SU67163A1 - Explosion-proof electric incandescent lamp - Google Patents

Description

The destruction of the bulb of an ordinary incandescent lamp in an atmosphere of explosive gases or vapors does not lead to an explosion if the filament is high enough inertia and at the time of destruction the current through the lamp breaks.

This phenomenon, which is explained by the inertia of the explosion, makes it possible in principle to design an explosion-proof incandescent lamp, for which it is necessary to connect the thread with a trouble-free switch.

Fireproof electric incandescent lamps, equipped with a switch in the power supply circuit of the filament body, which automatically operates when the lamp bulb collapses, are widely known.

According to the invention, an ionic discharge lamp is used as such a switch, the flask of which covers the bulb of the incandescent lamp. However, due to the well-known phenomena in the arc, the electrodes of the gas discharge gap are heated above the explosion-proof temperature (oxidized, for example, to 1200 ° C), and while maintaining

satisfactory service life of the electrodes must have significant thermal inertia.

Therefore, the use of a gas discharge gap (ion discharge) as a switch, although it makes the thread intrinsically safe (complete shutdown reliability), but does not allow for this reason to design an explosion-free incandescent lamp, since the discharge gap itself will be the cause of the explosion.

In order to avoid this, according to an additional invention, the ion discharger electrodes, having a high temperature, are isolated from the external environment by a metal grid. When the bulb collapses, the heating of the filament of the incandescent lamp stops, but the explosion does not occur due to the fact that the thread is low inertia, and the chain reaction of the explosion terminates on the grid.

In FIG. 1, 9 and 10 depict three options for switching on the filament of a Jaca I lamp in series with an ion switch and, FIG. 2, 4, 6, 8 — embodiments of the lamp; FIG. 3, 5, 7 - corresponding to these variants of the form of execution ioshnogo switch.

As can be seen from the drawing, the proposed iBO lamp of all variants is made with two flasks, one of which encloses the filament and the other is the ion discharge switch. In all cases, the ion switch is protected from damage by a metal cylinder.

FIG. 2 shows a two-base lamp, in a small flask 1 of which a compact gas-filled incandescent lamp 2 with a tungsten filament is placed. The thread is located so that the luminous flux along the axis of the lamp is minimal. In the part of the lamp, which is closed by a metal cylinder 5, there is an ion switch (Fig. 3) consisting of two metal sockets of the hemispheres 4 with openings with a diameter of 0.4 mm. Noluspheres 4 are fastened together. Inside the ion switch are oxidized electrodes 5 electrically disconnected from the hemispheres. The ion switch operates in an atmosphere of argon, neon or gels, or mixtures thereof - (neon-helium mixture) at a pressure of about 2 to 20 mm.

In the depicted “and FIG. 4 single-ended lamp, the external flask is similar to that in the first embodiment.

The part (Fig. 5), enclosed in a metal cylinder 3, contains an ionic switch with openings closed by a grid. Grid openings on the order of 0.16 mm. The filament ion switch is connected in series by means of a plug, which can belong to the fixture, then on the lamp. will be the terminals.

A single-ended lamp is shown in FIG. 6. Inner flask 2 contains the filament body. The outer flask has a wide stem and a pingeal connecting the open part of the outer flask with the closed part enclosed in a metal cylinder .3 (Fig. 7).

The ion switch has openings on the side surface, covered with a grid.

FIG. 8 shows a single-base lamp with an ionic switch located in the center. FIG. 9 and 10 show two variants of the L-shy switching circuit with an ion switch having a heating electrode.

To ignite the lamp (Fig. 9), the switch is set to the polishing point Ki, in which the resistance R turns on in series with the heating electrode. After 1-2 seconds the switch is switched to the Kz position, corresponding to the operating mode, in which the switch is turned on filament I.

FIG. 10 shows a circuit with two bit intervals. The arc is broken in the ion switch and automatically stops the discharge in discharge B, which is bridged by resistance C, capacitive (about 100 iJjJ-P) or ohmic (10-20 thousand h).

Subject invention

 1. An explosion-proof electric incandescent lamp equipped with a switch in the power supply circuit of the incandescent body that automatically acts when the lamp bulb collapses, characterized in that an ion discharge device is used as a switch, the bulb of which encloses the incandescent bulb.

2. In the lamp according to claim 1, use a protective grid placed around the corresponding part of the ion discharge bulb.

3. The form of embodiment of the lamp according to claim 1, wherein the flask enclosing the bulb of the incandescent lamp communicates with the flask of the ion discharge placed inside the lamp socket.

4. In the lamp according to claim 1, the use of an ion discharger equipped with a heated electrode.

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