# US 11,905,921 B2 · Main beam for wind turbine blade and manufacturing method thereof

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- Number: US 11,905,921 B2
- Document ID: US11905921B2
- Status: Granted
- Kind: B2
- Application number: 17/795,541
- Filed: 2020-02-18
- Published: 2023-03-09
- Granted: 2024-02-20
- Earliest claimed: 2020-02-18
- Assignees: Envision Energy CO.,LTD
- Applicants: Envision Energy CO., LTD
- Inventors: Yuan Liang; Lars Overgaard; Jianxu Sun; Lei Zhuang
- Web page: https://patentgrep.com/patent/US11905921B2

## CPC

- F03D 1/0675: {of the blades}
- B29C 70/16: using fibres of substantial or continuous length {(non-woven fabrics per se D04H3/00)}
- B29C 70/52: Pultrusion, i.e. forming and compressing by continuously pulling through a die
- B29D 99/0025: {Producing blades or the like, e.g. blades for turbines, propellers, or wings}
- B29K 2307/04: Carbon
- B29K 2309/08: Glass
- B29L 2031/085: {Wind turbine blades}
- F05B 2230/30: with deposition of material
- F05B 2280/6003: Composites; e.g. fibre-reinforced
- F05B 2280/6013: Fibres
- Y02E 10/72: Wind turbines with rotation axis in wind direction
- Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product
- F03D: WIND MOTORS
- 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)
- B29D: PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE (making granules B29B9/00; making preforms B29B11/00)
- B29K: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR {MOULDS, } REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29L: INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- F05B: INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

A main beam for wind turbine blade, comprising: one or more carbon fiber pultruded bodies, wherein, each carbon fiber pultruded body comprising one or more carbon fiber pultruded sheets, the carbon fiber pultruded sheets are stacked along the thickness direction and are formed by curing a first infusion material, wherein a glass fiber infusion material is arranged between every two carbon fiber pultruded sheets; one or more inlays, which are arranged adjacent to the carbon fiber pultruded body in a direction perpendicular to the thickness direction of the main beam; one or more overlays, which cover the carbon fiber pultruded bodies and/or the inlays on both sides in the thickness direction of the main beam; and a second infusion material, which impregnates carbon fiber pultruded bodies, the inlays and the overlays.

## Claims

### Claim 1

A main beam for wind turbine blade, comprising:
one or more carbon fiber pultruded bodies, each of the one or more carbon fiber pultruded bodies comprising one or more carbon fiber pultruded sheets, the one or more carbon fiber pultruded sheets are stacked along a thickness direction of the one or more carbon fiber pultruded bodies, wherein the one or more carbon fiber pultruded sheets are formed by curing a first infusion material;
one or more inlays, which are arranged adjacent to the one or more carbon fiber pultruded bodies in a direction perpendicular to a thickness direction of the main beam;
one or more overlays, which cover the one or more carbon fiber pultruded bodies and/or the one or more inlays on both sides in the thickness direction of the main beam; and
a second infusion material, which impregnates the one or more carbon fiber pultruded bodies, the one or more inlays and the one or more overlays,
wherein the one or more carbon fiber pultruded sheets comprise a plurality of carbon fiber pultruded sheets, and a glass fiber infusion material is provided between at least two of the plurality of carbon fiber pultruded sheets,
wherein the glass fiber infusion material and the second infusion material are the same material.

### Claim 2 (depends on 1)

The main beam for wind turbine blade according to claim 1, wherein the one or more carbon fiber pultruded bodies have m of the one or more carbon fiber pultruded sheets, and the main beam has n of the one or more carbon fiber pultruded bodies, p of the one or more inlays, and q of the one or more overlays, wherein m, n, p, q are integers from 1 to 100.

### Claim 3 (depends on 1)

The main beam for wind turbine blade according to claim 1, wherein the first infusion material comprises one or more of thermosetting epoxy resin, vinyl resin, unsaturated polyester resin, phenolic resin, and thermoplastic resin.

### Claim 4 (depends on 3)

The main beam for wind turbine blade according to claim 3, wherein the thermoplastic resin comprises one or more of polypropylene resin, polyethylene resin, polyvinyl chloride resin, polystyrene resin, acrylonitrile-butadiene-styrene copolymer resin, polyamide resin, polyetheretherketone resin, and polyphenylene sulfide resin.

