An arc quenching system and circuit breaker

Abstract

The application relates to the technical field of low-voltage electrical apparatus, in particular to an arc extinguishing system and a circuit breaker. The arc extinguishing system comprises a moving contact, a static contact and an arc extinguishing chamber. The moving contact can rotate around an axis of rotation to contact or separate from the static contact. A reference line is drawn through the contact points of the moving contact and the static contact when the two are separated. The arc extinguishing chamber is arranged on the side of the reference line away from the axis of rotation. The arc extinguishing chamber comprises a magnetic field generating component, the magnetic field generating component comprises a first part and a second part with opposite magnetic poles. In the cross section of the magnetic field generating component perpendicular to the reference line, the cross section of the second part is annularly arranged on the cross section of the first part, and the end of the cross section of the second part away from the reference line has an opening. The arc extinguishing system provided by the application can realize non-polarity arc extinguishing, can greatly lengthen the electric arc compared with the traditional scheme, and can improve the performance of the arc extinguishing system. In addition, the first part and the second part adopt an inner-outer nesting design scheme, so that the structure of the arc extinguishing system is more compact, and the occupied space of the arc extinguishing system is reduced.

Description

Technical Field

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

[0002] In the current low-voltage electrical appliance field, DC voltage can only reach DC 1500V. Specifically, in circuit breaker switches, current new products can only reach single-pole DC 750V and double-pole DC 1500V; none of the products currently on the market can reach DC 2500V. According to the latest low-voltage electrical appliance industry standard development plan, it will develop to AC 2000V and DC 3000V. There is already customer demand for low-voltage electrical appliances with DC 2000-2500V, and existing DC 1500V products can no longer meet customer needs, urgently requiring replacement. The arc-extinguishing system of a circuit breaker is used to extinguish the arc generated by the separation of the moving and stationary contacts, and it directly affects the rated operating voltage of the circuit breaker.

[0003] To improve circuit breaker performance, existing circuit breakers often employ permanent magnets to elongate the arc and enhance arc extinguishing efficiency. Current magnetic blowout arc extinguishing methods typically involve applying permanent magnets of opposite polarity to both sides of the discharge structure formed by the separation of the moving and stationary contacts. This creates a magnetic field between the two magnets, pulling the arc generated by the separation of the moving and stationary contacts away from them under the influence of the magnetic field. However, this method has certain configuration requirements regarding the direction of the arc current and cannot achieve a non-polarity condition.

[0004] In response, some non-polar magnetic blowout arc extinguishing systems have emerged on the market. For example, patent number CN202110617522.6 proposes a breaking device in which a permanent magnet is disposed on the side of the arc-extinguishing grid assembly facing away from the moving contact, used to generate a magnetic force that causes the arc to enter the arc-extinguishing grid assembly. Because the permanent magnet is disposed on the side of the arc-extinguishing grid assembly facing away from the moving contact, the magnetic field force generated between the moving and stationary contacts is not strong, thus offering limited improvement to circuit breaker performance. Furthermore, the arc extension length in this solution is relatively short, which is detrimental to arc cooling. In addition, the above solution has a complex structure and occupies a large space, hindering the miniaturization of circuit breakers. Summary of the Invention

[0005] One object of the present invention is to provide a non-polar arc extinguishing system with a compact structure and good arc extinguishing performance.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] An arc-extinguishing system includes a moving contact, a stationary contact, and an arc-extinguishing chamber. The moving contact is rotatable about a rotation axis to contact or separate from the stationary contact. When the moving contact and the stationary contact are separated, the line connecting their contact points is a reference line, and the arc-extinguishing chamber is located on the side of the reference line away from the rotation axis.

[0008] The arc-extinguishing chamber includes a magnetic field generating component, which includes a first part and a second part with opposite magnetic poles; in a cross section of the magnetic field generating component perpendicular to the reference line, the cross section of the second part is arranged around the cross section of the first part, and the cross section of the second part is open at one end away from the reference line.

[0009] Furthermore, the magnetic field generating component is a magnetic component or a permanent magnet.

[0010] Furthermore, the cross-section of the magnetic field generating component is U-shaped, C-shaped, C-shaped, or <-shaped.

