Patent Publication Number: US-2012039712-A1

Title: Vertical axis wind turbine device

Description:
TECHNICAL FIELD 
     This invention relates to countermeasure against noise of a wind turbine device used for a wind power electric generator device, a mechanical power source, etc, especially relates to a vertical axis wind turbine which the rotation axis is in vertical direction and can rotate unrelated to direction of wind. 
     BACKGROUND ART 
     So far, many improvements have been progressed for above wind turbine device which merits is that it is not affected by direction of wind. However, practical use of that has been delayed by unstable starting characteristics. 
     However a following patent application by this patent applicant improved starting characteristics and practical use of that has progressed considerably. This wind turbine device of the patent application consists of structure which constant section and plural rotary wings of substantially formed into a U shape which is falling sidelong (hereinafter “U shape”) are fixed to a rotation axis which is supported on a base upwardly and freely for rotation, and at the leading edge of the rotor, plural partition plates which are fixed perpendicular to the leading edge of the rotor and inclined in thickness direction and curved plates are fixed between the partition—so-called slat structure, which both starting performance and high speed rotation function are enabled. And as the rotor is substantially “U shape” and a constant section, it is possible to manufacture by extrusion molding with low cost, moreover as upper and lower end of conventional vertical axis wind turbine is changed to connect to stay which is “U shape”, it prevents generation of wing tip vortex, and enables big improvement of performance. 
     PRIOR ART DOCUMENT  
     Patent Document 
     [Patent Document 1] 
     Japanese Patent Application No. 2008-192999 
     DISCLOSURE OF THE INVENTION 
     Problems to be Solved by the Invention 
     This invention is to be established under above background, and the theme of the invention is to reduce the noise generated by this wind turbine device in a condition of strong wind is blowing. 
     Means for Solving the Problems 
     The 1st means of this invention, is to provide vertical a axis wind turbine which the axis is supported on a base upwardly and freely for rotation, and the rotation axis which support plural rotors substantially “U shape”, and on the rotation axis a guide vane which section is like a wing section attached freely for rotation. This is the guide vane for changing the surrounding turbulent flow of a vertical axis into laminar flow. 
     The 2nd means of this invention is to provide a vertical axis wind turbine which equips connecting mechanism to fix the rotation angle of the guide vane and plural rotors, to fix rotation angle of the guide vane and plural rotors combine to be parallel. 
     The 3rd means of this invention is to provide a vertical axis wind turbine which equips a trailing edge fin made of elastic and soft material on the trailing edge of the above rotor. 
     The 4th means of this invention is to provide a vertical axis wind turbine which base of above wind turbine structure is fitted on a pole-like support, which is possible to slide upward and downward, and a pulley is installed on the upper portion of the pole-like support, and possible to slide above wind turbine upward and downward by pulling a wire hang on a pulley. 
     The purpose of structure of 5th means of this invention is to provide a vertical axis wind turbine which plural partition perpendicular to a leading edge of a rotor are arranged inclined to section one after the other at the leading edge of the rotor substantially “U shape” that has symmetrical wing section, and plural curved plates which form so-called slat are arranged in the wing thickness direction one after the other, form shape of the fluid inlet shorter in span direction and longer in the cord direction, form shape of the fluid outlet longer in the span direction and shorter in the thickness direction, and near by the fluid outlet an open and close plate member is installed. 
     EFFECTS OF THE INVENTION  
     The 1st effect of this invention is that by installing a guide vane which section is like a wing section shape on a rotation axis freely for rotation, possible to reduce turbulence of wind caused by the rotation axis, prevent reduction of rotor performance and generation of noise. 
     The 2nd effect of this invention is the guide vane stream to wind direction—so-called vane effect, and when wind turbine is stopped in a condition of strong wind, it enables to reduce drag minimum by fixing the direction of the chord parallel to wind direction and reduce wind noise minimum. 
     The 3rd effect of this invention is that it prevents noise—so-called wind noise, generated at the trailing edge of the rotor, and prevents resonance of the rotor by turbulence of air flow. 
