Abstract:
[Problem] To provide a wind power generation device that, by using a structure that easily receives drag, improves the certainty of starting up on activation and is capable of increasing the amount of electric power generated from natural energy by the entire device. 
     [Solution] A wind power generation device having a vertical rotary shaft ( 2 ) that imparts a rotating force to a wind power generation motor ( 7 ), multiple support arms ( 3 ) that extend from this vertical rotary shaft ( 2 ) and are radially arranged at equal intervals, and wind paddles ( 4 ) that are connected to the tips of the respective support arms ( 3 ), wherein each wind paddle ( 4 ) is provided with a concave panel part ( 41 ) wherein the outer surface side is curved or bent into a concave shape in a plan view and a front edge airflow reservoir part ( 42 ); that protrudes toward the outer surface side along the front edge part ( 45 ) of this concave panel part ( 41 ) in the rotating direction with the front end part thereof being curved or bent toward the trailing edge side.

Description:
TECHNICAL FIELD 
       [0001]    The present invention relates to a wind power generator that uses renewable energy. 
       BACKGROUND ART 
       [0002]    In the world, there are many people for whom it is difficult to enjoy the convenience of electricity, such as residents of an area where neither a power generator set nor a power transmission line is installed and nomads who have no settled residence. In the past, those people used a generator that is easy to install, such as a compact solar photovoltaic panel, to generate electric power. However, the solar photovoltaic panel can generate electric power only during the daytime when the panel can receive sunlight and therefore has a problem that the panel cannot electric power during the night when electric power is most needed for illumination or other purposes. 
         [0003]    In recent years, compact wind power generators have been proposed that have simple structures, are robust and easy to install and can generate electric power even during the night. 
         [0004]    For example, in Japanese Patent No. 3451085, there is proposed a wind turbine for wind power generation having a plurality of blades arranged in a plane perpendicular to a vertical rotation shaft at regular angular intervals about the vertical rotation shaft, in which the blades have an airfoil shape, and the blade is partially cut away on the rotation shaft side from a point at a distance of 35% to 45% of the chord length from the front edge to the rear edge (Patent Literature 1). According to Patent Literature 1, the wind turbine for wind power generation can efficiently revolve even when the wind turbine is activated or even in a low wind speed range, because the cut-away part of the blade on the side of the airfoil lower surface generates a high air resistance, and characteristics of the drag type wind turbine and characteristics of the lift type wind turbine are effectively combined. 
       CITATION LIST 
     Patent Literature 
       [0005]    Patent Literature 1: Japanese Patent No. 3451085 
       SUMMARY OF INVENTION 
     Technical Problem 
       [0006]    However, according to the invention described in Patent Literature 1, the wind turbine is designed mainly for producing lift, the width of the cut-away part receiving the air resistance cannot be equal to or larger than the thickness of the blade. Therefore, the area of the cut-away part that receives wind is extremely narrow, and there is a possibility that a rotational moment enough to activate the blade is not produced in a low wind speed range in which little lift is produced. 
         [0007]    Some of the conventional propeller-type wind power generators are designed to be activated in a low wind speed range equal to or lower than 3 m/s. However, to activate such wind power generators at a wind speed equal to or lower than 3 m/s, the wind needs to blow approximately perpendicularly to the propellers, and it is practically difficult to activate the power generators at a wind speed equal to or lower than 3 m/s. 
         [0008]    The present invention has been devised to solve the problem described above, and an object of the present invention is to provide a wind power generator that has a structure that easily receives a drag in a direction of rotation and allows the wind power generator to start operating with higher reliability when activated, and can generate an increased amount of electric power as a whole by using natural energy. 
       Solution to Problem 
       [0009]    A wind power generator according to the present invention comprises: a vertical rotation shaft that transmits a rotational force to a wind power generating motor; a plurality of supporting arms radially provided on the vertical rotation shaft at regular intervals; and a wind paddle connected to a tip end of each of the supporting arms, and the wind paddle includes a concave panel part and a front edge airflow reservoir part, the concave panel part being curved or bent to be recessed on the side of an outer surface thereof in plan view, the front edge air flow reservoir part being provided along a front edge part of the concave panel part, which is located forward in a direction of rotation, and protruding on the side of the outer surface, and a tip end portion of the front edge airflow reservoir part being curved or bent toward a rear edge part of the concave panel part. 
