A two-stage metal hard seal ball valve

Abstract

The present invention discloses a double-stage metal hard-sealed ball valve, which relates to the field of ball valves, including a valve body, an external pipe, a mounting seat and a hollow ball. The left and right ends of the valve body are both provided with external pipes for mounting the valve body, and a mounting seat is fixed above the valve body, and a hollow ball is arranged inside the valve body to control the on-off of the valve body. The hollow ball and the valve body are rotatably connected, and a control shaft is connected above the hollow ball, and the upper end of the control shaft passes through the upper surface of the mounting seat, and the upper end of the control shaft is connected to a mounting block, and a support plate is fixed below the mounting block, and the lower end of the support plate is fixedly connected to the mounting seat. The double-stage metal hard-sealed ball valve can seal between the hollow ball and the external pipe by setting a sealing ring, thereby preventing the medium from entering the outside of the hollow ball and causing leakage, and the connection between the sealing ring and the hollow ball can also play a limiting effect on the hollow ball, thereby improving the stability of the valve body.

Description

Technical Field

[0001] The invention relates to the technical field of ball valves, in particular to a double-stage metal hard-sealed ball valve. Background Art

[0002] A two-stage metal hard-sealed ball valve generally refers to a ball valve whose valve seat and ball cover material are metal to metal. It can adapt to the on-off control of the delivery of high-temperature and high-pressure media, and can be operated manually, electrically and pneumatically. The application number is CN202110709280.3. A two-stage metal hard-sealed ball valve disclosed on August 24, 2021, includes: a valve body, a ball and a driving component; the ball is arranged inside the valve body for controlling the on-off of the valve body; the driving component is arranged on the valve body for driving the ball to rotate in one direction. A sealing valve seat is arranged inside the valve body, and the ball is rotatably arranged inside the sealing valve seat; both ends of the sealing valve seat are installed in the mounting grooves on the valve body through metal sealing gaskets, and the ball is driven to rotate unidirectionally by a driving component, so that the ball can rotate unidirectionally during the switching process, so that the entire sealing surface of the ball can contact with the sealing part inside the valve body during the rotation process, thereby avoiding the reciprocating rotation of the ball during use in the prior art, so that only part of the sealing surface of the ball is involved in the sealing, and the present invention effectively improves the service life of the valve; the application number is CN201920134153.3, and an efficient metal hard-sealed ball valve disclosed on March 13, 2020, includes a valve body and a sleeve, the sleeve is communicatively connected to the upper end of the valve body, a valve stem is arranged through the interior of the sleeve, and a gasket filler is arranged between the valve stem and the inner wall of the sleeve, and a water inlet is arranged at one end of the valve body. The highly efficient metal hard-sealed ball valve described in the present application can disassemble the internal limit block and the arc block, thereby realizing the installation and disassembly of the internal through ball, which is conducive to the detection and replacement of various internal parts, and can be tightly combined with the through ball. Compared with the traditional O-shaped gasket, the contact between the arcs is tighter. At the same time, the arc block is easy to install and disassemble, and can be replaced regularly, ensuring the high efficiency of the ball valve, and can make the through ball contact with the valve body stably, and at the same time effectively avoid the leakage caused by the loose contact between the through ball and the arc block, which has certain practicality and brings better use prospects;

[0003] The current two-stage metal hard-sealed ball valve has a metal hard seal between the valve body. When the ball in the valve body rotates, there will be corresponding friction. With the increase of usage time and the increase of wear, the sealing effect of the valve will gradually decrease, and the corresponding friction resistance will also increase the force required for ball valve control, reducing its service life and flexibility of use. Summary of the invention

