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About Rotary Screw Air Compressors

How Rotary Screw Air Compressors Work

    • C-Aire is North America's largest distributor of BOGE rotary screw, scroll, and variable speed air compressors.
    • A rotary screw compressor includes two intermeshing rotors in housing that have an inlet port at one end and a discharge port at the other end.
    • Most rotary screw units are single-stage.
    • Motors run continuously. The inlet port is closed when the desired PSI is achieved and opens again as needed.
    • Lubricant injected into the compression chamber serves three functions:
      • Lubricates the intermeshing rotors and bearings
      • Removes most of the heat
      • Acts as a seal in the clearances between the meshing rotors and housing
    • Air exiting the rotors passes through a sump/separator. Directional and velocity changes are used to separate most of the liquid.
    • The remaining aerosols in the air are separated by a coalescing filter, resulting in generally 2-5 parts per million of lubricant carryovers.
    • Lubricant (carrying much of the heat from air compressing) passes through the cooler before returning to the rotators.

Additional Notes

  • Rule of thumb: every 1 HP produces 4 CFM
  • Advantages:
    • Duty cycle can be 100% (80% minimum, designed for continuous use)
    • Quiet
    • Lower cost of compressed air (energy cost)
    • Complete package: air is cooled, filtered through a Coalescing Filter, vibration free
  • Disadvantages:
    • Higher initial cost
    • Requires professional maintenance
BE C7L-3208-125DT Boge Rotary Screw Compressor - C-Aire Compressors

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