Vertical axis windmill structure with wind increasing mechanism

Abstract

To provide a vertical axis windmill structure with a wind increasing mechanism capable of improving power generation capacity.SOLUTION: An amount of wind colliding with a vertical axis windmill 14 can be increased by taking a larger amount of wind into a wind increase mechanism 15, so as to improve original power generation capacity of the vertical axis windmill 14. A pair of right and left rudder plates 22, 23 are mounted to a lower face part 20 of the wind increase mechanism 15, so that a front end 17 of the wind increase mechanism 15 is always opposed to a wind direction, so as to reliably take wind W into the wind increase mechanism 15. Rear end sides of the rudder plates 22, 23 are inclined outward in a horizontal direction. Therefore, while the rudder plates 22, 23 are straight-faced to the wind direction, the right and left rudder plates 22, 23 always receive pressure of the wind W and can maintain a stable posture. The rudder plates 22, 23 are positioned in a free space S2 in an outer frame body 1, so as to maintain such an advantage that the plural vertical axis windmills 14 are stacked on each other per outer frame body 1.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to a vertical axis wind turbine structure with a wind booster mechanism. [Background technology]

[0002] One type of wind turbine for wind power generation is the vertical axis wind turbine, which has multiple lift blades attached to a vertical rotating shaft. There are two types of vertical axis wind turbines: a one-sided support type, in which only the lower end of the vertical rotating shaft is rotatably supported, and a two-sided support type, in which the vertical rotating shaft is housed in an internal space of a ventilated frame structure and both the upper and lower ends of the vertical rotating shaft are rotatably supported by the frame structure. The two-sided support type has higher support rigidity for the vertical axis wind turbine, and multiple types can be stacked vertically together with the frame structure if necessary (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2023-41596 A Summary of the Invention [Problem to be solved by the invention]

[0004] As described above, double-sided support type vertical axis wind turbines have advantages such as high support rigidity and the ability to be stacked in multiple tiers. However, vertical axis wind turbines generate rotational torque only in the specific angle range where the wind first hits them, and have lower power generation capacity than propeller-type horizontal axis wind turbines, which generate rotational torque over the entire 360-degree angle range. Improvements in this area were desired.

[0005] The present invention has been made in consideration of the above-mentioned conventional circumstances, and has an object to provide a vertical axis wind turbine structure with a wind boosting mechanism that can improve power generation capacity. [Means for solving the problem]

[0006] According to a first technical aspect of the present invention, there is provided a vertical axis wind turbine structure with a wind boosting mechanism, comprising: an outer frame body whose sides are formed only by a plurality of supports to allow ventilation from all directions and having support parts near the centers of the upper and lower faces; a vertical axis wind turbine having a plurality of lift blades attached by a horizontal frame extending in a radial direction around a vertical axis whose upper and lower ends are rotatably supported on the support parts of the outer frame body; and a wind boosting mechanism which is roughly a square tube shape penetrating horizontally, rotatable about the vertical axis axis when receiving wind force so that its front end always faces the wind direction and houses the vertical axis wind turbine inside, the wind boosting mechanism having a vertical width smaller than the internal space of the outer frame body, and by housing the wind boosting mechanism within the internal space of the outer frame body, an empty space is formed above or below the wind boosting mechanism, and at least a pair of rudder plates which protrude rearward from the rear end of the wind boosting mechanism with a vertical width slightly smaller than the empty space and whose rear end portions are inclined outwardly to the left and right are attached to the upper or lower surface part of the wind boosting mechanism in a state where their width direction is aligned vertically.

[0007] According to a second technical aspect of the present invention, the side portions of the air-increasing mechanism have a narrow gap between their front ends on the side where the air flows in and a wide gap between their rear ends on the side where the air flows out, and each rear end has a flange bent outwardly to the left and right, and the upper and lower portions have a circular opening through which a vertical rotation shaft passes, and the opening is supported so as to be freely rotatable relative to a support portion of the outer frame body.

