FIELD: chemical engineering.
SUBSTANCE: invention can be used in centrifugal pumps whose flow passage part is protected by polymeric coating. Proposed centrifugal pump impeller has metal hub and protective polymetric coating forming parts of impeller in contact with handled liquid. Hub is provided with coaxial metal ring connected with hub by permanent joint, and oval holes. Long axes of oval holes are arranged radially and symmetrically to hub axis, ratio of ring area to summary area of oval being from 3 to 5, ratio of width of oval holes to thickness of protective coating being from 1 to 3, ratio of length of oval holes to their width being from 1 to 5, and ratio of outer diameter of impeller to outer diameter of ring being from 1.02 to 1.10. Polymeric coating is made of fluoroplastic.
EFFECT: increased service life.
2 dwg
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