Active magnetic regenerator for reducing demagnetization effect

Abstract

An active magnetic heat regenerator for reducing a demagnetization effect comprises a magnetocaloric assembly and a synchronous rotating assembly sleeving the magnetocaloric assembly. The magnetocaloric assembly comprises a heat regenerator shell, a plurality of magnetocaloric material plates which are accommodated and fixed in the heat regenerator shell and are arranged in parallel at intervals,and two heat regenerator ends which are fixed at the two ends of the heat regenerator shell correspondingly; and circulation channels communicating with the heat regenerator shell are arranged in theheat regenerator ends. The active magnetic heat regenerator for reducing the demagnetization effect can reduce the negative influence caused by the demagnetization effect in a current rotary magneticrefrigeration prototype and reduce the magnetic torque borne by plate stack materials.

Description

technical field [0001] The application relates to the field of magnetic refrigeration, in particular to an active magnetic regenerator that reduces the demagnetization effect. Background technique [0002] Magnetic refrigeration is a new type of refrigeration technology based on the magnetocaloric effect, using solid-state refrigeration, and featuring clean and environmentally friendly features. The magnetic refrigerator is mainly composed of a magnetic field system, an active magnetic regenerator, and a heat exchange system. The active magnetic regenerator consists of three parts: magnetic caloric material, regenerator shell and heat exchange flow channel, which is the core of the magnetic refrigerator. The active magnetic regenerator is to fill the shell of the regenerator with magnetocaloric material, use water and other heat transfer medium to flow in the heat exchange channel formed by the gap between the magnetocaloric material, and realize the heat exchange between t...

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Problems solved by technology

Therefore, during the working process, the direction of the magnetic field strength applied to the magnetocaloric material plate stack changes all the time, and it cannot be guaranteed to always follow the direction of the minimum demagnetization field, which leads to a decrease in the actual magnetic field strength acting on the magnetocaloric material, thereby weakening the Its magnetocaloric effect reduces its cooling capacity

In addition, due to the changing direction of the magnetic field, the magnetocaloric material will also be affected by the magnetic torque, and the rare earth-based materials widely used at present have the characteristics of high brittleness and are prone to fatigue damage, which affects the service life and reliability of the magnetic refrigeration system.

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