Arc-quenching system and circuit breaker

Abstract

The present invention relates to the field of low-voltage electric apparatuses, and specifically to an arc-quenching system and a circuit breaker comprising the arc-quenching system. In the arc-quenching system, a plurality of arc chutes within an arc-quenching chamber are arranged side by side in a first direction; in a third direction, an arc inlet and an exhaust port of the arc-quenching chamber are respectively located at two ends of the arc-quenching chamber; in a second direction, front permanent magnets and rear permanent magnets of a magnetism-generating structure are arranged opposite each other on two sides of the arc-quenching chamber; and the first direction, the second direction, and the third direction are perpendicular to each other. A left rear permanent magnet and a right rear permanent magnet among the rear permanent magnets are arranged side by side in the first direction, and a left front permanent magnet and a right front permanent magnet among the front permanent magnets are arranged side by side in the first direction; in the second direction, the left rear permanent magnet and the left front permanent magnet have the same poles opposite each other and are arranged on two sides of the left portion of the arc-quenching chamber, and the right rear permanent magnet and the right front permanent magnet have the same poles opposite each other and are arranged on two sides of the right portion of the arc-quenching chamber; and magnetic poles of the same group of permanent magnets facing the arc-quenching chamber are opposite. The arc-quenching system can be used for quenching direct and alternating current arcs, with no special requirements for the wiring direction of a circuit breaker.

Description

Arc extinguishing system and circuit breaker

[0001] This application claims priority to Chinese patent application number 202310900031.1 and filing date July 21, 2023, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present invention relates to the field of low-voltage electrical appliances, and in particular to an arc extinguishing system and a circuit breaker comprising the arc extinguishing system. Background Art

[0003] Miniature circuit breakers typically consist of an operating mechanism, a contact mechanism, and an arc extinguishing chamber. The contact mechanism is implemented by a moving contact and a stationary contact. The operating mechanism drives the moving contact to swing into contact with the stationary contact, closing or opening the circuit breaker. To quickly stretch and extinguish the arc, permanent magnets are often placed around the arc extinguishing chamber to accelerate arc stretching and entry into the arc extinguishing chamber. However, the existing permanent magnet pole arrangement restricts the direction of current flow within the circuit breaker. This means that the incoming and outgoing wires cannot be connected reversely, posing a safety hazard.

[0004] Summary of the Invention

[0005] The purpose of the present invention is to overcome at least one defect of the prior art and provide an arc extinguishing system and a circuit breaker. The arc extinguishing system can be used to extinguish DC and AC arcs, and has no special requirements on the wiring direction of the circuit breaker.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] An arc extinguishing system includes an arc extinguishing chamber, the arc extinguishing chamber includes a plurality of arc extinguishing grids arranged side by side along a first direction, the arc extinguishing chamber includes an arc inlet and an exhaust port respectively located at two ends of the arc extinguishing chamber in a third direction, the arc inlet and the contact system of the circuit breaker are relatively matched; the arc extinguishing system also includes a magnetic generating structure, the magnetic generating structure includes two groups of permanent magnets arranged relatively on both sides of the arc extinguishing chamber in a second direction, the first direction, the second direction and the third direction are perpendicular to each other, one group of permanent magnets is a rear permanent magnet, and the rear permanent magnets include a left rear permanent magnet and a right rear permanent magnet arranged side by side along the first direction , the other group of permanent magnets is the front permanent magnets, and the front permanent magnets include a left front permanent magnet and a right front permanent magnet arranged side by side along the first direction; in the second direction, the arc extinguishing chamber is arranged between the front permanent magnet and the rear permanent magnet; in the first direction, the arc extinguishing chamber is divided into two parts, namely the left part and the right part of the arc extinguishing chamber; in the second direction, the left rear permanent magnet and the left front permanent magnet are arranged with the same poles on both sides of the left part of the arc extinguishing chamber, and the right rear permanent magnet and the right front permanent magnet are arranged with the same poles on both sides of the right part of the arc extinguishing chamber, and the magnetic poles facing the arc extinguishing chamber in the same group of permanent magnets are opposite.

[0008] Furthermore, the arc extinguishing chamber is entirely located in the magnetic field of the magnetic generating structure; the two groups of permanent magnets are also used to surround the contacts of the contact system from both sides.

[0009] Furthermore, the magnetic generating structure further includes two groups of partitions arranged relatively on both sides of the arc extinguishing chamber along the second direction and located between the two groups of permanent magnets, namely a rear partition and a front partition.

[0010] Furthermore, the partition includes a blocking surface and a boss provided on the blocking surface, the blocking surface being located on a side of the partition facing the arc extinguishing chamber, the arc extinguishing chamber being located between the two sets of blocking surfaces, the two sets of bosses being relatively spaced apart and located on one side of the arc inlet, the two sets of bosses being used to surround the contacts of the contact system from both sides, and the distance between the two sets of bosses being less than the distance between the two sets of blocking surfaces;

[0011] The partition also includes a left mounting groove and a right mounting groove arranged side by side along the first direction; the left rear permanent magnet and the right rear permanent magnet are respectively arranged in the left mounting groove and the right mounting groove of the rear partition, and the left front permanent magnet and the right front permanent magnet are respectively arranged in the left mounting groove and the right mounting groove of the front partition.

[0012] Furthermore, the arc extinguishing system also includes a left arc-striking plate and a right arc-striking plate arranged on both sides of the arc extinguishing chamber along the first direction and arranged side by side with the arc extinguishing grid; the two groups of permanent magnets, the left arc-striking plate and the right arc-striking plate enclose a first space, the arc extinguishing chamber as a whole is located in the first space, and the first space is also used to accommodate the contacts of the contact system.

[0013] Furthermore, the magnetic generating structure further includes two groups of magnetic conductive plates arranged on both sides of the arc extinguishing chamber along the second direction.

[0014] Furthermore, the two groups of magnetic conductive plates are respectively the rear magnetic conductive plates and the front magnetic conductive plates, the rear magnetic conductive plates and the arc extinguishing chambers are respectively located on both sides of the rear permanent magnet, and the front magnetic conductive plates and the arc extinguishing chambers are respectively located on both sides of the front permanent magnet.

