1. TECHNICAL FIELD 
       [0001]    Embodiments of the present invention relate to a water floating-type solar photovoltaic power generator, and more particularly, to a water floating-type solar photovoltaic power generator which is easy to be manufactured, economical, and favorable to be rotated by using a plurality of annular floating bodies concentrically arranged around a main pillar as floating source and consisting of pipes of synthetic resin materials to support solar photovoltaic power generation equipments on the water. 
       2. DESCRIPTION OF RELATED ART 
       [0002]    Much research and developments have been made for eco-friendly power generation facilities that can obtain electricity by using environment-friendly energy while environmental pollution is being intensifying, and more particularly, there are conducted many researches to replace the electricity produced by conventional power generation facilities beyond the level of obtaining a small amount of electricity from solar power generation, wind power generation, geothermal power generation and so on. 
         [0003]    In this regard, the solar photovoltaic power generation facilities have come into wide use in recent years. In order to supplement the electric energy obtained from the existing power generation means through the above-described solar photovoltaic power generation facilities, there is a drawback in that the solar photovoltaic power generation facilities must be installed on a large scale, and thus, there is a problem that a wide flat ground is required for this. 
         [0004]    In order to solve this problem, there have been recently made much efforts and attempts to install such a solar photovoltaic power generation facility on the wide surface of water. 
         [0005]    A water floating type solar photovoltaic power generation facility is installed with a predetermined thickness and in a large area. Such a large-scaled water-floating solar photovoltaic power generation facility, which is normally consisting of a plurality of solar cell modules arranged in an equal interval and installed on a water-floating body which is made to be floated on the water surface with a predetermined size by mutually connecting a plurality of floats by a support, is easy to be shaken by waves as in the case that all kinds of floats installed on the water surface are easily shaken. While the position and the angle of receiving the sunlight are important for the solar power generation facility, it is not easy to fix the position and the angle of receiving the sunlight on the water surface, and it is still difficult to cope with the water level change effectively. There are many problems to be still solved such as a complicated sunlight tracking equipment in such a water-floating solar photovoltaic power generation facility, and so on. 
         [0006]    As the prior art, in Korean Patent Registration No. 10-1171000 (Publication date: Aug. 8, 2012) titled as Apparatus for tracking condensing sunlight of water floating type, the apparatus comprises a float object installed on a water surface; an upper structure formed in an inverted triangular shape at an upper end of the float object to form a space portion at a center thereof and having a rotation axis including a bearing at an upper end thereof; a solar module plate that condenses sunlight; a rotary plate in which the solar module plate is formed on an upper surface thereof and a center portion of a lower surface thereof is fixed to the upper end of the rotation axis to be rotated in a lateral direction; a roller guide formed in a space portion at the center of the upper structure and formed along a rotation radius around the rotation axis; a rotary pusher roller movably formed along the roller guide; each rotary pusher having one end fixed to both sides of the bottom surface of the rotary plate and the other end hinge-coupled to the rotary pusher roller; a motor formed on the float object; a rack pinion for converting the rotational motion of the motor into a linear motion; a driven pipe formed on the float object and coupled to the rack pinion to linearly move in the lateral direction; and a roller link having one end hinge-coupled to the driven pipe and the other end hinge-coupled to the rotary pusher roller to move the rotary pusher roller in rotation radius along the roller guide when the driven pipe moves horizontally. 
         [0007]    In the above-mentioned structure, the means for rotating the solar module plate is installed on the upper structure. Accordingly, since the rotation axis including the bearing is provided on the upper structure in order to install a large scale of the solar module plate, much power is needed, thereby causing many expenses for management, and furthermore, low economic efficiency caused by its complicated facility structure is considered problematic. 
         [0008]    As another prior art, in Korea Patent Publication No. 10-2013-0117306 (Publication date: Dec. 25, 2013) titled as Tracking Type floating PV System, the system comprises a fixed floating body having a predetermined size and floating on the water surface; a variable type support rope that fixes the fixed floating body in the state of being always tense even when the water level fluctuates; a rotating float body that is rotatable installed inside the fixed floating body and has a solar cell module mounted on a fixed frame on its upper side; a rotating means for rotating the rotating float body inside the fixed floating body; and a control unit for controlling for the rotating means to be rotated by a solar tracking sensor and a solar azimuth controller so that the solar tracking can be performed. 
         [0009]    However, in the above-mentioned prior art, since the rotating float body is integrally formed as a large disk, it is not easy for manufacture, and it is costly and requires large amounts of energy for rotation because its lower portion side is entirely in contact with water and it takes much load on rotation. 
