A double-break circuit breaker

Abstract

This application relates to the field of electrical connection device technology, and more particularly to a double-break circuit breaker. The double-break circuit breaker provided by this application includes a housing and a contact system and an arc-extinguishing system located within the housing. The arc-extinguishing system includes a first sub-arc-extinguishing structure, a second sub-arc-extinguishing structure, and a partition. The first sub-arc-extinguishing structure is used to extinguish the arc generated when the first stationary contact separates from the first moving contact, and the second sub-arc-extinguishing structure is used to extinguish the arc generated when the second stationary contact separates from the second moving contact. The partition extends from the arc-initiating zone to the arc-extinguishing zone, providing electrical isolation between the first and second sub-arc-extinguishing structures in the arc-initiating and arc-extinguishing zones. Thus, during the arc-extinguishing process, the arc generated by the first contact group and the second contact group is less likely to cross-contact. The first sub-arc-extinguishing structure is only used to extinguish the arc generated by the first contact group, and the second sub-arc-extinguishing structure is only used to extinguish the arc generated by the second contact group, which helps to improve arc-extinguishing efficiency.

Description

Technical Field

[0001] This application relates to the field of electrical connection device technology, and more particularly to a double-break circuit breaker. Background Technology

[0002] In modern power systems, circuit breakers are core equipment for ensuring the safe and stable operation of power, and their importance cannot be underestimated. They not only undertake the task of connecting and disconnecting normal circuits, but also quickly cut off the current when a fault occurs, preventing the accident from escalating, and can be called the "safety guardian" of the power system.

[0003] With the increase in rated operating voltage of circuit breakers, conventional circuit breakers can no longer meet the growing performance requirements. Therefore, people have begun to consider using double-break circuit breakers to improve their load-bearing capacity.

[0004] When a double-break circuit breaker is tripped, an electric arc will be generated at both break points. Traditional arc extinguishing structures are difficult to meet the arc extinguishing requirements of double-break circuit breakers. Utility Model Content

[0005] This application provides a double-break circuit breaker that can solve the technical problem of insufficient arc extinguishing capability of traditional arc extinguishing structures.

[0006] The technical solution of this application is as follows:

[0007] The double-break circuit breaker provided in this application includes a housing and a contact system and an arc-extinguishing system located within the housing.

[0008] The contact system includes a first contact group and a second contact group. The first contact group includes a first stationary contact and a first moving contact that can be separated and connected, and the second contact group includes a second stationary contact and a second moving contact that can be separated and connected. Along a first direction, the first stationary contact and the second stationary contact are arranged side-by-side, and the first moving contact and the second moving contact are arranged side-by-side. When the double-break circuit breaker is closed, the first contact group and the second contact group are connected in series.

[0009] The arc extinguishing system includes a first sub-arc extinguishing structure, a second sub-arc extinguishing structure, and a partition. Along a first direction, the partition is disposed between the first contact group and the second contact group. The first and second sub-arc extinguishing structures are arranged side-by-side on both sides of the partition, with the first sub-arc extinguishing structure corresponding to the first contact group and used to extinguish the arc generated when the first contact group breaks down. The second sub-arc extinguishing structure corresponds to the second contact group and is used to extinguish the arc generated when the first contact group breaks down.

[0010] Along the second direction, the arc-extinguishing system includes an arc-initiating zone and an arc-extinguishing zone. The arc-initiating zone corresponds to the area where the first contact group and the second contact group are located. An electric arc is generated in the arc-initiating zone and extinguished in the arc-extinguishing zone. A partition extends from the arc-initiating zone to the arc-extinguishing zone, serving as electrical isolation between the first sub-arc-extinguishing structure and the second sub-arc-extinguishing structure in the arc-initiating zone and the arc-extinguishing zone. The first direction is perpendicular to the second direction.

[0011] Based on the double-break circuit breaker provided in this application, the double-break circuit breaker includes a first sub-arc extinguishing structure, a second sub-arc extinguishing structure, and a partition. The first sub-arc extinguishing structure is used to extinguish the arc generated when the first stationary contact separates from the first moving contact, and the second sub-arc extinguishing structure is used to extinguish the arc generated when the second stationary contact separates from the second moving contact. Along a second direction, the arc extinguishing system includes an arc-initiating zone and an arc-extinguishing zone. The arc-initiating zone corresponds to the area where the first contact group and the second contact group are located. The arc is generated in the arc-initiating zone and extinguished in the arc-extinguishing zone. The partition extends from the arc-initiating zone to the arc-extinguishing zone, providing electrical isolation between the first sub-arc extinguishing structure and the second sub-arc extinguishing structure in the arc-initiating zone and the arc-extinguishing zone. In this way, during the arc extinguishing process, the arc generated by the first contact group and the second contact group is less likely to cross-contact. The first sub-arc extinguishing structure is only used to extinguish the arc generated by the first contact group, and the second sub-arc extinguishing structure is only used to extinguish the arc generated by the second contact group, which helps to improve the arc extinguishing efficiency.

[0012] In one possible design, in the arc-initiating zone, the first and second sub-arc-extinguishing structures each include two sets of arc-isolating plate assemblies. Each set of arc-isolating plate assemblies includes a plastic arc-isolating plate and a soft magnetic plate. Under the influence of the electric arc, the plastic arc-isolating plate can generate arc-extinguishing gas. The soft magnetic plate can be magnetized under the influence of the electric arc.

[0013] Along the first direction, the two plastic arc-extinguishing plates in the first sub-arc extinguishing structure are disposed on opposite sides of the first contact group, and the two soft magnetic plates in the first sub-arc extinguishing structure are respectively disposed on the side of the two plastic arc-extinguishing plates in the first sub-arc extinguishing structure that are far away from each other.

[0014] Along the first direction, the two plastic arc-extinguishing plates in the second sub-arc extinguishing structure are disposed on opposite sides of the second contact group, and the two soft magnetic plates in the second sub-arc extinguishing structure are respectively disposed on the side of the two plastic arc-extinguishing plates in the second sub-arc extinguishing structure that are far away from each other.

[0015] Based on the dual-break circuit breaker provided by this embodiment, in the arc-initiating zone, the first sub-arc extinguishing structure and the second sub-arc extinguishing structure each include two sets of arc-isolating plate groups. Along the first direction, a first independent space is formed between the two sets of arc-isolating plate groups of the first sub-arc extinguishing structure, and the first contact group is located in this space. Similarly, a second independent space is formed between the two sets of arc-isolating plate groups of the second sub-arc extinguishing structure, and the second contact group is located in this space. Thus, along the first direction, the first sub-arc extinguishing structure and the second sub-arc extinguishing structure can confine the arc generated when the first contact group and the second contact group are segmented into independent spaces, preventing the arc from escaping along the first direction and reducing the difficulty of arc extinguishing.

[0016] In addition, the arc-blocking plate groups on both sides of each contact group are composed of a plastic arc-blocking plate and a soft magnetic plate, respectively. After the arc is generated, the arc-blocking plate group can play the role of air blowing and magnetic blowing of the arc, accelerate the movement of the arc towards the arc-extinguishing zone, reduce the arc energy, and thus help the arc to be extinguished.

[0017] In one possible design, a first mounting groove is provided on one side of the plastic arc-blocking plate, and a first reinforcing rib is provided on the circumferential wall of the first mounting groove. The soft magnetic plate is interference-fitted with the first mounting groove through the first reinforcing rib.

