Flow guide net unit, flow guide net connecting structure and laying method of flow guide net unit

Abstract

The invention discloses a flow guide net unit, a flow guide net connecting structure and a laying method of the flow guide net unit, the flow guide net unit comprises a porous film layer, a bonding layer and a flow guide net layer, the porous film layer comprises a first surface and a second surface which are oppositely arranged in the first direction, and the porous film layer is provided with at least one connecting end; the bonding layer is arranged on the first surface of the porous membrane layer, and at least part of the bonding layer is located at the connecting end; the flow guide net layer is arranged on the first surface of the porous film layer, the flow guide net layer comprises a first part and a second part which are distributed in the second direction, the projection of the second part in the first direction is overlapped with the projection of the connecting end in the first direction, and the second part covers at least part of the bonding layer in a peelable mode; wherein the first direction is perpendicular to the second direction. The blade forming quality can be improved.

Description

Technical Field

[0001] This application belongs to the field of wind power, and in particular relates to a guide net unit, a guide net connection structure, and a method for laying the guide net unit. Background Technology

[0002] In the layup process of wind turbine blade blanks, multi-layer composite materials are typically used to construct the main structure of the product, including structural layers (such as fiberglass and core material) and auxiliary guiding materials (such as flow guide nets, injection channels, and vacuum bags). Among these, the flow guide net, as a key component of the auxiliary material system, plays a crucial role in the pressure-holding injection stage. Its pre-designed three-dimensional mesh structure forms unobstructed resin flow channels, improving the penetration efficiency and uniform distribution of epoxy resin between fiber layers. However, if the flow guide net exhibits discontinuous overlaps or loose connections during installation, it will lead to localized resin flow obstruction, resulting in defects such as poor injection and adhesion between the flow guide net and the composite material, ultimately affecting the blade molding quality. Summary of the Invention

[0003] The purpose of this application is to provide a guide net unit, a guide net connection structure, and a method for laying the guide net unit, which can improve the blade forming quality.

[0004] The first aspect of this application provides a flow guiding mesh unit, which includes a porous membrane layer, an adhesive layer, and a flow guiding mesh layer. The porous membrane layer includes a first surface and a second surface disposed opposite to each other along a first direction, and the porous membrane layer has at least one connecting end. The adhesive layer is disposed on the first surface of the porous membrane layer, and at least a portion of the adhesive layer is located at the connecting end. The flow guiding mesh layer is disposed on the first surface of the porous membrane layer, and the flow guiding mesh layer includes a first portion and a second portion distributed along a second direction. The projection of the second portion along the first direction overlaps with the projection of the connecting end along the first direction, and the second portion is peelably covered on at least a portion of the adhesive layer. The first direction and the second direction are perpendicular to each other.

[0005] In some embodiments, the material of the first part is the same as that of the second part, and the flow guide layer is an integrally formed structure.

[0006] In some embodiments, the flow guide layer has a tear line extending along a third direction, the tear line being located between a first portion and a second portion; at the location of the tear line, the first portion and the second portion are partially connected; wherein, the third direction is perpendicular to both the first direction and the second direction.

[0007] In some embodiments, the width of the second portion along the second direction is greater than or equal to 10 mm and less than or equal to 30 mm.

[0008] In some embodiments, the projection of the adhesive layer along the first direction lies within the projection of the second portion along the first direction.

[0009] In some embodiments, the adhesive layer includes a plurality of adhesive portions spaced apart along a third direction; wherein the third direction is perpendicular to the first direction and the second direction, respectively.

[0010] In some embodiments, the adhesive layer is a mesh tape.

[0011] In some embodiments, the projection of the first portion along the first direction lies within the projection of the porous mold layer along the first direction.

[0012] In some embodiments, the first part includes two first flow guiding sides disposed opposite to each other along a third direction, the first flow guiding sides being connected to the second part; wherein, the third direction is perpendicular to the first direction and the second direction respectively; the porous membrane layer also includes two first porous sides disposed opposite to each other along a third direction, the distance between the first porous sides and the first flow guiding sides along the third direction being greater than or equal to 10 mm.

[0013] In some embodiments, the first part includes a second flow-guiding side, which is disposed opposite to the second part along a second direction; the porous mold layer also includes a second porous side, which is disposed opposite to the connecting end along a second direction, and the distance between the second porous side and the second flow-guiding side along the second direction is greater than or equal to 10 mm.

