| 摘要 |
PROBLEM TO BE SOLVED: To increase cooling performance by increasing a surface area while suppressing a volume at a low temperature end in a return type pulse tube refrigerator. SOLUTION: In the pulse tube refrigerator in which a cold accumulator 2 is connected to a pulse tube 3 through a connection tube bent in U-shape, a plurality of thin tubes 12 having a same inner diameter and a length are bound and the bound thin tubes are bent to form the connection tube 5. By binding the plurality of thin tubes 12, the large area can be secured while reducing the volume of the connection tube 5. Also, the flow resistances of the thin tubes 12 are made equal to each other by making equal the inner diameters and lengths of the plurality of thin tubes 12 to each other so that the flow velocity distribution of working gas can be uniformized in a pulse tube cross section without using a straightening body. In this case, both end faces of the bundle of the thin tubes 12 after being bent in U-shape are kept at a right angle relative to the axis thereof by twisting the bundle of the thin tubes 12 so that the connection of the cold accumulator 2 to the pulse tube 3 can be easily performed. COPYRIGHT: (C)2004,JPO&NCIPI
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