JPH07279818A - Windmill blade - Google Patents

Abstract

PURPOSE:To reduce the weight of a windmill blade and to prevent water from entering an inner part even when the casing of the outermost layer is broken by forming a casing, which is configured in the shape of a blade outside a main beam, in a sandwich structure in which a plastic foaming member is sandwiched between fiber reinforced plastic materials. CONSTITUTION:A windmill blade is used for a wind power generation, etc., and formed of a casing 1 formed in the shape of a blade and a main beam 3 mainly serving as a strength member or the like and an intermediate filling material is saved. A fiber reinforced plastic FRP or a glass fiber reinforced plastic GFRP is used for the casing 1 and the main beam 3 in order to reduce weight and increase strength. Since the windmill blade has a blade structure capable of meeting a large blade, it comprises the main beam 3 made of the ERP which is basically the strength member and the casing 1 made of the FRP which forms a blade shape. The casing 1 is formed in a sandwich structure in which a plastic foaming material 1c is sandwiched by an FRP casing 1a and an FRP casing 1b.

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 wind power generation and the like.

[0002]

2. Description of the Related Art FIG. 2 is an explanatory view of a conventional wind turbine blade used for wind power generation or the like. In the figure, a conventional wind turbine blade is composed of an outer skin 01 that forms a blade shape, a main girder 03 that mainly serves as a strength member, and a plastic foam such as urethane foam that forms an intermediate filling material 04. Fiber reinforced plastic FRP is used for the outer cover 01 and the main girder 03 in order to reduce the weight and increase the strength. In addition, reference numeral 0 in the drawing
6 is an adhesive layer made of glass fiber reinforced plastic, 08 is a leading edge (leading edge), and 09 is a trailing edge (trailing edge).

[0003]

As described above, the conventional wind turbine blades used in wind power generation (250 KW class and blade length of about 12 m) are mainly made of FRP, which is a strength material. It is composed of main girder 3, FRP outer skin 01 that forms the wing shape, and plastic foam that does not buckle the outer skin 01 without intermediate filler 04, but wind power generation is a clean energy source. There is a strong demand for larger wind turbine generators in order to increase power generation efficiency. Therefore, for example, in the case of a 400 to 500 KW class wind turbine, the length of the wind turbine blade is about 18 m, and the weight exceeds 2000 kg with the conventional material and structure, and a wind turbine generator such as a shaft system, speed reducer, or tower. This has led to an overall increase in weight and cost.

Further, there is a problem of damage and repair of the wind turbine blade, and the conventional wind turbine blade has an FRP skin 0 having a plate thickness of about 2 to 4 mm.
1 and thick FRP main girder 03 mainly used as a strength member
And an intermediate filling material 04 made of a plastic foam that connects the two. However, in this structure, when a foreign material flies to the FRP outer cover 01 and collides with it and the FRP outer cover 01 is damaged, the inside is almost Is difficult to repair because it is a plastic foam, and when it is operated for a long time with the outer skin 01 being damaged, moisture penetrates inside and the material deteriorates,
There is a problem such as causing imbalance in weight.

[0005]

SUMMARY OF THE INVENTION A wind turbine blade according to the present invention is intended to solve the above-mentioned problems, and in a wind turbine blade having an outer skin forming a blade shape on the outside of a main girder, the outer skin is made of plastic foam. It is characterized by a sandwich structure in which is sandwiched between fiber reinforced plastics.

[0006]

That is, in the wind turbine blade according to the present invention, the outer skin of the wind turbine blade having the outer skin forming the blade shape on the outer side of the main girder has a sandwich structure in which the plastic foam is sandwiched between the fiber-reinforced plastics. As a sandwich structure in which a plastic foam is sandwiched between fiber reinforced plastics, the strength and rigidity of the outer skin is improved, and by using the outer skin as a part of the strength member, an intermediate filler is not required and the thickening of the main girder is suppressed and the wind turbine blade The weight can be reduced. Further, even if the outermost fiber-reinforced plastic skin is damaged, the inner-layer fiber-reinforced plastic skin prevents water from entering the inside and also serves as an auxiliary plate during repair.

