Top-expanded gas-insulated switchgear switch

Abstract

The utility model provides an inflatable cabinet switch with an expanded top. The inflatable cabinet switch comprises a gas tank, a first wiring pipe, a second wiring pipe and a switch assembly arranged in the gas tank, the switch assembly comprises an isolation switch which is driven by the driving shaft to rotate, two ends of the isolation switch are bent, and the two ends of the isolation switch are conductive ends respectively; the solid-sealed polar pole is conductively connected with one end of the first wiring tube; the first isolation contact is arranged on one side of the periphery of the isolation switch, the first isolation contact is conductively connected with the solid-sealed polar pole, and the outer side of the first isolation contact is covered with a first insulation cover; the second isolating contact is arranged on the upper side of the periphery of the isolating switch and is conductively connected with one end of the second wiring pipe, a second insulating cover covers the outer side of the second isolating contact, and the first insulating cover and the second insulating cover are arranged in a way corresponding to the side opening of the autorotation path of the isolating switch; and the grounding contact is arranged on the other side of the periphery of the isolating switch. The vertical moving space of the isolating switch can be reduced, and the vertical height and the manufacturing cost of the gas tank are reduced.

Description

Technical Field

[0001] The utility model relates to the field of gas-insulated switchgear, in particular to a gas-insulated switchgear with a top extension. Background Art

[0002] The gas-insulated switchgear is a very important power distribution equipment in the power system and is widely used in urban distribution networks, enterprises and other fields.

[0003] The existing layout of the gas-insulated switchgear in the gas tank generally uses a linear disconnector to switch between the three working positions of switch closed position, switch grounding position, and switch open position. For example, in a prior application named an improved electrical switch with the application number 202410056453.X, the isolating contacts, isolating blades, and pole columns in the gas tank are distributed from top to bottom in sequence. The lower end of the isolating blade is connected to the pole column through a transfer conductor, and the upper end swings to conductively connect the disconnector, grounding contact, or be suspended to achieve the switching of the three working positions. However, such a layout has the defect that the vertical moving space of the disconnector is large, resulting in a higher height of the gas tank and a higher manufacturing cost of the gas tank.

[0004] Designing a gas-insulated switchgear with a top extension to solve the problems existing in the above-mentioned prior art is the purpose of the research of the present utility model. Summary of the Utility Model

[0005] In view of the problems existing in the above-mentioned prior art, the present utility model provides a gas-insulated switchgear with a top extension, which can effectively solve the problems existing in the above-mentioned prior art.

[0006] The technical solution of the present utility model is as follows:

[0007] A gas-insulated switchgear with a top extension includes: a gas tank, a first wiring pipe and a second wiring pipe whose one ends are hermetically penetrated into the gas tank, and a switch assembly arranged in the gas tank; the switch assembly includes:

[0008] A disconnector, which is rotatably arranged by being driven by a driving shaft, and is bent between two ends thereof and the two ends are respectively set as conductive ends;

[0009] A solid-sealed pole column, which is conductively connected to one end of the first wiring pipe;

[0010] A first isolating contact, which is arranged on one side of the outer periphery of the disconnector, the first isolating contact is conductively connected to the solid-sealed pole column and a first insulating cover is sleeved outside;

[0011] A second isolating contact, which is arranged on the upper side of the outer periphery of the disconnector and is conductively connected to one end of the second wiring pipe, a second insulating cover is sleeved outside the second isolating contact, and the first insulating cover and the second insulating cover are provided with openings on the side corresponding to the rotation path of the disconnector to make way;

[0012] The grounding contact is arranged on the other side of the outer periphery of the disconnector; the disconnector is used for self-rotating to electrically connect the two conductive ends to the first isolation contact and the second isolation contact respectively, or to electrically connect the first isolation contact and the grounding contact respectively, or to be suspended.

[0013] Further, the number of the driving shafts is set to one, and it rotates through a side wall of the air box and then is rotationally connected to brackets arranged on two opposite inner walls of the air box. The number of the switch assemblies is three and they are arranged side by side along the length direction of the driving shaft. The bent parts of the disconnectors of the three switch assemblies are sleeved on the driving shaft side by side at intervals. The solid-sealed pole columns of the three switch assemblies are sequentially set as the phase A pole column, the phase B pole column, and the phase C pole column. Both the first wiring pipe and the second wiring pipe have three and respectively correspond to the three switch assemblies.

