Specifications

56
Operating principle of the rotary vane pump
Single-stage
rotary vane pump
The pumping cycle is
given below:
Inlet
Transfer
Compression
Exhaust
Application
This is a volumetric pump, with a functional part composed of:
- A hollow cylindrical stator with inlet and exhaust valves.
- A rotor mounted eccentrically inside the stator for pumping.
- Two vanes sliding in the rotor, forced against the stator by centrifugal force
and springs.
As the vane passes in front of the
inlet orifice, an increasing space is
formed into which the gas from the
chamber to be evacuated expands.
When the second vane passes, the
space is closed.
The gas trapped in the space
between the two vanes is transferred
to the exhaust orifice as the rotor
rotates.
The space communicates with the
exhaust, which is fitted with a valve:
the gas is compressed until the safety
valve is opened.
The gas is expelled into the oil
casing when the pressure is sufficient
to open the valve.
Single stage rotary vane pumps are the best choice for continuous pressures
above 1.0 Torr (1,3 mbar), as well as applications where large amounts of
condensable gases are present.
In. Exh.
In. Exh.
In. Exh.
In. Exh.