Contact unit and rotary isolation switch

Abstract

A contact unit and a rotary isolation switch. The contact unit comprises a housing and a contact mechanism provided in the housing, wherein the contact mechanism comprises a pair of stationary contact assemblies and a moving contact assembly, each stationary contact assembly comprising a stationary contact portion; arc-extinguishing systems are provided on either side of the contact mechanism, each arc-extinguishing system comprises an arc-extinguishing cover, one end of which serves as an arc inlet; the contact mechanism further comprises a shell, which has an accommodating cavity provided with two opposite openings, each opening being connected to one arc inlet; and the moving contact assembly and the stationary contact portions are mounted into the accommodating cavity, the moving contact assembly is located between the pair of stationary contact portions, and the contact mechanism and the arc-extinguishing systems on the two sides jointly form a relatively closed space. In the present invention, the contact mechanism and the arc-extinguishing systems on the two sides jointly form the relatively closed space, such that the arc generated by the contact mechanism flows in the relatively closed space, thereby improving the arc-striking and arc-quenching effects.

Description

Contact units and rotary disconnect switches

[0001] This application claims priority to Chinese patent application number 202310761027.1 and filing date June 26, 2023, and Chinese patent application number 202310761480.2 and filing date June 26, 2023. The entire contents of the above two Chinese patent applications are incorporated by reference into this application. Technical Field

[0002] The present invention relates to the field of switch electrical appliances, and in particular to a contact unit and a rotary isolating switch. Background Art

[0003] With the rapid development of the AC and DC electrical appliance industries, rotary disconnectors have been widely used. A disconnector is a switching device that combines both disconnecting and switching functions. Traditional rotary disconnectors typically include an operating module and a contact module driven by the operating module. The contact module comprises multiple stacked contact units, each of which is typically equipped with a contact mechanism and an arc extinguishing system. Existing contact units often suffer from the following drawbacks: First, the contact mechanism has numerous components, making assembly inconvenient; second, the arc extinguishing system is limited by space, resulting in poor arc extinguishing performance; third, the coordination between the contact mechanism and the arc extinguishing system is complex, resulting in poor arc striking performance; and fourth, the internal layout of the contact unit is complex, with the contact mechanism and arc extinguishing system, in particular, lacking a modular structure. Assembly is cumbersome and fails to meet the modular development requirements of disconnectors.

[0004] Summary of the Invention

[0005] The object of the present invention is to overcome at least one drawback of the prior art and to provide a contact unit and a rotary disconnector with a simple structure and high reliability.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] The present invention provides a contact unit, comprising a housing and a contact mechanism disposed within the housing, wherein the contact mechanism comprises a pair of static contact assemblies and a movable contact assembly, each static contact assembly comprising a static contact portion, an arc extinguishing system being disposed on both sides of the contact mechanism, the arc extinguishing system comprising an arc extinguishing hood, one end of the arc extinguishing hood serving as an arc inlet;

[0008] The contact mechanism also includes a shell, and the accommodating cavity of the shell is provided with two opposite openings, each opening is respectively connected to an arc inlet, the moving contact assembly and the static contact part are assembled in the accommodating cavity, and the moving contact assembly is located between a pair of static contact parts, and the contact mechanism and the arc extinguishing systems on both sides together form a relatively closed space.

[0009] Preferably, the arc extinguishing hood is open at both ends, one open end serves as the arc entrance, and the other open end is sealed by contacting with the shell; or the arc extinguishing hood is open at one end and closed at the other end, and the open end serves as the arc entrance.

[0010] Preferably, the moving contact assembly includes a rotating shaft and a moving contact bridge arranged radially along the rotating shaft. The rotating shaft rotates and is located between a pair of static contact parts. The two ends of the moving contact bridge serve as moving contact parts for cooperating with the static contact parts. The moving contact assembly cooperates with the accommodating cavity to block the two openings from being connected to each other.

[0011] Preferably, two gate-breaking limiting parts are protruding from the circumferential side wall of the rotating shaft, and two gate-breaking blocking parts are provided in the accommodating cavity. The gate-breaking blocking parts are located on the rotation trajectory of the gate-breaking limiting parts, and each gate-breaking limiting part is adjacent to a dynamic contact part. When the rotating shaft rotates to the gate-breaking position, the gate-breaking limiting part and the gate-breaking blocking part are limited and cooperated, and the rotating shaft, the two gate-breaking limiting parts and the two gate-breaking blocking parts block the two openings from being connected to each other.

[0012] Preferably, a static contact portion and a trip barrier portion are respectively located on both sides of the same opening of the shell, a dynamic contact portion and a trip limit portion rotate together between a static contact portion and a trip barrier portion, and the trip limit portion is located on the side of the dynamic contact portion facing away from the static contact portion.

[0013] Preferably, the shell is an integral structure; or, the shell includes two plates spaced apart and facing each other, the two plates together forming a hollow cavity open at both ends, the hollow part of the hollow cavity serving as a receiving cavity, and a mutually cooperating splicing structure is provided between the two plates, the splicing structure enabling the two plates to form a whole that can be plugged in and disassembled.

[0014] Preferably, the shell includes two plates spaced apart from each other, with extensions provided on both side edges of each plate, and the extensions on the same side of the two plates cooperate to form a connecting wall of the shell, each connecting wall is provided with an assembly groove and a gate barrier, and the middle parts of the two plates serve as a pair of support walls.

[0015] Preferably, the arc extinguishing system also includes a buffer zone, both ends of the arc extinguishing cover are open, one open end of the arc extinguishing cover serves as an arc entrance port, a plurality of exhaust holes are provided on the side wall of the arc extinguishing cover adjacent to the arc entrance port, the arc entrance port is connected with the contact mechanism in a 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 holes, and the first direction is perpendicular to the second direction.

[0016] Preferably, each arc extinguishing system includes two buffer zones, which are located on both sides of the arc extinguishing cover in the second direction. The buffer zones are provided with a plurality of columns opposite to the exhaust holes along a third direction, which is perpendicular to the first direction and the second direction respectively.

[0017] Preferably, a baffle is further provided around the outside of the arc extinguishing chamber, and the baffle is spaced apart from the exhaust hole of the arc extinguishing chamber so that the outer shell space between the baffle and the exhaust hole forms a buffer zone, and the multiple columns are arranged in at least two rows, and the multiple columns in each row are arranged at equal intervals along the first direction, and the columns in two adjacent rows are staggered relative to each other.

[0018] Preferably, the arc extinguishing system includes an arc extinguishing chamber, the arc extinguishing chamber includes an arc extinguishing cover and two grid groups arranged at intervals in the same arc extinguishing cover, and an arc running channel connected to the arc entrance is provided between the two grid groups, or the arc extinguishing system includes two arc extinguishing chambers, each arc extinguishing chamber includes an arc extinguishing cover and a grid group arranged in the arc extinguishing cover, an opening is provided on one side of each arc extinguishing cover adjacent to the arc entrance, the openings of the two arc extinguishing covers are opposite to each other, the arc extinguishing groove of each grid group is connected to the arc entrance, and the arc extinguishing groove of each grid group is respectively opposite to the opening, and the interval between the two grid groups forms an arc running channel connected to the arc entrance.

[0019] Preferably, the arc extinguishing system also includes a short-circuit plate, which is arranged at the end of the arc running channel away from the arc entrance port. The short-circuit plate includes two pins and an arc-starting plate, and the two pins extend toward the ends of the two grid groups away from the arc entrance port respectively, so that the electrical gap between the ends of the two grid groups away from the arc entrance port is less than the minimum physical distance between the two grid groups, and the arc-starting plate extends along the center line of the arc running channel toward the arc entrance port.

[0020] Preferably, an arc extinguishing grid away from the arc inlet of each grid group is a tail grid, the tail grids of the two grid groups are connected, and the tail grids of the two grid groups protrude toward the arc inlet to form an arc starting portion for bridging the arc;

[0021] Alternatively, a connecting grid group is provided at one end of the arc running channel away from the arc entrance, wherein the connecting grid group includes a plurality of connecting grids arranged at intervals, and the plurality of connecting grids are arranged along a straight line, arc line or broken line connecting the two grid groups.

[0022] Preferably, the arc extinguishing system further comprises at least two magnetic conductive plates arranged at intervals, each magnetic conductive plate being arranged outside the arc extinguishing cover, the arc running channel being located between the at least two magnetic conductive plates, and the magnetic conductive plates forming a magnetic field in the arc running channel.

