A circuit breaker

Abstract

A kind of circuit breaker belongs to switch electric appliance technical field.It includes base, contact system arranged in base, trip with electric conduction component and external busbar group, contact system has along the width direction of base arrangement, external busbar group includes the first external busbar arranged in one end of base and the second external busbar arranged in the other end of base, characterized by: in the width direction of base arrangement of contact system group, it is connected by two adjacent contact systems in parallel circuit and constitutes parallel contact system group, one end of parallel contact system group is connected with the first external busbar, the other end is connected with one end of electric conduction component, and the other end of electric conduction component is connected with the second external busbar.Advantages: effectively solve the problem of two poles parallel current imbalance, can ensure the stable and reliable operation of circuit breaker.

Description

Technical Field

[0001] This utility model belongs to the field of switchgear technology, specifically relating to a circuit breaker. Background Technology

[0002] In modern power systems, the increasing demands for the safety, stability, and efficiency of power distribution and control are the result of multiple technological, economic, and social factors. Taking the four-pole circuit breaker as an example, as a crucial piece of equipment in the low-voltage electrical field, it is widely used in power systems, playing a vital role in protecting circuit equipment and controlling power transmission.

[0003] With the continuous growth of electricity demand and the widespread application of various high-power equipment in industrial, commercial, and residential sectors, higher requirements are placed on the current carrying capacity and performance of circuit breakers. In many practical applications, such as large data centers, industrial automated production lines, and power distribution systems in high-rise buildings, existing circuit breakers are limited by the current range of their own frame structures, making it difficult to meet the ever-increasing demand for high current.

[0004] To overcome the aforementioned limitations, connecting two circuit breakers in parallel to obtain a larger current capacity is an effective option, as it can double the total current carrying capacity of the circuit breakers to meet the power supply requirements of the current load. For example, in high-load environments such as the aforementioned large data centers, using two-pole parallel four-pole circuit breakers can improve power supply reliability and current capacity, ensuring sufficient power for high-power equipment and guaranteeing the normal operation of the data center.

[0005] However, existing technologies for applying two-pole parallel four-pole circuit breakers have certain limitations due to manufacturing constraints. Specifically, after a short circuit, the resistance of each pole in the main connection area of ​​the circuit breaker is not entirely the same. This resistance difference can lead to an imbalance in the actual current flowing through the two parallel poles of the same polarity. When this current imbalance occurs, even if the main circuit current is normal, it can still cause reduced tripping sensitivity or false tripping of the circuit breaker, severely impacting the stability and reliability of the power system. Utility Model Content

[0006] The objective of this invention is to provide a circuit breaker that helps to balance the parallel currents of two poles, thereby ensuring the stability and reliability of the power system.

[0007] The present invention achieves its objective as follows: a circuit breaker includes a base, a contact system disposed within the base, a trip unit including a conductive component, and an external busbar group disposed on the base and electrically connected to the contact system and the trip unit respectively. The contact system comprises a group arranged along the width direction of the base. The external busbar group includes an external busbar disposed at one end of the base and a second external busbar disposed at the other end of the base. The feature is that in the group of contact systems arranged along the width direction of the base, adjacent contact systems are connected in parallel to form a parallel contact system group. One end of the parallel contact system group is connected to a first external busbar, and the other end is connected to one end of the conductive component, while the other end of the conductive component is connected to the second external busbar.

[0008] Preferably, the conductive component includes a first conductive plate, which includes a first connecting plate, a second connecting plate, and a transition connecting plate. The first and second connecting plates are parallel to each other in the length direction and are staggered in the front-back direction. The transition connecting plate is connected between the first and second connecting plates at a position above the middle of the length direction corresponding to the first and second connecting plates.

[0009] Preferably, the trip unit further includes a bracket, an iron core, a bimetallic element, an armature, and a spring. The bracket, iron core, and bimetallic element are riveted to the transition connecting plate of the first conductive plate. The armature is rotatably mounted on the bracket. One end of the spring is hung on the armature, and the other end is hung on the bracket.

[0010] Preferably, the conductive component further includes a first connecting plate and a second connecting plate. The first connecting plate is connected to the moving contact of the contact system in the structural system of the contact system. The second connecting plate is connected to the second external busbar. The first connecting plate is connected to the first connecting plate of the first conductive plate, and the second connecting plate is connected to the second connecting plate of the first conductive plate.

[0011] Preferably, the first connecting folding plate is a pair or a single plate; similarly, the second connecting folding plate is also a pair or a single plate.

