Wind turbine rotor, wind turbine rotor module, wind panel having wind turbine rotor module, method of manufacturing wind turbine rotor

Abstract

The subject of the invention is a wind turbine rotor (1) for a wind turbine having a vertical axis of rotation, the rotor comprising a plurality of rotor blades (2) equidistantly spaced from each other. The invention relates to a wind turbine rotor (1), the rotor being essentially in the shape of a longitudinal corrugated tube, the corrugations of which are blades (2), and each blade (2) being formed by a shorter wall (3) and a longer wall (4), where said shorter wall (3) and longer wall (4) of the blade (2) define an inner space (14) of the wind turbine rotor (1), and the cross-section of the rotor (1) forming a closed pattern. The subject matter of the invention is also a wind turbine rotor (1) module comprising a wind turbine rotor (1) of the invention and a wind panel comprising at least three wind turbine rotor (1) modules of the invention. The invention further relates to a method for producing a wind turbine rotor (1) according to the invention.

Description

[0001] The subject of this invention is a wind turbine rotor for a wind turbine with a vertical axis of rotation, a wind turbine rotor module, a wind panel having the wind turbine rotor module, and a method for manufacturing the wind turbine rotor, which converts the kinetic energy of wind, particularly low-speed wind, into electrical energy. Furthermore, this invention can be used as fencing for property, roads, or urban spaces. It can be installed on building roofs and anywhere wind energy can be converted into electrical energy.

[0002] Obtaining electricity from renewable energy sources is a crucial element of current energy management. So-called "clean energy," such as solar, wind, hydropower (rivers, tides, and ocean waves), or geothermal energy, is particularly important because these resources are replenished in relatively short periods and their use is environmentally friendly. However, environmental conditions in different parts of the world are not always favorable enough to allow for the free use of renewable energy. With regard to wind, a common obstacle is its low speed, making it difficult to efficiently utilize for electricity production. This is because converting low wind speeds into electricity is associated with the need to increase the effective surface area of ​​wind turbines. On the other hand, increasing the surface area of ​​wind turbines increases their manufacturing costs.

[0003] In existing technology, wind turbines are known to convert low-speed wind kinetic energy into electrical energy. However, such wind turbines have relatively small working surfaces, and their manufacture is a lengthy and complex process. Furthermore, these devices are inefficient, which often makes their use uneconomical.

[0004] US Patent document US8912679B2 discloses a modular wind turbine system having conductive structural tracks supporting the wind turbine. The wind turbine drives a generator, which is connected to two parallel tracks at its upper and lower ends. Individual modules are electrically and mechanically connected to adjacent modules. Electrical energy generated by the generator is transmitted to the location where it is consumed or used for forward transmission. The wind turbine is an elongated strip with a vertical axis of rotation. The wind turbine system is mounted on a frame at a height above the ground surface.

[0005] Spanish patent document ES1249377U relates to a wind-powered panel that generates electricity using wind power. The disclosed panel includes multiple conical wind turbine rotors driven by wind. The rotors are aligned side-by-side in a straight line or zigzag pattern. Each rotor is connected to an alternator and mounted on a support plate perpendicular to the rotor axis. The system is a cuboid structure with two spaces. The upper space is for the rotors and is equipped with holes for receiving wind, while the lower space is for the alternator.

[0006] US Patent document US8536720B2 describes a wind energy device consisting of multiple modular wind energy units or modules. Each module has a housing and at least two turbines mounted on the housing. Each turbine has a blade assembly having a vertical axis and extending upward from the housing. A generator is disposed within the housing and connected accordingly to the turbine. When these modules are placed together, their electrodes (positive and negative) are connected to complete a circuit.

[0007] US Patent document US20180171981A1 discloses an integrated modular wind turbine that can operate at both high and low wind speeds. The individual modules of the wind turbine are arranged in either a horizontal or vertical orientation. The module of this invention includes two circular, non-rotating stators, two circular rotors, and a plurality of turbine blades, wherein at least one magnet is attached to each rotor. The turbine blades are curved planes, and the turbine blades are attached to the rotors through their ends. The rotors containing the magnets rotate about the central axis of the module in proximity to conductive coils, thereby generating a rotating magnetic field. Therefore, each module of the wind turbine generates electrical energy.

