Arc extinguishing system and circuit breaker

Abstract

The arc extinguishing system comprises an arc extinguishing chamber, the arc extinguishing chamber comprises an arc extinguishing cavity and two grid sheet systems arranged in the arc extinguishing cavity, the two grid sheet systems are opposite to each other at intervals in a second direction and form an arc running channel which is communicated with an arc inlet and extends along a first direction, and the first direction is perpendicular to the second direction. The arc striking connecting piece is arranged at one end, far away from the arc inlet, of the arc running channel, and the tail ends, far away from the arc inlet, of the two grid plate systems are connected in series through the arc striking connecting piece. According to the arc extinguishing system and the circuit breaker, the two grid sheet systems opposite to each other at intervals are arranged in the arc extinguishing cavity, so that the arc extinguishing chamber has more arc extinguishing grid sheets in a limited space, meanwhile, the tail ends, far away from the arc inlet, of the two grid sheet systems are connected in series through the arc striking connecting piece, and the utilization rate and the arc extinguishing effect of the grid sheet systems are improved.

Description

Technical Field

[0001] The invention relates to the field of low-voltage electrical appliances, and in particular to an arc extinguishing system and a circuit breaker. Background Art

[0002] A circuit breaker is a device that plays an electrical protection role in a circuit. During the breaking process, the air medium between the moving and static contacts discharges under the action of voltage, thereby generating an arc, and high-temperature gas is generated during the breaking process. An arc extinguishing chamber is usually configured in the circuit breaker to extinguish the arc. As an important component of the circuit breaker, the arc extinguishing ability of the arc extinguishing chamber directly determines the performance of the entire circuit breaker in breaking overload and short-circuit current.

[0003] In existing products, the arc extinguishing chamber is usually simply composed of a number of arc extinguishing grids and an arc extinguishing cover that wraps all the arc extinguishing grids. The arc enters the arc extinguishing chamber from the position where the moving contact contacts the static contact. Driven by the magnetic field and fluid effect of the arc extinguishing chamber, the arc is divided into multiple short arcs by multiple arc extinguishing grids to achieve the arc extinguishing effect. However, as circuit breakers gradually develop in the direction of miniaturization and high performance, existing arc extinguishing chambers have the following defects: First, the arc extinguishing chamber is limited by the internal space of the circuit breaker, and the thickness and spacing of the arc extinguishing grids cannot be guaranteed by simply increasing the number of arc extinguishing grids; second, some grids are prone to short-circuiting or not being fully utilized during the breaking process, resulting in poor arc extinguishing effect; third, limited by the contact mechanism and the arc inlet structure of the arc extinguishing chamber, the efficiency of introducing the arc into the arc extinguishing chamber is low. 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 and a circuit breaker with a simple structure, a large number of arc extinguishing grids and good arc striking and arc extinguishing effects.

[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 chamber, wherein the arc extinguishing chamber comprises an arc extinguishing cavity and two grid systems arranged in the arc extinguishing cavity, wherein the two grid systems are spaced opposite to each other in a second direction and form an arc running channel extending along a first direction and connected to an arc entrance port, wherein the first direction is perpendicular to the second direction, and further comprises an arc striking connector, wherein the arc striking connector is arranged at one end of the arc running channel away from the arc entrance port, and the tail ends of the two grid systems away from the arc entrance port are connected in series by the arc striking connector.

[0007] Furthermore, each grid system includes a grid group, each grid group includes a plurality of arc-extinguishing grids arranged at intervals along a first direction, the arc-extinguishing grid away from the arc entrance end is a tail grid, the tail grid and an arc-striking end of the arc-striking connecting piece are spaced opposite to each other in the first direction, and the spacing between the tail grid and the arc-striking end is smaller than the spacing between the two grid groups in the second direction.

[0008] Furthermore, each grid plate system includes at least two grid plate groups arranged along the first direction. In the same grid plate system, the grid plate group close to the arc entrance port is the first grid plate group, and the grid plate group away from the arc entrance port is the second grid plate group. One end of each second grid plate group away from the arc entrance port serves as the tail end of the grid plate system and is spaced opposite to an arc-striking end of the arc-striking connecting piece in the first direction, and the minimum spacing between the two second grid plate groups in the second direction is greater than the spacing between the arc-striking end and the tail end.

[0009] Furthermore, the second grid plate group includes a plurality of second arc-extinguishing grid plates arranged at intervals along the first direction, and a second arc-extinguishing grid plate far away from the arc entrance is the tail end of the grid plate system.

[0010] Furthermore, the second grid group includes a plurality of second arc-extinguishing grids arranged at intervals along the second direction, and ends of all the second arc-extinguishing grids away from the arc entrance serve as tail ends of the grid system.

[0011] Furthermore, each grid system also includes at least one intermediate grid group, which is located between the first grid group and the second grid group. Each intermediate grid group includes multiple intermediate arc-extinguishing grids, and the multiple intermediate arc-extinguishing grids of the same intermediate grid group are arranged at intervals along the first direction or the second direction.

[0012] Furthermore, the arc-striking connecting piece is a plate-shaped structure, and is arranged along the second direction. The area of ​​the arc-striking connecting piece close to the two grid systems serves as an arc-striking end, and the distance between each arc-striking end and the tail end of a grid system is the smallest.

[0013] Furthermore, the arc-striking connecting piece includes two arc-striking ends and at least one connecting portion, the arc-striking ends are in a straight plate structure, each arc-striking end is arranged along the second direction and is spaced opposite to the tail end of a grid system in the first direction, the connecting portion is connected between the two arc-striking ends, and in the first direction, the connecting portion protrudes toward the arc entrance.

[0014] Furthermore, a connecting portion is connected between the two arc-striking ends, and the connecting portion is in a V-shaped structure.

[0015] Furthermore, a plurality of connection parts are connected between the two arc striking ends, each connection part is a U-shaped bending structure, two adjacent U-shaped bending structures are connected in sequence, and the open end of each U-shaped bending structure is facing away from the arc entrance.

[0016] Furthermore, it also includes a plastic part, the middle part of which is arranged along multiple U-shaped curved structures and correspondingly covers the surface of the connecting part facing the arc entrance, and the two ends of the plastic part extend to cover the area of ​​the two arc-starting ends close to the connecting part.

[0017] Furthermore, the arc-striking connecting piece includes two arc-striking plates, the first end of each arc-striking plate is spaced opposite to the tail end of a grid plate system, the second end of each arc-striking plate extends into the arc running channel, and the second ends of the two arc-striking plates are bent and spaced opposite to each other in the second direction to form an arc-drawing gap.

[0018] Furthermore, in the second direction, the spacing of the arc-drawing gap at one end facing the arc-entry opening and the spacing of the arc-drawing gap at one end away from the arc-entry opening are both greater than the spacing of the middle portion of the arc-drawing gap.

