CN117238711A

CN117238711A - Electrical switching apparatus and gas-filled cabinet

Info

Publication number: CN117238711A
Application number: CN202311144965.3A
Authority: CN
Inventors: 李金辉; 厉复新; 袁丽丹; 孙一帆; 杨圣彬
Original assignee: Tbea Yunji Electric Co ltd
Current assignee: Tbea Yunji Electric Co ltd
Priority date: 2023-09-06
Filing date: 2023-09-06
Publication date: 2023-12-15

Abstract

The application relates to an electrical switching apparatus and an inflatable cabinet. The equipment comprises a box body, a breaker mechanism and a three-station switch mechanism; the box body comprises a sealing plate; the three-station switch mechanism comprises a grounding contact seat, an isolation contact seat, a connection contact seat and a movable contact, wherein the grounding contact seat is arranged on the sealing plate, the isolation contact seat is fixed through a supporting insulator, and the connection contact seat is connected with the wall of the box body through an insulating supporting piece; the moving contact is electrically connected to the isolation contact seat, and is provided with a first communication position and a second communication position, when the moving contact is in the first communication position, the moving contact is electrically connected with the grounding contact seat, when the moving contact is in the second communication position, the moving contact is electrically connected with the connection contact seat, and the moving contact can be driven to move between the first communication position and the second communication position through operation of the moving contact. The isolation contact seat is fixed through the support insulator, the connection contact seat is connected with the wall of the box body through the insulation support piece, and force application on the solid-sealed polar pole is avoided, so that the risk of sinking of the solid-sealed polar pole is reduced, and the stability and reliability of the device are improved.

Description

Electrical switching apparatus and gas-filled cabinet

Technical Field

The application relates to the technical field of electric switches, in particular to an electric switch device and an inflatable cabinet.

Background

As users have increased demands for miniaturization, modularity, and reliability of switchgear, more and more inflatable cabinet products have stepped into the history stage. The high-voltage electric appliances of the functional units such as the vacuum circuit breaker, the three-station switch and the like are arranged in a sealed box body, and a gas insulating medium slightly higher than the atmospheric pressure is filled in the sealed box body, so that the sealed box body can be reliably used under severe conditions. However, in order to reduce the volume and cost, the existing switching device causes the whole solid-sealed polar pole to have a risk of sinking, which affects the reliability of the product.

Disclosure of Invention

In view of this, it is necessary to provide an electrical switching device for solving the technical problem that the reliability of the product is affected by the risk of sinking the whole solid-sealed pole in order to reduce the volume and cost of the conventional switching device. Technical problem of "or direct frontal description".

An electrical switching apparatus comprising:

the box body comprises a sealing plate;

the circuit breaker mechanism comprises a control panel and a solid sealing pole which are electrically connected, wherein the control panel and the solid sealing pole are respectively arranged at two sides of the sealing plate;

the three-station switch mechanism comprises a switch device, wherein the switch device comprises a grounding contact seat, an isolation contact seat, a connection contact seat and a moving contact, the grounding contact seat is arranged on the sealing plate, the isolation contact seat is fixed through a supporting insulator, and the connection contact seat is connected with the wall of the box body through an insulating supporting piece;

the contact-on contact seat or the isolation contact seat is electrically connected to the solid-sealed polar pole, the moving contact is electrically connected to the isolation contact seat, the moving contact is provided with a first communication position and a second communication position, the moving contact is electrically connected with the grounding contact seat when in the first communication position, the moving contact is electrically connected with the contact-on contact seat when in the second communication position, and the moving contact can be driven to move between the first communication position and the second communication position through operation.

In one embodiment, one end of the insulating support member is provided with a boss and at least one groove circumferentially surrounding the boss, and the boss is used for being connected with the contact.

In one embodiment, the three-position switch mechanism further comprises a fastener and a sealing ring, wherein one side of the insulating support piece, which is away from the contact seat, is provided with a mounting hole, the fastener penetrates through the mounting hole and is connected with the box body, and the sealing ring is arranged between the box body wall and the insulating support piece and surrounds the mounting hole to seal the mounting hole.

