Vibration damping device for blade of rotating machine and rotating machine including the same

Patent metadata

Field	Value
Publication number	US-11566526-B2
Application number	US-201917284560-A
Country	US
Kind code	B2
Filing date	Jul 25, 2019
Priority date	Nov 1, 2018
Publication date	Jan 31, 2023
Grant date	Jan 31, 2023

Abstract

A vibration damping device according to an embodiment is a vibration damping device for a blade of a rotating machine, which includes at least one housing configured to be containable in a cavity formed under a platform of the blade, and to be detachable from the blade, and an attenuation material disposed in a vibration damping space formed inside the housing.

First claim

The invention claimed is:

1. A vibration damping device for a blade of a rotating machine, the device comprising:
at least one housing configured to be containable in a cavity formed under a platform of the blade, and to be detachable from the blade; and
an attenuation material disposed in a vibration damping space formed inside the housing,
wherein the housing includes at least one wall member disposed in the vibration damping space,
wherein the wall member divides the vibration damping space into a plurality of regions which include a pair of regions facing each other across the wall member and communicating with each other,
wherein the attenuation material is configured to be movable between the pair of regions, and
wherein, in the vibration damping space, a minimum gap portion, where a distance between the at least one wall member and an inner wall surface of the housing defining the vibration damping space is minimum, is formed at a position farther away from an airfoil part of the blade than a center position of the housing in a thickness direction of the blade.

2. A rotating machine, comprising:
a blade which includes a platform and an airfoil part erected on the platform; and
the vibration damping device according to claim 1 mounted on the blade, under the platform.

3. A vibration damping device for a blade of a rotating machine, the device comprising:
at least one housing configured to be containable in a cavity formed under a platform of the blade, and to be detachable from the blade; and
an attenuation material disposed in a vibration damping space formed inside the housing,
wherein the housing includes at least one wall member disposed in the vibration damping space,
wherein the wall member divides the vibration damping space into a plurality of regions which include a pair of regions facing each other across the wall member and communicating with each other, and
wherein the attenuation material is configured to be movable between the pair of regions,
wherein, in the vibration damping space, a minimum gap portion, where a distance between the at least one wall member and an inner wall surface of the housing defining the vibration damping space is minimum, is formed, and
wherein the wall member has an inclined surface inclined with respect to the inner wall surface such that the distance between the wall member and the inner wall surface increases with distance from the minimum gap portion.

4. A vibration damping device for a blade of a rotating machine, the device comprising:
at least one housing configured to be containable in a cavity formed under a platform of the blade, and to be detachable from the blade; and
an attenuation material disposed in a vibration damping space formed inside the housing,
wherein the housing includes at least one wall member disposed in the vibration damping space,
wherein the wall member divides the vibration damping space into a plurality of regions which include a pair of regions facing each other across the wall member and communicating with each other,
wherein the attenuation material is configured to be movable between the pair of regions, and
wherein the wall member includes:
an axial wall portion extending along a chordwise direction of the blade; and
a circumferential wall portion extending along a thickness direction of the blade.

Assignees

• Mitsubishi Heavy Ind Aero Engines Ltd

Inventors

• Watanabe Toshio
• AKIMOTO Kentaro

Classifications

• F01D5/16 Primary

  for counteracting blade vibration · CPC title

• F05D2220/323

  for aircraft propulsion, e.g. jet engines · CPC title

• F05D2240/80

  Platforms for stationary or moving blades · CPC title

• F05D2260/96

  Preventing, counteracting or reducing vibration or noise · CPC title

• F01D25/06

  for preventing blade vibration (means on blade-carrying members or blades F01D5/00) · CPC title