Design Work Of Internal Gear Pumps The internal gear pump works on the same principle, but the two interlocking gears are different in size. One interlocking gear rotates in the other. The larger gear (rotor) is an internal gear, that is, its teeth protrude inside. Within this range, a smaller external gear is installed eccentrically (idle gear-only drives the rotor). It is designed to interlock with the rotor so that the gear teeth mesh at a certain point. Pinions and bushings attached to the pump casing hold the idler in place. A fixed crescent-shaped partition or gasket fills the gap created by the eccentric mounting position of the idler and serves as a seal between the inlet and outlet. How does an internal gear pump work? The working cycle of the internal gear pump is divided into three phases: filling, transmission and conveying. When the gears are disengaged from the pump inlet side, they create an enlarged volume. As the gear continues to rotate against the pump casing and diaphragm, liquid flows into the cavity and is captured by the gear teeth. The trapped fluid moves from the inlet to the outlet around the sleeve. When the teeth of the gear are interlocked on the discharge side of the pump, the volume is reduced and the fluid is forced to be discharged under pressure. The tight tolerances between the gear and the housing allow the pump to create suction at the inlet and prevent fluid from leaking back from the discharge side (though low viscosity liquids are more likely to leak). Zhejiang Yongling Hydraulic Machine Co , Ltd . is a professional China manufacturer and supplier of Internal Gear Pumps . Our internal gear pump products have the advantages of high efficiency, small pressure fluctuations, high antifouling, and low noise. Especially this series of products are suitable for cutting machinery, plastic machinery, leather machinery, stamping machinery, engineering machinery, metallurgical machinery, etc. Welcome to buy: https://www.china-vanepump.com/product/internal-gear-pumps/