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Centrifugal pump to mention the main reasons for the water analysis: Centrifugal pump with its simple structure, easy maintenance, high efficiency and become the most widely used in agriculture, a pump, but also because of mention of the water is troublesome . Now on the water to mention the reasons for this accident to be analyzed. There is air in the water inlet pipe and pump body. (1) Some users do not fill enough water before starting the pump. It appears that the water has overflowed from the vent hole, but the air is completely discharged without rotating the pump shaft, causing a little air to still remain in the water inlet pipe or the pump body in. (2) In case of contact with the water pump, the horizontal section of the water inlet pipe should be descended 0.5% or more to the reverse water flow direction. Up tilt, the intake pipe will remain in the air, reducing the vacuum hose and pump, affecting water absorption. (3) The long-term use of the pump packing has been worn or the packing pressure is too loose. As a result, a large amount of water is ejected from the gap between the packing and the pump shaft sleeve. As a result, external air enters the pump from these gaps and affects the water supply. (4) The water inlet pipe is corroded due to long-term diving, and the surface of the water pipe is continuously declining. When the water holes are exposed, the air enters the water inlet pipe from the hole. (5) cracks in the inlet pipe cracks, inlet pipe and pump connections appear a small gap, are likely to make the air into the inlet pipe. Pump speed is too low (1) Human factors. A considerable part of the user due to the original motor damage, it is coupled with another motor-driven, resulting in less traffic, head pumping low-pumping consequences. (2) belt wear. There are many large pump away from the belt, because of long-term use, belt wear and loose, there slipping, reducing the pump speed. (3) improper installation. Two pulley center distance is too small or two axes are not parallel, tight belt mounted to the top, resulting in the wrapping angle is too small, the two pulley diameter calculation error and coupling shaft pump two eccentric eccentricity, etc., will cause the pump Speed ​​changes. (4) the pump itself mechanical failure. Loosening of the impeller and the shaft of the pump shaft or the deformation and bending of the shaft of the pump cause the impeller to move more, directly friction with the pump body, or bearing damage, which may reduce the pump speed. (5) Power engine maintenance does not record. The motor burned due to the winding, and loss of magnetism, the maintenance of winding turns, diameter, wiring methods change, or maintenance failure is not completely ruled out factors will also make the pump speed change. Suction too much Some deep water, some water outside the potential is relatively flat, and ignore the pump allow suction, resulting in little or no absorption of water absorption results. To know the pump suction port to establish a degree of vacuum is limited, the absolute vacuum suction is about 10 meters high water column, and the pump can not establish an absolute vacuum. The degree of vacuum is too large, easy to gasify the pump, work on the pump negative. Each centrifugal pump has its maximum allowable suction, usually 3 to 8.5 meters, not only when installing the pump is simple and convenient. Water flow into and out of the pipe resistance loss is too large Some users measure the reservoir or water tower to the water source vertical distance slightly less than the pump head, but to mention a small amount of water or mention the water. The reason is often too long pipe, pipe bend more water pipe resistance loss is too large. The reason is often too long pipe, pipe bend more water pipe resistance loss is too large. Under normal circumstances, 90-degree bend pipe bending resistance than the 120-degree bend, each 90-degree elbow head loss of about 0.5 to 1 meter, 20-meter pipe resistance can make head loss of about 1 meter. In addition, some users are also free to pump into and out of pipe diameter, these have some impact on the lift. Other factors (1) at the end of the valve can not be opened. Pump is usually set aside too long time, the bottom valve gasket was sticky, no gasket at the end of the valve may rust. (2) the bottom valve filter is clogged; or the bottom valve causes the clogging of the filter in the sludge layer. (3) impeller wear serious. Impeller blades worn by long-term use, affecting the pump performance. (4) Gate valve or check valve failure or blockage will result in reduced flow pumping not on the water. (5) drain pipe leakage will also affect the amount of water.
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