JP2004245166A - Windmill for wind power generation and wind power generation device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wind power generation device capable of effectively using both of horizontal air stream and vertical air stream and efficiently generating power. <P>SOLUTION: This windmill for wind power generation comprises a central shaft 11; a first vane 12 provided around the central shaft so that a wind receiving surface may be inclined to an axial direction of the central shaft 11 and rotating with the central shaft 11; and a second vane 13 provided outside the first vane 12 so that the wind receiving surface may become parallel to the axial direction of the central shaft 11 and rotating with the first vane 12. The second vane 13 is positioned on a base end side, and constituted so as to be inclined with a shaft 16 parallel to the central shaft 11 centered. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to wind power generation technology, particularly to a wind turbine for wind power generation.
[0002]
[Problems to be solved by the invention]
2. Description of the Related Art In recent years, wind power generators have attracted much attention as power generation means using natural energy. Specifically, a wind power generator having a structure in which a windmill and a generator are installed at the upper end of a pillar having a height of several tens of meters is well known. Needless to say, in a wind power generator having such a structure, the wind (horizontal airflow) blowing parallel to the ground surface is received by a windmill, converted into rotational force, and the generator is operated.
[0003]
By the way, such wind power generators are usually installed on a well-ventilated plain or the like, but recently installation on the ocean has been considered. For example, there is a plan to install a wind power generator on the pier of a suspension bridge to supply the power required for night lighting and the like. By the way, as is well known, not only horizontal air currents but also vertical air currents (ascending air currents) frequently occur on the ocean, and if these can be used for power generation, the efficiency will be greatly improved.
[0004]
However, in a conventional wind power generator, only a horizontal airflow can be effectively used. Needless to say, if the wind turbine is attached in a different way, power can be generated using vertical airflow, but horizontal airflow cannot be used this time. Therefore, an object to be solved by the present invention is to provide a wind power generation technology capable of efficiently utilizing both horizontal airflow and vertical airflow to efficiently generate power.
[0005]
[Means for Solving the Problems]
In the course of conducting research to solve the above problems, the present inventor has provided a wind turbine for wind power generation with a first blade corresponding to a vertical airflow and a second blade corresponding to a horizontal airflow, both of which are integrated. I came up with a structure that would rotate around a central axis. That is, a first blade provided around the central axis such that the wind receiving surface is inclined with respect to the axial direction of the central axis, and a state in which the wind receiving surface is parallel to the axial direction of the central axis. It has been considered that the power generation can be efficiently performed by effectively using both the horizontal airflow and the vertical airflow if the second airbag is constituted by the second airplane provided outside the first airplane.
[0006]
However, during further research, it has been found that merely providing the second blade outside the first blade is not sufficient. This is for the following reasons. Since the above-described wind turbine having a structure having two kinds of blades operates by receiving a force from both the vertical air flow and the horizontal air flow, the rotation speed is higher than that of the conventional wind turbine that uses only one of the air flows. Occasionally, this rotational speed may be too high to reach with conventional wind turbines, and such unavoidable phenomena will damage the outer second blade.
[0007]
In view of such circumstances, as a result of further research, the present inventor has found that the second blade is movable, that is, tilted about an axis parallel to the central axis and located at the base end side. I found out what to do. In the wind turbine for wind power generation having such a structure, a part of the force (wind pressure) acting on the second blade is properly released, so that the rotation speed does not become higher than necessary, and therefore, the second blade may be damaged. Nor. As a result, stable and permanent efficient wind power generation that effectively utilizes both the horizontal airflow and the vertical airflow can be achieved.
[0008]
The present invention has been made based on such findings, and the above-described problems
A central axis,
A first blade provided around the center axis and rotating with the center axis, such that the wind receiving surface is inclined with respect to the axial direction of the center axis;
A second blade that is provided outside the first blade and rotates together with the first blade so that a wind receiving surface is parallel to the axial direction of the central axis;
The second blade is located at a base end side thereof and is configured to be tiltable about an axis parallel to the central axis, and is solved by a wind turbine for wind power generation.
