JP3744893B2 - Basket type windmill - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a windmill, and more particularly to a cage type windmill.
[0002]
[Prior art]
Wind turbines that convert natural wind power into rotational power have long been used as various power sources in human history. However, in order to maintain an advanced living environment with the rapid progress of science and technology in recent years, the mass consumption of fossil fuel resources has been accelerated, and as a result, the depletion of fossil fuel resources, which are limited in the future, is expected. There are concerns. In addition, global environmental problems caused by mass consumption of fossil fuel resources, that is, environmental destruction due to global warming and air pollution are also serious problems.
[0003]
As a means to solve such problems, a power generation method that uses natural power to convert to other power energy without using fossil fuel resources as an energy source, for example, a power generation method that generates electric power is realized. Has been. As a power generation method, a method using sunlight or wind power has been rapidly developed recently, and in particular, a power generation method using sunlight has already been implemented in a wide field such as a house or an electronic device.
[0004]
However, the implementation status of the power generation method using wind power is still insufficient, but recently, the development technology has been remarkably advanced. The reason for this is that the power generation method using wind power can be used even in areas where sunlight is weak, and a large amount of power can be provided compared to the power generation method using sunlight.
[0005]
In general, a power generation method using wind power is a technique for converting rotational energy of a rotating body by wind power into power energy. For this purpose, it is desirable to convert wind power into rotational energy without waste. Conventionally, a wind turbine as shown in FIG. 4 is known for such a demand. That is, the rotating blade 2 attached to the rotating shaft 1 receives wind to rotate the rotating shaft 1, and the rotational energy is converted into electric energy by a power generation source connected to the rotating shaft 1, for example, the generator 3. The shield 4 is attached to the outer periphery of the rotary blade 2 so that the wind in the direction of weakening the rotational force of the rotary shaft 1 does not hit the rotary blade 2. Such a windmill is disclosed in, for example, Patent Literature 1 to Patent Literature 3 below.
[0006]
[Patent Document 1]
JP-A-6-137258 (Applicant: Kiyohiro Furuya)
[0007]
[Patent Document 2]
Japanese Patent Laid-Open No. 10-274148 (Applicant: Andrew Joseph Siembli)
[0008]
[Patent Document 3]
JP-A-11-62813 (Applicant: Zephyr Corporation)
[0009]
[Problems to be solved by the invention]
However, in these prior arts, since the shield 4 is attached in a fixed state, the shielding effect is not constant depending on the wind direction, and rotation irregularities occur in the rotary shaft 1 to obtain stable rotation. There was a problem that it was not possible.
[0010]
Therefore, an object of the present invention is to provide a squirrel-type windmill that can efficiently convert wind power into rotational energy regardless of the direction of the wind.
[0011]
[Means for Solving the Problems]
The squirrel-type windmill according to the present invention includes an internal windmill composed of a plurality of inner rotor blades fixed to a rotary shaft and having a substantially arc-shaped wind receiving surface formed along the rotary shaft, and an outer periphery of the internal windmill. An external wind turbine comprising outer rotor blades of the same number as the inner rotor blades of the inner wind turbine, which is provided so as to be rotatable with respect to the rotary shaft and has a substantially arc-shaped wind receiving surface formed along the rotary shaft. A straight line connecting both ends of a cross section of the outer rotor blade cut by a plane perpendicular to the rotation axis is a straight line extending radially from the rotation axis in a cross section perpendicular to the rotation axis. The angle formed between them is α degrees, and a straight line connecting both ends of the cross section of the inner rotor blade cut by a plane perpendicular to the rotation axis is the cross section perpendicular to the rotation axis. A straight line extending radially from the axis of rotation When angle was beta of forming between the angle alpha, beta is characterized in that it is an angle equal to 45 ° below each other physician.
[0012]
Furthermore, in the squirrel-cage wind turbine of the present invention, the third and fourth supports are rotatably supported by the rotating shaft at a position including the first and second supports inside them. It is characterized by being.
[0016]
Furthermore, in the squirrel-type windmill of the present invention, the third and fourth supports constituting the external windmill are coupled to the rotary shaft via a bearing.
[0017]
Furthermore, in the squirrel-type windmill of the present invention, a power generator is connected to the rotating shaft.
[0018]
Furthermore, in the squirrel-cage wind turbine of the present invention, the rotor blades of the outer wind turbine are supported between the third and fourth supports so that the angle α can be adjusted. .
Furthermore, in the squirrel-cage wind turbine of the present invention, each of the inner rotor blade and the outer rotor blade is constituted by eight rotor blades.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to FIGS.
