Double-side-wall insulated gate sheet, non-polar arc extinguishing structure and direct-current circuit breaker

Abstract

The utility model discloses a double-side-wall insulated gate sheet, a non-polar arc extinguishing structure and a direct-current circuit breaker, and belongs to the technical field of low-voltage electric appliances. The double-side-wall insulated gate piece comprises a side wall insulated gate piece set, the side wall insulated gate piece set is composed of a plurality of insulated gate pieces, the insulated gate pieces are arranged to be perpendicular to an arc isolation wall in the direct-current circuit breaker, and the insulated gate pieces are arranged in an extending mode in the arc movement direction. The technical problems that arc extinguishing of an insulated gate sheet of a direct-current arc only depends on the action of a magnetic field and an airflow field of the arc, the lengthening and cooling action of the insulated gate sheet on the arc is limited, and an external magnetic field has directivity and cannot meet the requirement of non-polar direct-current arc breaking are solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of low-voltage electrical appliances, and in particular relates to a double-side wall insulating grid, a non-polarity arc extinguishing structure and a DC circuit breaker. Background Art

[0002] The existing technology of low-voltage DC circuit breakers achieves arc extinguishing by increasing the arc voltage and limiting the current from crossing zero. Insulated grid arc extinguishing is a common method. When the arc enters the arc extinguishing area, it is blocked by the insulating grid, and the arc bends under the action of external force, thereby lengthening the arc and enhancing cooling, thereby achieving the purpose of increasing the arc voltage and extinguishing the arc. However, for DC arcs, the arc extinguishing of the insulating grid only relies on the magnetic field and airflow field of the arc itself, which greatly limits the elongation and cooling effect of the insulating grid on the arc, and the external magnetic field is directional and cannot meet the requirements of non-polar DC arc interruption. Utility Model Content

[0003] In order to overcome the shortcomings of the above-mentioned prior art, the purpose of the utility model is to provide a double-side wall insulating grid, a non-polarity arc extinguishing structure and a DC circuit breaker, so as to solve the technical problem that the arc extinguishing of the insulating grid of the DC arc only relies on the magnetic field and airflow field of the arc itself, which limits the elongation and cooling effect of the insulating grid on the arc, and the external magnetic field is directional and cannot meet the technical problem of the demand for non-polarity DC arc breaking.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] The utility model provides a double-side wall insulating grid, comprising a side wall insulating grid group, wherein the side wall insulating grid group is composed of a plurality of insulating grids, the insulating grids are arranged perpendicular to arc isolation walls in a DC circuit breaker, and the insulating grids are extended along the arc movement direction.

[0006] In a specific implementation process, the width of the insulating grid is less than half of the distance between the two arc isolation walls.

[0007] In a specific implementation process, a plurality of discontinuous intervals are arranged on the insulating grid, and the discontinuous intervals are arranged along the length direction of the insulating grid.

[0008] In a specific implementation process, the plurality of insulating grid plates are continuously arranged to form a sidewall insulating grid plate group.

[0009] In a specific implementation process, the insulating grid is in an arc shape.

[0010] In a specific implementation process, the two groups of side wall insulating grid plates are respectively arranged on the arc isolation walls on both sides of the moving contact and the stationary contact in the DC circuit breaker.

[0011] The utility model provides a non-polarity arc extinguishing structure, including double-side wall insulating grids, a moving contact, a stationary contact, an arc-isolating wall, a moving arc angle, a stationary arc angle and a permanent magnet group;

[0012] The moving contact is connected to the moving arc angle through a soft wire, and the static contact is fixedly connected to the static arc angle; the arc isolation wall is arranged on both sides of the moving contact and the static contact;

[0013] The arc isolation wall comprises a first arc isolation wall and a second arc isolation wall; the double side wall insulating grids comprise a first side wall insulating grid group and a second side wall insulating grid group; the first side wall insulating grid group and the second side wall insulating grid group are respectively arranged on the first arc isolation wall and the second arc isolation wall;

[0014] The permanent magnet group includes a first permanent magnet, a second permanent magnet and a third permanent magnet;

[0015] The first permanent magnet is arranged on the side of the moving arc angle away from the moving contact and the stationary contact; the second permanent magnet is arranged on the side of the first arc isolation wall away from the first side wall insulation grid group; the third permanent magnet is arranged on the side of the second arc isolation wall away from the second side wall insulation grid group;

[0016] The first polarity surface of the first permanent magnet faces the moving arc angle; the first polarity surface of the second permanent magnet is arranged opposite to the first polarity surface of the third permanent magnet, and the polarity of the first polarity surface of the second permanent magnet is the same as the first polarity surface of the third permanent magnet, and is opposite to the polarity of the first polarity surface of the first permanent magnet.

