High-pressure-resistant all-welded ball valve and sealing structure

Abstract

The invention discloses a high-pressure-resistant all-welded ball valve and a sealing structure, relates to the field of ball valves, and solves the problem that when an existing high-pressure-resistant all-welded ball valve and an existing sealing structure are used, a communicating hole in a ball body is frequently rubbed with the surface of the sealing structure in the rotating process, and the sealing performance is affected. Comprising a valve body, a control mechanism, a sealing mechanism and a driving mechanism, the control mechanism comprises a control ball, a communication hole is formed in the control ball, and the sealing mechanism comprises a sealing ring and a sealing ring. According to the ball valve, the sealing rings on the two sides are preferentially controlled to be away from the control ball through the sealing mechanism, the situation that the sealing rings and the inner walls of the sealing rings are scratched and abraded in the rotating process of the communicating hole to affect the sealing performance can be avoided, meanwhile, the sealing degree between the sealing rings and the outer wall of the control ball can be improved in the valve closing process, and operation is convenient, fast and efficient.

Description

Technical Field

[0001] The invention relates to the technical field of ball valves, in particular to a high-pressure resistant fully welded ball valve and a sealing structure. Background Art

[0002] The ball valve can open or cut off the flow of the medium. It includes a ball and a valve stem. The spherical surface of the ball is provided with a number of channels for the medium to flow through. By rotating the valve stem, the ball can be driven to rotate, thereby opening and closing the channels, opening or cutting off the flow of the medium. In order to prevent the medium from leaking on the spherical surface of the ball, a sealing mechanism needs to be set in the ball valve to seal the gap between the outer wall of the ball and the valve body.

[0003] In order to improve the sealing performance of existing ball valves, the sealing rings at the input pipe and output pipe are generally directly fitted tightly to the outer wall of the ball. However, since a channel is opened on the side of the ball, there will be a certain degree of annular edges at the edge of the channel. During the process of the ball rotating and opening, the edges at both ends of the channel will constantly rub against the inner wall of the sealing ring. After long-term use, the contact position between the sealing ring and the ball will be severely worn, thereby affecting the sealing effect. Summary of the invention

[0004] The object of the present invention is to provide a high-pressure resistant fully welded ball valve and sealing structure that can avoid wear on the sealing rubber during the rotation of the ball and the connecting hole and improve the sealing performance, so as to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a sealing structure, comprising a valve body, a control mechanism, a sealing mechanism and a driving mechanism, wherein a spherical groove is provided in the valve body, the control mechanism comprises a control ball rollingly connected to the inner wall of the spherical groove, a connecting hole is provided in the control ball, and is used to control the flow state of the fluid inside the valve body by adjusting the direction of the connecting hole, the sealing mechanism comprises two groups of sealing rings installed inside the valve body, the two groups of sealing rings are symmetrically distributed on both sides of the control ball, a sealing ring is fixedly connected to the valve body, the inner wall of the sealing ring is slidingly fitted with the outer wall of the control ball, and is used to preferentially control the sealing rings on both sides to be away from the control ball when adjusting the position of the connecting hole, so as to avoid the end face of the sealing ring being worn during the rotation of the connecting hole, the driving mechanism is installed on the valve body, and is used to rotate and adjust the control ball while linking the sealing mechanism to operate, so as to avoid the wear of the sealing rubber during the rotation of the ball and the connecting hole, thereby improving the sealing performance.

[0006] Preferably, the control mechanism also includes an input pipe and an output pipe fixedly mounted on the valve body, the input pipe and the output pipe are symmetrically distributed on both sides of the control ball, one end of the input pipe and the output pipe are slidably fitted with the outer wall of the control ball, and the connecting hole can connect the input pipe and the output pipe, so that the flow state of the fluid inside the valve body can be controlled by adjusting the direction of the connecting hole.

