A switching unit and a switching electric appliance

Abstract

The application relates to a switch unit and a switch appliance, and relates to the technical field of electric appliance switches. The switch unit comprises a unit shell, a moving contact rotatably arranged in the unit shell, and a static contact and a magnetic assembly fixedly arranged in the unit shell. The moving contact rotates relative to the unit shell to form an arc-shaped rotating path for cooperating with the static contact to open and close the switch. The magnetic assembly is located outside the arc-shaped rotating path. The magnetic assembly comprises a shell and a magnet fixedly arranged in the shell. A bent plate is arranged on the shell. An outer wall of the shell and an inner wall of the bent plate cooperate to form an airflow channel. The airflow channel is located on the arc-shaped rotating path. The airflow passing through the airflow channel is used for dispersing the arc between the moving contact and the static contact. The switch appliance comprises the above switch unit. The switch unit and the switch appliance can improve the arc extinguishing effect through the cooperation of the magnetic field and the airflow, thereby effectively improving the safety performance of the switch unit and the switch appliance.

Description

Technical Field

[0001] This invention relates to the field of electrical switch technology, and more specifically, to a switch unit and a switch appliance. Background Technology

[0002] Switchgear plays two roles in a power system: first, a control role, which involves putting a portion of the power equipment or lines into or out of operation according to the needs of the power system; and second, a protection role, which involves quickly disconnecting the faulty part from the power system when a fault occurs in the power equipment or line, ensuring the normal operation of the fault-free part of the power system.

[0003] In existing technologies, magnets are usually installed inside switching devices to extinguish arcs. Generally, the magnets are placed directly on the support of the moving contact or on the housing of the switching device. The magnetic field generated by the magnet acts on the arc, which has the problem of poor arc extinguishing effect, resulting in poor safety performance of the switching device. Summary of the Invention

[0004] The purpose of this invention is to provide a switching unit and switching device that can improve the arc extinguishing effect through the combined effect of magnetic field and airflow, thereby effectively improving the safety performance of the switching unit and switching device.

[0005] The embodiments of the present invention are implemented as follows:

[0006] In one aspect, this invention provides a switching unit, including a unit housing, a moving contact rotatably disposed within the unit housing, and a stationary contact and a magnetic assembly respectively fixedly disposed within the unit housing. The moving contact rotates relative to the unit housing to form an arc-shaped rotation path that cooperates with the stationary contact for opening and closing. The magnetic assembly is located outside the arc-shaped rotation path. The magnetic assembly includes a housing and a magnet fixedly disposed within the housing. A bending plate is disposed on the housing, and the outer wall of the housing and the inner wall of the bending plate cooperate to form an airflow channel. The airflow channel is located on the arc-shaped rotation path and is used to disperse the airflow of the electric arc between the moving contact and the stationary contact. This switching unit can improve the arc extinguishing effect through the combined effect of the magnetic field and airflow, thereby effectively improving the safety performance of the switching unit and the switching device.

[0007] Optionally, the number of bending plates includes two, and the two bending plates are arranged opposite to each other on both sides of the housing along the rotation axis of the moving contact. The two adjacent sides of the two bending plates cooperate to form a rotation channel for the moving contact to pass through.

[0008] Optionally, each of the bending plates includes a first plate body fixedly connected to the housing and a second plate body fixedly connected to the first plate body. The first plates of both bending plates extend toward a side closer to the rotation axis of the moving contact, and the second plates of both bending plates extend toward a side closer to each other.

[0009] Optionally, the magnet includes a first magnet and a second magnet, which are stacked in the housing along the rotation axis of the moving contact, and the magnetic poles of the first magnet near the second magnet are magnetically identical to the magnetic poles of the second magnet near the first magnet.

[0010] Optionally, the side of the magnet closest to the arc-shaped rotation path is an arc surface or a plane.

[0011] Optionally, the magnetic component is located on the side close to the stationary contact, which includes an extension extending into the airflow channel and located on the arcuate rotation path.

[0012] Optionally, a limiting part is provided inside the housing, which is used to limit the movement of the magnet when it is inserted into the housing.

[0013] Optionally, the magnetic component further includes a cover plate, the housing has an opening, the magnet passes through the opening and is received inside the housing, and the cover plate closes the housing to seal the opening.

