Nine eccentric hard sealing ball valve

Abstract

A nine eccentric hard sealing ball valve, including a valve body and a valve core, the inlet end flow channel center line and the outlet end flow channel center line are provided with an offset distance from the valve core transverse center line, the inlet end and the outlet end of the valve body are staggered, and the ball center of the spherical sealing surface of the first and second sealing rings of the valve core is also provided with an offset from the valve body rotation center F. The offset matches the above offset distance, so that the spherical sealing surface and the conical sealing surface can realize sealing when the valve core rotates to the closed state of the ball valve, and the spherical sealing surface of the sealing ring and the conical sealing surface of the valve body can be instantaneously separated or closed when the valve core rotates, which can greatly reduce wear and tear and improve service life.

Description

Technical Field

[0001] This invention belongs to the technical field of hard-seal ball valves, and specifically relates to a nine-eccentric hard-seal ball valve. Background Technology

[0002] In existing ball valves (excluding hemispherical valves), the valve core (ball) rotates 90° during opening and closing, and the sealing surfaces of the valve core and valve body are always in close contact. Therefore, the friction stroke between the sealing surfaces is 90°. During this process, wear always occurs between the sealing surfaces, so the service life of metal hard seals is generally relatively short. Existing technologies include triple eccentric ball valves and quadruple eccentric ball valves. However, triple eccentric ball valves only have one sealing surface, i.e., unidirectional sealing; while quadruple eccentric ball valves have a spring between the ball and the valve seat, and the valve seat can move axially to prevent excessive compression of the sealing surface, but this also causes the ball and valve seat to not separate quickly, resulting in a longer friction stroke. In addition, the spring is easily jammed and fails by solid particles in the medium. Summary of the Invention

[0003] To achieve the above objectives, the present invention first proposes a nine-eccentric hard-seal ball valve with a friction stroke of only 1 to 2°, which further reduces wear between sealing surfaces and improves the service life of the sealing surfaces.

[0004] This invention relates to a nine-eccentric hard-seal ball valve, comprising a valve body and a valve core. The valve core is installed within the valve body. Rotating the valve core 90 degrees counterclockwise opens the ball valve, and rotating it 90 degrees clockwise closes the ball valve. The vertical, horizontal, and longitudinal centerlines of the valve body and valve core form the coordinate axes of a rectangular coordinate system. The valve body has an inlet end and an outlet end. The valve core has a flow channel in its center. When the ball valve is open, the inlet end of the valve body is connected to the outlet end of the valve body through the flow channel. The axial centerlines of the inlet and outlet ends of the valve body are respectively the centerlines of the inlet and outlet flow channels. The line PN connecting the center points of the two ends of the flow channel is defined as the centerline of the flow channel.

[0005] The origin of the spatial rectangular coordinate system is the rotation center F of the valve core, and the vertical center line of the valve body and valve core is the rotation axis of the valve core. On the outer surface of the valve core, on both sides of the flow channel center line of the valve core, a first sealing ring and a second sealing ring are symmetrically fixed with the rotation center F of the valve core as the center. A spherical sealing surface is provided on the outer surface of the first sealing ring and the second sealing ring. A conical sealing surface corresponding to the spherical sealing surface is provided on the inlet end and outlet end of the valve body. In the closed state of the ball valve, the spherical sealing surface and the conical sealing surface form a spherical-conical sealing pair. Let the center of the spherical sealing surface of the first sealing ring be C, and the center of the spherical sealing surface of the second sealing ring be A.

[0006] The transverse centerline of the valve body and valve core, the longitudinal centerline of the valve body and valve core, the centerline of the valve core flow channel, the centerline of the inlet flow channel, and the centerline of the outlet flow channel are all on the same plane. Assuming the above plane is a plane of rotation, the ball center C and ball center A are offset relative to the rotation center F of the valve core in both the longitudinal and transverse directions on the plane of rotation.

[0007] The center lines of the inlet flow channel and the outlet flow channel are set on both sides of the transverse center line of the valve body and valve core, and are parallel to the transverse center line of the valve body and valve core. The center line of the inlet flow channel is offset by a distance E5 from the transverse center line of the valve body and valve core, and the center line of the outlet flow channel is offset by a distance E6 from the transverse center line of the valve body and valve core.