         [0010]    According to an aspect of the present invention, the wind paddle and the supporting arm may be connected to each other at a point closer to a front edge part of the wind paddle than a midpoint between the front edge part and the rear edge part of the wind paddle. 
         [0011]    According to an aspect of the present invention, the length from a part of the wind paddle connected to the supporting arm to the rear edge part of the wind paddle may be longer than the supporting arm. 
         [0012]    According to an aspect of the present invention, the wind paddle may include an upper edge airflow stopping part and a lower edge airflow stopping part provided on the side of the outer surface along an upper edge part and a lower edge part of the concave panel part. 
         [0013]    Furthermore, the vertical rotation shaft may be rotatably supported in a floating state by a repulsive force of magnets. 
         [0014]    According to an aspect of the present invention, the wind paddle may have a vertically elongated shape with a vertical dimension thereof being longer than the distance between the front edge part and the rear edge part, a solar photovoltaic power generating element may be provided on either or both of an inner surface and the outer surface of the concave panel part, the wind power generator may include an energizing mechanism that passes a current between an electrode of the solar photovoltaic power generating element and an electrode provided on a shaft support that supports the vertical rotation shaft, and the energizing mechanism may include: an element-side positive electrode gear that is fixed to the vertical rotation shaft and connected to a positive electrode of the solar photovoltaic power generating element so that a current can flow therebetween; an element-side negative electrode gear that is fixed to the vertical rotation shaft and connected to a negative electrode of the solar photovoltaic power generating element so that a current can flow therebetween; a shaft support-side positive electrode gear that is rotatably fixed to the shaft support, engaged with the element-side positive electrode gear and connected to a positive electrode of the shaft support so that a current can flow therebetween; and a shaft support-side negative electrode gear that is rotatably fixed to the shaft support, engaged with the element-side negative electrode gear and connected to a negative electrode of the shaft support so that a current can flow therebetween. 
       Advantageous Effect of Invention 
       [0015]    According to the present invention, the wind power generator has a structure that easily receives a drag in a direction of rotation and allows the wind power generator to start operating with higher reliability when activated, and can generate an increased amount of electric power as a whole by using natural energy. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0016]      FIG. 1  is a perspective view of a wind power generator according to an embodiment of the present invention. 
           [0017]      FIG. 2  is a vertical cross-sectional view showing an inside of a shaft support according to the embodiment. 
           [0018]      FIG. 3  is a plan view of the wind power generator according to the embodiment. 
           [0019]      FIG. 4  is a front view of a wind paddle according to the embodiment. 
           [0020]      FIG. 5  is a plan view showing an airflow to the wind power generator in a case where the wind power generator receives wind from the side of a wind paddle  4 A. 
           [0021]      FIG. 6  is a plan view showing an airflow to the wind power generator in a case where the wind power generator receives wind from the side of the wind paddle  4 A and a wind paddle  4 C. 
           [0022]      FIG. 7  is a perspective view of a wind power generator according to another embodiment of the present invention. 
           [0023]      FIG. 8  is a perspective view of a wind power generator according to another embodiment of the present invention. 
           [0024]      FIG. 9  is a plan view of a wind power generator according to another embodiment of the present invention. 
       
    
    
     DESCRIPTION OF EMBODIMENTS 
       [0025]    In the following, a wind power generator  1  according to an embodiment of the present invention will be described with reference to the drawings. 
         [0026]    As shown in  FIG. 1 , the wind power generator  1  according to this embodiment comprises a vertical rotation shaft  2  that transmits a rotational force to a wind power generating motor  7 , a plurality of supporting arms  3  radially arranged at regular intervals from the vertical rotation shaft  2 , wind paddles  4  connected to the supporting arms  3  at tip ends thereof, solar photovoltaic power generating elements  5  provided on surfaces of the wind paddles  4 , and a shaft support  6  that rotatably supports the vertical rotation shaft  2 . 
         [0027]    The components of the wind power generator  1  according to this embodiment will be individually described in detail below. 
         [0028]    The vertical rotation shaft  2  is formed by a steel pipe or the like and is rotatably vertically supported by the shaft support  6  as shown in  FIG. 1 . As shown in  FIG. 2 , the vertical rotation shaft  2  according to this embodiment rotatably supported on the shaft support  6  is held at two vertically spaced points by a ball bearing  63  for reducing the rotational friction and a socket  67  for preventing a shaft misalignment during rotation. 
