Abstract: A rotor machine includes a rotor which includes a recessed portion, a stator blade which includes a stator blade body and a shroud, and a fin. The recessed portion includes a recessed portion radial wall surface which extends in a radial direction, and the recessed portion radial wall surface includes a first wall surface which extends radially outward, a second wall surface which extends further radially outward than the first wall surface, and a protrusion surface which protrudes toward an upstream side in the axis direction from the first wall surface. The shroud includes a shroud radial wall surface facing a downstream side in the axis direction of the recessed portion radial wall surface, and a shroud groove portion is formed in the shroud.

Abstract: An axial flow rotating machinery includes: a rotor; a casing; a rotating-blade stage including rotating blades and a radially-outer side rotating blade ring continuing to radially outer ends of the rotating blades; and a rotating-blade side seal device configured to seal a gap between the radially-outer side rotating blade ring and the casing. The rotating-blade side seal device includes: a seal fin having an annular shape and extending toward an outer peripheral surface of the radially-outer side rotating blade ring from the casing; and a swirl brake fixed to the casing in a cavity formed at an upstream side of the seal fin. The swirl brake includes: a first plate-shaped member having a surface along a radial direction of the rotor; and a second plate-shaped member or a third plate-shaped member having a surface oblique to the radial direction of the rotor.

Abstract: A steam turbine (ST) includes a rotor (11) which is rotatable around an axis (Ar), an inner casing (21) surrounding the rotor (11) from an outer peripheral side, an outer casing (30) surrounding the rotor (11) and the inner casing (21) and defining an exhaust chamber between the inner casing (21) and the outer casing (30), the steam being exhausted to the exhaust chamber (30s), and a flow guide (27) which has a tubular shape and is installed on one end portion of the inner casing 21 in an axial direction (Da) in the exhaust chamber (30s) to guide the steam discharged from the rotor (11). The flow guide (27) has a turning surface (RA) which is connected to an outer peripheral surface (27A) and turns a fluid flowing along the outer peripheral surface (27A) toward the other side in the axial direction (Da).

Abstract: In an axial turbomachinery related to the invention, a structural body has a casing fin, a blade is provided with an upstream inclined surface that is inclined from an upstream side toward a downstream side, the structural body is provided with an upstream inclined inner wall surface that is inclined from the upstream side the downstream side, an inclination angle of the upstream inclined surface with respect to a central axis of relative rotation between the blade and the structural body is larger than an inclination angle of the upstream inclined inner wall surface with respect to the central axis, and an end position of the upstream inclined surface on a radially inner side is located radially outside an end position of the upstream inclined inner wall surface on the radially inner side.

Abstract: There is provided a rotary machine including a rotary shaft; a plurality of rotor blades extending outward from the rotary shaft in a radial direction of the rotary shaft, and are provided with gaps therebetween in a peripheral direction of the rotary shaft; a casing surrounding the rotor blades radially outside the rotor blades, and in which a recessed portion as a cavity accommodates tips of the rotor blades; a sealing portion extending from one of a bottom surface of the recessed portion and the tip of the rotor blade, and having a clearance with the other; a jet flow passage through which a fluid is jetted rearward in a rotation direction of the rotary shaft in the cavity; and a valve which is capable of switching a flow condition of the jet flow with turning the valve on an opening state and a closing state.

Abstract: An exhaust hood is provided with an inner casing, an outer casing, and a diffuser. The inner casing surrounds a rotor from the outside in a radial direction, and forms a first space in which a fluid flows in an axial direction between the rotor and the inner casing. The diffuser is provided with a bearing cone that has a diameter that gradually widens moving towards an axial downstream side and forms a cylindrical shape extending to the axial downstream side to be continuous with the outer circumferential surface of a rotor shaft that forms the first space. An end edge on the axial downstream side of the bearing cone forms an oval shape in which a distance between the axial line and a second cone end part of a second side is greater than a distance between the axial line and a first cone end part.

