Ring main unit quick-acting permanent magnet operating mechanism and method thereof

Abstract

The invention relates to the technical field of ring main units, in particular to a ring main unit quick-acting permanent magnet operating mechanism and a method thereof.The ring main unit quick-acting permanent magnet operating mechanism comprises an installation shell, an installation plate is fixedly connected to the top of the installation shell, a fixed sleeve is fixedly connected to the top of the installation plate, a static iron core is fixedly installed on the fixed sleeve, and the bottom end of the static iron core is fixedly inserted into the installation plate; a permanent magnet, an opening coil and a closing coil are fixedly mounted in the fixed sleeve, a sealing ring is fixedly connected in the mounting shell, and a movable iron core is slidably inserted in the axis of the sealing ring; according to the invention, the buffer coil is electrified to adjust the viscosity of the magnetorheological fluid, the quick action is ensured at the early stage of the movement of the movable iron core, the quick circuit break during opening is ensured, the equipment loss caused by circuit faults is reduced, and the impact and rebound generated by the movement of the movable iron core are reduced through the high damping of the magnetorheological fluid at the final stage of closing and opening, so that the safety of the device is improved. The risks of contact fusion welding and arcing are reduced, and the safety of equipment is improved.

Description

Technical Field

[0001] This invention relates to the field of ring main unit technology, and in particular to a fast-acting permanent magnet operating mechanism and method for ring main units. Background Technology

[0002] A ring main unit (RMU) is a complete set of switchgear used in power distribution networks. Its core function is to connect and segment a ring power supply network through the combination of multiple load switches or circuit breakers. It features a compact structure, high reliability, and full insulation and sealing. Primarily used to improve power supply reliability, it can quickly isolate fault points and restore power to non-faulty sections in the event of a fault. It is widely used in ring main power supply systems in urban power distribution networks, residential communities, and industrial and mining enterprises.

[0003] Patent document CN121565751A discloses a novel permanent magnet mechanism applicable to permanent magnet circuit breakers and ring main units. A stationary iron core and a moving iron core are arranged opposite each other along the axial direction inside an aluminum alloy shell. An internal tie rod passes through the axis of the aluminum alloy shell and moves through the stationary iron core and is connected to the moving iron core. A shaft fixing ring is movably arranged on the internal tie rod of the aluminum alloy shell. The shaft fixing ring moves against the side of the moving iron core away from the stationary iron core. The two sides of the shaft fixing ring are axially limited by locking nuts and total stroke adjusting nuts that are threaded to the internal tie rod.

[0004] In existing technologies, the permanent magnet operating mechanism inside the ring main unit mostly adopts a monostable or bistable design, which uses permanent magnets to maintain position and coil current to achieve displacement. In order to achieve the protection function, the permanent magnet operating mechanism requires an extremely high initial starting speed. The high-speed moving iron core is prone to violent impact and rebound at the end of the stroke, which can lead to contact welding or arcing. The iron core is buffered by contact friction during displacement. As the number of frictions increases, the friction surface wears down, the friction force decreases, and the buffering performance becomes unstable. Furthermore, it is difficult to change the buffering deceleration effect and stroke when the iron core is displaced. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a high-speed permanent magnet operating mechanism and method for ring main units.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a ring main unit fast-acting permanent magnet operating mechanism, including a mounting housing, a mounting plate fixedly connected to the top of the mounting housing, a fixed sleeve fixedly connected to the top of the mounting plate, a stationary iron core fixedly installed on the fixed sleeve, the bottom end of the stationary iron core fixedly inserted into the mounting plate, and a permanent magnet, a tripping coil and a closing coil fixedly installed inside the fixed sleeve. A sealing ring is fixedly connected inside the mounting housing. A moving iron core is slidably inserted at the center of the sealing ring. A piston is fixedly connected to the bottom end of the moving iron core. Both the piston and the internal cavity of the mounting housing are circular structures. The diameter of the piston is smaller than the inner diameter of the mounting housing. The inside of the mounting housing is filled with magnetorheological fluid, which is located at the bottom of the sealing ring. A buffer coil is fixedly installed on the inner wall of the mounting housing. The buffer coil is located at the bottom of the sealing ring and is immersed in the magnetorheological fluid. The top of the moving iron core is in contact with the bottom of the stationary iron core. A space adjustment component is installed inside the mounting housing. When the moving iron core undergoes axial displacement, the space adjustment component adjusts the internal space volume of the mounting housing accordingly.

[0007] Preferably, the space adjustment component includes a compensating airbag, which is fixedly connected to the bottom surface inside the mounting housing. A connecting air tube is fixedly inserted into the mounting housing, with one end of the connecting air tube communicating with the interior of the compensating airbag and the other end of the connecting air tube extending to the exterior of the mounting housing.

