三, the influence of cavitation of pump.
1, over-current components erosion damage. Centrifugal pump cavitation area, usually near the entrance of the blade, then extended to the impeller outlet, cause the flow components of pump, especially behind the impeller spots and grooves, time grows, can make the flow components damage, serious when blade or before and after impeller cover plate perforation, impeller is broken, and even lead to serious accidents. Thus cavitation seriously affect the safe operation of the pump and service life.
2, produce vibration and noise. Cavitation occurs there will be vibration and noise, the bubble burst and high-speed impact will cause serious noise, cavitation process itself is a process of condensation shock, accompanied by a large pulse power. If the natural frequency of the frequency of the pulse power and equipment, it could cause strong vibration. If the pump rotating components material damage caused by cavitation, inevitably affects the rotor dynamic balance and static balance, lead to serious mechanical vibration. The vibration of the unit will not only affect the detachable parts connection, influence of pump seal, but also material fatigue damage, etc., which reduces the safety reliability of normal operation of centrifugal pump.
3, the performance degradation. Evaporation occurred serious when, the existence of a large number of bubbles will plug flow channel section, reduce the energy flow from the impeller, led to the decrease of the head, efficiency, pump performance curve has apparent change. |
