An arc extinguishing structure of a circuit breaker

Abstract

The utility model discloses an arc extinguishing structure of circuit breaker, its technical scheme main points have the circuit breaker body and arc extinguishing part, be provided with wiring end on the circuit breaker body, and the arc extinguishing part is installed at wiring end department, and the arc extinguishing part includes arc extinguishing cover and first louver group and second louver group, and first louver group second louver group along the height direction of arc extinguishing cover arrangement setting, be provided with wiring cavity and partition in the circuit breaker body, and the partition is provided with multiple groups, and the operating cavity is formed between two adjacent partitions, and every operating cavity corresponds a wiring end and an arc extinguishing part, and the fixed structure is set up between the both ends of first louver group and the partition, and this arc extinguishing structure can improve the stability of equipment.

Description

Technical Field

[0001] This utility model relates to an arc-extinguishing structure, and more specifically, to an arc-extinguishing structure for a circuit breaker. Background Technology

[0002] A circuit breaker is a basic low-voltage electrical appliance with overload, short-circuit, and undervoltage protection functions, protecting lines and power sources from damage. It automatically disconnects the circuit when a fault occurs, preventing the accident from escalating and ensuring safe operation.

[0003] The process of circuit breakers connecting and disconnecting current is easily accompanied by the generation and extinguishing of electric arcs. An electric arc is a gas discharge phenomenon that poses a certain hazard to electrical appliances. Arc-extinguishing structures are used to effectively extinguish electric arcs. However, existing circuit breakers have the following problems: 1. Their arc-extinguishing structures vary, but the arc-extinguishing effect is still not ideal, posing potential equipment hazards.

[0004] 2. The existing fixing method is to ensure the stability of the connection by plugging the arc extinguishing cover into the shell and directly plugging the grid plate into the arc extinguishing cover. This connection method is simple. If the connection is not firm during equipment transportation or use, it will affect the subsequent arc extinguishing effect, thus leaving hidden dangers for the use of the circuit breaker. Utility Model Content

[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide an arc extinguishing structure for a circuit breaker, which can improve the stability of the equipment.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an arc-extinguishing structure for a circuit breaker, comprising a circuit breaker body and an arc-extinguishing component, wherein the circuit breaker body is provided with a terminal, the arc-extinguishing component is installed at the terminal, and the arc-extinguishing component comprises an arc-extinguishing cover and a first grid plate group and a second grid plate group, wherein the first grid plate group and the second grid plate group are arranged along the height direction of the arc-extinguishing cover. The circuit breaker body is provided with a wiring cavity and a partition plate. Multiple sets of partition plates are provided, and an operating cavity is formed between two adjacent partition plates. Each operating cavity corresponds to a wiring terminal and an arc extinguishing component. The two ends of the first grid plate group are provided with a fixing structure between them and the partition plate.

[0007] The present invention is further configured such that: the fixing structure includes a mounting groove disposed on the partition plate and mounting blocks disposed at both ends of the first grid plate group, wherein the mounting blocks are inserted into the mounting groove.

[0008] The present invention is further configured such that: a limiting plate for sealing the installation groove is detachably installed on the partition plate, and the limiting plate is configured in a T-shape.

[0009] The present invention is further configured such that: both the first grid plate group and the second grid plate group include multiple grid plate bodies; The second grid group also includes an extension portion, which is disposed on the side of the corresponding grid body near the terminal.

[0010] The present invention is further configured such that: the arc extinguishing cover includes two sets of arc extinguishing plates, and both ends of the grid plate body are provided with plug-in blocks, and the arc extinguishing plates are provided with corresponding plug-in holes.

[0011] The present invention is further configured such that the lower end of the arc-extinguishing plate is L-shaped.

[0012] The present invention is further configured such that the thickness of the grid body of the first grid group is greater than the thickness of the grid body of the second grid group.

[0013] The present invention is further configured such that: multiple sets of mounting blocks are provided, and each mounting block is provided with a limiting groove through which a limiting plate is inserted.

[0014] In summary, this utility model has the following beneficial effects: 1. By utilizing the design of the fixed structure, the connection strength between the arc extinguishing component and the partition plates at both ends is strengthened, thereby ensuring the stability of the equipment during use and transportation.

