Vertical-axis wind turbine and wind power generator using said wind turbine

Abstract

A vertical wind turbine 100 comprises a main shaft 110 installed vertically, and a plurality of blades 120 that revolve around the main shaft 110. Each blade 120 is supported by a main arm 112, which extends outward in a radial direction from the main shaft 110, so as to be rotatable about a pitch axis parallel to the main shaft 110, and has, separately from the main arm 112, an auxiliary arm 114 that is installed to connect the main shaft 110 and the blade 120 and regulates a rotation angle (pitch angle) of the blade 120. The auxiliary arm 114 is installed on the blade 120 such that, when a wind speed is equal to or lower than a predetermined value, a position that is offset in a horizontal direction from the main shaft 114 in accordance with the wind direction becomes a rotation center β, and has an offset cancellation mechanism for canceling the offset when the wind speed becomes equal to or higher than the predetermined value.

Description

Vertical axis wind turbines and wind power generators using these turbines

[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.

[0002] Vertical axis wind turbines include lift-type wind turbines that obtain rotational force by utilizing the lift force acting on the blades, and drag-type wind turbines that 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 comprises 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 vertically installed main shaft 10 and four blades 20 that revolve around the main shaft 10. The blades 20 are supported by main arms 12 extending 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 ) parallel to the main shaft 10. Furthermore, in addition to the main arms 12, auxiliary arms 14 are provided that connect the main shaft 10 and the tip end of the blades 20 and regulate the rotation angle (pitch angle) of the blades 20. The auxiliary arms 14 are mounted on the blades so that the center of rotation is a position β that is horizontally offset from the main shaft 10. The offset direction changes as the extension direction of the offset plate 40 changes depending on the wind direction that the weather vane 30 receives.

[0005] "There are two types of vertical axis wind turbines: drag turbines and lift turbines." https: / / www2s.biglobe.ne.jp / ~wesra / vawt / vawt.html

[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) quickly reaches a plateau, 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 start-up 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 that uses the same.

[0009] In order to solve the above problems, the present invention provides a vertical wind turbine comprising a main shaft that is installed vertically and a plurality of blades that revolve around the main shaft, wherein the blades are 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 wherein an auxiliary arm is provided separately from the main arm so as to connect the main shaft and the blades (through an offset cancellation mechanism, which will be described later) and regulate the rotation angle (pitch angle) of the blades, and wherein when the wind speed is below a predetermined value, the auxiliary arm is provided on the blades so that a position that is offset horizontally from the main shaft depending on the wind direction becomes the center of rotation, and wherein an offset cancellation mechanism is provided to cancel the offset when the wind speed exceeds the predetermined value.

[0010] This configuration makes it possible to provide a hybrid vertical wind turbine that can ensure the start-up performance of a drag-type wind turbine at low wind speeds while achieving 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 system automatically changes from drag type to lift type, eliminating the disadvantages of both the drag type and lift type.

[0011] The offset cancellation mechanism is characterized by comprising 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 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 rotation center of the auxiliary arm, which was originally positioned offset, is aligned with the axis of the main shaft. Because the offset is canceled out by this simple mechanism based on an unconventional concept, it does not require a complex configuration or large power, and can be made extremely lightweight.

[0013] Furthermore, when the upward movement mechanism ceases to function, 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 weight of the members supported by the disk body), so there is no need for a control or mechanism to return the disk body downward, and the entire structure can be made lightweight.

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

[0016] With this configuration, the disk body can be raised using only the rotation of the wind turbine without obtaining external power, i.e., the offset of the rotation center of the auxiliary shaft can be canceled.

[0017] The upward movement mechanism may use the 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 configuration in which the disk body is moved diagonally up and down using a slant shaft, so that even when the disk body is moved by a servo motor, it is easy to control and can be realized with little power. In other words, (when generating power using the wind turbine) the extent to which the power consumption of the servo motor cancels out the actual amount of power generated can be kept low.

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

[0020] This configuration makes it possible to prevent situations such as damage caused by excessively high rotation speeds. Furthermore, the limiting mechanism is realized by directly utilizing the slant shaft that constitutes the offset cancellation mechanism, which has the great advantage of requiring few additional mechanisms to realize the limiting mechanism and not sacrificing light weight.

