Abstract: The variable-speed accelerator includes an electric device, a transmission device, and a power supply portion that supplies electric power of a constant rated frequency supplied from a power supply to the electric device when the electric device is started. The electric device includes a constant-speed electric motor that rotates a constant-speed input shaft of the transmission device, and a variable-speed electric motor that functions as a generator in a generator mode and also functions as an electric motor in an electric motor mode. When starting the electric device, the power supply portion supplies the electric power generated by the variable-speed electric motor in the generator mode to the constant-speed electric motor after supplying starting power to the constant-speed electric motor and the variable-speed electric motor.

Abstract: To uniformly bring an abrasive into contact with a workpiece and to achieve desired surface roughness. A polishing tool sliding on a narrow part of the workpiece includes an abrasive retaining layer configured to allow an abrasive to be retained on a surface, and an elastic layer that is stacked on the abrasive retaining layer and is configured to press the abrasive retained in the abrasive retaining layer against the workpiece. The elastic layer is preferably elastically deformable over a sliding stroke of the polishing tool, and a driving unit that causes the polishing tool to slide on the workpiece is preferably connected to the polishing tool.

Abstract: A valve device includes a valve rod connecting a valve main body and a piston and capable of advancing and retracting in a first direction integrally with the valve main body and the piston, a rotary sleeve rotatably supported on a valve casing in a first circumferential direction around a first center axis, an operation member configured to rotate an operation shaft in a second circumferential direction, an advancing and retracting sleeve immovably fixed to the valve rod and the piston, and a stopper member configured to restrict an amount of movement of the advancing and retracting sleeve toward a first side in the first direction. The operation shaft is connected to the rotary sleeve such that a rotation of the operation shaft in the second circumferential direction can be converted into a rotation in the first circumferential direction and transmitted to the rotary sleeve.

Abstract: A compressor includes a rotation shaft which rotates around an axis, an impeller which press-feeds a fluid from one side in an axial direction toward an outward side in a radial direction by rotating together with the rotation shaft, a casing which surrounds the rotation shaft and the impeller and in which an exit flow channel for introducing a fluid press-fed from the impeller is formed, and an acoustic liner which is provided so as to face the inside of the exit flow channel in the casing. The acoustic liner has a plurality of open hole portions which are arranged with intervals therebetween, and acoustic spaces which communicate with the open hole portions and are independently provided for the respective open hole portions.

Abstract: A processing apparatus includes: an apparatus main body including a base portion that is movable and a liquid supply unit that supplies a liquid to the base portion; a chuck portion connected to the base portion and including an attachment hole that is open outward; and a processing tool detachably mounted on the chuck portion. The processing tool includes a cylinder fitted into and held by the attachment hole, a drive unit disposed inside the cylinder and including a rotating body to be rotated around a central axis by the liquid introduced from the liquid supply unit via the base portion, a rotary shaft protruding outward from an inside of the cylinder along the central axis to rotate integrally with the rotating body, and a tool portion connected to a tip of the rotary shaft.

Abstract: A rotor of a steam turbine includes a plurality of rotor blades attached to a disk portion and a key configured to restrict movement of each of the plurality of rotor blades in an axial direction. The disk portion includes a blade embedding groove and a circumferential groove. The plurality of rotor blades include a first rotor blade and a second rotor blade adjacent to the first rotor blade on one side in a circumferential direction. A platform of the first rotor blade includes an access groove communicating with the circumferential groove, and a platform of the second rotor blade includes a second side surface facing a first side surface in the circumferential direction and a key accommodating groove communicating with the access groove in the circumferential direction. A key is arranged in the circumferential groove and the key accommodating groove.

Abstract: A valve device includes: a valve box in which an inlet flow passage into which steam flows and an outlet flow passage through which the steam flows are formed, and in which a valve chamber that connects the inlet flow passage and the outlet flow passage is formed; and a plurality of valve bodies configured to regulate a flow rate of the steam flowing through the outlet flow passage by relative movement to the outlet flow passage. The valve box includes a valve box main body in which the inlet flow passage, the outlet flow passage, and an opening portion are formed, a lid portion that is attachable to and detachable from the valve box main body and closes the opening portion, and a cleaning nozzle that is disposed to penetrate through the lid portion and is configured to supply a cleaning liquid into the valve chamber from the outside.

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: A centrifugal compressor includes a rotary shaft having a plurality of impellers and a casing having an intermediate discharge port. The casing has a plurality of diaphragms, an external casing, a return flow path that guides a flow direction of a working fluid to an inner side in a radial direction, and an intermediate scroll that guides part of the working fluid discharged from the impeller in an intermediate stage to the intermediate discharge port. The intermediate scroll has a scroll flow path formed on a second side in the axial direction with respect to the return flow path, and an introduction portion connecting the return flow path and the scroll flow path, and an outer flow path forming surface of the scroll flow path is formed by a casing inner peripheral surface facing an inner side of the external casing in the radial direction.

Abstract: A design method of a center guide pin includes a step of setting a virtual center axis of a casing, a step of acquiring a center position of the center guide pin in a horizontal direction, a step of acquiring, as a first offset amount, an offset amount of the center position of the center guide pin from the virtual center axis of the casing in the horizontal direction, a step of setting a virtual center axis of a diaphragm, a step of acquiring a center position of a groove portion in the horizontal direction, a step of acquiring, as a second offset amount, an offset amount of the center position of the groove portion from the virtual center axis of the diaphragm in the horizontal direction, and a step of designing the center guide pin based on the first offset amount and the second offset amount.

