Swirl ring and flow control process for a plasma arc torch

Details Swirl ring and flow control process for a plasma arc torch Swirl ring and flow control process for a plasma arc torch

B - Operations, Transporting

23

K

B23K 9/00 (2006.01) B23K 10/00 (2006.01) H05H 1/34 (2006.01)

Patent

CA 2081459

-42- Abstract Of The Disclosure A process and apparatus for reducing wear of an electrode in a plasma arc torch involves providing a substantial pressure drop in a flow of plasma gas from the torch to a plasma arc chamber defined by the electrode and a nozzle. The pressure drop is immediately before the plasma arc chamber. There is also a small, localized supply of the plasma gas located between the pressure drop and the plasma chamber. The supply is sufficient to stabilize the arc when the gas flow is cut off upstream of the pressure drop and the arc current is cut off very shortly thereafter. The pressure drop is small enough to permit an adequate flow of plasma gas to the plasma arc chamber during normal operations, but large enough to isolate residual gas in the torch from the plasma arc chamber when the arc current is cut off. The apparatus is preferably a swirl ring with an annular pre-chamber fed by a set of choke holes to feed gas to the chamber and create the pressure drop. A set of swirl holes feed gas from the pre-chamber to the plasma arc chamber. 4436m

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