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 conductive system comprising a first stationary contact, a second stationary contact, a moving contact, a first terminal, and a second terminal. The double-break circuit breaker provided by this application adds a second stationary contact arranged parallel to the first stationary contact in a first direction, and positions the moving contact on the same side of the first and second stationary contacts. The circuit breaker's opening and closing are achieved through the contact and separation between the same moving contact and the two stationary contacts. The contact structure is relatively simple and easy to implement. Furthermore, in terms of the conductive system layout, along a third direction, current can enter the double-break circuit breaker from either the first or second terminal and exit from the other terminal. The overall size of the double-break circuit breaker is not significantly increased, resulting in a smaller volume.

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, single-break 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. Existing double-break circuit breakers have the disadvantages of complex structure and large size. Utility Model Content

[0004] This application provides a double-break circuit breaker, which has the characteristics of simple structure, small size and easy implementation, and solves the problems of complex structure and large size of existing double-break circuit breakers.

[0005] The technical solution of this application is as follows:

[0006] The double-break circuit breaker provided in this application includes a conductive system, which includes a first stationary contact, a second stationary contact, a moving contact, a first terminal block, and a second terminal block.

[0007] The first stationary contact includes a first contact segment and a first flow guiding segment, and the second stationary contact includes a second contact segment and a second flow guiding segment. The first contact segment and the second contact segment are arranged side by side along a first direction and both extend along a second direction. The first flow guiding segment extends along a third direction and is connected to one side of the first contact segment. The second flow guiding segment extends along a third direction and is connected to the side of the second contact segment away from the first flow guiding segment. The first direction, the second direction, and the third direction are perpendicular to each other.

[0008] Along a third direction, a first stationary contact is provided on the side of the first contact segment away from the first flow guide segment, and a second stationary contact is provided on the side of the second contact segment away from the first flow guide segment. A moving contact is located on the side of the first and second stationary contacts away from the first flow guide segment. The moving contact includes an integrally formed first moving contact arm, a second moving contact arm, and a connecting portion connecting the first moving contact arm and the second moving contact arm. The first moving contact arm has a first moving contact opposite to the first stationary contact, and the second moving contact arm has a second moving contact opposite to the second stationary contact.

[0009] The first terminal is connected to the end of the first guide section away from the second guide section, and the second terminal is connected to the end of the second guide section away from the first guide section.

[0010] The double-break circuit breaker provided in this application, based on the existing single-break circuit breaker, adds a second stationary contact arranged parallel to the first stationary contact in a first direction, and positions the moving contact on the same side of the first and second stationary contacts. The circuit breaker's closing and opening are achieved through the contact and separation between the same moving contact and the two stationary contacts. The contact structure is relatively simple and easy to implement.

[0011] Furthermore, in this application, the first stationary contact includes a first contact segment and a first current-guiding segment, and the second stationary contact includes a second contact segment and a second current-guiding segment. The first contact segment and the second contact segment are arranged side by side along a first direction and both extend along a second direction. The first current-guiding segment extends along a third direction and is connected to one side of the first contact segment. The second current-guiding segment extends along a third direction and is connected to the side of the second contact segment away from the first current-guiding segment. A first stationary contact is provided on the side of the first contact segment away from the first current-guiding segment, and a second stationary contact is provided on the side of the second contact segment away from the first current-guiding segment. The moving contact is located on the side of the first stationary contact and the second stationary contact away from the first current-guiding segment. A first terminal is connected to the end of the first current-guiding segment away from the second current-guiding segment, and a second terminal is connected to the end of the second current-guiding segment away from the first current-guiding segment. Thus, in the layout of the conductive system of this application, along a third direction, current can enter the double-break circuit breaker from either the first terminal or the second terminal, and exit from the other terminal. The overall layout of the conductive system is similar to that of existing single-break circuit breakers; therefore, the overall size of the double-break circuit breaker is not significantly increased, and the double-break circuit breaker has a smaller volume.

[0012] In one possible design, the double-break circuit breaker includes an arc-extinguishing chamber. Along a third direction, the arc-extinguishing chamber is disposed on the side of the first stationary contact and the second stationary contact near the first terminal block, and the inlet of the arc-extinguishing chamber faces the first contact segment and the second contact segment.

[0013] The second stationary contact also includes a second arc-guiding segment, which is integrally formed with the second contact segment. The second arc-guiding segment is connected to the side of the second contact segment away from the second flow-guiding segment and extends to the top of the arc-extinguishing chamber, forming an arc-extinguishing gap with the arc-extinguishing grid plate of the arc-extinguishing chamber.

[0014] Based on the double-break circuit breaker provided by this embodiment, when the second moving contact separates from the second stationary contact, part of the arc can enter the arc-extinguishing gap along the second arc-conducting segment. The arc-extinguishing gap has the function of interrupting the arc, thus improving the arc-extinguishing capacity of the arc-extinguishing chamber and thereby improving the working reliability of the double-break circuit breaker.

[0015] In one possible design, along the second direction, the second contact segment includes opposing first and second ends, with the second end located between the top and bottom of the arc-extinguishing chamber. The second stationary contact is located between the first and second ends.

[0016] The second guide section is connected to the first end, and the second guide arc section is connected to the second end.

