JP5941899B2 - Vertical axis windmill - Google Patents

Description

  The present invention relates to a vertical axis wind turbine that is used in wind power generation and the like and includes lift-type blades and drag-type blades.

  The vertical axis type windmill is advantageous in that it is smaller than the horizontal axis type windmill and can be rotated regardless of the wind direction.

  The blades of the vertical axis type wind turbine include a drag type and a lift type. The drag-type blades can start and rotate smoothly even with a low-speed wind, but there is a disadvantage that the peripheral speed of the rotating substrate to which the drag-type blades are attached cannot exceed the wind speed. The lift type blades can make the peripheral speed of the rotating substrate to which the lift type blades are attached higher than the wind speed, but have the disadvantages of low driving efficiency at low wind speeds and poor startability.

  Then, the vertical axis type windmill provided with both a drag type | mold blade | wing and a lift type | mold blade | wing is known (example: patent document 1 and 2). The vertical axis type windmill of Patent Document 1 includes drag type blades and lift type blades alternately in the rotation direction.

  In the vertical axis type windmill of Patent Document 2, the drag-type blades and the lift-type blades are in a region connecting the three points of the front and rear ends of the lift-type blades in the rotation direction and the rotation center of the rotating substrate. Drag type blades are attached to the rotating substrate. In the vertical axis type windmill, the drag type blades are set so as not to face the wind during the rotation period in which the head wind is received. As a result, the drag-type blade eliminates the stagnation of air generated on the convex side (windward side) and the negative pressure generated on the concave side (downwind side) during the counter-wind rotation period, and increases the rotational driving force. Increase.

  On the other hand, Patent Document 3 discloses a drag type vertical axis wind turbine that reduces the resistance of the drag type blades against the head wind. In the vertical axis type windmill, a plurality of small streamline cross-section blades each have a rotation shaft and are rotatably attached to the rotating substrate via the rotation shaft. These rotating shafts are arranged on the rotating substrate in a row at intervals shorter than the length of the blades. Further, on both sides of the rotating shaft row, stopper rods are fixed to the rotating substrate.

  The plurality of blades are parallel to the wind direction during the rotation period in which the head wind is received, and the resistance force of the blades to the wind becomes zero by passing the wind between them. Also, during the tailwind rotation period, the blade closest to the stopper rod rotates and stops at the stopper rod, and the rotating shaft of the blade on the stopper rod side in turn from the blade closer to the stopper rod. The entire blades are arranged without gaps so as to form one plate as one drag blade, and generate a large drag against the tailwind.

Japanese Patent No. 4736674 Japanese Patent No. 4727277 JP 2006-125378 A

  Although the vertical axis type windmills of Patent Documents 1 and 2 are equipped with both lift-type blades and drag-type blades, the lift-type blades receive wind on the side surface during the windward rotation period. In addition, a large vortex that causes a reduction in rotational driving force is generated. Since this vortex becomes stronger as the lift-type blade is longer in the rotation direction, it is desirable that the lift-type blade is shorter in the rotation direction in order to weaken the vortex. However, downsizing of the lift-type blades, conversely, weakens the lift force during the period in which the lift-type blades receive the head wind, leading to a decrease in the rotational driving force.

  In addition, each drag type blade in the vertical axis wind turbines of Patent Documents 1 and 2 has a rotation direction in which the drag type blade on the front side in the rotation direction does not disturb the wind hitting the front type drag blade during the rotation period in which the wind is received from behind. It was only attached to the rotating substrate at intervals, and the period for generating drag was short, and wind power was not fully utilized effectively.

  An object of the present invention is to provide a vertical axis type windmill capable of suppressing vortices and increasing rotational driving force while being equipped with both lift-type blades and drag-type blades.

