Wind power blade pultrusion plate, girder and girder assembly method

Abstract

The invention provides a wind power blade pultrusion plate, a girder and a girder assembly method. The pultrusion plate comprises an H-shaped section pultrusion plate body and a V-shaped section pultrusion plate body, grooves are formed in the left side and the right side of the H-shaped section pultrusion plate body correspondingly and used for enabling the section of the H-shaped section pultrusion plate body to be in an H shape, connecting faces are arranged on the left side and the right side of the V-shaped section pultrusion plate body correspondingly, and each connecting face comprises a first inclined face and a second inclined face which are connected at a certain included angle. And the connecting surface extends into the groove and is used for realizing the embedding of the pultrusion plate with the H-shaped section and the pultrusion plate with the V-shaped section. By means of the H-shaped section pultrusion plate and the V-shaped section pultrusion plate which are matched with each other, the embedded interlocking capacity between the pultrusion plates is improved, so that dislocation between the pultrusion plates is avoided, stacking caused by the straightness problem is reduced, and when the blade girder is assembled, the bearing uniformity and reliability of the girder are improved. And the pultrusion plate with the H-shaped section can also be used as a part of the girder, so that the performance of a girder splicing seam and an interlayer formed by assembling cannot be attenuated.

Description

Technical Field

[0001] This invention relates to the field of wind turbine blade spar assembly and preparation, and more specifically, to a pultruded plate, a spar, and a spar assembly method for a wind turbine blade. Background Technology

[0002] Wind turbine blades are the core components of wind turbine generators. Their main spans, as the primary load-bearing structure, bear most of the bending loads on the blades, directly affecting their lifespan and safety. Early main spans were formed using vacuum casting (fiberglass layup + resin casting) or prepreg (prepreg fiber lamination + vacuum pressure). These processes suffer from low fiber volume content, susceptibility to wrinkles and bubbles, and even a single defect can render the entire main span unusable, resulting in extremely low tolerance for defects. The introduction of pultrusion technology breaks down the main span into standardized sheets, which are then assembled, stacked, and integrally cast with the blade shell. A defect in a single pultruded sheet only requires replacement of that sheet, eliminating the need to scrap the entire main span, significantly improving tolerance for defects. Therefore, pultruded sheet main spans have gradually become the industry mainstream.

[0003] Despite the significant advantages of pultrusion, several issues still hinder its further development. High fiber content makes controlling the straightness of the sheets more difficult, a problem exacerbated by beveling at the tips. During beam assembly, misalignment or stacking can occur, affecting the uniformity of load-bearing capacity after pouring.

[0004] In addition, two-component structural adhesives are currently used for localized bonding at the beveled edges of pultruded plates, or prefabricated clamps are used for localized shaping in areas with high stacking risk. These two methods do not fundamentally solve the problem, and there is a risk of reduced interfacial performance in areas with structural adhesives or prefabricated clamps, which may pose potential hazards during blade operation.

[0005] CN109732806B is used for pultruded parts of wind turbine blades, a method for instilling wind turbine blades, and wind turbine blades. The pultruded parts are prisms, and the cross-section of the pultruded parts in the thickness direction is a parallelogram. When multiple pultruded parts are spliced ​​together, it is difficult to ensure straightness, and misalignment or stacking is likely to occur, thus affecting the quality and strength of the assembled beam. Summary of the Invention

[0006] In view of this, the present invention aims to provide a pultruded plate for wind turbine blades, a main beam, and a method for assembling the main beam, in order to solve the problem of stacking that easily occurs due to straightness in the prior art.

