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High efficiency one-piece centrifugal blower

  • US 20020106277A1
  • Filed: 12/04/2001
  • Published: 08/08/2002
  • Est. Priority Date: 12/04/2000
  • Status: Active Grant
First Claim
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1. A centrifugal impeller mounted to rotate on an axis, the impeller comprising a plurality of blades, each having a leading edge and a trailing edge, an impeller hub, and a top shroud;

  • the blades defining an impeller diameter, a cylindrical area ratio, an outlet area, a minimum chord length, a blade meanline length and a blade solidity; and

    the top shroud forming an inlet to the impeller having an impeller inlet radius and an inlet area;

    said impeller characterized in that;

    a) it is injection molded in one piece;

    b) the impeller hub extends outwardly to a radius less than that of the impeller inlet radius;

    c) the blades extend outwardly from a radius less than the impeller hub radius;

    d) the top shroud has curvature in a plane that contains the impeller axis, and;

    e) the cylindrical area ratio is between 1.0 and 2.0.

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