Vertical axis wind turbine with barycentric stabilization function

Abstract

The utility model discloses a vertical axis wind driven generator with gravity center stable function, including rotating main shaft, wind blade support arm and wind blade, the wind blade is assembled on rotating main shaft through wind blade support arm, rotating main shaft transmission connection to generator unit, its characterized in that: still include the function strip for wind blade counterweight and / or wind blade reinforcing, the function strip is along the horizontal direction and is wrapped wind blade's outer surface, the function strip includes several roots along the wind blade height direction distribution on the wind blade surface, can optimize the structure of wind blade in current vertical axis wind driven generator, to satisfy the demand of energy conversion efficiency.

Description

Technical Field

[0001] This utility model relates to the field of wind power generation equipment, specifically to a vertical axis wind turbine generator with a center of gravity stabilization function. Background Technology

[0002] Vertical axis wind turbines (VAWTs) can be mainly classified into drag type and lift type. Drag type VAWTs mainly use the drag generated by air flowing over the blades as the driving force, while lift type VAWTs use the lift generated by air flowing over the blades as the driving force.

[0003] Drag-type vertical axis wind turbines primarily rely on the resistance of the wind on the blade surface to drive rotation, with the Savonius type being a representative structure. Their working principle is that when the wind blows, the concave surface of the blades experiences greater wind resistance than the convex surface, creating a torque difference that drives the rotor to rotate.

[0004] The characteristics of drag-type vertical axis wind turbines include:

[0005] Low speed: Because it relies on wind resistance for driving, the speed is relatively low.

[0006] High starting torque: It can generate a large torque even at low wind speeds, making it easy to start.

[0007] Inefficient: Overall efficiency is low, but it can work under complex wind conditions.

[0008] The structural features of drag-type vertical axis wind turbines include that the blades are mounted on the rotating main shaft via cantilever beam-type blade supports. During operation, wind power is used to drive the rotating main shaft to rotate, and the power is input to the generator and converted into electricity.

[0009] Currently, drag-type vertical axis wind turbines face numerous challenges in optimization. For instance, the manufacturing cost of the blades is high, and the heavy blades suffer from dynamic response lag and low energy conversion efficiency. Existing lightweight solutions, while reducing blade weight, suffer from poor blade quality due to limitations in blade structure and production conditions. This results in inconsistent blade wall thickness, discrepancies between the blade's mass distribution and the design, leading to a shift in the blade's center of gravity and exacerbated blade flutter after application. Furthermore, the blade flutter is transmitted to the main shaft through the blade support, resulting in a harsh operating environment for the entire equipment and making it difficult to achieve the preset energy conversion efficiency.

[0010] Therefore, to solve the above problems, a vertical axis wind turbine with a center of gravity stabilization function is needed, which can optimize the structure of the blades in the current vertical axis wind turbine to meet the requirements of energy conversion efficiency. Utility Model Content

[0011] In view of this, the purpose of this utility model is to overcome the defects in the prior art and provide a vertical axis wind turbine with a center of gravity stabilization function, which can optimize the structure of the current drag-type vertical axis wind turbine to meet the requirements of energy conversion efficiency.

[0012] The present invention relates to a vertical axis wind turbine with a center of gravity stabilization function, comprising a rotating main shaft, a blade support arm, and a blade. The blade is mounted on the rotating main shaft via the blade support arm, and the rotating main shaft is driven to the generator set. It also includes functional strips for blade counterweight and / or blade reinforcement. The functional strips wrap around the outer surface of the blade in a horizontal direction, and the functional strips include several strips distributed on the surface of the blade along the height direction of the blade.

[0013] Furthermore, the fan blade has a receiving groove for accommodating the functional strip, which is embedded in the receiving groove and fixed to the fan blade.

[0014] Furthermore, the receiving groove extends across the outer surface of the wind blade along the unfolding direction of the wind blade, and the outer surface of the functional strip smoothly transitions with the outer surface of the wind blade.

[0015] Furthermore, several functional strips are evenly spaced along the height direction of the wind turbine blades.

[0016] Furthermore, the material density of the functional strip is greater than that of the wind turbine blade.

[0017] Furthermore, the fan blade is provided with a support portion for assembling the fan blade support arm, the support portion being located on the inner side of the functional bar, so that when in use, the fan blade support arm provides support for the functional bar.

[0018] Furthermore, the functional bar has an assembly end that passes through the fan blade and extends out of the support portion, and the assembly end is provided with fasteners; in use, the fan blade support arm is set at the assembly end by the fasteners and is supported by the support portion.

[0019] Furthermore, the support portion consists of several units arranged along the length of the functional strip on the fan blade.

[0020] Furthermore, the surface curvature of the functional strip is continuous with the surface curvature of the fan blade, and the height difference does not exceed 1 mm.

[0021] Furthermore, the wind blade includes a wind blade body, with the upper and lower ends of the wind blade body extending outward to form an upper folding wing and a lower folding wing, respectively; functional strips are provided on the wind blade body.

[0022] The beneficial effects of this utility model are as follows: This utility model discloses a vertical axis wind turbine with a center of gravity stabilization function. By setting several functional strips on the wind blades, it can meet the purpose of adjusting the mass distribution of the wind blades. The functional strips are also used to improve the structural strength of the wind blades, so as to ensure the reliability of the wind blades and overcome the risk of peeling between the wind blade layers, making it easier for the energy conversion rate of the equipment to meet the preset requirements. Attached Figure Description

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0024] Figure 1 This is a schematic diagram of one possible structure of the present utility model;

[0025] Figure 2 This utility model Figure 1 Front view structural diagram;

[0026] Figure 3 This utility model Figure 1 A top-view structural diagram;

[0027] Figure 4 This is a schematic diagram of another structure of the present invention;

[0028] Figure 5 This utility model Figure 4 Front view structural diagram;

[0029] Figure 6 This utility model Figure 4 A top-view structural diagram;

[0030] Figure 7 This is a schematic diagram of the assembly of the bushing and one of the fan blade support arms of this utility model.

[0031] Figure 8 This utility model Figure 7 A schematic diagram of the side view structure;

[0032] Figure 9 This utility model Figure 1 Schematic diagram of the cross-sectional structure at point A in the middle;

[0033] Figure 10 This is a schematic diagram of the structure of the support of this utility model;

[0034] Figure 11 This utility model Figure 10 A schematic diagram of the structure after removing the protective shell;

[0035] Figure 12 This utility model Figure 10 A top-view structural diagram;

[0036] Figure 13 This utility model Figure 10 A schematic diagram of the structure viewed from below;

[0037] Figure 14 This utility model Figure 12 A schematic diagram of the AA-direction structure;

[0038] Figure 15 This utility model Figure 12 Schematic diagram of the BB-oriented structure;

[0039] Figure 16 This is a schematic diagram of the cross-sectional structure of the protective shell of this utility model on the supporting frame;

[0040] Figure 17 This is a schematic diagram of the structure of bracket III being hoisted onto bracket I according to this utility model;

[0041] Figure 18 This is a structural schematic diagram of one embodiment of the fan blade of this utility model (without function bars);

[0042] Figure 19 This utility model Figure 18 A schematic diagram of the side view structure;

[0043] Figure 20 This utility model Figure 18 A top-view structural diagram;

[0044] Figure 21 This is a structural schematic diagram of the third embodiment of the fan blade of this utility model (without function bars);

[0045] Figure 22 This utility model Figure 21 A schematic diagram of the side view structure;

[0046] Figure 23 This utility model Figure 21 A top-view structural diagram;

[0047] Figure 24 This is a schematic diagram of the wind kinetic energy testing structure of this utility model;

[0048] Figure 25 Torque comparison of the fan blades of this utility model Figure 1 ;

[0049] Figure 26 Torque comparison of the fan blades of this utility model Figure 2 . Detailed Implementation

[0050] As shown in the figure Figures 1-3This is a schematic diagram of the structure of the first vertical axis wind turbine of this utility model. Its blade structure includes a blade body 101 and an upper folding blade 102 and a lower folding blade 103 connected to both ends of the blade body 101 by a transition curved surface 1001. Functional strips 9 are provided on the blade body 101. Figures 4-6 This is a schematic diagram of the structure of the second type of vertical axis wind turbine of this utility model. Its blade structure only includes the blade body 101, and the functional strip 9 is set on the blade body 101. The vertical axis wind turbine in this embodiment is described with the first type as an example. The second type is similar to it, except that the structure of the blade 001 is different, which will not be described again here.