[0011] Furthermore, the first part includes a plurality of first magnetic splicing components;

[0012] And / or, the second part includes a plurality of second magnetic splicing elements.

[0013] Furthermore, the arc-extinguishing chamber includes an isolation shell, and the magnetic field generating component is enclosed within the isolation shell.

[0014] Furthermore, one or more protrusions are respectively provided on the two outer wall surfaces of the isolation housing located on both sides of the reference line;

[0015] Alternatively, the arc extinguishing system may further include two sets of grid plates, each set of grid plates being disposed on two outer wall surfaces on either side of the reference line on the isolation housing; each grid plate set includes a plurality of grid plates arranged sequentially along the extension direction of the reference line.

[0016] Furthermore, the isolation shell includes a cylindrical body and two end plates respectively disposed at both ends of the cylindrical body;

[0017] The magnetic field generating component is disposed within the enclosed space formed by the cylinder and the end plate.

[0018] Furthermore, the isolation shell is made of a gas-generating material;

[0019] Alternatively, the cylinder may be made of a gas-generating material;

[0020] Alternatively, a gas-generating material may be provided on the outer wall surface of the isolation shell.

[0021] Furthermore, it also includes a rotating shaft and a movable arc-inducing plate; the movable contact can rotate around the axis of the rotating shaft, and the two ends of the movable arc-inducing plate are respectively connected to the arc-extinguishing chamber and the outer peripheral surface of the rotating shaft;

[0022] And / or, it also includes a stationary arc-drawing plate, the two ends of which are respectively connected to the stationary contact and the arc-extinguishing chamber.

[0023] Furthermore, a mounting ring is provided at one end of the movable arc plate near the rotating shaft; the mounting ring is a circular ring structure or a semi-circular ring structure, and the mounting ring is arranged around the periphery of the rotating shaft.

[0024] Another object of the present invention is a circuit breaker comprising the arc extinguishing system described in any of the above embodiments.

[0025] The beneficial effects of this invention are:

[0026] This invention provides an arc-extinguishing system and a circuit breaker incorporating the arc-extinguishing system. The arc-extinguishing system includes a moving contact, a stationary contact, and an arc-extinguishing chamber. The moving contact is rotatable about a rotation axis to contact or separate from the stationary contact. Using the line connecting the contact points of the moving and stationary contacts when they separate as a reference line, the arc-extinguishing chamber is located on the side of the reference line away from the rotation axis. The arc-extinguishing chamber includes a magnetic field generating component, comprising a first part and a second part with opposite magnetic poles. In a cross-section of the magnetic field generating component perpendicular to the reference line, the cross-section of the second part is arranged around the cross-section of the first part, and the end of the second part's cross-section away from the reference line has an opening. The arc-extinguishing system provided by this application can achieve non-polar arc extinguishing, and the middle of the arc can move along both sides of the magnetic field generating component to the open end of the second part. Compared with traditional solutions, this significantly lengthens the arc and improves the performance of the arc-extinguishing system. Furthermore, the nested design of the first and second parts makes the arc-extinguishing system structure more compact, reducing the space occupied by the arc-extinguishing system. Attached Figure Description

[0027] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the arc extinguishing system provided in an embodiment of the present invention;

[0029] Figure 2 A diagram illustrating the left-hand rule;

[0030] Figure 3A schematic diagram of the magnetic field, current, and Ampere force on the current generated by the magnetic field generating component provided in an embodiment of the present invention;

[0031] Figure 4 This is a schematic diagram illustrating the movement of the electric arc during the arc extinguishing process in the arc extinguishing system provided in an embodiment of the present invention.

[0032] Figure 5 A schematic cross-sectional view of a magnetic field generating component provided in one embodiment of the present invention;

[0033] Figure 6 A schematic cross-sectional view of a magnetic field generating component provided in one embodiment of the present invention;

[0034] Figure 7 A schematic cross-sectional view of a magnetic field generating component provided in one embodiment of the present invention;

[0035] Figure 8 A schematic cross-sectional view of a magnetic field generating component provided in one embodiment of the present invention;

[0036] Figure 9 A schematic cross-sectional view of a magnetic field generating component provided in one embodiment of the present invention;

[0037] Figure 10 This is a schematic diagram of the structure of an isolation housing provided in one embodiment of the present invention;

[0038] Figure 11 A schematic diagram of the structure of the isolation housing provided in another embodiment of the present invention;

[0039] Figure 12 This is a schematic diagram of the internal structure of a circuit breaker at one angle, provided in an embodiment of the present invention.

