JP2004060576A - Windmill - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vertical shaft windmill capable of preventing a damage thereto by an abrupt wind or a strong wind from occurring and reducing a load on a generator even when used for wind power generation. <P>SOLUTION: For example, in a Savonius windmill 7, a rotating shaft 6 is tilted in the direction of wind by a wind force received by the windmill. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a windmill used for wind power generation and the like.
[0002]
[Prior art and problems]
Vertical axis wind turbines, such as the Savonius type, whose rotation axis is oriented perpendicular to the wind direction, may be damaged by a large load due to gusts or strong winds, or may be damaged by vibration due to high rotation of the rotating body. It can happen.
[0003]
In addition, when a vertical axis windmill is used for wind power generation, if the strong wind continues for a long time, the load on the generator coil may be increased and the generator may be damaged.
[0004]
The present invention has been made in view of the above-described problems, and has an object to provide a wind turbine that can prevent breakage due to gusts and strong winds and can reduce the load on a generator even when used for wind power generation. And
[0005]
[Means for Solving the Problems]
The above object is attained by a vertical axis type wind turbine characterized in that the wind axis is inclined by the wind force so as to follow the direction of the wind.
[0006]
In this vertical wind turbine, when a gust or strong wind is received, the rotating shaft is inclined to follow the wind direction, so that the received load is kept small, and the rotating body is prevented from rotating at a high speed. Damage is prevented.
[0007]
In addition, since the rotating shaft is tilted using the natural energy of wind power, there is no need for a wind sensor, drive mechanism, control mechanism, etc., and it can be realized cost-effectively with a simple mechanism. Can be.
[0008]
In the above-described vertical wind turbine, when the urging means for urging the rotating shaft to return to the original position when the rotating shaft is tilted is provided, when the wind weakens, the rotating shaft returns to the original position and rotates. The body can be rotated efficiently.
[0009]
When the above-mentioned vertical windmill is used for wind power generation, even when strong winds continue for a long time, high rotation of the rotating body is suppressed by the inclination of the rotating shaft as described above, and the load on the generator is reduced. Can be. When the above-mentioned urging means is provided, when the wind weakens, the rotating shaft returns to the original position, and the rotating body can be efficiently rotated to generate power efficiently.
[0010]
Also, in the case of a horizontal axis type wind turbine, when the rotation axis is inclined with respect to the wind direction by the wind force by receiving the wind, the wind turbine can be similarly prevented from being damaged. A simple mechanism can be implemented advantageously in terms of cost, and when used for power generation, the load on the generator can be reduced.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, an embodiment of the present invention will be described with reference to the drawings.
[0012]
The vertical windmill 7 according to the first embodiment shown in FIGS. 1 and 2 is a Savonius-type windmill, and the impeller 1 as a rotating body has a rectangular frame 2 with its rotating shaft 6 directed vertically. Are rotatably held by the upper frame 2a and the lower frame 2b. The upper end side of the rectangular frame 2 is pivotally supported by the left and right legs 3 and 3 so as to allow a pendulum movement. Reference numeral 4 denotes a power generation unit, and reference numeral 5 denotes a power storage unit. When the impeller 1 rotates by receiving wind, the power generation unit 4 generates power, and electricity is stored in the power storage unit 5. In addition, the power generation unit 4 and the power storage unit 5 may be provided in the rectangular frame 2 or may be provided in another place.
[0013]
In this vertical windmill 7, as shown in FIG. 3A, when a gust or strong wind W1 is received, the rotating shaft 6 of the impeller 1 is inclined so as to follow the wind direction. Thereby, the load which impeller 1 receives from wind W1 is suppressed small, and the high rotation of impeller 1 is also suppressed, whereby breakage of vertical windmill 7 due to gusts or strong wind W1 is prevented. Further, as described above, the rotating shaft 6 is inclined by the gust or the strong wind W1, and the high rotation of the impeller 1 is suppressed, so that the load on the power generation unit 4 is reduced.
[0014]
When the rotating shaft 6 of the impeller 1 is inclined as described above, the own weight G of the impeller 1 and the rectangular frame 2 serves as a biasing means, and the impeller 1 and the rectangular frame 2 are in a vertical state without inclination. When the gust or strong wind W1 stops and returns to the normal wind W2 as shown in FIG. 2 (b), the impeller 1 and the rectangular frame 2 are in a vertical state with no inclination or After returning to the state where the inclination is small, the impeller 1 performs normal and efficient rotation, and the power generation unit 4 also performs efficient power generation.
[0015]
As shown in FIG. 3B, the rotating shaft 6 hardly tilts in a normal wind W2, and the rotating shaft 6 tilts as shown in FIG. 3A in a gust or strong wind W1. Alternatively, a method of setting the total weight of the rectangular frame 2 and the impeller 1 to a specific weight, or setting the rotational resistance and the like of the rectangular frame 2 to a specific resistance value may be adopted.
[0016]
Further, in the above-described vertical windmill 7, the own weight G of the impeller 1 and the rectangular frame 2 is used as the urging means. You may make it provide as an urging means.
[0017]