[0019] Furthermore, in the second direction, the distance between the ends of the two grid systems away from the arc entrance is the smallest, or the distance between the ends of the two grid systems away from the arc entrance is the largest.

[0020] Furthermore, it also includes a magnetic blowing component arranged at the arc entrance, the magnetic conductive component includes a magnetic conductive plate and a pair of reflective plates, the magnetic conductive plate and one of the grid systems are located on the same side in the second direction, the pair of magnetic conductive plates are respectively connected to the magnetic conductive plates, and in the third direction, the arc entrance is located between the pair of reflective plates, and the third direction is perpendicular to the first direction and the second direction, respectively.

[0021] Furthermore, it also includes two magnetization and gas production components. In the third direction, the arc running channel is located between the two magnetization and gas production components.

[0022] Furthermore, the magnetized gas production component includes a pair of gas producing parts, each of which is arranged in the arc extinguishing chamber along the first direction, each of which is provided with a mounting groove, and each mounting groove is equipped with a magnetic blowing plate. In the third direction, the two gas producing parts and the two magnetic blowing plates arranged on the gas producing parts correspond to the two sides of the arc running channel.

[0023] The present invention also provides a circuit breaker, including a contact mechanism, wherein the contact mechanism includes a moving contact assembly and a pair of stationary contact assemblies, and also includes the arc extinguishing system as described above, wherein the arc extinguishing system includes two arc extinguishing chambers, and the two arc extinguishing chambers are cooperatively arranged on both sides of the moving contact assembly. In the second direction, a moving contact portion of the moving contact assembly and a stationary contact portion of a stationary contact assembly are spaced opposite to each other and are correspondingly arranged on both sides of the arc entrance port of an arc extinguishing chamber.

[0024] The arc extinguishing system and circuit breaker of the present invention are provided with two grid systems spaced opposite to each other in the arc extinguishing chamber, so that the arc extinguishing chamber has more arc extinguishing grids in a limited space. At the same time, the tail ends of the two grid systems away from the arc entrance are connected in series through arc-striking connectors, thereby improving the utilization rate of the grid systems and the arc extinguishing effect.

[0025] In addition, each grid system can include one or more grid groups, which can meet the needs of different products and has a wide range of applications.

[0026] In addition, the arc-striking connecting piece can be a plate-shaped structure, two arc-striking plates arranged at intervals, or it can have at least one connecting portion protruding toward the arc entrance, wherein the connecting portion can be a V-shaped structure or multiple U-shaped structures, which can facilitate the introduction of the arc into the two grid systems by changing the direction of the current. In particular, the connecting portion with multiple U-shaped structures is covered with a plastic part, so that the arc can bend and climb in the middle of the plastic part to lengthen the arc, which is beneficial to improving the arc extinguishing effect.

[0027] In addition, a magnetic blowing assembly is provided at the arc entrance, which not only speeds up the arc entering the arc extinguishing chamber and quickly limits the circuit current, but also cools and lengthens the arc, reduces the conductivity of the arc, and improves the utilization rate of the arc extinguishing grid and the arc initiation and arc extinguishing effects.

[0028] In addition, in the second direction, the distance between the two grid systems at the ends away from the arc entrance is the smallest, so that the high-temperature gas flows through the arc extinguishing cavity in a contraction direction, ensuring that the arc extinguishing effect can be achieved at places far away from the arc entrance. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1-2 It is a structural schematic diagram of the circuit breaker of the present invention;

[0030] Figure 3 It is a schematic diagram of the exploded structure of the arc extinguishing chamber in the present invention;

[0031] Figure 4 It is a schematic diagram of the direction of the arc extinguishing chamber in the present invention;

[0032] Figure 5 It is a schematic diagram of the structure of the circuit breaker in the present invention when opening (the first embodiment of the arc extinguishing system);

[0033] Figure 6 It is a structural schematic diagram of the arc entering the arc entrance in the present invention (the first embodiment of the arc extinguishing system);

[0034] Figure 7 It is a schematic diagram of the structure when the arc enters the arc running channel and two grid systems in the present invention (the first embodiment of the arc extinguishing system);

[0035] Figure 8 It is a schematic diagram of the structure of the arc in two grid systems and an arc-starting connecting plate in the present invention (the first embodiment of the arc-extinguishing system);

[0036] Fig. 9 It is a schematic diagram of the structure of the arc in two grid systems and an arc-starting connecting plate in the present invention (a second embodiment of the arc-extinguishing system);

[0037] Fig.10 1 is a schematic diagram of the structure of the circuit breaker of the present invention when it is opened (the third embodiment of the arc extinguishing system);

[0038] Fig.11 1 is a schematic diagram of the structure of the circuit breaker of the present invention when it is opened (the fourth embodiment of the arc extinguishing system);

[0039] Fig.12 yes Fig.11 Enlarged view of middle E part;

[0040] Fig.13 1 is a schematic diagram of the structure of the circuit breaker of the present invention when it is opened (the fifth embodiment of the arc extinguishing system);

[0041] Fig.14 yes Fig.13 Enlarged view of the middle D part;

[0042] Fig.15 1 is a schematic diagram of the structure of the circuit breaker of the present invention when it is opened (the sixth embodiment of the arc extinguishing system);

[0043] Fig.16 yes Fig.15 Enlarged view of part A in the middle;

[0044] Fig.17 1 is a schematic diagram of the structure of the circuit breaker of the present invention when it is open (the seventh embodiment of the arc extinguishing system);

[0045] Fig.18 yes Fig.17 Enlarged view of middle part B;

[0046] Fig.19 1 is a schematic diagram of the structure of the circuit breaker of the present invention when it is opened (the eighth embodiment of the arc extinguishing system);

[0047] Fig. 20 yes Fig.19 Enlarged view of middle C;

[0048] Fig.21 It is a structural schematic diagram of the magnetic enhancement gas production component in the present invention;

[0049] Fig. 22 This is a schematic diagram of the structure of the arc-striking connector in the present invention (the connecting portion is a V-shaped structure)

[0050] Fig.23 It is a structural schematic diagram of the arc-striking connector in the present invention (the connecting portion is a plurality of U-shaped bending structures);

[0051] Fig.24 It is a structural schematic diagram of the arc-striking connector in the present invention (the connecting portion is a plurality of U-shaped bent structures and contains plastic parts);

[0052] Fig.25 A schematic diagram of the structure of the magnetic blowing assembly in the present invention;

[0053] Reference numerals:

[0054] 1-arc extinguishing chamber, 101-arc entrance, 102-exhaust port, 103-arc running channel, 10-grid system, 11-first grid group, 12-second grid group, 13-arc striking connector, 131-arc striking end, 132-connecting part, 133-plastic part, 134-arc striking sheet, 14-magnetic blowing assembly, 141-magnetic conductive plate, 142-reflecting plate, 15-magnetization gas production assembly, 151-gas production part, 1511-installing groove, 152-magnetic blowing plate, 16-arc striking plate, 17-middle grid group, 18-arc striking part, 19-side plate, 2-moving contact assembly, 3-static contact assembly, 4-operating mechanism. DETAILED DESCRIPTION

[0055] The following embodiments are combined with the accompanying drawings to further illustrate the specific implementation of the arc extinguishing system and circuit breaker of the present invention. The arc extinguishing system and circuit breaker of the present invention are not limited to the description of the following embodiments.

