Switching device

Abstract

The switch device comprises a contact unit, the contact unit comprises a contact system and two arc extinguishing systems, the contact system comprises a moving contact assembly and a static contact group, the static contact group comprises two static contacts, the contact unit further comprises an inner shell, the inner space of the inner shell is divided into three parallel cavities in the third direction, and the three parallel cavities are arranged in the third direction. The moving contact assembly comprises two matching cavities located on the two sides and a limiting cavity located in the middle, each matching cavity is internally provided with a static contact and an arc extinguishing system, the limiting cavity is communicated with the two matching cavities, and the moving contact assembly moves in the limiting cavity and the matching cavities in the first direction; the first direction, the second direction and the third direction are perpendicular to one another. According to the switching device, the internal space of the inner shell in the contact unit is divided into three cavities, so that a matching position is provided for matching of an arc extinguishing system and a contact system, and a modular structure is favorably formed.

Description

Technical Field

[0001] The present invention relates to the field of low-voltage electrical appliances, and in particular to a switch device. Background Art

[0002] A switching device is a device that controls the on and off of a circuit. A switching device is usually equipped with one or more contact units. The moving contact assembly in each contact unit usually cooperates with the two static contacts of the static contact group at the same time. Each static contact is equipped with an arc extinguishing system on one side for extinguishing the arc. The arc extinguishing system, static contacts and moving contact assembly are usually arranged in an approximately straight line. Such a structure has the following defects: first, the approximately straight line arrangement structure makes the length of each contact unit larger; second, the internal structure is relatively dispersed, which is not conducive to forming a modular structure. Summary of the Invention

[0003] An object of the present invention is to overcome at least one drawback of the prior art and provide a switch device.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] The present invention provides a switching device, including a contact unit, wherein the contact unit includes a contact system and two arc extinguishing systems, the contact system includes a moving contact assembly and a static contact group, the static contact group includes two static contacts, and the contact unit also includes an inner shell, the internal space of the inner shell is divided into three parallel chambers in a third direction, namely, a matching chamber located at both sides and a limiting chamber located at the middle position, each of the matching chambers is provided with a static contact and an arc extinguishing system, the limiting chamber is respectively connected to the two matching chambers, the moving contact assembly moves in the limiting chamber and the matching chamber along a first direction, and the first direction, the second direction and the third direction are respectively perpendicular to each other.

[0006] Preferably, the moving contact assembly includes a contact support and a moving contact bridge, and the moving contact bridge is arranged in the accommodating cavity of the contact support along the third direction. The two ends of the moving contact bridge serve as moving contact parts respectively, and in the second direction, the static contact part of each static contact cooperates with a dynamic contact part corresponding to one side of an arc extinguishing system.

[0007] Preferably, in the second direction, the length of the limiting cavity is smaller than the length of the matching cavity, and the limiting cavity is communicated with the two matching cavities, so that the inner shell forms a U-shaped structure or an H-shaped structure.

[0008] Preferably, the limiting cavity passes through the inside and outside of the inner shell along the first direction, and the contact support moves along the first direction in the limiting cavity, so that the two ends of the moving contact bridge move along the first direction in the two matching cavities respectively.

[0009] Preferably, the inner shell includes a bracket and a cover plate, the cover plate covers the bracket along the first direction, and a wire threading groove is provided at the connection between the cover plate and the bracket.

[0010] Preferably, the static contact includes a static contact plate, the middle part of the static contact plate is bent at least once so that the two ends of the static contact plate are arranged at an angle. In the second direction, at least a part of the middle part of the static contact plate corresponds to the area between the moving contact assembly and the static contact, so that the current flowing through the middle part of the static contact plate is opposite to the direction of the arc current generated when the contact system is disconnected.

[0011] Preferably, the arc extinguishing system includes an arc extinguishing chamber, which includes a plurality of arc extinguishing grids arranged at intervals along a first direction, with an arc extinguishing gap left between two adjacent arc extinguishing grids, and an arc extinguishing notch is provided at one end edge of each arc extinguishing grid, and all arc extinguishing notches are connected along the first direction to form an arc extinguishing groove facing the contact system.

