Modular blade web and spar connection, method of connection and blade

Abstract

The application relates to the technical field of wind power blades, in particular to a modular blade web and main beam connecting structure, a connecting method and a blade, which comprises a web, glass fiber reinforced plastic, a wrapping layer, a first reinforcing layer, a second reinforcing layer and a positioning piece; one end of the web close to the main beam is provided with the glass fiber reinforced plastic; the wrapping layer is arranged on the outer layer of the web and the glass fiber reinforced plastic; the two sides of the wrapping layer are provided with the first reinforcing layer and the second reinforcing layer; the wrapping layer, the glass fiber reinforced plastic and the first reinforcing layer are provided with first through holes; the second reinforcing layer is provided with second through holes; the positioning piece is arranged in the first through holes and the second through holes; structural glue is arranged between the second reinforcing layer and the wrapping layer; the bottom of the wrapping layer, the first reinforcing layer and the second reinforcing layer is flush, and the wrapping layer is flush with the surface of the main beam, so that the height difference between the web and the reinforcing layer is eliminated, and steps are avoided; when the bottom surface of the web is connected with the main beam, holes and gaps are avoided between the bottom of the web and the main beam, and the quality and the safety factor of the blade are improved.

Description

Technical Field

[0001] This invention relates to the field of wind turbine blade technology, and in particular to a modular blade web and main beam connection structure, connection method and blade. Background Technology

[0002] As a component in wind turbine generators that captures wind energy, the blade plays an extremely important role. With the development of the wind energy industry, the size of the blades has gradually increased. As the size of the blades increases, their weight also increases, which puts forward higher requirements for wind turbine generators. At the same time, large tooling is needed to manufacture the blades, which requires a lot of space. Therefore, how to achieve lightweight and modular design of large-size wind turbine blades has become its development direction.

[0003] In the existing modular blade web-to-main beam connection structure, due to manufacturing factors, there is a height difference between the web and the reinforcing layer. This results in holes and gaps between the web and the main beam when they are connected, which has a significant impact on the blade's safety factor.

[0004] The information disclosed in this background section is intended only to enhance the understanding of the general background of the invention and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0005] This invention provides a modular blade web and main beam connection structure, connection method, and blade, thereby effectively solving the problems in the background art.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is: a modular blade web and main beam connection structure, comprising:

[0007] Web, fiberglass, cladding layer, first reinforcing layer, second reinforcing layer, and positioning components;

[0008] The web is arranged perpendicular to the main beam, and the end of the web near the main beam is provided with fiberglass.

[0009] The wrapping layer is provided on the outer layer of the web and the fiberglass; a first reinforcing layer and a second reinforcing layer are provided on both sides of the wrapping layer;

[0010] The wrapping layer, the fiberglass, and the first reinforcing layer are provided with a first through hole along the direction parallel to the main beam;

[0011] The second reinforcing layer is provided with a second through hole; positioning elements are provided in the first through hole and the second through hole; structural adhesive is provided between the second reinforcing layer and the wrapping layer;

[0012] Make the bottom of the wrapping layer, the first reinforcing layer and the second reinforcing layer flush with each other and flat against the surface of the main beam.

[0013] Furthermore, the first reinforcing layer is integrally cast with the web and the wrapping layer, and the second reinforcing layer is manually bonded by the structural adhesive.

[0014] Furthermore, the web and the wrapping layer are integrally cast, and the first reinforcing layer and the second reinforcing layer on both sides are manually set by the structural adhesive.

[0015] Furthermore, the wrapping layer has an L-shaped structure, including a first extending edge and a second extending edge. The first extending edge wraps around the perimeter of the web, and the second extending edge is arranged parallel to the surface of the main beam.

[0016] Furthermore, the second extension edge extends away from the side of the second reinforcing layer.

[0017] Furthermore, the second extension edge extends toward the side closer to the second reinforcing layer.

[0018] Furthermore, the length or width of the first reinforcing layer gradually decreases on the side closest to the fiberglass.

[0019] Furthermore, the length and width of the first reinforcing layer gradually decrease on the side closest to the fiberglass.