[0017] The second guiding arc segment includes an arc-extinguishing sub-segment, a circular arc guiding arc segment, and a ramp arc-inducing segment. The arc-extinguishing sub-segment is located at the top of the arc-extinguishing chamber, forming an arc-extinguishing gap between it and the top of the arc-extinguishing chamber. One end of the circular arc guiding arc segment is connected to the second end, and the other end of the circular arc guiding arc segment is smoothly connected to the arc-extinguishing sub-segment via the ramp arc-inducing segment.

[0018] Based on the double-break circuit breaker provided in this embodiment, the second contact section includes a first end and a second end opposite to each other. The second stationary contact is located between the first end and the second end, and the second current-conducting section and the second arc-conducting section are located at opposite ends of the second contact section. Thus, when the second moving contact separates from the second stationary contact, the second arc-conducting section guides the arc from the second stationary contact towards the arc-extinguishing chamber, thereby reducing the arc's erosion of the second current-conducting section.

[0019] Furthermore, in this embodiment, the second arc-guiding segment includes an arc-extinguishing sub-segment, a circular arc-guiding segment, and a ramp arc-guiding segment. The circular arc-guiding segment and the ramp arc-guiding segment mainly serve to guide the movement of the electric arc, guiding part of the electric arc from the second stationary contact to the arc-extinguishing chamber and the arc-extinguishing gap formed between the arc-extinguishing chamber and the arc-extinguishing sub-segment, thus helping to extinguish the electric arc.

[0020] In one possible design, the arc-extinguishing segment includes a first dimension and a second dimension, the first dimension being the dimension of the arc-extinguishing segment along a first direction, and the second dimension being the dimension of the arc-extinguishing segment along a second direction, wherein the first dimension is larger than the second dimension.

[0021] Based on the dual-break circuit breaker provided by this embodiment, the first dimension of the arc-extinguishing segment is larger than the second dimension. Thus, the arc-extinguishing segment has a flat structure as a whole, and the contact area between the arc-extinguishing segment and the electric arc is larger, which is beneficial for arc extinguishing.

[0022] In one possible design, the second flow guide section is located on the side of the second contact section away from the first contact section. The second flow guide section includes a third dimension and a fourth dimension. The third dimension is the dimension of the second flow guide section along the first direction, and the fourth dimension is the dimension of the second flow guide section along the second direction. The third dimension is smaller than the fourth dimension.

[0023] Based on the double-break circuit breaker provided in this embodiment, the second current-conducting section is located on the side of the second contact section away from the first contact section. This helps to increase the insulation distance between the second current-conducting section and the first contact section, maintaining the normal function of the main circuit of the double-break circuit breaker. Furthermore, in this embodiment, the third dimension of the second current-conducting section is smaller than the fourth dimension, which helps to reduce the size of the double-break circuit breaker in the first direction.

[0024] In one possible design, the double-break circuit breaker includes a housing comprising a first portion and a second portion that interlock along a first direction. The conductive system and the arc-extinguishing chamber are located within the cavity formed by the first and second portions. The first portion is located on the side of the second stationary contact away from the first stationary contact, and has a receiving groove for accommodating a second current-conducting section, which is embedded in the receiving groove. This facilitates the installation and positioning of the second stationary contact along the first direction.

[0025] In one possible design, a first positioning structure is provided between the arc-extinguishing segment and the first part along the first direction. The first positioning structure is used to position the second stationary contact in the third direction of the second part.

[0026] The first positioning structure includes a positioning groove and a positioning boss that can be interlocked with each other. One of the positioning groove and the positioning boss is located in the arc extinguishing segment, and the other is located in the first part.

[0027] Based on the dual-break circuit breaker provided by this embodiment, the position of the second stationary contact in the third-party upward direction is a critical position. The accuracy of the position of the second stationary contact in the third-party upward direction affects the reliability of the contact between the moving contact and the second stationary contact. This application provides a first positioning structure between the arc extinguishing segment and the first part. The position of the second stationary contact in the third-party upward direction is defined by the first positioning structure, thereby improving the reliability of the contact between the second stationary contact and the moving contact.

[0028] In one possible design, the double-break circuit breaker also includes a housing, with the conductive system located within the housing, and the conductive system also includes a bimetallic component.

[0029] Along a third direction, the bimetallic assembly is located on the side of the moving contact away from the first and second stationary contacts. Inside the housing, the bimetallic assembly is isolated from the area where the electric arc occurs by a baffle fixed to the housing.

[0030] Based on the dual-break circuit breaker provided by this embodiment, by setting a baffle on the housing to isolate the bimetallic component from the arc area, it is possible to avoid arc erosion of the bimetallic component and improve the safety and reliability of the bimetallic component operation.

[0031] In one possible design, the bimetallic component includes a bimetallic part, a bimetallic bracket, and an adjusting screw.

[0032] The bimetallic bracket consists of a connecting limiting end, a bent portion, and a welding end. The limiting end mates with a limiting groove on the housing. The welding end is welded to the surface of the bimetallic component. An adjustment gap is formed between the limiting end and the bimetallic component through the bent portion.

[0033] The adjusting screw is threaded onto the housing and is located on the side of the bimetallic component away from the bimetallic bracket. The head of the adjusting screw is directly opposite the end of the bimetallic component that is welded to the bimetallic bracket.

