Cavitation phenomenon of pump and its causes 2011 年 07 月 22 日 1, the cavitation liquid at a certain temperature, reduce the pressure to the temperature of the vaporization pressure, the liquid will produce bubbles. The phenomenon of bubbles is called cavitation. 2, cavitation collapse Cavitation bubbles generated when the flow to high pressure Department, its volume decreases so that burst. This phenomenon of bubble disappearing in liquid due to pressure increase is called cavitation collapse. 3, the causes of cavitation and hazards Pumps in operation, if the over-flow part of the local area (usually the impeller blade inlet somewhere later) for some reason, pumping the absolute pressure of the liquid reduced to the current temperature When the liquid evaporates, the liquid begins to vaporize there, generating a large amount of steam and forming bubbles. When the liquid containing a large amount of bubbles is pushed forward through the high-pressure area inside the impeller, the high-pressure liquid around the bubbles causes the bubbles to shrink sharply and even rupture. At the same time as the bubbles are broken and condensed, the liquid particles fill the cavities at a very high speed, which causes a very strong water hammer at this moment and impacts the metal surface with a very high impact frequency with an impact stress of several hundreds to several thousands of atmospheres , The impact frequency of up to tens of thousands of times per second, the wall will be broken in serious cases. 4, the cavitation process in the pump bubbles and bubble rupture overcurrent components have been destroyed by the pump process is the process of cavitation. Pump cavitation in addition to the over-current components will have a damaging effect, but also produce noise and vibration, and lead to the decline in the performance of the pump, the pump will be severely interrupted, can not work properly. What is the characteristic curve of the pump? The curve representing the relationship between the main performance parameters is usually referred to as the performance curve or characteristic curve of the centrifugal pump. In essence, the performance curve of the centrifugal pump is an external manifestation of the movement of the liquid in the pump and is obtained by the actual measurement. The characteristic curves include: QH, Q-Q, QN, Q- (NPSH) r, and the performance curve is Pump any point of flow, can be found in the curve of a group of its head, power, efficiency and NPSH value, this group of parameters is called the working state, referred to as working conditions or conditions point, the centrifugal pump The most efficient point of the condition known as the best condition point, the best condition point is generally the design condition point. General centrifugal pump rated parameters that the design conditions point and the best conditions coincide or very close. Operating in the practice of selecting efficiency range, that is, energy conservation, but also to ensure the normal pump work, so understand the performance parameters of the pump is very important.
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