Vertical axis wind turbine

Abstract

The invention discloses a vertical axis wind turbine which comprises a wind power input device, a generator set and a support, and the generator set is located on the support and used for receiving power transmitted by the wind power input device. The wind power input equipment comprises a rotating main shaft, fan blade support arms and fan blades, the fan blades are assembled on the rotating main shaft through the fan blade support arms, and the rotating main shaft is in transmission connection with the generator set supported by the support; a plurality of functional strips used for balancing weights of the fan blades and / or reinforcing the fan blades are arranged on the fan blades, the functional strips wrap the surfaces of the fan blades in the horizontal direction, and the functional strips are distributed side by side in the height direction; the structure of a current resistance type vertical axis wind turbine can be optimized so as to meet the requirement for energy conversion efficiency.

Description

Technical Field

[0001] The present invention relates to the field of wind power generation equipment, and in particular to a vertical axis wind turbine. Background Art

[0002] Vertical axis wind turbines (VAWT) are mainly divided into drag type and lift type. Drag type vertical axis wind turbines mainly use the resistance generated by air flowing through the blades as the driving force, while lift type uses the lift generated by air flowing through the blades as the driving force.

[0003] Drag-type vertical-axis wind turbines primarily rely on wind resistance against the blade surface to propel their rotation. A typical structure is the Savonius type. Their operating principle is that when the wind blows in a certain direction, the concave surface of the blade experiences greater wind resistance than the convex surface, creating a torque difference that drives the rotor.

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

[0005] Low speed: Since it relies on wind resistance to drive, the speed is relatively low.

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

[0007] Low efficiency: The overall efficiency is low, but it can work under complex wind conditions.

[0008] The structural features of the resistance-type vertical axis wind turbine include that the blades are installed on the rotating main shaft through cantilever beam-type blade arms. When working, the wind force is used as the power to rotate the rotating main shaft and input the power into the generator to convert it into electricity.

[0009] Current resistance-type vertical axis wind turbines encounter many difficulties during optimization. For example, the preparation cost of the blades is high, and heavy blades have problems such as delayed dynamic response and low energy conversion rate. Although existing lightweight solutions can reduce the weight of the blades, due to the constraints of the blade structure and production conditions, the quality of the blade products is poor. There are problems such as inconsistent wall thickness of the finished blades, inconsistent mass distribution of the blades with the design, resulting in the center of gravity of the blades being offset, and the flutter of the blades being aggravated after the blades are used. In addition, the flutter of the blades will be transmitted to the rotating main shaft through the blade arms, causing the use environment of the entire equipment to become harsh and the energy conversion rate of the equipment to be difficult to meet the preset requirements.

[0010] Therefore, in order to solve the above problems, a vertical axis wind turbine is needed that can optimize the structure of the current resistance-type vertical axis wind turbine to meet the requirements of energy conversion efficiency. Summary of the Invention

[0011] In view of this, an object of the present invention is to overcome the defects in the prior art and provide a vertical axis wind turbine that can optimize the structure of the current resistance-type vertical axis wind turbine to meet the requirements of energy conversion efficiency.

[0012] The vertical axis wind turbine of the present invention comprises a wind power input device, a generator set and a support, wherein the generator set is located on the support and is used to receive power transmitted from the wind power input device;

[0013] The wind power input equipment includes a rotating main shaft, a blade support arm and blades, the blades are assembled on the rotating main shaft through the blade support arm, and the rotating main shaft is connected to the generator set through a transmission supported by a support;

[0014] The fan blade is provided with a plurality of functional strips for blade counterweight and / or blade reinforcement. The functional strips surround the surface of the fan blade in a horizontal direction, and a plurality of the functional strips are distributed in parallel in a height direction.

[0015] Furthermore, the fan blade has a receiving groove for receiving the functional strip, and the functional strip is embedded in the receiving groove and fixed to the fan blade; the surface of the functional strip transitions smoothly with the surface of the fan blade.

[0016] Furthermore, the accommodating groove is transverse to the outer surface of the fan blade along the expansion direction of the fan blade, the functional strip is arranged on the outer side of the fan blade, and the outer surface of the functional strip and the outer surface of the fan blade are smoothly transitioned.

[0017] Furthermore, the fan blade support arm is located on the inner side of the fan blade and supported on the functional strip, and a plurality of fan blade support arms supported on the same functional strip constitute a support arm group.

[0018] Furthermore, a group of the support arm groups are arranged on the rotating main shaft through the same shaft sleeve; the shaft sleeve is coaxial with the rotating main shaft and the ring sleeve is connected to the rotating main shaft; in the same cross section, the outer diameter of the shaft sleeve is larger than the outer diameter of the rotating main shaft.

[0019] Furthermore, the sleeve has a mounting surface that forms a set angle with the side surface of the sleeve;

[0020] The fan blade support arm has an inner connecting end connected to the shaft sleeve, and the inner connecting end includes a connecting portion I connected to the assembly surface and a connecting portion II connected to the side surface of the shaft sleeve.

[0021] Furthermore, it also includes a limiting member I which limits the connection part I to the shaft sleeve perpendicular to the assembly surface; and a limiting member II which limits the connection part II to the shaft sleeve perpendicular to the side surface of the shaft sleeve.

[0022] Furthermore, the shaft sleeve also has a protective portion protruding from the side surface of the shaft sleeve along the radial direction of the shaft sleeve.

[0023] Furthermore, the support includes a main shaft sleeve coaxially arranged on the root of the rotating main shaft. The support also includes a supporting frame supporting the main shaft sleeve and a protective shell covering the outside of the supporting frame. When in use, the generator set is located in the protective shell, and the rotating main shaft passes through the main shaft sleeve and is connected to the engine set.

[0024] Furthermore, the fan blade includes a fan blade body, and the upper and lower ends of the fan blade body extend outward to form an upper folding wing and a lower folding wing respectively; the functional strip is provided on the fan blade body.

[0025] The beneficial effects of the present invention are as follows: a vertical axis wind turbine disclosed in the present invention can ensure the reliability of the use of the wind blades and overcome the risk of peeling between the wind blade layers by making the wind blades adopt functional strips for adjusting the mass distribution of the wind blades and for improving the structural strength of the wind blades; the mass distribution of the wind blades is adjusted by the functional strips, which solves the problem of poor quality of the wind blade products and makes it easier for the energy conversion rate of the vertical axis wind turbine to meet the preset requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0027] Figure 1 This is a schematic diagram of one structure of the present invention;

[0028] Figure 2 For the present invention Figure 1 Schematic diagram of the main structure;

[0029] Figure 3 For the present invention Figure 1 Schematic diagram of the top view structure;

[0030] Figure 4 It is another structural schematic diagram of the present invention;

[0031] Figure 5 For the present invention Figure 4 Schematic diagram of the main structure;

[0032] Figure 6 For the present invention Figure 4 Schematic diagram of the top view structure;

[0033] Figure 7 A schematic diagram of the structure of the assembly of the shaft sleeve and one of the fan blade arms of the present invention;

[0034] Figure 8 For the present invention Figure 7 A side structural diagram of

[0035] Figure 9 For the present invention Figure 1 Schematic diagram of the cross-sectional structure at point A in the middle;

[0036] Figure 10 It is a structural schematic diagram of the support of the present invention;

[0037] Figure 11 For the present invention Figure 10 Schematic diagram of the structure without the protective shell;

[0038] Figure 12 For the present invention Figure 10 Schematic diagram of the top view structure;

[0039] Figure 13 For the present invention Figure 10 Schematic diagram of the structure viewed from above;

[0040] Figure 14 For the present invention Figure 12 AA structural diagram;

[0041] Figure 15 For the present invention Figure 12 BB structural diagram;

[0042] Figure 16 This is a schematic diagram of the cross-sectional structure of the protective shell of the present invention arranged on the support frame;

[0043] Figure 17 This is a structural schematic diagram of the present invention where the bracket III is hoisted on the bracket I;

[0044] Figure 18 This is a structural diagram of a fan blade embodiment 1 of the present invention (without a functional strip);

[0045] Figure 19 For the present invention Figure 18 A side structural diagram of

[0046] Figure 20 For the present invention Figure 18 Schematic diagram of the top view structure;

[0047] Figure 21 This is a schematic structural diagram of a third embodiment of the fan blade of the present invention (without the functional strip);

[0048] Figure 22 For the present invention Figure 21 A side structural diagram of

[0049] Figure 23 For the present invention Figure 21 Schematic diagram of the top view structure;

[0050] Figure 24 This is a structural diagram of the wind kinetic energy test of the present invention;

[0051] Figure 25 The torque comparison of the fan blade of the present invention is Figure 1 ;

[0052] Figure 26 The torque comparison of the fan blade of the present invention is Figure 2 .

