Electrically powered flat gate valve

Abstract

The application discloses an electric flat gate valve, which comprises a valve body, a valve cover, a support, an electric actuator, a valve rod and a gate plate, the gate plate is provided with a flow hole, the valve body is provided with a valve seat corresponding to the both sides of the gate plate, the lower end of the valve rod is provided with a connecting head, the lower end of the connecting head is provided with a T-shaped groove, the upper end of the gate plate is provided with a T-shaped rod matched with the T-shaped groove, the T-shaped rod can move vertically in the T-shaped groove for a certain distance, the inner wall of the valve body is coaxially provided with a first installation groove and a second installation groove, the first installation groove is provided with a fixing ring, the valve seat is slidably arranged in the second installation groove, the fixing ring is provided with a linkage mechanism linked with the valve seat, when the gate plate abuts against the bottom of the valve body and the connecting head moves downward or upward relative to the gate plate, the connecting head is matched with the linkage mechanism, the linkage mechanism drives the valve seat to move towards the gate plate or away from the gate plate. In the opening and closing process, the valve seat and the gate plate have no friction, and the service life of the valve can be remarkably prolonged.

Description

Technical Field

[0001] This invention relates to the field of valve technology, and in particular to an electric flat gate valve. Background Technology

[0002] An electric flat gate valve includes a valve body, a valve cover, a valve seat, a gate, a valve stem, and an electric actuator. The valve cover is installed on the outside of the valve body, and the valve seat and gate are installed inside. The valve seat is distributed on both sides of the gate and is located between the gate and the valve body. The valve stem is located inside the valve cover and extends into the valve body to connect with the gate. The electric actuator is installed on the valve cover and its output end is connected to the valve stem. The electric actuator can drive the gate to move up and down perpendicular to the water flow direction through the valve stem, thereby realizing the opening and closing of the water flow channel inside the valve body.

[0003] An electric sand-proof flat gate valve, as disclosed in Chinese invention patent application CN202310543674.5, includes: a valve body with a flow cavity inside; a valve stem, the upper end of which is driven by a motor to move linearly, and the lower end extending into the flow cavity; the flow cavity also contains an outer valve seat and an inner valve seat, with two outer valve seats symmetrically arranged on both sides of the valve stem and embedded in the inner wall of the valve body; two inner valve seats symmetrically arranged on both sides of the valve stem and embedded in the inner side of the outer valve seats; and sand-proof rings are provided on the contact surfaces of the outer and inner valve seats. A through hole is formed in the lower half of the valve stem. When the gate needs to be closed, the valve stem is driven downward until the through hole and the inner valve seats are misaligned; when the gate needs to be opened, the valve stem is driven upward until the through hole and the inner valve seats coincide. During the valve opening and closing process, the lower half of the valve stem is always in frictional contact with the two valve seats, which will lead to severe wear of the valve seats and a significant reduction in service life. Therefore, it is necessary to improve this structure. Summary of the Invention

[0004] The purpose of this invention is to provide an electric flat gate valve. During the opening and closing process, there is no friction between the valve seat and the gate, which can not only significantly improve the service life of the valve, but also provide a very reliable sealing performance.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an electric flat gate valve, comprising a valve body, a central cavity disposed within the valve body, flow channels disposed at both ends of the valve body and communicating with the central cavity, a valve cover mounted on the upper end of the valve body, a bracket mounted on the valve cover, an electric actuator mounted on the bracket, a valve stem passing through the valve cover and having its upper end connected to the output end of the electric actuator, and a gate plate disposed within the central cavity. The gate plate has flow holes, and a valve seat is installed at the inner end of each of the two flow channels. A connector is provided at the lower end of the valve stem, and a T-shaped groove is provided at the lower end of the connector. The upper end of the gate plate is provided with a T-shaped rod that mates with the T-shaped groove, and the T-shaped rod can move vertically a certain distance in the T-shaped groove; the inner wall of the valve body is coaxially provided with a first mounting groove and a second mounting groove, a fixing ring is installed on the first mounting groove, the valve seat is slidably disposed in the second mounting groove, and a linkage mechanism that is linked with the valve seat is installed on the fixing ring; when the gate plate abuts against the bottom of the valve body, and the connector moves downward or upward relative to the gate plate, the connector and the linkage mechanism cooperate to cause the linkage mechanism to drive the valve seat to move toward or away from the gate plate.

[0006] By adopting the above technical solution, there is no friction between the valve seat and the gate during the valve opening and closing process. That is, when the gate moves to the closed position, the valve stem can still move down or up a certain distance relative to the gate. The connector on the valve stem cooperates with the linkage mechanism, which drives the valve seat to move closer to or away from the gate. When the valve seat and the gate cooperate, there is only a positive pressure perpendicular to the gate, and no frictional force parallel to the gate surface. Therefore, it can significantly improve the service life of the valve.

