A wear-resistant gate valve for the mining of combustible ice hydrate with an erosion-resistant tungsten carbide coating

Abstract

This invention discloses a wear-resistant gate valve for mining combustible ice hydrate with an erosion-resistant tungsten carbide coating, comprising a valve body, a valve cover, an actuator, a valve stem, and a gate. The valve cover is mounted on the upper end of the valve body and has a bracket. The actuator is mounted on the bracket. One end of the valve stem is connected to the actuator, and the other end of the valve stem extends into the valve body and is linked to the gate. The valve body has an inlet flow channel and an outlet flow channel, and a valve seat is provided at the inner end of the inlet flow channel. The gate includes a gate base, a sealing disc, and a drive mechanism that can drive the sealing disc to rotate around the central axis of the gate base. Both the sealing surface of the sealing disc and the sealing surface of the valve seat are coated with tungsten carbide. The bottom of the valve body cavity has a trigger mechanism that, when the gate moves downward, links with the drive mechanism and drives the sealing disc to rotate. This invention not only has strong erosion resistance and good wear resistance, but also eliminates ice crystals adhering to the sealing surface of the gate or valve seat through self-grinding during opening and closing, ensuring normal valve opening and closing, and making the structure more reliable.

Description

Technical Field

[0001] This invention relates to the field of valve structure technology, and in particular to a wear-resistant gate valve for the mining of combustible ice hydrate with an erosion-resistant tungsten carbide coating. Background Technology

[0002] Methane hydrate, also known as combustible ice, has the molecular formula CH4·H2O. It is a solid, cage-like crystalline compound formed when water and natural gas mix under medium to low pressure and low temperature conditions. It is distributed in the deep seabed or permafrost on land. Because it looks like ice and can burn when exposed to fire, it is called "combustible ice." Methane hydrate is referred to by Western scholars as a "21st-century energy source" or a "future new energy source."

[0003] Valves used in the extraction of combustible ice possess core characteristics such as high pressure / low temperature resistance, corrosion resistance, excellent sealing performance, and resistance to erosion and wear, while also needing to adapt to the special requirements of the extraction conditions. In the special extraction environment of combustible ice, characterized by high pressure, low temperature, and flammability, the rapid opening and closing characteristics of plug valves are helpful for emergency shut-off.

[0004] A gate valve is a type of valve that controls the flow of fluid by the vertical movement of a gate. It cannot be used to regulate flow rate. Its opening and closing element is a gate, which moves perpendicular to the direction of fluid flow. Sealing is achieved through the contact between the valve seat and the gate.

[0005] Currently, during prolonged periods of operation, gate valves used for extracting methane hydrate can fail to close completely due to ice crystal buildup on the sealing surfaces of the gate or valve seat. Using preheating mechanisms to raise the temperature causes the methane hydrate to decompose rapidly, releasing methane gas and potentially posing an explosion risk, thus compromising safety. Therefore, it is necessary to improve existing gate valves for extracting methane hydrate to address these issues. Summary of the Invention

[0006] The purpose of this invention is to provide a wear-resistant gate valve for the mining of combustible ice hydrate with an anti-erosion tungsten carbide coating. This invention not only has strong anti-erosion ability and good wear resistance, but also eliminates ice crystals attached to the sealing surface of the gate or valve seat through self-grinding during opening and closing, ensuring the normal opening and closing of the valve and making the structure more reliable.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a wear-resistant gate valve for the mining of combustible ice hydrate with an erosion-resistant tungsten carbide coating, comprising a valve body, a valve cover, an actuator, a valve stem, and a gate. The valve cover is installed on the upper end of the valve body, and a bracket is provided on the valve cover. The actuator is installed on the bracket. One end of the valve stem is connected to the output end of the actuator, and the other end of the valve stem extends into the valve body and is linked to the gate. The valve body is provided with an inlet flow channel and an outlet flow channel. A valve seat is provided at the inner end of the inlet flow channel. When the valve is closed, one end of the gate is pressed against the valve seat, and the other end of the gate is pressed against the inner end of the outlet flow channel. The gate includes a gate base, a sealing disc disposed on the gate base, and a drive mechanism that can drive the sealing disc to rotate around the central axis of the gate base. A tungsten carbide coating is provided on the sealing surface of the sealing disc and the sealing surface of the valve seat. A trigger mechanism is provided at the bottom of the valve body cavity, which is linked with the drive mechanism and drives the sealing disc to rotate when the gate moves downward.

[0008] By adopting the above technical solution, when the gate is closed downwards, the triggering mechanism triggers the drive mechanism to work, causing the sealing disc to rotate and remove ice crystals from the sealing surface. It utilizes the valve closing action itself to trigger the rotation, and can scrape off the attached ice crystals during the closing process without additional energy, ensuring the sealing surface is clean and guaranteeing reliable valve opening and closing. In addition, the sealing disc and valve seat sealing surfaces are coated with tungsten carbide, which can enhance wear resistance and corrosion resistance, extend the service life of the valve, and is suitable for the mining of combustible ice hydrate.

