Multi-cavity wave energy coupling power generation device for variable water depth breakwater

Abstract

The application relates to the technical field of ocean engineering and renewable energy, and discloses a wave energy coupling power generation device for a multi-cavity variable-water-depth breakwater, which comprises a caisson, a water inlet box is arranged in the caisson, an air chamber is arranged on the upper surface of the water inlet box, an air outlet pipe is arranged in the air chamber, a check rectifier valve group is in communication with the outer wall of the air outlet pipe, an air main pipe is in communication with the inside of the check rectifier valve group, the outer wall of the air main pipe penetrates the inside of the caisson and is in communication with a buffer pressure stabilizing tank, a generator set is arranged at the air outlet end of the buffer pressure stabilizing tank, a plurality of partitions are arranged in the water inlet box, and an arc-shaped plate is arranged in the middle of the connecting rod. With the propagation of waves, the waves are blocked by the partitions and surge upwards, push the arc-shaped plate to rotate, drive the moving mechanism, and through the cooperation of the cleaning frames, fixing seats and magnetic blocks on the two sides of the partitions, the impurities and silt deposits adhering to the edges of the through holes of the partitions are reciprocatingly scraped and disturbed and cleaned.

Description

Technical Field

[0001] This invention relates to the fields of marine engineering and renewable energy technology, specifically to a wave energy coupling power generation device for a multi-cavity variable-depth breakwater. Background Technology

[0002] With the increasing demand for marine renewable energy development, oscillating water column (OWC) wave energy devices, which utilize wave energy for power generation, are gradually becoming an important research direction in the field of wave energy utilization due to their relatively simple structure, strong adaptability, and ability to be integrated with marine engineering structures such as breakwaters. In existing technologies, some wave energy devices place the OWC air chamber inside a caisson breakwater. The oscillation of the liquid surface formed after waves enter the chamber compresses the air, driving an air turbine to generate electricity. This achieves wave energy generation while simultaneously providing wave protection and dissipation, improving the comprehensive utilization rate of marine engineering structures.

[0003] In existing multi-cavity variable-depth wave energy devices, adjacent chambers are usually separated by partitions. The lower side of the partitions has openings for seawater flow to maintain seawater exchange and wave propagation between chambers. At the same time, in order to balance the pressure in some areas, improve the water flow disturbance state, or assist the coupling of air and water, some partitions also have through-hole structures on the upper side, so that local water flow or air flow can be connected between adjacent chambers, thereby improving the continuity of wave propagation and pressure transmission effect.

[0004] However, since these devices operate in a marine environment for extended periods, seaweed, barnacles, shellfish, biofilms, and sediment in the seawater easily adhere to and accumulate at the edges of the partition's through-holes. This is especially true when the through-holes are located above the partition openings, where localized backflow zones and low-velocity eddies can easily form, making it easier for suspended impurities to deposit around the through-holes. As operating time increases, the edges of the through-holes gradually become clogged, narrowed, or develop thicker deposits, thus affecting the fluid connectivity between adjacent stepped chambers. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a wave energy coupling power generation device for multi-cavity variable-depth breakwaters, which solves the problem that impurities in seawater can easily cause blockage or thickening of the adhesion layer at the edge of the through-holes as the operating time increases.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a wave energy coupling power generation device for a multi-cavity variable-depth breakwater, comprising a caisson, an inlet tank installed inside the caisson, an air chamber installed on the upper surface of the inlet tank, an outlet pipe installed inside the air chamber, a check valve assembly connected to the outer wall of the outlet pipe, an air header connected to the inner wall of the check valve assembly, the outer wall of the air header penetrating the interior of the caisson and connected to a buffer pressure stabilizing tank, a generator set installed at the outlet end of the buffer pressure stabilizing tank, multiple partitions installed inside the inlet tank, openings and through holes in the partitions, one end of a torsion spring installed inside the inlet tank, a connecting rod installed at the other end of the torsion spring, both ends of the connecting rod rotatably connected to the interior of the inlet tank, an arc-shaped plate installed in the middle of the connecting rod, and a moving mechanism installed on the outer wall of the connecting rod.

[0007] The above scheme involves a stepped bottom in the inlet tank that works in conjunction with multiple baffles to form several stepped chambers. The bottom elevation of each chamber changes sequentially in steps, creating a wave modulation channel with a fixed and variable water depth. The baffles have openings and through holes inside. The lower openings are for seawater flow, while the upper through holes are for chamber air pressure coupling, pressurization, and exhaust. With the arc-shaped plate, when the seawater flow is higher than the baffle opening, the seawater is blocked by the baffle and surges upward, thereby driving the arc-shaped plate to rotate and transmitting power to the moving mechanism.

