Wind turbine blade main beam structure, wind turbine blade and wind turbine generator set

Abstract

The present invention relates to the field of wind power generation, and provides a wind turbine blade main beam structure, a wind turbine blade, and a wind turbine generator set, comprising a main beam pultruded plate and a beam edge chamfer, wherein the beam edge chamfer is arranged on the side of the main beam pultruded plate. And along the thickness direction of the blade, the chord width of the main beam pultruded plate increases step by step or gradually increases. Such an arrangement increases the width of the main beam along the chord direction of the blade, so that the thickness of the main beam is reduced accordingly, thereby reducing the thickness difference between the main beam and the core material of the shell. And because the width of the main beam along the chord direction of the blade increases, the main beam pultruded plate occupies part of the filling space of the chamfer strip, thereby reducing the amount of the beam edge chamfer strip, thereby reducing the weight of the blade, realizing a lightweight blade design, reducing the production cost of the blade, and solving the problem in the prior art that the thickness difference between the main beam structure of the wind turbine blade and the shell is large, the amount of chamfer strips used is increased, and the weight of the blade is increased.

Description

Technical Field

[0001] The present invention relates to the technical field of wind power generation, and in particular to a wind turbine blade main beam structure, a wind turbine blade and a wind turbine generator set. Background Art

[0002] With the demand for sustainable environmental development, wind energy, as a clean and pollution-free renewable energy source, has been widely used. Wind power generation is very environmentally friendly and has huge wind energy reserves. Therefore, wind power generation is increasingly gaining attention.

[0003] In recent years, wind turbine blades have shown a trend of becoming larger. As wind turbine blades become longer and the loads become heavier, the thickness of the wind turbine blade main beam structure has also increased to meet the strength and stiffness requirements of the blades.

[0004] In the prior art, Figure 1 and Figure 2 As shown, due to the increased thickness of the main beam 10, the thickness difference between the main beam 10 and the shell 20 is also correspondingly larger. In order to achieve the transition connection between the main beam 10 and the shell 20, it is necessary to use chamfered strips 30 for filling, so as to connect the main beam 10 and the shell 20 and eliminate local stress.

[0005] However, due to the large difference in thickness between the main beam 10 and the shell 20 , the filling amount of the chamfer strips also increases, resulting in a larger blade weight, which is not conducive to large-scale and lightweight design of the blade and has high processing costs.

[0006] Therefore, how to solve the problem in the prior art of the large difference in thickness between the main beam structure and the shell of the wind turbine blade, increasing the use of chamfer strips and increasing the weight of the blade, has become an important technical problem to be solved by those skilled in the art. Summary of the Invention

[0007] The purpose of the present invention is to provide a wind turbine blade main beam structure, a wind turbine blade and a wind turbine generator set to solve the problem in the prior art that the thickness difference between the wind turbine blade main beam structure and the shell is large, the use of chamfer strips is increased, and the weight of the blade is increased.

[0008] In order to achieve the above-mentioned objectives, the present invention provides a wind turbine blade main beam structure, comprising a main beam pultruded plate and a beam edge chamfer, wherein the beam edge chamfer is arranged on the side of the main beam pultruded plate, and along the thickness direction of the blade, the chord width of the main beam pultruded plate increases step by step or gradually increases.

[0009] According to the wind turbine blade main beam structure provided by the present invention, along the thickness direction of the blade, the main beam pultruded plate includes m groups of pultruded plate layers stacked sequentially from the inside to the outside, each group of pultruded plate layers includes at least one layer of pultruded plate,

[0010] In the first group of pultruded plate layers, each layer is provided with n pultruded plates, and the n pultruded plates are arranged side by side along the chord length direction of the blade.

[0011] In the mth group of pultruded plate layers, each layer is provided with n+2×(m-1) pultruded plates, and the n+2×(m-1) pultruded plates are arranged side by side along the chord length direction of the blade; wherein m≥2, n≥1.

[0012] According to the wind turbine blade main beam structure provided by the present invention, in the first group of pultruded plate layers, each layer is provided with an odd number of pultruded plates.

[0013] And with the first The center lines of the pultruded plates are symmetrical axes, and the main beam pultruded plates are symmetrically distributed.

[0014] According to the wind turbine blade main beam structure provided by the present invention, in the first group of pultruded plate layers, each layer is provided with an even number of the pultruded plates.

[0015] And with the first The pultruded plate and The joints of the pultruded plates are symmetry axes, and the pultruded plates of the main beam are symmetrically distributed.