[0053] Figure numerals: fan blade 001, fan blade support arm 002, rotating main shaft 003, protective shell 004, electromagnetic brake 005, reducer 006, generator 007, sleeve 1, assembly surface 2, connection part I3, connection part II4, protective part 5, supporting part 6, functional hole 7, external connection end 8, functional strip 9, support part 10, assembly end 11, fastener 12, bushing 13, main shaft sleeve 14, shielding cover 15, column 16, column supporting plate 17, top cover 18, mounting platform 19, cross bar 20, reinforcement plate 21, bracket I 22, bracket II 23, bracket III 24, connecting rod 25; vertical axis wind turbine 100, wind tunnel 200, fan blade main body 101, upper folding wing 102, lower folding wing 103, transition curved surface 1001, wing tail 1002, wing tip 1003. DETAILED DESCRIPTION

[0054] As shown in the figure, Figures 1 to 3 This is a schematic diagram of the structure of the first vertical axis wind turbine of the present invention. Its blade structure includes a blade body 101 and an upper folding wing 102 and a lower folding wing 103 connected to both ends of the blade body 101 through a transition surface 1001. The functional strip 9 is provided on the blade body 101. Figures 4-6This is a structural diagram of the second vertical axis wind turbine of the present invention, wherein the fan blade structure only includes a fan blade body 101, and the functional strip 9 is provided on the fan blade body 101; the vertical axis wind turbine in this embodiment is described with the first type as an example, and the second type is similar thereto, except that the structure of the fan blade 001 is different, which will not be repeated here. The vertical axis wind turbine of this solution includes wind power input equipment, a generator set and a support; the generator set is located on the support and is used to receive power transmitted by the wind power input equipment; the wind power input equipment includes a rotating main shaft 003, a blade support arm 002 and a blade 001, the blade 001 is assembled on the rotating main shaft 003 through the blade support arm 002, and the rotating main shaft 003 is connected to the generator set by a transmission supported by the support; the generator set of the vertical axis generator converts the captured wind energy into electrical energy through the blades 001 set on the rotating main shaft 003 in the wind power input equipment, and connects the electrical energy to the grid through an inverter; or the generator set of the vertical axis generator converts the captured wind energy into electrical energy through the blades 001 set on the rotating main shaft 003 in the wind power input equipment, the electrical energy is transmitted to the energy storage device, and then applied to the electrical equipment or connected to the grid through the 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 an electrically connected information collection system, control system, and information processing system, such as an anemometer, a speed sensor, a vibration monitor, a frequency converter, and a PLC controller, which are beneficial to the purpose of converting wind energy into electrical energy and using it in this solution. They will not be elaborated here.

[0055] In this embodiment, it also includes several functional strips 9 for counterweighting and / or reinforcing the wind blades, each of the functional strips 9 wraps around the surface of the wind blade in the horizontal direction, and several of the functional strips are distributed in parallel in the height direction; counterweighting means adding functional strips to the wind blade to compensate for the unevenness of the original mass distribution of the wind blade; reinforcement means adding functional strips with supporting capabilities or structural strengthening capabilities to the wind blade to adapt to the vibration resistance requirements of the wind blade and make up for the defects of the wind blade; the meaning of and / or is that the functional strip 9 may only have the function of counterweighting the wind blade or reinforcing the structure of the wind blade, or the functional strip 9 may have both the function of counterweighting the wind blade or reinforcing the structure of the wind blade; it is selected according to the use environment and will not be repeated here. Among them, the functional strip 9 can be covered on the inner surface, outer surface of the fan blade, or wrapped around the fan blade 001, etc., which will not be repeated here; the arrangement of the functional strip 9 on the fan blade 001 can meet the purpose of adjusting the mass distribution of the fan blade, and the functional strip can also be used to improve the structural strength of the fan blade, so as to ensure the reliability of the fan blade and overcome the risk of peeling between the layers of the fan blade.

[0056] Specifically, each functional strip 9 wraps around the surface of the wind blade in the horizontal direction, and several functional strips 9 are distributed on the surface of the wind blade along the height direction of the wind blade; the arrangement of several functional strips 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, which is more conducive to making the mass distribution of the wind blade 001 meet the preset requirements, reducing the frequency of flutter after the wind blade 001 is used in the vertical axis wind turbine, and making it easy for the energy conversion rate of the equipment to meet the preset requirements.

[0057] In this embodiment, a plurality of functional strips 9 are arranged at equal intervals on the blade 001 along its height. The structural layout of the plurality of functional strips 9 at equal intervals can form periodic stiffness-enhanced regions, reducing the risk of resonance. Furthermore, the plurality of functional strips 9 bring the center of gravity of the blade 001 closer to the lower middle portion of the blade 001, thereby improving wind resistance and extending the fatigue life of the blade 001, the blade arm 002, and the main rotating shaft 003. Of course, depending on the differences in the corresponding vertical-axis wind turbine, the plurality of functional strips 9 can be arranged at different intervals and concentrated in the middle or lower portion of the blade 001, etc., to achieve the purpose of adjusting the center of gravity of the blade 001 to a predetermined position or region. This will not be described in detail here.

[0058] In this embodiment, the material density of the functional strip 9 is greater than the main material density of the fan blade 001. When used as a counterweight, it is used to adjust the mass distribution of the fan blade 001 to increase the inertia moment. When used as a reinforcement, it is used to improve the anti-vibration ability of the fan blade and specifically improve the anti-interference ability of the fan blade 001 during operation. For example, a steel strip is used as a functional strip on a fan blade made of fiberglass or carbon fiber in the prior art. Compared with the overall weight increase of the fan blade 001, this solution has the advantage of being lighter. The mass distribution of the fan blade 001 is adjusted by the functional strip 9. The manufacturing material of the fan blade 001 can be selected from lighter materials or materials that are more conducive to adjusting the mass distribution, reducing the difficulty of manufacturing the fan blade 001, making the center of gravity of the fan blade 001 better controlled, thereby ensuring the yield and quality of the finished product of the fan blade 001, and solving the problem of poor product quality of the fan blade 001; and the use of the functional strip 9 can also make the mass distribution of the fan blade 001 closer to or completely consistent with the design value, so as to reduce the negative impact brought about by the fan blade 001 after being applied to the vertical axis wind turbine, making it easier for the energy conversion rate of the vertical axis wind turbine to meet the preset requirements.

[0059] In this embodiment, the top of the rotating main shaft 003 is located at the bottom of the top of the wind blade 001; more specifically, the top of the rotating main shaft 003 along the height direction of the wind blade 001 is located at the upper middle part of the wind blade 001; it can reduce the use length of the rotating main shaft 003 as much as possible, and under the premise of reducing the weight load, it can also keep the center of gravity of the vertical axis wind turbine downward, thereby reducing the swing amplitude of the wind blade 001, improving the wind resistance, and helping to improve the energy conversion rate of the vertical axis wind turbine.

