A ball valve with eccentric sealing structure

Abstract

The present invention discloses a ball valve with an eccentric sealing structure, comprising a valve body, a valve cover, a valve seat, a valve stem and a valve cavity, wherein one end of the valve stem in the valve cavity is key-connected with a sphere, the valve seat is located between the sphere and the entry end of the valve body, and one end of the valve stem away from the sphere is provided with a driving device capable of driving the valve stem to rotate circumferentially or move axially; a left fixed block and a right fixed block are provided at the upper end of the sphere, a left inclined surface is provided on the side of the left fixed block facing the right fixed block, and a right inclined surface is provided on the side of the right fixed block facing the left fixed block, the left inclined surface and the right inclined surface are parallel to each other to form a parallelogram-shaped channel between the two fixed blocks, an arc-shaped protrusion matched with the channel is fixedly connected to the valve stem, the left inclined surface can prevent the arc-shaped protrusion from moving up along the axis of the valve stem, and the right inclined surface can prevent the arc-shaped protrusion from moving down along the axis of the valve stem. The present invention has the following advantages and effects: the ball valve realizes frictionless sealing between the ball and the valve seat by utilizing an eccentric structure.

Description

Technical Field

[0001] The invention relates to a ball valve, in particular to a ball valve with an eccentric sealing structure. Background Art

[0002] A ball valve is a valve that is driven by a valve stem through an opening and closing member (ball) and rotates around the ball valve axis. As a type of ball valve, an eccentric ball valve is also widely used. It is widely used in media transmission pipelines in the fields of petroleum, chemical industry, and electric power due to its simple structure, convenient opening and closing, and low flow resistance.

[0003] However, there is still friction between the ball and the valve seat of the existing eccentric ball valve during the opening and closing process. As the number of valve openings and closings increases, the sealing surface is gradually worn, reducing the sealing performance and product service life, and thus needs to be improved. Summary of the invention

[0004] The object of the present invention is to provide a ball valve with an eccentric sealing structure, wherein the ball valve utilizes the eccentric structure to achieve frictionless sealing between the ball and the valve seat.

[0005] The above technical objectives of the present invention are achieved through the following technical solutions: a ball valve with an eccentric sealing structure, comprising a valve body, a valve cover, a valve seat and a valve stem, wherein a valve cavity connected to an inlet end and a discharge end is provided inside the valve body, a ball is keyed to one end of the valve stem in the valve cavity, the valve seat is located between the ball and the inlet end of the valve body, and a driving device capable of driving the valve stem to rotate circumferentially or move axially is provided at one end of the valve stem away from the ball;

[0006] The upper end of the sphere is provided with two independent left fixed blocks and right fixed blocks, the left fixed block is provided with a left inclined surface on the side facing the right fixed block, and the right fixed block is provided with a right inclined surface on the side facing the left fixed block, the left inclined surface and the right inclined surface are parallel to each other to form a parallelogram-shaped channel between the two fixed blocks, and an arc-shaped protrusion matching the channel is fixedly connected to the valve stem, and the two sides of the arc-shaped protrusion are respectively abutted against the left inclined surface and the right inclined surface, the left inclined surface can prevent the arc-shaped protrusion from moving up along the axial centerline of the valve stem, and the right inclined surface can prevent the arc-shaped protrusion from moving down along the axial centerline of the valve stem.

[0007] The present invention is further configured as follows: a sealing protrusion which can be in sealing contact with the valve seat is provided on one side of the sphere.

[0008] The present invention is further configured as follows: a limiting hole is provided on the lower end surface of the sphere, a fixed shaft is built into the limiting hole, one end of the fixed shaft is fixedly connected to the valve body, and a gap exists between the fixed shaft and the hole wall of the limiting hole.

[0009] The present invention is further configured as follows: the left fixing block and the right fixing block are both fixed to the upper end surface of the sphere by fasteners.

