Arc extinguish chamber and circuit breaker

Abstract

The utility model relates to the technical field of low-voltage electric appliances, in particular to an arc extinguish chamber and a circuit breaker. The arc extinguish chamber is used for the circuit breaker, and the circuit breaker comprises a moving contact and a static contact. The arc extinguish chamber comprises a grid plate group, a movable run-on plate and a magnetism increasing piece; the movable contact is provided with a movable end used for being in contact with or separated from the static contact, the movable end tab comprises a fixed part and an extension part which are connected, the fixed part is arranged at the top of the grid piece group, and the extension part extends from the grid piece group to the movable end of the movable contact in a separated state; the magnetism increasing piece is arranged on the extending path of the extending part. By arranging the magnetism increasing piece on the extension path of the extension part, the magnetic blow-out force of the movable arc root moving towards the interior of the arc extinguish chamber can be improved, so that the arc can enter the arc extinguish chamber more easily, and the arc extinguish capacity of the arc extinguish chamber is improved. The magnetism increasing piece is arranged on the side, close to the moving contact, of the grid piece set, and the arc cutting effect of the grid piece set can be improved.

Description

Technical Field

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

[0002] A circuit breaker is a switch device that can close, carry and disconnect the current under normal circuit conditions, and can close, carry and disconnect the current under abnormal circuit conditions within a specified time. Usually, a circuit breaker includes structures such as a moving contact, a stationary contact and an arc extinguishing chamber. The moving and stationary contacts are connected to the circuit. When the moving contact and the stationary contact are disconnected, the arc is cut and extinguished by the arc extinguishing grid installed in the arc extinguishing chamber.

[0003] In the prior art, there are multiple arc extinguishing grids in the arc extinguishing chamber and they are arranged vertically in the arc extinguishing chamber. The number of arc extinguishing grids directly affects the arc extinguishing capacity of the arc extinguishing chamber. Under the influence of market demand, the number of arc extinguishing grids is increasing, and the height of the arc extinguishing chamber is increased accordingly. However, the rotation angle of the moving contact cannot be further increased due to the safety performance of the circuit breaker and the constraints of its own space, which makes it more difficult for the moving arc root to transfer into the arc extinguishing chamber, which is not conducive to the arc entering the arc extinguishing chamber, and may even fail to extinguish the arc normally, resulting in breaking failure. Utility Model Content

[0004] The first object of the utility model is to provide an arc extinguishing chamber to solve the technical problem in the prior art that the moving arc root is difficult to transfer into the arc extinguishing chamber, resulting in low arc extinguishing capacity of the arc extinguishing chamber.

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

[0006] An arc extinguishing chamber is used for a circuit breaker, the circuit breaker comprises a moving contact and a stationary contact, the arc extinguishing chamber comprises a grid plate group, a moving arc-starting plate and a magnetizing component;

[0007] The moving contact has a movable end for contacting or separating with the stationary contact; the moving arc-starting plate includes a fixed portion and an extending portion connected to each other, wherein: the fixed portion is arranged on the top of the grid plate group, and the extending portion extends from the fixed portion to the movable end of the moving contact in the separated state;

[0008] The magnetizing member is arranged on an extending path of the extending portion.

[0009] Furthermore, it also includes two arc extinguishing chamber side walls arranged on opposite sides of the grid group, and the magnetizing component is arranged between the two arc extinguishing chamber side walls.

[0010] Furthermore, the magnetizing component is connected to one or more of the moving arc-striking plate, the arc-extinguishing chamber side wall and the housing of the circuit breaker.

[0011] Furthermore, the magnetizing component is snap-connected, welded, or threadedly connected to the moving arc-starting plate.

[0012] Furthermore, the extension portion includes a first arc-starting section and a second arc-starting section, wherein: the first arc-starting section is arranged to be tilted downward from the fixed portion to the movable end of the moving contact in the separated state; the second arc-starting section is arranged to be tilted upward from the first arc-starting section to the top of the movable end of the moving contact in the separated state;

[0013] Alternatively, the extension portion is inclined downward from the fixed portion to the movable end of the moving contact in the separated state, and one end of the extension portion away from the fixed portion corresponds to the top of the movable end of the moving contact in the separated state.