[0020] The present invention also includes a connection method using the above-described modular blade web and main beam connection structure, comprising the following steps:

[0021] The web, fiberglass and the bottom of the first reinforcing layer are flush and integrally cast. After the fabrication is completed, the first through hole is machined along the direction parallel to the main beam.

[0022] The second reinforcing layer is machined with a second through hole at the corresponding position;

[0023] The web is bonded to the second reinforcing layer, structural adhesive is applied between the second reinforcing layer and the web, and the positioning element is installed in the first through hole and the second through hole for positioning.

[0024] The aforementioned modular blade web is connected to the main beam.

[0025] The present invention also includes a blade comprising the modular blade web and main beam connection structure described above and a shell, wherein the modular blade web and main beam connection structure is disposed inside the shell.

[0026] The beneficial effects of this invention are as follows: This invention comprises a web, fiberglass, a cladding layer, a first reinforcing layer, a second reinforcing layer, and positioning elements; the web is positioned perpendicular to the main beam, with fiberglass at one end of the web near the main beam; the cladding layer is located on the outer layer of the web and fiberglass; a first reinforcing layer and a second reinforcing layer are provided on both sides of the cladding layer; a first through hole is provided along the direction parallel to the main beam in the cladding layer, fiberglass, and the first reinforcing layer; a second through hole is provided in the second reinforcing layer; positioning elements are provided in the first and second through holes; structural adhesive is provided between the second reinforcing layer and the cladding layer; the bottoms of the cladding layer, the first reinforcing layer, and the second reinforcing layer are flush with each other and flat against the surface of the main beam, eliminating the height difference between the web and the reinforcing layers, avoiding steps, and preventing holes and gaps between the bottom of the web and the main beam when the web bottom is connected, thus improving the quality and safety factor of the blade. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the connection structure between the modular blade web and the main beam in Example 1;

[0029] Figure 2 In order to be in Figure 1 A magnified view of a section at point A in the middle;

[0030] Figure 3 This is a schematic diagram of the structure of the wrapping layer in Example 1;

[0031] Figure 4 This is a schematic diagram of the structure in Example 1 where the length of the reinforcing layer gradually decreases.

[0032] Figure 5 This is a schematic diagram of the structure in Example 2 where the width of the reinforcing layer gradually decreases.

[0033] Figure 6 This is a schematic diagram of the structure in Example 3 where the length and width of the reinforcing layer gradually decrease.

[0034] Figure 7 This is a schematic diagram of the encapsulation layer structure in Example 4;

[0035] Figure 8 This is a schematic diagram of the connection structure between the modular blade web and the main beam in Example 5;

[0036] Figure 9 This is a schematic diagram of the blade structure in this invention;

[0037] Figure 10 This is a flowchart of the method for connecting the modular blade web to the main beam in this invention.

[0038] Reference numerals: 1. Main beam; 2. Web plate; 3. Fiberglass; 31. First through hole; 4. Wrapping layer; 41. First extension edge; 42. Second extension edge; 5. First reinforcing layer; 6. Second reinforcing layer; 61. Second through hole; 7. Positioning element; 8. Structural adhesive; 9. Shell. Detailed Implementation

[0039] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0040] In the description of this invention, it should be noted that the orientations or positional relationships indicated by terms such as "center", "up", "down", "left", "right", "vertical", "horizontal", "inner", and "outer" are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0041] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0042] Example 1:

[0043] like Figures 1 to 4 As shown: A modular blade web and main beam connection structure, comprising:

[0044] 2. Web plate; 3. Fiberglass; 4. Wrapping layer; 5. First reinforcing layer; 6. Second reinforcing layer; and 7. Positioning element;

[0045] The web 2 is set perpendicular to the main beam 1, and a fiberglass 3 is provided at one end of the web 2 near the main beam 1.

[0046] The outer layer 4 is provided on the web 2 and the fiberglass 3; the outer layer 4 is provided with a first reinforcing layer 5 and a second reinforcing layer 6 on both sides;

[0047] The cladding layer 4, fiberglass 3, and first reinforcing layer 5 are provided with a first through hole 31 along the direction parallel to the main beam 1;

[0048] The second reinforcing layer 6 is provided with a second through hole 61; a positioning element 7 is provided in the first through hole 31 and the second through hole 61; and structural adhesive 8 is provided between the second reinforcing layer 6 and the wrapping layer 4.