[0007]

1 is an explanatory view of a wind turbine blade according to an embodiment of the present invention. In the figure, the wind turbine blade according to the present embodiment is used for wind power generation or the like, and is composed of an outer skin 1 forming a blade shape, a main girder 3 mainly serving as a strength member, and the like, and an intermediate filler is omitted. Fiber reinforced plastic FRP or glass fiber reinforced plastic GFRP is used for the outer cover 1 and the main girder 3 in order to reduce the weight and increase the strength. Further, as shown in the figure, since the wind turbine blade has a blade structure that can be used as a large blade, basically, the main girder 3 made of FRP, which is a strength member, and the outer skin 1 made of FRP, which forms the blade shape.
The outer skin 1 is a sandwich structure of the FRP outer skin 1a, the plastic foam 1c, and the FRP outer skin 1b to improve the strength and rigidity of the outer skin 1, and is used as a part of the strength member and the outermost layer of the FRP outer skin. When 1a is damaged, the inner FRP skin 1b serves as a water invasion prevention plate, and also serves as an auxiliary plate during repair.

For conventional wind turbine blades (250 KW class and length of about 12 m) used for wind power generation, etc., a main girder made of FRP mainly used as a strength material and an FRP made of a blade shape are formed. It is composed of an outer skin and a plastic foam that does not buckle the outer skin with an intermediate filler.
Wind power generation is drawing attention as clean energy, and there is a strong demand for upsizing of wind power generators in order to increase power generation efficiency. Therefore, for example, 400-500KW
In the case of a class-class wind turbine, the length of the wind turbine blade is about 18 m, and the weight exceeds 2000 kg with the conventional materials and structure, increasing the weight of the entire wind turbine generator such as the shaft system, speed reducer and tower, and further reducing the cost. It has been passed up. In addition, there is a problem of damage and repair of the wind turbine blade, and the conventional wind turbine blade connects the FRP outer shell with a plate thickness of about 2 to 4 mm, the thick FRP main girder mainly used as a strength member, and both. It is composed of an intermediate filler made of plastic foam, but with this structure, when foreign matter flies into the FRP outer skin and collides with it and the FRP outer skin is damaged, most of the inside is plastic foam and repaired. It is difficult for the wind turbine blade to operate, and if it is operated for a long period of time with the outer skin being damaged, there is a problem such as moisture entering inside, causing material deterioration, weight imbalance, etc. The structure is a sandwich structure of FRP, plastic foam, and FRP to improve the strength and rigidity of the outer cover 1, and by using it as a part of the strength member, no filler is required and the main girder is kept thick and lightweight. We are working to. Also, the outermost FRP outer skin 1
Even if a is damaged, the FRP of the inner layer 1c prevents moisture from entering the inside and also serves as an auxiliary plate at the time of repair. In addition, the conventional wind turbine blade basically uses the main girder as the main strength member, and the main girder bears 80% of the load. Therefore, the weight of the main girder accounts for 80% or more of the total weight of the wind turbine blade and is lightened. However, as shown in the table below, the weight of a conventional FRP wind turbine blade for a 250KW wind turbine (12m in length) is about 1050kg,
As a result of trial production of this wind turbine blade, the total weight is about 600 kg and 40
We were able to achieve a weight reduction of just over%.

[0009]

[Table 1]

As described above, the present wind turbine blade can be reduced in weight, and as a result, the entire wind turbine generator can be reduced in weight and cost can be reduced. In addition, even if the outermost skin of the wind turbine blade is damaged, the inner skin can prevent moisture from entering the inside and also serve as an auxiliary plate during repair, which extends the life of the wind turbine blade and facilitates repair. become.

[0011]

The wind turbine blade according to the present invention is constructed as described above, and the weight of the wind turbine blade can be reduced.
The entire wind turbine generator is lightened and the cost is reduced. Also, even if the outermost skin is damaged, the inner skin prevents moisture from entering the inside and serves as an auxiliary plate during repair, which makes it easier to repair the wind turbine blades and deteriorates the material.
Weight imbalance is prevented.

[Brief description of drawings]

FIG. 1 (a) is a front view of a wind turbine blade according to an embodiment of the present invention, FIG. 1 (b) is a sectional view taken along line BB in FIG. 1 (a), and FIG. It is sectional drawing of the outer skin.

FIG. 2 (a) is a front view of a conventional wind turbine blade, and FIG. 2 (b) is a sectional view taken along the line BB in FIG. 2 (a).

[Explanation of symbols]

 1 Outer Skin 1a FRP Outer Skin 1b FRP Outer Skin 1c Plastic Foam 3 Main Girder 5 Adhesive Layer 8 Leading Edge (Leading Edge) 9 Rear Edge (Trailing Edge)

Claims (1)

[Claims] 1. A wind turbine blade having an outer skin forming a blade shape on the outside of a main girder, wherein the outer skin has a sandwich structure in which a plastic foam is sandwiched between fiber reinforced plastics.