Abstract: A steam turbine exhaust chamber defining therein an exhaust passage through which steam having passed through a last-stage blade of a steam turbine is introduced to a condenser includes: a casing including an outer peripheral wall portion formed on an outer peripheral side of the exhaust passage; a bearing cone disposed on a radially inner side of the outer peripheral wall portion; and at least one bypass passage carrying a part of steam flowing through the exhaust passage from a high-pressure portion of the exhaust passage to a low-pressure portion of the exhaust passage or to the condenser, The at least one bypass passage includes a high-pressure-side opening formed in the bearing cone and a low-pressure-side opening facing steam having a lower pressure than steam facing the high-pressure-side opening.

Abstract: In a rotating machine, a tip shroud of a rotor blade includes a plurality of shroud outer peripheral surfaces which are provided such that radial positions of the shroud outer peripheral surfaces are located stepwise radially outward from an upstream side toward a downstream side, and a step portion which connects adjacent shroud outer peripheral surfaces to each other. The step portion includes an acute angle-forming surface which extends toward the upstream side while extending toward a radially outer side and is connected to an upstream-side end portion of the shroud outer peripheral surface located on the downstream side with an acute angle ?1.

Abstract: An exhaust casing is provided with an outer casing which communicates with a diffuser. The outer casing has a downstream side end plate defining an edge on an axially downstream side of an exhaust space, and an inclined plate connected to the downstream side end plate. The inclined plate gradually widens toward an axially upstream side toward a radially outer side. An angle of an inclined inner surface of the inclined plate with respect to a tangential line at an end on the radially outer side of an inner peripheral surface of an outer diffuser, which is an upstream side angle of the axially upstream side on the basis of the tangential line, is greater than a downstream side angle of the axially downstream side.

Abstract: There is provided a rotary machine including a rotary shaft configured to rotate around an axis; rotor blades; a casing surrounding the rotor blades radially outside the rotor blades, and in which a recessed portion accommodates tips of the rotor blades; a sealing portion extending from one of a bottom portion of the recessed portion and the tip of the rotor blade, and having a clearance with the other; and a variable breaker installed in the casing and is capable of being displaced between a protrusion position where the variable breaker protrudes into the recessed portion and an accommodation position where the variable breaker is accommodated in the casing.

Abstract: A tip shroud of a turbine rotor blade includes at least one first through hole. The first through hole includes a first opening and a second opening, the first opening penetrating the tip shroud in a radial direction so as to bring a first cavity and an inter-blade flow passage into communication. The first cavity is defined between a first seal fin and a second seal fin. The first seal fin extending in the radial direction on an outer side in a radial direction of the tip shroud, and the second seal fin extending in the radial direction at a position spaced part from the first seal fin in a direction of an axis of a rotor body. The first opening is formed at an intermediate position between the first seal fin and the second seal fin. The second opening is formed at a position facing the inter-blade flow passage.

Abstract: A steam turbine (ST) includes a rotor (11) which is rotatable around an axis (Ar), an inner casing (21) surrounding the rotor (11) from an outer peripheral side, an outer casino (30) surrounding the rotor (11) and the inner casing (21) and defining an exhaust chamber between the inner casing (21) and the outer casing (30), the steam being exhausted to the exhaust chamber (30s), and a flow guide (27) which has a tubular shape and is installed on one end portion of the inner casing 21 in an axial direction (Da) in the exhaust chamber (30s) to guide the steam discharged from the rotor (11). The flow guide (27) has a turning surface (RA) which is connected to an outer peripheral surface (27A) and turns a fluid flowing along the outer peripheral surface (27A) toward the other side in the axial direction (Da).

Abstract: There is provided a seal structure to suppress a leak flow of a working fluid from a gap between a rotating structure and a stationary structure, the rotating structure being configured to rotate in a prescribed direction about an axial center line, the stationary structure facing an outer periphery of the rotating structure in a radial direction with the gap inbetween, wherein the stationary structure has a cavity in which the rotating structure is accommodated, an inner peripheral surface of the cavity is provided with a seal fin that extends toward the axial center line and a plurality of stationary-side recesses arranged along a flow direction of the leak flow, and as compared with a first stationary-side recess disposed on a most upstream side, a second stationary-side recess disposed on an immediately downstream side of the first stationary-side recess is set to have a smaller depth dimension.

