Pipeline centrifugal pump to fight the five major reasons for small water and water
1. A water inlet pipe and a pipeline centrifugal pump has air inside the water inlet pipe and the water inlet pipe.
(1) some users before the pump is not filled with enough water to fill the hole, it seems to have been discharged from the vent hole, but not to turn the pump shaft into the air completely discharged, resulting in a little air is still left in the inlet pipe or pump body.
(2) in contact with the pipeline centrifugal pump inlet pipe level segment upstream flow direction of application of more than 0.5% decline in the slope, is connected with the water pump inlet end is highest, not to complete the level. The upward tilt, will be retained within the inlet air, reduce the degree of vacuum pipes and pumps, the impact of water.
(3) water pump packing due to long-term use has worn or packing pressed too loose, resulting in a lot of water ejected from the packing and the shaft sleeve gap, the result is the outside air is from the gap into the inside the pump, affecting the water extraction.
(4) because of the long-term water inlet pipe, the pipe wall corrosion appeared 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 elbow, the water inlet pipe and the water pump connection at the small gap, it is possible to make the air into the water inlet pipe.
2. The pipeline centrifugal pump speed is too low
(1) human factors. There is a considerable part of the user damage because of original motor, free with the other a motor driven resulting in a flow of small, low lift pumping Sheung Shui consequences.
(2) the mechanical failure of the pipeline centrifugal pump. 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 is not recorded. Motor due to the winding burn, and loss of magnetism, the maintenance of the winding turns, wire diameter, wiring method changes, or maintenance of the fault is not completely ruled out factors will make the pump speed change.
3. The pipeline centrifugal pump suction process is too large
Some of the water is deep, some of the water source is relatively flat, while ignoring the pump allows suction process, resulting in a small water absorption or not the results of water absorption. To know that the pump suction port to establish a vacuum is limited, the absolute vacuum suction process is about 10 meters high water column, and the pump can not establish an absolute vacuum. Vacuum through the large, easy to pump the water gasification, damaging to the pump. Each centrifugal pump has its maximum allowable suction process, generally between 8.5 to 3 meters, when the installation of the pump can not only facilitate simple.
4. Water flow in and out of the resistance in the pipe is too large
Some users to measure, the water reservoir or water tower to the vertical distance between 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 resistance loss in the water pipeline is too large. The reason is that the pipe is too long, the water pipe bends more, the resistance loss in the water pipeline is too large. Under normal circumstances 90 degrees bend than 120 degrees, the resistance is large, each 90 degrees bend head loss of about 0.5 to 1 meters, meters per 20 meters of pipeline resistance can make the head loss of about 1 meters. In addition, some users are also free to pump inlet, outlet pipe diameter, which has a certain impact on the head.
5. Other factors
(1) at the end of valve to open. The pump is usually set aside a long time, valve gasket is stuck, no washer valve may be rust.
(2) filter mesh bottom valve is blocked; or the sludge layer at the end of the valve in the diving caused by blocked filters.
(3) impeller wear is serious. Impeller blades have been worn for a long time, which affects the performance of the pump.
(4) gate valve or check valve malfunction or blockage will cause the flow to reduce the pumping does not Sheung shui.
(5) the leakage of the Lu pipeline will also affect the water extraction.
