NON-CONTACT OIL SEAL MECHANISM FOR ROTATING SHAFT

摘要

A non-contact oil seal mechanism for a rotating shaft installed in a rotary machine which has the rotating shaft (12) and a casing in which a casing hole (3) rotatably holding the rotating shaft (12) is formed and in which the rotating shaft (12) is held in the casing hole (3) with a clearance t so as to come into non-contact with each other and lubricating oil flows through the clearance (t). The seal mechanism comprises an oil recovery chamber (4) formed in the inner peripheral surface of the casing hole (3) along the circumferential direction of the rotating shaft (12) and recovering the lubricating oil and a plurality of oil cutting grooves (5) formed in the outer peripheral surface of the rotating shaft (12) along the circumferential direction of the rotating shaft (12), arranged along the axial direction of the rotating shaft (12), and opposed to the oil recovery chamber (4). The plurality of oil cutting grooves (5) are formed to be stored within the axial width dimension W1 of the oil recovery chamber (4).