A method for reducing axial heat conduction of regenerator regenerator material of regenerative cryogenic refrigerator

Abstract

The invention relates to a method for reducing the axial heat conduction of a regenerator cold storage material by a regenerative low temperature refrigerator. In this method, when filling the cold storage material of the regenerator of the refrigerator, the thermal barrier made of the heat insulating material is put into the regenerator cylinder according to a certain interval distance, and the cold storage material of the regenerator is divided into several sections that are thermally disconnected. There are even and densely distributed small holes in the middle of the blocker, which does not affect the reciprocating flow of the working medium in the regenerator, and the small holes are arranged locally and regularly, which is beneficial to the heat exchange between the working medium and the cold storage material. The thermal resistance of the thermal isolator is more than 40 times that of the thermal storage material of the same thickness of the regenerator, but it has little effect on the thermal efficiency of the regenerator. The invention effectively reduces the axial heat conduction of the regenerator of the refrigerator, and the directional flow path of the working medium gas is unobstructed without gas retention, thereby improving the effective cooling capacity and efficiency of the refrigerator. This method can be applied to various regenerative cryogenic 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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