RU156781U1 - ARC CHAMBER - Google Patents

Abstract

The arcing chamber of circuit breakers, consisting of side racks of insulating material with slots installed in the housing, and deion plates placed between them and fixed in their slots, characterized in that it is provided with upper and lower plates of steel with an anti-corrosion coating, located between side racks and fixed in their slots, and lower arc and upper arc horns made of steel with an anti-corrosion coating, while the upper plate is made of it is at an angle of less than 90 ° with perforations, and the lower plate is made shortened and doubled with the possibility of taking over the electric arc when it leaves the lower arcing horn, the lower arcing horn is designed to be placed on a fixed contact of the circuit breaker, and the upper arcing horn is located in the upper part of the arcing chamber, and the housing is made of impact-resistant technical thermoplastic resin based on polymers and equipped with ventilation grilles, renewed in it with the possibility of free exit of ionized gases from the combustion zone of the arc, while the deion plates are made of steel with an anti-corrosion coating and are equipped with narrow recesses made with the ability to quickly draw the arc into the arcing grid, and the ventilation grill is installed in the housing from the back of the deion plates with the possibility of providing free exit of ionized gases from the combustion zone of the arc.

Description

The utility model relates to electrical engineering, namely to electrical engineering, in particular to electrical switching devices, and can be used in arcing devices of circuit breakers.

The device is installed in each pole of the switching device and performs the function of extinguishing an electric arc in a limited volume when the maximum permissible switching currents flowing between the parts of the contact system through the switching device.

Known interrupter chamber (patent of the Russian Federation for utility model No. 71813), comprising a housing consisting of side posts made of electrical insulating material, and deionic plates made of copper-plated steel.

A disadvantage of the known arcing chamber is the inability to extinguish the electric arc arising between the parts of the contact system after passing through them the maximum permissible short circuit currents in a short period of time.

The technical task is to create a device that provides the ability to repeatedly turn off the emergency sections of electrical circuits, while maintaining stable performance and the minimum dimensions of the switching apparatus.

The technical result consists in minimizing the time of extinction of the arc, as well as in eliminating the spraying of molten metal formed during the burning of the arc.

The device is illustrated by illustrations, where

in FIG. 1 shows two projections of an arcing chamber;

in FIG. 2 - shows the arcing chamber in isometry;

in FIG. 3 - shows the arcing chamber in the case of a circuit breaker at the installation site;

in FIG. 4 - shows fixed contact with the arcing horn;

in FIG. 5 - shows the arcing chamber, bottom view.

The device contains:

1. side racks;

2. top plate;

3. deionic plates;

4. bottom plate;

5. lower arcing horn;

6. fixed contact;

7. upper arcing horn;

8. notches in deion plates;

9. housing;

10. ventilation grill housing.

The problem is solved due to the fact that the arcing chamber installed in the housing, consisting of side racks of insulating material with slots, deion plates placed between them and fixed in these slots, is provided with steel made of anticorrosive coating and placed between side racks and fixed in their slots, the upper and lower plates, as well as made of steel with a corrosion-resistant coating by the lower arc horn and the upper arc horn, while the upper layer and it is made curved at an angle of less than 90 ° and is equipped with perforations, and the lower plate is made shortened and double with the possibility of taking over the electric arc when it leaves the lower arcing horn, the lower arcing horn is arranged to place a circuit breaker on the fixed contact, and the upper the arcing horn is located in the upper part of the arcing chamber, the casing is made of impact-resistant technical thermoplastic resin based on polymers and is equipped with they can be used in it with the possibility of free exit of ionized gases from the arc burning zone by arcing gratings, while the deion plates are made of steel with an anticorrosive coating and are equipped with narrow recesses made with the possibility of quickly drawing the arc into the arcing grate, and the ventilation grill is installed in the housing from the rear deionic plates with the ability to provide free exit of ionized gases from the combustion zone of the arc.

