| 摘要 |
A non-contact type shaft sealing device comprising a rotary sealing ring (2) provided on the rotary shaft (1) of equipment to be shaft-sealed and a fixed sealing ring (9) disposed to axially face the rotary sealing ring, wherein the number of air supply holes (9b) formed in the fixed sealing ring (9) is 3 to 24, the hole diameters (d) of throttle mechanisms each provided in each air supply hole (9b) are phi 0.05 to 3 mm and a non-dimensional amount, alpha = 8hD/nd<2>, satisfies the relation, 1 </= alpha </= 200, where h: seal face gap D: shaft diameter, thereby ensuring a stable sealing property and minimizing the consumption of a barrier gas supplied through the air supply holes (9b).
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