[0020]
FIG. 1 is a perspective view showing an appearance of a windmill according to an embodiment of the present invention, and FIG. 2 is a longitudinal sectional view of the windmill shown in FIG.
[0021]
The internal windmill 5 includes an upper disk 5A as a first support and a lower disk 5B as a second support, and is fixed to the rotating shaft 9 by fixing members 15A and 15B, respectively. Between the upper disk 5A and the lower disk 5B, a plurality of rotating blades having a substantially arc-shaped horizontal cross section are supported so as to be arranged radially around the rotating shaft 9.
[0022]
On the other hand, the external wind turbine 6 includes an upper disk 6A that is a third support and a lower disk 6B that is a fourth support, and is rotatably supported around the rotation shaft 9 by bearings 16A and 16B, respectively. Has been. Between these upper disk 5A and lower disk 5B, a plurality of substantially semi-cylindrical rotor blades are supported so as to be radially arranged around the inner wind turbine 5.
[0023]
As shown in FIG. 3, the generator 12, which is an example of a device for using the rotational force of the windmill, is covered with a support housing 14. A rotating shaft 9 integrated with the rotating shaft of the generator 12 is rotatably supported by a support housing 14 by a bearing 13.
[0024]
FIG. 3 is a plan view showing the shape of the rotor blades and the blade arrangement state in the internal wind turbine 5 and the external wind turbine 6 shown in FIG.
[0025]
As shown in the figure, eight rotor blades 7 of the internal wind turbine 5 and eight rotor blades 8 of the external wind turbine 6 are provided. The sections obtained by cutting these rotor blades along a horizontal plane, that is, a plane perpendicular to the rotation axis 9, are each arc-shaped, and straight lines L1 and L2 connecting both ends thereof are diameters passing through the centers of the upper disks 5A to 6A, that is, In a plane perpendicular to the rotation shaft 9, they are arranged at a predetermined angle with respect to a straight line L <b> 3 extending radially from the rotation shaft 9. That is, each of the rotor blades 7 and 8 has a straight line L1, L2 connecting both ends of each horizontal section thereof not on the straight line L3 extending in the radial direction from the center of the upper disks 5A and 6A, but at a predetermined angle. Each is mounted and arranged at an inclined position. Here, these predetermined angles are α ° for the rotor blades 8 of the external wind turbine 6 and β ° for the rotor blades 7 of the internal wind turbine 5.
[0026]
In order to confirm the effect of the squirrel-cage wind turbine of the present invention configured as described above, the inventor manufactured a model according to the above-described embodiment, and performed an operation experiment as described below. First, the shape of the external wind turbine and the internal wind turbine are set to the following numerical conditions:
The dimensions of the external windmill are
Outer diameter = 150mm
Inner diameter = 86mm
Length of rotor blade = 95mm
The size of the internal windmill is OD = 80mm
Inner diameter = 50mm
Length of rotor blade = 70mm
The mounting arrangement angles α and β of the rotary blades were set to 25 ° at the same angle.
[0027]
And the rotation speed of the windmill was observed by measuring the output of the generator 12. First, in order to confirm the effect of the external wind turbine 6 in the squirrel-type wind turbine of the present invention, the case where the external wind turbine 6 is rotated and the case where the external wind turbine 6 is not rotated, that is, the case where the external wind turbine 6 is fixed are used by the same wind force. The windmill 5 was rotated and the output of the generator 12 in each case was measured. As a result, the average output voltage of the generator 12 when the external wind turbine 6 is rotated is about 3.0 volts (V), whereas the average output voltage when the external wind turbine 6 is fixed is about 2-2. .5 volts (V), and the voltage varied depending on the wind direction. From this experimental result, it was confirmed that the external wind turbine 6 rotating around the rotation axis together with the internal wind turbine 5 further increases the rotational speed of the internal wind turbine 5. Furthermore, it has been confirmed that the output voltage of the generator 12 when the external wind turbine 6 is rotated is always stable against changes in the wind direction.
[0028]
Thus, when the external windmill 6 is rotated, it is estimated that the rotation efficiency is good for the following reason. That is, when the flow of wind passing through the squirrel-type windmill is observed, the wind enters from one of the external windmills 6 to rotate the internal windmill 5 and flows out from the opposite side of the internal windmill 5 to the outside. At this time, if it is assumed that the rotor blades 8 of the external wind turbine 6 do not exist, a smooth wind flow with the least resistance can be formed. Therefore, by rotating the external wind turbine 6, it appears that a state close to the state in which the rotor blade 8 of the external wind turbine 6 does not exist apparently appears. It is also presumed that by rotating the external wind turbine 6, the rotor blade 8 acts to draw in the air introduced into the internal wind turbine 5 and to discharge the air to the outside of the internal wind turbine 5. As a result, the resistance to the flow of the wind passing through the internal wind turbine 5 is weakened or the wind can be used efficiently by promoting the flow. In addition, since the function of the external wind turbine 6 functions under the same conditions with respect to the wind from any direction, a stable rotational state can always be realized even if the direction of the wind fluctuates.
