Chemical horizontal electrically drive pump unit (versions)

FIELD: engines and pumps. SUBSTANCE: invention relates to pump for aggressive fluids. Proposed unit comprises motor, rotary pump and coupling. Flow section housing includes flow section integrated with involute collector. Running section housing surrounds major part of rotor shaft and is furnished with case and bearings. Rotor shaft one extension features length exceeding that of another extension by at least two times. Working wheel is composed by multifilar impeller with main and cover discs. Main disc is protected by hydraulic lock including impeller composed by extra separated disc with beam-shape vanes. Flow section housing has circular detachable stepped wall geometrically mating said hydraulic lock. Smaller outer radius of said wall is at least the wheel flow radius while hydraulic lock impeller radius is smaller than the wheel radius. Main disc has circular ridge with inner radius smaller than that impeller disc to make circular channel communicated with hydraulic lock impeller with the wheel hub wall. Main disc comprises at least one through hole. Cover disc has inlet neck with inner lead-in radius making at least flow section housing inlet opening. EFFECT: protection against leaks, longer life, higher reliability, non-polluting design. 25 cl, 5 dwg