Combination axial-flow fan

Abstract

A high-performance low-noise combination axial-flow fan includes a fan hub that has a center connection portion for the connection of a fan motor shaft and a plurality of mounting grooves equiangularly spaced around the periphery, and fan blades each having a wedge block disposed at the inner end for insertion into one mounting groove to secure the respective fan blade to the fan hub so that the fan blades are radially fastened to the fan hub and no gap is seen between each two adjacent fan blades when viewed from the front side.

1 . A combination axial-flow fan, comprising:
 a fan hub, said fan hub comprising a center connection portion for the connection of a fan motor shaft and a plurality of mounting grooves equiangularly spaced around the periphery thereof, each said mounting groove having an open side disposed at a rear side of said fan hub; and   a plurality of fan blades, each said fan blade comprising a wedge block disposed at an inner end thereof insertable through the open side of one said mounting groove to secure the respective fan blade to said fan hub.   
     
     
         2 . The combination axial-flow fan as claimed in  claim 1 , wherein each said mounting groove is a dovetail groove. 
     
     
         3 . The combination axial-flow fan as claimed in  claim 2 , wherein the wedge block of each said fan blade is a dovetail block.