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

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

[0023] 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 the offset cancellation mechanism is activated; 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 the offset cancellation mechanism is activated; FIG. 3 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 the offset cancellation mechanism is activated; FIG. 4 is a perspective view of a vertical wind turbine according to an embodiment of the present invention (with some parts omitted), showing a concept of the offset cancellation mechanism (with some parts omitted); FIG. 5 is a partial cross-sectional view of a concept of the offset cancellation mechanism (with some parts omitted), showing (a) a state before the offset cancellation mechanism is activated, and (b) a state after the offset cancellation mechanism is activated; FIG. 6 is a perspective view of a first embodiment of an upward movement mechanism (with some parts omitted); FIG. 7 is a perspective view of a second embodiment of an upward movement mechanism (with some parts omitted); FIG. 8 is a diagram showing an example of a limiting mechanism and its operation, showing (a) a state before the offset cancellation mechanism is activated and the limiting mechanism is not activated, (b) a state after the offset cancellation mechanism is activated and the limiting mechanism is activated, and (c) a state after the limiting mechanism is released.

[0023] Figures 1A and 1B are simplified views showing the movement of the disk body with the operation of the limiting mechanism and the state of the blades at that time, where (a) is a plan view of a state before the offset cancellation mechanism is activated and the limiting mechanism is not activated either, (b) is a perspective view of the same, (c) is a plan view of a state after the offset cancellation mechanism is activated and the limiting mechanism is also activated, (d) is a perspective view of the same, (e) is a plan view of a state with the limiting mechanism released, and (f) is a perspective view of the same.

[0024] Figures 1A and 1B are schematic views 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.

[0025] Figures 1A and 1B are schematic views showing an example of a drag-type wind turbine as a conventional example, where (a) is a plan view and (b) is a perspective view.

[0024] Below, a vertical axis wind turbine 100, which is an example of an embodiment of the present invention, will be described with reference to the accompanying drawings. Note that in order to facilitate understanding of the drawings, the size and dimensions of each part are exaggerated and may not necessarily match those of the actual product. Furthermore, each drawing should be viewed in accordance with the direction of the reference numerals, and the directions are expressed as up, down, left, right, front, and back based on these directions. Furthermore, in order to facilitate understanding of the drawings, some parts that actually exist may be omitted, and the shape and configuration may differ from drawing to drawing.

[0025] <Configuration of 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 aligning the rotation center β of the offset auxiliary arm 14 in the drag type wind turbine with the axis α of the main shaft 10 under predetermined conditions. For the purpose of facilitating comparison with the conventional example, parts that are structurally or mechanically the same or similar to the wind turbine of the conventional example will be described using the same reference numerals and last two digits as those 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 that is bridged between the main shaft 110 and the blade 120 (the tip end of the blade 120 ) and regulates the rotation angle (pitch angle) of the blade 120 .

[0028] A horizontally extending offset plate 141 is provided at the upper end of the main shaft 110. The offset plate 141 is rotatably mounted on the main shaft 110 and rotates independently of the rotation of the main shaft 110. A slant shaft 142 is fixed to the top of the offset plate 141 and extends diagonally upward from the offset plate 141. While the slant shaft 142 in the drawing has a portion that extends vertically, this portion is a design feature and the entire shaft may be diagonal. 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 150 and a rotary frame 154 that rotates around the disk 150 are mounted on the slant shaft 142 so as to be slidable along the slant shaft 142. A through-hole 151 large enough to allow the slant shaft 142 to pass through is formed obliquely in the disk 150, and the rotary frame 154 is attached around the disk 150 via a plurality of rollers 152. One end of the auxiliary arm 114 described above is attached to the rotary frame 154 via a joint (auxiliary arm / rotary frame joint 174). With this configuration, the disk 150, the rotary frame 154, and one end of the auxiliary arm 114 can 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 pass vertically through the legs 156 and the rotating frame 154, vertical guides 161 that are inserted into the through-holes, and rollers 158 that are attached to the lower ends of the vertical guides 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 guides 161 while constantly rotating in conjunction with the rotation of the wind turbine when the wind turbine is rotating.

