JP3337243B2 - Windmill wing - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wind turbine blade applied to a wind power generator or the like.

[0002]

2. Description of the Related Art FIG. 2 is an explanatory view of a conventional wind turbine blade used for a wind power generator or the like. In the figure, the wind turbine blade is made of fiber reinforced plastics FRP and has
3, adhesive layers 4 and 5, urethane foams 6 and 7, and the like. Numerals 8 and 9 in the figure are joints between the outer skins 2 and 3. The main girder 1 which is a main strength member in such a wind turbine blade is made of glass fiber reinforced plastics GFRP.
Winding method, in which a normal glass cloth 11 and a glass mat 10 having a width of about 200 mm and a warp yarn and a weft yarn woven at the same ratio are alternately bandaged, or a glass cloth in the longitudinal direction of a windmill blade. It is manufactured by any of the hand lay-up manufacturing methods of alternately laminating 11 and the glass mat 10.

[0003]

As described above, the conventional F
The main girder 1 of the wind turbine blade made of RP has a structure in which a normal glass cloth 11 and a glass mat 10 in which warp and weft are knitted at the same ratio are alternately laminated. GFRP has a tensile strength of 10 to 20 kgf / mm ² and a tensile modulus of 100
Only about 0 to 1500 kgf / mm ² can be obtained. For example, in the case of a 250 KW wind turbine blade, the tensile strength is 12 kgf / mm
^{2. The} tensile modulus is 1200 kgf / mm ² . The wind turbine blades receive a centrifugal force due to rotation and a bending load that is repeated by rotating in response to wind. All of these load stresses are applied in the longitudinal direction of the wind turbine blade. Therefore, the main girder 1, which is a strength member of the wind turbine blade, particularly requires strength in the longitudinal direction of the wind turbine blade. In order to increase the size of the wind turbine blade to 500 KW or more, the main girder 1 is a main strength member of the wind turbine blade along with the light weight of the wind turbine blade. It is necessary to improve the strength characteristics of a certain main girder 1, especially in the longitudinal direction of the wind turbine blade.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems. In a wind turbine blade whose strength is maintained by a main girder inserted in a longitudinal direction of an outer skin, the wind turbine blade has the same structure as the main girder. A plurality of unidirectional roving cloths are laminated in the longitudinal direction, and the unidirectional roving cloths are laminated .
Glass mat and the glass cloth are configured sequentially <br/> bandage shaped to a combination laminate by laminating only one layer on the surface, the set
The laminated body is repeatedly laminated up to the required thickness of the main girder .

[0005]

That is, in the wind turbine blade according to the present invention, a plurality of unidirectional roving cloths are laminated in the longitudinal direction of the main girder of the wind turbine blade whose strength is maintained by the main girder inserted in the longitudinal direction of the outer skin. each a glass mat and glass cloth on the surface of the stack of unidirectional roving cloth
A combined laminate is formed by sequentially laminating only one layer in a bandage shape. First, the strength in the longitudinal direction of the main girder is improved by laminating a plurality of unidirectional roving cloths in the longitudinal direction of the main girder. This lamination is made of only a roving cloth and is not used with a glass mat. Next, only one layer of a normal glass mat and a glass cloth is laminated on the one-way roving cloth in a bandage shape. This lamination holds the unidirectional roving cloth which was first laminated, secures an appropriate amount of resin by using a glass mat, and secures some strength not only in the longitudinal direction of the main girder but also in the lateral direction. I do. These laminations are alternately repeated as necessary.

[0006]

FIG. 1 is an explanatory view of a wind turbine blade according to one embodiment of the present invention. In the figure, the wind turbine blade according to the present embodiment is used for a wind power generator or the like, and is made of fiber reinforced plastics FRP.
It comprises a main girder 1, outer skins 2, 3, adhesive layers 4, 5, urethane foams 6, 7, and the like. Numerals 8 and 9 in the figure are joints between the outer skins 2 and 3. The main girder 1 which is a main strength member in such a wind turbine blade occupies about 70 to 80% of the weight of the entire wind turbine blade. It is very important for weight reduction, wind turbine tower size reduction and weight reduction. The wind turbine blades receive a centrifugal force due to rotation and a bending load that is repeated by rotating in response to wind. All of these load stresses are applied in the longitudinal direction of the wind turbine blade. Therefore, the main girder 1 which is a strength member of the wind turbine blade particularly needs the strength in the longitudinal direction of the wind turbine blade, and is a main strength member of the wind turbine blade as well as the light weight of the wind turbine blade in order to increase the size of the wind turbine to 500KW class or more. It is necessary to improve the strength characteristics of the main girder 1, especially in the longitudinal direction of the wind turbine blade.

