JP2011106434A - Ocean energy power generation device and storage device using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ocean energy power generation device and a storage device using the same, obtaining electric energy from various ocean energy such as a tidal current and a tide. <P>SOLUTION: The ocean energy power generation device 1 includes: an inner elastic plate 11 formed of flexible elastic raw material; a pair of piezoelectric films 12a, 12b for holding the inner elastic plate 11 between them; and a pair of outer elastic plates 13a, 13b formed of flexible elastic raw material to hold the pair of piezoelectric films between them. The pair of piezoelectric films 12a, 12b are respectively separated from a neutral axis of the ocean energy power generation device 1, and when the ocean energy power generation device 1 bends, the pair of piezoelectric films 12a, 12b are respectively separated from the neutral axis of the ocean energy power generation device 1 and bent to generate power. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a marine energy power generation device and a power storage device using the same.

  In recent years, increase in energy demand and global warming have become a problem, and accompanying this, further research on power generation using natural energy sources such as solar power generation and wind power generation has been continued. In addition, the ocean current can be expected as a stable natural energy source that is inexhaustible in time and space, and effective utilization of such ocean energy is desired.

  Various types of tidal power generation, wave power generation, and tidal power generation have been proposed and studied for effective use of ocean energy. However, power generation using these marine energies has many problems in terms of power generation efficiency, economy, safety, landscape, cost, etc. compared to solar power generation and wind power generation, and it is difficult to put it into full-scale practical use. is there.

  Various researches and developments have been made on elements and devices that can convert such natural energy into electric energy. For example, Patent Document 1 discloses a wind power generation module using a piezoelectric element. In Patent Document 1, one end of a wind receiving plate is fixed to a base, and a blow-off member made of a flexible ribbon-shaped cloth material or film material is attached to the other end (free end). And the piezoelectric element is fixed to both sides of the wind receiving plate, and the wind blower member receives the wind from various directions and flutters freely, and it is transmitted to the wind receiving plate, thereby promoting the power generation from the piezoelectric element. I am letting.

JP 2009-24583 A

  In the wind power generation module of Patent Document 1, a plate made of a hard elastic material such as a plastic plate or a metal thin plate is used as the wind receiving plate. Since the wind receiving plate is a hard elastic material, it becomes difficult to bend when the wind receiving plate is thick, and when a flexible piezoelectric film is used as the piezoelectric element, the piezoelectric film is hardly distorted. Even if this wind power generation module is arranged as it is in the ocean, there is a problem that the piezoelectric film is not sufficiently bent due to fluctuations caused by waves or the like, and the power generation efficiency cannot be increased.

  The present invention has been made in view of the above matters, and an object thereof is a marine energy power generation device capable of obtaining electrical energy from various marine energies such as tidal currents and tides, and a power storage device using the same Is to provide.

The ocean energy power generation device according to the present invention,
A marine energy power generation device that is installed in the ocean and converts ocean energy into electrical energy,
An inner elastic plate made of a flexible elastic material;
A pair of piezoelectric films sandwiching the inner elastic plate;
A pair of outer elastic plates made of a flexible elastic material and sandwiching the pair of piezoelectric films, and
Each of the pair of piezoelectric films is separated from a neutral axis of the ocean energy power generation device, and each of the pair of piezoelectric films is separated from the neutral axis of the ocean energy power generation device when the ocean energy generation device is bent. And generating electricity by bending.

  Further, it is desirable that the pair of outer elastic plates have the same thickness.

  The flexible elastic material is preferably silicon rubber, natural rubber or synthetic rubber.

  The relationship between the distance (δ) between the pair of piezoelectric films and the thickness (H) of the ocean energy power generation device is preferably 0.8 <δ / H <1.

  Furthermore, a pair of or more piezoelectric films and a pair of or more outer elastic plates may be alternately laminated so as to sandwich the pair of outer elastic plates.

