Double-layer wing type vertical axis wind turbine

Abstract

The utility model discloses a double-layer wing type vertical axis wind turbine, which relates to the technical field of wind power generation and comprises a wind turbine body and at least two wing type blade groups, each airfoil blade group comprises a main airfoil blade, an auxiliary airfoil blade and a plate sheet; the auxiliary wing-shaped blades are arranged on the sides, close to the rotating center line of the wind turbine body, of the main wing-shaped blades, and first wind passing channels are formed between the auxiliary wing-shaped blades and the main wing-shaped blades. The plate sheets are arranged on the sides, close to the rotating center line of the wind turbine body, of the main wing-shaped blades, and second wind passing channels communicated with the first wind passing channels are formed between the plate sheets and the main wing-shaped blades. And a clearance space is formed between one side edge of the plate sheet and the tail edge of the auxiliary airfoil blade. The pressure difference between the upper surface and the lower surface of the main wing-shaped blade can be increased through the design of the plate sheets, the blade tip vortex generated on the lower surface of the main wing-shaped blade can be weakened, then the lift force borne by the main wing-shaped blade is increased, and the purpose of further improving the self-starting performance and the power generation efficiency of the wind turbine is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of wind power generation, and in particular to a double-layer airfoil vertical axis wind turbine. Background Art

[0002] Vertical axis wind turbines can be divided into lift type and drag type according to the working principle of wind turbine blades. Among them, lift type wind turbines rely on the lift generated by the blades in the wind field to drive the wind turbine to rotate. Darrieus wind turbine is the earliest and more representative lift type vertical axis wind turbine.

[0003] According to the shape of Darrieus wind turbines, they can be divided into two types: curved blades and straight blades, such as φ-shaped, H-shaped and △-shaped. Among them, straight blade H-shaped wind turbines are more commonly used, and their blades are mostly airfoil blades. Straight blade H-shaped wind turbines can be divided into two types: single-layer airfoil design (single-layer airfoil blade design) and double-layer airfoil design (double-layer airfoil blade design). Compared with the single-layer airfoil design, the double-layer airfoil design adds an aileron blade. The added aileron blade can increase the pressure difference between the upper and lower surfaces of the main airfoil blade, thereby increasing the instantaneous torque, and the aileron blade can be started at low wind speeds, which improves the overall starting performance. It can be seen that the wind turbine with a double-layer airfoil design can achieve higher power generation efficiency than the wind turbine with a single-layer airfoil design. However, after research, it was found that the existing wind turbine with a double-layer airfoil design still has room for further improvement in terms of torque improvement. Utility Model Content

[0004] In view of this, the purpose of the present application is to provide a double-wing vertical axis wind turbine to improve the torque of the existing wind turbine with a double-wing design, so as to further improve the self-starting performance and power generation efficiency of the wind turbine.

[0005] In order to achieve the above technical objectives, the present application provides a double-layer airfoil vertical axis wind turbine, comprising a wind turbine body and at least two airfoil blade groups;

[0006] At least two of the airfoil blade groups are mounted on the wind turbine body and are evenly distributed around the circumference of the rotation centerline of the wind turbine body;

[0007] Each of the airfoil blade groups includes a main airfoil blade, an auxiliary airfoil blade and a plate;

[0008] The aileron blade is disposed on a side of the main aileron blade that is closer to the rotation centerline of the wind turbine body, and forms a first wind passage between the aileron blade and the main aileron blade;

[0009] The plate is arranged on a side of the main airfoil blade close to the rotation centerline of the wind turbine body, and forms a second air passage communicating with the first air passage with the main airfoil blade;

[0010] There is a gap space between one side edge of the plate and the trailing edge of the aileron-shaped blade.

[0011] Furthermore, the aileron-shaped blades can be set with an adjustable rotation angle.

[0012] Furthermore, the plate can be set with an adjustable rotation angle.

[0013] Furthermore, the wind turbine body includes a base, a rotating shaft and a rotating frame;

[0014] The rotating shaft is mounted on the base;

[0015] The rotating frame is mounted on the rotating shaft and can rotate freely around the rotating shaft;

[0016] At least two of the airfoil blade groups are mounted on the rotating frame and are evenly distributed around the circumference of the rotating shaft.

