Double-shaft urban wind turbine

Abstract

A compact wind turbine system arranged for retrogradation of an existing pole string is provided. The purpose is achieved by adopting a double-vertical-axis wind turbine in the downwind direction of the flow guide cover.

Description

Technical Field

[0001] This invention relates to the field of wind turbines, and more specifically, to a compact wind turbine suitable for retrofitting existing poles (such as light poles). Background Technology

[0002] Existing technology is embodied in traditional vertical axis wind turbines (VAWT).

[0003] The prior art can be found in USD675983S. This US design patent discloses a twin vertical Savonius-type wind turbine with twin S-shaped turbine blades positioned on the leeward side of a vertical plate. The two vertical wind turbine shafts are fixed to bearings on a lower plate-like arm structure on a supporting cylinder with a bottom attachment flange. The bottom attachment flange forms a single bearing for mounting at the top of the mast.

[0004] The applicant tested an example of USD675983 "BeWind". The tests showed that, due to the rigidity of the single bearing on its mast, the base could only withstand downward forces or winds from a single direction; it collapsed rapidly after the entire unit swayed in the wind, causing the frame to crack. Prior to the damage, the swaying caused the turbine to lose rotational momentum.

[0005] Daniel McLean's Master of Applied Science thesis, "Development of the Dual-Vertical-Axis Wind Turbine with Active Blade Pitch Control," published in *Mechanical, Industrial and Aerospace Engineering* (Concordia University, Montreal, Quebec, Canada, December 2017), explores a single vertical-axis wind turbine with parallel-axis blades and a parallel dual-vertical-axis wind turbine with vertical blades arranged between horizontally arranged conveyor belt pairs. The long side of the elliptical trajectory spans both the windward and downstream sides. McLean concludes that active pitch control can balance the load but cannot improve energy extraction. The downstream wind field on the downstream operating wing is weakened due to the wake of the upstream operating wing. Due to flow field interactions, active pitch control cannot improve the period-average power coefficient of this turbine design.

[0006] US Patent 8057159B2 relates to a dual wind turbine system comprising: (a) a first rotatable wind turbine having blades extending vertically in a radial direction around its axis; (b) a second rotatable wind turbine deployed parallel to the first turbine, having blades extending vertically in a radial direction around its axis; (c) a vertical wind deflector located on the windward side between the first and second wind turbines; (d) a windward member associated with and guiding the first and second wind turbines and the wind deflector into the wind; (e) a rotating support for mounting objects (a), (b), (c), and (d); and (f) an alternator connected to the first and second wind turbines and generating electrical energy as the first and second wind turbines rotate.

[0007] In rural and densely populated areas of South Africa, and indeed much of Africa, electrical infrastructure is often lacking or insufficient. However, light poles are commonly found along roads, providing a suitable location for wind turbines, especially in windy areas such as coastal roads and seaside promenades. Wind turbines mounted on these light poles can provide significant energy to the local area, but they are susceptible to fatigue damage. The relatively low height of most light poles results in relatively short double VAWTs (Variable Energy Wrappers), a solution being the installation of double VAWTs at the top of the pole. However, changing wind directions make fixed-position double VAWTs inefficient for most wind directions outside the dominant wind direction. Rotating base double VAWTs can orient themselves to the wind, but the rotating base is susceptible to wear and fatigue, and may break off from the top of the pole. Furthermore, the orientation of rotating base double VAWTs can be unstable and may oscillate excessively with changes in wind direction.

[0008] Horizontal axis wind turbines (HAWTs) generate tremendous noise due to their potentially very high blade tip speeds, making them highly undesirable in urban environments. Because HAWTs require large vertical wingspans to operate efficiently, they must be housed in nacelles mounted on towers, higher than the turbine itself above ground. Their locations often face "don't in my backyard" attitudes. They take up considerable space and indiscriminately kill birds. The excessive height of the nacelles also leads to high maintenance and repair costs.

[0009] Compared to typical wind farms, urban environments are subject to greater turbulence and wind direction changes. This makes statically oriented dual-axis VAWTs less practical.

[0010] Therefore, a method and system are urgently needed to overcome the above problems. Summary of the Invention

[0011] The present invention provides a wind turbine system including a shroud (1) located in front of the wind and facing the wind direction, and a pair of counter-rotating vertical axis wind turbines (VAWTs) (2) symmetrically positioned on the downwind side of the shroud, wherein the shroud (1) is positioned such that the portion of the counter-rotating VAWT that rotates against the wind direction is blocked by the shroud.

