DRESSER Roots
DRESSER Roots URAI Blower
Universal RAI® blowers are heavy duty rotary blowers designed with detachable rugged steel mounting feet, which permit easy in field adaptability to either vertical or horizontal installation requirements.
Features
* Detachable steel mounting feet
* Rigid one-piece cast iron casing
* Anti-friction bearings
* Thrust Control; Splash oil 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 finite 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 defined, clearances. This allows operation without lubrication being required inside the air casing.
