CN217588715U

CN217588715U - Contact assembly, switch unit and switching device

Info

Publication number: CN217588715U
Application number: CN202221208556.6U
Authority: CN
Inventors: 付青松; 巴飞; 刘世兴; 任山波
Original assignee: Shanghai Liangxin Electrical Co Ltd
Current assignee: Shanghai Liangxin Electrical Co Ltd
Priority date: 2022-05-11
Filing date: 2022-05-11
Publication date: 2022-10-14
Anticipated expiration: 2032-05-11

Abstract

A contact assembly, a switch unit and a switching device relate to the technical field of electrical switches. The contact assembly comprises a moving contact and a fixed contact, wherein the moving contact is driven to rotate to match with the fixed contact to be switched on and off, and when the moving contact and the fixed contact are switched on and off, one side of the moving contact, which is used for being contacted with the fixed contact, and one side of the fixed contact, which is used for being contacted with the moving contact, are parallel or basically parallel to each other. The contact assembly can increase the contact area between the moving contact and the static contact when the moving contact and the static contact are switched on and off, thereby avoiding fusion welding phenomenon caused by the problems of overlarge current density and too fast temperature rise at the contact point, and further effectively improving the safety performance of the contact assembly, the switch unit and the switch electric appliance.

Description

Contact assembly, switch unit and switching device

Technical Field

The utility model relates to an electrical switch technical field particularly, relates to a contact subassembly, switch unit and switching apparatus.

Background

The switching device plays two roles in the power system: the control function is that a part of power equipment or lines are put into or quit operation according to the operation requirement of a power system; and the other is a protection function, namely when the power equipment or the line has a fault, the fault part is quickly cut off from the power system, and the normal operation of the fault-free part of the power system is ensured.

In the prior art, a moving contact of a switching device can rotate relative to a fixed contact to be far away from or close to the fixed contact, so that switching on and off are realized. In the existing product, the contact surfaces of the moving contact and the static contact respectively protrude towards one side close to the other side, so that when the moving contact and the static contact are switched in an opening and closing state, the contact mode between the moving contact and the static contact is point contact, the problem of overlarge current density at the contact point exists, the temperature at the contact point is increased too fast, the fusion welding phenomenon is very easy to occur, and the safety performance of a switching device is influenced.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a contact subassembly, switch element and switching apparatus can increase moving contact and static contact area between the two when divide-shut brake state switches over to avoid having the fusion welding phenomenon that current density is too big and the temperature rise is too fast causes because of the contact point department, and then effectively improve contact subassembly, switch element and switching apparatus's security performance.

The embodiment of the utility model is realized like this:

the utility model discloses an aspect provides a contact subassembly, including moving contact and static contact, the moving contact is driven to rotate with the cooperation the static contact divide-shut brake works as the moving contact with the static contact is when the divide-shut brake state switches, the moving contact be used for with one side of static contact with the static contact be used for with one side of moving contact is parallel to each other or is basically parallel. The contact assembly can increase the contact area between the moving contact and the static contact when the moving contact and the static contact are switched on and off, thereby avoiding fusion welding phenomenon caused by the problems of overlarge current density and too fast temperature rise at the contact point, and further effectively improving the safety performance of the contact assembly, the switch unit and the switch electric appliance.

Optionally, one side of the fixed contact, which is used for being in contact with the movable contact, includes a first contact section and a second contact section connected to the first contact section, when the movable contact and the fixed contact are switched in an on-off state, one side of the movable contact, which is used for being in contact with the fixed contact, and the first contact section are parallel or substantially parallel to each other, and a distance between one side of the second contact section, which is close to the first contact section, and the movable contact is smaller than a distance between one side of the second contact section, which is far away from the first contact section, and the movable contact.

Optionally, the distance between the second contact segment and the movable contact is gradually increased from the side of the second contact segment close to the first contact segment to the side of the second contact segment far away from the first contact segment.

Optionally, one side of the second contact segment close to the movable contact is a plane or an arc surface, and the arc surface protrudes toward one side close to the movable contact.

