Mattei Compressor Advantages

The relationship between the effective air delivery and the geometric volume is the volumetric efficiency which is affected in the rotor stator unit by the air leakage from the area under pressure towards the intake. It is important that these leakages are kept to an absolute minimum, because the energy required to compress the air which returns to the intake, is a loss. The smaller the internal leakage, the more the volumetric efficiency increases and the required power per measuring unit of delivered air is reduced (specific energy, i.e. kW/100 cfm).

Mattei’s rotary vane RSU is not subject to thrust forces and remains balanced under load as pressure is equalized along the length of the rotor. Mechanical efficiency remains high (~90%) as there is near-perfect sealing. The oil simply services the shaft bushings and provides lubrication for the blades. The efficiency is linear across the functional speed range, which makes the kw/100 cfm ratings of OPTIMA and MAXIMA truly class leaders. In comparison, rotor screw airends are supported by roller and thrust bearings and generally one rotor drives the other by means of the helical profiles. Sometimes, they are driven by a pair of external gears. During rotation the screw profiles uncover an intake orifice at one end of the stator, through which the air enters and fills the volume between the meshing screws. On the opposite end the meshing screws discharge pressurized air through a discharge port. During the process, some gas bubbles rise through the oil to escape along the blow-hole path seeking the lower differential pressure across the length of the screws. This results in loss of efficiency that becomes magnified as the speed varies above or below the ideal design range of each airend.