A vertical-axis double-driven wind power generation device

Abstract

The present invention discloses a vertical-axis dual-drive wind power generation device, which includes a generator, an inner wind blade assembly and an outer wind blade assembly for respectively driving the outer rotor and the inner rotor of the generator to rotate. The outer shell of the generator constitutes the outer rotor, and the inner rotor is arranged inside the outer shell and is fixed to the vertically arranged inner wind blade shaft. The outer wind blade shaft is coaxially sleeved outside the inner wind blade shaft, and there is a gap between the two. The outer wind blade shaft is fixed to the outer shell of the generator. The outer wind blade assembly is arranged around the outer periphery of the inner wind blade assembly and is fixed to the inner wind blade shaft through an upper fixing frame and a lower fixing frame. In the present invention, the inner and outer wind blade assemblies rotate in opposite directions, and the outer wind blade assembly is arranged around the inner wind blade assembly, sharing the same height space with the inner wind blade assembly, reducing the height of the vertical-axis power generation device, improving stability, reducing costs, and at the same time improving power generation efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of wind power generation devices, and particularly relates to a vertical-axis dual-drive wind power generation device. Background Art

[0002] Wind power generation devices are one of the most important forms of clean and renewable green energy and are being applied more and more widely. However, the power output of wind turbines is relatively low. Therefore, how to improve the conversion rate of wind energy and increase the output power is the key technology of wind power generation devices and has always been the focus of the research and development of wind power generation devices.

[0003] Chinese invention patent CN 104747380A discloses a vertical-axis wind turbine, which includes a wind wheel and a generator. The generator includes an inner rotor and an outer rotor. The wind wheel includes a first wind wheel and a second wind wheel. The first wind wheel drives the inner rotor of the generator to rotate, and the second wind wheel drives the outer rotor of the generator to rotate. The first wind wheel and the second wind wheel rotate in opposite directions. In this solution, the inner rotor and the outer rotor are respectively driven by the first wind wheel and the second wind wheel to rotate relatively, which increases the relative rotation speed between the two and increases the power output. However, this solution has the following problems:

[0004] 1. The first wind wheel and the second wind wheel are arranged vertically, occupying a large vertical space.

[0005] 2. Due to the relatively large vertical height, the stability is poor, the central bearing has a large load capacity, and the service life is low.

[0006] In view of this, it is urgent to improve the existing vertical-axis wind power generation device to improve the power generation efficiency, reduce the overall vertical height, and improve the stability and service life. Summary of the Invention

[0007] Aiming at the above defects, the technical problem to be solved by the present invention is to provide a vertical-axis dual-drive wind power generation device to solve the problems of large vertical space occupation, poor stability, and low service life of the existing wind power generation devices.

[0008] To this end, the present invention provides a vertical-axis dual-drive wind power generation device, which includes a generator, an inner wind blade assembly for driving the outer rotor of the generator to rotate, and an outer wind blade assembly for driving the inner rotor of the generator to rotate. The inner wind blade assembly and the outer wind blade assembly rotate in opposite directions.

[0009] The outer rotor is constituted by the outer shell of the generator. The inner rotor is arranged inside the outer shell and is fixed to a vertically arranged outer wind blade shaft. The outer wind blade shaft is coaxially sleeved outside an inner wind blade shaft, and there is a gap between the two.

[0010] The inner wind blade assembly is fixed to the outer wind blade shaft, and the outer wind blade shaft is fixed to the housing of the generator;

[0011] The outer wind blade assembly is coaxially arranged around the outer periphery of the inner wind blade assembly and is fixed to the inner wind blade shaft through an upper fixing bracket and a lower fixing bracket.

[0012] In the above technical solution, preferably, it further includes a support shaft seat, which is in the shape of a vertical sleeve, and a stepped bearing hole is provided at the upper end of its shaft hole. A first bearing is installed in the stepped bearing hole, and the outer ring of the first bearing is axially fixed. A shaft shoulder is provided at the mating part of the inner wind blade shaft and the first bearing to axially fix the inner ring of the first bearing; a second bearing is provided at the lower end of the shaft hole of the support shaft seat, and the lower end of the inner wind blade shaft is inserted into the second bearing.

