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Magnetic material for magnetic refrigeration apparatus, amr bed, and magnetic refrigeration apparatus

a technology of magnetic refrigeration and amr bed, which is applied in the direction of lighting and heating apparatus, machine operation mode, magnetic body, etc., can solve the problems of reducing working efficiency, affecting the environment, and cfc's substitutes also have adverse effects on the environment, so as to improve the efficiency of magnetic refrigeration and widen the effect of operation

Inactive Publication Date: 2009-09-03
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a magnetic material for a magnetic refrigeration apparatus that uses a liquid refrigerant. The magnetic material includes at least two kinds of magnetic particles with different magnetic transition temperatures that are blended together and exhibit a spherical shape with a maximum diameter of 0.3 mm or more to 2 mm or less. This magnetic material improves the efficiency of magnetic refrigeration by its wide operation temperature range. The magnetic refrigeration apparatus includes an AMR bed filled with the magnetic material, a magnetic field generation device for applying and removing a magnetic field, a cooling block, a radiating block, and a refrigerant flow path connected to the AMR bed, the cooling block, and the radiating block. The apparatus uses the magnetic material to circulate the liquid refrigerant and achieve efficient magnetic refrigeration.

Problems solved by technology

However, as to the gas compression / expansion cycle, a serious problem of environmental destruction is caused by specific freon gases discharged into the environment, and CFC's substitutes also have a problem of an adverse affect to the environment.
As a result, a refrigeration work is carried out by generating a large temperature difference.
Incidentally, since the magnetocaloric effect of the magnetic refrigeration material can obtain a large effect only in the vicinity of a magnetic transition temperature, a problem arises in that the working efficiency is lowered when temperature is shifted from the magnetic transition temperature of the material.

Method used

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  • Magnetic material for magnetic refrigeration apparatus, amr bed, and magnetic refrigeration apparatus
  • Magnetic material for magnetic refrigeration apparatus, amr bed, and magnetic refrigeration apparatus
  • Magnetic material for magnetic refrigeration apparatus, amr bed, and magnetic refrigeration apparatus

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first embodiment

[0026]A magnetic material for a magnetic refrigeration apparatus of a first embodiment is a magnetic material for a magnetic refrigeration apparatus using a liquid refrigerant. At least two kinds of magnetic particles having different magnetic transition temperatures (Tc) are approximately uniformly blended. The magnetic particles exhibit an approximately spherical shape with a maximum diameter of 0.3 mm or more to 2 mm or less.

[0027]In the magnetic material of the first embodiment, two kinds of magnetic particles, for example, Gd particles having a magnetic transition temperature 293 (K) and Gd95Y5 particles having a magnetic transition temperature 283 (K), which is lower than that of the Gd particles, are approximately uniformly blended at a ratio of 1:1. Hereinafter, the difference between the magnetic transition temperatures of the two kinds of the magnetic particles is called a magnetic transition temperature difference (ΔTc).

[0028]The two kinds of the magnetic particles exhibi...

second embodiment

[0038]A magnetic refrigeration apparatus of a second embodiment is a magnetic refrigeration apparatus using a liquid refrigerant. The magnetic refrigeration apparatus has AMR bed filled with a magnetic material, a magnetic field generation means (device) for applying and removing a magnetic field to and from the magnetic material, a cooling block, and a radiating block. Further, the magnetic refrigeration apparatus has a refrigerant flow path formed by connecting the AMR bed, the cooling block and the radiating block configured to circulate the liquid refrigerant. The magnetic material with which the AMR bed is filled is formed by approximately uniformly bending at least two kinds of magnetic particles having different magnetic transition temperatures, and the magnetic particles has a feature in that they exhibit an approximately spherical shape with a maximum diameter of 0.3 mm or more to 2 mm or less. Note that since the magnetic material with which the AMR bed is filled is the sa...

example 1

[0056]AMR bed (hereinafter, called also a specimen vessel) was filled with a specimen, in which Gd95Y5 particles and Gd particles formed in a spherical shape and having a diameter of 0.3 mm or more to 2 mm or less were blended at a weight ratio of 3:1 (Gd ratio=25%), at a void ratio of 30% to 50%, and a refrigeration temperature difference (ΔT) was evaluated. Note that the magnetic transition temperature of the Gd95Y5 particles was 283 K, the magnetic transition temperature of the Gd particles was 293 K, and a magnetic transition temperature difference (ΔTc) was 10 K. The refrigeration temperature difference (ΔT) was evaluated by the following method.

[0057]The AMR bed was filled with the specimen so that the specimen did not easily move. Next, a thermocouple was inserted into the specimen vessel through a 0.8 mm φ hole formed to an upper lid of the vessel so that it was positioned in a central portion of the specimen vessel. Further, the specimen vessel was entirely covered with a h...

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Abstract

There are provided a magnetic material for a magnetic refrigeration apparatus, which improves magnetic refrigeration efficiency by the wide operation temperature range of it, AMR bed using the magnetic material, and a magnetic refrigeration apparatus. The magnetic material is used for the magnetic refrigeration apparatus using a liquid refrigerant, formed by approximately uniformly blending at least two kinds of magnetic particles having different magnetic transition temperatures, and the magnetic particles exhibit an approximately spherical shape with maximum diameter of 0.3 mm or more to 2 mm or less. The AMR bed is filled with the magnetic particles.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application is based upon and claims the benefit of priority from Japanese Patent Applications No. 2008-047663, filed on Feb. 28, 2008, the entire contents of which are incorporated herein by reference.FIELD OF THE INVENTION[0002]The present invention relates to a magnetic material having a magnetocaloric effect and used for a magnetic refrigeration apparatus, AMR bed using the magnetic material, and the magnetic refrigeration apparatus.BACKGROUND OF THE INVENTION[0003]At present, a refrigeration technology in a room temperature region which closely relates to a human daily life, for example, a refrigerator, a freezer, a room air conditioner, and the like, almost employs a gas compression / expansion cycle. However, as to the gas compression / expansion cycle, a serious problem of environmental destruction is caused by specific freon gases discharged into the environment, and CFC's substitutes also have a problem of an adverse affect to t...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F25B21/00
CPCF25B21/00Y02B30/66H01F1/015F25B2321/0021Y02B30/00
Inventor KAJI, SHIORISAITO, AKIKOKOBAYASHI, TADAHIKO
Owner KK TOSHIBA
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