Methods to
reduce cavitation of centrifugal pump
1、 Improving cavitation resistance of
centrifugal pump
1. Method 1 for reducing cavitation of centrifugal
pump
(1) Water pump with double suction impeller. NPSH due to double suction
pump Δ HC ratio: NPSH of single stage single suction centrifugal pump Δ HC is
small. For pumps with the same speed n and flow Q, double suction impellers
shall be used as much as possible.
(2) Appropriately increase the impeller
inlet diameter and increase the blade inlet width. When the impeller inlet
diameter and blade inlet width increase, the impeller inlet speed and relative
speed decrease, which shows that the critical NPSH of the pump decreases.
However, at this time, the area of the leakage reduction ring at the impeller
inlet increases, the leakage increases, and the volumetric efficiency of the
pump decreases.
(3) An inducer is added in front of the impeller. An inducer
is arranged in front of the impeller of the centrifugal pump. The inducer
operates with the blades of the pump, and the pressure wheel produced by the
inducer operates together after being coaxially assembled. The pressure
generated by the inducer pressurizes the inlet of the impeller and improves the
anti cavitation performance of the pump. However, the performance of the pump
will be unstable if the inducer is added. Therefore, further exploration and
research are needed.
2. In order to reduce the damage of cavitation to the
flow-through parts of the pump and prolong its service life, materials with
strong cavitation resistance are often used to improve the cavitation resistance
of the flow-through parts. Such as cast manganese, bronze, stainless steel and
alloy steel; Or coating or laser spraying the surface of the flow passage part
with polymer to resist cavitation damage. In addition, finishing the surface of
the flow passage part can improve its smoothness and reduce the harm of
cavitation.
What are the leakage of explosion-proof electric ball valve?
No comments:
Post a Comment