1. The decrease in the flow rate of the water pump is not the reason for the speed. Because its matching motor is not variable frequency, the frequency of the power supply remains unchanged, and the number of revolutions of the motor will not change. It is also possible that the resistance of the entire system increases, causing the working point of the water pump to move to the left.
Similarly, if the outlet valve of the water pump is adjusted down or the resistance is increased in the whole system, the flow rate of the water pump will decrease, will the speed change, will the power of the motor change? The motor of the water pump is not variable frequency
(The motor of the water pump is not a frequency conversion) Adjust the outlet valve of the water pump down or increase the resistance in the whole system, the flow rate of the water pump decreases, the outlet pressure increases, and the speed does not change. There is an insignificant change in the power of the motor.
2. Because the dynamic speed is incomplete or the belt slips, the speed is low; the blade installation angle of the axial flow pump is too small, and it is not enough to relieve the pipe being too long or there is a right-angle pipe bend, the suction is high, and the valves, pipes and impellers are partially blocked at the end of the year. Or the impeller is defective; the water outlet pipe is leaking seriously.
Removal method: restore the rated speed, remove the oily belt, adjust the belt tightness, adjust the blade angle to reduce the installation position of the water pump, shorten or change the bending degree of the pipeline; seal the leakage of the pump, press the packing, remove and replace the blocked impeller, Replaced by a leak ring, plugging the leak.
