Double-breakpoint arc extinguishing structure with composite arc extinguishing chamber and circuit breaker

Abstract

The utility model provides a double-breakpoint arc extinguish structure with a composite arc extinguish chamber and a circuit breaker, and belongs to the technical field of low-voltage electric appliances, and the double-breakpoint arc extinguish structure is internally provided with a metal gate arc extinguish chamber and a double-insulation narrow slit arc extinguish chamber. The cutting effect of the metal gate on large-current arcs and the compressing and cooling effects of the insulating narrow slits on small current are fully combined, and meanwhile, the problems that the arc extinguish chamber of the metal gate is damaged by multiple times of ablation of the arcs under rated current and the effect that the large-current arcs enter the narrow slits is poor are solved. In order to drive bidirectional direct current to quickly enter the two arc extinguish chambers, a permanent magnet, a U-shaped magnetic conductive plate and a movable arc running channel are matched to generate a magnetic field force capable of driving bidirectional current arcs towards the arc extinguish chambers. The arc extinguish chamber integrates the advantages of a metal gate arc extinguish chamber and a double-insulation narrow-slit arc extinguish chamber, solves the problem that the service life of the metal gate is affected due to the fact that the metal gate is damaged after direct-current arcs are ablated for multiple times, and is simple in structure and easy to implement.

Description

Technical Field

[0001] The utility model belongs to the technical field of low-voltage electrical appliances, and in particular relates to a double-breakpoint arc-extinguishing structure with a composite arc-extinguishing chamber and a circuit breaker. Background Art

[0002] There are two natural zero-crossing points in each cycle of AC current. Most AC circuit breakers use the opportunity of current zero-crossing to break the arc. However, DC current has no natural zero-crossing point. When a low-voltage DC circuit breaker breaks a DC arc, it is usually necessary to increase the arc voltage to a sufficient level to force the DC current to decrease until it crosses zero, thereby extinguishing the arc.

[0003] Low-voltage circuit breakers usually use metal grid arc extinguishing chambers, which cut the arc into multiple short arcs in series through multiple metal grids, and use the near-pole voltage drop of the short arcs to increase the arc voltage. However, in the process of metal grid cutting the arc, the high-temperature arc will cause serious ablation of the metal grid. Multiple ablation may cause the metal grids to stick to each other or burn through, causing the grid to weaken the arc cutting effect or even fail. Utility Model Content

[0004] The utility model aims to overcome the problem that metal grids are damaged after repeated ablation of direct current arcs, and provides a double-breakpoint arc extinguishing structure and a circuit breaker with a composite arc extinguishing chamber.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A double-breakpoint arc extinguishing structure with a composite arc extinguishing chamber, comprising a composite arc extinguishing chamber, a contact group, an arc track group and a magnetic assembly; the composite arc extinguishing chamber comprises a metal grid arc extinguishing chamber and a double-insulated narrow-slit arc extinguishing chamber, the contact group comprises a static contact and a moving contact, the arc track group comprises a static arc track and a moving arc track, the static contact is fixedly connected to the static arc track at the same potential, the moving contact is fixedly connected to the moving arc track at the same potential, one end of the contact group is arranged between the metal grid arc extinguishing chamber and the double-insulated narrow-slit arc extinguishing chamber, and the other end of the contact group is fixedly connected to the moving arc track at the same potential. The composite arc extinguishing chamber is connected to one end of the arc track group, and the other end of the arc track group is connected to the magnetic assembly. The composite arc extinguishing chamber is arranged between the static arc track and the dynamic arc track. The magnetic assembly includes a permanent magnet, a magnetic conductive plate and an arc isolation wall. The permanent magnet is arranged between the arc isolation wall and the magnetic conductive plate. The magnetic conductive plate is a U-shaped structure. The first polarity surface of the permanent magnet is connected to the bottom of the U-shaped structure of the magnetic conductive plate; the second polarity surface of the permanent magnet is connected to a side of the arc track group away from the contact group, and the arc isolation wall covers the inside of the side wall of the U-shaped structure of the magnetic conductive plate.

[0007] Furthermore, the metal grid arc extinguishing chamber includes an insulating plate and a plurality of metal grids, the plurality of metal grids are arranged at intervals, and the two sides of the plurality of metal grids are fixedly connected to the insulating plate; the cross-section of the double-insulated narrow-slot arc extinguishing chamber along the axial direction of the arc is a mountain-shaped structure, the insulating narrow slot of the double-insulated narrow-slot arc extinguishing chamber is arranged at a concave position of the mountain-shaped structure, and the entrance width of the insulating narrow slot of the double-insulated narrow-slot arc extinguishing chamber is greater than the bottom width of the insulating narrow slot.