The vertical axis type windmill according to the present invention includes a vertical axis, a rotating board fixed to the vertical axis and rotating integrally with the vertical axis, and a plurality of rotating boards that are fixed to the rotating board and receive wind to rotate the rotating board. A vertical axis wind turbine comprising blades, wherein the plurality of blades include lift-type blades and drag-type blades, and a plurality of blade placement regions are spaced from each other in the rotation direction of the rotating substrate. The lift-type blades and the drag-type blades are set on the substrate, and the blades in the blade disposition region are located on the outer side and the inner side with respect to a circumferential line with a predetermined radius centered on the rotation center of the rotating substrate. And only one lift type blade is disposed at the rear end of the rotating substrate in the rotational direction in each blade disposed region,
A plurality of the drag type blades are arranged in each blade arrangement region with a spacing in the rotation direction ahead of the lift type blades in the rotation direction of the rotary substrate. As the drag-type blades are arranged in front of the rotation direction, the end on the vertical axis side protrudes toward the vertical axis, and the deflection angle of each blade around the rotation center is set on the vertical axis side of the blade. When the end is on the windward side with respect to the center of rotation on the first straight line extending in parallel with the wind direction through the center of rotation, 0 ° is defined, and the rotation direction of the rotating substrate is defined as a positive direction, When the deflection angle of each drag type blade in the front blade arrangement region becomes 90 ° between the blade arrangement regions adjacent to each other in the rotation direction, the drag type has a deviation angle of 90 ° in the front blade arrangement region. The blade and rear blade placement area do not overlap in the direction perpendicular to the wind direction Sea urchin, the vane arrangement area and the shape and dimensions of each blade are set in each blade formation regions, when the drag type blades other than the end of the drag type blades becomes declination 90 °, the polarized angle A 90 ° drag type blade passing through the end of the vertical axis of the drag type blade one behind in the rotation direction and projecting to the vertical axis side from a second straight line parallel to the first straight line; The rotation direction interval of the plurality of drag type blades is set in each blade arrangement region so as to have the remaining non-projecting portions, and in each blade arrangement region, each drag type blade has a declination of 0 °. Sometimes, the shape of the drag type blade is set so as to form a flow path substantially parallel to the wind direction and parallel to the wind direction on the rear side in the rotation direction .

  According to the present invention, the lift-type blade and the drag-type blade are disposed outside and inside the circumferential line having a predetermined radius in each blade arrangement region. Thus, the lift-type blade can receive wind and smoothly generate lift without being obstructed by the drag blade on the front side in the rotation direction. Moreover, the lift type blade | wing can be arrange | positioned at the rear-end part of each blade | wing arrangement | positioning area | region, and can shorten the length of a rotation direction. Thereby, the lift type blade | wing can suppress the eddy produced | generated on the leeward side of a lift type blade | wing during the rotation period of an upwind side. And the peripheral speed of the rotation board at the time of a strong wind can be ensured with the thing exceeding a wind speed by the installation of a lift type | mold blade | wing.

  On the other hand, the drag type blades in each blade arrangement region, when the declination becomes 90 °, the range does not overlap with the blade arrangement region on the rear side in the rotation direction in a direction perpendicular to the wind direction. The wind travels straight toward the drag type blades having a declination of 90 ° without being obstructed by the blades in the rear blade arrangement region. In the plurality of drag-type blades in each blade arrangement region, the front-side end protrudes toward the vertical axis as the front side blades. As a result, when the deflection angle of each drag type blade is 90 °, the protrusion of the rear side drag type blade in the wind direction is at the projecting portion protruding toward the vertical axis with respect to the rear side drag type blade. Receives wind and generates drag without shadows.

  If there is only one drag-type blade in each blade placement area, the deflection angle of the drag-type blade in each blade placement area is only one in each blade placement area. According to the invention, the number of drag blades in the blade arrangement region is equal to the number of drag blades, and each of the protrusions can be set in a shape in which the drag force increases, so that the rotational driving force due to the drag force is increased in the entire vertical axis type windmill. be able to.

