PUMP SHAFT COUPLING, PUMP AND REACTOR RECIRCULATION PUMP

摘要

PROBLEM TO BE SOLVED: To suppress the vibration during operation of a reactor recirculation pump. SOLUTION: A spacer plug 4 and a motor shaft 5 are constituted to be regularly in contact with each other, and the contact and separation between the spacer plug 4 and the motor shaft 5 is performed according to the vertical displacement of a pump shaft. According to such a structure, the increase in vibration caused by the change in contact state between the spacer plug 4 and the motor shaft 5 can be prevented. To minimize the influence of the flatness of the contact surface which leads to the inclination of the axis line of the spacer plug 4 and the axis line of the motor shaft 5 in the contact of the spacer plug 4 with the motor shaft 5, the spacer plug 4 and the motor shaft 5 are brought into contact with each other not in the center parts but only in the peripheral parts.