The power storage device according to the present invention includes:
Any one of the above ocean energy power generation devices;
A rectifier connected to the ocean energy power generation device;
And a power storage unit connected to the rectifier.

  In the ocean energy power generation device according to the present invention, each piezoelectric film contained when bent is bent in a state of being separated from the neutral axis. Since the piezoelectric film bends in a state of being separated from the neutral axis of the ocean energy power generation device, any piezoelectric film expands or contracts entirely when the bending occurs, so that the voltage generated in the same piezoelectric film is not canceled out. A large voltage can be generated.

It is a disassembled perspective view which shows schematic structure of an ocean energy power generation device. It is sectional drawing of an ocean energy power generation device. It is sectional drawing which shows a state when an ocean energy power generation device bends. It is sectional drawing which shows a state when an ocean energy power generation device bends. It is sectional drawing which shows the wiring of an ocean energy power generation device. It is a circuit diagram which shows the wiring of an ocean energy power generation device. It is sectional drawing which shows the wiring of an ocean energy power generation device. It is a circuit diagram which shows the wiring of an ocean energy power generation device. It is sectional drawing of the ocean energy power generation device which concerns on another form. It is a circuit diagram which shows schematic structure of an electrical storage apparatus. 3 is a measurement result of an output voltage in Example 1. 3 is a measurement result of an output voltage in Example 1. It is an electric power measurement result in Example 2. FIG. (A) is a figure which shows a mode that the ocean energy power generation device of Case1 in Example 3 deform | transforms, (B) is a figure which shows a mode that the marine energy power generation device of Case2 in Example 3 deform | transforms. It is a figure which shows a mode that the ocean energy power generation device of Case3 in Example 3 deform | transforms. It is a figure which shows a mode that the ocean energy power generation device of Case4 in Example 3 deform | transforms. It is a figure which shows the time-dependent change of the output voltage of Case1 in Example 3. It is a figure which shows the time-dependent change of the output voltage of Case2 in Example 3. It is a figure which shows the mode of the ocean energy power generation device which deform | transforms with the turbulent flow and eddy energy of a cylinder wake in Example 4. FIG. It is a figure which shows the time-dependent change of the electromotive force output in Example 4. FIG. It is a figure which shows the time-dependent change of the output voltage in Example 5. FIG. It is a figure which shows the time-dependent change of the electrical storage voltage in Example 5. FIG.

(Ocean energy power generation device)
The ocean energy power generation device will be described with reference to the drawings. As shown in the exploded perspective view of FIG. 1 and the cross-sectional view of FIG. 2, the ocean energy power generation device includes an inner elastic plate 11, a pair of piezoelectric films 12a and 12b sandwiching the inner elastic plate 11, and a pair of piezoelectric films. It is comprised from a pair of outer side elastic board 13a, 13b holding 12a, 12b.

  The inner elastic plate 11 and the outer elastic plates 13a and 13b are made of a flexible elastic material that is flexible and has elasticity so that it can be easily deformed flexibly by ocean energy such as tidal currents. Examples of the flexible elastic material include silicon rubber, natural rubber, and synthetic rubber.

  The outer elastic plates 13a and 13b have substantially the same thickness. For this reason, when the ocean energy power generation device 1 is bent, the neutral axis is present on the inner elastic plate 11 disposed in the center.

  The piezoelectric films 12a and 12b are polarized in accordance with the distortion to generate electric charge and generate electricity. The piezoelectric films 12a and 12b have electrode films formed on both surfaces by vapor deposition, sputtering, or conductive paste. Wirings 21a, 21b, 22a, and 22b are connected to the electrode films on both surfaces of the piezoelectric films 12a and 12b, respectively, and electric charges that are generated from the wirings 21a, 21b, 22a, and 22b according to the distortion of the piezoelectric films 12a and 12b. Is taken out.

