Direct current high speed switch

Abstract

The application relates to a direct-current high-speed switch which comprises an insulating column, a three-connection transmission device, a first arc-extinguishing chamber, a second arc-extinguishing chamber and a first shielding cover, wherein the three-connection transmission device is respectively drivenly connected with the first arc-extinguishing chamber, the second arc-extinguishing chamber and the insulating column. The first shielding cover is in a spherical structure, and the first shielding cover is at least covered on the three-connection transmission device. In this way, the first shielding cover can change the electric field intensity concentrated on the three-connection transmission device into the electric field intensity uniformly distributed on the first shielding cover, reduce the electric field value on the parts near the three-connection transmission device, improve the influence of the external insulation corona effect on the electric field distribution, and improve the external insulation resistance performance and the insulation margin of the direct-current high-speed switch under the action of long-time direct-current voltage. Since the space between the first arc-extinguishing chamber and the second arc-extinguishing chamber is limited, the first shielding cover in the limited space is provided with the spherical structure, the curvature radius of the first shielding cover in the limited space is larger, and the electric field intensity on the first shielding cover is more uniform.

Description

Technical Field

[0001] This invention relates to the field of power switch technology, and in particular to a DC high-speed switch. Background Technology

[0002] With the in-depth research and construction of new power systems, DC systems will transition from the traditional "end-to-end" form to a "multi-end" form, eventually forming a "DC grid." Multi-end DC and DC grids, due to their stronger transmission capacity and more flexible operation, can effectively solve the problems of multiple power sources and multiple power delivery points, and will become one of the effective technical means to address the shortage of power transmission corridors and the large-scale grid connection of renewable energy in China.

[0003] High-speed DC switches (HSS) are key equipment in multi-terminal DC and even DC power grids. They are used for the on-line connection and disconnection of third stations at the load end and for the rapid isolation of DC line faults, playing a crucial role in supporting the flexible and reliable operation of DC systems. Common high-speed DC switches have poor external insulation withstand performance and insulation margin under long-term DC voltage. Summary of the Invention

[0004] Therefore, it is necessary to provide a DC high-speed switch to improve the external insulation withstand performance and insulation margin of the DC high-speed switch under long-term DC voltage.

[0005] A DC high-speed switch, comprising:

[0006] Insulating posts;

[0007] A three-stage transmission device is driven and connected to the insulating column.

[0008] A first arc-extinguishing chamber and a second arc-extinguishing chamber are respectively located on opposite sides of the triple-drive device and are respectively driven and connected to the triple-drive device; and

[0009] The first shielding cover is a spherical structure and is at least covered by the three-way transmission device.

[0010] In one embodiment, both the first arc-extinguishing chamber and the second arc-extinguishing chamber include a first insulating sleeve and a moving end pull rod. The moving end pull rod is movably disposed inside the first insulating sleeve and is drivenly connected to the three-way transmission device. The first shielding cover is disposed between the umbrella skirts of the first insulating sleeves of the first arc-extinguishing chamber and the second arc-extinguishing chamber.

[0011] In one embodiment, the DC high-speed switch further includes a first equalizing ring and a second equalizing ring. The first equalizing ring is installed at the end of the first insulating sleeve of the first arc-extinguishing chamber away from the moving end pull rod, and the second equalizing ring is installed at the end of the first insulating sleeve of the second arc-extinguishing chamber away from the moving end pull rod. The axial direction of the first equalizing ring and the second equalizing ring is the same as the axial direction of the first insulating sleeve.

[0012] In one embodiment, the diameter of both the first equalizing ring and the second equalizing ring is 2000mm to 2400mm, and the thickness of both the first equalizing ring and the second equalizing ring is 400mm to 600mm.

[0013] In one embodiment, the first insulating sleeve includes a tube body and an outer sleeve fitted onto the tube body, the outer sleeve being a silicone rubber sleeve; the outer sleeve includes a first skirt and a second skirt, the first skirt and the second skirt being alternately arranged along the axial direction of the tube body, the length of the first skirt being greater than the length of the second skirt; wherein, the upward tilt angle of the first skirt and the second skirt is both 5° to 35°, and the difference in length between the first skirt and the second skirt is greater than or equal to 15mm.

[0014] In one embodiment, the lengths of the first and second arc-extinguishing chambers along their axial directions are both 2600 mm to 3100 mm.

[0015] In one embodiment, the insulating column includes a second insulating sleeve and an insulating pull rod. The insulating pull rod is movably disposed within the second insulating sleeve and is drivenly connected to the three-way transmission device. The insulating column also includes a shielding ring, which is disposed within the second insulating sleeve and sleeved on the end where the insulating pull rod and the three-way transmission device are connected. The outer circumferential surface of the shielding ring is provided with an adsorption structure for absorbing moisture in the gas.

[0016] In one embodiment, at least two insulating columns are provided, all of which are coaxially arranged. Each insulating column also includes a connecting flange installed at the end of the second insulating sleeve, and the connecting flanges of two adjacent insulating columns are connected and fitted together. The insulating column also includes an insulating guide plate, which is disposed inside the second insulating sleeve and sandwiched between the connecting flanges of two adjacent insulating columns. The insulating guide plate has a through hole adapted to the insulating pull rod, and the insulating pull rod is inserted into the through hole.

[0017] In one embodiment, the connecting flange includes a flange and a neck connected to the flange, the neck being sleeved on the end of the second insulating sleeve; the flange includes a first disc portion and a second disc portion connected to the first disc portion, the first disc portion and the second disc portion being located on the outer and inner sides of the neck respectively, the first disc portions of two adjacent insulating columns being fixedly connected by a connector, and the insulating guide disc being sandwiched between the second disc portions of two adjacent insulating columns; the second disc portion has a first step portion on the side away from the neck, the first step portions of the second disc portions of two adjacent insulating columns cooperating to form a limiting groove, and the edge of the insulating guide disc being disposed within the limiting groove.

[0018] In one embodiment, the insulating column further includes an insulating pad disposed between the insulating guide plate and the insulating tie rod.

[0019] In one embodiment, the DC high-speed switch further includes a bracket and a drive mechanism mounted on the bracket, the drive mechanism being driven connected to the end of the insulating pull rod away from the three-way transmission device.

