Arc isolating wall, arc extinguishing system and circuit breaker

Abstract

The utility model belongs to an arc-isolating wall structure, and provides an arc-isolating wall, an arc extinguishing system and a circuit breaker in order to solve the technical problems that the cost and the size of the circuit breaker can be greatly increased and the improvement effect is not ideal due to a method for improving the working voltage of a non-polar direct-current miniature circuit breaker in the prior art. Through grooves and arc-shaped grooves are formed in the first arc-isolating side wall and the second arc-isolating side wall of the arc-isolating wall, and the arc-shaped grooves play a role in guiding flow on one hand and can further lengthen the arc when the arc is compressed towards the arc-isolating wall under the action of electromagnetic force on the other hand. The through groove is formed, when the arc moves to the position of the through groove, if the current of the arc is small, the arc can enter the through groove under the action of electromagnetic force, and the arc is extinguished through the cooling and compression effects of the through groove on the arc. If the arc current is large, the arc strides the through groove area to enter the arc extinguishing chamber under the action of the strong upstream and downstream pressure gradient and the electromagnetic force generated by the arc current, and the arc extinguishing purpose is achieved.

Description

TECHNICAL FIELD

[0001] The application belongs to an arc separation wall structure, and particularly relates to an arc separation wall, an arc extinguishing system and a circuit breaker. BACKGROUND

[0002] The high-voltage development trend of photovoltaic and energy storage systems puts forward higher requirements for direct current circuit breakers. Especially when the second ground short circuit fault occurs in the direct current loop, the single-pole full-voltage short circuit current breaking of the direct current circuit breaker may be faced, and the single-pole of the direct current circuit breaker is required to have full-voltage breaking capacity.

[0003] Most of the non-polarity direct current micro circuit breakers are based on alternating current circuit breaker technology, and the working voltage is increased by increasing the opening distance, using ablation-resistant materials, increasing the number of grid plates, and multiple poles in series. However, these means greatly increase the cost and volume of the circuit breaker, and the improvement effect is not ideal. SUMMARY

[0004] The application provides an arc separation wall, an arc extinguishing system and a circuit breaker to solve the technical problem that the current method for improving the working voltage of the non-polarity direct current micro circuit breaker greatly increases the cost and volume of the circuit breaker, and the improvement effect is not ideal.

[0005] In order to achieve the above-mentioned purpose, the application adopts the following technical solutions:

[0006] In a first aspect, the application provides an arc separation wall, which comprises first and second arc separation side walls arranged in parallel and symmetrically.

[0007] The first and second arc separation side walls have the same structure; the end of the first arc separation side wall close to the arc extinguishing chamber is defined as the front, the end close to the contact is defined as the back, the side close to the first arc separation side wall is defined as the upper, and the side close to the second arc separation side wall is defined as the lower.

[0008] At least one through slot is formed in the front end of the first arc separation side wall close to the arc extinguishing chamber, and the through slot penetrates the upper surface and the lower surface of the first arc separation side wall.

[0009] An arc-shaped slot is formed in the back side of the first arc separation wall for accommodating a magnetic conductor; the arc-shaped slot is arranged along the trajectory of the arc column of the electric arc moving from the contact to the arc extinguishing chamber in the circuit breaker.

[0010] Further, the part of the first arc separation side wall where the through slot is formed is a flat plate structure.

[0011] Further, a blind slot is formed in the front end face of the flat plate structure to disconnect the through slot.

[0012] Further, a boss is further arranged on the first arc separation side wall.

[0013] The convex platform is located at the front end of the lower surface of the first arc separation side wall and at the front side of the frontmost through slot.

[0014] Further, the through slot is obliquely arranged, with the upper edge of the through slot being close to the contact and the lower edge being close to the arc extinguishing chamber.

[0015] Further, the arc separation wall is made of insulating material.

[0016] In a second aspect, the application provides an arc extinguishing system, which comprises a moving contact, a stationary contact, a moving arc horn, a stationary arc horn, a magnetic conductor, a permanent magnet and an arc extinguishing chamber; and further comprises the arc separation wall as described above.

[0017] The first polarity surface of the permanent magnet is in contact with the magnetic conductor, and the second polarity surface is in contact with the moving arc horn.

[0018] The magnetic conductor covers the arc-shaped slot.