[0004] The purpose of the present invention is to provide a two-stage metal hard-sealed ball valve to solve the problem that the current two-stage metal hard-sealed ball valve proposed in the above background technology has metal hard seals between the valve bodies. When the ball in the valve body rotates during use, there will be corresponding friction. With the increase of use time and the increase of wear, the sealing effect of the valve will gradually decrease, and the corresponding friction resistance will also increase the force required for ball valve control.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a two-stage metal hard-sealed ball valve, comprising a valve body, an external pipe, a mounting seat and a hollow ball, the left and right ends of the valve body are provided with external pipes for mounting the valve body, and a mounting seat is fixed above the valve body, and a hollow ball is arranged inside the valve body to control the on-off of the valve body, a rotation connection is formed between the hollow ball and the valve body, and a control shaft is connected above the hollow ball, and the upper end of the control shaft passes through the upper surface of the mounting seat, the upper end of the control shaft is connected to a mounting block, and a support plate is fixed below the mounting block, and the lower end of the support plate The end is fixedly connected to the mounting seat, the upper end of the control shaft is connected with a rotation control mechanism to provide control for the rotation of the hollow ball, the inner end of the external tube is sleeved with a sealing ring, and the end of the sealing ring facing the hollow ball is in contact with the surface of the hollow ball to provide a seal for the outside of the hollow ball, an elastic sealing gasket is fixed to the side of the sealing ring facing the outer end of the external tube to seal the connection between the sealing ring and the external tube, an air pressure chamber is provided at the outer end of the sealing ring, and the air pressure chamber is annularly opened inside the external tube, and an air pressure control mechanism is provided above the air pressure chamber to control the movement of the sealing ring by the air pressure control mechanism.

[0006] To further optimize the technical solution, a rotating shaft is fixed to the lower end of the hollow ball, and a rotating connection is formed between the rotating shaft and the valve body to provide rotational positioning for the hollow ball.

[0007] To further optimize the technical solution, the external pipe and the valve body are detachably connected, and the inner end of the external pipe and the outer end of the valve body are both fixed with mounting docking plates, and the external pipe and the valve body are connected by the mounting docking plates.

[0008] To further optimize the technical solution, the air pressure control mechanism includes a communication port, a connection cover, an air pressure plug and a vertical drive mechanism;

[0009] A communication port is provided above the air pressure chamber;

[0010] A connecting cover is fixed on the outer surface of the external pipe, and the interior of the connecting cover and the connecting port are connected to each other;

[0011] The air pressure plug is arranged inside the connection cover, and the radial outer side of the air pressure plug is arranged in close contact with the inner wall of the connection cover;

[0012] The vertical driving mechanism is connected to the air pressure plug to control the connection of the air pressure plug.

[0013] To further optimize the technical solution, the vertical drive mechanism includes a control head, a through slot, a drive plate, a hollow slot and a manual controller;

[0014] The control head is fixed on the upper part of the air pressure plug, and an up-and-down sliding structure is formed between the control head and the connecting cover;

[0015] A through slot is provided above the control head;

[0016] The driving plate is arranged above the mounting seat, and the end of the driving plate is inserted into the through slot, and the supporting plate passes through the driving plate to form an up-and-down sliding structure;

[0017] A hollow groove is provided in the middle of the driving plate, and the control shaft passes through the driving plate through the hollow groove;

[0018] The manual controller is connected to the driving plate to control the movement of the driving plate.

[0019] To further optimize the technical solution, the manual controller is composed of a control rod, the control rod passes through the drive plate and forms a threaded connection between the drive plates, and the control rod is actively installed above the mounting seat.

[0020] To further optimize the technical solution, the rotation control mechanism includes a worm gear, a worm and a control hand wheel;

[0021] The worm gear is fixed above the control shaft, and a rotation connection is formed between the control shaft and the mounting block;

[0022] A worm is arranged on the outer side of the worm wheel and is meshed with the worm wheel, and the worm wheel is rotationally connected with the mounting block;

[0023] A control hand wheel is fixed to the outer end of the worm to control the rotation of the worm.

[0024] To further optimize the technical solution, a rotation limiting mechanism is provided on the outer side of the worm wheel to limit the rotation of the worm wheel and maintain the stability of the position of the hollow ball.

