Magnetic refrigerator
First Claim
1. 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, whereby a magnetization process wherein said magnetic working material is magnetized in the high-intensity magnetic field and a demagnetization process wherein said magnetic working material is demagnetized by being accommodated in the hollow section of said magnetic shield are repeated by said reciprocating means so that said magnetic working material generates coldness.
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Accused Products
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.
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Citations
17 Claims
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1. 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, whereby a magnetization process wherein said magnetic working material is magnetized in the high-intensity magnetic field and a demagnetization process wherein said magnetic working material is demagnetized by being accommodated in the hollow section of said magnetic shield are repeated by said reciprocating means so that said magnetic working material generates coldness.
- 2. A static magnetic refrigerator comprising a magnet generating a high-intensity magnetic field, a magnetic working material fixed in the high-intensity magnetic field, a tube-shaped superconducting magnetic shield having a hollow section capable of accommodating the magnetic working material and a reciprocating means for reciprocatively moving the superconducting magnetic shield, whereby a magnetization process wherein the magnetic working material is magnetized in the high-intensity magnetic field by being extracted from the hollow section of said superconducting magnetic shield and a demagnetization process wherein said magnetic working material is demagnetized in the almost-zero-intensity magnetic field in the hollow section of said superconducting magnetic shield by being accommodated in the hollow section of said shield are repeated by said reciprocating means so that said magnetic working material generates coldness.
- 3. A static magnetic refrigerator comprising a superconducting coil for generating a high-intensity magnetic field and a magnetic working material disposed in the hollow section of the superconducting coil, wherein a tube-shaped superconducting magnetic shield is disposed in the hollow section of said superconducting coil so that said shield can reciprocate inside the range between both the opening ends of the hollow section of said superconducting coil and so that the hollow section of said superconducting magnetic shield can accommodate said magnetic working material, whereby a demagnetization process wherein said magnetic working material is demagnetized by being accommodated in the hollow section of said superconducting magnetic shield and a magnetization process wherein said magnetic working material is magnetized be being extracted from the hollow section are repeated by reciprocating said superconducting magnetic shield using a reciprocating means.
- 12. An unstatic magnetic refrigerator comprising a magnet generating a high-intensity magnetic field, a tube-shaped superconducting magnetic shield having a hollow section fixed close to the magnet, a magnetic working material movable to be accommodated into the hollow section and a reciprocating means for reciprocatively moving the magnetic working material, said magnetic refrigerator is adapted such that a magnetization process wherein the magnetic working material is magnetized in the high-intensity magnetic field by being extracted from the hollow section of said superconducting magnetic shield and a demagnetization process wherein said magnetic working material is demagnetized in the almost-zero-intensity magnetic field in the hollow section of said superconducting magnetic shield by being accommodated in the hollow section of said magnetic shield are repeated by said reciprocating means so that said magnetic working material generates coldness.
Specification