A segmented main beam blade

Abstract

The present invention discloses a segmented main beam blade, which is applied to a wind turbine generator set and includes: a housing, a main beam disposed inside the housing, and a web disposed inside the housing. The main beam includes: a plurality of segmented main beams sequentially arranged along the span direction of the housing. In this solution, by adopting a segmented structure for the main beam, it is convenient for each segmented main beam to be at the best position of the corresponding blade structure efficiency, thereby helping to reduce the influence brought by the drastic change of the blade geometric shape, not only improving the blade structure efficiency, but also reducing the blade weight.

Description

Technical Field

[0001] The present invention relates to the technical field of wind turbine units, and particularly relates to a segmented main beam blade. Background Art

[0002] With the enlargement of wind turbine units, the wind power blades are getting longer and longer. In order to reduce the risk of blade tip hitting the tower, the pre-bending amount of the blade increases. At the same time, in order to reduce the blade load, blade sweep is gradually applied to the blade. As the main load-bearing component of the blade, the main beam plays a crucial role. Except for segmented blades, existing blades all adopt continuous main beams. Due to the three-dimensional geometric shape characteristics of large wind power blades, such as pre-bending, sweep, and pre-twist, when using a continuous main beam on the pressure side or suction side of the blade, it is very difficult for the continuous main beam to be at the position with the highest structural efficiency of the blade in all spanwise ranges, that is, at the maximum thickness of each cross-section. In addition, due to the limited internal space of the blade, too large pre-bending and sweep will lead to the cutting of the main beam in the blade tip area or even unable to be laid. At the same time, it is also very difficult for the web to be in a plane, resulting in difficulties in design and processing.

[0003] That is to say, the existing blades still have the following defects:

[0004] 1. The main beams of existing blades mainly adopt continuous main beams, which are laid from the blade root to the blade tip. Limited by the three-dimensional geometric shape of the blade, it is difficult to ensure that the position of the continuous main beam in each cross-section is at the best structural efficiency of each cross-section, and it needs to be cut or cannot be laid at the blade tip, resulting in difficulties in design and processing.

[0005] 2. The continuous main beam has a large span from the blade root to the blade tip, the required mold is long, and it occupies a large space, and the production efficiency is lower than that of the segmented main beam. Summary of the Invention

[0006] In view of this, the present invention provides a segmented main beam blade. By adopting a segmented structure for the main beam, it is convenient for each segmented main beam to be at the position with the best structural efficiency of the corresponding blade, thereby helping to reduce the influence brought by the drastic change of the blade geometric shape, not only improving the blade structural efficiency, but also reducing the blade weight.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A segmented main beam blade applied to a wind turbine unit, comprising: a housing, a main beam disposed inside the housing, and a web disposed inside the housing, wherein the main beam comprises:

[0009] A plurality of segmented main beams arranged in sequence along the span of the housing.

[0010] Preferably, the web comprises:

[0011] A plurality of segmented webs arranged in the spanwise direction of the housing in sequence; the plurality of segmented webs and the plurality of segmented main beams are distributed in one-to-one correspondence.

[0012] Preferably, the housing includes a pressure surface housing and a suction surface housing that are joined in an opposing manner;

[0013] The two main beams are respectively disposed inside the pressure surface housing and the suction surface housing, and the plurality of segmented main beams located in the pressure surface housing and the plurality of segmented main beams located in the suction surface housing are distributed in one-to-one correspondence to form multiple pairs of paired segmented main beams;

[0014] The plurality of segmented webs are all connected between the inner walls of the pressure surface housing and the suction surface housing, and are distributed in sequence along the spanwise direction of the pressure surface housing or the suction surface housing. The plurality of segmented webs and the multiple pairs of paired segmented main beams are distributed in one-to-one correspondence.

[0015] Preferably, the centerlines of each pair of paired segmented main beams are located in the same plane.

[0016] Preferably, no two adjacent segmented main beams among the plurality of segmented main beams are collinearly distributed.

[0017] Preferably, the spanwise distance of the near blade tip of the segmented main beam closer to the blade root is greater than the spanwise distance of the near blade root end of the segmented main beam closer to the blade tip for each adjacent two segmented main beams.

[0018] Preferably, chamfers are provided at the near blade root end and the near blade tip of each segmented main beam.

[0019] Preferably, the chamfer is a triangular chamfer, and the height-to-length ratio of the triangular chamfer is between 1:5 and 1:20.

[0020] Preferably, the segmented main beam is manufactured by a segmented mold or by sheet forming.

[0021] Preferably, the segmented main beam includes a pultruded sheet; the pultruded sheet includes a pultruded glass fiber sheet, a pultruded carbon fiber sheet, or a pultruded carbon glass hybrid sheet.

