KR101325266B1 - blade of vertical axis windmill - Google Patents

Abstract

The present invention relates to a blade of a vertical windmill, and more particularly, to a blade of a vertical windmill that is very easy to start early by maximizing the use of drag during initial startup of the vertical windmill.
The blade of the present invention has a cross-section formed in the shape of an airfoil, the inside of which is hollow and the body having the first and second entry holes formed up and down long inwardly facing the vertical axis, and is mounted on the body to resist drag by wind. And a drag generating unit for generating the drag generating unit, wherein the drag generating unit is installed between the first and second fixing panels fixed to the upper and lower parts of the body, respectively, and the upper and lower parts are disposed between the first and second fixing panels. A wing having first and second drag targets respectively supported and slidably movable on the second fixing panel and having the curved surfaces; and the first and second drag targets according to the rotational speed of the body. It is provided with a moving portion for entering or withdrawing through the entrance hole, but the first and second drag feathers to enter or withdraw to form a curved trajectory.

Description

Blade of vertical axis windmill}

The present invention relates to a blade of a vertical windmill, and more particularly, to a blade of a vertical windmill that is very easy to start early by maximizing the use of drag during initial startup of the vertical windmill.

In general, a windmill rotates a blade by natural wind, and converts it into electrical power by rotating a generator by increasing the speed by using a gear mechanism or the like. Such windmills for wind power generation are represented by Dutch windmills, and a horizontal shaft windmill whose rotation axis is horizontal with respect to the wind, and a vertical shaft windmill whose rotation axis is perpendicular to the wind are known.

Among these, the vertical axis windmills are known as drag type that rotates the windmill by drag generated on the blade such as paddle type or savonius type, and lift type that rotates the windmill by lifting force generated on the blade such as Darius type or Gyromill type. have.

That is, the former rotates the windmill by the drag difference by reducing the resistance of the blade toward the blow-up side, while the latter rotates the windmill by the lift force generated in the blade.

In the case of the electron (drag type) of the vertical axis type, when the circumferential speed ratio (blade air foil end speed / wind speed) is 1, a moment for rotating the windmill no longer occurs, and even if the wind speed rises, even more rotational speed may be obtained. And low power generation efficiency.

In the latter case (lift type), the aerodynamic characteristics of the windmill are improved when the circumferential ratio is 1 or more, and the windmill can be efficiently rotated. In addition, there is a drawback that the starting moment is small and the starting from the stop state becomes very difficult.

Korean Patent No. 0637297 discloses a wind power generator. The disclosed wind power generator has a plurality of blades installed at a predetermined angle about the rotation axis in a plane orthogonal to a vertical rotation axis, and the blade is an air foil type having a high lift coefficient with a low Reynolds number. A cutout is formed at the trailing edge of the.

The wind power generator as described above has a problem in that the drag force in the direction of the wind is relatively weak and the drag force for driving at low wind speed is relatively low driving force at low wind speed. That is, the wind generator improves maneuverability at low speed by giving a difference between drag acting at the front and drag acting at the rear. However, this wind turbine has a problem of low efficiency due to the reduction of the blade area at high speed. .

In order to solve the above problems, Korean Patent Publication No. 2011-0088828 discloses a vertical windmill for wind power generation. The disclosed windmill is provided with a drag generating member movably installed between a first position protruding out of the blade and a second position leading into the blade. The drag generating member protrudes to the outside of the blade when the blade is stopped, and has a structure that is drawn into the blade by centrifugal force when the blade is rotated.

However, the conventional technology has a problem that the amount of reciprocating movement cannot be increased because the drag generating member reciprocates linearly in a limited blade inner space. Therefore, the protruding length of the drag generating member protruding to the outside of the blade can also be shortened, so there is a limit in increasing drag utilization during initial startup.

The present invention has been made to improve the above problems, and the drag target which is installed inside the blade to generate drag can be pulled in and pulled out along the trajectory of the curve, thereby greatly improving the drag acting on the blade during initial startup of the windmill. The object is to provide a blade of a vertical windmill that is very easy to maneuver.

