Arc extinguishing system

Abstract

An arc extinguishing system comprises an arc extinguishing cover and two grid sheet groups opposite to each other at intervals, one end of the arc extinguishing cover is open and serves as an arc inlet, the other end, opposite to the arc inlet, of the arc extinguishing cover is closed, each grid sheet group is arranged in the arc extinguishing cover on one side of the arc inlet, and an arc running channel communicated with the arc inlet is formed between the two grid sheet groups; the arc extinguishing device further comprises at least two magnetic conductive plates arranged on the outer side of the arc extinguishing cover at intervals, and the magnetic conductive plates form a magnetic field in the arc running channel. According to the arc extinguishing system, the two grid sheet groups are arranged in the relatively closed arc extinguishing cover, the arc running channel between the two grid sheet groups is correspondingly located between the magnetic conductive plates, the magnetic conductive plates form a magnetic field in the arc running channel, electric arcs can be blown to the grid sheet groups, the relatively closed arc extinguishing cover can prolong the matching time of the electric arcs and the grid sheet groups, and the arc extinguishing efficiency is improved. And the magnetic conductive plate is arranged on the outer side of the arc extinguishing cover, so that the movement of the electric arc in the arc extinguishing cavity is prevented from being influenced.

Description

Technical Field

[0001] The present invention relates to the field of switch electrical appliances, and in particular to an arc extinguishing system. Background Art

[0002] A switchgear is a device used to connect or disconnect a circuit. When the switchgear is opened, the air medium between the moving contact assembly and the static contact assembly of its contact mechanism discharges under the action of voltage, thereby generating an arc and high-temperature gas. Usually, an arc extinguishing system is configured in the switchgear to extinguish the arc when the contact mechanism is disconnected. Therefore, the arc extinguishing capacity of the arc extinguishing system directly determines the performance of the disconnector.

[0003] Therefore, to improve the breaking capacity of circuit breakers, the arc voltage within the arc extinguishing chamber during short-circuit interruption is typically increased. Increasing the number of arc quenching grids within the arc quenching chamber is the most effective method. However, as circuit breakers evolve towards miniaturization and high performance, the arc quenching chamber is limited by the internal space of the circuit breaker. Simply increasing the number of arc quenching grids results in insufficient thickness and spacing between the grids, resulting in poor arc extinguishing performance. Summary of the Invention

[0004] The object of the present invention is to overcome at least one defect of the prior art and to provide an arc extinguishing system with a simple structure, high reliability and good arc extinguishing effect.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] The present invention provides an arc extinguishing system, comprising an arc extinguishing hood and two spaced-apart grid groups, wherein one end of the arc extinguishing hood is open and serves as an arc entrance, and the other end of the arc extinguishing hood opposite to the arc entrance is closed, each grid group is arranged in the arc extinguishing hood on one side of the arc entrance, and an arc running channel connected to the arc entrance is formed between the two grid groups; and the system also comprises at least two magnetic conductive plates spaced-apart and arranged outside the arc extinguishing hood, and the magnetic conductive plates form a magnetic field in the arc running channel.

[0007] Preferably, each magnetic conductive plate is arranged on the outer side wall of the arc extinguishing cover along one side of the arc running channel, and the width of each magnetic conductive plate is equal to the distance between the two grid groups.

[0008] Preferably, the two grid groups and the arc running channel are located in the same arc extinguishing hood, and the magnetic conductive plate is arranged on the outer side wall of the arc extinguishing hood corresponding to the arc running channel.

[0009] Preferably, two installation areas are provided in the arc extinguishing hood, each installation area is equipped with a corresponding grid group, an arc running channel is formed between the two installation areas, and a magnetic plate installation portion is provided on the outer surface of the arc extinguishing hood corresponding to the arc running channel.

[0010] Preferably, the magnetic conductive plate mounting portion includes a magnetic conductive plate mounting groove, a fastening boss is protruding from the bottom of the magnetic conductive plate mounting groove, and a fastening groove is provided in the middle of the magnetic conductive plate to be plugged into the fastening boss.