[0008] Preferably, multiple guide rollers are circumferentially fixedly connected between the bottom surface inside the mounting housing and the sealing ring. Multiple circular holes are circumferentially opened on the piston. The multiple guide rollers are slidably inserted into the corresponding circular holes. Multiple guide grooves are circumferentially opened on the surface of the guide rollers. Rotating shafts are rotatably connected inside each guide roller. Two sets of rotating grooves are opened on the surface of the guide rollers. The spacing between the multiple rotating grooves in the same set is the same. Guide rings are rotatably connected inside each set of rotating grooves. The guide rings are fixedly connected to the corresponding rotating shafts. Multiple mating grooves are circumferentially opened on the surface of the guide rings. When the mating grooves on the surface of one set of guide rings are completely connected to the corresponding guide grooves, the mating grooves on the surface of the other set of guide rings are isolated from the corresponding guide grooves. A drive assembly for driving multiple rotating shafts to rotate synchronously is provided on the mounting housing.

[0009] Preferably, the drive assembly includes a fixed frame, which is fixedly connected to the bottom of the mounting housing. The bottom ends of multiple rotating shafts penetrate the mounting housing and extend into the interior of the fixed frame, where they are fixedly connected to mating gears. A motor is fixedly mounted on the fixed frame, and a drive gear is fixedly connected to the output shaft of the motor. Multiple mating gears mesh with the drive gear.

[0010] Preferably, a retaining ring is fixedly connected to the bottom surface inside the mounting housing, the compensating airbag is located inside the retaining ring, and multiple guide rollers are located outside the retaining ring.

[0011] Preferably, the closing coil is coaxially sleeved inside the opening coil, and a magnetic shielding ring is fixedly connected inside the fixed sleeve, with the magnetic shielding ring located between the closing coil and the opening coil.

[0012] Preferably, an operating housing is fixedly connected to the surface of the mounting housing. A sliding groove is provided on one side of the mounting housing, and the sliding groove is connected to the interior of the operating housing. A sliding strip is fixedly connected to the surface of the moving iron core. One end of the sliding strip is slidably connected to the interior of the sliding groove. A snap-fit ​​block is fixedly connected to the sliding strip. A U-shaped frame is provided inside the operating housing. Two guide rods are fixedly connected to the U-shaped frame. A pressing strip is fixedly connected to the end of the two guide rods located outside the operating housing. A first spring is sleeved on each guide rod. The first spring is fixedly connected between the operating housing and the pressing strip. The U-shaped frame has a lead screw internally connected to a movable block threaded onto it. The movable block is slidably connected to the U-shaped frame. Two wedge-shaped clamps are provided on the side of the movable block near the sliding bar. The wedge-shaped clamps are equipped with elastic clearance components. A knob is fixedly connected to one end of the lead screw. The knob has an internal hexagonal groove. An operating hole is provided on the operating housing.

[0013] Preferably, the elastic clearance component includes two clearance grooves, both of which are located on the side of the movable block near the sliding bar. Two wedge-shaped clamping blocks are respectively connected to the corresponding clearance grooves. The movable block has two sets of through holes, each set containing two through holes. The two sets of through holes are respectively connected to the two clearance grooves. A limit ring is fixedly connected inside the through hole. A limit pin is slidably inserted inside the limit ring. One end of the limit pin is fixedly connected to the corresponding wedge-shaped clamping block. A second spring is sleeved on each limit pin. The second spring is fixedly connected between the corresponding wedge-shaped clamping block and the limit ring.

[0014] Preferably, a sealing baffle is fixedly connected to the U-shaped frame, one side of the sealing baffle contacts and blocks the operating hole, and the knob is connected inside the sealing baffle for rotation.

[0015] An operating method for a ring main unit's fast-acting permanent magnet operating mechanism, the method comprising the following steps: Step 1: When the circuit breaker is opened, the opening coil is energized. The magnetic field generated by the opening coil is opposite in direction to the magnetic field generated by the permanent magnet. The resulting electromagnetic force causes the moving iron core to move away from the stationary iron core along the sliding insertion point of the sealing ring, thereby driving the mechanism to open the circuit breaker. When the circuit breaker is closed, the closing coil is energized to generate a magnetic field and electromagnetic force. The magnetic field and electromagnetic force push the moving iron core closer to the stationary iron core and close the circuit breaker when it comes into contact with the stationary iron core. Step 2: During closing and opening, the moving iron core enters the early stage of movement. The buffer coil has no current, the magnetorheological fluid exhibits low viscosity, and the piston's movement resistance is small, ensuring the rapid movement of the moving iron core at the beginning of closing and opening. Step 3: When the moving iron core enters the middle stage of motion, the buffer coil is energized to generate a magnetic field. The magnetorheological fluid rapidly changes from a liquid state to a near-solid state, causing the viscosity of the magnetorheological fluid to increase sharply and generate a huge damping force, thereby flexibly braking the piston.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention adjusts the viscosity of the magnetorheological fluid by energizing the buffer coil, ensuring rapid movement of the moving iron core in the early stage of movement, ensuring rapid circuit breaking during opening, reducing equipment losses caused by circuit faults, and reducing the impact and rebound caused by the movement of the moving iron core by the high damping of the magnetorheological fluid at the end of closing and opening, reducing the risk of contact welding and arcing, and improving equipment safety; the viscous friction between the magnetorheological fluid and the piston 10 can effectively reduce the adverse effects of contact wear on deceleration and buffering, thereby extending the service life of the damping device.