In one embodiment, the on contact is electrically connected to the encapsulated pole, and the electrical switching apparatus further includes an outlet sleeve electrically connected to the isolation contact.

In one embodiment, the three-position switch mechanism further comprises a connection copper bar, one end of the connection copper bar is connected with the isolation contact base, and the other end of the connection copper bar is connected with the outlet sleeve.

In one embodiment, the three-position switch mechanism further comprises an operating device, the operating device comprises a driving piece and a screw rod, the driving piece is installed on the sealing plate, the screw rod is in transmission connection with the driving piece, the moving contact is in threaded connection with the screw rod, the moving contact is at least partially accommodated in the isolation contact seat, and the isolation contact seat is located between the grounding contact seat and the connection contact seat;

the movable contact is configured to move along the arrangement direction of the grounding contact seat and the connection contact seat in the process that the driving piece drives the screw rod to rotate, so that the movable contact moves between the first communication position and the second communication position.

In one embodiment, a matching hole for the moving contact to pass through is formed in the isolation contact seat, and elastic contact fingers are arranged at two ends of the matching hole and are used for abutting against the moving contact.

In one embodiment, the operation device further includes three driven gears and a transmission member, the three driven gears are respectively connected with the lead screws corresponding to the moving contacts of each phase, the transmission member is connected to the three driven gears in a transmission manner, and the transmission member is configured to drive the three driven gears to rotate synchronously under the driving of the driving member.

In one embodiment, the transmission member includes three transmission chains, the three-position switch mechanism further includes a driving gear connected to an output end of the driving member, the driven gear located at the middle position is respectively tensioned with two adjacent driven gears to one transmission chain, and the driving gear and one of the driven gears are tensioned with one transmission chain.

The application also provides an air charging cabinet which can solve at least one technical problem.

The inflatable cabinet comprises a cabinet body and the electrical switching equipment, wherein the electrical switching equipment is arranged in the cabinet body.

The beneficial effects are that:

the embodiment of the application provides electrical switching equipment which comprises a box body, a circuit breaker mechanism and a three-station switching mechanism; the box body comprises a sealing plate; the circuit breaker mechanism comprises a control panel and a solid sealing pole which are electrically connected, and the control panel and the solid sealing pole are respectively arranged at two sides of the sealing plate; the three-station switch mechanism comprises a switch device, the switch device comprises a grounding contact seat, an isolation contact seat, a connection contact seat and a moving contact, the grounding contact seat is arranged on the sealing plate, the isolation contact seat is fixed through a supporting insulator, and the connection contact seat is connected with the wall of the box body through an insulating supporting piece; the contact seat is put through or keeps apart and contact the seat electricity and be connected in solid seal utmost point post, and the moving contact electricity is connected in keeping apart the contact seat, and the moving contact has first connected position and second connected position, and in first connected position, the moving contact is connected with ground contact seat electricity, and in the second connected position, the moving contact is connected with the contact seat electricity, through operating the moving contact, can drive the moving contact and remove between first connected position and second connected position.

According to the application, the three-station switch mechanism and the breaker mechanism are fixed on the same sealing plate, the contact-on seat or the isolation contact seat is electrically connected to the solid-sealed polar pole, the moving contact is electrically connected to the isolation contact seat, and the moving contact can move between the first communication position and the second communication position through operating the moving contact, so that the switching among the grounding position, the isolation position and the connection position is realized, the volume is reduced, the assembly efficiency is improved on the premise of meeting basic performance, in addition, the isolation contact seat is fixed through the supporting insulator, and the connection contact seat is connected with the wall of the box body through the insulating supporting piece, so that the force applied to the solid-sealed polar pole is avoided, the sinking risk of the solid-sealed polar pole is reduced, and the stability and the reliability of equipment are improved.

The application also provides an inflatable cabinet which comprises a cabinet body and the electrical switching equipment, wherein the electrical switching equipment is arranged in the cabinet body. The inflatable cabinet can achieve at least one technical effect.

