CN214998007U

CN214998007U - Wave energy power supply buoy with single-degree-of-freedom motion

Info

Publication number: CN214998007U
Application number: CN202120545472.0U
Authority: CN
Inventors: 张亚群; 吴必军; 周逸伦; 盛松伟
Original assignee: Guangzhou Institute of Energy Conversion of CAS
Current assignee: Guangzhou Institute of Energy Conversion of CAS
Priority date: 2021-03-16
Filing date: 2021-03-16
Publication date: 2021-12-03
Anticipated expiration: 2031-03-16

Abstract

The utility model discloses a wave energy power supply buoy with single degree of freedom movement, which comprises a buoy body, an instrument frame, a wave energy power generation device, a storage battery, a control system and an anchoring device, wherein the buoy body comprises a tail pipe, a curve central pipe, a main buoy and a contraction pipe, the main buoy comprises a buoy body and a motion suppression curve part, and the tail pipe is connected with the buoy body; the curved central pipe is arranged in the buoy body; the telescopic pipe is arranged at the top of the buoy body, and a closed cavity is formed among the buoy body, the curved central pipe and the telescopic pipe; the instrument frame is arranged at the top of the buoy body; the storage battery and the control system are arranged at the top of the instrument frame; the wave energy power generation device is arranged at the top of the shrinkage pipe; the tail pipe is anchored with the underwater ground through the anchoring device. The wave energy power supply buoy moving with the single degree of freedom can capture waves in any direction, converts the waves into the heaving motion of the buoy, effectively inhibits the motion of other degrees of freedom, and realizes efficient capture of wave energy.

Description

Wave energy power supply buoy with single-degree-of-freedom motion

Technical Field

The utility model relates to a wave energy power supply technical field specifically is a wave energy power supply buoy of single degree of freedom motion.

Background

The buoy is of a structure floating on the water surface. The most common buoy is a navigation mark, is an important facility for ensuring the safety and economic navigation of ships, plays an important role in developing water traffic transportation, ocean resource development, fishery fishing, national defense construction and the like, and plays a certain auxiliary role in research work of ocean science. The navigation mark generally has four functions, namely a positioning function, a danger warning function, a confirmation function and a traffic indicating function. The other buoys can have the functions of measurement, signal transmission and reception and the like.

The energy of the buoy is mainly electric energy which can be divided into conventional electric energy and renewable electric energy. The conventional electric energy is usually supplied by a storage battery, and the storage battery needs to be replaced periodically; there is also a scheme of supplying power to the buoy from shore-based electric energy through an underwater cable, and the underwater cable needs to be laid. The renewable electric energy source is used for supplying power to the buoy by using electric energy generated by renewable natural energy, has the advantages of energy collection and power generation on site, avoidance of battery replacement or underwater cable laying, cleanness, no pollution, abundant reserves, sustainable utilization, long maintenance period, convenience in use and the like, and has great development potential.

The solar buoy converts solar energy into electric energy by using the solar cell and stores the electric energy in the storage battery for the buoy to use. The solar cell is widely applied to the buoy at present, and has the advantages of reproducibility, no noise and no pollution; the equipment is simple and has no moving parts; the service life is long, and the maintenance is simple; the output power is relatively stable. The solar cell panel is firstly easily damaged and polluted by external factors, the surface of the solar cell panel is easily covered by salt fog, a salt layer is gradually formed, the solar illumination is influenced, the power generation efficiency is reduced, power generation cannot be completely realized in serious cases, manual washing is needed, and power generation is recovered; the performance of the solar cell is reduced in cloudy days, and the solar cell cannot work at night; solar panels are easily damaged under extreme sea conditions; the problem of small incident angle exists in high latitude areas.

The wave energy buoy utilizes wave energy around the buoy to generate electricity by means of the wave energy power generation buoy to continuously supply power to the storage battery. The wave energy is a renewable energy source with large content, high quality, cleanness and all weather, and meanwhile, the buoy is mainly applied to a floating device on the sea or river, realizes self-sufficiency of the buoy energy by utilizing wave energy power generation, and has convenience, feasibility and operability. Until now, the pneumatic wave power generation buoy in practical application has a wave gathering effect due to the adoption of a cylindrical structure, and the effective movement of the buoy is heaving movement. However, in the actual sea state operation process, the buoy often moves in multiple degrees of freedom, and the reliability, the stability and the wave absorption efficiency of the buoy are all adversely affected.

