H - Electricity – 05 – H
Patent
H - Electricity
05
H
H05H 1/34 (2006.01)
Patent
CA 2086821
MAG-69 ABSTRACT Plasma torch for transmitted arcs Parasite arcs which occur during the operation of plasma torches have an adverse economic effect and endanger important parts of the torch. Countermeasures of the prior art are only partly effective. Equipping the annular passage between the electrode and the surrounding nozzle which carries the plasma gas with an electrically insulating lining on the inside of the nozzle provides only partial protection. To insulate the segment of the inner wall part of a water-cooled nozzle adjacent to the end wall part by means of insulating parts penetrating the wall part in question from the outer segment is very expensive and complex, depending on the design and the choice of insulation materials. Therefore the invention proposes that secondary passages (43, 44) be distributed uniformly between the annular passage (17) for the plasma gas and an annular passage (33) between the nozzle endpiece (3) and the torch casing (16), uniformly over the circumference. Through these secondary passages (43, 44), a portion of the plasma gas is diverted and used to cool the nozzle end area and to displace electrically conducting deposits of dusts etc. and plasma arc flashbacks. A flange (29) which is guided so that it slides on this annular passage (33) also acts, by means of relative movements caused by temperature, to prevent the formation of electrical bridges by contaminants.
Bebber Hans J.
Rossner Heinrich-Otto
Tomalla Gebhard
Bebber Hans J.
Fetherstonhaugh & Co.
Mannesmann Ag
Rossner Heinrich-Otto
Tomalla Gebhard
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