GUIDE APPARATUS OF AXIAL-FLOW HYDRAULIC PUMP AND METHOD OF MANUFACTURE OF SUCH APPARATUS Russian patent published in 2006 - IPC F04D29/54 

FIELD: manufacture of pumps, axial-flow pumps in particular.

SUBSTANCE: guide apparatus consists of external and internal shells whose surfaces are directed towards flow passage; they are used as boundaries of flow passage and are made in form of cone-shaped bodies of revolution. Shells are interconnected by means of blades of guide apparatus; they have hydrodynamic form. External and internal shells and blades of guide apparatus are made from sheet material and are connected by welding; streamlined surface of guide apparatus blade is formed by surfaces which are equidistant relative to middle surface which is linear surface in shape obtained during motion of section of straight line whose ends move over sections of smooth curves lying on inner surface of external shell and on outer surface of internal shell. External and internal shells and guide apparatus blades are manufactured as separate parts from sheet material. They are cut from developed views on sheet. Then leading and trailing edges of blades are thinned by chamfering; then blanks are bent in multi-purpose die for obtaining three-dimensional hydrodynamic shape of blade; then, parts are assembled by means of welding.

EFFECT: simplified construction; facilitated procedure of manufacture.

3 cl, 5 dwg