[0014] Optionally, the housing is provided with a first snap-fit ​​portion, and the cover plate is provided with a second snap-fit ​​portion, the second snap-fit ​​portion engaging with the first snap-fit ​​portion to secure the cover plate to the housing.

[0015] Optionally, the housing is made of an insulating material.

[0016] In another aspect of this invention, a switching device is provided, including an operating mechanism and the aforementioned switching unit. The number of switching units is multiple, and the multiple switching units are stacked sequentially. The operating mechanism is driven and connected to the moving contact of each switching unit to drive the moving contacts of the multiple switching units to rotate synchronously. This switching unit can improve the arc-extinguishing effect through the combined effect of a magnetic field and airflow, thereby effectively improving the safety performance of the switching unit and the switching device.

[0017] The beneficial effects of the embodiments of the present invention include:

[0018] The switching unit includes a unit housing, a moving contact rotatably disposed within the unit housing, and a stationary contact and a magnetic component respectively fixedly disposed within the unit housing. The moving contact rotates relative to the unit housing to form an arc-shaped rotation path that cooperates with the stationary contact for opening and closing. The magnetic component is located outside the arc-shaped rotation path. The magnetic component includes a housing and a magnet fixedly disposed within the housing. The magnetic field generated by the magnet corresponds to the area where the electric arc is generated by the moving and stationary contacts, thereby allowing the magnetic field generated by the magnet to guide and stretch the electric arc to extinguish it. A bending plate is provided on the housing, and the outer wall of the housing and the inner wall of the bending plate cooperate to form an airflow channel. The airflow channel is located on the arc-shaped rotation path and is used to disperse the airflow of the electric arc between the moving and stationary contacts. The airflow, in conjunction with the magnetic field, further guides and stretches the electric arc to extinguish it more quickly. Compared with the prior art, which only uses the magnetic field generated by the magnet to act on the electric arc, the switching unit provided in this application can improve the arc extinguishing effect through the combined action of the magnetic field and airflow, thereby effectively improving the safety performance of the switching unit and the switching device. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, 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 the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is one of the structural schematic diagrams of the switching unit provided in the embodiments of the present invention;

[0021] Figure 2 This is a second schematic diagram of the structure of the switching unit provided in an embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of the structure of the moving contact and stationary contact in the open state provided in an embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of the structure of the moving contact and the stationary contact in the closed state provided in an embodiment of the present invention;

[0024] Figure 5 This is a schematic diagram of the structure of the moving contact and stationary contact when switching between opening and closing states, as provided in an embodiment of the present invention.

[0025] Figure 6 This is one of the structural schematic diagrams of the magnetic component provided in the embodiments of the present invention;

[0026] Figure 7 This is a second schematic diagram of the structure of the magnetic component provided in an embodiment of the present invention;

[0027] Figure 8 This is the third schematic diagram of the structure of the magnetic component provided in the embodiment of the present invention;

[0028] Figure 9 Fourth schematic diagram of the structure of the magnetic component provided in the embodiment of the present invention;

[0029] Figure 10 This is a schematic diagram of the structure of a switching device provided in an embodiment of the present invention.

[0030] Icons: 100-Switch unit; 10-Unit housing; 20-Moving contact; 30-Stationary contact; 40-Magnetic component; 41-Housing; 411-Limiting part; 412-First snap-fit ​​part; 42-Bending plate; 421-First plate; 422-Second plate; 431-First magnet; 432-Second magnet; 44-Cover plate; 441-Second snap-fit ​​part; a-Rotation axis; b-Arc-shaped rotation path; c-Airflow channel; d-Rotation channel; 200-Switch device; 210-Operating mechanism. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention 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 the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[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 invention, 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 invention is in use. They are only for the convenience of describing this invention 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 of this invention. In addition, the terms "first," "second," "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0035] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0036] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "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 a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0037] Please refer to the reference. Figures 1 to 10 This application provides a switching device 200, including an operating mechanism 210 and a switching unit 100, to control the opening and closing actions of the switching unit 100 through the operating mechanism 210, thereby improving the accuracy and reliability of the opening and closing actions of the switching unit 100. For example, the switching device 200 can be a rotary switch, a disconnecting switch, or a circuit breaker. In actual manufacturing, the switching unit 100 can be fixedly mounted on one side of the operating mechanism 210. The fixing method between the operating mechanism 210 and the switching unit 100 can be a detachable connection or a non-detachable connection. For example, a detachable connection can be a screw connection, a snap-fit ​​connection, or a splicing connection.

