Self suction pump suction pump is not the reason why?
1. Water inlet pipe and pump body with air
(1) before the start of the pump is not filled with enough water, sometimes it looks like the water has been poured from the bleed hole overflow, but did not turn the pump shaft to the air completely discharged, resulting in a little air left in the water pipe or pump body.
(2) in contact with the water pump water level of the pipe section against the flow direction of the application of more than 0.5% of the decline in the slope, connect one end of the pump inlet of the highest, not to complete the level. If the upward tilt, will be retained within the inlet air, reduce water pipes and pumps in the vacuum, the impact of water.
(3) of the filler pump used for long-term wear and tear or packing has been pressed too loose, resulting in a lot of water ejected from the shaft sleeve and fill the gap, the result is inside of the outside air into the pump from the gaps, affecting the water extraction.
(4) due to the long-term potential of the water pipe, the pipe wall corrosion appear holes, water pump works, the water continued to decline, when these holes exposed, the air from the hole into the water inlet pipe.
(5) there is a crack in the water inlet pipe bend pipe, the water inlet pipe and the water pump connection in the small gap, it is possible to make the air into the water inlet pipe.
2. Self suction pump speed is low
(1) human factors. Damage to the part of the user because of original motor, free with the other a motor driven resulting in a small flow and low lift even of Sheung Shui consequences.
(2) mechanical failure of the pump itself. Impeller and pump shaft fastening nut loose or pump shaft deformation and bending, resulting in multi impeller, direct friction with the pump body, or bearing damage, it is possible to reduce the pump speed.
(3) power machine maintenance. Motor due to the winding burn, and loss of magnetism, maintenance of the winding turns, wire diameter, wiring method changes, or the failure of the maintenance of the fault is not completely eliminated factors will make the pump speed change.
3. Self suction pump suction process is too large
Some of the water is deep, some of the surrounding terrain is relatively flat, while ignoring the pump allows suction process, resulting in less water absorption or not the result of water suction. To know that the vacuum degree of the pump suction mouth is limited, the absolute vacuum suction process is about 10 meters high water column, while the pump can not establish an absolute vacuum. And a large vacuum, easy to make the pump water vapor, the pump work. Therefore, the centrifugal pump has its maximum allowable suction process, generally between 8.5 - 3 meters. The installation of the pump can not only facilitate simple drawings.
4. The resistance of water flow in and out of the pipe is too large.
Some users after measurement, although the water reservoir or water tower to the vertical distance from the water surface is slightly less than the pump head, but a small amount of water or Sheung Shui. The reason is that the pipe is too long, the water pipe bends more, the water flow in the pipeline resistance loss is too large. The reason is that the pipe is too long, the water pipe bends more, the water flow in the pipeline resistance loss is too large. Under normal circumstances 90 degrees bend than 120 degrees, the resistance is large, every 90 degrees bend head loss of about 0.5-1 meters, meters per 20 meters of resistance can make the head loss of about 1 meters. In addition, some users are free to pump inlet, outlet pipe diameter, which has a certain impact on the head.
5. Other factors influence
(1) at the end of valve to open. Is usually set aside a long time due to water pump, valve gasket is stuck, no washer valve may be rust.
(2) filter mesh bottom valve is blocked; or potential water valve at the end of the sludge layer caused by the blockage of the strainer.
(3) impeller wear is serious. Impeller blades have been worn for a long time, which affects the performance of the pump.
(4) gate valve can check valve failure or blockage will cause flow to reduce or even draw no water.
(5) the leakage of the export pipeline will also affect the water extraction.
