Analysis of the reason why the centrifugal pump can't pump water
Time：2018/1/27 Source：Pearl Pump Industry Views：
There is air in the inlet pipe of the pump body
(1) Some users did not fill up the water before starting the pump; sometimes it seems that the filled water has overflowed from the vent, but the pump shaft is not turned to completely exhaust the air, resulting in a little air remaining in the water inlet pipe or pump body.
(2) The horizontal section of the inlet pipe that is in contact with the water pump should have a downward slope of more than 0.5% against the flow direction. The end connected to the inlet of the water pump is the highest, not completely horizontal. If it is tilted upwards, air will remain in the water inlet pipe, which reduces the vacuum in the water pipe and the water pump and affects water absorption. Water pump
(3) The packing of the water pump has worn out due to long-term use or the packing is too loose, causing a large amount of water to be ejected from the gap between the packing and the shaft sleeve of the pump. As a result, external air enters the interior of the pump from these gaps. Affected water lifting.
(4) Due to long-term potential underwater, the pipe wall has corroded holes, and the water level continues to drop after the pump is working. When these holes are exposed to the water surface, air enters the inlet pipe from the holes.
(5) There are cracks in the elbow of the inlet pipe, and there is a tiny gap between the inlet pipe and the water pump, which may cause air to enter the inlet pipe.
Pump speed is too low Pipeline pump
(1) Human factors. A considerable number of users arbitrarily equipped with another motor to drive due to the damage of the original motor. As a result, the flow rate is low, the head is low, or even the water cannot be pumped.
(2) The transmission belt is worn. Many large-scale water separation pumps use belt transmission. Due to long-term use, the transmission belt is worn and loose, and slipping occurs, thereby reducing the speed of the pump.
(3) Improper installation. The center distance between the two pulleys is too small or the two shafts are not parallel, the tight side of the transmission belt is installed on the top, resulting in too small wrap angle, the calculation of the diameter of the two pulleys, and the large eccentricity of the two shafts of the pump with coupling transmission, etc., will cause Changes in the speed of the water pump.
(4) The mechanical failure of the centrifugal pump itself. The impeller and the pump shaft fastening nut loose or the pump shaft is deformed and bent, causing the impeller to move too much, directly rubbing against the pump body, or bearing damage, which may reduce the speed of the pump.
(5) Repair of power machine is not recorded. The motor loses its magnetization due to the burnt windings. Changes in winding turns, wire diameter, and wiring methods during maintenance, or failure to completely eliminate factors during maintenance can also change the speed of the water pump.
