Similar to rotary vane pumps, rotary lobe vacuum pumps and compressors are also static compression systems, although the compression does not result from an »internal« volume reduction. Thanks to the non-contact operation of the rotary lobe blower, there is no possibility of contamination of the pumped gas.
The single lobe rotary vacuum pumps R-VWP 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).
Similar to the 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 the conveying that »external compression« takes place.
Contact-free operating two (R-WPB 25) or three (R-WPB 120 – 8300) lobed rotary blower has been designed for use with pressure operations to a maximum 1 bar (abs.). The variable capacity blowers cover a range from maximum 20 to 7,964 m³/hr (11.8 to 4,684.7 cfm) in 18 sizes. Low noise level and low pulsation, high efficiency thanks to optimal speed, stable design, easy to service. See the R-WPB data sheet.