[0009] The invention is further configured such that the driving mechanism includes a driving piston and an energy storage piston; a first variable cavity and a second variable cavity are provided between the sealing disc and the gate base; a driving cavity is provided at the lower end of the gate base; the driving piston is axially movable within the driving cavity; a first sealing ring is installed on the outer circumferential surface of the driving piston to form a sealing fit with the inner circumferential surface of the driving cavity; a linkage rod is provided at the lower end of the driving piston, extending out of the driving cavity to cooperate with a triggering mechanism; a first driving spring and a second driving spring are also provided within the driving cavity to apply a downward force to the driving piston; an energy storage cavity is provided on the sealing disc; and the energy storage piston is axially movable. The piston is dynamically positioned in the energy storage cavity, which contains an energy storage spring that applies an inward force to the energy storage piston. A second sealing ring is installed on the outer circumference of the energy storage piston to form a sealing fit with the inner circumference of the energy storage cavity. A first channel is provided on the gate base to connect the drive cavity and the first variable cavity. A second channel is provided on the sealing disc to connect the energy storage cavity and the second variable cavity. The drive cavity, the first channel, the first variable cavity, the second variable cavity, the second channel, and the energy storage cavity are filled with drive oil. When the drive piston moves axially, the volumes of the first and second variable cavities change, causing the sealing disc to rotate relative to the gate body.

[0010] By adopting the above technical solution, the linear motion of the gate during downward movement is converted into the rotational motion of the sealing disc through a hydraulic drive mechanism. When the gate descends to the bottom, the triggering mechanism can directly push the linkage rod, triggering the drive piston to move upward. The change in the volume of the drive chamber is transmitted through the drive oil, causing the volume of the first and second variable chambers to change, thereby driving the sealing disc to rotate relative to the gate body. When the gate moves upward, the two pistons are reset by the spring, and the volume of the first and second variable chambers changes again, thereby driving the sealing disc to rotate in the opposite direction relative to the gate body. This achieves automatic cleaning of the sealing surface, effectively removes the attached ice crystals, ensures the complete sealing of the valve, and avoids the risk of combustible ice decomposition that may be caused by preheating.

[0011] The present invention is further configured such that a shaft hole is provided at the center of the gate plate base, and a connecting shaft is provided on the side of the sealing disc near the gate plate base. The connecting shaft extends through the shaft hole to the other side of the gate plate base, and a limiting ring for axially limiting the connecting shaft is detachably installed on the connecting shaft.

[0012] By adopting the above technical solution, it can be ensured that the sealing disc can rotate relative to the gate plate base without axial displacement, the connection structure is stable and reliable, and the detachable structure of the limit ring ensures that the sealing disc and the gate plate base can be disassembled, which is conducive to the initial assembly and the subsequent disassembly and maintenance.

[0013] The invention is further configured such that the limiting ring is sleeved on the outer periphery of the connecting shaft, and the limiting ring is provided with a locking assembly, the locking assembly including a locking tumbler, a first return spring, a first screw plug, and an operating rod. A guide hole is radially provided on the outer circumference of the limiting ring, and a travel limiting hole communicating with the guide hole is opened on the end face of the limiting ring away from the gate plate base. The locking tumbler is axially movably disposed in the guide hole. The first screw plug is threadedly connected to the outer end of the guide hole. The first return spring is sandwiched between the first screw plug and the locking tumbler. The operating rod passes through the travel limiting hole and is threadedly connected to the locking tumbler. An annular locking groove is provided on the outer circumference of the connecting shaft. When the operating rod drives the locking tumbler to move axially, the inner end of the locking tumbler inserts into or disengages from the annular locking groove.

[0014] By adopting the above technical solution, which is a specific design of the detachable limit ring structure, after the first return spring presses the inner end of the locking tumbler into the annular locking groove of the connecting shaft, the limit ring and the connecting shaft can be locked. By moving the operating lever, the spring force of the first return spring is overcome, and the locking tumbler is driven to disengage from the annular locking groove of the connecting shaft, thereby unlocking the limit ring and the connecting shaft. The operation is very convenient.

[0015] The invention is further configured such that a linkage ring is keyed to the outer periphery of the connecting shaft, the linkage ring is sandwiched between the limiting ring and the gate plate base, the linkage ring has a first annular conical groove on the side near the gate plate base, the gate plate base has a second annular conical groove on the side near the linkage ring, the first annular conical groove and the second annular conical groove combine to form a first movable cavity, a plurality of first balls are rotatably disposed in the first movable cavity, the sealing disc has a third annular conical groove on the side near the gate plate body, the gate plate base has a fourth annular conical groove on the side near the sealing disc, the third annular conical groove and the fourth annular conical groove combine to form a second movable cavity, a plurality of second balls are rotatably disposed in the second movable cavity.

[0016] By adopting the above technical solution, the original surface contact friction between the sealing disc and the gate plate substrate is transformed into point contact rolling friction. This not only reduces the rotation starting torque, but also effectively reduces the frictional resistance during the rotation of the sealing disc, ensuring smooth rotation to remove ice crystals even under low-temperature conditions.

[0017] The invention is further configured such that the sealing disc has an annular groove corresponding to the outer periphery of the connecting shaft, and a movable partition is provided in the annular groove. One end of the movable partition is integrally connected to the inner circular surface of the annular groove, and the other end of the fixed partition is tightly fitted to the outer circular surface of the connecting shaft. The gate base has a fixed partition extending into the annular groove. The fixed partition and the movable partition divide the annular groove into the first variable cavity and the second variable cavity. The inner end of the fixed partition has an open ring for fitting around the outer periphery of the connecting shaft. When the sealing disc rotates, the inner end of the movable partition moves in an arc trajectory within the opening of the open ring. A third sealing ring is installed on the outer circular surface of the connecting shaft to form a sealing fit with the inner circular surface of the shaft hole. A fourth sealing ring is installed on the outer periphery of the sealing disc corresponding to the annular groove to form a sealing fit with the end face of the gate base.

