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Pumps and Compressors

Marc Borremans
Marc Borremans
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ASME Press
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The roots compressor (Figures 8.1 and 8.2) is composed of two rotors in the form of a figure of eight that rotate in opposite directions in a housing in the form of a flattened cylinder. While rotating, at first a gas is aspired out of the suction line, then locked up in the space between the rotor and housing and then transported to the discharge side, where it is displaced. During the transporting in the compressor the gas is not compressed, there is no internal compression like this, as is the case with a piston compressor andmany other displacement compressors. At themoment the rotor head rotates along the edge of the discharge port compressed gas flows back from the discharge pipe.Then the transported gas is displaced against the discharge pressure to the discharge side.

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