Switch unit

Abstract

The invention provides a switch unit, and relates to the technical field of low-voltage apparatuses. The switch unit comprises a shell, a moving contact assembly, a static contact and an arc extinguishing mechanism, the moving contact assembly, the static contact and the arc extinguishing mechanism are arranged in the shell, the moving contact assembly comprises a moving contact, the arc extinguishing mechanism comprises an opening and closing assembly, the opening and closing assembly is located on the moving contact assembly and located on the side, facing the static contact, of the moving contact, and the opening and closing assembly comprises two opening and closing pieces which are opposite in the first direction, the first direction is perpendicular to the switching-on direction and a contact area of the moving contact, and the contact area is used for being in contact with the static contact to realize switching-on; when the opening and closing assembly is separated from the static contact, the two opening and closing pieces are attached to each other. After the opening and closing assembly is in contact with the static contact, the two opening and closing pieces are separated from each other and move to the two opposite sides of the static contact in the first direction. According to the switch unit, the insulation between the moving contact and the static contact can be realized by utilizing the closing of the two opening and closing pieces during opening, and the breaking performance of the switch unit can be greatly improved on the premise of ensuring low cost.

Description

Technical Field

[0001] This application relates to the field of low-voltage electrical technology, and more specifically, to a switching unit. Background Technology

[0002] As an essential electrical component in control circuits, disconnecting switches play a crucial role in power systems, providing both control and protection. They are widely used in numerous production processes and technical equipment. During the breaking process, an electric arc is generated between the moving and stationary contacts of a disconnecting switch. If this arc burns between the moving and stationary contacts for an extended period without being extinguished, it will cause breaking failure and extensive burn damage to the surfaces of the moving and stationary contacts, thus affecting the overall electrical life of the disconnecting switch.

[0003] To improve the breaking performance of disconnecting switches, existing technologies typically employ methods such as magnetic blow, air blow, and arc-extinguishing grids to guide arc movement or extinguish the arc. However, these methods all incur significant costs, directly impacting the overall price of the disconnecting switch. Summary of the Invention

[0004] The purpose of this application is to provide a switching unit that is low in cost and has high breaking performance, in order to address the shortcomings of the prior art.

[0005] To achieve the above objectives, the technical solutions adopted in the embodiments of this application are as follows:

[0006] This application provides a switching unit, including: a housing, a moving contact assembly, a stationary contact, and an arc-extinguishing mechanism disposed within the housing. The moving contact assembly includes a moving contact, and the arc-extinguishing mechanism includes an opening and closing assembly. The opening and closing assembly is located on the moving contact assembly and on the side of the moving contact facing the stationary contact. The opening and closing assembly includes two opening and closing members opposite each other along a first direction, wherein the first direction is perpendicular to the closing direction and the contact area of ​​the moving contact. The contact area is used to contact the stationary contact to achieve closing. When the opening and closing assembly separates from the stationary contact, the two opening and closing members are in contact with each other. After the opening and closing assembly contacts the stationary contact, the two opening and closing members separate from each other and move to opposite sides of the stationary contact in the first direction.

[0007] Optionally, the opening and closing assembly also includes a reset member, one end of which is connected to the housing and the other end of which is connected to the side of the opening and closing assembly facing the moving contact; when the circuit is closed, the reset member deforms to store energy.

[0008] Optionally, the opening and closing assembly also includes a fixing member disposed within the housing, with one end of the resetting member connected to the fixing member and the other end connected to the side of the opening and closing assembly facing the moving contact.

[0009] Optionally, the stationary contact has two opposing first inclined surfaces on the side facing the moving contact. The two first inclined surfaces on the side facing the moving contact are close to each other and on the side away from the moving contact are far apart from each other. The opening and closing member has a second inclined surface, and the two second inclined surfaces on the two opening and closing members are respectively used to cooperate with the two first inclined surfaces.

[0010] Optionally, the opening and closing component is provided with a permanent magnet, one pole of the permanent magnet being close to another opening and closing component in the opening and closing assembly, and the other pole of the permanent magnet being away from the other opening and closing component in the opening and closing assembly.