[0033] Next, the upward movement mechanism that moves 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. In this example, a weight (revolver) 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 projected radially outward by centrifugal force, the wire 182 is pulled, and the action of the guide roller 184 moves the rotating frame 154 upward.

[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 acting on the weight 180 exceeds a certain level, the weight overcomes the weight of the disk body 150 and its associated components, 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, which is 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. To efficiently utilize centrifugal force even with a lightweight weight 180, a configuration such as that shown in FIG. 6 (a second embodiment of the upward movement mechanism) may be employed. In FIG. 6 , a portion of the rotary frame 154 may be configured to significantly protrude radially outward as shown (in this case, for example, a joint (auxiliary arm / rotary frame joint 174) connecting to the auxiliary arm 114 is installed below the illustrated portion and therefore not visible in the drawing), and a rotary arm 155 may be further attached to the protruding end via a link 159. In this configuration, the more the rotary arm 155 is positioned in the direction of protrusion of the rotary frame 154, the more the wire 182 is pulled, causing the rotary frame 154 to move upward. This configuration makes it possible to configure an upward movement mechanism that utilizes the centrifugal force generated in the weight 180 due to rotation, without unnecessarily increasing the weight of the weight 180.

[0037] Furthermore, assuming this second embodiment of the upward movement mechanism, the limiting mechanism will be described with reference to FIGS. 7 and 8. As shown in FIG. 7(a), before the offset canceling mechanism is activated, the rotating arm 155 is closed. Then, as shown in FIG. 7(b), when the rotation speed of the wind turbine reaches a certain level or higher, the rotating arm 155 opens and the offset canceling mechanism is activated. At this time, the rotating arm 155 is prevented from opening any further by a protrusion 191 formed at the base of the rotating arm 155 being caught by a hook 192 (supported by a spring 193) installed on the rotating frame 154. If the rotation speed of the wind turbine increases too much and reaches a dangerous level, the force tending to open the rotating arm 155 overcomes the spring 193 supporting the hook 192, and the rotating arm 155 is configured to open to its maximum position as shown in FIG. 7(c). Here, the protrusion 191, hook 192, and spring 193 function as a limiting mechanism.

[0038] FIG. 8 is a schematic diagram showing the states of the disk body 150 and the blades 120 in response to the movement of the limiting mechanism. FIGS. 8( a) and 8(b) show the states of the disk body 150 and the blades 120 before the offset cancellation mechanism is activated and when the rotating arm 155 is closed. FIGS. 8(c) and 8(d) show the states of the disk body 150 and the blades 120 when the rotation speed of the wind turbine reaches a certain level or higher, the rotating arm 155 is open, and the offset cancellation mechanism is activated (i.e., the limiting mechanism is also activated). FIGS. 8(e) and 8(f) show the states of the disk body 150 and the blades 120 when the rotation speed of the wind turbine reaches a dangerous level and the force attempting to open the rotating arm 155 overcomes the spring 193 supporting the hook 192 and the blades are extended to their maximum position (i.e., the limiting mechanism is released).

[0039] <Actions and Functions of a Vertical Axis Wind Turbine> As explained above, the present invention is characterized in that the vertical wind turbine 100 includes a main shaft 110 that is installed vertically and a plurality of blades 120 that revolve around the main shaft 110, the blades 120 are supported by main arms 112 that extend radially outward from the main shaft 110 so as to be rotatable about pitch axes that are parallel to the main shaft 110, and the invention further includes auxiliary arms 114 that are installed separately from the main arms 112 to connect the main shaft 110 and the blades 120 via offset cancellation mechanisms 140 and regulate the rotation angles (pitch angles) of the blades 120, and when the wind speed is below a predetermined value, the auxiliary arms 114 are installed on the blades 120 so that a position that is offset horizontally from the main shaft 110 depending on the wind direction becomes the center of rotation β, and the invention further includes an offset cancellation mechanism that cancels the offset when the wind speed becomes above a predetermined value.

