Fast-arc-extinguishing gil transmission and distribution disconnector operating device

Abstract

The application relates to the technical field of isolator operating devices, in particular to a quick arc-extinguishing GIL power transmission and distribution isolator operating device. The device comprises a mounting frame, an operating unit and at least one arc-extinguishing mechanism arranged on the mounting frame, the arc-extinguishing mechanism comprises an upper pull rod, a lower pull rod and an arc-extinguishing cylinder, the bottom end of the upper pull rod is rotationally installed with a static contact, a rotary torsional spring is arranged at the rotation connection position of the static contact, a buffer seat is slidably installed on the lower pull rod, a one-way friction damper is arranged between the buffer seat and the lower pull rod, an insulating sleeve is rotationally installed on the buffer seat, a dynamic contact is arranged at the end of the insulating sleeve, a rotational flow vane is fixed on the outer periphery of the dynamic contact, the height of the rotational flow vane is not higher than the contact surface of the dynamic contact, the static contact and the dynamic contact are oppositely arranged in the arc-extinguishing cylinder, and a closed air chamber is formed between the static contact and the dynamic contact. The device has the beneficial effects that a multi-dimensional and full-time sequence composite arc-extinguishing system can be formed, and the problems of single arc-extinguishing means and insufficient arc-extinguishing efficiency of the existing isolator are effectively solved.

Description

Technical Field

[0001] This invention relates to the technical field of disconnector operating devices, specifically to a fast arc-extinguishing GIL power transmission and distribution disconnector operating device. Background Technology

[0002] Disconnecting switches are indispensable switching devices in power systems, mainly used for isolating power sources, performing switching operations, and connecting and disconnecting low-current circuits. In GIL (Gas Insulated Line) transmission and distribution systems, disconnecting switches undertake key functions such as line segmentation and equipment maintenance isolation. With the continuous improvement of power system voltage levels and transmission capacity, higher requirements are placed on the operational reliability of disconnecting switches, especially their arc-extinguishing capability during the opening process. In the prior art, patent document CN114188177A discloses a 40.5kV vertical opening disconnecting switch, which adopts a gearbox drive combined with a motor and a reducer. While the drive arm can stop at any position and has a certain static holding force, its essence is still a uniform or near-uniform speed drive mode. The opening and closing speeds are basically the same, making it difficult to achieve rapid separation at the critical moment when an electric arc is generated. In addition, existing disconnect switches generally use conventional electric or manual mechanisms, which have slow opening and closing speeds and long arcing time when opening and closing currents are applied. Furthermore, during long-term operation, the moving and stationary contacts of existing disconnect switches are prone to the formation of oxide films or the accumulation of dirt, leading to increased contact resistance, increased temperature rise, and even partial discharge. At the same time, the arc extinguishing methods of existing disconnect switch operating mechanisms are simple and the arc extinguishing efficiency is insufficient. Based on this, the present invention provides a fast arc-extinguishing GIL power transmission and distribution disconnect switch operating device to solve the problems mentioned in the background art. Summary of the Invention

[0003] This invention addresses the technical problems existing in the prior art by providing a fast arc-extinguishing GIL power transmission and distribution disconnector operating device. This device solves the problems of low transmission efficiency, limited opening and closing speed, simple contact structure, lack of effective self-cleaning mechanism, and single arc-extinguishing method in existing disconnector operating devices, resulting in insufficient arc-extinguishing efficiency.