[0040] Figure 13 This is a schematic diagram of the internal structure of a circuit breaker provided in an embodiment of the present invention from another angle.

[0041] icon:

[0042] 1-Moving contact;

[0043] 2-Stationary contact;

[0044] 3-Arc-extinguishing chamber; 31-Magnetic field generating component; 311-First part; 312-Second part; 32-Isolation shell; 321-Cylinder; 3211-Protruding strip; 3212-Arc-shaped surface; 322-End plate;

[0045] 4-Spindle; 41-Mounting boss;

[0046] 5-Moving arc-drawing plate; 51-Mounting ring;

[0047] 6-Static Arc-drawing Plate;

[0048] 7-Grid group;

[0049] 10-Reference Line;

[0050] 20 - Housing; 201 - Card slot. Detailed Implementation

[0051] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0052] It should be noted that in the description of this invention, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0053] It should be noted that in the description of this invention, the terms "connection" and "installation" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or a connection through an intermediate medium; they can refer to a mechanical connection or an electrical connection. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0054] One embodiment of the present invention provides an arc extinguishing system, referring to... Figure 1 The arc-extinguishing system includes a moving contact 1, a stationary contact 2, and an arc-extinguishing chamber 3. The moving contact 1 can rotate around a rotation axis to contact or separate from the stationary contact 2. A reference line 10 is used as the line connecting the contact points of the moving contact 1 and the stationary contact 2 when they are separated. In this embodiment, the arc-extinguishing chamber 3 is located on the side of the reference line 10 away from the rotation axis. The arc-extinguishing chamber 3 includes a magnetic field generating component 31, which includes a first part 311 and a second part 312 with opposite magnetic poles. In a cross-section of the magnetic field generating component 31 perpendicular to the reference line 10, the cross-section of the second part 312 is arranged around the cross-section of the first part 311, and the end of the cross-section of the second part 312 away from the reference line 10 has an opening. The cross-section of the magnetic field generating component 31 perpendicular to the reference line 10 is referred to as the cross-section of the magnetic field generating component 31.

[0055] The arc extinguishing principle of the above-mentioned arc extinguishing system is as follows:

[0056] Reference Figure 2 According to the left-hand rule: extend your left hand so that your thumb is perpendicular to the other four fingers and all are in the same plane as your palm; let the magnetic field line B enter from the palm and point your four fingers in the direction of the current I. At this time, the direction pointed by your thumb is the direction of the Ampere force F on the current-carrying conductor in the magnetic field.

[0057] Reference Figure 3 and Figure 4 , Figure 4 The dashed lines in the diagram represent electric arcs. Because the first part 311 and the second part 312 are nested and have opposite magnetic poles, the magnetic field generating component 31 generates a magnetic field with magnetic field lines pointing from the first part 311 to the second part 312 or from the second part 312 to the first part 311. These magnetic field lines diverge along the outer contour of the second part 312 towards its periphery. Taking the first part 311 as the S pole and the second part as the N pole as an example, the magnetic field lines inside the magnetic field generating component 31 then point from the first part 311 to the second part 312. When the moving contact 1 and the stationary contact 2 separate, the direction of the current I1 generating the arc is perpendicular to the plane of the paper and inwards. Under the action of the Ampere force F1, the arc propels the center of the arc from... Figure 3 The left side of the magnetic field generating component 31 is pulled to the open end of the second part 312; when the moving contact 1 and the stationary contact 2 separate and the direction of the arc current I2 is perpendicular to the paper and outwards, the arc, under the action of the Ampere force F2, moves the middle part of the arc from... Figure 3 The right side of the medium magnetic field generating component 31 is pulled to the opening end of the second part 312.

[0058] Based on the above principles, the arc extinguishing system provided in this application can achieve non-polar arc extinguishing, and the middle part of the arc can move along both sides of the magnetic field generating member 31 to the opening end of the second part 312 (i.e., away from the reference line 10). Compared with the traditional solution, the arc can be lengthened significantly, improving the performance of the arc extinguishing system. In addition, the nested design of the first part 311 and the second part 312 makes the arc extinguishing system structure more compact and reduces the space occupied by the arc extinguishing system.