[0014] Secondly, embodiments of this application also provide a flow guide net connection structure, which includes a plurality of flow guide net units according to any of the above embodiments. In two adjacent flow guide net units, one flow guide net unit is a first flow guide net unit, and the other flow guide net unit is a second flow guide net unit. The second part of the first flow guide net unit is peeled off. The second flow guide net unit includes an adhesive end, which is disposed opposite to the connection end along a second direction. The adhesive end of the second flow guide net unit is bonded to the adhesive layer of the first flow guide net unit.

[0015] In some embodiments, the adhesive end of the second flow guide net unit includes a first edge facing a first portion of the first flow guide net unit; the first portion of the first flow guide net unit includes a second edge facing the adhesive end of the second flow guide net unit; the first edge and the second edge are in contact with each other.

[0016] In some embodiments, the width of the overlap between the projection of the adhesive end of the second flow guide net unit along the first direction and the projection of the connecting end of the first flow guide net unit along the first direction is greater than or equal to 10 mm and less than or equal to 30 mm.

[0017] Thirdly, embodiments of this application also provide a method for laying a flow guiding net unit, using at least two flow guiding net units according to any of the above embodiments, the laying method including the following steps: Provide the first flow guide net unit; Remove the second portion of the first flow guide unit to expose at least a portion of the adhesive layer; Provide a second flow guide net unit; The adhesive end of the second flow guide net unit is bonded to the adhesive layer of the first flow guide net unit; wherein the adhesive end and the connecting end of the second flow guide net unit are arranged opposite to each other along the second direction.

[0018] This application provides a flow guiding mesh unit, a flow guiding mesh connection structure, and a method for laying the flow guiding mesh unit. An adhesive layer is provided on the first surface of a porous membrane layer, with at least a portion of the adhesive layer located at the connection end of the porous membrane layer. The flow guiding mesh layer includes a first portion and a second portion distributed along a second direction. The projection of the second portion along the first direction overlaps with the projection of the connection end along the first direction, and the second portion is peelably covered on at least a portion of the adhesive layer. During laying, the second portion of the first flow guiding mesh unit is first removed to expose at least a portion of the adhesive layer. Then, the adhesive end of the second flow guiding mesh unit is bonded to the adhesive layer of the first flow guiding mesh unit, forming a continuous and stable connection area. This prevents the edges of the flow guiding mesh unit from easily shifting or lifting during resin infusion, thereby avoiding localized resin flow obstruction in the connection area, reducing the risk of adhesion between the flow guiding mesh layer and the blade skin glass fiber, ensuring the yield of infusion, and improving the quality of blade molding. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application 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.

[0020] Figure 1 An exploded view of a flow guide net unit provided in some embodiments of this application; Figure 2 This is a schematic diagram of the structure of the flow guiding mesh layer provided in some embodiments of this application; Figure 3 This is a schematic diagram of the adhesive layer structure provided in some embodiments of this application; Figure 4 This is an exploded view of the flow guide net connection structure provided in some embodiments of this application; Figure 5 This is a schematic diagram of the flow guide net connection structure provided in some embodiments of this application; Figure 6 This is a flowchart illustrating the method for laying the guide net unit provided in some embodiments of this application.

[0021] Explanation of reference numerals in the attached figures: 100, Flow guiding net unit; 110, First flow guiding net unit; 111, Second edge; 120, Second flow guiding net unit; 121, Adhesive end; 122, First edge; 10, Porous membrane layer; 11, First surface; 12, Second surface; 13, Connecting end; 14, First porous side; 15, Second porous side; 20, Adhesive layer; 21, Adhesive part; 30, Flow guiding net layer; 31, First part; 311, First flow guiding side; 312, Second flow guiding side; 32, Second part; 33, Tear line; 200, Flow guiding net connection structure; X, First direction; Y, Second direction; Z, Third direction. Detailed Implementation

[0022] The embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to illustrate the principles of this application by way of example, but should not be used to limit the scope of this application, that is, this application is not limited to the described embodiments.

[0023] In the description of this application, it should be noted that, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicating orientation or positional relationships, are only for the convenience of describing 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, and therefore should not be construed as a limitation on this application. Furthermore, the terms "first," "second," and "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. "Vertical" is not vertical in the strict sense, but within the allowable tolerance range. "Parallel" is not parallel in the strict sense, but within the allowable tolerance range.

