Shell structure of molded case circuit breaker

Abstract

The utility model relates to the technical field of low-voltage electric appliance manufacturing, in particular to a molded case circuit breaker shell structure which comprises a circuit breaker body, a middle cover connected with the circuit breaker body is arranged in the circuit breaker body, an accessory cavity extending towards the interior of the circuit breaker body is arranged in the middle cover, a small cover capable of sealing the accessory cavity is arranged in the middle cover, and the small cover is connected with the circuit breaker body. The middle cover is provided with an upper cover connected with the circuit breaker body, the middle cover is fastened on the circuit breaker body through a screw, the upper cover is fastened on one side of the middle cover through a long screw, the accessory cavity is located on the other side of the middle cover, and the small cover is fastened on the middle cover through a short screw. Compared with the prior art, the molded case circuit breaker shell structure is provided with the small cover, so that the size of the upper cover is reduced, the molded case circuit breaker shell structure is universal with an upper cover of a three-pole circuit breaker, and the strength of the shell is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of low-voltage electrical appliance manufacturing, in particular to a housing structure of a molded case circuit breaker. Background Art

[0002] A circuit breaker is an electrical product that can automatically cut off the power supply to protect under the conditions of undervoltage, overload and short circuit. A molded case circuit breaker is a circuit breaker in which all components are assembled into an integral body with a housing made of molded insulating material.

[0003] In a general power distribution network, the harm of the N-line break fault is relatively large. Therefore, a three-pole molded case circuit breaker is generally selected, and a four-pole one is only selected in special occasions such as when isolation is required. Since the four-pole circuit breaker is wider than the three-pole circuit breaker, the housing of the four-pole circuit breaker cannot be universal with that of the three-pole one and needs to be re-molded. The upper cover of the four-pole circuit breaker is flat and wide, so it deforms greatly, and the reliability of installing accessories is poor. When the circuit breaker trips due to short circuit, the generated air pressure can easily break through the cover. Summary of the Utility Model

[0004] (1) Technical Problems to be Solved

[0005] In view of the deficiencies of the prior art, the utility model provides a housing structure of a molded case circuit breaker, which has the characteristics of simple structure, reliable installation of accessories, high strength and good part universality.

[0006] (2) Technical Solutions

[0007] To achieve the above purposes, the utility model is realized through the following technical solutions: A housing structure of a molded case circuit breaker includes a circuit breaker body. A middle cover connected to the circuit breaker body is provided in the circuit breaker body. An accessory cavity extending into the circuit breaker body is provided in the middle cover. A small cover capable of sealing the accessory cavity is provided in the middle cover. An upper cover connected to the circuit breaker body is provided on the middle cover.

[0008] Further, the middle cover is fastened to the circuit breaker body by screws. The upper cover is fastened to a side position of the middle cover by long screws. The accessory cavity is located at the other side position of the middle cover. The small cover is fastened to the middle cover by short screws.

[0009] Further, the width of the upper cover is smaller than that of the middle cover. The accessory cavity is located outside the upper cover. The small cover is close to the upper cover.

[0010] Further, a square hole is sequentially provided in the accessory cavity. A rotating shaft capable of performing opening and closing rotation is provided in the circuit breaker body. A boss corresponding to the square hole one by one is sequentially provided on the rotating shaft.

[0011] Further, two square holes are provided in the accessory cavity. Two bosses are provided on the rotating shaft.

[0012] Further, a hole to be knocked is provided on the outer side of the accessory cavity, and a concave surface connected to the accessory cavity is provided on the surface of the middle cover, and the concave surface is adapted to the small cover.

[0013] Further, the shape of the hole to be knocked is a dovetail shape, and the shape of the small cover is a flat plate shape.

[0014] Compared with the prior art, in this plastic case circuit breaker housing structure, by providing a small cover, the volume of the upper cover is reduced, making it universal with the upper cover of a three-pole circuit breaker, and the strength of the housing is improved. Description of the Drawings

[0015] Figure 1 is a three-dimensional structural schematic diagram of the present utility model;

[0016] Figure 2 is an exploded schematic diagram of the present utility model;

[0017] Figure 3 is a schematic diagram of the circuit breaker body of the present utility model;

[0018] Figure 4 is a schematic diagram of the middle cover of the present utility model.

[0019] In the figure: 1, circuit breaker body; 2, middle cover; 3, upper cover; 4, small cover; 6, hole to be knocked; 7, accessory cavity; 8, concave surface; 9, square hole; 10, rotating shaft; 11, convex platform. Detailed Embodiments

[0020] 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 of the embodiments.

