| 摘要 |
PROBLEM TO BE SOLVED: To solve problems that pipes are abutted or welded only by one line contact, a heat transmitting area is narrow, and heat exchange performance of the pipes is insufficient in a heat exchanger wherein the pipes are put side by side along the longitudinal direction and kept in close contact and welded; and to achieve miniaturization of the heat exchanger and improvement of a manufacturing method. SOLUTION: In order to enlarge the heat transmitting area, the two pipes are kept in close contact along the longitudinal direction, the two-row pipes are wound so as to be adhered to each other along an outer surface of a cylindrical form, and the pipes are wound so as to be adhered adjacently to the two pipes next to the wound two pipes. When the pipes are wound to a restricted width, the second wound one is adhered and wound on the first wound one to the opposite direction as the first wound one is wound, and thereby, the pipes of the first wound one and the second wound one are abutted on each other. The contact between the first wound one and the second wound one is increased by brazing with each other, and not only the first wound one and the second wound one, but also a plurality of the wound ones are overlapped, and thereby the contact between the overlapped ones is also increased, and the pipes are adjacent. COPYRIGHT: (C)2006,JPO&NCIPI
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