[0017] 2. When the circuit is open, the moving iron core moves away from the stationary iron core and moves downward along the sliding joint of the sealing ring. As the moving iron core moves downward, the volume occupied by the moving iron core at the bottom of the sealing ring gradually increases. The gas inside the compensation airbag is gradually released through the airbag regulator. When the circuit is closed, the gas is replenished into the compensation airbag through the airbag regulator to ensure that the filling volume of the magnetorheological fluid remains unchanged and to reduce the impact of space changes on damping deceleration.

[0018] 3. After the moving iron core drives the piston to make a single axial movement, the drive assembly drives multiple rotating shafts to rotate synchronously at a certain angle, so that the mating grooves in the same group inside the circular hole are reconnected with the corresponding guide grooves, while the other set of mating grooves far from the piston is isolated from the corresponding guide grooves. This allows the moving iron core to drive the piston to decelerate during the later stages of closing and opening the circuit breaker by isolating the mating grooves and guide grooves. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a cross-sectional structural diagram of the present invention; Figure 3 For the present invention Figure 2 Enlarged schematic diagram of the structure at point A in the diagram; Figure 4 For the present invention Figure 2 Enlarged schematic diagram of the structure at point B in the diagram; Figure 5 For the present invention Figure 2 Enlarged schematic diagram of the structure at point C; Figure 6 This is a partial structural diagram of the present invention (the fixing frame and motor are hidden). Figure 7 For the present invention Figure 6 Enlarged schematic diagram of the structure at point D; Figure 8 This is a schematic diagram of the cooperation structure between the guide roller and the rotating shaft of the present invention; Figure 9 For the present invention Figure 8Enlarged schematic diagram of the structure at point E in the diagram; Figure 10 This is an exploded view of the assembly structure of the guide roller and the rotating shaft of the present invention; Figure 11 For the present invention Figure 10 Enlarged schematic diagram of the structure at point F; Figure 12 This is a schematic diagram of the U-shaped frame and movable block of the present invention (the movable block has been cut out). Figure 13 For the present invention Figure 12 A magnified schematic diagram of the structure at point G in the diagram.

[0020] In the diagram: 1. Mounting housing; 2. Mounting plate; 3. Fixing sleeve; 4. Stationary iron core; 5. Permanent magnet; 6. Opening coil; 7. Closing coil; 8. Sealing ring; 9. Moving iron core; 10. Piston; 11. Buffer coil; 12. Compensating airbag; 13. Connecting air pipe; 14. Guide roller; 15. Circular hole; 16. Guide groove; 17. Rotating shaft; 18. Rotating groove; 19. Guide ring; 20. Mating groove; 21. Fixing frame; 22. Mating gear; 23. Motor; 24. 25. Drive gear; 26. Retaining ring; 27. Magnetic shielding ring; 28. Operating housing; 29. ​​Sliding groove; 30. Sliding bar; 31. Snap-fit ​​block; 32. U-shaped frame; 33. Guide rod; 34. Pressing bar; 35. First spring; 36. Lead screw; 37. Movable block; 38. Wedge-shaped clamping block; 39. Knob; 40. Hexagonal socket; 41. Operating hole; 42. Relief groove; 43. Through hole; 44. Limiting ring; 45. Limiting pin; 46. Second spring; 47. Sealing baffle. Detailed Implementation

[0021] The following description is intended to disclose the invention and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art.

