| 摘要 |
PURPOSE:To stabilize the combustibility and prevent the thermal efficiency from decreasing by a method wherein respective independent exhaust channels are provided on heat sources C, D and said channels are stabilized without being affected by other exhaust channel. CONSTITUTION:Two kinds of combustion burners 19, 20, and combustion chambers 21, 22 and heat exchangers 23, 24, corresponding to each burner, are arranged inside of an apparatus main body 18, one heat exchanger 23 is communicated with a exhaust cylinder part 25 of which end is faced to an exhaust top chamber 27 of an exhaust top 26. An exhaust communicating hole 41 having a small diameter is provided at an intermediate part of the exhaust cylinder part 25, the end of the exhaust communicating hole is connected to the sucking side of a fan 29. Hereupon, the combustion burner 19, the combustion chamber 21 and the heat exchanger 23; also the combustion burner 20, the combustion chamber 22, and the heat exchanger 24 are nameed generically as heat sources C, D. A fuel supplied to a gas introducing port 34 is controlled to be given a combustion quantity required for a gas control part 39 with a control part 40, then supplied into each gas supply pipe 35, 36. In this case, each heat source C, D is selectively operated either in simultaneous combustion or in independent combustion with the control part 40 and the gas control part 39. At the simultaneous combustion of the heat sources C, D, the assistant action of the suction force of the fan 29 in the heat source D can be obtained by providing the exhaust gas communicating hole 41, accordingly, the stabilized air supply condition can be achieved. |