[0008] This invention aims to address the underlying technical problems by providing a wind turbine rotor, a wind turbine module, and a wind power panel, which will enable the efficient conversion of low-speed (1 m / s-4 m / s) wind energy into electrical energy. Furthermore, it is desirable that the wind turbine rotor, wind turbine module, and wind power panel have a durable structure and be weather-resistant. It is also desirable that the materials used to manufacture the wind turbine rotor are widely available and their acquisition does not involve high capital expenditure. Additionally, it is desirable that the wind power panel is an environmentally friendly device that converts energy from renewable energy sources into electrical energy as efficiently as possible. It is also desirable that the operation of the wind turbine rotor, wind turbine module, and wind power panel is safe and does not adversely affect human activities, allowing these components to be installed in urban spaces. Furthermore, it is desirable that the method for manufacturing the wind turbine rotor is quick and uncomplicated, requiring minimal capital expenditure.

[0009] The first subject of this invention is a wind turbine rotor for a wind turbine having a vertical axis of rotation, the rotor comprising a plurality of rotor blades spaced equidistant from each other. The rotor is substantially in the shape of a longitudinally pleated tube, the pleats being the blades. In the context of this invention, "pleated" refers to a pattern of regular folds formed by indentations in the blade shape of the rotor of this invention. Each blade is formed by shorter and longer walls, wherein the shorter and longer walls of the blade define the internal space of the wind turbine rotor, and the cross-section of the rotor forms a closed shape. Therefore, when the rotor is in use, it moves due to wind forces acting on the outer surfaces of the blade walls.

[0010] Preferably, the rotor has a cover that closes its upper end. The cover can tightly close the upper end of the rotor, or the fastening of the cover can provide slots for free heat dissipation. The cover protects the interior of the rotor, for example, preventing rainwater from entering the rotor.

[0011] Preferably, the shorter blade wall and the longer blade wall are convex.

[0012] Preferably, the number of blades on the wind turbine rotor is not even.

[0013] Particularly preferred is that the number of blades on the wind turbine rotor is 3, 5 or 7.

[0014] Preferably, the rotor is made of plastic, a mixture of plastic and secondary plastic, or aluminum. These materials can be easily shaped by extruding an endless web of material.

[0015] Preferably, the outer surface of the rotor is coated with a semiconductor photovoltaic material, such as monocrystalline silicon, polycrystalline silicon, or perovskite material.

[0016] Preferably, at least a portion of the rotor's internal space is filled with sound-insulating material, such as polyurethane, polyethylene, or mixtures thereof.

[0017] The subject of this invention is also a wind turbine rotor module, which includes the wind turbine rotor of this invention. Within the internal space of the wind turbine rotor are arranged a generator mounted on a fixed turbine shaft, a lower inner bearing for ensuring the rotor rotates about the fixed turbine shaft, and an upper inner bearing arranged on the fixed turbine shaft in a region from half the height of the fixed turbine shaft to its upper end.

[0018] The subject of this invention is also a wind power panel comprising at least three wind turbine rotor modules of this invention, wherein the modules are mounted on a lower support track.

[0019] Preferably, the wind turbine rotor module is connected to the lower support rail via a fixed turbine shaft.

[0020] Preferably, the panel further includes an upper support rail, wherein an upper inner bearing is attached to the upper support rail.

[0021] Furthermore, the subject of this invention is a method for manufacturing the wind turbine rotor of this invention, the method comprising the following steps: a) Feeding raw materials to the extruder. b) Heating the raw materials to obtain the plastic state of the material. c) The plastic material is pushed through a forming head, which shapes the material into a profile as a longitudinally pleated tube. The pleats of the profile are blades, and each blade is formed by a shorter wall and a longer wall. The shorter and longer walls of the blade define the hollow internal space of the profile, and the cross-section of the profile forms a closed shape. d) Cut the obtained profile to the preset length.

[0022] Therefore, as a result, the material roll is extruded into a predetermined shape of a hollow, pleated tube, wherein the "pleats" are indentations on the sidewalls of the rotor blades of the present invention. The material roll thus produced is cut to a predetermined length. Components such as sound insulation materials, generators, and bearings can be easily positioned within the hollow interior space of the rotor thus produced.

[0023] Preferably, the raw material is plastic, a mixture of plastic and recycled plastic, or aluminum.

[0024] Preferably, the amount of secondary plastic is at least 30% by weight of the total material.

[0025] Preferably, the plastic is PVC, PP, and / or PE.

