1. Cooling: The injected oil is in droplet shape and mixed with the compressed gas, so that the great heat exchange surface quickly absorbs the compression heat of the gas, which cools the compressed medium and greatly reduces the exhaust temperature.
2. Lubrication: In the dry oil-free screw air compressor, the two rotors are not in contact with each other, and the gap is maintained by the high-precision synchronous gear. In the oil injection screw air compressor, because there is a large amount of lubricating oil, and the female rotor only absorbs a small part of the total compression work, the synchronous gear can be omitted, so that the male rotor can directly drive the female rotor. In addition, because the injected oil is exactly the same as the lubricating oil used in the bearing, it is no longer necessary to use a complex sealing device to separate the gas from the lubricating oil, which makes the distance between the rotor supporting bearings smaller, significantly improving the stiffness of the rotor and reducing the deformation.
3. Sealing: There are many leakage channels in the screw air compressor, which are long and narrow gaps. The existence of oil greatly enhances the sealing effect and greatly reduces the leakage through them.
4. Noise reduction: The injected oil is a viscous fluid, which can absorb and damp acoustic energy and sound waves. Generally, the noise can be reduced by 10~ 20 decibels after oil injection.
