Arc plasma torch having tapered-bore electrode

Details Arc plasma torch having tapered-bore electrode Arc plasma torch having tapered-bore electrode

B - Operations, Transporting

23

K

B23K 10/00 (2006.01) H05H 1/34 (2006.01)

Patent

CA 2087548

An arc plasma torch having a tapered-bore electrode provides a long, columnar plasma arc. The torch includes a torch housing, a tapered-bore electrode, a gas-constricting nozzle, and a swirling gas flow generator. The electrode is mounted within the housing and has a closed inner end and an open outer mouth. The electrode has a longitudinally extending, tapered bore. The bore has its largest dimension at the mouth. The nozzle has a bore and is also mounted within the housing. The nozzle is in axial alignment with, forwardly spaced with respect to and insulated from, the tapered-bore electrode. The torch introduces a swirling flow of gas at a location intermediate the electrode and the gas-constricting nozzle, resulting in gas flowing past the electrode during use of the torch. In operation, an electric arc emanating from the electrode ionizes the gas flow.

Torche à électrode creuse produisant un jet de plasma d'arc long et concentré. La torche de cette invention comporte une enveloppe extérieure, une électrode à canal de section tronconique, une buse convergente et un dispositif assurant un écoulement turbulent de gaz. L'électrode, placée à l'intérieur de la torche, est fermée à l'extrémité où le canal présente le plus petit diamètre et ouverte à l'autre extrémité. La buse, également à l'intérieur de la torche, est placée en avant et dans l'axe de l'électrode, de laquelle elle est isolée. Le flux turbulent de gaz est introduit entre l'électrode et la buse. En cours de fonctionnement, le gaz est ionisé par l'arc électrique émanant de l'électrode.

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