Blade lengthening connection process, blade lengthening connection structure and wind turbine

Abstract

The application provides a blade extension connection process, a blade extension connection structure and a wind driven generator. The blade extension connection process comprises the following steps: a part of a connecting beam is arranged in a first blade segment to be extended, and the connecting beam is connected with two opposite side walls in the first blade segment to be extended; and the part of the connecting beam exposed from the first blade segment to be extended is arranged in a second blade segment to be extended and connected with the second blade segment to be extended. The application solves the problem that the adaptability of the blade to the actual environment is low in the prior art.

Description

Technical Field

[0001] The present invention relates to the technical field of wind power, and in particular to a blade extension connection process, a blade extension connection structure and a wind turbine. Background Art

[0002] A wind turbine blade generally consists of a shell, a spar cap, and a web. The web is located within the shell and connected to the shell via the spar cap. Traditional blades can only be used individually, and their size is essentially determined during processing and cannot be changed later. This results in each blade being able to adapt to a specific scenario. If the blade does not meet actual requirements due to factors such as size problems, the blade will need to be reprocessed and cannot be used, resulting in low adaptability to the actual environment and serious waste. Summary of the Invention

[0003] The main purpose of the present invention is to provide a blade extension connection process, a blade extension connection structure and a wind turbine generator, so as to solve the problem of low adaptability of blades to actual environments in the prior art.

[0004] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, a blade extension connection process is provided, comprising: a portion of a connecting beam is passed through a first blade segment to be extended, and the connecting beam is connected to two opposite side walls of the first blade segment to be extended; and a portion of the connecting beam exposed from the first blade segment to be extended is passed through a second blade segment to be extended and connected to the second blade segment to be extended.

[0005] Furthermore, the connecting beam includes a frame and a sealing airbag, and the blade extension connection process also includes: before connecting the connecting beam to the opposite side walls of the first blade segment to be extended, attaching a fiber cloth impregnated with resin to the outer side of the sealing airbag; when the connecting beam is inserted into the first blade segment to be extended, the fiber cloth adheres to the inner wall of the first blade segment to be extended, and hot air is introduced into the sealing airbag to heat and cure the fiber cloth, so that the cured fiber cloth is connected to the first blade segment to be extended.

[0006] Furthermore, the frame includes a main frame and a support frame, and the support frame is detachably arranged in the main frame. The blade extension connection process also includes: after the fiber cloth is cured and connected, the support frame and the sealing airbag are removed from the main frame, and the cured fiber cloth remains connected to the first blade segment to be extended.

[0007] Furthermore, the blade extension connection process also includes: when connecting the connecting beam and the second blade segment to be extended, coating structural adhesive on opposite sides of the fiber cloth, heating the outer side of the second blade segment to be extended to solidify the structural adhesive, and bonding the fiber cloth to the inner wall of the second blade segment to be extended through the structural adhesive.

[0008] Furthermore, the blade extension connection process also includes: after connecting the connecting beam and the second blade segment to be extended, attaching a fiber cloth impregnated with resin to the outer side of the connection between the first blade segment to be extended and the second blade segment to be extended, and heating and curing the fiber cloth.

[0009] Furthermore, the blade extension connection process also includes: after connecting the connecting beam and the second blade segment to be extended, coating structural adhesive on the outer side of the connection between the first blade segment to be extended and the second blade segment to be extended, and heating and curing the structural adhesive.

[0010] Furthermore, the blade extension connection process also includes: before the connecting beam is inserted into the first blade segment to be extended, the first blade is cut off, and the root segment of the cut-off first blade is used as the first blade segment to be extended; the second blade is switched, and the tip segment of the cut-off second blade is used as the second blade segment to be extended.

[0011] According to another aspect of the present invention, a blade extension connection structure is provided for performing the above-mentioned blade extension connection process, the blade extension connection structure comprising: a first blade segment to be extended; a second blade segment to be extended; a connecting beam, the connecting beam comprising a frame and a sealing airbag, the sealing airbag being detachably wrapped around the outside of the frame, the outer surface of the sealing airbag being capable of being attached with a fiber cloth impregnated with resin, a portion of the fiber cloth being cured and connected to the first blade segment to be extended, and another portion of the fiber cloth being bonded to the second blade segment to be extended.

[0012] Furthermore, the frame includes a main frame and a support frame, the main frame has a cavity, the support frame is detachably arranged in the cavity, and the main frame and the support frame jointly support the sealed airbag.

[0013] According to another aspect of the present invention, a wind turbine is provided, comprising the above-mentioned blade extension connection structure.