[0008] According to a third technical aspect of the present invention, the front end of the side portion of the air-increasing mechanism is slightly open outward to the left and right. Effect of the Invention

[0009] According to the first technical aspect of the present invention, a larger amount of wind is drawn into the wind-increasing mechanism, increasing the amount of wind striking the vertical axis wind turbine, and the vertical axis wind turbine in the wind-increasing mechanism can be rotated at a higher speed, thereby improving the inherent power generation capacity of the vertical axis wind turbine.

[0010] In addition, since a pair of left and right rudder blades are attached to the upper or lower surface of the wind-boosting mechanism, the wind-boosting mechanism rotates in conjunction with the wind direction, and the front end is always facing the wind direction, so that the wind can be reliably taken into the wind-boosting mechanism. Since the rear end of this rudder blade is inclined outward to the left and right, even if the rudder blade is facing straight against the wind direction, the left and right rudder blades are always subjected to wind pressure and can maintain their posture in a stable state.

[0011] Furthermore, since the rudder blade is located within the free space within the outer frame, the advantage of being able to stack a number of vertical axis wind turbines together with their outer frames is maintained.

[0012] According to the second technical aspect of the present invention, the wind passing inside the wind-increasing mechanism is two-dimensionally drawn in behind the side part, and the wind passing outside the side part also collides with the flange and is drawn in while being diffused two-dimensionally behind the side part. Therefore, a low pressure part is formed behind the vertical axis wind turbine, and a large amount of wind is drawn in from the front end of the wind-increasing mechanism into the wind-increasing mechanism, making it possible to rotate the vertical axis wind turbine at a higher speed and improving the power generation capacity of the vertical axis wind turbine.

[0013] In addition, since the air-boosting mechanism is supported rotatably relative to the support part of the outer frame body rather than on the vertical rotation shaft, the load of the air-boosting mechanism is not applied to the vertical rotation shaft, which suppresses wear on the rotating part of the vertical rotation shaft and improves the support rigidity of the air-boosting mechanism.

[0014] According to the third technical aspect of the present invention, the front end of the side portion is slightly open outward, so that a large amount of wind can be drawn into the wind-boosting mechanism, allowing the vertical axis wind turbine to rotate at even higher speed. [Brief description of the drawings]

[0015] [Figure 1] FIG. 1 is an overall perspective view showing a vertical axis wind turbine structure with a wind boosting mechanism. [Diagram 2] FIG. 2 is a perspective view of the wind-increasing mechanism housing the vertical axis wind turbine, seen obliquely from above. [Diagram 3] FIG. 2 is a perspective view of the wind-boosting mechanism housing the vertical axis wind turbine, viewed obliquely from below. [Figure 4] Cross-sectional view taken along the line SA-SA in Figure 1. [Diagram 5] FIG. [Figure 6] A bottom view equivalent to Figure 5, showing the state in which the fan rotates in response to changes in wind direction. [Figure 7] FIG. 4 is an explanatory diagram showing an air flow in the air-increasing mechanism. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] 1 to 7 are diagrams showing a preferred embodiment of the present invention.

[0017] The wind turbine structure according to this embodiment has an outer frame 1. The outer frame 1 is a rectangular parallelepiped with each side formed by a metal frame as a whole, and the side surfaces are formed only by four support columns 2. Therefore, this outer frame 1 allows ventilation from all directions except the bottom. Small rectangular support parts 3 are formed in the center at the top and bottom of the outer frame 1. A circular hole 4 is formed in the center of the upper support part 3.

[0018] Bearing fixing parts 5, 6, which penetrate the center, are attached integrally to the upper and lower support parts 3 of the outer frame 1 by welding. The upper and lower ends of a vertical rotating shaft 7 are inserted into the central penetration part of these bearing fixing parts 5, 6, and the vertical rotating shaft 7 is supported for free rotation by bearings. A pulley 11 is fixed to the lower end of the vertical rotating shaft 7 in the central penetration part of the lower bearing fixing part 6. A timing belt (not shown) is hung on this pulley 11, so that the rotational force of the vertical rotating shaft 7 can be transmitted to a generator to generate electricity.

