Vertical axis wind turbines and wind power generators using these turbines

Abstract

To provide a hybrid vertical wind turbine capable of realizing the efficiency of a lift type wind turbine at high wind speeds while ensuring the starting performance of a drag type wind turbine at low wind speeds. [Solution] A blade 120 is supported by a main arm 112 extending radially outward from a main shaft 110 so as to be rotatable around a pitch axis parallel to the main shaft 110. In addition to the main arm 112, an auxiliary arm 114 is provided which is installed to connect the main shaft 110 and the blade 120 and regulates the rotation angle (pitch angle) of the blade 120. When the wind speed is below a predetermined value, the auxiliary arm 114 is installed on the blade 120 so that a position horizontally offset from the main shaft 114 depending on the wind direction becomes the center of rotation β. The auxiliary arm 114 is provided with an offset cancellation mechanism which cancels the offset when the wind speed reaches or exceeds a predetermined value.

Description

[Technical field]

[0001] The present invention relates to a wind turbine, and more particularly to a vertical axis wind turbine in which the main shaft is arranged vertically. [Background technology]

[0002] There are two types of vertical axis wind turbines: lift type wind turbines, which obtain rotational force by utilizing the lift force acting on the blades, and drag type wind turbines, which obtain rotational force by utilizing the drag force acting on the blades (see Non-Patent Document 1). There are various types of lift type wind turbines and drag type wind turbines, and an example of a lift type wind turbine is shown in Figure 9, and an example of a drag type wind turbine is shown in Figure 10. In both Figures 9 and 10, (a) is a plan view, and (b) is a perspective view.

[0003] The lift-type wind turbine shown in Fig. 9 is equipped with a main shaft 10 that is installed vertically and four blades 20 that revolve around the main shaft 10. The blades 20 are fixedly supported by main arms 12 that extend radially outward from the main shaft 10.

[0004] The drag-type wind turbine shown in FIG. 10 includes a main shaft 10 that is installed vertically and four blades 20 that revolve around the main shaft 10. The blades 20 are supported by a main arm 12 that extends radially outward from the main shaft 10 so as to be rotatable about a pitch axis (the axis on which the blades rotate via the main arm-blade joint 70 in FIG. 10) that is parallel to the main shaft 10. In addition to the main arm 12, an auxiliary arm 14 is provided that is installed to connect the tip end of the main shaft 10 and the blade 20 and regulates the rotation angle (pitch angle) of the blade 20. This auxiliary arm 14 is installed on the blade so that a position β that is offset horizontally from the main shaft 10 becomes the center of rotation. The offset direction is configured to change according to the direction of the wind that the weather vane 30 receives, as the extension direction of the offset plate 40 changes. [Prior art documents] [Non-patent literature]

[0005] [Non-Patent Document 1] "There are two types of vertical axis wind turbines: drag type and lift type." https: / / www2s.biglobe.ne.jp / ~wesra / vawt / vawt.html Summary of the Invention [Problem to be solved by the invention]

[0006] Lift-type wind turbines are known to be very efficient when wind speeds above a certain level can be expected, but they have the problem of being difficult to start up after being stopped, and in many cases require a separate power source to start them up.

[0007] On the other hand, drag-type wind turbines have the advantage of being easy to start even at low wind speeds, but as the rotational speed increases, their rotational efficiency (rotational efficiency relative to wind speed) reaches a plateau at an early stage, meaning that they cannot be as efficient as lift-type wind turbines.

[0008] Therefore, an object of the present invention is to provide a hybrid vertical wind turbine that can ensure the starting performance of a drag type wind turbine at low wind speeds while realizing the efficiency of a lift type wind turbine at high wind speeds, and a wind power generator using the same. [Means for solving the problem]

[0009] In order to solve the above problems, the present invention provides a vertical wind turbine having a main shaft that is installed vertically and a number of blades that revolve around the main shaft, the blades being supported by main arms that extend radially outward from the main shaft so as to be rotatable around a pitch axis that is parallel to the main shaft, and an auxiliary arm that is separate from the main arm and is installed to connect the main shaft and the blades (through an offset cancellation mechanism that will be described later) and regulate the rotation angle (pitch angle) of the blades, the auxiliary arm being installed on the blades so that a position that is horizontally offset from the main shaft depending on the wind direction becomes the center of rotation when the wind speed is equal to or lower than a predetermined value, and an offset cancellation mechanism that cancels the offset when the wind speed becomes equal to or higher than the predetermined value.