[0023] The present invention also provides a rotary disconnector, comprising an operating module and a contact module, wherein the contact module comprises at least one contact unit as described above, and the operating mechanism of the operating module drives the at least one contact unit to open and close the switch.

[0024] The contact unit and rotary disconnector of the present invention, the contact mechanism and the arc extinguishing system respectively form a modular structure, which is convenient for assembly and also meets the modular development of the disconnector. At the same time, the shell of the contact mechanism is docked with the arc inlet of the arc extinguishing cover, and the contact mechanism and the arc extinguishing systems on both sides jointly form a relatively closed space, so that the arc generated by the contact mechanism flows in the relatively closed space, thereby improving the arc striking and arc extinguishing effects.

[0025] In addition, the moving contact assembly cooperates with the accommodating cavity to block the two openings of the shell from being connected. 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 also increasing the airtight effect.

[0026] In particular, the opening limit portion of the rotating shaft cooperates with the opening barrier portion of the housing, which can not only play a limiting role when opening the switch, but also increase the air tightness and creepage distance.

[0027] In addition, the arc extinguishing system forms a relatively closed space through the arc extinguishing cover, and is combined with the arrangement of two grid groups to improve its arc extinguishing capability.

[0028] 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 inlet 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 and improving the arc extinguishing effect.

[0029] 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 conducive to introducing the arc into the grid group and improving the arc extinguishing ability.

[0030] In addition, multiple columns are set up in the buffer zone to cool and absorb the exhaust gas, so that the exhaust gas is cooled and absorbed in the buffer zone, avoiding the exhaust gas from being discharged from the casing, thereby improving safety of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] FIG1 is a schematic structural diagram of a contact unit in the present invention;

[0032] FIG2 is a schematic structural diagram of the contact mechanism and the arc extinguishing chamber in the present invention (when the circuit breaker is closed);

[0033] FIG3 is a schematic structural diagram of the contact mechanism and the arc extinguishing chamber in the present invention (when the switch is open);

[0034] FIG4 is a schematic diagram of arc flow when the contact mechanism is open in the present invention;

[0035] FIG5 is a schematic structural diagram of the contact mechanism of the present invention;

[0036] Figures 6-7 are exploded schematic diagrams of the contact mechanism of the present invention;

[0037] FIG8 is a schematic structural diagram of the side of the plate body facing the accommodating cavity in the present invention;

[0038] FIG9 is a schematic structural diagram of the side of the plate facing away from the accommodating cavity in the present invention;

[0039] Figures 10-11 are schematic structural diagrams of the rotating shaft and the moving contact bridge of the present invention;

[0040] FIG12 is a schematic diagram of the structure of the rotating shaft and the moving contact bridge after decomposition of the present invention;

[0041] 13 is a schematic structural diagram of the contact support facing the cover plate side of the present invention;

[0042] 14 is a schematic structural diagram of the contact support facing away from the cover plate in the present invention;

[0043] 15 is a schematic structural diagram of the cover plate facing the contact support side of the present invention;

[0044] FIG16 is a schematic structural diagram of the cover plate facing away from the contact support side of the present invention;

[0045] FIG17 is a schematic structural diagram of the movable contact bridge of the present invention;

[0046] 18 is a schematic structural diagram of the movable contact piece and the elastic member of the present invention;

[0047] FIG19 is a schematic structural diagram of the movable contact piece of the present invention;

[0048] FIG20 is a side view of the movable contact piece of the present invention;

[0049] FIG21 is a schematic structural diagram of the elastic member of the present invention;

[0050] FIG22 is a schematic structural diagram of a support member in the present invention;

[0051] Figures 23-24 are schematic structural diagrams of the arc extinguishing chamber of the present invention;

[0052] 25-26 are schematic structural diagrams of the cover body, grid assembly, and short-circuit board in the present invention;

[0053] FIG27 is a schematic structural diagram of the cover body of the present invention;

[0054] FIG28 is a schematic structural diagram of a cover body provided with a grid slot in the present invention;

[0055] FIG29 is a schematic structural diagram of a grid plate assembly according to the present invention;

[0056] FIG30 is a schematic structural diagram of the short circuit board of the present invention;

[0057] FIG31 is a schematic structural diagram of the magnetic conductive plate of the present invention;

[0058] FIG32 is a schematic structural diagram of a contact unit in the present invention;

[0059] Figure 33 is a schematic structural diagram of the housing of the present invention;

[0060] Reference numerals:

[0061] 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-clamping member, 2-static contact assembly, 21-static contact portion, 22-wiring portion, 3-housing, 301-plate, 302-support wall, 303-connecting wall, 304-extension portion, 31-assembly groove, 32-disconnecting 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 entrance, 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- docking portion, 423- exhaust hole, 424- grid slot, 4251- magnetic plate mounting slot, 4252- fastening boss, 4 261 - First boss, 4262 - Second boss, 427 - Engaging groove, 43 - Magnetic conductive plate, 431 - Fastening groove, 44 - Shorting plate, 441 - Pin, 442 - Arc-starting plate, 45 - Buffer zone, 451 - Post, 5 - Housing, 511 - First mating portion, 512 - Second mating portion, 52 - Baffle, 521 - Straight section, 522 - Connecting section, 53 - Limiting plate, 531 - Notch, 54 - Central hole, 55 - Engaging portion. DETAILED DESCRIPTION

[0062] The following embodiments are combined with the accompanying drawings to further illustrate the specific implementation of the contact unit and the rotary disconnector of the present invention. The contact unit and the rotary disconnector of the present invention are not limited to the description of the following embodiments.

[0063] The rotary disconnector includes an operating module and a contact module arranged in a stacked manner. The contact module includes 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.

[0064] Specifically, as shown in Figure 1, 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. The contact mechanism a includes a moving contact assembly 1 and a pair of static contact assemblies 2. Each static contact assembly 2 is connected to a wiring assembly. The moving contact assembly 1 rotates between the pair of static contact assemblies 2 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 by the rotating shaft 11, thereby realizing synchronous opening and closing of the contact mechanisms a in all contact units.

[0065] Each 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 inlet 401 of the arc extinguishing system is connected to the contact mechanism a. The arc extinguishing system includes an arc extinguishing cover 42 and a grid group 41 arranged in the arc extinguishing cover 42. The arc generated when the contact mechanism a is disconnected is introduced from the arc inlet 401 of the arc extinguishing cover 42, and the arc is cut by the grid group 41 to extinguish the arc.

[0066] As shown in Figures 1-4, the improvement of the present application is that the arc extinguishing system includes an arc extinguishing cover 42, one end of the arc extinguishing cover 42 serves as an arc entry port 401; the contact mechanism a also includes a shell 3, the housing cavity of the shell 3 is provided with two relative openings, each opening corresponding to and connected to an arc entry port 401, the moving contact assembly 1 and the static contact portion 21 are assembled in the housing cavity, and the moving contact assembly 1 is located between a pair of static contact portions 21, and the contact mechanism and the arc extinguishing systems on both sides jointly form a relatively closed space. In this way, the contact mechanism a and the arc extinguishing system respectively form a modular structure, which is convenient for assembly and also meets the modular development of the disconnector. At the same time, the shell 3 of the contact mechanism a is docked with the arc entry port 401 of the arc extinguishing cover 42, and the contact mechanism and the arc extinguishing systems on both sides jointly form a relatively closed space, so that the arc generated by the contact mechanism a flows in a relatively closed space, thereby improving the arc striking and arc extinguishing effects.

[0067] Specifically, as shown in Figure 5, the shell 3 is provided with a pair of opposing openings, and the two pairs of side walls of the shell 3 connected between the pair of openings are respectively a pair of supporting walls 302 and a pair of connecting walls 303, each connecting wall 303 is adjacent to a supporting wall 302, and the static contact portion 21 of each static contact assembly 2 is respectively arranged on a connecting wall 303, and the two static contact portions 21 are spaced apart and staggered relative to each other. The moving contact assembly 1 includes a rotating shaft 11 and a moving contact bridge 12 arranged radially along the rotating shaft 11, wherein the rotating shaft 11 is rotatably supported between the pair of supporting walls 302, that is, the rotating shaft 11 is rotatably supported between the pair of static contact portions 21, and the two ends of the moving contact bridge 12 serve as moving contact portions 120, respectively, and each moving contact portion 120 moves between the pair of connecting walls 303 for cooperating with a static contact portion 21.