[0018] By adopting the above technical solution, the movable partition acts as a force-bearing moving part. When the pressure inside the first variable cavity increases, the driving oil pushes the movable partition to rotate, thereby causing the sealing disc to rotate. When the pressure inside the second variable cavity increases, the driving oil pushes the movable partition to rotate in the opposite direction, thereby causing the sealing disc to reverse.

[0019] The present invention is further configured such that a positioning frustum is provided on the side of the sealing disc near the gate plate base, the connecting shaft, the annular groove and the third annular conical groove are all provided on the positioning frustum, the gate plate base is provided with a positioning groove that cooperates with the positioning frustum, and a bushing is provided between the inner circular surface of the positioning groove and the outer circular surface of the positioning frustum.

[0020] By adopting the above technical solution, not only can the installation accuracy of the sealing disc on the gate plate base be improved, but also the bushing set between the inner circular surface of the positioning groove and the outer circular surface of the positioning frustum, made of wear-resistant material, can isolate direct metal contact, adapt to thermal expansion and contraction deformation in low temperature environment to prevent jamming, and ensure smooth rotation of the sealing disc through low friction characteristics.

[0021] The invention is further configured such that a first internal hexagonal nut for limiting the lower stroke of the drive piston is threadedly connected to the position of the gate base corresponding to the outer end of the drive cavity, and the linkage rod passes through the first internal hexagonal nut; a second internal hexagonal nut is threadedly connected to the position of the sealing disc corresponding to the outer end of the energy storage cavity, and the two ends of the energy storage spring abut against the second internal hexagonal nut and the energy storage piston, respectively.

[0022] By adopting the above technical solution, and by setting the first internal hexagonal limit nut and the second internal hexagonal limit nut, the limit strokes of the drive piston and the energy storage piston are precisely limited respectively, ensuring that the piston movement is within a safe range during valve operation and avoiding malfunctions caused by excessive displacement.

[0023] The present invention is further configured such that an oil injection hole communicating with the drive cavity is provided on the side of the gate plate base away from the sealing disc, and a second plug is threadedly connected to the outer end of the oil injection hole.

[0024] By adopting the above technical solution, the direct connection design between the oil injection hole and the drive cavity ensures that the drive oil can flow into the drive cavity without obstruction. The oil injection hole is opened on the side of the gate plate base away from the sealing disc. This position avoids the complex area of ​​the sealing disc rotation mechanism and the valve cavity flow channel, allowing external operators to directly contact the oil injection point without interfering with the internal moving parts.

[0025] The invention is further configured such that a limiting boss is provided at the bottom of the valve body to limit the downward movement of the gate, and a triggering mechanism is disposed on the limiting boss. The triggering mechanism includes a throttling rod, an adjusting ring, a locking nut, and a second return spring. A sliding cavity is provided at the upper end of the limiting boss, and the throttling rod is vertically movably disposed in the sliding cavity. A guide flange is provided in the middle of the throttling rod, and a throttling sealing ring is provided on the outer circular surface of the guide flange to form a sealing fit with the inner circular surface of the sliding cavity. A limiting pressure ring for limiting the upper stroke of the guide flange is threadedly connected to the limiting boss. The upper end of the throttling rod passes through the limiting pressure ring to cooperate with the drive piston. Multiple throttling holes are provided through the guide flange, and the multiple throttling holes are evenly distributed in an arc trajectory. The locking nut is threadedly connected to the throttling rod and presses the adjusting ring against the lower end of the guide flange. An arc-shaped hole is provided on the throttling rod, and when the adjusting ring rotates, the arc-shaped hole communicates with one or more throttling holes.

[0026] By adopting the above technical solution, the limiting boss serves as a basic support component, limiting the end position of the gate's downward stroke and providing a stable mounting platform for the triggering mechanism, ensuring that the gate moves accurately to the closed position. The triggering mechanism uses the principle of a damper, slowly applying an upward thrust to the drive mechanism on the gate when the gate moves downward (the throttle rod moves downward slowly during the application of the thrust). The guide flange of the throttle rod has multiple throttle holes designed to work in conjunction with the adjusting ring. That is, the arc-shaped hole is connected to different numbers of throttle holes, thereby adjusting the damping force of the triggering mechanism in a stepwise manner. This allows the drive piston to move stably relative to the gate base, preventing sudden and rapid upward movement, thus protecting the gate components and significantly improving the service life of the valve. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the gate structure of the present invention; Figure 3 for Figure 2 Enlarged structural diagram of section A in the middle; Figure 4 for Figure 2 Enlarged structural diagram of section B in the middle; Figure 5 This is a schematic diagram of the structure of the first and second variable cavities of the present invention; Figure 6 This is a schematic diagram of the structure of the sealing disc of the present invention; Figure 7 for Figure 2 Enlarged structural diagram of section C; Figure 8 This is a schematic diagram of the structure of the limiting ring and locking assembly of the present invention; Figure 9 This is an exploded view of the limiting ring and locking assembly of the present invention; Figure 10 for Figure 1 Enlarged structural diagram of section D in the middle; Figure 11 This is a schematic diagram of the triggering mechanism of the present invention; Figure 12 This is an exploded view of the triggering mechanism of the present invention.

