Natural convection heat transfer type room-temperature magnetic Refrigerator

Abstract

The invention discloses a natural convective recuperative room-temperature magnetic refrigerating device, which is characterized by the following: adapting gadolinium piece group as working substance and neodymium-iron-borax permanent magnet as magnetizing field; placing sheet working substance in the cold-storage liquid to keep still; rotating the magnet to magnetize and demagnetize the working substance gadolinium reciprocally; adapting the magnetothermal effect to refrigerate the working substance. The invention prevents the working substance and case from relative movement, which improves the refrigerating efficiency.

Description

1. Technical field [0001] The invention relates to the technical field of refrigeration, in particular to the technical field of magnetic refrigeration 2. Background technology [0002] The application of magnetic refrigeration in the deep and low temperature range has been more than 70 years ago. As early as 1933 (Phys.Rew.43: 768, 1933), the magnetic refrigeration effect was used to obtain ultra-low temperatures below 1K, and the lowest temperature reached 10 -8 K. However, in the high temperature range, especially in the room temperature range, the research and development of magnetic refrigeration technology is progressing slowly. It was not until 1976 that G.V.Brown (J.Appl.Phys.47:3673, 1976) made a pioneering work on room temperature magnetic refrigeration, proving the possibility of room temperature magnetic refrigeration for the first time. G.V. Brown's device is a reciprocating device. Thereafter, W.A.Steyert and J.A.Barclay (J.Appl.Phys, 47:8, 1976) proposed a...

AI Technical Summary

Problems solved by technology

For example, some devices (CEC 1987; Adv.Cryo.Eng.41: 1759, 1998; U.S. Patent: 5934078) have obvious mechanical friction in the low temperature area, which leads to a great reduction in refrigeration efficiency

Some devices have unreasonable working fluid structure (J.Appl.Phys.47:3673, 1976), and the distance between the gadolinium sheets of the working fluid group is guaranteed by filling the wire mesh, so the movement resistance is very large, causing the cold storage fluid to mix. , affecting temperature span, power, etc.

However, some devices (U.S. Patent: 5934078; U.S. Patent: 6526759B2; U.S. Patent: 2003 / 0106323A1) have complex structures and control systems, making it more difficult to manufacture

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