Plasma torch initiated by short-circuit
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United States of America Patent
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May 11, 1993
Grant Date -
N/A
app pub date -
Nov 7, 1990
filing date -
Nov 8, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A plasma torch includes two tubular coaxial electrodes, at least one of which is axially movable between an operating position in which the movable electrode is spaced from the other electrode and an initiating position in which the movable electrode is in contact with the other electrode, thus establishing an electric short circuit so as to generate an electric arc upon rupture of the electric short circuit hen the mobile electrode is brought back to its operating position. Each electrode is contained in a support provided with a cooling circuit, through which a cooling fluid circulates. The cooling circuit associated with the movable electrode is provided with a seal which permits the electrode to be moved without creating any leaks in the cooling circuit.
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