Patent ID: 8721262

Claim:
A vertical centrifugal pump, comprising: a cylindrical housing, a dual inlet impeller with upper and lower bladed rows, annular guiding vanes, an annular outlet with outer and inner casings, forming a collector below with a pressure pipe, and inlet flow channels to lower and upper rims, the last of which is formed by said housing and said outer casing, wherein said annular guiding vanes are positioned between said annular outlet and collector, said outer and inner casings are in a form of two elliptical, concentric bottoms, an outer bottom and an inner bottom, positioned along an axis of the pump, said inlet flow channels to lower rims pass through said bottoms via pipes, whose axis runs through a center of said bottoms, from said annular guiding vanes to said pipes, wherein blades with curved surfaces are placed from said inner casing to said outer casing, said blades forming pocket-cavities with a radial flow outlet between said pipes into a pressure pipe, with a steady flow stream along blades of a specific radius of curvature, wherein said pipes are connected to said lower rim through a lower annular radial-axial confuser with flat ribs, mounted radially between said pipes, wherein said confuser's internal part of profile is located from a line of intersection of internals forming a pipe, inner part of profile and outer bottom, and an outer part, positioned on a horizontal plane, from said inner casing with a smooth turn into an axial direction to a lower bladed rim, wherein an annular baffle exists between said housing and outer casing, said annular baffle comprising a corrugated casing with a minimal mounting gap on an upper end relative to said outer casing, mounted on said housing by radial ribs on upper and lower ends, wherein said radial ribs' projections form, across from said pipes, longitudinal inlet flow channels to a lower rim together with an inner annular inlet between said corrugated casing and said pressure pipe, and wherein adjacent cavities together form an outer annular inlet to an upper rim between said housing and said corrugated casing, whose lower end is located below a lowest point of said pipes, and wherein inlet flow channels to an upper rim are made between two annular elements, a lower element and an upper element, with horizontal surfaces, interconnected by radial outer ribs with a thickened, streamlined form and mated with flat inner ribs, together forming radial sectors in a transverse section of the pump, merged with an upper annular radial-axial confuser along an inner diameter of said annular elements, equal to a diameter of the position of a point of intersection of internals forming said pipe, inner parts of a profile of a lower confuser and an inner bottom, with flat radial ribs, which are a continuation of said flat inner ribs, having a smooth turn of a flow in an axial direction, which is positioned up to an upper bladed rim similar to the lower confuser.