[0068] Specifically, both ends of the arc extinguishing hood 42 are open, and the interior space of the arc extinguishing hood 42 forms an arc extinguishing cavity. One open end of the arc extinguishing hood 42 serves as the arc entrance 401, and the other open end abuts against the shell 5 for sealing. At least one grid group 41 is provided in the arc extinguishing hood 42 on one side of the arc entrance 401. Each grid group 41 includes a plurality of arc extinguishing grids 411 spaced opposite to each other, and an arc extinguishing gap is formed between two adjacent arc extinguishing grids 411. A plurality of exhaust holes 423 are provided on the side wall of the arc extinguishing hood 42 adjacent to the arc entrance 401, and the exhaust holes 423 are connected to the arc extinguishing gap. When the arc entrance 401 is docked with the open end of the shell 3, the arc extinguishing cavity docks with the accommodating cavity of the shell 3 to form a relatively closed space, thereby improving the arc striking and arc extinguishing effects. Of course, the arc extinguishing hood 42 can also adopt a structure with one end closed and the other end open, wherein the open end of the arc extinguishing hood 42 serves as the arc entrance 401, and the closed end can abut against the shell 5 to achieve limited assembly.

[0069] Furthermore, the moving contact assembly 1 cooperates with the accommodating chamber to block the two openings from being connected to each other. For example, the rotating shaft 11 abuts against the inner wall of the accommodating chamber, but this may affect the smoothness of its rotation. Preferably, a limiting portion and a blocking portion that cooperate with each other are provided between the rotating shaft 11 and the accommodating chamber. The limiting portion and the blocking portion block the two openings from being connected to each other when the rotating shaft 11 is rotated to the opening position. While ensuring the smoothness of rotation, the accommodating chamber is also separated into two independent parts, thereby avoiding the two arc extinguishing systems from affecting each other through the accommodating chamber.

[0070] Specifically, as shown in Figures 7 and 10-12, two trip limit portions 115 are protruding from the circumferential side walls of the rotating shaft 11, a trip blocking portion 32 is provided in the accommodating cavity, and the trip blocking portion 32 is located on the trajectory of the trip limit portion 115. When the rotating shaft 11 rotates to the trip position, the trip limit portion 115 and the trip limit portion 115 are limited and cooperated, and the two openings are blocked from being connected to each other by the rotating shaft 11 and the two trip limit portions 115. In this way, it can play a role of mutual limitation when opening, and also increase the air tightness and creepage distance between the arc extinguishing system and the contact mechanism a.

[0071] Furthermore, as shown in Figures 25 and 26, the arc extinguishing system includes an arc extinguishing hood 42 and two grid groups 41 arranged at intervals. The two ends of the arc extinguishing hood 42 are open, and one of the open ends serves as the arc entrance 401. The other open end opposite to the arc entrance 401 is closed by the shell 5, preferably assembled in the shell 5 and closed by the inner side wall of the shell 5. Of course, the other open end of the arc extinguishing hood 42 can also be closed by a partition plate arranged in the shell 5. Alternatively, the arc extinguishing hood 42 can directly adopt a structure with one end closed and the other end open. Thus, a relatively closed arc extinguishing hood 42 is formed inside the arc extinguishing hood 42. A closed arc extinguishing cavity, with a grid group 41 arranged in an arc extinguishing cover 42 on one side of the arc entrance port 401, forms an arc extinguishing chamber 40 by the arc extinguishing cover 42 and the grid group 41 arranged in the arc extinguishing cover 42, and an arc running channel 402 connected to the arc entrance port 401 is formed between the two grid groups 41. The arc enters each grid group 41 through the arc entrance port 401 and the arc running channel 402, and the arc is cut by the arc extinguishing grid 411 of each grid group 41. A plurality of exhaust holes 423 are provided on the side wall of the arc extinguishing cover 42 adjacent to the arc entrance port 401, and the exhaust gas generated after the arc is cut is discharged from the exhaust holes 423.

[0072] Preferably, as shown in Figures 23-26, each arc extinguishing system further includes a shorting plate 44 and / or at least two magnetic conductive plates 43, wherein the shorting plate 44 is disposed at the end of the arc running channel 402 away from the arc inlet 401. The shorting plate 44 ensures that the electrical gap between the ends of the two grid plate groups 41 away from the arc inlet 401 is less 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 inlet and a pin 441 of the shorting plate 44 is less than the minimum physical distance between the two grid plate groups 41. The shorting plate 44 short-circuits the ends of the two grid plate groups 41 away from the arc inlet 401 to the same potential, 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 grids 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 inlet 401 to the same potential can also improve the utilization rate of the arc extinguishing grids 411.

[0073] Preferably, there are at least two magnetic conductive plates 43, and the magnetic conductive plates 43 are arranged in pairs and at intervals, 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 line connecting the two grid groups 41, so that the arc entering the arc running channel 402 is guided into the grid group 41 under the action of the magnetic field, thereby improving the arc extinguishing capability. The magnetic conductive plates 43 can be embedded in the side wall of the arc extinguishing hood 42, or can be arranged on the inner side wall surface of the arc extinguishing hood 42, that is, the magnetic conductive plates 43 are located within the arc extinguishing cavity, but this can easily cause arc stagnation. Preferably, the magnetic conductive plates 43 are arranged on the outer side wall surface of the arc extinguishing hood 43, that is, the magnetic conductive plates 43 are located outside the arc extinguishing cavity.

[0074] A specific embodiment of a contact unit is provided in conjunction with Figures 1-31.

[0075] As shown in Figures 1-4, the contact unit includes a shell 5, 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, 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 relative openings, and each arc extinguishing system includes an arc extinguishing cover 42, one end of the arc extinguishing cover 42 is open, and the other end is closed, so that a relatively closed arc extinguishing cavity is formed inside the arc extinguishing cover 42, and the open end of each arc extinguishing cover 42 serves as an arc entrance port 401, and each arc entrance port 401 is respectively docked with an opening of the shell 3, that is, the two openings of the shell 3 are seamlessly connected to the open ends of the arc extinguishing cover 42 on the same side thereof, so that the arc extinguishing cavity and the accommodating cavity are connected together in an approximately sealed manner to form a relatively closed space. The other open end away from the arc entrance port 401 is in close contact with the inner wall of the outer shell 5 and is closed by the inner wall of the outer shell 5 or a partition plate arranged in the outer shell 5, thereby closing the end of the arc extinguishing cavity away from the arc entrance port 401. Of course, when the arc extinguishing cover 42 is a structure with one end closed and the other end open, the closed end is in close contact with the inner wall of the outer shell 5 to achieve limited installation.

[0076] As shown in Figure 5-22, 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 the two openings. The moving contact bridge 12 is arranged in the rotating shaft 11 along the radial direction of the rotating shaft 11. The two ends of the moving contact bridge 12 serve as moving contact parts 120 extending radially to the outside of the rotating shaft 11. In this embodiment, each moving contact part 120 corresponds to an opening respectively, that is, when the moving contact assembly 1 is opened and closed, each moving contact part 120 moves from one side of an opening to the other side of the same opening. During this process, part of the moving contact part 120 can extend out of the opening, that is, move within the open end. It can also be understood that part of the moving contact part 120 can move within the arc entrance 401.

[0077] Specifically, as shown in FIGS. 5-9, two pairs of side walls of the housing 3 connected between two openings are respectively a pair of support walls 302 and a pair of connecting walls 303. Each connecting wall 303 is adjacent to a support wall 302. A communication hole 33 is provided in the middle of the pair of support walls 302. The rotating shaft 11 is rotatably supported between the pair of connecting 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 pass through the communication hole 33 to drive the rotating shaft 11 to rotate. A first limiting portion 341 is protrudingly provided on the outer surface of the support wall 302. In this embodiment, as shown in FIGS. 5-9, the first limiting portion 341 is an annular boss surrounding the communication hole 33. A second limiting portion 342 is provided on the outer surface of the connecting wall 303. In FIGS. 7 and 9, the second limiting portion 342 is a strip-shaped groove, and the central axis of the strip-shaped groove is parallel to the central axis of the communication hole 33. Correspondingly, a first fitting portion and a second fitting portion are provided in the housing 5 for assembling the moving contact assembly 1. Specifically, the first fitting portion is preferably an annular groove. Usually, a central hole is provided in the middle of the housing 5, and the first fitting portion is arranged around the edge of the central hole. The second fitting portion is a protruding strip-shaped boss. The first fitting portion and the first limiting portion 341 axially limit the moving contact assembly 1 parallel to the axis of the rotating shaft 11, and the second fitting portion and the second limiting portion 342 axially limit the contact mechanism a perpendicular to the axis of the rotating shaft 11, which is beneficial to ensuring the stability of its assembly.

