Wave-power electricity generating device

Abstract

[Problem] To provide a revolutionary wave-power electricity generating device capable of enhancing electricity generation efficiency by a simple means and excellent in miniaturization, mass productivity, cost, etc. [Solution] This wave-power electricity generating device comprises a floating part 2, an impeller part 3 that rotates in water due to vertical movement of the floating part 2, and an electricity generation part 5 that generates electricity from the rotation of a blade part 6 of the impeller part 3. The wave-power electricity generating device has a configuration in which a container part 8 accommodating the blade part 6, which moves up and down together with the floating part 2, is provided in a stationary state, and the blade part 6 moves up and down in close proximity to a peripheral wall part 9 inside the container part 8 in conjunction with the up and down movement of the floating part 2, thereby catching water inside the container part 8 and rotating to generate electricity efficiently.

Description

Wave power generation device

[0001] The present invention relates to a wave power generation device that utilizes waves to generate electricity by causing, for example, the blades of a turbine section to descend and rotate underwater due to the vertical movement of a floating section, and generating electricity in a power generation section by this rotation.

[0002] There are various methods for wave power generation that utilize waves. A wave power generation method has been proposed that includes a floating section that moves up and down due to waves, a turbine section provided with blades that descend and rotate underwater due to the vertical movement of the floating section, and a power generation section in which a power generation rotating section rotates in a magnetic field and generates electricity due to the rotation of the rotation axis of the blades of the turbine section.

[0003] That is, it is a wave power generation device that converts the energy of the vertical movement of waves into rotational energy in the turbine section and transmits this rotational energy to a power generation section (generator) to convert it into electrical energy (generate electricity). Specifically, for example, when the floating section descends due to waves, the blades of the turbine section also rotate underwater while descending, causing the rotation axis of the turbine section to rotate. As a result, a wave power generation device has been proposed in which the power generation rotating section of the power generation section rotates in a magnetic field to generate electricity.

[0004] However, even such wave power generation devices are not excellent in terms of power generation efficiency, mass productivity, cost, etc., and further research and development are required.

[0005] In view of such a situation, the present invention is based on new ideas and principles, and can improve power generation efficiency by simple means. It is excellent in terms of miniaturization, mass productivity, cost, etc., easy to install a large number, and can easily transmit a large amount of power efficiently. The purpose is to provide a revolutionary wave power generation device with extremely excellent practicality.

[0006] The gist of the present invention will be described with reference to the accompanying drawings.

[0007] The present invention is a wave power generation device comprising a floating section 2 that moves up and down with the up and down movement of the water surface 1 caused by waves, a vane section 3 that rotates by moving up and down in the water due to the up and down movement of the floating section 2, and a power generation section 5 that generates electricity by the rotation of the rotation shaft 4 of the vane section 3, wherein when the floating section 2 moves up and down with waves, the blade section 6 of the vane section 3 rotates in the water while moving up and down, causing the rotation shaft 4 of the vane section 3 to rotate, which in turn causes the power generation rotating section 7 of the power generation section 5 to rotate, thereby generating electricity, and a container section 8 for housing the blade section 6 of the vane section 3 that moves up and down with the up and down movement of the floating section 2 due to waves, This wave power generation device is characterized in that the container 8 is provided in a stationary or fixed state, surrounding the blade 6 which moves up and down in water, and the inner diameter of the peripheral wall 9 is slightly larger than the outer diameter of the blade 6 of the impeller 3, so that the blade 6 moves up and down in close proximity to the peripheral wall 9 in the water inside the container 8, and when the blade 6 of the impeller 3 moves up and down in water inside the container 8, the blade 6 moves up and down in close proximity to the peripheral wall 9 inside the container 8, so that it receives water inside the container 8 and rotates, causing the power generation rotating part 7 of the power generation unit 5 to rotate and generate electricity.

[0008] Furthermore, the wave power generation device comprises a floating section 2 that moves up and down with the up and down movement of the water surface 1 caused by waves, a vane section 3 that rotates by moving up and down in the water due to the up and down movement of the floating section 2, and a power generation section 5 that generates electricity by the rotation of the rotation shaft 4 of the vane section 3, wherein when the floating section 2 moves up and down with waves, the blade section 6 of the vane section 3 rotates in the water while moving up and down, causing the rotation shaft 4 of the vane section 3 to rotate, and the power generation rotating section 7 of the power generation section 5 to rotate, thereby generating electricity, and is equipped with a volume-changing container section 20 whose volume changes in conjunction with the up and down movement of the blade section 6 of the vane section 3 due to the up and down movement of the floating section 2 with waves, and the volume-changing container section 20 is configured such that even when the volume changes in conjunction with the up and down movement of the blade section 6 of the vane section 3, the blade section 6 is located in the outer upper part or inner upper part of the volume-changing container section 20. This wave power generation device is characterized in that, in conjunction with the vertical movement of the blade portion 6 of the impeller portion 3 in water, the volume of the volume-changing container portion 20 decreases, and as a result of this volume reduction in the volume of the volume-changing container portion 20, the blade portion 6 receives the water that is outside or inside the container portion and rotates, causing the power generation rotating portion 7 of the power generation portion 5 to rotate and generate electricity.

[0009] Furthermore, the present invention relates to a wave power generation device according to claim 1 or 2, characterized in that the container portion 8 or a part of the volume-changing container portion 20 is provided on an underwater mounting portion 10 or underwater bottom or an underwater mounting portion 10 provided on the underwater bottom or an underwater fixing member or an underwater mounting portion 10 provided on a fixing member, and is provided in an underwater state that is stationary or fixed to be stationary, and the floating portion 2 is provided on the mounting portion 10 or the underwater bottom or the underwater fixing member via a floating portion guide mechanism 13 so as to be able to move up and down, and the impeller portion 3 is suspended from the floating portion 2, and the blade portion 6 of the impeller portion 3 moves up and down together with the floating portion 2 due to the waves.

[0010] Furthermore, the wave power generation device according to claim 1 is characterized in that the container portion 8 is configured as a bottomed cylindrical container with an open top, and the blade portion 6 of the impeller portion 3 is housed in close proximity to the cylindrical peripheral wall portion 9 so as to be able to move up and down along the peripheral wall portion 9.

