Accession Number : ADD015887

Title :   Variable Breadth Impeller that Provides a Specific Shutoff Head.

Descriptive Note : Patent, Filed 20 Apr 92, patented 18 May 93,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Shiffler, Mark E

Report Date : 18 May 1993

Pagination or Media Count : 12

Abstract : In accordance with the present invention, an improved variable breadth impeller for use in a variable capacity centrifugal pump and a method for adapting a variable capacity centrifugal pump to produce a specific predetermined shutoff head are provided. The variable breadth impeller is a two piece unit comprising an impeller element having a plurality of radially extending impeller vanes thereon and an axially movable shroud having a plurality of radially extending grooves therein for receiving the impeller vanes in a meshing relationship. The movable shroud further includes a plurality of axially extending grooves in its outer peripheral surface which act as a supplemental pumping means between minimum flow rate condition and shutoff condition. The operation of the improved variable breadth impeller results in a specific predetermined pressure head being attained and maintained at pump shutoff operating condition.

Descriptors :   *CENTRIFUGAL PUMPS, *IMPELLERS, *PATENTS, *NAVAL VESSELS, *FIRE PUMPS, FLOW, FLOW RATE, HEAD(ANATOMY), INVENTIONS, OPERATION, PRESSURE, PUMPING, PUMPS, RATES, SURFACES, VARIABLES, INLET GUIDE VANES, WATER PUMPS

Subject Categories : Pumps, Filters, Pipes, Tubing, Fittings & Vlvs
      Marine Engineering

Distribution Statement : APPROVED FOR PUBLIC RELEASE