[0028] In the diagram: 1. Valve body; 2. Valve cover; 3. Actuator; 4. Valve stem; 5. Gate; 6. Bracket; 7. Inlet flow channel; 8. Outlet flow channel; 9. Valve seat; 10. Gate base; 11. Sealing disc; 12. Drive mechanism; 13. Tungsten carbide coating; 14. Trigger mechanism; 15. Drive piston; 16. Energy storage piston; 17. First variable cavity; 18. Second variable cavity; 19. Drive cavity; 20. First sealing ring; 21. Linkage rod; 22. First drive spring; 23. Second drive spring; 24. Energy storage cavity; 25. Energy storage spring; 26. Second sealing ring; 27. First channel; 28. Second channel; 29. ​​Shaft hole; 30. Connecting shaft; 31. Limiting ring; 32. Locking assembly; 33. Locking tumbler; 34. First return spring; 35. First screw plug; 36. Operating rod; 37. Guide hole; 38. Stroke limit hole; 39. Annular locking groove; 40. Linkage ring; 41. First annular conical groove; 42. Second annular conical groove; 43. First movable cavity; 44. First ball bearing; 45. Third annular conical groove; 46. Fourth annular conical groove; 47. Second movable cavity; 48. Second ball bearing; 49. Annular groove; 50. Movable partition; 51. Fixed partition; 52. Opening ring; 53. Third sealing ring; 54. Fourth sealing ring; 55. Fixed... 56. Positioning truncated cone; 57. Positioning groove; 58. Bushing; 59. First internal hexagonal nut; 60. Second internal hexagonal nut; 61. Oil injection hole; 62. Second screw plug; 63. Limiting boss; 64. Throttling rod; 65. Adjusting ring; 66. Locking nut; 67. Second return spring; 68. Sliding cavity; 69. Guide flange; 70. Throttling seal ring; 71. Limiting pressure ring; 72. Throttling hole; 73. Arc-shaped hole. Detailed Implementation

[0029] 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 some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Example: As attached Figures 1-12The illustrated wear-resistant gate valve for mining combustible ice hydrate with an erosion-resistant tungsten carbide coating includes a valve body 1, a valve cover 2, an actuator 3, a valve stem 4, and a gate 5. The valve cover 2 is mounted on the upper end of the valve body 1, and a bracket 6 is provided on the valve cover 2. The actuator 3 is mounted on the bracket 6 and can be a pneumatic actuator 3 or an electric actuator 3. One end of the valve stem 4 is connected to the output end of the actuator 3, and the other end of the valve stem 4 extends into the valve body 1 and is linked to the gate 5. The valve body 1 has an inlet flow channel 7 and an outlet flow channel 8. A valve seat 9 is provided at the inner end of the inlet flow channel 7, and the two can be one. The valve body has a three-dimensional structure. When the valve is closed, one end of the gate 5 abuts against the valve seat 9, and the other end of the gate 5 abuts against the inner end of the outlet flow channel 8. The gate 5 includes a gate base 10 connected to the lower end of the valve stem 4, a sealing disc 11 disposed on the gate base 10, and a drive mechanism 12 that can drive the sealing disc 11 to rotate around the central axis of the gate base 10. The sealing surface of the sealing disc 11 and the sealing surface of the valve seat 9 are both provided with a tungsten carbide coating 13. The bottom of the inner cavity of the valve body 1 is provided with a trigger mechanism 14 that, when the gate 5 moves downward, forms a linkage with the drive mechanism 12 and drives the sealing disc 11 to rotate. When the gate 5 is closed, the triggering mechanism 14 triggers the drive mechanism 12 to work, causing the sealing disc 11 to rotate and remove ice crystals from the sealing surface. The rotation is triggered by the valve closing action itself, and no additional energy is required to scrape off the attached ice crystals during the closing process, ensuring the sealing surface is clean and guaranteeing reliable valve opening and closing. In addition, the sealing disc 11 and the sealing surface of the valve seat 9 are coated with tungsten carbide 13, which can enhance wear resistance and corrosion resistance, extend the service life of the valve, and is suitable for the mining of combustible ice hydrate.