[0040] This configuration makes it possible to provide a hybrid vertical wind turbine that can ensure the start-up performance of a drag-type wind turbine at low wind speeds while achieving 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 system automatically changes from the drag type to the lift type, thereby 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 150 that moves along the slant shaft 142, and a rotary frame 154 that is rotatably supported by the disk 150, the auxiliary arm 114 being supported by the rotary frame 154, and an upward movement mechanism that moves the disk 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 using the slant shaft 142 to move the disk body 150 diagonally upward, 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 out by this simple mechanism based on an unconventional concept, no complex configuration or large power is required, and it is possible to make the aircraft extremely lightweight.

[0043] Furthermore, when the upward movement mechanism ceases to function, the disk body 150 is returned downward along the slant shaft 142 by its own weight.

[0044] 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 150 and the members supported by the disk body 150 or the members supported by the disk body 150), so there is no need for a control or mechanism to return the disk body 150 downward, and the entire configuration can be made lightweight.

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

[0046] With this configuration, the disk body 150 can be raised using only the rotation of the windmill without obtaining external power, that is, the offset cancellation of the rotation center β of the auxiliary arm 114 can be realized.

[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 is characterized by being equipped with a stall mechanism that, only when the wind speed exceeds a specified value, releases the limiting mechanism and causes the disk body 150 to rise above the upper limit, thereby offsetting the rotation center 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 blade 120 and stalling the revolution of the blade 120.

[0048] This configuration can prevent damage due to excessive rotational speed, 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 amount of additional mechanisms required to realize the limiting mechanism and not sacrificing lightweight design.

[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 has a very simple and lightweight configuration, achieved by using 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 little power. In other words, (when generating power using the wind turbine) the extent to which the power consumption of the servo motor cancels out the actual amount of power generated can be kept low.

[0052] Furthermore, in the above description and the accompanying drawings, the weather vane 130 is installed above the wing 120, but this is not limiting. For example, it may be installed below the wing 120, or in some cases, it may be installed between (inside) 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, inside the wing 120 and main arm 112, or the like.

[0053] DESCRIPTION OF SYMBOLS 100: Vertical wind turbine 110: Main shaft 112: Main arm 114: Auxiliary arm 120: Blade 130: Weathervane 140: Offset cancellation mechanism 141: Offset plate 142: Slant shaft 150: Disk body 151: Through hole 152: Roller 154: Rotating frame 156: Leg 158: Roller 160: Upward movement mechanism 161: Vertical guide 170: Main arm / blade joint (pitch axis) 172: Auxiliary arm / blade joint 174: Auxiliary arm / rotating frame joint 180: Weight 182: Wire 184: Guide roller α: Axis center of main shaft β: Rotation center of auxiliary arm

Claims

1. A vertical wind turbine comprising a main shaft installed vertically and a plurality of blades that revolve around the main shaft, wherein the blades are supported by main arms extending radially outward from the main shaft so as to be rotatable around a pitch axis parallel to the main shaft, and wherein an auxiliary arm is provided separately from the main arm to connect the main shaft and the blades and regulate the pitch angle of the blades, wherein when the wind speed is below a predetermined level, the auxiliary arm is provided on the blades so that its center of rotation is a position offset horizontally from the main shaft depending on the wind direction, and wherein an offset cancellation mechanism is provided to cancel the offset when the wind speed exceeds the predetermined level, wherein the offset cancellation mechanism comprises a slant shaft extending diagonally upward from the offset position toward the axial center of the main shaft, a disk that moves along the slant shaft, and a rotating frame rotatably supported by the disk, wherein the auxiliary arm is supported by the rotating frame, and wherein the vertical wind turbine has an upward movement mechanism that moves the disk upward along the slant shaft.

2. A vertical wind turbine according to claim 1, characterized in that when the offset cancelling 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.

3. A vertical wind turbine according to claim 2, characterized in that when the action of the upward movement mechanism ceases, the disk body is returned downward along the slant shaft by its own weight.

4. A vertical wind turbine according to claim 3, characterized in that the upward movement mechanism has a revolver that revolves around the main axis together with the blades, and moves the disk body upward by utilizing the centrifugal force acting on the revolver.

5. A vertical wind turbine according to claim 4, characterized in that the upward movement mechanism uses the power of a servo motor to move the disk body upward along the slant shaft.

6. A vertical wind turbine as set forth in any one of claims 3 to 5, characterized in that the upward movement mechanism is provided 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 height, thereby offsetting the center of rotation 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.

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

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