[0038] When there are multiple switching units 100, they are stacked sequentially. Each switching unit 100 has an independent contact assembly, enabling each switching unit 100 to connect to a circuit and control the on / off state of the connected circuit. During the control of the opening and closing actions of the switching units 100 via the operating mechanism 210, the operating mechanism 210 needs to be driven by the moving contact 20 of each switching unit 100. This allows the operating mechanism 210 to drive the moving contacts 20 of multiple switching units 100 to rotate synchronously, thereby achieving consistency in the opening and closing states of each switching unit 100. That is, under the control of the operating mechanism 210, all switching units 100 are simultaneously in the open state, or all switching units 100 are simultaneously in the closed state. Regarding the actual number of switch units 100, those skilled in the art should be able to make reasonable selections and designs based on the actual situation. As long as the switch units 100 can meet the actual needs of the connected circuit, it is sufficient. For example, the switch units 100 can be set to 4, 6, 8, 10 or 12, etc. There are no specific restrictions here.

[0039] Regarding the actual number of contact assemblies built into each switching unit 100, it can be set to 1 group, 2 groups, 3 groups, or more groups (each group of contact assemblies includes 1 moving contact 20 and 1 stationary contact 30), etc. Depending on the number of groups, the connected circuit can form a single break, double break, triple break, or multiple break points when disconnected. Those skilled in the art should be able to make reasonable selections and designs based on actual conditions, as long as the switching unit 100 can meet the actual needs of the connected circuit; no specific limitations are imposed here. For example, such as... Figures 1 to 5 As shown, in this embodiment, each switch unit 100 includes two sets of contact assemblies. The moving contacts 20 of the two sets of contact assemblies are integrated on the same moving contact 20 bracket. The stationary contacts 30 of the two sets of contact assemblies are respectively centrally symmetrically arranged on opposite sides of the unit housing 10, so that one moving contact 20 cooperates with the stationary contact 30 located on one side of the housing 41, and the other moving contact 20 cooperates with the stationary contact 30 located on the other side of the housing 41, thereby forming a double-break structure.

[0040] Specifically, such as Figures 1 to 9As shown, the switching unit 100 provided in this embodiment includes a unit housing 10, a moving contact 20 rotatably disposed within the unit housing 10, and a stationary contact 30 and a magnetic component 40 respectively fixedly disposed within the unit housing 10. The moving contact 20 rotates relative to the unit housing 10 to form an arc-shaped rotation path b that cooperates with the stationary contact 30 for opening and closing. The magnetic component 40 is located outside the arc-shaped rotation path b. The magnetic component 40 includes a housing 41 and a magnet fixedly disposed within the housing 41. A bending plate 42 is disposed on the housing 41. The outer wall of the housing 41 and the inner wall of the bending plate 42 cooperate to form an airflow channel c. The airflow channel c is located on the arc-shaped rotation path b and is used to disperse the airflow of the arc between the moving contact 20 and the stationary contact 30. This switching unit 100 can improve the arc extinguishing effect through the combined effect of the magnetic field and airflow, thereby effectively improving the safety performance of the switching unit 100 and the switching device 200.

[0041] It should be noted that, as Figures 3 to 5 As shown, when the moving contact 20 rotates relative to the unit housing 10 toward the side away from the stationary contact 30, it can cooperate with the stationary contact 30 to open the circuit. When the moving contact 20 rotates relative to the unit housing 10 toward the side closer to the stationary contact 30, it can cooperate with the stationary contact 30 to close the circuit. The stationary contact 30 needs to include a portion located on the arc-shaped rotation path b to realize the above-mentioned opening and closing process. During the opening and closing process of the moving contact 20 and the stationary contact 30, the moving contact 20 forms an arc-shaped rotation path b. The arc-shaped rotation path b formed by the moving contact 20 should include the arc-shaped rotation path b for opening and the arc-shaped rotation path b for closing. The two can be connected but not overlapped to correspond to the unidirectional rotation of the moving contact 20. They can also be completely overlapped to correspond to the bidirectional rotation (or reciprocating rotation) of the moving contact 20. Those skilled in the art should be able to make reasonable selections and designs according to the actual situation. As long as the switching unit 100 can meet the actual needs of the connected circuit, no specific restrictions are made here.

