Arc extinguishing structure of circuit breaker, and circuit breaker

Abstract

The present invention relates to the field of low-voltage electric appliances, and provides an arc extinguishing structure of a circuit breaker, which can be used for direct-current power distribution protection in the field of new energy and used for prolonging the service life of a contact and solving the problem of continuous arcing. The arc extinguishing structure of the present invention comprises a moving contact, a static contact, and a second arc extinguishing device; the second arc extinguishing device is arranged opposite to the moving contact and comprises a plurality of second arc extinguishing pieces; the arc extinguishing structure further comprises a first arc extinguishing device provided on the moving contact, and the first arc extinguishing device comprises a plurality of first arc extinguishing pieces for extinguishing some of electric arcs facing the moving contact, so that the arc extinguishing efficiency is further improved, and the service life of a product is prolonged. The present application further provides a circuit breaker, comprising the arc extinguishing structure, and thus, the arc extinguishing efficiency is high and the service life is long.

Description

Arc extinguishing structure of circuit breaker and circuit breaker

[0001] This application claims priority to Chinese patent application number CN 202311788422.5 and filing date December 25, 2023, and the entire contents of the above-mentioned Chinese patent application 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 structure of a circuit breaker and a circuit breaker, which can be applied to direct current distribution protection in new energy fields such as solar energy, wind energy, and nuclear energy. Background Art

[0003] Small DC currents in frame circuit breakers have no zero crossing point, and when the DC current is very small, it is difficult for the current to enter the arc extinguishing chamber, resulting in continuous arcing between the moving and static contacts during the opening process of the product, and part of the arc is directed towards the moving contact, affecting the service life of the moving contact.

[0004] In addition, the existing technical solutions for arc extinguishing with low DC current generally cause the product to have polarity. Generally, two magnets are symmetrically installed at the lower end of the arc extinguishing chamber. When the current is forward, the arc moves into the arc extinguishing chamber under the influence of the magnetic field of the magnets, thereby extinguishing the arc. However, when the current is reverse, the arc will move to the outside of the arc extinguishing chamber and cannot be extinguished, and the problem of continuous arcing still exists. Summary of the Invention

[0005] The object of the present invention is to overcome at least one defect of the prior art and to provide an arc extinguishing structure of a circuit breaker and a circuit breaker.

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

[0007] The arc extinguishing structure of the circuit breaker includes a moving contact, a static contact and a second arc extinguishing device. The second arc extinguishing device is arranged opposite to the moving contact and includes multiple second arc extinguishing plates. The circuit breaker also includes a first arc extinguishing device arranged on the moving contact. The first arc extinguishing device moves with the moving contact. The first arc extinguishing device includes multiple first arc extinguishing plates for extinguishing the arc toward the moving contact. The contact part between the moving contact and the static contact is located between the first arc extinguishing device and the second arc extinguishing device.

[0008] Preferably, at least one magnet group is further included, wherein the magnet group includes two magnets, and the contact portion between the moving contact and the static contact is located between the two magnets in the same group.

[0009] Preferably, the two magnets of the magnet group are arranged on the same straight line, the magnetic poles of the opposite surfaces of the two magnets are opposite or the same, and the line between the two magnets is perpendicular to the line between the first arc extinguishing device and the second arc extinguishing device.

[0010] Preferably, the magnet group is fixed on the first arc extinguishing device.

[0011] Preferably, the first arc extinguishing device includes an arc-blocking piece, the first arc-extinguishing piece is fixed in the middle of the arc-blocking piece, mounting parts are provided at both ends of the arc-blocking piece, two magnets in the same group are respectively fixed on the two mounting parts of the arc-blocking piece, and the mounting parts are closer to the contact part between the moving contact and the static contact than the first arc-extinguishing piece.

[0012] Preferably, the magnet is fixedly engaged with the mounting portion of the arc-blocking member, the mounting portion is provided with a magnet slot, and the magnet is inserted into the magnet slot of the arc-blocking member.