[0019] Further, the magnetic conductor comprises first and second arc-shaped side walls which are parallel and symmetrically arranged, and the first and second arc-shaped side walls are structurally identical.

[0020] The first and second arc-shaped side walls are connected by a U-shaped connecting piece.

[0021] The first arc-shaped side wall is located above the first arc separation side wall and covers the arc-shaped slot of the first arc separation side wall; the second arc-shaped side wall is located below the second arc separation side wall and covers the arc-shaped slot of the second arc separation side wall; and the bottom of the U-shaped connecting piece is located between the first and second arc separation side walls.

[0022] The permanent magnet is located between the first and second arc separation side walls, and the first polarity surface of the permanent magnet is in contact with the U-shaped connecting piece.

[0023] Further, the upper surface of the first arc separation side wall partially covers the first arc-shaped side wall, and the lower surface of the second arc separation side wall partially covers the second arc-shaped side wall.

[0024] The arc extinguishing chamber is a metal grid arc extinguishing chamber and is located between the stationary arc horn and the moving arc horn.

[0025] In a third aspect, the application provides a circuit breaker, wherein the arc extinguishing system in the circuit breaker is the arc extinguishing system as described above.

[0026] Compared with the prior art, the application has the following beneficial effects:

[0027] The application provides an arc separation wall, arc-shaped grooves are arranged on a first arc separation side wall and a second arc separation side wall of the arc separation wall, and the arc-shaped grooves are used for corresponding accommodation of a magnetic conductor, thereby playing a flow guiding role and further lengthening the arc when the arc is compressed to the arc separation wall under the action of electromagnetic force. In addition, through grooves are arranged on the first arc separation side wall and the second arc separation side wall of the arc separation wall, and when the arc moves to the position of the through grooves, if the arc current is small, the arc will enter the through grooves under the action of electromagnetic force, and the arc is extinguished through the cooling and compression effect of the through grooves on the arc. If the arc current is large, the arc will enter the arc extinguishing chamber across the through groove area under the action of the strong pressure gradient of the upstream and downstream and the electromagnetic force generated by the arc current itself, so that the arc extinguishing purpose is achieved. Through the ingenious design of the structure of the arc separation wall and the arrangement of the arc-shaped grooves and the through grooves, the problem of non-polarity arc breaking from small current to short-circuit current under high voltage is effectively solved, and the promotion effect of the promotion of the working voltage of the non-polarity direct-current micro circuit breaker is ensured.

[0028] The application also provides an arc extinguishing system and a circuit breaker, which have all the advantages of the arc separation wall. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some of the embodiments of the application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0030] Figure 1 It is a schematic diagram of the arc extinguishing system of the application.

[0031] Figure 2 It is a schematic diagram of the installation of the arc separation wall, the magnetic conductor and the permanent magnet in the embodiments of the application.

[0032] Figure 3 It is a schematic diagram of the magnetic conductor in the embodiments of the application.

[0033] Figure 4 It is a schematic diagram of the setting mode of the flat plate structure and various through grooves in the embodiments of the application.

[0034] Among them: 1-arc separation wall, 101-first arc separation side wall, 102-second arc separation side wall, 2-arc extinguishing chamber, 3-through groove, 4-blind groove, 5- boss, 6-moving contact, 7-static contact, 8-moving arc angle, 9-static arc angle, 10-magnetic conductor, 1001-first arc-shaped side wall, 1002-second arc-shaped side wall, 1003-U-shaped connecting piece, 11-permanent magnet. DETAILED DESCRIPTION

[0035] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will be combined with the accompanying drawings for the embodiments of the present application to make a clear and complete description of the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the accompanying drawings can be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present application.

[0037] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0038] In the description of the embodiments of the present application, it should be noted that, if the orientation or position relationship indicated by the terms "upper", "lower", "horizontal", "inner" and the like is based on the orientation or position relationship shown in the drawings, or is the orientation or position relationship when the product of the present application is usually placed, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the present application. In addition, the terms "first", "second" and the like are only used for differentiation in description, and cannot be understood as indicating or implying relative importance.

