Telescopic wind turbine blade

Abstract

The invention relates to a telescopic wind turbine blade which comprises a blade unfolding structure, a connecting rod mechanism, a paper folding structure, a blade base and a wing-shaped bottom plate. The connecting rod mechanism is of a three-dimensional geometric topological structure formed by intersecting first connecting rods in pairs, and stretching movement in the specific direction is achieved. The paper folding structure is a regular polygon three-dimensional geometric topological structure formed by second connecting rods through a multi-rod connecting structure, and stretching movement in the specific direction is achieved. The connecting rod mechanism is respectively connected with the blade base and the wing-shaped bottom plate; and the wing-shaped bottom plate is connected with the blade expansion structure. Compared with the prior art, a paper folding structure and a connecting rod mechanism are applied to the blade root part of the wind turbine blade, so that the blade shrinks the spanwise size and reduces the wind load in extreme wind speed environments such as typhoon and the like, and therefore, the blade is not easy to damage, and is easier to transport and recover.

Description

Technical Field

[0001] The invention relates to the technical field of wind power generation, and in particular to a retractable wind turbine blade. Background Art

[0002] Since the 21st century, human demand for energy has been increasing, but traditional energy reserves are limited and non-renewable, which makes the development and utilization of new energy a necessity. As a renewable energy technology, wind power generation has wind turbine blades as its key component. The large-scale wind turbine blades are an important trend in the development of wind energy technology, but they also bring a series of challenges. As the blade size increases, the contradiction between the requirements for structural performance, lightweight and aerodynamic performance becomes more prominent.

[0003] Large wind turbine blades face many challenges in design, material selection, operation and maintenance. As wind turbines grow larger, blade design needs to be lightweight while ensuring structural strength in order to improve aerodynamic efficiency and reduce costs. In terms of materials, although composite materials such as glass fiber and carbon fiber provide the required strength and stiffness, their high cost and difficulty in recycling become problems. Blades are eroded by harsh environments during operation, and effective maintenance strategies are required to extend their service life. Applying telescopic structures to wind turbine blades can effectively reduce damage to blades in extreme wind speed environments such as typhoons, and make them easier to transport and recycle. Blade root fracture under extreme wind speeds is the main form of wind turbine damage. Summary of the invention

[0004] The purpose of the present invention is to provide a retractable wind turbine blade in order to overcome the defects of the above-mentioned prior art, and to apply an origami structure and a connecting rod mechanism to the root part of the wind turbine blade, so that the blade is not easily damaged in extreme wind speed environments such as typhoons, and is easier to transport and recycle.

[0005] The present invention relates to a retractable wind turbine blade. By adjusting the blade length to adapt to different wind speeds, the wind turbine generator set can expand the swept wind area at low wind speeds, thereby increasing the power generation, and reduce the swept wind area at high wind speeds to limit the power output, thereby protecting the equipment from damage. Under high wind speed conditions, shortening the blade length can effectively reduce the aerodynamic force and bending moment borne by the blades, and reduce the load on the tower and the hub. In addition, the foldable blade length also simplifies the transportation process, especially in areas with complex terrain or restricted traffic. The design of the retractable blades can also effectively reduce the vibration and fatigue load of the blades under extreme weather conditions, thereby improving the reliability and service life of the wind turbine generator set. Optimizing the blade length not only helps to improve the wind energy conversion efficiency and reduce the cost of power generation, but also significantly increases the economic benefits, allowing the wind turbine generator set to operate more flexibly and efficiently in an environment with large wind speed changes.

[0006] The present invention provides a retractable wind turbine blade, comprising: a blade extension structure, a connecting rod mechanism, an origami structure, a blade base, and an airfoil bottom plate;

[0007] The connecting rod mechanism is a three-dimensional geometric topological structure formed by first connecting rods intersecting each other in pairs, so as to realize the stretching movement in a specific direction;

[0008] The origami structure is a regular polygonal three-dimensional geometric topological structure formed by a second connecting rod through a multi-rod connecting structure, which realizes stretching movement in a specific direction;

[0009] The connecting rod mechanism is connected to the blade base and the airfoil bottom plate respectively; the airfoil bottom plate is connected to the blade span structure.

[0010] Furthermore, the blade span structure has an airfoil structure of the blade in the span direction, which can be regarded as the remaining part of a conventional blade after the blade root part is cut off.

