The main reasons why screw air compressors need oil are as follows:

1.Lubrication: The main engine of the screw air compressor is a pair of rotors that mesh with each other, and the lubricating oil can form a layer of oil film on the surface of the rotor to reduce the friction and wear between the rotors.

2.Cooling: A large amount of heat is generated during the compressed air process, and the lubricating oil is able to absorb and take away this heat to prevent the air compressor from overheating.

3.Sealing: The lubricating oil forms a seal between the rotor and the casing, improving compression efficiency and reducing internal leakage.

4.Cleaning & Filtration: Lubricants trap contaminants and impurities in the intake air, protecting internal components from contamination.

5.Noise reduction: Lubricating oil can reduce the noise of the air compressor during operation, and reduce noise by acting as a noise barrier.

6.Kinetic energy transfer: In some compressor designs, lubricating oil is also used to transfer energy, such as hydraulic systems and remote control motors.

7.Stress Dispersion Cushioning: Lubricating oil can distribute the load and cushion the impact, and play a role in shock absorption.

Therefore, the oil of the screw air compressor is essential to keep the machine running properly and prolong its service life.