[0012] Preferably, the conductive component further includes a thermal component, which includes a first wall panel, a second wall panel, and a wall panel transition connecting plate. The first and second wall panels are parallel to each other in the length direction and are arranged such that the first wall panel is higher than the second wall panel or the two wall panels are at the same height in the height direction. The wall panel transition connecting plate is connected between the upper parts of the first wall panel and the second wall panel in the length direction, and a clearance opening is provided on the wall panel transition connecting plate, which extends downward to the first wall panel.

[0013] The technical advantage of the solution provided by this utility model is that: in a group of contact systems arranged in the width direction of the base, two adjacent contact systems are connected in parallel to form a parallel contact system group. One end of the parallel contact system group is connected to the first external busbar, and the other end is connected to one end of the conductive component. The other end of the conductive component is connected to the second external busbar, which helps to balance the parallel current of the two poles and thus ensure the stability and reliability of the power system. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall assembly of the present invention after the cover has been removed; Figure 2 For the present utility model Figure 1 A schematic diagram of the internal assembly after removing base 1; Figure 3 This utility model Figure 1 and Figure 2 The diagram shows a first embodiment of the trip unit. Figure 4 This utility model Figure 3 Exploded view; Figure 5 This utility model Figure 1 and Figure 2 The diagram shows a second embodiment of the trip unit. Figure 6 for Figure 5 An explosion diagram.

[0015] In the figure: 1. Base; 2. Contact system, 21. First contact system, 211. First stationary contact assembly, 212. First moving contact assembly, 22. Second contact system, 221. Second stationary contact assembly, 222. Second moving contact assembly; 3. Trip unit, 31. Conductive component, 311. Thermal element, 3111. First connecting plate, 3112. Second connecting plate, 3113. Transition connecting plate, 312. Thermal component, 3121. First wall plate, 3122. Second wall plate, 3123. Wall plate transition connecting plate, 31231. Clearance opening, 313. First connecting folding plate, 314. Second connecting folding plate, 32. Bracket, 33. Iron core, 34. Bimetallic element, 35. Armature, 36. Spring; 4. Switching mechanism; 5. External busbar assembly, 5a. External busbar, 5b. Terminal block; 6. Fastener. Detailed Implementation

[0016] The specific embodiments of this utility model are described in detail below with reference to the accompanying drawings. However, the description of the embodiments is not a limitation on the technical solution. Any formal but not substantive changes made based on the concept of this utility model should be considered within the protection scope of this utility model.

[0017] In the following description, all directional (or orientational) concepts involving up, down, left, right, front, and back refer to the position of the figure being described, and are intended to facilitate public understanding. Therefore, they should not be construed as a special limitation on the technical solution provided by this utility model.

[0018] Example 1: Please refer to Figures 1 to 4 The diagram shows a base 1, a contact system 2 disposed within the base 1, a trip unit 3 having a conductive component 31, and an external busbar assembly 5 disposed on the base 1 and electrically connected to the contact system 2 and the trip unit 3, respectively. The contact system 2 has one assembly arranged along the width direction of the base 1. The external busbar assembly 5 includes a first external busbar 5a disposed at one end of the base 1 and a second external busbar 5b disposed at the other end of the base 1. Figure 1 The switch mechanism 4 is also shown.

[0019] The key technical points of the technical solution provided by this utility model are as follows: In a group of contact systems 2 arranged in the width direction of the aforementioned base 1, two adjacent contact systems are connected in parallel to form a parallel contact system group. The aforementioned first external busbar 5a is connected to the stationary contact assembly of the parallel contact system group. The moving contact assembly of the aforementioned parallel contact system group is connected to one end of the conductive component 31, and the other end of the conductive component 31 is connected to the aforementioned second external busbar 5b.

[0020] Based on the above explanation and in combination Figure 1 and Figure 2 As shown, this utility model relates to a four-pole circuit breaker, and according to professional knowledge, it is a four-pole DC circuit breaker. Furthermore, since it is a four-pole DC circuit breaker, the number of contact systems 2 is directly proportional to the number of poles in the DC circuit breaker; more precisely, there are four contact systems 2. Therefore, for better understanding, it will be based on... Figure 1 The A, B, C, and N phases are used to describe the four-pole molded case circuit breaker. According to this embodiment of the invention, in addition to the aforementioned base 1, the circuit breaker also has a switching mechanism 4 that provides opening and closing forces. A contact system 2 with contact portions is provided for each phase. This contact system 2 includes a stationary contact assembly fixedly disposed within the base 1 and a moving contact assembly that contacts and separates from the stationary contact assembly. The contact and separation of the moving and stationary contacts in the structural system of the moving and stationary contact assemblies realizes the connection and disconnection of the circuit breaker. The aforementioned trip unit 3 is used to connect to the moving contact assembly in the contact system 2. When there is an overload or interruption current, it is used to detect the fault current and trigger the switching mechanism to disconnect the circuit.

