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水泵故障分析及排除實例03

某鋼廠使用的轉爐爐口冷卻循環泵，流量為426m3/h，揚程50m，軸功率76.1kW，泵檢修后發現泵的出口壓力下降為0.45MPa,電流卻很大，為165A。
    解決過程：現場了解到泵的裝置系統并未改變，而檢修后泵的揚程降低，而電流卻增大，當關死泵出口閥門時，泵達不到關死揚程值，期初判斷認為新換的泵密封環尺寸有問題，泵體與葉輪處的間隙太大，使大量的液體從密封環回到了泵的進口，泵實際上是在大流量情況下運行。打開泵檢查后發現忘記裝密封環了，大量的液體不從泵出口流出而回到了泵的進口，實際上是在大流量工況下運轉。 渣漿泵

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