Arc extinguishing system and direct current equipment

Abstract

The utility model relates to the technical field of low-voltage electric appliances, and discloses an arc extinguishing system and direct current equipment, and the arc extinguishing system comprises an insulating shell and a plurality of arc extinguishing grid sheets which are installed on the insulating shell. An arc extinguishing channel for allowing generation and movement of an electric arc is formed in the insulating shell; the plurality of arc-extinguishing grid plates are located at the outlet of the arc-extinguishing channel and are stacked from the top to the bottom of the insulating shell, a gap is formed between every two adjacent arc-extinguishing grid plates, and the plurality of arc-extinguishing grid plates, close to the bottom of the insulating shell, in the plurality of arc-extinguishing grid plates are arranged in parallel; a plurality of arc-extinguishing grid sheets, close to the top of the insulating shell, in the plurality of arc-extinguishing grid sheets are distributed in a fan shape, and an included angle between extension directions of two arc-extinguishing grid sheets which are farthest from each other in the plurality of arc-extinguishing grid sheets is an acute angle. According to the arc extinguishing system and the direct current equipment, the arc extinguishing effect can be improved, and the arc extinguishing efficiency is improved.

Description

Technical Field

[0001] The present application relates to the technical field of low-voltage electrical appliances, and in particular to an arc extinguishing system and a DC device. Background Art

[0002] When a small circuit breaker is disconnected, a high-temperature and high-pressure arc is easily generated between the moving and static contacts. Since the DC current does not naturally pass through the zero point, the arc is not easy to extinguish after it is generated, which may cause serious consequences such as circuit short circuit and equipment burning.

[0003] In the related art, an arc extinguishing chamber is generally used for arc extinguishing. A plurality of arc extinguishing grids are arranged in the arc extinguishing chamber. The long arc will be moved to the arc extinguishing grids under the impetus of airflow or magnetic field, and divided into multiple short arcs for cooling and extinguishing.

[0004] However, the existing arc extinguishing chamber structure design is unreasonable, and the number of arc extinguishing grids is small, resulting in low arc extinguishing efficiency and very limited arc extinguishing effect. Utility Model Content

[0005] In view of this, the present application provides an arc extinguishing system and a DC device, which can improve the arc extinguishing effect and increase the arc extinguishing efficiency.

[0006] This application specifically adopts the following technical solutions:

[0007] In one aspect, an embodiment of the present application provides an arc extinguishing system, the arc extinguishing system comprising an insulating housing, and a plurality of arc extinguishing grids mounted on the insulating housing;

[0008] The insulating housing is provided with an arc extinguishing channel for allowing the arc to be generated and moved;

[0009] The multiple arc-extinguishing grids are located at the exit of the arc-extinguishing channel and are stacked from the top to the bottom of the insulating shell, with a gap between two adjacent arc-extinguishing grids, wherein several arc-extinguishing grids close to the bottom of the insulating shell among the multiple arc-extinguishing grids are arranged in parallel, and several arc-extinguishing grids close to the top of the insulating shell among the multiple arc-extinguishing grids are distributed in a fan shape, and an angle between the extension directions of two arc-extinguishing grids farthest from each other among the multiple arc-extinguishing grids is an acute angle.

[0010] Optionally, among the plurality of arc-extinguishing grids close to the top of the insulating shell, the arc-extinguishing grid that is closer to the top of the insulating shell is closer to the entrance of the arc-extinguishing channel.

[0011] Optionally, among the plurality of arc-extinguishing grids close to the top of the insulating housing, an angle between extension directions of two adjacent arc-extinguishing grids is in a range of 0-10°.

[0012] Optionally, the plurality of arc-extinguishing grids near the bottom of the insulating shell are divided into a first grid group and a second grid group, the first grid group is farther away from the bottom of the insulating shell than the second grid group, and the arc-extinguishing grids in the first grid group and the arc-extinguishing grids in the second grid group are different in at least one of the following aspects: grid length, grid thickness, and grid spacing.

