| 摘要 |
PURPOSE:To reduce the amount of cooling air during low combustion to reduce the amount of exhaust gas upon the low combustion automatically and increase the thermal efficiency of the titled device by a method wherein a mechanism, regulating the amount of combustion air, the amount of cooling air utilized for cooling a combustion tube and the inner tube of the combustion tube and the supplying amount of fuel individually and automatically, is provided. CONSTITUTION:Fuel gas is branched after passing through a governer 1 and comparatively small amount of gas passes through an orifice 2 and a low combustion solenoid piece 3 and is joined with the gas of much amount, with comes from a branch section through a high-combustion solenoid piece 4 to flow into a gas burner 6 provided in a combustion inner tube 5 automatically. When a low combustion signal is outputted, a high combustion solenoid piece 4 is closed automatically in the supply line of the fuel gas and gas flows only through the line of the low-combustion solenoid piece 3. Simultaneously, a combustion air damper 7 and a cooling air damper 10, which are fully opened by the operation of a control motor 18, are closed automatically. |
