Method for reducing axial conduction of cool storage material of heat regenerator of regenerative cryo refrigerator

Abstract

The invention relates to a method for reducing axial conduction of a cool storage material of a heat regenerator of a regenerative cryo refrigerator. When filling the cool storage material of the heat regenerator of the refrigerator, heat barriers made of the heat-insulating material are placed in a barrel of the heat regenerator at certain distance intervals, the cool storage material of the heat regenerator is separated into several thermally-unconnected sections, the middle part of each heat barrier is provided with small holes distributed evenly and densely, which has no influence on the reciprocal flow of the working medium in the heat regenerator, and the local part of each heat barrier is provided with small holes arranged regularly, which facilitates the heat exchange of the working medium and the cool storage material. The heat resistance of the heat barrier is more than 40 times of the heat resistance of the cool storage material of the heat regenerator having the same thickness, which has little influence on the heat efficiency of the heat regenerator. The invention reduces the axial conduction of the heat regenerator of the refrigerator effectively, ensures a directional and unblocked flow path of the working medium gas without any gas hold-up, and increases the effective refrigerating output and efficiency of the refrigerator. The method can be applied to a variety of regenerative cryo refrigerators.

Description

technical field [0001] The invention relates to a method for reducing axial heat conduction of cold storage material of a regenerator of a regenerative low-temperature refrigerator. Background technique [0002] In regenerative low-temperature refrigerators, such as Stirling refrigerators and GM refrigerators, the regenerator cold storage material plays the role of storing energy, and the alternating flowing cold and hot oscillating fluids are separated from each other in each cycle of the refrigeration cycle. The regenerator cool storage material performs heat exchange. The cold storage material of the regenerator requires high heat capacity and low thermal conductivity. Generally, metal materials such as stainless steel, beryllium bronze, nickel or lead are used. These materials have large heat capacity and low thermal conductivity at low temperatures, but compared with PTFE Non-metallic materials such as ethylene or polyimide still have a large thermal conductivity, resu...

AI Technical Summary

Problems solved by technology

The cold storage material of the regenerator requires high heat capacity and low thermal conductivity. Generally, metal materials such as stainless steel, beryllium bronze, nickel or lead are used. These materials have large heat capacity and low thermal conductivity at low temperatures, but compared with PTFE The thermal conductivity of non-metallic materials such as ethylene or polyimide is still very large, resulting in a large axial heat conduction loss of the regenerator, especially for the efficiency of low-temperature regenerative refrigerators with small cooling capacity.

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