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Heat Sink with Radically-Extending Fins for Fan-Sink Application

IP.com Disclosure Number: IPCOM000113930D
Original Publication Date: 1994-Oct-01
Included in the Prior Art Database: 2005-Mar-27
Document File: 2 page(s) / 85K

Publishing Venue

IBM

Related People

Kamath, V: AUTHOR [+2]

Abstract

Described are several heat sinks with radially-extending fins, which are particularly efficient within spot coolers for high-power microprocessor chips and for various multi-chip packages. In the spot coolers, the heat-sinks are exposed to airflow from a direction perpendicular to the chip surface being cooled.

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Heat Sink with Radically-Extending Fins for Fan-Sink Application

      Described are several heat sinks with radially-extending fins,
which are particularly efficient within spot coolers for high-power
microprocessor chips and for various multi-chip packages.  In the
spot coolers, the heat-sinks are exposed to airflow from a direction
perpendicular to the chip surface being cooled.

      A fan-sink is used as a spot cooler to provide dedicated
cooling for a high-power single-chip or multi-chip package in a
personal computer, when the main cooling system does not provide a
sufficient flow of cooling air over the high-power components.  This
condition often becomes a problem because acoustic constraints on the
system limit the general airflow which can be achieved.  In such an
application, the fan-sink provides localized high air velocities to
cool the high power components.  In the fan-sink assembly, a fan
smaller than the heat sink is directly mounted over the heat sink to
blow air over the heat sink.  Currently, heat sinks for fan-sink
arrangements are provided with parallel straight fins or with pin
fins.

      Fig. 1 is a plan view of a heat sink 10, having a number of
fins 12, extending radially outward from a solid hub 14 above a
circular base 16.

      Fig. 2 is a cross-sectional elevation of heat sink 10, taken in
the direction indicated by section lines II-II in Fig. 1, showing in
addition a small axial flow fan 18 driven by a DC motor, the
electronic package 20 to be cooled, and a portion of the circuit
board 22 on which package 20 is mounted.  Mechanical fastening means,
such as a clip (not shown) are provided to attach f...