JP2011085080A - Wind turbine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that manufacturing cost is high since mechanisms of a wind indicating blade and a mechanical connecting mechanism are complicated and that much labor and cost are required for maintenance although a wind turbine capable of varying angles of a vertical blade in upwind progress and in leeward progress by a wind indicating blade, a pulley, a belt, a connecting rod or the like is devised for increasing torque of a vertical blade type wind turbine. <P>SOLUTION: In this wind turbine (a), four upper and lower arms 3 radially extend from a center shaft. Bearings are provided on the upper and the lower arms 3. Rotary shafts 4 are provided on blades 1a, 1b, 1c and 1d. Rotary angle of a variable blade is controlled by a stopper 6 so as to vary angles. The blade is automatically set by the stopper to keep right angles with wind in progress to a leeward side. A wind power generator generating large torque even when wind speed is low and efficiently generating power is materialized thereby. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a wind turbine in which individual variable blades (hereinafter referred to as blades) can be varied without a mechanical interlocking mechanism at an angle of attack that makes it easy to obtain rotational torque with respect to the wind direction.

In order to increase the rotational torque at low wind speeds, the vertical blades have been devised so that the following method has been announced.

JP-A-7-294663 JP2007-285289A JP2009-114975A

  However, each of the above documents is a mechanism provided with a wind vane to make the blade variable, and provided with a pulley and a belt or a connecting rod interlocking between the central shaft and the blade, and the structure is complicated. There is a problem that the manufacturing cost is increased, failure is likely to occur, and maintenance costs are increased.

  The problem to be solved by the present invention is a wind turbine having a blade rotating around a vertical center shaft, without having a mechanical mechanism such as a pulley, a belt, or a connecting rod between the center shaft and the blade, It is an object of the present invention to make the blade variable so that the wind receiving area becomes larger and the drag becomes larger when the blade advances on the leeward side.

  The present invention has been made in order to solve the above-mentioned problems. The blade is provided with a rotating shaft, and a stopper that regulates the rotation angle of the blade automatically makes the blade perpendicular to the wind when traveling to the leeward side. It is something to keep. By using this mechanism, when the blades are traveling to the leeward side without providing mechanical linkage mechanisms such as a wind vane and a pulley that connects the central shaft and each blade and a belt or connecting rod. This realizes a wind turbine for a generator that generates an angle change so that the wind receiving area becomes large, the drag increases, and can generate power with high efficiency, particularly at a low wind speed.

  The invention according to claim 2 includes two upper and lower arms for supporting a plurality of (usually 3 to 4) blades radially from a vertical central shaft, and the blades supported by the arms are The wind turbine is characterized in that a rotation shaft for rotation is provided, and a stopper for restricting the rotation angle of the blade is provided on the arm.

  According to the second aspect of the present invention, the blade moving toward the leeward side is automatically changed in angle so that the wind receiving area is increased, the drag is increased, and the efficiency is high particularly at a low wind speed. This can improve the power generation capacity.

  According to a fourth aspect of the present invention, a plurality of shafts are arranged radially from a vertical central shaft, and a blade having a rotation shaft is inserted into the shaft so as to be rotatable around the horizontal shaft. The wind turbine is characterized in that a stopper for regulating the rotation angle of the blade is provided on the shaft.

According to the invention described in claim 4, as in the case of claim 2, when the blade advances toward the leeward side, the angle is automatically changed so that the wind receiving area is increased, and the drag is increased. Although the power generation capacity can be improved with high efficiency at a low wind speed, the upper and lower arms for supporting the blade are not required and the structure is simplified.

According to the present invention, a wind vane is unnecessary, and a mechanical mechanism in which a central shaft and a blade are interlocked with a pulley and a belt or a connecting rod is unnecessary, and the angle of the rotary vane can be changed with a simple configuration. A wind turbine with high power generation efficiency can be provided.

It is a top view which shows Example 1 of the windmill of this invention, and the arrow has shown the flow of the wind. The arrow A of the windmill of FIG. 1 is shown. It is a top view which shows Example 2 of the windmill of this invention, and the arrow has shown the flow of the wind. Fig. 4 shows a side view of the windmill of Fig. 3. The arrow B of the windmill of FIG. 3 is shown. Shows arrow C of the windmill in FIG.

  Hereinafter, the windmill of the present invention will be described in more detail on the basis of an example (Example 1).

1 and 2 are views showing an embodiment of a wind turbine according to the second aspect of the present invention. FIG. 1 is a plan view, and FIG.