[0014] Further, the solid-sealed pole column is horizontally arranged on one side of the outer periphery of the disconnector. The first isolation contact and the first insulating cover are arranged at one end of the solid-sealed pole column close to the disconnector. Inside the solid-sealed pole column, a vacuum interrupter is sequentially arranged in the direction away from the first isolation contact, and an insulating pull rod that is driven horizontally by an external driving device and has one end inserted into the moving end of the vacuum interrupter through a moving end conductor. A static end conductor is arranged through the side wall of the static end of the vacuum interrupter, with one end electrically connected to the first isolation contact and the other end corresponding to one end of the insulating pull rod. The moving end conductor is connected with a flexible connection whose one end is linked with the insulating pull rod, and the other end of the flexible connection is electrically connected to one end of the first wiring pipe.

[0015] Further, the second wiring pipe includes a second sleeve that is hermetically penetrated through the top of the air box and a second conductor that is inserted into the second sleeve. The second insulating cover is arranged at the bottom of the second sleeve. The lower end of the second conductor penetrates into the second insulating cover. An insulating ring that surrounds the outer periphery of the lower end of the second conductor is convexly arranged downward in the second insulating cover. The second isolation contact is arranged at the lower end of the second conductor.

[0016] Further, a conductive part is convexly arranged downward at the bottom of the solid-sealed pole column. A connecting conductor is vertically penetrated through the conductive part. The other end of the flexible connection is electrically screwed to the upper end of the connecting conductor. The first wiring pipe includes a first sleeve, a first conductor that is inserted into the first sleeve, and an insulating sleeve whose upper and lower ends are respectively hermetically inserted into the conductive part and the upper end of the first sleeve. The upper end of the first sleeve is pressed by a sleeve pressing plate against the bottom of the air box, and the lower end extends downward and then is horizontally folded. A sealing ring is arranged between the upper end of the first sleeve and the air box for sealing. The upper end of the first conductor is electrically inserted into the jack of the connecting conductor, and the upper end of the first conductor, the insulating sleeve, and the sealing ring are distributed from inside to outside in sequence.

[0017] Furthermore, the outer layer of the insulating sleeve is set as a semiconductor shielding layer, the upper and lower ends of the insulating sleeve are set as sealing parts whose side wall thickness gradually decreases in opposite directions, the conductive part and the upper end of the first sleeve are respectively provided with sealing holes adapted to the sealing parts, and the middle thickness of the insulating sleeve is laterally expanded to form an insulating part that is arranged between the conductive part and the upper end of the first sleeve.

[0018] Furthermore, the bracket is made of insulating elastic material.

[0019] Furthermore, the second isolating contact, the grounding contact, and the first isolating contact are respectively arranged on the upper side, the rear side, and the front side of the isolating switch; the first insulating cover and the second insulating cover are both set as rectangular shells; the top and rear openings of the first insulating cover are set; the bottom and front openings of the second insulating cover are set; the bottom of the first insulating cover is offset downward and is set as a making way for the isolating switch to rotate to the two conductive ends to respectively connect the first isolating contact and the grounding contact in an electrically conductive manner; the rear part of the second insulating cover extends downward and is set as a blocking part for blocking the isolating switch from rotating to the two conductive ends to respectively connect the second isolating contact and the grounding contact in an electrically conductive manner.

[0020] Therefore, the utility model provides the following effects and / or advantages:

[0021] 1. By setting the isolating switch to rotate driven by the driving shaft and bend between the two conductive ends, and setting the first isolating contact, the second isolating contact, and the grounding contact on the outer periphery of the isolating switch, the isolating switch is rotated to the switch closed position where the two conductive ends are respectively conductively connected to the first isolating contact and the second isolating contact, or the switch grounding position where the two conductive ends are respectively conductively connected to the first isolating contact and the grounding contact, or the switch open position where the two conductive ends are suspended. Thus, the linear isolating switch is replaced with a bent isolating switch to reduce the vertical activity space of the isolating switch, reduce the vertical space inside the gas box required for the installation of the switch assembly, and reduce the vertical height of the gas box and the manufacturing cost; and, since the bending setting of the isolating switch shortens the distance between the two conductive ends, which in turn shortens the distance between the first isolating contact and the second isolating contact, there is an insulation hazard, therefore, the first isolating contact and the second isolating contact are insulated and isolated by the first insulating cover and the second insulating cover respectively, to reduce the risk of insulation hazard caused by shortened distance.

