(Summary description)
At present, there are two main types of screw air compressors on the market: single-stage compression and two-stage compression. Single-stage compression is familiar to everyone and widely used. In actual use, some air compressors with high power and high demand for gas production often use two-stage compression. This article briefly introduces the working principle and advantages of two-stage compression.


Two-stage compression is to combine the first-stage compression rotor and the second-stage compression rotor in a casing, and directly drive them through helical gears. The natural air enters the first stage of 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, which greatly reduces the temperature. The cooled compressed gas enters the second stage rotor, enters the second stage compression, and is compressed to the final exhaust pressure. Finally, the compressor is discharged through the exhaust flange to complete the compression process.

Because when the temperature is high, the density of the gas is low, and the more work is required for compression, so the isothermal compression of the air compressor during the compression process is the most labor-saving. Not only that, isothermal compression can not only reduce the power consumption, but also reduce the temperature of the compressed gas, making the operation of the air compressor more reliable. However, isothermal compression is impossible to achieve in practice, and step-by-step compression and intermediate cooling is an effective method to reduce the exhaust gas temperature.

Two pairs of rotors work at the same time, the pumping speed is fast, and the gas production is large, which is an irreplaceable advantage of single-stage compression. Moreover, due to the double-stage compression, the compression of each stage is much smaller than that of the single-stage compression, the compression of the rotor and the bearing is small, and the diameter of the rotor is large and the rotation speed is low, so the operation is more reliable.

• Categories:Principle
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• Time of issue:2017-09-27 08:39
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