Patent ID: 9568015
Date: 2017-02-14
CPC Classifications: F04D

Claim:
1. A centrifugal fan comprising: a fan frame having a base plate portion, a cover plate portion, and a lateral wall portion arranged between the base plate portion and the cover plate portion, wherein the cover plate portion has an inner edge forming an air inlet, and wherein the lateral wall portion has an air outlet; a stator assembly mounted in the fan frame; and an impeller mounted in the fan frame and comprising a rotating member, a plurality of blades and a connection ring, wherein the rotating member is rotatably coupled with the stator assembly, wherein the plurality of blades is arranged on an outer periphery of the rotating member, wherein each blade has a windward edge and a lateral edge, wherein the windward edge faces the air inlet, wherein the lateral edge faces the lateral wall portion, and wherein the connection ring is arranged on the windward edges of the plurality of blades; wherein the windward edge of each blade has a first coupling edge, wherein the connection ring has a second coupling edge coupled to the first coupling edge, wherein the windward edge between the first coupling edge and the lateral edge extends downwards starting from the first coupling edge and away from the cover plate, thereby forming a truncating portion between the connection ring and the lateral edge.