Elmo Rietschle S-VSI 300(42) - Manual (Page 14)

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4.2 Description
The S-VSI model range has a connecting thread on the suction side and an exhaust silencer with connecting
thread on the pressure side.
The TWISTER S-VSI is a double shaft screw vacuum pump in which two parallel screw rotors roll off against
each other without touching and dry. The gas to be fed in is here enclosed in the pump’s suction chamber
and compressed by the rotary movement of the screw rotors in the direction of the outlet. The gas sucked
in is gradually compressed to atmospheric pressure. The counter-rotating screw rotors are synchronised by
a gear pair in the gearbox. The synchronous gearbox gear wheels and the bearings are lubricated with oil.
These components are in a gearbox that also contains the oil supply. Oil conveying devices always ensure
that the bearings and the gear wheels are suffi ciently supplied with oil at all permissible speeds.
The gearbox and the compression chamber are separated from each other by special seals. The gearbox is
sealed from the outside with shaft seals and O rings, the compressor chamber with piston rings. Between
the two there is also another atmospherically ventilated area that can be loaded with sealing gas (special
version).
The TWISTER S-VSI is driven by standard fl anged three phase motors via a coupling (with an elastomer
component).
4.1.1 Data plate
Fig. 4 Data plate
1 Type/ Size (mechanical version)
2 Serial number
3 Year of construction
4 Item no.
6 Suction capacity
6 Ultimate vacuum (abs.)
7 Speed
8 Motor output
9 Operating mode