[0031] As attached Figures 2-6As shown, the drive mechanism 12 includes a drive piston 15 and an energy storage piston 16. A first variable cavity 17 and a second variable cavity 18 are provided between the sealing disc 11 and the gate base 10. A drive cavity 19 is provided at the lower end of the gate base 10. The drive piston 15 is axially movable in the drive cavity 19, and a first sealing ring 20 is installed on the outer circular surface of the drive piston 15 to form a sealing fit with the inner circular surface of the drive cavity 19. A linkage rod 21 is provided at the lower end of the drive piston 15. The linkage rod 21 extends out of the drive cavity 19 to cooperate with the trigger mechanism 14. A first drive spring 22 and a second drive spring 23 are also provided in the drive cavity 19 to apply a downward force to the drive piston 15. The two springs are concentrically arranged, and the specification of the outer spring is larger than that of the inner spring. An energy storage cavity 24 is provided on the sealing disc 11, and the energy storage piston 16 is axially movable in the energy storage cavity 24. The energy storage cavity 24 is provided with a force for the energy storage piston. A storage spring 25 applies an inward force to the energy storage piston 16, and a second sealing ring 26 is installed on the outer circular surface of the energy storage piston 16 to form a sealing fit with the inner circular surface of the energy storage cavity 24. A first channel 27 is provided on the gate base 10 to connect the drive cavity 19 and the first variable cavity 17. A second channel 28 is provided on the sealing disc 11 to connect the energy storage cavity 24 and the second variable cavity 18. The drive cavity 19, the first channel 27, the first variable cavity 17, the second variable cavity 18, the second channel 28, and the energy storage cavity 24 are filled with driving oil. When the drive piston 15 moves axially, the volume of the first variable cavity 17 and the second variable cavity 18 changes, causing the sealing disc 11 to rotate relative to the gate body 5. That is, when the drive piston 15 moves upward, the energy storage piston 16 moves outward under hydraulic pressure. When the drive piston 15 is reset downward by the spring force, the pressure in the energy storage cavity 24 is released, and the energy storage piston 16 is also reset inward by the spring force. The linear motion of the gate 5 during its downward movement is converted into the rotational motion of the sealing disc 11 by a hydraulic drive mechanism. When the gate 5 descends to the bottom, the trigger mechanism 14 can directly push the linkage rod 21, triggering the drive piston 15 to move upward. The change in the volume of the drive chamber 19 transmits pressure through the drive oil, causing a change in the volume of the first variable chamber 17 and the second variable chamber 18, thereby driving the sealing disc 11 to rotate relative to the main body of the gate 5. When the gate 5 moves upward, the two pistons are reset by the spring, and the volumes of the first variable chamber 17 and the second variable chamber 18 change again, thereby driving the sealing disc 11 to rotate in the opposite direction relative to the main body of the gate 5. This achieves automatic cleaning of the sealing surface, effectively removes the attached ice crystals, ensures the complete sealing of the valve, and avoids the risk of combustible ice decomposition that may be caused by the preheating method.

[0032] As attached Figure 2As shown, a shaft hole 29 is provided at the center of the gate base 10. A connecting shaft 30 is provided on the side of the sealing disc 11 near the gate base 10. The connecting shaft 30 extends through the shaft hole 29 to the other side of the gate base 10. A limiting ring 31 for axially limiting the connecting shaft 30 is detachably installed on the connecting shaft 30. This design ensures that the sealing disc 11 can rotate relative to the gate base 10 without axial displacement, the connection structure is stable and reliable, and the detachable structure of the limiting ring 31 ensures that the sealing disc 11 and the gate base 10 can be disassembled, which is beneficial for initial assembly and subsequent disassembly and maintenance.

[0033] As attached Figures 7-9 As shown, the limiting ring 31 is sleeved on the outer periphery of the connecting shaft 30. A locking assembly 32 is provided on the limiting ring 31. The locking assembly 32 includes a locking tumbler 33, a first return spring 34, a first screw plug 35, and an operating rod 36. A guide hole 37 is radially through the outer circumference of the limiting ring 31. A travel limiting hole 38 communicating with the guide hole 37 is opened on the end face of the limiting ring 31 away from the gate base 10. The width of the travel limiting hole 38 is approximately equal to the outer diameter of the operating rod 36. The locking tumbler 33 is axially movable within the guide hole 37. The first screw plug 35 is threadedly connected to the guide hole 37. The outer end, i.e. the outer end of the guide hole 37, has a threaded groove. The first return spring 34 is clamped between the first screw plug 35 and the locking ball 33. The operating rod 36 passes through the travel limiting hole 38 and is threadedly connected to the locking ball 33. That is, the outer circumference of the operating rod 36 has a threaded part. The side of the locking ball 33 has a screw hole for the threaded part of the operating rod 36 to be screwed in. The outer circular surface of the connecting shaft 30 is provided with an annular locking groove 39. The width of the annular locking groove 39 is equivalent to the outer diameter of the locking ball 33. When the operating rod 36 drives the locking ball 33 to move axially, the inner end of the locking ball 33 is inserted into or disengaged from the annular locking groove 39. The specific design of the detachable structure of the limiting ring 31 is as follows: after the first return spring 34 presses the inner end of the locking tumbler 33 into the annular locking groove 39 of the connecting shaft 30, the limiting ring 31 and the connecting shaft 30 can be locked. By moving the operating lever 36, the spring force of the first return spring 34 is overcome, and the locking tumbler 33 is driven to disengage from the annular locking groove 39 of the connecting shaft 30, thereby unlocking the limiting ring 31 and the connecting shaft 30. The operation is very convenient.

[0034] As attached Figure 2As shown, the connecting shaft 30 is keyed to a linkage ring 40 on its outer periphery. The linkage ring 40 is sandwiched between the limiting ring 31 and the gate base 10. The linkage ring 40 has a first annular conical groove 41 on the side near the gate base 10, and the gate base 10 has a second annular conical groove 42 on the side near the linkage ring 40. The first annular conical groove 41 and the second annular conical groove 42 combine to form a first movable cavity 43. A plurality of first balls 44 are rolled in the first movable cavity 43. The sealing disc 11 has a third annular conical groove 45 on the side near the gate 5 body, and the gate base 10 has a fourth annular conical groove 46 on the side near the sealing disc 11. The third annular conical groove 45 and the fourth annular conical groove 46 combine to form a second movable cavity 47. A plurality of second balls 48 are rolled in the second movable cavity 47. The original surface contact friction between the sealing disc 11 and the gate plate base 10 is transformed into point contact rolling friction, which not only reduces the rotation starting torque, but also effectively reduces the frictional resistance of the sealing disc 11 during rotation, ensuring smooth rotation to remove ice crystals even under low temperature conditions.

