CN217010108U

CN217010108U - Atmospheric sealed air insulation ring main unit

Info

Publication number: CN217010108U
Application number: CN202220536783.5U
Authority: CN
Inventors: 虞欧伦
Original assignee: Jiangxi Tuowang Electric Co ltd
Current assignee: Jiangxi Tuowang Electric Co ltd
Priority date: 2022-03-12
Filing date: 2022-03-12
Publication date: 2022-07-19
Anticipated expiration: 2032-03-12

Abstract

The utility model relates to an atmospheric-pressure sealed air-insulated ring main unit, which comprises an atmospheric-pressure switch sealed box, a pressure relief chamber, a cable chamber, a mechanism operating chamber, a three-phase vacuum switch unit and a three-position isolating switch, wherein the three-position isolating switch is matched with an isolating operating mechanism, the isolating operating mechanism drives the three-position isolating switch to perform switching action through an isolating main shaft mechanism, the three-phase vacuum switch unit is connected with an elastic operating mechanism through a switching-off and switching-on transmission mechanism, the top of a switch bracket of the three-phase vacuum switch unit is fixedly connected with a transmission mechanism box, a transmission mechanism mounting chamber and a side end chamber are arranged in the transmission mechanism mounting chamber, the elastic operating mechanism is mounted in the side end chamber and partially corresponds to the position of the mechanism operating chamber, a top assembling port is arranged at the top of the atmospheric-pressure switch sealed box, the three-phase vacuum switch unit is mounted in the atmospheric-pressure switch sealed box along the top assembling port, and the top assembling port is sealed and covered by a transmission mechanism box. Has the advantages of reasonable structural layout and compact structure.

Description

Atmospheric sealed air insulation ring main unit

Technical Field

The utility model relates to a ring main unit, in particular to a normal-pressure sealed air insulation ring main unit.

Background

The ring main unit is an electrical device which is formed by installing a group of high-voltage switch devices in a steel plate metal main unit body or manufacturing an assembled interval ring main unit. The air insulation ring network cabinet, also called a semi-insulation ring network cabinet, is widely used in distribution stations and box-type substations of load centers of urban residential districts, high-rise buildings, large public buildings, factory enterprises and the like due to the advantages of low cost, good insulation performance, environmental protection and the like. However, the conventional air-insulated ring main unit has the defects that the assembly and the maintenance of most of the conventional domestic air-insulated ring main units are inconvenient because the structural layout of the vacuum circuit breaker part is unreasonable, and the transmission mechanism for switching on and off operation of the vacuum circuit breaker is simultaneously arranged in the air box along with the three-phase vacuum circuit breaker unit, and the ring main unit has a large volume and cannot meet the increasingly severe size miniaturization requirement of the air-insulated ring main unit.

Disclosure of Invention

The utility model aims at: in order to overcome the defects in the prior art, the utility model provides the normal-pressure sealed air insulation ring main unit which is reasonable in structural layout and compact in structure.

In order to achieve the purpose, the utility model provides the following technical scheme:

the utility model provides a sealed air insulation looped netowrk cabinet of ordinary pressure, including the ordinary pressure switch seal box, pressure relief room and cable chamber have been arranged side by side to the ordinary pressure switch seal box bottom, the mechanism's control chamber has been arranged to the ordinary pressure switch seal box front side, three-phase vacuum switch unit and three-station isolator have been arranged in the ordinary pressure switch seal box, three-station isolator cooperation has isolation operating device, isolation operating device is through the three-station isolator switching action of isolation spindle mechanism drive, it is located the mechanism's control chamber to keep apart operating device, three-phase vacuum switch unit cooperation has divide-shut brake drive arrangement, divide-shut brake drive arrangement includes divide-shut brake drive mechanism and spring operation mechanism, its characterized in that: three-phase vacuum switch unit's switch support top fixedly connected with drive mechanism case has the drive mechanism installation room and is located the side room of drive mechanism installation room one end in the drive mechanism case, divide closing transmission mechanism to install in the drive mechanism installation room, and the mechanism is installed at the side indoor to the bullet operation, and the bullet operation mechanism part corresponds in mechanism operation room position, and the top of ordinary pressure switch seal box has the top assembly mouth, and three-phase vacuum switch unit is packed into the ordinary pressure switch seal box along the top assembly mouth in, and the top assembly mouth is through the sealed closing cap of drive mechanism case.

Through adopting above-mentioned technical scheme, vacuum switch unit top realizes integrated installation divide-shut brake drive arrangement through the drive mechanism case, the open-top hoist of the constant pressure switch seal box that can be convenient is put into the constant pressure switch seal box and is pulled down from the constant pressure switch seal box, be convenient for install and maintain, the drive mechanism case is shelved simultaneously and is put aside the top assembly mouth and carry out sealed closing cap to the top assembly mouth, compact structure's advantage has, realize the built-in constant pressure switch seal box of vacuum switch unit, and divide-shut brake drive arrangement to be located the drive mechanism incasement outside the constant pressure switch seal box, the maintenance operation of being convenient for, the size of constant pressure switch seal box can be fully utilized simultaneously, realize the compact installation of bullet behaviour mechanism, thereby make looped netowrk cabinet size miniaturized design.

Preferably, the switching transmission mechanism comprises a vacuum main shaft rotatably arranged in a transmission mechanism box, a switching spring connected to the vacuum main shaft and a vacuum switching connecting lever arranged on the vacuum main shaft, the vacuum switching connecting lever is linked and connected to an insulating pull rod of a vacuum switch unit, the spring operating mechanism is arranged in a side end chamber in a horizontal mode, the vacuum main shaft corresponds to the transverse middle position of the spring operating mechanism, the spring operating mechanism comprises a framework and an operating mechanism body arranged on the framework, the framework comprises an outer side mounting substrate and an inner side mounting substrate which are arranged oppositely and supported by a supporting shaft sleeve in the middle, the operating mechanism body is provided with a power input shaft, a first connecting lever driven by the power input shaft to swing is arranged on the power input shaft, the spring operating mechanism is arranged at one axial end position of the vacuum main shaft, and the power input shaft and the vacuum main shaft are arranged in the same axial direction, the mechanism frame on rotate and be provided with the mechanism power output transition axle of following power input shaft axial arrangement, mechanism power output transition axle has a power take off end, installs the second turning arm on the mechanism power output transition axle, the eccentric swing end of first turning arm articulates there is the transmission pull rod, and the transmission pull rod articulates on the second turning arm for the other end with the articulated one end of first turning arm, installs the third turning arm on the power output end of mechanism power output transition axle, and the third turning arm articulates there is the vacuum transfer line, is equipped with the articulated arm on the vacuum main shaft near the vacuum divide-shut brake turning arm of mechanism one side of manipulating, and the vacuum transfer line articulates on the articulated arm. Under the structural design, the spring operation mechanism adopts the design of a mechanism power output transition shaft to realize that the spring operation mechanism is horizontally arranged at a side end chamber of a transmission mechanism box and is driven by a vacuum transmission rod related transmission structure and a vacuum main shaft, so that the spring operation mechanism is more compactly arranged in the transmission mechanism box, and further the whole ring main unit is more compact in structure and more miniaturized in size.