[0009]
Further, the above problem is a wind power generator configured using the wind turbine for wind power generation,
The wind turbine for wind power generation,
A vent body is formed on the opposing upper and lower surfaces and the peripheral surface, and a frame that rotatably houses and holds the wind turbine for wind power generation,
And a generator connected to a central axis of the wind turbine for wind power generation.
[0010]
The wind turbine for wind power generation further includes a ring surrounding the first blade, the first blade and the second blade are connected via the ring, and the second blade is connected to the first blade. The structure can be configured to be tiltable with respect to the ring. In this case, the tilt range (movable range) of the second blade is preferably 90 to 120 degrees. However, the second blade tilts only when an excessive force equal to or more than the specified value is applied. In other cases, the normal state (erect state) is maintained by the restoring force that is constantly applied. Will be.
[0011]
In addition, as the second blade constituting the wind turbine for wind power generation according to the present invention, a second blade having a cross section having a thickness increasing toward the center thereof and having this cross section being asymmetric in the thickness direction is used. Is preferred. When the blade having such a cross-sectional shape is used, the horizontal airflow can be particularly efficiently converted into a unidirectional rotational force, and the power generation capacity is further improved.
[0012]
In addition, in the wind turbine generator according to the present invention, a cylindrical airflow guide is provided above the frame, and the airflow guide is connected to the open end from the base end side joined to the frame. It is preferable that the tapered nozzle shape is such that the cross section decreases toward. By providing such an airflow guide, the flow velocity of the vertical airflow passing through the frame body, particularly the flow velocity of the ascending airflow, can be increased, and the power generation capacity by the vertical airflow is further improved.
[0013]
In the present specification, “the wind receiving surface is inclined with respect to the axial direction of the central axis...” Means that innumerable straight lines inclined with respect to the axial direction of the central axis, innumerable curves, or both. It means that the wind receiving surface is constituted by a plane or a curved surface obtained in a row. Also, in the present specification, “the wind receiving surface is parallel to the axial direction of the central axis...” Means that the wind direction is defined by a plane or a curved surface obtained by connecting innumerable straight lines in parallel with the axial direction of the central axis. It means that the receiving surface is configured. Therefore, the first wind receiving surface and the second wind receiving surface may be flat or curved.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be specifically described with reference to FIGS. FIG. 1 is a schematic diagram showing a wind power generator according to the present embodiment (hereinafter referred to as the present apparatus) in an installed state, and FIGS. 2 to 4 are perspective views, bottom views, and cross-sectional views of main parts of the present apparatus, respectively. 5 and 6 are a perspective view and a plan view, respectively, of the wind turbine for wind power generation according to the present embodiment.
[0015]
As can be seen from FIG. 1, the present device is installed on the top surface of a pier of a suspension bridge, for example, and generally includes a main part A and a generator B. The main part A further includes, as main components, a wind turbine for wind power generation (hereinafter referred to as the present wind turbine) 1 according to the present embodiment and a frame 2 that rotatably houses and holds the wind turbine. The central axis 11 of the wind turbine 1 is directly connected to the generator B. The frame 2 and the generator B (more precisely, the case) are connected by a cylindrical column 3, and the central axis 11 passes through the inside of the column 3. That is, the main part A, and thus the wind turbine 1, is installed on the pier via the generator B and the support 3.
[0016]
The posture of the main part A is adjusted so that the axial direction of the central shaft 11 and the vertical direction are completely coincident with each other, so that no force other than the vertical load acts on the pier. In addition, the installation target of this device is not limited to the pier, but also includes various towers and high-rise buildings.
[0017]
The frame 2 that rotatably houses and holds the windmill 1 has a structure in which a cross-shaped bottom plate and a top plate are integrally connected by a total of four columns. That is, as can be seen from FIGS. 2 and 3, the frame 2 has a cage shape, that is, a fan-shaped ventilation opening 21 on the upper surface (top plate) and the lower surface (bottom plate) opposed to each other. Is formed with a ventilation port 22. FIG. 3 shows the lower surface of the frame 2, but it goes without saying that the upper surface also has the same shape.