[0008] Preferably, the moving mechanism includes a mechanical box, the interior of which is disposed on the outer wall of the connecting rod, the outer wall of which is installed on the inner wall of the water inlet tank, and a gear is disposed inside the mechanical box, the gear being installed inside the outer wall of the connecting rod.

[0009] Preferably, the gear teeth are meshed with a toothed plate, a movable frame is mounted on the upper surface of the toothed plate, and the outer wall of the movable frame is slidably connected to the inside of the mechanical box.

[0010] Preferably, a cleaning frame is installed on the outer wall of the movable frame, the outer wall of the cleaning frame is set on the outer wall of the partition, a fixed seat is slidably connected inside the cleaning frame, the outer wall of the fixed seat is installed on the outer wall of the partition, and a magnetic block is installed on the side of the cleaning frame near the partition.

[0011] Preferably, a moving rod is mounted on the upper surface of the moving frame, and a hollow cylinder is slidably connected to the outer wall of the moving rod. The outer wall of the hollow cylinder is mounted on the inner wall of the air chamber, and a piston is mounted at the top of the moving rod. The outer wall of the piston is slidably connected to the inside of the hollow cylinder.

[0012] Preferably, the hollow cylinder has an internal gas supply pipe, the outer wall of the gas supply pipe is connected to the inside of the gas outlet pipe, and a one-way disc is installed inside the gas supply pipe.

[0013] Preferably, the outer wall of the air supply pipe is provided with a support plate, the outer wall of the support plate is slidably connected to the inner wall of the air chamber, and counterweights are installed around the support plate.

[0014] Preferably, one end of the corrugated pipe is connected to the inside of the support plate, and the other end of the corrugated pipe is connected to the inside of the air outlet pipe.

[0015] Preferably, one end of a helical spring is mounted on the upper surface of the support plate, and the other end of the helical spring is mounted on the inner wall of the air chamber.

[0016] Preferably, a limiting rod is installed on the upper surface of the support plate, and the outer wall of the limiting rod is slidably connected to the inside of the air chamber.

[0017] This invention provides a wave energy coupling power generation device for multi-cavity variable-depth breakwaters. It has the following beneficial effects: 1. This invention forms a stepped chamber through the cooperation of the inlet tank, air chamber, and partition. The power supply for the generator set is provided through the outlet pipe, check valve group, air header, and buffer pressure stabilizing tank. As the waves propagate, they surge upwards after being blocked by the partition, pushing the arc plate to rotate and driving the moving mechanism. Through the cooperation of the cleaning racks, fixed seats, and magnetic blocks on both sides of the partition, impurities and sediments attached to the edges of the partition through holes are repeatedly scraped and disturbed, preventing the through holes from becoming blocked or narrowed due to the accumulation of marine deposits. This ensures the seawater flow capacity and pressure transmission stability between the stepped chambers. At the same time, it uses the waves themselves as the driving force, achieving self-cleaning operation without the need for an additional power source, reducing the frequency of offshore maintenance.

[0018] 2. This invention moves the moving frame, which drives the moving rod and piston to move inside the hollow cylinder, thereby pushing the gas through the gas supply pipe to the inside of the gas outlet pipe. The gas collected through the gas outlet pipe by the additional pressurized air header and check valve group realizes the secondary utilization of wave energy, mechanically assists the pressurization of the airflow in the main air chamber, increases the airflow pressure, and at the same time stabilizes the multi-chamber output airflow and reduces airflow pulsation.

[0019] 3. In this invention, when the liquid level is too high, it affects the height at which the seawater is lifted. After the seawater is lifted, it compresses the air in the upper part of the chamber, allowing the support plate to overcome its own weight and the elastic force of the helical spring. The support plate moves up to a suitable distance, avoiding insufficient space for seawater to rise, which would result in too little compressed air and insufficient air pressure. This ensures that the air outlet pipe and the check valve assembly can stably collect reciprocating airflow, while also adapting to high water level wave conditions and broadening the applicable tidal range of the device. Attached Figure Description

[0020] Figure 1 This is a perspective view of the present invention; Figure 2 This is a cross-sectional view of the internal structure of the water inlet tank of the present invention; Figure 3 This is a partial structural diagram of the partition of the present invention; Figure 4 This is a cross-sectional view of the internal structure of the mechanical box of the present invention; Figure 5 This is a partial structural diagram of the cleaning frame of the present invention; Figure 6 This is a partial structural diagram of the unidirectional sheet of the present invention; Figure 7 This is a cross-sectional schematic diagram of the internal structure of the hollow cylinder of the present invention; Figure 8 This is a partial structural diagram of the counterweight block of the present invention.