[0014] Further, the extension portion includes the first arc-starting segment and the second arc-starting segment; the magnetizing component is arranged on the extension path of the first arc-starting segment or the second arc-starting segment;

[0015] Or, the extension portion includes the first arc-starting segment and the second arc-starting segment; the magnetizing component includes a first portion and a second portion that are integrally formed or independent of each other, the first portion and the second portion are arranged in a V-shape, and the first portion and the second portion are respectively arranged on the extension path of the first arc-starting segment and the extension path of the second arc-starting segment.

[0016] Furthermore, the magnetizing member is a plate-shaped structure, and the magnetizing member is arranged on a side of the extension portion away from the grid plate group;

[0017] Alternatively, the cross section of the magnetizing component is U-shaped, at least a portion of the extension portion is located inside the magnetizing component, and an opening side of the magnetizing component faces the grid plate group.

[0018] Furthermore, the magnetizing member includes at least one magnetizing sheet; when the magnetizing member includes a plurality of magnetizing sheets, the plurality of magnetizing sheets are stacked in a direction away from the extending portion;

[0019] Alternatively, the magnetizing component includes at least one independent arc-enhancing unit, and each of the arc-enhancing units includes at least one magnetizing sheet; when the magnetizing component includes a plurality of the arc-enhancing units, the plurality of the arc-enhancing units are arranged in sequence along the extension path of the extension portion; when the arc-enhancing unit includes a plurality of the magnetizing sheets, the plurality of the magnetizing sheets are stacked in a direction away from the extension portion.

[0020] Furthermore, the intensity of the magnetic field applied by the magnetizing member to the extension path of the extension portion tends to increase in a direction approaching the grid plate group.

[0021] The second object of the utility model is to provide a circuit breaker, comprising the arc extinguishing chamber described in any one of the above items.

[0022] Beneficial effects of the utility model:

[0023] The utility model provides an arc extinguishing chamber and a circuit breaker, wherein the arc extinguishing chamber is used for the circuit breaker, and the circuit breaker comprises a moving contact and a stationary contact; the arc extinguishing chamber comprises a grid sheet group, a moving arc-starting plate and a magnetizing component; the moving contact has a movable end for contacting or separating with the stationary contact, the moving arc-starting plate comprises a connected fixing portion and an extending portion, the fixing portion is arranged on the top of the grid sheet group, and the extending portion extends from the grid sheet group to the movable end of the moving contact in a separated state; the magnetizing component is arranged on an extending path of the extending portion.

[0024] By arranging a magnetizing component on the extension path of the extension part, the magnetic field strength in the extension path area of ​​the extension part can be enhanced, and the magnetic blowing force of the moving arc root moving into the arc extinguishing chamber can be increased, so that the arc is more likely to enter the arc extinguishing chamber, thereby improving the arc extinguishing ability of the arc extinguishing chamber and the working voltage and breaking performance of the circuit breaker product. The magnetizing component is arranged on the side of the grid group close to the moving contact, which can improve the cutting effect of the grid group on the arc and accelerate the extinguishing of the arc. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 A cross-sectional view of the arc extinguishing chamber provided by the utility model;

[0027] Figure 2 An exploded view of the arc extinguishing chamber provided by the utility model;

[0028] Figure 3 A schematic diagram of the structure of a movable arc-starting plate in an arc-extinguishing chamber provided in one embodiment of the utility model;

[0029] Figure 4 A schematic diagram of the structure of a movable arc-starting plate in an arc-extinguishing chamber provided in another embodiment of the utility model;

[0030] Figure 5 A schematic diagram of the connection structure between the moving arc-starting plate and the magnetizing component in the arc-extinguishing chamber provided in one embodiment of the utility model;

[0031] Figure 6 A schematic diagram of the structure of the magnetizing component provided in Embodiment 1 and Embodiment 2 of the present utility model;