[0007] The invention is further configured such that the linkage mechanism includes a movable shaft, a first spring, a telescopic trigger assembly, a connecting rod, and multiple second springs. A shaft hole is formed on the fixed ring perpendicular to the gate plate direction. The movable shaft is axially movably disposed within the shaft hole. An annular groove is formed on the outer circular surface of the movable shaft. A tapered transmission surface is provided on the side of the annular groove near the gate plate. The telescopic trigger assembly is mounted on the fixed ring, and its lower end abuts against the tapered transmission surface. When the connecting head pushes the telescopic trigger assembly downwards, the telescopic trigger assembly drives the movable shaft to move towards the gate plate. The first spring applies a force to the movable shaft in a direction away from the gate plate. The valve seat is connected to the movable shaft via a connecting rod. A strip-shaped hole for the connecting rod to pass through is formed on the inner circular surface of the fixed ring. An inwardly extending limiting flange is also provided on the inner circular surface of the fixed ring. Multiple spring grooves, corresponding in number to the number of second springs, are formed on the limiting flange. The second springs are embedded in the corresponding spring grooves, and their outer ends abut against the valve seat, applying a force away from the gate plate.

[0008] By adopting the above technical solution, when the connector head is pressed down on the telescopic trigger assembly, the telescopic trigger assembly moves downward, causing the movable shaft to move towards the gate. The movable shaft drives the valve seat to move towards the gate through the connecting rod, thereby achieving valve closure and sealing. When the connector head moves upward, the first spring causes the movable shaft to reset, and the movable shaft drives the telescopic trigger assembly to reset. Under the combined action of the second spring and the movable shaft, the valve seat moves away from the gate.

[0009] The invention is further configured such that the telescopic trigger assembly includes a trigger rod, a steel ball, a third spring, and an internal hexagonal nut. The upper end of the fixing ring is provided with an upper threaded groove, a middle hole, and a lower hole with decreasing inner diameters from top to bottom. The trigger rod passes through the upper threaded groove, the middle hole, and the lower hole from top to bottom. A guide flange is provided on the outer periphery of the trigger rod, and the outer circular surface of the guide flange fits against the inner circular surface of the middle hole. The third spring is clamped between the guide flange and the inner end of the middle hole to apply an upward force to the trigger rod. The internal hexagonal nut is threaded into the upper threaded groove and is sleeved on the outer periphery of the trigger rod to limit the upper stroke of the guide flange. The steel ball is rolled between the lower end of the trigger rod and the tapered transmission surface of the movable shaft.

[0010] By adopting the above technical solution, the trigger rod on the telescopic trigger assembly is used to receive the pressure of the connector. The trigger rod can be self-reset by the third spring. When the trigger rod moves downward, it pushes the steel ball to cooperate with the conical transmission surface on the movable shaft. This cooperation method is a rolling cooperation with very low friction, which makes the transmission between the connector and the movable shaft more stable and reliable. Moreover, the low friction also reduces the required operating torque.

[0011] The invention is further configured such that a first threaded groove is provided at the outlet of the fixed ring corresponding to the shaft hole away from the gate plate, a first threaded sleeve is threadedly connected in the first threaded groove, the end of the movable shaft away from the gate plate extends out of the first threaded sleeve, and a screw part is provided at the end of the movable shaft away from the gate plate. A clearance groove is provided on the inner end face of the first mounting groove for the screw part to extend into, a limiting washer is sleeved on the outer periphery of the screw part, and a locking nut for pressing the limiting washer to the end of the movable shaft is threadedly connected on the screw part. The two ends of the first spring abut against the first threaded sleeve and the limiting washer, respectively.

[0012] By adopting the above technical solution, the first spring can be positioned and installed, and a directional spring force can be applied to the movable shaft. The installation structure is simple and reliable, and the spring force can be adjusted.

[0013] The invention is further configured such that a threaded hole is provided radially through the upper end of the valve seat, the lower end of the connecting rod is threaded into the threaded hole, a sealing plug is threaded into the lower end of the threaded hole, an annular linkage groove is provided on the outer circumference of the movable shaft, and the upper end of the connecting rod is inserted into the annular linkage groove.

[0014] By adopting the above technical solution, the linkage between the movable shaft and the valve seat can be realized, and the cooperation between the two ends of the connecting rod and the movable shaft and the valve seat is very simple, making disassembly and assembly very convenient.

