New Type Screw Compressor for Helium Refrigerators and Liquefiers
With the development of large-scale refrigerators and liquefiers, turbine expanders are replacing reciprocating expanders and at the same time their reliability has improved significantly . As for compressors, though, reliability problems still remain. At present, large refrigerators and liquefiers rely mainly on reciprocating compressors , although inherent problems, like noise, vibration, overheating, wear, etc., still need additional research. In view of these difficulties with the reciprocating type of compressors, development has begun on a screw-type compressor for helium refrigerators and liquefiers; a similar project is under way at British Oxygen . The screw compressor, developed first by Swedish Svenska Rotor Maskiner in the early thirties, was an oil-free type unit. In 1958, it was modified into an oil injection type  and is now widely used for Freon refrigerators.
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