[0012] Preferably, the arc extinguishing system includes a moving arc-striking plate and a static arc-striking plate spaced opposite to each other in a first direction, one end of the moving arc-striking plate is connected to the moving contact bridge, and the other end of the moving arc-striking plate extends toward the arc extinguishing system, one end of the static arc-striking plate is connected to a static contact, and the other end of the static arc-striking plate extends to one end of the arc extinguishing system.

[0013] Preferably, the moving contact portion is provided with a moving contact, and the edge of the moving contact bridge on at least one side of the moving contact extends outward to form a moving arc-striking portion, and the side of the moving arc-striking portion facing the static contact portion is an inclined surface, and the moving arc-striking plate is connected to the moving arc-striking portion on the side close to the arc extinguishing system.

[0014] Preferably, the arc extinguishing system further comprises a pair of magnetic conductive plates spaced apart in the third direction, the arc extinguishing chamber is arranged between the pair of magnetic conductive plates, and the magnetic conductive plates are attached to the outer surface of the inner shell.

[0015] Preferably, the magnetic conductive plates are made of magnetic material, and / or a permanent magnet is further provided between a pair of magnetic conductive plates, and the permanent magnet and the contact system are located on opposite sides of the arc extinguishing chamber in the second direction.

[0016] Preferably, the two magnetic poles of the permanent magnet are respectively directed toward a pair of magnetic conductive plates.

[0017] Preferably, the arc extinguishing chamber further includes a pair of gas producing parts spaced apart in the third direction, wherein in the second direction, the gas producing parts are located between the contact system and the arc extinguishing chamber, and in the first direction, the gas producing parts are located between the moving arc striking plate and the static arc striking plate.

[0018] Preferably, the arc extinguishing chamber is further provided with an insulating partition, which is arranged on a side of the arc extinguishing chamber away from the arc extinguishing groove. One side of the insulating partition is provided with a plurality of plug-in parts, which are plugged into the arc extinguishing gap, and the other side of the insulating partition is provided with a plurality of insulating grids arranged at intervals.

[0019] In the switch device of the present invention, the internal space of the inner shell in the contact unit is divided into three chambers, which provides a matching position for the arc extinguishing system and the contact system, and is conducive to forming a modular structure.

[0020] In addition, the inner shell is a U-shaped structure or an H-shaped structure, which helps to reduce the space occupied by the inner shell and also reduces costs.

[0021] In addition, the arc extinguishing chamber is equipped with an insulating plate to improve the arc extinguishing effect and safety of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic diagram of the structure of the contact unit in the present invention (including the inner shell);

[0023] Figure 2 Schematic diagram of the structure of the contact unit in the present invention (the cover plate and the bracket are separated);

[0024] Figure 3 Schematic diagram of the structure of the contact unit in the present invention (with the cover removed);

[0025] Figure 4 This is a schematic diagram of the structure of the contact unit in the present invention. Figure 1 (Remove the inner shell);

[0026] Figure 5 It is a schematic structural diagram of the bracket in the present invention;

[0027] Figure 6 This is a schematic diagram of the structure of the contact unit in the present invention. Figure 2 (Remove the inner shell);

[0028] Figure 7 This is a schematic diagram of the structure of the contact unit in the present invention. Figure 3 (Remove the inner shell);

[0029] Figure 8 This is a schematic diagram of the structure of the contact unit in the present invention. Figure 4 (Remove the inner shell and separate the insulating partition);

[0030] Figure 9 This is a schematic diagram of the structure of the contact unit in the present invention. Figure 4 (Inner shell and insulating partition removed)

[0031] Figure 10 This is a schematic diagram of the coordination of the moving contact bridge, the static contact, and the arc extinguishing chamber in the present invention;

[0032] Figure 11 It is a schematic diagram of the current flow between the moving contact assembly and the static contact in the present invention;

[0033] Figure 12 This is a schematic diagram of the current flow during arc extinguishing in the present invention;

[0034] Figure 13 Schematic diagram of the magnetic field at the moving contact assembly and the static contact in the present invention;

[0035] Figure 14 is a schematic diagram of the base, contact unit and electromagnetic system in the present invention;

[0036] Reference numerals:

[0037] 11-base, 13-inner shell, 13a-first groove, 13b-first through slot, 131-bracket, 132-cover plate, 133-threading groove, 141-limiting cavity, 142-matching cavity, 2-contact unit, 21-moving contact assembly, 211-contact support, 2110-accommodating cavity, 212-moving contact bridge, 2121-moving contact part, 2122-moving contact point, 2123-moving arc striking part, 213 -contact spring, 22-static contact, 221-static contact plate, 2211-static contact part, 2212-connection part, 2213-connecting section, 2214-static contact, 23-arc extinguishing system, 231-arc extinguishing chamber, 232-magnetic conductive plate, 233-permanent magnet, 2341-moving arc-striking plate, 2342-static arc-striking plate, 235-insulating partition, 236-gas-generating part, b1-second connecting hole, 3-electromagnetic system. DETAILED DESCRIPTION

[0038] The following embodiments are combined with the accompanying drawings to further illustrate the specific implementation of the switch device of the present invention. The switch device of the present invention is not limited to the description of the following embodiments.

[0039] The switchgear includes a base (see Figure 14 ), two contact units 2 are arranged in the base, each contact unit 2 includes a contact system and an arc extinguishing system 23, the contact system is connected between a pair of wiring components, a pair of wiring components are divided into input terminals and output terminals, the contact system includes a moving contact component 21 and a static contact group that cooperate with each other, the moving contact component 21 is directly or indirectly driven by the moving iron core 32, the static contact group includes two static contacts 22, each static contact 22 is provided with a wiring portion 2212 for connecting to a wiring component, each wiring portion 2212 corresponds to a wiring slot opened on the base, and the arc extinguishing system 23 is arranged on one side of the contact system for extinguishing the arc generated when the contact system is opened and closed.

[0040] An electromagnetic system 3 (not shown) for driving the contact unit 2 is also provided in the base. The electromagnetic system 3 includes a coil assembly, a moving iron core and a static iron core. The coil assembly is usually connected to a control system (not shown). The control system can be provided in the base or outside the base. The static iron core and the moving iron core are respectively provided on the coil assembly. A magnetic gap is left between the moving iron core and the static iron core (the magnetic gap refers to a very short air distance between two magnetic materials in the magnetic circuit). The coil assembly drives the moving iron core to move according to the control signal output by the control system. The electromagnetic system 3 can adopt existing technology.

[0041] For the convenience of description, the length direction of the base is the first direction, the height direction of the base is the second direction, and the thickness direction of the base is the third direction, corresponding to Figure 2 、 14 , the directions of the X-axis, the Y-axis, and the Z-axis are the first direction, the second direction, and the third direction, respectively.

[0042] The improvement of this application is that Figure 1-10 As shown, the contact unit 2 also includes an inner shell 13, and the internal space of the inner shell 13 is divided into three parallel chambers in the third direction, namely, a mating cavity 142 located at both sides and a limiting cavity 141 located in the middle position. A static contact 22 and an arc extinguishing system 23 are provided in each mating cavity 142, and the limiting cavity 141 is respectively connected to the two mating cavities 142, and the moving contact assembly 21 moves in the limiting cavity 141 and the mating cavity 142 along the first direction.

[0043] In this way, the internal space of the inner shell 13 is divided into three chambers, which provides a matching position for the arc extinguishing system 23 and the contact system, and is conducive to forming a modular structure.

[0044] Furthermore, in the second direction, the length of the limiting cavity 141 is smaller than the length of the two matching cavities 142 , so that the inner shell 13 as a whole forms a U-shaped structure or an H-shaped structure, which is beneficial to reducing the space occupied by the inner shell and reducing costs.

[0045] Preferably, the limiting cavity 141 is connected to the two matching cavities 142 in the third direction respectively, the limiting cavity 141 passes through the inside and outside of the inner shell 13 in the first direction, the contact support 211 moves along the first direction in the limiting cavity 141, and the two ends of the moving contact bridge 212 move along the first direction in the two matching cavities 142 respectively.

[0046] Combine Figure 1-14 A specific embodiment of a switch device is provided.

[0047] The switching device includes a base, which includes a base 11. A cover (not shown) is covered on the base 11 to form a closed rectangular structure. An electromagnetic system 3 is arranged in the middle of the base. The electromagnetic system 3 includes a coil assembly and a moving iron core 32 and a static iron core 33 arranged on the coil assembly. The central axis of the coil assembly is parallel to the first direction, and the moving iron core 32 and the static iron core 33 are spaced relative to each other in the first direction to form a magnetic gap for driving the moving iron core 32 to move along the first direction. The electromagnetic system 3 can adopt existing technology. The distribution structure of the electromagnetic system 3 and the contact unit 2 can be specifically referred to the structure thereof arranged in the base 11.

