| 摘要 |
PROBLEM TO BE SOLVED: To ensure strength in the thickness direction and heat exchange performance at least same as in the case where a corrugated fin is disposed without disposing the corrugated fin in a core 10 of a dron cup type heat exchanger. SOLUTION: A plurality of V shaped protrusions 14, 14... formed with press molding are provided on opposite bottom surfaces of a pair of core plates 11, 11... constituting a core 10. The V shaped protrusions 14, 14 provided on the one core plate 11 are brought into cross shaped contact, directed oppositely to the V shaped protrusions 14', 14'... provided on the other core plate 11.
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