[0025] To further optimize the technical solution, the rotation limiting mechanism includes a transmission plate and a limiting block;

[0026] The transmission plate is fixed above the driving plate, and the upper end of the transmission plate is located inside the mounting block and between the mounting blocks to form an up-and-down sliding structure;

[0027] The limit block is arranged above the worm wheel, and the lower part of the limit block is made of rubber material, and the limit block is fixedly connected to the upper end of the transmission plate.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] The hollow ball and the external pipe can be sealed by setting the sealing ring, so as to prevent the medium from entering the outside of the hollow ball and causing leakage. The connection between the sealing ring and the hollow ball can also limit the position of the hollow ball and improve the stability of the valve body.

[0030] The connection between the sealing ring and the external pipe is sealed by an elastic sealing pad, and the air pressure cavity at the outer end of the sealing ring can control the movement of the sealing ring by air pressure, thereby controlling the connection between the sealing ring and the hollow ball. When the hollow ball is controlled to rotate, the connection between the sealing ring and the hollow ball can be released, thereby reducing the friction of the sealing ring and maintaining its sealing effect.

[0031] The external pipe can be disassembled from the valve body by installing the docking plate. After the external pipe is disassembled, the hollow ball can be leaked out, and the valve body can be inspected and repaired. At the same time, the sealing ring can also be leaked out, and the sealing ring can be inspected and maintained to ensure its subsequent sealing effect. It can also be replaced when damaged;

[0032] The air pressure in the air pressure chamber is controlled by the movement of the driving plate, and the driving plate is detachably connected to the control head through the through slot. When the external tube is subsequently disassembled, the driving plate can also be taken out of the through slot, and the driving plate can synchronously control the air pressure of the air pressure chambers in the two sets of external tubes, thereby improving the convenience of subsequent operations.

[0033] The rotation of the worm wheel can be limited by the limit block, thereby blocking the rotation of the control shaft. When the air pressure in the air pressure chamber is reduced, the drive plate moves upward, which can simultaneously drive the limit block to move upward, release the connection between the limit block and the worm wheel, and make the worm wheel rotatable. Then the hollow ball can be controlled by the control hand wheel. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0035] Figure 2 It is a side view structural schematic diagram of the present invention;

[0036] Figure 3 It is a bottom view structural schematic diagram of the present invention;

[0037] Figure 4 This is a schematic diagram of the three-dimensional structure of the valve body of the present invention;

[0038] Figure 5 This is a schematic diagram of the three-dimensional structure of the external tube of the present invention;

[0039] Figure 6 This is a schematic diagram of the main cross-sectional structure of the valve body of the present invention;

[0040] Figure 7 This is a schematic diagram of the main cross-sectional structure of the external pipe of the present invention;

[0041] Figure 8 This is a schematic diagram of the top-sectional structure of the mounting block of the present invention;

[0042] Fig. 9 This is a schematic diagram of the main cross-sectional structure of the installation block of the present invention;

[0043] Fig.10 It is a schematic diagram of the three-dimensional structure of the driving plate of the present invention.

[0044] In the figure: 1. valve body; 2. external pipe; 3. mounting seat; 4. hollow ball; 5. control shaft; 501, rotating shaft; 6. mounting block; 7. worm gear; 8. worm; 9. control hand wheel; 10. mounting docking plate; 11. support plate; 12. sealing ring; 13. elastic sealing pad; 14. air pressure chamber; 15. connecting port; 16. connecting cover; 17. air pressure plug; 18. control head; 19. through groove; 20. drive plate; 21. hollow groove; 22. control rod; 23. transmission plate; 24. limit block. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] See also Figure 1-Figure 10 The present invention provides the following technical solution: a two-stage metal hard-sealed ball valve, comprising a valve body 1, an external pipe 2, a mounting seat 3 and a hollow ball 4, the left and right ends of the valve body 1 are provided with external pipes 2 for mounting the valve body 1, and the mounting seat 3 is fixed above the valve body 1, and the inside of the valve body 1 is provided with a hollow ball 4 to control the on-off of the valve body 1; Embodiment 1:

[0047] The invention provides a technical solution, which discloses that a rotation connection is formed between the hollow ball 4 and the valve body 1, and a control shaft 5 is connected to the top of the hollow ball 4, and the upper end of the control shaft 5 passes through the upper surface of the mounting seat 3, the upper end of the control shaft 5 is connected to the mounting block 6, and a support plate 11 is fixed to the bottom of the mounting block 6, and the lower end of the support plate 11 is fixedly connected to the mounting seat 3, and the upper end of the control shaft 5 is connected to a rotation control mechanism to provide control for the rotation of the hollow ball 4, and the inner end of the external pipe 2 is sleeved with a sealing ring 12, and the end of the sealing ring 12 facing the hollow ball 4 and the surface of the hollow ball 4 are mutually fitted to provide sealing for the outer side of the hollow ball 4, and the sealing ring 12 faces the outer end of the external pipe 2. An elastic sealing pad 13 is fixed on the side to seal the connection between the sealing ring 12 and the external tube 2. An air pressure chamber 14 is provided at the outer end of the sealing ring 12, and the air pressure chamber 14 is annularly opened inside the external tube 2. An air pressure control mechanism is provided above the air pressure chamber 14, and the movement of the sealing ring 12 is controlled by the air pressure control mechanism. A rotating shaft 501 is fixed at the lower end of the hollow ball 4, and a rotating connection is formed between the rotating shaft 501 and the valve body 1 to provide rotational positioning for the hollow ball 4. A detachable connection is formed between the external tube 2 and the valve body 1, and a mounting docking plate 10 is fixed to the inner end of the external tube 2 and the outer end of the valve body 1, and the external tube 2 and the valve body 1 are connected by mounting the docking plate 10;

[0048] When in use, the valve body 1 can be connected to the pipeline through the external tube 2, and the control shaft 5 can be driven to rotate through the rotation control mechanism. The hollow ball 4 is controlled to rotate through the control shaft 5, and the corresponding on-off control is performed through the rotation of the hollow ball 4. After the position of the hollow ball 4 is maintained, the valve body 1 is sealed by the fit between the sealing ring 12 and the hollow ball 4, and the fitting force of the sealing ring 12 comes from the gas pressure in the air pressure chamber 14. When it is necessary to control the rotation of the hollow ball 4 in the future, the air pressure in the air pressure chamber 14 can be reduced first to release the contact between the sealing ring 12 and the hollow ball 4, and then the hollow ball 4 can be operated to rotate. Embodiment 2:

[0049] On the basis of the first embodiment, a pneumatic control mechanism is disclosed, which includes a connecting port 15, a connecting cover 16, a pneumatic plug 17 and a vertical driving mechanism. The connecting port 15 is opened above the pneumatic chamber 14. The connecting cover 16 is fixed to the outer surface of the external pipe 2, and the interior of the connecting cover 16 and the connecting port 15 are connected to each other. The pneumatic plug 17 is arranged inside the connecting cover 16, and the radial outer side of the pneumatic plug 17 is arranged to fit the inner wall of the connecting cover 16. The vertical driving mechanism is connected to the pneumatic plug 17 to control the connection of the pneumatic plug 17. The vertical driving mechanism includes a control head 18, a through groove 19, a driving plate 20, a hollow groove 21 and a manual controller. The control head 18 fixes the pneumatic plug 17. , and a vertical sliding structure is formed between the control head 18 and the connecting cover 16, a through slot 19 is opened above the control head 18, a driving plate 20 is arranged above the mounting seat 3, and the end of the driving plate 20 is inserted into the through slot 19, the support plate 11 passes through the driving plate 20 to form an up and down sliding structure, a hollow slot 21 is opened in the middle of the driving plate 20, the control shaft 5 passes through the driving plate 20 through the hollow slot 21, a manual controller is connected to the driving plate 20 to control the movement of the driving plate 20, and the manual controller is composed of a control rod 22, the control rod 22 passes through the driving plate 20 and the driving plate 20 is threadedly connected, and the control rod 22 is actively installed above the mounting seat 3;