Optionally, one side of the fixed contact, which is used for contacting with the movable contact, further includes a third contact section connected to the first contact section, the third contact section is located on one side of the first contact section, which is far away from the second contact section, and when the movable contact and the fixed contact are switched in an opening and closing state, a distance between one end of the third contact section, which is close to the first contact section, and the movable contact is smaller than a distance between one side of the third contact section, which is far away from the second contact section, and the movable contact.

Optionally, the moving contact includes a first contact piece and a second contact piece, the first contact piece and the second contact piece are stacked in an axial direction of the moving contact, and the moving contact is driven to rotate, so that the fixed contact is clamped between the first contact piece and the second contact piece.

Optionally, a first guide portion is disposed on one side of the first contact piece close to the second contact piece and/or one side of the second contact piece close to the first contact piece, and the first guide portion is configured to guide the static contact to extend into a space between the first contact piece and the second contact piece.

Optionally, a second guide portion is disposed on one side of the static contact close to the first contact piece and/or one side of the static contact close to the second contact piece, and the second guide portion is adapted to the first guide portion to cooperate with the first guide portion to guide the static contact extending between the first contact piece and the second contact piece.

The embodiment of the utility model provides a on the other hand provides a switch unit, including casing and foretell contact subassembly, contact subassembly's moving contact rotates to be installed in the casing, contact subassembly's static contact fixed mounting is in the casing. The contact assembly can increase the contact area between the moving contact and the static contact when the moving contact and the static contact are switched on and off, thereby avoiding fusion welding phenomenon caused by the problems of overlarge current density and too fast temperature rise at the contact point, and further effectively improving the safety performance of the contact assembly, the switch unit and the switch electric appliance.

The embodiment of the utility model provides a further aspect provides a switching device, including operating device and foretell switch unit, switch unit's quantity includes a plurality ofly, and is a plurality of switch unit stacks gradually the setting, operating device and every switch unit's moving contact drive is connected for it is a plurality of to drive switch unit's moving contact rotates in step. The contact assembly can increase the contact area between the moving contact and the static contact when the moving contact and the static contact are switched on and off, thereby avoiding fusion welding phenomenon caused by the problems of overlarge current density and too fast temperature rise at the contact point, and further effectively improving the safety performance of the contact assembly, the switch unit and the switch electric appliance.

The utility model discloses beneficial effect includes:

the contact assembly comprises a moving contact and a fixed contact, wherein the moving contact is driven to rotate to match with the fixed contact for switching on and off, when the moving contact and the fixed contact are switched in an on-off state, one side of the moving contact, which is used for being in contact with the fixed contact, and one side of the fixed contact, which is used for being in contact with the moving contact, are parallel or basically parallel, so that when the moving contact and the fixed contact are switched in the on-off state, the contact mode between the moving contact and the fixed contact is changed from point contact to surface contact, the contact area of a contact area between the moving contact and the fixed contact is increased, the fusion welding phenomenon caused by the problems of overlarge current density and too fast temperature rise at the contact point is avoided, and the safety performance of the contact assembly, the switch unit and the switching device is effectively improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and that those skilled in the art can also obtain other related drawings based on these drawings without inventive efforts.

Fig. 1 is a schematic structural diagram of a moving contact and a static contact in a switching-off state according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a moving contact and a static contact in a closing state according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of the moving contact and the static contact when switching between the opening and closing states provided by the embodiment of the present invention;

fig. 4 is a schematic structural view of a static contact according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a contact assembly according to an embodiment of the present invention;

fig. 6 is a second schematic structural view of a contact assembly according to an embodiment of the present invention;

fig. 7 is a third schematic structural view of a contact assembly according to an embodiment of the present invention;

fig. 8 is a schematic structural diagram of a switch unit according to an embodiment of the present invention;

fig. 9 is a schematic structural diagram of a switching device according to an embodiment of the present invention.