[0017] Further, the rotating frame includes an upper connecting member, a lower connecting member and at least two beams;

[0018] The upper connecting member and the lower connecting member are rotatably mounted on the rotating shaft and are arranged up and down;

[0019] At least two of the beams are connected to the upper connecting member and the lower connecting member and are evenly distributed around the circumference of the rotating shaft, and are used to fix the airfoil blade groups in a one-to-one correspondence;

[0020] Each of the beam frames comprises an upper beam and a lower beam;

[0021] The upper beam is fixedly connected to the upper connecting member;

[0022] The lower beam is fixedly connected to the lower connecting member;

[0023] The airfoil blade group is fixed between the upper beam and the lower beam.

[0024] Furthermore, the cross-sections of the upper beam and the lower beam are elliptical.

[0025] Furthermore, main wing fixing columns are fixed to the bottom of the upper beam and the bottom of the lower beam;

[0026] The main airfoil blade is fixed between the main wing fixing column located above and the main wing fixing column located below.

[0027] Furthermore, one side of the upper beam and one side of the lower beam are both connected with an aileron fixing bracket;

[0028] Aileron fixing columns are fixed to the bottom of the aileron fixing bracket located above and the top of the aileron fixing bracket located below;

[0029] The aileron blade is fixed between the aileron fixing column located above and the aileron fixing column located below;

[0030] The other side of the upper beam and the other side of the lower beam are both connected with a plate fixing bracket;

[0031] The plate is fixed between the plate fixing bracket located above and the plate fixing bracket located below.

[0032] It can be seen from the above technical solutions that the double-layer airfoil vertical axis wind turbine designed in this application, based on the design of the main airfoil blade and the aileron blade, has a new plate design, and the plate is placed at a certain distance from the trailing edge of the aileron blade, and a second air passage is formed between the plate and the main airfoil blade to connect the first air passage formed between the aileron blade and the main airfoil blade. The newly added plate can increase the airflow that squeezes the main airfoil blade, increase the squeezing effect on the lower surface of the main airfoil blade, weaken the blade tip vortex generated on the lower surface of the main airfoil blade, thereby further increasing the pressure difference between the upper and lower surfaces of the main airfoil blade, and then increasing the lift on the main airfoil blade, so as to further improve the self-starting performance and power generation efficiency of the wind turbine. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0034] Figure 1 A front view of a double-layer airfoil vertical axis wind turbine provided in the present application;

[0035] Figure 2 A side view of a double-layer airfoil vertical axis wind turbine provided in the present application;

[0036] Figure 3 A top view of a double-layer airfoil vertical axis wind turbine provided in the present application;

[0037] Figure 4 It is a first partial enlarged schematic diagram of a double-layer airfoil vertical axis wind turbine provided in the present application;

[0038] Figure 5 A three-dimensional diagram of a double-layer airfoil vertical axis wind turbine provided in the present application;

[0039] Figure 6 A second partial enlarged schematic diagram of a double-layer airfoil vertical axis wind turbine provided in the present application;

[0040] Figure 7 A torque monitoring curve diagram of a double-layer airfoil vertical axis wind turbine and a traditional straight-blade H-shaped wind turbine provided in this application;

[0041] Figure 8 A schematic diagram of a simulated structure of a comparison working condition 1 of a main airfoil blade, an aileron blade and a plate of a double-layer airfoil vertical axis wind turbine provided in the present application;

[0042] Fig. 9 A schematic diagram of a simulated structure of a comparison working condition 2 of a main airfoil blade, an aileron blade and a plate of a double-layer airfoil vertical axis wind turbine provided in the present application;

[0043] In the figure: 100, wind turbine body; 200, airfoil blade group; 201, first wind passage; 202, second wind passage; 1, main airfoil blade; 11, upper surface; 12, lower surface; 2, plate; 3, aileron blade; 4, rotating shaft; 5, base; 6, rotating frame; 61, upper beam; 62, upper connecting piece; 63, lower beam; 64, lower connecting piece; 71, main wing fixing column; 72, aileron fixing column; 73, aileron fixing bracket; 74, plate fixing bracket. DETAILED DESCRIPTION

[0044] The technical solutions of the embodiments of the present application will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, not all of them. All other embodiments obtained by ordinary technicians in this field without creative work based on the embodiments in the embodiments of the present application are within the scope of protection of the embodiments of the present application.