[0008] When the ball valve is closed, the center line of the valve core flow channel and the longitudinal center line of the valve body and valve core are at an angle β; the center of the valve body inlet end facing the valve core end face is L, the center of the valve body outlet end facing the valve core end face is M, the line connecting L and M is the center line of the valve body flow channel, and the center line of the valve body flow channel and the transverse center line of the valve body and valve core are at an angle α.

[0009] Using the above structure, firstly, the spherical sealing surfaces on the first and second sealing rings of the valve core, together with the conical sealing surface of the valve body, form a spherical-conical sealing pair, achieving the sealing of the ball valve. Moreover, this seal is a line seal, thereby reducing wear on the sealing surfaces during the opening and closing of the ball valve. Secondly, because there is an offset distance between the center lines of the inlet and outlet flow channels and the transverse center lines of the valve body and valve core, the inlet and outlet ends of the valve body are staggered. The center C of the spherical sealing surface of the first sealing ring and the center A of the spherical sealing surface of the second sealing ring are also offset from the valve body's rotation center F. This offset is related to the aforementioned offset distance. The matching ensures that the spherical sealing surface and the conical sealing surface can seal when the valve core rotates to the closed state of the ball valve. At the same time, the flow channel centerline of the valve core is also deflected at an angle to the rotation center of the valve core, so that when the valve is open, the flow channel of the valve core is exactly between the inlet end and the outlet end. With the cooperation of the above structures, on the one hand, the integrity of the main function of the ball valve is guaranteed, and on the other hand, by setting the eccentricity, the spherical sealing surface of the sealing ring and the conical sealing surface of the valve body can be separated or closed instantly when the valve core rotates. Its friction stroke is only 1 to 2 degrees, which can significantly reduce the wear between the sealing surfaces and greatly improve the service life of the sealing surfaces.

[0010] In this embodiment, the two end faces of the valve core along the flow channel direction are spherical arc-shaped. The center of the sphere at the valve core inlet end is B, and the radius is SR2. The center of the sphere at the valve core outlet end is D, and the radius is SR4. The radius of the first sealing ring-shaped sealing surface is SR3, and the radius of the second sealing ring-shaped sealing surface is SR1. Let the vertical centerline, the horizontal centerline, and the longitudinal centerline of the valve body and valve core be the Z-axis, X-axis, and Z-axis of the spatial rectangular coordinate system, respectively. With the Y-axis as the coordinates, let the coordinates of F be (0, 0, 0), the coordinates of the center C of the spherical sealing surface of the first sealing ring be (-E3, -E4, 0), the coordinates of the center A of the spherical sealing surface of the second sealing ring be (E2, E1, 0), the coordinates of the center B of the end face of the valve core inlet be (-E3, E1, 0), and the coordinates of the center D of the end face of the valve core outlet be (E2, -E4, 0). Let E1 = E2 = E3 = E4 = E5 = E6 = 1~5 mm. By setting the above parameters, the manufacturing process is simplified, facilitating the processing and assembly of the entire device.

[0011] In this embodiment, SR1=SR3, SR2=SR4, and SR2≤(SR1-2E1). By setting these parameters, it is ensured that the valve core will not interfere with the valve body when it rotates.

[0012] In this embodiment, α=β=arctanE1 / (SR1-E1). When the ball valve is open, PN and LM coincide, that is, α=β. At this time, the center line of the valve core flow channel coincides with the center line of the valve body flow channel, ensuring that the resistance is minimized when the fluid enters the valve core flow channel from the valve body inlet end and flows out from the valve body outlet end.

[0013] In this embodiment, the vertex of the conical sealing surface at the valve body inlet is G, and the vertex of the conical sealing surface at the valve body outlet is H. Point G is located on the center line of the inlet flow channel, and the offset distance from point G to the longitudinal center line of the valve body core is E7. Point H is located on the center line of the outlet flow channel, and the offset distance from point H to the longitudinal center line of the valve body core is E8, where E7 = E8. By setting these parameters, the manufacturing process is simplified, facilitating the processing and assembly of the entire device. The above eight eccentricities E1, E2, E3, E4, E5, E6, E7, and E8, along with one eccentric angle β, are collectively referred to as nine eccentricities.

