First, the axial force of the centrifugal pump: 1, the axial force causes: Due to the suction exhaust port pressure also makes the impeller is not completely symmetrical on both sides of the fluid pressure range, 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. 2, the problem of axial force: Unbalanced axial force will increase thrust bearing work load, unfavorable to the bearing, while the axial force to make the pump rotor to the suction port, causing vibration and may make the impeller mouth ring friction Damage to the pump body. Second, how to correctly eliminate the axial force of centrifugal pump: For multistage centrifugal pump, 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? 1, multi-stage pump is generally used to balance the balance of impeller and the impeller installation, single-stage pump is generally open in the impeller balance hole, of course, the balance wheel mounted on the impeller wheel way to balance the axial force. 2, although we are required 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 more Non-drive end-stage pumps are often the reason for angular contact bearings because they can be used to withstand large axial forces.