[0018] Based on the dual-break circuit breaker provided in this embodiment, one side of the plastic arc-isolating plate has a first mounting groove, and the soft magnetic plate is fixed in the first mounting groove. Thus, during the assembly of the dual-break circuit breaker, the arc-isolating plate assembly can be assembled as a whole, which helps improve assembly efficiency. Furthermore, the circumferential wall of the first mounting groove is provided with a first reinforcing rib, and the soft magnetic plate is interference-fitted with the first mounting groove through the first reinforcing rib. This simplifies the combination of the plastic arc-isolating plate and the soft magnetic plate.

[0019] In one possible design, in the arc-extinguishing zone, both the first and second sub-arc-extinguishing structures include an arc-extinguishing chamber. The two arc-extinguishing chambers are arranged side-by-side on both sides of the partition along a first direction. The inlet of the arc-extinguishing chamber of the first sub-arc-extinguishing structure faces the first contact group and is used to extinguish the arc generated by the first contact group. The inlet of the arc-extinguishing chamber of the second sub-arc-extinguishing structure faces the second contact group and is used to extinguish the arc generated by the second contact group.

[0020] Along the first direction, a magnetic shield is also provided between the partition and one of the two arc-extinguishing chambers. The magnetic shield is used to prevent magnetic interference between the two arc-extinguishing chambers.

[0021] Based on the dual-break circuit breaker provided in this embodiment, one arc-extinguishing chamber in the arc-extinguishing zone is used to extinguish the arc generated when the first contact group breaks, and the other arc-extinguishing chamber is used to extinguish the arc generated when the second contact group breaks. A partition is located between the two arc-extinguishing chambers to prevent arc crossing between them and improve the arc-extinguishing effect. Furthermore, during the arc-extinguishing process, the arc vibrates violently under the cutting action of the arc-extinguishing grid, generating a strong interfering magnetic field. A magnetic shield is also installed between the partition and one of the two arc-extinguishing chambers. The magnetic shield's magnetic isolation function can isolate electromagnetic interference between the two arc-extinguishing chambers, thereby contributing to the extinguishing of the arc.

[0022] In one possible design, along a third direction, the arc-extinguishing chamber includes a plurality of alternating first arc-extinguishing grids and second arc-extinguishing grids.

[0023] Along the second direction, the first arc-extinguishing grid includes a first slot with its opening facing the arc-initiating area, and the second arc-extinguishing grid includes a second slot with its opening facing the arc-initiating area. The bottoms of the plurality of first slots are aligned, the bottoms of the plurality of second slots are aligned, and the bottoms of the first slots and the second slots are staggered. The first direction, the second direction, and the third direction are perpendicular to each other.

[0024] Based on the dual-break circuit breaker provided in this embodiment, multiple first slots can form a set of blades for cutting the electric arc, and multiple second slots can form another set of blades for cutting the electric arc. The electric arc from the arc initiation zone is first cut by the first set of blades to form a shorter arc, and then cut by the second set of blades to form an even shorter arc. In practice, it has been found that the staggered arrangement of the first and second slots has a better arc-cutting effect.

[0025] In one possible design, in the arc-initiating area, along the first direction, a second mounting groove is provided on one side of the partition, and a third mounting groove is provided on the other side of the partition.

[0026] A set of arc-blocking plates of the first arc-extinguishing structure is fixed at the second mounting slot.

[0027] The second arc-extinguishing structure consists of a set of arc-blocking plates fixed at the third mounting slot.

[0028] In the arc-extinguishing zone, along the first direction, a fourth mounting groove is provided on one side of the partition, and a fifth mounting groove is provided on the other side of the partition. The magnetic shielding component is fixed at the fourth mounting groove, and the arc-extinguishing chamber of the first sub-arc-extinguishing structure is positioned near the partition by the circumferential wall of the fourth mounting groove. The arc-extinguishing chamber of the second sub-arc-extinguishing structure is positioned near the partition by the circumferential wall of the fifth mounting groove, and the bottom of the fifth mounting groove is provided with multiple first positioning strips, which are used to position the arc-extinguishing grid plates of the second sub-arc-extinguishing structure.

[0029] Based on the dual-break circuit breaker provided by this embodiment, the partition integrates multiple functions. The partition not only serves as electrical isolation between the first and second sub-arc extinguishing structures, but also for the fixed installation of the two sets of arc-isolating plates and magnetic shielding components, and for the positioning of the arc-extinguishing grid plates of the two arc-extinguishing chambers and the second sub-arc extinguishing structure. This facilitates the simplification of the overall structure of the dual-break circuit breaker.

[0030] In one possible design, the magnetic shielding component includes an insulating plate and a shielding plate.

[0031] Along the first direction, the insulating plate is embedded in the fourth mounting groove and is interference-fitted with the fourth mounting groove.

[0032] A sixth mounting groove is provided on the side of the insulating plate near the partition, and the shielding plate is interference-fitted with the sixth mounting groove. Multiple second positioning strips are provided on the other side of the insulating plate; these second positioning strips are used to position the arc-extinguishing grid plates of the first sub-arc-extinguishing structure.

[0033] Based on the dual-break circuit breaker provided by this embodiment, the magnetic shielding component can not only be installed through a partition and has the function of magnetic shielding, but also play a positioning role for the arc-extinguishing grid plate of the first sub-arc extinguishing structure. The overall structure is ingeniously designed, simple to assemble, and highly integrated.

[0034] In one possible design, along the second direction, a plurality of first anti-arc-crossing baffles are also provided on the side of the fourth mounting slot away from the second mounting slot. Along the first direction, the first anti-arc-crossing baffles extend from the partition to the outlet of the arc-extinguishing chamber of the first sub-arc-extinguishing structure. Along the third direction, the plurality of anti-arc-crossing baffles are arranged sequentially, with a gap between adjacent first anti-arc-crossing baffles.

[0035] On the side of the fifth mounting slot furthest from the third mounting slot, multiple second anti-arc strips are also provided. Along the first direction, the second anti-arc strips extend from the partition to the outlet of the arc-extinguishing chamber of the second sub-arc extinguishing structure. Along the third direction, multiple second anti-arc strips are arranged sequentially, with gaps between adjacent second anti-arc strips.

[0036] Based on the dual-break circuit breaker provided in this embodiment, the fourth mounting slot is further provided with a plurality of first anti-arc stripping baffles arranged along a third direction on the side away from the second mounting slot, and the fifth mounting slot is further provided with a plurality of second anti-arc stripping baffles arranged along a third direction on the side away from the second mounting slot. In this way, the arc can be further cut by the plurality of first anti-arc stripping baffles and second anti-arc stripping baffles, preventing short arcs from reconnecting and becoming long arcs at the outlet of the arc extinguishing chamber, thus ensuring the arc extinguishing effect.

[0037] In one possible design, along the second direction, the arc extinguishing system also includes a pressure relief zone located on the side of the arc extinguishing zone away from the arc initiation zone.

[0038] Along the second direction, the housing includes a first part and a second part that interlock, and the arc extinguishing system and the contact system are both located in the cavity formed by the first part and the second part.

[0039] Along the second direction, in the pressure relief zone, the baffle and the first part form a pressure relief channel for the first sub-arc extinguishing structure. The baffle and the second part form a pressure relief channel for the second sub-arc extinguishing structure.

[0040] Along the direction of gas flow, the pressure relief channels of the first sub-arc extinguishing structure and / or the second sub-arc extinguishing structure become wider.

[0041] Based on the dual-break circuit breaker provided in this embodiment, the design of the pressure relief channel is based on the principle of aerodynamics: the smaller the space, the higher the gas pressure; the larger the space, the lower the gas pressure. In this application, the pressure relief channel widens along the direction of gas flow, so that the gas moves from high pressure to low pressure, and the high-temperature gas mass generated by the electric arc can be quickly discharged.

