Gear transmission type eccentric ball valve
By adopting a gear-driven eccentric structure in the ball valve, the problem of reducing sealing properties and opening and closing efforts in long-term use of the hard sealed ball valve is solved, and frictionless opening and closing and high sealing performance are achieved.
Patent Information
- Application Number
- CN202422078792.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-27
- Publication Date
- 2025-03-18
- Estimated Expiration
- 2034-08-27
AI Technical Summary
During the long-term opening and closing of existing hard seal ball valves, the ball sealing surface and valve seat sealing surface are prone to wear, resulting in a decrease in sealing performance and increasing torque during opening and closing, which is laborious.
The gear-driven eccentric ball valve is adopted to separate the ball sealing surface from the valve seat sealing surface through the coordination of the gear disc and the eccentric wheel, avoid friction, and reduce the opening and closing torque through the gear transmission mechanism.
The frictionless opening and closing of the ball and the valve seat is achieved, which reduces the wear of the sealing surface, reduces the opening and closing torque, and improves the sealing performance and service life.
Smart Images
Figure CN222633879U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the field of valves, and in particular relates to a gear-driven eccentric ball valve. Background Art
[0002] The ball valve is a valve that uses a ball with a circular channel as the opening and closing part. The ball rotates with the valve stem to realize the opening and closing action. It is mainly used to open and close the pipeline and equipment media. It only needs to rotate 90 degrees and a very small torque to close tightly. Because the ball valve itself is compact and easy to operate and maintain, it is not only suitable for general working media such as water, solvents, acids and natural gas, but also for media with harsh working conditions, such as oxygen, hydrogen peroxide, methane and ethylene. In some high-temperature, high-pressure, and high-wear media working conditions, hard-sealed ball valves are usually used, that is, the ball and valve seat are both made of cemented carbide. The disadvantage is that due to the use of hard seals, the ball sealing surface and the valve seat sealing surface are prone to wear during the long-term opening and closing of the ball valve, resulting in a decrease in the sealing of the valve. In addition, if the ball sealing surface and the valve seat sealing surface fit too tightly, the torque will increase during opening and closing, causing difficulty in opening and closing. Summary of the invention
[0003] The utility model aims to provide a gear-driven eccentric ball valve with no friction between the ball and the valve seat and small opening and closing torque in view of the defects of the prior art.
[0004] The scheme of the utility model is: a gear-driven eccentric ball valve, which adopts a top-mounted structure, including a valve body, a valve seat, a valve stem, a ball, a valve cover, a handwheel and a gear transmission device, the valve cover is arranged at the upper end of the valve body and is fixed to the valve body by bolts, the ball is arranged in the valve cavity, and a valve seat is arranged between the right end of the ball and the valve body, and is characterized in that the valve cover and the bracket adopt an integrated structure, the gear transmission device comprises a bevel gear assembly, a handwheel, a valve stem, a gear plate and an eccentric wheel, the bevel gear assembly is installed above the bracket, the input gear of the bevel gear assembly is meshed with the input rod of the handwheel, the upper end of the valve stem is provided with gear teeth, the valve stem passes through the valve cover and the bracket, and the gear teeth at the upper end of the valve stem are meshed with the output gear of the bevel gear assembly; the valve stem The lower end is located in the valve cover cavity composed of the valve cover and the valve body. A fixing frame is arranged between the valve cover and the valve body. The fixing frame is hollow in design. The gear plate is arranged in the fixing frame. The gear plate is a wheel ring with an H-shaped cross-section. The upper outer ring surface of the gear plate is a gear structure. The lower end of the valve stem is provided with gear teeth meshing with the upper outer ring surface of the gear plate. An eccentric hole is arranged in the lower inner ring surface of the gear plate. The eccentric wheel is connected with the gear plate through the eccentric hole. A mounting hole is arranged in the middle of the eccentric wheel. A rotating shaft is fixed to the upper end of the ball valve, and the rotating shaft is inserted in the mounting hole of the eccentric wheel. A positioning shaft is arranged at the lower end of the ball body, and the positioning shaft is installed in the bearing at the bottom of the valve body. A packing is arranged between the valve stem and the valve cover, a packing gland is arranged above the packing, and a packing gland is arranged above the packing gland.
[0005] Preferably, a locking plate is provided between the sphere and the gear plate, the gear plate is provided with a pin hole, and the locking plate is connected to the gear plate via a pin shaft.
[0006] Preferably, a fixing ring is provided between the sphere and the fixing frame.
[0007] Preferably, the valve seat is provided with a groove, a graphite sealing ring is provided in the groove, and a sealing ring is provided between the valve seat and the valve body.
[0008] Preferably, a drain valve is provided in the left channel of the valve body.