[0015] The invention is further configured such that the linkage mechanism includes an annular sealing seat and a valve disc. The fixed ring, corresponding to the shaft hole near the gate, is provided with a second threaded groove and a fixing groove sequentially from the outside to the inside. A second threaded sleeve for pressing the valve disc into the fixing groove is threadedly connected to the second threaded groove. The valve disc is threadedly connected to the end of the movable shaft near the gate. The valve body is provided with a pressure relief channel connecting the clearance groove and the flow channel. The movable shaft has a shaft core hole extending axially. The valve disc has a central confluence groove at the end near the movable shaft, which is connected to the shaft core hole. The outer surface of the valve disc has a radial hole communicating with the central confluence groove. The valve disc has a conical sealing surface for engaging with the annular sealing seat. When the valve seat abuts against the gate, the valve disc abuts against the annular sealing seat, disconnecting the flow channel from the central cavity. When the valve seat approaches or disengages from the gate, the valve disc moves away from the annular sealing seat, reconnecting the flow channel to the central cavity.

[0016] By adopting the above technical solution and adding a pressure relief structure, at the moment the valve opens, the middle cavity is connected to the front and rear flow channels through two pressure relief channels respectively, achieving the effect of flow diversion and avoiding the upstream medium pressure from being concentrated at the gate. This not only reduces the opening torque of the gate, but also reduces the scouring of the gate and valve seat sealing surfaces by the medium at the moment of opening, and also reduces the valve opening noise.

[0017] The present invention is further configured such that the diameter of the upper end of the connecting rod is smaller than the length of the annular linkage groove, an annular groove is provided on the outer circular surface of the valve seat, a damping ring is embedded in the annular groove, and the outer circular surface of the damping ring is in close contact with the inner circular surface of the second mounting groove.

[0018] By adopting the above technical solution, the effect of valve seat disengagement lag can be achieved. That is, by increasing the damping between the valve seat and the second mounting groove, when the valve is opened, the moving valve core drives the valve disc to disengage from the annular sealing seat, opening the middle cavity and the flow channel for pressure relief. Due to the damping cooperation between the valve seat and the second mounting groove, the movement speed of the valve seat away from the gate is less than the movement speed of the moving valve core away from the gate. Therefore, the effect of pressure relief first can be achieved, further reducing the valve opening torque and reducing the scouring of the gate and valve seat sealing surfaces by the medium at the moment of opening.

[0019] The present invention is further configured such that a mounting boss is provided on the inner wall of the valve body, the first mounting groove is formed on the mounting boss, a plurality of positioning grooves are formed on the end face of the mounting boss, a plurality of positioning protrusions that fit with the positioning grooves are provided on the outer circular surface of the fixing ring, a fixing sleeve is also threadedly connected to the outer circular surface of the mounting boss, and a pressing flange for pressing the positioning protrusions into the corresponding positioning grooves is provided on the inner circular surface of the fixing sleeve.

[0020] By adopting the above technical solution, the positioning and installation of the fixing ring can be achieved. The installation structure is simple, reliable, and has good stability.

[0021] The present invention is further configured such that an annular groove is provided at one end of the valve seat near the gate, and a sealing ring is embedded in the annular groove for forming a sealing fit when it abuts against the gate.

[0022] By adopting the above technical solution, the valve seat and gate are fitted with a soft seal, which provides better sealing performance under positive pressure. At the same time, the detachable design of the sealing ring makes it very convenient to replace the sealing ring after it ages.

[0023] The present invention is further configured such that a guide groove extending vertically is provided on the inner wall of the valve body at the position corresponding to the front and rear sides of the gate, and the front and rear sides of the gate are respectively slidably disposed in the corresponding guide grooves.

[0024] By adopting the above technical solution and setting a guide structure to guide the movement of the gate, the stability of the vertical movement of the gate can be improved. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the structure of the present invention, in which the fixing ring is connected to the valve seat through a linkage mechanism when the valve is fully closed; Figure 3 for Figure 2 A schematic diagram of the cooperation structure between the telescopic trigger component and the movable shaft core in the structure; Figure 4 This is a schematic diagram of the structure of the present invention, showing the connection between the retaining ring and the valve seat via a linkage mechanism at the moment the valve opens. Figure 5 for Figure 4 A schematic diagram of the cooperation structure between the telescopic trigger component and the movable shaft core in the structure; Figure 6 This is a schematic diagram of the mounting structure of the first spring of the present invention; Figure 7 This is a schematic diagram of the assembly structure of the movable shaft, valve disc, limiting washer, and locking nut of the present invention; Figure 8 for Figure 7 Exploded view of the structure.

