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A Heat Sink with Integrated Fans

IP.com Disclosure Number: IPCOM000107251D
Original Publication Date: 1992-Jan-01
Included in the Prior Art Database: 2005-Mar-21
Document File: 1 page(s) / 68K

Publishing Venue

IBM

Related People

Johnson, GW: AUTHOR [+2]

Abstract

Disclosed is the structure of a heat sink integrated with a fan. The reason for integrating the heat sink and the fan is to maximize the flow of air and eliminate ducting over those modules which require the greatest cooling. Simply designing the heat sink large enough to provide sufficient passive heat dissipation for high-powered modules can lead to unrealistically large heat sinks.

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A Heat Sink with Integrated Fans

      Disclosed is the structure of a heat sink integrated with a
fan.  The reason for integrating the heat sink and the fan is to
maximize the flow of air and eliminate ducting over those modules
which require the greatest cooling. Simply designing the heat sink
large enough to provide sufficient passive heat dissipation for
high-powered modules can lead to unrealistically large heat sinks.

      A cut-away view of the heat sink is shown in the figure.  An
axial fan 11 is mounted next to a heat sink 13 consisting of many
separated parallel thin plates, herein referred to as fins. These
fins are constructed of sheet metal, often bent to a particular
shape, but may also be constructed by some other means such as by
moulding or by NC machining from solid stock. In any case, the fins
are attached to, or part of, a base through which heat is conducted
away from heat generating elements (such as integrated circuits) that
are in intimate thermal contact with the opposite side (from the
fins) of the base. Straight fins are preferred since they have the
lowest pressure drop, but other fin designs may also be applicable.
A duct-like clip 12 covers the fan and the heat sink. It is used for
confining the air flow and for mechanical support. For simplicity,
the details of the mounting hardware are deleted in the figure. There
is an air pressure equalization zone 14 between the fan 11 and the
fins of the heat sink 13. This zone is created by p...