In this wind turbine blade, as shown in the figure, first, in order to improve the strength of the main girder 1 in the longitudinal direction, a one-way roving cloth containing only warp yarns and a weft yarn slightly reinforcing for holding the warp yarns. 12 are laminated in a plurality of layers in the longitudinal direction of the main girder 1. The roving cloth 12
Is suitably 2 to 6 layers, but is not limited thereto. This lamination is performed only by the roving cloth 12, and a glass mat that is usually used is not used. Next, a normal glass cloth 11 and a glass mat 1 in which warp yarns and weft yarns are knitted at the same ratio on the roving cloth 12
0 and 1 in bandage at the same time by tape winding method
Only layers are stacked. This lamination firmly holds the one-way roving cloth 12 and the glass mat 10
The purpose of the present invention is to secure an appropriate amount of resin and to secure a certain level of strength not only in the longitudinal direction of the main girder 1 but also in the lateral direction. These layers are alternately repeated to form a predetermined thickness.

A main girder made of GFRP having a conventional structure;
The main girder 1 made of GFRP in this example was laminated on an actual mold for manufacturing the main girder 1 and prototyped. The prototype main girder has a length of approximately 3m, a cross section of 250mm in major axis and 1 in minor axis.
A test piece for a tensile test was cut out from each of these main girders in an oval shape having a thickness of 50 mm and a thickness of 20 mm, and the longitudinal and lateral tensile characteristics of the main girders were examined. Table 1 shows the results.

[0009]

[Table 1]

The main girder having the conventional structure has no difference in strength characteristics between the longitudinal direction and the lateral direction, and has a tensile strength of 10 to 13 kg.
f / mm ² , and the tensile modulus was 1200 to 1500 kgf / mm ² . On the other hand, the main girder 1 according to this embodiment has a tensile strength in the longitudinal direction of 24 to 26 kgf / mm ² and a tensile modulus of 2
200 to 2600 kgf / mm ² , a transverse tensile strength of 10 to 12 kgf / mm ² , and a tensile modulus of 1200 to 15
There is a difference in strength characteristics depending on the tensile direction of 00 kgf / mm ²
The strength properties in the longitudinal direction are considerably improved. As described above, the strength of the main girder 1 is about twice as long in the longitudinal direction as compared with the main girder having the conventional structure, and it is expected that the weight of the wind turbine blade and the reliability of the strength are sufficiently improved. The strength of the main girder 1 in the lateral direction is sufficient if it has the strength characteristics shown in Table 1 and does not cause any particular problem. As a result, the size and weight of the wind turbine blade can be easily reduced, the size and weight of the wind turbine tower can be reduced, and the life and reliability of the wind turbine blade can be improved by increasing the strength.

[0011]

The wind turbine blade according to the present invention is configured as described above, and the strength of the main girder in the longitudinal direction is improved, so that the size and weight of the wind turbine blade can be easily reduced.

[Brief description of the drawings]

1A is a perspective view of a wind turbine blade according to an embodiment of the present invention, FIG. 1B is a cross-sectional view taken along line bb of FIG. 1A, and FIG. FIG. 4D is a plan view of the girder, FIG. 4D is a sectional view taken along line d-d in FIG. 4C, and FIG.
FIG. 7 is a detailed view of a portion e in FIG.

2 (a) is a perspective view of a conventional wind turbine blade, FIG. 2 (b) is a sectional view taken along line bb in FIG. 2 (a), and FIG. 2 (c).
Is a plan view of the main girder, FIG. 4D is a sectional view taken along line d-d in FIG. 4C, and FIG. 4E is a detailed view of a portion e in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main girder 2,3 Outer skin 4,5 Adhesive layer 6,7 Urethane foam 8,9 Joint 10 Glass mat 11 Glass cloth 12 One-way roving cloth

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor: Tamotsu Shimada 1-1, Akunoura-cho, Nagasaki-shi Mitsubishi Heavy Industries, Ltd. Nagasaki Shipyard (72) Inventor: Akihiro Suzuki 1-1-1, Akunoura-cho, Nagasaki-shi Mitsubishi Heavy Industries, Ltd. Inside Nagasaki Shipyard (56) References JP-A-62-282177 (JP, A) JP-A-63-168338 (JP, A) JP-A-58-81896 (JP, A) U) Actually open 60-113099 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F03D 11/00 H02K 7/18 B32B 7/02 101 B29C 70/30-70/48

Claims (1)

(57) [Claims] 1. A wind turbine blade whose strength is maintained by a main girder inserted in a longitudinal direction of a skin, wherein a plurality of unidirectional roving cloths are laminated in a longitudinal direction of the main girder and the unidirectional roving cloths are laminated. glass Ma on the surface of the
Tsu Doo and only one layer of glass cloth in each successively bandage shaped to constitute a laminated combination laminates, the the same combination laminate
Wind turbine blades characterized by being repeatedly laminated to the required thickness of the main girder .