       SUMMARY 
       [0010]    The present invention is directed to solve the problems of the conventional technology described as above, and embodiments of the present invention provide a water floating-type solar photovoltaic power generator which is easy to be manufactured, economical, and favorable to be rotated by using a plurality of annular floating bodies concentrically arranged around a main pillar as floating source and consisting of pipes of synthetic resin materials to support solar photovoltaic power generation equipments on the water. 
         [0011]    Further, embodiments of the present invention provide a water floating-type solar photovoltaic power generator which is accurate to be operated and easy to be manufactured by rotating annular floating bodies by using wires and a winding drum, and which is also easy to be installed by providing air injection and water discharge structure in a main pillar to be movable up and down by a user&#39;s operation. 
         [0012]    In accordance with an aspect of the present invention, there is provided a water floating-type solar photovoltaic power generator installed on the water which comprises a central pillar unit including a main pillar installed while being vertically protruded on the water; a central rotation member movable up and down along a height direction of the main pillar, and being supported by the main pillar so as to be movable around the main pillar; a plurality of annular floating bodies formed to be floated on the water surface and concentrically arranged around the main pillar; a base interconnecting the central rotation member and the plurality of annular floating bodies such that the central rotation member and the plurality of annular floating bodies are integrally movable up and down and rotatable and a space for solar photovoltaic power generation equipment is formed thereon; and the solar photovoltaic power generation equipments installed on the base and including solar cell panels, wherein the annular floating bodies are configured such that a plurality of pipes are made of synthetic resin materials and interconnected to form a singular closed curve. 
         [0013]    Further, the plurality of annular floating bodies may be classified into a first group of floating bodies disposed at the center portion, and a second group of floating bodies disposed outside the first group of floating bodies, and the annular floating bodies belonging to the first group of floating bodies are configured such that the plurality of pipes having a linear shape are interconnected via an elbow connection pipe to form a polygonal shape, and the annular floating bodies belonging to the second group of floating bodies are configured such that the plurality of the pipes are interconnected in a state bent by an external force to form a circular shape. 
         [0014]    Further, each of the pipes of the annular floating bodies may be formed in a hollow shape, and partition walls for sealing an internal space of the pipe may be inwardly formed at both ends of the connected pipes. 
         [0015]    Further, the water floating-type solar photovoltaic power generator of the present invention may further include a rotation driving unit for rotating the central rotation member and the annular floating bodies around the main pillar; and a central controlling unit for controlling the operation of the rotation driving unit such that the solar cell panels track the sun in accordance with solar azimuth. 
         [0016]    Further, the rotation driving unit may include a pair of wires each having one end connected to the opposite sides of the base or the annular floating bodies disposed at outmost side; and a winding drum disposed at outside of the base for winding or unwinding the other ends of a pair of the wires to be opposite from each other. 
         [0017]    Further, the central pillar unit may further include a plurality of anchors provided at the lower bottom surface of the annular floating bodies, and a holding rope for connecting the plurality of anchors and the main pillar such that the position of the main pillar is fixed on the water. 
         [0018]    Further, the main pillar may include an air pocket formed therein, a weight block having a predetermined weight positioned at the lower end thereof, and an inlet and an outlet to allow air or water to be injected into or discharged from the air pocket by a user&#39; operation such that the main pillar is vertically movable in the water. 
         [0019]    Further, the central pillar unit may further include a tension adjusting weight connected to the holding rope such that tension of the holding rope is maintained. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0020]      FIG. 1  is a perspective view of a water floating-type solar photovoltaic power generator in accordance with one embodiment of the present invention; 
           [0021]      FIG. 2  is a plane view of a water floating-type solar photovoltaic power generator in accordance with one embodiment of the present invention; 
           [0022]      FIGS. 3 and 4  are side views of a water floating-type solar photovoltaic power generator in accordance with one embodiment of the present invention; 
           [0023]      FIG. 5  is a side view of a main pillar in accordance with one embodiment of the present invention; 
           [0024]      FIG. 6  is a plane view of annular floating bodies in accordance with one embodiment of the present invention; 
           [0025]      FIG. 7  is a plane view of a water floating-type solar photovoltaic power generator in accordance with a second embodiment of the present invention; 
           [0026]      FIG. 8  is a plane view of a water floating-type solar photovoltaic power generator in accordance with a third embodiment of the present invention; and 
           [0027]      FIG. 9  is a plane view of a water floating-type solar photovoltaic power generator in accordance with a forth embodiment of the present invention. 
