| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a highly thermally efficient indirect type hot air generator suitable for miniaturization. <P>SOLUTION: The indirect type hot air generator includes a housing having an inlet for heated air and a combustion gas outlet on one side and an outlet for heated air and a combustion gas supply source on the other side, and a plurality of pipes disposed in the housing in parallel to each other and in a zigzag form. One end in each of the plurality of pipes is connected to the combustion gas supply source and the other end is connected to the combustion gas outlet with a folded part for direction reversal between the one end and the other end. A gap between the pipes that are adjacent to each other in a zigzag form is shorter than a gap between the pipes on the upper side and on the lower side with the folded part between which are the closest to each other, and the pipes satisfy a formula L/D≥200 where L represents a length and D represents an inner diameter. <P>COPYRIGHT: (C)2012,JPO&INPIT |