         [0029]    As shown in  FIG. 2 , the vertical rotation shaft  2  and the shaft support  6  are provided with a pair of magnets  66 ,  66  that are arranged with the like poles (the S pole and the S pole, or the N pole and the N pole, for example) being opposed to each other, and the vertical rotation shaft  2  can be supported by the shaft support  6  in a state where the vertical rotation shaft  2  floats in the shaft support  6  by the action of the repulsive force between the magnets  66  and  66 . In this embodiment, the magnets  66  are neodymium magnets, which have a strong magnetic force. 
         [0030]    The vertical rotation shaft  2  is provided with a rotation transmission mechanism  8 , which transmits the rotational force of the vertical rotation shaft  2  to the wind power generating motor  7 , at a lower end thereof as described later. Furthermore, a chromium-plated sheet or the like that is mirror-finished to have a high light reflectance is applied to a surface of the vertical rotation shaft  2  so as to reflect more sunlight toward the wind paddles  4 . 
         [0031]    The supporting arms  3 , which support the wind paddles  4 , are fixed to the vertical rotation shaft  2  at regular intervals to radially extend from the vertical rotation shaft  2 . In this embodiment, as shown in  FIGS. 1 and 3 , three pairs of upper and lower supporting arms  3  are provided on the vertical rotation shaft  2  at intervals of 120° along the circumference thereof, and the upper and lower supporting arms  3  of each pair are connected to an upper end and a lower end of one wind paddle  4 , respectively. Upper supporting arms  31  are made of a transparent material, such as an acrylic resin, and surfaces of lower supporting arms  32  are mirror-finished to have a high light reflectance so as to guide more sunlight to the wind paddles  4 . 
         [0032]    The number of and the circumferential interval between the supporting arms  3  are not particularly limited and can be appropriately determined taking into consideration the shape or weight of the wind paddles  4  to be supported or the amount of received sunlight, for example. 
         [0033]    The wind paddles  4  receive wind and produce a rotational force on the vertical rotation shaft  2 . The wind paddle  4  has a concave panel part  41  that receives wind and guides the wind toward the front edge and a front edge airflow reservoir part  42  that receives the wind guided by the concave panel part  41  and converts the force of the wind into a rotational force. As shown in  FIG. 1 , the wind paddle  4  according to this embodiment has an upper edge airflow stopping part  43  and a lower edge airflow stopping part  44  that prevent the wind received by the concave panel part  41  from escaping in the vertical direction. In short, the wind paddle  4  according to this embodiment is a paddle part of a paddle-type wind power generator that has a novel shape. 
         [0034]    In this embodiment, as shown in  FIGS. 1 and 3 , the concave panel part  41  is a panel having a substantially rectangular shape that is curved in plan view. Thus, as shown in  FIG. 5 , when the concave panel part  41  is arranged with the concave surface facing outward, the concave panel part  41  can more efficiently receive wind blowing from the outside and guide the received wind toward the front edge. The present invention is not limited to the concave panel part  41  that is curved in plan view, and a polygonal panel formed by straight lines in plan view as shown in  FIG. 9  is also possible. 
         [0035]    As shown in  FIG. 3 , the concave panel part  41  according to this embodiment is shaped with the length from the part thereof connected to the supporting arm  3  to a rear edge part  46  thereof being longer than the supporting arm  3 . By increasing the length from the part connected to the supporting arm  3  to the rear edge part  46  in this way, as shown in  FIG. 5 , the area of the following concave panel part  41  that is hidden by the concave panel part  41  from the wind is increased. 
         [0036]    Furthermore, solar photovoltaic power generating elements  5  are provided on both an inner surface and an outer surface of the concave panel part  41  according to this embodiment. In order to increase the area where the solar photovoltaic power generating elements  5  can be provided, the concave panel part  41  has a vertically elongated shape with the vertical dimension thereof being longer than the width from a front edge part  45  to the rear edge part  46 . In this embodiment, the solar photovoltaic power generating elements  5  are amorphous-based solar cells. However, any other material that converts optical energy of sunlight into electric power can be used. Furthermore, although the solar photovoltaic power generating elements  5  are provided on both an outer surface  411  and an inner surface  412  of the concave panel part  41 , the solar photovoltaic power generating element  5  may be provided on only one of the surfaces. 
