A micro-torque bellows hard seal fixed ball valve

Abstract

The utility model relates to the technical field of hard-seal fixed ball valves, and discloses a micro-torque bellows hard-seal fixed ball valve, comprising a valve body and a valve cover, wherein the valve cover is fixedly mounted on the top of the valve body, a valve stem is movably arranged inside the valve cover, the top end of the valve stem extends out from the valve cover, a connecting shaft is fixedly sleeved on the bottom end of the valve stem, a wedge-shaped valve plate is fixedly mounted on the bottom end of the connecting shaft through a bearing, a valve seat is fixedly mounted on the inner wall of the valve body, a sphere in the ball valve is arranged into a wedge-shaped valve plate and a hemisphere, and when sealing is required, the connecting shaft is driven upward by the valve stem, thereby driving the wedge-shaped valve plate upward, so that the wedge-shaped valve plate presses two hemispheres tightly against the valve seat to achieve sealing, and because the hemispheres are pressed against the valve seat, there is no problem of the valve seat being worn due to the rotation of the hemispheres, thereby avoiding the problem of poor sealing due to the wear of the ball and the valve seat after the ball valve is used for a long time.

Description

Technical Field

[0001] The utility model relates to the technical field of hard-sealed fixed ball valves, in particular to a micro-torque bellows hard-sealed fixed ball valve. Background Art

[0002] Bellows sealed ball valves are widely used in chemical industry, chemical fiber textile, plastic papermaking, electric power, steel and other fields. They are mainly used in situations where leakage is not allowed (especially external leakage is absolutely not allowed) but ball valves are needed. They are particularly suitable for volatile, toxic, flammable, explosive and other gases or industrial flows. When operating the ball valve, the valve stem needs to be rotated to drive the ball to rotate to achieve the opening and closing of the ball valve. This method requires ensuring that the ball and the valve seat are closely matched to ensure the sealing effect. However, after a long period of opening and closing, the ball and the valve seat will be worn, which can easily lead to a gap between the ball and the valve seat, thereby causing the sealing effect to deteriorate. Summary of the invention

[0003] The utility model aims to provide a micro-torque bellows hard-seal fixed ball valve to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a micro-torque bellows hard-seal fixed ball valve, comprising a valve body and a valve cover, wherein the valve cover is fixedly mounted on the top of the valve body, a valve stem is movably arranged inside the valve cover, the top end of the valve stem extends out from the valve cover, a connecting shaft is fixedly sleeved on the bottom end of the valve stem, a wedge-shaped valve plate is fixedly mounted on the bottom end of the connecting shaft through a bearing, a valve seat is fixedly mounted on the inner wall of the valve body, two valve seats are arranged and are respectively located at the inlet and outlet of the valve body, and the inner wall of the valve body is provided with a valve seat. The wall is provided with a hemisphere, and there are two hemispheres, which correspond to the valve seats one by one. The inner wall of the valve body is fixedly installed with a shaft sleeve, and the shaft sleeve is rotatably sleeved on the outer wall of the bottom end of the wedge-shaped valve plate. The outer wall of the valve stem is rotatably sleeved with a separation sleeve, and the outer wall of the valve stem is sleeved with an inner bellows, the top end of the inner bellows is fixedly connected to the inner wall of the valve cover, the bottom end of the inner bellows is fixedly connected to the bottom inner wall of the separation sleeve, the top outer wall of the separation sleeve is fixedly installed with an outer bellows, and the bottom end of the outer bellows is fixedly connected to the inner wall of the valve cover.

[0005] Furthermore, a fixed shaft is provided on the bottom inner wall of the valve body, the top end of the fixed shaft is inserted into the bottom of the wedge-shaped valve plate, a ball is provided between the outer wall of the fixed shaft and the inner wall of the wedge-shaped valve plate, the fixed shaft is fixedly connected to the valve body by bolts, and a gasket is provided between the fixed shaft and the valve body.

[0006] Furthermore, the valve cover is fixedly connected to the valve body by means of screw 1, a nut 1 is threadedly sleeved on the outer wall of the screw 1, and a gasket 2 is provided at the connection between the valve body and the valve cover.