[0007] To achieve the above objectives, the technical solution of the present invention is implemented as follows:

[0008] On one hand, this invention proposes a pultruded plate for wind turbine blades, comprising an H-shaped cross-section pultruded plate and a V-shaped cross-section pultruded plate. The H-shaped cross-section pultruded plate has grooves on both its left and right sides to ensure its cross-section is H-shaped. The V-shaped cross-section pultruded plate has connecting surfaces on both its left and right sides. Each connecting surface includes a first inclined surface and a second inclined surface, which are connected at a certain angle to ensure the connecting surface has a V-shaped cross-section. The connecting surfaces extend into the grooves to achieve the interlocking of the H-shaped and V-shaped cross-section pultruded plates. This invention's wind turbine blade pultruded plate, through the interlocking H-shaped and V-shaped cross-section pultruded plates, increases the interlocking capability between the pultruded plates, thereby preventing misalignment between adjacent pultruded plates under external forces. This further reduces stacking caused by straightness issues, and helps improve the load-bearing uniformity and reliability of the blade spars when assembled. H-section pultruded plates can not only fit V-section pultruded plates, but also serve as part of the main beam, ensuring that the splice joints and interlayer performance of the assembled main beam will not be degraded.

[0009] Furthermore, a splice seam exists between the groove and the connecting surface. During resin injection, the resin flows to and fills the splice seam. This invention first utilizes the interlocking of the groove and the connecting surface for pre-shaping, and then further utilizes resin injection to form an integral load-bearing structural component. This ensures straightness from two angles and improves the connection strength between the pultruded plates, ensuring the load-bearing performance when assembled into a beam.

[0010] Furthermore, the upper surface of the groove is inclined and mates with the first inclined surface, and the lower surface of the groove is inclined and mates with the second inclined surface. This increases the contact area between the upper surface and the first inclined surface, and the contact area between the lower surface and the second inclined surface, thereby improving the interlocking capability of the H-section pultruded plate and the V-section pultruded plate, and the bonding area of ​​the resin.

[0011] Furthermore, the length of the H-section pultruded plate is the same as that of the V-section pultruded plate. This not only increases the contact area between the two, improving their interlocking ability and resin bonding area, but also allows the H-section pultruded plate to better match the V-section pultruded plate when used as part of a main beam.

[0012] Furthermore, the bottom of the groove is serrated or wavy. This increases the channel area of ​​the splice, thereby helping to fill more resin and bonding the H-section pultruded plate and V-section pultruded plate into a robust integral structure that can better withstand and transfer loads.

[0013] Furthermore, the connection between one side of the tank bottom and the upper surface is curved, and the connection between the other side of the tank bottom and the lower surface is also curved. This curved transition structure allows the resin to flow along a streamlined path, effectively reducing flow resistance and making the resin flow smoother and wetting more uniform. Simultaneously, the curved transition avoids stress concentration in the pultruded plate.

[0014] Furthermore, the H-section pultruded plates and V-section pultruded plates are prepared by a pultrusion molding process. This allows for the rapid replication of the production line using the same molds, processes, and raw materials to produce multiple pultruded plates. The pultruded plates are integral structures, which helps improve the strength of the assembled beams.

[0015] Secondly, the present invention also proposes a wind turbine blade main beam, the main beam comprising multiple sets of the above-mentioned pultruded plates, each set of pultruded plates comprising an H-section pultruded plate and a V-section pultruded plate.

[0016] Thirdly, the present invention also proposes a method for assembling a wind turbine blade spars, comprising the following steps:

[0017] Step 1: Prepare H-section pultruded sheets and V-section pultruded sheets using the pultrusion process, remove the release cloth, and perform grinding and beveling;

[0018] Step 2: Lay the first V-section pultruded plate;

[0019] Step 3: Prepare the first H-section pultruded plate, and assemble the first H-section pultruded plate and the first V-section pultruded plate together so that the connecting surface is locked in the groove on one side;

[0020] Step 4: Prepare the second V-section pultruded plate;

[0021] Step 5: Fit the connecting surface of the second V-section pultruded plate into the groove on the other side of the first H-section pultruded plate;

[0022] Step 6: Repeat steps 2 to 5, alternately laying V-section pultruded sheets and H-section pultruded sheets until one layer is completed;

[0023] Step 7: Place the flow-guiding fabric on the laid pultruded plate, repeat step 6 to lay multiple layers, placing flow-guiding fabric between each layer, until the main beam is assembled.

