CN219370833U - Switching device - Google Patents

Abstract

The present utility model provides a switching device comprising: a support on which a moving contact mounting chamber extending in a predetermined direction is provided; the two fixed contact assemblies are arranged at intervals with the support and are respectively positioned at two opposite ends of the moving contact mounting cavity so as to form two fractures; the movable contact assembly is movably arranged in the movable contact mounting cavity along a preset direction so as to be respectively spliced or separated with the two fixed contact assemblies, so that opening or closing actions are realized, and the movable contact assembly comprises a movable contact extending along the preset direction and an air cavity arranged on the movable contact; the separation component comprises a separation component which is arranged in the air cavity and fixedly connected with the support after passing through the moving contact, so as to separate the air cavity into two cavities; in the switching-off process, the gas in the corresponding cavity is compressed through the movement of the movable contact assembly relative to the separation assembly so as to be sprayed to the corresponding fracture, so that the problem that the three-station isolating switch in the prior art is weak in switching-on and switching-off capability is solved.

Description

Switching device

Technical Field

The utility model relates to the technical field of switching-on and switching-off of high-voltage electric appliances, in particular to a switching device.

Background

At present, there are various three-position isolating switches, which comprise a support and moving contacts movably arranged on the support, wherein two opposite sides of the support are respectively provided with a fixed contact, and the moving contacts can be driven to move through a driving mechanism so as to be switched on with one fixed contact and switched off with the other fixed contact.

However, the three-station isolating switch in the prior art has lower opening speed, and the insulation effect is improved mainly by increasing the opening distance when the three-station isolating switch is opened, so that the opening capability of the three-station isolating switch is weaker.

Disclosure of Invention

The utility model mainly aims to provide a switching device which solves the problem that a three-station isolating switch in the prior art is weak in breaking capacity.

In order to achieve the above object, the present utility model provides a switching device including: the support is provided with a moving contact mounting cavity extending along a preset direction; the two fixed contact assemblies are arranged at intervals with the support and are respectively positioned at the two opposite ends of the moving contact mounting cavity so as to form two fractures; the movable contact assembly is movably arranged in the movable contact mounting cavity along a preset direction, so that the movable contact assembly is respectively spliced or separated with the two fixed contact assemblies to realize opening or closing actions, and the movable contact assembly comprises a movable contact extending along the preset direction and an air cavity arranged on the movable contact; the separation assembly comprises a separation component which is arranged in the air cavity and fixedly connected with the support after passing through the moving contact, so that the air cavity is separated into two cavities corresponding to the two fixed contact assemblies one by one; in the opening process, the moving contact assembly moves relative to the separation assembly to compress the gas in the corresponding cavity, so that the gas is sprayed to the corresponding fracture, and the breaking capacity of the switching device is enhanced.

Further, the moving contact assembly further comprises a moving contact guide sleeve sleeved outside the moving contact, the moving contact is in sliding connection with the support through the moving contact guide sleeve, the air cavity is arranged in the moving contact, and the moving contact further comprises two first plug holes which are respectively arranged at two opposite ends of the air cavity and are communicated with the air cavity.

Further, each stationary contact assembly includes: the fixed contact comprises a second plug hole for being in plug-in fit with the end part of the movable contact; the static arc contact is arranged in the second plug hole and is arranged at intervals with the hole wall surface of the second plug hole, so as to be inserted into the second plug hole of the corresponding moving contact to be in contact with the inner wall surface of the second plug hole; the second spring contact finger is arranged in the second plug hole and is positioned on the hole wall surface of the second plug hole, and the fixed contact is contacted with the outer wall surface of the moving contact through the second spring contact finger.

Further, the partition member includes: the sleeve is arranged in the air cavity; the partition plate is arranged in the sleeve to divide the inner hole of the sleeve into two hole bodies, and the two hole bodies are communicated with the two cavities in a one-to-one correspondence manner; the movable contact is provided with an avoidance sliding groove for avoiding the grafting bulge.

Further, the plurality of plug-in protrusions are arranged at intervals around the circumference of the sleeve; the plurality of avoidance sliding grooves are arranged in a one-to-one correspondence with the plurality of grafting protrusions; the length of the avoidance sliding groove in the preset direction is larger than that of the insertion protrusion in the preset direction.