[0060] In this embodiment, the fan blade 001 has a receiving groove for accommodating the functional strip 9. The functional strip 9 is embedded in 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 in the fan blade 001 can make the two stably combined, reduce the risk of separation, and reliably improve 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 embedded structure, an adhesive embedded structure, or a structure fixed by a limiting method such as screws. It is suitable to meet the purpose of embedding the functional strip 9 into the fan blade 001 and fix it. It will not be repeated here.

[0061] In this embodiment, the receiving groove runs across the outer surface of the fan blade 001 along the expansion direction of the fan blade 001. The expansion 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 outer side of the fan blade 001. The outer surface of the functional strip 9 and the outer surface of the fan blade 001 have a smooth transition, which is more beautiful and easier to obtain the structure of the fan blade 001, reducing the manufacturing difficulty of the fan blade 001.

[0062] In this embodiment, blade arms 002 are located on the inner side of blades 001 and supported by functional strips 9. Several blade arms 002 supporting the same functional strip 9 constitute an arm group. The number of arm groups corresponds to the number of functional strips 9 on a blade 001, and when in use, they support each functional strip 9 in a one-to-one relationship. In this solution, the functional strips 9 and the corresponding arm groups supporting them form an internal and external clamping structure for blades 001, further improving the connection reliability between blades 001 and blade arms 002, further reducing the transmission of blade 001 vibration to the main shaft 003, and improving the energy conversion efficiency of the vertical-axis wind turbine.

[0063] In this embodiment, a blade arm 002 has an external connection end 8 connected to a blade 001. The external connection ends 8 of several blade arms 002 in a group of arms are correspondingly connected to a functional strip 9. The inner surface of the blade 001 has a support portion 10 for mounting the external connection end 8. The functional strip 9 has an assembly end 11 that passes through the blade 001 and extends out of the support portion 10. The external connection end 8 is attached to the assembly end 11 via a fastener 12 and supported by the support portion 10. The functional strip 9 is assembled with the external connection end 8 of the blade arm 002 by passing through the assembly end 11 of the blade 001, thereby securing the blade 001. This improves the installation strength of the functional strip 9 on the blade 001 and ensures the installation strength of the blade 001 on the blade arm 002, thereby improving the wind energy capture efficiency and the energy conversion rate of the vertical axis wind turbine. A bushing 13 is provided between the support portion 10 and the functional strip 9, which is externally mounted on the assembly end 11 to further strengthen the structure.

[0064] Specifically, the assembly end 11 is a screw formed on the inner side of the functional strip 9, and the fastener 12 is a nut threadedly connected to the screw, which has the advantages of high assembly efficiency and stable and reliable connection nodes. The support portion 10 of this solution is located on the inner surface of the fan blade 001, making the assembly of the external connection end 8 on the support portion 10 more reliable. The number of support portions 10 is consistent with the number of external connection ends 8, and when in use, the external connection ends 8 are supported in a one-to-one relationship. The support portion 10 of this solution is a hollow cover-like structure that is snap-fitted and fixed to the inner surface of the fan blade 001, and the support portion 10 is located on the inner side of the functional strip 9. During assembly, the screw passes through the fan blade 001 and the support portion 10 at the corresponding position. The external connection 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 fastens the external connection end 8 to the support portion 10 through the nut. Among them, the screw is also provided with a bushing 13 located in the hollow cavity of the cover structure. The bushing 13 plays a protective function and at the same time supports the inner surface of the fan blade 001 and the inner surface of the hollow cavity of the support part 10, which is beneficial to the fixation of the external connection 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, it is passed through the fan blade 001 and the fan blade support arm 002 to play the corresponding installation and support functions, which will not be repeated here.

[0065] In this embodiment, a group of support arms are arranged on the rotating main shaft 003 through the same shaft sleeve 1, and each fan arm 002 corresponds to the central axis perpendicular to the rotating main shaft 003; the shaft sleeve 1 is coaxial with the rotating main shaft 003 and the annular sleeve is connected to the rotating main shaft 003; on the same cross section, the cross section is a surface perpendicular to the axial direction of the rotating main shaft 003, and the outer diameter of the shaft sleeve 1 is larger than the outer diameter of the rotating main shaft 003.

[0066] The fan blades 001 are arranged on the rotating main shaft 003 by a number of fan blade arms 002 located in the radial direction of the sleeve 1, thereby improving the structural strength of the rotating main shaft 003 in the area where the fan blade arms 002 are assembled, thereby improving the connection reliability between the rotating main shaft 003 and the fan blade arms 002; by setting the sleeve 1 on the rotating main shaft 003, the radial dimension of the rotating main shaft 003 can be increased in the preset area of ​​the rotating main shaft 003, the rigidity of the rotating main shaft 003 can be improved, the torsional resistance can be met, and the problem of insufficient rigidity, poor bending and torsional resistance, easy vibration or deformation, and indirect impact on the dynamic stability of the center of gravity caused by small-sized shaft diameters can be overcome; under the premise of ensuring the use ability of the rotating main shaft, the radial dimension of the rotating main shaft can be reduced, and the goal of lightweighting the power shaft assembly can be achieved, so that the vertical axis wind turbine can be conveniently deployed when used as emergency equipment; and compared with the method of directly increasing the shaft diameter, the service life of the equipment can be improved under environmental conditions such as vibration.

[0067] The shaft sleeve 1 also provides a larger installation area for the fan blade support arm 002, so that after the fan blade support arm 002 is installed on the shaft sleeve 1, the problem of insufficient size of the installation position of the arm group of the rotating main shaft 003 is overcome, resulting in concentrated overlap of the fan blade support arm 002, which is prone to fatigue cracking or breakage at the overlap position, and even tearing of the rotating main shaft 003; at the same time, the increase in the shaft diameter of the preset area has basically no effect on the center of gravity offset of the overall vertical axis wind turbine, and can also overcome the problem of dynamic instability of the center of gravity; that is, on the premise that the rotating main shaft 003 maintains a small shaft diameter, the shaft sleeve 1 is added to the set area of ​​the rotating main shaft 003, so that the rotating main shaft 003 not only has good bending and torsion resistance, which is beneficial to the assembly of the fan blade support arm 002, but also can keep the center of gravity of the entire equipment stable, and thus is beneficial to the optimization of the fan blade 001 and the fan blade support arm 002, so that the energy conversion rate of the vertical axis wind turbine is easier to meet the preset requirements.

[0068] In this embodiment, the sleeve 1 has an assembly surface 2 that is at a set angle to the side of the sleeve; generally, the angle between the assembly surface 2 and the side of the sleeve 1 is between 30° and 90° to reduce the force exerted by the fan arm 002 on the rotating main shaft 003; preferably, the assembly surface 2 is perpendicular to the side of the sleeve 1 to reduce the force transmitted by the fan arm 002 to the rotating main shaft 003, thereby improving the structural reliability and reducing fatigue damage at the connection between the sleeve 1 and the fan arm 002.

[0069] In this embodiment, the fan blade support arm 002 has an inner connecting end connected to the shaft sleeve 1, and the inner connecting end includes a connecting portion I3 connected to the assembly surface 2 and a connecting portion II4 connected to the side of the shaft sleeve 1; the connecting portion I3 and the connecting portion II4 are separated from each other along the axial direction of the shaft sleeve 1 to reduce the force interference at the connection between the fan blade support arm 002 and the shaft sleeve 1, and at the same time increase the structural stability of the inner connecting end of the fan blade support arm 002 after installation on the shaft sleeve 1, which is more conducive to optimizing the structure of the fan blade 001 installed on the fan blade support arm 002.