[0034] Based on the dual-break circuit breaker provided in this embodiment, the bimetallic bracket is one of the components that determines the position of the bimetallic element. The bimetallic bracket includes a limiting end, and the installation position of the bimetallic bracket can be determined by a limiting groove on the housing that matches the shape of the limiting end. The bimetallic bracket also includes a welding end, which can be fixed to one end of the bimetallic element. Thus, after the bimetallic bracket is installed on the housing via the limiting end, the initial position of the bimetallic element is determined. Based on this, the position of the bimetallic element can be further fine-tuned by adjusting the screw, thereby improving the positional accuracy of the bimetallic element. Furthermore, the bimetallic bracket and the adjusting screw are located on opposite sides of the bimetallic element, providing stable support for the bimetallic element.

[0035] In one possible design, the housing includes a first portion and a second portion that are engaged along a first direction, with the conductive system located in the cavity enclosed by the first portion and the second portion.

[0036] The limiting end includes a body and lugs disposed on both sides of the body.

[0037] The limiting groove includes a first limiting groove and a second limiting groove, with the first limiting groove disposed in the first part and the second limiting groove disposed in the second part.

[0038] The lug on one side of the limiting end is inserted into the first limiting groove, and the lug on the other side of the limiting end is inserted into the second limiting groove.

[0039] A V-groove is provided at the connection between the lug and the body.

[0040] Based on the dual-break circuit breaker provided in this embodiment, the bimetallic bracket can engage with the first and second limiting grooves on the housing via lugs on both sides, thus initially determining the position of the bimetallic component. After initial installation, adjusting screws are used to press against the bimetallic component from the other side, thereby providing effective support for the bimetallic component.

[0041] During the adjustment of the bimetallic component's position using the adjusting screw, the bimetallic bracket will also experience corresponding resistance. The V-groove design helps improve the toughness of the welded end and reduces adjustment resistance. Attached Figure Description

[0042] Figure 1This is a schematic diagram of the structure of a double-break circuit breaker provided in an embodiment of this application.

[0043] Figure 2 This is a schematic diagram of the conductive system in a double-break circuit breaker.

[0044] Figure 3 This is a schematic diagram of the combined structure of the conductive system and the arc-extinguishing chamber.

[0045] Figure 4 for Figure 1 , Figure 2 , Figure 3 A schematic diagram of the structure of the second stationary contact.

[0046] Figure 5 This is a schematic diagram of the structure of the first part of the housing provided in an embodiment of this application.

[0047] Figure 6 This is a schematic diagram of a dual-gold stent provided in an embodiment of this application.

[0048] Figure 7 for Figure 5 Enlarged view of point A in the middle.

[0049] Figure 8 This is a schematic diagram of the structure of the second part of the housing provided in an embodiment of this application.

[0050] The attached figures are labeled as follows:

[0051] 1. Shell; 11. First part; 111. Receiving groove; 112. Positioning boss; 113. Baffle; 114. First limiting groove; 1141. Guide bevel; 1142. Limiting rib; 12. Second part; 121. Second limiting groove;

[0052] 2. Conductive system; 21. First stationary contact; 211. First contact section; 2112. First stationary contact; 212. First current-conducting section;

[0053] 22. Second stationary contact; 221. Second contact segment; 2211. Second stationary contact; 2212. First end; 2213. Second end; 222. Second guide segment; 223. Second guide arc segment; 2231. Arc extinguishing segment; 22311. Positioning groove; 2232. Circular arc guide segment; 2233. Sloping arc-inducing segment;

[0054] 23. Moving contact; 231. First moving contact arm; 2311. First moving contact point; 232. Second moving contact arm; 2321. Second moving contact point; 233. Connecting part;

[0055] 24. First terminal block; 25. Second terminal block;

[0056] 26. Bimetallic assembly; 261. Bimetallic part; 262. Bimetallic bracket; 2621. Limiting end; 26211. Body; 26212. Lug; 26213. V-groove; 2622. Welding end; 2623. Bending part; 263. Adjusting screw; 264. First connecting wire; 265. Second connecting wire;

[0057] 3. Arc-extinguishing chamber; 4. Magnetic assembly;

[0058] D1, First Direction; D2, Second Direction; D3, Third Direction. Detailed Implementation

[0059] 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.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] The present application will be described in detail below with reference to the accompanying drawings.

[0066] Figure 1 This is a schematic diagram of the structure of the double-break circuit breaker provided in the embodiments of this application. Figure 2 This is a schematic diagram of the conductive system in a double-break circuit breaker.

[0067] Please refer to Figure 1 and Figure 2 The double-break circuit breaker provided in this application includes a conductive system 2, which includes a first stationary contact 21, a second stationary contact 22, a moving contact 23, a first terminal block 24, and a second terminal block 25.

[0068] The first stationary contact 21 includes a first contact segment 211 and a first flow guiding segment 212, and the second stationary contact 22 includes a second contact segment 221 and a second flow guiding segment 222. The first contact segment 211 and the second contact segment 221 are arranged side by side along a first direction D1 and both extend along a second direction D2. The first flow guiding segment 212 extends along a third direction D3 and is connected to one side of the first contact segment 211.