[0015] Furthermore, the rear magnetic conductive plate includes a left rear magnetic conductive plate that cooperates with the left rear permanent magnet and a right rear magnetic conductive plate that cooperates with the right rear permanent magnet. The left rear magnetic conductive plate and the right rear magnetic conductive plate are arranged side by side along the first direction. The front magnetic conductive plate includes a left front magnetic conductive plate that cooperates with the left front permanent magnet and a right front magnetic conductive plate that cooperates with the right front permanent magnet. The left front magnetic conductive plate and the right front magnetic conductive plate are arranged side by side along the first direction.

[0016] Furthermore, the magnetic generating structure also includes two groups of partitions arranged relatively on both sides of the arc extinguishing chamber along the first direction, namely the rear partition and the front partition; the left rear magnetic conductive plate and the right rear magnetic conductive plate are respectively arranged in the left mounting groove and the right mounting groove of the rear partition, and the left front magnetic conductive plate and the right front magnetic conductive plate are respectively arranged in the left mounting groove and the right mounting groove of the front partition.

[0017] Furthermore, the rear magnetic conductive plate, right arc-starting plate, front magnetic conductive plate and left arc-starting plate are sequentially connected to form a second space, and the permanent magnet, the partition of the magnetic generating structure and the arc extinguishing chamber are all located in the second space.

[0018] Furthermore, the arc extinguishing system further comprises an arc isolation plate, which is used to move between the contacts of the contact system when the contact system is disconnected.

[0019] A circuit breaker comprises a contact system; the circuit breaker also comprises the arc extinguishing system, wherein the arc inlet of the arc extinguishing system is matched with the contact system.

[0020] Furthermore, the contact system includes a left contact and a right contact arranged relative to each other along a first direction. The left contact and the right contact rotate synchronously toward each other to close and rotate synchronously away from each other to open. The rotation directions of the left contact and the right contact are always opposite.

[0021] Furthermore, the arc-isolating plate of the arc extinguishing system is in transmission cooperation with the left contact or the right contact; when the left contact and the right contact are closed, the arc-isolating plate is driven to move out between the contact points of the left contact and the right contact; when the left contact and the right contact are disconnected, the arc-isolating plate is driven to move in between the contact points of the left contact and the right contact.

[0022] Furthermore, when the left contact and the right contact are closed, the contact points of the left contact and the right contact are located in the middle of the arc entrance of the arc extinguishing chamber in the first direction; when the left contact and the right contact are disconnected, the contact points of the left contact and the right contact are respectively located at the two ends of the arc entrance of the arc extinguishing chamber in the first direction.

[0023] The arc extinguishing system and circuit breaker of the present invention are characterized by an arrangement of the magnetic poles of the permanent magnets of the arc extinguishing system such that, regardless of the direction of the current in the circuit breaker, the two groups of permanent magnets on both sides of the arc extinguishing chamber jointly participate in blowing the arc into the arc extinguishing chamber, thereby increasing the speed at which the arc enters the arc extinguishing chamber and the arc extinguishing efficiency. The arc extinguishing system of this embodiment can be used to extinguish both DC arcs and AC arcs, and has no special requirements for the wiring direction of the circuit breaker.

[0024] In addition, the distance between the table surfaces of the bosses of the rear partition and the front partition is less than the distance between the blocking surfaces of the rear partition and the front partition, thereby utilizing the pressure difference to accelerate the arc into the arc extinguishing chamber and improve the arc extinguishing efficiency.

[0025] In addition, the arc extinguishing system further comprises an arc isolating plate, which is used to move between the contacts of the contact system when the contact system is disconnected, thereby forcibly isolating the arc between the contacts, which is conducive to accelerating the extinguishing of the arc. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] FIG1 is a schematic structural diagram of a circuit breaker of the present invention;

[0027] FIG2 is a schematic structural diagram of a circuit breaker according to the present invention, in which the operating mechanism is removed compared with FIG1 ;

[0028] FIG3 is a schematic diagram of the coordinated structure of the arc extinguishing system, the left contact, and the right contact of the present invention;

[0029] FIG4 is a cross-sectional view of the arc extinguishing system of the present invention, showing the assembly relationship between the partition, the permanent magnet, and the magnetic conductive plate;

[0030] FIG5 is a schematic structural diagram of the rear half shell of the present invention;

[0031] FIG6 is a schematic structural diagram of the front half shell of the present invention;

[0032] 7 is a schematic diagram of the assembly structure of the separator, permanent magnet and magnetic conductive plate of the present invention;

[0033] FIG8 is a schematic structural diagram of the rear baffle of the present invention at one viewing angle;

[0034] Figure 9.1 is a schematic structural diagram of the rear baffle of the present invention from another perspective;

[0035] Figure 9.2 is a schematic structural diagram of the front baffle of the present invention;

[0036] FIG10 is a diagram of the contact system of the present invention when disconnected, where the current direction is I0, i.e., the current flows sequentially through the left contact, the arc, and the right contact;

[0037] FIG11 is a moving trajectory of an arc with a current direction of I0 between the left rear permanent magnet and the left front permanent magnet according to the present invention;

[0038] FIG12 is a moving trajectory of an arc with a current direction of I0 between the right rear permanent magnet and the right front permanent magnet according to the present invention;

[0039] FIG13 is a moving trajectory of an arc with a current direction of I0 between two sets of permanent magnets according to the present invention;

[0040] FIG14 shows the contact system of the present invention when disconnected, where the current direction is I1, that is, the current flows through the right contact, the arc, and the left contact in sequence.

[0041] Description of Reference Numerals

[0042] o operating mechanism; c contact system;

[0043] 1 rear half shell; 1-1 rear half shell left mounting slot; 1-2 rear half shell right mounting slot; 1-3 rear half shell outlet plate; 2 front half shell; 2-1 front half shell left mounting slot; 2-2 front half shell right mounting slot; 2-3 front half shell outlet plate;

[0044] e arc extinguishing system;

[0045] 3 magnetic guide plates; 3-1 rear magnetic guide plate; 3-1-1 left rear magnetic guide plate; 3-1-2 right rear magnetic guide plate; 3-2 front magnetic guide plate; 3-2-1 left front magnetic guide plate; 3-2-2 right front magnetic guide plate;

[0046] 4 Partition; 4-1 Rear partition; 4-2 Front partition; 4a Left mounting slot; 4-1a Left rear mounting slot; 4-2a Left front mounting slot; 4b Right mounting slot; 4-1b Right rear mounting slot; 4-2b Right front mounting slot; 4c Boss; 40c Left boss; 41c Right boss; 4-1c Rear boss; 4-10c Left rear boss; 4-11c Right rear boss; 4d Blocking surface; 4-1d Rear blocking surface; 4e Partition plug-in structure; 4-1e Rear partition plug-in structure; 4-2e Front partition plug-in structure;

[0047] 5 permanent magnets; 5-1 left rear permanent magnet; 5-2 right rear permanent magnet; 5-3 left front permanent magnet; 5-4 right front permanent magnet;

[0048] 6 arc extinguishing chamber;

[0049] 7-1 left contact; 7-2 right contact;

[0050] 8-1 left arc starting plate; 8-2 right arc starting plate;

[0051] 9 Arc isolation plate. DETAILED DESCRIPTION

[0052] The following embodiments are given in conjunction with the accompanying drawings to further illustrate the specific implementation of the circuit breaker of the present invention. The circuit breaker of the present invention is not limited to the description of the following embodiments.

