Abstract: A centrifugal compressor includes an impeller, a return channel including a return vane for guiding a main stream of a fluid to be compressed by the impeller from an outer side of a main shaft of the impeller in a radial direction toward an inner side, stages of compressor units connected to a downstream side of the return channel and including a first bent channel for changing the main stream to a direction along the main shaft, and an intermediate suction channel connected to the return channel in at least one of the compressor units to merge a suctioned fluid to the main stream. The intermediate suction channel includes a chamber having a scroll shape and passing the suctioned fluid therethrough, and an inlet guide vane for guiding the suctioned fluid. The inlet guide vane is integrated with the return vane in the connected return channel.

Abstract: An impeller includes a plurality of pressurizing flow paths that are defined by a hub, a shroud, and vanes, that cause fluid to flow in from a shaft direction of a turbine shaft, that cause fluid to flow out toward an outer side in a radial direction of the turbine shaft, and that are arranged in a row in the circumferential direction of the turbine shaft. Each of the pressurizing flow paths is a through hole having an inlet and an outlet and formed penetratingly from the inlet to the outlet in a linear manner. The inlet is formed on an end surface of the impeller in the shaft direction of the turbine shaft.

Abstract: A gas turbine includes a compressor; a combustor; a turbine configured to drive a rotational shaft of the compressor using combustion gas generated by the combustor; a cooling device configured to generate cooling air by bleeding compressed air from the compressor and cooling the compressed air, and to supply the cooling air to the turbine along the rotational shaft; a pressurizing device configured to increase pressure of the cooling air; a pressurizing device diffuser configured to provide a passage continuing in a turbine circumferential direction, on the outer side in the turbine radial direction to guide the cooling air having the increased pressure to the outer side of the pressurizing device; and a manifold disposed between the pressurizing device diffuser and a plurality of turbine vanes so that a ring-shaped passage communicates with the passage in the pressurizing device diffuser and a cooling passage provided inside each turbine vane.

Abstract: A rotary machine includes a guide section formed in an annular flow path in communication with a suction volute at an inner circumferential side of the suction volute, at which a plurality of vanes are installed in a circumferential direction, and configured to guide a fluid introduced from the suction volute, and an impeller connected to the guide section in the axial direction and into which the fluid guided by the guide section is introduced, wherein the suction volute has an annular opening section in communication with the guide section at the inner circumferential side, and an inner wall surface extending from the opening section toward the axial direction impeller in the axial direction to increase a width dimension in the axial direction and connected to a partition section at an opposite side of the suction nozzle.

Abstract: A centrifugal compressor that reduces pressure loss of fluid blown out from an impeller to improve efficiency is provided. The centrifugal compressor includes: a rotary shaft 5 rotatably supported by a casing 2; an impeller 6 provided on the rotary shaft 5 for blowing out fluid sucked from a suction port 10 in a radial direction of the rotary shaft 5; a return channel 13 for reversing the fluid blown out from the impeller 6 toward an axis line L of the rotary shaft 5; and a discharge port 16 positioned on the axis line L of the rotary shaft 5 for discharging the fluid having passed through the return channel 13 in a direction along the axis line L.

Abstract: A rotary machine includes an impeller. The impeller includes a discoid disk that rotates about an axis line, blades disposed circumferentially at intervals on a surface of the disk facing one side in a direction of the axial line and that form a flow path therebetween that extends radially outward from one side in the direction of the axial line, and a cover that covers the blades from a radially outer side. The rotary machine further includes a casing that covers the impeller from the radially outer side and forms a gap between the casing and an outer surface of the cover; a seal portion provided in the gap; and a lid member.

Abstract: An impeller includes a disk formed in a disk shape about an axis, and a plurality of blades provided at intervals in a circumferential direction on one side in the axial direction of the disk. The blades define a flow path extending from one side in the axial direction toward a radial outer side and include a low-rigidity region and a high-rigidity region. The low-rigidity region has an inlet, an outlet of the extending region of the flow path, a relatively small plate thickness, and has a relatively small inclination angle with respect to the disk. The high-rigidity region adjacent to the low-rigidity region has a relatively large plate thickness, and a relatively large inclination angle with respect to the disk.