[0010] This configuration makes it possible to provide a hybrid vertical wind turbine that can ensure the starting performance of a drag type wind turbine at low wind speeds while realizing the high efficiency of a lift type wind turbine at high wind speeds. That is, when the wind speed exceeds a certain level, the offset cancellation mechanism is activated, the rotation center of the auxiliary arm coincides with the axis of the main shaft, and the rotation angles (pitch angles) of all the blades become the same. That is, when the wind speed exceeds a certain level, the type automatically changes from drag type to lift type, eliminating the disadvantages of both the drag type and lift type.

[0011] The offset cancellation mechanism further comprises a slant shaft extending obliquely upward from the offset position toward the axis of the main shaft, a disk body that moves along the slant shaft, and a rotating frame that is rotatably supported by the disk body, the auxiliary arm is supported by the rotating frame, and has an upward movement mechanism that moves the disk body upward along the slant shaft.

[0012] This configuration allows the wing's rotation angle (pitch angle) to change from drag type to lift type. In other words, by using the slant shaft to move the disk diagonally upward, the center of rotation of the auxiliary arm, which was originally offset, is made to coincide with the axis of the main shaft. Because the offset is cancelled out by this unconventional simple mechanism, no complex configuration or large power is required, and it is possible to make the device extremely lightweight.

[0013] In addition, when the action of the upward movement mechanism is removed, the disk body is returned downward along the slant shaft by its own weight.

[0014] With this configuration, the change from lift type to drag type when the wind weakens is achieved only by its own weight (the weight of the disk body and the members supported by the disk body or the members supported by the disk body), eliminating the need for control or a mechanism to return the disk body downward, and allowing the entire structure to be constructed with a lightweight feel.

[0015] The upward movement mechanism has an orbital which revolves around the main shaft together with the wing, and is characterized in that it moves the disk body upward by utilizing the centrifugal force acting on the orbital.

[0016] With this configuration, it is possible to lift the disk body using only the rotation of the windmill without obtaining power from an external source, i.e., to cancel the offset of the auxiliary shaft rotation center.

[0017] The upward movement mechanism may utilize power of a servo motor to move the disk upward along the slant shaft.

[0018] The offset cancellation mechanism according to the present invention is realized by a very simple and lightweight structure that uses a slant shaft to move the disk body diagonally up and down, so that even if the disk body is moved by a servo motor, it is easy to control and can be realized with small power. In other words, the extent to which the power consumption of the servo motor cancels out the actual amount of power generation (when generating power using the wind turbine) can be kept low.

[0019] The upward movement mechanism is further equipped with a limiting mechanism that limits the upward movement of the disk body to an upper limit height, and the limiting mechanism is released only when the wind speed exceeds a specified value, causing the disk body to rise above the upper limit, thereby offsetting the center of rotation of the auxiliary arm in the opposite direction to the offset position, thereby changing the rotation angle (pitch angle) of the blades and stalling the revolution of the blades.

[0020] With this configuration, it is possible to prevent damage due to excessive rotation speed, etc. Furthermore, the limiting mechanism is realized by directly utilizing the slant shaft that constitutes the offset cancellation mechanism, which has the great advantage that there is little additional mechanism required to realize the limiting mechanism and light weight is not sacrificed.

[0021] The present invention can also be understood as a wind power generator including a generator that generates electricity by rotation of the main shaft of the vertical wind turbine described above. Effect of the Invention

[0022] By applying the present invention, it is possible to realize a lightweight and compact hybrid vertical wind turbine that can achieve the efficiency of a lift type wind turbine at high wind speeds while ensuring the starting performance of a drag type wind turbine at low wind speeds, and to provide a wind power generator utilizing this. [Brief description of the drawings]