[0059] Optionally, the magnetic field generating component 31 is a magnetic component or a permanent magnet, preferably a permanent magnet.

[0060] The magnetic field generating component 31 can be configured in various ways; for example, refer to Figure 5 and Figure 6 The cross-section of the magnetic field generating component 31 is U-shaped, C-shaped, C-shaped, or <-shaped; refer to Figure 7 and Figure 8 The magnetic field generating component 31 can also be configured such that the first part 311 is a solid structure, and the second part 312 is partially enclosed around the outer periphery of the first part 311; the magnetic field generating component 31 can also be assembled from multiple parts, as shown in the figure. Figure 9The first part 311 includes a plurality of first magnetic splicing elements; and / or, the second part 312 includes a plurality of second magnetic splicing elements; furthermore, the second part 312 may also be configured as a shell structure with an opening, wherein the first part 311 is disposed within the shell. It is understood that the structure of the magnetic field generating member 31 is not limited to the above examples.

[0061] Reference Figure 10 The arc-extinguishing chamber 3 includes an isolation shell 32, within which the magnetic field generating component 31 is enclosed. Specifically, the isolation shell 32 includes a cylindrical body 321 open at both ends and two end plates 322 respectively disposed at both ends of the cylindrical body 321. The magnetic field generating component 31 is disposed within the enclosed space formed by the cylindrical body 321 and the end plates 322. At least one end plate is closable at the opening of the cylindrical body 321. The functions of the above-mentioned arrangement are: to isolate the magnetic field generating component 31, preventing interference between the magnetic field generating component 31 and other electronic structures; to fix and protect the magnetic field generating component 31; and to reduce the space occupied by the arc-extinguishing chamber 3.

[0062] Furthermore, one or more protrusions 3211 are respectively provided on the two outer wall surfaces of the isolation housing 32, which are respectively located on both sides of the reference line 10; in this embodiment, the protrusions 3211 are specifically provided on the cylinder 321. (Refer to...) Figure 10 , Figure 10 The dashed line in the figure represents the electric arc; the length of the electric arc can be further stretched by the convex strip 3211 to improve the arc extinguishing performance of the arc extinguishing system.

[0063] Reference Figure 11 In other embodiments, the arc extinguishing system further includes a grid structure comprising two sets of grid groups 7, each set of grid groups 7 being disposed on two outer wall surfaces of the isolation housing 32, respectively, located on both sides of the reference line 10. Each grid group 7 includes a plurality of grids arranged sequentially along the extension direction of the reference line 10. In this embodiment, the electric arc generated during power failure is stretched towards both sides of the isolation housing 32 under the action of a magnetic field and enters the grid groups 7 located on both sides of the isolation housing 32. The grids cut the arc, achieving a rapid arc extinguishing effect. After entering the grid groups 7, the arc continues to penetrate deeper into the grid groups 7 under the action of a magnetic field, enhancing the cutting effect of the grids.

[0064] In this embodiment, the inner contour of the isolation housing 32 is adapted to the outer contour of the magnetic field generating component 31 so that the magnetic field generating component 31 can be fixed inside the isolation housing 32 and the magnetic field generating component 31 can be prevented from shaking.

[0065] In this embodiment, an arc-shaped surface 3212 is provided on the side of the cylinder 321 near the reference line 10, and the two walls of the arc-shaped surface 3212 extend in a direction away from the reference line 10; the above arrangement facilitates the movement of the electric arc along the top of the arc-shaped surface toward the two walls of the arc-shaped surface.

[0066] Optionally, the isolation housing 32 is made of a gas-generating material;

[0067] Alternatively, the cylinder 321 may be made of a gas-generating material;

[0068] Alternatively, a gas-generating material may be provided on the outer wall surface of the isolation housing 32.

[0069] In this application, the electric arc is stretched along the outer wall of the isolation shell 32, and the gas generated by the gas-generating material can quickly cool the electric arc. On the one hand, this can improve the arc extinguishing efficiency, and on the other hand, it can prevent the heat generated by the electric arc from affecting the magnetism of the magnetic field generating component 31. Since the electric arc is further stretched under the obstruction of the protrusion 3211, the contact length with the gas-generating material can be increased, further improving the speed of cooling the electric arc.

