CN100490041C - Isolated switch main contact for circuit breaker combined electric appliance - Google Patents

Abstract

The invention relates to a main contact piece of a disconnecting switch of a circuit breaker combined electrical appliance, which comprises a moving contact assembly (2) and a static contact piece (3). The assembly (2) includes a support (21), a plurality of movable contacts (23) that are evenly distributed around the support (21) and connected to the conductive cover (242) of the outer cover (20); A leaf spring (22) is arranged between (23) and the inner wall of the cylinder of the outer cover (20); inside the hole. The main contacts of the isolating switch of the circuit breaker combined electrical appliance of the present invention are suitable for long-term outdoor use and the operating force is relatively small.

Description

The main contact of the isolating switch of the circuit breaker combination

technical field

The invention relates to a component of a high-voltage electrical appliance, in particular to a main contact piece of an isolating switch of a circuit breaker combined electrical appliance.

Background technique

The circuit breaker combination for outdoor use is composed of a circuit breaker and an isolating switch. The main contact of the isolating switch usually adopts a point contact with a leaf spring on both sides, or a surface contact with a spring on one side. These two structures are all exposed, and the moving parts are exposed to sunlight and rain, and are susceptible to mildew, electrical and chemical corrosion, which is not conducive to long-term safe operation. Practice has proved that after a few months of operation, the surface of the contact will be oxidized and moldy, resulting in an increase in contact resistance. At the same time, it will bring unfavorable factors such as grease solidification, sticking dust, etc. Inconvenient, thus affecting the normal operation of the power line, greatly increasing the maintenance workload.

Contents of the invention

The purpose of the present invention is to provide a disconnector switch main contact piece which is suitable for long-term outdoor use and has a small operating force when used.

In order to achieve the above object, the main contacts of the isolating switch of the circuit breaker combined electrical appliance of the present invention include a moving contact assembly and a static contact, and an outer cover is provided on the outside of the above moving contact assembly; And connected to a plurality of movable contacts on the conductive cover of the outer cover; a leaf spring is provided between each movable conductive contact finger and the inner wall of the outer cover cylinder; the static contact finger core of the static contact is inserted by the movable conductive contacts Refers to the composition of the vias.

In the above technical solution, side grooves for arranging movable fingers are evenly provided around the bracket.

In the above technical solution, the lower part of the conductive cover of the outer cover is an I-shaped hanging platform, and each movable contact finger of the conductive block is hung on the I-shaped hanging platform through the inner boss of the upper end, and the outer cover is provided with a conductive piece .

In the above technical solution, a boss is provided on the outside of the upper end of the movable contact finger, so that the upper end forms a T-shaped head, and a boss is provided on the outer side of the lower end of the movable contact finger, and the leaf spring is arranged on the outer side of the upper and lower ends of the movable contact finger. between bosses.

In the above technical solution, the end of the movable contact finger has a circular arc transition surface; the top surface of the static contact finger core is a hemispherical surface.

In the above technical solution, a central hole that can cooperate with the hemispherical surface is provided in the center of the bracket.

Compared with the prior art, the present invention has the following positive effects: (1) in the present invention, the moving contact assembly and the static contact finger core of the main contact of the isolating switch are arranged in the outer cover, which effectively slows down mildew and electrical and chemical damage. Corrosion occurs; at the same time, multiple pairs of movable contacts and leaf springs in the moving contact assembly are evenly arranged along the periphery of the bracket. Under the action of current, each movable contact points to the center. Contact with the static contact core; on the other hand, it can also reduce the pressure requirement of the leaf spring, thereby reducing the friction force when the movable contact finger and the static contact core slide relative to each other, that is, reducing the operating force. (2) In the present invention, the end of the movable contact finger is an arc surface, and the top surface of the static contact finger core is a hemispherical surface, which is suitable for further reducing the friction force between the movable contact finger and the static contact finger core when sliding relative to each other, and can prevent two Misalignment occurs between them.

