Pump system with variable-pressure seal
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United States of America Patent
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-
Aug 31, 2004
Grant Date -
Oct 23, 2003
app pub date -
Apr 23, 2002
filing date -
Apr 23, 2002
priority date (Note) -
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status (Latency Note)
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Abstract
A pump system, including an impeller and an impeller shaft, which has one end secured to the impeller and another end that may be coupled to a motor to drive the impeller. The pump system further includes a substantially liquid-proof barrier which has an opening through which the impeller shaft extends. The opening in the barrier is sealed with a shaft sealing system that includes a supply chamber fluidly coupled with a cavity. The cavity surrounds, and is at least partially bounded by, the impeller shaft. The shaft sealing system further includes a pressure mechanism that is configured to pressurize lubrication matter contained within the supply chamber and cavity, so as to inhibit liquid from passing along the impeller shaft through the cavity and thereby penetrating the liquid-proof barrier. The pressure mechanism is further configured to vary pressure of the lubrication matter based on atmospheric pressure surrounding the pump system.
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