Drawings

Fig. 1 is a schematic diagram of an electrical switching apparatus according to an embodiment of the present application.

Fig. 2 is a front view of an electrical switching apparatus according to an embodiment of the present application.

Fig. 3 is a schematic view of an insulating support in an electrical switching apparatus according to an embodiment of the present application.

Fig. 4 is a schematic diagram of an isolation contact in an electrical switching apparatus according to an embodiment of the present application.

Fig. 5 is a schematic view of a portion of an operating device in an electrical switching apparatus according to an embodiment of the present application.

Reference numerals:

100-sealing plate; 200-a circuit breaker mechanism; 210-fixedly sealing the polar post; 211-wire outlet end; 220-a control panel; 300-three-station switching mechanism; 310-switching means; 311-a ground contact base; 312-isolating the contact pads; 313-connect contact; 314—moving contact; 315-mating holes; 316-elastic contact fingers; 320-operating means; 321-a driver; 322-screw; 323-driven gear; 324-a drive chain; 325-a drive gear; 410-outlet sleeve; 420-supporting insulators; 430-connecting copper bars; 440-insulating support; 441-bosses; 442-grooves; 443-sealing groove; 444-fasteners; 445-sealing ring; 446-a first bump; 447-second protrusions; 448-mounting holes; 450-supporting copper blocks.

Detailed Description

In order that the above objects, features and advantages of the application will be readily understood, a more particular description of the application will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. The present application may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the application, whereby the application is not limited to the specific embodiments disclosed below.

In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present application, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

Referring to fig. 1 and 2, fig. 1 is a schematic diagram of an electrical switching apparatus according to an embodiment of the present application. Fig. 2 is a front view of an electrical switching apparatus according to an embodiment of the present application. An embodiment of the present application provides an electrical switching apparatus, including a case, a circuit breaker mechanism 200, and a three-position switching mechanism 300; the case includes a sealing plate 100; the circuit breaker mechanism 200 comprises a control panel 220 and a solid-sealed pole 210 which are electrically connected, wherein the control panel 220 and the solid-sealed pole 210 are respectively arranged at two sides of the sealing plate 100; the three-position switch mechanism 300 comprises a switch device 310, wherein the switch device 310 comprises a grounding contact seat 311, an isolation contact seat 312, a connection contact seat 313 and a moving contact 314, the grounding contact seat 311 is arranged on the sealing plate 100, the isolation contact seat 312 is fixed through a supporting insulator 420, and the connection contact seat 313 is connected with the wall of the box body through an insulating supporting piece 440; the contact-on contact base 313 or the isolation contact base 312 is electrically connected to the solid-sealed pole 210, the moving contact 314 is electrically connected to the isolation contact base 312, the moving contact 314 has a first communication position and a second communication position, in the first communication position, the moving contact 314 is electrically connected to the ground contact base 311, in the second communication position, the moving contact 314 is electrically connected to the contact-on contact base 313, and by operating the moving contact 314, the moving contact 314 can be driven to move between the first communication position and the second communication position.

Specifically, the three-position switch mechanism 300 and the circuit breaker mechanism 200 are fixed on the same sealing plate 100, the contact-on base 313 or the isolation contact base 312 is electrically connected to the solid-sealed polar pole 210, the moving contact 314 is electrically connected to the isolation contact base 312, and the moving contact 314 can move between the first communication position and the second communication position by operating the moving contact 314, so that the moving contact 314 can be switched between the grounding position, the isolation position and the contact-on position, thereby reducing the volume and improving the assembly efficiency on the premise of meeting the basic performance.

Wherein, since the moving contact 314 is electrically connected to the isolation contact base 312, when the moving contact 314 is located at the first communication position, the ground contact base 311 is in communication with the isolation contact base 312 through the moving contact 314, when the moving contact 314 is located at the second communication position, the isolation contact base 312 is in communication with the connection contact base 313 through the moving contact 314, and when the moving contact 314 is located between the first communication position and the second communication position, the moving contact 314 is only electrically connected with the isolation contact base 312, thereby enabling to switch among the ground position, the isolation position and the connection position.

