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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 discharge the air, resulting in a little air remaining in the 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 been 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 surface drops continuously after the pump works. 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 because the original motor was damaged. As a result, the result was that the flow rate was low, the head was low, or even the water could not 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 too parallel, the tight side of the transmission belt is installed on it, resulting in too small wrap angle, the calculation error 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 pump speed.
(4) Mechanical failure of the centrifugal pump itself. Loose nut between the impeller and the pump shaft 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 magnetism due to the burning of the windings. Changes in the number of winding turns, wire diameters, and wiring methods during maintenance, or failure to completely eliminate factors during maintenance will also change the speed of the water pump.