       
    
    
     DETAILED DESCRIPTION OF THE EMBODIMENTS 
       [0028]    The present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments of the present invention are shown. 
         [0029]      FIG. 1  is a perspective view of a water floating-type solar photovoltaic power generator in accordance with one embodiment of the present invention,  FIG. 2  is a plane view of a water floating-type solar photovoltaic power generator in accordance with one embodiment of the present invention,  FIGS. 3 and 4  are side views of a water floating-type solar photovoltaic power generator in accordance with one embodiment of the present invention,  FIG. 5  is a side view of a main pillar in accordance with one embodiment of the present invention, and  FIG. 6  is a plane view of annular floating bodies in accordance with one embodiment of the present invention. 
         [0030]    Referring to  FIGS. 1 to 6 , a water floating-type solar photovoltaic power generator  1  in accordance with one embodiment of the present invention includes a central pillar unit  10 , a central rotation member  20 , an annular floating body  30 , a base  40 , a solar photovoltaic power generation equipment  50 , a rotation driving unit  60 , and a central controlling unit  70 . 
         [0031]    The central pillar unit  10  functions as central axis of the water floating-type solar photovoltaic power generator of the present invention, and includes a main pillar  11 , an anchor  12 , a holding rope  13 , and a tension adjusting weight  14 . 
         [0032]    As shown in  FIG. 5 , the main pillar  11  is formed such that it is vertically protruded on the water and further is configured such that an air pocket  111  is formed therein, a weight block  112  with a predetermined weight is provided at its lower end to make the main pillar  11  maintain its balance, and an inlet  113  and an outlet  114  are provided to allow air or water to be injected into or discharged from the air pocket  111  by a user&#39;s operation such that in the semi-submersible state, in order to make the main pillar  11  being vertically movable on the water. 
         [0033]    While the main pillar  11  is being vertically protruded over the water, it is difficult to fit the main pillar  11  into the center of the central rotation member  20  with which the annular floating body  30  and the base  40  are interconnected, and therefore, while the main pillar  11  is pressed to be submerged into the water, the central rotation member  20 , the annular floating body  30 , and the base  40  are made to be assembled. After finishing the assembling, the main pillar  11  is then made to be movable up over the water, and the main pillar  11  is inserted into the center of the central rotation member  20 . 
         [0034]    For the way of allowing the main pillar  11  to be submerged into the water, it can be done by injecting water into the air pocket  111  through the inlet  113  so as to fill the air pocket  111  with water. On the contrary, in order to make the main pillar  11  floated up, it can be done by injecting air into the air pocket  111  through the inlet  113  so as to allow the water filling the air pocket  111  to be discharged from the outlet  114  and thereby to make the air pocket  111  being in a hollow state. 
         [0035]    Regarding the anchor  12 , there are a plural of anchors  12  installed under the annular floating bodies  30  on the lower side thereof. In particular, when the annular floating bodies  30  are descending down as the level of the water is decreased, the upper surface of the anchor  12  comes to contact the lower surface of the annular floating body  30  against to each other and support to each other. Preferably, the installation of the anchors  12  should be directed to make the facing annular floating body  30  well balanced, and it is also preferable that habitats for various kinds of aquatic plants and fish spawn are formed inside the water where the facility is located. 
         [0036]    That is, the water storage capacity of water reservoir or dam may be changed according to rainfall water volume and water usage amount, and furthermore, when being badly in need of rain in long drought, and the reservoir becomes dried, the annular floating bodies  30  cannot maintain their balancing state on the water and thus come down even to the bottom of the reservoir, resulting in damages and breakage of the solar photovoltaic power generation equipment  50 . Therefore, the anchors  12  provide the effect of preventing the breakage of the solar photovoltaic power generation equipment  50  in advance and sufficiently, and also usually function to provide effect of artificial reef for fish. 
         [0037]    The anchors  12  are preferably made of steel slag concrete which is more advantageous of making aquatic plants by accelerating photosynthesis of the aquatic plants in creating fish spawning ground and breeding ground. 
         [0038]    As shown in  FIGS. 3 and 4 , the anchor  12  and the main pillar  11  are connected by the holding rope  13  so as to fix the position of the main pillar  11  on the water. 
         [0039]    The holding rope  13  functions to fix the position of the main pillar  11  on the water by connecting the main pillar  11  and a plurality of the anchors  12  which are provided on the lower bottom surface of the main pillar  11 . 
         [0040]    The tension adjusting weight  14  is connected to the holding rope  13  such that the tension is maintained on the holding rope  13 . 