[0032] Figure 7A schematic diagram of the structure of a magnetizing component provided in Embodiment 3 of the present utility model;

[0033] Figure 8 A schematic diagram of the structure of the magnetizing member provided in the fourth embodiment of the utility model when the first part and the second part are integrally formed;

[0034] Fig. 9 A schematic diagram of the structure of the magnetizing member provided in the fourth embodiment of the utility model when the first part and the second part are independent of each other;

[0035] Fig.10 A schematic diagram of the structure of a magnetizing component provided in Embodiment 5 of the present utility model;

[0036] Fig.11 This is a schematic structural diagram of the magnetizing component provided in Example 6 of the utility model.

[0037] icon:

[0038] 100-moving contact;

[0039] 200-static contact;

[0040] 1-grid group; 2-moving arc-starting plate; 21-fixed part; 22-extending part; 221-first arc-starting section; 222-second arc-starting section; 23-second clamping block; 24-first clamping block; 3-magnetizing component; 31-magnetizing plate; 4-side wall of arc extinguishing chamber. DETAILED DESCRIPTION

[0041] The technical solution of the utility model will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0042] It should be noted that in the description of the present invention, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0043] It should be noted that in the description of the present invention, the terms "connection" and "installation" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or connected through an intermediate medium; it can be a mechanical connection or an electrical connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] Under the influence of market demand, the number of arc extinguishing grids is increasing, but the distance between the moving and static contacts cannot be further increased due to the limitation of product structure, which makes it more difficult to transfer the moving arc root into the arc extinguishing chamber, and thus leads to lower arc extinguishing capacity of the arc extinguishing chamber.

[0045] Based on this, an embodiment of the present application provides an arc extinguishing chamber, which is used for a circuit breaker. The circuit breaker includes a moving contact 100 and a stationary contact 200; Figures 1 to 3 The arc extinguishing chamber includes a grid group 1, a moving arc-starting plate 2 and a magnetizing component 3;

[0046] The moving contact 100 has a movable end for contacting or separating with the stationary contact 200; the moving arc-starting plate 2 includes a fixed portion 21 and an extending portion 22 connected to each other, wherein: the fixed portion 21 is arranged on the top of the grid group 1, and the extending portion 22 extends from the fixed portion 21 to the movable end of the moving contact 100 in the separated state;

[0047] The magnetizing member 3 is arranged on the extension path of the extension portion 22 .

[0048] Figure 1 The dashed line in represents the arc; refer to Figure 1 By arranging a magnetizing component 3 on the extension path of the extension part 22, the magnetic field strength in the extension path area of ​​the extension part 22 can be enhanced, and the magnetic blowing force of the arc at the moving contact end moving toward the inside of the arc extinguishing chamber can be increased, making it easier for the arc to enter the arc extinguishing chamber, thereby improving the arc extinguishing capacity of the arc extinguishing chamber and the operating voltage and breaking performance of the circuit breaker product.

[0049] Reference Figure 2 The arc extinguishing chamber further comprises two arc extinguishing chamber side walls 4 arranged on opposite sides of the grid group 1. The grid group 1 comprises a plurality of arc extinguishing grids arranged in a vertical direction. The opposite sides of each arc extinguishing grid are respectively clamped on the two arc extinguishing chamber side walls 4. The arc extinguishing chamber side walls 4 can be made of gas-generating materials or gas-generating materials are arranged on the arc extinguishing chamber side walls 4. The gas-generating materials can generate a large amount of gas after the circuit is disconnected. The generated gas blows the arc to transfer into the arc extinguishing chamber, thereby accelerating the arc extinction.

[0050] In this embodiment, the magnetizing member 3 is disposed between the two arc extinguishing chamber side walls 4, so that the arc moves between the two arc extinguishing chamber side walls 4 to prevent the arc from deviating. Optionally, the two sides of the magnetizing member 3 are spaced apart from or abut against the two arc extinguishing chamber side walls 4 respectively.

