초록 ▼

An assembly for a rotating composite inlet nose cone is reinforced or is repaired after having undergone delamination. The assembly strengthens the inlet nose cone and thus blacks delaminations of the inlet nose cone. In one particular embodiment, the assembly includes an outer ring that blacks dela

An assembly for a rotating composite inlet nose cone is reinforced or is repaired after having undergone delamination. The assembly strengthens the inlet nose cone and thus blacks delaminations of the inlet nose cone. In one particular embodiment, the assembly includes an outer ring that blacks delaminations in an undamaged rotating inlet nose cone. The outer ring has a higher stiffness to mass ratio than the adjacent portion of the inlet nose cone assembly. In one detailed embodiment, an inner ring is disposed inwardly of the adjacent portion of the inlet nose cone assembly. The inner ring in one detailed embodiment has a lower stiffness to mass ratio than the outer ring.

대표청구항 ▼

[ What is claimed is:] [23.] A method for repairing an inlet nose cone assembly of an axial flow rotary machine, the inlet nose cone assembly having an inlet nose cone, an aft fairing that has a first stiffness to mass ratio and that has undergone delaminations, which are of an axial length L.sub.d,

[ What is claimed is:] [23.] A method for repairing an inlet nose cone assembly of an axial flow rotary machine, the inlet nose cone assembly having an inlet nose cone, an aft fairing that has a first stiffness to mass ratio and that has undergone delaminations, which are of an axial length L.sub.d, a flange and a first circumferentially extending location, the method comprising:a) removing a length D.sub.1 from the trailing edge of the aft fairing, D.sub.1 being greater than the axial length L.sub.d of the delaminations;b) abrading the surface of the inlet nose cone and the aft fairing;c) applying a bonding medium to the inlet nose cone and the aft fairing;d) forming an outer ring from a material having a second stiffness to mass ratio that is greater than the first stiffness to mass ratio of the aft fairing, the outer ring adapted to extend forward of the first circumferentially extending location a first length, L.sub.1, and rearward of the first circumferentially extending location a second length, L.sub.2,e) applying the outer ring to the inlet nose cone and the aft fairing;f) allowing the bonding medium to cure for a length of time;g) applying an adhesive medium to the interior surface of the aft fairing and to the interior surface of the outer ring;h) forming an inner ring from a material having a third stiffness to mass ratio that is less than the second stiffness to mass ratio of the outer ring, the inner ring having a first part having a first surface, a second part having a second surface and a third part inclined outwardly from the first part to the second part connecting the first surface to the second surface, the inner ring being adapted such that the first surface contacts the aft fairing along an area A.sub.1 and the second surface is spaced radially from the first surface and contacts the outer ring along an area A.sub.2 ;i) applying the inner ring to the aft fairing and the outer ring;j) allowing the adhesive medium to cure for a length of time. [24.] An inlet nose cone assembly for an axial flow rotary machine having a working medium gas flow path and a fan rotor assembly that includes a fan rotor disk and a plurality of fan blades that extend radially across the working medium gas flowpath, the inlet nose cone assembly comprising:an inlet nose cone formed of a composite material, the inlet nose cone havingan interior surface,an exterior surface,a first circumferentially extending location,a flange extending radially inward from the first circumferentially extending location which is attached to the fan rotor disk anda plurality of holes arranged circumferentially such that the interior surface of the inlet nose cone is placed in fluid communication with the exterior surface of the inlet nose cone,an aft fairing formed of a composite material integral with the inlet nose cone, the aft fairing havingan interior surface andan exterior surface,wherein the aft fairing extends in cantilevered fashion from the first circumferentially extending location such that the working medium gases flow smoothly into the fan blades;a continuous outer ring formed of a carbon fibrous material having a higher stiffness to mass ratio than the aft fairing, the outer ring havingan interior surface,an exterior surface andcircumferentially arranged holes aligned with the circumferential holes of the inlet nose cone,wherein the interior surface of the outer ring is attached to the exterior surface of the aft fairing and the exterior surface of the inlet nose cone, the outer ring extending forward of the first circumferentially extending location a first length, L.sub.1, and rearward of the first circumferentially extending location a second length, L.sub.2, to within close proximity of the fan rotor disk such that radial deflections of the aft fairing are constrained, the outer ring being attached to the inlet nose cone and the aft fairing by a bonding medium;a continuous inner ring formed of a Kevlar fibrous material disposed between a glass fibrous material having a lower stiffness to mass ratio than the outer ring, the inner ring being in the form of a frustoconical section havinga first surface,a second surface andan inclined surface extending angularly from the first surface to the second surface,wherein the first surface is bonded to the interior surface of the aft fairing such that the bond between the aft fairing and the outer ring is held in compression and the second surface is bonded to the interior surface of the outer ring such that the bond between the second surface and the outer ring is held in compression under operative conditions.