[0026] Wind turbine rotors, wind turbine rotor modules, and wind power panels enable the efficient conversion of low-speed wind energy into electrical energy. The absence of free space between the rotor blades means that wind directly impacts the windward surface of the blades, thus utilizing more wind energy than a standard wind turbine rotor. This rotor structure provides an increased effective surface area compared to solutions known in the prior art. In the wind power panel of this invention, airflow flows between the rotors (rather than between the free spaces between the blades), thus increasing its speed while ensuring more efficient operation of the device. Furthermore, the sidewalls of the rotor can be coated with a material that converts solar or thermal energy into electrical energy, further enhancing the device's efficiency. Due to the small diameter of the rotor, the rotor blades achieve relatively low angular velocities, resulting in quiet and flicker-free rotor operation. This means that the operation of the wind turbine rotor does not cause the effect of the blades casting shadows, which can be very disturbing at high frequencies. Additionally, with the internal space of the rotor filled with sound-absorbing material, the turbine can also act as a sound barrier to absorb environmental noise. Therefore, the operation of wind turbine rotors, wind turbine rotor modules, and wind power panels is silent and does not affect human activities, thus allowing the equipment to be installed in urban spaces. Furthermore, in urban spaces, wind power panels can be used as fencing.

[0027] Placing the rotating mechanism components inside the rotor increases the durability of the rotor modules and improves their resistance to external conditions. Mounting the wind turbine rotor on a single fixed turbine shaft ensures that the rotor is firmly and permanently held in its intended position. Utilizing the flexible printed circuit board (PCB flex) of the generator stator used to construct the rotor modules allows for greater generator resistance and enables higher rotational speeds. Placing the generator inside the wind turbine rotor allows each rotor module in the wind turbine panel to operate independently. Furthermore, the lightweight nature of the wind turbine rotor modules allows them to be supported by sliding bearings, further extending the equipment's lifespan. Additionally, due to the equipment's light weight, any accidental contact between the wind turbine rotor blades during operation will cause the rotor to stop easily and without danger. The individual modules of the wind turbine panel are arranged on a support rail while maintaining structural stability, reducing the workload and cost of manufacturing the wind turbine panels. Furthermore, using only a single support rail, the wind turbine panel modules can absorb the impact of animals, for example, by deflecting and returning to their working position, without damaging the structure or harming the animals. Moreover, attaching the wind turbine panel to the ground or building foundation ensures its stable positioning.

[0028] The manufacture of wind turbine rotors utilizes readily available plastics in the extrusion process. This ensures that the method used to manufacture the rotors is quick and easy, requiring minimal capital expenditure, and results in rotors characterized by high durability against mechanical damage and climatic conditions. Furthermore, the rotor material can also be a mixture of plastics and recycled plastics or other waste materials, further reducing manufacturing costs.

[0029] The solution according to the invention is presented in the following embodiments and is shown in the accompanying drawings, wherein Figure 1A An embodiment of a wind turbine rotor is shown in an isometric view. Figure 1B It shows Figure 1A The cross-section of a wind turbine rotor. Figure 2 A structural diagram of a wind turbine rotor module is shown. Figure 3 An exploded view of an embodiment of the wind power panel is shown. Figure 4 A wind power panel according to another embodiment is shown. Figure 5 A cross-section of a wind turbine rotor according to another embodiment is shown. Figure 6A A wind turbine rotor according to another embodiment is shown in an isometric view, and Figure 6B The cap is shown closing its upper end. Figure 6A The rotor.

[0030] The blades 2 of rotor 1 have a longitudinal shape and define the sidewalls of the rotor. Therefore, it can be said that the sidewalls defined by the wind turbine rotor blades are a consistent longitudinal structure with a substantially annular cross-section, defining the closed internal space of the wind turbine rotor. The wind turbine rotor 1 is substantially in the shape of a longitudinally pleated tube, where the "pleats" are indentations on the sidewalls in the shape of the rotor blades of the present invention. Each blade is formed by a shorter wall 3 and a longer wall 4. The outer surface of the longer wall 4 of each blade is the leeward surface of the rotor, and the outer surface of the shorter wall 3 of each blade is the windward surface of the rotor. Therefore, it can be said that the windward surface of the blade extends from the trailing edge 5 of the previous blade to the leading edge 6 of the current blade, and the leeward surface of the blade extends from the leading edge 6 of the current blade to the trailing edge 5 of the current blade.