[0012] The problem to be solved by the present invention The primary objective of this invention is to provide a dual-axis vertical-axis wind turbine (VAWT) system capable of utilizing existing mechanical infrastructure. The aim is for the system to be easily assembled and installed on-site using existing infrastructure. Another objective is to enable the wind turbine system to utilize winds from different directions. Yet another objective is to mitigate the negative impact of the VAWT's active rotor on the passive rotor. A further objective of this invention is to facilitate the use of existing solar power plants or local or regional power grids.

[0013] Problem-solving methods According to the present invention, this objective is achieved by the wind turbine system defined in the independent claims.

[0014] Several non-exhaustive embodiments, variations, or alternatives of the present invention are defined by the dependent claims.

[0015] Effects of the present invention This invention offers significant advantages over the prior art: its mechanical fragility is greatly reduced. It is advantageous in the face of winds with varying directions. It is advantageous in addressing swaying issues. It offers advantages in ease of manufacture; most major components, such as the fairing, the three-arm support for securing the turbine blades, the turbine blades themselves, and the left and right combined three-lobed pole mounts, can be formed from sheet metal and support flat packaging, greatly simplifying the manufacturing process and transportation to the assembly and installation site. Another advantage of this invention is its ease of integration into solar power plants. Attached Figure Description

[0016] The above and other features of the present invention have been described in detail in the appended claims, and these features and advantages will become clearer from the following detailed description of exemplary embodiments of the present invention in conjunction with the accompanying drawings.

[0017] The present invention will be further described below with reference to the exemplary embodiments shown in the accompanying drawings, wherein: Figure 1This is an isometric projection view of an embodiment of the present invention, showing an assembled wind turbine system with a Darrieux spiral wind turbine arranged on a pole structure and rotating in opposite directions, with the direction of the incoming wind indicated. The pole structure can be made of existing materials such as steel, aluminum, or wood.

[0018] Figure 2 a, b, and c include... Figure 1 The corresponding top, side, and rear views of the assembled wind turbine system, which is also mounted on a pole structure. Figure 2 Figure a shows the incoming airflow along the horizontal axis (aH) of the wind turbine system to the fairing. The airflow is shown bypassing the right side of the fairing and flowing onto the right vertical axis wind turbine VAWT (2, 2R).

[0019] Figure 3 a, b, and c are top and side views of an embodiment of the fairing (1). The top view (3c) further shows the vertical edge of the side of the fairing bent inward at an angle greater than 90 degrees relative to the flat front plane. Figure 3 d shows the upper or lower shield bracket (83) used to fix the fairing (1) to the central three arms (8C) of the wind turbine system of the present invention.

[0020] Figure 4 This is an isometric "perspective" view of a wind turbine (2) according to an embodiment of the present invention, a Darrieux turbine with helical blades (23a, b, c) mounted on three tripods (26) on the axis of rotation. In the embodiment shown in the present invention, the helical blades are plate-shaped and can be bent into a helical shape during on-site assembly. They can be transported in a plate-like shape for easy flat packaging, or in a bent shape for simplified assembly.

[0021] Figure 5 This is an isometric "perspective" view of the pulley (4) and belt (5) drive to the generator (3, 32) according to an embodiment of the present invention. The pulley (4) mounted on the wind turbine shaft can also serve as a flywheel.

[0022] Figure 6 These are bottom and elevation views of the pulley and belt drive to the DC generator according to an embodiment of the present invention. The pulley (4) is arranged for connection to the shaft (22) of the VAWT (2), see [reference]. Figure 4 The generator (3) is arranged for mounting on a horizontally arranged three-lobed rotating rod mounting plate (8A or 8B) that holds the VAWT (2), see [link to relevant documentation]. Figure 2 a and Figure 2 b.

[0023] Figure 7AThis is a bottom view of the assembled split rotary fixture (7A or 7B) with a split bearing bolt flange ring (72A), and an elevation view of the split rotary fixture (7, 7A, 72B) according to an embodiment of the present invention. The upper right corner is an isometric view of the split rotary fixture (7A, 7B).

[0024] Figure 7B According to an embodiment of the invention, the upper and lower parts of the rod are assembled with separate rotating clamps (7, 7A, 7B). The rotating assembly of the upper and lower three-arm plates with right and left VAWTs (2) is shown arranged on the lower bearing ring (76) of the lower rotating clamp (7), and the upper bearing ring (76) is held in position by the upper fixed rotating clamp (7). In one embodiment, the lower rotating three-arm plate assembly (8) shares an electrical slip ring (72) with the lower rotating clamp (7).