  The plurality of drag-type blades in each blade arrangement region have a cross-sectional shape that is substantially parallel to the wind direction, unlike the lift-type blades, during the rotation period in which the blade arrangement region is on the windward side. Therefore, it is possible to prevent a vortex that inhibits the rotational driving force from being generated on the leeward side of the plurality of drag type blades in the blade arrangement region.

  In the vertical axis type windmill of the present invention, it is preferable that the ends on the anti-vertical axis side of the plurality of drag type blades in each blade arrangement region are arranged on the circumferential line.

  According to this configuration, after the wind hits the drag-type blade and generates a drag on the drag-type blade, any drag-type blade has a radius at the same radial position from the vertical axis as a position on the circumferential line. It is released in the direction outward, and then gets away from the rotating substrate smoothly by riding the wind flowing outside the rotating substrate. Therefore, the wind released from the drag type blades can be released to the outside of the rotating substrate while avoiding hitting the front side of the drag type blades on the rear side, thereby preventing a decrease in the rotational driving force due to the released wind. Can do.

FIG. FIG. FIG. 3 is a structural diagram of a rotating unit indicated by an angle different from the angle of FIG. 2.

  With reference to FIG. 1, the whole structure of the wind power generator 1 is demonstrated. The wind turbine generator 1 schematically includes a framework 2, a plurality of rotating units 14, and a generator 16. The framework 2 includes three or more (eg, four) bases 3, vertical columns 4, an upper support member 5, and a lower support member 6.

  The plurality of bases 3 are laid on the ground so as to be in positions corresponding to the vertices of a regular polygon (eg, square) having the plurality of vertices. Each vertical column 4 is fixed to each base 3 at the lower end, extends in the vertical direction, and reaches a predetermined height at the upper end. The upper support member 5 is fixed to the upper end of the vertical column 4 at each corner and is held horizontally. The lower support member 6 is fixed to an intermediate portion of the lower support member 6 at each corner, and is held horizontally at a predetermined height from the ground.

  The vertical shaft 9 is disposed in the frame 2 in the vertical direction. The bearing 10 is fixed to a portion of the upper support member 5 through which the vertical center line of the frame 2 passes, and rotatably supports the upper end portion of the vertical shaft 9. The speed increaser 11 is fixed to a portion of the lower support member 6 through which the axis of the vertical shaft 9 passes, and rotatably supports the lower end portion of the vertical shaft 9. The plurality of rotating units 14 are attached to the vertical shaft 9 at equal intervals in the vertical direction, are held at the attached height, and rotate integrally with the vertical shaft 9.

  The generator 16 is installed on the ground, and the drive shaft 17 is aligned with the axis of the vertical shaft 9 and protrudes upward in the vertical direction. The speed increaser 11 also serves as a rotary bearing that rotatably supports the lower end portion of the vertical shaft 9 and the upper end portion of the drive shaft 17 in addition to the role as a speed increaser. The speed increaser 11 increases the rotation of the vertical shaft 9 and transmits it to the drive shaft 17.

  The overall operation of the wind turbine generator 1 will be briefly described. The wind power generator 1 receives wind from any horizontal direction in the east, west, south, and north. Accordingly, the rotation unit 14 rotates, and the vertical shaft 9 rotates integrally with the rotation unit 14. The rotation of the vertical shaft 9 is increased by the speed increaser 11 and transmitted to the drive shaft 17. The generator 16 generates electric power by the rotation of the drive shaft 17. The generated electric power is stored in a storage battery (not shown), consumed at a user's home or business, or sold to an electric power company.

  2 and 3 show the structure of the rotating unit 14 shown with different declinations. 2 and 3 correspond to plan views (views of the upper surface side of the rotation unit 14) when the rotation unit 14 is viewed from the top to the bottom in the vertical direction. In addition, the lower surface side of the rotation unit 14 is a flat surface.

