Due to the space simulation device has a volume of the pumping container from thousand cubic meters to tens of thousands of cubic meters, the vacuum pressure changes from from tens of thousands of Pascal to several Pascal, and the pumped gas contains a large amount of water vapor or a part of nitrogen oxides, so The first problem encountered with this vacuum system is the pre-vacuum problem. If selected the rotary piston vacuum pump as the backing pump, it may exist some problems as below listed:
Firstly, the slide valve pump runs for a long time under high inlet pressure. Due to the air carrying effect, the fuel injection phenomenon is very serious. One is to waste a lot of expensive oil, and the other is to pollute the environment;
Since the pumped gas contains a large amount of water vapor or nitrogen oxides, once the gas enters the pump, the vacuum pump oil will be rapidly emulsified and deteriorated, and the sealing property of the oil will be destroyed, resulting in a decrease in vacuum performance and even destruction of the pump;
LG Series Screw Vacuum Pump
It may need more pumps and the vibration and noise of the rotary piston vacuum pump are also large;
The dry screw vacuum pump produced by Shanghai EVP Vacuum Technology Co., Ltd. has become the first choice for large-scale space simulation vacuum system due to its advantages of clean and oil-free, large pumping speed, low vibration and low noise. In addition, in order to increase the pumping speed and ultimate vacuum of the vacuum unit and correspondingly reduce the size of the screw pump, a two-stage unit or two Roots pumps in series with a screw vacuum pump and a screw vacuum pump are generally connected in series. The three-stage unit is composed. To prevent particulate impurities from entering the pump, an inlet filter is placed at the inlet of the vacuum unit with an accuracy of 50 μm.
tags: Rotary piston vacuum pump, dry screw vacuum pump
Edited by Catherine Qin / EVP Vacuum Solution
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