[0011] Furthermore, the volume-changing container section 20 is configured as a bottomed cylindrical container with an open top that can change volume, and when the volume-changing container section 20 shrinks in volume in conjunction with the downward movement of the blade section 6 of the impeller section 3, the blade section 6 is located either outside or inside the volume-changing container section 20, and the blade section 6 receives the water that becomes outside or inside the container section due to this volume reduction and rotates, which is a characteristic of the wave power generation device according to claim 2.

[0012] Furthermore, the present invention relates to a wave power generation device according to claim 1 or claim 2, characterized in that the container portion 8 or the volume-changing container portion 20, which is provided in whole or in part in a stationary state or in a fixed state fixed to be stationary, is configured to be expandable or replaceable, and the position of the wing portion 6 within the container portion 8 or the position of the wing portion 6 relative to the volume-changing container portion 20 is configured to be adjustable.

[0013] Furthermore, the present invention relates to a wave power generation device according to claim 1 or 2, characterized in that it is provided with a means 11 for assisting the downward or upward movement of the impeller section 3 by vertical movement of the impeller section 3.

[0014] Furthermore, the wave power generation device according to claim 1 or 2 is characterized in that it is provided with a mass increasing means 12 that increases the mass of the floating part 2 or the impeller part 3 when the floating part 2 moves up and down due to waves.

[0015] Furthermore, the wave power generation device according to claim 1 is characterized in that the gap between the peripheral wall portion 9 of the container portion 8 and the tip portion of the blade portion 6 of the impeller portion 3 is set to be 1 / 10 or less of the outer diameter of the blade portion 6.

[0016] Furthermore, even if the volume of the volume-changing container 20 changes in conjunction with the vertical movement of the blade portion 6 of the impeller portion 3, the blade portion 6 is located in the outer upper part close to the upper edge of the volume-changing container 20 or in the inner upper part close to the upper edge of the volume-changing container 20, as described in claim 2.

[0017] Furthermore, when the volume-changing container 20 undergoes a volume reduction change to a smaller volume, the outer diameter of the wing portion 6 located on the outer upper or inner upper part of the volume-changing container 20 is set to be slightly larger in diameter, equal in diameter, or slightly smaller in diameter than the outer diameter of the volume-changing container 20, which is a characteristic feature of the wave power generation device according to claim 10.

[0018] Furthermore, the wave power generation device according to claim 1 or 2 is characterized in that it is provided with an impeller vertical movement guide mechanism 14 that guides the impeller portion 6 of the impeller portion 3 to move up and down.

[0019] As the present invention is configured as described above, it is possible to increase power generation efficiency by simple means, and it is also superior in terms of miniaturization, mass productionability, and cost, and it is easy to install in large numbers and easily transmit large amounts of power efficiently, making it an extremely practical and groundbreaking wave power generation device.

[0020] This is a schematic diagram illustrating the configuration of the impeller section when it is moving upward in Example 1. This is a schematic diagram illustrating the configuration of the impeller section when it is moving downward in Example 1. This is a schematic diagram illustrating the configuration of the impeller section during its downward movement in Example 1. This is a schematic diagram illustrating the configuration of Example 2. This is a schematic diagram illustrating the configuration of the impeller section when it is moving upward in Example 3. This is a schematic diagram illustrating the configuration of the impeller section when it is moving downward in Example 3. This is a schematic diagram illustrating the configuration of the impeller section when it is moving downward in Example 4. This is a schematic diagram illustrating the configuration of the impeller section when it is moving downward in Example 4. This is a schematic diagram illustrating the configuration of the impeller section when it is moving downward in Example 4. This is a schematic diagram illustrating the configuration of the impeller section when it is moving downward in Example 5. This is a schematic diagram illustrating the configuration of the impeller section when it is moving upward in Example 6. This is a schematic diagram illustrating the configuration of the impeller section when it is moving downward in Example 6. This is a schematic diagram illustrating the configuration of the impeller section when it is moving downward in Example 7. This is a schematic diagram illustrating the configuration of the impeller section when it is moving downward in Example 7. This is a schematic diagram illustrating the configuration of the impeller section when it is moving downward in Example 7. This is a schematic diagram illustrating the configuration of the impeller section in Example 8 when it is moving upward. This is a schematic diagram illustrating the configuration of the impeller section in Example 8 when it is moving downward.

[0021] A preferred embodiment of the present invention will be briefly described with reference to the drawings, illustrating the operation of the present invention.

[0022] The floating part 2, which floats on the water surface 1 and moves up and down with the vertical movement of the water surface 1 caused by waves, moves downward, for example, due to waves. In this case, the blade part 6 of the impeller part 3 attached to the floating part 2 also moves downward in the water, and this downward movement (descent) in the water causes the blade part 6 to rotate as it receives water. The rotation of the rotation shaft 4 of the blade part 6 of the impeller part 3 causes the power generation rotating part 7 of the power generation unit 5 to rotate, for example, in a magnetic field, thereby generating electricity. It should also be configured to rotate and generate electricity and rectify even when moving upward, or to rotate in the forward direction when rotating in the reverse direction due to upward movement, thereby generating electricity even when moving upward, or to rotate but not generate electricity when moving upward, or to not rotate and not generate electricity.

[0023] In a wave power generation device of this type, the invention described in claim 1 is configured such that the housing portion 8, which houses the blade portion 6 of the vertically moving impeller portion 3, is provided in a stationary state or in a fixed state that is fixed to remain stationary. This stationary state includes a so-called quasi-stationary state where the housing portion is located deeper than the water surface 1 and hardly moves up and down even when the floating portion 2 and impeller portion 3 move up and down due to waves. The blade portion 6 is surrounded by this housing portion 8 and moves up and down within this housing portion 8, but unlike the blade portion 6, it is stationary. The fixed state means that it is fixed to a fixing member and is in a fixed state, and the same effects as the stationary state are produced.

[0024] The container portion 8 is configured such that the inner diameter of the peripheral wall portion 9 is set to be slightly larger than the outer diameter of the blade portion 6 of the impeller portion 3, and the blade portion 6 moves up and down together with the floating portion 2 due to the waves while in close proximity to the peripheral wall portion 9 within the container portion 8.

[0025] Therefore, within the submerged container 8, the blade 6 of the impeller 3 moves up and down, i.e., downwards or upwards, in close proximity to the peripheral wall 9 inside the container 8, causing it to rotate within the water. Since the blade 6 moves up and down in close proximity to the peripheral wall 9 inside the container 8, which is approximately the same diameter (slightly larger), when the blade 6 moves downwards due to the wave-induced vertical movement, much of the water below the blade 6 (in front of the blade 6's movement) passes over the blade 6 without avoiding it (the blade 6 receives water with minimal leakage), effectively acting as power to rotate the blade 6, thus improving power generation efficiency.

