Roots blowers

Roots blowers is named for the brothers Philander and Francis Marion Roots of Connersville, Indiana, who first patented the basic design.

Roots blowers features

A Roots blower is a positive displacement lobe compressor without internal compression. Once the compression chamber comes into contact with the outlet, compressed air flows back into the housing from the pressure side. Subsequently, further compression takes place when the volume of the compression chamber further decreases with continued rotation. Accordingly, compression takes place against full counter-pressure, which leads to low efficiency and a high noise level.

Roots blowers work by two contra rotating lobes in a housing, synchronized by means of a set of gear wheels. Roots blowers cannot achieve high pressures, they are usually air cooler, reliable and produce oil-free air. Low efficiency of roots blowers limits them to very low pressure applications and compression in a single stage, even if two- and three-stage versions are available. Roots blowers are frequently used as vacuum pumps and for pneumatic conveyance.