Gear pump a is type of positive displacement rotary pump in which pumping action is provided by two meshing gears. The main applications of gear pump include supply of lubricating oil to motors, turbines, machine tools etc. The pumping action is not dynamic and it merely displaces the liquid from one side to the other. One of the gears of pump is keyed to a driving shaft and the other gear revolves due to driving gear. The meshing gears works in a fine clearance inside a casing. The space between teeth and the casing is filled with oil. The oil does not flow directly from inlet to outlet due the mechanical contact between the gears. The outer radial tips of the gears and sides of the gears forms a part off moving oil.
Volume of oil discharged per revolution = 2 x a x L x N m3
Where N = Speed of gears in r.p.m.
a = area enclosed between two success teeth and casing
n = number of teeth in each gear
L = axial length of teeth
Volumetric efficiency = Actual discharge / Theoretical discharge
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