| 摘要 |
A fin ( 6 ) is provided with insertion holes ( 22 ) for receiving heat exchange tubes and a rib ( 15 ) extending generally parallel to an outer edge ( 25 ) of the fin ( 6 ). The rib ( 15 ) is placed closer to the outer edge ( 25 ) than all the insertion holes ( 22 ) are. The rib ( 15 ) is formed on the fin ( 6 ) such that when an inside diameter of the insertion holes ( 22 ) is set as D [mm], a distance between a center of the insertion hole ( 22 ) nearest to the rib ( 15 ) and the outer edge ( 25 ) is set as L [mm], a distance between a center of the rib ( 15 ) and the outer edge ( 25 ) is set as La [mm], a width of the rib ( 15 ) is set as LL [mm], a thickness of the fin ( 6 ) is set as t [mm], and a height of the rib ( 15 ) is set as h [mm], then 0.4<La<(L-D/2-0.5), and 0.15<LL<0.5, 0.05<t<0.15, 0.5t<h<2.5t. |