[0013] In the above technical solution, preferably, the inner wind blade assembly includes a first blade and a second blade, which are respectively fixed to the outer wind blade shaft. The first blade and the second blade have the same structure, and the windward surface is an arc surface arranged in a spiral shape from top to bottom, and the windward surfaces of the first blade and the second blade are symmetrically arranged in reverse by 180 degrees.

[0014] In the above technical solution, preferably, the housing of the generator is assembled by an upper cover and a lower cover. A flange is provided at the lower end of the outer wind blade shaft and is fixed to the upper end surface of the upper cover through the flange; a positioning ring is provided around the central shaft hole on the upper end surface of the upper cover, and the positioning ring is inserted into the gap between the inner wind blade shaft and the outer wind blade shaft.

[0015] In the above technical solution, preferably, the windward surface of the first blade forms an S shape in the horizontal projection plane and is assembled by a plurality of arc-shaped blades from top to bottom.

[0016] In the above technical solution, preferably, the arc-shaped blade is fixed to the outer wind blade shaft through a fixing seat. The fixing seat is a rectangular block structure, and a horizontally arranged first fixing through hole is provided at its center. A second fixing through hole and a third fixing through hole are respectively provided on both sides of the first fixing through hole. The second fixing through hole and the third fixing through hole are respectively parallel to the first fixing through hole and are spaced apart;

[0017] A first fixing bolt passes through the first fixing through hole to fix the fixing seat on the outer wind blade shaft. The arc-shaped blade on the first blade is fixed to the fixing seat through a first fixing rod, and the arc-shaped blade on the second blade is fixed to the fixing seat through a second fixing rod.

[0018] In the above technical solution, preferably, the first fixing rod connecting the uppermost arc-shaped blade of the first blade and the first fixing rod connecting the lowermost arc-shaped blade of the first blade are parallel to each other and are spaced apart.

[0019] In the above technical solution, preferably, the lower fixing frame includes:

[0020] The lower fixing tube is sleeved and fixed on the upper part of the inner shaft of the wind blade. The lower end of the lower fixing tube has a stepped shaft with a smaller lower outer circumferential surface and a larger upper outer circumferential surface.

[0021] The lower wind blade fixing member has a bottom disc, and a plurality of upper fixing plates extending obliquely upward are provided on the outer edge thereof; the bottom disc is sleeved on the stepped shaft, and an annular sleeve is provided on the bottom surface of the bottom disc; the upper end of the support shaft seat is inserted into the annular sleeve.

[0022] The second wind blade of the outer wind blade assembly is fixed on the upper fixing plate.

[0023] In the above technical solution, preferably, the upper fixing frame includes:

[0024] The upper fixing tube is sleeved and fixed on the lower part of the inner shaft of the wind blade. The lower end of the lower fixing tube is provided with an annular flange, and an annular groove is provided on the bottom surface of the annular flange. The upper end of the outer shaft of the wind blade is inserted into the annular groove.

[0025] The upper wind blade fixing member has a top disc, and a plurality of upper fixing plates extending obliquely outward downward are provided on the outer edge thereof.

[0026] The upper end of the second wind blade is fixed on the upper fixing plate.

[0027] In the above technical solution, preferably, a fifth bearing is provided at the upper end of the outer shaft of the wind blade, and the inner wall of the annular groove abuts against the inner ring of the fifth bearing to form an axial fixing structure.

[0028] As can be seen from the above technical solution, the vertical-axis dual-drive wind power generation device provided by the present invention solves the problems of large vertical space occupation, poor stability, and low service life in the prior art. Compared with the prior art, the present invention has the following beneficial effects:

[0029] The inner wind blade and the outer wind blade assembly rotate in opposite directions, and the outer wind blade assembly is arranged around the inner wind blade assembly, sharing the same height space with the inner wind blade assembly, reducing the height of the vertical-axis power generation device, improving the stability, reducing the cost, and at the same time improving the power generation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce and explain the drawings required for describing the embodiments of the present invention or the prior art. Obviously, the drawings in the following description are only partial embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0031] Figure 1 Schematic diagram of an embodiment of the vertical-axis dual-drive wind power generation device provided by the present invention;

[0032] Figure 2 is Figure 1 The enlarged view of part A in;

[0033] Figure 3 is Figure 2 The enlarged view of part B in;

[0034] Figure 4 Schematic diagram of the inner wind blade assembly in the present invention;

[0035] Figure 5 is Figure 4 The top view of;

[0036] Figure 6 Schematic diagram of the outer wind blade assembly in the present invention;

[0037] Figure 7 Schematic diagram of the lower fixing ring in the present invention;

[0038] Figure 8 Schematic diagram of the upper fixing frame in the present invention;

[0039] Figure 9 is Figure 1 The enlarged view of part C in.

