Contact unit and disconnecting switch

Abstract

The contact unit and the disconnecting switch comprise a shell, a contact mechanism and two arc extinguishing systems, the contact mechanism and the two arc extinguishing systems are arranged in the shell, the contact mechanism is arranged between the two arc extinguishing systems in the first direction of the shell, each arc extinguishing system comprises an arc extinguishing chamber and a buffer area, the arc extinguishing chamber comprises an arc extinguishing cover, one end of the arc extinguishing cover is provided with an arc inlet, and the other end of the arc extinguishing cover is provided with an arc outlet. The arc inlet is communicated with the contact mechanism in the first direction of the shell, the buffer area and the arc extinguishing chamber are arranged in the second direction of the shell, the buffer area is connected with the exhaust hole of the arc extinguishing chamber, and the first direction is perpendicular to the second direction. The contact unit, the disconnecting switch, the contact mechanism and the arc extinguishing system are communicated in the first direction, arc can flow into the arc extinguishing system, the buffer area and the arc extinguishing cover are arranged in the second direction, the flowing path of the arc in the arc extinguishing cover is prolonged, arc extinguishing efficiency can be improved, meanwhile, the buffer area fully absorbs and cools tail gas generated after the arc is extinguished, and the service life of the arc extinguishing system is prolonged. And the use safety can be improved.

Description

Technical Field

[0001] The invention relates to the field of switch electrical appliances, and in particular to a contact unit and an isolating switch. Background Art

[0002] With the rapid development of the AC and DC electrical industry, rotary isolating switches have been widely used. Isolating switches are switching devices that have both isolating and switching functions. Traditional rotary isolating switches are usually equipped with an operating module and a contact module driven by the operating module. The contact module includes a plurality of stacked contact units. Each contact unit is usually equipped with a contact mechanism and an arc extinguishing system. Existing contact units usually have the following defects: First, the internal layout of the contact unit is complex, which is not conducive to introducing the arc generated by the contact mechanism breaking into the arc extinguishing system; second, the contact mechanism has many components and is inconvenient to assemble; third, the arc extinguishing system is limited by space and the arc extinguishing effect is not good; fourth, the high-temperature exhaust gas discharged after the arc extinguishing system is extinguished affects safe use; fifth, the internal layout of the contact unit is complex, especially the contact mechanism and arc extinguishing system do not have a modular structure, the assembly is cumbersome, and it cannot meet the modular development of isolating switches. Summary of the invention

[0003] The object of the present invention is to overcome at least one defect of the prior art and to provide a contact unit and a disconnector with a simple structure, arc striking and arc extinguishing efficiency and a high degree of modularization.

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

[0005] The present invention provides a contact unit, comprising a shell, a contact mechanism and two arc extinguishing systems arranged in the shell, wherein the contact mechanism is arranged between the two arc extinguishing systems along a first direction of the shell, the arc extinguishing system comprises an arc extinguishing chamber and a buffer zone, the arc extinguishing chamber comprises an arc extinguishing cover, one end of the arc extinguishing cover is provided with an arc entry port, the arc entry port is connected with the contact mechanism in the first direction of the shell, the buffer zone and the arc extinguishing cover are arranged along a second direction of the shell, and the buffer zone is connected with the exhaust hole of the arc extinguishing chamber, and the first direction is perpendicular to the second direction.

[0006] Preferably, the contact mechanism includes a shell, a moving contact assembly and a pair of stationary contact assemblies, the accommodating cavity of the shell is provided with two opposite openings, each opening is respectively connected to an arc entry opening, a pair of stationary contact assemblies are arranged in the accommodating cavity between the two openings at intervals along a first direction, and a pair of stationary contact assemblies are offset relative to each other in a second direction, and the moving contact assembly is rotatably arranged between the pair of stationary contact assemblies.

[0007] Preferably, the moving contact assembly is provided with two opening limit parts, and two opening barrier parts are provided in the accommodating cavity, and each opening barrier part is located on the moving track of the opening limit part.

[0008] Preferably, the two opening blocking parts are spaced apart along the first direction, and the two opening blocking parts are offset relative to each other in the second direction, and when the moving contact assembly rotates to the opening position, the opening limiting part abuts and cooperates with the opening blocking part to block the two openings from being connected to each other.

[0009] Preferably, the arc extinguishing system further comprises two grid plate groups spaced opposite to each other in the second direction, an arc running channel connected to the arc entrance port is formed between the two grid plate groups, each grid plate group is provided with an arc extinguishing groove connected to the arc entrance port, and the groove line of the arc extinguishing groove is arranged along the first direction.

[0010] Preferably, the two grid plate groups are short-circuited at one end away from the arc entrance at the same potential.

[0011] Preferably, the two grid groups and the arc running channel are arranged in the same arc extinguishing cover to form an arc extinguishing chamber, or the two grid groups are respectively arranged in two arc extinguishing covers to form two arc extinguishing chambers, openings are provided on opposite sides of the two arc extinguishing covers, the arc extinguishing groove of each grid group is opposite to the opening, and the arc running channel is formed between the two arc extinguishing grooves.

[0012] Preferably, a short-circuit plate is provided at one end of the arc running channel away from the arc entrance, two pins of the short-circuit plate are respectively close to one end of the two grid groups away from the arc entrance along the second direction, and the arc starting plate of the short-circuit plate extends toward the arc entrance along the first direction.

[0013] Preferably, a connecting grid group is provided at one end of the arc running channel away from the arc entrance port, and two ends of the connecting grid group are respectively spaced opposite to one end of each grid group away from the arc entrance port, so that the gap between one end of each grid group away from the arc entrance port and the connecting grid group is smaller than the minimum physical interval between two grid groups.

[0014] Preferably, the arc extinguishing system further comprises a connecting arc extinguishing chamber arranged along the second direction, and a connecting grid group is arranged inside the connecting arc extinguishing chamber.

[0015] Preferably, the arc extinguishing system further comprises at least two magnetic conductive plates, at least two magnetic conductive plates are arranged at intervals in a third direction, the arc running channel is located between the two magnetic conductive plates, and the third direction is perpendicular to the first direction and the second direction respectively.

[0016] Preferably, a side wall of the arc extinguishing hood adjacent to the arc entrance is provided with a plurality of exhaust holes spaced apart along a first direction, and two adjacent exhaust holes are staggered in a third direction, and the third direction is perpendicular to the first direction and the second direction respectively.

[0017] Preferably, the buffer zone is provided with a plurality of columns along the third direction, and the columns are opposite to the exhaust holes in the second direction.

[0018] Preferably, at least one set of limiting structures is arranged between the outer shell and the shell, and each set of limiting structures includes a concave-convex matching limiting portion and a matching portion, the limiting portion is arranged on the outer surface of the shell, and the matching portion is arranged inside the shell.

[0019] Preferably, a mutually cooperating snap-fitting structure is provided between the shell and the arc-extinguishing hood, and the snap-fitting structure comprises a snap-fitting snap-fitting snap-fitting groove and a snap-fitting portion, the snap-fitting groove is provided in the arc-extinguishing hood, and the snap-fitting portion is provided in the shell.

[0020] The present invention further provides an isolating switch, comprising an operating module and a contact module, wherein the contact module comprises at least one contact unit as described above, and an operating mechanism of the operating module drives the at least one contact unit to open and close the switch.

[0021] The contact unit and disconnector of the present invention have a contact mechanism connected to the arc extinguishing system along a first direction, which is beneficial for the arc to flow into the arc extinguishing system. The buffer zone and the arc extinguishing hood are arranged along a second direction, which prolongs the flow path of the arc in the arc extinguishing hood, which is beneficial for improving the arc extinguishing efficiency. At the same time, the buffer zone fully absorbs the exhaust gas generated after the cooling arc is extinguished, which is beneficial for improving the safety of use.

[0022] In addition, the moving contact assembly and the stationary contact assembly are assembled together in the shell, so that the contact mechanism forms a modular structure, which is convenient for assembly. The opening of the shell is connected with the arc entrance port of the arc extinguishing cover, so that the arc generated by the contact mechanism flows in a relatively closed space, thereby improving the efficiency of arc striking and arc extinguishing.

[0023] In addition, the opening limit part of the rotating shaft cooperates with the opening barrier part of the shell, which can not only play a limiting role but also block the two openings of the shell from being connected when opening the switch, so that the accommodating cavity is divided into two relatively independent parts, avoiding the two arc extinguishing systems from affecting each other through the accommodating cavity, and increasing the air tightness and creepage distance.

[0024] In addition, the arc extinguishing system is also provided with a short-circuit plate, which makes the electrical gap between the two grid groups away from the arc entrance end smaller than the minimum physical distance between the two grid groups, thereby improving the utilization rate of the arc extinguishing grids in the grid group.

[0025] In addition, the arc extinguishing system is also provided with magnetic conductive plates, and arc running channels are provided between the magnetic conductive plates, so that the magnetic conductive plates cooperate to form a magnetic field in the arc running channel, which is beneficial to introducing the arc into the grid group and improving the arc extinguishing ability.

