A darrieus wind turbine capable of generating lift quickly at low wind speed

Abstract

This invention discloses a Darrieux wind turbine capable of rapidly generating lift under low wind speeds, relating to the field of wind turbine technology. It includes: a rotating shaft, several main blades, several blade assemblies, and several supporting structures. The supporting structures are uniformly arranged circumferentially on the rotating shaft. The main blades and the blade assemblies are both disposed on the supporting structures. The blade assemblies are located between the main blades and the rotating shaft. One side of the blade assembly increases its contact area with the wind when facing the wind, while the other side decreases its contact area with the wind when facing the wind. This invention can generate lift under low wind speeds, enabling startup.

Description

Technical Field

[0001] This invention relates to the field of wind turbine technology, and in particular to a Darrieux wind turbine that can quickly generate lift at low wind speeds. Background Technology

[0002] Wind energy, as a clean and renewable energy source, is one of the core utilization methods for achieving energy structure transformation and reducing carbon emissions. Existing wind power generation equipment is mainly divided into two categories: horizontal axis wind turbines and vertical axis wind turbines. Traditional vertical axis Darrieux wind turbines have simple blade construction, relatively low cost, and an aesthetically pleasing design, making them suitable for use in both urban and rural areas, and theoretically have significant development potential. However, Darrieux wind turbines have a major drawback: at low wind speeds, they are insufficient to generate lift from stationary blades. Therefore, if relying entirely on natural wind to start from zero, they often require a certain wind speed to begin rotating. Summary of the Invention

[0003] The purpose of this invention is to provide a Darrieux wind turbine that can quickly generate lift at low wind speeds, thereby solving the problems existing in the prior art and enabling it to generate lift at low wind speeds for startup.

[0004] To achieve the above objectives, the present invention provides the following solution: This invention provides a Darrieux wind turbine that can quickly generate lift at low wind speeds, comprising: a rotating shaft, a plurality of main blades, a plurality of blade assemblies, and a plurality of supporting structures. The plurality of supporting structures are uniformly arranged on the rotating shaft along its circumference. The main blades and the blade assemblies are both disposed on the supporting structures. The blade assemblies are located between the main blades and the rotating shaft. One side of the blade assembly can increase its contact area with the wind when facing the wind, and the other side of the blade assembly can decrease its contact area with the wind when facing the wind.

[0005] In some specific designs, the blade assembly includes a drive structure and two opening and closing blades. The two opening and closing blades are symmetrically arranged. The drive structure can open and close the two opening and closing blades. When the two opening and closing blades are open, the interaction area between the blade assembly and the wind is increased. When the two opening and closing blades are closed, the interaction area between the blade assembly and the wind is decreased.

[0006] In some specific designs, when the two opening blades are open, the windward side of the blade assembly is concave.

[0007] In some specific designs, one side of the two opening and closing blades is rotatably connected by a hinge shaft, which is connected to one end of a connecting rod. The drive structure includes a drive rod and a drive blade. One end of the drive rod is connected to the drive blade, and the middle part of the drive rod is rotatably connected to the other end of the connecting rod. The other end of the drive rod contacts the inner side of one opening and closing blade, and the drive blade can contact the inner side of the other opening and closing blade.

[0008] In some specific designs, a limiting structure is also included. The limiting structure is connected to the hinge shaft and is used to limit the maximum opening angle of the opening and closing blades.

[0009] In some specific designs, a stop is provided on the connecting rod to limit the maximum swing angle of the drive rod.

[0010] In some specific designs, the ratio of the wheelbase of the main blade to the wheelbase of the blade assembly is greater than 4.

[0011] In some specific designs, a pull rope structure is also included, which includes several first pull ropes and several second pull ropes. One end of the first pull rope is connected to the pivot, and the other end of the first pull rope is connected to the end of the support structure away from the pivot. One end of the second pull rope is connected to the end of a support structure away from the pivot, and the other end of the second pull rope is connected to the end of an adjacent support structure away from the pivot.

