A blade web structure fusing a leaf vein with a honeycomb structure and a fan blade

Abstract

The application relates to the technical field of fan blades, in particular to a blade web structure integrating leaf veins and honeycomb structures and a fan blade. The blade web structure comprises a first leaf vein bionic web and a second leaf vein bionic web arranged in a cross manner. The first leaf vein bionic web and the second leaf vein bionic web comprise a plate body, a main vein arranged along the length direction of the plate body, and a plurality of side veins connected to the two sides of the main vein, and the main vein and the side veins form a leaf vein structure. A honeycomb structure is arranged on the plate body, and the two sides of the main vein are covered with a reinforcing layer. Space bearing is realized through the cross web, hierarchical force transmission is realized through the leaf vein structure, lightweight support and load dispersion are realized through the honeycomb structure, and the main force bearing path is strengthened through the reinforcing layer, so that the multidirectional bearing capacity, the anti-deformation capacity, the anti-buckling capacity and the service reliability of the web are improved.

Description

Technical Field

[0001] This application relates to the field of wind turbine blade technology, and in particular to a blade web structure and wind turbine blade that integrates leaf veins and honeycomb structure. Background Technology

[0002] Wind turbine blades are key components in wind turbine generators used to capture wind energy and convert it into mechanical energy. As wind turbine generators develop towards higher power, larger rotor diameters, and deep-sea applications, the length of wind turbine blades is constantly increasing. The bending loads, shear loads, torsional loads, and lateral loads that the blades bear during operation are also increasing. This places higher demands on the lightweight, stiffness, and stability of the internal load-bearing structure of the blades.

[0003] Inside a wind turbine blade, the web is typically positioned between the pressure and suction skins. It supports the blade shell, transmits shear loads, and works in conjunction with structures such as the blade spar cap to resist bending and torsional deformation. The structural performance of the web directly affects the blade's overall stiffness, buckling resistance, torsional resistance, and long-term service reliability.

[0004] Existing wind turbine blades mostly adopt structural forms such as straight webs, locally reinforced webs, or honeycomb webs.

[0005] The straight web is typically a plate-like structure extending along the blade's span. While simple in structure and with mature manufacturing processes, its load-bearing path is relatively singular. When large blades are subjected to complex multi-directional loads, the straight web can experience problems such as localized stress concentration, plate buckling, and lateral deformation. Simply increasing the thickness to improve stiffness would significantly increase the blade's weight.

[0006] Locally reinforced webs are webs with stiffeners to improve the local load-bearing capacity of the web. However, the stiffeners are usually arranged in a predetermined direction and mainly enhance loads in a local or single direction. They have limited overall ability to disperse torsional loads, lateral loads, and multi-directional coupled loads.

[0007] Honeycomb webs typically utilize a honeycomb sandwich structure to improve the specific stiffness and energy absorption capacity of the web. However, existing honeycomb webs struggle to effectively distribute the main spanwise bending load, localized concentrated loads, and lateral loads on wind turbine blades. When the blades are subjected to complex loads, problems such as crushing, shear instability, or discontinuous load transfer can occur in localized areas of the honeycomb cells.

[0008] Therefore, existing wind turbine blade web structures struggle to simultaneously meet requirements such as multi-directional load bearing, graded load transfer, stress homogenization, buckling resistance, and reinforcement of localized high-stress areas while maintaining weight control. Especially under harsh operating conditions, the increased deformation of large wind turbine blades makes them prone to crack initiation, propagation, or fatigue damage in localized high-stress areas of the web, impacting the long-term reliability of the blades. Summary of the Invention

[0009] In view of this, the purpose of this application is to provide a blade web structure and wind turbine blade that integrates leaf veins and honeycomb structure to solve some or all of the above-mentioned problems.

