CN207673484U - A spar cap structure for offshore wind turbine blades - Google Patents

Abstract

The utility model discloses a beam cap structure that offshore wind power generation machine blade was used, the beam cap is the trapezium structure, and this beam cap will be greater than the regional width of apex at the regional width of blade root, can provide higher rigidity in the blade root region like this, and it is less to warp at main bearing area, is favorable to improving the blade headroom, and the rigidity that the apex region needs is little, and the design width is little at the apex, is favorable to reducing apex weight, the first-order quality square that can less blade to the fatigue load that can less blade bore. In addition, the included angle of the stop position of the spar cap and the blade root reinforcing layer in the length direction is an obtuse angle, compared with a right angle in the traditional design, the stress concentration of the intersection position of other glass fiber reinforced plastic layers of the blade structure and the spar cap can be improved, the rigidity is improved without increasing the layers, and the stress is reduced by reducing the strain of the improved position.

Description

A spar cap structure for offshore wind turbine blades

technical field

The utility model relates to the technical field of wind power generator blades, in particular to a beam cap structure for offshore wind power generator blades.

Background technique

With the current development of the offshore wind power market, large-scale offshore wind turbines have become a trend, and the blades of wind turbines are also becoming larger. The length of blades in the industry is more than 70 meters, more than 80 meters, and more than 90 meters. According to records, the use of carbon fiber materials as the structural design of the key components of the blade is the choice of many design engineers, but because carbon fiber materials are relatively expensive, the current high-modulus glass fiber design is still the mainstream of wind turbine blade structural design, while glass fiber materials Under the background of offshore wind turbine generators needing to resist strong typhoons, it is difficult to meet the structural strength and clearance requirements of the current blades according to the traditional equal-width main beam structure. At the same time, the main beam structure from the blade root to the blade tip is designed After the same width, the first-order mass moment of the blade will be larger, which will increase the fatigue performance of key load-bearing components such as the main shaft of the wind turbine. In addition, the traditional wind turbine blade structure design, in addition to designing the main beam to be of equal width, can only be adjusted to meet the structural strength and stiffness requirements of the blade through the thickness of the layup. If only the thickness of the layup is adjusted, it will lead to local Stress concentration and infusion process problems.

Contents of the invention

The purpose of the utility model is to overcome the deficiencies of the prior art, and propose a new type of spar cap structure for offshore wind generator blades, which can meet the structural strength and stiffness requirements of wind generator blades at different positions in the length direction.

In order to achieve the above purpose, the technical solution provided by the utility model is: a spar cap structure for the blade of an offshore wind power generator, the spar cap is a trapezoidal structure, and the width of the spar cap at the blade root area is larger than that of the blade. At the same time, the angle between the spar cap and the cut-off position of the blade root reinforcement layer in the length direction is an obtuse angle.

Compared with the prior art, the utility model has the following advantages and beneficial effects:

1. The designed width of the spar cap structure in the blade root area is larger than that of the blade tip area, which can provide higher stiffness in the blade root area and less deformation in the main load-bearing area, which is conducive to improving the blade clearance. The required rigidity of the area is small. Since the trapezoidal structure beam cap can be designed with a small width at the blade tip, it is beneficial to reduce the weight of the blade tip, and can reduce the first-order mass moment of the blade, thereby reducing the fatigue load borne by the blade.

2. The angle between the beam cap structure and the cut-off position of the blade root reinforcement layer in the length direction is designed to be an obtuse angle. Compared with the traditionally designed right angle, it can improve the stress concentration at the intersection position of other FRP layers of the blade structure and the beam cap without passing through Increase the layup to increase the stiffness, and reduce the positional strain to reduce the stress.

3. The blade of the wind power generator adopting the spar cap structure can reduce the material consumption and the theoretical cost of the blade design structure.

Description of drawings

Fig. 1 is a structural schematic diagram of a wind turbine blade adopting the spar cap structure.

Figure 2 is a side view of the beam cap structure.

Figure 3 is a schematic diagram of the size of the beam cap structure.

FIG. 4 is a cross-sectional view along line A-A of FIG. 3 .

Fig. 5 is a B-B sectional view of Fig. 3 .

Figure 6 is an assembly diagram of the spar cap structure and the blade root reinforcement layer.

Detailed ways

Below in conjunction with specific embodiment the utility model is further described.

Referring to Figures 1 to 5, the spar cap structure for the offshore wind generator blade provided by this embodiment is specifically a trapezoidal structure, that is, the shape of the windward side spar cap 1 and the leeward side spar cap 2 of the wind power generator blade. The spar cap 1 on the windward side and the spar cap 2 on the leeward side have a trapezoidal shape, where the width of the blade root is a mm, the width of the blade tip is b mm, and the width a > b. The width of the spar cap 1 on the windward side and the spar cap 2 on the leeward side is 1400mm, and the distance between the trailing edge web 3 and the leading edge web 4 is 894mm. The beam cap 2 has a width of 830mm, and the distance between the trailing web 3 and the leading web 4 is 605mm; The remaining structures of the windward shell and the leeward shell of the blade are formed by vacuum infusion together; the trailing web 3 and the leading web 4 are also prefabricated in advance, and the structural glue is used to position the dimensions according to the intervals of the cross-sectional diagrams A-A and B-B. The shell on the windward side of the blade and the shell on the leeward side are bonded together to form a trapezoidal I-beam structure to withstand the load in the direction of blade swinging. The shell on the windward side and the shell on the leeward side are bonded together as a whole, and the spar cap 1 on the windward side, the spar cap 2 on the leeward side and the trailing edge beam 7 bear the load in the shimmy direction of the blade to meet the overall structural strength and stiffness requirements of the blade.

As shown in Figure 6, it is the assembly diagram of the spar cap and the blade root reinforcement layer. The cut-off position angle between the windward side spar cap 1, the leeward side spar cap 2 and the blade root reinforcement layer 8 in the length direction is 90.3 degrees, which is greater than 90 degrees. Compared with the right angle, it is beneficial to improve the stress concentration at the position where the beam cap intersects with other plies.

The implementation examples described above are only preferred embodiments of the present utility model, and are not intended to limit the scope of implementation of the present utility model, so all changes made according to the shape and principle of the present utility model should be covered by the scope of the present utility model. within the scope of protection.

Claims (1)

1. a kind of spar cap structure of marine wind driven generator blade, it is characterised in that：The spar cap is trapezium structure, and the beam Breadth of the cap in root of blade region is greater than the breadth of tip region, while the spar cap and blade root enhancement layer are in length direction Rest position angle is obtuse angle.