Pressure reduction is the occurrence of cavitation conditions, the existence of a large number of bubbles in water quickly rupture is the internal cause of cavitation. Therefore, to improve and reduce the cavitation damage of the main drainage pump impeller of the coal mine, it is necessary to increase the inlet pressure of the pump. Today to specifically talk about the process of pump cavitation phenomenon. Pump Cavitation Phenomenon Pump Cavitation Phenomenon Cause The absolute pressure at the pump inlet is reduced to the cavitation pressure at the current water temperature, the water evaporates. Water forms gas at the water inlet, creating many small bubbles in the water inlet. When these small bubbles flow into the high pressure area with water, the bubbles rapidly rupture and the surrounding liquid immediately fills the original bubbles and cavities. Due to the short bubble rupture time, a hydraulic impact up to several hundred MPa is formed. Bubbles continue to form and burst, a huge hydraulic impact to the frequency of tens of thousands of times per second repeatedly on the impeller, a long time, it will gradually impeller blades due to fatigue and flaking; the same time, the bubble is also mixed There are some active gases (such as oxygen), the smooth layer of metal due to electrolysis and gradually become rough. Metal surface roughness is destroyed, the more rapid mechanical erosion. In addition, the formation and rupture of bubbles in the process, the overcurrent will make the temperature difference between the two ends, the cold end and the hot end of the formation of galvanic couple potential difference, so that the metal surface electrolysis, smooth metal layer due to electrolysis gradually Become rough. In the mechanical erosion, chemical corrosion and electrochemical joint role, the metal surface quickly appeared honeycomb pitting, and gradually formed voids and damage, this phenomenon is called cavitation. Further Reading: pump valve pipe fittings Exhibition 2016 Exhibition of Information Industry, Internet (Xiamen) Technology Co., Ltd. Author: Asian pumps Network Editor: Yao Xiaoxia (QQ / micro letter:) http://beng.liuti.cn/ (Hotline :)
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