[0025] Figure 7C The assembled upper and lower sectional rotating jig is shown in the isometric view and in the cross section of Figure 7B, where the components indicate that the three-arm plates (8, 8A, 8B) are assembled with a 90-degree offset.

[0026] Figure 7D The upper and lower half-body three-arm plates (8A, 8B) with protective brackets (83) before assembly are shown in the plan view and isometric view.

[0027] Figure 8 a is a side view, an axial view, and a perspective view of the split rotary clamp connecting ring (71, 71A, 71B) according to an embodiment of the present invention. The split rotary clamp connecting ring and the split rotary clamp are mounted at a 90-degree angle relative to the three-arm plate (8). Please refer to [link / reference]. Figure 1 and Figure 7C . Figure 8 b represents the axial bearing ring half (76A, 76B). See also... Figure 7A and Figure 7B . Figure 8 c represents the split plate flange bearing ring half; please also refer to [other details]. Figure 7A , Figure 7B , Figure 7C The three bearing rings are assembled with a 90-degree rotation relative to the assembled three-lobed plate (8), see [reference]. Figure 1 and Figure 7C .

[0028] Figure 9This is a top view of the torque generated by the wind when the wind direction is to the left of the horizontal centerline of the shield arm. The torque generated by the wind forms a restoring torque in the wind direction. The restoring torque of the fairing may be less than that of the turbine, thus reducing the restoring motion, keeping the fairing stable in the windward direction, and diverting the incoming airflow to the more exposed outer portions of the right and left VAWTs (2). This mechanism still works effectively even if the right and left VAWTs (2) are not synchronized.

[0029] Figure 10 The top view of an embodiment of the invention shows meshing blades (23) that rotate synchronously with the VAWT (2). Its advantage is that air resistance is further reduced in the common low-vacuum blade return region behind the fairing and between the meshing blades of the VAWT (2).

[0030] Figure 11 The bottom view is a schematic diagram of an embodiment of the present invention, which uses a common generator of two VAWTs (2), wherein the right and left pulleys (4) are synchronized via the pulley of the common generator (3).

[0031] Figure 12 Showing the split electrical slip ring (72) used in conjunction with the split rotary clamp (8) described above. See also: Figure 7B .

[0032] Explanation of reference numerals in the attached figures The following reference numerals and symbols correspond to the attached figures: Detailed Implementation

[0033] The various aspects of this specification will be described in more detail below with reference to the accompanying drawings.

[0034] This invention provides a wind turbine system, comprising: The fairing (1), which is located in the leading position and faces the wind, A pair of counter-rotating VAWTs (2) are symmetrically arranged on the leeward side of the fairing. The fairing (1) is positioned such that the portion of the counter-rotating VAWT (2) that rotates against the wind is blocked by the fairing (1), and the fairing (1) bends more than 90 degrees backward from the front of the fairing (1) at its vertical edge (11). See [link to relevant documentation]. Figure 1 .

[0035] The main idea is that the deflector (1) separates the incoming airflow into a right-side flow and a left-side flow relative to the deflector. These airflows act more on the relatively outer portions of the pair of left-side VAWTs (2L) and right-side VAWTs (2R), respectively, while leaving a wake in the relatively middle portion of the VAWTs behind the deflector (near the vertical system axis (a), see below). It is believed that this has a positive impact on the efficiency of the two VAWTs (2).

[0036] In an embodiment of the invention, the VAWT (2) is a Darrieux turbine. The turbine blades (23) are arranged on a tripod on their common shaft (22). In another embodiment of the invention, the wind turbine blades (23) are helical, such as... Figure 1 , Figure 2 and Figure 4 As shown.

[0037] Spiral wind turbine blades can be like Figure 1 The two spirals are shown in opposite directions, forming a pure mirror image. Alternatively, the two spirals can be arranged with the spirals pointing in the same direction, i.e., the left VAWT (2B) is "reversed" relative to the right one.

[0038] In an embodiment of the invention, the helical wind turbine blades (23) on the right VAWT (2R) point in the opposite direction to those on the left VAWT (2L), as shown in the image. Figure 1 and Figure 2 As shown.

[0039] In an embodiment of the invention, each helical blade (23) has a laterally extending protruding fin (24) at one end. See also Figure 4 These protruding fins will be differentially exposed to the incoming wind and may help start the wind turbine.