[0018]
As shown in FIG. 4, the windmill 1 described later in detail (in FIG. 2 to FIG. 4, a dashed line indicates a contour of a surface of a rotating body formed by rotating the windmill) has a center axis 11 having an upper surface and a lower surface. Are housed inside the frame body 2 in a state of penetrating through. More specifically, bearings 23a and 23b are arranged at the centers of the upper and lower surfaces of the frame 2. The wind turbine 1 is attached to the frame 2 via the bearings 23a and 23b, that is, rotatably held with respect to the frame 2. Accordingly, the windmill 1 rotates at a high speed in a stable state by the action of a vertical airflow (ascending airflow) or a horizontal airflow introduced into the frame 2 through the ventilation holes 21 and 22 as indicated by arrows in FIG.
[0019]
Above the frame 2, a tubular airflow guide 4 is provided. The air flow guide 4 has a tapered nozzle shape whose cross section decreases from the base end (lower end) side joined to the frame 2 toward the open end (upper end) side. Moreover, the peripheral surface is depressed in the direction of the center line. The airflow guide 4 is provided to increase the flow velocity of the ascending airflow passing through the inside of the frame body 2 to further improve the power generation capability, but may be removed in some cases. For example, when the present apparatus is installed in a zone where not only an updraft airflow but also a downdraft airflow frequently occurs, and the airflow guide 4 is not required, the airflow guide 4 becomes unnecessary, and is removed from the frame 2.
[0020]
Next, the structure and function of the wind turbine 1 will be described. As can be seen from FIG. 5, the wind turbine 1 includes the above-described central shaft 11, the first blade 12, and the second blade 13 as main components. The first blade 12 that rotates with the central shaft 11 is provided around the central shaft 11 such that the wind receiving surface is inclined with respect to the axial direction of the central shaft 11. That is, the base end side of the first blade 12 is firmly joined to the central axis 11. In the present embodiment, a windmill provided with two first blades 12 has been described as an example, but the number is not particularly limited.
[0021]
Here, as the first blade 12, a three-dimensionally curved shape in which the upper edge and the lower edge are twisted by 90 degrees is used, but the wind receiving surface is in the axial direction of the central axis 11. The first blade 12 may have any shape as long as it is inclined. In short, it is only necessary to have a wind receiving surface that can convert the airflow in the direction along the axial direction of the central axis 11 into a rotational force around the central axis 11.
[0022]
The second blade 13 is provided outside the first blade such that the wind receiving surface is parallel to the axial direction of the central axis 11. In the present embodiment, a windmill provided with two second blades 13 has been described as an example, but the number is not particularly limited. Further, here, the second blade 13 has a cross section having a thickness increasing toward the center thereof, and the second blade 13 is asymmetric in the thickness direction.
[0023]
That is, the second blade 13 has a substantially D-shaped cross section. However, if the wind receiving surface is in a state parallel to the axial direction of the central axis 11, the second blade 13 may have any shape. You may. In short, it is only necessary to have a wind receiving surface that can convert the air flow in a direction orthogonal to the axial direction of the central axis 11 into a rotational force around the central axis 11. It does not matter whether the surface is flat or curved. However, the second blades 13 are arranged in the same direction in the circumferential direction of the central axis 11.
[0024]
The wind turbine 1 further includes rings 14a and 14b surrounding the first blades 12 together with the above components. The upper edge of the first blade 12 is firmly joined to the inner peripheral surface of the ring 14a, and the lower edge of the first blade 12 is firmly joined to the inner peripheral surface of the ring 14b. On the other hand, the second blade 13 is attached to the outer peripheral surfaces of the rings 14a and 14b, more precisely, to a convex portion 15 provided on the outer peripheral surfaces. Therefore, the first blade 12 and the second blade 13 are connected via the rings 14a and 14b, so that they share a center of rotation. That is, the first blade 12 and the second blade 13 rotate integrally (rotate clockwise as viewed from above).