[0056] like Figure 1 As shown, the circuit breaker includes a housing, an operating mechanism 4 and at least one circuit breaker pole driven by the operating mechanism 4 are arranged in the housing, each circuit breaker pole includes a conductive unit, each conductive unit includes a wiring assembly, a contact mechanism and an arc extinguishing system, wherein the wiring assemblies are respectively arranged at both ends of the circuit breaker pole, the contact mechanism includes a moving contact assembly 2 and a pair of stationary contact assemblies 3, the moving contact assembly 2 is rotatably arranged between the pair of stationary contact assemblies 3, each stationary contact assembly 3 is respectively connected to a wiring assembly, and the operating mechanism 4 drives the moving contact assembly 2 between the pair of stationary contact assemblies 3. The moving contact assembly 2 rotates between the moving contact parts and the static contact parts of the static contact assembly 3, respectively. When the number of the circuit breaker poles is more than one, the two adjacent circuit breaker poles are assembled side by side, and the moving contact assemblies 2 of the two adjacent circuit breaker poles are linked and connected; the arc extinguishing system of each circuit breaker pole includes two arc extinguishing chambers 1, each arc extinguishing chamber 1 is respectively arranged on one side of the contact mechanism, that is, the two arc extinguishing chambers 1 are respectively located on the opposite sides of the contact mechanism, and the two arc extinguishing chambers 1 form a rotationally symmetrical structure with respect to the contact mechanism, and the arc generated when the contact mechanism is disconnected is extinguished by the arc extinguishing chamber 1.

[0057] Specifically, Figure 2-3As shown, two arc extinguishing chambers 1 are respectively located on both sides of the moving contact assembly 2, each arc extinguishing chamber 1 includes a cover (not shown), and the arc extinguishing cavity is formed by the internal space of the cover, and an arc entry port 101 and an exhaust port 102 are respectively provided at both ends of the arc extinguishing cavity, wherein the arc entry port 101 cooperates with the contact mechanism, and the exhaust port 102 is far away from the contact mechanism and is used to discharge the high-temperature exhaust gas generated after arc extinguishing, and two grid systems 10 are arranged in the arc extinguishing cavity with relative spacing, and the arc extinguishing cavity space located between the two grid systems 10 is an arc running channel 103, and the arc running channel 103 is respectively interconnected with the exhaust port 102 and the arc entry port 101, and each grid system 10 is used to cut the arc entering the arc extinguishing cavity.

[0058] like Figure 4 As shown, the direction of the line from the arc entrance 101 to the exhaust port 102 in the arc extinguishing cavity is the first direction, that is, the left and right direction in the figure is the first direction, the first direction is represented by the X direction, and the two directions perpendicular to the first direction in the arc extinguishing cavity are the second direction and the third direction. Figure 4 The Y direction represents the second direction. The two grid systems 10 are spaced and opposite to each other in the second direction and form an arc running channel 103 connected to the arc entrance 101. The arc running channel 103 basically extends along the first direction and connects the arc entrance 101 and the exhaust port 102. The third direction is perpendicular to the first direction and the second direction, that is, Figure 4 In the direction perpendicular to the paper. Of course, if Figure 1 The arc extinguishing chamber 1 as a whole can be arranged slightly tilted or horizontally in the circuit breaker.

[0059] The improvement of the present application is that the arc extinguishing chamber 1 also includes an arc-striking connector 13, which is arranged at one end of the arc running channel 103 away from the arc entrance 101, and the tail ends of the two grid systems 10 away from the arc entrance 101 are connected in series by the arc-striking connector 13, that is, the electrical gap between the tail ends of the two grid systems 10 is less than the minimum physical distance between the two grid systems 10, and the minimum physical distance refers to the minimum distance between the two grid systems in the second direction, which is conducive to the arc erosion of all arc-extinguishing grids of the two grid groups, thereby improving the utilization rate of the arc-extinguishing grids. In this way, two grid systems 10 with opposite spacing are arranged in the arc extinguishing chamber, so that the arc extinguishing chamber 1 has more arc-extinguishing grids in a limited space, and at the same time, the tail ends of the two grid systems 10 away from the arc entrance 101 are connected in series through the arc-striking connector 13, thereby improving the utilization rate and arc extinguishing effect of the grid system 10.

[0060] Each grid plate system 10 includes one grid plate group or more than one grid plate group, which can meet the needs of different products and has a wide range of applications.

[0061] Specifically, each grid system 10 includes a grid group, which includes a plurality of arc-extinguishing grids arranged at intervals along a first direction, and the arc-extinguishing grid at one end away from the arc entrance 101 is a tail grid. The tail grid and an arc-striking end 131 of the arc-striking connecting piece 13 are spaced opposite to each other in the first direction, and the interval between the tail grid and the arc-striking end 131 is smaller than the interval between the two grid groups in the second direction, which has low cost and good arc-extinguishing effect.

[0062] Alternatively, each grid system 10 includes at least two grid groups arranged along the first direction. In the same grid system 10, the grid group close to the arc entrance port 101 is the first grid group 11, and the grid group away from the arc entrance port 101 is the second grid group 12. One end of each second grid group 12 away from the arc entrance port 101 serves as the tail end of the grid system 10 and is spaced opposite to an arc-striking end 131 of the arc-striking connecting piece 13 in the first direction, and the minimum spacing between the two second grid groups 12 in the second direction is greater than the spacing between the arc-striking end 131 and the tail end. It has more grid groups, which is conducive to obtaining a better arc extinguishing effect.

[0063] Preferably, the arc-striking connecting piece 13 is arranged roughly along the second direction. The structure of the arc-striking connecting piece 13 is diverse, and can be an integral structure or a split structure. The integral structure can be a plate-shaped structure, or it can have at least one connecting portion 132 protruding toward the arc entrance port 101, and the connecting portion 132 changes the direction of the current, thereby facilitating the arc to be introduced into the grid system 10.

[0064] Combination Figure 1-8 , 21 and 25 provide a first embodiment of the arc extinguishing system.