[0023] [Figure 1] FIG. 1 is a perspective view of a vertical wind turbine according to an embodiment of the present invention (with some parts omitted), showing a state before an offset cancellation mechanism is activated. [Diagram 2] FIG. 2 is a perspective view of a vertical wind turbine according to an embodiment of the present invention (with some parts omitted), showing a state after an offset cancellation mechanism has been activated. [Diagram 3] FIG. 1 is a perspective view showing the concept of an offset cancellation mechanism (with some parts omitted). [Figure 4] 1A and 1B are partial cross-sectional views (with some parts omitted) illustrating the concept of an offset cancellation mechanism, in which (a) illustrates a state before the offset cancellation mechanism is activated, and (b) illustrates a state after the offset cancellation mechanism is activated. [Diagram 5] FIG. 2 is a perspective view showing a first embodiment of an upward movement mechanism (with some parts omitted). [Figure 6]FIG. 13 is a perspective view showing a second embodiment of the upward movement mechanism (with some parts omitted). [Figure 7] 1A is a diagram showing an example of a limiting mechanism and its operation, in which (a) is a diagram showing a state before the offset cancellation mechanism is activated and the limiting mechanism is not activated, (b) is a diagram showing a state after the offset cancellation mechanism is activated and the limiting mechanism is activated, and (c) is a diagram showing a state in which the limiting mechanism is released. [Figure 8] These are simplified diagrams showing the movement of the disk body due to the operation of the limiting mechanism and the state of the wing at that time, where (a) is a plan view of the state before the offset cancellation mechanism is activated and the limiting mechanism is not activated, (b) is an oblique view of the same, (c) is a plan view of the state after the offset cancellation mechanism is activated and the limiting mechanism is also activated, (d) is an oblique view of the same, (e) is a plan view of the state when the limiting mechanism has been released, and (f) is an oblique view of the same. [Figure 9] FIG. 1 is a schematic diagram showing an example of a lift-type wind turbine as a conventional example, where (a) is a plan view and (b) is a perspective view. [Figure 10] FIG. 1 is a schematic diagram showing an example of a conventional drag-type wind turbine, where (a) is a plan view and (b) is a perspective view. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0024] Below, a vertical axis wind turbine 100 as an embodiment of the present invention will be described with reference to the attached drawings. Note that in order to make the drawings easier to understand, the size and dimensions of each part are exaggerated and may not necessarily match the actual product. Each drawing should be viewed according to the direction of the symbols, and the directions are expressed as up, down, left, right, front, and back based on the direction. In order to make the drawings easier to understand, some parts that actually exist may be omitted, and the shape and configuration may differ from drawing to drawing.

[0025] <Configuration of a vertical axis wind turbine> The vertical wind turbine 100 according to the present invention is a wind turbine that is based on the drag type wind turbine (see FIG. 10) described as a conventional example, and has an added function of making the rotation center β of the offset auxiliary arm 14 in the drag type wind turbine coincide with the axis center α of the main shaft 10 under a certain condition. For the purpose of facilitating comparison with the conventional example, the parts that are structurally or mechanically the same or similar to the wind turbine of the conventional example will be described by using the same reference numerals and the last two digits of the numerals used in the drawings showing the conventional example (FIGS. 9 and 10).

[0026] 1 and 2, a vertical wind turbine 100 shown as an example of an embodiment of the present invention includes a main shaft 110 that is installed vertically, and a plurality of (four in this example) blades 120 that revolve around the main shaft 110. Each blade 120 is supported by a main arm 112 that extends radially outward from the main shaft 110 so as to be rotatable about a pitch axis (an axis that rotates by a main arm-blade joint 170 that connects the main arm 112 and the blade 120) that is parallel to the main shaft 110.

[0027] In addition to the main arm 112, an auxiliary arm 114 is provided so as to connect the main shaft 110 and the blade 120 (the tip end portion thereof) and regulates the rotation angle (pitch angle) of the blade 120.

[0028] An offset plate 141 extending in the horizontal direction is provided at the upper end of the main shaft 110. The offset plate 141 is rotatably installed on the main shaft 110 and rotates independently of the rotation of the main shaft 110. Furthermore, a slant shaft 142 extending obliquely upward from the offset plate 141 is fixed on the offset plate 141. Note that the slant shaft 142 in the drawing has a part that extends vertically, but this part is a design matter and the entire shaft may be oblique. A weather vane 130 is attached to the tip of the slant shaft 142, and the orientation of the offset plate 141, i.e., the offset direction, changes when the weather vane 130 catches wind.

[0029] A disk body 150 and a rotating frame 154 that rotates around the disk body 150 are attached on the slant shaft 142 so as to be slidable along the slant shaft 142. A through hole 151 is formed obliquely in the disk body 150 so that the slant shaft 142 can pass through, and the rotating frame 154 is assembled around the disk body 150 via a plurality of rollers 152. One end of the auxiliary arm 114 described above is assembled to the rotating frame 154 via a joint (auxiliary arm-rotating frame joint 174). With this configuration, the disk body 150 and the rotating frame 154, as well as one end of the auxiliary arm 114, are configured to be able to move up and down along the slant shaft 142.

