Blade connecting structure of large sectional type wind generating set

Abstract

The embodiment of the utility model provides a blade connecting structure of a large sectional type wind generating set, which is applied to the butt joint between blade sections of a wind generating set and comprises a connecting component, the two ends of the connecting component are respectively provided with a bonding part, and the bonding parts extend into inner cavities of the blade sections of the wind generating set so as to expand bonding surfaces. And the bonding part is bonded with the inner cavity wall of the blade section of the wind power generator unit. According to the sectional type wind power unit blade connecting structure, the bonding parts at the two ends of the connecting component extend into the inner cavity of the wind power unit blade to be bonded to the wall of the inner cavity of the wind power unit blade, the bonding area is expanded through the bonding parts, and the bonding strength can be improved; reliable connection between blade sections can be achieved on the premise that it is guaranteed that the weight of the blade is not increased too much.

Description

Technical Field

[0001] This utility model belongs to the field of wind turbine blade technology, and in particular relates to a large segmented wind turbine blade connection structure. Background Technology

[0002] The trend towards larger wind turbine blades is currently underway, with onshore wind turbine blades already reaching lengths of 130 meters. The manufacturing difficulty is increasing year by year, and longer blades also present greater transportation challenges. Segmented blades are considered one of the mainstream solutions to address this industry pain point.

[0003] There are currently three main methods for connecting segmented blades:

[0004] (1) Adhesive connection. Adhesive connection refers to connecting at least two sections of segmented blades with the help of structural adhesives or other materials. The main connection areas are the main beam, web, etc. By designing the structure of the adhesive parts, the adhesive area is maximized to enhance the strength of the entire connection.

[0005] (2) Bolted connection. The mechanical connection scheme using T-bolts, embedded bolts, flange-bolt connection, etc. mainly involves designing a mechanical connection structure and using the preload of bolts to connect at least two sections of the blade. It has reliable mechanical properties but is prone to introducing too much additional weight.

[0006] (3) Pipe and rod connection. At least two sections are connected by steel bars or pipes and rods, and fixed by resin injection or welding. However, the on-site injection process is complicated and the curing effect is unsatisfactory.

[0007] For example, patent number CN114562410A discloses a segmented wind turbine blade, its manufacturing method, and its assembly method. This solution increases the overall bonding area by setting oblique surfaces between blade segments, and ensures the compatibility between the bonding surfaces of the segments by laying a release medium layer on the oblique surfaces during the blade manufacturing process. However, the connection strength of this solution in large-sized segmented blades of hundreds of meters still needs to be investigated. Utility Model Content

[0008] In view of the above-mentioned problems existing in the prior art, the purpose of this utility model embodiment is to provide a large segmented wind turbine blade connection structure.

[0009] The technical solution adopted in this embodiment of the utility model is a large segmented wind turbine blade connection structure, which is applied to the docking between wind turbine blade segments. It includes a connecting member, and both ends of the connecting member are constructed with adhesive parts. The adhesive parts extend into the inner cavity of the wind turbine blade segment to expand the adhesive surface. The adhesive parts are bonded to the inner cavity wall of the wind turbine blade segment.

[0010] The connecting component includes a first connector and a second connector. The first connector and the second connector are provided with a reinforcing connection structure. The first connector and the second connector are connected at one end through the reinforcing connection structure, and the other end of the first connector and the second connector extends into the inner cavity of the wind turbine blade segment to form an adhesive part.

[0011] Furthermore, the reinforced connection structure includes an insertion part and a groove-shaped part, the insertion part cooperating with the groove-shaped part, the insertion part and the groove-shaped part being respectively constructed at the ends of the mating ends of the first connector and the second connector, the insertion part being inserted into the groove-shaped part when the first connector and the second connector are mated.

[0012] Furthermore, the reinforced connection structure also includes a plurality of fasteners, a plurality of first connecting holes and a plurality of second connecting holes. The first connecting holes and the second connecting holes are respectively constructed on the insertion part and the groove-shaped part. When the insertion part is inserted into the groove-shaped part, the first connecting holes and the second connecting holes correspond one-to-one to form a fixing hole that cooperates with the fasteners. The fasteners are inserted into the fixing holes to fix the first connecting member and the second connecting member.