[0022] 2. By directly conducting electricity through the static terminal conductor, the first isolating contact is arranged at the static end of the vacuum interrupter, eliminating the need for transfer conductors such as busbars to transfer electricity between the first isolating contact and the solid-sealed pole column. This further reduces the vertical space inside the gas tank required for installing the switch assembly, decreases the vertical height of the gas tank and manufacturing costs. At the same time, it also reduces the usage amount of copper materials, reduces connection points, lowers the loop resistance, and reduces the risk points of insulation breakdown inside the gas tank. Specifically, compared with conventional gas-insulated switchgear, the height of the gas tank can be reduced by about 60%. The gas tank is a standard cuboid with a simple structure, facilitating manufacturing. The usage amount of copper conductors is reduced by more than 30%, enhancing the insulation performance and reducing product costs.

[0023] 3. On the premise of achieving insulation protection through the second insulating cover, the second isolating contact is directly arranged at the lower end of the second conductor, eliminating the need for connection through copper conductor transfer. This further reduces the usage amount of copper conductor materials, reduces connection points, and reduces the risk points of insulation breakdown inside the gas tank.

[0024] 4. The bracket is made of insulating elastic material, enabling the bracket to have insulation performance and a certain degree of elasticity. Thus, on the basis of supporting the drive shaft through the bracket, the bracket can also play a role in enhancing insulation and providing a certain amount of elastic compensation for the deformation of the gas tank.

[0025] 5. Through the cooperation of the bushing pressing plate and the sealing ring, the upper end of the first bushing is hermetically connected to the gas tank. And on the basis of achieving electrical connection between the first wiring pipe and the solid-sealed pole column through the conductive insertion connection of the first conductor and the moving terminal conductor, insulation protection is realized through the internal and external settings of the first conductor and the insulating sleeve, improving safety.

[0026] It should be understood that the above summary and the following detailed description of the present invention are exemplary and explanatory, and are intended to provide further explanation of the present invention as claimed. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic structural diagram of a gas-insulated switchgear with a top-expanded gas tank after removing the rear and side shells.

[0028] Figure 2 It is a schematic sectional view of a gas-insulated switchgear with a top-expanded gas tank, where the disconnector is in the closed position of the switch, and the second wiring pipe, disconnector, first isolating contact, second isolating contact, grounding contact, and insulating push rod are not sectioned.

[0029] Figure 3 For Figure 2 It is a partial structural schematic diagram of the solid-sealed pole column, first isolating contact, and first wiring pipe in

[0030] Figure 4 For Figure 2Partial structural schematic diagram of the second isolating contact and the second wiring pipe

[0031] Figure 5 is Figure 2 Structural schematic diagram when the disconnector in [device name] is in the switch-connected position

[0032] Figure 6 is Figure 2 Structural schematic diagram when the disconnector in [device name] is in the switch-disconnected position Detailed implementation manners

[0033] For the convenience of those skilled in the art to understand, the embodiments will now be combined with the accompanying drawings to further describe the structure of the present invention in detail:

[0034] Refer to Figure 1-6 , an inflatable cabinet switch with a top extension, including: an air box 1, a first wiring pipe 2 and a second wiring pipe 3 with one end sealed and penetrating into the air box 1, and a switch assembly 4 provided in the air box 1; the switch assembly 4 includes:

[0035] A disconnector 41, rotatably arranged by being driven by a driving shaft 5, bent between both ends of the disconnector 41 and both ends are respectively set as conductive ends 411; specifically, the disconnector 41 is an isolating knife with both ends arranged coplanarly, the middle of the disconnector 41 is bent, and the included angle between both ends of the disconnector 41 is an obtuse angle, and the driving shaft 5 is driven to rotate by an external rotation driving device;

[0036] A solid-sealed pole column 42, electrically connected to one end of the first wiring pipe 2;

[0037] A first isolating contact 43, arranged on one side of the outer periphery of the disconnector 41, the first isolating contact 43 is electrically connected to the solid-sealed pole column 42 and is covered with a first insulating cover 421 on the outside;