[0035] As attached Figure 2 , 5 As shown in Figure 6, the sealing disc 11 has an annular groove 49 at a position corresponding to the outer periphery of the connecting shaft 30. A movable partition 50 is provided in the annular groove 49. One end of the movable partition 50 is integrally connected to the inner circular surface of the annular groove 49, and the other end of the fixed partition 51 is tightly fitted to the outer circular surface of the connecting shaft 30. The gate base 10 has a fixed partition 51 extending into the annular groove 49. The fixed partition 51 and the movable partition 50 divide the annular groove 49 into the first variable cavity 17 and the second variable cavity 18. The outer periphery of the movable partition 50 can be covered with a silicone layer to prevent oil from flowing between the first variable cavity 17 and the second variable cavity 18. The fixed partition 51 has an open ring 52 at its inner end for fitting around the outer circumference of the connecting shaft 30. When the sealing disc 11 rotates, the inner end of the movable partition 50 is movably positioned within the opening of the open ring 52 in an arc trajectory. That is, when the movable partition 50 abuts against the two ends of the opening of the open ring 52, it forms a travel limit in the clockwise direction and a travel limit in the counterclockwise direction. A third sealing ring 53 is installed on the outer circumference of the connecting shaft 30 to form a sealing fit with the inner circumference of the shaft hole 29. A fourth sealing ring 54 is installed on the outer periphery of the sealing disc 11 corresponding to the annular groove 49 to form a sealing fit with the end face of the gate base 10. The movable partition 50 is a force-bearing movable part. When the pressure in the first variable cavity 17 increases, the driving oil pushes the movable partition 50 to rotate, thereby driving the sealing disc 11 to rotate. When the pressure in the second variable cavity 18 increases, the driving oil pushes the movable partition 50 to rotate in the opposite direction, thereby driving the sealing disc 11 to rotate in reverse.

[0036] As attached Figure 2As shown, the sealing disc 11 has a positioning frustum 55 on the side near the gate base 10. The connecting shaft 30, the annular groove 49, and the third annular conical groove 45 are all located on the positioning frustum 55. The gate base 10 has a positioning groove 56 that mates with the positioning frustum 55. A bushing 57 is provided between the inner surface of the positioning groove 56 and the outer surface of the positioning frustum 55. This design not only improves the installation accuracy of the sealing disc 11 on the gate base 10, but also, through the bushing 57 provided between the inner surface of the positioning groove 56 and the outer surface of the positioning frustum 55, which is made of wear-resistant material, it can isolate direct metal contact, thus adapting to thermal expansion and contraction deformation in low-temperature environments to prevent jamming, and ensuring smooth rotation of the sealing disc 11 through its low-friction characteristics.

[0037] As attached Figure 3 and attached Figure 4 As shown, the gate base 10 is threadedly connected to a first hexagonal socket limiting nut 58 at the outer end of the drive chamber 19, which limits the lower stroke of the drive piston 15. The linkage rod 21 passes through the first hexagonal socket limiting nut 58. The sealing disc 11 is threadedly connected to a second hexagonal socket limiting nut 59 at the outer end of the energy storage chamber 24. The two ends of the energy storage spring 25 abut against the second hexagonal socket limiting nut 59 and the energy storage piston 16, respectively. By setting the first hexagonal socket limiting nut 58 and the second hexagonal socket limiting nut 59, the extreme strokes of the drive piston 15 and the energy storage piston 16 are precisely limited, ensuring that the piston movement is within a safe range during valve operation and avoiding malfunctions caused by excessive displacement.

[0038] As attached Figure 2 As shown, the gate base 10 has an oil injection hole 60 on the side away from the sealing disc 11, which communicates with the drive cavity 19. The outer end of the oil injection hole 60 is threadedly connected to a second screw plug 61, that is, the outer end of the oil injection hole 60 has a threaded groove, and a sealing element is provided between the inner end of the threaded groove and the second screw plug 61 to strengthen the seal. The direct communication design between the oil injection hole 60 and the drive cavity 19 ensures that the drive oil can flow into the drive cavity 19 without obstruction. The oil injection hole 60 is located on the side of the gate base 10 away from the sealing disc 11. This position avoids the complex area of ​​the sealing disc 11 rotation mechanism and the valve cavity flow channel, allowing external operators to directly contact the oil injection point without interfering with the internal moving parts.

[0039] As attached Figures 10-12As shown, the valve body 1 has a limiting boss 62 at its bottom for limiting the gate 5. The triggering mechanism 14 is disposed on the limiting boss 62. The triggering mechanism 14 includes a throttle rod 63, an adjusting ring 64, a locking nut 65, and a second return spring 66. The upper end of the limiting boss 62 has a sliding cavity 67. The throttle rod 63 is vertically movably disposed in the sliding cavity 67. The middle part of the throttle rod 63 has a guide flange 68. The outer circular surface of the guide flange 68 has a throttle sealing ring 69 for forming a sealing fit with the inner circular surface of the sliding cavity 67. A limiting ring 70 is threaded onto the boss 62 to limit the upper stroke of the guide flange 68. The upper end of the throttle rod 63 passes through the limiting ring 70 to cooperate with the drive piston 15. Multiple throttle holes 71 are provided through the guide flange 68, and the multiple throttle holes 71 are evenly distributed in an arc trajectory. The locking nut 65 is threaded onto the throttle rod 63 and presses the adjusting ring 64 against the lower end of the guide flange 68. An arc-shaped hole 72 is provided on the throttle rod 63. When the adjusting ring 64 rotates, the arc-shaped hole 72 communicates with one or more throttle holes 71. The limiting boss 62 serves as a basic support component, limiting the end position of the lower stroke of the gate 5 and providing a stable mounting platform for the triggering mechanism 14, ensuring that the gate 5 moves accurately to the closed position. The triggering mechanism 14 adopts the principle of vibration damper. When the gate 5 moves downward, it slowly applies an upward thrust to the drive mechanism 12 on the gate 5 (the throttle rod 63 moves downward slowly during the application of the thrust). The guide flange 68 of the throttle rod 63 is designed with multiple throttle holes 71, which are used in conjunction with the adjusting ring 64. That is, the arc-shaped hole 72 is connected with different numbers of throttle holes 71, thereby adjusting the damping force of the triggering mechanism 14 in a stepwise manner. This allows the drive piston 15 to move stably relative to the gate base 10 and not to move upward suddenly and abruptly, thus protecting the gate 5 components and significantly improving the service life of the valve.