Preferably, the isolation main shaft mechanism comprises an insulation main shaft supported in a normal pressure switch sealing box, an isolation crank arm is fixed on the insulation main shaft, the isolation crank arm is hinged with an isolation pull rod, the isolation pull rod is hinged in the middle of a moving knife of the three-station isolation switch, a closing energy storage assembly is mounted on the insulation main shaft and comprises an eccentric arm mounted on the insulation main shaft and rotationally linked with the insulation main shaft, an energy storage spring is matched with the eccentric end of the eccentric arm, a spring seat is arranged on the normal pressure switch sealing box, one end of the energy storage spring is positioned on the spring seat, the axis of the insulation main shaft corresponds to the straight line of the spring force of the energy storage spring when the insulation main shaft rotates to the opening station and completes energy storage, and the spring storage capacity is released when the insulation main shaft rotates clockwise and anticlockwise to cut out the opening station. Under the structural design, the insulating main shaft is directly matched with an energy storage spring through an eccentric arm to store energy when reaching a switching-off station, and the energy storage force of the spring realizes that the insulating main shaft enters isolation switching-on and grounding switching-on stations in a fast rotating mode.

Preferably, the energy storage spring is a helical compression spring, the eccentric arm is hinged with a spring positioning shaft, the spring positioning shaft is provided with a spring supporting plate, the energy storage spring is sleeved on the spring positioning shaft and supported on the spring supporting plate to form an eccentric end for jacking the eccentric arm, the spring seat is provided with a shaft retaining hole for the spring positioning shaft to pass through, and the spring positioning shaft is movably inserted in the shaft retaining hole relative to the other end of the end hinged with the eccentric arm. Under this structural design, helical compression spring one end is the application of force end that pushes away the eccentric arm, and the helical compression spring other end is the location fulcrum that the location supported on the spring holder, and helical compression spring application of force end is along with the eccentric end swing around the location fulcrum of eccentric arm, has simple structure compactness and moves reliable advantage.

Preferably, the isolation operating mechanism comprises a mechanism bracket, an isolation operating shaft, a grounding operating shaft, a transmission sliding plate, an isolation rotor assembly and a grounding rotor assembly, the mechanism bracket comprises a front side plate and a rear side plate, an assembly interval is arranged between the front side plate and the rear side plate, the transmission sliding plate is limited in the assembly interval to slide in a reciprocating linear manner in a preset stroke along the longitudinal direction, the isolation rotor assembly and the grounding rotor assembly are respectively arranged at the two transverse sides of the transmission sliding plate,

the transmission sliding plate is provided with an isolation switching-on station and a grounding switching-on station which respectively correspond to the tail ends of the two sliding strokes and a switching-off station which corresponds to the middle part of the sliding strokes in the sliding strokes, the transmission sliding plate is in transmission connection with the insulating main shaft, the two transverse sides of the transmission sliding plate are respectively provided with an isolation side linkage groove and a grounding side linkage groove, the isolation side linkage groove and the grounding side linkage groove respectively comprise pushing walls which are arranged at intervals along the sliding direction of the transmission sliding plate and avoiding intervals between the two pushing walls,

the isolation rotor assembly comprises an isolation rotor arranged on an isolation operating shaft, a first limiting part limiting the isolation rotor to rotate in a reciprocating manner in an isolation opening/closing stroke, and a first position maintaining assembly maintaining the position of the isolation rotor when the isolation rotor rotates to an isolation opening/closing position, the isolation rotor is provided with an isolation shifting arm correspondingly matched with the isolation side linkage groove to drive the transmission sliding plate to slide in a reciprocating manner between an opening station and an isolation closing station, the isolation shifting arm of the isolation rotor can extend into the isolation side linkage groove and is in pushing fit with two pushing walls of the isolation side linkage groove,

the grounding rotor assembly comprises a grounding rotor arranged on a grounding operating shaft, a second limiting part limiting the grounding rotor to rotate in a reciprocating manner in a grounding opening/closing stroke, and a second position maintaining assembly maintaining the position of the grounding rotor when the grounding rotor rotates to a grounding opening/closing position, the grounding rotor is provided with a grounding shifting arm correspondingly matched with the grounding side linkage groove to drive the transmission sliding plate to slide in a reciprocating manner between the opening station and the grounding closing station, and the grounding shifting arm of the grounding rotor can extend into the grounding side linkage groove and is in pushing fit with the tops of the two pushing walls of the grounding side linkage groove;

when the transmission sliding plate slides to the grounding switching-on station, the shifting end of the isolation shifting arm goes beyond the isolation side linkage groove and is stopped by the side wall of the transmission sliding plate to limit the isolation rotor to rotate and switch to the isolation switching-on station; when the transmission sliding plate slides to the isolation switching-on station, the shifting end of the grounding shifting arm goes beyond the grounding side linkage groove and is stopped by the side wall of the transmission sliding plate so as to limit the grounding rotor to rotate and switch to the grounding switching-on station. By adopting the technical scheme, when the brake is switched off, the stirring end of the isolation stirring arm of the isolation rotor extends into the isolation side linkage groove, the stirring end of the grounding stirring arm of the grounding rotor extends into the grounding side linkage groove, and during isolation switch-on operation, the isolation operation shaft is rotated to rotate the isolation rotor, so that the transmission sliding plate is stirred to slide to the isolation switch-on station, the insulation main shaft is driven to rotate, the switching of the driving movable brake knife is driven to enter the isolation switch-on position, the isolation switch-on operation is finished, and along with the sliding of the transmission sliding plate, the stirring end of the grounding stirring arm exceeds the grounding side linkage groove and is stopped by the side wall of the transmission sliding plate to limit the rotation switching of the grounding rotor to the grounding switch-on position, and grounding locking is realized; when the isolation brake-separating operation is carried out, the isolation operation shaft is reversely rotated; completing grounding switch-on and grounding switch-off operations in the same way; the thin design of the isolation operating mechanism is realized, so that the overall size of the ring main unit is reduced, the national standard requirements are better met, the structure is simple, and the operation is safe and reliable.

