Plasma non-transfer arc torch

Details Plasma non-transfer arc torch Plasma non-transfer arc torch

H - Electricity

05

H

H05H 1/34 (2006.01) H05H 1/28 (2006.01)

Patent

CA 2476069

A plasma non-transfer arc torch comprising a front outer electrode having an exterior wall extending between a front end and a back end and defining a central longitudinal axis, a throughpassage defined by an interior wall and extending from the front end to the back end, and a cooling chamber disposed between the exterior wall and the interior wall. There is also means for cooling the front outer electrode. An insulating alignment body has a front end and a back end, a throughpassage extending from the front end to the back end, and a gas passage having an inlet disposed in fluid communication to the exterior of the insulating alignment body and an outlet disposed in fluid communication with the throughpassage of the insulating alignment body. The insulating alignment body is secured to the back end of the front outer electrode such that the throughpassage of the insulating alignment body is aligned with the throughpassage of the front cuter electrode, and the outlet of the gas passage is disposed in fluid communication with the throughpassage of the front outer electrode. A rear inner electrode assembly includes an electrode main body extending between a front end and a back end is mounted on the insulating alignment body at the back end thereof such that the electrode main body extends through the throughpassage of the insulating alignment body to terminate at the front end within the throughpassage of the front outer electrode. There is also means for cooling the rear inner electrode. Upon the presence of a voltage potential across the front outer electrode and the rear inner electrode, and the introduction of a suitable process gas into the inlet of the gas passage and thus to the throughpassage of the front outer electrode, the suitable process gas is ignited by electron flow caused by the voltage potential, to thereby create a plume of heat energy to emanate from the throughpassage of the front outer electrode.

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