CN114649160A - Switch unit and rotary switch - Google Patents

Abstract

The invention discloses a switch unit and a rotary switch, and relates to the technical field of electrical equipment. The first static contact comprises a shell and at least one first static contact arranged in the shell, the first static contact comprises a contact part and a wiring part which are connected with each other, an arc spraying port is arranged on at least one side face of the shell, and the wiring part and the arc spraying port are respectively positioned on adjacent side walls of the shell. The occupied space can be reduced under the same breaking performance, and the safety in use is improved.

Description

Switch unit and rotary switch

Technical Field

The invention relates to the technical field of electrical equipment, in particular to a switch unit and a rotary switch.

Background

The words switch are to be interpreted as open and closed. It refers to an element that can open a circuit, interrupt a current, or cause it to flow to other circuits. The most common switches are electromechanical devices that are operated by a person, in which there are one or several contacts. The "closed" of a contact indicates that the contact is conductive, allowing current to flow; an "open" of the switch indicates that the contact is not conductive, creating an open circuit, and not allowing current to flow. The development history of the switch is from an original knife switch which needs manual operation to the current intelligent switch applied to various large-scale electrical control equipment, the functions of the switch are more and more, and the safety is higher and more.

With the development of technology, especially in photovoltaic systems, the power of inverters is getting larger and larger with the trend of "flat-grid" becoming more and more prominent, which brings about greater performance for rotary switches used on a large scale in inverters.

In the prior art, more and more use scenes need that the rotary switch can break a current with higher power and has smaller occupied space, when the power of the current is higher, a larger electric arc can be generated during breaking, the electric arc is sprayed out of a shell of the rotary switch and then contacts with a lead to cause short circuit, and equipment damage and even personnel life safety are threatened.

Disclosure of Invention

The invention aims to provide a switch unit and a rotary switch, which can reduce the occupied space and improve the safety in use under the same breaking performance.

The embodiment of the invention is realized by the following steps:

in one aspect of the embodiments of the present application, a switch unit is provided, including a housing and at least one first static contact disposed in the housing, where the first static contact includes a contact portion and a wiring portion that are connected to each other, an arc spraying port is disposed on at least one side surface of the housing, and the wiring portion and the arc spraying port are respectively located on different side surfaces of the housing.

Optionally, the first stationary contact further includes a connecting portion, the wiring portion extends to the outside of the housing through the connecting portion, and the wiring portion extends toward the center of the side surface of the housing.

Optionally, a fastener is provided on the wire connecting portion so that a wire is connected to the wire connecting portion through the fastener.

Optionally, a first baffle is disposed on a side of the housing where the fastening member is disposed, and a plane where the first baffle is disposed is perpendicular to a stacking direction of the housing.

Optionally, the first baffle of the adjacent switch unit and the side edge enclose a U-shaped space, and the wire can be disposed in the U-shaped space.

Optionally, a spacing between the first baffles of adjacent housings is greater than or equal to a width of the fastener.

Optionally, a second baffle is further disposed on the housing, and a plane where the second baffle is located is parallel to the stacking direction of the housing.

Optionally, the fixed contact is diagonally arranged in the switch unit, and the second baffle is located on one side of the casing close to the arc spraying opening of the adjacent switch unit.

Optionally, a bayonet and a protrusion are oppositely arranged on the housing, and adjacent housings are connected through the bayonet and the protrusion.

Optionally, the switch unit further includes a second stationary contact, where the second stationary contact includes a contact body and a welding pin connected to each other, and the welding pin is used for being welded to the circuit board.

The switch unit further comprises an auxiliary pin, one end of the auxiliary pin is connected with the first fixed contact or the second fixed contact, the other end of the auxiliary pin is welded with the circuit board, and a U-shaped groove for accommodating the auxiliary pin is correspondingly formed in the shell.

In another aspect of the embodiments of the present application, there is provided a rotary switch, including the switch unit as described in any one of the above, the switch units are stacked by a housing, and a plane of a wiring portion of each switch unit is parallel to a side face of the rotary switch.