[0011] Optionally, the side of the opening and closing component is provided with a mounting groove, and the permanent magnet is inserted into the mounting groove from the groove opening along a second direction, wherein the second direction is perpendicular to the closing direction and the first direction respectively.

[0012] Optionally, the housing is provided with a first guide structure, and the opening and closing member is provided with a second guide structure that cooperates with the first guide structure. The first guide structure is used to guide the movement of the opening and closing member.

[0013] Optionally, one of the first guide structure and the second guide structure includes a guide rail, and the other includes a guide groove that cooperates with the guide rail. The guide rail is used to guide the movement of the opening and closing component when the opening and closing component separates from the stationary contact. The first guide structure also includes a first tilting platform, and the second guide structure also includes a second tilting platform that cooperates with the first tilting platform. The first tilting platform is used to guide the movement of the opening and closing component when the opening and closing component contacts the stationary contact.

[0014] Optionally, the moving contact assembly further includes a moving contact bracket, the moving contact being slidably mounted on the moving contact bracket, the sliding direction of the moving contact relative to the moving contact bracket being parallel to the closing direction, the housing being provided with a first opening limiting surface, and the opening / closing member being provided with a second opening limiting surface that can abut against the first opening limiting surface; when opening, after the second opening limiting surface abuts against the first opening limiting surface, the moving contact can continue to move a preset distance along the opening direction.

[0015] Optionally, the moving contact assembly also includes an insulating platform, which is located between the opening / closing member and the moving contact after the moving contact has moved a preset distance in the opening direction.

[0016] Optionally, the moving contact includes two sub-contacts opposite each other along a first direction, the contact areas of the two sub-contacts being close to each other, and the two sub-contacts being used to mate with the two sides of the stationary contact opposite each other in the first direction.

[0017] Optionally, the number of stationary contacts is even, half of the stationary contacts are spaced apart along the first direction to form a first stationary contact group, and the other half of the stationary contacts are also spaced apart along the first direction to form a second stationary contact group. The first stationary contact group and the second stationary contact group are spaced apart along the second direction, wherein the second direction is perpendicular to the closing direction and the first direction, respectively. The number of opening and closing components is equal to the number of stationary contacts and corresponds one-to-one with the stationary contacts.

[0018] Optionally, the reset element is a spring, which is in a stretched state when the circuit is closed.

[0019] The beneficial effects of this application include:

[0020] This application provides a switching unit, including: a housing, a moving contact assembly disposed within the housing, a stationary contact, and an arc-extinguishing mechanism. The moving contact assembly includes a moving contact, and the arc-extinguishing mechanism includes an opening / closing assembly. The opening / closing assembly is located on the moving contact assembly and on the side of the moving contact facing the stationary contact. The opening / closing assembly includes two opening / closing members opposite each other along a first direction, wherein the first direction is perpendicular to the closing direction and the contact area of ​​the moving contact. The contact area is used to contact the stationary contact to achieve closing. When the opening / closing assembly separates from the stationary contact, the two opening / closing members are in contact with each other. After the opening / closing assembly contacts the stationary contact, the two opening / closing members separate from each other and move to opposite sides of the stationary contact in the first direction. This switching unit has an opening / closing assembly on the moving contact assembly, and the opening / closing assembly moves with the moving contact. The opening / closing assembly includes two opening / closing members opposite each other along the first direction. When opening, the closing of the two opening / closing members can achieve insulation between the moving contact and the stationary contact, which can significantly improve the breaking performance of the switching unit while ensuring low cost. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of the switching unit provided in the embodiments of this application;

[0023] Figure 2 This is a schematic diagram of the switch unit with the housing removed, provided in an embodiment of this application.

[0024] Figure 3 This is one of the partial structural diagrams of the switching unit after the housing has been removed, provided in an embodiment of this application;

[0025] Figure 4This is the second partial structural diagram of the switching unit provided in the embodiments of this application, with the housing removed.

[0026] Figure 5 This is the third partial structural diagram of the switching unit provided in the embodiments of this application, with the housing removed.