Claims

1. A kind of anti-erosion tungsten carbide coating combustible ice hydrate exploitation wear-resistant gate valve, including valve body (1), valve cover (2), executor (3), valve stem (4) and gate plate (5), the valve cover (2) is installed on the upper end of valve body (1), the bracket (6) is equipped on the valve cover (2), the executor (3) is installed on the bracket (6), one end of the valve stem (4) is connected with the output end of executor (3), the other end of the valve stem (4) is connected with gate plate (5) linkage in the inside of valve body (1), the inlet flow channel (7) and outlet flow channel (8) are equipped in the valve body (1), the inner end of the inlet flow channel (7) is equipped with valve seat (9), when the valve is closed, one end of the gate plate (5) is tightly abutted with valve seat (9), the other end of gate plate (5) is tightly abutted with the inner end of outlet flow channel (8);Its characterized in that: The gate plate (5) comprises a gate plate base body (10), a sealing disc (11) arranged on the gate plate base body (10), and a driving mechanism (12) capable of driving the sealing disc (11) to rotate around the axis of the gate plate base body (10), a tungsten carbide coating (13) is arranged on the sealing surface of the sealing disc (11) and the sealing surface of the valve seat (9), and the bottom of the inner cavity of the valve body (1) is provided with a trigger mechanism (14) linked with the driving mechanism (12) when the gate plate (5) goes down and driving the sealing disc (11) to rotate.

2. An erosion resistant tungsten carbide coated, abrasion resistant gate valve for the production of combustible ice hydrates according to claim 1, characterized in that: The driving mechanism (12) comprises a driving piston (15) and an energy storage piston (16), a first variable cavity (17) and a second variable cavity (18) are arranged between the sealing disc (11) and the gate plate base body (10), the lower end of the gate plate base body (10) is provided with a driving cavity (19), the driving piston (15) is arranged in the driving cavity (19) and can move axially, a first sealing ring (20) is arranged on the outer circular surface of the driving piston (15) and is used to seal with the inner circular surface of the driving cavity (19), the lower end of the driving piston (15) is provided with a linkage rod (21) which extends out of the driving cavity (19) and is used to cooperate with the trigger mechanism (14), the driving cavity (19) is further provided with a first driving spring (22) and a second driving spring (23) which apply downward force to the driving piston (15), the sealing disc (11) is provided with an energy storage cavity (24), the energy storage piston (16) is arranged in the energy storage cavity (24) and can move axially, the energy storage cavity (24) is provided with an energy storage spring (25) which applies inward force to the energy storage piston (16), and a second sealing ring (26) is arranged on the outer circular surface of the energy storage piston (16) and is used to seal with the inner circular surface of the energy storage cavity (24), the gate plate base body (10) is provided with a first channel (27) which connects the driving cavity (19) and the first variable cavity (17), the sealing disc (11) is provided with a second channel (28) which connects the energy storage cavity (24) and the second variable cavity (18), the driving cavity (19), the first channel (27), the first variable cavity (17), the second variable cavity (18), the second channel (28) and the energy storage cavity (24) are filled with driving oil, when the driving piston (15) moves axially, the volume of the first variable cavity (17) and the second variable cavity (18) changes, so that the sealing disc (11) rotates relative to the gate plate (5) body.

3. An erosion resistant tungsten carbide coated, abrasion resistant gate valve for the production of combustible ice hydrates according to claim 2, characterized in that: The center of the gate plate base body (10) is provided with a shaft hole (29), the side of the sealing disc (11) close to the gate plate base body (10) is provided with a connecting shaft (30), the connecting shaft (30) extends to the other side of the gate plate base body (10) through the shaft hole (29), and a limiting ring (31) which limits the axial position of the connecting shaft (30) is detachably arranged on the connecting shaft (30).

4. An erosion resistant tungsten carbide coated, abrasion resistant gate valve for the production of combustible ice hydrates according to claim 3, characterized in that: The limiting ring (31) is sleeved on the outer periphery of the connecting shaft (30), and the limiting ring (31) is provided with a locking assembly (32), the locking assembly (32) comprises a locking pin (33), a first reset spring (34), a first screw (35) and an operating rod (36), a guide hole (37) is provided on the outer circular surface of the limiting ring (31) in the radial direction, a stroke limiting hole (38) is formed in the end surface of the limiting ring (31) away from the gate plate base body (10), the locking pin (33) is movably arranged in the guide hole (37) in the axial direction, the first screw (35) is threadedly connected to the outer end of the guide hole (37), the first reset spring (34) is clamped between the first screw (35) and the locking pin (33), the operating rod (36) is threadedly connected with the locking pin (33) through the stroke limiting hole (38), and the outer circular surface of the connecting shaft (30) is provided with an annular locking groove (39), when the operating rod (36) drives the locking pin (33) to move axially, the inner end of the locking pin (33) is inserted into or separated from the annular locking groove (39).