         [0037]    The material of the concave panel part  41  is not particularly limited and can be appropriately selected from among metals or synthetic resins, for example. The panel itself may be a solar photovoltaic power generating panel, or a film provided with the solar photovoltaic power generating element  5  may be applied to a surface of the panel. 
         [0038]    The front edge airflow reservoir part  42  is provided along the front edge part  45 , which is located forward in the direction of rotation of the concave panel part  41 , and protrudes outward, and a tip end portion thereof is curved or bent toward the rear edge of the concave panel part  41 . The front edge airflow reservoir part  42  according to this embodiment is formed by an aluminum pipe to reduce the weight. The front edge air flow reservoir part  42  has a circular or arc-shaped outer periphery that is smoothly connected to the concave panel part  41  in plan view as shown in  FIGS. 1 and 3 , and an inner portion of the front edge airflow reservoir part  42  is cut away along the axis thereof to form an airflow stopping hole  49 . 
         [0039]    The present invention is not limited to the front edge airflow reservoir part  42  formed by a pipe, and the front edge airflow reservoir part  42  may be appropriately formed by a rectangular panel member or the like as shown in  FIG. 9 . 
         [0040]    The upper edge airflow stopping part  43  is provided on the side of the outer surface  411  of the concave panel part  41  along an upper edge part  47  of the concave panel part  41 . As shown in  FIGS. 1 and 3 , the upper edge airflow stopping part  43  according to this embodiment is formed by a transparent acrylic plate provided to cover the upper edge part  47  of the concave panel part  41  from the upper edge part  47  to the front edge airflow reservoir part  42 . Therefore, the upper edge airflow stopping part  43  not only stops the airflow of the wind received by the concave panel part  41  but also transmits sunlight to increase the amount of sunlight reaching the outer surface  411  of the concave panel part  41 . 
         [0041]    The lower edge airflow stopping part  44  is provided on the side of the outer surface  411  of the concave panel part  41  along a lower edge part  48  of the concave panel part  41 . As shown in  FIGS. 1 and 3 , the lower edge airflow stopping part  44  according to this embodiment is formed by an acrylic plate provided to cover the lower edge part  48  of the concave panel part  41  from the lower edge part  48  to the front edge airflow reservoir part  42 . An upper surface of the lower edge airflow stopping part  44  is mirror-finished to have a high light reflectance, so that the lower edge airflow stopping part  44  not only stops the airflow of the wind received by the concave panel part  41  but also reflects received sunlight toward the outer surface  411  of the concave panel part  41 . 
         [0042]    As shown in  FIG. 3 , the wind paddle  4  is connected to the supporting arm  3  at a point closer to the front edge part  45  than the midpoint between the front edge part  45  and the rear edge part  46  of the wind paddle, in order to increase the wind receiving area toward the rear edge thereof. Furthermore, the wind paddle  4  is supported by the supporting arm  3  in an inclined state with the front edge airflow stopping parts  42  inwardly deflected in order to facilitate the airflow from the rear edge part  46  to the front edge part  45 . According to this embodiment, the wind paddles  4  are inclined at an angle of approximately 7° to 8° with respect to a tangent to the rotational orbit. If the angle is too small, wind is less likely to flow along the wind paddle  4 . On the other hand, if the angle is too large, the drag of the wind on the wind paddle  4  decreases. 
         [0043]    Next, the shaft support  6  and an internal configuration thereof will be described. As shown in  FIG. 1 , the shaft support  6  has a base part  61  at a lower end thereof and a shaft supporting part  62  provided on the base part  61 . The base part  61  according to this embodiment is intended to fix the wind power generator  1  in a standing position and is formed by a rectangular plate having four holes, through which bolts are inserted, at four corners thereof. 
         [0044]    The shaft supporting part  6  has a cylindrical shape and contains the wind power generating motor  7 , a rotation transmission mechanism  8  that transmits the rotational force of the vertical rotation shaft  2  to the wind power generating motor  7 , a solar photovoltaic charger  9  that accumulates electric power generated by the solar photovoltaic power generating element  5 , and an energizing mechanism  10  that passes a current between an electrode of the solar photovoltaic power generating element  5  and an electrode of the solar photovoltaic charger  9 , as shown in  FIG. 2 . 
         [0045]    The wind power generating motor  7  is a common power generating motor having a rotation shaft  71  and is fixed in the shaft support  6  as shown in  FIG. 2 . 