[0016] According to the wind turbine blade main beam structure provided by the present invention, the number of layers included in each group of pultruded plate layers decreases successively from the first group of pultruded plate layers to the mth group of pultruded plate layers.

[0017] According to the wind turbine blade main beam structure provided by the present invention, the pultruded board is a carbon fiber pultruded board and / or a glass fiber pultruded board.

[0018] According to the wind turbine blade main beam structure provided by the present invention, the material of the beam edge chamfer is at least one of PET, PVC and BALSA.

[0019] According to the wind turbine blade main beam structure provided by the present invention, the beam edge chamfer is made of carbon fiber pultruded board or glass fiber pultruded board.

[0020] The present invention also provides a wind turbine blade, comprising the wind turbine blade main beam structure as described in any one of the above items.

[0021] The present invention also provides a wind turbine generator set, comprising at least one wind turbine blade, wherein the wind turbine blade is configured as the wind turbine blade described above.

[0022] The wind turbine blade main beam structure provided by the present invention includes a main beam pultruded plate and a beam edge chamfer, and the beam edge chamfer is arranged at the side position of the main beam pultruded plate. And along the thickness direction of the blade, the chord width of the main beam pultruded plate increases step by step or gradually increases. Such an arrangement increases the width of the main beam along the chord direction of the blade, so that the thickness of the main beam is reduced accordingly, thereby reducing the thickness difference between the main beam and the core material of the shell. And because the width of the main beam along the chord direction of the blade increases, the main beam pultruded plate occupies part of the filling space of the chamfer strip, thereby reducing the amount of beam edge chamfer strip used, thereby reducing the weight of the blade, realizing a lightweight blade design, reducing the production cost of the blade, and solving the problem in the prior art that the thickness difference between the main beam structure of the wind turbine blade and the shell is large, increasing the amount of chamfer strip used, and increasing the weight of the blade. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 It is a schematic diagram of the structure of a wind turbine blade in the prior art;

[0025] Figure 2 It is a partial schematic diagram of the main beam structure of a wind turbine blade in the prior art;

[0026] Figure 3 This is a schematic structural diagram of a wind turbine blade provided by the present invention;

[0027] Figure 4 This is a partial schematic diagram of the wind turbine blade main beam structure provided by the present invention;

[0028] Reference numerals:

[0029] Figure 1 and Figure 2 middle:

[0030] 10: Main beam; 20: Shell; 30: Chamfer strip;

[0031] Figure 3 and Figure 4 middle:

[0032] 1: Main beam pultruded plate; 2: Beam edge chamfer; 3: Shell core material;

[0033] 101: The first group of pultruded board layers; 102: The second group of pultruded board layers; 103: The third group of pultruded board layers. DETAILED DESCRIPTION

[0034] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present invention pertains. The terms used in the specification of the present invention are intended only to describe specific embodiments and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the related listed items. In the description of the present invention, it should be noted that the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

[0036] The following combination Figures 3 and 4 The wind turbine blade main beam structure of the present invention is described.

[0037] like Figures 3 and 4 As shown, an embodiment of the present invention provides a main beam structure for a wind turbine blade, comprising a main beam pultruded plate 1 and a beam edge chamfer 2. Specifically, the main beam is the primary load-bearing structure of the wind turbine blade, providing the blade with bending and torsion resistance. The main beam pultruded plate 1 is manufactured using a pultrusion process. Pultrusion technology is a molding method for continuously producing fixed-section fiber-reinforced composite materials. It has higher fault tolerance, resource utilization, fiber content, and stronger structural performance, and is an emerging molding process for wind turbine blade main beams.

[0038] like Figure 3 As shown, the beam edge chamfers 2 are provided on the left and right sides of the main beam pultruded plate 1, which are used to connect the main beam pultruded plate 1 and the shell core material 3, and also play a role in relieving stress. Moreover, along the thickness direction of the blade, the chord width of the main beam pultruded plate 1 increases step by step or gradually increases. For example, the chord width of the main beam pultruded plate 1 can be in a step-by-step growth form, or the chord width of the main beam pultruded plate 1 can be in a continuous growth form. That is to say, in the chord length direction of the blade, that is, Figure 3 In the direction indicated by the middle arrow, the chord width of the main beam pultruded plate 1 shows a trend of growth and expansion.