[0021] The components are as follows: 1. Water inlet tank; 2. Air chamber; 3. Air outlet pipe; 4. Check valve assembly; 5. Air header; 6. Buffer pressure stabilizing tank; 7. Generator set; 8. Partition plate; 9. Torsion spring; 10. Connecting rod; 11. Arc plate; 12. Moving mechanism; 121. Mechanical box; 122. Gear; 123. Tooth plate; 124. Moving frame; 13. Cleaning frame; 14. Fixed seat; 15. Magnetic block; 16. Moving rod; 17. Hollow cylinder; 18. Piston; 19. Air supply pipe; 20. One-way plate; 21. Support plate; 22. Corrugated pipe; 23. Counterweight; 24. Helical spring; 25. Limiting rod; 26. Settlement box. Detailed Implementation

[0022] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Please see the appendix Figure 1 -Appendix Figure 6This invention provides a wave energy coupling power generation device for a multi-cavity variable-depth breakwater, comprising a caisson 26, an inlet tank 1 installed inside the caisson 26, an air chamber 2 installed on the upper surface of the inlet tank 1, an outlet pipe 3 installed inside the air chamber 2, a check valve assembly 4 connected to the outer wall of the outlet pipe 3, an air header 5 connected to the inner wall of the check valve assembly 4, the outer wall of the air header 5 penetrating the interior of the caisson 26 and connected to a buffer pressure stabilizing tank 6, a generator set 7 installed at the outlet end of the buffer pressure stabilizing tank 6, multiple partitions 8 installed inside the inlet tank 1, the partitions 8 having openings and through holes, one end of a torsion spring 9 installed inside the inlet tank 1, a connecting rod 10 installed at the other end of the torsion spring 9, both ends of the connecting rod 10 being rotatably connected to the interior of the inlet tank 1, an arc plate 11 installed in the middle of the connecting rod 10, and a moving mechanism 12 installed on the outer wall of the connecting rod 10.

[0024] Specifically, caisson 26 serves as the main body of the breakwater, supporting the internal components and functioning as a port breakwater for wave dissipation and protection, resistance to seawater impact, and fixed installation. Figure 2 It can be concluded that the interior of the inlet tank 1 has a stepped increase, which, together with the setting of the baffle 8, makes the various chambers inside the inlet tank 1 step-shaped, forming a wave modulation channel with a fixed variable water depth. The air chamber 2 can be used at the same height, in conjunction with the inlet tank 1 and the baffle 8. Alternatively, the height of the air chamber 2 can also be stepped according to the step change inside the inlet tank 1. The incident wave generates multiple reflections, interference superpositions, and local resonances in the multi-cavity system, enabling the wave energy to form a graded energy concentration and frequency band expansion effect within the structure. The air chamber 2 is an oscillating water column type, and the oscillation of the free liquid surface inside the chamber drives the air chamber 2 to generate reciprocating airflow. After passing through the check valve group 4, the bidirectional reciprocating airflow is rectified, unifying the inlet or outlet airflow into a unidirectional airflow, improving the airflow stability. The air header 5, as the main converging pipe for the multi-cavity airflow, collects the unidirectional airflow after rectification from all the chambers, realizing energy superposition and release. The large buffer pressure tank 6 buffers air pressure pulsations, stabilizes airflow pressure, and ensures a smooth and continuous airflow into the generator set 7. The generator set 7 is an air turbine and power generation component that receives stable unidirectional airflow and converts air pressure energy into electrical energy to generate wave energy. The connection structure on the outer wall of the partition 8 can be reasonably configured according to its own quantity so that the waves can pass through the stepped chambers and drive each arc plate 11 and its connection structure. As the waves propagate, they drive the moving mechanism 12 through the arc plate 11 so that the subsequent cleaning components can repeatedly scrape and disturb the seaweed, shellfish, biofilm and sediment attached to the edge of the through hole of the partition 8, realize bidirectional automatic unblocking of the through hole of the partition 8, ensure unobstructed communication of multiple chambers, avoid blockage or narrowing of the through hole due to the accumulation of marine attachments, and ensure the seawater flow capacity and pressure transmission stability between each stepped chamber.