[0011] Furthermore, the blade base is provided with a plurality of first slide grooves, and the connecting rod mechanism is connected to the blade base via the first slide grooves. Preferably, the first slide grooves are rectangular slide grooves.

[0012] Furthermore, the wing bottom plate is provided with a plurality of second slide grooves, and the connecting rod mechanism is connected to the wing bottom plate via the second slide grooves. Preferably, the second slide grooves are rectangular slide grooves.

[0013] Furthermore, the airfoil bottom plate is welded to the blade span structure.

[0014] Furthermore, the connecting rod mechanism is welded to the blade base.

[0015] Furthermore, the connecting rod mechanism is welded to the airfoil bottom plate.

[0016] When the present invention is working, the blades can be extended and retracted through the connecting rod mechanism and the origami structure. In order to prevent the longer blades from having greater bending moments and torques when subjected to wind loads, thereby causing structural fatigue and damage, the connecting rod mechanism and the origami structure can reduce the bending moments and torques by contraction, so as to achieve the purpose of preventing the blades from being damaged. In addition, due to its good stability, the origami structure can form a good match with the intercepted wind turbine blade structure, making it less prone to damage.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] (1) A retractable wind turbine blade of the present invention is obtained by cutting off the root portion of the wind turbine blade and using an origami structure and a connecting rod mechanism as the root portion of the wind turbine blade. Since the origami structure and the connecting rod mechanism have the characteristics of retractability, the blade can increase or decrease the length of the blade by retracting, so as to cope with some sudden changes and extreme weather and prevent the blade from being damaged.

[0019] (2) The connecting rod mechanism of the present invention, when applied to wind turbine blades, has the advantages of good flexibility, large telescopic ratio, and easy control.

[0020] (3) The origami structure of the present invention has good stability and scalability. On the one hand, it can make the blade have good stability performance, and on the other hand, it can make the blade retractable and cooperate well with the connecting rod mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The present invention is a schematic diagram of the three-dimensional structure of a retractable wind turbine blade when it is retracted.

[0022] Figure 2 It is a schematic enlarged view of the three-dimensional structure of the folding structure part of a retractable wind turbine blade of the present invention when it is retracted.

[0023] Figure 3 It is a schematic diagram of the three-dimensional structure of a retractable wind turbine blade when extended according to the present invention.

[0024] Figure 4 It is a schematic enlarged view of the three-dimensional structure of a retractable wind turbine blade of the present invention when it is extended.

[0025] Figure 5 It is a three-dimensional schematic diagram of the connecting rod mechanism of the present invention when it is contracted.

[0026] Figure 6 It is a schematic enlarged stereoscopic view of the connecting rod mechanism of the present invention when it is contracted.

[0027] Figure 7 It is a three-dimensional schematic diagram of the connecting rod mechanism of the present invention when it is extended.

[0028] Figure 8 It is a schematic enlarged perspective view of the connecting rod mechanism of the present invention when it is extended.

[0029] Fig. 9 It is a three-dimensional schematic diagram of the origami structure of the present invention when it is contracted.

[0030] Fig.10 It is a schematic enlarged three-dimensional diagram of the origami structure of the present invention when it is contracted.

[0031] Fig.11It is a three-dimensional schematic diagram of the origami structure of the present invention when it is extended.

[0032] Fig.12 It is a schematic enlarged three-dimensional diagram of the origami structure of the present invention when it is contracted.

[0033] Fig.13 It is a three-dimensional schematic diagram of the blade base in the present invention.

[0034] Fig.14 It is a three-dimensional schematic diagram of the airfoil bottom plate in the present invention.

[0035] Figure numerals: 1. Blade spread structure; 2. Link mechanism; 3. Origami structure; 4. Blade base; 5. Airfoil bottom plate; 20. First connecting rod; 30. Second connecting rod; 31. Regular polygon geometric topological connection structure; 40. First slide groove; 50. Second slide groove. DETAILED DESCRIPTION

[0036] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. Component models, material names, connection structures, control methods, algorithms and other features not clearly described in this technical solution are all considered to be common technical features disclosed in the prior art.

