A direct-insertion double-isolation vacuum high-voltage switchgear

Abstract

The present invention relates to the technical field of high-voltage switch cabinets, and particularly to a direct-insertion double-isolation vacuum high-voltage switchgear. A busbar row and an upper contact box module fixed on the upper partition board are provided in the busbar chamber. The busbar row is connected to a contact seat in the upper contact box module through an upper contact box row; a trolley frame and a circuit breaker-disconnector combined electrical component module arranged in the trolley frame are provided in the switch chamber. The trolley frame is movably arranged on the middle partition board through rollers provided at its bottom; a lower contact box module fixed to the bottom of the middle partition board is provided in the cable chamber. By integrating the circuit breaker-disconnector combined electrical component module on the trolley frame, the trolley frame can be conveniently withdrawn from the cabinet body for maintenance and repair operations. Moreover, during the maintenance and repair operations, the upper contact arm and the lower contact arm can be correspondingly moved to positions isolated from the upper contact box module and the lower contact box module to ensure safety.

Description

Technical Field

[0001] The present invention relates to the technical field of high-voltage switch cabinets, and particularly to a direct-insert dual-isolation vacuum high-voltage switchgear. Background Art

[0002] The KYN 28 metal-clad medium-voltage switch cabinet is a relatively advanced 10KV high-voltage switch cabinet at present. This product has mature technology and is mainly applicable to power systems with alternating current of 50Hz and voltages of 3 - 12KV. The cabinet body is refined by advanced processing techniques and is widely used for control and monitoring in the power distribution system of power plant auxiliary power, the main switch of small and medium-sized generators, power distribution in industrial and mining enterprises and institutions, the transmission and distribution switchgear of substations in power systems, and the starting of large high-voltage motors, etc.

[0003] However, the disadvantage of KYN 28 is that the overall cabinet is huge. For example, KYN 28 - 10 uses three-phase copper bars of 100mm×10mm arranged horizontally. Considering factors such as the need for a safety distance greater than 125mm from the box body and between phases, and in addition to the operating space for the handcart, a test position also needs to be reserved. Therefore, the overall dimensions of the machine are 1.5m in depth, 0.8m in width, and 2.2m in height, with a volume of 2.64m 3 . The large overall cabinet volume consumes a lot of materials, and the space requirements for the customer's power distribution room also increase accordingly. Summary of the Invention

[0004] In order to at least partially solve the above and other potential problems, the purpose of the embodiments of the present invention is to provide a direct-insert dual-isolation vacuum high-voltage switchgear.

[0005] In order to achieve the above purpose, the present invention provides a direct-insert dual-isolation vacuum high-voltage switchgear, including a cabinet body, which is divided into a busbar chamber, a switch chamber, and a cable chamber from top to bottom via an upper partition board and a middle partition board;

[0006] The busbar chamber is provided with a busbar and an upper contact box module fixed on the upper partition board, and the busbar is connected to the contact seat in the upper contact box module through an upper contact box row;

[0007] The switch chamber is provided with a handcart frame and a circuit breaker-disconnector combined electrical component module arranged in the handcart frame, and the handcart frame is movably arranged on the middle partition board through rollers provided at its bottom;

[0008] The cable chamber is provided with a lower contact box module fixed at the bottom of the middle partition board;

[0009] The circuit breaker-disconnector combined electrical appliance component module includes a single-phase vacuum circuit breaker-disconnector combined encapsulated pole column. An upper contact arm and a lower contact arm that can move up and down are installed inside the single-phase vacuum circuit breaker-disconnector combined encapsulated pole column. Among them, the upper contact arm can move upward to contact the contact seat in the upper contact box module, and the lower contact arm can move downward to contact the contact seat in the lower contact box module.

[0010] Optionally, both the upper contact box module and the lower contact box module include a contact box. A contact seat and a plum blossom contact holder sleeved on the contact seat are provided inside the contact box. Plum blossom contact pieces are arranged at intervals along the circumferential direction of the plum blossom contact holder. Spring fingers are provided on the plum blossom contact pieces to form an open interface for the contact arm to be inserted and connected to the contact seat.

