Large-diameter labor-saving adjusting stop valve

Abstract

The utility model discloses a large -calibre labor -saving adjustment's stop valve relates to the field of stop valve, and its technical scheme main points are: including stop valve body, the transmission end on the valve stem of stop valve body is installed with labor -saving transmission subassembly, the labor -saving transmission subassembly includes the worm wheel and worm that mutually meshed connection, the worm wheel is linked with the valve stem, the end of worm is installed with hand wheel, and the rotation of worm wheel is driven through the rotation of worm, finally drives the rotation of valve stem, increases the transmission ratio, makes the adjustment torque of stop valve reduce, effect is in the great reduction staff operating torque's time, and the opening and closing or flow regulation of stop valve are steadily completed, solve the problem of hard operation in traditional direct transmission structure, and because the stability of worm wheel worm drive reduces the valve stem jam and sealing surface eccentric wear risk.

Description

Technical Field

[0001] This utility model relates to the field of gate valves, and more specifically, it relates to a large-diameter, labor-saving gate valve. Background Technology

[0002] Large-diameter gate valves are key control devices in industrial pipelines, municipal water supply, and water conservancy projects. They are commonly used in pipeline systems with a diameter of ≥DN200. They achieve fluid on / off or flow regulation by raising and lowering the valve disc. Their working environment is often accompanied by high-pressure (above 1.6MPa) and high-velocity fluids, which places extremely high demands on the valve's regulation stability and operational reliability.

[0003] However, the valve stems on existing large-diameter gate valves are mostly rigidly connected directly to the handwheel. When adjusting, it is necessary to overcome the huge thrust of the fluid in the pipeline on the valve disc (which increases geometrically with the increase of diameter), resulting in a very large operating torque and increasing the difficulty of operation. At the same time, since the required operating torque is far beyond the range that can be easily controlled by manpower, during operation, muscle fatigue and changes in the angle of force application can easily cause sudden changes in the instantaneous force. When the force is uneven, it is easy to cause valve stem jamming and uneven wear of the sealing surface, shortening the service life of the equipment.

[0004] Therefore, in order to solve the above-mentioned technical problems, this application proposes a large-diameter, labor-saving regulating shut-off valve. Utility Model Content

[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a large-diameter, labor-saving adjustable shut-off valve.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a large-diameter, labor-saving regulating stop valve, comprising a stop valve body, wherein a labor-saving transmission component is installed on the transmission end of the valve stem of the stop valve body; The force-saving transmission assembly includes a worm gear and a worm connected to each other. The worm gear is connected to the valve stem, and a handwheel is installed at the end of the worm. By rotating the worm, the worm gear is driven to rotate, which in turn drives the valve stem to rotate, increasing the transmission ratio and reducing the regulating torque of the shut-off valve.

[0007] Preferably, the force-saving transmission assembly further includes an L-shaped connecting plate having a horizontal part and a vertical part that are perpendicular to each other. A bearing A is fixedly connected to the bottom surface of the horizontal part, and a rotating rod A is fixedly connected to the inner ring of the bearing A. The bottom end of the rotating rod A is connected to the center of the top end of the worm gear. A bearing B is fixedly connected to the surface of the vertical part, and a rotating rod B is fixedly connected to the inner ring of the bearing B. The rotating rod B is connected to the other end of the worm gear relative to the handwheel.

[0008] Preferably, the force-saving transmission component is detachably connected to the valve body of the shut-off valve.

[0009] Preferably, the bottom end of the worm gear is connected to the connecting block via a connecting rod, and the top end of the valve stem is fixedly connected to a connecting groove seat into which the connecting block is inserted.

[0010] Preferably, the top two sides of the valve body of the shut-off valve are connected to the square slot seat by support rods. The top of the transverse part is fixedly connected to an N-shaped plate, and square blocks are welded to both ends of the N-shaped plate. Screws A are fixedly connected to both sides of the inner bottom wall of the square slot seat. Through holes for screws A to pass through are opened on both sides of the square blocks. Nuts are threaded onto the outer side wall of the screws A.

[0011] Preferably, the outer side wall of the support rod is connected to the vertical plate via a horizontal plate, the vertical plate is internally threaded with a screw B, and the head of the screw B is rotatably connected to the arc plate via a bearing C. Friction patterns are formed on the contact surface between the arc plate and the connecting groove seat.