In addition, an object of the present invention is to provide a blade of a vertical windmill that is easy to manufacture and easy to manage the blade by uniting a plurality of devices installed inside the blade into a unit.

In the blade of the vertical windmill of the present invention for achieving the above object is a plurality of blades of the vertical windmill is rotated by the lifting force is installed at equal intervals around the vertical axis, the blade is formed in the shape of an airfoil cross section And a drag generating unit mounted on the body and generating a drag by wind, wherein the drag generating unit is provided with a body having first and second entry holes formed up and down on an inward surface facing the vertical axis and having an empty inside. Is installed between the first and second fixing panels fixed to the upper and lower portions of the body, respectively, and the first and second fixing panels so that the upper and lower portions are supported to be slidably movable to the first and second fixing panels, respectively. Wings having a first and a second drag target and a first and a second drag target, the first and the second drag target according to the rotational speed of the body Through it characterized by comprising a movement, which take-off or incoming sikidoe incoming or withdraw the first and second collars so as to form a trajectory of a drag curved.

The moving part is installed between the first and second fixing panels, both ends of which are rotatably supported by the first and second fixing panels, and upper and lower portions of the wing parts, respectively, to be installed on the first and second fixing panels. A slider movable along a curved guide hole formed in the connector, connecting means for connecting the rotary shaft and the slider to move the slider along the guide hole when the rotary shaft rotates, and the first and second drag feathers A first rotational force providing unit providing a rotational force for rotating the rotational shaft in one direction so as to be drawn out of the body; and when the centrifugal force acts on the body, the rotational shaft is rotated in the other direction to provide the first and second drag force. And a second power supply unit for introducing a feather into the body.

The connecting means may include a first rod coupled to the rotation shaft, and a second rod one side of which is hinged to the first rod and the other side of which is hinged to the slider.

The second rotational power providing unit is rotatably coupled to the rotating shaft and has an eccentric portion protruding from one side thereof so that the weight is biased toward one side from the center of the rotating shaft, and the rotating shaft is coupled to the eccentric portion by a centrifugal force acting on the body. And a weight member for rotating.

The drag generating unit is characterized by further comprising supporting means for preventing the wing portion from moving downward by its own weight.

The support means is coupled to the interval holding member for maintaining the spacing of the first and second drag feathers and the projection portion penetrating through the guide hole formed in the first fixing panel, rotatably coupled to one side of the projection portion The first support roller which is in contact with the upper surface of the fixing panel, and rotatably coupled to the other side of the projection portion is in contact with the upper surface of the first fixing panel and on the opposite side of the first support roller with the guide hole therebetween. And a second supporting roller positioned.

As described above, the present invention enables the first and second drag targets installed inside the blade to be pulled in and pulled out by the centrifugal force, thereby greatly improving the drag acting on the blade during initial startup of the windmill, thereby making it very easy to maneuver. .

In addition, the present invention is to form a wing to the curved surface to reciprocate along the trajectory of the curved, so that the amount of reciprocating movement can be significantly increased as compared to the linear reciprocating motion in the limited blade inner space. Therefore, the protruding lengths of the first and second drag targets projecting out of the blade can be lengthened, thereby increasing drag utilization. In particular, the present invention can double the area in contact with the wind by drawing in and pulling out two drag targets simultaneously.

In addition, the present invention is integrated in the drag generating unit installed inside the blade into one integrated in the blade is easy to manufacture and easy to manage the blade.

1 is a perspective view of a vertical windmill to which a blade is applied according to an embodiment of the present invention;
Figure 2 is an exploded perspective view of the blade shown in Figure 1,
Figure 3 is a perspective view of the main portion of Figure 2,
4 and 5 are cross-sectional views showing the operating state of the blade.

Hereinafter, a blade of a vertical windmill according to a preferred embodiment of the present invention with reference to the accompanying drawings will be described in detail.