     The 4th effect of this invention is that to be possible to avoid a excessive wind pressure which add to all devices including a pole-like support by pulling down base of the wind turbine to the bottom of the pole-like support where wind velocity is relatively low, and prevent damage or failure, and prevent noise generated by wind beating all the wind turbine devices that travel long distance. 
     The 5th effect of this invention is to obtain safe revolution control in a condition of strong wind is blowing by achieving extremely effective braking ability by a plate member which is possible to open and close near by the slat for starting performance, and by this restrict excessive the rotation speed, and it is possible to prevent noise generated under the above condition. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       [ FIG. 1 ] Side Section View of the 1st practiced embodiment of this invention 
       [ FIG. 2 ] A-A Section View of the 1st practiced embodiment of this invention 
       [ FIG. 3 ] B-B Section View of the 1st practiced embodiment of this invention 
       [ FIG. 4 ] Side Section View of the 2nd practiced embodiment of this invention 
       [ FIG. 5 ] Section View of the 3rd practiced embodiment of this invention 
       [ FIG. 6 ] Side Section View of the 4th practiced embodiment of this invention 
       [ FIG. 7 ] Section View of the 5th practiced embodiment of this invention 
       [ FIG. 8 ] Partial Side View of Main Shape of the 5th practiced embodiment of this invention 
       [ FIG. 9 ] Partial Side View of Main Shape of the 5th practiced embodiment of this invention 
     
    
    
     MODE FOR CARRYING OUT THE INVENTION 
     Structure of 1st means and 2nd means of this invention is a vertical axis wind turbine which a guide vane of wing section shape is supported on a rotation axis freely for rotation, preferably a guide vane is hollow structure or light weight structure made of foamed plastics, which is supported on a rotation axis with bearing, etc, that enables smooth rotation. And by installing plural above wind turbine structures in the axis direction, effects of this invention become bigger. In addition, by structure described later, the chord of the rotor and the guide vane are arranged to be able to combine at the angle of rotation parallel to wind. 
     Embodiment 1 
     The 1st embodiment of this invention in the following figures is explained as follows. 
       FIG. 1  is the side section view of the 1st practiced embodiment of this invention,  FIG. 2  is the A-A section view of this invention and  FIG. 3  is the B-B section view of this invention. 
     In  FIG. 1 , a base  1  support a rotation axis  2  freely for rotation which is vertical to horizon, a electric generator  3  is fixed to the base  1 , and the rotation axis  2  is engaged with the electric generator  3  through speed up gears  4 ,  5  which are arranged at the bottom of the rotation axis  2 . 2 hubs  7 ,  8  are fixed to the rotation axis  2 , and 2 rotors  9  and support arms  10  are fixed tightly in substantially “U shape” condition. And on outside diameter of a support pipe  11  of the rotation axis  2 , a flange member  12  is arranged freely for sliding upward and downward, and 1st Pin  13  which a penetrate hub  7  contact upper surface of the flange member  12 . 
     Between the hub  7  and  8 , a guide vane member  16  which plates  14 ,  15  are fixed at the top and the bottom end is arranged on the rotation axis  2  freely for rotation and arranged freely for sliding upward and downward. Rotation center of a guide vane  16  is located at the leading edge, and accordingly the leading edge always turns to windward—so-called vane effect. And the guide vane  16  is the lightweight hollow or internal porous structure, and the section shape is rounded leading edge and sharp trailing edge which is similar to wing section of aircraft. A spring  17  is fitted to the plate  15 , and a roller  18  is fitted to the spring  17  freely for rotation, and when it is fitted in a hollow  19  which is arranged on the lower surface of the hub  8 , it is possible to fix position of rotation when the chord of the rotor  9  and the guide vane  16  becomes parallel and the second pin  20  which is arranged in the hub  8  freely for sliding contact to the hook a plate  21  at the top of the pin  20 , hook  22  is formed on the hook plate  21 , and it fit with a hollow  23  arranged on upper surface of the hub  8 , and it fix position of rotation of the hub  8  and the hook plate  21 . In addition, the hubs  24 ,  25  are arranged on the rotation axis  2  freely for rotation, and  2  rotors  26  and support arms  27  are fixed to the hub  24 ,  25  in substantially formed into a “U shape”. The 3rd pin  28  which is arranged on the hub  24  freely to slide upward and downward is fixed to the hook plate  21  at the bottom end, and fix rotation position of the hook plate  21  and the hub  24 . Under this condition, the rotors  9  and  26  are fixed to each other by 90 degrees phase difference. Between the hub  24  and  25 , a guide vane  31  which plates  29 ,  30  are fixed at the top and bottom end is arranged on the rotation axis  2  freely for rotation and freely for sliding upward and downward. The rotation center of the guide vane  31  is located at the leading edge of it, and accordingly the leading edge of it always turns to windward—so-called vane effect. 