[0010] The present invention is further configured as follows: the driving device comprises a bracket located on the upper end surface of the valve cover, the bracket is provided with a transmission rod and a transmission sleeve coaxially arranged therein, the transmission sleeve is sleeved on the outside of the transmission rod and threadedly matched with the transmission rod, one end of the transmission sleeve is detachably connected to the valve stem, and a driving member capable of driving the transmission rod to rotate is provided on the top of the bracket;

[0011] An L-shaped groove is provided on the outer surface of the transmission sleeve, and a bolt that can be engaged with the L-shaped groove is passed through one side of the bracket. The L-shaped groove includes a first groove arranged along the axial direction of the transmission sleeve, and a second groove arranged along the circumference of the transmission sleeve. The end of the first groove facing the valve body is connected to the second groove; when the valve is in a closed state, one end of the bolt is engaged with the end of the first groove away from the second groove.

[0012] The present invention is further configured as follows: the second groove is a 1 / 4 outer circumferential annular groove opened along the circumference of the transmission sleeve.

[0013] The present invention is further configured as follows: a driving tooth is provided on one side of the transmission rod, and a fixed step is integrally provided on the upper end surface of the transmission sleeve; when the transmission rod rotates 180 degrees to drive the transmission sleeve to lift, one side of the driving tooth abuts against the fixed step.

[0014] The present invention is further configured as follows: a first arc-shaped groove is provided on one side of the transmission rod, a through groove matching the first arc-shaped groove is provided on one side of the transmission sleeve, a guide sleeve is provided on the inner wall of the bracket, and a second arc-shaped groove is provided on the side of the guide sleeve facing the transmission sleeve; when one end of the bolt is engaged with the second groove, the first arc-shaped groove is flush with the through groove, and is connected with the second arc-shaped groove through the through groove, a guide roller is built in the through groove for limiting the transmission sleeve, and one side of the guide roller can be matched with the first arc-shaped groove or the second arc-shaped groove;

[0015] When the ball valve is in a closed state, the guide roller matches the through groove and the second arc-shaped groove; when the ball valve is in an open state, the guide roller matches the through groove and the first arc-shaped groove.

[0016] The present invention is further configured as follows: a transmission nut is provided between the transmission rod and the transmission sleeve, one side of the transmission nut is fixedly connected to the transmission sleeve, and the other side of the transmission nut is threadedly connected to the transmission rod.

[0017] The present invention is further configured as follows: a clearance groove for the valve stem to be embedded in is provided at one end of the transmission sleeve facing the valve stem, a same cross pin is passed through between one end of the valve stem in the clearance groove and the transmission sleeve, and retaining rings are provided at both ends of the cross pin for positioning the cross pin.

[0018] In summary, the present invention has the following beneficial effects: the eccentric ball valve described in the present application can realize frictionless sealing between the ball and the valve seat. By adopting a specific driving device, the valve stem can not only be driven to rotate circumferentially, but also to move axially. One end of the valve stem is connected to the ball through a key, so that the valve stem can still drive the ball to rotate during the axial movement. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the ball valve of the first embodiment;

[0020] Figure 2 yes Figure 1 A local enlarged schematic diagram in FIG.

[0021] Figure 3 yes Figure 1 A schematic diagram of the structure of the middle drive device;

[0022] Figure 4 yes Figure 3 A schematic diagram of the structure of the middle transmission sleeve in a lifting state;

[0023] Figure 5 yes Figure 4 A schematic diagram of the structure of the transmission sleeve in the state of rotating 90 degrees;

[0024] Figure 6 yes Figure 5 Schematic diagram of the structure of the transmission rod and the transmission sleeve.

[0025] 1. Valve body; 2. Valve cover; 3. Valve seat; 4. Valve stem; 5. Inlet end; 6. Discharge end; 7. Ball; 8. Driving device; 9. Left fixed block; 10. Right fixed block; 11. Left inclined surface; 12. Right inclined surface; 13. Arc-shaped protrusion; 14. Sealing protrusion; 15. Limiting hole; 16. Fixed shaft; 17. Bracket; 18. Transmission rod; 19. Transmission sleeve; 20. Driving member; 21. L-shaped groove; 22. Bolt; 23. First groove; 24. Second groove; 25. Driving tooth; 26. Fixed step; 27. First arc-shaped groove; 28. Through groove; 29. ​​Guide sleeve; 30. Second arc-shaped groove; 31. Guide roller; 32. Transmission nut; 33. Make way groove; 34. Cross pin; 35. Retaining ring. DETAILED DESCRIPTION