[0013] Optionally, the grid length of the arc-extinguishing grid in the first grid group is greater than the grid length of the arc-extinguishing grid in the second grid group; and / or,

[0014] The arc-extinguishing grids in the first grid group have a grid thickness that is smaller than the grid thickness of the arc-extinguishing grids in the second grid group; and / or,

[0015] The arc-extinguishing grids in the first grid group are arranged at equal intervals at a first spacing, and the arc-extinguishing grids in the second grid group are arranged at equal intervals at a second spacing, and the first spacing is smaller than the second spacing.

[0016] Optionally, the thickness of the arc-extinguishing grids close to the top of the insulating housing is equal to the thickness of the arc-extinguishing grids in the first grid group.

[0017] Optionally, a plurality of pairs of plug-in slots are arranged in pairs on the insulating housing, and two plug-in slots in each pair of the plug-in slots are respectively located on both sides of the outlet of the arc extinguishing channel;

[0018] The arc extinguishing grid comprises a base and two legs, wherein the two legs are connected to the same side wall of the base and are spaced apart from each other, and an arc extinguishing groove is provided at a portion of the base between the two legs;

[0019] The legs of the arc-extinguishing grids are respectively plugged into the pairs of plug-in slots, and the arc-extinguishing slots of the arc-extinguishing grids are all connected to the outlet of the arc-extinguishing channel, wherein the two arc-extinguishing slots of two adjacent arc-extinguishing grids are staggered.

[0020] Optionally, among the plurality of arc-extinguishing grids, there is a gap between the orthographic projections of the arc-extinguishing grooves of two adjacent arc-extinguishing grids on a set plane, and the set plane is perpendicular to the arrangement direction of the plurality of arc-extinguishing grids close to the bottom of the insulating housing.

[0021] Optionally, the two legs of the arc-extinguishing grid have different lengths, and the distance between the arc-extinguishing groove and the longer leg is smaller than the distance between the arc-extinguishing groove and the shorter leg.

[0022] Optionally, a first opening is provided on the top of the insulating housing, and the first opening is communicated with the arc extinguishing channel;

[0023] The arc extinguishing system further includes an arc striking grid, at least a portion of which extends into the arc extinguishing channel through the first opening.

[0024] Optionally, the first opening is spaced apart from an entrance of the arc extinguishing channel; and / or the first opening is connected to an exit of the arc extinguishing channel.

[0025] Another aspect of the embodiment of the present application provides a DC device, which includes the arc extinguishing system described in the above aspect.

[0026] In the arc extinguishing system provided in the embodiment of the present application, a plurality of arc extinguishing grids are stacked and arranged at intervals at the outlet of the arc extinguishing channel, and these arc extinguishing grids can cool and extinguish the arc coming out of the outlet of the arc extinguishing channel, wherein, since several arc extinguishing grids near the bottom of the insulating shell among the multiple arc extinguishing grids are arranged in parallel, and several arc extinguishing grids near the top of the insulating shell among the multiple arc extinguishing grids are arranged in a fan shape, on the one hand, the number of arc extinguishing grids in the limited space of the arc extinguishing chamber is increased, and on the other hand, the shape of the multiple arc extinguishing grids after arrangement matches the shape of the arc after moving to this position, so that the layout of the arc extinguishing grids in the arc extinguishing chamber is more reasonable, which effectively improves the arc extinguishing effect, improves the arc extinguishing efficiency, and is beneficial to improving the breaking performance of the DC equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 is an exploded diagram of an arc extinguishing system provided in an embodiment of the present application;

[0029] Figure 2 yes Figure 1 A side view of a plurality of arc extinguishing grids stacked and arranged in the arc extinguishing system;

[0030] Figure 3 is a first structural schematic diagram of an insulating housing provided in an embodiment of the present application;

[0031] Figure 4 is a front view of an arc-extinguishing grid provided in an embodiment of the present application;

[0032] Figure 5 yes Figure 1 A schematic diagram of the positional relationship between two adjacent arc extinguishing grids in the arc extinguishing system shown;

[0033] Figure 6yes Figure 5 A front view of two arc-extinguishing grids shown;

[0034] Figure 7 It is a structural schematic diagram of an arc extinguishing system provided in an embodiment of the present application;

[0035] Figure 8 This is a second structural schematic diagram of an insulating shell provided in an embodiment of the present application.

