US 12,292,002 B2
Casing assembly
Marcus J. George, London (GB)
Assigned to ROLLS-ROYCE PLC, London (GB)
Appl. No. 17/040,185
Filed by Rolls-Royce plc, London (GB)
PCT Filed Mar. 19, 2019, PCT No. PCT/EP2019/056794
§ 371(c)(1), (2) Date Sep. 22, 2020,
PCT Pub. No. WO2019/179993, PCT Pub. Date Sep. 26, 2019.
Claims priority of application No. 1804569 (GB), filed on Mar. 22, 2018.
Prior Publication US 2021/0010425 A1, Jan. 14, 2021
Int. Cl. F02C 7/25 (2006.01); A62C 2/06 (2006.01); A62C 2/24 (2006.01); F01D 25/24 (2006.01)
CPC F02C 7/25 (2013.01) [A62C 2/065 (2013.01); A62C 2/247 (2013.01); F01D 25/24 (2013.01); F05D 2240/14 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A casing assembly for a gas turbine engine comprising:
a casing having a circular annular cross-sectional profile extending in an axial direction and configured for surrounding components of the gas turbine engine;
electrically conductive intumescent material extending around the casing, the intumescent material being activatable in response to electrical current to expand; and
an electrical activation line extending around the casing to activate the intumescent material, the activation line extending in a pattern such that an activation area which circumscribes the activation line has an axial extent of at least 50% of an axial length of the casing and a circumferential extent of at least 50% of a circumference of an outer surface of the circular annular cross-sectional profile,
wherein the electrical activation line comprises two activation lines in a side by side relationship, the two activation lines being electrically coupled to each other via the electrically conductive intumescent material to thereby activate the intumescent material at multiple locations over a corresponding area of the casing.