JP2023152504A - wind power generator - Google Patents

Abstract

To provide a wind power generator capable of smoothly rotating a vertical rotational shaft.SOLUTION: A wind power generator 1 comprises: a vertical rotational shaft 3 that transmits rotational force to a power generation motor 7; a plurality of arms 4 extending radially from the vertical rotational axis 3 at equal intervals; and a plurality of blades 5 provided at the tip part of each arm 4. The blade 5 has a wind receiving panel (receiving plate) 51 whose outside surface is curved in a concave shape, and a curved airflow storage part 52 formed so as to protrude forward in a rotational direction of the wind receiving panel 51, where the height positions of the blades 5 adjacent to each other in the rotational direction are made different.SELECTED DRAWING: Figure 2

Description

The present invention relates to a vertical axis type wind power generator.

The types of wind turbines used in wind power generators are roughly divided into two types: horizontal axis wind turbines whose rotation axis is horizontal to the wind direction, and vertical axis wind turbines whose rotation axis is perpendicular to the wind direction. Among these, vertical axis wind turbines are omnidirectional, rotating regardless of the wind direction, and have the advantages of a simple structure and low cost, as well as low circumferential speed of the blades and less noise. It is expected to be used not only in mountainous areas but also in various areas where the average wind speed is low.

There are two types of vertical axis windmills: a lift type that rotates the windmill using lift generated on the blades, and a drag type that rotates the windmill using drag generated on the blades. The latter drag type has the advantage of being highly responsive to wind changes, since the presence or absence of wind and the rotational speed do not depend on the wind direction. For example, Patent Document 1 is known as a wind power generation device including such a drag type vertical axis wind turbine.

The wind power generation device described in Patent Document 1 includes a vertical rotation shaft that transmits rotational force to a wind power generation motor, a plurality of support arms provided radially at equal intervals from the vertical rotation shaft, and a support arm at the tip of each support arm. A wind power generation device having a wind blowing paddle connected thereto, the wind blowing paddle having a concave panel portion formed by concavely curving or bending the outer surface side in a plan view, and a front edge portion of the concave panel portion in a rotating direction. A leading edge airflow storage part is provided which protrudes outward along the side and whose tip is curved or bent toward the rear edge, and extends from the connection part with the support arm of the wind blowing paddle to the rear edge. The length is longer than that of the support arm.

In the wind power generation device described in Patent Document 1, when the concave panel of any wind paddle receives wind from the front, the received wind flows from the rear edge to the front edge along the outer surface of the concave panel. guided to the leading edge airflow reservoir. Since the leading edge airflow storage section catches the flowing wind, a rotational torque is generated around the vertical axis of rotation due to the reaction against this force, and this rotational torque is transmitted to the vertical axis of rotation via the support arm. This causes the vertical rotation axis to rotate in one direction.

Patent No. 5972478

However, in the wind power generation device described in Patent Document 1, when any wind paddle receives wind from the front of the concave panel part and generates rotational torque, the wind after being caught by the leading edge airflow storage part is This becomes an exhaust flow that escapes rearward from the rear edge of the concave panel section. Since this exhaust flow flows in the opposite direction to the rotational direction of the vertical rotation shaft, there is a problem that the rotation of the wind blowing paddle adjacent to the upstream side in the rotational direction of the wind blowing paddle is obstructed by the exhaust flow. In particular, when the number of wind blowing paddles (blade) becomes five or more, the distance between each support arm supporting the wind blowing paddles becomes less than 90 degrees, and as a result, the separation between two wind blowing paddles that are adjacent to each other in the rotation direction increases. As the distance becomes narrower, the influence of the exhaust flow described above increases, causing the problem that the vertical rotation shaft is no longer activated.

The present invention has been made in view of the actual state of the prior art, and an object of the present invention is to provide a wind power generation device that can reliably rotate a vertical rotation axis even with a small amount of wind.

In order to achieve the above object, one aspect of the present invention includes: a vertical rotation axis that transmits rotational force to a power generation motor; a plurality of arms extending radially from the rotation axis at equal intervals; A wind power generation device comprising: a plurality of blades each provided at a tip of an arm; the blades each include a receiving plate having a concavely curved outer surface; and a receiving plate protruding forward in a rotating direction of the receiving plate. The blade has a curved airflow storage portion formed therein, and the height position of the blade is made different between the blades adjacent to each other in the rotation direction.

According to the wind power generation device of the present invention, the vertical rotating shaft can be reliably rotated even with a small amount of wind.

