Abstract:
The present invention relates to a variable windmill wing wind power generator having a power generation efficiency increasing means, which includes: an installation unit; a vertical rotating shaft; a bearing; ‘[’-shaped holders; a plurality of inner wing installation units; support rods; a plurality of outer wing installation units; support rings; vertical support rods; support bars; a plurality of diagonal support bars connected between the upper and lower outer wing installation units within the same group; ladders; windmill wings; support units; a power generating means; a windmill wing fixing means; and a fixing means driving device. According to the present invention, the wind power generator can fold the windmill wings in the wind receiving direction and unfold the windmill wings when they are rotated by 180° from the wind receiving direction so as to minimize a resistance force exerted on a rotary force of a windmill shaft, thus increasing the power generation efficiency. The wind power generator according to the present invention can simplify the manufacturing process by the simple structure and be installed in a plural number in various places regardless of the installation location, thus maximizing the amount of power generation per unit area, achieving the industrial purpose, and generating electricity in the environment-friendly fashion without causing pollution such as greenhouse gas. Also, the wind power generator according to the present invention can be installed in strong as a group with up/down multi-stages, stop easily the rotation operation of the windmill wings according to need, and reach easily a troubleshooter at the position of corresponding windmill wing which needs to repair, thus performing a follow-up control of maintenance conveniently.

