Electric motor pump with magnetic coupling and thrust balancing means
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United States of America Patent
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-
Apr 10, 2001
Grant Date -
N/A
app pub date -
Nov 28, 1998
filing date -
Nov 28, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An electric motor pump for corrosive, electric conductive, cryogenic and/or hazardous liquids which is submerged in the liquid, comprising a centrifugal pump in a pump housing and an electric motor in a separate motor housing, transmitting the power through a magnetic coupling, whereby a thrust equalizing device is mounted on the rotating pump shaft. The motor housing is connected to a tubular device and the power cable is inside the tubular device and on one end connected to the electric motor stator and on the other end to the electric power grid. The motor housing and the tubular device contain an inert fluid under higher pressure than the surrounding liquid. The electric motor pump is able to operate as a reverse running pump in the turbine mode, whereby the electric motor is an induction motor operating as an induction generator.
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