Ultimate pressure of rotary vane vacuum pump

Rotary vane type oil seal mechanical pump (referred to as rotary vane pump) is a variable-capacity gas transfer vacuum pump, which is one of the most fundamental vacuum equipment in vacuum technology. Its working pressure scale is 101325~1.33 10-2pa, is a low vacuum pump. It can be used alone or as a front stage pump for other high vacuum pumps to remove dry gas from sealed containers. It is widely used in metallurgy, machinery, electronics, chemical industry, light industry, petroleum and medicine, etc. But rotary vane pump is not suitable for the removal of oxygen content is too high, explosive, corrosive to metals, and pump oil will have a chemical reaction, rich in dust particles of gas.
Rotary vane vacuum pump for small and medium-sized pumps, there are single and double - stage two. Usually multi - stage pump, can achieve higher vacuum.
With the increase of the number of the application of rotary vane and the expansion of the application field, it is more urgent to reduce the volume of the pump, reduce the weight of the pump, reduce the power consumption, reduce the noise of the pump, avoid the oil injection of the pump, and improve the speed of the pump is an important way to improve the pump function. High speed direct pump has gradually developed from small to medium pump. In foreign countries, the use of direct pump is quite widespread, China with the rotary vane data and pump oil quality progress, the continuous improvement of pump structure, medium direct pump research and development and application will be carried out quickly.
Pump start work soon, the lowest pressure P'g. The pump continues to work. Due to the increase of pump temperature, the full steam pressure of the pump oil rises and the viscosity drops. The inlet pressure rises slightly to Pg. Pg is the stable minimum pressure obtained by the pump, and also the ultimate pressure of the pump.
The ultimate pressure of rotary vane vacuum pump is related to the type of vacuum gauge used in measurement. The ultimate pressure measured by a compact vacuum gauge is about an order of magnitude lower than that measured by a heat conduction vacuum gauge (thermocouple gauge or picometer, etc.). This is because the former can only measure the partial pressure of a persistent gas, while the latter measures the total pressure of the pressed gas. The current rules in China use the compact vacuum gauge to measure the extreme pressure of oil seal mechanical pump. With the increase of the oil, the better the sealing effect, the pump limit pressure and oil contact changes, eventually reached the oil full vapor pressure Po. In fact, the pump oil is rich in a lot of air and water, pump oil into the pump chamber, the absorption of air and water in the pump oil released, the pump limit pressure and oil amount of contact upward. Usually pump oil should adhere to the specified oil level, so that the pump must adhere to the amount of circulating oil. As for the two-stage pump, the pump oil can only enter the high vacuum stage after degassing in the low vacuum stage, so that the pump oil's air release in the high vacuum stage can be reduced to reduce the ultimate pressure of the pump.
The ultimate pressure of vacuum pump is related to the working temperature of pump oil. The higher the oil temperature, the higher the full oil vapor pressure, the higher the ultimate pressure of the pump.
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