Regeneration-type variable-porosity heat regenerator for low temperature refrigerator

Abstract

The invention discloses a regeneration-type variable-porosity heat regenerator for a low temperature refrigerator. The heat regenerator comprises a low temperature section and a high temperature section. A plurality of layers of regeneration fillers with different porosities are filled in the heat regenerator, and the porosity range of the regeneration fillers filled in the heat regenerator is 59%-92%. According to different proportions of various losses in the heat regenerator at different temperatures, regeneration fillers with different porosities are adopted in different temperature sections of the heat regenerator. Compared with the traditional heat regenerator filled with fillers with fixed porosity, the heat regenerator effectively reduces inside loss, improves heat regeneration efficiency and improves refrigerator efficiency.

Description

technical field [0001] The invention relates to a regenerator, in particular to a variable porosity regenerator for a regenerative low-temperature refrigerator. Background technique [0002] The regenerative cryogenic refrigerator is a mechanical device that obtains cooling capacity based on the principle of adiabatic expansion of gas. It mainly includes Stirling refrigerators, GM refrigerators and pulse tube refrigerators. It is widely used in aerospace, national defense and military, low temperature superconductivity, medical equipment and other fields. As the core component of the regenerative cryogenic refrigerator, the function of the regenerator is to add and remove heat from the working fluid at different stages of a thermal cycle, and pump the heat from the cold end to the hot end to remove it to achieve refrigeration. the goal of. Usually, the cooling loss caused by the regenerator of a Stirling refrigerator accounts for 57% of the total loss, so the efficiency of...

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Problems solved by technology

This will lead to the final filling selection of the regenerator to be a compromise between the different requirements for the porosity of the hot and cold ends of the regenerator (such as figure 1 As shown, usually the heat capacity of the material at room temperature is much larger than that of the gas working fluid, and the flow resistance loss is more important than the heat transfer, so high porosity is required, while the specific heat of the filler at the low temperature end is close to that of the working fluid, and low porosity is required to increase the heat transfer area), It is impossible to make each section of the regenerator work at the highest efficiency state, so it will undoubtedly significantly increase the loss of the regenerator, especially in the deep low temperature region (liquid helium temperature region) and high-power regenerative refrigerators, especially for the regenerator Efficiency is very unfavorable

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