MONOBLOCK TYPE CENTRIFUGAL ELECTRIC PUMP Russian patent published in 2001 - IPC

FIELD: manufacture of pumps with electric drive. SUBSTANCE: electric pump has induction electric motor. Body of motor and body of pump are combined in one housing of electric pump in the form of monolithic casting. Cylindrical sleeve of housing is pressed into said casting and it carries bearing assemblies of shaft. The last has two cantilevers; one cantilever rigidly supports rotor of electric motor; impeller of pump is mounted on other cantilever and it is separated from zone of shaft bearings by means of end sealing device of hydraulic cavity and by means of secondary sealing device separated from first one by intermediate chamber. Magnetic circuit of stator of electric motor is secured to housing by means of plate in the form of annular disc or separate strips fastened to base of magnetic circuit. Sealing rings of impeller are arranged in such a way that radius of ring of driven disc is less than respective radius of ring of driving disc. Radius values are selected according to condition of compensating effort of attraction of magnetic circuits of rotor and stator by opposite-direction hydrostatic pressure effort. EFFECT: compact, small-size, easy in maintenance and adjustment, simplified for manufacturing centrifugal electric pump. 6 cl, 2 dwg