[0042] In one possible design, along a first direction, the first part is located on the side of the first sub-arc extinguishing structure away from the second sub-arc extinguishing structure, and the second part is located on the side of the second sub-arc extinguishing structure away from the first sub-arc extinguishing structure.

[0043] The first part is also provided with a first positioning structure for installing the first sub-arc extinguishing structure on the side near the first sub-arc extinguishing structure. The side of the first sub-arc extinguishing structure near the first part is positioned by the first positioning structure.

[0044] The second part is also provided with a second positioning structure for installing the second sub-arc extinguishing structure on the side near the second sub-arc extinguishing structure. The side of the second sub-arc extinguishing structure near the second part is positioned by the second positioning structure.

[0045] Based on the dual-break circuit breaker provided by this embodiment, a first positioning structure for installing the first sub-arc extinguishing structure is provided on the side of the first part close to the first sub-arc extinguishing structure, and a second positioning structure for installing the second sub-arc extinguishing structure is provided on the side of the second part close to the second sub-arc extinguishing structure. This facilitates the accurate installation of the first sub-arc extinguishing structure and the second sub-arc extinguishing structure. Attached Figure Description

[0046] Figure 1 The diagram shown is a schematic diagram of the internal structure of a double-break circuit breaker provided in this application.

[0047] Figure 2 The diagram shown is a structural schematic of an arc extinguishing system provided in an embodiment of this application.

[0048] Figure 3 for Figure 2 Exploded view.

[0049] Figure 4 for Figure 3 An exploded view of a group of arc-blocking plates.

[0050] Figure 5 This is a schematic diagram of the structure of an arc-extinguishing chamber provided in an embodiment of this application.

[0051] Figure 6 for Figure 5 The exploded view of the arc-extinguishing chamber is shown.

[0052] Figure 7 for Figure 3 Axonometric view of the central diaphragm.

[0053] Figure 8 for Figure 7 A side view.

[0054] Figure 9 for Figure 7 Another side view.

[0055] Figure 10 This is an isometric view of a magnetic shielding component provided in an embodiment of this application.

[0056] Figure 11 for Figure 10 Exploded view.

[0057] Figure 12 This is a schematic diagram of the structure of the first part provided in the embodiments of this application.

[0058] Figure 13 This is a schematic diagram of the structure of the second part provided in the embodiments of this application.

[0059] The attached figures are labeled as follows:

[0060] 1. Housing; 11. First part; 111. First positioning structure; 1111. Third positioning strip; 1112. Positioning groove; 1113. Positioning protrusion; 12. Second part; 121. Second positioning structure; 1211. Fourth positioning strip;

[0061] 2. Contact system; 21. First contact group; 211. First stationary contact; 212. First moving contact; 22. Second contact group; 221. Second stationary contact; 222. Second moving contact; 23. First stationary contact plate; 24. Second stationary contact plate; 25. Moving contact;

[0062] 3. Arc extinguishing system;

[0063] 31. First sub-arc extinguishing structure; 32. Second sub-arc extinguishing structure; 3A. Arc isolation plate assembly; 3A1. Plastic arc isolation plate; 3A11. First mounting groove; 3A12. First reinforcing rib; 3A13. Round hole; 3A14. Positioning groove; 3A2. Soft magnetic plate; 3AA. First independent space; 3AB. Second independent space;

[0064] 3B, Arc-extinguishing chamber; 3B1, First arc-extinguishing grid plate; 3B11, First slot; 3B2, Second arc-extinguishing grid plate; 3B21, Second slot;

[0065] 3C, Magnetic shielding component; 3C1, Insulating plate; 3C11, Sixth mounting slot; 3C12, Second positioning strip; 3C13, Anti-fooling block; 3C2, Shielding plate;

[0066] 33. Partition; 331. Second mounting groove; 332. Third mounting groove; 33A. Cylindrical positioning block; 33B. Second reinforcing rib; 333. Fourth mounting groove; 3331. First anti-arc baffle; 334. Fifth mounting groove; 3341. First positioning strip; 3342. Second anti-arc baffle;

[0067] 3L, arc initiation zone; 3M, arc extinguishing zone; 3N, pressure relief zone; 3N1, pressure relief channel. Detailed Implementation

[0068] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0069] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The terms “comprising” and “having”, and any variations thereof, in the specification, claims, and drawings of this application are intended to cover non-exclusive inclusion.

[0070] The term "embodiment" as used herein means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of the phrase "embodiment" in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0071] In this article, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists, A and B exist simultaneously, or B exists. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0072] Furthermore, the terms "first," "second," etc., in the specification and claims of this application or in the aforementioned drawings are used to distinguish different objects rather than to describe a specific order, and may explicitly or implicitly include one or more of the features.

[0073] In the description of this application, unless otherwise stated, "multiple" means two or more (including two), and similarly, "multiple groups" means two or more (including two groups).

[0074] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, "connection" or "joining" in mechanical structures can refer to a physical connection. A physical connection can be a fixed connection, such as a connection secured by spacers, screws, bolts, or other spacers. A physical connection can also be a detachable connection, such as a snap-fit ​​or interlocking connection. A physical connection can also be an integral connection, such as a connection formed by welding, bonding, or integral molding. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0075] The present application will be described in detail below with reference to the accompanying drawings.

[0076] Figure 1 The diagram shown is a schematic representation of the internal structure of a double-break circuit breaker according to an embodiment of this application. Figure 2 The figure shown is a schematic diagram of an arc extinguishing system provided in an embodiment of this application. Figure 3 for Figure 2 Exploded view.

[0077] Please refer to Figures 1 to 3 The double-break circuit breaker provided in this application includes a housing 1 and a contact system 2 and an arc extinguishing system 3 located within the housing 1.

[0078] The contact system 2 includes a first contact group 21 and a second contact group 22. The first contact group 21 includes a detachable first stationary contact 211 and a first moving contact 212, and the second contact group 22 includes a detachable second stationary contact 221 and a second moving contact 222. Along the first direction D1, the first stationary contact 211 and the second stationary contact 221 are arranged side by side, and the first moving contact 212 and the second moving contact 222 are arranged side by side. When the double-break circuit breaker is closed, the first contact group 21 and the second contact group 22 are connected in series.

[0079] The arc extinguishing system 3 includes a first sub-arc extinguishing structure 31, a second sub-arc extinguishing structure 32, and a partition 33. Along the first direction D1, the partition 33 is disposed between the first contact group 21 and the second contact group 22. The first sub-arc extinguishing structure 31 and the second sub-arc extinguishing structure 32 are arranged side by side on both sides of the partition 33. The first sub-arc extinguishing structure 31 is disposed corresponding to the first contact group 21 and is used to extinguish the arc generated when the first contact group 21 is broken. The second sub-arc extinguishing structure 32 is disposed corresponding to the second contact group 22 and is used to extinguish the arc generated when the first contact group 21 is broken.

[0080] Along the second direction D2, the arc extinguishing system 3 includes an arc-initiating zone 3L and an arc-extinguishing zone 3M. The arc-initiating zone 3L corresponds to the area where the first contact group 21 and the second contact group 22 are located. The arc is generated in the arc-initiating zone 3L and extinguished in the arc-extinguishing zone 3M. The partition 33 extends from the arc-initiating zone 3L to the arc-extinguishing zone 3M, and is used for electrical isolation between the first sub-arc extinguishing structure 31 and the second sub-arc extinguishing structure 32 in the arc-initiating zone 3L and the arc-extinguishing zone 3M. The first direction D1 is perpendicular to the second direction D2.