[0040] In an embodiment of the invention, the wind turbine system is rotatably positioned about a vertical system axis (a), see [link to relevant documentation]. Figure 1 The vertical system axis (a) is positioned between the shroud (1) and the pair of VAWTs (2), and the shroud (1) facilitates the rotation and alignment of the wind turbine system about the system axis (a), thereby keeping the shroud (1) facing the wind direction. See [link to relevant documentation]. Figure 9 .

[0041] In an embodiment of the invention, the pair of counter-rotating VAWTs (2) and the fairing (1) are mounted and surround the rod post, so that axis (a) lies within the axis of the supporting rod post. See [link to relevant documentation]. Figure 2 .

[0042] As an example of a pole for mounting the wind turbine system of the present invention, it can be arranged on light poles, utility poles, or other poles, such as fence posts associated with existing solar power plants. The advantage is that no separate structure needs to be built, as road lighting infrastructure is more or less available free of charge. The wind turbine system and solar system of the present invention can work complementaryly; if the sun sets or it is raining heavily, the wind may be blowing, and if there is no wind, the sun may be shining brightly, so more electricity can be obtained in either case.

[0043] In an embodiment of the present invention, the flow deflector (1) is arranged vertically and parallel to the axis of the VAWT (2). Please refer to [link to relevant documentation]. Figure 2 The lower left and lower right diagrams show the fairing (1) and its mounting bracket (83) as follows. Figure 3 As shown.

[0044] According to the invention, the fairing (1) is folded back more than 90 degrees at its vertical edge (11) relative to the plane of the main horizontal axis (aH) penetrating the wind turbine system, see [link to relevant documentation]. Figure 2 The top left part, i.e., the top transparent view.

[0045] In an embodiment of the present invention, the vertical extension length of the deflector (1) is greater than that of the VAWT (2), thereby forming a low-pressure "blade return" region behind the deflector (1). Please refer to [link to relevant documentation]. Figure 2 The upper left part (horizontal section) and the lower right part (rear elevation view).

[0046] In an embodiment of the invention, the two VAWTs (2) are positioned such that the periphery of each VAWT (2) at least partially overlaps, thereby causing the VAWT blades (23) to engage in the "blade return" region behind the fairing (1). See [link to relevant documentation]. Figure 10 (Note that in all other figures in this application, the blades (23) are not engaged.) In one embodiment, the generator (3) is driven by at least one of the VAWTs (2), see [link to relevant documentation]. Figure 2 Elevation view in the lower right corner. Figure 5 An isometric perspective view showing the pulley (4) and belt (5) on the shaft (22) of the VAWT (2) transmitting power to the corresponding pulley on the generator (3, 32). In one embodiment, the opposing VAWT (2) has a mirror-image arrangement.

[0047] In an embodiment of the invention, each VAWT (2) has a flywheel. Figure 5 and Figure 6In the illustrated embodiment, the flywheel is composed of a pulley (4), which functions as a flywheel. The flywheel helps to stabilize the rotational speed of the VAWT (2). The VAWT itself also functions as a flywheel.

[0048] exist Figure 5 and Figure 6 In the embodiment shown, the pulley (4) is much larger than the corresponding generator pulley, so the generator rotor speed will be correspondingly higher. This is advantageous for the voltage generated by the generator (3).

[0049] In an embodiment of the present invention, the generator (3, 3D) is a DC generator.

[0050] In another embodiment, the DC generator (3, 3D) is connected to the DC battery system (6).

[0051] In another embodiment, the DC battery system (6) is also a DC battery system (6, 6S) for a solar panel power station.

[0052] The advantage of using one or more DC generators (3, 3D) is that the generated DC output voltage (V) can be... DC G The voltage (V) is fed into the receiving battery pack (6), at which point it is only necessary to ensure that the generated voltage (V) is supplied. DC G It is always higher than the battery pack voltage (V). B If the wind is too weak, it cannot directly generate a sufficiently high voltage, resulting in insufficient DC voltage (V). DC G It can be passed through an inverter / transformer to generate a voltage that is always higher than the battery pack voltage (V). B The voltage (V) generated after the conversion is DC T ).

[0053] With the generated voltage (V) DC G或T The related issues are very similar to those of solar power plants, where the DC voltage (V) generated by the solar panels... s The voltage (V) generated by the wind turbine system may also vary, and is typically supplied to the battery pack via a voltage regulator. DC G或T It can be fed into the battery pack of an existing solar panel array and controlled in the regulator system of such solar panel array battery packs.

