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.
KeywordsScrew Compressor Volumetric Efficiency Union Carbide Corporation Reciprocating Compressor Helium Refrigerator
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