[0013] Preferably, both ends of the arc-blocking member extend upward to form two extension plates located on both sides of the first arc-extinguishing plate, and the mounting portion is a block structure attached to the extension plates, and the magnet slot is provided on the top of the block-shaped mounting portion.

[0014] Preferably, a plurality of arc-extinguishing plate grooves are provided in the middle of the arc-blocking member, and the first arc-extinguishing plate is inserted into the arc-extinguishing plate groove and has an interference fit with the arc-extinguishing plate groove.

[0015] Preferably, the magnet is a permanent magnet.

[0016] Preferably, the arc-stopping member of the first arc-extinguishing device is fixedly connected to the moving contact via a fixing screw, and both ends of the arc-stopping member extend to one side to form two fixing ears, and the fixing ears are provided with screw holes that cooperate with the fixing screws.

[0017] Preferably, the moving contact includes a contact support and a plurality of moving contact pieces arranged in the contact support, the contact support is provided with a mounting cavity, the plurality of moving contact pieces are arranged side by side and rotatably mounted on a rotating shaft, and are pre-tightened by a spring and arranged in the mounting cavity of the contact support, one end of the moving contact piece is provided with a moving contact point and extends out of the mounting cavity, the other end of the moving contact piece is electrically connected through a soft conductor, and the contact support is transmission-connected to the operating mechanism through a connecting rod.

[0018] Preferably, the arrangement direction of the plurality of first arc-extinguishing pieces is the same as the arrangement direction of the plurality of moving contact pieces.

[0019] The present invention also provides a circuit breaker, comprising any of the above-mentioned arc extinguishing structures of the circuit breaker.

[0020] The arc extinguishing structure and circuit breaker of the present invention are provided with a first arc extinguishing device linked to the moving contact, which is used to extinguish part of the arc toward the moving contact, further improving the arc extinguishing efficiency and increasing the service life of the product. The first arc extinguishing device is an additional arc extinguishing device fixed on the moving contact, without changing the original structure and layout of the circuit breaker, and has strong versatility and a compact and reasonable layout.

[0021] In addition, two magnets with opposite or identical magnetic poles are arranged between the two arc extinguishing devices to guide the arc into the arc extinguishing device, which can disconnect the forward and reverse small currents, realize non-polarity small current arc extinguishing, enhance the arc extinguishing effect of the circuit breaker, and improve the safety and reliability of use.

[0022] In addition, the magnet is arranged horizontally or vertically through the NS magnetic pole direction, so that the arc between the moving and static contacts is better guided into the two arc extinguishing devices above and below under the influence of the magnetic field of the magnet, and the arc extinguishing effect is better.

[0023] In addition, the magnet group, the first arc extinguishing device and the moving contact remain relatively stationary, which facilitates better introduction of the arc into the first arc extinguishing device for arc extinguishing, and has a good arc extinguishing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] FIG1 is a schematic diagram of the arc direction at the initial stage when the moving and static contacts separate when the current is reversed according to the present invention;

[0025] FIG2 is a schematic diagram of the arc direction at the ends of the moving and static contacts when the current is reversed according to the present invention;

[0026] FIG3 is a schematic diagram of the arc direction at the initial stage of separation of the moving and static contacts when the current is in the forward direction according to the present invention;

[0027] FIG4 is a schematic diagram of the arc direction at the end of the separation of the moving and static contacts when the current is in the forward direction according to the present invention;

[0028] 5 is a schematic structural diagram of the first arc extinguishing device, the magnet group and the moving and stationary contacts of the present invention;

[0029] FIG6 is a perspective view of the first arc extinguishing device, the magnet group and the moving contact of the present invention;

[0030] FIG7 is a schematic diagram of the magnetic poles of a magnet group with opposite magnetic poles in a disassembled state according to the present invention;

[0031] FIG8 is a schematic diagram of a magnet group with the same magnetic poles in a disassembled state according to the present invention;

[0032] FIG9 is an exploded view of the first arc extinguishing device and the magnet assembly of the present invention;

[0033] 10 is a schematic structural diagram of the arc blocking member of the present invention;

