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ROOTS ROTARY POSITIVE DISPLACEMENT PRINCIPLE
The schematic below shows the operation of a rotary positive blower. The basic unit consists of two figure eight shaped impellers mounted on parallel shafts.
These impellers rotate in opposite directions within an elongated cylindrical housing. As each impeller passes the inlet, it traps a definite volume of air and carries it around the casing to the discharge, where it is expelled. The cycle repeats four times with every revolution.
All rotary positive blowers have close tolerances between the impellers, headplates and casing to minimize back slippage of air and to improve efficiency.
ROOTS WHISPAIR BLOWER PRINCIPLE
The Whispair blower operates on the same basic principle as all other rotary positive displacement blowers with one important advantage. Units with the Whispair design offer reduced pulsation, operating noise, and power loss by utilizing an exclusive wrap-around plenum to control pressure equalization. Whispair blowers (shown below) have a proprietary jet to feed back-flow in the direction of impeller movement, aiding and lowering power requirements.
Incoming air is trapped by the impellers and moved through the machines as in the basic rotary positive displacement principle. As pressure builds against the wrap-around plenum due to system resistance, the Whispair blower jet equalizes the pressure between the trapped air and the discharge area. This action reduces shock and feeds the back-flow in the direction of rotation.
As the impeller completes its cycle, it discharges the trapped air, which now has the same pressure as the discharge line. Back-flow is controlled, resulting in reduced pulsation compared to the conventional blower. This improves efficiency, reduces noise level, and increases bearing and gear life.
MODEL FEATURES TABLE
|
Model
|
Reversible
Rotation |
Removable
Mounting
Feet |
Whispair
Design |
Water
Sealed
Unit |
|
Universal RAI blower |
X |
X |
|
|
|
Universal RAI-J blower |
|
X |
X |
|
|
RAM blower |
X |
X |
|
|
|
RAM-J blower |
|
X |
X |
X |
|
RAM-J vacuum pump |
|
X |
X |
|
|
RAM-J dry vacuum pump |
|
X |
|
|
|
RAM-J gas pump |
|
X |
X |
|
|
DVJ dry vacuum pump |
|
X |
X |
|
|
RAM-J high pressure pump |
|
X |
X |
|
|
RCS blower |
X |
X |
|
|
|
RCS-J blower |
|
700 frames only |
X |
|
|
RAS-J blower |
|
|
X |
|
|
RGS-J gas blower |
|
|
X |
|
|