[0026] In the diagram: 1. Valve body; 2. Middle cavity; 3. Flow channel; 4. Valve cover; 5. Bracket; 6. Electric actuator; 7. Valve stem; 8. Gate; 9. Flow hole; 10. Valve seat; 11. Connector; 12. T-shaped rod; 13. First mounting groove; 14. Second mounting groove; 15. Linkage mechanism; 16. Movable shaft; 17. First spring; 18. Telescopic trigger assembly; 19. Connecting rod; 20. Second spring; 21. Shaft hole; 22. Annular groove; 23. Conical transmission surface; 24. Strip hole; 25. Limiting flange; 26. Spring groove; 27. Trigger rod; 28. Steel ball; 29. ​​Third spring; 30. Hex socket nut; 31. Upper thread groove; 32. Middle hole; 33. Lower hole; 34. Guide convexity. 35. First threaded groove; 36. First threaded sleeve; 37. Threaded rod; 38. Relief groove; 39. Limiting washer; 40. Locking nut; 41. Threaded hole; 42. Sealing plug; 43. Annular linkage groove; 44. Annular sealing seat; 45. Valve disc; 46. Second threaded groove; 47. Fixing groove; 48. Pressure relief channel; 49. Shaft core hole; 50. Central manifold groove; 51. Radial hole; 52. Conical sealing surface; 53. Annular groove; 54. Damping ring; 55. Mounting boss; 56. Positioning groove; 57. Positioning protrusion; 58. Fixing sleeve; 59. Pressing flange; 60. Annular groove; 61. Sealing ring; 62. Guide groove; 63. T-groove; 64. Fixing ring; 65. Second threaded sleeve. Detailed Implementation

[0027] 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.

[0028] Example: As attached Figures 1-8The electric flat gate valve shown includes a valve body 1, a central cavity 2 disposed within the valve body 1, flow channels 3 disposed at both ends of the valve body 1 and communicating with the central cavity 2, a valve cover 4 mounted on the upper end of the valve body 1, a bracket 5 mounted on the valve cover 4, an electric actuator 6 (which may be a servo motor) mounted on the bracket 5, a valve stem 7 passing through the valve cover 4 and connected at its upper end to the output end of the electric actuator 6, and a gate 8 disposed within the central cavity 2. The gate 8 has flow holes 9, and a valve seat 10 is respectively installed at the inner end of the two flow channels 3, i.e., the two valve seats 10 are respectively disposed on both sides of the gate 8; the lower end of the valve stem 7 is provided with a connector 11, and the lower end of the connector 11 is provided with a T-shaped groove 63; the upper end of the gate 8 is provided with a T-shaped rod 12 that cooperates with the T-shaped groove 63, and the T-shaped rod 12 can move vertically a certain distance in the T-shaped groove 63, i.e., the height of the wider part of the upper end of the T-shaped groove 63 is greater than the height of the T-shaped groove 63. The height of the wider part at the upper end of the rod 12 is such that there is a certain gap between the two in terms of height matching. This gap is set between 2 and 5 mm according to actual needs. The inner wall of the valve body 1 is coaxially provided with a first mounting groove 13 and a second mounting groove 14. A fixing ring 64 is installed on the first mounting groove 13. The valve seat 10 is slidably disposed in the second mounting groove 14. Sealing rings 61 are provided between the outer circular surface of the fixing ring 64 and the inner circular surface of the first mounting groove 13, between the inner circular surface of the fixing ring 64 and the outer circular surface of the valve seat 10, and between the outer circular surface of the valve seat 10 and the inner circular surface of the second mounting groove 14. A linkage mechanism 15 that is linked with the valve seat 10 is installed on the fixing ring 64. When the gate 8 abuts against the bottom of the valve body 1 and the connector 11 moves downward or upward relative to the gate 8, the connector 11 cooperates with the linkage mechanism 15 to cause the linkage mechanism 15 to drive the valve seat 10 to move toward or away from the gate 8. During the valve opening and closing process, there is no friction between the valve seat 10 and the gate 8. That is, when the gate 8 moves to the closed position, the valve stem 7 can still move down or up a certain distance relative to the gate 8. The connector 11 on the valve stem 7 cooperates with the linkage mechanism 15. The linkage mechanism 15 drives the valve seat 10 to move closer to or away from the gate 8. When the valve seat 10 cooperates with the gate 8, there is only a positive pressure perpendicular to the gate 8, and no frictional force parallel to the surface of the gate 8. Therefore, it can significantly improve the service life of the valve.

