A METHOD FOR REALIZING MAGNETIZATION AND DEMAGNETIZATION OF THE MAGNETIC REFRIGERATING WORKING SUBSTANCE, UTILIZING DYNAMIC MAGNETIC CIRCUIT

摘要

A method is used for realizing magnetization and demagnetization of the magnetic refrigerating working substance in room-temperature magnetic refrigeration system, which utilizes dynamic magnetic circuit. The magnitude of the magnetic field in the working space of the magnetic refrigerating working substance is controlled by said dynamic magnetic circuit through varying the magnetic field direction of permanent magnet block. The magnetic refrigerating working substance is quiescent relative to the magnet. A closed magnetic circuit is constituted by multiple small magnet units which make up a closed loop. Each small magnet unit is successively mounted in terms of a definite angle after charging magnetism. A central cavity is the convergence space of the magnetic field. At least four small magnets are rotated under activation of the external force in the closed magnetic circuit. The magnetic field in the working space of the magnetic refrigerating working substance is changed periodically from intense magnetic field to weak magnetic field or no magnetic field during the variation of the magnetic field direction. The present invention can decrease the motion amplitude of the motion components, and then decrease the volume of the system. The heat exchange efficiency of the secondary refrigerant .and the cold accumulator is improved since the magnetic refrigranting working substance is provided in the central cavity.