[0020] In operation, the aforementioned high-speed DC switch causes the insulating column to move along its axial direction, thereby driving the three-stage transmission device. This device, in turn, drives the components in the first and second arc-extinguishing chambers that are connected to the three-stage transmission device, thus achieving the opening and closing of the high-speed DC switch. Because the three-stage transmission device is an irregularly shaped body, the electric field intensity on it is relatively concentrated. Therefore, in this embodiment, a first spherical shield is provided at least at the three-stage transmission device. When the spherical shield is placed over the three-stage transmission device, it transforms the electric field intensity concentrated on the device into a uniformly distributed field intensity within the shield itself. This reduces the electric field value on components near the device, mitigates the impact of external insulation corona effect on the electric field distribution, and improves the external insulation withstand performance and insulation margin of the high-speed DC switch under long-term DC voltage. Furthermore, due to the limited space between the first and second arc-extinguishing chambers, by setting a spherical first shield at the triple-drive device, the first shield has a larger radius of curvature in the limited space compared to the shield ring, making the electric field intensity on the first shield more uniform. This effectively reduces the electric field value on the components near the triple-drive device and improves the external insulation withstand performance and insulation margin of the DC high-speed switch under long-term DC voltage. Attached Figure Description

[0021] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of a DC high-speed switch according to an embodiment of the present invention;

[0024] Figure 2 for Figure 1 A front view of a portion of the structure of the DC high-speed switch shown;

[0025] Figure 3 for Figure 2 A cross-sectional view of the insulating column of the DC high-speed switch shown.

[0026] Figure 4 for Figure 3 A magnified view of a portion of point A in the middle;

[0027] Figure 5 for Figure 3 A magnified view of a portion of point B in the middle;

[0028] Figure 6 for Figure 2 A cross-sectional view of the arc-extinguishing chamber of a DC high-speed switch shown;

[0029] Figure 7 for Figure 6 A magnified view of a portion of point C in the middle;

[0030] Figure 8 for Figure 6 A magnified view of a portion of point D in the middle;

[0031] Figure 9 for Figure 6 A cross-sectional view of the moving contact assembly of a DC high-speed switch shown.

[0032] Figure 10 for Figure 6 The diagram shows the structure of the moving contact of a DC high-speed switch.

[0033] Figure 11 for Figure 10 A cross-sectional view of the moving contact assembly of a DC high-speed switch shown.

[0034] Figure 12 This is a cross-sectional view of a three-stage drive device for a DC high-speed switch according to an embodiment of the present invention;

[0035] Figure 13 for Figure 12A partial structural schematic diagram of the three-stage drive device for the DC high-speed switch is shown.

[0036] Figure 14 This is a comparison table of electric field strengths of a DC high-speed switch with different shielding arrangements according to an embodiment of the present invention.

[0037] Figure 15 This is a comparison table of electric field strengths when the equalizing ring diameter and thickness of the DC high-speed switch are different according to an embodiment of the present invention.

[0038] Figure 16 This is a diagram showing the electric field distribution of the external insulation of a DC high-speed switch with the arc-extinguishing chamber at different lengths, according to an embodiment of the present invention.

[0039] Reference numerals: 10. Insulating column; 11. Second insulating sleeve; 12. Insulating tie rod; 13. Shielding ring; 14. Adsorption structure; 15. Connecting flange; 151. Flange; 1511. First disc section; 1512. Second disc section; 152. Neck; 153. Limiting groove; 16. Insulating guide plate; 17. Insulating pad; 20. Triple transmission device; 21. First transmission mechanism; 211. First transmission crank arm; 2111. First recessed area; 2112. First connecting part; 2113. Second recessed area; 2114. Second... 2115. Connecting part; 2116. First side; 2117. Second side; 2118. Third connecting part; 212. First connecting rod; 2121. First rod body; 2122. First connecting lug; 2123. Second connecting lug; 213. Second connecting rod; 2131. Second rod body; 2132. Third connecting lug; 2133. Fourth connecting lug; 22. Second transmission mechanism; 221. Second transmission crank arm; 222. Third connecting rod; 223. Fourth connecting rod; 25. First connecting shaft; 26. Housing; 27. Second connecting shaft 30. Arc-extinguishing chamber; 33. First arc-extinguishing chamber; 34. Second arc-extinguishing chamber; 35. First insulating sleeve; 351. Tube body; 352. Umbrella skirt outer sleeve; 3521. First umbrella skirt; 3522. Second umbrella skirt; 36. Moving contact assembly; 361. Moving support; 3611. Guide groove; 3612. Guide ring; 3613. First elastic ring; 3614. Sealing groove; 362. Compressed cylinder; 363. Moving contact; 3631. Airflow hole; 364. Moving arc contact; 365. Moving end pull rod; 366. Airflow space; 367. Nozzle; 3671, First nozzle section; 3672, Second nozzle section; 3673, Third nozzle section; 3674, Fourth nozzle section; 37, Stationary contact assembly; 371, Stationary support; 3711, Second step; 3712, Third step; 372, Stationary arc contact; 373, Stationary contact; 3731, Stationary contact body; 3732, Perforation; 374, Second shield; 3741, Mounting groove; 375, Elastic element; 40, First shield; 50, First equalizing ring; 60, Second equalizing ring; 70, Bracket; 80, Drive mechanism. Detailed Implementation

[0040] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0041] Please see Figure 1 and Figure 2An embodiment of the present invention provides a DC high-speed switch comprising an insulating column 10, a triple-drive device 20, an arc-extinguishing chamber 30, and a first shielding cover 40. The arc-extinguishing chamber 30 includes a first arc-extinguishing chamber 33 and a second arc-extinguishing chamber 34, which are respectively disposed on opposite sides of the triple-drive device 20. The triple-drive device 20 is driven and connected to the first arc-extinguishing chamber 33, the second arc-extinguishing chamber 34, and the insulating column 10. The first shielding cover 40 has a spherical structure and at least covers the triple-drive device 20.

[0042] In use, the aforementioned high-speed DC switch causes the insulating column 10 to move along its axial direction, thereby driving the triple-drive device 20 to move. The triple-drive device 20 then drives the components in the first arc-extinguishing chamber 33 and the second arc-extinguishing chamber 34 that are connected to the triple-drive device 20 to move, thus realizing the opening and closing of the high-speed DC switch. Since the triple-drive device 20 is an irregularly shaped body, the electric field intensity on it is relatively concentrated. Therefore, in this embodiment, at least a spherical first shield 40 is provided at the triple-drive device 20. When the spherical first shield 40 is placed over the triple-drive device 20, it can transform the electric field intensity concentrated on the triple-drive device 20 into a uniformly distributed electric field intensity on the first shield 40, reducing the electric field value on the components near the triple-drive device 20, improving the influence of the external insulation corona effect on the electric field distribution, and enhancing the external insulation withstand performance and insulation margin of the high-speed DC switch under long-term DC voltage. Furthermore, since the space between the first arc-extinguishing chamber 33 and the second arc-extinguishing chamber 34 is limited, by setting a spherical first shield 40 at the triple drive device 20, the first shield 40 has a larger radius of curvature in the limited space compared to the shield ring, making the electric field intensity on the first shield 40 more uniform, effectively reducing the electric field value on the components near the triple drive device 20, and improving the external insulation withstand performance and insulation margin of the DC high-speed switch under long-term DC voltage.

