| 摘要 |
<p>A hollow extruded axial flow fan blade is described which comprises two internal longitudinal reinforcing elements (ribs) (5) perpendicular to the blade profile (3) and in which are inserted through bolts (4) for fastening the blade to the round supporting bar inserted longitudinally in said blade, said bolts completely internal to said blade being parallel to the plane of revolution of the blade and passing diametrally and perpendicularly through the round supporting bar (2). <IMAGE></p> |