[0039] It should be noted that, Figure 3 As for the placement position of the wind turbine blade main beam structure shown in the figure, the up and down direction in the figure is the blade thickness direction, and the left and right direction in the figure refers to the left and right direction, the blade chord length direction and the chord width direction of the main beam pultruded plate 1. Figure 3 The figure shows the chordal section of the blade. Figure 3The direction indicated by the solid arrow is the direction of the blade chord length.

[0040] This arrangement increases the width of the main beam along the blade chord direction, ensuring blade stability while reducing the thickness of the main beam accordingly, thereby reducing the thickness difference between the main beam and the shell core material 3. Furthermore, due to the increased width of the main beam along the blade chord direction, the main beam pultruded plate 1 occupies part of the filling space of the chamfer strips, thereby reducing the amount of chamfer strips used at the beam edge. This can further reduce the weight of the blade, achieve a lightweight blade design, and reduce blade production costs. This solves the problem in the prior art of wind turbine blades where the thickness difference between the main beam structure and the shell is large, which increases the use of chamfer strips and increases the weight of the blade.

[0041] In the embodiment of the present invention, Figure 4 As shown, along the thickness direction of the blade, the main beam pultruded plate 1 includes m groups of pultruded plate layers stacked sequentially from the inside to the outside, and each group of pultruded plate layers includes at least one layer of pultruded plate. Figure 4 As shown, from bottom to top, the first pultruded sheet layer 101, the second pultruded sheet layer 102, ..., and the mth pultruded sheet layer are stacked in sequence. Each pultruded sheet layer can have one layer, or two or more layers. The number of pultruded sheet layers to be laid depends on the design requirements of the wind turbine blade.

[0042] Specifically, if Figure 4 As shown, in the first group of pultruded sheet layers 101, each layer is provided with n pultruded sheets, arranged side by side along the blade chord length. That is, from left to right, n pultruded sheets are laid in parallel in each layer. Here, n ≥ 1, and the specific value of n can be set according to the design requirements of the blade main beam structure.

[0043] In the mth group of pultruded plate layers, each layer is provided with n+2×(m-1) pultruded plates, and n+2×(m-1) pultruded plates are arranged side by side along the chord length direction of the blade. Among them, m≥2, and the specific value of the number m can be determined according to the design requirements of the blade main beam structure. Specifically, take m equal to 3 as an example. Then, in the second group of pultruded plate layers, each layer is provided with n+2 pultruded plates. In the third group of pultruded plate layers, each layer is provided with n+4 pultruded plates. Further, if in the first group of pultruded plate layers 101, each layer is provided with 4 pultruded plates, that is, n is equal to 4. Then, in the second group of pultruded plate layers, each layer is provided with 6 pultruded plates. In the third group of pultruded plate layers, each layer is provided with 8 pultruded plates.

[0044] It should be noted that, Figure 4As for the placement position of the wind turbine blade main beam structure shown in the figure, the up and down directions in the figure refer to the up and down positions and the blade thickness direction, and the left and right directions in the figure refer to the left and right positions and the blade chord length direction; the lower side of the main beam pultruded plate 1 in the figure refers to the inner side, and the upper side of the main beam pultruded plate 1 in the figure refers to the outer side. Figure 3 The direction indicated by the hollow arrow is the thickness direction of the blade. Figure 3 The direction indicated by the solid arrow is the direction of the blade chord length.

[0045] With this arrangement, as the number of pultruded plates laid along the chord direction of the blade in each group of pultruded plate layers continues to increase, the purpose of increasing the chord width of the blade main beam is achieved, thereby reducing the thickness of the blade main beam, narrowing the thickness difference between the blade main beam and the shell core material 3, and then reducing the use of beam edge chamfer 2 material, thereby achieving the effect of reducing the weight of the blade.

[0046] Furthermore, in some embodiments of the present invention, in the first group of pultruded plate layers 101, each layer is provided with an odd number of pultruded plates. Then, correspondingly, in the remaining groups of pultruded plate layers, each layer is also provided with an odd number of pultruded plates. The main beam pultruded panels 1 are symmetrically distributed, with the centerline of each pultruded panel as the axis of symmetry. Specifically, taking n as 3 as an example, each layer of the first pultruded panel layer 101 is provided with three pultruded panels. Simultaneously, with the centerline of the second pultruded panel as the axis of symmetry, the main beam pultruded panels 1 are symmetrically distributed.