[0011] Preferably, there are two arc extinguishing covers, and openings are provided on opposite sides of the two arc extinguishing covers. Each grid group is respectively assembled in an arc extinguishing cover, and the arc extinguishing groove of each grid group is opposite to the opening. An arc running channel is formed between the two arc extinguishing grooves, and the magnetic conductive plate is arranged outside the two arc extinguishing covers and the projection of the magnetic conductive plate covers the arc running channel.

[0012] Preferably, the arc extinguishing cover comprises two cover bodies spaced apart and facing each other, and the two cover bodies enclose an arc extinguishing cavity with two open ends, wherein one open end serves as an arc entrance and the other open end is closed.

[0013] Preferably, both side edges of each cover body are provided with butt joints, and the butt joints on the same side of the two cover bodies cooperate to form a side wall of the arc extinguishing cover adjacent to the arc inlet.

[0014] Preferably, the grid group includes a plurality of arc-extinguishing grids arranged at intervals, an arc-extinguishing gap is formed between two adjacent arc-extinguishing grids, an arc-extinguishing notch is provided at one end edge of each arc-extinguishing grid, all arc-extinguishing notches are connected to form an arc-extinguishing groove of the grid group, and a plurality of exhaust holes are provided on the side wall of the arc-extinguishing cover adjacent to the arc entrance, and at least some of the arc-extinguishing gaps are connected to the exhaust holes.

[0015] Preferably, the two grid groups are short-circuited at the same potential at one end away from the arc entrance.

[0016] Preferably, it further includes a connecting grid group, which is arranged at one end of the arc running channel away from the arc entrance. The two ends of the connecting grid group are respectively spaced opposite to the end of each grid group away from the arc entrance, so that the distance between the end of each grid group away from the arc entrance and one end of the connecting grid group is less than the minimum physical distance between the two grid groups.

[0017] Preferably, the connecting grid group includes a plurality of connecting grids arranged at intervals, and the connecting grids close to the grid group are spaced opposite to the arc extinguishing grids at one end of the grid group away from the arc inlet.

[0018] Preferably, the plurality of connecting grids are arranged along a straight line, an arc line or a fold line connecting two grid group.

[0019] Preferably, an arc extinguishing grid away from the arc entrance of each grid group is a tail grid, and the tail grids of the two grid groups are connected.

[0020] The arc extinguishing system of the present invention is equipped with two grid groups in a relatively closed arc extinguishing cover. The arc running channel between the two grid groups is located correspondingly between the magnetic conductive plates. The magnetic conductive plates form a magnetic field in the arc running channel, which is conducive to blowing the arc toward the grid group. The relatively closed arc extinguishing cover can extend the coordination time between the arc and the grid group, thereby improving its arc extinguishing effect. The magnetic conductive plates are arranged on the outside of the arc extinguishing cover to avoid affecting the movement of the arc in the arc extinguishing cavity.

[0021] In addition, the two grid groups can be assembled in the same arc-extinguishing hood, or respectively arranged in two arc-extinguishing hoods, and have a wide range of applications.

[0022] In addition, the two grid groups are short-circuited at the same potential at one end away from the arc inlet, so that the arc extinguishing grids of each grid group are fully utilized, thereby improving the arc extinguishing capability of the arc extinguishing system. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 1 is a schematic structural diagram of the arc extinguishing chamber of the present invention (first embodiment);

[0024] Figure 2 Schematic diagram of the structure of the arc extinguishing cover, magnetic conductive plate and grid group in the present invention (first embodiment);

[0025] Figure 3 Schematic diagram of the structure of the cover and the magnetic plate in the present invention (first embodiment);

[0026] Figure 4 Schematic diagram of the structure of the grid plate group and the cover body in the present invention (first embodiment);

[0027] Figure 5 It is a structural diagram of the grid plate group in the present invention;

[0028] Figure 6 It is a structural schematic diagram of the magnetic conductive plate in the present invention;

[0029] Reference numerals:

[0030] 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-jointing part, 423-exhaust hole, 424-grid slot, 4251-magnetic plate mounting groove, 4252-fastening boss, 427-clamping groove, 43-magnetic plate, 431-fastening groove. DETAILED DESCRIPTION

[0031] The following embodiments are given in conjunction with the accompanying drawings to further illustrate the specific implementation of the arc extinguishing system of the present invention. The arc extinguishing system of the present invention is not limited to the description of the following embodiments.

