The screw compressor: what it is and how it works?

The screw compressor, also called rotary screw compressor, is a particular type of compressor that belongs to the volumetric family and is used for compressing air and gases. Its origins date back to the 1930s and it is composed of two pivotal elements: the female rotor and the male rotor which, by rotating in the opposite direction to each other, decrease the space between them and the housing. The rotary screw compressor works at high speed and guarantees big airflow despite having small dimensions. Its efficiency is measured on the basis of the predetermined compression ratio and the required operating pressure. 

Among the various types of rotary screw compressors, there is the oil-free one, also called “dry”, equipped with screws with asymmetrical profiles capable of reducing internal losses. Lubrication is not necessary precisely because external gears are used for the synchronization of the parts and, because of their shape, the rotors do not touch each other or even the walls of the housing. Oil-Free screw compressors are therefore compressors without lubricating oils in the area dedicated to gas compression, and for this reason each component must be designed with extreme precision. To increase performance, i.e. when higher pressures are required, these compressors are designed with multiple stages and an interstage cooling system. 

The sale of oil-free compressors by Riem Italy 

Riem Italy is the distributor in Italy of oil-free screw compressors brands Gardner Denver and Ceccato that are leading companies in the production of rotary compressors. For further information read: New Screw Compressors Sale.

In addition to the sale of rotary compressors, Riem Italy also deals with the overhaul to “zero” hours of oil-free screw machines thanks to a professional and highly experienced team and workshops specialized in compressor assistance. Read also: Oil Free Screw Groups Production