1 is a perspective view of a wind power generation device according to an embodiment of the present invention. FIG. 1 is a partially cutaway front view of the wind power generation device according to the present embodiment. FIG. 1 is a plan view of a wind power generation device according to the present embodiment. FIG. 2 is a cross-sectional view of blades included in the wind power generator according to the present embodiment. It is a perspective view of the blade with which the wind power generation device concerning this embodiment is equipped. FIG. 2 is an explanatory diagram showing the operation of the wind power generator according to the present embodiment.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view of the wind power generation device according to the present embodiment, FIG. 2 is a partially cutaway front view of the wind power generation device according to the present embodiment, and FIG. 3 is a plan view of the wind power generation device according to the present embodiment. 4 are plan views of blades included in the wind power generation device according to this embodiment, and FIG. 5 is a perspective view of blades provided in the wind power generation device according to this embodiment.

As shown in FIGS. 1 and 2, the wind power generation device 1 according to the present embodiment includes a shaft support 2 fixed at a predetermined installation location, and a vertical rotation shaft rotatably supported by the shaft support 2. 3, a plurality of arms 4 provided radially around the vertical rotation axis 3, and a blade 5 provided at the tip of each arm 4.

The shaft support 2 has a cylindrical lower support 2a and a cylindrical upper support 2b continuous above the lower support 2a, and the vertical rotation shaft 3 is mounted on a ball bearing inside the upper support 2b. (not shown), etc. A pair of magnets 6 that keep the vertical rotation shaft 3 in a floating state and a power generation motor 7 that generates power by rotating the vertical rotation shaft 3 are disposed inside the lower support base 2a.

A pair of magnets 6 are arranged with the same polarity facing each other, one of which is fixed to the vertical rotating shaft 3 side, and the other is fixed to the lower support base 2a side. By keeping the vertical rotating shaft 3 in a floating state due to the repulsive force of the pair of magnets 6, the frictional resistance with the shaft support 2 is reduced.

The power generation motor 7 converts the rotational force of the vertical rotating shaft 3 into electric power. In this embodiment, the rotation shaft of the power generation motor 7 is directly connected to the lower end of the vertical rotation shaft 3, but the rotation shaft of the power generation motor 7 is connected to the vertical rotation via a rotation transmission mechanism having a plurality of gears. It may also be connected to the shaft 3.

The vertical rotating shaft 3 is a member that rotates due to the wind force received by the blades 5, and is rotatably supported by the shaft support base 2 in a vertically oriented position.

The arm 4 is a member that transmits the rotational torque generated by the blade 5 to the vertical rotation shaft 3, and extends radially from the vertical rotation shaft 3 at equal intervals in the circumferential direction. In this embodiment, six arms 4 are provided at intervals of 60 degrees in the circumferential direction at two positions separated in the vertical direction of the vertical rotation shaft 3, and one arm is provided with two upper and lower arms 4. The blade 5 is supported.

Among these 12 arms 4 in total, the height positions of the six arms 4 provided on the upper stage side are alternately varied along the circumferential direction, and similarly, the height positions of the six arms 4 provided on the lower stage side are alternately different. The height positions of the arms 4 are also alternately varied along the circumferential direction. As a result, the arm 4 supports a total of six blades 5 such that their height positions alternately vary along the circumferential direction, and among these six blades 5, three blades 5 Every other blade 5 is supported at a high position, and every other blade 5 is supported at a low position. All the blades 5 have the same shape, and as shown in FIG. The relationship between the height difference ΔL between the blades 5 and the height L of the blade 5 is set so that ΔL/L≧1/10. In this embodiment, in contrast to the three blades 5 arranged at every other high position, the remaining three blades 5 are arranged at a lower position by about L/3 (ΔL/3). L≒1/3).

The blade 5 is a member that generates a rotational force on the vertical rotating shaft 3 by the force of the wind. As shown in FIGS. 3 to 5, the blades 5 include a wind receiving panel (receiving plate) 51 that is rectangular in front view with a concavely curved outer surface, and a wind receiving panel (receiving plate) 51 that extends upward and downward along one side edge of this wind receiving panel 51. It has an airflow storage part 52 extending in the direction, an upper prevention plate 53 that blocks the upper end of the wind receiving panel 51, and a lower preventing plate 54 that blocks the lower end of the wind receiving panel 51.

The wind receiving panel 51 is a member that guides the wind received by the concave outer surface 511 to the front end, and is formed so that the inner surface 512 is curved in a convex shape when viewed from above. In this embodiment, the wind receiving panel 51 is formed using an aluminum plate material in order to reduce weight, but any material other than aluminum, such as metal or plastic, may be used as long as it is lightweight and has sufficient strength. A wind receiving panel 51 may also be formed.

