CN219626575U - Small-sized circuit breaker - Google Patents

Abstract

The utility model provides a miniature circuit breaker, which comprises a moving contact, a flexible connection and a bimetallic strip which are sequentially connected, wherein the flexible connection comprises a main body section and a connecting section which is positioned at the end part of the main body section and embedded in the moving contact; the movable contact is formed into a plate shape 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 a copper plate, and then the movable contact and the soft connection are welded.

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 overload protection mechanism of the existing miniature circuit breaker comprises a bimetallic strip, a double-gold pull rod and a lock catch, wherein the bottom end of the bimetallic strip is connected with a wiring terminal, the top end of the bimetallic strip is connected with a moving contact through a flexible connection, when the current flowing through the bimetallic strip is overlarge, the bimetallic strip can bend and deform, and the lock catch is driven to move towards the opening direction through the double-gold pull rod, so that the circuit breaker is opened. The flexible connection is generally a copper braid or copper flexible stranded wire, and is fixed with the movable contact through welding, but the welding has the defect of cold joint and temperature rise at the welding point.

Disclosure of Invention

Therefore, the technical problem to be solved by the utility model is to overcome the defects of the prior art that the soft connection, the over-welding and the moving contact are fixed, and the temperature at the position of the virtual welding point and the welding point is increased, so that the small-sized circuit breaker with high reliability is provided.

The utility model provides a miniature circuit breaker which comprises a moving contact, a flexible connection and a bimetallic strip which are sequentially connected, wherein the flexible connection comprises a main body section and a connecting section which is positioned at the end part of the main body section and embedded in the moving contact.

The movable contact is formed into a plate shape by conducting powder in a die-casting mode, and the conducting powder is die-cast on the connecting section.

The movable contact comprises a movable contact plate and a movable contact integrally protruding on the movable contact plate.

The movable contact plate and the movable contact are integrally formed by die casting conductive powder.

The movable contact is characterized by further comprising a fixed contact which is arranged opposite to the movable contact, wherein the fixed contact comprises a fixed contact plate and a fixed contact integrally protruding on the fixed contact plate.

The fixed contact plate and the fixed contact are integrally formed by die casting conductive powder.

The conductive powder is graphite or a graphite/copper matrix composite.

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. 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.

2. 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.

The small-sized circuit breaker provided by the utility model has the advantages that the movable contact comprises the movable contact plate and the movable contact integrally protruding on the movable contact plate, the fixed contact comprises the fixed contact plate and the fixed contact integrally protruding on the fixed contact plate, and the contact plate and the contact are integrally die-cast by conductive powder.

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 rear view of a miniature circuit breaker of the present utility model;

fig. 2 is a front view of the miniature circuit breaker with the soft connection omitted;

FIG. 3 is a perspective view of the connection of the flexible connection to the movable contact;

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

Reference numerals illustrate: 1. a moving contact; 2. soft connection; 3. bimetallic strips; 4. a main body section; 5. a connection section; 6. a moving contact plate; 7. a movable contact; 8. a stationary contact; 9. a stationary contact plate; 10. and a stationary contact.

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 embodiment provides a miniature circuit breaker, which comprises a moving contact 1, a flexible connection 2, a bimetallic strip 3 and a fixed contact 8 as shown in fig. 1.

The flexible connection 2, as shown in fig. 3 and 4, comprises a main body section 4, and a connecting section 5 which is positioned at one end of the main body section 4 and embedded in the moving contact 1, wherein the other end of the main body section 4 is connected with the bimetallic strip 3. In this embodiment, the flexible connection 2 is a copper braid or a copper flexible twisted wire.

The movable contact 1 is formed into a plate shape by die casting conductive powder, and the conductive powder is die-cast on the connecting section 5. As shown in fig. 1 and 2, the movable contact 1 includes a movable contact plate 6, and a movable contact 7 integrally protruding on the movable contact plate 6. In this embodiment, the movable contact plate 6 and the movable contact 7 are integrally die-cast from conductive powder, and in this embodiment, the conductive powder may be graphite or a graphite/copper matrix composite.

The fixed contact 8 is arranged opposite to the movable contact 1, and as shown in fig. 1 and 2, the fixed contact 8 comprises a fixed contact plate 9 and a fixed contact 10 integrally protruding on the fixed contact plate 9. The fixed contact plate 9 and the fixed contact 10 are integrally die-cast and formed by conductive powder.

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.

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 (8)

1. The utility model provides a miniature circuit breaker, includes moving contact (1), flexible coupling (2) and bimetallic strip (3) that connect gradually, its characterized in that, flexible coupling (2) include main part section (4), and are located the tip of main part section (4), inlay locate connecting section (5) in moving contact (1).

2. Miniature circuit breaker according to claim 1, characterized in that the moving contact (1) is die-cast from conductive powder into a plate shape and the conductive powder is die-cast onto the connection section (5).

3. Miniature circuit breaker according to claim 1 or 2, characterized in that the moving contact (1) comprises a moving contact plate (6) and a moving contact (7) integrally protruding on the moving contact plate (6).

4. A miniature circuit breaker according to claim 3, characterized in that the moving contact plate (6) and the moving contact (7) are integrally die-cast from conductive powder.

5. The miniature circuit breaker according to claim 1, characterized in that it further comprises a stationary contact (8) arranged opposite to said moving contact (1), said stationary contact (8) comprising a stationary contact plate (9), and a stationary contact (10) integrally protruding on said stationary contact plate (9).

6. Miniature circuit breaker according to claim 5, characterized in that the stationary contact plate (9) and the stationary contact (10) are integrally die-cast from an electrically conductive powder.

7. The miniature circuit breaker of any of claims 2,4,6, wherein the conductive powder is graphite.

8. Miniature circuit breaker according to claim 1, characterized in that the flexible connection (2) is a copper braid or a copper flexible strand.