[0004] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: a fast arc extinguishing GIL power transmission and distribution disconnect switch operating device, including a mounting frame, an operating unit and at least one arc extinguishing mechanism disposed on the mounting frame; The arc-extinguishing mechanism includes an upper pull rod, a lower pull rod, and an arc-extinguishing cylinder; A stationary contact is rotatably mounted at the bottom of the upper pull rod, and a rotary torsion spring is provided at the rotatable connection between the two. A buffer seat is slidably mounted on the pull rod, and a one-way friction damper is provided between the two. An insulating sleeve is rotatably mounted on the buffer seat, and a moving contact is installed at the end of the insulating sleeve. Swirl blades are fixed on the outer periphery of the moving contact, and the height of the swirl blades is not higher than the contact surface of the moving contact. The stationary contact and the moving contact are positioned opposite each other inside the arc-extinguishing cylinder, forming a sealed gas chamber between them, which is filled with arc-extinguishing gas. Air passages are provided at the axial positions of both the moving contact and the stationary contact. A sliding piston is provided in the air passage, and the piston is connected to a return spring. Both the moving contact and the stationary contact have arrayed air inlets that allow gas to flow unidirectionally from the gas chamber into the gas passage, and air return holes that allow gas to flow unidirectionally from the gas passage back into the gas chamber. The ratio of the number of air return holes to the number of air inlets is 2:1 to 5:1. An electromagnetic coil is wound around the outer periphery of the arc-extinguishing cylinder, and a water-cooling jacket is fitted around the outer periphery of the electromagnetic coil; The operating unit drives the upper and lower levers to move, so that when closing the circuit, the two move synchronously relative to each other to close the moving and stationary contacts, and when opening the circuit, the two move synchronously in opposite directions to separate the moving and stationary contacts. Moreover, the speed of movement when opening the circuit is higher than the speed of movement when closing the circuit. During the closing and opening process, the moving contact rotates continuously, while the stationary contact is kept circumferentially stationary or only undergoes a momentary elastic micro-rotation by the rotary torsion spring.

[0005] Based on the above technical solution, the present invention can be further improved as follows.

[0006] Optionally, the arc extinguishing mechanism further includes a guide bracket fixedly installed on the mounting frame, the guide bracket being welded to the arc extinguishing cylinder, and the upper pull rod and the lower pull rod being slidably connected to the guide bracket.

[0007] Optionally, the arc-extinguishing mechanism further includes a bidirectional lead screw and a synchronous shaft rotatably mounted on a guide bracket. The bidirectional lead screw has a left-hand threaded section and a right-hand threaded section symmetrically arranged on it. The left-hand threaded section is connected to the upper pull rod, and the right-hand threaded section is connected to the lower pull rod. The bottom of the synchronous shaft and the bidirectional lead screw are both fixedly mounted with linkage gears, and the two linkage gears mesh with each other. The bottom of the arc-extinguishing cylinder is rotatably mounted with a bushing, and a synchronous belt is connected to the synchronous shaft. A hexagonal through hole is opened in the bushing, and the hexagonal through hole is slidably connected to the insulating sleeve. The cross-section of the hexagonal through hole and the insulating sleeve are both regular hexagonal.

[0008] Optionally, the operating unit includes a clutch slide slidably connected to a mounting bracket, a clutch push cylinder fixedly mounted on the mounting bracket, the movable output end of the clutch push cylinder fixedly connected to the clutch slide, a servo motor fixedly mounted on the clutch slide, an incomplete gear fixedly mounted on the output shaft of the servo motor, two energy storage shafts and a belt shaft rotatably mounted on the clutch slide, energy storage torsion springs are provided at the rotatable connection points between the two energy storage shafts and the clutch slide, the two energy storage torsion springs have the same number of coils but different preload torques and stiffness coefficients, a first differential gear and an energy storage gear are fixedly mounted on each of the two energy storage shafts, the two incomplete gears selectively mesh with the energy storage gear, a second differential gear is fixedly mounted on the belt shaft, and the two first differential gears selectively mesh with the second differential gear.

[0009] Optionally, the center angle corresponding to the effective meshing arc segment on the incomplete gear is 120°.

[0010] Optionally, the axis of the clutch push cylinder is perpendicular to the axis of the servo motor, and the two first differential gears are respectively arranged on both sides of the second differential gear.

[0011] Optionally, the unidirectional friction damper includes a friction ring fixedly mounted on the top of the buffer seat and a limiting sleeve fixedly mounted on the pull rod. The limiting sleeve is coaxially arranged with the friction ring. A buffer spring is installed between the friction ring and the pull rod. The inner wall of the limiting sleeve is provided with multiple serrated protrusions along the axial direction. The cross-section of each serrated protrusion is a right-angled triangle. The inclined surfaces of the multiple serrated protrusions face the same direction, and the inclined surfaces face the direction of movement relative to the buffer seat when the buffer spring is compressed. The straight surfaces of the multiple serrated protrusions face the direction away from the buffer seat when the buffer spring rebounds. The friction ring is made of polytetrafluoroethylene, and its contact surface with the limiting sleeve is provided with a rubber protrusion.