[0045] In the description of the embodiments of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0046] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a replaceable connection, or an integral connection, it can be a mechanical connection, it can be an electrical connection, it can be a direct connection, it can be indirectly connected through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0047] The embodiment of the present application discloses a double-layer airfoil vertical axis wind turbine.

[0048] See also Figures 1 to 3 An embodiment of a double-layer airfoil vertical axis wind turbine provided in the embodiments of the present application includes:

[0049] A wind turbine body 200 and at least two airfoil blade assemblies 100 .

[0050] At least two airfoil blade groups 100 are installed on the wind turbine body 200 and are evenly distributed around the rotation centerline of the wind turbine body 200. The present application specifically designs two airfoil blade groups 100. Technical personnel in this field can design three, four or more as needed, without specific limitation.

[0051] Each airfoil blade group 100 includes a main airfoil blade 1, an aileron blade 3 and a plate 2. The main airfoil blade 1 and the aileron blade 3 have an airfoil blade design; and the plate 2 can be understood as a straight plate 2-shaped blade, and its thickness can be designed according to actual needs.

[0052] The aileron blade 3 is arranged on the side of the main aileron blade 1 close to the rotation centerline of the wind turbine body 200, and forms a first wind passage 201 between the main aileron blade 1. The specific position distribution between the main aileron blade 1 and the aileron blade 3 can refer to the existing double-layer aileron blade design, and the details are not repeated here.

[0053] The plate 2 is arranged on the side of the main airfoil blade 1 close to the rotation centerline of the wind turbine body 200, and forms a second air passage 202 connected to the first air passage 201 between the main airfoil blade 1, and there is a gap space between one side of the plate 2 and the trailing edge of the aileron blade 3.

[0054] like Figure 3 As shown, the auxiliary airfoil blade 3 is arranged parallel to the main airfoil blade 1 and is staggered with the main airfoil blade 1 .

[0055] Specifically, the projection of the leading edge of the aileron blade 3 in a direction perpendicular to the rotation centerline of the wind turbine body 200 is located outside the projection of the leading edge of the main aileron blade 1 in a direction perpendicular to the rotation centerline of the wind turbine body 200. It can be understood that the leading edge of the aileron blade 3 is not aligned with the leading edge of the main aileron blade 1, and is specifically arranged outside the leading edge of the main aileron blade 1 along the direction from the trailing edge to the leading edge of the main aileron blade 1.

[0056] The projection of the trailing edge of the aileron blade 3 in a direction perpendicular to the rotation centerline of the wind turbine body 200 is located above the projection of the leading edge of the main aileron blade 1 in a direction perpendicular to the rotation centerline of the wind turbine body 200 .

[0057] Through the above design, a first air passage 201 with a larger air inlet can be formed between the main airfoil blade 1 and the secondary airfoil blade 3 .

[0058] When the wind turbine blades rotate, there is airflow separation, which will affect the aerodynamic performance of the blades. The purpose of setting the main airfoil blade 1 and the aileron blade 3 to be staggered is to reconnect the airflow shear layer separated from the surface of the aileron blade 3 on the surface of the main airfoil blade 1, thereby reducing the resistance of the main airfoil blade 1 and reducing the lift loss of the main airfoil blade 1.

[0059] like Figure 3 As shown, the other side of the plate 2 is arranged closer to the main airfoil blade 1 than one side of the plate 2, so that the plate 2 is arranged at an inclination relative to the main airfoil blade 1. It can be understood that the plate 2 is arranged at an inclination in such a way that the other side of the plate 2 is closer to the main airfoil blade 1, so that the generated airflow can form a greater squeezing force on the lower surface 12 of the main airfoil blade 1.

[0060] The projection of the plate 2 in a direction perpendicular to the rotation centerline of the wind turbine body 200 is located above the projection of the main airfoil blade 1 in a direction perpendicular to the rotation centerline of the wind turbine body 200. Under this design, the other side of the plate 2 is staggered with the main airfoil blade 1, so that a second air passage 202 with a larger air inlet can be formed between the plate 2 and the main airfoil blade 1.