[0040] Figures 1-9 In, the corresponding relationship of the components is as follows:

[0041] Support shaft seat 10, generator 20, inner wind blade assembly 30, outer wind blade assembly 40, lightning rod 50;

[0042] Connecting flange 11, first bearing 12, second bearing 13;

[0043] Upper cover 211, lower cover 212, annular permanent magnet 213, third bearing 214, positioning ring 215, fourth bearing 216;

[0044] Outer shell 21, inner rotor 22, inner shaft of wind blade 23;

[0045] First annular boss 231, fifth bearing 232;

[0046] First blade 31, second blade 32, outer shaft of wind blade 33, fixing seat 34, first fixing bolt 35, first fixing rod 36, second fixing rod 37;

[0047] Flange 331;

[0048] Second wind blade 41, lower fixing frame 42, upper fixing frame 43;

[0049] Lower fixed pipe 421, lower wind blade fixing part 422, bottom disc 423, lower fixing plate 424, stepped shaft 425, annular sleeve 426;

[0050] Upper fixed pipe 431, upper wind blade fixing part 432, top disc 433, upper fixing plate 434, annular flange 435, annular groove 436;

[0051] Locking nut 51, locking pressing plate 52. Specific embodiments

[0052] Next, in conjunction with the attached drawings of the embodiments of the present invention, the technical solutions of the embodiments of the present invention will be clearly and completely described. Obviously, the following described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the scope of protection of the present invention.

[0053] The implementation principle of the present invention is:

[0054] The inner wind blade assembly is fixed to the outer wind blade shaft, and the outer wind blade shaft is fixed to the housing of the generator; the outer wind blade assembly is coaxially arranged around the outer periphery of the inner wind blade assembly and is fixed to the inner wind blade shaft through the upper fixing frame and the lower fixing frame. The outer wind blade shaft is coaxially sleeved outside the inner wind blade shaft, and the rotation directions of the inner wind blade assembly and the outer wind blade assembly are opposite.

[0055] The solution provided by the present invention is that the outer wind blade assembly is arranged around the inner wind blade assembly, sharing the same height space with the inner wind blade assembly, reducing the height of the vertical axis power generation device, improving the stability, reducing the cost, and at the same time improving the power generation efficiency.

[0056] In order to make a clearer explanation and illustration of the technical solutions and implementation methods of the present invention, the following introduces several preferred specific embodiments for implementing the technical solutions of the present invention.

[0057] It should be noted that the orientation words such as "inner, outer", "front, rear", and "left, right" in this article are expressed based on the product use state as the reference object. Obviously, the use of the corresponding orientation words does not constitute a limitation to the protection scope of the present solution.

[0058] Please refer to Figure 1 and Figure 2 , Figure 1 is a vertical axis dual-drive wind power generation device provided by the present invention, Figure 2 is Figure 1 The enlarged view of part A in Figure 3 is Figure 2 The enlarged view of part B in

[0059] As Figure 1 、 Figure 2 shown, a vertical-axis dual-drive wind power generation device provided by the present invention includes a support shaft seat 10, a generator 20, an inner wind blade assembly 30, and an outer wind blade assembly 40.

[0060] In this embodiment, the generator 20 is a disc-type generator, including a housing 21 and an inner rotor 22 disposed within the housing 21. The housing 21 constitutes the outer rotor of the generator 20. The inner wind blade assembly 30 drives the outer rotor to rotate, and the outer wind blade assembly 40 drives the inner rotor 22 to rotate. The inner wind blade assembly 30 and the outer wind blade assembly 40 are arranged to rotate in opposite directions, thereby causing the inner rotor and the outer rotor to rotate relative to each other, increasing the relative rotational speed between the inner and outer rotors, and improving the power generation efficiency.

[0061] Referring again to Figure 1 shown, the support shaft seat 10 is a hollow shaft structure, and its lower end has a connecting flange 11 for fixing the support shaft seat 10 to components such as a bottom bracket or a bottom base.