[0027] Figure 6 A partial cross-sectional view of the switching unit provided in an embodiment of this application;

[0028] Figure 7 A partial structural schematic diagram of the switching unit provided in an embodiment of this application;

[0029] Figure 8 This is a schematic diagram of the structure of the stationary contact and arc-extinguishing assembly in the switching unit provided in the embodiments of this application.

[0030] Icons: 10-Switch unit; 11-Housing; 111-First housing; 112-Second housing; 113-Guide rail; 114-First tilting platform; 115-First opening limit surface; 12-Moving contact assembly; 121-Moving contact bracket; 122-Moving contact; 1221-Sub-contact; 123-Insulating platform; 13-Stationary contact; 131-First tilting surface; 14-Arc extinguishing mechanism; 141-Opening / closing component; 1411-Second tilting surface; 1412-Mounting groove; 1413-Guide groove; 1414-Second tilting platform; 1415-Second opening limit surface; 142-Reset component; 143-Fixing component; 1431-Extension arm; 144-Permanent magnet; F1-First direction; F2-Closing direction; F3-Second direction; F4-Opening direction. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. It should be noted that, unless otherwise specified, the various features in the embodiments of this application can be combined with each other, and the combined embodiments are still within the protection scope of this application.

[0033] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0034] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0035] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0036] During the breaking process of a disconnecting switch, an electric arc is generated between the moving and stationary contacts. If the arc burns between the moving and stationary contacts for an extended period without being extinguished, breaking will fail, and significant burn damage will occur on the surfaces of the moving and stationary contacts, affecting the overall electrical life of the disconnecting switch. To improve the breaking performance of disconnecting switches, existing technologies typically employ methods such as magnetic blow-out, air blow-out, and arc-extinguishing grids to guide the arc's movement or extinguish it. However, these methods all incur significant costs, directly impacting the overall price of the disconnecting switch.

[0037] To solve the above technical problems, please refer to Figure 1 and Figure 2 This application provides a switching unit 10, applied to a disconnecting switch, particularly a linear disconnecting switch. The switching unit 10 includes: a housing 11, a moving contact assembly 12, a stationary contact 13, and an arc-extinguishing mechanism 14 disposed within the housing 11. The moving contact assembly 12 includes a moving contact 122, and the arc-extinguishing mechanism 14 includes an opening and closing assembly. The opening and closing assembly is located on the moving contact assembly 12 and on the side of the moving contact 122 facing the stationary contact 13. The opening and closing assembly includes two opening and closing members 141 opposite each other along a first direction F1, wherein the first direction F1 is perpendicular to the closing direction F2 and the contact area of ​​the moving contact 122. The contact area is used to contact the stationary contact 13 to achieve closing. The contact area can be a line or a surface, etc.

[0038] When the opening and closing assembly separates from the stationary contact 13, the two opening and closing parts 141 are in contact with each other; after the opening and closing assembly contacts the stationary contact 13, the two opening and closing parts 141 separate from each other and move to opposite sides of the stationary contact 13 in the first direction F1.

[0039] The moving contact 122 moves along the closing direction F2 and contacts the stationary contact 13 to close the switching unit 10. The moving contact 122 moves along the opening direction F4, which is opposite to the closing direction F2, and separates from the stationary contact 13 to open the switching unit 10. During the opening and closing process, the arc-extinguishing mechanism 14 moves with the moving contact 122 to move closer to or further away from the stationary contact 13.

[0040] The arc-extinguishing mechanism 14 includes at least one set of opening and closing components, each set of components including two opening and closing members 141 arranged opposite each other along the first direction F1. During the closing process, the two opening and closing members 141 follow the moving contact 122 to approach the stationary contact 13. Before the opening and closing members 141 contact the stationary contact 13, the surfaces of the two opening and closing members 141 that are close to each other are in contact, thereby isolating the moving contact 122 from the stationary contact 13. After the opening and closing members 141 move to contact the stationary contact 13, the two opening and closing members 141 will be driven by the stationary contact 13 and / or other structures within the housing 11 to move away from each other, moving to opposite sides of the same stationary contact 13 in the first direction F1, thereby forming an opening between the two opening and closing members 141 to allow the moving contact 122 to contact the stationary contact 13 to achieve closing. During the opening process, the two opening and closing members 141 follow the moving contact 122 away from the stationary contact 13. After the opening and closing member 141 moves to separate from the stationary contact 13, the two opening and closing members 141 will approach each other and eventually fit together under the drive of the reset member 142 and / or other structures in the housing 11. The opening between them will close, isolating the moving contact 122 from the stationary contact 13, so that the moving contact 122 and the stationary contact 13 are completely insulated, thereby greatly improving the breaking performance of the switching unit 10.

