| 摘要 |
PROBLEM TO BE SOLVED: To provide a brazed flat tube which can be applied with reliable brazing by improving a solder spreading of an overlapped part of plate material both side rims in a flat tube formed by bending a long plate material in a center part. SOLUTION: Side rim curvature parts 10a and 10b bent in directions so as to face each other are formed on both side rim parts of the long plate material 10, a tip 10d of the side rim curvature part 10a in an inner side of the overlapped part of the both side rim parts is bent more outward than a radius of the side rim curvature part in the inner side toward an inner face of the side rim curvature part 10b in an outer side. A weak rigidity part 10f such as a thin part, or a cutout part with small flexural rigidity is formed in a neighborhood of the tip 10d to facilitate inward unbending of the tip afterward. By this, at least two solder spreading points P are secured, and since a gap between both side rim curvature parts can be reduced, the solder spreading can be extended. COPYRIGHT: (C)2005,JPO&NCIPI |