[0051] On the basis of the above structure, the two opposite sides of the magnetizing component 3 are respectively in contact with the two arc extinguishing chamber side walls 4. On the one hand, the above arrangement can block the opening above the arc extinguishing chamber through the magnetizing component 3 to prevent the arc or charged particles from overflowing from the top of the arc extinguishing chamber; on the other hand, the magnetizing component 3 can be limited by the two arc extinguishing chamber side walls 4 to prevent the magnetizing component 3 from shaking or even shifting, thereby improving the stability of the arc extinguishing chamber structure.

[0052] In the above structure, the moving arc-starting plate 2 is made of conductive material, such as steel plate, etc.; the magnetizing component 3 is made of ferromagnetic material. The conductive property of the moving arc-starting plate 2 promotes the moving arc root to enter the arc extinguishing chamber along the extension part 22; the magnetizing component 3 is arranged on the extension path of the extension part 22, which increases the magnetic blowing force in the extension path area of ​​the extension part 22, and is more conducive to the arc entering the arc extinguishing chamber.

[0053] Optionally, the extension portion 22 and the magnetizing member 3 are in contact or spaced apart, wherein:

[0054] When the extension part 22 and the magnetizing member 3 are in contact, the resistivity of the extension part 22 is less than that of the magnetizing member 3, which is conducive to the current flowing through the extension part 22 and avoiding the current flowing through the magnetizing member 3 to affect the magnetic field strength generated by the magnetizing member 3;

[0055] When the extension portion 22 and the magnetizing member 3 are spaced apart from each other, the resistivity of the extension portion 22 has nothing to do with the resistivity of the magnetizing member 3 .

[0056] As an optional embodiment, the magnetizing component 3 is connected to one or more components among the moving arc-striking plate 2, the arc-extinguishing chamber side wall 4 and the housing of the circuit breaker.

[0057] Reference Figure 3 A plurality of second clamping blocks 23 are respectively arranged on opposite sides of the fixing portion 21 , and the second clamping blocks 23 on opposite sides of the fixing portion 21 are respectively clamped on the two arc extinguishing chamber side walls 4 to fix the moving arc striking plate 2 .

[0058] In this embodiment, the magnetizing component 3 is installed on the moving arc-striking plate 2; optionally, the magnetizing component 3 is clamped, welded, or threaded on the moving arc-striking plate 2. In this embodiment, the magnetizing component 3 is in contact with the moving arc-striking plate 2, so the moving arc-striking plate 2 is made of a highly conductive material, and its resistivity is less than the resistivity of the magnetizing component 3. In the technology of the above structure, in order to improve the installation strength of the magnetizing component 3, the magnetizing component 3 can also be auxiliary fixed by the arc extinguishing chamber side wall 4 and the housing of the circuit breaker.

[0059] For example, refer to Figure 4 and Figure 5 , two first clamping blocks 24 are arranged on the moving arc-starting plate 2 at intervals, and the magnetizing component 3 is clamped between the two first clamping blocks 24, and the displacement of the magnetizing component 3 from the moving contact 100 to the grid group 1 can be limited by the two first clamping blocks 24; the opposite sides of the magnetizing component 3 are respectively abutted against the two arc-extinguishing chamber side walls 4, and the displacement of the magnetizing component 3 between the two arc-extinguishing chamber side walls 4 can be limited by the two arc-extinguishing chamber side walls 4; the side of the magnetizing component 3 close to the grid group 1 abuts against the moving arc-starting plate 2, and the side of the magnetizing component 3 away from the grid group 1 abuts against the housing of the circuit breaker, and the displacement of the magnetizing component 3 in the height direction is limited by the moving arc-starting plate 2 and the housing of the circuit breaker. Therefore, the magnetizing component 3 is completely fixed inside the arc-extinguishing chamber through multi-directional limiting, and no fasteners such as screws are required, which is convenient for loading and unloading the magnetizing component 3.

[0060] In other embodiments, a protrusion may be provided on one surface of the magnetizing component 3 close to the arc extinguishing chamber side wall 4, and a groove may be provided at a corresponding position of the arc extinguishing chamber side wall 4, and the protrusion on the magnetizing component 3 and the groove on the arc extinguishing chamber side wall 4 may be plugged into and fit with each other to fix the magnetizing component 3 between the two arc extinguishing chamber side walls 4.