[0029] As attached Figures 2-5As shown, the linkage mechanism 15 includes a movable shaft 16, a first spring 17, a telescopic trigger assembly 18, a connecting rod 19, and multiple second springs 20. A shaft hole 21 is formed on the fixed ring 64 perpendicular to the gate plate 8. The movable shaft 16 is axially movably disposed within the shaft hole 21, and the outer diameter of the movable shaft 16 is approximately equal to the inner diameter of the shaft hole 21. An annular groove 22 is formed on the outer circular surface of the movable shaft 16, and a tapered transmission surface 23 is provided on the side of the annular groove 22 near the gate plate 8. The telescopic trigger assembly 18 is mounted on the fixed ring 64, and its lower end abuts against the tapered transmission surface 23. When the connecting head 11 pushes the telescopic trigger assembly 18 downwards, the telescopic trigger assembly 18 drives the movable shaft 16 to move towards the gate plate 8. When the tapered transmission surface 23 on the movable shaft 16 is subjected to a vertical force, the horizontal component of this force on the movable shaft 16 will push the movable shaft 16 toward the direction closer to the gate plate 8. The first spring 17 applies a force to the movable shaft 16 toward the direction away from the gate plate 8. The valve seat 10 is connected to the movable shaft 16 through the connecting rod 19. The inner circular surface of the fixed ring 64 is provided with a strip hole 24 for the connecting rod 19 to pass through. The inner circular surface of the fixed ring 64 is also provided with an inwardly extending limiting flange 25. The limiting flange 25 is provided with a plurality of spring grooves 26, which are equal in number to the second spring 20. The second spring 20 is embedded in the corresponding spring groove 26, and the outer end of the second spring 20 abuts against the valve seat 10 and applies a force toward the direction away from the gate plate 8. When the connector 11 presses down on the telescopic trigger assembly 18, the telescopic trigger assembly 18 moves downward, causing the movable shaft 16 to move towards the gate 8. The movable shaft 16 drives the valve seat 10 to move towards the gate 8 through the connecting rod 19, thereby achieving valve closure and sealing. When the connector 11 moves upward, the first spring 17 causes the movable shaft 16 to reset, and the movable shaft drives the telescopic trigger assembly 18 to reset. Under the combined action of the second spring 20 and the movable shaft 16, the valve seat 10 moves away from the gate 8.

[0030] As attached Figures 2-5As shown, the telescopic trigger assembly 18 includes a trigger rod 27, a steel ball 28, a third spring 29, and an internal hexagonal nut 30. The upper end of the fixing ring 64 has an upper threaded groove 31, a middle hole 32, and a lower hole 33 with decreasing inner diameters from top to bottom. The trigger rod 27 passes through the upper threaded groove 31, the middle hole 32, and the lower hole 33 sequentially from top to bottom. The outer diameter of the trigger rod 27 is approximately equal to the inner diameter of the lower hole 33. A guide flange 34 is provided on the outer periphery of the trigger rod 27, and the outer surface of the guide flange 34 intersects with the middle hole 33. The inner circular surfaces of the two parts are in contact. The third spring 29 is clamped between the guide flange 34 and the inner end of the central hole 32 to apply an upward force to the trigger rod 27. The internal hexagonal nut 30 is threaded into the upper threaded groove 31 and is sleeved on the outer circumference of the trigger rod 27 to limit the upper stroke of the guide flange 34. The steel ball 28 is rolled between the lower end of the trigger rod 27 and the tapered transmission surface 23 of the movable shaft core 16. The depth of the annular groove 22 is not greater than the diameter of the steel ball 28. The trigger rod 27 on the telescopic trigger assembly 18 is used to receive the pressure of the connector 11. The trigger rod 27 can be self-reset by the third spring 29. When the trigger rod 27 moves downward, it pushes the steel ball 28 to cooperate with the tapered transmission surface 23 on the movable shaft core 16. This cooperation is a rolling cooperation with very low friction, which makes the transmission between the connector 11 and the movable shaft core 16 more stable and reliable. The low friction also reduces the required operating torque.

[0031] As attached Figure 6 As shown, the fixed ring 64 has a first threaded groove 35 at the outlet of the shaft hole 21 away from the gate plate 8. A first threaded sleeve 36 is threaded into the first threaded groove 35. The outer end of the first threaded sleeve 36 has an internal hexagonal groove. The end of the movable shaft core 16 away from the gate plate 8 extends out of the first threaded sleeve 36, and the end of the movable shaft core 16 away from the gate plate 8 has a screw part 37. The inner end face of the first mounting groove 13 has a relief groove 38 for the screw part 37 to extend into. A limiting washer 39 is sleeved on the outer periphery of the screw part 37. A locking nut 40 is also threaded onto the screw part 37 to press the limiting washer 39 against the end of the movable shaft core 16. The two ends of the first spring 17 abut against the first threaded sleeve 36 and the limiting washer 39, respectively. This design can realize the positioning and installation of the first spring 17, realize the application of directional spring force to the movable shaft core 16, the installation structure is simple and reliable, and the spring force can be adjusted.

