move As the gears inside the gear pump , the fluid volume expands. In this case, the fluid flows into the pump cavities and is trapped by the gear teeth with the rotating movement of the gears in the pump chamber. In the next step, the liquid trapped in the gear pump chamber from the inlet to the outlet flows . When the teeth of the gears on the outlet side of the pump are locked together, the volume is reduced and the fluid moves towards the outlet under pressure.
back through the center of the pump and through the gears No fluid will flow because the gears are locked together. The close tolerance between the gears and housing allows the gear pump to create suction at the pump inlet and prevent fluid leakage from the discharge side. Of course, the possibility of leakage is more in fluids with viscosity lower . The internal positive displacement self-priming pump is used for filling and emptying. Among the disadvantages of the external gear pump, we can mention the possible damages of external particles and suspended in the air.
