# US 11,111,798 B2 · Turbomachine blade and method for the manufacture of same

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 11,111,798 B2
- Document ID: US11111798B2
- Status: Granted
- Kind: B2
- Application number: 16/490,115
- Filed: 2018-03-01
- Published: 2020-01-02
- Granted: 2021-09-07
- Earliest claimed: 2017-03-02
- Assignees: Safran
- Applicants: Safran
- Inventors: Nicolas Pierre Lanfant; Pierre Jean Faivre D'Arcier
- Web page: https://patentgrep.com/patent/US11111798B2

## CPC

- F01D 5/282: {Selecting composite materials, e.g. blades with reinforcing filaments}
- B29C 70/222: {the structure being shaped to form a three dimensional configuration}
- B29C 70/86: Incorporated in coherent impregnated reinforcing layers, {e.g. by winding}
- F01D 5/147: {Construction, i.e. structural features, e.g. of weight-saving hollow blades (F01D5/148, F01D5/16 and F01D5/20 take precedence; blade shape F01D5/141; blades with cooling or heating channels or cavities F01D5/18; heating, heat-insulating or cooling means on blades F01D5/18)}
- F01D 9/041: {using blades (F01D5/148 takes precedence)}
- B29B 11/16: comprising fillers or reinforcement {(non-woven fabrics per se D04H1/00, D04H3/00)}
- B29C 70/24: oriented in at least three directions forming a three-dimensional [3D] structure
- B29D 99/0025: {Producing blades or the like, e.g. blades for turbines, propellers, or wings}
- B29L 2031/08: Blades for rotors, stators, fans, turbines or the like, e.g. screw propellers
- D03D 25/005: {Three-dimensional woven fabrics}
- F05D 2220/36: specially adapted for the fan of turbofan engines
- F05D 2240/12: Fluid guiding means, e.g. vanes
- F05D 2240/80: Platforms for stationary or moving blades
- F05D 2300/603: Composites; e.g. fibre-reinforced
- F05D 2300/6033: Ceramic matrix composites [CMC]
- F05D 2300/702: Reinforcement
- F01D: NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES (machines or engines for liquids F03; non-positive displacement pumps F04D)
- B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00)
- B29B: PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29D: PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE (making granules B29B9/00; making preforms B29B11/00)
- B29L: INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- D03D: WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS

## Abstract

A blade of a turbomachine includes a blade body of composite material having a fiber reinforcement having a three-dimensional weave and densified by a matrix, the reinforcement having a first part extended by a second, end, part including two segments separated from each other; and an insert having a pi-shaped section, the insert having a platform part and two longitudinal flanges separated from each other, the platform part including a housing delimited by a bottom wall and a rim, the bottom wall including an opening communicating with the space between the two flanges, the first part of the fiber reinforcement being clamped between the two flanges of the insert, the segments of the second part of the fiber reinforcement being folded against the bottom wall of the housing.

## Claims

### Claim 1

Blade of a turbomachine comprising:
a blade body of composite material having a fiber reinforcement having a three-dimensional weave and densified by a matrix, the fiber reinforcement having a longitudinal direction corresponding to the longitudinal direction of the blade and having, in this longitudinal direction, a first part extended by a second, end, part, the second part comprising two segments separated from each other from the junction between the first and second parts to a free end of the fiber reinforcement; and
an insert having a pi-shaped section, the insert having a platform part extending perpendicularly to the longitudinal direction, and two longitudinal flanges separated from each other by a space, the platform part comprising a housing delimited by a bottom wall and a rim, the bottom wall including an opening communicating with the space between the two flanges,
the first part of the fiber reinforcement of the blade body being clamped between the two flanges of the insert, the segments of the second part of the fiber reinforcement being folded on either side of the first part against the bottom wall of the housing of the insert.

### Claim 2 (depends on 1)

The blade according to claim 1, further comprising an insert present between the segments of the second part of the fiber reinforcement at the junction between said segments.

### Claim 3 (depends on 1)

The blade according to claim 1, further comprising at least one mounting hole extending through the insert and a segment of the second part of the fiber reinforcement.

### Claim 4 (depends on 1)

The blade according to claim 1, further comprising a glue film between the fiber reinforcement of the blade body and the insert.

### Claim 5 (depends on 1)

The blade according to claim 1, wherein the fiber reinforcement of the blade body comprises carbon fibers.

### Claim 6 (depends on 1)

The blade according to claim 1, wherein the blade body matrix is an organic matrix or a ceramic matrix.

### Claim 7 (depends on 1)

The blade according to claim 1, wherein the insert is of composite material having matrix-densified fiber reinforcement.

### Claim 8 (depends on 1)

The blade according to claim 1, wherein the insert is of a metallic material.

### Claim 9 (depends on 8)

The blade according to claim 8, further comprising a ply of glass fibers between the fiber reinforcement of the blade body and the insert.

### Claim 10 (depends on 1)

The blade according to claim 1, wherein the insert is present throughout the transverse dimension of the blade body.

### Claim 11 (depends on 1)

The blade according to claim 1, comprising a plurality of inserts on the same end of the blade body.

### Claim 12 (depends on 1)

The blade according to claim 1, constituting an aeronautical outlet guide vane of a turbomachine.

### Claim 13 (depends on 1)

Aeronautical turbomachine comprising a blade according to claim 1.

### Claim 14

Method of manufacturing a turbine engine blade comprising: a blade body of composite material having a fiber reinforcement densified by a die, the blade body extending in accordance with a longitudinal direction corresponding to the longitudinal direction of the blade; and an insert having a pi-shaped section, the insert having a part of the platform extending perpendicularly to the longitudinal direction, and two longitudinal flanges separated from each other by a space, the platform part comprising a housing delimited by a bottom wall and a rim, the bottom wall comprising an opening communicating with the bottom space between the two flanges, the method comprising:
forming by three-dimensional weaving of a fiber preform intended to form the fiber reinforcement of the blade body of the blade, the preform having a longitudinal direction corresponding to the longitudinal direction of the blade to be produced and having, in this longitudinal direction, a first part extended by a second, end, part, the second part comprising two segments separated from each other from the junction between the first and the second part to a free end of the preform,
inserting the fiber preform in the opening of the insert so that the first part of the preform is sandwiched between the flanges of the insert and that the segments of the second part protrude from the bottom wall of the housing,
folding of each segment of the second part of the fiber preform on either side of the first part to fold against the bottom wall of the housing in order to obtain a blade blank,
placing of the blade blank in the cavity of a mold having the shape of the blade to be produced,
injecting a resin into the cavity of the mold in which the blade blank is present in order to impregnate the blank with resin, and
heat treating the impregnated blank in order to transform the resin and obtain the blade.

### Claim 15 (depends on 14)

The method according to claim 14, further comprising compacting the first and second parts of the fiber preform prior to insertion of the fiber preform into the opening of the insert.