[0048] like Figure 14 As shown, a contact unit 2 is provided at each end of the base, so that the two contact units 2 are located on opposite sides of the electromagnetic system 3 in the first direction, as shown in FIG. Figure 1-13 As shown, each contact unit 2 includes a contact system and an arc extinguishing system 23. The contact system includes a moving contact assembly 21 and a static contact group that cooperate with each other. The moving contact assembly 21 of each contact unit 22 is directly or indirectly driven and connected to the moving iron core 32, so that the moving contact assembly 21 approaches or moves away from the static contact group along a first direction. The static contact group includes two static contacts 22, each static contact 22 is provided with a wiring portion 2212, and each wiring portion 2212 corresponds to a wiring slot provided on the base. In the second direction, the wiring portion 2212 is spaced apart from the moving contact assembly 21. The arc extinguishing system 23 is arranged on one side of the contact system for extinguishing the arc generated when the contact system is disconnected. The arc extinguishing system 23, the moving contact assembly 21 and the wiring portion 2212 are arranged in sequence in the second direction, that is, the moving contact assembly 21 moves between the wiring portion 2212 and the arc extinguishing system 23, and the two arc extinguishing systems 23 are spaced apart from each other in the third direction.

[0049] like Figure 1-6 As shown, each contact unit 2 also includes an inner shell 13, and the contact system and the arc extinguishing system 23 are arranged at one end of the base through the inner shell 13. That is, the two contact units of this embodiment are respectively arranged at the two ends of the base through their own inner shells 13, which is conducive to forming a modular structure of each contact unit 2 and convenient disassembly and assembly.

[0050] In this embodiment, the internal space of the inner shell 13 is divided into three parallel chambers in the third direction, wherein the chambers located on both sides are mating chambers 142, each mating chamber 142 is provided with a static contact 22 and an arc extinguishing system 23, and the chamber located in the middle position serves as a limiting chamber 141 and is respectively connected to the two mating chambers 142, and the moving contact assembly 21 moves in the limiting chamber 141 and the mating chamber 142 along the first direction.

[0051] Specific as Figure 1 、 2As shown in Figure 5, the inner shell 13 includes two mating cavities 142 spaced apart in the third direction, each mating cavity 142 is a relatively closed chamber structure, and each mating cavity 142 is also provided with a wire threading groove 133. An arc extinguishing system 23 and a static contact 22 are provided in each mating cavity 142, and the wiring portion 2212 on the static contact 22 can extend from the wire threading groove 133 and the wiring groove of the base to the outside of the base; a through groove is provided between the two mating cavities 142, and the through groove passes through the first direction as a limiting cavity 141, and is respectively connected with the two mating cavities 142 in the third direction, and the moving contact assembly 21 moves in a straight line in the limiting cavity 141 and the two mating cavities 142, that is, it moves along the first direction.

[0052] Preferably, in the second direction, the length of the limiting cavity 141 is smaller than the length of the matching cavity 142, so that the inner shell 13 as a whole forms a U-shaped structure or an H-shaped structure. Such a structure is conducive to reducing the cost of the inner shell 13 and reducing the space occupied by the inner shell 13 in the base 11.

[0053] In this embodiment, if Figure 5 As shown, the inner shell 13 includes a bracket 131 and a cover plate 132 covering the bracket 131. Figure 2 In the embodiment, the cover 132 covers one end of the bracket 131 along the first direction. The cover 132 can cover one end of the bracket 13 away from the electromagnetic system 3 (for example, Figure 14 The inner shell 13 at the right end of the middle base) or one end of the bracket 13 close to the electromagnetic system 3 (for example Figure 14 The inner shell 13 at the left end of the middle base), each dynamic contact portion 2121 moves between the bracket 13 and the cover plate 132, wherein the bracket 131 and the cover plate 132 each include two first grooves 13a and a first through groove 13b located between the two first grooves 13a, the two first grooves 13a are spaced apart in the third direction, and the first through grooves 13b are respectively connected to the two first grooves 13a. When the bracket 131 and the cover plate 132 cooperate to form a complete inner shell 13, the first grooves 13a of the bracket 131 and the cover plate 132 are docked to form a mating cavity 142. The two first through grooves 13b are connected to form a limiting cavity 141; the wire threading groove 133 opened on the inner shell 13 is located at the junction of the bracket 131 and the cover plate 132, that is, the wire threading groove 133 is located at the junction of the two first grooves 13a. In the second direction, the inner shell 13 is provided with a wire threading groove 133, one end of which extends outward to accommodate as many static contacts 22 as possible, so that the cross-sectional shape of the bracket 131 and the cover plate 132 is approximately H-shaped. Of course, when the end of the inner shell 13 provided with the wire threading groove 133 does not need to extend outward, the inner shell 13 is U-shaped as a whole.

