Lightweight vertical-axis wind turbines and lightweight wind power generation devices

Abstract

Conventional saponius-type wind turbines are large because the generator is connected to the lower part of the turbine's rotating shaft; the goal is to make them more compact. Furthermore, it prevents rainwater, snow, or fallen leaves from accumulating in various parts of the wind turbine. A small, lightweight wind turbine and wind power generation device that can generate stable torque and electromotive force even when wind direction and speed change rapidly, and can utilize wind from all directions, including horizontal, vertical, and oblique directions, to generate rotational torque. [Solution] A vertical-axis wind turbine comprising a bucket having a roughly hemispherical paddle section at the top and a semi-cylindrical bucket section at the body, arranged horizontally offset along the plane of a cylinder cut in half vertically, such that wind flowing into the concave side of one bucket flows into the concave side of the other bucket, and a wind power generation device equipped with a generator inside the bucket.

Description

Technical Field

[0001] The present invention relates to a windmill and a wind power generation device.

Background Art

[0002] Wind power generation is a device that obtains power generation energy by utilizing clean and inexhaustible natural energy, and occupies the largest power generation amount among the world's renewable energies. In Japan, which relies heavily on imported energy, it is expected to grow the most in the future from the perspectives of energy security, a deoxygenated society, and prevention of global warming. Currently, in large-scale onshore and offshore wind farms, propeller-type power generation devices with high aerodynamic conversion efficiency are the mainstream.

[0003] However, in Japan, the problem regarding the installation location is particularly significant. In Japan with a narrow land area, there are many densely populated areas, and people live on flatlands where it is easy to install and maintain large windmills. In particular, there are many cities along the coast, and the installation locations are limited. However, installing in mountainous areas increases costs, so there are many issues regarding the installation location. Especially in Japan where there are few installation locations, the practicality of lightweight windmills is high.

[0004] And, in order to meet the local power demands of general households and offices, etc., vertical-axis type small power generation devices that are not affected by the wind direction are widespread. As a typical vertical-axis type power generation device, for example, there is the Savonius type (see Fig. 1b). This is composed of two blades, and the left and right blades slightly overlap each other in the circumferential direction far apart from each other, and the wind is sent to the other side to compensate for the negative pressure, reduce the negative pressure resistance, and obtain the utilization torque due to the different air resistances. A Savonius type windmill with an embossment formed on the blade has been proposed, which can rotate efficiently even in weak winds and has a small wind cut noise on the rear side of the blade, and is a drag utilization type windmill (for example, see Patent Document 1).

[0005] Also, a wind power generation device with a simple structure for general households, for example, combining the Savonius type and the Darrieus type, has already been proposed (for example, see Patent Document 2).

Prior Art Documents

[0006] [Patent Document 1] Special publication number 2006-046337

[0007] [Patent Document 2] Japanese Patent Application Publication No. 11-294313 [Overview of the project] [Problems that the invention aims to solve]

[0008] As mentioned above, propeller-type wind turbines excel in conversion efficiency. However, they have the disadvantage of unstable output due to changes in wind speed and direction. Furthermore, Darrieus-type turbines have poorer self-starting capabilities compared to propeller-type turbines. Additionally, while Saponius-type turbines are said to be omnidirectional, the presence of upper and lower plates means they cannot adequately receive wind from above, below, or diagonally.

[0009] Furthermore, conventional saponius-type wind turbines have the generator connected to the lower part of the turbine's rotating shaft, making the entire wind power generation system large, and further miniaturization remains a challenge.

[0010] Furthermore, there are challenges in improving the ease of installation and removal of parts, making manufacturing easier, and improving maintainability.

[0011] Furthermore, another challenge is to absorb the large impact energy that occurs when a large force (excessive wind force, sudden gusts of wind, flying debris) is applied to the wind turbine, thereby preventing the wind turbine from being destroyed.

[0012] Furthermore, conventional wind power generation systems have the problem that rainwater, snow, or fallen leaves accumulate in various parts of the wind turbine, preventing efficient operation.

[0013] Furthermore, addressing the issue of low output, a drawback of lightweight wind turbines, is also a challenge.

[0014] This invention has been made in view of the above-mentioned conventional problems, and aims to provide a lightweight wind turbine and wind power generation device that can obtain stable torque and electromotive force even when the wind direction and wind speed change rapidly, and can obtain rotational torque by utilizing wind from all directions, not only horizontally but also vertically and obliquely. [Means for solving the problem]

[0015] (1) A vertical-axis wind turbine equipped with multiple buckets, wherein the buckets are arranged in a state where they are horizontally offset along the plane of a cylinder cut in half vertically, and the wind flowing into the concave surface of one bucket flows into the concave surface of another bucket, wherein the shape of the buckets is such that a substantially hemispherical paddle portion is formed at the top and a semi-cylindrical bucket body is formed on the body.