[0008] Furthermore, the double-insulated narrow-slot arc-extinguishing chamber has two groups of insulating narrow slots, and the insulating material of the double-insulated narrow-slot arc-extinguishing chamber is a high-temperature resistant insulating material, which includes polyformaldehyde, polyamide, polymethyl methacrylate or polytetrafluoroethylene.

[0009] Furthermore, an air outlet channel is provided at the bottom of the insulating slit.

[0010] Furthermore, the arc isolation wall is made of high temperature resistant insulating material, and the high temperature resistant insulating material includes polyoxymethylene, polyamide, polymethyl methacrylate or polytetrafluoroethylene.

[0011] Further, the contact group is provided with a first contact group and a second contact group; the arc track group is provided with a first arc track group and a second arc track group, the first contact group includes a first static contact and a first moving contact, the second contact group includes a second static contact and a second moving contact, the first arc track group includes a first moving arc track and a first static arc track, and the second arc track group includes a second moving arc track and a second static arc track;

[0012] The first static contact and the first moving contact are arranged opposite to each other, the first static contact is fixedly connected to the first static arc track with the same potential, the first moving contact is fixedly connected to the first moving arc track with the same potential, the second static contact and the second moving contact are fixedly connected to the second static arc track with the same potential, and the second moving contact is fixedly connected to the second moving arc track with the same potential.

[0013] Furthermore, the materials of the first moving arc track and the second moving arc track are conductive and magnetic metal materials.

[0014] Further, the magnetic assembly is provided with a first magnetic assembly and a second magnetic assembly; the first magnetic assembly includes a first permanent magnet, a first magnetic conductive plate and a first arc-isolating wall; the first magnetic conductive plate is mounted on the first moving arc track, and the first moving arc track is arranged inside the U-shaped structure of the first magnetic conductive plate; the first polarity surface of the first permanent magnet is connected to the bottom of the U-shaped structure of the first magnetic conductive plate, the second polarity surface of the first permanent magnet is connected to one side of the first moving arc track, and the first arc-isolating wall covers the inner side wall of the first magnetic conductive plate;

[0015] The second magnetic assembly includes a second permanent magnet, a second magnetic conductive plate and a second arc isolation wall; the second magnetic conductive plate is mounted on the second moving arc track, and the second moving arc track is arranged inside the U-shaped structure of the second magnetic conductive plate; the first polarity surface of the second permanent magnet is connected to the bottom of the U-shaped structure of the second magnetic conductive plate, the second polarity surface of the second permanent magnet is connected to one side of the second moving arc track, and the second arc isolation wall covers the inner side wall of the second magnetic conductive plate.

[0016] Furthermore, the first contact group, the first arc track group, and the first magnetic assembly are a first arc extinguishing structure; the second contact group, the second arc track group, and the second magnetic assembly are a second arc extinguishing structure; an insulating partition is arranged between the first arc extinguishing structure and the second arc extinguishing structure; the metal grid arc extinguishing chamber is arranged on one side of the first contact group, and the metal grid arc extinguishing chamber is fixedly installed between the first moving arc track and the first static arc track; the double-insulated narrow-slit arc extinguishing chamber is arranged on one side of the second contact group, and the double-insulated narrow-slit arc extinguishing chamber is installed between the second moving arc track and the second static arc track.

[0017] A circuit breaker with a composite arc extinguishing chamber is equipped with the above-mentioned double-breakpoint arc extinguishing structure with a composite arc extinguishing chamber.

[0018] The utility model also provides a circuit breaker, wherein the arc extinguishing chamber has any one of the double-breakpoint arc extinguishing structures described above.

[0019] Compared with the prior art, the utility model has at least the following beneficial effects:

[0020] The utility model provides a double-breakpoint arc-extinguishing structure with a composite arc-extinguishing chamber, in which a metal grid arc-extinguishing chamber and a double-insulated narrow-slit arc-extinguishing chamber are respectively arranged, which fully combines the cutting effect of the metal grid on the large current arc and the compression and cooling effect of the insulating narrow slit on the small current, and at the same time avoids the damage of the metal grid arc-extinguishing chamber to the arc multiple ablation under the rated current, and the problem of poor effect of large current arc entering the narrow slit. In order to drive both bidirectional direct current to quickly enter the two arc-extinguishing chambers, the utility model adopts a permanent magnet, a U-shaped magnetic conductive plate and a moving arc track to produce a magnetic field force that can drive both bidirectional current arcs toward the arc-extinguishing chamber.

