Patent ID: 11867066
Assignee: RTX CORPORATION
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F | IPC F

Claim 8:
9. A high pressure compressor of a gas turbine engine, comprising:
a spacer case that supports a seventh stage vane;
an outer air seal connected to the spacer case, the outer air seal including:
an axial member, the axial member extending axially from an axial front end to an axial aft end, and extending radially from a radial inner surface to a radial outer surface, the axial aft end has: a radially extending lip that is configured to seat a forward w-seal; and an axially extending lip that forms an axial aft seal;
that is thinner than the axial member and
a radial flange extends radially from the radial outer surface of the axial member, from a location intermediate the axial front end and the axial aft end of the axial member to a radial outer tip so that the outer air seal has a T-shaped cross section, and the radial flange extends axially from an axial front surface to an axial aft surface, and
mounting apertures are located in the radial flange, adjacent to the radial outer tip of the radial flange and circumferentially spaced apart from each other by a first circumferential spacing; and each of the mounting apertures has a mounting aperture diameter;
a first kerf slot defined through the axial member from the axial front end to the axial aft end and from the radial inner surface to the radial outer surface, and through the radial flange from the axial front surface to the axial aft surface, wherein a radial top end of the first kerf slot is radially spaced apart from the radial outer tip of the radial flange; and
a keyhole is defined at the radial top end of the first kerf slot, the keyhole is circular, having a keyhole diameter that is smaller than the mounting aperture diameter and the keyhole is radially centered along the radial flange, and the mounting apertures and the keyhole are radially spaced apart from each other by a first radial distance that is greater than the mounting aperture diameter,
wherein:
the spacer case is connected to the axial front surface of the radial flange of the outer air seal;
the high pressure compressor further includes an aft inner case that is connected to the axial aft surface of the radial flange of the outer air seal; and
the outer air seal is formed of a material having a higher thermal expansion coefficient than the spacer case and the aft inner case.