[0016] (2) The buckets are connected to each other at a part of the paddle section, providing the vertical-axis wind turbine described in (1).

[0017] (3) The bucket body has ribs formed on it, a hub is provided on the rotor shaft of the vertical-axis wind turbine, the ribs and the hub are formed to engage with each other, and the ribs are formed to be easily attached to and detached from the hub, providing the vertical-axis wind turbine described in (1).

[0018] (4) The vertical-axis wind turbine described in (1) above is provided, wherein the mount is positioned between the lower end of the rotor shaft and the base and inside the bucket.

[0019] (5) A vertical-axis wind turbine as described in (3) above, with notches formed in the ribs for fastening.

[0020] (6) To provide the vertical axis wind turbine described in (3), wherein a hub tapered portion is formed on the hub.

[0021] Provide a wind power generation device including the vertical-axis windmill according to any one of (1) to (6) above, and a generator that generates electricity by the rotation of the rotor shaft of the vertical-axis windmill provided inside the bucket.

Advantages of the Invention

[0022] According to the windmill of the present invention, a bucket (blade) having the advantages of both a paddle windmill and a Savonius windmill is adopted. Therefore, it is not necessary to use components such as a wind guide plate, and wind can be efficiently taken in. As a result, rotational torque can be obtained even with relatively weak wind.

[0023] In addition, when the bucket is attached to the hub of the rotor shaft via a rib, it is not necessary to provide two upper and lower disks for supporting the blades required for a Savonius-type windmill, and the windmill of the present invention can be manufactured in a lightweight manner.

[0024] In addition, since the shape of the bucket of the present invention forms a substantially hemispherical paddle portion at the upper part and a semi-cylindrical bucket body portion at the body portion, rainwater, snow, or dead leaves are unlikely to accumulate in each part in the wind power generation device of the present invention.

[0025] According to the wind power generation device of the present invention, the windmill is lightweight, and by installing the mount at the lower part of the generator, a stable electromotive force can be obtained even when the wind direction and wind speed change rapidly.

[0026] According to the wind power generator of the present invention, even with relatively weak wind using the windmill, a chargeable voltage can be reached and electric power can be stored in a battery. In addition, since the generator can be installed inside the bucket, it is compact and lightweight, so it is easy to transport. Therefore, it can be easily installed around a windy high place regardless of the installation location.

[0027] In addition, the power generation amount of the wind power generation device of the present invention can be set by increasing the number in the horizontal or vertical direction.

[0028] The wind power generation device of the present invention has a rounded shape of the bucket, is safe, and can be used everywhere regardless of the installation location, having excellent quietness and weather resistance. [Brief explanation of the drawing]

[0029] [Figure 1] These are explanatory diagrams showing the shape of the bucket of a wind turbine according to one embodiment of the present invention. (a) is a conventional paddle-type wind turbine. (b) is a conventional saponius-type wind turbine. (c) is a plan view of the bucket of a wind turbine according to an embodiment of the present invention. (d) is a front view of the bucket of a wind turbine according to an embodiment of the present invention.

[0030] [Figure 2] This diagram illustrates the airflow in a bucket of a wind turbine, which is one embodiment of the present invention. (a) is a diagram illustrating the airflow through a packet viewed from directly above the wind turbine. (b) is a diagram illustrating the airflow through a (AA) packet viewed from the side of the wind turbine. [Figure 3] This figure shows a wind turbine according to one embodiment of the present invention. (a) is a perspective view of the wind turbine according to one embodiment of the present invention. (b) is a plan view of the wind turbine according to one embodiment of the present invention. (c) is a plan view of the wind turbine according to one embodiment of the present invention with the ribs and hub attached. (d) is a plan view showing the shape of the hub according to another embodiment of the present invention.