[0021] The utility model provides a double-breakpoint arc-extinguishing structure with a composite arc-extinguishing chamber, which combines the advantages of a metal grid arc-extinguishing chamber and a double-insulated narrow-slit arc-extinguishing chamber, solves the problem that the metal grid is damaged after repeated ablation by a DC arc and affects its service life, and has a simple structure and is easy to implement. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present utility model. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0023] Figure 1 The utility model is an exploded view of a double-breakpoint arc-extinguishing structure with a composite arc-extinguishing chamber.

[0024] Figure 2 The utility model is a schematic assembly diagram of a double-breakpoint arc-extinguishing structure with a composite arc-extinguishing chamber.

[0025] Figure 3 It is an overall schematic diagram of a double-breakpoint arc-extinguishing structure with a composite arc-extinguishing chamber according to the utility model.

[0026] Figure 4 The utility model is a schematic diagram of a double-insulation narrow-slit arc-extinguishing chamber with a double-breakpoint arc-extinguishing structure having a composite arc-extinguishing chamber.

[0027] Figure 5 It is a schematic diagram of a metal grid arc extinguishing chamber with a double-breakpoint arc extinguishing structure having a composite arc extinguishing chamber according to the utility model.

[0028] Figure 6 It is a schematic diagram of a magnetic conductive plate with a double-breakpoint arc-extinguishing structure having a composite arc-extinguishing chamber according to the utility model.

[0029] Figure 7 Another schematic diagram of a magnetic conductive plate with a double-breakpoint arc-extinguishing structure having a composite arc-extinguishing chamber according to the utility model.

[0030] Figure 8 It is a schematic diagram of a first magnetic component of a double-breakpoint arc-extinguishing structure with a composite arc-extinguishing chamber according to the utility model.

[0031] Fig. 9 It is a schematic diagram of a second magnetic component of a double-breakpoint arc-extinguishing structure with a composite arc-extinguishing chamber according to the utility model;

[0032] Fig.10 The utility model is a schematic diagram of a first static contact of a first contact group of a double-breakpoint arc-extinguishing structure with a composite arc-extinguishing chamber.

[0033] Among them, 1 is a metal grid arc extinguishing chamber, 1-1 is a metal grid, 1-2 is an insulating plate, 2 is a double-insulated narrow gap arc extinguishing chamber, 2-1 is an insulating narrow gap, 2-2 is an air outlet channel, 3-1 is a first static contact, 3-2 is a second static contact, 4-1 is a first moving contact, 4-2 is a second moving contact, 5-1 is a first moving arc track, 5-2 is a second moving arc track, 6-1 is a first static arc track, 6-2 is a second static arc track, 7-1 is a first permanent magnet, 7-2 is a second permanent magnet, 8-1 is a first magnetic conductive plate, 8-2 is a second magnetic conductive plate, 9-1 is a first arc isolation wall, 9-2 is a second arc isolation wall, 10 is an insulating partition, 11 is a first magnetic assembly, and 12 is a second magnetic assembly. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to another component, or there may be several components at the same time. Unless otherwise defined, all technical and scientific terms used in this article have the same meaning as those generally understood by technicians in the technical field of the utility model. It should also be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a connection between the two components. For ordinary technicians in this field, the specific meanings of the above terms in the utility model can be understood according to specific circumstances. The terms used in the specification of the utility model herein are only for the purpose of describing specific embodiments and are not intended to limit the utility model.

[0035] It should also be noted that in the description of the present invention, the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0036] Example

[0037] See also Figure 1 , Figure 2 and Figure 3A double-breakpoint arc extinguishing structure with a composite arc extinguishing chamber comprises a composite arc extinguishing chamber, a contact group, an arc track group and a magnetic assembly; the composite arc extinguishing chamber comprises a metal grid arc extinguishing chamber 1 and a double-insulated narrow slot arc extinguishing chamber 2, the contact group comprises a static contact and a moving contact, the arc track group comprises a static arc track and a moving arc track, the static contact is fixedly connected to the static arc track at the same potential, the moving contact is fixedly connected to the moving arc track at the same potential, one end of the contact group is arranged between the metal grid arc extinguishing chamber 1 and the double-insulated narrow slot arc extinguishing chamber 2, the other end of the contact group is connected to one end of the arc track group, the other end of the arc track group is connected to the magnetic assembly, the composite arc extinguishing chamber is arranged between the static arc track and the moving arc track, the magnetic assembly comprises a permanent magnet, a magnetic conductive plate and an arc isolation wall, the permanent magnet is arranged between the arc isolation wall and the magnetic conductive plate, see Figure 6 and Figure 7 The magnetic conductive plate is a U-shaped structure, the first polarity surface of the permanent magnet is connected to the bottom of the U-shaped structure of the magnetic conductive plate; the second polarity surface of the permanent magnet is connected to the side of the arc track group away from the contact group, and the arc isolation wall covers the inside of the side wall of the U-shaped structure of the magnetic conductive plate.