[0031] Example 1 An embodiment of the wind turbine rotor 1 according to the present invention is shown in Figure 1A , Figure 1BThe diagram is shown in the figure. In this embodiment, the wind turbine rotor 1 includes nine rotor blades 2 defining the sidewalls of the wind turbine rotor 1. The rotor blades 2 have a longitudinal shape and are equidistant from each other. The wind turbine rotor 1 is substantially in the shape of a longitudinally pleated tube, wherein the "pleats" are indentations on the sidewalls of the rotor blades of the present invention. Each blade is formed by a shorter wall 3 and a longer wall 4. The direction of movement of the rotor under wind force is indicated by arrows. The turbine blades 2 have a windward surface as the outer surface of the shorter wall 3 and a leeward surface as the outer surface of the longer wall 4. The windward surface extends from the trailing edge 5 of the previous blade 2 to the leading edge 6 of the current blade 2. The leeward surface extends from the leading edge 6 of the current blade 2 to the trailing edge 5 of the current blade 2. In this embodiment, the windward surface of blade 2 is a flat surface, and the leeward surface of blade 2 is a convex surface. However, this does not limit the invention, and in alternative embodiments, these surfaces can be flat, convex, or concave, as long as the basic function of the wind turbine rotor 1 is maintained, namely, the effective use of low-speed wind energy. The shorter wall 3 and the longer wall 4 of blade 2 define the internal space 14 of the wind turbine rotor 1, and the cross-section of rotor 1 forms a closed shape. The upper end of the wind turbine rotor 1 is closed by a cover 9. The cover provides protection for the internal space 14 against, for example, precipitation, and can tightly close the upper end of the rotor, or the fastening of the cover can provide slots for free heat dissipation.

[0032] In this embodiment, the wind turbine rotor 1 has a diameter of 11.5 cm and a sidewall thickness of 3 mm. The diameter of the wind turbine rotor 1 is the diameter of the circle surrounding the annular cross-section of the wind turbine rotor 1. The height of the wind turbine rotor 1 is 200 cm. The wind turbine rotor 1 has nine blades 2, and the leading edge 6 of each blade 2 is 7 cm away from the vertical central axis of the wind turbine rotor 1. The distance between the leading edge 6 and the vertical central axis of the wind turbine rotor 1 does not limit the invention, and in alternative embodiments, it can be longer or shorter. According to a preferred embodiment, the leading edge 6 of the blade 2 will be located within a distance of 0.55-0.82 times the diameter of the wind turbine rotor 1 from the vertical central axis of the turbine rotor 1. The number of blades 2 of the rotor 1 does not limit the invention, and in alternative embodiments, this number can be larger or smaller. According to a preferred embodiment of the invention, the number of blades 2 of the wind turbine rotor 1 is limited by a ratio of 0.4-1.1 blades 2 per 10 mm of the diameter of the wind turbine rotor 1. The height of the wind turbine rotor 1 is not limited by the invention, and in alternative embodiments, the height can be lower or higher. According to a preferred embodiment of the invention, the height of the rotor is in the range of 10 to 40 times the diameter of the wind turbine rotor 1.

[0033] According to the embodiment, the wind turbine rotor 1 rotates at a speed of 50 revolutions per minute at a wind speed of 1 m / s. Importantly, the parameters regarding the diameter, sidewall thickness, and rotational speed of the wind turbine rotor 1 are not limiting to the invention, and in alternative embodiments, they can achieve lower or higher values, as long as the efficient conversion of low-speed wind energy into electrical energy is maintained.

[0034] The method for manufacturing the wind turbine rotor 1 is carried out through the following steps. First, raw materials are supplied to an extruder and heated to obtain a plastic state of the material. Then, the plastic material is pushed through a suitable die. The resulting profile is cut to form shorter elements as the wind turbine rotor 1. Importantly, the sidewalls of the wind turbine rotor 1 thus manufactured have no joining points because it is a uniform element. In this embodiment, the raw material is poly(vinyl chloride).

[0035] Example 2 An embodiment of the wind turbine rotor 1 module according to the present invention is shown in... Figure 2 The wind turbine rotor 1 module includes a wind turbine rotor 1 according to the invention and a rotating mechanism component located in the internal space 14 of the wind turbine rotor 1. Generally, the structure of the wind turbine rotor 1 and the method for manufacturing the rotor are substantially similar to the structure and manufacturing method of the wind turbine rotor 1 presented in Example 1; therefore, for clarity of this disclosure, the steps of similar structural elements and methods will not be repeated. In this embodiment, the sidewalls of the rotor 1 are 2 mm thick, and the outer surface of the sidewalls is additionally coated with a material that converts solar energy into electrical energy, which is monocrystalline silicon. The type of material coated on the sidewalls of the rotor 1 is not limited to the invention, and in alternative embodiments, the material can be any other material that converts solar energy into electrical energy, such as polycrystalline silicon or perovskite. Additionally, the internal space 14 of the wind turbine rotor 1 is filled with a sound-insulating material in the form of polyurethane foam. However, the type of sound-insulating material is not limited to the invention, and in alternative embodiments, the material can be any other material, such as polyethylene, as long as the material retains the function of limiting noise emitted by the wind turbine rotor 1 module.