[0014] By applying the technical solution of the present invention, by adopting the above-mentioned connection process, a connecting beam is used to realize the connection between the two blade segments. In this way, when the length of the blade does not match the actual situation, the two blade segments can be connected by the connecting beam, so that the blade can be extended in length as needed to meet the use requirements. At the same time, the above-mentioned setting method can be carried out directly at the construction site, and there is no need to drag the blade back to the processing plant, which facilitates on-site modification and is convenient and quick. Specifically, when the length of the blade is insufficient, the two blades can be cut to form four blade segments, two of which are selected as the connection objects, and then a part of the connecting beam is passed through the first blade segment to be extended, so that the connecting beam is connected to the first blade segment to be extended, and then the other part of the connecting beam is passed through the second blade segment to be extended, so that the connecting beam is connected to the second blade segment to be extended. In this way, the two blade segments to be extended are connected to form a whole through the connecting beam, thereby extending the length of the obtained blade, improving the adaptability of the blade to the actual environment, and achieving the purpose of the blade meeting the needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0016] Figure 1 A flow chart showing the blade extension connection process of the present invention is shown;

[0017] Figure 2 A schematic structural diagram showing the connection between the connecting beam and the first blade segment to be extended is shown;

[0018] Figure 3 A flow chart showing the overall blade extension connection process of the present invention is shown.

[0019] The above drawings include the following reference numerals:

[0020] 10. Connecting beam; 11. Frame; 12. Sealing airbag; 20. First blade segment to be extended. DETAILED DESCRIPTION

[0021] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0022] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0023] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity direction; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above directional words are not used to limit the present invention.

[0024] In order to solve the problem in the prior art that blades have low adaptability to actual environments, the present invention provides a blade extension connection process, a blade extension connection structure and a wind turbine.

[0025] like Figures 1 to 3 The blade extension connection process shown includes: a portion of the connecting beam 10 is passed through the first blade segment 20 to be extended, and the connecting beam 10 is connected to the opposite side walls of the first blade segment 20 to be extended; the portion of the connecting beam 10 exposed from the first blade segment 20 to be extended is passed through the second blade segment to be extended and connected to the second blade segment to be extended.

[0026] This embodiment utilizes the aforementioned connection process, utilizing a connecting beam 10 to connect the two blade segments. This allows the two blade segments to be connected via the connecting beam 10 when the blade length is not suitable for the actual situation, allowing the blade to be extended as needed to meet the desired use. Furthermore, the aforementioned configuration can be performed directly at the construction site, eliminating the need to return the blade to the processing plant, making on-site modification convenient and quick. Specifically, when the blade length is insufficient, two blade segments can be cut to form four segments, two of which are selected for connection. A portion of the connecting beam 10 is then inserted into the first blade segment 20 to be extended, connecting the connecting beam 10 to the first blade segment 20. Another portion of the connecting beam 10 is then inserted into the second blade segment to be extended, connecting the connecting beam 10 to the second blade segment. This allows the two blade segments to be connected via the connecting beam 10 to form a single unit, thereby extending the length of the resulting blade, improving the blade's adaptability to the actual environment, and achieving the desired blade fit.

[0027] like Figure 3As shown, in this embodiment, the connecting beam 10 includes a frame 11 and a sealing airbag 12. The blade extension connection process further includes: before connecting the connecting beam 10 to the opposite inner walls of the first blade segment 20 to be extended, attaching a resin-impregnated fiber cloth to the outer sides of the sealing airbag 12; when the connecting beam 10 is inserted into the first blade segment 20 to be extended, the fiber cloth adheres to the inner wall of the first blade segment 20 to be extended; hot air is introduced into the sealing airbag 12 to heat and cure the fiber cloth, and the cured fiber cloth is connected to the first blade segment 20 to be extended. In other words, in this embodiment, the connection between the connecting beam 10 and the first blade segment 20 to be extended is achieved through resin curing. That is, due to the setting of the sealing airbag 12, the outer side of the sealing airbag 12 can be attached with a fiber cloth impregnated with resin, so that when a part of the connecting beam 10 is extended into the first blade segment to be extended 20, the fiber cloth is connected to the inner wall of the first blade segment to be extended 20. Then, hot air can be introduced into the sealing airbag 12 to heat and cure the resin, thereby achieving the curing of the fiber cloth and achieving a reliable connection between the fiber cloth and the first blade segment to be extended 20, thereby achieving a reliable and stable connection between the first blade segment to be extended 20 and the second blade segment to be extended.

[0028] The frame 11 of this embodiment includes a main frame and a support frame. The support frame is detachably disposed within the main frame. The blade extension connection process further includes: after the fiber cloth is cured and connected, the support frame and the sealing airbag 12 are removed from the main frame, and the cured fiber cloth remains connected to the first blade segment to be extended 20. Since there should not be excessive internal structure after the first blade segment to be extended 20 and the second blade segment to be extended are connected, this embodiment uses a detachable main frame and support frame. The main frame is a simple rectangular parallelepiped frame, and the support frame supports the sealing airbag 12 within the main frame. In this way, the sealing airbag 12 and the support frame can be removed after the fiber cloth is cured, leaving only the main frame, which has little impact, within the blade, thereby ensuring that the blade meets the requirements after connection.