[0012] Optionally, the moving contact and the stationary contact are made of any one of copper-tungsten alloy, silver-tungsten alloy, or copper-chromium alloy.

[0013] Optionally, the water-cooled jacket is filled with a cooling medium, and a one-way breathable membrane is installed in both the air inlet and the air outlet.

[0014] The beneficial effects of this invention are: 1. In this invention, the moving contact rotates continuously throughout the closing and opening process, and a swirling blade is fixedly installed on its outer periphery. This swirling blade actively generates a directional tangential airflow at the moment of opening. Simultaneously, the electromagnetic coil wound around the outer periphery of the arc-extinguishing cylinder is energized to generate an axial magnetic field. The tangential airflow and the axial magnetic blowing force form an orthogonal synergistic effect in space, causing the arc to be axially elongated while simultaneously subjected to continuous tangential blowing, producing spiral stretching and twisting, extending the arc path and accelerating energy dissipation. This achieves active matching and real-time synergy between the air blowing direction and the magnetic blowing direction, improving arc extinguishing efficiency without the need for an external air source. Furthermore, the moving and stationary contacts... A connecting air passage is opened along the axis, and a piston with a return spring is installed in the air passage. An air inlet and an air return hole are opened on the contact end face, and the number of air return holes is two to five times that of the air inlet holes. When closing, the compressed gas in the air chamber flows into the air passage through the air inlet hole to push the piston to store energy. When opening, the return spring releases energy, and the high-pressure gas is concentrated and sprayed into the arc gap through the dominant number of air return holes, forming a secondary enhanced blowing. This energy time-shift multiplexing mechanism converts the closing impact energy into the opening arc extinguishing kinetic energy. Together with the aforementioned rotating swirl blades and electromagnetic coils, it forms a multi-dimensional, all-time composite arc extinguishing system, which effectively solves the problem of the single arc extinguishing method and insufficient arc extinguishing efficiency of the existing disconnecting switch.

[0015] 2. This invention achieves a higher opening speed than closing speed by differentiating the preload torque and stiffness coefficient of the two storage torsion springs in the operating unit, in conjunction with the switching mechanism of the incomplete gear and clutch slide. This allows the contacts to achieve a faster separation response in the initial stage of arc generation. The continuous rotation of the moving contact during the closing process generates relative micro-friction between it and the stationary contact, which effectively scrapes off the oxide film and adhering dirt on the contact surface, improves the contact condition, and reduces the contact resistance. The stationary contact is kept circumferentially stationary or only undergoes instantaneous elastic micro-rotation by the rotary torsion spring, avoiding rigid damage to the stationary contact caused by the closing impact. The unidirectional friction damper set between the pull rod and the buffer seat has a sawtooth protrusion and a straight surface corresponding to the closing buffer and opening damping, respectively. This ensures effective absorption of impact energy during closing and suppresses contact oscillation caused by the rebound of the buffer spring in the early stage of opening, ensuring smooth and high-speed opening movement. The above technical means systematically improve the operating performance of the disconnecting switch from multiple levels such as operating response, contact maintenance, and impact suppression. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the GIL (Gas Insulation Line) power transmission and distribution disconnector operating device of the present invention; Figure 2 For the present invention Figure 1 A schematic diagram of the cross-sectional structure; Figure 3 For the present invention Figure 2 A magnified schematic diagram of the partial structure at point A in the middle; Figure 4 For the present invention Figure 2 A magnified schematic diagram of the local structure at point B; Figure 5 For the present invention Figure 2 A magnified schematic diagram of the structure at point C in the middle; Figure 6 This is a schematic diagram of the clutch carriage and shaft of the present invention; Figure 7 For the present invention Figure 6 A structural diagram from another perspective; Figure 8 This is a schematic diagram of the energy storage gear of the present invention; Figure 9 This is a schematic diagram of the upper pull rod and the bidirectional lead screw of the present invention; Figure 10 For the present invention Figure 9 A structural diagram from another perspective; Figure 11 This is a schematic diagram of the structure of the upper pull rod and the stationary contact of the present invention; Figure 12 This is a schematic diagram of the synchronous shaft and air inlet of the present invention.