Preferably, a power input part is fixedly mounted at one end of the insulating main shaft, a transmission crank arm is arranged on the power input part, a supporting part is arranged on the front side plate, the power input part is rotatably supported on the supporting part, a transverse linkage groove extending along the transverse direction is arranged on the transmission sliding plate, a linkage shaft is arranged on the transmission crank arm, and the linkage shaft is limited in the transverse linkage groove so as to drive the power input part to rotate through the sliding of the transmission sliding plate. Under the structural design, the linkage structure of the insulating main shaft and the insulating main shaft is simple and reliable.

Preferably, the first position maintaining assembly comprises a first positioning rolling pin and a first rolling pin spring, the first positioning rolling pin is linearly matched on the mechanism support in a sliding manner along the radial direction of the isolation rotor, two positioning clamping grooves are formed in the outer circumferential side of the isolation rotor along the circumferential direction, and the first rolling pin spring provides a spring maintaining force for pressing the first positioning rolling pin against the outer circumferential surface of the isolation rotor, so that the first positioning rolling pin is forced to slide along with the rotation of the isolation rotor and is switched between the two positioning clamping grooves; the second position holding assembly comprises a second positioning rolling pin and a second rolling pin spring, the second positioning rolling pin is in linear sliding fit on the mechanism support along the radial direction of the grounding rotor, two positioning clamping grooves are formed in the outer circumferential side of the grounding rotor along the circumferential direction, and the second rolling pin spring provides spring holding force for pressing the second positioning rolling pin against the outer circumferential surface of the grounding rotor, so that the second positioning rolling pin is forced to slide along with the rotation of the grounding rotor and is switched between the two positioning clamping grooves. Under the structural design, a first positioning rolling pin is adopted to abut against the isolation rotor under the driving of a first rolling pin spring, and moves on the outer circumferential surface of the isolation rotor along with the rotation of the isolation rotor so as to enter and slide out of the two positioning clamping grooves, and the first positioning rolling pin is clamped into the positioning clamping grooves of the isolation rotor to realize the positioning and the holding of the isolation rotor; the positioning and the keeping of the grounding rotor are realized in the same way.

Preferably, the first rolling pin spring and the second rolling pin spring are both annular springs formed by winding of spiral springs, the first rolling pin spring surrounds the rotation central shaft of the isolation rotor and the first positioning rolling pin to drive the first positioning rolling pin to abut against the isolation rotor, and the second rolling pin spring surrounds the rotation central shaft of the grounding rotor and the second positioning rolling pin to drive the second positioning rolling pin to abut against the grounding rotor. Under this structural design, first roll round pin spring adopts the form of annular spring, directly hoops on first location roll round pin and isolation rotor, simple to operate, and rolls the drive of round pin and second location to first location and roll the round pin reliable and stable.

Preferably, the switch bracket comprises an insulating bracket unit for correspondingly mounting the main body part of each phase of vacuum switch unit, the insulating bracket unit comprises three insulating column layers which are distributed along the longitudinal direction, the three insulating column layers are respectively an upper insulating support column layer, a vacuum tube insulating support column layer and an isolating knife support column layer, each insulating column layer comprises a plurality of insulating support columns, an insulating partition plate is clamped between the two adjacent insulating column layers, the tops of the insulating support columns of the upper insulating support column layer are connected to the bottom of the transmission mechanism box through threads, the bottom ends of the insulating support columns of the upper insulating support column layer are connected with the top ends of the insulating support columns of the vacuum tube insulating support column layer through threads, insulating pull rods are mounted in a support space formed by the upper insulating support column layers, the insulating support columns of the vacuum tube insulating support column layer and the insulating support columns of the isolating knife support column layer are in one-to-one correspondence and are connected through threads, the vacuum tube is arranged in a supporting space formed by the vacuum tube insulating supporting column layer, the bottom end of the isolating knife supporting column layer is connected with a grounding position insulating plate, an isolating contact of the three-position isolating switch is arranged on an insulating partition plate between the vacuum tube insulating supporting column layer and the isolating knife supporting column layer, the grounding contact and the moving knife of the three-position isolating switch are both arranged on the grounding position insulating plate, and the insulating main shaft is supported on the grounding position insulating plate. Under this structural design, realize three-station isolator, three-phase vacuum switch unit and keep apart main shaft mechanism integration and install on the switch bracket, be convenient for install and the maintenance operation in later stage, and the switch bracket adopts three-layer columnar structure, and the installation of the three-station isolator of being convenient for, three-phase vacuum switch unit and keep apart main shaft mechanism is arranged, realizes switch bracket's recycle.

Preferably, the front end of the transmission mechanism box is flush with the normal pressure switch sealing box, the mechanism operating chamber extends to one side of one end of the transmission mechanism box, the side end chamber is provided with a port leading to the mechanism operating chamber, and the spring operation mechanism is installed in the side end chamber and is partially positioned in the mechanism operating chamber. Under this structural design, have structural layout reasonable, overall structure compactness and pleasing to the eye advantage.

The utility model is further described below with reference to the accompanying drawings.

Drawings

Fig. 1 is a side view of an atmospheric-pressure sealed air-insulated ring main unit according to an embodiment of the present invention;

FIG. 2 is a front side view of the relevant portion of the atmospheric switch capsule in accordance with an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a sealing box of a normal pressure switch according to an embodiment of the present invention;

FIG. 4 is a first schematic structural diagram of a vacuum switch unit according to an embodiment of the present invention;

fig. 5 is a schematic view of an internal structure of the opening/closing driving device according to the embodiment of the present invention;

FIG. 6 is a second schematic structural view of a vacuum switch unit according to an embodiment of the present invention;

FIG. 7 is a schematic diagram of the internal structure of the isolation actuator according to the embodiment of the present invention;

FIG. 8 is a schematic structural view of an isolation rotor according to an embodiment of the present invention;

FIG. 9 is a schematic view of a grounded rotor according to an embodiment of the present invention;

fig. 10 is a state diagram of the isolation operating mechanism located at the isolation closing station according to the embodiment of the present invention;

FIG. 11 is a state diagram of the isolation operating mechanism at the isolation opening station according to the embodiment of the present invention;

fig. 12 is a state diagram of the isolation operating mechanism located at the grounding and closing station according to the embodiment of the present invention;

fig. 13 is a state diagram of the isolation operating mechanism located at the grounding opening station according to the embodiment of the present invention;

FIG. 14 is a schematic view of a transmission slide according to an embodiment of the present invention;

fig. 15 is a third schematic structural view of a vacuum switch unit according to an embodiment of the present invention.