[0022] like Figures 1 to 13 The ring main unit quick-acting permanent magnet operating mechanism shown includes a mounting housing 1, a mounting plate 2 fixedly connected to the top of the mounting housing 1, a fixing sleeve 3 fixedly connected to the top of the mounting plate 2, a stationary iron core 4 fixedly mounted on the fixing sleeve 3, the bottom end of the stationary iron core 4 fixedly inserted into the mounting plate 2, and a permanent magnet 5, a tripping coil 6 and a closing coil 7 fixedly mounted inside the fixing sleeve 3. A sealing ring 8 is fixedly connected inside the mounting housing 1. A moving iron core 9 is slidably inserted at the axis of the sealing ring 8. A piston 10 is fixedly connected to the bottom end of the moving iron core 9. Both the piston 10 and the internal cavity of the mounting housing 1 are circular structures. The diameter of the piston 10 is smaller than the inner diameter of the mounting housing 1. The inside of the mounting housing 1 is filled with magnetorheological fluid, which is located at the bottom of the sealing ring 8. A buffer coil 11 is fixedly installed on the inner wall of the mounting housing 1. The buffer coil 11 is located at the bottom of the sealing ring 8 and is immersed in the magnetorheological fluid. The top end of the moving iron core 9 is in contact with the bottom end of the stationary iron core 4. A space adjustment component is provided inside the mounting housing 1. When the moving iron core 9 undergoes axial displacement, the space adjustment component adjusts the internal space volume of the mounting housing 1 accordingly. When the moving iron core 9 is in contact with the stationary iron core 4, the ring main unit is in the closed state. When a line fault occurs and it needs to be opened, the opening coil 6 is energized. The magnetic field generated by the opening coil 6 is opposite to the magnetic field generated by the permanent magnet 5. The generated electromagnetic force causes the moving iron core 9 to move away from the stationary iron core 4 along the sliding insertion point of the sealing ring 8, thereby driving the mechanism to open. When closing, the closing coil 7 is energized to generate a magnetic field and electromagnetic force. The magnetic field and electromagnetic force push the moving iron core 9 closer to the stationary iron core 4 and close the circuit when it comes into contact with the stationary iron core 4. When the moving iron core 9 moves axially along the sliding joint of the sealing ring 8, it drives the piston 10 to move synchronously in the magnetorheological fluid. During closing and opening, the moving iron core 9 enters the early stage of movement, the buffer coil 11 has no current, the magnetorheological fluid exhibits low viscosity, and the movement resistance of the piston 10 is small, ensuring the rapid movement of the moving iron core 9 at the beginning of closing and opening. When the moving iron core 9 enters the middle stage of movement, the buffer coil 11 is energized to generate a magnetic field, and the magnetorheological fluid rapidly changes from a liquid state to a near-solid state, causing the viscosity of the magnetorheological fluid to increase sharply and generate a huge damping force, thereby flexibly braking the piston 10 and greatly reducing the impact and rebound generated at the end of the movement of the moving iron core 9. As the moving iron core 9 moves axially, the volume of the moving iron core 9 inside the magnetorheological fluid changes. Through the action of the space adjustment component, the space volume inside the mounting housing 1 is adjusted to ensure that the magnetorheological fluid is always fully filled inside the mounting housing 1. This invention adjusts the viscosity of the magnetorheological fluid by energizing the buffer coil 11, ensuring rapid movement of the moving iron core 9 in the early stage of movement, ensuring quick circuit breaking during opening, reducing equipment losses caused by circuit faults, and reducing the impact and rebound caused by the movement of the moving iron core 9 during the final stages of closing and opening through the high damping of the magnetorheological fluid, thereby reducing the risk of contact welding and arcing and improving equipment safety; the viscous friction between the magnetorheological fluid and the piston 10 can effectively reduce the adverse effects of contact wear on deceleration and buffering, thereby extending the service life of the damping device.

[0023] As a further embodiment of the present invention, the space adjustment component includes a compensation airbag 12, which is fixedly connected to the bottom surface inside the mounting housing 1 (e.g., Figure 5 As shown), a connecting air tube 13 is fixedly inserted into the mounting housing 1. One end of the connecting air tube 13 is connected to the inside of the compensation airbag 12, and the other end of the connecting air tube 13 extends to the outside of the mounting housing 1. When the air pipe 13 is connected to the airbag regulator at the end outside the mounting housing 1, the moving iron core 9 is in contact with the stationary iron core 4. At this time, the volume occupied by the moving iron core 9 at the bottom of the sealing ring 8 is at its minimum. At this time, the total amount of gas inside the compensation airbag 12 is at its maximum. The gas filling allows the magnetorheological fluid to completely fill the internal space of the mounting housing 1 at the bottom of the sealing ring 8. When the circuit is open, the moving iron core 9 moves away from the stationary iron core 4 and moves downward along the sliding insertion of the sealing ring 8. As the moving iron core 9 moves downward, the volume occupied by the moving iron core 9 at the bottom of the sealing ring 8 gradually increases. The gas inside the compensation airbag 12 is gradually released through the airbag regulator. When the circuit is closed, the gas is replenished into the compensation airbag 12 through the airbag regulator to ensure that the filling volume of the magnetorheological fluid remains unchanged and to reduce the impact of space changes on damping deceleration.