[0070] In this embodiment, connection part I3 and connection part II4 are located in the same longitudinal section, and the longitudinal section is a surface parallel to the axial direction of the sleeve 1, so that connection part I3 and connection part II4 are arranged in an upper and lower positional relationship in the axial direction of the sleeve 1, which is more conducive to bearing the vertical downward tension transmitted by the fan blade 001, and the cantilever structure is more stable, further reducing the inward transmission of the flutter of the fan blade 001; of course, connection part I3 and connection part II4 can also be arranged in a divergent manner on different longitudinal sections, or the inner connection end of the fan blade support arm 002 also has a connection part III, and connection part I3, connection part II4 and connection part III are arranged in a triangular distribution form, which can all play a corresponding role in improving the connection strength of the fan blade support arm 002 set on the rotating main shaft 003 through the sleeve 1, and will not be repeated here.

[0071] This embodiment also includes a stopper I, perpendicular to the assembly surface 2, which limits the connection portion I3 to the sleeve 1; and a stopper II, perpendicular to the side of the sleeve 1, which limits the connection portion II4 to the sleeve 1. Stopper I and stopper II in this solution are bolts (not shown) that pass through the corresponding connection portions I3 and II4. The bolts are assembled perpendicularly on the corresponding surfaces to ensure structural reliability.

[0072] In this embodiment, the number of limiters I of the mounting connection portion I3 is at least two, arranged side by side in a direction perpendicular to the axial direction of the sleeve 1, and the number of limiters II of the mounting connection portion II4 is at least two, arranged side by side in the axial direction of the sleeve 1, to improve the connection reliability between the fan arm 002 and the sleeve 1 and reduce the risk of fatigue damage. This structure enables the force point of the cantilever structure formed by the fan arm 002 on the rotating main shaft 003 to generate a downward pulling force at the position of limiter I and an upward supporting force at the position of limiter II, further ensuring the assembly reliability of the fan blade 001 on the rotating main shaft 003 through the fan arm 002 and reducing the risk of force damage to the fixed end of the cantilever structure.

[0073] In this embodiment, the sleeve 1 also has a protective portion 5 that protrudes radially from the side of the sleeve 1. The protective portion 5 is used to form a shielding protection for the bearing installation position at the bottom of the rotating main shaft 003, thereby protecting the bearing, reducing the occurrence of bearing jamming caused by the influence of the external environment, ensuring the rotation stability of the rotating main shaft 003, and improving the service life of the vertical axis wind turbine.

[0074] In this embodiment, the protection portion 5 is formed by the top end of the side of the sleeve 1 protruding radially outward along the sleeve 1, and the top surface of the protection portion 5 is flush with the top surface of the sleeve 1; the flush top surface of the protection portion 5 and the top surface of the sleeve 1 serve as the assembly surface 2 for the connection portion I3 to be assembled. Figure 7 and Figure 8 As shown, the overall structure of the sleeve 1 is in the shape of a stepped shaft with a large diameter at the upper end and a small diameter at the lower end. The assembly surface 2 is perpendicular to the side of the sleeve 1. The corresponding limit members I and II of the assembly connection part I3 and the connection part II4 are also perpendicular to each other, and the extension direction of the limit member I is parallel to the axial direction of the sleeve 1, and the extension direction of the limit member II is perpendicular to the axial direction of the sleeve 1. After the limit member II is passed through the connection part II4, it is also passed through the sleeve 1 and connected to the rotating main shaft 003, so that the fan arm 002, the sleeve 1 and the rotating main shaft 003 are connected, the integrity is better, and the structure is simpler.

[0075] In this embodiment, the fan blade support arm 002 further has a supporting portion 6, and the supporting portion 6 has a supporting surface parallel to the side of the protective portion 5; Figure 7 and Figure 8 As shown, in this solution, the supporting surface of the supporting portion 6 is parallel to the axial direction of the sleeve 1, and the side surface of the protective portion 5 has a plane that fits the supporting surface, so that after the fan blade support arm 002 is fixed on the sleeve 1, the supporting surface is supported by the corresponding side surface of the protective portion 5; the supporting surface of the supporting portion 6 is supported by the side surface of the protective portion 5, which can further improve the assembly reliability between the fan blade support arm 002 and the sleeve 1 and the structural reliability of the equipment when in use, and reduce the flutter of the fan blade 001; of course, the structural form of the supporting surface and the side surface of the protective portion 5 also includes arc surface supporting or inclined surface supporting, etc., so as to realize the function that the supporting surface of the fan blade support arm 002 is supported by the corresponding side surface of the protective portion 5 after the fan blade support arm 002 is fixed on the sleeve 1, which is not repeated here.

[0076] In this embodiment, a functional hole 7 is provided on the fan blade support arm 002. The functional hole 7 passes through the plate surface of the fan blade support arm 002 and is provided between the connecting portion I3 and the connecting portion II4. The front side of the functional hole 7 extends forward 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 through 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 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 sharp corner facing forward, so that a gap is formed between the inner connecting end of the fan blade support arm 002 and the shaft sleeve 1. It forms a triangular stable structure, which improves the stress reliability, and the functional hole 7 also makes the rear side of the fan blade support arm 002 have an opening toward the sleeve 1, and the opening makes the connection part I3 and the connection part II4 relatively independent at the inner connection end of the fan blade support arm 002, reducing the interference between the two stress-bearing positions, and can reduce the mass of the fan blade support arm 002, which is beneficial to the improvement of the energy conversion efficiency of the overall equipment; the front is the direction from the middle of the fan blade support arm 002 toward the outer connection end 8 of the fan blade support arm 002 in the extension direction of the fan blade support arm 002, and the rear and front directions are opposite, which will not be repeated here.

[0077] In this embodiment, Figure 7 and Figure 8 As shown, the fan blade support arm 002 is in an "r" shape, and the bottom end of the "r" shape serves as the external connection end 8 for connecting to the fan blade 001, and the top end of the "r" shape serves as the internal connection end for connecting to the shaft sleeve 1; more specifically, the fan blade support arm 002 includes a support arm main body in the shape of a long strip corresponding to the vertical part of the "r" shape and a support arm split in the shape of a long strip corresponding to the oblique insertion part of the "r" shape; the support arm main body and the support arm split are manufactured as one piece, directly forming a functional hole 7 located on the rear side of the fan blade support arm 002.

[0078] The top of the arm body has a flange that is bent perpendicular to the arm body. The outer connecting end 8 is formed by bending the front end of the arm body toward the middle of its own length direction. The supporting portion 6 is formed by bending the rear end of the arm body toward the middle of its own length direction. The connecting portion I3 of the inner connecting end is formed by extending the flange of the arm body backward. The connecting portion II4 of the inner connecting end is formed by bending the rear end of the arm split toward the middle of the length direction of the arm body. The bending directions of the flange, the outer connecting end 8, the supporting portion 6 and the connecting portion II4 are the same. The supporting portion 6 and the connecting portion II4 are roughly parallel and perpendicular to the connecting portion I3, which further satisfies the structural strength of the arm body.

[0079] In this embodiment, two oppositely arranged fan blades are provided on the rotating main shaft 003, and the two fan blades are rotationally symmetrical with the central axis of the rotating main shaft 003 as the rotation center; the two fan blades are located at the same height of the support arm group and are respectively assembled on the same shaft sleeve 1, which reduces the use of the shaft sleeve 1, has a lightweight effect, and also serves the purpose of enhancing dynamic balance, so that the vertical axis wind turbine forms a stable force structure and extends its service life; the number of fan blades 001 is based on the design and is applied to different vertical axis wind turbines, which will not be repeated here.

[0080] In this embodiment, a support is also included, which includes a main shaft sleeve 14 coaxially sleeved at the root of the rotating main shaft 003. The top end of the main shaft sleeve 14 extends into the space surrounded by the two wind blades and is close to the support arm group arranged below the rotating main shaft 003. It can enhance the local bending strength of the structure and reduce the turbulent vibration at the root of the wind blade 001, so that the stability of the rotating main shaft 003 is better; reduce the transmission of wind blade flutter to the support, thereby ensuring the energy conversion rate of the vertical axis wind turbine.

