Plasma burner for transferred electric arc
AssigneeFried. Krupp Gesellschaft mit beschrankter Haftung
InventorsHeinrich O. Rossner, Ulrich Scheffler, Gebhard Tomalla, Herbert Klein
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Abstract
A plasma burner has an annular passage extending along an insulated tube defining the outer wall of the electrode lance and located between the electrode lance and the multi wall burner shell to deliver the auxiliary gas outwardly of the plasma gas. The nozzle forming end of the electrode lance has a coolant circulation as has the burner shell and the annular passage extends substantially to the coolant inlets and outlets of the burner. The construction avoids the formation of parasitic arcs.
Claims19
A plasma burner for transferred electric arc, comprising:
- a central electrode;
- a nozzle end piece concentric with an end of said central electrode at a front of the burner and spaced from said central electrode by an annular gap for discharging a plasma gas from said burner;
- a burner shell surrounding said nozzle end piece at an end of said burner shell and extending axially from said end of said burner shell along said electrode, said burner shell being formed with a coolant inlet and a coolant outlet at a location axially spaced from and distal to said end of said burner shell, said burner shell defining an annular passage with said nozzle end piece communicating with a mouth spacedly surrounding said annular gap, said annular passage extending axially from said nozzle end piece distally at least to said location, an inner wall of said annular passage being formed by an electrically insulating tube separating said burner shell from said nozzle end piece;
- and
- means at a rear end of said annular passage remote from said nozzle end piece forming a pipe connection communicating with a source of a gaseous medium under pressure.
Dependencies are inferred from the claim text.