[0061] As an optional embodiment, the magnetizing member 3 is a plate-shaped structure, and the magnetizing member 3 is arranged on a side of the extension portion 22 away from the grid group 1;

[0062] Alternatively, the cross section of the magnetizing component 3 is U-shaped, at least part of the extension portion 22 is located inside the magnetizing component 3 , and the opening side of the magnetizing component 3 faces the grid assembly 1 .

[0063] Among them, the plate-shaped magnetizing component 3 has the advantages of simple structure and convenient manufacturing; the U-shaped magnetizing component 3 has a stronger magnetic field strength, which is more conducive to transferring the arc into the arc extinguishing chamber.

[0064] Continue to refer to Figure 1 When the movable end of the moving contact 100 and the stationary contact 200 are separated, there is a height difference between the top of the grid plate group 1 and the movable end of the moving contact 100 in the vertical direction.

[0065] Based on the above structure, refer to Figure 2 and Figure 3 The extension portion 22 includes a first arc-starting segment 221 and a second arc-starting segment 222, wherein:

[0066] The first arc-starting section 221 is arranged to be tilted downward from the fixed portion 21 to the movable end of the moving contact 100 in the separated state;

[0067] The second arc-striking section 222 is arranged to be inclined upward from the first arc-striking section 221 to the top of the movable end of the moving contact 100 in the separated state.

[0068] On the basis of the above structure, the magnetizing member 3 is arranged on the extension path of the first arc-starting section 221 or the second arc-starting section 222;

[0069] Alternatively, the magnetizing component 3 includes a first portion and a second portion which are integrally formed or independent of each other, and the first portion and the second portion are respectively arranged on the extension path of the first arc-starting segment 221 and the extension path of the second arc-starting segment 222 .

[0070] In the above structure, the second arc-starting section 222 can increase the relative length between the extension part 22 and the moving contact 100, thereby increasing the arc-starting effect. The moving arc-starting plate 2 and the magnetizing member 3 cooperate to increase the magnetic blowing force at the extension part 22, and the arc is pulled upward obliquely from the moving contact 100 to the top of the arc-extinguishing chamber by the magnetic blowing force, so that the moving arc root is transferred to the top of the arc-extinguishing chamber along the first arc-starting section 221, so that the arc-extinguishing grid above the arc-extinguishing chamber can be fully utilized, the arc-extinguishing grid cutting effect on the arc can be improved, and the arc-extinguishing ability of the arc-extinguishing chamber can be maximized to achieve the purpose of quickly extinguishing the arc.

[0071] In other embodiments, the second arc-starting section 222 may not be provided. That is, the extension portion 22 is arranged to be tilted downward from the fixed portion 21 to the movable end of the moving contact 100 in the separated state, and the end of the extension portion 22 away from the fixed portion 21 corresponds to the top of the movable end of the moving contact 100 in the separated state. Although this structure can also achieve the arc-starting effect, its performance is inferior to that of this embodiment.

[0072] In the present application, the magnetizing member 3 has a variety of configurations. The following embodiments are several configurations of the magnetizing member 3:

[0073] Embodiment 1

[0074] Reference Figure 5 and Figure 6 In this embodiment, the magnetizing component 3 is arranged on the first arc-starting segment 221 or the second arc-starting segment 222; the magnetizing component 3 is a U-shaped structure, at least part of the first arc-starting segment 221 or the second arc-starting segment 222 is located in the magnetizing component 3, and the U-shaped structure opens toward the grid group 1.

[0075] Embodiment 2

[0076] Reference Figure 6 In this embodiment, the magnetizing component 3 includes at least one magnetizing sheet 31 ; when the magnetizing component 3 includes multiple magnetizing sheets 31 , the multiple magnetizing sheets 31 are stacked in a direction away from the arc-starting portion 22 .

