The compression process of two-stage screw air compressoris is that natural air enters the first stage compression through the air filter, mixes with a small amount of lubricating oil in the compression chamber, and compresses the mixed gas to the interstage pressure. The compressed gas enters the cooling channel and comes into contact with a large amount of oil mist, thereby greatly reducing the temperature. The cooled compressed gas enters the second-stage rotor, undergoes two-stage compression, and is compressed to the final exhaust pressure. The compressor is discharged through the exhaust flange to complete the entire compression process. Compared with single-stage compression, two-stage screw air compressors tend to be energy-saving isothermal compression. In principle, two-stage screw air compressors can save energy by 5-8% compared with single-stage compression. Reduce internal leakage, improve volumetric efficiency; reduce bearing load, increase bearing life, and extend the life of the main engine.

Since the two-stage screw air compressor is a general-purpose machine with high energy consumption, for users with large air consumption and long-term continuous operation, the energy-saving two-stage screw air compressor should be given priority.