WO2017038336A1

WO2017038336A1 - Wave power generation device

Info

Publication number: WO2017038336A1
Application number: PCT/JP2016/072320
Authority: WO
Inventors: 齊藤　靖; 弘行上野; 小倉　雅則; 菅原　亮; 雅一中里
Original assignee: Ｋｙｂ株式会社
Priority date: 2015-09-02
Filing date: 2016-07-29
Publication date: 2017-03-09
Also published as: CN107709759A; KR20180008653A; JP2017048730A; TW201713852A

Abstract

Provided is a wave power generation device capable of efficiently using water flow and generating power. The wave power generation device comprises a float (10), a water wheel (40), and a power generation device (60). The float (10) is housed inside a water-retarding chamber (R) of a slit-type breakwater (70), so as to freely move up and down. The slit-type breakwater (70) has a front wall section (72) that connects the water-retarding chamber (R) formed therein and the outside and has formed therein a slit-shaped front opening (72A) that extends vertically. The water wheel (40) is rotatably suspended from the float (10). The power generation device (60) generates power as a result of the rotation of the water wheel (40).

Description

Wave power generator

The present invention relates to a wave power generator.

Patent Document 1 discloses a conventional wave power generator installed on a breakwater installed on a quay. The breakwater has a front wall. The front wall is formed with a front opening that communicates the water chamber formed inside the breakwater with the outside. The front opening has a slit shape extending in the vertical direction with the breakwater installed on the quay. This wave power generation device includes a water wheel that is rotatably arranged in a water-reservoir chamber, and a power generation device that generates electricity when the water wheel rotates. The water turbine has a rotating shaft extending in the vertical direction between the upper wall portion and the lower wall portion of the breakwater. The power generator is connected to the rotating shaft of the water turbine and is placed on the upper wall of the breakwater. In this wave power generation device, the water turbine rotates by the flow of water flowing into and out of the water reserving chamber through the slit-shaped front opening, and can generate electric power.

JP 2013-2410 A

However, in the wave power generation device of Patent Document 1, the water turbine is disposed at a predetermined position in the water-reservoir chamber. For this reason, in this wave power generation device, the water turbine is exposed from the water surface when the tide is pulled and the water level is lowered. In this case, the water flow is received by only a part of the water wheel, the water wheel cannot be efficiently rotated, and the power generation device cannot efficiently generate power. In addition, if the upper end of the water turbine is positioned at a position lower than the water level when the tide is lowered and the water level is lowered most, the vertical dimension of the water turbine is reduced, so that the water flow can be efficiently received. The power generation device cannot efficiently generate power.

The present invention has been made in view of the above-described conventional situation, and an object to be solved is to provide a wave power generation device that can generate power by efficiently using the flow of water.

The wave power generation device of the present invention includes a float, a water wheel, and a power generation device. The float is stored in a sluice chamber of a slit type breakwater so that it can move up and down. The slit-type breakwater has a front wall portion in which a reserving water chamber formed inside communicates with the outside, and a slit-shaped front opening extending in the vertical direction is formed. The water wheel is suspended from the float. The power generator generates power when the water wheel rotates.

The wave power generator of the present invention may include a support member that extends downward from the float and rotatably supports the lower end of the water turbine.

In the wave power generator of the present invention, the power generator can be provided in the float.

The wave power generator of the present invention may include a fluid pressure cylinder device and a fluid pressure motor. This fluid pressure motor has one end connected to the float, and expands and contracts by the vertical movement of the float. The fluid pressure motor is driven by the fluid supplied and discharged by the expansion and contraction of the fluid pressure cylinder device. The power generation device can generate power by rotating a fluid pressure motor.

In the wave power generation device of the present invention, the float may have a height difference on the lower surface, and may have a first lower surface and a second lower surface formed at a position higher than the first lower surface. The water wheel can be suspended from the second lower surface.

It is the vertical sectional view which looked at the wave power generator of Embodiment 1 from the horizontal direction. It is the vertical sectional view which looked at the wave power generator of Embodiment 1 from the front. It is the perspective view which looked at the wave power generator of Embodiment 1 from the upper part. It is a horizontal sectional view of the wave power generator of Embodiment 1. It is the schematic which shows the hydraulic circuit which drives the electric power generating apparatus of Embodiment 1.

Embodiment 1 that embodies the wave power generation device of the present invention will be described with reference to the drawings.