[0010] To achieve the above technical objectives, this application provides a leaf web structure that integrates leaf veins and honeycomb structure, including a first leaf vein biomimetic web and a second leaf vein biomimetic web. The first leaf vein biomimetic ventral plate and the second leaf vein biomimetic ventral plate are arranged in a crisscross pattern. The first leaf vein biomimetic ventral plate and the second leaf vein biomimetic ventral plate include: a plate body, a main vein and multiple lateral veins; The main vein is disposed on the plate body and extends along the length direction of the plate body; Multiple side veins are provided on the plate body; The lateral veins are respectively connected to both sides of the main vein and extend to both sides of the main vein, so that the main vein and the lateral veins form a leaf vein structure; The plate is provided with a honeycomb structure; The main vein is covered with reinforcing layers on both sides.

[0011] Furthermore, the honeycomb walls of the honeycomb structure form the veins in the leaf vein structure; The fine veins connect to the lateral veins or the main vein.

[0012] Furthermore, the width of the fine veins is smaller than the width of the lateral veins.

[0013] Furthermore, the honeycomb structure is a regular hexagonal honeycomb structure.

[0014] Furthermore, the honeycomb structure covers the entire plate.

[0015] Furthermore, the main vein includes a three-layer sandwich structure; The three-layer sandwich structure includes two panels and a lightweight sandwich layer disposed between the two panels; The reinforcement layer covers the outer side of both panels.

[0016] Furthermore, the lateral veins and the honeycomb structure include a three-layer sandwich structure; The three-layer sandwich structure includes two panels and a lightweight sandwich layer disposed between the two panels.

[0017] Furthermore, the reinforcing layer is a CFRP carbon fiber composite layer.

[0018] Furthermore, multiple lateral veins are disposed on one side of the plate near the leaf root along its length.

[0019] A second aspect of this application provides a wind turbine blade, including a blade shell and a blade web structure that integrates veins and a honeycomb structure as described in any of the above claims. The blade web structure is disposed within the blade shell.

[0020] As can be seen from the above technical solutions, this application provides a blade web structure and a wind turbine blade that integrates leaf veins and a honeycomb structure; wherein, the blade web structure integrating leaf veins and a honeycomb structure includes a first leaf vein bionic web and a second leaf vein bionic web; the first leaf vein bionic web and the second leaf vein bionic web are arranged intersectingly; the first leaf vein bionic web and the second leaf vein bionic web include: a plate body, a main vein and multiple lateral veins; the main vein is disposed on the plate body and extends along the length direction of the plate body; multiple lateral veins are disposed on the plate body; the multiple lateral veins are respectively connected to both sides of the main vein and extend to both sides of the main vein, so that the main vein and the multiple lateral veins form a leaf vein structure; a honeycomb structure is provided on the plate body; and a reinforcing layer is covered on both sides of the main vein.

[0021] In this design, by incorporating intersecting first and second leaf vein biomimetic webs, the blade web structure is transformed from a single-planar load-bearing structure to a spatially intersecting load-bearing structure. This allows it to simultaneously resist bending loads, shear loads, lateral loads, and torsional loads during blade operation, improving the multi-directional load-bearing capacity, overall stiffness, and structural stability of the blade web structure. Furthermore, by incorporating a main vein extending along the length of the plate and multiple lateral veins on either side of it, forming a leaf vein structure, the load is initially borne by the main vein and then distributed to both sides of the plate via the lateral veins. This creates a graded force transmission path, reducing local stress concentration and minimizing the risk of local deformation, crack initiation, and fatigue damage under complex loads. Finally, by incorporating a honeycomb structure on the plate, lightweight support and load distribution are achieved, increasing the specific stiffness, buckling resistance, and energy absorption capacity of the web structure without significantly increasing weight, thus balancing the lightweight nature and mechanical performance of the blade web. In addition, by covering both sides of the main vein with a reinforcing layer, the main vein, which is the main load-bearing path, can be locally strengthened, thereby improving the strength, stiffness, deformation resistance and fatigue resistance of the main vein, and avoiding material redundancy caused by strengthening the entire plate. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application 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 of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 A schematic diagram of a blade web structure that integrates leaf veins and a honeycomb structure is provided in an embodiment of this application; Figure 2 A schematic diagram of a wind turbine blade provided in an embodiment of this application; Figure 3 A partial schematic diagram of a blade web structure integrating leaf veins and honeycomb structure provided in an embodiment of this application; Figure 4 This is a schematic diagram of the main vein layered structure of a leaf web structure that integrates leaf veins and honeycomb structure, provided in an embodiment of this application. In the figure: 1. First leaf vein biomimetic ventral plate; 2. Second leaf vein biomimetic ventral plate; 3. Plate body; 4. Main vein; 41. Reinforcing layer; 5. Lateral vein; 6. Honeycomb structure; 61. Fine vein; 7. Leaf shell; 81. Panel; 82. Lightweight sandwich layer. Detailed Implementation

