| 摘要 |
PROBLEM TO BE SOLVED: To prevent unbrazing of an inner fin in a bending part neighborhood and a tube inner face, and to prevent deterioration of compressive strength of a tube in a flat tube formed by bending a middle part of a long plate material and inserted with the inner fin. SOLUTION: In the brazed flat tube 1 formed by mounting the inner fin on one side of a top face of the long plate material 10, bending its substantially middle part 10C into a U-shape so that both side rim parts turn to the same direction, overlapping the both side rim parts, and brazing the overlapped parts, a weak rigidity part 10d with small flexural rigidity is provided in the substantially middle part of the long plate material to prevent a spring back during bending of the plate material. The weak rigidity part comprises a thin part, a cutout part, or the like. COPYRIGHT: (C)2005,JPO&NCIPI
|