[0026] Experiments were conducted by varying the gap between the tip of the wing section 6 and the peripheral wall section 9 of the container section 8, and it was demonstrated that the smaller the gap, the higher the amount of electricity generated.

[0027] For example, if this gap is made to be less than 1 / 10 of the outer diameter of the wing section 6, it was confirmed that the amount of power generated increases dramatically and the power generation efficiency improves compared to when the wing moves up and down within the large container section 8.

[0028] Furthermore, the container unit 8 only needs to be installed in the aforementioned stationary state or a fixed state that is set to remain stationary, making it easy to manufacture and install, allowing for mass production and enabling the installation of many units to generate a large amount of power. However, as mentioned above, if a resistance plate is installed deep underwater as the mounting part 10, even if the floating part 2 moves up and down due to waves, that is, even if the water surface 1 is agitated, the resistance plate in the water will hardly move and will remain stationary (or semi-stationary). Therefore, by utilizing this principle and installing the container unit 8 on the mounting part 10, and for example, by installing the floating part 2, which is equipped with a buoyancy guide mechanism 13, on the mounting part 10 so that it can move up and down, the container unit 8 can be set to a stationary state and the floating part 2 and buoyancy part 3 can move up and down due to waves simply by being dropped into the water and allowed to float, thus realizing a wave power generation device that is extremely easy to install.

[0029] Therefore, since it is not necessary to provide the mounting part 10 on the structure or the underwater bottom, it becomes an extremely practical wave power generation device that is even easier to manufacture and install. Of course, the container part 8 may be fixed to the structure (underwater fixing member) or the underwater bottom or to the mounting part 10 thereon, or it may be attached to an underwater floating body connected to the mounting part 10, fixing member or underwater bottom (this floating body will oscillate if a large force such as a tide is applied), and the container part 8 may be attached to such a mounting part 10 which remains stationary even when the water surface 1 is oscillating with waves.

[0030] Furthermore, in the invention described in claim 2, a portion of the volume-changing container 20 (for example, the bottom) is provided in a stationary state in the water or fixed in a stationary state so as to move up and down in conjunction with the up and down movement of the wing portion 6 of the impeller portion 3 due to the up and down movement of the floating portion 2 by waves, thereby changing the volume of the container.

[0031] The volume-changing container 20 is configured such that its volume changes in conjunction with the vertical movement of the blade portion 6 due to waves. For example, its volume decreases (it shrinks) in conjunction with the downward movement (downward movement) of the blade portion 6. Furthermore, the volume changes such that even when the blade portion 6 of the impeller portion 3 moves up and down, the blade portion 6 is always located in the upper outer or upper inner part of the volume-changing container 20.

[0032] Therefore, in the invention described in claim 2, when the blade 6 moves up and down in water, for example, in conjunction with the downward movement of the blade 6, the volume of the volume-changing container 20 decreases as a result of the volume-changing container 20's volume reduction. The blade 6 receives the water that becomes outside or inside the container due to this volume reduction and rotates, causing the power generation rotating part 7 of the power generation unit 5 to rotate and generate electricity. In other words, since the blade 6 in the water rotates at an external upper or internal upper position of the volume-changing container 20, much of the water below the blade 6 (in front of the movement of the blade 6) passes through the blade 6 without avoiding it (the blade 6 receives water with minimal leakage) and effectively acts as power to rotate the blade 6, thus improving power generation efficiency.

[0033] For example, if the blade portion 6 is configured to rotate while moving downward near the area directly above or near the inner upper edge of the volume-changing container portion 20, and the outer diameter of the blade portion 6 is made slightly larger than, equal to, or slightly smaller than the inner diameter of the volume-changing container portion 20, then water outside or inside the volume-changing container portion 20 will pass through the blade portion 6 with minimal leakage and be received by the blade portion 6, thereby increasing the amount of electricity generated and improving the power generation efficiency.

[0034] Furthermore, the volume-changing container section 20, like the invention described in claim 1 above, only needs to be provided with a part of it (for example, the bottom) in a stationary state or a fixed state that is set to be stationary. It is easy to manufacture and install, can be mass-produced, and can be installed in large numbers to transmit a large amount of power. However, if a resistance plate is provided as a mounting part 10 deep in the water, even if the floating part 2 moves up and down due to waves, that is, even if the water surface 1 is agitated, the resistance plate in the water will hardly move and will remain in a stationary state (quasi-stationary state). Therefore, by utilizing this principle and providing the volume-changing container section 20 on the mounting part 10 with at least a part of it in a stationary state, and by providing the floating part 2, which is equipped with a buoyancy guide mechanism 13, on the mounting part 10 so that it can move up and down, a part of the volume-changing container section 20 (for example, the bottom) can be provided in a stationary state, and the floating part 2 and buoyancy guide mechanism 13 can be provided on the mounting part 10 so that they can move up and down due to the up and down movement of the waves, it is possible to realize a wave power generation device that is extremely easy to install.

[0035] Specific embodiments of the present invention will be described with reference to the drawings.

[0036] In this embodiment (Embodiment 1) shown in Figures 1 to 3, a floating section 2 floats on the water surface 1 and moves up and down with the vertical movement of the water surface 1 caused by waves. A wing section 3 equipped with a blade section 6 (a rotating impeller that receives water) that rotates as the floating section 2 moves down or up in the water due to the vertical movement of the floating section 2 is suspended from the floating section 2. A power generation unit 5 is provided on the floating section 2, in which a power generation rotating part 7 rotates in a magnetic field due to the rotation of the rotation shaft 4 of the wing section 3 and generates electricity. For example, when the floating section 2 descends due to waves, the blade section 6 of the wing section 3 receives water as it descends and rotates in the water, causing the rotation shaft 4 of the wing section 3 to rotate, and the power generation rotating part 7 of the power generation unit 5 to rotate in a magnetic field and generate electricity.

[0037] In this embodiment, the container portion 8 may be provided on a mounting portion 10 that is positioned to remain stationary even when the floating portion 2 moves up and down, for example, on a fixed member in the water, on the underwater bottom itself, or on a mounting portion 10 attached to these and positioned to remain stationary. Alternatively, a resistance plate is provided that is positioned at a deep location in the water to remain stationary (or semi-stationary), and this is used as the mounting portion 10, or the mounting portion 10 is provided on this resistance plate, and the container portion 8 is provided on this stationary mounting portion 10.