[0036] Reference numerals:

[0037] 1. Insulating housing; 11. Arc extinguishing channel; 111. Exit; 112. Entrance; 12. Top; 121. First opening; 13. Bottom; 131. Second opening; 14. Insertion slot; 15. Reinforcement portion;

[0038] 2. arc extinguishing grid; 21. first grid group; 22. second grid group; 23. base; 24. leg; 25. arc extinguishing groove;

[0039] 3. Arc striking grid;

[0040] 4. Arc isolation parts. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0042] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0043] The present application embodiment provides an arc extinguishing system, such as Figure 1 As shown, the arc extinguishing system includes an insulating housing 1 and a plurality of arc extinguishing grids 2 mounted on the insulating housing 1 .

[0044] The insulating housing 1 is made of insulating material to prevent charged free gas from overflowing after an arc is generated. In some examples, the insulating housing 1 may be an insulating gas-producing housing made of insulating gas-producing material. After an arc is generated, the insulating gas-producing housing can generate gas and form an airflow under the action of high temperature and high pressure, thereby pushing the arc to move and lengthen, and cooling the arc through the airflow. Exemplarily, the material of the insulating gas-producing housing may be PA66.

[0045] like Figure 1 and Figure 3As shown, an arc extinguishing channel 11 for allowing an arc to be generated and moved is formed on the insulating housing 1, and the arc extinguishing channel 11 has an entrance 112 and an exit 111, wherein the entrance 112 is used for the moving contact to enter and exit the arc extinguishing channel 11 when moving; and the exit 111 is used for the pushed arc to pass through. In some examples, the entrance 112 and the exit 111 of the arc extinguishing channel 11 are arranged opposite to each other and are respectively located on the opposite side walls of the insulating housing 1.

[0046] A plurality of arc extinguishing grids 2 are located at the outlet 111 of the arc extinguishing channel 11, and are stacked and arranged in intervals from the top 12 to the bottom 13 of the insulating housing 1, that is, there is a gap between two adjacent arc extinguishing grids 2. The bottom 13 of the insulating housing 1 is close to the contact position of the static contact and the moving contact, and the top 12 is opposite to the bottom 13. Figure 2 As shown, the plurality of arc-extinguishing grids 2 can be divided into two parts according to their arrangement, wherein a plurality of grids close to the bottom 13 of the insulating housing 1 are the first part, and the plurality of arc-extinguishing grids 2 in the first part are arranged in a direction from the top 12 to the bottom 13 of the insulating housing 1 (i.e. Figure 2 The plurality of arc-extinguishing grids 2 near the top 12 of the insulating housing 1 are the second part, and the plurality of arc-extinguishing grids 2 in the second part are distributed in a fan shape, that is, the line connecting the centers of the arc-extinguishing grids 2 is an arc shape. Figure 2 As shown, for the two arc-quenching grids 2 ranked first and last among all the arc-quenching grids 2, the distance between the two arc-quenching grids 2 is the farthest, and the angle α between the extension directions of the two arc-quenching grids 2 is an acute angle less than 90°.

[0047] Therefore, in the arc extinguishing system provided in the embodiment of the present application, a plurality of arc extinguishing grids 2 are stacked and arranged at intervals at the outlet 111 of the arc extinguishing channel 11, and these arc extinguishing grids 2 can cool and extinguish the arc coming out of the outlet 111 of the arc extinguishing channel 11, wherein, since several arc extinguishing grids 2 among the multiple arc extinguishing grids 2 close to the bottom 13 of the insulating shell 1 are arranged in parallel, and several arc extinguishing grids 2 among the multiple arc extinguishing grids 2 close to the top 12 of the insulating shell 1 are arranged in a fan shape, on the one hand, the number of arc extinguishing grids 2 in the limited space of the arc extinguishing chamber is increased, and on the other hand, the shape of the multiple arc extinguishing grids 2 after arrangement matches the shape of the arc after moving to this position, so that the layout of the arc extinguishing grids 2 in the arc extinguishing chamber is more reasonable, which effectively improves the arc extinguishing effect, improves the arc extinguishing efficiency, and is beneficial to improving the breaking performance of the DC equipment.