The airflow storage portion 52 is a portion that receives wind received by the concave outer surface 511 of the wind receiving panel 51 and converts it into rotational force. In this embodiment, in order to reduce weight, aluminum pipe material is vertically It is used cut in half. The airflow storage section 52 protrudes forward in a curved shape along the longitudinal direction of the front edge in the rotating direction of the wind receiving panel 51, and a part of the airflow storage section 52 surrounds the front end of the wind receiving panel 51. and faces the inner surface 512. By closing the gap created between these airflow storage portions 52 and the inner side surface 512 of the wind receiving panel 51 with the partition plate 521, the inner side is formed between the front edge of the wind receiving panel 51 and the airflow storage portion 52. A step portion 55 that bulges out to the side is formed.

The upper prevention plate 53 is a member for preventing the wind received on the outer surface 511 of the wind receiving panel 51 from escaping upward, and the lower prevention plate 54 prevents the wind received on the outer surface 511 of the wind receiving panel 51 from escaping upward. This is a member to prevent the water from escaping downward.

A bracket 8 is fixed to the convex inner surface 512 of the wind receiving panel 51, and the tip of the arm 4 is fixed to the bracket 8 with a first bolt 9 and a second bolt 10. The wind receiving panel 51 is supported by the arm 4 with the first bolt 9 as a rotational fulcrum, and the bracket 8 is formed with a long hole 11 extending in an arc shape around the first bolt 9. The second bolt 10 is inserted into the elongated hole 11 and fixes the arm 4 and the bracket 8. Therefore, by adjusting the mounting angle of the wind receiving panel 51 with respect to the arm 4 with the first bolt 9 loosened, and after such adjustment, tightening the first bolt 9 and the second bolt 10 inserted through the elongated hole 11, The angle of the wind receiving panel 51 with respect to the rotation direction in plan view can be adjusted as appropriate.

As shown in FIG. 3, the tip of the arm 4 is connected to the center of the entire length (P1) of the blade 5 in the rotating direction, and the distance from the connection part with the arm 4 to the rear end of the blade 5 and the front end The distance to the center is set to be approximately the same. Further, the length of the arm 4 is set to be longer than the separation distance (P2) between two adjacent blades 5 in the rotation direction, and in this embodiment, the length of the arm 4 is set to be the total length of the blades 5. (P1), and the length of one blade 5 (P1) is approximately the same as the distance between two adjacent blades 5 (P2).

Next, the operation of the wind power generation device 1 according to the present embodiment will be explained mainly with reference to FIG. 6.

As shown in FIG. 6, when the wind is blowing upward from the bottom of the figure, the blade 5 located furthest upwind absorbs the wind with the concave outer surface 511 of the wind receiving panel 51 that directly faces the wind. receive. Hereinafter, the blade 5 will be described with reference numeral 5A, and the blades 5 located counterclockwise from the blade 5A will be designated with numerals 5B, 5C, 5D, 5E, and 5F in order.

In the wind receiving panel 51 of the blade 5A, the outer surface 511 that receives the wind is curved in a concave shape and slopes toward the front end, so that the received wind is directed to the airflow from the trailing edge side to the leading edge side along the outer surface 511. It is guided to the storage section 52. The airflow storage section 52 receives the wind guided by the outer surface 511 of the wind receiving panel 51, and generates a counterclockwise rotational torque about the vertical rotation axis 3 as a reaction to the force. At this time, a step portion 55 that bulges inward is formed between the front edge of the wind receiving panel 51 and the airflow storage portion 52, so that the wind guided to the airflow storage portion 52 flows through the step portion 55. Since the air is stirred and becomes a turbulent flow, the wind received by the outer surface 511 of the wind receiving panel 51 generates a large rotational torque that pushes the blade 5A toward the leading edge. This rotation torque is transmitted to the vertical rotation shaft 3 via the arm 4, and becomes a force that rotates the vertical rotation shaft 3 counterclockwise in FIG. 6.

The blade 5B, which is disposed on the downstream side in the rotational direction with respect to the blade 5A, has the front edge side of the wind receiving panel 51 inclined outward with respect to the wind direction, so that the outer surface of the wind receiving panel 51 511 receives the wind in an inclined position and guides the received wind to the airflow storage section 52 on the leading edge side. At this time, the amount of air received by the wind receiving panel 51 is smaller than the amount of air received by the wind receiving panel 51 of the blade 5A directly facing the wind. Generates a counterclockwise rotating torque around the center.

