One, cause analysis of stainless steel self suction pump
There is air in the inlet pipe and the pump
(1) before the pump starts, it does not fill enough water. Sometimes it appears that the water has been overflowing from the vent hole, but the air pump is completely discharged without turning the pump shaft, resulting in a little air remaining in the inlet pipe or pump body.
The contact with the water pump inlet of the horizontal application of reverse flow direction, fell more than 0.5% slope, connect one end of the highest import pumps, do not completely level. If up up, the air in the inlet pipe will be kept, the vacuum degree in the water pipe and water pump will be reduced, and the water absorption will be affected.
(3) the filler of the pump has been worn away or the packing pressure is too loose for a long time, resulting in a large quantity of water ejecting from the gap between the packing and the shaft sleeve of the pump. The result is that the external air enters the pump's internal part from these gaps, which affects the water lifting.
4. Due to long-term potential underwater corrosion and corrosion of the pipe wall, the water surface of the intake pipe decreases continuously. When the holes appear above the water surface, the air enters the intake pipe from the hole.
There is a crack at the bend of the inlet pipe, and there is a small gap between the inlet pipe and the connection of the water pump, which may make the air enter into the inlet pipe.
Two. The self-priming pump exceeds the allowable value
Some of the water is deep, and some of the water resources are flat on the outside. However, the allowable suction life of the pump is ignored, resulting in the result of less water absorption or no water at all. We must know that the degree of vacuum that can be established at the suction port of the pump is limited. The absolute vacuum suction time is about 10 meters, and the water column is high, and the water pump can not establish absolute vacuum. And the vacuum is too big, it is easy to produce cavitation, and it is unfavorable to the work of the pump. So the pump has its maximum allowable suction range, usually in 3 - 7.5 meters.
Three, ZX stainless steel self-priming pump speed is low
(1) human factors. Some users because of original motor damage, may be accompanied by another motor, resulting in a flow of small, low head or even the consequences of Sheung shui.
(2) the mechanical failure of the pump itself. Impeller and pump shaft fastening nut loosening or pump shaft deformation and bending, resulting in multiple displacement of impeller, direct friction with the pump body, or bearing damage, all of which may reduce the speed of pump.
The maintenance of the power machine is not good. The motor loses its magnetic field due to the burn out of the winding. The change of winding number, wire diameter and wiring method during maintenance, or the failure of failure in maintenance will also change the speed of the pump.
Four. The loss of resistance in the inlet pipe of water flow is too large
Some users have been measured, although the vertical distance from the reservoir or water tower to the water surface is slightly smaller than the pump lift, but the water is small or not lifted. The reason is that the pipe is too long and the pipe is more bending, and the loss of water flow in the pipe is too large. The reason is that the pipe is too long and the pipe is more bending, and the loss of water flow in the pipe is too large. In general, the 90 degree elbow is more resistant than the 120 degree elbow, and the head loss of each 90 degree elbow is about 0.5-1 meters, and the resistance of the pipe for every 20 meters can cause the loss of the lift to be about 1 meters. In addition, some users are also free to pump into and out of the pipe diameter, which also have a certain impact on the lift.
Five, the influence of other factors
The valve can not open. Is usually set aside a long time due to water pump, valve gasket is stuck, no washer valve may be rust.
The filter mesh bottom valve is blocked; or potential water valve at the end of the sludge layer caused by the blockage of the strainer.
3. The abrasion of the impeller is serious. The impeller blade is worn through long term use, which affects the performance of the self-priming pump.
(4) the failure or blockage of the gate valve can cause the decrease of the flow or even the water.
The leakage of the outlet pipe will also affect the amount of water.
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