[0024] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments in this application specification, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection claimed in this application.

[0025] In the description of the embodiments of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application 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 the embodiments of this application. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0026] In the description of the embodiments of this application, 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 a fixed connection, a replaceable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0027] Please see Figures 1 to 4 The embodiment of this application provides a blade web structure that integrates leaf veins and honeycomb structure, which can be set inside the blade shell 7 of the wind turbine blade to support the pressure surface skin and suction surface skin of the blade shell 7, and cooperate with the blade beam cap and other structures to transmit shear loads and resist bending deformation and torsional deformation.

[0028] In this embodiment, the blade web structure includes a first vein bionic web 1 and a second vein bionic web 2. The first vein bionic web 1 and the second vein bionic web 2 are arranged intersectingly. In one embodiment, the first vein bionic web 1 and the second vein bionic web 2 are arranged perpendicularly to each other to form a spatial three-dimensional support system. Specifically, the first vein bionic web 1 can be arranged along the plane containing the spreading direction of the blade shell 7 and the thickness direction of the blade shell 7, and is used to bear the main loads such as conventional bending loads and in-plane shear loads during blade operation; the second vein bionic web 2 is perpendicular to the first vein bionic web 1 and is used to resist lateral loads, torsional loads, and multi-directional coupled loads perpendicular to the main force direction. Through the above-mentioned intersecting arrangement, the load-bearing capacity of the blade web structure against non-main force direction loads can be improved, as well as the overall torsional resistance, lateral stiffness, and structural stability of the wind turbine blade can be improved.

[0029] In this embodiment, the first leaf vein biomimetic web 1 and the second leaf vein biomimetic web 2 include a plate body 3, a main vein 4, and multiple lateral veins 5. In a preferred embodiment, both the first leaf vein biomimetic web 1 and the second leaf vein biomimetic web 2 include a plate body 3, a main vein 4, and multiple lateral veins 5, so that both sets of webs have the following biomimetic leaf vein force transmission structure.

[0030] In this embodiment, the plate 3 can be a long strip-shaped web body adapted to the internal space of the wind turbine blade. The main vein 4 is disposed on the plate 3 and extends along the length direction of the plate 3. The length direction of the plate 3 can be understood as the length direction of the blade shell 7. As a primary core load-bearing component, the main vein 4 is used to directly bear and transmit the main axial force, bending moment and shear force in the blade spanwise direction, reducing the risk of overall instability and large deformation of the web.

[0031] Multiple side veins 5 are disposed on the plate 3. The multiple side veins 5 are respectively connected to both sides of the main vein 4 and extend to both sides of the main vein 4, so that the main vein 4 and the multiple side veins 5 form a blade vein structure. The side veins 5 serve as secondary flow-distributing load-bearing components, used to disperse the concentrated load borne by the main vein 4 to the lateral area of ​​the plate 3. This allows the main vein 4 to bear the load first when the wind turbine blades are subjected to complex loads such as bending, torsion, and lateral impact, and then the load is distributed to the lateral areas of the plate 3 through the side veins 5, thereby reducing local stress concentration.