[0061] In the present application, a certain distance needs to be ensured between one end of the plate 2 and the trailing edge of the aileron blade 3. If the distance between the plate 2 and the trailing edge of the aileron blade 3 is too short (e.g. Figure 8 As shown, one side of the plate 2 extends onto the aileron blade 3 and is directly connected to the trailing edge of the aileron blade 3 (as shown in FIG. Fig. 9 As shown in the figure), the mean torque coefficient is obtained by CFD calculation:

[0062] The average value of the torque coefficient under the condition where the distance between the plate 2 and the trailing edge of the aileron blade 3 is too short is less than 0.020;

[0063] The mean value of the torque coefficient under the condition where the edge of the plate 2 is directly connected to the trailing edge of the aileron blade 3 is 0.176;

[0064] The torque custom mean of the solution designed in this application is 0.192;

[0065] It can be found that when the distance between the trailing edge of the plate 2 and the aileron blade 3 is too short, or the trailing edge of the plate 2 and the aileron blade 3 are directly connected, the calculated average torque coefficient is smaller than the settlement result of the working condition designed for the present application, and even there are problems of unstable rotation and irregular torque output, which is not conducive to improving the power generation efficiency of the wind turbine (the higher the average torque coefficient of the wind turbine under the same working conditions, the higher the power generation efficiency of the wind turbine).

[0066] The double-layer airfoil vertical axis wind turbine designed in the present application is newly designed with a plate 2 on the basis of the design of the main airfoil blade 1 and the aileron blade 3, and the plate 2 is placed at a certain distance from the trailing edge of the aileron blade 3, and a second air passage 202 is formed between the plate 2 and the main airfoil blade 1 to communicate with the first air passage 201 formed between the aileron blade 3 and the main airfoil blade 1. The newly added plate 2 can increase the airflow for squeezing the main airfoil blade 1, increase the squeezing effect on the lower surface 12 of the main airfoil blade 1, and help weaken the blade tip vortex generated on the lower surface of the main airfoil blade, thereby further increasing the pressure difference between the upper surface 11 and the lower surface 12 of the main airfoil blade 1, and then increase the lift force on the main airfoil blade 1, so as to further improve the self-starting performance and power generation efficiency of the wind turbine.

[0067] The above is a first embodiment of a double-layer airfoil vertical axis wind turbine provided by the embodiment of the present application. The following is a second embodiment of a double-layer airfoil vertical axis wind turbine provided by the embodiment of the present application. For details, please refer to Figures 1 to 9 .

[0068] Based on the solution of the above embodiment 1:

[0069] Furthermore, the aileron blade 3 can be set with an adjustable rotation angle. Under this design, the rotation angle of the aileron blade 3 can be adjusted as needed, and the adaptability is better. The specific method of setting the adjustable rotation angle can be that the aileron blade 3 is first rotated around a fixed axis, and a plurality of screw holes are provided on the aileron blade 3 around the fixed axis, and the angle between adjacent screw holes is a set adjustment degree. The wind turbine body 200 for fixing the aileron blade 3 is provided with a through hole for the screw to pass through and can cooperate with each screw hole. The aileron blade 3 is rotated until the corresponding screw hole is aligned with the through hole, and then the screw is passed through the through hole and screwed into the screw hole, so that the aileron blade 3 can be fixed and the rotation angle adjustment can be completed.

[0070] Furthermore, the plate 2 can also be designed to have an adjustable rotation angle setting. Under this design, the rotation angle of the plate 2 can be adjusted as needed, which has better adaptability. The specific rotation angle adjustment setting method of the plate 2 can refer to the design of the above-mentioned aileron blade 3, and will not be repeated.

[0071] Furthermore, if Figure 1 as well as Figure 4 As shown, the structural design of the wind turbine body 200 includes a base 5 , a rotating shaft 4 and a rotating frame 6 .

[0072] The rotating shaft 4 is mounted on the base 5, the rotating frame 6 is mounted on the rotating shaft 4 and can rotate freely around the rotating shaft 4, and at least two airfoil blade groups 100 are mounted on the rotating frame 6 and are evenly distributed around the circumference of the rotating shaft 4. The overall structural layout is equivalent to the main structure of the existing straight blade H-shaped wind turbine, so it will not be described in detail.

