Wind driven generator, fan blade and fan blade web

Abstract

The utility model relates to the technical field of wind driven generators, and discloses a wind driven generator, a fan blade and a fan blade web, the fan blade web comprises two installation turnups located on the upper edge and the lower edge of the web and a web skin arranged between the two installation turnups, the web skin is provided with a C-shaped opening at the web blade root, the C-shaped opening extends outwards to be provided with a vertical edge, and the vertical edge is connected with the installation turnups. The vertical edge vertically protrudes out of the web skin, and the height H from the outer edge of the vertical edge to the vertical edge of the web skin is smaller than or equal to the height H0 from the outer edge of the mounting flange on the same side to the web bonding angle of the web skin, so that the structural strength of the web blade root can be enhanced through the vertical edge at the C-shaped opening, and the web is prevented from losing efficacy in a strength weak area.

Description

Technical Field

[0001] The utility model relates to the technical field of wind turbine generators, and more specifically, to a fan blade web. In addition, the utility model also provides a fan blade comprising the fan blade web and a wind turbine generator comprising the fan blade. Background Art

[0002] In order to improve power generation efficiency and reduce costs, the size of wind turbine blades has continued to increase. Currently, wind turbines mainly use a long and flexible blade design.

[0003] In order to ensure the structural strength and stability of the blade, a three-web structure design is usually adopted, that is, two main webs are provided between the suction side main beam and the pressure side main beam, and a small web is provided between the suction side auxiliary beam and the pressure side auxiliary beam; if the number of main webs is reduced to one, the strength of the connecting webs between the main beams will be reduced, the bearing capacity will be weakened, and structural strength failure will easily occur in the weak area of ​​the main web.

[0004] In summary, how to ensure the connection strength of the blades while reducing the number of blade webs is an urgent problem to be solved by those skilled in the art. Utility Model Content

[0005] In view of this, the purpose of the utility model is to provide a fan blade web, which enhances the structural strength of the web blade root through the vertical edge at the C-shaped opening to avoid failure of the web in the weak strength area.

[0006] In addition, the utility model also provides a fan blade including the above-mentioned fan blade web and a wind turbine generator including the above-mentioned fan blade.

[0007] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0008] A fan blade web, comprising two mounting flanges located at the upper and lower edges of the web and a web skin arranged between the two mounting flanges, wherein the web skin is provided with a C-shaped opening at the web blade root, and the C-shaped opening is extended outwardly to be provided with a vertical edge, the vertical edge is vertically protruding from the web skin, and the height H of the vertical edge from the outer edge of the vertical edge to the web skin is less than or equal to the height H0 of the web bonding angle from the outer edge of the mounting flange on the same side to the web skin.

[0009] Preferably, both ends of the C-shaped opening are provided with a beveled surface, one end of the beveled surface is connected to the C-shaped opening, and the other end of the beveled surface is connected to the end surface of the web skin, and the bevel angle α of the beveled surface is greater than the angle between the extension lines of the two ends of the C-shaped opening and the installation flange.

[0010] Preferably, the lengths of the beveled surfaces at both ends of the C-shaped opening are the same, and the bevel angles α of the beveled surfaces at both ends of the C-shaped opening are the same.

[0011] Preferably, the length L of the beveled surface in the extending direction of the web is 5 times the height H of the vertical edge, and the height H of the vertical edge is the same as the height H0 of the bonding angle of the web.

[0012] Preferably, mounting flanges are provided on both sides of the web skin, so that the mounting flanges and the web skin form a T-shaped structure.

[0013] Preferably, the mounting flange includes a main flange and an auxiliary flange. The main flange and the auxiliary flange are respectively arranged on both sides of the web skin, and the length of the main flange is greater than the length of the auxiliary flange.

[0014] Preferably, the main flange, the auxiliary flange and the web skin are of an integral structure.

[0015] Preferably, the main flange and the web skin are of an integral structure, and the auxiliary flange is connected to the web skin through structural adhesive.

[0016] A wind turbine blade includes a blade body. A main web is provided between the main beam on the suction side and the main beam on the pressure side of the blade body, and an auxiliary web is provided between the auxiliary beam on the suction side and the auxiliary beam on the pressure side of the blade body. Both the main web and the auxiliary web are the wind turbine blade webs described in any one of the above.

[0017] A wind turbine includes a plurality of the wind turbine blades.

[0018] The wind turbine blade web provided by the present utility model is provided with a vertical edge extending outward at the C-shaped opening of the web root. The vertical edge can enhance the structural strength of the web at the root, avoid the structural strength failure of the web at the root of the weak strength area, and thus can reduce the number of wind turbine blades while ensuring the connection strength and load-bearing capacity of the blades.