<Embodiment 1>
The wave power generation device of Embodiment 1 includes a float 10, a fluid pressure cylinder device 20, a lid member 30, a water wheel 40, a support member 50 of the water wheel 40, and a power generation device 60, as shown in FIGS. Yes. As shown in FIGS. 1 to 4, this wave power generator is assembled to a block 71 constituting a slit type breakwater 70 which is a structure. The slit type breakwater 70 is formed by continuously installing a plurality of blocks 71 along the quay. The block 71 has a general structure constituting the slit type breakwater 70. That is, the block 71 has a rectangular parallelepiped shape whose outer shape is long along the quay when installed on the quay. Further, the block 71 includes a front wall portion 72, left and right wall portions 73, a rear wall portion 74, a bottom wall portion 75, and a plurality of partition walls 76 that partition an internal space surrounded by the plurality of water chambers R. ing.

As shown in FIGS. 1 and 2, the front wall portion 72 is exposed above the water surface at high tide with the block 71 installed on the quay. The front wall 72 forms three slit-shaped front openings 72A extending in the vertical direction with respect to a single water chamber R in a state where the block 71 is installed on the quay. The three front openings 72A provided for one water chamber R have the same shape, and are arranged in parallel one by one in the left-right direction from the front opening 72A at the center of the left and right. In addition, the three front openings 72A provided for one reserving chamber R have a front opening 72A at the left and right center disposed at the left and right center of the reserving chamber R. Each front opening 72A has an upper end higher than the water level at high tide and a lower end lower than the water level at low tide. Thus, at least a part of each front opening 72A is always open in water.

The left and right wall portions 73 and the partition wall portions 76 are formed at equal intervals. For this reason, the plurality of water chambers R formed in the block 71 have a rectangular parallelepiped shape that is long in the vertical direction and have the same volume. In addition, the left and right wall portions 73 and the partition wall portion 76 are formed with a lateral opening 73A that communicates with the adjacent water chamber R. The rear wall portion 74 closes the quay side of the reclaimed water chamber R in a state where the block 71 is installed on the quay. The bottom wall portion 75 closes the lower side of the drinking water chamber R in a state where the block 71 is installed on the quay. The upper side of the water reserving chamber R is open. That is, the block 71 forms an upper opening 71U that opens in the vertical direction for each of the water reserving chambers R.

A wave power generation device is attached to each recreational water chamber R. One float 10 is stored in each of the water reserving chambers R formed in the block 71. The float 10 has a hollow structure and has an upper surface 11, a lower surface 12, a front side surface 13, a rear side surface 14, and left and right side surfaces 15. As shown in FIG. 3, the float 10 has a quadrangular shape whose outer shape is slightly smaller than that of the water reserving chamber R when viewed from above.

Further, as shown in FIG. 1, the float 10 has a concave portion 11C in which the upper surface 11 is recessed downward. The concave portion 11C is the left and right center of the float 10, and is provided slightly closer to the rear wall 74 than the front and rear center. Here, the left and right front and rear sides of the float 10 are the left and right front and rear as viewed from the front wall 72 side of the float 10 housed in the water reserving chamber R. In the float 10, the upper surface around the recess 11C is the first upper surface 11A, and the bottom surface of the recess 11C is the second upper surface 11B. As described above, the float 10 has a difference in height on the upper surface 11 and includes the first upper surface 11A and the second upper surface 11B formed at a position lower than the first upper surface 11A. The second upper surface 11B, which is the bottom surface of the recess 11C, connects one end of the fluid pressure cylinder device 20 described later (the end of the rod (rod) 23). Thus, the float 10 can be made into an efficient layout by arranging the fluid pressure cylinder device 20 on the rear side and arranging the water wheel 40 described later on the front side. Moreover, since the float 10 is provided with the recessed part 11C which connects one edge part of the fluid pressure cylinder apparatus 20 in the vicinity of the gravity center position, it is easy to take a balance.

Further, as shown in FIGS. 1 and 3, the float 10 has a communication hole 11 H communicating with the internal space on the first upper surface 11 A. The float 10 has a lid 16 that closes the communication hole 11H. The float 10 can remove the lid 16 and inject water into the internal space. For this reason, this float 10 can adjust buoyancy by adjusting a weight with the quantity of the water inject | poured into internal space. Further, the float 10 can finely adjust the buoyancy by injecting seawater or the like in the immediate vicinity at the time of installation. In addition, the float 10 is light and can be easily transported because water is not injected into the internal space during transport. The lid 16 is always attached to the float 10 member and closes the communication hole 11H.