  Since the ocean energy power generation device 1 generates power by bending the piezoelectric films 12a and 12b by fluctuations of waves or the like, the polymer piezoelectric films 12a and 12b made of a flexible polymer material are used as the piezoelectric films 12a and 12b. It is done. For example, a polymer piezoelectric film using polyvinylidene fluoride or vinylidene cyanide as a material can be used.

  The piezoelectric films 12a and 12b are preferably ultra-thin with a thickness of 40 to 110 [mu] m so that the piezoelectric films 12a and 12b can be bent flexibly even by fluctuations such as waves. The ultra-thin piezoelectric films 12a and 12b can be easily processed into a desired shape and a good bondability with the inner elastic plate 11 and the outer elastic plates 13a and 13b in addition to lightweight and flexible mechanical motion characteristics. It has the advantage of.

  The piezoelectric films 12a and 12b, the inner elastic plate 11, and the outer elastic plates 13a and 13b are preferably in close contact with each other. Since the piezoelectric films 12a and 12b are in close contact with the inner elastic plate 11 and the outer elastic plates 13a and 13b, the piezoelectric films 12a and 12b are expanded or compressed by the bending of the inner elastic plate 11 and the outer elastic plates 13a and 13b. Is promoted. Thereby, the electric power generation efficiency of piezoelectric film 12a, 12b is improved. The adhesion between the piezoelectric films 12a and 12b and the inner elastic plate 11 and the outer elastic plates 13a and 13b may be based on adhesion of a silicon-based resin or the like.

  Moreover, the ocean energy power generation device 1 is installed and used in the sea, and the waterproof effect is enhanced by the close contact between the piezoelectric films 12a and 12b and the inner elastic plate 11 and the outer elastic plates 13a and 13b. In addition to preventing rusting of the electrode films and wirings of the piezoelectric films 12a and 12b, it also contributes to improving durability.

  Next, the state where the ocean energy power generation device 1 is bent will be described. FIG. 3 shows a cross section in a state where the ocean energy power generation device 1 is bent. In the figure, the dashed line indicates the neutral axis of the ocean energy power generation device 1. Since the pair of outer elastic plates 13a and 13b have substantially the same thickness, the neutral axis exists in the inner elastic plate 11 when the ocean energy power generation device 1 is bent. And since a pair of piezoelectric film 12a, 12b is the structure which pinched | interposed the inner elastic board 11, all of a pair of piezoelectric film 12a, 12b are bent in the state spaced apart from the neutral axis of the ocean energy power generation device 1. .

  As shown in FIG. 3, when the ocean energy power generation device 1 protrudes upward and bends, both sides of the piezoelectric film 12 a positioned above are pulled, so that the piezoelectric film 12 a extends entirely. On the other hand, since both surfaces of the piezoelectric film 12b positioned below are both compressed, the piezoelectric film 12b contracts entirely.

  On the other hand, when a piezoelectric film is present on the neutral axis, the power generation efficiency of the piezoelectric film is reduced. This will be described with reference to FIG. FIG. 4 shows a cross section in a state where the ocean energy power generation device 2 having a structure in which one piezoelectric film 12 is sandwiched between a pair of outer elastic plates 13a and 13b is bent. The dashed line in the figure is the neutral axis.

  As shown in FIG. 4, when the piezoelectric film 12 is present on the neutral axis, one surface (upper surface in the drawing) of the piezoelectric film 12 expands and the other surface (lower surface in the drawing) contracts. . In this case, the voltage generated in the piezoelectric film 12 is canceled out, resulting in a decrease in power generation efficiency.

  Thus, when power is generated by bending a piezoelectric film, it is important that both sides of the piezoelectric film are stretched or compressed. In the ocean energy power generation device 1 according to the present embodiment, as shown in FIG. 3, each of the pair of piezoelectric films 12 a and 12 b bends in a state of being separated from the neutral axis. Therefore, each of the piezoelectric films 12 a and 12 b is bent. However, stretch distortion or contraction distortion occurs entirely. For this reason, it is possible to efficiently generate power from the respective piezoelectric films 12a and 12b without canceling out the voltages generated in the piezoelectric films 12a and 12b.