[0038] A second isolating contact 44, arranged on the upper side of the outer periphery of the disconnector 41 and electrically connected to one end of the second wiring pipe 3, the second isolating contact 44 is covered with a second insulating cover 31 on the outside, and the first insulating cover 421 and the second insulating cover 31 are arranged with openings on the side corresponding to the rotation path of the disconnector 41 to make way;

[0039] The grounding contact 45 is arranged on the other side of the outer periphery of the isolating switch 41; the isolating switch 41 is used to rotate to the switch closed position where the two conductive ends 411 are respectively conductively connected to the first isolating contact 43 and the second isolating contact 44, or the switch grounded position where the two conductive ends 411 are respectively conductively connected to the first isolating contact 43 and the grounding contact 45, or the switch open position where the two conductive ends 411 are suspended. Specifically, the grounding contact 45 is fixed to the inner wall of the gas box 1 through a grounding angle steel, and the conductive connection described in the context of this embodiment can be a strap contact finger, a spring contact finger, an elastic fit or other methods.

[0040] The arrangement of the above-mentioned structure replaces the linear isolating switch 41 with a bent isolating switch 41 to reduce the vertical activity space of the isolating switch 41, thereby reducing the vertical space inside the gas box 1 required for the installation of the switch assembly 4, and reducing the vertical height and manufacturing cost of the gas box 1; and, since the isolating switch 41 is bent, the distance between the two conductive ends 411 is shortened, which in turn causes the distance between the first isolating contact 43 and the second isolating contact 44 to be shortened, which may easily lead to insulation hazards. Therefore, the first isolating contact 43 and the second isolating contact 44 are insulated and isolated by the first insulating cover 421 and the second insulating cover 31 respectively, so as to reduce the risk of insulation hazards caused by shortened distance.

[0041] Specifically, the number of the driving shafts 5 is set to one, and it rotates through one side wall of the air box 1 and then rotates to connect to the brackets 6 arranged on the two opposite inner walls of the air box 1. The number of the switch assemblies 4 is set to three groups and they are arranged side by side along the length direction of the driving shaft 5. The bending parts of the isolating switches 41 of the three groups of the switch assemblies 4 are arranged side by side and spaced on the driving shaft 5. The sealed poles 42 of the three groups of the switch assemblies 4 are respectively set as A-phase poles 46, B-phase poles 47 and C-phase poles 48. The first wiring tubes 2 and the second wiring tubes 3 are each provided with three and correspond to the three groups of the switch assemblies 4 respectively. The outer layer of the isolating switch 41 is wrapped with insulating material, the cross-section of the driving shaft 5 is set to a polygon, and the outer linkage sleeve of the driving shaft 5 is provided with an insulating cylinder with an inner hole cross-section adapted thereto. The three isolating switches 41 are fixedly sleeved on the outside of the insulating cylinder, thereby providing insulation protection between the driving shaft 5 and the isolating switch 41. In addition, the bracket 6 is made of an insulating elastic material so that the bracket 6 has insulating properties and a certain elasticity. Therefore, on the basis of supporting the drive shaft 5 through the bracket 6, the bracket 6 can also play a role in strengthening insulation and performing a certain amount of elastic compensation for the deformation of the air box 1.

[0042] In the existing gas-insulated switchgear, the first disconnector 41 is electrically connected to the moving end of the vacuum interrupter 422 inside the solid-sealed pole column 42 through a flexible connection 426. Since the flexible connection 426 is linked with the laterally movable insulating pull rod 423, a copper conductor inside the branch busbar is required to transfer the electrical connection between the first disconnector 41 and the flexible connection 426 to achieve electrical conductivity stability. Such an arrangement not only makes the space occupied by the branch busbar large, but also results in a large amount of copper used, further increasing the cost. A large number of copper conductors are arranged in the gas tank 1, increasing the risk points of insulation breakdown.

