COOLED PLASMA TORCH AND METHOD FOR COOLING THE TORCH

摘要

The invention relates to a cooled plasma torch comprising an electrode (10), a plasma chamber (3) surrounding the electrode, and a coolant space (6) surrounding the plasma chamber (3) with at least one common wall (4) with the plasma chamber. The plasma torch further comprises means (12, 21, 24) for feeding a coolant medium into the coolant space (6). The coolant medium pressure is reduced in a fashion that causes a phase change in the coolant medium as it is passed from the coolant feed means (24) to the coolant space (6), whereby the plasma torch is cooled.