[0030] As a result, as shown in Fig. 1, when disk body 150 is located below slant shaft 142 (when the wind speed is below a certain level), axis center α of main shaft 110 and center of rotation β of rotating frame 154 are offset by the presence of offset plate 141. On the other hand, as shown in Fig. 2, when disk body 150 is located above slant shaft 142 (when the wind speed is above a certain level), axis center α of main shaft 110 and center of rotation β of rotating frame 154 coincide with each other.

[0031] Although the illustration is omitted in FIGS. 1 and 2 for ease of understanding, the structure of the rotary frame 154 will be described in more detail with reference to FIGS.

[0032] The disk body 150 and the rotating frame 154 do not float on the offset plate 141, but are supported to a certain extent by legs 156 extending downward from the rotating frame 154, through holes that vertically penetrate the legs 156 and the rotating frame 154, a vertical guide 161 inserted into the through hole, and a roller 158 attached to the lower end of the vertical guide 161. With this configuration, the disk body 150 itself does not rotate, but the rotating frame 154 is configured to be able to move up and down along the vertical guide 161 while always rotating in conjunction with the rotation of the wind turbine when the wind turbine is rotating.

[0033] Next, an upward movement mechanism for moving the disk body 150 upward along the slant shaft 142 will be described with reference to FIGS.

[0034] 5 shows a first embodiment of the upward movement mechanism. Here, a weight (revolving element) 180 that rotates integrally with the rotating frame 154 is attached to the outer periphery of the rotating frame 154. This weight 180 is connected by a wire 182 to the vicinity of the upper end of the vertical guide 161 via a guide roller 184 installed on the rotating frame 154. In other words, when the weight 180 is pushed outward in the radial direction by centrifugal force, the wire 182 is pulled, and the rotating frame 154 is moved upward by the action of the guide roller 184.

[0035] Although not shown in the drawing, an identical weight 180 is also installed on the opposite side. As a result, when the rotation speed of the rotating frame 154 increases and the centrifugal force applied to the weight 180 exceeds a certain level, the weight overcomes the weight of the disk body 150 and its associated members, and the disk body 150 moves diagonally upward along the slant shaft 142 together with the rotating frame 154. Naturally, one end of the auxiliary arm 114 connected to the rotating frame 154 via a joint (auxiliary arm-rotating frame joint 174) also moves diagonally upward along the slant shaft 142. When the centrifugal force falls below a certain level, the weight returns to its original position under its own weight.

[0036] Of course, the upward movement mechanism is not limited to the above configuration. In order to efficiently utilize the centrifugal force even with a light weight weight 180, a configuration as shown in FIG. 6 (a second embodiment of the upward movement mechanism) may be adopted. In FIG. 6, a part of the rotating frame 154 may be configured to protrude largely outward in the radial direction as shown in the figure (in this case, for example, a joint (auxiliary arm-rotating frame joint 174) that connects with the auxiliary arm 114 is installed below the part shown in the figure and is not shown in the figure), and a rotating arm 155 may be provided at the protruding end via a link 159. In this configuration, the more the rotating arm 155 is positioned toward the protruding direction of the rotating frame 154, the more the wire 182 is pulled, and the rotating frame 154 moves upward. With this configuration, it is possible to configure an upward movement mechanism by utilizing the centrifugal force generated in the weight 180 by rotation, without increasing the weight of the weight 180 unnecessarily.

[0037] Further, the limiting mechanism will be described with reference to Figs. 7 and 8, assuming the second embodiment of the upward movement mechanism. As shown in Fig. 7(a), before the offset canceling mechanism is activated, the rotating arm 155 is closed. After that, as shown in Fig. 7(b), when the rotation speed of the wind turbine reaches a certain level or more, the rotating arm 155 opens and the offset canceling mechanism is activated. At this time, the rotating arm 155 is configured such that a protrusion 191 formed at the base of the rotating arm 155 is caught by a hook 192 (supported by a spring 193) installed on the rotating frame 154 and does not open any further. Furthermore, when the rotation speed of the wind turbine increases too much and reaches a dangerous level, the force that the rotating arm 155 tries to open overcomes the spring 193 supporting the hook 192, and the rotating arm 155 is configured to open to the maximum position as shown in Fig. 7(c). Here, these protrusions 191, hooks 192, and springs 193 function as a limiting mechanism.