[0024] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0025] The directional terms used in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of this application. It should also be noted in the description of this application that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0026] like Figure 1 As shown, the first aspect of this application provides a flow guiding mesh unit 100, which includes a porous membrane layer 10, an adhesive layer 20, and a flow guiding mesh layer 30. The porous membrane layer 10 includes a first surface 11 and a second surface 12 disposed opposite to each other along a first direction X, and the porous membrane layer 10 has at least one connecting end 13. The adhesive layer 20 is disposed on the first surface 11 of the porous membrane layer 10, and at least a portion of the adhesive layer 20 is located at the connecting end 13. The flow guiding mesh layer 30 is disposed on the first surface 11 of the porous membrane layer 10, and the flow guiding mesh layer 30 includes a first portion 31 and a second portion 32 distributed along a second direction Y. The projection of the second portion 32 along the first direction X overlaps with the projection of the connecting end 13 along the first direction X, and the second portion 32 is peelably covered on at least a portion of the adhesive layer 20. The first direction X and the second direction Y are perpendicular to each other.

[0027] The porous membrane layer 10 is in the form of a thin film. The first direction X can be the thickness direction of the porous membrane layer 10, the first surface 11 can be the upper surface of the porous membrane layer 10, and the second surface 12 is the lower surface. The first surface 11 is used to bond with the flow guide layer 30, and the second surface 12 faces and adheres to the fiberglass skin and other layers on the blade mold during laying. The porous membrane layer 10 itself has controllable porosity, and its main function is to regulate the resin flow rate during the vacuum infusion process, preventing the resin from penetrating too quickly or too slowly. The first surface 11 of the porous membrane layer 10 can be bonded to the flow guide layer 30 by adhesive bonding to form a composite flow guide unit 100. The porous membrane layer 10 can be removed after infusion.

[0028] The adhesive layer 20 is located on the first surface 11 of the porous membrane layer 10. It can be entirely located in the region of the connecting end 13 of the porous membrane layer 10, or it can be only partially located in the region of the connecting end 13. The function of the adhesive layer 20 is to provide reliable adhesive force for bonding with the porous membrane layer 10 of adjacent flow guiding net units 100 during laying, thereby achieving mechanical fixation between the flow guiding net units 100, replacing the traditional method of relying solely on physical overlap without active connection. The adhesive layer 20 can be in the form of continuous strips, discontinuous dots, or a grid. The adhesive layer 20 may include mesh tape, double-sided tape, or other adhesives.

[0029] The flow guiding mesh layer 30 refers to the mesh material layer used in the vacuum infusion molding process of wind turbine blades. Its main function is to guide the resin to flow uniformly in the glass fiber reinforced material, ensuring sufficient wetting and curing of the blade skin and internal structure (such as main beams and auxiliary beams). The flow guiding mesh layer 30 has high permeability and flexibility to adapt to the laying requirements of the blade's curved surface. Structurally, the flow guiding mesh layer 30 is divided into two parts distributed along the second direction Y: a first part 31 and a second part 32. The first part 31 is the main working area of ​​the flow guiding mesh layer 30, responsible for guiding the resin in most areas after laying. The second part 32 is a specially designed auxiliary part. Its key features are: First, from a spatial perspective, its projection along the first direction X (thickness direction) overlaps with the projection of the connecting end 13 of the porous membrane layer 10 along the first direction X. This means that the second part 32 covers the area of ​​the connecting end 13 in the thickness direction. Second, from a functional perspective, the second part 32 is peelably covered on at least part of the adhesive layer 20. During factory storage and transportation of the flow guide unit 100, the second part 32 acts as a protective cover, protecting the adhesive layer 20 from contamination or premature adhesion of foreign matter. When connection and installation are required, the operator can peel off the second part 32 from the first part 31 along the second direction Y, thereby exposing the clean and adhesive surface of the underlying adhesive layer 20.

[0030] The first part 31 and the second part 32 can be integrally molded from the same material. By creating grooves between them, the connection strength can be weakened, making it easier to peel off the second part 32. Alternatively, the material of the second part 32 can be different from that of the first part 31; the second part 32 can be release paper or a protective film made of other materials. The first part 31 and the second part 32 can also be unconnected.