[0043] Therefore, to solve the above problems, the solid-sealed pole column 42 is horizontally arranged on one side of the outer periphery of the disconnector 41. The first isolating contact 43 and the first insulating cover 421 are arranged at one end of the solid-sealed pole column 42 close to the disconnector 41. Inside the solid-sealed pole column 42, a vacuum interrupter 422 and an insulating pull rod 423 that is driven laterally by an external driving device and has one end inserted into the moving end of the vacuum interrupter 422 through a moving-end conductor 424 are sequentially arranged in the direction away from the first isolating contact 43. Specifically, the other end of the insulating pull rod 423 penetrates the side wall of the gas tank 1 in a sealed manner and is connected to the external driving device. A static-end conductor 425, whose one end is electrically connected to the first isolating contact 43 and the other end corresponds to one end of the insulating pull rod 423, penetrates the side wall of the static end of the vacuum interrupter 422. The moving-end conductor 424 is connected to a flexible connection 426 whose one end is linked with the insulating pull rod 423. The other end of the flexible connection 426 is electrically connected to one end of the first wiring pipe 2. Specifically, in this embodiment, all the conductors mentioned in the context can be made of copper conductors. Thus, by directly electrically connecting the first isolating contact 43 to the static end of the vacuum interrupter 422 through the static-end conductor 425, there is no need for a transfer conductor such as a branch busbar to transfer the electrical connection between the first isolating contact 43 and the solid-sealed pole column 42, further reducing the vertical space inside the gas tank 1 required for the installation of the switch assembly 4, reducing the vertical height and manufacturing cost of the gas tank 1. At the same time, it also reduces the amount of copper used, reduces the connection points, reduces the loop resistance, and reduces the risk points of insulation breakdown in the gas tank 1. Specifically, compared with the conventional gas-insulated switchgear, the height of the gas tank 1 can be reduced by about 60%. The gas tank 1 is a standard cuboid with a simple structure, which is convenient for manufacturing. The amount of copper conductor used is reduced by more than 30%, enhancing the insulation performance and reducing the product cost.

[0044] In order to further reduce the usage amount of copper conductors, the second wiring pipe 3 includes a second sleeve 32 hermetically penetrating through the top of the air tank 1 and a second conductor 33 disposed within the second sleeve 32. The second insulating cover 31 is disposed at the bottom of the second sleeve 32. The lower end of the second conductor 33 penetrates into the second insulating cover 31. An insulating ring 311 surrounding the outer periphery of the lower end of the second conductor 33 is convexly provided downward within the second insulating cover 31. The second isolating contact 44 is disposed at the lower end of the second conductor 33. Thus, on the premise of achieving insulation protection through the second insulating cover 31, the second isolating contact 44 is directly disposed at the lower end of the second conductor 33, without the need for connection through a copper conductor transfer, further reducing the usage amount of copper conductors, reducing connection points, and reducing the risk points of insulation damage within the air tank 1.

[0045] In order to achieve the sealing between the first wiring pipe 2 and the air tank 1 and the electrical connection between the first wiring pipe 2 and the solid-sealed pole column 42, a conductive portion 427 is convexly provided downward at the bottom of the solid-sealed pole column 42. A connecting conductor 428 is vertically penetrated within the conductive portion 427. The other end of the flexible connection 426 is electrically screwed to the upper end of the connecting conductor 428. The first wiring pipe 2 includes a first sleeve 21, a first conductor 22 disposed within the first sleeve 21, and an insulating sleeve 23 with upper and lower ends hermetically inserted into the conductive portion 427 and the upper end of the first sleeve 21 respectively. Specifically, the insulating sleeve 23 is a silica gel sleeve. A shielding net is provided on the inner wall of the first sleeve 21. The first sleeve 21 and the first conductor 22 are solid-sealed as a whole. The upper end of the first sleeve 21 is pressed against the bottom of the air tank 1 by a sleeve pressing plate 24 and is laterally folded after extending downward at the lower end. The upper end of the first sleeve 21 and the air tank 1 are hermetically provided through a sealing ring 25. The upper end of the first conductor 22 is electrically inserted into the jack of the connecting conductor 428. The upper end of the first conductor 22, the insulating sleeve 23, and the sealing ring 25 are distributed in sequence from the inside to the outside. Thus, through the cooperation of the sleeve pressing plate 24 and the sealing ring 25, the upper end of the first sleeve 21 is hermetically connected to the air tank 1, and on the basis of achieving the electrical connection between the first wiring pipe 2 and the solid-sealed pole column 42 through the electrical insertion connection between the first conductor 22 and the moving-end conductor 424, insulation protection is achieved through the internal and external settings of the first conductor 22 and the insulating sleeve 23, improving safety.