[0047] In some embodiments of the present invention, in the first group of pultruded sheet layers 101, each layer is provided with an even number of pultruded sheets. Accordingly, in the remaining groups of pultruded sheet layers, each layer is also provided with an even number of pultruded sheets. The pultruded plate and The joints of the pultruded plates are the symmetry axes, and the main beam pultruded plates 1 are symmetrically distributed. Specifically, take n equal to 4 as an example. Then, if Figure 4 As shown, in the first group of pultruded plate layers 101, each layer is provided with four pultruded plates. At the same time, with the joint between the second and third pultruded plates as the axis of symmetry, the main beam pultruded plates 1 are symmetrically distributed.

[0048] With such arrangement, the entire main beam pultruded plate 1 is arranged axially symmetrically along the chord direction of the blade, which can make the left and right sides of the blade main beam evenly stressed, which is beneficial to improving the stability of the blade and ensuring the service life of the blade.

[0049] Furthermore, in a specific embodiment of the present invention, the number of layers in each group of pultruded sheet layers decreases from the first group 101 to the mth group 102. That is, the number of layers in the first group 101 is greater than the number of layers in the second group 102, the number of layers in the second group 102 is greater than the number of layers in the third group 103, and so on.

[0050] Such an arrangement, on the one hand, can ensure that the blade main beam has sufficient strength and rigidity. On the other hand, the closer to the outer layer of the blade main beam, the fewer layers of each group of pultruded plate layers there are, and the smaller their thickness, which is conducive to the transition and connection of the blade main beam to the shell core material 3.

[0051] In optional embodiments of the present invention, the pultruded panels are carbon fiber and / or glass fiber. In other words, the pultruded main beam can be constructed from either carbon fiber or glass fiber, or a combination of carbon fiber and glass fiber can be stacked together. This arrangement, where pultruded main beams reinforced with carbon fiber or glass fiber replace vacuum-injected main beams, offers significant advantages in the process of increasing the size and weight of wind turbine blades, reducing the weight while still meeting the required strength and stiffness.

[0052] In a specific embodiment of the present invention, the material of the beam edge chamfer 2 is at least one of PET (Polyethylene Terephthalate), PVC (Polyvinyl Chloride), and BALSA (Balsa). This configuration uses the same material as the blade core material to form the beam edge chamfer 2, facilitating a better connection with the shell core material 3.

[0053] As an optional embodiment of the present invention, the beam edge chamfer 2 is made of carbon fiber pultruded board or glass fiber pultruded board. In this way, the beam edge chamfer 2 is made of the same material as the blade main beam, which not only serves to connect the blade main beam and the blade core material, but also further reduces the weight of the blade.

[0054] In summary, the embodiment of the present invention provides a main beam structure of a wind turbine blade, comprising a main beam pultruded plate 1 and a beam edge chamfer 2, wherein the beam edge chamfer 2 is arranged on the left and right sides of the main beam pultruded plate 1. Along the thickness direction of the blade, the chord width of the main beam pultruded plate 1 increases step by step or gradually increases. Specifically, Figure 4As shown, along the thickness direction of the blade, the main beam pultruded plate 1 includes m groups of pultruded plate layers stacked sequentially from the inside to the outside, and each group of pultruded plate layers includes at least one layer of pultruded plate. In the first group of pultruded plate layers 101, each layer is provided with n pultruded plates, and the n pultruded plates are arranged side by side along the chord length of the blade. In the mth group of pultruded plate layers, each layer is provided with n+2×(m-1) pultruded plates, and the n+2×(m-1) pultruded plates are arranged side by side along the chord length of the blade. Among them, m≥2, n≥1. And along the chord length direction of the blade, the main beam pultruded plate 1 is symmetrically distributed as a whole.

[0055] This design creates a novel chord-wise layup structure for the blade main beam. While ensuring the required strength and stiffness of the blade main beam, the overall thickness of the blade main beam is reduced by increasing the chord-wise width of the blade main beam, thereby minimizing the thickness difference between the main beam and the core material. Furthermore, a portion of the fillet space created by the chamfer strips is occupied by the main beam pultruded plate, reducing the amount of chamfer strips used. This, in turn, reduces the amount of blade core material used, reduces blade weight, and saves production costs.

[0056] The wind turbine blade provided by the present invention is described below. The wind turbine blade described below and the wind turbine blade main beam structure described above can be referred to each other.