[0026] In addition, a plurality of columns are arranged in the buffer zone, and the columns cool and absorb the exhaust gas, so that the exhaust gas is cooled and absorbed in the buffer zone, thereby preventing the exhaust gas from being discharged from the outer shell, thereby improving the safety of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1-2 It is a structural schematic diagram of the contact unit in the present invention;

[0028] Figure 3-4 is an exploded schematic diagram of a contact unit in the present invention;

[0029] Figure 5 It is a schematic diagram of arc flow when the contact mechanism of the present invention is opened;

[0030] Figure 6 It is a schematic diagram of the structure of the contact mechanism and the arc extinguishing chamber in the present invention (when the circuit breaker is closed);

[0031] Figure 7 It is a schematic diagram of the structure of the contact mechanism and the arc extinguishing chamber in the present invention (when the switch is open);

[0032] Figure 8 It is a structural schematic diagram of the contact mechanism in the present invention;

[0033] Figure 9-10 is an exploded schematic diagram of the contact mechanism in the present invention;

[0034] Fig.11 It is a schematic structural diagram of the side of the plate body facing the accommodating cavity in the present invention;

[0035] Fig.12 It is a schematic structural diagram of the side of the plate body facing away from the accommodating cavity in the present invention;

[0036] Figure 13-14 It is a structural schematic diagram of the rotating shaft and the moving contact bridge in the present invention;

[0037] Fig.15 It is a schematic diagram of the structure of the rotating shaft and the moving contact bridge after being decomposed in the present invention;

[0038] Fig.16 It is a schematic diagram of the structure of the contact support facing the cover plate in the present invention;

[0039] Fig.17 It is a schematic diagram of the structure of the contact support facing away from the cover plate in the present invention;

[0040] Fig.18 It is a schematic diagram of the structure of the cover plate facing the contact support side in the present invention;

[0041] Fig.19 It is a schematic diagram of the structure of the cover plate facing away from the contact support side in the present invention;

[0042] Fig. 20 It is a structural schematic diagram of the moving contact bridge in the present invention;

[0043] Fig.21 It is a schematic diagram of the structure of the movable contact piece and the elastic member in the present invention;

[0044] Fig. 22 It is a structural schematic diagram of the moving contact piece in the present invention;

[0045] Fig.23 is a side view of the movable contact piece in the present invention;

[0046] Fig.24 It is a schematic diagram of the structure of the elastic member in the present invention;

[0047] Fig.25 It is a schematic diagram of the structure of the support member in the present invention;

[0048] Figure 26-27 It is a structural schematic diagram of the arc extinguishing chamber in the present invention;

[0049] Figure 28-29 It is a schematic diagram of the structure of the cover body, the grid plate group and the short-circuit plate in the present invention;

[0050] Fig.30 It is a schematic diagram of the structure of the cover body in the present invention;

[0051] Fig.31 It is a schematic diagram of the structure in which the cover body is provided with a grid slot in the present invention;

[0052] Fig.32 It is a structural schematic diagram of the grid plate group in the present invention;

[0053] Fig.33 It is a structural schematic diagram of the short-circuit board in the present invention;

[0054] Fig.34 It is a structural schematic diagram of the magnetic conductive plate in the present invention;

[0055] Fig.35 It is a structural schematic diagram of the housing in the present invention;

[0056] Reference numerals:

[0057] a-contact mechanism, 1-moving contact assembly, 11-rotating shaft, 111-contact support, 1111-radial groove, 112-cover plate, 1121-through hole, 113-rotating part, 114-transmission shaft, 115-opening limit part, 116-clamping groove, 117-transmission groove, 12-moving contact bridge, 120-moving contact part, 1201-clamping gap, 121-moving contact piece, 1210-guide piece, 1211-limiting groove, 1212- Positioning hole, 122-elastic member, 1221-elastic arm, 1222-elastic opening, 123-support member, 1231-body, 1232-convex shaft, 13-clip member, 2-static contact assembly, 21-static contact portion, 22-wiring portion, 3-housing, 301-plate body, 302-support wall, 303-connecting wall, 304-extension portion, 31-assembly groove, 32-disconnection barrier portion, 33-connecting hole, 341-first limiting portion , 342-second limiting portion, 351-buckle, 352-slot, 361-positioning groove, 40-arc extinguishing chamber, 401-arc inlet, 402-arc running channel, 41-grid group, 410-arc extinguishing groove, 411-arc extinguishing grid, 412-arc extinguishing notch, 42-arc extinguishing cover, 421-cover body, 422-butt joint, 423-exhaust hole, 424-grid slot, 4251-magnetic plate mounting slot, 4252-fastening boss, 4 261-first boss, 4262-second boss, 427-clamping groove, 43-magnetic conductive plate, 431-fastening groove, 44-short-circuit plate, 441-pin, 442-arc-starting plate, 45-buffer, 451-column, 5-housing, 511-first matching part, 512-second matching part, 52-baffle, 521-straight section, 522-connecting section, 53-limiting plate, 531-notch, 54-central hole, 55-clamping part. DETAILED DESCRIPTION

[0058] The following is a further description of the specific implementation of the contact unit and the disconnector of the present invention in conjunction with the embodiments given in the accompanying drawings. The contact unit and the disconnector of the present invention are not limited to the description of the following embodiments.

[0059] The isolating switch comprises an operating module and a contact module. The contact module comprises at least one contact unit. Two adjacent contact units are linked and connected. The operating mechanism of the operating module drives at least one contact unit to open and close.

[0060] Each contact unit includes a housing 5, in which a contact mechanism a, two arc extinguishing systems and a pair of wiring assemblies (not shown) are arranged, wherein the contact mechanism a includes a moving contact assembly 1 and a pair of static contact assemblies 2, each static contact assembly 2 is respectively connected to a wiring assembly, the moving contact assembly 1 rotates between the pair of static contact assemblies 2, and is used to connect or disconnect the main line in each contact unit, the moving contact assembly 1 includes a rotating shaft 11 and a pair of moving contact parts 120 arranged in the rotating shaft 11, the rotating shaft 11 is rotatably arranged between the pair of static contact assemblies 2, a moving contact bridge 12 is arranged in the rotating shaft 11, and the two ends of the moving contact bridge 12 serve as moving contact parts 120 respectively, each moving contact part 120 extends radially to the outside of the rotating shaft 11, as the rotating shaft 11 is driven to rotate, each moving contact part 120 is respectively in contact with or separated from a static contact assembly 2; two adjacent contact units are linked and connected through the rotating shaft 11, so as to realize the synchronous opening and closing of the contact mechanism a in all contact units.

[0061] The arc extinguishing system is arranged on one side of the contact mechanism a, and is used to extinguish the arc generated when the contact mechanism a is opened. The arc extinguishing system includes an arc extinguishing hood 42 and a grid group 41 arranged in the arc extinguishing hood 42. The arc generated when the contact mechanism a is disconnected is introduced from the arc entrance port 401 of the arc extinguishing hood 42, and the arc is cut by the grid group 41 to extinguish the arc.

[0062] The improvement of the present application is that the contact mechanism a is arranged between two arc extinguishing systems along the first direction of the housing 5, the arc extinguishing system includes an arc extinguishing chamber 40 and a buffer zone 45, the arc extinguishing chamber 40 includes an arc extinguishing cover 42, one end of the arc extinguishing cover 42 is provided with an arc entry port 401, the arc entry port 401 is connected with the contact mechanism a in the first direction of the housing 5, the buffer zone 45 and the arc extinguishing cover 42 are arranged along the second direction of the housing 5, and the buffer zone 45 is connected with the exhaust hole 423 of the arc extinguishing chamber 40, and the first direction is perpendicular to the second direction. In this way, the contact mechanism a is connected with the arc extinguishing system along the first direction, which is conducive to the arc flowing into the arc extinguishing system, and the buffer zone 45 and the arc extinguishing cover 42 are arranged along the second direction, which prolongs the flow path of the arc in the arc extinguishing cover 42, which is conducive to improving the arc extinguishing efficiency. At the same time, the buffer zone 45 fully absorbs the exhaust gas generated after the cooling arc is extinguished, which is conducive to improving the safety of use.

[0063] Preferably, the contact mechanism a also includes a shell 3, the accommodating cavity of the shell 3 is provided with two opposite openings, the two openings are arranged along the first direction of the shell 5, each opening corresponds to and docks with an arc entry port 401, the moving contact assembly 1 and the static contact portion 21 are assembled in the accommodating cavity, wherein a pair of static contact assemblies 2 are arranged at intervals in the first direction and are offset relative to each other in the second direction, the moving contact assembly 1 is rotatably arranged between a pair of moving contact assemblies 1, and the moving contact assembly 1 and the static contact assembly 2 assembled together in the shell 3 form a modular structure for easy assembly.

[0064] Preferably, both ends of the arc extinguishing hood 42 are open, and the internal space of the arc extinguishing hood 42 forms an arc extinguishing cavity, with one open end of the arc extinguishing hood 42 serving as the arc entrance 401, and the other open end opposite to the arc entrance 401 being closed by the housing 5, preferably assembled in the housing 5, and closed by the inner side wall of the housing 5, of course, the other open end of the arc extinguishing hood 42 may also be closed by a partition plate arranged in the housing 5, thereby forming a relatively closed cavity of the arc extinguishing cavity, of course, the arc extinguishing hood 42 may directly adopt a structure with one end open and the other end closed, wherein the open end of the arc extinguishing hood 42 serves as the arc entrance 401, and the two grid groups 41 are spaced along the second direction. The arc-entry opening 401 is arranged at intervals, and each grid group 41 is arranged on one side of the arc-entry opening 401, so that an arc running channel 402 connected to the arc-entry opening 401 is formed between the two grid groups 41, each grid group 41 includes a plurality of arc-extinguishing grids 411 arranged at intervals in a first direction, an arc-extinguishing gap is formed between two adjacent arc-extinguishing grids 411, and a plurality of exhaust holes 423 arranged along the first direction are provided on the side wall of the arc-extinguishing cover 42 adjacent to the arc-entry opening 401, and the exhaust holes 423 are connected to the arc-extinguishing gap. When the arc-entry opening 401 is docked with the open opening of the shell 3, the arc-extinguishing cavity is docked with the accommodating cavity of the shell 3 to form a relatively closed space, thereby improving the efficiency of arc striking and arc extinguishing.

[0065] Furthermore, each arc extinguishing system further includes a short-circuit plate 44 and / or at least two magnetic conductive plates 43, wherein the short-circuit plate 44 is disposed at one end of the arc running channel 402 away from the arc entrance 401, and the short-circuit plate 44 makes the electrical gap between the two grid plate groups 41 away from the arc entrance 401 smaller than the minimum physical distance between the two grid plate groups 41, that is, the distance between the end of each grid plate group 41 away from the arc entrance and a pin 441 of the short-circuit plate 44 is smaller than the minimum physical interval between the two grid plate groups 41, and the ends of the two grid plate groups 41 away from the arc entrance 401 are short-circuited at the same potential by the short-circuit plate 44, so that the arc current needs to break through the arc extinguishing grid 411 of each grid plate group 41 to form a current loop, thereby improving the utilization rate of the arc extinguishing grid 411 in each grid plate group 41. Of course, using other methods to short-circuit the ends of the two grid plate groups 41 away from the arc entrance 401 at the same potential can also improve the utilization rate of the arc extinguishing grid 411.