The blade 5C disposed on the downstream side in the rotational direction with respect to the blade 5B receives wind on the convex inner surface 512 of the wind receiving panel 51, but the front edge side of the wind receiving panel 51 is turned inward with respect to the wind direction. Because it is tilted, it creates a force pushing it in the direction of the wind. Thereby, the blade 5C rotates the vertical rotation shaft 3 counterclockwise in FIG. 6 due to the force pushed by the wind.

The blade 5D, which is arranged on the downstream side in the rotational direction with respect to the blade 5C, is the blade located on the most leeward side, and the inner surface 512 of the wind receiving panel 51 receives the wind from the front. This wind flows along the convex inner surface 512 of the wind receiving panel 51, but since the rear edge side of the inner surface 512 is inclined outward with respect to the wind direction, it flows along the inner surface 512. The flowing air current acts as a force that pushes the blade 5D forward.

The blade 5E, which is arranged on the downstream side in the rotational direction with respect to the blade 5D, receives the wind on the convex inner surface 512 of the wind receiving panel 51, but the leading edge side of the wind receiving panel 51 is turned outward with respect to the wind direction. Since it is in an inclined state, a rotational force is generated in the opposite direction (clockwise) to the rotation direction. However, since the blade 5F is located upwind of the blade 5E, and the wind received by the blade 5E is blocked by the blade 5F, the rotational force in the opposite direction (clockwise) generated by the blade 5D is small. .

The blade 5F arranged on the downstream side in the rotational direction with respect to the blade 5E is a blade adjacent to the upstream side in the rotational direction with respect to the blade 5A. Since the front edge side of the wind receiving panel 51 is inclined inward with respect to the wind direction, the blade 5F receives wind from the outer surface 511 of the wind receiving panel 51 and the airflow storage portion 52, and rotates. Generates a rotational force in the opposite direction. However, since the outer surface 511 that receives the wind and the airflow storage section 52 have a smooth curved shape with respect to the flow, the wind flows along the outer surface 511 and the airflow storage section 52 in the opposite direction to the rotation direction. It weakens the rotational force generated.

In this way, when the six blades 5A to 5F arranged at equal intervals around the vertical rotation axis 3 receive wind from one direction, the blades 5A to 5D turn the force of the wind received from one direction forward. It can be a force that rotates it toward the edge. In addition, although the blades 5E and 5F receive a force that causes them to rotate in the opposite direction to the rotation direction, this force is sufficiently smaller than the rotational force in the rotation direction caused by the other four blades 5A to 5F. The vertical rotation shaft 3 can be rotated counterclockwise in FIG. 6 via the arm 4 that supports the blades 5A to 5F.

At this time, in the blade 5A located on the windward side and directly facing the wind, the outer surface 511 of the wind receiving panel 51 receives the wind from the front, so the airflow storage part 52 receives the strong wind, and the force is A large rotational torque can be generated by the reaction. However, as shown by the white arrow Z in FIG. Since the exhaust flow is in the opposite direction to the rotational direction, the rotation of the blade 5F adjacent to the blade 5A on the upstream side in the rotational direction is influenced by the exhaust flow Z. Note that such an exhaust flow Z also occurs in the blade 5B adjacent to the blade 5A on the downstream side in the rotational direction, but the amount of air flowing into the outer surface 511 of the blade 5B is considerably smaller than that of the blade 5A. Therefore, the size of the exhaust flow Z discharged rearward from the blade 5B becomes small.

Therefore, in the wind power generation device 1 according to the present embodiment, the height positions of the six blades 5A to 5F are arranged so as to be alternately different along the circumferential direction, so that the exhaust flow Z has no influence on the rotation. We are trying to reduce it. For example, in the positional relationship of the blades 5A to 5F shown in FIG. If the blade 5F is placed at a low position, the top surface of the blade 5F is lower than the top surface of the blade 5A, so the exhaust flow Z discharged backward from the blade 5A at a position higher than the blade 5F is the airflow of the blade 5F. It will pass above the blade 5F without hitting the reservoir 52. Therefore, it is possible to reduce the exhaust flow Z from interfering with the rotation of the blade 5F. When the blade 5F moves to the position of the blade 5A as the vertical rotation shaft 3 rotates, the upper surface of the blade 5E is now higher than the upper surface of the blade 5F, resulting in a lower position than the blade 5E. At this point, the exhaust flow Z discharged rearward from the blade 5F passes below and above the blade 5E. Similarly, when any of the blades 5A to 5F is moved to the windward side, the blades 5 adjacent to each other in the rotation direction have a positional relationship with a difference in height, so that the influence of the exhaust flow Z can be reduced. can.