[0032] The switching device includes an operating module and a contact module, wherein the contact module is driven by the operating module to open and close the switch to connect or disconnect the circuit. The switching device can be an isolating switch, a circuit breaker, or other switching devices. When the switching device is an isolating switch, the operating module and the contact module are stacked, and at least one contact unit in the contact module is directly or indirectly driven by the operating mechanism of the operating module. When the switching device is a circuit breaker, each contact unit is a circuit breaker pole, which is arranged side by side with two circuit breaker poles apart. The operating module includes at least one operating mechanism, and all circuit breaker poles are driven by one operating mechanism, or the operating module includes an operating mechanism correspondingly arranged in each circuit breaker pole.

[0033] The arc extinguishing system is arranged on one side of the contact mechanism to extinguish the arc generated when the contact mechanism is opened. The arc entrance port 401 of the arc extinguishing system corresponds to the contact mechanism. The arc extinguishing system includes an arc extinguishing cover 42 and two spaced-apart grid groups 41. The grid group 41 is arranged in the arc extinguishing cover 42 on one side of the arc entrance port 401, and the arc entering the arc extinguishing cover 42 is cut by the grid group 41.

[0034] The improvement of the present application is that one end of the arc extinguishing hood 42 is open and serves as the arc entrance 401, and the other end of the arc extinguishing hood 42 opposite to the arc entrance 401 is closed. Each grid group 41 is arranged in the arc extinguishing hood 42 on one side of the arc entrance 401, and an arc running channel 402 connected to the arc entrance 401 is formed between the two grid groups 41; the arc extinguishing system also includes at least two magnetic conductive plates 43 spaced apart and arranged on the outer wall of the arc extinguishing hood 42, and the magnetic conductive plates 43 form a magnetic field in the arc running channel 402. In this way, two grid groups 41 are arranged in the relatively closed arc extinguishing hood 42, and the magnetic conductive plates 43 form a magnetic field in the arc running channel 402, which is conducive to blowing the arc toward the grid group 41. The relatively closed arc extinguishing hood 42 can prolong the coordination time between the arc and the grid group 41, thereby improving its arc extinguishing effect. The magnetic conductive plates 42 are arranged on the outside of the arc extinguishing hood 42 to avoid arc stagnation and avoid affecting the movement of the arc in the arc extinguishing cavity.

[0035] 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. 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 that the magnetic conductive plates 43 be disposed on the outer surface of the sidewall of the arc-exiting hood 42.

[0036] Preferably, the two grid groups 41 and the arc-running channel 402 are located within the same arc-extinguishing hood 42, and the magnetic conductive plate 43 is attached to the side wall of the arc-extinguishing hood 42 corresponding to the arc-running channel 402. Furthermore, the magnetic conductive plate 43 is attached to the outer wall of the arc-extinguishing hood 42, which facilitates assembly and avoids interfering with the arc's movement within the arc-extinguishing cavity. Of course, the magnetic conductive plate 43 can also be embedded in the inner wall of the arc-extinguishing hood 42, or disposed on the inner wall surface of the arc-extinguishing hood 42. However, when the magnetic conductive plate 43 is located within the arc-extinguishing cavity, it is easy to cause the arc to short-circuit with the magnetic conductive plate 43.

[0037] Preferably, one end of the two grid groups 41 away from the arc inlet 401 is short-circuited at the same potential, so that the arc extinguishing grid 411 of each grid group 41 is fully utilized, thereby improving the arc extinguishing capability of the arc extinguishing system.

[0038] Combine Figure 1-6 A specific embodiment of an arc extinguishing system is provided.

