RU2446500C1 - Blade - Google Patents

Abstract

FIELD: electricity.

SUBSTANCE: blade comprises a movable jack-in contact, a fixed contact and a plank, movably fixed to the fixed contact and pressed to it by means of a spring so that it is possible to locate the movable jack-in contact between the fixed contact and the plank. The fixed contact is made from a single electroconductive plate structurally divided into a support part, a contact part and an output. The support and contact parts are arranged perpendicularly to each other, and the output is arranged either in parallel to the support part or in parallel to the contact part.

EFFECT: reduced electric resistance and increased reliability of the blade, due to maximum possible reduction of zones of increased electric resistance, with simultaneous simplification of design.

3 cl, 4 dwg

Description

The invention relates to electrical engineering, namely to contact systems of low-voltage apparatus engineering, and can be used in detachable contacts of switching devices and fuses.

Known cut contact containing a movable knife contact, a fixed contact in the form of jaws made with the possibility of contact with a movable knife contact, an elastic arcuate element designed to press the jaws to a movable knife contact (see copyright certificate SU 1582220, IPC Н01Н 1/42 ) During operation, an electric current passes from the movable knife contact to the stationary through two points of contact.

The disadvantage of this contact is the instability of the magnitude of the compression force of the contacts, caused by the addition of the spring force with the elastic force of the sponges, which changes during operation of the device and, as a result, changes the electrical resistance of the cutting contact.

The closest in technical essence to the claimed device is a lamella contact containing a movable knife contact, a fixed contact with lamellas fixed on it, made with the possibility of engaging a movable knife contact in them, while the lamellas are pressed against each other by means of coil springs (see copyright Certificate SU 1003165, IPC Н01Н 1/06). Unlike cutting contact according to the certificate SU 1582220, the lamella contact is characterized by a stable and easily adjustable contact compression force.

However, during operation, an electric current passes from the movable knife contact to the fixed contact through at least four points of contact between the lamellas and the contacts, that is, it has at least four zones of increased electrical resistance.

The objective of the invention is to increase the stability of the electrical conductivity of the cutting contact due to the maximum possible reduction of zones of high electrical resistance.

The technical result consists in reducing the electrical resistance and improving the reliability of the cutting contact while simplifying the design.

The claimed technical result is achieved in that the cut-in contact containing a movable knife contact and a fixed contact, according to the solution, is equipped with a bar movably attached to the fixed contact and pressed against it by means of a spring with the possibility of placing the movable knife contact between the fixed contact and the bar. The fixed contact is made of a single conductive plate structurally divided into a support part, a contact part and a terminal. The support and contact parts are perpendicular to each other, and the output is either parallel to the support part or parallel to the contact part.

The invention is illustrated by drawings, where Fig. 1 is a front view, in Fig. 2 is a side view, in Fig. 3 is an embodiment with an output parallel to the contact part, and Fig. 4 is an embodiment with an output located parallel to the support part. The positions in the drawing indicate:

1 - movable knife contact;

2 - contact part;

3 - supporting part;

4 - conclusion;

5 - bar;

6 - a core;

7 - limiter;

8 - spring.

Vrubny contact contains a movable knife contact 1 and a fixed contact made of a single conductive plate, structurally divided into a contact part 2, designed to interface with a movable knife contact, a support part 3 made with the possibility of fixing on the seat of the insulator mounting base, and output 4 to connect the power cable. It is possible to make a fixed contact in such a way that the contact and support parts that are interconnected are located in mutually perpendicular planes, and the output is placed either in the plane of the contact part (or parallel to it, see Fig. 3), or in the plane of the support part (or parallel to it see Fig. 4). When fixing the so-made cut-in contact on a horizontal mounting base, the output is located vertically (Fig. 3) or horizontally (Fig. 4). The fixed contact is connected to the strip 5, which is an electrically conductive profile plate, movably attached to the contact part by means of the rod 6, while the limiter is located between the contact part and the strip 7. The rod is located in the holes of the strip and the contact part with the possibility of longitudinal movement, at the ends of the rod clamps are located that limit the movement of the rod, and a spring 8 is located between the contact part and the corresponding clamp.

The device operates as follows. In the initial position, the movable and fixed contacts are open, the limiter prevents the strap from moving under the action of the spring until it comes into contact with the contact part to form a guaranteed gap when the open position of the cutting contact does not exceed the thickness of the movable knife contact. To ensure the flow of electric current through the cutting contact, the movable knife contact is introduced into the gap between the contact part and the bar, while the bar moves away from the contact part, compressing the spring. In the closed position of the cutting contact, the main part of the electric current flows directly between the movable knife contact and the fixed contact, and the spring provides reliable contact between them across the entire flat surface. Such a connection has a low electrical resistance, while the conductivity parameters remain stable during operation and wear of the contacting surfaces due to their reliable pressing against each other with a force from a compressed spring.

Claims (3)

1. Vrubny contact containing a movable knife contact and a fixed contact, characterized in that it is equipped with a bar, movably attached to the fixed contact and pressed to it by means of a spring with the possibility of placing a movable knife contact between the fixed contact and the bar. 2. Vrubny contact according to claim 1, characterized in that the fixed contact is made of a single conductive plate, structurally divided into a supporting part, a contact part and a terminal. 3. Vrubny contact according to claim 2, characterized in that the support and contact parts are perpendicular to each other, and the output is either parallel to the support part or parallel to the contact part.

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