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某煤礦的并下主排水泵 200D-43 x7型多級離心泵起不起采來。
現場檢查:泵盤車輕松，但發現輸送的水比較臟， 水中含有較多的煤灰。據采的操作人員反映，泵以前運行時，回水管有些發熱。所以初步判斷回水管堵塞。當打開回水管時， 內有許多謀泥，而回水孔處已幾乎堵死。當清理完回水管和回水孔后，泵就很輕松起來。
萊煤礦的水力探煤泵 G7270 157 x9型多級離心泵，泵的流量270m3/h, 揚
程1350m,配用電機功率160kW，安裝調試發現， 機組振動很大，泵不敢長期運行。
解決過程:現場在泵的軸承處測得泵的振幅達0.3mm，泵機組周圍的地面也感到較大的振動感。檢查泵的性能軸承溫升都很正常，檢查聯軸器的對中也符合要求，泵本身并無什么問題，當時在廠里生產時，一起制造了兩臺這樣的泵，經實驗室內試驗為正常，而另一臺安裝在北京的另一個煤礦，已正常工作一個多月了，振動僅為0. 06mm,這一臺為什么振動如此之大呢?后來與煤礦的工人交談得知，在泵機組的基礎澆灌時，上一天混凝 土澆灌了一半下班了，第二天接著澆灌完，所以分析覺得是否因為基礎分層達不到強度及剛度要求，泵的功率又較大，因此造成了振動大。在找不到其他的原因的情況下，只能將基礎炸了，重新澆灌基礎，結果還真是這個原因，問題解決了。
寧波某一賓館的空調冷卻循環泵，泵的流量200m3/h,揚程32m,配用功率30kW,泵運行時振動噪音大，并且柱銷聯軸器的橡膠彈性圈只使用1 ~2h就壞了。
解決過程:現場發現柱銷彈性聯軸器的柱銷與泵端聯軸器配合的地方是直桿，應該是錐形配合，這樣用螺母拉緊后錐面緊緊貼合使柱銷不會晃動，泵端聯軸器的孔還是錐形的。原來泵上帶來的柱銷在安裝中丟失了，在寧波當地只能買到這樣直桿的。檢查兩聯軸器的對中性也不夠好，造成了振動噪聲大，橡膠彈性圈損壞快。后來購到了錐形的柱銷，并重新找正了聯軸器的對中。結果運行相當平穩，運行一天后檢查橡膠彈性圈，毫無損傷，后來了解到運行了幾個月，橡膠彈性圈沒有損壞。 渣漿泵
The 200d-43x7 multi-stage centrifugal pump of the main drainage pump in a coal mine can't afford mining.
On site inspection: Pump turning is easy, but it is found that the delivered water is dirty and contains more coal ash. According to the operating personnel, when the pump was running before, the return pipe was a little hot. Therefore, it is preliminarily judged that the return pipe is blocked. When the return pipe is opened, there are many muds in it, and the return hole is almost blocked. After cleaning the return pipe and the return hole, the pump is very easy.
G7270 157 x9 multi-stage centrifugal pump for hydraulic coal exploration in Lai coal mine, with a flow rate of 270m3 / h and a capacity of
The distance is 1350m, and the motor power is 160kW. It is found during installation and commissioning that the vibration of the unit is very large, and the pump dare not operate for a long time.
Solution: the vibration amplitude of the pump measured at the bearing of the pump is up to 0.3mm, and the ground around the pump unit also feels great vibration. Check the performance of the pump. The temperature rise of the bearing is normal. Check the alignment of the coupling. There is no problem with the pump itself. At that time, when it was produced in the factory, two such pumps were manufactured together, which were tested in the laboratory as normal, while the other one was installed in another coal mine in Beijing, which has been working normally for more than a month, and the vibration is only 0.06mm. Why does this one vibrate so Big? Later, I talked with the coal mine workers and learned that when pouring the foundation of the pump unit, half of the concrete was poured out of work the previous day, and then the next day was poured out, so I analyzed whether the pump power was large because the foundation layer could not meet the requirements of strength and rigidity, which resulted in large vibration. If no other reason can be found, the foundation can only be blasted and watered again. As a result, this is the reason and the problem has been solved.
The air conditioning cooling circulating pump of a hotel in Ningbo has a flow rate of 200m3 / h, a lift of 32m, and a power of 30kW. When the pump is running, it has a lot of vibration and noise, and the rubber elastic ring of the pin coupling is only used for 1-2h.
Solution process: it was found on site that the matching place between the pin of the pin elastic coupling and the pump end coupling is a straight rod, which should be a tapered fit. In this way, after tightening with the nut, the conical surface tightly adheres to make the pin not shake, and the hole of the pump end coupling is still tapered. The original pin on the pump was lost in the installation, and it can only be bought in Ningbo. Check the alignment of the two couplings is not good enough, resulting in large vibration and noise and fast damage of rubber elastic ring. Later, the tapered pin was purchased and the alignment of the coupling was re aligned. Results the operation was quite stable. After one day's operation, the rubber elastic ring was checked without any damage. Later, it was learned that after several months' operation, the rubber elastic ring was not damaged. Slurry pump
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