It should be noted that, the electrical switching apparatus provided by the present application is applied to an air-filled cabinet, and the case is used for sealing, and the ground contact seat 311 and the solid-sealed polar pole 210 are located at the same side.

Referring to fig. 1 and 3, fig. 3 is a schematic view of an insulating support in an electrical switching apparatus according to an embodiment of the present application. In one embodiment, one end of the insulating support 440 is provided with a boss 441 and at least one groove 442 circumferentially surrounding the boss 441, and the boss 441 is used for connecting with the contact base 313.

Specifically, the provision of the grooves 442 increases the surface area of the insulating support 440, thereby increasing the creepage distance and improving the insulating performance.

Referring to fig. 1 and 3, in one embodiment, the insulating support 440 is provided with a first protrusion 446 and a second protrusion 447 disposed around the circumferential direction, the first protrusion 446 surrounds the boss 441 and forms a groove 442 with the outer circumferential surface of the boss 441, and the second protrusion 447 surrounds the first protrusion 446 and forms a groove 442 with the outer circumferential surface of the first protrusion 446, so as to further increase the creepage distance.

Further, the first protrusion 446 is protruded with respect to the second protrusion 447, and the boss 441 is protruded with respect to the first protrusion 446 to form a wavy edge, thereby increasing the electrical distance and improving the insulation performance.

Referring to fig. 1 and 3, in one embodiment, the three-position switch mechanism 300 further includes a fastener 444 and a sealing ring 445, a mounting hole 448 is provided on a side of the insulating support member 440 facing away from the contact base 313, the fastener 444 penetrates through the mounting hole 448 and is connected to the box body, and the sealing ring 445 is disposed between the box body wall and the insulating support member 440 and surrounds the mounting hole 448 to seal the mounting hole 448.

Specifically, the fastener 444 penetrates the case wall and the mounting hole 448 and cooperates with the insulating support 440 to fix the insulating support 440 to the case wall, thereby stably supporting the contact base 313. Wherein, set up the sealing washer 445 that encloses and locate mounting hole 448 between box wall and insulating support 440 to can seal the junction between insulating support 440 and the box wall, guarantee the gas tightness of box.

Further, a sealing groove 443 is disposed on one side of the insulating support member 440 away from the contact base 313, the sealing groove 443 encloses the mounting hole 448 and is used for accommodating the sealing ring 445, so as to locate the sealing ring 445, and the sealing ring 445 can stably seal the connection between the insulating support member 440 and the wall of the box body.

Referring to fig. 1 and 2, in one embodiment, the contact pad 313 is electrically connected to the encapsulated pole 210, and the electrical switching apparatus further includes an outlet sleeve 410, wherein the outlet sleeve 410 is electrically connected to the isolation contact pad 312.

Specifically, by connecting the contact base 313 to the solid-sealed polar pole 210, and connecting the outlet sleeve 410 to the isolated contact base 312, when the moving contact 314 is located at the first connection position, the outlet sleeve 410 can be grounded without other components, thereby further reducing the volume of the device while meeting the requirement of diversified maintenance states of users, realizing compact overall structure, miniaturization and simplification, and reducing the processing cost.

Further, the electrical switching apparatus further includes a supporting copper block 450, one end of the supporting copper block 450 is connected to the connection contact 313, and the other end is connected to the wire outlet 211 of the solid-sealed pole 210, so as to electrically connect the connection contact 313 and the solid-sealed pole 210. Since the contact base 313 is fixed on the wall of the case through the insulating support 440, the solid-sealed pole 210 can be supported by the arrangement of the supporting copper block 450, and the stability of the apparatus can be improved.

Referring to fig. 1 and 2, in one embodiment, the three-position switching mechanism 300 further includes a connection copper bar 430, one end of the connection copper bar 430 is connected to the isolation contact 312, and the other end is connected to the outlet sleeve 410.

Specifically, the connection copper bars 430 are used to electrically connect the isolation contact 312 and the outlet sleeve 410, and meanwhile, the isolation contact 312 is supported, so that the stability of the isolation contact 312 is improved.