Further, as shown in FIG. 1, the float 10 has a step (level difference) formed on the lower surface 12 and is formed at a position higher than the first lower surface 12A on the rear side and the first lower surface 12A on the front side. And a lower surface 12B. That is, the float 10 has a front end portion 10A on the front side (front wall portion 72 side) that has a thin thickness in the vertical direction (the interval between the upper surface 11 and the lower surface 12 is narrow). The float 10 forms an insertion passage 10B in which a rotation shaft 41 of a water wheel 40 described later is rotatably inserted in the front end portion 10A. As shown in FIGS. 1 to 3, the insertion path 10B extends in the vertical direction at the approximate center of the front end portion 10A on the left and right and front and rear. The water wheel 40 is suspended from the second lower surface 12B through the insertion shaft 10B formed in the front end portion 10A of the float 10 through the rotation shaft portion 41.

Also, as shown in FIGS. 1 to 4, the float 10 has a pair of rollers 17 attached to the front side surface 13 and the rear side surface 14 of the front end portion 10A. The pair of rollers 17 are attached at a predetermined interval in the left-right direction. Each roller 17 is rotatable around a rotation axis that is parallel to the front side surface 13 and the rear side surface 14 and extends in the horizontal direction. The pair of rollers 17 attached to the front side surface 13 is attached to the surface of the front wall 72 of the block 71 on the side of the water reserving chamber R and moves on a pair of rails 72R extending in the vertical direction. The pair of rollers 17 attached to the rear side surface 14 is attached to the surface of the rear wall 74 of the block 71 on the side of the water reserving chamber R, and moves on a pair of rail tops 74R extending in the vertical direction. In this way, the float 10 is housed in the water reserving chamber R formed in the block 71, and is guided to move up and down in accordance with changes in the water level without shifting in the left-right direction and the front-rear direction. That is, the float 10 moves up and down smoothly according to the change in the water level without colliding with the front wall portion 72, the left and right wall portions 73, the rear wall portion 74, and the partition wall portion 76 of the block 71. be able to.

As shown in FIGS. 1 and 5, the fluid pressure cylinder device 20 includes a cylinder 21, a piston 22, a rod 23, and a rod guide (not shown). The cylinder 21 has a bottomed cylindrical shape. The rod guide seals the opening of the cylinder 21. The piston 22 is slidably inserted into the cylinder 21. The piston 22 partitions the inside of the cylinder 21 into a rod side chamber 21A and a piston side chamber 21B. The rod side chamber 21A and the piston side chamber 21B are filled with a working fluid. The rod side chamber 21A and the piston side chamber 21B communicate with a working fluid circulation passage 63 described later. The rod 23 is connected to the piston 22 at the base end, is inserted through the rod guide, and protrudes to the outside of the cylinder 21 at the distal end side.

As shown in FIG. 1, the fluid pressure cylinder device 20 has a second upper surface that is a bottom surface of a recess 11 C in which a tip portion of the rod 23 (one end portion of the fluid pressure cylinder device 20) is formed on the upper surface 11 of the float 10. 11B is connected via a ball joint 23A. In the fluid pressure cylinder device 20, the bottom portion of the cylinder 21 (the other end portion of the fluid pressure cylinder device 20) is connected to a second back surface 31B of a lid member 30 described later via a ball joint 23B.

As shown in FIGS. 1 and 2, the lid member 30 is provided separately for each water chamber R and closes the upper opening 71 U in which the block 71 is opened. As shown in FIG. 3, the lid member 30 has a quadrangular shape whose outer shape is larger than the upper opening 71 U opened for each of the water reserving chambers R when viewed from above. The lid member 30 forms a recess 30 C in which the back surface 31 is recessed upward. The recess 30C is connected to the float 10 and is formed at a position where the upper part of the cylinder 21 of the fluid pressure cylinder device 20 rising in the vertical direction can be inserted. In the lid member 30, the back surface 31 around the recess 30C is the first back surface 31A, and the bottom surface of the recess 30C is the second back surface 31B. As described above, the lid member 30 has a difference in height on the back surface 31 and includes the first back surface 31A and the second back surface 31B formed at a position higher than the first back surface 31A. Further, the lid member 30 forms a convex portion 32C in which the surface 32 of the portion where the concave portion 30C is formed protrudes upward.