[0069] The second guide section 222 extends along the third direction D3 and is connected to the side of the second contact section 221 away from the first guide section 212.

[0070] The first direction D1, the second direction D2, and the third direction D3 are perpendicular to each other.

[0071] Along the third direction D3, a first stationary contact 2112 is provided on the side of the first contact segment 211 away from the first guide segment 212, and a second stationary contact 2211 is provided on the side of the second contact segment 221 away from the first guide segment 212.

[0072] The moving contact 23 is located on the side away from the first guide section 212 of the first stationary contact 2112 and the second stationary contact 2211. The moving contact 23 includes a first moving contact arm 231, a second moving contact arm 232 integrally formed, and a connecting part 233 connecting the first moving contact arm 231 and the second moving contact wall. The first moving contact arm 231 is provided with a first moving contact 2311 opposite to the first stationary contact 2112, and the second moving contact arm 232 is provided with a second moving contact opposite to the second stationary contact 2211.

[0073] The first terminal 24 is connected to the end of the first guide section 212 away from the second guide section 222, and the second terminal 25 is connected to the end of the second guide section 222 away from the first guide section 212.

[0074] Specifically, please refer to Figure 1 and Figure 2 In this application, the conductive system 2 includes a first stationary contact 21, a second stationary contact 22, and a moving contact 23. When the double-break circuit breaker is closed, the first moving contact 2311 of the moving contact 23 contacts the first stationary contact 2112 of the first stationary contact 21. At the same time, the second moving contact of the moving contact 23 contacts the second stationary contact 2211 of the second stationary contact 22. The first stationary contact 21 and the second stationary contact 22 are connected in series through the moving contact 23. When the double-break circuit breaker trips, the first moving contact 2311 of the moving contact 23 separates from the first stationary contact 2112 of the first stationary contact 21. At the same time, the second moving contact of the moving contact 23 separates from the second stationary contact 2211 of the second stationary contact 22. The main circuit of the double-break circuit breaker is disconnected at both the first stationary contact 2112 and the second stationary contact 2211. Thus, compared with the single-break circuit breaker, the double-break circuit breaker can improve the current segmentation capability.

[0075] This application, based on the existing single-break circuit breaker, adds a second stationary contact 22 arranged side-by-side with the first stationary contact 21 in the first direction D1, and positions the moving contact 23 on the same side of the first stationary contact 2112 and the second stationary contact 2211. The closing and opening of the circuit breaker are achieved through the contact and separation between the same moving contact 23 and the two stationary contacts. The contact structure is relatively simple and easy to implement.

[0076] Furthermore, in this application, the first stationary contact 21 includes a first contact segment 211 and a first flow guiding segment 212, and the second stationary contact 22 includes a second contact segment 221 and a second flow guiding segment 222. The first contact segment 211 and the second contact segment 221 are arranged side by side along a first direction D1 and both extend along a second direction D2. The first flow guiding segment 212 extends along a third direction D3 and is connected to one side of the first contact segment 211. The second flow guiding segment 222 extends along a third direction D3 and is connected to the side of the second contact segment 221 away from the first flow guiding segment 212. The first stationary contact 2112 is provided on the side of the first contact segment 211 away from the first flow guiding segment 212, and the second stationary contact 2212 is provided on the side of the second contact segment 221 away from the first flow guiding segment 212. The moving contact 23 is located on the side of the first stationary contact 2112 and the second stationary contact 2211 away from the first flow guiding segment 212. The first terminal 24 is connected to the end of the first current-conducting section 212 away from the second current-conducting section 222, and the second terminal 25 is connected to the end of the second current-conducting section 222 away from the first current-conducting section 212. Thus, in the layout of the conductive system 2 of this application, along the third direction D3, current can enter the double-break circuit breaker from either the first terminal 24 or the second terminal 25, and exit from the other terminal. The overall layout of the conductive system 2 is similar to that of existing single-break circuit breakers; therefore, the overall size of the double-break circuit breaker is not significantly increased, and the double-break circuit breaker has a smaller volume.

[0077] It should be noted that in this application, the first contact segment 211 and the second contact segment 221 extend along the second direction D2, which does not mean that the first contact segment 211 and the second contact segment 221 necessarily extend along a straight line. Rather, from the perspective of the whole, they extend along the second direction D2, but the extension path is not necessarily a straight line, but can also be a curve.

[0078] It should also be noted that in this application, the extension of the first guide segment 212 and the second guide segment 222 along the third party to D3 does not mean that the extension path is a straight line. Rather, from an overall perspective, it extends towards the third party to D3, and the specific extension path can also be a curve.

[0079] Please continue to refer to this. Figures 1 to 2 It should also be noted that, in one embodiment of this application, the first current-conducting section 212 may be a wire that only has a conductive function, or it may be a coil in the electromagnetic component 4 used for tripping under overload current.