The embodiment of the invention has the beneficial effects that:

according to the switch unit and the rotary switch provided by the embodiment of the application, the at least one first fixed contact arranged in the shell comprises the contact part and the wiring part which are connected with each other, and when the switch unit needs to be closed, the movable contact can be rotated to enable the movable contact to be communicated with the contact part of the first fixed contact, so that the electric connection is conducted. When the moving contact is separated from the first fixed contact, an arc is generated. The generated electric arc can be sprayed out from the arc spraying port, so that a quick arc extinguishing effect is realized. Wiring portion and spout the different side departments that the arc mouth is located the casing respectively, so, guaranteeing wiring portion and the safe distance who spouts the arc mouth, under the condition of preventing the short circuit, when wiring portion with spout the arc mouth and be located switch element's different side, need not to increase switch element's thickness in order to increase safe distance, can reduce occupation space under the same breaking performance to security when promoting the use.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in 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 for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural diagram of a switch unit according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a first fixed contact according to an embodiment of the present invention;

fig. 3 is a second schematic structural diagram of a first fixed contact according to an embodiment of the present invention;

fig. 4 is a second schematic structural diagram of a switch unit according to an embodiment of the present invention;

fig. 5 is a third schematic structural diagram of a switch unit according to an embodiment of the present invention;

fig. 6 is a fourth schematic structural diagram of a switch unit according to an embodiment of the present invention;

fig. 7 is a fifth schematic structural diagram of a switch unit according to an embodiment of the present invention;

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

fig. 9 is a schematic structural diagram of a rotary switch according to an embodiment of the present invention;

fig. 10 is a second schematic structural diagram of a rotary switch according to an embodiment of the present invention.

Icon: 100-a switching unit; 105-a wire; 110-a housing; a 111-U-shaped groove; 112-arc spraying port; 113-arcing space; 114-a first baffle; 115-a permanent magnet; 116-a second baffle; 117-boss; 118-bayonet; 119-projections; 120-a first stationary contact; 122-a contact; 124-a connecting part; 126-a wiring portion; 130-a fastener; 200-rotary switch.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. The components of embodiments of the present invention 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 figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection 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 and explained in subsequent figures. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art.

Referring to fig. 1 and fig. 2, the present embodiment provides a switch unit 100, including a housing 110, and at least one first stationary contact 120 disposed in the housing 110, where the first stationary contact 120 includes a contact portion 122 and a wiring portion 126 connected to each other, at least one side surface of the housing 110 is provided with an arc spraying opening 112, and the wiring portion 126 and the arc spraying opening 112 are respectively located on different side surfaces of the housing 110.

Specifically, as shown in fig. 2, the contact portion 122 of the first fixed contact 120 is located inside the housing 110, and when the movable contact inside the housing 110 rotates, the movable contact can be connected to the contact portion 122 of the first fixed contact 120 to form an electrical connection relationship, and is connected to a wire through the wiring portion 126. It can be understood that, by disposing the wiring portion 126 and the arc spraying opening 112 on different side surfaces of the housing 110, a distance between the wiring portion 126 and the arc spraying opening 112 can be increased, so that when the moving contact and the first stationary contact 120 are separated to generate charged particles, the charged particles are prevented from being sprayed onto the wiring portion 126 through the arc spraying opening 112, so as to short-circuit the first stationary contact 120, which is beneficial to improving stability of electrical connection. For example, the wire connection portion 126 and the arc spraying port 112 may be respectively disposed at adjacent lateral sides of the housing 110, or may be disposed at non-adjacent lateral sides.

In the switch unit 100 provided in the embodiment of the present application, through the at least one first fixed contact 120 disposed in the housing 110, the first fixed contact 120 includes the contact portion 122 and the wiring portion 126 that are connected to each other, when the switch unit 100 needs to be closed, the movable contact may be rotated to communicate the movable contact with the contact portion 122 of the first fixed contact 120, so as to implement conduction of electrical connection. When the movable contact is separated from the first stationary contact 120, an arc is generated. The generated arc can be ejected from the arc ejection opening 112, thereby achieving a rapid arc extinguishing effect. Wiring portion 126 and spout the different sides that the arc mouth 112 is located casing 110 respectively, so, guarantee wiring portion 126 and spout the safe distance of arc mouth 112, prevent to take place under the condition of short circuit, when wiring portion 126 and spout the different sides that the arc mouth 112 is located switch unit 100, need not to increase switch unit 100's thickness in order to increase safe distance, can be under the same breaking performance, reduce occupation space, and promote the security when using.

