Fan frame with diversion structure

Abstract

The present invention provides an improved fan frame with a diversion structure. A cooling fan includes a rotor, and fan blades spaced around the rotor at intervals. The fan frame positions the rotor and defines a diversion loop, which corresponds to the air outlet direction when fan blades are turning and has an expanding diversion surface. The fan frame has a diversion surface with diversion ribs spaced at intervals, the placement of the diversion ribs being in a vortex pattern without passing through the hypothetical point of the rotor center. The airflow generated by turning fan blades is guided by the diversion ribs and converted to outlet airflow in axial direction corresponding to the rotor, effectively reducing impact and friction of the gyrate airflow generated by fan blades against the frame diversion surface, lowering the noise level, making air exhaustion smoother, and improving the cooling efficiency of fan.

1 . An improved diversion structure of fan frame, said cooling fan comprises, a rotor, fan blades spaced around the rotor at intervals, and a frame to position the rotor; of which, the frame defines a diversion loop, which corresponds to the air outlet direction when fan blades are turning and has an expanding diversion surface; the feature of this invention is:
 the diversion surface has diversion ribs spaced at intervals.   
   
   
       2 . The improved structure defined in  claim 1 , wherein said diversion surface can be an inclined plane. 
   
   
       3 . The improved structure defined in  claim 1 , wherein the placement of said diversion ribs is a vortex design with the hypothetical extension line at the center of the rib not passing through the hypothetical point of the rotor center. 
   
   
       4 . The improved structure defined in  claim 1 , wherein said diversion ribs can be straight and flat or arched and curved.