Patent ID: 7766076

Claim:
An apparatus for directing heat from a heat generating device comprising: a heat transfer plate configured for heat exchange communication with a heat generating device at a lower end; a fin stack comprising a plurality of flat substantially parallel heat exchange fins each having a central interior circular space defined by a substantially circular inner edge, said heat exchange fins stacked vertically with the center of their respective interior circular spaces aligned along a common axis and defining a vertical cavity and spaced apart to form a first airflow channel therebetween; a plurality of heat pipes and/or thermosyphon tubes secured in heat exchange communication with said heat transfer plate and said plurality of heat exchange fins; an elongated insert secured lengthwise along the center of said vertical cavity and extending from an upper end to the lower end thereof and having an exterior surface of revolution spaced from the circular inner edges of the heat exchange fins and forming a second airflow channel therebetween, said second airflow channel narrowing from top to bottom and communicating with said first airflow channel; a fan positioned at the top of said fin stack comprising a fan core mounted directly opposite and adjacent to the upper end of said elongated insert, and opposite said heat transfer plate, said fan configured such that the fan blades extend from the fan core whereby the fan blade area substantially coincides with the outer and inner diameter of the upper end of the cylindrical cavity for directing air along said first and second airflow channels without substantial deflection by the upper end of said elongated insert; and wherein said fan directs air through said first airflow channels via said second airflow channel for cooling said heat exchange fins and said heat pipes and/or said thermosyphon tubes.