Bidirectional sealing frictionless track ball valve

Abstract

The invention discloses a two-way sealed frictionless track ball valve, comprising a valve body, a valve cover, a bracket, a driving device, a valve stem, a sphere and a valve seat, wherein a first flow channel and a second flow channel are arranged in the valve body; a track groove is provided on the valve stem, the track groove comprises a vertical portion and an arc portion extending downward, a limit screw extending into the track groove and matching the track groove is installed on the bracket, an operating part is provided at the lower end of the valve stem, an axial hole for the operating part to extend into is provided at the upper end of the sphere, an axle pin for matching with the operating part is installed on the inner wall of the axial hole, the operating part comprises a pressure relief vertical section, an opening and closing inclined section and a rotating vertical section, a through port is provided on the sphere, a pressure relief module is installed at the inner end of the through port, when the valve stem goes up and the pressure relief vertical section matches the axle pin, the sphere is pressed against the valve seat, and the rotating vertical section of the operating part triggers the pressure relief module to open, thereby connecting the first flow channel and the second flow channel. The invention can reduce working noise and improve the service life of the valve.

Description

Technical Field

[0001] The invention relates to the technical field of valves, in particular to a bidirectional sealing frictionless track ball valve. Background Art

[0002] Track ball valve is a ball valve with special structure. Because track ball valve can realize valve core rotation opening and closing, switch without friction, and can realize forced sealing. In the chemical field, it is more and more widely used, especially in the conditions of fast cut-off and high and low temperature alternating working conditions, such as: alternating temperature track ball valve and molecular sieve track ball valve for inlet and outlet of low temperature cold box of natural gas molecular sieve dehydration unit, hydrogenation unit, natural gas metering station, large ethylene unit, etc.

[0003] The working principle of the existing track ball valve is: the valve stem moves up or down under the action of the hand wheel, the guide groove on the valve stem contacts the guide pin, and the valve stem performs a linear motion for a period of time and then rotates 90 degrees. During the linear motion, the wedge surface at the lower end of the valve stem pushes the ball close to the valve seat to achieve sealing, or leaves the valve seat to open the valve; then, under the action of the guide groove and the guide pin, the valve stem drives the ball to rotate 90 degrees. The opening and closing process of the valve is achieved through the rising and falling movement of the valve stem. However, at the moment of opening, the existing track ball valve will have a huge impact on the inner wall of the valve due to the high pressure at the moment of opening the valve, which not only makes a lot of noise, but also causes certain damage to the internal components of the valve, reducing the service life of the valve. Summary of the invention

[0004] The purpose of the present invention is to provide a bidirectional sealed frictionless track ball valve, which can reduce the instantaneous pressure when the valve is opened, weaken the impact of the medium on the inner wall of the valve, thereby reducing working noise, and at the same time avoid damage to the internal parts of the valve by the high-pressure medium, which can increase the service life of the valve.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a two-way sealed frictionless track ball valve, comprising a valve body, a valve cover, a bracket, a driving device, a valve stem, a sphere and a valve seat, wherein a first flow channel and a second flow channel are arranged in the valve body, the valve cover is installed on the upper end of the valve body, the bracket is installed on the upper end of the valve cover, the driving device is installed on the bracket, the valve stem passes through the bracket and the valve cover in sequence and extends into the valve body, the outer end of the valve stem is linked to the output end of the driving device, the inner end of the valve stem is linked to the sphere arranged in the valve body, the lower end of the sphere is provided with a rotating convex portion, and the bottom of the valve body is provided with an active groove for the rotating convex portion to be embedded; a track groove is opened on the valve stem, and the track groove includes a vertical portion and an arc portion extending downwardly, and the bracket is provided with a driving device. A limit screw is provided which extends into the track groove and is compatible with the track groove. An operating part is provided at the lower end of the valve stem. An axial hole is provided at the upper end of the sphere for the operating part to extend into, and an axle pin for cooperating with the operating part is installed on the inner wall of the axle hole. The operating part includes a pressure relief vertical section, an opening and closing inclined section, and a rotating vertical section which are arranged in sequence from top to bottom. The sphere is provided with a through opening for connecting the first flow channel and the second flow channel when the sphere abuts against the valve seat, and a pressure relief module which is linked to the operating part is installed at the inner end of the through opening. When the valve stem moves upward and the pressure relief vertical section cooperates with the axle pin, the sphere abuts against the valve seat, and the rotating vertical section of the operating part triggers the pressure relief module to open, thereby connecting the first flow channel and the second flow channel.