     And the guide vane  31  is the lightweight hollow or internal porous structure, and the section shape of the guide vane  31  is rounded leading edge and sharp trailing edge similar to wing section of aircraft. A spring  32  is fitted to the plate  30 , and a roller  33  is fitted to the spring  32  freely for rotation, and when it is fitted in a hollow  34  which is arranged on the lower surface of the hub  25 , it is possible to fix position of rotation when Chord of the rotor  26  and the guide vane  31  become parallel. 
     Dashed line in  FIG. 2  and  FIG. 3  show 90 degrees rotated from indicated position of  FIG. 1 , and if wind direction is from left to right, continuous line in  FIG. 2  shows stopped condition, and dashed line in  FIG. 3  shows stopped condition. Yet, to improve starting characteristics additional member as slat, etc are necessary for rotors  9 ,  25 , but detail is explained later. And the 1st pin  13 , the 2nd pin  20  and the 3rd pin  28  is one each in  FIG. 1 , however it is preferable to arrange plural pins at periphery of the rotary axis. 
     Operations of this invention in  FIGS. 1 ,  2 ,  3  are explained as follows. Condition in  FIG. 1  shows the rotor  9 , which is fixed to the rotary axis  2  through the hubs  7 ,  8 , is rotating by the power of wind. The rotor  26  is rotating by power of wind under the condition of the fitting hollow  23  of the hub  23  and the hook  22  of the hook plate  21 , the hook plate  21  and the 3 rd  pin  28  and the hub  24 , and rotation position fixed at phase difference 90 degrees to each other.  FIG. 2  and  FIG. 3  show this is the condition that the rotor  9  and the rotor  26  keep 90 degrees phase difference of each other. If wind the direction is from left to right, this phase 90 degrees different condition enables continuous rotation under small torque unevenness. 
     By lifting upward the flange member  12  which is arranged freely to slide upward and downward on outside diameter of the support pipe, using lever which is not shown in the figure, the 1st pin  13  push the plate  14  from the bottom through the hub  7 , and move the guide vane  16  upward. 
     By this movement, the roller  18  located on the plate  15  once touch the lower surface of the hub  8  by the operation of the spring  17 , rotate and fit in the hollow  19  arranged on the lower surface of the hub  19 , the hub  8  and the guide vane  16  are unified and rotate around the rotation axis  2 . In addition to it, the 2nd pin  20  push up the plate  21  at the top of it and release fitting of the hook  22  of the hook plate  2  and the hollow  23  arrange on the upper surface of the hub  8 , and simultaneously move the 3rd pin upward through the hub  24 , move the guide vane upward through the plate  29  which touch it. 
     The roller  33  arranged on the plate  30  moved with the guide vane once touch the lower surface of the hub  25  and rotate, and fit with the hollow  34  arranged on the lower surface of the hub  25 , and as rotation position is fixed to each other, the guide vane  31  and the rotor  26  are unified and rotate around the rotation axis  2 . However as described above, the rotation phase of the rotor  9  and the rotor  26  is released, rotation torque becomes small when wing direction and cord of the rotors  9  and  26  become parallel. 