[0066] Preferably, the number of the magnetic conductive plates 43 is at least two, and the magnetic conductive plates 43 are arranged in pairs and spaced apart in the third direction, so that the arc running channel 402 is located between at least two magnetic conductive plates 43. When the magnetic conductive plates 43 are magnetized, the magnetic conductive plates 43 form a magnetic field corresponding to the arc running channel 402. The direction of the magnetic field is preferably perpendicular to the connection line of the two grid groups 41, so that the arc entering the arc running channel 402 is introduced into the grid group 41 under the action of the magnetic field, thereby improving the arc extinguishing ability. Preferably, the magnetic conductive plates 43 are arranged on the outer surface of the side wall of the arc extinguishing cover 42, that is, the magnetic conductive plates 43 are located outside the arc extinguishing cavity, which is conducive to the flow of the arc in the arc extinguishing cavity and prevents the magnetic conductive plates 43 from short-circuiting with the arc. Of course, the magnetic conductive plates 43 can also be embedded in the side wall of the arc extinguishing cover 42, but the assembly is more complicated, or the magnetic conductive plates 43 are arranged on the inner surface of the side wall of the arc extinguishing cover 42, that is, the magnetic conductive plates 43 are located in the arc extinguishing cavity, but it is easy to cause arc stagnation.

[0067] In addition, the buffer zone 45 is provided with a plurality of columns 451 along the third direction of the outer shell 5, and the columns 451 are opposite to the exhaust hole 423 in the second direction. The high-temperature exhaust gas discharged from the exhaust hole 423 does not need to be discharged from the outer shell 5 after being buffered by the plurality of columns 451, thereby avoiding the discharge of high-temperature gas affecting its safety of use.

[0068] Combination Figure 1-35 A first embodiment of a contact unit is provided, the contact unit comprising a housing 5, Figure 5 For example, the length direction of the shell 5 is the first direction, the width direction of the shell 5 is the second direction, and the thickness direction of the shell 5 is the third direction. The first direction, the second direction and the third direction are perpendicular to each other.

[0069] like Figure 1-7 As shown, a contact mechanism a is provided in the middle of the shell 5, and an arc extinguishing system is respectively provided on both sides of the contact mechanism a along the first direction of the shell 5, and the two arc extinguishing systems form a rotationally symmetrical structure about the contact mechanism a, wherein the contact mechanism a includes a shell 3, and the accommodating cavity of the shell 3 is provided with two openings, and the two openings are spaced opposite to each other in the first direction, and each arc extinguishing system includes an arc extinguishing cover 42, and the two ends of the arc extinguishing cover 42 are open, so that an arc extinguishing cavity connected along the first direction is formed inside the arc extinguishing cover 42, and an open end of each arc extinguishing cover 42 serves as an arc entrance port 401, and each arc entrance port 401 is respectively connected to an opening of the shell 3 along the first direction, so that the arc extinguishing cavity and the accommodating cavity are connected together in an approximately sealed manner, and the other open end away from the arc entrance port 401 is tightly attached to the inner wall of the shell 5, and is closed by the inner wall of the shell 5 or a partition plate arranged in the shell 5, so that the end of the arc extinguishing cavity away from the arc entrance port 401 is closed.

[0070] like Figure 6-10, as shown in FIGS. 20-23, the moving contact assembly 1 includes a rotating shaft 11 and a moving contact bridge 12. The rotating shaft 11 is rotatably supported in the accommodating cavity between two openings. The central axis of the rotating shaft 11 is parallel to the third direction of the housing 5. The moving contact bridge 12 is arranged radially along the rotating shaft 11 inside the rotating shaft 11. The two ends of the moving contact bridge 12 respectively serve as moving contact portions 120 and extend radially along the rotating shaft 11 to the outside of the rotating shaft 11. In this embodiment, each moving contact portion 120 corresponds to one opening respectively. That is, when the moving contact assembly 1 rotates for opening and closing, each moving contact portion 120 moves from one side of an opening to the other side of the same opening. During this process, a partial area of the moving contact portion 120 can extend out of the opening, or it can be understood that a part of the moving contact portion 120 can move inside the incoming arc opening 401.

[0071] Specifically, as Figure 8-10 shown, the two pairs of side walls of the housing 3 connected between the two openings are respectively a pair of support walls 302 and a pair of connection walls 303. Each connection wall 303 is adjacent to a support wall 302. A communication hole 33 is formed in the middle of a pair of support walls 302. The rotating shaft 11 is rotatably supported between a pair of connection walls 303, and each communication hole 33 is coaxial with the rotating shaft 11, so that the output shaft of the operating mechanism or the transmission shaft 114 of two adjacent contact units can drive the rotating shaft 11 to rotate along the third direction of the housing 5 through the communication hole 33. A first limiting portion 341 is protrudingly arranged on the outer surface of the support wall 302. In this embodiment, as Figure 8-10 , 12 shown, the first limiting portion 341 is an annular boss surrounding the communication hole 33; a second limiting portion 342 is arranged on the outer surface of the connection wall 303, Fig.12 and in

[0072] this embodiment, as Figure 8-12 shown, the housing 3 includes two plate bodies 301 spaced relatively in the third direction. The shapes of the two plate bodies 301 can be the same or different, but the two plate bodies 301 enclose a hollow cavity with two open ends, and the hollow cavity is a "□"-shaped cavity as a whole. The hollow part of the hollow cavity serves as the accommodating cavity. Among them, the two plate bodies 301 can be respectively in the shapes of "-" and "凵" to cooperate to form, or can be enclosed by two "凵"-shaped plate bodies 301, or both of the two plate bodies 301 are in the shape of "∟". It should be noted that when the housing 3 includes two housings 3, the two housings 3 can also be spaced relatively in the second direction.

[0073] As Figure 10-12As shown, in this embodiment, it is preferred that each plate body 301 is integrally in a rectangular plate structure. On both sides of the plate surface of each plate body 301, there are extension parts 304 protruding along the third direction, so that each plate body 301 presents a "U" shape. A pair of connecting walls 303 of the housing 3 are formed by the cooperation of the extension parts 304 on the same side of the two plate bodies 301. The two extension parts 304 can be overlapped or butted to form the connecting wall 303. The middle parts of the two plate bodies 301 are spaced opposite to form a pair of support walls 302 of the housing 3.

[0074] Furthermore, as Fig.10 , 11 shown, there is a splicing structure that cooperates with each other between the two plate bodies 301. The splicing structure includes at least a pair of cooperating buckles 351 and clamping grooves 352. One of the plate bodies 301 is provided with clamping grooves 352 and / or buckles 351, and the other plate body 301 is provided with buckles 351 and / or clamping grooves 352. In this embodiment, clamping grooves 352 are opened in the middle of the two extension parts 304 of one of the plate bodies 301, and buckles 351 are protruding in the middle of the two extension parts 304 of the other plate body 301. When the two extension parts 304 are butted to form the connecting wall 303, the buckles 351 cooperate with the clamping grooves 352 to form a pluggable and detachable structure, which is convenient for assembling the rotating shaft 11 in the accommodation cavity.

[0075] As Figure 5 , 10 and 11 shown, a groove structure serving as the switching-off barrier part 32 is opened at the edge of each extension part 304. Each groove structure is an arc-shaped groove and its opening is inclined towards the open end of the housing 3, so that the edge of each extension part 304 forms an "S" shape. The center line of each groove structure coincides with part of the movement track of the switching-off limiting part 115. In this embodiment, the two switching-off barrier parts 32 form a rotationally symmetric structure about the central axis of the communication hole 33.

[0076] Preferably, an assembly groove 31 is opened in each connecting wall 303. The central axis of the assembly groove 31 is parallel to the second direction. Each static contact assembly 2 cooperates with the moving contact assembly 1 through the assembly groove 31, and the two assembly grooves 31 form a rotationally symmetric structure about the central axis of the communication hole 33. In this embodiment, a groove structure is opened at the end face edge of each extension part 304. When the two extension parts 304 are butted, the two groove structures cooperate to form the assembly groove 31. Each assembly groove 31 is located in the middle of the connecting wall 303. There is an assembly groove 31 and a switching-off barrier part 32 in the same connecting wall 303. That is, a static contact part 21 and a switching-off barrier part 32 are respectively located on the connecting walls 303 on both sides of the same open end of the housing 3. The static contact assembly 2 can be clamped when the two extension parts 304 are butted, thereby realizing the stable cooperation between the static contact assembly 2 and the housing 3.

[0077] Of course, the housing 3 may not be provided with the assembly groove 31 , and the static contact assembly 2 extends from the opening of the housing 3 to the inside of the housing 3 to cooperate with the moving contact assembly 1 , but this may affect the sealing performance of the housing 3 and the arc extinguishing cover 42 .

[0078] Furthermore, at least one set of positioning structures may be provided between the two plates 301, wherein the positioning structures include positioning bosses (not shown) and positioning grooves 361 (see Fig.11 ), one of the plates 301 is provided with a positioning boss and / or a positioning groove 361, and the other plate 301 is provided with a positioning groove 361 and / or a positioning boss. In this embodiment, the two extensions 304 of one of the plates 301 are respectively provided with a positioning groove 361, and the two positioning grooves 361 form a rotationally symmetrical structure about the central axis of the communicating hole 33, that is, Fig.11 The two positioning grooves 361 are respectively located at the corners of the same plate body 301 , and a positioning boss is respectively provided on the two extension portions 304 of the two plate bodies 301 . Each positioning boss cooperates with a positioning groove 361 for positioning, which facilitates assembly.

[0079] In addition, the two extension portions 304 can be fixedly connected together, for example, by means of screws or bonding by processes such as heat riveting, ultrasonic riveting, etc. At this time, the two extension portions 304 can be either end-to-end or side-to-side. This can ensure the stability of the shell 3, but it is inconvenient to disassemble and assemble. In this case, an assembly groove 31 needs to be opened in the connecting wall 303.

[0080] Of course, the housing 3 may also be an integrally formed structure (see Figure 8 ), in this case, the connecting wall 303 is an integral structure, and an assembly groove 31 is directly opened in the middle of the connecting wall 303, and a gate-isolating portion 32 is set at the same position in the accommodating cavity.

