Abstract: A centrifugal compressor includes: a drive shaft; a wheel gear; a driven shaft; a pinion gear disposed to be rotatable together with the driven shaft, and meshing with the wheel gear; an impeller rotating together with the driven shaft; a thrust collar restricting a displacement of the driven shaft in an axial direction by colliding with the wheel gear in the axial direction; and a plurality of bolts disposed at intervals in a circumferential direction and each extending in the axial direction to fix the thrust collar and the pinion gear. Each of the plurality of bolts fix the thrust collar and the pinion gear in a state where each of the plurality of bolts are inserted from a position opposite to the wheel gear with reference to the thrust collar in the axial direction.

Abstract: A rotor includes a bolt fixing portion having a plurality of bolts for collectively fixing a plurality of impellers including a disk having a central shaft structure. The disk has a first fitting portion having a plurality of first protrusion portions and first recessed portions, a second fitting portion having a plurality of second protrusion portions and second recessed portions, and a plurality of bolt holes through which the first fitting portion and the second fitting portion pass and into which the bolt is inserted. The first protrusion portion is fitted into the second recessed portion of another adjacent impeller in a state where movement in the circumferential direction is restricted to each other, and the first recessed portion is fitted to the second protrusion portion of another adjacent impeller in a state where movement in the circumferential direction is restricted to each other.

Abstract: The impeller of a rotating machine according to at least one embodiment of the present discloser is provided with: a disc; a cover disposed on an opposite side of a radial passage from the disc in an axial direction; and a blade disposed between the disc and the cover. In a dimensionless position along a camber line of the blade when the position of a leading edge of the blade is defined as 0 and the position of a trailing edge of the blade is defined as 1, a position where an angle difference between a first blade angle at a disc-side end portion of the blade and a second blade angle at a cover-side end portion of the blade is maximum is in a range of 0.5 or more and 1 or less. The first blade angle is ?10 degrees or more and 0 degrees or less at the position where the angle difference is maximum.

Abstract: An impeller includes: a disk which is supported so as to be rotatable around an axis and which includes an outer peripheral surface expanding toward an outside in a radial direction of the disk as it goes to a downstream side in an axial direction of the axis; blades which are arranged on the outer peripheral surface of the disk at intervals in a circumferential direction of the disk; and a cover which is disposed at a position facing the outer peripheral surface of the disk so as to cover the blades. A leading edge of each of the blades includes: a straight portion which extends toward the downstream side in the axial direction of the axis as it goes to the disk from the cover; and a protrusion portion close to the disk and which is protruded from an extension of the straight portion.

Abstract: An impeller of a rotating machine according to at least one embodiment includes: a disc; a cover disposed on an opposite side of a radial passage from the disc in an axial direction; and a blade disposed between the disc and the cover. A back surface of the disc has a recess extending in a circumferential direction in a radial range where the blade is disposed.

Abstract: The impeller of a rotating machine according to at least one embodiment of the present discloser is provided with: a disc; a cover disposed on an opposite side of a radial passage from the disc in an axial direction; and a blade disposed between the disc and the cover. In a dimensionless position along a camber line of the blade when the position of a leading edge of the blade is defined as 0 and the position of a trailing edge of the blade is defined as 1, a position where an angle difference between a first blade angle at a disc-side end portion of the blade and a second blade angle at a cover-side end portion of the blade is maximum is in a range of 0.5 or more and 1 or less. The first blade angle is ?10 degrees or more and 0 degrees or less at the position where the angle difference is maximum.

Abstract: A rotary machine according to at least one embodiment is configured such that, in a region on an opposite side to a thrust collar across a key in an axial direction, a defective portion is provided on one of an outer circumferential surface of a shaft, or a surface of the shaft along a radial direction or a surface of a holding member along the radial direction, or at least a part of a section having the surface along the radial direction is formed by a material having a Young's modulus lower than a Young's modulus in another section.

Abstract: An impeller includes: a disk having a first disk member that has a tubular shape centered on an axis, and a second disk member that has a tubular shape centered on the axis and is arranged on a first side of the first disk member in a direction of the axis; a blade that is formed integrally with the second disk member; and a cover that forms a flow passage between the cover and the second disk member by covering the blade from an outer peripheral side. A recessed portion, which is recessed from the first side toward a second side in the direction of the axis, is formed in an annular-shape around the axis in the first disk member.

Abstract: An impeller of a rotating machine according to at least one embodiment includes: a disc; a cover disposed on an opposite side of a radial passage from the disc in an axial direction; and a blade disposed between the disc and the cover. A back surface of the disc has a recess extending in a circumferential direction in a radial range where the blade is disposed.

Abstract: An impeller includes a disk section having a tube section with a grip section which is fixed by thermal deformation to a rotary shaft that is configured to rotate around an axis line, and a main disk body, which is on another end in an axial direction from the grip section and which extends outward in a radial direction of the rotary shaft; and blade sections that protrude from the main disk body in the axial direction. The disk section has a hoop stress-limiting section with a tube section which extends further towards the other end in the axial direction than the main disk body.