Detailed Description

Referring to the attached drawings 1-15, the utility model discloses a normal pressure sealing air insulation ring main unit, which comprises a normal pressure switch sealing box 1, wherein a pressure relief chamber 7 and a cable chamber 8 are arranged at the bottom of the normal pressure switch sealing box 1 side by side, a mechanism operating chamber 9 is arranged at the front side of the normal pressure switch sealing box 1, a three-phase vacuum switch unit 2 and a three-position isolating switch 3 are arranged in the normal pressure switch sealing box 1, the three-position isolating switch 3 is matched with an isolating operating mechanism 4, the isolating operating mechanism 4 drives the three-position isolating switch 3 to switch through an isolating main shaft mechanism 5, the isolating operating mechanism 4 is positioned in the mechanism operating chamber 9, the three-phase vacuum switch unit 2 is matched with a switching-closing driving device 6, the switching-closing driving device comprises a switching-closing driving mechanism 61 and an elastic operating mechanism 62, the top of a switch bracket 21 of the three-phase vacuum switch unit 2 is fixedly connected with a transmission mechanism box 60, the transmission mechanism box 60 is internally provided with a transmission mechanism installation chamber 600 and a side end chamber 601 positioned at one end of the transmission mechanism installation chamber 600, the opening and closing transmission mechanism 61 is installed in the transmission mechanism installation chamber 600, the elastic operation mechanism 62 is installed in the side end chamber 601, the elastic operation mechanism 62 corresponds to the position of the mechanism operation chamber 9, the top of the normal pressure switch sealing box 1 is provided with a top assembly opening 11, the three-phase vacuum switch unit 2 is installed in the normal pressure switch sealing box 1 along the top assembly opening 11, and the top assembly opening 11 is sealed and covered by the transmission mechanism box 60. The top of the vacuum switch unit 2 is integrally provided with the opening and closing drive device 6 through the transmission mechanism box 61, the vacuum switch unit and the opening and closing drive part are separately arranged, the vacuum switch unit 2 is arranged in the normal pressure switch sealing box 1, and the opening and closing drive device 6 is arranged in the transmission mechanism box 60 outside the normal pressure switch sealing box 1, so that the maintenance operation is convenient; and the transmission mechanism box 60 seals the top assembly port 11 of the normal pressure switch seal box 1 by a sealing cover, wherein the sealing cover structure is the conventional technology in the field, such as adopting rubber pads and bolts to lock and ensure reliable sealing, the structure is compact, the top opening of the normal pressure switch seal box can be conveniently hoisted and placed in the normal pressure switch seal box 1 and detached from the normal pressure switch seal box 1, the installation and maintenance are convenient, the transmission mechanism box 1 is simultaneously placed on the top assembly port 11 to seal and cover the top assembly port 11, the structure is compact, the disassembly and assembly are convenient, meanwhile, the size of the normal pressure switch seal box can be fully utilized, the compact installation of the spring-operated mechanism is realized, and the size miniaturization design of the ring main unit is realized. Namely, the installation of the spring operation mechanism utilizes the position of the transmission mechanism box, thereby being convenient for compact design and arrangement.

The side end chamber 601 of the transmission mechanism box 60 can protrude out of the design of the normal pressure switch sealing box, so that the spring operation mechanism is completely positioned in the transmission mechanism box, but the defects of inconvenient processing, assembly and maintenance and the like exist, and the appearance is not attractive, therefore, the front end of the transmission mechanism box 60 is flush with the normal pressure switch sealing box 1, the mechanism operating chamber 9 extends to the side of one end of the transmission mechanism box 60, the side end chamber 601 is provided with an opening leading to the mechanism operating chamber 9, and the spring operation mechanism 62 is installed in the side end chamber 601 and is partially positioned in the mechanism operating chamber 601. Has the advantages of reasonable structural layout, compact integral structure and attractive appearance.

In order to further make the ring main unit compact, the switching-closing transmission mechanism 61 includes a vacuum main shaft 611 rotatably installed in the transmission mechanism box 60, a switching-off spring 612 connected to the vacuum main shaft 611, and a vacuum switching-off connecting lever 613 installed on the vacuum main shaft 611, the vacuum switching-off connecting lever 613 is drivingly connected to the insulating pull rod 22 of the vacuum switch unit 2, the vacuum switching-off connecting lever 613 is hinged to a vacuum pull plate 614, the vacuum pull plate 614 is hinged to the pull rod adjusting head 221 of the insulating pull rod 22, the vacuum main shaft 611 is provided with a spring mounting arm 615, one end of the switching-off spring 612 is mounted on the transmission mechanism box 60, the other end of the switching-off spring 612 is mounted on the spring mounting arm 615, the elastic operation mechanism 62 is horizontally arranged in the side end chamber 601, the vacuum main shaft 611 corresponds to the lateral middle position of the operation mechanism 62, the elastic mechanism 62 includes a mechanism 621 and an operation mechanism main body 622 installed on the mechanism 621, the mechanism frame 621 comprises an outer mounting substrate and an inner mounting substrate which are oppositely arranged and supported by a supporting shaft sleeve in the middle, the operating mechanism main body 622 is a conventional technology in the field, and is a structure using a spring operating mechanism main body in the ZW32-12 outdoor alternating current high voltage vacuum circuit breaker, so the detailed structure thereof is not described any more, but the output structure part of the spring operating mechanism is modified and designed, specifically: the operating mechanism body 622 is provided with a power input shaft 6221, the power input shaft 6221 is provided with a first crank arm 6222 driven by the power input shaft 6221 to swing, the elastic steering mechanism 62 is installed at one axial end position of the vacuum main shaft 611, the power input shaft 6221 and the vacuum main shaft 611 are arranged in the same axial direction, the mechanism frame 621 is rotatably provided with a mechanism power output transition shaft 6223 arranged in the axial direction of the power input shaft 6221, the mechanism power output transition shaft 6223 is provided with a power output end, the mechanism power output transition shaft 6223 is provided with a second crank arm 6224, the eccentric swing end of the first crank arm 6222 is hinged with a transmission pull rod 6225, the transmission pull rod 6225 is hinged on the second crank arm 6224 relative to the other end of the hinged end of the first crank arm 6222, the power output end of the mechanism power output transition shaft 6223 is provided with a third crank arm 6226, the third crank arm 6226 is hinged with a vacuum transmission rod 6227, the vacuum switch arm 61613 is arranged on the side of the vacuum main shaft 611 close to the elastic steering mechanism 62, the vacuum transmission bar 6227 is hinged to the hinge arm 6131. The spring operation mechanism is designed by adopting a mechanism power output transition shaft, so that the spring operation mechanism is horizontally arranged at a side end chamber of the transmission mechanism box and is transmitted with the vacuum main shaft through a transmission structure related to the vacuum transmission rod, the spring operation mechanism is more compactly arranged in the transmission mechanism box, and the whole ring main unit is more compact in structure and more miniaturized in size.