[0034] First arc extinguishing device 1; arc blocking member 11; mounting portion 111; arc extinguishing plate slot 112; magnet slot 113; extension plate 114; fixing ear 115; first arc extinguishing plate 12; second arc extinguishing device 2; second arc extinguishing plate 21; arc striking plate 22; magnet 3; moving contact 4; moving contact plate 41; rotating shaft 42; contact support 43; connecting rod 44; soft conductor 45; static contact 5; fixing screw 6; screw hole 61. DETAILED DESCRIPTION

[0035] The following embodiments are combined with the accompanying drawings to further illustrate the arc extinguishing structure of the circuit breaker and the specific implementation of the circuit breaker of the present invention. The arc extinguishing structure of the circuit breaker and the circuit breaker of the present invention are not limited to the description of the following embodiments.

[0036] As shown in Figures 1 to 4, the circuit breaker of this embodiment includes a moving contact 4, a stationary contact 5, and an arc extinguishing structure. The moving contact 4 contacts the stationary contact 5 to connect the circuit breaker, or separates to disconnect the circuit breaker. The moving contact 4 of this embodiment includes multiple moving contact pieces 41, which are arranged and rotatably mounted side by side. One side of the moving contact piece 41 is provided with a raised moving contact point for contacting the stationary contact 5. The stationary contact 5 of this embodiment is a block-shaped structure with a stationary contact point for mating with the moving contact. The moving contact and the stationary contact serve as the contact portion between the moving contact 4 and the stationary contact 5. Of course, the moving contact 4 can also be a single-piece structure, and the stationary contact 5 can also be a multi-piece assembly structure.

[0037] The arc extinguishing structure includes a second arc extinguishing device 2, which is used to eliminate the arc generated when the moving contact 4 and the static contact 5 of the circuit breaker are separated after contact and energization. When the circuit breaker is opened, most of the arc will enter the second arc extinguishing device 2. The second arc extinguishing device 2 is usually arranged near the static contact 5 and opposite to the moving contact 4. The second arc extinguishing device 2 includes multiple second arc extinguishing plates 21, and may also include arc-strike plates 22 for introducing the arc into the second arc extinguishing device 2. The second arc extinguishing device 2 is basically arranged corresponding to the movement trajectory of the moving contact 4. According to needs, multiple groups of second arc extinguishing devices 2 can be arranged on the movement trajectory corresponding to the moving contact 4, or as many second arc extinguishing plates 21 as possible can be arranged in one group of second arc extinguishing devices 2. The second arc extinguishing plates 21 can be arranged neatly, or they can be formed into a certain arc shape corresponding to the movement trajectory of the moving contact 4 to improve the arc extinguishing effect. This is the existing technology in this field and will not be repeated here.

[0038] As shown in Figures 1 to 4, an improvement of the arc extinguishing structure of this embodiment is that it also includes a first arc extinguishing device 1 provided on the moving contact 4. The first arc extinguishing device 1 includes a plurality of first arc extinguishing pieces 12. The first arc extinguishing device 1 is fixed on the moving contact 4 and moves with the moving contact 4 to extinguish part of the arc toward the moving contact 4, thereby further improving the arc extinguishing efficiency and the service life of the circuit breaker, especially for circuit breakers with a larger rated current. Obviously, the arc extinguishing structure of this embodiment can be used not only for circuit breakers, but also for other switching electrical appliances. As shown in Figures 1 to 4, the first arc extinguishing device 1 of this embodiment is fixed on the moving contact 4 and is linked to the moving contact 4; the contact portion between the moving contact 4 and the static contact 5 is located between the first arc extinguishing device 1 and the second arc extinguishing device 2. The second arc extinguishing device 2 extinguishes most of the arc, and the first arc extinguishing device 1 extinguishes the arc drifting toward the moving contact 4.