[0036] The components of the rotating mechanism are located within the internal space of the wind turbine rotor 1 and include a generator 7, a fixed turbine shaft 8, a lower inner bearing 11, and an upper inner bearing 10. The generator 7 is mounted on the fixed turbine shaft 8, which is arranged on the vertical axis of the wind turbine rotor 1. The lower inner bearing 11 is arranged on the top surface of the generator 7 to ensure the rotation of the wind turbine rotor 1 around the fixed turbine shaft 8. The upper inner bearing 10 is located at the end of the fixed turbine shaft 8 at half the height of the wind turbine rotor 1.

[0037] The generator 7 includes a rotor and a stator. The rotor of the generator 7 is a resin-cast element, while the stator is a flexible PCB. The material used to manufacture the rotor of the generator 7 is not limited to the invention, and in alternative embodiments, the material may be a mixture of adhesives, polymers, or ferrite powder (iron oxide) and binders (such as resins, adhesives, or other polymers), thereby allowing for low-energy processing of the rotor material. In this embodiment, the wind turbine rotor 1 is made of a mixture of plastic (polypropylene) and secondary plastic, wherein the amount of secondary plastic is 30% by weight of the mixture. The amount of plastic is not limited to the invention, and in alternative embodiments, the amount of plastic may be higher, provided that the structure of the wind turbine rotor 1 is durable and resistant to weather conditions.

[0038] Example 3 An embodiment of the wind power panel according to the present invention is in Figure 3 As shown in the figure. The wind turbine panel according to an embodiment includes three wind turbine rotor 1 modules of the present invention, which are arranged one after another on a lower support rail 12 at 2 cm intervals. It should be emphasized that the distance between the individual rotor 1 modules arranged on the support rail 12 does not limit the invention, and in alternative embodiments, the distance can be shorter or longer, as long as efficient conversion of low-speed wind energy to electrical energy is maintained. Generally, the structure of the wind turbine rotor 1 module is substantially similar to that of the wind turbine rotor 1 module presented in Example 2, therefore, for clarity of this disclosure, similar structural elements will not be repeated.

[0039] In this embodiment, the wind turbine rotor 1 module is attached to the lower support rail 12 via a corresponding fixed turbine shaft 8. Additionally, the electrical equipment, along with the cable tray for the connected module generator 7, is placed in the lower support rail 12.

[0040] Example 4 Figure 4 Another embodiment of the wind power panel according to the present invention is shown. Generally, the structure of the wind power panel according to this embodiment is substantially similar to the structure of the wind power panel presented in Example 3, which is why similar structural elements will not be repeated for clarity of this disclosure.

[0041] In this embodiment, the wind turbine panel includes six wind turbine rotor 1 modules, which are arranged one after another on a lower support rail 12 at a distance of 3 cm from each other. The wind turbine panel also has an upper support rail 13. The wind turbine rotor 1 modules are attached to the upper support rail 13 via an upper inner bearing 10, which in this embodiment is located at the upper end of each of the wind turbine rotor 1 modules. A fixed turbine shaft 8 extends to a height of 10 cm.

[0042] Example 5 Figure 5 A cross-section of a wind turbine rotor 1 according to the invention is shown. In this embodiment, the rotor has seven blades, and both the leeward surface, which is the outer surface of the longer wall 4 of the blade 2, and the windward surface, which is the outer surface of the shorter wall 3 of the blade 2, are convex surfaces.

[0043] Example 6 Figure 6A A wind turbine rotor 1 according to the invention is shown in an axonometric view. In this embodiment, the rotor has five blades, both the shorter wall 3 and the longer wall 4 of the blades being convex. Figure 6 clearly shows that the wind turbine rotor 1 has a longitudinally pleated tube shape, wherein the pleats are the rotor blades 2. "Pleating" is understood as having a pattern of regular folds formed by indentations in the blade shape of the rotor of the invention. According to a particularly preferred embodiment, the rotor 1 has a diameter of 14-15 cm and a length of 100-300 cm.