[0070] Reference Figure 12 The arc extinguishing system also includes a rotating shaft 4 and a moving arc-inducing plate 5; the moving contact 1 can rotate around the axis of the rotating shaft 4, and the two ends of the moving arc-inducing plate 5 are respectively connected to the outer circumferential surface of the arc extinguishing chamber 3 and the rotating shaft 4;

[0071] And / or, it also includes a stationary arc-drawing piece 6, the two ends of which are connected to the stationary contact 2 and the arc-extinguishing chamber 3, respectively.

[0072] Reference Figure 13 A mounting ring 51 is provided at one end of the movable arc-guiding piece 5 near the rotating shaft 4. The mounting ring 51 is a circular or semi-circular structure and is arranged around the periphery of the rotating shaft 4. In this embodiment, mounting bosses 41 are provided on both opposite end faces of the rotating shaft 4. The outer contour of the cross-section of the mounting bosses 41 is circular. A mounting ring 51 is provided on each side of the movable arc-guiding piece 5. The two mounting rings 51 are respectively arranged around the periphery of the mounting bosses 41 at both ends of the rotating shaft 4. The inner ring surface of the mounting ring 51 and the outer ring surface of the mounting bosses 41 are rotatably engaged. In the above structure, the mounting bosses 41 limit the movable arc-guiding piece 5 through the mounting rings 51, restricting one end of the movable arc-guiding piece 5 to the rotating shaft 4, and the rotation of the rotating shaft 4 will not affect the movable arc-guiding piece 5. The other end of the movable arc-guiding piece 5 can be connected to the end plate 322 near the movable contact 1 by fasteners. The belly of the moving arc plate 5 is bent to form a groove, and the moving contact 1, when separated from the stationary contact 2, has its end away from the rotating shaft 4 extending into the groove.

[0073] Continue to refer to Figure 13 One end of the stationary arc-drawing piece 6 is connected to the stationary contact 2, and the other end of the stationary arc-drawing piece 6 can be connected to the end plate 322 near the stationary contact 2 by fasteners.

[0074] Analyzing the above structure, the two end plates 322 of the isolation housing 32 are respectively connected to the moving arc-inducing plate 5 and the stationary arc-inducing plate 6. On the one hand, this ensures that the arc is guided to the cylinder 321, and on the other hand, it fixes the arc-extinguishing chamber 3. Compared with the solution of directly fixing the arc-extinguishing chamber 3 to the circuit breaker housing, in this embodiment, the two ends of the arc-extinguishing chamber 3 are fixed to the moving and stationary contacts respectively through the moving and stationary arc-inducing plates, so that the arc-extinguishing system forms a whole. This makes it easier to align the arc-extinguishing chamber 3 with the reference line 10, and also simplifies the system structure and facilitates product assembly and disassembly.

[0075] Another embodiment of the present invention provides a circuit breaker, referring to Figure 12 and Figure 13 The circuit breaker includes the arc extinguishing system in any of the above embodiments; the circuit breaker has the technical effects of any of the above embodiments, which will not be repeated here.

[0076] The circuit breaker provided in this application also includes a housing 20, and the arc extinguishing system is disposed inside the housing 20; a slot 201 is provided on each of the two opposite inner wall surfaces of the housing 20, and the opposite sides of the arc extinguishing chamber 3 are respectively locked in the two slots 201; the rotating shaft 4 is rotatably connected inside the housing 20, and the position of the arc extinguishing system inside the housing 20 is restricted by the arc extinguishing chamber 3 and the rotating shaft 4.

[0077] The circuit breaker can be equipped with one or more arc extinguishing systems according to the usage requirements and product specifications; when the circuit breaker has multiple arc extinguishing systems, the multiple arc extinguishing systems can be arranged sequentially along the axial direction of the rotation axis of the moving contact 1, or they can be distributed circumferentially along the rotation axis of the moving contact 1.

