PLASMOTRON Russian patent published in 2003 - IPC

FIELD: plasma working of metals, namely plasma surfacing, welding, cutting ferrous and non-ferrous metals. SUBSTANCE: plasma generation and protection nozzles 3, 4 respectively are provided in housing 1. Ducts 5 for supplying plasma generating gas are arranged in casing 2. Duct 6 is designed for supplying protecting gas. Front and rear insulation sleeves 7, 8 respectively are mounted in cavity of housing 1. Hollow electrode 9 is arranged in sleeves 7, 8. Front and rear insulation sleeves 10, 11 are mounted on housing 1; casing 2 is placed onto said sleeves. Plasmotron has system for common cooling housing 1, electrode 9, plasma generation nozzle 3 and casing 2. Cooling system includes pipeline 12, annular ducts 14, 15, 16 arranged respectively between housing 1 and electrode 9, between electrode 9 and pipeline 12, between housing 1 and casing 2; duct 17 in electrode 9 mutually connecting annular ducts 14 and 15; ducts 18 in housing 1 mutually connecting annular ducts 14 and 16; discharging duct 13 in housing 1. EFFECT: enhanced reliability of plasmotron due to improved efficiency of cooling and elimination of double arc forming. 2 dwg