Abstract:
A seesaw-type wave power generating device ( 1 ) includes: a first buoy ( 10 ); a second buoy ( 20 ) disposed on one side of the first buoy ( 10 ); an impeller generator ( 30 ) disposed between the first buoy ( 10 ) and the second buoy ( 20 ); a first connecting pipe ( 42 ) having both ends communicated with the first buoy ( 10 ) and the impeller generator ( 30 ); and a second connecting pipe ( 42 ) having both ends communicated with the second buoy ( 20 ) and the impeller generator ( 30 ). A liquid ( 2 ) is filled in the first buoy ( 10 ) and the second buoy ( 20 ). The first buoy ( 10 ) and the second buoy ( 20 ) bob on the water and water waves ( 4 ) causes the liquid ( 2 ) to flow back and forth between the first connecting pipe ( 41 ) and the second connecting pipe ( 42 ), thereby driving the impeller generator ( 30 ) to generate electricity. The present invention is easy for implementation and maintenance.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a water power generating device, in particular to a wave power generating device. 
     2. Description of Prior Art 
     Since the amount of petroleum stored all over the world is limited and the global warming is getting serious, many nations in the world have already paid attention to develop new power-generating technology by using renewable energies and inexhaustible natural resources (such as solar power, wind power and ocean power) because they have lower impact on the earth environment. 
     Wave power generation is a power-generating technology for generating electricity by using ocean wave power, which has low impact on the earth environment and it is inexpensive and safe. According to the estimation made by resource experts, 0.1 percentage of the dynamic energy of the ocean wave can generate five times the amount of electricity necessary for the whole world. Thus, it is very worthy to develop the technology of ocean power generation. Especially in island countries, costal areas usually have continuous waves caused by monsoons. Therefore, the continuous waves can be used to generate a large amount of electricity. 
     Taiwan Patent No. I313319 and 499543 disclose a wave power generating device for converting the dynamic energy of the ocean waves into electricity. The wave power generating device disclosed in these patent documents is fixed on a support. Buoys are configured to drive a telescopic pump. The telescopic pump generates air to drive a pneumatic impeller for generating electricity. However, the telescopic pump and the support may suffer damage easily due to the lash of ocean waves, which makes the telescopic pump unable to generate air stably. On the other hand, since the wave power generating device is disposed in the ocean, the maintenance is uneasy. Further, the density of air is much smaller than that of the water, so that the dynamic energy of compressed air is much less than that of moving water. As a result, such a small dynamic energy of compressed air merely generates a limited amount of electricity and its power-generating efficiency is insufficient and uneconomical. 
     In view of the above, the present Inventor proposes a novel and reasonable structure in order to solve the above-mentioned problems based on his research and expert knowledge. 
     SUMMARY OF THE INVENTION 
     The present invention is to provide a seesaw-type wave power generating device, which floats on the water for easy maintenance. 
     The present invention is to provide a seesaw-type wave power generating device, which has a simple structure for easy implementation. 
     The present invention provides a seesaw-type wave power generating device, in which a liquid is filled. The wave power generating device includes a first buoy, a second buoy, an impeller generator, a first connecting pipe and a second connecting pipe. The second buoy is disposed on one side of the first buoy with an interval. The impeller generator is disposed between the first buoy and the second buoy. One end of the first connecting pipe is in communication with the first buoy, and the other end thereof is in communication with the impeller generator. One end of the second connecting pipe is in communication with the second buoy, and the other end thereof is in communication with the impeller generator. The liquid is filled in the first buoy and the second buoy. The first buoy and the second buoy bob on the water and water waves causes the liquid to flow back and forth between the first connecting pipe and the second connecting pipe, thereby driving the impeller generator to generate electricity. 
     In comparison with prior art, the seesaw-type wave power generating device according to the present invention has a plurality of buoys floating on the water, so that the maintenance thereof is easy. Since the seesaw-type wave power generating device according to the present invention bobs due to water waves, the liquid moves back and forth between the first buoy and the second buoy. When the liquid moves from one buoy to the other buoy, the moving liquid drives the impeller generator to rotate, thereby generating electricity. Thus, the present invention has a simple structure for easy implementation. Further, check valves may be provided in the intersecting portions between the buoys and the connecting pipes to open or close in an alternate manner, thereby making the impeller generator to rotate continuously for generating electricity. Thus, the present invention really demonstrates an improved practicability. 