     While the guide vane  16 ,  31  become most stable condition when leading edge turn to windward and streaming in wind. Accordingly the rotors  9 ,  26  and guide vane  16 ,  31  stop in above condition. In this condition, all cord of rotor  9 ,  26  and the guide vane  16 , 31  are parallel to the wing direction and overall drag of wind turbine is minimum condition, and it is possible to keep safety under strong wind at maximum level, moreover as turbulence of wind become small it is possible to keep noise at minimum level. And detail explanation regarding aerodynamic brake mechanism to keep this condition is described afterward. 
     When the flange  12  moves downward, the guide vane  16 ,  31  move downward by the weight of them and recover to original condition. Effect of noise reduction with and without this guide vane  16 ,  31  varies big by wind speed. 
     And abnormal intermittent noise caused by vibration noise which leeward wing generate when wind turbine is rotating including resonance generated by cord of rotor which is not parallel to wind direction when wind turbine is stopped, achieve noise reduction effect by more than 6 decibels when wind speed is more than 15 m/second. 
     Embodiment 2 
       FIG. 4  is the Side Section View of the 2nd embodiment of this invention. Indication of symmetrical part is abbreviated. 
     In  FIG. 4 , a rotation axis  42  which is vertical to horizon is supported by a base  41  freely for rotation, and a electric generator  43  is fixed to the base  41 , and connected to the rotation axis  42  through a speed up gears  44 ,  45  which are lower end of the rotation axis  43 . And it is preferable that the base  41  is supported by a pole-like support  46  freely for sliding upward and downward if necessary, however as it is not related to the theme of this invention, detail explanation is abbreviated. 2 hubs  47 ,  48  are fixed to the rotation axis  42 , and 2 rotors  49  and a support arms  50  are fixed to the rotation axis  42  in substantially “U shape” condition. 
     And, on outer diameter of the support pipe  51  of the rotation axis  42 , a flange  52 , which is arranged freely to slide upward and downward, and the 1st pin  53  touch upper surface of the flange  52  through the hub  47 . Hubs  54 ,  55  are arranged between the hubs  47 ,  48  freely for rotation, and the 2 rotors and support a arm  57  are fixed to the hub  54 ,  55  in substantially “U shape” condition. A rotor  56  and the support arm  57  which are substantially “U shape” is a little smaller than “U shape” composed of the rotor  49  and the support arm  50 , and it is possible to turn around the rotation axis  42  without interference to each other. Between the hub  47  and the hub  54 , a hook plate  58  is arranged to touch top of the 1st pin  53 , and the hook  59 , which is arranged on the edge of the hook plate  58 , fit in a hollow  60  of the hub  47 . In addition, a 2nd pin  61  which is fixed to the hook plate  58  and arranged to be able to slide freely upward and downward through the hub  54  is arranged. 
     Between the hub  54  and  55 , a guide vane  64  that plates  62 ,  63  are fixed at top and bottom end is arranged on the rotation axis  42  freely for rotation, and freely for sliding upward and downward. The rotation center of the guide vane  64  is located at the leading edge of it, and accordingly leading edge of it always turns to windward—so-called vane effect. The rotation center of the guide vane  64  is located at the leading edge, and accordingly leading edge always turns to windward—so-called vane effect. And the guide vane  64  is the lightweight hollow or internal porous structure, and section shape of it is rounded leading edge and sharp trailing edge which is similar to wing section of aircraft. A spring  65  is fitted to the plate  63 , and a roller  66  is fitted to the spring  65  freely for rotation, and when it is fitted in a hollow  67  which is arranged on the lower surface of the hub  8 , it is possible to fix position of rotation when it is fitted to hollow  67  arranged in lower surface of the hub  55 . And the 3rd pin  68  which touch to upper surface of the plate  63  is arranged to slide freely for sliding through the hub  55  and touch to lower surface of a plate  69 . A spring  70  is fitted to the plate  69 , and a roller  71  is fitted to the spring  70  freely for rotation, and when it is fitted in a hollow  72  which is arranged on the lower surface of the hub  48 , it is possible to fix position of rotation when it is fitted to a hollow  72  arranged in the lower surface of hub  48 . When the hollow  60  of the hub  47  and the hook  59  is fitted, phase difference of the rotor  49  and  59  is 90 degrees to each other, but when the hollow  72  of the hub  48  and the roller  71  is fitted, the rotor  49  and  56  is parallel to each other. In this condition, the roller  66  arranged on the plate  63  fit to the hollow  67  arranged on the lower surface of the hub  55 , and the guide vane  64  and the rotor  49  and  56  are parallel. The 1st pin  53 , the 2nd pin  61  and 3rd pin is 1 each in  FIG. 4 , however it is more desirable to arrange plural pins at periphery of the rotation axis  42 . 