Abstract: A centrifugal compressor includes a rotation shaft that extends along an axis; an impeller that includes a disk fixed to the rotation shaft and protruding outward in a radial direction, a plurality of blades provided in a surface facing one side in an axial direction of the disk to be separated from each other in a circumferential direction, and a cover covering the blades from the one side in the axial direction; and a casing that includes a facing inner peripheral surface facing an outer peripheral surface of the cover in the impeller and covers the impeller from an outside. The facing inner peripheral surface includes a cylindrical inner peripheral surface that extends along the axis and an enlarged inner peripheral surface that is connected to another side of the cylindrical inner peripheral surface in the axial direction and extends outward in the radial direction toward the other side.

Abstract: A rotary machine includes a guide section formed in an annular flow path in communication with a suction volute at an inner circumferential side of the suction volute, at which a plurality of vanes are installed in a circumferential direction, and configured to guide a fluid introduced from the suction volute, and an impeller connected to the guide section in the axial direction and into which the fluid guided by the guide section is introduced. The suction volute has an annular opening section in communication with the guide section at the inner circumferential side, and an inner wall surface extending from the opening section toward the axial direction of the impeller in the axial direction to increase a width dimension in the axial direction and connected to a partition section at an opposite side of the suction nozzle.

Abstract: The impeller provides that when an angle made by a projection line 33 that is obtained by projecting a camber line 32 of the blade 22 onto a predetermined meridional cross section and the camber line 32 is defined as an inclination angle ?? and an inclination in a direction opposite to a rotating direction of the rotary shaft is defined to be positive, the blade 22 is formed in such a manner that the inclination angle ?? of a leading edge 22A is zero or positive on the hub 20 side and gradually increasing toward the shroud 21 and the inclination angle is gradually decreasing from the leading edge toward a trailing edge in a flow direction of the fluid.

Abstract: In order to reduce the rotating stall onset flowrate, this centrifugal compressor comprises: a vaneless diffuser (12) provided on a discharge outlet (6B) side of an impeller (6); and a fluid circulation flow path (21) having an inlet (21A) that opens into a first wall section (22) of a hub casing (2B) forming the vaneless diffuser (12) and also having an outlet (21B) that opens into a second wall section (23) of the hub casing (2B) facing a hub disk (6C) rear surface in the impeller (6). As a result of causing the first wall section (22) to protrude on to a wall section (31) side of the shroud casing (2A), the flow path width (D) of the vaneless diffuser (12) is smaller than the width (W) of the discharge outlet (6B) in the impeller (6).

Abstract: An impeller of a rotary machine, in which the direction of flow changes from an axial direction to a radial direction as it goes from the inside in the radial direction of a fluid flow passage to the outside in the radial direction thereof, includes a hub surface constituting at least a portion of the fluid flow passage. The impeller also includes a blade surface constituting at least a portion of the fluid flow passage, and a bulge that bulges toward the inside of the fluid flow passage at a corner where a pressure surface, which configures the blade surface, comes in contact with the hub surface in the vicinity of an inlet of the fluid flow passage.

Abstract: A suction casing includes a suction nozzle that introduces a fluid from an outer circumferential side to an inner circumferential side in a radial direction; and a chamber that includes a substantially doughnut-shaped space in communication with an inside of the suction nozzle on the outer circumferential side and that guides the fluid, introduced from the suction nozzle, to an inlet opening portion opening in an axial direction and disposed in a substantially annular shape. The chamber is formed so that a radial width is narrower in a circumferential direction from a joint portion in communication with the suction nozzle to an opposite side across a central axis.