[0054] In addition, if the task is to supply power to the local or regional AC grid, the voltage from the battery pack (V) B It can be passed through an inverter system to form single-phase or three-phase voltages (V). AC ( ) and AC frequencies and phases adapted to the local single-phase or three-phase power grid to be matched.

[0055] In one embodiment of the invention, the generator (3, 3A) is an AC generator if the downstream system requires only AC power. This may be less advantageous because further speed control or inversion of the instantaneous frequency to a frequency (and voltage) acceptable to the grid is required. Controlling the speed of the VAWT (2) to directly match the received AC grid is disadvantageous because braking may be required, which wastes energy.

[0056] In embodiments of the present invention, such as Figure 1 , Figure 2 As shown, each VAWT (2) is connected to its respective generator (3, 32).

[0057] In one embodiment, the blade (23) has an airfoil profile, but as Figure 4 The implementation of the flat airfoil profile shown is also possible, largely due to the presence of the fairing (1).

[0058] There are two alternatives: either Figure 2 In the embodiments shown in B and 2C, the shaft (22) of each VAWT (2) is driven to its respective independent generator (3, 32) via pulley (4) and belt (5); or the shafts (22) of both VAWTs (2) are driven to a common generator (3, 31) via pulley (4) and belt (5), see See Figure 11 .

[0059] Using a single common generator (3, 31) or two generators (3, 32), regardless of whether the counter-rotation of the two VAWTs (2) is synchronized, has the advantage of generating a righting moment for the wind turbine system, causing the wind turbine system to steer towards the incoming wind direction. See [link to relevant documentation]. Figure 9 The left and right wind turbines (2R, 2L) can be synchronized or asynchronous. If the wind is blowing from the right side of the horizontal centerline (aH), the right wind turbine (2R) is exposed to the incoming wind more than the left wind turbine (2L), therefore the right turbine will brake against the wind, while the left turbine will "push" the wind. See [link to relevant documentation]. Figure 9 The upper part. Therefore, the torque acting on the left "leeward" VAWT (2L) is lower than the torque acting on the right "frontal" VAWT (2R): And establish a relatively weak righting moment. Facing the direction of the incoming wind.

[0060] In one embodiment, synchronization is achieved via a timing belt, a shared-drive generator, a single-drive belt, or a similar method. The advantage of synchronization is that if the wind is blowing from one side, it makes driving the VAWT on the windward side more difficult and driving the VAWT on the leeward side easier, thus causing the shrouded wind turbine system to rotate in the wind direction. Furthermore, the synchronized speed of the generators (3) of the wind turbine system simplifies the electrical system because there is no voltage difference between the left and right generators.

[0061] In an embodiment of the invention, each VAWT (2) drives a corresponding portion of the counter-rotating generator (3, 30), see [link to relevant documentation]. Figure 11 This refers to a generator (3, 30) in which one turbine shaft rotates the rotor and the other turbine shaft rotates the stator (rotatable stator). The advantage of using a counter-rotating generator (3, 31c) is that the relative speeds are twice the sum of the stator's rotation in one direction and the rotor's rotation in the opposite direction, thus allowing for a smaller generator or the generation of higher voltages, thereby reducing the requirements for conductor cross-sections. The drive belt (5) of the right-hand VAWT (2) drives the rotor, while the drive belt (5) of the opposite VAWT (2) on the left drives the generator's rotatable stator (3, 30). See [link to relevant documentation]. Figure 11 .

[0062] In one embodiment, the wind turbine system of the present invention is assembled as follows: The method of the present invention This invention also provides a method for assembling a wind turbine system; please refer to [link to relevant documentation]. Figure 1 .

[0063] In general, the present invention provides a method for assembling a wind turbine system as follows: -Provide poles; -Establish an assembled split rotating clamp with a bearing at the top at the first lower horizontal position of the rod column. - Assemble the right and left turbines onto the left, right, upper, and lower three-arm plates, respectively. - The right and left turbine assemblies are arranged and connected around the rod column.

[0064] -In the assembled upper rotating clamp at the horizontal position of the upper turbine, the upper three-arm plate is axially locked. - Install the fairing. Connect the generator to the rotating component, and connect the rotating component to the voltage receiving system. - Release the wind turbine system to make it rotate and enter the wind.

[0065] Now, VAWT will begin to rotate in reverse, and the wind turbine system will begin to generate electricity.