[0031] During installation, the first flow guide unit 100 is taken and laid entirely on the mold, with the adhesive layer 20 at its connecting end 13 protected by its second part 32. When connecting the second unit, the operator first removes the second part 32 at the connecting end 13 of the first flow guide unit 100, exposing its adhesive layer 20. Then, the end of the second flow guide unit 100 opposite to the connecting end 13 is bonded to the adhesive layer 20 of the corresponding connecting end 13 area of ​​the first unit. In this way, the two flow guide units 100 achieve an active and stable mechanical connection through the interface of the adhesive layer 20 and the porous membrane layer 10. At the same time, the porous membrane layers 10 of the two flow guide units 100 overlap in the connection area, forming a continuous and uninterrupted isolation layer, which enhances the connection reliability, ensures the continuity of the resin flow channel, and effectively prevents the defect of adhesion between the flow guide layer 30 and the glass fiber through the continuous porous membrane layer 10. If the number of guide net units 100 is greater than 2, then the connection of the third, fourth, ... Nth guide net units 100 is sequentially deduced. It is understandable that the second part 32 of the last guide net unit 100 can be retained without being peeled off.

[0032] In summary, this application provides a flow guiding net unit 100, a flow guiding net connection structure 200, and a method for laying the flow guiding net unit 100. An adhesive layer 20 is disposed on the first surface 11 of the porous membrane layer 10, at least a portion of which is located at the connection end 13 of the porous membrane layer 10. The flow guiding net layer 30 includes a first portion 31 and a second portion 32 distributed along a second direction Y. The projection of the second portion 32 along the first direction X overlaps with the projection of the connection end 13 along the first direction X, and the second portion 32 is peelably covered on at least a portion of the adhesive layer 20. During installation, the second part 32 of the first guide net unit 110 is first removed to expose at least a portion of the adhesive layer 20. Then, the adhesive end 121 of the second guide net unit 120 is bonded to the adhesive layer 20 of the first guide net unit 110 to form a continuous and stable connection area. This prevents the edge of the guide net unit 100 from easily shifting or lifting during resin injection, thereby avoiding local flow obstruction of resin in the connection area, reducing the risk of adhesion between the guide net layer 30 and the blade skin glass fiber, ensuring the injection yield, and improving the blade forming quality.

[0033] In some embodiments, the material of the first part 31 is the same as that of the second part 32, and the flow guide layer 30 is an integrally formed structure.

[0034] The first part 31 and the second part 32 are made of the same material. This means that both the first part 31, which serves as the main flow channel, and the second part 32, which serves as a temporary protective structure, have consistent physical and chemical properties, such as the same fiber material, mesh density, porosity, flexibility, and resin permeability. This material uniformity eliminates the risks of interfacial compatibility problems and differences in thermal expansion coefficients that may arise from the combination of different materials.

[0035] The entire flow guide layer 30 is a continuous structure formed in one piece using the same manufacturing process, rather than being assembled from two independent parts through subsequent splicing, stitching, or gluing. During the one-piece molding process, a relatively weak connection zone with lower structural strength can be artificially formed in the area by specific process control (e.g., local weakening treatment at the interface between the second part 32 and the first part 31, such as by reducing the weaving density or removing some material). This weak connection zone ensures that the flow guide layer 30 is a whole, facilitating production, winding, and transportation, while also providing a basis for the controlled peeling of the second part 32. The material of the first part 31 is the same as that of the second part 32, and the one-piece molding structure of the flow guide layer 30 also simplifies the production process and reduces costs.

[0036] In some embodiments, the flow guide layer 30 has a tear line 33 extending along a third direction Z, the tear line 33 being located between a first portion 31 and a second portion 32; at the location of the tear line 33, the first portion 31 and the second portion 32 are partially connected; wherein, the third direction Z is perpendicular to the first direction X and the second direction Y respectively.

[0037] The tear line 33 is a virtual line extending linearly along the third direction Z on the flow guide mesh layer 30. The first direction X is the thickness direction of the flow guide mesh unit 100, the second direction Y is the length direction of the flow guide mesh unit 100, and the third direction Z is the width direction of the flow guide mesh unit 100. The tear line 33 is located at the junction between the first part 31 and the second part 32 of the flow guide mesh layer 30. The connection between the first part 31 and the second part 32 is neither completely integrated nor completely separated, but rather in a partially connected state. This state can be achieved through various processes, such as specific treatment at the location of the tear line 33, such as reducing the fiber interlacing density, reducing the fiber diameter, or using a more easily broken fiber material, or forming a continuous or discontinuous, easily torn weak line through mechanical puncture, laser etching, or chemical treatment. If the two parts are manufactured separately and then laminated, an adhesive with significantly lower bonding strength than in other areas is used in this region.