[0039] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly inclined. For example, "horizontal" only means that its direction is relatively more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0040] In the description of the embodiments of the present application, it should also be noted that, unless otherwise explicitly specified and limited, if the terms "set", "mount", "connected", "connected" appear, they should be understood in a broad sense, for example, can be fixedly connected, can be detachably connected, or integrally connected; can be mechanically connected, can be electrically connected; can be directly connected, can be indirectly connected through an intermediate medium, or can be the communication inside two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0041] The non-polarity DC miniature circuit breaker is a miniature circuit breaker used in a DC circuit, which is characterized by no positive and negative poles, and can be connected at will without considering the polarity of input and output. In order to make the non-polarity DC miniature circuit breaker work reliably at a higher voltage level and meet the needs of various application scenarios, the non-polarity DC miniature circuit breaker can effectively improve its working voltage and breaking capacity by increasing the opening distance, using ablation-resistant materials, increasing the number of grid plates, and multiple poles in series. However, the current improvement effect is still not ideal, and the cost and size of the circuit breaker are greatly increased.

[0042] Based on the above, the application provides an arc separation wall, an arc extinguishing system and a circuit breaker. By designing a special magnetic field structure combined with an insulating narrow gap arc extinguishing system, and in some embodiments combined with a metal grid arc extinguishing system, the arc separation wall can effectively solve the problem of breaking non-polarity arc from small current to short circuit current at high voltage.

[0043] For the convenience of subsequent description, the front, back, up and down of the structure are defined: the end of the first arc separation side wall 101 close to the arc extinguishing chamber 2 is defined as the front, the end close to the contact is defined as the back, the side close to the first arc separation side wall 101 is defined as the up, and the side close to the second arc separation side wall 102 is defined as the down. It should be noted that the front, back, up and down defined here are all relative direction concepts.

[0044] As an embodiment of the arc separation wall of the application, it can include a first arc separation side wall 101 and a second arc separation side wall 102 arranged in parallel and symmetrically, and the first arc separation side wall 101 and the second arc separation side wall 102 are the same structure. The front end of the first arc separation side wall 101 close to the arc extinguishing chamber 2 is provided with at least one through slot 3, which penetrates the upper surface and the lower surface of the first arc separation side wall 101. An arc-shaped slot is provided on the back side of the first arc separation wall 101, which penetrates the upper surface and the lower surface of the first arc separation wall 101, and is used for corresponding storage of a magnetic conductor 10. The arc-shaped slot is arranged along the trajectory of the arc column in the circuit breaker moving from the contact to the arc extinguishing chamber 2. It should be noted that the arc-shaped slot is provided on the back side of the first arc separation wall 101, and the "back side" here is a relative position, which is in the rear area of the first arc separation wall 101, or relatively behind the through slot. In actual application, the number of arc-shaped slots can be one or more. If the arc-shaped slots are multiple, the corresponding magnetic conductors can cover multiple arc-shaped slots.

[0045] In actual application, the specific position, size and shape of the through slot 3 can be adjusted according to the use requirements, and the application does not make specific limitations. The angle of the arc-shaped slot is matched with the corresponding storage of the magnetic conductor.

[0046] The arc-shaped slot is arranged to guide the flow and further lengthen the arc when the arc is compressed by the electromagnetic force towards the arc separation wall. If the arc current is large, the arc will jump into the arc extinguishing chamber 2 through the through slot 3 region under the action of the strong pressure gradient and the electromagnetic force generated by the arc current itself, achieving the purpose of extinguishing the arc, thereby effectively solving the problem of non-polarity arc breaking from small current to short-circuit current at high voltage. The arrangement of the through slot 3 is lower in cost and processing difficulty for the overall structure, and is convenient for industrial application.

[0047] As another embodiment of the arc separation wall of the present application, the first arc separation side wall 101 and the second arc separation side wall 102 can be provided with one or more through slots 3. In actual application, the through slot 3 can be in the form of a narrow slot, and the specific width is determined according to actual use. In other embodiments of the present application, the specific structure of the through slot can also be adjusted. The narrow slot can be arranged at one end of the arc separation wall close to the arc extinguishing chamber 2, and the narrow slot is arranged in the axial direction of the arc. Generally, the first arc separation side wall 101 and the second arc separation side wall 102 are of the same structure and are mirror-symmetrically structured. In actual application, if special application requirements are encountered, the structures of the first arc separation side wall 101 and the second arc separation side wall 102 can also be made not exactly the same.

