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Oil-Filled Thermal Conduction Module With Tapered Pistons And Enhanced Side Channels

IP.com Disclosure Number: IPCOM000102612D
Original Publication Date: 1990-Dec-01
Included in the Prior Art Database: 2005-Mar-17
Document File: 4 page(s) / 128K

Publishing Venue

IBM

Related People

Goth, GF: AUTHOR [+5]

Abstract

This article describes a new cooling concept using enhanced water channels between long tapered pistons to extend TCM performance up to 100 watts per 1 cm chip. While side water channels have been disclosed previously, several claims are made in this article: 1. The design and use of long offset tapered pistons. 2. The application of a piston and hat having two distinct diameters. 3. Water channels along the sides of long tapered pistons. 4. Extended surfaces located within the channels. 5. Means of increasing fin density. 6. Methods of obtaining thermal contact between the extended surfaces and the hat.

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Oil-Filled Thermal Conduction Module With Tapered Pistons And Enhanced Side Channels

       This article describes a new cooling concept using
enhanced water channels between long tapered pistons to extend TCM
performance up to 100 watts per 1 cm chip.  While side water channels
have been disclosed previously, several claims are made in this
article:
      1.  The design and use of long offset tapered pistons.
      2.  The application of a piston and hat having two distinct
diameters.
      3.  Water channels along the sides of long tapered pistons.
      4.  Extended surfaces located within the channels.
      5.  Means of increasing fin density.
      6.  Methods of obtaining thermal contact between the extended
          surfaces and the hat.

      The presence of chip tilt makes tapering the piston mandatory
for high performance.  Without a taper, the diameter of the piston
must be decreased significantly for long pistons.  The effect is to
increase the gap between piston and hat, increasing the total thermal
resistance. Conversely, a tapered piston can have added length
without effecting the gap along the original length.  Hence, the
radial oil film gap resistance continually is reduced as a tapered
piston length is increased.  Thus, tall convective side channels are
more effective with dual-tapered pistons, and the effect of fouling
is reduced.

      Fig. 1 shows a side view of a single chip site having a piston
that has a tapered upper portion, a cylindrical middle section, and a
larger diameter cylindrical lower portion.  The end surface of the
large diameter portion provides chip contact, whereas the perimeter
surface provides a low resistance path for heat removal from the chip
edges to the hat.  Also shown are conventional side water channels.
The channels are machined across the entire module length and are
manifold together at each end.  The manifold design can provide
parallel water flow to each channel or, alternatively, multiple
passes of water flow.

      As illustrated in Fig. 1, the side channels are enhanced with
extended surfaces made by folding and stamping sheet m...