[0012] The present invention achieves the following technical effects compared to the prior art: This invention, through its blade assembly, requires no additional power and is driven entirely by wind. It can generate sufficient lift, i.e., start-up torque, even at very low wind speeds, directly driving the shaft to rotate. This solves the problem of traditional Darrieux wind turbines being unable to start automatically at low wind speeds and improves the efficiency of utilizing light winds. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of a Darrieux wind turbine that can quickly generate lift at low wind speeds, according to some embodiments of the present invention. Figure 2 This is a schematic diagram of a blade assembly in some embodiments of the present invention. Figure 1 ; Figure 3 for Figure 2 Enlarged view of a portion of point A in the middle; Figure 4 This is a schematic diagram of a blade assembly in some embodiments of the present invention. Figure 2 ; Figure 5 for Figure 4 Enlarged view of a portion of point B in the middle; Figure 6 This is a schematic diagram illustrating the working principle of the Darrieux wind turbine, which can quickly generate lift at low wind speeds, in some embodiments of the present invention. In the diagram: 1-rotating shaft, 2-main blade, 3-blade assembly, 4-support rod, 5-bracket, 6-drive blade, 7-first pull rope, 8-second pull rope, 9-fixing component, 10-connecting rod, 11-stop block, 12-opening and closing blade, 13-hinge shaft, 14-limiting structure, 15-drive rod. Detailed Implementation

[0015] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0016] The purpose of this invention is to provide a Darrieux wind turbine that can quickly generate lift at low wind speeds, thereby solving the problems existing in the prior art and enabling it to generate lift at low wind speeds for startup.

[0017] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0018] like Figures 1 to 6 As shown, this embodiment provides a Darrieux wind turbine that can quickly generate lift at low wind speeds (3m / s-5m / s). It includes: a rotating shaft 1, several main blades 2, several blade assemblies 3, and several supporting structures. The supporting structures are evenly arranged on the rotating shaft 1 along its circumference. The main blades 2 and blade assemblies 3 are both mounted on the supporting structures, with the blade assemblies 3 located between the main blades 2 and the rotating shaft 1. One side of the blade assembly 3 increases its contact area with the wind when facing the wind, while the other side decreases its contact area. In this embodiment, when facing the wind on one side, the blade assembly 3 increases its contact area with the wind, resisting wind resistance and generating thrust; when facing the wind on the other side, the blade assembly 3 decreases its contact area with the wind, reducing wind resistance to almost zero. This embodiment uses blade assembly 3, which requires no additional power and is driven entirely by wind. It can generate thrust when facing the wind on one side and near-zero resistance when facing the wind on the other side. Blade assembly 3 in this embodiment can generate lift even when the wind speed is very low, producing sufficient starting torque to directly drive the rotating shaft 1 to rotate. This solves the problem that traditional Darrieux wind turbines cannot start automatically in light winds and improves the efficiency of light wind utilization.

[0019] In this embodiment, the blade assembly 3 includes a drive structure and two opening and closing blades 12. The opening and closing blades 12 are flat blades, and the two opening and closing blades 12 are symmetrically arranged. The drive structure opens the opening and closing blades 12 when facing the wind.

