| 摘要 |
PURPOSE:To eliminate necessity to make use of a microswitch, by providing control part controlling an operating valve according to the existence of a direct current to be detected by a frame rod and an oscillation detecting circuit. CONSTITUTION:When a burner is in a standstill state, a movable contact point component 34 is held at a separated position from stationary contact point components 35, 35, a direct current to be applied to a frame rod through smoothing action of a burner 21 is sent to a printed circuit board 27 through a lead wire 25 and senses a flame of the burner 21. A solenoid valve 23, therefore, is kept at an open state by the printed circuit board 27, fuel is supplied to the burner 21 and burning is continued. When the burner is oscillated, the movable contact point component 34 is rocked, a weight 33 is touched to the stationary contact point components 35, 35, an oscillation detecting circuit 36 is shortcircuited, a direct current from the frame rod 24 is switched over, the solenoid valve 23 is switched over to a closed state, supply of fuel to the burner 21 is stopped and the burning is suspended. A safety device of the burner can be formed without making use of an expensive microswitch. |