[0007] Preferably, the sealing mechanism also includes a rotating shaft fixedly mounted on the control ball, the rotating shaft passes through the sealing ring and is rotatably connected to the sealing ring, two groups of annular grooves are opened inside the valve body, the two groups of annular grooves are symmetrically distributed on both sides of the rotating shaft, and are respectively fitted with the outer walls of both ends of the sealing ring, and a sliding member for adjusting the sealing rings on both sides to slide in the opposite direction synchronously is provided in the valve body, and a sealing member for utilizing the hydraulic pressure in the input pipe to enhance the sealing between the sealing ring and the outer wall of the control ball is provided in the valve body, so as to facilitate the priority control of the sealing rings on both sides to stay away from the control ball when adjusting the position of the connecting hole, so as to avoid wear of the end faces of the sealing rings during the rotation of the connecting hole.

[0008] Preferably, the sliding member includes a sliding ring fixedly mounted on a side of the sealing ring away from the control ball, the outer walls of the input pipe and the output pipe are respectively provided with sliding grooves slidably connected to the sliding ring and the inner wall of the sealing ring, the sliding ring is fixedly connected to a driving block, and the valve body is provided with two groups of guide grooves slidably connected to the outer wall of the driving block, and the driving mechanism is used to drive the rotating shaft to rotate while adjusting the position of the driving block, so as to facilitate the adjustment of the sealing rings on both sides to slide synchronously in the opposite direction.

[0009] Preferably, the driving mechanism includes a first bevel gear coaxially fixedly installed on the upper end of the rotating shaft, a device groove is provided in the valve body, two groups of second bevel gears meshing with the first bevel gear are rotatably connected in the device groove, a driving rod is coaxially fixedly connected to the second bevel gear, the two groups of driving rods respectively penetrate the driving blocks on both sides and are movably sleeved with the inner walls of the driving blocks, a threaded groove is provided on the driving rod that is threadedly connected to the driving block, and a driving member for driving the first bevel gear to rotate and capable of limiting and stopping at any time is provided on the valve body, so as to facilitate the operation of the sealing mechanism while adjusting the rotation of the control ball.

[0010] Preferably, the driving member includes a first worm gear coaxially fixedly mounted on the first bevel gear, a device box is fixedly connected to the upper side of the valve body, a connecting shaft and a first gear are rotatably connected in the device box, a first worm gear meshing with the first worm gear is coaxially fixedly connected to the connecting shaft, a second worm gear is coaxially fixedly connected to the first gear, a second worm gear meshing with the second worm gear is coaxially fixedly connected to the connecting shaft, a rotating member for driving the first gear to rotate is provided in the device box, which is convenient for driving the first bevel gear to rotate and being able to stop at a limit position at any time.

[0011] Preferably, the rotating member includes a driving shaft rotatably connected to the device box, a second gear meshing with the first gear being coaxially fixedly connected to the driving shaft, a knob being coaxially fixedly connected to the top end of the driving shaft, and a bottom end of the driving shaft being coaxially rotatably connected to the upper side of the first worm gear to facilitate driving the first gear to rotate.

[0012] Preferably, the sealing member comprises a connecting pipe installed inside the valve body, the connecting pipe being used to connect the annular grooves on both sides, and a delivery pipe connected to one end of the connecting pipe is provided on the side of the input pipe, so as to facilitate utilizing the hydraulic pressure in the input pipe to enhance the sealing between the sealing ring and the outer wall of the control ball.

[0013] Preferably, the ends of the input pipe and the output pipe away from the control ball are fixedly connected with threaded pipes respectively, and the inner wall of the end of the threaded pipe close to the control ball is fixedly connected with a sealing gasket, so as to facilitate the connection and sealing of the input pipe and the output pipe with the external pipeline.

[0014] A high-pressure resistant fully welded ball valve comprises the sealing structure described in any one of the above items.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The invention provides a high-pressure resistant fully welded ball valve and sealing structure, which solves the problem that the connecting hole on the ball body frequently rubs against the surface of the sealing structure during rotation when the existing high-pressure resistant fully welded ball valve and sealing structure are used, thereby affecting the sealing performance. The direction of the connecting hole is adjusted by a control mechanism to control the flow state of the fluid inside the valve body. When adjusting the position of the connecting hole, the sealing rings on both sides are preferentially controlled to be away from the control ball through the sealing mechanism to avoid wear of the end faces of the sealing rings during rotation of the connecting hole. The ball valve can prevent the connecting hole from causing scratches and wear on the inner walls of the sealing ring and the sealing ring during rotation, affecting the sealing performance, and can also improve the sealing degree between the sealing ring and the outer wall of the control ball during closing the valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 This is a cross-sectional view of the valve body structure of the present invention; Figure 3 for Figure 2 A magnified image of area A; Figure 4 It is a schematic diagram of the internal structure of the present invention; Figure 5 for Figure 4 Enlarged view of area B; Figure 6 It is a schematic diagram of the local structure of the driving mechanism of the present invention; Figure 7 for Figure 6 Enlarged view of area C in the middle; Figure 8 It is a schematic diagram of the partial structure of the sealing mechanism of the present invention; Fig. 9 It is a partial structural cross-sectional view of the valve in the closed state of the present invention.

