초록 ▼

A variable capacity centrifugal pump capable of directly varying capacity, or output, in response to existing back pressure. The pump comprises a axially movable shroud having female grooves in fluid tight communication with male impeller vanes. The shroud has a top face surface in fluid communicati

A variable capacity centrifugal pump capable of directly varying capacity, or output, in response to existing back pressure. The pump comprises a axially movable shroud having female grooves in fluid tight communication with male impeller vanes. The shroud has a top face surface in fluid communication with a control cavity which in turn is in fluid communication with pump back pressure.

대표청구항 ▼

A variable capacity centrifugal pump, comprising: a casing having an axial fluid inlet means and a radial fluid outlet means; an impeller, rotationally disposed in said casing, said impeller having a plurality of impeller vanes and flow passages with axial inlet and radial outlet for channeling said

A variable capacity centrifugal pump, comprising: a casing having an axial fluid inlet means and a radial fluid outlet means; an impeller, rotationally disposed in said casing, said impeller having a plurality of impeller vanes and flow passages with axial inlet and radial outlet for channeling said fluid under the effects of said rotating impeller, said impeller sealedly disposed in said casing means by a close rotational relationship between said impeller means and said casing means; a substantially solid annular movable shroud for varying the volume of said flow passages, said movable shroud further comprising a first surface having a plurality of grooves, said grooves for receiving the vanes of said impeller in a meshing relationship, and a second surface disposed axially from said first surface, said second surface lying in a plane orthogonal to the axis of rotation of said impeller, said movable shroud sealedly disposed in said casing means by a close rotational relationship between said movable shroud and said casing means; a shroud retainer affixedly attached to said impeller, said movable shroud maintained in assembled relation and in rotational alignment with said impeller by said shroud retainer, said shroud retainer adapted to permit said movable shroud to translate axially with respect to said impeller, said shroud retainer sealedly disposed in said casing means by a close rotational relationship between said shroud retainer and said casing means; and, an annular hydraulic cavity in fluid communication with the output of said pump, one boundary of said cavity in a hydraulic pressure contacting relation with said second surface of said movable shroud.