管中泵实际扬程低于额定扬程的原因分析

管中泵实际扬程低于额定扬程的原因分析
在实际工作中，WaterSunny管中泵的扬程会降低。管中泵扬程降低的原因及解决方法，常见的原因有：叶轮流道堵塞、内漏、进口汽蚀、转速降低、工作点向大流量低扬程方向移动、电机反转。下面将详细介绍相关的解决方案。如果叶轮流道堵塞，影响叶轮工作，出口压力下降。因此，有必要拆下泵检查并清除异物。为防止此问题再次发生，如有必要，可在泵进水口前加装过滤装置。当泵的转动部分和静止部分之间的间隙超过设计范围时，就会发生内部泄漏，这反映在泵的排放压力降低，如多级泵的叶轮环和级间间隙。此时，应进行相应的拆卸和检查，修理或更换引起间隙过大的零件。如果泵的吸入压力过低，低于泵送介质的饱和蒸汽压，就会形成气穴。此时应检查JK管路系统是否堵塞或进水口阀开度是否过小，或增加吸入罐液位高度。影响泵扬程的重要因素是叶轮外径和泵速。在其它条件下，泵扬程与转速的二次幂成正比例。由此可见，转速对管中泵扬程的影响很大。有时由于某些外部原因，泵的扬程会降低。此时应检查管中泵的转速，如果转速不够，应检查原因，合理解决。一般情况下，WaterSunny管中泵具有连续的向下性能曲线，流量随扬程的减小而增大。在运行过程中，由于某种原因，泵的背压降低，泵的工作点随装置曲线被动向低扬程、大流量点移动，导致扬程降低。事实上，这是由外部因素造成的，如设备的变化，这与管道中的泵没有特殊关系。这时，只要加大泵的背压，如关闭一点出口阀，问题就可以解决。电机反转会因接线导致电机反转，与泵的实际要求相反。这样，启动前应观察泵的方向。如果方向相反，则应交换电机端子上的任何两根导线。此外，由于配套或选型不合理，导致WaterSunny管中泵在运行中存在诸多问题，浪费能源，不能充分发挥管中泵的效率。管中泵的低扬程也是一个可能的原因。以上是龙亚管中泵技术部为广大技术新手解答的问题，如有任何疑问，请随时与上海龙亚管中泵技术部联系，我们将及时解决您的疑问。
Cause analysis of actual head lower than rated head of pump in pipe
In practice, the head of the pump in the watersunny tube will be reduced. The common reasons are: impeller passage blockage, internal leakage, inlet cavitation, speed reduction, working point moving to the direction of large flow and low head, motor reverse. The related solutions are described in detail below. If the flow passage of impeller is blocked, the work of impeller will be affected and the outlet pressure will drop. Therefore, it is necessary to remove the pump to check and remove foreign matters. In order to prevent this problem from happening again, if necessary, a filter device can be installed in front of the pump inlet. When the clearance between the rotating part and the stationary part of the pump exceeds the design range, internal leakage will occur, which is reflected in the reduction of discharge pressure of the pump, such as the impeller ring and interstage clearance of multistage pump. At this time, the corresponding disassembly and inspection should be carried out, and the parts causing excessive clearance should be repaired or replaced. If the pump suction pressure is too low, lower than the saturated vapor pressure of the pumping medium, cavitation will be formed. At this time, check whether JK pipeline system is blocked or the opening of water inlet valve is too small, or increase the liquid level height of suction tank. The important factors affecting pump head are impeller diameter and pump speed. Under other conditions, the pump head is proportional to the second power of speed. It can be seen that the speed has a great influence on the pump head. Sometimes due to some external reasons, the pump head will be reduced. At this time should check the speed of the pump, if the speed is not enough, should check the reason, reasonable solution. Generally, the pump has a continuous downward performance curve, and the flow rate increases with the decrease of the head. In the process of operation, due to some reason, the back pressure of the pump decreases, and the working point of the pump moves passively to the low head and large flow point along with the curve of the device, resulting in the decrease of the head. In fact, this is caused by external factors, such as the change of equipment, which has no special relationship with the pump in the pipeline. At this time, as long as increasing the back pressure of the pump, such as closing a little outlet valve, the problem can be solved. Motor reversal will cause motor reversal due to wiring, contrary to the actual requirements of the pump. In this way, the direction of the pump should be observed before starting. If the direction is opposite, any two wires on the motor terminals should be exchanged. In addition, due to the unreasonable matching or selection, there are many problems in the operation of watersunny in pipe pump, which wastes energy and cannot give full play to the efficiency of in pipe pump. The low head of the pump in the pipe is also a possible cause. The above questions are answered by Longya pipe pump technology department for novices. If you have any questions, please feel free to contact Shanghai Longya pipe pump technology department, and we will solve your questions in time.