[0081] For details, please refer to Figure 3 In one embodiment of this application, the contact system 2 includes a first stationary contact plate 23, a second stationary contact plate 24, and a moving contact 25. The first stationary contact plate 23 is provided with a first stationary contact point 211, and the second stationary contact plate 24 is provided with a second stationary contact point 221. Along a first direction D1, the first stationary contact point 211 and the second stationary contact point 221 are arranged side-by-side. Along a second direction D2, the moving contact 25 is disposed on one side of the first stationary contact point 211 and the second stationary contact point 221. The moving contact 25 is U-shaped and includes an integrally formed first moving contact... The device includes a contact arm 251, a second movable contact arm 252, and a connecting portion 253 connecting the first movable contact arm 251 and the second movable contact arm 252. The first movable contact arm 251 is provided with a first movable contact 212 opposite to the first stationary contact 211, and the second movable contact arm 252 is provided with a second movable contact 222 opposite to the second stationary contact 221. The first movable contact 212 and the first stationary contact 211 form a detachable first contact group 21, and the second movable contact 222 and the second stationary contact 221 form a detachable second contact group 22.

[0082] When the double-break circuit breaker closes, the first moving contact 212 contacts the first stationary contact 211, and the second moving contact 222 contacts the second stationary contact 221. Current flows in from the first stationary contact plate 23, and then sequentially through the first stationary contact 211, the moving contact 25, and the second stationary contact 221. When opening, the first moving contact 212 separates from the first stationary contact 211, and the second moving contact 222 separates from the second stationary contact 221. Compared to a traditional single-break circuit breaker, the double-break circuit breaker has two series-connected first contact groups 21 and second contact groups 22. The two series-connected contact groups can act as voltage dividers, and the energy carried by each contact group is reduced when it separates, thereby improving the breaking performance of the circuit breaker.

[0083] Please refer to Figures 1 to 3 When the double-break circuit breaker is tripped, the first stationary contact 211 separates from the first moving contact 212, and the second stationary contact 221 separates from the second moving contact 222. During the separation process, an electric arc will be generated between the first stationary contact 211 and the first moving contact 212, and between the second stationary contact 221 and the second moving contact 222.

[0084] Generally speaking, during arc extinguishing, the longer the arc, the more difficult it is to extinguish; the shorter the arc, the easier it is to extinguish. The dual-break circuit breaker provided in this application includes a first sub-arc extinguishing structure 31, a second sub-arc extinguishing structure 32, and a partition 33. The first sub-arc extinguishing structure 31 is used to extinguish the arc generated when the first stationary contact 211 separates from the first moving contact 212, and the second sub-arc extinguishing structure 32 is used to extinguish the arc generated when the second stationary contact 221 separates from the second moving contact 222. Figure 1 The area indicated by the first dashed box on the right contains the arc-initiating zone 3L, and the area indicated by the second dashed box on the right contains the arc-extinguishing zone 3M. The partition 33 extends from the arc-initiating zone 3L to the arc-extinguishing zone 3M, providing electrical isolation between the first sub-arc-extinguishing structure 31 and the second sub-arc-extinguishing structure 32 in the arc-initiating zone 3L and the arc-extinguishing zone 3M. Thus, during the arc-extinguishing process, the arc generated by the first contact group 21 and the second contact group 22 is less likely to cross-contact. The first sub-arc-extinguishing structure 31 is only used to extinguish the arc generated by the first contact group 21, and the second sub-arc-extinguishing structure 32 is only used to extinguish the arc generated by the second contact group 22, which helps improve arc-extinguishing efficiency.

[0085] Figure 4 for Figure 3 Please refer to the exploded view of the arc-damping plate group 3A. Figures 1 to 4 In some embodiments of this application, in the arc-initiating region 3L, the first sub-arc-extinguishing structure 31 and the second sub-arc-extinguishing structure 32 each include two sets of arc-isolating plate groups 3A. Each set of arc-isolating plate groups 3A includes a plastic arc-isolating plate 3A1 and a soft magnetic plate 3A2. Under the action of the electric arc, the plastic arc-isolating plate 3A1 can generate arc-extinguishing gas. The soft magnetic plate 3A2 can be magnetized under the action of the electric arc.

[0086] Along the first direction D1, the two plastic arc-extinguishing plates 3A1 in the first sub-arc extinguishing structure 31 are disposed on opposite sides of the first contact group 21, and the two soft magnetic plates 3A2 in the first sub-arc extinguishing structure 31 are respectively disposed on the side of the two plastic arc-extinguishing plates 3A1 in the first sub-arc extinguishing structure 31 that are far away from each other.

[0087] Along the first direction D1, the two plastic arc-extinguishing plates 3A1 in the second sub-arc extinguishing structure 32 are disposed on opposite sides of the second contact group 22, and the two soft magnetic plates 3A2 in the second sub-arc extinguishing structure 32 are respectively disposed on the side of the two plastic arc-extinguishing plates 3A1 in the second sub-arc extinguishing structure 32 that are far away from each other.

[0088] Specifically, in this embodiment, the main functions of the arc-initiating zone 3L are as follows: First, it limits the flow area of ​​the arc generated by the first contact group 21 and the second contact group 22 when the double-break circuit breaker is tripped. Second, it causes the arc generated by the first contact group 21 and the second contact group 22 to move towards the arc-extinguishing zone 3M, thereby accelerating the arc extinguishing.

[0089] Specifically, in the arc initiation zone 3L, the first sub-arc extinguishing structure 31 and the second sub-arc extinguishing structure 32 each include two sets of arc-blocking plate groups 3A. Combined with... Figure 2 and Figure 3 Along the first direction D1, a first independent space 3AA is formed between the two sets of arc-blocking plate groups 3A of the first sub-arc extinguishing structure 31, in which the first contact group 21 is located. A second independent space 3AB is formed between the two sets of arc-blocking plate groups 3A of the second sub-arc extinguishing structure 32, in which the second contact group 22 is located. Thus, along the first direction D1, the first sub-arc extinguishing structure 31 and the second sub-arc extinguishing structure 32 can confine the arc generated when the first contact group 21 and the second contact group 22 are segmented into separate independent spaces, preventing the arc from escaping along the first direction D1, reducing the difficulty of arc extinguishing, and also preventing the arc from burning other components inside the double-break circuit breaker.

[0090] Please continue to refer to this. Figure 3 and Figure 4 Each arc-isolating plate group 3A in the first sub-arc extinguishing structure 31 and the second sub-arc extinguishing structure 32 includes a plastic arc-isolating plate 3A1 and a soft magnetic plate 3A2. Taking the first sub-arc extinguishing structure 31 as an example, the two plastic arc-isolating plates 3A1 in the two arc-isolating plate groups 3A are located on opposite sides of the first contact group 21, serving as arc-isolating and air-blowing functions. The two soft magnetic plates 3A2 in the two arc-isolating plate groups 3A are located on the side of the two plastic arc-isolating plates 3A1 that are far apart from each other, serving as magnetic blowing functions.

[0091] The principle of air blowing is as follows: the separation of the first moving contact 212 and the first stationary contact 211 of the first contact group 21 generates a high-temperature electric arc. This high-temperature arc heats the plastic arc-blocking plate 3A1, causing it to generate gas with a high thermal conductivity. This increases the gas pressure in the arc-initiating zone 3L, and the high-pressure gas pushes the arc towards the arc-extinguishing zone 3M, accelerating arc extinguishing. Furthermore, the high-pressure gas can rapidly reduce the arc energy, promoting arc extinction. The plastic arc-blocking plate 3A1 has electrical insulating properties and is generally made of materials such as plexiglass, polyoxymethylene (POM), and nylon.

