Sometimes there’s nothing quite like a reminder about the basics of various product categories. So we thought we’d take the time to review some of the major pump categories. Starting with the ever reliable Internal Gear Pump.
The crescent internal gear pump has an outer or rotor gear that is generally used to drive the inner or idler gear. The idler gear, which is smaller than the rotor gear, rotates on a stationary pin and operates inside the rotor gear.
The gears create voids as they come out of mesh and liquid flows into the pump. As the gears come back into mesh, volumes are reduced and liquid is forced out the discharge port. Liquid can enter the expanding cavities through the rotor teeth or recessed areas on the head, alongside the teeth. The crescent is integral with the pump head and prevents liquids from flowing to the suction port from the discharge port.
Please see this article at https://pyebarker.com/know-your-pumps-internal-gear-pumps/
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