[0017] In the figure: 1, valve body; 2, spherical groove; 3, control ball; 4, connecting hole; 5, sealing ring; 6, sealing ring; 7, input pipe; 8, output pipe; 9, rotating shaft; 10, annular groove; 12, sliding ring; 13, sliding groove; 14, driving block; 15, guide groove; 16, first bevel gear; 17, device groove; 18, second bevel gear; 19, driving rod; 20, threaded groove; 22, first worm gear; 23, device box; 24, connecting shaft; 25, first gear; 26, first worm; 27, second worm; 28, second worm gear; 29, driving shaft; 30, second gear; 31, knob; 32, connecting pipe; 33, delivery pipe; 34, threaded pipe; 35, sealing pad. DETAILED DESCRIPTION

[0018] 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.

[0019] Embodiment 1

[0020] See also Figure 1-Figure 9, a high-pressure resistant fully welded ball valve and sealing structure shown in the figure, including a valve body 1, a control mechanism, a sealing mechanism and a driving mechanism, a spherical groove 2 is opened in the valve body 1, the control mechanism includes a control ball 3 rollingly connected to the inner wall of the spherical groove 2, a connecting hole 4 is opened in the control ball 3, which is used to control the flow state of the fluid inside the valve body 1 by adjusting the direction of the connecting hole 4, the sealing mechanism includes two groups of sealing rings 5 ​​installed in the valve body 1, the two groups of sealing rings 5 ​​are symmetrically distributed on both sides of the control ball 3, a sealing ring 6 is fixedly connected in the valve body 1, the inner wall of the sealing ring 6 is slidably fitted with the outer wall of the control ball 3, and is used to preferentially control the sealing rings 5 ​​on both sides to stay away from the control ball 3 when adjusting the position of the connecting hole 4, so as to avoid the end face of the sealing ring 5 from being worn during the rotation of the connecting hole 4, and the driving mechanism is installed on the valve body 1, and is used to operate the sealing mechanism while adjusting the rotation of the control ball 3.

[0021] The control mechanism also includes an input pipe 7 and an output pipe 8 fixedly mounted on the valve body 1. The input pipe 7 and the output pipe 8 are symmetrically distributed on both sides of the control ball 3. One end of the input pipe 7 and the output pipe 8 are slidably fitted with the outer wall of the control ball 3. The connecting hole 4 can connect the input pipe 7 and the output pipe 8. The ends of the input pipe 7 and the output pipe 8 away from the control ball 3 are respectively fixedly connected with threaded pipes 34, and the inner wall of the end of the threaded pipe 34 close to the control ball 3 is fixedly connected with a sealing gasket 35.

[0022] The sealing mechanism also includes a rotating shaft 9 fixedly mounted on the control ball 3, the rotating shaft 9 passes through the sealing ring 6 and is rotatably connected to the sealing ring 6, two groups of annular grooves 10 are opened inside the valve body 1, the two groups of annular grooves 10 are symmetrically distributed on both sides of the rotating shaft 9, and are respectively fitted with the outer walls of the two ends of the sealing ring 6, and a sliding member for adjusting the synchronous reverse sliding of the sealing rings 5 ​​on both sides is provided in the valve body 1, and a sealing member for utilizing the hydraulic pressure in the input pipe 7 to improve the sealing between the sealing ring 6 and the outer wall of the control ball 3 is provided in the valve body 1, and the sealing member includes a connecting pipe 32 installed inside the valve body 1, and the connecting pipe 32 is used to connect the annular grooves 10 on both sides, and a delivery pipe 33 connected to one end of the connecting pipe 32 is opened on the side of the input pipe 7.

