Eccentric screw pump with expanded temperature range
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United States of America Patent
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Apr 6, 2004
Grant Date -
Apr 1, 2004
app pub date -
Oct 9, 2002
filing date -
Sep 27, 2002
priority date (Note) -
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Abstract
An eccentric screw pump or motor which includes; stators (3) having an elastic flexible coatings (32) which forms a helical bore with teeth (37) and tooth gaps (38) and a rotor (4) disposed for rolling movement in the bore and being formed with teeth (35) and tooth gaps (36) which are engageable with the stator bore. To enhance performance over a wider range of operating temperatures, the bore defined by the elastic flexible coating is formed with a plurality of waves (4) and grooves (39) which, like the teeth (37) and tooth gaps (38) of the bore are helical, but which have dimensions in both the circumferential and radial directions that are smaller than the dimensions of the teeth (37) and tooth gaps (38) of the bore.
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