A high sealing ball valve

Abstract

The present application discloses a high-sealing ball valve, and relates to the technical field of ball valves. The present application includes a valve body and a valve seat arranged thereon, wherein a ball and two seals are arranged in the valve body, a valve stem connected to the ball is rotatably arranged in the valve seat, a pressure cover is arranged on the valve seat, a sealing packing and a sealing ring are arranged in the valve seat, both of which are sleeved on the valve stem, and the sealing includes a first sealing ring and a second sealing ring that are both in contact with and overlapped with the ball, and a connecting ring, a limiting ring, a fixing ring and a guide ring are arranged in the valve seat, which are distributed sequentially from top to bottom. When the present application is in use, as the number of rotations of the valve stem increases, the deformation of the sealing packing and the sealing ring increases accordingly, and the gap compensated by the sealing packing and the sealing ring increases accordingly, so as to always maintain a fitting state with the valve stem, thereby improving the sealing performance, and at the same time, the sealing packing and the sealing ring only maintain a fitting state with the valve stem, and will not exert a large resistance force on the valve stem.

Description

Technical Field

[0001] The present application relates to the technical field of ball valves, and in particular to a high-sealing ball valve. Background Art

[0002] A ball valve is a valve in which the ball is driven by a valve stem and rotates around the axis of the ball valve. The ball valve is mainly used in pipelines to cut off, distribute and change the flow direction of the medium. In the prior art, the sealing of the valve stem is mostly achieved through sealing packing and sealing rings, and the sealing of the ball is mostly achieved through sealing rings. During use, as the number of rotations of the valve stem increases, the wear of the sealing packing and the sealing ring will gradually increase, causing the gap between the valve stem and the sealing packing and the sealing ring to increase, resulting in reduced sealing. As the number of rotations of the ball increases, the wear of the sealing ring will gradually increase, causing the gap between the ball and the sealing ring to increase, resulting in reduced sealing.

[0003] The existing open patent CN117189906A discloses a high-sealing ball valve for gas delivery, including a ball valve body, a ball body is installed inside the ball valve body, and the upper end of the ball body is connected to a valve stem, a sealing packing is installed on the upper end of the ball valve body, a sealing ring is installed on the inner wall of the ball valve body below the sealing packing, and the valve stem passes through the sealing ring, an upper annular cavity is opened on the inner wall of the upper end of the sealing ring, and a self-contracting sealing ring is placed in the upper annular cavity, the self-contracting sealing ring passes through the outside of the upper annular cavity and is in close contact with the valve stem, a plurality of elastic bags distributed at equal intervals are fixedly connected to the inner wall of the upper annular cavity, and the elastic bags and the self-contracting sealing ring are fixedly connected. It is connected to a sliding magnetic plate. This patent relies on the elastic force of a high-elastic shrink ring to allow the O-ring to automatically shrink after wear, allowing the O-ring to always maintain close contact with the valve stem, thereby effectively improving the sealing at the rotating part. In the process of the self-shrinking sealing ring wearing and shrinking, it drives the sliding magnetic plate to move, allowing the sliding magnetic plate to magnetically repel the annular magnetic plate, and then allowing the lower pressure ring to press down on the bottom sealing ring. The lower pressure ring and the bottom sealing ring together form a sealing line on the periphery of the valve stem, thereby further effectively improving the sealing, preventing gas from leaking out from the upper end rotation of the ball valve body, achieving high sealing at the rotating part of the ball valve, and adding two additional sealings on the basis of the sealing packing to effectively improve the sealing.

[0004] However, the above technology still has certain defects. Since the elastic force of the high-elastic shrink ring will cause the O-ring to exert a large resistance force on the valve stem, it will make the valve stem difficult to rotate, affecting normal use. Therefore, a high-sealing ball valve is proposed. Summary of the invention

[0005] The purpose of this application is to solve the technical problems raised in the above background technology, and this application provides a high-sealing ball valve.

[0006] In order to achieve the above-mentioned purpose, this application specifically adopts the following technical solutions:

[0007] A high sealing ball valve comprises a valve body and a valve seat which are connected to each other, wherein a ball is arranged in the valve body, a valve stem connected to the ball is arranged in the valve seat, a sealing packing and a sealing ring which are sleeved on the valve stem are arranged in the valve seat, a first sealing ring and a second sealing ring which are tightly attached to the ball are installed in the valve body, a connecting ring, a limiting ring, a fixing ring and a guiding ring which are sequentially arranged from top to bottom are arranged in the valve seat, a moving ring is slidably arranged on the connecting ring, the valve stem is linked to the moving ring through a linkage, and when the valve stem rotates, the connecting ring is moved by the linkage. The movable member drives the moving ring to slide back and forth, a sliding frame is slidingly arranged on the fixed ring, a resistance ring in contact with the sealing packing is arranged on the sliding frame, an airbag is arranged between the limit ring and the sliding frame, the moving ring is linked with the airbag through a linkage part, when the moving ring slides back and forth, air is inflated into the airbag through the linkage part, the sealing ring is arranged on the sliding frame, a driving member is arranged between the sliding frame and the guide ring, when the sliding frame slides, the sealing ring is driven to shrink by the driving member, and the second sealing ring is connected to the valve body through a tension spring.