After the circuit breaker is switched on, the outlet end 211 of the solid-sealed pole 210 is communicated with the switch-on contact base 313 through the supporting copper block 450, the isolation contact base 312 is communicated with the switch-on contact base 313 through the moving contact 314, and is communicated with the outlet sleeve 410 through the connecting copper bar 430, so that loop conduction is realized.

Referring to fig. 1 and 2, in one embodiment, the three-position switch mechanism 300 further includes an operating device 320, where the operating device 320 includes a driving member 321 and a screw rod 322, the driving member 321 is mounted on the sealing plate 100, the screw rod 322 is in driving connection with the driving member 321, the moving contact 314 is in threaded connection with the screw rod 322, and the moving contact 314 is at least partially accommodated in the isolating contact seat 312, and the isolating contact seat 312 is located between the grounding contact seat 311 and the connecting contact seat 313; the moving contact 314 is configured to move in the arrangement direction of the ground contact seat 311 and the contact-on seat 313 during rotation of the screw 322 driven by the driving member 321, so that the moving contact 314 moves between the first communication position and the second communication position.

Specifically, the ground contact seat 311, the isolation contact seat 312 and the connection contact seat 313 are arranged at intervals along the axial direction of the screw rod 322, the screw rod 322 is arranged through the moving contact 314 and is in threaded connection with the moving contact 314, and the moving contact 314 is at least partially accommodated in the isolation contact seat 312, so that the moving contact 314 is always electrically connected with the isolation contact seat 312, and the rotation of the moving contact 314 is limited. When the screw rod 322 rotates around the axis of the screw rod 322 under the drive of the driving piece 321, the moving contact 314 can be driven to move along the axial direction of the screw rod 322 through screw transmission, so that the moving contact 314 can move between a first communication position and a second communication position. The application adopts a direct-acting structure, so that the electric field is uniformly distributed, the coaxiality is effectively ensured, the electric performance of the product is ensured, and the reliability of the whole power supply system is further improved.

Referring to fig. 1, fig. 2 and fig. 4, fig. 4 is a schematic diagram of an isolation contact in an electrical switching apparatus according to an embodiment of the application. In one embodiment, a mating hole 315 through which the moving contact 314 passes is provided in the isolating contact base 312, and elastic contact fingers 316 are provided at two ends of the mating hole 315, where the elastic contact fingers 316 are used to abut against the moving contact 314.

Specifically, the moving contact 314 abuts against the elastic contact finger 316, so that the moving contact 314 contacts the isolation contact seat 312 more firmly, and the conductivity is further improved.

Further, a gap is formed between the moving contact 314 and the hole wall of the mating hole 315, so that friction between the moving contact 314 and the hole wall of the mating hole 315 can be avoided, generation of metal scraps is reduced, and electric field stability is improved in the moving process of the moving contact 314 relative to the hole wall of the mating hole 315.

Referring to fig. 1, fig. 2 and fig. 5, fig. 5 is a schematic view of a portion of an operating device in an electrical switching apparatus according to an embodiment of the application. In one embodiment, the operation device 320 further includes three driven gears 323 and a transmission member, where the three driven gears 323 are respectively connected with the lead screws 322 corresponding to the moving contacts 314 of each phase, the transmission member is in transmission connection with the three driven gears 323, and the transmission member is configured to drive the three driven gears 323 to rotate synchronously under the driving of the driving member 321.

Specifically, the three driven gears 323 are connected through the transmission part in a transmission way, so that three phases are linked through the transmission part, the synchronism of three-phase actions is ensured, the product structure is effectively simplified, and the miniaturization of the product is realized.

In this embodiment, the switching-on/off process of the three-position switch is only indicated by a single-phase operation.

Referring to fig. 1, 2 and 5, in one embodiment, the transmission member includes three transmission chains 324, the three-position switching mechanism 300 further includes a driving gear 325, the driving gear 325 is connected to the output end of the driving member 321, the driven gears 323 located in the middle position are respectively tensioned with two adjacent driven gears 323 to one transmission chain 324, and the driving gear 325 and one driven gear 323 are tensioned with one transmission chain 324.

