It is an object of the present invention to provide a compressor that has a simple structure, produces a damping effect and improves aerodynamic performance. In a compressor including stator blades 4 circumferentially mounted to an inner circumferential surface side of a casing 6 forming a annular path; and an inner barrel 7 supported by the casing and arranged on the radially inside of the stator blade as a partition wall on the radial side of the annular path; the stator blade includes an outer shroud 10 mounted to an inner circumferential surface of the casing at a position facing the inner barrel, and an inner shroud 11 supporting a blade portion at an inner diameter side, the inner shroud being disposed in an annular groove formed in an outer circumferential surface of the inner barrel facing the inner shroud. The stator blade including the outer shroud 10 , the inner shroud 11 and the blade portions 9 are formed in a monolithic structure by milling.
1. A compressor comprising:
stage portions composed of stator blade rows and rotor blade rows; and
an adjusting portion configured to adjust a flow of a compressed air increased in pressure at the stage portions,
wherein the adjusting portion comprises:
outlet side stator blades circumferentially mounted to an inner circumferential surface side of a casing forming an annular path; and
an inner barrel forming a stationary body supported by the casing, and arranged radially inside of the outlet side stator blades on the outlet side of a last stage of the stage portions as a partition wall on a radial side of the annular path;
wherein the inner barrel comprises annular grooves formed circumferentially in its outer circumferential surface,
wherein the outlet side stator blades respectively include an outer shroud mounted to an inner circumferential surface of the casing at a position facing the inner barrel, and an inner shroud supporting a blade portion at an inner diameter side and facing the inner barrel, the inner shrouds being individually disposed in a space of a corresponding annular groove of the annular grooves, and each of the inner shrouds being disposed with a given gap between the inner barrel,
wherein the outlet side stator blades are continuously arranged in an axial direction,
wherein the outlet side stator blades, including the outer shroud, the inner shroud and the blade portion, are machined in a monolithic structure,
wherein a plurality of the outlet side stator blades adjacent circumferentially to each other are monolithically formed as a stator blade ring segment, and a plurality of the stator blade ring segments are mounted to the casing in the circumferential direction thereof to form a ring-shaped stator blade ring,
wherein a plurality of stator blade rings are axially arranged at a position located on the outlet side of the last stage of the stage portions and facing the inner barrel, and
wherein the inner shrouds of all of the plurality of stator blade rings are individually and entirely disposed in the corresponding annular groove and do not contact the inner barrel.