SU851517A1 - Arc-extinguishing chamber - Google Patents

Description

(54) ARTS CHAMBER

 The invention relates to low voltage electrical equipment and can be used in contactors and circuit breakers, the arcing chambers of which should not have an ionized exhaust zone.

Arc-suppressing chambers are known in which flame-arresting devices are used to limit the ionized exhaust zone, which are a set of flat metal plates (flame arrester) that are installed in the path of outflow of highly heated ionized gases from the chamber tl.

The action of such flame arresters is based on intensive heat exchange between highly heated ionized gases and cold developed surfaces of metal plates of the flame arresting lattice, which drastically reduces the ionized exhaust zone. Closest to the present invention are closed-type extinguishing chambers consisting of an insulating body with exhaust openings made in the form of a base and a cover, contacts and a flame arresting grid formed from a set of metal plates 21.

In known chambers, the ionized exhaust zone is reduced to an even greater degree, however, to completely eliminate it with this design

5 also fails. And this means that in the assembly kit 1 the device must be provided with an additional volume corresponding to the ionized exhaust zone, the apparatus installed in it, within which it is not possible to place a conductor or grounded parts.

Tse: .invention - complete elimination of ionizing exhaust zone

15 arc chambers, a flame-absorbing grille, and consequently a reduction in the dimensions of the complete devices in which the apparatus is installed.

20 The objective is achieved by the fact that the arc chute is a closed-type chamber consisting of an insulating cIONOCHE enclosure with exhaust openings that are made as a base.

25 and kryaiks, contacts and a flame-arresting lattice, formed from a set of metal plates, are provided with an insulating partition with openings, which is installed between the plating-and-iron grid to the thos / high wall

The insulating body caps so that with the specified wall an additional cavity, we take holes in the insulating partition are displaced with respect to the slots in the insulating cavity.

Figure 1 shows the proposed camera, a longitudinal section; on Fig.2raz A-A in Fig.1; on fig.Z - camera, top view; figure 4 - section bb in figure 1.

The argillary chamber consists of arc-resistant insulating body, made in the form of base 1, the internal hollow of which is expanded in the area of contacts 2 and 3 and then passes smoothly into a zigzag narrow slot 4. A flame arrestor is placed above the base 1 in the cover 5, which has exhaust vents b. , made in the form of a set of metal plates 7, and an insulating partition 8 with openings 9 displaced with respect to the exhaust openings 6. Between the insulating partition 8 and the lid there is an additional cavity 10. The cover 5 is fastened to the case of the base 1 with screws 1 1.

The isolation wall 8 is in direct contact with the ends of the metal plates 7.

When the contacts 2 and 3 are opened, the electric arc is quenched in the arcing device of the camera. In the process of extinguishing, the arc thermally affects the environment (gas in the chamber volume, insulating walls, etc.), as a result of which an excessive pressure occurs in the reactor and a flow of highly heated ionized gases rushes towards the exhaust ports 6 (indicated by arrows on 2).

With the passage of these gases zzzol. The developed surfaces of the metal plates 7 of the flame arresting lattice between them are intense heat exchange, leading to a decrease in temperature and, consequently, of the conductivity of gases. Further effective cooling of the gases flowing out of the chamber occurs due to their sharp expansion at the entrance to the cavity 10 through the openings 9 in the insulating partition 8; due to intense turbulent gas flow inside the cavity 10. arising / due to the discrepancy between the arrangement of the holes 9 and the exhaust from

Versions b and leading to intensive mixing of the gas and its heat exchange with the walls of the cavity 10; finally, due to the subsequent sharp expansion of the gas as it flows through the exhaust ports 6 into the free space 5. As a result

the temperature and conductivity of gases flowing out of the chamber are so reduced that outside the chamber when they fall into the area of current-carrying or earthed parts of the complete device (control station, console, switch cabinet, etc.), they are no longer able to cause breakdown of the insulating gaps and 5 development of arc closures.

The proposed arc-suppressing chamber does not have an ionized high-voltage zone, and devices equipped with these chambers can be installed in the vicinity of live-carrying or grounded parts of complete devices.

Claims (2)

Invention Formula An arcing chamber of a closed type, consisting of an insulating body with exhaust openings, made in the form of a base and a cover, contacts and a flame arresting lattice formed from a set of metal plates, in order to reduce dimensions of complete devices for by eliminating the ionized exhaust zone, it is provided with an insulating partition with openings, which is installed between the flame arrester and the end wall of the lid 40 of the insulating body so that it forms with the said wall an additional cavity, with the openings in the insulating partition being displaced in relation to the exhaust openings in 45 .Insulation housing. Sources of information taken into account in the examination / 1. USSR author's certificate 81502, cl. H 01 H 9/36, 1950. 2. Mozalevsky A.V. and Rodshtein L.A. Contactors of direct and alternating current series KN2000.SborS5 nickname Electrosila. Issue 18, M-L., | GEI, 1E59, pp.19-28 (prototype).