Mitsubishi Heavy Industries Limited

Mitsubishi Power, Ltd.

Keiichiro Miyajima

Kazuhiro Tamura

Hiroki Takeda

Takashi Maruyama

Hiroyuki Yamashita

Shohei Danno

A blade vibration monitoring device includes: a rotary machine including a rotating shaft that extends along an axis, and a plurality of moving blades having moving blade bodies that extend radially outward in a radial direction from the rotating shaft, and shrouds that are provided at tips of the moving blade bodies and are in contact with each other in a circumferential direction; and a sensor that is provided on the outside of the shroud in the radial direction to face the shroud, and is configured to detect a change in an outer circumferential surface of the shroud, in which the outer circumferential surface of the shroud includes a first surface, and a second surface which is disposed to be interposed between the first surfaces from both sides in the circumferential direction, and in which a detection signal from the sensor is different from that of the first surface.

Blade vibration monitoring device, blade vibration monitoring system, moving blade, and rotary machine

A detection device is for detecting a passage timing of a turbine blade. This detection device is provided with: a sensor including a magnet and a coil that is disposed at a position subject to magnetic flux generated by the magnet and is configured to detect an induced electromotive force based on a change in the magnetic flux accompanying passage of the turbine blade; and an analyzer configured to detect the passage timing of the turbine blade, on the basis of an integrated signal obtained by integrating a signal based on the induced electromotive force.

Detection device, rotary machine, and detection method

A steam turbine rotor blade includes a protrusion portion () which is provided on a tip end portion of a blade body (), on which a leading edge portion () is formed, in a blade height direction and protrudes from a suction-side surface () toward the leading edge portion () side, and a transition-region seal member which is provided so as to cover at least a portion of a base end-side surface of the protrusion portion () and a leading edge-side transition region, which faces the leading edge portion () side, of a connection portion between the protrusion portion () and the suction-side surface (), the transition-region seal member being formed of a material having a hardness higher than that of the blade body ().

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Yokohama, Japan

Keiichiro Miyajima