Abstract: An impeller includes: a disk having a first disk member that has a tubular shape centered on an axis, and a second disk member that has a tubular shape centered on the axis and is arranged on a first side of the first disk member in a direction of the axis; a blade that is formed integrally with the second disk member; and a cover that forms a flow passage between the cover and the second disk member by covering the blade from an outer peripheral side. A recessed portion, which is recessed from the first side toward a second side in the direction of the axis, is formed in an annular-shape around the axis in the first disk member.

Abstract: An impeller 40 includes a disk 41 having a disk shape centered on an axis O, a plurality of blades 42 provided on a disk main surface 413 of the disk 41 facing a first side Dau in an axial direction Da at intervals in a circumferential direction around the axis O, and a cover 43 that covers the plurality of blades 42 from the first side Dau and gradually expands in diameter from the first side Dau toward a second side Dad in the axial direction. The cover 43 has a thick portion 49 at a position distant from a first end portion 431 positioned closest to the first side, the thick portion having a thickness greater than the thickness of the first end portion 431.

Abstract: An impeller includes a disk that has tubular first and second disk members, a blade that is integrally provided with the second disk member, and a cover that is integrally provided with the blade and covers the blade. The first disk member has a ring-shaped recessed portion therein. The second disk member has a ring-shaped engaging portion that is configured to engage with the first disk member by being inserted into the recessed portion. A first shrink-fitting portion is provided in a boundary portion between an outer circumferential surface of the engaging portion and an inner circumferential surface of the recessed portion that comes into contact with the outer circumferential surface.

Abstract: A centrifugal compressor includes a passage forming member being arranged in a rear side of an impeller fixed to a tip side of a rotor shaft, and forming a passage, together with a scroll member, and a casing member disposed adjacent to an opposite side of the passage forming member from the impeller along an axial direction. The passage forming member has a first protrusion, and the casing member has a second protrusion. The first protrusion and the second protrusion are fixed to each other by a bolt member inserted from an outside in a radial direction toward an inside in the radial direction.

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: An impeller includes: a disk which is supported so as to be rotatable around an axis and which includes an outer peripheral surface expanding toward an outside in a radial direction of the disk as it goes to one side in an axial direction of the axis; a plurality of blades which are arranged on the outer peripheral surface of the disk at intervals in a circumferential direction of the disk; and a cover which is disposed at a position facing the outer peripheral surface of the disk so as to cover the plurality of blades. A leading edge of the blade includes: a straight portion which extends so as to be close to one side in the axial direction from the cover toward the disk; and a scooped portion which is receded in relation to the straight portion and of which at least a portion close to the disk is formed in an arc shape when viewed from the circumferential direction.

Abstract: A turbine rotor blade assembly in which values A, CF, T, and L are set to satisfy the following expression in two-dimensional coordinates, 1.2×105?(A×CF)/(T×L)?17×105, where (A×CF)/(T×L) is an expression (1), A is an arm length [mm] of each of turbine rotor blades, CF is centrifugal force [kgf] occurring on each of the turbine rotor blades, T is a thickness [mm] of each of shrouds, and L is a lap amount [mm] of the shrouds adjacent to each other.

Abstract: In a turbine rotor blade assembly 1 of the present invention, each turbine rotor blade 10 includes a platform 11 having a blade root 12 fixed to a turbine disk 30, a profile 13 rising from the platform 11, and a shroud 14 provided at a top end of the profile 13. The shroud 14 of the present invention includes a first contact end part 15 that comes into contact with an adjacent shroud adjacent to one end side in a circumferential direction, a second contact end part 16 that comes into contact with an another adjacent shroud adjacent to the other end side in the circumferential direction, and a main body part disposed between the first and second contact end parts 15 and 16. One or both of the first and second contact end parts 15 and 16 are lower in rigidity than the main body part.

Abstract: An impeller 40 includes a disk 41 having a disk shape centered on an axis O, a plurality of blades 42 provided on a disk main surface 413 of the disk 41 facing a first side Dau in an axial direction Da at intervals in a circumferential direction around the axis O, and a cover 43 that covers the plurality of blades 42 from the first side Dau and gradually expands in diameter from the first side Dau toward a second side Dad in the axial direction. The cover 43 has a thick portion 49 at a position distant from a first end portion 431 positioned closest to the first side, the thick portion having a thickness greater than the thickness of the first end portion 431.

Abstract: An impeller is equipped with: a disk part, having a cylindrical part into which a rotary shaft that rotates around an axis line is inserted, with a portion of the cylindrical part in the axis line direction of the rotary shaft being fixed to the rotary shaft as a grip part, and a disk main body part extending from the cylindrical part outward in the radial direction of the rotary shaft a blade part protruding from the disk main body part toward a side in a first direction in the axis line direction; a reinforcing member attachment part formed on the cylindrical part closer to a side in a second direction in the axis line direction than the disk main body part; and a reinforcing member formed of material having a higher specific strength than the disk part, and attached so as to cover the reinforcing member attachment part from the outside.