[0026] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0027] like Figure 1-Figure 6 As shown, a ball valve with an eccentric sealing structure includes a valve body 1, a valve cover 2, a valve seat 3 and a valve stem 4. A valve cavity connected to an inlet end 5 and a discharge end 6 is provided inside the valve body 1. A ball 7 is keyed to one end of the valve stem 4 in the valve cavity. The valve seat 3 is located between the ball 7 and the inlet end 5 of the valve body 1. A driving device 8 that can drive the valve stem 4 to rotate circumferentially or move axially is provided at the end of the valve stem 4 away from the ball 7.

[0028] The upper end of the sphere 7 is provided with two independent left fixed blocks 9 and right fixed blocks 10. The left fixed block 9 is provided with a left inclined surface 11 on the side facing the right fixed block 10, and the right fixed block 10 is provided with a right inclined surface 12 on the side facing the left fixed block 9. The left inclined surface 11 and the right inclined surface 12 are parallel to each other to form a parallelogram-shaped channel between the two fixed blocks. An arc-shaped protrusion 13 matching the channel is fixedly connected to the valve stem 4, and the two sides of the arc-shaped protrusion 13 are respectively abutted against the left inclined surface 11 and the right inclined surface 12. The left inclined surface 11 can prevent the arc-shaped protrusion 13 from moving up along the axis of the valve stem 4, and the right inclined surface 12 can prevent the arc-shaped protrusion 13 from moving down along the axis of the valve stem 4.

[0029] The eccentric ball valve described in the present application can achieve a frictionless seal between the ball 7 and the valve seat 3. First of all, it should be noted that the driving device 8 of the present application can not only drive the valve stem 4 to rotate circumferentially, but also drive the valve stem 4 to move axially. One end of the valve stem 4 is connected to the ball 7 by a key, so that the valve stem 4 can still drive the ball 7 to rotate during the axial movement. The specific operation of the ball valve described in the present application is as follows:

[0030] like Figure 1 and Figure 2 As shown, the ball valve is in a closed flow channel state, so that the inlet end 5 and the outlet end 6 of the valve body 1 are cut off by the ball 7, and at this time, the ball 7 is sealed against the valve seat 3. If the flow channel needs to be opened, the ball 7 needs to be rotated to connect the inlet end 5 with the outlet end 6. In the present application, the valve stem 4 needs to be driven upward by the driving device 8 first, so that the arc-shaped protrusion 13 on the valve stem 4 moves upward synchronously. Since the left inclined surface 11 will hinder the arc-shaped protrusion 13 from moving upward, the arc-shaped protrusion 13 will apply force to the left inclined surface 11. After the force decomposition, the thrust received by the left inclined surface 11 can be decomposed into a component force in the direction away from the valve seat 3 and a vertically upward component force. Among them, the component force in the direction away from the valve seat 3 can drive the left fixed block 9 and the ball 7 to move in the direction away from the valve seat 3, while the vertically upward component force is blocked by the valve cover 2 at the upper end of the left fixed block 9, resulting in the overall not continuing to move upward, thereby ensuring that the ball 7 will not be separated from the valve cavity.

[0031] It can be seen that the valve seat 3 and the ball 7 are separated from the sealing fit through the above movement, so that there is a gap between the two, resulting in part of the medium being discharged from the inlet end 5 to the outlet end 6 through the gap. However, in actual operation, the gap is very small, and it is only for the ball 7 and the valve seat 3 to be separated from the sealing abutment state, so as to facilitate the subsequent rotation process of the ball 7 without friction. Therefore, the displacement of the ball 7 in the direction away from the valve seat 3 is very small, so that the valve stem 4 and the ball 7 are connected by a key without being separated. Finally, the valve stem 4 is driven by the driving device 8 to rotate, so as to rotate the ball 7 and realize the opening of the flow channel. The movement of the ball 7 to cut off the flow channel is opposite to the above, and will not be described in detail here.