[0022] It can be seen from the above technical solutions that for the segmented main beam blade provided by the present invention, by adopting a segmented structure for the main beam, it is convenient to enable each segmented main beam to be at the best position of the corresponding blade structure efficiency, thereby helping to reduce the influence caused by the drastic change in the blade geometric shape, not only improving the blade structure efficiency, but also reducing the blade weight. Description of the Drawings

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0024] Figure 1 It is a schematic structural diagram of the segmented main beam blade provided by the embodiment of the present invention.

[0025] Among them, 10 is the segmented main beam, 20 is the segmented web, 30 is the pressure surface shell, 40 is the suction surface shell, and 50 is the paired segmented main beam. Detailed implementation manners

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0027] The segmented main beam blade provided by the embodiment of the present invention is applied to a wind turbine generator set and includes: a shell, a main beam built in the shell, and a web arranged in the shell. As Figure 1 shown, the main beam includes:

[0028] A plurality of segmented main beams 10 arranged in sequence along the span direction of the shell.

[0029] It should be noted that in this solution, when a plurality of segmented main beams 10 are arranged in sequence along the span direction of the shell, they can have different angles, chordwise positions, and dimensional parameters to facilitate adapting to the shape change of the blade, that is, to facilitate the segmented main beam 10 to be arranged at the position with the highest structural efficiency of the blade. Of course, the position of each segmented main beam is determined according to the geometric characteristics of the three-dimensional shape of the blade. In addition, the web in this solution can also be manufactured in segments, and details can be seen in the following description. That is to say, the main beam in this solution adopts a segmented structure so that each segmented main beam can be at the corresponding best structural efficiency position of the blade, which helps to reduce the influence caused by the drastic change in the geometric shape of the blade, not only improving the structural efficiency of the blade but also reducing the weight of the blade. Of course, the main beam in this solution adopts a segmented structure, without tip trimming, which is convenient for laying.

[0030] In this solution, in order to avoid the direct alignment of the web with the core material of the shell and prone to structural failure, correspondingly, the web includes:

[0031] A plurality of segmented webs 20 arranged in sequence along the span direction of the shell, and its structure can be referred toFigure 1 As shown; a plurality of segmented webs 20 and a plurality of segmented main beams 10 are distributed in one-to-one correspondence.

[0032] It should be noted that the webs in this solution are manufactured in segments. The length of the segmented web 20 is determined according to the length of the corresponding segmented main beam 10, and the thickness of the segmented web 20 is determined according to the structural reliability. In addition, the segmented main beam 10 and the segmented web 20 in this solution can be manufactured using segmented molds, which can effectively save floor space and improve production efficiency. Of course, this solution can also reuse retired blades. By cutting the main beam or root of the retired blade into plates of different sizes and then using them as the main beam of the blade to manufacture new blades.

[0033] Specifically, as Figure 1 shown, the housing includes a pressure surface housing 30 and a suction surface housing 40 that are joined together; wherein, the pressure surface housing 30 and the suction surface housing 40 are adhesively joined;

[0034] Two main beams are respectively disposed inside the pressure surface housing 30 and the suction surface housing 40, and the plurality of segmented main beams 10 located in the pressure surface housing 30 and the plurality of segmented main beams 10 located in the suction surface housing 40 are distributed in one-to-one correspondence to form multiple pairs of paired segmented main beams 50;

[0035] A plurality of segmented webs 20 are all connected between the inner walls of the pressure surface housing 30 and the suction surface housing 40 and are sequentially distributed along the span of the pressure surface housing 30 or the suction surface housing 40. The plurality of segmented webs 20 and the multiple pairs of paired segmented main beams 50 are distributed in one-to-one correspondence. That is to say, the housing in this solution is a split housing; the main beam is a segmented main beam, and the segmented main beam is a paired segmented main beam and is respectively disposed inside the split housing; the web is a segmented web, and each segmented web is connected to the inner wall of the split housing and is distributed in correspondence with the paired segmented main beam.

[0036] In addition, it should also be noted that the manufacturing steps of the segmented main beam blade in this solution are as follows:

[0037] 1. Arrange each segmented main beam in the laminate of the corresponding housing through the positioning line, and then vacuum infusion mold with the housing laminate to form the pressure surface housing or the suction surface housing;

[0038] 2. First, fix and install each segmented web on the inner wall of the suction surface housing using structural adhesive, then apply structural adhesive on the side close to the pressure surface housing, and finally perform mold closing and fixing of the blade.

[0039] Furthermore, when arranging each pair of paired segmented main beams 50 in the pressure surface housing 30 and the suction surface housing 40, it should be ensured that the widths and lengths of the paired segmented main beams 50 are the same, and the center lines of each pair of paired segmented main beams 50 are in the same plane, so that the segmented web 20 maintains a planar shape.

[0040] Furthermore, in order to better place each segmented main beam 10 at the position with the best blade structure efficiency, as Figure 1 shown, every two adjacent segmented main beams 10 among the multiple segmented main beams 10 are not collinearly distributed. Among them, as Figure 1 shown, every two adjacent segmented main beams 10 are parallel and non-collinear, that is, every two adjacent segmented main beams 10 are parallel and staggered. Of course, every two adjacent segmented main beams 10 can also be non-collinear at a certain angle (included angle).