### Claim 5 (depends on 1)

The main beam for wind turbine blade according to claim 1, wherein each of the one or more overlays comprises glass fiber fabric or glass fiber non-woven fabric.

### Claim 6 (depends on 1)

The main beam for wind turbine blade according to claim 1, wherein each of the one or more inlays comprises one or more of the PVC foam, PET foam, PMI foam, wood, honeycomb sandwich material, glass fiber pultruded sheet, glass fiber fabric, glass fiber non-woven fabric, and glass fiber yarn,
wherein the second infusion material comprises one or more of thermosetting epoxy resin, vinyl resin, unsaturated polyester resin, phenolic resin, thermoplastic resin,
wherein the thermoplastic resin comprises one or more of polypropylene resin, polyethylene resin, polyvinyl chloride resin, polystyrene resin, acrylonitrile-butadiene-styrene copolymer resin, polyamide resin, polyetheretherketone resin, polyphenylene sulfide resin.

### Claim 7 (depends on 1)

The main beam for wind turbine blade according to claim 1, wherein the one or more inlays comprise:
a main body, the thickness d1 of which is less than or equal to the sum D of the thicknesses of the adjacent one or more carbon fiber pultruded bodies and the one or more overlays; and
a transition portion, the thickness d2 of which varies between zero and D−d1, wherein the transition portion is arranged between the main body and the adjacent one or more carbon fiber pultruded bodies to form a thickness transition.

### Claim 8 (depends on 7)

The main beam for wind turbine blade according to claim 7, wherein the cross-section of the main body is rectangular and the cross-section of the transition portion is triangular.

### Claim 9 (depends on 1)

A wind turbine, comprising the main beam for wind turbine blade according to one of claim 1.

### Claim 10

A method for manufacturing the main beam for wind turbine blade, comprising the following steps:
providing one or more carbon fiber pultruded bodies, each of the one or more carbon fiber pultruded bodies comprising one or more carbon fiber pultruded sheets, the one or more carbon fiber pultruded sheets are stacked along a thickness direction of the one or more carbon fiber pultruded bodies, wherein the one or more carbon fiber pultruded sheets are formed by curing a first infusion material, wherein the one or more carbon fiber pultruded sheets comprise a plurality of carbon fiber pultruded sheets, and a glass fiber infusion material is arranged between every two of the plurality of carbon fiber pultruded sheets;
arranging one or more inlays adjacent to the one or more carbon fiber pultruded bodies in a direction perpendicular to a thickness direction of the main beam;
arranging one or more overlays on the one or more carbon fiber pultruded bodies and/or the one or more inlays on both sides in the thickness direction of the main beam; and
impregnating the one or more carbon fiber pultruded bodies, the one or more inlays and the one or more overlays with a second infusion material.

### Claim 11 (depends on 10)

The method for manufacturing the main beam for wind turbine blade according to claim 10, wherein arranging the one or more inlays adjacent to the one or more carbon fiber pultruded bodies in the direction perpendicular to the thickness direction of the main beam comprises the following steps:
disposing a main body of the one or more inlays adjacent to the one or more fiber pultruded bodies, wherein the thickness d1 of the main body of the one or more inlays is less than the sum D of the thicknesses of the adjacent one or more carbon fiber pultruded bodies and the one or more overlays; and
arranging a transition portion of the one or more inlays between the main body of the one or more inlays and the adjacent one or more carbon fiber pultruded bodies to form a thickness transition, wherein the thickness d2 of the transition portion of the one or more inlays varies between zero and D−d1.

### Claim 12 (depends on 10)

The method for manufacturing the main beam for wind turbine blade according to claim 10, wherein arranging the one or more inlays adjacent to the one or more carbon fiber pultruded bodies in the direction perpendicular to the thickness direction of the main beam comprises the following steps:
placing the one or more inlays on both sides of each of the one or more carbon fiber pultruded bodies to form a continuous composite.

### Claim 13 (depends on 10)

The method for manufacturing the main beam for wind turbine blade according to claim 10, wherein providing the one or more carbon fiber pultruded bodies comprises the following steps:
arranging the one or more carbon fiber pultruded sheets stacked with each other along the thickness direction of the one or more carbon fiber pultruded bodies, wherein the one or more carbon fiber pultruded sheets have been impregnated and cured with the first infusion material; and
setting a glass fiber infusion layer between every two of the plurality of carbon fiber pultruded sheets for secondary infusion.