SUMMERY OF THE UTILITY MODEL

Not enough to prior art, the utility model provides a wave energy power supply buoy of single degree of freedom motion can effectively restrain the motion of other degrees of freedom except that dangling, improves the following wave nature, conversion efficiency, stability and the reliability of buoy.

In order to achieve the purpose, the utility model discloses a wave energy power supply buoy of single degree of freedom motion, including the mark body and anchor, the mark body has tail pipe, curve center tube, main flotation pontoon and shrink tube, main flotation pontoon includes the flotation pontoon body and installs in the motion suppression curve portion of flotation pontoon body both sides, the upper portion of tail pipe with this body coupling of flotation pontoon, the curve center tube is installed in this body of flotation pontoon, and the curve center tube coincides with the axis of flotation pontoon body, be seal structure between the outer wall of curve center tube and the inner wall of flotation pontoon body; the retractable pipe is arranged at the top of the buoy body and is positioned on the central axis of the buoy body, a communicated closed cavity is formed among the buoy body, the curve central pipe and the retractable pipe, the tail pipe is anchored with the ground at the bottom of the water through an anchoring device, wherein,

the outer edge on the vertical cross section of the motion suppression curve part is in a nonlinear curve shape, when the buoy is unbalanced in wave force on the left and the right, the nonlinear curve of the overall appearance of the main buoy is more submerged along with one side, the drainage volume is increased more quickly, the buoyancy increment on the side is larger than the wave force reduction value, and the buoy returns to a normal floating state.

The wave energy power supply buoy with single degree of freedom motion further comprises a wave energy power generation device arranged at the top of the contraction pipe, wherein,

under the action of waves, the buoy body of the buoy makes reciprocating heaving motion, so that a water column in the tail pipe makes relative oscillating motion in the pipe;

when wave crests act on the buoy, waves push the buoy to move upwards integrally, a water column in the main buoy moves downwards relative to the cylinder wall, the volume of gas in the main buoy is increased, the gas pressure is reduced, outside air enters the contraction pipe through the wave energy power generation device under the pressure, and the wave energy power generation device generates power;

when the wave trough acts on the buoy, the buoyancy of the buoy is reduced, the buoy moves downwards integrally under the action of gravity, the water column in the main buoy moves upwards relative to the cylinder wall, the volume of gas in the main buoy is reduced, the gas pressure is increased, the pressure in the buoy body is discharged into the air through the wave energy power generation device, and the wave energy power generation device generates power.

The wave energy power supply buoy with single degree of freedom motion is characterized in that the buoy body further comprises a wave blocking plate, the wave blocking plate is arranged on one side of the tail pipe, and two ends of the wave blocking plate are respectively connected with the tail pipe and the motion suppression curve part.

The wave energy power supply buoy with single degree of freedom motion further comprises an instrument frame, a storage battery and a control system, wherein the instrument frame is installed at the top of the buoy body, and the central axis of the instrument frame is coincident with the central axis of the buoy body; the storage battery and the control system are arranged at the top of the instrument frame; the wave energy power generation device is arranged below the instrument frame; the wave energy power generation device and the storage battery are electrically connected with the control system respectively.

The wave energy power supply buoy with single degree of freedom motion is characterized in that the instrument frame is of a truss structure, a solar power generation system, an indicator light and a mast are further mounted at the top of the instrument frame, and the solar power generation system and the indicator light are respectively and electrically connected with the control system.

The wave energy power supply buoy with single-degree-of-freedom motion further comprises anchor chains arranged on two opposite sides of the tail pipe and anchor blocks arranged at the bottom ends of the anchor chains.

According to the wave energy power supply buoy with single-degree-of-freedom motion, furthermore, side lines on two sides of the vertical section of the curve central pipe in the horizontal direction are in a streamline curve shape.

The wave energy power supply buoy with single degree of freedom motion further comprises a wave blocking plate, wherein the vertical section of the wave blocking plate is triangular, two ends of the wave blocking plate on the side where the longest edge is located are respectively connected to the tail pipe and the motion suppression curve part, and the length of the edge is equal to the vertical distance from the bottom of the tail pipe to the top of the motion suppression curve part.

The wave energy power supply buoy with single-degree-of-freedom motion is characterized in that the tail pipe is a hollow cone.

The wave power supply buoy with single-degree-of-freedom motion is characterized in that the contraction pipe is of a cone frustum cylindrical structure with a wide lower part and a narrow upper part, a plurality of overflow valves are uniformly arranged on the side wall of the contraction pipe, a plurality of porous flanges are arranged at the top of the contraction pipe, and the wave power generation device is arranged on the contraction pipe through at least one porous flange.

