Miniature circuit breaker arc extinguishing chamber

Abstract

The utility model discloses a miniature circuit breaker arc extinguishing chamber comprising two side plates and a plurality of main arc extinguishing grid sheets, the plurality of main arc extinguishing grid sheets are arranged between the two side plates at equal intervals, a plurality of auxiliary arc extinguishing grid sheets are arranged between the two side plates, the plurality of auxiliary arc extinguishing grid sheets and the plurality of main arc extinguishing grid sheets are arranged in a staggered manner along the vertical direction, and the plurality of auxiliary arc extinguishing grid sheets are arranged in a staggered manner along the vertical direction. One side of the two side plates, which is adjacent to each other, is provided with a support block for limiting the main arc extinguishing grid sheet, the support block is provided with a through groove in a penetrating manner, one side of each side plate, which is far away from the support block, is provided with a heat dissipation groove, and the heat dissipation groove is communicated with the through groove. And the heat dissipation grooves and the through grooves are arranged, so that the main arc-extinguishing grid sheets can dissipate heat through the side plates, the heat dissipation area of the main arc-extinguishing grid sheets is increased, the heat dissipation capability of the main arc-extinguishing grid sheets is improved, and the accumulation of heat on the main arc-extinguishing grid sheets is reduced, thereby facilitating the rapid extinguishing of electric arcs and further improving the arc-extinguishing effect of the arc-extinguishing grid sheets.

Description

Technical Field

[0001] The utility model relates to the technical field of arc extinguishing covers, in particular to an arc extinguishing cover for a miniature circuit breaker. Background Art

[0002] During the closing and opening processes of a circuit breaker, an electric arc will be generated. Therefore, an arc extinguishing cover is installed to quickly extinguish the electric arc. The arc extinguishing principle is that when the electric arc enters the arc extinguishing cover, the arc extinguishing grid plates in the arc extinguishing cover will absorb the heat of the electric arc, causing the temperature of the electric arc to drop rapidly. The reduction of the electric arc temperature will reduce its energy, making it difficult to maintain the combustion state, thereby accelerating the extinguishing of the electric arc. Moreover, the arc extinguishing grid plates in the arc extinguishing cover will also divide the electric arc into multiple small segments. Each small segment of the electric arc has relatively low energy and maintaining voltage, so it is easier to extinguish, and thus the extinguishing speed of the entire electric arc is also increased.

[0003] Due to the limitation of the internal space of the existing arc extinguishing cover in a miniature circuit breaker, the volume of the arc extinguishing cover is small, resulting in a poor arc extinguishing effect. When the voltage is large or the circuit is short-circuited, a large amount of electric arcs are easily generated. The arc extinguishing cover is difficult to meet the arc extinguishing requirements, and the electric arcs are difficult to extinguish quickly, leading to the burning of the contact or other parts of the circuit breaker. Summary of the Utility Model

[0004] The purpose of the utility model is to provide an arc extinguishing cover for a miniature circuit breaker to solve the problems raised in the above background art.

[0005] To achieve the above purpose, the utility model provides the following technical solution: an arc extinguishing cover for a miniature circuit breaker, including two side plates and a plurality of main arc extinguishing grid plates. The plurality of main arc extinguishing grid plates are equidistantly arranged between the two side plates. A plurality of auxiliary arc extinguishing grid plates are arranged between the two side plates. The plurality of auxiliary arc extinguishing grid plates and the plurality of main arc extinguishing grid plates are arranged alternately in the vertical direction. A support block for limiting the main arc extinguishing grid plates is arranged on one side where the two side plates are adjacent. A through groove is penetrated through the support block. A heat dissipation groove is arranged on the side of the side plate away from the support block, and the heat dissipation groove is communicated with the through groove.

[0006] As a preferred scheme of the utility model, two arc blocking plates are installed between the two side plates, and the two arc blocking plates are respectively installed at the top and bottom of the arc blocking plate.

[0007] As a preferred scheme of the utility model, a convex block is integrally formed on one side of the side plate.

[0008] As a preferred scheme of the utility model, second clamping blocks are arranged on both sides of the main arc extinguishing grid plate. Second clamping grooves are formed on the side plate and are matched with the second clamping blocks, and the second clamping grooves are communicated with the adjacent through grooves.

[0009] As a preferred embodiment of the present utility model, third clamping blocks are provided on both sides of the auxiliary arc extinguishing grid plate, third clamping grooves matching with the third clamping blocks are provided on the side plates, first clamping blocks are provided on both sides of the arc blocking plate, and first clamping grooves matching with the first clamping blocks are provided on the side plates.

