A torch device for chemical processes having three axially...

H - Electricity – 05 – H

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H05H 1/34 (2006.01) H05H 1/32 (2006.01)

Patent

CA 2117331

A plasma torch is designed for energy supply for example for chemical processes. The plasma torch comprises at least three solid tubular electrodes (1, 2 and 3) located coaxially inside one another. The electrodes (1, 2, 3) can be moved axially in relation to one another. They are preferably electrically insulated (5, 6, 7) from one another and have connections for electrical power (8, 9, 10). When three electrodes are used, the middle electrode (2) is used as an auxiliary electrode or ignition electrode. It is then coupled with one of the other electrodes (1). The distance to third electrode (3) is adapted to the working voltage in such a way that a jump spark is obtained when the working voltage is connected. During operation the auxiliary electrode (2) is withdrawn from the plasma zone thus preventing it from continuously forming the foot point of the arc.

Une torche à plasma est conçue pour fournir l'énergie nécessaire à des traitements chimiques, par exemple. La torche à plasma comporte au minimum 3 électrodes tubulaires (1, 2 et 3) monobloc, positionnées à l'intérieur l'une de l'autre coaxialement. Les électrodes (1, 2, 3) peuvent être déplacées axialement l'une par rapport à l'autre. De préférence, elles sont isolées électriquement (5, 6, 7) l'une de l'autre et elles comportent des connexions pour l'alimentation électrique (8, 9, 10). Lorsque trois électrodes sont utilisées, celle du milieu (2) est utilisée en tant qu'électrode auxiliaire ou électrode d'allumage. Elle est alors reliée à l'une des autres électrodes (1). La distance avec la troisième électrode (3) est adaptée à la tension de fonctionnement de telle sorte qu'une étincelle disruptive soit obtenue lorsque la tension est appliquée. Pendant le fonctionnement l'électrode auxiliaire (2) est écartée de la zone de plasma, lui évitant ainsi la formation continue du point de base de l'arc.

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