Compared with the prior art, the utility model, its beneficial effect lies in:

1. according to the wave energy power supply buoy with the single degree of freedom motion, the main buoy formed by the buoy body and the motion suppression curve part is adopted, the wave energy capturing performance is improved, the wave energy power supply buoy can be used as a stable base body of the buoy body, and the safety of various devices on the buoy is improved; meanwhile, the main buoy can be used as a stable maintenance platform, and safety guarantee is provided for the buoy during real sea condition operation.

2. According to the wave energy power supply buoy with single-degree-of-freedom motion, the buoy can move with 6 degrees of freedom during movement, and except for heaving movement and yawing movement, the movement in other degrees of freedom directions can be in a state that the buoy is unbalanced in wave force left and right. When the wave force acting on the two sides of the main buoy is unbalanced, the buoy inclines, and the water inlet volume of the side with smaller wave force is gradually increased. The motion suppression curve part is designed according to the motion characteristic of the water particle, namely, the overall appearance of the main buoy is a special nonlinear curve, the more water enters from one side, the faster the water discharge volume is increased, the value of the side buoyancy is increased to be larger than the wave force reduction value, and the buoy returns to a normal floating state. Therefore, the movement of the buoy in the directions of four degrees of freedom is effectively inhibited. In addition, the yawing motion of the buoy is substantially limited by the arrangement of the wave blocking plates and the anchoring devices. The wave blocking plate can realize that the buoy can be quickly aligned to the incoming wave direction to prevent the anchor chain from winding, and can effectively guide the buoy to reciprocate in the vertical direction when the buoy does heaving motion. Therefore, the wave energy power supply buoy with single-degree-of-freedom motion can capture waves in any direction, converts the waves into the heaving motion of the buoy, effectively inhibits the motion of other degrees of freedom, and realizes the efficient capture of wave energy.

3. The wave energy power supply buoy of single degree of freedom motion of this application, the cavity of curve center tube adopts the streamline design of taking the shrink performance, and the flow velocity of multiplicable air reduces the loss of energy when the air moves.

4. The wave energy power supply buoy moving with the single degree of freedom is designed through the contraction pipeline with the cone frustum tube shape, so that the moving speed of air is accelerated, more wave energy is obtained, and the wave energy power generation device is convenient to install and replace conveniently.

5. According to the wave energy power supply buoy with single degree of freedom movement, 1 or more wave energy power generation devices can be installed on the buoy at the same time, and the rated installed power of the buoy is flexibly controlled. Therefore, when the wave energy power generation device works under different sea conditions, the quantity of the wave energy power generation devices can be selected according to the wave energy resource condition, and the power generation efficiency is improved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a wave energy power supply buoy with single-degree-of-freedom motion in the embodiment of the application.

Reference numerals: 100. marking a body; 110. a tail pipe; 120. a curved center tube; 130. a main buoy; 131. a float body; 132. A motion suppression curve portion; 140. a shrink tube; 150. wave blocking plates; 200. an instrument stand; 300. a wave energy power generation device; 400. A storage battery; 500. a control system; 600. an anchoring device; 610. an anchor chain; 620. an anchor block; 700. a solar power generation system; 800. an indicator light; 900. a mast.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Example (b):

it should be noted that the terms "comprises" and "comprising," and any variations thereof, of embodiments of the present invention are intended to cover non-exclusive inclusions, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

It will be understood that the terms "central," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing and simplifying the invention, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting the invention.

In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise. Furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, as they may be fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a wave energy power supply buoy with single degree of freedom motion in an embodiment of the present application. The utility model provides a wave energy power supply buoy of single degree of freedom motion can effectively restrain the motion of other degrees of freedom except that dangling, improves the following wave nature, conversion efficiency, stability and the reliability of buoy.

