| 摘要 |
<p>An axial fan in which the median line (B) of each blade (3) has a first radially-innermost, rearwardly-directed curved portion (B1) and a second radially-outermost, forwardly-directed curved portion (B2), the former portion being between 25% and 50% of the full radial extent of the blade. The profile of the blade is characterized in that its circular thickness (S) increases progressively from the interior to the exterior, and the pitch setting angle (W) of the profile decreases progressively from the interior to the exterior.</p> |
