초록 ▼

A two-stage pulse tube refrigerator comprises a pressure wave generator-compressor, first stage and second stage regenerators, first stage and second stage pulse tubes, heat exchangers and a hybrid phase shift mechanism for the first and second stage pulse tubes. The second stage phase shift mechani

A two-stage pulse tube refrigerator comprises a pressure wave generator-compressor, first stage and second stage regenerators, first stage and second stage pulse tubes, heat exchangers and a hybrid phase shift mechanism for the first and second stage pulse tubes. The second stage phase shift mechanism includes double fixed orifices while the first stage shifter is an arrangement including one of a) 4 valves, b) 5 valves c) 2 active buffers or d) 3 active buffers. The double fixed orifice phase shifter is located either at room temperature or is thermally connected with the first stage cold end. Two-stage pulse tube refrigerators with a hybrid phase shifter have increased second stage regenerator performance at lower temperature. Pressure drop through the valves and compressor power consumption are decreased, and losses from phase interaction between each stage are eliminated.

대표청구항 ▼

[ What is claimed is:] [1.]1. A two-stage pulse tube refrigerator for use in a cryogenic refrigeration system, comprising:a first-stage regenerator having a warm end and a cold end;a second-stage regenerator having a warm end and a cold end, said warm end of such second-stage regenerator connecting

[ What is claimed is:] [1.]1. A two-stage pulse tube refrigerator for use in a cryogenic refrigeration system, comprising:a first-stage regenerator having a warm end and a cold end;a second-stage regenerator having a warm end and a cold end, said warm end of such second-stage regenerator connecting to said cold end of said first-stage regenerator;a first-stage pulse tube having a warm end and a cold end, said cold end of said first-stage pulse tube being connected to said cold end of said first-stage regenerator;a second-stage pulse tube having a warm end and a cold end, said cold end of said second-stage pulse tube being connected to said cold end of said second-stage regenerator;a first phase controller including on/off valves and connected to said first-stage pulse tube warm end;a second phase controller including a fixed orifice and connected to said second-stage pulse tube warm end;connections for joining said warm end of said first-stage regenerator and said on/off valves to a refrigerant gas compressor.