[0038] When the operator needs to connect the guide net unit 100, they grasp the free end of the second part 32 and apply a pulling force along the third direction Z. Since the tear line 33 is a weak structure, the tearing behavior will be guided and limited to the predetermined tear line 33 path. This design ensures that the second part 32 can be neatly, smoothly and completely peeled off from the first part 31 without problems such as the tear line shifting into the interior of the first part 31 or causing incomplete tearing of the second part 32.

[0039] like Figure 2 As shown, in some embodiments, the width L1 of the second portion 32 along the second direction Y is greater than or equal to 10 mm and less than or equal to 30 mm.

[0040] The width L1 of the second part 32 along the second direction Y can be any value between 10mm and 30mm. For example, the width L1 of the second part 32 along the second direction Y can be 10mm, 12mm, 15mm, 17mm, 20mm, 22mm, 25mm, 27mm or 30mm.

[0041] After the second part 32 is peeled off, one end of the second flow guiding net unit 100 will replace the second part 32 of the first flow guiding net unit 100, covering the connection end 13 of the porous membrane layer 10 of the first flow guiding net unit 100. Therefore, the width L1 of the second part 32 along the second direction Y is greater than or equal to 10 mm, which can provide sufficient connection width for two adjacent flow guiding net units 100, thereby improving the connection strength between the flow guiding net units 100. Since the second part 32 needs to be peeled off, limiting the width L1 of the second part 32 along the second direction Y to less than or equal to 30 mm can avoid material waste.

[0042] In some embodiments, the projection of the adhesive layer 20 along the first direction X lies within the projection of the second portion 32 along the first direction X.

[0043] That is, the second part 32 completely covers the adhesive layer 20. After the second part 32 is removed, all the adhesive layers 20 are exposed to connect with the adjacent flow guide net unit 100, ensuring the bonding area and thus improving the connection strength between adjacent flow guide net units 100.

[0044] like Figure 3 As shown, in some embodiments, the adhesive layer 20 includes a plurality of adhesive portions 21 spaced apart along a third direction Z; wherein the third direction Z is perpendicular to the first direction X and the second direction Y, respectively.

[0045] Multiple adhesive portions 21 are spaced apart along the third direction Z, and the adhesive layer 20 is in a discontinuous state, which can not only ensure the connection strength between adjacent flow guide net units 100, but also save the material of the adhesive layer 20 and reduce costs.

[0046] In some embodiments, the adhesive layer 20 is a mesh tape.

[0047] Mesh tape has a mesh-like texture on its surface, which results in greater adhesive strength compared to tape with a smooth, flat surface.

[0048] In some embodiments, the projection of the first portion 31 along the first direction X is located within the projection of the porous mold layer 10 along the first direction X.

[0049] In other words, the porous membrane layer 10 covers the first portion 31 of the flow guiding mesh layer 30, and the edges of the first portion 31 do not extend beyond the corresponding edges of the porous membrane layer 10. This ensures that at any position in the first portion 31, the flow guiding mesh layer 30 is separated from the skin fiberglass material by the porous membrane layer 10. Regardless of how the resin flows or how the vacuum pressure changes, the flow guiding mesh layer 30 is unlikely to come into direct contact with the skin fiberglass material, thereby reducing the risk of the flow guiding mesh layer 30 sticking to the skin fiberglass material and avoiding affecting the vacuum injection molding quality of the blade.

[0050] like Figure 1 As shown, in some embodiments, the first part 31 includes two first flow guiding sides 311 disposed opposite to each other along the third direction Z, and the first flow guiding sides 311 are connected to the second part 32; wherein, the third direction Z is perpendicular to the first direction X and the second direction Y respectively; the porous membrane layer 10 also includes two first porous sides 14 disposed opposite to each other along the third direction Z, and the distance L2 between the first porous sides 14 and the first flow guiding sides 311 along the third direction Z is greater than or equal to 10 mm.

[0051] The first guiding side 311 refers to the edges of the first portion 31 of the guiding mesh layer 30 on both sides in the third direction Z, and these two sides are connected to the second portion 32. The first porous side 14 refers to the edges of the porous membrane layer 10 on both sides in the third direction Z.

