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
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Abstract
Provided is a group of rare-earth regenerator material particles having an average particle size of 0.01 to 3 mm, wherein the proportion of particles having a ratio of a long diameter to a short diameter of 2 or less is 90% or more by number, and the proportion of particles having a depressed portion having a length of 1/10 to ½ of a circumferential length on a particle surface is 30% or more by number. By forming the depressed portion on the surface of the regenerator material particles, it is possible to increase permeability of an operating medium gas and a contact surface area with the operating medium gas.
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Citations
44 Claims
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1-17. -17. (canceled)
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18. A method of manufacturing a Gifford MacMahon type (GM) refrigerator for accumulating an extremely low temperature cold, comprising:
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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. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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34. A method of manufacturing a pulse tube refrigerator for accumulating an extremely low temperature cold, comprising:
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providing at least one regenerator unit; 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, andwherein the depressed portion has a depth of 1/10 or less of a particle diameter. - View Dependent Claims (35, 36, 37, 38, 39, 40, 41, 42, 43, 44)
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Specification