[0038] FIG. 8 is a schematic diagram showing the state of the disk body 150 and the blade 120 according to the movement of the limiting mechanism. FIG. 8(a)(b) shows the state of the disk body 150 and the blade 120 before the offset canceling mechanism is activated and when the rotating arm 155 is closed. FIG. 8(c)(d) shows the state of the disk body 150 and the blade 120 when the rotation speed of the windmill reaches a certain level or more, the rotating arm 155 is open, and the offset canceling mechanism is activated (i.e., the limiting mechanism is also activated). FIG. 8(e)(f) shows the state of the disk body 150 and the blade 120 when the rotation speed of the windmill increases too much to a dangerous level, and the force of the rotating arm 155 to open overcomes the spring 193 supporting the hook 192 and spreads to the maximum position (i.e., the limiting mechanism is released).

[0039] <Action and Function of Vertical Axis Wind Turbines> As described above, the present invention is a vertical wind turbine 100 including a main shaft 110 installed vertically and a number of blades 120 revolving around the main shaft 110, the blades 120 being supported by a main arm 112 extending radially outward from the main shaft 110 so as to be rotatable about a pitch axis parallel to the main shaft 110, and an auxiliary arm 114 is provided separately from the main arm 112 so as to connect the main shaft 110 and the blades 120 via an offset canceling mechanism 140 and regulate the rotation angle (pitch angle) of the blades 120, and when the wind speed is equal to or lower than a predetermined value, the auxiliary arm 114 is provided on the blades 120 so that a position offset horizontally from the main shaft 110 according to the wind direction becomes the center of rotation β, and an offset canceling mechanism is provided to cancel the offset when the wind speed becomes equal to or higher than a predetermined value.

[0040] This configuration makes it possible to provide a hybrid vertical wind turbine that ensures the starting performance of a drag type wind turbine at low wind speeds while realizing the efficiency of a lift type wind turbine at high wind speeds. That is, when the wind speed exceeds a certain level, the offset cancellation mechanism is activated, the rotation center β of the auxiliary arm 114 coincides with the axis α of the main shaft 110, and the rotation angles (pitch angles) of all the blades 120 become the same. That is, when the wind speed exceeds a certain level, the type automatically changes from the drag type to the lift type, eliminating the disadvantages of both the drag type and the lift type.

[0041] The offset cancel mechanism includes a slant shaft 142 extending obliquely upward from the offset position toward the axial center of the main shaft 110, a disk body 150 that moves along the slant shaft 142, and a rotating frame 154 that is rotatably supported by the disk body 150, the auxiliary arm 114 is supported by the rotating frame 154, and has an upward movement mechanism that moves the disk body 150 upward along the slant shaft 142.

[0042] This configuration realizes a change in the rotation angle (pitch angle) of the wing 120 from the drag type to the lift type. That is, by moving the disk body 150 diagonally upward using the slant shaft 142, the rotation center β of the auxiliary arm 114, which was originally offset by the offset plate 141, is made to coincide with the axis α of the main shaft 110. Because the offset is canceled by such a simple mechanism based on an unconventional idea, a complex configuration or large power is not required, and it is possible to make the device extremely lightweight.

[0043] Also, when the action of the upward movement mechanism is removed, the disk body 150 is returned downward along the slant shaft 142 by its own weight.

[0044] With this configuration, the change from the lift type to the drag type when the wind weakens is achieved only by its own weight (the weight of the disk body 150 and the members supported by the disk body 150 or the members supported by the disk body 150), eliminating the need for a control or mechanism for returning the disk body 150 downward, and allowing the entire device to be constructed with a lightweight body.

[0045] In addition, the upward movement mechanism has a weight (revolver) 180 that revolves around the main shaft 110 together with the wing 120, and is characterized in that it uses the centrifugal force acting on the weight 180 to move the disk body 150 upward.

[0046] With this configuration, it is possible to lift the disk 150 using only the rotation of the windmill without obtaining power from an external source, that is, to cancel the offset of the rotation center β of the auxiliary arm 114.

[0047] The upward movement mechanism is also equipped with a limiting mechanism that limits the upward movement of the disk body 150 to an upper limit height, and the limiting mechanism is released only when the wind speed exceeds a specified value, causing the disk body 150 to rise above the upper limit, thereby offsetting the center of rotation β of the auxiliary arm 114 in the opposite direction from the initial offset position β, thereby changing the rotation angle (pitch angle) of the blades 120 and stalling the revolution of the blades 120.