[0041] The aforementioned switch unit 10 has an opening and closing assembly on the moving contact assembly 12, which moves with the moving contact 122. The opening and closing assembly includes two opening and closing parts 141 opposite each other along the first direction F1. When the circuit is opened, the closing of the two opening and closing parts 141 can achieve insulation between the moving contact 122 and the stationary contact 13, which can significantly improve the breaking performance of the switch unit 10 while ensuring low cost.

[0042] Optionally, the material of the opening / closing component 141 is a gas-generating material.

[0043] When the electric arc generated by the circuit breaker passes through the opening and closing component, the opening and closing component 141 quickly decomposes and releases a large amount of gas. This gas will rapidly expand and form a high-pressure area, repelling particles in the surrounding space and thus extinguishing the electric arc.

[0044] Alternatively, please refer to Figure 2 and Figure 3 The opening and closing assembly also includes a reset member 142, one end of which is connected to the housing 11 and the other end is connected to the side of the opening and closing assembly 141 facing the moving contact 122; when the circuit is closed, the reset member 142 deforms to store energy.

[0045] When closing, the opening / closing element 141 moves towards the stationary contact 13 following the moving contact 122, and the reset element 142 deforms to store energy. When opening, the reset element 142 restores its energy, and the opening / closing element 141 moves away from the stationary contact 13 under the pull of the reset element 142, accelerating the movement of the moving contact 122. In one opening / closing assembly, there are two opening / closing elements 141. Therefore, preferably, there are also two reset elements 142, which are used to reset the two opening / closing elements 141 respectively.

[0046] Optionally, the reset element 142 is a spring, which is in a stretched state when the circuit is closed. When the circuit is open, the opening / closing element 141 moves along the moving contact assembly 12 under the tension of the spring.

[0047] To facilitate the installation of the opening / closing component 141 and the resetting component 142, the opening / closing assembly may optionally include a fixing component 143, which is disposed inside the housing 11. One end of the resetting component 142 is connected to the fixing component 143, and the other end is connected to the side of the opening / closing component 141 facing the moving contact 122.

[0048] During installation, the fixing component 143, the opening / closing component 141, and the resetting component 142 can be connected to form a single assembly, which can then be installed into the housing 11. This effectively improves the installation efficiency and accuracy of the opening / closing component 141 and the resetting component 142.

[0049] Optionally, please refer to the following: Figure 4 and Figure 5 The stationary contact 13 has two opposing first inclined surfaces 131 on the side facing the moving contact 122. The two first inclined surfaces 131 are close to each other on the side facing the moving contact 122 and far away from each other on the side away from the moving contact 122. The opening and closing member 141 has a second inclined surface 1411. The two second inclined surfaces 1411 on the two opening and closing members 141 are respectively used to cooperate with the two first inclined surfaces 131.

[0050] When the circuit is closed, the two opening / closing elements 141 gradually approach the stationary contact 13. After the second inclined surface 1411 of the opening / closing element 141 contacts the first inclined surface 131 of the stationary contact 13, the opening / closing element 141 can slide along the first inclined surface 131 to move away from the other opening / closing element 141 opposite it. During this process, the opening between the two opening / closing elements 141 gradually increases until the opening / closing element 141 crosses the first inclined surface 131.

[0051] Alternatively, please refer to Figure 6 and Figure 7 The housing 11 is provided with a first guide structure, and the opening and closing member 141 is provided with a second guide structure that cooperates with the first guide structure. The first guide structure is used to guide the movement of the opening and closing member 141, so that the movement of the opening and closing member 141 is more precise.