[0081] In this embodiment, the rotating main shaft 003 and the main shaft sleeve 14 are connected through a bearing, the inner ring of the bearing is connected to the rotating main shaft 003, and the outer ring of the bearing is connected to the main shaft sleeve 14; the bearing at this position of this scheme is preferably any square seat spherical bearing suitable for this scheme in the prior art, so as to improve the anti-overturning ability, disperse the radial load, reduce the vibration transmission, and improve the structural stability; the main shaft sleeve 14 serves as a load-bearing shell, and forms a rotating pair with the rotating main shaft 003 through the bearing, the inner ring of the bearing fixes the rotating main shaft 003, and the outer ring fixes the main shaft sleeve 14, realizing the dual functions of torque transmission and radial support, and further improving the rotation stability of the rotating main shaft 003.

[0082] In this embodiment, a shielding cover 15 is provided on the top of the bearing to shield the bearing oil seal; a sleeve 1 for connecting the support arm group is provided below the rotating main shaft 003 and is provided on the top of the shielding cover 15, and the peripheral size of the protective portion 5 of the sleeve 1 exceeds the peripheral size of the shielding cover 15; the lubricating components are further isolated from the external environment, the intrusion of pollutants is reduced, and the stable operation of the rotating pair is ensured.

[0083] In this embodiment, the support also includes a supporting frame supporting the main shaft sleeve 14, and a protective shell 004 covered on the outside of the supporting frame, and the outer surface of the protective shell 004 is smooth; specifically, the supporting frame supports the root of the main shaft sleeve 14, and the protective shell 004 is located on the lower side of the rotating main shaft 003 and covered on the supporting frame. The protective shell 004 is in the shape of a cone with a small upper end and a large bottom end. The cone angle of the cone-shaped protective shell 004 is between 15° and 20°, and this solution is 18°. It is subject to actual design, which is beneficial to reducing wind resistance and reducing equipment vibration. It will not be repeated here.

[0084] In this embodiment, the support framework includes a plurality of columns 16 uniformly distributed radially around the axis of the main shaft sheath 14. The tops of the columns 16 converge at the base of the main shaft sheath 14, giving the support framework a roughly conical tower shape. This provides the multifunctional support with enhanced bending strength, evenly transferring radial loads from the main shaft sheath 14 to the support framework, further suppressing vibrations in the multifunctional support and reducing the risk of resonance, thereby facilitating the energy conversion efficiency of the vertical-axis wind turbine.

[0085] The conical protective shell 004, which is a plurality of columns 16 that surround the supporting frame, has better wind load resistance. More specifically, the inner side of the protective shell has column support plates 17. The column support plates 17 are a number corresponding to the number of columns 16, and the columns 16 and column support plates 17 are connected in a one-to-one relationship.

[0086] The column support plate 17 is integrally formed with the protective shell to enhance the structural strength of the protective shell 004 and optimize the wind resistance of the protective shell;

[0087] By manufacturing the column support plate 17 integrally with the protective shell 004 and connected one-to-one with the column 16, the wind resistance of the multifunctional 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 is also beneficial to reducing the overall mass of the protective shell 004, making it easier to deploy the vertical axis wind turbine when used as emergency equipment.

[0088] When in use, the protective shell 004 is placed outside the supporting frame, and the outer wall of each column 16 fits with the inner wall of each column supporting plate 17. Each column 16 supports the corresponding column supporting plate 17 to further ensure structural stability.

[0089] After the protective shell is covered on the supporting frame, the surface where the outer wall of each column 16 and the inner wall of the corresponding column supporting plate 17 fit together is a curved surface convex outward, so that the supporting frame also plays the role of positioning and limiting the protective shell 004, making the bonding strength between the protective shell 004 and the supporting frame higher.

[0090] In this embodiment, the generator set is located in the protective shell 004 and is arranged 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 beneficial to the heat dissipation of the internal generator set.

[0091] The protective shell 004 also has a top cover 18 that covers the top of the supporting frame. The supporting 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 top ends of adjacent columns 16 are also connected by a cross bar 20, and the cross bar 20 is also connected to the mounting platform 19; the connection strength between the supporting frame and the main shaft sleeve 14 is improved, the structural stability is improved, and it is beneficial to ensure the rotation stability of the rotating main shaft 003; when in use, the protective shell 004 covers the supporting frame and is detachably connected to the supporting frame by bolts passing through the bottom of the mounting platform 19. The top cover 18 is used to make the protective shell 004 better connected to the supporting frame. The setting of the top cover 18 can also prevent the intrusion of wind, sand, rain or foreign objects, and play a role in protecting the internal generator set.

[0092] In this embodiment, a reinforcing plate 21 is provided at one end of the column 16 close to the mounting platform 19. The plane where the reinforcing plate 21 is located 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 stiffness between the support frame and the main shaft sleeve 14, optimizing load transfer, and suppressing the amplitude of the rotating main shaft 003 during rotation, so that the energy conversion rate of the vertical axis wind turbine can more easily reach the preset target value.

[0093] In this embodiment, the generator set includes an electromagnetic brake 005 that is transmission-connected to the rotating main shaft 003 and a generator 007 that is transmission-connected to the electromagnetic brake 005. The generator set also includes a reducer 006. The reducer 006 is located between the electromagnetic brake 005 and the generator 007 and transmission-connects the electromagnetic brake 005 and the generator 007 accordingly. The electromagnetic brake 005 is located in a support and is arranged below the rotating main shaft 003. The electromagnetic brake 005 is used in conjunction with the reducer 006 and the generator 007 to control the 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.

[0094] The rotating main shaft 003 passes through the main shaft sleeve 14 and is provided with an electromagnetic brake 005, and the power input shaft of the reducer 006 is connected through a coupling I, the power output shaft of the reducer 006 is connected to the power input shaft of the generator 007 through a coupling II, and the power output end of the generator 007 is connected to the preset device according to the corresponding application environment; in this scheme, the electromagnetic brake 005, the reducer 006 and the generator 007 are selected from any one of the existing technologies that is suitable for this scheme, and it is appropriate to meet the corresponding needs, which will not be repeated here.

[0095] In this embodiment, the support also includes bracket I 22 for assembling the electromagnetic brake 005, bracket II 23 for assembling the generator 007 and bracket III 24 for assembling the reducer 006; the supporting frame connects bracket I 22 with bracket II 23, and bracket III 24 with bracket I 22.

[0096] Specifically, bracket I 22 is detachably assembled on the reinforcing plates 21 corresponding to several columns 16 by bolts. Bracket I has a flange corresponding to the bending of the reinforcing plate 21, and the flange is detachably assembled on the corresponding reinforcing plate 21 by bolts. Bracket I 22 is located at the upper position of the support frame to form a connection with several columns 16, which plays the function of strengthening the strength of the support structure. At the same time, it also makes the electromagnetic brake 005 assembled on bracket I 22 more stable, further ensuring the operating reliability of the rotating spindle 003.

[0097] Bracket II 23 is detachably assembled on several columns 16 by bolts. Bracket II 23 is located at the lower position of the support frame to form a connection with several columns 16, which plays the role of strengthening the strength of the support structure. At the same time, it also makes the generator assembled on bracket II 23 more stable, further ensuring the operating reliability of the rotating main shaft 003; bracket II 23 supports the generator in a plate shape and closes the bottom end of the support frame to reduce the impact of the external environment on the internal generator set. The plate-shaped bracket II 23 has a flange connecting adjacent columns 16. The flange is formed by bending the periphery of the bracket II 23 downward to ensure the stability of the bracket II 23 set on the support frame.