[0006] By adopting the above technical solution, when the valve is opened, the valve stem will first move upward a distance, at which time the shaft pin cooperates with the pressure relief vertical section on the valve stem operating part, and the rotating vertical section of the valve stem operating part triggers the opening of the pressure relief module, connecting the first flow channel and the second flow channel, and part of the medium in the first channel first flows from the pressure relief module to the second flow channel for upstream pressure relief, and then as the opening and closing inclined section on the valve stem operating part cooperates with the shaft pin, the ball leaves the valve seat, and finally the rotating vertical section on the valve stem operating part cooperates with the shaft pin, and the ball rotates to fully open. Since the pressure is pre-relieved through the pressure relief module when the valve is opened, the instantaneous pressure of the valve opening can be reduced, and the impact of the medium on the inner wall of the valve can be weakened, thereby reducing the working noise, while avoiding damage to the internal parts of the valve by the high-pressure medium, which can increase the service life of the valve.

[0007] The present invention is further configured as follows: the pressure relief module includes a pressure relief rod, a linkage rod and a movable inner core, the pressure relief rod is installed at a position of the sphere corresponding to the inner end of the through hole, the end of the pressure relief rod corresponding to the through hole is provided with a movable inner cavity along the extending direction of the pressure relief rod, the movable inner core is slidably arranged in the movable inner cavity along the direction approaching or away from the through hole, and a first spring is installed in the movable inner cavity to apply a force to the movable inner core in the direction away from the through hole, the end of the movable inner core away from the through hole is provided with a conical linkage part with an inclined surface on the upper side, the end of the movable inner core close to the through hole is provided with a pressure relief channel along the extending direction of the movable inner core, the side portion of the movable inner core is provided with a plurality of inner holes connected with the pressure relief channel, the side portion of the pressure relief rod is provided with a plurality of outer holes connected with the movable inner cavity, when the conical linkage part of the movable inner core is tightly abutted against the inner end of the movable inner cavity, the inner The hole and the outer hole are staggered; a guide hole is set through the middle part of the pressure relief rod, the linkage rod passes through the guide hole, and the upper and lower ends of the linkage rod are respectively provided with a first threaded section and a second threaded section, the first threaded section is threadedly connected with a first limiting nut, and a second spring is sleeved on the outer periphery of the first threaded section, the two ends of the second spring are respectively abutted against the first limiting nut and the pressure relief rod, the second threaded section is threadedly connected with a second limiting nut, and the second limiting nut is abutted against the outer wall of the pressure relief rod, and the second threaded section is also threadedly connected with a locking nut for abutting against the second limiting nut, and the part of the linkage rod corresponding to the active inner cavity is provided with a through opening for the conical linkage part to extend into, when the rotating vertical section on the valve stem operating part presses the linkage rod downward, the linkage rod pushes the active inner core downward to move in the direction close to the through opening, and causes the inner hole and the outer hole to be conductive.

[0008] By adopting the above technical scheme, in the pre-opening pressure relief stage of the valve, the rotating vertical section of the valve stem operating part leaves the linkage rod of the pressure relief module, and the linkage rod moves upward under the action of the second spring. At this time, the movable inner core moves to the left under the action of the first spring, and the inner hole on the movable inner core is connected to the outer hole on the pressure relief rod. The medium in the first flow channel flows from the pressure relief channel, the inner hole, and the outer hole to the second channel in sequence, and the pressure relief is performed in advance. The pressure relief action is sensitive, and the structure is simple and reliable.

[0009] The present invention is further configured as follows: a positioning groove is provided at the inner end of the through opening, a threaded groove is provided at the other end of the sphere corresponding to the through opening, a square hole is provided at the inner end of the threaded groove, a limit block with a square cross-section is provided at the end of the pressure relief rod away from the through opening, the limit block is inserted in the square hole, and the end of the pressure relief rod away from the limit block is embedded in the positioning groove, a clamping screw is threadedly connected on the threaded groove, and the inner end of the clamping screw is tightly pressed against the limit block; a first sealing ring for sealing with the inner wall of the positioning groove is installed on the outer periphery of the pressure relief rod, and a second sealing ring for sealing with the inner wall of the movable inner cavity is respectively installed at the positions on both sides of the inner hole corresponding to the outer periphery of the movable inner core.

[0010] By adopting the above technical solution, the pressure relief rod is arranged across the sphere, and support points are arranged at both ends, which has the advantages of stable and reliable structure. One end of the pressure relief rod is limited by a limit block of a square structure, so that it can always remain in the same direction after installation, that is, the linkage rod can always cooperate with the valve stem, thereby ensuring the reliability of the pressure relief function of the pressure relief module.