[0025]
The second blade 13 is movable as shown in FIG. That is, the second blade 13 is located on the base end side, and is configured to be tiltable with respect to the rings 14a and 14b around an axis (tilt axis) 16 parallel to the central axis 11. Needless to say, the shaft 16 also serves to connect the convex portion 15 and the second blade 13. The tilting range of the second blade 13 (indicated by θ in FIG. 6) is set to 90 to 120 degrees by restricting with a stopper (not shown). The second blade 13 tilts only when an excessive force exceeding a certain specified value acts on the second blade. Otherwise, the normal state (the upright state) shown in FIG. 6 is maintained by the action of the restoring force applying means (not shown) arranged on the mounting portion of the second blade 13.
[0026]
In the present apparatus provided with the wind turbine 1 having the above structure, the first blade 12 rotates mainly by receiving a vertical airflow (ascending airflow), while the second blade 13 rotates by receiving a horizontal airflow to generate electric power. Let it. By the way, since a windmill equipped with such two types of blades operates by receiving both a vertical airflow and a horizontal airflow, the rotation speed is higher than that of a conventional windmill that uses one of the airflows. However, in the wind turbine 1, since the second blade 13 can be tilted as described above, a part of the force (wind pressure) acting on the second blade 13 can be properly released, and the rotation speed is required. It will not be higher. Therefore, the second blade 13 is not damaged, and stable and permanent efficient wind power generation that effectively utilizes both the horizontal airflow and the vertical airflow can be achieved.
[0027]
【The invention's effect】
According to the wind power generation technology of the present invention, it is possible to efficiently generate power by effectively utilizing both the horizontal airflow and the vertical airflow.
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing a wind power generator according to an embodiment of the present invention in an installed state; FIG. 2 is a perspective view of a main part of the wind power generator according to an embodiment of the present invention; FIG. FIG. 4 is a bottom view of a main part of the wind turbine generator according to the embodiment. FIG. 4 is a cross-sectional view of the main part of the wind turbine generator according to the embodiment of the present invention. FIG. 5 is a perspective view of a wind turbine for wind turbine generator according to the embodiment of the present invention. FIG. 6 is a plan view of a wind turbine for wind power generation according to an embodiment of the present invention.
A main part of wind power generator B generator of wind power generator 1 wind turbine for wind power generation 2 frame 3 support 4 airflow guide 11 center axis 12 first blade 13 second blade 14a, 14b ring 15 convex part 16 axis ( Tilt axis)
21, 22 Vent holes 23a, 23b Bearing

Claims (6)

A central axis,
A first blade provided around the center axis and rotating with the center axis, such that the wind receiving surface is inclined with respect to the axial direction of the center axis;
A second blade that is provided outside the first blade and rotates together with the first blade so that a wind receiving surface is parallel to the axial direction of the central axis;
The wind turbine for wind power generation, wherein the second blade is located at a base end side thereof and is configured to be tiltable around an axis parallel to the central axis. A ring surrounding the first blade, wherein the first blade and the second blade are connected via the ring, and the second blade is tiltable with respect to the ring; The wind turbine for wind power generation according to claim 1, wherein the wind turbine is configured. The wind turbine for wind power generation according to claim 1 or 2, wherein the tilt range of the second blade is 90 to 120 degrees. The second blade has a cross section whose thickness increases toward the center thereof, and the cross section is asymmetric in the thickness direction. Windmill for wind power. A wind turbine generator using the wind turbine for wind power generation according to any one of claims 1 to 4,
The wind turbine for wind power generation,
A vent body is formed on the opposing upper and lower surfaces and the peripheral surface, and a frame that rotatably houses and holds the wind turbine for wind power generation,
And a generator connected to a center axis of the wind turbine for wind power generation. A cylindrical airflow guide is provided above the frame body, and the airflow guide has a tapered nozzle shape whose cross section decreases from the base end side joined to the frame body toward the open end side. The wind power generator according to claim 5, characterized in that:

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