Most users of the self suction pump principle knowledge do not understand, when the pump are at a loss what to do not have water, some customers will call the manufacturers advisory site conditions tell manufacturers to understand the industrial and mining, and requests the factory technicians to teach self suction pump suction solution on water. Some customers do not understand the specific reasons about pump performance problems require manufacturers to send someone to the scene to solve the problem, the results to the scene are caused by site conditions, such as inlet pipe seal is not good hair size can lead to self suction pump suction water, the best way to check the pump inlet pipeline leaks is the self-priming pump is running 3 to 4 minutes after the stop and then listen to the suction sound Chi Chi to find the leak point where ideas around the pipeline repair.
What is the reason that the water pump does not come out of water into the following several kinds
1. There is air in the inlet pipe and in the pump
(1) no sufficient water was filled before the pump was started, sometimes the water appeared to overflow from the vent hole, but the air shaft was completely discharged without rotating the pump shaft, resulting in a little air remaining in the inlet pipe or pump body.
(2) in 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 packing of the pump has been worn away or the packing pressure has been too loose for a long time, resulting in a large amount 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 water pump from these gaps and affects the water lifting. The mechanical seal of mechanical seal is damaged.
(4) due to long-term potential underwater, the water inlet of the intake pipe has holes, and the water surface has been decreasing since the pump works. When the holes appear above the water surface, the air enters the intake pipe from the hole.
(5) there is a crack in 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 speed of the pump is too 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.
(3) 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.
Three. The sucking process is too big
Some of the water is deep, and some of the water resources are flat on the outside. However, the allowable suction range of the pump is ignored, resulting in less water absorption or no suction 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 make the water vaporization in the pump, and it is unfavorable to the work of the pump. Therefore, the self-priming pump has its maximum allowable suction range, usually between 3 and 8.5 meters. When the pump is installed, it can not be cut easily and easily.
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. Generally speaking, the resistance of the 90 degree elbow is larger than that of the 120 degree elbow. The loss of each 90 degree elbow pipe is about 0.5-1 meters, and the resistance of every 20 meters pipeline can cause the loss of the head about 11 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
(1) at the end of valve to open. Is usually set aside a long time due to water pump, valve gasket is stuck, no washer valve may be rust.
(2) 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 pump.
(4) failure or blockage of a gate valve can cause a decrease in flow or even no water.
(5) the leakage of the outlet pipe will also affect the water extraction
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