80K Turbo Compressor System Without LN2 Cooling for High Reliable and Efficient Helium Refrigerator

  • H. Asakura
  • N. Saji
  • Y. Kaneko
  • S. Yoshinaga
  • M. Mori
  • H. Yamaguchi
  • T. Nogaku
  • T. Umeda
Part of the Advances in Cryogenic Engineering book series (ACRE, volume 43)

Abstract

In Japan’s national project ‘Super-GM,’ we developed a complete oil-free 80K turbo compressor system for the helium refrigerator which brought a remarkable reliability. This compressor has a good efficiency; nevertheless, the refrigeration system efficiency is almost same as that of a conventional refrigerator because of LN2 cooling. Then we are now developing a new conceptional cold compressor without LN2 cooling. The new compressor is driven by a coaxial expansion turbine instead of an electric motor, and the intercooling between compression stages is acted by cold helium gas which is produced by the expansion of a driving turbine. In order to make matching between compressor input and turbine output, an electric generator is provided coaxially. The efficiency of system with the new compressor is expected to improve very well. The study of system arrangement and the design of the cold compressor are reported in this paper.

Keywords

Centrifugal Compressor Refrigeration System Magnetic Bearing Cold Compressor Brayton Cycle 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    H. Asakura, D. Kato, N. Saji, and H. Ohya, 80K Centrifugal Compressor for Helium Refrigeration System, in: “Advances in Cryogenic Engineering,” Vol.37B, Plenum Press, New York (1992), P.787Google Scholar
  2. 2.
    H. Asakura, D. Kato, N. Saji, H. Ohya, M. Kubota, Y. Kaneko, S. Nagai, and R. Toyama, Performance Test Results of 80K Centrifugal Compressor for Helium Refrigerator, in: “Advances in Cryogenic Engineering,” Vol.39A, Plenum Press, New York (1994), P.893CrossRefGoogle Scholar
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    H. Asakura, N. Saji, Y. Kaneko, S. Yoshinaga, M. Mori, J. Sato, A. Miyake, T. Iwasaki, I. Nishimura, T. Hosoya, and T. Umeda, Performance Analysis of Multistage 80K Centrifugal Compressors for Helium Refrigerator, Proceedings of ICEC16, P.203 (1997)Google Scholar
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    N. Saji, S. Nagai, H. Asakura, Y. Kaneko, Design of Oilfree All Turbo-type Helium Refrigerator, Cryogenics 34 ICEC Supplement, P. 115 (1994)CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media New York 1998

Authors and Affiliations

  • H. Asakura
    • 1
  • N. Saji
    • 1
  • Y. Kaneko
    • 1
  • S. Yoshinaga
    • 1
  • M. Mori
    • 1
  • H. Yamaguchi
    • 1
  • T. Nogaku
    • 1
  • T. Umeda
    • 2
  1. 1.General Machinery Div.Ishikawajima-Harima Heavy Industries Co., Ltd.Koto-ku Tokyo 135Japan
  2. 2.Super-GMKita-ku Osaka 530Japan

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