[0081] like Figure 8-10As shown in 13-15, in this embodiment, the axial height of the rotating shaft 11 is greater than or equal to the interval between the pair of supporting walls 302, that is, the height of the rotating shaft 11 in the third direction is greater than or equal to the interval between the pair of supporting walls 302 in the third direction, and the circumferential side wall of the rotating shaft 11 is protruded to set two gate-breaking limit parts 115, and the two openings of the accommodating chamber are blocked by the rotating shaft 11 and the two gate-breaking limit parts 115 to communicate with each other. Preferably, the two ends of the rotating shaft 11 are respectively rotatably abutted against the supporting walls 302, that is, the rotating surfaces of the rotating shaft 11 are respectively rotatably abutted against the supporting walls 302, thereby closing the gap between the communicating hole 33 and the rotating shaft 11. When rotating to the gate-breaking position, the two gate-breaking limit parts 115 abut against the accommodating chamber (the inner wall of the housing 3). In order to block the two openings from being connected to each other, further, a gate-breaking barrier part 32 is arranged in the accommodating chamber, and the two gate-breaking barrier parts 32 are arranged at intervals in the first direction and are offset relative to each other in the second direction. The gate-breaking barrier part 32 is located on the moving trajectory of the gate-breaking limit part 115. When the rotating shaft 11 rotates to the gate-breaking position, the gate-breaking limit part 115 cooperates with the gate-breaking barrier part 32 to limit the further rotation of the rotating shaft 11, wherein the thickness of the gate-breaking limit part 115 and / or the gate-breaking barrier part 32, or the overall thickness after the gate-breaking limit part 115 and the gate-breaking barrier part 32 are coordinated is equal to the distance between a pair of support walls 302, thereby achieving the goal of blocking the two openings of the accommodating chamber from being connected to each other, thereby having the effect of airtight guidance and increasing the creepage distance.

[0082] Of course, when the gate opening limit portion 115 is not used to block the two openings of the shell 3 from being connected, the gate opening limit portion 115 can also be set at other positions of the rotating shaft 11. For example, the gate opening limit portion 115 is set on the rotating surface of the rotating shaft 11. At this time, the gate opening barrier portion 32 is an arc-shaped trajectory groove provided on the support wall 302, and the opening of the arc-shaped trajectory groove faces the gate opening limit portion 115. After the rotating shaft 11 rotates to the gate opening position, the gate opening limit portion 115 abuts against the closed end of the arc-shaped trajectory groove.

[0083] like Figure 5-7 As shown in FIGS. 13-15 , the rotating shaft 11 is cylindrical as a whole, and the two moving contact portions 120 extend to the outside of the rotating shaft 11 along the radial direction of the rotating shaft 11, and a gate-opening limiting portion 115 is protrudingly provided on the circumferential side wall of the rotating shaft 11. Fig.10 , 14In the embodiment of the invention, there are two opening gate limiting parts 115, and the two opening gate limiting parts 115 form a rotationally symmetrical structure about the axis of the rotating shaft 11, and each opening gate limiting part 115 is adjacent to a moving contact part 120, so as to avoid a large gap between the opening gate limiting part 115 and the moving contact part 120 to limit the rotation angle of the rotating shaft 11. As the rotating shaft 11 rotates in the housing 3, each moving contact part 120 and the opening gate limiting part 32 adjacent to the moving contact part 120 move together between the static contact part 21 and the opening gate blocking part 32 on both sides of the same opening, and the opening gate limiting part 115 is located on the side of the moving contact part 120 facing away from the static contact part 21.

[0084] Combination Fig.10 , 13 -19 provides a specific structure of a split shaft 11, the shaft 11 includes a contact support 111 and a cover plate 112 covering the contact support 111.

[0085] like Figure 14-17 As shown, the contact support 111 is cylindrical as a whole, and a radial groove 1111 is provided on one side surface of the contact support 111, and both ends of the radial groove 1111 are open. The moving contact bridge 12 is assembled in the radial groove 1111, and both ends of the moving contact bridge 12 extend out of the contact support 111 to form two moving contact parts 120. Two transmission shafts 114 are protruded on both sides of the radial groove 1111, and the transmission shaft 114 can also provide a certain limit effect for the moving contact bridge 12; two driving shafts 114 are protruded on the circumferential side wall of the contact support 111. The two bosses are the bosses of the opening limiter 115, and the two bosses form a rotationally symmetrical structure about the axis of the contact support 111, and each boss is located on the side close to the opening of the radial groove 1111; a rotating part 113 is protrudingly provided on the other side surface of the contact support 111, and the rotating part 113 is located at the center of the contact support 111. The rotating part 113 is rotatably matched with a connecting hole 33 of a support wall 302, and a transmission groove 117 is respectively provided on both sides of the rotating part 113, and each transmission groove 117 is coaxial with the transmission shaft 114. It should be noted that the transmission shaft 114 can also be assembled on the contact support 111 alone, and the transmission shaft 114 can also be arranged in pairs, but the transmission shaft 114 is preferably located at a position deviating from the axis of the contact support 111, and the multiple transmission shafts 114 preferably form a rotationally symmetrical structure about the axis of the contact support 111.

[0086] like Fig.10 , 18As shown in Figure 19, the cover plate 112 is disc-shaped as a whole, and two through holes 1121 are provided in the middle of the cover plate 112. Each through hole 1121 is coaxial with the transmission shaft 114 of the contact support 111. When the cover plate 112 is covered on the contact support 111, each transmission shaft 114 passes through a corresponding through hole 1121 and then passes through the connecting hole 33 of a support wall 302 to the outside of the housing 3, and is used to be plugged into the transmission groove 117 of the adjacent moving contact assembly 1. The transmission shaft 114 is located at a position deviating from the axial center of the rotating shaft 11, which is conducive to providing a stable linkage connection; two bosses as the opening limit portion 115 are protruding from the edge of the cover plate 112, and each boss located on the cover plate 112 corresponds one-to-one with the boss located on the contact support 111; of course, it is also possible to set a boss as the opening limit portion 115 only on the cover plate 112 or the contact support 111.

[0087] like Fig.10 , 15 As shown, the contact support 111 and the cover plate 112 of this embodiment are connected together by at least one snap member 13, that is, a snap groove 116 is respectively provided on the edge of one side of the contact support 111 facing away from the cover plate 112 and the edge of one side of the cover plate 112 facing away from the contact support 111. When the cover plate 112 covers the contact support 111, the snap groove 116 on the same side of the cover plate 112 and the contact support 111 corresponds to each other and then snaps into one snap member 13, thereby securing the contact support 111. The contact support 111 is connected with the cover plate 112. In the present embodiment, the cover plate 112 and the contact support 111 are connected with each other through two snap members 13. The two snap members 13 are symmetrically arranged on opposite sides of the rotating shaft 11, and the center line of the two snap members 13 is perpendicular to the center axis of the moving contact bridge 12. That is, the snap members 13, the snap groove 116 and the transmission shaft 114 are located on the same diameter of the rotating shaft 11, and the diameter is perpendicular to the axis of the moving contact bridge 12.

[0088] In addition, the snap member 13 can be an integral structure with the cover plate 112 or the contact support 111. For example, the snap member 13 and the cover plate 112 are an integral structure, and the snap groove 116 is only provided at the edge of the contact support 111. Alternatively, the snap member 13 and the contact support 111 are an integral structure, and the snap groove 116 is only provided at the edge of the cover plate 112. It should be noted that the cover plate 112 and the contact support 111 can also be connected in other ways that are convenient for disassembly; in addition, the contact support 111 and the cover plate 112 can also be fixed by riveting, or welded by hot melting, ultrasonic welding or other processes.

[0089] A specific structure of an integrated rotating shaft 11 (not shown) is provided. The rotating shaft 11 includes a cylindrical rotating body. A radial groove 1111 for assembling a moving contact bridge 12 is provided inside the rotating body. Both ends of the radial groove 1111 penetrate the circumferential side wall of the rotating body, so that the two moving contact portions 120 of the moving contact can extend from the opening of the radial groove 1111 to the outside of the rotating body. A gate-breaking barrier portion 32 is protruded from the circumferential side wall of the rotating body. Each gate-breaking barrier portion 32 is adjacent to a moving contact portion 120. At the center position of one side of the rotating body, a gate-breaking barrier portion 32 is provided. A rotating portion 113 is protruded from the housing 3, and the rotating portion 113 is rotatably matched with the connecting hole 33 of the housing 3. The rotating portion 113 is provided with at least one transmission groove 117, and the transmission groove 117 is located at a position deviating from the axis center, and is used for plugging with the transmission shaft 114 of the adjacent moving contact assembly 1; at least one transmission shaft 114 is protruded from the other side of the rotating body, and the transmission shaft 114 is located at a position deviating from the axis center of the rotating body. Preferably, the number of the transmission shafts 114 is two, and the two transmission shafts 114 form a rotationally symmetrical structure about the axis center of the rotating shaft 11.

[0090] The moving contact bridge 12 assembled in the rotating shaft 11 can adopt the existing technology, that is, the moving contact bridge 12 includes two parallel and opposite moving contact pieces 121, and the same end of the two moving contact pieces 121 corresponds to forming a moving contact portion 120 with a clamping gap 1201. Each moving contact piece 121 has a certain elasticity and can provide a clamping force for the clamping gap 1201. Each moving contact portion 120 extends to the outside of the rotating shaft 11 along the radial direction of the rotating shaft 11. As the rotating shaft 11 is driven to rotate, each moving contact portion 120 is respectively in contact with or separated from the static contact portion 21 of a static contact assembly 2.

[0091] Preferably, Fig.15 , 20 -25, the dynamic contact bridge 12 of this embodiment also includes at least one elastic member 122, and the elastic member 122 is arranged on one side of a dynamic contact portion 120. The elastic member 122 provides additional clamping force for the clamping gap 1201. By changing the applied force torque, the pressure of the clamping gap 1201 can be adjusted, so that the clamping gap 1201 has a stable clamping force, thereby ensuring the matching stability between the dynamic contact portion 120 and the static contact portion 21.

[0092] Preferably, there are at least two elastic members 122, and at least one elastic member 122 is provided on one side of each moving contact portion 120. Preferably, the elastic members 122 are provided in pairs, that is, the same number of elastic members 122 are provided on one side of each moving contact portion 120, which is beneficial to provide a stable additional clamping force for each moving contact portion 120. Of course, there can also be one elastic member 122. In this case, the elastic member 122 needs to be provided in the middle. In order to ensure that additional clamping force is provided for the two moving contact portions 120 at the same time, its size may be larger; or, different numbers of elastic members 122 are provided on one side of the two moving contact portions 120. In order to ensure that the clamping force of the two moving contact portions 120 is the same, it is possible to reduce the number of elastic members 122 used by increasing the size of the elastic members 122 or moving the assembly position.

