Axial flow fan

  • US 9,957,965 B2
  • Filed: 10/01/2015
  • Issued: 05/01/2018
  • Est. Priority Date: 10/07/2014
  • Status: Active Grant
First Claim
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1. A fan comprising:

  • a motor part arranged to rotate about a center axis extending up and down;

    an impeller including a plurality of blades extending radially outward, the impeller fixed to the motor part;

    a housing arranged to surround outer peripheries of the motor part and the impeller, the housing including a cylindrical inner circumferential surface and a cylindrical outer circumferential surface;

    a first circuit board positioned radially outward of the outer circumferential surface of the housing and electrically connected to the motor part; and

    a plurality of ribs arranged to interconnect the motor part and the housing,wherein the motor part includes an armature having coils, and a second circuit board electrically connected to the coils and the first circuit board,the housing includes an intake port which is an upper opening of the housing, an upper edge which surrounds the intake port, an exhaust port which is a lower opening of the housing, a lower edge which surrounds the exhaust port, a flange portion enlarged radially outward from the outer circumferential surface of the housing, and a circuit board fixing portion protruding from the outer circumferential surface of the housing and making contact with the first circuit board, andthe first circuit board is mounted with a plurality of electronic components and is disposed in a spaced apart relationship with the outer circumferential surface of the housing, the first circuit board being positioned radially inward of a radial outer edge of the flange portion and arranged to extend in an axial direction.

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