The isolation main shaft mechanism 5 comprises an insulation main shaft 51 supported in a normal pressure switch sealing box 1, an isolation connecting lever 52 is fixed on the insulation main shaft 51, the isolation connecting lever 52 is hinged with an isolation pull rod 53, the isolation pull rod 53 is hinged with the middle part of a moving knife 31 of a three-station isolation switch 3, in order to enable the three-station isolation switch to realize rapid and reliable grounding closing and isolation closing actions, a closing energy storage assembly is installed on the insulation main shaft 51 and comprises an eccentric arm 541 which is installed on the insulation main shaft 51 and rotationally linked with the insulation main shaft 51, an energy storage spring 542 is matched at the eccentric end of the eccentric arm 541, a spring seat 12 is arranged on the normal pressure switch sealing box 1, one end of the energy storage spring 542 is positioned on the spring seat 12, the axis o of the insulation main shaft 51 corresponds to a straight line d where the spring force of the energy storage spring 542 is positioned when the insulation main shaft 51 rotates to a switching-off station, and energy storage is completed (as shown in figure 2), and releases the spring storage capacity when the insulating main shaft 51 rotates clockwise and counterclockwise to cut out the opening station. The insulating main shaft 51 directly passes through the eccentric arm to be matched with an energy storage spring to store energy when reaching a switching-off station, and the energy storage force of the spring realizes that the insulating main shaft rapidly rotates to enter an isolation switching-on station and a grounding switching-on station.

Wherein energy storage spring can be the extension spring, but for the convenience arrange and realize that work is more reliable and more stable, energy storage spring 542 is helical compression spring, and it has spring location axle 543 to articulate on the eccentric arm 541, is equipped with spring supporting disk 5431 on the spring location axle 543, and energy storage spring 542 overlaps and locates on the spring location axle 543, thereby energy storage spring 542 supports on the spring supporting disk 5431 and constitutes the eccentric end of roof pressure eccentric arm 541, be equipped with the axle holding hole that supplies spring location axle 543 to pass on the spring holder 12, spring location axle 543 is inserted in the axle holding hole for the other end activity with the articulated one end of eccentric arm 541. One end of the helical compression spring is a force application end for pushing the eccentric arm, the other end of the helical compression spring is a positioning fulcrum which is positioned and supported on the spring seat, and the force application end of the helical compression spring swings around the positioning fulcrum along with the eccentric end of the eccentric arm, so that the helical compression spring has the advantages of simple and compact structure and reliable action.

In this embodiment, the isolation operating mechanism 4 includes a mechanism bracket 41, an isolation operating shaft 42, a ground operating shaft 43, a transmission sliding plate 44, an isolation rotor assembly and a ground rotor assembly, the mechanism bracket 41 includes a front side plate 411 and a rear side plate 412, an assembly space is provided between the front side plate 411 and the rear side plate 412, the front side plate 411 and the rear side plate 412 are supported and fixed by a support column, the transmission sliding plate 44 is limited to slide linearly in a reciprocating manner in a predetermined stroke along a longitudinal direction in the assembly space, the isolation rotor assembly and the ground rotor assembly are respectively arranged on two lateral sides of the transmission sliding plate 44, a strip-shaped groove 440 is designed on the transmission sliding plate 44, a positioning pin and the strip-shaped groove 440 are mounted on the mechanism bracket 41 to cooperate, so as to achieve position limitation and linear sliding guidance of the transmission sliding plate 44; to reduce the friction of the drive slide 44, rollers may be mounted on the locating pins to support the drive slide 44.

The transmission slide plate 44 has an isolation switch-on station (as shown in fig. 10), a grounding switch-on station (as shown in fig. 12) and a switch-off station (as shown in fig. 11 and 13) corresponding to the ends of the two sliding strokes respectively in the sliding stroke, the transmission slide plate 44 is in transmission connection with the insulating main shaft 51, the isolation side linkage groove 441 and the grounding side linkage groove 442 are respectively arranged at two transverse sides of the transmission slide plate 44, the isolation side linkage groove 441 and the grounding side linkage groove 442 both include pushing

walls

4411 and 4421 and an avoiding interval between the two pushing

walls

4411 and 4421 which are arranged at intervals along the sliding direction of the transmission slide plate,

the isolating rotor assembly comprises an isolating rotor 45 arranged on an isolating operation shaft 42, a first limiting part 46 limiting the isolating rotor 45 to rotate in a reciprocating manner in an isolating opening/closing stroke, and a first position maintaining assembly 47 maintaining the position of the isolating rotor 45 when the isolating rotor 45 rotates to an isolating opening/closing position, wherein the isolating rotor 45 is provided with an isolating shifting arm 451 correspondingly matched with an isolating side linkage groove 441 to drive a transmission sliding plate 44 to slide in a reciprocating manner between an opening station and an isolating closing station, the isolating shifting arm 451 of the isolating rotor 45 can extend into the isolating side linkage groove 441 and is in pushing fit with two pushing walls 4411 of the isolating side linkage groove 441,

the grounding rotor assembly comprises a grounding rotor 48 arranged on a grounding operation shaft 43, a second limiting part 49 limiting the grounding rotor 48 to rotate in a reciprocating manner in a grounding opening/closing stroke, and a second position maintaining assembly 40 maintaining the position of the grounding rotor 48 when the grounding rotor 48 rotates to a grounding opening/closing position, the grounding rotor 48 is provided with a grounding shifting arm 481 correspondingly matched with the grounding side linkage groove 442 so as to drive the transmission sliding plate 44 to slide in a reciprocating manner between the opening station and the grounding closing station, and the grounding shifting arm 481 of the grounding rotor 48 can extend into the grounding side linkage groove 442 and is in pushing fit with two pushing walls 4421 of the grounding side linkage groove 442;