[0093] Preferably, the elastic member 122 is sleeved outside the two moving contact pieces 121, so that the elastic member 122 and the moving contact piece 121 form a stable clamping relationship, which is convenient for disassembly and assembly and can ensure that a stable clamping force is provided for the clamping gap 1201. Further, as Fig. 20 , 21 As shown in 24, the elastic member 122 sleeved outside the two moving contact pieces 121 is provided with an elastic opening 1222. At this time, the elastic member 122 is in a U-shaped structure as a whole, and the gap of the elastic opening 1222 is less than or equal to the clamping gap 1201. When the static contact part 21 is inserted into the clamping gap 1201, the elastic opening 1222 becomes larger, causing the elastic member 122 to elastically deform, and the elastic member 122 provides reverse pressure to the moving contact piece 121 to ensure the contact pressure between the moving contact part 120 and the static contact part 21, that is, to ensure the contact resistance and ensure reliable contact. Of course, the elastic member 122 can also be a closed annular structure, for example, a rubber member forms an "○" structure, or a spring wire or a reed is bent into a "□" shape.

[0094] Combination Fig.15 , 20 -25 and provide an embodiment of a moving contact bridge 12.

[0095] As shown in the figure, the moving contact bridge 12 includes two moving contact pieces 121, two elastic members 122 and a support member 123. The two moving contact pieces 121 are parallel and spaced opposite to each other. The center positions of the two moving contact pieces 121 are connected together through the support member 123. The same end of the two moving contact pieces 121 cooperates to form a moving contact portion 120 with a clamping gap 1201. An elastic member 122 is arranged between each moving contact portion 120 and the support member 123. In this embodiment, the elastic member 122 is preferably a U-shaped structure. In addition, more than one elastic member 122 can be arranged between each moving contact portion 120 and the support member 123 according to actual needs.

[0096] Furthermore, the moving contact piece 121 is also provided with a limiting groove 1211 for limiting the elastic member 122, and the central axis of the limiting groove 1211 is perpendicular to the central axis of the moving contact piece 121 to prevent the elastic member 122 from shifting during the deformation process. Preferably, the limiting groove 1211 is opened at two side positions of the moving contact piece 121 to avoid setting too many structures on the moving contact piece 121, which is not conducive to ensuring stability; preferably, the number of limiting grooves 1211 is multiple, and at least one spare limiting groove is reserved among the multiple limiting grooves 1211, that is, the number of limiting grooves 1211 is greater than the number of elastic members 122, so that the elastic member 122 has multiple adjustable assembly positions, which is conducive to adjusting the additional clamping force provided by the elastic member 122 for the clamping gap. Of course, the number of limiting grooves 1211 can also be equal to the number of elastic members 122, but their assembly positions cannot be adjusted.

[0097] like Figure 20-23 As shown, the movable contact piece 121 of this embodiment includes a contact piece body, which is a strip-shaped plate-shaped conductor. A positioning hole 1212 is opened in the middle of the contact piece body. The sides of both ends of the contact piece body extend outward to form a guide piece 1210. The two guide pieces 1210 of each contact piece body form a rotationally symmetrical structure about the positioning hole 1212. Figure 20-22 In the embodiment, two guide pieces 1210 of the same contact body extend in opposite directions respectively, and the same ends of the two moving contact pieces 121 are spaced relative to each other to form a moving contact portion 120. At this time, the gap between the two moving contact pieces 121 corresponding to the part of the moving contact portion 120 is a clamping gap 1201. The same side of the same moving contact portion 120 has two spaced relative guide pieces 1210, and the guide pieces 1210 provide a guiding effect for the static contact assembly, so that the static contact portion 21 of the static contact assembly 2 enters the clamping gap 1201 from the guide pieces 1210; a limiting groove 1211 is provided on the contact body between each guide piece 1210 and the positioning hole 1212. Preferably, the number of the limiting grooves 1211 is greater than the number of the elastic members 122, and the redundant limiting grooves 1211 are used as spare limiting grooves to facilitate the adjustment of the assembly position of the elastic member 122. Fig.21 , 22 In the figure, a pair of limiting grooves 1211 are respectively provided on the two side edges of the contact body between each guide piece 1210 and the positioning hole 1212, and the two pairs of limiting grooves 1211 of the same contact body form a rotationally symmetrical structure about the positioning hole 1212, and the central axis of each limiting groove 1211 is perpendicular to the central axis of the contact body.

[0098] like Fig. 20 , 21As shown in Figure 24, the elastic member 122 of this embodiment is a U-shaped structure with an elastic opening 1222. Specifically, the elastic member 122 includes two elastic arms 1221 that are spaced apart and opposite to each other. One end of the two elastic arms 1221 is bent toward each other and connected together to form an integrated structure and inserted into the limiting groove 1211 on one side edge of the contact body. The other ends of the two elastic arms 1221 are bent toward each other and spaced apart to form an elastic opening 1222, wherein the gap of the elastic opening 1222 is less than or equal to the gap between the two moving contact pieces 121, and the ends of the two elastic arms 1221 that form the elastic opening 1222 are respectively corresponding to the contact body. In the limiting groove 1211 on the edge of the other side of the body, in the present embodiment, the elastic arm 1221 of the elastic member 122 is perpendicular to the central axis of the contact body, and the elastic opening 1222 and the adjacent guide piece 1210 are located on the same side of the moving contact bridge 12. When the static contact portion 21 enters the clamping gap 1201, the static contact portion 21 can correspondingly expand the elastic opening 1222, thereby causing the elastic member 122 to undergo elastic deformation, so that the degrees of freedom of the two moving contact pieces 121 can be adaptively adjusted, thereby reducing the risk of poor closing due to collision caused by the dynamic contact portion 120 and the static contact portion 21 not being centered due to component manufacturing errors.

[0099] like Fig.25 As shown, the support member 123 is supported between the two moving contact pieces 121 to connect the two moving contact pieces 121 as a whole. At the same time, the height of the support member 123 can also be used to control the interval between the two moving contact pieces 121, and to a certain extent, the clamping gap 1201 of the two moving contact parts 120 can be controlled. In this embodiment, the support member 123 includes a body 1231, and the body 1231 is cylindrical in the figure. Convex shafts 1232 are protruded at opposite ends of the body 1231, and each convex shaft 1232 is correspondingly plugged into a positioning hole 1212 of a moving contact piece 121. The interval between the two moving contact pieces 121, that is, the clamping gap 1201 of each moving contact part 120, is limited by the axial height of the body 1231.

[0100] It should be noted that when the moving contact assembly 1 and the static contact assembly 2 are arranged in the shell 3, the transmission shaft 114 and the rotating part 113 of the rotating shaft 11 respectively rotate along the third direction through a connecting hole 33 of the shell 3, and the two moving contact pieces 121 of the moving contact bridge 12 are spaced opposite to each other in the third direction.

[0101] The stationary contact assembly 2 matched with the moving contact assembly 1 can adopt the existing technology. In this embodiment, preferably, as Figure 1 , 2As shown in 4-10, the static contact assembly 2 includes a conductive plate, each conductive plate corresponding to an assembly groove 31. When the shell 3 is spliced ​​by two plate bodies 301, each conductive plate is preferably clamped under the action of the two plate bodies 301. A static contact portion 21 is provided at one end of the conductive plate, and the static contact portion 21 extends into the accommodating cavity for cooperating with the dynamic contact portion 120. The two static contact portions 21 are arranged at intervals in the accommodating cavity and form a rotationally symmetrical structure about the axis of the rotating shaft 11 (connecting hole 33). A wiring portion 22 is provided at the other end of the conductive plate. Each wiring portion 22 is located outside the shell 3 for connecting to the wiring assembly. When the dynamic contact assembly 1 of this embodiment is matched with the static contact assembly 2, the elastic opening 1222 of the elastic member 122 preferably faces the static contact portion 21.

[0102] like Figure 1-7 As shown, the arc extinguishing system is arranged on one side of the contact mechanism a along the first direction of the housing 5 to extinguish the arc generated when the contact mechanism a is opened. The arc entry port 401 of the arc extinguishing system is connected to the contact mechanism a. The arc extinguishing system includes an arc extinguishing cover 42 and two grid groups 41 spaced opposite to each other in the second direction. An arc entry port 401 connected to the contact mechanism a is opened at one end of the arc extinguishing cover 42. Each grid group 41 is arranged in the arc extinguishing cover 42 on one side of the arc entry port 401, and an arc running channel 402 connected to the arc entry port 401 is formed between the two grid groups 41.

[0103] In this embodiment, it is preferred that one end of the two grid groups 41 away from the arc entrance 401 is short-circuited at the same potential. In this way, when the arc current wants to form a loop, all the arc-extinguishing grids 411 of each grid group 41 must be broken down. The two grid groups 41 jointly limit the current, so that the arc-extinguishing grids 411 are fully utilized, thereby improving the arc-extinguishing capacity of the arc-extinguishing system.

[0104] Furthermore, the arc extinguishing system further includes a short-circuit plate 44 (see Figure 6 , 9 , 28 and 29) or a connecting grid group, a short-circuit plate 44 or a connecting grid group is arranged in the arc running channel 402, so that the two grid groups 41 are short-circuited at one end away from the arc inlet 401 through the short-circuit plate 44 or the connecting grid group to achieve equipotential short-circuiting, wherein the short-circuit plate 44 is relatively small in size and is suitable for contact units with small internal space, and the connecting grid group occupies more space, but at the same time has the function of cutting the arc, and the arc extinguishing effect is better. In addition, the short-circuit plate 44 or the connecting grid group may not be arranged, and the equipotential short-circuiting may be achieved directly by the two grid groups at one end away from the arc inlet 401, which is also applicable.

[0105] Further, such as Fig.26 , 27As shown, the arc extinguishing system further includes at least two magnetic conductive plates 43, preferably, the magnetic conductive plates 43 are stacked on the side wall of the arc extinguishing cover 42 along the third direction, so that the arc running channel 402 is located between at least two magnetic conductive plates 43 in the third direction, and when the magnetic conductive plates 43 are magnetized, a magnetic field can be formed in the arc running channel 402. In this way, two grid groups 41 are arranged in the relatively closed arc extinguishing cover 42, and the magnetic conductive plates 43 form a magnetic field in the arc running channel 402, which is conducive to blowing the arc to the grid group 41. The relatively closed arc extinguishing cover 42 can prolong the coordination time between the arc and the grid group 41, thereby improving its arc extinguishing effect.

[0106] Preferably, each magnetic conductive plate 43 is arranged on the side wall of the arc extinguishing cover 42 along one side of the arc running channel 402, and the width of each magnetic conductive plate 43 is equal to the spacing between the two grid groups 41 in the second direction. The magnetic conductive plate 43 can be embedded in the side wall of the arc extinguishing cover 42, or can be arranged on the inner surface or outer surface of the side wall of the arc extinguishing cover 42. The magnetic plate 43 with a smaller volume is conducive to reducing costs. Of course, when the size of the magnetic conductive plate 43 is large, it is preferred to arrange the magnetic conductive plate 43 on the outer surface of the side wall of the arc extinguishing cover 42 to facilitate the movement of the arc in the arc extinguishing cavity.

