ROTARY GEAR PUMP

Pumps use the internal gear design pumping principle to perform the positive-displacement pumping action desired. Thus, the pump has only two moving parts, the rotor and the idler gear. Pumping action is based on a rotor, idler gear and crescent-shaped partition cast integral with the cover. Power applied to the rotor is transmitted to the idler gear with which it meshes. The space between the outside diameter of the idler and the inside diameter of the rotor is sealed by the crescent. As the pump starts, the teeth come out of mesh, increasing the volume. This creates a partial vacuum, drawing the liquid into the pump through the suction port. The liquid fills the spaces between the teeth of the idler and the rotor and is carried past the crescent partition through the pressure side of the pump. When the teeth mesh on the pressure side, the liquid is forced from the spaces and out through the discharge port. The materials furnished for each pump are selected to suit individual applications.

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