CN220189535U - Small-sized circuit breaker - Google Patents

Abstract

The utility model provides a miniature circuit breaker, which comprises a shell and a contact support movably arranged in the shell, wherein the contact support comprises a contact support body and an indicating part which is arranged on the contact support body and used for indicating a switching-off or switching-on state, and the indicating part and the contact support body are of a double-color one-time injection molding structure. When the contact support breaks away from in the mould, contact support body and indicator have been integrated into one piece, compare with the mode that the printing ink silk screen printing needed to process the different indicator face of colour on the contact support in the prior art, production process is simple like this, has improved production efficiency greatly, and is more environmental protection like this.

Description

Small-sized circuit breaker

Technical Field

The utility model relates to the technical field of piezoelectric devices, in particular to a miniature circuit breaker.

Background

Miniature circuit breakers refer to protective appliances mounted on terminal distribution lines, which are used primarily for overload and short-circuit protection of lines and electrical equipment.

The miniature circuit breaker comprises a shell, a contact support and a moving contact, wherein the moving contact is fixed on the contact support, and when the contact support rotates, the moving contact can be driven to be in contact with the fixed contact for connection or disconnection. In order to facilitate a user to observe the opening and closing state of the circuit breaker, an indication window is arranged on the shell, and a switching-off indication surface and a switching-on indication surface with different colors are arranged on the contact support, wherein the switching-off indication surface of the contact support is correspondingly arranged with the indication window in the switching-off state; when in a closing state, a closing indication surface of the contact support is arranged corresponding to the indication window. After injection molding, the existing contact support is processed into a brake opening indication surface and a brake closing indication surface through printing ink silk screen printing, so that the production process is complex, and the production cost is increased; in addition, when the ink is silk-screened, a certain solvent volatilizes or is discharged into the air to pollute the environment, and the human body is seriously damaged.

Disclosure of Invention

Therefore, the technical problem to be solved by the utility model is to overcome the defects of complex production procedures and environmental protection in the contact bracket in the prior art, thereby providing the miniature circuit breaker with simple production procedures and environmental protection.

The utility model provides a miniature circuit breaker which comprises a shell and a contact support movably mounted in the shell, wherein the contact support comprises a contact support body and an indicating part which is arranged on the contact support body and used for indicating a switching-off or switching-on state, and the indicating part and the contact support body are of a two-color one-time injection molding structure.

The top of casing is equipped with the instruction window, the instruction portion with the instruction window corresponds the setting.

And the shell is internally provided with a moving contact, a flexible connection and a bimetallic strip which are connected in sequence, and the moving contact is fixed in an installation groove of the contact support.

The flexible connection comprises a main body section, a first connection section and a second connection section, wherein the first connection section and the second connection section are respectively arranged at two ends of the main body section, the first connection section is embedded in the moving contact, and the second connection section is fixed with the bimetallic strip through welding.

The movable contact is formed into a plate shape by conductive powder through die casting, and the conductive powder is die-cast on the first connecting section.

The soft connection is a copper braid or a copper soft stranded wire.

The technical scheme of the utility model has the following advantages:

1. according to the miniature circuit breaker provided by the utility model, the indication part and the contact support body are of a double-color one-time injection molding structure, the colors of the indication part and the contact support body are different, during injection molding, the contact support body is injected in a pair of dies, after the injection molding of the contact support body is completed, the indication part is continuously injected, and when the contact support is separated from the dies, the contact support body and the indication part are of an integral structure.

2. Compared with the welding mode of the flexible connection and the moving contact in the prior art, the small circuit breaker provided by the utility model has the advantages that the defects of cold joint, temperature rise and the like caused by welding are avoided, the reliability is higher, and the service life is prolonged.

3. The small-sized circuit breaker provided by the utility model has the advantages that the movable contact is formed into the shape of a plate by die casting conductive powder, the conductive powder is die-cast on the connecting section, in the prior art, the movable contact is required to be punched on the existing copper plate, and then the movable contact and the soft connection are welded.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural view of a miniature circuit breaker of the present utility model;

fig. 2 is a perspective view of a contact holder;

FIG. 3 is an assembled perspective view of the flexible connection and the movable contact;

fig. 4 is an assembly schematic diagram of the flexible connection and the movable contact.

