Screw Drive Air Compressor

Working principle of screw drive air compressor

The screw drive air compressor uses the rotation of a pair of precisely meshed spiral yin and yang rotors to achieve gas compression. There are mainly four working processes:

1. Inhalation stage
After being purified by the filter, the air is sucked into the compression chamber through the intake valve. When the screw rotor rotates, the tooth groove space is connected to the air inlet, and the outside air is sucked into the tooth groove under the action of negative pressure.

2. Closure and compression
The screw rotor continues to rotate, and after the tooth groove is separated from the air inlet, the tooth groove space is closed, forming a closed chamber composed of the rotor, tooth groove and casing. As the yin and yang rotors continue to mesh and rotate, the chamber volume gradually decreases, the gas is squeezed, and the pressure and temperature rise accordingly. The lubricating oil is sprayed into the chamber through the pressure difference, which plays a major role.

3. Exhaust process
When the compression chamber rotates to connect with the exhaust port, and the gas pressure in the chamber reaches the set value, the compressed oil-gas mixture is discharged from the air compressor through the exhaust port.

4. Oil-gas separation and circulation
The discharged high-temperature oil-gas mixture enters the oil-gas separator, and the compressed air flows upward, passes through the separation filter element to remove most of the suspended oil droplets, and becomes a cleaner compressed gas. The separated compressed gas flows through the minimum pressure valve, and is output for use after cooling in the aftercooler. The settled lubricating oil flows through the pipeline and the oil cooler for heat dissipation.


Composition of screw drive air compressor
1. Screw rotor
The male rotor is driven by the motor to drive the female rotor to rotate synchronously in the opposite direction. The rotor length determines the exhaust pressure, and the diameter affects the exhaust flow rate.

2. Valveless structure
The suction and exhaust are automatically controlled by the rotor phase, with a simple structure and smooth operation.

3. Lubrication system
The lubricating oil circulation system includes a separator, a cooler, and a filter.

4. Control system
Generally equipped with variable frequency speed regulation and intelligent monitoring system, the speed is automatically adjusted according to the gas demand, saving energy.

Airfler's independently developed variable frequency screw air compressor saves 35% energy compared to traditional air compressor models, has stable operation, and a warranty period of up to 2 years. It is widely used in industries such as textiles, electronic processing, food production, and mining.