[0008] Furthermore, a plurality of guide posts are arranged on the connecting ring, the movable ring is slidably sleeved on the plurality of guide posts, a reset spring is arranged between the movable ring and the guide posts, and when the valve stem rotates, the movable ring is driven to slide intermittently in one direction through the linkage.

[0009] Furthermore, the linkage part includes a linkage ring arranged on the valve stem, and a plurality of rollers are rotatably arranged on the linkage ring and are all rollingly overlapped with the movable ring. The movable ring is provided with a plurality of arc-shaped protrusions, and the arc-shaped protrusions are constructed with a plane and two symmetrically distributed inclined surfaces, and the rollers are rollingly overlapped with the arc-shaped protrusions.

[0010] Furthermore, the linkage part includes a fixed cylinder arranged between the connecting ring and the limiting ring, a piston rod is slidably arranged in the fixed cylinder, the free end of the piston rod is connected to the movable ring, the fixed cylinder is connected to an air inlet pipe, the air inlet pipe is connected to an air outlet pipe, both the air inlet pipe and the air outlet pipe are provided with a one-way valve and the conduction directions of the two are opposite, the free end of the air inlet pipe passes through the valve seat, and the free end of the air outlet pipe is connected to the airbag.

[0011] Furthermore, a receiving groove is constructed on the limiting ring, a blocking ring plug-fitted with the receiving groove is arranged on the sliding frame, and the airbag is arranged on the outer peripheral side of the blocking ring.

[0012] Furthermore, the driving member comprises a conical ring which is arranged on the sliding frame and located on the outer peripheral side of the sealing ring, the guide ring is configured with a conical groove, and the outer diameter of the conical ring is greater than the outer diameter of the conical groove.

[0013] Furthermore, two stepped grooves are symmetrically constructed in the valve body, the first sealing ring and the second sealing ring are both arranged in the stepped grooves, a plurality of recessed holes are constructed in the stepped grooves, and the tension spring is installed in the recessed holes, a first flow channel is formed between the first sealing ring and the second sealing ring, and a second flow channel is formed between the second sealing ring and the stepped groove.

[0014] Furthermore, an annular groove corresponding to the first flow channel is configured on the first sealing ring, the cross-section of the annular groove is semicircular, and a sealing gasket is provided between the second sealing ring and the stepped groove.

[0015] Furthermore, the second sealing ring is provided with an auxiliary sealing member which is in contact with and overlaps the ball.

[0016] Furthermore, the auxiliary seal comprises an annular groove formed on the second sealing ring, in which an auxiliary sealing ring is slidably arranged to overlap with the ball, and a plurality of countersunk holes are constructed in the annular groove, in which a compression spring connected to the auxiliary sealing ring is arranged.

[0017] The beneficial effects of this application are as follows:

[0018] When the present application is in use, as the number of times the valve stem rotates increases, the deformation of the sealing packing and the sealing ring increases accordingly, and the gap compensated by the sealing packing and the sealing ring increases accordingly, so as to always maintain a fit with the valve stem, thereby improving the sealing performance. At the same time, the sealing packing and the sealing ring only maintain a fit with the valve stem and do not exert a large resistance force on the valve stem, so as to avoid the situation where the valve stem is difficult to rotate and ensure normal use. When the ball rotates, a double sealing structure is formed by the first sealing ring and the second sealing ring to improve the sealing performance. When the number of rotations of the ball increases, the second sealing ring will maintain a fit with the ball to compensate for the gap between the second sealing ring and the ball, thereby improving the sealing performance, and is therefore more practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional diagram of the structure of this application;

[0020] Figure 2 It is a three-dimensional cross-sectional view of the present application;

[0021] Figure 3 This application Figure 2 The enlarged view of point A in the middle;

[0022] Figure 4 It is a three-dimensional diagram of the structure of part of this application;

[0023] Figure 5 This application Figure 4 A three-dimensional cross-sectional view of

[0024] Figure 6 This application Figure 5 The enlarged view of point B in the middle;

[0025] Figure 7 This application Figure 5 Enlarged view of point C in the middle;

[0026] Figure 8 This application Figure 5 The enlarged view of point D in the middle;

[0027] Fig. 9 This application Figure 5 Enlarged view of point E in the middle.

