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Multi-blades fan device

  • US 5,511,939 A
  • Filed: 07/27/1994
  • Issued: 04/30/1996
  • Est. Priority Date: 02/19/1992
  • Status: Expired due to Term
First Claim
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1. A fan device comprising:

  • a casing of scroll shape having a tubular body portion having axially spaced first and second end walls and a tubular side wall connecting the first and second ends walls to each other, and a discharge duct connected to the body portion;

    the first wall having an opening that is coaxial with respect to the axis of the casing;

    a fan assembly arranged in the casing so that a passageway is created in the casing around the fan assembly so that the width of the passageway is gradually increased in a circumferential direction until the passageway is connected to the duct;

    said fan assembly being constructed of a base plate rotatably supported by the casing at the second wall, a plurality of blades fixedly connected to the outer periphery of the base plate so that the blades are circumferentially spaced;

    at least a portion of each of said first wall and said second wall being inclined downwardly in a radially outward direction; and

    said tubular side wall being inclined with respect to an axis of rotation of the fan assembly so that a bottom portion of the side wall is spaced further from said axis of the fan assembly than a top portion of the side wall.

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