The housing 9 is made of impact-resistant technical thermoplastic resin based on polymers, has special impact resistance, wear resistance, fire safety and environmental friendliness.

Side racks 1 are installed in the housing 9, equipped with slots and made of insulating material.

The upper plate 2 is made curved at an angle of less than 90 ° with perforations, which prevents the spraying of molten metal, while allowing ionized gases to freely leave the arc burning zone.

The deionic plates 3 are made of steel with an anti-corrosion coating, installed between the side posts 1 and fixed in their slots, which improves the retraction of the arc into the arcing grid and reliably keeps the arc within the arcing chamber, significantly reducing the likelihood of the arc leaving the arcing chamber.

Deionic plates 3 are made with narrow recesses 8, providing quick retraction of the arc in the arcing grid 10.

The bottom plate 4 is made of steel with an anti-corrosion coating, installed between the side posts 1 and fixed in their slots.

The lower plate 4 is made shortened and doubled to increase the resource, since it is it that takes over the arc when it leaves the arcing horn 5 of the fixed contact 6 and operates in the most unfavorable mode.

The lower arcing horn 5 arranged on the stationary contact 6 of the circuit breaker and the upper arcing horn 7 located in the upper part of the arcing chamber allow the arc to exit into the arcing chamber not from the contacts (movable and stationary), but from the arcing horns, which positively affects the safety the contacts themselves.

The ventilation grill 10 is installed in the housing 9 on the back of the deion plates 3 and is designed to provide free exit of ionized gases from the arc burning zone.

The process of extinguishing an arc occurs as follows:

When a short circuit occurs, the free-trip mechanism of the circuit breaker (Fig. Not shown) is activated, the movable contact (Fig. Not shown) moves away from the fixed contact 6.

A large current flowing through the contacts causes the appearance of an electric arc through which current flows.

Under the influence of electrodynamic forces, the arc is repelled from the contacts in the direction of the arcing lattice 10 and the arcing horns 5 and 7.

In fact, the arc is already burning between the arcing horns 5 and 7, the movable and fixed contacts themselves are damaged less than in the absence of arcing horns.

The deionic plates 3 of the arcing lattice have narrow recesses 8 in the center of the burning arc, which facilitate the rapid retraction of the arc into the lattice.

Further, the arc is divided into small arcs, the total arc voltage increases sharply and the arc goes out.

Thus, minimizing the time of arc extinction with the exception of spatter of molten metal formed during arc burning, the task of creating a device that provides the ability to repeatedly turn off emergency sections of electrical circuits while maintaining stable performance and the minimum dimensions of the switching apparatus has been solved.

Literature

1. RF patent for utility model No. 71813.

2. L.A. Rodstein, “Low-voltage electrical apparatus”, Energia Publishing House, 1964

Claims (1)

The arcing chamber of circuit breakers, consisting of side racks of insulating material with slots installed in the housing, and deion plates placed between them and fixed in their slots, characterized in that it is provided with upper and lower plates of steel with an anti-corrosion coating, located between side racks and fixed in their slots, and lower arc and upper arc horns made of steel with an anti-corrosion coating, while the upper plate is made of it is at an angle of less than 90 ° with perforations, and the lower plate is made shortened and doubled with the possibility of taking over the electric arc when it leaves the lower arcing horn, the lower arcing horn is designed to be placed on a fixed contact of the circuit breaker, and the upper arcing horn is located in the upper part of the arcing chamber, and the housing is made of impact-resistant technical thermoplastic resin based on polymers and equipped with ventilation grilles, renewed in it with the possibility of free exit of ionized gases from the combustion zone of the arc, while the deion plates are made of steel with an anti-corrosion coating and are equipped with narrow recesses made with the ability to quickly draw the arc into the arcing grid, and the ventilation grill is installed in the housing from the back of the deion plates with the possibility of providing free exit of ionized gases from the combustion zone of the arc.

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