Development of Small Size Claude Cycle Helium Refrigerator with Micro Turbo-Expander
In the field of small size helium refrigerators, need for a maintenance free and vibration free system is rapidly increasing, especially for the application to cryoelectronic devices such as NMR-CT and Josephson computers. To meet this need, we have been developing a Claude cycle helium refrigerator (5W at 4.5K) with two-stage expansion micro-turbines. Other than the micro-turbines, compact size perforated- plate heat exchangers and a single-stage screw type compressor have been developed for the system. This paper describes design and test results of the major components of the system with an emphasis on the micro-turbine performance.
Unable to display preview. Download preview PDF.
- 1.D. B. Colyer, Miniature cryogenic refrigerator turbo-alternators, in: “Advances in Cryogenic Engineering, Vol. 14,” Plenum Press, New York (1969), p, 405.Google Scholar
- 2.N. Tsumaki, et al, Experimental investigation on a floating bush gas bearing, in “Proc. of JSLE Intl. Tribology Conf.,” JSLE, Tokyo (1985), p. 779.Google Scholar
- 3.S. Harada, et al, Heat transfer performance of perforated-plate heat exchanger, in: “Proc. of 31st Meeting of Cryo. Assoc. of Japan,” Cryo. Assoc. of Japan, Tokyo (1984), p. 46.Google Scholar
- 4.N. Arai, et al. Scroll and screw compressors: the latest compressor technology for air conditioning and refrigeration, Hitachi Review, 34: 6 (1985).Google Scholar