The mechanical requirements for air pumps for vacuum service are the following:
( 1 ) Flow of already very thin air should not be impeded by any pump inlet check valves.
( 2 ) The machine must have the ability to capture, compress
and exhaust the air away from the
chamber being evacuated.
First lets find out what is so special about a traditional "vacuum pump".
Here is a more complete diagram of a traditional rotary vane pump used for vacuum service.
Illustrations of such machines abound in many books
relating the use of vacuum in
various scientific and industrial applications.
Those diagrams are often overly simplified and fail
to show the role that the oil plays in
the pump's operation.
Diagram that shows how the oil seals and lubricates
|The oil not only serves
to lubricate the
machine, but also forms the dynamic
seals that prevent the air from leaking around
the rotor, stator and the vanes of the pump.
Another important detail often left out
This valve prevent the oil from being
Also, if the space in front of the
The oil would have to be squeezed back
A precise amount of oil is feed into each rotation
| A separate oil pump that is driven from the main shaft
of the machine feeds
channels in the end plates that cover the
pump cavity pass the oil to the stator
and rotor parts.
Understanding of the physics of traditional "vacuum
pump" operation allowed the design
of a viable alternative. <---- Back to main page <-- Back to previous page Next page-->