[0052] Optionally, one of the first guide structure and the second guide structure includes a guide rail 113, and the other includes a guide groove 1413 that cooperates with the guide rail 113. The guide rail 113 is used to guide the opening and closing member 141 to move when the opening and closing component is separated from the stationary contact 13. The first guide structure also includes a first tilting platform 114, and the second guide structure also includes a second tilting platform 1414 that cooperates with the first tilting platform 114. The first tilting platform 114 is used to guide the opening and closing member 141 to move when the opening and closing component contacts the stationary contact 13.

[0053] During the closing process, the opening and closing assembly gradually approaches the stationary contact 13 following the moving contact 122. Before the opening and closing assembly contacts the stationary contact 13, the two opening and closing parts 141 of the assembly only move along the closing direction F2. At this time, the guide rail 113 and the guide groove 1413 cooperate to guide the movement of the opening and closing parts 141. It can be understood that the extension direction of the guide rail 113 and the guide groove 1413 is parallel to the closing direction F2.

[0054] After the opening and closing assembly contacts the stationary contact 13, the two opening and closing parts 141 of the opening and closing assembly move not only along the closing direction F2, but also along the first direction F1. The angle between the actual movement direction of the two opening and closing parts 141 and the closing direction F2 is an acute angle. At this time, the first tilting platform 114 and the second tilting platform 1414 cooperate with each other to guide the movement of the opening and closing parts 141.

[0055] Optionally, the fixing member 143 is provided with an extension arm 1431, which abuts against the side of the opening and closing member 141 away from the first guide structure to limit the opening and closing member 141.

[0056] Optionally, the moving contact 122 can abut against the opening / closing member 141 to push the opening / closing member 141 toward the stationary contact 13 when the circuit is closed.

[0057] Optionally, please refer to the following: Figure 8 The moving contact assembly 12 also includes a moving contact bracket 121. The moving contact 122 is slidably disposed on the moving contact bracket 121. The sliding direction of the moving contact 122 relative to the moving contact bracket 121 is parallel to the closing direction F2. The housing 11 is provided with a first opening limiting surface 115. The opening and closing member 141 is provided with a second opening limiting surface 1415 that can abut against the first opening limiting surface 115. When opening, after the second opening limiting surface 1415 abuts against the first opening limiting surface 115, the moving contact 122 can continue to move a preset distance along the opening direction F4.

[0058] When the circuit breaker is opened, after the second opening limit surface 1415 of the opening and closing member 141 abuts against the first opening limit surface 115 of the housing 11, the opening and closing member 141 stops moving. Then, the moving contact 122 moves a preset distance relative to the moving contact bracket 121 in the opening direction F4, thereby increasing the opening distance between the moving contact 122 and the stationary contact 13.

[0059] Optionally, the moving contact assembly 12 further includes an insulating platform 123. After the moving contact 122 moves a preset distance along the opening direction F4, the insulating platform 123 is located between the opening / closing member 141 and the moving contact 122. The insulating platform 123 is used to isolate the opening / closing member 141 and the moving contact 122.

[0060] It is understandable that when closing the circuit, if the moving contact 122 drives the opening / closing element 141 to move towards the stationary contact 13, then the moving contact 122 must first move relative to the moving contact support 121 in the closing direction F2, pass over the insulating platform 123, and then abut against the opening / closing element 141. After that, it continues to move in the closing direction F2 to drive the opening / closing element 141.

[0061] Alternatively, please refer to Figure 4 and Figure 6 The opening and closing component 141 is provided with a permanent magnet 144. One pole of the permanent magnet 144 is close to another opening and closing component 141 in the opening and closing assembly, and the other pole of the permanent magnet 144 is away from the other opening and closing component 141 in the opening and closing assembly.

[0062] Two opening / closing components 141 in a set of opening / closing assemblies are each equipped with a permanent magnet 144, which has opposing N and S poles. On one opening / closing component 141, one of the N and S poles of the permanent magnet 144 is positioned closer to the other opening / closing component 141, and the other is positioned away from it. The permanent magnets 144 on the two opening / closing components 141 form a magnetic field. When the moving contact 122 and the stationary contact 13 are disconnected, the electric arc generated in the contact area between the moving contact 122 and the stationary contact 13 is located within this magnetic field. During opening, the magnetic field guides the arc away from the stationary contact 13 and also disperses the arc, cooling and elongating it, thereby preventing the arc from continuously burning between the moving contact 122 and the stationary contact 13.

