Standex International Corporation

Xylem IP Holdings, LLC

William Rawnsley, Jr

Robert R Kimberlin

William M Larson

Robert E Harvey, Iii

Jie Jiang

John Labbett

Neil Tindle

A sliding vane pump is provided including a pump assembly having a housing with a fluid inlet and a fluid outlet formed therein, a lining member received in the housing defining a substantially cylindrical inner surface and a rotor arranged inside the lining member, defining a substantially cylindrical outer surface. The inner surface of the lining member and outer surface of the rotor define a working space therebetween. The pump assembly also comprises a plurality of vanes received in slots formed about the rotor outer surface. Each vane is arranged to slide in the radical direction with respect to the rotor such that an outer edge of the vane contacts the lining member inner surface, thereby dividing the working space into working chambers. Rotation of the rotor draws fluid from the fluid inlet working into the working chambers, which is ejected into the fluid outlet.

Sliding vane pump

A fluid pump includes a pump head having an inlet for receiving fluid at a first pressure and an outlet for outputting fluid at a second pressure greater than the first pressure. Pressurized fluid is directed through a first passage to the outlet without the pressurized fluid leaving the pump head prior to reaching the outlet. A second passage directs pressurized fluid to a fluid circulation path which is at least partially external to the pump head with the fluid circulation path terminating adjacent the outlet. Pressurized fluid passing through the first and second passages is directed to the outlet without being re-pressurized by the pump head. The first and second passages are in opposed relation to one another to provide balancing of thrust produced by the flow of pressurized fluid through the passages. An electric motor drives the pump head. The fluid circulation path may include portions of the electric motor.

Fluid circulation path for motor pump

A motor pump is provided in which the motor rotor is optimally force balanced for enhanced operation. The motor pump includes a pump head for pressurizing a fluid, and an electric motor drives the pump head. High pressure fluid is circulated through the motor air gap. The shaft of the motor rotor is axially movable with respect to the pump head such that the motor rotor is effectively floated in high pressure fluid as the fluid flows through the motor.

Motor pump with balanced motor rotor

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Murfreesboro, TN, United States of America

William Rawnsley, Jr