    
    
     
       BRIEF DESCRIPTION OF DRAWING 
         FIG. 1  is a perspective view showing an external appearance of a first embodiment in accordance with the present invention; 
         FIG. 2  is a perspective view showing an external appearance of a second embodiment in accordance with the present invention; 
         FIG. 3  is a top view of  FIG. 2 ; 
         FIG. 4  is a side view of  FIG. 2 ; 
         FIG. 5  is a schematic view showing the device of the present invention; 
         FIG. 6  is a schematic view (I) showing a condition of the present invention in which the first buoy is located in a higher position; 
         FIG. 7  is a schematic view (II) showing a condition of the present invention in which the second buoy is located in a higher position; 
         FIG. 8  is a schematic view (I) showing a condition of the present invention in which the second buoy is located in a higher position; 
         FIG. 9  is a schematic view (II) showing a condition of the present invention in which the second buoy is located in a higher position; 
         FIG. 10  is a schematic view of the present invention; and 
         FIG. 11  is a schematic view showing the operation of the device according to a third embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     The detailed description and technical contents of the present invention will become apparent with the following detailed description accompanied with related drawings. It is noteworthy to point out that the drawings is provided for the illustration purpose only, but not intended for limiting the scope of the present invention. 
     Please refer to  FIG. 1 , which is a schematic view showing the external appearance of the seesaw-type wave power generating device according to the first embodiment of the present invention. The seesaw-type wave power generating device  1   a  of the present invention includes a first buoy  10 , a second buoy  20 , an impeller generator  30 , a first connecting pipe  41  and a second connecting pipe  42 . 
     Each of the first buoy  10  and the second buoy  20  has a hollow casing. The second buoy  20  is disposed on one side of the first buoy  10  at an interval. The impeller generator  30  is disposed between the first buoy  10  and the second buoy  20 . 
     The first connecting pipe  41  is in communication with the first buoy  10  and the impeller generator  30 . The second connecting pipe  42  is in communication with the second buoy  20  and the impeller generator  30 . One end of the first connecting pipe  41  is in communication with the first buoy  10 , and the other end thereof is in communication with the impeller generator  30 . One end of the second connecting pipe  42  is in communication with the second buoy  20 , and the other end thereof is in communication with the impeller generator  30 . 
     The seesaw-type wave power generating device la includes a control box  50 . The control box  50  comprises a control module and a power storage unit (not shown). The power storage unit is electrically connected to the impeller generator  30  for storing the electricity generated by the impeller generator  30  from the dynamic energy of the waves. The control box  50  may be disposed in the first buoy  10  or the second buoy  20 . Alternatively, the control box  50  may be provided adjacent to the first buoy  10  or the second buoy  20 . The impeller generator  30  is supported on a fixing support  60  connected between the first buoy  10  and the second buoy  20 . 
     Please refer to  FIGS. 2 to 4 , which are a perspective view, a top view and a side view showing the seesaw-type wave power generating device according to the second embodiment of the present invention respectively. The second embodiment is a preferred embodiment of the present invention and is substantially the same as the first embodiment. The difference between the second embodiment and the first embodiment lies in that: the seesaw-type wave power generating device  1  has a third connecting pipe  81  and a fourth connecting pipe  82 . One end of the third connecting pipe  81  is in communication with the first buoy  10 , and the other end thereof is in communication with the impeller generator  30 . One end of the fourth connecting pipe  82  is in communication with the second buoy  20 , and the other end thereof is in communication with the impeller generator  30  and the third connecting pipe  81 . The impeller generator  30  is provided at the intersecting portions of these connecting pipes  41 ,  42 ,  81  and  82 . In the present embodiment, the first connecting pipe  41 , the second connecting pipe  42 , the third connecting pipe  81 , and the fourth connecting pipe  82  are arranged in an X-shaped structure. However, those skilled in this art may contemplate that the arrangement of these connecting pipes may be suitably changed according to practical demands. 
