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Title:
MOTOR PUMP
Document Type and Number:
WIPO Patent Application WO2003083311
Kind Code:
B1
Abstract:
A motor pump (10) includes a pump head (22) for pressurizing a fluid and an electric motor for driving the pump head. Within the pump head, radial forces produced in two symmetrical pumping zones are balanced against each other to reduce stress and increase efficiency. High pressure fluid exits the pump and follow a flowpath through the motor air gap, through an end bearing carrying a distal end of a hollow pump rotor shaft, and returning to the pump head by way of the hollow rotor shaft (44) . The motor rotor shaft (44) is axially movable with respect to the pump head, which effectively floats the motor rotor in high pressure fluid. A motor stator barrier (56) can inhibits fluid flow into the motor stator (90) , and a rotor barrier (112) can inhibits fluid flow into the motor rotor. The rotor barrier can is efficiently attached to the rotor shaft in such a way as to stiffen the shaft and increase its bending resistance. The walls of the stator barrier can are thin and expand under fluid pressure to make contact with and find structural support from the stator laminations and motor endshield. Overheat conditions within the motor, as well as the pump head, are detected by positioning a heat sensing switch (130) within the motor adjacent the pump head (22) to shut down the motor (14) when an overheat condition is detected.

Inventors:
KIMBERLIN ROBERT R
HARVEY ROBERT E III
JIANG JIE
LARSON WILLIAM M
RAWNSLEY WILLIAM C JR
Application Number:
US0305818W
Publication Date:
March 25, 2004
Filing Date:
February 26, 2003
Export Citation:
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Assignee:
STANDEX INTERNATIONAL CORP.
International Classes:
F04C11/00; F04C14/06; F04C14/26; F04C14/28; F04C15/00; F04C23/00; F04C28/24; F04C29/04; F04D13/06; F04D29/10; F04D29/58; H02K5/128; F04C2/344; F04C29/02; (IPC1-7): F04C11/00; F04C15/00; F04C23/00; F04C29/04; F04C29/10; H02K5/128
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