As shown in FIGS. 1, 2, and 4, the water wheel 40 includes a rotating shaft portion 41 and a rotating blade portion 42 formed around the rotating shaft portion 41. The rotation shaft portion 41 is inserted through the insertion passage 10 B of the float 10 and has an upper end protruding above the upper surface 11 of the front end portion 10 A of the float 10.

The rotary wing portion 42 has two fixing members 42A and a pair of wing members 42B. Each fixing member 42 A has a disk shape, and the rotation shaft portion 41 passes through the center. Each of the pair of wing members 42B is formed of a semi-cylindrical member. The rotary blade 42 is formed by fixing a pair of blade members 42B between the fixed members 42A fixed to the rotary shaft 41 with the rotary shaft 41 symmetrical. Thus, the water wheel 40 is a Savonius type water wheel and rotates in one direction.

The support member 50 of the water wheel 40 is formed of channel steel as shown in FIGS. 1 and 2. The support member 50 includes an upper horizontal portion 51, a vertical portion 52, and a lower horizontal portion 53. The upper horizontal portion 51 is inserted through the rotating shaft portion 41 of the water wheel 40 and is fixed to the second lower surface 12B of the float 10 by extending in the front-rear direction. The vertical portion 52 continues to the rear edge of the upper horizontal portion 51 and extends in the vertical direction. The vertical portion 52 is fixed to the front side surface 13 that connects the first lower surface 12A and the second lower surface 12B of the float 10 at the upper end portion. The lower horizontal portion 53 is continuous with the lower end edge of the vertical portion 52 and extends in the horizontal direction in the same direction as the upper horizontal portion 51. The lower horizontal portion 53 has a bearing member 53 A on the upper surface, and rotatably supports the lower end portion of the rotating shaft portion 41 of the water wheel 40. In this way, the support member 50 of the water wheel 40 extends downward from the float 10 and rotatably supports the lower end of the water wheel 40.

As shown in FIG. 5, the power generation device 60 includes a fluid pressure pump 61, a fluid pressure cylinder device 20, a tank 62, a circulation flow path 63, a fluid pressure motor 64, a generator 65, and a power It is composed of a power conditioner 66. As shown in FIGS. 1 and 2, the fluid pressure pump 61 is attached to the upper surface 11 of the front end portion 10 A of the float 10, and the rotary shaft portion 61 A is connected to the upper end portion of the rotary shaft portion 41 of the water wheel 40. As shown in FIG. 5, the fluid pressure pump 61 has an outflow port 61S through which the working fluid flows out and an inflow port 61N through which the working fluid flows in. The fluid pressure pump 61 supplies and discharges the working fluid in one direction.

The tank 62 stores a working fluid, and the stored working fluid is pressurized by air. The tank 62 is attached on the first upper surface 11 A of the float 10. The fluid pressure motor 64 and the generator 65 are attached to the first upper surface 11A of the float 10 behind the recess 11C in which the fluid pressure cylinder device 20 is inserted and attached. The fluid pressure motor 64 has an outflow port 64S through which the working fluid flows out and an inflow port 64N through which the working fluid flows in. The fluid pressure motor 64 supplies and discharges the working fluid in one direction. The fluid pressure motor 64 and the generator 65 are connected to respective

rotary shaft portions

64A and 65A. For this reason, when the fluid pressure motor 64 rotates, the generator 65 generates power.

As shown in FIG. 5, in the circulation channel 63, the working fluid flowing out from the outflow port 64S of the fluid pressure motor 64 receives the first check valve 63A, the tank 62, the filter 63E, the fluid pressure pump 61, the second The flow path flows in the order of the check valve 63B and flows into the inflow port 64N of the fluid pressure motor 64.

In this wave power generation device, when the fluid pressure cylinder device 20 contracts, the working fluid flows out from the piston side chamber 21B, and the working fluid flows into the inflow port 64N of the fluid pressure motor 64 via the third check valve 63C. As a result, the working fluid circulates in the circulation channel 63. At this time, since the fluid pressure cylinder device 20 contracts and the capacity of the rod side chamber 21A increases, the working fluid flows from the tank 62 to the rod side chamber 21A via the first connection channel 67A.

