Patent ID: 7806167
Filing Date: 2010-10-05
Classification: F28D,F28F,H01L

Abstract:
1. A heat dissipation device comprising: a heat sink comprising a base and a first fin group located above the base, the first fin group comprising a plurality of fins perpendicular to the base, a plurality of channels being defined between the fins of the first fin group, each of the fins of the first fin group comprising first and second side edges respectively at upper and lower portions of the first fin group, the second side edge having a length longer than that of the first side edge; two pairs of U-shaped heat pipes connecting the base and the first fin group, each heat pipe comprising an evaporating section received in the base and a condensing section extending in the first fin group, the respective condensing sections of the heat pipes being located at opposite lateral sides of the first fin group; first and second fans respectively attached to the opposite lateral sides of the first fin group, the first and second fans being arranged inclined to each other and facing the base, each of the first and second fans being oriented with an acute angle to the base; and a second fin group attached to the base and defining a plurality of channels facing the channels of the first fin group; wherein cooling air produced by the first fan blows towards the first fin group and the base and passes through the first fin group, and the cooling air heated by the first fin group and the base is drawn away from the fin group and the base by an action of the second fan.