[0065] like Figure 1-8 As shown, the arc extinguishing system includes two arc extinguishing chambers 1, each arc extinguishing chamber 1 includes a cover, an arc extinguishing cavity is formed inside the cover, an arc entrance port 101 is provided at one end of the arc extinguishing cavity, an exhaust port 102 is provided at one end of the arc extinguishing cavity opposite to the arc entrance port 101, two grid systems 10 spaced opposite to each other in a second direction are arranged in the arc extinguishing cavity, each grid system 10 is arranged on one side of the arc entrance port 101 as a whole along the first direction, the head end of each grid system 10 is close to the arc entrance port 101, and the tail end is close to the exhaust port 102, the interval between the two grid systems 10 in the second direction serves as an arc running channel 103, and the arc running channel 103 is respectively connected to the arc entrance port 101 and the exhaust port 102.

[0066] In this embodiment, each grid system 10 includes a grid group, each grid group includes a plurality of arc-extinguishing grids arranged at intervals along the first direction, an arc-extinguishing gap is formed between two adjacent arc-extinguishing grids, the arc-extinguishing grid far from the arc-entry port 101 is the tail grid, the arc-extinguishing grid close to the arc-entry port 101 is the head grid, the head grid and the tail grid are the head end and the tail end of a grid system 10 respectively, the plane where the arc-extinguishing grid is located is substantially perpendicular to the first direction and parallel to the second direction, an arc-extinguishing notch is provided at one end of each arc-extinguishing grid, all arc-extinguishing notches are connected along the first direction to form an arc-extinguishing groove, and the arc-extinguishing grooves of the two grid systems 10 are respectively oriented toward the arc-running channel 103. Figure 3 , 5 -8, the arc extinguishing grids in the same grid system 10 have the same size, so that in the second direction, the heights of the head end and the tail end of the grid system 10 are equal.

[0067] like Figure 1 , 2 , 5-8 and 25, a magnetic blowing assembly 14 is provided at the arc entrance 101, and the magnetic blowing assembly 14 forms an arc striking magnetic field in a third direction at the arc entrance 101, which is conducive to the arc being blown into the arc extinguishing cavity, as shown in detail. Fig.25 As shown, the magnetic blowing assembly 14 includes a magnetic conductive plate 141 and a pair of reflecting plates 142. The magnetic conductive plate 141 in the figure is U-shaped as a whole. Preferably, in the second direction, the magnetic conductive plate 141 and a grid system 10 are located on the same side, and the magnetic conductive plate 141 includes two connecting arms spaced opposite to each other in the third direction, and each connecting arm is connected to a reflecting plate 142. In the third direction, the arc entrance port 101 is located between the two connecting arms and the pair of reflecting plates 142, and is completely covered by the reflecting plate 142 on the arc entrance port 101 for reflecting the arc and improving the arc striking effect.

[0068] Preferably, Figure 1 , 2 As shown in Figures 6-8, two arc-starting plates 16 are further provided at the arc entrance port 101. The two arc-starting plates 16 are spaced opposite to each other in the second direction and extend into the arc extinguishing chamber along both sides of the arc entrance port 101 respectively. One end of each arc-starting plate 16 extends to the head end of a grid system 10 respectively. Preferably, one end of each arc-starting plate 16 is bent and parallel to the head end of the grid system 10, the other end of one arc-starting plate 16 is bent and connected to the moving contact assembly 2 in the disconnecting position, and the other end of the other arc-starting plate 16 is connected to the static contact assembly 3.

[0069] like Figure 3As shown, a pair of side plates 19 are further provided in the arc extinguishing chamber, and the pair of side plates 19 are spaced and opposite to each other in the third direction. The grid groups of the two grid systems 10 are assembled between the pair of side plates 19, and one arc-starting plate 16 is welded to one side plate 19. Each side plate 19 is cooperatively arranged on the inner side wall of the housing. In this embodiment, the arc-starting plate 16 used to cooperate with the moving contact assembly 2 is welded to the side plate 19; Figure 3 , 21 As shown, two magnetizing gas producing components 15 are further arranged in the arc extinguishing chamber. In the third direction, the arc running channel 103 is located between the two magnetizing gas producing components 15. The magnetizing gas producing components 15 generate gas and magnetic field to drive the arc to move. The magnetizing gas producing components 15 include a pair of gas producing parts 151. Figure 3 Each gas producing part 151 is arranged on a side plate 19 along a first direction, and the two gas producing parts 151 correspond to the two sides of the arc running channel 103. Preferably, a plurality of slots are opened on the edge of the gas producing part 151, and the slots are used to plug in the arc extinguishing grid. Each gas producing part 151 is also provided with a mounting groove 1511, and a magnetic blowing plate 152 is installed in each mounting groove 1511. The two magnetic blowing plates 152 correspond to the two sides of the arc running channel 103. When the arc enters the arc extinguishing chamber, the gas producing part 151 can generate gas to push the arc to move. A pair of magnetic blowing plates 152 forms a magnetic field in a third direction in the arc running space to push the arc into the two grid systems 10. The magnetization gas producing component 15 of this embodiment can adopt the existing technology.

[0070] like Figure 2 , 3 As shown, the arc running channel 103 away from the arc entrance port 101 is also provided with an arc-striking connecting piece 13, wherein the tail grid of each grid system 10 and an arc-striking end 131 of the arc-striking connecting piece 13 are spaced opposite to each other in the first direction, and the spacing between the tail grid and the arc-striking end 131 is smaller than the spacing between the two grid groups in the second direction.

[0071] In this embodiment, the arc-striking connector 13 is a plate-shaped structure, and the arc-striking connector 13 is arranged along the second direction. The area of ​​the arc-striking connector 13 close to the two grid systems 10 is used as an arc-striking end 131, and the distance between each arc-striking end 131 and the tail end of a grid system 10 is the smallest. Two arc-extinguishing chambers 1 of the same arc-extinguishing system can use arc-striking connectors 13 with different structures.

[0072] like Figure 3 , 5 -8, wherein an arc-striking connecting piece 13 of the right arc-extinguishing chamber 1 is a straight plate structure, and the plate surfaces close to the two ends of the arc-striking connecting piece 13 serve as two arc-striking ends 131 respectively, and each arc-striking end 131 is parallel to and opposite to a tail grid of a grid system 10, and the spacing between each arc-striking end 131 and a tail grid is preferably less than or equal to the arc-extinguishing gap.