[0080] Figure 3 This is a schematic diagram of the combined structure of the conductive system 2 and the arc-extinguishing chamber 3. Figure 4 for Figure 1 , Figure 2 , Figure 3A schematic diagram of the structure of the second stationary contact 22. Please refer to the following: Figures 1 to 4 In some embodiments of this application, the double-break circuit breaker includes an arc-extinguishing chamber 3. Along a third direction D3, the arc-extinguishing chamber 3 is disposed on the side of the first stationary contact 2112 and the second stationary contact 2211 near the first terminal 24. The inlet of the arc-extinguishing chamber 3 faces the first contact segment 211 and the second contact segment 221. The second stationary contact 22 also includes a second arc-guiding segment 223, which is integrally formed with the second contact segment 221. The second arc-guiding segment 223 connects to the side of the second contact segment 221 away from the second current-guiding segment 222 and extends to the top of the arc-extinguishing chamber 3, forming an arc-extinguishing gap with the arc-extinguishing grid of the arc-extinguishing chamber 3.

[0081] In this way, when the second moving contact 2321 separates from the second stationary contact 2211, part of the arc can enter the arc extinguishing gap along the second arc guide segment 223. The arc extinguishing gap has the function of interrupting the arc, thus improving the arc extinguishing capability of the arc extinguishing chamber 3, and thereby improving the working reliability of the double-break circuit breaker.

[0082] Please refer to Figure 3 and Figure 4 In some embodiments of this application, along the second direction D2, the second contact segment 221 includes a first end 2212 and a second end 2213 opposite to each other, with the second end 2213 located between the top and bottom of the arc-extinguishing chamber 3. The second stationary contact 2211 is located between the first end 2212 and the second end 2213.

[0083] The second guide section 222 is connected to the first end 2212, and the second guide arc section 223 is connected to the second end 2213.

[0084] The second arc guide segment 223 includes an arc extinguishing sub-segment 2231, a circular arc guide segment 2232, and a ramp arc-inducing segment 2233. The arc extinguishing sub-segment 2231 is located at the top of the arc extinguishing chamber 3, forming an arc extinguishing gap between itself and the top of the arc extinguishing chamber 3. One end of the circular arc guide segment 2232 is connected to the second end 2213, and the other end of the circular arc guide segment 2232 is smoothly connected to the arc extinguishing sub-segment 2231 through the ramp arc-inducing segment 2233.

[0085] Specifically, in this embodiment, the second contact segment 221 includes a first end 2212 and a second end 2213, with the second stationary contact 2211 located between the first end 2212 and the second end 2213. The second current-guiding segment 222 and the second arc-guiding segment 223 are located at opposite ends of the second contact segment 221. Thus, when the second moving contact 2321 separates from the second stationary contact 2211, the second arc-guiding segment 223 guides the electric arc from the second stationary contact 2211 toward the arc-extinguishing chamber 3, thereby reducing the ablation of the second current-guiding segment 222 by the electric arc.

[0086] Furthermore, in this embodiment, the second arc-guiding segment 223 includes an arc-extinguishing sub-segment 2231, a circular arc-guiding segment 2232, and a ramp arc-guiding segment 2233. The circular arc-guiding segment 2232 and the ramp arc-guiding segment 2233 mainly serve to guide the movement of the electric arc, guiding part of the electric arc from the second stationary contact 2211 to the arc-extinguishing chamber 3 and the arc-extinguishing gap formed between the arc-extinguishing chamber 3 and the arc-extinguishing sub-segment 2231, thus helping to extinguish the electric arc.

[0087] Please continue to refer to this. Figure 3 and Figure 4 It should be noted that, in this application, the top of the arc-extinguishing chamber 3 is the end of the arc-extinguishing chamber 3 near the second stationary contact 2211 in the second direction D2, and the other end of the arc-extinguishing chamber 3 in the second direction D2 is the bottom of the arc-extinguishing chamber 3. Generally, the arc-extinguishing chamber 3 includes a plurality of arc-extinguishing grid plates arranged along the second direction D2, and the arc-extinguishing sub-segment 2231 forms an arc-extinguishing gap with the top arc-extinguishing grid plate.

[0088] Please continue to refer to this. Figure 4 In some embodiments of this application, the arc extinguishing segment 2231 includes a first dimension and a second dimension. The first dimension is the dimension of the arc extinguishing segment 2231 along the first direction D1, and the second dimension is the dimension of the arc extinguishing segment 2231 along the second direction D2. The first dimension is larger than the second dimension.

[0089] Specifically, in this embodiment, the first dimension of the arc-extinguishing segment 2231 is larger than the second dimension. Thus, the arc-extinguishing segment 2231 has a flat structure as a whole, and the contact area between the arc-extinguishing segment 2231 and the electric arc is larger, which is beneficial for arc extinguishing.

[0090] Please continue to refer to this. Figure 1 , Figure 2 and Figure 4 In some embodiments of this application, the second guide section 222 is located on the side of the second contact section 221 away from the first contact section 211. The second guide section 222 includes a third dimension and a fourth dimension. The third dimension is the dimension of the second guide section 222 along the first direction D1, and the fourth dimension is the dimension of the second guide section 222 along the second direction D2. The third dimension is smaller than the fourth dimension.

[0091] In this embodiment, the second current-conducting section 222 is located on the side of the second contact section 221 away from the first contact section 211. This helps to increase the insulation distance between the second current-conducting section 222 and the first contact section 211, maintaining the normal function of the main circuit of the double-break circuit breaker. Furthermore, in this embodiment, the third dimension of the second current-conducting section 222 is smaller than the fourth dimension, which helps to reduce the size of the double-break circuit breaker in the first direction D1.

