IMPROVEMENTS IN TORCHES AND BURNERS FOR FLAME CULTIVATION AND FLAMING

摘要

The invention relates to an LPG combusting burner device for flaming and flame cultivation purposes and an improved hand-held torch that may incorporate such burner device. The burner device includes a primary burner (14) having at least one fuel delivery nozzle or jet (80) arranged within an open combustion chamber (71) defined within a burner skirt (70) such as to direct a stream of fuel towards a flame delivery opening of the skirt (70), and a vaporiser (18) located in heat exchanging proximity to the primary burner (14) and having a pressurisation chamber with an inlet for liquid LPG fuel and an outlet for gaseous LPG fuel, the inlet being arranged to be in fluid communication with a source of pressurised LPG and the outlet being in fluid communication with the nozzle of the primary burner. A metering duct (37) is located in close vicinity or within the vaporiser (18) and arranged to discretely limit the amount of liquid fuel entering the vaporisation chamber via its inlet, and a first pressure reduction duct (52) is provided in the flow path of gaseous fuel between the vaporisation chamber outlet and the nozzle of the primary burner (14) the first pressure reduction duct (52) arranged to impart a discrete pressure drop to gaseous fuel flowing therethrough between the vaporisation chamber (50) and the nozzle of the primary burner (14), the discrete pressure drop being such as to generate a low velocity combustion flame in the primary burner (14) during normal burner operation.