[0062] The support shaft seat 10 is in a vertical sleeve shape. A first bearing 12 is provided at the upper end of its shaft hole, and a second bearing 13 is provided at the lower end. The second bearing 13 is at a certain distance from the bottom surface of the support shaft seat 10.

[0063] Referring again to Figure 2 、 Figure 3 ,the housing 21 of the generator 20 is relatively combined by an upper cover 211 and a lower cover 212. Annular magnets 213 are respectively provided on the lower end surface (inner side surface) of the upper cover 211 and the upper end surface (inner side surface) of the lower cover 212. The inner rotor 22 is a disc-type winding structure formed by laminating multiple layers of sheet windings, and annular grooves are respectively provided on the upper and lower surfaces and are arranged opposite to each other. The end surfaces of the annular magnets 213 extend into the annular grooves. This design can maximize the avoidance of magnetic flux leakage from the peripheral edge of the annular magnets 213, improving the utilization efficiency of magnetic flux.

[0064] The inner wind blade shaft 23 is a hollow shaft structure. At the part located inside the generator 20, a first annular boss 231 is provided on its outer circumferential surface. The inner rotor 22 is sleeved on the inner wind blade shaft 23 and is fixed to the inner wind blade shaft 23 through a key connection structure. Moreover, the lower end surface of the inner rotor 22 abuts against the upper end surface of the first annular boss 231, and the inner rotor 22 is driven to rotate by the inner wind blade shaft 23.

[0065] A third bearing 214 is embedded at the lower end of the central shaft hole of the upper cover 211. An adjusting ring is sleeved between the inner rotor 22 and the third bearing 214 for axially limiting the inner rotor 22 and cooperatively abutting against the inner ring of the third bearing 214. The outer ring of the third bearing 214 is abutted by corresponding structures on the upper cover 211.

[0066] At the upper end of the central shaft hole of the lower cover 212, a fourth bearing 216 is embedded. The inner ring of the fourth bearing 216 abuts against the lower end surface of the first annular boss 231, and the outer ring of the fourth bearing 216 is abutted by the corresponding structure on the lower cover 212.

[0067] The upper cover 211 and the lower cover 212 are fixed at the outer edge by a plurality of bolts arranged circumferentially and evenly, and are combined to form the outer shell 21 of the generator.

[0068] The lower part of the inner shaft 23 of the wind blade is inserted into the support shaft seat 10 from top to bottom. The first bearing 12 is a thrust bearing. At the mating part of the inner shaft 23 of the wind blade and the first bearing 12, a shaft shoulder is provided. The shaft shoulder of the inner shaft 23 of the wind blade abuts against the inner ring of the first bearing 12, realizing the axial fixation of the inner ring of the first bearing 12. On the inner wall at the upper end of the support shaft seat 10, a stepped bearing hole is provided. The first bearing 12 is installed in this bearing hole and abuts against the outer ring of the first bearing 12 through the step here, realizing the axial fixation of the outer ring of the first bearing 12. The gravity transmission structure formed thereby is:

[0069] The upper weight borne by the inner shaft 23 of the wind blade is transmitted to the first bearing 12, and then transmitted to the support shaft seat 10 through the first bearing 12. All the gravity loads are borne by the first bearing 12 and the support shaft seat 10.

[0070] The lower end of the inner shaft 23 of the wind blade is inserted into the second bearing 13. The second bearing 13 does not bear the load, and is used to make the inner shaft 23 of the wind blade rotate flexibly and ensure the coaxiality. After the lower end of the inner shaft 23 of the wind blade passes through the second bearing 13 downward, a slip ring device is sleeved and axially fixed by a nut and a spring washer. The bottom surface of the connecting flange 11 is higher than the nut, so that the support shaft seat 10 forms a protection for the lower end of the inner shaft 23 of the wind blade and the slip ring device.

[0071] As Figure 4 、 Figure 5 shown, the inner wind blade assembly 30 includes a first blade 31, a second blade 32 and an outer shaft 33 of the wind blade.

[0072] The first blade 31 and the second blade 32 have the same structure and are respectively fixed on the outer shaft 33 of the wind blade through a fixing seat 34. The windward surfaces of the first blade and the second blade are arc surfaces arranged in a spiral shape, and the windward surfaces of the two are symmetrically arranged in reverse at 180 degrees.