[0038] Optional, see Figure 5 The metal grid arc extinguishing chamber 1 comprises an insulating plate 1-2 and a plurality of metal grids 1-1, wherein the plurality of metal grids 1-1 are arranged at intervals, and both sides of the plurality of metal grids 1-1 are fixedly connected to the insulating plate 1-2; see Figure 4 The cross-section of the double-insulated narrow-slot arc-extinguishing chamber 2 along the axial direction of the arc is a mountain-shaped structure, the insulating narrow slot 2-1 of the double-insulated narrow-slot arc-extinguishing chamber 2 is set at a concave position of the mountain-shaped structure, and the entrance width of the insulating narrow slot 2-1 of the double-insulated narrow-slot arc-extinguishing chamber 2 is greater than the bottom width of the insulating narrow slot 2-1.

[0039] Optionally, two groups of insulating narrow slots 2-1 of the double-insulated narrow slot arc extinguishing chamber 2 are provided, and the insulating material of the double-insulated narrow slot arc extinguishing chamber 2 is a high-temperature resistant insulating material, and the high-temperature resistant insulating material includes polyformaldehyde, polyamide, polymethyl methacrylate or polytetrafluoroethylene.

[0040] Optionally, an air outlet channel 2-2 is provided at the bottom of the insulating slit 2-1.

[0041] Optionally, the arc isolation wall is made of a high temperature resistant insulating material, and the high temperature resistant insulating material includes polyoxymethylene, polyamide, polymethyl methacrylate or polytetrafluoroethylene.

[0042] Optionally, the contact group is provided with a first contact group and a second contact group; the arc track group is provided with a first arc track group and a second arc track group, and the first contact group includes a first static contact 3-1 and a first moving contact 4-1, see Fig.10 , is a detailed schematic diagram of the first stationary contact 3-1, the second contact group includes a second stationary contact 3-2 and a second moving contact 4-2,

[0043] The first running arc track group includes a first dynamic running arc track 5-1 and a first static running arc track 6-1, and the second running arc track group includes a second dynamic running arc track 5-2 and a second static running arc track 6-2;

[0044] The first static contact 3-1 and the first moving contact 4-1 are arranged opposite to each other, and the first static contact 3-1 performs separation and closing actions relative to the first moving contact 4-1, the first static contact 3-1 and the first static arc track 6-1 are fixedly connected at the same potential, and the first moving contact 4-1 and the first moving arc track 5-1 are fixedly connected at the same potential, the second static contact 3-2 and the second moving contact 4-2 are arranged opposite to each other, and the second static contact 3-2 performs separation and closing actions relative to the second moving contact 4-2, the second static contact 3-2 and the second static arc track 6-2 are fixedly connected at the same potential, and the second moving contact 4-2 and the second moving arc track 5-2 are fixedly connected at the same potential.

[0045] Optionally, the materials of the first moving arc track 5-1 and the second moving arc track 5-2 are conductive and magnetic metal materials.

[0046] Optionally, the magnetic assembly includes a first magnetic assembly 11 and a second magnetic assembly 12; see Figure 8 The first magnetic assembly 11 includes a first permanent magnet 7-1, a first magnetic conductive plate 8-1 and a first arc-isolating wall 9-1; the first magnetic conductive plate 8-1 is mounted on the first moving arc track 5-1, and the first moving arc track 5-1 is arranged inside the U-shaped structure of the first magnetic conductive plate 8-1; the first polarity surface of the first permanent magnet 7-1 is connected to the bottom of the U-shaped structure of the first magnetic conductive plate 8-1, and the second polarity surface of the first permanent magnet 7-1 is connected to one side of the first moving arc track 5-1, and the first arc-isolating wall 9-1 covers the inner side wall of the first magnetic conductive plate 8-1 to separate the first magnetic conductive plate 8-1 from the arc;