[0024] As a further embodiment of the present invention, a plurality of guide rollers 14 are fixedly connected circumferentially between the bottom surface inside the housing 1 and the sealing ring 8. A plurality of circular holes 15 are circumferentially formed on the piston 10. The plurality of guide rollers 14 are slidably inserted into the corresponding circular holes 15. A plurality of guide grooves 16 are circumferentially formed on the surface of the guide rollers 14. A rotating shaft 17 is rotatably connected inside each guide roller 14. Two sets of rotating grooves 18 are formed on the surface of the guide rollers 14 (e.g., ...). Figure 11 As shown), the spacing between multiple rotating slots 18 in the same group is the same. The interior of each set of rotating slots 18 is rotatably connected to a guide ring 19. The guide ring 19 is fixedly connected to the corresponding rotating shaft 17. Multiple mating slots 20 are opened on the surface of the guide ring 19 along the circumferential direction. When the mating slot 20 on the surface of one set of guide rings 19 is fully connected to the corresponding guide slot 16, the mating slot 20 on the surface of the other set of guide rings 19 is isolated from the corresponding guide slot 16. The mounting housing 1 is provided with a drive assembly that drives multiple rotating shafts 17 to rotate synchronously. When the moving iron core 9 drives the piston 10 to move axially, the piston 10 slides along the surface of multiple guide rollers 14 through the sliding insertion of the guide rollers 14 and the circular holes 15. Before the piston 10 moves, one set of guide rings 19 is located inside the corresponding circular holes 15, and the mating grooves 20 on the guide rings 19 are connected to the corresponding guide grooves 16. Thus, when the piston 10 moves, the magnetorheological fluid can pass smoothly along the connection between the mating grooves 20 and the guide grooves 16, improving the speed of the piston 10. During the movement, the piston 10 moves closer to another set of guide rings 19. The mating grooves 20 on the other set of guide rings 19 are isolated from the corresponding guide grooves 16. Thus, when the other set of guide rings 19 moves relatively into the corresponding circular holes 15, the throughput of the magnetorheological fluid from the circular holes 15 is greatly reduced. While ensuring the rapid movement of the piston 10 in the early stage, the fluid resistance of the piston 10 in the later stage of movement is increased, further improving the deceleration effect of the piston 10 in the later stage of movement. After the moving iron core 9 drives the piston 10 to move axially once, the drive assembly drives multiple rotating shafts 17 to rotate synchronously at a certain angle, so that the mating grooves 20 in the same group inside the circular hole 15 are reconnected with the corresponding guide grooves 16, while the other set of mating grooves 20 away from the piston 10 is isolated from the corresponding guide grooves 16. This allows the moving iron core 9 to drive the piston 10 to decelerate during the later stages of closing and opening the circuit breaker by means of the mutual isolation between the mating grooves 20 and the guide grooves 16.

[0025] As a further embodiment of the present invention, the drive assembly includes a fixed frame 21, which is fixedly connected to the bottom of the mounting housing 1. The bottom ends of multiple rotating shafts 17 all penetrate the mounting housing 1 and extend into the interior of the fixed frame 21, where they are fixedly connected to mating gears 22. A motor 23 is fixedly mounted on the fixed frame 21, and a drive gear 24 is fixedly connected to the output shaft of the motor 23. Multiple mating gears 22 mesh with the drive gear 24. The output shaft of motor 23 rotates, driving the drive gear 24 to rotate in the forward and reverse directions at a certain angle. Through the meshing of the drive gear 24 with multiple mating gears 22, multiple rotating shafts 17 are driven to rotate synchronously, causing the guide ring 19 on the rotating shaft 17 to rotate and adjust the angle of the mating groove 20.

[0026] As a further embodiment of the present invention, a retaining ring 25 is fixedly connected to the bottom surface inside the mounting housing 1, the compensating airbag 12 is located inside the retaining ring 25, and the plurality of guide rollers 14 are all located outside the retaining ring 25. When the compensating airbag 12 deflates due to a reduction in internal gas, the retaining ring 25 isolates the compensating airbag 12 from the guide roller 14 to prevent the compensating airbag 12 from getting tangled on the guide roller 14 and to ensure that the compensating airbag 12 works normally.

[0027] As a further embodiment of the present invention, the closing coil 7 is coaxially sleeved inside the opening coil 6, and a magnetic shielding ring 26 is fixedly connected inside the fixing sleeve 3 (e.g., a magnetic shielding ring 26 is fixedly connected to the inside of the fixing sleeve 3). Figure 3 As shown), the magnetic isolation ring 26 is located between the closing coil 7 and the opening coil 6; The closing coil 7 and the opening coil 6 are isolated by the magnetic isolation ring 26 to prevent magnetic circuit coupling interference caused by the dual coil structure and to ensure the holding force during opening and closing drives.