[0107] In addition, two grid sets 41 can be assembled together in an arc extinguishing cover 42 to form an arc extinguishing chamber 40, or two grid sets 41 can be assembled in two arc extinguishing covers 42 respectively to form two independent arc extinguishing chambers 40, which can meet the needs of products with different requirements.

[0108] Combination Figure 5-7 and 26-34 provide a first embodiment of the arc extinguishing system.

[0109] like Figure 5-7As shown in , 26-34, the arc extinguishing system includes an arc extinguishing cover 42, two grid groups 41, a short-circuit plate 44 and a pair of magnetic conductive plates 43. An arc entry port 401 is provided at one end of the arc extinguishing cover 42 for cooperating with the contact mechanism a to introduce the arc into the arc extinguishing system. The two grid groups 41 are spaced opposite to each other in the second direction and are respectively arranged on one side of the arc entry port 401. The interval between the two grid groups 41 is connected to the arc entry port 401 as an arc running channel 402. The short-circuit plate 44 is arranged at one end of the arc running channel 402 away from the arc entry port 401. The short-circuit plate 44 connects the ends of the two grid groups 41 away from the arc entry port 401 to the same potential. The magnetic conductive plates 43 are arranged at intervals in the third direction so that the arc running channel 402 is located between a pair of magnetic conductive plates 43. After being magnetized, the pair of magnetic conductive plates 43 generate a magnetic field in the arc running channel 402. Specifically, each magnetic conductive plate 43 is arranged on the side wall of the arc extinguishing cover 42 corresponding to the arc running channel 402, and the width of each magnetic conductive plate 43 is close to the spacing between the two grid groups 41. Preferably, the width of each magnetic conductive plate 43 is equal to the spacing between the two grid groups 41. The magnetic conductive plates 43 can be selectively embedded in the side wall of the arc extinguishing cover 42. Preferably, the magnetic conductive plates 43 are arranged in a close relationship with the outer wall of the arc extinguishing cover 42 along the third direction for easy disassembly and assembly.

[0110] like Figure 26-31 As shown, the arc extinguishing cover 42 includes two cover bodies 421 spaced apart from each other in the third direction, and the two cover bodies 421 surround and form a hollow cavity with two ends open. Fig.26 , 27 In the figure, the arc extinguishing hood 42 is in the shape of "□" as a whole. At this time, an arc extinguishing cavity with two open ends is formed inside the arc extinguishing hood 42. One open end of the arc extinguishing cavity serves as the arc entrance port 401. A plurality of exhaust holes 423 are provided on the side wall of the arc extinguishing hood 42 adjacent to the arc entrance port 401. The plurality of exhaust holes 423 are arranged at intervals along the first direction, and the other open end is closed. That is, when the arc extinguishing system is arranged in the outer shell 5, the other open end is fitted with the inner wall of the outer shell 5 or the partition plate arranged in the outer shell 5, thereby closing the other open end of the arc extinguishing hood 42 to form a relatively closed arc extinguishing cavity.

[0111] like Fig.28 , 29As shown in FIGS. 31 and 32, two grid sheet groups 41 are provided in the arc extinguishing cover 42. Each grid sheet group 41 includes a plurality of arc extinguishing grid sheets 411 arranged at intervals in the first direction. An arc extinguishing gap is formed between two adjacent arc extinguishing grid sheets 411. At least part of the arc extinguishing gap is correspondingly communicated with the exhaust hole 423. An arc extinguishing notch 412 is formed at one end of each arc extinguishing grid sheet 411. The arc extinguishing notches 412 of the same grid sheet group 41 are communicated in the first direction to form an arc extinguishing groove 410. The arc extinguishing groove 410 faces the arc running channel 402, and one end of the arc extinguishing groove 410 is communicated with the arc inlet 401. The arc extinguishing grooves 410 of the two grid sheet groups 41 are oppositely arranged at intervals. In this embodiment, each arc extinguishing notch 412 extends along a direction deviating from the axis away from the opening direction, so that the whole arc extinguishing notch 412 is in a "y" shape. The extending parts 304 of two adjacent arc extinguishing notches 412 are arranged in a staggered manner, which is beneficial to improving the cutting of the arc by the arc extinguishing grid sheets 411. Of course, each grid sheet group 41 can adopt the prior art.

[0112] Two installation areas are provided in the arc extinguishing chamber. The two installation areas are oppositely arranged at intervals. Each installation area correspondingly assembles a grid sheet group 41. Preferably, each installation area includes a plurality of grid sheet slots 424 arranged at intervals. The grid sheet slots 424 and the exhaust holes 423 are respectively located on the adjacent side walls of the arc extinguishing cover 42. One arc extinguishing grid sheet 411 is correspondingly inserted into each grid sheet slot 424.

[0113] In this embodiment, as Figure 26-28 shown, docking parts 422 are provided at both side edges of each cover body 421. The cover body 421 with the docking parts 422 is integrally in a "U" shape. A plurality of grid sheet slots 424 arranged at intervals are provided in the middle of the same cover body 421. The docking parts 422 on the same side of the two cover bodies 421 cooperate to form the side wall of the arc extinguishing cover 42 for opening the exhaust holes 423. Fig. 27 、 28 In, a plurality of opening grooves serving as the exhaust holes 423 are spaced apart from the edge of each docking part 422, and the plurality of exhaust holes 423 are arranged at equal intervals. When the docking parts 422 of the two cover bodies 421 are docked, the exhaust holes 423 of the two docking parts 422 on the same side are arranged in a staggered manner in the third direction. In this way, it is possible to prevent the arc and arc particles from being short-circuited outside the arc extinguishing cover 42. Of course, the exhaust holes 423 provided in each docking part 422 can also be through holes 1121.

[0114] Of course, docking portions 422 are respectively arranged on both side edges of one of the cover bodies 421, so that the overall shape of the cover body 421 is "U", and the other cover body 421 does not have the docking portion 422 and is in the shape of "-", and they can also enclose to form an arc extinguishing cover 42 with both ends open. At this time, exhaust holes 423 are opened in the middle of each docking portion 422, and adjacent two exhaust holes 423 are staggeredly opposite to each other; alternatively, a docking portion 422 is arranged on one side of each cover body 421, so that the overall shape of each cover body 421 is "L", and a plurality of exhaust holes 423 are opened in the docking portion 422 of each cover body 421.

[0115] As Figure 5-7 , shown in 29 and 33, the shorting plate 44 is located at one end of the arc running channel 402 far from the arc inlet 401. Two pins 441 of the shorting plate 44 are respectively close to one end of the two grid sheet groups 41 far from the arc inlet 401, so that the electrical clearance between one end of the two grid sheet groups 41 far from the arc inlet 401 is less than the minimum physical interval between the two grid sheet groups 41, that is, the distance between one end of each grid sheet group 41 far from the arc inlet 401 and a pin 441 is less than the minimum physical interval between the two grid sheet groups 41, so that the arc current needs to flow through the shorting plate 44 to form a loop, thereby realizing equipotential shorting of one end of the two grid sheet groups 41 far from the arc inlet 401. Further, the shorting plate 44 further includes an arc guiding plate 442. The arc guiding plate 442 is connected to the two pins 441 and extends along the midline of the arc running channel 402 towards the direction close to the arc inlet 401. The arc guiding plate 442 is used for bridging the arc.

[0116] As Fig.33 shown, the shorting plate 44 includes two arc guiding pieces. One ends of the two arc guiding pieces are attached to form the arc guiding plate 442. A notch 531 is opened at the end of the arc guiding plate 442. The notch 531 is located between the two grid sheet groups 41 to play a connecting role. The middle parts of the two arc guiding pieces are respectively deflected towards both sides to form deflected segments, and the end of each deflected segment is bent to form a pin 441, so that the overall shape of the shorting plate 44 is "person" shaped. Each pin 441 is respectively spaced opposite to the arc extinguishing grid sheet 411 at one end of a grid sheet group 41 far from the arc inlet 401 in the second direction, and the gap between the pin 441 and the arc extinguishing grid sheet 411 is much smaller than the distance between the two grid sheet groups 41. In the figure, each pin 441 is spaced opposite to the arc extinguishing notch 412 of the arc extinguishing grid sheet 411 of the grid sheet group 41 far from the arc inlet 401.

[0117] Further, as Fig.29 and 31As shown, a short-circuit plate mounting portion is provided in the arc extinguishing cover 42, and the short-circuit plate 44 is limitedly assembled in the arc running channel 402 by the short-circuit plate mounting portion. A short-circuit plate mounting portion is provided in the middle of at least one cover body 421, and the short-circuit plate mounting portion and the exhaust hole 423 are respectively provided on two adjacent side walls of the arc extinguishing cover 42. Preferably, a short-circuit plate mounting portion is provided in the middle of both cover bodies 421. When the two cover bodies 421 are combined to form the arc extinguishing cover 42, the short-circuit plate mounting portion is used to limit the short-circuit plate 44, as shown in FIG. Fig.29 , 31 As shown, the short-circuit board mounting portion includes a first boss 4261 and a second boss 4262 arranged at intervals, wherein the first boss 4261 is located at one end of the arc running channel 402 close to the arc entrance 401, and the second boss 4262 is located at one end of the arc running channel 402 away from the arc entrance 401, and the short-circuit board 44 is limitedly assembled between the first boss 4261 and the second boss 4262. In the figure, a notch 531 is provided on the side of the first boss 4261 facing the second boss 4262, and the notch 531 is engaged with the arc-starting plate 442 of the short-circuit board 44. The second boss 4262 is triangular in shape as a whole, and is used to separate and limit the two pins 441 of the short-circuit board 44, so that the two pins 441 of the short-circuit board 44 extend to the two grid plate groups 41 respectively. Of course, the short-circuit board 44 can also be assembled in the arc extinguishing cover 42 in other ways.

[0118] In addition, a pair of magnetic conductive plates 43 are spaced apart from each other in the third direction. In the third direction, the arc running channel 402 is located between the pair of magnetic conductive plates 43, so that after the pair of magnetic conductive plates 43 are magnetized, a magnetic field is formed in the arc running channel 402, and the direction of the magnetic field is the third direction, so as to accelerate the introduction of the arc into the two grid groups 41.

