VERTICAL PULP PUMP WITH EXPOSED IMPELLER Russian patent published in 2014 - IPC F04D7/04 F04D29/22 

FIELD: engines and pumps.

SUBSTANCE: invention relates to pump engineering, particularly to vertical pulp pumps. Proposed pump comprises housing, rotor with shaft and exposed impeller. Impeller comprises main disc wit the system of curved blades separated by interblade channels. Inner surface of pump housing flow chamber and that of impeller are coated with protective layer of wearproof polymer material. Impeller disc and blades are combined and composed of shaping, primarily, plate-like structural carcass and said protective layer. Said protective layer is applied on both sides of said carcass elements to allow paired self-anchoring of opposite carcass elements and blades. Disc carcass and blades are perforated. Ratio of total areas of perforation cross section and polymer web filled therein to add to anchoring of protective layers to imperforated carcass area features definite magnitude. Disc carcass diameter is smaller than design working wheel diameter by at least two initial contour depths of protective layer. Blade carcass height is smaller than design blade height by initial contour depth of protective layer.

EFFECT: longer life, higher reliability and efficiency.

12 cl, 2 dwg