[0042] like Figures 3 to 5 As shown, the magnetic component 40 is located outside the arc-shaped rotation path b. In other words, the magnetic component 40 is located on the side of the arc-shaped rotation path b away from its rotation center. The magnetic component 40 includes a magnet, so that the magnetic field generated by the magnet corresponds to the region of the electric arc generated by the moving contact 20 and the stationary contact 30, thereby enabling the magnetic field generated by the magnet to guide and extinguish the electric arc. In addition, as... Figures 6 to 9As shown, the magnetic component 40 also includes a housing 41. On one hand, the housing 41 provides support for the magnet, facilitating its installation and fixation within the unit housing 10. On the other hand, a bending plate 42 is provided on the housing 41. The outer wall of the housing 41 and the inner wall of the bending plate 42 (i.e., the wall of the bending plate 42 facing the housing 41) cooperate to form an airflow channel c. The airflow channel c is located on the arc-shaped rotation path b, used to disperse the airflow of the arc between the moving contact 20 and the stationary contact 30, so that the airflow, in conjunction with the magnetic field, can further guide and stretch the arc to extinguish it more quickly. The housing 41 can be made of a non-magnetic material that can generate gas and is resistant to high temperatures. This allows the housing 41 to generate gas to extinguish the arc, prevents the housing 41 from burning out due to excessive temperature rise when the moving contact 20 and the stationary contact 30 are opening and closing, and avoids interference of the housing 41 material with the magnetic field generated by the magnet. In addition, the housing 41 can also be made of an insulating material to prevent the arc generated between the magnet and the moving contact 20 and the stationary contact 30 from making contact.

[0043] Regarding the correspondence between the actual number of contact assemblies and magnetic assemblies 40 built into each switching unit 100, as follows: Figures 1 to 5 As shown, in this embodiment, each switch unit 100 includes two sets of contact assemblies. The moving contacts 20 of the two sets of contact assemblies are integrated on the same moving contact 20 bracket. The stationary contacts 30 of the two sets of contact assemblies are respectively centrally symmetrically arranged on opposite sides of the unit housing 10, so that one moving contact 20 cooperates with the stationary contact 30 located on one side of the housing 41, and the other moving contact 20 cooperates with the stationary contact 30 located on the other side of the housing 41. At this time, the number of magnetic components 40 also includes two. The two magnetic components 40 respectively cooperate with the two sets of contact assemblies. In other words, the actual number of magnetic components 40 should be set in a one-to-one correspondence with the actual number of contact assemblies.

[0044] like Figures 6 to 9 As shown, in this embodiment, the number of bending plates 42 includes two. The two bending plates 42 are arranged opposite to each other on both sides of the housing 41 along the rotation axis a of the moving contact 20. The two adjacent sides of the two bending plates 42 cooperate to form a rotation channel d for the moving contact 20 to pass through. On the one hand, it can avoid the bending plates 42 from interfering with the opening and closing process of the moving contact 20 and the stationary contact 30. On the other hand, it can also ensure that the airflow can be gathered in the airflow channel c as much as possible, avoiding the flow to the gap between other components in the unit housing 10 or the gap between other components and the unit housing 10.

[0045] Specifically, such as Figures 6 to 9As shown, in this embodiment, each bending plate 42 includes a first plate 421 fixedly connected to the housing 41 and a second plate 422 fixedly connected to the first plate 421. The first plate 421 of the two bending plates 42 extends toward the side closer to the rotation axis a of the moving contact 20, and the second plate 422 of the two bending plates 42 extends toward the side closer to each other.