Icon: 100-a contact assembly; 10-moving contact; 11-a first contact pad; 12-a second contact pad; 13-a first guide; 20-a static contact; 21-a first contact segment; 22-a second contact segment; 23-a third contact segment; 24-a second guide; a-rotating the axial direction; b-the direction of rotation; c-a contact region; 200-a switching unit; 210-a housing; 300-switching on and off the electrical appliance; 310-operating mechanism.

Detailed Description

To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the attached drawings in the embodiments of the present invention are combined to clearly and completely describe the technical solution in the embodiments of the present invention, and obviously, the described embodiments are part of the embodiments of the present invention, rather than all embodiments. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without making creative efforts belong to the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined or explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the directions or positional relationships based on the directions or positional relationships shown in the drawings, or the directions or positional relationships that the products of the present invention are usually placed when used, and are only for the convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element indicated must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; either directly or indirectly through intervening media, or may be internal to both elements. The specific meaning of the above terms in the present invention can be understood as a specific case by those skilled in the art.

Referring to fig. 8 and 9 in combination, an embodiment of the present application provides a switching apparatus 300, which includes an operating mechanism 310 and a switching unit 200, so as to control the opening and closing operations of the switching unit 200 through the operating mechanism 310, thereby improving the accuracy and reliability of the opening and closing operations of the switching unit 200, for example, the switching apparatus 300 may be a rotary switch, a disconnecting switch, a circuit breaker, or the like. In an actual manufacturing process, the switch unit 200 may be fixedly disposed at one side of the operating mechanism 310, and the fixing manner between the operating mechanism 310 and the switch unit 200 may be a detachable connection or a non-detachable connection, for example, the detachable connection may be a screw connection, a snap connection, a splice connection, or the like.

When the number of the switch units 200 includes a plurality of switch units 200, the switch units 200 are sequentially stacked, and each switch unit 200 has an independent contact assembly 100 built therein, so that each switch unit 200 can be connected to one circuit and perform on-off control on the connected circuit. In the process of controlling the opening and closing operations of the switch units 200 through the operating mechanism 310, the operating mechanism 310 needs to be in driving connection with the movable contact 10 of each switch unit 200, so as to drive the movable contacts 10 of the switch units 200 to rotate synchronously through the operating mechanism 310, thereby achieving the consistency of the opening and closing states of the switch units 200, that is, under the control of the operating mechanism 310, all the switch units 200 are in the opening state at the same time, or all the switch units 200 are in the closing state at the same time. Regarding the actual number of the switch units 200, those skilled in the art should be able to make reasonable selection and design according to actual situations, as long as the switch units 200 can meet the actual requirements of the connected circuit, for example, the switch units 200 may be configured to be 4, 6, 8, 10 or 12, etc., and are not limited specifically herein.

The actual number of the contact assemblies 100 built in each switch unit 200 may be set to 1 group, 2 groups, 3 groups or multiple groups (each group of the contact assemblies 100 includes 1 moving contact 10 and 1 fixed contact 20), and the like, and according to the difference in the number of the groups, the corresponding connection may enable the connected circuit to form a single break point, a double break point, a triple break point or a multiple break point when the circuit is disconnected. Illustratively, as shown in fig. 8, in the present embodiment, each switch unit 200 includes a housing 210 and 2 sets of contact assemblies 100, wherein the movable contacts 10 of the 2 sets of contact assemblies 100 are integrated on the same movable contact 10 support, so that the movable contacts 10 are rotatably mounted in the housing 210, the fixed contacts 20 of the 2 sets of contact assemblies 100 are respectively and fixedly mounted on two opposite sides of the housing 210, so that one of the movable contacts 10 is matched with the fixed contact 20 located on one side of the housing 210, and the other movable contact 10 is matched with the fixed contact 20 located on the other side of the housing 210, thereby forming a double-breakpoint structure.