[0039] Another improvement of this embodiment is that the arc extinguishing structure further includes at least one magnet group, the magnet group includes two magnets 3, the contact portion between the moving contact 4 and the static contact 5 is located between the two magnets 3 of the same group, and the magnet group is used to move the arc into the first arc extinguishing device 1 or the second arc extinguishing device 2. Preferably, the magnet group is located between the first arc extinguishing device 1 and the second arc extinguishing device 2, close to the first arc extinguishing device 1 and away from the second arc extinguishing device 2. As a further improved embodiment, the magnet group in this embodiment is also linked to the moving contact 4, fixed on the first arc extinguishing device 1, and fixed to the moving contact 4 through the first arc extinguishing device 1. Of course, the magnet group can also be fixed independently on the moving contact 4.

[0040] The arc extinguishing structure of this embodiment is further described in detail below with reference to FIG. 1 to FIG. 8 :

[0041] The circuit breaker of this embodiment is a frame-type circuit breaker, used for circuits with higher rated currents, with rated currents reaching 1000A and above. It can be used to protect conventional power distribution systems as well as DC power distribution systems for renewable energy sources such as solar energy, wind energy, hydrogen energy, and nuclear energy. In this embodiment, the movable contact 4 includes a contact support 43 and multiple movable contact pieces 41 disposed within the contact support 43. The contact support 43 is provided with a mounting cavity. The multiple movable contact pieces 41 are rotatably mounted on a rotating shaft 42 and are preloaded within the mounting cavity of the contact support 43 by a spring. One end of the movable contact piece 41 is provided with a movable contact point, which extends out of the mounting cavity and is configured to engage with the static contact 5. The other end of the movable contact piece 41 is electrically connected via a flexible conductor 45. The contact support 43 is transmission-connected to an operating mechanism via a connecting rod 44. The operating mechanism can drive the contact support 43 to swing, driving the movable contact points of the movable contact pieces 41 to contact the static contact 5 to connect or disconnect the circuit breaker.

[0042] The arc extinguishing structure of this embodiment is used to eliminate the arc generated by the separation of the moving contact 4 and the static contact 5. It includes a first arc extinguishing device 1, a second arc extinguishing device 2, and at least one magnet group. The contact portion between the moving contact 4 and the static contact 5 of the circuit breaker and the magnet group are located between the first arc extinguishing device 1 and the second arc extinguishing device 2. The first arc extinguishing device 1, as an additional arc extinguishing device, is provided on the moving contact 4 and moves with the moving contact 4 to extinguish the portion of the arc directed toward the moving contact 4. In this embodiment, the first arc extinguishing device 1 is fixed to the moving contact 4 and is located on the side of the moving contact 4 away from the second arc extinguishing device 2. That is, the moving contact of the moving contact 4 is located between the first arc extinguishing device 1 and the second arc extinguishing device 2. The overall structure is simple, the layout is compact and reasonable, and there is no need to change the original structure and layout of the circuit breaker, which makes it highly versatile.

[0043] In this embodiment, the magnet group includes two magnets 3 arranged on the same straight line, which are used to move the arc into the first arc extinguishing device 1. The magnetic poles of the two magnets 3 on opposite sides are opposite or the same. The two magnets 3 with opposite magnetic poles are placed NS and NS or SN and SN as shown in Figure 7; the two magnets 3 with the same magnetic poles are placed NS and SN or SN and NS as shown in Figure 8. As shown in Figures 1 and 2, the first arc extinguishing device 1 and the second arc extinguishing device 2 are both provided with arc extinguishing plates. When the circuit breaker interrupts a small reverse current, an arc is generated between the moving contact 4 and the static contact 5 after they are separated. Part of the arc toward the moving contact will be accelerated to move toward the first arc extinguishing device 1 under the action of the electromagnetic force F of the magnet 3, so that the first arc extinguishing device 1 extinguishes the arc and interrupts the current; as shown in Figures 3 and 4, when the circuit breaker interrupts a small forward current, an arc is generated between the moving contact 4 and the static contact 5 after they are separated. Under the action of the electromagnetic force F of the magnet 3, the arc will be accelerated to move toward the second arc extinguishing device 2, so that the second arc extinguishing device 2 extinguishes the arc and interrupts the current.