[0047] See also Fig. 9 The second magnetic assembly 12 includes a second permanent magnet 7-2, a second magnetic conductive plate 8-2 and a second arc isolation wall 9-2; the second magnetic conductive plate 8-2 is mounted on the second moving arc track 5-2, and the second moving arc track 5-2 is arranged inside the U-shaped structure of the second magnetic conductive plate 8-2; the first polarity surface of the second permanent magnet 7-2 is connected to the bottom of the U-shaped structure of the second magnetic conductive plate 8-2, and the second polarity surface of the second permanent magnet 7-2 is connected to one side of the second moving arc track 5-2, and the second arc isolation wall 9-2 covers the inner side wall of the second magnetic conductive plate 8-2 to separate the second magnetic conductive plate 8-2 from the arc.

[0048] Optional, see Figure 1The first contact group, the first arc track group, and the first magnetic assembly are the first arc extinguishing structure; the second contact group, the second arc track group, and the second magnetic assembly are the second arc extinguishing structure; an insulating partition 10 is arranged between the first arc extinguishing structure and the second arc extinguishing structure; a metal grid arc extinguishing chamber 1 is arranged on one side of the first contact group; the metal grid arc extinguishing chamber 1 is fixedly installed between the first moving arc track 5-1 and the first static arc track 6-1; a double-insulated narrow-slit arc extinguishing chamber 2 is arranged on one side of the second contact group; and the double-insulated narrow-slit arc extinguishing chamber 2 is installed between the second moving arc track 5-2 and the second static arc track 6-2.

[0049] A circuit breaker with a composite arc extinguishing chamber is equipped with any one of the above double-breakpoint arc extinguishing structures with a composite arc extinguishing chamber.

[0050] 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-breakpoint arc-extinguishing structure with a composite arc-extinguishing chamber, characterized in that: The invention comprises a composite arc extinguishing chamber, a contact group, an arc track group and a magnetic assembly; the composite arc extinguishing chamber comprises a metal grid arc extinguishing chamber (1) and a double-insulated narrow-slit arc extinguishing chamber (2); the contact group comprises a static contact and a moving contact; the arc track group comprises a static arc track and a moving arc track; the static contact is fixedly connected to the static arc track at the same potential; the moving contact is fixedly connected to the moving arc track at the same potential; one end of the contact group is arranged between the metal grid arc extinguishing chamber (1) and the double-insulated narrow-slit arc extinguishing chamber (2); the other end of the contact group is connected to the arc track; One end of the running arc track group is connected, the other end of the running arc track group is connected to the magnetic assembly, the composite arc extinguishing chamber is arranged between the static running arc track and the dynamic running arc track, the magnetic assembly comprises a permanent magnet, a magnetic conductive plate and an arc isolation wall, the permanent magnet is arranged between the arc isolation wall and the magnetic conductive plate, the magnetic conductive plate is a U-shaped structure, the first polarity surface of the permanent magnet is connected to the bottom of the U-shaped structure of the magnetic conductive plate; the second polarity surface of the permanent magnet is connected to a side of the running arc track group away from the contact group, and the arc isolation wall covers the inside of the side wall of the U-shaped structure of the magnetic conductive plate.

2. A double-breakpoint arc-extinguishing structure with a composite arc-extinguishing chamber according to claim 1, characterized in that: The metal grid arc extinguishing chamber (1) comprises an insulating plate (1-2) and a plurality of metal grids (1-1), the plurality of metal grids (1-1) being arranged at intervals, and the two sides of the plurality of metal grids (1-1) being fixedly connected to the insulating plate (1-2); the cross section of the double-insulated narrow-slit arc extinguishing chamber (2) along the axial direction of the electric arc is a chevron-shaped structure, the insulating slit (2-1) of the double-insulated narrow-slit arc extinguishing chamber (2) is arranged at a concave position of the chevron-shaped structure, and the inlet width of the insulating slit (2-1) of the double-insulated narrow-slit arc extinguishing chamber (2) is greater than the bottom width of the insulating slit (2-1).

3. The double-breakpoint arc-extinguishing structure with a composite arc-extinguishing chamber according to claim 1, characterized in that: The double-insulated narrow-slot arc extinguishing chamber (2) is provided with two groups of insulating narrow slots (2-1); the insulating material of the double-insulated narrow-slot arc extinguishing chamber (2) is a high-temperature resistant insulating material, and the high-temperature resistant insulating material includes polyoxymethylene, polyamide, polymethyl methacrylate or polytetrafluoroethylene.