[0017] The attached diagram lists the components represented by each number as follows: 1. Mounting bracket; 2. Upper pull rod; 3. Lower pull rod; 4. Arc extinguishing cylinder; 5. Stationary contact; 6. Rotary torsion spring; 7. Buffer seat; 8. Insulating sleeve; 9. Moving contact; 10. Swirl blade; 11. Air chamber; 12. Air passage; 13. Piston; 14. Return spring; 15. Air inlet; 16. Air outlet; 17. Electromagnetic coil; 18. Water-cooled jacket; 19. Guide bracket; 20. Bidirectional lead screw; 21. Synchronous shaft; 22. Linkage gear; 23. Bushing; 24. Clutch slide; 25. Clutch push cylinder; 26. Servo motor; 27. Incomplete gear; 28. Power storage shaft; 29. ​​With shaft; 30. Power storage torsion spring; 31. First differential gear; 32. Power storage gear; 33. Second differential gear; 34. Friction ring flange; 35. Limiting sleeve; 36. Serrated ridge; 37. Buffer spring. Detailed Implementation

[0018] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0019] The present invention provides the following preferred embodiments. like Figure 1-12 As shown, the fast arc-extinguishing GIL power transmission and distribution disconnect switch operating device includes a mounting frame 1, an operating unit and two arc-extinguishing mechanisms mounted on the mounting frame 1; The arc extinguishing mechanism includes an upper pull rod 2, a lower pull rod 3, and an arc extinguishing cylinder 4, which is made of high-temperature resistant insulating material; A stationary contact 5 is rotatably mounted at the bottom end of the upper pull rod 2, and a rotary torsion spring 6 is provided at the rotatable connection between the two. A buffer seat 7 is slidably mounted on the pull rod 3, and a one-way friction damper is provided between the two. An insulating sleeve 8 is rotatably mounted on the buffer seat 7, and a moving contact 9 is installed at the end of the insulating sleeve 8. The one-way friction damper includes a friction ring 34 fixedly installed on the top of the buffer seat 7 and a limiting sleeve 35 fixedly installed on the pull rod 3. The limiting sleeve 35 is coaxially arranged with the friction ring 34. A buffer spring 37 is installed between the friction ring 34 and the pull rod 3. The inner wall of the limiting sleeve 35 is provided with a plurality of serrated protrusions 36 along the axial direction. The cross-section of each serrated protrusion 36 is a right triangle. The inclined surfaces of the plurality of serrated protrusions 36 face the same direction and face the direction of movement of the buffer spring 37 relative to the buffer seat 7 when it is compressed. The straight surfaces of the plurality of serrated protrusions 36 face the direction away from the buffer seat 7 when the buffer spring 37 rebounds. The friction ring 34 is made of polytetrafluoroethylene and has a rubber protrusion on its contact surface with the limiting sleeve 35. During the closing process, when the moving contact 9 and the stationary contact 5 close and come into contact, a mechanical impact or vibration occurs. The buffer seat 7 will slide down along the pull rod 3 and compress the buffer spring 37. At this time, the friction ring edge 34 slides on the inclined surface of the sawtooth protrusion 36 on the inner wall of the limit sleeve 35. Due to the inclined surface structure, the sliding resistance is relatively small, and it mainly plays the role of buffering and absorbing impact energy. During the opening process, the buffer spring 37 needs to rebound quickly to drive the moving contact 9 to separate rapidly. At this time, the movement direction of the friction ring edge 34 changes, and it will generate a large sliding friction resistance with the straight surface of the sawtooth protrusion 36. This unidirectionally increased damping force can effectively suppress the rebound or oscillation caused by the sudden release of the buffer spring 37 in the early stage of opening, making the separation movement of the moving contact 9 faster and smoother. Swirl blades 10 are fixed on the outer periphery of the moving contact 9. The swirl blades 10 have a straight plate structure and the height of the swirl blades 10 is not higher than the contact surface of the moving contact 9. The swirl vane 10 is fixedly connected to the moving contact 9 and rotates throughout the entire process of closing and opening the circuit under the drive of the operating unit. During the closing phase, the moving contact 9 rotates toward the stationary contact 5 to close, and the swirl vane 10 rotates accordingly, disturbing the arc-extinguishing gas in the gas chamber 11 in advance, causing it to generate a preparatory vortex.

