Method of producing elastomeric stators for eccentric helical pumps
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United States of America Patent
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Feb 12, 1991
Grant Date -
N/A
app pub date -
Jul 28, 1989
filing date -
Jul 30, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method of producing elastomeric stators for eccentric helical pumps, with the elastomer shrinking after the stator has been produced. To increase the precision of the pump cavity, this cavity is first made larger than desired. The closed metallic annular casing that surrounds the stator on the outside is then reduced in diameter, for example via a die. In so doing, the elastomer is radially compressed to thereby bring the pump cavity to a precise inner dimension that is a function of the reduction of the casing diameter and is hence independent of the shrinkage.
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