Further, the separation assembly comprises a separation part guide sleeve, the separation part guide sleeve is sleeved outside the sleeve, and the moving contact is in sliding connection with the sleeve through the separation part guide sleeve.

Further, the number of the separation part guide sleeves is multiple, and the plurality of the separation part guide sleeves are sleeved on the sleeve so as to seal the gap between the sleeve and the air cavity.

Further, the switching device further comprises a driving assembly, the support comprises a driving assembly installation cavity communicated with the moving contact installation cavity, and the driving assembly is arranged in the driving assembly installation cavity and is in driving connection with the moving contact assembly so as to drive the moving contact assembly to move along a preset direction.

Further, the drive assembly includes: the rotating shaft is rotatably arranged in the driving component mounting cavity; the gear is arranged on the rotating shaft to rotate along with the rotating shaft, a rack is arranged on the outer peripheral surface of the moving contact, and the gear is meshed with the rack to drive the moving contact to move through the rack.

Further, two first spring contact fingers are arranged in the moving contact installation cavity, and the two first spring contact fingers are installed on the cavity wall surface of the moving contact installation cavity and are respectively positioned at two ends of the moving contact installation cavity so as to be respectively contacted with two ends of the moving contact through the two first spring contact fingers.

By applying the technical scheme of the utility model, the switching device comprises: the support is provided with a moving contact mounting cavity extending along a preset direction; the two fixed contact assemblies are arranged at intervals with the support and are respectively positioned at the two opposite ends of the moving contact mounting cavity so as to form two fractures; the movable contact assembly is movably arranged in the movable contact mounting cavity along a preset direction, so that the movable contact assembly is respectively spliced or separated with the two fixed contact assemblies to realize opening or closing actions, and the movable contact assembly comprises a movable contact extending along the preset direction and an air cavity arranged on the movable contact; the separation assembly comprises a separation component which is arranged in the air cavity and fixedly connected with the support after passing through the moving contact, so that the air cavity is separated into two cavities corresponding to the two fixed contact assemblies one by one; in the opening process, the moving contact assembly moves relative to the separation assembly to compress the gas in the corresponding cavity, so that the gas is sprayed to the corresponding fracture, and the breaking capacity of the switching device is enhanced. Therefore, the switch device is a three-station disconnecting switch adopting direct-acting transmission in gas-insulated metal-enclosed switchgear, and the air cavity of the moving contact is divided into two cavities by arranging the separation component, so that an arc generated by blowing to a corresponding fracture is eliminated when the switch is opened, the insulating effect during opening can be improved without increasing the opening distance, the opening capacity and the opening voltage of the disconnecting switch are improved, the product performance of the disconnecting switch is greatly improved, and the problem that the opening capacity of the three-station disconnecting switch in the prior art is weaker is solved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model. In the drawings:

fig. 1 shows a cross-sectional view of an embodiment of a switching device according to the utility model;

FIG. 2 shows a cross-sectional view of the switching device shown in FIG. 1 along the A-A direction;

FIG. 3 shows a cross-sectional view of the support of the switching device shown in FIG. 1;

fig. 4 shows a cross-sectional view of a moving contact of the moving contact assembly of the switching device shown in fig. 1;

FIG. 5 shows a cross-sectional view of a spacer assembly of the switchgear shown in FIG. 1;

FIG. 6 illustrates a front view of a divider assembly of the switching device shown in FIG. 5;

FIG. 7 illustrates a side view of a separation assembly of the switchgear shown in FIG. 5;

fig. 8 shows a cross-sectional view of the switching device shown in fig. 1 with the first break in the closed position;

fig. 9 shows a cross-sectional view of the switching device shown in fig. 8 with the first break in the opening process;

fig. 10 shows a cross-sectional view of the switching device shown in fig. 1 with the second break in the closed position;

fig. 11 shows a cross-sectional view of the switching device shown in fig. 10 with the second break in the opening process.