[0050] The external pipe 2 can be installed or removed from the valve body 1 by installing the docking plate 10. After the external pipe 2 is removed, the sealing ring 12 and the hollow ball 4 can leak out, which is convenient for inspection and maintenance. When it is necessary to control the sealing ring 12 to move, the control rod 22 can be rotated. When the control rod 22 rotates, it drives the driving plate 20 to move through the threaded connection between the driving plate 20. When the driving plate 20 moves downward, it drives the control head 18 and the air pressure plug 17 to move downward through the through groove 19. The air pressure plug 17 presses the gas in the connecting cover 16 into the air pressure chamber 14 through the connecting port 15. The increased air pressure in the air pressure chamber 14 pushes the sealing ring 12 to move, so that the sealing ring 12 and the hollow ball 4 are fitted together. When the control driving plate 20 moves upward, the air pressure in the air pressure chamber 14 decreases, and the sealing ring 12 moves outward to break away from the fit with the hollow ball 4. At this time, the rotation of the hollow ball 4 can be controlled. Embodiment three:

[0051] On the basis of the second embodiment, a rotation control mechanism is disclosed, which includes a worm wheel 7, a worm 8 and a control hand wheel 9. The worm wheel 7 is fixed above the control shaft 5, and a rotation connection is formed between the control shaft 5 and the mounting block 6. The worm 8 is arranged on the outer side of the worm wheel 7 and meshes with the worm wheel 7, and a rotation connection is formed between the worm 8 and the mounting block 6. The control hand wheel 9 is fixed on the outer end of the worm 8 to control the rotation of the worm 8. A rotation limiting mechanism is arranged on the outer side of the worm wheel 7 to limit the rotation of the worm wheel 7 and keep the position of the hollow ball 4 stable. The rotation limiting mechanism includes a transmission plate 23 and a limiting block 24. The transmission plate 23 is fixed above the driving plate 20, and the upper end of the transmission plate 23 is located inside the mounting block 6 and between the mounting block 6 to form an up and down sliding structure. The limiting block 24 is arranged above the worm wheel 7, and the lower part of the limiting block 24 is made of rubber material, and the limiting block 24 is fixedly connected to the upper end of the transmission plate 23.

[0052] When the driving plate 20 moves downward so that the sealing ring 12 and the hollow ball 4 are fitted together, the driving plate 20 drives the limit block 24 to move downward through the transmission plate 23, so that the limit block 24 and the worm gear 7 come into contact, and the rotation of the worm gear 7 is limited, thereby maintaining the stability of the hollow ball 4. When the driving plate 20 moves upward so that the sealing ring 12 is separated from the fitting of the hollow ball 4, the driving plate 20 drives the limit block 24 to move upward through the transmission plate 23, and the limiting effect of the limit block 24 on the worm gear 7 is released. Then, the hollow ball 4 can be controlled by controlling the rotation of the hand wheel 9.