[0043] In one embodiment, see Figure 1 and Figure 14Both the first arc-extinguishing chamber 33 and the second arc-extinguishing chamber 34 include a first insulating sleeve 35 and a moving contact assembly 36. The moving contact assembly 36 includes a moving end pull rod, which is movably disposed within the first insulating sleeve 35 and is drivenly connected to the triple-drive device 20. A first shielding cover 40 is positioned between the skirts of the first insulating sleeve 35 of the first arc-extinguishing chamber 33 and the second arc-extinguishing chamber 34. In use, the insulating column 10 moves along its axial direction, thereby driving the triple-drive device 20 to move. The triple-drive device 20 respectively drives the moving end pull rods of the first arc-extinguishing chamber 33 and the second arc-extinguishing chamber 34 to move axially within the first insulating sleeve 35, realizing the opening and closing of the DC high-speed switch. Since the first shield 40 is positioned between the skirts of the first insulating sleeve 35 of the first arc-extinguishing chamber 33 and the second arc-extinguishing chamber 34, installation interference can be avoided. At the same time, the radius of curvature of the first shield 40 is larger, making the electric field intensity on the first shield 40 more uniform, effectively reducing the electric field value on the components near the triple drive device 20, and improving the external insulation withstand performance and insulation margin of the DC high-speed switch under long-term DC voltage.

[0044] It should be noted that the distance between the first shielding cover 40 and the first insulating sleeve 35 near the skirt of the triple-drive device 20 is 5mm to 20mm. This avoids installation interference caused by the first shielding cover 40 and the skirt of the first insulating sleeve 35 being too close, and also avoids a weakened shielding effect caused by the distance between the first shielding cover 40 and the skirt of the first insulating sleeve 35 being too large.

[0045] In one embodiment, see Figure 6 The first insulating sleeve 35 includes a tube body 351 and an outer skirt 352 sleeved on the tube body 351. The outer skirt 352 is a silicone rubber sleeve. It should be noted that the outer skirt 352 uses silicone rubber whose molecular backbone is composed of alternating silicon and oxygen atoms, and is formed through vulcanization. The silicon atoms are connected to unsaturated vinyl groups, and this low-unsaturation molecular structure gives silicone rubber excellent insulation properties. Optionally, the tube body 351 is a fiberglass cylinder.

[0046] Further, see Figure 6The umbrella-shaped outer sleeve 352 includes a first umbrella skirt 3521 and a second umbrella skirt 3522, which are alternately arranged along the axial direction of the tube body 351. The length of the first umbrella skirt 3521 is greater than the length of the second umbrella skirt 3522. The difference in length between the first umbrella skirt 3521 and the second umbrella skirt 3522 is greater than or equal to 15 mm, and the upward tilt angle of both the first umbrella skirt 3521 and the second umbrella skirt 3522 is 5° to 35°. Through electric field simulation calculations, when the upward tilt angle of both the first umbrella skirt 3521 and the second umbrella skirt 3522 is 7° and the length difference between the first umbrella skirt 3521 and the second umbrella skirt 3522 is 20 mm, the creepage distance of the first insulating sleeve 35 can be increased under size constraints, thereby improving the external insulation margin.

[0047] In one embodiment, see Figure 1 The DC high-speed switch also includes a first equalizing ring 50 and a second equalizing ring 60. The first equalizing ring is installed at the end of the first insulating sleeve 35 of the first arc-extinguishing chamber 33 away from the moving end pull rod, and the second equalizing ring 60 is installed at the end of the first insulating sleeve 35 of the second arc-extinguishing chamber 34 away from the moving end pull rod. The axial directions of both the first equalizing ring 50 and the second equalizing ring 60 are the same as the axial direction of the first insulating sleeve 35. It can be understood that the first equalizing ring 50 and the second equalizing ring 60 are respectively vertically positioned at the ends of the first insulating sleeve 35 of the first arc-extinguishing chamber 33 and the second arc-extinguishing chamber 34 away from the moving end pull rod. In this way, the first equalizing ring 50 and the second equalizing ring 60 can play a role in equalizing the electric field strength, which is beneficial to improving the external insulation withstand performance and insulation margin of the DC high-speed switch under long-term DC voltage.

[0048] Further, see Figure 1 and Figure 15 The diameters of both the first equalizing ring 50 and the second equalizing ring 60 are 2000mm to 2400mm, and the thicknesses are both 400mm to 600mm. Optionally, the diameter of the first equalizing ring 50 and the second equalizing ring 60 is 2200mm, and the thickness is 500mm. By limiting the diameters of the first equalizing ring 50 and the second equalizing ring 60 to the range of 2000mm to 2400mm and the thicknesses to the range of 400mm to 600mm, the internal electric field strength of the first arc-extinguishing chamber 33, the second arc-extinguishing chamber 34, the first equalizing ring 50, and the second equalizing ring 60 can be reduced.

[0049] In this embodiment, the diameter of both the first equalizing ring 50 and the second equalizing ring 60 is 2400 mm, and the thickness of both is 600 mm. This effectively improves the electric field strength of the first arc-extinguishing chamber 33, the second arc-extinguishing chamber 34, the first equalizing ring 50, and the second equalizing ring 60.

[0050] In one embodiment, see Figure 1 , Figure 2 and Figure 16 The lengths of the first arc-extinguishing chamber 33 and the second arc-extinguishing chamber 34 along their axial direction are both 2600mm to 3100mm. As the lengths of the first arc-extinguishing chamber 33 and the second arc-extinguishing chamber 34 along their axial direction increase, the electric field of the external insulation of the first arc-extinguishing chamber 33 and the second arc-extinguishing chamber 34 decreases as a whole. Limiting the lengths of the first arc-extinguishing chamber 33 and the second arc-extinguishing chamber 34 along their axial direction to the range of 2600mm to 3100mm can improve the long-term DC withstand performance of the DC high-speed switch on the one hand, and also prevent the static terminals of the first arc-extinguishing chamber 33 and the second arc-extinguishing chamber 34 from being subjected to excessive force and damaging their mechanical properties on the other hand.

[0051] In one embodiment, see Figure 3 and Figure 4 The insulating column 10 includes a second insulating sleeve 11 and an insulating pull rod 12. The insulating pull rod 12 is movably disposed within the second insulating sleeve 11 and is drivenly connected to the three-way transmission device 20. For details, please refer to... Figure 1 and Figure 2 The DC high-speed switch also includes a bracket 70 and a drive mechanism 80. The drive mechanism 80 is mounted on the bracket 70 and is driven connected to the end of the insulating pull rod 12 away from the triple transmission device 20. Optionally, the drive mechanism 80 is a hydraulic mechanism. In use, the drive mechanism 80 drives the insulating pull rod 12 to move along its axial direction, which in turn drives the triple transmission device 20 to move. The triple transmission device 20 drives the moving end pull rod to move, thereby realizing the opening and closing of the DC high-speed switch.

[0052] Further, see Figure 3 and Figure 4 The insulating column 10 also includes a shielding ring 13, which is located inside the second insulating sleeve 11 and fitted onto the end where the insulating pull rod 12 and the triple transmission device 20 are connected. Thus, by fitting the shielding ring 13 onto the end where the insulating pull rod 12 and the triple transmission device 20 are connected, the shielding ring 13 can evenly distribute the electric field of the insulating column 10.