[0054] The base is provided with wiring slots at positions corresponding to the mating cavity 142, and each wiring slot corresponds to the wiring portion 2212 of the static contact 22. The wiring portion 2212 can extend from the corresponding wiring slot to the outside of the base, or the wiring portion 2212 can be located inside the base, with only the wiring hole of the wiring portion 2212 corresponding to the wiring slot. In this embodiment, each wiring portion 2212 can be provided with a nut, so that the wiring portion 2212 can be conveniently connected to the wiring screw of the wiring assembly, and the wiring assembly can adopt existing technology.

[0055] Combine Figure 6-10 The specific structure of the contact system in this embodiment is provided.

[0056] like Figure 7-10 As shown, the contact system includes a cooperating movable contact assembly 21 and a stationary contact group, wherein the movable contact assembly 21 and the stationary contact group are spaced apart in a first direction. The movable contact assembly 21 includes a contact support 211 and a movable contact bridge 212, wherein the movable contact bridge 212 is arranged along a third direction within a receiving cavity 2110 of the contact support 211. The two ends of the movable contact bridge 212 respectively extend outside the contact support 211 as two movable contact portions 2121. The contact support 211 is linked to the linkage member 35, that is, a second connection hole b1 is provided on the contact support 211. Furthermore, a contact spring 213 is also provided within the receiving cavity 2110. The contact spring 213 is arranged on the side of the movable contact bridge 212 facing away from the stationary contact 22, and is used to provide contact pressure when the contact system is closed.

[0057] like Figure 6 、 7 As shown, the moving contact bridge 212 is a strip-shaped plate structure as a whole, and the two ends of the moving contact bridge 212 serve as moving contact parts 2121 respectively. Each moving contact part 2121 is spaced apart from the static contact part 2211 of a static contact 22, and each moving contact part 2121 is provided with a moving contact point 2122. The edge of the moving contact bridge 212 on at least one side of each moving contact point 2122 extends outward to form a moving arc-striking part 2123, and the edge of the moving contact bridge 212 close to the arc extinguishing system 23 is provided with a moving arc-striking part 2123. In this embodiment, the moving contacts 2122 on both sides are arranged on the moving contact points 2122. The edges of the contact bridge 212 extend outward to form a moving arc-striking portion 2123, and the side of each moving arc-striking portion 2123 facing the static contact portion 2211 is an inclined surface, and the thickness of each moving arc-striking portion 2123 gradually decreases along the direction from the moving contact point 2122 to the edge of the moving contact bridge 212. Furthermore, a moving arc-striking portion 2123 on each moving contact portion 2121 is connected to a moving arc-striking plate 2341, and the moving arc-striking plate 2341 can extend obliquely along the inclined surface of the moving arc-striking portion 2123, which not only facilitates the assembly of the moving arc-striking plate 2341, but also improves the arc-striking efficiency.

[0058] In this embodiment, the contact support 211 in each moving contact assembly slides with the limiting cavity 141, so that the contact support 211 moves along the first direction in the limiting cavity 141, and the two moving contact portions 2121 of the moving contact bridge 212 respectively contact or separate with the static contact portions 2211 of the two static contacts 22 in the two matching cavities 142.

