Detailed Introduction

Reasons for cavitation:

For axial flow pumps, the value where the pressure at the inlet of the impeller is lower than the atmospheric pressure on the water surface of the inlet pool is usually referred to as the suction vacuum degree. When the axial flow pump is running, if the water level in the inlet pool drops too much, the suction vacuum degree will increase. When the suction vacuum degree exceeds the allowable suction vacuum degree specified, cavitation will occur; If the suction channel of the axial flow pump is not ideal, the velocity and pressure distribution of the water entering the impeller will be uneven, resulting in a local low-pressure zone. When the pressure in this low-pressure area is lower than the vaporization pressure of water, local cavitation will occur; When water flows through a narrowed gap, its velocity increases; When the pressure decreases, cavitation occurs in the gap; When the operating conditions of the axial flow pump deviate too far from the design operating conditions, the possibility of cavitation is greater than that of the design operating conditions, and cavitation may occur in the axial flow pump; Inaccurate manufacturing of axial flow pump blades may result in cavitation during operation; Due to poor inlet conditions of the axial flow pump, such as the generation of a large number of vortices in the inlet pool, when the vortices carry gas into the impeller of the axial flow pump, cavitation will occur, and the operating efficiency of the axial flow pump will decrease, resulting in vibration.

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