Which main pumps should be selected for coating equipment? Vacuum system is very important in the coating equipment industry, which is one of the indispensable equipment. At present, the commonly used structure of vacuum system is composed of main pump and front pump in series, plus valve pipeline and vacuum measuring instrument. The selected main pump is basically divided into two forms, which are oil vacuum system and oil-free vacuum system.

So what is oil vacuum system and oil-free vacuum system? Let's make it up for you
The oil diffusion pump is the main pump in the oil vacuum system, and the mechanical pump or roots pump is used in the front pump. We know that the pressure direction of the oil diffusion pump is relatively large, and the pumping rate is very high, which can reach more than 100000 liters per second. Its working ability is among the best in the industry, which also benefits from its good performance. In terms of advantages, the oil vacuum system works reliably, has no vibration, no noise, has long service life, and has low overdraft cost for maintenance and filing, which many manufacturers like to use. But its disadvantages are also very obvious, that is, it will form pollution sources, and large-scale pumps are more serious in this respect.
Oil free vacuum Xiyong uses molecular pump and cryogenic pump as the main pump. Its main characteristics are that it can pump a large amount of air continuously and obtain clean and oil-free ultra-high vacuum. Moreover, the system has fast start-up time and short pump stop time. However, the pumping speed of heavy gas is faster than that of light gas, and the pumping speed of steam type is slower. When a large amount of gas passes through the pump, the pumping speed will drop quickly.
The two kinds of vacuum coating equipment have their own advantages and disadvantages, users should consider their own needs to choose.