| US 7,500,366 B2 | ||
| Refrigerator with magnetic shield | ||
| Mingyao Xu, Emmaus, Pa. (US); Jin Lin Gao, Shanghai (China); and Ralph C. Longsworth, Allentown, Pa. (US) | ||
| Assigned to SHI-APD Cryogencis, Inc., Allentown, Pa. (US); and Sumitomo Heavy Industries, Ltd., Tokyo (Japan) | ||
| Filed on Dec. 08, 2005, as Appl. No. 11/297,125. | ||
| Prior Publication US 2007/0130961 A1, Jun. 14, 2007 | ||
| Int. Cl. F25B 9/00 (2006.01); H01F 7/00 (2006.01) | ||
| U.S. Cl. 62—6 [335/301] | 19 Claims |
| 1. A regenerative type expander comprising:
a vacuum enclosure inside a gas filled outer sleeve forming a bore directly around the regenerative type expander material,
magnetic material forming the expander material in the bore
a superconducting magnetic shield, where the superconducting magnetic shield is fixed within the vacuum enclosure isolated
to reduce thermal conduction from the vacuum enclosure and where the superconducting magnetic shield surrounds the magnetic
material, and
a thermal base at one end of the outer sleeve for conducting heat from the magnetic shield.
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