[0048] For the arc-extinguishing grids 2 in the second part, that is, the arc-extinguishing grids 2 close to the top 12 of the insulating housing 1, in some embodiments of the present application, as Figure 2As shown, there is an angle between the extension directions of any two adjacent arc-extinguishing grids 2, and the angle range of the angle is 0-10°. Optionally, the angle is greater than 0° and less than 10°, such as 5°, 7°, 9°, etc.

[0049] Exemplarily, the arc-extinguishing grids 2 near the top 12 of the insulating housing 1 include a first grid, a second grid, and a third grid arranged in sequence, and there is a first angle between the extension direction of the first grid and the extension direction of the second grid, the first angle is greater than 0° and less than 10°; there is a second angle between the extension direction of the second grid and the extension direction of the third grid, the second angle is greater than 0° and less than 10°. The relationship between the first angle and the second angle is determined according to actual needs, for example, the two angles can be equal or unequal.

[0050] For the arc-extinguishing grids 2 in the second part, that is, the arc-extinguishing grids 2 close to the bottom 13 of the insulating housing 1, in some embodiments of the present application, see Figure 2 , these arc-extinguishing grids 2 can be further divided into a first grid group 21 and a second grid group 22, the first grid group 21 and the second grid group 22 each include a plurality of arc-extinguishing grids 2 arranged in parallel, and the first grid group 21 is farther away from the bottom 13 of the insulating shell 1 than the second grid group 22, that is, the distance between any arc-extinguishing grid 2 in the first grid group 21 and the bottom 13 of the insulating shell 1 is greater than the distance between any arc-extinguishing grid 2 in the second grid group 22 and the bottom 13 of the insulating shell 1.

[0051] Continue to see Figure 2 , any arc-extinguishing grid 2 in the first grid group 21 and any arc-extinguishing grid 2 in the second grid group 22 are different in at least one of grid length, grid thickness and grid spacing. Wherein. The length direction of the grid is Figure 2 The lateral direction of the viewing angle shown, the thickness direction of the grid is Figure 2 In the longitudinal direction of the viewing angle shown, the grid pitch refers to the distance between two adjacent grids.

[0052] Optionally, the arc-extinguishing grids 2 in the first grid group 21 have the same length, thickness, and grid spacing; the arc-extinguishing grids 2 in the second grid group 22 have the same length, thickness, and grid spacing.

[0053] Alternatively, if Figure 2 As shown, the length of any arc-extinguishing grid 2 in the first grid group 21 is greater than the length of any arc-extinguishing grid 2 in the second grid group 22 .

[0054] Alternatively, if Figure 2As shown, the thickness T1 of any arc-extinguishing grid 2 in the first grid group 21 is smaller than the thickness T2 of any arc-extinguishing grid 2 in the second grid group 22 .

[0055] Alternatively, if Figure 2 As shown, there is a first distance D1 between any two adjacent arc-extinguishing grids 2 in the first grid group 21, and there is a second distance D2 between any two adjacent arc-extinguishing grids 2 in the second grid group 22, and the first distance D1 is smaller than the second distance D2.

[0056] Optionally, continue to see Figure 2 , the grid thickness T3 of any arc-extinguishing grid 2 in the first part is equal to the grid thickness T1 of any arc-extinguishing grid 2 in the first grid group 21 .

[0057] By adopting the above-mentioned arrangement, the layout of the arc extinguishing grids 2 in the arc extinguishing chamber in the related technology is changed, so that the number of arc extinguishing grids 2 is increased as much as possible in a limited space. Therefore, the arc in the arc extinguishing chamber can be attracted by the arc extinguishing grids 2, thereby lengthening the arc and dividing the arc, achieving a better cooling effect, increasing the arcing voltage and reducing the burning of the arc extinguishing grids 2 by the arc, which is helpful to improve the breaking performance of DC equipment such as DC circuit breakers.