[0053] Further, see Figure 4 The outer circumferential surface of the shielding ring 13 is provided with an adsorption structure 14 for absorbing moisture in the gas. In this way, the adsorption structure 14 can absorb moisture in the gas inside the second insulating sleeve 11, thereby improving the insulation performance.

[0054] In one embodiment, see Figure 1 , Figure 3 and Figure 5 At least two insulating posts 10 are provided, and all insulating posts 10 are coaxially arranged. Each insulating post 10 also includes a connecting flange 15 installed at the end of the second insulating sleeve 11, and the connecting flanges 15 of adjacent insulating posts 10 are connected and mated. In this way, the connection of two adjacent second insulating sleeves 11 is achieved through the connecting flanges 15.

[0055] Further, see Figure 3 and Figure 5 The insulating column 10 also includes an insulating guide plate 16, which is disposed within the second insulating sleeve 11 and sandwiched between the connecting flanges 15 of two adjacent insulating columns 10. The insulating guide plate 16 has a through hole 3732 adapted to the insulating pull rod 12, into which the insulating pull rod 12 is inserted. Optionally, the insulating guide plate 16 is cast from a relatively hard epoxy resin. Thus, the insulating guide plate 16 can serve a guiding function, making the movement of the insulating pull rod 12 directional and improving the stability of the movement of the insulating pull rod 12.

[0056] Specifically, see Figure 5 The connecting flange 15 includes a flange 151 and a neck 152 connected to the flange 151. The neck 152 is fitted onto the end of the second insulating sleeve 11. The flange 151 includes a first disc portion 1511 and a second disc portion 1512 connected to the first disc portion 1511. The first disc portion 1511 and the second disc portion 1512 are located on the outer and inner sides of the neck 152, respectively. The first disc portions 1511 of two adjacent insulating columns 10 are fixedly connected by a connector, and the insulating guide disc 16 is sandwiched between the second disc portions 1512 of two adjacent insulating columns 10. Specifically, the second disc portion 1512 has a first step portion on the side facing away from the neck 152. The first step portions of the second disc portions 1512 of two adjacent insulating columns 10 cooperate to form a limiting groove 153, and the edge of the insulating guide disc 16 is located within the limiting groove 153. In this way, the limiting groove 153 limits the insulating guide disc 16, realizing the stable installation of the insulating guide disc 16.

[0057] Further, see Figure 5 The insulating column 10 also includes an insulating pad 17, which is disposed between the insulating guide plate 16 and the insulating pull rod 12. Optionally, the insulating pad 17 is made of a relatively soft nitrile rubber material to prevent foreign objects from falling off when the insulating pull rod 12 rubs.

[0058] In one embodiment, see Figure 6 and Figure 7The first insulating sleeve 35 has a receiving cavity and a first break communicating with the receiving cavity. The moving contact assembly 36 also includes a moving support 361, a pressure cylinder 362, a moving contact 363, and a moving arc contact 364. The moving support 361 is inserted into the receiving cavity and connected to the end of the first insulating sleeve 35 with the first break. The moving support 361 has an inner hole that extends axially along the moving support 361, and the moving end pull rod 365 is movably inserted into the inner hole. The moving arc contact 364 is installed at the end of the moving end pull rod 365 away from the triple transmission device 20 and is coaxially arranged with the moving end pull rod 365. The moving contact 363 is sleeved on the moving arc contact 364 and connected to the moving end pull rod 365. A pressure cylinder 362 is sleeved on the moving contact 363 and the moving support 361. The pressure cylinder 362 is fixedly connected to the moving contact 363 and slidably connected to the moving support 361. The pressure cylinder 362, the moving contact 363, and the moving end pull rod 365 form an airflow space 366. The moving contact 363 is provided with an airflow hole 3631 that communicates with the airflow space 366. The airflow hole 3631 automatically extends from the side of the moving contact 363 near the moving support 361 towards the side of the moving contact 363 away from the moving support 361.

[0059] During closing, the moving end lever 365, under the action of the three-way transmission device 20, drives the pressure cylinder 362, moving contact 363, and moving arc contact 364 to move away from the first break. During the closing movement, the moving arc contact 364 generates an electric arc. At the same time, the airflow space 366 formed by the pressure cylinder 362, moving contact 363, and moving end lever 365 expands and forms a negative pressure, drawing the arc ions generated by the moving arc contact 364 from the airflow hole 3631 into the airflow space 366 of the pressure cylinder 362, so as to quickly reduce the arc temperature and prevent the electric arc generated during closing from burning out the components. During opening, the moving end lever 365, under the action of the three-way transmission device 20, drives the pressure cylinder 362, moving contact 363, and moving arc contact 364 to move closer to the first break. During the opening process, the airflow space 366 formed by the air cylinder 362, moving contact 363, and moving end lever 365 is compressed, generating high-pressure SF6 gas. The high-pressure gas in the air cylinder 362 is exhausted through the airflow hole 3631 of the moving contact 363 to deionize the ions generated during the breaking process, thereby extinguishing the arc. By setting the airflow hole 3631 in the moving contact 363, the airflow hole 3631 automatically extends from the side of the contact 363 near the moving support 361 towards the side of the moving contact 363 away from the moving support 361. In this way, during the opening process, the high-pressure gas in the airflow space 366 formed by the air cylinder 362, moving contact 363, and moving end lever 365 can be smoothly blown towards the arc through the airflow hole 3631, which is beneficial to improving the ability to break small DC currents.

[0060] In one embodiment, see Figure 11The angle between the axis of the airflow orifice 3631 and the axis of the moving contact 363 is θ, where 25°≤θ≤45°. Thus, during the opening process, the high-pressure gas in the airflow space 366 formed by the pressure cylinder 362, the moving contact 363, and the moving end pull rod 365 can be smoothly blown towards the arc through the airflow orifice 3631, which is beneficial for improving the ability to interrupt small DC currents. Specifically, in this embodiment, the angle between the axis of the airflow orifice 3631 and the axis of the moving contact 363 is 30°.

[0061] In one embodiment, see Figure 10 The airflow orifice 3631 is an oblong orifice that extends circumferentially along the moving contact 363. This increases the airflow through the airflow orifice 3631, allowing more high-pressure gas in the airflow space 366 to be blown toward the arc during the opening process, thus improving the ability to interrupt small DC currents.

[0062] Optionally, see Figure 10 and Figure 11 Two airflow holes 3631 are provided, both of which are oblong orifices. The two airflow holes 3631 are spaced apart circumferentially along the moving contact 363 and are symmetrically arranged about the central axis of the moving contact 363. The circumferential spacing H between the two airflow holes 3631 is 25mm, and the median diameter of the oblong orifice is... The diameter is 128mm, and the radius of the semicircular arc at both ends of the waist-shaped hole is 11mm.