[0025] Please see the appendix Figure 3-Appendix Figure 4 The moving mechanism 12 includes a mechanical box 121, the interior of which is disposed on the outer wall of the connecting rod 10. The outer wall of the mechanical box 121 is installed on the inner wall of the water inlet tank 1. A gear 122 is disposed inside the mechanical box 121, and the interior of the gear 122 is installed on the outer wall of the connecting rod 10.

[0026] Specifically, by setting up the mechanical box 121, additional conventional sealing components can be added to ensure the normal transmission of the gear 122 and its connecting components inside the mechanical box 121. The gear 122 and its connecting structure can also be provided with a waterproof coating to ensure the use of the internal components of the mechanical box 121.

[0027] Please see the appendix Figure 4 The tooth ends of gear 122 are meshed with a toothed plate 123. A movable frame 124 is mounted on the upper surface of the toothed plate 123. The outer wall of the movable frame 124 is slidably connected to the inside of the mechanical box 121.

[0028] Specifically, the rotation of gear 122 is converted into the up-and-down movement of gear 123 through the meshing between gear 122 and toothed plate 123, thereby transmitting power to the moving frame 124 and its connecting structure. The movement of the moving frame 124 is offset and limited by the interior of the mechanical box 121.

[0029] Please see the appendix Figure 4 -Appendix Figure 5 A cleaning rack 13 is installed on the outer wall of the movable rack 124. The outer wall of the cleaning rack 13 is set on the outer wall of the partition 8. A fixed seat 14 is slidably connected inside the cleaning rack 13. The outer wall of the fixed seat 14 is installed on the outer wall of the partition 8. A magnetic block 15 is installed on the side of the cleaning rack 13 near the partition 8.

[0030] Specifically, in combination Figure 4 and Figure 5 It is known that cleaning racks 13, fixed seats 14 and magnetic blocks 15 are provided on both sides of the partition 8. The cleaning rack 13 facing the front is driven by the moving frame 124. Through the magnetic attraction between the magnetic blocks 15 on both sides, the cleaning rack 13 on the rear side is moved to facilitate cleaning of both sides of the through hole of the partition 8. The upper and lower movement of the cleaning rack 13 is offset by the outer wall of the fixed seat 14. The outer wall of the cleaning rack 13 can be provided with bristles or brush pads corresponding to the through hole to clean the through hole.

[0031] Please see the appendix Figure 3 -Appendix Figure 6A moving rod 16 is mounted on the upper surface of the moving frame 124. A hollow cylinder 17 is slidably connected to the outer wall of the moving rod 16. The outer wall of the hollow cylinder 17 is mounted on the inner wall of the air chamber 2. A piston 18 is mounted at the top of the moving rod 16. The outer wall of the piston 18 is slidably connected to the inside of the hollow cylinder 17. An air supply pipe 19 is connected to the inside of the hollow cylinder 17. The outer wall of the air supply pipe 19 is connected to the inside of the air outlet pipe 3. A one-way plate 20 is installed inside the air supply pipe 19.

[0032] Specifically, the movement of the moving rod 16 and the piston 18 is offset and limited by the interior of the hollow cylinder 17. Figure 6 It can be seen that the upper side of the gas supply pipe 19 is provided with two pipes, one of which is connected to the interior of the gas outlet pipe 3, and the other is away from the gas outlet pipe 3. One-way vanes 20 are installed inside both pipes, but the orientation and function of the one-way vanes 20 are different. The one-way vane 20 on the side inside the gas outlet pipe 3 is used for exhaust and does not draw back the gas inside the gas outlet pipe 3, while the one-way vane 20 on the side away from the gas outlet pipe 3 is used for absorbing the gas inside the air chamber 2 and does not exhaust it outward, so that the air pressure inside the hollow cylinder 17 is constant and forms a cycle when it changes.

[0033] Please see the appendix Figure 6 The outer wall of the air supply pipe 19 is provided with a support plate 21, the outer wall of the support plate 21 is slidably connected to the inner wall of the air chamber 2, and counterweights 23 are installed around the support plate 21.

[0034] Specifically, the counterweight 23 moves the support plate 21 to a suitable position during small waves, reducing the volume of the air chamber, increasing the air pressure, and improving the power generation capacity of small waves. A gap is left between the support plate 21 and the inner wall of the air chamber 2 to avoid affecting the movement of the support plate 21.