Wherein the above figures include the following reference numerals:

100. a fracture; 101. a first fracture; 102. a second fracture;

10. a support; 110. a moving contact mounting cavity; 120. a drive assembly mounting cavity; 130. the first spring contact finger;

20. a moving contact assembly; 201. a moving contact; 21. an air cavity; 211. a first cavity; 212. a second cavity; 22. a first plug hole; 23. avoiding the chute; 24. a rack; 202. a moving contact guide sleeve;

30. a stationary contact assembly; 310. a first stationary contact assembly; 320. a second stationary contact assembly; 301. a stationary contact; 3010. a second plug hole; 302. the second spring contact finger; 303. static arc contacts;

40. a partition assembly; 401. a first hole body; 402. a second aperture body; 41. a sleeve; 42. inserting the bulge; 43. a partition member guide sleeve; 44. a partition plate;

50. a drive assembly; 51. a gear; 52. a rotating shaft.

Detailed Description

It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The utility model will be described in detail below with reference to the drawings in connection with embodiments.

As shown in fig. 1 to 11, the present utility model provides a switching device including: the movable contact mounting device comprises a support 10, wherein a movable contact mounting cavity 110 extending along a preset direction is arranged on the support 10; the two fixed contact assemblies 30 are arranged at intervals with the support 10 and are respectively positioned at two opposite ends of the moving contact mounting cavity 110 to form two fractures 100; the movable contact assembly 20 is movably arranged in the movable contact mounting cavity 110 along a preset direction, so that the movable contact assembly 20 is respectively spliced or separated with the two fixed contact assemblies 30 to realize a switching-off or switching-on action, and the movable contact assembly 20 comprises a movable contact 201 extending along the preset direction and an air cavity 21 arranged on the movable contact 201; the separation assembly 40, the separation assembly 40 includes the separation part that is set up in air cavity 21 and fixedly connected with support 10 after passing the moving contact 201, in order to separate the air cavity 21 into two cavities corresponding to two static contact assemblies 30 one by one; during the opening process, the moving contact assembly 20 moves relative to the separation assembly 40 to compress the gas in the corresponding cavity, so that the gas is sprayed to the corresponding fracture 100, thereby enhancing the opening and closing capability of the switching device.

In this way, the switching device is a three-station disconnecting switch adopting direct-acting transmission in gas-insulated metal-enclosed switchgear, and the air cavity 21 of the moving contact 201 is divided into two cavities by arranging the separation component 40, so that an arc generated by blowing to the corresponding fracture 100 is eliminated when the switch is opened, the insulating effect during the opening can be improved without increasing the opening distance, the opening capacity and the opening voltage of the disconnecting switch are improved, the product performance of the disconnecting switch is greatly improved, and the problem that the opening capacity of the three-station disconnecting switch in the prior art is weaker is solved.

Specifically, the two static contact assemblies 30 are a first static contact assembly 310 and a second static contact assembly 320, a first fracture 101 is formed between the support 10 and the first static contact assembly 310, a second fracture 102 is formed between the support 10 and the second static contact assembly 320, the moving contact 201 is in a circular tube structure, the first part of the separation component separates the air cavity 21 into a first cavity 211 and a second cavity 212, the first cavity 211 is correspondingly arranged with the first fracture 101 and the first static contact assembly 310, and the second cavity 212 is correspondingly arranged with the second fracture 102 and the second static contact assembly 320.

As shown in fig. 1 to 11, the moving contact assembly 20 further includes a moving contact guide sleeve 202 sleeved outside the moving contact 201, the moving contact 201 is slidably connected with the support 10 through the moving contact guide sleeve 202, the air cavity 21 is disposed in the moving contact 201, and the moving contact 201 further includes two first plug holes 22 respectively disposed at opposite ends of the air cavity 21 and communicated with the air cavity 21.

As shown in fig. 1 to 11, each of the stationary contact assemblies 30 includes: a fixed contact 301, the fixed contact 301 including a second insertion hole 3010 for insertion-fit with an end of the moving contact 201; the static arc contact 303 is arranged in the second plug hole 3010 and is arranged at intervals with the hole wall surface of the second plug hole 3010, so as to be inserted in the second plug hole 3010 of the corresponding moving contact 201 to be in contact with the inner wall surface of the second plug hole 3010; the second spring contact finger 302 is disposed in the second plugging hole 3010 and is located on the hole wall surface of the second plugging hole 3010, and the stationary contact 301 is contacted with the outer wall surface of the moving contact 201 through the second spring contact finger 302.