[0011] A contact box row is connected to the contact seat, and the other end of the contact box row extends out of the contact box.

[0012] Optionally, insulating boards are respectively fixed on one side surface of the switch chamber for the upper partition board and the middle partition board. First through holes are opened on the insulating boards corresponding to the upper partition board and the middle partition board, and the first through holes correspond to the through holes on the upper partition board or the middle partition board to respectively allow the upper contact arm or the lower contact arm to pass through.

[0013] A contact box cover plate is provided on the side of the insulating board away from the upper partition board or the middle partition board, and a second through hole corresponding to the first through hole is provided on the contact box cover plate.

[0014] An inclined slide plate is provided on the handcart frame. When the handcart frame is moved out of the switch chamber, the contact box cover plate is pushed by the slide plate so that the second through hole and the first through hole are in an avoidance position.

[0015] When the handcart frame is moved into the switch chamber, the contact box cover plate can be reset so that the second through hole and the first through hole are in an aligned position for the upper contact arm or the lower contact arm to pass through.

[0016] Optionally, a strip-shaped limit hole perpendicular to the moving direction of the handcart frame is provided on the contact box cover plate, and a limit post extending vertically is provided on the middle partition board to form a guiding and limiting fit with the strip-shaped limit hole.

[0017] Optionally, a spring seat is further provided on the middle partition board. A spring is provided between the spring seat and the contact box cover plate. When the handcart frame is moved out of the switch chamber and pushes the contact box cover plate to move, the spring is compressed.

[0018] The elastic force of the spring can push the contact box cover plate to reset when the handcart frame is moved into the switch chamber so that the second through hole and the first through hole are in an aligned position for the lower contact arm to pass through.

[0019] Optionally, a guide wheel is provided between the slide plate and the contact box cover plate to form a rolling guide fit.

[0020] Optionally, the single-phase vacuum circuit breaker isolating switch combination sealed pole comprises a vacuum circuit breaker combination and an isolating switch moving contact combination;

[0021] The vacuum circuit breaker assembly comprises a vacuum interrupter located in the middle, wherein the upper end of the vacuum interrupter is provided with a first conductive block, and the lower end of the vacuum interrupter is provided with a second conductive block and an insulating pull rod;

[0022] The movable contact assembly of the isolating switch includes an upper contact arm and a lower contact arm that can move up and down. A first driving mechanism is provided in the trolley frame for driving the upper contact arm to move upward until it contacts the contact seat in the upper contact box module, and a second driving mechanism is provided for driving the lower contact arm to move downward until it contacts the contact seat in the lower contact box module.

[0023] Optionally, the circuit breaker disconnector combination electrical component module further comprises a main shaft rotatably arranged on the trolley frame, a crank arm is provided on the main shaft, and a suspension end of the crank arm is connected to the insulating pull rod.

[0024] Optionally, the first driving mechanism includes a driving motor arranged in the trolley frame, a first transmission shaft drivingly connected to an output shaft of the driving motor, and a second transmission shaft perpendicular to the first transmission shaft;

[0025] The first transmission shaft is provided with a first bevel gear arranged coaxially and meshing with a second bevel gear arranged at one end of the second transmission shaft. The other end of the second transmission shaft is provided with a third bevel gear which meshes with a fourth bevel gear rotatably arranged on the first conductive block. The fourth bevel gear is sleeved on the upper contact arm, and when the fourth bevel gear rotates forward or reversely, the upper contact arm is driven to move upward or downward.

[0026] Optionally, an insulating bracket is further connected to the sealed pole of the single-phase vacuum circuit breaker disconnector combination, and a supporting roller is provided at the bottom end of the insulating bracket to form a rolling fit with the upper plate surface of the middle partition.

[0027] Compared with the prior art, the present invention has the following technical effects:

[0028] The plug-in double-isolation vacuum high-voltage switchgear provided by the present invention integrates the circuit breaker isolating switch combination electrical component module on the trolley frame, and the trolley frame can be conveniently pulled out of the cabinet for maintenance and overhaul operations. When performing maintenance and overhaul operations, the upper contact arm and the lower contact arm can be correspondingly moved to positions isolated from the upper contact box module and the lower contact box module to ensure safety.