[0028] Figure numerals: 1, valve body; 2, valve seat; 3, ball; 4, valve stem; 5, gland; 6, sealing packing; 7, sealing ring; 8, first sealing ring; 9, second sealing ring; 10, connecting ring; 11, limiting ring; 12, fixing ring; 13, guide ring; 14, moving ring; 15, receiving groove; 16, sliding frame; 17, resistance ring; 18, airbag; 19, stepped groove; 20, concave hole; 21, tension spring; 22, first flow channel; 2 3. Second flow channel; 24. Guide column; 25. Return spring; 26. Linkage ring; 27. Roller; 28. Arc-shaped protrusion; 29. ​​Fixed cylinder; 30. Piston rod; 31. Inlet pipe; 32. Outlet pipe; 33. One-way valve; 34. Receiving groove; 35. Blocking ring; 36. Conical ring; 37. Conical groove; 38. Annular groove; 39. Sealing gasket; 40. Annular groove; 41. Auxiliary sealing ring; 42. Countersunk hole; 43. Compression spring. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

[0030] like Figure 1-Figure 9As shown, a high-sealing ball valve proposed in one embodiment of the present application includes a valve body 1 and a valve seat 2 arranged thereon, a ball 3 and two seals are arranged in the valve body 1, and the two seals are symmetrically distributed with the axis of the ball 3 as the center, a valve stem 4 connected to the ball 3 is rotatably arranged in the valve seat 2, the valve stem 4 is in a vertical direction, a pressure cover 5 is arranged on the valve seat 2, the top of the valve seat 2 is an opening, and the pressure cover 5 is arranged at the opening through a plurality of bolts, a sealing packing 6 and a sealing ring 7 both sleeved on the valve stem 4 are arranged in the valve seat 2, the sealing packing 6 and the sealing ring 7 are both in a horizontal direction and can be deformed, and the sealing member includes a first sealing ring 8 and a second sealing ring 9 both of which are in contact with and overlapped with the ball 3, The first sealing ring 8 and the second sealing ring 9 are both in a vertical direction. A connecting ring 10, a limiting ring 11, a fixing ring 12 and a guide ring 13 are arranged in the valve seat 2 in sequence from top to bottom. The connecting ring 10, the limiting ring 11, the fixing ring 12 and the guide ring 13 are all in a horizontal direction and are fixed in the valve seat 2. A moving ring 14 is slidably arranged on the connecting ring 10. The moving ring 14 is in a horizontal direction and slides in a vertical direction. The valve stem 4 is linked to the moving ring 14 through a linkage. When the valve stem 4 rotates, the moving ring 14 is driven to slide back and forth through the linkage. A receiving groove 15 is constructed on the fixing ring 12. The sealing packing 6 is arranged in the receiving groove 15. A sliding ring 14 is slidably arranged on the fixing ring 12. The movable frame 16 slides in the vertical direction. The sliding frame 16 is provided with a contact ring 17 that contacts and overlaps with the sealing packing 6. The contact ring 17 is horizontal and fixed on the sliding frame 16. The contact ring 17 is plugged and matched with the accommodating groove 15. An airbag 18 is provided between the limit ring 11 and the sliding frame 16. The airbag 18 is annular in structure. The movable ring 14 is linked with the airbag 18 through a linkage part. When the movable ring 14 slides back and forth, the airbag 18 is inflated through the linkage part. The sealing ring 7 is provided on the sliding frame 16. A driving member is provided between the sliding frame 16 and the guide ring 13. When the sliding frame 16 slides, the sealing ring 7 is driven to shrink by the driving member, and the valve body 1 is inflated. There are two stepped grooves 19 symmetrically constructed, and the stepped groove 19 is annular in structure. The first sealing ring 8 and the second sealing ring 9 are both arranged in the stepped groove 19. The first sealing ring 8 is fixed in the stepped groove 19, and the second sealing ring 9 is slidably arranged in the stepped groove 19. A plurality of concave holes 20 are constructed in the stepped groove 19, and the plurality of concave holes 20 are all horizontally oriented and distributed in an annular array. A tension spring 21 connected to the second sealing ring 9 is arranged in the concave hole 20, and the tension spring 21 is horizontally oriented and its two ends are respectively fixedly connected to the concave hole 20 and the second sealing ring 9, and a first flow channel 22 is formed between the first sealing ring 8 and the second sealing ring 9, and a second flow channel 23 is formed between the second sealing ring 9 and the stepped groove 19;

