| 摘要 |
<p>Provided is a uniaxial eccentric screw pump which can prevent the life of a bearing sliding portion from decreasing due to a thrust load applied from a high pressure side a low pressure side. In the uniaxial eccentric screw pump 1, an external thread-like motor 2 directly coupled with a driving shaft 3 is rotated and eccentrically moved with respect to the axis of a stator 4, to deliver a fluid from a intake side to a discharge side. Further, the uniaxial eccentric screw pump 1 is provided at an end of the discharge side of the motor 4 and extends toward the discharge side in the axial direction of the stator. The uniaxial eccentric screw pump 1 includes an annular small-diameter portion 4p and a seal member 16. The external diameter of the annular small-diameter portion is smaller than the external diameter ÕB of a intake-side bearing slidingly contacting portion 4s, and the seal internal diameter pressure-receiving area of the annular small-diameter portion is larger than the area of an opening 4m of the stator 4. The seal member 16 is in a sliding contact with the outer surface of the small-diameter portion 4p, and seals the end of a sliding portion between a self-lubricating bearing 5on the discharge side and the stator 4.</p> |