[0029] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 FIG. 5 shows a schematic structural view of a direct - insertion double - isolation vacuum high - voltage switchgear with a partial housing omitted according to a specific embodiment of the present invention;

[0031] Figure 2 FIG. 1 shows a schematic structural view of a direct - insertion double - isolation vacuum high - voltage switchgear according to a specific embodiment of the present invention;

[0032] Figure 3 FIG. Figure 2 is a cross - sectional view of the direct - insertion double - isolation vacuum high - voltage switchgear in FIG.

[0033] Figure 4 FIG. Figure 3 is an enlarged schematic view of position A in FIG.

[0034] Figure 5 FIG. Figure 3 is an enlarged schematic view of position B in FIG.

[0035] Figure 6 FIG. 10 shows a schematic view of a valve mechanism according to a specific embodiment of the present invention;

[0036] Figure 7 FIG. Figure 6 is a schematic view of the valve mechanism from another perspective in FIG.

[0037] Figure 8 FIG. 11 shows an exploded schematic view of the upper contact box module located in the bus chamber;

[0038] Description of reference numerals in the figures: 10, cabinet body; 101, busbar chamber; 102, switch chamber; 103, cable chamber; 11, upper partition board; 12, middle partition board; 122, limit post; 123, spring seat; 20, busbar; 21, upper contact box row; 30, upper contact box module; 31, contact seat; 32, contact box; 33, plum blossom contact support; 34, plum blossom contact piece; 35, spring finger; 40, trolley frame; 401, roller; 41, circuit breaker disconnector combined electrical component module; 42, single-phase vacuum circuit breaker disconnector combined solid-sealed pole column; 421, upper contact arm; 422, lower contact arm; 423, vacuum circuit breaker combination; 4231, vacuum interrupter; 4232, first conductive block; 4233, second conductive block; 4234, insulating pull rod; 43, slide plate; 44, main shaft; 441, crank arm; 45, driving motor; 46, first transmission shaft; 461, first bevel gear; 47, second transmission shaft; 471, second bevel gear; 472, third bevel gear; 473, fourth bevel gear; 48, insulating support; 481, support roller; 50, lower contact box module; 60, bakelite board; 601, first through hole; 61, contact box cover plate; 611, second through hole; 612, strip-shaped limit hole; 613, spring; 614, guide wheel. Detailed implementation manners

[0039] In order to make the technical means, creative features, achieved purposes and functions of the present invention easy to understand, the present invention will be further clarified below with reference to specific drawings.

[0040] It should be noted that in the present invention, when an element is referred to as being "fixed to" another element, it can be directly on the other element or there can also be an intermediate 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 intermediate element at the same time.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the description of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0042] As described above, in combination with Figure 1 、 2 shown, the present invention provides a direct-insertion double-isolation vacuum high-voltage switchgear, which includes a cabinet body 10. The cabinet body 10 is divided into a busbar chamber 101, a switch chamber 102 and a cable chamber 103 from top to bottom via an upper partition board 11 and a middle partition board 12;

[0043] Inside the busbar chamber 101, there are busbars 20 and an upper contact box module 30 fixed on the upper partition plate 11. The busbars 20 are connected to the contact seat 31 in the upper contact box module 30 through the upper contact box busbars 21;

[0044] Inside the switch chamber 102, there is a trolley frame 40 and a circuit breaker-disconnector combined electrical component module 41 arranged inside the trolley frame 40. The trolley frame 40 is movably arranged on the middle partition plate 12 through the rollers 401 provided at its bottom;

[0045] Inside the cable chamber 103, there is a lower contact box module 50 fixed at the bottom of the middle partition plate 12;

[0046] The circuit breaker-disconnector combined electrical component module 41 includes a single-phase vacuum circuit breaker-disconnector combined solid-sealed pole column 42. Inside the single-phase vacuum circuit breaker-disconnector combined solid-sealed pole column 42, there are an upper contact arm 421 and a lower contact arm 422 that can move up and down. Among them, the upper contact arm 421 can move upward to contact the contact seat 31 in the upper contact box module 30, and the lower contact arm 422 can move downward to contact the contact seat 31 in the lower contact box module 50.

