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 can also be automated. The single-shaft eccentric screw pump (1) includes: an input shaft (3) that is rotated by a driver; a rotor (5) that is connected to the input shaft (3) in a manner that enables eccentric rotation; and a stator (12) through which the rotor (5) can be inserted. The single-shaft eccentric screw pump (1) can be configured in such a way 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 formed to decrease as they move from one end toward the other, or that the eccentricity of the rotor (5) changes. The single-shaft eccentric screw pump (1) also includes a moving mechanism (50) that moves the stator (12) closer to or further away from the rotor (5) along the axial direction. The stator housing (10) includes a first stator housing (14) that supports the stator (12) and a second stator housing (16) that holds the first stator housing (14) in a manner that allows it to move relative to the stator housing in the axial direction. none.

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