[0017] In a specific implementation process, the moving contact can move relative to the stationary contact to achieve closing and separation of the moving contact and the stationary contact.

[0018] In the specific implementation process, one end of the static contact overlaps and connects with one end of the static arc angle, one side of the dynamic arc angle is arranged opposite to one side of the static arc angle, and an arc extinguishing chamber is formed between one side of the dynamic arc angle and one side of the static arc angle.

[0019] The utility model provides a DC circuit breaker, comprising the double-side wall insulating grid and the non-polarity arc extinguishing structure.

[0020] Compared with the prior art, the utility model has the following beneficial effects:

[0021] The utility model provides a double-side wall insulating grid, a pair of insulating grid groups relatively arranged on the arc isolation wall of the circuit breaker cooperate with an external magnetic field with the function of distinguishing the direction of the arc current, so that the insulating grid can give full play to the arc elongation and cooling effect of the insulating grid, and is effective for DC arcs in two current directions at the same time, and the scheme is small in size, low in cost and simple in structure. Specifically, since the insulating grid is arranged perpendicular to the arc isolation wall to enhance the arc guiding effect, it can more effectively guide the arc to move along the surface of the arc isolation wall in synergy with the magnetic field component generated by the permanent magnet, and the vertical arrangement ensures that the arc is more directly and clearly guided when moving, and reduces the possibility of the arc deviating from the predetermined path. The insulating grid extends along the arc movement direction to improve the arc elongation efficiency, which means that the arc will be further elongated when passing through each grid. The elongated arc not only increases the heat dissipation area, but also helps to disperse the energy of the arc, making it easier to be extinguished. The above structure can enhance the arc cooling effect. As the arc moves between the side wall insulating grid groups, it contacts multiple insulating grids, thereby increasing the frequency and efficiency of heat exchange. Frequent heat exchange helps to quickly reduce the temperature of the arc and further accelerate the arc extinguishing process.

[0022] The utility model also provides a non-polar arc extinguishing structure based on double-side wall insulating grids. The double-side wall insulating grids play a vital role in the non-polar arc extinguishing structure. The double-side wall insulating grids interact effectively with the arc on the arc isolation wall to lengthen and cool the arc, thereby promoting the rapid extinction of the arc. Specifically, when the moving and static contacts separate to generate an arc, the double-side wall insulating grids can guide the arc to move along the surface of the arc isolation wall through their special structural design, increase the contact area between the arc and the wall, and then lengthen the arc and increase its heat dissipation area. At the same time, through heat exchange, the insulating grids can effectively cool the arc, reduce its temperature, and make it easier to be extinguished. The permanent magnet group works in conjunction with the double-side wall insulating grids to jointly optimize the movement and extinction process of the arc, and combines the two methods of magnetic field control and physical structure guidance to effectively control the movement trajectory of the arc, and significantly improve the efficiency of arc extinguishing by lengthening and cooling the arc.

[0023] Furthermore, the first magnetic field component generated by the first permanent magnet in the permanent magnet group, together with the second permanent magnet and the third permanent magnet, strengthens the first magnetic field component, so that the direction of the arc current can effectively guide the arc to the arc isolation wall surface, thereby ensuring that the arc moves along a predetermined path. In addition, the second permanent magnet and the third permanent magnet not only strengthen the first magnetic field component, but also generate magnetic field components pointing to each other. The additional magnetic field component can further guide the arc to move along the arc isolation wall surface, ensuring that the arc will not directly cross the air gap between the contacts, thereby improving the accuracy and reliability of arc control.

[0024] The utility model also provides a DC circuit breaker based on double-side wall insulating grids and a non-polar arc extinguishing structure. The non-polar arc extinguishing structure accurately controls the magnetic field distribution to ensure that the arc can be quickly guided to the arc isolation wall surface after it is generated, and is effectively elongated and cooled under the action of the double-side wall insulating grids, thereby significantly improving the arc extinguishing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the non-polarity arc extinguishing structure of the utility model;

[0026] Figure 2 It is a schematic diagram of a permanent magnet group of the non-polarity arc extinguishing structure of the utility model;

[0027] Figure 3 It is a schematic diagram of the insulating grid plate group on the upper side wall of the arc isolation wall in an embodiment of the utility model.

