CMC Laminate Pocket BOAS with Axial Attachment Scheme

• US 20200131921A1
• Filed: 10/31/2018
• Published: 04/30/2020
• Est. Priority Date: 10/31/2018
• Status: Active Grant

• Current Assignee: Rtx Corporation
• Original Assignee: United Technologies Corporation (Rtx Corporation)
• Inventors: Johnson, Dean W., Clark, Thomas E.
• Granted Patent: US 10,934,877 B2
• Time in Patent Office: Days
• CPC Class Codes: F01D 11/08 for sealing space between rotor blade tips and stator specially-shaped blade tips therefor F01D5/20
• CPC Class Codes: F01D 11/12 using a rubstrip, e.g. erodible. deformable or resiliently-biased part
• CPC Class Codes: F01D 11/14 Adjusting or regulating tip-clearance, i.e. distance between rotor-blade tips and stator casing rotors with blades adjustable in operation F01D7/00
• CPC Class Codes: F01D 25/246 Fastening of diaphragms or stator-rings
• CPC Class Codes: F01D 25/28 Supporting or mounting arrangements, e.g. for turbine casing
• CPC Class Codes: F05D 2220/32 in gas turbines
• CPC Class Codes: F05D 2230/60 Assembly methods
• CPC Class Codes: F05D 2240/11 Shroud seal segments
• CPC Class Codes: F05D 2240/55 Seals
• CPC Class Codes: F05D 2300/17 Alloys
• CPC Class Codes: F05D 2300/6033 Ceramic matrix composites [CMC]
• CPC Class Codes: Y02T 50/60 Efficient propulsion technologies, e.g. for aircraft

Abstract

An air seal assembly, comprising a control ring comprising a leading edge side and a trailing edge side opposite the leading edge side, a hook protruding axially from the trailing edge side, a clip receiver communicating through the control ring from the leading edge side to the trailing edge side, a clip mounting flange extending from the trailing edge side proximate the receiver; a blade outer air seal coupled to the control ring, the blade outer air seal comprises a body having a leading edge and a trailing edge opposite thereof, a pocket formed into the body having an upper region and a lower region, the pocket receives and engages with the hook; a notch is formed into the upper region, a shelf formed from the lower region extending axially outward from the pocket on the trailing edge side of the body; and a clip insertable into the clip receiver.

Claims

1. An air seal assembly, comprising:

a blade outer air seal control ring comprising;

a leading edge side and a trailing edge side opposite said leading edge side,

a hook protruding axially from said trailing edge side,

a clip receiver communicating through said blade outer air seal control ring from said leading edge side to said trailing edge side,

a clip mounting flange extending from said trailing edge side proximate said receiver;

a blade outer air seal coupled to said blade outer air seal control ring, said blade outer air seal comprising;

a body having a leading edge and a trailing edge opposite thereof,

a pocket formed into said body having an upper region and a lower region, said pocket configured to receive and engage with said hook;

a notch being formed into said upper region,

a shelf formed from said lower region extending axially outward from said pocket on said trailing edge side of said body; and

a clip insertable into said clip receiver and configured to engage said notch of the blade outer air seal and configured to detachably couple with said clip mounting flange.

2. The air seal assembly of claim 1, wherein said blade outer air seal comprises a ceramic matrix composite material.

3. The air seal assembly of claim 2, wherein said blade outer air seal body is formed from an assembly of ceramic plies in a pattern with overwrap braids.

4. The air seal assembly of claim 1, wherein said body further comprises a chamfer formed at each of a first end and a second end opposite thereof, wherein said chamfer is configured to facilitate a ship lap engagement along each of the first end and second end from the leading edge to the trailing edge.

5. The air seal assembly of claim 1, wherein said clip includes a biasing element configured to detachable engage said clip mounting flange and the upper region of said blade outer air seal.

6. The air seal assembly of claim 1, further comprising:

a plurality of said blade outer air seals configured to axially mount with said a blade outer air seal control ring proximate each of a plurality of hooks and respective receivers and clip mounting flanges.

7. The air seal assembly of claim 6, wherein each of said plurality of blade outer air seals are configured to be individually installed and removed from said blade outer air seal control ring.

8. The air seal assembly of claim 1, wherein said clip with said notch and said hook are configured as an anti-rotation feature to inhibit rotation of said blade outer air seal.

9. A process for a turbine engine blade outer air seal in-situ assembly and disassembly, said process comprising:

forming a blade outer air seal control ring comprising;

a leading edge side and a trailing edge side opposite said leading edge side,

a hook protruding axially from said trailing edge side,

a clip receiver communicating through said blade outer air seal control ring from said leading edge side to said trailing edge side,

a clip mounting flange extending from said trailing edge side proximate said receiver;

mounting a blade outer air seal to said blade outer air seal control ring, said blade outer air seal comprising;

a body having a leading edge and a trailing edge opposite thereof,

a pocket formed into said body having an upper region and a lower region;

a notch being formed into said upper region,

a shelf formed from said lower region extending axially outward from said pocket on said trailing edge side of said body; and

inserting a clip into said clip receiver and engaging said notch of the blade outer air seal and detachably coupling with said clip mounting flange.

10. The process according to claim 9, wherein said pocket axially receives and engages with said hook.

11. The process according to claim 9, further comprising:

individually assembling said blade outer air seal with said control ring.

12. The process according to claim 9, further comprising:

individually disassembling said blade outer air seal from said control ring.

13. The process according to claim 9, further comprising:

axially mounting said blade outer air seal onto said blade outer air seal control ring proximate each of a plurality of hooks and respective receivers and clip mounting flanges.