[0028] As a further embodiment of the present invention, an operating housing 27 is fixedly connected to the surface of the mounting housing 1. A sliding groove 28 is provided on one side of the mounting housing 1, and the sliding groove 28 is connected to the interior of the operating housing 27. A sliding strip 29 is fixedly connected to the surface of the moving iron core 9. One end of the sliding strip 29 is slidably connected to the interior of the sliding groove 28. A snap-fit ​​block 30 is fixedly connected to the sliding strip 29. A U-shaped frame 31 is provided inside the operating housing 27. Two guide rods 32 are fixedly connected to the U-shaped frame 31. One end of the two guide rods 32 located outside the operating housing 27 is fixedly connected to a pressing strip 33. A first spring 34 is sleeved on each guide rod 32. The first spring 34 is fixedly connected between the operating housing 27 and the pressing strip 33. The U-shaped frame 31 is internally rotatably connected to a lead screw 35, and a movable block 36 is threaded onto the lead screw 35. The movable block 36 is slidably connected to the U-shaped frame 31. Two wedge-shaped clamps 37 are provided on the side of the movable block 36 near the sliding bar 29. An elastic clearance component is provided on the wedge-shaped clamps 37. A knob 38 is fixedly connected to one end of the lead screw 35. The knob 38 has an internal hexagonal groove 39. An operating hole 40 is provided on the operating housing 27. When the moving iron core 9 is driven by the closing coil 7 and the opening coil 6, the moving iron core 9 drives the sliding bar 29 to move synchronously. One end of the sliding bar 29 moves along the inside of the sliding groove 28. At this time, the locking block 30 on the sliding bar 29 does not contact the wedge-shaped clamping block 37 on the movable block 36. When the electromagnetic operating mechanism malfunctions, the operator presses the pressing bar 33, causing the guide rod 32 to slide along the sliding insertion point of the operating housing 27 and compressing the first spring 34 to produce compression deformation. This causes the U-shaped frame 31 and the movable block 36 to move towards the sliding bar 29, so that the locking block 30 moves relative to the two wedge-shaped clamping blocks 37. When the U-shaped frame 31 moves, it drives the rotating... When the knob 38 moves synchronously and the locking block 30 moves relative to the two wedge-shaped clamping blocks 37, the internal hexagonal groove 39 on one side of the knob 38 connects with the operating hole 40. The operator then inserts one end of the operating wrench into the operating hole 40, so that the hexagonal protrusion at one end of the operating wrench enters the internal hexagonal groove 39, and rotates the wrench to drive the knob 38 to rotate, so that the lead screw 35 rotates synchronously. Through the threaded connection between the lead screw 35 and the movable block 36, the movable block 36 moves synchronously along the sliding connection of the U-shaped frame 31. And through the clamping and limiting of the locking block 30 by the two wedge-shaped clamping blocks 37, the sliding bar 29 and the moving iron core 9 move synchronously, thereby manually opening and closing the moving iron core 9. When the locking block 30 and the movable block 36 are located at opposite ends, the two wedge-shaped clamping blocks 37 are brought closer to the locking block 30 by rotating the operating wrench. The inclined surface of one of the wedge-shaped clamping blocks 37 contacts and presses against the locking block 30, and the wedge-shaped clamping block 37 is moved aside by the action of the elastic relief component. When the locking block 30 is located between the two wedge-shaped clamping blocks 37, the wedge-shaped clamping blocks 37 return to the initial position and limit the locking block 30. Then, rotating the wrench in the opposite direction can drive the sliding bar 29 and the moving iron core 9 to move synchronously, thereby avoiding interference between the electromagnetic operating mechanism and the manual operating mechanism. Furthermore, when the locking block 30 and the movable block 36 are located at opposite ends, the locking block 30 can still be limited.

[0029] As a further embodiment of the present invention, the elastic clearance component includes two clearance grooves 41, both of which are formed on the side of the movable block 36 near the sliding bar 29 (e.g., Figure 4 as well as Figure 13 As shown), the two wedge-shaped clamping blocks 37 are respectively connected to the corresponding relief grooves 41. The movable block 36 is provided with two sets of through holes 42, each set of through holes 42 has two holes. The two sets of through holes 42 are respectively connected to the two relief grooves 41. The inside of the through hole 42 is fixedly connected to a limit ring 43. A limit pin 44 is slidably inserted inside the limit ring 43. One end of the limit pin 44 is fixedly connected to the corresponding wedge-shaped clamping block 37. A second spring 45 is sleeved on each limit pin 44. The second spring 45 is fixedly connected between the corresponding wedge-shaped clamping block 37 and the limit ring 43. When the wedge-shaped clamping block 37 contacts and presses against the locking block 30, the wedge-shaped clamping block 37 moves into the corresponding relief groove 41 and drives the limiting pin 44 to move along the sliding insertion of the limiting ring 43. At the same time, it compresses the second spring 45 to produce compression deformation. After the wedge-shaped clamping block 37 moves past the top of the locking block 30, the compressed second spring 45 presses the wedge-shaped clamping block 37 to reset through elastic extension and limits the locking block 30 between the two wedge-shaped clamping blocks 37.

[0030] As a further embodiment of the present invention, a sealing baffle 46 is fixedly connected to the U-shaped frame 31, one side of the sealing baffle 46 contacts and blocks the operation hole 40, and the knob 38 is rotatably connected inside the sealing baffle 46. Before the operator presses the pressing strip 33, the sealing baffle 46 blocks and seals the operating hole 40 to prevent dust and impurities from entering the operating housing 27. When the U-shaped frame 31 moves, it drives the sealing baffle 46 to move synchronously, thereby connecting the knob 38 with the operating hole 40.

