Rotary vane compressors are used in remediation applications requiring relatively low pressures, such as air sparging. Rotary vane technology is similar to liquid ring technology in that the impeller is mounted eccentrically relative to the casing, enabling internal compression. The difference lies in the mechanics, rather than creating a seal with a fluid, the vanes create the seal. The vanes of a rotary vane compressor are mounted in a slot which allows them to slide in and out to match the eccentric distance from the center of the impeller to the casing. The vanes are made of carbon-fiber resulting in low-friction operation and easy replacement upon wear. As a vane passes the compressor inlet, the distance from the tip of the vane to the center of the impeller is increasing, resulting in an expanding chamber. The expansion of the chamber causes air to be drawn into the compressor. As the vane rotates, the chamber reaches its maximum expansion and then begins to contract which results in the compression of the air. The compression continues until the outlet of the compressor is reached, and the air is discharged.
Rotary vane compressors are capable of pressures up to 30 PSIG. Contact between the vanes and casing does produce wear, leading to higher maintenance requirements than non-contact compressors. The dry compression of rotary vane compressors also leads to high noise levels and high discharge temperatures.
When selecting a rotary vane compressor, the required flow rate and pressure are the most important factors, and the electrical classification of the motor should also be considered.
MLE Equipment uses rotary vane compressors manufactured by Elmo Rietschle and Becker Pumps. Please see the provided specification sheets and manuals for more detailed information on rotary vane compressors.