[0073] like Figure 5-8 As shown, an arc-striking connector 13 of the left arc-extinguishing chamber 1 is a straight plate structure, the middle part of the arc-striking connector 13 is bent so that the two ends of the arc-striking connector 13 are offset and parallel, one end of the arc-striking connector 13 serves as an arc-striking end 131 and is spaced opposite to the tail grid of a grid system 10, and the middle bent portion of the arc-striking connector 13 serves as another arc-striking end 131, which is spaced opposite to the tail grid of another grid system 10, and the spacing between each arc-striking end 131 and a tail grid is preferably less than or equal to the arc-extinguishing gap. At this time, the other end of the arc-striking connector 13 is farther away from the tail grid.

[0074] Combination Figure 4 , 9 and 22-24 provide a second embodiment of the arc extinguishing system.

[0075] The arc extinguishing system of this embodiment includes two arc extinguishing chambers 1, each arc extinguishing chamber 1 includes a cover, an arc striking plate 16, a grid system 10, a magnetic blowing assembly 14 and a magnetic enhancement gas production assembly 15, which are the same as those of the first embodiment. Different from the first embodiment, the arc striking connector 13 of this embodiment can be provided with a connecting portion 132 for changing the direction of the arc current, so as to facilitate the introduction of the arc into the two grid systems 10.

[0076] Among them, Fig. 9 , 22 As shown, the arc-striking connecting piece 13 includes two arc-striking ends 131 and at least one connecting portion 132. The arc-striking ends 131 are in a straight plate structure. Each arc-striking end 131 is arranged along the second direction and is spaced opposite to the tail end of a grid system 10. The connecting portion 132 is connected between the two arc-striking ends 131. In the first direction, the connecting portion 132 protrudes toward the arc entrance 101. In the present embodiment, the connecting portion 132 is a V-shaped structure. Of course, a plurality of connecting portions 132 connected in sequence may also be arranged between the two arc-striking ends 131. Each connecting portion 132 is V-shaped, but its protruding direction should be toward the arc entrance 101.

[0077] Combination Fig.23 , 24 Another structure of an arc-striking connector 13 is provided, the arc-striking connector 13 includes two arc-striking ends 131 and one or more connecting portions 132, each connecting portion 132 is a U-shaped curved structure, two adjacent U-shaped curved structures are connected in sequence, and the open end of each U-shaped curved structure is facing away from the arc inlet 101, and the multiple connecting portions 132 are used to change the direction of the current; further, as Fig.24As shown, the arc-striking connector 13 also includes a plastic part 133. The middle part of the plastic part 133 is arranged along multiple U-shaped curved structures and corresponds to covering the surface of the connecting part 132 facing the arc entrance port 101. The two ends of the plastic part 133 extend to cover the area of ​​the two arc-striking ends 131 close to the connecting part 132. The two ends of the plastic part 133 and the two arc-striking ends 131 can be fastened and assembled with screws. The arc can bend and climb in the middle part of the plastic part 133 to lengthen the arc, which is beneficial to improving the arc extinguishing effect.

[0078] It should be noted that, when the arc extinguishing chamber 1 is applied to a conductive unit, the arc-striking connectors 13 in the two arc extinguishing chambers 1 of the same circuit breaker pole may adopt different structures.

[0079] Combination Figure 4 , 10 , 21 and 25 provide a third embodiment of the arc extinguishing system.

[0080] The arc extinguishing system of the present embodiment also includes two arc extinguishing chambers 1, each arc extinguishing chamber 1 includes a cover shell, an arc striking plate 16, a magnetic blowing assembly 14, an arc striking connector 13 and a magnetization gas production assembly 15 which are the same as those of the first embodiment, and the two grid systems 10 are spaced opposite to each other in the second direction, each grid system 10 includes a grid group, and each grid group includes a plurality of arc extinguishing grids arranged at intervals. The difference from the first embodiment is that in the second direction, the first grid of the same grid group has the smallest size, the tail grid has the largest size, and all arc extinguishing grids of the same grid group are aligned with the side facing away from the arc running channel 103, thereby, the opening spacing of one end of the arc running channel 103 close to the arc entrance port 101 is greater than the opening spacing of the other end of the arc running channel 103 away from the arc entrance port 101, so that the inlet in the direction of high-temperature gas movement is larger than the outlet, and the high-temperature gas flow passes through the arc extinguishing chamber in a contraction direction to ensure that the arc extinguishing effect can be achieved at a place far away from the arc entrance port 101.

[0081] In this embodiment, the size of the arc extinguishing grid between the first grid and the last grid in the same grid group gradually increases, so that the overall opening spacing of the arc running channel 103 gradually decreases. Of course, it can also be increased in a step-by-step manner. In this case, the opening spacing of the arc running channel 103 decreases in a step-by-step manner.

[0082] Combination Figure 4 , 11 , 12, 21 and 25 provide a fourth embodiment of the arc extinguishing system.

[0083] The arc extinguishing system of this embodiment includes two arc extinguishing chambers 1, each arc extinguishing chamber 1 includes the same housing, arc striking plate 16, magnetic blowing assembly 14 and magnetization gas production assembly 15 as those of the first embodiment. Different from the first embodiment, the arc striking connector 13 of this embodiment is the same as that of the second embodiment, and the arc striking connector 13 includes a V-shaped connecting portion 132, but the tip of the connecting portion 132 is relatively blunt, and the two arc striking ends 131 are slightly angled with the second direction.

[0084] Each grid system 10 includes a plurality of arc-extinguishing grids arranged at intervals along a first direction. Different from the first embodiment, each arc-extinguishing grid forms a slight angle with the second direction, and the angle is less than or equal to 30°.

[0085] In addition, in this embodiment, the distance between the two grid systems 10 at the ends away from the arc entrance 101 is the largest.

[0086] Combination Figure 4 , 13 , 14, 21 and 25 provide a fifth embodiment of the arc extinguishing system.

[0087] The arc extinguishing system of this embodiment includes two arc extinguishing chambers. Each arc extinguishing chamber 1 includes a cover, an arc striking plate 16, a grid system 10, a magnetic blowing assembly 14 and a magnetization gas production assembly 15 that are the same as those of the first embodiment. Different from the first embodiment, the arc striking connector 13 of this embodiment is a split structure.

[0088] like Fig.13 , 14 As shown, the arc-striking connecting piece 13 includes two arc-striking plates 134, the first end of each arc-striking plate 134 is spaced opposite to the tail end of a grid system 10, the second end of each arc-striking plate 134 extends into the arc running channel 103, the second ends of the two arc-striking plates 134 are bent and spaced opposite to each other in the second direction to form an arc-drawing gap, and in the second direction, the spacing of the arc-drawing gap facing the arc entrance port 101 and the spacing away from the arc entrance port 101 are both greater than the middle spacing of the arc-drawing gap.

