| 摘要 |
A plasma gun assembly (12) for use in high temperature environments couples electrode and cooling water supplying hoses (30 and 32) to a plasma gun (18) via an extension arrangement having a conductive cathode extension tube (32) coaxially disposed within a conductive anode extension tube (48). The cooling water flows through the hallow interior of the cathode extension tube (72) to the plasma gun (18), then returns from the plasma gun via a passage formed between the outside of the cathode extension tube (72) and the interior wall of the anode extension tube (48). In this manner the anode and cathode extension tubes are cooled as well as the plasma gun. Powder and plasma gas are supplied to the plasma gun (18) by water-cooled tube arcangements in which such tubes (36 and 40) are surrounded by intermediate and outer tubes forming separate passages. Cooling water is coupled via fittings to flow through the passages formed by the intermediate and outer tubes (124 and 130) to provide cooling.
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