RU207734U1 - Switching contact group of the circuit breaker - Google Patents

Abstract

The utility model relates to the field of electrical engineering, namely, it is a part of a circuit breaker. The technical result of the proposed technical solution is to increase the service life of the contact system. The increase in the service life of the contact system is achieved by the fact that the contact group of the circuit breaker contains a movable power contact (1) and a fixed power contact (2). In this case, the movable power contact (1) is located on the shaft, which is located in the holder (3). In this case, the holder (3) contains an arcuate convex surface section (5) and is arranged with the possibility of rotation in arcuate concave side guides (6). The movable power contact (1) is connected to the first spring (4) fixed in the holder (3), while the first spring (4) provides closing and opening of the movable power contact (1) with a fixed power contact (2). The fixed power contact (2) is connected to the second spring (7), which presses the said power contact (2) and absorbs the impact of the movable contact (1). The contact pads (8, 9) of the movable and stationary power contacts (1, 2) contain silver as part of the material and have a cylindrical surface. f-ly, 2 dwg

Description

The claimed utility model relates to the field of electrical engineering, namely, it is part of a circuit breaker, which is designed for infrequent operational current switching on and off in normal mode, as well as protection against overload currents and short circuits of distribution networks and electric motors.

As a prototype to the claimed technical solution, a modular circuit breaker (RU 181396 U1, 04/03/2018) was adopted, containing movable and fixed contacts. In this case, the movable contact is located in the holder.

In the prototype, the movable contact is connected to the quick-start bar. The quick-turn-on bar has a hook at one end that abuts against the projection on the switch body, and at the other end it has a projection with which the quick-turn bar abuts against the groove on the control handle rotation axis. In this case, the said protrusion does not allow the movable contact to move freely.

The technical problem to be solved is the need to reduce the transient resistance on the power contacts and prevent fusion during operation under load, which increases the service life of the automatic switch. In the prototype, the power contacts are heated, which leads to their wear. In this case, the pressure on the closed contacts decreases.

The technical result of the proposed technical solution is to increase the service life of the contact system.

The technical result is achieved in that the contact group of the circuit breaker containing a movable power contact and a stationary power contact, while the movable power contact is located on the shaft, which is located in the holder, while the holder contains an arcuate convex surface area and is rotatable in arcuate concave side guides. The movable power contact is connected to the first spring fixed in the holder, while the first spring provides closing and opening of the movable power contact with the stationary power contact; the stationary power contact is connected to the second spring, which urges the said power contact and absorbs the shock of the movable contact; The contact pads of the movable and stationary power contacts contain silver as part of the material and have a cylindrical surface.

In a particular case, the contact group contains three movable power contacts and three fixed power contacts, while the movable power contacts are located on one shaft.

The above set of essential features of the claimed technical solution ensures the achievement of the claimed technical result.

The author of the claimed technical solution made a prototype of this solution, the tests of which confirmed the achievement of the technical result.

FIG. 1 shows a general view of the contact group of the circuit breaker (side view).

FIG. 2 - contact group (rear view).

The switching contact group of the circuit breaker (Fig. 1) contains a movable power contact (1) and a fixed power contact (2). Preferably, the circuit breaker has three movable power contacts (1) and three fixed power contacts (2).

The movable power contact (1) is located on the shaft, which is located in the holder (3). By turning the holder (3), the moving and stationary power contacts (1, 2) are connected and disconnected. The movable power contact (1) is connected to the first spring (4) (Fig. 2), fixed in the holder (3). The first spring (4) provides the movable power contact (1) two positions: closing; opening under pressure of other parts in the circuit breaker.

The movable power contact (1) is well fixed in both one and the other position.

The holder (3) contains an arcuate convex section of the surface (5) and is located with the possibility of rotation in arcuate concave lateral guides (6), providing the closure of the movable (1) and stationary (2) power contacts.

The fixed power contact (2) is connected to the second spring (7), which presses the said power contact (2) and performs the function of shock absorption by the movable contact (1).

Unlike the prototype, springing the stationary power contact (2) provides amortization of the contact closure moment, namely, the strong closing impact of the upper movable contacts (1), also maintains constant pressure on the closed power contacts (1, 2) during wear. This increases the service life of the circuit breaker.

The contact pads (8, 9) of the movable and stationary power contacts (1, 2) contain silver as part of the material and have a cylindrical surface. Silver-containing cylindrical contact pads (8, 9) provide minimal heating due to a decrease in the transition resistance at the power contacts. This prevents fusion when working under load. It also increases the service life of the circuit breaker.

The silver content depends on the size of the circuit breaker and is 0.03-7.7 g.

When the handle of the control mechanism of the circuit breaker is cocked (not shown), the holder (3) is set in motion, on which the spring movable power contacts (1) are fixed. The holder (3) pivots in the side guides (6), ensuring the closure of movable and fixed power contacts (1, 2). In this case, the presence of the first and second springs (4, 7) and the implementation of the contact pads (8, 9) with a silver content ensures reduced wear of the contact surfaces.

The claimed technical solution can be manufactured at any electrical enterprise and will find wide application as lead-in switches for use in industry and at complex infrastructure facilities.

Claims (2)

1. A contact group of a circuit breaker containing a movable power contact and a fixed power contact, while the movable power contact is located on the shaft, which is located in the holder, while the holder contains an arcuate convex surface area and is rotatable in arcuate concave lateral guides, which is characterized by the fact that the movable power contact is connected to the first spring fixed in the holder, while the first spring provides closing and opening of the movable power contact with the stationary power contact; the stationary power contact is connected to the second spring, which urges the said power contact and absorbs the shock of the movable contact; The contact pads of the movable and stationary power contacts contain silver as part of the material and have a cylindrical surface. 2. The contact group according to claim 1, characterized in that it contains three movable power contacts and three stationary power contacts, while the movable power contacts are located on one shaft.

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