Rotating handwheel; 5. Fixed ring; 6. Sleeve; 7. Limiting groove; 8. Limiting slide bar; 9. Return spring; 10. Connecting rod; 11. Frustum stop; 12. Sealing sleeve; 13. Concentric reducing ring; 14. Flange; 15. Threaded hole; 16. Receiving ring groove; 17. Compression spring; 18. Sliding push ring; 19. Connecting ring; 20. Rubber gasket. Detailed Implementation

[0020] 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.

[0021] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used 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. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "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 according to the specific circumstances.

[0023] The following is in conjunction with the appendix Figure 1-4 The technical solution of this utility model will be further explained below:

[0024] Example 1: As Figures 1-3As shown, a forged steel ball valve with anti-backflow capability includes a valve body 1, with connecting pipes 2 installed at both ends of the valve body 1. The right-side connecting pipe 2 of the valve body 1 is a water inlet pipe. An anti-backflow assembly is installed inside the right-side connecting pipe 2 of the valve body 1 to prevent the medium from flowing back into the valve's pipe. The anti-backflow assembly includes a fixed ring 5, a sleeve 6, a limiting groove 7, a limiting slide bar 8, a return spring 9, a connecting rod 10, a frustum stop 11, a sealing sleeve 12, and a concentric reducing ring 13. The fixed ring 5 is installed on the inner wall of the connecting pipe 2, and one side surface of the fixed ring 5 is uniformly covered with... A sleeve 6 is provided, and symmetrical limit grooves 7 are formed on the inner wall of the sleeve 6. A return spring 9 is installed on one side wall of the sleeve 6. One end of the return spring 9 is connected to a limit strip 8, and both ends of the limit strip 8 are slidably connected to the limit grooves 7. A connecting rod 10 is connected to one side surface of the limit strip 8, and a frustum stop 11 is connected to one end of the connecting rod 10. A sealing sleeve 12 is installed on the outer side of the frustum stop 11. A concentric reducing ring 13 is installed on the inner wall of the connecting pipe 2, and the concentric reducing ring 13 is located to the right of the fixed ring 5. The frustum stop 11 matches the concentric reducing ring 13. Valve body 1 provides an installation position for connecting pipe 2. Connecting pipe 2 on the right is the inlet pipe, and connecting pipe 2 on the left is the outlet pipe. Connecting pipe 2 provides an installation position for the anti-backflow component. Connecting pipe 2 also provides installation positions for the fixing ring 5 and the concentric reducing ring 13. The fixing ring 5 provides an installation position for the sleeve 6. The sleeve 6 provides the opening position and installation position for the limiting groove 7 and the return spring 9, respectively. The sliding connection between the two ends of the limiting groove 7 and the limiting slide bar 8 restricts the movement distance of the limiting slide bar 8, thereby limiting the movement distance of the frustum stop 11 and preventing the frustum stop 11 from being pushed to the blocking sleeve 6 position by the water pressure in the normal flow direction. The return spring 9 can drive the frustum stop 11 back to its original position when there is no liquid in the pipe. The connecting rod 10 connects the frustum stop 11 and the limiting slide bar 8, causing the limiting slide bar 8 and the frustum stop 11 to move together. 1. Provides an installation position for the sealing sleeve 12. The sealing sleeve 12 can completely seal the edge of the frustum stop 11 and the concentric reducing ring 13 when they come into contact, preventing backflow of water. The water pressure in the normal water flow direction may push the frustum stop 11 to the left. The frustum stop 11 is limited by the limiting groove 7 and the limiting strip 8, thereby preventing the frustum stop 11 from covering the sleeve 6. When the water flow direction in the pipeline changes, the reverse water pressure can push the frustum stop 11 to the right. The return spring 9 is compressed. The reverse water pressure makes the edge of the frustum stop 11 tightly adhere to the inner wall of the concentric reducing ring 13. The presence of the sealing sleeve 12 ensures that there is no water flow between the frustum stop 11 and the concentric reducing ring 13, thereby sealing the pipeline and preventing reverse water flow. When there is no water flow, the compressed return spring 9 drives the frustum stop 11 to return to its original position, restoring the smooth flow of the pipeline.

[0025] Example 2: Figure 1As shown, a valve stem 3 is movably mounted through the top of the valve body 1, and a rotating handwheel 4 is mounted on the top of the valve stem 3. A flange 14 is mounted on the outer surface of the connecting pipe 2, and threaded holes 15 are uniformly opened through one side surface of the flange 14. The valve body 1 provides an installation position for the valve stem 3, which can drive the ball inside the valve body 1 to rotate, causing the ball to rotate around the axis of the ball valve, thereby realizing the opening and closing of the valve. The rotating handwheel 4 facilitates the rotation of the valve stem 3, reducing the force required to rotate the valve stem 3, making it easier for the operator to rotate the valve stem 3, thus facilitating the operation of the valve. The connecting pipe 2 provides an installation position for the flange 14, and the flange 14 provides a location for the threaded holes 15. The valve can be connected to other pipelines via bolts and nuts through the threaded holes 15 on the flange 14.