[0053] As shown in FIG1 , it is an embodiment of a circuit breaker of the present invention.

[0054] The circuit breaker of this embodiment includes a contact system c and an arc extinguishing system e. The arc extinguishing system e cooperates with the contact system c to extinguish arcs generated by the closing and opening of the contact system c. Furthermore, the circuit breaker of this embodiment includes an operating mechanism o, which is transmission-connected to the contact system c and is used to drive the contact system c to close and open.

[0055] As shown in Figures 1-4 and 7-9.2, this is an embodiment of the arc extinguishing system e.

[0056] As shown in Figures 2-4, the arc-extinguishing system e of this embodiment includes an arc-extinguishing chamber 6. The length, width, and height directions of the arc-extinguishing chamber 6 are respectively a first direction, a second direction, and a third direction. The first direction, the second direction, and the third direction are mutually perpendicular. The arc-extinguishing chamber 6 includes a plurality of arc-extinguishing grids arranged side by side along the first direction. The arc-extinguishing chamber 6 includes an arc inlet and an exhaust port located at both ends of the arc-extinguishing chamber 6 in the third direction. The arc inlet is aligned with the contact system c. Specifically, as shown in Figures 1-3, the left-right direction of the drawing is the length direction of the arc-extinguishing chamber 6 (i.e., the first direction), the inside-out direction of the drawing is the width direction of the arc-extinguishing chamber 6 (i.e., the second direction), and the top-bottom direction of the drawing is the height direction of the arc-extinguishing chamber 6 (i.e., the third direction).

[0057] Furthermore, the arc extinguishing chamber 6 further includes two arc extinguishing chamber mounting plates (not shown in the figure) arranged opposite to each other along the second direction, and the arc extinguishing grid of the arc extinguishing chamber 6 is fixed between the two arc extinguishing chamber mounting plates.

[0058] As another embodiment, the arc extinguishing chamber 6 is not provided with an arc extinguishing chamber mounting plate, but the arc extinguishing grid is directly mounted on the partition 4 of the arc extinguishing system.

[0059] As shown in Figures 2-4 and 7, the arc extinguishing system e of this embodiment also includes a magnetic generating structure, which includes two groups of permanent magnets 5 arranged relatively on both sides of the arc extinguishing chamber 6 along the second direction, one group of permanent magnets 5 is a rear permanent magnet, and the rear permanent magnets include a left rear permanent magnet 5-1 and a right rear permanent magnet 5-2 arranged side by side along the first direction, and the other group of permanent magnets 5 is a front permanent magnet, and the front permanent magnets include a left front permanent magnet 5-3 and a right front permanent magnet 5-4 arranged side by side along the first direction; in the first direction, the arc extinguishing chamber 6 is divided into two parts, namely the left part of the arc extinguishing chamber and the right part of the arc extinguishing chamber, and the left part of the arc extinguishing chamber and the right part of the arc extinguishing chamber are preferably two parts arranged continuously along the first direction; the left rear permanent magnet 5-1 and the left front permanent magnet 5-3 are arranged with the same poles on both sides of the left part of the arc extinguishing chamber, that is, the magnetic poles of the left rear permanent magnet 5-1 and the left front permanent magnet 5-3 are the same, both are S poles or N poles; the right rear permanent magnet 5-2 and the right front permanent magnet 5-4 are arranged with the same poles on both sides of the right part of the arc extinguishing chamber, that is, the magnetic poles of the right rear permanent magnet 5-2 and the right front permanent magnet 5-4 are the same, both are N poles or S poles; the magnetic poles of the same group of permanent magnets 5 facing the arc extinguishing chamber 6 are opposite, that is, the magnetic poles of the left rear permanent magnet 5-1 and the right rear permanent magnet 5-2 facing the arc extinguishing chamber 6 are opposite, and the magnetic poles of the left front permanent magnet 5-3 and the right front permanent magnet 5-4 facing the arc extinguishing chamber 6 are opposite. Specifically, the magnetic pole opposite to the left front permanent magnet 5-3 of the left rear permanent magnet 5-1 is the N pole, and the magnetic pole opposite to the right front permanent magnet 5-4 is the S pole, that is, the magnetic poles of the left rear permanent magnet 5-1 and the right rear permanent magnet 5-2 facing the arc extinguishing chamber 6 are opposite, and the magnetic poles of the left front permanent magnet 5-3 and the right front permanent magnet 5-4 facing the arc extinguishing chamber 6 are opposite; or, the magnetic pole opposite to the left front permanent magnet 5-1 and the left front permanent magnet 5-3 is the S pole, and the magnetic pole opposite to the right front permanent magnet 5-2 and the right front permanent magnet 5-4 is the N pole, that is, the magnetic poles of the left rear permanent magnet 5-1 and the right rear permanent magnet 5-2 facing the arc extinguishing chamber 6 are opposite, and the magnetic poles of the left front permanent magnet 5-3 and the right front permanent magnet 5-4 facing the arc extinguishing chamber 6 are opposite.

[0060] The arrangement of the two groups of permanent magnets 5 is such that, regardless of the direction of the current in the circuit breaker, the magnetic fields of the two groups of permanent magnets 5 on both sides of the arc extinguishing chamber 6 jointly participate in blowing the arc into the arc extinguishing chamber 6, thereby increasing the speed at which the arc enters the arc extinguishing chamber 6 and the arc extinguishing efficiency. The arc extinguishing system of this embodiment can be used to extinguish both DC arcs and AC arcs, and has no special requirements for the wiring direction of the circuit breaker.