[0089] In addition, in this embodiment, the distance between a pair of arc-starting plates 16 ( Fig.14 The opening distance between the moving contact assembly 2 and the stationary contact assembly 3 is less than or equal to L1, so that the arc can enter the arc running zone. Since the middle part of the arc gap is the narrowest part, the arc forms a short arc in the middle part of the arc gap and moves toward the arc entrance 101 along the two arc-starting pieces 134 under the action of magnetic blowing. As the arc gap gradually increases, the arc is elongated.

[0090] Combination Figure 4 , 15 , 16, 21 and 25 provide a sixth embodiment of the arc extinguishing system.

[0091] The arc extinguishing system of this embodiment includes two arc extinguishing chambers 1, each arc extinguishing chamber 1 includes a cover shell, an arc-starting plate 16, a magnetic blowing assembly 14 and a magnetization gas production assembly 15 that are the same as those of the first embodiment. The two grid systems 10 in the arc extinguishing chamber are spaced opposite to each other along the second direction and are respectively arranged along one side of the arc entrance port 101. Different from the first embodiment, each grid system 10 includes two grid groups and an arc-starting member 18. For the convenience of description, the two grid groups are respectively a first grid group 11 and a second grid group 12.

[0092] like Fig.15 , 16 As shown, the first grid plate group 11 is located at one end close to the arc entrance port 101, and the end of each first grid plate group 11 close to the arc entrance port 101 is the head end of the grid plate system 10. The first grid plate group 11 includes a plurality of first arc extinguishing grid plates arranged at intervals along the second direction, and one end of all the first arc extinguishing grid plates close to the arc entrance port 101 is the head end of the grid plate system 10. A first arc extinguishing gap is formed between two adjacent first arc extinguishing grid plates, and a first arc extinguishing notch is opened at one end of each first arc extinguishing grid plate. All the first arc extinguishing notches are connected in the second direction to form a first arc extinguishing groove, and the first arc extinguishing groove faces the arc entrance port 101.

[0093] The second grid group 12 is located at one end away from the arc entrance 101, and the end of each second grid group 12 away from the arc entrance 101 is used as the tail end of the grid system 10. An arc-striking end 131 of the arc-striking connector 13 is spaced opposite to the tail end of the grid system 10 in the first direction, and the minimum spacing between the two second grid groups 12 in the second direction is greater than the spacing between the arc-striking end 131 and the tail end. Specifically, each second grid group 12 includes a plurality of second arc-extinguishing grids spaced along the first direction, and a second arc-extinguishing grid away from the arc entrance 101 is the tail end of the grid system 10. A second arc-extinguishing gap is formed between two adjacent second arc-extinguishing grids. A second arc-extinguishing notch is provided at one end of each second arc-extinguishing grid, and all arc-extinguishing notches are connected in the first direction to form a second arc-extinguishing groove, and the second arc-extinguishing groove faces the arc running channel 103. The arc-extinguishing grids of the first grid group 11 and the second grid group 12 are arranged in directions substantially perpendicular to each other.

[0094] In this embodiment, in the same grid plate system 10, the first grid plate group 11 and the second grid plate group 12 have the same height in the second direction, so that the spacing between the two grid plate systems 10 in the second direction is approximately equal, that is, the spacing between the arc running channel 103 at one end close to the arc entrance port 101 and the spacing between the end away from the arc entrance port 101 are approximately equal.

[0095] Each grid system 10 is further provided with an arc-starting member 18, each arc-starting member 18 includes two connecting ends, and the two connecting ends of each arc-starting member 18 are spaced opposite to the arc-extinguishing grids of the adjacent grid group. In this embodiment, Fig.15, 16 As shown, the arc-striking member 18 is a U-shaped plate structure, and one side wall of the U-shaped plate structure serves as a connecting end, which is parallel to and opposite to the second arc-extinguishing grid near the second grid group 12, and the other side wall end of the U-shaped plate structure is bent and extended outward to form another connecting end, which is spaced apart and opposite to the first arc-extinguishing grid of the first grid group 11 near the arc running channel 103. At this time, the two connecting ends of the arc-striking member 18 are approximately vertical.

[0096] In this embodiment, the arc-striking connector 13 connected to the rear ends of the two grid systems 10 may be any one of the above embodiments.

[0097] Combination Figure 4 , 17 , 18, 21 and 25 provide a seventh embodiment of the arc extinguishing system.

[0098] The arc extinguishing system of this embodiment includes two arc extinguishing chambers 1, each arc extinguishing chamber 1 includes a cover shell, an arc-starting plate 16, a magnetic blowing assembly 14 and a magnetization gas production assembly 15 that are the same as those of the first embodiment. The two grid systems 10 in the arc extinguishing chamber are spaced opposite to each other along the second direction and are respectively arranged along one side of the arc entrance port 101. Different from the first embodiment, each grid system 10 includes three grid groups and two arc-starting parts 18. For the convenience of description, the three grid groups are respectively a first grid group 11, a second grid group 12 and an intermediate grid group 17.

[0099] like Fig.17 , 18 As shown, the first grid plate group 11 is located at one end close to the arc entrance port 101, and the end of each first grid plate group 11 close to the arc entrance port 101 is the head end of the grid plate system 10. The first grid plate group 11 includes a plurality of first arc-extinguishing grid plates arranged at intervals along the second direction, that is, the plane where the first arc-extinguishing grid plates are located is basically parallel to the first direction and perpendicular to the second direction. One end of all the first arc-extinguishing grid plates close to the arc entrance port 101 is the head end of the grid plate system 10, and a first arc-extinguishing notch is opened at one end of each first arc-extinguishing grid plate, and all the first arc-extinguishing notches are connected in the second direction to form a first arc-extinguishing groove.

[0100] The second grid plate group 12 is located at an end away from the arc entrance port 101, and the end of each second grid plate group 12 away from the arc entrance port 101 serves as the tail end of the grid plate system 10. An arc-striking end 131 of the arc-striking connecting member 13 is spaced opposite to the tail end of the grid plate system 10 in the first direction, and the minimum spacing between the two second grid plate groups 12 in the second direction is greater than the spacing between the arc-striking end 131 and the tail end. Specifically, each second grid plate group 12 includes a plurality of second arc-extinguishing grid plates spaced along the second direction, that is, the plane where the second arc-extinguishing grid plates are located is basically parallel to the first direction and perpendicular to the second direction, and the end of all the second arc-extinguishing grid plates away from the arc entrance port 101 serves as the tail end of the grid plate system 10. A second arc-extinguishing notch is provided at one end of each second arc-extinguishing grid plate, and all the arc-extinguishing notches are connected in the second direction to form a second arc-extinguishing groove.