[0031] [Figure 4] This is an explanatory diagram showing the arrangement of various parts of a wind power generation device, which is one embodiment of the present invention. [Figure 5] This is a partial perspective view showing the mounting state of the ribs and hub of a wind power generation device, which is one embodiment of the present invention. [Figure 6] This is a perspective view showing the swaying of a bucket in a wind power generation device, which is one embodiment of the present invention, when subjected to wind from all directions. [Figure 7] This is an explanatory diagram showing the tilt of the mount and bucket when a wind power generation device, which is one embodiment of the present invention, is subjected to sudden strong winds or excessively strong winds. [Figure 8]This is a partial perspective view showing the mounting state of each part of the mount of a wind power generation device according to one embodiment of the present invention. (a) is a front view of a wind power generation device showing the installation of the mount according to one embodiment of the present invention. (b) is a front view of the mount according to one embodiment of the present invention. (c) is a front view of the mount according to one embodiment of the present invention in an inclined state. (d) is a front view of the mount according to one embodiment of the present invention in a disassembled state. (e) is a front view of the mount according to one embodiment of the present invention in an inclined state. [Figure 9] A designated front view showing a wind power generation device, which is one embodiment of the present invention, connected in the horizontal and vertical directions. [Modes for carrying out the invention]

[0032] (Book windmill 1-Overview) The wind turbine 1 of the present invention relates to a vertical-axis wind turbine. Preferably, among vertical-axis wind turbines, it is a saponius wind turbine (Figure 1(b)). The wind turbine 1 of the present invention is omnidirectional to wind. The wind turbine 1 of the present invention is a saponius type wind turbine that can be considered as one of the small-scale wind power generation devices.

[0033] Strictly speaking, a Saponius-type wind turbine is constructed by cutting a hollow cylinder in half lengthwise, and then arranging these halves of the cylinder in an alternating pattern along the dividing surface, with parts of each halve overlapping when viewed from a direction perpendicular to the dividing surface, allowing wind to pass through the gap between the halved cylinders (blades). However, in this invention, a wind turbine having multiple blades, with the inner side of each blade attached to the rotating shaft by ribs, is also referred to as a Saponius-type wind turbine.

[0034] Saponius-type wind turbines are vertical-axis wind turbines. They have blades shaped like two vertically divided cylinders, positioned horizontally to catch the wind. The wind passing through them curves around the inside of one cylinder, and the reflected wind flows into the inside of the other cylinder. This creates a pushing force in the direction of rotation and reduces resistance from headwinds, increasing rotational efficiency. While typically composed of two semi-cylindrical blades, there are also versions with three or four blades, and multi-stage designs with these turbines stacked vertically. Unlike horizontal-axis wind turbines, which require a mechanism to face the wind directly, these turbines function regardless of wind direction. The wind turbine according to an embodiment of the present invention (hereinafter referred to as "the wind turbine") and the wind power generation device according to an embodiment equipped with the wind turbine (hereinafter referred to as "the wind power generation device") will be described below.

[0035] As shown in Figure 1(d), a wind turbine according to one embodiment of the present invention (hereinafter referred to as "wind turbine 1") is composed of two roughly semi-cylindrical blades, each shaped like a bucket 10 cut in half lengthwise. For the sake of explanation, in Figure 1(d), the bucket 10 on the right will be called the right bucket, and the bucket on the left will be called the left bucket. When there is no particular need to distinguish between them, they will simply be called bucket 10.

[0036] The arrangement of the buckets 10 of this wind turbine 1 is the same as the arrangement of the blades of the saponius wind turbine shown in Figure 1(b). That is, it consists of two semi-cylindrical blades, with the left and right blades offset from each other, leaving a small overlap in the circumferential direction. In other words, as shown in Figure 2(b), two semi-cylindrical buckets 10 (half-divided cylinders) that curve concavely toward the front side receiving the wind W are mounted facing each other with their centers offset. Therefore, by directing the wind W passing between the two buckets 10 to flow onto the back surface of the opposite bucket, it creates a force that pushes in the direction of rotation and reduces the resistance of the headwind W, thereby increasing rotational efficiency (Figure 2(a)). However, the upper and lower discs of a saponius-type wind turbine are absent in this wind turbine 1. Instead, the cup portions P01 of a paddle-type wind turbine P are formed above and below the bucket 10.

[0037] Furthermore, the arrangement of the buckets 10 of this wind turbine 1 is similar to that of a Saponius-type wind turbine, with the left and right blades offset and staggered, leaving a slight overlap in the circumferential direction. Therefore, the wind W passing between the two buckets 10 (half-divided cylinders) flows into the back surface of the opposite bucket, creating a force that pushes in the rotational direction and reduces resistance from the headwind W, thereby increasing rotational efficiency.