Description:
REFERENCE TO RELATED APPLICATIONS 
       [0001]    This application is based on Korean Application No. 10-2010-0074721 filed on Aug. 2, 2010, the contents of which are hereby incorporated herein by reference. 
       FIELD OF THE INVENTION 
       [0002]    The present invention relates to a variable windmill wing wind power generator, and more particularly to, a variable windmill wing wind power generator having a power generation efficiency increasing means which can unfold the windmill wings in the wind receiving direction and unfold the windmill wings at 180° rotation direction from the wind receiving direction so as to minimize the air resistance applied to the windmill wings when rotating, thus increasing the power generation efficiency, and which can be easily installed in a plural number even in a narrow space regardless of the installation location, thus maximizing the amount of power generation per unit area and achieving the industrial purpose. 
       BACKGROUND OF THE INVENTION 
       [0003]    In general, the recent power generation methods include heat power generation using a large amount of fossil fuels, nuclear power generation using uranium, water power generation using a large-scaled desalination equipment, and so on. As such power generation methods are responsible for the air pollution or global warming, generate radioactive wastes difficult to dispose of, or cause huge environmental destruction, environment-friendly power generation methods demand immediate attention. Research has been actively made on solar power generation and wind power generation which are alternative environment-friendly methods. In particular, the wind power generation using the wind force has been most preferred. More attention needs to be paid to the wind power generation in Korea surrounded by the sea on three sides. 
         [0004]    The wind power generation uses the force of wind and is a technique that a rotor is rotated using aerodynamic characteristics of kinetic energy due to floating of air and the kinetic energy is changed into mechanical energy, thus obtaining power. The wind power generator is classified with horizontal type and vertical type according to the direction of a rotation shaft to the ground and constructed by a rotator comprising wings and a hub, a speed increasing device for increasing the rotation of the rotor in order to drive a power generator, a control device for controlling the power generator and various safety devices, a hydraulic brake, a power controller, and a steel tower, as main components. 
         [0005]    Also, the wind power generation almost never affect environment since it uses the pollution-free and unlimited wind which is scatted everywhere, can use effectively a country, and is a new energy generation technology with a level that can compete with the existing generation method in generation price in case of a large-scaled generation site. 
         [0006]    A windmill in the wind power generator changes the kinetic energy rotated by wind into electric energy. At this time, in the windmill, about 60% of kinetic energy of the wind is changed into mechanical energy theoretically and then the mechanical energy is also changed into electric energy again, so that much energy is consumed in these processes. Accordingly, the change efficiency that wind energy is changed into electric energy has barely reached substantially about 20˜30%, although there are some differences to a great or small extent according to a shape of the windmill. 
         [0007]    In the meantime, as described above, in the convention wind power generation, there is a problem that only when the wind is maintained over a constant speed and the air density is high, kinetic energy of the wind is delivered to wings and then the windmill is rotated, thereby changing the kinetic energy of the wind into electric energy. That is, if the wind is weak or when the gentle wind rises, the rotation of the windmill becomes weak, so the wind power generation is impossible. 
         [0008]    Especially, in the conventional wind power generator, when wings of the windmill are rotated by 180 degrees from the wind receiving direction, the rotation of the windmill is blocked due to the resistance of wind or air and thus the power generation efficiency decreased. 
         [0009]    In order to solve the foregoing problems, Korean Patent Publication No. 10-2009-56280 titled by “Windmill for wind power generator with variable type wings” has been disclosed in the Korean Patent Publication Gazette. 
         [0010]    According to the Korean Patent Publication No. 10-2009-56280 titled by “Windmill for wind power generator with variable type wings”, as illustrated in  FIG. 1 , the windmill for wind power generator with variable type wings includes a case  110  coupled to a rotor rotating shaft of the power generator and then rotated together; wings  120  installed with a constant interval along circumferential longitudinal directions of the case  110  in order to be rotated the case  110  by wind, and folded and unfolded by the force of wind; a bracket  13  installed to the case  110  including the wings  120  rotatably installed through a hinge H and a driving member  130  for pivoting the wings  120  which are easily folded and unfolded according to the wind receiving direction; a cylinder  133  installed at the bracket  131  and having an operating space  133   a  formed at the inside thereof; a piston  135  built in the operating space  133   a  and moved by a linear motion; a tension spring  137  built in the operating space  133   a  in which the piston  135  is elastically supported to the direction of the wings  120 ; and a link  139  in which an end thereof is connected to the wings  120  and the other end thereof is connected to the piston  135 , wherein when the front surface  121  of the wing  120  which has been unfolded is faced with the wind blowing direction by the rotation of the windmill, the wing  120  is unfolded, and when the rear surface  123  of the wing  120  is faced with the wind blowing direction, the wing  120  is pivoted and folded rapidly from the bracket  131  by the wind force and elasticity of the tension spring  127 , so that the wind force transmitted to the wing  120  is lowered and so the rotation force of the windmill  100  is increased. 
         [0011]    However, the Korean Patent Publication No. 10-2009-56280 titled by “Windmill for wind power generator with variable type wings” has several disadvantages: although the wings  120  are folded or unfolded by the blowing wind, the wings  120  are moved by 90 degrees and then folded and unfolded and this has caused the cases that the wings are not folded or unfolded well, as well as the increase of the power generation efficiency did not meet the expectations because an elastic force of the tension spring  137  for folding and unfolding the wings acts on as a force that blocks rotation of the windmill  100 . 
         [0012]    Also, the Korean Patent Publication No. 10-2009-56280 titled by “Windmill for wind power generator with variable type wings” has a disadvantage: it is difficult to perform a maintenance because it is not equipped with a means for repairing a breakdown separately. That is, when any one among plural wings does not work due to a breakdown, the windmill  100  is rotated by wind, so it is difficult to repair the broken wing after stopping the windmill  100 . 
         [0013]    Also, there is a problem: the conventional wind power generator performs the power generation by rotating a turbine regardless of the strength of wind and so although the wind is really strong, the amount of power generation cannot be increased. 
         [0014]    Therefore, the present invention has been made to solve various shortcomings and problems associated with the conventional general wind power generator, and an object of the present invention is to provide a variable windmill wing wind power generator having a power generation efficiency increasing means which can operate by a gentle wind having a low velocity regardless of the direction of the wind and increase the number of turbines for performing power generation according to the strength of wind. 
         [0015]    Another object of the present invention is to provide a variable windmill wing wind power generator having a power generation efficiency increasing means which can fold the windmill wings in the wind receiving direction and unfold the windmill wings when they are rotated by 180° from the wind receiving direction so as to minimize a resistance force exerted on a rotary force of a windmill shaft, thus increasing the power generation efficiency. 
         [0016]    A further object of the present invention is to provide a variable windmill wing wind power generator having a power generation efficiency increasing means which can simplify the manufacturing process by the simple structure and be installed in a plural number in various places regardless of the installation location, thus maximizing the amount of power generation per unit area, achieving the industrial purpose, and generating electricity in the environment-friendly fashion without causing pollution such as greenhouse gas. 
         [0017]    A further object of the present invention is to provide a variable windmill wing wind power generator having a power generation efficiency increasing means which can be installed in strong as a group with up/down multi-stages, stop easily the rotation operation of the windmill wings according to need, and reach easily a troubleshooter at the position of corresponding windmill wing which needs to repair, thus performing a follow-up control of maintenance conveniently. 
       SUMMARY OF THE INVENTION 