[0078] In this embodiment, as shown in FIGS. 5-9, the housing 3 includes two spaced-apart plate bodies 301. The shapes of the two plate bodies 301 may be the same or different, but the two plate bodies 301 enclose a hollow cavity with both ends open, and the hollow cavity is a "□"-shaped cavity as a whole. The hollow part of the hollow cavity serves as the accommodation cavity. Among them, the two plate bodies 301 can be formed by the cooperation of a "one" shape and a "凵" shape respectively, or can be enclosed by two "凵"-shaped plate bodies 301. Or, both of the two plate bodies 301 are shaped.

[0079] As shown in FIGS. 8 and 9, in this embodiment, it is preferred that each plate body 301 is integrally in a rectangular plate-like structure. Protruding extension portions 304 are provided on both sides of the plate surface of each plate body 301, so that each plate body 301 presents a "凵" shape. The extension portions 304 on the same side of the two plate bodies 301 cooperate to form a pair of connecting walls 303 of the housing 3. The two extension portions 304 can be overlapped or butted to form the connecting wall 303. The middle parts of the two plate bodies 301 are spaced apart relatively to form a pair of support walls 302 of the housing 3.

[0080] Furthermore, as shown in Figures 7 and 8, a mutually cooperating splicing structure is provided between the two plate bodies 301, and the splicing structure includes at least one pair of mutually cooperating clips 351 and slots 352, one of the plate bodies 301 is provided with a slot 352 and / or a clip 351, and the other plate body 301 is provided with a clip 351 and / or a slot 352. In this embodiment, a slot 352 is provided in the middle of the two extensions 304 of one of the plate bodies 301, and a clip 351 is protruding in the middle of the two extensions 304 of the other plate body 301. When the two extensions 304 are docked to form a connecting wall 303, the clip 351 cooperates with the slot 352 to form a plug-in and disassembly structure, which is convenient for assembling the rotating shaft 11 in the accommodating cavity.

[0081] As shown in Figures 7 and 8, a groove structure serving as a gate-breaking barrier portion 32 is provided on the edge of each extension portion 304. Each groove structure is an arc-shaped groove and its opening is inclined toward the opening of the shell 3, so that the edge of each extension portion 304 forms an "S" shape. The center line of each groove structure coincides with a partial moving trajectory of the gate-breaking limit portion 115. In this embodiment, the two gate-breaking barrier portions 32 form a rotationally symmetrical structure about the central axis of the connecting hole 33.

[0082] Preferably, an assembly groove 31 is provided in each connecting wall 303, and 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 symmetrical structure about the central axis of the connecting hole 33. In this embodiment, a groove structure is provided on the end face edge of each extension portion 304. When the two extension portions 304 are docked, the two groove structures cooperate to form an assembly groove 31. Each assembly groove 31 is located in the middle of the connecting wall 303. An assembly groove 31 and a disconnecting barrier portion 32 are provided on the same connecting wall 303. That is, a static contact portion 21 and a disconnecting barrier portion 32 are respectively located on the connecting walls 303 on both sides of the same opening of the shell 3. The static contact assembly 2 can be clamped when the two extension portions 304 are docked, thereby achieving stable cooperation between the static contact assembly 2 and the shell 3.

[0083] Of course, the housing 3 may also not be provided with the assembly groove 31 , and the static contact assembly 2 extends from the opening of the housing 3 to the interior 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 .

[0084] Furthermore, at least one set of positioning structures can be provided between the two plate bodies 301, wherein the positioning structure includes a positioning boss (not shown) and a positioning groove 361, wherein one plate body 301 is provided with a positioning boss and / or a positioning groove 361, and the other plate body 301 is provided with a positioning groove 361 and / or a positioning boss. In this embodiment, the two extensions 304 of one plate body 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 connecting hole 33, that is, the two positioning grooves 361 in Figure 8 are respectively located at the corner positions of the same plate body 301, and a positioning boss is respectively provided on the two extensions 304 of the two plate bodies 301, and each positioning boss cooperates with a positioning groove 361 for positioning, which is convenient for assembly.

[0085] In addition, the two extensions 304 can be fixedly connected together, for example, by means of screws or bonding by processes such as hot riveting and ultrasonic riveting. At this time, the two extensions 304 can be either end-to-end or side-to-side contact, which can ensure the stability of the shell 3, but is inconvenient for disassembly and assembly. In this case, an assembly groove 31 needs to be opened in the connecting wall 303.

[0086] Of course, the shell 3 can also be an integrally formed structure (see Figure 5). In this case, the connecting wall 303 is an integral structure, and the assembly groove 31 is directly opened in the middle of the connecting wall 303, and the gate barrier part 32 is set at the same position in the accommodating cavity.

[0087] In this embodiment, the axial height of the rotating shaft 11 is greater than or equal to the interval between a pair of support walls 302, and two gate-breaking limiting portions 115 are protruded from the circumferential side wall of the rotating shaft 11. The two openings of the accommodating cavity are blocked from communicating with each other by the rotating shaft 11 and the two gate-breaking limiting portions 115. Preferably, the two ends of the rotating shaft 11 are respectively in rotational contact with the support walls 302, that is, the rotating surfaces of the rotating shaft 11 are respectively in rotational contact with the support walls 302 to limit the axial movement of the rotating shaft 11, thereby closing the gap between the rotating shaft 11 and the communicating hole 33. When the rotating shaft 11 is rotated to the gate-breaking position, the two gate-breaking limiting portions 115 are in abutment with the accommodating cavity (the inner wall of the housing 3) to prevent the rotating shaft 11 from moving in the axial direction. The two openings are blocked from being connected to each other. Furthermore, a trip blocking portion 32 is provided in the accommodating cavity. The trip blocking portion 32 is located on the moving trajectory of the trip limiting portion 115. When the rotating shaft 11 rotates to the trip position, the trip limiting portion 115 cooperates with the trip blocking portion 32 to limit further rotation of the rotating shaft 11. The thickness of the trip limiting portion 115 and / or the trip blocking portion 32, or the overall thickness after the trip limiting portion 115 cooperates with the trip blocking portion 32, is equal to the distance between a pair of support walls 302, thereby achieving mutual connection between the two openings of the blocking accommodating cavity, thereby having the effect of airtight guidance and increasing the creepage distance.

[0088] Of course, when the tripping limit portion 115 is not used to block the two openings of the shell 3 from being connected, the tripping limit portion 115 can also be set at other positions of the rotating shaft 11. For example, the tripping limit portion 115 is set on the rotating surface of the rotating shaft 11. At this time, the tripping blocking portion 32 is an arc-shaped track groove set on the support wall 302, and the opening of the arc-shaped track groove faces the tripping limit portion 115. After the rotating shaft 11 rotates to the tripping position, the tripping limit portion 115 abuts against the closed end of the arc-shaped track groove.

[0089] As shown in Figures 6, 7 and 10-16, the rotating shaft 11 is cylindrical as a whole, and the two dynamic contact parts 120 extend radially to the outside of the rotating shaft 11 respectively. A gate-breaking limit part 115 is protrudingly provided on the circumferential side wall of the rotating shaft 11. There are two gate-breaking limit parts 115 in Figures 7, 11 and 12. The two gate-breaking limit parts 115 form a rotationally symmetrical structure about the axis of the rotating shaft 11, and each gate-breaking limit part 115 is adjacent to a dynamic contact part 120 respectively to avoid a large gap between the gate-breaking limit part 115 and the dynamic contact part 120 to limit the rotation angle of the rotating shaft 11. As the rotating shaft 11 rotates in the housing 3, each dynamic contact portion 120 and the opening limit portion 32 adjacent to the dynamic contact portion 120 move together between the static contact portion 21 and the opening barrier portion 32 on both sides of the same opening, and when opening, the opening limit portion 115 is located on the side of the dynamic contact portion 120 facing away from the static contact portion 21.