[0052] The first porous side 14 of the porous membrane layer 10 extends beyond the first flow guiding side 311 of the flow guiding mesh layer 30. The distance L2 between the first porous side 14 and the first flow guiding side 311 along the third direction Z refers to the vertical distance between the first porous side 14 and the first flow guiding side 311 along the third direction Z, that is, the distance by which the first porous side 14 extends beyond the corresponding first flow guiding side 311 along the third direction Z.

[0053] The distance L2 between the first porous side 14 and the first flow guiding side 311 along the third direction Z can be 10mm, 12mm, 15mm, 17mm, 20mm, 22mm, 25mm, 27mm or 30mm.

[0054] By providing a porous membrane layer 10 of sufficient width on both sides of the third direction Z, the porous membrane layer 10 completely covers the first part 31 of the flow guiding mesh layer 30 in the third direction Z, reducing the risk of direct contact and bonding between the flow guiding mesh layer 30 and the blade skin fiberglass material along the third direction Z, and further improving the blade forming quality.

[0055] In some embodiments, the first portion 31 includes a second flow guiding side 312, which is disposed opposite to the second portion 32 along the second direction Y; the porous mold layer also includes a second porous side 15, which is disposed opposite to the connecting end 13 along the second direction Y, and the distance L3 between the second porous side 15 and the second flow guiding side 312 along the second direction Y is greater than or equal to 10 mm.

[0056] The second flow guiding side 312 refers to an edge of the first portion 31 of the flow guiding mesh layer 30, which is located at the other end opposite to the second portion 32 along the second direction Y. The second porous side 15 refers to the other edge of the porous membrane layer 10 in the second direction Y, opposite to the connecting end 13.

[0057] The second porous side 15 of the porous membrane layer 10 extends beyond the second flow guiding side 312 of the flow guiding mesh layer 30. The distance L2 between the second porous side 15 and the second flow guiding side 312 along the second direction Y refers to the vertical distance between the second porous side 15 and the second flow guiding side 312 along the second direction Y, that is, the distance by which the second porous side 15 extends beyond the corresponding second flow guiding side 312 along the second direction Y.

[0058] The distance L3 between the second porous side 15 and the second flow guiding side 312 along the second direction Y can be 10mm, 12mm, 15mm, 17mm, 20mm, 22mm, 25mm, 27mm or 30mm.

[0059] By also providing a porous membrane layer 10 of sufficient width at the end in the second direction Y, the porous membrane layer 10 completely covers the first part 31 of the flow guiding mesh layer 30 in the second direction Y, reducing the risk of direct contact and bonding between the flow guiding mesh layer 30 and the blade skin fiberglass material in the second direction Y, and further improving the blade forming quality.

[0060] Please refer to the following: Figure 4 and Figure 5Secondly, this application embodiment also provides a flow guide net connection structure 200, which includes a plurality of flow guide net units 100 according to any of the above embodiments. In two adjacent flow guide net units 100, one flow guide net unit 100 is a first flow guide net unit 110, and the other flow guide net unit 100 is a second flow guide net unit 120. The second part 32 of the first flow guide net unit 110 is peeled off. The second flow guide net unit 120 includes an adhesive end 121, which is disposed opposite to the connecting end 13 along the second direction Y. The adhesive end 121 of the second flow guide net unit 120 is bonded to the adhesive layer 20 of the first flow guide net unit 110.

[0061] The adhesive end 121 of the second flow guiding net unit 120 is located above the connection end 13 of the porous membrane layer 10 of the first flow guiding net unit 110 and covers at least part of the adhesive layer 20. The adhesive end 121 of the second flow guiding net unit 120 may not have an adhesive layer 20 and may be directly bonded to the adhesive layer 20 of the first flow guiding net unit 110.

[0062] The guide net connection structure 200 of this application forms a continuous and stable connection area between the guide net units 100, which can prevent the edges of the guide net units 100 from easily shifting or lifting during the resin injection process. This avoids local flow obstruction of resin in the connection area, reduces the risk of adhesion between the guide net layer 30 and the blade skin glass fiber, ensures the injection yield, and improves the blade molding quality.

