| 摘要 |
PURPOSE:To enable the flame to be detected even at a non-conductive combustion plate by a method wherein a flame hole communicating with a combustion gas passage is formed at a part of conductive stopper plate for use in pushing down a circumference of the combustion plate so as to form a pilot flame. CONSTITUTION:Mixture gas is flowed through a recessed passage 9C at a flange part 9B, then passed through a flame hole 24 in a conductive annular stopper plate 23 placed at the outlet part of the passage so as to form a pilot flame 26. A conductive sensor rod 25 is arranged in such a way as it may be contacted with the pilot flame 26. With this condition, when a voltage is applied between the center rod 25 and an evaporating cylinder 6, a flame current is flowed through the flame hole 24 in the stopper plate 23 and the pilot flame 26 so as to enable a checking if a normal combustion is performed or not. Thereby, even at the non-conductive combustion plate, the flame can be detected by the conventional type of flame current sensor device. |