       [0018]    According to an aspect of the present invention for achieving the above objects of the present invention, there is provided a variable windmill wing wind power generator having a power generation increasing means, which includes: an installation mount stood on the floor in the shape of a cross and having a vertical rotating shaft holder in a central portion thereof; a vertical rotating shaft rotatably installed uprightly in the central portion of the installation mount; a bearing into which a top end of the vertical rotating shaft is rotatably inserted; holders connected and fixed between the bearing and the installation mount; a plurality of inner wing installation units fixedly installed on the vertical rotating shaft at given intervals in the up/down direction; support rods having one-side ends fixed to the inner wing installation units; a plurality of outer wing installation units to which outer ends of the support rods are fixed; support rings made of a steel wire and connected to the outer wing installation units on the same plane; vertical support rods made of a steel wire and connecting the outer wing installation units of the same group in the up/down direction, the upper and lower outer wing installation units being grouped in the up/down multi-stage fashion; a plurality of support bars made of a steel wire and connected between the highest support rod and the lowest support rod within the same group; a plurality of diagonal support bars connected and fixed between upper and lower outer wing installation units within the same group; a ladder fixed to the support rod of each stage; windmill wings installed between the inner wing installation units and the outer wing installation units in the up/down multi-stage fashion; support units installed on the vertical rotating shaft between the groups of the windmill wings made in the up/down multi-stage fashion, and connected to the holders through wires; windmill wing fixing means installed on the vertical rotating shaft above the inner wing installation units to be movable in the up/down direction and fixing displacements of the windmill wings; fixing means driving device installed on the bottom end side of the vertical rotating shaft; a power generation increasing means installed at the lower center portion of the installation mount so as to be changed the number of power generation turbines according to the strength of wind; and a plurality of power generation means installed on the bottom portion of the power generation increasing means and for performing power generation. 
         [0019]    According to the present invention, the variable windmill wing wind power generator having a power generation increasing means can operate by a gentle wind having a low velocity regardless of the direction of the wind and drive a plurality of turbines according to the strength of wind, thus increasing the power generation efficiency. In addition, the variable windmill wing wind power generator having a power generation increasing means can fold the windmill wings in the wind receiving direction and unfold the windmill wings when they are rotated by 180° from the wind receiving direction so as to minimize a resistance force exerted on a rotary force of a windmill shaft, thus increasing the power generation efficiency. Moreover, the variable windmill wing wind power generator having a power generation increasing means can simplify the manufacturing process by the simple structure and be installed in a plural number in various places regardless of the installation location, thus maximizing the amount of power generation per unit area, achieving the industrial purpose, and generating electricity in the environment-friendly fashion without causing pollution such as greenhouse gas. Also, the variable windmill wing wind power generator having a power generation increasing means can be installed in strong as a group with up/down multi-stages, stop easily the rotation operation of the windmill wings according to need, and reach easily a troubleshooter at the position of corresponding windmill wing which needs to repair, thus performing a follow-up control of maintenance conveniently. 
         [0020]    Hereinafter, a variable windmill wing wind power generator having a power generation increasing means according to preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0021]      FIG. 1  is a perspective view illustrating a construction of a windmill for a conventional wind power generator having variable wings; 
           [0022]      FIG. 2  is a cross-sectional view illustrating a construction of wings and a driving member installed at a windmill for a conventional wind power generator having variable wings; 
           [0023]      FIG. 3  is a perspective view of a variable windmill wing wind power generator having a power generation efficiency increasing means according to the present invention; 
           [0024]      FIG. 4   a  is a perspective view illustrating an installation state of the windmill wings according to the present invention which are rotated in the clockwise direction; 
           [0025]      FIG. 4   b  is a perspective view illustrating an installation state of the windmill wings according to the present invention which are rotated in the counterclockwise direction; 
           [0026]      FIG. 5  is a view illustrating a construction of a support bar connected and installed in the same plane within the same group according to the present invention; 
           [0027]      FIG. 6  is an exploded view of major parts of a variable windmill wing wind power generator having a power generation efficiency increasing means according to the present invention; 
           [0028]      FIG. 7   a  is a perspective view of an inner wing installation unit and a moving unit according to another embodiment of the present invention; 
           [0029]      FIG. 7   b  is a view of a multi-stage arrangement state of inner wing installation units and moving units in each group of the windmill wings according to the present invention; 
           [0030]      FIG. 8  is a perspective view of a power generation efficiency increasing means according to the present invention; 
           [0031]      FIGS. 9   a  to  9   c  are plan views illustrating a gear arrangement state of a power generation efficiency increasing means according to the present invention; 
           [0032]      FIGS. 10   a  and  10   b  are views explaining an operation of a power generation efficiency increasing means according to the present invention; 
           [0033]      FIG. 11   a  is a view illustrating energy efficiency and energy loss rate of a variable windmill wing wind power generator having a power generation efficiency increasing means according to the present invention; 
           [0034]      FIG. 11   b  is a view illustrating a degree of energy efficiency of a variable windmill wing wind power generator having a power generation efficiency increasing means according to the present invention; 
           [0035]      FIG. 12  is an explanatory view of the relation of interaction in the rotation efficiency between upper and lower groups; 
           [0036]      FIG. 13   a  is a view illustrating power generation efficiency according to the wind speed of a conventional wind power generator; 
           [0037]      FIG. 13   b  is a view illustrating power generation efficiency of a variable windmill wing wind power generator having a power generation efficiency increasing means according to the present invention; 
           [0038]      FIG. 14   a  is a view illustrating a fixing means driving device according to the present invention, when the windmill wings rotate; 
           [0039]      FIG. 14   b  is a view illustrating the fixing means driving device according to the present invention, when the rotation of the windmill wings is stopped; 
           [0040]      FIG. 15  is a perspective view of a fixing means driving device according to the present invention; 
           [0041]      FIG. 16  is a bottom view of a fixing means driving device according to the present invention; 
           [0042]      FIG. 17   a  is an explanatory view of an operating state of the windmill wing fixing means according to the present invention, when the windmill wings rotate; 
           [0043]      FIG. 17   b  is an explanatory view of an operating state of the windmill wing fixing means according to the present invention, when the rotation of the windmill wings is stopped; 
           [0044]      FIG. 18   a  is a view of an operating state of the windmill wing fixing means according to the present invention, when the windmill wings rotate; 
           [0045]      FIG. 18   b  is a view of an operating state of the windmill wing fixing means according to the present invention, when the rotation of the windmill wings is stopped; 
           [0046]      FIG. 19   a  is a view of a state of the windmill wings displaced by the operation of the windmill wing fixing means according to the present invention, when the windmill wings rotate; 
           [0047]      FIG. 19   b  is a view of a state of the windmill wings displaced by the operation of the windmill wing fixing means according to the present invention, when the rotation of the windmill wings is stopped; and 
           [0048]      FIG. 20  is a schematic plan view of the flow of the wind between the windmill wings, when the variable windmill wing power generator having a power generation efficiency increasing means according to the present invention is installed in a plural number. 
           [0049]      FIG. 21  is a comparative view of the installation state of the windmill wings between the conventional wind power generator and the wind power generator according to the present invention; and 
           [0050]      FIG. 22  is a comparative view of the use efficiency of the installation land between the conventional wind power generator and the wind power generator according to the present invention. 
       