[0012] Preferably, a telescopic rod is installed between the arc-shaped plate and the vertical plate to maintain the linear movement of the arc-shaped plate relative to the vertical plate.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. This utility model rotates the worm by turning the handwheel at the end of the worm. Utilizing the meshing transmission relationship between the worm and the worm wheel, the rotational motion of the worm is transmitted to the worm wheel. Since the worm wheel and worm drive have a large transmission ratio, according to the inverse relationship between torque and speed, the small operating torque input to the worm is amplified by the transmission and converted into a large output torque sufficient to drive the valve stem through the worm wheel connected to the valve stem. This drives the valve stem to rotate, thereby realizing the raising and lowering of the valve disc. Thus, while significantly reducing the operating torque required by the operator, the opening and closing of the shut-off valve or flow regulation is smoothly completed. This not only solves the problem of laborious operation in the traditional direct drive structure, but also reduces the risk of valve stem jamming and uneven wear of the sealing surface due to the smoothness of the worm wheel and worm drive. 2. In this utility model, the force-saving transmission component and the valve body of the shut-off valve are detachably connected. When the transmission component has faults such as worm gear wear or bearing failure, the entire component can be directly removed for repair or replacement without disassembling the entire shut-off valve body, which greatly shortens the maintenance cycle. At the same time, this design allows for the replacement of transmission components with different transmission ratios according to actual working conditions, improving the adaptability of the shut-off valve to diverse working environments. Attached Figure Description

[0014] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This utility model Figure 1 Enlarged view of the local structure of A; Figure 3 This is a schematic diagram of the specific structure of the side of this utility model; Figure 4 This is a schematic diagram of the specific structure of this utility model after the handwheel is removed; Figure 5 This is a schematic diagram of the specific structure of the force-saving transmission component in this utility model; Figure 6 This is a schematic diagram of the valve body connection structure of the shut-off valve in this utility model.

[0015] In the diagram: 1. Gate valve body; 2. Valve stem; 3. Force-saving transmission assembly; 301. Worm gear; 302. Worm; 303. Handwheel; 304. L-shaped connecting plate; 3041. Horizontal part; 3042. Vertical part; 305. Bearing A; 306. Rotating rod A; 307. Bearing B; 308. Rotating rod B; 4. Connecting rod; 5. Connecting block; 6. Connecting slot seat; 7. Square slot seat; 8. N-shaped plate; 9. Square block; 901. Through hole; 10. Screw A; 11. Horizontal plate; 12. Vertical plate; 13. Screw B; 14. Bearing C; 15. Arc plate; 16. Telescopic rod; 17. Support rod. Detailed Implementation

[0016] like Figure 1-6 As shown, this utility model provides a large-diameter, labor-saving regulating stop valve, including a stop valve body 1, and a labor-saving transmission component 3 installed on the transmission end of the valve stem 2 of the stop valve body 1. The force-saving transmission assembly 3 includes a worm gear 301 and a worm 302 that are meshed together. The worm gear 301 is connected to the valve stem 2. A handwheel 303 is installed at the end of the worm 302. By rotating the worm 302, the worm gear 301 is driven to rotate, which in turn drives the valve stem 2 to rotate, increasing the transmission ratio and reducing the regulating torque of the shut-off valve.

[0017] When the shut-off valve needs to be adjusted, the operator rotates the handwheel 303 at the end of the worm 302 to rotate the worm 302. Utilizing the meshing transmission relationship between the worm 302 and the worm wheel 301, the rotational motion of the worm 302 is transmitted to the worm wheel 301. Because the transmission between the worm wheel 301 and the worm 302 has a large transmission ratio (the speed of the worm 302 is much higher than that of the worm wheel 301), according to the inverse relationship between torque and speed, the small operating torque input to the worm 302 is amplified and converted into a larger output torque sufficient to drive the valve stem 2 through the worm wheel 301 connected to the valve stem 2. This drives the valve stem 2 to rotate, thus raising and lowering the valve disc. This significantly reduces the operator's operating torque while smoothly completing the opening and closing of the shut-off valve or flow regulation (due to the reduced effort, it facilitates smooth operation). This solves the problem of laborious operation in traditional direct drive structures and reduces the risk of valve stem jamming and uneven wear on the sealing surface due to the smoothness of the worm wheel 301 and worm 302 transmission.

[0018] The following is the specific structure of the force-saving transmission component 3: The force-saving transmission component 3 also includes an L-shaped connecting plate 304, which has a horizontal part 3041 and a vertical part 3042 that are perpendicular to each other. A bearing A305 is fixedly connected to the bottom surface of the horizontal part 3041, and a rotating rod A306 is fixedly connected to the inner ring of the bearing A305. The bottom end of the rotating rod A306 is connected to the center of the top of the worm gear 301. A bearing B307 is fixedly connected to the surface of the vertical part 3042, and a rotating rod B308 is fixedly connected to the inner ring of the bearing B307. The rotating rod B308 is connected to the other end of the worm gear 302 relative to the handwheel 303.