[0063] In one embodiment, see Figure 6 and Figure 7 The moving contact assembly 36 also includes a nozzle 367. The nozzle 367 is connected to the moving contact 363 on the side away from the moving support 361, and the airflow hole 3631 is located inside the nozzle 367. The end of the moving arc contact 364 away from the moving end pull rod 365 is inserted into the nozzle 367. Furthermore, the nozzle 367 and the moving contact 363 are sealed together. Optionally, a sealant is provided between the nozzle 367 and the moving contact 363 to seal them. This prevents high-pressure gas from leaking out between the moving contact 363 and the nozzle 367, allowing all the high-pressure gas to flow out through the nozzle 367, which is beneficial for better arc extinguishing.

[0064] Further, see Figure 6 and Figure 9The nozzle 367 includes a first nozzle segment 3671, a second nozzle segment 3672, a third nozzle segment 3673, and a fourth nozzle segment 3674 connected in sequence. The first nozzle segment 3671 has an automatic contact 363 extending away from the moving contact 363 along the axial direction of the moving arc contact 364. The second nozzle segment 3672 is inclined from the side of the first nozzle segment 3671 away from the moving contact 363 towards the axial direction closer to the moving arc contact 364. The third nozzle segment 3673 extends from the side of the second nozzle segment 3672 away from the first nozzle segment 3671 along the axial direction of the moving arc contact 364. The fourth nozzle segment 3674 is inclined from the side of the third nozzle segment 3673 away from the second nozzle segment 3672 towards the axial direction away from the moving arc contact 364. The end of the moving arc contact 364 furthest from the moving end pull rod 365 is inserted into the first nozzle section 3671, and an airflow channel communicating with the airflow hole 3631 is formed between the moving arc contact 364 and the first nozzle section 3671 at an interval. Since the first nozzle section 3671 extends axially along the moving arc contact 364, this avoids installation interference between the nozzle 367 and other components. Since the second nozzle section 3672 is inclined axially from the side of the first nozzle section 3671 furthest from the moving contact 363 toward the moving arc contact 364, the second nozzle section 3672 can guide high-pressure gas to blow towards the third nozzle section 3673 so that the high-pressure gas extinguishes the arc. Since the fourth nozzle section 3674 is inclined axially away from the third nozzle section 3673 away from the second nozzle section 3672, that is, the diameter of the fourth nozzle section 3674 gradually increases from the third nozzle section 3673 away from the third nozzle section 3673, the high-pressure gas flow rate is controlled, ensuring the breaking performance of the first arc-extinguishing chamber 33 and the second arc-extinguishing chamber 34.

[0065] Furthermore, the diameter of the third nozzle section 3673 is 30mm to 40mm, and the angle between the fourth nozzle section 3674 and the axis of the moving arc contact 364 is 5° to 10°. In this way, without affecting the gas flow, the gas blowing is made more intense, the arcing time is shorter, and the optimal configuration of high-pressure gas pressure and gas blowing volume of nozzle 367 is achieved when the initial DC current is small.

[0066] Optionally, the diameter of the third nozzle section 3673 is 38 mm, and the angle between the fourth nozzle section 3674 and the axis of the moving arc contact 364 is 7.5°.

[0067] In one embodiment, see Figure 6 and Figure 7The outer circumferential surface of the movable support 361 is provided with a guide groove 3611, and the movable contact assembly 36 also includes a guide ring 3612, which is disposed within the guide groove 3611. The pressure cylinder 362 is guided and engaged with the movable support 361 through the guide ring 3612. In this way, the guide ring 3612 can constrain the axial movement of the pressure cylinder 362 along the movable support 361, making the movement of the pressure cylinder 362 directional and improving the stability of the movement of the pressure cylinder 362.

[0068] Further, see Figure 7 The moving contact assembly 36 also includes a first elastic ring 3613, which is disposed within the guide groove 3611, and a guide ring 3612 is sleeved on the first elastic ring 3613. In this way, the first elastic ring 3613 has a certain degree of elasticity, which ensures that the guide ring 3612 has a guiding function while preventing the cylinder 362 from jamming during operation.

[0069] In one embodiment, see Figure 7 The outer circumferential surface of the movable support 361 is also provided with a sealing groove 3614. The movable contact assembly 36 also includes a sealing ring, which is disposed within the sealing groove 3614. The pressure cylinder 362 is sealed to the movable support 361 through the sealing ring. In this way, the pressure cylinder 362 is sealed to the movable support 361 through the sealing ring, which can improve the sealing performance of the pressure cylinder 362 and prevent high-pressure gas from escaping from the position between the pressure cylinder 362 and the movable support 361, so as to obtain higher pressure gas, which is beneficial to quickly extinguish the arc.

[0070] Optionally, the sealing ring is coated with grease. This reduces the friction between the sealing ring and the pressure cylinder 362, allowing the pressure cylinder 362 to move smoothly.

[0071] In one embodiment, see Figure 6The first insulating sleeve 35 has a second break, which is positioned opposite to the first break. The first arc-extinguishing chamber 33 and the second arc-extinguishing chamber 34 also include a stationary contact assembly 37, which includes a stationary support 371, a stationary arc contact 372, and a stationary contact 373. The stationary support 371 is inserted into the receiving cavity and connected to the end of the first insulating sleeve 35 with the second break. Both the stationary arc contact 372 and the stationary contact 373 are mounted on the side of the stationary support 371 facing the moving contact assembly 36. The stationary arc contact 372 and the moving arc contact 364 are coaxially arranged, with the stationary contact 373 surrounding the stationary arc contact 372. When closing the circuit, the moving end lever 365, under the action of the three-way transmission device 20, drives the air cylinder 362, the moving contact 363, and the moving arc contact 364 to move towards the stationary contact assembly 37. During the closing process, the moving arc contact 364 and the stationary arc contact 372 generate an electric arc. At the same time, the airflow space 366 formed by the air cylinder 362, the moving contact 363, and the moving end lever 365 expands and forms a negative pressure, which draws the arc ions generated by the moving arc contact 364 and the stationary arc contact 372 into the air cylinder 362 through the airflow hole 3631, rapidly reducing the arc temperature and preventing the arc generated during closing from burning out the components. During the opening process, the moving end lever 365, under the action of the three-way transmission device 20, drives the air cylinder 362, moving contact 363, and moving arc contact 364 to move away from the stationary contact assembly 37. During the opening process, the airflow space 366 formed by the air cylinder 362, moving contact 363, and moving end lever 365 is compressed, generating highly compressed SF6 gas. The air cylinder 362 continues to move, and when the stationary arc contact 372 separates from the nozzle 367, the high-pressure gas in the airflow space 366 is exhausted through the airflow hole 3631 and the nozzle 367 to deionize the ions generated during the breaking process, thereby extinguishing the arc.