[0041] In order to further optimize the above technical solution, as Figure 1 shown, for every two adjacent segmented main beams 10, the spanwise distance from the near blade tip of the segmented main beam 10 closer to the blade root is greater than the spanwise distance from the near blade root of the segmented main beam 10 closer to the blade tip. Among them, the spanwise distance from the near blade tip of the segmented main beam 10 is the distance from the blade root (housing port) to the near blade tip of the segmented main beam 10, and the spanwise distance from the near blade root of the segmented main beam 10 is the distance from the blade root (housing port) to the near blade root of the segmented main beam 10. This solution is designed in this way to make it possible for two adjacent segmented main beams 10 to have a certain length of overlap in the spanwise position, avoid stress concentration, and at the same time, in order to better transmit the load, and this length is greater than or equal to 20 times the thickness of the segmented main beam 10 (plate).

[0042] In this solution, in order to avoid stress concentration at the near blade root and near blade tip of each segmented main beam 10, chamfers with a certain slope are provided at both the near blade root and near blade tip of each segmented main beam 10.

[0043] Specifically, the chamfer is a triangular chamfer, and the height-to-length ratio (the ratio of height to length) of the triangular chamfer is between 1:5 and 1:20.

[0044] Furthermore, the segmented main beam 10 is manufactured by using segmented molds or sheet forming. Among them, manufacturing the segmented main beam 10 by using segmented molds can effectively save floor space and improve production efficiency at the same time.

[0045] Furthermore, the segmented main beam 10 can be manufactured by pultrusion of sheets, which has the characteristics of simple manufacturing method and low production cost. Among them, the segmented main beam 10 includes pultruded sheets; preferably, the pultruded sheets include pultruded glass fiber sheets, pultruded carbon fiber sheets or pultruded carbon glass hybrid sheets.

[0046] The embodiment of the present invention also provides a wind turbine, including a wind turbine blade, and the wind turbine blade is the segmented main beam blade as described above. Since this solution adopts the above-mentioned segmented main beam blade, it accordingly has corresponding beneficial effects, which can be specifically referred to the previous description and will not be elaborated here.

[0047] In the present specification, the various embodiments are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. For the same or similar parts among the various embodiments, reference may be made to each other.

[0048] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A segmented main beam blade, applied to a wind turbine, comprising: A housing, a main beam disposed inside the housing, and a web disposed inside the housing, wherein the main beam includes: A plurality of segmented main beams (10) arranged in sequence along the span direction of the housing; Among the plurality of segmented main beams (10), every two adjacent segmented main beams (10) are not collinearly distributed; For every two adjacent segmented main beams (10), the spanwise distance of the segmented main beam (10) near the blade root at its near blade tip is greater than the spanwise distance of the segmented main beam (10) near the blade tip at its near blade root.

2. The segmented main beam blade according to claim 1, wherein The web includes: A plurality of segmented webs (20) arranged in sequence along the span direction of the housing; the plurality of segmented webs (20) and the plurality of segmented main beams (10) are distributed in one-to-one correspondence.

3. The segmented main beam blade according to claim 2, characterized in that, The housing includes a pressure surface housing (30) and a suction surface housing (40) that are joined and connected; The two main beams are respectively disposed inside the pressure surface housing (30) and the suction surface housing (40), and the plurality of segmented main beams (10) located in the pressure surface housing (30) and the plurality of segmented main beams (10) located in the suction surface housing (40) are distributed in one-to-one correspondence to form a plurality of pairs of paired segmented main beams (50); The plurality of segmented webs (20) are all connected between the inner walls of the pressure surface housing (30) and the suction surface housing (40), and are sequentially distributed along the span direction of the pressure surface housing (30) or the suction surface housing (40), and the plurality of segmented webs (20) and the plurality of pairs of paired segmented main beams (50) are distributed in one-to-one correspondence.

4. The segmented main beam blade according to claim 3, wherein, The centerlines of each pair of paired segmented main beams (50) are located in the same plane.

5. The segmented main beam blade according to claim 1, wherein, Chamfers are provided at both the near blade root end and the near blade tip of each segmented main beam (10).

6. The segmented main beam blade according to claim 5, characterized in that, The chamfer is a triangular chamfer, and the height-to-length ratio of the triangular chamfer is between 1:5 and 1:

20.

7. The segmented main beam blade according to claim 1, wherein, The segmented main beam (10) is manufactured by a segmented mold or by sheet forming.

8. The segmented main beam blade according to claim 1, wherein, The segmented main beam (10) includes pultruded sheets; the pultruded sheets include pultruded fiberglass sheets, pultruded carbon fiber sheets, or pultruded carbon-fiber / glass-fiber hybrid sheets.

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