         [0041]    That is, the tension adjusting weight  14  prevents the holding rope  13  from being loosened in the case that the main pillar  11  sinks due to a decrease in the water level. 
         [0042]    The central rotation member  20  is movable up and down along a height direction of the main pillar  11 , and is supported by the main pillar  11  so as to be rotatable around the main pillar  11 . 
         [0043]    The annular floating body  30  is formed so to be floated on the water surface, and a plurality of the annular floating bodies  30  are arranged to concentrically around the main pillar  11 . 
         [0044]    By the configuration that the plurality of the annular floating bodies  30  are arranged concentrically, the contact area of the annular floating bodies  30  with the water surface is relatively smaller than that of a circular disk-shaped floating body so as to occur less load during rotation, and thus, the annular floating bodies  30  can be rotated with a small energy. 
         [0045]    Further, in one embodiment of the present invention, a plurality of pipes  31  made of synthetic resin such as PE pipe are provided to be connected to each other by the method of butt welding of pipe ends and the like to form a singular closed curve since the annular floating bodies  30  are relatively great in size and thus to facilitate manufacturing easier. 
         [0046]    In one embodiment of the present invention as shown in  FIG. 6 , the plurality of annular floating bodies  30  may be classified into a first group of floating bodies  30   a  displaced at a center portion and a second group of floating bodies  30   b  displaced outside the first group of floating bodies  30   a.    
         [0047]    The annular floating bodies  30  belonging to the first group of floating bodies  30   a  are configured such that the plurality of pipes  31  having a linear shape are interconnected through an elbow connection pipe  32  to form a polygonal shape. 
         [0048]    That is, it is difficult to form closed curves by bending the pipe  31  in the first group of floating bodies  30   a  since the diameter of the annular floating body in the first of group floating bodies  30   a  is relatively smaller than that of the annular floating body in the second group of floating bodies  30   b , and thus, the tool such as the elbow connection pipe  32  may be employed as intermediary for the connection to form closed curves. 
         [0049]    In one embodiment of the present invention, the annular floating body  30  displaced at the center of the first group of floating bodies  30   a  is formed to be a rectangular shape to facilitate easy manufacturing, and the annular floating bodies  30  outside the annular floating body  30  displaced at the center as above are configured to form an octagonal shape. 
         [0050]    Further, the annular floating bodies  30  belonging to the second group of floating bodies  30   b  are configured such that the plurality of pipes  31  are interconnected in a state bent by an external force to form a circular shape. 
         [0051]    That is, as the annular floating bodies  30  belonging to the second group of floating bodies  30   b  are greater in diameter, it can be bent by the external force to some extent, and thus the pipes  31  can be directly connected to each other without use of intermediary component such as the elbow connection pipe  32  unlike the structure of the first group of floating bodies  30   a.    
         [0052]    Further, in one embodiment of the present invention, each of the pipes  31  of the annular floating bodies  30  is formed to be hollow, and a partition wall  34  for sealing the internal space of the pipe  31  is inwardly formed from a connector  33  which is each formed at both ends of the pipes  31 . 
         [0053]    Owing to the structure of the partition wall  34 , the annular floating body  30  can keep its buoyancy even though the pipes  31  of the annular floating bodies  30  are partially damaged or water leakage occurs in the connector  33 , so as to maintain its stability. 
         [0054]    The base  40  is configured to connect the central rotation member  20  and the plurality of annular floating bodies  30 , and owing to the base  40 , the central rotation member  20  and the plurality of annular floating bodies  30  can be integrally movable up and down or rotated, and also the installation space for the solar photovoltaic power generation equipment can be provided thereon. 
         [0055]    The base  40  is preferably structured such that a transverse frame  41  and a longitudinal frame  42  are displaced as grid pattern in order to minimize its weight while providing the installation space for the solar photovoltaic power generation equipment thereon. 
         [0056]    The solar photovoltaic power generation equipment  50  is structured to convert solar energy to electric energy, and may include a solar cell panel  51 , a panel connect hinge  52 , a panel inclined support link  53 , and a check board  54 . 
         [0057]    The solar cell panel  51  is formed to condense sun light. 
         [0058]    Further, a sprinkler (not shown) may be installed in the solar cell panel  51 , in order to sprinkle water to the solar cell panel and thereby to decrease the temperature and ultimately increase the productivity and efficiency of the solar photovoltaic power generation. 
         [0059]    The panel connect hinge  52  is formed to connect the front end of the solar cell panel  51  to the base  40 , and the panel inclined support link  53  is formed to connect the back end of the solar cell panel  51  and the base  40  in order to make the solar cell panel  51  be supported by the base  40  while maintaining a predetermined inclined angle. 