[0014] In this embodiment, the valve core has a first mounting post and a second mounting post on its two outer sides, respectively. The outer end faces of the first and second mounting posts are parallel connecting surfaces, and the connecting surfaces are parallel to the vertical center line of the valve body and valve core. One side of the first and second sealing rings is a spherical sealing surface, and the other side is provided with slots that match the first and second mounting posts, respectively. The first and second sealing rings are respectively mounted on the first and second mounting posts through the slots. On the connecting surface of the first and second mounting posts, a plurality of perpendicular surfaces are symmetrically arranged with the midpoint of the connecting surface as the center. The valve has screw holes, and the first and second sealing rings have countersunk through holes that match the position of the screw holes. Pull screws are installed in the countersunk through holes of the first and second sealing rings. Threaded through holes are also provided on the first and second sealing rings between adjacent countersunk through holes. Multiple threaded through holes are arranged symmetrically at the center, and thrust screws are threaded into the threaded through holes. The first and second sealing rings are fixed to the first and second mounting posts respectively by pull screws. When the valve is in the closed state, the distance between the first and second sealing rings and the conical sealing surface of the valve body is adjusted by the pull screws and thrust screws.

[0015] The above structure allows adjustment of the distance between the first and second sealing rings and the conical sealing surface of the valve body, thereby overcoming the problem of poor sealing effect caused by the machining precision of the workpiece. It ensures that there is no gap between the spherical sealing surface and the conical sealing surface, and that they are tightly sealed. In specific adjustment, first loosen the tension screws and turn them all the same number of turns. Then tighten the push screws. By pressing the push screws against the connecting surface, the first and second sealing rings are brought into close contact with the conical sealing surface of the valve body, thereby adjusting the position of the spherical sealing surface on the first and second sealing rings. Finally, tighten the tension screws to fix the first and second sealing rings.

[0016] In this embodiment, the spherical sealing surface of the valve core and the conical sealing surface of the valve body are made of stainless wear-resistant alloy materials with different hardness. Using two metal friction surfaces of different hardness effectively avoids rapid wear and adhesion, commonly known as "seizing," that can occur when two metals of the same hardness rub against each other, thus preventing motion failure.

[0017] In this embodiment, the valve body includes a middle valve body, an outlet valve body, and an inlet valve body. The middle valve body is cylindrical. The outlet valve body and the inlet valve body are fixed at both ends of the middle valve body to form the inlet and outlet ends of the valve body. The valve core is installed in the inner cavity of the middle valve body. An upper valve stem and a lower valve stem are movably installed at the upper and lower ends of the middle valve body, respectively. The central axes of the upper and lower valve stems coincide with the vertical center line of the valve core. The valve core is supported in the middle valve body by the upper and lower valve stems and is driven to rotate by the upper valve stem.

[0018] In this embodiment, the outlet valve body and the inlet valve body are flange-type valve bodies or welded valve bodies.

[0019] Compared with the prior art, the present invention has the following significant advantages:

[0020] 1. Because the center of the spherical sealing surface of the valve core is offset from the center of rotation of the valve core in both directions, the spherical sealing surface and the conical sealing surface of the valve body can be separated or closed instantly when the valve core rotates. Its friction stroke is only 1 to 2 degrees, which can greatly reduce the wear between the sealing surfaces and improve the service life of the sealing surfaces.

[0021] 2. The sealing ring is fixed to the eccentric cylindrical surface of the valve core by a thrust screw and a pull screw. By adjusting the thrust screw and the pull screw, the position of the sealing ring on the valve core can be finely adjusted along the transverse center line of the valve body and valve core, thereby eliminating machining and assembly errors and ensuring that the spherical sealing surface of the valve core is in close contact with the conical sealing surface of the valve body.

[0022] In summary, when the valve of the present invention is opened or closed, the valve core sealing surface and the valve body sealing surface can be separated or closed instantly, and its friction stroke is only 1 to 2 degrees, which can greatly reduce the wear between the sealing surfaces and improve the service life of the sealing surfaces. Attached Figure Description

[0023] Figure 1 This is a front elevation sectional view of the ball valve of the present invention in the closed state;

[0024] Figure 2 This is a frontal sectional view of the ball valve of the present invention in the open state;

[0025] Figure 3 This is a horizontal sectional view of the ball valve of the present invention in the closed state;

[0026] Figure 4 This is a horizontal sectional view of the ball valve of the present invention in the open state;

[0027] Figure 5 This is a horizontal sectional view of the ball valve of the present invention in a semi-open state;

[0028] Figure 6 This is a distribution diagram of the tension screws and thrust screws on the first and second sealing rings of the present invention.

