Self-pumping pump shaft seal
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United States of America Patent
Stats
-
Aug 19, 1986
Grant Date -
N/A
app pub date -
Nov 14, 1984
filing date -
Nov 14, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A positive displacement pump is provided with an impeller drive shaft seal assembly to prevent material in the pumping chamber from reaching an adjacent drive shaft chamber. The seal assembly comprises a rotary seal member mounted on the impeller having an outer surface spaced a non-uniform distance from the inner surface of a member defining the drive shaft chamber so that when the drive shaft is rotated the changing distance between the inner and outer surfaces causes a pumping action to occur so that material is continually pumped around the seal assembly.
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