Magnetic refrigerant bed and method for manufacturing the same

Abstract

The present invention provides a magnetic refrigerant bed, which is a column composed of n magnetic refrigerant bed components, and these n magnetic refrigerant bed components are arranged in a descending order according to Curie temperatures or phase transition temperatures of the magnetic refrigeration materials used, wherein n=1-1000. The magnetic refrigerant bed components are flat sheets ( 1 ), straight wave-shaped sheets ( 2 ) or zigzag wave-shaped sheets ( 3 ) which can easily form a magnetic refrigerant bed with high specific surface area and flow channels of low resistance. And a method for manufacturing a magnetic refrigerant bed is also provided, which comprises the following steps: preparing magnetic refrigeration powder materials with Curie temperatures or phase transition temperatures in the operating temperature range of a magnetic refrigerator; and immersing the magnetic refrigeration powder materials into binder respectively; then loading the mixture into molds respectively and pressing the mixture into sheet magnetic refrigerant bed components; then arranging and assembling the obtained components in a descending order according to Curie temperatures or phase transition temperatures of the used magnetic refrigeration materials to obtain a columnar magnetic refrigerant bed. The magnetic refrigerant bed has advantages of large heat transfer specific surface area and small flow resistance of the refrigerant.

1 . A magnetic refrigerant bed, which is a column composed of n magnetic refrigerant bed components, wherein n=1-1000, the n magnetic refrigerant bed components are arranged in a descending order according to Curie temperatures or phase transition temperatures of magnetic refrigeration materials used;
 the magnetic refrigerant bed components are in the shape of a flat sheet, straight wave-shaped sheet or zigzag wave-shaped sheet, by which a magnetic refrigerant bed with high specific surface area and flow channels of low resistance can be easily formed, and the magnetic refrigerant bed components have a thickness of 0.1-2.0 mm.   
     
     
         2 . The magnetic refrigerant bed according to  claim 1 , wherein the lengths of the n magnetic refrigerant bed components are identical, partially identical or different from each other. 
     
     
         3 . The magnetic refrigerant bed according to  claim 1 , wherein the column is a column with constant circular section, a column with constant triangular section or a column with constant polygonal section. 
     
     
         4 . The magnetic refrigerant bed according to  claim 1 , wherein the wave is sinusoidal periodic wave or triangular periodic wave, and the ratio between the half peak height of the periodic wave and the thickness of the magnetic refrigerant bed component is 0.5-2.0. 
     
     
         5 . The magnetic refrigerant bed according to  claim 1 , wherein the Curie temperatures or phase transition temperatures of the magnetic refrigeration materials used for making the adjacent magnetic refrigerant bed components of the magnetic refrigerant bed components are the same or different. 
     
     
         6 . A method for manufacturing a magnetic refrigerant bed, comprising the following steps:
 1) preparing magnetic refrigeration powder materials:   preparing magnetic refrigeration powder materials with Curie temperatures or phase transition temperatures between the upper limit and lower limit of magnetic refrigerator operating temperature range;   2) preparing sheet magnetic refrigerant bed components:   immersing the prepared different magnetic refrigeration powder materials uniformly into binder respectively to obtain mixtures containing the magnetic refrigeration powder materials and the binder; then loading the mixtures into molds respectively and pressing the mixtures into sheets; and then demoulding and curing the sheets to form magnetic refrigerant bed components, or further processing the demoulded and cured sheets to form magnetic refrigerant bed components; wherein the sheet magnetic refrigerant bed components are in the shape of a flat sheet, straight wave-shaped sheet or zigzag wave-shaped sheet, by which a magnetic refrigerant bed with high specific surface area and flow channels of low resistance can be easily formed, and the sheet magnetic refrigerant bed components have a thickness of 0.1-2.0 mm;   wherein the binder is compatible with the immersed magnetic refrigeration powder materials and can be applied in corresponding operating temperature range;   wherein the binder accounts for 0.1 wt %-10 wt % of the mixture consisting of the magnetic refrigeration powder material and the binder;   3) then arranging and assembling the obtained magnetic refrigerant bed components in a descending order according to Curie temperatures or phase transition temperatures of the magnetic refrigeration materials used to obtain a column-shaped magnetic refrigerant bed.   
     
     
         7 . The magnetic refrigerant bed and its preparation method according to  claim 6 , wherein the lengths of magnetic refrigerant bed components are identical, partially identical or different from each other. 
     
     
         8 . The magnetic refrigerant bed and its preparation method according to  claim 6 , wherein the Curie temperatures or phase transition temperatures of the magnetic refrigeration materials used for making the adjacent magnetic refrigerant bed components of the magnetic refrigerant bed components are the same or different. 
     
     
         9 . The magnetic refrigerant bed and its preparation method according to  claim 6 , wherein the column is a column with constant circular section, a column with constant triangular section or a column with constant polygonal section. 
     
     
         10 . The magnetic refrigerant bed and its preparation method according to  claim 6 , wherein the wave is a sinusoidal periodic wave or triangular periodic wave, and the ratio between the half peak height of the periodic wave and the thickness of the sheet magnetic refrigerant bed component is 0.5-2.0.