[0058] In some embodiments of the present application, Figure 3 As shown, the insulating housing 1 is provided with a plurality of pairs of insertion slots 14, and the two insertion slots 14 in each pair of insertion slots 14 are arranged at intervals and are respectively located at opposite sides of the outlet 111 of the arc extinguishing channel 11. Figure 4 As shown, each arc-extinguishing grid 2 includes a base 23 and two legs 24, the two legs 24 are connected to the side wall of the same side of the base 23 and are spaced apart from each other, and a portion of the base 23 located between the two legs 24 is provided with an arc-extinguishing groove 25, which penetrates the arc-extinguishing grid 2 along the thickness direction of the arc-extinguishing grid 2.

[0059] During installation, the two legs 24 of each arc-extinguishing grid 2 are inserted into a pair of insertion grooves 14, so as to fix the arc-extinguishing grid 2 on the insulating housing 1. Similarly, multiple arc-extinguishing grids 2 are respectively inserted into multiple pairs of insertion grooves 14 for fixation; the arc-extinguishing grooves 25 of the multiple arc-extinguishing grids 2 are all connected to the outlet 111 of the arc-extinguishing channel 11.

[0060] By adopting the above design, it can be ensured that the arc can be driven by the airflow and move through the outlet 111 of the arc extinguishing channel 11 to the arc extinguishing groove 25 to be divided into multiple short arcs. Since each arc extinguishing grid 2 that is insulated from each other is equivalent to an electrode, many cathode and anode voltage drops can be formed to cool and extinguish each short arc segment respectively, thereby increasing the arc burning voltage, improving the arc extinguishing efficiency, and improving the arc extinguishing effect.

[0061] In some embodiments, Figure 5 As shown, the two arc extinguishing grooves 25 of two adjacent arc extinguishing grids 2 are staggered. It should be understood that the staggered arrangement of the two arc extinguishing grooves 25 means that the central axes of the two arc extinguishing grooves 25 are not colinear.

[0062] Alternatively, if Figure 6 As shown, among the arc-extinguishing grids 2 in the second part, there is a gap between the orthographic projections of the arc-extinguishing grooves 25 of two adjacent arc-extinguishing grids 2 on the set plane, wherein the set plane is a plane perpendicular to the arrangement direction of the arc-extinguishing grids 2 in the first part.

[0063] Optionally, among all arc-extinguishing grids 2 , there is a gap between the arc-extinguishing grooves 25 of two adjacent arc-extinguishing grids 2 in their orthographic projections on the set plane.

[0064] Therefore, in the embodiment of the present application, by designing the arrangement of several arc extinguishing grids 2 including at least the first grid group 21 and the second grid group 22 in the arc extinguishing chamber to be staggered, it is achieved that the arc can be divided into multiple short arcs when moving to the arc extinguishing groove 25, and the short arcs are separated and discontinuous from each other, thereby further improving the cooling efficiency of each arc segment and further improving the arc extinguishing effect.

[0065] In some embodiments of the present application, Figure 4 As shown, the lengths L1 and L2 of the two legs 24 of the same arc-extinguishing grid 2 are different, wherein the distance between the arc-extinguishing groove 25 and the longer leg 24 is D3, and the distance between the arc-extinguishing groove 25 and the shorter leg 24 is D4, and D3 is smaller than D4. Therefore, if the arc-extinguishing grooves 25 of two adjacent arc-extinguishing grids 2 are to be arranged in a staggered manner, it is sufficient to relatively flip the two arc-extinguishing grids 2 by 180 degrees, that is, the structures of the arc-extinguishing grids 2 in the arc-extinguishing system are the same, thereby reducing the manufacturing cost of the arc-extinguishing grids 2.

