Axial-flow fan

  • US 4,734,015 A
  • Filed: 06/26/1987
  • Issued: 03/29/1988
  • Est. Priority Date: 07/24/1982
  • Status: Expired due to Term
First Claim
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1. An axial-flow fan comprising a drive motor means, a scroll plate means surrounding an impeller means having a hub, an inner contour of said scroll plate means having a cylindrical configuration in a vicinity of an axial median plane of the fan and extending towards an inlet side of the fan and with an outlet side of the scroll plate means formed into a polygonal profile circumscribing an impeller diameter and accompanied by formation of corner areas, and a central, coaxial core means formed by the drive motor means, the impeller hub and a mounting flange for the drive motor means, said core means having an annular surface reduced in diameter towards the inlet side, the annular surface having an axial length at least about one-third of a length of the hub, and with respect to the axial median plane, the scroll plate means being asymmetrical in the corner areas and being cylindrical over a longer distance from the axial medial plane to the inlet side than to the outlet side and wherein the impeller means has an outside edge which extends from the inlet side of the fan into the corner areas.

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