Specifically, the support 10 and the moving contact 201 are both conductors, the air cavity 21 is a cylindrical cavity, the first plug hole 22 is a round hole, and the inner diameter of the air cavity 21 is larger than the inner diameter of the first plug hole 22.

The moving contact guide sleeve 202 is made of polytetrafluoroethylene, so that supporting, lubricating and sealing functions are achieved between the moving contact 201 and the support 10.

As shown in fig. 1 to 11, the partition member includes: a sleeve 41, the sleeve 41 being disposed within the air chamber 21; a partition plate 44, the partition plate 44 being disposed in the sleeve 41 to partition an inner hole of the sleeve 41 into two hole bodies, the two hole bodies being communicated with the two cavities in one-to-one correspondence; the plug-in bulge 42, the plug-in bulge 42 is arranged on the outer peripheral surface of the sleeve 41, the movable contact 201 is provided with a dodging chute 23 for dodging the plug-in bulge 42, and the plug-in bulge 42 passes through the dodging chute 23 and is fixedly connected with the movable contact mounting cavity 110 so as to enable the separation assembly 40 and the support 10 to be relatively fixed.

Wherein, two hole bodies are first hole body 401 and second hole body 402 respectively, and first hole body 401 communicates with first cavity 211, and second hole body 402 communicates with second cavity 212.

Specifically, the plurality of insertion projections 42 are provided, and the plurality of insertion projections 42 are arranged at intervals around the circumferential side of the sleeve 41; the plurality of avoidance sliding grooves 23 are arranged, and the plurality of avoidance sliding grooves 23 are arranged in one-to-one correspondence with the plurality of grafting protrusions 42; wherein the length of the escape chute 23 in the predetermined direction is greater than the length of the insertion projection 42 in the predetermined direction.

As shown in fig. 1 to 11, the partition assembly 40 includes a partition member guide sleeve 43, the partition member guide sleeve 43 is sleeved outside the sleeve 41, and the moving contact 201 is slidably connected with the sleeve 41 through the partition member guide sleeve 43.

Wherein the partition member guide sleeve 43 is made of polytetrafluoroethylene to perform supporting, lubricating and sealing functions between the moving contact 201 and the sleeve 41.

Specifically, the number of the partition member guide sleeves 43 is plural, and the plural partition member guide sleeves 43 are spaced apart from each other around the sleeve 41 to close off the gap between the sleeve 41 and the air chamber 21.

As shown in fig. 1 to 11, the switching device further includes a driving assembly 50, and the holder 10 includes a driving assembly mounting chamber 120 communicating with the moving contact mounting chamber 110, and the driving assembly 50 is disposed in the driving assembly mounting chamber 120 and is drivingly connected with the moving contact assembly 20 to drive the moving contact assembly 20 to move in a predetermined direction.

Specifically, the drive assembly 50 includes: a spindle 52, the spindle 52 rotatably mounted in the drive assembly mounting cavity 120; and a gear 51, wherein the gear 51 is arranged on the rotating shaft 52 to rotate along with the rotating shaft 52, the outer circumferential surface of the moving contact 201 is provided with a rack 24, and the gear 51 is meshed with the rack 24 so as to drive the moving contact 201 to move through the rack 24.

As shown in fig. 1 to 11, two first spring contact fingers 130 are disposed in the moving contact mounting cavity 110, and the two first spring contact fingers 130 are mounted on the cavity wall surface of the moving contact mounting cavity 110 and are respectively located at two ends of the moving contact mounting cavity 110 so as to respectively contact two ends of the moving contact 201 through the two first spring contact fingers 130.

Specifically, the stationary contact 301 and the stationary arcing contact 303 are both conductors.

The movement process of the switching device of the utility model is as follows:

(1) As shown in fig. 1, the first fracture 101 and the second fracture 102 are both in a separated state.

(2) The positions of the support 10 and the separation assembly 40 are fixed, when the gear 51 rotates anticlockwise, the gear 51 drives the rack 24 to move leftwards, so that the moving contact 201 moves leftwards, the first fracture 101 reaches the closing position shown in fig. 8, and the support 10, the moving contact assembly 20 and the first static contact assembly 310 are electrically connected.

