Heat dissipation device

Abstract

An exemplary heat dissipation device includes a centrifugal fan comprising an air outlet, a fin assembly arranged at the air outlet, and a heat pipe comprising an evaporating section and a condensing section. The fin assembly comprises fins. The fins are stacked together with one above another along a central axis of the centrifugal fan. Each of the fins has at least a flange bent at a lateral side thereof. The flanges of the fins abut against each other and form a side face parallel to the central axis of the centrifugal fan. The condensing section is attached to and thermally contacts the side face of the fin assembly.

What is claimed is: 
     
         1 . A heat dissipation device comprising:
 a centrifugal fan comprising an air outlet at a lateral side thereof;   a fin assembly arranged at the air outlet, the fin assembly comprising a plurality of fins, the fins being stacked together one above another along a direction substantially parallel to a central axis of the centrifugal fan, each of the fins having at least a flange bent at a lateral side thereof, the flanges of the fins abutting each other and forming a side face substantially parallel to the central axis of the centrifugal fan; and   a heat pipe comprising an evaporating section and a condensing section, the condensing section being attached to and thermally contacting the side face of the fin assembly.   
     
     
         2 . The heat dissipation device of  claim 1 , wherein the centrifugal fan comprises a fan frame and an impeller mounted in the fan frame, the fan frame comprising a base plate, a side wall extending from an outer edge of the base plate and a cover plate connecting the side wall, the air outlet being defined in the side wall of the base, an air inlet is defined in the cover plate corresponding to the impeller. 
     
     
         3 . The heat dissipation device of  claim 1 , wherein the evaporating section and the condensing section each are flat, the evaporating section comprising a flat bottom face adapted for absorbing heat generated from a heat source, the condensing section comprising a flat side face perpendicular to the bottom face of the evaporating section, the flat side face of the condensing section thermally contacting the side face of the fin assembly. 
     
     
         4 . The heat dissipation device of  claim 3 , wherein the centrifugal fan comprises a fan frame and an impeller mounted in the fan frame, the fan frame comprising a base plate, a side wall extending from an outer edge of the base plate and a cover plate connecting the side wall, the air outlet being defined in the side wall of the base, an air inlet is defined in the cover plate corresponding to the impeller. 
     
     
         5 . The heat dissipation device of  claim 3 , further comprising a heat spreader, the bottom face of the evaporating section thermally contacting a top face of the heat spreader, a bottom face of the heat spreader being adapted for thermally contacting the heat source. 
     
     
         6 . The heat dissipation device of  claim 5 , wherein the centrifugal fan comprises a fan frame and an impeller mounted in the fan frame, the fan frame comprising a base plate, a side wall extending from an outer edge of the base plate and a cover plate connecting the side wall, the air outlet being defined in the side wall of the base, an air inlet is defined in the cover plate corresponding to the impeller. 
     
     
         7 . The heat dissipation device of  claim 6 , wherein the base plate comprises a fixing seat at a center thereof, and the impeller is fixed on the fixing seat. 
     
     
         8 . The heat dissipation device of  claim 7 , wherein a plurality of air inlets are defined in the base plate around the fixing seat, corresponding to the air inlet of the cover plate. 
     
     
         9 . The heat dissipation device of  claim 8 , wherein the air outlet is perpendicular to the air inlet of the cover plate and the air inlets of the base plate. 
     
     
         10 . The heat dissipation device of  claim 6 , wherein each fin forms an arc-shaped cutout at an end, the arc-shaped cutout is disposed near the impeller of the centrifugal fan. 
     
     
         11 . The heat dissipation device of  claim 6 , wherein the air outlet comprises a first portion and a second portion, an angle between the first portion and the second portion is an obtuse angle, the side face of the fin assembly being disposed in alignment with the second portion of the air outlet, air under an action of the impeller being blown to the fin assembly from the first portion of the air outlet. 
     
     
         12 . The heat dissipation device of  claim 1 , wherein the condensing section is flat and has a flat side face, and the flat side face of the condensing section is attached to and thermally contacts the side face of the fin assembly. 
     
     
         13 . A heat dissipation device comprising:
 a centrifugal fan comprising an air outlet at a lateral side thereof;   a fin assembly arranged at the air outlet, the fin assembly comprising a plurality of fins, the fins being stacked together one above another along a direction substantially parallel to a central axis of the centrifugal fan, each of the fins having at least a flange bent at a lateral side thereof, the flanges of the fins abutting each other and forming a side face parallel to the central axis of the centrifugal fan;   a heat pipe comprising a flat evaporating section and a flat condensing section, the evaporating section comprising a flat bottom face, the condensing section comprising a flat side face thermally contacting the side face of the fin assembly; and   a heat spreader, the bottom face of the evaporating section thermally contacting a top face of the heat spreader, a bottom face of the heat spreader being adapted for thermally contacting a heat source.   
     
     
         14 . The heat dissipation device of  claim 13 , wherein the side face of the condensing section is vertical to the bottom face of the evaporating section. 
     
     
         15 . The heat dissipation device of  claim 14 , wherein the centrifugal fan comprises a fan frame and an impeller mounted in the fan frame, the fan frame comprising a base plate, a side wall extending from an outer edge of the base plate and a cover plate connecting the side wall, the air outlet being defined in the side wall of the base, an air inlet is defined in the cover plate corresponding to the impeller. 
     
     
         16 . The heat dissipation device of  claim 15 , wherein the base plate comprises a fixing seat at a center thereof, and the impeller is fixed on the fixing seat. 
     
     
         17 . The heat dissipation device of  claim 16 , wherein a plurality of air inlets are defined in the base plate around the fixing seat, corresponding to the air inlet of the cover plate. 
     
     
         18 . The heat dissipation device of  claim 17 , wherein the air outlet is perpendicular to the air inlet of the cover plate and the air inlets of the base plate. 
     
     
         19 . The heat dissipation device of  claim 15 , wherein each fin forms an arc-shaped cutout at an end, the arc-shaped cutout is disposed near the impeller of the centrifugal fan. 
     
     
         20 . The heat dissipation device of  claim 15 , wherein the air outlet comprises a first portion and a second portion, an angle between the first portion and the second portion is an obtuse angle, the side face of the fin assembly being disposed in alignment with the second portion of the air outlet, air under an action of the impeller being blown to the fin assembly from the first portion of the air outlet.