| 摘要 |
PROBLEM TO BE SOLVED: To avoid the mixture of two kinds of fluid in a heat exchanger by discharging leak fluid outside heat transfer plates, even if cracks are generated in a brazing part in the peripheries of the passage ports of the two heat transfer plates, which are laminated and brazed to generate the leakage of fluid. SOLUTION: The brazing part 5 formed by sealing the parts in the peripheries of the passage ports of the two heat transfer plates 1 has a double seal structure including a second outside brazing part 5a and a third inside brazing part 5b with a liquid passing groove as a boundary. Both the ends of the fluid passing groove 20 are extended to cut-out parts 23 of the peripheral edge parts 1b of the heat transfer plate 1b. Thus, one kind of fluid leaking from the cracks of one of both the brazing parts 5a and 5b is discharged from the fluid passing groove 20 to the cut-out part 23 of the peripheral edge part 1b and exhausted outside.
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