EP 0465941 B1 19970423 - Plasma torch with transferred arc
Title (en)
Plasma torch with transferred arc
Title (de)
Plasmabrenner für übertragenen Lichtbogen
Title (fr)
Torche à plasma à arc transféré
Publication
Application
Priority
DE 4022111 A 19900711
Abstract (en)
[origin: EP0465941A2] The present plasma torch has a central electrode (10), a nozzle end piece (11) concentric thereto and a concentric torch jacket (73). There is an annular gap (27) for the passage of plasma gas between the electrode (10) and the nozzle end piece (11), and there is an annular channel (75, 76) between the nozzle end piece (11) and the torch jacket (73), the inner wall of which annular channel (75, 76) is partially formed by means of an insulating tube (36, 39) which electrically isolates the two parts (11, 73). <??>In order that this plasma torch can also be operated in particular using alternating current, largely without the risk of forming parasitic arcs, the annular channel (75, 76) is drawn back between the nozzle end piece (11) and the torch jacket (73) at least to the level of the coolant inlet and outlet (61, 62) of the torch jacket (73). At its rearward end, the annular channel (75) is in line connection (55) with a source (56) of a pressurised, gaseous medium. Such a torch is safe in operation even in an atmosphere having electrically conductive particles, such as metallic or foundry dusts and achieves long lives.
IPC 1-7
IPC 8 full level
B23K 10/00 (2006.01); H05H 1/28 (2006.01); H05H 1/34 (2006.01)
CPC (source: EP KR US)
H05H 1/28 (2013.01 - EP KR US); H05H 1/34 (2013.01 - EP US); H05H 1/3431 (2021.05 - KR)
Designated contracting state (EPC)
AT BE DE ES FR GB IT LU NL SE
DOCDB simple family (publication)
EP 0465941 A2 19920115; EP 0465941 A3 19920701; EP 0465941 B1 19970423; AT E152314 T1 19970515; CA 2045844 A1 19920112; DE 4022111 A1 19920123; DE 59108674 D1 19970528; ES 2100184 T3 19970616; FI 103250 B1 19990514; FI 103250 B 19990514; FI 913024 A0 19910620; FI 913024 A 19920112; JP H04229995 A 19920819; KR 100203089 B1 19990615; KR 920003820 A 19920229; NO 912474 D0 19910625; NO 912474 L 19920113; US 5206481 A 19930427; ZA 915358 B 19920429
DOCDB simple family (application)
EP 91110640 A 19910627; AT 91110640 T 19910627; CA 2045844 A 19910627; DE 4022111 A 19900711; DE 59108674 T 19910627; ES 91110640 T 19910627; FI 913024 A 19910620; JP 16841691 A 19910709; KR 910011761 A 19910711; NO 912474 A 19910625; US 72562891 A 19910702; ZA 915358 A 19910710