     The operation of second embodiment shown in  FIG. 4  is almost same as first embodiment shown in  FIGS. 1 ,  2 , and  3 . Condition in  FIG. 4  shows the rotor  49 , which is fixed to the rotary axis  42  through the hub  47 ,  48  is rotating by the power of wind. The rotor  56  which keep 90 degrees phase difference by the hollow  60  of the hub  47  and the hook  59  of the hook plate  58 , and the 2nd pin  61  which is set on the hook plate  58  and arranged freely for sliding upward and downward through the hub  54 , rotate supplementing mutual uneven torque. There is no restriction of rotation for the guide vane  64 , which stops rotation and is streaming in the wind. 
     When the flange member  52  move upward by the outside operation, the  1 st pin  53  push up the hook plate  58 , the hook  59  is detached from the hollow  60  and the angle relation of the rotor  49  and the  56  is released. 
     At the same time, the 2nd pin  61  push the lower surface of the plate  62  and push up the guide vane  64  and the roller  66  fit the hollow of  67  on the lower surface of the hub  55 , then the guide vane  64  would like to rotate with the rotor  56 , however by big straightening pressure of wind the guide vane  64  stops streaming in wind. The rotor  49  which was rotating by inertia of it become parallel to the rotor  56  when the roller  71  fit the hollow  72  of the hub  48 , finally the cords of the rotor  49  and  56  and the guide vane member  64  become parallel and stop streaming in wind. When the flange  52  move downward, recover to original condition by the weight of the guide vane  64 . 
     Operation of this invention is described in above; substantial effect is that straightening effect of the guide vane  16 ,  30 ,  64  contribute to improvement of wind turbine performance very much. Specifically, rotation axis of conventional wind turbine stand upright in wind and section is circle, and Karman&#39;s vortex or big vortex is generated in slip stream, and when rotor pass this turbulent slip stream zone, big vibration will occur and aerodynamic performance is reduced and it become cause of noise, moreover it will affect durability of rotor and overall of wind turbine very much. As for this problem, it is said that it is the big demerit of down window type horizontal axis wind turbine, and study of the countermeasure has been continued for long time, but there has been no effective solution yet. Thick pole-like support is necessary for horizontal axis wind turbine which heavy electric power generator is installed at center of rotation, practice method difficult but effect is big if it is possible. In this connection, coefficient of drag (C d) of circle section is about 1.0 and coefficient of drag (C d) of wing section is 0.01, the ratio is 1/100. Accordingly it is understandable that guide vane member affects to improvement of performance and noise reduction effect very much. 
     Embodiment 3 
     Structure of the 3rd means of this invention is to provide a wind turbine device which equip with a trailing edge fin made of elastic and soft material on the trailing edge of the rotor which section is similar to wing of aircraft. A rotor itself is same as conventional structure, but a fixing point of the trailing edge fin does not form sharp edge. An elastic trailing fin installed on the trailing edge is formed of soft synthetic rubber, and fitted in a rotor and fixed by known technology as adhesion. A hollow structure is acceptable to increase flexibility. 
     The 3rd embodiment of above invention in the figure is explained as follows. 
       FIG. 5  is the section drawing which shows structure of 3rd embodiment of this invention. 