[0028] Among them: 1-moving contact; 2-static contact; 3-arc isolation wall; 31-first arc isolation wall; 311-first side wall insulating grid group; 3111-first insulating grid; 3112-first discontinuous interval; 32-second arc isolation wall; 321-second side wall insulating grid group; 3211-second insulating grid; 4-moving arc angle; 5-static arc angle; 6-permanent magnet group; 61-first permanent magnet; 62-second permanent magnet; 63-third permanent magnet. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0030] It should be noted that the terms "first", "second", etc. in the specification and claims of the utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the utility model described here can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0031] The utility model is further described in detail below with reference to the accompanying drawings:

[0032] See also Figures 1 to 3 The utility model provides a double-side wall insulating grid, a non-polarity arc extinguishing structure and a DC circuit breaker.

[0033] like Figure 3 As shown, the first aspect of the utility model provides a double-side wall insulating grid, which includes a side wall insulating grid group, which is composed of a plurality of insulating grids. The insulating grids are arranged perpendicular to the arc isolation wall 3 in the DC circuit breaker, and the insulating grids are extended along the arc movement direction.

[0034] In the specific implementation process, several insulating grids are continuously arranged to form a side wall insulating grid group, the width of the insulating grid is less than half of the distance between the two arc isolation walls 3, and several discontinuous intervals are arranged on the insulating grid, and the discontinuous intervals are arranged along the length direction of the insulating grid.

[0035] Two groups of side wall insulating grid plates are respectively arranged on arc isolation walls 3 on both sides of a moving contact 1 and a stationary contact 2 in a DC circuit breaker.

[0036] Among them, the intermittent interval can optimize the arc dispersion effect so that the arc will not continuously contact the same surface when passing through the insulating grid, but will be dispersed into multiple small areas. This dispersion effect helps to increase the contact points between the arc and the grid, further lengthen the arc, and promote the dissipation of the arc energy. It can also enhance the arc cooling effect. Since the arc is dispersed into multiple small areas, the heat exchange area between each area and the insulating grid increases, thereby improving the arc cooling efficiency. At the same time, the intermittent interval also helps to increase the convection between the arc and the surrounding air, further promoting the cooling of the arc. Since the shape and movement of the arc may change due to factors such as the current size and switching speed, the design of the intermittent interval enables the insulating grid to adapt to different arc shapes more flexibly, ensuring that the arc can be effectively lengthened and cooled under various conditions.

[0037] The insulating grids extend in the direction of the arc, which means that the arc is further elongated as it passes through each grid. The elongated arc not only increases the heat dissipation area, but also helps to disperse the energy of the arc, making it easier to extinguish.

[0038] Further preferably, the insulating grid is in an arc shape. The insulating grid is made of a high temperature resistant insulating material.

[0039] like Figure 1 and Figure 2 As shown, the second aspect of the utility model provides a non-polarity arc extinguishing structure, including double-side wall insulating grids, a moving contact 1, a stationary contact 2, an arc isolation wall 3, a moving arc angle 4, a stationary arc angle 5 and a permanent magnet group 6.

[0040] The moving contact 1 is connected to the moving arc angle 4 through a soft wire, and the static contact 2 is fixedly connected to the static arc angle 5; the arc isolation wall 3 is arranged on both sides of the moving contact 1 and the static contact 2; wherein, the moving contact 1 can move relative to the static contact 2 to realize the closing and separation of the moving contact 1 and the static contact 2, one end of the static contact 2 overlaps and connects with one end of the static arc angle 5, one side of the moving arc angle 4 is arranged opposite to one side of the static arc angle 5, and an arc extinguishing chamber is formed between one side of the moving arc angle 4 and one side of the static arc angle 5.

[0041] The arc isolation wall 3 includes a first arc isolation wall 31 and a second arc isolation wall 32; the double sidewall insulating grids include a first sidewall insulating grid group 311 and a second sidewall insulating grid group 321; the first sidewall insulating grid group 311 and the second sidewall insulating grid group 321 are respectively arranged on the first arc isolation wall 31 and the second arc isolation wall 32.

[0042] The permanent magnet group 6 includes a first permanent magnet 61, a second permanent magnet 62 and a third permanent magnet 63; the first permanent magnet 61 is arranged on the side of the moving arc angle 4 away from the moving contact 1 and the stationary contact 2; the second permanent magnet 62 is arranged on the side of the first arc isolation wall 31 away from the first side wall insulating grid group 311; the third permanent magnet 63 is arranged on the side of the second arc isolation wall 32 away from the second side wall insulating grid group 321; the first polarity surface of the first permanent magnet 61 faces the moving arc angle 4; the first polarity surface of the second permanent magnet 62 is arranged opposite to the first polarity surface of the third permanent magnet 63, and the first polarity surface of the second permanent magnet 62 is the same as the first polarity surface of the third permanent magnet 63, and is opposite to the polarity of the first polarity surface of the first permanent magnet 61.