[0011] The present invention is further configured such that an elastic pad is sandwiched between the inner end of the clamping screw and the limiting block.

[0012] By adopting the above technical solution, the elastic pad can not only make the clamping screw and the pressure relief rod fit more tightly, reduce the requirements for the precision of the tolerance of the parts, and be more conducive to processing and production, but also when tightening the clamping screw, the elastic pad can provide a reverse pre-tightening force for the clamping screw, thereby increasing the thread friction between the clamping screw and the thread groove, and preventing the clamping screw from loosening.

[0013] The present invention is further configured such that a circular groove is formed at one end of the limit block, an end of the pressure relief rod away from the through opening is embedded in the circular groove, and the pressure relief rod and the limit block are fixed together by a cylindrical pin.

[0014] By adopting the above technical solution, the limit block and the pressure relief rod adopt a split structure, which is more conducive to processing and assembly production.

[0015] The present invention is further configured such that a guide groove is provided on the side of the movable inner core along the length direction, a screw hole is provided on the side of the pressure relief rod along the radial direction, a hexagonal stud is threadedly connected to the screw hole, and the inner end of the hexagonal stud is inserted into the guide groove.

[0016] By adopting the above technical solution, the movable inner core can be limited in the circumferential direction so that it can only slide along its own extension direction, that is, it can ensure that the inclined surface of the conical linkage part of the movable inner core is always arranged upward.

[0017] The present invention is further configured such that an annular recess is provided on the outer periphery of the movable inner core, and a plurality of inner holes are provided between the annular recess and the pressure relief channel.

[0018] By adopting the above technical solution, an annular recess is provided to connect all inner holes and outer holes, thereby avoiding the situation where some inner holes and outer holes cannot be connected due to processing or installation angle factors.

[0019] The present invention is further configured such that a portion of the movable inner core corresponding to the opening end of the pressure relief channel is threadedly connected with a limiting screw sleeve, and two ends of the first spring are respectively in contact with the limiting screw sleeve and the movable inner core.

[0020] By adopting the above technical solution, the first spring is limited by the limiting screw sleeve, the limiting structure is simple and reliable, and the assembly is very convenient.

[0021] The present invention is further configured such that a clearance groove is provided at a position corresponding to the upper end of the opening of the linkage rod, and a roller for cooperating with the upper side surface of the conical linkage portion is rotatably connected to the clearance groove via a rotating shaft.

[0022] By adopting the above technical solution and the rolling matching structure, the matching between the linkage rod and the tapered linkage part is made smoother.

[0023] The present invention is further configured that a sealing assembly is also provided between the valve cover and the valve stem, and the sealing assembly includes a packing pressure plate, a packing pressure cover, an upper packing, a spacer ring, a lower packing, a gasket and a sleeve which are sequentially sleeved on the outer periphery of the valve stem from top to bottom, the upper packing, the spacer ring, the lower packing, the gasket and the sleeve are arranged between the valve stem and the valve cover, the sleeve is threadedly connected to the valve cover, and the lower end of the sleeve is provided with a limiting flange which is tightly abutted against the inner end of the valve cover, the packing pressure plate is connected to the valve stem by bolts, and the packing pressure cover is pressed against the upper end of the upper packing, the upper end of the upper packing is provided with a first conical protrusion extending in a ring shape, the lower end of the packing pressure cover is provided with a first conical recess which matches the first conical protrusion, the upper end of the gasket is provided with a second conical protrusion extending in a ring shape, and the lower end of the lower packing is provided with a second conical recess which matches the second conical protrusion.

[0024] By adopting the above technical solution, reliable sealing between the valve stem and the valve cover can be ensured to prevent the internal medium from leaking from the gap between the two. The conical matching structure of the packing and the tighter the packing pressure plate are connected by bolts, the better the sealing performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall appearance structure of the present invention;

[0026] Figure 2 A cross-sectional view of the present invention as a whole;

[0027] Figure 3 for Figure 2 The structural diagram of the pressure relief module of the middle A structure when it is opened;

[0028] Figure 4 for Figure 2 The structural diagram of the pressure relief module of the middle A structure when it is closed;

[0029] Figure 5 for Figure 2 Schematic diagram of the enlarged structure of part B in the middle.