  Although not shown in FIGS. 2 and 3, the vertical axis 9 (FIG. 1) passes through the rotation center O of the circular substrate 21. The rotation unit 14 rotates in the rotation direction R with respect to the wind W having an arbitrary wind direction. For convenience of explanation of the operation and the like of the rotating unit 14, it is assumed that the wind direction of the wind W is the one shown in FIGS.

  In FIG. 2 and FIG. 3, a plurality of auxiliary lines (each auxiliary line has a leading symbol “C”) is described for convenience of explanation of the configuration of the rotation unit 14. These auxiliary lines are all illustrated for explaining the structure of the rotating unit 14, and do not indicate the outlines of the elements of the wind power generator 1. Definitions of the circumferential line Cr and the diameter lines Cp and Cq are as follows. The definition of the auxiliary lines Cx to Cz will be described later.

Circumference line Cr: a circle having a radius smaller than the circumferential edge of the circular substrate 21 and centering on the rotation center O.
Diameter line Cp: A straight line passing through the center of rotation O and parallel to the wind direction of the wind W.
Diameter line Cq: A straight line passing through the center of rotation O and perpendicular to the wind direction of the wind W.

  For convenience of describing the configuration of the rotation unit 14, a declination around the rotation center O is defined. The declination is 0 ° on the diameter line Cp on the windward side with respect to the rotation center O, and the rotation direction R is a positive direction. In addition, since the blades of the drag-type blades 24a to 24c and the lift-type blade 25 have a length in the rotation direction R, the deflection angle at the end on the rotation center O side is defined as the deflection angle of the blade.

  The blade arrangement area A is set on the circular substrate 21 at 90 ° intervals in the rotation direction R. In FIG. 2, the deviation of the leading drag type blade 24a in the blade arrangement region A (the hatched region where the diagonal lines in the two directions intersect) shown on the left, bottom, right and top with respect to the rotation center O is shown. The angles are 0 °, 90 °, 180 ° and 270 °, respectively. In FIG. 3, the deflection angles of the last drag type blades 24c in the blade arrangement region A shown on the left, bottom, right, and top with respect to the rotation center O are 0 °, 90 °, and 180 °, respectively. ° and 270 °.

  The rotating unit 14 includes a circular substrate 21 and a plurality of drag type blades 24 a to 24 c and a lift type blade 25 fixed on the circular substrate 21 in a predetermined arrangement. The circular substrate 21 is held at a predetermined height on a vertical shaft 9 (FIG. 1) penetrating the rotation center O by a predetermined holding member (not shown) on the lower surface side. It is attached so that it may rotate integrally.

  The blade arrangement area A is set on the upper surface of the circular substrate 21 at 90 ° intervals in the rotation direction R. For simplification of illustration, reference numerals Lf, Lo, Li, and u are shown for only the right blade disposition region A among the four blade disposition regions A of FIGS. The blade arrangement region A includes a front line Lf that defines a front edge in the rotation direction R, an outer arc Lo on a side edge far from the rotation center O, and an inner arc Li on a side edge closer to the rotation center O. It is defined by three lines.

  The centers of the outer arc Lo and the inner arc Li are both set on the circular substrate 21, and the radius of the outer arc Lo is larger than the radius of the inner arc Li. The inner arc Li and the outer arc Lo intersect on the circumference of the circle of the circular substrate 21. Further, the front line Lf and the outer arc Lo intersect at the circumference line Cr.

  In each blade arrangement region A, the drag type blades 24a to 24c and the lift type blades 25 are fixedly provided in order from the front in the rotation direction R with an interval in the rotation direction R. The lift type blade 25 occupies the rear end of the blade arrangement region A, and is opposite to the rotation center O of the lift type blade 25 (hereinafter referred to as “anti-O side”) and the rotation center O side (hereinafter referred to as “ The side edge of the “O side” corresponds to the rear end portions of the outer arc Lo and the inner arc Li.