[0043] The first permanent magnet 61 generates a first magnetic field component in the area between the moving contact 1, the stationary contact 2, the arc isolation wall 3, the moving arc angle 4 and the stationary arc angle 5, and the first magnetic field component is parallel to the arc isolation wall 3. The second permanent magnet 62 and the third permanent magnet 63 generate a second magnetic field component close to the second permanent magnet 62 pointing to the third permanent magnet 63 and a third magnetic field component close to the third permanent magnet 63 pointing to the second permanent magnet 62.

[0044] When the current direction of the arc generated by the separation of the moving contact 1 and the stationary contact 2 in the DC circuit breaker is directed from the moving contact 1 to the stationary contact 2, the arc is deflected toward the second permanent magnet 62 under the action of the first magnetic field component, and moves along the surface of the first arc isolation wall 31 and passes through the first side wall insulating grid group 311 under the action of the second magnetic field component.

[0045] When the current direction of the arc generated by the separation of the moving contact 1 and the stationary contact 2 in the DC circuit breaker is directed from the stationary contact 2 to the moving contact 1, the arc is deflected toward the third permanent magnet 63 under the action of the first magnetic field component, and moves along the surface of the second arc isolation wall 32 and passes through the second side wall insulating grid group 321 under the action of the third magnetic field component.

[0046] The first magnetic field component generated by the first permanent magnet 61 is parallel to the arc isolation wall 3, which can ensure that the arc is accurately guided to the surface of the arc isolation wall 3 after it is generated. The magnetic field component parallel to the arc isolation wall 3 enables the arc to move along a predetermined path without randomly drifting or crossing the gap between the contacts. The second magnetic field component and the third magnetic field component generated by the second permanent magnet 62 and the third permanent magnet 63 further enhance the stability of the arc control. These two magnetic field components not only help maintain the movement of the arc along the arc isolation wall 3, but also to some extent "bind" the arc to prevent it from escaping the predetermined path. Regardless of how the direction of the arc current changes, this magnetic field configuration can effectively control and guide the arc. When the current direction changes, the arc will change its direction of movement under the action of the corresponding magnetic field component, but it will always keep moving on the surface of the arc isolation wall and be effectively stretched and cooled by the insulating grid.

[0047] The third aspect of the utility model provides a DC circuit breaker, comprising the above-mentioned double-side wall insulating grid and non-polarity arc extinguishing structure.

[0048] The above-mentioned DC circuit breaker uses a non-polar arc extinguishing structure to precisely control the magnetic field distribution, ensuring that the arc can be quickly guided to the surface of the arc isolation wall after it is generated, and is effectively elongated and cooled under the action of the double-side wall insulating grid, thereby significantly improving the arc extinguishing efficiency, allowing the DC circuit breaker to quickly cut off the arc in a short time, thereby protecting the safety of circuits and equipment.

[0049] Example

[0050] like Figure 3 As shown, the first aspect of this embodiment provides a double side wall insulating grid, which includes a side wall insulating grid group, and the side wall insulating grid group has a first side wall insulating grid group 311 and a second side wall insulating grid group 321 respectively arranged on the arc isolation wall 3 on both sides of the moving contact 1 and the stationary contact 2 of the circuit breaker, the first side wall insulating grid group 311 is arranged on the first arc isolation wall 31, and the second side wall insulating grid group 321 is arranged on the second arc isolation wall 32.

[0051] Among them, the first side wall insulating grid plate group 311 includes one or more first insulating grid plates 3111 perpendicular to the surface of the first arc isolation wall 31, and the first insulating grid plates 3111 extend along the direction of arc movement; the second side wall insulating grid plate group 321 includes one or more second insulating grid plates 3211 perpendicular to the surface of the second arc isolation wall 32, and the second insulating grid plates 3211 extend along the direction of arc movement.

[0052] The width of the first insulating gate plate 3111 of the first side wall insulating gate plate group 311 is smaller than half of the distance between the first arc isolation wall 31 and the second arc isolation wall 32, and the width of the second insulating gate plate 3211 of the second side wall insulating gate plate group 321 is also smaller than half of the distance between the first arc isolation wall 31 and the second arc isolation wall 32.

