CENTRIFUGAL PUMP Russian patent published in 2018 - IPC F04D1/04 F04D9/04 F04D29/44 

FIELD: motors and pumps.

SUBSTANCE: invention relates to pumping equipment. Centrifugal pump comprises a straightening device (SD) installed between the screw and impeller. SD is made with a profiled body, sleeve (S) and located between S and the inner surface of the body ten blades (B). SD body is made in the form of a confuser with an inlet groove and an outlet flange for connection, respectively, with a suction pipe and pump body. Generatrix of S outer surface in the longitudinal section consists of an arc of a circle and a straight line adjacent to it, inclined to SD longitudinal axis and forming an output conical part of S outer surface. Inner surface of SD body is formed from the entrance side by a cylindrical surface smoothly conjugated with a conical and tapered along the flow surface, smoothly coupled with the output cylindrical surface. S length is less than SD body length. B are smoothly bent in the middle part along an arc of a circle in a longitudinal section along the flow of the medium with a direction of flow at the outlet along SD longitudinal axis. B input and output edges in B longitudinal section are formed by an arc of a circle. At the entrance area, each B gradually increases its thickness and at the output section smoothly tapers towards the output edge. S input section coincides with the outlet section of the groove. B entrance edge is inclined to the vertical in the longitudinal section inside the device, in the cross section it is made at an acute angle to the radius of SD body. Longitudinal stiffeners are made on the external surface of SD body, and SD is made in the form of a single piece.

EFFECT: as a result, it is possible to more effectively convert the kinetic energy of a swirling flow of a pumped liquid into increase in the pressure of the flow of the pumped liquid medium and simultaneously increase the anticavitation properties of a centrifugal pump.

1 cl, 4 dwg