[0013] Furthermore, the fastener is a bolt or a rivet.

[0014] Furthermore, an adhesive coating is provided on the outer wall of the insertion part, and when the insertion part is inserted into the groove, the adhesive coating will bond the outer wall of the insertion part to the inner wall of the groove.

[0015] Furthermore, the first connector and the second connector are configured to fit the shape of the inner cavity of the wind turbine blade segment, so that the adhesive portion on the first connector and the second connector fits into the inner cavity wall of the wind turbine blade segment.

[0016] Furthermore, it also includes a pneumatic housing that covers the connecting components, and both ends of the pneumatic housing are respectively connected to the wind turbine blade segments.

[0017] Furthermore, the pneumatic housing includes a windward pneumatic housing and a leeward pneumatic housing, which are overlapped to form an enclosing structure to cover the connecting member, and the windward and leeward pneumatic housings are fixedly connected to the connecting member.

[0018] Compared with the prior art, the segmented wind turbine blade connection structure proposed in this utility model extends the adhesive portions at both ends of the connecting component into the inner cavity of the wind turbine blade and adheres them to the inner wall of the wind turbine blade. The adhesive portions expand the adhesive area, which helps to improve the adhesive strength and can achieve a reliable connection between blade segments while ensuring that the weight of the blade is not increased significantly.

[0019] It should be understood that the foregoing general description and the following detailed description are exemplary and illustrative only, and are not intended to limit the present invention.

[0020] The overview of various implementations or examples of the technology described in this utility model is not a complete disclosure of the full scope or all features of the disclosed technology. Attached Figure Description

[0021] In drawings that are not necessarily drawn to scale, the same reference numerals may describe similar parts in different views. The same reference numerals with or without letter suffixes may indicate different instances of similar parts. The drawings generally illustrate various embodiments by way of example rather than limitation and, together with the description and claims, serve to explain embodiments of the utility model. Where appropriate, the same reference numerals are used in all drawings to refer to the same or similar parts. Such embodiments are illustrative and not intended to be exhaustive or exclusive embodiments of the apparatus or method.

[0022] Figure 1 This is an installation diagram of an embodiment of the present utility model.

[0023] Figure 2 This is a partial enlarged view of an embodiment of the present utility model.

[0024] Figure 3 This is a schematic diagram of the installation section of an embodiment of the present invention. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model 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 utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0026] Unless otherwise defined, the technical or scientific terms used in this utility model shall have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0027] To keep the following description of the embodiments of this utility model clear and concise, detailed descriptions of known functions and known components are omitted.

[0028] See Figures 1 to 3 This utility model provides a large-scale segmented wind turbine blade connection structure for connecting blade segments 2 of a wind turbine. It includes a connecting member 1, with adhesive portions 11 at both ends. These adhesive portions 11 extend into the inner cavity of the wind turbine blade segment 2 to expand the bonding surface, and are bonded to the inner wall of the blade segment 2. This technical solution expands the bonding area by extending the adhesive portions 11 at both ends of the connecting member 1 into the inner cavity of the wind turbine blade and bonding them to the inner wall of the blade. This improves the bonding strength and enables reliable connection between blade segments while minimizing the increase in blade weight.

[0029] The connecting member 1 includes a first connecting member 12 and a second connecting member 13. The first connecting member 12 and the second connecting member 13 are provided with a reinforcing connecting structure. The first connecting member 12 and the second connecting member 13 are connected at one end through the reinforcing connecting structure, and the other end of the first connecting member 12 and the second connecting member 13 extends into the inner cavity of the wind turbine blade segment 2 to form an adhesive part 11.

