Integral spring consumables for plasma arc torch using...

H - Electricity – 05 – H

Patent

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H05H 1/34 (2006.01)

Patent

CA 2268084

-29- Disclosed is a novel method and structure for contact starting a plasma arc torch. A translatable, electrically conductive component such as a nozzle or swirl ring in biased into contact with an electrode by a compliant spring element. A pilot arc is formed by first passing current through the electrode/component interface. Thereafter, the component is translated under the influence of gas pressure in a plasma chamber formed between the electrode and component, compressing the compliant element and initiating the pilot arc. The spring element may be maintained integrally with the nozzle, swirl ring, or a retaining cap, facilitating removal and replacement of the spring element with consumable components of the torch. Exemplary spring elements include wave spring washers, finger spring washers, curved spring washers, helical compression springs, flat wire compression springs, and slotted conical discs.

L'invention porte sur un nouveau procédé et une nouvelle structure pour amorcer par contact un chalumeau à plasma. Un composant électroconducteur ou un anneau de turbulence est mis en contact avec une électrode par un élément élastique à ressorts. On crée un arc pilote en faisant circuler du courant dans l'interface électrode/composant. Puis le composant se translate sous l'influence de la pression du gaz dans la chambre à plasma formée entre l'électrode et le composant, ce qui comprime l'élément élastique et amorce l'arc pilote. L'élément à ressorts peut faire partie de la buse, de l'anneau à tourbillons ou du bouchon de retenue, ce qui facilite la dépose et le remplacement de l'élément à ressorts avec les éléments consommables du chalumeau. Les ressorts utilisables peuvent être par exemple du type à rondelles ondulées, à rondelles à doigts, à rondelles courbes, à boudin comprimé, à fils plats comprimés ou à diaphragme.

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