水泵故障分析及排除实例03

某钢厂使用的转炉炉口冷却循环泵，流量为426m3/h，扬程50m，轴功率76.1kW，泵检修后发现泵的出口压力下降为0.45MPa,电流却很大，为165A。
    解决过程：现场了解到泵的装置系统并未改变，而检修后泵的扬程降低，而电流却增大，当关死泵出口阀门时，泵达不到关死扬程值，期初判断认为新换的泵密封环尺寸有问题，泵体与叶轮处的间隙太大，使大量的液体从密封环回到了泵的进口，泵实际上是在大流量情况下运行。打开泵检查后发现忘记装密封环了，大量的液体不从泵出口流出而回到了泵的进口，实际上是在大流量工况下运转。 渣浆泵

The converter port cooling circulating pump used in a steel plant has a flow rate of 426m3 / h, a lift of 50m, and a shaft power of 76.1kw. After the pump was overhauled, it was found that the outlet pressure of the pump decreased to 0.45MPa, but the current was very large, which was 165a.

Solution process: it is known on site that the device system of the pump has not changed, but after maintenance, the head of the pump decreases, while the current increases. When the outlet valve of the pump is closed, the pump cannot reach the value of the closed head. At the beginning of the period, it is judged that the size of the new sealing ring of the pump is in question, and the gap between the pump body and the impeller is too large, so that a large amount of liquid returns to the inlet of the pump from the sealing ring. In fact, the pump is in large flow Operation under the condition of quantity. After opening the pump for inspection, we found that we forgot to install the sealing ring. A large amount of liquid did not flow out of the pump outlet but returned to the pump inlet. In fact, it was running under the condition of large flow. Slurry pump