Reference numerals illustrate: 1. a housing; 2. a contact holder; 3. a contact holder body; 4. an instruction unit; 5. an indication window; 6. a moving contact; 7. soft connection; 8. bimetallic strips; 9. a main body section; 11. a first connection section; 12. and a second connection section.

Detailed Description

The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In addition, the technical features of the different embodiments of the present utility model described below may be combined with each other as long as they do not collide with each other.

Examples

The present embodiment provides a miniature circuit breaker, as shown in fig. 1 and 3, comprising a housing 1, a contact holder 2, a moving contact 6, a flexible connection 7 and a bimetal 8.

The top of the shell 1 is provided with an indication window 5.

The contact support 2 is rotatably installed on the shell 1, as shown in fig. 1 and 2, and comprises a contact support body 3 and an indicating part 4 which is arranged at the top of the contact support body 3 and used for indicating the opening or closing state, wherein the indicating part 4 and the contact support body 3 are of a two-color one-time injection molding structure, and the indicating part 4 and the indicating window 5 are correspondingly arranged. When the contact support 2 breaks away from the mould, the contact support body 3 and the indication part 4 are of an integral structure, and compared with the prior art, which needs to process indication surfaces with different colors on the contact support through printing ink silk screen printing, the contact support is produced in a pair of moulds, the processing procedure is simple, the production efficiency is greatly improved, and the contact support is more environment-friendly. Note that, the colors of the contact support body 3 and the indication portion 4 are different, for example, the indication portion 4 is used as a switch-off indication surface, and a surface of the top of the contact support body 3, which is disposed adjacent to the indication portion 4, may be used as a switch-on indication surface.

As shown in fig. 3 and 4, the moving contact 6, the flexible connection 7 and the bimetallic strip 8 are connected in sequence, and the moving contact 6 is fixed in the mounting groove of the contact support 2. The flexible connection 7 comprises a main body section 9, and a first connection section 11 and a second connection section 12 which are respectively arranged at two ends of the main body section 9, wherein the first connection section 11 is embedded in the moving contact 6, and the second connection section 12 is fixed with the bimetallic strip 8 through welding. The movable contact 6 is formed into a plate shape by die casting conductive powder, and the conductive powder is die-cast on the first connection section 11. In this embodiment, the conductive powder is graphite or a graphite/copper matrix composite, and the flexible connection 7 is a copper braid or a copper flexible stranded wire.

It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the utility model.

Claims (6)

1. The utility model provides a miniature circuit breaker, includes casing (1), and movable mounting in contact support (2) in casing (1), its characterized in that, contact support (2) include contact support body (3), and locate on contact support body (3), be used for instructing the instruction portion (4) of separating brake or combined floodgate state, instruction portion (4) with contact support body (3) are two-shot injection moulding structure.

2. The miniature circuit breaker according to claim 1, characterized in that the top of the housing (1) is provided with an indication window (5), the indication portion (4) being arranged in correspondence with the indication window (5).

3. Miniature circuit breaker according to claim 1 or 2, characterized in that the housing (1) is further internally provided with a moving contact (6), a flexible connection (7) and a bimetallic strip (8) which are connected in sequence, and the moving contact (6) is fixed in the mounting groove of the contact support (2).

4. A miniature circuit breaker according to claim 3, characterized in that the flexible connection (7) comprises a main body section (9), and a first connection section (11) and a second connection section (12) which are arranged at two ends of the main body section (9), wherein the first connection section (11) is embedded in the moving contact (6), and the second connection section (12) is fixed with the bimetallic strip (8) by welding.

5. Miniature circuit breaker according to claim 4, characterized in that the moving contact (6) is die-cast from an electrically conductive powder into a plate shape and the electrically conductive powder is die-cast onto the first connection section (11).

6. A miniature circuit breaker according to claim 3, characterized in that the flexible connection (7) is a copper braid or a copper flexible strand.