Firstly, the system is pumped to 10-2 Pa by a rotary vacuum pump, and the oil in the diffusion pump is heated and boiled, so that the gas molecules in the system are continuously brought from the oil vapor jet to the ball tube of the elbow of the pump at high speed, and are pumped out when the gas density reaches the working range of the mechanical vacuum pump, thus gradually obtaining a high vacuum.
According to the working principle of vacuum pump, vacuum pump can be basically divided into two types, namely gas capture pump and gas transmission pump. Widely used in metallurgy, chemical industry, food, electronic coatings and other industries.
Extended data:
Whether the vibration generated by vacuum pump operation affects the process flow and environment. If the process does not allow, a vibration-free pump should be selected or vibration-proof measures should be taken. Under its working pressure, the vacuum pump should be able to exhaust all the gases generated in the process of vacuum equipment.
The working pressure of the vacuum pump shall meet the requirements of the extreme vacuum and working pressure of the vacuum equipment. For example, the vacuum drying process requires the working vacuum degree to be 10mmHg, and the ultimate vacuum degree of the selected vacuum pump should be at least 2mmHg, preferably 1mmHg. Generally, the limit vacuum degree of the pump is selected to be half to one order of magnitude higher than the working vacuum degree of the vacuum equipment.
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