when the transmission sliding plate 44 slides to the grounding switching-on station (as shown in fig. 12), the shifting end of the isolation shifting arm 451 goes beyond the isolation-side linkage groove 441 and is stopped by the side wall of the transmission sliding plate 44 to limit the isolation rotor 45 to rotate and switch to the isolation switching-on station; when the transmission slide plate 44 slides to the isolation closing position (as shown in fig. 10), the moving end of the grounding moving arm 481 moves out of the grounding-side interlocking groove 442 and stops against the side wall of the transmission slide plate 44 to limit the rotation switching of the grounding rotor 48 to the grounding closing position. By adopting the technical scheme, when the brake is switched off, the stirring end of the isolating stirring arm of the isolating rotor extends into the isolating side linkage groove, the stirring end of the grounding stirring arm of the grounding rotor 48 extends into the grounding side linkage groove, and during the isolating and switching-on operation, the isolating operating shaft is rotated to rotate the isolating rotor 45, so that the transmission sliding plate is stirred to slide to the isolating and switching-on station, the insulating main shaft is driven to rotate, the switching of the driving movable knife is driven to enter the isolating and switching-on position, the isolating and switching-on operation is finished, and along with the sliding of the transmission sliding plate, the stirring end of the grounding stirring arm exceeds the grounding side linkage groove and is stopped by the side wall of the transmission sliding plate to limit the grounding rotor 48 to rotate and switch to the grounding and switching-on position, and the grounding locking is realized; when the isolation brake-separating operation is carried out, the isolation operation shaft is reversely rotated; completing grounding switch-on and grounding switch-off operations in the same way; the thin design of the isolation operating mechanism is realized, so that the overall size of the ring main unit is reduced, the national standard requirements are better met, the structure is simple, and the operation is safe and reliable.

A power input member 55 is fixedly mounted at one end of the insulating main shaft 51, a transmission crank arm 551 is arranged on the power input member 55, a supporting portion 4111 is arranged on the front side plate 411, the power input member 55 is rotatably supported on the supporting portion 4111, a transverse linkage groove 443 extending in the transverse direction is arranged on the transmission sliding plate 44, and a linkage shaft is arranged on the transmission crank arm 551 and limited in the transverse linkage groove 443, so that the power input member 55 is driven to rotate by the sliding of the transmission sliding plate 44. In order to reduce friction, a rolling sleeve is arranged on the universal driving shaft; the linkage structure of the insulating main shaft and the insulating main shaft is simple and reliable.

In this embodiment, the first position maintaining assembly 47 includes a first positioning roller 471 and a first roller spring 472, the first positioning roller 471 is linearly slidably fitted on the mechanism bracket 41 along the radial direction of the isolation rotor 45, two positioning slots 452 are circumferentially provided on the outer circumferential side of the isolation rotor 45, the first roller spring 472 provides a spring retaining force pressing the first positioning roller 471 against the outer circumferential surface of the isolation rotor 45, so as to force the first positioning roller 471 to slide and switch between the two positioning slots 452 with the rotation of the isolation rotor 45; the second position maintaining assembly 40 includes a second positioning rolling pin 401 and a second rolling pin spring 402, the second positioning rolling pin 401 is linearly and slidably fitted on the mechanism bracket 41 along the radial direction of the grounding rotor 48, two positioning slots 482 are circumferentially arranged on the outer circumferential side of the grounding rotor 48, and the second rolling pin spring 402 provides a spring holding force pressing the second positioning rolling pin 401 against the outer circumferential surface of the grounding rotor 48, so as to force the second positioning rolling pin 401 to slide and switch between the two positioning slots 482 with the rotation of the grounding rotor 48. The first positioning rolling pin is adopted to abut against the isolation rotor 45 under the driving of the first rolling pin spring, and moves on the outer circumferential surface of the isolation rotor along with the rotation of the isolation rotor so as to enter and slide out of the two positioning clamping grooves, and the first positioning rolling pin is clamped into the positioning clamping grooves of the isolation rotor 45 to realize the positioning and the keeping of the isolation rotor 45; the positioning and the keeping of the grounding rotor are realized in the same way. Waist-shaped holes are designed on the front side plate 411 and the rear side plate 412 for sliding guidance of the first positioning rolling pin 471 and the second positioning rolling pin 401

For further convenience of installation and reliable operation, the first rolling pin spring 472 and the second rolling pin spring 402 are both ring springs formed by winding coil springs, the first rolling pin spring 472 surrounds the rotation central axis of the isolation rotor 45 and the first positioning rolling pin 472 to drive the first positioning rolling pin 472 to press against the isolation rotor 45, and the second rolling pin spring 402 surrounds the rotation central axis of the grounding rotor 48 and the second positioning rolling pin 402 to drive the second positioning rolling pin 402 to press against the grounding rotor 48. The first positioning rolling pin is hooped on the isolation rotor through the first rolling pin spring, the second positioning rolling pin is hooped on the grounding rotor through the second rolling pin spring hoop, the installation is convenient, and the driving of the first positioning rolling pin and the second positioning rolling pin is stable and reliable. The first position-limiting element 46 is a position-limiting pin fixed on the mechanism bracket 41, a rotor stroke-limiting groove 453 extending along the circumferential direction is provided on the outer circumferential side of the isolation rotor 45, and the first position-limiting element corresponds to the rotor stroke-limiting groove 453 on the isolation rotor 45 and is in stopping position-limiting fit with the two end walls 4531 of the rotor stroke-limiting groove 453 on the isolation rotor 45. The second limiting member 49 is also designed as a limiting pin, a rotor stroke limiting groove 483 extending in the circumferential direction is provided at the outer circumferential side of the grounding rotor 48, and the second limiting member 49 corresponds to the rotor stroke limiting groove 483 on the grounding rotor 48 and is in stopping limiting fit with two end walls 481 of the rotor stroke limiting groove 483 on the grounding rotor 48. The stroke limitation of the isolation rotor or/and the grounding rotor is simple and reliable.

