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
First Claim
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1. A Gifford MacMahon type (GM) refrigerator for accumulating an extremely low temperature cold, comprising:
- a vacuum chamber;
an external cylinder provided so as to be disposed in the vacuum chamber, the external cylinder enclosing an inner space;
at least one regenerator container for accumulating cold which is arranged at the inner space inside the external cylinder;
a seal ring installed between the external cylinder and the regenerator container;
an expanding chamber formed between the external cylinder and the regenerator container;
a compressor for compressing a cooling medium gas; and
a group of regenerator material particles packed 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 a depth of 1/10 or less of a particle diameter.
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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
24 Claims
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1. A Gifford MacMahon type (GM) refrigerator for accumulating an extremely low temperature cold, comprising:
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a vacuum chamber; an external cylinder provided so as to be disposed in the vacuum chamber, the external cylinder enclosing an inner space; at least one regenerator container for accumulating cold which is arranged at the inner space inside the external cylinder; a seal ring installed between the external cylinder and the regenerator container; an expanding chamber formed between the external cylinder and the regenerator container; a compressor for compressing a cooling medium gas; and a group of regenerator material particles packed 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 a depth of 1/10 or less of a particle diameter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A pulse tube refrigerator comprising:
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at least one regenerator unit; and a group of regenerator material particles packed in the at least one regenerator unit, 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 a depth of 1/10 or less of a particle diameter. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24)
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Specification