| 摘要 |
PURPOSE:To intercept any fresh gas in time of its flickering out in half-burnt, by making full use of power of a battery at the attraction of a solenoid valve, while keeping the solenoid valve in a state of attraction by electromotive force in a thermoelectric element after the solenoid valve being attracted. CONSTITUTION:Now opening a manual operation valve 5 to the full, when a burner 6 is ignited, a thermoelectric couple 13 is heated, producing thermoelectromotive power there. First, since a heated substance is lower than the setting temperature, a temperature control circuit 8 delivers its output, turning on a switch 12 and off a switch 15 respectively. AS a result, a coil 18 is excited whereby a solenoid valve 3 is attracted by magnetic force. When such a time that corresponds to a time constant depending upon a resistor 17 and a condenser 16 elapses, the thermoelectric couple 13 is amply heated and the thermoelectromotive power is being fed to a coil 14 so that the solenoid valve 13 is kept in a state of being attracted intact. |
