Patent ID: 8376368

Claim:
A sealing device in a rotating machine having a housing for containing a fluid; a shaft rotatable with respect to the housing, the sealing device being provided between the shaft and the housing, said sealing device comprising: a first labyrinth arranged between the shaft and the housing, fins arranged in the first labyrinth, a second labyrinth arranged between the shaft and the housing, a cavity arranged between the first labyrinth and the second labyrinth, and a duct having a first opening upward toward the inside of the housing and a second opening connected to the cavity for allowing air inside the housing to enter the cavity, wherein the first labyrinth includes a moving wall secured to the shaft and a fixed wall secured to the housing, and an annular clearance provided between the moving wall and the fixed wall, said fins are directly secured to the moving wall for discharging the fluid entering the first labyrinth toward an inside of the housing, and said fins and the annular clearance form a centrifugal pump.