[0092] also, Figure 5For a structural schematic diagram of the first part 11 of the housing 1 provided in the embodiments of this application, please refer to... Figure 1 , Figure 3 Figure 4 and Figure 5 The double-break circuit breaker includes a housing 1, which comprises a first part 11 and a second part that are interlocked along a first direction D1. A conductive system 2 and an arc-extinguishing chamber 3 are located within the cavity formed by the first part 11 and the second part. The first part 11 is located on the side of the second stationary contact 22 away from the first stationary contact 21. The first part 11 is provided with a receiving groove 111 for accommodating a second current-conducting section 222. The second current-conducting section 222 is embedded in the receiving groove 111, thus facilitating the installation of the second stationary contact 22 and its positioning along the first direction D1.

[0093] Please continue to refer to this. Figure 1 , Figure 3 Figure 4 and Figure 5 In some embodiments of this application, a first positioning structure is provided between the arc extinguishing segment 2231 and the first part 11 along the first direction D1. The first positioning structure is used for positioning the second stationary contact 22 on the third direction D3 of the second part 12.

[0094] The first positioning structure includes a positioning groove 22311 and a positioning boss 112 that can be interlocked with each other. One of the positioning groove 22311 and the positioning boss 112 is located in the arc extinguishing segment 2231, and the other is located in the first part 11.

[0095] Specifically, in a double-break circuit breaker, the position of the second stationary contact 22 on the third direction D3 is a critical position. The accuracy of the position of the second stationary contact 22 on the third direction D3 affects the reliability of the contact between the moving contact 23 and the second stationary contact 22. This application provides a first positioning structure between the arc extinguishing section 2231 and the first part 11. The position of the second stationary contact 22 on the third direction D3 is defined by the first positioning structure, thereby improving the reliability of the contact between the second stationary contact 22 and the moving contact 23.

[0096] Please combine Figure 4 and Figure 5 In some embodiments of this application, a positioning groove 22311 is provided on the side of the arc extinguishing segment 2231 near the first part 11, and a positioning boss 112 is provided at the corresponding location of the first part 11. During installation, the positioning groove 22311 and the positioning boss 112 are inserted into each other.

[0097] For example, in some embodiments of this application, the positioning groove 22311 is a rectangular groove, and the positioning boss 112 is cuboid in shape.

[0098] Please continue to refer to this. Figure 4In some embodiments of this application, the second stationary contact 22 is an integral structure, the second contact segment 221, the second arc segment 223, and the second flow guiding segment 222 have the same thickness, and the second contact segment 221 and the second arc segment 223 have the same width.

[0099] Please refer to Figure 1 , Figure 2 , Figure 3 and Figure 5 In some embodiments of this application, the double-break circuit breaker further includes a bimetallic component 26 located within the housing 1.

[0100] Along the third direction D3, the bimetallic component 26 is disposed on the side of the moving contact 23 away from the first stationary contact 2112 and the second stationary contact 2211. Inside the housing 1, the bimetallic component 26 is isolated from the area where the electric arc is located by a baffle 113 fixed to the housing 1.

[0101] Specifically, the bimetallic component 26 is the core component for overload protection in a double-break circuit breaker. Its main function is to detect overload current and trigger the tripping mechanism to disconnect the circuit through mechanical deformation, thereby preventing the circuit from overheating and catching fire due to prolonged overcurrent.

[0102] In this embodiment, by providing a baffle 113 on the housing 1 to isolate the bimetallic component 26 from the arc area, it is possible to prevent the arc from burning the bimetallic component 26 and improve the safety and reliability of the bimetallic component 26 in operation.

[0103] In this embodiment, the area where the electric arc is located mainly refers to the arc initiation area, which is the area where an electric arc is likely to occur when the moving contact 23 separates from the first stationary contact 21 and the second stationary contact 22.

[0104] For example, along the third direction D3, a baffle 113 is disposed on the side of the moving contact 23 away from the first stationary contact 21 and the second stationary contact 22, and the baffle 113 covers the moving contact 23. And in the second direction D2, the baffle 113 extends to the bottom of the housing 1.

[0105] Figure 6 This is a schematic diagram of a structure of the dual-gold stent 262 provided in an embodiment of this application. Please refer to it. Figure 1 , Figure 2 and Figure 6 In one embodiment of this application, the bimetallic component 26 includes a bimetallic part 261, a bimetallic bracket 262, and an adjusting screw 263.

[0106] The bimetallic bracket 262 includes a limiting end 2621, a bent portion 2623, and a welding end 2622 connected together. The limiting end 2621 mates with a limiting groove on the housing 1. The welding end 2622 is welded to the surface of the bimetallic component 261. An adjustment gap is formed between the limiting end 2621 and the bimetallic component 261 through the bent portion 2623.

[0107] The adjusting screw 263 is threaded onto the housing 1 and is located on the side of the bimetallic part 261 away from the bimetallic bracket 262. The head of the adjusting screw 263 is directly opposite the end of the bimetallic part 261 that is welded to the bimetallic bracket 262.

[0108] Specifically, the bimetallic component 261 is the core component of the bimetallic assembly 26, and the accuracy of its position directly affects the reliability of the overcurrent protection.

