US 12,454,961 B1
Centrifugal fan
Hsin-Chen Lin, Taipei (TW); and Ing-Jer Chiou, Taipei (TW)
Assigned to ASUSTEK COMPUTER INC., Taipei (TW)
Filed by ASUSTEK COMPUTER INC., Taipei (TW)
Filed on Jan. 13, 2025, as Appl. No. 19/017,949.
Claims priority of application No. 113139724 (TW), filed on Oct. 18, 2024.
Int. Cl. F04D 29/28 (2006.01); F04D 17/08 (2006.01); F04D 29/42 (2006.01)
CPC F04D 29/281 (2013.01) [F04D 17/08 (2013.01); F04D 29/424 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A centrifugal fan, comprising:
an upper cover, having an upper air inlet, wherein the upper air inlet has an upper air inlet radius;
a lower cover, having a lower air inlet;
a fan frame, located between the upper cover and the lower cover, wherein the fan frame, the upper cover, and the lower cover form a space; and
a fan blade module, arranged in the space and comprising:
a hub;
a connecting ring, surrounding the hub and forming an inner ring region and an outer ring region around the hub;
a plurality of inner ring blades, connected to the hub and the connecting ring and circularly arranged in the inner ring region; and
a plurality of outer ring blades, connected to the connecting ring and circularly arranged in the outer ring region, wherein
the connecting ring has an inner radius and an outer radius, and the outer radius is greater than the upper air inlet radius; and
two adjacent outer ring blades are of different shapes,
the plurality of outer ring blades is divided into a plurality of blade sets that is circularly arranged in the outer ring region in sequence, each of the blade sets comprises at least three types of outer ring blades, and the at least three types of outer ring blades are arranged according to a preset rule.