[0032] It should be noted that in the embodiments provided in this application, the first vein biomimetic web 1 and the second vein biomimetic web 2 are arranged in a crisscross pattern, meaning that the first vein biomimetic web 1 is arranged along the xz plane, and the second vein biomimetic web 2 is arranged along the yz plane. The first vein biomimetic web 1 and the second vein biomimetic web 2 are perpendicular and orthogonal to each other, forming a spatial three-dimensional load-bearing structure. Here, the z-direction corresponds to the spanwise direction of the blade, and the x and y directions correspond to two mutually perpendicular directions within the blade cross-section, respectively. The first vein biomimetic web 1 is used to bear the conventional bending load and in-plane shear load during blade operation, while the second vein biomimetic web 2 is used to bear lateral loads and torsional loads in directions different from those in the plane containing the first vein biomimetic web 1. The two sets of vein biomimetic webs together serve as the primary load-bearing body, enabling the blade web structure to transform from single-plane load-bearing to multi-directional spatial load-bearing.

[0033] In some embodiments, multiple side veins 5 are disposed on one side of the plate 3 along its length, near the blade root. Since the area near the blade root of the wind turbine blade usually bears a large bending moment and shear load, concentrating the side veins 5 on one side near the blade root is beneficial for graded reinforcement of high-load areas; at the same time, other areas along the length of the plate 3 can be mainly supported by the honeycomb structure 6 to achieve lightweight support, avoiding the increase in web weight caused by too many side veins arranged along the entire length.

[0034] A honeycomb structure 6 is provided on the plate 3. The honeycomb structure 6 can cover the entire plate 3, that is, the honeycomb structure 6 is distributed on the plate 3 along the length and width directions. By covering the plate 3 with the honeycomb structure 6, the plate 3 can obtain continuous lightweight support and energy absorption capacity. Furthermore, the honeycomb structure 6 can serve as an internal support and force transmission and energy absorption structure for the plate 3, enabling the plate 3 to achieve high specific stiffness and buckling resistance without significantly increasing the amount of material used.

[0035] In some embodiments, the honeycomb structure 6 can be a regular hexagonal honeycomb structure. Specifically, the honeycomb structure 6 includes multiple regular hexagonal honeycomb cells arranged regularly, with adjacent cells sharing a honeycomb wall. Regular hexagonal honeycomb cells are characterized by their regular arrangement, balanced stress distribution, high porosity, and high material utilization. Under load, the honeycomb structure 6 can continuously dissipate external load energy through the progressive extrusion deformation of the honeycomb wall, thereby extending the energy absorption time and increasing the overall energy absorption capacity.

[0036] In this design, multiple cell units of the honeycomb structure 6 overlap and constrain each other, forming a self-locking integral load-bearing system. The honeycomb structure 6 not only acts as veins 61 to distribute loads but also provides in-plane support for the area between the main vein 4 and the side veins 5. When the main vein 4 or the side vein 5 is subjected to load and exhibits lateral displacement or local deformation, the honeycomb structure 6, through the mutual constraint between its cell walls, provides bidirectional constraint support to the walls of the plate 3 and the cavity area between the main vein 4 and the side veins 5, thereby limiting lateral displacement of the skeleton, local collapse of the plate surface, and local buckling deformation.

[0037] In some embodiments, the honeycomb wall of the honeycomb structure 6 forms the veins 61 in the leaf vein structure, and the veins 61 connect to the lateral veins 5 or the main vein 4. That is to say, the honeycomb structure 6 does not exist only as a normal sandwich filling material, but as the final distributed load-bearing structure of the leaf vein structure, which together with the main vein 4 and the lateral veins 5 constitutes a continuous biomimetic leaf vein force transmission network.

[0038] In the above embodiments, the structural arrangement of the main vein 4, lateral veins 5, and fine veins 61 forms a hierarchical force transmission structure inspired by plant leaves. During long-term exposure to external loads such as wind, rain, and snow, plant leaves form a mesh-like support system where the main vein, lateral veins, and fine veins work together. The main vein bears the primary load, the lateral veins transfer the load borne by the main vein to the lateral areas of the leaf, and the fine veins further distribute the load to multiple areas within the leaf plane. Based on this hierarchical force transmission characteristic, this application sets the main vein 4, lateral veins 5, and fine veins 61 formed by honeycomb walls on the plate 3, so that the leaf web structure forms a biomimetic leaf vein skeleton composed of primary load bearing, secondary flow distribution, and tertiary dispersion.