[0066] A more detailed method is as follows: Before assembly, a suitable vertical pole (10) is provided as a support structure for the wind turbine system. This pole can be a lamppost or the like, made of materials such as steel, aluminum, fiberglass, or wood. This is an advantage of the invention: it may be possible to install the wind turbine system of the invention without investing in a new support structure.

[0067] A more detailed implementation of the method includes the following steps: i) At the lower horizontal attachment point of the rod, assemble and fix the half-body (7A, 7B) of the lower rotating clamp (7) around the rod. See [link to relevant documentation]. Figure 7B Assemble the halves (76A, 76B) of the split axial bearing ring (76) at the top of the lower rotating clamp (7), see also Figure 7B and Figure 8 ,as well as Figure 7A Perspective view in the upper right corner.

[0068] ii) Assemble the upper rotating clamp (7) around the rod post and temporarily attach it to the upper attachment level directly above the rod post, see [link to previous section]. Figure 7B The upper part is provided with sufficient clearance to allow for the assembly of the upper and lower plates (8) that carry the VAWT (2) in the middle. "Straight above" means that there should be enough space between the lower and upper clamps for inserting the VAWT assembly so that the upper clamp can be lowered to lock the rotating assembly, see below.

[0069] iii) Assemble the right and left vertical axis wind turbines (VAWT) (2, 2A, 2B) in the upper and lower bearing seats (25) on the right, left, upper and lower three-arm plate halves (8A, 8B), see [link to relevant documentation]. Figure 7D The generator and pulleys can be installed at any time thereafter to reduce lifting weight. Position the right and left assemblies at a height level between the lower and upper rotating parts (7) on both sides of the pole, see [reference needed]. Figure 7B And secure it in place with straps or temporary clamps.

[0070] iv) Join the lower right and left three-arm plate halves (8, 8A, 8B) and join the upper right and left three-arm plate halves (8, 8A, 8B) around the rod post to form a complete upper and lower three-arm plate (8), at which point the three-arm plate retains the right and left VAWT (2), see Figure 7B .

[0071] In one embodiment, the first and left three-arm plate halves (8A, 8B) are bolted together in the following manner: - Use first and second split plate connecting rings (71A, 71B) on the proximal side (turbine side) of each three-arm plate (8). -Using the first and second split plate-type connecting rings (71A, 71B), and - Use split flange bearing rings (77A, 77B) on the distal side of each three-arm plate (8). For each fixture (7), please refer to Figure 7B Bolt holes have been pre-drilled.

[0072] v) Install the fairing (1) onto the aligned upper and lower center arms (8C) of the assembled three-arm plate (8). Install the fairing (1) onto the center arm (8C) (see Figure 2 a) On the shield bracket (83) (see Figure 3 ).

[0073] vi) Lower the assembled lower three-arm plate (8) onto the lower rotating fixture (7), see below. Figure 7B At this time, the lower rotating clamp supports the assembled VAWT (2, 2A, 2B) with the deflector (1). The assembled lower three-arm plate (8) is lowered onto the assembled axial bearing ring (76) on top of the lower rotating clamp (7).

[0074] vii) Lock the upper part (72) of the electrical slip ring to the lower three-arm plate (8) and connect it to the generator (3), see Figure 7B .

[0075] viii) Lock the lower part of the electrical slip ring to the lower clamp (7) and connect it to the voltage receiving device (6), see Figure 7B .

[0076] ix) Lower the upper rotating clamp (7) onto the upper three-arm plate (8), and fix the upper rotating clamp (7) at the horizontal attachment point on the upper part of the rod column, see [reference]. Figure 7B The upper part. This step can be performed at any time after step (vi).

[0077] Then, we can let the vertical axis wind turbine (VAWT) (2) with the shield (1) swing into the wind direction to generate electrical energy for the voltage receiving device (6).

[0078] To provide an indication of the dimensions of the wind turbine system of the present invention, in an embodiment of the invention, each vertical axis wind turbine (2) has a width of 606 mm and an axial length of 1370 mm. The illustrated embodiment is used for mounting on a pole with a radius of 56 mm and a diameter of 112 mm. In other embodiments, the VAWT diameter can be 0.5 to 2 meters or greater, and the axial length can be 1 to 4 meters or greater. The limiting factors for the dimensions of the wind turbine system of the present invention are, of course, the structural strength of the pole on which the wind turbine system is to be installed, and the reasonably expected wind speed. These are considerations that those skilled in the art need to take into account.