[0119] like Fig.26 , 27 As shown in Figure 30, a magnetic plate mounting portion is provided in the middle of each cover body 421, and the magnetic plate mounting portion is preferably located outside the arc extinguishing cavity. In the present embodiment, the magnetic plate mounting portion is located on the outer surface of the cover body 421, that is, it is provided on the outer surfaces of the two cover bodies 421. Specifically, the magnetic plate mounting portion includes a magnetic plate mounting groove 4251 and a fastening boss 4252 provided in the magnetic plate mounting groove 4251. In the figure, the magnetic plate mounting groove 4251 is opened on the outer surface of the cover body 421, and each magnetic plate mounting groove 4251 corresponds to the arc running channel 402. At least one fastening boss 4252 is protruding from the bottom of the magnetic plate mounting groove 4251, and the fastening boss 4252 is correspondingly plugged into the fastening groove of the magnetic plate 43. Fig.26 , 27 In the embodiment of the present invention, the magnetic conductive plate 43 is a rectangular plate structure, and two fastening grooves are provided in the middle of the magnetic conductive plate 43. Of course, the fastening boss 4252 may not be provided, and the magnetic conductive plate 43 may be directly embedded or bonded in the magnetic conductive plate mounting groove 4251.

[0120] In addition, the arc extinguishing hood 42 may also be provided with a limit assembly structure so that the arc extinguishing hood 42 can be stably assembled in the housing 5 of the contact unit. Fig.26 , 27 , 30 and 31, a snap-fit ​​groove 427 is provided at the edge of the arc-extinguishing cover 42 away from the arc entrance port 401. When the arc-extinguishing cover 42 is assembled in the housing 5 of the disconnector, the snap-fit ​​groove 427 can be engaged with the snap-fit ​​portion 55 in the housing 5 to achieve stable assembly. Of course, the limiting assembly structure may not be provided and the assembly may be directly performed by fasteners such as screws.

[0121] A second embodiment of an arc extinguishing system is provided (not shown).

[0122] The arc extinguishing system includes an arc extinguishing hood 42, two grid groups 41 and a pair of magnetic conductive plates 43, wherein the structures of the arc extinguishing hood 42, the grid group 41, the magnetic conductive plates 43 and the buffer zone 45 are the same as those of the first embodiment. The difference from the first embodiment is that the arc extinguishing system of this embodiment no longer has a short-circuit plate 44, but a connecting grid group is provided between the two grid groups 41, and the connecting grid group is provided at one end of the arc running channel 402 away from the arc entrance port 401, and the two ends of the connecting grid group are respectively spaced opposite to one end of each grid group 41 away from the arc entrance port 401, so that the electrical gap between the ends of the two grid groups 41 away from the arc entrance port 401 is less than the minimum physical gap between the two grid groups 41, that is, the distance between one end of each grid group 41 away from the arc entrance port 401 and one end of the connecting grid group and the electrical gap between the ends of the two grid groups 41 away from the arc entrance port 401 are less than the minimum physical gap between the two grid groups 41.

[0123] Specifically, the connecting grid group includes a plurality of connecting grids arranged at intervals in the second direction, and the connecting grids close to the grid group 41 are spaced opposite to the arc extinguishing grids 411 at the end of the grid group 41 away from the arc entrance port 401, thereby short-circuiting the ends of the two grid groups 41 away from the arc entrance port 401 with equal potential through the connecting grid group. In the present embodiment, the structure of the connecting grid is preferably the same as the arc extinguishing grids 411 of the grid group 41, and correspondingly, an arc extinguishing notch 412 is also provided at one end of each connecting grid, and the arc extinguishing notches 412 of the connecting grid group are connected and respectively connected to the arc extinguishing grooves 410 of the two grid groups 41.

[0124] In this embodiment, the connecting grid group is arranged along a straight line connecting the two grid groups 41, so that the two grid groups 41 and the connecting grid group form a "U"-shaped structure in the arc extinguishing cover 42. Of course, the connecting grid group can also be arranged along an arc line connecting the two grid groups 41, and preferably, the concave surface of the arc line faces the arc entrance port 401, so that the two grid groups 41 and the connecting grid group also form a "U"-shaped structure in the arc extinguishing cover 42. Alternatively, the connecting grid group can also be arranged along a fold line connecting the two grid groups 41, for example, along an inverted "V"-shaped fold line. Preferably, the interval between the two grid groups 41 away from the arc entrance port 401 gradually decreases, so that the two grid groups 41 and the connecting grid group form a "W"-shaped structure in the arc extinguishing cover 42.

[0125] A third embodiment of an arc extinguishing system is provided (not shown).

[0126] In this embodiment, the arc extinguishing system includes an arc extinguishing hood 42 that is the same as that in the first embodiment. Two grid groups 41 that are the same as those in the first embodiment are arranged in the arc extinguishing hood 42. An arc running channel 402 that is connected to the arc entrance port 401 is formed between the two grid groups 41. The arrangement of the arc extinguishing grids 411 in each grid group 41 is similar to that in the first embodiment. The difference from the first embodiment is that a short-circuit plate 44 is no longer arranged between the two grid groups 41. An arc extinguishing grid 411 of each grid group 41 that is away from the arc entrance port 401 serves as a tail grid, and the tail grids of the two grid groups 41 are connected to achieve equipotential short-circuiting.

[0127] Preferably, one end of each tail grid piece close to the arc running channel 402 is bent toward the arc entrance port 401 , thereby forming an arc starting portion protruding toward the arc entrance port 401 when the two tail grid pieces are connected, and the arc starting portion has a V-shaped structure for bridging the arc.

[0128] A fourth embodiment of an arc extinguishing system (not shown) is provided.

[0129] The arc extinguishing system includes two arc extinguishing covers 42 and two grid sets 41. Each grid set 41 adopts the grid set 41 of the first embodiment. The two grid sets 41 are respectively arranged in the two arc extinguishing covers 42. The two arc extinguishing covers 42 are provided with openings on opposite sides. In the second direction, the arc extinguishing groove 410 of each grid set 41 is opposite to the opening. An arc running channel 402 is formed between the two arc extinguishing grooves 410. The two arc extinguishing chambers 40 are connected to each other through the arc running channel 402 and the openings of the two arc extinguishing covers 42. 0 are interconnected through the arc running channel 402 and the openings of the two arc extinguishing covers 42. At this time, the arc running channel 402 is not completely located in the same arc extinguishing cover 42. It should be noted that the opening of each arc extinguishing cover 42 can cooperate with the partition in the contact unit or the connecting plate provided separately, so that the arc extinguishing cover 42 forms a "□"-shaped structure, but one side of the arc extinguishing cover 42 has an opening, and the side wall of the arc extinguishing cover 42 opposite to the opening is also provided with a plurality of exhaust holes 423, and two adjacent exhaust holes 423 are also staggered and opposite.

[0130] A short-circuit plate 44 which is the same as that of the first embodiment of the arc extinguishing system is arranged in the arc running channel 402, and the short-circuit plate 44 short-circuits the ends of the two grid groups 41 away from the arc entrance port 401 to the same potential. At this time, the arc extinguishing system includes two arc extinguishing chambers 40, and the short-circuit plate 44 is arranged between the openings of the two arc extinguishing covers 42, wherein the short-circuit plate 44 can adopt the structure of the first embodiment of the arc extinguishing system, and the two pins 441 of the short-circuit plate 44 preferably pass through each opening, so that each pin 441 is spaced opposite to the end of a grid group 41 away from the arc entrance port 401, and the arc starting plate 442 of the short-circuit plate 44 is located between the two openings, and the notch 531 on the arc starting plate 442 can connect the two arc extinguishing covers 42.

[0131] Alternatively, a connecting arc extinguishing chamber is further provided in the arc running channel 402, and a connecting grid group identical to that of the second embodiment of the arc extinguishing system is provided in the connecting arc extinguishing chamber, and the connecting grid group short-circuits the ends of the two grid groups 41 away from the arc entrance 401 at the same potential. In this case, the arc extinguishing system includes two arc extinguishing chambers 40 and one connecting arc extinguishing chamber.

[0132] Of course, the third embodiment may also use two arc extinguishing covers 42 . In this case, one end of at least one tail grid piece may pass through the opening of the arc extinguishing cover 42 , thereby forming an arc striking portion in the arc running channel 402 .

[0133] In this embodiment, the arc extinguishing system also includes a pair of magnetic conductive plates 43, wherein the magnetic conductive plates 43 are arranged outside the two arc extinguishing covers 42 along the third direction and the projection of the magnetic conductive plates 43 covers the arc running channel 402. It can also be considered that the guide plate 43 is stacked with the arc extinguishing cover 42 in the third direction, and the structure of the magnetic conductive plate 43 is also rectangular. Preferably, magnetic conductive plate mounting grooves 4251 are respectively provided on the outer side walls of the two arc extinguishing covers 42, and fastening bosses 4252 are respectively provided at the bottom of each magnetic conductive plate mounting groove 4251, and the fastening bosses 4252 are limitedly cooperated with the fastening grooves of the magnetic conductive plates 43, and the specific position is adjusted according to actual needs. Of course, the magnetic conductive plates 43 and the arc extinguishing covers 42 can also be cooperated in other ways.

[0134] In the above-mentioned embodiment of the arc extinguishing system, if Figure 1-5 As shown in Figure 35, each arc extinguishing system also includes two buffer zones 45. In the third direction, the two buffer zones 45 are located on both sides of the arc extinguishing cover 42, and each buffer zone 45 is opposite to the exhaust hole 423 of the arc extinguishing cover 42. A plurality of columns 451 opposite to the exhaust holes 423 are arranged in the buffer zones 45 along the third direction. The high-temperature exhaust gas discharged from the exhaust holes 423 does not need to be discharged from the outer casing 5 after being buffered by the plurality of columns 451. No additional exhaust port is required on the outer casing 5 to avoid the discharge of high-temperature gas affecting its safety of use.

[0135] Preferably, multiple columns 451 are arranged in at least two rows, and multiple columns 451 in each row are arranged at equal intervals along the first direction. The columns 451 in two adjacent rows are staggered relative to each other, which can further enhance the buffering effect within a limited space and help reduce the area of ​​the buffer zone 45. Furthermore, a baffle 52 is provided around the outer side of the arc extinguishing chamber 40, and the baffle 52 is spaced relative to the exhaust hole 423 of the arc extinguishing chamber 40, so that the space of the outer shell 5 between the baffle 52 and the exhaust hole 423 forms a buffer zone 45. The baffle 52 and the columns 451 are jointly protruded on the bottom wall of the outer shell 5. Preferably, the protruding height of the baffle 52 is greater than the protruding height of the columns 451, so as to prevent high-temperature exhaust gas from overflowing from the buffer zone 45 to the gas space in the outer shell 5, so that the columns 451 are fully utilized and the impact on other components in the outer shell 5 is reduced.