In an alternative embodiment, referring to fig. 1, the wave energy power supply buoy with single degree of freedom motion comprises a buoy body 100, an instrument frame 200, a wave energy power generation device 300, a storage battery 400, a control system 500 and an anchoring device 600, wherein the buoy body 100 comprises a tail pipe 110, a curved central pipe 120, a main buoy 130 and a contraction pipe 140, the main buoy 130 comprises a buoy body 131 and motion suppression curve parts 132 arranged on two sides of the buoy body 131, and the buoy body 131 and the motion suppression curve parts 132 are integrally formed. The upper part of the tail pipe 110 is welded to the pontoon body 131. The curved central tube 120 is installed in the buoy body 131, the central axis of the curved central tube 120 coincides with the central axis of the buoy body 131, and a sealing structure is arranged between the outer wall of the curved central tube 120 and the inner wall of the buoy body 131. The contraction pipe 140 is installed on the top of the buoy body 131 and is located on the central axis of the buoy body 131, and a communicated closed cavity is formed among the buoy body 131, the curved central pipe 120 and the contraction pipe 140. The instrument holder 200 is screwed to the top of the float body 131, and the instrument holder 200 coincides with the central axis of the float body 131. The storage battery 400 and the control system 500 are screwed on the top of the instrument holder 200, and the control system 500 may be any one of the prior art. The wave energy power generation device 300 is mounted in a screwed manner on top of the shrink tube 140 and is disposed below the instrument holder 200. The tail pipe 110 is anchored to the underwater ground through the anchoring device 600, and the wave energy power generation device 300 and the storage battery 400 are respectively and electrically connected with the control system 500.

In this embodiment, the top of the instrument holder 200 is further screwed with a solar power generation system 700, an indicator light 800 and a mast 900, and the solar power generation system 700 and the indicator light 800 are electrically connected to the control system 500 respectively. The anchoring device 600 includes an anchor chain 610 installed on opposite sides of the tail pipe 110, and an anchor block 620 threadedly or welded to the bottom end of the anchor chain 610. The sign body 100 further includes a wave blocking plate 150, the wave blocking plate 150 is disposed at one side of the tail pipe 110, and both ends of the wave blocking plate 150 are respectively connected to the tail pipe 110 and the motion suppressing curve part 132.

The breakwater 150 may be any one of the prior art, such as a rectangular plate, etc. As a preferred embodiment of this embodiment, the vertical section of the wave blocking plate 150 is triangular, two ends of the wave blocking plate 150 on the side where the longest side is located are respectively connected to the tail pipe 110 and the motion suppressing curved portion 132, and the length of the side is equal to the vertical distance between the bottom of the tail pipe 110 and the top of the motion suppressing curved portion 132. The advantage of this arrangement is that the wave blocking plate 150 can make the buoy align to the incoming wave quickly, prevent the cable 610 from winding, and at the same time, effectively guide the buoy to reciprocate vertically when the buoy makes a heaving motion.

In the present embodiment, the tail pipe 110 is a cone with a hollow interior.

As a preferable implementation manner of the present embodiment, the shrinkage pipe 140 is a truncated cone cylindrical structure with a wide lower part and a narrow upper part, a plurality of relief valves are uniformly arranged on the side wall of the shrinkage pipe 140, a plurality of porous flanges are arranged on the top of the shrinkage pipe 140, and the wave energy power generation device 300 is mounted on the shrinkage pipe 140 through at least one porous flange. The pipeline design of the cone frustum cylindrical shrinkage pipe 140 is favorable for accelerating the moving speed of air and acquiring more wave energy, and the wave energy power generation device 300 is convenient to install and replace quickly. Meanwhile, 1 or more wave energy power generation devices 300 can be simultaneously installed on the buoy, and the rated installed power of the buoy can be flexibly controlled, so that the quantity of the wave energy power generation devices 300 can be selected and installed according to the wave energy resource condition when the buoy works under different sea conditions, and the power generation efficiency is improved.

In this embodiment, the instrument stand 200 is a truss structure.

In the present embodiment, the outer edge of the motion-suppressing curved portion 132 in a vertical section has a non-linear curved shape.

The curved center tube 120 may be any curved conduit known in the art, such as an S-shaped tube. As a preferred embodiment of this embodiment, the side lines of the two sides of the curved central tube 120 in the horizontal direction of the vertical cross section are streamline curves, and the cavity of the curved central tube 120 adopts a streamline design with contraction performance, so that the arrangement has the advantages of increasing the flow speed of the air and reducing the energy loss when the air moves.

The working principle is as follows:

the buoy is moored to the bottom of the water by anchor chains 610 and anchor blocks 620, with the main buoy 130 partially floating above the water surface and partially submerged below the water surface.

Under the action of waves, the buoy body 100 of the buoy makes reciprocating heave motion, so that the water column in the tail pipe 110 makes relative oscillation motion in the pipe. When wave crests act on the buoy, waves push the buoy to move upwards integrally, water columns in the main buoy 130 move downwards relative to the cylinder wall, the volume of gas in the main buoy 130 is increased, the gas pressure is reduced, outside air enters the shrinkage pipe 140 through the wave energy power generation device 300 under pressure, and the wave energy power generation device 300 generates power. When the wave trough acts on the buoy, the buoyancy of the buoy is reduced, the buoy moves downwards integrally under the action of gravity, the water column in the main buoy 130 moves upwards relative to the cylinder wall, the volume of gas in the main buoy 130 is reduced, the gas pressure is increased, the pressure in the buoy body is discharged into the air through the wave energy power generation device 300, and the wave energy power generation device 300 generates power.