[0046] In order to improve the insulation protection stability of the insulating sleeve 23 after the conductive connection between the first conductor 22 and the moving end conductor 424, the outer layer of the insulating sleeve 23 is set as a semiconductor shielding layer, the upper and lower ends of the insulating sleeve 23 are set as sealing parts 231 whose side wall thickness gradually decreases in opposite directions, the conductive part 427 and the upper end of the first sleeve 21 are respectively provided with sealing holes adapted to the sealing parts 231, and the middle thickness of the insulating sleeve 23 is expanded laterally to form an insulating part 232 disposed between the conductive part 427 and the upper end of the first sleeve 21. Specifically, the cross-sections of the upper and lower ends of the insulating sleeve 23, the conductive part 427 and the sealing hole in the upper end of the first sleeve 21 are all set as cones, so that the upper and lower ends of the insulating sleeve 23 and the corresponding sealing holes are sealed and attached through the cone surface, and the conductive part 427 is isolated from contacting the upper end side wall of the first sleeve 21 by the setting of the insulating part 232, thereby improving the insulation protection stability.

[0047] In order to improve the safety of operating the isolating switch 41 to rotate, the second isolating contact 44, the grounding contact 45, and the first isolating contact 43 are respectively arranged on the upper side, the rear side, and the front side of the isolating switch 41; the first insulating cover 421 and the second insulating cover 31 are both set as rectangular shells; the top and rear openings of the first insulating cover 421 are set; the bottom and front openings of the second insulating cover 31 are set; the bottom of the first insulating cover 421 is offset downward and is set as a giving portion 4211 for making way for the isolating switch 41 to rotate to the two conductive ends 411 to respectively connect the first isolating contact 43 and the grounding contact 45 conductively; the rear part of the second insulating cover 31 extends downward and is set as a blocking portion 312 for blocking the isolating switch 41 from rotating to the two conductive ends 411 to respectively connect the second isolating contact 44 and the grounding contact 45 conductively; specifically, the first conductor 22 in the first wiring tube 2 is conductively connected to the outgoing line, and the second conductor 33 in the second wiring tube 3 is conductively connected to the incoming line. Therefore, by setting the blocking part 312, the isolating switch 41 can only be switched between the three positions of switch closed position, switch grounded position and switch open position, so as to avoid the isolating switch 41 rotating to the two conductive ends 411 to respectively connect the second isolating contact 44 and the grounding contact 45, resulting in the error of incoming line grounding, thereby improving the safety of operating the isolating switch 41 to rotate.

[0048] The above description is only the preferred implementation of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. An inflatable cabinet switch with an extended top, characterized in that Including: An air box (1), a first wiring pipe (2) and a second wiring pipe (3) with one end sealed and penetrating into the air box (1), and a switch assembly (4) arranged in the air box (1); the switch assembly (4) includes: A disconnector (41), rotatably arranged under the drive of a drive shaft (5), with a bent setting between both ends of the disconnector (41) and both ends respectively set as conductive ends (411); A solid-sealed pole column (42), electrically connected to one end of the first wiring pipe (2); A first isolating contact (43), arranged on one side of the outer periphery of the disconnector (41), the first isolating contact (43) is electrically connected to the solid-sealed pole column (42) and is covered with a first insulating cover (421) on the outside; A second isolating contact (44), arranged on the upper side of the outer periphery of the disconnector (41) and electrically connected to one end of the second wiring pipe (3), the second isolating contact (44) is covered with a second insulating cover (31) on the outside, and the first insulating cover (421) and the second insulating cover (31) are arranged with openings on the side corresponding to the rotation path of the disconnector (41) to make way; A grounding contact (45), arranged on the other side of the outer periphery of the disconnector (41); the disconnector (41) is used to rotate so that the two conductive ends (411) are respectively electrically connected to the first isolating contact (43) and the second isolating contact (44), or are respectively electrically connected to the first isolating contact (43) and the grounding contact (45), or are suspended.

2. The top-expanded gas-insulated switchgear switch according to claim 1, wherein, The number of the drive shafts (5) is set to one, and it rotates through one side wall of the air box (1) and then is rotatably connected to brackets (6) arranged on two opposite inner walls of the air box (1). The number of the switch assemblies (4) is three and they are arranged side by side along the length direction of the drive shaft (5). The bent parts of the disconnectors (41) of the three switch assemblies (4) are sleeved on the drive shaft (5) side by side at intervals. The solid-sealed pole columns (42) of the three switch assemblies (4) are successively set as a phase pole column (46), a b phase pole column (47) and a c phase pole column (48). Both the first wiring pipe (2) and the second wiring pipe (3) have three and respectively correspond to the three switch assemblies (4).

