This article is to introduce the main rotary vane vacuum pump structure of oil-sealed rotary vane vacuum pumps.
Rotary vane vacuum pump is a mechanical pump
A rotary vane vacuum pump is an oil-sealed mechanical vacuum pump, which is one of the main vacuum pump types used in vacuum technology. The rotary vane vacuum pump can pump out the dry gas in the sealed container, and if it is equipped with a gas ballast, it can also pump out a certain amount of condensable gas. However, it is not suitable for pumping out gases with high oxygen content, corrosive to metals, chemical reaction to pump oil and particles of dust. There are totally two types of rotary vane vacuum pumps: single-stage (1-stage) and dual-stage (2-stage, double-stage) .
Rotary vane vacuum pump is a volumetric pump
The rotary vane vacuum pump is a volumetric pump, which draws in and squeezes the gas by the continuous operation of the rotary vane in the pump chamber, and finally discharges it by the exhaust line. The main components of a rotary vane pump are stator, rotor and rotary vanes, etc. The rotor is installed eccentrically into the stator cavity. There are two rotary vanes in the rotor groove, and small springs are placed between the two vanes. The inlet and exhaust lines on the stator are separated into two parts by the rotor and the rotary vanes.
When the rotor rotates in the stator cavity, the end of the rotor slides against the inner wall of the pump cavity under the joint action of spring tension and its own centrifugal force, which periodically expands the volume of the cavity on the inlet side and draws in the gas, and slowly reduces the volume of the exhaust pipe, squeezing the drawn-in gas, and then discharging it from the exhaust line.
Rotary vane pumps for industrial use and for HVAC application
A professional rotary vane vacuum pump for industrial applications can work 24/7 thanks to its robust structure and components. A rotary vane vacuum pump for HVAC application however, doesn’t need to achieve such level although the working structure is the same. It takes only a few minutes to discharge refrigerants. If a refrigeration pump is used somewhere else, remember don’t keep it running more than 2 hours each time. Otherwise, the service life of the pump will be shortened. Even so, the service life of a HVAC pump is designed for about 2 years, while the industrial pump usually works 5 years or more in condition of proper use and regular maintenance.
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