The drag type blades 24a to 24c and the lift type blades 25 are disposed so that the following condition 1 is satisfied.
Condition 1: In the blade disposition region A, the lift-type blade 25 is disposed radially outside the circumferential line Cr, and the drag-type blades 24a to 24c are within a range not exceeding the circumferential line Cr outward. Arranged.

  In each blade arrangement region A, the O-side ends of the drag-type blades 24a to 24c are located on the inner arc Li. As a result, in each blade disposition area A, the O-side ends of the drag-type blades 24a to 24c are arranged in front of the rotation direction R, so that the O-direction, that is, the vertical shaft 9 (FIG. 1). It will protrude to. The distance between the O-side ends of the drag type blades 24a to 24c is equal to the length u along the inner arc Li. The distance u between the O-side end of the last drag-type blade 24c in the rotational direction R and the lift-type blade 25 is the lift-type blade from the O-side end of the drag-type blade 24c along the inner arc Li. 25 is defined as the length to the front end of the side edge on the O side (the front end is the front end on the inner arc Li).

  In order to explain in more detail the shapes and dimensions of the blade arrangement region A and the drag type blades 24a to 24c, auxiliary lines Cx, Cy, and Cz are defined in FIGS. The auxiliary lines Cx, Cy, Cz are all parallel to the wind direction. The auxiliary line Cx passes through the O-side end of the drag-type blade x with respect to a drag-type blade having a declination of 90 ° (hereinafter referred to as “drag-type blade x”). The auxiliary line Cy passes through the end on the O side of the drag-type blade (hereinafter referred to as “the drag-type blade y”) that is one behind the drag-type blade x in the rotation direction. The auxiliary line Cz is the foremost drag-type blade 24a in the blade-arranged region A that is one behind in the rotation direction with respect to the blade-arranged region A to which the drag-type blade x belongs (hereinafter referred to as “drag-type blade z”). Pass through the forefront of

The blade arrangement region A, the drag type blades 24a to 24c, and the lift type blades 25, which are set on the circular substrate 21, are contoured, dimensioned and positioned (the position includes the distance between the drag type blades 24a to 24c). The following conditions 2 and 3 are set. The following distances dx, dy, dz are the lengths in the direction of the diameter line Cq, and are the distances from the diameter line Cp to the auxiliary lines Cx, Cy, Cz, respectively.
Condition 2: dz ≦ dx
Condition 3: dx <dy

  When the condition 2 is satisfied, the blade arrangement area A to which the drag type blade x belongs is not obstructed by the blade belonging to the blade arrangement area A that is one rotation behind the blade arrangement area A. The wind W that has traveled straight is supplied.

  When the condition 3 is satisfied, the drag-type blade x is a portion existing between the auxiliary line Cx and the auxiliary line Cy in the direction of the diameter line Cq (this portion is the drag-type blade x as viewed from the drag-type blade y). Is a portion protruding toward the center of rotation O), and it is guaranteed that the wind W is applied to the protruding portion. As a result, a drag force is generated in the protruding portion of the drag-type blade x applied with the wind W, and this drag force becomes the rotational driving force of the circular substrate 21 to drive the circular substrate 21 in the rotation direction R.

  On the other hand, when the above-mentioned condition 1 is satisfied and the deflection angle of the lift-type blade 25 is 270 °, the straight line travels without being obstructed by the drag-type blades 24a to 24c belonging to the same blade arrangement region A. The wind W that has been received is received from directly opposite, and lift is generated. This lift becomes the rotational driving force of the circular substrate 21 and drives the circular substrate 21 in the rotation direction R.

  As shown in FIGS. 2 and 3, the portion of the lift-type blade 25 on the most O side is not on the circumferential line Cr, but away from the circumferential line Cr by a predetermined dimension outward in the radial direction. A predetermined gap is formed with the circumferential line Cr. Due to the presence of this gap, the lift-type blade 25 receives wind W from the front when its declination is appropriately smaller than 270 ° and generates lift, thereby increasing the rotational driving force of the circular substrate 21. .