[0020] During the opening phase, the moving contact 9 rotates and separates from the stationary contact 5, and the electric arc is elongated. At this time, the rotating swirl blades 10 act like a miniature fan, actively generating a directional, tangential high-speed airflow in the contact separation area. This airflow directly acts on the arc column, generating a strong blowing force on it.

[0021] At the same time, the electromagnetic coil 17 on the outer periphery of the arc-extinguishing cylinder 4 is energized, generating an axial magnetic field. The tangential airflow generated by the swirl blades 10 and the magnetic blowing force generated by the electromagnetic coil 17 work together to act on the electric arc. This causes the electric arc to not only be axially elongated, but also to be spirally stretched, twisted and accelerated under the tangential blowing of the airflow, and to be quickly dispersed into the depths of the arc-extinguishing gas.

[0022] The stationary contact 5 and the moving contact 9 are arranged opposite each other inside the arc-extinguishing cylinder 4, forming a sealed gas chamber 11 between them. The gas chamber 11 is filled with arc-extinguishing gas, which is sulfur hexafluoride. Both the moving contact 9 and the stationary contact 5 are made of copper-tungsten alloy. Air passages 12 are provided at the axial positions of both the moving contact 9 and the stationary contact 5. A slidable piston 13 is provided in the air passage 12. The piston 13 is connected to a return spring 14, which is located in the air passage 12. One-way breathable membranes are installed in both the air inlet 15 and the air outlet 16; Both the moving contact 9 and the stationary contact 5 have arrayed air inlet holes 15 that allow gas to flow unidirectionally from the gas chamber 11 into the gas passage 12, and air return holes 16 that allow gas to flow unidirectionally from the gas passage 12 back to the gas chamber 11. The ratio of the number of air return holes 16 to the number of air inlet holes 15 is 2:1 to 5:1, preferably 2:1. During the closing phase, when the moving contact 9 and the stationary contact 5 move relative to each other until they close and make contact, their end faces gradually approach each other and eventually press together. During this process, the volume of the air chamber 11 is compressed, and the internal air pressure increases instantaneously. The high-pressure gas overcomes the resistance of the one-way permeable membrane in the air inlet 15 and flows into the connecting air passage 12 inside the moving contact 9 and the stationary contact 5 through a small number of air inlets 15. This pushes the piston 13 in the air passage 12 to move and compress the return spring 14, converting the pressure energy and mechanical impact energy of this gas into the elastic potential energy of the spring and storing it. This process mainly plays the role of buffering the closing impact and storing energy.

[0023] During the opening phase, when the moving contact 9 and the stationary contact 5 begin to separate, an electric arc is generated, and the local temperature and pressure in the gas chamber 11 increase further. At this time, the previously compressed return spring 14 begins to release energy, pushing the piston 13 to move in the opposite direction. At the same time, due to the instantaneous negative pressure tendency generated by the increase in volume of the gas chamber 11 in the early stage of contact separation, and the driving force of the piston 13, the high-pressure gas stored in the air passage 12 is mainly sprayed back at high speed in one direction through a larger number of return air holes 16 into the gap between the contacts where the electric arc is forming. Since the total flow area of ​​the return air holes 16 is much larger than that of the air inlet 15, this generates a concentrated and strong blowing airflow.

[0024] An electromagnetic coil 17 is wound around the outer periphery of the arc extinguishing cylinder 4, and a water-cooling jacket 18 is fitted around the outer periphery of the electromagnetic coil 17, with a cooling medium filling the water-cooling jacket 18. In a preferred embodiment, a controller electrically connected to the electromagnetic coil 17 is further included, the controller being used to control the supply of a high-frequency pulse current to the electromagnetic coil 17 to generate a pulsed magnetic field; During the arc extinguishing process, the electromagnetic coil 17 outside the arc extinguishing cylinder 4 is energized to generate a magnetic field to drive the electric arc to move rapidly. However, the electromagnetic coil 17 itself will also generate Joule heat due to the large current. The water-cooling jacket 18 surrounding the electromagnetic coil 17 is filled with circulating cooling medium to dissipate heat from the electromagnetic coil 17. The arc extinguishing mechanism also includes a guide bracket 19 fixedly installed on the mounting frame 1. The guide bracket 19 is welded to the arc extinguishing cylinder 4, and the upper pull rod 2 and the lower pull rod 3 are slidably connected to the guide bracket 19.