[0030] In the figure: 1. valve body; 2. valve cover; 3. bracket; 4. driving device; 5. valve stem; 6. sphere; 7. valve seat; 8. first flow channel; 9. second flow channel; 10. rotating convex part; 11. movable groove; 12. vertical part; 13. arc-shaped part; 14. limit screw; 15. operating part; 16. shaft hole; 17. shaft pin; 18. pressure relief vertical section; 19. opening and closing inclined section; 20. rotating vertical section; 21. through port; 22. pressure relief module; 23. pressure relief rod; 24. linkage rod; 25. movable inner core; 26. movable inner cavity; 27. first spring; 28. conical linkage part; 29. ​​pressure relief channel; 30. inner hole; 31. outer hole; 32. guide hole; 33. first threaded section; 34. second threaded section; 35. first limit nut; 36. second spring ; 37. Second limiting nut; 38. Anti-loosening nut; 39. Overpass; 40. Positioning groove; 41. Threaded groove; 42. Square hole; 43. Limit block; 44. Pressing screw; 45. First sealing ring; 46. Second sealing ring; 47. Elastic pad; 48. Round groove; 49. Cylindrical pin; 50. Guide groove; 51. Screw hole; 52. Hexagon socket stud; 53. Annular recess; 54. Limiting screw sleeve; 55. Displacement groove; 56. Roller; 57. Sealing assembly; 58. Packing pressure plate; 59. Packing gland; 60. Upper packing; 61. Spacer ring; 62. Lower packing; 63. Washer; 64. Bushing; 65. Limiting flange; 66. First conical protrusion; 67. First conical recess; 68. Second conical protrusion; 69. Second conical recess; 70. Track groove. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] Example: As attached Figures 1 to 5The bidirectional sealing frictionless track ball valve shown in the figure comprises a valve body 1, a valve cover 2, a bracket 3, a driving device 4, a valve stem 5, a ball 6 and a valve seat 7. The valve body 1 is provided with a first flow channel 8 and a second flow channel 9. The valve cover 2 is mounted on the upper end of the valve body 1, the bracket 3 is mounted on the upper end of the valve cover 2, and the driving device 4 is mounted on the bracket 3. In this embodiment, the driving device 4 is a combination of a hand wheel and a worm gear transmission box. The valve stem 5 sequentially penetrates the bracket 3 and the valve cover 2 and extends into the valve body 1. The outer end of the valve stem 5 is linked to the output end of the driving device 4, and the inner end of the valve stem 5 is linked to the ball 6 arranged in the valve body 1. The lower end of the ball 6 is provided with a rotating protrusion 10, and the bottom of the valve body 1 is provided with an active groove 11 for the rotating protrusion 10 to be embedded; a track groove 70 is opened on the valve stem 5, and the track groove 70 includes a vertical portion 12 and an arc portion 13 extending downwardly. A limit screw 14 is inserted into the track groove 70 and matched with the track groove 70. The lower end of the valve stem 5 is provided with an operating portion 15. The upper end of the sphere 6 is provided with an axial hole 16 for the operating portion 15 to extend therein, and an axial pin 17 for cooperating with the operating portion 15 is installed on the inner wall of the axial hole 16. The operating portion 15 includes a pressure relief vertical section 18, an opening and closing inclined section 19 and a rotating vertical section 20 arranged in sequence from top to bottom. The sphere 6 is provided with a There is a through opening 21 for connecting the first flow channel 8 and the second flow channel 9 when the ball 6 abuts against the valve seat 7. A pressure relief module 22 that is linked to the operating part 15 is installed at the inner end of the through opening 21. When the valve stem 5 moves upward and the pressure relief vertical section 18 cooperates with the shaft pin 17, the ball 6 abuts against the valve seat 7, and the rotating vertical section 20 of the operating part 15 triggers the pressure relief module 22 to open, thereby connecting the first flow channel 8 and the second flow channel 9. When the valve is opened, the valve stem 5 will first move upward a distance, at which time the shaft pin 17 cooperates with the pressure relief vertical section 18 on the valve stem 5 operating part 15, and the rotating vertical section 20 of the valve stem 5 operating part 15 triggers the pressure relief module 22 to open, connecting the first flow channel 8 and the second flow channel 9. Part of the medium in the first channel first flows from the pressure relief module 22 to the second flow channel 9 for upstream pressure relief, and then as the opening and closing inclined section 19 on the valve stem 5 operating part 15 cooperates with the shaft pin 17, the ball 6 leaves the valve seat 7, and finally the rotating vertical section 20 on the valve stem 5 operating part 15 cooperates with the shaft pin 17, and the ball 6 rotates to fully open. Since the pressure is relieved in advance by the pressure relief module 22 when the valve is opened, the instantaneous pressure of the valve opening can be reduced, and the impact of the medium on the inner wall of the valve can be weakened, thereby reducing the working noise and avoiding the damage of the internal parts of the valve by the high-pressure medium, which can improve the service life of the valve.