[0032] Furthermore, a sealing protrusion 14 is provided on one side of the ball 7 and can be in sealing contact with the valve seat 3. The sealing protrusion 14 is made of a metal material, and a hard seal between the ball 7 and the valve seat 3 can be achieved through the sealing protrusion 14.

[0033] Furthermore, a limit hole 15 is provided on the lower end surface of the ball 7, and a fixed shaft 16 is built into the limit hole 15, and one end of the fixed shaft 16 is fixedly connected to the valve body 1. There is a gap between the fixed shaft 16 and the hole wall of the limit hole 15, so that the ball 7 can move slightly.

[0034] Furthermore, the left fixing block 9 and the right fixing block 10 are both fixed to the upper end surface of the sphere 7 by fasteners.

[0035] Furthermore, the driving device 8 includes a bracket 17 located on the upper end surface of the valve cover 2, and the bracket 17 has a transmission rod 18 and a transmission sleeve 19 coaxially arranged therein, the transmission sleeve 19 is sleeved on the outside of the transmission rod 18 and threadedly matched with the transmission rod 18, and one end of the transmission sleeve 19 is detachably connected to the valve stem 4. A driving member 20 that can drive the transmission rod 18 to rotate is arranged on the top of the bracket 17.

[0036] An L-shaped groove 21 is provided on the outer surface of the transmission sleeve 19, and a bolt 22 that can be engaged with the L-shaped groove 21 is penetrated on one side of the bracket 17. The L-shaped groove 21 includes a first groove 23 arranged along the axial direction of the transmission sleeve 19, and a second groove 24 arranged along the circumferential direction of the transmission sleeve 19. One end of the first groove 23 facing the valve body 1 is connected to the second groove 24. When in the valve closing state, one end of the bolt 22 is engaged with the end of the first groove 23 away from the second groove 24.

[0037] To change the ball valve of the present application from a closed state to an open state, the valve stem 4 needs to be lifted first to drive the ball 7 to move away from the valve seat 3, and then rotated to achieve frictionless opening and closing. The specific operation is as follows:

[0038] like Figure 3-Figure 5As shown, when the valve is in the closed state, one end of the bolt 22 is engaged with the end of the first groove 23 away from the second groove 24, that is, one end of the bolt 22 is in Figure 6 At this time, the driving member 20 drives the transmission rod 18 to rotate. Since the transmission rod 18 and the transmission sleeve 19 are threadedly matched, the transmission sleeve 19 can be driven to rotate synchronously. However, since one end of the bolt 22 is in Figure 6 The position of ① in the middle makes both ends of the bolt 22 contact with the groove wall of the first groove 23, thereby limiting the rotation of the transmission sleeve 19, so that the transmission sleeve 19 can only move along its axial direction. In this application, the transmission sleeve 19 will first perform a lifting movement, so that the transmission sleeve 19 and the bolt 22 move relative to each other, causing the bolt 22 to be in a state of Figure 6 The position of ① in the middle is transformed into Figure 6 At this time, the ball 7 can be driven to move away from the valve seat 3, so that there is a gap between the ball 7 and the valve seat 3.

[0039] Next, if the driving member 20 continues to drive the transmission rod 18 to rotate, at this time, one end of the bolt 22 does not abut against the groove wall of the first groove 23, so that the transmission sleeve 19 can rotate synchronously with the transmission rod 18, resulting in the bolt 22 being in the Figure 6 The position of ② in the middle is transformed into Figure 6 As the transmission sleeve 19 rotates, the valve stem 4 is synchronously driven to rotate, thereby completing the rotation process of the ball 7, so that the ball 7 can open the flow channel without friction.

[0040] Furthermore, the second groove 24 is a 1 / 4 outer peripheral annular groove opened along the circumference of the transmission sleeve 19. By limiting the opening of the second groove 24 to 1 / 4 outer peripheral annular groove of the transmission sleeve 19, the rotation of the transmission sleeve 19 is limited to 90 degrees. When the transmission sleeve 19 rotates 90 degrees, the valve stem 4 can drive the ball 7 to rotate 90 degrees synchronously to complete the opening and closing of the flow channel by the ball 7, thereby completing the valve closing or valve opening action.