[0047] For the switchgear provided by the present invention, by integrating the circuit breaker-disconnector combined electrical component module 41 on the trolley frame 40, the trolley frame 40 can be conveniently withdrawn from the cabinet body 10 for maintenance and repair operations. And during the maintenance and repair operations, the upper contact arm 421 and the lower contact arm 422 can correspondingly move to positions isolated from the upper contact box module 30 and the lower contact box module 50 to ensure safety.

[0048] In the present invention, based on the upper partition plate 11 and the middle partition plate 12, the cabinet body 10 of the entire switchgear is modularly designed, with a simple structure, which is conducive to automated assembly line production and manufacturing, and greatly reduces the production and manufacturing costs.

[0049] In some embodiments, as shown in combination with Figure 3 、 4 、8, both the upper contact box module 30 and the lower contact box module 50 include a contact box 32. Inside the contact box 32, there are a contact seat 31 and a plum blossom contact bracket 33 sleeved on the contact seat 31. Along the circumferential direction of the plum blossom contact bracket 33, there are plum blossom contact pieces 34 arranged at intervals. On the plum blossom contact pieces 34, there are spring contact fingers 35 to form an open-shaped interface for the contact arm to insert and connect to the contact seat 31; a contact box busbar is connected to the contact seat 31, and the other end of the contact box busbar extends out of the contact box 32.

[0050] Specifically, in combination with the foregoing, in the upper contact box module 30, an upper contact box row 21 is connected to the contact base 31 and extends outside the contact box 32 through the upper contact box row 21 to be connected to the bus bar row 20.

[0051] In some embodiments, in order to improve the restraint effect of the spring fingers 35 on the plum blossom contact pieces 34, multiple spring fingers 35 are arranged at intervals along the length direction of the plum blossom contact pieces 34, such as Figure 4 , 8 As shown, four spring fingers 35 are arranged at intervals along the length direction of the plum blossom contact pieces 34.

[0052] In some embodiments, an ear is provided at one end of the plum blossom contact piece 34 close to the contact base 31 to contact with the annular recess on the contact base 31, and reliable fixation is achieved in cooperation with the restraint of the spring fingers 35. The other ends of multiple plum blossom contact pieces 34 enclose to form an open-shaped interface for the contact arm to be inserted and then connected to the contact base 31.

[0053] In some embodiments, the contact base 31 extends upward with a connecting column fixedly connected to the contact box 32.

[0054] In some embodiments, insulating boards 60 are respectively fixed on one side surface of the switch chamber 102 where the upper partition board 11 and the middle partition board 12 are located. First through holes 601 are formed in the insulating boards 60 corresponding to the upper partition board 11 and the middle partition board 12 respectively, and the first through holes 601 correspond to the through holes on the upper partition board 11 or the middle partition board 12 to respectively allow the upper contact arm 421 or the lower contact arm 422 to pass through;

[0055] On the side of the insulating board 60 away from the upper partition board 11 or the middle partition board 12, a contact box cover plate 61 is provided, and a second through hole 611 corresponding to the first through hole 601 is provided on the contact box cover plate 61; here, that is, an insulating board 60 is provided at the bottom of the upper partition board 11, and an insulating board 60 is also provided at the upper part of the middle partition board 12, and contact box cover plates 61 are provided on the opposite sides of the two insulating boards 60.

[0056] The handcart frame 40 is provided with inclined sliding plates 43, and when the handcart frame 40 is moved out of the switch chamber 102, the contact box cover plate 61 is pushed by the sliding plates 43 so that the second through hole 611 and the first through hole 601 are in an avoidance position; in order to push the two contact box cover plates 61, two sliding plates 43 are provided.

[0057] When the handcart frame 40 is moved into the switch chamber 102, the contact box cover plate 61 can be reset so that the second through hole 611 and the first through hole 601 are in an aligned position for the upper contact arm 421 or the lower contact arm 422 to pass through.