[0039] Furthermore, the main vein 4, lateral veins 5, and honeycomb structure 6 together form a hollowed-out leaf vein web structure. This structure only incorporates structural material along the load-bearing paths, such as the main vein 4, lateral veins 5, and honeycomb walls, rather than using a solid, integral filling method. The honeycomb holes in the honeycomb structure 6 serve as weight-reduction spaces, reducing the amount of material accumulated in the web structure.

[0040] Through the above configuration, the blade web structure no longer relies solely on a single flat plate surface for load bearing. Instead, it forms an orderly force transmission path through the main vein 4, lateral veins 5, and fine veins 61. This allows the load to be transmitted and diffused step-by-step along the biomimetic leaf vein skeleton when the blade is subjected to wind loads, bending loads, torsional loads, or lateral loads, thereby improving the overall stiffness, load dispersion capability, and deformation resistance of the web structure. Furthermore, the hollowed-out leaf vein web structure reduces redundant material while ensuring the continuity of the load transmission path. This allows the web structure to achieve higher structural stiffness and energy absorption capacity with a limited increase in weight, avoiding the problems of large self-weight, increased overall load, and decreased dynamic stability caused by the overall material stacking of traditional solid webs.

[0041] In one implementation, the width of the fine vein 61 is smaller than the width of the side vein 5. By gradually decreasing the width of the structure, a three-level force transmission path of main vein 4, side vein 5, and fine vein 61 can be formed, so that more material is distributed in the main force-bearing path and less in the final dispersion area, thereby achieving both structural strength and lightweight.

[0042] During load transfer, the main vein 4 initially bears the primary load along the blade span, forming the first-level load-bearing path. The side veins 5 divert the concentrated stress in the main vein 4 to the lateral region of the plate 3, forming the second-level load-bearing path. The fine veins 61 formed by the honeycomb walls further disperse the load to each honeycomb unit of the honeycomb structure 6, forming the third-level distributed load-bearing region. This allows for the gradual diversion, uniform diffusion, and eventual dissipation of the load, reducing the risk of localized stress accumulation, crack initiation, and fatigue damage.

[0043] The main vein 4 is covered on both sides with reinforcing layers 41. Reinforcing layers 41 can be CFRP (carbon fiber reinforced polymer) composite layers. As a primary force transmission path, the main vein 4 withstands high-amplitude bending, shear, and torsional loads over long periods, supporting critical load-bearing areas in the web structure prone to deformation, buckling, or fatigue damage. By covering the main vein 4 with reinforcing layers 41, the strength, modulus, buckling resistance, and fatigue resistance of the main vein 4 can be improved, thereby enhancing the load-bearing stability of the high-stress areas of the entire blade web structure.

[0044] In one implementation, the main vein 4 may include a three-layer sandwich structure. The three-layer sandwich structure includes two panels 81 and a lightweight core layer 82 disposed between the two panels 81. A reinforcing layer 41 covers the outer sides of the two panels 81.

[0045] Specifically, the reinforcing layer 41 is laminated onto the outer side of the two panels 81 of the main vein 4 in a stacked ply manner, without replacing or filling the lightweight sandwich layer 82. The lightweight sandwich layer 82 remains the original lightweight sandwich material, used for weight reduction and providing basic support; the reinforcing layer 41, as a reinforcing ply attached to the outer side of the panels 81, is used to improve the strength, modulus, buckling resistance, and fatigue resistance of the main vein 4. Through the above, this embodiment can enhance the load-bearing capacity of the main vein 4 without significantly increasing the overall weight of the web and the complexity of the process.