[0033] As attached Figures 2 to 4As shown, the pressure relief module 22 includes a pressure relief rod 23, a linkage rod 24 and a movable inner core 25. The pressure relief rod 23 is cylindrical in shape. The pressure relief rod 23 is installed at a position of the inner end of the sphere 6 corresponding to the through-port 21. An end of the pressure relief rod 23 corresponding to the through-port 21 is provided with an movable inner cavity 26 along the extending direction of the pressure relief rod 23. The cross section of the movable inner cavity 26 is circular. The movable inner core 25 is slidably arranged in the movable inner cavity 26 along the direction close to or away from the through-port 21, and a movable inner cavity 26 is installed to exert pressure on the movable inner core 25. A first spring 27 of a force acting in a direction away from the through-hole 21 is provided, and a conical linkage portion 28 with an inclined upper side is provided at one end of the movable inner core 25 away from the through-hole 21. A pressure relief passage 29 is provided at one end of the movable inner core 25 close to the through-hole 21 along the extending direction of the movable inner core 25. A plurality of inner holes 30 connected to the pressure relief passage 29 are provided through the side of the movable inner core 25, and a plurality of outer holes 31 connected to the movable inner cavity 26 are provided through the side of the pressure relief rod 23. When the conical linkage portion 28 of the movable inner core 25 is connected to the inner cavity 26, the pressure relief rod 23 is provided with a plurality of outer holes 31 connected to the movable inner cavity 26. When the ends are pressed against each other, the inner hole 30 and the outer hole 31 are staggered; a guide hole 32 is provided through the middle of the pressure relief rod 23, the linkage rod 24 passes through the guide hole 32, and the upper and lower ends of the linkage rod 24 are respectively provided with a first threaded section 33 and a second threaded section 34, a first limiting nut 35 is threadedly connected to the first threaded section 33, and a second spring 36 is sleeved on the outer periphery of the first threaded section 33, the two ends of the second spring 36 are respectively in contact with the first limiting nut 35 and the pressure relief rod 23, and the second threaded section 34 is threadedly connected to the second threaded section 34. A limiting nut 37 is provided, and the second limiting nut 37 is in contact with the outer wall of the pressure relief rod 23. A locking nut 38 for abutting against the second limiting nut 37 is also threadedly connected to the second threaded section 34. A portion of the linkage rod 24 corresponding to the movable inner cavity 26 is provided with a through opening 39 for the conical linkage portion 28 to extend into. When the rotating vertical section 20 on the operating portion 15 of the valve stem 5 presses down the linkage rod 24, the linkage rod 24 pushes the movable inner core 25 downward to move toward the direction close to the through opening 21, and causes the inner hole 30 and the outer hole 31 to be connected. In the pre-opening pressure relief stage of the valve, the rotating vertical section 20 of the operating part 15 of the valve stem 5 leaves the linkage rod 24 of the pressure relief module 22, and the linkage rod 24 moves upward under the action of the second spring 36. At this time, the movable inner core 25 moves to the left under the action of the first spring 27, and the inner hole 30 on the movable inner core 25 is connected with the outer hole 31 on the pressure relief rod 23. The medium in the first flow channel 8 flows from the pressure relief channel 29, the inner hole 30, and the outer hole 31 to the second channel in sequence, and the pressure relief is performed in advance. The pressure relief action is sensitive, and the structure is simple and reliable.

[0034] As attached Figures 2 to 4As shown, a positioning groove 40 is provided at the inner end of the through opening 21, a threaded groove 41 is provided at the other end of the sphere 6 corresponding to the through opening 21, a square hole 42 is provided at the inner end of the threaded groove 41, a limit block 43 with a square cross-section is provided at the end of the pressure relief rod 23 away from the through opening 21, the limit block 43 is inserted into the square hole 42, and the end of the pressure relief rod 23 away from the limit block 43 is embedded in the positioning groove 40, a clamping screw 44 is threadedly connected to the threaded groove 41, and the inner end of the clamping screw 44 is tightly pressed against the limit block 43; a first sealing ring 45 for sealing with the inner wall of the positioning groove 40 is installed on the outer periphery of the pressure relief rod 23, and a second sealing ring 46 for sealing with the inner wall of the active inner cavity 26 is installed at the positions on the outer periphery of the movable inner core 25 corresponding to the two sides of the inner hole 30. The pressure relief rod 23 is arranged across the sphere 6, and support points are arranged at both ends, which has the advantages of stable and reliable structure. One end of the pressure relief rod 23 is limited by a limit block 43 with a square structure, so that it can always remain in the same direction after installation, that is, the linkage rod 24 can always cooperate with the valve stem 5, thereby ensuring the reliability of the pressure relief function of the pressure relief module 22.