[0019] Lift blades 13 are attached to the vertical rotation shaft 7 by four horizontal frames 12. The vertical rotation shaft 7, horizontal frames 12 and lift blades 13 constitute a vertical axis wind turbine 14. The lift blades 13 are of a straight blade type, and when they receive wind W, lift is generated on the lift blades 13, and the rotational component of this lift causes the vertical axis wind turbine 14 to rotate in the rotational direction R (see Figure 7).

[0020] In this embodiment, the vertical axis wind turbine 14 is housed inside the wind-boosting mechanism 15 to improve rotational force. The wind-boosting mechanism 15 is roughly a rectangular cylinder that penetrates horizontally, and the vertical width h of the wind-boosting mechanism 15 is smaller than the vertical width H of the internal space S of the outer frame body 1. Therefore, empty spaces S1, S2 are defined inside the outer frame body 1 above and below the wind-boosting mechanism 15. The wind-boosting mechanism 15 is formed so that the gap between the front ends 17 on the side where wind W flows in is narrow, and the gap between the rear ends on the side where wind flows out is wide. The front ends 17 of the side portions 16 are slightly open outward to the left and right, and the rear ends are formed with flanges 18 that are bent outward to the left and right.

[0021] The upper surface 19 and the lower surface 20 are each horizontal and have a circular opening 21 through which the vertical rotation shaft 7 passes. The opening 21 is supported rotatably on the outside of the bearing fixing parts 5 and 6 of the support part 3 of the outer frame 1 via bearings.

[0022] Of the empty spaces S1 and S2 above and below the outer frame 1, the lower empty space S2 is larger. The lower surface portion 20 of the air-boosting mechanism 15 is provided with rudder blades 22 and 23 having a vertical width slightly smaller than the empty space S2.

[0023] The rudder blades 22, 23 are long plates with a certain thickness, and two of them are attached vertically, with their width direction aligned vertically, at symmetrical positions on the left and right of the wind-boosting mechanism 15. The front parts of the rudder blades 22, 23 are fixed to the lower surface part 20 in a straight state along the left and right center line X of the wind-boosting mechanism 15, and their rear parts protrude rearward from the rear end of the wind-boosting mechanism 15 while inclining outward to the left and right, respectively.

[0024] The amount of protrusion of the rudder blades 22, 23 to the rear is set to a length that fits inside the inscribed circle E inscribed in the four struts 2 of the outer frame body 1, and by fitting inside this inscribed circle E, the wind booster mechanism 15 can rotate 360 ​​degrees around the vertical rotation axis 7 in the internal space S of the outer frame body 1. Of the two rudder blades 22, 23 on the left and right, the outer rudder blades 23 on the left and right are shorter in length than the inner rudder blades 22 on the left and right so that they are located inside the inscribed circle E.

[0025] When the wind W hits the rudder blades 22, 23, the front end 17 of the wind-boosting mechanism 15 always faces straight against the direction of the wind W. Even if the direction of the wind W changes, the wind-boosting mechanism 15 rotates as a whole accordingly, so that the front end 17 always faces straight against the direction of the wind W (see Fig. 6). Then, the wind W is drawn into the wind-boosting mechanism 15 from between the front ends 17. In particular, since the rear parts of the rudder blades 22, 23 are inclined outward to the left and right, even if the rudder blades 22, 23 face straight against the wind W, the left and right rudder blades 22, 23 are always subjected to the pressure of the wind W and can maintain their posture in a stable state.

[0026] The wind W1 introduced into the wind-increasing mechanism 15 hits the lift blades 13 of the vertical axis wind turbine 14 as it passes inside the wind-increasing mechanism 15, causing the vertical axis wind turbine 14 to rotate in a predetermined rotation direction R. After rotating the vertical axis wind turbine 14 inside the wind-increasing mechanism 15, the wind W1 is two-dimensionally drawn in behind the wind-increasing mechanism 15.