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       [0051]    A variable windmill wing wind power generator A having a power generation increasing means according to the present invention includes: an installation mount  10  stood on the floor in the shape of a cross (+) and having a vertical rotating shaft holder in a central portion thereof; a vertical rotating shaft  20  rotatably and uprightly installed in the central portion of the installation mount  10 ; a bearing  20 ′ into which a top end of the vertical rotating shaft  20  is rotatably inserted; ‘[’-shaped holders  30  connected and fixed between the bearing  20 ′ and the installation mount  10 ; a plurality of inner wing installation units  40  fixedly installed on the vertical rotating shaft  20  at given intervals in the up/down direction; support rods  40 ′ having one-side ends fixed to the inner wing installation units  40 ; a plurality of outer wing installation units  50  to which outer ends of the support rods  40 ′ are fixed; support rings  60  made of a steel wire and connected to the outer wing installation units  50  on the same plane; vertical support rods  60 ′ made of a steel wire and connecting the outer wing installation units  50  of the same group in the up/down direction, the upper and lower outer wing installation units  50  being grouped in the up/down multi-stage fashion; a plurality of support bars  60   a  made of a steel wire and connected between the highest support rod  40 ′ and the lowest support rod  40 ′ within the same group; a plurality of diagonal support bars  60   b  connected and fixed between upper and lower outer wing installation units  50  and  40  within the same group; a ladder  60   c ′ fixed to the support rod  40 ′ of each stage; windmill wings  70  installed between the inner wing installation units  40  and the outer wing installation units  50  in the up/down multi-stage fashion; support units  80  installed on the vertical rotating shaft  20  between the groups of the windmill wings  70  made in the up/down multi-stage fashion, and connected to the ‘[’-shaped holders  30  through wires  81 ; windmill wing fixing means  90 ′ installed on the vertical rotating shaft  20  above the inner wing installation units  40  to be movable in the up/down direction and fixing displacements of the windmill wings  70 ; fixing means driving device  100 ′ installed on the bottom end side of the vertical rotating shaft  20 ; a power generation increasing means  200  installed at the lower center portion of the installation mount  10  so as to be changed the number of power generation turbines according to the strength of wind; and a plurality of power generation means  300  installed on the bottom portion of the power generation increasing means  200  and for performing power generation. 
         [0052]    Each of the inner wing installation units  40  is divided into an installation unit  40   a  and an installation unit  40   b , which are coupled to each other by a bolt  41 , the ends of the support rods  40 ′ are inserted into the inner wing installation unit  40  in the horizontal direction from the front, rear, left and right directions and fixed thereto by a bolt  42  downwardly inserted from the top surface, the ends of wing rotating shafts  71  are rotatably inserted into the inner wing installation units  40  on the same plane as the support rods  40 ′, the ends of rotating shafts  96  of the windmill wing fixing means  90 ′ are rotatably inserted into the inner wing installation units  40  below the inserted portions of the support rods  40 ′ and the wing rotating shafts  71 , the other ends of the support rods  40 ′ are inserted into and fixed to the outer wing installation units  50 , and the respective other ends of the wing rotating shafts  71  and the rotating shafts  96  are rotatably inserted into the outer wing installation units  50 . 
         [0053]    Each of the windmill wings  70  includes a wing rotating shaft  71  rotatably installed between the inner wing installation unit  40  and the outer wing installation unit  50  on the same plane as the support rod  40 ′, a wing part  72  having one side fixed to the wing rotating shaft  71 , and a wing spring  73  inserted into a central portion of the wing rotating shaft  71  and maintaining the wing part  72  at 45° from the horizontal surface during non-operation. 
         [0054]    Here, the wing parts  72  are preferably made of a material having a light weight and a high density, and thus made of any one selected from the group consisting of transparent or opaque reinforced plastic, strengthened glass, non-ferrous metal, and duralumin. 
         [0055]    As shown in  FIG. 5 , the wing rotating shafts  71  located on the same plane within the same group are connected with plural steel wire support bars  60   c ,  60   d  and  60   f , and plural steel wire support bars  60   c  are connected and fixed between the support ring  60 . Also, the support bar  60   c  and the support bar  60   d , and the support bar  60   f  and the support ring  60  are connected with each other by support bars  60   g.    
         [0056]    The inner wing installation units  40  are divided into a structure in which the cutting side of the central portion for dividing the installation unit  40  into the installation unit  40   a  and the installation unit  40   b  is parallel to the outer side as shown in  FIG. 6  and a structure in which the cutting side for dividing the installation unit  40  into the installation unit  40   a ′ and the installation unit  40   b ′ is diagonal as shown in  FIG. 7   a . In addition, the moving units are divided into a structure in which the cutting side of the central portion for dividing the moving unit into the moving unit  91   a  and the moving unit  91   b  is parallel to the outer side as shown in  FIG. 6  and a structure in which the cutting side for dividing the moving unit into the moving unit  91   a ′ and the moving unit  91   b ′ is diagonal as shown in  FIG. 7   a . Referring to  FIG. 7   b , the installation units and the moving units are alternately installed so that the groups located over the support units  80  can be the groups in which the cutting surfaces are parallel to the outer side and the groups located below the support units  80  can be the groups in which the cutting surfaces are diagonal (or so that the groups located over the support units  80  can be the groups in which the cutting surfaces are diagonal and the groups located below the support units  80  can be the groups in which the cutting surfaces are parallel to the outer side). Therefore, the wing part  72  of one group which corresponds to the wing part  72  receiving the wind in the vertical direction among the wing parts  72  of the windmill wings  70  of the other group is more or less rotated than the wing part  72  receiving the wind in the vertical direction by 45°. In each group, whenever the wing rotating shafts  71  of the windmill wings  70  are rotated by 90°, the wing parts  72  receive the wind in the vertical direction. However, in terms of the entire groups, whenever the wing rotating shafts  71  are rotated by 45°, the wing parts  72  of the groups alternately receive the wind in the vertical direction. 
         [0057]    That is, as shown in  FIG. 11   a , if the wing parts  72  of a first group receive the wind in the vertical direction and the strength of wind is 100, when a wing part  72  is rotated by 10° and then located at the position of (a), the subsequent wing part  72  is located at the position of (b). Therefore, the wing part  72  located at the position of (a) receive the strength of wind corresponding to the value obtained by deducting the value that the wind is blocked by the wing part  72  located at the position of (b) from the value given as cosine x (x is an angle). Also, the wing part  72  located at the position of (b) receive the strength of wind corresponding to the value given as sine x (x is an angle). 
         [0058]    Accordingly, the strength of wind which the wing part  72  located at the position of (b) receives is 17.4 as sine 10° and the strength of wind which the wing part  72  located at the position of (a) receives is 98.5−17.4=81.1 as cosine 10°-17.4, so the sum of energy of two wing parts is 98.5 and thus the energy loss rate is 1.5 (that is, 100-98.5). Like this, the entire energy efficiency and energy loss rate according to the rotation of wing parts  72  of each group are shown in  FIG. 11   a  and the energy efficiency degree is shown in  FIG. 11   b , thus the power generation efficiency is enhanced. 
         [0059]    Also, when the strength of the wind which a wing part  72  in one group (A group) receives become maximum, the strength of the wind which a wing part  72  in the other group (A group) receives become minimum, and therefore, the rotation efficiency of the vertical rotary shaft  20  by the wing part  72  of A group and the rotation efficiency of the vertical rotary shaft  20  by the wing part  72  of B group are offset, as shown in  FIG. 12 , and thus a constant stable rotation efficiency can be obtained. 
         [0060]    Moreover, each of the support units  80  is divided into a support body  80   a  and a support body  80   b , which are coupled to each other by a bolt  82 , support plates are inserted into bottom circular projection portions  83  formed by the coupling of the support body  80   a  and the support body  80   b , each of the support plates is divided into a support plate  84   a  and a support plate  84   b  so that one support plate forms a hinge structure and the other support plate is coupled to a bolt  86  through the medium of a bracket  85 , the ends of the wires  81  are fixed to four edges of the coupled support plates  84   a  and  84   b , and the other ends of the wires  81  are connected and fixed to the ‘[’-shaped holders  30 . 
         [0061]    Here, the support bars  60   c ,  60   d ,  60   f ,  60   g , and  60   a , diagonal support bars  60   b , outer wing installation units  50 , support rings  60 , wing rotary shafts  71 , support bars  60   h , and inner wing installation units  40  have the dimension as the following table 1, preferably. 
         [0000]    
       
