Multi-pass regenerators for regenerative cryogenic refrigerators

Abstract

A multipath heat regenerator for a heat regenerative type cryogenic refrigerator comprises an internal thermal barrier layer, an external thermal barrier layer, low temperature section padding, intermediate temperature section padding and high temperature section padding, wherein the internal thermal barrier layer and the external thermal barrier layer are arrayed coaxially along an air returning tube from inside to outside, and three areas divided by the two thermal barrier layers in the radial direction are filled with the low temperature section padding, the intermediate temperature section padding and the high temperature section padding from inside to outside. The two thermal barrier layers constitute the three-path structure of the heat regenerator, the axial temperature gradient of the whole heat regenerator is reduced, and axial heat conduction loss is lowered. The level-by-level increasing porosity of the padding of the heat regenerator effectively lowers the flow resistance loss, increases the heat exchange area, and lowers insufficient heat exchange loss. The refrigerating performance of the cryogenic refrigerator is improved by the heat regenerator padding with larger specific heat per volume than that of helium gas.

Description

technical field [0001] The invention relates to a technology in the field of regenerators, in particular to a multi-flow regenerator for regenerative cryogenic refrigerators. Background technique [0002] Regenerative low-temperature refrigerator is a mechanical device that obtains cooling capacity based on the principle of temperature drop caused by adiabatic expansion of gas. It is currently widely used in aerospace, national defense, high-temperature superconductivity, medical equipment and other fields, such as Cooling of photoelectric remote sensing components, cooling of high-temperature superconducting transformers in electrical technology, nuclear magnetic imagers and low-temperature medical cold knives in the medical field, etc. [0003] The regenerator is the core component of the recuperative cryogenic refrigerator. During the working process of the cryogenic refrigerator, the cold and hot air flows through the regenerator alternately, and the heat exchange betwee...

AI Technical Summary

Problems solved by technology

However, the setting of the buffer chamber in this technology increases the volume of the regenerator and reduces the filling space of the cold storage material. Although the arrangement of several through holes on the tube wall of the partition tube strengthens the radial heat conduction of the regenerator to a certain extent, but More is increased flow resistance loss

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