         [0060]    The inclined angle of the solar cell panel  51  which is made by the panel inclined support link  53  is preferably around 27°. 
         [0061]    The check board  54  is formed in the base  40  with a predetermined width for a user to be capable of moving and passing by in order to check and inspect the solar cell panels  51  and so on. 
         [0062]    The rotation driving unit  60  is controlled by the central controlling part  70 , and configured to rotate the central rotation member  20  and the annular floating bodies  30  around the main pillar  11 . In one embodiment of the present invention, the rotation driving unit  60  may include a wire  61  and a winding drum  62 . 
         [0063]    The wire  61  may be formed of a pair of a first wire  611  and a second wire  612 , which are respectively connected at their one ends to the opposite facing sides of the base  40  or the annular floating bodies  30  which are disposed at outmost side. Meantime, the other ends of the first wire  611  and the second wire  612  are connected to the winding drum  62 . 
         [0064]    The winding drum  62  is disposed at the outer one side of the base  40 , and functions to wind or unwind the other ends of the pair of wires  61  toward the opposite from each other. 
         [0065]    That is, when the winding drum  62  winds the first wire  611 , it acts to unwind the second wire  612 , and when the winding drum  62  unwinds the first wire  611 , it acts to wind the second wire  612 . Thereby, the rotation driving unit  60  according to one embodiment of the present invention is controlled by the central controlling unit  70 , and can make the annular floating bodies  30  be rotated clockwise or counterclockwise in accordance with exact angle of solar azimuth, that is, predetermined time schedule. 
         [0066]    The central controlling unit  70  functions to control the operation of the rotation driving unit  60  such that the solar cell panels  51  can track the sun in accordance with solar azimuth. 
         [0067]    As described above, the water floating-type solar photovoltaic power generator according to one embodiment of the present invention has been described. Hereinafter, a water floating-type solar photovoltaic power generator according to a second, a third, and a fourth embodiment will be described in reference to  FIGS. 7 to 9 . 
         [0068]    The second embodiment of  FIG. 7  shows the embodiment in that two water floating-type solar photovoltaic power generators ( 1  and  1 ′) of the present invention are interlocked, a third embodiment of  FIG. 8  shows the embodiment in that three water floating-type solar photovoltaic power generators ( 1 ,  1 ′ and  1 ″) of the present invention are interlocked, and a fourth embodiment of  FIG. 9  shows the embodiment in that four water floating-type solar photovoltaic power generators ( 1 ,  1 ′,  1 ″ and  1 ′″) of the present invention are interlocked. 
         [0069]    That is, the water floating-type solar photovoltaic power generator according to the present invention may be installed on the water independently as in a first embodiment of the present invention as above, and a plurality of the water floating-type solar photovoltaic power generators may be installed to be interlocked as in a second to a fourth embodiment. 
         [0070]    As described and illustrated as above with reference to the drawings, the water floating-type solar photovoltaic power generator according to the present invention is illustrative of one embodiment to show the present invention, and is not to be construed as limiting thereof. Although a few embodiments have been described, those skilled in the art will readily appreciate that many modifications are possible without materially departing from the novel teachings and advantages. Accordingly, all such modifications are intended to be included within the scope of this present invention as defined in the claims. In the claims, means-plus-function clauses are intended to cover the structures described herein as performing the recited function, and not only structural equivalents but also equivalent structures. 
       INDUSTRIAL APPLICABILITY 
       [0071]    The water floating-type solar photovoltaic power generator according to the present invention as structured above is advantageous for easy manufacturing by the structure of the plurality of annular floating bodies consisting of the synthetic resin pipes and being arranged to form concentric circles and economical and furthermore, advantageous in rotation. 
         [0072]    Further, the water floating-type solar photovoltaic power generator according to the present invention as structured above is advantageous in accurate operation and easy manufacturing by rotating the annular floating bodies by using the wires and the winding drum, and also advantageous in easy installation by providing the structure of air injection and water discharge in the main pillar so as to be movable up and down by a user&#39;s operation.
The present invention relate to a water floating-type solar photovoltaic power generator, and more particularly, to a water floating-type solar photovoltaic power generator which is easy to be manufactured by using a plurality of annular floating bodies; is economical; and is further favorable to rotation, the plurality of annular floating bodies consisting of synthetic pipes and being arranged to form a concentric circle on the basis of a main pillar, as a floating source for supporting solar photovoltaic generation equipment on the water.