[0061] Furthermore, as shown in Figures 2-4, the arc extinguishing chamber 6 is entirely located in the magnetic field of the magnetic generating structure; the two sets of permanent magnets 5 are also used to surround the contacts of the contact system c from both sides, that is, the contacts of the contact system c are always located between the two sets of permanent magnets 5 in the closed and open states, as well as in the process of switching between the two states. The above structural design ensures that the arc generated by the contact system c is within the magnetic field range of the magnetic generating structure, so that the magnetic field continuously acts on the arc, accelerates the arc's entry into the arc extinguishing chamber 6, and improves arc extinguishing efficiency. Specifically, the left contact 7-1 and the right contact 7-2 of the contact system c have one end of the contact inserted between the two sets of permanent magnets 5 for closing and opening.

[0062] The following will describe the principle of how the magnetic generating structure of this embodiment acts on the arc with reference to Figures 10-13:

[0063] As shown in FIG10 , when the left contact 7 - 1 and the right contact 7 - 2 are disconnected, the direction of the current flowing through the contact system c and the arc is I0, that is, the current flows through the left contact 7 - 1 , the arc between the left contact 7 - 1 and the right contact 7 - 2 , and the right contact 7 - 2 in sequence. As shown in Figure 11, it is a projection view of the left rear permanent magnet 5-1 and the left front permanent magnet 5-3 in the direction of the left arc-starting plate 8-1 toward the right arc-starting plate 8-2, and the S poles of the left rear permanent magnet 5-1 and the left front permanent magnet 5-3 are opposite; in the arc region between the left rear permanent magnet 5-1 and the left front permanent magnet 5-3, the current with a current direction of I0 generates a magnetic field perpendicular to the paper and outward, applying a downward force F1 to the arc, that is, blowing the arc toward the arc extinguishing chamber 6, and at the same time, the pressure difference formed by the boss 4c of the partition 4 also accelerates the arc to move toward the arc extinguishing chamber 6. After the arc moves to position a, the magnetic generating structure (that is, the two groups of permanent magnets 5) applies a rightward force F2 to it to move the arc to position b, and then the arc at position b is subjected to a downward force F3 applied to it by the magnetic generating structure, which continuously blows the arc into the arc extinguishing chamber 6. As shown in Figure 12, it is a projection view of the right rear permanent magnet 5-2 and the right front permanent magnet 5-4 in the direction of the left arc-starting plate 8-1 toward the right arc-starting plate 8-2, and the N poles of the right rear permanent magnet 5-2 and the right front permanent magnet 5-4 are opposite; in the arc region between the right rear permanent magnet 5-2 and the right front permanent magnet 5-4, the current with a current direction of I0 generates a magnetic field perpendicular to the paper and outward, applying a downward force F1 to the arc, that is, blowing the arc toward the arc extinguishing chamber 6, and at the same time, the pressure difference formed by the boss 4c of the partition 4 also accelerates the arc to move toward the arc extinguishing chamber 6. After the arc moves to position c, the magnetic generating structure applies a leftward force F4 to it to move the arc to position d, and then the arc at position d is subjected to a downward force F5 applied to it by the magnetic generating structure, which continuously blows the arc into the arc extinguishing chamber 6. As shown in Figure 13, there is a gap between the left rear permanent magnet 5-1 and the right rear permanent magnet 5-2, and there is a gap between the left front permanent magnet 5-3 and the right front permanent magnet 5-4. The two gaps form a transition area, which is conducive to stretching the arc longer (approximately S-shaped) between the two groups of permanent magnets 5, which is conducive to increasing the arc voltage and extinguishing the arc.

[0064] As shown in FIG14 , when the left contact 7-1 and the right contact 7-2 are disconnected, the current flowing through the contact system c and the arc is in the direction of I1. That is, the current flows through the right contact 7-2, the arc between the right contact 7-2 and the left contact 7-1, and the left contact 7-1 in sequence. In conjunction with FIG11 , the arc between the left rear permanent magnet 5-1 and the left front permanent magnet 5-3 is first subjected to a downward force F1 generated by the magnetic field perpendicular to the paper and inward, which blows the arc toward the arc extinguishing chamber 6. Simultaneously, the pressure difference created by the boss 4c of the partition 4 accelerates the arc's movement toward the arc extinguishing chamber 6. After the arc moves to position a, the magnetic generating structure exerts a leftward force on it, causing it to move to a position roughly symmetrical to position b. Thereafter, the arc is subjected to a downward force exerted by the magnetic field of the magnetic generating structure, continuously blowing the arc into the arc extinguishing chamber 6. As shown in Figure 12, the arc between the right rear permanent magnet 5-2 and the right front permanent magnet 5-4 is first subjected to a downward force F1 of the magnetic field perpendicular to the paper surface and inward generated by the current direction I1, which blows the arc toward the arc extinguishing chamber 6. At the same time, the pressure difference formed by the boss 4c of the partition 4 also accelerates the arc to move toward the arc extinguishing chamber 6. After the arc moves to position c, the magnetic generating structure applies a rightward force to it to move it to a position roughly symmetrical to position d, and then it is subjected to a downward force applied to it by the magnetic field of the magnetic generating structure, which continuously blows the arc into the arc extinguishing chamber 6.

[0065] It can be seen that no matter what the direction of the current flowing through the contact system c and the arc is when the contact system c is disconnected, the two groups of permanent magnets 5 of the magnetic generating structure will participate in the process of blowing the arc into the arc extinguishing chamber 6, thereby greatly improving the rate of blowing the arc into the arc extinguishing chamber 6, and there is no specific requirement for the wiring direction of the circuit breaker.

[0066] As shown in Figures 1-4 and 7-9.2, the magnetic generating structure further includes two groups of partitions 4, namely, a rear partition 4-1 and a front partition 4-2, arranged on both sides of the arc extinguishing chamber 6 relative to each other along the second direction and located between the two groups of permanent magnets 5. That is, the arc extinguishing chamber 6 is arranged on one side of the rear partition 4-1, and the left rear permanent magnet 5-1 and the right rear permanent magnet 5-2 are arranged on the other side of the rear partition 4-1. The arc extinguishing chamber 6 is arranged on one side of the front partition 4-2, and the left front permanent magnet 5-3 and the right front permanent magnet 5-4 are arranged on the other side of the front partition 4-2. The arc extinguishing chamber 6 is located between the rear partition 4-1 and the front partition 4-2. The partition 4 is arranged between the permanent magnet 5 and the arc extinguishing chamber 6 to separate the permanent magnet 5 from the arc, thereby preventing the permanent magnet 5 from being burned by the arc and affecting its magnetic blow function.