[0049] Make the bottom of the wrapping layer 4, the first reinforcing layer 5, and the second reinforcing layer 6 flush with each other and flat against the main beam 1.

[0050] By setting up a web 2, fiberglass 3, cladding layer 4, first reinforcing layer 5, second reinforcing layer 6, and positioning element 7; the web 2 is set perpendicular to the main beam 1, and fiberglass 3 is provided at one end of the web 2 near the main beam 1; the cladding layer 4 is provided on the outer layer of the web 2 and fiberglass 3; the first reinforcing layer 5 and the second reinforcing layer 6 are provided on both sides of the cladding layer 4; the cladding layer 4, fiberglass 3, and the first reinforcing layer 5 are provided with a first through hole 31 along the direction parallel to the main beam 1; the second reinforcing layer 6 is provided with a second through hole 61; positioning element 7 is provided in the first through hole 31 and the second through hole 61, and structural adhesive 8 is provided between the second reinforcing layer 6 and the cladding layer 4; the bottom of the cladding layer 4, the first reinforcing layer 5, and the second reinforcing layer 6 are flush with each other and flat with the surface of the main beam 1, eliminating the height difference between the web 2 and the first reinforcing layer 5 and the second reinforcing layer 6, avoiding the formation of steps, and avoiding holes and gaps between the bottom of the web 2 and the main beam 1 when the bottom surface of the web 2 is connected to the main beam 1, thus improving the quality and safety factor of the blade.

[0051] In this embodiment, the positioning element 7 is a fiberglass pin, but it can also be other forms, such as a bolt, which is inserted into the first through hole 31 and the second through hole 61 for positioning.

[0052] The aforementioned fiberglass 3 is a composite structure formed by pultrusion of untwisted glass fiber bundles and epoxy resin, or it is a composite structure formed by pultrusion of uniaxial glass fiber fabric and resin.

[0053] The fiberglass 3 is convenient for machining the first through hole 31, and it can also prevent shrinkage deformation during vacuuming, which would cause a step between the blade and the plane of the reinforcing layer, thus ensuring the flatness of the bottom surface, eliminating the gap between the web 2 and the main beam 1, and further improving the safety factor of the blade.

[0054] The two sides of the wrapping layer 4 are provided with a first reinforcing layer 5 and a second reinforcing layer 6, which have a straightening and reinforcing effect and increase the stability of the connection between the web 2 and the main beam 1.

[0055] The web 2 and fiberglass 3 have a straight structure. The straight web 2 is simple to manufacture, easy to form, and reduces processing costs.

[0056] As a preferred embodiment of the above, the first reinforcing layer 5 is integrally cast with the web 2 and the wrapping layer 4, and the second reinforcing layer 6 is manually bonded by structural adhesive 8.

[0057] like Figure 2 As shown, the first reinforcing layer 5, web 2, and cladding layer 4 are integrally formed by vacuum injection molding. After becoming a whole, a first through hole 31 is machined at one end near the main beam 1. The first through hole 31 passes through the cladding layer 4, fiberglass 3, and the first reinforcing layer 5. The first through hole 31 is integrally formed by vacuum injection molding and then machined in one go, which ensures the uniformity and accuracy of the position of the first through hole 31 on the cladding layer 4, fiberglass 3, and the first reinforcing layer 5, thereby ensuring the flatness of the bottom of the cladding layer 4 and the bottom of the first reinforcing layer 5. The second through hole 61 on the second reinforcing layer 6 is machined according to the hole positioning dimensions in the drawing. Structural adhesive 8 is applied to the bonding area of ​​the second reinforcing layer 6, and it is positioned and bonded to the web 2 by glass pins, thereby ensuring that the bottom of the second reinforcing layer 6 and the bottom of the web 2 are flat.

[0058] In this embodiment, the wrapping layer 4 has an L-shaped structure, including a first extending edge 41 and a second extending edge 42. The first extending edge 41 wraps around the web plate 2, and the second extending edge 42 is arranged parallel to the surface of the main beam 1.

