Created on:2021-12-03 13:31

Working principle of external gear pump

Working principle of external gear pump

The working principle diagram of is shown in Figure C. The main structure of the pump is a pair of gears installed in the pump housing. There are end covers on both sides of the gear for sealing. Independent working cavities sealed with each other are composed of the pump housing, end cover and each tooth of the gear. When the gear rotates continuously in the direction shown in the figure, these sealing working cavities are filled with oil in the oil suction cavity on the right, and with the high-speed rotation of the gear, the oil is brought along the outer edge of the gear into the high-pressure oil cavity on the left. In the meshing area of the teeth, with the Meshing Effect of the two gear teeth, the oil between the two teeth is forced out, and the oil pressure in the oil pressure chamber is continuously increased; In the oil suction chamber on the right, because the oil is continuously taken away, a local vacuum negative pressure is formed, and the oil from the oil inlet pipe is continuously sucked into the oil chamber to form the oil suction of the pump. When the two gears rotate continuously, the pump continuously absorbs oil from the oil tank and sends the oil to the hydraulic system. This is the basic working principle of gear pump.

The meshing and extrusion of the teeth of the two gears in the meshing area forms the isolation and sealing between the left and right oil cavities, so as to ensure that the oil suction cavity is always connected with the oil tank and isolated from the oil pressure cavity, which plays the role of flow distribution and meets the second basic condition of the pump. The continuous rotation of the oil pump gear forms the continuous change of the volume in the left and right cavities. The oil pressure chamber is constantly squeezing the sealing space, while each sealing space in the oil suction chamber is constantly transferring to the oil pressure chamber, thus continuously forming a local vacuum negative pressure. Therefore, the rotation of the gear forms the periodic change of the sealing volume, thus forming the first basic condition of the positive displacement pump.

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