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Thermal Conduction Module (TCM) Having Hollow Pistons with Internal Fins and Containing a Boiling Liquid and Having Water Passages in the Hat Around the Sides of the Cylindrical Piston Cavities

IP.com Disclosure Number: IPCOM000037691D
Original Publication Date: 1989-May-01
Included in the Prior Art Database: 2005-Jan-29
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Chrysler, GM: AUTHOR [+3]

Abstract

In a TCM, a chip enclosure is formed by a thin square chip carrier (or substrate) and a metal structure called a hat. The module will be described in the orientation in which the chip carrier is in a horizontal plane with the chip surface facing up. Heat is conducted from the chips to the hat by means of cylindrical metal pistons that are carried in downwardly open cylindrical holes in the hat. The pistons are spring loaded to contact the chip after the hat and the chip carrier are assembled.

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Thermal Conduction Module (TCM) Having Hollow Pistons with Internal Fins and Containing a Boiling Liquid and Having Water Passages in the Hat Around the Sides of the Cylindrical Piston Cavities

In a TCM, a chip enclosure is formed by a thin square chip carrier (or substrate) and a metal structure called a hat. The module will be described in the orientation in which the chip carrier is in a horizontal plane with the chip surface facing up. Heat is conducted from the chips to the hat by means of cylindrical metal pistons that are carried in downwardly open cylindrical holes in the hat. The pistons are spring loaded to contact the chip after the hat and the chip carrier are assembled.

In this module the pistons are hollow and contain a small amount of a liquid such as water at a pressure for the liquid to boil during the normal operation of the module. The piston is constructed as a hollow cylinder with disks brazed to each end. The disk nearest the chips has radial fins on its inside surface to provide an extended boiling surface. The inside walls of the cylinder have longitudinal fins to provide an enhanced condensation surface.

The hat is formed with internal water passages around the cylindrical hole for each piston. The passages extend downwardly to nearly the bottom surface of the hat and thereby bring the cooling water close to the condensing surfaces of the pistons. The cylindrical passages are interconnected with inlet and outlet headers. Preferably, as se...