[0019] In addition, the present utility model also provides a wind turbine blade including the above-mentioned wind turbine blade web and a wind turbine including the above-mentioned wind turbine blade. Description of the Drawings

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model 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 the embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts.

[0021] Figure 1Structural schematic diagram of a specific embodiment of the wind turbine blade web provided by the present utility model;

[0022] Figure 2 is Figure 1 Partial schematic diagram at the web root;

[0023] Figure 3 is Figure 2 front view schematic diagram of

[0024] Figure 4 Partial schematic diagram of the inclined section;

[0025] Figure 5 is Figure 2 side view schematic diagram of

[0026] Figure 6 Structural schematic diagram of the front of the wind turbine blade provided by the present utility model;

[0027] Figure 7 is the structural schematic diagram of the back of the wind turbine blade.

[0028] Figures 1-7 In

[0029] 10 - blade; 20 - main web; 30 - auxiliary web; 1 - mounting flange; 11 - main flange; 12 - auxiliary flange; 2 - web skin; 3 - C-shaped opening; 4 - vertical edge; 5 - inclined section. Specific embodiments

[0030] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0031] The core of the present utility model is to provide a wind turbine blade web, which enhances the structural strength at the web root through the vertical edge at the C-shaped opening, avoiding the failure of the web in the weak strength area.

[0032] In addition, the present utility model also provides a wind turbine blade including the above-mentioned wind turbine blade web and a wind turbine including the above-mentioned wind turbine blade.

[0033] The utility model provides a fan blade web, comprising two mounting flanges 1 located at the upper and lower edges of the web and a web skin 2 arranged between the two mounting flanges 1, the web skin 2 is provided with a C-shaped opening 3 at the web blade root, the C-shaped opening 3 is extended outwardly to be provided with a vertical edge 4, the vertical edge 4 is vertically protruded from the web skin 2, and the vertical edge height H from the outer edge of the vertical edge 4 to the web skin 2 is less than or equal to the web bonding angle height H0 from the outer edge of the mounting flange 1 on the same side to the web skin 2.

[0034] The root of the web of the fan blade is a weak area in structural strength. In order to reduce the stress concentration problem at the root of the web, a C-shaped opening 3 is usually provided at the root of the web. By increasing the area of ​​the web end and reducing the stress concentration phenomenon, the shape and size of the C-shaped opening 3 can be determined according to the design size of the web in actual production with reference to the C-shaped opening 3 in the prior art.

[0035] To further enhance the structural strength of the web blade root, please refer to Figure 2 The C-shaped opening 3 is provided with a vertical edge 4 extending outward, and the vertical edge 4 is vertically protruded from the C-shaped opening 3. The vertical edge 4 can be bonded to the C-shaped opening 3 by structural adhesive, and can also be set as an integral structure with the C-shaped opening 3.

[0036] On the one hand, the vertical edge 4 can serve as a reinforcing rib structure to enhance the structural strength of the fan blade web at the web root, so as to enhance the connection strength between the web and the fan blade; on the other hand, the setting of the vertical edge 4 can further increase the area of ​​the web end, further reducing the stress concentration problem at the web root.

[0037] Taking processing and assembly issues into consideration, the edge height H from the outer edge of the edge 4 to the web skin 2 must be less than or equal to the web bonding angle height H0 from the outer edge of the mounting flange 1 on the same side to the web skin 2. Usually, the edge height H is set equal to the web bonding angle height H0.

[0038] In this embodiment, an outwardly extending vertical edge 4 is provided at the C-shaped opening 3 of the web blade root. The vertical edge 4 can enhance the structural strength of the web at the blade root, avoid structural strength failure of the web at the blade root in the strength weak area, and increase the end area of ​​the web to reduce the stress concentration problem, thereby reducing the number of wind turbine blades while ensuring the connection strength and bearing capacity of the blade 10.

[0039] On the basis of the above embodiment, both ends of the C-shaped opening 3 can be provided with a chamfer 5, the chamfer 5, one end of the chamfer 5 is connected to the C-shaped opening 3, and the other end of the chamfer 5 is connected to the end face of the web skin 2, and the chamfer angle α of the chamfer 5 is greater than the angle between the extension lines of the two ends of the C-shaped opening 3 and the installation flange 1.

[0040] Please refer to Figure 3, the chamfer angle α of the chamfered surface 5 is greater than the angle between the extension line of the C-shaped opening 3 and the mounting flange 1. Therefore, the setting of the chamfered surface 5 is beneficial to shortening the length of the C-shaped opening 3, thereby enhancing the connection stability between the web skin 2 and the upper and lower mounting flanges 1, and avoiding obvious stress concentration problems at the position of the web starting point A.