[0053] The first sidewall insulating grid plate group 311 is composed of one or more continuous first insulating grid plates 3111, and one or more first discontinuous intervals 3112 are further arranged along the length direction of the first insulating grid plates 3111. The second sidewall insulating grid plate group 321 is composed of one or more continuous second insulating grid plates 3211, and one or more second discontinuous intervals are further arranged along the length direction of the second insulating grid plates 3211.

[0054] The first sidewall insulating grid plate group 311 includes one or more flat first insulating grid plates 3111 along the arc movement direction, and may also include one or more first insulating grid plates 3111 along the arc movement direction, that is, the shape of the first insulating grid plates 3111 is arc-shaped. The second sidewall insulating grid plate group 321 includes one or more flat second insulating grid plates 3211 along the arc movement direction, and may also include one or more second insulating grid plates 3211 along the arc movement direction, that is, the shape of the second insulating grid plates 3211 is arc-shaped.

[0055] The material of the insulating grid plates, namely the first insulating grid plate 3111 and the second insulating grid plate 3211, is a high temperature resistant insulating material.

[0056] like Figure 1 and Figure 2 As shown, this embodiment also provides a non-polarity arc extinguishing structure, which has the above double side wall insulation grids, and also includes a moving contact 1, a stationary contact 2, a moving arc angle 4, a stationary arc angle 5, and a permanent magnet group 6. The permanent magnet group 6 includes a first permanent magnet 61 arranged on the side of the moving arc angle 4 away from the moving contact 1 and the stationary contact 2, and the first polarity surface of the first permanent magnet 61 faces the moving arc angle 4. The permanent magnet group 6 also includes a second permanent magnet 62 arranged on the side of the first arc isolation wall 31 away from the first side wall insulation grid group 311, and a third permanent magnet 63 arranged on the side of the second arc isolation wall 32 away from the second side wall insulation grid group 321. The first polarity surface of the second permanent magnet 62 is arranged opposite to the first polarity surface of the third permanent magnet 63, and the first polarity surface of the second permanent magnet 62 is the same as the first polarity surface of the third permanent magnet 63, and is opposite to the first polarity surface of the first permanent magnet 61.

[0057] The magnetic field generated by the first permanent magnet 61 arranged on the side of the moving arc angle 4 in the area between the moving contact 1, the static contact 2, the arc isolation wall 3, the static arc angle 5 and the moving arc angle 4 has a first magnetic field component B1 parallel to the arc isolation wall 3, and the second permanent magnet 62 and the third permanent magnet 63 arranged on the side of the first arc isolation wall 31 and the second arc isolation wall 32, because the polarity of the first polarity plane of the second permanent magnet 62 and the first polarity plane of the third permanent magnet 63 are the same and opposite to the polarity of the first polarity plane of the first permanent magnet 61, therefore, the setting of the second permanent magnet 62 and the third permanent magnet 63 will strengthen the first magnetic field component B1 parallel to the arc isolation wall 3, and at the same time, it will also generate a second magnetic field component B2 close to the second permanent magnet 62 pointing to the third permanent magnet 63, and a third magnetic field component B3 close to the third permanent magnet 63 pointing to the second permanent magnet 62. For the arc generated by the separation of the moving and static contacts 2, if the direction of the arc current is from the moving contact 1 to the static contact 2, the arc will be deflected toward the second permanent magnet 62 under the action of the first magnetic field component B1, and then move along the surface of the first arc isolation wall 31 under the action of the second magnetic field component B2, and be effectively elongated and cooled under the action of the first side wall insulating grid group 311; if the direction of the arc current is from the static contact 2 to the moving contact 1, the arc will be deflected toward the third permanent magnet 63 under the action of the first magnetic field component B1, and then move along the surface of the second arc isolation wall 32 under the action of the third magnetic field component B3, and be effectively elongated and cooled under the action of the second side wall insulating grid group 321.

[0058] The moving contact 1 can move relative to the stationary contact 2 to achieve the closing and separation of the moving contact 1 and the stationary contact 2. One end of the stationary contact 2 overlaps and connects with one end of the stationary arc angle 5, one side of the moving arc angle 4 is arranged opposite to one side of the stationary arc angle 5, and an arc extinguishing chamber is formed between one side of the moving arc angle 4 and one side of the stationary arc angle 5. It also includes an arc extinguishing grid group, and the first side wall insulating grid group 311 and the second side wall insulating grid group 321 are arranged between the moving contact 1, the stationary contact 2 and the arc extinguishing chamber.