  The pair of piezoelectric films 12a and 12b are preferably separated as much as possible. As the distance between the piezoelectric films 12a and 12b increases, when the ocean energy power generation device 1 is bent, the piezoelectric films 12a and 12b are further away from the neutral axis and expand or contract. When 12b is separated from the neutral shaft, the amount of deformation increases. This is because the piezoelectric films 12a and 12b generate charges according to the amount of deformation, and can generate a larger voltage by being greatly deformed away from the neutral axis.

  For example, as shown in FIG. 2, when the distance between the piezoelectric films 12a and 12b is δ and the thickness of the ocean energy power generation device 1 is H, it is preferable that 0.8 <δ / H <1. This is because if δ / H is smaller than 0.8, the amount of deformation due to the bending of the piezoelectric films 12a and 12b is small, and the generated charge is reduced.

  Furthermore, although the ocean energy power generation device 1 includes two piezoelectric films 12a and 12b, the wirings 21a, 21b, 22a, and 22b connected to these may be connected as follows.

  Consider a case where the ocean energy power generation device 1 is bent downwardly as shown in FIG. Here, when the piezoelectric films 12a and 12b are stretched, the lower surface of the film has a + polarity and the upper surface is a negative electrode, and when contracted, the piezoelectric films 12a and 12b have a polarization characteristic that the upper surface is a positive electrode and the lower surface is a negative electrode. Suppose you have it. When the ocean energy power generation device 1 is bent in a downward convex shape, the piezoelectric film 12a positioned above is contracted, so that polarization occurs and the upper surface potential becomes higher (the upper surface is a + pole and the lower surface is a −pole). On the other hand, since the piezoelectric film 12b positioned below is stretched, polarization occurs and the potential of the lower surface increases (the lower surface is a + pole and the upper surface is a −pole).

  A wiring 21a connected to the electrode film on the upper surface of the piezoelectric film 12a and a wiring 22a connected to the electrode film on the lower surface of the piezoelectric film 12b are connected to form a wiring 23a. On the other hand, the wiring 21b connected to the electrode film on the lower surface of the piezoelectric film 12a and the wiring 22b connected to the electrode film on the upper surface of the piezoelectric film 12b are connected to form a wiring 23b. As described above, when the ocean energy power generation device 1 is bent, it is preferable to connect the wirings that connect the electrode films whose potentials of the piezoelectric films 12a and 12b are high (electrode films that become the positive electrodes).

  FIG. 6 shows a circuit diagram when wiring is performed as described above. By wiring as described above, the directions of the currents output from the piezoelectric films 12a and 12b can be made to coincide with each other as shown by the arrows in FIG. 6, so that a high output voltage can be obtained.

  On the other hand, as shown in FIG. 7, when the wiring 21a and the wiring 22b are connected contrary to the above and the wiring 21b and the wiring 22a are connected, as shown in the circuit diagram of FIG. Since the directions of the currents output from 12b are opposite to each other, the currents are canceled out and the output voltage is lowered, which is not preferable. As described above, it is important for grasping the characteristics of the piezoelectric film and wiring to generate power.

  FIG. 9 shows a cross-sectional structure of the ocean energy power generation device 3 according to another embodiment. The ocean energy power generation device 3 includes a pair of piezoelectric films 14a and 14b and a pair of outer elastic plates 15a and 15b in addition to the ocean energy power generation device 1 described above.

  A pair of piezoelectric films 14a and 14b are stacked while sandwiching a pair of outer elastic plates 13a and 13b. A pair of outer elastic plates 15a and 15b are stacked while sandwiching the pair of piezoelectric films 14a and 14b.