[0072] Further, see Figure 6 and Figure 8 The stationary contact 373 includes a second elastic ring and multiple stationary contact bodies 3731, which are arranged circumferentially along the stationary support 371. Each stationary contact body 3731 has a through hole 3732 at one end near the stationary support 371. The second elastic ring passes through the through hole 3732 of each stationary contact body 3731, and the multiple stationary contact bodies 3731 are secured to the outer circumferential surface of the stationary support 371 facing the moving contact assembly 36 by the second elastic ring. Optionally, the second elastic ring is an elastic steel wire ring. Thus, using the second elastic ring to connect the multiple stationary contact bodies 3731 together in series prevents the stationary contact bodies 3731 from scattering due to improper force applied by the operator during installation, thereby improving production efficiency. Furthermore, the second elastic ring also provides contact force between the multiple stationary contact bodies 3731 and the stationary support 371.

[0073] In one embodiment, see Figure 6 and Figure 8The stationary contact assembly 37 also includes a second shield 374, which is coaxially arranged with and connected to the stationary support 371. The second shield 374 covers the stationary contact 373. This prevents tip discharge from occurring on the stationary contact 133.

[0074] Further, see Figure 6 and Figure 8 The stationary contact assembly 37 also includes an elastic element 375, which is disposed between the stationary contact 373 and the second shield 374. Multiple elastic elements 375 are provided, with each corresponding to one of the stationary contact bodies 3731. One end of the elastic element 375 abuts against the outer peripheral surface of the stationary contact body 3731, and the other end abuts against the inner peripheral surface of the second shield 374. Thus, the elastic element 375 provides a clamping force, pressing the stationary contact body 3731 against the outer peripheral surface of the stationary support 371 facing the moving contact assembly 36. Furthermore, this ensures a uniform distribution of the stationary contact bodies 3731, preventing uneven distribution from causing them to squeeze against each other, leading to offsetting clamping forces and reduced flow capacity, thereby improving product reliability.

[0075] Optionally, the elastic element 375 is a leaf spring. The outer peripheral surface of the stationary contact body 3731 is provided with a first groove, and the inner peripheral surface of the second shield 374 is provided with a corresponding second groove. One end of the leaf spring is inserted into the first groove, and the other end is inserted into the second groove.

[0076] Further, see Figure 8 The stationary support 371 has a second step 3711 and a third step 3712 on its outer peripheral surface facing the moving contact assembly 36. The second step 3711 is closer to the outer peripheral surface of the stationary support 371 than the third step 3712. One end of the second shield 374 is mounted on the second step 3711, and the end of the second shield 374 away from the stationary support 371 has a mounting groove 3741. One end of the stationary contact 373 is mounted on the third step 3712, and the other end is inserted into the mounting groove 3741. Thus, one end of the second shield 374 and one end of the stationary contact 373 are respectively mounted on the second step 3711 and the third step 3712, forming a gap between the stationary contact 373 and the second shield 374 for mounting the elastic member 375. One end of the second shield 374 is installed on the third step portion 3712, and the other end is inserted into the mounting groove 3741 of the second shield 374. In this way, the stationary contact 373 abuts against the groove wall of the third step portion 3712 and the mounting groove 3741 under the action of the elastic member 375, so as to achieve reliable installation of the stationary contact 373.

[0077] In one embodiment, see Figure 2 and Figure 12The three-link transmission device 20 includes a first transmission mechanism 21 and a second transmission mechanism 22. The first transmission mechanism 21 includes a first connecting rod 212, a second connecting rod 213, and a first transmission crank arm 211. The second transmission mechanism 22 includes a third connecting rod 222, a fourth connecting rod 223, and a second transmission crank arm 221. Both the first transmission crank arm 211 and the second transmission crank arm 221 are provided with a first connecting portion 2112 and a second connecting portion 2114. One end of the first connecting rod 212 and the third connecting rod 222 are used to connect to the insulating pull rod 12 through the first connecting shaft 25. The first connecting rod 212 and the third connecting rod 222 are respectively spaced apart along the axial direction of the first connecting shaft 25. The other ends of the first connecting rod 212 and the third connecting rod 222 are rotatably connected to the first connecting portion 2112 of the first transmission crank arm 211 and the second transmission crank arm 221, respectively. One end of the second link 213 and the fourth link 223 are respectively used to connect the moving end pull rods 365 of the first arc-extinguishing chamber 33 and the second arc-extinguishing chamber 34, and the other end of the second link 213 and the fourth link 223 are respectively rotatably connected to the second connecting part 2114 of the first transmission crank arm 211 and the second transmission crank arm 221. In use, the insulating pull rod 12 moves along its axial direction under the action of external force, thereby driving the first connecting rod 212 and the third connecting rod 222 to move. The first transmission crank arm 211 and the second transmission crank arm 221 rotate under the action of the first connecting rod 212 and the third connecting rod 222, respectively, so that the second connecting rod 213 and the fourth connecting rod 223 drive the moving end pull rod 365 of the first arc-extinguishing chamber 33 and the second arc-extinguishing chamber 34 to move along their axial direction. In this way, one insulating pull rod 12 can simultaneously drive the moving end pull rod 365 of the first arc-extinguishing chamber 33 and the second arc-extinguishing chamber 34 to move synchronously, with good synchronization. Furthermore, through the first transmission mechanism 21 and the second transmission mechanism 22, the stroke output by the insulating pull rod 12 can be converted into the stroke of the moving end pull rod 365, realizing the closing and opening of the first arc-extinguishing chamber 33 and the second arc-extinguishing chamber 34. The first connecting rod 212 and the third connecting rod 222 are respectively spaced apart along the axial direction of the first connecting shaft 25 so that the first connecting parts 2112 of the first transmission crank arm 211 and the second transmission crank arm 221 are staggered, which can avoid installation and transmission interference; the second connecting rod 213 and the fourth connecting rod 223 are respectively rotatably connected to the second connecting parts 2114 of the first transmission crank arm 211 and the second transmission crank arm 221 to realize the control of the moving end pull rod 365 of the first arc-extinguishing chamber 33 and the second arc-extinguishing chamber 34.

[0078] In one embodiment, see Figure 12 and Figure 13Both the first transmission crank arm 211 and the second transmission crank arm 221 include a crank arm plate, and the crank arm plate has a first recessed area 2111. The first recessed area 2111 of the first transmission crank arm 211 is recessed from the side of the crank arm plate facing the second transmission crank arm 221 in a direction away from the second transmission crank arm 221, and the first recessed area 2111 of the second transmission crank arm 221 is recessed from the side of the crank arm plate facing the first transmission crank arm 211 in a direction away from the first transmission crank arm 211. The first connecting portion 2112 is located in the first recessed area 2111. In this way, it is advantageous for the opposite sides of the second connecting portion 2114 of the first transmission crank arm 211 and the opposite sides of the second connecting portion 2114 of the second transmission crank arm 221 to be located on the same plane. In addition, it is also advantageous to reduce the distance between the first transmission crank arm 211 and the second transmission crank arm 221, thereby reducing the volume of the three-way transmission device 20.