[0026] Example 3: Figure 1 and Figure 4 As shown, a receiving annular groove 16 is formed on one side surface of the flange 14, and a connecting ring 19 is installed on one side surface of the flange 14. The connecting ring 19 is located on the inner arc side and the outer arc side of the receiving annular groove 16. A rubber gasket 20 is installed on the flange 14 through the connecting ring 19. Compression springs 17 are evenly installed on one side inner wall of the receiving annular groove 16. One end of the compression spring 17 is connected to a sliding push ring 18, and the outer surface of the sliding push ring 18 slides in contact with the inner arc surface of the receiving annular groove 16. The side profile of the sliding push ring 18 is T-shaped, and one side of the sliding push ring 18 is in contact with the rubber gasket 20. Flange 14 provides an opening position for receiving the annular groove 16 and an installation position for the connecting ring 19. The annular groove 16 provides an installation position for the compression spring 17. The connecting ring 19 fixes the inner and outer arc edges of one side of the rubber gasket 20 to the flange 14. When the valve body 1 is connected to other pipelines, the compression spring 17 is in a compressed state. The compression spring 17 provides an installation position for the sliding push ring 18, which can push the middle ring position of the rubber gasket 20. When the valve body 1 is connected to other pipelines through flange 14, the flanges of other pipelines will squeeze the rubber gasket 20. At this time, the compression spring 17 is compressed. The compression spring 17 uses its elastic restoring force to push the sliding push ring 18 to push the rubber gasket 20, thereby making the rubber gasket 20 fit tightly against the flanges of other pipelines and maintaining the sealing of the pipeline connection.

[0027] Working principle: Before using the ball valve, check whether there are any problems that may affect its use. First, connect the ball valve to other pipelines through flange 14. When the ball valve is in use, the operator can rotate the handwheel 4 to drive the valve stem 3 to rotate, thereby controlling the ball inside the valve body 1 to rotate around the axis of the ball valve, so as to realize the opening and closing of the valve.

[0028] If the valve has been used for a long time and the flange 14 and the flanges of other pipes become loose, the compression spring 17 uses the elastic restoring force to make the sliding push ring 18 push the rubber gasket 20, so that the rubber gasket 20 is tightly pressed against the flanges of other pipes, maintaining the sealing of the pipe connection.

[0029] When the direction of water flow in the pipe changes, the reverse water pressure can push the frustum stop 11 to the right, compressing the return spring 9. The reverse water pressure makes the edge of the frustum stop 11 press tightly against the inner wall of the concentric reducing ring 13. The presence of the sealing sleeve 12 ensures that there is no water flow between the frustum stop 11 and the concentric reducing ring 13, thereby sealing the pipe and preventing the flow of reverse water. When there is no water flow, the compressed return spring 9 drives the frustum stop 11 to return to its original position, restoring the smooth flow of the pipe.

[0030] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this invention, and no reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A forged steel ball valve with anti-backflow capability, comprising a valve body (1), characterized in that: The valve body (1) is equipped with connecting pipes (2) at both ends. The connecting pipe (2) on the right side of the valve body (1) is a water inlet pipe. The connecting pipe (2) on the right side of the valve body (1) is equipped with an anti-backflow component, which is used to prevent the medium from flowing back in the valve's pipe. The anti-backflow assembly includes a fixed ring (5), a sleeve (6), a limiting groove (7), a limiting slide bar (8), a return spring (9), a connecting rod (10), a frustum stop (11), a sealing sleeve (12), and a concentric reducing ring (13). The inner wall of the connecting pipe (2) is fitted with a fixed ring (5). A sleeve (6) is evenly installed on one side surface of the fixed ring (5). The inner wall of the sleeve (6) is symmetrically provided with limiting grooves (7). A return spring (9) is installed on one side wall of the sleeve (6). One end of the spring (9) is connected to a limiting slide bar (8), and both ends of the limiting slide bar (8) are slidably connected to the limiting slide groove (7). A connecting rod (10) is connected to one side surface of the limiting slide bar (8). A frustum stop (11) is connected to one end of the connecting rod (10). A sealing sleeve (12) is installed on the outside of the frustum stop (11). A concentric variable diameter ring (13) is installed on the inner wall of the connecting pipe (2), and the concentric variable diameter ring (13) is located on the right side of the fixed ring (5). The frustum stop (11) matches the concentric variable diameter ring (13).

2. The anti-backflow forged steel ball valve according to claim 1, characterized in that: A valve stem (3) is movably mounted through the top of the valve body (1), and a rotating handwheel (4) is mounted on the top of the valve stem (3).

3. The anti-backflow forged steel ball valve according to claim 1, characterized in that: A flange (14) is installed on the outer surface of the connecting pipe (2), and threaded holes (15) are uniformly opened on one side surface of the flange (14).

4. The anti-backflow forged steel ball valve according to claim 3, characterized in that: A receiving annular groove (16) is provided on one side surface of the flange (14), and a connecting ring (19) is installed on one side surface of the flange (14), and the connecting ring (19) is located on the inner arc side and the outer arc side of the receiving annular groove (16).

5. A forged steel ball valve for preventing backflow according to claim 4, characterized in that: The flange (14) is fitted with a rubber gasket (20) via a connecting ring (19).

6. The anti-backflow forged steel ball valve according to claim 5, characterized in that: A compression spring (17) is uniformly installed on one side of the inner wall of the receiving ring groove (16). One end of the compression spring (17) is connected to a sliding push ring (18), and the outer surface of the sliding push ring (18) slides in contact with the inner arc surface of the receiving ring groove (16). The side profile of the sliding push ring (18) is T-shaped, and one side of the sliding push ring (18) is in contact with the rubber washer (20).

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