[0059] like Figure 3 As shown, by setting the wrapping layer 4 into an L-shaped structure, the first extension edge 41 is perpendicular to the second extension edge 42. The first extension edge 41 wraps around the web plate 2, and the second extension edge 42 is set parallel to the surface of the main beam 1. The second extension edge 42 increases the contact area between the bottom plate of the web plate 2 and the main beam 1, making the bonding stronger.

[0060] The second extension edge 42 extends away from the second reinforcing layer 6.

[0061] The second extension edge 42 is attached to the main beam 1 on one side and to the first reinforcing layer 5 on the other side, which facilitates the vacuum-assisted injection molding of the wrapping layer 4 and the first reinforcing layer 5, making them more compact.

[0062] like Figure 4 As shown, in a preferred embodiment, the length of the first reinforcing layer 5 gradually decreases on the side closest to the fiberglass 3.

[0063] As the length of the first reinforcing layer 5 gradually decreases on the side closest to the fiberglass 3, the outward supporting effect of the connection end between the web 2 and the main beam 1 gradually weakens. Therefore, by setting this gradually narrowing structural form, the connection strength between the first reinforcing layer 5 and the main beam 1 can be guaranteed, while reducing material waste and improving product utilization.

[0064] Example 2:

[0065] like Figure 5As shown, unlike Embodiment 1, the width of the first reinforcing layer 5 gradually decreases on the side closest to the fiberglass 3. This can ensure the structural strength of the connection between the first reinforcing layer 5 and the main beam 1, while also reducing material waste and improving product utilization.

[0066] Example 3:

[0067] like Figure 6 As shown, unlike in Embodiment 1, the length and width of the first reinforcing layer 5 gradually decrease on the side closest to the fiberglass 3.

[0068] By setting the length and width of the first reinforcing layer 5 to gradually decrease on the side closest to the fiberglass 3, the same goal can be achieved: ensuring the structural strength of the connection between the first reinforcing layer 5 and the main beam 1, while reducing material waste and improving product utilization.

[0069] Example 4:

[0070] like Figure 7 As shown, unlike in Embodiment 1, the second extension edge 42 extends toward the side closer to the second reinforcing layer 6.

[0071] By extending the second extension edge 42 towards the side closer to the second reinforcing layer 6, with one side of the second extension edge 42 attached to the main beam 1 and the other side attached to the second reinforcing layer 6, the same effect of a flat bottom can be achieved, but the effect in embodiment 1 is better.

[0072] Example 5:

[0073] like Figure 8 As shown, unlike Example 1, the web 2 and the wrapping layer 4 are integrally cast, and the first reinforcing layer 5 and the second reinforcing layer 6 on both sides are manually set by structural adhesive 8.

[0074] By setting the web 2 and the wrapping layer 4 as an integral injection molding, the first through hole 31 is processed after completion. The second through hole 61 is processed on the first reinforcing layer 5 and the second reinforcing layer 6 according to the drawings. Then, structural adhesive 8 is applied to the bonding area of ​​the first reinforcing layer 5 and the second reinforcing layer 6 on both sides. The web 2 is then positioned and bonded with glass pins, thereby ensuring that the bottom of the second reinforcing layer 6 is flat with the bottom of the web 2. The process of Example 2 is more complicated than that of Example 1, but it also achieves the effect of flatness of the first reinforcing layer 5, the second reinforcing layer 6 and the bottom plate of the web 2.

[0075] like Figure 10 As shown, this embodiment also includes a connection method, using the modular blade web 2 and the main beam 1 connection structure as described above, including the following steps:

[0076] The bottom of the web plate 2, fiberglass 3 and the first reinforcing layer 5 are flush and integrally cast. After the fabrication is completed, the first through hole 31 is machined along the direction parallel to the main beam 1.

[0077] The second reinforcing layer 6 is machined with a second through hole 61 at the corresponding position;

[0078] The web 2 is bonded to the second reinforcing layer 6. Structural adhesive 8 is applied between the second reinforcing layer 6 and the web 2. The positioning element 7 is installed in the first through hole 31 and the second through hole 61 for positioning.