[0051] This solution features a vertical axis wind turbine with a stable center of gravity, comprising a rotating main shaft 003, a blade support arm, blades 001, and a generator set. The blades 001 are mounted on the rotating main shaft 003 via the blade support arm, and the rotating main shaft 003 is drive-connected to the generator set. The generator set of the vertical axis generator converts captured wind energy into electrical energy through the blades 001 mounted on the rotating main shaft 003, and then uses the electrical energy for grid connection via an inverter. Alternatively, the generator set of the vertical axis generator converts captured wind energy into electrical energy through the blades 001 mounted on the rotating main shaft 003, the electrical energy is transmitted to an energy storage device, and then used by electrical equipment or connected to the grid via an inverter. This solution selects any of the above-mentioned existing methods according to the application scenario. Of course, the vertical axis wind turbine also includes electrically connected information collection, control, and information processing systems, such as anemometers, speed sensors, vibration monitors, frequency converters, and PLC controllers, which facilitate the purpose of converting wind energy into electrical energy for use in this solution; these will not be elaborated further here.

[0052] In this embodiment, several functional strips 9 are also included for counterweighting and / or reinforcing the wind turbine blades. Each functional strip 9 wraps around the surface of the wind turbine blades in the horizontal direction, and the several functional strips are arranged side by side in the height direction. Counterweighting means adding functional strips to the wind turbine blades to compensate for the unevenness of the original mass distribution of the wind turbine blades. Reinforcing means adding functional strips with supporting or structural strengthening capabilities to the wind turbine blades to meet the vibration resistance requirements of the wind turbine blades and make up for the defects of the wind turbine blades. This ensures the stability of the center of gravity of the vertical axis wind turbine. The meaning of "and / or" is that the functional strips 9 may only have the function of counterweighting the wind turbine blades or reinforcing the wind turbine blade structure, or the functional strips 9 may have both the function of counterweighting the wind turbine blades or reinforcing the wind turbine blade structure. The appropriate selection should be made according to the usage environment to achieve the purpose of stabilizing the center of gravity of the vertical axis wind turbine. This will not be elaborated further here. Of course, the functional strip 9 can not only cover the outer surface of the wind blade, but also cover the inner surface of the wind blade or surround the wind blade 001, etc., which will not be elaborated here. The arrangement of the functional strip 9 on the wind blade 001 can meet the purpose of adjusting the mass distribution of the wind blade, and the functional strip can also be used to improve the structural strength of the wind blade, so as to ensure the reliability of the wind blade and overcome the risk of peeling between the wind blade layers.

[0053] The arrangement of several functional bars 9 on the wind blade 001 can coordinate with each other to adjust the mass distribution of the wind blade 001 and ensure the overall structural strength of the wind blade 001. This makes it easier to achieve the preset mass distribution of the wind blade 001, reduce the frequency of flutter after the wind blade 001 is applied to the vertical axis wind turbine, stabilize the center of gravity of the vertical axis wind turbine, and make it easier for the energy conversion rate of the equipment to meet the preset requirements.

[0054] In this embodiment, several functional strips 9 are evenly spaced along the height direction of the blade 001. This equidistant arrangement of the functional strips 9 creates a periodic stiffness-enhancing area, reducing the risk of resonance and ensuring the stability of the equipment's center of gravity. Furthermore, the functional strips 9 bring the center of gravity of the blade 001 closer to its lower center, improving wind resistance and extending the fatigue life of the blade 001, blade support arm 002, and rotating main shaft 003. Of course, depending on the specific vertical axis wind turbine, the functional strips 9 may not be evenly spaced; they can be concentrated in the middle or lower part of the blade 001 to allow for adjustment of the blade's center of gravity to a preset position or area. Further details will not be elaborated here.

[0055] In this embodiment, the material density of functional strip 9 is greater than that of the main body material of wind blade 001. When used as a counterweight, it is used to adjust the mass distribution of the wind blade to increase the moment of inertia. When used as reinforcement, it is used to improve the vibration resistance of the wind blade and specifically improve the anti-interference ability of wind blade 001 during operation. Compared with the overall increase in weight of wind blade 001, this solution has the advantage of being lighter. The mass distribution of wind blade 001 is adjusted by functional strip 9, which allows for the selection of lighter materials or materials that are more conducive to adjusting the mass distribution of wind blade 001, reducing the manufacturing difficulty of wind blade 001, making the center of gravity control of wind blade 001 better, thereby ensuring the yield and quality of wind blade 001, and solving the problem of poor product quality of wind blade 001. Furthermore, the use of functional strip 9 can also make the mass distribution of wind blade 001 closer to or completely consistent with the design value, resulting in better structural stability. This reduces the negative impact of wind blade 001 after being applied to vertical axis wind turbines, making it easier for the energy conversion rate of vertical axis wind turbines to meet the preset requirements.

[0056] In this embodiment, during use, the top of the rotating main shaft 003 is located at the bottom of the top of the blade 001; more specifically, the top of the rotating main shaft 003 is located at the upper middle part of the blade 001 along the height direction of the blade 001; this can minimize the length of the rotating main shaft 003, reduce the load, and keep the center of gravity of the vertical axis wind turbine downward, thereby reducing the sway amplitude of the blade 001, improving wind resistance, and helping to improve the energy conversion rate of the vertical axis wind turbine.

[0057] In this embodiment, the fan blade 001 has a receiving groove for accommodating the functional strip 9. The functional strip 9 is embedded into the receiving groove and fixed to the fan blade 001. The surface of the functional strip 9 smoothly transitions with the surface of the fan blade 001. More specifically, the surface curvature of the functional strip 9 is continuous with the surface curvature of the fan blade 001, and the height difference does not exceed 1mm. The wrapping structure of the functional strip 9, combined with the way the functional strip 9 is embedded into the fan blade 001, enables the two to be stably connected, reduces the risk of detachment, and reliably improves the structural strength of the fan blade 001. The receiving groove also forms a limit for the functional strip 9, making the assembly of the functional strip 9 on the fan blade 001 simpler and more convenient. The setting method of the functional strip 9 on the fan blade 001 includes a mortise and tenon type embedding structure, an adhesive embedding structure, or a structure fixed by a limiting method such as screws, which is preferable to meet the purpose of fixing the functional strip 9 into the fan blade 001. It will not be described in detail here.

[0058] In this embodiment, the receiving groove runs transversely across the outer surface of the fan blade 001 along the unfolding direction of the fan blade 001. The unfolding direction of the fan blade 001 is the width direction of the fan blade 001. The functional strip 9 is embedded in the receiving groove and fixed to the outside of the fan blade 001. The outer surface of the functional strip 9 and the outer surface of the fan blade 001 are smoothly transitioned, which is more aesthetically pleasing and makes it easier to obtain the structure of the fan blade 001, reducing the manufacturing difficulty of the fan blade 001 and the assembly difficulty of the functional strip on the fan blade.