In order to facilitate the assembly and maintenance, the isolation main shaft mechanism 5 positioned in the normal pressure switch sealing box 1 is integrally arranged on the switch bracket 21; and in order to solve the defects of non-recoverability and inconvenient installation of the existing switch support system, the switch support 21 comprises an insulating support unit for correspondingly installing the main body part of each phase of vacuum switch unit, the main body part of each phase of vacuum switch unit is the conventional technology in the field, the main body part of each phase of vacuum switch unit generally comprises an insulating pull rod 22, a vacuum tube 23 and a flexible connection 24, the insulating support unit comprises three insulating column layers 211 distributed along the longitudinal direction, the three insulating column layers are respectively an upper insulating support column layer 211-1, a vacuum tube insulating support column layer 211-2 and an isolation knife support column layer 211-3, each insulating column layer comprises a plurality of insulating support columns 2111, an insulating partition plate 212 is clamped between the two adjacent insulating column layers 211, the top of the insulating support column 2111 of the upper insulating support column layer 211-1 is connected to the bottom of a transmission mechanism box through threads, the bottom end of an insulating support column 2111 of an upper insulating support column layer 211-1 is connected with the top end of an insulating support column of a vacuum tube insulating support column layer 211-2 through threads, an insulating pull rod 22 is arranged in a support space formed by the upper supporting insulating column layer 211-1, the insulating support columns of the vacuum tube insulating support column layer 211-2 and the insulating support columns 2111 of an isolating knife support column layer 211-3 are in one-to-one correspondence and are connected through threads, a vacuum tube 23 is arranged in the support space formed by the vacuum tube insulating support column layer 211-3, the bottom end of the isolating knife support column layer 211-3 is connected with a grounding position insulating plate 213, an isolating contact 32 of the three-station isolating switch 3 is arranged on an insulating partition plate 212 between the vacuum tube insulating support column layer 211-2 and the isolating knife support column layer 211-3, and a grounding contact 33 and a movable knife 31 of the three-station isolating switch 3 are both arranged on the grounding position insulating plate 213, the insulating main shaft 51 is supported on the ground insulating plate 213. Realize three station isolator, three-phase vacuum switch unit and keep apart main shaft mechanism integrated installation on the switch support, be convenient for installation and later maintenance operation, and the switch support adopts three-layer columnar structure, and the installation of three station isolator, three-phase vacuum switch unit and the isolation main shaft mechanism of being convenient for is arranged, realizes switch support's recycle.

Claims

1. The utility model provides a sealed air insulation looped netowrk cabinet of ordinary pressure, including the ordinary pressure switch seal box, pressure relief room and cable chamber have been arranged side by side to the ordinary pressure switch seal box bottom, the mechanism's control chamber has been arranged to the ordinary pressure switch seal box front side, three-phase vacuum switch unit and three-station isolator have been arranged in the ordinary pressure switch seal box, three-station isolator cooperation has isolation operating device, isolation operating device is through the three-station isolator switching action of isolation spindle mechanism drive, it is located the mechanism's control chamber to keep apart operating device, three-phase vacuum switch unit cooperation has divide-shut brake drive arrangement, divide-shut brake drive arrangement includes divide-shut brake drive mechanism and spring operation mechanism, its characterized in that: three-phase vacuum switch unit's switch support top fixedly connected with drive mechanism case has the drive mechanism installation room and is located the side room of drive mechanism installation room one end in the drive mechanism case, divide closing transmission mechanism to install in the drive mechanism installation room, and the mechanism is installed at the side indoor to the bullet operation, and the bullet operation mechanism part corresponds in mechanism operation room position, and the top of ordinary pressure switch seal box has the top assembly mouth, and three-phase vacuum switch unit is packed into the ordinary pressure switch seal box along the top assembly mouth in, and the top assembly mouth is through the sealed closing cap of drive mechanism case.

2. The atmospheric-pressure sealed air-insulated ring main unit according to claim 1, wherein: the opening and closing transmission mechanism comprises a vacuum main shaft rotatably arranged in a transmission mechanism box, a separating spring connected to the vacuum main shaft and a vacuum opening and closing crank arm arranged on the vacuum main shaft, the vacuum opening and closing crank arm is connected to an insulating pull rod of a vacuum switch unit in a linkage manner, an elastic operation mechanism is arranged in a side end chamber in a horizontal and horizontal manner, the vacuum main shaft corresponds to the transverse middle position of the elastic operation mechanism, the elastic operation mechanism comprises a mechanism frame and an operation mechanism body arranged on the mechanism frame, the mechanism frame comprises an outer side installation base plate and an inner side installation base plate which are oppositely arranged and supported by a supporting shaft sleeve in the middle, the operation mechanism body is provided with a power input shaft, a first crank arm driven by the power input shaft to swing is arranged on the power input shaft, the elastic operation mechanism is arranged at one axial end position of the vacuum main shaft, and the power input shaft and the vacuum main shaft are arranged in the same axial direction, the mechanism frame on rotate and be provided with the mechanism power output transition axle of following power input shaft axial arrangement, mechanism power output transition axle has a power take off end, installs the second turning arm on the mechanism power output transition axle, the eccentric swing end of first turning arm articulates there is the transmission pull rod, and the transmission pull rod articulates on the second turning arm for the other end with the articulated one end of first turning arm, installs the third turning arm on the power output end of mechanism power output transition axle, and the third turning arm articulates there is the vacuum transfer line, is equipped with the articulated arm on the vacuum main shaft near the vacuum divide-shut brake turning arm of mechanism one side of manipulating, and the vacuum transfer line articulates on the articulated arm.

3. The atmospheric-pressure sealed air-insulated ring main unit according to claim 1, wherein: the isolation main shaft mechanism comprises an insulation main shaft supported in a normal pressure switch sealing box, an isolation crank arm is fixed on the insulation main shaft, the isolation crank arm is hinged with an isolation pull rod, the isolation pull rod is hinged in the middle of a moving knife of a three-station isolation switch, a closing energy storage assembly is installed on the insulation main shaft and comprises an eccentric arm installed on the insulation main shaft and rotationally linked with the insulation main shaft, an energy storage spring is matched with the eccentric end of the eccentric arm, a spring seat is arranged on the normal pressure switch sealing box, one end of the energy storage spring is positioned on the spring seat, the axis of the insulation main shaft corresponds to the straight line of the spring force of the energy storage spring when the insulation main shaft rotates to an opening station and completes energy storage, and the energy storage capacity of the spring is released when the insulation main shaft rotates clockwise and anticlockwise to cut out the opening station.

4. The atmospheric-pressure sealed air-insulated ring main unit according to claim 3, wherein: the energy storage spring is a helical compression spring, a spring positioning shaft is hinged to the eccentric arm, a spring supporting plate is arranged on the spring positioning shaft, the energy storage spring is sleeved on the spring positioning shaft and supported on the spring supporting plate to form an eccentric end for jacking the eccentric arm, a shaft retaining hole for the spring positioning shaft to penetrate is formed in the spring seat, and the spring positioning shaft is movably inserted into the shaft retaining hole relative to the other end of the end hinged to the eccentric arm.

