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Fig. 3.32: The compression process in a screw compressor stage | The intake air is compressed to final pressure in chambers which continuously decrease in size through the rotation of the screw rotors. When the final pressure is reached the air is forced out through the discharge outlet. The compression chambers are formed by the casing walls and the meshing helical profiles of the rotors.
Intake ( 1 )
The air enters through the inlet aperture into the open screw profiles of the rotors on the intake side.
Compression ( 2 ) + ( 3 )
The air inlet aperture is closed by the continued rotation of the rotors, the volume reduces and the pressure increases.
Oil is injected during this process.
Discharge ( 4 )
The compression process is completed. The final pressure is reached and the discharge begins. |