[0066] In some embodiments of the present application, Figure 3 As shown, the top 12 of the insulating housing 1 is provided with a first opening 121, and the first opening 121 is connected to the arc extinguishing channel 11. Figure 7 As shown, the arc extinguishing system further includes an arc striking grid 3 , at least a portion of which extends into the arc extinguishing channel 11 through the first opening 121 .

[0067] The arc striking grid 3 can reduce or eliminate the gap between the arc angle and the arc extinguishing grid 2, accelerate the movement of the arc root and reduce the arc root temperature, and at the same time promote the arc to move to the arc extinguishing grid 2 as soon as possible for cutting, thereby accelerating the arc extinguishing speed.

[0068] In some embodiments, Figure 8As shown, the first opening 121 is spaced apart from the inlet 112 of the arc extinguishing channel 11 , and / or the first opening 121 is communicated with the outlet 111 of the arc extinguishing channel 11 .

[0069] The first opening 121 and the entrance 112 of the arc extinguishing channel 11 are separated by a reinforcement portion 15 , which is, for example, a reinforcing rib and mainly serves to increase the structural strength of the top 12 of the insulating housing 1 to prevent the top 12 of the insulating housing 1 from deformation.

[0070] The first opening 121 is connected to the outlet 111 of the arc extinguishing channel 11 , thereby ensuring that the arc root can move to the position of the arc extinguishing grid 2 after the arc is generated, thereby avoiding ablation of the insulating housing 1 .

[0071] In some embodiments of the present application, the bottom 13 of the insulating housing 1 is provided with a second opening 131, and the second opening 131 is communicated with the arc extinguishing channel 11, and is used for the static contact to extend into the arc extinguishing channel 11. Exemplarily, the static contact can be installed at the bottom 13 of the insulating housing 1, and the contact point on the static contact extends into the arc extinguishing channel 11 through the second opening 131, so as to make contact and disconnect with the moving contact inside the arc extinguishing channel 11, so as to ensure that an arc is generated in the arc extinguishing channel 11.

[0072] In some embodiments of the present application, Figure 1 As shown, the arc extinguishing system may further include two arc-isolating members 4, which are respectively located at two sides of multiple pairs of plug-in slots 14 on the insulating housing 1 and connected to the arc-extinguishing grid 2, thereby achieving fixation between the arc-isolating members 4, the insulating housing 1 and the arc-extinguishing grid 2. Optionally, the arc-isolating members 4 are arc-isolating plates.

[0073] The embodiment of the present application further provides a DC device, such as a DC circuit breaker, a DC switch, etc. The DC device includes a contact system and an arc extinguishing system as described in any of the above embodiments.

[0074] The DC device provided in the embodiment of the present application has excellent breaking performance and safety performance due to the adoption of the above-mentioned arc extinguishing system.

[0075] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features.

[0076] The above description is only for the purpose of facilitating those skilled in the art to understand the technical solution of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An arc extinguishing system, characterized in that: The arc extinguishing system comprises an insulating housing (1) and a plurality of arc extinguishing grids (2) mounted on the insulating housing (1); The insulating housing (1) is provided with an arc extinguishing channel (11) for allowing the arc to be generated and moved; The plurality of arc-extinguishing grids (2) are located at an outlet (111) of the arc-extinguishing channel (11) and are arranged in layers from the top (12) to the bottom (13) of the insulating housing (1), with a gap between two adjacent arc-extinguishing grids (2), wherein a plurality of arc-extinguishing grids (2) close to the bottom (13) of the insulating housing (1) among the plurality of arc-extinguishing grids (2) are arranged in parallel, a plurality of arc-extinguishing grids (2) close to the top (12) of the insulating housing (1) among the plurality of arc-extinguishing grids (2) are distributed in a fan shape, and an angle between the extension directions of two arc-extinguishing grids (2) that are farthest apart from each other among the plurality of arc-extinguishing grids (2) is an acute angle.

2. The arc extinguishing system according to claim 1, characterized in that: Among the plurality of arc-extinguishing grids (2) close to the top (12) of the insulating housing (1), the arc-extinguishing grid (2) that is closer to the top (12) of the insulating housing (1) is closer to the entrance (112) of the arc-extinguishing channel (11).

