RU208385U1 - ARC EXTINGUISHING CHAMBER - Google Patents

Abstract

The utility model is part of a circuit breaker in a molded case (according to GOST R 50030.2-2010), designed for infrequent operational switching on and off of current in normal mode, as well as protection against overload currents and short circuits of AC distribution networks and electric motors. EFFECT: accelerated arc extinguishing by increasing the gas velocity at the inlet from the closed-type contact chamber. The arc chute, containing two housings made of ABS plastic, made with the possibility of installation into each other. Plates are installed in the first body, fixed in a fan-like manner on an insulating base in the grooves intended for them, and the plates are made with V-shaped cutouts. The second housing in the upper part contains a window for the emission of vapors and gases. 2 s. p. f-ly, 3 ill.

Description

FIELD OF TECHNOLOGY

The utility model is a part of a molded case circuit breaker (in accordance with GOST R 50030.2-2010), designed for infrequent operational switching on and off in normal mode, as well as protection against overload currents and short circuits of AC distribution networks and electric motors.

LEVEL OF TECHNOLOGY

From the patent RU 71813 (Open Joint Stock Company "Divnogorsk Plant of Low-Voltage Circuit Breakers" (RU), 03/20/2008) an arc-extinguishing chamber of a circuit-breaker is known, containing a housing made of electrical insulating material, a deionic grid consisting of transverse insulating partitions, into the grooves between which deionic plates with protrusions, while the arc-extinguishing chamber contains a body consisting of two parallel plates, and deionic plates made of copper-plated steel. On the inner surface of the casing plates, transverse insulating partitions are made. There are two grooves in the recesses between the partitions in each plate of the body.

The disadvantages of the known design are:

- open execution of the arc chute;

- the design of the plates is single and not demountable, fastened by two insulating textolite plates;

- low speed of extinction of the arc;

- increased heat generation when the contacts are opened;

- ingress of hot vapors and gases into the switch body, which leads to its damage.

ESSENCE OF THE USEFUL MODEL

The claimed design of the arc chute allows you to solve the technical problem inherent in the analogue from the prior art.

The technical result is an accelerated extinguishing of the arc by increasing the gas velocity at the inlet from the closed-type contact chamber.

The claimed result is achieved due to structural changes in the arc chute, which contains two housings made of ABS plastic, made with the possibility of installation into each other, while in the first housing there are vertically oriented plates placed on the insulating base in the grooves intended for them, and the plates are made V-shaped and placed parallel to each other, and the second housing in the upper part contains a window for emissions of vapors and gases.

In a particular example of implementation, the upper and lower plates are made of different sizes.

In another particular embodiment, the plates are made of different sizes.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 illustrates a general view of an arc chute.

FIG. 2 illustrates an exploded view of the arc chute.

FIG. 3 illustrates the gas ejection window.

IMPLEMENTATION OF THE USEFUL MODEL

FIG. 1 shows the main view of the claimed arc chute (10). The arc chute is designed in such a way that the electric arc formed when the contacts of the switching devices are opened is drawn into the arc chute. Having drawn into the gaps of the chamber plates, the electric arc lengthens, is broken by the chamber plates into several arcs that are smaller along the length, while it quickly deionizes, cools and extinguishes. The body of the arc chute consists of two parts (11, 12), which can be installed into each other. Housings (11, 12) are made of flame retardant ABS plastic.

The plates of the arc chute (121) are made of stainless steel and are housed in the housing (12). The arc plasma is drawn into the arc chute and broken up into a series of small arcs between the plates. Since a highly ionized plasma has a very high thermal conductivity due to a high concentration of free electrons, it cools, giving off part of the heat to the lattice plates, which entails deionization due to ion recombination and subsequent extinguishing of the arc. The manufacture of plates of the arc-extinguishing grating from a ferromagnetic material (usually steel) is due to the facilitation of the entry of the arc cord into the grating: the magnetic field of the arc tends to close itself along the ferromagnetic mass, as a result of which forces arise that draw the arc plasma into the arc-extinguishing grating. An additional advantage of ferromagnetic arcing plates is that electromagnetic forces not only draw the arc into the lattice, but also prevent the plasma from escaping from the other side of the arcing system.

The plasma of the electric arc accelerates to supersonic speeds when the switching contacts are opened. Therefore, the arc, entering the grating, is strongly decelerated due to aerodynamic drag. This resistance is reduced by proper design of the arc chute (10). The use of a lattice in the form of plates (121) with a V-shaped notch for moving the movable switching contacts in this notch and better coverage of the arc plasma column -for increasing interaction with the arc). Extinguishing the arc is also facilitated by gases released when it comes into contact with the plates (121) of the arc chute (10). A quick break in the arc leads to a decrease in energy release during tripping and short-circuiting, which leads to a decrease in the wear of the arc chute (10) and an increase in its service life. The closed structure of the arc chute (10) does not allow vapors and gases to escape into the circuit breaker body; the release of such products occurs in the upper window of the body (111) located after the plates (121).

The arc chute (10) consists of two parts (housings 11 and 12), separating from each other, for removing the plates (121) or replacing them.

The plates (121) are fan-shaped on an insulating base, are not electrically connected to each other and have a V-shaped cut. Plates (121) are inserted into one of the housings of the arc chute (12), into the provided grooves, then this case (12) is connected to another case (11), together forming a closed arc extinguishing system of the arc chute (10), which protects each pole of the circuit breaker ... This sophisticated design allows the plates (121) or housings (11 and / or 12) to be replaced as needed.

The closed walls of the arc-extinguishing chamber (10), which, under the influence of temperature, emit a gas that creates excess pressure, perform a greater efficiency of arc extinguishing.

Proof of the effectiveness of the design of the arc chute:

When tested in accordance with clause 8.3.8 of GOST R 50030.2-2010), it was confirmed that the rated operating short-circuit breaking capacity of the Ics apparatus is equal to the rated ultimate short-circuit breaking capacity Icu.

Claims (3)

1. An arc-extinguishing chamber containing two bodies made of ABS plastic, made with the possibility of installation into each other, while in the first body plates are installed, fastened in a fan-like manner on an insulating base in grooves intended for them, and the plates are made with V-shaped notches, and the second housing in the upper part contains a window for emissions of vapors and gases. 2. The arc chute according to claim 1, wherein the upper and lower plates are of different sizes. 3. The arc chute according to claim. 1, in which the plates are made of different sizes.

Images