Superfluid helium refrigerator with independent load test cold box

Abstract

The invention relates to a superfluid helium refrigerator with an independent load test cold box. Comprising a compressor unit, a refrigerator cold box, a load test cold box, a helium pre-cooling module, a multi-stage turbine expansion unit, a heat exchanger unit, a subcooler and a cold compressor unit which are all arranged in the refrigerator cold box, and a gas-liquid separator, a 50-75K temperature zone load, a 4.5-75K temperature zone load and a 2K load which are all arranged in the load test cold box, according to the superfluid helium refrigerating machine, a refrigerating part and a load testing part are separated through the refrigerating machine cold box and the load testing cold box, the load testing cold box is only used in the load cooling capacity testing stage and can be removed after the superfluid helium refrigerating machine is delivered to a user, and due to the design, the refrigerating machine cold box is compact in structure and high in reliability. The test load of each temperature zone is prevented from becoming idle heat capacity after the load test stage and occupying the cold box space of the refrigerator.

Description

technical field [0001] The invention relates to the technical field of ultra-low temperature refrigeration, in particular to a superfluid helium refrigerator with an independent load test cold box. Background technique [0002] Superfluid helium has a very high thermal conductivity, much higher than that of metals, thousands of times that of copper. Because superfluid helium has excellent flow and heat transfer properties, it 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 can improve stability and reduce energy consumption and operating costs. 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 superfl...

AI Technical Summary

Problems solved by technology

When the superfluid helium refrigerator involves external cooling test loads in multiple temperature zones, it is necessary to build a load test platform outside the refrigerator, which occupies a large area and the connection lines are relatively complicated

The built-in cooling capacity test load is placed inside the cold box of the refrigerator, which is easy to arrange and does not require an external power module. However, after the cooling capacity test is completed, the test load is no longer used, and it is placed inside the cold box to become an idle heat capacity, occupying the cold box of the refrigerator. precious space

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