Roots, Universal rai rotary positive blowers, Operating principle – CAMCORP Blower Package with Roots Blower User Manual
Page 21: Outline drawing & dimensional table, Basic blower description
S P E C I F I C A T I O N S
S-12K84
OPERATING PRINCIPLE
ROOTS
TM
Universal RAI
Rotary Positive Blowers
Frames 22 thru 718
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 gas casing.
BASIC BLOWER DESCRIPTION
Universal RAI blowers are heavy duty
rotary blowers designed with detachable
rugged steel mounting feet, which permit easy
in-field adaptability to either ver tical or
horizontal installation requirements.
Because of the detachable mounting
feet, these units can 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 antifriction
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.
POSITION 1
POSITION 2
POSITION 3
POSITION 4
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