The cause and solution of low speed of medium pump

The installation of double-suction middle open pump is mainly horizontal, which is a general mechanical equipment with wide use and large use, and occupies an important position in the national economy. Double suction pump selection is mainly from the liquid delivery volume, device head, liquid properties, pipeline layout and operating conditions to consider, in order to ensure its normal work, how to maintain the pump has become particularly important. If you encounter the problem of too low speed, we can all solve the problem according to the following solutions:

1) Human factors. There are many users due to the damage of the original motor, it is free to match another motor to drive, resulting in less flow, low head and no water pumping consequences.

2) Transmission belt wear. There are many large centrifugal pumps using belt transmission, because of long-term use, the belt wear, slack, skidding phenomenon, reduce the speed of the pump.

3) Improper installation. The center distance between the two belt wheels is too small or the two axes are not parallel, the tight edge of the transmission belt is installed on the top, resulting in too small package Angle, the diameter of the two belt wheels is wrong, and the eccentric distance between the two axes of the coupled shaft drive pump is large, which will cause the speed change of the pump.

4) Engine maintenance is not recorded. The motor loses magnetism because the winding is burned, the number of turns in the winding, the diameter of the wire, the wiring method is changed in the maintenance, or the fault is not eliminated in the maintenance, the speed of the pump will also change.

5) The pump itself mechanical failure. The fastening nut of the impeller of the double suction pump and the pump shaft is loose, or the pump shaft is deformed and bent, resulting in more movement of the impeller, direct friction with the pump body, or bearing damage, which may reduce the speed of the pump.

6) Regularly check the elastic coupling parts of the pump, pay attention to the temperature rise of the motor bearing, and stop the machine immediately when noise or other abnormal sounds are found during operation, check the causes and eliminate them.