[0029] In the diagram: 1. Vertical centerline of valve body and valve core; 2. Upper valve stem; 3. Middle valve body; 4. Valve body bolt; 5. Valve body sealing ring; 6. Outlet valve body; 7. Valve core flow channel; 8. Second mounting post; 9. Pull screw; 10. Second sealing ring; 11. Thrust screw; 12. Mounting post sealing ring; 13. Spherical sealing surface; 14. Conical sealing surface; 15. Lower valve stem; 16. Lower valve stem sealing ring; 17. Lower shaft hole; 18. Lower bearing; 19. First mounting post; 20. Transverse centerline of valve body and valve core; 21. First sealing ring; 22. Inlet valve body; 23. Valve core; 24. Upper shaft hole; 25. Upper bearing; 26. Upper valve stem sealing ring; 27. Longitudinal centerline of valve body and valve core; 28. Centerline of valve body flow channel; 29. ​​Centerline of valve core flow channel; 30. Centerline of inlet flow channel; 31. Centerline of outlet flow channel. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0031] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0032] like Figures 1 to 6 As shown, the present invention provides a nine-eccentric hard-seal ball valve, including a valve body and a valve core 23. The valve core 23 is installed in the valve body. The valve core 23 rotates 90 degrees counterclockwise to open the valve and rotates 90 degrees clockwise to close the valve. Let the vertical center line 1 of the valve body and valve core, the horizontal center line 20 of the valve body and valve core, and the longitudinal center line 27 of the valve body and valve core be the coordinate axes of the Z, X, and Y directions of the spatial rectangular coordinate system, respectively. During assembly, the vertical center line of the valve core coincides with the vertical center line of the valve body to form the vertical center line 1 of the valve body and valve core, the horizontal center line of the valve core coincides with the horizontal center line of the valve body to form the horizontal center line 20 of the valve body and valve core, and the longitudinal center line of the valve core coincides with the longitudinal center line of the valve body to form the longitudinal center line 27 of the valve body and valve core.

[0033] The valve body includes a middle valve body 3, an outlet valve body 6, and an inlet valve body 22. The middle valve body 3 is cylindrical. The outlet valve body 6 and the inlet valve body 22 are installed and fixed at both ends of the middle valve body 3 to form the inlet and outlet ends of the valve body. The outlet valve body 6 and the inlet valve body 22 are flange-type valve bodies or welded valve bodies. The flange-type valve body is connected to the middle valve body 3 as a whole by valve body bolts 4. A valve body sealing ring 5 is provided between the middle valve body 3 and the flange-type valve body for sealing. The welded valve body is welded to the middle valve body 3 as a whole. Both the flange-type valve body and the welded valve body are provided with an assembly stop to ensure that they are concentric with the middle valve body.

[0034] The valve core 23 is installed in the inner cavity of the middle valve body 3. The upper and lower ends of the middle valve body 3 are respectively provided with an upper shaft hole 24 and a lower shaft hole 17. The upper valve stem 2 is installed in the upper shaft hole 24 through an upper bearing 25. The inner wall of the upper shaft hole 24 is provided with an upper valve stem sealing ring 26 to achieve a sealed connection between the inner wall of the upper shaft hole 24 and the outer wall of the upper valve stem 2. One end of the upper valve stem 2 is fixedly connected to the valve core 23, and the other end is set outside the valve body for connection with the driving component that drives the upper valve stem 2 to rotate. The lower valve stem 15 is coaxially installed in the lower shaft hole 17. The bottom of the lower valve stem 15 is fixed to the middle valve body 3 by bolts, and the outer wall of the lower valve stem 15 is sealed to the inner wall of the lower shaft hole 17 through the lower valve stem sealing ring 16. The bottom of the valve core 23 is equipped with a lower bearing 18, and the upper end of the lower valve stem 15 is inserted into the inner hole of the lower bearing 18. The central axis of the upper valve stem 2 and the lower valve stem 15 coincides with the vertical center line 1 of the valve body and valve core. The valve core 23 is supported in the middle valve body 3 by the upper valve stem 2 and the lower valve stem 15, and the valve core 23 is driven to rotate by the upper valve stem 2.

