How does Screw Air Compressor work?

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Let us begin by looking at the rotary screw air compressor part. The element is made up of two helix-shaped rotors, each having a distinct shape and number of ‘grooves’/’teeth’ (usually one with 4 and one with 6 teeth). Simply described, ambient air is drawn into this screw element, and the air is compressed as it travels along with the rotors.

The screw element (block) is made up of two rotors that look like a helix and have a big climb with a variable number of teeth on each side. Teeth are normally arranged in a 4:6 ratio. As the air moves along the rotors, the volume gap between the rotor teeth shrinks in the direction from the suction to the exit, compressing the air.

Lubricated screw air compressors with oil injection are the most common form of screw compressor. However, Non-lubricated compressors are utilized for delicate procedures involving compressed air quality. In the case of a lubricated compressor, the compression process is as follows:

The basis of operation of a lubricated screw compressor

The air circuit consists of

The air is taken into the compressor element and compressed through the filter and an open intake valve. A check valve allows compressed air and oil to pass into the air receiver/oil separator.

The air is expelled via an output valve, a minimum pressure valve, and an air chiller during unloaded operation. An incorporated check valve prevents the compressed air downstream the valve from being vented into the atmosphere.

The oil circuit is as follows

The majority of the oil is extracted from the air/oil mixture by centrifugal action in the air receiver/oil separator. Furthermore, the oil separator removes the residual oil. As a matter of fact, the oil is collected in the oil tank at the bottom of the air receiver/oil separator. A thermostatic bypass valve is installed in the oil system.

The bypass valve turns off the supply to the oil cooler and bypasses it when the oil temperature falls below the set point. The oil from the air receiver/oil separator is forced into the compressor element by air pressure, which passes through the oil filter and oil stop valve.

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