[0101] like Fig.17 , 18 As shown, the intermediate grid group 17 is located between the first grid group 11 and the second grid group 12, and the intermediate grid group 17 includes a plurality of intermediate arc-extinguishing grids. The plurality of intermediate arc-extinguishing grids of the same intermediate grid group 17 are spaced apart along the second direction, that is, the plane where the intermediate arc-extinguishing grids are located is substantially parallel to the first direction and perpendicular to the second direction. An intermediate arc-extinguishing notch is provided at one end of each intermediate arc-extinguishing grid, and all the intermediate arc-extinguishing notches are connected along the second direction to form an intermediate arc-extinguishing groove.

[0102] In the present embodiment, the first arc extinguishing groove, the second arc extinguishing groove and the middle arc extinguishing groove are all oriented toward the arc entrance port 101. In the same grid system 10, the first grid group 11, the second grid group 12 and the middle grid group 17 are at the same height in the second direction. Thus, the spacing between the two grid systems 10 in the second direction is substantially equal, that is, the spacing between the end of the arc running channel 103 close to the arc entrance port 101 and the spacing between the end away from the arc entrance port 101 are substantially equal. Of course, the heights of the first grid group 11, the second grid group 12 and the middle grid group 17 in the second direction may not be completely equal by changing the first arc extinguishing gap, the second arc extinguishing gap or the middle arc extinguishing gap. Of course, the same is also applicable by increasing or decreasing the first arc extinguishing grid, the second arc extinguishing grid or the middle arc extinguishing grid, or adjusting the setting angles of the first arc extinguishing grid, the second arc extinguishing grid and the middle arc extinguishing grid. Of course, the maximum included angle between the first arc extinguishing grid, the second arc extinguishing grid and the middle arc extinguishing grid and the first direction or the second direction is 30°.

[0103] An arc-starting piece 18 is provided between adjacent grid groups of each grid system 10. In the grid system 10 of the present embodiment, two arc-starting pieces 18 are further provided, wherein one arc-starting piece 18 is located between the first grid group 11 and the middle grid group 17, and the other arc-starting piece 18 is located between the middle grid group 17 and the second grid group 12. Each arc-starting piece 18 includes two connecting ends, and each connecting end is used to connect with the arc extinguishing grid of the adjacent grid group.

[0104] In this embodiment, the arc-starting member 18 located between the first grid plate group 11 and the middle grid plate group 17 is the first arc-starting member, and the arc-starting member 18 located between the middle grid plate group 17 and the second grid plate group 12 is the second arc-starting member.

[0105] In this embodiment, the first arc-striking member is in the shape of a plate as a whole, and the two ends of the first arc-striking member are respectively bent to form two connecting ends, so that the first arc-striking member is in the shape of a "ㄣ", one of the connecting ends is opposite to a first arc-extinguishing grid closest to the arc running channel 103, and the other connecting end is opposite to a middle arc-extinguishing grid away from the arc running channel 103; the second arc-striking member is in the shape of a plate as a whole, and the two ends of the second arc-striking member are respectively bent to form two connecting ends, so that the second arc-striking member is in the shape of a "√", one of the connecting ends is opposite to a second arc-extinguishing grid away from the arc running channel 103, and the other connecting end is connected to one end of the middle grid group 17 close to the second grid group 12.

[0106] In this embodiment, the arc-striking connector 13 connected to the rear ends of the two grid systems 10 may be any one of the above embodiments.

[0107] Combination Figure 4 , 19 -21 and 25 provide an eighth embodiment of the arc extinguishing system.

[0108] The arc extinguishing system of this embodiment includes two arc extinguishing chambers 1, each arc extinguishing chamber 1 includes the same cover, arc striking plate 16, magnetic blowing assembly 14 and magnetization gas production assembly 15 as those of the first embodiment, and the two grid systems 10 in the arc extinguishing chamber are spaced opposite to each other in the second direction and are respectively arranged along one side of the arc entrance port 101. As in the seventh embodiment, each grid system 10 includes three grid groups and two arc striking members 18. For the convenience of description, the three grid groups are respectively a first grid group 11, a second grid group 12 and an intermediate grid group 17, wherein the first grid group 11 and the second grid group 12 are arranged in the same manner as those of the seventh embodiment, and the intermediate grid group 17 is located between the first grid group 11 and the second grid group 12.

[0109] like Fig.19 , 20 As shown, different from the seventh embodiment, the intermediate grid group 17 includes a plurality of intermediate arc-extinguishing grids arranged at intervals along the first direction, that is, the plane where the intermediate arc-extinguishing grids are located is basically parallel to the second direction and perpendicular to the first direction, and an intermediate arc-extinguishing notch is opened at one end of each intermediate grid group 17, and all the intermediate arc-extinguishing notches are connected along the first direction to form an intermediate arc-extinguishing groove.

[0110] In this embodiment, in the same grid system 10, the first grid group 11, the second grid group 12 and the middle grid group 17 are at the same height in the second direction, so that the spacing between the two grid systems 10 in the second direction is approximately equal, that is, the spacing between the arc running channel 103 at one end close to the arc entrance port 101 and the spacing between the end away from the arc entrance port 101 are approximately equal, the first arc extinguishing groove and the second arc extinguishing groove are both facing the arc entrance port 101, and the middle arc extinguishing groove is facing the arc running channel 103.

[0111] In this embodiment, the two arc-starting members 18 adopt the same structure, and each arc-starting member 18 includes two connecting ends respectively matched with adjacent grid groups, such as Fig.19 , 20 As shown, each arc-striking member 18 is a U-shaped plate structure, and one side wall of the U-shaped plate structure serves as a connecting end, which is the first connecting end. The other side wall end of the U-shaped plate structure is bent outward and extends to form another connecting end, that is, the second connecting end of the arc-striking member 18. The second connecting end is approximately perpendicular to the first connecting end. When the arc-striking member 18 is arranged between two adjacent grid groups, the first connecting end is approximately arranged along the second direction. At this time, the first connecting end can be spaced opposite to the adjacent middle arc-extinguishing grid. The second connecting end is located in the arc running channel 103 and is approximately arranged along the first direction. The second connecting end of one arc-striking member 18 is spaced opposite to the first arc-extinguishing grid closest to the arc running channel 103, and the second connecting end of the other arc-striking member 18 is spaced opposite to the second arc-extinguishing grid closest to the arc running channel 103.

[0112] In this embodiment, the arc-striking connector 13 connected to the rear ends of the two grid systems 10 may be any one of the above embodiments.

[0113] It should be noted that in the seventh and eighth embodiments, the number of the intermediate grid groups 17 may be more than one. When the number of the intermediate grid groups 17 is two or more, an arc-starting member 18 for starting an arc also needs to be provided between two adjacent intermediate arc-extinguishing grids.

[0114] It should be noted that, in the above embodiment, the two grid systems 10 in the same arc extinguishing chamber 1 preferably form a symmetrical structure with respect to the arc running channel 103 .

