Fan blade

Abstract

The present invention relates to a fan impeller structure, which includes a hub having a plurality of blades distributed around the periphery of the hub in a radial manner. The blade has a windward surface and a leeward surface; at least a flow-guiding section is disposed on the leeward surface and is preferably located near the end portion of the outer edge of the blade and is mounted in parallel to the radial direction of the fan impeller. Therefore, when air is sucked in from the top and bottom sides of the blade respectively, the heat-dissipation performance loss resulting from the mutual collision of the air flow is avoided due to the flow-dividing and flow-guiding effect of the flow-guiding section.

1 . A fan impeller structure, comprising:
 a hub;   a plurality of blades disposed in a radial manner around a periphery of said hub;   a windward surface and leeward surface located on each said blade; and   at least one flow-guiding section disposed on said leeward surface.   
   
   
       2 . The fan impeller structure of  claim 1 , wherein said at least one flow-guiding section is located near an end portion of an outer edge of said blade and is mounted in parallel to a radial direction of said fan impeller to divide said leeward surface of said blade into an upper portion and a lower portion. 
   
   
       3 . The fan impeller structure of  claim 1 , wherein an arc-like flow-guiding angle is formed on said flow-guiding section and over an intersection of said flow-guiding section and said blade respectively. 
   
   
       4 . The fan impeller structure of  claim 1 , wherein said blade is selected from one type of axial-flow blade and blower blade.