[0032] As attached Figures 2-5As shown, a threaded hole 41 is radially provided on the upper end of the valve seat 10. The lower end of the connecting rod 19 is threaded into the threaded hole 41, meaning that the outer surface of the lower end of the connecting rod 19 has an external thread, and the lower end face of the connecting rod 19 has an internal hexagonal groove. A sealing plug 42 is threaded into the lower end of the threaded hole 41. The sealing plug 42 is made of silicone material and has an internal hexagonal groove on its outer end. An annular linkage groove 43 is provided on the outer surface of the movable shaft 16, and the upper end of the connecting rod 19 is inserted into the annular linkage groove 43. This design can realize the linkage between the movable shaft 16 and the valve seat 10, and the cooperation between the two ends of the connecting rod 19 and the movable shaft and the valve seat 10 is very simple, making disassembly and assembly very convenient.

[0033] As attached Figures 2-5 As shown, the linkage mechanism 15 also includes an annular sealing seat 44 and a valve disc 45. The fixing ring 64, corresponding to the shaft hole 21 near the gate plate 8, is provided with a second threaded groove 46 and a fixing groove 47 from the outside to the inside. A second threaded sleeve 65 for pressing the valve disc 45 into the fixing groove 47 is threadedly connected to the second threaded groove 46. The outer end of the second threaded sleeve 65 has an internal hexagonal groove. The valve disc 45 is threadedly connected to the end of the movable shaft core 16 near the gate plate 8, that is, the end of the movable shaft core 16 has a threaded groove. The outer surface of the valve disc 45 has an external thread that matches the threaded groove. At the same time, the outer periphery of the valve disc 45 has a hexagonal operating part, that is, the external thread is in the shape of a regular hexagon, so as to facilitate the rotation operation of the valve disc 45. A sealing element is provided between the valve disc 45 and the movable shaft core 16; the valve body 1 The valve disc 45 has a pressure relief channel 48 that connects the relief groove 38 to the flow channel 3. The movable shaft core 16 has a shaft core hole 49 that runs through it along the axial direction. The valve disc 45 has a central confluence groove 50 at one end near the movable shaft core 16. The central confluence groove 50 is connected to the shaft core hole 49. The outer circular surface of the valve disc 45 has a radial hole 51 that communicates with the central confluence groove 50. The valve disc 45 has a conical sealing surface 52 for cooperating with the annular sealing seat 44. When the valve seat 10 abuts against the gate plate 8, the valve disc 45 abuts against the annular sealing seat 44, disconnecting the flow channel 3 from the middle cavity 2. When the valve seat 10 approaches or disengages from the gate plate 8, the valve disc 45 moves away from the annular sealing seat 44, connecting the flow channel 3 to the middle cavity 2. By adding a pressure relief structure, at the moment the valve opens, the middle cavity 2 is connected to the front and rear flow channels 3 through two pressure relief channels 48 respectively, achieving the effect of flow diversion and avoiding the upstream medium pressure from being concentrated at the gate 8. This not only reduces the opening operation torque of the gate 8, but also reduces the scouring of the sealing surfaces of the gate 8 and valve seat 10 by the medium at the moment of opening, and also reduces the valve opening noise.

[0034] As attached Figures 2-5As shown, the diameter of the upper end of the connecting rod 19 is smaller than the length of the annular linkage groove 43. An annular groove 53 is provided on the outer circular surface of the valve seat 10. A damping ring 54 is embedded in the annular groove 53. The damping ring 54 can be made of silicone or rubber. The outer circular surface of the damping ring 54 is tightly fitted with the inner circular surface of the second mounting groove 14 to form damping. This design can achieve the effect of valve seat 10 disengaging after lag. That is, by increasing the damping between the valve seat 10 and the second mounting groove 14, when the valve is opened, the movable valve core drives the valve disc 45 to disengage from the annular sealing seat 44, connecting the middle cavity 2 and the flow channel 3 to release pressure. Due to the damping cooperation between the valve seat 10 and the second mounting groove 14, the movement speed of the valve seat 10 away from the gate plate 8 is less than the movement speed of the movable valve core away from the gate plate 8. Therefore, the effect of pressure release first can be achieved, further reducing the valve opening torque, and at the same time reducing the scouring of the gate plate 8 and the sealing surface of the valve seat 10 by the medium at the moment of opening.

[0035] As attached Figures 2-5 As shown, the valve body 1 has a mounting boss 55 on its inner wall, and the first mounting groove 13 is formed on the mounting boss 55. Multiple positioning grooves 56 are formed on the end face of the mounting boss 55. Multiple positioning protrusions 57 that fit into the positioning grooves 56 are formed on the outer surface of the fixing ring 64. A fixing sleeve 58 is also threaded onto the outer surface of the mounting boss 55. That is, the outer surface of the mounting boss 55 has external threads, and the inner surface of the fixing sleeve 58 has internal threads that mate with the outer surface. The inner surface of the fixing sleeve 58 has a pressing flange 59 for pressing the positioning protrusions 57 into the corresponding positioning grooves 56. This design enables the positioning and installation of the fixing ring 64, and the installation structure is simple, reliable, and stable.

