| 摘要 |
PURPOSE:To adjust combustion quantity automatically, by providing a control circuit which keeps a hot air temperature at a set value by an error quantity between a detected temperature and a set temperature and an addition circuit which adds present controlled variable stored by an analog memory to the error quantity. CONSTITUTION:Fuel is supplied by a solenoid pump SP, a temperature of hot air is detected by a temperature detector S and a combustion quantity of a burner is adjusted by a supply quantity of fuel through the solenoid pump SP. The temperature of the hot air is set up by a temperature setting device D. When the temperature of the hot air is varied to a setting temperature an error quantity is transmitted as output of an error amplifier C, which is applied to an inversion adder D. On the other hand, the error quantity is stored in an analog memory AM as a present controlled variable through an inversion instrument IN and added to output of a differential amplifier C, that is, the error quantity. With this, the temperature of the hot air can be kept constant at a setting value by adjusting the combustion quantity automatically without spoiling a stabilized combustion state. |
