| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent deterioration of air-tightness and liquid-tightness of a header 8 due to a gap formed in a fitting portion of a flat tube 5 formed by fitting a vertical pair of first groove-shaped plate 1 and a second groove-shaped plate 2 to each other.SOLUTION: A tongue piece part 9 is formed in a position of a bulge portion 4 of a flat tube 5. An outer face of the tongue piece part 9 is aligned to be flush with a side wall 2a of a second plate 2. An end face 9a of the tongue piece part 9 is brought into contact with the side wall 2a.</p> |
