Pressure Increase by Volume Reduction
Rotary vane vacuum pumps and compressors operate by compressing volume in
order to increase pressure and create vacuum.
- Suitable for pressure and/or vacuum
- Oil-less
- Wetted parts out of gray cast iron, carbon, stainless steel and
plastic
- Self-lubricating and self-adjusting vanes
- Good controllability
- Nearly pulsation free
- Compact design
- DC models with reversible operation
- Flow rates up to 21 cfm (595 l/min), pressure up to 14.5 psi (1.0
bar), vacuum up to 26 in.Hg (-880 mbar rel.)
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Technical Overview - Rotary Vane
In a cylindrical housing, the rotor is positioned eccentrically
on the shaft so the rotor is positioned near the top of
the cylinder. Rotor blades are positioned into numerous rotor slots.
When the rotor starts turning, centrifugal force causes the blades
to be thrown out and slide against the internal surface of the
cylinder. A cell is formed between two blades with a volume that
changes constantly during rotation. Air enters from the inlet port
into a cell until the rear blade reaches the inlet port, at this
point the cell has achieved its maximum air volume.
As the cell then moves away from the port, its volume becomes
smaller and smaller. The air is compressed and the pressure rises.
This continues until the pressure in the cell exceeds that in the
pressure chamber. The air then exits through the outlet port. Some
models are fitted with exhaust valves that stop the backflow of this
discharged air, if the maximum pressure has been reached. In a
vacuum pump the process is similar, but the cell gives decreasing
pressure and the chamber is at atmospheric pressure.
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