[0059] In this embodiment, the wind blade is provided with a support portion 10 for assembling wind blade support arms. The support portion 10 is located on the inner side of the functional strip 9, so that when in use, the wind blade support arms 002 support the functional strip 9. The support portion 10 consists of several parts arranged along the length of the functional strip on the wind blade. Specifically, when this solution is applied in a vertical axis wind turbine, the wind blade support arms 002 are located on the inner side of the wind blade 001 and supported on the functional strip 9. Several wind blade support arms 002 supported on the same functional strip 9 form a support arm group. The number of support arm groups corresponds to the number of functional strips 9 on a single wind blade 001, and in use, the functional strips 9 are supported in a one-to-one correspondence. In this design, the functional bar 9 and the corresponding support arm group forming an inner and outer clamping structure for the wind blade 001 can further improve the connection reliability between the wind blade 001 and the wind blade support arm 002, thereby further reducing the transmission of wind blade flutter to the rotating main shaft 003 and improving the energy conversion rate of the vertical axis wind turbine.

[0060] In this embodiment, the wind turbine support arm 002 has an external connection end 8 connected to the wind turbine 001. The external connection ends 8 of several wind turbine support arms 002 in a set of support arms are correspondingly connected to the functional bar 9. The support part 10 located on the inner surface of the wind turbine 001 is used to assemble the external connection end 8. The functional bar 9 has an assembly end 11 that passes through the wind turbine 001 and extends out of the support part 10. The external connection end 8 is set on the assembly end 11 by fasteners 12 and is supported by the support part 10. The functional bar 9 is assembled with the external connection end 8 of the wind turbine support arm 002 through the assembly end 11 that passes through the wind turbine 001, forming a tight clamping of the wind turbine 001, improving the setting strength of the functional bar 9 on the wind turbine 001, and ensuring the setting strength of the wind turbine 001 on the wind turbine support arm 002, thereby improving the wind energy capture efficiency and improving the energy conversion rate of the vertical axis wind turbine.

[0061] In this embodiment, a bushing 13, which is fitted over the assembly end 11, is provided between the support part 10 and the functional strip 9 to further strengthen the structure. Specifically, the assembly end 11 is a screw formed inside the functional strip 9, and the fastener 12 is a nut that is threadedly connected to the screw, which has the advantages of high assembly efficiency and stable and reliable connection nodes. In this solution, the support part 10 is located on the inner surface of the fan blade 001, making the assembly of the outer connecting end 8 on the support part 10 more reliable. The number of support parts 10 is the same as the number of outer connecting ends 8, and they support the outer connecting ends 8 in a one-to-one correspondence during use. In this solution, the support part 10 has a hollow cover structure that is fastened and fixed to the inner surface of the fan blade 001, and the support part 10 is located on the inner side of the functional strip 9. During assembly, the screw passes through the fan blade 001 and the corresponding support part 10. The outer connecting end 8 of the fan blade support arm 002 is provided with a through hole so that the screw passes through the through hole and the nut fastens the outer connecting end 8 to the support part 10. The screw is also fitted with a bushing 13 located in the hollow cavity of the cover structure. The bushing 13 serves a protective function and supports the inner surface of the fan blade 001 and the inner surface of the hollow cavity of the support part 10, which is conducive to the fixation of the outer connecting end 8 and the fastener 12. Of course, the support part 10 can also be formed on the functional strip 9 and together with the assembly end 11 pass through the fan blade 001 and the fan blade support arm 002 to connect and perform the corresponding installation and support functions, which will not be described in detail here.

[0062] In this embodiment, a set of booms in the vertical axis wind turbine is mounted on the rotating main shaft 003 via the same bushing 1, and each blade boom 002 corresponds to the central axis perpendicular to the rotating main shaft 003; the bushing 1 is coaxial with the rotating main shaft 003 and is connected to the rotating main shaft 003 in a ring; on the same cross section, the cross section is the surface perpendicular to the axial direction of the rotating main shaft 003, and the outer diameter of the bushing 1 is larger than the outer diameter of the rotating main shaft 003.

[0063] The blade 001 is mounted on the rotating main shaft 003 by several blade support arms 002 located radially on the bushing 1. This enhances the structural strength of the area where the rotating main shaft 003 is assembled with the blade support arms 002, thereby improving the reliability of the connection between the rotating main shaft 003 and the blade support arms 002. By using the bushing 1 on the rotating main shaft 003, the radial dimension of the rotating main shaft 003 can be increased in a predetermined area, improving its rigidity and torsional resistance. This overcomes the problems of insufficient rigidity, poor bending and torsional resistance, and easy vibration or deformation that can occur with small shaft diameters, indirectly affecting the dynamic stability of the center of gravity. While ensuring the usability of the rotating main shaft, the radial dimension of the rotating main shaft can be reduced, achieving the goal of lightweighting the power shaft assembly. This makes it easier to deploy the vertical axis wind turbine as an emergency device. Furthermore, compared to directly increasing the shaft diameter, this method can improve the service life of the equipment under environmental conditions such as vibration.

[0064] The bushing 1 also provides a larger installation area for the blade support arm 002. After the blade support arm 002 is installed on the bushing 1, it overcomes the problem that the installation position of the support arm assembly on the rotating main shaft 003 is insufficient, which leads to the concentrated overlap of the blade support arm 002 and is prone to fatigue cracking or breakage at the overlap position, or even tearing of the rotating main shaft 003. At the same time, the increased shaft diameter in the preset area has virtually no impact on the center of gravity shift of the overall vertical axis wind turbine, and can also overcome the problem of dynamic instability of the center of gravity. That is, under the premise of keeping the rotating main shaft 003 with a small shaft diameter, the addition of the bushing 1 in the preset area of ​​the rotating main shaft 003 not only gives the rotating main shaft 003 good bending and torsional resistance, which is conducive to the assembly of the blade support arm 002, but also makes the center of gravity of the entire equipment stable. This facilitates the optimization of the blade 001 and the blade support arm 002, and makes it easier for the energy conversion rate of the vertical axis wind turbine to meet the preset requirements.

[0065] In this embodiment, the bushing 1 has a mounting surface 2 at a set angle to the side of the bushing; generally, the angle between the mounting surface 2 and the side of the bushing 1 is between 30° and 90°, so as to reduce the force exerted by the fan blade support arm 002 on the rotating main shaft 003; preferably, the mounting surface 2 is perpendicular to the side of the bushing 1, so as to reduce the force transmitted by the fan blade support arm 002 on the rotating main shaft 003, improve the structural reliability, and reduce fatigue damage at the connection between the bushing 1 and the fan blade support arm 002.

[0066] In this embodiment, the fan blade support arm 002 has an inner connecting end connected to the bushing 1. The inner connecting end includes a connecting part I3 connected to the mounting surface 2 and a connecting part II4 connected to the side of the bushing 1. The connecting part I3 and the connecting part II4 are axially separated from each other along the bushing 1 to reduce the force interference at the connection between the fan blade support arm 002 and the bushing 1. At the same time, they also increase the structural stability of the inner connecting end of the fan blade support arm 002 after it is installed on the bushing 1, which is more conducive to the structural optimization of the fan blade 001 installed on the fan blade support arm 002.

