Wave energy concentrating device based on floating flexible plate

Abstract

The present application relates to a kind of wave energy convergence device based on floating flexible flat, including flexible flat, mooring chain, seabed anchor block and wave power generation device;Mooring chain two ends are connected to flexible flat and seabed anchor block respectively;The thickness of flexible flat gradually increases from one end of flexible flat to the other end, recess is arranged in the middle of flexible flat and extends from one end of flexible flat to the other end;Wave power generation device is arranged in the back of the recess of flexible flat.Wave can form hydroelastic wave that spreads on flexible flat when wave is incident to the front edge end of flexible flat.Hydroelastic wave is transmitted at the back end of flexible flat, and wave enters the water surface behind flexible flat.Wave power generation device is arranged in the back of the recess of flexible flat, and it is the place where wave height and wave energy density are maximum due to the influence of the effect of hydroelastic wave convergence by flexible flat, so potential energy and kinetic energy of wave can be converted into mechanical energy and electric energy to the greatest extent, and flexible flat will not hinder the natural flow of water body, and the construction and installation cost is low.

Description

Technical Field

[0001] This invention belongs to the field of new energy technology, specifically relating to a wave energy gathering device based on a floating flexible flat plate. Background Technology

[0002] my country has abundant marine energy reserves, among which wave energy accounts for a large proportion and has many advantages: 1) Wave energy has a higher spatial energy density than wind and solar energy; 2) Wave energy development has a small environmental impact and is one of the cleanest and safest energy sources; 3) Wave energy is highly predictable and mainly varies with the seasons; 4) Wave energy is mostly developed in nearshore areas, with short transmission distances and low consumption.

[0003] Wave power generation devices mainly include oscillating water column type, oscillating body type, and wave-overtaking type, which are arranged in a point or line pattern on the sea surface to absorb and convert wave energy into electrical energy. Existing technologies mainly improve the power generation efficiency by improving and optimizing the design of wave power generation devices.

[0004] Existing technology discloses a "hybrid device and installation method of oscillating buoy and parabolic floating box breakwater," which includes a parabolic floating box breakwater, an anchoring system ring, an oscillating buoy, a buoy ring, an anchor chain, an anchor block, and a power generation system. An anchoring system ring is installed at the bottom of the parabolic floating box breakwater unit; the oscillating buoy is installed in front of the wave-facing side of the parabolic floating box breakwater unit; a buoy ring is installed at the bottom of the oscillating buoy; an anchor chain is connected to both the buoy ring and the anchoring system ring; one end of the anchor chain is connected to an anchor block, which is placed on the seabed; the power generation system is installed inside the oscillating buoy. The parabolic floating box breakwater gathers waves in front of the wave-facing side, and the oscillating buoy is positioned at the wave-gathering point in front of the breakwater to maximize wave energy capture. The oscillating buoy, excited by the waves, generates electricity using the mechanical energy of its oscillating motion.

[0005] It has the following technical problems:

[0006] 1) Parabolic floating breakwaters, as a type of wave-reflecting and concentrating device, are subjected to large hydrodynamic loads.

[0007] 2) The construction and installation costs of the pontoon and its mooring system are high.

[0008] 3) Parabolic floating breakwaters have a deep draft, and the submerged structure can obstruct the natural flow of water. Summary of the Invention

[0009] To address the technical problems existing in the prior art, the purpose of this invention is to provide a wave energy gathering device based on a floating flexible flat plate, which has high energy efficiency and economy in wave power generation, does not obstruct the natural flow of water, has a simple structure, is easy to install, and has low construction and installation costs.

[0010] The objective of this invention is achieved through the following technical solution:

[0011] A wave energy collection device based on a floating flexible flat plate includes a flexible flat plate, a mooring anchor chain, a seabed anchor block, and a wave power generation device.

[0012] The mooring chain is connected at both ends to a flexible flat plate and a seabed anchor block, respectively.

[0013] The thickness of the flexible plate gradually increases from one end to the other, and a groove extending from one end to the other is provided in the middle of the flexible plate.

[0014] The wave power generation device is located behind the flexible flat plate groove.

[0015] Furthermore, the longitudinal section of the groove is arc-shaped.

[0016] Furthermore, the arc-shaped longitudinal section of the groove gradually increases from one end of the flexible plate to the other.

[0017] Furthermore, the cross-section of the groove is arc-shaped.

[0018] Furthermore, the arc-shaped cross-section of the groove has a smaller thickness in the middle and a larger thickness at both ends.

[0019] Furthermore, the thickness of the groove's transverse centerline is uniform.

