Sealing device and drive apparatus including the same
AssigneeMitsubishi Heavy Industries, Ltd.
InventorsShingo Nishida, Ryoichi Kawakami
Life of this patent
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Abstract
A sealing device includes a movable part which is fixed to a shaft penetrating a wall of a vessel and is movable with the shaft, the vessel being configured to include an interior space, a first bellows part which has a first end fixed to the vessel and a second end fixed to the movable part, for sealing a penetrated portion of the vessel by the shaft, a second bellows part which is disposed opposite to the first bellows part across the movable part, and has a first end disposed on a side of the first bellows part and fixed to the movable part, and a second end fixed to a stationary member, and a communication path for causing an interior space of the first bellows part and an interior space of the second bellows part to communicate with each other.
Claims2
A sealing device, comprising:
- at least one movable part which is fixed to a shaft penetrating a wall of a vessel and is movable with the shaft, the vessel being configured to include an interior space having a higher pressure or a lower pressure than an exterior space;
- a first bellows part which has a stationary-side end fixed to the vessel and a movable-side end fixed to the at least one movable part;
- and
- a second bellows part which is disposed in series with the first bellows part in an axial direction, and has a stationary-side end fixed to a stationary member and a movable-side end fixed to the at least one movable part,
- wherein, among the stationary-side end and the movable-side end of the first bellows part and the stationary-side end and the movable-side end of the second bellows part, a distance in the axial direction between the stationary-side ends or between the movable-side ends located farthest from each other in the axial direction is constant regardless of a position of the shaft, and
- wherein an interior space of the first bellows part and an interior space of the second bellows part communicate with each other,
- wherein the shaft penetrates the wall of the vessel in a plurality of portions including a first penetrated portion and a second penetrated portion,
- wherein the at least one movable part includes a first movable member and a second movable member fixed to the shaft at positions on both sides across the vessel in the axial direction, respectively,
- wherein the first and second movable members are distinct and separate from each other,
- wherein the stationary-side end of the first bellows part is fixed to the vessel in the first penetrated portion, and the movable-side end of the first bellows part is fixed to the first movable member, and
- wherein the stationary-side end of the second bellows part is fixed to the vessel in the second penetrated portion, and the movable-side end of the second bellows part is fixed to the second movable member.
Dependencies are inferred from the claim text.