         [0046]    The rotation transmission mechanism  8  is a mechanism that transmits the rotational force of the vertical rotation shaft  2  to the rotation shaft  71  of the wind power generating motor  7 . According to this embodiment, the rotation transmission mechanism  8  has a motor-side gear  81  provided on the rotation shaft  71  of the wind power generating motor  7  and a rotation shaft-side gear  82  provided at the lower end of the vertical rotation shaft  2 . That is, the rotation transmission mechanism  8  according to this embodiment is configured to transmit the rotational force of the vertical rotation shaft  2  to the rotation shaft  71  of the wind power generating motor  7  by engagement of the motor-side gear  81  and the rotation shaft-side gear  82 . 
         [0047]    The solar photovoltaic charger  9  is a common charger that accumulates electric power generated by the solar photovoltaic power generating elements  5  provided on both the surfaces of the curved panel part  41  and is installed in the shaft support  6  as shown in  FIG. 2 . 
         [0048]    The energizing mechanism  10  is a mechanism that passes a current between an electrode of the solar photovoltaic power generating element  5  and an electrode of the solar photovoltaic charger  9 , and entanglement of cords or the like thereof does not occur even when the vertical rotation shaft  2  rotates. According to this embodiment, as shown in  FIG. 2 , the energizing mechanism  10  has an element-side positive electrode gear  101  and an element-side negative electrode gear  102  fixed to the vertical rotation shaft  2  and a shaft support-side positive electrode gear  103  and a shaft support-side negative electrode gear  104  rotatably fixed to the shaft support  6 . 
         [0049]    The element-side positive electrode gear  101  is a gear, such as a spur gear, that is made of a conductive material, such as a metal. The element-side positive electrode gear  101  is fixed to a lower end part of the vertical rotation shaft  2  and is connected by wire to a positive electrode  51  of the solar photovoltaic power generating element  5  so that a current can flow therebetween. 
         [0050]    As with the element-side positive electrode gear  101 , the element-side negative electrode gear  102  is a gear, such as a spur gear, that is made of a conductive material, such as a metal. The element-side negative electrode gear  102  is fixed to the lower end part of the vertical rotation shaft  2  and is connected by wire to a negative electrode  52  of the solar photovoltaic power generating element  5  so that a current can flow therebetween. The element-side negative electrode gear  102  and the element-side positive electrode gear  101  are electrically isolated from each other, so that no current flows therebetween. 
         [0051]    The shaft support-side positive electrode gear  103  is a gear that is made of a conductive material, such as a metal, and is rotatably fixed to the shaft support  6  at a position where the shaft support-side positive electrode gear  101  is engaged with the element-side positive electrode gear  101 . Therefore, the shaft support-side positive electrode gear  103  comes into contact with and is engaged with the element-side positive electrode gear  101 , and a current flows therebetween. The shaft support-side positive electrode gear  103  is connected to a positive electrode  91  of the solar photovoltaic charger  9  provided in the shaft support  6  so that a current can flow therebetween. 
         [0052]    As with the shaft support-side positive electrode gear  103 , the shaft support-side negative electrode gear  104  is a gear that is made of a conductive material, such as a metal, and is rotatably fixed to the shaft support  6  at a position where the shaft support-side negative electrode gear  104  is engaged with the element-side negative electrode gear  102 . Therefore, the shaft support-side negative electrode gear  104  comes into contact with and is engaged with the element-side negative electrode gear  102 , and a current flows therebetween. The shaft support-side negative electrode gear  104  is connected to a negative electrode  91  of the solar photovoltaic charger  9  provided in the shaft support  6  so that a current can flow therebetween. Furthermore, the shaft support-side negative electrode gear  104  and the shaft support-side positive electrode gear  103  are electrically isolated from each other, so that no current flows therebetween. 
         [0053]    Next, an operation of each component of the wind power generator  1  according to this embodiment will be described. 
         [0054]    First, a case where the wind power generator  1  according to this embodiment receives wind from the side of a wind paddle  4 A (from bottom to top in  FIG. 5 ) as shown in  FIG. 5  will be described. 