[0036] As attached Figures 2-5 As shown, the valve seat 10 has an annular groove 60 at one end near the gate 8. A sealing ring 61 is embedded in the annular groove 60 to form a sealing fit when it abuts against the gate 8. The sealing ring 61 can be made of polytetrafluoroethylene. The valve seat 10 and the gate 8 adopt a soft sealing fit, which provides better sealing performance under positive pressure. At the same time, the detachable design of the sealing ring 61 makes it very convenient to replace after the sealing ring 61 ages.

[0037] In addition, as attached Figure 1 As shown, the inner wall of the valve body 1 is provided with a vertically extending guide groove 62 at the positions corresponding to the front and rear sides of the gate plate 8. The front and rear sides of the gate plate 8 are respectively slidably disposed in the corresponding guide groove 62. Two pairs of parallel guide ribs can be provided on the inner wall of the gate plate 8, and the guide groove 62 is formed between each pair of guide ribs. The guide structure guides the movement of the gate plate 8, which can improve the stability of the vertical movement of the gate plate 8.

Claims

1. An electric flat gate valve, comprising a valve body (1), a central cavity (2) disposed within the valve body (1), flow channels (3) disposed at both ends of the valve body (1) and communicating with the central cavity (2), a valve cover (4) mounted on the upper end of the valve body (1), a bracket (5) mounted on the valve cover (4), an electric actuator (6) disposed on the bracket (5), a valve stem (7) passing through the valve cover (4) and having its upper end connected to the output end of the electric actuator (6), and a gate plate (8) disposed within the central cavity (2), wherein the gate plate (8) has an overflow hole (9), and a valve seat (10) is respectively installed at the inner end of the two flow channels (3); characterized in that: The valve stem (7) has a connector (11) at its lower end, and a T-groove (63) at its lower end. The gate (8) has a T-shaped rod (12) at its upper end that cooperates with the T-groove (63), and the T-shaped rod (12) can move vertically a certain distance in the T-groove (63). The valve body (1) has a first mounting groove (13) and a second mounting groove (14) coaxially arranged on its inner wall. A fixing ring (64) is installed on the first mounting groove (13), and the valve seat (10) is slidably disposed in the second mounting groove (14). A linkage that forms a linkage with the valve seat (10) is installed on the fixing ring (64). Mechanism (15); when the gate (8) abuts against the bottom of the valve body (1) and the connector (11) moves downward or upward relative to the gate (8), the connector (11) cooperates with the linkage mechanism (15) to cause the linkage mechanism (15) to drive the valve seat (10) to move toward or away from the gate (8); the linkage mechanism (15) includes a movable shaft (16), a first spring (17), a telescopic trigger assembly (18), a connecting rod (19) and a plurality of second springs (20), the fixed ring (64) has a shaft hole (21) perpendicular to the gate (8), and the movable shaft (16) moves axially. The movable shaft (16) is located in the shaft hole (21). An annular groove (22) is provided on the outer circular surface of the movable shaft (16). A tapered transmission surface (23) is provided on the side of the annular groove (22) near the gate (8). The telescopic trigger assembly (18) is mounted on the fixed ring (64). The lower end of the telescopic trigger assembly (18) abuts against the tapered transmission surface (23). When the connector (11) pushes the telescopic trigger assembly (18) downward, the telescopic trigger assembly (18) drives the movable shaft (16) to move towards the gate (8). The first spring (17) applies a force to the movable shaft (16) towards the gate (8). The valve seat (10) is connected to the movable shaft (16) via the connecting rod (19) and the inner circular surface of the fixing ring (64) is provided with a strip hole (24) for the connecting rod (19) to pass through. The inner circular surface of the fixing ring (64) is also provided with an inwardly extending limiting flange (25). The limiting flange (25) is provided with a plurality of spring grooves (26) of the same number as the second spring (20). The second spring (20) is embedded in the corresponding spring groove (26), and the outer end of the second spring (20) abuts against the valve seat (10) and applies a force toward the direction away from the gate (8).