[0035] A first sealing ring 21 and a second sealing ring 10 are fixed on the outer surface of the valve core 23 and on both sides of the valve core flow channel centerline 29. A spherical sealing surface 13 is provided on the outer surface of the first sealing ring 21 and the second sealing ring 10. A conical sealing surface 14 corresponding to the spherical sealing surface 13 is provided on both the inlet end and the outlet end of the valve body. When the ball valve is closed, the spherical sealing surface 13 and the conical sealing surface 14 of the valve body form a spherical-conical sealing pair to achieve a sealed connection between the first sealing ring 21 and the inlet end of the valve body, and between the second sealing ring 10 and the outlet end of the valve body.

[0036] The valve core 23 has a first mounting post 19 and a second mounting post 8 on its two outer sides. In this embodiment, the first mounting post 19 and the second mounting post 8 are integrally formed with the valve core 23. The outer end faces of the first mounting post 19 and the second mounting post 8 are parallel connecting surfaces, and the connecting surfaces are parallel to the vertical center line 1 of the valve body and valve core. One side of the first and second sealing rings are spherical sealing surfaces, and the other side is provided with slots that match the first mounting post 19 and the second mounting post 8. The first sealing ring 21 and the second sealing ring 10 are respectively installed on the first mounting post 19 and the second mounting post 8 through the slots. The inner wall of the first sealing ring 21 and the outer wall of the first mounting post 19, and the inner wall of the second sealing ring 10 and the outer wall of the second mounting post 8 are slidably sealed and connected by the mounting post sealing ring 12.

[0037] On the connecting surfaces of the first mounting post 19 and the second mounting post 8, a plurality of screw holes perpendicular to the connecting surfaces are symmetrically arranged with the midpoint of the connecting surfaces as the center. The first and second sealing rings are provided with countersunk through holes that match the positions of the screw holes. Pull screws 9 are installed in the countersunk through holes of the first and second sealing rings. Threaded through holes are also provided on the first and second sealing rings between adjacent countersunk through holes. The plurality of threaded through holes are symmetrically arranged in the center. Thrust screws 11 are threadedly connected in the threaded through holes.

[0038] The first sealing ring 21 and the second sealing ring 10 are respectively fixed to the first mounting post 19 and the second mounting post 8 by tension screws 9. The purpose of the thrust screw 11 is to press against the connecting surface, thereby making the first sealing ring and the second sealing ring closer to or further away from the connecting surface. This adjusts the distance between the spherical sealing surface 13 on the first sealing ring 21 and the second sealing ring 10 and the conical sealing surface 14 of the valve body, ensuring a tight connection between the spherical sealing surface 13 and the conical sealing surface 14 and improving the sealing effect. Moreover, the thrust screws 11 and the tension screws 9 are evenly spaced and symmetrically arranged around the center of the connecting surface. Their number and size are determined according to the size of the sealing ring. In this embodiment, four thrust screws 11 and four tension screws 9 are arranged. The specific adjustment method is as follows:

[0039] During adjustment, first loosen the tension screws 9, turn all the tension screws 9 the same number of turns, and then tighten the thrust screws 11. The thrust screws 11 press against the connecting surface, thereby adjusting the position of the spherical sealing surface 13 on the first sealing ring 21 and the second sealing ring 10. This ensures that there is no gap between the spherical sealing surface 13 and the conical sealing surface 14, and that they are tightly sealed, thus overcoming the problem of poor sealing effect caused by the workpiece's machining precision.

[0040] The spherical sealing surface 13 of the valve core 23 and the conical sealing surface 14 of the valve body are made of stainless wear-resistant alloy materials with different hardness. This can effectively prevent the friction surfaces from easily wearing and sticking when two metals with the same hardness rub against each other, which is commonly known as "engagement" phenomenon, and prevent motion failure.