[0044] The arc extinguishing structure and circuit breaker of the circuit breaker of this embodiment are arranged between two arc extinguishing devices through two magnets 3 with opposite or identical magnetic poles on opposite surfaces, which are used to guide the arc into the arc extinguishing device, can disconnect the forward and reverse small currents, realize non-polarity small current arc extinguishing, enhance the arc extinguishing effect of the circuit breaker, and improve the safety and reliability of use.

[0045] As shown in Figures 1 to 8, as a preferred solution for the positional relationship between the magnet group and the first arc extinguishing device 1, the second arc extinguishing device 2, and the contact part of the moving contact 4 and the static contact 5, the magnet group is located above the first arc extinguishing device 1 and below the second arc extinguishing device 2, close to the first arc extinguishing device 1 and away from the second arc extinguishing device 2, and the contact part of the moving contact 4 and the static contact 5 is located between the two magnets 3 in the same group, and the line connecting the two magnets 3 of the magnet group is substantially perpendicular to the line connecting the first arc extinguishing device 1 and the second arc extinguishing device 2. Preferably, the direction of the NS, NN, or SS poles of the magnet 3 is horizontal or vertical, wherein the direction of the NN or SS poles of the magnet 3 is horizontal, that is, the direction of the NS poles of the magnet 3 is vertical (not shown in the figure). The magnet 3 of this embodiment is preferably a permanent magnet. Of course, it can also be an electromagnet as other embodiments. The overall structure is simple, the layout is compact and reasonable, and the magnets are arranged horizontally or vertically through the NS magnetic pole direction. Under the influence of the magnetic field of magnet 3, the arc between the moving and static contacts is better guided into the two arc extinguishing devices above and below, achieving better arc extinguishing effect. Of course, the magnet group can also be arranged at an angle.

[0046] As shown in Figures 1 to 8 , as a preferred embodiment of the connection relationship between the magnet group, the first arc extinguishing device 1, and the moving contact 4, the magnet group, the first arc extinguishing device 1, and the moving contact 4 are linked together. The magnet 3 of the magnet group is fixed to the first arc extinguishing device 1, and the first arc extinguishing device 1 is fixed to the moving contact 4. The magnet group, the first arc extinguishing device 1, and the moving contact 4 remain relatively stationary, facilitating better introduction of the arc into the first arc extinguishing device 1 for arc extinguishing, resulting in a good arc extinguishing effect. The magnet group, the first arc extinguishing device 1, and the moving contact 4 are linked together in a fixed manner, resulting in a simple and stable structure.

[0047] As shown in Figures 9 and 10, the first arc-extinguishing device 1 of this embodiment includes an arc-stop member 11 and a plurality of first arc-extinguishing pieces 12. The arc-stop member 11 is preferably an integrally formed structure made of a gas-generating material. Mounting portions 111 are provided at both ends of the arc-stop member 11, positioned above the first arc-extinguishing pieces 12. Two magnets 3 from the same group are respectively fixed to the mounting portions 111 of the arc-stop member 11. In this embodiment, the magnets 3 are fixed to the inner sides of the mounting portions 111. The plurality of first arc-extinguishing pieces 12 are arranged in a row and fixed to the center of the arc-stop member 11. The mounting portions 111 are closer to the contact portion between the movable contact 4 and the static contact 5, and also closer to the second arc-extinguishing device 2, than the first arc-extinguishing pieces 12. The first arc-extinguishing device 1, magnets 3, and movable contact 4 are fixed together, resulting in a simple structure that facilitates installation within the circuit breaker without interfering with other components. The arrangement direction of the plurality of first arc-extinguishing pieces 12 of this embodiment is the same as that of the plurality of movable contact pieces 41, and the plane on which the first arc-extinguishing pieces 12 lie is parallel to the plane on which the movable contact pieces 41 lie. Of course, the arrangement direction of the movable contact piece 41 and the first arc extinguishing piece 12 includes but is not limited to the same, other angles are also possible, and the arc stop 11 may not be made of a gas-generating material. The structural design of this embodiment is to facilitate the orderly and reasonable layout of the various mechanisms of the circuit breaker, with a compact structure and space saving.

