Exploring Air Compressors: Rotary Screw
This post continues our series “Exploring Air Compressors”. In part one, we discussed the mechanics, applications, and common models of reciprocating piston compressors. Now, we will explore these same questions in regards to the very common rotary screw compressor model.
Rotary Screw
How does a rotary screw compressor work?
A rotary screw compressor uses two rotors for air compression. The specially designed shape of the rotors minimizes the in-between space as the two rotate into each other. The rotors trap the air in the small void and slowly push it to the other side as the rotors circulate into each other.
The air must pass by an inlet port, known as the airend, where oil is injected into the rotors. Once added to the rotors, the air’s space becomes even smaller, increasing the pressure and compression further. While this oil is important for lubrication, sealing air pockets, and absorbing heat, it does have to be drained before the compressed air can travel into the system.
Because of this setup, most rotary screw compressors come standard with an oil removal filter or an oil separator cartridge as part of the compressor package. Keeping these filters in good working order ensures proper air compression and maintains the rest of the system. Regular service includes the periodic replacement of this crucial element.
What applications should use this model?
Rotary Screw compressors have quickly become the standard for generating large amounts of compressed air. Whether you are sandblasting or operating multiple machines in one plant, a rotary screw would work best. Not only are they compatible with a variety of applications, but they also match with a variety of control methods to ensure load efficiency. A process’s specific needs will determine which model to use.
What rotary screw compressors are available?
Common rotary screw compressor sizes range from 25 HP to 300 HP with a variety of flow rates. Models are available, however, as small as 3 HP and as large as 700 HP. There are many varieties to consider, however. CASCO USA carries Kaeser’s entire line of Rotary Screw Compressors and Oil-Free Compressors. For a more detailed explanation of available models, speak with a representative.
To explore more air compressor types, visit our Compressed Air 101: Types of Compressors page.
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