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Cryogenic refrigeration system 10 employs a screw compressor 72 and a screw expander 70 wherein one rotor of the compressor and one rotor of the expander is mechanically driven, including a magnetic coupling 50, 52 between the compressor and expander rotors. The other compressor rotor and other expa

Cryogenic refrigeration system 10 employs a screw compressor 72 and a screw expander 70 wherein one rotor of the compressor and one rotor of the expander is mechanically driven, including a magnetic coupling 50, 52 between the compressor and expander rotors. The other compressor rotor and other expander rotor is driven only by the connected rotor.

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A closed cycle refrigeration system comprising: a screw compressor having a housing with a compressor chamber therein, said housing having inlet and outlet ends, an inlet and an outlet adjacent the ends of the said housing; first and second helical rotors rotatably mounted within said housing, said

A closed cycle refrigeration system comprising: a screw compressor having a housing with a compressor chamber therein, said housing having inlet and outlet ends, an inlet and an outlet adjacent the ends of the said housing; first and second helical rotors rotatably mounted within said housing, said first and second helical rotors respectively having intermeshing lobes and recesses configured and fitted so that compression occurs in oil-free refringerant gas passing through said compressor; an expander having an expander housing with an expander chamber therein, said expander housing having inlet and outlet ends, an inlet adjacent one end of said expander housing and an outlet on the outlet end of said expander housing; first and second helical expander rotors rotatably mounted within said expander housing, said first and second helical expander rotors respectively having intermeshing lobes and recesses configured and fitted so that gas expansion takes place between said lobes and within said recesses in oil-free refrigerant gas upon rotation of said expander rotors in said expander housing; means interconnecting said inlet and outlet on said compressor housing and said inlet and said outlet on said expander housing for providing a closed cycle for the circulation of oil-free refrigerant gas therein, for rejecting heat, and for receiving heat for producing refrigeration upon rotation of said rotors; and a wall between said compressor housing and said expander housing, magnetic drive means connected to rotate with one of said compressor rotors and magnetic drive means connected to rotate with one of said expander rotors for magnetically coupling said rotors to transfer power therebetween as they rotate.