[0053] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0054] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A two-stage metal hard-sealed ball valve, comprising a valve body (1), an external pipe (2), a mounting seat (3) and a hollow ball (4), wherein the left and right ends of the valve body (1) are both provided with external pipes (2) for mounting the valve body (1), and the mounting seat (3) is fixed above the valve body (1), and the interior of the valve body (1) is provided with a hollow ball (4) for controlling the on-off of the valve body (1); Features: The hollow ball (4) and the valve body (1) are connected in rotation, and a control shaft (5) is connected to the top of the hollow ball (4), and the upper end of the control shaft (5) passes through the upper surface of the mounting seat (3), the upper end of the control shaft (5) is connected to the mounting block (6), and a support plate (11) is fixed below the mounting block (6), and the lower end of the support plate (11) is fixedly connected to the mounting seat (3), the upper end of the control shaft (5) is connected to a rotation control mechanism to control the rotation of the hollow ball (4), and the inner end of the external pipe (2) is sleeved with a mounting sealing ring (12), and the sealing ring (12) is provided on the inner end of the external pipe (2). One end of the ring (12) facing the hollow ball (4) is in contact with the surface of the hollow ball (4) to provide a seal for the outside of the hollow ball (4); an elastic sealing pad (13) is fixed to the side of the sealing ring (12) facing the outer end of the external tube (2) to seal the connection between the sealing ring (12) and the external tube (2); an air pressure chamber (14) is provided at the outer end of the sealing ring (12), and the air pressure chamber (14) is annularly opened inside the external tube (2); an air pressure control mechanism is provided above the air pressure chamber (14), and the movement of the sealing ring (12) is controlled by the air pressure control mechanism; The air pressure control mechanism comprises a communication port (15), a connection cover (16), an air pressure plug (17) and a vertical drive mechanism; A communication port (15) is provided above the air pressure chamber (14); A connecting cover (16) is fixed to the outer surface of the external pipe (2), and the interior of the connecting cover (16) and the connecting port (15) are connected to each other; A gas pressure plug (17) is arranged inside the connection cover (16), and the radial outer side of the gas pressure plug (17) is arranged to fit the inner wall of the connection cover (16); A vertical driving mechanism connected to the air pressure plug (17) to control the connection of the air pressure plug (17); The vertical drive mechanism comprises a control head (18), a through slot (19), a drive plate (20), a hollow slot (21) and a manual controller; A control head (18) is fixed above the air pressure plug (17), and an up-and-down sliding structure is formed between the control head (18) and the connecting cover (16); A through groove (19) is provided above the control head (18); A driving plate (20) is arranged above the mounting seat (3), and an end of the driving plate (20) is inserted into the through groove (19), and the support plate (11) passes through the driving plate (20) to form an up and down sliding structure; A hollow groove (21) is provided in the middle of the driving plate (20), and the control shaft (5) passes through the driving plate (20) through the hollow groove (21); A manual controller connected to the driving plate (20) to control the movement of the driving plate (20); The manual controller is composed of a control rod (22), the control rod (22) penetrates the drive plate (20) and forms a threaded connection between the drive plates (20), and the control rod (22) is actively mounted above the mounting seat (3); The rotation control mechanism comprises a worm wheel (7), a worm (8) and a control hand wheel (9); A worm gear (7) is fixed above the control shaft (5), and a rotation connection is formed between the control shaft (5) and the mounting block (6); A worm (8) is arranged on the outside of the worm wheel (7) and is meshed with the worm wheel (7), and the worm (8) and the mounting block (6) are rotationally connected. A control hand wheel (9) is fixed to the outer end of the worm (8) to control the rotation of the worm (8); A rotation limiting mechanism is provided on the outer side of the worm wheel (7) to limit the rotation of the worm wheel (7) and maintain the stability of the position of the hollow ball (4).

2. A two-stage metal hard seal ball valve according to claim 1, characterized in that: A rotating shaft (501) is fixed to the lower end of the hollow ball (4), and a rotating connection is formed between the rotating shaft (501) and the valve body (1), thereby providing rotational positioning for the hollow ball (4).

3. A two-stage metal hard seal ball valve according to claim 1, characterized in that: The external pipe (2) and the valve body (1) are detachably connected, and a mounting docking plate (10) is fixed to the inner end of the external pipe (2) and the outer end of the valve body (1), and the external pipe (2) and the valve body (1) are connected via the mounting docking plate (10).

4. A two-stage metal hard seal ball valve according to claim 1, characterized in that: The rotation limiting mechanism comprises a transmission plate (23) and a limiting block (24); A transmission plate (23) is fixed above the driving plate (20), and the upper end of the transmission plate (23) is located inside the mounting block (6) and between the mounting block (6) to form an up-and-down sliding structure; The limit block (24) is arranged above the worm wheel (7), and the lower part of the limit block (24) is made of rubber material, and the limit block (24) and the upper end of the transmission plate (23) are fixedly connected.

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