Device for damping vibrations of mobile turbine blades

Claim 1

A device for damping vibrations of at least first and second mobile turbine blades, in which the roots of the first and second blades are engaged in recesses distributed over the periphery of a rotor disk having a plurality of teeth, comprising: a first flange anchored under a first rim portion of said disk and which is operatively associated with a leading edge face of the disk and comprising sections that extend radially outward before the front faces of not greater than first and second adjacent blade roots; a second flange mounted under a second rim portion of said disk and which is operatively associated with a trailing edge face of said disk and comprising a single annular part, a portion of which extends radially outward a distance sufficient that the blade feet may contact it; and a shim member positioned between the root of the first blade and the bottom portion of one of said recesses in the disk, also being positioned behind the first flange, said shim member being in the shape of a wedge, which, under the action of centrifugal force, exerts on the first blade a force that causes the first blade to slide axially so as to exert a force on said second flange, wherein said second flange further comprises a first rib for contacting the root of said first blade and a second rib separated by a predetermined clearance from the trailing edge of the disk.

Claim 2

A device for damping vibrations of at least first and second mobile turbine blades, in which the roots of the first and second blades are engaged in recesses distributed over the periphery of a rotor disk having a plurality of teeth, comprising: a first flange anchored under a first rim portion of said disk and which is operatively associated with a leading edge face of the disk and comprising sections that extend radially outward before the front faces of not greater than first and second adjacent blade roots; a second flange mounted under a second rim portion of said disk and which is operatively associated with a trailing edge face of said disk and comprising a single annular part, a portion of which extends radially outward a distance sufficient that the blade feet may contact it; and a shim member positioned between the root of the first blade and the bottom portion of one of said recesses in the disk, also being positioned behind the first flange, said shim member being in the shape of a wedge, which, under the action of centrifugal force, exerts on the first blade a force that causes the first blade to slide axially so as to exert a force on said second flange, wherein said second flange further comprises a first rib for contacting the root of said first blade and a second rib separated by a predetermined clearance from the trailing edge of the disk.