| 摘要 |
PURPOSE:To eliminate an inconvenience such as a displaced mixture of air as well as an influence over a combustion in a burner when air is mixed with combustion gas by a method wherein an air feeding pipe having a plurality of air injection holes is passed through a circumferential surface of each of fins to constitute an air blower. CONSTITUTION:A combustion box 1 has a heat exchanger 4 having several thermal absorption fins 3 through which a water-through pipe 2a passes and a full primary burner 5. An air blower device 9 is composed of an air feeding pipe 11 passes through some heat absorbing fins 3a of a water-through pipe 2a and having some rows of a plurality of air injection holes at its circumferential surface. Air fed by a fan 12 is injected and air is mixed into a space 13 around a secondary heat exchanger 4b where a drain is easily produced. At this time, combustion gas within the space 13 is diluted to decrease a dew point, resulting in that the heat exchanger 4 may not generate any drain at all. In addition, the air feeding pipe 11 is cooled by water contained in the water-through pipe 2a and no over-heating is performed. |
