Roots blowers

Roots blowers

Engine systems

Published in Tom Denton, Automobile Mechanical and Electrical Systems, 2018

The Roots blower uses two or three lobe intermeshed rotors to pump air. The rotors have helical rotor vanes to reduce noise and improve efficiency. The rotor vanes are driven and matched together with a pair of gears, so that they rotate in mesh with each other. They run on ball or needle roller bearings at each end of the rotor spindles. They must be lubricated with high-performance grease or synthetic oil in the bearing cases.

Numerical study and experimental validation of a Roots blower with backflow design

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Journal Information

Published in Engineering Applications of Computational Fluid Mechanics, 2018

Shu-Kai Sun, Xiao-Han Jia, Lin-Fen Xing, Xue-Yuan Peng

The Roots blower is a type of gas transport machine comprising a pair of meshed but non-contacting rotors in the cylinder. The rotors rotate in opposite directions and are driven by two identical timing gears. The fluid is transferred from the inlet side to the outlet side when the rotors rotate as shown in Figure 1. Roots blowers are widely used in the pharmaceutical industry, chemical industry, and sewage treatment because of their high reliability, low cost and easy maintenance. Roots blowers can be applied to numerous devices such as middle-pressure blowers, low- and middle-vacuum pumps, and hydraulic pumps. In recent years, the Roots blowers were used in mechanical vapour recompression systems to increase the pressure and temperature of the vapour and to recycle hydrogen as well as supply the compressed air in hydrogen fuel cells.

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Engine systems

Numerical study and experimental validation of a Roots blower with backflow design