[0098] Bracket III 24 is detachably mounted on the bottom of bracket I 22 via connecting rod 25. Reducer 006 is arranged on the top of bracket III 24 to improve the transmission reliability of reducer 006 and rotating main shaft 003. The setting of bracket III 24 serves to ensure the coincidence of the axes of the rotating parts of the generator set, 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.

[0099] This solution also discloses three types of fan blade structures with upper folding wings 102 and lower folding wings 103 and a fan blade structure with only a fan blade body 101; in the four fan blade structures, the structure of the fan blade body 101 is the same; when applied to the vertical axis generator of this solution, it is only necessary to set the corresponding functional strips on the fan blade body 101, which will not be repeated here. Figures 1 to 3 As shown, it is a schematic structural diagram of the first vertical axis wind turbine of the present invention, which uses the third blade implementation structure and sets a functional strip 9 thereon; Figures 4-6 1 is a structural diagram of a second vertical axis wind turbine according to the present invention, wherein the blades thereof only include a blade body 101 , and the functional strip 9 is provided on the blade body 101 .

[0100] In this embodiment, in any blade structure having an upper folding wing 102 and a lower folding wing 103, the blade 001 includes a blade body 101, wherein the upper and lower ends of the blade body 101 extend outward to form an upper folding wing 102 and a lower folding wing 103, respectively. The upper folding wing 102 and the lower folding wing 103 are used to reduce eddy currents at the ends of the blade, reduce energy loss, and provide the blade with good aerodynamic performance. When the blade is applied to a vertical axis wind turbine, the wind energy capture efficiency is higher, thereby increasing the energy conversion rate of the wind turbine. The upper folding wing 102 and the lower folding wing 103 can be connected to the blade body 101 by welding, gluing, or integral molding to form a whole, which will not be described in detail here.

[0101] In this embodiment, in any fan blade structure having an upper folding wing 102 and a lower folding wing 103, the upper folding wing 102 and the lower folding wing 103 located at both ends of the fan blade are symmetrical with respect to the middle of the extension direction of the fan blade main body 101, and the upper folding wing 102 and the lower folding wing 103 are also symmetrical with respect to the middle of the expansion direction of the fan blade main body 101, that is, in any fan blade structure having an upper folding wing 102 and a lower folding wing 103, the parameters of the upper folding wing 102 and the lower folding wing 103 are the same; in actual use, the upper folding wing 102 and the lower folding wing 103 can also be an asymmetric structure connected to the fan blade main body 101, which will not be repeated here.

[0102] In this embodiment, in any cross-section passing through the central axis of the blade, the outer edge of the blade body 101 is in the shape of an arc with the center convex outward; in a horizontal cross-section, the outer edge of the blade body 101 is in the shape of an arc with the center convex outward. The arc shape may include any curved line segment on a circle or ellipse; or a continuous curved line formed by connecting a series of points; or a combination of multiple arc segments, etc., which will not be further described here.

[0103] Specifically, on any cross-section passing through the central axis of the fan blade, the outer edge of the fan blade main body 101 is in the shape of an arc bulging outward from the middle, which is any curved line segment on a circle or an ellipse; on the horizontal cross-section, the outer edge of the fan blade main body 101 is in the shape of an arc bulging outward from the middle, which is any curved line segment on a circle or an ellipse; along the height direction of the fan blade, the diameter of the horizontal cross-section of the fan blade main body 101 gradually decreases from the middle to the two ends, so that the curved surface of the fan blade main body 101 is approximately a spindle-shaped curved surface, specifically the part of the spindle-shaped curved surface separated by a certain angle along the rotation axis. The structure of the fan blade main body 101 can disperse the wind pressure concentration point at the protruding position in the middle, reduce fatigue damage at the root of the fan blade, extend the service life, and enable the vertical axis wind turbine to have low wind speed starting performance; and after the fan blade is used in the vertical axis wind turbine, during the rotation process, the protruding part in the middle of the fan blade forms a larger windward area at the 0°~90° position, significantly increasing the positive torque; at the 90°~180° position, it quickly discharges flow, reducing negative torque interference; compared with the current fan blade 001 structure that only bends along the unfolding direction, it has good aerodynamic performance and can improve the utilization rate of wind kinetic energy.

[0104] In this embodiment, in any of the wind blade structures having an upper folding wing 102 and a lower folding wing 103, the upper folding wing 102 and the lower folding wing 103 each correspond to a wing tail 1002 connected to the wind blade body 101 and a wing tip 1003 extending outward from the outer edge of the wing tail 1002, the outer edge of the wing tip 1003 being in an arc shape convex outward, the wing tail 1002 being formed by extending the edge profile of the wind blade body, after being extended, the outer edge of the wing tail 1002 is parallel to the edge of the wind blade body, and the wing tip 1003 is used to make the outer edge of the folding wing (upper folding wing 102 and lower folding wing 103) in an arc shape convex outward, so as to suppress the vortex of the wing tip 1003, which is conducive to improving the energy conversion efficiency of the wind turbine. Among them, the upper folding wing 102 and the lower folding wing 103 both have a wing tail 1002 and a wing tip 1003, and the structures of the two can be the same or different, which will not be described in detail here.

[0105] In this embodiment, in any of the fan blade structures having an upper folding wing 102 and a lower folding wing 103, the ratio of the outward extension length L of the wing tail 1002 to the farthest protrusion distance h of the fan blade body 101 is 0<L / h≤0.5. The wing tail 1002 is used to form a smooth expansion flow channel for the folding wing (upper folding wing 102 or lower folding wing 103), so that the corresponding wing tip 1003 vortex generation position is away from the main lift area, accelerating the attenuation of vortex energy, reducing the resistance loss of the fan blade, and improving the energy conversion efficiency; and the extension structure of the wing tail 1002 can also establish a directional guide channel to guide the boundary layer airflow to be discharged outward, reduce the end backflow, and thus suppress the fan blade whistling. Among them, the ratio of the corresponding extension length L of the wing tail 1002 of the upper folding wing 102 and the wing tail 1002 of the lower folding wing 103 to the farthest protrusion distance h of the fan blade body 101 is both within the above range, and the ratios of the two can be the same or different, which will not be repeated here.

[0106] In the first fan blade implementation structure of this solution having upper folding wings 102 and lower folding wings 103, the value of L / h is 0.14. In the second fan blade implementation structure having upper folding wings 102 and lower folding wings 103, L is twice the L in the first fan blade implementation structure having upper folding wings 102 and lower folding wings 103, that is, the value of L / h is 0.28. In the third fan blade implementation structure having upper folding wings 102 and lower folding wings 103, the value of L / h is 0.35, which can better suppress the vortex at the end of the fan blade.

[0107] In this embodiment, in any fan blade structure having an upper folding wing 102 and a lower folding wing 103, the ratio of the maximum outward extension length H of the upper folding wing 102 and the lower folding wing 103 to the outward extension length L of the corresponding wing tail 1002 is 1≤H / L≤3.5. Under the premise of meeting the above characteristics, the fatigue load of the folding wing (upper folding wing 102 and lower folding wing 103) can be further controlled to reduce the risk of fatigue fracture of the folding wing. At the same time, the aeroelastic vibration caused by the excessive length of the folding wing can also be avoided, and the structural safety is better. H is the maximum total length of the wing tail 1002 and the wing tip 1003. When H / L is 1, it is suitable for a folding wing structure that is directly extended from the end edge contour of the fan blade body with a circular arc cross section. In this structure, the wing tail 1002 of the folding wing is an arc segment of equal width, and the outer edge of the wing tail 1002 is the unextended wing tip 1003. Among them, the ratios of the corresponding maximum outward extension length H of the upper folding wing 102 and the corresponding maximum outward extension length H of the lower folding wing 103 to the corresponding outward extension length L of the wing tail 1002 are all within the above range, and the ratios of the two can be the same or different, which will not be repeated here.

