Roots Blowers

Dresser ROOTS Positive Displacement Line of Blowers
Roots Blower Horizontal Configuration	Roots Blower Vertical Configuration
Roots Blowers - Dimensional Specifications \| Performance Table \| IO&M Manual Performance Curves: ALL, 22, 24, 32, 33, 36, 42, 45, 47, 53, 56, 59, 65, 68, 76, 615, 711, 718
General The Dresser Roots Universal RAI blowers are heavy duty rotary blowers designed with detachable rugged steel mounting feet, which permit easy infield adaptability to either vertical or horizontal installation requirements. The Universal RAI blowers can even be hung from overhead supports. Detachable mounting feet allow these units to be easily adapted to any of four drive shaft positions; right hand, left hand, bottom or top. The compact, sturdy design is engineered for continuous service when operated in accordance with speed and pressure ratings. The basic model consists of a cast iron casing, carburized and ground alloy steel spur timing gears secured to steel shafts with a taper mounting and locknut, and cast iron involute impellers. Oversized anti-friction bearings are used, with a cylindrical roller bearing at the drive shaft to withstand V-belt pull. The Universal RAI features thrust control, with splash oil lube on the gear end and grease lube on the drive end. After standard tests, the unit is sprayed with a protective paint and boxed or placed on skids. Available accessories include driver, relief valve, inlet and discharge silencer, inlet filter, check valve, extended base, V-belt or flexible coupling and drive guards. Features: Detachable steel mounting feet Rigid one-piece cast iron casing Anti-friction bearings Thrust control Splash-lubricated spur timing gears Connections in standard pipe sizes Straight, precision machined two-lobe impellers Ground steel shafts
OPERATING PRINCIPLE Two figure-eight lobe impellers mounted on parallel shafts rotate in opposite directions. As each impeller passes the blower inlet, it traps a definite volume of air and carries it around the case to the blower outlet, where the air is discharged. With constant speed operation, the displaced volume is essentially the same regardless of pressure, temperature or barometric pressure. Timing gears control the relative position of the impellers to each other and maintain small but definite clearances. This allows operation without lubrication being required inside the air casing.