Abstract: In the centrifugal compressor, the return channel is provided between a hub-side wall surface and a shroud-side wall surface. The return channel includes a front set of vanes arranged in a circular array on the upstream side and a rear set of vanes arranged in a circular array on the downstream side. The front set of vanes and the rear set of vanes are both formed on the shroud-side wall surface. The front set of vanes is formed on an annular member that is formed separately from the rear set of vanes. The annular member is fitted to the return channel. According to the above, it is possible to improve the tangential velocity component removal ability of front and rear vanes provided in the return channel of a centrifugal compressor.

Abstract: A centrifugal compressor including: a diffuser in which a fluid flows in a centrifugal direction away from a rotary shaft; a return flow path which is provided downstream of the diffuser and in which fluid flowing in to a later-stage centrifugal impeller from the diffuser flows in a return direction back to the rotary shaft; a plurality of return vanes that are disposed in the shape of a circular vane centered on a centerline of the rotary shaft, and are installed in the return flow path; and a turning part, wherein an inlet blade angle (?) of an outlet guide vane provided to the downstream side, of the return vanes, is lying down more in the circumferential direction with respect to an inlet blade angle (?) of a inlet guide vane provided to the upstream side, of the return vanes (?<?).

Abstract: The present invention provides a centrifugal multistage compressor adapted to inhibit corrosion of an intermediate stage labyrinth. More particularly, the present invention provides a centrifugal multistage compressor adapted to inhibit carbon dioxide corrosion of the intermediate stage labyrinth.

Abstract: The present invention provides a centrifugal multistage compressor adapted to inhibit corrosion of an intermediate stage labyrinth. More particularly, the present invention provides a centrifugal multistage compressor adapted to inhibit carbon dioxide corrosion of the intermediate stage labyrinth.

Abstract: In a centrifugal fluid machine, the secondary flow loss inside an impeller is reduced and the occurrence, when the flow rate decreases, of a flow separation/stall on the shroud-side suction surface near the leading edge of each impeller blade is suppressed, thereby making it possible to maintain the operating range of the impeller. For this, at the trailing edge of each impeller blade, the trailing edge of each impeller blade is inclined so that the shroud side of the impeller blade is positioned more backward in the rotation direction than the hub side thereof as the impeller is seen from the suction direction upstream of the rotary shaft of the impeller. Also, out of two adjacent impeller blades, the shroud side of one impeller blade trailing the other impeller blade in the impeller rotation direction overlaps with the other impeller blade at around the leading edge of the one impeller blade.

Abstract: A centrifugal compressor of the present invention can be operated without degrading the efficiency of the impeller or reducing the operating range thereof even when the centrifugal compressor is operated in an environment in which a liquid likely mixes. A centrifugal compressor of the present invention includes a rotating shaft which rotates rotationally, and an impeller including a hub fixed to the rotating shaft and plural vanes fixed to the hub at a predetermined interval in a circumferential direction. The centrifugal compressor compresses a fluid by rotation of the impeller. The hub includes plural through holes penetrating the hub from a front side to a rear side of the impeller.

Abstract: A centrifugal compressor 200 used in a gas pipeline 1 has a centrifugal impeller provided with a hub and a plurality of blades. The blade angle distribution of the blade is configured such that a hub side blade angle is maximum on the side closer to a hub side leading edge than a central point of a hub side camber line, and from this part to the hub side leading edge, a hub side blade angle distribution curve is convex in a blade angle increasing direction.

Abstract: In a centrifugal fluid machine, the secondary flow loss inside an impeller is reduced and the occurrence, when the flow rate decreases, of a flow separation/stall on the shroud-side suction surface near the leading edge of each impeller blade is suppressed, thereby making it possible to maintain the operating range of the impeller. For this, at the trailing edge of each impeller blade, the trailing edge of each impeller blade is inclined so that the shroud side of the impeller blade is positioned more backward in the rotation direction than the hub side thereof as the impeller is seen from the suction direction upstream of the rotary shaft of the impeller. Also, out of two adjacent impeller blades, the shroud side of one impeller blade trailing the other impeller blade in the impeller rotation direction overlaps with the other impeller blade at around the leading edge of the one impeller blade.