Note that if the height difference between the blades 5 adjacent to each other in the rotation direction is too small, the above-mentioned effects cannot be fully exhibited. It is preferable that the relationship of ΔL is set in the range of ΔL/L≧1/10. However, if the height difference ΔL between adjacent blades 5 in the rotation direction is too large, the wind power generation device 1 will become larger in the vertical direction. Preferably, in this embodiment, the remaining three blades 5 are placed at a position approximately L/3 lower than the three blades 5 placed at a high position.

As explained above, the wind power generation device 1 according to the present embodiment includes a vertical rotation shaft 3 that transmits rotational force to the power generation motor 7, and a plurality of arms 4 that extend radially from the vertical rotation shaft 3 at equal intervals. , a plurality of blades 5 provided at the tip of each arm 4, and these blades 5 form a wind receiving panel (receiving plate) 51 whose outer surface is curved concavely, and a rotation direction of the wind receiving panel 51. Since the blades 5 adjacent to each other in the rotational direction have different height positions, the exhaust air is discharged rearward from any blade 5. The influence of the flow Z on the rotation of the blades adjacent to the upstream side in the rotation direction can be reduced, and the vertical rotation shaft can be smoothly rotated.

In addition, a stepped portion 55 that bulges inward is formed between the front edge of the wind receiving panel 51 and the airflow storage portion 52, and air flows from the rear edge side along the outer surface 511 of the wind receiving panel 51. Since the wind guided to the storage portion 52 becomes turbulent due to the stepped portion 55, a large rotational torque that pushes the blade 5 toward the leading edge can be generated.

Further, in the wind power generation device 1 according to the present embodiment, six blades 5 are arranged at regular intervals, and the distance from the connection part of the blade 5 with the arm 4 to the rear end and the distance to the front end are are set to be equal, and the length of the arm 4 is set to be longer than the distance between two adjacent blades 5 in the rotation direction. As a result, it is possible to obtain a large rotational torque that activates the vertical rotation shaft 3, and all six blades 5 efficiently catch wind from one direction, ensuring that the vertical rotation shaft can be moved even with a small amount of wind. It can be rotated.

Here, the number of blades 5 is not necessarily limited to six, but if the number of blades 5 is an even number, all the blades 5 are arranged with height differences every other blade in the rotation direction, and the vertical rotation axis 3 This is preferable because the blades 5 facing each other with the gap in between are at the same height position. Furthermore, when the number of blades 5 increases, the distance between two blades 5 adjacent to each other in the rotation direction becomes narrower, and there is a risk that the wind directed toward the blades 5 in the leeward position may be blocked. It is most preferable to arrange six blades 5 at equal intervals.

Note that the present invention is not limited to the above-described embodiments, and can be modified in various ways without departing from the gist of the present invention, and all technical matters included in the technical idea described in the claims are included in the present invention. Subject to invention. Although the embodiments described above are preferred examples, those skilled in the art can realize various alternatives, modifications, variations, or improvements based on the content disclosed in this specification. These are within the scope of the appended claims.

1 Wind power generation device 2 Shaft support 3 Vertical rotation axis 4 Arm 5 Blade 6 Magnet 7 Power generation motor 8 Bracket 9 First bolt 10 Second bolt 11 Long hole 51 Wind receiving panel 52 Airflow storage section 53 Upper prevention plate 54 Lower side Prevention plate 55 Step portion 511 Outer surface 512 Inner surface Z Exhaust flow

Claims (6)

A vertical rotating shaft that transmits rotational force to a power generation motor, a plurality of arms extending radially from the rotating shaft at equal intervals, and a plurality of blades provided at the tips of the plurality of arms, respectively. A wind power generation device,
The blade has a receiving plate whose outer surface is curved in a concave shape, and a curved airflow storage portion formed to protrude forward in the rotating direction of the receiving plate,
The height positions of the blades are made different between adjacent blades in the rotational direction.
A wind power generation device characterized by: In the description of claim 1, the plurality of blades are all set to the same height dimension, and the length dimension of the blade along the axial direction of the rotation shaft is L, and the height difference between the blades adjacent to each other in the rotation direction is L. A wind power generation device characterized in that the relationship between L and ΔL is set to ΔL/L≧1/10, where ΔL is ΔL. 2. The wind power generator according to claim 1, wherein a stepped portion that bulges inward is formed between the receiving plate of the blade and the airflow storage portion. The wind power generation device according to claim 1, wherein the blades facing each other via the rotating shaft are set at the same height position. 2. The wind power generation device according to claim 1, wherein a tip end of the arm is connected to a central portion of the entire length of the blade in a rotating direction. The wind power generation according to claim 5, wherein the number of the plurality of blades is six, and the length of the arm is set longer than the distance between adjacent blades in the rotation direction. Device.

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