[0058] The shutter mechanism formed by combining the above-mentioned phenolic resin board 60 and the touch box cover plate 61, when the trolley frame 40 is moved out of the switch room 102, the touch box cover plate 61 is pushed by the sliding plate 43 to make the second through hole 611 and the first through hole 601 in a staggered state, avoiding the upper contact arm 421 passing through the upper partition 11 or the lower contact arm 422 passing through the middle partition 12 due to misoperation, ensuring safety.

[0059] The following specifically describes with the shutter mechanism composed of the phenolic resin board 60 and the touch box cover plate 61 provided on the middle partition 12: Combined Figure 6 、 7 As shown, the phenolic resin board 60 is fixed on one side surface of the middle partition 12 adjacent to the switch room 102. A first through hole 601 is preset on the middle partition 12 to be aligned with a through hole preset on the middle partition 12 to allow the lower contact arm 422 to pass through and contact the contact seat 31 provided in the lower contact box module 50;

[0060] A touch box cover plate 61 is movably arranged above the phenolic resin board 60, and a second through hole 611 corresponding to the first through hole 601 is provided on the touch box cover plate 61;

[0061] When the trolley frame 40 is pulled outwards, the sliding plate 43 provided on the trolley frame 40 pushes the touch box cover plate 61 to make the second through hole 611 and the first through hole 601 in a staggered position; at this time, the lower contact arm 422 will not be able to pass through the middle partition 12;

[0062] When the trolley frame 40 is moved into the switch room 102 again, the touch box cover plate 61 can be reset to make the second through hole 611 and the first through hole 601 in an aligned position for the lower contact arm 422 to pass through.

[0063] In some embodiments, a strip-shaped limit hole 612 perpendicular to the moving direction of the trolley frame 40 is provided on the touch box cover plate 61, and a limit post 122 extending vertically is provided on the middle partition 12 to form a guiding and limiting fit with the strip-shaped limit hole 612.

[0064] Through the cooperation of the limit post 122 and the strip-shaped limit hole 612 on the touch box cover plate 61, it is ensured that the touch box cover plate 61 moves more efficiently to make the second through hole 611 and the first through hole 601 in a staggered position state.

[0065] In some embodiments, in order to ensure that the touch box cover plate 61 can be better reset when the trolley frame 40 is moved into the switch room 102 again, a spring seat 123 is further provided on the middle partition 12. A spring 613 is provided between the spring seat 123 and the touch box cover plate 61, and when the trolley frame 40 is moved out of the switch room 102 and pushes the touch box cover plate 61 to move, the spring 613 is compressed;

[0066] The elastic force of the spring 613 can push the contact box cover 61 to return to its original position when the trolley frame 40 moves into the switch chamber 102 , so that the second through hole 611 and the first through hole 601 are aligned to allow the lower contact arm 422 to pass through.

[0067] More preferably, the contact box cover 61 is further provided with a guide column movably inserted on the spring seat 123, and the spring 613 is sleeved on the guide column to ensure that it is more stable in the process of storing elastic potential energy.

[0068] In some embodiments, a guide wheel 614 is provided between the slide plate 43 and the contact box cover plate 61 to form a rolling guide fit.

[0069] In this way, the sliding friction between the contact box cover plate 61 and the slide plate 43 is configured as rolling friction, which improves the effectiveness of the slide plate 43 pushing the contact box cover plate 61 to move when the trolley frame 40 moves; in a more specific solution, combined with Figure 7 As shown, the guide wheels 614 are rotatably arranged on the contact box cover plate 61, and in order to improve the pushing effect, at least two guide wheels 614 are arranged at intervals.

[0070] In some embodiments, the single-phase vacuum circuit breaker isolating switch combination sealed pole 42 includes a vacuum circuit breaker combination 423 and an isolating switch moving contact combination; the vacuum circuit breaker combination 423 includes a vacuum interrupter 4231 located in the middle, and the vacuum interrupter 4231 has a first conductive block 4232 at the upper end and a second conductive block 4233 and an insulating pull rod 4234 at the lower end;

[0071] The movable contact assembly of the isolating switch includes an upper contact arm 421 and a lower contact arm 422 that can move up and down. A first driving mechanism is provided in the trolley frame 40 for driving the upper contact arm 421 to move upward until it contacts the contact seat 31 in the upper contact box module 30, and a second driving mechanism is provided for driving the lower contact arm 422 to move downward until it contacts the contact seat 31 in the lower contact box module 50.

