| 摘要 |
PURPOSE:To suppress the increase in burning quantity and attempt to prevent overheating of a burner by making smaller the rate of variation in the volume of supplied fuel against the rate of variation of the air quantity for combustion when the burning speed increases and the rotational speed of a burner motor exceeds a set speed. CONSTITUTION:A microcomputer 1 gives a rotational speed control signal fro a burner motor 6 to a phase control circuit 7 and controls the rotational speed of the burner motor so as to obtain a blast volume required for combustion. And, the rotational speed of the burner motor 6 is detected by the signal of a rotational speed detector 8. The frequency of a fuel pump 9 is controlled by giving the fuel control signal to a pump drive circuit 10 so as to obtain a volume of fed oil which corresponds to the blast volume. The pump frequency FP changes in proportion to the rotational speed FB of the burner motor [constant (a) of ratio] and in a burner 5 the combustion is made with a burning velocity which corresponds to load. When FB becomes larger than FBMAX due to the effects of noises, etc., the microcomputer 1 changes the constant (a) to a/k (k: 2 or 3) based on the signal from the rotational speed detector 8 to suppress an increase in the burning speed. |
