Heat dissipation device with heat pipe

Abstract

A heat dissipation device includes a heat sink and a helical heat pipe assembly. The heat sink includes a hollow cylindrical body and a number of fins extending inwardly from an inner surface of the body to an axis of the body. The helical heat pipe assembly is wrapped on an outer surface of the body and helically extends along an axial direction of the body.

1 . A heat dissipation device comprising:
 a heat sink comprising a hollow cylindrical body and a plurality of fins extending inwardly from an inner surface of the body to an axis of the body; and   a helical heat pipe assembly wrapped on an outer surface of the body and helically extending along the axial direction of the body.   
   
   
       2 . The heat dissipation device of  claim 1 , wherein the fins each have a first end connected to the inner surface of the body and a terminal second end opposite to the first end, and wherein the second ends of the fins cooperatively define an aperture. 
   
   
       3 . The heat dissipation device of  claim 2 , wherein the second ends of the fins are spaced from each other. 
   
   
       4 . The heat dissipation device of  claim 3 , wherein the fins define a plurality of air flow path communicating with the aperture. 
   
   
       5 . The heat dissipation device of  claim 4 , wherein the helical heat pipe assembly is obtained by curving at least one heat pipe. 
   
   
       6 . The heat dissipation device of  claim 5 , wherein the helical heat pipe assembly comprises multi-turns wrapping the outer surface of the body of the heat sink, and wherein the multi-turns are spaced from each other. 
   
   
       7 . The heat dissipation device of  claim 6 , wherein the helical heat pipe assembly is formed by curving a first, second and third heat pipes, and adjacent turns of the first heat pipe are spaced by the second heat pipe and the third heat pipe. 
   
   
       8 . The heat dissipation device of  claim 7 , wherein the outer surface of the body of the heat sink defines a helical groove to receive the helical heat pipe assembly therein. 
   
   
       9 . The heat dissipation device of  claim 8 , wherein the helical heat pipe assembly is partially or wholly embedded in the groove of the body of the heat sink. 
   
   
       10 . The heat dissipation device of  claim 4 , wherein the heat dissipation device further comprises a fan comprising a frame and a blade module fixed to the frame, the blade module comprises a shaft and several blades extending outwardly from the shaft, the frame is mounted to a first side surface of the body with the shaft corresponding to the aperture and the blades corresponding to the air flow paths. 
   
   
       11 . The heat dissipation device of  claim 10 , wherein the body of the heat sink comprises a second side surface opposite to the first side surface, the second side surface is configured for thermally contacting a heat generating device. 
   
   
       12 . The heat dissipation device of  claim 10 , wherein the heat dissipation device further comprises a heat conducting base having a bottom surface for thermally contacting a heat generating device and a top surface thermally connecting with the helical heat pipe assembly. 
   
   
       13 . A heat dissipation device comprising:
 a heat sink comprising a tubular, cylindrical body and a plurality of fins extending inwardly from an inner surface of the body to an axis of the body, the fins each having a free end unconnected to the inner surface of the body, the free ends of the fins cooperatively defining an aperture communicating with two side surfaces of the body;   a plurality heat pipes disposed on an outer surface of the body and surrounding the outer surface of the body;   a fan mounted to one of the two side surfaces of the body.   
   
   
       14 . The heat dissipation device of  claim 13 , wherein the fins define a plurality of air flow paths communicating with the aperture. 
   
   
       15 . The heat dissipation device of  claim 14 , wherein the plurality heat pipes constructs a helical structure wrapping the outer surface of the body and helically extending a long an axial direction of the body. 
   
   
       16 . The heat dissipation device of  claim 15 , wherein the helical structure is formed by curving a first, second and third heat pipes and comprises a plurality of spaced turns wrapping the outer surface of the body, and wherein adjacent turns of the first heat pipe are spaced by the second heat pipe and the third heat pipe. 
   
   
       17 . The heat dissipation device of  claim 14 , wherein the heat pipes are parallel straight heat pipes disposed on a circumference of the outer surface of the body and extend along an axial direction of the body.