[0039] like Figure 1-4 As shown, the arc extinguishing system includes an arc extinguishing cover 42, two grid groups 41 and a pair of magnetic conductive plates 43. The two ends of the arc extinguishing cover 42 are open, wherein one open end of the arc extinguishing cover 42 serves as an arc inlet 401 for cooperating with the contact mechanism to introduce the arc into the arc extinguishing system, and the other open end opposite to the arc inlet 401 is closed. Preferably, the arc extinguishing system is assembled in the housing of the switch device and is closed by the side wall or partition plate of the housing to form a relatively closed arc extinguishing cavity. The two grid groups 41 are spaced opposite to each other and are respectively arranged on one side of the arc inlet 401. The two grid groups The gap between 41 serves as an arc running channel 402 and is connected to the arc entrance 401. 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 fitted on the outer wall of the arc extinguishing cover 42, which is convenient for disassembly and assembly, and will not interfere with the arc running in the arc extinguishing cavity.

[0040] Specific as Figure 1 、 2 As shown, the arc extinguishing cover 42 includes two cover bodies 421 that are spaced apart from each other, and a hollow cavity with open ends is formed by the two cover bodies 421. In the figure, the arc extinguishing cover 42 is in the shape of a "□" as a whole. 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 401. A plurality of exhaust holes 423 are provided on the side wall of the arc extinguishing cover 42 adjacent to the arc entrance 401, and the plurality of exhaust holes 423 are arranged at intervals in the direction away from the arc entrance 401.

[0041] In this embodiment, if Figure 2 、4 As shown in Figure 5 , 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 in a direction deviating from the axis, forming a "Y" shape. The extended portions 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.

[0042] 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.

[0043] In this embodiment, if Figure 2 、 4 As shown, each cover body 421 is provided with a butt joint 422 on both sides of the edge. After the butt joint 422 is provided, the cover body 421 is in a "U" shape. A plurality of grid slots 424 arranged at intervals are provided in the middle of the same cover body 421. The butt joints 422 on the same side of the two covers 421 cooperate to form a side wall of the arc extinguishing cover 42 for providing an exhaust hole 423. Figure 2 、 4 In the embodiment, a plurality of opening slots serving as exhaust holes 423 are spaced apart at the edge of each docking portion 422, and the plurality of exhaust holes 423 are arranged at equal intervals. When the docking portions 422 of two cover bodies 421 are docked, the exhaust holes 423 of the two docking portions 422 on the same side are staggered. This prevents arcs and arc particles from short-circuiting outside the arc extinguishing cover 42. Of course, the exhaust holes 423 provided on each docking portion 422 may also be through holes.

[0044] Of course, one of the cover bodies 421 is respectively provided with docking parts 422 on both side edges, so that the cover body 421 is "U"-shaped as a whole, and the other cover body 421 is not provided with the docking part 422 and is "—"-shaped as a whole. It can also be enclosed to form an arc extinguishing cover 42 with open ends. At this time, an exhaust hole 423 is opened in the middle of each docking part 422, and the two adjacent exhaust holes 423 are staggered relative to each other; or, a docking part 422 is provided on one side of each cover body 421, so that each cover body 421 is "∟"-shaped as a whole, and a plurality of exhaust holes 423 are opened in the docking part 422 of each cover body 421.

[0045] 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.

[0046] like Figure 3 As shown, a magnetic plate mounting portion is provided in the middle of each cover 421. Preferably, the magnetic plate mounting portion is located outside the arc extinguishing chamber. In this embodiment, the magnetic plate mounting portion is located on the outer surface of the cover 421, that is, it is provided on the outer surface of the two covers 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. Figure 3 The middle magnetic plate mounting grooves 4251 are provided on the outer surface of the cover 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. Figure 3 In the figure, the magnetic conductive plate 43 is a rectangular plate structure, and two fastening grooves 431 are provided in the middle of the magnetic conductive plate 43. Of course, the fastening boss 4252 may not be provided, and the magnetic conductive plate 43 may be directly embedded or bonded in the magnetic conductive plate mounting groove 4251.

[0047] 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 of the contact unit. Figure 2 、 3 In the figure, 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 of the disconnector, the snap-fit ​​groove 427 can be engaged with the snap-fit ​​part (not shown) in the housing to achieve stable assembly. Of course, a limit assembly structure can also be provided.

