Seal Device, Seal System, And Rotary Machine

Abstract: This seal device comprises: a movable seal member disposed in a first gap formed between a stationary member and a rotating member of a rotary machine; a holding member for supporting the movable seal member, which is disposed at a radially inner side, such that the movable seal member is movable along the radial direction; and a plurality of biasing devices that bias the movable seal member radially outward along the radial direction. The holding member or the movable seal member includes a first protrusion protruding toward the other along the radial direction, the other of the holding member and the movable seal member includes a first recess that can be engaged with the first protrusion, and each of the first protrusion and the first recess is disposed between an upper end-side biasing device disposed at an upper end side of the holding member in the circumferential direction and a lower end-side biasing device disposed at a lower end side thereof, and has a side surface extending along the radial direction when viewed from the axial direction, with the side surfaces slidably facing each other.

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