[0067] Furthermore, as shown in Figures 2-4, 7, and 9.1, the partition 4 includes a blocking surface 4d and a boss 4c provided on the blocking surface 4d. The blocking surface 4d is located on the side of the partition 4 facing the arc extinguishing chamber 6. The arc extinguishing chamber 6 is located between the two sets of blocking surfaces 4d. The two sets of bosses 4c protrude toward the middle of the two partitions 4. The two sets of bosses 4c are relatively spaced and located on the arc inlet side of the arc extinguishing chamber 6. The gap between the two sets of bosses 4c is connected to the arc inlet. The two sets of bosses 4c are used to The contacts of the side-enclosed contact system c, that is, the contacts of the contact system c are inserted between the two sets of bosses 4c. The contacts of the contact system c preferably close and open between the two sets of bosses 4c. The distance between the bosses 4c (that is, the bosses 4c of the rear partition 4-1 and the front partition 4-2) is less than the distance between the two sets of blocking surfaces 4d (that is, the blocking surfaces 4d of the rear partition 4-1 and the front partition 4-2). This utilizes the pressure difference to accelerate the arc into the arc extinguishing chamber 6, thereby improving arc extinguishing efficiency. Furthermore, the bosses 4c include a left boss 40c and a right boss 41c arranged side by side and spaced apart along a first direction; the left bosses 40c of the rear partition 4-1 and the front partition 4-2 are opposite, and the right bosses 41c of the rear partition 4-1 and the front partition 4-2 are opposite.

[0068] Specifically, as shown in Figure 9.1, the blocking surface 4d, boss 4c, left boss 40c, and right boss 41c of the rear baffle 4 are respectively the rear blocking surface 4-1d, rear boss 4-1c, left rear boss 4-10c, and right rear boss 4-11c. The blocking surface 4d, boss 4c, left boss 40c, and right boss 41c of the front baffle 4 are respectively the front blocking surface, front boss, left front boss, and right front boss.

[0069] Furthermore, the partition 4 may be made of a gas-generating material. The partition 4 is eroded by the arc to generate gas, and the arc is accelerated into the arc extinguishing chamber 6 through the gas blowing effect.

[0070] Furthermore, as shown in Figures 4, 7-8, the partition 4 also includes a left mounting slot 4a and a right mounting slot 4b arranged side by side along a first direction; the left rear permanent magnet 5-1 and the right rear permanent magnet 5-2 are respectively arranged in the left mounting slot 4a and the right mounting slot 4b of the rear partition 4-1, and the left front permanent magnet 5-3 and the right front permanent magnet 5-4 are respectively arranged in the left mounting slot 4a and the right mounting slot 4b of the front partition 4-2. Specifically, the left mounting slot 4a of the rear partition 4-1 and the front partition 4-2 are arranged on both sides of the arc extinguishing chamber 6 along the second direction, and the right mounting slot 4b of the rear partition 4-1 and the front partition 4-2 are arranged on both sides of the arc extinguishing chamber 6 along the second direction. The left mounting slot 4a and the right mounting slot 4b facilitate improving the installation reliability of the permanent magnet 5.

[0071] Specifically, as shown in FIG8 , the left mounting slot 4a and the right mounting slot 4b of the rear baffle 4-1 are the left rear mounting slot 4-1a and the right rear mounting slot 4-1b, respectively, and the left rear permanent magnet 5-1 and the right rear permanent magnet 5-2 are respectively arranged in the left rear mounting slot 4-1a and the right rear mounting slot 4-1b. As shown in FIG9.2 , the left mounting slot 4a and the right mounting slot 4b of the front baffle 4-2 are respectively the left front mounting slot 4-2a and the right front mounting slot 4-2b, respectively, and the left front permanent magnet 5-3 and the right front permanent magnet 5-4 are respectively arranged in the left front mounting slot 4-2a and the right front mounting slot 4-2b.

[0072] As shown in Figures 2-4, the arc extinguishing system e further includes a left arc-strike plate 8-1 and a right arc-strike plate 8-2 arranged on both sides of the arc extinguishing chamber 6 along a first direction and arranged side by side with the arc extinguishing grid of the arc extinguishing chamber 6; the two groups of permanent magnets 5, the left arc-strike plate 8-1, and the right arc-strike plate 8-2 enclose a first space, and the arc extinguishing chamber 6 is entirely located in the first space. The first space is also used to accommodate the contacts of the contact system c, that is, the contacts of the contact system c are located in the first space and are closed and opened in the first space, so that the arc generated by the closing and opening of the contact system c can be completely within the magnetic field range of the permanent magnet 5, and the left arc-strike plate 8-1 and the right arc-strike plate 8-2 are conducive to transferring the arc from the contact system c, reducing the ablation damage of the arc to the contacts. Furthermore, the first space is a square space.

[0073] As shown in Figures 2-4 and 7, the magnetic generating structure further includes two sets of magnetic conductive plates 3 arranged along the second direction on both sides of the arc extinguishing chamber 6. The magnetic conductive plates 3 facilitate enhancing the magnetic field of the permanent magnet 5, strengthening the magnetic blowing effect, and accelerating the arc into the arc extinguishing chamber 6. Furthermore, the two sets of magnetic conductive plates 3 are respectively a rear magnetic conductive plate 3-1 and a front magnetic conductive plate 3-2. The rear magnetic conductive plate 3-1 and the arc extinguishing chamber 6 are respectively located on both sides of the rear permanent magnet, and the front magnetic conductive plate 3-2 and the arc extinguishing chamber 6 are respectively located on both sides of the front permanent magnet. Furthermore, the rear magnetic conductive plate 3-1 includes a left rear magnetic conductive plate 3-1-1 that cooperates with the rear permanent magnet 5-1 and a right rear magnetic conductive plate 3-1-2 that cooperates with the right rear permanent magnet 5-2. The left rear magnetic conductive plate 3-1-1 and the right rear magnetic conductive plate 3-1-2 are arranged side by side and spaced apart along the first direction and are a split structure. The front magnetic conductive plate 3-2 includes a left front magnetic conductive plate 3-2-1 that cooperates with the left front permanent magnet 5-3 and a right front magnetic conductive plate 3-2-2 that cooperates with the right front permanent magnet 5-4. The left front magnetic conductive plate 3-2-1 and the right front magnetic conductive plate 3-2-2 are arranged side by side and spaced apart along the first direction and are a split structure.