[0021] Please refer to Figures 1 to 4, the present utility model provides a technical solution: a housing structure of a molded case circuit breaker, including a circuit breaker body 1, a middle cover 2 connected to the circuit breaker body 1 is provided in the circuit breaker body 1, an accessory cavity 7 extending into the circuit breaker body 1 is provided in the middle cover 2, a small cover 4 capable of sealing the accessory cavity 7 is provided in the middle cover 2, an upper cover 3 connected to the circuit breaker body 1 is provided on the middle cover 2, the middle cover 2 is fastened to the circuit breaker body 1 by screws, the upper cover 3 is fastened to a side position of the middle cover 2 by long screws, the accessory cavity 7 is located at the other side position of the middle cover 2, the small cover 4 is fastened to the middle cover 2 by short screws, the width of the upper cover 3 is smaller than the width of the middle cover 2, the accessory cavity 7 is located outside the upper cover 3, the small cover 4 is close to the upper cover 3, a square hole 9 is sequentially provided in the accessory cavity 7, a rotating shaft 10 capable of performing opening and closing rotation is provided in the circuit breaker body 1, bosses 11 corresponding to the square hole 9 one by one are sequentially provided on the rotating shaft 10, two square holes 9 are provided in the accessory cavity 7, two bosses 11 are provided on the rotating shaft 10, a hole to be knocked 6 is provided outside the accessory cavity 7, a concave surface 8 connected to the accessory cavity 7 is provided on the surface of the middle cover 2 and the concave surface 8 is adapted to the small cover 4, the shape of the hole to be knocked 6 is dovetail-shaped, and the shape of the small cover 4 is flat.

[0022] In the description of this specification, terms such as "connection", "installation", "fixation", "setting", etc. are all understood in a broad sense. For example, "connection" can be a fixed connection or indirectly through an intermediate component without affecting the relationship between components and technical effects, or it can be an integral connection or a partial connection. In the case of this example, for those of ordinary skill in the art, the specific meanings of the above terms in the present utility model or the utility model can be understood according to specific circumstances.

[0023] The above is only the preferred specific embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution and the inventive concept of the present utility model, makes equivalent substitutions or changes, and all should be covered within the protection scope of the present utility model.

Claims

1. A plastic case circuit breaker housing structure, comprising a circuit breaker body (1), characterized in that: The circuit breaker body (1) is provided with a middle cover (2) connected to the circuit breaker body (1). An accessory cavity (7) extending into the circuit breaker body (1) is provided in the middle cover (2). A small cover (4) capable of sealing the accessory cavity (7) is provided in the middle cover (2). An upper cover (3) connected to the circuit breaker body (1) is provided on the middle cover (2).

2. The housing structure of a molded case circuit breaker according to claim 1, wherein: The middle cover (2) is fastened to the circuit breaker body (1) by screws. The upper cover (3) is fastened to a position on one side of the middle cover (2) by long screws. The accessory cavity (7) is located at a position on the other side of the middle cover (2). The small cover (4) is fastened to the middle cover (2) by short screws.

3. The housing structure of a molded case circuit breaker according to claim 2, characterized in that: The width of the upper cover (3) is smaller than the width of the middle cover (2). The accessory cavity (7) is located outside the upper cover (3). The small cover (4) is close to the upper cover (3).

4. A housing structure of a molded case circuit breaker according to claim 3, characterized in that: A square hole (9) is successively provided in the accessory cavity (7). A rotating shaft (10) capable of performing opening and closing rotation is provided in the circuit breaker body (1). Protrusions (11) corresponding to the square hole (9) one by one are successively provided on the rotating shaft (10).

5. A housing structure of a molded case circuit breaker according to claim 4, characterized in that: Two square holes (9) are provided in the accessory cavity (7). Two protrusions (11) are provided on the rotating shaft (10).

6. The housing structure of a molded case circuit breaker according to claim 5, characterized in that: A hole to be knocked (6) is provided outside the accessory cavity (7). A concave surface (8) connected to the accessory cavity (7) is provided on the surface of the middle cover (2), and the concave surface (8) is adapted to the small cover (4).

7. The housing structure of a molded case circuit breaker according to claim 6, characterized in that: The shape of the hole to be knocked (6) is dovetail-shaped. The shape of the small cover (4) is flat.

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