[0041] The specific parameter settings for this ball valve are as follows:

[0042] Let F be the origin of the spatial rectangular coordinate system formed by the vertical centerline 1 of the valve body and valve core, the horizontal centerline 20 of the valve body and valve core, and the longitudinal centerline 27 of the valve body and valve core, and let F be the rotation center of the valve core 23. Let the vertical centerline 1 of the valve body and valve core be the rotation axis of the valve core 23. Let the horizontal centerline 20 of the valve body and valve core, the longitudinal centerline 27 of the valve body and valve core, the flow channel centerline 29 of the valve core, the inlet flow channel centerline 30, and the outlet flow channel centerline 31 all be on the same plane.

[0043] Let the coordinates of F be (0, 0, 0). When the ball valve is closed, the center of the spherical sealing surface 13 of the first sealing ring 21 is C, the radius is SR3, and the coordinates of C are (-E3, -E4, 0). The center of the spherical sealing surface 13 of the second sealing ring 10 is A, the radius is SR1, and the coordinates of A are (E2, E1, 0).

[0044] The valve core has two end faces that are spherical arc-shaped along the valve core flow channel 7. The center of the sphere at the valve core inlet end is B and the radius is SR2. The coordinates of B are (-E3, E1, 0). The center of the sphere at the valve core outlet end is D and the radius is SR4. The coordinates of D are (E2, -E4, 0).

[0045] The inlet flow channel centerline 30 and the outlet flow channel centerline 31 are located on both sides of the valve body and valve core transverse centerline 20 and are parallel to the valve body and valve core transverse centerline 20. The offset distance between the inlet flow channel centerline 30 and the valve body and valve core transverse centerline 20 is E5, and the offset distance between the outlet flow channel centerline 31 and the valve body and valve core transverse centerline 20 is E6. In this embodiment, for ease of manufacturing and processing, E1=E2=E3=E4=E5=E6=1~5mm, SR1=SR3, and SR2=SR4.

[0046] The line LM connecting the center L at the inlet end of the valve body to the center M at the outlet end is the valve body flow channel centerline 28. When the ball valve is in the open state, the valve body flow channel centerline 28 and the valve body core transverse centerline 20 are provided with an angle α.

[0047] The line PN connecting the center P at the inlet end of the valve core flow channel 7 of the valve core 23 to the center N at the outlet end of the valve core flow channel 7 is the valve core flow channel centerline 29. When the ball valve is in the closed state, the valve core flow channel centerline 29 and the longitudinal centerline 27 of the valve body and valve core are provided with an angle β.

[0048] In this embodiment, α=β=arctanE1 / (SR1-E1), so that when the ball valve is in the open state, the center line 29 of the valve core flow channel coincides with the center line 28 of the valve body flow channel, and the valve core flow channel is just placed between the inlet end and the outlet end. With the cooperation of the above structures, on the one hand, the integrity of the main function of the ball valve is guaranteed, and on the other hand, by setting the eccentricity, when the valve core rotates, the spherical sealing surface 13 of the sealing ring and the conical sealing surface 14 of the valve body can be separated or closed instantly, and its friction stroke is only 1 to 2°, which can greatly reduce the wear between the sealing surfaces and greatly improve the service life of the sealing surfaces.

[0049] The vertex of the conical sealing surface at the inlet end of the valve body is G, and the vertex of the conical sealing surface at the outlet end of the valve body is H. Point G is located on the center line 30 of the inlet flow channel, and the offset distance from point G to the longitudinal center line 27 of the valve body core is E7. Point H is located on the center line 31 of the outlet flow channel, and the offset distance from point H to the longitudinal center line 27 of the valve body core is E8. In this embodiment, E7=E8.

[0050] As can be seen from the above description, this device has a total of 8 eccentricities E1, E2, E3, E4, E5, E6, E7, E8 and one eccentricity angle β, therefore this application is collectively referred to as nine-eccentric.

[0051] The working process of this device is as follows:

[0052] like Figure 3 , Figure 4 , Figure 5 The image shows the ball valve changing from the closed state to the open state.

