Refrigeration – Gas compression – heat regeneration and expansion – e.g.,...
Reexamination Certificate
2006-11-07
2006-11-07
Esquivel, Denise L. (Department: 3744)
Refrigeration
Gas compression, heat regeneration and expansion, e.g.,...
Reexamination Certificate
active
07131276
ABSTRACT:
The present invention relates to pulse tube refrigerators for recondensing cryogenic liquids. In particular, the present invention relates to the same for magnetic resonance imaging systems. In many cryogenic applications components, e.g. superconducting coils for magnetic resonance imaging (mri), superconducting transformers, generators, electronics, are cooled by keeping them in contact with a volume of liquified gases (e.g. helium, neon, nitrogen, argon, methane). In a first aspect, the present invention provides a pulse tube refrigerator PTR pulse tube refrigerator (PTR) arrangement within a cryogenic apparatus, wherein a regenerator tube of the PTR is finned. In this configuration the fins or baffles, are believed to increase the surface area available for distributed heat transfer from the helium atmosphere to the regenerator.
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Hughes Timothy
Pan Huaiyu
White Keith
Crowell & Moring LLP
Esquivel Denise L.
Leung Richard L.
Oxford Magnet Technologies Ltd.
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