Viking Pump TSM280: Duralobe (Discontinued) - Manual (Page 14)

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3.0 General.
3.1 Duralobe
® Pumping Principle.
The pumping action of the rotary lobe pump principle is generated by the
contra-rotation of two pumping elements (rotors) within a chamber (rotorcase),
see Fig 5. The rotors are located on shafts which in turn are held within two
cartridges mounted onto the back of the rotorcase. The shaft cartridge
assemblies comprise of, the shaft support bearings and the timing gears. The
gears transfer the energy from the drive shaft to the driven shaft,
synchronizing the rotors such that they rotate without contact with each other.
As the rotors pass the suction port, Fig 5a, the cavity increases creating a
pressure decrease, which induces the pumped medium to flow into the
rotorcase.
The pumped medium is carried around the rotorcase by the rotors, Fig 5b and
5c, to the discharge side of the pump, Fig 5d. Here the cavity decreases and
the pumped medium is discharged from the rotorcase, Fig 5e.
For pump component terms see Fig 4.
Fig 5 Rotary Lobe Pump Principle.