5. An erosion resistant tungsten carbide coated, abrasion resistant gate valve for the production of combustible ice hydrates according to claim 3, characterized in that: The outer periphery of the connecting shaft (30) is connected with a linkage ring (40), the linkage ring (40) is clamped between the limiting ring (31) and the gate plate base body (10), one side of the linkage ring (40) close to the gate plate base body (10) is provided with a first annular taper groove (41), one side of the gate plate base body (10) close to the linkage ring (40) is provided with a second annular taper groove (42), the first annular taper groove (41) and the second annular taper groove (42) are combined to form a first movable cavity (43), a plurality of first balls (44) are arranged in the first movable cavity (43) and roll, one side of the sealing disc (11) close to the gate plate (5) body is provided with a third annular taper groove (45), one side of the gate plate base body (10) close to the sealing disc (11) is provided with a fourth annular taper groove (46), the third annular taper groove (45) and the fourth annular taper groove (46) are combined to form a second movable cavity (47), and a plurality of second balls (48) are arranged in the second movable cavity (47) and roll.

6. An erosion resistant tungsten carbide coated, abrasion resistant gate valve for the production of combustible ice hydrates according to claim 3, characterized in that: The sealing disc (11) has an annular groove (49) at the position corresponding to the outer periphery of the connecting shaft (30). A movable partition (50) is provided in the annular groove (49). One end of the movable partition (50) is integrally connected to the inner circular surface of the annular groove (49), and the other end of the fixed partition (51) is tightly fitted to the outer circular surface of the connecting shaft (30). The gate base (10) is provided with a fixed partition (51) extending into the annular groove (49). The fixed partition (51) and the movable partition (50) divide the annular groove (49) into the first variable cavity (17) and the second variable cavity (2). The variable cavity (18) has an open ring (52) at the inner end of the fixed partition (51) for fitting around the outer circumference of the connecting shaft (30). When the sealing disc (11) rotates, the inner end of the movable partition (50) is moved in an arc trajectory within the opening of the open ring (52). A third sealing ring (53) is installed on the outer circular surface of the connecting shaft (30) for forming a sealing fit with the inner circular surface of the shaft hole (29). A fourth sealing ring (54) is installed on the outer periphery of the sealing disc (11) corresponding to the annular groove (49) for forming a sealing fit with the end face of the gate base (10).

7. An erosion resistant tungsten carbide coated, abrasion resistant gate valve for the production of combustible ice hydrates according to claim 6, characterized in that: The sealing disc (11) has a positioning frustum (55) on the side near the gate base (10). The connecting shaft (30), the annular groove (49) and the third annular conical groove (45) are all located on the positioning frustum (55). The gate base (10) has a positioning groove (56) that mates with the positioning frustum (55). A bushing (57) is provided between the inner surface of the positioning groove (56) and the outer surface of the positioning frustum (55).

8. An erosion resistant tungsten carbide coated, abrasion resistant gate valve for the production of combustible ice hydrates according to claim 2, characterized in that: The gate base (10) is threaded with a first internal hexagonal nut (58) at the position corresponding to the outer end of the drive cavity (19) to limit the lower stroke of the drive piston (15), and the linkage rod (21) passes through the first internal hexagonal nut (58); the sealing disc (11) is threaded with a second internal hexagonal nut (59) at the position corresponding to the outer end of the energy storage cavity (24), and the two ends of the energy storage spring (25) abut against the second internal hexagonal nut (59) and the energy storage piston (16) respectively.

9. An erosion resistant tungsten carbide coated, abrasion resistant gate valve for the production of combustible ice hydrates according to claim 2, characterized in that: The gate base (10) has an oil injection hole (60) on the side away from the sealing disc (11) that communicates with the drive cavity (19), and the outer end of the oil injection hole (60) is threaded with a second plug (61).

10. The erosion resistant tungsten carbide coated, abrasion resistant gate valve for the extraction of combustible ice hydrates of claim 2, wherein: The valve body (1) has a limiting boss (62) at its bottom for limiting the gate (5) to move downwards. The triggering mechanism (14) is mounted on the limiting boss (62). The triggering mechanism (14) includes a throttle rod (63), an adjusting ring (64), a locking nut (65), and a second return spring (66). The upper end of the limiting boss (62) has a sliding cavity (67). The throttle rod (63) is vertically movably mounted in the sliding cavity (67). The middle part of the throttle rod (63) has a guide flange (68). The outer surface of the guide flange (68) has a throttle sealing ring (69) for sealing with the inner surface of the sliding cavity (67). The boss (62) is threaded with a limiting pressure ring (70) for limiting the upper stroke of the guide flange (68). The upper end of the throttle rod (63) passes through the limiting pressure ring (70) to cooperate with the drive piston (15). The guide flange (68) is provided with multiple throttle holes (71) that are evenly distributed in an arc trajectory. The locking nut (65) is threaded onto the throttle rod (63) and presses the adjusting ring (64) against the lower end of the guide flange (68). The throttle rod (63) is provided with an arc-shaped hole (72). When the adjusting ring (64) rotates, the arc-shaped hole (72) communicates with one or more throttle holes (71).

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