Dry-pit submersible pump having a fan and a torque-relieving mechanism
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United States of America Patent
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-
Jun 27, 2000
Grant Date -
N/A
app pub date -
Oct 3, 1997
filing date -
Oct 3, 1997
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A dry-pit submersible pump using a totally enclosed fan-cooled (TEFC) electric motor to power the pump. A release mechanism prevents the fan from creating excessive drag when submerged in water. The fan cools the motor when the water level is below the motor, and the surrounding water combines with the fan to cool the motor when the water level rises to at least partially surround the motor. When the fan is at least partially submerged, the release mechanism substantially prevents the fan from imposing a load on the motor due to the surrounding water. The release mechanism can take the form of a shear key, a torque-release clutch or flexible fan blades.
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