Although the rotary vane vacuum pump has many advantages compared with other types of mechanical pumps, there are also many disadvantages, especially it is still far from the production practice requirements. For example, in terms of corrosion resistance, wear resistance, small size, light weight, low noise, low vibration, automatic prevention of oil backflow, removal of oil vapor backflow, etc., all efforts are required. In order to meet the needs of instrument development, the small rotary vane vacuum pump below 18 liters/second has been developed to miniaturized instrumentation.

In the old-fashioned mechanical pump, the pumping speed drops a lot with the increase of the vacuum degree during pumping. In recent years, the pumping speed curve (horizontal line) has been extended to almost 1x10- 3 tor.

In the research of clean vacuum, in order to avoid the backflow of oil vapor, it was proposed that the high vacuum stage seal of the rotary vane vacuum pump should be made of solid lubricant (dry stage), and the general oil-sealed rotary vane vacuum pump should be used as the front stage (oil-sealed stage). two-stage pump.

Of course, a more thorough solution to oil vapor backflow is to try to develop an oil-free mechanical vacuum pump. It has been studied for many years at home and abroad, and many types have been developed. However, a pump that can start to pump air from the atmosphere and can work continuously and has similar performance to the existing oil-sealed mechanical pump is still under development and has no official product. It is believed that with the advancement of vacuum technology, rotary vane vacuum pumps with good performance and adaptable to various operating requirements will emerge.