As shown in fig. 1 and 3, the first fixed contact 120 further includes a connecting portion 124, the wire connecting portion 126 extends to the outside of the housing 110 through the connecting portion 124, and the wire connecting portion 126 extends toward the center of the side of the housing 110.

Specifically, the connecting portion 124 is a bridge connecting the contact portion 122 and the wiring portion 126, and plays a role of connecting and supporting, and the connecting portion 124 passes through the sidewall of the housing 110 from the inner side of the housing 110 and extends to the outer side of the housing 110, so as to facilitate connection between a conductive wire and the wiring portion 126 of the first stationary contact 120. Referring to fig. 1, which is a dotted line, the dotted line in fig. 1 indicates a central position of a side of the housing 110, and the wire connecting portion 126 is extended in a direction indicated by an arrow in fig. 1, so that the wire connecting portion 126 is located close to the central position of the side of the housing 110. In this way, a greater distance can be provided between the wiring position and the arc spraying opening 112, so that the safety of the electrical connection is ensured.

As shown in fig. 4, a fastening member 130 is provided on the wire connecting portion 126 so that the wire 105 is connected to the wire connecting portion 126 by the fastening member 130.

Specifically, the fastening member 130 serves to fix the connection of the wire 105 and the wiring portion 126 to form a stable electrical connection path. Wherein the fastener 130 may be in the form of a screw and square pad to ensure stable contact of the connecting portion 124.

As shown in fig. 4, the switch unit 100 further includes a permanent magnet 115 disposed in the housing 110, and when the moving contact and the stationary contact are disconnected, an arc extinguishing area is formed, and the permanent magnet 115 corresponds to the arc extinguishing area.

By adopting the above form, under the action of the magnetic blowing force, the arc is stretched along the direction of the magnetic blowing force, and when the included angle between the straight line of the magnetic blowing force received by the arc and the orthographic projection of the straight line on the motion plane of the movable contact is more than or equal to 45 degrees and less than or equal to 135 degrees, the arc stretching space is larger, thereby being beneficial to accelerating the extinguishing speed of the arc. And the arc extinguishing device can be prevented from being blocked by other parts in the shell, and is favorable for improving the arc extinguishing effect.

Referring to fig. 4 again, an arc space 113 communicated with the arc spraying port 112 is correspondingly arranged in the housing 110; a boss 117 is further disposed in the shell 110, and the boss 117 is located in the arcing space 113, so that the arcing space 113 forms a passage which becomes larger from larger to smaller.

Specifically, in the above form, during the arc extinguishing process, a channel that is gradually decreased and then increased is formed in the arc space 113, and by using the laval nozzle principle, the arc speed is changed due to the change of the cross section (as shown in the arrow direction in fig. 4), the cross section of the front end of the narrow portion is gradually decreased, the flow speed is gradually increased, at this time, the arc flow speed exceeds the sound speed, the rear end of the narrow portion is gradually increased after opening, the transonic fluid no longer follows the flow speed at the small position of the cross section, the flow speed at the large position of the cross section is small, but is just opposite, the flow speed is larger as the cross section is larger, so the arc flow speed is wholly accelerated, the arc is ejected out of the arc space 113 as soon as possible, the arc is extinguished, and the stability of the switch unit 100 during use is improved.

As shown in fig. 5, a first baffle 114 is disposed on one side of the housing 110 where the fastening member 130 is disposed, and a plane of the first baffle 114 is perpendicular to a stacking direction of the housing 110.

