Uniaxial eccentric screw pump
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United States of America Patent
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Jul 22, 2014
Grant Date -
Jan 5, 2012
app pub date -
Mar 4, 2010
filing date -
Mar 9, 2009
priority date (Note) -
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Abstract
Disclosed is a uniaxial eccentric screw pump that can prevent the life of a bearing sliding portion from decreasing due to a thrust load applied from a high pressure side to a low pressure side. An external thread-like motor directly coupled with a driving shaft is rotated and eccentrically moved with respect to the axis of a stator to deliver a fluid from an intake side to a discharge side. The pump is provided at an end of the discharge side of the motor and extends toward the discharge side in the axial direction of the stator. The uniaxial eccentric screw pump includes an annular small-diameter portion and a seal member. The seal member is in sliding contact with the outer surface of the small-diameter portion and seals the end of a sliding portion between a self-lubricating bearing on the discharge side and the stator.
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