[0044] Figure 6B It also shows the closure. Figure 6A The cover 9 at the upper end of the rotor.

[0045] Reference tag list 1-Wind turbine rotor, 2-Rotor blades, 3-Shorter walls, 4- Longer wall, 5-Pulse edge, 6-front edge, 7-Generator, 8-Turbine shaft, 9-lid, 10-Upper inner bearing, 11-Lower inner bearing, 12-Lower support rail, 13-Upper support track, 14-Interior space.

Claims

1. A wind turbine rotor (1) for a wind turbine, the wind turbine having a vertical axis of rotation, the rotor comprising a plurality of rotor blades (2) spaced equidistant from each other, characterized in that, The rotor is essentially in the shape of a longitudinally pleated tube, the pleats of the rotor being blades (2), and each blade (2) being formed by a shorter wall (3) and a longer wall (4), wherein these shorter walls (3) and longer walls (4) of the blade (2) define the internal space (14) of the wind turbine rotor (1), and the cross-section of the rotor (1) forms a closed shape.

2. The wind turbine rotor (1) according to claim 1, characterized in that, The wind turbine rotor (1) has a cover (9) that closes its upper end.

3. The wind turbine rotor (1) according to claim 1 or 2, characterized in that, The shorter wall (3) and the longer wall (4) of the blade (2) are convex.

4. The wind turbine rotor (1) according to any one of claims 1 to 3, characterized in that, The number of blades (2) of the wind turbine rotor (1) is not even.

5. The wind turbine rotor (1) according to any one of claims 4, characterized in that, The number of blades (2) of the wind turbine rotor (1) is 3, 5 or 7.

6. The wind turbine rotor (1) according to any one of claims 1 to 5, characterized in that, The wind turbine rotor (1) is made of plastic, a mixture of plastic and secondary plastic, or aluminum.

7. The wind turbine rotor (1) according to any one of claims 1 to 6, characterized in that, The outer surface of the wind turbine rotor (1) is completely or partially coated with a semiconductor photovoltaic material, such as monocrystalline silicon, polycrystalline silicon or perovskite material.

8. The wind turbine rotor (1) according to any one of claims 1 to 7, characterized in that, At least a portion of the internal space (14) of the wind turbine rotor (1) is filled with sound-insulating material, such as polyurethane, polyethylene or a mixture thereof.

9. A wind turbine rotor (1) module, characterized in that, The wind turbine rotor (1) module includes a wind turbine rotor (1) as defined in any one of claims 1 to 8, wherein a generator (7) mounted on a fixed turbine shaft (8), a lower inner bearing (11) for ensuring the rotor rotates about the fixed turbine shaft (8), and an upper inner bearing (10) are provided in the internal space (14) of the wind turbine rotor (1), the upper inner bearing (10) being arranged on the fixed turbine shaft (8) in a region from half the height of the fixed turbine shaft (8) to the upper end of the fixed turbine shaft (8).

10. A wind-powered panel, characterized in that, The wind power panel includes at least three wind turbine rotor (1) modules as defined in claim 9, wherein the modules are mounted on a lower support rail (12).

11. The wind power panel according to claim 10, characterized in that, The wind turbine rotor (1) module is connected to the lower support rail (12) via the fixed turbine shaft (8).

12. The wind power panel according to claim 10 or 11, characterized in that, The wind power panel includes an upper support rail (13), wherein the upper inner bearing (10) is attached to the upper support rail (13).

13. A method for manufacturing a wind turbine rotor (1) as defined in any one of claims 1 to 8, characterized in that, The method includes the following steps: a) Feeding raw materials to the extruder. b) Heating the raw material to obtain the plastic state of the material. c) A plastic material is pushed through a forming head, which shapes the material into a profile as a longitudinally pleated tube, the pleats of which are blades (2), and each blade (2) is formed by a shorter wall (3) and a longer wall (4), wherein the shorter wall (3) and the longer wall (4) of the blade (2) define a hollow internal space (14) of the profile, and the cross-section of the profile forms a closed shape. d) Cut the obtained profile to the preset length.

14. The method for manufacturing a wind turbine rotor (1) according to claim 13, characterized in that, The raw material is plastic, a mixture of plastic and recycled plastic, or aluminum.

15. The method for manufacturing a wind turbine rotor (1) according to claim 14, characterized in that, The amount of secondary plastic is at least 30% by weight of the total amount of said material.

16. The method for manufacturing a wind turbine rotor (1) according to claim 14 or 15, characterized in that, The plastic is PVC, PP and / or PE.

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