[0031] In the initial state, the sealing packing 6, the sealing ring 7 and the tension spring 21 are all in a natural state, the sealing packing 6 and the sealing ring 7 are all in contact with the valve stem 4, the moving ring 14, the sliding frame 16, the contact ring 17, the sealing ring 7 and the second sealing ring 9 are all in the initial position, the first sealing ring 8 and the second sealing ring 9 are all in contact with the ball 3, when the valve stem 4 rotates, the sealing packing 6 and the sealing ring 7 will be worn, the gap between the valve stem 4 and the sealing packing 6 and the sealing ring 7 will increase, and the moving ring 14 will be driven to slide back and forth through the linkage part, the moving ring 14 will slide downward to the limit position first, and then slide upward to the initial position, when the moving ring 14 is in the process of reciprocating sliding, the airbag 18 is inflated through the linkage part, and the airbag 18 swells and forces the sliding frame 16 to slide downward to the limit position. At the same time, the resistance ring 17 is driven to move downward and plug into the receiving groove 15, driving the sealing ring 7 to move downward to the limit position. The resistance ring 17 is in contact with the sealing packing 6 and overlaps, forcing the sealing packing 6 to deform in the receiving groove 15 and keep in contact with the valve stem 4 to compensate for the gap between the valve stem 4 and the sealing packing 6. The sealing ring 7 is driven by the driving member to deform and shrink, and the sealing ring 7 keeps in contact with the valve stem 4 to compensate for the gap between the valve stem 4 and the sealing ring 7, thereby improving the sealing performance. The sealing packing 6 and the sealing ring 7 only keep in contact with the valve stem 4, and will not exert a large resistance force on the valve stem 4, so as to avoid the valve stem 4 from being difficult to be opened. In the case of rotation, as the number of rotations of the valve stem 4 increases, the number of reciprocating slides of the moving ring 14 will increase accordingly, the air in the airbag 18 will increase accordingly, the bulging state of the airbag 18 will increase accordingly, the downward sliding distance of the sliding frame 16 will increase accordingly, the resistance force applied by the resistance ring 17 to the sealing packing 6 will increase accordingly, the deformation amount of the sealing packing 6 will increase accordingly, so as to always maintain the fitting state with the valve stem 4, the deformation amount of the sealing ring 7 will increase accordingly, so as to always maintain the fitting state of the sealing ring 7 and the valve stem 4, thereby realizing that the more the number of rotations of the valve stem 4 increases, the larger the gap compensated by the sealing packing 6 and the sealing ring 7, and when the ball 3 rotates, a double sealing structure is formed by the first sealing ring 8 and the second sealing ring 9. Improve the sealing performance. As the number of rotations of the ball 3 increases, the first sealing ring 8 and the second sealing ring 9 will be worn, and the gaps between the ball 3 and the first sealing ring 8 and the second sealing ring 9 will increase. During this process, the medium will present two states. The first state is that the medium enters the first flow channel 22 and forces the second sealing ring 9 to slide, and the tension spring 21 is stretched, forcing the second sealing ring 9 to remain in contact with the ball 3 to compensate for the gap between the second sealing ring 9 and the ball 3. The second state is that the medium enters the second flow channel 23 and forces the second sealing ring 9 to slide, and the tension spring 21 is stretched, forcing the second sealing ring 9 to remain in contact with the ball 3 to compensate for the gap between the second sealing ring 9 and the ball 3, thereby improving the sealing performance.

[0032] To sum up, when the present application is in use, as the number of rotations of the valve stem 4 increases, the deformation of the sealing packing 6 and the sealing ring 7 increases accordingly, and the gap compensated by the sealing packing 6 and the sealing ring 7 increases accordingly, so as to always maintain a fit with the valve stem 4, thereby improving the sealing performance. At the same time, the sealing packing 6 and the sealing ring 7 only maintain a fit with the valve stem 4 and do not exert a large resistance force on the valve stem 4 to avoid the situation where the valve stem 4 is difficult to rotate and ensure normal use. When the ball 3 rotates, a double sealing structure is formed by the first sealing ring 8 and the second sealing ring 9 to improve the sealing performance. When the number of rotations of the ball 3 increases, the second sealing ring 9 will maintain a fit with the ball 3 to compensate for the gap between the second sealing ring 9 and the ball 3, thereby improving the sealing performance, and is therefore more practical.