[0031] An operating method for a ring main unit's fast-acting permanent magnet operating mechanism, the method comprising the following steps: Step 1: When the circuit breaker is opened, the opening coil 6 is energized. The magnetic field generated by the opening coil 6 is opposite in direction to the magnetic field generated by the permanent magnet 5. The resulting electromagnetic force causes the moving iron core 9 to move away from the stationary iron core 4 along the sliding insertion point of the sealing ring 8, thereby driving the mechanism to open the circuit breaker. When the circuit breaker is closed, the closing coil 7 is energized to generate a magnetic field and electromagnetic force. The magnetic field and electromagnetic force push the moving iron core 9 closer to the stationary iron core 4 and close the circuit breaker when it comes into contact with the stationary iron core 4. Step 2: During closing and opening, the moving iron core 9 enters the early stage of movement, the buffer coil 11 has no current, the magnetorheological fluid exhibits low viscosity, and the piston 10 has low resistance to movement, ensuring that the moving iron core 9 moves rapidly at the beginning of closing and opening. Step 3: When the moving iron core 9 enters the middle stage of motion, the buffer coil 11 is energized to generate a magnetic field. The magnetorheological fluid rapidly changes from a liquid state to a near-solid state, causing the viscosity of the magnetorheological fluid to increase sharply and generate a huge damping force, thereby flexibly braking the piston 10.

[0032] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection claimed by the appended claims and their equivalents is defined.

Claims

1. A fast-acting permanent magnet operating mechanism for a ring main unit, comprising a mounting housing (1), characterized in that, The top of the mounting housing (1) is fixedly connected to the mounting plate (2), the top of the mounting plate (2) is fixedly connected to the fixing sleeve (3), the fixing sleeve (3) is fixedly installed with the stationary iron core (4), the bottom end of the stationary iron core (4) is fixedly inserted into the mounting plate (2), and the inside of the fixing sleeve (3) is fixedly installed with the permanent magnet (5), the opening coil (6) and the closing coil (7). A sealing ring (8) is fixedly connected inside the mounting housing (1). A moving iron core (9) is slidably inserted at the axis of the sealing ring (8). A piston (10) is fixedly connected to the bottom end of the moving iron core (9). Both the piston (10) and the internal cavity of the mounting housing (1) are circular structures. The diameter of the piston (10) is smaller than the inner diameter of the mounting housing (1). The inside of the mounting housing (1) is filled with magnetorheological fluid. The magnetorheological fluid is located at the bottom of the sealing ring (8). A buffer coil (11) is fixedly installed on the inner wall of the mounting housing (1). The buffer coil (11) is located at the bottom of the sealing ring (8) and is immersed in the magnetorheological fluid. The top of the moving iron core (9) is in contact with the bottom of the stationary iron core (4). The space adjustment component is provided inside the mounting housing (1). When the moving iron core (9) undergoes axial displacement, the space adjustment component adjusts the internal space volume of the mounting housing (1).

2. The ring main unit high-speed permanent magnet operating mechanism according to claim 1, characterized in that, The space adjustment component includes a compensation airbag (12), which is fixedly connected to the bottom surface inside the mounting housing (1). A connecting air tube (13) is fixedly inserted into the mounting housing (1). One end of the connecting air tube (13) is connected to the inside of the compensation airbag (12), and the other end of the connecting air tube (13) extends to the outside of the mounting housing (1).

3. The ring main unit high-speed permanent magnet operating mechanism according to claim 2, characterized in that, Multiple guide rollers (14) are fixedly connected circumferentially between the bottom surface inside the housing (1) and the sealing ring (8). Multiple circular holes (15) are opened circumferentially on the piston (10). Multiple guide rollers (14) are slidably inserted into the corresponding circular holes (15). Multiple guide grooves (16) are opened circumferentially on the surface of the guide rollers (14). Rotating shafts (17) are rotatably connected inside the guide rollers (14). Two sets of rotating grooves (18) are opened on the surface of the guide rollers (14). The spacing between multiple rotating grooves (18) in the same set is the same. Both sets of rotating grooves (18) are rotatably connected to guide rings (19), and the guide rings (19) are fixedly connected to the corresponding rotating shafts (17). The surface of the guide rings (19) is provided with multiple mating grooves (20) along the circumferential direction. When the mating grooves (20) on the surface of one set of guide rings (19) are fully connected to the corresponding guide grooves (16), the mating grooves (20) on the surface of the other set of guide rings (19) are isolated from the corresponding guide grooves (16). The mounting housing (1) is provided with a drive assembly that drives multiple rotating shafts (17) to rotate synchronously.

4. The ring main unit high-speed permanent magnet operating mechanism according to claim 3, characterized in that, The drive assembly includes a fixed frame (21), which is fixedly connected to the bottom of the mounting housing (1). The bottom ends of multiple rotating shafts (17) penetrate the mounting housing (1) and extend into the interior of the fixed frame (21), where they are fixedly connected to mating gears (22). A motor (23) is fixedly mounted on the fixed frame (21), and a drive gear (24) is fixedly connected to the output shaft of the motor (23). Multiple mating gears (22) mesh with the drive gear (24).

