Permanent magnet system for room-temperature magnetic refrigerator

Abstract

The invention discloses a permanent magnet system for a room-temperature magnetic refrigerator. The permanent magnet system comprises a permanent magnet for providing an excitation source and an E-shaped magnetic conduction framework for conducting magnetism; the whole framework is divided into upper and lower regions by a magnet core in the middle part of the magnetic conduction framework; the outer end of the magnet core is a platform structure with upper and lower protruding parts; two layers of magnetic conduction materials are respectively arranged between the upper and lower regions and the outer ends of the magnetic conduction materials are leveled to the outer end of the magnet core; a gap is reserved between the inner ends of the magnetic conduction materials and the inner wall of the framework; a working gap is formed between the magnetic conduction materials and a platform of the magnet core; and the permanent magnets with different magnetizing directions are filled into the magnetic conduction framework regions outside the working gap in a direction determined by the Halbach rotation principle. According to the permanent magnet system provided by the invention, more magnetic working mediums can be loaded so that the refrigeration amount is increased; the uniformity of the field strength of an air gap is good, the heat exchange inside the magnetic working mediums is reduced, the heat exchange efficiency is increased and the structure is more compact and efficient.

Description

technical field [0001] The invention relates to a permanent magnet system for a room temperature magnetic refrigerator. Background technique [0002] Magnetic refrigeration technology uses the magnetocaloric effect (Magnetocaloric Effect) of magnetic refrigeration materials (magnetic working medium), that is, the magnetic working medium enters the magnetic field (excitation) to release heat to the outside world, and exits the magnetic field (demagnetization) to absorb heat to the outside world. Features to achieve refrigeration. The principle is that the electronic magnetic moments are arranged in an orderly manner in the magnetic field, causing the magnetic entropy to decrease, causing the magnetic working medium to heat up; after exiting the magnetic field, the magnetic moments are arranged disorderly, and the magnetic entropy increases, and the magnetic working medium absorbs heat from the outside, and this Refrigeration can be achieved by connecting the two processes wi...

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Problems solved by technology

[0005] 1. The uniformity of the air gap field strength is not good, and there is heat exchange inside the magnetic working medium, which reduces the heat exchange efficiency

[0006] 2. The permanent magnet system with large air gap field strength has complex magnet structure, difficult processing and assembly, and high cost

[0007] 3. The force of the magnetic working medium box is asymmetrical, and it is distorted and deformed by the alternating asymmetric load, which increases the use and maintenance cost of the room temperature magnetic refrigerator

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