[0063] Optionally, the side of the opening / closing member 141 is provided with a mounting groove 1412, and the permanent magnet 144 is inserted into the mounting groove 1412 from the groove opening along the second direction F3, wherein the second direction F3 is perpendicular to the closing direction F2 and the first direction F1 respectively.

[0064] Alternatively, please refer to Figure 3 and Figure 4The moving contact 122 includes two sub-contacts 1221 facing each other along the first direction F1. The contact areas of the two sub-contacts 1221 are close to each other, and the two sub-contacts 1221 are respectively used to cooperate with the stationary contact 13 on opposite sides in the first direction F1. The two sub-contacts 1221 simultaneously contact the stationary contact 13 to close the circuit, which can improve the reliability of closing.

[0065] Optionally, the two sub-contacts 1221 correspond to the two opening and closing elements 141 respectively. When the circuit is closed, the two sub-contacts 1221 abut against the two opening and closing elements 141 respectively, so as to push the opening and closing elements 141 to move towards the stationary contact 13.

[0066] Optionally, please refer to the following: Figure 2 The number of stationary contacts 13 is even. Half of the stationary contacts 13 are distributed at intervals along the first direction F1 to form a first stationary contact group. The other half of the stationary contacts 13 are also distributed at intervals along the first direction F1 to form a second stationary contact group. The first stationary contact group and the second stationary contact group are distributed at intervals along the second direction F3, wherein the second direction F3 is perpendicular to the closing direction F2 and the first direction F1, respectively. The number of opening and closing components is equal to the number of stationary contacts 13 and corresponds one-to-one with the stationary contacts 13.

[0067] Each stationary contact 13 corresponds to a set of opening and closing components, and each set of opening and closing components includes two opening and closing parts 141. When closing, the two opening and closing parts 141 open to allow the moving contact 122 to contact the stationary contact 13; when opening, the two opening and closing parts 141 close to isolate the moving contact 122 from the stationary contact 13.

[0068] Alternatively, please refer to Figure 1 and Figure 2 The housing 11 includes a first housing 111 and a second housing 112. The first housing 111 and the second housing 112 are interlocked to form an accommodating space. The moving contact assembly 12, the stationary contact 13 and the arc extinguishing mechanism 14 are all located within the accommodating space.

[0069] Setting the housing 11 into two separable parts makes it easier to install the moving contact assembly 12, the stationary contact 13 and the arc extinguishing mechanism 14, as well as to process the features inside the housing 11.

[0070] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A switching unit, characterized in that, include: The housing (11), the moving contact assembly (12), the stationary contact (13), and the arc extinguishing mechanism (14) disposed within the housing (11) are described. The moving contact assembly (12) includes a moving contact (122), and the arc extinguishing mechanism (14) includes an opening and closing assembly. The opening and closing assembly is located on the moving contact assembly (12) and on the side of the moving contact (122) facing the stationary contact (13). The opening and closing assembly includes two opening and closing members (141) opposite each other along a first direction (F1). The first direction (F1) is perpendicular to the closing direction (F2) and the contact area of ​​the moving contact (122). The contact area is used to contact the stationary contact (13) to achieve closing. When the opening and closing assembly separates from the stationary contact (13), the two opening and closing parts (141) are in contact with each other; after the opening and closing assembly contacts the stationary contact (13), the two opening and closing parts (141) separate from each other and move to opposite sides of the stationary contact (13) in the first direction (F1).

2. The switching unit as described in claim 1, characterized in that, The opening and closing assembly also includes a reset member (142), one end of which is connected to the housing (11) and the other end is connected to the side of the opening and closing assembly (141) facing the moving contact (122); when the circuit is closed, the reset member (142) deforms to store energy.