[0041] The chamfer angle α of the chamfered surface 5, and the height L of the chamfered surface 5 in the web extension direction, that is, the height L from the chamfered surface 5 to the web starting point A, are determined by experiments or numerical simulation according to the design dimensions of the fan blade web in actual production to ensure the strength and stability at the web starting point A.

[0042] Usually, when strength problems such as stress concentration and fiber - to - fiber failure occur at the web starting point A, the chamfer angle α of the chamfered surface 5 and the height L of the chamfered surface 5 can be appropriately reduced as appropriate; conversely, when the web skin 2 between the chamfered surface 5 and the mounting flange 1 has insufficient stability problems, the chamfer angle α of the chamfered surface 5 and the height L of the chamfered surface 5 can be appropriately increased as appropriate.

[0043] In this embodiment, the setting of the chamfered surface 5 shortens the length of the C-shaped opening 3, which is beneficial to reducing the stress concentration problem at the web starting point A and is beneficial to ensuring the stability of the web skin 2 between the C-shaped opening 3 and the mounting flange 1.

[0044] The chamfer angles α and other dimensions of the chamfered surfaces 5 at the upper and lower ends of the C-shaped opening 3 can be the same or different; for the convenience of processing the chamfered surface 5, usually, the lengths of the chamfered surfaces 5 at both ends of the C-shaped opening 3 are set to be the same, and the chamfer angles α of the chamfered surfaces 5 at both ends of the C-shaped opening 3 are also the same.

[0045] In a specific embodiment, the height L of the chamfered surface 5 in the web extension direction is 5 times the height H of the vertical edge, and the height H of the vertical edge is the same as the height H0 of the web bonding angle. Compared with the existing web structure design, the strain of the fan blade web at the blade root is reduced, and the stability coefficient and the fiber - to - fiber failure safety factor are increased.

[0046] In the prior art, the mounting flanges 1 at the upper and lower edges of the fan blade web only protrude from one side of the web skin 2 to form an L-shaped structure for bonding with the blade 10; in order to enhance the connection strength and connection stability between the web and the blade 10, preferably, mounting flanges 1 can be provided on both sides of the web skin 2 so that the mounting flanges 1 and the web skin 2 form a T-shaped structure.

[0047] Usually, the materials of the mounting flanges 1 on both sides of the web skin 2 are the same for the convenience of web processing and manufacturing; usually, the heights of the mounting flanges 1 on both sides of the web skin 2 are the same, while the lengths by which the mounting flanges 1 protrude from the web skin 2 can be the same or different.

[0048] Please refer toFigure 5 The installation flange 1 includes a main flange 11 and an auxiliary flange 12. The main flange 11 is the installation flange 1 existing in the L-shaped web of the prior art, and the auxiliary flange 12 is the newly added installation flange 1. The main flange 11 and the auxiliary flange 12 are respectively arranged on both sides of the web skin 2, and the length of the main flange 11 is greater than that of the auxiliary flange 12.

[0049] On the premise that the size of the fan blade web remains unchanged, the size of the main flange 11 is usually the same as that of the installation flange 1 of the existing L-shaped web, while the auxiliary flange 12 can be determined according to the design connection strength requirements needed in actual production to ensure the stable installation of the web and the blade 10.

[0050] In this embodiment, installation flanges 1 are arranged on both sides of the web skin 2 to form a T-shaped structure. Compared with the existing L-shaped structure, the T-shaped structure has a larger connection area with the blade 10, which is beneficial to enhancing the connection strength between the web and the blade 10 and can enhance the connection stability and reliability of the web.

[0051] Regarding the processing of the T-shaped web, it is preferably set that the main flange 11, the auxiliary flange 12 and the web skin 2 are all of an integral structure. The fan blade web is formed by integral extrusion or integral perfusion, and the connection strength between the main flange 11 and the web skin 2, as well as between the auxiliary flange 12 and the web skin 2, is enhanced by the integral forming method.

[0052] In the case where the size of the fan blade web is large and it is difficult to ensure the yield rate of integral forming, it can also be set that the main flange 11 and the web skin 2 are of an integral structure, and the auxiliary flange 12 is connected to the web skin 2 through structural adhesive.

[0053] At this time, first the main flange 11 and the web skin 2 are formed by integral extrusion or integral perfusion, and then the auxiliary flange 12 is bonded to the other side of the web skin 2 relatively far from the main flange 11 through structural adhesive, and the end face of the auxiliary flange 12 is flush with that of the main flange 11 to ensure that the installation flanges 1 on both sides of the web skin 2 can effectively contact and connect with the blade 10.

