Cryogenic temperature cool storage device and refrigerator

Abstract

The refrigeration performance in a range from 3 to 10 K can be improved in comparison with conventional metal based magnetic regenerator materials. The refrigerator is provided with a regenerator utilizing at least one magnetic material including a rare earth element and sulfur as the regenerator material.

Description

technical field [0001] The present invention relates to extremely low temperature regenerators and freezers (also known as refrigerators), in particular to GM (Gifford-McMahon) cycle freezers, Stirling cycle freezers, pulse Tube freezer, Vuilleumier cycle freezer, Solvay cycle freezer, Ericsson cycle freezer, or very low temperature storage with improved freezing capacity using appropriate new storage materials Refrigerators and refrigerators, refrigeration systems using them, refrigerant generating devices, recondensing devices, superconducting magnet devices, superconducting element cooling devices, cryogenic panels, cryogenic heat shields, cooling devices in the field of space technology, etc. Background technique [0002] In conventional cold storage type ultra-low temperature refrigerators, Er 3 Ni and HoCu 2 Metal-based magnetic cold storage materials, etc., realize freezing at a temperature of 10K or below (Japanese Patent Laid-Open No. 5-71816). [0003] However, ...

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Problems solved by technology

[0003] However, these metal-based magnetic regenerator materials, such as figure 1 HoCu shown 2 As in the case of the example, the specific heat around 4.2K ~ 7K is not large enough, so the freezing capacity around 4.2K is not sufficient

Moreover, these metal-based magnetic regenerator materials have problems such as high manufacturing cost and not cheap

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