Heat dissipation device with parallel and perpendicular fins

Abstract

A heat dissipation device includes a heat pipe, a first fin unit, a second fin unit, and a fan arranged on the first fin unit for drawing air from the first fin unit to the second fin unit. The heat pipe includes an evaporation section, a first condensing section and a second condensing section. The first fin unit includes a plurality of stacked first fins with a first channel defined between adjacent first fins. A notch is defined in the first fin unit receiving the evaporation section, and a canal is defined in the first fin unit receiving the first condensing section of the heat pipe. The second fin unit includes a plurality of stacked second fins. A second channel is defined between adjacent second fins perpendicular to the first channels. A passage is defined in the second fin unit receiving the second condensing section of the heat pipe.

What is claimed is: 
     
         1 . A heat dissipation device, comprising:
 a heat pipe comprising an evaporation section, a first condensing section and a second condensing section;   a first fin unit comprising a plurality of stacked first fins, a first channel defined between adjacent first fins, a notch defined in the first fin unit receiving the evaporation section, and a canal defined in the first fin unit receiving the first condensing section of the heat pipe;   a second fin unit comprising a plurality of stacked second fins, a passage defined in the second fin unit receiving the second condensing section of the heat pipe, and a second channel defined between adjacent second fins of the second fin unit, the second channels being perpendicular to the first channels; and   a fan arranged on the first fin unit for drawing air from the first fin unit to the second fin unit, the fan comprising a base wall, a top wall, an annular wall between the base wall and the top wall, and an impeller, the base wall, the top wall and the annular wall cooperatively defining a space for receiving the impeller therein, the impeller comprising a hub, a plurality of blades surrounding the hub, an annular ring arranged around the hub and interconnecting middle portions of the blades, and a plurality of poles extending outwards from the hub and connected to the annular ring.   
     
     
         2 . The heat dissipation device of  claim 1 , wherein a plurality of assistant fins extends radially from an outer side of the annular wall, an air inlet is defined in the base wall facing the first fin unit, and an air outlet perpendicular to the air inlet is defined in the annular wall facing the second fin unit. 
     
     
         3 . The heat dissipation device of  claim 2 , wherein the base wall, the top wall, and the annular wall are metal. 
     
     
         4 . The heat dissipation device of  claim 1 , wherein the first condensing section is parallel to the evaporation section, and the second condensing section is perpendicular to the evaporation section, the heat pipe further comprising a curved connecting section between the first condensing section and the evaporation section. 
     
     
         5 . The heat dissipation device of  claim 1 , wherein the fan is a centrifugal fan.