Specifically, as shown in fig. 1 to 7, the contact assembly 100 provided in the embodiment of the present application includes a movable contact 10 and a stationary contact 20, the movable contact 10 is driven to rotate to cooperate with the stationary contact 20 to open and close, and when the movable contact 10 and the stationary contact 20 are switched in an open and close state, a side of the movable contact 10 contacting the stationary contact 20 and a side of the stationary contact 20 contacting the movable contact 10 are parallel or substantially parallel to each other. The contact assembly 100 can increase the contact area between the moving contact 10 and the static contact 20 when the moving contact and the static contact are switched on and off, so that the fusion welding phenomenon caused by the problems of overlarge current density and too fast temperature rise at the contact point is avoided, and the safety performance of the contact assembly 100, the switch unit 200 and the switch electric appliance 300 is further effectively improved.

It should be noted that, as shown in fig. 1, the moving contact 10 rotates clockwise along the rotation direction b of the moving contact 10, the moving contact 10 moves to a position far away from the static contact 20 relative to the static contact 20 to implement opening in cooperation with the static contact 20, as shown in fig. 2, the moving contact 10 rotates counterclockwise along the rotation direction b of the moving contact 10 relative to the static contact 20 to move to a position close to the static contact 20 to implement closing in cooperation with the static contact 20, in the switching process of the opening and closing states of the moving contact 10 and the static contact 20, the contact assembly 100 further includes two critical states, one is that the moving contact 10 and the static contact 20 which are originally in the opening state are to implement closing, the other is that the moving contact 10 and the static contact 20 which are originally in the closing state are to implement opening, and the positional relationship between the moving contact 10 and the static contact 20 is shown in fig. 3.

In the existing product, because the contact surfaces of the moving contact and the static contact respectively protrude towards one side close to the other side, when the moving contact and the static contact are switched in an opening and closing state, the contact mode between the moving contact and the static contact is point contact, and the problem of overlarge current density at the contact point exists, so that the temperature at the contact point is increased too fast, a fusion welding phenomenon is very easy to occur, and the safety performance of the switching apparatus 300 is influenced.

In order to solve the problem, according to the contact assembly 100 provided by the application, when the movable contact 10 and the static contact 20 are switched in the on-off state, the side of the movable contact 10, which is in contact with the static contact 20, and the side of the static contact 20, which is in contact with the movable contact 10, are parallel or substantially parallel to each other, so that when the movable contact 10 and the static contact 20 are switched in the on-off state, the contact mode between the two is changed from "point contact" to "surface contact", so that the contact area of the contact area c between the two is increased, further, the fusion welding phenomenon caused by the problems of too high current density and too fast temperature rise at the contact point is avoided, and the safety performance of the contact assembly 100, the switch unit 200 and the switch electric appliance 300 is effectively improved.

It should be noted that, in an actual production process, a side of the movable contact 10 contacting the fixed contact 20 and a side of the fixed contact 20 contacting the movable contact 10 may be absolutely parallel or substantially parallel (or approximately parallel), and a contact area of a contact area c between the two sides may be increased, so as to solve the problems of excessive current density and excessive temperature rise of a contact point in the prior art.

As shown in fig. 4 and 5, in the present embodiment, a side of the fixed contact 20, which is used for being in contact with the movable contact 10, includes a first contact section 21 and a second contact section 22 connected to the first contact section 21, when the movable contact 10 and the fixed contact 20 are switched in an on-off state, a side of the movable contact 10, which is used for being in contact with the fixed contact 20, and the first contact section 21 are parallel or substantially parallel to each other, and a distance between a side of the second contact section 22, which is close to the first contact section 21, and the movable contact 10 is smaller than a distance between a side of the second contact section 22, which is far away from the first contact section 21, and the movable contact 10, so as to prevent an arc breaking between the movable contact 10 and the fixed contact 20 from occurring on the second contact section 22.

The longer the length of the first contact section 21 is, the larger the contact area between the movable contact 10 and the static contact 20 when the two are switched in the opening and closing states is, and regarding the actual length of the first contact section 21, a person skilled in the art should be able to reasonably select and design according to actual conditions, and no specific limitation is made here.