[0090] 7 and 10 - 12 , a specific structure of a split shaft 11 is provided. The shaft 11 includes a contact support 111 and a cover plate 112 covering the contact support 111 .

[0091] As shown in Figures 10-14, 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. Both ends of the radial groove 1111 are open, and the moving contact bridge 12 is assembled in the radial groove 1111 and the two 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; a protruding portion 111 is provided on the circumferential side wall of the contact support 111. Two bosses serving as the trip limiter 115 form a rotationally symmetrical structure about the axis of the contact support 111, and each boss is located on the side immediately adjacent to the open radial slot 1111. A rotating portion 113 is protruding from the other side surface of the contact support 111. The rotating portion 113 is located at the center of the contact support 111 and rotatably engages with a connecting hole 33 of a support wall 302. A transmission slot 117 is provided on either side of the rotating portion 113, and each transmission slot 117 is coaxial with the transmission shaft 114. It should be noted that the transmission shaft 114 can also be assembled individually on the contact support 111, and the transmission shafts 114 do not need to be arranged in pairs. However, the transmission shafts 114 are preferably located at a position offset 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.

[0092] As shown in Figures 10-12, 15 and 16, 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 shell 3 for plugging with 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 serving 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 to the boss located on the contact support 111; of course, it is also possible to provide a boss as the opening limit portion 115 only on the cover plate 112 or the contact support 111.

[0093] As shown in Figures 7 and 1-12, 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 the side of the contact support 111 facing away from the cover plate 112 and the edge of the side of the cover plate 112 facing away from the contact support 111. When the cover plate 112 is covered on 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 is snapped into a snap member 13, thereby The contact support 111 and the cover plate 112 are connected together. In this embodiment, the cover plate 112 and the contact support 111 are connected together through two clips 13. The two clips 13 are symmetrically arranged on opposite sides of the rotating shaft 11, and the center line of the two clips 13 is perpendicular to the central axis of the moving contact bridge 12. That is, the clips 13, the snap grooves 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.

[0094] In addition, the fastener 13 can be an integral structure with the cover plate 112 or the contact support 111. For example, if the fastener 13 and the cover plate 112 are an integral structure, the snap-fitting groove 116 is only provided at the edge of the contact support 111. Alternatively, if the fastener 13 and the contact support 111 are an integral structure, the snap-fitting 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 processes such as heat fusion or ultrasonic welding.

[0095] 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 the moving contact bridge 12 is provided inside the rotating body. The two ends of the radial groove 1111 pass through 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 on one side of the rotating body A rotating portion 113 is protruded from the housing, and the rotating portion 113 is rotatably engaged 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 deviated from the axis, 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 deviated from the axis 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 of the rotating shaft 11.

[0096] 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 clamping force for the clamping gap 1201. Each moving contact portion 120 extends radially to the outside 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.

[0097] Preferably, as shown in Figures 12 and 17-20, the dynamic contact bridge 12 of this embodiment also includes at least two elastic members 122, at least one elastic member 122 is arranged on one side of a dynamic contact portion 120, and the elastic member 122 provides a 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.

[0098] 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. Furthermore, as shown in Figure 21, 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 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 large, causing the elastic member 122 to elastically deform, and the elastic member 122 provides reverse pressure on the moving contact piece 121 to ensure the contact pressure between the dynamic 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.

[0099] Furthermore, the moving contact piece 121 is also provided with a limiting groove 1211 for limiting the elastic member 122. 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 in the multiple limiting grooves 1211, so that the elastic member 122 has multiple adjustable assembly positions, and the force arm of the deformation of the moving contact bridge is changed by changing the position where the elastic member 122 applies the force value, thereby adjusting the clamping force applied by the elastic member to the moving contact bridge, which is conducive to adjusting the additional clamping force provided by the elastic member 122 for the clamping gap.

[0100] An embodiment of a moving contact bridge 12 is provided with reference to Figures 11, 12, and 17-21.

[0101] As shown in Figures 12 and 17, the dynamic contact bridge 12 includes two dynamic contact pieces 121, two elastic members 122, and a support member 123. The two dynamic contact pieces 121 are parallel and spaced apart from each other. The centers of the two dynamic contact pieces 121 are connected together by the support member 123. The same ends of the two dynamic contact pieces 121 cooperate to form a dynamic contact portion 120 having a clamping gap 1201. An elastic member 122 is provided between each dynamic contact portion 120 and the support member 123 to provide additional clamping force for the clamping gap 1201. In this embodiment, the elastic member 122 preferably has a U-shaped structure. Of course, the elastic member 122 can also be an annular structure that is sleeved outside the two dynamic contact pieces 121. In addition, more than one elastic member 122 can be provided between each dynamic contact portion 120 and the support member 123 according to actual needs.

[0102] As shown in Figures 17-21, the dynamic contact piece 121 of this embodiment includes a contact piece body, which is a strip-shaped plate-shaped conductor. A positioning hole 1212 is provided in the middle of the contact piece body. The sides of the two end portions 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. In Figures 17-19, the two guide pieces 1210 of the same contact piece body extend in opposite directions respectively. The same ends of the two dynamic contact pieces 121 are spaced apart to form a dynamic contact portion 120. At this time, the gap between the two dynamic contact pieces 121 corresponds to the part of the dynamic contact portion 120 as the clamping gap 1201. The same side of the same dynamic contact portion 120 has two spaced-apart guide pieces 1210, which provide a guiding effect for the static contact assembly 2. The static contact portion of the static contact assembly 2 21 enters the clamping gap 1201 from the guide piece 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 or equal to the number of elastic members 122, and the redundant limiting grooves 1211 serve as spare limiting grooves, which are convenient for adjusting the assembly position of the elastic member 122, thereby adjusting the clamping force of the elastic member 122. Of course, when the number of limiting grooves 1211 is equal to the number of elastic members 122, the assembly position cannot be adjusted. In Figures 19 and 20, 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.

[0103] As shown in Figures 17 and 21, 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 spaced apart from 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 forming the elastic opening 1222 correspond to the card slots 1211 on one side edge of the contact body. Into the limiting groove 1211 on the other side edge of the contact body. In this 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 guide piece 1210 are located on the same side of the dynamic contact bridge 12. When the static contact part 21 enters the clamping gap 1201, the static contact part 21 can correspondingly expand the elastic opening 1222, thereby causing the elastic member 122 to undergo elastic deformation, which can enable the degrees of freedom of the two dynamic contact pieces 121 to be adaptively adjusted, thereby reducing the risk of collision and poor closing caused by the dynamic contact part 120 and the static contact part 21 not being centered due to manufacturing errors of components.

[0104] As shown in Figure 17, the support member 123 includes a main body 13. The main body 13 in the figure is cylindrical, and a protruding shaft 1232 is protruded from the opposite ends of the main body 13. Each protruding shaft 1232 corresponds to and is plugged into a positioning hole 1212 of a moving contact piece 121. The axial height of the main body 13 limits the distance between the two moving contact pieces 121, that is, the clamping gap 1201 of each moving contact portion 120.

[0105] The static contact assembly 2 that cooperates with the moving contact assembly 1 can adopt the existing technology. In this embodiment, preferably, as shown in Figures 5-7, the static contact assembly 2 includes a conductive plate, each conductive plate corresponding to a mounting groove 31, and when the shell 3 is spliced ​​by two plate bodies 301, preferably each conductive plate is clamped under the action of the two plate bodies 301, and 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). The other end of the conductive plate is provided with a wiring portion 22, and each wiring portion 22 is located outside the shell 3 for connecting to the wiring assembly. When the moving contact assembly 1 of this embodiment cooperates with the static contact assembly 2, the elastic opening 1222 of the elastic member 122 preferably faces the static contact portion 21.

[0106] 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 respectively rotate through a connecting hole 33 of the shell 3, and the two moving contact pieces 121 of the moving contact bridge 12 are spaced relative to each other between a pair of support walls 302 of the shell 3.

[0107] As shown in Figures 1 and 23-26, the arc extinguishing system is arranged on one side of the contact mechanism a to extinguish the arc generated when the contact mechanism a is opened. The arc entrance port 401 of the arc extinguishing system corresponds to the contact mechanism a. The arc extinguishing system includes an arc extinguishing cover 42 and two spaced-apart grid groups 41. An arc entrance 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 entrance port 401. An arc running channel 402 connected to the arc entrance port 401 is formed between the two grid groups 41.

