Detachable linear low-temperature pulse tube refrigerating machine and experimental device

Abstract

The invention designs a detachable linear low-temperature pulse tube refrigerating machine and an experimental device. The detachable linear low-temperature pulse tube refrigerating machine is composed of a linear compressor, an after-stage cooler, a heat regenerator, a cold-end heat exchanger, a pulse tube, an inertia tube, a gas reservoir, a vacuum cover and a vacuum cover connecting piece. The heat regenerator is filled with two kinds of meshes of silk screens in a mixed mode. The inertia tube is of a two-section inertia tube structure. The cold-end heat exchanger adopts a slit structure to enhance heat exchange, and two sides of the cold-end heat exchanger protrude and are sealed by indium wires to ensure no air leakage at low temperature; one side of the cold-end heat exchanger is connected with the heat regenerator to plug an inner hole at the cold end, so that the axial heat conduction loss is reduced, and the refrigeration performance is improved; and one side of the cold-end heat exchanger is connected with the pulse tube, and a laminar flow screen at the cold end is pressed, and a conical structure ensures that a gas working medium can enter the pulse tube at a constant speed. The vacuum cover, the pulse tube and the vacuum cover connecting piece of the experimental device are connected through screws and can be freely detached, and the heat regenerator, the cold end heat exchanger and the pulse tube are wrapped in the vacuum cover, so that the vacuum environment of a cold head of the refrigerating machine is achieved, cold loss caused by heat conduction and convection is avoided, and experimental measurement is guaranteed.

Description

technical field [0001] The invention relates to the field of low temperature technology, in particular to a detachable linear low temperature pulse tube refrigerator and an experimental device. Background technique [0002] There are no moving parts at the cold end of the pulse tube refrigerator, which is characterized by high efficiency, compactness, and high reliability. It is widely used in aerospace, low-temperature superconductivity, and low-temperature medicine. There are three types of pulse tube refrigerators: U-shaped, coaxial, and linear. Among them, the regenerator and pulse tube of the linear pulse tube refrigerator are on the same straight line, which reduces the flow resistance loss of the working medium and can improve Refrigerator cooling efficiency. [0003] Existing linear pulse tube refrigerators include compressors, connecting pipes, after-stage coolers, regenerators, cold-end heat exchangers, pulse tubes, hot-end heat exchangers, inertia tubes and gas s...

AI Technical Summary

Problems solved by technology

The refrigeration performance of a low-temperature pulse tube refrigerator must be measured accurately in a vacuum environment, but the cold end of a linear low-temperature pulse tube refrigerator is located between the regenerator and the pulse tube, and a vacuum cover must be designed in the middle to accurately measure the cooling capacity to become a straight line A Difficult Problem of Type Low Temperature Pulse Tube Refrigerator

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