[0038] This wind turbine 1 can generate rotational torque even with relatively weak winds W. Furthermore, due to the shape shown in Figure 3(a), this wind turbine 1 can efficiently capture wind W and has a structure that prevents the accumulation of rainwater, snow, or fallen leaves. Furthermore, this wind turbine 1 is capable of receiving wind from all directions (Figure 6). Because this wind turbine 1 has a paddle section, it can receive not only wind We from the cross direction, but also wind W (Wsd) from the diagonal upward direction, wind Wsu from the diagonal downward direction, wind Wd from directly downward direction, and wind Wu from directly upward direction. As a result, wind W can be efficiently taken into the paddle section. Furthermore, by installing a mount 42b on the upper side of the base 62, this wind turbine 1 absorbs sudden winds We in the yaw direction Ya and impacts from flying objects, thereby reducing the load on the generator 42's reduction gear and shaft (Figure 7). The mount 42b is fixed in the state shown in Figure 8(b) during normal wind conditions, and functions as shown in Figure 8(c) during excessive winds, sudden winds, and impacts from flying objects.

[0039] In other words, the wind turbine 1 is a wind turbine having a bucket 10 formed by integrally combining the cup portion P01 of a paddle-type wind turbine P and the blade portion of a saponius-type wind turbine. To put it another way, it can be said that the wind turbine 1 has a bucket 10 formed by forming the upper half of the cup portion P01 of a paddle-type wind turbine P on top of a saponius-type wind turbine, and preferably forming the lower half of the cup portion P01 of a paddle-type wind turbine P below a saponius-type wind turbine. The following describes the various parts of this wind turbine 1.

[0040] (Paddle section) The shape of the upper paddle portion of this wind turbine 1 is the same as the upper part of the wind cup P01 of a paddle-type wind turbine P (the shaded area in Figure 1(a)), as shown in Figure 1(a). In other words, the upper paddle portion of this wind turbine has a roughly hemispherical shape. However, it is not limited to a roughly hemispherical shape. That is, it may be an egg-shaped roughly hemispherical shape, an ellipsoidal shape, or a polygonal shape. Furthermore, the thickness and size (vertical height and horizontal width, etc.) of the roughly hemispherical paddle portion can be determined as appropriate. Due to the approximately hemispherical shape of the upper paddle section, upward wind Wu and diagonally upward wind Wsu can be used as drag, as shown in Figure 6, and can be taken into the inside of the bucket. In this wind turbine, lateral wind Wh can be received by the bucket body 15.

[0041] The paddle section can be integrally molded with the bucket body, as described below. Alternatively, it can be manufactured separately from the bucket body and joined together using adhesive or connectors.

[0042] The paddle portion of this wind turbine 1 can preferably be made of lightweight, corrosion-resistant, and high-strength plastics or metal materials such as FRP, polycarbonate, PVC, and aluminum alloy.

[0043] (Paddle section connection) As shown in Figure 3(b), in this embodiment, it is preferable that the buckets 10 on the left and right sides of the bucket 10 be easily attached and detached by fastening screws or bolts or other connecting parts at a portion of the paddle portion of the buckets 10. In this embodiment, an upper connecting portion 16 is formed on a portion of the paddle portion. As an alternative method of connection, a stay shaped to conform to the surfaces of the left and right paddle portions may be passed across them and connected by screws or the like. This increases the overall rigidity of the wind turbine 1. In addition, since this wind turbine 1 does not require the two upper and lower discs used in conventional saponius-type wind turbines, it is possible to reduce the weight of the wind turbine 1.

[0044] Therefore, in this wind turbine 1, the paddle section, as an action of the paddle-type wind turbine P, generates usable torque because the air resistance differs between the convex and concave sides of the wind cup P01. For this reason, this wind turbine 1 starts rotating well even in light winds. Furthermore, the arrangement of the left and right paddle sections is the same as the arrangement of the bucket body of this wind turbine 1. That is, the two left and right paddle sections are positioned facing each other with their convex surfaces facing outwards, with the concave surfaces of the paddles partially overlapping. As a result, the wind W received by one paddle can be sent to the other paddle section and the bucket body, generating a strong torque due to drag on the two buckets.

[0045] (Bucket body)

[0046] The shape of the bucket body of this wind turbine 1 is semi-cylindrical, as shown in Figure 3. However, it may also be formed in a semi-conical shape, with the upper part being narrower and the lower part wider. Alternatively, it may be formed upside down, with the upper part being wider and the lower part narrower. Furthermore, the bucket body of this wind turbine 1 is composed of two semi-cylindrical blades on the left and right sides, and by sending the wind W that has passed through one blade to the other, a strong torque due to drag is generated on the two blades.

[0047] Furthermore, while this invention primarily describes an embodiment of the wind turbine 1 with two buckets 10, the scope of the present invention also includes wind turbines with three or four or more buckets 10, as well as multi-stage wind turbines with multiple buckets stacked on top of each other, and parallel wind turbines with multiple buckets stacked side by side.