[0074] As another embodiment, the rear magnetic conductive plate 3-1 is an integrated structure; and / or the front magnetic conductive plate 3-2 is an integrated structure.

[0075] Further, as shown in Figures 4 and 7, the left rear magnetic conductive plate 3-1-1 and the right rear magnetic conductive plate 3-1-2 are respectively arranged in the left mounting groove 4a and the right mounting groove 4b of the rear partition 4-1, that is, the left rear magnetic conductive plate 3-1-1, the left rear permanent magnet 5-1, the rear partition 4-1 and the arc extinguishing chamber 6 are stacked in sequence, and the right rear magnetic conductive plate 3-1-2, the right rear permanent magnet 5-2, the rear partition 4-1 and the arc extinguishing chamber 6 are stacked in sequence, and the left front magnetic conductive plate 3-2-1 and the right front magnetic conductive plate 3-2-2 are respectively arranged in the left mounting groove 4a and the right mounting groove 4b of the front partition 4-2, that is, the left front magnetic conductive plate 3-2-1, the left front permanent magnet 5-3, the front partition 4-2 and the arc extinguishing chamber 6 are stacked in sequence, and the right front magnetic conductive plate 3-2-2, the right front permanent magnet 5-4, the front partition 4-2 and the arc extinguishing chamber 6 are stacked in sequence.

[0076] Specifically, as shown in Figure 8, the left mounting groove 4a and the right mounting groove 4b of the rear partition 4-1 are the left rear mounting groove 4-1a and the right rear mounting groove 4-1b respectively, the left rear magnetic conductive plate 3-1-1 and the right rear magnetic conductive plate 3-1-2 are arranged in the left rear mounting groove 4-1a and the right rear mounting groove 4-1b respectively, the left rear magnetic conductive plate 3-1-1 and the left rear permanent magnet 5-1 are stacked in sequence from the outside to the inside in the left rear mounting groove 4-1a, and the right rear magnetic conductive plate 3-1-2 and the right rear permanent magnet 5-2 are stacked in sequence from the outside to the inside in the right rear mounting groove 4-1b. As shown in Figure 9.2, the left mounting slot 4a and the right mounting slot 4b of the front partition 4-2 are the left front mounting slot 4-2a and the right front mounting slot 4-2b respectively, the left front magnetic conductive plate 3-2-1 and the right front magnetic conductive plate 3-2-2 are arranged in the left front mounting slot 4-2a and the right front mounting slot 4-2b respectively, the left front magnetic conductive plate 3-2-1 and the left front permanent magnet 5-3 are stacked in sequence from the outside to the inside in the left front mounting slot 4-2a, and the right front magnetic conductive plate 3-2-2 and the right front permanent magnet 5-4 are stacked in sequence from the outside to the inside in the right front mounting slot 4-2b.

[0077] Furthermore, as shown in Figures 1-4, the rear magnetic conductive plate 3-1, the right arc-starting plate 8-2, the front magnetic conductive plate 3-2, and the left arc-starting plate 8-1 are sequentially connected to form a second space, and the permanent magnet 5, the partition 4, and the arc extinguishing chamber 6 are all located in the second space. Furthermore, the second space is preferably a square space.

[0078] As shown in FIG1 , the arc extinguishing system e further includes an arc-isolating plate 9, which is used to move between the contacts of the contact system c when the contact system c is disconnected, thereby forcibly isolating the arc between the contacts, which is conducive to accelerating the extinction of the arc. Furthermore, in the arc extinguishing system e of this embodiment, the arc-isolating plate 9 is arranged to move linearly. Of course, it is not ruled out that the arc-isolating plate 9 can be implemented in other ways of movement, such as curved movement or rotation. Furthermore, the arc-isolating plate 9 is in transmission cooperation with the left contact 7-1 or the right contact 7-2; when the left contact 7-1 and the right contact 7-2 are closed, the arc-isolating plate 9 is driven to move out from between the contacts of the left contact 7-1 and the right contact 7-2; when the left contact 7-1 and the right contact 7-2 are disconnected, the arc-isolating plate 9 is driven to move in between the contacts of the left contact 7-1 and the right contact 7-2.

[0079] As shown in FIG1-3, the contact system c includes a left contact 7-1 and a right contact 7-2, which are arranged opposite each other along a first direction. They rotate synchronously toward each other to close and rotate synchronously away from each other to open. The left contact 7-1 and the right contact 7-2 rotate in opposite directions, significantly increasing the opening distance while occupying less space. In conjunction with the arc extinguishing system e, this further accelerates the arc extinguishing speed. Furthermore, when the left contact 7-1 and the right contact 7-2 are closed, the contact points of the left contact 7-1 and the right contact 7-2 are located in the middle of the arc entrance of the arc extinguishing chamber 6 in the first direction. When the left contact 7-1 and the right contact 7-2 are opened, the contact points of the left contact 7-1 and the right contact 7-2 are located at opposite ends of the arc entrance of the arc extinguishing chamber 6 in the first direction. The magnetic fields of the two sets of permanent magnets 5 on both sides of the arc extinguishing chamber 6 act on the arc between the left contact 7-1 and the right contact 7-2, blowing the arc toward the arc entrance of the arc extinguishing chamber 6. It should be pointed out that the "left contact 7-1 and the right contact 7-2 rotate synchronously toward each other" means that the two contacts are closed by rotating so that the contacts are close to each other; the "left contact 7-1 and the right contact 7-2 rotate synchronously away from each other" means that the two contacts are disconnected by rotating so that the contacts are away from each other. Furthermore, the left contact 7-1 and the right contact 7-2 cooperate in transmission to achieve synchronous rotation of the two. Furthermore, the contact system c also includes a left support and a right support, the left support is pivotally arranged and used to carry the left contact 7-1, and the right support is pivotally arranged and used to carry the right contact 7-2, and the left support and the right support are connected in transmission. Furthermore, the left support includes a left gear, and the right support includes a right gear, and the left gear and the right gear are meshed. Furthermore, the arc isolation plate 9 includes a driven rack, and the left support or the right support is provided with a driving gear, which meshes with the driven rack, thereby synchronously driving the arc isolation plate 9 to move when the contact system c is closed and opened, and ensuring the reliability of the operation of the arc isolation plate 9.

