| 摘要 |
PURPOSE: To prevent corrosion of a tube element and leakage of refrigerant therefrom caused by punching by bending a pair of core plates in a manner of separating them from each other, by putting them in contact with corrugated fins on the outer side of a refrigerant passageway, and by separating each of the core plates from the corrugated fins with the interposition of a prescribed gap. CONSTITUTION: A pair of core plates 4 forming a tube element 2 are bent each in a direction separating from the other on the outer side beyond their joining part 4a at their peripheral edge. This bending puts the respective core plates 4 in contact with corrugated fins 3 on the outer side beyond tube-wall parts 5a on the upstream air side of the refrigerant passageway 5. Further at the windward end of the corrugated fins 3 the core plates 4 are separated from the corrugated fins 3 with the interposition of a prescribed gap 6 that communicates with an air passageway formed short of an adjoining tube element 2. This constitution enables preventing corrosion of the tube element 2 caused by dust, etc., in the air flow and leakage of refrigerant from the tube element caused by punching.
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