What is a screw compressor?

A screw compressor is a type of rotary compressor which compresses air due to screw action. The main advantage of using this compressor is that it can supply compresses air continuously with minimum fluctuation in delivery pressure. It is usually applied for low-pressure applications up to 8 bars.

What is a rotary screw air compressor?

An air compressor with a rotary-type positive mechanism is known as a rotary screw air compressor. Wherever there is a requirement for significant amounts of high-pressure air, screw compressors are frequently used. A screw compressor is the best option if your application requires constant air demand.

What are asymmetric screw compressors?

The first twin screw compressors had asymmetric rotor profile and did not use any cooling liquid inside the compression chamber. These were called oil-free or dry screw compressors. Modern, high-speed, oil-free screw compressors have asymmetric screw profiles, resulting in significantly improved energy efficiency, due to reduced internal leakage.

What is a liquid injected screw compressor?

In liquid-injected screw compressors, a liquid is injected into the compression chamber and often into the compressor bearings. Its function is to cool and lubricate the compressor element’s moving parts, to cool the air being compressed internally, and to reduce the return leakage to the inlet.

Why do oil-free compressors have asymmetric screw profiles?

Modern, high-speed, oil-free screw compressors have asymmetric screw profiles, resulting in significantly improved energy efficiency, due to reduced internal leakage. External gears are most often used to synchronize the position of the counter-rotating rotors.

What is a rotor in a screw compressor?

Rotors are forged from normal carbon steel and must dynamically balance after machining. Sleeve bearings are used as shaft seals within the compressor. In a screw compressor one of the shafts is driving shaft and the other is driven shaft.