[0033] like Figure 6 As shown, in some embodiments, a plurality of guide posts 24 are provided on the connecting ring 10, the guide posts 24 are in a vertical direction and fixed on the connecting ring 10, and the plurality of guide posts 24 are distributed in a ring array, the moving ring 14 is slidably sleeved on the plurality of guide posts 24, and a reset spring 25 is provided between the moving ring 14 and the guide posts 24, the reset spring 25 is in a vertical direction and the two ends are respectively fixedly connected to the moving ring 14 and the guide posts 24, when the valve stem 4 rotates, the moving ring 14 is driven to slide intermittently in one direction through the linkage, and the intermittent one-way sliding here refers to intermittently driving the moving ring 14 to slide downward;

[0034] Referring to the above, in the initial state, the movable ring 14 is located at the initial position, and the reset spring 25 is in the natural state. When the valve stem 4 rotates, the movable ring 14 is driven to slide intermittently in one direction through the linkage. The movable ring 14 first slides downward to the extreme position, forcing the reset spring 25 to be squeezed, and then the reset spring 25 is reset to the natural state, and the movable ring 14 slides upward to the initial position, and this is repeated to drive the movable ring 14 to slide back and forth.

[0035] like Figure 4-Figure 6 As shown, in some embodiments, the linkage member includes a linkage ring 26 disposed on the valve stem 4, the linkage ring 26 is horizontal and fixed on the valve stem 4, a plurality of rollers 27 are rotatably disposed on the linkage ring 26 and are all rollingly overlapped with the moving ring 14, the plurality of rollers 27 are vertically disposed and distributed in a ring array, a plurality of arc-shaped protrusions 28 are disposed on the moving ring 14, the arc-shaped protrusions 28 are vertically disposed and fixed on the moving ring 14, the plurality of arc-shaped protrusions 28 are distributed in a ring array, a plane and two symmetrically distributed inclined surfaces are constructed on the arc-shaped protrusions 28, the inclined surfaces are connected to the moving ring 14, and the rollers 27 are rollingly overlapped with the arc-shaped protrusions 28;

[0036] Referring to the above, in the initial state, the moving ring 14 is located at the initial position, and the roller 27 rolls and overlaps with the moving ring 14. When the valve stem 4 rotates, the linkage ring 26 and the roller 27 are driven to rotate together. The roller 27 first rolls from the moving ring 14 to one of the inclined surfaces of the arc-shaped protrusion 28, and then rolls from the inclined surface to the plane. In this process, the moving ring 14 is driven to slide downward to the extreme position, and the reset spring 25 is squeezed. Thereafter, the roller 27 rolls from the plane to another inclined surface, and then rolls from the inclined surface to the moving ring 14. In this process, the reset spring 25 is reset to the natural state, and the moving ring 14 slides upward to the initial position, and this process is repeated to achieve intermittent unidirectional sliding of the moving ring 14.

[0037] like Figure 7 As shown, in some embodiments, the linkage part includes a fixed cylinder 29 arranged between the connecting ring 10 and the limiting ring 11, the fixed cylinder 29 is in a vertical direction and fixedly arranged between the connecting ring 10 and the limiting ring 11, a piston rod 30 is slidably arranged in the fixed cylinder 29, the piston rod 30 slides in the vertical direction, the free end of the piston rod 30 is connected to the moving ring 14, the free end of the piston rod 30 is fixedly connected to the moving ring 14, the fixed cylinder 29 is connected to an air inlet pipe 31, the air inlet pipe 31 is connected to an air outlet pipe 32, the air inlet pipe 31 and the air outlet pipe 32 are both provided with a one-way valve 33 and the conduction directions of the two are opposite, the free end of the air inlet pipe 31 passes through the valve seat 2, and the free end of the air outlet pipe 32 is connected to the air bag 18;

[0038] Referring to the above, in the initial state, the movable ring 14 is located at the initial position, and the piston rod 30 is also located at the initial position. When the movable ring 14 slides downward, it drives the piston rod 30 to slide downward together, and the fixed cylinder 29 presents a negative pressure state. The air enters the fixed cylinder 29 through the air inlet pipe 31. When the movable ring 14 slides upward, it drives the piston rod 30 to slide upward together, and the air in the fixed cylinder 29 enters the airbag 18 through the air outlet pipe 32 to realize inflation into the airbag 18.

[0039] like Figure 8 As shown, in some embodiments, a receiving groove 34 is configured on the limiting ring 11, the receiving groove 34 is horizontal and annular, a blocking ring 35 is provided on the sliding frame 16 and is plugged with the receiving groove 34, the airbag 18 is arranged on the outer peripheral side of the blocking ring 35, and the blocking ring 35 is horizontal and fixed on the sliding frame 16;

[0040] Referring to the above, in the initial state, the sliding frame 16 is located at the initial position, the blocking ring 35 is also located at the initial position and is partially located in the receiving groove 34. When the airbag 18 inflates and forces the sliding frame 16 to slide downward to the extreme position, it drives the blocking ring 35 to move downward together. Through the cooperation of the blocking ring 35 and the receiving groove 34, the airbag 18 is limited to avoid compressing the valve stem 4 when the airbag 18 inflates.

