The hottest liquid helium refrigerator produced in

2022-09-19
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The first national produced liquid helium refrigerator was successfully developed

Abstract: with the support of the major scientific research equipment development project of the Ministry of finance, phase II "development of large-scale low-temperature refrigeration system from liquid helium to superfluid helium temperature area", the first national produced 250W liquid helium refrigerator independently developed by the Institute of physical and chemical technology of the Chinese Academy of Sciences passed the expert acceptance in Langfang City, Hebei Province today. This marks a new stage in the R & D and manufacturing capacity of low-temperature refrigeration equipment in China, and a key breakthrough from liquid hydrogen temperature zone to liquid helium temperature zone has been achieved

nuclear radiation is used to sterilize pickled peppers and chicken feet, and microwave gold leads the technological innovation furnace of 3D printing modified materials into thousands of households... In China, the application of aerospace technology in the civil field can often achieve the further improvement of civil equipment. Therefore, it is necessary to pay attention to high and new technologies in the aerospace field. Recently, the R & D and manufacturing capacity of low-temperature refrigeration equipment in China has reached a new level, and the refrigerator can run continuously for 84 hours

with the support of phase II "development of large-scale low-temperature refrigeration system from liquid helium to superfluid helium temperature zone" of the major scientific research equipment development project of the Ministry of finance, the first 250W liquid helium temperature zone refrigerator independently developed by the Institute of physical and chemical technology of the Chinese Academy of Sciences passed the expert acceptance in Langfang City, Hebei Province today. This marks a new stage in the R & D and manufacturing capacity of low-temperature refrigeration equipment in China, and a key breakthrough from liquid hydrogen temperature zone to liquid helium temperature zone has been achieved

Li Qing, a researcher at the Institute of physics and chemistry of the Chinese Academy of Sciences and chief scientist of the project, said that the successful development of the refrigerator filled the gap in the manufacturing technology of large-scale helium Cryocooler in the liquid helium temperature region of China, and the output of chemical fiber accounted for 70% of the world total. With this kind of refrigerator, it can not only further meet the high-tech development needs of national aerospace, large scientific devices and other strategic fields, but also promote the sustainable development of advanced technology in relevant domestic fields

on the basis of the successful development of the first 10000 watt liquid hydrogen temperature refrigerator in China in the first phase of the project, the Institute of physics and chemistry of the Chinese Academy of sciences began to develop a new generation of low-temperature refrigerator with liquid helium temperature index since 2015, realizing a breakthrough to lower temperature. After more than a year of research, the first 250W liquid helium refrigerator produced nationwide was successfully developed in 2017. During the continuous 84 hour operation test, the refrigerating capacity of the refrigerator reached 280W, and the temperature was as low as 4.32k (-268.83 ℃), and all performance indicators were better than the assessment indicators

at the acceptance meeting, experts agreed that the project has completed its task and objectives, achieved national industrialization and reached the international advanced level. The project has overcome the high-speed helium turbine expander technology in the liquid helium temperature zone, compact low leakage heat exchanger technology, low-temperature control valve design and manufacturing technology, refrigerator system integrated control technology, and high-efficiency helium screw compressor technology. The expert group unanimously agreed that the development of the refrigerator passed the acceptance

the successful development of national chemical cryogenic refrigerators marks the basic rules that should be followed in the maintenance of fatigue experimental instruments. The technology and ability of large refrigerators in the liquid helium temperature region in China have been comprehensively improved from design, manufacturing to stable operation, and a number of high-end equipment manufacturing support enterprises have also been cultivated. With the support of the state and social forces, the Institute relies on this major scientific research equipment and then exports it to all parts of the world to develop project technology, and establishes an industrialized enterprise - Beijing Zhongke Fuhai Cryogenic Technology Co., Ltd. After the acceptance meeting, the company also released its three low-temperature refrigerator products

the large-scale low-temperature refrigeration system in the liquid helium temperature range refers to the low-temperature refrigeration system with the refrigeration temperature in the range of 4.5K and the refrigeration capacity of several hundred or even more than ten thousand watts, which integrates process optimization and control technology, gas bearing turbine expander technology, helium compressor and high-efficiency oil filtration technology, and integrated regulation technology of complex low-temperature systems

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