[0048] As shown in Figures 9 and 10, the fixing structure between the arc-stop member 11 and the first arc-extinguishing plate 12 of this embodiment is provided with a plurality of arc-extinguishing plate slots 112 in the middle portion of the arc-stop member 11 for mounting a plurality of first arc-extinguishing plates 12. The first arc-extinguishing plates 12 are inserted into the arc-extinguishing plate slots 112 and form an interference fit with the arc-extinguishing plate slots 112 to secure the first arc-extinguishing plates 12 to the arc-stop member 11. The interference fit structure is convenient and secure to install. Of course, the fixing between the arc-stop member 11 and the first arc-extinguishing plate 12 can also be achieved by fixed connection methods such as injection molding, clamping, and riveting.

[0049] As shown in Figures 9 and 10, the fixing structure between the arc-blocking member 11 and the magnet 3 of this embodiment is such that the magnet 3 is fixedly connected to the mounting portion 111 of the arc-blocking member 11, and the mounting portion 111 is provided with a magnet slot 113, and the magnet 3 is inserted into the magnet slot 113 of the arc-blocking member 11. Specifically, the two ends of the arc-blocking member 11 extend upward to form two extension plates 114 located on both sides of the first arc-extinguishing plate 12, and the mounting portion 111 is a block-shaped structure attached to the extension plate 114 in an integral manner, and the magnet slot 113 is provided on the top of the block-shaped mounting portion 111. The snap-fit ​​fixing structure is easy to install. Of course, the fixation between the arc-blocking member 11 and the magnet 3 can also be achieved by gluing or other fixed connection methods.

[0050] As shown in Figures 6 to 10, the fixing structure between the first arc extinguishing device 1 and the moving contact 4 of this embodiment is as follows: the first arc extinguishing device 1 is installed on the side of the moving contact 4 provided with the moving contact point. The arc-blocking member 11 of the first arc extinguishing device 1 is fixedly connected to the contact support 43 of the moving contact 4 by a fixing screw 6. The two ends of the arc-blocking member 11 extend to one side to form two fixing ears 115. The contact support 43 of the moving contact 4 is inserted between the two fixing ears 115 of the arc-blocking member 11. The fixing ears 115 and the contact support 43 of the moving contact 4 are provided with screw holes 61 that cooperate with the fixing screws 6. This structure is simple, compact and reasonable, easy to install, and space-saving.

[0051] As shown in Figures 1 to 4, the second arc extinguishing device 2 of this embodiment is an arc extinguishing chamber structure, including a plurality of second arc extinguishing pieces 21 arranged in rows, arc striking pieces 22 for striking an arc, and a mounting mechanism for mounting the second arc extinguishing pieces 21 and the arc striking pieces 22. The arrangement directions of the second arc extinguishing pieces 21 and the first arc extinguishing pieces 12 of this embodiment are both horizontal and perpendicular to each other, that is, the plurality of second arc extinguishing pieces 21 as shown in Figure 1 are arranged in sequence in the left-right direction, and the plurality of first arc extinguishing pieces 12 are arranged in sequence in the front-back direction. Of course, the arrangement directions of the second arc extinguishing pieces 21 and the first arc extinguishing pieces 12 include but are not limited to a vertical relationship, and other angles or parallel arrangements are also possible. The structural design of this embodiment is compact and space-saving in order to facilitate the orderly and reasonable layout of the various mechanisms of the circuit breaker. The structure of the second arc extinguishing device 2 of this embodiment is prior art and will not be described in detail here.

[0052] 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.

[0053] 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. Arc extinguishing structure of a circuit breaker, comprising a moving contact (4), a static contact (5) and a second arc extinguishing device (2), the second arc extinguishing device (2) being arranged opposite to the moving contact (4) and comprising a plurality of second arc extinguishing plates (21), characterized in that: It also comprises a first arc extinguishing device (1) arranged on the moving contact (4), the first arc extinguishing device (1) moves with the moving contact (4), the first arc extinguishing device (1) comprises a plurality of first arc extinguishing pieces (12) for extinguishing an arc directed toward the moving contact (4); The contact portion between the moving contact (4) and the stationary contact (5) is located between the first arc extinguishing device (1) and the second arc extinguishing device (2).