[0063] In some embodiments, the adhesive end 121 of the second flow guide net unit 120 includes a first edge 122 facing the first portion 31 of the first flow guide net unit 110; the first portion 31 of the first flow guide net unit 110 includes a second edge 111 facing the adhesive end 121 of the second flow guide net unit 120; the first edge 122 and the second edge 111 are in contact with each other.

[0064] In other words, the adhesive end 121 of the second guide net unit 120 is placed close to the first part 31 of the first guide net unit 110 on the connecting end 13 of the first guide net unit 110. The adhesive end 121 of the second guide net unit 120 replaces the second part 32 and has the same width as the second part 32 along the second direction Y. This not only improves the flatness and continuity of the connection area, but also ensures the connection area between the two guide net units 100, thereby improving the connection strength.

[0065] In some embodiments, the width L4 of the overlap between the projection of the adhesive end 121 of the second flow guide net unit 120 along the first direction X and the projection of the connection end 13 of the first flow guide net unit 110 along the first direction X is greater than or equal to 10 mm and less than or equal to 30 mm.

[0066] 10mm, 12mm, 15mm, 17mm, 20mm, 22mm, 25mm, 27mm or 30mm.

[0067] The width L4 of the overlap between the projection of the adhesive end 121 of the second flow guide net unit 120 along the first direction X and the projection of the connecting end 13 of the first flow guide net unit 110 along the first direction X is: the overlap width between the second flow guide net unit 120 and the first flow guide net unit 110. It is also the width of the overlapping portion between the area covered by the adhesive end 121 of the second flow guide net unit 120 and the area covered by the connecting end 13 of the first flow guide net unit 110, viewed from a vertical top view (along the first direction X, i.e., the thickness direction). This width can be the same as the width of the second part 32 along the second direction Y.

[0068] This embodiment of the application ensures the connection strength between the first flow guide net unit 110 and the second flow guide net unit 120 by limiting L4 to the range of 10-30mm, and also saves materials and reduces costs.

[0069] like Figure 6 As shown, in a third aspect, embodiments of this application also provide a method for laying a flow guide net unit 100, using at least two flow guide net units 100 of any of the above embodiments, the laying method including the following steps: S10, Provide the first flow guide net unit 110.

[0070] The first guide net unit 110 is in its initial, complete state, i.e., at its connection end 13, the adhesive layer 20 is covered by the second part 32. At this time, the operator lays it in the designated starting position of the blade mold, ensuring that the second surface 12 of its porous membrane layer 10 adheres to the fiberglass skin layup.

[0071] S20. Tear off the second portion 32 of the first flow guide unit 110 to expose at least a portion of the adhesive layer 20.

[0072] The operator grasps the end of the second part 32 at the connection end 13 of the first guide net unit 110 and gently tears it along the third direction Z, thereby exposing the adhesive layer 20 pre-set in the region of the connection end 13 on the first surface 11 of the porous membrane layer 10. The exposed adhesive layer 20 should be clean and have good adhesion to prepare for subsequent bonding.

[0073] S30, provides a second flow guide unit 120.

[0074] The second flow guide unit 120 provided is also in its initial complete state.

[0075] S40. Adhesive end 121 of the second flow guide net unit 120 is adhered to adhesive layer 20 of the first flow guide net unit 110; wherein, adhesive end 121 and connecting end 13 of the second flow guide net unit 120 are arranged opposite to each other along the second direction Y.

[0076] Align the adhesive end 121 of the second flow guide net unit 120 with the connection end 13 area of ​​the exposed adhesive layer 20 of the first flow guide net unit 110. Then, press the adhesive end 121 of the second flow guide net unit 120 onto the adhesive layer 20 of the first flow guide net unit 110.

[0077] After completing S40, the second guide net unit 120 becomes the new first guide net unit 110. By repeating steps S20 to S40 (i.e., tearing off the second part 32 of the new unit connection end 13 and then connecting the next new unit), the third, fourth, and even the Nth guide net units 100 can be connected in sequence, thereby laying out a guide net connection structure 200 of arbitrary length and area, which is reliably connected and continuously isolated on the blade mold.

[0078] While the embodiments disclosed in this application are as described above, the content is merely for the purpose of facilitating understanding of this application and is not intended to limit the invention. Any person skilled in the art to which this application pertains may make any modifications and changes in form and detail of the implementation without departing from the spirit and scope disclosed in this application; however, the scope of protection of this application shall still be determined by the scope defined in the appended claims.