[0020] In some specific embodiments, one side of the two opening and closing blades 12 is rotatably connected by a hinge shaft 13. A torsion spring is provided at the hinge shaft 13. One end of the torsion spring contacts one opening and closing blade 12, and the other end contacts the other opening and closing blade 12. The torsion spring can provide the power for the two opening and closing blades 12 to close. The hinge shaft 13 is connected to one end of the connecting rod 10. The two opening and closing blades 12 are symmetrically arranged on both sides of the connecting rod 10. The driving structure includes a driving rod 15 and a driving blade 6. The driving blade 6 has an action surface that can interact with the wind. The action surface can be a plane or a concave surface. One end of the driving rod 15 is connected to the driving blade 6, and the middle part of the driving rod 15 is rotatably connected to the other end of the connecting rod 10. When the wind acts on the driving blade 6, the other end of the driving rod 15 contacts the inner side of one opening and closing blade 12, and the driving blade 6 contacts the inner side of the other opening and closing blade 12. When the two opening and closing blades 12 are closed, the driving blade 6 is located outside the two opening and closing blades 12, that is, the opening and closing blades 12 do not wrap around the driving blade 6. A stop 11 is provided on the connecting rod 10. The stop 11 is used to limit the maximum swing angle of the drive rod 15 so as to prevent the other end of the drive rod 15 from swinging in the direction of the other opening and closing blade 12.

[0021] In some specific embodiments, a limiting structure 14 is also included. The limiting structure 14 is preferably a limiting block. The limiting structure 14 is connected to the hinge shaft 13 and is located on the outside of the opening and closing blade 12. The limiting structure 14 is used to limit the maximum opening angle of the opening and closing blade 12.

[0022] In some specific embodiments, a plurality of blade assemblies 3 may be provided between each main blade 2 and the rotating shaft 1. The limiting structure 14 in the blade assembly 3 may be configured such that when two opening and closing blades 12 in adjacent blade assemblies 3 are opened to the maximum position, adjacent opening and closing blades 12 in different blade assemblies 3 can contact each other.

[0023] In some specific embodiments, the blade assembly 3 further includes a bracket 5, which is fixed to the support structure. The hinge shaft 13 and the limiting structure 14 are both disposed on the bracket 5.

[0024] The two opening and closing blades 12 open in the wind, increasing the contact area with the wind, thus resisting wind resistance and generating thrust. Specifically, when the wind acts on one side of the drive blade 6, the drive blade 6 drives the drive rod 15 to rotate at the connection point between the drive rod 15 and the connecting rod 10. The other end of the drive rod 15 pushes one opening and closing blade 12, while the drive blade 6 pushes the other opening and closing blade 12, causing the two opening and closing blades 12 to open. When the opening and closing blade 12 contacts the limiting structure 14, the opening and closing blade 12 stops rotating, forming a complete windproof concave surface. At this time, the opening and closing blade 12 fully withstands the impact force of the wind, converting wind energy into torque that drives the rotating shaft 1 to rotate.

[0025] The two opening and closing blades 12 close in the windward direction, reducing the area of ​​interaction with the wind and thus reducing wind resistance to almost zero. Specifically, as the convex surface of the blade assembly 3 rotates to the windward side, the wind acts on the other side of the driving blade 6 and on the opening and closing blades 12. The opening and closing blades 12 close, making them approximately parallel to the driving blade 6 and approximately parallel to the wind direction. The wind can pass through both sides of the blade assembly 3, and the air resistance is reduced to almost zero, eliminating the reverse resistance generated by traditional fixed blades on the windward side.

[0026] In some specific embodiments, the main blade 2 is a straight blade.

[0027] In some specific embodiments, the blade assembly 3 is close to the shaft 1 and far from the main blade 2. The ratio of the wheelbase of the main blade 2 (the distance between the centerline of the main blade 2 and the axis of the shaft 1) to the wheelbase of each blade assembly 3 (the distance between the centerline of the blade assembly 3 and the axis of the shaft 1) is greater than 4. Thus, when the tip speed ratio of the main blade 2 reaches 4, the blade assembly 3 can still generate thrust, i.e. lift, so the wind energy utilization efficiency is greater than that of the traditional Darrieux blade. At the same time, it can also effectively prevent the risk of jamming in special positions of the traditional Darrieux blade.

[0028] In some specific embodiments, each support structure includes two support rods 4, one of which is located above the other. The two support rods 4 are arranged in parallel, one end of each support rod 4 is fixedly connected to the rotating shaft 1, and the other end of each support rod 4 is fixedly connected to the main blade 2.

