| CPC H05K 7/20136 (2013.01) [F04D 17/16 (2013.01); F04D 29/281 (2013.01)] | 14 Claims |
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1. A centrifugal heat dissipation fan of a portable electronic device, and the centrifugal heat dissipation fan comprising:
a hub;
a plurality of metal blades, disposed surrounding the hub, the metal blades comprising a plurality of radial dimensions, and structures of the metal blades with a shorter radial dimension are parts of structures of the metal blades with a longer radial dimension, wherein the metal blades having different radial dimensions form at least two ring areas, and distribution numbers of the metal blades in the at least two ring areas are different from each other; and
at least one ring, surrounding the hub and connecting the metal blades, wherein the metal blades having different radial dimensions divide a periphery of the hub into a first ring area, a second ring area, a third ring area, and a fourth ring area, in which a radial dimension of the first ring area is smaller than a radial dimension of the second ring area, the radial dimension of the second ring area is smaller than a radial dimension of the third ring area, and the radial dimension of the third ring area is smaller than a radial dimension of the fourth ring area, and the metal blades comprise a plurality of first blades, a plurality of second blades, a plurality of third blades, and a plurality of fourth blades, the first blade extends from the hub to the fourth ring area through the first ring area, the second ring area, and the third ring area, the second blade extends from the second ring area to the fourth ring area through the third ring area, the third blade extends from the third ring area to the fourth ring area, and the fourth blade is located in the third ring area,
wherein a distribution of the metal blades in each of the first ring area, the second ring area, the third ring area, and the fourth ring area adopts an aperiodic distribution to disperse a noise peak energy generated by the centrifugal heat dissipation fan.
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