Abstract: A rotary machine includes a first flange in which a first hole portion is formed, a second flange disposed to face the first flange via an abutting surface and having a second hole portion formed therein, and a stud bolt inserted into a first hole portion and a second hole portion and fastened to a female screw of the second hole portion, wherein the thickness of the second flange is larger than the thickness of the first flange.

Abstract: A rotary machine includes: a casing; a rotor that includes a rotatable rotary shaft located inside the casing, and a plurality of stages of impellers fixed to an outer periphery of the rotary shaft; a diaphragm group including diaphragms that are respectively provided in the plurality of stages of the impellers; gas flow paths provided respectively corresponding to the impellers and through which process gas to be compressed flows; and a discharge volute connected to the gas flow paths. The discharge volute is provided to expand inward in an axis line direction of the casing.

Abstract: A rotary machine includes a casing part having a return bend part configured to reverse a flow direction of a working fluid flowing from an impeller. The casing part includes a diaphragm having a curved flow path formation surface which forms a curved surface of the return bend part and an outer casing configured to cover the diaphragm and having a concave part which is recessed from an inner circumferential surface. The outer casing has an outer flow path formation surface which forms a part of the return bend part further outward in the radial direction than the curved flow path formation surface. The diaphragm has a convex part which protrudes from an outer circumferential surface outward in the radial direction to be engaged with the concave part. A surface of the convex part in the axial direction extends from the curved flow path formation surface.

Abstract: A centrifugal compressor according to the present invention includes, as gas flow paths, diffuser flow paths into which process gas flowing from impellers to outside in a radial direction flows, curved flow paths that respectively communicate with the diffuser flow paths and change a flowing direction of the process gas from a direction toward the outside in the radial direction to a direction toward inside in the radial direction, and return flow paths that respectively communicate with the curved flow paths and cause the process gas flowing through the curved flow paths to flow into the impellers. In the present invention, the curved flow path configuring at least one of the gas flow paths is provided between a diaphragm and a flow path forming body that is provided between the diaphragm and the casing.

Abstract: A rotary machine includes: a casing; a rotor that includes a rotatable rotary shaft located inside the casing, and a plurality of stages of impellers fixed to an outer periphery of the rotary shaft; a diaphragm group including diaphragms that are respectively provided in the plurality of stages of the impellers; gas flow paths provided respectively corresponding to the impellers and through which process gas to be compressed flows; and a discharge volute connected to the gas flow paths. The discharge volute is provided to expand inward in an axis line direction of the casing.

Abstract: A casing assembly, into which a rotor rotatable around an axis is inserted, includes: a lower half casing including a lower half flange surface and a lower half accommodation recessed portion; an upper half casing including an upper half flange surface and an upper half accommodation recessed portion; a fixing portion that fixes the lower half casing and the upper half casing to each other such that, when the lower and the upper half flange surfaces make contact, the lower half accommodation recessed portion and the upper half accommodation recessed portion form an accommodation space extending about the axis; a housing disposed in the accommodation space; and a seal member disposed on an outer peripheral surface of the housing and in contact with an inner peripheral surface of the lower half accommodation recessed portion and an inner peripheral surface of the upper half accommodation recessed portion.

Abstract: A rotary machine includes a first flange in which a first hole portion is formed, a second flange disposed to face the first flange via an abutting surface and having a second hole portion formed therein, and a stud bolt inserted into a first hole portion and a second hole portion and fastened to a female screw of the second hole portion, wherein the thickness of the second flange is larger than the thickness of the first flange.

Abstract: A rotary machine includes a casing part having a return bend part configured to reverse a flow direction of a working fluid flowing from an impeller. The casing part includes a diaphragm having a curved flow path formation surface which forms a curved surface of the return bend part and an outer casing configured to cover the diaphragm and having a concave part which is recessed from an inner circumferential surface. The outer casing has an outer flow path formation surface which forms a part of the return bend part further outward in the radial direction than the curved flow path formation surface. The diaphragm has a convex part which protrudes from an outer circumferential surface outward in the radial direction to be engaged with the concave part. A surface of the convex part in the axial direction extends from the curved flow path formation surface.

Abstract: A centrifugal compressor according to the present invention includes, as gas flow paths, diffuser flow paths into which process gas flowing from impellers to outside in a radial direction flows, curved flow paths that respectively communicate with the diffuser flow paths and change a flowing direction of the process gas from a direction toward the outside in the radial direction to a direction toward inside in the radial direction, and return flow paths that respectively communicate with the curved flow paths and cause the process gas flowing through the curved flow paths to flow into the impellers. In the present invention, the curved flow path configuring at least one of the gas flow paths is provided between a diaphragm and a flow path forming body that is provided between the diaphragm and the casing.

Abstract: A casing assembly, into which a rotor rotatable around an axis is inserted, includes: a lower half casing including a lower half flange surface and a lower half accommodation recessed portion; an upper half casing including an upper half flange surface and an upper half accommodation recessed portion; a fixing portion that fixes the lower half casing and the upper half casing to each other such that, when the lower and the upper half flange surfaces make contact, the lower half accommodation recessed portion and the upper half accommodation recessed portion form an accommodation space extending about the axis; a housing disposed in the accommodation space; and a seal member disposed on an outer peripheral surface of the housing and in contact with an inner peripheral surface of the lower half accommodation recessed portion and an inner peripheral surface of the upper half accommodation recessed portion.