  By setting the pair of outer elastic plates 15a and 15b to the same material and the same thickness, the ocean energy power generation device 3 bends with the central axis of the inner elastic plate 11 as a neutral axis. For this reason, the four piezoelectric films 12a, 12b, 14a, and 14b bend while being separated from the neutral shaft. As a result, the four piezoelectric films 12a, 12b, 14a, and 14b are each subjected to an expansion strain or a contraction strain entirely while being bent. Accordingly, the generated voltage is not canceled out in the same piezoelectric film, so that power can be efficiently generated from each of the piezoelectric films 12a, 12b, 14a, and 14b.

  Further, a structure in which a pair of or more piezoelectric films and a pair of or more outer elastic plates are alternately laminated may be used.

(Power storage device)
A power storage device will be described with reference to FIG. The power storage device 5 includes a marine energy power generation device 4, a rectifier 31 connected to the marine energy power generation device 3, and a power storage unit 32 connected to the rectifier 31.

  As the ocean energy power generation device 4, the above-described ocean energy power generation devices 1 and 3 are used.

  The rectifier 31 rectifies the current (alternating current) output from the ocean energy power generation device 4 and sends it to the power storage unit 32. The rectifier 31 is a so-called full-wave rectifier, and four diodes are used as rectifier elements, and a rectifier circuit is formed by four diodes in a bridge shape, so that the AC generated from the ocean energy power generation device 3 can be stored without waste. 32.

  The power storage unit 32 accumulates the electric charge flowing through the rectifier 31. As the power storage unit 32, various storage batteries, capacitors, and the like are used.

  With the above configuration, the ocean energy power generation device 4 is bent by wave energy or the like, and the electric charge generated by the bending distortion of the piezoelectric film inside is efficiently stored in the power storage unit 32 via the rectifier 31.

  When the piezoelectric film exists on the neutral axis of the ocean energy power generation device and when the piezoelectric film exists apart from the neutral axis of the ocean energy power generation device, the respective ocean energy power generation devices are vibrated. The voltage output from the ocean energy power generation device was verified.

  A marine energy power generation device was made using a polyvinylidene fluoride (PVDF) piezoelectric film (thickness 110 μm) (made by Kureha Chemical Co., Ltd.) as a piezoelectric film, a silicon sheet as an inner elastic plate and an outer elastic plate. The created ocean energy power generation device has a distance between piezoelectric films (inner elastic plate thickness) δ = 1 mm, each outer elastic plate thickness 0.5 mm, and a marine energy power generation device thickness H = about 2 mm. Hereinafter, in this embodiment, this is referred to as a marine energy power generation device A.

  Also, as a reference example, a silicon sheet is used as the outer elastic plate, and a polyvinylidene fluoride (PVDF) piezoelectric film (manufactured by Kureha Chemical Co., Ltd.) having a thickness of 110 μm is used as the piezoelectric film, and one piezoelectric film is formed with a pair of outer elastic plates. An ocean energy power generation device with a sandwiched structure was created. The created ocean energy power generation device has a thickness of 0.5 mm for each outer elastic plate and a thickness H of the ocean energy power generation device of about 1 mm. Hereinafter, in this embodiment, this is referred to as a marine energy power generation device B.

  In addition, both the ocean energy power generation devices A and B have a length × width of 15.0 cm × 2.0 cm.

  One end of each ocean energy power generation device A, B was connected to a vibration exciter, periodically vibrated to repeatedly cause bending deformation of the ocean energy power generation devices A, B, and the generated voltage was measured.

  FIG. 11 shows the result. FIG. 12 shows the change over time in the voltage generated from the ocean energy power generation device B by expanding the range of the vertical axis in FIG. When the piezoelectric film exists on the neutral axis of the ocean energy power generation device, the maximum is about 0.04V. Since the piezoelectric film exists on the neutral axis, one surface of the piezoelectric film expands and the other surface contracts, so that the voltage is canceled in the piezoelectric film, and it is understood that a high voltage cannot be output. .