[0108] In this embodiment, it is preferred that the ends of the two grid groups 41 away from the arc entrance 401 are short-circuited at the same potential. In this way, when the arc current wants to form a loop, it must break down all the arc-extinguishing grids 411 of each grid group 41. The two grid groups 41 jointly limit the current, so that the arc-extinguishing grids 411 are fully utilized, thereby improving the arc-extinguishing capability of the arc-extinguishing system.

[0109] Furthermore, the arc extinguishing system also includes a shorting plate 44 (see Figures 25 and 26) or a connecting grid group 41. The shorting plate 44 or the connecting grid group 41 is disposed within the arc running channel 402, so that the two grid groups 41 at the end away from the arc inlet 401 are short-circuited to the same potential through the shorting plate 44 or the connecting grid group 41. The shorting plate 44 is relatively small and is suitable for contact units with small internal spaces. The connecting grid group 41 occupies more space but also has the function of cutting the arc, resulting in a better arc extinguishing effect. Alternatively, the shorting plate 44 or the connecting grid group can be omitted, and the two grid groups can be directly connected by the tail grid at the end away from the arc inlet 401 to achieve the same potential shorting, which is also applicable.

[0110] Furthermore, as shown in Figures 23 and 24, the arc extinguishing system further includes at least two magnetic conductive plates 43. The arc running channel 402 is located between the at least two magnetic conductive plates 43, and the magnetic conductive plates 43 form a magnetic field in the arc running channel 402. Thus, two grid groups 41 are disposed within the relatively closed arc extinguishing hood 42, and the arc running channel 402 between the two grid groups 41 is correspondingly located between the magnetic conductive plates 43. The magnetic conductive plates 43 form a magnetic field within the arc running channel 402, which facilitates blowing the arc toward the grid group 41. The relatively closed arc extinguishing hood 42 can prolong the time the arc and the grid group 41 cooperate, thereby improving the arc extinguishing effect.

[0111] Furthermore, each magnetic conductive plate 43 is disposed along one side of the arc-exiting channel 402 in a manner conforming to the sidewall of the arc-exiting hood 42, and the width of each magnetic conductive plate 43 is approximately equal 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 embedded in the sidewall of the arc-exiting hood 42 or conforming to the inner or outer surface of the sidewall of the arc-exiting hood 42. Smaller magnetic plates 43 are advantageous in reducing costs. Of course, when the magnetic conductive plates 43 are larger, it is preferred to dispose the magnetic conductive plates 43 on the outer surface of the sidewall of the arc-exiting hood 42.

[0112] In addition, two grid groups 41 can be assembled together in an arc extinguishing cover 42 to form an arc extinguishing chamber 40, or two grid groups 41 can be assembled respectively in two arc extinguishing covers 42 to form two independent arc extinguishing chambers 40, which can meet the needs of products with different requirements.

[0113] A first embodiment of an arc extinguishing system is provided in conjunction with Figures 1 and 23-31.

[0114] As shown in Figure 23-31, 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 inlet 401 is opened 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 apart and arranged on one side of the arc inlet 401. The gap between the two grid groups 41 serves as an arc running channel 402 connected to the arc inlet 401. The short-circuit plate 44 is arranged at one end of the arc running channel 402 away from the arc inlet 401. The short-circuit plate 44 connects the two grid groups 41 at one end away from the arc entrance 401 with the same potential. A pair of magnetic conductive plates 43 are arranged at intervals. The arc running channel 402 is located between the 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. The magnetic conductive plate 43 can be selectively embedded in the side wall of the arc extinguishing cover 42. Preferably, the magnetic conductive plate 43 is arranged on the outer wall of the arc extinguishing cover 42 for easy disassembly and assembly.

[0115] As shown in Figures 25-28, the arc extinguishing cover 42 includes two spaced-apart cover bodies 421, which together form a hollow cavity with open ends. In the figure, the arc extinguishing cover 42 is in the shape of a "□". At this time, an arc extinguishing cavity with open ends is formed inside the arc extinguishing cover 42, and one open end of the arc extinguishing cavity serves as the arc entrance port 401. The other open end opposite to the arc entrance port 401 is closed by the outer shell 5, preferably when assembled in the outer shell 5, it is closed by the inner side wall of the outer shell 5. Of course, the other open end of the arc extinguishing cover 42 may also be closed by a partition plate arranged in the outer shell 5. Thus, the arc extinguishing cavity forms a relatively closed cavity, and a plurality of exhaust holes 423 are provided on the side wall of the arc extinguishing cover 42 adjacent to the arc entrance port 401, and the plurality of exhaust holes 423 are arranged at intervals in the direction away from the arc entrance port 401.

[0116] As shown in Figures 25, 26, and 29, two grid groups 41 are disposed within the arc extinguishing hood 42. Each grid group 41 includes a plurality of spaced arc extinguishing grids 411. An arc extinguishing gap is formed between adjacent arc extinguishing grids 411, at least a portion of which is connected to the exhaust hole 423. An arc extinguishing notch 412 is defined at one end of each arc extinguishing grid 411. The arc extinguishing notches 412 of the same grid group 41 are connected to form an arc extinguishing trough 410. The arc extinguishing trough 410 faces the arc escape channel 402, and one end of the arc extinguishing trough 410 is connected to the arc inlet 401. The arc extinguishing troughs 410 of the two grid groups 41 are spaced and opposed to each other. In this embodiment, each arc extinguishing notch 412 extends away from the opening direction and in a direction offset from the axis, forming a "Y" shape. The extensions 304 of adjacent arc extinguishing notches 412 are staggered, which facilitates improving the arc cutting performance of the arc extinguishing grids 411. Of course, each grid group 41 can utilize existing technology.

[0117] Two installation areas are provided in the arc extinguishing chamber, and the two installation areas are spaced apart from each other. Each installation area is equipped with a corresponding grid group 41. Preferably, each installation area includes a plurality of grid slots 424 arranged at intervals. The grid slots 424 and the exhaust holes 423 are respectively located on the side walls adjacent to the arc extinguishing cover 42, and an arc extinguishing grid 411 is correspondingly inserted in each grid slot 424.

[0118] In this embodiment, as shown in FIGS. 23-28, docking portions 422 are provided at both side edges of each cover body 421. After the docking portions 422 are provided, the overall shape of the cover body 421 is "U". A plurality of spaced-apart grid-slot 424 are provided in the middle of the same cover body 421. The side walls of the arc extinguishing cover 42 for opening the exhaust holes 423 are formed by the cooperation of the docking portions 422 on the same side of the two cover bodies 421. In FIGS. 23-28, a plurality of opening slots serving as the exhaust holes 423 are spaced apart at the edges of each docking portion 422, and the plurality of exhaust holes 423 are arranged at equal intervals. When the docking portions 422 of the two cover bodies 421 are docked, the exhaust holes 423 of the two docking portions 422 on the same side are arranged in a staggered manner. Thus, 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 portion 422 may also be through holes 1121.

[0119] Of course, docking portions 422 are respectively provided at both side edges of one of the cover bodies 421, making the overall shape of the cover body 421 "U", and the other cover body 421 is not provided with docking portions 422 and has an overall shape of "-". It is also possible to enclose and form an arc extinguishing cover 42 with both ends open. At this time, exhaust holes 423 are provided in the middle of each docking portion 422, and adjacent two exhaust holes 423 are arranged in a staggered and opposite manner; or, docking portions 422 are provided on one side of each cover body 421, making the overall shape of each cover body 421 shaped, and a plurality of exhaust holes 423 are provided in the docking portions 422 of each cover body 421.

[0120] As shown in FIGS. 25, 26 and 30, the shorting plate 44 is located at one end of the arcing channel 402 away from the arc inlet 401. The two pins 441 of the shorting plate 44 are respectively close to one end of the two grid groups 41 away from the arc inlet 401, so that the electrical gap between one end of the two grid groups 41 away from the arc inlet 401 is smaller than the minimum physical distance between the two grid groups 41. That is, the distance between one end of each grid group 41 away from the arc inlet 401 and one pin 441 is smaller than the minimum physical distance between the two grid groups 41, so that the arc current needs to flow through the shorting plate 44 to form a loop, thereby realizing the equipotential shorting of one end of the two grid groups 41 away from the arc inlet 401. Further, the shorting plate 44 further includes an arc-igniting plate 442. The arc-igniting plate 442 is connected to the two pins 441 and extends along the center line of the arcing channel 402 towards the direction close to the arc inlet 401. The arc-igniting plate 44z is used to bridge the arc.

