| 摘要 |
PURPOSE:To contrive the enlargement in high-load combustion and TDR (Turn Down Ratio) range in a combustion device for a heating system in which forced air supply is made through a fan, by a mechanism where in the combustion chamber walls are composed of fins and water tubes, with secondary air outlets being provided in stages in a part of the combustion chamber walls. CONSTITUTION:The amount of secondary air to be supplied via the No.1 and No.2 passages is properly adjusted through the adjustable dampers 6 and 7 respectively to be fed into the secondary air chambers 8 and 9. The secondary air then flows out of the secondary air outlets 10 and 11 to be directed uniformly at the flame forming in the combustion chamber 15. The secondary air jet stream sends the flame spreading all over the combustion chamber 15 so that the flame undergoes heat exchange at the heat exchanger 17 which is of one-piece construction with fin pipes to be let out of the exhaust port 18. In this way, the supply of secondary air enables large-capacity, high-load combustion, helping extend TDR control range. Besides, the combustion chamber walls designed to serve as heat exchanger help prevent rise in temperature of the secondary air chamber and keep secondary air from being heated excessively. This enables miniaturization of the burning system employing a small-size fan. |