[0048] (Entire bucket 10) The bucket 10 of this wind turbine 1 will be explained using a diagram. Figure 1 is an explanatory diagram to facilitate understanding of the shape of the bucket 10 in an embodiment of the present invention. In this embodiment, the wind turbine 1 is equipped with two buckets 10 on the left and right sides, and each bucket 10 has an upper paddle portion 12, a bucket body portion (14, 15), and a lower paddle portion 13 (Figure 1(d)). The buckets 10 are arranged in a state where they are simply shifted horizontally along the plane of a cylinder cut in half vertically, and the buckets are arranged so that the wind flowing into the concave surface of one bucket flows into the concave surface of the other bucket.

[0049] In this embodiment, an upper paddle section is formed on the upper part of the bucket 10. The lower part of the wind cup P01 of the paddle-type wind turbine P is also formed on the lower part of the bucket 10 (lower paddle section 13). Hereinafter in this specification, if it is not necessary to specify whether it is the upper paddle section 12 or the lower paddle section 13, it will simply be referred to as the paddle section.

[0050] Below the upper paddle section 12, a bucket body consisting of two semi-cylindrical blade sections is formed (Figure 1(d)). The role of the bucket 10 is to receive the wind and rotate due to the drag force.

[0051] In this embodiment, the left and right buckets are positioned so that they overlap slightly, with their surfaces slightly offset along the plane of a cylinder cut in half lengthwise. The left and right buckets 10 (blades) face each other with their front surfaces facing outward, partially overlapping. Therefore, the wind W that flows into the back of one bucket 10 passes between the two buckets 10 (the halved cylinders) and flows into the back of the opposite bucket. Consequently, the wind W passing between the two buckets 10 flows into the back of the opposite bucket 10, creating a pushing force in the rotational direction and a force that reduces the resistance of the headwind W, thereby increasing rotational efficiency and obtaining strong torque.

[0052] In this embodiment, the case where there are two buckets 10 has been described, but it is also possible to provide multiple buckets 10, such as three or five.

[0053] The bucket 10 can preferably be made of lightweight, corrosion-resistant, and high-strength plastics or metal materials such as FRP, polycarbonate, PVC, and aluminum. Because these materials are lightweight, the bucket 10 can be made lightweight.

[0054] As shown in Figure 2, this wind turbine 1 can efficiently capture wind W into packets from the paddle section as well. Figure 2(a) shows the paddle section of this wind turbine 1 viewed from directly above, and Figure 2(b) shows the flow of wind W in the paddle section and blade section in the AA direction. In Figure 2(a), the flow of wind W passing through the paddle section results in a vertical downward flow from the overlap section 17 of bucket 10 to the other paddle section.

[0055] In this case, the opening area of ​​the overlap section 17 becomes smaller than the opening area of ​​the paddle section. Therefore, in this wind turbine 1, the wind speed W in the overlap section 17 of the paddle section becomes faster, and the speed at which the wind W passing between the two paddles flows into the back surface of the opposite paddle increases. This increases the force pushing in the rotational direction, thereby improving rotational efficiency.

[0056] Furthermore, the bucket 10 of this wind turbine 1 has an upper paddle section 12 that is roughly hemispherical, and the lower paddle section is also semi-circular, making it difficult for rainwater, snow, or fallen leaves to accumulate inside or outside the wind turbine 1. In this wind turbine 1, the explanation described the case where there are two buckets 10, but the number of buckets 10 may be increased as appropriate.

[0057] (Rib shape - overall) In this embodiment of the present invention, a substantially arc-shaped rib is formed on the bucket 10 as a member that transmits the rotation of the bucket 10 to the rotor shaft, and this rib is attached to a hub 22 fixed to the rotor shaft. The hub 22 is the part that connects two opposing buckets 10 to the rotor shaft 34 using ribs.

[0058] In this embodiment, as shown in Figures 3(a) and 3(c), ribs are formed on the inner wall of the bucket 10 of the wind turbine 1. In this embodiment of the wind turbine 1, the shape of the ribs is a substantially arc-shaped plate, as shown in Figure 3(c) when viewed from directly above the wind turbine. It is preferable to form recesses on the upper surface (or both sides) of the ribs for the purpose of weight reduction. However, the shape of the ribs is not limited to a substantially arc-shaped plate; any shape is acceptable as long as it can support the bucket 10 and be attached to the hub 22. In this embodiment, as shown in Figure 5, the rib is locked to the upper surface of the hub 22 on its back surface (bottom surface) and connected to the rib by a screw.