[0057] The embodiment of the present invention also provides a wind turbine blade, including a wind turbine blade main beam structure as described in the above embodiments. This arrangement increases the width of the main beam along the chord direction of the blade, while ensuring the stability of the blade, the thickness of the main beam is correspondingly reduced, thereby reducing the thickness difference between the main beam and the shell core material 3. In addition, since the width of the main beam along the chord direction of the blade becomes larger, the main beam pultruded plate 1 occupies part of the filling space of the chamfer strips, thereby reducing the amount of chamfer strips on the beam edge, thereby reducing the weight of the blade, realizing a lightweight blade design, reducing the production cost of the blade, and solving the problem in the prior art that the thickness difference between the wind turbine blade main beam structure and the shell is large, increasing the amount of chamfer strips used, and increasing the weight of the blade. The derivation process of this beneficial effect is roughly similar to the derivation process of the beneficial effect of the above-mentioned wind turbine blade main beam structure, so it will not be repeated here.

[0058] The wind turbine generator set provided by the present invention is described below. The wind turbine generator set described below and the wind turbine blades described above can be referred to in correspondence with each other.

[0059] An embodiment of the present invention also provides a wind turbine generator set, comprising at least one wind turbine blade. The wind turbine blade is configured as a wind turbine blade as in the above embodiment. This configuration increases the width of the main beam along the chord direction of the blade, thereby ensuring the stability of the blade and reducing the thickness of the main beam accordingly, thereby reducing the thickness difference between the main beam and the shell core material 3. Furthermore, since the width of the main beam along the chord direction of the blade becomes larger, the main beam pultruded plate 1 occupies part of the filling space of the chamfer strips, thereby reducing the amount of chamfer strips on the beam edge, thereby reducing the weight of the blade, realizing a lightweight blade design, reducing the production cost of the blade, and solving the problem in the prior art that the thickness difference between the main beam structure of the wind turbine blade and the shell is large, increasing the amount of chamfer strips used, and increasing the weight of the blade. The derivation process of this beneficial effect is roughly similar to the derivation process of the beneficial effect of the above-mentioned wind turbine blade, so it will not be repeated here.

[0060] Furthermore, a wind turbine also includes a tower and other components. The lightweight blade design reduces the loads exerted by the blades on the tower and other components. This allows the wind turbine to achieve lightweight design goals while also reducing overall production costs.

[0061] In summary, an embodiment of the present invention provides a wind turbine generator set, which, based on the lightweight design of wind turbine blades, reduces the load on the tower and other components of the entire machine, thereby further realizing the lightweight design of the entire wind turbine generator set and reducing the production cost of the set.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A wind turbine blade main beam structure, characterized in that: It includes a main beam pultruded plate and a beam edge chamfer, wherein the beam edge chamfer is arranged on the side of the main beam pultruded plate, and the chord width of the main beam pultruded plate increases step by step or gradually along the thickness direction of the blade; Along the thickness direction of the blade, the main beam pultruded plate includes m groups of pultruded plate layers stacked sequentially from the inside to the outside, and each group of pultruded plate layers includes at least one layer of pultruded plate. In the first group of pultruded plate layers, each layer is provided with n pultruded plates, and the n pultruded plates are arranged side by side along the chord length direction of the blade. In the mth group of pultruded plate layers, each layer is provided with n+2×(m-1) pultruded plates, and the n+2×(m-1) pultruded plates are arranged side by side along the chord length of the blade; wherein m≥2, n≥1; In the first group of pultruded plate layers, each layer is provided with an odd number or an even number of pultruded plates. When there is an odd number of pultruded plates, The center line of each pultruded plate is the axis of symmetry, and the main beam pultruded plates are symmetrically distributed; When there are an even number of pultruded plates, The pultruded plate and The joints of the pultruded plates are symmetry axes, and the pultruded plates of the main beam are symmetrically distributed.

2. The wind turbine blade main beam structure according to claim 1, characterized in that: From the first group of pultruded board layers to the mth group of pultruded board layers, the number of layers included in each group of pultruded board layers decreases successively.

3. The wind turbine blade main beam structure according to claim 1, characterized in that: The pultruded board is a carbon fiber pultruded board and / or a glass fiber pultruded board.

4. The wind turbine blade main beam structure according to claim 1, characterized in that: The material of the beam edge chamfer is at least one of PET, PVC and BALSA.

5. The wind turbine blade main beam structure according to claim 1, characterized in that: The beam edge chamfer is made of carbon fiber pultruded board or glass fiber pultruded board.

6. A wind turbine blade, characterized in that: It comprises the wind turbine blade main beam structure according to any one of claims 1 to 5.

7. A wind turbine generator set, comprising at least one wind turbine blade, characterized in that: The wind turbine blade is configured as the wind turbine blade according to claim 6.

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