초록 ▼

A non-contact type shaft sealing device comprising a stationary sealing ring (9) disposed to axially oppose a rotational sealing ring (2) provided on a rotational shaft (1) of a device that will be shaft-sealed, wherein a number n of air inlets (9b) provided in the stationary sealing ring (9) is in

A non-contact type shaft sealing device comprising a stationary sealing ring (9) disposed to axially oppose a rotational sealing ring (2) provided on a rotational shaft (1) of a device that will be shaft-sealed, wherein a number n of air inlets (9b) provided in the stationary sealing ring (9) is in a range of 3 to 24; a bore diameter d of a throttling mechanism provided in each of the air inlets (9b) is in a range of 0.05 to 3 mm; and concurrently, a dimensionless quantity α defined as α=8 hD/nd2 where h=inter-sealing-surface gap, and D=shaft diameter, is 1≤α≤200. Thereby, ensuring stable sealing characteristics in the non-contact type shaft sealing device, and furthermore, minimizing consumption of a barrier gas to be fed through the air inlets (9b).

대표청구항 ▼

1. A non-contact type shaft sealing device comprising: a stationary sealing ring disposed to axially oppose a rotational sealing ring provided on a rotational shaft of a device that will be shaft-sealed; an urging means for pressing said stationary sealing ring toward said rotational sealing ring, w

1. A non-contact type shaft sealing device comprising: a stationary sealing ring disposed to axially oppose a rotational sealing ring provided on a rotational shaft of a device that will be shaft-sealed; an urging means for pressing said stationary sealing ring toward said rotational sealing ring, wherein a barrier gas is fed to an inter-sealing-surface gap between mutually-facing sealing surfaces of said stationary sealing ring and said rotational sealing ring via a plurality of air inlets formed in said stationary sealing ring; a number n of said air inlets is in a range of 3 to 24; a bore diameter d of a throttling mechanism provided in each of said air inlets is in a range of 0.05 to 3 mm; and a dimensionless quantity α defined as α=8 hD/nd2 wherein, h=the inter-sealing-surface gap, and D=shaft diameter, is 1≤α≤200 thereby when α is set in this range a stable sealing characteristic is ensured and barrier gas consumption is minimized. 2. The device of claim 1, where the dimensionless quantity α is 15≤α≤160. 3. The device of claims 1, where the shaft diameter D is in a range of 10 to 500 mm. 4. The device of claims 2, where the shaft diameter D is in a range of 10 to 500 mm.