         
               
             
               
               
               
               
               
               
               
               
             
               
               
               
               
               
               
               
               
             
           
               
                 TABLE 1 
               
             
             
               
                   
               
               
                 Dimension of components of wind power generator 
               
             
          
           
               
                 Reference 
                   
                   
                   
                   
                   
                   
                   
               
               
                 numerals 
                   
                   
                   
                   
                   
                   
                 Total 
               
               
                 of 
                 Length 
                 num- 
                 ra- 
                 Circular 
                 Specific 
                 Weight 
                 length 
               
               
                 drawing 
                 (cm) 
                 ber 
                 dius 
                 constant 
                 gravity 
                 (kg) 
                 (cm) 
               
               
                   
               
             
          
           
               
                 60c 
                 630 
                 4 
                 1 2   
                 3.14 
                 7.85 
                 62.11 
                 2520 
               
               
                 60d 
                 420 
                 4 
                 1 2   
                 3.14 
                 7.85 
                 41.41 
                 1680 
               
               
                 60f 
                 210 
                 4 
                 1 2   
                 3.14 
                 7.85 
                 20.70 
                 840 
               
               
                 60g 
                 340 
                 4 
                 1 2   
                 3.14 
                 7.85 
                 33.52 
                 1360 
               
               
                 60a 
                 310 
                 12 
                 1 2   
                 3.14 
                 7.85 
                 91.69 
                 3720 
               
               
                 60b 
                 550 
                 4 
                 1 2   
                 3.14 
                 7.85 
                 54.22 
                 2200 
               
               
                 50 
                 450 
                 4 
                 1.5 2   
                 3.14 
                 7.85 
                 99.82 
                 1800 
               
               
                 60 
                 2826 
                 4 
                 1.5 2   
                 3.14 
                 7.85 
                 156.73 
                 2826 
               
               
                 71 
                 450 
                 8 
                 1 2   
                 3.14 
                 7.85 
                 85.68 
                 3600 
               
               
                 60h 
                 1,000 
                 4 
                 0.5 2   
                 3.14 
                 7.85 
                 24.69 
                 4000 
               
               
                 40 
                 310 
                 1 
                 4 2   
                 3.14 
                 7.85 
                 122.25 
                 310 
               
               
                   
               
             
          
         
       
     
