Two-stage Stirling cycle refrigerator capable of reaching liquid helium temperature range

Abstract

The invention relates to the technical field of Stirling cycle refrigerator, and specifically relates to a two-stage Stirling cycle refrigerator capable of reaching the liquid helium temperature range. The two-stage Stirling cycle refrigerator comprises a single-stage integral linear free piston Stirling refrigerator, a linear compressor and a single-stage Stirling pulse tube refrigerator. The single-stage Stirling pulse tube refrigerator comprises a water cooler (or an air cooler), a heat regenerator, a cold end heat exchanger, a pulse tube, a hot end heat exchanger, an inertia tube and a gas reservoir. The heat regenerator is communicated with the pulse tube through a U-shaped tube. The single-stage linear free piston Stirling refrigerator is connected with the heat regenerator of the pulse tube refrigerator through a copper thermal bridge. An output end of the linear compressor is connected with the water cooler; the output end can further be connected with the inertia tube through a bidirectional gas inlet valve. The two-stage Stirling cycle refrigerator can reach the liquid helium temperature range through the two stage of Stirling circulation structures, with the structure of the refrigerator being further simplified, and with the size and the weight of the refrigerator being further reduced.

Description

[0001] technical field [0002] The invention relates to the technical field of Stirling cycle refrigerators, in particular to a two-stage Stirling cycle refrigerator capable of reaching the temperature range of liquid helium. Background technique [0003] Many instruments have better performance and efficiency, higher operating speed and sensitivity at deep low temperature, especially in the liquid helium temperature zone. Therefore, the low-temperature refrigeration technology in the liquid helium temperature zone has important research significance, and has important applications in aerospace, national defense, low-temperature superconductivity, medical treatment and other fields. [0004] There are mainly two ways to obtain a low temperature environment in the liquid helium temperature zone, including a liquid helium cryostat or a liquid helium temperature zone cryogenic refrigerator. The former uses liquid helium as a cold source, which can achieve high reliability a...

AI Technical Summary

Problems solved by technology

Although the volume and weight of this refrigerator are more advantageous than those of the G-M refrigerator, the refrigeration system has many stages, the structure is too complicated, and the efficiency is low.

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