| 摘要 |
PURPOSE:To obtain a heat exchanger surpassing in heat transferring property, by certainly joining a fin to a pipe by providing a part where no through-holes are provided around a fin collar which serves as a joining part of fin and pipe, and by raising the holeless part as high as a fin pitch. CONSTITUTION:A fin collar 3 is molded in such a manner that it is raised by a factor of the height 'H', which corresponds to the fin pitch of a heat exchanger from the center line in the direction of the height of a trapezoid shape. A fin '1a' and a fin '1b' are laid so that the upper end of a fin collar 3 is contacted to one surface of the other fin. Then a pipe 2 is inserted into the fin collar 3 provided to each fin '1a' and '1b' to expand the pipe 2, and the fin 1 and the pipe 2 are thermally joined to each other at the fin collar part 3.
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