[0079] Further, see Figure 12 and Figure 13 The crank arm plate also has a second recessed area 2113. The second recessed area 2113 of the first transmission crank arm 211 is recessed from the side of the crank arm plate away from the second transmission crank arm 221 towards the side closer to the second transmission crank arm 221, and the second recessed area 2113 of the second transmission crank arm 221 is recessed from the side of the crank arm plate away from the first transmission crank arm 211 towards the side closer to the first transmission crank arm 211. The second connecting part 2114 is located in the second recessed area 2113, and the opposite sides of the second connecting part 2114 of the first transmission crank arm 211 and the second transmission crank arm 221 are respectively located on the same plane. It should be noted that the opposite sides of the second connecting part 2114 are respectively located on two opposite plate surfaces of the crank arm plate. In this way, the moving end pull rods 365 of the first arc-extinguishing chamber 33 and the second arc-extinguishing chamber 34 are coaxially arranged, realizing the control of the moving end pull rods 365 of the first arc-extinguishing chamber 33 and the second arc-extinguishing chamber 34.

[0080] In one embodiment, see Figure 12 and Figure 13The crank plates of the first transmission crank arm 211 and the second transmission crank arm 221 each include a first side 2115, a second side 2116, and a third side 2117 connected in sequence. The first side 2115 and the second side 2116, the second side 2116 and the third side 2117, and the third side 2117 and the first side 2115 are all arranged at included angles. Specifically, the crank plate is a triangular plate. The first recessed area 2111 is located at the end of the included angle formed by the first side 2115 and the third side 2117, and the second recessed area 2113 is located at the end of the included angle formed by the second side 2116 and the third side 2117. Thus, since the first side 2115 and the second side 2116, the second side 2116 and the third side 2117, and the third side 2117 and the first side 2115 are all set at included angles, the first side 2115, the second side 2116 and the third side 2117 are connected in sequence to form a triangular crank plate. The triangular crank plate has good stability, which can enhance the bending resistance of the first side 2115 and the second side 2116 and help extend the service life of the first side 2115 and the second side 2116.

[0081] Further, see Figure 12 The triple-drive device 20 also includes a housing 26 for installation between the first arc-extinguishing chamber 33 and the second arc-extinguishing chamber 34, with the first drive mechanism 21 and the second drive mechanism 22 disposed within the housing 26. The first drive crank arm 211 and the second drive crank arm 221 are further provided with a third connecting portion 2118, located at the included angle formed by the first side 2115 and the second side 2116, and the third connecting portion 2118 is rotatably connected to the housing 26. Furthermore, the triple-drive device 20 also includes a second connecting shaft 27, with the housing 26 having a first shaft hole and the third connecting portion 2118 having a second shaft hole, the second connecting shaft 27 being inserted into both the first and second shaft holes. In use, the insulating pull rod 12 moves along its axial direction to drive the first connecting rod 212 and the third connecting rod 222 to move. The first transmission crank arm 211 and the second transmission crank arm 221 rotate around the second connecting shaft 27 under the drive of the first connecting rod 212 and the third connecting rod 222, respectively. This allows the second connecting rod 213 and the fourth connecting rod 223 to drive the moving end pull rod 365 of the first arc-extinguishing chamber 33 and the second arc-extinguishing chamber 34 to move along their axial direction, thereby realizing the closing and opening of the first arc-extinguishing chamber 33 and the second arc-extinguishing chamber 34.

[0082] Specifically, the end of the insulating rod 12 away from the triple transmission device 20 is provided with a drive mechanism 80, such as a hydraulic operating mechanism. The drive mechanism 80 is driven to connect with the insulating rod 12 to drive the insulating rod 12 to move along its axial direction.

[0083] Furthermore, see Figure 12 and Figure 13The first transmission crank arm 211 and the second transmission crank arm 221 each have a starting position and an ending position. The first transmission crank arm 211 and the second transmission crank arm 221 are capable of rotating around the second connecting shaft 27 between the starting position and the ending position; wherein the included angle between the starting position and the ending position is 60°. It can be understood that the rotation angle of the first transmission crank arm 211 and the second transmission crank arm 221 is 60°. Thus, the first transmission crank arm 2111 and the second transmission crank arm 221 form an equilateral triangle from the starting position to the ending position. The length of the first side 2115 of the first transmission crank arm 211 and the second transmission crank arm 221 is consistent with the stroke of the insulating pull rod 12, and the length of the second side 2116 is consistent with the stroke of the moving end pull rod 365. To make it easy for a drive mechanism 80 to be adapted to a triple transmission device 20 with different strokes, only the second side 2116 needs to be changed to the required length. At the same time, to make it easy for a triple transmission device 20 to be adapted to a drive mechanism 80 with different strokes, only the first side 2115 needs to be changed to match the stroke of the drive mechanism 80.

[0084] In one embodiment, see Figure 12 and Figure 13 Both the first connecting rod 212 and the third connecting rod 222 include a first rod body 2121, a first connecting lug 2122, and a second connecting lug 2123. The first connecting lug 2122 and the second connecting lug 2123 are respectively connected to the two ends of the first rod body 2121. The first connecting lug 2122 has a third shaft hole, and the second connecting lug 2123 has a fourth shaft hole. The triple-drive device 20 also includes a third connecting shaft and a fourth connecting shaft. The third connecting shaft is used to insert into the third shaft hole and the insulating pull rod 12. The first connecting part 2112 has a fifth shaft hole, and the fourth connecting shaft passes through the fourth shaft hole and the fifth shaft hole. In this way, the first transmission crank arm 211 and the second transmission crank arm 221 are rotatably connected to the insulating pull rod 12 through the first connecting rod 212 and the third connecting rod 222 with the above structure.

[0085] Furthermore, two second connecting ears 2123 are provided, and the two second connecting ears 2123 are connected to the end of the first rod body 2121 away from the first connecting ear 2122, opposite to each other and spaced apart. The first connecting part 2112 is provided between the two second connecting ears 2123. Each of the two second connecting ears 2123 is provided with a fourth shaft hole, and the fourth shaft hole of each of the two second connecting ears 2123 is opposite to a fifth shaft hole. The fourth connecting shaft passes through the fourth shaft hole and the fifth shaft hole of the two second connecting ears 2123. In this way, a firm connection can be achieved between the first connecting rod 212 and the first transmission crank arm 211, and a firm connection can be achieved between the third connecting rod 222 and the second transmission crank arm 221.

[0086] In one embodiment, see Figure 12 and Figure 4Both the second connecting rod 213 and the fourth connecting rod 223 include a second rod body 2131, a third connecting lug 2132, and a fourth connecting lug 2133. The third connecting lug 2132 and the fourth connecting lug 2133 are respectively connected to the two ends of the second rod body 2131. The third connecting lug 2132 has a sixth shaft hole, and the fourth connecting lug 2133 has a seventh shaft hole. The second connecting part 2114 has an eighth shaft hole. The triple transmission device 20 also includes a fifth connecting shaft and a sixth connecting shaft. The fifth connecting shaft is used to pass through the sixth shaft hole and the moving end pull rod 365. The sixth connecting shaft passes through the seventh shaft hole and the eighth shaft hole. Thus, the first transmission crank arm 211 is connected to the moving end pull rod 365 of the first arc-extinguishing chamber 33 through the second connecting rod 213 of the above structure, and the second transmission crank arm 221 is connected to the moving end pull rod 365 of the second arc-extinguishing chamber 34 through the fourth connecting rod 223 of the above structure.

