Supercooling liquid nitrogen circulating system based on GM refrigerating machine

Abstract

The invention discloses a supercooled liquid nitrogen circulating system based on GM refrigerating machines, which comprises a plurality of GM refrigerating machines which are independently mounted in parallel and are used as system cold sources; each GM refrigerator comprises an independent vacuum cavity and a cold head heat exchanger; the supercooling liquid nitrogen pool and the surge tank are arranged in the vacuum cover, and a main heat exchanger and a precooling heat exchanger are soaked in the supercooling liquid nitrogen pool; the liquid nitrogen pump is connected between the supercooled liquid nitrogen pool and the surge tank; the pre-cooling heat exchanger is located in front of an inlet of the liquid nitrogen pump and used for improving the degree of supercooling when liquid nitrogen enters the liquid nitrogen pump, and the main heat exchanger is located behind an outlet of the liquid nitrogen pump and used for cooling the liquid nitrogen; and the supercooled liquid nitrogen pool is connected with a thermal load at a liquid return port and a liquid outlet through vacuum heat insulation pipes to form a closed liquid nitrogen circulation loop. The long-time stable operation of the liquid nitrogen circulating system can be ensured.

Description

technical field [0001] The invention belongs to the technical field of cryogenic refrigerators, and in particular relates to a subcooled liquid nitrogen circulation system based on a GM refrigerator. Background technique [0002] With the rapid development of superconducting technology, refrigeration systems that provide a low-temperature environment for superconducting materials have received more and more attention. Especially in recent years, when the superconducting critical temperature range rises to the liquid nitrogen temperature range, more and more applications such as high-temperature superconducting cables, high-temperature superconducting motors and low-temperature undulators need to use supercooled liquid nitrogen circulation systems. Guided application scenarios have been fully developed from experimental research to engineering applications, and the application field has gradually expanded. In application scenarios with high reliability requirements, a more s...

AI Technical Summary

Problems solved by technology

Among them, the reverse Brayton cycle refrigerator has the characteristics of large cooling capacity, high cost, complex structure, short maintenance cycle, and high maintenance cost; the Stirling refrigerator has the characteristics of large cooling capacity, weak operability, and short maintenance time; Decompression refrigeration has the characteristics of liquid nitrogen consumption, unstable operation, frequent operation, etc.

These common methods have problems such as high cost, high operating cost and poor stability in industrial production.

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