Cavitation may occur if a centrifugal pump is installed or used improperly. In the event of cavitation, the performance will be reduced, the amount of water reduced impeller damage accelerated, but also accompanied by vibration and noise, in severe cases, even the pump can not work. Therefore, pump cavitation should be avoided. In Northern Zhejiang Province, a dredging engineering company 3 # blow dredger (commonly known as suction dredge) used on the red mud pump for flushing mud, because the pipeline does not match the pump, the pump work in the large flow area, not only the motor Overload, and cavitation in the pump, affecting the normal work, after a smaller outlet pipe and reduce the pump installation height to solve this problem. One. Cavitation situation Flush pump used on the muddy ship model 8Sh-13, rated flow Qn = 288m3 / h; rated head Hn = 41.3m; motor power Pn = 55kw. After the completion of the ship, according to the measured pump parameters obtained: HA = 24.4m; QA = 400m3 / h. During the trial operation of the flushing pump, it was found that the amount of water discharged was not stable every time it was started up, and the situation became worse with the passage of time. This situation shows that the pump cavitation has occurred and gradually increased. At this point, the operator had to open the pump deflation valve, only intermittently deflated to flush stability. Second, cavitation causes In the flushing pump piping system, although the installation location of the pump is not high (the pump shaft installation height hg = 0.6m), the suction pipe is not long (pipe length L1 = 8.5m), but due to the short outlet pipe, the hydraulic loss In addition, flushing height is lower (outlet height h = 2m from water surface), the pump is working in large flow area, and the relative degree of vacuum at the inlet of pump is lower than the local vaporization pressure at that time, thus causing cavitation. Three. Improvement measures To change the existing operating conditions, there are usually three ways to deal with the replacement of new pumps, inverter speed and change the pipeline. By contrast, the decision to adopt the third alternative is simpler and cheaper. The specific approach is to change the original outlet diameter from Dg = 200mm to 150mm, tube length unchanged; flushing head outlet diameter from the original Dg = 120mm to 100mm; pump installation height from the original hg = 0.6m to 0.4 m, the rest unchanged. This transformation took only two days. After the change, conducted a real ship test. First measured the pump lift value HA ?, and then check the pump characteristic curve, then the pump flow QA? = 340m3 / h, calculated that the suction pump in the flow of vacuum less than the allowable value. So the pump does not cavitation. In later work, flushing the water situation is normal, and every time you replace the seal packing, did not find signs of impeller cavitation. Disposible Mask Machine Transducer,Ultrasonic Welding,Welding Ultrasonic Transudcer,Custom Ultrasonic Horn Wuxi Sixleaf Machinery Co. LTD , https://www.wxsixleafmachine.com