Description of drawings

In order to make the content of the present invention more easily understood, the present invention will be described in further detail below in conjunction with the specific embodiments according to the accompanying drawings, wherein

Fig. 1 is a structural schematic diagram of a circuit breaker combined electrical appliance;

Fig. 2 is a schematic diagram of the enlarged structure of the circuit breaker combination of the circuit breaker combination in Fig. 1, that is, part A;

Fig. 3 is a structural schematic diagram of the disconnector main contact of the circuit breaker combined electrical appliance of the present invention;

Fig. 4 is a schematic exploded view of the structure of the housing and the moving contact assembly of the present invention;

5 is a schematic structural view of the conductive block of the moving contact assembly of the present invention;

Fig. 6 is an exploded schematic diagram of the structure of the movable contact finger and the leaf spring of the present invention.

Detailed ways

Example 1:

The main contact of the isolating switch of the circuit breaker combined electrical appliance in this embodiment includes a moving contact assembly 2 and a static contact 3 .

An outer cover 20 is provided on the outside of the moving contact assembly 2; the moving contact assembly 2 includes a bracket 21 and 6 (in other embodiments, it may be 4 or 5) movable contact fingers 23 .

The lower part of the conductive cover 242 of the outer cover 20 is an I-shaped hanging platform 241 , and the conductive member 24 is arranged on the outer cover cover 242 .

Side grooves 211 are uniformly arranged around the bracket 21 for accommodating movable fingers 23 .

Each movable contact finger 23 is hung on the said I-shaped hanging platform 241 through the boss 230 inside the upper end.

A leaf spring 22 is provided between each movable conductive contact finger 23 and the cylinder inner wall of the housing 20 ;

The outer side of the upper end of the movable contact finger 23 is provided with a boss, so that the upper end forms a T-shaped head. Between 231.

The end of the movable contact finger 23 has a circular arc transition surface 232; the top surface of the static contact finger core 301 is a hemispherical surface.

A central hole 212 is provided in the center of the bracket 21 to match the hemispherical surface.

Apparently, the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, rather than limiting the implementation of the present invention. For those of ordinary skill in the art, other changes or changes in different forms can be made on the basis of the above description. It is not necessary and impossible to exhaustively list all the implementation manners here. And these obvious changes or modifications derived from the spirit of the present invention are still within the protection scope of the present invention.

Claims (5)

1, a kind of isolated switch main contact spare of circuit breaker combined electrical apparatus comprises movable contact assembly (2) and stationary contact spare (3), and it is characterized in that: the outside of above-mentioned movable contact assembly (2) is provided with outer cover (20); Movable contact assembly (2) comprises support (21), is evenly distributed all around and is connected a plurality of movable conduction fingertips (23) on the conduction cover cap (242) of outer cover (20) along support (21); Between every movable conduction fingertip (23) and outer cover (20) inboard wall of cylinder, be provided with sheet spring (22); The static contact finger core (301) of stationary contact spare (3) inserts in the through hole of being made up of described each movable conduction fingertip (23); Evenly be provided with the limit groove (211) that is used for arrangement activity conduction fingertip (23) around the described support (21).

2, the isolated switch main contact spare of circuit breaker combined electrical apparatus according to claim 1, it is characterized in that: the bottom of above-mentioned conduction cover cap (242) is worker's shape hanging platform (241), each movable conduction fingertip (23) of conducting block is hung on described worker's shape hanging platform (241) by its inboard boss in upper end (230), and described conduction cover cap (242) is provided with electric-conductor (24).

3, the isolated switch main contact spare of circuit breaker combined electrical apparatus according to claim 2, it is characterized in that: the outside, upper end of described movable conduction fingertip (23) is provided with boss, make its upper end form T shape head, the outside, lower end of movable conduction fingertip (23) is provided with boss, and above-mentioned spring (22) is arranged between the outside boss (231) of movable conduction fingertip (23) upper and lower end.

4, according to the isolated switch main contact spare of the described circuit breaker combined electrical apparatus of one of claim 1-3, it is characterized in that: the end of above-mentioned movable conduction fingertip (23) has arc transition face (232); The top end face of static contact finger core (301) is a hemisphere face.

5, the isolated switch main contact spare of circuit breaker combined electrical apparatus according to claim 4 is characterized in that: support (21) central authorities are provided with the medium pore (212) that can match with described hemisphere face.

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