Wind power generation unit

Abstract

The objective is to provide a wind power generation unit that can be used safely in urban areas, such as in urban areas, by preventing the rotor blades from detaching while maintaining a predetermined power generation efficiency, and by further reducing noise. [Solution] The wind power generation unit 1 according to the present invention generates electricity by rotating a plurality of rotating bodies 10, each having a rotor blade 12 fixed to a rotating shaft 11, within a frame 20, and generating electricity by the rotational force of the rotating bodies 10. The frame 20 consists of an upper frame 21, a lower frame 22, and side frames 23 having a predetermined front-to-back width, and has ventilation surfaces 31 that allow air to circulate while shielding the front and rear surfaces inside the frame 20. The rotating shaft 11 of the rotating body 10, which is rotatably supported by the upper frame 21 and the lower frame 22 of the frame 20, has a polygonal cross-section and has a plurality of mounting surfaces 11c on its outer circumference, and the rotor blade 12 is fixed in contact with the mounting surfaces 11c by two or more rotor blade mounting surfaces 12c, 12d on the base end side.

Description

Technical Field

[0001] The present invention relates to a small wind power generation unit installed in urban areas and the like.

Background Art

[0002] Wind power generation units are usually installed in places far from populated areas such as at sea or in mountainous regions where almost wind can be obtained. In such places, windmill-type wind power generation units with a horizontal axis of rotation facing the wind are often used. However, in recent years, there has been a growing need for more simplified utilization of wind power, and the demand for installation on rooftops or building walls in urban areas is increasing.

[0003] On the other hand, windmill-type wind power generation units are large in equipment and generate noise damage to the surroundings when the blades rotate, making them unsuitable for installation in urban areas. Therefore, there is a need for a wind power generation unit that is small enough to be used in urban areas, can generate electricity with relatively weak wind power using a rotating blade, and can be safely used in urban areas.

[0004] Patent Document 1 discloses a technique for fixing a rotor using a support plate as an example of a vertical-axis wind power generation unit. However, in order to operate safely and quietly while increasing power generation efficiency, a configuration as simple as possible is preferable, and the content described in Patent Document 1 is not suitable.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] Therefore, the present invention aims to provide a wind power generation unit that can be used safely in urban areas, such as in urban areas, by preventing the rotor blades from detaching while having a predetermined power generation efficiency, and by further preventing noise. [Means for solving the problem]

[0007] Therefore, the wind power generation unit according to the present invention is a wind power generation unit in which a plurality of rotating bodies, each with a rotating blade fixed to a rotating shaft, are rotated within a frame, and electricity is generated by the rotational force of the rotating bodies, The frame body consists of an upper frame, a lower frame, and side frames having a predetermined front-to-back width, and has a ventilation surface material portion that provides ventilation while shielding the front and rear surfaces inside the frame body. The rotating shaft of the rotating body, which is rotatably supported on the upper and lower frames of the frame, has a polygonal cross-section and multiple mounting surfaces on its outer surface, and the rotor blade is fixed in contact with the mounting surfaces by two or more rotor blade mounting surfaces on the base end side.

[0008] Furthermore, the rotating shaft of the rotating body is supported by an upper frame bearing on the upper frame at the placement position and a lower frame bearing on the lower frame. Preferably, the lower frame bearing is placed inside the bottom base portion formed on the bottom surface of the lower frame and surrounding it, and the upper frame bearing is placed inside the top base portion formed on the top surface of the upper frame and surrounding it.

[0009] Furthermore, it is preferable that the rotation axis of the rotating body reaches the generator positioned above it via the upper frame bearing within the top base portion, and that the upper frame has a cover portion that shields the area around it so as to enclose the top base portion and the generator.

