JP2003293928A - Savonius windmill - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a Savonius windmill having a structure wherein rotation performance of blades further improved than the prior art. <P>SOLUTION: Each of blades 6 and 7 is formed in a center side swelling shape, and a bending degree of a wind discharging surface 4 is higher than that of a wind receiving surface 3. The wind receiving surface 3 of one blade is formed in a bending shape where air quantity flowing on the wind receiving surface 3 side of the other blade is higher than that flowing in the opposite direction. The wind discharging surface 4 of each blade is formed in a bending shape where air quantity flowing on the wind receiving surface 3 side of the other blade is higher than that flowing in the opposite direction. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a Savonius type wind turbine.

[0002]

2. Description of the Related Art General Savonius type wind turbine 51
As shown in FIG. 2, the basic form of the two blades 52, 5 is
2, each of the blades 52, 52 is conventionally provided with
As shown in detail in FIG. 3, the plate is formed by bending the plate into an arc, and the wind receiving surface 53 of the concave arc and the wind escape surface 54 of the convex arc have the same degree of bending, and
The center side and both side sides in the arc direction were formed to have the same wall thickness.

By the way, in the Savonius type wind turbine 51, the blades 52, 52 rotate for the following reason. That is, first, when the wind 55 blows, one blade 56
The force received by the concave arc wind receiving surface 53 and the force received by the convex arc wind escape surface 54 of the other blade 57 are different from each other, and the former force is larger than the latter force. In addition, the wind 58a that tries to escape to one of the two sides by the concave arc wind receiving surface 53 of the one blade 56 is received by the concave arc wind receiving surface 53 of the other blade 57. Thirdly, the convex arc wind escape surface 54 of the other blade 57 receives wind 59a that escapes to one of the two sides by the concave arc wind receiving surface 53 of the one blade 56. Is.

In the Savonius-type wind turbine in which the blades rotate according to such a principle, an object of the present invention is to provide a Savonius-type wind turbine having a structure in which the rotation performance of the blades can be further improved as compared with the prior art.

[0005]

Means for Solving the Problems The above-mentioned problems are formed in a bulging blade on the center side in which the center side in the bending direction of each blade is set to have a larger thickness dimension than the side portions on both sides.
This is solved by a Savonius type wind turbine characterized in that the degree of bending of the wind escape surface is formed larger than the degree of bending of the wind receiving surface.

With this structure, it is possible to increase the difference between the force received by the wind receiving surface of one blade and the force received by the wind releasing surface of the other blade, thereby improving the rotational performance of the blade with respect to the wind. It can be improved further than ever before.

That is, as the degree of bending of the wind escape surface increases, the effect of releasing the wind increases, but if the degree of bending of the wind receiving surface also increases,
The wind-receiving surface receives less force from the wind. On the other hand,
If the degree of bending of the wind receiving surface is reduced to increase the force received from the wind and the degree of bending of the wind escape surface is also reduced in the same manner, the effect of the wind escape surface to escape the wind becomes low. That is, if one is struck, the other will not be struck.

Therefore, in the present invention, as described above,
The degree of bending of the wind-blowing surface is increased to make it easier for the wind-releasing surface to escape the wind, while the degree of bending of the wind-receiving surface is made smaller to increase the force that the wind-receiving surface receives from the wind. is there. As a result, the effect due to the above first reason can be enhanced and the rotational performance of the blade with respect to the wind can be improved.

In such a Savonius wind turbine, when the blades are made of aluminum multi-hole hollow extruded material,
Due to the material effect of aluminum and the shape effect of hollow, the blade can be lightened, and the blade having high strength can be obtained by the reinforcing effect of the partition wall between the holes. It can be produced with good productivity and easily.

Further, in the above Savonius type wind turbine,
Alternatively, in other Savonius wind turbines, the wind receiving surface of each blade is formed in a curved shape that makes the amount of air flowing toward the wind receiving surface of the other blade larger than the amount of air flowing in the opposite direction. The force acting on the wind receiving surface of the other blade becomes large, and the effect due to the above second reason can be enhanced, and the rotational performance of the blade with respect to the wind can be improved.

Further, in the Savonius type wind turbine described above,
Alternatively, in other Savonius wind turbines, when the wind escape surface of each blade is formed in a curved shape that makes the amount of air flowing toward the wind receiving surface of the other blade greater than the amount of air flowing in the opposite direction. The force acting on the wind receiving surface of the other blade is increased, the effect due to the third reason described above can be enhanced, and the rotational performance of the blade with respect to the wind can be improved.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings.

The blades 2 and 2 of the Savonius-type wind turbine 1 of the first embodiment are each made of a porous hollow extruded material of aluminum. As shown in FIG. 1A, the center side in the bending direction is the side of both sides. The thickness is set larger than that of the blade, and the blade is formed in a bulge shape on the center side, the wind escape surface 4 is formed in a convex arc surface, and the wind receiving surface 3 is formed in a concave arc surface, and The degree of bending of the wind escape surface 4 is
The wind receiving surface 3 is formed to be larger than the degree of bending.
Then, in the hollow portion, the wall on the side of the wind receiving surface 3 and the wall on the side of the wind escape surface 4 are integrally connected by partition walls 10.

