FIELD: engines and pumps.
SUBSTANCE: proposed pump comprises running and flow sections. Flow section housing comprises header case with circular ledged comb, rear wall consisting of connected circular comb of header case and rear wall ledged circular element as well as detachable cover. Pump running part housing is equipped with bearings and crankcase. Exposed impeller is composed of multistart impeller including vaned main disc with hub and circular comb. Aid comb features outer radius congruent with mating inner radius of circular ledged comb in header case. Said main disc is equipped with hydrodynamic protection composed by impeller. Protection is furnished with hydraulic lock with extra impeller with radius smaller than that of working impeller. Circular element of rear wall geometrically complies by inner radius of ledge with hydraulic lock radius.
EFFECT: better tightness, longer life and higher reliability.
11 cl, 2 dwg
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