[0092] The principle of magnetic blowout is as follows: the first moving contact 212 of the first contact group 21 separates from the first stationary contact 211 to generate an electric arc. The electric arc magnetizes the soft magnetic plate 3A2, generating a magnetic field between the two soft magnetic plates 3A2. The magnetic field acts on the electric arc through the Lorentz force, blowing the arc towards the arc extinguishing zone 3M, thereby accelerating the arc extinguishing. The soft magnetic plate 3A2 can be made of soft magnetic materials, such as ferrite, nickel-iron alloy, etc.

[0093] The working principle of the second arc-extinguishing structure 32 in the arc-starting region 3L is similar to that of the first arc-extinguishing structure 31, and will not be repeated here.

[0094] As can be seen from the above, the dual-break circuit breaker provided by this embodiment has four sets of arc-isolating plate groups 3A in the arc-initiating zone 3L. The four sets of arc-isolating plate groups 3A isolate the two contact groups in separate spaces to prevent the arc from escaping along the first direction D1 and reduce the difficulty of arc extinguishing. In addition, the arc-isolating plate groups 3A on both sides of each contact group are composed of a plastic arc-isolating plate 3A1 and a soft magnetic plate 3A2, respectively. After the arc is generated, the arc-isolating plate groups 3A can play a role in blowing the arc with air and magnetic force, accelerating the arc to move towards the arc-extinguishing zone 3M, reducing the arc energy, and thus helping to extinguish the arc.

[0095] Please continue to refer to this. Figure 4 In some embodiments of this application, a first mounting groove 3A11 is provided on one side of the plastic arc-blocking plate 3A1, and a first reinforcing rib 3A12 is provided on the circumferential groove wall of the first mounting groove 3A11. The soft magnetic plate 3A2 is interference-fitted with the first mounting groove 3A11 through the first reinforcing rib 3A12.

[0096] Specifically, in this embodiment, the plastic arc-blocking plate 3A1 has a first mounting groove 3A11 on one side, and the soft magnetic plate 3A2 is fixed at the first mounting groove 3A11. In this way, when assembling the double-break circuit breaker, the arc-blocking plate group 3A can be assembled as a whole, which helps to improve assembly efficiency.

[0097] Furthermore, in this embodiment, the circumferential wall of the first mounting groove 3A11 is provided with a first reinforcing rib 3A12, and the soft magnetic plate 3A2 is interference-fitted with the first mounting groove 3A11 through the first reinforcing rib 3A12. This simplifies the combination of the plastic arc-blocking plate 3A1 and the soft magnetic plate 3A2.

[0098] In some preferred embodiments of this application, the shape of the first reinforcing rib 3A12 may be a triangle, with the vertex of the triangle facing the first mounting groove 3A11.

[0099] It should be noted that in some other embodiments of this application, the assembly of the soft magnetic plate 3A2 and the plastic arc-blocking plate 3A1 can also adopt other structures, such as screw connection, bonding, etc.

[0100] Please combine Figures 1 to 3 In some embodiments of this application, in the arc extinguishing zone 3M, both the first sub-arc extinguishing structure 31 and the second sub-arc extinguishing structure 32 include an arc extinguishing chamber 3B. The two arc extinguishing chambers 3B are arranged side by side on both sides of the partition 33 along the first direction D1. The entrance of the arc extinguishing chamber 3B of the first sub-arc extinguishing structure 31 faces the first contact group 21 and is used to extinguish the arc generated by the first contact group 21. The entrance of the arc extinguishing chamber 3B of the second sub-arc extinguishing structure 32 faces the second contact group 22 and is used to extinguish the arc generated by the second contact group 22.

[0101] Along the first direction D1, a magnetic shield 3C is also provided between the partition 33 and one of the two arc-extinguishing chambers 3B. The magnetic shield 3C is used to prevent magnetic interference between the two arc-extinguishing chambers 3B.

[0102] Specifically, after the arc is generated in the arc initiation zone 3L, under the action of the four sets of arc-extinguishing plates 3A, the arc generated when the first contact group 21 breaks and the arc generated when the second contact group 22 breaks will enter the corresponding arc-extinguishing chambers 3B respectively. One arc-extinguishing chamber 3B is used to extinguish the arc generated when the first contact group 21 breaks, and the other arc-extinguishing chamber 3B is used to extinguish the arc generated when the second contact group 22 breaks. The partition plate 33 is located between the two arc-extinguishing chambers 3B, which can prevent arc crossing between the two arc-extinguishing chambers 3B and improve the arc-extinguishing effect.

[0103] Furthermore, during the arc extinguishing process, the electric arc vibrates violently under the cutting action of the arc-extinguishing grid, generating a strong interfering magnetic field. A magnetic shield 3C is also installed between the partition 33 and one of the two arc-extinguishing chambers 3B. The magnetic shield 3C's magnetic shielding function can isolate the electromagnetic interference between the two arc-extinguishing chambers 3B, thereby helping to extinguish the arc.

[0104] Figure 5 This is a schematic diagram of the structure of an arc-extinguishing chamber 3B provided in an embodiment of this application. Figure 6 for Figure 5 The exploded view of arc-extinguishing chamber 3B shown is provided. Please refer to the diagram. Figure 1 , Figure 3 , Figure 5 and Figure 6In some embodiments of this application, along the third direction D3, the arc-extinguishing chamber 3B includes a plurality of alternately arranged first arc-extinguishing grid plates 3B1 and second arc-extinguishing grid plates 3B2. Along the second direction D2, the first arc-extinguishing grid plates 3B1 include a first slot 3B11 opening towards the arc-initiating region 3L, and the second arc-extinguishing grid plates 3B2 include a second slot 3B21 opening towards the arc-initiating region 3L. The bottoms of the plurality of first slots 3B11 are aligned, the bottoms of the plurality of second slots 3B21 are aligned, and the bottoms of the first slots 3B11 and second slots 3B21 are staggered. The first direction D1, the second direction D2, and the third direction D3 are perpendicular to each other.

[0105] In this way, multiple first slots 3B11 can form a first set of blades for cutting the electric arc, and multiple second slots 3B21 can form a second set of blades for cutting the electric arc. In one embodiment, if the distance between the first slot 3B11 and the arc-initiating region 3L is closer than that between the second slots 3B21, then the electric arc from the arc-initiating region 3L will first be cut by the first set of blades, forming a shorter arc, and then cut by the second set of blades, forming an even shorter arc. In practice, it has been found that the staggered arrangement of the first slots 3B11 and the second slots 3B21 has a better cutting effect on the electric arc.

[0106] Please continue to refer to this. Figure 1 , Figure 3 , Figure 5 and Figure 6 In some embodiments of this application, the first arc-extinguishing grid plate 3B1 and the second arc-extinguishing grid plate 3B2 have different lengths. When arranged, the ends of the first arc-extinguishing grid plate 3B1 and the second arc-extinguishing grid plate 3B2 away from the arc-starting region 3L are aligned, while the ends closer to the arc-starting region 3L form an irregular structure. The irregular structure also helps to cut the electric arc.

