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Centrifugal fan

  • US 20060171803A1
  • Filed: 01/26/2006
  • Published: 08/03/2006
  • Est. Priority Date: 01/28/2005
  • Status: Active Grant
First Claim
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1. A centrifugal fan comprising:

  • a scroll casing that has first and second flat base walls, a circumferential side wall covering the circumferences of said base walls, an air inlet that is opened in an axial direction being formed on a center portion of said first base wall and an exhaust port that is opened in a circumferential direction being formed on one portion of said circumferential side wall;

    a motor that is attached to a center portion of said second base wall at the inside of said casing so that a rotating shaft of the motor is perpendicular to said second base wall;

    an impeller that is fixed to said rotating shaft, the impeller having many blades along the outer region thereof; and

    a backflow prevention mechanism that prevents backflow from said exhaust port during fan halting by shutting an airflow path to said exhaust port, wherein said backflow prevention mechanism has a flat-shaped flap that is rotatably supported by said first base wall so that one side touching to said first base wall is a rotation axis, and the rotation axis is inclined with respect to the vertical direction so that the flap shuts the airflow path under its own weight in a horizontal-use position where the rotating shaft of said motor is horizontal.

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