[0024] Step 8: Inject resin into the top layer of the assembled beam. The resin flows layer by layer until it reaches the bottom layer, forming a complete beam.

[0025] Compared with existing technologies, the pultruded plate, main beam, and main beam assembly method for wind turbine blades described in this invention have the following advantages:

[0026] (1) The wind turbine blade pultruded plate of the present invention increases the interlocking ability between the pultruded plates by using H-shaped cross-section pultruded plates and V-shaped cross-section pultruded plates that cooperate with each other, thereby avoiding misalignment between adjacent pultruded plates under external force, further reducing stacking caused by straightness problems, and helping to improve the load uniformity and reliability of the beam when assembled into a blade beam.

[0027] (2) H-section pultruded plates can not only fit V-section pultruded plates, but also serve as part of the main beam, ensuring that the splice joints and interlayer performance of the assembled main beam will not be degraded, avoiding the use of adhesives or prefabricated plates to only locally shape V-section pultruded plates.

[0028] (3) A wind turbine blade beam includes multiple sets of wind turbine blade pultruded plates, each set of wind turbine blade pultruded plates including an H-section pultruded plate and a V-section pultruded plate. When a single pultruded plate is defective, only the defective pultruded plate needs to be replaced, without scrapping the entire beam. Attached Figure Description

[0029] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0030] Figure 1 This is a schematic diagram of the H-section pultruded plate of the present invention;

[0031] Figure 2 This is a cross-sectional view of the H-section pultruded plate of the present invention;

[0032] Figure 3 This is a schematic diagram of the structure in which the first V-section pultruded plate is placed in this invention;

[0033] Figure 4 This is a schematic diagram of the fitting of the V-section pultruded plate and the H-section pultruded plate of the present invention;

[0034] Figure 5 This is a schematic diagram of the structure in which the second V-shaped pultruded plate is placed in this invention.

[0035] Explanation of reference numerals in the attached figures:

[0036] 1. H-section pultruded plate; 2. V-section pultruded plate; 3. Groove; 4. First inclined surface; 5. Second inclined surface; 6. Upper surface; 7. Lower surface; 8. Groove bottom. Detailed Implementation

[0037] The present invention will be further described below with reference to specific embodiments. First, it should be noted that the data in the following experimental examples were obtained by the inventors through numerous experiments. Due to space limitations, only a portion of these data is shown in the specification, and those skilled in the art can understand and implement the present invention based on this data. These embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the contents of this invention, those skilled in the art can make various modifications or alterations to the invention, and these modifications or alterations also fall within the scope of protection of this application.

[0038] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0039] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0040] A pultruded sheet for wind turbine blades includes an H-shaped cross-section pultruded sheet 1 and a V-shaped cross-section pultruded sheet 2. The H-shaped cross-section pultruded sheet 1 has grooves 3 on its left and right sides to make its cross-section H-shaped. The V-shaped cross-section pultruded sheet 2 has connecting surfaces on its left and right sides. The connecting surfaces include a first inclined surface 4 and a second inclined surface 5, which are connected at a certain angle to make the cross-section of the connecting surface V-shaped. The connecting surfaces extend into the grooves 3 to achieve the fitting of the H-shaped cross-section pultruded sheet 1 and the V-shaped cross-section pultruded sheet 2.

[0041] The wind turbine blade pultruded plate of the present invention, through the interlocking H-section pultruded plate 1 and V-section pultruded plate 2, increases the interlocking capability between the pultruded plates, thereby preventing misalignment between adjacent pultruded plates under external forces. This further reduces stacking caused by straightness issues, and helps improve the load uniformity and reliability of the blade spardle when assembled. The H-section pultruded plate 1 not only serves to interlock with the V-section pultruded plate 2, but also functions as part of the spardle itself, ensuring that the splice joints and interlayer performance of the assembled spardle do not degrade. This avoids the risk of reduced interface performance in areas where the V-section pultruded plate 2 is not in contact with the prefabricated plate or adhesive when only partially shaped using glue or prefabricated plates.