Specifically, the driving member 321 drives the driving gear 325 to rotate, the driving gear 325 drives the corresponding driven gear 323 to rotate through the corresponding transmission chain 324, and then drives the other two driven gears 323 to rotate through the linkage of the tensioned transmission chain 324, so as to realize the rotation of the lead screw 322 corresponding to the three-phase moving contact 314. In the embodiment, the mode of gears and racks is adopted for transmission, so that the action is more stable.

Referring to fig. 1 and 2, the embodiment of the application further includes an inflatable cabinet, including a cabinet body and the electrical switching apparatus, where the electrical switching apparatus is installed in the cabinet body. According to the application, the three-station switch mechanism 300 and the circuit breaker mechanism 200 are fixed on the same sealing plate 100, the contact-on base 313 or the isolation contact base 312 is electrically connected to the solid-sealed pole 210, the moving contact 314 is electrically connected to the isolation contact base 312, and the moving contact 314 is operated to enable the moving contact 314 to move between a first communication position and a second communication position, so that the switching among a grounding position, an isolation position and a connection position is realized, on the premise of meeting basic performances, the size is reduced, the assembly efficiency is improved, in addition, the isolation contact base 312 is fixed through the supporting insulator 420, the connection contact base 313 is connected with the wall of the box body through the insulating supporting piece 440, and the force applied to the solid-sealed pole 210 is avoided, so that the sinking risk of the solid-sealed pole 210 is reduced, and the stability and reliability of the gas-filled cabinet are improved.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.

Claims

1. An electrical switching apparatus, the electrical switching apparatus comprising:

the box body comprises a sealing plate;

2. An electrical switching apparatus as claimed in claim 1, wherein one end of the insulating support is provided with a boss for connection with the contact socket and at least one recess circumferentially surrounding the boss.

3. The electrical switching apparatus of claim 1 wherein the three-position switching mechanism further comprises a fastener and a seal ring, wherein a mounting hole is formed in a side of the insulating support facing away from the contact, the fastener is disposed through the mounting hole and connected to the housing, and the seal ring is disposed between the housing wall and the insulating support and surrounds the mounting hole to seal the mounting hole.

4. The electrical switching apparatus of claim 1 wherein the make contact is electrically connected to the encapsulated pole, the electrical switching apparatus further comprising an outlet sleeve electrically connected to the isolation contact.

5. The electrical switching apparatus of claim 4 wherein the three-position switching mechanism further comprises a connecting copper bar having one end connected to the isolation contact and the other end connected to the outlet sleeve.

6. The electrical switching apparatus of any one of claims 1-5 wherein the three-position switching mechanism further comprises an operating device including a drive member and a lead screw, the drive member being mounted to the seal plate, the lead screw being drivingly connected to the drive member, the moving contact being threadably connected to the lead screw, and the moving contact being at least partially received in the isolation contact, the isolation contact being located between the ground contact and the make contact;

7. The electrical switching apparatus as recited in claim 6, wherein a mating hole through which the moving contact passes is provided in the isolation contact base, and elastic contact fingers are provided at both ends of the mating hole, and the elastic contact fingers are adapted to abut against the moving contact.

8. The electrical switching apparatus of claim 6 wherein the operating means further comprises three driven gears respectively connected to the lead screws corresponding to the moving contacts of each phase, and a transmission member drivingly connected to the three driven gears, the transmission member being configured to drive the three driven gears to rotate synchronously under the drive of the driving member.

9. The electrical switching apparatus of claim 8 wherein said drive member includes three drive chains, said three position switching mechanism further including a drive gear connected to an output of said drive member, said driven gears in intermediate positions being respectively tensioned to one of said drive chains with adjacent two of said driven gears, said drive gear being tensioned to one of said drive chains with one of said driven gears.

10. An inflatable cabinet comprising a cabinet body and the electrical switching apparatus of any one of claims 1 to 9, the electrical switching apparatus being mounted within the cabinet body.