4. A double-breakpoint arc-extinguishing structure with a composite arc-extinguishing chamber according to claim 1, characterized in that: An air outlet channel (2-2) is provided at the bottom of the insulating narrow slit (2-1).

5. The double-breakpoint arc-extinguishing structure with a composite arc-extinguishing chamber according to claim 1, characterized in that: The arc isolation wall is made of high temperature resistant insulating material, and the high temperature resistant insulating material includes polyoxymethylene, polyamide, polymethyl methacrylate or polytetrafluoroethylene.

6. A double-breakpoint arc-extinguishing structure with a composite arc-extinguishing chamber according to claim 1, characterized in that: The contact group is provided with a first contact group and a second contact group; the arc track group is provided with a first arc track group and a second arc track group, the first contact group includes a first static contact (3-1) and a first moving contact (4-1), the second contact group includes a second static contact (3-2) and a second moving contact (4-2), the first arc track group includes a first moving arc track (5-1) and a first static arc track (6-1), and the second arc track group includes a second moving arc track (5-2) and a second static arc track (6-2); The first static contact (3-1) and the first moving contact (4-1) are arranged opposite to each other, the first static contact (3-1) and the first static arc track (6-1) are fixedly connected at the same potential, the first moving contact (4-1) and the first moving arc track (5-1) are fixedly connected at the same potential, the second static contact (3-2) and the second moving contact (4-2) are arranged opposite to each other, the second static contact (3-2) and the second static arc track (6-2) are fixedly connected at the same potential, and the second moving contact (4-2) and the second moving arc track (5-2) are fixedly connected at the same potential.

7. A double-breakpoint arc-extinguishing structure with a composite arc-extinguishing chamber according to claim 6, characterized in that: The materials of the first moving arc track (5-1) and the second moving arc track (5-2) are conductive and magnetic metal materials.

8. A double-breakpoint arc-extinguishing structure with a composite arc-extinguishing chamber according to claim 6, characterized in that: The magnetic assembly is provided with a first magnetic assembly (11) and a second magnetic assembly (12); the first magnetic assembly (11) comprises a first permanent magnet (7-1), a first magnetic conductive plate (8-1) and a first arc-isolating wall (9-1); the first magnetic conductive plate (8-1) is mounted on the first moving arc track (5-1), and the first moving arc track (5-1) is arranged inside the U-shaped structure of the first magnetic conductive plate (8-1); the first polarity surface of the first permanent magnet (7-1) is connected to the bottom of the U-shaped structure of the first magnetic conductive plate (8-1), the second polarity surface of the first permanent magnet (7-1) is connected to one side of the first moving arc track (5-1), and the first arc-isolating wall (9-1) covers the inner side wall of the first magnetic conductive plate (8-1); The second magnetic assembly (12) comprises a second permanent magnet (7-2), a second magnetic conductive plate (8-2) and a second arc-isolating wall (9-2); the second magnetic conductive plate (8-2) is mounted on the second moving arc track (5-2), and the second moving arc track (5-2) is arranged inside the U-shaped structure of the second magnetic conductive plate (8-2); the first polarity surface of the second permanent magnet (7-2) is connected to the bottom of the U-shaped structure of the second magnetic conductive plate (8-2), the second polarity surface of the second permanent magnet (7-2) is connected to one side of the second moving arc track (5-2), and the second arc-isolating wall (9-2) covers the inner side wall of the second magnetic conductive plate (8-2).

9. A double-breakpoint arc-extinguishing structure with a composite arc-extinguishing chamber according to claim 7, characterized in that: The first contact group, the first arc track group and the first magnetic assembly form a first arc extinguishing structure; the second contact group, the second arc track group and the second magnetic assembly form a second arc extinguishing structure; an insulating partition (10) is arranged between the first arc extinguishing structure and the second arc extinguishing structure; the metal grid arc extinguishing chamber (1) is arranged on one side of the first contact group; the metal grid arc extinguishing chamber (1) is fixedly installed between a first moving arc track (5-1) and a first static arc track (6-1); the double-insulated narrow-slit arc extinguishing chamber (2) is arranged on one side of the second contact group; the double-insulated narrow-slit arc extinguishing chamber (2) is installed between a second moving arc track (5-2) and a second static arc track (6-2).

10. A circuit breaker with a composite arc extinguishing chamber, characterized in that: The invention is equipped with a double-breakpoint arc-extinguishing structure with a composite arc-extinguishing chamber as described in any one of claims 1 to 9.

Images