Gear pump oil trapped in the phenomenon

Gear pump structure is simple and compact, easy to manufacture, easy maintenance, self-priming capacity, but flow, pressure pulsation and noise. The gear pump must be fitted with a safety valve to prevent damage to the pump or prime mover if the outlet pressure of the pump exceeds the allowable pressure for some reason, such as blockage of the discharge pipe. When a pair of teeth start to mesh, the other pair of teeth fail to disengage, which also results in a closed section between the two pairs of teeth that is neither in communication with the high pressure zone nor with the low pressure zone Oil absorption zone connected, when the gear continues to rotate, in the high-pressure zone meshing teeth rapidly increase the pressure between the hydraulic pressure, the formation of ultra-high pressure, when the team teeth turn the middle point, the space between the teeth increases, the formation of suction phenomenon, A large amount of cavitation occurs, which increases the meshing resistance of the gear during supercharging, and forms a great pressure on the sliding bearing on the floating side plate. Cavitation and noise are formed in the low pressure area. In order to ensure a smooth gear pump, gear gear overlap of more than one.

This phenomenon is called gear oil pump trapped oil phenomenon, the solution is usually to open the unloaded trough on the floating side plate, unloading trough open method is grooved in the high-pressure engagement zone, making the formation of high-pressure oil into the pressure zone, That is, the pressure port, while the low pressure zone slotted so that the formation of the vacuum when caught out of the oil port connected, so to solve the trapped oil phenomenon.

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