Rotary seal and/or bearing
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Apr 3, 2001
Grant Date -
N/A
app pub date -
Mar 31, 1998
filing date -
Oct 2, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
For an impeller pump, the seal/bearing unit has two rotor-stator pairs of tapered sleeves arranged back-to-back. The sleeves have a spiral groove, and convey barrier-liquid from an entry-mouth in an entry-chamber to an exit-mouth in an exit-chamber. Having two sleeves gives the units mechanical stability, thrust support capability, and resistence to vibrations and other abuses. The tapered sleeves may be arranged wide-narrow-wide, or narrow-wide-narrow. The sleeves may be mounted for sliding in the housing and on the shaft, or may be fixed to the housing or shaft.
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