[0009] The utility model has the advantages of high mechanical transmission efficiency through the gear transmission mechanism, and the eccentric hole of the gear plate cooperates with the eccentric wheel to provide excellent mechanical wedging force when the valve is closed, thereby ensuring the sealing performance. During the valve opening process, the eccentric principle is used to separate the spherical sealing surface from the valve seat, and there is no friction during the opening and closing process, resulting in little wear on the sealing surface and a small opening and closing torque. With the gear transmission method, the valve stem only performs rotational motion, resulting in less wear on the packing, excellent sealing performance and a long service life. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] Figure 1 It is a structural schematic diagram of the utility model.
[0011] In the figure, 1 is a valve body, 2 is a ball, 3 is a valve cover, 4 is a valve stem, 5 is a handwheel, 6 is a bevel gear assembly, 7 is a bracket, 8 is a fixed frame, 9 is a gear plate, 10 is an eccentric wheel, 11 is a locking plate, 12 is a fixing ring, 13 is a bearing, 14 is a positioning shaft, 15 is a valve seat, 16 is a sealing ring, 17 is a graphite sealing ring, 18 is a pin shaft, 19 is a rotating shaft, 20 is a packing, 21 is a packing gland, 22 is a packing gland, and 23 is a drain valve. DETAILED DESCRIPTION
[0012] The utility model is further described according to the accompanying drawings.
[0013] In the description of the present invention, it should be noted that the terms, "upper", "lower", "left", "right", "middle", "radial", "inner", "outer", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.
[0014] like Figure 1The gear-driven eccentric ball valve adopts a top-mounted structure, including a valve body 1, a valve seat 15, a valve stem 4, a ball 2, a valve cover 3, a handwheel 5 and a gear transmission device. The valve cover 3 is arranged at the upper end of the valve body 1 and fixed to the valve body 1 by bolts. The ball 2 is arranged in the valve cavity. A valve seat 15 is arranged between the right end of the ball 2 and the valve body 1. The sealing surface of the ball 2 is sealed with the valve seat 15. The valve cover 3 and the bracket 7 adopt an integrated structure to improve the overall structural strength; the gear transmission device includes a bevel gear assembly 6, a handwheel 5, a valve stem 4, a gear plate 9 and an eccentric wheel 10. The bevel gear assembly 6 is an existing common technology, so its specific structure is not described in detail; the bevel gear assembly 6 is installed above the bracket 7 and fixed to the bracket 7 by bolts. The input gear of the bevel gear assembly 6 is meshed with the input rod of the handwheel 5. The upper end of the valve stem 4 is provided with gear teeth. The valve stem 4 passes through the valve cover 3 and the bracket 7. The gear teeth at the upper end of the valve stem 4 are meshed with the output gear of the bevel gear assembly; The lower end of the valve stem 4 is located in the valve cover cavity formed by the valve cover 3 and the valve body 1. A fixing frame 8 is provided between the valve cover 3 and the valve body 1. The fixing frame 8 is installed on the radial step at the upper end of the valve body 1, and the fixing frame 8 is fixed and pressed by the valve cover 3. The fixing frame 8 is hollow in design, and a gear plate 9 is arranged in the fixing frame 8. The gear plate 9 is a wheel ring with an H-shaped cross section. The upper outer ring surface of the gear plate 9 is a gear structure. The lower end of the valve stem 4 is provided with gear teeth meshing with the upper outer ring surface of the gear plate 9. The lower end of the gear plate 9 is provided with a gear tooth meshing with the upper outer ring surface of the gear plate 9. An eccentric hole is arranged in the inner ring surface, and the eccentric wheel 10 is connected to the gear plate 9 through the eccentric hole. A mounting hole is arranged in the middle of the eccentric wheel 10. A rotating shaft 19 is fixed on the upper end of the ball valve, and the rotating shaft 19 is inserted in the mounting hole of the eccentric wheel 10. A positioning shaft 14 is arranged at the lower end of the ball body 2, and the positioning shaft 14 is installed in the bearing 13 at the bottom of the valve body 1. A packing 20 is arranged between the valve stem 4 and the valve cover 3, and a packing gland 21 is arranged above the packing 20, and a packing gland 22 is arranged above the packing gland 21. The hand wheel 5 is rotated to drive the input gear of the bevel gear to rotate, thereby driving the transmission rotation of the entire bevel gear assembly 6, and then the output gear of the bevel gear assembly 6 drives the valve stem 4 to rotate, the valve stem 4 drives the gear plate 9 to rotate, and the gear plate 9 drives the eccentric wheel 10 and the ball valve 2 to rotate eccentrically, so that when the ball valve is opened and closed again, the sealing surface of the ball body 2 is separated from the sealing surface of the valve seat 15, and frictionless opening and closing is realized.