[0067] In this embodiment, connecting part I3 and connecting part II4 are located on the same longitudinal section, which is a plane parallel to the axial direction of bushing 1. This allows connecting part I3 and connecting part II4 to be positioned vertically relative to each other in the axial direction of bushing 1, which is more conducive to bearing the vertical downward tension transmitted by the fan blade 001, making the cantilever structure more stable and further reducing the inward transmission of fan blade flutter. Of course, connecting part I3 and connecting part II4 can also be arranged separately on different longitudinal sections, or the inner connecting end of the fan blade support arm 002 can also have connecting part III. Connecting part I3, connecting part II4 and connecting part III are arranged in a triangular distribution, which can all improve the connection strength of the fan blade support arm 002 on the rotating main shaft 003 through bushing 1. This will not be elaborated further here.

[0068] In this embodiment, it also includes a limiting member I that is perpendicular to the assembly surface 2 and limits the connecting part I3 to the bushing 1; and a limiting member II that is perpendicular to the side of the bushing 1 and limits the connecting part II4 to the bushing 1. In this solution, the limiting member I and the limiting member II are bolts (not shown in the figure) through which the connecting part I3 and the connecting part II4 pass, respectively. The bolts are assembled perpendicularly to the corresponding surfaces, which can ensure the reliability of the structure.

[0069] In this embodiment, the limiting members I of the mounting connection part I3 are at least two arranged side by side in a direction perpendicular to the axial direction of the bushing 1, and the limiting members II of the mounting connection part II4 are at least two arranged side by side in the axial direction of the bushing 1, so as to improve the connection reliability between the fan blade support arm 002 and the bushing 1 and reduce the risk of fatigue damage. This structure enables the cantilever structure formed on the rotating main shaft 003 by the fan blade support arm 002 to generate a downward tensile force at the limiting member I position and an upward supporting force at the limiting member II position, which can further ensure the assembly reliability of the fan blade 001 on the rotating main shaft 003 through the fan blade support arm 002 and reduce the risk of stress damage to the fixed end of the cantilever structure.

[0070] In this embodiment, the bushing 1 also has a protective part 5 that protrudes radially from the side of the bushing 1. The protective part 5 is used to shield and protect the bearing position at the bottom of the rotating main shaft 003, thereby protecting the bearing, reducing the occurrence of jamming and other situations caused by the external environment, ensuring the rotational stability of the rotating main shaft 003, and improving the service life of the vertical axis wind turbine.

[0071] In this embodiment, the protective part 5 protrudes radially outward from the top end of the side of the bushing 1, and the top surface of the protective part 5 is flush with the top surface of the bushing 1; the flush top surface of the protective part 5 and the top surface of the bushing 1 serve as the assembly surface 2 for the connection part I 3 to be assembled. Figure 7 and Figure 8 As shown, the bushing 1 has an overall structure in the form of a stepped shaft with a large diameter at the top and a small diameter at the bottom. The assembly surface 2 is perpendicular to the side of the bushing 1. The limiting parts I and II corresponding to the assembly connection part I3 and connection part II4 are also perpendicular to each other. The extension direction of the limiting part I is parallel to the axial direction of the bushing 1, and the extension direction of the limiting part II is perpendicular to the axial direction of the bushing 1. The limiting part II passes through the connection part II4 and then through the bushing 1 to connect to the rotating main shaft 003, so that the fan blade support arm 002, the bushing 1 and the rotating main shaft 003 are connected, resulting in better overall integrity and a simpler structure.

[0072] In this embodiment, the fan blade support arm 002 also has a supporting portion 6, which has a supporting surface parallel to the side of the protective portion 5; such as Figure 7 and Figure 8As shown, in this design, the abutting surface of the supporting part 6 is parallel to the axial direction of the bushing 1, and the side of the protective part 5 has a plane that fits against the abutting surface, so that after the fan blade support arm 002 is fixed on the bushing 1, the abutting surface is supported by the corresponding side of the protective part 5. The abutting surface of the supporting part 6 being supported by the side of the protective part 5 can further improve the assembly reliability between the fan blade support arm 002 and the bushing 1, as well as the structural reliability of the equipment during use, and reduce the flutter of the fan blade 001. Of course, the structural forms of the abutting surface and the side of the protective part 5 also include arc surface abutting or inclined surface abutting, etc., so as to realize the function of the abutting surface being supported by the corresponding side of the protective part 5 after the fan blade support arm 002 is fixed on the bushing 1. These will not be elaborated here.

[0073] In this embodiment, a functional hole 7 is provided on the fan blade support arm 002. The functional hole 7 penetrates the plate surface of the fan blade support arm 002 and is located between the connecting part I3 and the connecting part II4. The front side of the functional hole 7 extends forward and is close to the middle of the length direction of the fan blade support arm 002, and the rear side of the functional hole 7 extends backward and penetrates the side wall of the fan blade support arm 002, so that the functional hole 7 on the fan blade support arm 002 is a strip-shaped hole that is roughly consistent with the length direction of the fan blade support arm 002. More specifically, the functional hole 7 is a triangle with the pointed corner facing forward, so that the inner connecting end of the fan blade support arm 002 and the bushing 1 form a... The triangular stable structure improves the reliability of the force, and the functional hole 7 also makes the rear side of the fan blade support arm 002 open towards the bushing 1. This opening allows the connecting part I3 and the connecting part II4 to be relatively independently separated at the inner connecting end of the fan blade support arm 002, reducing the interference between the two force-bearing positions, and reducing the mass of the fan blade support arm 002, which is conducive to improving the overall energy conversion efficiency of the equipment. The front is the direction from the middle of the fan blade support arm 002 towards the outer connecting end 8 of the fan blade support arm 002 in the extension direction of the fan blade support arm 002, and the rear is the opposite of the front direction, which will not be described in detail here.

[0074] In this embodiment, as Figure 7 and Figure 8 As shown, the fan blade support arm 002 is "r" shaped. The bottom end of the "r" shape serves as the outer connecting end 8 for connecting with the fan blade 001, and the top end of the "r" shape serves as the inner connecting end for connecting with the bushing 1. More specifically, the fan blade support arm 002 includes a support arm body that is long and plate-shaped corresponding to the vertical part of the "r" shape and a support arm split that is long and plate-shaped corresponding to the oblique insertion part of the "r" shape. The support arm body and the support arm split are manufactured as a single piece, directly forming the functional hole 7 located on the rear side of the fan blade support arm 002.

[0075] The top of the support arm body has a flange perpendicular to the bending of the support arm body. The outer connecting end 8 is formed by bending from the front end of the support arm body towards the middle of its own length direction. The supporting part 6 is formed by bending from the rear end of the support arm body towards the middle of its own length direction. The connecting part I3 of the inner connecting end is formed by extending the flange of the support arm body backward. The connecting part II4 of the inner connecting end is formed by bending from the rear end of the support arm split towards the middle of the length direction of the support arm body. The bending directions of the flange, the outer connecting end 8, the supporting part 6 and the connecting part II4 are the same. The supporting part 6 and the connecting part II4 are roughly parallel and perpendicular to the connecting part I3, which further ensures the structural strength of the support arm body.

[0076] In this embodiment, two opposing blades are arranged on the rotating main shaft 003 of the vertical axis wind turbine. The two blades are rotationally symmetrical about the central axis of the rotating main shaft 003. The two blades are respectively mounted on the same bushing 1 on the boom assembly at the same height, which reduces the use of bushing 1, achieves a lightweight effect, and also serves to enhance dynamic balance, so that the vertical axis wind turbine forms a stable force-bearing structure and extends its service life. The number of blades 001 is based on the design and is applied to different vertical axis wind turbines, which will not be elaborated here.