[0007] Furthermore, a cover plate is fixedly provided on the top of the valve cover, a packing is filled between the inner wall of the cover plate and the outer wall of the valve stem, the top pressure cover of the packing is provided with a packing pressure cover, the top pressure cover of the packing pressure cover is provided with a packing pressure plate, the packing pressure plate is fixedly connected to the cover plate by screw two, a nut two is threadedly sleeved on the outer wall of the screw two, and a disc spring is provided between the nut two and the packing pressure plate.

[0008] Furthermore, the packing is provided with two layers, an upper layer and a lower layer, and a gasket is provided between the two layers of packing, and a gasket three is provided between the cover plate and the valve cover.

[0009] Furthermore, a bracket is fixedly provided on the top of the cover plate, a worm gear reducer is fixedly installed on the top of the bracket, and an output end of the worm gear reducer is fixedly connected to the top end of the valve stem.

[0010] Compared with the prior art, the beneficial effects of the utility model are:

[0011] The ball in the ball valve is configured as a wedge-shaped valve plate and a hemisphere. When sealing is required, the valve stem drives the connecting shaft upward, thereby driving the wedge-shaped valve plate upward, so that the wedge-shaped valve plate presses the two hemispheres tightly against the valve seat to achieve sealing. Since the hemispheres are pressed against the valve seat, there is no problem of the valve seat being worn due to the rotation of the hemispheres, thus avoiding the problem of poor sealing due to the wear of the ball and the valve seat after long-term use of the ball valve;

[0012] A separation sleeve is provided to separate and connect the outer bellows and the inner bellows, so that the outer bellows and the inner bellows rotate relatively when the valve stem rotates, but the top and bottom ends of the outer bellows and the inner bellows will not be twisted significantly, thereby ensuring the sealing effect between the valve stem and the valve cover while ensuring that the valve stem can rotate. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the utility model;

[0014] Figure 2 For this utility model Figure 1 The structural diagram of the lower section;

[0015] Figure 3 For this utility model Figure 1 Schematic diagram of the structure of the middle section;

[0016] Figure 4 For this utility model Figure 1 Schematic diagram of the structure of the upper section.

[0017] In the figure: 1. valve body; 2. valve cover; 3. wedge-shaped valve plate; 4. hemispherical body; 5. valve seat; 6. fixed shaft; 7. valve stem; 8. connecting shaft; 9. outer bellows; 10. inner bellows; 11. bearing; 12. gasket 1; 13. bolt; 14. screw 1; 15. nut 1; 16. gasket 2; 17. gasket 3; 18. cover plate; 19. packing; 20. packing gland; 21. packing pressure plate; 22. disc spring; 23. screw 2; 24. nut 2; 25. bracket; 26. washer; 27. shaft sleeve; 28. separation sleeve. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0019] See also Figure 1-Figure 4 The utility model provides a technical solution: a micro-torque bellows hard-seal fixed ball valve, comprising a valve body 1 and a valve cover 2. The valve cover 2 is fixedly mounted on the top of the valve body 1. A valve stem 7 is movably arranged inside the valve cover 2. The top of the valve stem 7 extends out of the valve cover 2. A connecting shaft 8 is fixedly sleeved at the bottom end of the valve stem 7. A wedge-shaped valve plate 3 is fixedly mounted at the bottom end of the connecting shaft 8 through a bearing 11. A valve seat 5 is fixedly mounted on the inner wall of the valve body 1. Two valve seats 5 are arranged and are respectively located at the valve body 1 and the valve seat 5 is fixedly mounted on the inner wall of the valve body 1. 1, the inner wall of the valve body 1 is provided with a hemispherical body 4, two hemispherical bodies 4 are provided, and they correspond to the valve seats 5 one by one, the inner wall of the valve body 1 is fixedly installed with a shaft sleeve 27, the shaft sleeve 27 is rotatably sleeved on the outer wall of the bottom end of the wedge-shaped valve plate 3, the outer wall of the valve stem 7 is rotatably sleeved with a separation sleeve 28, the outer wall of the valve stem 7 is sleeved with an inner bellows 10, the top end of the inner bellows 10 is fixedly connected to the inner wall of the valve cover 2, and the bottom end of the inner bellows 10 is fixedly connected to the bottom inner wall of the separation sleeve 28 , an outer bellows 9 is fixedly installed on the outer wall of the top of the separation sleeve 28, and the bottom end of the outer bellows 9 is fixedly connected to the inner wall of the valve cover 2. The separation sleeve 28 is provided to separate and connect the outer bellows 9 and the inner bellows 10, so that when the valve stem 7 rotates, the outer bellows 9 and the inner bellows 10 rotate relatively, but the top and bottom ends of the outer bellows 9 and the inner bellows 10 will not be twisted to a large extent. Under the condition that the valve stem 7 can rotate, the sealing effect between the valve stem 7 and the valve cover 2 is ensured, and the ball in the ball valve is arranged as a wedge-shaped valve plate 3 and a hemispherical body 4. When sealing is required, the connecting shaft 8 is driven upward by the valve stem 7, and then the wedge-shaped valve plate 3 is driven upward, so that the wedge-shaped valve plate 3 presses the two hemispherical bodies 4 tightly on the valve seat 5 to achieve sealing. Because the hemispherical bodies 4 are pressed on the valve seat 5, there is no problem of the valve seat 5 being worn by the hemispherical body 4 due to rotation, so as to avoid the problem of poor sealing due to the wear of the ball and the valve seat 5 after the ball valve is used for a long time;