[0041] Furthermore, a driving tooth 25 is provided on one side of the transmission rod 18, and a fixed step 26 is integrally provided on the upper end surface of the transmission sleeve 19. When the transmission rod 18 rotates 180 degrees to drive the transmission sleeve 19 to lift, one side of the driving tooth 25 abuts against the fixed step 26.

[0042] First, the present application clearly states that the displacement of the ball 7 moving away from the valve seat 3 is small, so that the ball 7 can be opened and closed without friction with the valve seat 3. Therefore, in the present application, the transmission rod 18 is limited to rotate 180 degrees, so that the bolt 22 can be moved from the position in the valve seat 3 to the position in the valve seat 3. Figure 6 The position of ① in the middle is transformed into Figure 6At this time, one side of the driving tooth 25 is in contact with the fixed step 26. If the transmission rod 18 is continuously rotated to drive the transmission sleeve 19 to rotate synchronously, one side of the driving tooth 25 will exert a synchronous rotation force on the fixed step 26 to facilitate the rotation of the transmission sleeve 19, so that the bolt 22 is moved from the fixed step 26 to the fixed step 26. Figure 6 The position of ② in the middle is transformed into Figure 6 The position of ③ in the middle.

[0043] It is particularly noted that: due to the medium pressure on the ball 7 at the moment of opening and closing the ball 7 in the valve cavity, the ball 7 is difficult to rotate under the medium pressure. Therefore, in order to overcome this resistance, in the process of driving the transmission sleeve 19 to rotate 90 degrees, the present application not only has the friction resistance of the threaded fit between the transmission rod 18 and the transmission sleeve 19, but also has the force applied by the driving teeth 25 to the fixed step 26. Under the action of the above two external forces, it is ensured that the circumferential rotation of the transmission sleeve 19 is stable and has a strong external force, thereby improving the stability of the system during long-term use.

[0044] In the present application, the rotation range of the rotating rod is 270 degrees, that is, the rotation of 180 degrees drives the transmission sleeve 19 and the valve stem 4 to move axially, and the other 90 degrees of rotation drives the transmission sleeve 19, the valve stem 4 and the ball 7 to rotate 90 degrees to open and close the flow channel. Through a small rotation range, the flow channel between the ball 7 and the valve seat 3 can be opened and closed without wear.

[0045] Furthermore, a first arc-shaped groove 27 is provided on one side of the transmission rod 18, a through groove 28 matching the first arc-shaped groove 27 is provided on one side of the transmission sleeve 19, a guide sleeve 29 is provided on the inner wall of the bracket 17, and a second arc-shaped groove 30 is provided on the side of the guide sleeve 29 facing the transmission sleeve 19. When one end of the bolt 22 is engaged with the second groove 24, the first arc-shaped groove 27 is flush with the through groove 28, and is connected with the second arc-shaped groove 30 through the through groove 28. A guide roller 31 is built into the through groove 28 for limiting the transmission sleeve 19, and one side of the guide roller 31 can be matched with the first arc-shaped groove 27 or the second arc-shaped groove 30.

[0046] When the ball valve is in the closed state (channel closed state), the guide roller cooperates with the through groove 28 and the second arc-shaped groove 30; when the ball valve is in the open state (channel open state), the guide roller 31 cooperates with the through groove 28 and the first arc-shaped groove 27.

[0047] Because the transmission sleeve 19 of the present application not only needs to bear its own weight and the weight of the connected valve stem 4. Since the valve stem 4 is not only a moving part and a force-bearing part during the opening and closing of the valve, but also a sealing part, it is also impacted and corroded by the medium, and also produces friction with the packing. Therefore, copper alloys, carbon steel, stainless steel, etc. are often used when selecting the material of the valve stem 4, and these materials will increase the weight of the valve stem 4 itself. In the above technical solution, the valve stem 4 and the transmission sleeve 19 are only threadedly connected to the transmission rod 18 to support the weight of the transmission sleeve 19 and the valve stem 4 through threaded matching. In the long-term use process, there will be hidden dangers in use, and the threaded matching area of ​​the transmission sleeve 19 and the transmission rod 18 will affect the support of its weight.