     In  FIG. 5 ,  101  is the section of the rotor of wind turbine of this invention, which is similar to wing section of aircraft and made of hard plastics or metal, and a flexible and soft trailing fin  102  is arranged on the trailing edge of it. A groove  103  is arranged at the trailing edge of the rotor  101 , and a projection  104  is formed at the front edge of the trailing edge fin  102 , by inserting a bar which is not shown in the drawing into hole of the projections  104 , it is possible to combine the rotor  101  and the trailing edge  102  securely. The keystone of this invention is not limited to this fixing method. 
     Operation of this invention is explained in  FIG. 5 . The rotor  101  is rotating in wind receive wind from the leading edge, and as shape of the leading edge is roundly shape in a big radius and smooth shape, airflow is not disturbed. However, when airflow move toward trailing edge direction, boundary layer become thicker and a element of turbulence is developed. Especially at the trailing edge, strong air force is added as it is generally sharp edge. 
     Similar theory of blowing reed of musical instrument, sometimes-big sound is generated. Theory of this invention is to prevent generation of sound by changing reed part to elastic material like rubber. And low frequency vibration is generated at trailing edge, and sometime it is transmitted to blade and noise is generated by resonance of the rotor  101 , but it is possible to prevent vibration of the rotor  101  as this vibration is damped when it passes flexible and soft trailing edge  102 . As for the grade of softness, it relates to material to form wing and section shape, and it is not necessary to be too soft. By this effect, it is possible to reduce noise generated by wind turbine device very much. Especially as in many cases wind turbine is used at big angle of attack, this characteristics is important, and it is confirmed in the test that noise reduction level is more than 4 decibels at wind speed 15 m/s and angle of attack more than 15 degrees. 
     Embodiment 4 
     The fourth means of this invention is to provide wind turbine which base with vertical rotation axis is fitted on pole-like support, which is possible to slide upward, and downward, pulley is installed on the upper portion of the pole-like support, and possible to slide above wind turbine base upward and downward by pulling wire hang on the pulley. In case of normal operation, use wind turbine which is pulled up to high position of pole-like support, and in a condition of extreme strong wind is blowing, down the wind turbine to the bottom of pole-like support, then it is possible to reduce influence of wind noise spreading from high position to wide range. 
     Generally wind speed is high at high position, and wind speed is low at low position. It is well known that small increase of wind speed cause big increase of noise. And noise source located at high position spread wide range. Noise reduction effect of this invention is if small wind turbine, there is no noise detectable at 10 meter from wind turbine. Moreover it is possible to prevent damage of wind turbine by wind and thunder. 
     Of course, in this case rotor is not able to rotate for interference with pole-like support, it is necessary to stop rotation of wind turbine by brake device, etc. And as it is possible to pull down wind turbine to lower position, regular maintenance and inspection are possible to do safely and very efficiently. Section of pole-like support is a circle either a square, both acceptable, however in case of circle it is desirable to prepare stopper mechanism not to rotate suddenly. 
     And above wind turbine device which use chain for above pull wire and arrange chain block at the lower part of pole-like support, it is possible to lift and down weight of wind turbine very easily without big force. Usually weight of small wind turbine including electric generator is several decades kilograms, and difficult to lift and down it only by hand operation. However if you use chain block it is possible to do by hand operation easily. Moreover it is needless to say that in case of big wind turbine, electric strong power device is acceptable. In case of wind turbine on the ocean or other which need maintenance operation at high place is dangerous, and substantial effect of this invention for wind turbine is very big. 
     Fourth means of embodiment of above invention in the figure is explained as follows. 
       FIG. 6  is the side section drawing, which shows 4th embodiment of this invention. Partially, section drawing, which shows section shape of member, is inserted, and well-known part which do not affect keystone of this invention is simplified and indicated. 
     In  FIG. 6 , a wind turbine  202  which vertical rotation axis  201  and extrusion member which shape is wing section of aircraft is arranged, comprise of rest shape wing perpendicular to each other, a pole-like support  205  fit to hole  204  arranged on a base  203  freely for sliding upward and downward, pulleys  206 ,  207  are arranged at the upper position of the pole-like support  205 , a pull wire  208  which is hung on the pulleys  206 , 207  is guided through a small hole  209  downward through the base  203 . 
