| 摘要 |
<p>An axial flow fan has plural blades (3) secured at their root regions to a hub (2) for rotation therewith about a longitudinal axis (31). Tip regions of the blades are secured to a member (4) for rotation therewith, the member (4) having a blade tip support portion (35), the blade tips being secured to the blade tip support portion. The member (4) also has an air guide portion (34) disposed concentrically about the axis (31) beyond the axial extent of the blades (3) which is contiguous with the blade support portion (35). The air guide portion (34) defines a fan opening lying in a plane perpendicular to the fan axis (31).</p> |
