Low-temperature medium liquefaction device

Abstract

The invention relates to a low-temperature medium liquefaction device which comprises a Dewar and a heat exchange assembly, wherein the heat exchange assembly comprises a heat exchanger, a sleeve, a refrigerator cold head, a collector tube and a transmission tube; the upper end of the sleeve is hermetically and fixedly connected to the upper part of an inner cavity of the Dewar, and the lower end of the sleeve is hermetically and fixedly communicated with the collector tube; one end of the transmission tube is hermetically and fixedly communicated with the lower part of the collector tube, the middle part of the transmission tube is hermetically and fixedly connected with the Dewar, and the other end of the transmission tube is communicated to a cooled object outside the Dewar; the upper part of the refrigerator cold head is hermetically and fixedly connected with the Dewar, the lower part of the refrigerator cold head is arranged in the inner cavity of the sleeve, and the lower end of the refrigerator cold head is connected with the heat exchanger. The low-temperature medium liquefaction device disclosed by the invention has the advantages that: the heat transfer area at the low-temperature end of the refrigerator cold head is fully utilized, the heat leakage quantity is reduced, the working efficiency is improved, the energy resources are saved, the convenience for assembly and disassembly is achieved, and the manufacturing and maintaining cost is reduced.

Description

technical field [0001] The invention relates to a low-temperature medium liquefaction device, which is particularly suitable for the situation where a single or multiple refrigerators are required to integrate liquefaction of low-temperature medium, and belongs to the technical field of liquefaction. Background technique [0002] The refrigerator integration technology in the prior art mainly adopts two methods, the first one is: the cold head of the refrigerator is placed in a vacuum, the end of the cold head of the refrigerator is connected to a heat exchanger, and the heat exchanger is connected to a low-temperature medium (such as liquid neon, The container where the liquid hydrogen is located is welded, and the low-temperature medium in the container is cooled and liquefied by a heat exchanger; the second is that the cold head of the refrigerator is placed in the wide-mouth Dewar liner, and the low-temperature liquid medium is placed on the bottom of the wide-mouth Dewar...

AI Technical Summary

Problems solved by technology

The main disadvantages of the first structure are: (1) The bottom surface of the low-temperature end of the cold head of the refrigerator transfers cold energy to the cooling medium through the cold head heat exchanger, but the side surfaces of the low-temperature end are all in a vacuum environment, and the heat transfer area of ​​this part is not used; (2) Since the cold head of the refrigerator is in a vacuum environment, the installation, maintenance and disassembly of the cold head of the refrigerator are very inconvenient

The Dewar vacuum is destroyed when the cold head is disassembled, and it needs to be vacuumed again after each reinstallation. Due to the long vacuuming time and complicated pumping process, this brings great inconvenience to the maintenance operation of the cryogenic medium liquefaction device sex

The main disadvantage of the second structure is that the wide-mouth Dewar neck tube is too large in diameter, which is easy to form natural convection, resulting in large heat leakage. At the same time, the Dewar inner cavity has a large space, which increases the gas demand for low-temperature media.

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