[0023] The sliding part includes a sliding ring 12 fixedly installed on the side of the sealing ring 5 away from the control ball 3. The outer walls of the input pipe 7 and the output pipe 8 are respectively provided with sliding grooves 13 that are slidably connected to the sliding ring 12 and the inner wall of the sealing ring 5. A driving block 14 is fixedly connected to the sliding ring 12. Two groups of guide grooves 15 that are slidably connected to the outer wall of the driving block 14 are provided inside the valve body 1. The driving mechanism is used to drive the rotating shaft 9 to rotate while adjusting the position of the driving block 14.

[0024] The driving mechanism includes a first bevel gear 16 coaxially fixedly installed on the upper end of the rotating shaft 9, a device groove 17 is provided in the valve body 1, and two groups of second bevel gears 18 meshing with the first bevel gear 16 are rotatably connected in the device groove 17, and a driving rod 19 is coaxially fixedly connected to the second bevel gear 18. The two groups of driving rods 19 respectively penetrate the driving blocks 14 on both sides and are movably sleeved with the inner walls of the driving blocks 14. A threaded groove 20 threadedly connected to the driving block 14 is provided on the driving rod 19. The valve body 1 is provided with a driving member for driving the first bevel gear 16 to rotate and capable of limiting and stopping at any time.

[0025] In the present embodiment, in the process of the driving member driving the first bevel gear 16 to rotate, the first bevel gear 16 drives the second bevel gears 18 on both sides to rotate, thereby causing the driving rod 19 to rotate, and the driving blocks 14 on both sides to slide synchronously in the opposite direction through the threaded groove 20. When the valve is opened, the first bevel gear 16 drives the rotating shaft 9 to rotate the control ball 3, and the connecting hole 4 rotates toward the position where the input pipe 7 is connected to the output pipe 8. At this time, the driving block 14 drives the sliding rings 12 on both sides to slide together with the sealing ring 5 to the side away from the control ball 3, thereby reducing the resistance between the end face of the sealing ring 5 and the outer wall of the control ball 3, thereby avoiding continuous wear of the end face of the sealing ring 5 during the rotation of the connecting hole 4.

[0026] It is worth noting that: during the rotation of the connecting hole 4, the end faces of the input tube 7 and the output tube 8 always slide in contact with the outer wall of the control ball 3, but since the input tube 7 and the output tube 8 are both made of rigid materials and their positions are relatively fixed, they will not be continuously worn against the connecting hole 4 during subsequent use. The sealing ring 5 is generally made of rubber material and needs to be tightly squeezed against the outer wall of the control ball 3 to ensure the sealing. Therefore, the existing sealing ring 5 often protrudes into the inside of the rotating connecting hole 4 during use, causing continuous wear and affecting the sealing in the subsequent high-pressure use state.

[0027] When the connecting hole 4 is not completely rotated to the same axial position as the input pipe 7 and the output pipe 8, the pressure on the input pipe 7 side is greater than the pressure on the output pipe 8 side. At this time, a part of the fluid medium inside the input pipe 7 is transported to the connecting pipe 32 through the delivery pipe 33 to pressurize the annular groove 10, so that the two ends of the sealing ring 6 are pushed to the outer wall of the control ball 3, and the pressure between the control ball 3 and the outer wall is increased, thereby increasing the sealing performance and preventing the medium on the input pipe 7 side from overflowing to the output pipe 8 side through the area between the control ball 3 and the spherical groove 2 when the sealing ring 5 and the outer wall of the control ball 3 are released from the conflicting state.

[0028] Embodiment 2

[0029] See also Figure 2-Figure 8, this embodiment further illustrates the first embodiment, the driving member shown in the figure includes a first worm gear 22 coaxially fixedly mounted on the first bevel gear 16, a device box 23 is fixedly connected to the upper side of the valve body 1, a connecting shaft 24 and a first gear 25 are rotatably connected in the device box 23, a first worm 26 meshing with the first worm gear 22 is coaxially fixedly connected to the connecting shaft 24, a second worm 27 is coaxially fixedly connected to the first gear 25, a second worm gear 28 meshing with the second worm 27 is coaxially fixedly connected to the connecting shaft 24, and a rotating member for driving the first gear 25 to rotate is provided in the device box 23.