Further, in this wave power generation device, when the fluid pressure cylinder device 20 is extended, the working fluid flows out from the rod side chamber 21A, and the working fluid flows into the tank 62, whereby the working fluid circulates in the circulation passage 63. At this time, since the fluid pressure cylinder device 20 expands and the capacity of the piston side chamber 21B increases, the tank 62 also operates from the tank 62 to the piston side chamber 21B via the second connection channel 67B provided with the fourth check valve 63D. Fluid flows.

As described above, the wave power generation device is configured such that when the hydraulic cylinder device 20 expands and contracts by the vertical movement of the water level caused by the tide and the vertical movement of the water level caused by the wave, the fluid pressure cylinder device 20 expands and contracts. The working fluid circulates through the path 63. As a result, the fluid pressure motor 64 rotates and the generator 65 generates electricity. At this time, since the working fluid flows through the fluid pressure pump 61, the fluid pressure pump 61 also rotates.

Further, in this wave power generation device, when the water wheel 40 is rotated by the flow of water flowing into and out of the water reserving chamber R through the slit-shaped front opening 72A, the fluid pressure pump 61 is rotated and the circulation flow path 63 is rotated. The working fluid circulates. Also by this, in this wave power generation device, the fluid pressure motor 64 rotates and the generator 65 generates power.

The power conditioner 66 is connected to the generator 65 and converts the electricity generated by the DC generator so that it can be used at home. The power conditioner 66 is mounted on the first upper surface 11A of the float 10. As described above, the power generation device 60 (the fluid pressure pump 61, the fluid pressure cylinder device 20, the tank 62, the circulation channel 63, the fluid pressure motor 64, the generator 65, and the power conditioner 66) is provided in the float 10.

As described above, the wave power generation device of the first embodiment includes the float 10, the water wheel 40, and the power generation device 60. The float 10 is accommodated in the water chamber R of the slit breakwater 70 so as to be movable up and down. The slit-type breakwater 70 has a front wall portion 72 in which a reserving water chamber R formed inside communicates with the outside and a slit-shaped front opening 72A extending in the vertical direction is formed. The water wheel 40 is suspended from the float 10 so as to be rotatable. The power generation device 60 generates power when the water wheel 40 rotates.

Since this wave power generator suspends the water wheel 40 from the float 10, the water wheel 40 can always be present in the water regardless of changes in the water level due to the tide. For this reason, in this wave power generation device, the water turbine 40 efficiently receives the flow of water and is rotated without being affected by the change in the water level due to the tide, and the power generation device 60 can generate power. Further, in this wave power generation apparatus, since the water wheel 40 is always present in the water, organisms such as shells are hardly attached to the water wheel 40, and rust is difficult to proceed. For this reason, this wave power generation device can be rotated by the water wheel 40 efficiently receiving the flow of water for a long period of time, and the power generation device 60 can generate electric power, and the labor of maintenance can be reduced.

Therefore, the wave power generation apparatus of Embodiment 1 can generate power by efficiently using the flow of water.

The wave power generator includes a support member 50 that extends downward from the float 10 and rotatably supports the lower end of the water wheel 40. For this reason, this wave power generator can rotate the water wheel 40 satisfactorily.

In this wave power generation device, the power generation device 60 is provided in the float 10. For this reason, in this wave power generation device, since the power generation device 60 moves up and down together with the float 10, the power generation device 60 can generate power without being affected by a change in the water level due to tide fullness.

This wave power generation device includes a fluid pressure cylinder device 20 that expands and contracts by the vertical movement of the float 10, and the power generation device 60 generates power when the fluid pressure cylinder device 20 expands and contracts. For this reason, in this wave power generation device, even if the flow of water flowing into and out of the reserving water chamber R through the front opening 72A is weak, the float 10 moves up and down due to the up and down movement of the water level due to tide fullness and the like. Then, the fluid pressure cylinder device 20 can expand and contract, and the power generation device 60 can generate power. In addition, this wave power generation device can use the energy as an auxiliary torque when starting up the water turbine 40 as long as the fluid pressure cylinder device 20 is in a state of expansion and contraction.

This wave power generation device has a height difference formed on the lower surface 12 of the float 10, and has a first lower surface 12A and a second lower surface 12B formed at a position higher than the first lower surface 12A. The water wheel 40 is suspended from the second lower surface 12B. For this reason, this wave power generator can lengthen the vertical length of the water turbine 40. Therefore, the wave power generation device has a larger area for receiving the water flow of the water wheel 40, and the water wheel 40 efficiently receives the water flow and rotates, so that the power generation device 60 can generate power.