         [0062]    As shown in the table 1, the support bodies, as various installation materials, including a plurality of support bars  60   a  for supporting the wind power generator A, a plurality of diagonal support bars  60   b , support bars  60   c , 60   d , 60   f , 60   g , and  60   h , and support rings  60  can be made to have a light weight and the reason is as follows. 
         [0063]    That is, as shown in  FIG. 21 , according to the conventional wind power generator, the windmill wings with heavy weight are fixed only at the center portion and thus an enormous force is acted by the principle of leverage of the windmill wings at the connection portion of the windmill wings. Therefore, a specific connection construction is required: a connection area of the connection portion must be increased especially. According to the present invention, the center of gravity of the windmill wings in the wind power generator A is spread and thus the supporting force of the windmill wings  70  is spread to a plurality of support bodies such as a plurality of support bars  60   a , a plurality of diagonal support bars  60   b , support bars  60   c ,  60   d ,  60   f ,  60   g , and  60   h , and support rings  60   c  and so on. Accordingly, the installation materials including the respective supporting bodies can be made to have a light weight and so the cost of materials can be reduced. 
         [0064]    Together with the spreading of the support force, the supporting bodies are constructed by a circular plane type, as shown in  FIG. 5 . According to the present invention, the windmill wings  70  located at a group of the wind power generator A (for example, the windmill wings of A group) are installed and then the windmill wings of B group can be easily installed on the windmill wings  70  of A group like an assembly type by using the circular plane of  FIG. 5  formed by support bodies of A group as a foothold. Accordingly, a tower crane required at the conventional installation work is unnecessary and thus the required installation cost can be reduced drastically. 
         [0065]    Each of the windmill wing fixing means  90 ′ is divided into the moving unit  91   a  and the moving unit  91   b , which are coupled to each other by a bolt  92  so that the moving unit  91   a  and the moving unit  91   b  can move in the up/down direction with the vertical rotating shaft  20  inserted into a central portion thereof, a moving shaft  93  for moving the moving unit  91   a  and the moving unit  91   b  in the up/down direction is inserted and fixed between the moving unit  91   a  and the moving unit  91   b , the ends of the straight lever  94  are fixed to outer surfaces of the coupled moving units  91   a  and  91   b , respectively, the ends of ‘L’-shaped levers  95  are rotatably connected to the other ends of the straight levers  94 , rotating shafts  96  provided with springs  96   a  are inserted into the other ends of the ‘L’-shaped levers  95  and rotatably inserted into the inner wing installation units  40 , stopper pins  95   a  for stopping rotation of the ‘L’-shaped levers  95  are inserted into and fixed to the inner wing installation units  40  on which the other ends of the ‘L’-shaped levers  95  are located, the springs  95   a  have the ends mounted on and fixed to the support rods  40 ′ and the other ends fixed on the ‘L’-shaped levers adjacent to the connection portions of the straight levers  94  and the ‘L’-shaped levers  95 , and a plurality of levers  97  are fixed on the rotating shafts  96  at given intervals. 
         [0066]    Also, the fixing means driving device  100 ′ includes: a rectangular box body  101 ′; a lower fixing plate  102 ′ fixed to a lower portion in the rectangular box body  101 ′; a pair of rollers  103 ′ installed at a lower side of the lower fixing plate  102 ′; lower rollers  104 ′ installed at every lower side corner of the lower fixing plate  102 ′; a lower moving plate  105 ′ moved upwardly and downwardly in the rectangular box body  101 ′; a spring  106 ′ inserted into the upper side center of the lower moving plate  105 ′; a plurality of moving shafts  107 ′ fixed uprightly at the corner of the lower moving plate  105 ′; an upper fixing plate  108 ′ fixed to an upper portion in the rectangular box body  101 ′; upper rollers  109 ′ installed at every lower side corner of the upper fixing plate  108 ′; an upper moving plate  110 ′ fixed at an upper end of a plurality of moving shafts  107 ′; a rope means  111 ′ comprising ropes  111   a ˜ 111   d  which is hung the rollers  103 ′ and upper and lower rollers  109 ′ and  104 ′; and a motor  112 ′ for winding and unwinding the rope means  111 ′. 
         [0067]    The rectangular box body  101 ′ includes a guide groove  101   a , which has oblong shapes at upper and lower portions thereof, formed at a side of the rectangular body. The lower fixing plate  102 ′ is fixed to a lower portion of the rectangular box body  101 ′ by a ‘┐’-shaped bracket al. The rollers  103 ′ and  104 ′ are fixed to a lower side of the lower fixing plate  102 ′ by a bracket b. The lower end of the moving shaft  107 ′ is fixed to the corner of the lower moving plate  105 ′ by nuts c and c′ and the upper end of the moving shaft  107 ′ is fixed to the upper moving plate  110 ′ by nuts c and c′. A guide member  105   a  having a guide protrusion d is fixed at an upper side end of the lower moving plate  105 ′ and the guide protrusion d is inserted into the guide groove  101   a . A fixing bolt e is formed at a side of the upper fixing plate  108 ′ and inserted and fixed into a side of the rectangular box body  101 ′, and an upper roller  109 ′ is fixed to a lower side of the upper fixing plate  108 ′ by a bracket b. 
         [0068]    Also, the power generation efficiency increasing means  200  includes: a circular plate shape switch driving means  202  installed at a support shaft, which installed uprightly and separately adjacent to the vertical rotating shaft  20 , by a bracket  201 ; a rudder  203  connected and installed to the switch driving means  202 , wherein it is rotated according to the wind blowing direction to receive the wind direction frontally; a switch  204  having a wind receiving wing  204   a  which is installed at a lower portion of the switch driving means  202  and turned on or off according to the strength of wind; a driving gear  206  connected with a lower end of the vertical rotating shaft  20  within a housing  205  equipped to a lower end portion of the vertical rotating shaft  20 ; a first driven gear  207  engaged with the driving gear  206 ; a second and a third driven gears  208  and  209  installed adjacent to the driving gear  206  and engaged with the driving gear  206  according to the strength of wind; and an air compressor  210  for pushing all or any one among the first to the third driven gears  207 , 208 , and  209  to the driving gear  206  through the respective linear actuators according to the contact point state of the switch so as to be engaged with the driving gear  206 . 
         [0069]    The switch  204  includes a wind receiving wing  204   a , a right side contact roller  204   b  contacted to the right outer circumferential edge of the switch driving means  202 , and a left side contact roller  204   b ′ contacted to the left outer circumferential edge of the switch driving means  202 . When the strength of wind becomes the constant strength, the right outer circumferential edge of the switch driving means  202  pushes the right contact roller  204   b  and is switched. When the strength of wind becomes stronger, the left outer circumferential edge of the switch driving means  202  pushes the left contact roller  204   b ′ and is switched. That is, the left and right outer circumferential edges of the switch driving means  202  are protruded with a constant angle and thus the protrusions push the left and right contact rollers  204   b ′ and  204   b  downwardly so that the switching of the switch  204  is performed. 
         [0070]    Also, the power generation means  300  includes power generators  301 , 302 , and  303  installed at the lower portions of the first to third driven gears  207 ,  208 , and  209  engaged with the driving gear  206 , respectively. 