[0038] Specifically, a floating section 2 is provided on the stationary mounting section 10 in the water, via a floating section guide mechanism 13 so as to be able to move up and down. A turbine section 6 is suspended from the floating section 2, with a blade section 6 (a turbine that rotates by receiving water as it moves in the water) attached to the lower end of the rotating shaft 4, and a power generation section 5 (generator) is also provided. A container section 8 is provided on this mounting section 10.

[0039] In other words, unlike the floating section 2, impeller section 3, and power generation section 5 which move up and down due to the waves, this wave power generation device has a mounting section 10 that is stationary (or semi-stationary), and a housing section 8 that accommodates the blade section 6 of the impeller section 3 which moves up and down.

[0040] In this embodiment, the container 8 employs a bottomed cylindrical container with an open top, and the inner diameter of the peripheral wall 9 is set to be slightly larger than the outer diameter of the blade 6 of the impeller 3, and the blade 6 is housed in close proximity within the container 8, and the blade 6 moves up and down in close proximity along the peripheral wall 9, so that the blade 6 rotates efficiently by descending or ascending in close proximity to the peripheral wall 9 in the water inside the container 8.

[0041] Specifically, the container 8 is configured to be installed on a mounting part 10 in the water, which is stationary as described above. The floating part 2 is mounted on the mounting part 10 via a floating part guide mechanism 13 so as to be able to move up and down. The floating part 2 is equipped with a power generation unit 5 (a generator is mounted on it) and a vane part 3 is attached vertically. The wing part 6, which is provided at the lower end of the vane part 3 that moves up and down together with the floating part 2, is configured to move up and down in close proximity to the peripheral wall part 9 in the water inside the container 8 when it is stationary.

[0042] Therefore, for example, when the floating part 2 descends due to the up and down movement caused by waves, the wing part 6 of the impeller part 3 will descend underwater and receive water to rotate. The rotation of the rotating shaft 4 of the impeller part 3 causes the power generation rotating part 7 of the power generation part 5 to rotate, for example, in a magnetic field to generate electricity. However, in this embodiment, since the wing part 6 moves up and down in the water in the container part 8 in a state close to the peripheral wall part 9, (for example, when the wing part 6 descends, this wing part 6 descends in the container part 8 in a state close to the peripheral wall part 9), most of the water below the wing part 6 (the front of the movement of the wing part 6) will pass by avoiding the wing part 6 and (receiving this water with less leakage) effectively act as the power to rotate the wing part 6. Therefore, the power generation efficiency will be improved.

[0043] When experiments were conducted by changing the gap between the tip of the wing part 6 and the peripheral wall part 9 of the container part 8, it was also demonstrated that the smaller this gap is, the higher the power generation amount.

[0044] Therefore, for example, if this gap is set to 1 / 4 or less of the outer diameter of the wing part 6, the power generation efficiency will increase compared to the case where there is no container part 8 or when the container part 8 is large. Furthermore, it was also confirmed that if it is set to 1 / 10 or less, the power generation amount will increase dramatically and the power generation efficiency will increase.

[0045] That is, when the wing part 6 descends and rotates, when rotating in the ocean, lake water, or a large and wide container part, most of the water in front of the wing part 6 will escape to the outside and will not become the power to rotate the wing part 6. However, by accommodating the wing part 6 in the container part 8 in a state close to it, it was found that the water will pass through the wing part 6 without escaping and the power generation amount will be improved. Furthermore, by adopting a configuration in which the wing part 6 is accommodated in the container part 8 in a closer state where the gap is even narrower as described above, it was found that most of the water in the front is surrounded by the peripheral wall part 9 and effectively acts as the power to rotate the wing part 6 by passing through the wing part 6 without escaping to the outside. This was demonstrated by experiments, and the present invention was completed.

[0046] Further, in the present invention, as described above, if the resistance plate is disposed sufficiently deep below the water surface 1, it has been found that this resistance plate hardly swings and remains in a stationary state (quasi-stationary state) even when the water surface 1 moves up and down due to waves. This is used as the mounting portion 10 in a stationary state in water, and the container portion 8 is erected thereon. By configuring to accommodate the wing portion 6 of the impeller portion 3 that swings (moves up and down) due to waves in the water within the container portion 8 in a stationary state in a close state, the manufacturing and installation become even easier.

[0047] Specifically, as described above, in this embodiment, with the resistance plate in a stationary state as the mounting portion 10, a bottomed cylindrical container portion 8 having an upper opening is erected. As a floating portion guide mechanism 13, a guide column is erected on this mounting portion 10, and the floating portion 2 is provided to be vertically movable using this guide column as a guide. A power generation portion 5 (generator) is provided on this floating portion 2, and the impeller portion 3 is vertically provided. A wing portion 6 (impeller) is provided at the lower end of the rotation shaft 4 of this impeller portion 3, and this wing portion 6 is configured to be vertically movable and accommodated in the container portion 8 in a close state to the peripheral wall portion 9.

[0048] That is, as described above, the resistance plate disposed deep in the water is provided as the mounting portion 10, and the container portion 8 is provided on this mounting portion 10 in a stationary state, so that a structure (fixed member in water), the bottom of the water itself, or a configuration where the mounting portion 10 does not need to be provided thereon is adopted.

[0049] Therefore, in this embodiment, by simply throwing and floating it on the water surface 1 (for example, the sea surface), the container portion 8 can be provided in a stationary state, and the floating portion 2 and the impeller portion 3 can be provided to move up and down due to the up and down movement of the waves. Thus, it becomes a wave power generation device that is extremely easy to install. Note that the mounting portion 10 may be provided on a structure (fixed member in water) or the bottom of the water, and the container portion 8 may be fixed to this mounting portion 10 in water. Alternatively, the mounting portion 10 may be provided on a floating body connected thereto, and the container portion 8 may be provided on such a mounting portion 10 that remains in a stationary state even when the floating portion 2 moves up and down due to waves (although it swings when a large force such as a tide is applied).

[0050] Further, in this embodiment, a guide mechanism 14 for the impeller portion is provided to guide the wing portion 6 of the impeller portion 3 to move up and down along the peripheral wall portion 9 in a close state within the container portion 8.

