Magnetic refrigeration working medium bed and preparation method

A technology of magnetic refrigeration and working medium bed, which is applied in the fields of magnetic refrigeration working medium bed and its preparation, magnetic refrigeration working medium bed and its preparation, and can solve the problems of large longitudinal heat leakage, decreased heat transfer specific surface area of ​​magnetic refrigeration working medium bed, and poor It is possible to realize cooling temperature span and other issues

Active Publication Date: 2012-05-23
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these material systems have a common problem: after many cycles of magnetic refrigeration, the magnetic refrigerant that has been made into a certain shape will be severely pulverized, and the stronger the first-order phase transition, the more serious the pulverization
The disadvantage of this method is: on the one hand, due to the limitation of the material properties of a single material, on the other hand, the heat transfer specific surface area of ​​the magnetic refrigerant bed is greatly reduced and the longitudinal heat leakage is large, which will reduce the efficiency of the magnetic refrigerator. And it is impossible to achieve a practical refrigeration temperature span, and this method is not suitable for other difficult-to-form magnetic refrigeration material systems

Method used

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  • Magnetic refrigeration working medium bed and preparation method
  • Magnetic refrigeration working medium bed and preparation method
  • Magnetic refrigeration working medium bed and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Example 1: The preparation of the present invention is used to realize the active magnetic regenerating magnetic refrigeration working medium bed with an ambient temperature of 30°C and a refrigeration temperature of 25°C.

[0038] 1) Preparation of magnetic refrigeration powder materials:

[0039] Preparation of La(FeSi) with a Curie point temperature of 27.5°C 13 h 1.5 Magnetic refrigeration powder materials;

[0040] 2) Preparation of sheet magnetic refrigerant bed components:

[0041] La(FeSi) 13 h 1.5 The magnetic refrigeration powder material is evenly immersed in the phenolic bonding colloid to obtain the La(FeSi)-containing 13 h 1.5 A mixture of magnetic refrigeration powder material and phenolic bonding colloid, the content of the phenolic bonding colloid accounts for 10%wt of the mixture weight; then the mixture is packed into a mold and compacted into a flat surface with a thickness of 0.5mm Straight flakes 1 (such as Figure 2a shown) and flat waves ...

Embodiment 2

[0043] Example 2: The preparation of the present invention is used to realize the active magnetic regenerating magnetic refrigeration working medium bed with an ambient temperature of 30°C and a refrigeration temperature of 5°C.

[0044] 1) Preparation of magnetic refrigeration powder materials:

[0045] Designed according to the requirements of the magnetic refrigerator and changing the content of the gap H by adjusting the hydrogen absorption process to prepare 10 kinds of magnetic refrigeration powder materials with a Curie point temperature from 7.5°C to 30°C (the interval is 2.5°C): La(FeSi) 13 h 1.05 , La(FeSi) 13 h 1.1 , La(FeSi) 13 h 1.15 , La(FeSi) 13 h 1.2 , La(FeSi) 13 h 1.25 , La(FeSi) 13 h 1.3 , La(FeSi) 13 h 1.35 , La(FeSi) 13 h 1.4 , La(FeSi) 13 h 1.45 and La(FeSi) 13 h 1.5 ;

[0046] 2) Preparation of sheet magnetic refrigerant bed components:

[0047] Each magnetic refrigeration powder material was evenly immersed in the epoxy resin bonding...

Embodiment 3

[0050] Embodiment 3: The present invention is used to realize an active magnetic regenerating magnetic refrigeration working medium bed with an ambient temperature of 30°C and a refrigeration temperature of 25°C.

[0051] 1) Preparation of magnetic refrigeration powder materials:

[0052] Design according to the requirements of the magnetic refrigerator and change the content of gap C and H by adjusting the hydrogen absorption process to prepare La(FeSi) with a Curie point temperature of 27.5°C 13 C 0.2 h 1.5 Magnetic refrigeration powder materials;

[0053] 2) Preparation of sheet magnetic refrigerant bed components:

[0054] La(FeSi) 13 C 0.2 h 1.5 The magnetic refrigeration powder material is uniformly immersed in the phenolic bonding colloid to obtain La(FeSi) 13 C 0.2 h 1.5 A mixture of magnetic refrigeration powder material and phenolic bonding colloid; the content of the phenolic bonding colloid accounts for 5% of the weight of the mixture; and then the mixture...

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Abstract

The invention discloses a magnetic refrigeration working medium bed, which is a cylindrical object comprising n magnetic refrigeration working medium bed assemblies, wherein n is 1-1000. The n magnetic refrigeration working medium bed assemblies are obtained by being arranged from high to low according to the Curie temperature or the phase-transition temperature of chosen magnetic refrigeration material; and each magnetic refrigeration working medium assembly is a flat sheet shaped assembly, a straight-wave flake-like assembly or a zigzag wavy flake-like assembly, so that a runner with high specific surface area and low resistance is conveniently formed. The preparation method comprises the following steps: firstly, preparing magnetic refrigeration powder material of which the Curie temperature or the phase-transition temperature is between the upper limit and the lower limit of a magnetic refrigerator working temperature zone; then, respectively dipping the magnetic refrigeration powder material into a bonding colloid; respectively putting into a die, and pressurizing to obtain flake-like magnetic refrigeration working medium bed assemblies; and arranging the obtained assembliesinto the cylindrical magnetic refrigeration working medium bed from high to low according to the Curie temperature point or the equivalent Curie temperature point of the chosen magnetic refrigeration material. The magnetic refrigeration working medium bed has the advantages of big heat-transfer specific surface area, small working medium flowing resistance, high magnetic refrigerator thermotechnical efficiency and the like.

Description

field of invention [0001] The invention belongs to the field of refrigeration and cryogenic engineering, and in particular relates to a magnetic refrigeration working medium bed and a preparation method, that is, a magnetic refrigeration working medium bed with a certain shape and structure made of powder magnetic refrigeration materials according to the use requirements of a magnetic refrigerator and its preparation method. Background technique [0002] Refrigeration equipment such as air conditioners and refrigerators are widely used in people's daily life and have become a necessity in modern society. At present, traditional vapor compression cycle refrigeration technology is mainly used. Its technology is mature and its application is wide. The destructive effects (main indicators: Ozone Destruction Coefficient (ODP) and Greenhouse Effect Coefficient (GWP)) have been of global concern for nearly 30 years, and scientists and engineers from various countries are constantly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25B21/00
CPCF25B21/00F25B2321/002Y02B30/66F25B2500/01Y10T29/49359Y02B30/00
Inventor 沈俊吴剑峰沈保根公茂琼戴巍
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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