[0077] In this embodiment, the vertical axis wind turbine also includes a support, which includes a main shaft sleeve 14 coaxially fitted around the root of the rotating main shaft 003. The top end of the main shaft sleeve 14 extends into the space formed by the two blades and is close to the support arm assembly located below the rotating main shaft 003. This can enhance the local bending strength of the structure and reduce turbulent vibration at the root of the blades 001, resulting in better stability of the rotating main shaft 003. It also reduces the transmission of blade flutter to the support, thereby ensuring the energy conversion rate of the vertical axis wind turbine.

[0078] In this embodiment, the rotating spindle 003 and the spindle sleeve 14 are connected by a bearing. The inner ring of the bearing is connected to the rotating spindle 003, and the outer ring of the bearing is connected to the spindle sleeve 14. In this solution, the bearing at this position is preferably any type of square-spherical bearing suitable for this solution in the prior art, so as to improve the anti-overturning ability, distribute the radial load, reduce vibration transmission, and improve the structural stability. The spindle sleeve 14 serves as a load-bearing shell and forms a rotating pair with the rotating spindle 003 through the bearing. The inner ring of the bearing fixes the rotating spindle 003, and the outer ring fixes the spindle sleeve 14, realizing the dual functions of torque transmission and radial support, and further improving the rotational stability of the rotating spindle 003.

[0079] In this embodiment, a shielding cover 15 is provided on the top of the bearing to shield the bearing oil seal; a bushing 1 connecting the support arm assembly is provided on the top of the shielding cover 15 near the bottom of the rotating main shaft 003, and the peripheral dimension of the protective part 5 of the bushing 1 exceeds the peripheral dimension of the shielding cover 15; this further isolates the lubrication components from the external environment, reduces the intrusion of contaminants, and ensures the stable operation of the rotating pair.

[0080] In this embodiment, the support also includes a support frame that supports the spindle sleeve 14, and a protective shell 004 covering the outside of the support frame. The outer surface of the protective shell 004 is smooth. Specifically, the support frame supports the root of the spindle sleeve 14, and the protective shell 004 is located on the lower side of the rotating spindle 003 and covers the support frame. The protective shell 004 is a cone-shaped tube with a small top and a large bottom. The cone angle of the cone-shaped protective shell 004 is between 15° and 20°. In this design, it is 18°. The actual design shall prevail. This is to reduce wind resistance and reduce equipment vibration. It will not be described in detail here.

[0081] In this embodiment, the support frame includes several columns 16 evenly distributed radially around the axis of the main shaft sleeve 14. The tops of the columns 16 converge at the root of the main shaft sleeve 14, making the main body of the support frame approximately conical. This gives the multi-functional support better bending strength, and the radial load of the main shaft sleeve 14 can be evenly transmitted to the support frame, further suppressing the vibration of the multi-functional support, reducing the risk of resonance, and thus helping to ensure the energy conversion efficiency of the vertical axis wind turbine.

[0082] The conical protective shell 004, which consists of several columns 16 forming the outer supporting frame, has better wind load resistance. More specifically, the inner side of the protective shell has column support plates 17, which are several columns corresponding to the number of columns 16. The columns 16 and the column support plates 17 are connected in a one-to-one correspondence.

[0083] The support plate 17 is integrally formed with the protective shell to enhance the structural strength of the protective shell 004 and optimize its wind resistance.

[0084] By using the column support plate 17, which is integrally manufactured with the protective shell 004 and connected one-to-one with the column 16, the wind resistance of the multi-functional support can be further enhanced, and the structure is more compact. The local reinforcement of the protective shell 004 is different from the overall thickness reinforcement structure, which also helps to reduce the overall weight of the protective shell 004, making it easier to deploy when the vertical axis wind turbine is used as an emergency device.

[0085] In use, the protective shell 004 is fitted over the supporting frame, and the outer wall of each column 16 and the inner wall of each column abutment plate 17 are attached to each other. Each column 16 abuts the corresponding column abutment plate 17 to further ensure structural stability.

[0086] After the protective shell covers the support frame, the outer wall of each column 16 and the inner wall of the corresponding column abutment plate 17 are outwardly convex curved surfaces, so that the support frame also plays the role of positioning and limiting the protective shell 004, making the combination strength between the protective shell 004 and the support frame higher.

[0087] In this embodiment, the generator set is located inside the protective shell 004 and is set on the support frame. The bottom end of the support frame extends out of the protective shell 004 and is supported on a preset surface, so that there is a set gap between the protective shell 004 and the preset surface, which is conducive to the heat dissipation of the internal generator set.

[0088] The protective shell 004 also has a top cover 18 that covers the top of the support frame. The support frame also includes a mounting platform 19 for supporting the top cover 18. Several columns 16 are connected to the mounting platform 19, and the tops of adjacent columns 16 are connected by a crossbar 20, which is also connected to the mounting platform 19. This enhances the connection strength between the support frame and the spindle sleeve 14, improves structural stability, and helps ensure the rotational stability of the rotating spindle 003. In use, the protective shell 004 covers the support frame and is detachably connected to the support frame by bolts passing through the bottom of the mounting platform 19. The top cover 18 is used to make the connection between the protective shell 004 and the support frame better. The top cover 18 can also prevent the intrusion of wind, sand, rain or foreign objects, thus protecting the internal generator set.

[0089] In this embodiment, a reinforcing plate 21 is provided at one end of the column 16 near the mounting platform 19. The plane of the reinforcing plate 21 is parallel to the axis of the main shaft sleeve 14. The column 16 connects the main shaft sleeve 14 and the mounting platform 19 through the reinforcing plate 21, thereby improving the connection rigidity between the support frame and the main shaft sleeve 14, optimizing load transmission, suppressing the amplitude of the rotating main shaft 003, and making it easier for the energy conversion rate of the vertical axis wind turbine to reach the preset target value.

[0090] In this embodiment, the generator set includes an electromagnetic brake 005 and a generator 007 that are drive-connected to the rotating main shaft 003. The generator set also includes a reducer 006, which is located between the electromagnetic brake 005 and the generator 007, and drivesly connects the electromagnetic brake 005 and the generator 007 accordingly. The electromagnetic brake 005 is located in the support and is disposed below the rotating main shaft 003. The electromagnetic brake 005 works in conjunction with the reducer 006 and the generator 007 to control the rotational speed of the rotating main shaft 003. Specifically, the electromagnetic brake 005, the reducer 006, and the generator are arranged coaxially with the rotating main shaft 003 from top to bottom.

[0091] The rotating spindle 003 passes through the spindle sleeve 14 and is connected to the power input shaft of the electromagnetic brake 005 and reducer 006 via coupling I. The power output shaft of the reducer 006 is connected to the power input shaft of the generator 007 via coupling II. The power output end of the generator 007 is connected to a preset device according to the corresponding application environment. In this scheme, the electromagnetic brake 005, reducer 006 and generator 007 are selected from any existing technology that is suitable for this scheme, and it is advisable to meet the corresponding requirements. Further details are omitted here.

[0092] In this embodiment, the support also includes a bracket I22 for assembling the electromagnetic brake 005, a bracket II23 for assembling the generator 007, and a bracket III24 for assembling the reducer 006; the support frame connects the bracket I22 to the bracket II23, and the bracket III24 to the bracket I22.

[0093] Specifically, bracket I 22 is detachably mounted on the reinforcing plates 21 corresponding to several columns 16 by bolts. The bracket I has flanges corresponding to the bends of the reinforcing plates 21, which are detachably mounted on the corresponding reinforcing plates 21 by bolts. The bracket I 22 is located at the upper position of the support frame, forming a connection with several columns 16, which strengthens the support structure and makes the electromagnetic brake 005 mounted on the bracket I 22 more stable, further ensuring the operational reliability of the rotating spindle 003.

