A movable wing type blade of a vertical axis wind turbine

Abstract

A movable airfoil blade for a vertical axis wind turbine includes: a structural frame, a movable airfoil, a limiting device, a shaft, a rotating support, and a counterweight. A reinforcing frame is mounted on one side of the airfoil's blade, and an opening is formed at a predetermined position on the reinforcing frame. The frame opening is connected to the movable airfoil via the rotating support and the shaft along an axial extension line at the predetermined position. The limiting device includes a first limiting device and / or a second limiting device, which limits the rotation range of the movable airfoil within the frame opening of the structural frame. The counterweight is mounted within the frame border of the reinforcing frame.

Description

Technical Field

[0001] This invention relates to the field of wind power engine technology, and in particular to a movable airfoil blade for a vertical axis wind power engine. Background Technology

[0002] Wind power, as a clean and renewable energy source, has experienced rapid development.

[0003] In vertical axis wind turbines, drag-type vertical axis wind turbines (such as cup turbines) reduce the total torque of the rotating shaft by the reverse torque generated by the blades in the upwind half of the turbine during operation. In contrast, vertical axis wind turbines with movable blades have a movable blade that is rotatably connected to the frame at the top and can be opened, as shown in 200820139674.X and 201110257812.0. When the turbine blades are in the downwind half of the turbine, the movable blade descends to close the air duct and perform work. When the turbine blades are in the upwind half of the turbine, the flat movable blade opens, and the wind passes directly through the middle of the frame, reducing the turbine drag. This minimizes the reverse torque of the blades in the upwind half of the turbine, thereby obtaining greater kinetic energy and theoretically achieving higher wind energy conversion efficiency.

[0004] The inventors discovered that the problems with this type of movable airfoil blade are that when the top of the movable airfoil is rotatably connected to the frame, and the thickness of the movable airfoil plate is large, the weight of the movable airfoil tends to increase, making it difficult for the movable airfoil to open at low wind speeds; when the weight of the movable airfoil plate is small, it is prone to deformation or insufficient durability, and the blade also has the disadvantage of low wind-catching efficiency in the downwind half-range. Therefore, further improvements to the technology of vertical axis wind turbines are needed to enable them to capture wind energy more effectively, which has become an urgent engineering problem to be solved. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of existing technologies for vertical axis wind turbine blades, such as the movable wing being rotatably connected to the frame at the top or the weight easily increasing when the wing plate is thick, the movable wing being difficult to open at low wind speeds, the wing being prone to deformation when the thickness is small, and the wind-catching efficiency in the downwind working zone. The invention provides a movable wing blade for vertical axis wind turbines with high structural strength, resistance to deformation, and higher wind-catching efficiency in the downwind working zone.

[0006] The objective of this invention is achieved through the following technical solution: A movable airfoil blade for a vertical axis wind turbine, the movable airfoil blade comprising: a structural frame, a movable airfoil, a limiting device, a shaft, a rotating support body, and a counterweight, wherein... A reinforcing frame is installed on one side of the wing plate of the movable wing, and an opening is made at a predetermined position on the reinforcing frame; The frame opening of the structure is connected to the movable wing via the rotating support and the shaft on the axis extension line at the preset position; The limiting device includes a first limiting device and / or a second limiting device, which limits the rotation range of the movable wing within the frame opening of the structural frame; The counterweight is installed inside the frame of the reinforcing frame. The advantages and beneficial effects of this invention are: 1. The movable wing has a higher wind-catching efficiency, which is beneficial to the wind power engine's higher wind energy conversion efficiency; 2. The movable wings have higher strength, longer durability, and are less prone to deformation; 3. Reduce carbon emissions and provide green energy; 4. Low manufacturing cost. Attached Figure Description

[0007] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art 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 the structures shown in these drawings without creative effort.

[0008] Figure 1 This is a three-dimensional schematic diagram of the single-frame movable airfoil blade of the present invention.

[0009] Figure 2 This is a three-dimensional schematic diagram of the structure frame of the single-frame movable airfoil blade of the present invention.

[0010] Figure 3 This is a three-dimensional schematic diagram of the movable wing of the single-frame movable wing blade of the present invention.