[0051] Specifically, for example, a central guide shaft 15 is provided to position the center between the upper crossbar and the lower resistance plate (mounting part 10) of the floating part guide mechanism 13. An impeller part guide mechanism 14 is provided, configured such that the rotation shaft 4 of the impeller part 3 is rotatably fitted onto this central guide shaft 15. The rotation shaft 4 (and blade part 6) of the impeller part 3 is rotatably fitted onto the central guide shaft 15 of this impeller part guide mechanism 14, and the power generation rotating part 7 of the power generation unit 5 is also rotatably fitted onto it. As a result, the impeller part 3 is centered and its vertical movement is also guided, so that the blade part 6 moves up and down in close proximity to the container part 8 even under wave-induced oscillations, and power generation is always performed efficiently and well based on the above principle.

[0052] Furthermore, the impeller section guide mechanism 14 may be configured by fitting a vertically movable guide cylinder 27 into the housing section 8 so as to be vertically movable, rather than using a central guide shaft 15 for centering (as in Embodiment 3 described later), or a combination of these configurations may be used, and the design can be adapted as appropriate.

[0053] Thus, in this embodiment, the device is configured to be able to be dropped and floated in the ocean, making it not only easy to manufacture but also easy to install. Even if it is miniaturized or configured as a compact type with low output, a large number of these devices can be easily dropped and installed in the ocean, and the total power output from these combined can be easily increased, resulting in an extremely practical and excellent wave power generation device.

[0054] Furthermore, because of its simple and easy-to-install configuration, it can be easily attached to structures in large numbers without the need for a resistance plate. It can also be configured to be attached to multiple underwater attachment points 10 on the structure, and the total power output can be easily increased by combining these.

[0055] Alternatively, the upper end position of the container portion 8 or the volume-changing container portion 20 (described later), which is installed in a stationary or fixed state, may be configured to be expandable or retractable, or to be replaceable, so that the vertical dimension or position can be adjusted, thereby allowing adjustment of the position of the wing portion 6 within the container portion 8 or the position of the wing portion 6 relative to the volume-changing container portion 20 (described later).

[0056] In this case, the mounting portion 10 could be configured to allow adjustment of its position, but in this embodiment, the length and upper end position of the container portion 8 and the volume-changing container portion 20 are made variable, thereby allowing for easy adjustment of the position of the wing portion 6 and its range of vertical movement.

[0057] Furthermore, in the aforementioned Embodiment 1 shown in Figures 1 to 3, the resistance plate placed deep in the water was configured as a stationary (or semi-stationary) mounting portion 10, and the container portion 8 was provided thereon. However, as shown in Figure 4, for example, the mounting plate was provided as a mounting portion 10 that protruded into the water from a structure (fixed member), and the container portion 8 was provided on this fixed mounting portion 10 in the same manner as in Embodiment 1 (a configuration in which the container portion 8 is provided on the fixed member and is in a fixed state) (Embodiment 2). Because of this simple and easy-to-install configuration, it is possible to install many resistance plates on a structure without having to place them deep in the water via the floating portion 2 as in Embodiment 1, and this embodiment also results in a wave power generation device with excellent practicality that can easily increase the total power output when these are combined.

[0058] In the above embodiments 1 and 2, a wing section guide mechanism 14 is provided to guide the wing section 6 of the wing section 3 to move up and down along the cylindrical peripheral wall 9 within the container section 8, keeping it in close proximity to the peripheral wall 9. Specifically, as described above, the wing section guide mechanism 14 is provided with a central guide shaft 15 that positions the center between the upper crossbar and the lower resistance plate (mounting section 10) of the floating section guide mechanism 13, and the rotating shaft 4 of the wing section 3 is rotatably fitted onto this central guide shaft 15, as is the rotating part 7 for power generation of the power generation section 5, so that the wing section 3 is centered and its up and down movement is also guided. However, in embodiment 3 shown in Figures 5 and 6, instead of a central guide shaft 15, a guide cylinder 27 is provided at the lower part of the rotating shaft 4 via a bearing section (connecting section supported by a bearing), and the wing section guide mechanism 14 is configured such that this guide cylinder 27 is fitted into the container section 8 so that it can move up and down.

[0059] Furthermore, as shown in Embodiment 4 in Figures 7 and 8, the configuration may include an impeller movement assisting means 11 that assists in the downward or upward movement of the impeller section 3, which moves up and down in conjunction with the vertical movement of the floating section 2.

[0060] Specifically, in this embodiment, when the floating part 2 moves upward (rises) due to the waves caused by the magnetic force of the magnet 19, the floating part 2 is attracted and held to the upper rib. Even when the floating part 2 tries to move downward (descend) again due to the waves, the floating part 2 will not descend for a while due to this magnetic attraction. When the water surface 1 descends and, for example, the degree to which the floating part 2 is exposed increases, the magnetic attraction detaches due to the weight of the floating part 2, etc., and the floating part 2, etc. falls all at once due to gravity. As a result, the blade 6 of the impeller 3 descends through the water with a force stronger than the downward oscillation caused by the waves, and the blade 6 can be rotated quickly, thereby increasing the amount of power generated.

[0061] Furthermore, in the embodiment 5 shown in Figures 9 and 10, the configuration includes a mass increasing means 12 that increases the mass of the float section 2 or the impeller section 3 when the float section 2 is moving up and down or when it is rising.

[0062] Increasing the mass allows the blade section 6 of the impeller section 3 to descend in the water with greater force and rotate faster, thereby increasing the amount of electricity generated.

[0063] However, simply increasing the mass would make transportation for installation more difficult and reduce practicality. In this embodiment 5, for example, the floating part 2 is equipped with a floating part container 17 that is placed in water by a weight 16, and a check valve 18 is provided to discharge air to the outside. Although it is light before installation in water, when the floating part 2 is floated on the water surface 1, the air in the floating part container 17 is discharged through the check valve 18 and water enters, so the mass of the floating part 2 including the floating part container 17 automatically increases. Although it is light during transportation, the mass of the moving part of the impeller part 3 including the floating part 2 increases when in use, thus increasing the amount of power generated. This embodiment 5 is configured with the aforementioned mass increasing means 12.

[0064] Next, Examples 6, 7, and 8, which are embodiments of the invention described in claim 2, will be described.