         [0055]    In this case, the wind paddle  4 A receives the wind primarily at the outer surface  411  of the concave panel part  41 . The received wind flows along the concave panel part  41 , which is curved and inclined with respect to the tangent to the rotational orbit, from the rear edge part  46  to the front edge part  45 . Since the wind paddle  4 A according to this embodiment is shaped to be longer on the rear edge side, the wind paddle  4 A can guide more air flow toward the front edge part  45 . Furthermore, the upper edge airflow stopping part  43  and the lower edge airflow stopping part  44  prevents the airflow of the wind hitting the outer surface  411  of the concave panel part  41  from flowing in the vertical direction and guide the wind toward the front edge part  45 . 
         [0056]    The front edge airflow reservoir part  42  of the wind paddle  4 A receives the wind flow and reacts to the force of the wind by producing a rotational torque about the vertical rotation shaft  2 . Since the tip end portion of the front edge airflow reservoir part  42  is curved or bent toward the rear edge, the airflow guided from the rear edge side can be efficiently converted into a rotational torque. The rotational torque is transmitted to the vertical rotation shaft  2  through the supporting arm  3  to make the vertical rotation shaft  2  rotate. The direction of rotation of the wind paddle  4  is a counterclockwise direction in  FIG. 5 . 
         [0057]    At the same time, a wind paddle  4 B receives the wind primarily at the inner surface  412  of the concave panel part  41  and produces a pushing force in the direction of the wind as shown in  FIG. 5 . Therefore, the wind paddle  4 B pushed by the wind makes the vertical rotation shaft  2  rotate in the counterclockwise direction in  FIG. 5 . In this embodiment, since the length from the part of the wind paddle  4 A connected to the supporting arm  3  to the front edge part  45  is short, the wind paddle  4 B can receive more wind. 
         [0058]    On the other hand, a wind paddle  4 C rotates against the wind and produces a rotational force in the opposite direction (clockwise direction) to the rotational direction (counterclockwise direction) of the vertical rotation shaft  2 . However, since the wind paddle  4 A is shaped to be longer on the rear edge side, the following wind paddle  4 C is shielded to some extent by the wind paddle  4 A from the wind, so that the rotational force in the opposite direction is small. In addition, the wind paddle  4 C is disposed on the tip end of the supporting arm  3  with the outer surface  411  of the concave panel part  41  facing outward. Therefore, the wind paddle  4 C has a small projected area in the wind direction as shown in  FIG. 5 , and therefore, the rotational force in the opposite direction (clockwise direction) produced by the drag of the wind is small. 
         [0059]    Since the wind paddle  4  according to this embodiment is formed in an airfoil shape, the airflow in the vicinity of the front edge part  45  is straightened to reduce the number of stagnation points that occur at the front edge airflow stopping part  42 , and the resistance to the rotational force of the vertical rotation shaft  2  is further reduced. 
         [0060]    As can be seen from the above description, if the wind power generator  1  receives wind from the side of the wind paddle  4 A as shown in  FIG. 5 , the wind paddles  4 A and  4 B easily produce the rotational moment in the counterclockwise direction from the drag of the wind. On the other hand, the wind paddle  4 C is located at a position where the wind paddle  4 C rotates in the direction opposite to the wind direction. However, the wind paddle  4 C receives a small amount of wind, has a small projected area and therefore receives a small wind drag, so that production of a rotational moment that hinders the rotation of the vertical rotation shaft  2  is suppressed. 
         [0061]    Next, a case where the wind power generator  1  receives wind from the side of the wind paddles  4 A and  4 C (from bottom to top in  FIG. 6 ) as shown in  FIG. 6  will be described. 
         [0062]    As shown in  FIG. 6 , the wind paddle  4 A receives the wind primarily at the outer surface  411  of the concave panel part  41 . The received wind flows along the concave panel part  41  from the rear edge part  46  to the front edge part  45 . The front edge airflow reservoir part  42  receives the wind flow and reacts to the force of the wind by producing a rotational torque in the counterclockwise direction about the vertical rotation shaft  2 . The amount of the wind received by the wind paddle  4 A is smaller than the amount of the wind received by the wind paddle  4 A in the case where the outer surface  411  of the concave panel part  41  directly receives the wind. However, the supporting arm  3  adds to the distance between the wind paddle  4 A and the vertical rotation shaft  2 , so that the wind paddle  4 A can produce a high torque with the reduced amount of wind. 
         [0063]    As shown in  FIG. 6 , the inner surface  412  of the concave panel part  41  of the wind paddle  4 B faces the wind, so that the wind paddle  4 B produces little rotational force in the direction of rotation and the opposite direction. Therefore, the wind paddle  4 B makes little contribution to the rotation of the vertical rotation shaft  2 . 