[0041] like Fig. 9 As shown, in some embodiments, the driving member includes a conical ring 36 disposed on the sliding frame 16 and located on the outer peripheral side of the sealing ring 7, the conical ring 36 can be deformed, the conical ring 36 is horizontal and fixed on the sliding frame 16, and a conical groove 37 is configured on the guide ring 13, the conical groove 37 is vertical, and the outer diameter of the conical ring 36 is greater than the outer diameter of the conical groove 37;

[0042] Referring to the above, in the initial state, the sliding frame 16 is located at the initial position, the sealing ring 7 and the conical ring 36 are both located at the initial position and are in a natural state. When the sliding frame 16 slides downward to the extreme position, it drives the sealing ring 7 and the conical ring 36 to move downward together. Since the outer diameter of the conical ring 36 is larger than the outer diameter of the conical groove 37, the conical ring 36 is forced to deform and squeeze the sealing ring 7, thereby forcing the sealing ring 7 to deform and shrink.

[0043] like Figure 3 As shown, in some embodiments, the first sealing ring 8 is configured with an annular groove 38 corresponding to the first flow channel 22, the annular groove 38 is in a vertical direction, and the cross-sectional structure of the annular groove 38 is semicircular;

[0044] Referring to the above, when the medium enters the first flow channel 22 and forces the second sealing ring 9 to slide, the annular groove 38 can not only buffer the impact force of the medium on the first sealing ring 8, but also guide the medium so that the medium can force the second sealing ring 9 to slide more smoothly.

[0045] like Figure 3 As shown, in some embodiments, a sealing gasket 39 is disposed between the second sealing ring 9 and the stepped groove 19, and the sealing gasket 39 is in a vertical direction and sleeved on the second sealing ring 9;

[0046] Referring to the above, when the second sealing ring 9 slides, the sealing gasket 39 is provided to ensure the sealing between the second sealing ring 9 and the stepped groove 19, thereby preventing the first flow channel 22 and the second flow channel 23 from being connected, thereby further improving the sealing.

[0047] like Figure 3 As shown, in some embodiments, the second sealing ring 9 is provided with an auxiliary sealing member that contacts and overlaps the ball 3, and the auxiliary sealing member can be elastically deformed and can slide on the second sealing ring 9 in a horizontal direction;

[0048] Referring to the above, when the ball 3 rotates, an auxiliary sealing structure is formed by the auxiliary sealing member. When the number of rotations of the ball 3 increases, the auxiliary sealing member undergoes elastic deformation and slides in the horizontal direction. The auxiliary sealing member maintains contact with the ball 3, further improving the sealing performance.

[0049] like Figure 3As shown, in some embodiments, the auxiliary seal includes an annular groove 40 opened on the second sealing ring 9, the annular groove 40 is in a vertical direction, an auxiliary sealing ring 41 that contacts and overlaps the ball 3 is slidably arranged in the annular groove 40, the auxiliary sealing ring 41 is in a vertical direction and slides in a horizontal direction, a plurality of countersunk holes 42 are constructed in the annular groove 40, the plurality of countersunk holes 42 are all in a horizontal direction and distributed in an annular array, a compression spring 43 connected to the auxiliary sealing ring 41 is arranged in the countersunk hole 42, the compression spring 43 is in a horizontal direction and its two ends are respectively fixedly connected to the countersunk hole 42 and the auxiliary sealing ring 41;

[0050] Referring to the above, in the initial state, the compression spring 43 is in a compressed state, and the auxiliary sealing ring 41 is completely located in the annular groove 40. When the ball 3 rotates, the second sealing ring 9 is separated into a double sealing structure by the auxiliary sealing ring 41, and a triple sealing structure is formed with the auxiliary sealing ring 41 to improve the sealing performance. When the number of rotations of the ball 3 increases, the auxiliary sealing ring 41 will be worn, and the compression spring 43 gradually tends to a natural state and forces the auxiliary sealing ring 41 to slide horizontally in the annular groove 40, so that the auxiliary sealing ring 41 remains in contact with the ball 3 to compensate for the gap between the auxiliary sealing ring 41 and the ball 3, thereby further improving the sealing performance.

