Abstract: The present invention aims at providing a technique for providing a stepped structure separately to a rotating shaft in a later step of assembly for preventing oil leakage from a bearing box. To this end, the rotating machine of the present invention includes a rotating shaft having a rotating member, a bearing device including a rotating shaft insertion hole larger in diameter than the rotating shaft, an oil thrower provided between an outer circumferential portion of the rotating shaft insertion hole and the rotating shaft, and an additional ring attached to the rotating shaft between the oil thrower and the rotating shaft such as to protrude in a radial direction of the rotating shaft.

Abstract: A hydraulic detachable coupling, which can transmit rated torque in a manner stable to vibrations, and can fully withstand abnormal torque. For this purpose, in a hydraulic detachable coupling (4) mounted detachably on a rotor (1) of a steam or gas turbine or other machine, a coupling sleeve (4b), which is fitted on a shaft end portion of a casing penetrating shaft (2) in the rotor (1), includes a taper hole portion (4b-a) which is interference-fitted on a taper shaft portion (2a) of the shaft end portion by a hydraulic pressure, and a straight hole portion (4b-b) having teeth (13) engaging a plurality of teeth (12) formed in a straight shaft portion (2b) of the shaft end portion, the taper hole portion (4b-a) and the straight hole portion (4b-b) being located adjacent to each other.

Abstract: An inner shroud portion and an outer shroud portion dividedly formed per stationary blade are formed integrally with each stationary blade. A plurality of the stationary blades adjacent to each other in a circumferential direction are coupled together by a band member at the outer shroud portions. The inner shroud portions are held between seal holders which are formed as two divided members in the flowing direction of a working fluid, which are fastened by a bolt, and which have a length corresponding to the plurality of the stationary blades. The plurality of stationary blades, the inner and outer shroud portions, the band member, and the seal holders assembled in this manner constitute a unit. A plurality of the units are connected in the circumferential direction to constitute a stationary blade ring of an axial compressor.

Abstract: A turbine blade and a gas turbine are provided in which the velocity of cooling fluid at the inlet of a pin fin region is improved so that the cooling performance at the trailing edge of the turbine blade can be improved.

Abstract: A casing includes an upper casing and a lower casing jointed in a dividable manner, and a sealing structure that suppresses outward leakage of gas from a joint area between the upper casing and the lower casing. The casing 1 also includes: an upper protruding element that protrudes from an outer circumference of the upper casing; a lower protruding element that protrudes from an outer circumference of the lower casing; and an intermediary member that is arranged on outer circumferences of the upper protruding element and the lower protruding element. The joint area between the upper casing and the lower casing is extended by the upper protruding element and the lower protruding element, and the intermediary member is welded to the upper protruding element and the lower protruding element, at a position offset from the joint area.

Abstract: A hydraulic detachable coupling, which can transmit rated torque in a manner stable to vibrations, and can fully withstand abnormal torque. For this purpose, in a hydraulic detachable coupling (4) mounted detachably on a rotor (1) of a steam or gas turbine or other machine, a coupling sleeve (4b), which is fitted on a shaft end portion of a casing penetrating shaft (2) in the rotor (1), includes a taper hole portion (4b-a) which is interference-fitted on a taper shaft portion (2a) of the shaft end portion by a hydraulic pressure, and a straight hole portion (4b-b) having teeth (13) engaging a plurality of teeth (12) formed in a straight shaft portion (2b) of the shaft end portion, the taper hole portion (4b-a) and the straight hole portion (4b-b) being located adjacent to each other.

Abstract: A turbine rotor is provided with a torque transfer mechanism equipped between a pair of adjacent rotor discs among a plurality of rotor discs so as to transfer a torque from one rotor disc to another rotor disc. The torque transfer mechanism is provided with a first groove having a semi-circle in cross section formed on a first contact face of one rotor disc, and a second groove having a semi-circle cross section formed on a second contact face of another rotor disc, and a torque pin inserted into cylindrical holes formed by combining the first grooves and the second grooves. The flange of the torque pin has long sides and short sides, and the length of the short sides is shorter than the width of an binary flange receiving plane formed by a pair of outer circumference planes of adjacent two rotor disc along the circumferential direction, and the long side of the flange has a longer length than the width of the binary flange receiving plane.

Abstract: Adjustment of the distance between the tip of a pickup section and the outer surface of a shaft of a rotor can be carried out easily and with high precision.

Abstract: There is provided a fastening device in which the tightening load at the engaged portion between the thread of a nut and the thread of a bolt can be made uniform along the length of the threads, the circumferential load distribution at the end of the engagement of the bolt can also be made uniform, and concentration of a stress in the vicinity of the beginning of the engagement can be reduced. The fastening device includes an object to be fastened, having a nut hole; a nut having, at one end, a female screw portion to be fitted in the nut hole and configured such that the center of gravity is located in the nut hole; and a bolt having, at one end, a male screw portion to be screwed into the female screw portion.

Abstract: The present invention provides a centering mechanism capable of improving the efficiency of centering work and reducing the work time and the cost. The centering mechanism centers an inner member located inside in a radial direction, with respect to an outer member arranged to surround the inner member in a circumferential direction, and includes a vertical-direction positioning unit which positions the inner member in a vertical direction in a non-stepwise manner.