[0115] In the above embodiment, the arc extinguishing system is suitable for a contact unit with double breakpoints, that is, the moving contact assembly 2 in the conductive unit includes a rotating shaft and a pair of moving contact parts arranged on the rotating shaft, and the pair of moving contact parts are respectively arranged on opposite sides of the rotating shaft. Preferably, a moving contact bridge is arranged along the radial direction of the rotating shaft, and the two ends of the moving contact bridge serve as two moving contact parts respectively, and each moving contact part contacts or separates with the static contact part of a static contact assembly 3 respectively, thereby forming a contact unit with double breakpoints. The two arc extinguishing chambers 1 of the arc extinguishing system are respectively arranged on opposite sides of the moving contact assembly 2, and the moving contact assembly 2 and the static contact assembly 3 in the conductive unit are spaced apart in the second direction at the arc entry port 101 of an arc extinguishing chamber 1, that is, each moving contact part is spaced apart and opposite to the static contact part of a static contact assembly 3 in the second direction and contacts or separates at the arc entry port 101, wherein the moving contact assembly 2 and the wiring assembly connected to the static contact assembly 3 can adopt the existing technology.

[0116] Combination Figure 1 , 2 and 25 provide a structure of a static contact assembly 3, the static contact assembly 3 includes a conductive plate, in the second direction, the conductive plate and the magnetic conductive plate 141 are located on the same side, one end of the conductive plate is provided with a wiring portion for connecting to a wiring assembly, the other end of the conductive plate is folded back and provided with a static contact portion, one end of the conductive plate with the static contact portion extends through the magnetic blowing assembly 14 to the arc entrance port 101, that is, in the third direction, one end of the conductive plate with the static contact portion is located between the two connecting arms of the magnetic conductive plate 141, and the conductive plate with the static contact portion is connected to an arc starting plate 16.

[0117] It should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc. indicate directions or positional relationships based on directions or positional relationships shown in the accompanying drawings, or directions or positional relationships that are usually placed when in use, and are only for the convenience of description, rather than indicating that the device or element referred to must have a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish descriptions, and cannot be understood as indicating relative importance.

[0118] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. An arc extinguishing system, comprising an arc extinguishing chamber (1), wherein the arc extinguishing chamber (1) comprises an arc extinguishing cavity and two grid systems (10) arranged in the arc extinguishing cavity, wherein the two grid systems (10) are spaced and opposed to each other in a second direction and form an arc running channel (103) extending along a first direction and communicating with an arc inlet (101), wherein the first direction is perpendicular to the second direction, and wherein: It also includes an arc-striking connector (13), which is arranged at one end of the arc-running channel (103) away from the arc-entry port (101), and the arc-striking connector (13) connects the tail ends of the two grid systems (10) away from the arc-entry port (101) in series.

2. The arc extinguishing system according to claim 1, characterized in that: Each grid plate system (10) comprises a grid plate group, each grid plate group comprises a plurality of arc extinguishing grid plates spaced apart along a first direction, the arc extinguishing grid plate at one end away from the arc inlet (101) is a tail grid plate, the tail grid plate and an arc striking end (131) of an arc striking connector (13) are spaced apart and opposite to each other in the first direction, and the spacing between the tail grid plate and the arc striking end (131) is smaller than the spacing between the two grid plate groups in the second direction.

3. The arc extinguishing system according to claim 1, characterized in that: Each grid plate system (10) comprises at least two grid plate groups arranged along a first direction; in the same grid plate system (10), the grid plate group close to the arc entrance port (101) is a first grid plate group (11), and the grid plate group away from the arc entrance port (101) is a second grid plate group (12); one end of each second grid plate group (12) away from the arc entrance port (101) serves as a tail end of the grid plate system (10) and is spaced opposite to an arc striking end (131) of an arc striking connecting piece (13) in the first direction, and the minimum spacing between the two second grid plate groups (12) in the second direction is greater than the spacing between the arc striking end (131) and the tail end.

4. The arc extinguishing system according to claim 3, characterized in that: The second grid plate group (12) comprises a plurality of second arc extinguishing grid plates arranged at intervals along a first direction, and a second arc extinguishing grid plate away from the arc entrance (101) is the tail end of the grid plate system (10).

5. The arc extinguishing system according to claim 3, characterized in that: The second grid plate group (12) comprises a plurality of second arc-extinguishing grid plates arranged at intervals along a second direction, and the ends of all the second arc-extinguishing grid plates away from the arc entrance opening (101) serve as the tail ends of the grid plate system (10).

6. The arc extinguishing system according to claim 3, characterized in that: Each grid system (10) further comprises at least one intermediate grid group (17), wherein the intermediate grid group (17) is located between the first grid group (11) and the second grid group (12), and each intermediate grid group (17) comprises a plurality of intermediate arc-extinguishing grids, wherein the plurality of intermediate arc-extinguishing grids of the same intermediate grid group (17) are arranged at intervals along the first direction or the second direction.

7. The arc extinguishing system according to any one of claims 1 to 6, characterized in that: The arc-striking connecting piece (13) is a plate-shaped structure. The arc-striking connecting piece (13) is arranged along the second direction. The area of ​​the arc-striking connecting piece (13) close to the two grid systems (10) serves as an arc-striking end (131). The distance between each arc-striking end (131) and the tail end of a grid system (10) is the smallest.

8. The arc extinguishing system according to any one of claims 1 to 6, characterized in that: The arc-striking connecting piece (13) comprises two arc-striking ends (131) and at least one connecting portion (132); the arc-striking ends (131) are in a straight plate structure; each arc-striking end (131) is arranged along the second direction and is spaced apart from and opposite to the tail end of a grid plate system (10) in the first direction; the connecting portion (132) is connected between the two arc-striking ends (131); in the first direction, the connecting portion (132) protrudes in the direction of the arc entrance port (101).

9. The arc extinguishing system according to claim 8, characterized in that: A connecting portion (132) is connected between the two arc striking ends (131), and the connecting portion (132) is in a V-shaped structure.

10. A circuit breaker comprising a contact mechanism, the contact mechanism comprising a moving contact assembly (2) and a pair of stationary contact assemblies (3), characterized in that : Also includes an arc extinguishing system as described in any one of claims 1 to 9, wherein the arc extinguishing system includes two arc extinguishing chambers (1), and the two arc extinguishing chambers (1) are cooperatively arranged on both sides of the moving contact assembly (2), and in the second direction, a moving contact portion of the moving contact assembly (2) and a static contact portion of a static contact assembly (3) are spaced opposite to each other and are correspondingly arranged on both sides of an arc entrance port (101) of an arc extinguishing chamber (1).

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