| 摘要 |
PURPOSE:To keep stable combustion with no breathing and to enable to promptly meet with rapid change of combustion, by employing an arrangement in which duty ratio of pulses having constant frequencies is variable with the state of combustion. CONSTITUTION:Flame controlling circuit 10 is used in combination with an electromagnetic pump 12 and a flame rod (not shown) provived in a combustion chamber 11 of a vaporizing combustor. To the combustion chamber 11, there are supplied air from a fan 13 and liquid fuel from a tank 14 by a pump 12. In the flame controlling circuit 10, an output signal afforded from a self-maintaining circuit 22 to the pump 12 is started in synchronism with oscillation of an oscillator 20 and diminishes with the trigger signal afforded from a timing circuit 18 to which output of the flame rod is supplied via wave-form shaping circuit 16. Thus, pulses having constant frequencies and a varied duty ratio are furnished as output signal so that combustion can be kept stable. |
