Variable Breadth Impeller that Provides a Specific Shutoff Head.
Patent, Filed 20 Apr 92, patented 18 May 93,
DEPARTMENT OF THE NAVY WASHINGTON DC
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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.
- Pumps, Filters, Pipes, Tubing, Fittings and Valves
- Marine Engineering