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: This impeller is equipped with: a disk section that is fixed to a rotary shaft at least at the side of a first end in a direction of the axis and extends outward in a radial direction from the side of a second end; blade sections that are disposed to protrude from the disk section toward the side of the first end; and a cover section that covers the blade sections. The disk section includes a first member and a second member that are divided from each other in the direction of the axis by a dividing plane, which is orthogonal to the axis, at an inner side in the radial direction relative to the blade sections. The first member and the second member are joined on the dividing plane.

Abstract: A compressor includes: an impeller attached to a rotation shaft; and a casing covering the impeller from the outside of the rotation shaft in a radial direction. The casing includes a plurality of stationary members that are connected to each other in an axial direction of the rotation shaft and in which a flow path-forming surface is toward the axial direction is formed. The flow path-forming surfaces of two stationary members adjacent in the axial direction face each other to form a flow path extending in the radial direction of the rotation shaft. At least one stationary member in the axial direction among the adjacent stationary members includes: a stationary member main body in which the flow path-forming surface is formed.

Abstract: There is provided a turbine rotor blade assembly in which values A, CF, T, and L are set to satisfy the following expression in two-dimensional coordinates illustrated in FIG. 5, 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: A forming method for a disk-shaped component includes: mounting a heated material on a table; applying a load to the material with a forming roll while rotating the table; forming the material into a disk shape using roll forging; and suppressing decrease in temperature of the material during forming using a heat retaining device.

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: A compressor includes: an impeller attached to a rotation shaft; and a casing covering the impeller from the outside of the rotation shaft in a radial direction. The casing includes a plurality of stationary members that are connected to each other in an axial direction of the rotation shaft and in which a flow path-forming surface is toward the axial direction is formed. The flow path-forming surfaces of two stationary members adjacent in the axial direction face each other to form a flow path extending in the radial direction of the rotation shaft. At least one stationary member in the axial direction among the adjacent stationary members includes: a stationary member main body in which the flow path-forming surface is formed.

Abstract: The impeller is provided with: a disc section equipped with a tube section, the grip section of which is fixed by thermal deformation to a rotation shaft that is rotated around the axis line, and a main disc body, which is provided on the other end in the axial direction from the grip section and which extends outward in the radial direction of the rotation shaft; and blade sections that protrude from the main disc body in the axial direction. The disc section is provided with a hoop stress-limiting section, the tube section of which extends further towards the other end in the axial direction than the main disc body.

Abstract: A forming method for a disk-shaped component includes: mounting a heated material on a table; applying a load to the material with a forming roll while rotating the table; forming the material into a disk shape using roll forging; and suppressing decrease in temperature of the material during forming using a heat retaining device.

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: The invention includes a disc-shaped disc section (30) that is attached to a rotating shaft (6), and blade sections (40) that are provided on a front surface (31) that is one side in an axial direction of the disc section (30). Balance holes (33) for attaching weight-adjusting weight members W thereto are provided at positions where the blade sections (40) are provided in a radial direction, in a rear surface (51) that is the other side in the axial direction of the disc section (30).

Abstract: Provided is the centrifugal rotary machine including: a rotor having a rotary shaft rotating around an axis and impellers rotating together with the rotary shaft; a casing surrounding the rotor from an outer peripheral side; a plurality of diaphragms stacked between the rotor and the casing in a direction of the axis and configured to define a flow channel of a fluid fed under pressure using the impellers; and the restraining members configured to restrain the diaphragms from the outer peripheral side.

Abstract: An impeller and a rotary machine include an inner diameter portion, a disk portion, a blade portion, and a cover portion. The disk portion includes a main body portion adjacent to the blade portion, and a fixing portion disposed at a radially inward side of the main body portion and fitted at a radially outward side of an outer peripheral surface of the inner diameter portion. The fixing portion is formed so as to protrude from the main body portion toward another side in an axial direction.

Abstract: A method for manufacturing a machine component includes a process of estimating post-heat-treatment strength for the intermediate form of a base material after a certain mechanical working process is performed, and a process of comparing the estimated strength with reference strength required for a final form. According to a result of the comparison, heat treatment of the base material is performed after one of the mechanical working processes is performed.

Abstract: This impeller is equipped with: a disk section that is fixed to a rotary shaft at least at the side of a first end in a direction of the axis and extends outward in a radial direction from the side of a second end; blade sections that are disposed to protrude from the disk section toward the side of the first end; and a cover section that covers the blade sections. The disk section includes a first member and a second member that are divided from each other in the direction of the axis by a dividing plane, which is orthogonal to the axis, at an inner side in the radial direction relative to the blade sections. The first member and the second member are joined on the dividing plane.

Abstract: A rotary machine includes: a shaft that rotates; a disc that has a substantially cylindrical hub fitted into the shaft and is provided so as to widen outward in a radial direction from a front end to a rear end of the substantially cylindrical hub; and an impeller having a plurality of blades provided on a surface of the disc. The substantially cylindrical hub has a tight fit section having an internal radius that is smaller than a radius of the shaft, and a loose fit section having an internal radius that is greater than the internal radius of the tight fit section. The loose fit section is provided on a front end side of the substantially cylindrical hub with respect to the tight fit section.

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.

Abstract: The invention includes a disc-shaped disc section (30) that is attached to a rotating shaft (6), and blade sections (40) that are provided on a front surface (31) that is one side in an axial direction of the disc section (30). Balance holes (33) for attaching weight-adjusting weight members W thereto are provided at positions where the blade sections (40) are provided in a radial direction, in a rear surface (51) that is the other side in the axial direction of the disc section (30).

Abstract: The impeller is provided with: a disc section equipped with a tube section, the grip section of which is fixed by thermal deformation to a rotation shaft that is rotated around the axis line, and a main disc body, which is provided on the other end in the axial direction from the grip section and which extends outward in the radial direction of the rotation shaft; and blade sections that protrude from the main disc body in the axial direction. The disc section is provided with a hoop stress-limiting section, the tube section of which extends further towards the other end in the axial direction than the main disc body.

Abstract: Provided is a rotary machine including: a shaft that rotates; a disc that has a substantially cylindrical hub fitted into the shaft and is provided so as to widen outward in a radial direction from a front end to a rear end of the hub; and an impeller having a plurality of blades provided on a surface of the disc. The hub has a tight fit section having an internal radius that is smaller than a radius of the shaft, and a loose fit section having an internal radius that is greater than the internal radius of the tight fit section. The loose fit section is provided on the front end side of the hub with respect to the tight fit section.