Axial-flow fluid machinery, and variable vane drive device thereof

A variable vane drive device of an axial-flow fluid machine with a rotor having a plurality of blades, a casing which rotatably houses the rotor, and a plurality of variable vanes annularly arranged around the rotor on the inside of the casing, the variable vane drive device of the axial-flow fluid machine comprising:

• a movable ring disposed at an outer circumferential side of the casing and having an annular shape;
• a plurality of ring support mechanisms which are disposed at intervals along a circumferential direction of the movable ring and rotatably support the movable ring around a rotor axis of the rotor;
• a rotary drive mechanism which rotates the movable ring around the rotor;
• and
• a link mechanism which connects the movable ring to the variable vane such that an angle of the variable vane is varied by rotation of the movable ring,
• wherein each of the plurality of ring support mechanisms comprises:
• an inner roller which is disposed at an inner circumferential side of the movable ring;
• an outer roller which is disposed at an outer circumferential side of the movable ring, the movable ring being sandwiched between the inner roller and the outer roller;
• and
• a roller support base, which is connected to the casing, and having an assembly including both the inner roller and the outer roller, and rotatably supports the inner roller and the outer roller around an axis parallel to the rotor in a state in which the movable ring is sandwiched between the inner roller and the outer roller and maintains contact therebetween,
• wherein the inner roller and the outer roller are disposed so as to be close to each other and along the circumferential direction of the movable ring in a state in which the movable ring is sandwiched between the inner roller and the outer roller, and
• wherein each of the plurality of ring support mechanisms has a center distance adjustment mechanism which adjusts a distance between the axis of the inner roller and the axis of the outer roller.