[0030] Because the wind turbine blade segment 2 is relatively heavy, and the adhesive part 11 needs to be bonded to the inner wall of the wind turbine blade segment 2 before the adhesive cures, the connecting component 1 is composed of a first connector 12 and a second connector 13 in segments. They can be bonded separately during installation, and it is not necessary to keep the wind turbine blade segment 2 in a butt joint state when the adhesive cures. After the adhesive cures, the first connector 12 and the second connector 13 can be connected, which facilitates the installation operation.

[0031] In some embodiments, the reinforcing connection structure includes an insertion portion 14 and a grooved portion 15, the insertion portion 14 cooperating with the grooved portion 15. The insertion portion 14 and the grooved portion 15 are respectively constructed at the ends of the mating ends of the first connector 12 and the second connector 13. When the first connector 12 and the second connector 13 are mated, the insertion portion 14 is inserted into the grooved portion 15. A specific form of reinforcing connection structure is provided, employing the form of the insertion portion 14 inserting into the grooved portion 15, which simplifies the mating method.

[0032] In some embodiments, the reinforcing connection structure further includes a plurality of fasteners 16, a plurality of first connecting holes 17, and a plurality of second connecting holes 18. The first connecting holes 17 and the second connecting holes 18 are respectively formed on the insertion portion 14 and the groove portion 15. When the insertion portion 14 is inserted into the groove portion 15, the first connecting holes 17 and the second connecting holes 18 correspond one-to-one to form fixing holes that mate with the fasteners 16. The fasteners 16 are inserted into the fixing holes to fix the first connector 12 and the second connector 13. Fixing the first connector 12 and the second connector 13 by inserting the fasteners 16 into the fixing holes can effectively prevent the first connector 12 and the second connector 13 from becoming loose.

[0033] Specifically, the fastener 16 can be a bolt or a rivet.

[0034] In some embodiments, an adhesive coating is provided on the outer wall of the insertion portion 14. When the insertion portion 14 is inserted into the grooved portion 15, the adhesive coating bonds the outer wall of the insertion portion 14 to the inner wall of the grooved portion 15. The insertion portion 14 and the grooved portion 15 have a large contact surface area. The adhesive coating on the outer wall of the insertion portion 14, after curing, further enhances the connection strength between the first connector 12 and the second connector 13.

[0035] In some embodiments, the first connector 12 and the second connector 13 are configured to fit the shape of the inner cavity of the wind turbine blade segment 2, so that the adhesive portion 11 on the first connector 12 and the second connector 13 fits against the inner cavity wall of the wind turbine blade segment 2. The inner cavity of the wind turbine blade segment 2 has components such as a web, a main beam, and an auxiliary beam, and the surfaces of the web, the main beam, and the auxiliary beam constitute the inner cavity wall of the wind turbine blade segment 2.

[0036] In some embodiments, the system further includes an aerodynamic housing that covers the connecting member 1, with both ends of the aerodynamic housing respectively connected to the wind turbine blade segment 2. Specifically, the aerodynamic housing includes a windward aerodynamic housing 3 and a leeward aerodynamic housing 4, which are overlapped to form an enclosing structure to cover the connecting member 1. The windward aerodynamic housing 3 and the leeward aerodynamic housing 4 are fixedly connected to the connecting member 1.

[0037] During installation, the position of the bonding part 11 should first be determined on the wind turbine blade segment 2. Then, sufficient structural adhesive should be applied to the bonding part 11 and the corresponding bonding position on the wind turbine blade segment 2 to bond the bonding part 11 for the installation of the first connector 12 and the second connector 13. After the structural adhesive has fully cured, subsequent work can be carried out.

[0038] Before inserting the insertion part 14 into the grooved part 15, an adhesive coating (such as structural adhesive or high-strength adhesive) is evenly applied to the surface of the insertion part 14, and then the insertion part 14 is inserted into the grooved part 15. Subsequently, the fastener 16 is installed, and the fastener 16 is inserted into the fixing hole to fix the first connector 12 and the second connector 13. The fastener 16 can be a lightweight, high-strength bolt made of composite materials.

[0039] Connecting component 1 can be installed at the joint positions of the main beam, web, and shell on the wind turbine blade segment 2, according to the required connection strength. Connecting component 1 can also be added at other joint positions, but it should be noted that the positions of connecting components 1 should not interfere with each other.

