The Operation about Rotary Screw Compressor and its Application

Rotary screw compressor is a form of air compressor. It is larger, more complex and more expensive than the models kept by most private workshops. In most cases, it is a non-portable unit used to supply compressed air for many industrial purposes. Rotary screw compressors use two meshing helical screws, known as rotors, to compress the gas. In a dry running rotary screw compressor, timing gears ensure that the male and female rotors maintain precise alignment. In an oil-flooded rotary screw compressor, lubricating oil bridges the space between the rotors, both providing a hydraulic seal and transferring mechanical energy between the driving and driven rotor. Gas enters at the suction side and moves through the threads as the screws rotate. The meshing rotors force the gas through the compressor, and the gas exits at the end of the screws.

Typically, they are used to supply compressed air for general industrial applications. Trailer mounted diesel powered units are often seen at construction sites, and are used to power air operated construction machinery. In an oil-free compressor, the air is compressed entirely through the action of the screws, without the assistance of an oil seal. Oil-free compressors are used in applications where entrained oil carry-over is not acceptable, such as medical research and semiconductor manufacturing. On the other hand, in an oil-flooded rotary screw compressors, oil is injected into the compression cavities to aid sealing and provide cooling sink for the gas charge. It is usual for some entrained compressor oil to carry over into the compressed gas stream downstream of the compressor. In many applications, this is rectified by coalescer/filter vessels.

The Applications of Rotary Screw Compressors

       The gas compressor is a mechanical device that increases the pressure of a gas by reducing its volume. Similar to pumps, gas compressor increases the pressure on a fluid and transports the fluid through a pipe. The rotary screw compressors are the type of gas compressor which uses a rotary type positive displacement mechanism. They are commonly used to replace piston compressors where large volumes of high pressure air are needed, either for large industrial applications or to operate high-power air tools such as jackhammers.
       Basically, the screw compressors are used to supply compressed air for general industrial applications. Trailer mounted diesel powered units are often seen at construction sites, and are used to power air operated construction machinery.
       For Oil-free compressor, the air is compressed entirely through the action of the screws, without the assistance of an oil seal. They are used in applications where entrained oil carry-over is not acceptable, such as medical research and semiconductor manufacturing.
       In an Oil-flooded rotary screw compressor, oil is injected into the compression cavities to aid sealing and provide cooling sink for the gas charge. It is usual for some entrained compressor oil to carry over into the compressed gas stream downstream of the compressor. In many applications, this is rectified by coalescer/filter vessels.