| 摘要 |
The present invention provides a rotor drive mechanism capable of reducing the longitudinal size of a pump apparatus and the volume of a fluid accommodating space in a casing, and improving the accuracy of a discharge rate. A rotor drive mechanism 25 is configured to transfer rotation of a driving shaft 38 to an external screw type rotor 22 of a uniaxial eccentric screw pump 23 via a connecting shaft 39, the driving shaft 38 being rotated such that the center thereof is located at a fixed position. The rotor drive mechanism 25 is configured such that: the driving shaft 38 includes an inner space 46 which is open toward the rotor 22; the connecting shaft 39 is inserted in the inner space 46; a rear end portion of the connecting shaft 39 is connected to the driving shaft 38 via a second joint portion 48; a tip end portion of the connecting shaft 39 is connected to the rotor 22 via a first joint portion 47; and a first seal portion 55 seals between an inner peripheral surface of an opening of the driving shaft 38, the opening being open toward the rotor 22, and an outer peripheral surface of the rotor shaft 37 connected to the rotor 22 configured to carry out an eccentric rotational movement. |