Specifically, the plane of the first baffle 114 is perpendicular to the stacking direction of the housing 110, and the perpendicular direction is not an absolute perpendicular direction, and may have a certain inclination. The side that sets up fastener 130 on casing 110 sets up first baffle 114 and mainly plays the effect of protection to fastener 130 and wiring portion 126, can also lead and restrict wire inlet wire direction, and two side inlet wires are compared to homonymy inlet wire, can reduce 50% whole working volume, improve switch board space utilization. With the above configuration, the wire connecting portion 126 can be prevented from being collided with during use, and the wire connecting portion 126 between the adjacent housings 110 can be spaced from the fastening member 130, so that the electrical gap and the creepage distance can be increased. Meanwhile, the arc spraying openings 112 of the adjacent shells 110 can be isolated, so that the stability of electric connection in use can be improved.

In an alternative embodiment of the present application, the length of the first baffle 114 is less than or equal to the width of the housing 110. When the length of the first blocking plate 114 is smaller than the width of the housing 110, it mainly blocks the region where the wire connecting portion 126 and the fastening member 130 are engaged. When the length of the first blocking plate 114 is equal to the width of the housing 110, the first blocking plate not only blocks the area where the wiring portion 126 and the fastening member 130 are matched, but also blocks other areas, so that when a gap exists between adjacent housings 110, charged particles can be prevented from being ejected from the gap, a short circuit is formed between the charged particles and the wiring portion 126 and the fastening member 130, and the safety of the switch unit 100 during use is improved.

As shown in fig. 5, the first baffles 114 of the adjacent switch units and the side edges form a U-shaped space, and the wires can be disposed in the U-shaped space. Wherein the wire connecting portion 126 and the fastening member 130 are located in the U-shaped space to increase the electrical gap and creepage distance of the wire connecting portion 126 at the adjacent housing 110.

With continued reference to fig. 5, the spacing between the first baffles 114 of adjacent housings 110 is greater than or equal to the width of the fasteners 130.

Specifically, when fastener 130 adopted screw and square tile pad complex form, when fastening through the screw, can play spacing effect to the square tile pad through first baffle 114, prevent that the tile pad from following the commentaries on classics, be favorable to better compressing tightly wire 105, be favorable to promoting the stability of electricity connection. The distance between the first blocking plates 114 of the adjacent housings 110 may be slightly larger than the width of the fastening member 130, as long as the fastening member 130 can be limited to a certain extent. In addition, the distance between the first baffles 114 of the adjacent shells 110 may also be equal to the width of the fastening member 130, so that the fastening member 130 is clamped between the first baffles 114 of the adjacent shells 110 to better limit the fastening member 130.

As shown in fig. 6, the casing 110 is further provided with a second baffle 116, and a plane of the second baffle 116 is parallel to the stacking direction of the casing 110 (the direction indicated by the arrow in fig. 6).

Specifically, the second blocking plate 116 may be disposed on the side where the fastening member 130 is disposed, and since the adjacent side walls of the housing 110 of the single switch unit 100 are respectively provided with the arc spraying opening 112 and the wiring portion 126, and the fastening member 130 cooperating with the wiring portion 126, in order to further improve the insulation, the second blocking plate 116 is disposed on the side where the fastening member 130 is disposed on the housing 110, so as to serve as a barrier for the wiring position.

It should be noted that the second baffle 116 is mainly used to cooperate with the first baffle 114 to better perform the function of enclosure isolation. Therefore, the plane of the second baffle 116 is parallel to the stacking direction of the housing 110, and can be perpendicular to the plane of the first baffle 114, so that the matching form between the first baffle 114 and the second baffle 116 can be better matched according to the appearance of the housing 110, which is beneficial to improving the utilization rate of space and playing a better barrier role.

When the arrangement of fig. 6 is adopted, when connecting the wires 105, a single-side routing manner may be adopted, so that the wires 105 extend out along the U-shaped space. So that a desired connection path is formed between the switching unit 100 and the load.

As shown in fig. 1 and 7, the first fixed contact 120 is diagonally disposed in the switch unit 100, and the second baffle 116 is located at a side of the housing 110 close to the first fixed contact 120.