[0065] First, in Embodiment 6 shown in Figures 11 and 12, a volume-changing container section 20 is provided in a stationary state, which expands and contracts vertically in conjunction with the vertical movement of the wing section 6 of the impeller section 3 due to the vertical movement of the floating section 2 caused by waves, thereby changing the volume of the container section 20. In other words, the upper end is pushed and pulled and expands and contracts, but the lower part (bottom) is provided on the mounting section 10 in a stationary state, so that a part (bottom) of the volume-changing container section 20 is provided in a stationary state. As shown in these drawings, the other configurations in Embodiment 6, Embodiment 7, and Embodiment 8 are substantially the same as those in Embodiment 1 of the invention described in claim 1, and the configurations of Embodiments 2 to 5 are applicable.

[0066] In this embodiment (this embodiment 6), the volume-changing container 20 is configured such that the peripheral wall portion 9 expands and contracts vertically in conjunction with the vertical movement of the wing portion 6 due to the waves, thereby changing the volume. In other words, it is configured as a bellows-like container that can expand and contract in volume. For example, the bellows-like peripheral wall portion 9 contracts vertically in conjunction with the downward movement (downward movement) of the wing portion 6, causing the volume to decrease. Furthermore, the wing portion 6, which moves up and down, is always positioned on the upper outer part (directly above the upper edge) of the volume-changing container 20, and the volume changes in conjunction with this deformation.

[0067] To explain further, the lower part of the volume-changing container section 20 is attached to the stationary mounting section 10, and its peripheral wall section 9 is bellows-shaped, with the height (vertical dimension) of its upper end being variable, making it expandable and contractible so that the volume changes between large and small. An interlocking connecting section 21 is provided to connect the upper end of the volume-changing container section 20 to the floating section 2, so that the volume-changing container section 20 expands and contracts in conjunction with the vertical movement of the floating section 2 and the vertical movement of the wing section 6 of the impeller section 3, and in this embodiment, the wing section 6 is always positioned directly above the upper end outside the volume-changing container section 20 so that it deforms in conjunction with the movement. Furthermore, when the wing section 6 moves upward, the upper end also moves upward in conjunction, and the length in the vertical direction is extended.

[0068] Therefore, in this embodiment, when the blade 6 moves up and down in water, for example, in conjunction with the downward movement of the blade 6, the volume of the volume-changing container 20 changes in a smaller size due to the linked deformation (volume reduction change). As a result, the blade 6 receives almost all of the water that is outside the volume-changing container 20 and rotates, causing the power generation rotating part 7 of the power generation unit 5 to rotate and generate electricity. In other words, the blade 6 of the impeller unit 3, which moves up and down in water, is always positioned directly above the outside of the volume-changing container 20 as it rotates. Therefore, as the volume-reducing change of the volume-changing container 20 causes the blade 6 to receive almost all of the water below it (in front of the movement of the blade 6), that is, the water that is outside the volume-changing container 20, and rotates. In other words, as a result of the contraction and deformation of the volume-changing container section 20, the water that becomes outside the container passes through the blade section 6 without avoiding it and effectively acts as power to rotate the blade section 6 (because the blade section 6 receives water in front of it with minimal leakage and rotates), thus improving power generation efficiency.

[0069] For example, by configuring the wing portion 6 to have approximately the same diameter as or slightly larger than the upper opening of the volume-changing container portion 20, water outside the volume-changing container portion 20 will pass through the wing portion 6 and be received without leakage, resulting in a dramatic increase in power generation and improved power generation efficiency.

[0070] Furthermore, the volume-changing container section 20, like the invention described in claim 1 above, only needs to be provided with a part (lower part) in a stationary state or a fixed state fixed to be stationary, and the upper end of the floating section 2 is connected to it. This makes it easy to manufacture and install, allows for mass production, and enables the installation of many units to generate a large amount of power. For example, a resistance plate placed deep underwater can be used as a mounting section 10 in a stationary state (semi-stationary state), and the lower part of the volume-changing container section 20 can be attached to it. The floating section 2, equipped with a buoyancy guide mechanism 13, can be mounted on this stationary mounting section 10 so as to be vertically movable. By connecting the floating section 2 to the upper end of the volume-changing container section 20, the lower part of the volume-changing container section 20 can be set to a stationary state simply by being dropped and floating on the water surface 1. The floating section 2 and buoyancy section 3 move up and down with the waves, and the volume-changing container section 20 can be configured to expand and contract in conjunction with this vertical movement. This makes it possible to realize a wave power generation device that is extremely easy to manufacture and install.

[0071] Furthermore, Embodiment 7 shown in Figures 13 to 15 is also an embodiment of the invention described in claim 2. However, in this embodiment, the volume-changing container section 20 is not a bellows-like container that expands and contracts to change its volume as in Embodiment 6, but rather a polymerized container type volume-changing container section 20 (a volume-changing container section 20 that also incorporates a wing section guide mechanism 14). This polymerized container section 20 is composed of multiple cylindrical containers having an upper opening that are superimposed, and the volume changes as they expand and contract in the vertical direction by sequential superposition.

[0072] Otherwise, this embodiment 7 is the same as embodiment 6, but in this embodiment as well, an interlocking connecting part 21 is provided that connects the floating part 2 and the upper end of the volume-changing container part 20 which is expandable and contractible vertically, so that the volume-changing container part 20 (the uppermost polymerized container part 20A) moves up and down in conjunction with the floating part 2 and the wing part 6, and the polymerized container parts 20A, B, and C that make up the volume-changing container part 20 are configured to sequentially overlap as the floating part 2 moves downward, reducing the length (height) in the vertical direction, and conversely, to sequentially separate as it moves upward, extending the length in the vertical direction, so that the volume-changing container part 20 can expand and contract in conjunction with the floating part 2, thereby changing its volume.

[0073] Specifically, as described above, the floating portion 2 and the upper flange portion of the uppermost polymerization container portion 20A are connected by the interlocking connecting portion 21, and the lowermost polymerization container portion 20C is provided on the stationary mounting portion 10 and is set in a stationary state. The polymerization container portions 20A, B, and C are configured to deform to shrink and change in volume as they sequentially polymerize (so that their respective upper flange portions polymerize sequentially), and to deform to expand and change in volume as they sequentially separate.

[0074] Furthermore, in this embodiment, in order to ensure that the volume reduction and volume increase changes, which are linked to the vertical movement of the floating portion 2 of the volume-changing container portion 20, occur at all times, the floating portion 2 and the flange portion of the uppermost polymerization container portion 20A are connected by the interlocking connecting portion 21. An interlocking lifting portion 23 is provided on this flange portion and is provided to pass through the flange portion of the next intermediate polymerization container portion 20B. A retaining portion 24 is provided at the lower end of this interlocking lifting portion 23. In addition, an interlocking lifting portion 23 with a retaining portion 24 at its lower end is also provided on the flange portion of this intermediate polymerization container portion 20B and is provided to pass through the flange portion of the next polymerization container portion 20C.