[0020] A fixed shaft 6 is arranged on the bottom inner wall of the valve body 1, and the top end of the fixed shaft 6 is inserted into the bottom of the wedge-shaped valve plate 3. The auxiliary connecting shaft 8 positions the wedge-shaped valve plate 3 to ensure that the wedge-shaped valve plate 3 does not move horizontally relative to the valve body 1. A ball bearing is arranged between the outer wall of the fixed shaft 6 and the inner wall of the wedge-shaped valve plate 3 to reduce the friction between the wedge-shaped valve plate 3 and the fixed shaft 6 when the wedge-shaped valve plate 3 rotates. The fixed shaft 6 is fixedly connected to the valve body 1 by bolts 13, and a gasket 12 is arranged between the fixed shaft 6 and the valve body 1.

[0021] The valve cover 2 is fixedly connected to the valve body 1 by means of a screw 14, a nut 15 is provided on the outer threaded sleeve of the screw 14, and a gasket 16 is provided at the connection between the valve body 1 and the valve cover 2;

[0022] A cover plate 18 is fixedly arranged on the top of the valve cover 2, and a packing 19 is filled between the inner wall of the cover plate 18 and the outer wall of the valve stem 7. The cover plate 18 and the packing 19 are arranged to ensure the sealing effect between the valve stem 7 and the valve cover 2. A packing gland 20 is provided on the top of the packing gland 19, and a packing pressure plate 21 is provided on the top of the packing gland 20 to prevent the packing 19 from leaking. The packing pressure plate 21 is fixedly connected to the cover plate 18 by a screw 23. A nut 24 is provided on the outer wall thread sleeve of the screw 23. A disc spring 22 is provided between the nut 24 and the packing pressure plate 21. The disc spring 22 is provided to prevent the nut 24 from loosening due to vibration.

[0023] The packing 19 is provided with two layers, an upper layer and a lower layer, and a gasket 26 is provided between the two layers of packing 19, and a gasket 3 17 is provided between the cover plate 18 and the valve cover 2;

[0024] A bracket 25 is fixedly provided on the top of the cover plate 18, a worm gear reducer is fixedly installed on the top of the bracket 25, and the output end of the worm gear reducer is fixedly connected to the top end of the valve stem 7 for controlling the movement of the valve stem 7 to realize the opening and closing of the valve.

[0025] Working principle: When in use, when the valve needs to be closed, the valve stem 7 is moved to drive the connecting shaft 8 to move upward, and then the wedge-shaped valve plate 3 is moved upward. The upward movement of the wedge-shaped valve plate 3 pushes the two hemispheres 4 toward the valve seat 5 to achieve sealing. When the valve needs to be opened, the valve stem 7 is moved to drive the connecting shaft 8 to move downward, and then the wedge-shaped valve plate 3 is moved downward, so that the fit between the hemisphere 4 and the valve seat 5 is loosened, and then the valve stem 7 is rotated to drive the connecting shaft 8 to rotate, and then the wedge-shaped valve plate 3 is driven to rotate, and the angle between the channel on the wedge-shaped valve plate 3 and the hemisphere 4 is changed to achieve the adjustment of the valve opening (the role of the ball and the valve seat in a conventional ball valve).