Specifically, when the first fixed contact 120 is diagonally arranged in the switch unit 100, the arrangement form of the first fixed contact 120 is not particularly limited in the embodiment of the present application, and the first fixed contact can be flexibly arranged according to actual needs. For example, the two first fixed contacts 120 may be arranged in the same manner, and both of them are connected to the wire connecting portion 126 through the conductive wire 105.

Optionally, the switch unit further includes a second stationary contact, and the second stationary contact includes a contact body and a welding pin connected to each other, and the welding pin is used for being welded to the circuit board. The first fixed contact 120 is fixedly connected with the circuit board through the connecting pin, the number of manual contacts in a conventional connecting mode can be reduced, the connection of the contacts can be reduced, and the connecting mode is simplified, so that the workload of wiring personnel is reduced, the diversity of the wiring mode is improved, and the applicability of the switch unit 100 is improved.

In addition, the housing 110 has an accommodating cavity for accommodating the movable contact, and when the movable contact is disconnected from the contact portion 122 of the first stationary contact 120, the generated arc can be ejected from the arc ejection opening 112 formed in the housing 110 along the arc ejection channel in the housing 110. After the generated arc (charged particles) is ejected from the arc ejection opening 112, in order to prevent the charged particles from forming a short circuit with the first stationary contact 120, the second baffle 116 is located at a side of the housing 110 close to the first stationary contact 120, so as to isolate the charged particles. At this time, the two-sided routing shown in fig. 7 may be adopted, so that the wires 105 extend out along the U-shaped space. So that a desired connection path is formed between the switching unit 100 and the load.

As shown in fig. 8, a bayonet 118 and a protrusion 119 are oppositely disposed on the housing 110, and adjacent housings 110 are connected by the bayonet 118 and the protrusion 119.

Specifically, when adjacent housings 110 are stacked, in order to ensure the stability of the connection, a form of fitting between the bayonet 118 and the protrusion 119 may be adopted, and in such a form of fitting, an arc may be generated to be ejected from a gap between the bayonet 118 and the protrusion 119, thereby affecting the stability of the electrical connection. In the embodiment of the present application, the number of the bayonet 118 and the protrusion 119 is reduced as much as possible, and therefore, in the embodiment, it is preferable that only one bayonet 118 and one protrusion 119 are engaged. And the fastening position of the bayonet 118 and the protrusion 119 is far away from the area where the fastening member 130 and the wiring portion 126 are located, so that the stability of wiring is prevented from being affected by the matching position of the bayonet 118 and the protrusion 119, and meanwhile, the matching position of the bayonet 118 and the protrusion 119 between adjacent layers is staggered, so that the connection stability is improved. In addition, in the embodiment of the present application, two or more sets of the bayonet 118 and the protrusion 119 may be used, and the matching position of the bayonet 118 and the protrusion 119 is as far away from the position of the wire connecting portion 126 as possible.

As shown in fig. 5, the switch unit 100 further includes an auxiliary pin, one end of the auxiliary pin is connected to the first stationary contact 120 or the second stationary contact, the other end of the auxiliary pin is welded to the circuit board, and a U-shaped groove 111 for accommodating the auxiliary pin is correspondingly disposed on the housing 110.

Specifically, the first stationary contact 120 or the second stationary contact is provided with the auxiliary pin, and the auxiliary pin is welded to the circuit board to realize grounding through the auxiliary pin, so that current is led to the ground when the first stationary contact is struck by lightning, the switch unit 100 can be protected, and the stability of the product during use is improved. Meanwhile, the U-shaped groove 111 is correspondingly formed in the shell 110, so that the auxiliary pin can be insulated and protected in a supporting mode when being limited, and the stability of the switch unit 100 in use is improved.

As shown in fig. 9 and 10, the present embodiment further provides a rotary switch 200, which includes the switch units 100 in the foregoing embodiments, the switch units 100 are stacked by the housing 110, and the plane of the wiring portion 126 of each switch unit 100 is parallel to one side of the rotary switch 200.