3. The switching unit as described in claim 2, characterized in that, The opening and closing assembly also includes a fixing member (143), which is disposed inside the housing (11). One end of the resetting member (142) is connected to the fixing member (143), and the other end is connected to the side of the opening and closing member (141) facing the moving contact (122).

4. The switching unit as described in claim 1, characterized in that, The stationary contact (13) has two opposing first inclined surfaces (131) on the side facing the moving contact (122). The two first inclined surfaces (131) are close to each other on the side facing the moving contact (122) and far apart from each other on the side away from the moving contact (122). The opening and closing member (141) has a second inclined surface (1411). The two second inclined surfaces (1411) on the two opening and closing members (141) are respectively used to cooperate with the two first inclined surfaces (131).

5. The switching unit as described in claim 1, characterized in that, The opening / closing member (141) is provided with a permanent magnet (144), one pole of the permanent magnet (144) is close to the other opening / closing member (141) in the opening / closing assembly, and the other pole of the permanent magnet (144) is away from the other opening / closing member (141) in the opening / closing assembly.

6. The switching unit as described in claim 5, characterized in that, The opening and closing component (141) has a mounting groove (1412) on its side. The permanent magnet (144) is inserted into the mounting groove (1412) from the opening of the mounting groove (1412) along the second direction (F3), wherein the second direction (F3) is perpendicular to the closing direction (F2) and the first direction (F1) respectively.

7. The switching unit as claimed in claim 1, characterized in that, The housing (11) is provided with a first guide structure, and the opening and closing member (141) is provided with a second guide structure that cooperates with the first guide structure. The first guide structure is used to guide the movement of the opening and closing member.

8. The switching unit as described in claim 7, characterized in that, One of the first guide structure and the second guide structure includes a guide rail (113) and the other includes a guide groove (1413) that cooperates with the guide rail (113). The guide rail (113) is used to guide the opening and closing member (141) to move when the opening and closing component is separated from the stationary contact (13). The first guide structure further includes a first tilting platform (114), and the second guide structure further includes a second tilting platform (1414) that cooperates with the first tilting platform (114). The first tilting platform (114) is used to guide the opening and closing member (141) to move when the opening and closing component contacts the stationary contact (13).

9. The switching unit as claimed in claim 1, characterized in that, The moving contact assembly (12) further includes a moving contact bracket (121), and the moving contact (122) is slidably disposed on the moving contact bracket (121). The sliding direction of the moving contact (122) relative to the moving contact bracket (121) is parallel to the closing direction (F2). The housing (11) is provided with a first opening limiting surface (115), and the opening and closing member (141) is provided with a second opening limiting surface (1415) that can abut against the first opening limiting surface (115). When opening, after the second opening limiting surface (1415) abuts against the first opening limiting surface (115), the moving contact (122) can continue to move a preset distance along the opening direction (F4).

10. The switching unit as claimed in claim 9, characterized in that, The moving contact assembly (12) also includes an insulating platform (123). After the moving contact (122) moves a preset distance along the opening direction (F4), the insulating platform (123) is located between the opening / closing member (141) and the moving contact (122).

11. The switching unit as claimed in claim 1, characterized in that, The moving contact (122) includes two sub-contacts (1221) that are opposite each other along the first direction (F1). The contact areas of the two sub-contacts (1221) are close to each other. The two sub-contacts (1221) are respectively used to cooperate with the two sides of the stationary contact (13) that are opposite each other in the first direction (F1).

12. The switching unit as claimed in claim 1, characterized in that, The number of stationary contacts (13) is an even number. Half of the stationary contacts (13) are spaced apart along the first direction to form a first stationary contact group. The other half of the stationary contacts (13) are also spaced apart along the first direction to form a second stationary contact group. The first stationary contact group and the second stationary contact group are spaced apart along a second direction, wherein the second direction (F3) is perpendicular to the closing direction (F2) and the first direction (F1), respectively. The number of opening and closing components is equal to the number of stationary contacts (13) and corresponds one-to-one with each stationary contact (13).

13. The switching unit as claimed in claim 2, characterized in that, The reset element (142) is a spring, which is in a stretched state when the circuit is closed.

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