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Rare-earth regenerator material particles, and group of rare-earth regenerator material particles, refrigerator and measuring apparatus using the same, and method for manufacturing the same

  • US 10,024,583 B2
  • Filed: 06/28/2017
  • Issued: 07/17/2018
  • Est. Priority Date: 08/25/2009
  • Status: Active Grant
First Claim
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1. A method of manufacturing a refrigerator for accumulating an extremely low temperature cold, comprising the steps of:

  • providing a vacuum chamber;

    providing an external cylinder so as to be disposed in the vacuum chamber, the external cylinder enclosing an inner space;

    providing at least one regenerator container for accumulating cold which is arranged at the inner space inside of the external cylinder;

    installing a seal ring between the external cylinder and the regenerator container;

    forming an expanding chamber between the external cylinder and the regenerator container;

    combining a compressor for compressing a cooling medium gas; and

    packing a group of regenerator material particles in the regenerator container;

    wherein the group of regenerator material particles have an average particle size of 0.045 to 3 mm,wherein a proportion of particles having a ratio of a long diameter to a short diameter of 2 or less is 90% or more by number, a proportion of particles having a depressed portion having a length of 1/10 to ½

    of a particle circumferential length of a particle on a particle surface is 30% or more by number and wherein the depressed portion has depth of 1/10 or less of a particle diameter.

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