[0136] Combination Figure 1-5 35 and 35 provide a specific structure of a housing 5 .

[0137] like Figure 1-5 As shown in Figures 35, the shell 5 is an overall rectangular structure, and a central hole 54 is opened in the middle of the shell 5. Preferably, the central hole 54 is a through hole 1121. The output shaft of the operating mechanism passes through the central hole 54 and is linked to the rotating shaft 11 of at least one contact unit, or the transmission shaft 114 of a contact unit passes through the central hole 54 and is connected to the transmission groove 117 of the adjacent contact unit.

[0138] like Figure 2 , 4 As shown in Figure 35, the contact mechanism a and the arc extinguishing system are arranged in the housing 5, and a baffle 52 and a limit plate 53 are also arranged in the housing 5. The baffle 52 is arranged around the outer side of the arc extinguishing chamber 40, and the baffle 52 is spaced apart from the exhaust hole 423 of the arc extinguishing chamber 40. At this time, the area between the baffle 52 and the exhaust hole 423 serves as a buffer zone 45, and a plurality of columns 451 arranged at intervals are arranged in the buffer zone 45. Preferably, the plurality of columns 451 are arranged in at least two rows. In the figure, the columns 451 are arranged in three rows, and the plurality of columns 451 in each row are equally spaced along the first direction. Arrangement, the columns 451 of two adjacent rows are offset relative to each other in the second direction, which is used to extend the moving path of the exhaust gas in the buffer zone 45 so that the exhaust gas can be fully buffered. Further, the number of columns 451 in each row is gradually reduced; further, the protruding height of the column 451 is smaller than the protruding height of the baffle 52, so as to prevent the exhaust gas from overflowing from the buffer zone 45 and affecting the normal operation of other components in the housing 5. At the same time, the exhaust gas can be fully buffered and absorbed after multiple rebounds; the limit plate 53 is surrounded and fitted on the outer side of the contact mechanism a, and the limit plate 53 is connected with the baffle 52.

[0139] Preferably, a pair of limit plates 53 and two pairs of baffles 52 are provided in the shell 5, wherein the limit plates 53 extend along the first direction and are located on both sides of the central hole 54 in the second direction, and the contact mechanism a is located between the pair of limit plates 53, and each limit plate 53 is close to one side of the contact mechanism a. In this embodiment, in the first direction, a pair of limit plates 53 are located between the two pairs of baffles 52, and the two baffles 52 of the same pair are parallel and spaced apart, and each baffle 52 and the limit plate 53 are parallel to each other. In this way, after the baffle 52 and the limit plate 53 are connected, a relatively closed area can be divided in the middle of the shell 5, and the exhaust gas discharged from the exhaust hole 423 dissipates in the area, so as to avoid that the multiple side walls of the shell 5 contact the exhaust gas and generate high temperature, which affects the safety of use. Preferably, in the second direction, the interval between each pair of baffles 52 is greater than the interval between the pair of limit plates 53, and one end of each baffle 52 is deflected toward the direction close to the limit plate 53 and connected with the limit plate 53, such as Fig.35 As shown, each baffle 52 includes a straight section 521 and a connecting section 522. The distance between the two straight sections 521 of each pair of baffles 52 is greater than the distance between a pair of limit plates 53. Each connecting section 522 is obliquely connected between the straight section 521 and a limit plate 53. At this time, the relatively closed area is dumbbell-shaped as a whole, especially the limit plate 53 is fitted with the contact mechanism a, so that the exhaust gas of the buffer zone 45 cannot flow to the contact mechanism a, and cannot enter the gap between the contact mechanism a and the limit plate 53, thereby avoiding affecting the contact mechanism a.

[0140] At least one set of limiting structures is arranged between the shell 5 and the shell 3 of the contact mechanism a, and each set of limiting structures includes a concave-convex matching limiting portion and a matching portion, the limiting portion is arranged on the outer surface of the shell 3, and the matching portion is arranged in the shell 3. In this embodiment, two sets of limiting structures are arranged between the shell 5 and the shell 3, one set of limiting structures includes a first limiting portion 341 and a first matching portion 511, and the other set of limiting structures includes a second limiting portion 342 and a second matching portion 512, wherein the first limiting portion 341 and the second limiting portion 342 are respectively located on the outer surfaces of two adjacent side walls of the shell 3, and the first matching portion The first matching part 511 and the second matching part 512 are located on two adjacent inner side walls of the housing 5. Specifically, the annular groove surrounding the edge of the central groove is the first matching part 511, which is used to match with the first limiting part 341 of the housing 3, so as to limit the contact mechanism a in the first direction; the second matching part 512 is a protruding strip-shaped boss, and the second matching part 512 is arranged on the limiting plate 53. The first matching part 511 and the first limiting part 341 limit the movable contact assembly 1 from the third direction, and the second matching part 512 and the second limiting part 342 limit the contact mechanism a from the second direction, which is conducive to ensuring the stability of its assembly. In addition, a notch 531 is also arranged on the limiting plate 53, and the notch 531 corresponds to a static contact assembly 2 respectively. The wiring part 22 of each static contact assembly 2 is limited to pass through a notch 531, which is convenient for wiring.

[0141] A mutually cooperating snap-fitting structure is provided between the housing 5 and the arc-extinguishing cover 42, and the snap-fitting structure includes a snap-fitting snap-fitting slot 427 and a snap-fitting portion 55. In this embodiment, the snap-fitting slot 427 is provided in the arc-extinguishing cover 42, and the snap-fitting portion 55 is provided in the housing 5. Fig.35 In the figure, the connecting line direction between the two engaging parts 55 is parallel to the first direction. The engaging part 55 cooperates with the engaging groove 427 to limit the arc extinguishing system in the first direction. The two arc extinguishing systems limit the contact mechanism a in the first direction, so that the contact mechanism a is limited in three directions and assembled on the housing 5.

[0142] It should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc. indicate directions or positional relationships based on directions or positional relationships shown in the accompanying drawings, or directions or positional relationships that are usually placed when in use, and are only for the convenience of description, rather than indicating that the device or element referred to must have a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish descriptions, and cannot be understood as indicating relative importance.

[0143] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A contact unit, comprising a housing (5), a contact mechanism (a) and two arc extinguishing systems arranged in the housing (5), characterized in that: The contact mechanism (a) is arranged between two arc extinguishing systems along a first direction of the housing (5); the arc extinguishing system comprises an arc extinguishing chamber (40) and a buffer zone (45); the arc extinguishing chamber (40) comprises an arc extinguishing cover (42); one end of the arc extinguishing cover (42) is provided with an arc entry port (401); the arc entry port (401) is connected to the contact mechanism (a) in the first direction of the housing (5); the buffer zone (45) and the arc extinguishing cover (42) are arranged along a second direction of the housing (5); and the buffer zone (45) is connected to an exhaust hole (423) of the arc extinguishing chamber (40); and the first direction is perpendicular to the second direction.

2. The contact unit according to claim 1, characterized in that: The contact mechanism (a) comprises a housing (3), a moving contact assembly (1) and a pair of stationary contact assemblies (2); the housing cavity of the housing (3) is provided with two opposite openings, each opening is respectively connected to an arc entry opening (401); a pair of stationary contact assemblies (2) are arranged in the housing cavity between the two openings at intervals along a first direction, and the pair of stationary contact assemblies (2) are offset and opposite to each other in a second direction; the moving contact assembly (1) is rotatably arranged between the pair of stationary contact assemblies (2).

3. The contact unit according to claim 2, characterized in that: The moving contact assembly (1) is provided with two opening limiter parts (115), and two opening barrier parts (32) are provided in the accommodating cavity, and each opening barrier part (32) is located on the moving track of the opening limiter part (115).

4. The contact unit according to claim 3, characterized in that: The two opening blocking portions (32) are arranged at intervals along a first direction, and the two opening blocking portions (32) are offset and opposite to each other in a second direction. When the moving contact assembly (1) is rotated to the opening position, the opening limiting portion (115) abuts against the opening blocking portion (32) to block the two openings from being connected to each other.

5. The contact unit according to claim 1, characterized in that: The arc extinguishing system further comprises two grid plate groups (41) spaced apart and opposed to each other in a second direction, an arc running channel (402) communicating with the arc entry port (401) being formed between the two grid plate groups (41), each grid plate group (41) being provided with an arc extinguishing groove (410) communicating with the arc entry port (401), and a groove line of the arc extinguishing groove (410) being arranged along the first direction.

6. The contact unit according to claim 5, characterized in that: The two grid plate groups (41) have one end away from the arc entrance (401) short-circuited at the same potential.

7. The contact unit according to claim 5, characterized in that: The two grid plate groups (41) and the arc running channel (402) are arranged in the same arc extinguishing cover (42) to form an arc extinguishing chamber (40), or the two grid plate groups (41) are respectively arranged in two arc extinguishing covers (42) to form two arc extinguishing chambers (40), and openings are provided on opposite sides of the two arc extinguishing covers (42), and the arc extinguishing groove (410) of each grid plate group (41) is opposite to the opening, and the arc running channel (402) is formed between the two arc extinguishing grooves (410).

8. The contact unit according to claim 7, characterized in that: A short-circuit plate (44) is provided at one end of the arc running channel (402) away from the arc entrance port (401); two pins (441) of the short-circuit plate (44) are respectively close to one end of the two grid plate groups (41) away from the arc entrance port (401) along the second direction; and an arc-starting plate (442) of the short-circuit plate (44) extends in the first direction toward the arc entrance port (401).

9. The contact unit according to claim 7, characterized in that: A connecting grid group (41) is provided at one end of the arc running channel (402) away from the arc entrance (401), and two ends of the connecting grid group (41) are spaced opposite to one end of each grid group (41) away from the arc entrance (401), so that the gap between one end of each grid group (41) away from the arc entrance (401) and the connecting grid group (41) is smaller than the minimum physical interval between two grid groups (41).

10. An isolating switch, comprising an operating module and a contact module, characterized in that: The contact module comprises at least one contact unit according to any one of claims 1 to 9, and the operating mechanism of the operating module drives at least one contact unit to open and close the switch.

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