[0108] In the first wind blade implementation structure with upper folding wings 102 and lower folding wings 103 and the second wind blade implementation structure with upper folding wings 102 and lower folding wings 103, the value of H / L is 2. In the third wind blade implementation structure with upper folding wings 102 and lower folding wings 103, the value of H / L is 1.4, which can better balance the folding wing fatigue damage suppression and aeroelastic stability.

[0109] In this embodiment, the angle β between the edge of the wing tail 1002 in the width direction and the transition connection edge between the wing tail 1002 and the fan blade body 101 does not exceed 150°. The edge of the wing tail 1002 in the width direction includes the end edges on both sides. The wing tail 1002 structure can be a symmetrical or asymmetrical structure relative to the middle of the wing tail 1002 deployment direction, that is, the angle β between the end edges on both sides and the corresponding edge of the fan blade body 101 can be the same or different, which will not be described in detail here. The angle β is used to limit the deployment shape of the folding wing (upper folding wing 102 or lower folding wing 103) to ensure the aerodynamics of the fan blade as a whole. Among them, the angle β between the edge of the wing tail 1002 in the width direction of the upper folding wing 102 and the edge of the wing tail 1002 in the width direction of the lower folding wing 103 corresponding to the transition connection edge of the fan blade body 101 can also be the same or different, which will not be described in detail here.

[0110] In the first fan blade implementation structure with upper folding wings 102 and lower folding wings 103 and the second fan blade implementation structure with upper folding wings 102 and lower folding wings 103, the value of β is 90°. In the third fan blade implementation structure with upper folding wings 102 and lower folding wings 103, the end edge of the fan blade body 101 is an arc curve, and the fan blade body 101 and the wing tail 1002 are smoothly transitioned by the transition surface 1001. The angle between the tangent through the width direction edge of the wing tail 1002 and the tangent through the end of the end edge curve of the fan blade body 101 is β; in the third fan blade implementation structure, β is 15°, which can better improve the energy conversion efficiency.

[0111] In this embodiment, in any fan blade structure having an upper folding wing 102 and a lower folding wing 103, the disturbance angle of the upper folding wing 102 and the disturbance angle of the lower folding wing 103 are respectively between -45° and 45°. More preferably, the disturbance angle of the upper folding wing 102 and the disturbance angle of the lower folding wing 103 are respectively between -25° and 25°. It should be understood that the reference plane of the disturbance angle is the horizontal plane when the fan blade is in use. Within the range of the disturbance angle of the folding wing (upper folding wing 102 and lower folding wing 103), the folding wing is straight, curved upward, curved downward, S-shaped or wavy, etc., so as to reduce energy loss and reduce resistance. Among them, the disturbance angle of the upper folding wing 102 and the disturbance angle of the lower folding wing 103 are both within the above range, and the disturbance angles of the two can be the same or different, which will not be repeated here.

[0112] In the first fan blade implementation structure having upper folding wings 102 and lower folding wings 103 and the second fan blade implementation structure having upper folding wings 102 and lower folding wings 103, the folding wings (upper folding wings 102 and lower folding wings 103) are flat-plate-shaped, and the folding wing disturbance angle is 0°. In the third fan blade implementation structure having upper folding wings 102 and lower folding wings 103, the folding wings (upper folding wings 102 and lower folding wings 103) are brim-shaped, and the folding wing disturbance angle is 20°.

[0113] More preferably, within the above-mentioned disturbance angle range, on any cross-section passing through the central axis of the fan blade, the extension direction of the folded wing (upper folded wing 102 or lower folded wing 103) and the tangent direction at the junction of the fan blade body 101 and the folded wing (upper folded wing 102 or lower folded wing 103) form an angle α, 60°≤α≤120°. This reduces the vortex at the upper and lower edges of the fan blade and reduces energy loss; it also reduces the turbulent vibration at the end of the fan blade in the height direction, achieving the purpose of suppressing the airflow whistling at the end of the fan blade. Among them, the tangent angle α between the upper folded wing 102 or the lower folded wing 103 and the corresponding end edge of the fan blade body 101 is within the above-mentioned range, and the angles of the two angles α can be the same or different, which will not be repeated here.

[0114] In the first fan blade implementation structure with upper folding wings 102 and lower folding wings 103 and the second fan blade implementation structure with upper folding wings 102 and lower folding wings 103, α is 75°; in the third fan blade implementation structure with upper folding wings 102 and lower folding wings 103, α is 85°; this makes the folding wings (upper folding wings 102 or lower folding wings 103) and the fan blade body 101 closer to a vertical state, which can better balance the aerodynamic load distribution of the fan blade, meet efficiency and loss control, meet structural strength requirements and noise reduction requirements.

[0115] In this embodiment, in any blade structure having an upper folding wing 102 and a lower folding wing 103, the upper folding wing 102 and the lower folding wing 103 are formed by correspondingly bending outwards at the upper and lower ends of the blade body 101. That is, the upper folding wing 102 and the lower folding wing 103 are integrally formed with the blade body 101. This improves the connection strength and durability of the upper folding wing 102 and the lower folding wing 103 with the blade body 101, resulting in a blade with higher overall structural strength and longer service life. Furthermore, the blade has excellent consistency, enabling better control of its center of gravity after application in a vertical-axis wind turbine, which helps achieve a preset target energy conversion rate for the wind turbine.

[0116] In this embodiment, in any fan blade structure having an upper folding wing 102 and a lower folding wing 103, the upper folding wing 102 or the lower folding wing 103 smoothly transitions with or directly engages with the fan blade body 101. That is, the upper folding wing 102 or the lower folding wing 103 is selected to smoothly transition with or directly engage with the fan blade body 101, which will not be described in detail here. The smooth transition means that the folding wing (upper folding wing 102 or lower folding wing 103) and the fan blade body 101 are smoothly engaged through a transition surface, and on any cross-section passing through the central axis of the fan blade, the folding wing and the fan blade body 101 transition 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 fan blade body 101 at an angle, and on any cross-section passing through the central axis of the fan blade, the folding wing and the fan blade body 101 transition through a sharp angle.

[0117] Wherein, the upper folding wing 102 and / or the lower folding wing 103 correspond to the main body 101 of the fan blade and smoothly transition through the transition surface 1001; the and / or meaning is that one of the upper folding wing 102 or the lower folding wing 103 corresponds to the main body 101 of the fan blade and smoothly transitions through the transition surface 1001, or the upper folding wing 102 and the lower folding wing 103 correspond to the main body 101 of the fan blade and smoothly transition through the transition surface 1001; on any cross-section passing through the central axis of the fan blade, the ratio of the radius r of the corresponding transition surface 1001 to the outward extension length L of the wing tail 1002 is 0≤r / L≤0.5. The transition surface 1001 is used to make the transition between the fan blade main body 101 and the corresponding folding wing (upper folding wing 102 or lower folding wing 103) smoother and more fluent, so as to improve the aerodynamic performance of the fan blade, and can form a guide for the escaped airflow inside the fan blade, reduce the vibration of the fan blade end, and better improve the stability of the fan blade during use. Among them, if the upper folding wing 102 and the lower folding wing 103 each correspond to the fan blade body 101 and smoothly transition through the transition surface 1001; then the value of r / L is within the above range, and the values ​​of the two can be the same or different, which will not be repeated here.