[0072] Furthermore, combined Figure 5 , 6 As shown, the first driving mechanism includes a driving motor 45 arranged in the handcart frame 40, a first transmission shaft 46 drivingly connected to the output shaft of the driving motor 45, and a second transmission shaft 47 perpendicular to the first transmission shaft 46;

[0073] A first bevel gear 461 arranged coaxially is provided on the first transmission shaft 46 and meshes with a second bevel gear 471 provided at one end of a second transmission shaft 47. A third bevel gear 472 is provided at the other end of the second transmission shaft 47 and meshes with a fourth bevel gear 473 rotatably arranged on a first conductive block 4232. The fourth bevel gear 473 is sleeved on the upper contact arm 421, and when the fourth bevel gear 473 rotates forward or backward, it drives the upper contact arm 421 to move upward or downward.

[0074] In some embodiments, the circuit breaker-disconnector combined electrical appliance component module 41 further includes a main shaft 44 rotatably arranged on the handcart frame 40. A crank arm 441 is provided on the main shaft 44, and the suspended end of the crank arm 441 is connected to the insulating pull rod 4234.

[0075] In some embodiments, an insulating support 48 is further connected to the single-phase vacuum circuit breaker-disconnector combined solid-sealed pole column 42. A support roller 481 is provided at the bottom end of the insulating support 48 and forms a rolling fit with the upper plate surface of the middle partition plate 12.

[0076] The foregoing shows and describes the basic principles, main features and characteristics of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of the present invention claimed is defined by the appended claims and their equivalents.

Claims

1. A direct-insertion double-isolation vacuum high-voltage switchgear, characterized in that, It includes a cabinet body (10), and the cabinet body (10) is divided into a busbar chamber (101), a switch chamber (102) and a cable chamber (103) from top to bottom via an upper partition board (11) and a middle partition board (12); A busbar (20) and an upper contact box module (30) fixed on the upper partition board (11) are arranged in the busbar chamber (101), and the busbar (20) is connected to a contact seat (31) in the upper contact box module (30) through an upper contact box row (21); A trolley frame (40) and a circuit breaker-disconnector combined electrical component module (41) arranged in the trolley frame (40) are arranged in the switch chamber (102), and the trolley frame (40) is movably arranged on the middle partition board (12) through rollers (401) arranged at its bottom; A lower contact box module (50) fixed at the bottom of the middle partition board (12) is arranged in the cable chamber (103); The circuit breaker-disconnector combined electrical component module (41) includes a single-phase vacuum circuit breaker-disconnector combined encapsulated pole column (42), and an upper contact arm (421) and a lower contact arm (422) that can move up and down are installed in the single-phase vacuum circuit breaker-disconnector combined encapsulated pole column (42). Among them, the upper contact arm (421) can move upward to contact the contact seat (31) in the upper contact box module (30), and the lower contact arm (422) can move downward to contact the contact seat (31) in the lower contact box module (50); Insulating boards (60) are respectively fixed on one side surface of the switch chamber (102) of the upper partition board (11) and the middle partition board (12). First through holes (601) are formed in the insulating boards (60) corresponding to the upper partition board (11) and the middle partition board (12). The first through holes (601) correspond to through holes on the upper partition board (11) or the middle partition board (12) to respectively allow the upper contact arm (421) or the lower contact arm (422) to pass through; A contact box cover plate (61) is arranged on the side of the insulating board (60) away from the upper partition board (11) or the middle partition board (12), and a second through hole (611) corresponding to the first through hole (601) is formed on the contact box cover plate (61); An inclined slide plate (43) is arranged on the trolley frame (40), and when the trolley frame (40) is moved out of the switch chamber (102), the contact box cover plate (61) is pushed by the slide plate (43) to make the second through hole (611) and the first through hole (601) in an avoidance position; When the trolley frame (40) is moved into the switch chamber (102), the contact box cover plate (61) can be reset to make the second through hole (611) and the first through hole (601) in an aligned position for the upper contact arm (421) or the lower contact arm (422) to pass through; A strip-shaped limiting hole (612) perpendicular to the moving direction of the trolley frame (40) is formed on the contact box cover plate (61), and a limiting column (122) extending vertically is arranged on the middle partition board (12) to form a guiding and limiting fit with the strip-shaped limiting hole (612); A spring seat (123) is also provided on the middle partition plate (12), a spring (613) is provided between the spring seat (123) and the contact box cover plate (61), and when the trolley frame (40) moves out of the switch chamber (102) and pushes the contact box cover plate (61) to move, the spring (613) is compressed; The elastic force of the spring (613) can push the contact box cover (61) to reset when the trolley frame (40) moves into the switch chamber (102), so that the second through hole (611) and the first through hole (601) are aligned to allow the lower contact arm (422) to pass through; A guide wheel (614) is provided between the slide plate (43) and the contact box cover plate (61) to form a rolling guide fit.