Abstract: There is provided a gas turbine capable of improving the durability of a main shaft by absorbing the deformation of a casing due to heat and pressure and suppressing stresses acting on the main shaft. A link plate 31 of a movable supporting leg 30 that supports a casing 26 of a gas turbine 20 on the turbine 24 side is installed beforehand in an inclined manner at an angle ?1, whereby the displacement X of a lower casing 26L in the height direction; which occurs between a pin 31a in a top end portion of the link plate 31 and a top surface of a lower casing 26L when the operation status of the gas turbine 20 shifts from a stop condition to an operating condition is compensated for. This prevents a main shaft 25 from changing in the height direction in the part of the movable supporting leg 30 and suppresses bending stresses acting on the main shaft 25.

Abstract: The present invention aims at providing a technique for providing a stepped structure separately to a rotating shaft in a later step of assembly for preventing oil leakage from a bearing box. To this end, the rotating machine of the present invention includes a rotating shaft having a rotating member, a bearing device including a rotating shaft insertion hole larger in diameter than the rotating shaft, an oil thrower provided between an outer circumferential portion of the rotating shaft insertion hole and the rotating shaft, and an additional ring attached to the rotating shaft between the oil thrower and the rotating shaft such as to protrude in a radial direction of the rotating shaft.

Abstract: A turbine blade and a gas turbine are provided in which the velocity of cooling fluid at the inlet of a pin fin region is improved so that the cooling performance at the trailing edge of the turbine blade can be improved.

Abstract: The present invention provides a centering mechanism capable of improving the efficiency of centering work and reducing the work time and the cost. The centering mechanism centers an inner member located inside in a radial direction, with respect to an outer member arranged to surround the inner member in a circumferential direction, and includes a vertical-direction positioning unit which positions the inner member in a vertical direction in a non-stepwise manner.

Abstract: A turbine rotor is provided with a torque transfer mechanism equipped between a pair of adjacent rotor discs among a plurality of rotor discs so as to transfer a torque from one rotor disc to another rotor disc. The torque transfer mechanism is provided with a first groove having a semi-circle in cross section formed on a first contact face of one rotor disc, and a second groove having a semi-circle cross section formed on a second contact face of another rotor disc, and a torque pin inserted into cylindrical holes formed by combining the first grooves and the second grooves. The flange of the torque pin has long sides and short sides, and the length of the short sides is shorter than the width of an binary flange receiving plane formed by a pair of outer circumference planes of adjacent two rotor disc along the circumferential direction, and the long side of the flange has a longer length than the width of the binary flange receiving plane.

Abstract: There is provided a gas turbine capable of improving the durability of a main shaft by absorbing the deformation of a casing due to heat and pressure and suppressing stresses acting on the main shaft. A link plate 31 of a movable supporting leg 30 that supports a casing 26 of a gas turbine 20 on the turbine 24 side is installed beforehand in an inclined manner at an angle ?1, whereby the displacement X of a lower casing 26L in the height direction; which occurs between a pin 31a in a top end portion of the link plate 31 and a top surface of a lower casing 26L when the operation status of the gas turbine 20 shifts from a stop condition to an operating condition is compensated for. This prevents a main shaft 25 from changing in the height direction in the part of the movable supporting leg 30 and suppresses bending stresses acting on the main shaft 25.

Abstract: A hydraulic detachable coupling, which can transmit rated torque in a manner stable to vibrations, and can fully withstand abnormal torque, is provided. For this purpose, in a hydraulic detachable coupling (4) mounted detachably on a rotor (1) of a steam or gas turbine or other machine, a coupling sleeve (4b), which is fitted on a shaft end portion of a casing penetrating shaft (2) in the rotor (1), includes a taper hole portion (4b-a) which is interference-fitted on a taper shaft portion (2a) of the shaft end portion by a hydraulic pressure, and a straight hole portion (4b-b) having teeth (13) engaging a plurality of teeth (12) formed in a straight shaft portion (2b) of the shaft end portion, the taper hole portion (4b-a) and the straight hole portion (4b-b) being located adjacent to each other.

Abstract: A casing includes an upper casing and a lower casing jointed in a dividable manner, and a sealing structure that suppresses outward leakage of gas from a joint area between the upper casing and the lower casing. The casing 1 also includes: an upper protruding element that protrudes from an outer circumference of the upper casing; a lower protruding element that protrudes from an outer circumference of the lower casing; and an intermediary member that is arranged on outer circumferences of the upper protruding element and the lower protruding element. The joint area between the upper casing and the lower casing is extended by the upper protruding element and the lower protruding element, and the intermediary member is welded to the upper protruding element and the lower protruding element, at a position offset from the joint area.

Abstract: Adjustment of the distance between the tip of a pickup section and the outer surface of a shaft of a rotor can be carried out easily and with high precision.

Abstract: There is provided a fastening device in which the tightening load at the engaged portion between the thread of a nut and the thread of a bolt can be made uniform along the length of the threads, the circumferential load distribution at the end of the engagement of the bolt can also be made uniform, and concentration of a stress in the vicinity of the beginning of the engagement can be reduced. The fastening device includes an object to be fastened, having a nut hole; a nut having, at one end, a female screw portion to be fitted in the nut hole and configured such that the center of gravity is located in the nut hole; and a bolt having, at one end, a male screw portion to be screwed into the female screw portion.