Abstract: An impeller of a rotary machine, in which a direction of flow is configured to gradually change from an axial direction to a radial direction as the flow goes from an interior in the radial direction of a fluid flow passage to an exterior in the radial direction of the fluid flow passage, includes: a hub surface defining at least a portion of the fluid flow passage; a blade surface defining at least a portion of the fluid flow passage; and a bulge being disposed so as to bulge toward the interior of the fluid flow passage at a corner where the hub surface, which is located at a rear half on an outlet side of the fluid flow passage, is in contact with the blade surface.

Abstract: A rotary machine includes a guide section formed in an annular flow path in communication with a suction volute at an inner circumferential side of the suction volute, at which a plurality of vanes are installed in a circumferential direction, and configured to guide a fluid introduced from the suction volute, and an impeller connected to the guide section in the axial direction and into which the fluid guided by the guide section is introduced, wherein the suction volute has an annular opening section in communication with the guide section at the inner circumferential side, and an inner wall surface extending from the opening section toward the axial direction impeller in the axial direction to increase a width dimension in the axial direction and connected to a partition section at an opposite side of the suction nozzle.

Abstract: A rotary machine includes a guide section formed in an annular flow path in communication with a suction volute at an inner circumferential side of the suction volute, at which a plurality of vanes are installed in a circumferential direction, and configured to guide a fluid introduced from the suction volute, and an impeller connected to the guide section in the axial direction and into which the fluid guided by the guide section is introduced, wherein the suction volute has an annular opening section in communication with the guide section at the inner circumferential side, and an inner wall surface extending from the opening section toward the axial direction impeller in the axial direction to increase a width dimension in the axial direction and connected to a partition section at an opposite side of the suction nozzle.

Abstract: A sealing device includes a housing that rotatably accommodates a rotary shaft, a plurality of guide parts that extend along at least one of a radial direction and an axial direction of the rotary shaft and that impart flow velocity components in the rotation direction of the rotary shaft to fluid passing through therebetween, a partition part that connects ends of the plurality of guide parts and that serves as a partition between spaces between the plurality of guide parts and an outside space, a first seal part that is an annular protrusion extending in the radial direction, that forms a first gap with respect to the rotary shaft or the housing, and that blocks fluid flowing toward the plurality of guide parts, and a second seal part that is an annular protrusion, that forms a second gap with respect to the rotary shaft or the partition part, and that blocks fluid flowing through the outside space.

Abstract: An impeller of a rotary machine, in which the direction of flow gradually changes from an axial direction to a radial direction as it goes from the inside in the radial direction of a fluid flow passage to the outside in the radial direction thereof, includes: a hub surface constituting at least a portion of the fluid flow passage; a blade surface constituting at least a portion of the fluid flow passage; and a bulge that bulges toward the inside of the fluid flow passage at a corner where the hub surface, which is located at a rear half that is one of a front half on an inlet side of the fluid flow passage and the rear half on an outlet side thereof, comes in contact with the blade surface.

Abstract: An impeller of a rotary machine, in which the direction of flow changes from an axial direction to a radial direction as it goes from the inside in the radial direction of a fluid flow passage to the outside in the radial direction thereof, includes: a hub surface constituting at least a portion of the fluid flow passage; a blade surface constituting at least a portion of the fluid flow passage; and a bulge that bulges toward the inside of the fluid flow passage at a corner where a pressure surface, which configures the blade surface, comes in contact with the hub surface in the vicinity of an inlet of the fluid flow passage.

Abstract: A suction casing of the present invention includes: a suction nozzle that introduces a fluid from an outer circumferential side to an inner circumferential side in a radial direction; and a chamber that includes a substantially doughnut-shaped space in communication with an inside of the suction nozzle on the outer circumferential side and that guides the fluid, introduced from the suction nozzle, to an inlet opening portion opening in an axial direction and disposed in a substantially annular shape, in which the chamber is formed so that a radial width is narrower in a circumferential direction from a joint portion in communication with the suction nozzle to an opposite side across a central axis.