[0035] As attached Figures 2 to 4 As shown, an elastic pad 47 is sandwiched between the inner end of the clamping screw 44 and the limit block 43, and the elastic pad 47 can be made of silicone material. The elastic pad 47 can not only make the clamping screw 44 and the pressure relief rod 23 fit more tightly, reduce the requirements for the precision of the tolerance of the parts, and be more conducive to processing and production, but also when the clamping screw 44 is tightened, the elastic pad 47 can provide a reverse pre-tightening force for the clamping screw 44, increase the thread friction between the clamping screw 44 and the thread groove 41, and play the effect of preventing the clamping screw 44 from loosening.

[0036] As attached Figures 2 to 4 As shown, a circular groove 48 is formed at one end of the stop block 43, and the end of the pressure relief rod 23 away from the through opening 21 is embedded in the circular groove 48, and the pressure relief rod 23 and the stop block 43 are fixed together by a cylindrical pin 49. The stop block 43 and the pressure relief rod 23 adopt a split structure, which is more conducive to processing and assembly production.

[0037] As attached Figures 2 to 4 As shown, the side of the movable inner core 25 is provided with a guide groove 50 along the length direction, and the side of the pressure relief rod 23 is provided with a screw hole 51 through the radial direction, and the screw hole 51 is threadedly connected with a hexagonal screw 52, ​​and the inner end of the hexagonal screw 52 is inserted into the guide groove 50. This design has the effect of limiting the circumferential position of the movable inner core 25, so that it can only slide along its own extension direction, that is, it can ensure that the inclined surface of the tapered linkage portion 28 of the movable inner core 25 is always arranged upward.

[0038] As attached Figures 2 to 4As shown, an annular recess 53 is provided on the outer periphery of the movable inner core 25, and a plurality of inner holes 30 are provided between the annular recess 53 and the pressure relief channel 29, that is, the inner holes 30 are provided within the range of the annular recess 53. The annular recess 53 is provided to connect all the inner holes 30 and the outer holes 31, thereby avoiding the situation that some inner holes 30 and the outer holes 31 cannot be connected due to processing or installation angle factors.

[0039] As attached Figures 2 to 4 As shown, the movable inner core 25 is threadedly connected to the position of the opening end of the pressure relief channel 29 with a limiting screw sleeve 54, and the two ends of the first spring 27 are respectively in contact with the limiting screw sleeve 54 and the movable inner core 25. The first spring 27 is limited by the limiting screw sleeve 54, and the limiting structure is simple and reliable, and the assembly is very convenient.

[0040] As attached Figures 2 to 4 As shown, the linkage rod 24 is provided with a clearance groove 55 at the position corresponding to the upper end of the opening 39, and a roller 56 for cooperating with the upper side of the tapered linkage part 28 is rotatably connected in the clearance groove 55 through a rotating shaft. The rolling matching structure makes the cooperation between the linkage rod 24 and the tapered linkage part 28 smoother.

[0041] As attached Figure 4 As shown, a sealing assembly 57 is further provided between the valve cover 2 and the valve stem 5. The sealing assembly 57 includes a packing pressure plate 58, a packing gland 59, an upper packing 60, a spacer ring 61, a lower packing 62, a gasket 63 and a shaft sleeve 64 which are sequentially sleeved on the outer periphery of the valve stem 5 from top to bottom. The upper packing 60, the spacer ring 61, the lower packing 62, the gasket 63 and the shaft sleeve 64 are arranged between the valve stem 5 and the valve cover 2. The shaft sleeve 64 is threadedly connected to the inside of the valve cover 2, and the lower end of the shaft sleeve 64 is provided with a seal which is tightly abutted against the inner end of the valve cover 2. The limiting flange 65 of the valve stem 5 is provided, the packing pressure plate 58 is connected to the valve stem 5 by bolts, and the packing gland 59 is pressed tightly on the upper end of the upper packing 60. The upper end of the upper packing 60 is provided with a first conical protrusion 66 extending in an annular shape, and the lower end of the packing gland 59 is provided with a first conical recess 67 matching the first conical protrusion 66. The upper end of the gasket 63 is provided with a second conical protrusion 68 extending in an annular shape, and the lower end of the lower packing 62 is provided with a second conical recess 69 matching the second conical protrusion 68. This design can ensure reliable sealing between the valve stem 5 and the valve cover 2, and prevent the internal medium from leaking from the gap between the two. The conical matching structure of the packing, the tighter the packing pressure plate 58 is connected by bolts, the better the sealing performance.