[0010] Furthermore, the lid portion has a lid wall surface that rises from the periphery of the upper frame, and a lid upper surface that shields the upper edge of the lid wall surface. It is preferable to provide electromagnetic wave shielding sections on the inner surfaces of the lid wall and the upper surface of the lid. [Effects of the Invention]

[0011] According to the invention described in claim 1, a unit is formed in which a rotating body rotates to generate electricity within a frame, thus providing a predetermined power generation effect while being safe to use even in urban areas. Multiple mounting surfaces are formed on the cross-section of the rotating shaft, and two or more mounting surfaces of the rotor blades are fixed in contact with each other to strengthen the fixing, while the frame has a ventilation surface, so even if the rotor blades come off, they can be kept inside the frame, allowing for safe use even in urban areas.

[0012] According to the invention described in claim 2, the rotating shaft is connected to two bearings at the top and bottom, thereby reducing vibration noise caused by rotation. Furthermore, since these bearings are positioned inside the top and bottom base sections, which are enclosed, vibration noise is prevented from leaking out. This also prevents noise pollution, making it safe to use even in urban areas.

[0013] According to the invention described in claim 3, by further arranging a bearing in the upper top base and a cover that covers the generator placed on the bearing, the leakage of vibration noise can be further prevented, making it possible to use safely even in urban areas.

[0014] According to the invention described in claim 4, by providing an electromagnetic wave shielding portion on the inner surface of the lid, it becomes possible to shield electromagnetic waves generated by power generation from leaking to the outside. This makes it possible to use the device safely even in urban areas. [Brief explanation of the drawing]

[0015] [Figure 1] This is a partially transparent, overall front view of the wind power generation unit. [Figure 2] This is a partially transparent, overall side view of a wind turbine unit. [Figure 3] This is a perspective view showing the frame and ventilation panel of a wind turbine unit. [Figure 4] This shows the rotating body of a wind power generation unit; (a) is an overall perspective view, and (b) is a partially enlarged exploded perspective view of the upper end portion. [Figure 5](a) is an enlarged cross-sectional view taken along line A-A of FIG. 4 showing a cross-section of the rotating body, and (b) is a partially enlarged perspective view of only the rotor blade of the wind power generation unit. [Figure 6] It is a side view of only the lid part, with the internal electromagnetic wave shielding part shown by a broken line.

Mode for Carrying Out the Invention

[0016] The wind power generation unit of the present invention will be described based on the drawings. Note that the following description is based on one embodiment, and the present invention is not limited thereby.

[0017] As shown in FIGS. 1 and 2 showing the entire unit, the wind power generation unit 1 is a unit in which a plurality of rotating bodies 10 are arranged in a frame body 20, and the rotating bodies 10 rotate by receiving the wind force blown thereon, and power is generated by the rotational force. The wind power generation unit 1 can mainly be installed in parallel on the rooftops of commercial facilities, but in addition, it can also be installed outdoors of houses or used as a boundary wall of a house, etc., so that it can be used even in urban areas. Note that FIGS. 1 and 2 originally show the bearings 2 and 3 and the generator 4 that are hidden by the frame body 20 and the lid part 40 in a transparent manner.

[0018] The wind power generation unit 1 of the present embodiment arranges seven rotating bodies 10, 10 inside the frame body 20, and while rotatably supporting the upper and lower sides of each of the rotating bodies 10, 10 by the upper frame bearing 2 and the lower frame bearing 3, power is generated by the generators 4, 4 arranged on each of the rotating bodies 10, 10. The power generated by the generators 4, 4 is transmitted outside the unit by a cable (not shown).

[0019] The frame body 20 forming the unit will be described. As shown in FIG. 3, it is a rectangular frame in a front view (see FIG. 1) with the longitudinal direction in the left-right direction, which is composed of an upper frame 21, a lower frame 22, and side frames 23, 23. By arranging a plurality of such wind power generation units 1 in parallel or vertically, it can be used even in urban areas.