[0109] In this embodiment, the bimetallic bracket 262 is one of the components that determines the position of the bimetallic component 261. The bimetallic bracket 262 includes a limiting end 2621, and the installation position of the bimetallic bracket 262 can be determined by a limiting groove on the housing 1 that matches the shape of the limiting end 2621. The bimetallic bracket 262 includes a welding end 2622, which can be fixed to one end of the bimetallic component 261. Thus, after the bimetallic bracket 262 is installed on the housing 1 via the limiting end 2621, the initial position of the bimetallic component 261 is determined. Based on this, the position of the bimetallic component 261 can be further fine-tuned by adjusting the adjusting screw 263, thereby improving the positional accuracy of the bimetallic component 261. In addition, the bimetallic bracket 262 and the adjusting screw 263 are located on opposite sides of the bimetallic component 261, which can stably provide support for the bimetallic component 261.

[0110] Please continue to refer to this. Figure 1 , Figure 2 , Figure 3 and Figure 4 In some embodiments of this application, the bimetallic assembly 26 includes, in addition to the bimetallic bracket 262 and the bimetallic component 261, a first connecting wire 264 and a second connecting wire 265. The bimetallic component 261 is electrically connected to the second current-conducting section 222 via the first connecting wire 264, and the bimetallic component 261 is electrically connected to the terminal block at the second terminal 25 via the second connecting wire 265. During operation, the bimetallic bracket 262 and the adjusting screw 263 support the bimetallic component 261 at one end, and in the event of overcurrent, the other end of the bimetallic component 261 triggers a tripping mechanism to disconnect the main circuit.

[0111] Please continue to refer to this. Figure 3 and Figure 4In one embodiment of this application, the second guide section 222 extends along a third direction D3, and bends towards a second direction D2 at one end of the second guide section 222 near the second terminal 25, with the bend being a rounded transition. This helps to increase the overall length of the second guide section 222, facilitating the electrical connection between the second guide section 222 and the first connecting wire 264.

[0112] In addition, a convex point can be provided at the connection position between the second guide section 222 and the first connecting wire 264 to improve the welding reliability of the second guide section 222 and the first connecting wire 264. Figure 7 for Figure 5 Enlarged view of point A in the middle. Figure 8 Please refer to the schematic diagram of a structure of the second part 12 of the shell 1 provided in the embodiment of this application. Figure 1 , Figure 5 , Figure 6 , Figure 7 and Figure 8 In some embodiments of this application, the housing 1 includes a first portion 11 and a second portion 12 that are engaged along a first direction D1.

[0113] The limiting end 2621 includes a body 26211 and lugs 26212 disposed on both sides of the body 26211.

[0114] The limiting groove includes a first limiting groove 114 and a second limiting groove 121. The first limiting groove 114 is disposed in the first part 11, and the second limiting groove 121 is disposed in the second part 12.

[0115] The lug 26212 on one side of the limiting end 2621 is inserted into the first limiting groove 114, and the lug 26212 on the other side of the limiting end 2621 is inserted into the second limiting groove 121.

[0116] A V-groove 26213 is also provided at the connection between the lug 26212 and the body 26211.

[0117] Specifically, during installation, the bimetallic component 262 can engage with the first limiting groove 114 and the second limiting groove 121 on the housing 1 via the lugs 26212 on both sides, thus initially determining the position of the bimetallic component 261. After initial installation, the adjusting screw 263 is used to press against the bimetallic component 261 from the other side, thus providing effective support for the bimetallic component 261.

[0118] During the adjustment of the position of the bimetallic component 261 by the adjusting screw 263, the bimetallic bracket 262 will also be subjected to corresponding resistance. The V-groove 26213 helps to improve the toughness of the welded end 2622 and reduce the adjustment resistance.

[0119] Please continue to refer to this. Figure 7 and Figure 8 In some embodiments of this application, the openings of the first limiting groove 114 and the second limiting groove 121 are provided with guide bevels 1141, and the circumferential groove walls of the first limiting groove 114 and the second limiting groove 121 are provided with limiting ribs 1142 extending along the groove depth direction.

[0120] Specifically, guide bevels 1141 are provided at the openings of the first limiting groove 114 and the second limiting groove 121 to facilitate the insertion of the limiting end 2621 of the bimetallic bracket 262. The annular groove walls of the first limiting groove 114 and the second limiting groove 121 are provided with limiting ribs 1142 extending along the groove depth direction. This can improve the tightness of the fit between the limiting end 2621 and the first limiting groove 114 and the second limiting groove 121, so that the limiting end 2621 and the first limiting groove 114 and the second limiting groove 121 are interference-fitted, preventing the bimetallic bracket 262 from falling off.

[0121] 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.

[0122] 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 in that, It includes a conductive system, which includes a first stationary contact, a second stationary contact, a moving contact, a first terminal block, and a second terminal block; The first stationary contact includes a first contact segment and a first flow guiding segment, and the second stationary contact includes a second contact segment and a second flow guiding segment; the first contact segment and the second contact segment are arranged side by side along a first direction and both extend along a second direction; the first flow guiding segment extends along a third direction and is connected to one side of the first contact segment; the second flow guiding segment extends along a third direction and is connected to the side of the second contact segment away from the first flow guiding segment; the first direction, the second direction, and the third direction are perpendicular to each other; Along a third direction, a first stationary contact is provided on the side of the first contact segment away from the first flow guide segment, and a second stationary contact is provided on the side of the second contact segment away from the first flow guide segment; the moving contact is located on the side of the first stationary contact and the second stationary contact away from the first flow guide segment, and the moving contact includes an integrally formed first moving contact arm, a second moving contact arm, and a connecting part connecting the first moving contact arm and the second moving contact wall, the first moving contact arm is provided with a first moving contact opposite to the first stationary contact, and the second moving contact arm is provided with a second moving contact opposite to the second stationary contact; The first terminal is connected to the end of the first guide section away from the second guide section, and the second terminal is connected to the end of the second guide section away from the first guide section.

