The large-scale low-temperature refrigerator in the so-called liquid helium temperature zone refers to a large-scale low-temperature refrigeration system whose cooling temperature is in the temperature range of 4.5K (-268.65°C) and the cooling capacity is several hundred to 10,000 watts. Li Qing, the chief scientist of the project and a researcher at the Physical and Chemical Research Institute of the Chinese Academy of Sciences, said that this is a supporting technology for strategic high-tech fields such as science and engineering and aerospace engineering, and it is also a technology that restricts the export of developed countries to China.
It is worth mentioning that this technology is hidden behind a human problem that is still difficult to crack - approaching "absolute zero", ie, reaching -273.15°C, or 0 K with absolute temperature scale, which is the limit state of temperature in the universe. As soon as absolute zero is reached, atoms will stop moving. If 4.5°C, 4.5K (-268.65°C) is added, it is the target temperature of the liquid helium cooler, which is also a common liquid temperature zone.
Li Qing said that in 2015, also under the support of the national major scientific research equipment development project, the scientific research team he led succeeded in breaking through the cryogenic refrigeration technology in the “Liquid Hydrogen†temperature zone, and its cooling target temperature was 20K (-253.15°C). 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" and "superfluid helium" temperature zone of low-temperature refrigeration technology. Nowadays, liquid helium temperature zone refrigerators carrying this technology are available.
According to the opinion of experts participating in the meeting, the liquid helium chiller developed by the scientific research team of the Institute of Physics and Chemistry of the Chinese Academy of Sciences achieved a steady 84 hours of continuous operation, achieving a cooling capacity of 280 watts at a temperature of 4.35K (268.8°C, better than -268.65°C target). National production and production have reached the international advanced level.
On the same day, Li Qing also revealed that relying on the technology of this major scientific research equipment development project, the Institute of Physics and Chemistry of the Chinese Academy of Sciences has established an industrialized enterprise, which indicates that the research results of large-scale low-temperature refrigeration equipment in China are on the road to social application and is truly broken. International monopoly and laying a foundation for winning a place in the international cryogenic field.
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The high pressure common rail engine models under the national three standards also have higher quality requirements on diesel, because the high pressure injector needs to accurately control the injection pressure, injection time and injection amount, so the work is also more exquisite. If there is water or impurities in the diesel oil is not filtered clean, it will wear and tear the plunger couple in the nozzle until the injector is stuck. Fuel injector damage will cause engine acceleration instability or weak acceleration, or emissions of black smoke and other faults, affecting the normal operation of the vehicle.
As the first stage of the multistage filter system, the crude oil filter has the function of removing large particles and water.
In order to make the engine drink clean and good diesel, only for those who do not meet the standard of oil again a "secondary processing", and then add a set of oil-water separator is the most simple and practical method
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