3. The arc extinguishing system according to claim 1 or 2, characterized in that: Among the plurality of arc-extinguishing grids (2) close to the top (12) of the insulating housing (1), the angle between the extension directions of two adjacent arc-extinguishing grids (2) is in the range of 0-10°.

4. The arc extinguishing system according to claim 1, characterized in that: The plurality of arc-extinguishing grids (2) close to the bottom (13) of the insulating housing (1) are divided into a first grid group (21) and a second grid group (22); the first grid group (21) is farther from the bottom (13) of the insulating housing (1) than the second grid group (22); and the arc-extinguishing grids (2) in the first grid group (21) and the arc-extinguishing grids (2) in the second grid group (22) are different in at least one of the following aspects: grid length, grid thickness, and grid spacing.

5. The arc extinguishing system according to claim 4, characterized in that: The grid length of the arc-extinguishing grid (2) in the first grid group (21) is greater than the grid length of the arc-extinguishing grid (2) in the second grid group (22); and / or, The grid thickness of the arc-extinguishing grid (2) in the first grid group (21) is smaller than the grid thickness of the arc-extinguishing grid (2) in the second grid group (22); and / or, A plurality of arc-extinguishing grids (2) in the first grid group (21) are arranged at equal intervals at a first spacing, and a plurality of arc-extinguishing grids (2) in the second grid group (22) are arranged at equal intervals at a second spacing, wherein the first spacing is smaller than the second spacing.

6. The arc extinguishing system according to claim 4, characterized in that: The thickness of the arc-extinguishing grids (2) close to the top (12) of the insulating housing (1) is equal to the thickness of the arc-extinguishing grids (2) in the first grid group (21).

7. The arc extinguishing system according to claim 1, characterized in that: The insulating housing (1) is provided with a plurality of pairs of plug-in slots (14) in pairs, and the two plug-in slots (14) in each pair of the plug-in slots (14) are respectively located on both sides of an outlet (111) of the arc extinguishing channel (11); The arc extinguishing grid (2) comprises a base (23) and two legs (24), wherein the two legs (24) are connected to the same side wall of the base (23) and are spaced apart from each other, and an arc extinguishing groove (25) is provided at a portion of the base (23) located between the two legs (24); The legs (24) of the plurality of arc-extinguishing grids (2) are respectively plugged into the plurality of pairs of plug-in slots (14), and the arc-extinguishing slots (25) of the plurality of arc-extinguishing grids (2) are all connected to the outlet (111) of the arc-extinguishing channel (11), wherein the two arc-extinguishing slots (25) of two adjacent arc-extinguishing grids (2) are staggered.

8. The arc extinguishing system according to claim 7, characterized in that: Among the plurality of arc-extinguishing grids (2), there is a gap between the orthographic projections of the arc-extinguishing grooves (25) of two adjacent arc-extinguishing grids (2) on a set plane, and the set plane is perpendicular to the arrangement direction of the plurality of arc-extinguishing grids (2) close to the bottom (13) of the insulating housing (1).

9. The arc extinguishing system according to claim 7, characterized in that: The two legs (24) of the arc extinguishing grid (2) have different lengths, and the distance between the arc extinguishing groove (25) and the longer leg (24) is smaller than the distance between the arc extinguishing groove (25) and the shorter leg (24).

10. The arc extinguishing system according to claim 1, characterized in that: The top (12) of the insulating housing (1) is provided with a first opening (121), and the first opening (121) is in communication with the arc extinguishing channel (11); The arc extinguishing system further comprises an arc striking grid (3), at least a portion of which extends into the arc extinguishing channel (11) through the first opening (121).

11. The arc extinguishing system according to claim 10, characterized in that: The first opening (121) is spaced apart from the inlet (112) of the arc extinguishing channel (11); and / or the first opening (121) is connected to the outlet (111) of the arc extinguishing channel (11).

12. A DC device, characterized in that: The DC device comprises the arc extinguishing system according to any one of claims 1-11.

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