某煤矿的并下主排水泵 200D-43 x7型多级离心泵起不起采来。

现场检查:泵盘车轻松，但发现输送的水比较脏， 水中含有较多的煤灰。据采的操作人员反映，泵以前运行时，回水管有些发热。所以初步判断回水管堵塞。当打开回水管时， 内有许多谋泥，而回水孔处已几乎堵死。当清理完回水管和回水孔后，泵就很轻松起来。

莱煤矿的水力探煤泵 G7270  157 x9型多级离心泵，泵的流量270m3/h, 扬

程1350m,配用电机功率160kW，安装调试发现， 机组振动很大，泵不敢长期运行。

解决过程:现场在泵的轴承处测得泵的振幅达0.3mm，泵机组周围的地面也感到较大的振动感。检查泵的性能轴承温升都很正常，检查联轴器的对中也符合要求，泵本身并无什么问题，当时在厂里生产时，一起制造了两台这样的泵，经实验室内试验为正常，而另一台安装在北京的另一个煤矿，已正常工作一个多月了，振动仅为0. 06mm,这一台为什么振动如此之大呢?后来与煤矿的工人交谈得知，在泵机组的基础浇灌时，上一天混凝 土浇灌了一半下班了，第二天接着浇灌完，所以分析觉得是否因为基础分层达不到强度及刚度要求，泵的功率又较大，因此造成了振动大。在找不到其他的原因的情况下，只能将基础炸了，重新浇灌基础，结果还真是这个原因，问题解决了。

宁波某一宾馆的空调冷却循环泵，泵的流量200m3/h,扬程32m,配用功率30kW,泵运行时振动噪音大，并且柱销联轴器的橡胶弹性圈只使用1 ~2h就坏了。

解决过程:现场发现柱销弹性联轴器的柱销与泵端联轴器配合的地方是直杆，应该是锥形配合，这样用螺母拉紧后锥面紧紧贴合使柱销不会晃动，泵端联轴器的孔还是锥形的。原来泵上带来的柱销在安装中丢失了，在宁波当地只能买到这样直杆的。检查两联轴器的对中性也不够好，造成了振动噪声大，橡胶弹性圈损坏快。后来购到了锥形的柱销，并重新找正了联轴器的对中。结果运行相当平稳，运行一天后检查橡胶弹性圈，毫无损伤，后来了解到运行了几个月，橡胶弹性圈没有损坏。 渣浆泵

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