[0042] The included angle is an acute angle to better ensure that the connecting surface and the groove 3 fit together.

[0043] There is a splicing seam between the groove 3 and the connecting surface. When the resin is injected, the resin flows to the splicing seam and fills it. This invention first uses the fitting of the groove 3 and the connecting surface for pre-shaping, and then further uses resin injection to form an integral load-bearing structural component. This ensures straightness from two angles and improves the connection strength between the pultruded plates, ensuring the load-bearing performance when assembled into a beam.

[0044] As a preferred example of the present invention, the upper surface 6 of the groove 3 is inclined and cooperates with the first inclined surface 4, and the lower surface 7 of the groove 3 is inclined and cooperates with the second inclined surface 5, which increases the contact area between the upper surface 6 and the first inclined surface 4, and the contact area between the lower surface 7 and the second inclined surface 5, thereby improving the interlocking capability of the H-section pultruded plate 1 and the V-section pultruded plate 2, and the bonding area of ​​the resin. It should be noted that even though the groove 3 and the connecting surface are in contact, there is still a small space between them for splicing.

[0045] As a preferred example of the present invention, the length of the H-section pultruded plate 1 and the length of the V-section pultruded plate 2 are the same. This not only increases the contact area between the two, improving their interlocking ability and resin bonding area, but also allows the H-section pultruded plate 1 to better match the V-section pultruded plate 2 when used as part of a main beam. The length direction mentioned in this invention refers to... Figure 2 Front and back directions.

[0046] As a preferred example of the present invention, the bottom 8 of the groove 3 is serrated or wavy, which can increase the channel area of ​​the splice seam, thereby helping to fill more resin and bond the H-section pultruded plate 1 and the V-section pultruded plate 2 into a solid integral structure, which can better bear and transmit loads.

[0047] The connection between one side of the bottom 8 and the upper surface 6 is curved, and the connection between the other side of the bottom 8 and the lower surface 7 is also curved. During resin injection, the curved transition structure allows the resin to flow along a streamlined path, effectively reducing flow resistance and making the resin flow smoother and wetting more uniform. At the same time, the curved transition avoids stress concentration in the pultruded plate, improving its service life.

[0048] The H-section pultruded plate 1 and V-section pultruded plate 2 are prepared by pultrusion molding process, which allows for rapid replication of the production line using the same mold, process and raw materials to produce multiple pultruded plates. Moreover, the pultruded plates are integral structures, which helps to improve the strength of the assembled beam.

[0049] The present invention provides a wind turbine blade main beam comprising multiple sets of wind turbine blade pultruded plates, each set of wind turbine blade pultruded plates comprising an H-section pultruded plate 1 and a V-section pultruded plate 2. In the event of a defect in a single pultruded plate, only the defective pultruded plate needs to be replaced, without the need to scrap the entire beam.

[0050] For the main beam, the H-section pultruded plate 1 not only serves to interlock the V-section pultruded plate 2, but also connects two adjacent V-section pultruded plates 2, and the H-section pultruded plate 1 itself is also a component structure of the main beam.

[0051] This invention also proposes a method for assembling a wind turbine blade spars, comprising the following steps:

[0052] Step 1: Prepare H-section pultruded plate 1 and V-section pultruded plate 2 using the pultrusion process, remove the release cloth, and perform grinding and beveling.

[0053] Step 2: As Figure 3 As shown, the first V-section pultruded plate 2 is laid;

[0054] Step 3: As Figure 4 As shown, prepare the first H-section pultruded plate 1, and assemble the first H-section pultruded plate 1 and the first V-section pultruded plate 2 so that the connecting surface is locked in the groove 3 on one side;

[0055] Step 4: Prepare the second V-section pultruded plate 2;

[0056] Step 5: As Figure 5 As shown, the connecting surface of the second V-section pultruded plate 2 is inserted into the groove 3 on the other side of the first H-section pultruded plate 1 (i.e., the first H-section pultruded plate 1);

[0057] Step 6: Repeat steps 2 to 5, alternately laying V-section pultruded plates 2 and H-section pultruded plates 1 until one layer is laid;

[0058] Step 7: Place the flow-guiding fabric on the laid pultruded plate, repeat step 6 to lay multiple layers, placing flow-guiding fabric between each layer, until the main beam is assembled.