[0053] Rotating the upper valve stem counterclockwise by 90 degrees causes the upper valve stem 2 to rotate, thereby rotating the valve core 23 and initially achieving... Figure 5 As shown in the semi-open state, the valve body inlet and outlet are connected and a certain flow is generated. As the valve core 23 rotates further, the valve core flow channel of the valve core 23 rotates to between the valve body inlet and outlet. When the valve core flow channel centerline PN coincides with the valve body flow channel centerline LM, the upper valve stem 2 reaches the limit point, thus completing the opening of the valve. When the valve is closed, rotating the upper valve stem 90 degrees clockwise will completely close the ball valve.

[0054] The above are merely preferred embodiments of the present invention and do not limit the patent scope of the present invention. Any equivalent structural transformations made under the concept of the present invention using the description and drawings of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A nine-eccentric hard-seal ball valve, comprising a valve body and a valve core (23), wherein the valve core (23) is installed in the valve body, and the ball valve opens when the valve core (23) rotates 90 degrees counterclockwise and closes when it rotates 90 degrees clockwise; wherein the vertical center line (1), the horizontal center line (20), and the longitudinal center line (27) of the valve body and valve core constitute the coordinate axes of a spatial rectangular coordinate system, wherein the valve body is provided with an inlet end and an outlet end, and the valve core (23) is provided with a valve core flow channel (7) in the middle, wherein when the ball valve is open, the valve body inlet end is connected to the valve body outlet end through the valve core flow channel (7), wherein the axial center lines of the valve body inlet end and the valve body outlet end are respectively the inlet end flow channel center line (30) and the outlet end flow channel center line (31), and the line PN connecting the two ends of the valve core flow channel (7) is the valve core flow channel center line (29), characterized in that: The origin of the spatial rectangular coordinate system is the rotation center F of the valve core (23). The vertical center line (1) of the valve body and valve core is the rotation axis of the valve core (23). A first sealing ring (21) and a second sealing ring (10) are symmetrically fixed on the outer surface of the valve core (23), on both sides of the valve core flow channel center line (29), with the rotation center F of the valve core (23) as the center. A spherical sealing surface (13) is provided on the outer surface of the first sealing ring (21) and the second sealing ring (10). A conical sealing surface (14) corresponding to the spherical sealing surface (13) is provided on the valve body inlet end and valve body outlet end. When the ball valve is closed, the spherical sealing surface (13) and the conical sealing surface (14) form a spherical-conical sealing pair. Let the center of the spherical sealing surface of the first sealing ring (21) be C, and the center of the spherical sealing surface of the second sealing ring (10) be A. The transverse centerline (20), longitudinal centerline (27), flow channel centerline (29), inlet flow channel centerline (30), and outlet flow channel centerline (31) of the valve body and valve core are all on the same plane. Assuming the above plane is a rotation plane, the ball center C and ball center A are offset relative to the rotation center F of the valve core (23) in both the longitudinal and transverse directions on the rotation plane. The inlet flow channel centerline (30) and the outlet flow channel centerline (31) are located on both sides of the valve body and valve core transverse centerline (20) and are parallel to the valve body and valve core transverse centerline (20). The inlet flow channel centerline (30) and the valve body and valve core transverse centerline (20) are offset by a distance E5, and the outlet flow channel centerline (31) and the valve body and valve core transverse centerline (20) are offset by a distance E6. When the ball valve is closed, the valve core flow channel centerline (29) and the valve body valve core longitudinal centerline (27) are provided with an angle β; the center of the valve body inlet end facing the valve core end face is L, the center of the valve body outlet end facing the valve core end face is M, the line connecting L and M is the valve body flow channel centerline (28), and the valve body flow channel centerline (28) and the valve body valve core transverse centerline (20) are provided with an angle α.

2. The nine-eccentric hard-seal ball valve according to claim 1, characterized in that: The valve core (23) has two spherical arc-shaped end faces along the valve core flow channel direction. The center of the sphere at the inlet end of the valve core (23) is B, and the center of the sphere at the outlet end of the valve core (23) is D. Let the vertical centerline (1), the horizontal centerline (20), and the longitudinal centerline (27) of the valve body and valve core be the Z-axis, X-axis, and Y-axis of the spatial rectangular coordinate system, respectively. Let the coordinates of F be (0, 0, 0). Then, when the ball valve is closed, the coordinates of the center C of the spherical sealing surface of the first sealing ring (21) are (-E3, -E4, 0), the coordinates of the center A of the spherical sealing surface of the second sealing ring (10) are (E2, E1, 0), the coordinates of the center B of the end face of the valve core inlet are (-E3, E1, 0), and the coordinates of the center D of the end face of the valve core outlet are (E2, -E4, 0). And E1=E2=E3=E4=E5=E6=1~5mm.

