Refrigeration – Using electrical or magnetic effect
Patent
1991-11-05
1992-10-20
Cohan, Alan
Refrigeration
Using electrical or magnetic effect
505891, F25B 2102
Patent
active
051560038
ABSTRACT:
A magnetic refrigerator comprising a magnet generating a high-intensity magnetic field, a tube-shaped superconducting magnetic shield, a magnetic working material and a reciprocating means for reciprocatively moving the superconducting magnetic shield or the magnetic working material, the magnetic refrigerator being arranged such that a magnetization process wherein the magnetic working material is magnetized in the high-intensity magnetic field and a demagnetization process wherein the magnetic working material is demagnetized by being accommodated in the hollow section of the magnetic shield are repeated by the reciprocating means so that the magnetic working material generates coldness.
By using the property of a tube-shaped superconductor which can shield the magnetism of an external magnetic field passing through the hollow section of the tube and can generate a zero-intensity magnetic field in the hollow section, the magnetic working material magnetized in the high-intensity magnetic field generated by the magnet is inserted into the hollow section of the tube-shaped superconducting shield and is demagnetized in an adiabatic condition to generate coldness. This coldness is used to cool the target cold bath.
REFERENCES:
patent: 4107935 (1978-08-01), Steyert
patent: 4332135 (1982-06-01), Barclay
patent: 4464903 (1984-08-01), Nakagome
patent: 4509334 (1985-04-01), Nakagome
patent: 4532770 (1985-08-01), Hakuraku
Inoue Masaru
Otani Kohei
Sato Manabu
Sugioka Takao
Takagi Tetsuo
Cohan Alan
Koatsu Gas Kogyo Co. Ltd.
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