[0121] As shown in Figures 25, 26 and 30, the short-circuit plate 44 includes two arc-striking plates, one end of the two arc-striking plates are fitted together to form an arc-striking plate 442, and a notch is provided at the end of the arc-striking plate 442. The notch is located between the two grid groups 41 and serves as a connection. The middle parts of the two arc-striking plates are respectively deflected to both sides to form deflection segments, and the end of each deflection segment is bent to form a pin 441, so that the short-circuit plate 44 as a whole presents a "human" shape. Each pin 441 is spaced apart from the arc-extinguishing grid 411 at one end of a grid group 41 away from the arc entrance 401, and the gap between the pin 441 and the arc-extinguishing grid 411 is much smaller than the spacing between the two grid groups 41. In the figure, each pin 441 is spaced apart from the arc-extinguishing notch 412 of the arc-extinguishing grid 411 of the grid group 41 away from the arc entrance 401.

[0122] Furthermore, as shown in Figures 25, 26 and 28, 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 Figure 28, the short-circuit plate mounting portion includes a first boss 4261 and a second boss 4261 that are spaced apart. The bosses 4262, of which the first boss 4261 is located at the end of the arc running channel 402 close to the arc inlet 401, and the second boss 4262 is located at the end of the arc running channel 402 away from the arc inlet 401. The shorting plate 44 is limitedly assembled between the first boss 4261 and the second boss 4262. In the figure, the first boss 4261 has a notch on the side facing the second boss 4262, which engages with the arc-starting plate 442 of the shorting plate 44. The second boss 4262 is triangular in shape and is used to separate and limit the two pins 441 of the shorting plate 44, so that the two pins 441 of the shorting plate 44 extend toward the two grid groups 41. Of course, the shorting plate 44 can also be assembled to the arc extinguishing cover 42 in other ways.

[0123] In addition, a pair of magnetic conductive plates 43 are spaced apart from each other, and 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 perpendicular to the direction of the connection between the two grid groups 41, so as to accelerate the introduction of the arc into the two grid groups 41.

[0124] As shown in Figures 23, 24 and 27, 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 chamber. In this 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 Figure 27, 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 431 of the magnetic plate 43. In Figures 23, 24 and 31, the magnetic plate 43 is a rectangular plate structure, and two fastening grooves 431 are opened in the middle of the magnetic plate 43. Of course, the fastening boss 4252 may not be provided, and the magnetic conductive plate 43 may be directly embedded in or bonded to the magnetic conductive plate mounting groove 4251 .

[0125] In addition, the arc extinguishing cover 42 can also be provided with a limiting assembly structure so that the arc extinguishing cover 42 can be stably assembled in the housing 5 of the contact unit. In Figures 23, 24, 27 and 28, a snap-fit ​​groove 427 is provided at the edge of the arc extinguishing cover 42 away from the arc entrance 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 (not shown) in the housing 5 to achieve stable assembly. Of course, the limiting assembly structure can also be omitted and the cover can be directly assembled using fasteners such as screws.

[0126] A second embodiment of an arc extinguishing system is provided (not shown).

[0127] The arc extinguishing system includes an arc extinguishing cover 42, two grid groups 41 and a pair of magnetic conductive plates 43, wherein the structures of the arc extinguishing cover 42, the grid groups 41 and the magnetic conductive plates 43 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 instead has a connecting grid group provided between the two grid groups 41. The connecting grid group is provided at one end of the arc running channel 402 away from the arc entrance 401, and the two ends of the connecting grid group are respectively spaced opposite to the end of each grid group 41 away from the arc entrance 401, so that the electrical gap between the ends of the two grid groups 41 away from the arc entrance 401 is less than the minimum physical gap between the two grid groups 41. That is, the distance between the end of each grid group 41 away from the arc entrance 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 401, is less than the minimum physical gap between the two grid groups 41.

[0128] Specifically, the connecting grid group includes a plurality of connecting grids arranged at intervals. The connecting grid close to the grid group 41 is spaced apart from the arc extinguishing grid 411 at the end of the grid group 41 away from the arc entrance port 401. Thus, the ends of the two grid groups 41 away from the arc entrance port 401 are short-circuited at the same potential through the connecting grid group. In this embodiment, the structure of the connecting grid is preferably the same as that of the arc extinguishing grid 411 of the grid group 41. Correspondingly, an arc extinguishing notch 412 is also provided at one end of each connecting grid. The arc extinguishing notch 412 of the connecting grid group 41 is connected and respectively connected to the arc extinguishing grooves 410 of the two grid groups 41.

[0129] In this embodiment, the connecting grid group is arranged along a straight line connecting the two grid groups 41, thereby 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, preferably, the concave surface of the arc line faces the arc entrance 401, thereby, the two grid groups 41 and the connecting grid group 41 also form a "U"-shaped structure in the arc extinguishing cover 42, or the connecting grid group 41 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 401 gradually decreases, thereby, the two grid groups 41 and the connecting grid group 41 form a "W"-shaped structure in the arc extinguishing cover 42.

[0130] A third embodiment of an arc extinguishing system is provided (not shown).

[0131] 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 provided 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.

[0132] Preferably, one end of each tail grid plate close to the arc running channel 402 is bent toward the arc entrance 401 , thereby forming an arc starting portion protruding toward the arc entrance 401 when the two tail grid plates are connected. The arc starting portion has a V-shaped structure for bridging the arc.

[0133] A fourth embodiment of an arc extinguishing system is provided (not shown).

[0134] The arc extinguishing system includes two arc extinguishing covers 42 and two grid groups 41. Each grid group 41 adopts the grid group 41 of the first embodiment. The two grid groups 41 are respectively arranged in the two arc extinguishing covers 42. The two arc extinguishing covers 42 have openings on opposite sides. The arc extinguishing groove 410 of each grid group 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. 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. The arc running channel 402 and the openings of the two arc extinguishing covers 42 are interconnected. 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 be coordinated with the partition in the contact unit or the separately provided connecting plate to make the arc extinguishing cover 42 form 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 multiple exhaust holes 423, and the two adjacent exhaust holes 423 are also staggered relative to each other.

[0135] A short-circuit plate 44 identical to that of the first embodiment is provided 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 at the same potential. At this time, the arc extinguishing system includes two arc extinguishing chambers 40, and the short-circuit plate 44 is provided between the openings of the two arc extinguishing covers 42, wherein the short-circuit plate 44 can adopt the structure of the first embodiment, 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 on the arc starting plate 442 can connect the two arc extinguishing covers 42.

[0136] 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 is provided in the connecting arc extinguishing chamber. The connecting grid group short-circuits the ends of the two grid groups 41 away from the arc entrance 401 to the same potential. In this case, the arc extinguishing system includes two arc extinguishing chambers 40 and one connecting arc extinguishing chamber.

[0137] Of course, the third embodiment may also adopt 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 starting portion in the arc running channel 402 .

[0138] In this embodiment, the arc extinguishing system also includes a pair of magnetic plates 43, wherein the magnetic plates 43 are arranged outside the two arc extinguishing covers 42 and the projection of the magnetic plates 43 covers the arc running channel 402. The structure of the magnetic plates 43 is also rectangular. Preferably, magnetic plate mounting grooves 4251 are respectively provided on the outer side walls of the two arc extinguishing covers 42, and a fastening boss 4252 is respectively provided at the bottom of each magnetic plate mounting groove 4251. The fastening boss 4252 is limited and matched with the fastening groove 431 of the magnetic plate 43, and its specific position is adjusted according to actual needs. Of course, the magnetic plate 43 and the arc extinguishing cover 42 can also be matched in other ways.

[0139] As shown in Figures 32 and 33, 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.

[0140] In the embodiments of the above-mentioned arc extinguishing system, as shown in Figures 1-5, 32 and 33, each arc extinguishing system also includes two buffer zones 45. In the second 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 provided in the buffer zone 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 in use.

[0141] 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 improve their buffering effect in a limited space and help reduce the area of ​​the buffer zone 45. Furthermore, a baffle 52 is provided around the outside 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 avoid the 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.