1 to 3, the blade 10 of the present invention is mounted on a vertical windmill. The vertical windmill is coupled to the rotary shaft 1, a plurality of supports 5 are radially extended by one end is coupled to the rotary shaft 1, and is coupled to the end of the support (5) at equal intervals around the vertical axis (1) It consists of a plurality of blades 10 installed as.

In the vertical windmill having the above-described structure, a lower portion of the rotating shaft 1 is connected to a power generation unit (not shown), and thus, power generation by wind power is possible. In the illustrated example, four blades 10 are arranged around the axis of rotation, but alternatively two or three blades may be arranged at equal intervals.

The blade 10 is formed in a cross-sectional streamlined airfoil shape. In general, lift type blades can rotate at high rotational speed due to better aerodynamic characteristics of windmills at high wind speeds where the main speed ratio (blade speed / wind speed) is 1 or more. The aerodynamic performance deteriorates and the moment to rotate the windmill is reduced. In addition, there is a problem that the starting moment is small, it is difficult to start in the stop state. To this end, the present invention improves the structure of the blade 10 to facilitate the maneuver by drag.

Looking specifically at the blade 10 according to an embodiment of the present invention, the blade 10 is provided with a body 11, the drag generating unit (30).

The body 11 is formed in a streamlined air foil type whose cross section is used for an airplane. The body 11 has a hollow structure with an empty inside. In the illustrated example, the body 11 consists of a main body 12, an upper cap 15 coupled to an upper portion of the main body 12, and a lower cap 17 coupled to a lower portion of the main body 12.

The main body 12 is formed by bending a thin square plate-like material made of a metal material such as aluminum alloy in a streamlined fashion. The edge of the main body 12 forming the trailing edge B is welded or bolted. Upper and lower caps 15 and 17 are coupled to upper and lower portions of the opened body 12, respectively.

The upper and lower caps 15 and 17 have a streamlined shape having the same shape as the cross section of the main body 12. In addition, a plurality of fixing pieces 16 and 18 are formed at predetermined intervals around the upper and lower caps 15 and 17. The fixing pieces 16 of the upper cap 15 are formed toward the inner side of the main body 12, that is, downward. And the fixing pieces 18 of the lower cap 17 is formed toward the inner side, that is, upward of the main body 12. These fixing pieces 16 and 18 are formed to be in close contact with the inner surface of the main body 12 when the upper and lower caps 15 and 17 are assembled to the main body 12. Each of the fixing pieces 16 and 18 is provided with fixing holes 16a and 18a to which the screw member 19 can be coupled. A plurality of through holes 20 are formed in the main body 12 so as to correspond to the fixing holes 16a and 18a. The upper cap 15 and the lower cap 17 are fixed by the screw member 19 in a state coupled to the upper and lower parts of the main body 12.

The main body 12 has first and second access holes 13 and 14 formed on the inward surface facing the vertical axis 1 vertically. The first and second access holes 13 and 14 are formed at positions adjacent to the trailing edge B rather than the leading edge A of the body 11. That is, when the distance between the leading edge A and the trailing edge B is M, it is preferable that the first and second access holes 13 and 14 are formed at a distance within M / 2 from the trailing edge B. .

The first access hole 13 is formed long in the lower direction from the top of the main body 12. The second access hole 14 is spaced apart from the first access hole 13 in the direction of the leading edge A and formed in parallel with the first access hole 13. In the illustrated example, the second access hole 14 is composed of two slits 14a and 14b which are disconnected unlike the first access hole 13. This is to prevent the strength of the main body 13 from decreasing.

And the main body 13 is provided with a coupler 20 which is coupled to the support (5) one each in the upper and lower sides. Coupler 20 is composed of a square base 23 screwed to the inward surface of the main body 12, the boss 21 is formed on the base 23, the end of the support (5) is coupled. The base 23 is formed with a through hole to which the screw member 25 is coupled, and a fixing hole is formed in the body 12 at a position corresponding to the through hole of the base 23. The screw member 25 passes through the through hole of the base 23 and the fixing hole of the main body 12 and is screwed to the fixing bracket 27 installed inside the main body 12.