[0107] Figure 7 for Figure 3 Axonometric view of diaphragm 33 Figure 8 for Figure 7 A side view, Figure 9 for Figure 7 Another side view, Figure 8 and Figure 9 for Figure 7 The diagram shows the structural schematics of the two sides of the structure shown. Please refer to... Figure 1 , Figure 2 , Figure 3 , Figure 7 , Figure 8 and Figure 9 In the arc-starting area 3L, along the first direction D1, a second mounting groove 331 is provided on one side of the partition 33, and a third mounting groove 332 is provided on the other side of the partition 33.

[0108] A set of arc-blocking plates 3A of the first arc-extinguishing structure 31 is fixed at the second mounting groove 331.

[0109] A set of arc-blocking plates 3A of the second arc-extinguishing structure 32 is fixed at the third mounting groove 332.

[0110] In the arc-extinguishing zone 3M, along the first direction D1, a fourth mounting groove 333 is provided on one side of the partition 33, and a fifth mounting groove 334 is provided on the other side of the partition 33. The magnetic shielding component 3C is fixed at the fourth mounting groove 333. The arc-extinguishing chamber 3B of the first sub-arc-extinguishing structure 31 is positioned near the partition 33 by the circumferential groove wall of the fourth mounting groove 333. The arc-extinguishing chamber 3B of the second sub-arc-extinguishing structure 32 is positioned near the partition 33 by the circumferential groove wall of the fifth mounting groove 334, and the bottom of the fifth mounting groove 334 is provided with multiple first positioning strips 3341, which are used to position the arc-extinguishing grid of the second sub-arc-extinguishing structure 32.

[0111] Thus, based on the dual-break circuit breaker provided by this embodiment, the partition 33 integrates multiple functions. The partition 33 not only serves as electrical isolation between the first sub-arc extinguishing structure 31 and the second sub-arc extinguishing structure 32, but also as a means of fixing and installing the two sets of arc-isolating plate assemblies 3A and the magnetic shielding component 3C. Furthermore, it is used for positioning the arc-extinguishing grid plates of the two arc-extinguishing chambers 3B and the second sub-arc extinguishing structure 32. This facilitates the simplification of the overall structure of the dual-break circuit breaker.

[0112] Please continue to refer to this. Figures 7 to 9 In some embodiments of this application, cylindrical positioning blocks 33A are provided at the bottom of both the second mounting groove 331 and the third mounting groove 332, and multiple arc-shaped second reinforcing ribs 33B are arranged on the side of the cylindrical positioning blocks 33A.

[0113] Please refer to Figure 3 In the second arc-extinguishing structure 32, there is a set of arc-extinguishing plates 3A near the partition 33, and the plastic arc-extinguishing plate 3A1 is provided with a round hole 3A13 that matches the cylindrical positioning block 33A.

[0114] Thus, when the arc-blocking plate assembly 3A is fixed to the third mounting groove 332, the fixed connection is achieved through the interference fit between the arc-blocking plate assembly 3A and the cylindrical positioning block 33A. This connection structure has the advantages of being simple and convenient.

[0115] It should be noted that in some other embodiments of this application, the arc-blocking plate assembly 3A and the partition plate 33 can also be fixed in other ways, such as screw connection, welding, adhesive bonding, etc.

[0116] Figure 10 This is an isometric view of a magnetic shielding component 3C provided in an embodiment of this application. Figure 11 for Figure 10Please refer to Figure 3 for the exploded view. Figure 7 , Figure 10 and Figure 11 In some embodiments of this application, the magnetic shielding component 3C includes an insulating plate 3C1 and a shielding plate 3C2. Along the first direction D1, the insulating plate 3C1 is embedded in a fourth mounting groove 333 and is interference-fitted with the fourth mounting groove 333. A sixth mounting groove 3C11 is provided on the side of the insulating plate 3C1 near the partition plate 33, and the shielding plate 3C2 is interference-fitted with the sixth mounting groove 3C11. A plurality of second positioning strips 3C12 are provided on the other side of the insulating plate 3C1, and the second positioning strips 3C12 are used to position the arc-extinguishing grid of the first sub-arc-extinguishing structure 31.

[0117] Specifically, in this embodiment, a sixth mounting groove 3C11 is provided on one side of the insulating plate 3C1, and a plurality of second positioning strips 3C12 are provided on the other side of the insulating plate 3C1. Thus, when the magnetic shielding component 3C is assembled with the partition 33, the shielding plate 3C2 can be fixed through the sixth mounting groove 3C11. Then, the side of the insulating plate 3C1 with the shielding plate 3C2 facing the partition 33 is inserted into the fourth mounting groove 333. The side of the insulating plate 3C1 with the plurality of second positioning strips 3C12 can be used for positioning the arc-extinguishing grid of the first sub-arc extinguishing structure 31. In this way, the magnetic shielding component 3C can not only be installed through the partition 33 and has the function of magnetic shielding, but also play a positioning role for the arc-extinguishing grid of the first sub-arc extinguishing structure 31. The overall structure is ingeniously designed, simple to assemble, and highly integrated.

[0118] For example, in this embodiment, the shielding plate 3C2 can be an iron plate or other metal plate with shielding function.

[0119] In addition, in some embodiments of this application, a rectangular anti-misfit block 3C13 may be provided on the edge of the insulating plate 3C1, and an anti-misfit groove may be provided at the corresponding location of the fourth mounting groove 333 to prevent misassembly during assembly and facilitate early identification of the assembly direction.

[0120] Please continue to refer to this. Figure 2 , Figure 3 , Figures 7 to 9 In some embodiments of this application, along the second direction D2, a plurality of first anti-arc stripping baffles 3331 are also provided on the side of the fourth mounting groove 333 away from the second mounting groove 331. Along the first direction D1, the first anti-arc stripping baffles 3331 extend from the partition 33 to the outlet of the arc-extinguishing chamber 3B of the first sub-arc extinguishing structure 31. Along the third direction D3, a plurality of anti-arc stripping baffles are arranged sequentially, with a gap between adjacent first anti-arc stripping baffles 3331.

[0121] On the side of the fifth mounting slot 334 away from the third mounting slot 332, a plurality of second anti-arc strips 3342 are also provided. Along the first direction D1, the second anti-arc strips 3342 extend from the partition 33 to the outlet of the arc-extinguishing chamber 3B of the second sub-arc extinguishing structure 32. Along the third direction D3, the plurality of second anti-arc strips 3342 are arranged in sequence, with a gap between adjacent second anti-arc strips 3342.

[0122] Specifically, as mentioned above, the arc-extinguishing chamber 3B of the first sub-arc-extinguishing structure 31 is positioned near the partition plate 33 by the circumferential wall of the fourth mounting groove 333, and the arc-extinguishing chamber 3B of the second sub-arc-extinguishing structure 32 is positioned near the partition plate 33 by the circumferential wall of the fifth mounting groove 334. Along the second direction D2, the arc moves from the arc-initiating zone 3L to the arc-extinguishing zone 3M. During this movement, the arc is cut by the arc-extinguishing grid of the arc-extinguishing chamber 3B, shortening the arc, reducing its energy, and gradually extinguishing it. When the arc moves to the side of the fourth mounting groove 333 away from the second mounting groove 331, or when the arc moves to the side of the fifth mounting groove 334 away from the third mounting groove 332, the arc energy is already relatively low, but the risk of secondary arc initiation still exists.

[0123] In this embodiment, the fourth mounting slot 333 is provided with a plurality of first anti-arc crosstalk baffles 3331 arranged along the third direction D3 on the side away from the second mounting slot 331, and the fifth mounting slot 334 is provided with a plurality of second anti-arc crosstalk baffles 3342 arranged along the third direction D3 on the side away from the second mounting slot 331. In this way, the arc can be further cut by the plurality of first anti-arc crosstalk baffles 3331 and second anti-arc crosstalk baffles 3342, preventing short arcs from reconnecting and becoming long arcs at the outlet of the arc extinguishing chamber 3B, thus ensuring the arc extinguishing effect.