[0048] This configuration makes it possible to prevent damage caused by excessively high speed rotation, etc. Furthermore, the limiting mechanism is realized by directly utilizing the slant shaft 142 that constitutes the offset cancellation mechanism, which has the great advantage of reducing the number of additional mechanisms required to realize the limiting mechanism and not sacrificing light weight.

[0049] Furthermore, if a generator that generates electricity by the rotation of the main shaft 110 of the vertical wind turbine 100 described above is added, the present invention functions as a wind power generator.

[0050] Other configuration examples The upward movement mechanism described above is realized by utilizing the centrifugal force generated in the revolver without obtaining external power, but the disk body may also be moved upward along the slant shaft by utilizing the power of a servo motor.

[0051] The offset cancellation mechanism according to the present invention is realized by a very simple and lightweight structure that uses a slant shaft to move the disk body diagonally up and down, so that even when the disk body is moved by a servo motor, it is easy to control and can be realized with small power. In other words, the extent to which the power consumption of the servo motor cancels out the actual amount of power generation (when generating power using the wind turbine) can be kept low.

[0052] In addition, in the above description and the attached drawings, the weather vane 130 is installed above the wing 120, but this is not limited thereto. For example, it may be installed below the wing 120, or in some cases, it may be installed between (on the inside of) the wing 120 and the main shaft 110. That is, the essential part is to move the offset canceling mechanism along the slant shaft that faces diagonally upward, and the design of this offset canceling mechanism may be changed, and accordingly the weather vane 130 may be installed below the auxiliary arm 114, on the inside of the wing 120 and the main arm 112, or the like. [Explanation of symbols]

[0053] 100...Vertical windmill 110...Spindle 112 Main arm 114 Auxiliary arm 120...Wings 130...Weather vane 140 Offset cancellation mechanism 141 Offset plate 142 Slant shaft 150...Disc 151...Through hole 152 Laura 154 Rotating frame 156...legs 158...Laura 160...Upward movement mechanism 161 Vertical guide 170···Main arm·Wing joint (pitch axis) 172 Auxiliary arm wing joint 174···Auxiliary arm·Rotary frame joint 180... weight 182 Wire 184 Guide roller α: Center of main shaft β: Rotation center of auxiliary arm

Claims

1. A vertical wind turbine having a main shaft installed vertically and a plurality of blades revolving around the main shaft, The blade is supported by a main arm extending radially outward from the main shaft so as to be rotatable about a pitch axis parallel to the main shaft, a sub-arm that is provided separately from the main arm and connects the main shaft and the blade to regulate the pitch angle of the blade, When the wind speed is equal to or lower than a predetermined value, the auxiliary arm is mounted on the wing such that a position offset in a horizontal direction from the main shaft in accordance with a wind direction becomes a rotation center, An offset canceling mechanism is provided to cancel the offset when the wind speed reaches a predetermined value or more, the offset canceling mechanism includes a slant shaft extending obliquely upward from the offset position toward an axial direction of the spindle, a disk body moving along the slant shaft, and a rotating frame rotatably supported by the disk body, The auxiliary arm is supported from the rotary frame, An upward movement mechanism for moving the disk upward along the slant shaft A vertical wind turbine characterized by:

2. In claim 1, When the offset canceling mechanism is activated, the rotation center of the auxiliary arm coincides with the axis of the main shaft, and the pitch angles of all the blades become the same. A vertical wind turbine characterized by:

3. In claim 2, When the upward movement mechanism is no longer in operation, the disk body is returned downward along the slant shaft by its own weight. A vertical wind turbine characterized by:

4. In claim 3, The upward movement mechanism has a revolver that revolves around the main shaft together with the wing, and moves the disk body upward by utilizing the centrifugal force applied to the revolver. A vertical wind turbine characterized by:

5. In claim 4, The upward movement mechanism uses the power of a servo motor to move the disk upward along the slant shaft. A vertical wind turbine characterized by:

6. In any one of claims 3 to 5, the upward movement mechanism includes a limiting mechanism that limits the upward movement of the disk body to an upper limit height, The limiting mechanism is released only when the wind speed exceeds a specified value, and the disk body rises beyond the upper limit height, thereby offsetting the rotation center of the auxiliary arm in a direction opposite to the offset position, thereby changing the pitch angle of the blades and stalling the revolution of the blades. A vertical wind turbine characterized by:

7. A wind power generator including a generator that generates electricity by rotation of the main shaft of the vertical wind turbine according to any one of claims 1 to 5.

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