2. The double-break circuit breaker according to claim 1, characterized in that, The double-break circuit breaker includes an arc-extinguishing chamber, and along the third direction, the arc-extinguishing chamber is disposed on the side of the first stationary contact and the second stationary contact near the first terminal, and the inlet of the arc-extinguishing chamber faces the first contact segment and the second contact segment. The second stationary contact also includes a second arc-guiding segment, which is integrally formed with the second contact segment. The second arc-guiding segment is connected to the side of the second contact segment away from the second flow-guiding segment and extends to the top of the arc-extinguishing chamber, forming an arc-extinguishing gap with the arc-extinguishing grid plate of the arc-extinguishing chamber.

3. The double-break circuit breaker according to claim 2, characterized in that, Along the second direction, the second contact segment includes a first end and a second end opposite to each other, the second end being located between the top and bottom of the arc-extinguishing chamber; the second stationary contact is located between the first end and the second end; The second guide segment is connected to the first end, and the second guide arc segment is connected to the second end; The second arc guide segment includes an arc extinguishing sub-segment, a circular arc guide segment, and a ramp arc-inducing segment. The arc extinguishing sub-segment is located at the top of the arc extinguishing chamber, forming the arc extinguishing gap between it and the top of the arc extinguishing chamber. One end of the circular arc guide segment is connected to the second end, and the other end of the circular arc guide segment is smoothly connected to the arc extinguishing sub-segment through the ramp arc-inducing segment.

4. The double-break circuit breaker according to claim 3, characterized in that, The arc-extinguishing segment includes a first dimension and a second dimension. The first dimension is the dimension of the arc-extinguishing segment along the first direction, and the second dimension is the dimension of the arc-extinguishing segment along the second direction. The first dimension is larger than the second dimension.

5. The double-break circuit breaker according to claim 3, characterized in that, The second flow guide section is located on the side of the second contact section away from the first contact section. The second flow guide section includes a third dimension and a fourth dimension. The third dimension is the dimension of the second flow guide section along the first direction, and the fourth dimension is the dimension of the second flow guide section along the second direction. The third dimension is smaller than the fourth dimension.

6. The double-break circuit breaker according to claim 5, characterized in that, The double-break circuit breaker includes a housing, which includes a first part and a second part that are fastened together along a first direction; the conductive system and the arc-extinguishing chamber are located in the cavity formed by the first part and the second part; wherein, the first part is located on the side of the second stationary contact away from the first stationary contact, and the first part is provided with a receiving groove for accommodating the second flow guide section, and the second flow guide section is embedded in the receiving groove.

7. The double-break circuit breaker according to claim 6, characterized in that, Along the first direction, a first positioning structure is provided between the arc-extinguishing sub-segment and the first part, and the first positioning structure is used for positioning the second stationary contact in the third direction of the second part; The first positioning structure includes a positioning groove and a positioning boss that can be inserted into each other. One of the positioning groove and the positioning boss is disposed in the arc extinguishing segment, and the other is disposed in the first part.

8. The double-break circuit breaker according to any one of claims 1 to 5, characterized in that, The double-break circuit breaker also includes a housing, the conductive system is located within the housing, and the conductive system also includes a bimetallic component; Along the third direction, the bimetallic component is disposed on the side of the moving contact away from the first stationary contact and the second stationary contact; inside the housing, the bimetallic component is isolated from the area where the electric arc is located by a baffle fixed to the housing.

9. The double-break circuit breaker according to claim 8, characterized in that, The bimetallic assembly includes a bimetallic component, a bimetallic bracket, and an adjusting screw; The dual-metal bracket as a whole includes a limiting end, a bending part and a welding end connected together; The limiting end engages with the limiting groove on the housing; The welding end is welded to the surface of the bimetallic component; The limiting end forms an adjustment gap between the bent portion and the bimetallic component; The adjusting screw is threaded onto the housing and is located on the side of the bimetallic component away from the bimetallic bracket. The head of the adjusting screw is directly opposite the end of the bimetallic component that is welded to the bimetallic bracket.

10. The double-break circuit breaker according to claim 9, characterized in that, The housing includes a first part and a second part that are fastened together along a first direction, and the conductive system is located in the cavity formed by the first part and the second part; The limiting end includes a body and lugs disposed on both sides of the body; The limiting groove includes a first limiting groove and a second limiting groove, wherein the first limiting groove is disposed in the first part and the second limiting groove is disposed in the second part; The lug on one side of the limiting end is inserted into the first limiting groove, and the lug on the other side of the limiting end is inserted into the second limiting groove. A V-groove is provided at the connection between the lug and the body.

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