Contact structure of circuit breaker

Abstract

Provided is a contact structure of a circuit breaker. The problems that the upper portion of a static contact of an existing circuit breaker is not limited, and the static contact deforms along with prolonging of the service life are mainly solved. The circuit breaker is characterized in that the circuit breaker also comprises a bottom plate (11) which is arranged in the shell, extends along the horizontal direction and is used for placing the static contact piece; and the limiting plate (12) is correspondingly arranged above the bottom plates, and a limiting groove (13) used for installing part of the static contact is formed between the bottom plates. According to the contact structure of the circuit breaker provided by the utility model, the static contact is limited through the limiting plate on the shell, the static contact is prevented from being deformed, and the service life is prolonged.

Description

Circuit breaker contact structure Technical Field

[0001] This utility model relates to the field of circuit breakers, specifically to the contact structure of circuit breakers. Background Technology

[0002] As shown in Chinese Patent Publication No. CN102856136A, conventional circuit breakers do not have a limit switch above the stationary contact. As the service life increases, the stationary contact is prone to deformation, resulting in poor contact between the moving and stationary contacts, thus affecting the service life of the product. Summary of the Invention

[0003] In order to overcome the shortcomings of the prior art, this utility model provides a contact structure for a circuit breaker, which mainly solves the problem that the stationary contact of the current circuit breaker does not have a limit switch above it, and the stationary contact will deform as its service life increases.

[0004] The technical solution of this utility model is as follows:

[0005] The contact structure of a circuit breaker includes a housing, within which a stationary contact piece and a rotatably mounted contact support are provided. A movable contact piece is mounted on the contact support.

[0006] A base plate, disposed within the housing and extending horizontally, is used for placing the stationary contact piece;

[0007] A limiting plate is disposed above the base plate and forms a limiting groove between the base plates for the installation of part of the stationary contact piece.

[0008] The stationary contact piece includes a horizontal section and a bent section, with at least a portion of the horizontal section located within the limiting groove.

[0009] The housing is equipped with a trip unit, which includes a magnetic yoke, and the magnetic yoke is integrally formed with the stationary contact piece.

[0010] The magnetic yoke and the stationary contact piece are connected together by welding.

[0011] The limiting plate has a structure that is narrower at the front and wider at the rear.

[0012] The bent section is provided with a stationary contact, and the contact support is provided with a baffle. When the circuit breaker is in the open state, the baffle is positioned above the stationary contact.

[0013] The baffle is an arc-shaped plate.

[0014] The bent section is an inclined plate-like structure with its upper end facing the baffle.

[0015] The beneficial effects of this utility model are: This utility model provides a contact structure for a circuit breaker, which limits the stationary contact by a limiting plate on the outer shell, preventing the stationary contact from deforming and increasing its service life. Attached Figure Description

[0016] Figure 1 is a structural schematic diagram of an embodiment of the present invention.

[0017] Figure 2 is an enlarged view of point A in Figure 1.

[0018] Figure 3 is a three-dimensional schematic diagram of the magnetic yoke and stationary contact plate according to an embodiment of the present invention.

[0019] Figure 4 is a partial perspective view of an embodiment of the present invention. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings. The contact structure of the circuit breaker includes a housing 1, within which a stationary contact piece 2 and a rotatably mounted contact bracket 3 are provided. A movable contact piece 4 is mounted on the contact bracket. The circuit breaker also includes a base plate 11, located within the housing and extending horizontally for placing the stationary contact piece. A limiting plate 12 is correspondingly positioned above the base plate, forming a limiting groove 13 between the base plates for partially mounting the stationary contact piece. The contact bracket drives the movable contact to move, thereby achieving the breaking or connecting of the circuit breaker. This is existing technology and will not be described in detail. In this application, the stationary contact piece has its bottom placed on the base plate, with the limiting plate above it for limiting, preventing deformation of the stationary contact piece and increasing its service life.

[0021] In this embodiment, as shown in the figure, the stationary contact piece includes a horizontal segment 41 and a bent segment 42, with at least a portion of the horizontal segment disposed within the limiting groove. The horizontal segment is disposed within the limiting groove, and the limiting plate also extends horizontally, correspondingly positioned above the horizontal segment to prevent deformation.

[0022] In this embodiment, as shown in the figure, a trip unit (not shown in the figure, representing prior art) is provided inside the housing. The trip unit includes a magnetic yoke 5, which is integrally formed with the stationary contact piece. For easy installation, the magnetic yoke itself can be limited on both sides by positioning ribs 10, a conventional installation method. If necessary, limiting blocks 101 can be used to limit movement in other directions. The bottom of the magnetic yoke can also be placed on a base plate.

[0023] In this embodiment, as shown in the figure, the magnetic yoke and the stationary contact piece are connected together by welding.

[0024] In this embodiment, as shown in the figure, the limiting plate has a structure that is narrower at the front end and wider at the rear end. This facilitates insertion and provides a larger limiting area once in place.

[0025] In this embodiment, as shown in the figure, a stationary contact 421 is provided on the bent section, and a baffle 31 is provided on the contact support. When the circuit breaker is in the open state, the baffle is positioned above the stationary contact. When the product breaks, high-pressure gas and an electric arc are generated at the stationary contact. The baffle can prevent these gases from rising and direct them downwards into the arc-extinguishing chamber.

[0026] In this embodiment, as shown in the figure, the baffle is an arc-shaped plate.

[0027] In this embodiment, as shown in the figure, the bent section is an inclined plate-like structure with its upper end facing the baffle. This makes it easier for the baffle to block the flow.

[0028] In the description of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0029] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0030] The embodiments described with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention. The embodiments should not be considered as limitations on the present invention, but any improvements made based on the spirit of the present invention should be within the protection scope of the present invention.

Claims

1. A contact structure of a circuit breaker, comprising a housing (1), wherein a stationary contact piece (2) and a rotatably mounted contact bracket (3) are provided inside the housing, and a movable contact piece (4) is provided on the contact bracket, characterized in that: It also includes a base plate (11), which is disposed inside the housing and extends horizontally for placing the stationary contact piece; and a limiting plate (12), which is disposed above the base plate and forms a limiting groove (13) between the base plates for installing part of the stationary contact piece.

2. The contact structure of the circuit breaker according to claim 1, characterized in that: The stationary contact piece includes a horizontal section (41) and a bent section (42), with at least a portion of the horizontal section located within the limiting groove.

3. The contact structure of the circuit breaker according to claim 1, characterized in that: The housing is provided with a trip unit, which includes a magnetic yoke (5), and the magnetic yoke is integrally formed with the stationary contact piece.

4. The contact structure of the circuit breaker according to claim 3, characterized in that: The magnetic yoke and the stationary contact piece are connected together by welding.

5. The contact structure of the circuit breaker according to any one of claims 1-4, characterized in that: The limiting plate has a structure that is narrower at the front and wider at the rear.

6. The contact structure of the circuit breaker according to claim 2, characterized in that: The bent section is provided with a stationary contact (421), and the contact bracket is provided with a baffle (31). When the circuit breaker is in the open state, the baffle is positioned above the stationary contact.

7. The contact structure of the circuit breaker according to claim 6, characterized in that: The baffle is an arc-shaped plate.

8. The contact structure of the circuit breaker according to claim 7, characterized in that: The bent section is an inclined plate-like structure with its upper end facing the baffle.

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