[0046] In some embodiments, the side veins 5 and the honeycomb structure 6 may also include a three-layer sandwich structure. This three-layer sandwich structure also includes two panels 81 and a lightweight core layer 82 disposed between the two panels 81. The three-layer sandwich structure of the side veins 5 and the honeycomb structure 6 helps maintain the overall lightweight effect of the web and the basic stiffness. Compared to the main vein 4, the side veins 5 and the honeycomb structure 6 mainly undertake the functions of diversion, support, and energy absorption; therefore, a traditional sandwich structure can be used to reduce material redundancy and manufacturing costs.

[0047] In this embodiment, the overall web structure, side veins 5, and honeycomb structure 6 can all adopt a traditional sandwich structure as a base, while the main vein 4 is locally reinforced with a CFRP carbon fiber composite layer 41 on the basis of the sandwich structure. This partitioned material selection method allows the high-stress main load-bearing area to obtain higher strength reserves, while the low-stress distributed support area remains lightweight, thereby improving the problem of insufficient strength in high-stress areas and material redundancy in low-stress areas caused by the use of the same material and uniform layup method throughout the traditional web.

[0048] In practical applications, when wind turbine blades are subjected to extreme wind speeds, icing, or gust impacts, the blades will experience significant bending, torsional, and lateral deformations. With the blade web structure proposed in this application, the main vein 4 can preferentially bear the main bending moment and axial load, the side veins 5 can divert concentrated loads to both sides of the plate 3, and the fine veins 61 and honeycomb structure 6 can further diffuse the load to multiple honeycomb units of the plate 3.

[0049] like Figures 1 to 4 As shown, this application also provides a wind turbine blade, which includes a blade shell 7 and a blade web structure that integrates the aforementioned vein and honeycomb structure. The blade web structure is disposed within the blade shell 7. Specifically, the blade web structure can be disposed between the pressure surface skin and the suction surface skin of the blade shell 7 to support the blade shell 7, transmit shear loads, and improve the overall bending and torsional resistance of the blade.

[0050] In implementation, the outer contour of the plate 3 can be determined first based on the internal space and load distribution of the wind turbine blade, so that the plate 3 has the same shape as the blade spanwise. Then, a honeycomb structure 6 is formed covering the plate 3. Subsequently, a main vein 4 extending along the length direction is set on the plate 3, and multiple side veins 5 are set on both sides of the main vein 4 according to the local high load areas of the blade. The honeycomb walls of the honeycomb structure 6 are connected to the main vein 4 and / or the side veins 5, and fine veins 61 are formed by the honeycomb walls. Before laying the main vein 4, the reinforcement layer 41 has been laid on both sides. Finally, the first blade vein biomimetic web 1 and the second blade vein biomimetic web 2 are arranged crosswise and installed inside the blade shell 7, thereby forming an internal load-bearing structure of the wind turbine blade with spatial three-dimensional support capabilities.

[0051] Through the above-described embodiments, this application has at least the following beneficial effects: First, the first vein bionic web 1 and the second vein bionic web 2 are arranged in a cross pattern to form a three-dimensional spatial support system, which enables the wind turbine blades to resist not only bending and shear loads in the main force direction, but also lateral loads, torsional loads and multi-directional coupled loads, thereby improving the overall stiffness and stability of large wind turbine blades.

[0052] Second, the main vein 4, the lateral veins 5, and the fine veins 61 formed by the honeycomb wall together constitute a biomimetic leaf vein force transmission network, which can realize the gradual distribution of load from the main vein 4 to the lateral veins 5 and then to the fine veins 61, so that the concentrated stress is gradually diffused to the entire plate 3, reducing local stress concentration and reducing the risk of crack initiation, propagation and fatigue damage.

[0053] Third, the honeycomb structure 6 is distributed throughout the plate 3, and preferably adopts a regular hexagonal honeycomb structure. The self-locking support, stress balance and high porosity characteristics of the regular hexagonal honeycomb can be used to improve the specific stiffness, buckling resistance and progressive energy absorption capacity of the web, while reducing the use of redundant materials and maintaining the lightweight of the blade web.

[0054] Fourth, the reinforcement layer 41 only reinforces the key first-level load-bearing paths such as the main vein 4. The side veins 5 and the honeycomb structure 6 can still adopt a three-layer sandwich structure, thereby realizing the partitioning of materials according to the stress level, which not only improves the load-bearing capacity of high stress areas, but also avoids material redundancy in low stress areas.