[0079] The modular blade web 2 is connected to the main beam 1.

[0080] like Figure 9 As shown, this embodiment also includes a blade, including the modular blade web 2 and main beam 1 connection structure as described above and a shell 9. The modular blade web 2 and main beam 1 connection structure is located inside the shell 9.

[0081] By setting up a web 2, fiberglass 3, cladding layer 4, first reinforcing layer 5, second reinforcing layer 6, and positioning element 7; the web 2 is set perpendicular to the main beam 1, and fiberglass 3 is provided at one end of the web 2 near the main beam 1; the cladding layer 4 is provided on the outer layer of the web 2 and fiberglass 3; the first reinforcing layer 5 and the second reinforcing layer 6 are provided on both sides of the cladding layer 4; the cladding layer 4, fiberglass 3, and the first reinforcing layer 5 are provided with a first through hole 31 along the direction parallel to the main beam 1; the second reinforcing layer 6 is provided with a second through hole 61; positioning element 7 is provided in the first through hole 31 and the second through hole 61, and structural adhesive 8 is provided between the second reinforcing layer 6 and the cladding layer 4; the bottom of the cladding layer 4, the first reinforcing layer 5, and the second reinforcing layer 6 are flush with each other and flat with the surface of the main beam 1, eliminating the height difference between the web 2 and the first reinforcing layer 5 and the second reinforcing layer 6, avoiding the formation of steps, and avoiding holes and gaps between the bottom of the web 2 and the main beam 1 when the bottom surface of the web 2 is connected to the main beam 1, thus improving the quality and safety factor of the blade.

[0082] Those skilled in the art should understand that this invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to this invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A modular blade web connection structure to a main beam, characterized in that, include: Web, fiberglass, cladding layer, first reinforcing layer, second reinforcing layer, and positioning components; The web is arranged perpendicular to the main beam, and the end of the web near the main beam is provided with fiberglass. The wrapping layer is provided on the outer layer of the web and the fiberglass; a first reinforcing layer and a second reinforcing layer are provided on both sides of the wrapping layer; The wrapping layer, the fiberglass, and the first reinforcing layer are provided with a first through hole along the direction parallel to the main beam; The second reinforcing layer is provided with a second through hole; positioning elements are provided in the first through hole and the second through hole, and structural adhesive is provided between the second reinforcing layer and the wrapping layer; Make the bottom of the wrapping layer, the first reinforcing layer and the second reinforcing layer flush with each other and flat against the surface of the main beam; The first reinforcing layer is integrally cast with the web and the wrapping layer, and the second reinforcing layer is manually bonded by the structural adhesive. The wrapping layer has an L-shaped structure, including a first extension edge and a second extension edge. The first extension edge wraps around the perimeter of the web, and the second extension edge is arranged parallel to the surface of the main beam.

2. The modular blade web and main beam connection structure according to claim 1, characterized in that, The second extension edge extends away from the side of the second reinforcing layer.

3. The modular blade web and main beam connection structure according to claim 1, characterized in that, The second extension edge extends toward the side closer to the second reinforcing layer.

4. The modular blade web and main beam connection structure according to claim 1, characterized in that, The length or width of the first reinforcing layer gradually decreases on the side closest to the fiberglass.

5. The modular blade web and main beam connection structure according to claim 1, characterized in that, The length and width of the first reinforcing layer gradually decrease on the side closest to the fiberglass.

6. A connection method, characterized in that, The modular blade web and main beam connection structure as described in claims 1 to 5 includes the following steps: The web, fiberglass and the bottom of the first reinforcing layer are flush and integrally cast. After the fabrication is completed, the first through hole is machined along the direction parallel to the main beam. The second reinforcing layer is machined with a second through hole at the corresponding position; The web is bonded to the second reinforcing layer, structural adhesive is applied between the second reinforcing layer and the web, and the positioning element is installed in the first through hole and the second through hole for positioning. The aforementioned modular blade web is connected to the main beam.

7. A blade, characterized in that, It includes the modular blade web and main beam connection structure and shell as described in claims 1 to 5, wherein the modular blade web and main beam connection structure is disposed inside the shell.

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