[0059] like Figure 6-9 As shown, the static contact group includes two static contacts 22 arranged side by side. When the contact system is arranged at the same end of the base, the two static contacts 22 are spaced apart in the third direction, and each static contact 22 is extended along the second direction at a position close to the end of the base. In this embodiment, each static contact 22 includes a straight-plate-shaped static contact plate 221, and each static contact plate 221 is provided with a static contact portion 2211 and a wiring portion 2212 at both ends. The static contact portion 2211 is provided with a static contact point 2214, and the wiring portion 2212 is provided with a wiring hole. The two static contact plates 221 are parallel to each other. The rows are arranged on the same side of the moving contact assembly 21, and the middle parts of the two static contact plates 221 in the same contact system are bent in the same direction at least once. That is, the two static contact plates 221 in the same contact system are always arranged side by side, so that the static contact portion 2211 and the wiring portion 2212 of the same static contact plate 221 respectively correspond to the adjacent two sides of the moving contact assembly 21. At this time, the plane where the static contact portion 2211 is located is arranged at an angle to the plane where the wiring portion 2212 is located. Preferably, the plane where the static contact portion 2211 is located is perpendicular to the plane where the wiring portion 2212 is located.

[0060] When the static contact 22 is arranged in the base, the static contact portion 2211 is arranged at a position close to the end of the base in the second direction, the static contact portion 2211 and the moving contact portion 2121 are spaced opposite to each other in the first direction, the wiring portion 2212 is arranged along the first direction, and each wiring portion 2212 is spaced opposite to the moving contact assembly 21 in the second direction, and the wiring portion 2212 corresponds to the wiring slot opened on the base. In this embodiment, one wiring portion 2212 in the same contact system is used for incoming lines, and the other wiring portion 2212 is used for outgoing lines.

[0061] Further, such as Figure 7-10As shown, in the second direction, at least a portion of the middle area of ​​the static contact plate 221 corresponds to the gap between the static contact portion 2211 and the dynamic contact portion 2121, so that the current flowing through the middle of the static contact plate 221 is opposite to the arc current generated between the dynamic contact portion 2121 and the static contact portion 2211. In the figure, the middle area of ​​the static contact plate 221 connected between the wiring portion 2212 and the static contact portion 2211 is a connecting section 2213, and the connecting section 2213 is approximately arranged along the first direction. The connecting section 2213 can be bent once or more than once, so that the static contact plate 221 is L-shaped as a whole, or the static contact plate 221 is Z-shaped as a whole; the edge of one end of the static contact portion 2211 away from the wiring portion 2212 can extend outward to form a static arc-striking portion, and the side of the static arc-striking portion facing the dynamic contact assembly 21 is an inclined surface, and the inclined surface of the static arc-striking portion is also conducive to connecting the static arc-striking plate 2342.

[0062] like Figure 2-3 As shown in Figures 7-9, each contact unit 2 also includes two arc extinguishing systems 23, which are spaced apart inside the same end of the base in the third direction. In the second direction, each static contact 22 is located above an arc extinguishing system 23, so that each moving contact part 2121 and the static contact part 2211 are in contact or separation on one side of an arc extinguishing system 23 respectively, and the arc generated when the moving contact part 2121 is separated from the static contact part 2211 is extinguished by the arc extinguishing system 23.

[0063] Specific as Figure 3 、 4 As shown in Figures 6-13, each arc extinguishing system 23 includes an arc extinguishing chamber 231, a dynamic arc striking plate 2341, and a static arc striking plate 2342. The arc extinguishing chamber 231 can adopt existing technology. The arc extinguishing chamber 231 includes a plurality of arc extinguishing grids arranged at intervals, and an arc extinguishing gap is left between two adjacent arc extinguishing grids. Preferably, the plurality of arc extinguishing grids are arranged at intervals along the first direction, and an arc extinguishing notch is opened at one end edge of each arc extinguishing grid. All arc extinguishing notches are connected along the first direction to form an arc extinguishing groove, and the arc extinguishing groove faces the contact system; dynamic arc striking Plate 2341 and the static arc-striking plate 2342 are spaced apart from each other in the first direction, one end of the moving arc-striking plate 2341 is connected to a moving arc-striking portion 2123, and the moving arc-striking plate 2341 extends into the arc extinguishing chamber 231 along the inclined surface of the moving arc-striking portion 2123. As the moving contact assembly 21 moves in the first direction, the other end of the moving arc-striking plate 2341 moves accordingly in the arc extinguishing groove; one end of the static arc-striking plate 2342 is connected to the static contact 22, and the other end of the static arc-striking plate 2342 extends into the arc extinguishing chamber 231.

