On the 18th, supported by the Ministry of Finance, the Chinese Academy of Sciences Institute of Physics and Chemistry independently developed China's first set of 250W liquid helium temperature zone refrigerators in Hebei Langfang through expert acceptance, which marks the low-temperature refrigeration equipment R & D and manufacturing capacity to a new level, to fill the liquid helium temperature range of large-scale helium cryogenic refrigerator manufacturing technology gaps, breaking the developed countries in the field of technology monopoly.
The so-called liquid helium temperature large-scale low-temperature refrigerators, refers to the cooling temperature in the 4.5K (-268.65 ℃) temperature range, the cooling capacity of several hundred or more than a large low-temperature refrigeration system. The project chief scientist, Researcher Li Qing said that this is a large scientific engineering, aerospace engineering and other strategic high-tech field of support technology, but also developed countries to limit the output of China's technology.
It is worth mentioning that this technology is hidden behind a human problem difficult to solve the problem - approaching the 'absolute zero', that is -273.15 ℃, with the absolute temperature scale is 0 K, which is the temperature limit of the universe , Once the absolute zero, the atoms will stop moving. If coupled with 4.5 ℃, that is 4.5K (-268.65 ℃), is the liquid helium refrigerator target temperature, is also a common liquid helium temperature zone.
Li Qing said that in 2015, the same is in the national major scientific research equipment development project support, he led the research team successfully break through the 'liquid hydrogen' low temperature refrigeration technology, the cooling target temperature of 20K (-253.15 ℃). Then, the team began to enter the 'lower temperature' - the lower the temperature, the greater the difficulty - in order to break through the 'liquid helium' 'super-flow helium temperature zone of low-temperature refrigeration technology. Now, carrying this technology Helium temperature zone refrigerator available.
According to the acceptance of the views of experts, the Institute of Physics and Chemistry of the Chinese Academy of Sciences developed a liquid helium refrigerator to achieve a continuous 84 hours of stable operation, 4.35K (ie -268.8 ℃, better than -268.65 ℃ target) temperature cooling capacity of 280W, The national production, reached the international advanced level.
On the same day, Li Qing also revealed that relying on this major scientific research equipment development project technology, CAS Institute has been the creation of industrial enterprises, which marks the large-scale low-temperature refrigeration equipment.