Due to the suction inlet pressure range also makes the impeller is not completely symmetrical on both sides of the liquid pressure, resulting in axial force. If the liquid pressure on both sides of the impeller does not account for the cross-sectional area of ​​the shaft and does not consider the influence of impeller rotation on the pressure distribution, the force acting on the impeller is the difference between the force received by the wheel and the force exerted by the wheel cover, Is the product of the difference between the outlet pressure and the inlet pressure and the area of ​​the impeller cover because the outlet pressure is always greater than the inlet pressure so when the centrifugal pump is rotated it must have a force acting on the rotor along the shaft and pointing in the inlet.
Unbalanced axial force will aggravate the work load thrust bearing, bearing unfavorable, and axial force to the pump rotor to the suction port, causing vibration and may make the impeller ring friction damage to the pump body.
For multi-stage centrifugal pumps, the general outlet pressure is much greater than the inlet pressure, so the use of balance to eliminate axial force is particularly important, how to eliminate the axial force? Multistage pumps generally use a symmetrical installation of a balance disc and an impeller. A single-stage pump usually opens a balance hole on the impeller and, of course, balances the axial force by installing a balancing vane on the impeller disc.
Although we want to eliminate the axial force, but if completely eliminated will cause the rotor in the rotation of instability, so in the design, will design a 30% of the amount of bearings to offset, which is why the multi-stage pump Non-driven end bearings are usually the cause of angular contact bearings, because it can be used to withstand large axial forces.
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