[0029]
In any case, it is obvious that rotating the external wind turbine 6 plays an important role in obtaining a stable rotational speed against an increase in the rotational speed and fluctuations in the wind direction.
[0030]
In addition, the present inventors set the mounting angles α and β of the rotary blades 8 of the external wind turbine 6 and the rotary blades 7 of the internal wind turbine 5 respectively.
0 ° ≦ α ≦ 45 °, 0 ° ≦ β ≦ 45 °
As a result, the rotation efficiency of the internal wind turbine 5 was the highest when α≈β.
[0031]
In addition, this invention is not limited to said embodiment, A various deformation | transformation is possible. For example, the internal wind turbine 5 can be protected from strong winds exceeding the allowable range by changing the attachment angle α of the rotor blades 8 of the external wind turbine 6 according to the wind strength, or the internal wind turbine 5 can be rotated. The power can be controlled. As a result, the reliability as a power generation device can be improved.
[0032]
It is also possible to transmit the rotation of the external wind turbine 6 that rotates independently of the rotation of the internal wind turbine 5 to another generator for use in power generation.
[0033]
Further, in the above embodiment, the number of the rotor blades 7 of the internal wind turbine 5 and the rotor blades 8 of the external wind turbine 6 is eight, but the present invention is not limited to this. is there.
[0034]
【The invention's effect】
According to the present invention described above, the rotation efficiency of the internal wind turbine can be improved by rotating the external wind turbine. Further, it is possible to always ensure stable rotation of the internal wind turbine without being influenced by the direction of the wind.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an appearance of a cage type windmill according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view of the squirrel-type windmill shown in FIG.
3 is a plan view showing an arrangement state of rotor blades in the squirrel-type windmill of FIG. 1. FIG.
FIG. 4 is a perspective view showing a configuration of a conventional cage type windmill.
[Explanation of symbols]
5 Internal wind turbine 5A Upper disk 5B Lower disk 6 External wind turbine 6A Upper disk 6B Lower disk 7, 8 Rotating blade 9 Rotating shaft 13, 16A, 16B Bearing 14 Support housing 15A, 15B Fixing member

Claims (7)

An internal wind turbine composed of a plurality of inner rotor blades fixed to the rotary shaft and having a substantially arc-shaped wind receiving surface formed along the rotary shaft, and rotates with respect to the rotary shaft in the outer periphery of the internal wind turbine An external wind turbine comprising the same number of outer rotor blades as the inner rotor blades of the inner wind turbine, which is provided freely and has a substantially arc-shaped wind receiving surface formed along the rotation axis, An angle formed between a straight line connecting both ends of a cross section cut by a plane perpendicular to the rotation axis and a straight line extending radially from the rotation axis in the cross section perpendicular to the rotation axis is α degrees. Further, a straight line connecting both ends of the inner rotor blade in a cross section cut by a plane perpendicular to the rotation axis is a straight line extending radially from the rotation axis in the cross section perpendicular to the rotation axis. The angle between When the angle alpha, beta the car windmill, characterized in that the angle equal to 45 ° below each other physician. The internal wind turbine includes first and second supports that are fixed to the rotating shaft so as to be spaced apart from each other, and the plurality of inner rotor blades are supported between the first and second supports. And the external wind turbine includes third and fourth supports that are spaced apart from each other on the rotation shaft and that are rotatably provided with respect to the rotation shaft. The squirrel-cage wind turbine according to claim 1, wherein the outer rotor blade is supported between the third and fourth support bodies. 3. The third and fourth supports are rotatably supported by the rotary shaft at a position where the first and second supports are included inside thereof. The described cage-type windmill. The squirrel-cage wind turbine according to claim 3, wherein the third and fourth supports constituting the external wind turbine are coupled to the rotating shaft via a bearing. The squirrel-cage wind turbine according to claim 4, wherein a power generator is connected to the rotating shaft. The squirrel-cage wind turbine according to claim 5, wherein the rotor blades of the outer wind turbine are supported between the third and fourth supports so that the angle α can be adjusted. The squirrel-cage wind turbine according to claim 2, wherein each of the inner rotor blade and the outer rotor blade includes eight rotor blades.

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