high-speed centrifugal pump is composed of pump casing, blade wheel and its axle, bearing and its cooling and lubricating unit, bearing seal, chevron pre-seal of blade wheel between blade wheel andfront end cover, post-seal of blade wheel between blade wheel and its axle, and the seal for water outlet of blade wheel. It features that said seals form a combination of non-contact seal composed of spiral blocking pump and shielded spiral pump with contact-type mechanical seal to obtain excellent seal of blade wheel.
