Design and Fabrication of a Rhombic Drive Stirling Cycle Cryogenic Refrigerator.

摘要

The purpose of this program was to develop a quiet, vibration-free long-life, lightweight Stirling cycle refrigerator capable of producing 1 W of cold at 77K while in a still air environment at 125F. The total power consumption of the machine was restricted to 42 W. To attain high efficiency, a double-expansion regenerator with a titanium alloy shell was used along with a titanium cold finger with copper cap. The balanced Philips rhombic drive provided the necessary drive motion without causing unwanted vibration. Brushless dc motors and dry lubrication throughout the refrigerator insured that contamination was minimized. A major acoustical study and design resulted in a variety of sound isolation techniques being applied. The refrigerator weighs 8 lbs. 7 oz., measures 5-7/8 inch x 5-5/16 inch x 9-1/4 inch and is inaudible at 63 ft. against a 40 dbA background.