The buoy can move with 6 degrees of freedom during movement, and except for heaving movement and yawing movement, the movements in other degrees of freedom can all generate a state that the buoy is unbalanced by wave force on the left and the right. When the wave forces acting on the two sides of the main buoy 130 are not balanced, the buoy tilts, and the water inlet volume of the side with smaller wave force gradually increases. Because the main buoy 130 forms a special non-linear curve overall, the displacement volume increases faster as more water enters one side, the side buoyancy increment is larger than the wave force reduction value, and the buoy returns to a normal floating state. Therefore, the movement of the buoy in the directions of four degrees of freedom is effectively inhibited. In addition, the yawing motion of the buoy is substantially limited by the breakwater 150 and the anchoring device 600. The wave blocking plate 150 enables the buoy to be quickly aligned to the incoming wave direction, prevents the anchor chain 610 from being entangled, and simultaneously can effectively guide the buoy to reciprocate in the vertical direction when the buoy does heaving motion.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and to implement the present invention, which cannot limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.

Claims

1. A wave energy power supply buoy with single degree of freedom movement comprises a buoy body and an anchoring device and is characterized in that the buoy body is provided with a tail pipe, a curve central pipe, a main buoy and a contraction pipe, the main buoy comprises a buoy body and motion suppression curve parts arranged on two sides of the buoy body, the upper part of the tail pipe is connected with the buoy body, the curve central pipe is arranged in the buoy body, the curve central pipe is coincided with the central axis of the buoy body, and a sealing structure is arranged between the outer wall of the curve central pipe and the inner wall of the buoy body; the telescopic pipe is installed at the top of the floating cylinder body and is located on the central axis of the floating cylinder body, the curve central pipe and the telescopic pipe are provided with communicated airtight cavities, and the tail pipe is anchored with the underwater ground through the anchoring device.

2. The wave energy power supply buoy for single degree of freedom motion of claim 1, characterized in that a wave energy power generation device is further mounted at the top of the shrink tube.

3. The wave energy power supply buoy for single-degree-of-freedom movement according to claim 1 or 2, characterized in that the buoy body further comprises a wave blocking plate, the wave blocking plate is arranged on one side of the tail pipe, and two ends of the wave blocking plate are respectively connected with the tail pipe and the movement restraining curve part.

4. The wave energy powered buoy of single degree of freedom motion of claim 2, further comprising an instrument rack, a storage battery and a control system, the instrument rack being mounted on the top of the buoy body and the instrument rack coinciding with the central axis of the buoy body; the storage battery and the control system are arranged at the top of the instrument frame; the wave energy power generation device is arranged below the instrument frame; the wave energy power generation device and the storage battery are electrically connected with the control system respectively.

5. The wave energy power supply buoy with single degree of freedom motion of claim 4, characterized in that the instrument frame is of a truss structure, a solar power generation system, an indicator light and a mast are further installed at the top of the instrument frame, and the solar power generation system and the indicator light are respectively and electrically connected with the control system.

6. The single degree of freedom motion wave energy powered buoy of claim 1, wherein the anchoring means comprises anchor chains mounted on opposite sides of the tailpipe and anchor blocks mounted at the bottom ends of the anchor chains.

7. The wave energy power supply buoy with single degree of freedom motion of claim 1, characterized in that sidelines on two sides of the vertical section of the curved central pipe in the horizontal direction are in a streamline curve shape.

8. The wave energy power supply buoy with single degree of freedom motion of claim 3, characterized in that the vertical section of the wave blocking plate is triangular, the two ends of the side of the longest edge of the wave blocking plate are respectively connected to the tail pipe and the motion suppression curve part, and the length of the edge is equal to the vertical distance between the bottom of the tail pipe and the top of the motion suppression curve part.

9. The single degree of freedom moving wave energy powered buoy of claim 1 wherein the tailpipe is a hollow cone inside.

10. The wave power supply buoy with single degree of freedom motion of claim 2, characterized in that the shrink tube is a cone frustum cylindrical structure with a wide lower part and a narrow upper part, a plurality of overflow valves are uniformly arranged and mounted on the side wall of the shrink tube, a plurality of porous flanges are arranged at the top of the shrink tube, and the wave power generation device is mounted on the shrink tube through at least one of the porous flanges.