Question: The inlet of multi-stage centrifugal pumps is usually located at the drive end. Why?
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Same question – does anyone know the reason? Is it a balancing mechanism with symmetrical wheel arrangement?
The balancing mechanism is located behind the impeller at the highest pressure
It’s the desktop version on mobile phones; many functions are missing from the web version. Please explain in detail, moderator. Should the torque for a multi-stage centrifugal pump be the same on whichever side it is driven from? ?
Could someone please explain what needs to be balanced?
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It may be related to the even distribution of the rotor components; if the inlet is on the non-driving side, then components such as balance discs and balance drums need to be installed on the driving side, which already has counterweights, resulting in a situation where the front part is heavier than the back； Also, it is rather troublesome to disassemble and repair it. The exact reason has to be asked of the pump designer.
On the one hand, the thrust bearings of pumps have a more complex structure than radial bearings, making them difficult to disassemble and assemble. Replacing the bearings at the drive end requires removing the coupling, and if the thrust bearings are located at the coupling end, this increases the difficulty of disassembly, assembly, and maintenance. On the other hand, since the thrust bearings are located at the non-driving end, the axial force generally acts from the non-driving end toward the driving end. As the residual axial force is borne by the thrust bearings and ultimately by the bearing housing, placing the thrust bearings at the non-driving end allows them to withstand tensile forces, **which in turn enhances the load-bearing capacity of the bearing housing. Of course, there are other factors as well; it’s necessary to consult pump design experts
It’s not convenient to rate things using a mobile phone, so please understand. The main axial force acts from the high-pressure side toward the low-pressure inlet, but with the addition of a balancing mechanism, to prevent wear on the balance disk, the overall axial force is directed outward. These are my personal opinions; I welcome any corrections.