[0046] It should be noted that, since the housing 41 and the magnet of the magnetic component 40 are both located on the outside of the arc-shaped rotation path b, the first plate 421 of the two bent plates 42 both extend toward the side closer to the rotation axis a of the moving contact 20, so as to ensure that the airflow channel c formed by the housing 41 and the bent plate 42 can be located on the arc-shaped rotation path b. The second plate 422 of the two bent plates 42 both extend toward the side closer to each other, so as to ensure that the rotation channel d formed by the two bent plates 42 can not only enable the moving contact 20 and the stationary contact 30 to open and close smoothly, but also allow the airflow in the airflow channel c to flow out through the rotation channel d as little as possible.

[0047] In the direction from the housing 41 to the rotation center of the arc-shaped rotation path b, the width of the first plate 421 determines the width of the airflow channel c. In the rotation axis a of the moving contact 20, the distance between the two adjacent sides of the two second plates 422 determines the width of the rotation channel d. In the direction of the arc-shaped rotation path b, the lengths of the housing 41, the first plate 421, and the second plate 422 determine the lengths of the airflow channel c and the rotation channel d. Those skilled in the art should be able to make reasonable selections and designs based on the actual situation. As long as the switching unit 100 can meet the actual needs of the connected circuit, no specific restrictions are imposed here.

[0048] like Figure 7 As shown, in this embodiment, the magnet includes a first magnet 431 and a second magnet 432. The first magnet 431 and the second magnet 432 are stacked in the housing 41 along the rotation axis a of the moving contact 20. The magnetic poles of the first magnet 431 near the second magnet 432 are magnetically identical to the magnetic poles of the second magnet 432 near the first magnet 431, or in other words, the magnetic poles of the first magnet 431 near the second magnet 432 are repulsive to the magnetic poles of the second magnet 432 near the first magnet 431. The arrangement of the magnetic poles of the first magnet 431 and the second magnet 432 in the figure is for illustrative purposes only and does not constitute a limitation.

[0049] Optionally, the side of the magnet closest to the arc-shaped rotation path b is either curved or flat, and the sides of the housing 41 and the bent plate 42 closest to the arc-shaped rotation path b must match the side of the magnet closest to the arc-shaped rotation path b. When the side of the magnet closest to the arc-shaped rotation path b is curved, the magnetic field generated by the magnet can more comprehensively cover the area of ​​the arc generated by the moving contact 20 and the stationary contact 30, thereby accelerating the speed of arc extinguishing.

[0050] like Figures 1 to 5 As shown, in this embodiment, the magnetic component 40 is located on the side close to the stationary contact 30. The stationary contact 30 includes an extension that extends into the airflow channel c and is located on the arc-shaped rotation path b. In other words, the stationary contact 30 includes an extension that extends into the airflow channel c and is located on the arc-shaped rotation path b. The extension being located on the arc-shaped rotation path b ensures that the moving contact 20 and the stationary contact 30 can smoothly open and close. The extension extending into the airflow channel c allows the stationary contact 30 and the moving contact 20, when they are about to make contact with (or disengage from) the stationary contact 30, to be as close as possible to the magnetic component 40. This allows the electric arc generated by the moving contact 20 and the stationary contact 30 to smoothly enter the airflow channel c through the inlet of the airflow channel c (i.e., the end of the airflow channel c close to the stationary contact 30), thereby allowing the airflow to accurately act on the electric arc and accelerate its extinguishing. It is worth noting that the arrangement of the magnetic component 40 should also avoid interfering with the opening and closing process of the moving contact 20 and the stationary contact 30. For example, the side of the stationary contact 30 and the side of the moving contact 20 that is about to make contact with the stationary contact 30 (or about to break contact) can be as close as possible to the side of the airflow channel c that is close to the magnet.

[0051] like Figure 9 As shown, in this embodiment, a limiting part 411 is provided inside the housing 41. The limiting part 411 is used to limit the movement of the magnet inserted into the housing 41. The shape of the magnet needs to match the receiving cavity inside the housing 41 so that the operator can accurately assemble the magnet into the housing 41 under the action of the limiting part 411, thereby satisfying the magnetic requirements between the magnetic poles of the two magnets that are close to each other.