[0079] The advantage of this invention is that it eliminates the need for meteorological measurements to determine the prevailing wind direction. The wind turbine system can operate regardless of changes in the incoming wind direction. In an embodiment of this invention, an electric heating element (15) may be provided on the back of the fairing (1) to prevent ice and snow blockage, thereby maintaining stability in cold conditions, where the rotating VAWT would otherwise remain ice-free on its own.

[0080] A major drawback of most existing horizontal-axis wind turbines is the noise generated by their high tip speeds. These high-speed wind turbines (HAWTs) are typically very large and mounted on extremely tall towers, not uncommon to exceed 100 meters, and due to noise and visual disturbance, there is a growing desire to keep them away from residential areas. The present invention, in most embodiments, is relatively small and produces very little noise. Furthermore, the constant turbine profile is less visually disruptive than that of a rotating three-bladed horizontal-axis turbine.

[0081] Most components of the wind turbine system of this invention can be made of aluminum sheet, except for the generator (3), the upper and lower rotating clamps (7), the shaft and pulley of the VAWT (2). Even the VAWT blades can be made of flexible aluminum sheet. Therefore, most of the wind turbine system can be flat-packed and transported in a very small volume, while the generator, pulleys and clamp halves are packed in boxes. The embodiment of this invention will weigh less than about 80 to 100 kg after assembly, so all components (each of the two main halves containing the VAWT (2), with a lifting weight of less than 40 kg, less than half the total weight) can be operated by one person, and two people will assemble these components and perform the above installation process without any problems, using minimal or no lifting machinery. One or more such wind turbine systems can be installed on one or more existing light poles or utility poles along the route.

[0082] The design of two layers of rotating clamps on the rod reduces the bending moment acting on either rotating clamp (7, 7), thereby preventing fatigue of either rotating clamp and overcoming significant problems of the prior art. It also avoids swaying and minimizes the possibility of breakage.

[0083] In an embodiment of the invention, one or more of the rotating clamps of the wind turbine system have at least one separate electrical slip ring (72) connection from the output of the generator (3). See also Figure 12 , Figure 7B An electrical conductor is connected from the electrical slip ring (72) to the voltage receiving device (6). A hole may be made in the pole to allow the electrical conductor to pass through the slip ring (72) into the inside of the pole, connecting upwards to the power grid lines on the pole or downwards to the buried power grid lines.

[0084] If the generator (3) is a DC generator (3, 3D), then strictly speaking, each generator (3, 3D) only needs one electrical slip ring (72) for its "positive" voltage, and the "ground" or "negative" voltage signal can be transmitted directly to the pole (if it is a steel pole) through the structural support, and the receiving battery system can be grounded in a similar way.

Claims

1. A wind turbine system, comprising: The fairing (1) is located in the leading position and faces the wind direction; A pair of counter-rotating vertical axis wind turbines (VAWT) (2) are symmetrically positioned downwind of the fairing. The deflector (1) is positioned such that the portion of the VAWT (2) rotating against the wind direction is blocked by the deflector (1), and is further characterized in that... The fairing (1) bends more than 90 degrees backward from the front of the fairing (1) at its vertical edge (11).

2. The wind turbine system according to claim 1, The wind turbine system is positioned by rotation around the vertical system axis (a). The vertical system axis (a) is positioned between the fairing (1) and the pair of counter-rotating VAWTs (2). The deflector (1) therein helps to rotate the wind turbine system about the system axis (a) and align the wind turbine system such that the deflector (1) remains in the direction facing the wind.

3. The wind turbine system according to claim 1 or 2, wherein the pair of counter-rotating VAWTs (2) and the fairing (1) are mounted or arranged on and around the mast.

4. The wind turbine system according to any one of the preceding claims, wherein the fairing (1) is arranged vertically and parallel to the axis of the pair of counter-rotating VAWTs (2).

5. The wind turbine system according to any one of the preceding claims, wherein the vertical extension length of the shroud (1) is greater than that of the pair of counter-rotating VAWTs (2), thereby forming a low-pressure "blade return" region behind the shroud (1).

6. The wind turbine system of claim 5, wherein the pair of counter-rotating VAWTs (2) are positioned such that the periphery of each VAWT at least partially overlaps, such that the VAWT blades engage in the "blade return" region behind the fairing (1).

7. The wind turbine system according to any one of the preceding claims, wherein the generator (3) is driven by at least one VAWT (2).

