TORCH OF LIQUID FUEL FOR OXYGEN CUTTING OF METAL Russian patent published in 1997 - IPC

FIELD: hand separating cutting of carbon steels with thickness up to 300 mm. SUBSTANCE: torch of liquid fuel has head which carries outer and inner cutting nozzles between which evaporation chamber is located. Additional blowpipe to heat evaporation chamber is made in the form of ring space open outwards on side of face of cutting nozzle and is positioned in outer cutting nozzle. Heating oxygen is fed into mixing chamber through another nozzle. Liquid fuel is also fed into it through conduit made in wall of chamber. Distance from another nozzle to conduit is not less than 40 diameters of mixing chamber. Mixture of fuel with oxygen is fed into mixing chamber through conduit in head. Portion of mixture hits clearance between nozzles and another portion of it gets into ring space which is additional blowpipe through conduits made in body of outer cutting nozzles. Conduits can have stepped shape, part of conduit with smaller hydraulic diameter is arranged on side of evaporation chamber. Permeable inserts can be inserted into conduits. Ratio of cross-section areas of mixing chamber and of conduit to supply liquid fuel into mixing chamber should be equal to number from row from 4 up to 300. EFFECT: enhanced operational efficiency. 7 cl, 8 dwg