HERMETICALLY SEALED ELECTRIC PUMP Russian patent published in 2021 - IPC F04D13/06 F04D13/16 F04D29/12 F04D29/58 

FIELD: pumps.

SUBSTANCE: invention relates to the field of pump building. The hermetically sealed electric pump includes a body with an inlet and an outlet branch pipes and an electric engine attached to the body. A centrifugal impeller is installed at the end of the shaft of the electric engine in the body, sealed by means of a mechanical seal. The body has a cover with a pressure chamber, including a first mechanical seal located on the side of the pumped medium, and separating the pumped medium from the buffer oil chamber. The buffer chamber is made between the cover and the electric engine and includes a second mechanical seal separating the core of the electric engine from the buffer chamber. The electric engine is cooled by supplying clean process water to the outer jacket of the stator of the electric engine. Clean process water is supplied at a constant pressure and, after the stator jacket of the electric engine is cooled, enters the chamber of the cover via a channel in the cover of the electric pump, wherein the mechanical seal is located on the side of the pumped medium, and is removed therefrom through pressure equalisation holes made in the impeller.

EFFECT: invention is aimed at increasing the reliability of operation of hermetically sealed single-stage centrifugal electric pumps due to a multiple increase in the service life of the mechanical seal on the side of the pumped medium.

1 cl, 3 dwg