Structure of fan

Abstract

The present invention relates to an improved fan structure used for a heat sink, and such fan comprises an axle having a first fan member and a second fan member coupled to each end of the axle, and a plurality of leaves arranged in opposite directions are disposed on the first and second fan members such that when the fan is in use, the first fan member is installed onto a heat sink and the second fan member deeply embedded into the heat sink. The hot air conducted to the heat sink is drawn and discharged by the leaves in opposite directions such that the cold air drawn by the leaves of first fan member blows towards the fins of the heat sink to accomplish the convection of the outside cold air and the hot air from the heat sink, which can accelerate the discharge of the hot air.

What is claimed is:  
     
         1 . An improved structure of a fan, comprising: an axle; 
 a first fan member, being pivotally coupled to an end of the axle, and having a plurality of leaves arranged in the same direction and the leaves are kept apart from each other with a specific distance;    a second fan member, being pivotally coupled to another end of the axle, having a plurality of leaves arranged in the opposite direction to the leaves on the first fan member, and the leaves of the second fan member are kept apart from the leaves of the first fan member with a specific distance such that the leaves do not collide with each other when the first and the second fan members rotate, and when the fan is in use, the first fan member is installed on the heat sink, and the second fan member deeply penetrates into the heat sink to enable the hot air in the heat sink be drawn out by the second fan member and then discharged by the first fan member, and the first fan member blows the cold air from outside towards the fin of the heat sink such that the air of the heat sink and the outside air produce a convection to accelerate the heat dispersion.    
     
     
         2 . An improved structure of a fan as claimed in  claim 1 , wherein said second fan member has a smaller area than that of the first fan member.