[0011] Figure 4 This is a three-dimensional schematic diagram of the multi-frame movable airfoil blade of the present invention. Detailed Implementation

[0012] The technical solutions of the embodiments of the present invention will be preferably 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.

[0013] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, vertical, horizontal, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0014] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, if "and / or" or "and / or" appears throughout the text, it includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies solutions A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention. Example

[0015] like Figure 1 , 2 As shown in Figures 3 and 4, a movable airfoil blade for a vertical axis wind turbine includes: a structural frame (1), a movable airfoil (2), a limiting device (3), a shaft (4), a rotating support (5), and a counterweight (6). A reinforcing frame (22) is installed on one side of the wing plate (21) of the movable wing (2), and an opening (23) is opened at a predetermined position on the reinforcing frame (22). The frame opening of the structural frame (1) is connected to the movable wing via the rotating support (5) and the shaft (4) on the axis extension line at the preset position; The limiting device (3) includes a first limiting device (31) and / or a second limiting device (32). The limiting device (3) limits the rotation range of the movable wing (2) within the frame opening of the structural frame (1) and limits the movable wing to rotate within a 90-degree range in the vertical and horizontal states within the frame opening of the structural frame (1) around the axis (4). The counterweight (6) is installed inside the frame of the reinforcing frame (22) to balance the weight of the wing plate below the preset position of the movable wing (2) so that the movable wing can rotate and open with less energy in the headwind half-zone.

[0016] In an optional implementation, the counterweight (6) is an iron block, or multiple steel plates stacked together, or a steel pipe filled with filler, and is installed in the frame of the reinforcing frame (22) on the side where the distance between the frame and the preset position axis is shorter. A hole is opened at the bottom of the counterweight for installing a center of gravity fine-tuning component.

[0017] In an optional embodiment, the rotating support (5) is a bearing.

[0018] In an optional embodiment, the bearing's centerline bearing is fixed vertically to the frame of the structural frame (1), the outer ring of the bearing is inserted into a coaxial steel pipe, the bearing is fixed to the opening of the steel pipe using a snap ring, the inner ring of the bearing is inserted into the shaft (4), and the other side of the shaft (4) is connected to the reinforcing frame (22) of the movable wing; or the bearing's centerline bearing is fixed vertically to the reinforcing frame (22) of the movable wing, the inner ring of the bearing is inserted into the shaft (4), and the shaft (4) is simultaneously connected to the frame of the structural frame (1).

[0019] The wing plate (21) is a flat surface, or a convex surface with the middle higher than the edge, or an arc-shaped surface with the middle higher than the upper and lower ends, and the other side of the wing plate (21) is smooth.

[0020] In an optional implementation, the structural frame is fastened to the movable wing using rivet nuts.

[0021] The rivet nut includes a connecting shaft rivet nut and an anti-rotation rivet nut. The connecting shaft rivet nut is fixed on a steel plate. Several holes are opened on the steel plate. The anti-rotation rivet nut is installed on the frame of the reinforcing frame at the preset position of the several holes at the coaxial center position of the holes.

[0022] In an optional implementation, the reinforcing frame (22) includes an edge reinforcing frame (24) and an internal reinforcing frame (25).

[0023] The edge reinforcement frame (24) is formed by bending a metal plate on one side of the movable wing; the inner reinforcement frame (25) includes longitudinal and transverse metal strips, and the inner reinforcement frame (222) is formed by welding metal strips to the inside of the edge reinforcement frame (221).

[0024] In an optional implementation, the preset position is any part within the upper half of the longitudinal frame length of the reinforcing frame (22) when it is in a vertical state.

[0025] In an optional embodiment, the structural frame (1) is made by welding steel pipes, and the frame openings of the structural frame (1) are several in the longitudinal and / or transverse directions.

[0026] In an optional embodiment, the first limiting device (31) is installed on the structural frame (1) at the upper part above the axis extension line of the preset position when the blade is in a vertical state during the movement of the wing, and is located on the side of the wing where the reinforcing frame (22) is installed.

[0027] In an optional embodiment, the second limiting device (32) is installed on the structural frame (1) at a position below the axis extension line of the preset position when the blade is in a vertical state during the movement of the wing, and is located on one side of the plane of the wing blade.