         [0071]    The reason for dividing the support unit  80  into the support body  80   a  and the support body  80   b , the support plate into the support plate  84   a  and the support plate  84   b , the windmill wing fixing means  90 ′ into the moving unit  91   a  and the moving unit  91   b  or the moving unit  91   a ′ and the moving unit  91   b ′, and the inner wing installation unit  40  into the installation unit  40   a  and the installation unit  40   b  or the installation unit  40   a ′ and the installation unit  40   b ′ is because a corresponding broken part can be easily replaced and repaired in the event of a failure. 
         [0072]    Here, preferably, so as to increase the generated power, the windmill wings  70  are installed in the up/down n-stage, the wind power generator A having the up/down n-stage windmill wings  70  is installed in a plural number in the front/rear and left/right horizontal directions, and the power generation means  90  of the respective wind power generations A are electrically connected with each other, so that power generated by each power generation means  90  is combined. 
         [0073]    In addition, when the plurality of wind power generators A having the up/down n-stage windmill wings  70  are installed in the front/rear and left/right horizontal directions, as illustrated in  FIG. 20 , although a plurality of pillars X are vertically installed on front/rear and left/right outer portions, and connected and fixed to the bearing portions  20 ′ of the respective wind power generators A by wires Y, the wind power generators A do not hide the sunlight. Accordingly, the wind power generator A can be installed on a building, farmland, forest land, or marine farm, and thus is not limited in the installation location. 
         [0074]    Next, the operation of the variable windmill wing wind power generator having the power generation efficiency increasing means with the above-described construction according to the present invention will be described in detail. 
         [0075]    In the wind power generator A according to the present invention, the windmill wings  70  opposite to the wind blowing direction are pushed by the blowing wind, so that the wing parts  72  are suspended on the levers  97 , receive the wind in the vertical state, and thus push the support rods  40 ′. Therefore, the wing parts  72  receiving the wind rotate the vertical rotating shaft  20  through the wing rotating shafts  71 , thereby generating power. 
         [0076]    Here, as the wing parts  72  rotated upon the rotation of the vertical rotating shaft  20  by 90° from the vertical surface orthogonal to the direction of the wind rotated again, the wing parts  72  are lifted to the horizontal state due to the resistance force of the air, and thus do not receive the resistance of the air. As the vertical rotating shaft  20  rotates, the wing parts  72  rotate again. The wing parts  72  rotated by 270° from the vertical surface orthogonal to the direction of the wind rotate again, and thus maintain 45° from a horizontal surface by the wing spring  73 . In this situation, if the wing parts  72  rotate again, they are pushed again by the blowing wind, suspended on the levers  97 , receive the wind in the vertical state, and push the wing rotating shafts  71 , so that the vertical rotating shaft  20  is continuously rotated to generate power. 
         [0077]    Also, as the strength of wind increases, so does the number of generators. When the strength of wind is constant, as shown in  FIG. 9   a , the first driven gear  207  is engaged with the driving gear  206  connected with the vertical rotating shaft  20  and so the generator  301  connected at the lower portion of the first driven gear  207  is generated by rotating the vertical rotating shaft  20 . 
         [0078]    In the state that the generator  301  is only generated, when the wind exceeds a constant speed per second, as shown in  FIG. 10   a , a wind receiving wing  204   a  is pushed to the rear, so left and right contact rollers  204   b ′ and  204   b  are pushed to the rear together with a switch  203 . Thus, firstly, the right side contact roller  204   b  is pushed downwardly by the right circumferential surface edge of the switch driving means  202  and so a switch contact point is connected by the right side contact roller  204   b . An air compressor  208  is operated by the switch connection and so a linear actuator is operated and the second driven gear  208  is pushed to the driving gear  206 . As a result, the driving gear  206  and the second driven gear  208  are engaged with each other. Accordingly, as shown in  FIG. 9   b , the first and second driven gears  207  and  208  are simultaneously engaged with the driving gear  206  and so two power generators  301  and  302  are simultaneously generated. 
         [0079]    When the strength of wind become stronger, as shown in  FIG. 10   b , a wind receiving wing  204   a  is pushed more to the rear, so left and right contact rollers  204   b ′ and  204   b  are pushed to the rear together with a switch  203 . Thus, the left side contact roller  204   b ′ is pushed downwardly by the left circumferential surface edge of the switch driving means  202  and so a switch contact point is connected by the left side contact roller  204   b ′. At this time, two switch contact points are connected all by the left and right side contact rollers  204   b ′ and  204   b . Thus, an air compressor  208  is operated by the connection of two switches and so a linear actuator is operated and the third driven gear  209  together with the second driven gear  208  is pushed to the driving gear  206 . Accordingly, as shown in  FIG. 9   c , the first, second, and third driven gears  207 ,  208 , and  209  are simultaneously engaged with the driving gear  206  and so three power generators  301 ,  302 , and  303  are simultaneously generated. 
         [0080]    Here, although only the first, second and third driven gears  207 ,  208 , and  209  are installed and explained, the driven gear can be installed above three. 
         [0081]      FIG. 13   a  is a view illustrating power generation efficiency according to the wind speed of a conventional wind power generator.  FIG. 13   b  is a view illustrating power generation efficiency of a variable windmill wing wind power generator having a power generation efficiency increasing means according to the present invention. 
         [0082]    As shown in  FIG. 13   a , according to a conventional invention, if the wind with 6 m/s for 14 hours rises, the valid wind for generating power is 84 by 6×14 and the invalid entire wind for generating power is 116 by 18+98, so that the efficiency rate is 42% by 84/200. Whereas, as shown in  FIG. 13   b , according to the present invention, it is assumed that the wind with 4 m/s for 4 hours rises, the wind with 8 m/s for 4 hours rises, the wind with 12 m/s for 4 hours rises, and the wind with 16 m/s for 4 hours rises. 1). If the wind with 4 m/s for 4 hours rises, the valid wind for operating one generator is 16 by 4×4. 2). If the wind with 8 m/s for 4 hours rises, the valid wind for operating two generators is 32 by 8×4. 3). If the wind with 12 m/s for 4 hours rises, the valid wind for operating three generators is 46 by 12×4. 4). If the wind with 16 m/s for 4 hours rises, the valid wind for operating four generators is 64 by 16×4. Accordingly, the valid entire wind for generating power is 160 by 16+32+48+64 and the invalid entire wind for generating power is 40 by 8×5, so that the efficiency rate is 80% by 160/200. 
         [0083]    Also, since the wing parts  72  which form groups up and down are installed by the rotated state to the rotating direction with a constant angle, if the wing parts  72  of a group are rotated with a constant angle at the vertical surface to the wind direction, the wing parts  72  of another group form the same fashion, so that the wing parts  72  of each group form the vertical surface to the wind direction sequentially, thereby enhancing the power generation efficiency. 
         [0084]    The operation of the windmill wings  70  described above can be accomplished in that the wing parts  72  receiving the wind are suspended on the levers  97  in the front/rear direction (see  FIGS. 4   a  and  4   b ) and are horizontal with respect to the ground in the opposite side after 180° rotation. 
         [0085]      FIG. 20  is a schematic plan view of the flow of the wind between the windmill wings, when the variable windmill wing power generator having a power generation efficiency increasing means according to the present invention is installed in a plural number. 
