| 摘要 |
PCT No. PCT/DE92/00183 Sec. 371 Date Sep. 23, 1993 Sec. 102(e) Date Sep. 23, 1993 PCT Filed Mar. 4, 1992 PCT Pub. No. WO92/16253 PCT Pub. Date Jan. 10, 1992.An impeller for a radial fan comprises a hub, a plurality of rotor blades each curved three-dimensionally at least within some areas, each of the rotor blades having a center part which extends substantially straight and radially from the hub, a curved primary part into which the center part merges tangentially and which extends in a radial direction around an axis extending substantially perpendicular to an impeller rotary axis, and a secondary part in which the center part merges tangentially in a radial direction and which is curved about an axis extending parallel to the impeller rotary axis and a guide ring located at an inflow region of the rotor blades. The impeller can have a frame, and an additional guide ring arranged at the axial distance from the guide ring and rigidly arranged with respect to the frame. The center part of the impeller can extend within a plane which is inclined at an angle to a radial line passing through the inner periphery of the center part.
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