[0027] Moreover, the wind W2 that is not introduced inside the wind-increasing mechanism 15 and passes outside the side portion 16 collides with the flange 18 and is drawn in while being diffused two-dimensionally toward the rear of the side portion 16. In this way, a very strong vortex is formed behind the wind-increasing mechanism 15 by drawing in both the inside and outside winds W1 and W2, which forms a low pressure area L behind the vertical axis wind turbine 14.

[0028] This low pressure section L allows a large amount of wind W1 to be drawn into the vertical axis wind turbine 14 from the front end 17 of the wind-increasing mechanism 15 to rotate, so the vertical axis wind turbine 14 rotates at a higher speed, improving the inherent power generation capacity of the vertical axis wind turbine 14. Because the front end 17 of the wind-increasing mechanism 15 opens slightly outward, even more wind W is drawn into the wind-increasing mechanism 15, allowing the vertical axis wind turbine 14 to rotate with even greater vigor.

[0029] The wind-increasing mechanism 15 rotates concentrically with the vertical axis wind turbine 14 depending on the direction of the wind W. However, since the wind-increasing mechanism 15 is supported for free rotation not relative to the vertical rotation shaft 7 but relative to the bearing fixing parts 5, 6 of the outer frame body 1, the load of the wind-increasing mechanism 15 is not applied to the vertical rotation shaft 7, which suppresses wear on the rotating part of the vertical rotation shaft 7 and improves the supporting rigidity of the wind-increasing mechanism 15.

[0030] Since the rudder blades 22, 23 that control the direction of the wind-increasing mechanism 15 are located in the empty space S2 inside the outer frame 1, multiple vertical axis wind turbines 14 can be stacked on top of each other together with the outer frame 1. By doing so, the amount of power generation within a limited area can be increased by the number of turbines stacked. [Explanation of symbols]

[0031] 1 Outer frame 2 pillars 3 Support part 7 Vertical Rotation Axis 12 Horizontal Frame 13 Lifting Blade 14 Vertical axis wind turbine 15 Wind increase mechanism 16 Side part 17 Front end 18 Flange 21 Opening 22, 23 Rudder plate H Vertical width of the internal space h Vertical width of the air boost mechanism R Rotation direction L Low pressure section S interior space S1, S2 Free space W Wind W1 Inner Wind W2 Outside Wind

Claims

1. A vertical axis wind turbine structure with a wind boosting mechanism, comprising: an outer frame body having a structure in which the sides are formed only by a number of supports to allow ventilation from all directions and having support parts near the centers of the top and bottom faces; a vertical axis wind turbine having a vertical rotation shaft whose upper and lower ends are rotatably supported by the support parts of the outer frame body and having a number of lift blades attached by horizontal frames extending in radial directions around the vertical rotation shaft; and a wind boosting mechanism which is a roughly rectangular cylindrical shape penetrating horizontally, rotatable around the vertical rotation shaft when subjected to wind force so that its front end always faces the wind direction and houses the vertical axis wind turbine therein, The vertical width of the air boosting mechanism is smaller than the internal space of the outer frame body, and by storing the air boosting mechanism in the internal space of the outer frame body, an empty space is formed above or below the air boosting mechanism; A vertical axis wind turbine structure with a wind-boosting mechanism, characterized in that at least a pair of rudder blades are attached to an upper or lower surface of the wind-boosting mechanism with a vertical width slightly smaller than a free space, protruding rearward from a rear end of the wind-boosting mechanism and having rear end portions inclined outwardly to the left and right at symmetrical positions on the left and right of the wind-boosting mechanism, with their width directions aligned vertically.

2. The side portions of the air boosting mechanism have a narrow gap between the front ends on the side where the air flows in and a wide gap between the rear ends on the side where the air flows out, and flanges are formed at the rear ends that are bent outwardly to the left and right, 2. The vertical axis wind turbine structure with a wind boosting mechanism according to claim 1, wherein a circular opening through which the vertical rotation shaft passes is formed in the upper surface portion and the lower surface portion, and the opening is rotatably supported by a support portion of the outer frame body.

3. 3. The vertical axis wind turbine structure with a wind boosting mechanism according to claim 1, wherein the front end of the side surface of the wind boosting mechanism is slightly open to the left and right outside.

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