     A first check valve  411  is provided in an intersecting portion between the first connecting pipe  41  and the first buoy  10 . A second check valve  421  is provided between an intersecting portion between the second connecting pipe  42  and the second buoy  20 . The orientation of the first check valve  411  when it is opened is identical to that of the second check valve  421 . Further, a third check valve  811  is provided in an intersecting portion between the third connecting pipe  81  and the first buoy  10 . A fourth check valve  821  is provided between an intersecting portion between the fourth connecting pipe  82  and the second buoy  20 . The orientation of the third check valve  811  when it is opened is identical to that of the fourth check valve  821 , but is reverse to that of the first check valve  411  or the second check valve  421 . Further, an anchoring element  90  is provided under the first buoy  10  and the second buoy  20 . The anchoring element  90  is used for anchoring the seesaw-type wave power generating device  1 . Further, the interiors of the first buoy  10  and the second buoy  20  are filled with a liquid  2 . 
     Please refer to  FIG. 1 , which is a schematic view showing the seesaw-type wave power generating device of the present invention. An end of a hawser  91  is fastened to the anchoring element  90  of the device  1 , and the other end thereof is fastened to a weight  3  (or a foundation built on a riverbed or seabed). With this arrangement, the seesaw-type wave power generating device  1  bobs on the water, whereby the impeller generator  30  can generate electricity. 
       FIGS. 6 to 9  are schematic views showing the operation of the seesaw-type wave power generating device of the present invention. Please refer to  FIGS. 6 and 7  first. The first buoy  10  and the second buoy  20  bob on the water  4 . When the fist buoy  10  is located at a higher position than the second buoy  20 , the first check valve  411  and the second check valve  421  are opened, so that the liquid  2  in the first buoy  10  flows through the first connecting pipe  41  to lash the impeller generator  30  to cause its rotation, and flows into the first connecting pipe  42  and then the second buoy  20 . Please refer to  FIGS. 8 and 9 . When the second buoy  20  is located at a higher position than the first buoy  10 , the third check valve  811  and the fourth check valve  821  are opened, so that the liquid  2  in the second buoy  20  flows through the third connecting pipe  81  to lash the impeller generator  30  to cause its rotation in a direction identical to the above, and flows into the fourth connecting pipe  82  and then the first buoy  10 . In this way, the impeller generator  30  can rotate continuously to generate electricity. The electricity generated thereby is stored in the control box  50  for subsequent use. 
     Please refer to  FIG. 10 , which is a schematic view showing the application of the seesaw-type wave power generating device of the present invention. According to the present invention, a plurality of devices  1  can be connected in series to generate a large amount of electricity. 
     Please refer to  FIG. 11 , which shows the third embodiment of the seesaw-type wave power generating device of the present invention. The third embodiment is substantially the same as the first embodiment. The difference between the third embodiment and the first embodiment lies in that the first connecting pipe  41 ′ and the second connecting pipe  42 ′ are provided therein with two flowing channels, and a plurality of valves is provided to control the entrance of water. The intersecting portion between the first connecting pipe  41 ′ and the impeller generator  30 ′ is provided with two check valves  411 ′ and  412 ′. Similarly, the intersecting portion between the second connecting pipe  42 ′ and the impeller generator  30 ′ is provided with two check valves  421 ′ and  422 ′. The orientation of the check valve  411 ′ when it is opened is identical to that of the check valve  421 ′. The orientation of the check valve  412 ′ when it is opened is identical to that of the check valve  422 ′, but is reverse to that of the check valve  411 ′ or  421 ′. 
     Although the present invention has been described with reference to the foregoing preferred embodiments, it will be understood that the invention is not limited to the details thereof. Various equivalent variations and modifications can still occur to those skilled in this art in view of the teachings of the present invention. Thus, all such variations and equivalent modifications are also embraced within the scope of the invention as defined in the appended claims.