[0025] The arc extinguishing mechanism also includes a bidirectional lead screw 20 and a synchronous shaft 21 rotatably mounted on the guide bracket 19. The bidirectional lead screw 20 is symmetrically provided with a left-hand threaded section and a right-hand threaded section. The left-hand threaded section is connected to the upper pull rod 2, and the right-hand threaded section is connected to the lower pull rod 3. The bottom of the synchronous shaft 21 and the bidirectional lead screw 20 are both fixedly mounted with linkage gears 22, and the two linkage gears 22 mesh with each other. A bushing 23 is rotatably mounted on the bottom of the arc-extinguishing cylinder 4. A synchronous belt is connected between the bushing 23 and the synchronous shaft 21. A hexagonal through hole is opened in the bushing 23. The hexagonal through hole is slidably connected to the insulating sleeve 8. The cross-sections of the hexagonal through hole and the insulating sleeve 8 are both regular hexagonal. The hexagonal through-hole is designed to ensure that the moving contact 9 can maintain its rotation without interruption when it moves. The operating unit drives the upper pull rod 2 and the lower pull rod 3 to move, so that when the circuit is closed, the two move synchronously relative to each other to close the moving contact 9 and the stationary contact 5. When the circuit is opened, the two move synchronously in opposite directions to separate the moving contact 9 and the stationary contact 5. Moreover, the movement speed when opening the circuit is higher than the movement speed when closing the circuit. During the closing and opening process, the moving contact 9 rotates continuously, while the stationary contact 5 remains circumferentially stationary or only undergoes a momentary elastic micro-rotation through the rotary torsion spring 6.

[0026] The operating unit includes a clutch slide 24 slidably connected to a mounting bracket 1. A clutch push cylinder 25 is fixedly mounted on the mounting bracket 1. The movable output end of the clutch push cylinder 25 is fixedly connected to the clutch slide 24. A servo motor 26 is fixedly mounted on the clutch slide 24. An incomplete gear 27 is fixedly mounted on the output shaft of the servo motor 26. Two power storage shafts 28 and a belt shaft 29 are rotatably mounted on the clutch slide 24. The rotatable connection points between the two power storage shafts 28 and the clutch slide 24 are each equipped with... The two storage torsion springs 30 have the same number of coils but different preload torque and stiffness coefficient. The first differential gear 31 and the storage gear 32 are fixedly installed on the two storage shafts 28. The two incomplete gears 27 selectively mesh with the storage gear 32. The center angle corresponding to the effective meshing arc of the incomplete gear 27 is 120°. The second differential gear 33 is fixedly installed on the belt shaft 29. The two first differential gears 31 selectively mesh with the second differential gear 33.

[0027] The axis of the clutch push cylinder 25 is perpendicular to the axis of the servo motor 26, and the two first differential gears 31 are respectively set on both sides of the second differential gear 33.

[0028] By setting the 120° center angle of the effective meshing arc segment on the incomplete gear 27, the incomplete gear 27 is not meshed with the two accumulator gears 32 at a specified angle. When it is necessary to charge the left accumulator shaft 28, the incomplete gear 27 meshes with the accumulator gear 32 on the accumulator shaft 28 on that side. In the charging state, the incomplete gear 27 and the accumulator gear 32 are engaged without disengaging. By setting the clutch push cylinder 25, the first differential gear 31 and the second differential gear 33 on the accumulator shaft 28 are meshed. When it is necessary to release the accumulator shaft 28, the incomplete gear 27 disengages, and the accumulator shaft 28 quickly drives the belt shaft 29 to rotate. When it is necessary to charge the right accumulator shaft 28, the same operation is performed to switch the closing and opening states. Furthermore, by setting the two storage torsion springs 30 to have the same number of coils but different preload torques and stiffness coefficients, the opening speed is greater than the closing speed.

