| 摘要 |
A saw-toothed portion (5) is provided on a front edge (3a) of a grille vane (2a) which constitutes a blow grille of an outdoor unit. The tips of crests (5a) of the saw-toothed portion (5) are rounded. The height (H) of the crests of the saw-toothed portion (5) is 0.05 to 0.25 times the length (chord length) of the airfoil grille vane, and the crest pitch (S) of the saw-toothed portion (5) is 0.5 to 1.5 times the height of the crest. Thus a multiplicity of vertical vortices generate from valleys (5b) of the saw-toothed portion (5) to draw the air flow, which has a great flow velocity at locations away from a negative pressure surface of the grille vane (2a), toward the negative pressure surface, and to make it hard for the flow on the negative pressure surface side to separate, thereby reducing the noise.
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