[0035] Please see the appendix Figure 6 -Appendix Figure 8 One end of a bellows 22 is connected to the inside of the support plate 21, and the other end of the bellows 22 is connected to the inside of the air outlet pipe 3; one end of a helical spring 24 is installed on the upper surface of the support plate 21, and the other end of the helical spring 24 is installed on the inner wall of the air chamber 2; a limit rod 25 is installed on the upper surface of the support plate 21, and the outer wall of the limit rod 25 is slidably connected to the inside of the air chamber 2.

[0036] Specifically, the bellows 22 connects the interior of the support plate 21 with the interior of the air outlet pipe 3, allowing the air outlet pipe 3 to absorb pressure changes in the chamber formed between the lower side of the support plate 21 and the air chamber 2. The helical spring 24 acts as an elastic buffer and reset component. During large waves, the support plate 21 moves upward to compress the helical spring 24, expanding its capacity. At the same time, it assists the support plate 21 in automatically resetting. The limit rod 25 restricts the range of movement of the support plate 21.

[0037] Workflow: First, the caisson 26 is set on the wave-facing side along the wave propagation direction as a breakwater. Inside the caisson 26, the water inlet tank 1 and its connecting structure are set. The caisson 26 and the water inlet tank 1 have openings facing the wave propagation direction for seawater flow. The bottom elevation of the water inlet tank 1 changes in sequence, forming several stepped chambers in cooperation with the baffle 8. Each chamber has an air chamber 2 and its connecting structure on the upper side. In the chamber, the free liquid surface oscillates up and down with the waves, squeezing or drawing in the air chamber 2 on the upper side, generating a reciprocating bidirectional airflow. This airflow passes through the air outlet pipe 3 and the check valve group 4 on the upper side, and is rectified into a single-direction airflow that flows into the air header pipe 5. The converged airflow enters the buffer pressure tank 6 to reduce airflow pulsation and stabilize the air pressure. Finally, the directional airflow after pressure stabilization drives the air turbine to rotate, driving the generator set 7 to convert mechanical energy into electrical energy, completing wave energy coupling power generation.

[0038] When the liquid level inside the chamber is above the opening of the partition 8, it surges upwards as the waves propagate, blocked by the partition 8, thereby causing the arc plate 11 and connecting rod 10 to rotate. This deforms the torsion spring 9, which in turn drives the gear 122 to rotate via the connecting rod 10. The gear plate 123 then drives the moving frame 124 to move, causing the cleaning frame 13 to move upwards at the through hole of the partition 8 under the limitation of the fixed seat 14. This cleans the through hole of the partition 8 and prevents it from becoming blocked. The cleaning frame 13, fixed seat 14, and magnetic block 15 are provided on both sides of the partition 8. The magnetic attraction between the magnetic blocks 15 on both sides causes the cleaning frame 13 on both sides to clean the through hole. When the seawater waves recede, the torsion spring 9 causes the connecting rod 10 to reset, thereby resetting the cleaning frame 13 on both sides.

[0039] When the moving frame 124 moves upward, it drives the moving rod 16 and piston 18 to move upward inside the hollow cylinder 17. Since the air pressure inside the hollow cylinder 17 is constant, as the piston 18 moves, it pushes the gas through the gas supply pipe 19 to the inside of the gas outlet pipe 3, thereby additionally pressurizing the gas collected by the check valve assembly 4 through the gas outlet pipe 3. The air chamber 2 is provided with multiple chambers, thereby increasing the overall gas collection pressure of the device for subsequent power generation. When the moving rod 16 and piston 18 move downward with the moving frame 124, the one-way vane 20 inside the gas supply pipe 19 on the side of the gas outlet pipe 3 only discharges and does not draw in air, while the one-way vane 20 inside the gas supply pipe 19 on the side away from the gas outlet pipe 3 only draws in air and does not discharge air, so as to form a cycle of intake and discharge, avoiding the extraction of gas inside the gas pipe 3 when the piston 18 resets.

[0040] When the free liquid surface in the chamber oscillates up and down with the waves, the height of the liquid surface affects the height to which the seawater is lifted, thus affecting the size of the air chamber inside air chamber 2. With the setting of helical spring 24, when the height of the seawater is lifted too high, it squeezes the air in the upper part of the chamber, so that the support plate 21 and the counterweight 23 overcome their own weight and the elastic force of helical spring 24, and the support plate 21 moves up to a suitable distance. The setting of bellows 22 can adapt to the up and down movement of support plate 21, and the interior of support plate 21 and the interior of air outlet pipe 3 remain connected, so as to ensure that the height of the seawater being lifted and the support plate 21 are at a suitable distance, and avoid the air chamber inside air chamber 2 being too small, which would affect the use of air chamber 2.