[0055] Fifth, when the reinforcing layer 41 is made of CFRP carbon fiber composite layer, the high strength, high modulus, buckling resistance and fatigue resistance of CFRP can be utilized to improve the structural stiffness and fatigue resistance of the main vein 4. At the same time, since the CFRP reinforcing layer 41 is composited on the outside of the panel 81 and does not replace the lightweight sandwich layer 82, the weight reduction and basic support effect of the sandwich structure can be maintained.

[0056] Sixth, the entire structure combines leaf vein graded force transmission, honeycomb lightweight support and local CFRP reinforcement in the same blade web structure, which can improve the multi-directional load-bearing capacity, deformation resistance, buckling resistance and long-term service reliability of the wind turbine blade web without significantly increasing the blade weight and manufacturing complexity.

[0057] The above are merely preferred embodiments of this application and are not intended to limit the present invention. Although this application has been described in detail with reference to the embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. However, any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A leaf web structure integrating leaf veins and honeycomb structure, characterized in that, Including the first vein biomimetic ventral plate (1) and the second vein biomimetic ventral plate (2); The first leaf vein biomimetic ventral plate (1) and the second leaf vein biomimetic ventral plate (2) are arranged in a crisscross pattern; The first leaf vein biomimetic ventral plate (1) and the second leaf vein biomimetic ventral plate (2) include: plate body (3), main vein (4) and multiple lateral veins (5); The main vein (4) is disposed on the plate (3) and extends along the length direction of the plate (3); Multiple side veins (5) are provided on the plate (3); Multiple lateral veins (5) are respectively connected to both sides of the main vein (4) and extend to both sides of the main vein (4) so ​​that the main vein (4) and multiple lateral veins (5) form a leaf vein structure; The plate (3) is provided with a honeycomb structure (6); The main vein (4) is covered with a reinforcing layer (41) on both sides.

2. The leaf web structure integrating leaf veins and honeycomb structure according to claim 1, characterized in that, The honeycomb wall of the honeycomb structure (6) forms the veins (61) in the leaf vein structure. The fine vein (61) connects to the lateral vein (5) or the main vein (4).

3. The leaf web structure integrating leaf veins and honeycomb structure according to claim 2, characterized in that, The width of the fine vein (61) is smaller than the width of the lateral vein (5).

4. The leaf web structure integrating leaf veins and honeycomb structure according to any one of claims 1 to 3, characterized in that, The honeycomb structure (6) is a regular hexagonal honeycomb structure.

5. The leaf web structure integrating leaf veins and honeycomb structure according to any one of claims 1 to 3, characterized in that, The honeycomb structure (6) covers the plate (3).

6. The leaf web structure integrating leaf veins and honeycomb structure according to claim 1, characterized in that, The main vein (4) includes a three-layer sandwich structure; The three-layer sandwich structure includes two panels (81) and a lightweight sandwich layer (82) disposed between the two panels. The reinforcing layer (41) covers the outside of the two panels (81).

7. The leaf web structure integrating leaf veins and honeycomb structure according to claim 1 or 6, characterized in that, The lateral vein (5) and the honeycomb structure (6) include a three-layer sandwich structure; The three-layer sandwich structure includes two panels (81) and a lightweight sandwich layer (82) disposed between the two panels.

8. The leaf web structure integrating leaf veins and honeycomb structure according to claim 1 or 6, characterized in that, The reinforcing layer (41) is a CFRP carbon fiber composite layer.

9. The leaf web structure integrating leaf veins and honeycomb structure according to claim 1, characterized in that, Multiple lateral veins (5) are disposed on one side of the plate (3) along the length direction near the leaf root.

10. A wind turbine blade, characterized in that, Includes the blade shell (7) and the blade web structure that integrates leaf veins and honeycomb structure as described in any one of claims 1 to 8; The blade web structure is disposed within the blade shell (7).

Images