Claims

1. A two-way sealed frictionless track ball valve, comprising a valve body (1), a valve cover (2), a bracket (3), a driving device (4), a valve stem (5), a ball (6) and a valve seat (7), wherein the valve body (1) is provided with a first flow channel (8) and a second flow channel (9), the valve cover (2) is mounted on the upper end of the valve body (1), the bracket (3) is mounted on the upper end of the valve cover (2), the driving device (4) is mounted on the bracket (3), the valve stem (5) sequentially penetrates the bracket (3) and the valve cover (2) and extends into the valve body (1), the outer end of the valve stem (5) is linked to the output end of the driving device (4), the inner end of the valve stem (5) is linked to the ball (6) arranged in the valve body (1), the lower end of the ball (6) is provided with a rotating protrusion (10), and the inner bottom of the valve body (1) is provided with a movable groove (11) for the rotating protrusion (10) to be embedded; characterized in that: The valve stem (5) is provided with a track groove (70), and the track groove (70) includes a vertical portion (12) and an arc portion (13) extending downward. A limit screw (14) is installed on the bracket (3) and extends into the track groove (70) and is compatible with the track groove (70). The lower end of the valve stem (5) is provided with an operating portion (15). The upper end of the ball (6) is provided with an axial hole (16) for the operating portion (15) to extend therein, and an axial pin (17) for matching with the operating portion (15) is installed on the inner wall of the axial hole (16). The operating portion (15) includes pressure relief vertical sections (18) arranged in sequence from top to bottom. , an opening and closing inclined section (19) and a rotating vertical section (20), the sphere (6) is provided with a through-hole (21) for connecting the first flow channel (8) and the second flow channel (9) when the sphere (6) abuts against the valve seat (7), and a pressure relief module (22) is installed at the inner end of the through-hole (21) and is linked with the operating part (15). When the valve stem (5) moves upward and the pressure relief vertical section (18) cooperates with the shaft pin (17), the sphere (6) and the valve seat (7) are tightly abutted, and the rotating vertical section (20) of the operating part (15) triggers the pressure relief module (22) to open, so that the first flow channel (8) and the second flow channel (9) are connected. ) are connected; the pressure relief module (22) comprises a pressure relief rod (23), a linkage rod (24) and a movable inner core (25); the pressure relief rod (23) is installed at a position of the inner end of the sphere (6) corresponding to the through-port (21); one end of the pressure relief rod (23) corresponding to the through-port (21) is provided with a movable inner cavity (26) along the extending direction of the pressure relief rod (23); the movable inner core (25) is slidably arranged in the movable inner cavity (26) in a direction approaching or moving away from the through-port (21); and a first spring (27) is installed in the movable inner cavity (26) for applying a force to the movable inner core (25) in a direction away from the through-port (21); The end of the movable inner core (25) away from the through-hole (21) is provided with a conical linkage portion (28) with an inclined surface on the upper side; the end of the movable inner core (25) close to the through-hole (21) is provided with a pressure relief passage (29) along the extension direction of the movable inner core (25); the side of the movable inner core (25) is provided with a plurality of inner holes (30) connected to the pressure relief passage (29); the side of the pressure relief rod (23) is provided with a plurality of outer holes (31) connected to the movable inner cavity (26); when the conical linkage portion (28) of the movable inner core (25) is pressed against the inner end of the movable inner cavity (26), the inner holes (30) and the outer holes (31) are staggered;A guide hole (32) is provided through the middle of the pressure relief rod (23), the linkage rod (24) passes through the guide hole (32), and the upper and lower ends of the linkage rod (24) are respectively provided with a first threaded section (33) and a second threaded section (34), the first threaded section (33) is threadedly connected with a first limiting nut (35), and a second spring (36) is sleeved on the outer periphery of the first threaded section (33), the two ends of the second spring (36) are respectively in contact with the first limiting nut (35) and the pressure relief rod (23), the second threaded section (34) is threadedly connected with a second limiting nut (37), and the first threaded section (34) is threadedly connected with a second limiting nut (37). The second limiting nut (37) is in contact with the outer wall of the pressure relief rod (23), and a locking nut (38) for being tightly pressed against the second limiting nut (37) is also threadedly connected to the second threaded section (34). A portion of the linkage rod (24) corresponding to the movable inner cavity (26) is provided with a through opening (39) for the conical linkage portion (28) to extend therein. When the rotating vertical section (20) on the operating portion (15) of the valve stem (5) presses down the linkage rod (24), the linkage rod (24) pushes the movable inner core (25) downward to move toward the direction close to the through opening (21), and causes the inner hole (30) and the outer hole (31) to be in conduction with each other. ; 2. The bidirectional sealing frictionless track ball valve according to claim 1 is characterized in that: The inner end of the through opening (21) is provided with a positioning groove (40), the other end of the sphere (6) corresponding to the through opening (21) is provided with a thread groove (41), the inner end of the thread groove (41) is provided with a square hole (42), the end of the pressure relief rod (23) away from the through opening (21) is provided with a limit block (43) with a square cross section, the limit block (43) is inserted into the square hole (42), and the end of the pressure relief rod (23) away from the limit block (43) is embedded in the positioning groove ( 40), a clamping screw (44) is threadedly connected to the threaded groove (41), and the inner end of the clamping screw (44) is tightly pressed against the limit block (43); a first sealing ring (45) for forming a sealing match with the inner wall of the positioning groove (40) is installed on the outer periphery of the pressure relief rod (23), and a second sealing ring (46) for forming a sealing match with the inner wall of the movable inner cavity (26) is installed at the positions on both sides of the outer periphery of the movable inner core (25) corresponding to the inner hole (30).