[0051] The working principle of the present application is as follows: when the valve stem 4 rotates, the sealing packing 6 and the sealing ring 7 will be worn, and the gap between the valve stem 4 and the sealing packing 6 and the sealing ring 7 will increase, driving the linkage ring 26 and the roller 27 to rotate together. The roller 27 first rolls from the moving ring 14 to one of the inclined surfaces of the arc-shaped protrusion 28, and then rolls from the inclined surface to the plane. During this process, the moving ring 14 is driven to slide downward to the limit position, and the reset spring 25 is squeezed. Then the roller 27 rolls from the plane to another inclined surface, and then rolls from the inclined surface to the moving ring 14. During this process, the reset spring 25 is reset to the natural state, and the moving ring 14 slides upward to the initial position, and this is repeated to achieve the reciprocating sliding of the moving ring 14. When the moving ring 14 is reciprocatingly sliding, , first drive the piston rod 30 to slide downward together, the fixed cylinder 29 presents a negative pressure state, the air enters the fixed cylinder 29 from the air inlet pipe 31, and then the movable ring 14 slides upward, driving the piston rod 30 to slide upward together, the air in the fixed cylinder 29 enters the air bag 18 from the air outlet pipe 32, so as to realize the inflation into the air bag 18, the air bag 18 swells and forces the sliding frame 16 to slide downward to the limit position, at the same time, drives the resistance ring 17 to move downward and plug into the receiving groove 15, drives the sealing ring 7 and the conical ring 36 to move downward to the limit position together, the resistance ring 17 and the sealing packing 6 are in contact and overlapped, forcing the sealing packing 6 to deform in the receiving groove 15 and keep in contact with the valve stem 4 to compensate for the gap between the valve stem 4 and the sealing packing 6, due to the conical ring The outer diameter of the ring 36 is greater than the outer diameter of the conical groove 37, so the conical ring 36 is forced to deform and squeeze the sealing ring 7, thereby forcing the sealing ring 7 to deform and shrink. The sealing ring 7 remains in contact with the valve stem 4 to compensate for the gap between the valve stem 4 and the sealing ring 7, thereby improving the sealing performance. The sealing packing 6 and the sealing ring 7 only remain in contact with the valve stem 4 and do not exert a large resistance force on the valve stem 4 to avoid the situation where the valve stem 4 is difficult to rotate. As the number of rotations of the valve stem 4 increases, the number of reciprocating slides of the moving ring 14 will increase accordingly, the air in the airbag 18 will increase accordingly, the bulging state of the airbag 18 will increase accordingly, the downward sliding distance of the sliding frame 16 will increase accordingly, and the resistance force exerted by the resistance ring 17 on the sealing packing 6 will increase accordingly, and the sealing The deformation of the packing 6 increases accordingly, so as to always keep in contact with the valve stem 4. The deformation of the sealing ring 7 increases accordingly, so as to always keep in contact with the valve stem 4. The more times the valve stem 4 rotates, the larger the gap compensated by the sealing packing 6 and the sealing ring 7. When the ball 3 rotates, a double sealing structure is formed by the first sealing ring 8 and the second sealing ring 9 to improve the sealing performance. The second sealing ring 9 is separated into a double sealing structure by the auxiliary sealing ring 41, and a triple sealing structure is formed with the auxiliary sealing ring 41 to improve the sealing performance. As the number of rotations of the ball 3 increases, the first sealing ring 8, the second sealing ring 9 and the auxiliary sealing ring 41 will be worn, and the gaps between the ball 3 and the first sealing ring 8 and the second sealing ring 9 will increase.In this process, the medium will present two states. The first state is that the medium enters the first flow channel 22 and forces the second sealing ring 9 to slide. The tension spring 21 is stretched, forcing the second sealing ring 9 to remain in contact with the sphere 3 to compensate for the gap between the second sealing ring 9 and the sphere 3. The setting of the annular groove 38 can not only buffer the impact force of the medium on the first sealing ring 8, but also guide the medium so that the medium can force the second sealing ring 9 to slide more smoothly. The second state is that the medium enters the second flow channel 23 and forces the second sealing ring 9 to slide. The tension spring 21 is stretched, forcing the second sealing ring 9 to remain in contact with the sphere 3 to compensate for the gap between the second sealing ring 9 and the sphere 3. The auxiliary sealing ring 41 is kept in contact with the ball 3 to compensate for the gap between the second sealing ring 9 and the ball 3, thereby improving the sealing performance. When the second sealing ring 9 slides, the sealing gasket 39 can ensure the sealing performance between the second sealing ring 9 and the stepped groove 19, avoiding the first flow channel 22 and the second flow channel 23 from being connected, thereby further improving the sealing performance. The compression spring 43 gradually tends to a natural state and forces the auxiliary sealing ring 41 to slide horizontally in the annular groove 40, so that the auxiliary sealing ring 41 keeps in contact with the ball 3 to compensate for the gap between the auxiliary sealing ring 41 and the ball 3, thereby further improving the sealing performance.