[0073] The windward surface of the first blade 31 forms an S shape in the horizontal projection plane and is assembled from a plurality of arc-shaped blades from top to bottom. The fixing rods connecting the arc-shaped blades at the uppermost end of the first blade and the fixing rods connecting the arc-shaped blades at the lowermost end of the first blade are parallel to each other and are spaced apart.

[0074] Taking the first blade 31 as an example, the first blade 31 is composed of six arc-shaped blades from top to bottom. Two arc-shaped blades arranged oppositely on the first blade 31 and the second blade 32 are respectively fixed on the outer shaft 33 of the wind blade through a fixing seat 34.

[0075] The fixing seat 34 is of a rectangular block structure, and a horizontally arranged first fixing through hole is provided at its center. A second fixing through hole and a third fixing through hole are respectively provided on both sides of the first fixing through hole. The second fixing through hole and the third fixing through hole are respectively parallel to the first fixing through hole and are arranged at intervals.

[0076] The first fixing bolt 35 passes through the first fixing through hole to fix the fixing seat 34 on the outer shaft 33 of the wind blade. The arc-shaped blade on the first blade 31 is fixed on the fixing seat 34 through the first fixing rod 36, and the arc-shaped blade on the second blade 32 is fixed on the fixing seat 34 through the second fixing rod 37.

[0077] The arc surface bending directions of the arc-shaped blades of the first blade 31 and the second blade 32 are opposite, and two arc-shaped blades at the same horizontal position are symmetrically arranged at 180 degrees. The arc surface is the windward surface and generates a driving force under the action of the wind.

[0078] Figure 5 It is a top view projection diagram of the inner wind blade assembly. The x-axis and y-axis defined in this diagram are used to illustrate the positional relationship between the first blade 31 and the second blade. The x-axis and y-axis here are not absolute definitions.

[0079] As Figure 5 shown, for the uppermost arc-shaped blade on the first blade 31, the opening edge of its top surface is fixed to the fixing seat 34 through the first fixing rod 36. The first fixing rod 36 is parallel to the x-axis and is located above the x-axis. The distance between the first fixing rod 36 and the X-axis is s. Figure 5 In, the shaded area represents the inner wind blade assembly 30, and the blank area represents the inner wind blade assembly 30.

[0080] For the lowermost arc-shaped blade on the first blade 31, the opening edge of its bottom surface is fixed to another fixing seat 34 through another first fixing rod 36. This first fixing rod 36 is also parallel to the x-axis and is located below the x-axis. The distance between this first fixing rod 36 and the X-axis is also s.

[0081] That is, the fixing rod connecting the uppermost arc-shaped blade on the first blade 31 and the fixing rod connecting the lowermost arc-shaped blade on the first blade 31 are parallel to each other and are symmetrically arranged at intervals with respect to the x-axis.

[0082] In this design, after all the arc-shaped blades are assembled from top to bottom to obtain the first blade 31 and the second blade 32, the windward surfaces of the first blade 31 and the second blade 32 are in a helical shape in opposite directions. Wind coming from any direction can act on the first blade 31 and the second blade 32 to generate thrust, reducing the starting force of the first blade 31 and the second blade 32.

[0083] Combined with Figure 3 , a flange 331 is provided at the lower end of the outer shaft 33 of the wind blade. The bottom surface of the flange 331 is arranged on the top surface of the upper cover 211 of the generator and fixed by bolts. Thus, the outer shaft 33 of the wind blade drives the outer shell 21 of the generator to rotate, and then drives the outer rotor of the generator to rotate.

[0084] For a vertical-axis generator, since the inner shaft of the wind blade is thin and long, the outer shaft 33 of the wind blade is sleeved outside the inner shaft 23 of the wind blade. The coaxiality between the two has a great influence on the performance of the generator. Especially when only an end-face connection and fixing structure can be adopted between the outer shaft 33 of the wind blade and the outer shell 21, this fixing structure causes a large error during assembly and it is difficult to ensure a high coaxial accuracy. Therefore, the solution of the present invention adopts the following design.