[0048] A second embodiment of the arc extinguishing system is provided (not shown), wherein the arc extinguishing system includes two arc extinguishing covers 42 and two grid groups 41. The two grid groups 41 are respectively arranged in the two arc extinguishing covers 42. Openings are provided on opposite sides of the two arc extinguishing covers 42. The arc extinguishing groove 410 of each grid group 41 is aligned with 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. At this time, the arc running channel 402 is not completely located in the same arc extinguishing cover 42. The magnetic conductive plate 43 is arranged outside the two arc extinguishing covers 42 and the projection of the magnetic conductive plate 43 covers the arc running channel 402.

[0049] It should be noted that, based on the above two embodiments, a connecting grid group can also be provided in the arc running channel 402. The connecting grid group is located at the end of the arc running channel 402 away from the arc entrance port 401. The connecting grid group short-circuits the ends of the two grid groups 41 away from the arc entrance port at the same potential. That is, 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 port 401, so that the distance between the end of each grid group 41 away from the arc entrance port 401 and one end of the connecting grid group is less than the minimum physical distance between the two grid groups 41.

[0050] Specifically, the connecting grid group includes a plurality of connecting grids arranged at intervals, wherein the connecting grid close to the grid group 41 is spaced opposite to the arc extinguishing grid 411 at the end of the grid group 41 away from the arc entrance port 401, wherein the spacing between the connecting grid closest to the grid group 41 and the arc extinguishing grid 411 of each grid group 41 away from the arc entrance port is smaller than the spacing between the two grid groups 41, thereby making the electrical gap between the two grid groups 41 smaller than the minimum spatial distance between the two grid groups 41 in the arc extinguishing cavity. Correspondingly, an arc extinguishing notch 412 is also provided at one end of each connecting grid, and the arc extinguishing notch 412 of the connecting grid group is connected and respectively connected to the arc extinguishing grooves 410 of the two grid groups 41.

[0051] 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 with the concave surface of the arc line facing the arc entrance 401, thereby the two grid groups 41 and the connecting grid group also form a "U"-shaped structure in the arc extinguishing cover 42. Alternatively, the connecting grid group can also be arranged along a fold line connecting the two grid groups 41, for example, along an inverted "V"-shaped fold line. Preferably, the interval between the two grid groups 41 away from the arc entrance 401 gradually decreases, thereby the two grid groups 41 and the connecting grid group form a "W"-shaped structure in the arc extinguishing cover 42.

[0052] When the connecting grid group is provided in the first embodiment, it is preferred that the connecting grid group and the two grid groups 41 are located in the same arc extinguishing cover 42. At this time, it can be considered that an overall "U"-shaped or "W"-shaped grid system is provided in the arc extinguishing cover 42; when the connecting grid group is applied to the second embodiment, it is preferred that the connecting grid group is separately provided in an arc extinguishing cover 42, and the arc extinguishing cover 42 used to assemble the connecting grid group adopts the arc extinguishing cover 42 in the second embodiment, that is, an opening is provided on one side of the arc extinguishing cover 42, and the opening of the arc extinguishing cover 42 is respectively connected to the openings of the other two arc extinguishing covers 42. At this time, the arc extinguishing system has three arc extinguishing covers 42, thereby forming three arc extinguishing chambers 40.

[0053] Of course, it is also possible not to set up a connecting grid group, and the two grid groups 41 can be directly short-circuited at the same potential at one end away from the arc entrance port 401. That is, an arc-extinguishing grid 411 of each grid group 41 away from the arc entrance port 401 serves as a tail grid, and the two tail grids of the two grid groups 41 are close to each other to achieve equipotential short-circuiting. Preferably, the spacing between the two tail grids is less than or equal to the arc-extinguishing gap. Furthermore, the end of each tail grid close to the arc running channel 402 is bent toward the arc entrance port 401. Therefore, when the two tail grids are connected, an arc-starting portion protruding toward the arc entrance port 401 is formed, and the arc-starting portion has a V-shaped structure for bridging the arc.

