Turbine ring assembly with sealing

Patent metadata

Field	Value
Publication number	US-2016290145-A1
Application number	US-201615087195-A
Country	US
Kind code	A1
Filing date	Mar 31, 2016
Priority date	Apr 1, 2015
Publication date	Oct 6, 2016
Grant date	—

Abstract

A turbine ring assembly includes a ring support structure and a plurality of ring sectors made of CMC material and forming a turbine ring, each ring sector including an annular base with respective end portions having edges that are held facing an edge of the end portion of the annular base of a sector that is adjacent in the turbine ring. The assembly includes resilient holder devices for holding the ring sectors in position on the ring support structure, and each resilient holder device includes a spring element present beside the outside face of the ring support structure.

First claim

1 . A turbine ring assembly comprising a ring support structure and a plurality of ring sectors made of ceramic matrix composite material making up a turbine ring, each ring sector comprising an annular base with, in a radial direction of the turbine ring, an inside face defining the inside face of the turbine ring and an outside face facing the inside face of the ring support structure, each said annular base including at each circumferential end a circumferential edge that is held facing a circumferential edge of the circumferential end of the annular base of a ring sector that is adjacent in the turbine ring, wherein the assembly comprises resilient holder devices, each resilient holder device exerting a force on the circumferential ends of two adjacent ring sectors, holding said adjacent sectors in position, and wherein each resilient holder device comprises a spring element present beside the outside face of the ring support structure.

2 . An assembly according to claim 1 , further comprising a plurality of gaskets, each gasket extending axially over the circumferential ends of two adjacent sectors at the facing edges of said ends, the resilient holder devices exerting force that holds the gaskets in contact with the circumferential ends of two adjacent ring sectors.

3 . An assembly according to claim 2 , wherein:
the ring support structure comprises an upstream annular radial flange and a downstream annular radial flange between which the ring sectors are held without being attached to said flanges, each gasket having an upstream end passing through a slot formed in the upstream radial flange and a downstream end passing through a slot formed in the downstream radial flange; each ring sector presents a K-shape in a plane defined by the radial direction and the circumferential direction of the turbine ring, with tabs extending from the outside face of the annular base over the circumferential ends of said annular base, circumferential edges of the tabs and the circumferential edges of the circumferential ends of each ring sector being held respectively facing the circumferential edges of tabs and the circumferential edges of ring sectors that are adjacent in the ring; each resilient holder device exerts a force on the facing tabs of two adjacent ring sectors that is directed radially towards the outside of the turbine ring, holding the corresponding gasket in contact with the circumferential ends of two adjacent ring sectors.

4 . An assembly according to claim 3 , wherein the gaskets are constituted by strips of ceramic matrix composite material.

5 . An assembly according to claim 3 , wherein each resilient holder device comprises a bolt and a spring, the bolt having a head present between the outside face of a gasket and the tabs of two adjacent sectors, the spring being mounted in a prestressed state between a shroud of the ring support structure and a nut fastened to the end of the bolt remote from its end having the head.

6 . An assembly according to claim 2 , wherein:
the ring support structure includes tabs that extend from the inside face of a shroud, each tab including a folded-over portion; each ring sector includes tabs extending from the outside face of its annular base, each tab having a folded-over portion engaged with the folded-over portion of a tab of the ring structure; and each resilient holder device exerts a pressing force on each gasket holding the gasket in contact with the circumferential ends of two adjacent ring sectors.

7 . An assembly according to claim 6 , wherein each resilient holder device comprises a shoe in contact with the top surface of the gasket, a rod extending vertically from the outside surface of the shoe, and a spring exerting a pressing force on the free end of the rod.

Assignees

• Herakles
• Snecma

Inventors

• Roussille Clément
• Evain Gael
• Planckeel Aline
• Groleau Claire

Classifications

• F01D9/04 Primary

  forming ring or sector · CPC title

• F01D11/08

  for sealing space between rotor blade tips and stator (specially-shaped blade tips therefor F01D5/20) · CPC title

• F05D2300/6033

  Ceramic matrix composites [CMC] · CPC title

• F01D25/246 Primary

  Fastening of diaphragms or stator-rings · CPC title

• F05D2240/11

  Shroud seal segments · CPC title