TYPES OF ROTARY PUMPS (LOBE PUMP)

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 TYPES OF ROTARY PUMPS (LOBE PUMP) 

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WHAT IS LOBE PUMP? 

• A lobe pump, or rotary lobe pump, is a type of positive displacement pump. It is similar to a gear pump except the lobes are designed to almost meet, rather than touch and turn each other.

OPERATIONS OF LOBE PUMP:

• The operation of the lobe pumps is similar to the operation of the external gear pumps. Here, each of the lobes is driven by external timing gears. As a result, the lobes do not make contact. 

• Pump shaft support bearings are located in the gearbox, and since the bearings are not within the pumped liquid, pressure is limited by the location of the bearing and shaft deflection. 

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• As the lobes come out of mesh, they create expanding volume on the inlet side of the pump. The liquid then flows into the cavity and is trapped by the lobes as they rotate. 

• The liquid travels around the interior of the casing in the pockets between the lobes and the casing and it does not pass between the lobes. 

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• Finally, the meshing of the lobes forces the liquid through the outlet port under pressure. Lobe pumps are frequently used in food applications because they can handle solids without damaging the product. 

• The particle size pumped can be much larger in lobe pumps than in any other of the PD types.