The fixing bracket 27 is installed inside the main body 12 to maintain the shape of the main body 12 and at the same time serves to firmly fix the coupler 20 to the main body 12. The fixing brackets 27 are installed up and down inside the main body 12. One surface of the fixing bracket 27 is in contact with the inner surface of the main body 12 and the other surface is in contact with the inner surface of the outer surface of the main body 120 to be fixed to the main body 12 by the screw member 25.

The drag generating unit 30 is installed inside the body 11 having the above-described structure. In the present invention, the drag generating unit 30 has a structure in which a plurality of components including the wing portion 40 are integrated into one. In this way, by uniting the drag generating unit 30 integrally, the production of the blade 10 is easy and easy to manage.

Unitized drag generating unit 30 is inserted into the main body 12 and positioned and then fixed to the main body 12 with a screw member (29). Then, the upper and lower caps 15 and 17 are coupled to the upper and lower parts of the main body 12 to assemble the blade 10.

The drag generating unit 30 shown is mounted to the body 11 and generates drag by wind.

The drag generating unit 30 is installed between the first and second fixing panels 50 and 60 and the first and second fixing panels 50 and 60 respectively fixed to the upper and lower parts of the body 11. Wing portions 40 having first and second drag force elements 41 and 43 formed in a curved shape, respectively supported by the upper and lower portions so as to be slidably movable in the first and second fixing panels 50 and 60, and a first portion. And the second drag feathers 41 and 43 are drawn in or drawn out through the first and second access holes 13 and 14 according to the rotational speed of the body 11, and the first and second drag feathers 41 And a moving part for pulling in or drawing out so that the 43 forms a curved trajectory.

The first fixing panel 50 has a streamlined shape identical to the cross-sectional shape of the body 11. The first fixing panel 50 is shown in detail in FIG. 3. A curved guide hole 51 is formed in the first fixing panel 50. The guide hole 51 has the same curvature as that of the first drag feather 41 and the second drag feather 43. The lower surface of the first fixing panel 50 is provided with a lip 52 formed around the guide hole 51. The lip 52 is formed to protrude downward from the first fixing panel 50. This is to widen the contact area with the slider 80 to be described later.

A plurality of fixing pieces 53 are formed at a predetermined interval around the first fixing panel 50. Each fixing piece 53 is formed to be in close contact with the inner surface of the body 12 when assembling the blade. Each fixing piece 53 is formed with a fixing hole 54 to which the screw member 29 can be coupled. The through hole 28 is formed in the main body 12 so as to correspond to each of the fixing holes 54. The first fixing panel 50 is fixed to the main body 12 by the screw member 29 in a state located inside the main body 12.

The second fixing panel 60 is installed at a position facing the first fixing panel 50. The second fixing panel 60 has the same shape and structure as the first fixing panel 50. Accordingly, the curved guide hole 61, the lip 62, and the fixing pieces 63 are also formed in the second fixing panel 60.

The wing 40 is installed between the first and second fixing panels 50 and 60. The wing 40 is supported so that the upper and lower parts are slidably movable on the first and second fixing panels 50 and 60, respectively.

The wing portion 40 has a first drag feather 41, a second drag feather 43, a connection panel 47 connecting the first drag feather 41 and the second drag feather 43, and a first It includes a plurality of spacing member 49 is installed between the drag target 41 and the second drag target 43.

The first drag feather 41 is formed in a curved surface. The first drag feather 41 extends in the trailing direction from the edge of the rectangular connecting panel 47 and extends in a curved shape inwardly, that is, bent in the direction of the vertical axis 1.

The second drag feather 43 is formed of a curved surface having the same curvature as the first drag feather 41. The second drag feather 43 is formed with a cutting groove 44 in the center portion. This is because the second access hole 14 is composed of two slits 14a and 14b.

The vertical length of the first and second drag feathers 41 and 43 is formed to be somewhat smaller than the distance between the first panel 5 and the second panel 50. Two interference preventing grooves 45 are formed in the first and second drag feathers 41 and 43. This is to prevent the first and second drag feathers 41 and 43 from interfering with the fixing bracket 27 installed inside the body 11 when the wing 40 is moved.

