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Gear pump trapped oil
Sep 06, 2018

Reason: During the operation of the involute gear pump, the hydraulic fluid is sealed between the teeth due to the closed volume at the intersection of the gears. As shown in the figure, it is called trapped oil, due to hydraulic pressure. The incompressibility of the oil will cause extreme vibration and noise of the external gear, which will affect the normal operation of the system.

Measures: opening and unloading the groove on the front and rear cover plates or the floating bushing, and the principle of opening the unloading groove: the distance between the two grooves is the minimum dead volume, and the closed volume is connected to the pressure oil chamber from the large change hour, and the dead volume is closed. When it is small, it is connected to the oil suction chamber.