[0021] To meet the high current requirements of the four-pole circuit breaker, the aforementioned first external busbar 5a is connected to the adjacent contact system of the circuit breaker, that is, the incoming terminal of the circuit breaker with phases A and B. The aforementioned second external busbar 5b is connected to the outgoing terminal of the circuit breaker with phases A and B. The A and B phases of the four-pole circuit breaker are connected in parallel. Similarly, the external busbar 5 also connects the C and N phases of the four-pole circuit breaker in parallel.

[0022] This example uses phases A and B of a four-pole circuit breaker; phases C and N follow the same configuration as phases A and B. Please refer to [link to relevant documentation]. Figure 2 and combined Figure 3 , Figure 4 The contact system 2 of the aforementioned circuit breaker is respectively installed in the four phases of the circuit breaker. Phase A is equipped with the first contact system 21 in the parallel contact system group, which includes a first stationary contact assembly 211 and a first moving contact assembly 212. Phase B is equipped with the second contact system 22 in the parallel contact system group, which includes a second stationary contact assembly 221 and a second moving contact assembly 222. One end of the aforementioned external busbar 5a is connected by... Figure 1 and Figure 2 The center position on the right end of the position shown has an external busbar notch that communicates with the outside. Therefore, the external busbar 5a has a U-shaped structure. The two ends of the U-shape are respectively connected to the parts of the first stationary contact assembly 211 and the second stationary contact assembly 221 that extend out of the base 1. The aforementioned first stationary contact assembly 211 and the second stationary contact assembly 221 can be used as the aforementioned incoming line side terminal, that is, the incoming line side terminal and the stationary contact assembly are integrated into one piece.

[0023] Preferably, such as Figure 3 and Figure 4 As shown, the aforementioned conductive component 31 includes a first conductive plate 311, which includes a first connecting plate 3111, a second connecting plate 3112, and a transition connecting plate 3113. The first and second connecting plates 3111 and 3112 are parallel to each other in the length direction and staggered relative to each other in the front-back direction. The transition connecting plate 3113 is connected between the first and second connecting plates 3111 and 3112 at a position above the middle of the length direction corresponding to the first connecting plate 3111 and the second connecting plate 3112. Figure 4 As can be seen from the diagram, the entire first conductive plate 311 is roughly H-shaped, and the first and second connecting plates 3111 and 3112 are both long strips with the same length, but their positions are staggered.

[0024] The aforementioned trip unit 3 also includes a bracket 32, an iron core 33, a bimetallic element 34, an armature 35, and a spring 36. The bracket 32, the iron core 33, and the bimetallic element 34 are sequentially riveted to the aforementioned transition connecting plate 3113 of the first conductive plate 311. The armature 35 is rotatably mounted on the bracket 32. One end of the spring 36 is hung on the armature 35, and the other end is hung on the bracket 32.

[0025] The aforementioned conductive component 31 of the aforementioned trip unit 3 structure system further includes a first connecting plate 313 connected to the moving contact of the contact system of the contact system 2 structure system and a second connecting plate 314 connected to the aforementioned second external busbar 5b. The aforementioned first connecting plate 313 is connected to the first connecting plate 3111 of the aforementioned first conductive plate 311, and the aforementioned second connecting plate 314 is connected to the aforementioned second connecting plate 3112 of the first conductive plate 311.

[0026] In this embodiment and by Figure 4 It is revealed that there is a pair of first connecting folding plates 313 welded to the first conductive plate 311, which correspond to the moving contact assemblies 212 of phase A and phase B respectively. In this embodiment, there is also a pair of second connecting folding plates 314 connected to the second external busbar 5b, which are welded to the second connecting plate 3112 of the first conductive plate 311 respectively. The part of the second connecting folding plate 314 extending out of the base 1 is connected to the second external busbar 5b. The second connecting folding plate 314 can be used as the aforementioned outgoing side terminal, that is, the outgoing side terminal and the second connecting folding plate 314 are integrally constructed.

