Patent ID: 7125226
Filing Date: 2006-10-24
Classification: F04D

Abstract:
1. An impeller for a radial-flow heat dissipating fan, comprising: a hub having a circumference; a plurality of blades surrounding the hub; and at least one supporting member connecting at least one of the blades to the circumference of the hub; and, wherein the impeller includes a first set of said blades and a second set of said blades that are alternately disposed, each of said second set of blades having a rectilinear inner edge, the air inlet side edge of each of the second set of blades having a radial length the same as that of the air outlet side edge of each of the second set of blades, the air inlet side edge of each of the first set of blades having a radial length smaller than that of the air outlet side edge of each of the second set of blades, thereby increasing an air inlet amount and smoothly changing incoming axial airflow into centrifugal flow.