[0015] 2. During the installation of the arc extinguishing components, the process of inserting the mounting block into the mounting slot has been improved. The mounting slot restricts the mounting block in four directions (front, back, left, and right), thereby improving the stability of the equipment installation.

[0016] 3. When the grid thickness increases from 1.6mm to 2mm, the arc gap dielectric strength recovery rate increases by about 20% and the re-ignition probability decreases by 30% under a current of 380A. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the internal structure of a circuit breaker. Figure 2 A three-dimensional structural diagram of the arc-extinguishing component; Figure 3 for Figure 2 Enlarged view of point A; Figure 4 This is a schematic diagram of the separation structure of the partition plate.

[0018] Reference numerals in the attached drawings: 1. Circuit breaker body; 11. Wiring cavity; 12. Partition plate; 2. Arc extinguishing component; 3. Terminal; 4. Arc extinguishing cover; 41. Arc extinguishing plate; 5. First grid plate group; 51. Grid plate body; 52. Plug-in block; 6. Second grid plate group; 61. Extension; 7. Fixing structure; 71. Mounting groove; 72. Mounting block; 73. Limiting plate; 74. Limiting groove. Detailed Implementation

[0019] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Identical components are indicated by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "upper," and "lower" used in the following description refer to directions in the accompanying drawings, and the terms "bottom surface," "top surface," "inner," and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0020] Reference Figures 1 to 4 As shown, in order to achieve the above objectives, the present invention provides the following technical solution: an arc extinguishing structure for a circuit breaker, comprising a circuit breaker body 1 and an arc extinguishing component 2, wherein a terminal 3 is provided on the circuit breaker body 1, and the arc extinguishing component 2 is installed at the terminal 3. The arc extinguishing component 2 includes an arc extinguishing cover 4 and a first grid plate group 5 and a second grid plate group 6, wherein the first grid plate group 5 and the second grid plate group 6 are arranged along the height direction of the arc extinguishing cover 4. The circuit breaker body 1 is provided with a wiring cavity 11 and a partition plate 12. Multiple sets of partition plates 12 are provided. An operating cavity is formed between two adjacent partition plates 12. Each operating cavity corresponds to a wiring terminal 3 and an arc extinguishing component 2. A fixing structure 7 is provided between the two ends of the first grid plate group 5 and the partition plate 12.

[0021] The design of this utility model utilizes the design of the fixed structure 7 to strengthen the connection between the arc extinguishing component 2 and the two end partition plates 12, thereby ensuring the stability of the equipment during use and transportation.

[0022] This utility model is further configured such that the fixing structure 7 includes a mounting groove 71 disposed on the partition plate 12 and mounting blocks 72 disposed at both ends of the first grid plate group 5, with the mounting blocks 72 inserted into the mounting groove 71. This design, during the installation of the arc-extinguishing component 2, increases the stability of the equipment installation by providing a four-directional constraint on the mounting blocks 72 through the mounting groove 71 during the insertion of the mounting blocks 72 into the mounting groove 71.

[0023] The present invention is further configured such that: a limiting plate 73 for sealing the installation groove 71 is detachably installed on the partition plate 12, and the limiting plate 73 is configured in a T-shape.

[0024] The design of this structure, such as Figure 4As shown, the limiting plate 73 is inserted into the mounting groove 71 and fixed by bolts.

[0025] like Figure 4 The plate body is composed of two sets of limiting plates 73 integrated together. Since both ends of the partition plate 12 are operating cavities, the two limiting plates 73 can be integrated together.

[0026] The limiting plate 73 corresponding to the partition plate 12 on one side is a T-shaped structure.

[0027] The present invention is further configured such that: multiple sets of mounting blocks 72 are provided, and each mounting block 72 is provided with a limiting groove 74 through which the limiting plate 73 is inserted.

[0028] like Figure 3 As shown, a limiting groove 74 is provided at the end of the mounting block 72, such as... Figure 4 As shown, the limiting plate 73 includes a plug-in portion located at the lower end. When the limiting plate 73 is inserted into the mounting groove 71, the plug-in portion can be inserted into the limiting groove 74, thereby improving the installation strength of the arc extinguishing component 2.

[0029] The present invention is further configured such that: the first grid plate group 5 and the second grid plate group 6 each include multiple grid plate bodies 51; The second grid assembly 6 also includes an extension 61, which is disposed on the side of the corresponding grid body 51 near the terminal 3. This structural design effectively improves the arc extinguishing effect, thereby ensuring the stability of arc extinguishing.

