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Analysis of the failure of centrifugal water pump without water
Centrifugal pump is a kind of vane pump, with a simple structure, easy to use, high efficiency and so on, is the most widely used in agriculture, a pump, but when the pump does not appear when the water failure, This is the most troubling thing. Xiaobian is aimed at centrifugal pumps do not water the fault, the reasons for its analysis. Centrifugal pump is not water failure causes a, the inlet pipe and the pump body air 1, some users did not fill enough water before starting the pump; it seems that irrigation has overflowed from the vent hole, but did not turn the pump shaft air completely discharged, resulting in a little The air still remains in the inlet pipe or in the pump body. 2, the contact with the pump horizontal section of the water pipe against the direction of the flow of 0.5% or more of the descending slope, connecting the pump inlet end is the highest, not completely level. Up tilt, the intake pipe will remain in the air, reducing the vacuum hose and pump, affecting water absorption. 3, due to long-term use of the pump filler has been worn or pressure over the loose packing, resulting in a large amount of water from the filler and pump shaft sleeve gap spray, the result is outside air from these gaps into the pump inside, affecting the water. 4, due to long-term diving into the water pipe wall corrosion holes, water pump work continues to decline, when these holes exposed water, the air from the hole into the water pipe. 5, cracks in the inlet pipe cracks, water pipes and pumps at the junction of a small gap, are likely to make the air into the water pipe. Second, the 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 machine 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. Third, the suction is too deep Some of the water is deep, some water peripheral potential is relatively flat, while ignoring the pump to 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. Fourth, the water flow into the water pipe resistance loss is too large Some users measure the reservoir or water tower to the water surface 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. 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. Fifth, the impact of other factors 1, 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 end of the valve filter is clogged; or at the end of the valve submersible filter layer caused by clogging. 3, serious impeller wear. 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 pumping water. 5, the export pipeline sinking will also affect the amount of water. In summary, the centrifugal pump is not water failure reason, I hope everyone after reading these contents, we can solve the pump because of the failure of this trouble caused trouble. Further reading: China Construction Water Exhibition Pump Valve Tube Fittings Exhibition Water Expo Xiamen Maritime Exhibition Industrial Internet (Xiamen) Technology Co., Ltd. Asia Pump Network Editor: He Daohui (QQ / WeChat:) http: //mj.liuti .cn / (Service Hotline:)