         [0064]    On the other hand, as shown in  FIG. 6 , the wind paddle  4 C is in the inclined position with the front edge inwardly deflected with respect to the wind direction. As a result, the wind is divided by the front edge airflow reservoir part  42  into an inner flow and an outer flow. The inner surface  412  of the concave panel part  41  and the front edge airflow reservoir part  42  formed in an airfoil shape produce a pressure difference between the outer side and the inner side of the wind paddle  4 C and produce a lift in the inward direction. In general, a lift of a wing is a force to pull to the front edge side and to the convex surface side. Therefore, as shown in  FIG. 6 , the lift is a force to make the vertical rotation shaft  2  rotate in the positive direction (counterclockwise direction). According to this embodiment, the wind paddle  4  has a vertically elongated shape with the vertical dimension thereof longer than the distance between the front edge part  45  and the rear edge part  46  and therefore efficiently produces a lift. 
         [0065]    As can be seen from the above description, if the wind power generator  1  receives wind from the side of the wind paddles  4 A and  4 C as shown in  FIG. 6 , the wind paddle  4 A receives the wind at a position where the wind paddle  4 A can easily produce a torque on the vertical rotation shaft  2  and produces a rotational moment in the counterclockwise direction from the drag of the wind. On the other hand, the wind paddle  4 C is located at a position where the wind paddle  4 C rotates in the direction opposite to the wind direction. However, the wind paddle  4 C produces a torque smaller than the torque produced by the wind paddle  4 A. In addition, the wind paddle  4 C produces a lift in the inward direction to add to the rotational force. 
         [0066]    As can be seen from the above description, with the wind power generator  1  according to this embodiment, the vertical rotation shaft  2  can efficiently rotate as the force conditions shown in  FIGS. 5 and 6  alternately occur, although the magnitude and direction of the rotational force produced by each wind paddle  4  vary with the rotation. Thus, regardless of the direction of the wind received, the wind power generator  1  can start rotating with reliability when the generator  1  is activated and can easily keep rotating during operation. For example, the wind power generator  1  can be started with a slight wind at a wind speed of 3 m/s or lower. 
         [0067]    Furthermore, since the vertical rotation shaft  2  floats in the shaft support by the action of the magnets, so that the frictional resistance by the shaft support  6  is reduced, and the wind power generator  1  can be more easily activated. 
         [0068]    As shown in  FIG. 2 , the vertical rotation shaft  2  transmits the rotational force to the rotation shaft  71  of the wind power generating motor  7  through the rotation transmission mechanism  8 . The wind power generating motor  7  generates electric power as the rotation shaft  71  rotates. 
         [0069]    Next, an arrangement involved with a solar photovoltaic function in the wind power generator  1  according to this embodiment will be described. 
         [0070]    The solar photovoltaic power generating elements  5  provided on the surfaces of the concave panel part  41  receive sunlight and generate electric power. According to this embodiment, the upper edge airflow stopping part  43  is transparent, so that light is transmitted through the upper edge airflow stopping part  43  to reach the outer surface  411  of the concave panel part  41 . In addition, the mirror-finished surfaces of the vertical rotation shaft  2  and the lower edge airflow stopping part  44  reflect sunlight to the outer surface  411  and the inner surface  412  of the concave panel part  41  to increase the amount of light received by the solar photovoltaic power generating elements  5 . 
         [0071]    Thus, the solar photovoltaic power generating elements  5  can efficiently receive more sunlight, and the wind power generator  1  according to this embodiment can efficiently generate electric power from sunlight. 
         [0072]    In addition, according to this embodiment, since the wind paddle  4  is vertically elongated, the wind paddle  4  can easily produces a lift, and the area available for installation of the solar photovoltaic power generating elements  5  increases, and therefore, the amount of generated electric power also increases. 
         [0073]    The electric power generated by the solar photovoltaic power generating elements  5  is fed to the solar photovoltaic charger  9  through the energizing mechanism  10 . More specifically, when the element-side positive electrode gear  101  and the shaft support-side positive electrode gear  103  come into contact with and are engaged with each other, a current can flow therebetween. Similarly, when the element-side negative electrode gear  102  and the shaft support-side negative electrode gear  104  come into contact with and are engaged with each other, a current can flow therebetween. Therefore, as shown in  FIG. 2 , the positive electrode  51  and the negative electrode  52  of the solar photovoltaic power generating element  5  forms one loop electric circuit, and a current generated by the solar photovoltaic power generating element  5  is accumulated in the solar photovoltaic charger  9  through the electric circuit. 
