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 with 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 outer surface of S in the longitudinal section consists of an arc of a circle forming a convex inlet part of S outer surface and a conjugated straight line forming the 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, tapering along the flow surface, smoothly coupled with the output cylindrical surface. S length is less than SD body length. B are smoothly curved along an arc of a circle in the longitudinal section along the medium flow with a direction of flow at the outlet along SD longitudinal axis. S input section coincides with the outlet section of the groove. B entrance edge is inclined to the vertical in the longitudinal section, and 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 pumped liquid medium created by a screw, into potential energy – in increasing flow pressure of the pumped medium, and simultaneously direct the flow at the optimum angle of twist to the inlet of an impeller, which increases the anticavitation properties of a centrifugal pump.

1 cl, 4 dwg