  On the other hand, in the ocean energy power generation device A, as shown in FIG. 11, the two piezoelectric films each output a voltage of 10 V or more at the maximum. Since each of the two piezoelectric films is separated from the neutral axis, each piezoelectric film expands or contracts entirely, so that no voltage is canceled in the piezoelectric film, and any piezoelectric film is Therefore, a high voltage can be generated.

  Create ocean energy power generation devices with different distances between a pair of piezoelectric films, install each ocean energy power generation device in a two-dimensional wave tank, and verify the amount of electric power due to the difference in the distance between a pair of piezoelectric films Went.

  A marine energy power generation device was made using a polyvinylidene fluoride (PVDF) piezoelectric film (thickness 110 μm) (made by Kureha Chemical Co., Ltd.) as a piezoelectric film, a silicon sheet as an inner elastic plate and an outer elastic plate.

  Piezoelectric film distance (inner elastic plate thickness) δ = 5 mm, outer elastic plate thickness 0.5 mm, ocean energy power generation device thickness H = about 6 mm, and δ / H≈0.83 Hereinafter, the device is referred to as an ocean energy power generation device C. Further, a marine energy power generation device created with a distance between piezoelectric films δ = 1 mm, a thickness of each outer elastic plate 0.5 mm, a thickness H of the marine energy power generation device H = about 2 mm, and δ / H≈0.5, It is described as ocean energy power generation device D. The two types of created ocean energy power generation devices C and D each have a length × width of 28.5 cm × 4.0 cm.

  Moreover, the specification of the used two-dimensional wave-making water tank is length x width x height = 8.0 m x 0.2 m x 0.6 m.

  The marine energy power generation devices C and D were vertically arranged at approximately the center of the two-dimensional wave water tank so that the wave traveling direction and the PVDF bonding surface were orthogonal to each other, and the lower end was fixed by a fixing device. The ocean energy power generation devices C and D can be freely deformed by an external force except for the fixed portion.

  A regular wave having a period of 1 s and a wave height of 5 to 90 mm was generated by a wave making device, and output voltages from the ocean energy power generation devices C and D were measured through an A / D converter, respectively.

  FIG. 13 shows the relationship between the incident wave mm and the power conversion value mW. This electric power is converted in consideration of the internal resistance of the A / D converter.

  As can be seen from FIG. 13, in any of the ocean energy power generation devices C and D, the larger the wave height, the larger the power generation amount. The ocean energy power generation device C having a distance δ between piezoelectric films of 5 mm (δ / H = 0.83) is compared with the ocean energy power generation device D having a distance δ between piezoelectric films of 1 mm (δ / H = 0.5). The amount of power generation is greatly increased. In the ocean energy power generation device C, since the pair of piezoelectric films are largely separated from the neutral axis, the amount of deformation of the piezoelectric film increases and the amount of power generation increases. Thus, it was demonstrated that the amount of electric power can be significantly improved by increasing the distance δ between the piezoelectric films.

  We verified the power generation of ocean energy power generation device by wave and breaking wave energy.

  A marine energy power generation device was made using a polyvinylidene fluoride (PVDF) piezoelectric film (thickness 110 μm) (made by Kureha Chemical Co., Ltd.) as a piezoelectric film, a silicon sheet as an inner elastic plate and an outer elastic plate. The created ocean energy power generation device has a distance between piezoelectric films (inner elastic plate thickness) δ = 5 mm, each outer elastic plate thickness 0.5 mm, device thickness H = 6 mm, length 28.5 cm, and width 4 cm. . Hereinafter, this ocean energy power generation device is referred to as ocean energy power generation device E.

  A submerged dike (top height 30cm, top width 39cm, top water depth 6.5cm) is installed in the aquarium, and the ocean energy power generation device E is connected to the submerged dike from the wave upper side (Case 1) and wave lower side (Case 2), respectively. The lower end was fixed and placed upright at a location 5 cm away.

