Thermal fatigue prevention apparatus for high temperature pump
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United States of America Patent
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-
Aug 2, 1994
Issued Date -
N/A
app pub date -
Apr 23, 1993
filing date -
Oct 26, 1990
priority date (Note) -
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status (Latency Note)
Importance
Abstract
A thermal fatigue prevention apparatus for a high temperature pump which includes an impeller in a high temperature pump casing, a pump shaft rotatably supported by a journal of a submerged bearing and projecting from a shaft through hole of a casing cover, and a shaft sealing device. The shaft sealing device is enclosed with a shaft sealing chamber which is supplied with a low temperature seal purging liquid, and a part of the seal purging liquid flows into the pump casing through the shaft through hole. A heater is provided within the high temperature pump, the heater raises the temperature of the low temperature seal purging liquid before the seal purging liquid flows into the pump casing by using the high temperature pumping liquid.
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