The Water Pump Is Not Pumping Water， What's The Reason， Solved

1) Human factors. Some users randomly matched another motor to drive the original motor because the original motor was damaged, resulting in small flow, low head or even no water supply.

2) Mechanical failure of Sanitary Negative Pressure Pump itself. The impeller and pump shaft fastening nut loosened or the pump shaft deformed and bent, causing the impeller to move more, directly rub against the pump body, or bearing damage, which may reduce the speed of the water pump.

3) Poor maintenance of the power machine. The motor lost magnetism due to winding burnout. Changes in the number of winding turns, wire diameter, and wiring method during maintenance, or factors that did not completely eliminate the fault during maintenance will also change the speed of the water pump.

Some water sources are deeper, and some water sources have a flatter outer terrain. The allowable suction range of the water pump is ignored, resulting in less water suction or no water suction at all. It should be known that the vacuum that can be established at the water inlet of a self-priming centrifugal pump is limited. The suction range of an absolute vacuum is about 10 meters of water column height, and it is impossible for a water pump to establish an absolute vacuum.

Moreover, if the vacuum is too large, the water in the pump will be easily vaporized, which is not conducive to the operation of the pump. Therefore, each centrifugal pump has its maximum allowable suction range, which is generally between 3 and 8.5 meters. When installing a water pump, you must not only seek convenience and simplicity.

04

The resistance loss in the inlet and outlet pipes of the water flow is too large

After measurement, some users found that although the vertical distance from the reservoir or water tower to the water surface of the water source is slightly less than the pump head, the water volume is still small or no water can be lifted. The reason is often that the pipeline is too long, there are many bends in the water pipe, and the resistance loss of the water flow in the pipeline is too large.

The reason is often that the pipeline is too long, there are many bends in the water pipe, and the resistance loss of the water flow in the pipeline is too large. Generally, the resistance of a 90-degree elbow is greater than that of a 120-degree elbow. The head loss of each 90-degree elbow is about 0.5~1 meter, and the resistance of each 20-meter pipeline can cause a head loss of about 1 meter. In addition, some users also arbitrarily adjust the diameter of the inlet and outlet pipes of the water pump, which also has a certain impact on the head.