[0142] It should be noted that, in the description of the present invention, the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are conventionally placed in use. They are intended solely for ease of description and do not necessarily require the devices or components referred to to have a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third," etc., are used solely for distinction and description and should not be construed as indicating relative importance.

[0143] The above is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific implementation of the present invention should not be considered to be limited to these descriptions. For those skilled in the art of the present invention, without departing from the concept of the present invention, several simple deductions or substitutions can be made, which should be considered to fall within the scope of protection of the present invention.

Claims

1. A contact unit, comprising a housing (5) and a contact mechanism (a) arranged in the housing (5), wherein the contact mechanism (a) comprises a pair of stationary contact assemblies (2) and a movable contact assembly (1), each stationary contact assembly (2) comprising a stationary contact portion (21), and an arc extinguishing system is arranged on both sides of the contact mechanism (a), characterized in that: The arc extinguishing system comprises an arc extinguishing hood (42), one end of the arc extinguishing hood (42) serving as an arc inlet (401); The contact mechanism (a) further comprises a shell (3), the housing cavity of the shell (3) being provided with two opposite openings, each opening being respectively connected to an arc entry opening (401), the moving contact assembly (1) and the static contact portion (21) being assembled in the housing cavity, and the moving contact assembly (1) being located between a pair of static contact portions (21), and the contact mechanism (a) and the arc extinguishing systems on both sides jointly forming a relatively closed space.

2. The contact unit according to claim 1, characterized in that: The arc extinguishing hood (42) is open at both ends, one open end serves as an arc entrance (401), and the other open end is abutted against the housing (5) and closed; or the arc extinguishing hood (42) is open at one end and closed at the other end, and the open end serves as the arc entrance (401).

3. The contact unit according to claim 1, characterized in that: The moving contact assembly (1) comprises a rotating shaft (11) and a moving contact bridge (12) radially arranged along the rotating shaft (11); the rotating shaft (11) is rotatably located between a pair of static contact parts (21); two ends of the moving contact bridge (12) respectively serve as moving contact parts (120) for cooperating with the static contact parts (21); the moving contact assembly (1) cooperates with the accommodating cavity to block two openings from being connected to each other.

4. The contact unit according to claim 3, characterized in that: The circumferential side wall of the rotating shaft (11) is protruded with two opening gate limiting parts (115), and the accommodating chamber is provided with two opening gate blocking parts (32). The opening gate blocking parts (32) are located on the rotation trajectory of the opening gate limiting parts (115), and each opening gate limiting part (115) is adjacent to a dynamic contact part (120). When the rotating shaft (11) rotates to the opening gate position, the opening gate limiting parts (115) and the opening gate blocking parts (32) are limited and matched, and the rotating shaft (11), the two opening gate limiting parts (115) and the two opening gate blocking parts (32) block the two openings from being connected to each other.

5. The contact unit according to claim 4, characterized in that: A static contact portion (21) and a gate-opening barrier portion (32) are respectively located on two sides of a same opening of a housing (3); a dynamic contact portion (120) and a gate-opening limiting portion (115) rotate together between the static contact portion (21) and the gate-opening barrier portion (32); and the gate-opening limiting portion (115) is located on a side of the dynamic contact portion (120) that is opposite to the static contact portion (21).

6. The contact unit according to claim 4, characterized in that: The shell (3) is an integral structure; or, the shell (3) comprises two plates (301) spaced apart from each other, the two plates (301) together forming a hollow cavity with two ends open, the hollow portion of the hollow cavity serving as a receiving cavity, and a mutually matching splicing structure being provided between the two plates (301), the splicing structure enabling the two plates (301) to form a whole that can be plugged in and out and disassembled.

7. The contact unit according to claim 6, characterized in that: The housing (3) comprises two plates (301) spaced apart from each other, with extension portions (304) being provided at both side edges of each plate (301), the extension portions (304) on the same side of the two plate bodies (301) cooperating to form a connecting wall (303) of the housing (3), each connecting wall (303) being provided with a mounting groove (31) and a gate-breaking barrier portion (32), and the middle portions of the two plate bodies (301) serving as a pair of supporting walls (302).

8. The contact unit according to claim 2, characterized in that: The arc extinguishing system further comprises a buffer zone (45), both ends of the arc extinguishing cover (42) are open, one open end of the arc extinguishing cover (42) serves as an arc entrance opening (401), a plurality of exhaust holes (423) are provided on a side wall of the arc extinguishing cover (42) adjacent to the arc entrance opening (401), the arc entrance opening (401) is connected to the contact mechanism (a) in a 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 the exhaust holes (423), and the first direction is perpendicular to the second direction.

9. The contact unit according to claim 8, characterized in that: Each of the arc extinguishing systems comprises two buffer zones (45), wherein the two buffer zones (45) are located on both sides of the arc extinguishing cover (42) in the second direction, and the buffer zones (45) are provided with a plurality of columns (451) opposite to the exhaust holes (423) along a third direction, and the third direction is respectively perpendicular to the first direction and the second direction.

10. The contact unit according to claim 9, characterized in that: A baffle (52) is also arranged around the outer side of the arc extinguishing chamber (40), and the baffle (52) and the exhaust hole (423) of the arc extinguishing chamber (40) are spaced and opposed to each other, so that the space of the shell (5) between the baffle (52) and the exhaust hole (423) forms a buffer zone (45), and the plurality of columns (451) are arranged in at least two rows, and the plurality of columns (451) in each row are arranged at equal intervals along a first direction, and the columns (451) in two adjacent rows are staggered and opposed.

11. The contact unit according to claim 9, characterized in that: The arc extinguishing system comprises an arc extinguishing chamber (40), wherein the arc extinguishing chamber (40) comprises an arc extinguishing hood (42) and two grid sheet groups (41) arranged at intervals in the same arc extinguishing hood (42), and an arc running channel (402) communicating with an incoming arc (401) is arranged between the two grid sheet groups (41); or, the arc extinguishing system comprises two arc extinguishing chambers (40), each arc extinguishing chamber (40) comprises an arc extinguishing hood (42) and a grid sheet group (41) arranged in the arc extinguishing hood (42). A grid plate group (41), each arc extinguishing cover (42) is provided with an opening on one side adjacent to an arc entry port (401), the openings of the two arc extinguishing covers (42) are opposite to each other, the arc extinguishing groove (410) of each grid plate group (41) is connected to the arc entry port (401), and the arc extinguishing groove (410) of each grid plate group (41) is respectively opposite to the opening, and the interval between the two grid plate groups (41) forms an arc running channel (402) connected to the arc entry port (401).

12. The contact unit according to claim 11, characterized in that: The arc extinguishing system further comprises a short-circuit plate (44), the short-circuit plate (44) being arranged at one end of the arc running channel (402) away from the arc entrance port (401), the short-circuit plate (44) comprising two pins (441) and an arc-starting plate (442), the two pins (441) respectively extending towards one end of the two grid plate groups (41) away from the arc entrance port (401), so that the electrical gap between the two grid plate groups (41) away from the arc entrance port (401) is smaller than the minimum physical distance between the two grid plate groups (41), and the arc-starting plate (442) extends along the center line of the arc running channel (402) towards the arc entrance port (401).

13. The contact unit according to claim 11, characterized in that: An arc extinguishing grid piece of each grid piece group (41) away from the arc entrance opening (401) is a tail grid piece, the tail grid pieces of the two grid piece groups (41) are connected, and the tail grid pieces of the two grid piece groups (41) protrude toward the arc entrance opening (401) to form an arc starting portion for bridging the electric arc; Alternatively, a connecting grid group is provided at one end of the arc running channel (402) away from the arc entrance (401), wherein the connecting grid group comprises a plurality of connecting grids arranged at intervals, and the plurality of connecting grids are arranged along a straight line, an arc line or a folded line connecting two grid groups (41).

14. The contact unit according to claim 11, characterized in that: The arc extinguishing system further comprises at least two magnetic conductive plates (43) arranged at intervals, each magnetic conductive plate (43) being arranged outside the arc extinguishing cover (42), the arc running channel (402) being located between at least two magnetic conductive plates (43), and the magnetic conductive plates (43) forming a magnetic field in the arc running channel (402).

15. A rotary 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 14, and the operating mechanism of the operating module drives at least one contact unit to open and close the switch.

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