(3) As shown in fig. 9, in the opening process, when the gear 51 rotates clockwise, the gear 51 drives the rack 24 to move rightward, so that the moving contact 201 moves rightward, and the moving contact 201 and the first stationary contact assembly 310 are separated and arc is generated; the gas in the first cavity 211 is compressed to be ejected from the first insertion hole 22 on the left side of the movable contact 201, thereby blowing out the arc.

(4) When the gear 51 continues to rotate clockwise, the switching device returns to the state shown in fig. 1.

(5) When the gear continues to rotate clockwise, the gear 51 drives the rack 24 to move rightward, so that the moving contact 201 moves rightward, the second fracture 102 reaches the closing position shown in fig. 10, and the support 10, the moving contact assembly 20 and the second static contact assembly 320 are electrically connected.

(6) As shown in fig. 11, in the opening process, when the gear rotates counterclockwise, the gear 51 drives the rack 24 to move leftward, so that the moving contact 201 moves leftward, and the moving contact 201 and the second stationary contact assembly 320 are separated and arc is generated; the gas in the second chamber 212 is compressed to be ejected from the first insertion hole 22 on the right side of the movable contact 201, thereby blowing out the arc.

(7) When the gear 51 continues to rotate counterclockwise, the switching device returns to the state shown in fig. 1.

From the above description, it can be seen that the above embodiments of the present utility model achieve the following technical effects:

the switching device of the present utility model includes: the movable contact mounting device comprises a support 10, wherein a movable contact mounting cavity 110 extending along a preset direction is arranged on the support 10; the two fixed contact assemblies 30 are arranged at intervals with the support 10 and are respectively positioned at two opposite ends of the moving contact mounting cavity 110 to form two fractures 100; the movable contact assembly 20 is movably arranged in the movable contact mounting cavity 110 along a preset direction, so that the movable contact assembly 20 is respectively spliced or separated with the two fixed contact assemblies 30 to realize a switching-off or switching-on action, and the movable contact assembly 20 comprises a movable contact 201 extending along the preset direction and an air cavity 21 arranged on the movable contact 201; the separation assembly 40, the separation assembly 40 includes the separation part that is set up in air cavity 21 and fixedly connected with support 10 after passing the moving contact 201, in order to separate the air cavity 21 into two cavities corresponding to two static contact assemblies 30 one by one; during the opening process, the moving contact assembly 20 moves relative to the separation assembly 40 to compress the gas in the corresponding cavity, so that the gas is sprayed to the corresponding fracture 100, thereby enhancing the opening and closing capability of the switching device. In this way, the switching device is a three-station disconnecting switch adopting direct-acting transmission in gas-insulated metal-enclosed switchgear, and the air cavity 21 of the moving contact 201 is divided into two cavities by arranging the separation component 40, so that an arc generated by blowing to the corresponding fracture 100 is eliminated when the switch is opened, the insulating effect during the opening can be improved without increasing the opening distance, the opening capacity and the opening voltage of the disconnecting switch are improved, the product performance of the disconnecting switch is greatly improved, and the problem that the opening capacity of the three-station disconnecting switch in the prior art is weaker is solved.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the authorization specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

In the description of the present application, it should be understood that, where azimuth terms such as "front, rear, upper, lower, left, right", "transverse, vertical, horizontal", and "top, bottom", etc., indicate azimuth or positional relationships generally based on those shown in the drawings, only for convenience of description and simplification of the description, these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present application; the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

In addition, the terms "first", "second", etc. are used to define the components, and are merely for convenience of distinguishing the corresponding components, and unless otherwise stated, the terms have no special meaning, and thus should not be construed as limiting the scope of the present application.

The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims (10)

1. A switching device, comprising:

the movable contact mounting device comprises a support (10), wherein a movable contact mounting cavity (110) extending along a preset direction is arranged on the support (10);

the two fixed contact assemblies (30) are arranged at intervals with the support (10) and are respectively positioned at two opposite ends of the movable contact mounting cavity (110) so as to form two fractures (100);

a moving contact assembly (20), wherein the moving contact assembly (20) is movably arranged in the moving contact mounting cavity (110) along the preset direction so as to enable the moving contact assembly (20) to be respectively connected with or separated from the two fixed contact assemblies (30) in an inserting mode so as to realize opening or closing actions, and the moving contact assembly (20) comprises a moving contact (201) extending along the preset direction and an air cavity (21) arranged on the moving contact (201);

the separation assembly (40) comprises a separation part which is arranged in the air cavity (21) and fixedly connected with the support (10) after passing through the moving contact (201), so as to separate the air cavity (21) into two cavities corresponding to the two static contact assemblies (30) one by one;

during the opening process, the moving contact assembly (20) moves relative to the separation assembly (40) to compress the gas in the corresponding cavity, so that the gas is sprayed to the corresponding fracture (100) to enhance the opening and closing capacity of the switching device.

