Plasma arc torch and method for improved life of plasma arc...

H - Electricity – 05 – H

Patent

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H05H 1/34 (2006.01)

Patent

CA 2405081

A plasma arc torch and method for improving the life of the consumable parts of the plasma arc torch, including the electrode, the tip and the shield cap. The method includes turbulating gas as it flows over the exposed surfaces of the electrode, tip and shield cap to increase turbulence in the hydrodynamic boundary layer of the gas flow, thereby enhancing convective heat transfer. The result of enhanced cooling has improved consumable parts life. For example, to increase the turbu-lence of the gas flow over the outer surface of the electrode, the plasma arc torch electrode has a roughened, or textured outer surface formed with dimples, axially extending grooves or spiraling grooves formed in the outer surface of the electrode. The inner and outer surfaces of the tip and the inner surface of the shield cap are similarly textured.

L'invention concerne un chalumeau à arc de plasma et un procédé permettant d'améliorer la durée de vie des parties consommables de ce chalumeau à arc de plasma, parmi lesquelles l'électrode, la pointe et la capsule de protection. Ce procédé consiste à agiter le gaz lorsqu'il s'écoule sur les surfaces découvertes de l'électrode, de la pointe et de la capsule de protection afin d'accroître la turbulence de la couche frontière hydrodynamique de l'écoulement gazeux, améliorant ainsi le transfert de chaleur par convection. Le refroidissement amélioré permet d'obtenir une amélioration de la durée de vie des parties consommables. Par exemple, afin d'accroître la turbulence de l'écoulement gazeux sur la surface extérieure de l'électrode, le chalumeau à arc de plasma présente une surface extérieure rugueuse ou texturée pourvue d'alvéoles, de sillons axiaux ou de sillons en spirale. Les surfaces intérieure et extérieure de la pointe et la surface intérieure de la capsule de protection sont texturées de façon semblable.

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