In the Savonius type wind turbine 1, since the degree of bending of the wind escape surface 4 is formed to be larger than the degree of bending of the wind receiving surface 3, as compared with the case where the degree of bending is the same, By the wind 5, the difference between the force received by the wind receiving surface 3 of the one blade 6 and the force received by the wind escape surface 4 of the other blade 7 can be increased, and the effect for the first reason described above can be obtained. It is possible to improve the rotation performance of the blades 2 and 2 against the wind.

The blades 2 and 2 of the Savonius-type wind turbine 1 of the second embodiment shown in FIG. 1B have the characteristics of the first embodiment described above, and further, the wind receiving surface of the one blade 6 is further provided. 3 is formed in a curved shape so that the air volume 8a flowing toward the wind receiving surface 3 side of the other blade 7 is larger than the air volume 8b flowing in the opposite direction. As a result, the same effect as in the case of the first embodiment can be achieved, and the force acting on the wind receiving surface 3 of the other blade 7 can be increased, and the effect due to the second reason described above. Can be improved, and the rotational performance of the blades 2 and 2 against the wind can be further improved.

Further, in the second embodiment, the air flow surface 4 of the other blade 7 has an air flow amount 9a flowing toward the wind receiving surface 3 side of the one blade 6 and an air flow amount 9b flowing in the opposite direction. It is formed in a curved shape that makes it more than that.
As a result, not only the same effects as in the case of the first embodiment and the effects due to the second reason are obtained, but also the force acting on the wind receiving surface 3 of the one blade 2, 2 can be increased. Therefore, the effect due to the third reason described above can be enhanced, and the rotation performance of the blades 2 and 2 against the wind can be further improved.

Although the embodiment of the present invention has been described above, the present invention is not limited to this, and various modifications can be made without departing from the spirit of the invention. For example, in the above-described second embodiment, the effect due to all the first to third reasons is enhanced, but the effect due to the second reason and / or the third reason is enhanced, and the effect due to the first reason is A conventional configuration may be used. That is, as in the past,
Make the thickness of the blade the same in both the center and both sides,
The degree of bending of the wind receiving surface of each blade is the same as that of the air releasing surface, and the air releasing surface of each blade causes more air flow to the side of the air receiving surface of the other blade than to flow in the opposite direction. The wind-receiving surface of each blade changes the amount of air flowing toward the wind-receiving surface side of the other blade, with or without a configuration in which it is formed into a curved shape. It is also possible to adopt a configuration in which the air flow amount is greater than the amount of air flowing in the opposite direction.

[0018]

Since the present invention is as described above, it is possible to further improve the rotation performance of the blades as compared with the conventional case.

[Brief description of drawings]

FIG. 1A is a cross-sectional view of a blade of a Savonius-type wind turbine of the first embodiment, and FIG. 1B is a cross-sectional view of a blade of a Savonius-type wind turbine of a second embodiment.

FIG. 2 is a perspective view showing a basic form of a Savonius-type wind turbine.

FIG. 3 is a cross-sectional view of blades of a conventional Savonius type wind turbine.

[Explanation of symbols]

1 ... Savonius type windmill 3… Wind receiving surface 4… Wind escape surface 6 ... one blade 7 ... the other blade 10 ... Partition

Continued front page    (72) Inventor Jiro Tsukahara             3-5 Umeda, Kita-ku, Osaka City, Osaka Prefecture             Wa House Industry Co., Ltd. F-term (reference) 3H078 AA07 AA26 BB11 CC02

Claims (6)

[Claims] 1. The center side in the bending direction of each blade is formed in a bulging blade on the center side with the thickness dimension set to be larger than that of both side parts, and the degree of bending of the wind escape surface is the bending of the wind receiving surface. Savonius type wind turbine characterized by being formed larger than the degree of. 2. The Savonius-type wind turbine according to claim 1, wherein the blade is made of a multi-hole hollow extruded material of aluminum. 3. The wind receiving surface of each blade is formed in a curved shape so that the amount of air flowing toward the wind receiving surface of the other blade is larger than the amount of air flowing in the opposite direction.
Alternatively, the Savonius-type wind turbine described in 2. 4. The wind escape surface of each blade is formed in a curved shape so that the amount of air flowing toward the wind receiving surface of the other blade is larger than the amount of air flowing in the opposite direction. The Savonius-type wind turbine described in any one of 1. 5. The savonius characterized in that the wind receiving surface of each blade is formed in a curved shape so that the amount of air flowing toward the wind receiving surface of the other blade is larger than the amount of air flowing in the opposite direction. Type windmill. 6. The wind escape surface of each blade is formed in a curved shape so that the amount of air flowing toward the wind receiving surface of the other blade is larger than the amount of air flowing in the opposite direction. Savonius type windmill.