The reasons of the decrease of water pump and a solution

the reasons of the decrease of water pump, water pump performance solution

after the water water pump in use process performance after ruled out the water pump mechanical failure, but also can not find out the reasons of the decrease of water pump, it should be from the water pump of vaporization happened down as a solution to water pump performance degradation.

1, the analysis of the causes of water pump performance degradation

pump impeller and vaporization of liquid energy exchange interference and destruction, the characteristics of performance is the head - outside Flow curve, the shaft power - The flow curve, the efficiency - Flow curve. Serious will interrupt the pump in the flow, the pump can work. But in the early vaporize pump performance curve and no apparent change, when the performance curve changes, vaporization has developed to a certain extent. Different specific speed pump performance curve affected by vaporizing different form. For low specific speed pump, due to the narrow and long runner blade, so in the event of vaporization, cavitation is easy to be full of the whole flow channel, thus performance curve in the form of a sharp drop in. With the increase of specific speed, blade runner to wide and short trend change, so the cavity from the primary development there is a transition to full of the whole flow path, the corresponding water pump performance with the line began to drop is slow, to a certain amount of * is characterized by a sharp drop in. Axial flow pump performance curve in the whole flow range is just slow down. In addition, the multistage water pump vaporize to level 1, and therefore have relatively single-stage centrifugal pump performance degradation. 2 judgment for the vaporization, noise and vibration due to pump bubble burst in high continuous vaporization space-time with strong water hammer, so noise and vibration, can be heard crackling sound like a critical beans, accordingly can roughly judge whether the vaporization, this kind of circumstance can inject a small amount of air cushion vibration noise and damage to the metal this method has been widely used in hydraulic turbine, but is rarely used in the pump.

3, the solution of the decrease of water pump pump work long time under the condition of evaporation, some parts of the pump flow components can damage by vaporizing, namely cavitation. Metal will be pitting that punch. Sometimes loose metal particles and spalling and honeycomb, cavitation in addition to the mechanical force, accompanied by electrolysis, chemical corrosion and so on the many kinds of complex function. Practice has proved that the cavitation of the parts is the bubble burst. So often in the impeller import later import parts found traces cavitation static pressure water chamber, but generated in the impeller inlet, vaporization of water pump performance degradation of the solution is also should be to effect a radical cure vaporizing must prevent cavitation in the impeller inlet, for example, can reduce the pump installation height, or switch to the self-priming height high self-priming pump products.

the pump performance degradation of the solution can also refer to prevent pump cavitation method

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