[0029] In some specific embodiments, a pull rope structure is also included. The pull rope structure includes several first pull ropes 7 and several second pull ropes 8. One end of the first pull rope 7 is connected to the rotating shaft 1, and the other end of the first pull rope 7 is connected to a support structure. One end of the second pull rope 8 is connected to a support structure, and the other end of the second pull rope 8 is connected to an adjacent support structure. Specifically, several fixing members 9 are provided at both the upper and lower ends of the rotating shaft 1, and several fixing members 9 are provided at the end of each support rod 4 near the main blade 2. The first pull ropes 7 are divided into two groups: one end of the first pull rope 7 of the first group is fixedly connected to the fixing member 9 at the upper end of the rotating shaft 1, and the other end of the first pull rope 7 of the first group is fixedly connected to the fixing member 9 on the support rod 4 at the upper end; one end of the first pull rope 7 of the second group is fixedly connected to the fixing member 9 at the lower end of the rotating shaft 1, and the other end of the first pull rope 7 of the second group is fixedly connected to the fixing member 9 on the support rod 4 at the lower end. The second pull rope 8 is divided into two groups: one end of the second pull rope 8 of the first group is fixedly connected to the fixing member 9 of the upper support rod 4, and the other end of the second pull rope 8 of the first group is fixedly connected to the fixing member 9 of the adjacent upper support rod 4; one end of the second pull rope 8 of the second group is fixedly connected to the fixing member 9 of the lower support rod 4, and the other end of the second pull rope 8 of the second group is fixedly connected to the fixing member 9 of the adjacent lower support rod 4. This embodiment replaces the traditional metal truss structure with a pull rope structure, improving strength and reducing the overall weight of the structure, thereby reducing the wind energy consumed to overcome its own mechanical resistance, and significantly reducing the cost of the entire device.

[0030] This embodiment, through the blade assembly 3, requires no additional power and is driven entirely by wind power. It can generate thrust when facing the wind on one side and achieve near-zero resistance when facing the wind on the other side. The blade assembly 3 in this embodiment can generate sufficient starting torque even at very low wind speeds, directly driving the shaft 1 to rotate. This solves the problem of traditional Darrieux fans failing to start automatically in light winds, thus improving the efficiency of light wind utilization. Once the shaft 1 is driven to a certain speed by the blade assembly 3, the lift of the main blades 2 begins to dominate, driving the fan into a high-speed operating state. At this time, the blade assembly 3 continues to play a role. In this embodiment, the ratio of the wheelbase of the main blades 2 to the wheelbase of the blade assembly 3 is greater than 4. When the tip speed ratio of the main blades 2 reaches 4, the torque continuously supplemented by the blade assembly 3 can effectively prevent the Darrieux main blades 2 from jamming at the rotation dead point, improving operational stability. This embodiment addresses the shortcomings of traditional Darrieux wind turbines, such as difficulty in starting in low winds, low utilization of wind energy at low speeds, and high headwind resistance. By combining the automatically opening and closing blade assembly 3 with the main blade 2 to increase resistance, and using a lightweight drawstring structure, it achieves a significant improvement in wind energy utilization across all wind speed ranges, while also substantially reducing the cost per kilowatt-hour. Furthermore, due to its high efficiency in low winds, the turbine can be scaled up or down, making it suitable for a wide range of applications, almost anywhere. It can also generate electricity around the clock, making it ideal for home and office use.

[0031] In the description of this invention, it should be understood that the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0032] In the description of this invention, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0033] If this invention discloses or relates to components or structural parts that are fixedly connected to each other, then, unless otherwise stated, a fixed connection can be understood as: a detachable fixed connection (e.g., using bolts or screws) or a non-detachable fixed connection (e.g., riveting, welding). Of course, a fixed connection can also be replaced by an integral structure (e.g., manufactured in one piece using a casting process) (except where it is obviously impossible to use an integral molding process).

