The rotary vane oil-sealed mechanical pump (referred to as the rotary vane pump) is a variable-volume gas transmission vacuum pump and one of the most basic vacuum acquisition equipment in vacuum technology. Its working pressure range is 01325--4.0*10-1Pa. It can be used alone or as a fore-stage pump for other high vacuum pumps to remove dry gas from sealed containers. If it is equipped with a gas ballast device, it can also remove a certain amount of condensable gas. It is widely used in metallurgy, machinery, electronics, chemicals, light industry, petroleum and medicine. However, the rotary vane pump is not...