SU77116A1 - Mining explosion-proof lamp - Google Patents

Description

The subject of the invention is a mine explosion-proof lamp.

A distinctive feature of this lamp is the use of a vacuum switch, built-in. between the walls of the glass cap to automatically break the lamp power supply circuit when the protective cap is damaged.

FIG. 1 shows the proposed lamp in the section; in fig. 2-shows the connection of the patrop with the cap through a vacuum switch.

From the inner cavity of the cap 1, consisting of two glass pillars 2 and 5 and constituting one well with a vacuum switch, air is exhausted to a pressure of 0.25 atm. The cap J is fixed in a colp made of plastic. The latter is connected to the chuck threads 3 and 6. Hermetic switch 7 is connected with a gland to the cable. The switch casing is designed in such a way that it allows the lamp to be disassembled only in the switched off state. A safety net 8 is placed on top of the cap.

The current closes from the single contact of the switch through the upper contact of the socket of the incandescent lamp 9, filament, base, current lead 10, thread 6, jumper 11, contact of the vacuum switch 12, contact 13, jumper 14, thread of the cartridge 15 at the fire of the switch 7.

With mechanical damage to the cap. as a result of the increase in pressure, the glass cylinder 3 rises up along the lapped walls of the glass cylinder 2 and at the same time breaks the luminaire current circuit by means of a spring copper bridge 16.

The subject of the invention is RZDNA explosion-proof, non-hazardous light. There is a double glass bell with a vacuum created between the walls, which is characterized by the use of a vacuum plug embedded in the small walls of the glass bell, which automatically breaks the power circuit of the lamp when the integrity of one of the glass caps is interrupted.

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