3. The nine-eccentric hard-seal ball valve according to claim 2, characterized in that: The radius of the ball center of the inlet end of the valve core (23) is SR2, the radius of the ball center of the outlet end of the valve core (23) is SR4, the radius of the spherical sealing surface of the first sealing ring (21) is SR3, the radius of the spherical sealing surface of the second sealing ring (10) is SR1, SR1=SR3, SR2=SR4, and SR2≤(SR1-2E1).

4. The nine-eccentric hard-seal ball valve according to claim 3, characterized in that: α=β。 5. The nine-eccentric hard-seal ball valve according to claim 4, characterized in that: The vertex of the conical sealing surface at the inlet end of the valve body is G, and the vertex of the conical sealing surface at the outlet end of the valve body is H. Point G is set on the center line (30) of the flow channel at the inlet end, and point H is set on the center line (31) of the flow channel at the outlet end.

6. The nine-eccentric hard-seal ball valve according to claim 5, characterized in that: The offset distance from point G to the longitudinal center line (27) of the valve body and valve core is E7, and the offset distance from point H to the longitudinal center line (27) of the valve body and valve core is E8, E7=E8.

7. The nine-eccentric hard-seal ball valve according to any one of claims 1 to 6, characterized in that: The valve core has a first mounting post (19) and a second mounting post (8) on its two outer sides. The outer end faces of the first mounting post (19) and the second mounting post (8) are parallel connecting surfaces, and the connecting surfaces are parallel to the vertical center line (1) of the valve body and valve core. One side of the first and second sealing rings is a spherical sealing surface, and the other side is provided with slots that match the first mounting post (19) and the second mounting post (8). The first sealing ring (21) and the second sealing ring (10) are respectively installed on the first mounting post (19) through the slots. On the first mounting post (19) and the second mounting post (8), on the connecting surface of the first mounting post (19) and the second mounting post (8), there are multiple screw holes perpendicular to the connecting surface symmetrically arranged with the midpoint of the connecting surface as the center. The first and second sealing rings are provided with countersunk through holes that match the position of the screw holes. Pull screws (9) are installed in the countersunk through holes of the first and second sealing rings. Threaded through holes are also provided on the first and second sealing rings between adjacent countersunk through holes. Multiple threaded through holes are arranged symmetrically in the center. Thrust screws (11) are threadedly connected in the threaded through holes. The first sealing ring (21) and the second sealing ring (10) are fixed to the first mounting post (19) and the second mounting post (8) respectively by tension screws (9). The distance between the first sealing ring and the second sealing ring and the conical sealing surface of the valve body is adjusted by tension screws (9) and thrust screws (11).

8. The nine-eccentric hard-seal ball valve according to claim 7, characterized in that: The spherical sealing surface (13) of the valve core (23) and the conical sealing surface (14) of the valve body are made of stainless wear-resistant alloy materials with different hardness.

9. The nine-eccentric hard-seal ball valve according to claim 7, characterized in that: The valve body includes a middle valve body (3), an outlet valve body (6), and an inlet valve body (22). The middle valve body (3) is cylindrical. The outlet valve body (6) and the inlet valve body (22) are fixed at both ends of the middle valve body (3) to form the inlet and outlet ends of the valve body. The valve core (23) is installed in the inner cavity of the middle valve body (3). The upper valve stem (2) and the lower valve stem (15) are respectively installed at the upper and lower ends of the middle valve body (3). The central axis of the upper valve stem (2) and the lower valve stem (15) coincides with the vertical center line (1) of the valve core of the valve body. The valve core (23) is supported in the middle valve body (3) by the upper valve stem (2) and the lower valve stem (15). The valve core (23) is driven to rotate by the upper valve stem (2).

10. The nine-eccentric hard-seal ball valve according to claim 9, characterized in that: The outlet valve body (6) and the inlet valve body (22) are flange-type valve bodies or welded valve bodies.

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