Further, as shown in fig. 4 to fig. 6, in this embodiment, a side of the static contact 20, which is used to contact the dynamic contact 10, further includes a third contact section 23 connected to the first contact section 21, and the third contact section 23 is located on a side of the first contact section 21, which is far away from the second contact section 22, in other words, a third contact section 23 is further disposed on a side of the first contact section 21, which is far away from the second contact section 22, and when the dynamic contact 10 and the static contact 20 are switched in an opening and closing state, a distance between one end of the third contact section 23, which is close to the first contact section 21, and the dynamic contact 10 is smaller than a distance between one side of the third contact section 23, which is far away from the second contact section 22, and the dynamic contact 10, so as to avoid a tip discharge phenomenon caused by an over-tip of the static contact 20.

As shown in fig. 5, in the present embodiment, the distance between the second contact segment 22 and the movable contact 10 gradually increases from the side of the second contact segment 22 close to the first contact segment 21 to the side of the second contact segment 22 away from the first contact segment 21. Optionally, a side of the second contact segment 22 close to the movable contact 10 is a plane or an arc. Optionally, the arc surface protrudes toward a side close to the movable contact 10, so as to avoid an arc reignition phenomenon occurring between the second contact section 22 and the movable contact 10 after the movable contact 10 and the static contact 20, which are originally in a closing state, have just implemented a switch-off operation.

As shown in fig. 6, in the present embodiment, the movable contact 10 includes a first contact piece 11 and a second contact piece 12, the first contact piece 11 and the second contact piece 12 are stacked along a rotation axis a of the movable contact 10, and the movable contact 10 is driven to rotate, so that the fixed contact 20 is clamped between the first contact piece 11 and the second contact piece 12, and the contact between the movable contact 10 and the fixed contact 20 is more stable and reliable.

In the existing product, since the distance between the first contact piece and the second contact piece of the moving contact is equal to the thickness of the static contact along the rotation axial direction a of the moving contact, when the moving contact and the static contact are switched in an on-off state, a bounce phenomenon easily occurs between the moving contact and the static contact, and the safety performance of the switching device 300 is affected.

As shown in fig. 6 and 7, in this embodiment, a first guide portion 13 is disposed on a side of the first contact piece 11 close to the second contact piece 12 and/or a side of the second contact piece 12 close to the first contact piece 11, the first guide portion 13 is used for guiding the static contact 20 to extend into a space between the first contact piece 11 and the second contact piece 12, and a distance between two first guide portions 13, or between the first guide portion 13 on the first contact piece 11 and the side of the second contact piece 12 close to the first contact piece 11, or between the side of the first contact piece 11 close to the second contact piece 12 and the first guide portion 13 on the second contact piece 12 is greater than a thickness of the static contact 20 along the rotation axial direction a of the moving contact 10, so that the static contact 20 can smoothly extend into a space between the first contact piece 11 and the second contact piece 12, thereby preventing a bouncing phenomenon from occurring between the moving contact 10 and the static contact 20 and affecting on-off control of the circuit accessed by the switch unit 200.

As shown in fig. 6 and 7, in the present embodiment, a second guiding portion 24 is disposed on a side of the fixed contact 20 close to the first contact piece 11 and/or a side of the fixed contact 20 close to the second contact piece 12, the second guiding portion 24 is adapted to the first guiding portion 13 to cooperate with the first guiding portion 13 to guide the fixed contact 20 extending between the first contact piece 11 and the second contact piece 12, and a distance between the two second guiding portions 24, a distance between the second guiding portion 24 disposed on a side of the fixed contact 20 close to the first contact piece 11 and a side of the fixed contact 20 close to the second contact piece 12, or a distance between a side of the fixed contact 20 close to the first contact piece 11 and the second guiding portion 24 disposed on a side of the fixed contact 20 close to the second contact piece 12 is smaller than a distance between (the first guiding portion 13 of) the first contact piece 11 and (the first guiding portion 13 of) the second contact piece 12, so that the fixed contact 20 can smoothly extend between the first guiding portion 11 and the second guiding portion 12 and the movable contact piece 20 are further prevented from generating a bouncing phenomenon, which affects on/off of a circuit connected to the switch unit 200.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The contact assembly (100) is characterized by comprising a movable contact (10) and a fixed contact (20), wherein the movable contact (10) is driven to rotate to match with the fixed contact (20) to be switched on and off, and when the movable contact (10) and the fixed contact (20) are switched on and off, one side of the movable contact (10) in contact with the fixed contact (20) and one side of the fixed contact (20) in contact with the movable contact (10) are parallel or substantially parallel.