[0059] (Rib position) In this embodiment, it is preferable that the ribs be formed at a height close to the center of gravity of the bucket 10 when viewed from the front of the wind turbine. When the height at which the ribs are formed is close to the center of gravity, the lateral movement of the bucket 10 is small even when the rotational speed of the bucket 10 is high.

[0060] (Attaching ribs to the hub) In this embodiment, as shown in Figure 5, a substantially parallelogram-shaped recess, which is the shape of the hub 22, is formed on the back surface of the left rib 19 when viewed from directly above the wind turbine 1. It is preferable that the rib 19 is formed to fit with the hub 22 on the back surface and engage with the hub.

[0061] (Back of the rib) In this case, it is preferable to form a rib tapered portion 19c in the left rib recess 19a on the back surface of the left rib 19. If the area around the left rib recess 19a on the back surface of the rib is formed in a tapered shape, it becomes easier to position the rib when attaching it to the hub 22, and the left rib recess 19a and the left half of the hub 22 fit together easily. This improves the workability of the installation.

[0062] Similarly, if the right rib 18 is formed with a tapered shape in the recess, just like the left rib 19, it becomes easier to position the right rib 18 when attaching it to the right half of the hub 22, improving the workability of the installation. In this way, both the left rib 19 and the right rib 18 can be securely attached to the hub 22 at the same time, preventing rattling of the bucket 10.

[0063] (Attachment of bucket 10 to the rotor shaft) In this embodiment of the wind turbine 1, the two buckets 10 are attached to a hub 22 fixed to the rotor shaft of the wind turbine 1 via ribs. The ribs are attached to the hub 22 fixed to the rotor shaft by fastening components such as screws. The ribs have screw holes formed for attachment to the hub 22 (Figure 3(c)). The hub 22 also has attachment points, such as screw holes, at three locations: the center and two on each side, for connecting two opposing ribs (Figure 3(c)). The central screw hole is a notch for fastening the two opposing ribs together.

[0064] (Rotor shaft) In the wind turbine 1 shown in Figure 1, the roughly arc-shaped ribs formed on the bucket 10 are fixed via a hub 22 formed on the upper end of the rotor shaft. Alternatively, arc-shaped ribs such as those shown in Figure 3(c) can be formed on the bucket 10, and the bucket 10 can be supported via the ribs and the hub 22. However, bearings (for example, an upper bearing and a lower bearing) may be placed at two locations on the rotor shaft, and the buckets 10 may be supported by each bearing.

[0065] (Hub 22 shape - overall) The hub 22 is fixed to the rotor shaft as shown in Figures 3(a) and 3(b). In this embodiment, the planar shape of the hub 22 is a roughly parallelogram-shaped plate when viewed from directly above the wind turbine 1. However, the shape of the hub can be any shape as long as ribs can be attached to it. For example, a hook shape 22a may be formed as shown in Figure 3(d).

[0066] (Shape of hub 22 - mating surface with rib) In this embodiment, as shown in Figure 5, the planar shape of the hub 22 is such that both ends are circular and the width of the hub 22 increases from both ends towards the center. In other words, the planar shape of the hub is not simply a circle or a rectangle, but a roughly parallelogram shape in which the width increases linearly from the base of both ends of the circle towards the center.

[0067] (Hub taper forming section 28) The portion of the hub where the width increases in a straight line from the base of both ends towards the center is called the hub tapered portion. The shape of the base of both ends of the hub may also be a hook shape 22a, as shown in Figure 3(d). As mentioned above, a recess 19a is formed on the back surface of the left rib 19, which has the same shape as half of the parallelogram of the left hub 22. Therefore, when attaching the left rib 19 to the left half of the hub 22 from directly above, the left rib fits precisely into the left half of the hub 22, making positioning easy. Furthermore, if the shape of the bases at both ends of the circular hub is made into a hook shape 22a as shown in Figure 3(d), then when attaching the left rib 19 to the left half of the hub 22 from directly above, the left rib 19 will fit precisely into the left half of the hub 22, making positioning even easier. When the hook shape 22a is formed, the left rib 19 and the hub 22 can be temporarily locked together, making it extremely easy to attach and detach the left rib 19 to the hub 22. The same applies when attaching the right rib to the right half of the hub 22.

[0068] The hub 22 has screw holes in three locations: the center and two on each side (Figure 3(c). The central screw hole is for fastening together two opposing ribs (left rib 19 and right rib 18). The two screw holes on each side (18, 19) are for connecting two opposing ribs (left rib 19 and right rib 18), respectively.

