What's the reason why self-priming pump could not out of the water

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self-priming pump water is what reason not overview

with the majority of users to the principle of self-priming pump knowledge all don't know, in case of an can't pump water are helpless, some customers will call manufacturer told factory, consulting the site condition for its knowledge mining, and factory technician is required to teach the self-priming pump suction couldn't water solution measures. Some customers don't find out the specific reason is the pump performance problems require manufacturer to send someone to the scene to solve the problem, the result to the scene is the reason caused by working conditions on site, such as import pipeline sealing is bad to the size of a human hair, eye can result in water self-priming pump suction and check whether the self-priming pump inlet piping is flat method is to put the self-priming pump run 3 to 4 minutes after downtime and then listen carefully around the pipe where there is a bursts of inspiratory sound idea find leak point repair.

what reason can't pump water is divided into the following

a, pressure pipe, and there is air in the pump body ( 1) Before starting the pump not satisfied enough, water sometimes look of irrigation water from vent overflow, turn the pump shaft to hand in the air but not fully discharge, caused a few remaining in the air inlet pipe or the pump body. （ 2) The level of contact with the water pump inlet pipe segment flow direction applied under 0. More than 5% of the down slope, connect one end of the water water pump imported as the highest, don't completely level. If up, cock would survive the air inlet tube, to reduce the vacuum in the pipes and pumps, water absorption. （ 3) packing for long-term use have wear or too loose, causing a lot of water spewing from the clearance between the pump shaft sleeve and packing, as a result, the external air from entry to the interior of the pump, the clearance affects the water. Damage of mechanical seal of pump mechanical seal leakage. （ 4) Inlet pipe because of long-term potential, underwater pipe wall corrosion holes, water pump the water falling after work, when the hole above the water, the air enters from the hole pipe within the DPP. （ 5) Inlet pipe bend fractures, the junction between inlet pipe and the water pump in small clearance, are likely to make the air into the intake pipes. Second, the water pump speed is too low, 1) Human factors. Some users because of the original motor damage, casually and deserve to go up another electric motor drive, the result is that small flow, lift and lower the consequences of not even water. （ 2) Mechanical failure of the pump itself. Impeller and the pump shaft fastening nut loose or pump shaft bending deformation, move more, cause impeller directly with the pump body friction, or bearing damage, are likely to reduce the speed of the pump. （ 3) Engine maintenance work. Motor winding burned, loss, and maintenance of winding turns, wire diameter, the change of the wiring method, or maintenance of the fault is not completely ruled out factors also can make water pump speed change. Three, some water deep suction is too big, some at the periphery of the water is relatively flat terrain, and ignores the allowable suction pump, and thus produce the suction or less is not the result of water absorption. Want to know the pump water intake can establish there is a limit to vacuum, vacuum suction of about 10 meters high water column, and the water pump can't establish a vacuum. Water pump and vacuum degree is too big, easy gasification, adverse to the pump work. So the self-priming centrifugal pump has its maximum allowable suction, usually in 3-8. 5 meters between. When installing the pump must not only simple convenience. Four, flow in and out of the water pipes in some users measured resistance loss is too high, while the reservoir or water tower water surface of the vertical distance is slightly less than the pump head, but I still carry water little or no water. The reason is often more pipe is too long, the pipe bend and flow resistance loss in the pipe is too large. The reason is often more pipe is too long, the pipe bend and flow resistance loss in the pipe is too large. Generally 90 degrees bend is greater than 120 degrees bend resistance, each about 0 90 degrees bend head losses. 5 - 1 meters, 20 meters pipe resistance can make the head loss of about 1. 1 meter. In addition, there are some users also optional pump into and out of the pipe diameter, these also have certain influence to lift. Five, the influence of other factors, 1) Bottom valve to open it. Is usually due to the water pump on hold time is too long, the bottom valve gasket was stick to death, without bottom valve of the gasket may be rust. （ 2) Bottom valve filter net blocked; In the sludge layer or bottom valve potential water filter clogging. （ 3) Wheel wear. Impeller blade wear after the long-term use, has affected the water pump performance. （ 4) Gate can check valve flow can result from a failure or blocked can't reduce even sheung shui. （ 5) Export pipeline leak will affect the amount of water.

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