8. The wind turbine system according to claim 7, wherein the generator (3, 3D) is a DC generator.

9. The wind turbine system according to claim 8, wherein the DC generator (3, 3D) is connected to the DC battery system (6).

10. The wind turbine system according to claim 9, wherein the DC battery system (6) is a DC battery system (6, 6S) of a solar panel power station.

11. The wind turbine system according to any one of the preceding claims, wherein each VAWT (2) is connected to its own generator (3, 32).

12. The wind turbine system according to any one of the preceding claims, wherein each VAWT (2) is connected to a common generator (3, 31).

13. The wind turbine system of claim 8, wherein each VAWT (2) drives a corresponding portion of the counter-rotating generator (3, 30).

14. The wind turbine system according to any one of the preceding claims, wherein each VAWT (2) is a Darrieux wind turbine.

15. The wind turbine system according to any one of the preceding claims, wherein the wind turbine blades (23a, 23b, 23c) of the pair of counter-rotating VAWTs (23) are helical.

16. The wind turbine of claim 15, wherein the helical wind turbine blades (23a, 23b, 23c) are oriented opposite to the left VAWT (2L) on the right VAWT (2R).

17. The wind turbine system according to any one of claims 7 to 13, wherein each VAWT (2) is equipped with a pulley (4) and a belt (5) for driving the generator (3).

18. The wind turbine system of claim 17, wherein each VAWT (2) is equipped with a flywheel (4, 4F) for achieving rotational inertia stability.

19. The wind turbine system of claim 18, wherein the flywheel is formed by the pulley.

20. The wind turbine system according to any one of the preceding claims, wherein the right and left VAWTs (2, 2R, 2L) and the fairing (1) are mounted on two or more split rotating clamps (7) having first and second half-body clamps (7A, 7B) for rotating about the rod, the rotating clamps (7) being arranged at two different height levels of the rod (10).

21. The wind turbine system of claim 20, wherein one or more of the rotating clamps are connected with at least one separate electrical slip ring (72, 72A, 72B) from the output end of the generator (3).

22. The wind turbine system according to claim 20 is equipped with right and left half-body three-lobed rod mounting plates (8A, 8B) with split rotating clamps (7, 7A, 7B) and bearings (81R, 81L) for the turbine shaft (22) and brackets (83) for the fairing (1).

23. The wind turbine system according to any one of the preceding claims, wherein the pair of counter-rotating VAWTs (2) rotate synchronously.

24. A method for assembling a wind turbine system, Includes the following steps: i) Horizontally assemble and fix the lower rotating clamp (7) half (7A, 7B) around the lower part of the rod post, and assemble the split axial bearing ring (76) half (76A, 76B) on the top of the lower rotating clamp (7). ii) Assemble the upper rotating clamp (7) around the rod and temporarily attach it to the upper attachment level directly above the rod. iii) Assemble the right and left vertical axis wind turbines (VAWT) (2, 2A, 2B) into the upper and lower turbine bearings (25) of the upper and lower three-arm plate halves (8A, 8B) on the right and left sides. iv) Combine the lower three-arm plate halves (8, 8A, 8B) on the right and left sides and combine the upper three-arm plate halves (8, 8A, 8B) on the right and left sides around the post to form the upper and lower three-arm plates (8) that at this time maintain the integrity of the right and left VAWT (2). - The first and left three-arm plate halves (8A, 8B) are bolted together in the following manner: - Use first and second split plate connecting rings (71A, 71B) on the proximal side of each three-arm plate (8). -Use first and second split plate connecting rings (71A, 71B) and split plate flange bearing rings (77A, 77B) v) Install the fairing (1) onto the aligned upper and lower center arms (8C) of the assembled three-arm plate (8). - The flow guide (1) is mounted on the shield bracket (83) on the center arm (8C). vi) Lower the assembled lower three-arm plate (8) onto the lower rotating clamp (7), and at this time use the fairing (1) to support the assembled VAWT (2, 2A, 2B). - Place the assembled lower three-arm plate (8) on the assembled split axial bearing ring (76) on top of the lower rotating clamp (7), vii) Lock the upper part of the electrical slip ring to the lower three-arm plate and connect it to the generator (3). viii) Lock the lower part of the electrical slip ring to the lower rotating clamp (7) and connect it to the voltage receiving device (6). ix) Lower the upper rotating clamp (7) onto the upper three-arm plate (8) and fix the upper rotating clamp (7) to the upper attachment horizontal on the rod column.

Images