[0073] Furthermore, if Figure 4 As shown, the rotating frame 6 includes an upper connecting member 62, a lower connecting member 64 and at least two beams.

[0074] The upper connecting member 62 and the lower connecting member 64 are rotatably mounted on the rotating shaft 4 and are arranged up and down. The upper connecting member 62 and the lower connecting member 64 are both flange connecting members, and no specific limitation is made.

[0075] At least two beams are connected to the upper connecting member 62 and the lower connecting member 64 and are evenly distributed around the circumference of the rotating shaft 4 for one-to-one correspondence with the fixed airfoil blade assembly 100 .

[0076] Each beam frame includes an upper beam 61 and a lower beam 63 ; the upper beam 61 is fixedly connected to the upper connecting member 62 ; the lower beam 63 is fixedly connected to the lower connecting member 64 ; and the airfoil blade assembly 100 is fixed between the upper beam 61 and the lower beam 63 .

[0077] Furthermore, if Figure 4As shown, the cross-sections of the upper beam 61 and the lower beam 63 are elliptical. It can be understood that the upper beam 61 and the lower beam 63 also adopt an airfoil-like blade design. Under this design, the lift effect of the beam frame can be increased, thereby reducing the pressure applied by the beam frame to the base 5, reducing friction force, reducing friction loss, and extending service life.

[0078] Furthermore, if Figure 4 as well as Figure 6 As shown, a main wing fixing column 71 is fixed to the bottom of the upper beam 61 and the bottom of the lower beam 63 , and the main airfoil blade 1 is fixed between the upper main wing fixing column 71 and the lower main wing fixing column 71 .

[0079] Furthermore, taking the staggered setting of the aileron blade 3 relative to the main aileron blade 1 as an example, the aileron fixing bracket 73 can be connected to both the upper beam 61 side and the lower beam 63 side. The shape of the aileron fixing bracket 73 can be a square block, without specific limitation.

[0080] Aileron fixing columns 72 are fixed to the bottom of the upper aileron fixing bracket 73 and the top of the lower aileron fixing bracket 73 , and the aileron blade 3 is correspondingly fixed between the upper aileron fixing column 72 and the lower aileron fixing column 72 .

[0081] The other side of the upper beam 61 and the other side of the lower beam 63 are both connected with a plate fixing bracket 74, and the plate 2 is fixed between the upper plate fixing bracket 74 and the lower plate fixing bracket 74. The plate fixing bracket 74 can be a trapezoidal block structure, which has an inclined surface, and can be installed in contact with the plate 2 to achieve the inclined setting of the plate 2. At the same time, since the thickness of the plate 2 is relatively small, the installation method of using surface contact and then fastening with fasteners such as screws is also more convenient and reliable.

[0082] Through CFD calculation, the torque generated by each wind turbine blade can be monitored, and the performance of the wind turbine can be evaluated using parameters such as torque and torque coefficient.

[0083] Taking the traditional straight blade H-shaped wind turbine / traditional double-layer airfoil wind turbine as a comparison, the following can be obtained through calculation: Figure 7 The torque monitoring curve graph is shown.

[0084] from Figure 7 It can be seen that compared with the traditional structure, the double-layer airfoil + plate 2 design of the present application produces a larger torque peak in the upwind area and a smaller torque in the downwind area; at the same time, the torque output of the design of the present application in the downwind area is more stable, which is a significant improvement over the traditional straight-blade H-shaped wind turbine.

[0085] The torque coefficient is between 0 and 1, which indicates the ratio of the torque per unit area of ​​the blade at unit wind speed to the theoretical maximum torque. A higher torque coefficient means that the wind turbine can generate more torque at a given wind speed and has higher performance. Therefore, the torque coefficient is one of the key factors in the performance evaluation of wind turbines. In CFD calculations, the blade torque coefficient output after the wind turbine rotates stably can be used to obtain the average torque coefficient of the vertical axis wind turbine. Through calculation, it is found that the torque coefficient of the design scheme is about 2.3% higher than the average torque coefficient of the traditional straight-blade H-shaped wind turbine (the average torque coefficient of the traditional straight-blade H-shaped wind turbine is 0.188). It can be seen that the torque output advantage of the design scheme in this application.