[0094] The bracket II23 is detachably mounted on several columns 16 by bolts. The bracket II23 is located at the lower position of the support frame, forming a connection with several columns 16, which strengthens the support structure and makes the generator mounted on the bracket II23 more stable, further ensuring the operational reliability of the rotating main shaft 003. The bracket II23 is plate-shaped, supporting the generator and closing the bottom of the support frame, reducing the impact of the external environment on the internal generator set. The plate-shaped bracket II23 has a flange connecting adjacent columns 16. This flange is formed by bending the periphery of the bracket II23 downward, which is used to ensure the stability of the bracket II23 on the support frame.

[0095] The bracket Ⅲ24 is detachably hoisted to the bottom of the bracket Ⅰ22 via the connecting rod 25. The reducer 006 is installed on the top of the bracket Ⅲ24, which improves the transmission reliability of the reducer 006 and the rotating main shaft 003. The bracket Ⅲ24 is designed to ensure that the axes of the rotating parts of the generator set are aligned, improve the operating stability of the rotating main shaft 003, and thus facilitate the improvement of the energy conversion rate of the vertical axis wind turbine.

[0096] This solution also discloses three wind turbine blade structures with upper folding blades 102 and lower folding blades 103, and one wind turbine blade structure with only a main body 101. In all four wind turbine blade structures, the main body 101 has the same structure. When applied to the vertical axis generator of this solution, only corresponding function bars need to be set on the main body 101, which will not be elaborated further here. Figures 1-3 The diagram shown is a structural schematic of the first type of vertical axis wind turbine of this utility model, which uses a third type of blade structure and has a functional strip 9 on it; as shown... Figures 4-6 This is a schematic diagram of the structure of the second type of vertical axis wind turbine of this utility model. Its blades only include the blade body 101, and the functional strips 9 are set on the blade body 101.

[0097] In this embodiment, in any wind blade structure with an upper folding 102 and a lower folding 103, the wind blade 001 includes a wind blade body 101, with the upper and lower ends of the wind blade body 101 extending outward to form an upper folding 102 and a lower folding 103, respectively. The upper folding 102 and lower folding 103 are used to reduce eddies at the tip of the wind blade, reduce energy loss, and give the wind blade good aerodynamic performance. This results in higher wind energy capture efficiency when the wind blade is applied to a vertical axis wind turbine, thereby increasing the energy conversion rate of the wind turbine. The upper folding 102 and lower folding 103 can be connected to the wind blade body 101 by welding, gluing, or integral molding to form a whole, which will not be elaborated further here.

[0098] In this embodiment, in any wind blade structure with upper folding 102 and lower folding 103, the upper folding 102 and lower folding 103 located at both ends of the wind blade are symmetrical with respect to the middle of the extension direction of the wind blade body 101, and the upper folding 102 and lower folding 103 are also symmetrical with respect to the middle of the unfolding direction of the wind blade body 101. That is, in any wind blade structure with upper folding 102 and lower folding 103, the parameters of the upper folding 102 and lower folding 103 are the same. In actual use, the upper folding 102 and lower folding 103 can also be an asymmetrical structure connected to the wind blade body 101, which will not be elaborated here.

[0099] In this embodiment, on any cross-section of the central axis of the blade, the outer edge of the blade body 101 is an arc shape bulging outward from the center; on a horizontal cross-section, the outer edge of the blade body 101 is an arc shape bulging outward from the center. The arc shape includes any curved line segment on a circle or ellipse; or, a continuous curved curve formed by connecting a series of points; or, composed of several arc segments, etc., which will not be elaborated here.

[0100] Specifically, on any cross-section of the central axis of the blade, the outer edge of the blade body 101 is an arc shape bulging outward from the center, which is any curved line segment on a circle or ellipse. On the horizontal cross-section, the outer edge of the blade body 101 is an arc shape bulging outward from the center, which is any curved line segment on a circle or ellipse. Along the height direction of the blade, the diameter of the horizontal cross-section of the blade body 101 gradually decreases from the center to both ends, so that the curved surface of the blade body 101 is approximately a spindle-shaped curved surface. Specifically, the spindle-shaped curved surface is divided into sections at a certain angle along the rotation axis. The structure of the main body 101 of this wind turbine can disperse the concentrated wind pressure at the central protrusion position, reduce fatigue damage at the root of the wind turbine, extend its service life, and enable the vertical axis wind turbine to start at low wind speeds. Furthermore, after the wind turbine is applied in the vertical axis wind turbine, during rotation, the central protrusion of the wind turbine forms a larger windward area at the 0° to 90° position, significantly increasing the positive torque; at the 90° to 180° position, it quickly discharges air and reduces negative torque interference. Compared with the current wind turbine 001 structure that only bends along the unfolding direction, it has better aerodynamic performance and can improve the utilization rate of wind kinetic energy.

[0101] In this embodiment, in any wind turbine blade structure with an upper folding wing 102 and a lower folding wing 103, the upper folding wing 102 and the lower folding wing 103 each respectively include a wingtip 1002 connected to the wind turbine body 101 and a wingtip 1003 extending outward from the outer edge of the wingtip 1002. The outer edge of the wingtip 1003 is an outwardly convex arc shape. The wingtip 1002 is formed by extending the edge contour of the wind turbine body. After extension, the outer edge of the wingtip 1002 is parallel to the edge of the wind turbine body. The wingtip 1003 is used to make the outer edges of the folding wings (upper folding wing 102 and lower folding wing 103) have an outwardly convex arc shape, so as to suppress the vortex of the wingtip 1003 and improve the energy conversion efficiency of the wind turbine. Both the upper folding wing 102 and the lower folding wing 103 have a wingtip 1002 and a wingtip 1003, and their structures may be the same or different, which will not be described in detail here.

[0102] In this embodiment, in any wind turbine blade structure with an upper folding wing 102 and a lower folding wing 103, the ratio of the outward extension length L of the wingtip 1002 to the farthest protrusion h of the wind turbine blade body 101 is 0 < L / h ≤ 0.5. The wingtip 1002 is used to form a smooth expansion channel for the folding wing (upper folding wing 102 or lower folding wing 103), so that the vortex generation position of the corresponding wingtip 1003 is far away from the main lift zone, accelerating the attenuation of vortex energy, reducing wind turbine blade drag loss, and improving energy conversion efficiency; and the extension structure of the wingtip 1002 can also establish a directional guiding channel, guiding the boundary layer airflow outward, reducing end backflow, and thus suppressing wind turbine blade whistling. Among them, the ratio of the extension length L of the wingtip 1002 of the upper folding wing 102 and the wingtip 1002 of the lower folding wing 103 to the farthest protrusion h of the wind turbine blade body 101 is within the above range, and the two ratios can be the same or different, which will not be elaborated here.

[0103] In the first wind turbine blade implementation structure with upper folding 102 and lower folding 103, the value of L / h is 0.14. In the second wind turbine blade implementation structure with upper folding 102 and lower folding 103, L is twice that of the first wind turbine blade implementation structure with upper folding 102 and lower folding 103, that is, the value of L / h is 0.28. In the third wind turbine blade implementation structure with upper folding 102 and lower folding 103, the value of L / h is 0.35, which can better suppress the vortex at the tip of the wind turbine blade.

