Heat-dissipating device and its manufacturing process

Abstract

A heat-dissipating device and its manufacturing process are provided for significantly increasing the number and size of blades so as to enhance the heat-dissipating performance. The heat-dissipating device has a plurality of blades arranged around the hub of the heat-dissipating device and there is an overlapped region formed between every two adjacent blades. A single mold is used to manufacture such a heat-dissipating device so that not only can the manufacturing cost be reduced but it can significantly increase the number and size of blades so as to increase the heat-dissipating efficiency.

What is claimed is:  
     
         1 . A process for manufacturing a heat-dissipating device having a body and a plurality of blades arranged around said body, wherein there is an overlapped region formed between every two adjacent blades, the process comprising the steps of: 
 providing a mold including a first mold portion and a second mold portion, wherein a separating line between said first mold portion and said second mold portion is positioned coresponding to the largest cross section of each blade of said heat-dissipating device;    applying a used material into a space defined in said mold for forming said heat-dissipating device therein so as to execute a forming step of said heat-dissipating device; and    stripping said first mold portion and said second mold portion along an inclined direction of blades, thereby fabricating said heat-dissipating device.    
     
     
         2 . The process according to  claim 1 , wherein said used material is one selected from a group consisting of an iron-containing material, metal and plastic.  
     
     
         3 . The process according to  claim 1 , wherein said first mold portion and said second mold portion are separated from each other through a toothed gearing mode during said stripping step.  
     
     
         4 . The process according to  claim 1 , wherein said body is formed as a cup-shaped hub.  
     
     
         5 . The process according to  claim 4 , wherein said body is provided with a central opening.  
     
     
         6 . The process according to  claim 5 , wherein said body is further provided with a plurality of heat-dissipating holes formed around said central opening.  
     
     
         7 . The process according to  claim 1 , wherein said body and said plurality of blades are integrally formed by injection molding.  
     
     
         8 . The process according to  claim 1 , wherein each of said plurality of blades is shaped as a structure selected from a inclined plate, a triangle, a trapezoid, a curved, an arcuate and a wing structure.