5. The atmospheric-pressure sealed air-insulated ring main unit according to claim 3, wherein: the isolation operating mechanism comprises a mechanism bracket, an isolation operating shaft, a grounding operating shaft, a transmission sliding plate, an isolation rotor component and a grounding rotor component, wherein the mechanism bracket comprises a front side plate and a rear side plate, an assembly interval is arranged between the front side plate and the rear side plate, the transmission sliding plate is limited in the assembly interval to linearly slide in a reciprocating manner in a preset stroke along the longitudinal direction, the isolation rotor component and the grounding rotor component are respectively arranged at the two transverse sides of the transmission sliding plate,

the transmission sliding plate is provided with an isolation switching-on station, a grounding switching-on station and a switching-off station, wherein the isolation switching-on station and the grounding switching-off station correspond to the tail ends of two sliding strokes respectively, the switching-off station corresponds to the middle part of the sliding stroke, the transmission sliding plate is in transmission connection with the insulating main shaft, two transverse sides of the transmission sliding plate are respectively provided with an isolation side linkage groove and a grounding side linkage groove, the isolation side linkage groove and the grounding side linkage groove respectively comprise pushing walls which are arranged at intervals along the sliding direction of the transmission sliding plate and an avoiding interval between the two pushing walls,

the grounding rotor assembly comprises a grounding rotor arranged on the grounding operation shaft, a second limiting part limiting the grounding rotor to rotate in a reciprocating manner in a grounding opening/closing stroke, and a second position maintaining assembly maintaining the position of the grounding rotor when the grounding rotor rotates to a grounding opening/closing position, the grounding rotor is provided with a grounding shifting arm correspondingly matched with the grounding side linkage groove to drive the transmission sliding plate to slide in a reciprocating manner between the opening station and the grounding closing station, and the grounding shifting arm of the grounding rotor can extend into the grounding side linkage groove and is in pushing fit with two pushing walls of the grounding side linkage groove;

when the transmission sliding plate slides to the grounding switching-on station, the shifting end of the isolation shifting arm crosses the isolation side linkage groove and stops against the side wall of the transmission sliding plate to limit the isolation rotor to rotate and switch to the isolation switching-on station; when the transmission sliding plate slides to the isolation switching-on station, the shifting end of the grounding shifting arm goes beyond the grounding side linkage groove and is stopped by the side wall of the transmission sliding plate so as to limit the grounding rotor to rotate and switch to the grounding switching-on station.

6. The atmospheric-pressure sealed air-insulated ring main unit according to claim 5, wherein: the power input part is fixedly mounted at one end of the insulating main shaft, the power input part is provided with a transmission crank arm, the front side plate is provided with a supporting part, the power input part is rotatably supported on the supporting part, the transmission sliding plate is provided with a transverse linkage groove extending along the transverse direction, the transmission crank arm is provided with a linkage shaft, and the linkage shaft is limited in the transverse linkage groove, so that the power input part is driven to rotate through the sliding of the transmission sliding plate.

7. The atmospheric-pressure sealed air-insulated ring main unit according to claim 5, wherein: the first position maintaining assembly comprises a first positioning rolling pin and a first rolling pin spring, the first positioning rolling pin is linearly matched on the mechanism support in a sliding manner along the radial direction of the isolation rotor, two positioning clamping grooves are formed in the outer circumferential side of the isolation rotor along the circumferential direction, and the first rolling pin spring provides a spring maintaining force for pressing the first positioning rolling pin against the outer circumferential surface of the isolation rotor, so that the first positioning rolling pin is forced to slide along with the rotation of the isolation rotor and is switched between the two positioning clamping grooves; the second position holding assembly comprises a second positioning rolling pin and a second rolling pin spring, the second positioning rolling pin is in linear sliding fit on the mechanism support along the radial direction of the grounding rotor, two positioning clamping grooves are formed in the outer circumferential side of the grounding rotor along the circumferential direction, and the second rolling pin spring provides spring holding force for pressing the second positioning rolling pin against the outer circumferential surface of the grounding rotor, so that the second positioning rolling pin is forced to slide along with the rotation of the grounding rotor and is switched between the two positioning clamping grooves.

8. The atmospheric-pressure sealed air-insulated ring main unit according to claim 7, wherein: the first rolling pin spring and the second rolling pin spring are annular springs formed by winding spiral springs, the first rolling pin spring surrounds the rotating central shaft of the isolation rotor and the first positioning rolling pin to drive the first positioning rolling pin to abut against the isolation rotor, and the second rolling pin spring surrounds the rotating central shaft of the grounding rotor and the second positioning rolling pin to drive the second positioning rolling pin to abut against the grounding rotor.

9. The atmospheric-pressure sealed air-insulated ring main unit according to claim 1, wherein: the switch support comprises an insulating support unit for correspondingly mounting the main body part of each phase of vacuum switch unit, the insulating support unit comprises three insulating column layers which are distributed along the longitudinal direction, the three insulating column layers are respectively an upper insulating support column layer, a vacuum tube insulating support column layer and an isolating knife support column layer, each insulating column layer comprises a plurality of insulating support columns, an insulating partition plate is clamped between every two adjacent insulating column layers, the tops of the insulating support columns of the upper insulating support column layer are connected to the bottom of a transmission mechanism box through threads, the bottom ends of the insulating support columns of the upper insulating support column layer are connected with the top ends of the insulating support columns of the vacuum tube insulating support column layer through threads, insulating pull rods are mounted in a support space formed by the upper insulating column layers, the insulating support columns of the vacuum tube insulating support column layer are in one-to-one correspondence with the insulating support columns of the isolating knife support column layer and are connected through threads, the vacuum tube is arranged in a supporting space formed by the vacuum tube insulating supporting column layer, the bottom end of the isolating knife supporting column layer is connected with a grounding position insulating plate, an isolating contact of the three-position isolating switch is arranged on an insulating partition plate between the vacuum tube insulating supporting column layer and the isolating knife supporting column layer, the grounding contact and the moving knife of the three-position isolating switch are both arranged on the grounding position insulating plate, and the insulating main shaft is supported on the grounding position insulating plate.

10. The atmospheric-pressure sealed air-insulated ring main unit according to claim 1 or 2, wherein: the front end of the transmission mechanism box is flush with the normal pressure switch sealing box, the mechanism operating chamber extends to one side of one end of the transmission mechanism box, the side end chamber is provided with a port leading to the mechanism operating chamber, and the spring operation mechanism is installed in the side end chamber and is partially positioned in the mechanism operating chamber.