In this wave power generator, the float 10 is housed in a slit-type breakwater 70 having a front wall portion 72 in which a front opening 72A is formed, and is guided to move up and down. For this reason, in this wave power generation device, the float 10 accommodated in the slit type breakwater 70 receives the flow of water and water flowing in and out from the front opening 72A. For this reason, in this wave power generation device, the float 10 receives force from a specific direction, and the float 10 is difficult to receive excessive wave force or water flow. Further, in this wave power generation apparatus, the float 10 can smoothly move up and down in the slit type breakwater 70 according to the vertical movement of the water level. For this reason, this wave power generation device can move the float 10 up and down not only according to the vertical movement of the water level due to tides but also according to the vertical movement of the water level due to waves. Therefore, in this wave power generation device, the fluid pressure cylinder device 20 expands and contracts with a small stroke due to the vertical movement of the water level due to waves, and the fluid pressure cylinder device 20 expands and contracts with a large stroke due to the vertical movement of the water level due to tide fullness. It can generate electricity.

Also, this wave power generator has a function as a breakwater. For this reason, this wave power generation device can prevent the float 10, the fluid pressure cylinder device 20, the water wheel 40, and the power generation device 60 from being damaged by the wave force or the water flow. The wave power generator can be attached to an existing slit type breakwater 70 to generate power. Thus, this tidal power generation apparatus does not need to bother to make a structure (caisson) and can use the existing slit type breakwater 70.

Further, in this wave power generation device, since water flows in and out through the slit-shaped front opening 72A, the fluctuation of the water level due to the waves becomes large in the reclaimed water chamber R. For this reason, this wave power generator can generate electric power efficiently because the vertical movement of the float 10 due to the waves is large. In addition, since this wave power generation device has a slit shape in which the front opening 72A extends in the vertical direction, it is difficult for a large floating substance to pass through the front opening 72A, and a large floating substance in the structure (the recreational water chamber R). Can be prevented from entering. For this reason, since a big floating substance does not contact the float 10, the intensity | strength improvement of the float 10 is not required.

Further, this wave power generation device includes a lid member 30. In the fluid pressure cylinder device 20, the tip (one end) of the rod 23 is connected to the float 10, and the bottom (the other end) of the cylinder 21 is connected to the lid member 30. The lid member 30 closes the upper opening 71U that opens in the vertical direction with the slit type breakwater 70 installed on the quay. For this reason, since this wave power generation device blocks the upper opening 71U of the slit-type breakwater 70 with the lid member 30, it is possible to prevent a person or an object from falling into the drinking water chamber R. Further, in this wave power generation device, in order to expand and contract the fluid pressure cylinder device 20 by the vertical movement of the float 10, the float 10 housed in the slit type breakwater 70 (flood chamber R) and the slit type breakwater 70 It is suitable to connect the fluid pressure cylinder device 20 between the lid member 30 arranged on the upper part.

The lid member 30 has a first back surface 31A and a second back surface 31B formed at a position higher than the first back surface 31A. The fluid pressure cylinder device 20 connects the bottom portion (the other end portion) of the cylinder 21 to the second back surface 31B. For this reason, since this wave power generation device can lengthen the stroke of the fluid pressure cylinder device 20, the fluid pressure cylinder device 20 follows the water level variation even if the water level variation due to tide fullness is large. Can expand and contract and generate electricity.

The float 10 has a hollow structure, a communication hole 11H communicating with the internal space is formed on the upper surface 11, and a lid 16 that closes the communication hole 11H. For this reason, this wave power generator can adjust buoyancy by putting water in the float 10 and adjusting the weight. Thereby, this wave power generation device can easily attach the fluid pressure cylinder device 20. In addition, this wave power generation device allows the fluid pressure cylinder device 20 to expand and contract satisfactorily and generate power efficiently. Further, the float 10 can finely adjust the buoyancy by injecting seawater or the like in the immediate vicinity at the time of installation. In addition, the float 10 is light and can be easily transported because water is not injected into the internal space during transport.

The float 10 has a height difference formed on the upper surface 11, and has a first upper surface 11A and a second upper surface 11B formed at a position lower than the first upper surface 11A. And the fluid pressure cylinder apparatus 20 has connected the front-end | tip part (one edge part) of the rod 23 to the 2nd upper surface 11B. For this reason, since this wave power generation device can lengthen the stroke of the fluid pressure cylinder device 20, the fluid pressure cylinder device 20 follows the water level variation even if the water level variation due to tide fullness is large. Can expand and contract and generate electricity. Further, the tip (one end) of the rod 23 of the fluid pressure cylinder device 20 is connected to the second upper surface 11B formed at a position lower than the first upper surface 11A even for a breakwater with a height restriction. Thus, the stroke length of the fluid pressure cylinder device 20 can be maximized and used effectively.

