Since the balance of multistage pump axial force balance design

Self balancing a total series of the even level multistage water pump impeller, in theory, the axial forces cancel each other out and perfectly balanced. But because the port components manufacturing, such as impeller, guide wheel passage parts geometry dimension precision and relative position precision and there exist deviations in design, size and direction of uncertainty inevitably exist residual axial force, the force to bear by thrust bearing.

self balancing a total series of an odd number of multistage pump impeller at level, due to the low pressure section and the high pressure section of the impeller number difference level, the complete balance of axial force conditions are destroyed. When designing consider adopting the following measures:

1) Set up the thrust bearing, such as single row angular contact bearings or thrust plate ( Watts) Bearing to bear one-way imbalance axial force;

      ( 2) Head impeller adopts double suction impeller, and axial force of the form and head adopts this kind of impeller and to improve pump cavitation resistance (

3) Since the level at the end of the balance of multistage centrifugal pump impeller with double ring to open balance holes or set back blades ( Deputy leaves) To implement the whole rotor axial force of impeller balance, actually the balance hole or set back still have 10 - leaf 15% of axial force are not balanced, still need to bear by thrust bearing. So when they are set high pressure section of the impeller series multistage series than low pressure section, to alleviate the high end bearing pressure, at the same time make the water pump axial force in the la 杄 state.

more structure design principle of reference: self balancing multistage pump structure

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