Single-shaft eccentric screw pump

Abstract

The present invention provides a single-shaft eccentric screw pump that allows for easy adjustment of the tightness or clearance between the rotor and stator, and also enables automation. The single-shaft eccentric screw pump (1) comprises: an input shaft (3) rotatably supported on a bearing (32) and rotated by a drive; a rotor (5) connected to the input shaft (3) in a manner that enables eccentric rotation; a stator (12) into which the rotor (5) can be inserted; and a bearing housing (30) for housing the bearing (32), into which the input shaft (3) can be inserted; the single-shaft eccentric screw pump (1) can be formed in a manner that either or both of the outer diameter of the rotor (5) and the inner diameter of the inner hole (12a) of the stator (12) are made to decrease as they move from one end toward the other, or to change the eccentricity of the rotor, and has a moving mechanism (50) that moves the bearing (32) and the input shaft (3) together along the axial direction of the input shaft toward or away from the stator (12). none.

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