[0069] As described above, in the embodiment of the present invention, the hub 22 and the rib can be fitted together, and the taper 19c on the outer circumference of the recess provided on the back surface of the rib, and the substantially parallelogram tapered shape 22b of the hub make it easy to position the rib when attaching it to the hub 22, and the bucket 10 can be firmly attached to the generator 42 without any play.

[0070] In this embodiment of the present invention, the bucket 10 can be attached to the wind turbine rotating shaft by attaching the ribs to the hub 22. Since the bucket 10 and ribs are very lightweight, the upper and lower discs used in conventional saponius-type wind turbines are unnecessary, allowing for a lightweight wind turbine 1 to be formed.

[0071] (Wind power generation device 2) The wind turbine 1 described above can generate wind power by attaching a generator 42. The following describes a wind power generation system that utilizes this wind turbine 1.

[0072] (Mounting position of generator 42) As shown in Figure 4, in the wind turbine 1 (hereinafter referred to as "this wind turbine"), the generator 42 can be installed in this wind turbine by attaching the ribs of the bucket 10 to the hub 22 provided on the rotor shaft of the generator 42. The generator 42 is preferably a lightweight power generation motor that rotates with little force and can produce high output. As shown in Figure 8(a), in this wind turbine, the generator can be installed inside the bucket. Preferably, the generator can be positioned inside the bucket on the upper side of the mount. In other words, the generator 42 is arranged such that the left and right buckets 10 surround the generator 42.

[0073] As a result, compared to a conventional type of wind power generation system in which the wind turbine 1 is installed on top of the generator 42, the bending stress applied to the mounting shaft of the generator 42 extending from the base 62 can be reduced. Furthermore, by installing the generator 42 inside the wind turbine 1, particularly inside the bucket, the overall size and weight of the wind power generation system were reduced. Furthermore, because the wind turbine 1 is lightweight, the rotating shaft of the generator 42 in this wind power generation device can be made smaller in diameter. As a result, the wind power generation device can improve power generation efficiency by reducing bearing friction and increasing rotational torque.

[0074] (Mount 42b) In this specification, mount 42b is a type of vibration-damping rubber. As shown in Figure 6, the wind turbine 1 is subjected to wind W forces from all directions. Therefore, when the wind turbine 1 is subjected to wind W, it sways back and forth, left and right, and up and down. To mitigate this, it is preferable that the mount be installed on the upper part of the base 62 in the wind turbine 1. In the wind turbine 1, it is even more preferable that the mount 42b be installed on the upper part of the base 62 and inside the bucket 10 (Figures 7 and 8(a)). By installing the mount 42b inside the bucket 10, the wind turbine can be made more compact.

[0075] When the generator 42 is to be placed, it is preferable to place the mount 42b between the base 62 and the generator 42, and inside the bucket 10. In this embodiment, the mount 42b and the generator 42 can be positioned inside the bucket 10, making the wind turbine 1 and the wind power generator of this embodiment more compact. Mount 42b is inherently elastic and has the property of returning to its original shape when an external force is removed, thus functioning as a spring. Therefore, it can absorb the swaying and vibrations of the wind turbine 1 through the soft movement and easily movable shape of Mount 42b itself, thereby absorbing vibration energy and exhibiting a vibration damping effect.

[0076] Next, the mount 42b of this embodiment can mitigate collisions and impacts to the wind turbine 1 caused by gusts of wind or flying objects. A rubber mount is preferred for the mount 42b. When the mount 42b is subjected to an impact, it can quickly mitigate the speed of the impacting object. Furthermore, because the mount 42b is positioned between the wind turbine 1 and the base 62, when a large force (excess wind force, sudden gust) is applied to the wind turbine 1, it initially receives the force softly, but when an excess wind force (sudden gust) We exceeds a certain level, the vibration-damping rubber of the mount 42b becomes less likely to flex rapidly, making it possible to absorb even large impact energy.

[0077] In the embodiment of the present invention, the mount 42b preferably has a limit cup 42a (Figure 8(d)) bonded to vibration-damping rubber. In a more preferred embodiment of the present invention, the mount 42b consists of a limit cap 42a, a rubber mount 42b, and a limit washer 42c, as shown in Figure 8(d). The limit cap 42a is bonded on top of the rubber mount 42b, and the limit washer 42c is bonded to the underside of the rubber mount 42b. As shown in Figure 8(c), when the wind turbine 1 is subjected to an impact due to excessive wind force or sudden gusts of wind, the limit cup 42a can limit the tilt of the rubber mount 42b of the wind turbine 1 to a certain angle.