[0027] Indicated at Figure 4 The pair of fasteners 6 are clearly used to secure the bimetallic element 34, specifically by... Figure 4 As shown, the bimetallic element 34 is fixed at the intersection of the first connecting plate 3111 and the transition connecting plate 3113 by fastener 6. The aforementioned fastener 6 can be a rivet or a screw.

[0028] Example 2: Please refer to Figure 5 and Figure 6 The aforementioned conductive component 31 further includes a heating element 312, which includes a first wall plate 3121, a second wall plate 3122, and a wall plate transition connecting plate 3123. The first and second wall plates 3121 and 3122 are parallel to each other in the length direction and are arranged in the height direction such that the first wall plate 3121 is higher than the second wall plate 3122, but they can also be the same height. The wall plate transition connecting plate 3123 connects the upper parts of the first wall plate 3121 and the second wall plate 3122 in the length direction, and a clearance opening 31231 is provided on the wall plate transition connecting plate 3123, which extends downward to the aforementioned first wall plate 3121.

[0029] In this embodiment, by Figure 5 and Figure 6 As can be seen from the illustration, compared to Embodiment 1, a pair of first connecting folding plates 313 are combined into one piece, and a pair of second connecting folding plates 314 are combined into one piece. The rest is the same as the description of Embodiment 1.

[0030] In summary, the technical solution provided by this utility model effectively solves the problem of unbalanced current in parallel circuits, ensuring stable and reliable operation of the circuit breaker.

Claims

1. A circuit breaker comprising a base (1), a contact system (2) disposed within the base (1), a trip unit (3) including a conductive component (31), and an external busbar group (5) disposed on the base (1) and electrically connected to the contact system (2) and the trip unit (3), wherein the contact system (2) comprises a group arranged along the width direction of the base (1), and the external busbar group (5) comprises an external busbar (5a) disposed at one end of the base (1) and a second external busbar (5b) disposed at the other end of the base (1), characterized in that: in the group of contact systems (2) arranged along the width direction of the base (1), two adjacent contact systems are connected in parallel to form a parallel contact system group, one end of the parallel contact system group is connected to the first external busbar (5a), the other end is connected to one end of the conductive component (31), and the other end of the conductive component (31) is connected to the second external busbar (5b).

2. A circuit breaker according to claim 1, characterized in that: The conductive component (31) includes a first conductive plate (311), which includes a first connecting plate (3111), a second connecting plate (3112), and a transition connecting plate (3113). The first and second connecting plates (3111, 3112) are parallel to each other in the length direction and staggered in the front-back direction. The transition connecting plate (3113) is connected between the first and second connecting plates (3111, 3112) at a position above the middle of the length direction corresponding to the first connecting plate (3111) and the second connecting plate (3112).

3. A circuit breaker according to claim 2, characterized in that: The trip unit (3) further includes a bracket (32), an iron core (33), a bimetallic element (34), an armature (35), and a spring (36). The bracket (32), the iron core (33), and the bimetallic element (34) are riveted to the transition connecting plate (3113) of the first conductive plate (311). The armature (35) is rotatably mounted on the bracket (32). One end of the spring (36) is hung on the armature (35), and the other end is hung on the bracket (32).

4. A circuit breaker according to claim 3, characterized in that: The conductive component (31) further includes a first connecting plate (313) and a second connecting plate (314). The first connecting plate (313) is connected to the moving contact of the contact system of the contact system (2). The second connecting plate (314) is connected to the second external busbar (5b). The first connecting plate (313) is connected to the first connecting plate (3111) of the first conductive plate (311), and the second connecting plate (314) is connected to the second connecting plate (3112) of the first conductive plate (311).

5. A circuit breaker according to claim 4, characterized in that: The first connecting fold plate (313) is either a pair or a single plate; the second connecting fold plate (314) is also either a pair or a single plate.

6. A circuit breaker according to claim 1, characterized in that: The conductive component (31) further includes a heating element (312), which includes a first wall panel (3121), a second wall panel (3122), and a wall panel transition connecting plate (3123). The first and second wall panels (3121, 3122) are parallel to each other in the length direction and are arranged in the height direction such that the first wall panel (3121) is higher than the second wall panel (3122) or the two are at the same height. The wall panel transition connecting plate (3123) is connected between the upper parts of the first wall panel (3121) and the second wall panel (3122) in the length direction, and a clearance opening (31231) is provided on the wall panel transition connecting plate (3123) and the clearance opening (31231) extends downward to the first wall panel (3121).

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