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.
- Rule of thumb: every 1 HP produces 4 CFM
- Duty cycle can be 100% (80% minimum, designed for continuous use)
- Lower cost of compressed air (energy cost)
- Complete package: air is cooled, filtered through a Coalescing Filter, vibration free
- Higher initial cost
- Requires professional maintenance
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