  The operation of the rotating unit 14 will be described. As the wind W is generated, the circular substrate 21 is smoothly started (started) by the drag generated by the drag type blades 24a to 24c.

  When the deflection blades 24a to 24c have a declination in the vicinity of 90 °, the wind W is applied to the concave surface of the rear surface to generate a drag force. This drag becomes a rotational driving force of the circular substrate 21 and rotates the circular substrate 21 in the rotation direction R. Due to the presence of the lift-type blades 25, the circular substrate 21 rotates even with a weak wind, and the generator 16 can generate electric power.

  When the deflection blades 24a to 24c have a declination angle of 90 °, the structure satisfying the condition 2 does not receive the wind W over the entire rear surface side, but from the drag blades behind one to the rotation center O side. The wind W is applied only to the protruding protrusions to generate drag.

  In FIG. 2, since the wind W mainly hits the protruding portion of the drag-type blade 24a, the flow of the wind Wa hitting the protruding portion of the drag-type blade 24a is illustrated. In FIG. 3, the wind W mainly hits the protrusions of the drag-type blades 24 c with the deflection angle of 90 °, but hits the protrusions of the drag-type blades 24 b with the deflection angle slightly larger than 90 °. The flow of the wind Wb and the wind Wc hitting the protrusions of the blades 24b and 24c is illustrated.

  The wind W hitting the protrusions of the drag type blades 24a to 24c moves along the rear surface of the drag type blades 24a to 24c in the peripheral direction of the circular substrate 21, and from the end on the anti-O side of the drag type blades 24a to 24c. It is discharged out of the circular substrate 21 (refer to the wind Wa, the wind Wb, and the wind Wc in FIGS. 2 and 3), and rides on the wind W outside the circular substrate 21 and smoothly moves away from the circular substrate 21 leeward. Accordingly, the wind emitted from the drag type blades 24a to 24c is avoided from hitting the front surface of the drag type blades on the rear side and goes out of the circular substrate 21, so that the rotational driving force due to the released wind is reduced. Can be prevented.

  In each blade arrangement area A, the drag-type blades 24a to 24c have a declination angle of 90 ° in the order of arrangement in the rotation direction R. Therefore, the generation period of the drag in each blade arrangement area A, that is, the generation period of the rotational driving force Will increase. Thereby, in the whole rotation unit 14, the rotational driving force by the drag of the drag type blades 24a to 24c increases.

  If there is only one drag-type blade in each blade arrangement area A, the number of times the deflection angle of the drag-type blade is 90 ° in each blade arrangement area A is only one in each blade arrangement area A. However, in the rotating unit 14, the number of the drag type blades in the blade disposition area A is three times, and each protrusion can be set to a shape that increases the drag. Can be increased.

  The drag type blades 24a to 24c are substantially parallel to the wind direction when the declination becomes 0 °. As a result, vortices are prevented from being generated on the rotation center O side.

  On the other hand, the lift-type blade 25 increases the lift as the circular substrate 21 is started to rotate by the drag of the drag-type blades 24a to 24c and the peripheral speed of the circular substrate 21 increases. The lift force of the lift-type blades 25 is generated when the lift-type blades 25 have a declination around 270 °. With the configuration satisfying the above-described condition 1, the lift-type blade 25 is not obstructed by the previous drag-type blades 24a to 24c in the same blade disposition region A when the deflection angle is around 270 °. Sufficient lift is generated in response to the wind W. Thereby, at the time of a strong wind, the circular board | substrate 21 rotates with the peripheral speed faster than a wind speed.

  Embodiments of the present invention have been described. The rotation unit 14 is an example of a vertical axis wind turbine according to the present invention. The circular substrate 21 is an example of the rotating substrate of the present invention. The rotating substrate of the present invention may not be circular.

  The circumferential line Cr in the embodiment is an example of a circumferential line having a predetermined radius centered on the rotation center of the rotating substrate in the present invention. The “O side” and “anti-O side” in the embodiments are examples of the vertical axis side and the anti-vertical axis side in the present invention.