[0104] In this embodiment, in any wind turbine structure with an upper folding wing 102 and a lower folding wing 103, the ratio of the furthest outward extension length H of the upper folding wing 102 and the furthest outward extension length L of the corresponding tail wing 1002 is 1 ≤ H / L ≤ 3.5. This allows for further control of the fatigue load on the folding wings (upper folding wing 102 and lower folding wing 103) while meeting the above characteristics, reducing the risk of fatigue fracture and avoiding aeroelastic flutter caused by excessively long folding wings, resulting in superior structural safety. H represents the maximum total length of the tail wing 1002 and the wingtip 1003. When H / L is 1, it is suitable for folding wing structures directly extending from the end edge contour of the wind turbine body with a circular arc cross-section. In this structure, the tail wing 1002 of the folding wing is an arc segment of equal width, and the outer edge of the tail wing 1002 is the unexposed wingtip 1003. The ratios of the furthest outward extension length of the upper wing 102 and the furthest outward extension length H of the lower wing 103 to the outward extension length L of the corresponding tail 1002 are all within the above range, and the two ratios may be the same or different, which will not be elaborated here.

[0105] In the first and second wind turbine blade implementation structures with upper and lower folding blades 102 and 103, the value of H / L is 2. In the third wind turbine blade implementation structure with upper and lower folding blades 102 and 103, the value of H / L is 1.4, which can better balance the suppression of fatigue damage of the folding blades and the aeroelastic stability.

[0106] In this embodiment, the angle β between the edge of the wingtip 1002 in the width direction and the transition connection edge between the wingtip 1002 and the blade body 101 does not exceed 150°. The edge of the wingtip 1002 in the width direction includes two end edges. The structure of the wingtip 1002 can be symmetrical or asymmetrical relative to the middle of the wingtip 1002's unfolding direction. That is, the angle β between the two end edges and the corresponding edge of the blade body 101 can be the same or different, which will not be elaborated here. The angle β is used to limit the unfolded shape of the folding wing (upper folding wing 102 or lower folding wing 103) to ensure the overall aerodynamics of the blade. Among them, the angle β between the edge of the upper folding wing 1002 in the width direction and the edge of the lower folding wing 103 in the width direction and the transition connection edge of the blade body 101 can also be the same or different, which will not be elaborated here.

[0107] In the first and second wind blade implementation structures with upper and lower folding blades 102 and 103, the value of β is 90°. In the third wind blade implementation structure with upper and lower folding blades 102 and 103, the end edge of the wind blade body 101 is an arc curve, and the wind blade body 101 and the tail 1002 are smoothly transitioned by a transition surface 1001. The angle between the tangent line passing through the width edge of the tail 1002 and the tangent line passing through the end edge curve of the wind blade body 101 is β. In the third wind blade implementation structure, β is 15°, which can better improve energy conversion efficiency.

[0108] In this embodiment, in any wind turbine blade structure with an upper folding wing 102 and a lower folding wing 103, the deflection angles of the upper folding wing 102 and the lower folding wing 103 are respectively between -45° and 45°. More preferably, the deflection angles of the upper folding wing 102 and the lower folding wing 103 are respectively between -25° and 25°. It should be understood that the reference plane for the deflection angle is the horizontal plane when the wind turbine blade is in use. Within the deflection angle range of the folding wings (upper folding wing 102 and lower folding wing 103), the folding wings can be straight, curved upwards, curved downwards, S-shaped, or wavy, etc., to reduce energy loss and drag. The deflection angles of the upper folding wing 102 and the lower folding wing 103 are both within the above-mentioned range, and their deflection angles can be the same or different, which will not be elaborated further here.

[0109] In the first and second wind turbine blade implementation structures with upper and lower folding blades 102 and 103, the folding blades (upper and lower folding blades 102 and 103) are flat and the folding blade deflection angle is 0°. In the third wind turbine blade implementation structure with upper and lower folding blades 102 and 103, the folding blades (upper and lower folding blades 102 and 103) are brim-shaped and the folding blade deflection angle is 20°.

[0110] More preferably, within the aforementioned deflection angle range, on any cross-section along the central axis of the blade, the extension direction of the folding blade (upper folding blade 102 or lower folding blade 103) and the tangent direction at the junction of the blade body 101 and the folding blade (upper folding blade 102 or lower folding blade 103) form an angle α, where 60°≤α≤120°. This reduces eddies at the upper and lower edges of the blade, reducing energy loss; it also reduces turbulent flutter at the blade's height, thus suppressing airflow whistling at the blade tip. The tangent angle α between the upper folding blade 102 or lower folding blade 103 and the corresponding edge of the blade body 101 is within the aforementioned range. The two angles α can be the same or different, which will not be elaborated further here.

[0111] In the first and second wind turbine blade implementation structures with upper folding 102 and lower folding 103, α is 75°; in the third wind turbine blade implementation structure with upper folding 102 and lower folding 103, α is 85°. This makes the folding 102 (upper folding 102 or lower folding 103) and the main body of the wind turbine blade 101 closer to the vertical state, which can better balance the aerodynamic load distribution of the wind turbine blade, meet efficiency and loss control, meet structural strength requirements, and meet noise reduction requirements.

[0112] In this embodiment, in any wind turbine blade structure with an upper folding 102 and a lower folding 103, the upper folding 102 and the lower folding 103 are formed by bending outwards from the upper and lower ends of the wind turbine blade body 101, respectively. That is, the upper folding 102 and the lower folding 103 are integrally formed with the wind turbine blade body 101; this improves the connection strength and durability of the connection between the upper folding 102 and the lower folding 103 and the wind turbine blade body 101, resulting in a wind turbine blade with higher overall structural strength and longer service life. Furthermore, the blade exhibits excellent consistency, allowing for better control of its center of gravity after application to a vertical axis wind turbine, which is beneficial for achieving the preset target energy conversion rate of the wind turbine.

[0113] In this embodiment, in any wind turbine blade structure with an upper folding wing 102 and a lower folding wing 103, the upper folding wing 102 or the lower folding wing 103 smoothly transitions to or directly engages with the wind turbine blade body 101. That is, the upper folding wing 102 or the lower folding wing 103 is selected to smoothly transition to or directly engage with the wind turbine blade body 101, which will not be elaborated further here. The smooth transition means that the folding wing (upper folding wing 102 or lower folding wing 103) and the wind turbine blade body 101 are smoothly engaged through a transition surface. On any cross-section passing through the central axis of the wind turbine blade, the folding wing and the wind turbine blade body 101 are transitioned through an arc angle. The direct engagement means that the folding wing (upper folding wing 102 or lower folding wing 103) is directly connected to the wind turbine blade body 101 at an angle. On any cross-section passing through the central axis of the wind turbine blade, the folding wing and the wind turbine blade body 101 are transitioned through a sharp angle.

[0114] The upper wing 102 and / or lower wing 103 each smoothly transition to the blade body 101 via a transition surface 1001. The "and / or" means that either the upper wing 102 or the lower wing 103 smoothly transitions to the blade body 101 via the transition surface 1001, or the upper wing 102 and the lower wing 103 smoothly transition to the blade body 101 via the transition surface 1001. On any cross-section along the blade's central axis, the ratio of the radius r of the corresponding transition surface 1001 to the outward extension length L of the wingtip 1002 is 0 ≤ r / L ≤ 0.5. The transition surface 1001 is used to make the transition between the blade body 101 and the corresponding wing (upper wing 102 or lower wing 103) smoother and more fluid, thereby improving the aerodynamic performance of the blade and guiding the airflow inside the blade, reducing blade tip vibration, and further enhancing the stability of the blade during use. If the upper folding blade 102 and the lower folding blade 103 are respectively smoothly transitioned to the main body of the wind turbine 101 through the transition surface 1001, then the value of r / L is within the above range, and the two values ​​can be the same or different, which will not be elaborated here.