         [0074]    In addition, since the gears  103  and  104  on the side of the shaft support  6  are rotatable, the gears  103  and  104  can rotate with the element-side gears  101  and  102  and do not hinder the rotation of the vertical rotation shaft  2 . That is, if the solar photovoltaic power generating elements  5  and the solar photovoltaic charger  9  were connected by wire, such as cords, the cords would be entangled as the vertical rotation shaft  2  rotates. However, according to this embodiment, such a problem does not arise. 
         [0075]    The wind power generator  1  according to this embodiment described above has the following advantages. 
         [0076]    1. The wind power generator is configured to easily receive the drag of the wind in the rotational direction, so that the wind power generator can start operating with reliability when activated, and the amount of electric power generated using wind and sunlight as energy sources can be increased. 
         [0077]    2. Wind is concentrated on the front edge airflow reservoir part  42 , and the projected area in the wind direction is reduced to reduce the resistance to the rotation of the vertical rotation shaft  2 , thereby facilitating the rotation of the vertical rotation shaft  2 . 
         [0078]    3. The lift produced on the inner surface  412  of the wind paddle provides a force to assist the rotation of the vertical rotation shaft  2 . 
         [0079]    4. The size of the wind paddle  4  is increased, so that the lift and the amount of generated electric power are increased. 
         [0080]    5. Since gears are used for connection, cords or the like, which would be twisted and cut as the vertical rotation shaft  2  rotates, are unnecessary. 
         [0081]    6. Since the wind paddles  4  are supported with the outer surfaces  411  thereof facing outward, the space needed for installation thereof is reduced compared with the case where the wind paddles  4  are arranged with the longitudinal direction thereof aligned with the radial direction, and the wind power generator  1  can be easily installed on the roof floor of an office building or in a vacant lot next to a building, for example. 
         [0082]    7. Since the wind power generator  1  is made from light members, the rotational resistance due to the self-weight can be reduced. 
         [0083]    The wind power generator according to the present invention is not limited to the embodiment described above and can be modified as required. 
         [0084]    For example, although the gears of the energizing mechanism  10  and the gears of the rotation transmission mechanism  8  are separate gears in the embodiment described above, the energizing mechanism  10  and the rotation transmission mechanism  8  may share a gear. 
         [0085]    Furthermore, as shown in  FIG. 7 , a plurality of wind paddles  4  may be vertically coupled so that the curved panel part  41  according to this embodiment has a vertically elongated shape. 
         [0086]    Furthermore, as shown in  FIG. 8 , a company advertisement sign  64  may be installed on the upper end part of the vertical rotation shaft  2 . In that case, the electric power required by an illuminator  65  of the sign  64  can be sufficiently supplied, and any excessive electric power can be sold to an electric power company to gain a profit. 
       REFERENCE SIGNS LIST 
       [0000]    
       
           1  wind power generator 
           2  vertical rotation shaft 
           3  supporting arm 
           4  wind paddle 
           5  solar photovoltaic power generating element 
           6  shaft support 
           7  wind power generating motor 
           8  rotation transmission mechanism 
           8  solar photovoltaic charger 
           10  energizing mechanism 
           31  upper supporting arm 
           32  lower supporting arm 
           41  concave panel part 
           42  front edge airflow reservoir part 
           43  upper edge airflow stopping part 
           44  lower edge airflow stopping part 
           45  front edge part 
           46  rear edge part 
           47  upper edge part 
           48  lower edge part 
           49  airflow stopping hole 
           51  positive electrode 
           52  negative electrode 
           61  base part 
           62  shaft supporting part 
           63  ball bearing 
           64  sign 
           65  illuminator 
           66  magnet 
           67  socket 
           71  rotation shaft 
           81  motor-side gear 
           82  rotation shaft-side gear 
           91  positive electrode 
           92  negative electrode 
           101  element-side positive electrode gear 
           102  element-side negative electrode gear 
           103  shaft support-side positive electrode gear 
           104  shaft support-side negative electrode gear 
           411  outer surface 
           412  inner surface