[0019] The L-shaped connecting plate 304 provides stable support for the transmission assembly through the vertical structure of the horizontal part 3041 and the vertical part 3042. The bearing A305 on the bottom surface of the horizontal part 3041 fixes the rotating rod A306. When the worm gear 301 rotates, it drives the rotating rod A306 to rotate. The rotating rod A306 drives the inner ring of the bearing A305 to rotate, and the inner ring of the bearing A305 rotates along with its outer ring, thus providing rotational support for the worm gear 301 and ensuring that the worm gear 301 rotates coaxially with the valve stem 2 (reducing radial offset). The bearing B307 on the surface of the vertical part 3042 fixes the rotating rod B308. When the worm gear 302 rotates, it drives the rotating rod B308 to rotate. Rod B308 drives the inner ring of bearing B307 to rotate, and the inner ring rotates along with its outer ring, thereby providing rotational support for worm 302 and ensuring that worm 302 and worm wheel 301 always maintain precise meshing (meshing clearance is stable at 0.1-0.2mm). During operation, the operator turns handwheel 303 to drive worm 302 to rotate. The helical teeth of worm 302 push the teeth of worm wheel 301, ultimately driving valve stem 2 to rotate. By utilizing the large transmission ratio (e.g., 1:20) of worm wheel 301 and worm 302, the small torque input by handwheel 303 is amplified into a large torque to drive valve stem 2, realizing labor-saving and smooth adjustment of large-diameter gate valve and ensuring that valve stem 2 is subjected to uniform force.

[0020] The power-saving transmission component 3 is detachably connected to the valve body 1 of the shut-off valve. When the transmission component experiences faults such as wear of the worm gear 301 and worm 302, or bearing failure, the entire component can be removed for repair or replacement without disassembling the entire valve body 1, significantly shortening the maintenance cycle. Furthermore, this design allows for the replacement of transmission components with different transmission ratios according to actual operating conditions (such as fluid pressure and operating frequency), improving the shut-off valve's adaptability to diverse working environments. The specific detachable structure is as follows: the bottom end of the worm gear 301 is connected via... The connecting rod 4 is connected to the connecting block 5. The top of the valve stem 2 is fixedly connected to the connecting slot seat 6 for the connecting block 5 to be inserted. The top of the valve body 1 is connected to the square slot seat 7 on both sides through the support rod 17. The top of the transverse part 3042 is fixedly connected to the N-shaped plate 8, and square blocks 9 are welded to both ends of the N-shaped plate 8. The inner bottom wall of the square slot seat 7 is fixedly connected to both sides of the screw A10. The square blocks 9 have through holes 901 on both sides for the screw A10 to pass through. Nuts are threaded onto the outer side wall of the screw A10.

[0021] During installation, first align the lower area of ​​connecting block 5 with the connecting slot 6 and insert it. Then, rotate connecting block 5 to adjust the position of square block 9, align square block 9 with square slot 7 and insert it. After square block 9 is inserted into square slot 7, connecting block 5 is also fully inserted into connecting slot 6. At this time, screw A10 in square slot 7 passes through through hole 901 on square block 9. Then, rotate nut clockwise to install nut on screw A10. The nut moves downward along screw A10 and slowly abuts against the top of square block 9, thereby fixing square block 9 in square slot 7. This completes the installation of the force-saving transmission component 3. After installation, when worm gear 301 rotates, it will drive connecting slot 6 to rotate through connecting block 5 (at this time, the surface of connecting block 5 is in close contact with the inner surface of connecting slot 6), ultimately driving valve stem 2 to rotate. Conversely, remove the nut on screw A10, pull connecting block 5 out of connecting slot 6, and at the same time pull square block 9 out of square slot 7 to disassemble the force-saving transmission component 3.

[0022] Furthermore, the outer side wall of the support rod 17 is connected to the vertical plate 12 via a horizontal plate 11. The vertical plate 12 is internally threaded with a screw B13, and the head of the screw B13 is rotatably connected to the arc plate 15 via a bearing C14. A telescopic rod 16 is installed between the arc plate 15 and the vertical plate 12, and the telescopic rod 16 maintains the linear movement of the arc plate 15 relative to the vertical plate 12. Friction patterns are formed on the contact surface between the arc plate 15 and the connecting groove seat 6.