[0118] In the first fan blade implementation structure with upper folding wings 102 and lower folding wings 103 and the second fan blade implementation structure with upper folding wings 102 and lower folding wings 103, the folding wings (upper folding wings 102 and lower folding wings 103) and the fan blade body 101 are directly connected; the folding wings are directly connected to the edge of the fan blade body 101. It should be understood that in order to ensure the effectiveness of the connection and reduce the difficulty of connection, the end edge of the fan blade body 101 is adaptively connected or forms a transition part for connecting the folding wings. Specifically, the end edge of the fan blade is aligned with the edge of the folding wing in a straight line. The transition part is a curved surface between the butt joint and the end edge of the fan blade body 101. The curved surface smoothly transitions the butt joint to the fan blade body 101 to make the overall continuity of the fan blade; the fan blade body 101 The bulge in the middle can effectively disperse the bending stress and resist the load in the maximum bending moment area. At the same time, the folded wings corresponding to the top and bottom edges can reduce the vortex at the upper and lower edges of the blade, so that the blade has good aerodynamic performance, improves the wind energy capture efficiency, and improves the energy conversion rate of the vertical axis wind turbine; the convex curved surface of the blade body 101 can delay the airflow separation internally, suppress the flow separation of the gas, and increase the aerodynamic efficiency; and the outer side of the folded wings can reduce the vortex intensity at the end of the blade in the height direction, suppress the vortex, and reduce energy loss; at the same time, it can also reduce the turbulent vibration of the end of the blade in the height direction, thereby suppressing the airflow whistling at the end of the blade, suppressing noise, and reducing noise pollution, thereby improving the energy conversion rate of the vertical axis wind turbine compared to the existing technology.

[0119] In the third fan blade implementation structure with upper fold wings 102 and lower fold wings 103, the upper fold wings 102 and the lower fold wings 103 respectively correspond to the fan blade body 101 and smoothly transition through the transition curved surface 1001, so that the fan blade presents a continuous curved surface structure with a convex middle part and reverse curvature at both ends along the height direction of the fan blade; specifically, the middle part of the fan blade is a bulge with positive curvature, similar to the half of a spindle-shaped curved surface separated along the rotation axis, and the upper fold wings 102 and the lower fold wings 103 corresponding to the upper and lower ends are reversely curved with negative curvature, similar to a saddle-shaped surface, forming a composite curved surface with alternating curvature directions; in the third fan blade with upper fold wings 102 and lower fold wings 103 In the implementation structure, the gas inside the fan blade is effectively guided to the outside of the fan blade along the transition surface 1001, thereby improving the aerodynamic performance of the fan blade; it can also actively guide the gas to flow smoothly from the inside to the outside at the end edge of the fan blade, reduce the turbulent vibration at the end of the fan blade in the height direction, and further suppress the airflow whistling at the end of the fan blade, suppress noise, and reduce noise pollution; the reverse-bent folding wing structure of the fan blade combined with the smooth transition surface 1001 can also reduce the divergence of the airflow toward the axis of rotation, reduce the impact on the rotating main shaft of the vertical axis wind turbine, and reduce the vibration of the rotating main shaft, so as to further improve the energy conversion rate of the vertical axis wind turbine.

[0120] In the third fan blade implementation structure with an upper folding wing 102 and a lower folding wing 103, the upper folding wing 102 and the lower folding wing 103 are smoothly connected to the fan blade body 101 through the corresponding transition curve 1001; the transition curve 1001 is used to make the transition between the fan blade body 101 and the folding wing smoother and more fluent, so as to improve the aerodynamic performance of the fan blade, and can form a guide for the escaped airflow inside the fan blade, and reduce the vibration of the fan blade end; in the third fan blade implementation structure with an upper folding wing 102 and a lower folding wing 103, the value of r / L is 0.5, which makes the transition between the fan blade body and the folding wing smoother, and better improves the stability of the fan blade during use.

[0121] This solution also corresponds the blade body 101, the first blade implementation structure with the upper folding wing 102 and the lower folding wing 103, and the second blade implementation structure with the upper folding wing 102 and the lower folding wing 103. After being applied in a vertical axis wind turbine, the following parameters were obtained in the wind kinetic energy test. The above three blade structures are not equipped with function bars: Figure 24 Schematic diagram of the structure of the wind kinetic energy test of the present invention, including a wind tunnel 200 in which a vertical axis wind turbine 100 is placed. The wind tunnel has an air inlet and an air outlet to simulate natural wind to verify the present invention.

[0122] 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 vertical axis wind turbine blade having a first blade structure with an upper folding wing 102 and a lower folding wing 103, and M2 is the vertical axis wind turbine blade having a second blade structure with an upper folding wing 102 and a lower folding wing 103; the ordinate is torque (N·m), and the abscissa is mass flow (kg / s).

[0123] from Figure 25 It can be seen from the figure that at 150RPM (150 revolutions per minute), the linear shapes of M1 and M2 are generally better than those of the prototype. Figure 26 It can be seen that at 200 RPM (200 revolutions per minute), the linear shapes of M1 and M2 roughly match the prototype in the front section, and continue to be better than the prototype in the rear section, which means that the wind blade with folded wings (upper folded wings 102 and lower folded wings 103) has better aerodynamic performance. After being applied to the vertical axis wind turbine, the wind energy capture efficiency is higher, thereby making the energy conversion rate of the wind turbine higher.

[0124] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A vertical axis wind turbine, characterized in that: It includes wind power input equipment, a generator set and a support, wherein the generator set is located on the support and is used to receive power transmitted from the wind power input equipment; The wind power input equipment includes a rotating main shaft, a blade support arm and blades, the blades are assembled on the rotating main shaft through the blade support arm, and the rotating main shaft is connected to the generator set through a transmission supported by a support; The fan blade is provided with a plurality of functional strips for blade counterweight and / or blade reinforcement. The functional strips surround the surface of the fan blade in a horizontal direction, and a plurality of the functional strips are distributed in parallel in a height direction.

2. The vertical axis wind turbine according to claim 1, characterized in that: The fan blade has a receiving groove for receiving the functional strip, and the functional strip is embedded in the receiving groove and fixed to the fan blade; the surface of the functional strip transitions smoothly with the surface of the fan blade.

3. The vertical axis wind turbine according to claim 2, characterized in that: The accommodating groove is transverse to the outer surface of the fan blade along the expansion direction of the fan blade. The functional strip is arranged on the outer side of the fan blade, and the outer surface of the functional strip and the outer surface of the fan blade are smoothly transitioned.

4. The vertical axis wind turbine according to claim 3, characterized in that: The fan blade support arm is located on the inner side of the fan blade and supported on the functional strip. A plurality of fan blade support arms supported on the same functional strip constitute a support arm group.

5. The vertical axis wind turbine according to claim 4, characterized in that: A group of support arm groups are arranged on the rotating main shaft through the same shaft sleeve; the shaft sleeve is coaxial with the rotating main shaft and the ring sleeve is connected to the rotating main shaft; in the same cross section, the outer diameter of the shaft sleeve is larger than the outer diameter of the rotating main shaft.

6. The vertical axis wind turbine according to claim 5, characterized in that: The sleeve has a mounting surface that forms a set angle with the side surface of the sleeve; The fan blade support arm has an inner connecting end connected to the shaft sleeve, and the inner connecting end includes a connecting portion I connected to the assembly surface and a connecting portion II connected to the side surface of the shaft sleeve.

7. The vertical axis wind turbine according to claim 6, characterized in that: It also includes a limiting member I which limits the connection part I to the shaft sleeve perpendicular to the assembly surface; and a limiting member II which limits the connection part II to the shaft sleeve perpendicular to the side surface of the shaft sleeve.

8. The vertical axis wind turbine according to claim 6, characterized in that: The shaft sleeve also has a protective portion protruding from the side surface of the shaft sleeve along the radial direction of the shaft sleeve.

9. The vertical axis wind turbine according to claim 1, characterized in that: The support includes a main shaft sleeve coaxially arranged on the root of the rotating main shaft. The support also includes a supporting frame supporting the main shaft sleeve and a protective shell covering the outside of the supporting frame. When in use, the generator set is located in the protective shell, and the rotating main shaft passes through the main shaft sleeve to be connected to the engine set.

10. The vertical axis wind turbine according to claim 1, characterized in that: The fan blade comprises a fan blade main body, and upper and lower ends of the fan blade main body extend outwards to form an upper folding wing and a lower folding wing respectively.

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