[0020] Furthermore, the wave power generation device includes an oscillating float and a mechanical device connected to the oscillating float, with the oscillating float positioned behind the groove of the flexible flat plate.

[0021] Furthermore, there are four mooring chains and four seabed anchor blocks, with each of the four mooring chains corresponding to one of the four corners of the flexible plate and one of the four seabed anchor blocks.

[0022] Furthermore, each of the four corners of the flexible flat plate is equipped with an anchor chain lifting ring, which is connected to the mooring anchor chain.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] When a wave is incident on the leading edge of a flexible plate, the plate's thickness gradually increases from one end to the other, with the leading edge having the smallest thickness and lowest bending stiffness. Therefore, wave reflection at the leading edge is minimal, and most of the wave energy excites the flexible plate after impact. The water surface and the flexible plate oscillate together, forming a hydroelastic wave that propagates along the plate. The propagation speed of the hydroelastic wave is affected by the stiffness of the flexible plate; higher stiffness results in a faster propagation speed, while lower stiffness results in a slower propagation speed. Because the flexible plate has a groove extending from one end to the other, the stiffness on both sides of the groove increases rapidly due to the increased thickness. Therefore, the propagation speed of the hydroelastic wave on both sides of the groove is greater than the wave speed at the center line of the groove. The hydroelastic waves on both sides of the groove deflect towards the center of the groove, increasing the wave height at the rear center of the groove. The hydroelastic wave is then transmitted through the rear of the flexible plate, entering the water surface behind it. The wave power generation device is located behind the flexible plate groove. This location is influenced by the water elastic wave convergence effect of the flexible plate, which is the place with the maximum wave height and wave energy density. Therefore, the potential energy and kinetic energy of the waves can be converted into mechanical energy and electrical energy to the greatest extent, thus improving the energy efficiency and economy of wave power generation.

[0025] This invention uses a flexible flat plate floating on the water surface as a transmission wave-gathering device. It has a very small draft and negligible immersion depth, resulting in a small hydrodynamic load. It does not obstruct the natural flow of water and eliminates the need for floating breakwaters and their mooring systems. The floating flexible flat plate has a simple structure, is easy to install, and has low construction and installation costs. Attached Figure Description

[0026] Figure 1 This is a three-dimensional structural schematic diagram of an embodiment of the present invention;

[0027] Figure 2 This is a schematic diagram of the transverse side view structure according to an embodiment of the present invention;

[0028] Figure 3 This is a longitudinal side view structural diagram of an embodiment of the present invention;

[0029] Figure 4 yes Figure 2 Schematic diagram of midsection AA;

[0030] Figure 5 yes Figure 2 Schematic diagram of mid-section BB;

[0031] Figure 6 yes Figure 3 A schematic diagram of the midsection CC.

[0032] In the picture:

[0033] 1-Flexible flat plate, 2-Oscillating float, 3-Mooring chain, 4-Seabed anchor block. Detailed Implementation

[0034] The present invention will now be described in further detail.

[0035] like Figures 1-6 As shown, a wave energy gathering device based on a floating flexible flat plate includes a flexible flat plate 1, a mooring anchor chain 3, a seabed anchor block 4, and a wave power generation device.

[0036] The two ends of the mooring chain 3 are connected to the flexible flat plate 1 and the seabed anchor block 4, respectively.

[0037] The thickness of the flexible plate 1 gradually increases from one end to the other. The flexible plate 1 has a groove in the middle that extends from one end to the other. One end of the flexible plate 1 is arranged facing the direction of wave incidence.

[0038] The wave power generation device is located behind the groove of the flexible flat plate 1.

[0039] A flexible plate 1 floats on the water surface. When a wave strikes the leading edge of the flexible plate 1, because the thickness of the flexible plate 1 gradually increases from one end to the other, with the leading edge having the smallest thickness and lowest bending stiffness, wave reflection at the leading edge is minimal. Most of the wave energy, after being incident, excites the flexible plate 1, causing the water surface and the flexible plate 1 to oscillate up and down together, forming a hydroelastic wave propagating on the flexible plate 1. The propagation speed of the hydroelastic wave is affected by the stiffness of the flexible plate 1; a higher stiffness results in a faster propagation speed, while a lower stiffness results in a slower propagation speed. Because the flexible plate 1 has a groove extending from one end to the other in its middle, the stiffness on both sides of the groove increases rapidly due to the increased thickness. Therefore, the propagation speed of the hydroelastic wave on both sides of the groove is greater than the wave speed at the center line of the groove. The hydroelastic waves on both sides of the groove simultaneously deflect towards the center of the groove, increasing the wave height at the middle of the rear end of the groove. The hydroelastic wave is transmitted at the rear end of the flexible plate 1, and the wave enters the water surface behind the flexible plate 1. The wave power generation device is located behind the groove of the flexible plate 1. This location is influenced by the water elastic wave convergence effect of the flexible plate 1, which is the place with the maximum wave height and wave energy density. Therefore, the potential energy and kinetic energy of the waves can be converted into mechanical energy and electrical energy to the maximum extent, thus improving the energy efficiency and economy of wave power generation.

