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Air purity is critical for many applications, in which even the smallest drop of oil or the air polluted by oil may lead to product deterioration, product recall or damage to production equipment.
Rotary screw compressor is a positive displacement compressor. The compression principle of oil-free rotary screw compressor is similar to that of oil injection type compressor, but oil is not introduced into the compressor chamber. There are two different types - the dry type and the water lubricated type.
In the dry type oil-free rotary screw compressors, the intermeshing rotors do not touch and their relative positions are maintained through lubricated timing gears outside the compression chamber. In the water injected type, similar timing gear construction is used, but water is injected into the compression chamber to act as a seal in internal clearances, and to remove the heat of compression.
Working Pressure:5-10 bar 72-145 psig
Working Power:55-355 kw 75-470 hp
Air delivery:7.8 - 72 m3/min 275 - 2542 cfm
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Oil-free rotary screw compressors utilize oil for lubrication of bearings and gears, which are isolated from the compression chamber. The lubricating oil, therefore, does not cause compressed air contamination.
Working Pressure:7-12.5 bar 100-181 psig
Working Power:18.5-250 kw 25-330 hp
Air Delivery:2.3-43 m3/min 81.2-1518.3 cfm
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