[0077] Embodiment 3

[0078] Reference Figure 7The magnetizing component 3 includes at least one independent arc-increasing unit, and each arc-increasing unit includes at least one magnetizing sheet 31; when the magnetizing component 3 includes multiple arc-increasing units, the multiple arc-increasing units are arranged in sequence along the extension path of the arc-starting portion 22; when the arc-increasing unit includes multiple magnetizing sheets 31, the multiple magnetizing sheets 31 are stacked in a direction away from the arc-starting portion 22.

[0079] Embodiment 4

[0080] Reference Figure 8 and Fig. 9 The magnetizing component 3 includes a first part and a second part which are integrally formed or independent of each other, the first part and the second part are arranged in a V shape, and the first part and the second part are respectively arranged on the first arc-starting segment 221 and the second arc-starting segment 222.

[0081] Optionally, both the first part and the second part may be a flat plate structure or a U-shaped structure.

[0082] Specific reference Figure 8 In the embodiment where the first part and the second part are integrally formed, the magnetizing member 3 can be formed into the first part and the second part by a bending process.

[0083] Specific reference Fig. 9 In an embodiment where the first part and the second part are independent of each other, the first part and the second part each include at least one independent arc starting unit.

[0084] Embodiment 5

[0085] Reference Fig.10 In this embodiment, the magnetic field strength applied by the magnetizing member 3 to the extension path of the extension portion 22 tends to increase along the direction approaching the grid plate group 1 .

[0086] Fig.10 The dotted line in the figure represents the arc. Since the magnetic field strength applied by the magnetizing member 3 to the extension path of the extension portion 22 increases in the direction close to the grid group 1, that is, the magnetic field strength applied by the magnetizing member 3 to the extension path of the extension portion 22 increases in the direction of the arrow in the figure, it is more conducive to pulling the moving arc root toward the top of the arc extinguishing chamber in the obliquely upward direction, so as to fully utilize the arc extinguishing grid above the arc extinguishing chamber. Reasonable setting of the change in the magnetic field strength at the extension path of the extension portion 22 can fully utilize the arc extinguishing grid above the arc extinguishing chamber, thereby maximizing the arc extinguishing ability of the arc extinguishing chamber.

[0087] In this embodiment, the magnetizing component 3 includes a plurality of independent arc-increasing units, which are arranged in sequence along the extension path of the arc-starting portion 22 ; along the direction approaching the grid group 1 , the magnetic field strength of the plurality of arc-increasing units increases.

[0088] In the above structure, each arc-enhancing unit includes at least one magnetizing sheet 31; the number of magnetizing sheets 31 in the plurality of magnetizing members 3 increases along the direction approaching the grid sheet group 1. Through the above structure, the magnetic field intensity applied by the magnetizing member 3 to the extension path of the extension portion 22 increases along the direction approaching the grid sheet group 1.

[0089] Specifically, the cross section of the magnetizing member 3 is U-shaped, and includes at least one magnetizing sheet 31 with a U-shaped cross section. When the magnetic field strength increases in the direction close to the grid sheet group 1, it can be a superposition of magnetizing sheets 31 with a U-shaped structure, or a superposition of magnetizing sheets 31 with a U-shaped structure and magnetizing sheets 31 with a flat structure.

[0090] Embodiment 6

[0091] Reference Fig.11 In this embodiment, the magnetizing component 3 is arranged on the first arc-starting segment 221 or the second arc-starting segment 222. The magnetizing component 3 is a flat plate structure, and the magnetizing component 3 covers the surface of the first arc-starting segment 221 or the second arc-starting segment 222 away from the grid group 1.

[0092] It is understandable that the magnetizing component 3 can be further expanded and transformed based on the above structure, which will not be listed here one by one.

[0093] Another aspect of the present application provides a circuit breaker, the circuit breaker comprising any of the above arc extinguishing chambers. Therefore, the circuit breaker has at least the technical effects of any of the above arc extinguishing chambers, which will not be described in detail here.

