Analysis of melt gear pump floating side plate end face seal failure

When the gear pump is working, the high pressure oil from the pressure chamber is led to the outer face of the side plate through the oil hole, which acts in the closed oil cavity formed by the ear seal ring and the compensation force groove, generating compensation force, and the oil in the gear working cavity acts in the inner face of the side plate to form a counter-thrust force, and the combined force of the two presses the side plate to the gear face, ensuring that the side plate can be automatically pressed on the gear face under various working pressures.

melt gear pump

Gear pump adopts axial clearance automatic compensation structure, the main manifestation of end seal failure is severe wear of the floating side plate, the gap between the side plate and the gear end surface increases, and the volumetric efficiency of the gear pump decreases. Side plate end seal performance depends on the following two points.

1, the compression ratio of the floating side plate.

2, the tilting torque of the floating side plate.

melt gear pump for plastic extrusion

Through the analysis of the gear pump floating side plate wear problem, it is concluded that the tilting moment of the side plate is the key factor that causes the local compression ratio of the side plate to exceed the material allowable value, which in turn leads to serious local wear of the side plate. In order to improve the performance of the floating side plate end seal, the side plate structure should be designed asymmetrically to reduce the overturning moment.

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