Multi-stage centrifugal pump - is a kind of product that we use in daily life. Multi-stage centrifugal pump is mainly divided into: horizontal multi-stage centrifugal pump and vertical multi-stage centrifugal pump. Among them, the horizontal multi-stage centrifugal pumps are: D-type multi-stage centrifugal pump, DF type corrosion-resistant multi-stage centrifugal pump, DM type mining multi-stage centrifugal pump, DY multi-stage centrifugal oil pump, DG type multi-stage boiler feed pump . GC type multistage centrifugal pump, DA, DA1 type stainless steel multistage centrifugal pump. Vertical types include: DL, DLR vertical multistage centrifugal pumps, GDL multistage centrifugal pumps, etc. Multistage centrifugal pump
First, the axial force of the multistage centrifugal pump:
1. Causes of axial force: Due to the unequal pressure of the suction and discharge ports, the pressure of the liquid on both sides of the impeller which is not completely symmetrical is not equal, thereby generating axial force. If the liquid pressure on both sides of the impeller does not count the cross-sectional area of ​​the shaft and does not consider the influence of the 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 received by the wheel cover, and is converted into a calculation formula. It is the product of the difference between the outlet pressure and the inlet pressure and the area of ​​the impeller wheel cover. Since the outlet pressure is always greater than the inlet pressure, when the centrifugal pump rotates, there must be a force along the shaft and directed toward the inlet acting on the rotor.
2. The problem of axial force generated by multi-stage centrifugal pump: Unbalanced axial force will increase the working load of the thrust bearing, which is unfavorable to the bearing. At the same time, the axial force causes the pump rotor to move to the suction port, causing vibration and possibly making Friction of the impeller ring causes damage to the pump body.
Second, how to correctly eliminate the axial force of multi-stage centrifugal pump: For multi-stage centrifugal pump, the general outlet pressure is much larger than the inlet pressure, so it is especially important to use the balance force to eliminate the axial force. How to eliminate the axial force? ?
1. Multi-stage pump The centrifugal pump generally adopts the symmetrical installation of the balance disc and the impeller. The single-stage pump generally opens the balance hole on the impeller, and of course, the balance vane is installed on the impeller disc to balance the axial force.
2. Although we are asking to eliminate the axial force, if it is completely eliminated, it will cause instability of the rotor during rotation. Therefore, at the time of design, 30% of the amount will be designed to offset the bearing, which is why Stage pump non-drive end bearings are often the cause of angular contact bearings because they can be used to withstand large axial forces.
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