[0085] Referring again to Figure 3 , a positioning ring 215 is provided around the central hole on the upper end surface of the upper cover 211. The positioning ring 215 is inserted into the gap between the inner shaft 23 of the wind blade and the outer shaft 33 of the wind blade, thereby realizing the precise positioning of the outer shaft 33 of the wind blade, improving the coaxiality between the outer shaft 33 of the wind blade and the inner shaft 23 of the wind blade, reducing losses, improving efficiency, and extending the service life.

[0086] Referring again to Figure 1 、 Figure 5 As shown, the outer wind blade assembly 40 is composed of a plurality of second wind blades 41 and fixed on the inner shaft 23 of the wind blade through a lower fixing frame 42 and an upper fixing frame 43. The outer wind blade assembly 40 is arranged around the inner wind blade assembly 30.

[0087] In this embodiment, the second wind blade 41 is in a C shape, with a total of three groups, evenly distributed circumferentially.

[0088] As Figure 6 shown, the lower fixing frame 42 includes a lower fixing pipe 421 and a lower wind blade fixing member 422 fixed on the outer circumferential surface of the lower fixing pipe 421.

[0089] The lower fixing pipe 421 is sleeved on the inner shaft 23 of the wind blade of the generator and fixed to the inner shaft 23 of the wind blade through radially penetrating bolts.

[0090] The lower wind blade fixing member 422 has a bottom disc 423, and the outer edge thereof is provided with a plurality of lower fixing plates 424 extending obliquely upward. The number of the lower fixing plates 424 is the same as that of the second wind blades 41 and is used to fix the second wind blades 41. In this embodiment, the second wind blades 41 are C-shaped and there are three in total. Therefore, there are also three lower fixing plates 424, which are evenly distributed in the circumferential direction, and the adjacent lower fixing plates 424 are arranged at an interval of 120 degrees.

[0091] The lower end of the lower fixing pipe 421 has a stepped shaft 425 with a smaller lower outer circumferential surface and a larger upper outer circumferential surface. The bottom disc 423 is sleeved on the stepped shaft 425 at the lower end of the lower fixing pipe 421. An annular sleeve 426 is provided on the bottom surface of the bottom disc 423. The annular sleeve 426 has the following two functions. First, it is used for positioning. Second, it plays a protective role for the bearing below, preventing dust and sundries from entering the bearing and prolonging the service life of the bearing.

[0092] As Figure 7 shown, the upper fixing frame 43 includes an upper fixing pipe 431 and an upper wind blade fixing member 432 fixed on the outer circumferential surface of the upper fixing pipe 431.

[0093] The upper fixing pipe 431 is sleeved on the inner shaft of the wind blade of the generator and is fixed to the inner shaft of the wind blade through a bolt radially penetrating therethrough.

[0094] The upper wind blade fixing member 432 has a top disc 433, and the outer edge thereof is provided with a plurality of upper fixing plates 434 extending obliquely outward at the lower end. The number of the upper fixing plates 434 is the same as that of the second wind blades and is used to fix the second wind blades. In this embodiment, there are three second wind blades in total. Therefore, there are also three upper fixing plates 434, which are evenly distributed in the circumferential direction, and the adjacent upper fixing plates 434 are arranged at an interval of 120 degrees.

[0095] The lower end of the upper fixing pipe 431 is provided with an annular flange 435, and an annular groove 436 is provided on the bottom surface of the annular flange 435.

[0096] As Figure 2 shown, in this embodiment, the inner shaft 23 of the wind blade is composed of two sections of the upper inner shaft of the wind blade and the lower inner shaft of the wind blade connected by threads or other means, which reduces the length of the inner shaft 23 of the wind blade during transportation and is convenient for transportation.

[0097] Moreover, in this segmented structure, in the connection structure between the upper inner shaft of the wind blade and the upper fixing pipe 431 of the outer wind blade assembly and the outer shaft 33 of the wind blade, a more concise structural form can be adopted.

[0098] As Figure 9As shown, a second shaft shoulder is provided on the outer circumferential surface of the inner shaft of the upper wind blade. The fifth bearing is installed at the upper end of the outer shaft 33 of the wind blade, and the upper end of the outer shaft 33 of the wind blade is inserted into the annular groove 436. Thus, on the one hand, the outer shaft 33 of the wind blade can be centered and limited; on the other hand, the inner wall of the annular groove 436 abuts against the inner ring of the fifth bearing 232 to form an axial fixing structure; thirdly, the outer side wall of the annular groove 436 shields the fifth bearing 232, which can prevent dust, sundries, etc. from entering the fifth bearing 232 and prolongs the service life of the fifth bearing 232.