[0094] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. An arc extinguishing chamber for a circuit breaker, the circuit breaker comprising a moving contact (100) and a stationary contact (200), characterized in that: The arc extinguishing chamber comprises a grid plate group (1), a moving arc-starting plate (2) and a magnetizing component (3); The moving contact (100) has a movable end for contacting or separating with the stationary contact (200); the moving arc-starting plate (2) comprises a connected fixing portion (21) and an extending portion (22), wherein: the fixing portion (21) is arranged on the top of the grid plate group (1), and the extending portion (22) extends from the fixing portion (21) to the movable end of the moving contact (100) in a separated state; The magnetizing member (3) is arranged on an extension path of the extension portion (22).

2. The arc extinguishing chamber according to claim 1, characterized in that: It also comprises two arc extinguishing chamber side walls (4) arranged on opposite sides of the grid plate group (1), and the magnetizing component (3) is arranged between the two arc extinguishing chamber side walls (4).

3. The arc extinguishing chamber according to claim 2, characterized in that: The magnetizing component (3) is connected to one or more of the moving arc-striking plate (2), the arc-extinguishing chamber side wall (4) and the housing of the circuit breaker.

4. The arc extinguishing chamber according to claim 1, characterized in that: The magnetizing component (3) is snap-fitted, welded, or threadedly connected to the moving arc-starting plate (2).

5. The arc extinguishing chamber according to claim 1, characterized in that: The extending portion (22) comprises a first arc-strike segment (221) and a second arc-strike segment (222), wherein: the first arc-strike segment (221) is arranged to be tilted downward from the fixed portion (21) to the movable end of the moving contact (100) in a separated state; and the second arc-strike segment (222) is arranged to be tilted upward from the first arc-strike segment (221) to the top of the movable end of the moving contact (100) in a separated state; Alternatively, the extension portion (22) is arranged to be inclined downward from the fixed portion (21) to the movable end of the moving contact (100) in the separated state, and one end of the extension portion (22) away from the fixed portion (21) corresponds to the top of the movable end of the moving contact (100) in the separated state.

6. The arc extinguishing chamber according to claim 5, characterized in that: The extension portion (22) comprises the first arc-starting section (221) and the second arc-starting section (222); the magnetizing component (3) is arranged on an extension path of the first arc-starting section (221) or the second arc-starting section (222); Alternatively, the extension portion (22) includes the first arc-starting segment (221) and the second arc-starting segment (222); the magnetizing component (3) includes a first portion and a second portion that are integrally formed or independent of each other, the first portion and the second portion are arranged in a V-shape, and the first portion and the second portion are respectively arranged on the extension path of the first arc-starting segment (221) and the extension path of the second arc-starting segment (222).

7. The arc extinguishing chamber according to claim 1, characterized in that: The magnetizing component (3) is a plate-shaped structure, and the magnetizing component (3) is arranged on a surface of the extension portion (22) away from the grid plate group (1); Alternatively, the cross section of the magnetizing component (3) is U-shaped, at least part of the extension portion (22) is located inside the magnetizing component (3), and the opening side of the magnetizing component (3) faces the grid plate group (1).

8. The arc extinguishing chamber according to claim 1, characterized in that: The magnetizing component (3) comprises at least one magnetizing sheet (31); when the magnetizing component (3) comprises a plurality of magnetizing sheets (31), the plurality of magnetizing sheets (31) are stacked in a direction away from the extending portion (22); Alternatively, the magnetizing component (3) includes at least one independent arc-enhancing unit, and each of the arc-enhancing units includes at least one magnetizing sheet (31); when the magnetizing component (3) includes a plurality of the arc-enhancing units, the plurality of the arc-enhancing units are arranged in sequence along the extension path of the extension portion (22); when the arc-enhancing unit includes a plurality of the magnetizing sheets (31), the plurality of the magnetizing sheets (31) are stacked in a direction away from the extension portion (22).

9. The arc extinguishing chamber according to claim 1, characterized in that: The intensity of the magnetic field applied by the magnetizing member (3) to the extension path of the extension portion (22) tends to increase in a direction approaching the grid plate group (1).

10. A circuit breaker, characterized in that: Comprising the arc extinguishing chamber according to any one of claims 1 to 9.

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