2. The electric flat gate valve according to claim 1, characterized in that: The telescopic trigger assembly (18) includes a trigger rod (27), a steel ball (28), a third spring (29), and an internal hexagonal nut (30). The upper end of the fixing ring (64) is provided with an upper threaded groove (31), a middle hole (32), and a lower hole (33) with decreasing inner diameters from top to bottom. The trigger rod (27) passes through the upper threaded groove (31), the middle hole (32), and the lower hole (33) from top to bottom. The trigger rod (27) is provided with a guide flange (34) on its outer periphery. The outer circular surface of the guide flange (34) is flush with the middle hole. The inner circular surface of (32) is in contact with each other. The third spring (29) is clamped between the guide flange (34) and the inner end of the middle hole (32) to apply an upward force to the trigger rod (27). The internal hexagonal nut (30) is threaded in the upper threaded groove (31) and sleeved on the outer circumference of the trigger rod (27) to form an upper stroke limit for the guide flange (34). The steel ball (28) is rolled between the lower end of the trigger rod (27) and the tapered transmission surface (23) of the movable shaft core (16).

3. The electric flat gate valve according to claim 1, characterized in that: The fixed ring (64) has a first threaded groove (35) at the outlet of the shaft hole (21) away from the gate plate (8). A first threaded sleeve (36) is threaded in the first threaded groove (35). The end of the movable shaft (16) away from the gate plate (8) extends out of the first threaded sleeve (36). The end of the movable shaft (16) away from the gate plate (8) is provided with a screw part (37). The inner end face of the first mounting groove (13) is provided with a relief groove (38) for the screw part (37) to extend into. A limiting washer (39) is sleeved on the outer periphery of the screw part (37). A locking nut (40) for pressing the limiting washer (39) against the end of the movable shaft (16) is also threaded on the screw part (37). The two ends of the first spring (17) abut against the first threaded sleeve (36) and the limiting washer (39) respectively.

4. The electric flat gate valve according to claim 3, characterized in that: The upper end of the valve seat (10) is provided with a threaded hole (41) extending radially. The lower end of the connecting rod (19) is threaded into the threaded hole (41). The lower end of the threaded hole (41) is threaded with a sealing plug (42). The outer circular surface of the movable shaft (16) is provided with an annular linkage groove (43). The upper end of the connecting rod (19) is inserted into the annular linkage groove (43).

5. The electric flat gate valve according to claim 4, characterized in that: The linkage mechanism (15) also includes an annular sealing seat (44) and a valve disc (45). The fixing ring (64) is provided with a second threaded groove (46) and a fixing groove (47) from the outside to the inside at the end of the shaft hole (21) near the gate plate (8). A second threaded sleeve (65) for pressing the valve disc (45) into the fixing groove (47) is threaded on the second threaded groove (46). The valve disc (45) is threaded to the end of the movable shaft (16) near the gate plate (8). The valve body (1) is provided with a pressure relief channel (48) that connects the relief groove (38) to the flow channel (3). A shaft hole (49) is provided axially through the movable shaft (16). The valve disc (45) is located near the end of the movable shaft (16) near the gate plate (8). A central manifold (50) is provided at one end of the shaft core (16), which is connected to the shaft core hole (49). A radial hole (51) is provided on the outer circular surface of the valve disc (45) and is connected to the central manifold (50). A conical sealing surface (52) is provided on the valve disc (45) for cooperating with the annular sealing seat (44). When the valve seat (10) abuts against the gate (8), the valve disc (45) abuts against the annular sealing seat (44), disconnecting the flow channel (3) from the middle cavity (2). When the valve seat (10) approaches or disengages from the gate (8), the valve disc (45) moves away from the annular sealing seat (44), connecting the flow channel (3) with the middle cavity (2).

6. The electric flat gate valve according to claim 5, characterized in that: The diameter of the upper end of the connecting rod (19) is smaller than the length of the annular linkage groove (43). An annular groove (53) is provided on the outer circular surface of the valve seat (10). A damping ring (54) is embedded in the annular groove (53). The outer circular surface of the damping ring (54) is in close contact with the inner circular surface of the second mounting groove (14).

7. The electric flat gate valve according to claim 1, characterized in that: The valve body (1) has an mounting boss (55) on its inner wall. The first mounting groove (13) is opened on the mounting boss (55). The mounting boss (55) has multiple positioning grooves (56) on its end face. The outer circle of the fixing ring (64) has multiple positioning protrusions (57) that fit into the positioning grooves (56). The outer circle of the mounting boss (55) is also threaded with a fixing sleeve (58). The inner circle of the fixing sleeve (58) has a pressing flange (59) for pressing the positioning protrusions (57) into the corresponding positioning grooves (56).

8. The electric flat gate valve according to claim 1, characterized in that: The valve seat (10) has an annular groove (60) at one end near the gate (8), and a sealing ring (61) is embedded in the annular groove (60) to form a sealing fit when it abuts against the gate (8).

9. The electric flat gate valve according to claim 1, characterized in that: The valve body (1) has a guide groove (62) extending vertically on the inner wall corresponding to the front and rear sides of the gate (8). The front and rear sides of the gate (8) are respectively slidably disposed in the corresponding guide groove (62) along the vertical direction.

Images