The failure of high-lift sewage pump without water and its countermeasures

The failure of high-lift sewage pump without water and its countermeasures

　　 1. The high-lift sewage pump does not discharge water after starting: there is air in the pump or the gas in the water inlet pipe, or the bottom valve is not closed tightly.

The failure of high-lift sewage pump without water and its countermeasures

Countermeasures: remove debris, replace the damaged rubber pad, change the direction of the valve; press tightly or replace the new packing, close the gate valve or tap the door; increase the filling volume until the vent screw plug does not bubble; replace Cracked pipe; reduce the head, press the nozzle of the high-lift sewage pump into the water 0.5 meters.

　　2. The high-lift sewage pump does not rotate when starting: the packing is too tight or the impeller and the pump body are stuck and blocked by debris, or the pump shaft, bearing, or leakage reduction ring is rusted, or the pump shaft is severely bent.

　　 Countermeasures: loosen the packing, dredge the water channel; disassemble the pump body to remove debris and rust; remove the pump shaft for correction or replace with a new pump shaft.

3. The heating bearing of high-lift sewage pump is damaged: the clearance of rolling bearing or bracket cover is too small; the pump shaft is bent or the two shafts are not concentric; the tape is too tight; the oil is lacking or the oil quality is not good; the balance hole on the impeller is blocked and the impeller loses balance , Increase the thrust to one side.

Countermeasures: replace the bearing; remove the rear cover, install a gasket between the bracket and the bearing seat; adjust the pump shaft or adjust the concentricity of the two shafts; adjust the tightness of the tape appropriately; add clean butter, and the butter occupies the bearing 60% of the gap; clear the blockage in the balance hole.

4. Insufficient flow after starting: the speed is not matched or the belt is slipping, which makes the speed low; the blade installation angle of the axial flow pump is too small; the lift is insufficient; the suction is high; the bottom valve, pipeline and impeller are partially blocked or the impeller is defective; The water pipe is leaking seriously.

Countermeasures: adjust the blade angle, reduce the installation height of the vertical sewage pump; restore the rated speed, remove the belt grease, adjust the belt tightness; seal the leak of the vertical sewage pump, press the packing; remove the blockage, replace the impeller; replace The leak-reducing ring blocks the leaking place.