Active magnetic regenerator and magnetic refrigeration system

Abstract

The invention discloses an active magnetic regenerator and a magnetic refrigeration system. The active magnetic regenerator comprises a shell, a rotating mechanism and a magneto-thermal unit, wherein the rotating mechanism and the magneto-thermal unit are arranged in the shell; the rotating mechanism comprises a rotating part and a fixed support, and the fixed support is arranged on the inner wall of the shell through the rotating part; and the magneto-thermal unit comprises a plurality of plate-shaped magneto-thermal materials which are arranged in parallel, and the magneto-thermal units are arranged on the fixed support. According to the active magnetic regenerator, the magneto-thermal unit is arranged inside the shell through the rotating mechanism, when the direction of an external magnetic field changes, the magneto-thermal unit synchronously rotates with the external magnetic field under the action of magnetic torque so that the direction of the external magnetic field can be always kept in the direction with the smallest demagnetization factor of the magneto-thermal materials, magnetic fields in the magneto-thermal materials are ensured to be maximized, the magneto-thermal effect of the magneto-thermal materials is fully exerted, and the optimal refrigerating performance is obtained. Meanwhile, under the action of the magnetic torque, the magneto-thermal unit rotates, so that large alternating stress is avoided inside the magneto-thermal materials, and the service life of the whole regenerator is prolonged.

Description

technical field [0001] The invention belongs to the technical field of magnetic refrigeration, and in particular relates to an active magnetic regenerator and a magnetic refrigeration system. Background technique [0002] The current mainstream refrigeration technology - vapor compression refrigeration, using CFCs, HCFCs, etc. as refrigerants, faces two environmental problems: the destruction of the ozone layer and the greenhouse effect. Magnetic refrigeration technology utilizes the magnetocaloric effect of magnetocaloric materials for refrigeration, that is, when the external magnetic field increases and the magnetocaloric material is excited, the magnetic entropy decreases, the temperature rises, and heat is released to the outside through the heat exchange fluid; when the external magnetic field decreases , when the magnetocaloric material is demagnetized, the magnetic entropy increases, the temperature decreases, and then absorbs heat from the outside through the heat t...

AI Technical Summary

Problems solved by technology

Since the current magnetocaloric materials in room temperature magnetic refrigerators are mainly rare earth-based compounds, and these materials are generally characterized by low strength and high brittleness.

Therefore, under the repeated action of the above-mentioned magnetic torque, the material is prone to fatigue damage, which greatly reduces the service life

Images