Elmo Rietschle R-VWP 500/1000/1500/2500 - Manual (Page 14)

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Set up and operation
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4.1.1 Data plate
Fig. 4 Data plate
4.2 Description
Roots pumps are two shaft, rotary piston pumps, where two symmetrical rotary pistons are rotating in oppo-
site directions in a housing and are synchronised by a pair of toothed gears.
The pumping chamber of Roots pumps is oil free. The synchronised drive gears and the bearings for the
rotors are oil lubricated. The drive gears and the bearings are fi tted into the two end chambers which also
contain the oil tanks.
Both the end chambers are separated from the pumping chamber using labyrinth seals. Both oil tanks are
designed so that all rotational speeds, bearings and gears are supplied with the correct amount of oil.
An integral unloading valve (Fig. 5/C) gives the automatic facility to start the Roots pump at the same time as
the backing pump. Consequently when starting, an overload of the drive motor can be avoided.
The R-VWP has a protection mesh on the inlet.
High-vacuum connection (Fig. 2/A, 3/A 5/A) and pre-vacuum connection (Fig. 2/B, 3/B, 5/B) have fl anges
according to DIN 28 404 (R-VWP 500/ 1000/ 1500) or DIN 2501 (R-VWP 2500).
All the pumps are driven by a direct fl anged three phase, standard TEFV motor via a pin and bush coupling.
1 Type/ Size (mechanical version)
2 Serial number
3 Year of construction
4 Item no.
5 Pressure difference
6 Suction capacity
7 Speed
8 Motor rating