[0030] Specifically: When an electric arc occurs, it spreads outwards, first passing through the first grid group 5, achieving a direct and effective arc-extinguishing effect for small arcs. When the arc is larger, it extends upwards again. Because the second grid group 6 extends outwards relative to the first grid group 5, it can fully envelop the arc, thereby achieving a stable arc-extinguishing effect.

[0031] The thickness of the grid body 51 in the first grid group 5 is greater than that in the second grid group 6. The increased thickness of the magnetic material in the grid body 51 near the terminal 3 increases the ferromagnetic content of the arc-guiding path space, thereby enhancing the magnetic blowing force. This design makes it easier for the arc generated by the moving contact to be magnetically drawn into the arc-extinguishing component 2, improving the arc transfer speed.

[0032] When the grid thickness increases from 1.6 mm to 2 mm, the arc gap dielectric strength recovery rate increases by about 20% and the re-ignition probability decreases by 30% at a current of 380 A.

[0033] The present invention is further configured such that: the arc extinguishing cover 4 includes two sets of arc extinguishing plates 41, and both ends of the grid body 51 are provided with plug-in blocks 52, and the arc extinguishing plates 41 are provided with corresponding plug-in holes.

[0034] The present invention is further configured such that the lower end of the arc-extinguishing plate 41 is arranged in an L-shape.

[0035] The design of this structure, such as Figure 2 As shown, it can be adapted to the internal structure of various circuit breaker bodies 1, thereby achieving the effect of convenient installation.

[0036] The above are merely preferred embodiments of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are within its protection scope. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within its protection scope.

Claims

1. An arc-extinguishing structure for a circuit breaker, comprising a circuit breaker body (1) and an arc-extinguishing component (2), wherein the circuit breaker body (1) is provided with a terminal (3), and the arc-extinguishing component (2) is installed at the terminal (3), characterized in that: The arc extinguishing component (2) includes an arc extinguishing cover (4) and a first grid plate group (5) and a second grid plate group (6), wherein the first grid plate group (5) and the second grid plate group (6) are arranged along the height direction of the arc extinguishing cover (4); The circuit breaker body (1) is provided with a wiring cavity (11) and a partition plate (12). The partition plate (12) is provided in multiple sets. An operating cavity is formed between two adjacent partition plates (12). Each operating cavity corresponds to a wiring terminal (3) and an arc extinguishing component (2). The two ends of the first grid plate group (5) are provided with a fixing structure (7) between the partition plate (12) and the partition plate (5).

2. The arc-extinguishing structure of a circuit breaker according to claim 1, characterized in that: The fixing structure (7) includes a mounting groove (71) disposed on the partition plate (12) and mounting blocks (72) disposed at both ends of the first grid plate group (5), wherein the mounting blocks (72) are inserted into the mounting groove (71).

3. The arc-extinguishing structure of a circuit breaker according to claim 2, characterized in that: The partition plate (12) is detachably mounted with a limiting plate (73) for sealing the installation groove (71), and the limiting plate (73) is T-shaped.

4. The arc-extinguishing structure of a circuit breaker according to claim 1, characterized in that: The first grid group (5) and the second grid group (6) each include multiple grid bodies (51); The second grid plate group (6) also includes an extension (61), which is disposed on the side of the corresponding grid plate body (51) near the terminal (3).

5. The arc-extinguishing structure of a circuit breaker according to claim 4, characterized in that: The arc-extinguishing cover (4) includes two sets of arc-extinguishing plates (41). Both ends of the grid body (51) are provided with plug-in blocks (52), and the arc-extinguishing plates (41) are provided with corresponding plug-in holes.

6. The arc-extinguishing structure of a circuit breaker according to claim 5, characterized in that: The lower end of the arc-extinguishing plate (41) is arranged in an L-shape.

7. The arc-extinguishing structure of a circuit breaker according to claim 5, characterized in that: The thickness of the grid body (51) of the first grid group (5) is greater than the thickness of the grid body (51) of the second grid group (6).

8. The arc-extinguishing structure of a circuit breaker according to claim 3, characterized in that: The mounting block (72) is provided in multiple sets, and each mounting block (72) is provided with a limiting groove (74) through which the limiting plate (73) is inserted.

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