[0086] The above is a detailed introduction to a double-layer airfoil vertical axis wind turbine provided by the present application. For a person skilled in the art, according to the idea of ​​the embodiments of the present application, there may be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A double-layer airfoil vertical axis wind turbine, characterized in that: It comprises a wind turbine body (200) and at least two airfoil blade assemblies (100); At least two of the airfoil blade assemblies (100) are mounted on the wind turbine body (200) and are evenly distributed around the circumference of the rotation centerline of the wind turbine body (200); Each of the aerofoil blade groups (100) comprises a main aerofoil blade (1), an auxiliary aerofoil blade (3) and a plate (2); The aileron-shaped blade (3) is arranged on a side of the main aileron-shaped blade (1) closer to the rotation centerline of the wind turbine body (200), and forms a first wind passage (201) between the aileron-shaped blade (3) and the main aileron-shaped blade (1); The plate (2) is arranged on a side of the main airfoil blade (1) closer to the rotation centerline of the wind turbine body (200), and forms a second air passage (202) communicating with the first air passage (201) between the plate and the main airfoil blade (1); There is a gap space between one side edge of the plate (2) and the trailing edge of the aileron-shaped blade (3); The auxiliary airfoil blade (3) is arranged parallel to the main airfoil blade (1) and is staggered with respect to the main airfoil blade (1); The other side edge of the plate (2) is arranged closer to the main airfoil blade (1) than one side edge of the plate (2), so that the plate (2) is arranged at an inclination relative to the main airfoil blade (1).

2. A double-layer airfoil vertical axis wind turbine according to claim 1, characterized in that: The aileron-shaped blade (3) can be set at an adjustable rotation angle.

3. A double-layer airfoil vertical axis wind turbine according to claim 1, characterized in that: The plate (2) can be set at an adjustable rotation angle.

4. A double-layer airfoil vertical axis wind turbine according to claim 1, characterized in that: The wind turbine body (200) comprises a base (5), a rotating shaft (4) and a rotating frame (6); The rotating shaft (4) is mounted on the base (5); The rotating frame (6) is mounted on the rotating shaft (4) and is capable of freely rotating around the rotating shaft (4); At least two of the airfoil blade assemblies (100) are mounted on the rotating frame (6) and are evenly distributed around the circumference of the rotating shaft (4).

5. A double-layer airfoil vertical axis wind turbine according to claim 4, characterized in that: The rotating frame (6) comprises an upper connecting member (62), a lower connecting member (64) and at least two beam frames; The upper connecting member (62) and the lower connecting member (64) are rotatably mounted on the rotating shaft (4) and are arranged up and down; At least two of the beam frames are connected to the upper connecting member (62) and the lower connecting member (64), and are evenly distributed around the circumference of the rotating shaft (4), and are used to fix the airfoil blade groups (100) in a one-to-one correspondence; Each of the beam frames comprises an upper beam rod (61) and a lower beam rod (63); The upper beam (61) is fixedly connected to the upper connecting member (62); The lower beam (63) is fixedly connected to the lower connecting member (64); The airfoil blade assembly (100) is fixed between the upper beam (61) and the lower beam (63).

6. A double-layer airfoil vertical axis wind turbine according to claim 5, characterized in that: The cross-sections of the upper beam (61) and the lower beam (63) are elliptical.

7. A double-layer airfoil vertical axis wind turbine according to claim 5, characterized in that: A main wing fixing column (71) is fixed to the bottom of the upper beam (61) and the bottom of the lower beam (63); The main wing blade (1) is fixed between the main wing fixing column (71) located above and the main wing fixing column (71) located below.

8. A double-layer airfoil vertical axis wind turbine according to claim 7, characterized in that: One side of the upper beam (61) and one side of the lower beam (63) are both connected to an aileron fixing bracket (73); An aileron fixing column (72) is fixed to the bottom of the aileron fixing bracket (73) located above and the top of the aileron fixing bracket (73) located below; The aileron-shaped blade (3) is fixed between the aileron fixing column (72) located above and the aileron fixing column (72) located below; The other side of the upper beam (61) and the other side of the lower beam (63) are both connected to a plate fixing bracket (74); The plate (2) is fixed between the plate fixing bracket (74) located above and the plate fixing bracket (74) located below.

Images