Metal-brazing pulse burner

#1. Field of the Invention

#The present invention relates to a metal-brazing pulse burner used for brazing aluminum, copper or the like, and particularly, to an improvement of a metal-brazing pulse burner which reliably repeats an ignition and quenching in correspondence with a pulse control without quenching a flame of the burner which is intermittently ignited for controlling a temperature.

#2. Description of the Prior Art

#FIG. 1 is a partial side elevational view of a metal-brazing pulse burner according to an embodiment of the present invention; and

#FIG. 2 is a side view of a conventional pulse burner.

#FIG. 1 shows a metal-brazing pulse burner according to an embodiment of the present invention. The pulse burner includes a combustion air supply pipe 1 which connects an air pump 21 and a gas/air mixing pipe 3 and which is provided at its intermediate portion with a solenoid valve 13 opened and closed by a pulse signal; a combustion gas supply pipe 2 which is provided at its intermediate portion with another solenoid valve 14 opened and closed by a pulse signal and which connects a gas supply source 22 and the gas/air mixing pipe 3; a gas/air mixing pipe 3 being comprised of a pipe member having a diameter larger than those of the combustion air supply pipe 1 and the mixed gas supply pipe 5; and an air injection nozzle 4 which is connected to the combustion air supply pipe 1 to project therefrom along a central line of the pipe member, the nozzle 4 having an injection opening at its tip end which is located near an opening 6 of the combustion gas supply pipe 2 opened at a sidewall of the pipe member.

#The pulse burner further includes a gas/air mixing chamber 9; a burner head 10; a pilot air supply pipe 11 which is branched from the combustion air supply pipe 1 upstream of the solenoid valve 13 and is returned into the combustion air supply pipe 1 downstream from the solenoid valve 13 and which is provided at its intermediate portion with a flow rate adjusting valve 15; a pilot gas supply pipe 12 which is provided at its intermediate portion with a flow rate adjusting valve 16 and which is branched from the gas supply pipe 2 upstream of the solenoid valve 14 and returned into the gas supply pipe 2 downstream from the solenoid valve 14; a controller 23 for controlling the solenoid valves 13 and 14; an opening 6 which is opened at a sidewall of the gas/air mixing pipe 3; check valves 7 and 8; and a reducing valve 19.

#The operation of the metal-brazing pulse burner of the present invention which is arranged in the above manner will be described hereinafter.