The four factors of the effluent from a sewage pump

    A water inlet pipe and the pump body, the residual air: some users in the sewage pump before the start not filled with enough water; sometimes as irrigation water from the overflow holes, but did not cross shaft rotation entirely from the air, resulting in a little air still left in the inlet or the pump body.
   Contact with the water pump inlet of the horizontal application of reverse flow direction, fell more than 0.5% slope, connect one end of the inlet of the pump is of the highest level, not completely. If the upward tilt, will be retained within the inlet air, reduce water pipes and pumps in the vacuum, the impact of water.
   Fill the pump has been used for long-term wear or packing pressed too loose, resulting from large amounts of water from filling the gap with the shaft sleeve, the result is the outside air into the pump from the inside space, affected the water.
   Because of the long-term potential of the water inlet pipe, tube corrosion holes, decreasing the water pump work, when the exposed surface of these holes, the air entering from the inlet holes.
   Office inlet pipe cracks, water inlet pipe and pump small gap junctions occur, are likely to enter the air inlet pipe.
Reason two, sewage pump speed is relatively low
   A considerable number of users due to damage to original motor, will be accompanied by another motor driven, resulting in a flow of small, low or even no water head consequences.
   There are many large from the water pump with a mass, due to prolonged use, wear belts too loose, slipping phenomenon, thereby reducing the pump speed.
   Pulley center distance is not too small or two axes are parallel, the belt tight side installation of the above, the angle is too small, the two pulley diameter calculation errors and the associated pump drive shaft axis eccentricity larger changes, will cause the pump speed.
   Impeller and pump shaft fastening nut loose or bent shaft deformation, resulting in multi impeller transfer directly between the pump body, friction, or bearing damage, which may reduce the pump speed.
   The motor windings burned because, while the loss of field, repair in the winding turns, diameter, change the connection method, or repair the fault does not completely rule out the factors will also change the water pump speed.
Reason three, ignoring the allowable suction
   Some deep water, some water outside the relatively flat terrain, while ignoring the allowable suction process pumps, resulting in little or no water without water absorption results. To know the pump suction mouth can create a vacuum is limited, the absolute vacuum suction lift of about 10 meters high water column, while the pump can not establish an absolute vacuum. And vacuum through the large, easy to pump the water gasification, and damaging to the pump. So the pump has its absorption maximum allowable range, generally 3 to 8.5 meters, when the installation of pumps must not only easy.
Four, the flow resistance loss of inlet and outlet pipe is too large
   Some users have been measured, although the water tank or water tower to the vertical distance from the surface of the water is slightly less than the pump head, but a small amount of water or no water.
   The reason is often too long pipes, water pipes bend, flow resistance losses in the pipeline is too large. The reason is often too long pipes, water pipes bend, flow resistance losses in the pipeline is too large. Under normal circumstances a 90 degree elbow bend resistance than 120 degrees, each 90 degree bend head loss of about 0.5 to 1 meters, 20 meters per channel resistance can make the head loss of about 1 meters. In addition, some users can pump into the pipe diameter, the head also has a certain influence on the.
   Of course, the effluent from a sewage pump, there are other reasons, such as the end of the valve can not open, the impeller wear, the export pipeline leakage discharge. Therefore, we in the use of water pumps, must pay attention to the above points.