The first drag feather 41, the second drag feather 43, and the connection panel 47 may be formed by bending a single thin plate-like material. As the plate material, a metal material such as aluminum alloy can be used.

The gap maintaining member 49 is to maintain a constant distance between the first and second drag feathers 41 and 43 made of a thin plate shape. The space keeping member 49 has a curved shape corresponding to the space between the first and second drag targets 41 and 43. The space maintaining member 49 is provided with a plurality. In the illustrated example, four spacing members 49 are arranged at a predetermined interval on one wing 40. The space keeping member 49 is fixed to the first and second drag feathers 41 and 43 by a screw member.

The moving part draws the first and second drag feathers 41 and 43 into or out of the body 11 according to the rotational speed of the body 11.

The moving part is installed between the first and second fixing panels 50 and 60, and both ends of the rotating shaft 70 are rotatably supported by the first and second fixing panels 50 and 60, and the wing 40 And a slider which is provided at upper and lower portions of the upper and lower portions, respectively, and which is movable along the curved guide holes 51 and 61 formed in the first and second fixing panels 50 and 60, and the slider when the rotating shaft 70 rotates. Connecting means for connecting the rotary shaft 70 and the slider so as to move along the (51) (61), and the rotary shaft so that the first and second drag targets (41) 43 can be drawn out of the body (11) A first rotational force providing unit that provides a rotational force for rotating the 70 in one direction, and when the centrifugal force acts on the body 11, the rotation shaft 70 is rotated in the other direction so as to rotate the first and second drag feathers 41 ( And a second power supply unit 100 for introducing 43 into the body 11.

The rotating shaft 70 is installed between the first fixing panel 50 and the second fixing panel 60. An upper portion of the rotation shaft 70 is rotatably coupled to the protrusion 97 installed on the first fixing panel 50. The protrusion 97 is formed to protrude upward of the first fixing panel 50. The lower portion of the rotating shaft 70 is coupled to the protrusion 97 installed on the second fixing panel 60 so as to be rotatable. The rotation shaft 70 is provided with first and second power supply units.

The slider is coupled to the spacing member 29 installed in the wing 40. In the example shown, the first and second guide rollers 80 and 83 are applied to the slider. The first guide roller 80 is rotatably coupled to the fixing pin 81 screwed to the spacing member 49. The fixing pin 81 passes through the guide hole 51 of the first fixing panel 50 and is screwed to the space keeping member 49 installed at the upper portion of the wing 40. The second guide roller 83 is also rotatably coupled to the fixing pin 84 screwed to the spacing member 49. The second guide roller 83 is installed at a position spaced apart from the first guide roller 80 in the trailing direction. The first and second guide rollers 80 and 83 coupled to the wing portion 40 by the fixing pins 81 and 84 are guides when the wing portion 40 moves in the state of being inserted into the guide hole 51. It slides along a hole 51 drawing a curve trajectory.

And although not shown, the slider is also installed in the lower portion of the wing 40 is coupled to the guide hole 61 of the second fixing panel 60, of course.

The connecting means connects the rotary shaft 70 and the slider so that the slider moves along the guide holes 51 and 61 when the rotary shaft 70 rotates.

The connecting means is installed in each of the first fixing panel 50 and the second fixing panel 60. The connecting means installed on the first fixing panel 50 has a first rod 90 coupled to the upper end of the rotating shaft 70, one side of which is hinged to the first rod 90, and the other side of the first guide roller 80. And a second rod 95 hinged.

One side of the first rod 90 is coupled to the rotation shaft 70 by a bolt 91. The first rod 90 rotates in conjunction with the rotation shaft 70. The other side of the first rod 90 is hinged by one side of the second rod 95 and the fixing pin 93. The other side of the second rod 95 is hinged to the fixing pin 81 coupled with the first guide roller 80. Although not shown, the same connecting means as the above-described structure is installed on the second fixing panel 60 to connect the lower part of the rotating shaft 70 to the slider.

The above connection means serves to convert the rotational movement of the rotary shaft 70 to the reciprocating motion of the wing 40.

