| 摘要 |
PROBLEM TO BE SOLVED: To improve a corrosion resistance by providing a sacrificing layer having a potential lower than that of a core material on the outer surface of a flat plate in a lamination type heat exchanger in which a tube element forming one end part in the direction of lamination has the flat plate. SOLUTION: Protruding parts 25 and 26 are expanded in parallel on an inlet/outlet passage plate 24 by a press working. In one end part of the protruding part 25, an inlet port is provided with an annular protrusion formed by a burring working. In the end part at the same side of the protruding part 26, an outlet port is provided with an annular protrusion formed by a burring work. Then, the inlet/outlet passage plate 24 is connected to a flat plate 16, so that an inlet passage communicating with the inlet port and an outlet passage communicating with the outlet port are formed between the inlet/outlet passage plate 24 and the flat plate 16. A sacrificing layer 36 having a low potential is provided on the outer side surface of the inlet/outlet passage plate 24 and a brazing material 37 is provided on an inner side surfaces. Thus, the corrosion of the sacrificing layer is prevented so that a core material is prevented from being corroded.
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