Specifically, the number of layers of the stacked switch units 100 is not specifically limited in the embodiment of the present application, and can be flexibly set according to actual needs. For example, the number of the switch units 100 may be 6, 8, or 10, and the like, and may be appropriately set according to the situation of the access line. The rotary switch 200 provided in the embodiment of the present application includes the structure and the advantageous effects of the switch unit 100 in the foregoing embodiments. The first fixed contact 120 comprises a contact portion 122, a connecting portion 124 and a wiring portion 126 which are connected in sequence, and when the switch unit 100 needs to be closed, the movable contact can be rotated to be communicated with the contact portion 122 of the first fixed contact 120, so that the electric connection is realized. When the movable contact is separated from the first stationary contact 120, an arc is generated. The generated arc can be ejected from the arc ejection opening 112, thereby achieving a rapid arc extinguishing effect. In order to facilitate the wiring operation of the switch unit 100, the wiring portion 126 extends to the outside of the housing 110 through the connection portion 124, and the connection portion 124 and the arc ejection port 112 are respectively located at adjacent sidewalls of the housing 110.

Thus, the safe distance between the wiring portion 126 and the arc spraying opening 112 is ensured, and the short circuit is prevented, so that the wiring portion 126 and the arc spraying opening 112 are located on the same plane of the switch unit 100, the thickness of the switch unit 100 is not required to be increased to increase the safe distance, the occupied space is reduced under the same breaking performance, and the safety in use is improved.

Meanwhile, when the wiring personnel perform wiring on the rotary switch 200, the required wiring operation can be realized in the same operation surface, the operation position does not need to be changed frequently, the wiring accuracy can be improved, the wiring difficulty is reduced, and the wiring efficiency is improved.

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 (12)

1. A switch unit is characterized by comprising a shell and at least one first fixed contact arranged in the shell, wherein the first fixed contact comprises a contact part and a wiring part which are connected with each other, at least one side surface of the shell is provided with an arc spraying port, and the wiring part and the arc spraying port are respectively positioned on different side surfaces of the shell.

2. The switch unit of claim 1, wherein the first stationary contact further comprises a connecting portion, the wire connecting portion extends to an outside of the housing through the connecting portion, and the wire connecting portion extends toward a center of the side of the housing.

3. A switch unit according to claim 1 or 2, characterized in that a fastening member is provided on the terminal portion, so that a wire is connected to the terminal portion by means of the fastening member.

4. The switch unit according to claim 3, wherein a first baffle is disposed on a side of the housing where the fastening member is disposed, and a plane of the first baffle is perpendicular to a direction in which the housings are stacked.

5. The switch unit of claim 4, wherein the first baffles of adjacent switch units enclose a U-shaped space with the side edges, the wires being positionable in the U-shaped space.

6. The switch unit of claim 4, wherein a spacing between the first baffles of adjacent housings is greater than or equal to a width of the fastener.

7. The switch unit of claim 4, wherein the housing further comprises a second baffle, the second baffle being disposed in a plane parallel to the stacking direction of the housing.

8. The switch unit according to claim 7, wherein the fixed contact is arranged diagonally in the switch unit, and the second baffle is located on a side of the housing close to an arc spraying opening of the adjacent switch unit.

9. The switch unit of claim 1, wherein the housing is provided with a bayonet and a protrusion, and adjacent housings are connected by the bayonet and the protrusion.

10. The switch unit according to claim 1 or 2, further comprising a second stationary contact, wherein the second stationary contact comprises a contact body and a soldering pin connected to each other, and the soldering pin is used for soldering connection with a circuit board.

11. The switch unit according to claim 10, further comprising an auxiliary pin, wherein one end of the auxiliary pin is connected to the first stationary contact or the second stationary contact, the other end of the auxiliary pin is welded to the circuit board, and the housing is correspondingly provided with a U-shaped groove for accommodating the auxiliary pin.

12. A rotary switch comprising the switch unit according to any one of claims 1 to 10, wherein the switch units are stacked by a housing, and a plane of the terminal portion of each switch unit is parallel to a side surface of the rotary switch.

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