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
Patent Images
1. A refrigerator for accumulating an extremely low temperature cold, comprising:
- a vacuum chamber;
an external cylinder disposed in the vacuum chamber, the external cylinder enclosing an inner space;
a first regenerator container for accumulating cold and a second regenerator container for accumulating cold which are arranged at the inner space inside of the external cylinder, the first regenerator container for accumulating a first cold generated at a first cooling stage, the second regenerator container for accumulating a second cold generated by further cooling the first cold at a second cooling stage,a mesh-like member packed in the first regenerator container for accumulating cold, andregenerator material particles packed in the second regenerator container, the regenerator material particles comprising a rare-earth metal and having 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, and the depressed portion has channel-shape or a hole-shape.
0 Assignments
0 Petitions
Accused Products
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.
-
Citations
10 Claims
-
1. A refrigerator for accumulating an extremely low temperature cold, comprising:
-
a vacuum chamber; an external cylinder disposed in the vacuum chamber, the external cylinder enclosing an inner space; a first regenerator container for accumulating cold and a second regenerator container for accumulating cold which are arranged at the inner space inside of the external cylinder, the first regenerator container for accumulating a first cold generated at a first cooling stage, the second regenerator container for accumulating a second cold generated by further cooling the first cold at a second cooling stage, a mesh-like member packed in the first regenerator container for accumulating cold, and regenerator material particles packed in the second regenerator container, the regenerator material particles comprising a rare-earth metal and having 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, and the depressed portion has channel-shape or a hole-shape. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
Specification