3. The bidirectional sealing frictionless track ball valve according to claim 2 is characterized in that: An elastic pad (47) is sandwiched between the inner end of the clamping screw (44) and the limiting block (43).

4. The bidirectional sealing frictionless track ball valve according to claim 2 is characterized in that: A circular groove (48) is formed at one end of the limit block (43), and one end of the pressure relief rod (23) away from the through opening (21) is embedded in the circular groove (48), and the pressure relief rod (23) and the limit block (43) are fixed together by a cylindrical pin (49).

5. The bidirectional sealing frictionless track ball valve according to claim 1, characterized in that: A guide groove (50) is provided on the side of the movable inner core (25) along the length direction, and a screw hole (51) is provided on the side of the pressure relief rod (23) along the radial direction. A hexagonal screw (52) is connected to the inner thread of the screw hole (51), and the inner end of the hexagonal screw (52) is inserted into the guide groove (50).

6. The bidirectional sealing frictionless track ball valve according to claim 1, characterized in that: An annular recess (53) is provided on the outer periphery of the movable inner core (25), and a plurality of inner holes (30) are provided between the annular recess (53) and the pressure relief channel (29).

7. The bidirectional sealing frictionless track ball valve according to claim 1, characterized in that: The movable inner core (25) is threadedly connected to a limiting screw sleeve (54) at a position corresponding to the opening end of the pressure relief channel (29), and the two ends of the first spring (27) are respectively in contact with the limiting screw sleeve (54) and the movable inner core (25).

8. The bidirectional sealing frictionless track ball valve according to claim 1, characterized in that: The linkage rod (24) is provided with a clearance groove (55) at a position corresponding to the upper end of the opening (39), and a roller (56) for cooperating with the upper side surface of the conical linkage part (28) is rotatably connected in the clearance groove (55) via a rotating shaft.

9. The bidirectional sealing frictionless track ball valve according to claim 1, characterized in that: A sealing assembly (57) is further provided between the valve cover (2) and the valve stem (5). The sealing assembly (57) comprises a packing pressure plate (58), a packing pressure cover (59), an upper packing (60), a spacer ring (61), a lower packing (62), a gasket (63) and a shaft sleeve (64) which are sequentially sleeved on the outer periphery of the valve stem (5) from top to bottom. The upper packing (60), the spacer ring (61), the lower packing (62), the gasket (63) and the shaft sleeve (64) are provided between the valve stem (5) and the valve cover (2). The shaft sleeve (64) is threadedly connected to the inside of the valve cover (2), and the lower end of the shaft sleeve (64) is provided with a sealing member which is screwed to the valve cover (2). ) inner end of the packing plate (58) is tightly pressed against the valve stem (5), the packing pressure plate (58) is connected to the valve stem (5) by bolts, and the packing cover (59) is pressed against the upper end of the upper packing (60), the upper end of the upper packing (60) is provided with a first conical protrusion (66) extending in an annular shape, the lower end of the packing cover (59) is provided with a first conical recess (67) matching with the first conical protrusion (66), the upper end of the gasket (63) is provided with a second conical protrusion (68) extending in an annular shape, and the lower end of the lower packing (62) is provided with a second conical recess (69) matching with the second conical protrusion (68).

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