[0020] The frame 20 is made of metal such as stainless steel and has a predetermined front-to-back width, and is capable of accommodating the rotating body 10 inside. The upper frame 21 of the frame 20 has a top surface 21a with a predetermined front-to-back width and hanging pieces 21b, 21b hanging down from its front and rear ends, the lower frame 22 has a bottom surface 22a with a predetermined front-to-back width and rising pieces 22b, 22b rising upward from its front and rear ends, and the side frame 23 has a side surface 23a with a predetermined front-to-back width and side pieces 23b, 23b extending from its front and rear ends toward each other's side frames.

[0021] The upper frame 21, lower frame 22, and side frames 23, 23 are fixed by connecting the hanging piece 21b to the side piece 23b, and the side piece 23b to the rising piece 22b with screws or the like. Note that the fixing means and fixing positions of the frame 20 are just examples and other methods may be used. In addition, although the frame 20 in this embodiment can be installed by attaching legs (not shown) to the frame 20 to make it stand upright, other means of installation may be used.

[0022] Furthermore, ventilated and shielding surface material sections 31, 31 are placed on the front and rear sides enclosed by the frame 20. The ventilated surface material sections 31, 31 are fixed to the hanging pieces 21b, rising pieces 22b, and lateral pieces 23b, 23b located on the front and rear sides, respectively, and are ventilated surface materials. For example, they may be stainless steel mesh material, or other materials.

[0023] The frame 20 of this embodiment has a hollow top base portion 24 positioned on the upper plane of the top surface 21a of the upper frame 21. The top base portion 24 has a front, rear, and top surface that shields the surroundings, and has an appropriate shaft hole for passing the rotating shaft, which will be described later. In this embodiment, the top base portion 24 has open sides, but the sides may also be shielded. Upper frame bearings 2, 2 that rotatably support the rotating shaft, which will be described later, are arranged inside the top base portion 24.

[0024] Furthermore, it also has a hollow base portion 25 positioned on the upper plane of the bottom surface 22a of the lower frame 22. The top base portion also has a front, rear, and top surface that shields the surrounding area on all four sides, and has an appropriate opening for the shaft hole through which the rotating shaft, which will be described later, passes. In this embodiment, the base portion 25 has open sides, but the sides may also be shielded. Inside the base portion 25 are lower frame bearings 3, 3 that rotatably support the rotating shaft, which will be described later.

[0025] The rotating body 10 is rotatably supported by the upper frame bearing 2 in the top base portion 24 and the lower frame bearing 3 in the bottom base portion 25 (see Figure 1). In this embodiment, seven rotating bodies 10 are arranged within the frame 20. Note that the number of rotating bodies 10 is not limited to this embodiment and may be three, ten, or any other number.

[0026] Next, the rotating body 10 will be described. As shown in Figures 4 and 5, the rotating body 10 consists of one rotating shaft 11 and three rotating blades 12. The rotating shaft 11 consists of a round shaft portion 11a at the upper and lower ends, and a shaft body 11b between the upper and lower ends which has a polygonal shape in cross-section. In this embodiment, the shaft body 11b has a regular hexagon in cross-section, but it may also have a regular octagon, a regular decagon, or the like. By making the shaft body 11b have a regular hexagon in cross-section, six rectangular contact surfaces 11c, 11c are formed on the outer surface with the axial direction as the longitudinal direction.

[0027] The round shaft portions 11a at the upper and lower ends of the aforementioned rotating shaft 11 are the parts that are pivotally supported via the upper frame bearing 2 and the lower frame bearing 3, while the shaft body 11b, which has a polygonal cross-section, is the part that contacts and fixes the rotor blade 12, which will be described later.

[0028] The rotor blade 12 is formed by bending a single strip-shaped plate-like member along a bending line extending vertically, as shown in Figure 5(b). It consists of a rotor blade base end surface 12c, which extends from the base end to the first bent portion 12a; a rotor blade central surface 12d, which extends from the first bent portion 12a to the second bent portion 12b; and a rotor blade tip surface 12e, which extends from the second bent portion 12b to the tip.

