| 摘要 |
PURPOSE:To obtain a combustion apparatus which always perform stabilized combustion, by controlling voltage to be supplied to an exhaust fan so that the temperature in exhaust gas detected by a temperature detecting element can keep the temperature corresponding to the change in the combustion rate. CONSTITUTION:A proportional control valve 7 controls the gas rate in order to make the outlet temperature in hot-water detected by an outlet hot-water temperature detector 9 equal to a set temperature. The temperature in exhaust gas is detected by a thermistor 11 and the rotation of an exhaust fan 3 is controlled by a controller 13 in order to keep the temperature in exhaust gas proper to the gas rate controlled by the proportional control valve 7. The temperature in exhaust gas in an exhaust gas duct 12 is raised when air pressure is applied to an exhaust port 4 and exhaust resistance is increased while exhaust rate is decreased. The rise of temperature in exhaust gas is detected by the thermistor 11. Receiving a signal from the thermistor 11, the controller 13 controls the supplied voltage to the exhaust fan 3, controlling it by increasing the rotating number of it, so that the temperature in exhaust gas becomes a set temperature. That is, the exhaust rate is kept at the optimum exhaust gas rate even though the exhaust resistance is changed; as a result, stabilized combustion can be obtained all the time. |
