Centrifugal water pump to pump water four reasons, not the cause of the water

Is not the cause of the water pump is likely to be the user has not installed correctly, would be the right way to install and use the water pump suction pipe a bottom valve must be installed at the bottom of the tank, before the start of the whole pump body and into the water pipe filled with water, water outlet valve need to be closed before start, start the pump and then slowly open the water valve, each centrifugal pump according to different type of self-priming performance is also different, need to understand when in the selection of each single stage centrifugal pump NPSH, can know the centrifugal pump self-priming height effectively.

single-stage centrifugal pump may be self-priming height is not the cause of the water beyond the effective of centrifugal pump self-priming height, the conventional single-stage centrifugal pump, self-priming height within 3 meters, beyond the height should be re-election self-priming centrifugal pump or with high vacuum auxiliary self-priming pump suction. Of single-stage pump in use is not the cause of the water it is possible that the pump cavity, impeller, bottom valve, encountered in areas such as the pipe blockage caused by debris. If single-stage centrifugal pump seal leak can also lead to can't centrifugal pump water phenomenon. Newly installed centrifugal pumps are not the cause of the water there could be a motor steering wrong, if it is to not need power outage after to exchange any two power cord.

don't pump water four reasons, the centrifugal water water pump is not the cause of the water mainly have the following reasons:

a, 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) 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.

( 3) Mechanical failure of the centrifugal pump itself. Impeller and the water 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.

2, the pump inlet pipe and pump body with the air

1) Inlet pipe because of long-term potential, underwater pipe wall corrosion holes, multistage centrifugal pump the water falling after work, when the hole above the water, the air enters from the hole pipe within the DPP.

( 2) Multistage centrifugal pump 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.

( 3) The level of contact with the pump inlet pipe segment flow direction applied under 0. More than 5% of the down slope, connect one end of the 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.

( 4) 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.

( 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.

3, water pump flow in and out of the water resistance of the excessive loss of some user

after measurement, while the reservoir or water tower water surface of the vertical distance is slightly smaller than the centrifugal pump, small but still carry water 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 pipeline resistance about 11 meters can make the head losses. In addition, there are some users also optional pump into and out of the pipe diameter, these also have certain influence to lift. Four,

water pump suction is too big some water deep, some of the periphery of the water is relatively flat terrain, and ignores the permission of the centrifugal pump, the suction and the water absorption or less is not the result of water absorption. Want to know the water pump water inlet is to establish the vacuum, there is a limit to absolute vacuum suction of about 10 meters high water column, and the centrifugal pump could not set up an absolute vacuum. Water pump and vacuum degree is too big, easy gasification, adverse to the pump work. So the centrifugal pump has its maximum allowable suction, usually in 3 - 8. 5 meters between. When installing the pump must not only simple convenience.

5. The influence of other factors (

1) Bottom valve to open it. Is usually due to centrifugal pump on hold for too long, the bottom valve gasket was stick to death, without bottom valve of the gasket may be rust.

( 2) Export pipeline leak will affect the amount of water.

( 3) Gate can check valve flow can result from a failure or blocked can't reduce even sheung shui.

( 4) Bottom valve filter net blocked; In the sludge layer or bottom valve potential water filter clogging.

( 5) The impeller inlet and port congestion

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