[0080] As shown in Figures 1-2 and 5-6, the circuit breaker of this embodiment further includes a housing, within which is disposed an installation cavity for accommodating the arc extinguishing system e. The bottom wall of the installation cavity opposes the air outlet of the arc extinguishing chamber 6 and is provided with a plurality of exhaust holes connecting the air outlet of the arc extinguishing chamber 6 with the external environment. Furthermore, the housing includes a rear half-shell 1 and a front half-shell 2 that are relatively joined together along a second direction. The installation cavity is formed by the relative assembly of the rear half-cavity provided on the rear half-shell 1 and the front half-cavity provided on the front half-shell 2. The bottom wall of the installation cavity is formed by the relative assembly of the rear half-shell outlet plates 1-3 provided on the rear half-shell 1 and the front half-shell outlet plates 2-3 provided on the front half-shell 2.

[0081] Specifically, as shown in Figure 5, the rear half mounting cavity is divided into two parts in the first direction, namely the left mounting slot 1-1 of the rear half shell and the right mounting slot 1-2 of the rear shell, which are respectively opposite to the left mounting slot 4a and the right mounting slot 4b of the rear partition 4-1 (that is, the left rear mounting slot 4-1a and the right rear mounting slot 4-1b), the left rear magnetic conductive plate 3-1-1 and the left rear permanent magnet 5-1 are located in the space formed by the left mounting slot 1-1 of the rear half shell and the left mounting slot 4a (left rear mounting slot 4-1a) of the rear partition 4-1, and the right rear magnetic conductive plate 3-1-2 and the right rear permanent magnet 5-2 are located in the space formed by the right mounting slot 1-2 of the rear half shell and the right mounting slot 4b (right rear mounting slot 4-1b) of the rear partition 4-1. As shown in Figure 6, the front half mounting cavity is divided into two parts in the first direction, namely the left mounting slot 2-1 of the front half shell and the right mounting slot 2-2 of the front half shell, which are respectively opposite to the left mounting slot 4a and the right mounting slot 4b of the front partition 4-2 (that is, the left front mounting slot 4-2a and the right front mounting slot 4-2b), the left front magnetic conductive plate 3-2-1 and the left front permanent magnet 5-3 are located in the space formed by the left mounting slot 2-1 of the front half shell and the left mounting slot 4a (left front mounting slot 4-2a) of the front partition 4-2, and the right front magnetic conductive plate 3-2-2 and the right front permanent magnet 5-4 are located in the space formed by the right mounting slot 2-2 of the front half shell and the right mounting slot 4b (right front mounting slot 4-2b) of the front partition 4-2.

[0082] Furthermore, as shown in Figures 1-2, 5-7, and 9.1, the rear half shell 1 and the front half shell 2 are both provided with arc isolation plate guide rails, and the arc isolation plate 9 is respectively cooperated with the two sets of arc isolation plate guide rails for sliding and limiting to limit the moving trajectory of the arc isolation plate 9; the partition plate 4 is provided with an avoidance groove for avoiding the arc isolation plate guide rails, and the avoidance groove separates the boss 4c of the partition plate 4 into a left boss 40c and a right boss 41c.

[0083] Furthermore, as shown in Figures 5-6, 8, and 9.2, the rear partition 4-1 is pluggable with the rear half shell 1, and the front partition 4-2 is pluggable with the front shell 2. Furthermore, a partition plug-in structure 4e is provided on the side of the partition 4 facing away from the arc extinguishing chamber 6, and shell plug-in structures are provided on the bottom walls of both the rear half shell 1 and the front half shell 2. The partition plug-in structure 4e of the rear partition 4-1 plugs in with the shell plug-in structure of the rear half shell 1, and the partition plug-in structure 4e of the front partition 4-2 plugs in with the shell plug-in structure of the front half shell 2. Furthermore, the partition plug-in structure 4e is located between the left mounting groove 4a and the right mounting groove 4b, the shell plug-in structure of the rear half shell 1 is located between the left mounting groove 1-1 and the right mounting groove 1-2 of the rear half shell, and the shell plug-in structure of the front half shell 2 is located between the left mounting groove 2-1 and the right mounting groove 2-2 of the front half shell.

[0084] Specifically, as shown in FIG8 , the partition plug-in structure 4e of the rear partition 4 - 1 is a rear partition plug-in structure 4 - 1e, and the partition plug-in structure 4e of the front partition 4 - 2 is a front partition plug-in structure 4 - 2e.

[0085] It should be noted that, in the description of the present invention, the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are conventionally placed in use. They are intended solely for ease of description and do not necessarily require the devices or components referred to to have a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third," etc., are used solely for distinction and description and should not be construed as indicating relative importance.

[0086] The above is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific implementation of the present invention should not be considered to be limited to these descriptions. For those skilled in the art of the present invention, without departing from the concept of the present invention, several simple deductions or substitutions can be made, which should be considered to fall within the scope of protection of the present invention.

Claims

1. An arc extinguishing system, comprising an arc extinguishing chamber (6), the arc extinguishing chamber (6) comprising a plurality of arc extinguishing grids arranged side by side in a first direction, the arc extinguishing chamber (6) comprising an arc inlet and an exhaust port respectively located at two ends of the arc extinguishing chamber (6) in a third direction, the arc inlet being matched with a contact system (c) of a circuit breaker; Features: The arc extinguishing system further comprises a magnetic generating structure, the magnetic generating structure comprising two groups of permanent magnets (5) arranged relatively on both sides of the arc extinguishing chamber (6) along a second direction, the first direction, the second direction and the third direction being perpendicular to each other, one group of permanent magnets (5) being rear permanent magnets, comprising a left rear permanent magnet (5-1) and a right rear permanent magnet (5-2) arranged side by side along the first direction, and the other group of permanent magnets (5) being front permanent magnets, comprising a left front permanent magnet (5-3) and a right front permanent magnet (5-4) arranged side by side along the first direction; In the second direction, the arc extinguishing chamber (6) is arranged between the front permanent magnet and the rear permanent magnet; in the first direction, the arc extinguishing chamber (6) is divided into two parts, namely, a left part of the arc extinguishing chamber and a right part of the arc extinguishing chamber; in the second direction, the left rear permanent magnet (5-1) and the left front permanent magnet (5-3) are arranged with the same poles on both sides of the left part of the arc extinguishing chamber, and the right rear permanent magnet (5-2) and the right front permanent magnet (5-4) are arranged with the same poles on both sides of the right part of the arc extinguishing chamber, and the magnetic poles facing the arc extinguishing chamber (6) in the same group of permanent magnets (5) are opposite.

