1, before the start of the pipeline sewage pump, the irrigation water is not filled. Sometimes the water that appears to be irrigated has flowed out from the vent hole. But the air shaft is not discharged, and the air is discharged completely, resulting in a little air remaining in the inlet pipe or pump body.
2. There is a crack in the bend of the inlet pipe of the pipe discharge pump. There is a small gap between the inlet pipe and the connection of the pump, and the air enters the inlet pipe.
3, pipeline contact sewage pump inlet of the horizontal application of reverse flow direction, fell more than 0.5% slope, connect one end of the highest import pumps, do not completely level. If up up, the air in the inlet pipe will be kept, the vacuum degree in the water pipe and water pump will be reduced, and the water absorption will be affected.
4, the filler of the pipeline sewage pump has been worn away or the packing pressure has been too loose for a long time, resulting in a large quantity of water ejecting from the gap between the packing and the shaft sleeve of the pump. The result is that the external air enters the internal of the pump from these gaps, which affects the water lifting.
5, due to long-term potential underwater, the water inlet pipe has holes, and the water surface keeps decreasing after the water pump works. When these holes appear on the water surface, the air enters the intake pipe from the hole.
6. Human factors. Some users because of original motor damage, may be accompanied by another motor, resulting in a flow of small, low head or even the consequences of Sheung shui.
7, the mechanical failure of the pipe sewage pump itself. Impeller and pump shaft fastening nut loosening or pump shaft deformation and bending, resulting in multiple displacement of impeller, direct friction with the pump body, or bearing damage, all of which may reduce the speed of pump.
8, the pipeline sewage pump valve open. Is usually set aside a long time due to water pump, valve gasket is stuck, no washer valve may be rust.
9, pipeline sewage pump filter mesh bottom valve is blocked; or potential water valve at the end of the sludge layer caused by the blockage of the strainer.
10. The abrasion of the impeller of the pipe discharge pump is serious. The impeller blade is worn through long term use, which affects the performance of the pump. Alcohol pump
11, the gate valve or check valve failure or blockage will cause the flow reduction or even the water can not be pumped.
12, the leakage of the outlet pipe of the pipe sewage pump will also affect the water extraction. The power machine is not repaired. The motor loses its magnetic field due to the burn out of the winding. The change of winding number, wire diameter and wiring method during maintenance, or the failure of failure in maintenance will also change the speed of the pump.
The suction is too large, and some of the water is deep. Some of the water resources are flat on the outer side, while ignoring the permitted suction range of the pump, resulting in the result of less water absorption or no water at all. We must know that the degree of vacuum that can be established at the suction port of the pump is limited. The absolute vacuum suction time is about 10 meters, and the water column is high, and the water pump can not establish absolute vacuum. And the vacuum is too big, it is easy to make the water vaporization in the pump, and it is unfavorable to the work of the pump. So each centrifugal pump has its maximum allowable suction range, usually between 3 and 8.5 meters. When the pump is installed, it can not be cut easily and easily.
The resistance loss in the inlet and outlet pipes of the water is too large. Some users have measured that although the vertical distance between the reservoir and the water tower to the water surface is slightly smaller than the pump head, it still has little or no water to lift. The reason is that the pipe is too long and the pipe is more bending, and the loss of water flow in the pipe is too large. The reason is that the pipe is too long and the pipe is more bending, and the loss of water flow in the pipe is too large. In general, the 90 degree elbow is more resistant than the 120 degree elbow, and the head loss of each 90 degree elbow is about 0.5-1 meters, and the resistance of the pipe for every 20 meters can cause the loss of the head to be about 1 meters. In addition, some users are also free to pump into and out of the pipe diameter, which also have a certain impact on the lift.
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