Abstract: Provided is a metal laminating and modeling method including sequentially carrying out a step of laminating metal layer to form a modeled article, in which the step of laminating a metal layers includes a step of forming blocking beads that are continuous along the outer peripheral shape of the modeled article by arc welding on at least one end portion in the width direction of a target surface, on which the metal layers are to be formed, and a step of forming inner beads by arc welding with a current higher than the current in the step of forming blocking beads so as to fill a space on the inside of the blocking beads in the width direction of the target surface.

Abstract: A compressor includes: a casing that is formed in a cylindrical shape and has an opening portion that makes an inside and an outside of the casing communicate with each other at a lower portion in a vertical direction; a bundle that is accommodated inside the casing in a state of being insertable and removable in the axial direction; a first roller that is disposed at an end portion of a lower portion of the bundle and comes into contact with an inner peripheral surface of a lower portion of the casing; and a second roller that is disposed at the lower portion of the bundle at an interval from the first roller, and comes into contact with the inner peripheral surface of the lower portion of the casing.

Abstract: A geared compressor includes a drive gear, a first intermediate gear, a second intermediate gear, a first impeller and a second impeller connected to a first driven gear, and a third impeller and a fourth impeller connected to a second driven gear. When viewed from an axial direction, a drive axis of the drive gear is disposed below a first intermediate axis of the first intermediate gear, a second intermediate axis of the second intermediate gear, a first driven axis of the first driven gear, and a second driven axis of the second driven gear in a vertical direction. The first impeller has a larger outer diameter than the second impeller, the third impeller, and the fourth impeller.

Abstract: A rotor blade 32 includes a blade body 33 which has a negative-pressure surface 33a and a positive-pressure surface 33b extending in a blade height direction Z, and a platform 35 which is connected to an end portion of the blade body 33 in the blade height direction Z and extends in a circumferential direction Dc. In an end surface 35a of the platform 35 facing an axial direction Da, a convex portion 51 protruding in the axial direction Da and a concave portion 52 recessed in the axial direction Da are formed on an end surface 35a of the platform 35 facing the upstream side Dau. When viewed in the blade height direction Z, the convex portion 51 and the concave portion 52 are alternately formed in the circumferential direction Dc.

Abstract: An ammonia plant synthesis gas compressor train includes a steam turbine; and a compression unit that compresses a synthesis gas by being rotationally driven by the steam turbine. The compression unit includes a rotary shaft that rotates around an axis, and a plurality of impellers that are provided on the rotary shaft at intervals in a direction of the axis and are rotated integrally with the rotary shaft to pump a gas outward in a radial direction to compress the gas. In at least one of the impellers, a maximum operating peripheral speed at a radially outermost position of the impeller is within a range of 290 m/s to 390 m/s, a yield strength is 827 MPa or less, and a Brinell hardness is 311 or less.

Abstract: A planetary gear mechanism includes a sun gear rotatable about an axis, a first shaft that is fixed to the sun gear and is rotatable integrally with the sun gear, a plurality of planetary gears that mesh with the sun gear and are rotatable about a center line thereof parallel to the axis, an internal gear that includes internal teeth facing inside in a radial direction to mesh with the planetary gears and is rotatable about the axis, a second shaft that extends in the axial direction to be connected to the internal gear and rotates about the axis together with the internal gear, and a reinforcing member that is fixed to an outer peripheral surface of the internal gear and is formed in an annular shape of a material having a higher specific strength than that of a material forming the internal gear.

Abstract: A centrifugal compressor includes: an impeller which is allowed to rotate around an axis; a casing in which the impeller is accommodated and a guide flow path guiding fluid to the impeller is formed; and a guide vane which is disposed in the guide flow path and is extended from a hub side wall surface of the guide flow path, which is continued to a hub side of the impeller, to a shroud side wall surface of the guide flow path to a shroud side of the impeller, wherein the guide vane is twisted forward the impeller in a rotating direction thereof as close to the shroud side wall surface from the hub side wall surface.

Abstract: The present invention provides a method for manufacturing a variable speed accelerator including: a preparation step of preparing a variable speed electric motor 71 including a variable speed rotor 72 in which a shaft insertion hole 74 extending in a horizontal direction is formed, a first variable speed rotor bearing 85i and a second variable speed rotor bearing 85o that rotatably support the variable speed rotor 72 by aligning an axial direction of the variable speed rotor 72 in the horizontal direction, and a variable speed stator 86 that surrounds the variable speed rotor 72 from an outer circumferential side; and a shaft insertion step of inserting a constant speed shaft 77 into the shaft insertion hole 74 of the variable speed rotor 72 in the horizontal direction so as to penetrate the variable speed rotor 72 after the preparation step.

Abstract: A tilting pad bearing includes a plurality of pads slidably supporting an outside surface of a rotor shaft, a housing covering the plurality of pads, a support portion swingably supporting the pad with respect to the housing, and a fluid supply unit configured to supply a fluid to a pad surface. The support portion includes a pivot having a pad support surface in contact with a pad outside surface and a pivot curved surface curved facing and protruding toward a side opposite to the pad support surface, a liner having a first liner surface in contact with the pivot curved surface, and a biasing member biasing the liner toward the pivot with respect to the housing.