Patent ID: 7632065
Filing Date: 2009-12-15
Classification: F04D,Y10T

Abstract:
1. A centrifugal pump for pressurizing a fluid by rotating an impeller, said centrifugal pump comprising: a diffuser section configured to define a plurality of diffuser passages for decreasing a velocity of the fluid discharged from said impeller, said diffuser section being formed from a sheet metal; a return vane configured to define a plurality of return passages for leading the fluid which has passed through said diffuser passages to a discharge port, said return vane being formed from a sheet metal, said return vane being continuous with said diffuser section; a main plate to which said diffuser section and said return vane are fixed to define said diffuser passages and said return passages, respectively; and an outer casing enclosing said diffuser section, said return vane, and said main plate; wherein said diffuser section, said return vane, said main plate, and said outer casing are configured and arranged such that each one of said diffuser passages communicates with a respective one of said return passages to form a pressure head recovery passage separated from circumferentially adjacent pressure head recovery passages so as to prevent flow of fluid between circumferentially adjacent pressure head recovery passages.