[0030] The rotating member includes a driving shaft 29 rotatably connected to the device box 23, a second gear 30 meshing with the first gear 25 is coaxially fixedly connected to the driving shaft 29, a knob 31 is coaxially fixedly connected to the top of the driving shaft 29, and the bottom end of the driving shaft 29 is coaxially rotatably connected to the upper side of the first worm gear 22.

[0031] In this embodiment, by rotating the knob 31 to drive the drive shaft 29 to rotate, the second gear 30 can drive the first gear 25 to rotate, the first gear 25 drives the second worm 27 to rotate, the second worm 27 drives the second worm wheel 28 to rotate the connecting shaft 24, the connecting shaft 24 drives the first worm 26 to rotate the first worm wheel 22, and the first bevel gear 16 can be driven to rotate by the first worm wheel 22. The design of the worm driving the worm wheel can slow down the adjustment speed when the control ball 3 is rotated, thereby improving the accuracy of the flow rate adjustment process, and can realize automatic limiting. Since the worm wheel is difficult to drive the worm to rotate, the worm can be automatically limited after loosening the knob 31, thereby avoiding the subsequent deflection of the control ball 3 under the impact of the fluid in the connecting hole 4, thereby affecting the stability of the flow rate.

[0032] It should be noted that: through the transmission design of two sets of worm wheels and worms, the position of the knob 31 can be located directly above the valve body 1, the appearance structure is more stable and symmetrical, and the rotation operation is also more convenient.

[0033] Embodiment 3

[0034] See also Figure 1-Figure 9 This embodiment further illustrates the first embodiment. The high-pressure resistant fully welded ball valve shown in the figure includes the sealing structure described in any one of the above items.

[0035] In this embodiment, the ball valve can ensure that during the rotation of the control ball 3, the two end positions of the connecting hole 4 will not contact the sealing ring 5 and the sealing ring 6, thereby avoiding the situation that the inner walls of the sealing ring 5 and the sealing ring 6 are severely worn by the two end positions of the connecting hole 4 during the frequent opening and closing process. At the same time, when the valve is opened, since most of the fluid in the input pipe 7 will be output to the output pipe 8 through the connecting hole 4, the fluid pressure is weakened at this time, and a preliminary seal can be achieved only through the sealing ring 6 in the middle position, thereby avoiding a large amount of fluid from flowing to the side of the output pipe 8 through the outer wall of the control ball 3. When the valve needs to be completely closed, the control ball 3 will be rotated to the set position, that is, after the connecting hole 4 deviates from the sealing ring 5, the sealing ring 5 will be controlled to contact the outer wall of the control ball 3, thereby achieving the purpose of improving the sealing performance. At this time, the connecting hole 4 will be limited at a position close to the sealing ring 6, thereby avoiding the connecting hole 4 from scratching and wearing the inner walls of the sealing ring 5 and the sealing ring 6 during the rotation process, affecting the sealing performance.

[0036] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0037] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. Sealing structure, characterized in that: include: A valve body (1), wherein a spherical groove (2) is formed in the valve body (1); Also includes: a control mechanism, the control mechanism comprising a control ball (3) rollingly connected to the inner wall of the spherical groove (2), a connecting hole (4) being provided in the control ball (3) for controlling the flow state of the fluid inside the valve body (1) by adjusting the direction of the connecting hole (4); A sealing mechanism, the sealing mechanism comprising two groups of sealing rings (5) installed inside the valve body (1), the two groups of sealing rings (5) being symmetrically distributed on both sides of the control ball (3), a sealing ring (6) being fixedly connected inside the valve body (1), the inner wall of the sealing ring (6) being slidably fitted with the outer wall of the control ball (3), and being used for preferentially controlling the sealing rings (5) on both sides to be away from the control ball (3) when adjusting the position of the connecting hole (4), so as to avoid abrasion of the end faces of the sealing rings (5) during the rotation of the connecting hole (4); A driving mechanism is mounted on the valve body (1) and is used to adjust the rotation of the control ball (3) and simultaneously link the sealing mechanism to operate.

