| 摘要 |
Provided is a rotor drive mechanism wherein the dimension of a pump device in the longitudinal direction thereof is decreased and the volume of a fluid storage space within a casing is decreased; and the accuracy of a discharge rate can be improved. In a rotor drive mechanism (25) for transmitting the rotation of a drive shaft (38) which is rotated about a predetermined position to an external thread-type rotor (22) of a uniaxial eccentric screw pump (23) via a connecting shaft (39), the drive shaft (38) has an inner space (46) which opens toward the rotor (22); the connecting shaft (39) is inserted to the inner space (46); the rear end of the connecting shaft (39) is connected to the drive shaft (38) via a second joint (48), and the front end of the connecting shaft (39) is connected to the rotor (22) via a first joint (47); and a space between the inner peripheral surface of the drive shaft (38) which opens toward the rotor (22), and the outer peripheral surface of a rotor shaft (37) coupled to the rotor (22) which eccentrically rotates, is sealed by a first seal portion (55). |
