SU1749949A1 - High-pressure gaseous discharge lamp - Google Patents

Abstract

Use: high pressure gas discharge lamps. SUMMARY OF THE INVENTION: An external tube contains a discharge tube and an ignition unit consisting of a glow discharge starter, a resistor, and a bimetallic thermo sweep, interconnected in series. The elements of the ignition unit are connected in parallel with the discharge tube. One end of the starting electrode is connected between the glow starter and the thermo-bimetal breaker. The distance from the end of the discharge tube to the point of the bimetallic plate nearest to it is selected on the basis of the following relationship: t 14 P I h S -, where P is the nominal lamp power, W; I is the length of the working part of the thermo-bimetallic starter plate, mm; A is the specific bend of the thermo-bimetallic plate, (& C) 1; h is the distance between the contacts of the starter in the non-operating room temperature lamp, mm; S is the thickness of the thermo-bimetallic plate, mm. 2 Il. "M yo

Description

The invention relates to the electrical industry and can be used in the manufacture of gas discharge lamps.

A known high-pressure discharge lamp containing a discharge tube enclosed in an external flask filled with mercury, sodium and a Penning mixture (neon-argon), and a starting electrode in the form of an enclosing discharge tube of a helix connected to one of the main electrodes through a thermo-metallic disconnector.

Filling the burner with a Penning mixture and the presence of a starting electrode ensures reliable ignition of lamps from the mains

voltage of 220 V without additional ignition devices.

The disadvantage is the relatively low luminous flux, since the use of the Penning mixture as a starting gas leads to a decrease in the luminous flux of lamps by 15–20% against xenon-filled lamps as the starting gas.

The closest to the technical essence is a high-pressure discharge lamp containing a discharge tube installed in an external cylinder, a parallel ignition circuit connected to it consisting of a series-connected resistor, a thermo-bimetallic switch, a glow discharge starter, and

S

yu yu

four

Yu

a starting electrode, one end of which is connected to the point of connection of the indicated starter and breaker.

A disadvantage of the design of a high-pressure gas discharge lamp is the presence of a negative side effect, which is that the starting electrode in the lamp operating mode, which is under electric potential, increases the diffusion of sodium from the discharge tube, which dramatically reduces the lamp life.

The aim of the invention is to increase the lamp life.

To achieve this goal, in a known gas discharge lamp containing a discharge tube installed in an external cylinder, an ignition circuit connected in parallel to it, consisting of a series-connected resistor, thermal-bimetal disconnector, glow starter, and a starting electrode, one end of which is connected to a point the connections of the indicated starter and the breaker, the distance of the discharge tube end to the point of the bimetallic plate nearest to it is selected on the basis of the following relation: P

L 14

2-A

h S where P is the nominal lamp power, W;

I is the length of the working part of the thermo-bimetallic starter plate, mm;

And - the specific bend of the thermobimetallic plate,

h is the distance between the contacts of the glow starter, mm;

S is the thickness of the thermo-bimetallic plate, mm.

When the ratio is fulfilled in the operating lamp, the glow-discharge bimetallic plate is located in the temperature zone at which the contacts of the starter are in the open state. The breaker contacts in the operating lamp are also open, and the potential is not applied to the starting electrode, thereby reducing the diffusion of sodium.

one

P i

h -S

is observed

short-circuit contacts of a thermal-bimetallic starter plate of a glow discharge from heating by a gas-discharge cabin during lamp operation. In this case, the starting electrode is under electrical potential, increasing the diffusion of sodium from the discharge tube, and the lamp life is sharply reduced.

Figure 1 shows the gas discharge of a high pressure lamp;

Figure 2 shows a glow discharge starter with one thermo-bimetallic

plates.

The lamp contains an external flask 1, the discharge tube 2, the resistor 3, the thermo-bimetallic breaker 4, the glow starter 5, the starting electrode 6,

A glow discharge starter consists of a glass starter body 7, a thermo-bimetallic plate 8 of length I.

In the case of using a starter with two thermo-bimetallic plates

length I is the length of the working parts of the two plates.

The lamp works as follows. After a voltage is applied to the lamp, a glow starter 5 starts to operate. When the contacts open, high-voltage pulses are generated that are applied to the main and starting electrodes 6 until the lamp is ignited. In the operating mode of the lamp, the contacts of the thermo-bimetallic breaker 4 and the glow starter 5 are in the open state, and therefore the potential is not applied to the starting electrode.

Examples of specific performance

lamps are shown in the table.

The flask is made externally from glass C 40-1, the starting electrode is made of molybdenum LF-PA grade TU 48-19-355-84, with a diameter of 0.6 mm. Glow starter

The length of the working part of the thermo-bimetallic plate is 13 mm, the thickness is 0.3 mm, and the distance between the contacts is 1 mm. The gas discharge tube is made of polycrystalline alumina, filled with

xenon and dosed with sodium amalgam. The thermobimetallic plates of the razmikatel and strattera are made of material TB 149/79 GOST 10533-85. The resistor is a tungsten

spiral diameter of 0.9 mm, resistance of about 330 ohms.

Claims (1)

Claims of Invention Gas discharge lamp of high pressure comprising a discharge tube installed in an external cylinder, an ignition circuit connected in parallel to it, consisting of a series-connected resistor, a thermo-bimetal disconnector and a glow starter, and a starting electrode, one end of which is connected to the junction point said starter and breaker, characterized in that, in order to increase the service life, the distance L from the end of the discharge tube to the point nearest to it And the specific bend of a thermobimetall bimetallic plate is selected, the original plate, (Г1; d of the following relation: h is the distance between the contacts of starP 12 Ater of the glowing discharge in idle h S5 lamp at room temperature, mm; where P is the nominal lamp power, W; $ is the thickness of thermo-bimetallic I is the length of the working part of the thermobimet –starter plate, mm. the faceplate of the starter, mm; A is the specific bend of a thermobimetal plate, (Г1;  The increase in voltage on the laip is due to sodium diffusion. The plmpl goes out of operation when the voltage on it increases with 150-160 V Phases / FIG. 2