[0079] The above description is merely a specific embodiment of this application. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, substitutions for other connection methods described above can be made by referring to the corresponding processes in the foregoing method embodiments, and will not be repeated here. It should be understood that the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the scope of protection of this application.

Claims

1. A flow guiding net unit, characterized in that, include: A porous membrane layer includes a first surface and a second surface disposed opposite to each other along a first direction, and the porous membrane layer has at least one connection end; An adhesive layer is disposed on a first surface of the porous membrane layer, and at least a portion of the adhesive layer is located at the connection end; A flow guiding mesh layer is disposed on the first surface of the porous membrane layer. The flow guiding mesh layer includes a first portion and a second portion distributed along a second direction. The projection of the second portion along the first direction overlaps with the projection of the connecting end along the first direction, and the second portion peelably covers at least a portion of the adhesive layer. The first direction and the second direction are perpendicular to each other.

2. The flow guiding net unit according to claim 1, characterized in that, The material of the first part is the same as that of the second part, and the flow guide layer is an integrally formed structure.

3. The flow guiding net unit according to claim 2, characterized in that, The flow guide layer has a tear line extending along a third direction, the tear line being located between the first part and the second part; at the location of the tear line, the first part and the second part are partially connected; wherein, the third direction is perpendicular to both the first direction and the second direction.

4. The flow guiding net unit according to claim 1, characterized in that, The width of the second part along the second direction is greater than or equal to 10 mm and less than or equal to 30 mm.

5. The flow guiding net unit according to claim 1, characterized in that, The projection of the adhesive layer along the first direction lies within the projection of the second portion along the first direction.

6. The flow guiding net unit according to claim 1, characterized in that, The adhesive layer includes a plurality of adhesive portions spaced apart along a third direction; wherein the third direction is perpendicular to the first direction and the second direction, respectively.

7. The flow guiding net unit according to claim 1, characterized in that, The adhesive layer is a mesh tape.

8. The flow guiding net unit according to claim 1, characterized in that, The projection of the first portion along the first direction lies within the projection of the porous mold layer along the first direction.

9. The flow guiding net unit according to claim 8, characterized in that, The first part includes two first guide sides disposed opposite to each other along the third direction, the first guide sides being connected to the second part; wherein, the third direction is perpendicular to the first direction and the second direction, respectively; The porous membrane layer further includes two first porous sides disposed opposite each other along the third direction, and the distance between the first porous sides and the first flow guiding side along the third direction is greater than or equal to 10 mm.

10. The flow guiding net unit according to claim 8, characterized in that, The first part includes a second flow guide side, which is disposed opposite to the second part along the second direction; The porous mold layer further includes a second porous side, which is arranged opposite to the connecting end along the second direction, and the distance between the second porous side and the second flow guiding side along the second direction is greater than or equal to 10 mm.

11. A flow guide net connection structure, characterized in that, It includes a plurality of guide net units according to any one of claims 1-10, wherein in two adjacent guide net units, one of the guide net units is a first guide net unit and the other of the guide net units is a second guide net unit; The second part of the first guide net unit is peeled off and torn off. The second guide net unit includes an adhesive end, which is disposed opposite to the connecting end along the second direction. The adhesive end of the second flow guide net unit is bonded to the adhesive layer of the first flow guide net unit.

12. The flow guiding net connection structure according to claim 11, characterized in that, The adhesive end of the second flow guide net unit includes a first edge facing the first portion of the first flow guide net unit; The first portion of the first flow guide unit includes a second edge facing the adhesive end of the second flow guide unit; The first edge and the second edge are in contact with each other.

13. The flow guiding net connection structure according to claim 11, characterized in that, The width of the overlap between the projection of the adhesive end of the second flow guide net unit along the first direction and the projection of the connecting end of the first flow guide net unit along the first direction is greater than or equal to 10 mm and less than or equal to 30 mm.

14. A method for laying a flow guiding net unit, characterized in that, The laying method, using at least two flow guide net units as described in any one of claims 1-10, includes the following steps: Provide the first flow guide net unit; Remove a second portion of the first flow guide unit to expose at least a portion of the adhesive layer; Provide a second flow guide net unit; The adhesive end of the second flow guide net unit is bonded to the adhesive layer of the first flow guide net unit; wherein the adhesive end of the second flow guide net unit and the connecting end are arranged opposite to each other along the second direction.

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