[0029] More specifically, the lateral length is increased from the base end surface 12c of the rotor blade, the center surface 12d of the rotor blade, to the tip surface 12e of the rotor blade, while the lateral length of the base end surface 12c of the rotor blade is shorter than the lateral length of the contact surface 11c of the rotation axis 11. The base end surfaces of the base end surface 12c and the center surface 12d of the rotor blade become the rotor blade contact surfaces that contact the contact surface 11c of the rotation axis 11. The lateral length of the tip surface 12e of the rotor blade is approximately 1.2 to 1.5 times that of the center surface 12d of the rotor blade. In addition, the vertical length of the rotor blade 12 is approximately the same as the shaft body 11b of the rotation axis 11, the second bend 12b is bent at 120 degrees, and the first bend 12a has the same vertex angles as the polygonal cross-section of the shaft body 11b of the rotation axis 11.

[0030] The contact and fixing of the rotating shaft 11 and the rotor blade 12 will be explained. In particular, as shown in Figure 4(b), in this embodiment, six contact surfaces 11c, 11c are formed on the outer surface of the shaft body 11b of the rotating shaft 11. The base end surface 12c of the rotor blade 12 is brought into contact with one of the contact surfaces 11c and welded and fixed. Also, since the first bent portion 12a is the same as the vertex angle of the shaft body, the base end side of the rotor blade central surface 12d comes into contact with the other contact surfaces 11c adjacent to the first contact surface 11c. By welding and fixing both the base end side portion of the rotor blade central surface 12d and the adjacent contact surfaces 11c, the rotor blade 12 can be welded and fixed to two of the outer surfaces of the rotating shaft 11, and can be firmly fixed.

[0031] In this embodiment, the parts are fixed by welding, but in other embodiments, they may be fixed by strong adhesive or other fixing methods. Alternatively, by increasing the number of bent sections, they may be fixed to three surfaces of the polygonal axial contact surface.

[0032] In this embodiment, the rotor blades 12 are welded to two faces of the shaft body 11b, which has a regular hexagonal cross-section, making it possible to attach three rotor blades 12, 12 to the rotating shaft 11. In another embodiment, the rotor blades 12 may be fixed to two faces of the shaft body 11b, which has a regular octagonal cross-section, thereby fixing four rotor blades 12, 12.

[0033] In this embodiment, the rotor blade 12 is fixed to the rotation shaft 11 by the entire surface of the base end surface 12c of the rotor blade at the base end and the base end side surface of the central rotor blade 12d, and the central rotor blade 12d and the tip rotor blade 12e serve as wind-receiving surfaces. Therefore, by fixing it to the rotation shaft 11 on multiple surfaces while stably obtaining wind power, it is possible to generate stable and safe wind power that is less likely to come off. Furthermore, by forming a frame 20 around the rotating body 10 and arranging ventilation surface material parts 31, 31 on the front and rear surfaces of the frame 20, even if the rotor blade 12 comes off the rotation shaft, it can be kept inside the frame, making it possible to provide a wind power generation unit 1 that can be used safely even in urban areas.

[0034] Next, the noise reduction of the wind power generation unit 1 of this embodiment will be explained. The upper frame bearing 2 and lower frame bearing 3 described above are arranged inside the top base portion 24 of the upper frame and the bottom base portion 25 of the lower frame, and pivotally support the round shaft portion 11a of the rotating shaft 11 via mounting holes. Having bearings on both the top and bottom makes it easier for the rotating shaft 11 to rotate even in a light breeze, suppressing the generation of noise. Furthermore, since the upper and lower bearings are located inside the top base portion 24 and bottom base portion 25, which are shielded from the surroundings, the transmission of sound to the outside is further suppressed, making it possible to use the unit without noise even in urban areas. In addition, the top base portion 24 and bottom base portion 25 form a roughly rectangular box that covers the lower frame bearing 3, which also prevents the rotating shaft 11 from being submerged in water and damaged by rust.