     In the case of very small wind turbine, it is possible to lift and down the wind turbine  202  by pulling the pull wire  208  manually in above condition, it is desirable to use a chain for the pull wire  208 , a chain block  210  is arranged at the lower position of the pole-like support  205 , and connect to the pull wire  208  to be able to wind. At the lower surface of base  203 , a cable  211  from for a electric power generator and a pull wire for control  212  are pulled out. It is possible to use the cable  211  for electromagnetic brake against rotation of wind turbine by short circuit. 
     If rotation becomes sufficiently slow, there is no possibility of damage when the base  203  is pulled down and wind turbine contacted with the pole-like support  205 , but for safety, a cushion  213  is fixed on the top of the pole-like support  205  to absorb impact by collision. It is preferable that shape of the cushion  213  is like arch which straddle the pulleys  206 ,  207 , however it is not limited to this shape. By pulling the pull wire for control  212 , rotate a lever  215  which is arranged in the base  203  freely for rotation by a shaft  214 , and it is possible to fix to the base  203  with the pole-like support  205  by a pad  216  which is fixed to the other end of the lever  215  and made of elastic material-rubber, etc, contact to the pole-like support  216  strongly. To pull down the base  203 , loosen the pull wire for control  212 , and it becomes possible to down wind turbine by chain block  210 . 
     In normal operation, use wind turbine, which is lifted, at high position of the pole-like support  205 , and in a condition of extremely strong wind is blowing, pull down wind turbine to bottom of the pole-like support  205  to reduce influence of noise generated by wind beating the wind turbine devices at the high position of the pole-like support that travel long distance. Moreover, it is possible to prevent damage of the wind turbine from strong wind and thunder by this function. in this case, the wind turbine is not be able to rotate as it interfere with the pole-like support  205 , it is necessary to slow down or stop rotation of the wind turbine by mechanical or air brake mechanism. And as it is possible to pull down the wind turbine to lower position, regular maintenance and inspection are possible to do safely and easily and very efficiently. 
     Section of the pole-like support is a circle either a square, both acceptable, however in case of a circle it is desirable to prepare a stopper mechanism not to rotate in an unprepared situation. 
     And above wind turbine device which use a chain for above the pull wire  208  and a arrange chain block at the lower part of the pole-like support  205 , it is possible to lift and down weight of wind turbine  202  very easily without big force. Usually weight of small wind turbine including electricity generator is several decades kilograms, and difficult to lift and down it only by hand operation. However if you use the chain block  210 , it is possible to do by hand operation easily. 
     Detail of power for chain block was not described vet, however it is needless to say that in case of big wind turbine, electric strong power device is acceptable. In a case of wind turbine on the ocean or other which need maintenance operation at high place is dangerous, and this invention improves safety of operation even in a case of maintenance extremely. 
     Embodiment 5 
     The purpose of structure of  5 th means of this invention is to provide vertical axis wind turbine which plural partition perpendicular to leading edge are arranged inclined to section one after the other at leading edge of rotor, and plural curved plates are arranged, so-called slats are installed in a wing thickness direction one after the other, arrange the fluid inlet which shape is shorter in the span direction and longer in the cord direction, and the fluid outlets which shape is longer in the span direction and shorter in the wing thickness direction, arrange panel member which open and close plate near the fluid outlet. By opening this plate member, it is possible to limit effect of slat and achieve very effective braking performance, and by stopping safely when strong wind is blowing, it is possible to prevent excessive rotation speed and accompanied generation of noise. 
     The 5th embodiment of this invention is explained in the drawing as follows. 
       FIG. 7  is the side view, which shows structure of the 5th embodiment of this invention,  FIG. 8  is a partial side view which shows shape of main part,  FIG. 9  is the partial front view which shows shape of main part,  FIG. 10  partial section view which shows shape of main part. 