[0075] In other words, in this embodiment, three polymerization container sections 20A, B, and C are provided as described above. The lowest polymerization container section 20C is provided on the lower, stationary mounting section 10 (the lower part is stationary), the uppermost polymerization container section 20A is connected to the floating section 2 by the interlocking connecting section 21 and moves up and down in conjunction with the floating section 2 and the wing section 6, and the intermediate polymerization container section 20B is pushed down and pulled up by the uppermost polymerization container section 20A.

[0076] Specifically, for example, when the floating section 2 moves downward, the wing section 6 moves downward, and the uppermost polymerization container section 20A, which is connected to the floating section 2 by the interlocking coupling section 21, moves downward. As this uppermost polymerization container section 20A moves downward, it polymerizes onto the next intermediate polymerization container section 20B, and when its flange pushes against the flange of the next intermediate polymerization container section 20B, the two polymerization container sections 20A and B move further downward in their polymerized state and polymerize onto the lowest, stationary polymerization container section 20C.

[0077] Conversely, when the floating portion 2 moves upward, the uppermost polymerization container portion 20A moves upward and separates from the uppermost polymerization container portion 20A in conjunction with the interlocking connecting portion 21, and the retaining portion 24 at the lower end of the interlocking lifting portion 23 provided on its flange portion lifts the intermediate polymerization container portion 20B, causing it to separate from the lowermost polymerization container portion 20C. In this embodiment, the polymerization container portion 20C below the intermediate polymerization container portion 20B is the lowermost polymerization container portion 20C, but since it is fixed to the stationary mounting portion 10 and remains stationary, the retaining portion 24 at the lower end of the interlocking lifting portion 23 provided on the intermediate polymerization container portion 20B acts simply as a retaining portion 24 to prevent the intermediate polymerization container portion 20B from separating from the lowermost polymerization container portion 20C above a predetermined height.

[0078] In this embodiment, as described above, the blade portion 6 of the impeller portion 3 moves up and down in conjunction with the vertical movement of the float portion 2. In conjunction with this, the volume-changing container portion 20 expands and contracts by varying the degree of polymerization of each polymerization container portion 20A, B, and C. Furthermore, in this embodiment as well as in embodiment 6, the blade portion 6 is always positioned directly above the upper end of the volume-changing container portion 20 (the uppermost polymerization container portion 20C) with a diameter approximately the same as the outer diameter of the volume-changing container portion 20.

[0079] Therefore, similar to the above-described embodiment 6, since the outer diameter of the blade portion 6 is equal to or slightly larger than the outer diameter of the volume-changing container portion 20, water outside the volume-changing container portion 20 passes through the blade portion 6 without leakage and the blade portion 6 receives it all without leakage, resulting in a dramatic increase in power generation and improved power generation efficiency.

[0080] Furthermore, in both this embodiment (Embodiment 7) and Embodiment 6, the volume-changing container section 20 is configured to expand and contract vertically, changing its volume, and its upper end moves up and down together with the floating section 2 and the wing section 6. Therefore, compared to Embodiment 1, in which the entire structure is stationary and the upper end does not move vertically or deform, and the wing section 6 moves up and down within the stationary container section 8, this wave power generation device makes it easier to design a larger range of motion for the wing section 6.

[0081] Furthermore, Embodiment 8 shown in Figures 16 and 17 is also an embodiment of the invention described in claim 2. In this embodiment, the volume-changing container 20 is not a container whose volume changes by deforming in conjunction with the vertical movement of the floating portion 2 and the wing portion 6, but rather, although it could be said that it deforms, the bottom is set in a stationary state (a stationary bottom portion 25 is provided), and the peripheral wall portion 9 surrounding this stationary bottom portion 25 is configured to move up and down in conjunction with the wing portion 6, so that the volume formed by this stationary bottom portion 25 and the peripheral wall portion 9 surrounding it changes in size.

[0082] Otherwise, this embodiment 8 is the same as embodiments 6 and 7, but in this embodiment, an interlocking connecting part 21 is provided that connects the floating part 2 and the peripheral wall part 9. The interlocking connecting part 21 that hangs down from the floating part 2 penetrates the upper end flange part of the peripheral wall part 9 of the volume-changing container part 20 and is connected to the lower end flange part. The peripheral wall part 9 of the volume-changing container part 20 is configured to move up and down together with the floating part 2 and the wing part 6 relative to the stationary bottom part 25, and is configured to move up and down so that the wing part 6 is always positioned in the upper inner part of the peripheral wall part 9.

[0083] Specifically, for example, a circular stationary bottom portion 25 is provided on the aforementioned stationary mounting portion 10 via a bottom support portion 22, and a circular tubular container portion (the peripheral wall portion 9) is fitted snugly around this stationary bottom portion 25, which is stationary together with the mounting portion 10, so as to be vertically movable. The volume-changing container portion 20 is formed by the peripheral wall portion 9, which is a tubular container portion with openings at the top and bottom, and the stationary bottom portion 25.

[0084] Furthermore, the peripheral wall portion 9, which is the tubular portion of the volume-changing container portion 20, is configured to move up and down in conjunction with the up and down movement of the floating portion 2 by an interlocking connecting portion 21 that hangs down from the floating portion 2, and is configured to move up and down relative to the stationary bottom portion 25 in a state where it is prevented from coming off by a peripheral wall retaining portion 26 provided at the lower end of the interlocking connecting portion 21, thereby configuring the peripheral wall portion 9 surrounding the stationary bottom portion 25 in this stationary state to change the volume of the volume-changing container portion 20 in conjunction with the up and down movement of the wing portion 6.

[0085] In other words, in this embodiment, for example, when the floating portion 2 moves downward, the wing portion 6 moves downward and the peripheral wall portion 9 moves downward relative to the stationary bottom portion 25 (guided downward by the vertical movement of the floating portion 2 by the floating portion guide mechanism 13 and the stationary bottom portion 25), and conversely, when the floating portion 2 or the wing portion 6 moves upward, the peripheral wall portion 9 also moves upward. Therefore, the volume of the volume-changing container portion 20 changes in conjunction with the vertical movement of the wing portion 6, and in this embodiment, the wing portion 6 is always positioned directly below the upper end of the volume-changing container portion 20, which has an inner diameter slightly larger than its outer diameter.

