泵的故障分析及排除实例

本节介绍一些现场的泵故障分析排除的实例，这些实例虽然都是一些个例， 但通过这些例子的介绍可以给大家对泵故障分析排除的些思路和方法。

泵使用现场经常是很复杂的。故障原因多种多样，就是对于一个很有经验的人来讲，有时也会感到困难，需要经过仔细观察分析思考和计算才能找到真正的故障原因。

现场故障分析排除首先要准备好该泵的一些资料，如说明书、样本、性能曲线、总装配图等，这对分析问题时是很有用的。到了现场必须仔细实地观察和了解该泵的装置情况，工艺流程、操作过程、安装情况、电气设备情况和各仪表运行情况及数值，然后用泵的一些基本知识去进行分析和必要的计算，这样就比较容易得到泵故障的原因，进行排除。

[例1] 包头一玻璃厂，使用2台IS200-150-400型单级单吸离心泵，用作冷却循环泵，泵的流量400m3/h,扬程50m,轴功率67. 2kW。

泵的装置是这样:泵从一个较大的吸水池底部进水，然后通过泵送到玻璃制作流程中需要冷却的系统中，最后又回到吸水池中冷却。用户反映泵出口压力低，泵流量小，满足不了玻璃制作流程中的冷却需要。

解决过程:在现场观察到，泵出口压力不到0.2MPa，电流值仅为65A，没有安装流量计，所以不能测得流量值，但从回到吸水池的流量看明显较小。当关死泵出口阀门时，泵出口压力达到了泵的关死点扬程。

从上面的现象分析，泵的扬程只有20m, 电流只有65A。但轴功率67.2kW时，电流应为150A左右，泵的流量又小，但关死点扬程正常，所以判断为泵进口堵塞。但用户不同意这个判断。理由是吸水池清澈，能看到池底，哪有胜物堵塞泵。当时确实也感到有些疑惑不解，水如此干净拿什么堵?但根据上述现象分析泵进水是倒滩，不可能是汽蚀、 漏气，只能是泵进口堵塞。在找不到别的原因的情况下，用户只好同意我们意见打开系的进口检查，却发现了一个编织袋堵在了叶轮的进口上。清除编织袋后，一切正常了。原来因为吸水池是开激式的，有人随意扔进了编织袋，吸入了泵内。渣浆泵厂家

Trouble analysis and troubleshooting of pump

This section introduces some on-site examples of pump failure analysis and troubleshooting. Although these examples are all examples, they can give you some ideas and methods of pump failure analysis and troubleshooting through the introduction of these examples.

Pump use site is often very complex. There are many kinds of fault causes, that is to say, for a very experienced person, sometimes it is also difficult to find the real fault cause after careful observation, analysis and calculation.

First of all, prepare some data of the pump, such as instructions, samples, performance curves, general assembly drawings, etc., which are very useful for analyzing problems. When arriving at the site, it is necessary to carefully observe and understand the device condition, process flow, operation process, installation condition, electrical equipment condition, operation condition and value of various instruments of the pump, and then use some basic knowledge of the pump for analysis and necessary calculation, so as to easily get the cause of pump failure and eliminate it.

[example 1] two is200-150-400 single-stage single suction centrifugal pumps are used in Baotou No.1 glass factory as cooling circulating pumps. The flow of the pumps is 400m3 / h, the lift is 50m, and the shaft power is 67.2kw.

The device of the pump is as follows: the pump enters water from the bottom of a large water absorption tank, then it is pumped to the system requiring cooling in the glass making process, and finally it returns to the water absorption tank for cooling. The user reported that the pump outlet pressure was low and the pump flow was small, which could not meet the cooling needs in the glass production process.

Solution process: it was observed on site that the outlet pressure of the pump was less than 0.2MPa, the current value was only 65A, no flowmeter was installed, so the flow value could not be measured, but the flow back to the sump was obviously smaller. When the pump outlet valve is closed, the pump outlet pressure reaches the pump's closed dead point lift.

From the above analysis, the head of the pump is only 20 m, and the current is only 65 a. However, when the shaft power is 67.2kw, the current should be about 150A, the flow of the pump is small, but the head of the dead point is normal, so it is judged that the pump inlet is blocked. But the user disagrees with this judgment. The reason is that the suction pool is clear, and you can see the bottom of the pool, where is the winner blocking the pump. At that time, I did feel puzzled. What kind of water should be blocked when the water is so clean? But according to the above analysis, the water in the pump is poured into the beach, which can't be cavitation or air leakage, only the inlet of the pump is blocked. In case of no other reason, the user had to agree with us to open the inlet inspection of the system, but found a woven bag blocked on the inlet of the impeller. After removing the woven bag, everything was OK. Originally, because the suction tank is open-ended, someone threw it into the woven bag at will and inhaled it into the pump. Slurry pump manufacturer