Shaft sealing device
AssigneeEagleburgmann Japan Co., Ltd.
InventorRyo NAKAMURA
Life of this patent
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Abstract
A shaft sealing device sealing a sealed fluid includes a mating ring having a sliding surface and attached to a casing into which a rotating shaft is inserted, a commonly used seal ring having a sliding surface that slides against the sliding surface of the mating ring, and attached to the rotating shaft, and the sliding surfaces, and a backup seal ring attached to the rotating shaft on a counter-sealed fluid side in an axial direction with respect to the sliding surface of the mating ring and the sliding surface of the commonly used seal ring, and having a sliding surface facing the sealed fluid in the axial direction. The backup seal ring is movable toward the sealed fluid in the axial direction.
Claims11
1:
- A shaft sealing device that seals a sealed fluid, comprising:
- a mating ring having a sliding surface and attached to a casing into which a rotating shaft is inserted;
- a commonly used seal ring having a sliding surface that slides against the sliding surface of the mating ring, and attached to the rotating shaft;
- and
- a backup seal ring attached to the rotating shaft on a counter-sealed fluid side in an axial direction with respect to the sliding surface of the mating ring and the sliding surface of the commonly used seal ring, and having a sliding surface facing the sealed fluid in the axial direction,
- wherein the backup seal ring is movable toward the sealed fluid in the axial direction.
2:
- The shaft sealing device according to claim 1,
- wherein the backup seal ring is attached to the rotating shaft by a tightening device by which a tightening force is adjustable.
3:
- The shaft sealing device according to claim 1,
- wherein a component forming the commonly used seal ring and a component forming the backup seal ring are identical with each other, and disposed in a reverse orientation to each other.
4:
- The shaft sealing device according to claim 1,
- wherein a flow path configured for supplying the sealed fluid from an outside is connected to a sealed fluid side space inside the casing in which the commonly used seal ring is disposed.
5:
- The shaft sealing device according to claim 1,
- wherein the shaft sealing device is a water-lubricated stern tube shaft sealing device.
6:
- The shaft sealing device according to claim 2,
- wherein a component forming the commonly used seal ring and a component forming the backup seal ring are identical with each other, and disposed in a reverse orientation to each other.
7:
- The shaft sealing device according to claim 2,
- wherein a flow path configured for supplying the sealed fluid from an outside is connected to a sealed fluid side space inside the casing in which the commonly used seal ring is disposed.
8:
- The shaft sealing device according to claim 2,
- wherein the shaft sealing device is a water-lubricated stern tube shaft sealing device.
9:
- The shaft sealing device according to claim 3,
- wherein a flow path configured for supplying the sealed fluid from an outside is connected to a sealed fluid side space inside the casing in which the commonly used seal ring is disposed.
10:
- The shaft sealing device according to claim 3,
- wherein the shaft sealing device is a water-lubricated stern tube shaft sealing device.
11:
- The shaft sealing device according to claim 4,
- wherein the shaft sealing device is a water-lubricated stern tube shaft sealing device.