[0023] When it is necessary to fix the position of the valve stem 2 of the shut-off valve, rotate the screw B13 inside the vertical plate 12. Since the screw B13 is threadedly engaged with the vertical plate 12, the screw B13 will move axially. Its head, through the bearing C14, drives the arc-shaped plate 15 to move closer to the connecting slot 6 (the external shape of the connecting slot 6 is a cylinder coaxial with the valve stem 2). The telescopic rod 16 extends accordingly, so that the arc-shaped plate 15 always maintains a straight line movement. (The bearing C14, in conjunction with the telescopic rod 16, ensures that the arc-shaped plate 15 does not rotate with the screw B13 when it rotates, ensuring its straight line movement.) The valve stem 2 moves along the line until the inner side of the arc plate 15 is tightly fitted with the outer wall of the connecting groove seat 6. The friction texture on the contact surface increases the static friction between the two. The radial clamping force of the arc plate 15 on the connecting groove seat 6 restricts its rotation, and finally locks the position of the valve stem 2. When released, the screw B13 is rotated in the opposite direction, and the arc plate 15 moves away from the connecting groove seat 6 (the telescopic rod 16 is shortened), releasing the lock of the valve stem 2. This can prevent the valve stem 2 from rotating unexpectedly due to vibration, accidental contact or fluid pressure fluctuation, and further improve the safety and reliability of the gate valve.

[0024] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model in any way. Those skilled in the art can readily implement this utility model based on the accompanying drawings and the above description. However, any modifications, alterations, or equivalent variations made by those skilled in the art without departing from the scope of the utility model's technical solution, utilizing the disclosed technical content, are considered equivalent embodiments of this utility model. Furthermore, any equivalent changes, alterations, or variations made to the above embodiments based on the essential technology of this utility model are still within the protection scope of this utility model's technical solution.

Claims

1. A large-diameter, labor-saving adjustable shut-off valve, characterized in that: Includes a stop valve body (1), and a force-saving transmission assembly (3) is installed on the transmission end of the valve stem (2) of the stop valve body (1). The force-saving transmission assembly (3) includes a worm wheel (301) and a worm (302) that mesh with each other. The worm wheel (301) is connected to the valve stem (2). A handwheel (303) is installed at the end of the worm (302). By rotating the worm (302), the worm wheel (301) is driven to rotate, which in turn drives the valve stem (2) to rotate, thereby increasing the transmission ratio and reducing the regulating torque of the shut-off valve.

2. The large-diameter, labor-saving adjustable shut-off valve according to claim 1, characterized in that: The force-saving transmission assembly (3) further includes an L-shaped connecting plate (304), which has a horizontal part (3041) and a vertical part (3042) that are perpendicular to each other. A bearing A (305) is fixedly connected to the bottom surface of the horizontal part (3041), and a rotating rod A (306) is fixedly connected to the inner ring of the bearing A (305). The bottom end of the rotating rod A (306) is connected to the center of the top end of the worm gear (301). A bearing B (307) is fixedly connected to the surface of the vertical part (3042), and a rotating rod B (308) is fixedly connected to the inner ring of the bearing B (307). The rotating rod B (308) is connected to the other end of the worm gear (302) relative to the handwheel (303).

3. The large-diameter, labor-saving adjustable shut-off valve according to claim 2, characterized in that: The power-saving transmission component (3) is detachably connected to the valve body (1) of the shut-off valve.

4. The large-diameter, labor-saving adjustable shut-off valve according to claim 3, characterized in that: The bottom end of the worm gear (301) is connected to the connecting block (5) via the connecting rod (4), and the top end of the valve stem (2) is fixedly connected to the connecting slot seat (6) into which the connecting block (5) is inserted.

5. The large-diameter, labor-saving adjustable shut-off valve according to claim 4, characterized in that: The top of the valve body (1) of the shut-off valve is connected to the square slot seat (7) by the support rod (17) on both sides. The top of the transverse part (3041) is fixedly connected to the N-shaped plate (8), and square blocks (9) are welded to both ends of the N-shaped plate (8). The inner bottom wall of the square slot seat (7) is fixedly connected to the screw A (10) on both sides. The square block (9) has through holes (901) on both sides for the screw A (10) to pass through. Nuts are threaded on the outer side wall of the screw A (10).

6. The large-diameter, labor-saving adjustable shut-off valve according to claim 5, characterized in that: The outer side wall of the support rod (17) is connected to the vertical plate (12) via a horizontal plate (11). The vertical plate (12) is internally threaded with a screw B (13), and the head of the screw B (13) is rotatably connected to the arc plate (15) via a bearing C (14). Friction patterns are formed on the contact surface between the arc plate (15) and the connecting groove seat (6).

7. The large-diameter, labor-saving adjustable shut-off valve according to claim 6, characterized in that: A telescopic rod (16) is installed between the arc-shaped plate (15) and the vertical plate (12) to maintain the linear movement of the arc-shaped plate (15) relative to the vertical plate (12).

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