1) Some users did not irrigate enough water before the pump was started; sometimes the water that seemed to be irrigated has overflowed from the airic pores, but the air is completely discharged without rotating the pump axis, resulting in a little air remaining in the water inlet pipe or pump body.

2) The horizontal section of the water pipe in contact with the water pump is applied to a decrease slope of more than 0.5%of the water flow direction. One end of the pump inlet is the highest, and do not fully level. If it is tilted up, air will remain in the water pipe, which will reduce the vacuum in the water pipe and pump, which will affect water absorption.

3) The fillers of the water pump have been worn over for a long time, which is overly loose, resulting in a large amount of water sprayed out of the gap between the filler and the axis shaft cover. Lifted with water.

4) Due to the long -term potential underwater, the tube wall corrosion appears holes, and the water surface continues to decline after the pump works. When these holes are exposed, the air enters the water inlet pipe from the hole.

5) Cracks appear at the bending pipe of the water inlet pipe, and a small gap appears at the connection between the water inlet pipe and the pump, which may allow the air to enter the water pipe.

Pump speed is too low:

1) Human factors. A considerable part of the user was damaged due to the damage of the original motor, and it was randomly equipped with another motor drive. As a result, the consequences of the low traffic, low raising, or even water could not be pumped.

2) Darration band wear. There are many large -scale separation pumps. They are also used for long -term use and loose driving belt wear.

3) Improper installation. The distance between the center of the two belt is too small or the two axes are not too parallel, and the tight side of the transmission belt is installed on it, causing the horn to be too small. The two -band wheels diameter calculation errors and the pump pumps with a shaft transmission are large. Changes in the speed of the pump.

4) Mechanical failure of the pump itself. The impeller and the pump shaft tightening nut loose or the pump axis is transformed and bending, causing the leaf wheels to change, directly rubbing with the pump body, or the damage of the bearings, which may reduce the speed of the pump.

(5) Direction machine maintenance is not recorded. Due to the burning of the motor, the number of winding turns, wire diameters, and wiring methods in maintenance due to the winding of the motor, or the failure of the failure of the failure during maintenance, the speed of the pump will also change.