The pump shaft
of a multistage centrifugal pump is equipped with more than two impellers in
series, which can achieve a higher lift compared to ordinary single stage
centrifugal pumps; Compared to reciprocating pumps such as piston pumps and
diaphragm pumps, it can pump a larger flow rate. Multistage centrifugal pumps
have high efficiency and can meet the needs of high lift and high flow
conditions. They are widely used in petrochemical, chemical, electric power,
construction, fire protection, and other industries.
Due to the adoption of
an energy-saving hydraulic model, multi-stage centrifugal pumps have the
advantages of high efficiency and wide performance range, better meeting the
user's operational requirements. In addition, this type of pump adopts a
vertical and segmented structure, and features safe, stable operation, long
service life, small floor space, and convenient safety and
maintenance.
Reasons for low efficiency of multistage centrifugal pumps:
①
During installation, the pump, torque and speed sensor, and drive motor are not
concentric.
② There is a deviation in the zero adjustment of the dynamometer,
or the steering direction is inconsistent.
③ There is a fault with the torque
speed sensor or torque display.
④ The packing is too tight or the preload of
the mechanical seal is too large.
⑤ The balancing mechanism does not
function, increasing the axial force.
⑥ The multi-stage pump bearing is
damaged.
⑦ Poor design and manufacturing quality of impellers and other flow
passage components.
3/24/2023
Analysis of low efficiency of multistage centrifugal pumps
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