SU1746432A1 - Gaseous-discharge lamp of high pressure - Google Patents

Abstract

Use: in the manufacture of high pressure gas discharge lamps. SUMMARY OF THE INVENTION: The lamp contains a discharge tube enclosed in an external flask and an ignition circuit connected in parallel to it, one of the elements of which is a circuit breaker with a U-shaped bimetallic plate located between two parallel leads. The parameters of the circuit breaker are made according to the relations: b 0485а s / qy s I l-i where a is the distance between the breaker terminals, mm; b - shelf between the branches of the bimetallic plate, mm; S is the thickness of the bimetallic plate, mm; A is the specific bend of the bimetallic plate, L is the working length of the bimetallic plate, mm; T - the maximum possible temperature of the heating of the release during manufacture or operation, &C; t is the temperature at which the opening of the contacts is open breaker, 2 Il. WITH

Description

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

A high-pressure discharge lamp is known, comprising a discharge tube installed in an external flask and an ignition circuit consisting of a glow-glow starter in series and disconnecting with a straight bimetallic plate.

The disadvantage of this lamp is unacceptable temperature variation of the operation of thermo-bimetallic breakers (from lamp to lamp), since the design of the breaker with a straight bimetallic plate does not allow for its manufacture to provide a stable contact pressure.

Unstable wide variation of the temperature of the thermal-switching device leads to radio interference and insulation breakdown in the case when the secondary power supply after short-term disconnection of the ignition circuit starts to operate before the discharge tube cools to a temperature at which the discharge tube can ignite, as well as an increase in time re-ignition of the lamp in case of low temperature

Closest to the present invention is a high-pressure discharge lamp containing a discharge tube installed in an external flask and an ignition circuit, one of the elements of which is a circuit breaker with a U-shaped bimetallic plate located between

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two parallel pins and attached at the end to one of them.

The design has a low lamp reliability due to a large variation in the temperature of operation of the switch, exceeding the allowable range.

The aim of the invention is to improve the reliability of the lamp.

This goal is achieved by the fact that a high-pressure gas discharge lamp containing a discharge tube installed in an external flask and an ignition circuit, one of whose elements is a circuit breaker with a U-shaped bimetallic plate located between two parallel terminals and connected at the end to one of them, the parameters of the switch are selected based on the following relationships:

b 0.85a.

l | 0.7o S | K5a-S

1 A-t L4f where a is the distance between the breaker terminals, mm;

b is the minimum distance between the branches of the U-shaped plate, mm;

S is the thickness of the bimetallic plate, mm;

A is the specific bend of the bimetallic plate, ° С;

L-working length of bimetallic plate, mm;

T - the maximum possible temperature of the heating plate, ° C;

t - the temperature of the opening of the contacts opened, ° C

Figure 1 shows the construction of a high pressure gas discharge lamp; 2 shows the disconnector structure.

The lamp contains a discharge tube 2 installed in an external flask 1 and an ignition circuit consisting of a glow discharge starter 3, a resistor 4 and a disconnector 5.

The disconnector design shows: a - the distance between parallel leads 6; b is the minimum distance between the branches of the U-shaped plate, mm; L- working length of the bimetallic plate, mm; S is the thickness of the bimetallic plate.

When the glow starter contacts open, high voltage pulses are generated. Resistor 4 limits the current passing through the starter 3 and the breaker 5, preventing their contacts from melting and welding together. Breaker 5 turns off the ignition circuit when the lamp is running

The dashed line shows the position of the bimetallic plate at the maximum heating occurring during lamp operation, or during lamp evacuation during manufacture, when, for better disinfection of the mounting parts, the lamp is passed through a heat chamber,

With L, the branches during maximum heating during lamp operation or during the manufacture of the circuit breaker or during the pumping out of the lamp close each other with a certain force that changes the trigger temperature of the circuit upwards.

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When L v d .; The bimetallic plate is slow to move at a normal technological spread between the branches.

0 of the bimetallic plate (± 0.15 mm) and the breaker terminals (+0.1 mm), and there is a significantly large variation in the opening temperature, which is up to + 20 ° C, which adversely affects the lamp operation.

After applying voltage to the lamp in the starter 3, the resulting discharge heats the bimetallic plate, which, bending, closes with the opposite end, after which the plate cools and opens.

The starter, when opened, produces a high-voltage pulse that is applied to discharge tube 2. If after

5 one-time actuation of the starter 3 in the discharge tube 2, the discharge does not occur, the starter 3 is triggered again.

After the occurrence of the discharge of the bottom of the tube 2 heats the breaker 5,

0 which disables the ignition circuit. Breaker 5 must operate before the starter 3, otherwise the lamp goes out.

The breaker in some cases it is advisable to place in a separate cylinder filled with an inert gas to prevent oxidation and spraying of the contacts.

Example. External flask is made of glass C40-1. The 340 W discharge tube is made of polycrystalline alumina, filled with sodium amalgam and xenon. The U-shaped bimetal disconnector plate is made of material of the brand TB 148/79 with a thickness of 0.3 mm. The findings of the uncoupled wire DKRIM 0.6 NP NP GOST 2179-75 are welded into a glass bead at a distance of 2.3 ± 0.1 mm from each other. The shelf between the branches of the bimetallic plate is 5

Claims (1)

Nena B-1.6 mm. Before fixing the bimetallic plate on the leads, the branches of the plate are compressed and inserted between the leads. The working length of the bimetallic plate is made L 20 mm. The trip temperature is t 120 ± 20 ° C. The maximum temperature to which the bimetallic plate is disconnected is heated, T 450 ° C occurs when the lamp is outgassed during pumping. In lamps made according to the invention, the ignition circuit can consist only of a bimetallic breaker of the above construction and a resistor acting as a heater. In this case, a high voltage pulse is generated when the contacts of the disconnector itself are opened. Claims of Invention A high-pressure discharge lamp containing a discharge tube installed in an external flask and an ignition circuit, one of the elements of which is a breaker with an LT-shaped bimetallic plate located between two parallel terminals and connected at the end to one of them, differing from so that, in order to increase reliability, the parameters of the disconnect are selected based on the following relationships: b 0.85 a. I0.7Q-S 4L4 Ch, 5a-3 . A-t - | A = T 0 where a is the distance between the breaker leads, mm; b is the minimum distance between the branches of the U-shaped plate, mm; S is the thickness of the bimetallic plate 5, mm; And - the specific bend of the bimetallic plate. L- working length of the bimetallic plate, mm; 0 T - the maximum possible temperature of the heating plate; t - the temperature of the opening of the contacts opened. Fig. / u 2 LT