5. The ring main unit high-speed permanent magnet operating mechanism according to claim 3, characterized in that, A retaining ring (25) is fixedly connected to the bottom surface inside the mounting housing (1). The compensating airbag (12) is located inside the retaining ring (25), and multiple guide rollers (14) are located outside the retaining ring (25).

6. The ring main unit's fast-acting permanent magnet operating mechanism according to claim 1, characterized in that, The closing coil (7) is coaxially sleeved inside the opening coil (6), and a magnetic shielding ring (26) is fixedly connected inside the fixed sleeve (3). The magnetic shielding ring (26) is located between the closing coil (7) and the opening coil (6).

7. The ring main unit's high-speed permanent magnet operating mechanism according to claim 1, characterized in that, An operating housing (27) is fixedly connected to the surface of the mounting housing (1). A sliding groove (28) is provided on one side of the mounting housing (1). The sliding groove (28) is connected to the inside of the operating housing (27). A sliding strip (29) is fixedly connected to the surface of the moving iron core (9). One end of the sliding strip (29) is slidably connected to the inside of the sliding groove (28). A snap block (30) is fixedly connected to the sliding strip (29). A U-shaped frame (31) is provided inside the operating housing (27). Two guide rods (32) are fixedly connected to the U-shaped frame (31). A pressing strip (33) is fixedly connected to one end of the two guide rods (32) located outside the operating housing (27). A first spring (34) is sleeved on each of the guide rods (32). The first spring (34) is fixedly connected between the operating housing (27) and the pressing strip (33). The U-shaped frame (31) is internally connected to a lead screw (35), and a movable block (36) is threaded onto the lead screw (35). The movable block (36) is slidably connected to the U-shaped frame (31). Two wedge-shaped clamps (37) are provided on the side of the movable block (36) near the sliding bar (29). An elastic clearance component is provided on the wedge-shaped clamps (37). A knob (38) is fixedly connected to one end of the lead screw (35). An internal hexagonal groove (39) is provided on the knob (38). An operating hole (40) is provided on the operating housing (27).

8. The ring main unit high-speed permanent magnet operating mechanism according to claim 7, characterized in that, The elastic clearance component includes two clearance grooves (41), both clearance grooves (41) are opened on the side of the movable block (36) near the sliding bar (29), and two wedge-shaped clamps (37) are respectively connected to the corresponding clearance grooves (41). The movable block (36) is provided with two sets of through holes (42), each set of through holes (42) has two holes, and the two sets of through holes (42) are respectively connected to the two clearance grooves (41). A limit ring (43) is fixedly connected inside the through hole (42), and a limit pin (44) is slidably inserted inside the limit ring (43). One end of the limit pin (44) is fixedly connected to the corresponding wedge-shaped clamp (37), and a second spring (45) is sleeved on the limit pin (44). The second spring (45) is fixedly connected between the corresponding wedge-shaped clamp (37) and the limit ring (43).

9. A ring main unit fast-acting permanent magnet operating mechanism according to claim 7, characterized in that, A sealing baffle (46) is fixedly connected to the U-shaped frame (31). One side of the sealing baffle (46) contacts and blocks the operation hole (40). The knob (38) is rotated and connected inside the sealing baffle (46).

10. An operating method for a ring main unit's fast-acting permanent magnet operating mechanism, applicable to the ring main unit's fast-acting permanent magnet operating mechanism as described in any one of claims 1-9, characterized in that... The method includes the following steps: Step 1: When the circuit breaker is opened, the opening coil (6) is energized. The magnetic field generated by the opening coil (6) is opposite to the magnetic field generated by the permanent magnet (5). The generated electromagnetic force causes the moving iron core (9) to move away from the stationary iron core (4) along the sliding insertion point of the sealing ring (8), thereby driving the mechanism to open the circuit breaker. When the circuit breaker is closed, the closing coil (7) is energized to generate a magnetic field electromagnetic force. The magnetic field electromagnetic force pushes the moving iron core (9) closer to the stationary iron core (4) and closes the circuit breaker when it comes into contact with the stationary iron core (4). Step 2: When closing and opening the circuit breaker, the moving iron core (9) enters the early stage of movement, the buffer coil (11) has no current, the magnetorheological fluid exhibits low viscosity, and the piston (10) has less resistance to movement, ensuring that the moving iron core (9) moves quickly at the beginning of closing and opening the circuit breaker. Step 3: When the moving iron core (9) enters the middle stage of motion, the buffer coil (11) is energized to generate a magnetic field. The magnetorheological fluid changes rapidly from a liquid state to a near-solid state, which causes the viscosity of the magnetorheological fluid to increase sharply and generate a huge damping force, thereby flexibly braking the piston (10).

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