METHOD OF AND DEVICE FOR REDUCING CAVITATION IN HYDRAULIC MACHINES Russian patent published in 2005 - IPC

FIELD: mechanical engineering.

SUBSTANCE: invention relates to devices aimed at reduction of cavitation in hydraulic machines. Method precludes break of liquid flow at striking of liquid against parts of hydraulic machines by forming controllable flow in near the boundary areas of hydraulic machines and increasing kinetic energy owing to imparting rotating component to flow in direction of movement of pump impeller. Plasticity is imparted to liquid flow by delivering air in amount of 2-5% of amount of supplied water. Device to reduce cavitation includes section of hydraulic machine pipeline made straight and eccentrically narrowing with profiled resistance elements in form of fragments of Archimedean spiral installed on its walls along passage part with inclination in flow. Section is arranged before centrifugal pump. Ratio of larger diameter of pipeline section to its smaller diameter is 1.8-1.5, and ratio of length of section to larger diameter is 1.5-2.0. Section is furnished with cylindrical rarefaction chamber installed before pump and with device to feed air into rarefaction chamber.

EFFECT: provision of reduction of cavitation in hydraulic machines.

3 cl, 1 dwg