         [0086]    As shown in  FIG. 20 , arrows P indicate the wind blowing directions and arrows Q indicate the rotation directions of the respective wind power generators A. The wind power generators A of the first column are rotated in the clockwise direction and the wind power generators A of the second column are rotated in the counterclockwise direction. In addition, the wind power generators A of the third column are rotated in the clockwise direction and the wind power generators A of the fourth column are rotated in the counterclockwise direction. In this way, the wind power generators A of the respective columns are alternately rotated in opposite directions. 
         [0087]    Here, the wind blowing into a wide region gets stronger through narrow regions such as between the wind power generators A of the first column and the wind power generators A of the second column and between the wind power generators A of the third column and the wind power generators A of the fourth column, so that the power generation efficiency of the wind power generators A increases. In this case, even if the wind blows in the front/rear, left/right or diagonal direction, the wind power generators A make a pair by two columns, so that the wind power generators A of one column are rotated in the clockwise direction and the wind power generators A of the other column are rotated in the counterclockwise direction to generate power. 
         [0088]    The rotation directions of the wind power generators A as described above can be accomplished in that each column selectively employs the structure in which the wing parts  72  are suspended on the front lever  97  in the rear (see  FIG. 4   a ) and the structure in which the wing parts  72  are suspended on the rear levers  97  in the front (see  FIG. 4   b ). That is, the wind power generators A having the windmill wings  70  as shown in  FIG. 4   a  are rotated in the clockwise direction and the wind power generators A having the windmill wings  70  as shown in  FIG. 4   b  are rotated in the counterclockwise direction. 
         [0089]      FIG. 21  is a comparative view of the installation state of the windmill wings between the conventional wind power generator and the wind power generator according to the present invention. 
         [0090]    As shown in  FIG. 21 , in the conventional invention, the windmill wings with the height of wing of 50 m are installed at the height between 22 m and 122 m from the ground, whereas, the present invention has three groups up and down, in each group, a plurality of wings are installed up and down and the wings are installed at the height between 18 m and 100 m from the ground. 
         [0091]      FIG. 22  is a comparative view of the use efficiency of the installation land between the conventional wind power generator and the wind power generator according to the present invention. 
         [0092]    As shown in  FIG. 22 , the view is comparing an installation region SP 1  of the power generator with the length of wing of 50 m according to the conventional invention with an installation region SP 2  of the power generator with the length of wing of 5 m according to the present invention. The installation region SP 1  of the power generator according to the conventional invention is 50 2 ×π and the installation region SP 2  of the power generator according to the present invention is 5 2 ×π, so that the present invention can increase 100 times of the use efficiency of the installation land compared to the conventional invention. 
         [0093]    If the wind power generator A having the variable windmill according to the present invention which performs the wind power generation as described above, as illustrated in  FIGS. 14   a ,  17   a ,  18   a ,  19   a , in a state where the windmill wing fixing means  90 ′ do not operate, the lever  97  have a vertical downward state to maintain the windmill wings  70  receiving the wind to be in the vertical state, so that the windmill wings  70  operate in the normal state and generate power. 
         [0094]    If it is necessary to protect the wind power generator A from the storm or to mend, manage and repair the wind power generator A, in order to stop the operation of the wing power generator A, the fixing means driving device  100 ′ is operated as shown in  FIG. 14   b , thus upwardly moving the moving shaft  93  of the windmill wing fixing means  90 ′ as shown in  FIGS. 17   b ,  18   b , and  19   b . That is, when the motor  112 ′ is rotated in the normal direction, a rope  111  is wound to a shaft of the motor  112 ′, a spring  106 ′ is compressed, and a lower moving plate  105 ′ is lifted, so that a moving shaft  107 ′ is lifted and the lifted moving shaft  107 ′ upwardly moves the upper moving plate  110 ′. 
         [0095]    The lifted upper moving plate  110 ′ upwardly moves the moving shaft  93 , so that the moving units  91   a  and  91   b  fixed to the moving shaft  93  are lifted along the vertical rotating shaft  20 , and thus the straight levers  94  are lifted. At this time, also a guide protrusion d is lifted along a guide groove  101   a  at a state that a lower switch contact point, which is not shown, is connected, and thus, at the state that the straight lever  94  is completely lifted, the fore-end of the guide protrusion d disconnects the upper switch contact point of a switch means, which is not shown, thus upwardly pulling the ‘L’-shaped levers  95 . Thus, the rotation shafts  96  are rotated, so that the levers  97  lift the wing parts  72  of the windmill wings  70 . Thus, the wing parts  72  of the entire windmill wings  70  maintain the horizontal state with respect to the ground not to receive the blowing wind (the state of  FIGS. 14   b , 17   b ,  18   b  and  19   b ) and the rotation of the vertical rotating shaft  20  is stopped. In this situation, the wind power generator A can be mended, managed and repaired. 
         [0096]    Here, differently from the case in which the operation of the wind power generator A is stopped by upwardly moving the moving shaft  93  completely, the angle of the vertical surface to the wing parts  72  of the windmill wings  70  can be set according to the degree of upwardly moving the moving shaft  93 . In the event of a storm, the moving shaft  93  is upwardly moved and fixed in advance according to the predicted intensity of the storm, so that the wing parts  72  do not receive the entire wind, but make some of the wind pass by. As a result, the wind power generator A can be protected from the storm. 
         [0097]    Moreover, the operation of the wind power generator A is stopped by upwardly moving the moving shaft  93  completely and then a worker for mending the wind power generator climbs up a ladder  60   c  to a working position, or goes up with a small-sized ladder on occasional demands and drapes the small-sized ladder between the horizontal support rods  40 ′ and then moves toward the working position, mounting the small-sized ladder. 
         [0098]    Also, in order to lower and return the lifted moving shaft  93 , the motor  112 ′ is rotated in the reverse direction. That is, when the motor  112 ′ is rotated in the reverse direction, the rope wound to the shaft of the motor  112 ′ is unwound and the lower moving plate  105 ′ is lowered by the elastic force of the spring  106 ′, so that the moving shaft  107 ′ is lowered and the upper moving plate  110 ′ is lowered. 
         [0099]    Therefore, the lowering of the upper moving plate  110 ′ downwardly moves the moving shaft  93 . At this time, also a guide protrusion d is lowered along a guide groove  101   a  and so an upper switch contact point, which is not shown, is connected. Through the lowering of the moving shaft  93 , when the ends of the ‘L’-shaped lever  95  are suspended on the stopper pins  95   a  and does not rotated, the fore-end of the guide protrusion d disconnects the upper switch contact point of a switch means, which is not shown and thus the levers  97  moves downwardly and vertically. As a result, the wind power generator A reaches the state shown in  FIGS. 14   a ,  17   a ,  18   a , and  19   a , i.e., the normal power generation state. 
         [0100]    While the present invention has been illustrated and described in connection with the preferred embodiments, the present invention is not limited thereto. Accordingly, it will be understood by those skilled in the art that various modifications and changes can be made thereto without departing from the scope of the invention defined by the appended claims.