Description
chamber volume and the rotational speed of the pump,
but also on the pressure differential between the
discharge and intake flanges (see Fig. 7).
1.1.2 Design
RUVAC Roots pumps can pump gas in the vertical or
horizontal direction.
Although the pumping chamber of Roots pumps is free
of sealing agents and lubricants, the two gearwheels of
the synchromesh gearing (3/1) and the bearings (3/2) for
the impeller shafts are lubricated with oil. The
gearwheels and bearings of the RUVAC are located in
two side chambers which also contain the oil supply.
These two side chambers are separated from the
pumping chamber by the impeller seals (3/3). During
operation of the pump, the side chambers are evacuated
via the impeller seals.
The bearing chambers are linked to each other by two
passages (3/13). These passages are arranged so that
for either horizontal or vertical flow the pressure will be
equalised between the oil supplies.
In both bearing chambers there are integrated oil pumps
to ensure that the bearings and gearwheels receive
sufficient lubricant at all recommended speeds.
The motor of the RUVAC WA/WAU is directly flanged to
the coupling housing. One shaft of the pump is linked to
the shaft of the motor by an elastic coupling (3/8). The
shaft of the other impeller is driven via the synchromesh
gear.
With the standard motors, the RUVAC WA/WAUs can run
on either 50 Hz or 60 Hz power supplies.
The speed is then increased to 3,600 rpm and the
pumping speed increases correspondingly.
For the permissible electrical connection data with
respect to these frequencies, see Section 1.3.
Motors for operation in connection with special supply
voltages or frequencies as well as explosion hazard
protected motors are available upon request.
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Fig. 3 Longitudinal section of a RUVAC WAU 2001 (vertical flow)
Key to Fig. 3
1 Gearwheels
8 Coupling
2 Bearings
9 Motor
3 Impeller seals
10 Drive shaft
4 Intake port
11 Centrifugal disc lubricator
5 Impellers
12 Discharge port
6 Shaft seals
13 Connecting pipes
7 Oiler
14 Crane eye
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