Vibration damper
First Claim
1. A vibration damper for use in a turbomachine having at least one turbine rotor, the at least one turbine rotor having a plurality of radially extending blades, each blade including an aerofoil, a platform located radially inwardly of the aerofoil, and a stem located radially inwardly of the platform, the vibration damper comprising:
- a seal-region comprising a pair of sealing surfaces configured for engagement with respective contact surfaces provided on adjacent blade platforms; and
a mass-region configured to extend radially inwardly from the seal-region and to terminate at a position located between adjacent blade stems, whereinthe seal-region is shaped such that;
i) a first one of the pair of sealing surfaces lies in a substantially radial plane relative to the rotor, for engagement with a radial contact surface on one of the adjacent blade platforms, and ii) said sealing surfaces converge in a radially outward direction relative to the rotor, for engagement with similarly converging contact surfaces on the adjacent blade platforms,the platform of each rotor blade comprises a projection located substantially radially inwardly of a second contact surface to define a recess between the second contact surface and the projection,the seal-region defines a stepped region,a portion of the seal-region and the stepped region is positioned within the recess,the mass-region is shaped such that the mass-region has a greater mass on a side of the damper having the stepped region than on an adjacent side of the mass-region away from the stepped region, andthe side of the mass-region having a greater mass is positioned radially below the recess.
1 Assignment
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Accused Products
Abstract
A vibration damper (28) is disclosed for use in a turbomachine, the turbomachine comprising at least one turbine rotor (19) having a plurality of radially extending blades (16, 17). Each blade has an aerofoil (22), a platform (21) and a stem (20). The vibration damper (28) has a seal-region (29) which comprises a pair of sealing surfaces (24, 25) configured for engagement with respective contact surfaces (24, 25) provided on adjacent blade platforms (21). The vibration damper (28) also has a mass-region (30) which is configured to extend radially inwardly from the seal-region (29) and to terminate at a position located between adjacent blade stems (20) (FIG. 4).
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Citations
12 Claims
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1. A vibration damper for use in a turbomachine having at least one turbine rotor, the at least one turbine rotor having a plurality of radially extending blades, each blade including an aerofoil, a platform located radially inwardly of the aerofoil, and a stem located radially inwardly of the platform, the vibration damper comprising:
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a seal-region comprising a pair of sealing surfaces configured for engagement with respective contact surfaces provided on adjacent blade platforms; and a mass-region configured to extend radially inwardly from the seal-region and to terminate at a position located between adjacent blade stems, wherein the seal-region is shaped such that;
i) a first one of the pair of sealing surfaces lies in a substantially radial plane relative to the rotor, for engagement with a radial contact surface on one of the adjacent blade platforms, and ii) said sealing surfaces converge in a radially outward direction relative to the rotor, for engagement with similarly converging contact surfaces on the adjacent blade platforms,the platform of each rotor blade comprises a projection located substantially radially inwardly of a second contact surface to define a recess between the second contact surface and the projection, the seal-region defines a stepped region, a portion of the seal-region and the stepped region is positioned within the recess, the mass-region is shaped such that the mass-region has a greater mass on a side of the damper having the stepped region than on an adjacent side of the mass-region away from the stepped region, and the side of the mass-region having a greater mass is positioned radially below the recess. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A turbomachine comprising:
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at least one turbine rotor having a plurality of radially extending turbine blades, each blade including; an aerofoil, a platform located radially inwardly of the aerofoil, and a stem located radially inwardly of the platform, and a plurality of vibration dampers comprising; a seal-region comprising a pair of sealing surfaces configured for engagement with respective contact surfaces provided on adjacent blade platforms; and a mass-region configured to extend radially inwardly from the seal-region and to terminate at a position located between adjacent blade stems, wherein the seal-region is shaped such that a first one of the pair of sealing surfaces lies in a substantially radial plane relative to the rotor, for engagement with a radial contact surface on one of the adjacent blade platforms, and the platform of each rotor blade comprises a projection located substantially radially inwardly of a second contact surface to define a recess between the second contact surface and the projection, the seal-region defining a stepped region, a portion of the seal-region and the stepped region being positioned within the recess, the mass-region being shaped such that the mass-region has a greater mass on a side of the damper having the stepped region than on an adjacent side of the mass-region away from the stepped region, the side of the mass-region having a greater mass is positioned radially below the recess, and the plurality of vibration dampers are configured so as to have a mass-distribution such that a line of centrifugal force, acting upon each vibration damper during rotation of the rotor, passes through a mid-chord region of the second of said pair of sealing surfaces. - View Dependent Claims (9, 10, 11, 12)
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Specification