[0124] Figure 12 This is a schematic diagram of the structure of the first part 11 provided in the embodiments of this application. Figure 13 This is a schematic diagram of the structure of the second part 12 provided in an embodiment of this application. Please refer to... Figure 1 , Figure 2 , Figure 7 , Figure 12 and Figure 13 In some embodiments of this application, along the second direction D2, the arc extinguishing system 3 further includes a pressure relief zone 3N, which is located on the side of the arc extinguishing zone 3M away from the arc initiation zone 3L.

[0125] Along the second direction D2, the housing 1 includes a first part 11 and a second part 12 that are interlocked, and the arc extinguishing system 3 and the contact system 2 are both located in the cavity formed by the first part 11 and the second part 12.

[0126] Along the second direction D2, in the pressure relief zone 3N, the partition 33 and the first part 11 form a pressure relief channel 3N1 for the first sub-arc extinguishing structure 31. The partition 33 and the second part 12 form a pressure relief channel for the second sub-arc extinguishing structure 32.

[0127] Along the direction of gas flow, the pressure relief channel 3N1 of the first sub-arc extinguishing structure 31 and / or the pressure relief channel 3N1 of the second sub-arc extinguishing structure 32 becomes wider.

[0128] For example, please refer to Figure 1 , Figures 7 to 9 , Figure 1 The leftmost dashed box contains the pressure relief zone 3N. Within this zone, the baffle 33 is stepped, appearing in the current diagram as having two steps, with the width increasing from top to bottom. Consequently, the pressure relief channel 3N1, formed by the baffle 33, the first part 11, and the second part 12, also widens from top to bottom. This structural design is based on aerodynamic principles: smaller spaces have higher pressures, and larger spaces have lower pressures. Thus, along the direction of gas flow, the pressure relief channel 3N1 widens, allowing gas to move from high pressure to low pressure, quickly expelling the high-temperature gas mass generated by the electric arc.

[0129] Please continue to refer to this. Figure 1 It should be noted that the stepped shape of the baffle 33 is to accommodate the widening of the pressure relief channel 3N1 along the direction of gas flow. However, to achieve this widening, the baffle 33's formation in the pressure relief zone 3N is not limited to a stepped shape. In actual products, the shape of the baffle 33 must not only meet basic functional requirements but also consider the shapes of other internal structures within the double-break circuit breaker.

[0130] Please combine Figure 3 , Figure 12 and Figure 13 In some embodiments of this application, along the first direction D1, the first portion 11 is located on the side of the first sub-arc extinguishing structure 31 away from the second sub-arc extinguishing structure 32, and the second portion 12 is located on the side of the second sub-arc extinguishing structure 32 away from the first sub-arc extinguishing structure 31.

[0131] The first part 11 is also provided with a first positioning structure 111 for installing the first sub-arc extinguishing structure 31 on the side near the first sub-arc extinguishing structure 31. The first sub-arc extinguishing structure 31 is positioned by the first positioning structure 111 on the side near the first part 11.

[0132] The second part 12 is also provided with a second positioning structure 121 for installing the second sub-arc extinguishing structure 32 on the side near the second sub-arc extinguishing structure 32. The second sub-arc extinguishing structure 32 is positioned by the second positioning structure 121 on the side near the second part 12.

[0133] Specifically, when assembling a dual-break circuit breaker, the first sub-arc extinguishing structure 31 and the second sub-arc extinguishing structure 32 need to be accurately installed inside the housing 1.

[0134] In some embodiments of this application, a first positioning structure 111 for installing the first sub-arc extinguishing structure 31 is provided on the side of the first part 11 near the first sub-arc extinguishing structure 31, and a second positioning structure 121 for installing the second sub-arc extinguishing structure 32 is provided on the side of the second part 12 near the second sub-arc extinguishing structure 32, thereby facilitating the accurate installation of the first sub-arc extinguishing structure 31 and the second sub-arc extinguishing structure 32.

[0135] Specifically, in some embodiments of this application, the first positioning structure 111 includes a third positioning strip 1111 for positioning the arc-extinguishing grid plate of the arc-extinguishing chamber 3B in the first sub-arc-extinguishing structure 31, and the second positioning structure 121 includes a fourth positioning strip 1211 for positioning the arc-extinguishing grid plate of the arc-extinguishing chamber 3B in the second sub-arc-extinguishing structure 32.

[0136] Therefore, please combine Figure 3 , Figures 7 to 9 , Figure 12 and Figure 13 In some embodiments of this application, along the first direction D1, one side of the arc-extinguishing grid in the first sub-arc extinguishing structure 31 is positioned by the second positioning strip 3C12 on the insulating plate 3C1, and the other side of the arc-extinguishing grid is positioned by the third positioning strip 1111 of the first part 11. In this way, it can be ensured that there is an appropriate gap between the arc-extinguishing grids in the first sub-arc extinguishing structure 31, thereby improving the arc extinguishing effect.

[0137] Similarly, in some embodiments of this application, along the first direction D1, one side of the arc-extinguishing grid in the second sub-arc extinguishing structure 32 is positioned by the first positioning strip 3341 at the fifth mounting groove 334 on the partition 33, and the other side of the arc-extinguishing grid is positioned by the fourth positioning strip 1211 of the second part 12. In this way, it can be ensured that there is an appropriate gap between the arc-extinguishing grids in the second sub-arc extinguishing structure 32, thereby improving the arc extinguishing effect.

[0138] Please combine Figure 3 , Figure 4 and Figure 12In some embodiments of this application, the first positioning structure 111 further includes a positioning groove 1112 for mounting the arc-extinguishing plate assembly 3A and a positioning protrusion 1113 disposed at the bottom of the positioning groove 1112. The shape of the positioning groove 1112 is adapted to the shape of the plastic arc-extinguishing plate 3A1 of the arc-extinguishing plate assembly 3A near the first part 11 in the first sub-arc extinguishing structure 31, and the arc-extinguishing plate assembly 3A can be positioned by the positioning groove 1112. In addition, the plastic arc-extinguishing plate 3A1 is also provided with a positioning groove 3A14 adapted to the positioning protrusion 1113. Through the cooperation between the positioning protrusion 1113 and the positioning groove 3A14, the arc-extinguishing plate assembly 3A can be prevented from falling off from the positioning groove 1112.

[0139] The installation of the arc-isolating plate group 3A near the second part 12 in the second sub-arc extinguishing structure 32 is similar to the installation of the arc-isolating plate group 3A near the first part 11 in the first sub-arc extinguishing structure 31, and will not be described again here.

[0140] Those skilled in the art will understand that although some embodiments herein include certain features included in other embodiments but not others, combinations of features from different embodiments are intended to be within the scope of this application and form different embodiments. For example, in the claims, any of the claimed embodiments can be used in any combination.