[0054] In addition to the above-mentioned fan blade web, the present utility model also provides a fan blade including the fan blade web disclosed in the above embodiment. The fan blade includes a blade body. A main web 20 is provided between the suction surface main beam and the pressure surface main beam of the blade body, and an auxiliary web 30 is provided between the suction surface auxiliary beam and the pressure surface auxiliary beam of the blade body. Both the main web 20 and the auxiliary web 30 are the fan blade webs disclosed in the above embodiment.

[0055] Please refer to Figure 7, the structure and dimensions of the main web 20, the structure and dimensions of the auxiliary web 30, and the installation positions of the main web 20 and the auxiliary web 30 can be determined according to the dimensions of the blade 10 in actual production, the designed web connection strength, and the designed load capacity, which will not be elaborated here.

[0056] In this embodiment, the wind turbine blade adopts a double-web structure, and the C-shaped vertical edge design of the web is used to enhance the structural strength at the blade root of the web, which not only reduces the number of webs and the manufacturing cost of the wind turbine blade, but also can ensure the overall structural strength of the blade 10 and guarantee the safety margin of the blade 10.

[0057] In addition, the present invention also provides a wind turbine including the wind turbine blade disclosed in the above embodiment. A plurality of blades 10 are evenly arranged in the circumferential direction, and the blades 10 are all the wind turbine blades disclosed in the above embodiment. For other parts of this wind turbine, please refer to the prior art and will not be elaborated here.

[0058] In this specification, each embodiment is described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. The same or similar parts among the embodiments can be referred to each other.

[0059] The above has introduced in detail the wind turbine, the wind turbine blade, and the wind turbine blade web provided by the present invention. Specific examples are used in this article to elaborate the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A fan blade web, comprising two mounting flanges (1) located at the upper and lower edges of the web and a web skin (2) arranged between the two mounting flanges (1), wherein the web skin (2) is provided with a C-shaped opening (3) at the web blade root, characterized in that: The C-shaped opening (3) is provided with a vertical edge (4) extending outward, and the vertical edge (4) is arranged to protrude vertically from the web skin (2), and the vertical edge height H from the outer edge of the vertical edge (4) to the web skin (2) is less than or equal to the web bonding angle height H0 from the outer edge of the installation flange (1) on the same side to the web skin (2).

2. The fan blade web according to claim 1, characterized in that: Both ends of the C-shaped opening (3) are provided with a chamfered surface (5), one end of the chamfered surface (5) is connected to the C-shaped opening (3), and the other end of the chamfered surface (5) is connected to the end surface of the web skin (2), and the chamfering angle α of the chamfered surface (5) is greater than the included angle between the extension lines of the two ends of the C-shaped opening (3) and the installation flange (1).

3. The fan blade web according to claim 2, characterized in that: The lengths of the chamfered surfaces (5) at both ends of the C-shaped opening (3) are the same, and the chamfered angles α of the chamfered surfaces (5) at both ends of the C-shaped opening (3) are the same.

4. The fan blade web according to claim 3, characterized in that: The length L of the chamfered surface (5) in the web extension direction is 5 times the height H of the vertical edge, and the height H of the vertical edge is the same as the height H0 of the web bonding angle.

5. The fan blade web according to any one of claims 1 to 4, characterized in that: The mounting flanges (1) are provided on both sides of the web skin (2), so that the mounting flanges (1) and the web skin (2) form a T-shaped structure.

6. The fan blade web according to claim 5, characterized in that: The installation flange (1) comprises a main flange (11) and an auxiliary flange (12), wherein the main flange (11) and the auxiliary flange (12) are respectively arranged on two sides of the web skin (2), and the length of the main flange (11) is greater than the length of the auxiliary flange (12).

7. The fan blade web according to claim 6, characterized in that: The main flange (11), the auxiliary flange (12) and the web skin (2) are an integrated structure.

8. The fan blade web according to claim 6, characterized in that: The main flange (11) and the web skin (2) are an integral structure, and the auxiliary flange (12) is connected to the web skin (2) via structural adhesive.

9. A fan blade, characterized in that: The invention comprises a blade body, wherein the blade body is provided with a main web (20) between a suction surface main beam and a pressure surface main beam, and the blade body is provided with an auxiliary web (30) between a suction surface auxiliary beam and a pressure surface auxiliary beam, wherein the main web (20) and the auxiliary web (30) are both the webs of the wind turbine blade according to any one of claims 1 to 8.

10. A wind turbine generator, characterized in that: The invention comprises several wind turbine blades as claimed in claim 9.

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