[0078] As a result, the wind power generation device of the embodiment of the present invention can receive wind force from all directions—up, down, left, right, and front and back—and can also absorb sudden gusts of wind and impacts from flying objects from all directions, thereby reducing the load on the reduction gear and shaft of the generator 42 (Figure 6).

[0079] Furthermore, in the wind power generation device of the embodiment of the present invention, the robustness is improved and it becomes less prone to breakage by installing the mount 42b between the generator 42 and the base 62. In addition, a lightweight wind power generation device can be obtained because the bucket 10 is lightweight. In addition, a snow removal effect can be obtained because the shape of the paddle part at the top of the bucket 10 is hemispherical.

[0080] Furthermore, in the wind power generation device of the embodiment of the present invention, when the balance of the wind turbine becomes uneven due to the inflow of snow, rainwater, etc., the eccentricity of the mount 42b makes it possible to shake out the snow and rainwater from the wind turbine 1.

[0081] (Connection of this wind turbine 2)

[0082] Furthermore, the amount of power generated can be increased by connecting the wind turbines of this embodiment in the horizontal and vertical directions. For example, Figure 10 shows one such example. Multiple horizontal support columns 72 are installed on the vertical main column 71, and numerous wind turbines are installed. It is effective to connect the wind turbines of this embodiment in a tree shape, for example, by arranging 2 or 3 units horizontally and 5 or 6 units vertically. In the tree-shaped wind turbine of this embodiment, since the wind turbines are lightweight, it is possible to connect numerous wind turbines vertically and horizontally. The amount of power generated can be increased or decreased by increasing or decreasing the number of wind turbines.

[0083] It should be noted that the present invention is not limited to the embodiments described above, and various modifications can be made without departing from the spirit of the invention. For example, the bucket 10 of this wind turbine 1 is composed of two substantially semi-cylindrical blades, but those with 3 to 5 blades, and multi-stage wind turbines in which these wind turbines 1 are stacked vertically, are also included in the present invention. [Explanation of Symbols]

[0084] 1 windmill 2 Wind power generation equipment 10 buckets 12 Upper paddle section 13 Lower paddle section 14 Right bucket body 15 Left bucket body 16 Connecting part 17 Overlap section 18 Right Rib 18a Right rib recess 18b Left-hand screw hole 18c shared fastening hole 19 Left Rib 19a Left rib recess 19b Left-hand screw hole 19c Rib tapered section 22 Hubs 22a Hook shape 22b Taper formed on the hub 34 Rotor shaft 42 Generators 62 Bass 64 Generator mounting shaft 42 Mount 42a Limit Cup 42b Rubber Mount 42c limit washer 62 Bass 71 Vertical main pillars 72 Horizontal support columns 73. Base P-type paddle wind turbine P01 Wind Cup S Saponius-type wind turbine W Wind Wd Downward wind Wh (Wide wind) Wu Upward wind We excessive wind force (sudden winds) WSU wind from an upward diagonal direction Wu downward wind Yaw direction Yb Roll Direction Yc pitch direction

Claims

1. A wind turbine equipped with multiple buckets, The buckets are arranged in a manner that they are horizontally offset along the plane of a cylinder cut in half vertically, and the buckets are arranged such that the wind flowing into the concave surface of one bucket flows into the concave surface of the other bucket in this vertical-axis wind turbine. The shape of the aforementioned bucket is, The upper part has a roughly hemispherical paddle section, and the body has a semi-cylindrical bucket section. Vertical axis windmill.

2. The buckets are connected to each other at a part of the paddle section, making them easily attachable and detachable. The vertical-axis wind turbine according to claim 1.

3. Ribs are formed on the bucket body. A hub is provided on the rotor shaft of the aforementioned vertical-axis wind turbine. The rib and the hub are formed to engage with each other. The ribs are formed to be easily attached to and removed from the hub. The vertical-axis wind turbine according to claim 1.

4. The mount is positioned between the lower end of the rotor shaft and the base, and inside the bucket. The vertical-axis wind turbine according to claim 1.

5. A notch for fastening is formed in the rib. The vertical-axis wind turbine according to claim 3.

6. The hub has a hub tapered portion formed therein. The vertical-axis wind turbine according to claim 3.

7. A vertical-axis wind turbine according to any one of claims 1 to 6, A wind power generation device comprising a generator that generates electricity by the rotation of the rotor shaft of the vertical-axis wind turbine, located inside the bucket.

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