2. The arc extinguishing structure of the circuit breaker according to claim 1, characterized in that: It also comprises at least one magnet group, the magnet group comprising two magnets (3), the contact portion of the moving contact (4) and the stationary contact (5) being located between the two magnets (3) of the same group, and the magnet group being used to move the arc into the first arc extinguishing device (1) or the second arc extinguishing device (2).

3. The arc extinguishing structure of the circuit breaker according to claim 2, characterized in that: The two magnets of the magnet group are arranged on the same straight line, the magnetic poles of the opposite surfaces of the two magnets (3) are opposite or the same, and the line between the two magnets (3) is perpendicular to the line between the first arc extinguishing device (1) and the second arc extinguishing device (2).

4. The arc extinguishing structure according to claim 2 or 3, characterized in that: The magnet group is fixed on the first arc extinguishing device (1).

5. The arc extinguishing structure of the circuit breaker according to claim 4, characterized in that: The first arc extinguishing device (1) comprises an arc-blocking member (11), a first arc-extinguishing piece (12) is fixed at the middle of the arc-blocking member (11), mounting portions (111) are provided at both ends of the arc-blocking member (11), two magnets (3) of the same group are respectively fixed on the two mounting portions (111) of the arc-blocking member (11), and the mounting portions (111) are closer to the contact portion between the moving contact (4) and the stationary contact (5) than the first arc-extinguishing piece (12).

6. The arc extinguishing structure of the circuit breaker according to claim 5, characterized in that: The magnet (3) is fixedly connected to the mounting portion (111) of the arc-blocking member (11); a magnet slot (113) is provided on the mounting portion (111); and the magnet (3) is inserted into the magnet slot (113) of the arc-blocking member (11).

7. The arc extinguishing structure of the circuit breaker according to claim 6, characterized in that: The two ends of the arc-blocking member (11) extend upward to form two extension plates (114) located on both sides of the first arc-extinguishing plate (12); the mounting portion (111) is a block-shaped structure attached to the extension plates (114); and the magnet slot (113) is provided on the top of the block-shaped mounting portion (111).

8. The arc extinguishing structure of the circuit breaker according to claim 5, characterized in that: A plurality of arc extinguishing plate grooves (112) are provided in the middle of the arc blocking member (11), and the first arc extinguishing plate (12) is inserted into the arc extinguishing plate groove (112) and is interference-fitted with the arc extinguishing plate groove (112).

9. The arc extinguishing structure of the circuit breaker according to claim 2, characterized in that: The magnet (3) is a permanent magnet.

10. The arc extinguishing structure of the circuit breaker according to claim 5, characterized in that: The arc-blocking member (11) of the first arc-extinguishing device (1) is fixedly connected to the moving contact (4) via a fixing screw (6); two ends of the arc-blocking member (11) extend to one side to form two fixing ears (115); and the fixing ears (115) are provided with screw holes (61) that cooperate with the fixing screws (6).

11. The arc extinguishing structure of the circuit breaker according to claim 1, characterized in that: The moving contact (4) comprises a contact support (43) and a plurality of moving contact pieces (41) arranged in the contact support (43); the contact support (43) is provided with a mounting cavity; the plurality of moving contact pieces (41) are arranged side by side and rotatably mounted on a rotating shaft (42) and are pre-loaded in the mounting cavity of the contact support (43) by a spring; one end of the moving contact piece (41) is provided with a moving contact point and extends out of the mounting cavity; the other end of the moving contact piece (41) is electrically connected via a soft conductor (45); and the contact support (43) is transmission-connected to an operating mechanism via a connecting rod (44).

12. The arc extinguishing structure of the circuit breaker according to claim 11, characterized in that: The arrangement direction of the plurality of first arc-extinguishing pieces (12) is the same as the arrangement direction of the plurality of moving contact pieces (41).

13. Circuit breaker, characterized in that: It comprises the arc extinguishing structure of the circuit breaker according to any one of claims 1-12.

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