2. The direct-insertion double-isolation vacuum high-voltage switchgear according to claim 1, characterized in that, The upper contact box module (30) and the lower contact box module (50) both comprise a contact box (32), wherein a contact seat (31) and a plum blossom contact bracket (33) sleeved on the contact seat (31) are provided in the contact box (32), the plum blossom contact bracket (33) is provided with plum blossom contact pieces (34) arranged at intervals along its circumference, and the plum blossom contact pieces (34) are provided with spring contact fingers (35) to form an open interface for the contact arm to be inserted and connected to the contact seat (31); The contact seat (31) is connected to a contact box row, and the other end of the contact box row extends out of the contact box (32).

3. The through-hole dual-isolation vacuum high-voltage switchgear according to claim 1, wherein The single-phase vacuum circuit breaker isolating switch assembly sealed pole (42) comprises a vacuum circuit breaker assembly (423) and an isolating switch moving contact assembly; The vacuum circuit breaker assembly (423) comprises a vacuum interrupter (4231) located in the middle, wherein the upper end of the vacuum interrupter (4231) is provided with a first conductive block (4232), and the lower end of the vacuum interrupter (4231) is provided with a second conductive block (4233) and an insulating pull rod (4234); The isolating switch movable contact assembly comprises an upper contact arm (421) and a lower contact arm (422) that can move up and down. A first driving mechanism is provided in the trolley frame (40) for driving the upper contact arm (421) to move upward to contact with a contact seat (31) in an upper contact box module (30), and a second driving mechanism is provided for driving the lower contact arm (422) to move downward to contact with a contact seat (31) in a lower contact box module (50).

4. The direct-insertion double-isolation vacuum high-voltage switchgear according to claim 3, characterized in that The circuit breaker disconnect switch combination electrical component module (41) also includes a main shaft (44) rotatably arranged on the trolley frame (40), and a crank arm (441) is provided on the main shaft (44), and the hanging end of the crank arm (441) is connected to the insulating pull rod (4234).

5. The direct-insertion double-isolation vacuum high-voltage switchgear according to claim 3, characterized in that, The first driving mechanism comprises a driving motor (45) arranged in the trolley frame (40), a first transmission shaft (46) drivingly connected to an output shaft of the driving motor (45), and a second transmission shaft (47) perpendicular to the first transmission shaft (46); A first bevel gear (461) arranged coaxially on the first transmission shaft (46) meshes with a second bevel gear (471) arranged at one end of the second transmission shaft (47). A third bevel gear (472) is arranged at the other end of the second transmission shaft (47) and meshes with a fourth bevel gear (473) rotatably arranged on the first conductive block (4232). The fourth bevel gear (473) is sleeved on the upper contact arm (421). When the fourth bevel gear (473) rotates forward or backward, it drives the upper contact arm (421) to move upward or downward.

6. The through-hole dual-isolation vacuum high-voltage switchgear according to claim 1, wherein, An insulating support (48) is further connected to the single-phase vacuum circuit breaker disconnector combined solid-insulated pole (42). A support roller (481) is arranged at the bottom end of the insulating support (48) and is in rolling cooperation with the upper plate surface of the middle partition plate (12).

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