[0054] 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.

[0055] 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. An arc extinguishing system, comprising an arc extinguishing hood (42) and two grid groups (41) spaced apart and facing each other, characterized in that: One end of the arc extinguishing hood (42) is open and serves as an arc entrance opening (401), and the other end of the arc extinguishing hood (42) opposite to the arc entrance opening (401) is closed; each grid plate group (41) is arranged in the arc extinguishing hood (42) on one side of the arc entrance opening (401), and an arc running channel (402) communicating with the arc entrance opening (401) is formed between the two grid plate groups (41); It also comprises at least two magnetic conductive plates (43) arranged at intervals outside the arc extinguishing cover (42), and the magnetic conductive plates (43) form a magnetic field in the arc running channel (402).

2. The arc extinguishing system according to claim 1, characterized in that: Each magnetic conductive plate (43) is arranged along one side of the arc running channel (402) in close contact with the outer wall of the arc extinguishing cover (42), and the width of each magnetic conductive plate (43) is equal to the spacing between the two grid plate groups (41).

3. The arc extinguishing system according to claim 1 or 2, characterized in that: The two grid sheet groups (41) and the arc running channel (402) are located in the same arc extinguishing cover (42), and the magnetic conductive plate (43) is arranged on the outer side wall of the arc extinguishing cover (42) corresponding to the arc running channel (402).

4. The arc extinguishing system according to claim 3, characterized in that: Two installation areas are arranged in the arc extinguishing hood (42), each installation area is equipped with a corresponding grid plate group (41), an arc running channel (402) is formed between the two installation areas, and a magnetic conductive plate installation portion is provided on the outer surface of the arc extinguishing hood (42) corresponding to the arc running channel (402).

5. The arc extinguishing system according to claim 4, characterized in that: The magnetic conductive plate mounting portion comprises a magnetic conductive plate mounting groove (4251), a fastening boss (4252) is protruding from the bottom of the magnetic conductive plate mounting groove (4251), and a fastening groove (431) is provided in the middle of the magnetic conductive plate (43) for plugging into the fastening boss (4252).

6. The arc extinguishing system according to claim 1 or 2, characterized in that: There are two arc extinguishing covers (42), one side of the two arc extinguishing covers (42) being opposite to the other is provided with an opening, each grid plate group (41) is respectively mounted in one arc extinguishing cover (42), and the arc extinguishing groove (410) of each grid plate group (41) is opposite to the opening, an arc running channel (402) is formed between the two arc extinguishing grooves (410), and the magnetic conductive plate (43) is arranged outside the two arc extinguishing covers (42), and the projection of the magnetic conductive plate (43) covers the arc running channel (402).

7. The arc extinguishing system according to claim 1 or 2, characterized in that: The arc extinguishing cover (42) comprises two cover bodies (421) spaced apart from each other, and the two cover bodies (421) enclose an arc extinguishing cavity with two open ends, wherein one open end serves as an arc entrance (401) and the other open end is closed.

8. The arc extinguishing system according to claim 7, characterized in that: A butt joint (422) is provided on both side edges of each cover body (421), and the butt joint (422) on the same side of the two cover bodies (421) cooperate to form a side wall of the arc extinguishing cover (42) adjacent to the arc inlet (401).

9. The arc extinguishing system according to claim 1 or 2, characterized in that: The grid plate group (41) comprises a plurality of arc-extinguishing grid plates (411) arranged at intervals, an arc-extinguishing gap is formed between two adjacent arc-extinguishing grid plates (411), an arc-extinguishing notch (412) is provided at one end edge of each arc-extinguishing grid plate (411), all arc-extinguishing notches (412) are connected to form an arc-extinguishing groove (410) of the grid plate group (41), a plurality of exhaust holes (423) are provided on the side wall of the arc-extinguishing cover (42) adjacent to the arc inlet (401), and at least part of the arc-extinguishing gap is correspondingly connected to the exhaust holes (423).

10. The arc extinguishing system according to claim 1, characterized in that: The two grid plate groups (41) have one end away from the arc entrance (401) short-circuited at the same potential.

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