Two-Stage Screw Air Compressor
By employing two-stage compression, an intermediate cooler can be introduced between the stages. This allows the compressed gas, after the initial compression stage, to undergo isobaric cooling, reducing its temperature before entering the subsequent cylinder. Lower temperature and increased density facilitate further compression, resulting in significant power savings compared to single-stage compression. Consequently, the work area under two-stage compression at the same pressure is smaller than that of single-stage compression.
Principle of Two-Stage Screw Air Compressor
The principle of the wholesale two stage screw air compressorinvolves a natural air intake through an air filter into the first compression stage. In this stage, the incoming air mixes with a small amount of lubricating oil and is compressed to an intermediate pressure. The compressed gas then enters a cooling channel where it comes into contact with a significant amount of oil mist, effectively reducing its temperature. After cooling, the compressed gas enters the second rotor for the second compression stage, resulting in the gas being compressed to the final discharge pressure. Finally, the compressed gas is discharged through an exhaust flange, completing the entire compression process. While various designs exist, the fundamental principles are similar.
How to Differentiate Between Single-Stage, Two-Stage, and Multi-Stage Compressors
Distinguishing Between Single-Stage and 2 stage screw compressorBased on Machine Structure.
A single-stage air compressor consists of a pair of rotors that make up a rotary screw compressor, achieving air compression in a single step.
A two stage screw compressorconsists of two pairs of rotors. After the gas undergoes the first stage of compression, it enters the second stage for further compression. The compression ratio is higher, and the power is reduced compared to a single-stage compressor.
By splitting the compression process into two stages and setting inter-stage pressure using equal pressure ratios, the compression ratio for each stage is significantly lower than that of a single-stage compressor. This results in a substantial reduction in rotor backflow leakage, leading to improved volumetric and adiabatic efficiencies, consequently increasing the final gas output.
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