[0141] The above-described embodiments are merely illustrative of the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to depart from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A double-break circuit breaker, characterized by Includes a housing and a contact system and an arc-extinguishing system located within the housing; The contact system includes a first contact group and a second contact group. The first contact group includes a first stationary contact and a first moving contact that can be separated and joined. The second contact group includes a second stationary contact and a second moving contact that can be separated and joined. Along a first direction, the first stationary contact and the second stationary contact are arranged side by side, and the first moving contact and the second moving contact are arranged side by side. When the double-break circuit breaker is closed, the first contact group and the second contact group are connected in series. The arc extinguishing system includes a first sub-arc extinguishing structure, a second sub-arc extinguishing structure, and a partition. Along the first direction, the partition is disposed between the first contact group and the second contact group. The first sub-arc extinguishing structure and the second sub-arc extinguishing structure are disposed side by side on both sides of the partition, and the first sub-arc extinguishing structure is disposed corresponding to the first contact group to extinguish the arc generated when the first contact group breaks. The second sub-arc extinguishing structure is disposed corresponding to the second contact group to extinguish the arc generated when the first contact group breaks. Along the second direction, the arc extinguishing system includes an arc initiation zone and an arc extinguishing zone. The arc initiation zone corresponds to the area where the first contact group and the second contact group are located. The electric arc is generated in the arc initiation zone and extinguished in the arc extinguishing zone. The partition extends from the arc initiation zone to the arc extinguishing zone and is used for electrical isolation between the first sub-arc extinguishing structure and the second sub-arc extinguishing structure in the arc initiation zone and the arc extinguishing zone. The first direction is perpendicular to the second direction.

2. The double-break circuit breaker according to claim 1, characterized in that, In the arc-initiating zone, the first sub-arc-extinguishing structure and the second sub-arc-extinguishing structure each include two sets of arc-isolating plate groups. Each set of arc-isolating plate groups includes a plastic arc-isolating plate and a soft magnetic plate. Under the action of an electric arc, the plastic arc-isolating plate can generate arc-extinguishing gas. Under the action of an electric arc, the soft magnetic plate can be magnetized. Along the first direction, the two plastic arc-extinguishing plates in the first sub-arc extinguishing structure are disposed on opposite sides of the first contact group, and the two soft magnetic plates in the first sub-arc extinguishing structure are respectively disposed on the side of the two plastic arc-extinguishing plates in the first sub-arc extinguishing structure that are far away from each other. Along the first direction, the two plastic arc-extinguishing plates in the second sub-arc extinguishing structure are disposed on opposite sides of the second contact group, and the two soft magnetic plates in the second sub-arc extinguishing structure are respectively disposed on the side of the two plastic arc-extinguishing plates in the second sub-arc extinguishing structure that are far away from each other.

3. The double-break circuit breaker according to claim 2, characterized in that, The plastic arc-blocking plate has a first mounting groove on one side, and a first reinforcing rib is provided on the circumferential wall of the first mounting groove. The soft magnetic plate is interference-fitted with the first mounting groove through the first reinforcing rib.

4. The double-break circuit breaker according to claim 2 or 3, characterized in that, In the arc-extinguishing zone, both the first sub-arc-extinguishing structure and the second sub-arc-extinguishing structure include an arc-extinguishing chamber. The two arc-extinguishing chambers are arranged side by side on both sides of the partition along the first direction. The entrance of the arc-extinguishing chamber of the first sub-arc-extinguishing structure faces the first contact group and is used to extinguish the arc generated by the first contact group. The entrance of the arc-extinguishing chamber of the second sub-arc-extinguishing structure faces the second contact group and is used to extinguish the arc generated by the second contact group. Along the first direction, a magnetic shield is further provided between the partition and one of the two arc-extinguishing chambers, the magnetic shield being used to prevent magnetic interference between the two arc-extinguishing chambers.

5. The double-break circuit breaker according to claim 4, characterized in that, Along a third direction, the arc-extinguishing chamber includes a plurality of alternating first arc-extinguishing grid plates and second arc-extinguishing grid plates; Along the second direction, the first arc-extinguishing grid includes a first slot with an opening facing the arc-starting area, and the second arc-extinguishing grid includes a second slot with an opening facing the arc-starting area. The bottoms of the plurality of first slots are aligned, the bottoms of the plurality of second slots are aligned, and the bottoms of the first slots and the second slots are staggered. The first direction, the second direction, and the third direction are perpendicular to each other.

6. The double-break circuit breaker according to claim 4, characterized in that, In the arc-initiating area, along the first direction, a second mounting groove is provided on one side of the partition, and a third mounting groove is provided on the other side of the partition; A set of arc-blocking plates of the first sub-arc extinguishing structure is fixed at the second mounting groove; A set of arc-blocking plates of the second sub-arc extinguishing structure is fixed at the third mounting groove; In the arc-extinguishing zone, along the first direction, a fourth mounting groove is provided on one side of the partition, and a fifth mounting groove is provided on the other side of the partition; the magnetic shielding component is fixed at the fourth mounting groove, and the arc-extinguishing chamber of the first sub-arc-extinguishing structure is positioned near the partition by the circumferential wall of the fourth mounting groove; the arc-extinguishing chamber of the second sub-arc-extinguishing structure is positioned near the partition by the circumferential wall of the fifth mounting groove, and a plurality of first positioning strips are provided at the bottom of the fifth mounting groove, the first positioning strips being used to position the arc-extinguishing grid of the first sub-arc-extinguishing structure.

7. The double-break circuit breaker according to claim 6, characterized in that, The magnetic shielding component includes an insulating plate and a shielding plate; Along the first direction, the insulating plate is embedded in the fourth mounting groove and is interference-fitted with the fourth mounting groove; The insulating plate has a sixth mounting groove on the side near the partition, and the shielding plate is interference-fitted with the sixth mounting groove; the other side of the insulating plate has a plurality of second positioning strips, which are used to position the arc-extinguishing grid of the second sub-arc extinguishing structure.

8. The double-break circuit breaker according to claim 7, characterized in that, Along the second direction, a plurality of first anti-arc strips are provided on the side of the fourth mounting groove away from the second mounting groove; along the first direction, the first anti-arc strips extend from the partition to the outlet of the arc-extinguishing chamber of the first sub-arc extinguishing structure; along the third direction, a plurality of anti-arc strips are arranged in sequence, and there is a gap between two adjacent first anti-arc strips. The fifth mounting slot is further provided with a plurality of second anti-arc strips on the side away from the third mounting slot; along the first direction, the second anti-arc strips extend from the partition to the outlet of the arc extinguishing chamber of the second sub-arc extinguishing structure; along the third direction, the plurality of second anti-arc strips are arranged in sequence, and there is a gap between two adjacent second anti-arc strips.

9. The double-break circuit breaker according to claim 4, characterized in that, Along the second direction, the arc-extinguishing system further includes a pressure relief zone, which is located on the side of the arc-extinguishing zone away from the arc-initiating zone; Along the second direction, the housing includes a first part and a second part that engage with each other, and the arc extinguishing system and the contact system are both located in the cavity formed by the first part and the second part; Along the second direction, in the pressure relief zone, the partition and the first portion form a pressure relief channel for the first sub-arc extinguishing structure; the partition and the second portion form a pressure relief channel for the second sub-arc extinguishing structure. Along the direction of gas flow, the pressure relief channels of the first sub-arc extinguishing structure and / or the second sub-arc extinguishing structure become wider.

10. The double-break circuit breaker according to claim 9, characterized in that, Along the first direction, the first part is located on the side of the first sub-arc extinguishing structure away from the second sub-arc extinguishing structure, and the second part is located on the side of the second sub-arc extinguishing structure away from the first sub-arc extinguishing structure; The first part is further provided with a first positioning structure for installing the first sub-arc extinguishing structure on the side near the first sub-arc extinguishing structure, and the first sub-arc extinguishing structure is positioned by the first positioning structure on the side near the first part. The second part is further provided with a second positioning structure for installing the second sub-arc extinguishing structure on the side near the second sub-arc extinguishing structure. The side of the second sub-arc extinguishing structure near the second part is positioned by the second positioning structure.

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