[0029] The specific steps for using this invention are as follows: When the device is working normally, its core process is divided into two stages: closing and opening, both of which are precisely driven by the operating unit. The closing process begins with the start of the operating unit. The servo motor 26 meshes with the energy storage gear 32 on the corresponding energy storage shaft 28 through the incomplete gear 27, driving the energy storage shaft 28 to rotate and storing energy in the energy storage torsion spring 30 with a small preload torque and stiffness coefficient. At the same time, the clutch push cylinder 25 actuates the first differential gear 31 on the energy storage shaft 28 to mesh with the second differential gear 33 on the belt shaft 29. The power is then transmitted to the synchronous shaft 21 via the belt shaft 29 and the synchronous belt, and drives the bidirectional lead screw 20 to rotate through the linkage gear 22. The left-hand threaded section and the right-hand threaded section of the screw drive the upper pull rod 2 and the lower pull rod 3 to move synchronously relative to each other, thereby driving the moving contact 9 to close with the stationary contact 5. During this process, the moving contact 9 rotates continuously under the drive of the hexagonal through hole of the bushing 23. Its outer circumferential swirling blades 10 disturb the arc-extinguishing gas in the gas chamber 11 in advance to form a preparatory vortex, while the stationary contact 5 is kept circumferentially stationary by the rotary torsion spring 6. When the moving contact 9 rotates and contacts, the relative micro-motion friction between the two can effectively scrape off the oxide film on the contact surface to ensure low-resistance electrical contact, and the rotary torsion spring 6 is subjected to torque. The mechanical impact at the moment the contact closes is absorbed by the buffer spring 37 and the one-way friction damper under the buffer seat 7. At the same time, the high-pressure gas generated by the volume compression of the air chamber 11 flows into the connecting air passage 12 through the air inlet 15, pushing the piston 13 to compress the return spring 14 to store energy. The tripping process triggers the switching of the operating unit. The servo motor 26 drives another energy storage shaft 28 (whose energy storage torsion spring 30 has a larger stiffness coefficient) to store energy and then disengage. The energy storage torsion spring 30 is released quickly and drives the bidirectional lead screw 20 to rotate in the opposite direction at high speed through the differential gear system, so that the upper pull rod 2 and the lower pull rod 3 move synchronously in opposite directions. In the initial stage of circuit breaking, the friction ring edge 34 of the one-way friction damper and the straight surface of the sawtooth protrusion 36 on the limit sleeve 35 generate high damping, which suppresses the rebound oscillation of the buffer spring 37 and ensures that the moving contact 9 starts and separates smoothly and at high speed. When the moving contact 9 rotates and separates, an electric arc is generated. At this time, the swirl vane 10 rotates and generates a strong tangential airflow. The electromagnetic coil 17 is energized and generates an axial magnetic field. The combined effect of the two causes the electric arc to be stretched and twisted in a spiral shape. At the same time, the energy previously stored in the return spring 14 is released, pushing the piston 13 to spray the high-pressure gas in the air passage 12 back to the arc gap at high speed through the dominant number of return air holes 16, forming a concentrated blowing. The water-cooled jacket 18 outside the arc-extinguishing cylinder 4 continuously cools the electromagnetic coil 17.

[0030] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A fast arc-extinguishing GIL power transmission and distribution disconnector operating device, characterized in that, It includes a mounting frame, an operating unit mounted on the mounting frame, and at least one arc-extinguishing mechanism; The arc-extinguishing mechanism includes an upper pull rod, a lower pull rod, and an arc-extinguishing cylinder; A stationary contact is rotatably mounted at the bottom of the upper pull rod, and a rotary torsion spring is provided at the rotatable connection between the two. A buffer seat is slidably mounted on the pull rod, and a one-way friction damper is provided between the two. An insulating sleeve is rotatably mounted on the buffer seat, and a moving contact is installed at the end of the insulating sleeve. Swirl blades are fixed on the outer periphery of the moving contact, and the height of the swirl blades is not higher than the contact surface of the moving contact. The stationary contact and the moving contact are positioned opposite each other inside the arc-extinguishing cylinder, forming a sealed gas chamber between them, which is filled with arc-extinguishing gas. Air passages are provided at the axial positions of both the moving contact and the stationary contact. A sliding piston is provided in the air passage, and the piston is connected to a return spring. Both the moving contact and the stationary contact have arrayed air inlets that allow gas to flow unidirectionally from the gas chamber into the gas passage, and air return holes that allow gas to flow unidirectionally from the gas passage back into the gas chamber. The ratio of the number of air return holes to the number of air inlets is 2:1 to 5:

