| 摘要 |
<P>PROBLEM TO BE SOLVED: To improve heat exchange efficiency by holding an inner tube in a predetermined position within an outer tube, while expanding an heat exchange area. <P>SOLUTION: In a heat exchange duct in which a flexible inner tube 2 is arranged in the inside of an outer tube 1 for heat exchange between a ventilation passage 3 formed between the outer tube 1 and the inner tube 2 and a ventilation passage 4 in the inside of the inner tube 2, the inner tube 2 is folded to run obliquely so that the direction is changed by a holding member 5 arranged at a predetermined interval in a direction of the axis line of the outer tube 1, the holding member 5 includes an inner annular portion 6 and a plurality of circumferential annular portions 7 which externally contacts therewith, the circumferential annular portion 7 is supported by contacting the inside surface of the outer tube 1, and the inner tube 2 is made to progress in a zigzag manner by passing through the circumferential annular portion 7 and the inner annular portion 6 alternately. Since the length of the inner tube 2 can be considerably longer than that of the outer tube 1, the surface area of the inner tube 2 which serves as a heat exchange area can be secured large. <P>COPYRIGHT: (C)2012,JPO&INPIT |
