The Rotary Screw Compressor: What It Is and How It Works

The screw compressor, also known as a rotary screw compressor, is a particular type of compressor that belongs to the volumetric family and is used to compress air and gases. Its origins date back to the 1930s and it consists of two key elements: the female rotor and the male rotor which, rotating in opposite directions to each other, reduce the space between them and the housing. The rotary screw compressor operates at high speeds and guarantees a high energy flow rate despite its compact size. Its efficiency is measured based on the pre-set compression ratio and the required operating pressure.

Among the various types of rotary screw compressors is the oil-free compressor, also known as a “dry” compressor, equipped with asymmetrical profile screws that reduce internal losses. Lubrication is not necessary because external gears are used to synchronize the parts and, due to their shape, the rotors do not even come into contact with the parts of the housing. Oil-free screw compressors are therefore compressors without lubricating oils in the gas compression section, which is why each component must be designed with extreme precision. To increase performance when higher pressures are required, these compressors are designed with multiple stages and an interstage cooling system.

Sale of oil-free screw compressors Riem Italy

Riem Italy is the Italian distributor of Gardner Denver and Ceccato oil-free screw compressors, leading manufacturers of rotary compressors. For more information, read: Sale of new screw compressors. In addition to selling rotary compressors, Riem Italy also overhauls oil-free screw units thanks to a professional and highly experienced team and workshops specializing in compressor servicing, capable of reconditioning screw units to “zero” hours. Read also: Oil-Free Screw Unit Overhaul