The present invention is not limited to the first embodiment described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.
(1) Although the fluid pressure cylinder device is provided in the first embodiment, the fluid pressure cylinder device may not be provided.
(2) In the first embodiment, there is one fluid pressure cylinder device, but a plurality of fluid pressure cylinder devices may be incorporated. In this case, if the four fluid pressure cylinder devices are connected to the four corners of the float, the float moves up and down stably and the balance is good. Further, if a plurality of fluid pressure cylinder devices are incorporated, rattling during expansion and contraction of the fluid pressure cylinder device can be suppressed and the life can be extended.
(3) Although the lid member is provided in the first embodiment, the lid member may not be provided.
(4) In Embodiment 1, the height difference is formed on the back surface of the lid member, but the height difference may not be formed on the back surface of the lid member. In this case, no convex portion is formed on the surface of the lid member.
(5) In the first embodiment, the float has a hollow structure, the communication hole is formed, and the lid that closes the communication hole is provided. However, the float may not have the hollow structure. Moreover, even if it is a float of a hollow structure, it is not necessary to form a communicating hole.
(6) Although the height difference is formed on the upper surface of the float in the first embodiment, the height difference may not be formed on the upper surface of the float.
(7) In the first embodiment, the power generation device is mounted on the first upper surface of the float. However, the power generation device may be provided in the float. In this case, salt damage to the power generation device can be prevented or deterioration can be suppressed.

DESCRIPTION OF SYMBOLS 10 ... Float, 11A ... 1st upper surface, 11B ... 2nd upper surface, 11H ... Communication hole, 12A ... 1st lower surface, 12B ... 2nd lower surface, 16 ... Lid, 20 ... Fluid pressure cylinder apparatus, 30 ... Lid member, 31A ... 1st back surface, 31B ... 2nd back surface, 40 ... Water wheel, 50 ... Supporting member, 60 ... Power generation device, 64 ... Fluid pressure motor, 70 ... Slit breakwater (structure), 72 ... Front wall, 72A ... Front Opening, R ... Reservoir

Claims

The water play chamber formed inside communicates with the outside and is housed in the water play chamber of a slit-type breakwater having a front wall portion formed with a slit-like front opening extending in the vertical direction so as to be movable up and down. Float,
A water wheel suspended rotatably on the float;
A power generation device that generates electricity by rotating the water wheel;
A wave power generation device comprising:
The wave power generator according to claim 1, further comprising a support member that extends downward from the float and rotatably supports a lower end of the water turbine.
The wave power generation device according to claim 1 or 2, wherein the power generation device is provided in the float.
A fluid pressure cylinder device having one end connected to the float and extending and contracting by the vertical movement of the float;
A fluid pressure motor driven by fluid supplied and discharged by expansion and contraction of the fluid pressure cylinder device;
With
The wave power generation device according to claim 1, wherein the power generation device generates power by rotating the fluid pressure motor.
The float has a height difference formed on a lower surface, and has a first lower surface and a second lower surface formed at a position higher than the first lower surface,
The wave power generation device according to claim 1 or 2, wherein the water wheel is suspended from the second lower surface.
A fluid pressure cylinder device having one end connected to the float and extending and contracting by the vertical movement of the float;
A fluid pressure motor driven by fluid supplied and discharged by expansion and contraction of the fluid pressure cylinder device;
With
The wave power generation device according to claim 3, wherein the power generation device generates power by rotating the fluid pressure motor.
The float has a height difference formed on a lower surface, and has a first lower surface and a second lower surface formed at a position higher than the first lower surface,
The wave power generation device according to claim 3, wherein the water wheel is suspended from the second lower surface.
The float has a height difference formed on a lower surface, and has a first lower surface and a second lower surface formed at a position higher than the first lower surface,
The wave power generator according to claim 4, wherein the water wheel is suspended from the second lower surface.
The float has a height difference formed on a lower surface, and has a first lower surface and a second lower surface formed at a position higher than the first lower surface,
The wave power generator according to claim 6, wherein the water wheel is suspended from the second lower surface.