[0010] As a preferred embodiment of the present utility model, an outward expansion part is provided on one side of each of the first clamping groove, the second clamping groove and the third clamping groove.

[0011] Compared with the prior art, the beneficial effects of the present utility model are as follows: the auxiliary arc extinguishing grid plate provided by the present utility model can perform secondary arc extinguishing to improve the arc extinguishing effect, and the main arc extinguishing grid plate can dissipate heat through the side plate by means of the heat dissipation grooves and the through grooves provided, increasing the heat dissipation area of the main arc extinguishing grid plate and improving its heat dissipation capacity, so that the main arc extinguishing grid plate can more effectively dissipate the heat generated by the arc, reducing the accumulation of heat on the main arc extinguishing grid plate, which is beneficial to the rapid extinction of the arc and further improves its arc extinguishing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is a three-dimensional structural schematic diagram of the present utility model;

[0013] Figure 2 is a structural schematic diagram of the main arc extinguishing grid plate and the auxiliary arc extinguishing grid plate of the present utility model;

[0014] Figure 3 is a sectional view of the side plate of the present utility model;

[0015] Figure 4 is a structural schematic diagram of the arc blocking plate of the present utility model.

[0016] In the figure: 1, side plate; 2, main arc extinguishing grid plate; 3, auxiliary arc extinguishing grid plate; 4, support block; 5, arc blocking plate; 6, first clamping groove; 7, first clamping block; 8, second clamping groove; 9, second clamping block; 10, third clamping groove; 11, third clamping block; 12, heat dissipation groove; 13, convex block; 14, through groove; 15, outward expansion part. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0018] Please refer to Figures 1 to 4, the present utility model provides a technical solution: a miniature circuit breaker arc extinguishing cover, which includes two side plates 1 and a plurality of main arc extinguishing grid plates 2. The plurality of main arc extinguishing grid plates 2 are arranged at equal intervals between the two side plates 1. A plurality of auxiliary arc extinguishing grid plates 3 are provided between the two side plates 1. When the arc has not been extinguished after passing through the main arc extinguishing grid plates 2, the arc will enter the auxiliary arc extinguishing grid plates 3. The auxiliary arc extinguishing grid plates 3 re-divide the arc to make it extinguish, thereby realizing the secondary arc extinguishing function, improving the arc extinguishing effect. The plurality of auxiliary arc extinguishing grid plates 3 and the plurality of main arc extinguishing grid plates 2 are arranged staggered in the vertical direction. On one side where the two side plates 1 are adjacent, there is a support block 4 for limiting the main arc extinguishing grid plates 2. The support block 4 is used to support and limit the main arc extinguishing grid plates 2 to ensure the stable installation of the main arc extinguishing grid plates 2. A through groove 14 runs through the support block 4. On the side of the side plate 1 away from the support block 4, there is a heat dissipation groove 12. The heat of the main arc extinguishing grid plates 2 can be dissipated from the heat dissipation groove 12 through the through groove 14, increasing the heat dissipation area of the main arc extinguishing grid plates 2, improving its heat dissipation capacity, enabling the main arc extinguishing grid plates 2 to more effectively dissipate the heat generated by the arc, reducing the accumulation of heat on the main arc extinguishing grid plates 2, thereby facilitating the rapid extinguishing of the arc and improving its arc extinguishing effect. The heat dissipation groove 12 is communicated with the through groove 14.

[0019] Among them, two arc baffle plates 5 are installed between the two side plates 1. The arc baffle plates 5 are used to block the gap between the main arc extinguishing grid plates 2 and the auxiliary arc extinguishing grid plates 3 to prevent the arc from flying out from the gap and damaging other parts inside the circuit breaker. The two arc baffle plates 5 are respectively installed at the top and bottom of the arc baffle plates 5.

[0020] Among them, a convex block 13 is integrally formed on one side of the side plate 1. The convex block 13 is used to limit one side of the main arc extinguishing grid plates 2, further improving the stability of the installation of the main arc extinguishing grid plates 2.

[0021] Among them, second clamping blocks 9 are provided on both sides of the main arc extinguishing grid plates 2, and the number of second clamping blocks 9 on the same side is two. Since the main arc extinguishing grid plates 2 are relatively long, a plurality of second clamping blocks 9 are provided to fix them to ensure firm installation. Second clamping grooves 8 are formed on the side plates 1 and are matched with the second clamping blocks 9. The second clamping blocks 9 and the second clamping grooves 8 cooperate to fix the main arc extinguishing grid plates 2 on the side plates 1, and the second clamping grooves 8 are communicated with the adjacent through grooves 14.