3. The inflatable cabinet switch with a top extension as described in claim 1, characterized in that, The encapsulated pole column (42) is horizontally arranged on one side of the outer periphery of the disconnecting switch (41). The first isolating contact (43) and the first insulating cover (421) are arranged at one end of the encapsulated pole column (42) close to the disconnecting switch (41). Inside the encapsulated pole column (42), a vacuum interrupter (422) and an insulating pull rod (423) which is driven by an external driving device to move horizontally and one end of which is inserted into the moving end of the vacuum interrupter (422) through a moving end conductor (424) are sequentially arranged in a direction away from the first isolating contact (43). A static end conductor (425) whose one end is electrically connected to the first isolating contact (43) and the other end corresponds to one end of the insulating pull rod (423) penetrates through the side wall of the static end of the vacuum interrupter (422). The moving end conductor (424) is connected with a flexible connection (426) whose one end is linked with the insulating pull rod (423), and the other end of the flexible connection (426) is electrically connected to one end of the first wiring pipe (2).

4. A top-expanded gas-insulated switchgear switch as claimed in claim 1, wherein, The second wiring pipe (3) includes a second sleeve (32) hermetically penetrating through the top of the gas tank (1) and a second conductor (33) penetrating through the second sleeve (32). The second insulating cover (31) is arranged at the bottom of the second sleeve (32). The lower end of the second conductor (33) penetrates into the second insulating cover (31). An insulating ring (311) surrounding the outer periphery of the lower end of the second conductor (33) protrudes downward in the second insulating cover (31). The second isolating contact (44) is arranged at the lower end of the second conductor (33).

5. The inflatable cabinet switch with a top extension according to claim 3, characterized in that, A conductive part (427) protrudes downward from the bottom of the encapsulated pole column (42). A connecting conductor (428) vertically penetrates through the conductive part (427). The other end of the flexible connection (426) is electrically screwed to the upper end of the connecting conductor (428). The first wiring pipe (2) includes a first sleeve (21), a first conductor (22) penetrating through the first sleeve (21), and an insulating sleeve (23) whose upper and lower ends are respectively hermetically inserted into the conductive part (427) and the upper end of the first sleeve (21). The upper end of the first sleeve (21) is pressed against the bottom of the gas tank (1) by a sleeve pressing plate (24) and is horizontally folded after extending downward at the lower end. A sealing ring (25) is arranged for sealing between the upper end of the first sleeve (21) and the gas tank (1). The upper end of the first conductor (22) is electrically inserted into the jack of the connecting conductor (428). The upper end of the first conductor (22), the insulating sleeve (23), and the sealing ring (25) are distributed in sequence from inside to outside.

6. The top-expanded gas-insulated switchgear switch according to claim 5, characterized in that, The outer layer of the insulating sleeve (23) is a semiconductor shielding layer. The upper and lower ends of the insulating sleeve (23) are sealing parts (231) whose side wall thickness gradually decreases in opposite directions. Sealing holes adapted to the sealing parts (231) are respectively arranged in the conductive part (427) and the upper end of the first sleeve (21). The thickness of the middle part of the insulating sleeve (23) expands horizontally outward to form an insulating part (232) abutted between the conductive part (427) and the upper end of the first sleeve (21).

7. The inflatable cabinet switch with a top extension according to claim 2, wherein, The bracket (6) is made of an insulating elastic material.

8. The inflatable cabinet switch with a top extension as claimed in claim 1, wherein, The second isolating contact (44), the grounding contact (45), and the first isolating contact (43) are respectively arranged on the upper side, the rear side, and the front side of the isolating switch (41); the first insulating cover (421) and the second insulating cover (31) are both arranged as rectangular parallelepiped shells; the top and rear of the first insulating cover (421) are opened, and the bottom and front of the second insulating cover (31) are opened; the bottom of the first insulating cover (421) is offset downward to form a giving portion (4211) for allowing the isolating switch (41) to rotate to the two conductive ends (411) to respectively connect the first isolating contact (43) and the grounding contact (45); the rear of the second insulating cover (31) extends downward to form a blocking portion (312) for blocking the isolating switch (41) from rotating to the two conductive ends (411) to respectively connect the second isolating contact (44) and the grounding contact (45).

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