1. An electromagnetic coil is wound around the outer periphery of the arc-extinguishing cylinder, and a water-cooling jacket is fitted around the outer periphery of the electromagnetic coil; The operating unit drives the upper and lower levers to move, so that when closing the circuit, the two move synchronously relative to each other to close the moving and stationary contacts, and when opening the circuit, the two move synchronously in opposite directions to separate the moving and stationary contacts. Moreover, the speed of movement when opening the circuit is higher than the speed of movement when closing the circuit. During the closing and opening processes, the moving contact rotates continuously; The arc extinguishing mechanism also includes a guide bracket fixedly installed on the mounting frame. The guide bracket is welded to the arc extinguishing cylinder, and the upper pull rod and the lower pull rod are slidably connected to the guide bracket. The arc-extinguishing mechanism also includes a bidirectional lead screw and a synchronous shaft rotatably mounted on a guide bracket. The bidirectional lead screw is symmetrically provided with a left-hand threaded section and a right-hand threaded section. The left-hand threaded section is connected to the upper pull rod, and the right-hand threaded section is connected to the lower pull rod. The bottom of the synchronous shaft and the bidirectional lead screw are both fixedly mounted with linkage gears, and the two linkage gears mesh with each other. The bottom of the arc-extinguishing cylinder is rotatably mounted with a bushing, and a synchronous belt is connected to the synchronous shaft. A hexagonal through hole is opened in the bushing, and the hexagonal through hole is slidably connected to the insulating sleeve. The operating unit includes a clutch slide slidably connected to a mounting bracket. A clutch push cylinder is fixedly mounted on the mounting bracket. The movable output end of the clutch push cylinder is fixedly connected to the clutch slide. A servo motor is fixedly mounted on the clutch slide. An incomplete gear is fixedly mounted on the output shaft of the servo motor. Two energy storage shafts and a belt shaft are rotatably mounted on the clutch slide. Energy storage torsion springs are provided at the rotatable connection points between the two energy storage shafts and the clutch slide. The two energy storage torsion springs have the same number of coils but different preload torques and stiffness coefficients. A first differential gear and an energy storage gear are fixedly mounted on each of the two energy storage shafts. The two incomplete gears selectively mesh with the energy storage gear. A second differential gear is fixedly mounted on the belt shaft. The two first differential gears selectively mesh with the second differential gear. The unidirectional friction damper includes a friction ring fixedly mounted on the top of the buffer seat and a limiting sleeve fixedly mounted on the pull rod. The limiting sleeve is coaxially arranged with the friction ring. A buffer spring is installed between the friction ring and the pull rod. The inner wall of the limiting sleeve is provided with multiple serrated protrusions along the axial direction. The cross-section of each serrated protrusion is a right-angled triangle. The inclined surfaces of the multiple serrated protrusions face the same direction, and the inclined surfaces face the direction of movement relative to the buffer seat when the buffer spring is compressed. The straight surfaces of the multiple serrated protrusions face the direction away from the buffer seat when the buffer spring rebounds. The friction ring is made of polytetrafluoroethylene, and its contact surface with the limiting sleeve is provided with a rubber protrusion.

2. The fast arc-extinguishing GIL power transmission and distribution disconnector operating device according to claim 1, characterized in that, The cross-sections of the hexagonal through-hole and the insulating sleeve are both regular hexagons.

3. The fast arc-extinguishing GIL power transmission and distribution disconnector operating device according to claim 1, characterized in that, The central angle corresponding to the effective meshing arc segment on the incomplete gear is 120°.

4. The fast arc-extinguishing GIL power transmission and distribution disconnector operating device according to claim 1, characterized in that, The axis of the clutch push cylinder is perpendicular to the axis of the servo motor, and the two first differential gears are respectively arranged on both sides of the second differential gear.

5. The fast arc-extinguishing GIL power transmission and distribution disconnector operating device according to claim 1, characterized in that, The moving contact and the stationary contact are made of any one of copper-tungsten alloy, silver-tungsten alloy, or copper-chromium alloy.

6. The fast arc-extinguishing GIL power transmission and distribution disconnector operating device according to claim 1, characterized in that, The water-cooled jacket is filled with a cooling medium, and a one-way breathable membrane is installed in both the air inlet and air outlet.

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