[0029] Unlike the connection method between the aforementioned connecting beam 10 and the first blade segment to be extended 20, since the sealing airbag 12 has been removed, and considering that it is inconvenient to allow hot air to pass through when the first blade segment to be extended 20 is docked with the second blade segment to be extended, the remaining portion of the connecting beam 10 in this embodiment is connected to the second blade segment to be extended by means of structural adhesive bonding. Specifically, the blade extension connection process also includes: when connecting the connecting beam 10 to the second blade segment to be extended, applying structural adhesive to opposite sides of the fiber cloth, heating the outer side of the second blade segment to be extended so that the structural adhesive solidifies, and bonding the fiber cloth to the inner wall of the second blade segment to be extended through the structural adhesive. In this way, the portion of the fiber cloth exposed outside the first blade segment to be extended 20 is bonded to the second blade segment to be extended through the structural adhesive, thereby achieving a reliable connection between the first blade segment to be extended 20 and the second blade segment to be extended through the fiber cloth.

[0030] Optionally, the blade extension connection process further includes: after connecting the connecting beam 10 to the second blade segment to be extended, attaching a resin-impregnated fiber cloth to the exterior of the connection between the first blade segment to be extended 20 and the second blade segment to be extended, and heating and curing the fiber cloth. In addition to connecting the interior of the first blade segment to be extended 20 to the interior of the second blade segment to be extended via the fiber cloth, this embodiment further strengthens the connection at the exterior of the connection between the first blade segment to be extended 20 and the second blade segment to be extended. Specifically, the connection is further strengthened by curing the resin-impregnated fiber cloth on the exterior surface of the connection between the first blade segment to be extended 20 and the second blade segment to be extended, thereby ensuring the strength of the connection between the first blade segment to be extended 20 and the second blade segment to be extended, and thereby ensuring the overall strength of the extended blade.

[0031] In addition to the above-mentioned method of curing the fiber cloth impregnated with resin, the connection strengthening can also be achieved by coating the connection between the first blade segment to be extended 20 and the second blade segment to be extended with structural adhesive. Specifically, the blade extension connection process also includes: after connecting the connecting beam 10 and the second blade segment to be extended, coating the structural adhesive on the outside of the connection between the first blade segment to be extended 20 and the second blade segment to be extended, and heating and curing the structural adhesive, thereby improving the connection strength between the first blade segment to be extended 20 and the second blade segment to be extended through the bonding of the structural adhesive. It should be noted that the above-mentioned two methods of curing the fiber cloth impregnated with resin and the structural adhesive bonding can be selected as needed to use only one of them, or both methods can be used at the same time, as long as the connection strength between the first blade segment to be extended 20 and the second blade segment to be extended can be strengthened.

[0032] In this embodiment, the blade extension and connection process further includes: before inserting the connecting beam 10 into the first blade segment 20 to be extended, cutting the first blade, using the cut root segment of the first blade as the first blade segment 20 to be extended, and switching the second blade, using the cut tip segment of the second blade as the second blade segment to be extended. Of course, the specific portion of the first blade segment 20 to be extended and the specific portion of the second blade segment to be extended can be interchanged as needed, and is not limited to the selection method described in this embodiment.

[0033] like Figure 2 As shown, this embodiment also provides a blade extension connection structure for performing the above-mentioned blade extension connection process. The blade extension connection structure includes a first blade segment 20 to be extended, a second blade segment to be extended, and a connecting beam 10. The connecting beam 10 includes a frame 11 and a sealing airbag 12. The sealing airbag 12 is detachably wrapped around the outside of the frame 11. The outer surface of the sealing airbag 12 can be attached with a fiber cloth impregnated with resin. A portion of the fiber cloth is cured and connected to the first blade segment 20 to be extended, and another portion of the fiber cloth is bonded to the second blade segment to be extended. In this way, by combining this blade extension connection structure with the above-mentioned blade extension connection process, a stable and reliable connection between the first blade segment 20 to be extended and the second blade segment to be extended can be achieved through the connecting beam 10, and the extended blade can meet requirements in terms of structural strength.

[0034] The frame 11 of this embodiment includes a main frame and a support frame. The main frame adopts a rectangular structure, but of course other shapes can also be adopted. The main frame has a cavity, and the support frame is detachably arranged in the cavity. The support frame can adopt various shapes such as a cross shape and a M shape, as long as it can complement the space of the main frame, so that the main frame and the support frame jointly support the sealing airbag 12, ensuring reliable support for the sealing airbag 12, and further ensuring the reliability of the fitting and curing connection between the fiber cloth and the inner wall of the first blade segment 20 to be extended.