[0037] Example 1

[0038] This embodiment provides a retractable wind turbine blade, such as Figure 1-14 As shown, it includes: a blade extension structure 1, a connecting rod mechanism 2, an origami structure 3, a blade base 4, and an airfoil bottom plate 5;

[0039] The connecting rod mechanism 2 is a three-dimensional geometric topological structure formed by the first connecting rods 20 intersecting each other in pairs, so as to realize the stretching movement in a specific direction;

[0040] The origami structure 3 is a regular polygonal three-dimensional geometric topological structure formed by the second connecting rod 30 through a multi-rod connection structure, which realizes stretching movement in a specific direction;

[0041] The connecting rod mechanism 2 is connected to the blade base 4 and the airfoil bottom plate 5 respectively; the airfoil bottom plate 5 is connected to the blade span structure 1 .

[0042] In a specific embodiment, the blade span structure 1 has an airfoil structure of the blade in the span direction, which can be regarded as the remaining part of a conventional blade after the blade root part is cut off.

[0043] In a specific embodiment, the first connecting rod 20 is a connecting rod with a rectangular cross-section.

[0044] In a specific embodiment, the second connecting rod 30 is a connecting rod with a circular cross-section.

[0045] In a specific implementation, the multi-rod connection structure is a regular polygonal geometric topological connection structure 31, specifically a 135° rod connection structure.

[0046] In a specific embodiment, the blade base 4 is provided with a plurality of first slide grooves 40, and the connecting rod mechanism 2 is connected to the blade base 4 via the first slide grooves. The first slide grooves 40 are rectangular slide grooves.

[0047] In a specific embodiment, a plurality of second slide grooves 50 are provided on the airfoil bottom plate 5; the connecting rod mechanism 2 is connected to the airfoil bottom plate 5 via the second slide grooves 50. The second slide grooves are rectangular slide grooves.

[0048] In a specific implementation, the airfoil bottom plate 5 is welded to the blade span structure 1 .

[0049] In a specific implementation, the connecting rod mechanism 2 is welded to the blade base 4 .

[0050] In a specific implementation, the connecting rod mechanism 2 is welded to the airfoil bottom plate 5 .

[0051] When this embodiment is working, the blades can be extended and retracted through the connecting rod mechanism 2 and the origami structure 3. In order to prevent the longer blades from having greater bending moments and torques when subjected to wind loads, thereby causing structural fatigue and damage, the connecting rod mechanism 2 and the origami structure 3 can reduce the bending moments and torques by contraction, so as to achieve the purpose of preventing the blades from being damaged. In addition, due to its good stability, the origami structure 3 can form a good match with the intercepted wind turbine blade structure 1, making it less prone to damage.

[0052] Components not described in detail in this embodiment are all existing components that can be purchased through public channels.

[0053] The above description of the embodiments is to facilitate the understanding and use of the invention by those skilled in the art. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the above embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the scope of protection of the present invention.

Claims

1. A retractable wind turbine blade, characterized in that: include: Blade extension structure (1), connecting rod mechanism (2), origami structure (3), blade base (4), airfoil bottom plate (5); The connecting rod mechanism (2) is a three-dimensional geometric topological structure formed by first connecting rods (20) intersecting each other in pairs, so as to realize the stretching movement; The origami structure (3) is a regular polygonal three-dimensional geometric topological structure formed by a second connecting rod (30) through a multi-rod connecting structure, and realizes stretching movement; The connecting rod mechanism (2) is respectively connected to the blade base (4) and the airfoil bottom plate (5); the airfoil bottom plate (5) is connected to the blade span structure (1).

2. A retractable wind turbine blade according to claim 1, characterized in that: The blade span structure (1) has an airfoil-shaped structure of the blade in the span direction.

3. The retractable wind turbine blade according to claim 1, characterized in that: The blade base (4) is provided with a plurality of first sliding grooves (40); the connecting rod mechanism (2) is connected to the blade base (4) via the first sliding grooves (40).

4. The retractable wind turbine blade according to claim 1, characterized in that: The wing profile bottom plate (5) is provided with a plurality of second sliding grooves (50); the connecting rod mechanism (2) is connected to the wing profile bottom plate (5) via the second sliding grooves (50).

5. The retractable wind turbine blade according to claim 1, characterized in that: The airfoil bottom plate (5) is welded to the blade span structure (1).

6. The retractable wind turbine blade according to claim 1, characterized in that: The connecting rod mechanism (2) is welded to the blade base (4).

7. The retractable wind turbine blade according to claim 1, characterized in that: The connecting rod mechanism (2) is welded to the airfoil bottom plate (5).

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