What is cavitation phenomenon of pump? How to prevent cavitation?
Answer: The suction power of the centrifugal oil pump depends on the pressure on the suction surface and the low pressure difference formed after the impeller throws out the liquid. Impeller entrance pressure is more and more low, the injection capacity is larger, but if it is lower than the saturated vapor pressure is a bubble, the original soluble in liquid in gas escape, also these small bubble with the air flow in the impeller at high, in the surrounding liquid under the action of high pressure, will be back to condensation, smaller, like a hole, then liquid around and made for the cavity at high speed, Produce very high local pressure, continuously hit the impeller surface, this high-speed, high-pressure hydraulic impact, blade surface because of fatigue and denuded pitting, honeycomb spongy.
This phenomenon of vaporization, condensation, impact and denudation is called cavitation.
Methods to prevent cavitation of CYZ self-priming centrifugal oil pump can be adopted:
(1) improve the centrifugal pump itself anti cavitation performance measures: these measures are mainly by the design and manufacturing units to achieve, for example, can change the inlet geometry of the impeller, the use of double suction impeller, can also use a lower impeller inlet speed, increase the impeller inlet diameter.
(2) Appropriately increasing the blade inlet edge width can also reduce the impeller inlet relative speed.
(3) The impeller is made of anti cavitation material.
(4) Improving the limited NPSH of the device, such as increasing the pressure on the liquid surface of the suction tank and reasonably determining the geometric installation height, can improve the effective NPSH of the pump.
(5) Effective NPSH can be improved by reducing the resistance loss of the suction line and reducing the vaporization pressure on the liquid surface.
Author: Haina Oil Pump Co., LTD., if reproduced, please reserve the author.