[0064] In this embodiment, if Figure 2 、 3As shown in Figures 6-8, the arc extinguishing chamber 231 includes a pair of gas producing members 236, which are spaced apart and opposite to each other in the third direction. In the second direction, the gas producing members 236 are located between the contact system and the arc extinguishing chamber 231. It can also be understood that the gas producing members 236 correspond to both sides of the arc entrance of the arc extinguishing chamber 231, and the arc extinguishing grooves correspond to the arc entrance. In the first direction, the gas producing member 236 is located between the moving arc striking plate 2341 and the static arc striking plate 2342. The gas generated by the gas producing member 236 pushes the arc into the arc extinguishing chamber 231. The arc extinguishing chamber 231 It also includes an insulating partition 235, which is arranged on the side of the arc extinguishing chamber 231 away from the arc extinguishing groove, that is, in the second direction, the insulating partition 235 and the contact system are respectively located on the opposite sides of the arc extinguishing chamber 231, and a plurality of plug-in parts are provided on one side of the insulating partition 235, each of which can be correspondingly plugged into an arc extinguishing gap, and a plurality of insulating grids arranged at intervals are provided on the other side of the insulating partition 235. The insulating partition 235 insulates and isolates the side of the arc extinguishing chamber 231 away from the contact system, which is conducive to improving safety in use.

[0065] When the contact system is disconnected, the current flowing through the connecting section 2213 is in the opposite direction to the arc current, and the arc is driven into the arc extinguishing chamber 231 by the repulsive force and extinguished.

[0066] Preferably, each arc extinguishing system 23 further includes a pair of magnetic conductive plates 232 spaced apart in the third direction. The magnetic conductive plates 232 of each arc extinguishing system 23 are fitted to the outer surface of each matching cavity 142. In this embodiment, the magnetic conductive plates 232 are located in the gap between the base and the inner shell 13. Each arc extinguishing chamber 231 and the gas generating member 236 are correspondingly arranged between the pair of magnetic conductive plates 232. A permanent magnet 233 is also arranged between the pair of magnetic conductive plates 232, wherein the two magnetic poles of the permanent magnet 233 are respectively facing the two magnetic conductive plates 232. Figure 7 、 8 In the embodiment, the permanent magnet 233 and the static arc-striking plate 2342 correspond to the same end of the arc-extinguishing chamber 231, that is, the end away from the moving contact assembly 21. Correspondingly, a magnetic field for arc-striking is formed in the arc-extinguishing chamber 231 and the gas-generating part 236. In this embodiment, the magnetic fields formed by the magnetic conductive plate 232 and the permanent magnet 233 in the two arc-extinguishing systems 23 are in opposite directions, such as Figure 13 As shown, when the operating current is small, in the same contact system, the arc generated when one movable contact portion 2121 and the static contact portion 2211 are disconnected is affected by the permanent magnet 233, causing the arc to move away from the arc extinguishing chamber 231 under the action of the Lorentz force, and the arc generated when the other movable contact portion 2121 and the static contact portion 2211 are disconnected is affected by the permanent magnet 233, causing the arc to enter the arc extinguishing chamber 231 under the action of the Lorentz force; Figure 12As shown, when the operating current is large (short circuit or overload), the larger current flowing through the middle of the two stationary contact plates 221 in the same contact system generates a magnetic field with a strength greater than that generated by the permanent magnet 233. As a result, the arc generated when the same contact system is disconnected is driven into the arc extinguishing chamber 231, causing the arc voltage to increase rapidly and extinguish. Of course, the permanent magnet 233 can be omitted, and the magnetic conductive plate 232 can be made of a magnetic material. However, making the magnetic conductive plate 232 of a magnetic material increases the cost.

[0067] It should be noted that, in the description of the present invention, the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are conventionally placed in use. They are intended solely for ease of description and do not necessarily require the devices or components referred to to have a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third," etc., are used solely for distinction and description and should not be construed as indicating relative importance.

[0068] The above is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific implementation of the present invention should not be considered to be limited to these descriptions. For those skilled in the art of the present invention, without departing from the concept of the present invention, several simple deductions or substitutions can be made, which should be considered to fall within the scope of protection of the present invention.