[0035] This embodiment also provides a wind turbine, including the above-mentioned blade extension connection structure. The blade extension connection structure forms complete blades that meet the use requirements, ensuring the normal assembly and use of the wind turbine.

[0036] It should be noted that, in the above embodiments, a plurality refers to at least two.

[0037] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0038] 1. Solve the problem of low adaptability of blades to the actual environment in the existing technology;

[0039] 2. A reliable and stable connection is achieved between the first blade segment to be extended and the second blade segment to be extended, thereby achieving the extendable effect of the blade;

[0040] 3. Different connection methods are used between the connecting beam and the first blade segment to be extended and the second blade segment to be extended, so that the connecting beam can be connected to different blade segments in a coordinated manner, thereby ensuring the connection effect;

[0041] 4. A reinforced connection is adopted on the outer surface of the connection between the first blade segment to be extended and the second blade segment to be extended, thereby improving the connection strength between the first blade segment to be extended and the second blade segment to be extended.

[0042] Obviously, the embodiments described above are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0043] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, tasks, devices, components and / or combinations thereof.

[0044] It should be noted that the terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0045] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A blade extension connection process, characterized in that: include: A portion of the connecting beam (10) is passed through the first blade segment (20) to be extended, and the connecting beam (10) is connected to two opposite side walls in the first blade segment (20) to be extended; The portion of the connecting beam (10) exposed outside the first blade segment (20) to be extended is passed through the second blade segment to be extended and connected to the second blade segment to be extended; The connecting beam (10) comprises a frame (11) and a sealing airbag (12), and the blade extension connection process further comprises: Before connecting the connecting beam (10) to the two opposite side walls of the first blade segment (20) to be extended, a fiber cloth impregnated with resin is attached to the outer side of the sealing airbag (12); When the connecting beam (10) is inserted into the first blade segment (20) to be extended, the fiber cloth is attached to the inner wall of the first blade segment (20) to be extended, and hot air is introduced into the sealing airbag (12) to heat and solidify the fiber cloth, so that the solidified fiber cloth is connected to the first blade segment (20) to be extended.

2. The blade extension connection process according to claim 1, characterized in that: The frame (11) comprises a main frame body and a support frame, wherein the support frame is detachably arranged in the main frame body, and the blade extension connection process further comprises: After the fiber cloth is cured and connected, the support frame and the sealing airbag (12) are removed from the main frame body, and the cured fiber cloth remains connected to the first blade segment (20) to be extended.

3. The blade extension connection process according to claim 1, characterized in that: The blade extension connection process further comprises: When connecting the connecting beam (10) and the second blade segment to be extended, structural adhesive is applied to opposite sides of the fiber cloth, the outer side of the second blade segment to be extended is heated to solidify the structural adhesive, and the fiber cloth is bonded to the inner wall of the second blade segment to be extended through the structural adhesive.

4. The blade extension connection process according to claim 1, characterized in that: The blade extension connection process further comprises: After the connecting beam (10) is connected to the second blade segment to be extended, a fiber cloth impregnated with resin is attached to the outer side of the connection between the first blade segment to be extended (20) and the second blade segment to be extended, and the fiber cloth is heated and cured.

5. The blade extension connection process according to claim 1, characterized in that: The blade extension connection process further comprises: After the connecting beam (10) is connected to the second blade segment to be extended, structural adhesive is coated on the outer side of the connection between the first blade segment to be extended (20) and the second blade segment to be extended, and the structural adhesive is heated and cured.

6. The blade extension connection process according to claim 1, characterized in that: The blade extension connection process further comprises: Before the connecting beam (10) is inserted into the first blade segment (20) to be extended, the first blade is cut off, and the root segment of the cut-off first blade is used as the first blade segment (20) to be extended; the second blade is switched, and the tip segment of the cut-off second blade is used as the second blade segment to be extended.

7. A blade extension connection structure, characterized in that: Used to perform the blade extension connection process according to any one of claims 1 to 6, the blade extension connection structure comprises: a first leaf segment to be extended (20); a second leaf segment to be extended; A connecting beam (10), the connecting beam (10) comprising a frame (11) and a sealing airbag (12), the sealing airbag (12) being detachably covered on the outside of the frame (11), the outer surface of the sealing airbag (12) being capable of being attached with a fiber cloth impregnated with resin, a portion of the fiber cloth being cured and connected to the first blade segment to be extended (20), and another portion of the fiber cloth being bonded to the second blade segment to be extended.

8. The blade extension connection structure according to claim 7, characterized in that: The frame (11) comprises a main frame and a support frame, the main frame has a cavity, the support frame is detachably arranged in the cavity, and the main frame and the support frame jointly support the sealing airbag (12).

9. A wind turbine, characterized in that: It includes the blade extension connection structure according to claim 7 or 8.

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