2. The arc extinguishing system according to claim 1, characterized in that: The arc extinguishing chamber (6) is located as a whole in the magnetic field of the magnetic generating structure; the two groups of permanent magnets (5) are also used to surround the contacts of the contact system (c) from both sides.

3. The arc extinguishing system according to claim 1, characterized in that: The magnetic generating structure further comprises two groups of partition plates (4) arranged relatively on both sides of the arc extinguishing chamber (6) along the second direction and located between the two groups of permanent magnets (5), which are respectively a rear partition plate (4-1) and a front partition plate (4-2).

4. The arc extinguishing system according to claim 3, characterized in that: The partition (4) comprises a blocking surface (4d) and a boss (4c) arranged on the blocking surface (4d), the blocking surface (4d) being located on the side of the partition (4) facing the arc extinguishing chamber (6), the arc extinguishing chamber (6) being located between the two groups of blocking surfaces (4d), the two groups of bosses (4c) being arranged with a relative spacing and being located on one side of the arc entrance, the two groups of bosses (4c) being used to surround the contacts of the contact system (c) from both sides, and the spacing between the bosses of the two groups of bosses (4c) being less than the spacing between the two groups of blocking surfaces (4d); The partition (4) further comprises a left mounting groove (4a) and a right mounting groove (4b) arranged side by side along a first direction; the left rear permanent magnet (5-1) and the right rear permanent magnet (5-2) are respectively arranged in the left mounting groove (4a) and the right mounting groove (4b) of the rear partition (4-1), and the left front permanent magnet (5-3) and the right front permanent magnet (5-4) are respectively arranged in the left mounting groove (4a) and the right mounting groove (4b) of the front partition (4-2).

5. The arc extinguishing system according to claim 1, characterized in that: The arc extinguishing system further comprises a left arc striking plate (8-1) and a right arc striking plate (8-2) which are arranged on both sides of the arc extinguishing chamber (6) along a first direction and are arranged side by side with the arc extinguishing grid; the two groups of permanent magnets (5), the left arc striking plate (8-1) and the right arc striking plate (8-2) enclose a first space, the arc extinguishing chamber (6) is located as a whole in the first space, and the first space is also used to accommodate contacts of the contact system (c).

6. The arc extinguishing system according to claim 5, characterized in that: The magnetic generating structure further comprises two groups of magnetic conductive plates (3) arranged on both sides of the arc extinguishing chamber (6) along the second direction.

7. The arc extinguishing system according to claim 6, characterized in that: The two groups of magnetic conductive plates (3) are respectively a rear magnetic conductive plate (3-1) and a front magnetic conductive plate (3-2); the rear magnetic conductive plate (3-1) and the arc extinguishing chamber (6) are respectively located on both sides of the rear permanent magnet; and the front magnetic conductive plate (3-2) and the arc extinguishing chamber (6) are respectively located on both sides of the front permanent magnet.

8. The arc extinguishing system according to claim 7, characterized in that: The rear magnetic conductive plate (3-1) comprises a left rear magnetic conductive plate (3-1-1) corresponding to the left rear permanent magnet (5-1) and a right rear magnetic conductive plate (3-1-2) corresponding to the right rear permanent magnet (5-2); the left rear magnetic conductive plate (3-1-1) and the right rear magnetic conductive plate (3-1-2) are arranged side by side and spaced apart along a first direction; the front magnetic conductive plate (3-2) comprises a left front magnetic conductive plate (3-2-1) corresponding to the left front permanent magnet (5-3) and a right front magnetic conductive plate (3-2-2) corresponding to the right front permanent magnet (5-4); the left front magnetic conductive plate (3-2-1) and the right front magnetic conductive plate (3-2-2) are arranged side by side and spaced apart along the first direction.

9. The arc extinguishing system according to claim 8, characterized in that: The magnetic generating structure further comprises two groups of partitions (4) arranged relatively on both sides of the arc extinguishing chamber (6) along a first direction, which are respectively a rear partition (4-1) and a front partition (4-2); the left rear magnetic conductive plate (3-1-1) and the right rear magnetic conductive plate (3-1-2) are respectively arranged in the left mounting groove (4a) and the right mounting groove (4b) of the rear partition (4-1), and the left front magnetic conductive plate (3-2-1) and the right front magnetic conductive plate (3-2-2) are respectively arranged in the left mounting groove (4a) and the right mounting groove (4b) of the front partition (4-2).

10. The arc extinguishing system according to claim 7, characterized in that: The rear magnetic conductive plate (3-1), the right arc-starting plate (8-2), the front magnetic conductive plate (3-2) and the left arc-starting plate (8-1) are sequentially connected to form a second space, and the permanent magnet (5), the partition plate (4) of the magnetic generating structure and the arc extinguishing chamber (6) are all located in the second space.

11. The arc extinguishing system according to claim 1, characterized in that: The arc extinguishing system further comprises an arc isolating plate (9), which is used to move between the contacts of the contact system (c) when the contact system (c) is disconnected.

12. A circuit breaker comprising a contact system (c); characterized in that: The circuit breaker further comprises an arc extinguishing system as claimed in any one of claims 1 to 11, wherein the arc inlet of the arc extinguishing system cooperates with the contact system (c).

13. The circuit breaker according to claim 12, characterized in that: The contact system (c) comprises a left contact (7-1) and a right contact (7-2) arranged relatively to each other along a first direction; the left contact (7-1) and the right contact (7-2) rotate synchronously towards each other to close and rotate synchronously away from each other to open; and the rotation directions of the left contact (7-1) and the right contact (7-2) are always opposite.

14. The circuit breaker according to claim 13, characterized in that: The arc-isolating plate (9) of the arc-extinguishing system is in transmission cooperation with the left contact (7-1) or the right contact (7-2); when the left contact (7-1) and the right contact (7-2) are closed, the arc-isolating plate (9) is driven to move out between the contact points of the left contact (7-1) and the right contact (7-2); when the left contact (7-1) and the right contact (7-2) are disconnected, the arc-isolating plate (9) is driven to move in between the contact points of the left contact (7-1) and the right contact (7-2).

15. The circuit breaker according to claim 13, characterized in that: When the left contact (7-1) and the right contact (7-2) are closed, the contact points of the left contact (7-1) and the right contact (7-2) are located in the middle of the arc entrance of the arc extinguishing chamber (6) in the first direction; when the left contact (7-1) and the right contact (7-2) are disconnected, the contact points of the left contact (7-1) and the right contact (7-2) are located at the two ends of the arc entrance of the arc extinguishing chamber (6) in the first direction.

Images