[0048] The part of the first arc separation side wall 101 provided with the through slot 3 can be an integral flat plate structure, or a blind slot 4 can be formed on the front end face of the flat plate structure to disconnect each through slot 3 and form several flat plate structures in a sawtooth-like interval. One or more bosses 5 can also be arranged on the front end of the lower surface of the first arc separation side wall 101 on the front side of the frontmost through slot 3. It should be noted that the number and specific structure of the boss 5 can be adjusted according to different needs, and the present application does not make specific limitations as long as the through slot 3 is not blocked. For example, Figure 4 Fig. 5 shows a schematic diagram of the flat plate structure and the arrangement of the through slot 3. Figure 4 Figs. 5(h) to (j) are schematic diagrams of the part of the first arc separation side wall 101 provided with the through slot 3, which is composed of several flat plate structures in a sawtooth-like interval. As can be seen from Figs. 5(h) to (j), the through slots 3 on both sides of the sawtooth can correspond, i.e. the through slots 3 on both sides of the sawtooth are disconnected by the sawtooth, or the through slots 3 on both sides of the sawtooth can be staggered. In addition, it should be noted that Figure 4 Figs. 5(a) and (g) are schematic diagrams of the flat plate structure without the through slot 3. Figs. 5(b) to (d), (e) to (f), (k) to (l) show different forms of the flat plate structure, and show schematic diagrams of different numbers and different styles of the through slot 3. It should be noted that the boss 5 is also arranged on the second arc separation side wall, and since the first arc separation side wall 101 and the second arc separation side wall 102 are of the same structure, further description is omitted.

[0049] In practical applications, the through slot 3 can be vertically arranged along the upper and lower edges of the arc separation wall 1, or can be arranged obliquely. If arranged obliquely, the end close to the upper edge of the arc separation wall 1 can be inclined towards the contact area. Among them, the upper edge refers to the end close to the static arc angle 9 of the circuit breaker involved, and the lower edge refers to the end close to the dynamic arc angle 8 of the circuit breaker involved.

[0050] In addition, regarding the material of the arc separation wall 1, a high-temperature-resistant insulating material can be used, and specific parameter requirements can be determined according to actual needs.

[0051] Based on the above-mentioned arc separation wall 1, the present application also proposes an arc extinguishing system, which can include a moving contact 6, a static contact 7, a dynamic arc angle 8, a static arc angle 9, a magnetic conductor 10, a permanent magnet 11 and an arc extinguishing chamber 2, and the arc separation wall adopts the structure of the arc separation wall 1 proposed in the present application.

[0052] It should be noted that the arc separation wall 1 is mainly used to isolate the arc and prevent the arc from spreading to other parts of the equipment, thereby protecting the equipment and personnel safety. The moving contact 6 is a contact point that moves with the action of the actuator, and the static contact 7 is a contact point that remains fixed without the action of the actuator. The magnetic conductor 10 is used to guide the magnetic field in the magnetic blow arc extinguishing system, enhancing the magnetic blow effect, thereby more effectively lengthening and cooling the arc, and promoting its extinction. The permanent magnet 11 may be used to generate a stable magnetic field in some arc extinguishing systems to assist the arc extinguishing process. The arc extinguishing chamber 2 is used to contain the arc and provide the necessary conditions (such as a specific gas environment, a magnetic field, etc.) to promote the extinction of the arc.

[0053] As an embodiment of the arc extinguishing system of the present application, as shown in Figure 3 Fig. 1 is a schematic diagram of a magnetic conductor 10, which can include a first arc-shaped side wall 1001 and a second arc-shaped side wall 1002 arranged in parallel and symmetrically, and the first arc-shaped side wall 1001 and the second arc-shaped side wall 1002 are structurally identical. The first arc-shaped side wall 1001 and the second arc-shaped side wall 1002 are connected by a U-shaped connecting piece 1003. The magnetic conductor 10 covers the arc-shaped slot, the first arc-shaped side wall 1001 covers the arc-shaped slot of the first arc separation side wall 101, and the second arc-shaped side wall 1002 covers the arc-shaped slot of the second arc separation side wall 102, which not only plays a guiding role, but also can further lengthen the arc when the arc is compressed towards the arc separation wall under the action of electromagnetic force. The first arc-shaped side wall 1001 is located above the first arc separation side wall 101, the second arc-shaped side wall 1002 is located below the second arc separation side wall 102, the bottom of the U-shaped connecting piece 1003 is located between the first arc separation side wall 101 and the second arc separation side wall 102, the permanent magnet 11 is located between the first arc separation side wall 101 and the second arc separation side wall 102, and the first polarity surface of the permanent magnet 11 is in contact with the U-shaped connecting piece 1003.