2. The contact assembly (100) according to claim 1, wherein the side of the fixed contact (20) contacting the movable contact (10) comprises a first contact section (21) and a second contact section (22) connected to the first contact section (21), when the movable contact (10) and the fixed contact (20) are switched in an on-off state, the side of the movable contact (10) contacting the fixed contact (20) and the first contact section (21) are parallel or substantially parallel to each other, and a distance between a side of the second contact section (22) close to the first contact section (21) and the movable contact (10) is smaller than a distance between a side of the second contact section (22) far from the first contact section (21) and the movable contact (10).

3. The contact assembly (100) according to claim 2, wherein the spacing between the second contact segment (22) and the movable contact (10) increases progressively from the side of the second contact segment (22) closer to the first contact segment (21) to the side of the second contact segment (22) further from the first contact segment (21).

4. The contact assembly (100) according to claim 3, wherein a side of the second contact segment (22) close to the movable contact (10) is a plane or a cambered surface, said cambered surface being convex towards the side close to the movable contact (10).

5. The contact assembly (100) according to claim 2, wherein a side of the fixed contact (20) contacting the movable contact (10) further includes a third contact segment (23) connected to the first contact segment (21), the third contact segment (23) is located on a side of the first contact segment (21) away from the second contact segment (22), and when the movable contact (10) and the fixed contact (20) are switched in an opening/closing state, a distance between one end of the third contact segment (23) close to the first contact segment (21) and the movable contact (10) is smaller than a distance between a side of the third contact segment (23) away from the second contact segment (22) and the movable contact (10).

6. The contact assembly (100) of claim 1, wherein the movable contact (10) comprises a first contact piece (11) and a second contact piece (12), the first contact piece (11) and the second contact piece (12) are stacked along a rotation axis (a) of the movable contact (10), and the movable contact (10) is driven to rotate so as to clamp the fixed contact (20) between the first contact piece (11) and the second contact piece (12).

7. Contact assembly (100) according to claim 6, wherein a side of the first contact piece (11) close to the second contact piece (12) and/or a side of the second contact piece (12) close to the first contact piece (11) is provided with a first guide (13), the first guide (13) being adapted to guide the stationary contact (20) extending between the first contact piece (11) and the second contact piece (12).

8. The contact assembly (100) according to claim 7, wherein a side of the stationary contact (20) adjacent to the first contact piece (11) and/or a side of the stationary contact (20) adjacent to the second contact piece (12) is provided with a second guide portion (24), and the second guide portion (24) is adapted to the first guide portion (13) to cooperatively guide the stationary contact (20) extending between the first contact piece (11) and the second contact piece (12).

9. A switching unit (200) comprising a housing (210) and the contact assembly (100) of any one of claims 1 to 8, wherein the movable contact (10) of the contact assembly (100) is rotatably mounted in the housing (210), and the stationary contact (20) of the contact assembly (100) is fixedly mounted in the housing (210).

10. A switching device (300), comprising an operating mechanism (310) and the switching units (200) as claimed in claim 9, wherein the number of the switching units (200) includes a plurality, the plurality of switching units (200) are sequentially stacked, and the operating mechanism (310) is in driving connection with the movable contact (10) of each switching unit (200) for driving the movable contacts (10) of the plurality of switching units (200) to synchronously rotate.