[0087] Furthermore, two third connecting ears 2132 are provided, and the two third connecting ears 2132 are connected to one end of the second rod 2131 opposite to each other and spaced apart. The moving end pull rod 365 is provided between the two third connecting ears 2132, and each of the two third connecting ears 2132 is provided with a sixth shaft hole. The fifth connecting shaft passes through the moving end pull rod 365 and the sixth shaft hole of the two third connecting ears 2132. Two fourth connecting ears 2133 are provided, and the two fourth connecting ears 2133 are connected to the other end of the second rod 2131 opposite to each other and spaced apart. The second connecting part 2114 is provided between the two fourth connecting ears 2133, and each of the two fourth connecting ears 2133 is provided with a seventh shaft hole. The sixth connecting shaft passes through the eighth shaft hole and the seventh shaft hole of the fourth connecting ear 2133. In this way, the second connecting rod 213 can be firmly connected to the moving end pull rod 365 of the first arc-extinguishing chamber 33 and the first transmission crank arm 211, respectively, and the fourth connecting rod 223 can be firmly connected to the moving end pull rod 365 of the second arc-extinguishing chamber 34 and the second transmission crank arm 221, respectively.

[0088] In one embodiment, the line connecting the center of the second shaft hole and the center of the fifth shaft hole is the first connecting line, and the line connecting the center of the second shaft hole and the center of the eighth shaft hole is the second connecting line. The length of the first connecting line is 100mm–260mm, the length of the second connecting line is 150mm–350mm, and the included angle between the first and second connecting lines is 90°. It is understood that the center-to-center distance between the second and fifth shaft holes is 100mm–260mm, and the center-to-center distance between the second and eighth shaft holes is 150mm–350mm. In this way, the vertical movement of the insulating rod 12 can be converted into the horizontal movement of the first arc-extinguishing chamber 33 and the second arc-extinguishing chamber 34, resulting in a smaller stroke for the insulating rod 12 and a larger stroke for the first and second arc-extinguishing chambers 33 and 34, thereby improving arc-extinguishing efficiency.

[0089] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0090] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0091] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0092] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0093] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0094] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0095] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A DC high-speed switch, characterized in that, include: Insulating posts; A three-stage transmission device is driven and connected to the insulating column. A first arc-extinguishing chamber and a second arc-extinguishing chamber are respectively located on opposite sides of the triple-drive device and are respectively driven and connected to the triple-drive device; each of the first and second arc-extinguishing chambers includes a first insulating sleeve and a moving end pull rod, the moving end pull rod being movably disposed within the first insulating sleeve and driven and connected to the triple-drive device; and The first shielding cover has a spherical structure and covers at least the three-way transmission device; the first shielding cover is positioned between the umbrella skirts of the first insulating sleeve of the first arc-extinguishing chamber and the second arc-extinguishing chamber.

2. The DC high-speed switch according to claim 1, characterized in that, The DC high-speed switch further includes a first equalizing ring and a second equalizing ring. The first equalizing ring is installed at the end of the first insulating sleeve of the first arc-extinguishing chamber away from the moving end pull rod. The second equalizing ring is installed at the end of the first insulating sleeve of the second arc-extinguishing chamber away from the moving end pull rod. The axial direction of the first equalizing ring and the second equalizing ring is the same as the axial direction of the first insulating sleeve.

3. The DC high-speed switch according to claim 2, characterized in that, The diameter of both the first equalizing ring and the second equalizing ring is 2000mm to 2400mm, and the thickness of both the first equalizing ring and the second equalizing ring is 400mm to 600mm.

4. The DC high-speed switch according to claim 1, characterized in that, The first insulating sleeve includes a tube body and an outer skirt sleeve fitted onto the tube body, wherein the outer skirt sleeve is a silicone rubber sleeve; The umbrella skirt outer cover includes a first umbrella skirt and a second umbrella skirt, which are alternately arranged along the axial direction of the tube body. The length of the first umbrella skirt is greater than the length of the second umbrella skirt. The upward tilt angle of the first umbrella skirt and the second umbrella skirt is both 5° to 35°, and the difference in length between the first umbrella skirt and the second umbrella skirt is greater than or equal to 15mm.

5. The DC high-speed switch according to claim 1, characterized in that, The lengths of the first and second arc-extinguishing chambers along their axial directions are both 2600mm to 3100mm.

6. The DC high-speed switch according to any one of claims 1 to 5, characterized in that, The insulating column includes a second insulating sleeve and an insulating tie rod. The insulating tie rod is movably disposed inside the second insulating sleeve and is drivenly connected to the three-way transmission device. The insulating column also includes a shielding ring, which is located inside the second insulating sleeve and sleeved on the end where the insulating pull rod and the three-way transmission device are connected; the outer circumferential surface of the shielding ring is provided with an adsorption structure for absorbing moisture in the gas.

7. The DC high-speed switch according to claim 6, characterized in that, The insulating column is provided in at least two, and all the insulating columns are coaxially arranged. Each insulating column also includes a connecting flange installed at the end of the second insulating sleeve, and the connecting flanges of two adjacent insulating columns are connected and fitted together. The insulating column also includes an insulating guide plate, which is disposed inside the second insulating sleeve and sandwiched between the connecting flanges of two adjacent insulating columns. The insulating guide plate has a through hole adapted to the insulating tie rod, and the insulating tie rod is inserted into the through hole.

8. The DC high-speed switch according to claim 7, characterized in that, The connecting flange includes a flange and a neck connected to the flange, the neck being sleeved on the end of the second insulating sleeve; the flange includes a first disc portion and a second disc portion connected to the first disc portion, the first disc portion and the second disc portion being located on the outer and inner sides of the neck respectively, the first disc portions of two adjacent insulating columns are fixedly connected by a connector, and the insulating guide disc is sandwiched between the second disc portions of two adjacent insulating columns; The second disc portion has a first step portion on the side opposite to the neck. The first step portions of the second disc portions of two adjacent insulating columns cooperate to form a limiting groove, and the edge of the insulating guide disc is located in the limiting groove.

9. The DC high-speed switch according to claim 7, characterized in that, The insulating column also includes an insulating pad, which is disposed between the insulating guide plate and the insulating tie rod.

10. The DC high-speed switch according to claim 6, characterized in that, The DC high-speed switch also includes a bracket and a drive mechanism mounted on the bracket, the drive mechanism being driven connected to the end of the insulating pull rod away from the three-way transmission device.

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