DE1044966B - Water-cooled tungsten electrode for high-pressure discharge lamps operated with high currents - Google Patents

Description

GERMAN

Water-cooled electrodes in which only the head of the electrode is made of tungsten and those with high ones Amperages used in high pressure discharge lamps are known. With these well-known Electrodes is a solid tungsten electrode head on the end of a serving as a power supply Pipe of a different type of metal attached, through which cooling water flows inside. Electrodes of this known design should work particularly economically. _ ίο

However, it has been shown that the known electrodes did not lead to the desired result, because due to the low thermal conductivity of the massive Tungsten head insufficient heat dissipation is achieved by the cooling water and thus the heat radiation predominates.

In the case of a high current load, there is a particularly disadvantageous effect when the electrode is ablated off, thereby giving the electrode an unacceptably short life for practical use Has.

In contrast, the invention leads to an electrode that has a longer service life and with the a significantly better heat dissipation is achieved. This is achieved in that according to the invention for receiving the cooling water and serving as a power supply pipe at its end with a metal disc is completed from a material with good thermal conductivity and this metal disc is intimately and well current- and thermally conductive with the thin, preferably 0.5 to 2 mm thick tungsten disk serving as the electrode head connected is.

In the case of the electrode according to the invention, the heat path within the tungsten body is kept short, which at high currents an electrode with particularly good efficiency results.

An intensely cooled electrode according to the invention can handle currents of 200 A without difficulty take over.

The electrode according to the invention is shown in exemplary embodiments in FIGS.

The electrode consists of the water-cooled power supply tube 1, the end of which is through a metal disc 2 made of copper or other highly thermally conductive material is closed.

A thin, preferably 0.5 to 2 mm thick tungsten disk 3 α or 3 b, which consists of very dense, preferably hammered, tungsten, is intimately connected to the metal disk 2 in a way that conducts electricity and heat. The water inflow for cooling takes place through a tube 4 arranged centrally in the electrode or in the tube 1.

Water-cooled tungsten electrode

for operated with high currents

High pressure discharge lamps

Applicant:

VEB Berlin light bulb factory,
Berlin O 17, Warschauer Platz 9-10

Dr. Ernst Neumann, Berlin-Mahlsdorf,

and Alois IhIn, Berlin-Biesdorf,

have been named as inventors

Claims (3)

Patent claims: 1. Water-cooled electrode for high-pressure discharge lamps operated with high currents, in which the head of the electrode is made of tungsten and is attached to the end of a tube of another type of metal serving as a power supply through which cooling water flows inside, characterized in that the for receiving the Coolant and serving as a power supply tube (1) is closed at its end with a metal disc (2) made of good heat-conducting material and this metal disc (2) is intimate and good current and heat-conducting with the thin, preferably 0.5 to 2, serving as the electrode head mm strong Wolf ramsdheibe (3 α or 3 b) is connected. 2. Wolf ram electrode according to claim 1, characterized in that the DC operation than Tungsten disc (3 α) acting on an anode to achieve a bell-shaped arc has a slightly protruding outer surface. 3. Tungsten electrode according to claim 1, characterized in that the DC operation as Cathode acting tungsten disc (3 &) a slight central elevation to fix the Has arc. Considered publications:
Patent No. 10 179 of the Office for Inventions and Patents in the Soviet-occupied zone of Germany.