ROTOR DRIVE MECHANISM, SHAFT SEAL STRUCTURE FOR ECCENTRIC SHAFT, AND PUMP DEVICE

摘要

A pump device capable of sending and placing fluid with high flow rate and high accuracy with long service life of the device maintained, reduced in size and weight, manufacturable at low cost, and energy saving. The pump device (39) has a first rotor drive mechanism (41) and a uniaxial eccentric screw pump (21). The first rotor drive mechanism (41) transmits rotation of an input shaft part (50), whose center shaft is rotated at a specified position, to an output shaft part (49) connected to a male screw rotor (23) of the uniaxial eccentric screw pump (21). The output shaft part (49) is rotatably installed on bearings at a position eccentric to the input shaft part (50). The rotation of the input shaft part (50) is transmitted to the output shaft part (49) through a first power transmission mechanism (41a) having an internal gear (27), and the output shaft part (49) performs an eccentric rotating motion. The input shaft part (50) and the output shaft part (49) are disposed on the inner side of the pitch circle of the internal gear (27).