Browse Prior Art Database

TCM With Multiple Side-Loaded Interlocking Pistons for Improved Thermal Resistance

IP.com Disclosure Number: IPCOM000036009D
Original Publication Date: 1989-Aug-01
Included in the Prior Art Database: 2005-Jan-28
Document File: 2 page(s) / 25K

Publishing Venue

IBM

Related People

Edwards, DL: AUTHOR [+2]

Abstract

Disclosed is a method of achieving a low internal thermal resistance in a TCM without tight tolerances by using a multiple piston conduction cooling scheme where four interlocking pistons in a common hole contact the back of the chip. The chip-to-pistons thermal resistance is low because of near 100% chip coverage, flat piston faces, and multiple contacts, preventing a single piece of contamination from disrupting the entire chip thermal interface. The interlocking design eliminates the need for piston headers, resulting in the hat being closer to the chip, thereby shortening the thermal path to the cooling water. The piston-to-hat thermal resistance is low because of side loading between pistons and because of the increased surface area inherent with multiple pistons.

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TCM With Multiple Side-Loaded Interlocking Pistons for Improved Thermal Resistance

Disclosed is a method of achieving a low internal thermal resistance in a TCM without tight tolerances by using a multiple piston conduction cooling scheme where four interlocking pistons in a common hole contact the back of the chip. The chip-to-pistons thermal resistance is low because of near 100% chip coverage, flat piston faces, and multiple contacts, preventing a single piece of contamination from disrupting the entire chip thermal interface. The interlocking design eliminates the need for piston headers, resulting in the hat being closer to the chip, thereby shortening the thermal path to the cooling water. The piston-to- hat thermal resistance is low because of side loading between pistons and because of the increased surface area inherent with multiple pistons.

The figure shows a cross-sectional view of a single chip site in which springs push on pistons in directions that are 90 degrees apart and combine to a single net force pushing the pistons away from the center of the piston cluster to contact the inside of the hold in the hat. The side loading allows looser tolerances to be used, lowering the cost, and causes the pistons to contact the inside of the hold in the hat. This contact contributes to a very low thermal resistance across the gap, and, in turn, allows the optimum length of the pistons to be shorter, contributing to an overall lower internal thermal resistanc...