Superfluid helium refrigerator

Abstract

The invention relates to a superfluid helium refrigerating machine which comprises a positive pressure compressor unit, a cold box, a helium pre-cooling module, a 4K cooling capacity obtaining module and a 2K cooling capacity obtaining module, and the helium pre-cooling module, the 4K cooling capacity obtaining module and the 2K cooling capacity obtaining module are all arranged in the cold box, and core refrigerating components such as the helium pre-cooling module, the 4K cooling capacity obtaining module and the 2K cooling capacity obtaining module are placed in the cold box. 4.5 K cooling capacity is obtained through series connection of multiple stages of turbine expansion units and high-pressure throttling refrigeration; a cold compressor unit and a negative pressure compressor are adopted for reducing pressure and cooling, and 1.8 K / 2K cooling capacity is obtained; according to the superfluid helium refrigerating machine, superfluid helium negative pressure return gas is directly compressed to medium pressure through the negative pressure compressor and is connected to an inlet of the high pressure compressor, the overall structure is compact, reliability and efficiency are high, the size is small, and the occupied area is small; and the precooling requirements of various application scenes can be met, and the applicability is wide.

Description

technical field [0001] The invention relates to the technical field of ultra-low temperature refrigeration, in particular to a superfluid helium refrigerator. Background technique [0002] Superfluid helium has a very high thermal conductivity, much higher than that of metals, thousands of times that of copper. Due to its excellent flow and heat transfer properties, superfluid helium is often used to cool superconducting magnets in many applications. Superfluid helium is almost inviscid and can easily penetrate inside the magnet, quickly eliminating thermal disturbances. Using superfluid helium to cool accelerators and superconducting magnets improves stability and reduces energy consumption and operating costs. [0003] Due to the advantages of lower temperature, extremely small viscosity and high thermal conductivity of superfluid helium, a variety of cryogenic refrigeration systems and refrigerators have been established using superfluid helium. The superfluid helium r...

AI Technical Summary

Problems solved by technology

Therefore, in general, the existing superfluid helium cryogenic system has low integration degree, complex overall structure, low reliability and efficiency, large volume and large footprint

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