[0115] In both the first and second wind turbine blade implementation structures with upper and lower folding blades 102 and 103, the folding blades (upper folding blade 102 and lower folding blade 103) are directly joined to the blade body 101. The folding blades are directly connected to the edge of the blade body 101. It should be understood that, to ensure effective joining and reduce connection difficulty, the end edge of the blade body 101 is adaptively joined or forms a transition portion for connecting the folding blades. Specifically, the end edge of the blade is aligned and connected to the edge of the folding blade in a straight line. The transition portion is a curved surface located between the mating line and the end edge of the blade body 101. This curved surface smoothly transitions the mating line to the blade body 101, ensuring the overall continuity of the wind turbine blade. The central protrusion effectively disperses bending stress and resists the load in the region of maximum bending moment. At the same time, the folds corresponding to the top and bottom edges reduce vortices at the upper and lower edges of the blade, giving the blade good aerodynamic performance, improving wind energy capture efficiency, and increasing the energy conversion rate of the vertical axis wind turbine. The convex curved surface of the blade body 101 can delay airflow separation internally, suppress gas flow separation, and increase aerodynamic efficiency. On the outside of the folds, the intensity of vortices at the blade tip in the height direction can be reduced, suppressing vortices and reducing energy loss. It can also reduce turbulent vibration at the blade tip in the height direction, thereby suppressing airflow howling at the blade tip, suppressing noise, and reducing noise pollution. Therefore, compared with the existing technology, it can improve the energy conversion rate of the vertical axis wind turbine.

[0116] In the third wind turbine blade implementation structure with upper folding blade 102 and lower folding blade 103, the upper folding blade 102 and lower folding blade 103 respectively correspond to the main body of the wind turbine blade 101 and smoothly transition through the transition surface 1001, so that the wind turbine blade has a continuous curved surface structure with a central convex shape and two concave ends along the height direction of the wind turbine blade; specifically, the middle part of the wind turbine blade is a positive curvature bulge, similar to a spindle-shaped curved surface divided into half along the rotation axis, and the upper folding blade 102 and lower folding blade 103 corresponding to the upper and lower ends are negative curvature concave, similar to a saddle-shaped surface, forming a composite curved surface with alternating curvature directions; in the third wind turbine blade with upper folding blade 102 and lower folding blade 103 In the implemented structure, the gas inside the blade is effectively guided to the outside of the blade along the transition surface 1001, improving the aerodynamic performance of the blade; it can also actively guide the gas to flow smoothly from the inside to the outside at the blade tip edge, reducing turbulent vibration at the blade tip in the height direction, thereby further suppressing the airflow howling at the blade tip, suppressing noise, and reducing noise pollution; the reverse-bending wing structure of the blade combined with the smooth transition surface 1001 can also reduce the divergence of airflow towards the rotation axis, reduce the impact on the rotating main shaft of the vertical axis wind turbine, reduce the vibration of the rotating main shaft, and further improve the energy conversion efficiency of the vertical axis wind turbine.

[0117] In the third wind turbine blade implementation structure with upper folding 102 and lower folding 103, the upper folding 102 and lower folding 103 are smoothly connected to the wind turbine body 101 through corresponding transition surfaces 1001. The transition surfaces 1001 are used to make the wind turbine body 101 and the folding 103 transition more smoothly, thereby improving the aerodynamic performance of the wind turbine blade and guiding the airflow inside the wind turbine blade, reducing the vibration at the tip of the wind turbine blade. In the third wind turbine blade implementation structure with upper folding 102 and lower folding 103, the value of r / L is 0.5, which makes the transition between the wind turbine body and the folding 103 smoother and more efficient, thus improving the stability of the wind turbine blade during use.

[0118] This solution also corresponds the wind turbine body 101, the first type of wind turbine with upper folding blade 102 and lower folding blade 103 to the second type of wind turbine with upper folding blade 102 and lower folding blade 103, and after application in a vertical axis wind turbine, the following parameters were obtained in wind power tests. None of the above three wind turbine structures are equipped with functional bars: Figure 24 This is a schematic diagram of the structure for wind power testing of this utility model, including a wind tunnel 200 for placing a vertical axis wind turbine generator 100. The wind tunnel has an air inlet and an air outlet to simulate natural wind for verification of this utility model.

[0119] in, Figure 25 and Figure 26 In the figure, the prototype is a vertical axis wind turbine with a blade body 101. M1 is the blade of the vertical axis wind turbine, which is the first type of blade implementation structure with an upper folding 102 and a lower folding 103. M2 is the blade of the vertical axis wind turbine, which is the second type of blade implementation structure with an upper folding 102 and a lower folding 103. The vertical axis represents torque (N·m), and the horizontal axis represents mass flow rate (kg / s).

[0120] from Figure 25 It can be seen that at 150 RPM, the linearity of M1 and M2 is generally better than that of the prototype. Figure 26 It can be seen that at 200 RPM, the linear shape of M1 and M2 is roughly matched with the prototype in the first part, and is consistently better than the prototype in the second part. This means that the aerodynamic performance of the blades with folded blades (upper folded blade 102 and lower folded blade 103) is better. When applied to vertical axis wind turbines, the wind energy capture efficiency is higher, which in turn makes the energy conversion rate of the wind turbine higher.

[0121] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A vertical axis wind turbine generator with a center of gravity stabilization function, comprising a rotating main shaft, a blade support arm, and blades, wherein the blades are mounted on the rotating main shaft via the blade support arm, and the rotating main shaft is drively connected to a generator set; characterized in that: It also includes functional strips for blade counterweight and / or blade reinforcement, the functional strips wrapping around the outer surface of the blade in a horizontal direction, the functional strips comprising a plurality of strips distributed on the surface of the blade along the height direction of the blade.

2. The vertical axis wind turbine with center of gravity stabilization function according to claim 1, characterized in that: The fan blade has a receiving groove for accommodating a functional strip, which is embedded in the receiving groove and fixed to the fan blade.

3. The vertical axis wind turbine with center of gravity stabilization function according to claim 2, characterized in that: The receiving groove runs transversely across the outer surface of the wind blade along the unfolding direction of the wind blade, and the outer surface of the functional strip smoothly transitions with the outer surface of the wind blade.

4. The vertical axis wind turbine with center of gravity stabilization function according to claim 1, characterized in that: Several functional strips are evenly spaced along the height of the wind turbine blades.

5. The vertical axis wind turbine with center of gravity stabilization function according to claim 1, characterized in that: The material density of the functional strip is greater than that of the wind turbine blade.

6. The vertical axis wind turbine with center of gravity stabilization function according to claim 3, characterized in that: The fan blade is provided with a support for mounting the fan blade arm, and the support is located on the inner side of the functional bar so that the fan blade arm supports the functional bar when in use.

7. The vertical axis wind turbine with center of gravity stabilization function according to claim 6, characterized in that: The functional bar has an assembly end that passes through the fan blade and extends out of the support part, and the assembly end is provided with fasteners; in use, the fan blade support arm is set at the assembly end by the fasteners and is supported by the support part.

8. The vertical axis wind turbine with center of gravity stabilization function according to claim 6, characterized in that: The support portion consists of several units arranged along the length of the functional strip on the fan blade.

9. The vertical axis wind turbine with center of gravity stabilization function according to claim 2, characterized in that: The surface curvature of the functional strip is continuous with the surface curvature of the wind turbine blade, and the height difference does not exceed 1 mm.

10. The vertical axis wind turbine generator with center of gravity stabilization function according to claim 1, characterized in that: The wind turbine blade includes a main body, and the upper and lower ends of the main body extend outward to form an upper folding wing and a lower folding wing, respectively.

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