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Axial-flow fan

  • US 5,551,841 A
  • Filed: 06/20/1995
  • Issued: 09/03/1996
  • Est. Priority Date: 06/27/1994
  • Status: Expired due to Term
First Claim
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1. An axial-flow fan comprising a cylindrical casing having an inlet port at an upstream end thereof, and an outlet port at a downstream end thereof;

  • a motor disposed within the casing;

    stabilizer fins connecting the motor to an inner periphery of the casing;

    generally radially extending vanes mounted to the motor to be rotated thereby about an axis coinciding with a longitudinal axis of the casing;

    an inside wall member disposed within the casing upstream of the vanes and situated coaxially with respect to the casing at a radial inward spacing from the inner periphery of the casing to form therewith an annular flow path;

    the annular flow path having a generally radially outwardly facing inlet opening, and a generally axially facing outlet opening lying in a plane disposed substantially perpendicular to the longitudinal axis;

    a first radial distance between the inner periphery of the casing and radially outer edges of the vanes being no greater than a second radial distance between the inner periphery of the casing and the inside wall member;

    rotation of the vanes producing a main air flow from the inlet port to the outlet port of the casing, and a peripheral air flow from the inlet opening to the outlet opening of the annular path for opposing the creation of a leakage swirl and accompanying noise around the outer edges of the vanes.

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