The first power supply unit 100 is installed on the upper and lower portions of the rotary shaft 70, respectively. The first power supply unit 70 uses a torsion spring in the example shown. The torsion spring is supported by the support protrusion 74 formed on the eccentric portion 73 of the yoke 71, one side of which will be described later in the state coupled to the rotation shaft 70, the other side is fixed to the first fixing panel 50 It is supported by the projection 57.

The first power supply unit 100 provides a rotational force to the rotation shaft 70 in the direction in which the first and second drag targets 41 and 43 are drawn out of the body 11. Therefore, when the centrifugal force does not act on the body 11, that is, as shown in FIG. 4, the first and second drag targets 41 ( 43 maintains the maximum protruding state to the outside of the body (11).

When the centrifugal force acts on the body 11, the second rotational power supply part rotates the rotation shaft 70 in the other direction to introduce the first and second drag targets 41 and 43 into the body 11.

As an example of the second power supply unit, the yoke 71 and the eccentric portion 73 rotatably coupled to the rotation shaft 70 and protruding from one side of the center of the rotation shaft 70 by protruding from the center of the rotation shaft 70. Is coupled to the weight member 77 for rotating the rotation shaft 70 by the centrifugal force acting on the body (11). The yoke 71 is provided at the upper and lower portions of the rotating shaft, respectively. The yoke 71 is axially coupled to the rotation shaft 70. The eccentric portion 73 is formed to protrude in the direction of the trailing edge B of the body 11.

The weight member 77 is coupled to the upper and lower ends to the eccentric portion 73 of the yoke respectively installed on the upper and lower portions of the rotary shaft 70. The eccentric portion 73 and the weight member 77 are coupled by a screw member. The weight member 77 is preferably formed of a metal material having a large specific gravity.

When the centrifugal force is applied to the body 11 during the rotation of the blade 10, the weight member 77 coupled to the rotation shaft 70 generates a rotation force that tries to rotate in a counterclockwise direction about the rotation shaft 70. When the rotational speed of the blade 10 is gradually increased and the rotational force generated by the weight member 77 becomes larger than the rotational force applied by the first power supply unit 100, the rotation shaft 70 starts to rotate in the counterclockwise direction. do. As the rotating shaft 70 rotates, the connecting means pulls the slider 80 in the direction of the leading edge A, and the slider 80 constrained by the guide hole 51 moves along the trajectory of the curve. Accordingly, the wing portion 40 also moves in the leading edge direction, and the first and second drag targets 41 and 43 exposed to the outside of the body 11 are gradually introduced into the body, such as in FIG. 5. Keep it.

On the other hand, in addition to the above-described structure, the moving unit draws the first and second drag targets 41 and 43 into or out of the body 11 according to the rotational speed of the body 11 by using an electric motor. Can be withdrawn.

The drag generating unit 30 further includes support means 110 for preventing the wing portion 40 from moving downward by its own weight.

The support means 110 is coupled to the gap holding member 49 for maintaining the gap between the first and second drag feathers 41 and 43 to penetrate the guide hole 51 formed in the first fixing panel 50. The protrusion 111 and the first support roller 113 coupled to one side of the protrusion 111 to be in contact with the upper surface of the first fixing panel 50 and the other side of the protrusion 111 are rotatably coupled to the protrusion 111. And a second support roller 115 which is in contact with the top surface of the first fixing panel 50 and positioned opposite the first support roller 113 with the guide hole 51 therebetween.

The first support roller 113 and the second support roller 115 are in contact with the upper surface of the first fixing panel 50 to reciprocate in accordance with the movement of the wing portion 40 while the wing portion 40 by its own weight To prevent movement downward.

The vertical windmill to which the blade 10 of the present invention is applied has the first and the second through the first and second entry holes 13 and 14 formed on the side adjacent to the trailing edge B behind the blade 10. Drag force is generated by pulling out the two drag feathers 41 and 43 to enable starting even in a breeze (0.5 to 1.5 m / sec). When the rotational speed of the blade 10 is gradually increased, the first and second drag targets 41 and 43 are gradually introduced into the blade 10 by the centrifugal force acting on the blade 10. It is possible to prevent the rotation of the blade 10 from being hindered by the drag.

