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水泵故障分析及排除實(shí)例03
某鋼廠使用的轉(zhuǎn)爐爐口冷卻循環(huán)泵，流量為426m3/h，揚(yáng)程50m，軸功率76.1kW，泵檢修后發(fā)現(xiàn)泵的出口壓力下降為0.45MPa,電流卻很大，為165A。
解決過程：現(xiàn)場(chǎng)了解到泵的裝置系統(tǒng)并未改變，而檢修后泵的揚(yáng)程降低，而電流卻增大，當(dāng)關(guān)死泵出口閥門時(shí)，泵達(dá)不到關(guān)死揚(yáng)程值，期初判斷認(rèn)為新?lián)Q的泵密封環(huán)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(huán)回到了泵的進(jìn)口，泵實(shí)際上是在大流量情況下運(yùn)行。打開泵檢查后發(fā)現(xiàn)忘記裝密封環(huán)了，大量的液體不從泵出口流出而回到了泵的進(jìn)口，實(shí)際上是在大流量工況下運(yùn)轉(zhuǎn)。 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