[0048] In the present application, the above problem is solved by the guide roller 31. The specific operation is as follows: when the ball valve is in the closed state, the guide roller 31 is located at the matching position of the through groove 28 and the second arc groove 30. At this time, the guide sleeve 29 supports the guide roller 31, and then the guide roller 31 supports the transmission sleeve 19, so that the weight of the transmission sleeve 19 and the valve stem 4 is shared, and the stability of the system operation is improved.

[0049] When the valve opening operation is required, the valve stem 4 must be axially lifted first, and then the valve stem 4 must be rotated. At this time, after the valve stem 4 and the transmission sleeve 19 are lifted circumferentially, the bolt 22 can be moved from the position in the Figure 6 The position of ① in the middle is transformed into Figure 6 At this time, the through groove 28 is flush with the second arc groove 30. If the transmission rod 18 is continuously rotated to drive the transmission sleeve 19 to rotate synchronously, the transmission sleeve 19 and the guide sleeve 29 will rotate relative to each other. The second arc groove 30 on the guide sleeve 29 that cooperates with the guide roller 31 has a guiding function, so that the guide roller 31 is separated from the second arc groove 30 as the transmission sleeve 19 rotates, and then the guide roller 31 moves to between the through groove 28 and the first arc groove 27. After rotating 90 degrees, the ball 7 is fully opened, and the bolt 22 is in the Figure 6 The position of ② in the middle is transformed into Figure 6 At this time, the guide roller 31 realizes the fixing between the transmission sleeve 19 and the transmission rod 18.

[0050] The above process is a complete valve opening process, while the valve closing process is opposite to the above movement process, which will not be described in detail here.

[0051] Furthermore, the guide sleeve 29 and the bracket 17 are fixed by fasteners.

[0052] Furthermore, a transmission nut 32 is provided between the transmission rod 18 and the transmission sleeve 19 , one side of the transmission nut 32 is fixedly connected to the transmission sleeve 19 , and the other side of the transmission nut 32 is threadedly connected to the transmission rod 18 .

[0053] Furthermore, the transmission sleeve 19 is provided with a clearance groove 33 for the valve stem 4 to be inserted into at one end thereof facing the valve stem 4, and a same transverse pin 34 is provided between one end of the valve stem 4 in the clearance groove 33 and the transmission sleeve 19, and both ends of the transverse pin 34 are provided with retaining rings 35 for positioning the transverse pin 34. The retaining ring 35 and the transverse pin 34 can be connected by threaded connection or other detachable connection. By providing the transverse pin 34, the valve stem 4 and the transmission sleeve 19 can be detachably connected.