[0034] In addition, unless otherwise stated, the terms used in any of the technical solutions disclosed in this invention to indicate positional relationships or shapes include states or shapes that are similar to, close to, or approximate with those states or shapes.

[0035] Any component provided by this invention can be assembled from multiple individual components or can be a single component manufactured by a one-piece molding process.

[0036] It should be noted that the structures, proportions, sizes, etc., depicted in the accompanying drawings of this specification are only used to complement the content disclosed in the specification, so as to enable those skilled in the art to understand and read them, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0037] It should also be noted that in the embodiments of this application, the same reference numerals are used to denote the same component or the same part.

[0038] Any adaptive changes made according to actual needs are within the scope of protection of this invention.

[0039] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A Darrieux wind turbine capable of rapidly generating lift at low wind speeds, characterized in that: include: A rotating shaft (1), several main blades (2), several blade assemblies (3) and several supporting structures are provided. The supporting structures are evenly arranged on the rotating shaft (1) along the circumference of the rotating shaft (1). The main blades (2) and the blade assemblies (3) are both arranged on the supporting structures. The blade assemblies (3) are located between the main blades (2) and the rotating shaft (1). One side of the blade assembly (3) can increase the area of ​​interaction with the wind when facing the wind, and the other side of the blade assembly (3) can decrease the area of ​​interaction with the wind when facing the wind.

2. The Darrieux wind turbine that can rapidly generate lift at low wind speeds according to claim 1, characterized in that: The blade assembly (3) includes a drive structure and two opening and closing blades (12). The two opening and closing blades (12) are symmetrically arranged. The drive structure can open and close the two opening and closing blades (12). When the two opening and closing blades (12) are open, the interaction area between the blade assembly (3) and the wind is increased. When the two opening and closing blades (12) are closed, the interaction area between the blade assembly (3) and the wind is decreased.

3. The Darrieux wind turbine that can rapidly generate lift at low wind speeds according to claim 2, characterized in that: When the two opening and closing blades (12) are open, the windward surface of the blade assembly (3) is concave.

4. The Darrieux wind turbine that can rapidly generate lift at low wind speeds according to claim 2, characterized in that: One side of the two opening and closing blades (12) is rotatably connected by a hinge shaft (13), which is connected to one end of a connecting rod (10). The driving structure includes a driving rod (15) and a driving blade (6). One end of the driving rod (15) is connected to the driving blade (6), and the middle part of the driving rod (15) is rotatably connected to the other end of the connecting rod (10). The other end of the driving rod (15) contacts the inner side of one of the opening and closing blades (12), and the driving blade (6) can contact the inner side of the other opening and closing blade (12).

5. The Darrieux wind turbine that can rapidly generate lift at low wind speeds according to claim 4, characterized in that: It also includes a limiting structure (14) connected to the hinge shaft (13), the limiting structure (14) being used to limit the maximum opening angle of the opening and closing blade (12).

6. The Darrieux wind turbine that can rapidly generate lift at low wind speeds according to claim 4, characterized in that: A stop (11) is provided on the connecting rod (10), and the stop (11) is used to limit the maximum swing angle of the drive rod (15).

7. The Darrieux wind turbine that can rapidly generate lift at low wind speeds according to claim 1, characterized in that: The ratio of the wheelbase of the main blade (2) to the wheelbase of the blade assembly (3) is greater than 4.

8. The Darrieux wind turbine that can rapidly generate lift at low wind speeds according to claim 1, characterized in that: It also includes a pull rope structure, which includes a plurality of first pull ropes (7) and a plurality of second pull ropes (8). One end of the first pull rope (7) is connected to the rotating shaft (1), and the other end of the first pull rope (7) is connected to the end of the support structure away from the rotating shaft (1). One end of the second pull rope (8) is connected to the end of the support structure away from the rotating shaft (1), and the other end of the second pull rope (8) is connected to the end of the adjacent support structure away from the rotating shaft (1).

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