[0052] like Figure 7 and Figure 8 As shown, in this embodiment, the magnetic component 40 also includes a cover plate 44. The housing 41 has an opening, through which the magnet passes and is accommodated within the housing 41. The cover plate 44 covers the housing 41 to close the opening, so that the housing 41 and the cover plate 44 can cooperate to protect the magnet from damage.

[0053] like Figure 7As shown, in this embodiment, the housing 41 is provided with a first snap-fit ​​part 412, and the cover plate 44 is provided with a second snap-fit ​​part 441. The second snap-fit ​​part 441 engages with the first snap-fit ​​part 412 to make the cover plate 44 and the housing 41 snap-fit ​​and fix them together, so that the housing 41 and the cover plate 44 can be easily disassembled, which facilitates the disassembly, assembly and replacement of the magnet and the housing 41.

[0054] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A switching unit (100), characterized in that, The device includes a unit housing (10), a moving contact (20) rotatably disposed within the unit housing (10), and a stationary contact (30) and a magnetic assembly (40) respectively fixedly disposed within the unit housing (10). The moving contact (20) rotates relative to the unit housing (10) to form an arc-shaped rotation path (b) that cooperates with the stationary contact (30) for opening and closing. The magnetic assembly (40) is located outside the arc-shaped rotation path (b). The magnetic component (40) includes a housing (41) and a magnet fixedly disposed in the housing (41). A bending plate (42) is disposed on the housing (41). The outer wall of the housing (41) and the inner wall of the bending plate (42) cooperate to form an airflow channel (c). The airflow channel (c) is located on the arc-shaped rotation path (b) and is used to disperse the airflow of the electric arc between the moving contact (20) and the stationary contact (30). The number of the bending plates (42) includes two. The two bending plates (42) are arranged opposite to each other on both sides of the housing (41) along the rotation axis (a) of the moving contact (20). The two adjacent sides of the two bending plates (42) cooperate to form a rotation channel (d) for the moving contact (20) to pass through. Each of the bending plates (42) includes a first plate (421) fixedly connected to the housing (41) and a second plate (422) fixedly connected to the first plate (421). The first plates (421) of the two bending plates (42) extend toward the side closer to the rotation axis (a) of the moving contact (20), and the second plates (422) of the two bending plates (42) extend toward the side closer to each other.

2. The switching unit (100) according to claim 1, characterized in that, The magnet includes a first magnet (431) and a second magnet (432). The first magnet (431) and the second magnet (432) are stacked in the housing (41) along the rotation axis (a) of the moving contact (20), and the magnetic pole of the first magnet (431) near the second magnet (432) is magnetically identical to the magnetic pole of the second magnet (432) near the first magnet (431).

3. The switching unit (100) according to claim 1, characterized in that, The side of the magnet closest to the arcuate rotation path (b) is an arc surface or a plane.

4. The switching unit (100) according to claim 1, characterized in that, The magnetic component (40) is located on the side close to the stationary contact (30), which includes an extension extending into the airflow channel (c) and located on the arcuate rotation path (b).

5. The switching unit (100) according to claim 1, characterized in that, The housing (41) is provided with a limiting part (411), which is used to limit the movement of the magnet when it is inserted into the housing (41).

6. The switching unit (100) according to claim 1, characterized in that, The magnetic component (40) also includes a cover plate (44), the housing (41) has an opening, the magnet passes through the opening and is accommodated in the housing (41), and the cover plate (44) covers the housing (41) to close the opening.

7. The switching unit (100) according to claim 6, characterized in that, The housing (41) is provided with a first snap-fit ​​part (412), and the cover plate (44) is provided with a second snap-fit ​​part (441). The second snap-fit ​​part (441) engages with the first snap-fit ​​part (412) to make the cover plate (44) snap-fit ​​and fix it to the housing (41).

8. The switching unit (100) according to claim 7, characterized in that, The housing (41) is made of insulating material.

9. A switching device (200), characterized in that, The device includes an operating mechanism (210) and a switching unit (100) as described in any one of claims 1 to 8. The number of the switching units (100) includes a plurality of units, which are stacked sequentially. The operating mechanism (210) is driven to connect with the moving contact (20) of each of the switching units (100) to drive the moving contacts (20) of the plurality of switching units (100) to rotate synchronously.

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