[0059] This embodiment also provides a DC circuit breaker having any one of the above double-side wall insulating grids and the above non-polarity arc extinguishing structure.

[0060] This embodiment uses a pair of side wall insulating grid groups relatively arranged on the arc isolation wall 3 in the circuit breaker to cooperate with an external magnetic field with the function of distinguishing the direction of the arc current, so that the insulating grid can fully exert the elongation and cooling effect of the arc, and is effective for DC arcs in two current directions. In addition, this solution has a small size, low cost and simple structure.

[0061] The above content is only for explaining the technical idea of ​​the utility model and cannot be used to limit the protection scope of the utility model. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the utility model shall fall within the protection scope of the claims of the utility model.

Claims

1. A double-sidewall insulating gate, characterized in that: It comprises a side wall insulating grid sheet group, the side wall insulating grid sheet group is composed of a plurality of insulating grid sheets, the insulating grid sheets are arranged perpendicular to the arc isolation wall (3) in the DC circuit breaker, and the insulating grid sheets are extended along the arc movement direction.

2. The double-sidewall insulated gate according to claim 1, characterized in that: The width of the insulating grid is less than half of the distance between the two arc isolation walls (3).

3. The double-sidewall insulated gate according to claim 1, characterized in that: The insulating grid is provided with a plurality of discontinuous intervals, and the discontinuous intervals are arranged along the length direction of the insulating grid.

4. The double-sidewall insulated gate according to claim 1, characterized in that: The plurality of insulating grid plates are continuously arranged to form a side wall insulating grid plate group.

5. The double-sidewall insulated gate according to claim 1, characterized in that: The insulating grid is in an arc shape.

6. The double-sidewall insulated gate according to claim 1, characterized in that: The two groups of side wall insulating grid sheet groups are respectively arranged on arc isolation walls (3) on both sides of a moving contact (1) and a stationary contact (2) in a DC circuit breaker.

7. A non-polarity arc extinguishing structure, characterized in that: It comprises a double-side wall insulating grid as claimed in any one of claims 1 to 6, a moving contact (1), a stationary contact (2), an arc isolation wall (3), a moving arc angle (4), a stationary arc angle (5) and a permanent magnet group (6); The moving contact (1) is connected to the moving arc angle (4) via a soft wire, and the stationary contact (2) is fixedly connected to the stationary arc angle (5); the arc isolation wall (3) is arranged on both sides of the moving contact (1) and the stationary contact (2); The arc isolation wall (3) comprises a first arc isolation wall (31) and a second arc isolation wall (32); the double side wall insulation grids comprise a first side wall insulation grid group (311) and a second side wall insulation grid group (321); the first side wall insulation grid group (311) and the second side wall insulation grid group (321) are respectively arranged on the first arc isolation wall (31) and the second arc isolation wall (32); The permanent magnet group (6) comprises a first permanent magnet (61), a second permanent magnet (62) and a third permanent magnet (63); The first permanent magnet (61) is arranged on a side of the moving arc angle (4) away from the moving contact (1) and the stationary contact (2); the second permanent magnet (62) is arranged on a side of the first arc isolation wall (31) away from the first side wall insulating grid sheet group (311); and the third permanent magnet (63) is arranged on a side of the second arc isolation wall (32) away from the second side wall insulating grid sheet group (321); The first polarity surface of the first permanent magnet (61) faces the moving arc angle (4); the first polarity surface of the second permanent magnet (62) is arranged opposite to the first polarity surface of the third permanent magnet (63), and the polarity of the first polarity surface of the second permanent magnet (62) is the same as the polarity of the first polarity surface of the third permanent magnet (63), and is opposite to the polarity of the first polarity surface of the first permanent magnet (61).

8. The non-polarity arc extinguishing structure according to claim 7, characterized in that: The moving contact (1) can move relative to the stationary contact (2) to achieve closing and separation of the moving contact (1) and the stationary contact (2).

9. The non-polarity arc extinguishing structure according to claim 7, characterized in that: One end of the static contact (2) overlaps and connects with one end of the static arc angle (5), one side of the dynamic arc angle (4) is arranged opposite to one side of the static arc angle (5), and an arc extinguishing chamber is formed between one side of the dynamic arc angle (4) and one side of the static arc angle (5).

10. A DC circuit breaker, characterized in that: It comprises the double-sidewall insulating grid as described in any one of claims 1 to 6 and the non-polarity arc extinguishing structure as described in any one of claims 7 to 9.

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