[0035] The lid portion 40 will now be described. As shown in Figures 1 and 2, and especially in Figure 6, the lid portion 40 is placed above the upper frame 21 of the frame body 20 and consists of lid wall surfaces 41, 41 that rise from the periphery and a lid top surface 42. The lid wall surfaces 41, 41 rise vertically from the front, rear, and both sides of the upper frame 21, and the lid top surface 42 connects the upper ends of the lid wall surfaces 41, 41 and consists of front and rear inclined portions and a central horizontal portion.

[0036] The lid portion 40 has fixing portions 43, 43 that protrude inward from the front and rear lid portion walls 41, 41. These fixing portions 43, 43 function as a mounting surface that can be placed on the upper frame 21. The lower ends of the lid portion walls 41, 41 extend downward from the fixing portions 43, 43.

[0037] The lid portion 40 has an internal housing section, allowing it to be placed to accommodate the top base portion 24 of the upper frame 21 and the generator 4. An electromagnetic wave shielding portion 44 is positioned along the inner surfaces of the lid wall 41 and the lid top surface 42 of the lid portion 40. In this embodiment, the electromagnetic wave shielding portion 44 is made of copper plate and is welded and fixed along the lid wall 41 and the lid top surface 42. This electromagnetic wave shielding portion 44 prevents electromagnetic waves from the generator 4 from reaching the outside. [Explanation of Symbols]

[0038] 1... Wind turbine unit, 2... Upper frame bearing, 3... Lower frame bearing, 4... Generator 10...Rotating body, 11...Rotating shaft, 11a...Round shaft portion, 11b...Shaft body, 11c...Contact surface, 12...Rotor blade, 12a...First bent section, 12b...Second bent section, 12c...Rotor blade base end face (rotor blade contact surface), 12d...Rotor blade center face (rotor blade contact surface), 12e...Rotor blade tip face, 20...frame, 21...upper frame, 22...lower frame, 23...side frame, 24...Top base section, 25...Bottom base section, 31...Ventilated surface material section, 40...Lid part, 41...Lid part wall surface, 42...Lid part top surface, 43...fixing part, 44...electromagnetic wave shielding part.

Claims

1. In a wind power generation unit in which multiple rotating bodies, each with a rotor blade fixed to a rotating shaft, are rotated within a frame, and electricity is generated by the rotational force of the rotating bodies, The frame body consists of an upper frame, a lower frame, and side frames having a predetermined front-to-back width, and has a ventilation surface material portion that provides ventilation while shielding the front and rear surfaces inside the frame body. A wind power generation unit characterized in that the rotating shaft of the rotating body, which is rotatably supported on the upper and lower frames of the frame, has a polygonal cross-section and multiple mounting surfaces on its outer surface, and the rotor blades are fixed in contact with the mounting surfaces by two or more rotor blade mounting surfaces on the base end side.

2. The rotating shaft of the rotating body is supported by an upper frame bearing on the upper frame at the placement position and a lower frame bearing on the lower frame. The wind power generation unit according to claim 1, characterized in that the lower frame bearing is located inside a bottom base portion formed on the bottom surface of the lower frame and surrounding it, and the upper frame bearing is located inside a top base portion formed on the top surface of the upper frame and surrounding it.

3. The wind power generation unit according to claim 2, characterized in that the rotation axis of the rotating body reaches a generator positioned above it via an upper frame bearing within the top base portion, and the upper frame has a cover portion that shields the area around the top base portion and the generator.

4. The lid portion has a lid wall surface that rises from the perimeter of the upper frame and a lid upper surface that shields the upper edge of the lid wall surface. The wind power generation unit according to claim 3, characterized in that electromagnetic wave shielding parts are provided on the inner surfaces of the lid wall and the upper surface of the lid.

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