[0026] Based on the embodiments of the present utility model, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present utility model.

Claims

1. A micro-torque bellows hard-seal fixed ball valve, comprising a valve body (1) and a valve cover (2), characterized in that: The valve cover (2) is fixedly mounted on the top of the valve body (1); a valve stem (7) is movably arranged inside the valve cover (2); the top end of the valve stem (7) protrudes from the valve cover (2); a connecting shaft (8) is fixedly sleeved on the bottom end of the valve stem (7); a wedge-shaped valve plate (3) is fixedly mounted on the bottom end of the connecting shaft (8) via a bearing (11); a valve seat (5) is fixedly mounted on the inner wall of the valve body (1); two valve seats (5) are provided and are respectively located at the inlet and outlet of the valve body (1); and a hemispherical body (4) is provided on the inner wall of the valve body (1); two hemispherical bodies (4) are provided and are in contact with the valve seat (5). ), the inner wall of the valve body (1) is fixedly mounted with a shaft sleeve (27), the shaft sleeve (27) is rotatably sleeved on the outer wall of the bottom end of the wedge-shaped valve plate (3), the outer wall of the valve stem (7) is rotatably sleeved with a separation sleeve (28), the outer wall of the valve stem (7) is sleeved with an inner bellows (10), the top end of the inner bellows (10) is fixedly connected to the inner wall of the valve cover (2), the bottom end of the inner bellows (10) is fixedly connected to the bottom inner wall of the separation sleeve (28), the top outer wall of the separation sleeve (28) is fixedly mounted with an outer bellows (9), the bottom end of the outer bellows (9) is fixedly connected to the inner wall of the valve cover (2).

2. A micro-torque bellows hard-seal fixed ball valve according to claim 1, characterized in that: A fixed shaft (6) is arranged on the inner wall of the bottom of the valve body (1), the top end of the fixed shaft (6) is inserted into the bottom of the wedge-shaped valve plate (3), a ball bearing is arranged between the outer wall of the fixed shaft (6) and the inner wall of the wedge-shaped valve plate (3), the fixed shaft (6) is fixedly connected to the valve body (1) by means of bolts (13), and a gasket (12) is arranged between the fixed shaft (6) and the valve body (1).

3. The micro-torque bellows hard-seal fixed ball valve according to claim 1, characterized in that: The valve cover (2) is fixedly connected to the valve body (1) via a screw (14); a nut (15) is provided on the outer wall thread sleeve of the screw (14); and a gasket (16) is provided at the connection between the valve body (1) and the valve cover (2).

4. The micro-torque bellows hard-seal fixed ball valve according to claim 1, characterized in that: A cover plate (18) is fixedly arranged on the top of the valve cover (2), a packing (19) is filled between the inner wall of the cover plate (18) and the outer wall of the valve stem (7), a packing cover (20) is pressed on the top of the packing (19), a packing pressure plate (21) is pressed on the top of the packing pressure cover (20), the packing pressure plate (21) is fixedly connected to the cover plate (18) by means of a second screw (23), a second nut (24) is threadedly sleeved on the outer wall of the second screw (23), and a disc spring (22) is arranged between the second nut (24) and the packing pressure plate (21).

5. The micro-torque bellows hard-seal fixed ball valve according to claim 4, characterized in that: The packing (19) is provided with two layers, an upper layer and a lower layer, and a gasket (26) is provided between the two layers of packing (19), and a gasket three (17) is provided between the cover plate (18) and the valve cover (2).

6. The micro-torque bellows hard-seal fixed ball valve according to claim 4, characterized in that: A bracket (25) is fixedly provided on the top of the cover plate (18), a worm gear reducer is fixedly installed on the top of the bracket (25), and the output end of the worm gear reducer is fixedly connected to the top end of the valve stem (7).

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