Therefore, these vertical windmills combine the advantages of drag-type windmills and lift-type windmills, which can lower the maneuvering wind speed (wind speed required for maneuvering from a stationary state) than conventional lift windmills. The rotational force in the reverse direction (2-5 m / sec) can be increased.

In addition, according to the present invention, since the wing portion 40 is curved to reciprocate along a curved trajectory, the amount of reciprocating movement can be greatly increased as compared to reciprocating linearly in the limited space of the blade 10. Therefore, the protruding lengths of the first and second drag feathers 41 and 43 protruding to the outside of the blade 10 can be increased, thereby increasing drag utilization. In particular, the present invention can double the area in contact with the wind by drawing in and out the two drag feathers 41 and 43 at the same time.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Accordingly, the true scope of protection of the present invention should be determined only by the appended claims.

10: Blade 11: Body
12: main body 15: upper cap
17: lower cap 30: drag generating unit
40: wing portion 41: first drag feather
43: second drag feather 50: first fixing panel
51: guide hole 60: second fixing panel
70: rotation axis 77: weight member

Claims (6)

In the blade of the vertical windmill, which is installed at equal intervals around the vertical axis and rotates by lift,
The blade has an airfoil shape in cross section and a body having first and second access holes formed up and down on an inward surface facing the vertical axis and being empty, and mounted on the body to generate drag by wind. Equipped with a drag generating unit,
The drag generating unit is installed between the first and second fixing panels fixed to the upper and lower parts of the body, respectively, and the first and second fixing panels so that the upper and lower parts can be slidably moved to the first and second fixing panels. A blade portion having first and second drag targets, each of which is supported and formed in a curved surface, and the first and second drag targets are introduced or drawn out through the first and second entry holes according to the rotational speed of the body. Blade of a vertical windmill, characterized in that the first and second drag feathers have a moving portion for entering or withdrawing to form a curved trajectory. According to claim 1, The moving part is provided between the first and second fixing panel and the rotating shaft which is supported so that both ends rotatably to the first and second fixing panel, and the upper and lower portions of the wing portion are respectively installed A slider movable along a curved guide hole formed in the first and second fixing panels, connecting means for connecting the rotary shaft and the slider to move the slider along the guide hole when the rotary shaft rotates, and the first And a first power supply unit providing a rotational force for rotating the rotational shaft in one direction so that the second drag feather can be drawn out of the body, and when the centrifugal force is applied to the body, the rotational shaft is rotated in the other direction to provide the rotational force. A second power supply unit for introducing first and second drag targets into the body;
The first rotational power providing unit is installed on the upper and lower portions of the rotary shaft, respectively, one side of the vertical windmill blades, characterized in that the torsion spring is supported on the second power supply and the other side is supported on the first fixing panel. According to claim 2, The connecting means is a vertical type characterized in that it comprises a first rod coupled to the rotating shaft, one side is hinged to the first rod and the other side is hinged to the slider Blade of the windmill. 3. The yoke of claim 2, wherein the second power supply unit is rotatably coupled to the rotation shaft, and the eccentric portion protrudes from one side to be biased toward one side from the center of the rotation shaft, and coupled to the eccentric portion to act on the body. And a weight member for rotating the rotating shaft by centrifugal force. delete The drag generating unit according to claim 1, further comprising supporting means for preventing the wing portion from moving downward by its own weight.
The support means is coupled to a spacing member for maintaining a gap between the first and second drag targets, a projection portion penetrating through a guide hole formed in the first fixing panel, and rotatably coupled to one side of the projection portion. The first support roller which is in contact with the upper surface of the fixing panel, and rotatably coupled to the other side of the projection portion is in contact with the upper surface of the first fixing panel and on the opposite side of the first support roller with the guide hole therebetween. Blade of the vertical type windmill, characterized in that it comprises a second supporting roller located.

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