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S-30S03 rev.0508

BASIC BLOWER DESCRIPTION

ROOTS

™

Patented Universal RAI-J

WHISPAIR

Dual

Splash Lubricated (DSL) blowers are heavy duty rotary

units in a compact, sturdy design, engineered for

continuous service when operated within speed and

vacuum/pressure ratings.

The basic model features a cast iron casing with a

computer-designed cast relief for noise and shock

suppression. Carburized and ground alloy steel spur

timing gears are secured to steel shafts with a taper

mounting and locknut. The unit features cast iron

involute impellers. Oversized anti-friction bearings are

used, with a cylindrical roller bearing at the drive shaft to

withstand V-belt pull. Detachable rugged steel mounting

feet permit easy in-field adaptablility to either vertical or

horizontal installation requirements.

The Universal RAI-J

DSL design incorporates dual

splash lubrication to the gear AND drive ends. Roots’

exclusive “figure-eight” gearbox design improves oil

distribution to maximize bearing and gear life. Sight

glasses (3/8”) are provided for accurate oil level

confirmation.

LOWER AIR PULSATION

Patented WHISPAIR

blowers operate with up to 40%

less pressure pulsation than conventional blowers, due

to the pressure equalizing effect of the WHISPAIR

SPECIFICATIONS

ROOTS

™

Universal RAI-J

™

DSL (Dual Splash Lubricated)

Rotary Positive Displacement Blowers

Frames 33J thru 56J

blower jet design.

In conventional blowers, as the impeller opens up to

the outlet port, the higher pressure air in the discharge

line rapidly expands into the lower pressure pocket

formed by the impeller and the blower case. The result-

ing shock wave strikes the advancing surface of the

impeller at near-sonic velocity. Four pressure pulses

occur during each revolution, transmitting shock loads

to the gear and bearings.

LONGER BEARING LIFE

The pre-pressurization of the low pressure pocket

through the WHISPAIR

blower jet cavity smooths the

pulsations, resulting in less shock being transmitted

through the impellers to the bearings, providing longer

bearing life.

LOWER VIBRATION

The reduction in the magnitude of the pressure pulsation

results in smoother operation.

LOWER NOISE

The pressure pulses, inherent in the rotary-lobe design,

are also the major source of blower noise. The rapid

backflow of air into the blower from the discharge line,

four times per revolution, results in high noise levels in

a conventional blower. The WHISPAIR

jet design

controls the backflow of air into the blower, reducing

noise by approximately 5 dBA vaccum, 3 dB pressure.

Summary of content (2 pages)

PAGE 1
SPECIFICATIONS ROOTS™ Universal RAI-J™ DSL (Dual Splash Lubricated) Rotary Positive Displacement Blowers Frames 33J thru 56J BASIC BLOWER DESCRIPTION ROOTS™ Patented Universal RAI-JTM WHISPAIRTM Dual Splash Lubricated (DSL) blowers are heavy duty rotary units in a compact, sturdy design, engineered for continuous service when operated within speed and vacuum/pressure ratings. The basic model features a cast iron casing with a computer-designed cast relief for noise and shock suppression.
PAGE 2
PERFORMANCE TABLE 1 PSI Frame Speed Size RPM CFM BHP 0.3 1160 55 33 2800 156 0.9 3600 205 1.2 0.5 1160 95 36 2800 262 1.5 3600 344 2.1 0.5 79 860 45 1760 188 1.0 3600 410 2.7 860 105 0.6 47 1760 249 1.3 3600 542 3.5 700 123 0.7 56 1760 358 2.0 2850 598 4.0 NOTES: 6 PSI CFM BHP 31 1.9 132 4.6 181 6.1 61 3.1 229 7.7 310 10.1 42 2.7 151 5.7 374 12.2 59 3.6 203 7.5 496 16.1 78 4.1 312 10.5 553 17.7 7 PSI BHP 2.2 5.4 7.0 3.6 8.9 11.7 3.2 6.6 14.1 4.2 8.7 18.6 4.7 12.2 20.