[0040] Finally, the windward aerodynamic housing 3 and the leeward aerodynamic housing 4 are installed. The aerodynamic protective housing is fixedly connected to the connecting component 1 by adhesive bonding, so as to adhere to the outer surface of the connecting area to ensure the aerodynamic performance of the segmented blades at the connecting part.

[0041] The above description is intended to be illustrative and not restrictive. Those skilled in the art can make variations, modifications, substitutions, and alterations to the above embodiments within the scope of this disclosure. Moreover, the above examples (or one or more of them) can be used in combination with each other, and these embodiments can be combined with each other in various combinations or arrangements.

Claims

1. A large segmented wind turbine blade connection structure, used for the docking of wind turbine blade segments (2), characterized in that, The device includes a connecting member (1), both ends of which are provided with adhesive portions (11). The adhesive portions (11) extend into the inner cavity of the wind turbine blade segment (2) to expand the adhesive surface. The adhesive portions (11) are bonded to the inner wall of the wind turbine blade segment (2). The connecting member (1) includes a first connecting member (12) and a second connecting member (13). The first connecting member (12) and the second connecting member (13) are provided with a reinforcing connection structure. The first connecting member (12) and the second connecting member (13) are connected at one end through the reinforcing connection structure, and the other end of the first connecting member (12) and the second connecting member (13) extends into the inner cavity of the wind turbine blade segment (2) to form the adhesive part (11).

2. The blade connection structure of a large segmented wind turbine generator set according to claim 1, characterized in that, The reinforced connection structure includes an insertion part (14) and a groove part (15). The insertion part (14) and the groove part (15) cooperate with each other. The insertion part (14) and the groove part (15) are respectively constructed at the ends of the mating ends of the first connector (12) and the second connector (13). When the first connector (12) and the second connector (13) are mated, the insertion part (14) is inserted into the groove part (15).

3. The blade connection structure of a large segmented wind turbine generator set according to claim 2, characterized in that, The reinforced connection structure also includes several fasteners (16), several first connecting holes (17) and several second connecting holes (18). The first connecting holes (17) and the second connecting holes (18) are respectively constructed on the insertion part (14) and the groove part (15). When the insertion part (14) is inserted into the groove part (15), the first connecting holes (17) and the second connecting holes (18) correspond one-to-one to form a fixing hole that cooperates with the fasteners (16). The fasteners (16) are inserted into the fixing hole to fix the first connecting member (12) and the second connecting member (13).

4. The blade connection structure of a large segmented wind turbine generator set according to claim 3, characterized in that, The fastener (16) is a bolt or rivet.

5. A large segmented wind turbine blade connection structure according to any one of claims 2 to 4, characterized in that, An adhesive coating is provided on the outer wall of the insertion part (14), and when the insertion part (14) is inserted into the groove (15), the adhesive coating will bond the outer wall of the insertion part (14) to the inner wall of the groove (15).

6. The blade connection structure of a large segmented wind turbine generator set according to claim 1, characterized in that, The first connector (12) and the second connector (13) are configured to fit the shape of the inner cavity of the wind turbine blade segment (2) so that the adhesive portion (11) on the first connector (12) and the second connector (13) fits against the inner cavity wall of the wind turbine blade segment (2).

7. The blade connection structure of a large segmented wind turbine generator set according to claim 1, characterized in that, It also includes an aerodynamic housing that covers the connecting member (1), and the two ends of the aerodynamic housing are respectively connected to the wind turbine blade segment (2).

8. The blade connection structure of a large segmented wind turbine generator set according to claim 7, characterized in that, The pneumatic housing includes a windward pneumatic housing (3) and a leeward pneumatic housing (4). The windward pneumatic housing (3) and the leeward pneumatic housing (4) are overlapped to form an enclosed structure to cover the connecting member (1). The windward pneumatic housing (3) and the leeward pneumatic housing (4) are fixedly connected to the connecting member (1).

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