  A wave was generated under the conditions of a uniform water depth of 36.5 cm, an incident wave height of 8 cm, and a wave period of 1 s, and a wave breaking phenomenon was forcibly generated by the submerged dike.

  The same ocean energy power generation device E was also cantilevered horizontally (support point: submerged depth 6.5 cm, 5 cm from the wave upper edge) (Case 3). .

  Moreover, also when not installing a submerged dike (Case4), the lower end of the ocean energy power generation device E was fixed to the water tank and installed upright.

  FIG. 14 (A) shows the case of Case 1 and FIG. 14 (B) shows the state of the ocean energy power generation device E being deformed by vortices, flows, and breaking waves around the submerged levee. 14A shows that in the case of Case 1, the ocean energy power generation device E is greatly deformed on the wave lower side due to the horizontal flow on the top end, before the wave breaking. 14B, in Case 2, it can be seen that the ocean energy power generation device E is greatly deformed on the wave lower side due to entrained bubbles and horizontal vortices associated with breaking waves.

  Furthermore, when FIG. 15 is seen, in Case3, it is before wave breaking, but it turns out that the free end of the ocean energy power generation device E is greatly deformed up and down by wave motion.

  Moreover, when FIG. 16 is seen, in the case of Case4, it turns out that the ocean energy power generation device E is deform | transforming greatly, repeating submergence and protrusion.

  In response to the vortex, flow, and wave breaking phenomena at the position where the ocean energy power generation device is installed, the ocean energy power generation device E is bent and deformed. The output voltage has a characteristic electromotive force waveform corresponding to the vortex, flow, and breaking wave phenomena. From these, it can be seen that the ocean energy power generation device can be flexibly deformed and convert wave energy into electrical energy in any fluid field.

  Note that FIG. 17 shows a change with time of the output voltage generated from the ocean energy power generation device E in Case 1, and FIG. 18 shows a change with time of the output voltage generated from the ocean energy power generation device E in Case 2. When these electromotive force waveforms were integrated and converted into an average power value (mW), it was 0.0578 mW for Case 1, 0.0394 mW for Case 2, 0.0589 mW for Case 3, and 0.0557 mW for Case 4.

  If the size of the ocean energy power generation device used is about 50 to 100 per wavelength, it can be installed at a power generation efficiency of 14 to 27% (1 It is estimated that the role per piece is 0.27%.

  A cylindrical body (Bluff body) was fixed upstream of the uniform flow field, and the power generation characteristics when the ocean energy power generation device was deformed by the turbulent flow / vortex field generated in the subsequent flow were verified. This is verification related to power generation by tidal currents and eddies.

  A marine energy power generation device was made using a polyvinylidene fluoride (PVDF) piezoelectric film (thickness 110 μm) (made by Kureha Chemical Co., Ltd.) as a piezoelectric film, a silicon sheet as an inner elastic plate and an outer elastic plate. The created ocean energy power generation device has a distance between piezoelectric films (inner elastic plate thickness) δ = 5 mm, each outer elastic plate thickness 0.5 mm, device thickness H = 6 mm, length 28.5 cm, and width 4 cm. . Hereinafter, this ocean energy power generation device is referred to as ocean energy power generation device F.

The cylinder has a diameter of 11.5 cm, a uniform flow velocity of 0.74 m / sec, a distance between the cylinder and the ocean energy power generation device F of 19 cm, and a Reynolds number of 8.51 × 10 ⁴ .

  FIG. 19 shows a state of the ocean energy power generation device F that is deformed by the turbulent flow and vortex energy in the wake of the cylinder. FIG. 20 shows a change with time of the electromotive force output from the ocean energy power generation device F.