[0078] In this embodiment, the circuit breaker includes two arc-extinguishing systems respectively disposed on both sides of the rotating shaft 4. In this embodiment, the mounting rings 51 on the moving arc-starting plates 5 of the two arc-extinguishing systems are both semi-circular ring structures. The mounting rings 51 of the two arc-extinguishing systems located at the same end of the rotating shaft 4 form a complete circular ring structure, and the circular ring structure is fitted onto the mounting boss 41. Optionally, the two mounting rings 51 forming a complete circular ring structure are integrally formed, so that the two moving arc-starting plates 5 form a whole.

[0079] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An arc-extinguishing system comprising a moving contact (1), a stationary contact (2), and an arc-extinguishing chamber (3), wherein the moving contact (1) is rotatable about a rotation axis to contact or separate from the stationary contact (2); characterized in that, When the moving contact (1) and the stationary contact (2) are separated, the line connecting their contact points is the reference line (10), and the arc-extinguishing chamber (3) is located on the side of the reference line (10) away from the axis of rotation; The arc-extinguishing chamber (3) includes a magnetic field generating component (31), which includes a first part (311) and a second part (312) with opposite magnetic poles. The magnetic field generating component (31) is perpendicular to the cross section of the reference line (10), and the cross section of the second part (312) is arranged around the cross section of the first part (311), and the cross section of the second part (312) has an opening at one end away from the reference line (10). The magnetic field generating component (31) generates a magnetic field with magnetic field lines pointing from the first part (311) to the second part (312) or from the second part (312) to the first part (311), and the magnetic field lines diverge along the outer contour of the second part (312) to the periphery of the second part (312).

2. The arc-extinguishing system according to claim 1, characterized in that, The magnetic field generating component (31) is a magnetic component or a permanent magnet.

3. The arc-extinguishing system according to claim 1, characterized in that, The cross-section of the magnetic field generating component (31) is U-shaped, C-shaped, C-shaped, or <-shaped.

4. The arc-extinguishing system according to claim 1, characterized in that, The first part (311) includes a plurality of first magnetic splicing components; And / or, the second part (312) includes a plurality of second magnetic splices.

5. The arc-extinguishing system according to claim 1, characterized in that, The arc-extinguishing chamber (3) includes an isolation shell (32), and the magnetic field generating component (31) is enclosed within the isolation shell (32).

6. The arc-extinguishing system according to claim 5, characterized in that, One or more protrusions (3211) are respectively provided on the outer wall surfaces of the isolation housing (32) on both sides of the reference line (10). Alternatively, the arc extinguishing system may further include two sets of grid plate groups (7), with two of the two sets of grid plate groups (7) respectively disposed on the outer wall surface on both sides of the reference line (10) on the isolation housing (32); the grid plate group (7) includes a plurality of grid plates arranged sequentially along the extension direction of the reference line (10).

7. The arc-extinguishing system according to claim 6, characterized in that, The isolation housing (32) includes a cylindrical body (321) and two end plates (322) respectively disposed at both ends of the cylindrical body (321); The magnetic field generating component (31) is disposed within the enclosed space formed by the cylinder (321) and the end plate (322).

8. The arc-extinguishing system according to claim 7, characterized in that, The isolation shell (32) is made of a gas-generating material; Alternatively, the cylinder (321) may be made of a gas-generating material; Alternatively, a gas-generating material may be provided on the outer wall surface of the isolation shell (32).

9. The arc-extinguishing system according to claim 1, characterized in that, It also includes a rotating shaft (4) and a moving arc-inducing plate (5); the moving contact (1) can rotate around the axis of the rotating shaft (4), and the two ends of the moving arc-inducing plate (5) are respectively connected to the outer circumferential surface of the arc-extinguishing chamber (3) and the rotating shaft (4); And / or, it also includes a stationary arc-drawing plate (6), the two ends of which are respectively connected to the stationary contact (2) and the arc-extinguishing chamber (3).

10. The arc-extinguishing system according to claim 9, characterized in that, The moving arc plate (5) is provided with a mounting ring (51) at one end near the rotating shaft (4); the mounting ring (51) is a circular ring structure or a semi-circular ring structure, and the mounting ring (51) is arranged around the periphery of the rotating shaft (4).

11. A circuit breaker, characterized in that, Including the arc extinguishing system as described in any one of claims 1 to 10.

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