[0086] Therefore, similar to the above-mentioned embodiments 6 and 7, the outer diameter of the blade portion 6 is made to be almost the same as (slightly smaller in diameter than) the inner diameter of the volume-changing container portion 20, and the gap between them is made to be as small as possible, similar to embodiment 1. As a result, the water in the volume-changing container portion 20 passes through the blade portion 6 with little leakage and the blade portion 6 receives almost all of it without leakage, which dramatically increases the amount of power generated and improves the power generation efficiency.

[0087] Furthermore, the present invention is not limited to this embodiment, and the specific configuration of each constituent element can be designed as appropriate.

[0088] 1. Water surface 2. Floating section 3. Impeller section 4. Rotating shaft 5. Power generation section 6. Blade section 7. Rotating section for power generation 8. Body section 9. Peripheral wall section 10. Mounting section 11. Impeller section movement assisting means 12. Mass increasing means 13. Floating section guide mechanism 14. Impeller section guide mechanism 15. Central guide shaft 16. Weight 17. Floating section body section 18. Check valve 19. Magnet 20. Volume changing body section 21. Interlocking coupling section 22. Bottom support section 23. Interlocking lifting section 24. Retaining section 25. Stationary bottom section 26. Peripheral wall retaining section 27. Guide cylinder

Claims

1. A wave power generation device comprising: a floating section that moves up and down with the up and down movement of the water surface caused by waves; an impeller section that rotates by moving up and down in the water due to the up and down movement of the floating section; and a power generation section that generates electricity by the rotation of the rotation axis of the impeller section, wherein when the floating section moves up and down with waves, the blades of the impeller section rotate in the water while moving up and down, causing the rotation axis of the impeller section to rotate, which in turn causes the power generation rotating section of the power generation section to rotate, thereby generating electricity, wherein a container section is provided to house the blades of the impeller section that move up and down with the up and down movement of the floating section with waves, and this container section is provided in a stationary state or a fixed state that surrounds the blades that move up and down in the water, and the inner diameter of the peripheral wall section is slightly larger than the outer diameter of the blades of the impeller section, so that the blades move up and down in close proximity to the peripheral wall section in the water inside the container section, A wave power generation device characterized in that, when the blade portion of the impeller portion moves up and down within the container portion in water, the blade portion moves up and down in close proximity to the peripheral wall portion within the container portion, thereby receiving water within the container portion and rotating, causing the rotating part for power generation of the power generation portion to rotate and generate electricity.

2. A wave power generation device comprising a floating section that moves up and down with the up and down movement of the water surface caused by waves, a vane section that rotates by moving up and down in the water due to the up and down movement of the floating section, and a power generation section that generates electricity by the rotation of the rotation shaft of the vane section, wherein when the floating section moves up and down with waves, the blades of the vane section rotate in the water while moving up and down, causing the rotation shaft of the vane section to rotate, which in turn causes the power generation rotating section of the power generation section to rotate, thereby generating electricity, and a volume-changing container section is provided whose volume changes in conjunction with the up and down movement of the blades of the vane section caused by waves, wherein the volume-changing container section is configured such that even when the volume changes in conjunction with the up and down movement of the blades of the vane section, the blades are located in the outer upper or inner upper part of the volume-changing container section. A wave power generation device characterized in that, in water, the volume of the volume-changing container changes in conjunction with the vertical movement of the blades of the impeller unit, and as a result of this volume reduction, the blades receive the water that is outside or inside the container and rotate, causing the power generation rotating part of the power generation unit to rotate and generate electricity.

3. The wave power generation device according to claim 1 or 2, wherein the container portion or a part of the volume-changing container portion is provided on an underwater mounting portion or underwater bottom or an underwater mounting portion provided on the underwater bottom or an underwater fixing member or an underwater mounting portion provided on a fixing member, and is configured to be provided in a stationary state in the water or in a fixed state fixed to be stationary, and the floating portion is provided on the mounting portion or the underwater bottom or the underwater fixing member so as to be able to move up and down via a floating portion guide mechanism, and the impeller portion is suspended from the floating portion, and the wing portion of the impeller portion moves up and down together with the floating portion due to the waves.

4. The wave power generation device according to claim 1, characterized in that the container is a bottomed cylindrical container with an open top, and the blade portion of the impeller portion is housed in close proximity to the cylindrical peripheral wall portion and is able to move up and down along the peripheral wall portion.

5. The wave power generation device according to claim 2, characterized in that the volume-changing container is configured as a bottomed cylindrical container with an open top and a volume that can change, and when the volume of the volume-changing container is reduced in volume in conjunction with the downward movement of the blade portion of the impeller portion, the blade portion is located outside or inside the volume-changing container, and the blade portion receives the water that becomes outside or inside the container due to this volume reduction and rotates.

6. The wave power generation device according to claim 1 or claim 2, characterized in that the container portion or the volume-changing container portion, which is provided in whole or in part in a stationary state or in a fixed state fixed to be stationary, is configured to be expandable or replaceable, and the position of the wing portion within the container portion or the position of the wing portion relative to the volume-changing container portion is configured to be adjustable.

7. The wave power generation device according to claim 1 or 2, characterized in that it is provided with a means for assisting the downward or upward movement of the impeller section.

8. The wave power generation device according to claim 1 or 2, characterized in that it is provided with a mass increasing means for increasing the mass of the floating portion or the impeller portion when the floating portion moves up and down due to waves.

9. The wave power generation device according to claim 1, characterized in that the gap between the peripheral wall portion of the container portion and the tip portion of the blade portion of the impeller portion is set to be 1 / 10 or less of the outer diameter of the blade portion.

10. The wave power generation device according to claim 2, characterized in that even if the volume of the volume-changing container changes in conjunction with the vertical movement of the blade portion of the impeller portion, the blade portion is located in the outer upper part adjacent to the upper edge of the volume-changing container or in the inner upper part adjacent to the upper edge of the volume-changing container.

11. The wave power generation device according to claim 10, characterized in that when the volume-changing container is reduced in volume, the outer diameter of the wing portion located on the outer upper or inner upper part of the volume-changing container is set to be slightly larger in diameter, equal in diameter, or slightly smaller in diameter than the outer diameter of the volume-changing container.

12. The wave power generation device according to claim 1 or 2, characterized in that it is provided with an impeller vertical movement guide mechanism that guides the blade portion of the impeller portion to move up and down.

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