Patent ID: 6827555
Filing Date: 2004-12-07
Classification: F04D

Abstract:
A cooling fan comprising:a rotatable hub; and a plurality of generally V-shaped impellers that are angularly displaced from each other and that extend outwardly from said hub, each of said impellers having first and second impeller halves that extend outwardly from said hub and that are connected to each other so as to form cooperatively an angle therebetween, wherein each of the said impellers has a root connected to said hub, and a tip opposite to said root, said first impeller half having a first leading edge extending outwardly from said root to said tip, and a first trailing edge opposite to said first leading edge and extending outwardly from said root to said tip, said second impeller half having a second leading edge extending outwardly from said root to said tip and spaced apart from and substantially flush with said first leading edge in an axial direction relative to said hub, and a second trailing edge extending outwardly from said root to said tip and connected to said first trailing edge to form said angle.