[0099] After the upper end of the inner shaft 23 of the wind blade passes upward through the upper fixing pipe 431, a lightning rod 50 is installed, as Figure 1 shown.

[0100] The upper end of the inner shaft 23 of the wind blade is provided with an external thread, and the top disc 433 is axially limited by a locking nut 51 and a locking pressing plate 52, and presses on the inner ring of the fifth bearing 232.

[0101] In the present invention, a wiring terminal matching the slip ring assembly 60 is provided on the outer circumferential surface of the support shaft seat 10. The slip ring assembly 60 is connected to the output terminal of the generator 20 for outputting electric power. The output cable of the generator is arranged in the inner cavity of the inner shaft 23 of the wind blade.

[0102] The working principle of the vertical-axis double-drive wind power generation device provided by the present invention is as follows:

[0103] Under the action of wind force, the inner wind blade assembly 30 rotates clockwise, driving the outer rotor (outer shell 21) of the generator 20 to rotate clockwise. At the same time, the outer wind blade assembly 40 rotates counterclockwise, thereby driving the inner rotor 22 of the generator 20 to rotate counterclockwise. The inner rotor 22 and the outer rotor rotate relative to each other, improving the power generation efficiency.

[0104] Obviously, it can also be that the inner wind blade assembly 30 rotates counterclockwise and the outer wind blade assembly 40 rotates clockwise.

[0105] Based on the description of the above specific embodiments, the vertical-axis double-drive wind power generation device provided by the present invention has the following advantages compared with the prior art:

[0106] First of all, the outer wind blade assembly 40 is arranged around the inner wind blade assembly 30. Equivalent to within the same height range, the outer wind blade assembly 40 and the inner wind blade assembly 30 share the same height space, reducing the height of the vertical-axis power generation device, improving stability, reducing costs, and having a high service life.

[0107] Secondly, the inner wind blade assembly includes a first wind blade and a second wind blade that are symmetrically arranged, and the first wind blade and the second wind blade are in an S-shaped spiral from top to bottom, and even a small wind force can start, improving the starting performance of the generator.

[0108] Third, a first bearing and a second bearing are provided between the inner shaft 23 of the wind blade and the support bearing seat 10, and a fifth bearing is provided between the inner shaft 23 of the wind blade and the outer shaft of the second wind blade. This not only improves the coaxiality of the inner shaft 23 of the wind blade with the support bearing seat 10 and the outer shaft of the second wind blade, but also improves the rotational flexibility, reduces the frictional resistance, improves the efficiency of the generator, and extends the service life through the arrangement of these three groups of bearings.

[0109] Fourth, both the first bearing and the fifth bearing are provided with dust-proof structures, which can prevent dust, sundries, etc. from entering and extend the service life of the first bearing and the fifth bearing.

[0110] Fifth, a radial gap is provided between the inner shaft of the wind blade and the outer shaft of the wind blade, and bearings are installed, which improves the coaxiality, reduces friction, lowers losses, and improves the power generation efficiency.

[0111] Finally, it should also be noted that the terms "including", "comprising" or any other variants thereof used in this text are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without more limitations, an element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

[0112] The present invention is not limited to the above-mentioned optimal implementation manner. Anyone should know that structural changes made under the inspiration of the present invention, as long as they have the same or similar technical solutions as the present invention, fall within the protection scope of the present invention.

