What is a Roots Blower Compressor?
A roots blower compressor consists of two rotors with lobes rotating in an air-tight casing that has inlet and outlet ports. Its action resembles that of a gear pump. There are many designs of wheels, but they generally have two or three lobes (and sometimes even more). In all cases, their action remains the same.
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The lobes are so designed that they provide an air-tight joint at the point of their contact. The mechanical energy is provided to one of the rotors from some external source, while the other is gear-driven from the first. As the rotors rotate, the air at atmospheric pressure, is trapped in the pockets formed between the lobes and casing.
The rotary motion of the lobes delivers the entrapped air into the receiver. Thus, more and more flow of air into the receiver increases its pressure. Finally, the air at a higher pressure is delivered from the receiver.