  In the embodiment, four blade disposition areas A are set, but the number of blade disposition areas A per rotation unit 14 may be a plurality other than 4 as long as the conditions 1 to 3 are satisfied. it can.

  In the embodiment, three drag type blades 24a to 24c are arranged in each blade arrangement area A. However, if the conditions 1 to 3 are satisfied, the number of the drag type blades in the blade arrangement area A is determined. A plurality other than 3 can be used.

  In the embodiment, the ends on the rotation center O side of the drag type blades 24a to 24c are arranged at equal intervals u along the inner arc Li, but the intervals between the drag type blades 24a to 24c are the conditions 1 to 3. If it satisfies, it does not need to be equally spaced.

  In the present invention, the configuration satisfying the condition 2 in the embodiment is that when the deflection angle of each drag type blade in the front blade disposition region is 90 ° between the blade disposition regions adjacent in the rotation direction, the front side This is an example in which the blade disposition region is set so that the drag-type blade having a declination of 90 ° and the rear blade disposition region do not overlap in the direction perpendicular to the wind direction. .

DESCRIPTION OF SYMBOLS 9 ... Vertical axis | shaft, 14 ... Rotation unit (vertical axis | shaft type windmill), 21 ... Circular board | substrate (rotation board | substrate) 24a-24c ... Drag type | mold blade | wing, 25 ... Lift type blade | wing.

Claims (2)

A vertical axis,
A rotating substrate fixed to the vertical shaft and rotating integrally with the vertical shaft;
A vertical axis type windmill comprising a plurality of blades fixed to the rotating board and receiving wind to rotate the rotating board;
The plurality of blades include lift type blades and drag type blades,
A plurality of blade arrangement regions are set on the rotating substrate at intervals in the rotating direction of the rotating substrate,
The lift-type blade and the drag-type blade are disposed in the blade disposition region so as to be on the outer side and the inner side, respectively, with respect to a circumferential line having a predetermined radius centered on the rotation center of the rotating substrate,
Only one lift type blade is disposed at the rear end in the rotation direction of the rotating substrate in each blade disposition region,
A plurality of the drag type blades are disposed at intervals in the rotational direction ahead of the lift type blades in the rotational direction of the rotational type blades in each blade disposition region,
In each blade arrangement region, the plurality of drag-type blades, the one arranged in front of the rotation direction, protrudes the end on the vertical axis side toward the vertical axis,
When the deflection angle of each blade around the rotation center is on the windward side with respect to the rotation center on the first straight line extending through the rotation center and parallel to the wind direction. Is defined as 0 ° and the rotation direction of the rotating substrate is defined as a positive direction, and the deflection angle of each drag type blade in the front blade disposition region is 90 ° between the blade disposition regions adjacent to the rotation direction. In this case, the drag-type blades having a declination of 90 ° in the front blade arrangement region and the rear blade arrangement region do not overlap in the direction perpendicular to the wind direction. The shape and dimensions of each blade are set ,
In each blade arrangement region, when a drag type blade other than the last drag type blade has a declination angle of 90 °, the drag type blade with the declination angle of 90 ° is a drag type blade one behind in the rotation direction. A plurality of protrusions in each of the blade disposition regions so as to have a protrusion that protrudes toward the vertical axis from a second straight line that passes through the end of the vertical axis and is parallel to the first straight line. The rotation direction interval of the drag type blade is set,
In each blade arrangement region, each drag-type blade is substantially parallel to the wind direction when the deflection angle becomes 0 °, and forms a flow path parallel to the wind direction on the rear side in the rotation direction. A vertical axis type windmill characterized by the shape of a drag type blade . The vertical axis wind turbine according to claim 1,
The vertical axis type windmill characterized in that the ends on the anti-vertical axis side of the plurality of drag type blades in each blade arrangement region are arranged on the circumferential line.