US 12,460,693 B2
Sealing device and drive apparatus including the same
Shingo Nishida, Tokyo (JP); and Ryoichi Kawakami, Tokyo (JP)
Assigned to MITSUBISHI HEAVY INDUSTRIES, LTD., Tokyo (JP)
Appl. No. 17/312,065
Filed by MITSUBISHI HEAVY INDUSTRIES, LTD., Tokyo (JP)
PCT Filed Jan. 11, 2019, PCT No. PCT/JP2019/000656
§ 371(c)(1), (2) Date Jun. 9, 2021,
PCT Pub. No. WO2020/144840, PCT Pub. Date Jul. 16, 2020.
Prior Publication US 2022/0025950 A1, Jan. 27, 2022
Int. Cl. F16F 9/04 (2006.01); F16F 9/36 (2006.01); F16J 3/04 (2006.01); F16J 3/06 (2006.01); F16J 15/52 (2006.01)
CPC F16F 9/04 (2013.01) [F16F 9/361 (2013.01); F16J 3/041 (2013.01); F16J 3/06 (2013.01); F16J 15/52 (2013.01)] 2 Claims
OG exemplary drawing
 
1. 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.