     In  FIG. 7 , two units which two rotors  302  substantially “U shape” are arranged symmetrically are fixed to a rotor  301  by 90 degrees phase difference to each other. As shown in  FIG. 8 , FIG.  9 ,  FIG. 10 , the main part  303  of the rotor  302  has symmetrical wing section, plural partition  305  perpendicular to leading edge  304  are arranged inclined to section one after the other at leading edge  304  of the rotor  302 , and plural curved plates  306 ′,  306 ″ are arranged, so-called slats are installed in the wing thickness direction one after the other, arrange fluid inlets  307 ′,  307 ″ which shape is shorter in span direction S 1  and longer in cord direction H 1 , and fluid outlets  308 ′,  308 ″ which shape is longer in span direction S 2  and shorter in the wing thickness direction. Arrange the plate member  310  supported by axis  309 ′,  309  which is parallel in the span direction of the rotors  302  near by the fluid outlet  308 ′,  308 , levers  311 ′,  311 ″ are fixed to axis  309 ′,  309 ″ in the rotor  302 . Moreover, rods  312 ′,  312 ″ are fixed to a crank  313  at the top of lever  311 ′,  311 ″, and a crank  313  is supported by axis  314  freely for rotation in main part  303  of rotor  302 . A weight  316  rotates the crank  313  in counter-clockwise direction. Then rods  312 ′,  312 ″ move in left direction and open the plate member  310 ′,  310 ″. is possible to set fixing angle of the weight  315  not to close the plate member  310 ′,  310 ″ which once opened until rotation speed of rotor is reduced and centrifugal force is reduced to certain level. The axis  301  is connected to electric generator, etc which is not shown in the figure. 
     Operation of this invention is explained in  FIG. 10 . 
     Flow lines  317 ′,  317 ″ in  FIG. 10  show flow line when panel members  310 ′,  310 ″ are closed state, and flow lines  318 ′,  318 ″ show flow line when panel members  310 ′,  310 ″ are open state. When the panel member  310 ′,  310 ″ are closed state, air flow along to the curved plate  306 ′,  306 ″ which form slat generate big lift, and give turning force to wind turbine device, however when the panel member  310 ′,  310 ″ are open state, air flow is not be able to flow along to the curved panel  306 ′,  306 ″ as fluid outlet is closed, and big drag is generated as air flow is separated from wing surface. 
     Accordingly, turning force of the wind turbine device is lost, and it is possible to stop rotation by relatively small load when strong wind is blowing. By this effect, it is possible to stop wind turbine device safely when strong wind is blowing. In this case, the purpose of the panel member  310 ′,  310 ″ is to close the fluid outlet  308 ′, 308 ″, and not to cause turbulence of air flow simply. Accordingly, this operation does not generate noise, contrarily noise reduction effect caused by reduction of rotation speed is big. 
     Here, the open and close mechanism of the panel member to utilize centrifugal force when the rotation speed reached to excessive level is explained, however electromagnetic force, air pressure or hydraulics operation from outside is possible. However this invention does not limit this open and close mechanism. 
     INDUSTRIAL APPLICABILITY 
     As clarified in the above explanation, the vertical axis wind turbine of this invention reduce the turbulence of the slip stream caused by the rotary axis and improve the performance of this vertical axis wind turbine, moreover when strong wind is blowing it is possible to down it to bottom of the pole-like support, and the rotation speed control of the wind turbine is easy by simple mechanism to open and close the panel member, vibration and noise reduction effect of it is very big, improve safety and easiness of maintenance and inspection, and total effect of this invention is extremely big. 
     DESCRIPTION OF REFERENCE NUMERALS 
     
         
           2 ,  42 : rotary axis 
           9 ,  26 ,  49 ,  56 : rotor 
           16 ,  31 ,  64 : guide vane 
           101 : rotor 
           102 : trailing edge fin 
           201 : rotary axis 
           203 : base 
           205 : pole-like support 
           207 : pulley 
           302 : rotor 
           305 : partition 
           306 ′,  306 ″: curved plate 
           307 ′,  307 ″: fluid inlet 
           308 ′,  308 ″: fluid outlet 
           310 ′,  310 ″: plate member 
           311 ′,  311 ″: lever 
           312 ′,  312 ″: rod 
           313 : crank 
           314 : axis 
           315 : Spring 
           316 : weight