[0040] Specifically, the wave energy gathering device in this embodiment includes a floating plate device, a wave power generation device, and an anchoring device.

[0041] The floating plate device is a rectangular flexible plate 1 that floats on the water surface. The thickness of the flexible plate 1 increases continuously along the longitudinal direction (wave propagation direction), and the thickness is smallest at the middle and largest at the two edges along the transverse direction (perpendicular to wave propagation). The flexible plate 1 has a wedge-shaped structure that is thinner at the front and thicker at the rear, with an arc-shaped longitudinal groove in the middle. The intersection line between the upper surface of the wedge structure and the groove is a parabola. The arc-shaped longitudinal section of the groove gradually increases from one end of the flexible plate 1 to the other. The thickness of the bottom of the groove is equal from the front to the rear. Anchor chain lifting rings are installed at the four corners of the rectangular flexible plate 1 for anchor chain installation.

[0042] The wave power generation device is an oscillating float 2 located behind the flexible plate 1 on the transverse axis of symmetry. The oscillating float 2 includes an oscillating float and a mechanical device connected to the oscillating float. The oscillating float is located behind the groove of the flexible plate 1, at the point where the wave height and wave energy density are the greatest, and can convert the potential energy and kinetic energy of the wave into mechanical energy and electrical energy to the greatest extent.

[0043] The mooring device includes four mooring chains 3 and four seabed anchor blocks 4 connecting the flexible plate 1 to the seabed. One end of the mooring chain 3 is connected to the chain swivel at the edge of the flexible plate 1, and the other end is connected to the seabed anchor block 4.

[0044] In this embodiment of the invention, the stiffness distribution of the floating flexible plate 1 can be determined by its thickness. An ideal stiffness distribution can be obtained by designing the thickness distribution of the flexible plate 1. The stiffness of the floating flexible plate 1 increases continuously along the longitudinal direction. The stiffness of the leading edge of the flexible plate 1 is smaller, which can reduce the reflection of incident waves and enable the floating structure to collect as much wave energy as possible. The stiffness of the floating flexible plate 1 is smaller in the middle and larger at both sides in the transverse direction. The transverse distribution of the stiffness of the flexible plate 1 is to change the propagation direction of the hydroelastic wave and concentrate the energy onto the wave power generation device behind the transverse central axis of the flexible plate 1.

[0045] The immersion depth of the floating flexible plate 1 is negligible, and it experiences minimal hydrodynamic loads in the water. The floating flexible plate 1 floats completely on the water surface and does not obstruct the natural flow of water. The floating flexible plate 1 has a simple structure, is easy to install, and has low construction and installation costs.

[0046] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.

Claims

1. A wave energy concentrating device based on a floating flexible flat plate, characterized in that: This includes flexible flat plates for floating on the water surface, mooring chains, seabed anchor blocks, and wave power generation devices; The mooring chain is connected at both ends to a flexible flat plate and a seabed anchor block, respectively. The thickness of the flexible plate gradually increases from one end to the other along the wave incident direction. A groove is provided in the middle of the flexible plate, extending from one end to the other along the wave incident direction. The groove has a uniform thickness along the center line of the wave propagation direction, and the longitudinal section at other positions is arc-shaped. The cross-section of the groove is also arc-shaped. The wave power generation device is positioned behind the flexible flat plate groove along the wave incident direction. The arc-shaped longitudinal section of the groove gradually increases from one end of the flexible plate to the other along the incident direction of the wave; The groove has a curved cross-section with a smaller thickness in the middle and a larger thickness at both ends.

2. A wave energy concentrating device based on a floating flexible flat plate according to claim 1, characterized in that: The wave power generation device includes an oscillating float and a mechanical device connected to the oscillating float, which is located behind a groove in a flexible flat plate.

3. A wave energy concentrating device based on a floating flexible flat plate according to claim 1, characterized in that: There are four mooring chains and four seabed anchor blocks. The four mooring chains are connected to the four corners of the flexible plate and the four seabed anchor blocks respectively.

4. A wave energy concentrating device based on a floating flexible flat plate according to claim 3, characterized in that: Anchor chain shackles are provided at the four corners of the flexible flat plate, and the anchor chain shackles are connected to the mooring anchor chains.

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