[0028] The movable airfoil blade also includes a steel wheel at the lower part of the structural frame (1) and a flange connection device on the side of the structural frame (1).

[0029] The limiting device (3) is a thin steel plate, which is welded onto the structural frame (1).

[0030] Due to the asymmetry of the wind turbine blades and the unevenness of air resistance, the wind exerts a driving torque on the blades around the axis of rotation, which causes the wind turbine to start rotating.

[0031] F = 1 / 2 × ρ × S × V 2 × C Where ρ is the air density, typically taken as 1.25 kg / m³. S — Windward area of ​​the wind turbine V — Incoming wind speed C — Aerodynamic coefficient For a hemispherical wind turbine: the value of C is 1.33 when the windward half is concave and the windward half is convex. The value of C is 0.34. For cylindrical wind turbines: the C coefficient is 2.3 when the windward half-region is concave; and the C coefficient is 1.2 when the windward half-region is convex. The number of reinforcing frames installed on the movable wing blades increases the aerodynamic coefficient of the blades in the downwind half-zone; the installation of counterweights reduces the wind energy required for the movable wing to open, thereby reducing the aerodynamic coefficient of the blades in the upwind half-zone and improving wind energy conversion efficiency.

[0032] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements can be made without departing from the principle of the present invention, and these improvements should also be considered within the scope of protection of the present invention.

Claims

1. A movable airfoil blade for a vertical axis wind turbine, characterized in that, The movable airfoil blade includes: a structural frame, a movable airfoil, a limiting device, a shaft, a rotating support body, and a counterweight. A reinforcing frame is installed on one side of the wing plate of the movable wing, and an opening is made at a predetermined position on the reinforcing frame; The frame opening of the structure is connected to the movable wing via the rotating support and the shaft on the axis extension line at the preset position; The limiting device includes a first limiting device and / or a second limiting device, which limits the rotation range of the movable wing within the frame opening of the structural frame; The counterweight is installed inside the frame of the reinforcing frame.

2. The movable airfoil blade of a vertical axis wind turbine according to claim 1, characterized in that: The counterweight is an iron block, or multiple steel plates stacked together, or a steel pipe filled with filler, and is installed in the frame on the side of the reinforcing frame where the distance between the frame edge and the center line of the preset position is shorter.

3. The movable airfoil blade of a vertical axis wind turbine according to claim 1, characterized in that: The rotating support is a bearing.

4. The movable airfoil blade of a vertical axis wind turbine according to claims 1 and 3, characterized in that: The bearing's centerline bearing is vertically fixed to the frame of the structural frame. The outer ring of the bearing is inserted into a coaxial steel tube. The bearing is secured to the steel tube opening with a snap ring. The inner ring of the bearing is inserted into the shaft. The other side of the shaft is connected to the reinforcing frame of the movable wing. Alternatively, the bearing's centerline bearing is vertically fixed to the reinforcing frame of the movable wing. The inner ring of the bearing is inserted into the shaft, and the shaft is simultaneously connected to the frame of the structural frame.

5. The movable airfoil blade of a vertical axis wind turbine according to claim 1, characterized in that: The structural frame is fastened to the movable wing using rivet nuts.

6. The movable airfoil blade of a vertical axis wind turbine according to claim 1, characterized in that: The reinforcing frame includes an edge reinforcing frame and an internal reinforcing frame.

7. The movable airfoil blade of a vertical axis wind turbine according to claim 1, characterized in that: The preset position is any part within the upper half of the longitudinal frame length when the reinforced frame is in a vertical state.

8. The movable airfoil blade of a vertical axis wind turbine according to claim 1, characterized in that: The structural frame is made of welded steel pipes, and the frame openings of the structural frame are several in the longitudinal and / or transverse directions.

9. The movable airfoil blade of a vertical axis wind turbine according to claim 1, characterized in that: The first limiting device is installed on the structural frame, above the axis extension line of the preset position when the blade is in a vertical state during the movable wing, and located on the side where the reinforcing frame is installed on the movable wing.

10. The movable airfoil blade of a vertical axis wind turbine according to claim 1, characterized in that: The second limiting device is installed on the structural frame, below the axis extension line of the preset position when the blade is in a vertical state during the movable wing operation, and located on one side of the plane of the movable wing blade.

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