[0022] Among them, third clamping blocks 11 are provided on both sides of the auxiliary arc extinguishing grid plates 3. Third clamping grooves 10 are provided on the side plates 1 and are matched with the third clamping blocks 11. The third clamping blocks 11 and the third clamping grooves 10 cooperate to fix the auxiliary arc extinguishing grid plates 3 on the side plates 1. First clamping blocks 7 are provided on both sides of the arc baffle plates 5. First clamping grooves 6 are provided on the side plates 1 and are matched with the first clamping blocks 7. The first clamping blocks 7 and the first clamping grooves 6 cooperate to fix the arc baffle plates 5 and the side plates 1.

[0023] Among them, an outward expansion part 15 is provided on one side of the first card slot 6, the second card slot 8 and the third card slot 10. The outward expansion part 15 is used to play a guiding role, making it easier for the first card block 7, the second card block 9 and the third card block 11 to be inserted.

[0024] Specifically, during arc extinguishing, the arc will first enter between the main arc extinguishing grid sheets 2. The main arc extinguishing grid sheets 2 will divide the arc into many short arcs, thereby accelerating the cooling and extinguishing of the arc. If there is still part of the arc not extinguished, it will enter between the auxiliary arc extinguishing grid sheets 3. Since the auxiliary arc extinguishing grid sheets 3 and the main arc extinguishing grid sheets 2 are arranged in a staggered manner, the arc will be cut again. The auxiliary arc extinguishing grid sheets 3 perform secondary arc extinguishing on the arc, making the arc completely extinguished. During the arc extinguishing process, due to the blocking of the arc blocking plate 5, the arc will not fly out from the gap between the main arc extinguishing grid sheets 2 and the auxiliary arc extinguishing grid sheets 3, improving its safety.

[0025] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "coaxial", "bottom", "one end", "top", "middle part", "the other end", "upper", "one side", "top", "inner", "front part", "center", "both ends", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation to the present invention.

[0026] In addition, the terms "first", "second", "third", "fourth" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second", "third", "fourth" may explicitly or implicitly include at least one of such features.

[0027] In the present invention, unless otherwise clearly defined and limited, the terms "installation", "setting", "connection", "fixation", "swivel connection", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. It can be the communication inside two elements or the interaction relationship between two elements. Unless otherwise clearly defined, for those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0028] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A miniature circuit breaker arc extinguishing cover, comprising two side plates (1) and a plurality of main arc extinguishing grid plates (2). The plurality of main arc extinguishing grid plates (2) are arranged at equal intervals between the two side plates (1), and it is characterized in that: A plurality of auxiliary arc extinguishing grid plates (3) are provided between the two side plates (1). The plurality of auxiliary arc extinguishing grid plates (3) and the plurality of main arc extinguishing grid plates (2) are arranged staggered in the vertical direction. A support block (4) for limiting the main arc extinguishing grid plate (2) is provided on one adjacent side of the two side plates (1). A through groove (14) is provided through the support block (4). A heat dissipation groove (12) is provided on the side of the side plate (1) away from the support block (4). The heat dissipation groove (12) is communicated with the through groove (14).

2. The arc extinguishing cover of a miniature circuit breaker according to claim 1, characterized in that: Two arc baffle plates (5) are installed between the two side plates (1). The two arc baffle plates (5) are respectively installed at the top and the bottom of the arc baffle plate (5).

3. The arc extinguishing cover of a miniature circuit breaker according to claim 1, characterized in that: A convex block (13) is integrally formed on one side of the side plate (1).

4. The arc extinguishing cover of a miniature circuit breaker according to claim 2, wherein: Second clamping blocks (9) are provided on both sides of the main arc extinguishing grid plate (2). Second clamping grooves (8) matching with the second clamping blocks (9) are formed on the side plate (1), and the second clamping grooves (8) are communicated with the adjacent through groove (14).

5. A mini circuit breaker arc extinguishing cover according to claim 4, characterized in that: Third clamping blocks (11) are provided on both sides of the auxiliary arc extinguishing grid plate (3). Third clamping grooves (10) matching with the third clamping blocks (11) are provided on the side plate (1). First clamping blocks (7) are provided on both sides of the arc baffle plate (5). First clamping grooves (6) matching with the first clamping blocks (7) are provided on the side plate (1).

6. The arc extinguishing cover of a miniature circuit breaker according to claim 5, characterized in that: An outward expansion part (15) is provided on one side of each of the first clamping groove (6), the second clamping groove (8) and the third clamping groove (10).

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