Rotary machine

1. A rotary machine, comprising:

a rotating shaft configured to rotate around an axial line;

a plurality of rotor blades which are arranged in a peripheral direction on an outer peripheral side of the rotating shaft, and each having have a blade root attached to the rotating shaft, a platform installed on an outer side of the blade root in a radial direction, and a blade main body extending to the outer side from the platform in the radial direction; and

damper pins each Installed on an inner side of the platform in the radial direction between the rotor blades adjacent to each other,

wherein one of the platforms adjacent to each other in the peripheral direction has a first abutting surface extending in the radial direction and against which the damper pins abut, and

wherein the rotary machine further comprises:

a first moving member which is installed to be movable relative to the first damper abutting surface between the platforms adjacent to each other in the peripheral direction and on which a second damper abutting surface against which the damper pins abut is formed while a relative distance with the first damper abutting surface decreases as opposing the first damper abutting surface in the peripheral direction and approaching the outer side in the radial direction; and

a biasing member configured to bias the first moving member toward the damper pins abutting against the second damper abutting surface.

2. The rotary machine according to claim 1 ,

wherein a coefficient of friction changes in a direction in which at least one of the first damper abutting surface and the second damper abutting surface extends in a sectional view orthogonal to the axial line.

3. The rotary machine according to claim 1 ,

wherein the first moving member is installed to be movable in the peripheral direction, and

wherein the biasing member is a spring member which is installed between the other platform and the first moving member and elastically biases the first moving member to one side in the peripheral direction.

4. The rotary machine according to claim 1 ,

wherein the first moving member is installed to be movable in the radial direction, and

wherein the biasing member is a spring member which is installed between the other platform and the first moving member and elastically biases the first moving member to the inner side in the radial direction.

5. The rotary machine according to claim 1 ,

wherein the first moving member is installed to be movable in the peripheral direction, and has a pressure-receiving surface that is formed in an end portion on the other platform side and extends toward the other side in the peripheral direction as approaching the outer side in the radial direction,

wherein the other platform has an opposing surface opposite to the pressure-receiving surface in the peripheral direction, and

wherein the biasing member is capable of abutting against both the pressure-receiving surface and the opposing surface, and is movable in the radial direction.

6. The rotary machine according to claim 5 ,

wherein the biasing member has

a first sliding abutting surface slidably abutting against the pressure-receiving surface, and

a second sliding abutting surface slidably abutting against the opposing surface.

7. The rotary machine according to claim 5 ,

wherein the biasing member is a biasing damper pin extending uniformly in the axial line direction, and in which an outline having a sectional shape orthogonal to the axial line is a non-rotation target shape.

8. The rotary machine according to claim 7 ,

wherein, in the biasing damper pin, the outline having a sectional shape orthogonal to the axial line is formed of a plurality of arcs which are convex outward and have radiuses of curvature different from each other, and a plurality of line segments connecting the arcs to each other.