  The windmill a according to the present embodiment projects four arms 3 vertically from the center shaft 2 in a radial manner. The upper and lower arms 3 are provided with bearings 5, and the rotating shafts 4 provided on the four blades 1a, 1b, 1c, and 1d having an airfoil cross section are inserted into the bearings 5 so as to be rotatable. In this case, in the state of the blade 1a, the rotating shaft 4 is attached so as to be located on the windward side of the center of gravity of the blade 1a in the state of the blade 1a. A stopper 6 for restricting the rotation angle of the blades 1a, 1b, 1c, 1d is fixed to the lower arm 3. The stopper 6 is mounted at a position that is substantially perpendicular to the wind flow in the blade 1c so that the blade 1a is substantially parallel to the wind flow in the blade 1a state. In order to reduce the impact when the blades 1a, 1b, 1c and 1d come into contact with the stopper 6, a buffer ring made of rubber or the like is attached around the metal rod.

Thus, when the wind blows from the direction shown in FIG. 1 to the wind turbine a thus configured, the four blades 1a, 1b, 1c and 1d rotate clockwise around the central shaft 2 as viewed from above. Rotate. At this time, the blade 1a traveling to the windward side is kept substantially parallel to the wind flow by the stopper 6, and a rotational force due to lift is generated in the blade 1a.

The blade 1b rotates slightly counterclockwise as viewed from above due to the moment caused by the drag force of the wind, and the blade 1b is not in contact with the stopper 6. In the blade 1c, since the stopper 6 is positioned leeward of the blade with respect to the rotating shaft 4 of the blade, the blade 1c is substantially perpendicular to the wind flow, and may be received depending on the shape of the blade as compared with the case of being parallel to the wind flow. The wind area increases 10 times or more, the drag increases proportionally, and a large rotational force is generated.
Although the cross section of the arm of the present embodiment is a rectangular plate shape, by making the cross section into a wing shape, the drag force when traveling upwind is reduced and the rotational force is further increased.

  When such a wind turbine according to the first embodiment is used as power for a wind power generator, a wind power generator capable of generating large torque even at a low wind speed and generating power efficiently is realized.

3, 4, 5 and 6 are views showing a wind turbine b according to an embodiment (Embodiment 2) of the invention of claim 4, FIG. 3 is a plan view, FIG. 4 is a side view, and FIG. View B is shown in FIG. Four horizontal shafts 7 are arranged radially from the top of the vertical central shaft 2 substantially horizontally. A blade 1a, blade 1b, blade 1c, and blade 1d having an airfoil cross section include a rotary shaft 4 and a bearing 5 by a bearing. A horizontal shaft 7 is inserted into the bearing 5, and each blade is placed around the horizontal shaft 7. Make it rotatable. The rotating shaft 4 is arranged in the state of the blade 1a so as to be located on the windward side from the center of gravity of the blade 1a as shown in FIG. Further, a stopper mounting plate 9 is attached to each horizontal shaft 7, and one stopper 6 is mounted on each of the stopper mounting plates 9 up and down. As shown in FIG. 5, in the state of the blade 1a, the upper stopper 6 is arranged so that the leeward end of the blade 1a is slightly above the leeward end. In the state of the blade 1c, the lower stopper 6 is disposed so that the blade 1c is substantially vertical as shown in FIG.

In the wind turbine b configured in this manner, the blade 1a traveling on the windward side is kept substantially parallel to the wind flow by the stopper 6 as in the first embodiment, and the blade 1a has a rotational force due to lift. Will occur. The blade 1c traveling on the leeward side generates a moment around the rotating shaft 4 due to the drag force of the wind, the end on the leeward side rotates upward, and the stopper 6 becomes substantially perpendicular to the wind flow. At this time, depending on the shape of the blade, the wind receiving area is increased by 10 times or more, the drag is increased proportionally, and a large rotational force is generated, as compared with the case parallel to the wind flow. Compared with the first embodiment, the present embodiment does not require an arm for supporting the rotor blades at the top and bottom, and therefore has an advantage of simplifying the structure.

As described in the first embodiment and the second embodiment, the wind turbine of the present invention can efficiently convert wind energy into a rotational force with a simple mechanism. It is possible to provide a wind power generator that generates a large amount of electricity at a low cost.

a windmill b windmill 1a blade 1b blade 1c blade 1d blade 2 central shaft 3 arm 4 rotating shaft 5 bearing 6 stopper 7 horizontal shaft 8 end plate 9 stopper mounting plate

Claims (4)

      A windmill characterized in that the rotation angle of a plurality of variable blades that rotate around a vertical rotating shaft is controlled by a stopper so that it is substantially parallel to the flow of the wind when traveling upwind and substantially at a right angle when traveling downwind. .       A rotating shaft is provided between the upper and lower arms of a plurality of upper and lower arms that project radially from a vertical rotating shaft, and a variable blade that can be rotated is attached to the rotating shaft, and the rotation angle of the variable blade is adjusted to the arm. The windmill according to claim 1, further comprising a stopper to be regulated.   The wind turbine according to claim 2, wherein the cross-sectional shape of the upper and lower arms is an airfoil. A variable wing that is rotatable around a plurality of shafts that extend radially from the top of a vertical rotating shaft is attached, and a stopper that regulates the rotation angle of the variable wing is provided. The windmill according to 1.

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