Claims

1. A vertical-axis double-drive wind power generation device, comprising a generator, an inner wind blade assembly for driving the outer rotor of the generator to rotate, and an outer wind blade assembly for driving the inner rotor of the generator to rotate. The inner wind blade assembly and the outer wind blade assembly rotate in opposite directions, and is characterized in that, the outer rotor is constituted by the housing of the generator, the inner rotor is arranged inside the housing, the inner rotor is fixed to a vertically arranged outer wind blade shaft, and the outer wind blade shaft is fixed to the housing of the generator; the outer wind blade shaft is coaxially sleeved outside an inner wind blade shaft, and there is a gap between the two; the inner wind blade assembly is fixed to the outer wind blade shaft; the outer wind blade assembly is coaxially arranged around the outer periphery of the inner wind blade assembly, and is fixed to the inner wind blade shaft through an upper fixing bracket and a lower fixing bracket; the housing of the generator is formed by relatively combining an upper cover and a lower cover. Annular magnets are respectively arranged on the lower end surface of the upper cover and the upper end surface of the lower cover. The inner rotor is of a disc-type winding structure, which is formed by laminating multiple sheet-type windings, and annular grooves are respectively arranged on the upper and lower surfaces of the inner rotor and are arranged oppositely. The end surface of the annular magnet extends into the annular groove; the vertical-axis double-drive wind power generation device further comprises a support shaft seat, which is in the shape of a vertical sleeve. A stepped bearing hole is arranged at the upper end of its shaft hole. A first bearing is installed in the stepped bearing hole, and the outer ring of the first bearing is axially fixed. A shaft shoulder is arranged at the mating part of the outer wind blade shaft and the first bearing to axially fix the inner ring of the first bearing; a second bearing is arranged at the lower end of the shaft hole of the support shaft seat, and the lower end of the outer wind blade shaft is inserted into the second bearing; the inner wind blade assembly comprises a first blade and a second blade, which are respectively fixed to the outer wind blade shaft. The first blade and the second blade have the same structure. The windward surface is an arc surface arranged in a spiral shape from top to bottom, and the windward surfaces of the first blade and the second blade are symmetrically arranged in reverse by 180 degrees; the windward surface of the first blade forms an S shape in the horizontal projection plane and is assembled by multiple arc-shaped blades from top to bottom; a flange is arranged at the lower end of the outer wind blade shaft and is fixed to the upper end surface of the upper cover through the flange; a positioning ring is arranged around the central shaft hole on the upper end surface of the upper cover, and the positioning ring is inserted into the gap between the inner wind blade shaft and the outer wind blade shaft; the lower fixing bracket comprises: a lower fixing pipe is sleeved and fixed on the upper part of the inner wind blade shaft, and the lower end of the lower fixing pipe has a stepped shaft with a lower-small and upper-large outer circumferential surface; a lower wind blade fixing member, which has a bottom disc, and a plurality of upper fixing plates extending upward and obliquely are arranged on the outer edge thereof; the bottom disc is sleeved on the stepped shaft, and an annular sleeve is arranged on the bottom surface of the bottom disc; the upper end of the support shaft seat is inserted into the annular sleeve; the second wind blade of the outer wind blade assembly is fixed to the upper fixing plate; the upper fixing bracket comprises: an upper fixing pipe is sleeved and fixed on the lower part of the inner wind blade shaft, and an annular flange is arranged at the lower end of the lower fixing pipe. An annular groove is arranged on the bottom surface of the annular flange, and the upper end of the outer wind blade shaft is inserted into the annular groove; The upper wind blade fixing member has a top disc, and a plurality of upper fixing plates with their lower ends extending obliquely outward are provided on the outer edge thereof; The upper end of the second wind blade is fixed on the upper fixing plate; A fifth bearing is provided at the upper end of the outer shaft of the wind blade, and the inner wall of the annular groove abuts against the inner ring of the fifth bearing to form an axial fixing structure.

2. The vertical-axis double-drive wind power generation device according to claim 1, characterized in that The arc-shaped blade is fixed on the outer shaft of the wind blade through a fixing seat. The fixing seat is of a rectangular block structure, and a horizontally arranged first fixing through hole is provided at the center thereof. A second fixing through hole and a third fixing through hole are respectively provided on both sides of the first fixing through hole. The second fixing through hole and the third fixing through hole are respectively parallel to the first fixing through hole and are arranged at intervals; A first fixing bolt passes through the first fixing through hole to fix the fixing seat on the outer shaft of the wind blade. The arc-shaped blade on the first blade is fixed on the fixing seat through a first fixing rod, and the arc-shaped blade on the second blade is fixed on the fixing seat through a second fixing rod.

3. The vertical-axis double-drive wind power generation device according to claim 1, wherein The first fixing rod connecting the arc-shaped blade at the uppermost end of the first blade and the first fixing rod connecting the arc-shaped blade at the lowermost end of the first blade are parallel to each other and are arranged at intervals.

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