[0015] A locking plate 11 is provided between the ball 2 and the gear plate 9. The gear plate 9 is provided with a pin hole. The locking plate 11 is connected to the gear plate 9 through a pin shaft 18. The locking plate 11 can utilize eccentric rotation to further strengthen the sealing between the sealing surface of the ball 2 and the sealing surface of the valve seat 15.
[0016] A fixing ring 12 is provided between the sphere 2 and the fixing frame 8 to ensure the stability of the sphere 2 when rotating.
[0017] The valve seat 15 is provided with a groove, a graphite sealing ring 17 is provided in the groove, and a sealing ring 16 is provided between the valve seat 15 and the valve body 1, providing three seals to further enhance the sealing performance of the ball valve.
[0018] A drain valve 23 is provided on the left channel of the valve body 1. After the valve cover 3 is opened to flush the inside of the valve body 1 and the ball 2, sewage can be discharged through the drain valve 23, which is convenient for cleaning and avoids the reduction of sealing performance of the ball 2 due to excessive impurities attached.
[0019] The above embodiments describe the present invention in detail, but the above contents are only preferred embodiments of the present invention and cannot be considered to limit the scope of implementation of the present invention. Any changes and improvements made within the scope of the present invention should still fall within the scope of the patent of the present invention.
Claims
1. A gear-driven eccentric ball valve, adopting a top-mounted structure, comprising a valve body (1), a valve seat (15), a valve stem (4), a ball (2), a valve cover (3), a hand wheel (5) and a gear transmission device, wherein the valve cover (3) is arranged at the upper end of the valve body (1) and is fixed to the valve body (1) by bolts, the ball (2) is arranged in the valve cavity, a valve seat (15) is arranged between the right end of the ball (2) and the valve body (1), and a sealing surface of the ball (2) is sealed with a sealing surface of the valve seat (15), ... and the valve body (2) is sealed with a sealing surface of the valve seat (15), and the valve body (2) is sealed with a hand wheel (5), and the valve body (1) is characterized in that: The valve cover (3) and the bracket (7) are of an integrated structure; the gear transmission device comprises a bevel gear assembly (6), a hand wheel (5), a valve stem (4), a gear plate (9) and an eccentric wheel (10); the bevel gear assembly (6) is mounted above the bracket (7); the input gear of the bevel gear assembly (6) meshes with the input rod of the hand wheel (5); the upper end of the valve stem (4) is provided with gear teeth; the valve stem (4) passes through the valve cover (3) and the bracket (7); the gear teeth at the upper end of the valve stem (4) mesh with the output gear of the bevel gear assembly; the lower end of the valve stem (4) is located in a valve cover cavity formed by the valve cover (3) and the valve body (1); a fixing frame (8) is provided between the valve cover (3) and the valve body (1); the valve cover (3) fixes and presses the fixing frame (8) into the valve body (1); the fixing frame (8) is of a hollow design; the gear plate (9) is arranged in a fixed position; In the fixed frame (8), the gear plate (9) is a wheel ring with an H-shaped cross section. The upper outer ring surface of the gear plate (9) is a gear structure. The lower end of the valve stem (4) is provided with gear teeth meshing with the upper outer ring surface of the gear plate (9). The lower inner ring surface of the gear plate (9) is provided with an eccentric hole. The eccentric wheel (10) is connected to the gear plate (9) through the eccentric hole. The middle of the eccentric wheel (10) is provided with a mounting hole. The upper end of the ball valve is fixed with a rotating shaft (19). The rotating shaft (19) is inserted into the mounting hole of the eccentric wheel (10). The lower end of the ball body (2) is provided with a positioning shaft (14). The positioning shaft (14) is installed in a bearing (13) at the bottom of the valve body (1). A packing (20) is provided between the valve stem (4) and the valve cover (3). A packing gland (21) is provided above the packing gland (20). A packing gland (22) is provided above the packing gland (21).
2. The gear-driven eccentric ball valve according to claim 1 is characterized in that: A locking disk (11) is provided between the sphere (2) and the gear disk (9), the gear disk (9) is provided with a pin hole, and the locking disk (11) is connected to the gear disk (9) via a pin shaft (18).
3. The gear-driven eccentric ball valve according to claim 1 or 2, characterized in that: A fixing ring (12) is provided between the ball (2) and the fixing frame (8), the valve seat (15) is provided with a groove, a graphite sealing ring (17) is provided in the groove, and a sealing ring (16) is provided between the valve seat (15) and the valve body (1).
4. The gear-driven eccentric ball valve according to claim 3 is characterized in that: A drain valve (23) is provided below the left channel of the valve body (1).