RU2037908C1 - Gaseous-discharge lamp - Google Patents

Abstract

FIELD: electrical engineering. SUBSTANCE: gaseous-discharge lamp has burner of optically clear material filled with mercury and inert gas. Main and ignition electrodes electrically interconnected through limiting resistors are hermetically installed in each end of burner. Burner is attached to outer glass envelope. Components of element of lamp are so made that relation specified in description of invention is realized. EFFECT: improved operational efficiency and prolonged service life of lamp. 2 cl, 1 dwg, 1 tbl

Description

 The invention relates to the electrical industry, in particular, improves gas discharge lamps serving for general lighting purposes.

Known discharge lamps containing quartz burners with hermetically sealed electrodes, filled with an inert gas and a mercury-containing composition [1]
This design of gas discharge lamps, devoid of ignition electrodes, involves the use of a high-voltage pulse generated by ballasts (PRA) for igniting lamps. The magnitude of this pulse varies between 1.5-60.0 kV.

The closest in technical essence is a gas discharge lamp containing a burner made of optically transparent material, filled with at least mercury and inert gas, at each end of which one main and igniting electrode are sealed, electrically interconnected via limiting resistance, fixed in the external glass bottle [2]
In the described lamp, next to the main electrode in the immediate vicinity (1-3 mm) is the ignition electrode. In the absence of halide filling, when the lamp contains mercury and inert gas, this design allows the lamps to be ignited when a voltage is applied to the lamp burners, i.e. without additional ignition devices.

 Another drawback of the described GRL design is the instability of the ignition in the circuit without additional ignition devices, which leads to a decrease in their service life and a decrease in yield during manufacture. This is especially evident in relation to low-power GRL, in particular, lamps of the DRL 80 and DRL 50 types.

 The aim of the invention is to increase the service life of the lamps, reducing the material consumption of the structure and increasing the yield of suitable lamps.

 This is achieved by the fact that in a gas discharge lamp containing a burner of an optically transparent material filled with at least mercury and an inert gas, at each end of which is hermetically mounted one main and igniting electrode, electrically connected to each other through limiting resistance, fixed in the external a glass bottle, each of the main electrodes attached to the nearest ignition electrode.

· l_п.п.≥ 7,2 где К коэффициент пропорциональности, принимающий значение 1,0

;
A работа выхода электронов основных электродов, эВ;
Р_г давление инертного газа, кПа;
d_эл диаметр поджигающего электрода, мм;
R величина ограничительного сопротивления, кОм;
l_п.п. расстояние между поджигающими электродами, мм.The structural elements of the lamp are made in such a way that the following relationship is true:
25 ≥ K

· L _p.p. ≥ 7.2 where K is the proportionality coefficient assuming a value of 1.0

;
A work function of the electrons of the main electrodes, eV;
R _g inert gas pressure, kPa;
d _{el the} diameter of the ignition electrode, mm;
R value of limiting resistance, kOhm;
l _p.p. distance between ignition electrodes, mm.

 In the GRL according to the invention, the main electrodes are electrically connected through limiting resistance not with the opposite ignition electrode, but with a nearby one.

 In low-power GRL, this allows to improve the ignition of lamps, which means to increase the yield of lamps in the manufacture and the service life during operation. The connection of the main and ignition electrodes in such a way as in the lamp construction according to the invention also allows eliminating elements such as current leads (before they were necessary to connect the main electrodes to the opposite ones (through limiting resistances) in the design of mounting the burners on the leg).

 The drawing shows a connection diagram of the electrical elements of the GRL.

 Each of the main electrodes 1 is electrically connected through the limiting resistances (2) to the nearby ignition electrode 3. The rest of the circuitry for connecting the GRL to the power source 4 is traditional: ballast resistance (active, capacitive, inductive, combined) 5 is connected in series, the metal halide lamp circuit provides ignition device 6.

·I
I единичный вектор;
r² радиус кривизны поверхности проводника.The facilitated ignition of the GRL in the lamp structure according to the invention is explained as follows. The breakdown voltage between the ignition electrodes in the lamp of the invention is lower than the breakdown voltage between the main electrodes. This is a consequence of the higher electric field strength on the ignition electrodes (compared to the corresponding field of the main electrodes) having a diameter of less than 0.3 mm. It is known that the value of E _{at the} surface of the conductor is inversely proportional to the square of the curvature of the surface of the conductor
E

· I
I unit vector;
r ² radius of curvature of the surface of the conductor.

 The diameter of the firing electrode is typically less than 0.3 mm. In addition, there are points at the end of the ignition electrode, which further increase E. Of great importance is the coincidence of the direction of electric field lines with the direction of breakdown from the ignition electrode to the opposite ignition electrode (when connecting electrodes according to the prototype, the direction of the main mass of the ignition electrode power lines is not coincides with the breakdown direction of the main electrode - the nearby ignition electrode). This makes it possible to ensure a breakdown between the ignition electrodes in the lamp design according to the invention, more stable than the breakdown between the main electrode and the nearby ignition electrode in the prototype lamp, despite the much smaller distance between the electrodes (a much smaller electric field of the working part also affects the main electrode, which has a much larger wire diameter and does not have sharp points).

 In metal halide lamps, the design of the lamp according to the invention eliminates the phenomenon of electrolysis, since in this case the main and nearby ignition electrodes are electrically identical and there is no potential difference between them. Eliminating a phenomenon such as electrolysis can increase the lamp life.

 Examples of specific lamp designs are shown in the table.

 The implementation of the invention will allow, without changing the cost of the lamps, to increase their service life and yield, reduce the material consumption of the structure.

Claims (2)

 1. A DISCHARGE LAMP containing a burner fixed in an external glass cylinder made of an optically transparent material, filled with metal halide additives and / or a composition containing mercury and inert gas, at each end of which the main and ignition electrodes are sealed, electrically connected to each other through limiting resistors characterized in that each of the main electrodes is connected through a limiting resistor to the nearest ignition electrode. 2. The lamp according to claim 1, characterized in that the diameter of each ignition electrode, d _{e l} , mm, and the distance between them, l _{p p} , mm, are interconnected by the ratio

where K is the proportionality coefficient, which takes on the value

A work function of the electrons of the main electrodes, eV;
R is the resistance value of the limiting resistor, kOhm;
P _r inert gas pressure, kPa.

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