[0054] The specific embodiments are merely explanations of the present invention and are not limitations of the present invention. After reading this specification, those skilled in the art may make modifications to the embodiments without any creative contribution as needed. However, such modifications are protected by the patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A ball valve with an eccentric sealing structure, comprising a valve body (1), a valve cover (2), a valve seat (3) and a valve stem (4), wherein a valve cavity connected to an inlet end (5) and a discharge end (6) is arranged inside the valve body (1), characterized in that: The valve stem (4) is keyed to a ball (7) at one end in the valve cavity, the valve seat (3) is located between the ball (7) and the inlet end (5) of the valve body (1), and a driving device (8) capable of driving the valve stem (4) to rotate circumferentially or move axially is provided at one end of the valve stem (4) away from the ball (7); The upper end of the sphere (7) is provided with two independent left fixed blocks (9) and right fixed blocks (10); the left fixed block (9) is provided with a left inclined surface (11) on the side facing the right fixed block (10); the right fixed block (10) is provided with a right inclined surface (12) on the side facing the left fixed block (9); the left inclined surface (11) and the right inclined surface (12) are parallel to each other so as to form a parallelogram-shaped channel between the two fixed blocks; an arc-shaped protrusion (13) matching the channel is fixedly connected to the valve stem (4); the two sides of the arc-shaped protrusion (13) are respectively in contact with the left inclined surface (11) and the right inclined surface (12); the left inclined surface (11) can prevent the arc-shaped protrusion (13) from moving up along the axis of the valve stem (4); and the right inclined surface (12) can prevent the arc-shaped protrusion (13) from moving down along the axis of the valve stem (4); A sealing protrusion (14) capable of sealingly abutting against the valve seat (3) is provided on one side of the ball (7); The left fixing block (9) and the right fixing block (10) are both fixed to the upper end surface of the sphere (7) by fasteners; The driving device (8) comprises a bracket (17) located on the upper end surface of the valve cover (2), the bracket (17) having a transmission rod (18) and a transmission sleeve (19) coaxially arranged therein, the transmission sleeve (19) being sleeved on the outside of the transmission rod (18) and threadedly matched with the transmission rod (18), one end of the transmission sleeve (19) being detachably connected to the valve stem (4), and a driving member (20) capable of driving the transmission rod (18) to rotate being arranged on the top of the bracket (17); The outer surface of the transmission sleeve (19) is provided with an L-shaped groove (21), and a bolt (22) that can be engaged with the L-shaped groove (21) is passed through one side of the bracket (17), and the L-shaped groove (21) includes a first groove (23) arranged along the axial direction of the transmission sleeve (19), and a second groove (24) arranged along the circumference of the transmission sleeve (19), and the end of the first groove (23) facing the valve body (1) is connected to the second groove (24); when the valve is in a closed state, one end of the bolt (22) is engaged with the end of the first groove (23) away from the second groove (24); A driving tooth (25) is provided on one side of the transmission rod (18), and a fixed step (26) is integrally provided on the upper end surface of the transmission sleeve (19); when the transmission rod (18) rotates 180 degrees to drive the transmission sleeve (19) to be lifted, one side of the driving tooth (25) abuts against the fixed step (26); A first arc-shaped groove (27) is provided on one side of the transmission rod (18); a through groove (28) matching with the first arc-shaped groove (27) is provided through one side of the transmission sleeve (19); a guide sleeve (29) is provided on the inner wall of the bracket (17); a second arc-shaped groove (30) is provided on the side of the guide sleeve (29) facing the transmission sleeve (19); when one end of the bolt (22) is engaged with the second groove (24), the first arc-shaped groove (27) is flush with the through groove (28) and is connected with the second arc-shaped groove (30) through the through groove (28); a guide roller (31) is built in the through groove (28) for limiting the transmission sleeve (19); one side of the guide roller (31) can be matched with the first arc-shaped groove (27) or the second arc-shaped groove (30); When the ball valve is in a closed state, the guide roller (31) cooperates with the through groove (28) and the second arc-shaped groove (30); when the ball valve is in an open state, the guide roller (31) cooperates with the through groove (28) and the first arc-shaped groove (27).

2. The ball valve with an eccentric sealing structure according to claim 1, characterized in that: A limiting hole (15) is provided on the lower end surface of the sphere (7), a fixed shaft (16) is built into the limiting hole (15), one end of the fixed shaft (16) is fixedly connected to the valve body (1), and a gap exists between the fixed shaft (16) and the hole wall of the limiting hole (15).

3. The ball valve with an eccentric sealing structure according to claim 1, characterized in that: The second groove (24) is a 1 / 4 outer circumferential annular groove opened along the circumference of the transmission sleeve (19).

4. The ball valve with an eccentric sealing structure according to claim 1, characterized in that: A transmission nut (32) is provided between the transmission rod (18) and the transmission sleeve (19); one side of the transmission nut (32) is fixedly connected to the transmission sleeve (19), and the other side of the transmission nut (32) is threadedly connected to the transmission rod (18).

5. The ball valve with an eccentric sealing structure according to claim 4, characterized in that: The transmission sleeve (19) is provided with a clearance groove (33) for the valve stem (4) to be inserted into at one end thereof facing the valve stem (4), and a same transverse pin (34) is passed through between one end of the valve stem (4) in the clearance groove (33) and the transmission sleeve (19), and retaining rings (35) for positioning the transverse pin (34) are provided at both ends of the transverse pin (34).

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