Claims

1. A switch device comprising a contact unit (2), the contact unit (2) comprising a contact system and two arc extinguishing systems (23), the contact system comprising a moving contact assembly (21) and a stationary contact group, the stationary contact group comprising two stationary contacts (22), characterized in that: The contact unit (2) further comprises an inner shell (13), the internal space of the inner shell (13) being divided into three parallel chambers in a third direction, namely, matching chambers (142) located at both sides and a limiting chamber (141) located at a middle position, each matching chamber (142) being provided with a static contact (22) and an arc extinguishing system (23), the limiting chamber (141) being respectively connected to the two matching chambers (142), the moving contact assembly (21) moving in the limiting chamber (141) and the matching chamber (142) along a first direction, and the first direction, the second direction and the third direction being perpendicular to each other.

2. The switch device according to claim 1, characterized in that: The moving contact assembly (21) comprises a contact support (211) and a moving contact bridge (212); the moving contact bridge (212) is arranged in a receiving cavity (2110) of the contact support (211) along a third direction; both ends of the moving contact bridge (212) serve as moving contact portions (2121); in a second direction, the static contact portion (2211) of each static contact (22) cooperates with a dynamic contact portion (2121) on one side of an arc extinguishing system (23).

3. The switch device according to claim 2, characterized in that: In the second direction, the length of the limiting cavity (141) is smaller than the length of the matching cavity (142), and the limiting cavity (141) and the two matching cavities (142) are interconnected, so that the inner shell (13) forms a U-shaped structure or an H-shaped structure.

4. The switch device according to claim 2 or 3, characterized in that: The limiting cavity (141) penetrates the inside and outside of the inner shell (13) along a first direction, and the contact support (211) moves along the first direction in the limiting cavity (141), so that the two ends of the moving contact bridge (212) move along the first direction in the two matching cavities (142) respectively.

5. The switch device according to claim 4, characterized in that: The inner shell (13) comprises a bracket (131) and a cover plate (132); the cover plate (132) covers the bracket (131) along a first direction; a wire threading groove (133) is provided at the junction of the cover plate (132) and the bracket (131).

6. The switch device according to claim 1, characterized in that: The static contact (22) comprises a static contact plate (221), the middle portion of the static contact plate (221) is bent at least once, so that the two ends of the static contact plate (221) are arranged at an angle, and in the second direction, at least a part of the middle portion of the static contact plate (221) corresponds to the area between the moving contact assembly (21) and the static contact (22), so that the current flowing through the middle portion of the static contact plate (221) is opposite to the direction of the arc current generated when the contact system is disconnected.

7. The switch device according to claim 1, characterized in that: The arc extinguishing system (23) comprises an arc extinguishing chamber (231), wherein the arc extinguishing chamber (231) comprises a plurality of arc extinguishing grids spaced apart along a first direction, an arc extinguishing gap is left between two adjacent arc extinguishing grids, an arc extinguishing notch is provided at one end edge of each arc extinguishing grid, and all arc extinguishing notches are connected along the first direction to form an arc extinguishing groove facing the contact system.

8. The switch device according to claim 7, characterized in that: The arc extinguishing system (23) comprises a movable arc-striking plate (2341) and a static arc-striking plate (2342) spaced apart from each other in a first direction, one end of the movable arc-striking plate (2341) is connected to the movable contact bridge (212), the other end of the movable arc-striking plate (2341) extends in the direction of the arc extinguishing system (23), one end of the static arc-striking plate (2342) is connected to a static contact (22), and the other end of the static arc-striking plate (2342) extends to one end of the arc extinguishing system (23).

9. The switch device according to claim 8, characterized in that: The moving contact portion (2121) is provided with a moving contact (2122); the edge of the moving contact bridge (212) on at least one side of the moving contact (2122) extends outward to form a moving arc-striking portion (2123); the side of the moving arc-striking portion (2123) facing the static contact portion (2211) is an inclined surface; and the moving arc-striking plate (2341) is connected to the moving arc-striking portion (2123) on a side close to the arc extinguishing system (23).

10. The switch device according to claim 9, characterized in that: The arc extinguishing system (23) further includes a pair of magnetic conductive plates (232) spaced apart in a third direction, the arc extinguishing chamber (231) is disposed between the pair of magnetic conductive plates (232), and the magnetic conductive plates (232) are disposed in contact with the outer surface of the inner shell (13).

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