  19 and 20, it can be seen that the flexible ocean energy power generation device F repeatedly deforms quasi-periodically due to the turbulent / vortex energy in the wake of the cylinder, and as a result, generates a large output voltage. . Therefore, it was proved that the ocean energy power generation device F can generate power even by turbulent flow / eddy energy.

  The power storage device 5 shown in FIG. 10 was configured to attempt to store power generated from the ocean energy power generation device. A marine energy power generation device was prepared using a polyvinylidene fluoride (PVDF) piezoelectric film (80 μm thickness) (manufactured by Kureha Chemical Co., Ltd.) as a piezoelectric film and a silicon sheet as an inner elastic plate and an outer elastic plate. The created ocean energy power generation device has a distance between piezoelectric films (inner elastic plate thickness) δ = about 1 mm, each outer elastic plate thickness 0.5 mm, device thickness H = about 2 mm, length about 17 cm, width about 1. 7 cm. Hereinafter, this ocean energy power generation device is referred to as ocean energy power generation device G. A capacitor was used as the power storage unit.

  FIG. 21 shows the change with time of the output voltage from the ocean energy power generation device G, and FIG. 22 shows the change with time of the stored voltage. As can be seen from FIG. 22, it can be stored with time. Therefore, by installing this power storage device in the ocean, it is possible to improve a small-scale to large-scale power generation facility.

  In the ocean energy power generation device according to the present invention, an inner elastic plate made of a flexible elastic material is sandwiched between a pair of flexible piezoelectric films, and further, an outer elastic plate made of a flexible elastic material is held between the pair of piezoelectric films. It is the structure to do. Since any piezoelectric film is bent and deformed away from the neutral axis of the ocean energy power generation device, any piezoelectric film will be stretched or shrunk entirely, and the generated voltage in the piezoelectric film will not be canceled out and is high. Voltage is output. And since the ocean energy power generation device is very flexible, it receives various ocean energy such as tidal currents and tidal waves, flexibly deforms and generates electricity, so it uses various ocean energy without choosing the installation location in the ocean. It can be used for power generation facilities.

DESCRIPTION OF SYMBOLS 1 Ocean energy power generation device 2 Ocean energy power generation device 3 Ocean energy power generation device 4 Ocean energy power generation device 5 Power storage device 11 Inner elastic board 12 Piezoelectric film 12a Piezoelectric film 12b Piezoelectric film 13a Outer elastic board 13b Outer elastic board 14a Piezoelectric film 14b Piezoelectric film 15a Outer elastic plate 15b Outer elastic plate 21a Wiring 21b Wiring 22a Wiring 22b Wiring 23a Wiring 23b Wiring 31 Rectifier 32 Power storage unit

Claims (6)

A marine energy power generation device that is installed in the ocean and converts ocean energy into electrical energy,
An inner elastic plate made of a flexible elastic material;
A pair of piezoelectric films sandwiching the inner elastic plate;
A pair of outer elastic plates made of a flexible elastic material and sandwiching the pair of piezoelectric films, and
Each of the pair of piezoelectric films is separated from a neutral axis of the ocean energy power generation device, and each of the pair of piezoelectric films is separated from the neutral axis of the ocean energy power generation device when the ocean energy generation device is bent. And flex to generate electricity,
A marine energy power generation device characterized by that.   The ocean energy power generation device according to claim 1, wherein the pair of outer elastic plates have the same thickness.   The marine energy power generation device according to claim 2 or 3, wherein the flexible elastic material is silicon rubber, natural rubber, or synthetic rubber.   The relationship between the distance (δ) between the pair of piezoelectric films and the thickness (H) of the ocean energy power generation device is 0.8 <δ / H <1. Marine energy power generation device as described in.   The pair of piezoelectric films and the pair of outer elastic plates are alternately laminated so as to sandwich the pair of outer elastic plates. Marine energy power generation device. A marine energy power generation device according to any one of claims 1 to 5;
A rectifier connected to the ocean energy power generation device;
A power storage unit connected to the rectifier,
A power storage device.