2. The sealing structure according to claim 1, characterized in that: The control mechanism further comprises an input pipe (7) and an output pipe (8) fixedly mounted on the valve body (1); the input pipe (7) and the output pipe (8) are symmetrically distributed on both sides of the control ball (3); one end of the input pipe (7) and the output pipe (8) are slidably fitted with the outer wall of the control ball (3); and the connecting hole (4) is capable of connecting the input pipe (7) and the output pipe (8).

3. The sealing structure according to claim 2, characterized in that: The sealing mechanism further comprises a rotating shaft (9) fixedly mounted on the control ball (3), the rotating shaft (9) passing through the sealing ring (6) and being rotatably connected to the sealing ring (6), two groups of annular grooves (10) are provided inside the valve body (1), the two groups of annular grooves (10) are symmetrically distributed on both sides of the rotating shaft (9), and are respectively in contact with the outer walls of both ends of the sealing ring (6), a sliding member for adjusting the synchronous reverse sliding of the sealing rings (5) on both sides is provided inside the valve body (1), and a sealing member for improving the sealing performance between the sealing ring (6) and the outer wall of the control ball (3) by utilizing the hydraulic pressure in the input pipe (7) is provided inside the valve body (1).

4. The sealing structure according to claim 3, characterized in that: The sliding member comprises a sliding ring (12) fixedly mounted on a side of the sealing ring (5) away from the control ball (3); the outer walls of the input pipe (7) and the output pipe (8) are respectively provided with sliding grooves (13) slidably connected to the sliding ring (12) and the inner wall of the sealing ring (5); a driving block (14) is fixedly connected to the sliding ring (12); two groups of guide grooves (15) slidably connected to the outer wall of the driving block (14) are provided inside the valve body (1); and the driving mechanism is used to drive the rotating shaft (9) to rotate while adjusting the position of the driving block (14).

5. The sealing structure according to claim 4, characterized in that: The driving mechanism comprises a first bevel gear (16) coaxially fixedly mounted on the upper end of the rotating shaft (9); a device groove (17) is provided in the valve body (1); two groups of second bevel gears (18) meshing with the first bevel gear (16) are rotatably connected in the device groove (17); a driving rod (19) is coaxially fixedly connected to the second bevel gear (18); the two groups of driving rods (19) respectively penetrate the driving blocks (14) on both sides and are movably sleeved with the inner wall of the driving block (14); a thread groove (20) is provided on the driving rod (19) and is threadably connected to the driving block (14); and a driving member for driving the first bevel gear (16) to rotate and capable of being stopped at any time is provided on the valve body (1).

6. The sealing structure according to claim 5, characterized in that: The driving member comprises a first worm gear (22) coaxially fixedly mounted on the first bevel gear (16); a device box (23) is fixedly connected to the upper side of the valve body (1); a connecting shaft (24) and a first gear (25) are rotatably connected inside the device box (23); a first worm (26) meshing with the first worm gear (22) is coaxially fixedly connected to the connecting shaft (24); a second worm (27) is coaxially fixedly connected to the first gear (25); a second worm gear (28) meshing with the second worm gear (27) is coaxially fixedly connected to the connecting shaft (24); a rotating member for driving the first gear (25) to rotate is provided inside the device box (23).

7. The sealing structure according to claim 6, characterized in that: The rotating member comprises a driving shaft (29) rotatably connected to the device box (23); a second gear (30) meshing with the first gear (25) is coaxially fixedly connected to the driving shaft (29); a knob (31) is coaxially fixedly connected to the top end of the driving shaft (29); and a bottom end of the driving shaft (29) is coaxially rotatably connected to the upper side of the first worm gear (22).

8. The sealing structure according to claim 3, characterized in that: The sealing member comprises a connecting pipe (32) installed inside the valve body (1), the connecting pipe (32) being used to connect the annular grooves (10) at both sides, and a delivery pipe (33) connected to one end of the connecting pipe (32) is provided on a side surface of the input pipe (7).

9. The sealing structure according to claim 2, characterized in that: The ends of the input tube (7) and the output tube (8) away from the control ball (3) are respectively fixedly connected to a threaded tube (34), and the inner wall of the end of the threaded tube (34) close to the control ball (3) is fixedly connected to a sealing gasket (35).

10. High pressure resistant fully welded ball valve, characterized in that: Comprising a sealing structure as described in any one of claims 1-9.

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