The second embodiment shown in FIG. 4 (a) is also a Savonius type windmill, in which the upper end of an impeller 1 is hung rotatably in a bell shape, and a rotating shaft 6 responds to wind in all directions. It is made to incline in the direction of the wind. The lower end of the impeller 1 is received in the spherical recess 9a of the tray 9, and a stopper 9b is provided around the entire circumference of the spherical recess 9a. As shown in FIG. The angle range in which the impeller 1 can be tilted is restricted so that W1 does not blow and the impeller 1 does not come into contact with the support 10 or surrounding installations. In addition, the lower end of the impeller 1 may be in contact with the spherical portion 9a of the concave portion of the tray 9, or may be non-contact.
[0018]
The third embodiment shown in FIG. 5 is also based on a Savonius type windmill, in which the lower end of a rectangular frame 2 that rotatably holds an impeller 1 is connected to the upper end of a spring leg 11, and the rotating shaft 6 is omnidirectional. In response to the wind, it is inclined in the direction of the wind. 16 is a lower base. In the present embodiment, the spring leg 11 also plays a role of an urging means, and this spring leg 11 may be made of a coiled wire, may be made of a linear wire, or may be inclined in one direction. When configured as a type, it may be made of a leaf spring, and its form is not particularly limited.
[0019]
The fourth embodiment shown in FIG. 6 (a) is a case where the present invention is applied to a horizontal axis type wind turbine in which the rotation axis 6 is directed parallel to the wind direction, and the wind turbine 12 is composed of a propeller type wind turbine, The extended upper end of the arm 13 is rotatably connected to the upper base 14 and is suspended. When a gust or strong wind W1 blows, the windmill 12 rotates rearward and the rotating shaft 6 is inclined with respect to the wind direction, as indicated by the imaginary line in FIG. Due to this inclination, the load that the propeller 15 as a rotating body receives from the wind W1 is suppressed small, and the high rotation of the propeller 15 is also suppressed, thereby preventing the wind turbine 12 from being damaged by a gust or strong wind W1. Further, as described above, the rotating shaft 6 is inclined by the gust and the strong wind W1, and the high rotation of the propeller 15 is suppressed, so that the load on the power generation unit 4 is reduced. When the rotating shaft 6 of the windmill 12 is tilted as described above, the own weight G of the windmill 12 and the arm 13 becomes an urging means, and when the gust or strong wind W1 stops and returns to the horizontal state by the urging force F, the propeller 15 Normal efficient rotation is performed, and the power generation unit 4 also performs efficient power generation.
[0020]
The fifth embodiment shown in FIG. 6 (b) relates to a propeller-type wind turbine 12, and similarly to the above-described third embodiment, the spring legs 11 also serving as urging means extend downward. That is, it is connected to the lower base 16.
[0021]
Although the embodiment has been described above, the present invention is not limited to this, and various changes can be made without departing from the spirit of the invention. For example, in the above-described embodiment, the case where the wind turbine is configured as a power generation wind turbine is shown. However, even when the wind turbine is used for other purposes, it is possible to prevent the wind turbine from being damaged by gusts and strong winds. It does not matter whether the windmill is for power generation or not. Further, in the above-described embodiment, the case is shown in which the rotating body inclined in response to the gust or the strong wind W1 is configured to return to the vertical state by the urging means when the wind stops or weakens. In response to this, the inclined rotating body may be configured to maintain the angle of inclination by frictional force or locking force even after the wind stops or weakens. Further, in the above embodiment, the case where the Savonius type windmill is used as the vertical windmill is shown. However, the present invention is not limited to this. It can be widely applied to Also, the horizontal axis type wind turbine can be widely applied to wind turbines other than the propeller type wind turbine.
[0022]
【The invention's effect】
Since the present invention is as described above, it is possible to prevent breakage due to gusts and strong winds, and furthermore, it does not require a wind sensor, a driving mechanism, a control mechanism and the like, and is simple and cost-effective. Can be realized. Further, the load on the generator can be reduced by using it for wind power generation.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a vertical axis wind turbine according to a first embodiment.
FIG. 2A is a front view, and FIG. 2B is a side view.
FIGS. 3A and 3B are side views showing the operation of the windmill.
FIG. 4A is a side view showing a vertical axis type wind turbine according to a second embodiment, and FIG. 4B is a side view showing its operation.
FIG. 5A is a side view showing a vertical axis wind turbine according to a third embodiment, and FIG. 5B is a side view showing the operation thereof.
FIG. 6A is a side view showing a horizontal axis wind turbine according to a fourth embodiment, and FIG. 6B is a side view showing a horizontal axis wind turbine according to a fifth embodiment.
[Explanation of symbols]
1. Impeller (rotating body)
4 Power generation unit 6 Rotating shaft 7 Savonius type windmill (vertical axis windmill)
11 ... spring leg (biasing means)
12 ... Propeller type windmill (horizontal axis type windmill)
15 ... Propeller (rotating body)
G: Own weight (biasing means)
W1: Gust and strong wind W2: Normal wind

Claims (4)

A vertical axis windmill characterized in that the wind axis is inclined by receiving the wind so that the rotation axis follows the wind direction. The vertical axis wind turbine according to claim 1, further comprising an urging means for urging the rotating shaft to return to the original position when the rotating shaft is inclined. The vertical axis type wind turbine according to claim 1 or 2 for wind power generation. A horizontal axis type windmill characterized in that the wind axis causes the rotation axis to incline with respect to the wind direction by receiving the wind.

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