2. The switching device according to claim 1, wherein the moving contact assembly (20) further comprises a moving contact guide sleeve (202) sleeved outside the moving contact (201), the moving contact (201) is slidably connected with the support (10) through the moving contact guide sleeve (202), the air cavity (21) is arranged in the moving contact (201), and the moving contact (201) further comprises two first plug holes (22) respectively arranged at two opposite ends of the air cavity (21) and communicated with the air cavity (21).

3. The switching device according to claim 2, wherein each of said stationary contact assemblies (30) comprises:

a fixed contact (301), wherein the fixed contact (301) comprises a second plug hole (3010) for plug-in fit with the end part of the movable contact (201);

a static arc contact (303) which is arranged in the second plug hole (3010) and is arranged at intervals with the hole wall surface of the second plug hole (3010) so as to be inserted in the second plug hole (3010) of the corresponding moving contact (201) to be in contact with the inner wall surface of the second plug hole (3010);

the second spring contact finger (302) is arranged in the second plug hole (3010) and is positioned on the hole wall surface of the second plug hole (3010), and the fixed contact (301) is contacted with the outer wall surface of the moving contact (201) through the second spring contact finger (302).

4. The switching device according to claim 1, wherein the partition member includes:

-a sleeve (41), said sleeve (41) being arranged inside said air cavity (21);

the separation plate (44) is arranged in the sleeve (41) to separate an inner hole of the sleeve (41) into two hole bodies, and the two hole bodies are communicated with the two cavities in a one-to-one correspondence manner;

the movable contact (201) is provided with an avoidance sliding groove (23) for avoiding the grafting protrusion (42).

5. A switching device according to claim 4, wherein,

the plurality of the plug-in protrusions (42) are arranged at intervals around the circumference of the sleeve (41);

the plurality of avoidance sliding grooves (23) are arranged, and the plurality of avoidance sliding grooves (23) and the plurality of plugging protrusions (42) are arranged in a one-to-one correspondence manner;

wherein the length of the avoiding sliding groove (23) in the preset direction is larger than the length of the inserting protrusion (42) in the preset direction.

6. The switching device according to claim 4, wherein the partition assembly (40) comprises a partition member guide sleeve (43), the partition member guide sleeve (43) is sleeved outside the sleeve (41), and the moving contact (201) is slidably connected with the sleeve (41) through the partition member guide sleeve (43).

7. The switching device according to claim 6, wherein the number of the partition member guide sleeves (43) is plural, and the plural partition member guide sleeves (43) are fitted over the sleeve (41) to seal a gap between the sleeve (41) and the air chamber (21).

8. The switching device according to claim 1, further comprising a drive assembly (50), wherein the carrier (10) comprises a drive assembly mounting cavity (120) in communication with the moving contact mounting cavity (110), wherein the drive assembly (50) is disposed within the drive assembly mounting cavity (120) and in driving connection with the moving contact assembly (20) for driving the moving contact assembly (20) to move in the predetermined direction.

9. Switching device according to claim 8, characterized in that the drive assembly (50) comprises:

a spindle (52), the spindle (52) rotatably mounted within the drive assembly mounting cavity (120);

the gear (51), the gear (51) is installed on the pivot (52) in order to follow pivot (52) rotation, be provided with rack (24) on the outer peripheral face of moving contact (201), the gear (51) with rack (24) intermeshing, in order to pass through rack (24) drive moving contact (201) motion.

10. The switching device according to claim 1, wherein two first spring contact fingers (130) are disposed in the moving contact mounting cavity (110), and the two first spring contact fingers (130) are mounted on a cavity wall surface of the moving contact mounting cavity (110) and are respectively located at two ends of the moving contact mounting cavity (110) so as to be respectively contacted with two ends of the moving contact (201) through the two first spring contact fingers (130).