[0054] In practical applications, the arc length and the radian of the first arc-shaped side wall 1001 and the second arc-shaped side wall 1002 can be adapted to other components in the arc extinguishing system, and the present application does not make specific limitations. For example Figure 2 As shown in FIG. 1, it is a schematic diagram of the installation of the arc separation wall 1, the magnetic conductor 10 and the permanent magnet 11. The upper surface of the first arc separation side wall 101 covers the first arc-shaped side wall 1001, the lower surface of the second arc separation side wall 102 covers the second arc-shaped side wall 1002, and the arc extinguishing chamber 2 is a metal grid arc extinguishing chamber 2 located between the static arc angle 9 and the dynamic arc angle 8.

[0055] As shown in FIG. 1, it is a schematic diagram of the installation of the arc separation wall 1, the magnetic conductor 10 and the permanent magnet 11. The upper surface of the first arc separation side wall 101 covers the first arc-shaped side wall 1001, the lower surface of the second arc separation side wall 102 covers the second arc-shaped side wall 1002, and the arc extinguishing chamber 2 is a metal grid arc extinguishing chamber 2 located between the static arc angle 9 and the dynamic arc angle 8. Figure 1 As shown in FIG. 1, it is a schematic diagram of the installation of the arc separation wall 1, the magnetic conductor 10 and the permanent magnet 11. The upper surface of the first arc separation side wall 101 covers the first arc-shaped side wall 1001, the lower surface of the second arc separation side wall 102 covers the second arc-shaped side wall 1002, and the arc extinguishing chamber 2 is a metal grid arc extinguishing chamber 2 located between the static arc angle 9 and the dynamic arc angle 8.

[0056] Based on the above arc extinguishing system, the application also proposes a circuit breaker. The main function of the circuit breaker is to cut off and connect the load circuit, and cut off the circuit in case of fault to prevent the accident from expanding. The circuit breaker usually includes a housing, an operating mechanism, a contact system, an arc extinguishing system, a release, an insulating support element and a base, and a transmission mechanism. In practical application, the housing is usually used to isolate the internal gas from the external environment and provide structural strength, the operating mechanism is used to control the switching state of the circuit breaker, the contact system is the core part of executing the connection or disconnection of the circuit, usually including a main contact and an auxiliary contact, the main contact is mainly used for conducting current, and the auxiliary contact is used for connecting the external auxiliary circuit to monitor and control the state of the circuit breaker. The arc extinguishing system can quickly extinguish the arc and protect the equipment. The release is mainly used to realize automatic tripping, when the circuit is short-circuited or overloaded, the release will automatically act according to the change of the current, so that the circuit breaker trips and cuts off the circuit. In the insulating support element and the base, the insulating support element is used to support the fixed element and realize the insulation between each structure part, and the base is used to support and install each structure part of the switch. The transmission mechanism is mainly used to transmit the operating energy and the operating command provided by the operating mechanism to the on-off element, to ensure that the circuit breaker can operate according to the predetermined action sequence. In this embodiment, the arc extinguishing system in the circuit breaker adopts the arc extinguishing system proposed in the application. In addition, other components can adopt corresponding existing components to realize the overall function of the circuit breaker, and the application does not make specific limitations on other components.

[0057] It should be noted that the circuit breaker and the arc extinguishing system can adopt the specific embodiments of the arc separation wall 1 described above, which will not be repeated here.