Abstract: An axial flow rotating machinery includes: a rotor; a casing; a rotating-blade stage including rotating blades and a radially-outer side rotating blade ring continuing to radially outer ends of the rotating blades; and a rotating-blade side seal device configured to seal a gap between the radially-outer side rotating blade ring and the casing. The rotating-blade side seal device includes: a seal fin having an annular shape and extending toward an outer peripheral surface of the radially-outer side rotating blade ring from the casing; and a swirl brake fixed to the casing in a cavity formed at an upstream side of the seal fin. The swirl brake includes: a first plate-shaped member having a surface along a radial direction of the rotor; and a second plate-shaped member or a third plate-shaped member having a surface oblique to the radial direction of the rotor.

Abstract: A sealing structure that seals a clearance between an outer peripheral surface of a rotor and an inner peripheral surface of a stator. The sealing structure includes: a plurality of step portions that are provided on a first surface which is one of the outer peripheral surface of the rotor and the inner peripheral surface of the stator so as to be arranged in the axial direction, and that protrude from the first surface toward a second surface which is the other of the outer peripheral surface of the rotor and the inner peripheral surface of the stator; and a seal fin that is provided on the second surface, and that forms a small clearance between a corresponding peripheral surface of the step portions. A portion in the vicinity of a tip of the seal fin in the radial direction is inclined toward the upstream side.

Abstract: A steam turbine exhaust chamber includes a casing and a bearing cone disposed in the casing. The casing has a recess provided along at least a part of a circumference of the casing on a radially outer side of a downstream end of the bearing cone and recessed downstream in an axial direction with respect to the downstream end of the bearing cone.

Abstract: In an axial turbomachinery related to the invention, a structural body has a casing fin, a blade is provided with an upstream inclined surface that is inclined from an upstream side toward a downstream side, the structural body is provided with an upstream inclined inner wall surface that is inclined from the upstream side the downstream side, an inclination angle of the upstream inclined surface with respect to a central axis of relative rotation between the blade and the structural body is larger than an inclination angle of the upstream inclined inner wall surface with respect to the central axis, and an end position of the upstream inclined surface on a radially inner side is located radially outside an end position of the upstream inclined inner wall surface on the radially inner side.

Abstract: A steam turbine includes a rotating shaft (1); a rotor blade (4) having a platform (43) and a rotor blade main body (40); a casing (2); a stationary blade (7) having a stationary blade main body (70) and a stator shroud (71); and a projecting portion (45A) that projects from the platform (43) toward a upstream side in a central axis direction (Da). The projecting portion (45A) has, on a side thereof facing a radially inner side, a guide surface (45f) that gradually inclines or curves radially inward from a base end portion (45s) on the platform (43) side to a tip end portion (45t) on an upstream side in the central axis direction (Da).

Abstract: An exhaust casing is provided with an outer casing which communicates with a diffuser. The outer casing has a downstream side end plate defining an edge on an axially downstream side of an exhaust space, and an inclined plate connected to the downstream side end plate. The inclined plate gradually widens toward an axially upstream side toward a radially outer side. An angle of an inclined inner surface of the inclined plate with respect to a tangential line at an end on the radially outer side of an inner peripheral surface of an outer diffuser, which is an upstream side angle of the axially upstream side on the basis of the tangential line, is greater than a downstream side angle of the axially downstream side.

Abstract: A tip shroud of a turbine rotor blade includes at least one first through hole. The first through hole includes a first opening and a second opening, the first opening penetrating the tip shroud in a radial direction so as to bring a first cavity and an inter-blade flow passage into communication. The first cavity is defined between a first seal fin and a second seal fin. The first seal fin extending in the radial direction on an outer side in a radial direction of the tip shroud, and the second seal fin extending in the radial direction at a position spaced part from the first seal fin in a direction of an axis of a rotor body. The first opening is formed at an intermediate position between the first seal fin and the second seal fin. The second opening is formed at a position facing the inter-blade flow passage.