[0052] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A high-sealing ball valve, comprising a valve body (1) and a valve seat (2) connected to each other, wherein a ball (3) is arranged in the valve body (1), a valve stem (4) connected to the ball (3) is arranged in the valve seat (2), a sealing packing (6) and a sealing ring (7) sleeved on the valve stem (4) are arranged in the valve seat (2), a first sealing ring (8) and a second sealing ring (9) tightly attached to the ball (3) are installed in the valve body (1), and the characteristics are as follows: The valve seat (2) is provided with a connecting ring (10), a limiting ring (11), a fixing ring (12) and a guide ring (13) which are sequentially arranged from top to bottom. A moving ring (14) is slidably arranged on the connecting ring (10). The valve stem (4) is linked to the moving ring (14) via a linkage. When the valve stem (4) rotates, the moving ring (14) is driven to slide back and forth via the linkage. A plurality of guide posts (24) are provided on the connecting ring (10). The moving ring (14) is slidably sleeved on the plurality of guide posts (24). A return spring (25) is arranged between the movable ring (14) and the guide column (24). When the valve stem (4) rotates, the movable ring (14) is driven to slide intermittently in one direction through a linkage member. The linkage member comprises a linkage ring (26) arranged on the valve stem (4). The linkage ring (26) is rotatably provided with a plurality of rollers (27) which are all in rolling contact with the movable ring (14). The movable ring (14) is provided with a plurality of arc-shaped protrusions (28). The arc-shaped protrusions (28) are constructed with a plane and two symmetrically distributed The inclined surface, the roller (27) and the arc-shaped protrusion (28) are rollingly overlapped, the fixed ring (12) is slidably provided with a sliding frame (16), the sliding frame (16) is provided with a resistance ring (17) in contact with the sealing filler (6), an air bag (18) is provided between the limit ring (11) and the sliding frame (16), the moving ring (14) is linked with the air bag (18) through a linkage part, when the moving ring (14) slides back and forth, the air bag (18) is inflated through the linkage part, and the sealing ring (7) is provided on the sliding frame (16), a driving member is arranged between the sliding frame (16) and the guide ring (13), and when the sliding frame (16) slides, the sealing ring (7) is driven to contract by the driving member, and the driving member includes a conical ring (36) arranged on the sliding frame (16) and located on the outer peripheral side of the sealing ring (7), and the guide ring (13) is configured with a conical groove (37), and the outer diameter of the conical ring (36) is larger than the outer diameter of the conical groove (37), and the second sealing ring (9) and the valve body (1) are connected via a tension spring (21).

2. The high sealing ball valve according to claim 1, characterized in that: The linkage portion comprises a fixed cylinder (29) arranged between the connecting ring (10) and the limiting ring (11), a piston rod (30) being slidably arranged in the fixed cylinder (29), the free end of the piston rod (30) being connected to the movable ring (14), an air inlet pipe (31) being connected to the fixed cylinder (29), an air outlet pipe (32) being connected to the air inlet pipe (31), both the air inlet pipe (31) and the air outlet pipe (32) being provided with a one-way valve (33) and the two having opposite conduction directions, the free end of the air inlet pipe (31) penetrating the valve seat (2), and the free end of the air outlet pipe (32) being connected to the air bag (18).

3. The high sealing ball valve according to claim 1, characterized in that: The limiting ring (11) is provided with a receiving groove (34), the sliding frame (16) is provided with a blocking ring (35) plug-fitting with the receiving groove (34), and the airbag (18) is provided on the outer peripheral side of the blocking ring (35).

4. The high sealing ball valve according to claim 1, characterized in that: The valve body (1) has two stepped grooves (19) symmetrically configured therein, the first sealing ring (8) and the second sealing ring (9) are both arranged in the stepped grooves (19), a plurality of recessed holes (20) are configured in the stepped grooves (19), a tension spring (21) is installed in the recessed holes (20), a first flow channel (22) is formed between the first sealing ring (8) and the second sealing ring (9), and a second flow channel (23) is formed between the second sealing ring (9) and the stepped grooves (19).

5. The high sealing ball valve according to claim 4, characterized in that: The first sealing ring (8) is provided with an annular groove (38) corresponding to the first flow channel (22); the cross-sectional structure of the annular groove (38) is semicircular; and a sealing gasket (39) is provided between the second sealing ring (9) and the stepped groove (19).

6. The high sealing ball valve according to claim 1, characterized in that: The second sealing ring (9) is provided with an auxiliary sealing member which is in contact with and overlaps the ball (3).

7. The high sealing ball valve according to claim 6, characterized in that: The auxiliary seal comprises an annular groove (40) formed on the second seal ring (9), an auxiliary seal ring (41) being slidably disposed in the annular groove (40) and being in contact with and overlapping the ball (3), a plurality of countersunk holes (42) being configured in the annular groove (40), and a compression spring (43) connected to the auxiliary seal ring (41) being disposed in the countersunk hole (42).

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