[0058] The application utilizes the cooperation of the U-shaped magnetic conductor 10, the moving arc angle 8 and the permanent magnet 11 to generate an electromagnetic force driving the bidirectional direct current arc to the arc extinguishing chamber 2, and then sets an arc-shaped groove on the arc separation wall 1 according to the distribution difference of the arc driving magnetic field on the arc movement path and the morphological characteristics of the arc column, which plays a role in flow guiding on one hand and further lengthens the arc when the arc is compressed to the arc separation wall 1 under the action of the electromagnetic force on the other hand. At the same time, a through groove is arranged on the arc separation wall, when the arc moves to the position of the through groove 3, if the arc current is small, the arc will enter the through groove 3 under the action of the electromagnetic force, and the arc will be extinguished through the cooling and compression effect of the through groove 3 on the arc; if the arc current is large, the arc will enter the arc extinguishing chamber 2 across the through groove 3 area under the action of the strong pressure gradient of the upstream and downstream and the electromagnetic force generated by the arc current itself, to achieve the purpose of extinguishing the arc. The problem of non-polarity arc breaking from small current to short circuit current under high voltage is effectively solved.

[0059] The above merely provides preferred embodiments of the present application, and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the principles and technical scope of the present application shall fall into the scope of the present application.

Claims

1. An arc chute, characterized by: The arc separation wall (1) comprises a first arc separation side wall (101) and a second arc separation side wall (102) arranged in parallel and symmetrically. The first arc separation side wall (101) and the second arc separation side wall (102) are of the same structure. The first arc separation side wall (101) is defined as having a front end close to the arc extinguishing chamber (2), a rear end close to the contact, an upper side close to the first arc separation side wall (101), and a lower side close to the second arc separation side wall (102). At least one through slot (3) is formed in the front end of the first arc separation side wall (101) and penetrates the upper surface and the lower surface of the first arc separation side wall (101).

2. The arc wall according to claim 1, wherein: An arc-shaped slot is formed in the rear side of the first arc separation side wall (101) for accommodating the magnetic conductor (10).

3. The arc wall according to claim 2, wherein: The part of the first arc separation side wall (101) where the through slot (3) is formed is of a flat plate structure.

4. The arc wall according to any one of claims 1 to 3, wherein: A blind slot (4) is formed in the front end face of the flat plate structure to disconnect the through slot (3). The first arc separation side wall (101) is further provided with a boss (5).

5. The arc wall according to claim 4, wherein: The boss (5) is located at the front end of the lower surface of the first arc separation side wall (101) and at the front side of the frontmost through slot (3).

6. The arc wall according to claim 5, wherein: The through slot (3) is arranged obliquely, with the upper edge close to the contact and the lower edge close to the arc extinguishing chamber (2).

7. An arc quenching system comprising a moving contact (6), a stationary contact (7), a moving arc horn (8), a stationary arc horn (9), a magnetic conductor (10), a permanent magnet (11) and an arc chamber (2); characterized in that: The arc separation wall (1) is made of insulating material. The arc separation wall (1) of any one of claims 1 to 6 is further included. The first polarity surface of the permanent magnet (11) is in contact with the magnetic conductor (10), and the second polarity surface is in contact with the movable arc horn (8).

8. The arc extinguishing system of claim 7, wherein: The magnetic conductor (10) covers the arc-shaped slot. The magnetic conductor (10) comprises a first arc-shaped side wall (1001) and a second arc-shaped side wall (1002) arranged in parallel and symmetrically. The first arc-shaped side wall (1001) and the second arc-shaped side wall (1002) are connected by a U-shaped connecting piece (1003). The first arc-shaped side wall (1001) is located above the first arc separation side wall (101) and covers the arc-shaped slot of the first arc separation side wall (101); the second arc-shaped side wall (1002) is located below the second arc separation side wall (102) and covers the arc-shaped slot of the second arc separation side wall (102); and the bottom of the U-shaped connecting piece (1003) is located between the first arc separation side wall (101) and the second arc separation side wall (102).

9. The arc extinguishing system of claim 8, wherein: The permanent magnet (11) is located between the first arc separation side wall (101) and the second arc separation side wall (102), and the first polarity surface of the permanent magnet (11) is in contact with the U-shaped connecting piece (1003). The upper surface part of the first arc separation side wall (101) covers the first arc-shaped side wall (1001), and the lower surface part of the second arc separation side wall (102) covers the second arc-shaped side wall (1002).

10. A circuit breaker characterized by: The arc extinguishing chamber (2) is a metal grid arc extinguishing chamber (2) located between the static arc horn (9) and the movable arc horn (8). The arc extinguishing system in the circuit breaker adopts the arc extinguishing system of any one of claims 7 to 9. The arc extinguishing system in the circuit breaker adopts the arc extinguishing system of any one of claims 7 to 9.

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