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Rotary Lobe pumps are dry running positive displacement pumps. This means that no oil or grease is needed in the compression chamber. Only the gearbox and bearings, which are separated from the pump chamber, are oil-lubricated. Two non-contact triple-lobed rotary lobes rotate against each other in the compression chamber.
Rotary lobe pumps can be used in many industrial applications that require coarse or fine vacuum.
Robust and economical
Oil-lubricated gearboxes and bearings separated from the compression chamber
Frequency control available
Rotary lobe vacuum pumps and compressors are static compression systems, although the compression does not result from an internal volume reduction. Thanks to the contact operation of the rotary lobe pump, there is no possibility of contamination of the pumped gas.
The single lobe rotary vacuum pumps have been designed for use in pump sets in combination with a rotary vane backing vacuum pump. The conveyed air is not discharged to atmosphere but piped into the inlet port of the connected high pressure stage (rotary vane pump).
Air enters the inlet opening into a conveying cell formed by the two rolling pistons in the housing. The cell is then separated from the inlet by the following piston head. The air in the cell is conveyed without reduction until it reaches the outlet, where air with a higher absolute pressure flows from the pressure chamber into the following cell, and must then be discharged. It is during this stage of conveying that external compression takes place.
Rotary lobe vacuum pumps R-VWP can be used in many applications that need coarse or fine vacuum. Two symmetrically shaped rotors rotate against each other, synchronised by a pair of gear wheels. The pumps are dry running, and consequently the compression chamber is free of grease or oil. Gear box and bearings are oil lubricated. A bypass valve integrated in the housing enables the start of the pump together with the backing pump to avoid an overload of the motor at high differential pressures.
Contact free operating rotary lobes with capacities ranging from 485 to 2,752 m³/h. Primarily used for producing coarse and fine vacuum and for handling gases and vapours, as they can tolerate water-vapour and most corrosive gases. Mainly used in combination with backing pumps.