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Centrifugal fan and impeller thereof

  • US 9,995,304 B2
  • Filed: 06/07/2013
  • Issued: 06/12/2018
  • Est. Priority Date: 04/10/2013
  • Status: Active Grant
First Claim
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1. An impeller, comprising:

  • a hub having a circumferential surface;

    a plurality of connecting structures disposed at intervals and on the circumferential surface of the hub, wherein any adjacent two of the plurality of connecting structures define a first minimum distance therebetween on the circumferential surface;

    an annular structure connected to the plurality of connecting structures, wherein the annular structure comprises an outer annular surface; and

    a plurality of blades disposed at intervals and on the annular structure, wherein any adjacent two of the plurality of blades define a second minimum distance therebetween on the outer annular surface, adjacent two of the plurality of connecting structures defining the first minimum distance are located between the plurality of blades and the hub, a first difference between any two adjacent first minimum distances is different from a second difference between any two adjacent second minimum distances, and a least common multiple of a number of the plurality of blades and a number of the plurality of connecting structures is a product of the number of the plurality of blades and the number of the plurality of connecting structures.

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