Rotating machine
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Nov 21, 2000
Grant Date -
N/A
app pub date -
Jan 8, 1999
filing date -
Feb 16, 1996
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A rotating machine such as a submersible pump which comprises a casing (1) and a rotor (2) which is rotatable relative to the casing (1). The casing defines an aperature adjacent to which the rotor is positioned such that an annular gap is formed around the aperture between a first surface defined by the rotor (2) and a second surface (9) defined by the casing (1). One or both of the first and second surfaces is provided with a surface structure which is operative to prevent the accumulation of material within the gap. The irregular surface may be defined by for example a screw thread.
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