[0041] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A wave energy coupling power generation device for a multi-cavity variable-depth breakwater, comprising a caisson (26), characterized in that: The caisson (26) is equipped with an inlet tank (1) inside. An air chamber (2) is installed on the upper surface of the inlet tank (1). An air outlet pipe (3) is installed inside the air chamber (2). A check valve assembly (4) is connected to the outer wall of the air outlet pipe (3). An air header pipe (5) is connected to the inside of the check valve assembly (4). The outer wall of the air header pipe (5) penetrates the interior of the caisson (26) and is connected to a buffer pressure stabilizing tank (6). A generator is installed at the air outlet of the buffer pressure stabilizing tank (6). Group (7), the water inlet tank (1) is provided with multiple partitions (8), the partitions (8) are provided with openings and through holes, one end of a torsion spring (9) is installed inside the water inlet tank (1), the other end of the torsion spring (9) is provided with a connecting rod (10), both ends of the connecting rod (10) are rotatably connected to the inside of the water inlet tank (1), an arc plate (11) is installed in the middle of the connecting rod (10), and a moving mechanism (12) is provided on the outer wall of the connecting rod (10).

2. The wave energy coupling power generation device for a multi-cavity variable-depth breakwater according to claim 1, characterized in that: The moving mechanism (12) includes a mechanical box (121), the interior of which is disposed on the outer wall of the connecting rod (10), the outer wall of which is installed on the inner wall of the water inlet tank (1), and a gear (122) is disposed inside the mechanical box (121), the interior of which is installed on the outer wall of the connecting rod (10).

3. The wave energy coupling power generation device for a multi-cavity variable-depth breakwater according to claim 2, characterized in that: The gear (122) has a toothed plate (123) meshing with its toothed end. A movable frame (124) is mounted on the upper surface of the toothed plate (123). The outer wall of the movable frame (124) is slidably connected to the inside of the mechanical box (121).

4. The wave energy coupling power generation device for a multi-cavity variable-depth breakwater according to claim 3, characterized in that: A cleaning rack (13) is installed on the outer wall of the movable frame (124). The outer wall of the cleaning rack (13) is set on the outer wall of the partition (8). A fixed seat (14) is slidably connected inside the cleaning rack (13). The outer wall of the fixed seat (14) is installed on the outer wall of the partition (8). A magnetic block (15) is installed on the side of the cleaning rack (13) near the partition (8).

5. A wave energy coupling power generation device for a multi-cavity variable-depth breakwater according to claim 3, characterized in that: A moving rod (16) is installed on the upper surface of the moving frame (124). A hollow cylinder (17) is slidably connected to the outer wall of the moving rod (16). The outer wall of the hollow cylinder (17) is installed on the inner wall of the air chamber (2). A piston (18) is installed at the top of the moving rod (16). The outer wall of the piston (18) is slidably connected to the inside of the hollow cylinder (17).

6. A wave energy coupling power generation device for a multi-cavity variable-depth breakwater according to claim 5, characterized in that: The hollow cylinder (17) is connected to the inside of a gas supply pipe (19), the outer wall of the gas supply pipe (19) is connected to the inside of the gas outlet pipe (3), and a one-way plate (20) is installed inside the gas supply pipe (19).

7. A wave energy coupling power generation device for a multi-cavity variable-depth breakwater according to claim 6, characterized in that: The outer wall of the gas pipe (19) is provided with a support plate (21), the outer wall of the support plate (21) is slidably connected to the inner wall of the air chamber (2), and counterweights (23) are installed around the support plate (21).

8. A wave energy coupling power generation device for a multi-cavity variable-depth breakwater according to claim 7, characterized in that: The support plate (21) has one end of a corrugated pipe (22) connected to its interior, and the other end of the corrugated pipe (22) is connected to the interior of the air outlet pipe (3).

9. A wave energy coupling power generation device for a multi-cavity variable-depth breakwater according to claim 7, characterized in that: One end of a helical spring (24) is mounted on the upper surface of the support plate (21), and the other end of the helical spring (24) is mounted on the inner wall of the air chamber (2).

10. A wave energy coupling power generation device for a multi-cavity variable-depth breakwater according to claim 7, characterized in that: A limiting rod (25) is installed on the upper surface of the support plate (21), and the outer wall of the limiting rod (25) is slidably connected to the inside of the air chamber (2).

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