[0059] Step 8: Inject resin into the top layer of the assembled beam. The resin flows layer by layer until it reaches the bottom layer, forming a complete beam.

[0060] After the main beam of the present invention is assembled and poured, it is placed in the blade mold.

[0061] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various alterations and modifications without departing from the spirit and scope of the invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A pultruded plate for wind turbine blades, characterized in that, The pultruded plate includes an H-shaped cross section pultruded plate (1) and a V-shaped cross section pultruded plate (2). The H-shaped cross section pultruded plate (1) has grooves (3) on its left and right sides to make the cross section of the H-shaped cross section pultruded plate (1) H-shaped. The V-shaped cross section pultruded plate (2) has connecting surfaces on its left and right sides. The connecting surfaces include a first inclined surface (4) and a second inclined surface (5). The first inclined surface (4) and the second inclined surface (5) are connected at a certain angle to make the cross section of the connecting surface V-shaped. The connecting surfaces extend into the grooves (3) to realize the fitting of the H-shaped cross section pultruded plate (1) and the V-shaped cross section pultruded plate (2).

2. The pultruded plate according to claim 1, characterized in that, There is a splicing seam between the groove (3) and the connecting surface. When the resin is injected, the resin flows to the splicing seam and fills the splicing seam.

3. The pultruded plate according to claim 1, characterized in that, The upper surface (6) of the groove (3) is inclined and cooperates with the first inclined surface (4), and the lower surface (7) of the groove (3) is inclined and cooperates with the second inclined surface (5).

4. The pultruded plate according to claim 1, characterized in that, The length of the H-section pultruded plate (1) is the same as the length of the V-section pultruded plate (2).

5. The pultruded plate according to claim 3, characterized in that, The bottom (8) of the groove 3 is serrated or wavy.

6. The pultruded plate according to claim 5, characterized in that, The connection between one side of the bottom (8) and the upper surface (6) is arc-shaped, and the connection between the other side of the bottom (8) and the lower surface (7) is arc-shaped.

7. The pultruded plate according to claim 1, characterized in that, The H-section pultruded plate (1) and the V-section pultruded plate (2) are prepared by pultrusion molding process.

8. A wind turbine blade main beam, characterized in that, The main beam includes multiple sets of pultruded plates as described in any one of claims 1 to 7, each set of pultruded plates including an H-section pultruded plate (1) and a V-section pultruded plate (2).

9. A method for assembling a wind turbine blade spars, characterized in that, Includes the following steps: Step 1: Prepare H-section pultruded plates (1) and V-section pultruded plates (2) using the pultrusion process, remove the release cloth, and perform grinding and beveling; Step 2: Lay the first V-section pultruded plate (2); Step 3: Prepare the first H-section pultruded plate (1), assemble and splice the first H-section pultruded plate (1) and the first V-section pultruded plate (2) so that the connecting surface is stuck in the groove (3) on one side; Step 4: Prepare the second V-section pultruded plate (2); Step 5: Insert the connecting surface of the second V-section pultruded plate (2) into the groove (3) on the other side of the first H-section pultruded plate (1); Step 6: Repeat steps 2 to 5, alternately laying V-section pultruded plates (2) and H-section pultruded plates (1) until one layer is laid; Step 7: Place the flow-guiding fabric on the laid pultruded plate, repeat step 6 to lay multiple layers, placing flow-guiding fabric between each layer, until the main beam is assembled. Step 8: Inject resin into the top layer of the assembled beam. The resin flows layer by layer until it reaches the bottom layer, forming a complete beam.

Images