Wave energy conversion device

Abstract

The utility model relates to energy conversion technical field discloses a kind of wave energy conversion devices, including buoy;Transmission assembly, it includes at least one set of intermeshing gear and rack, the rack one end is connected with the buoy, the gear is connected with the input end of generator;Adjusting assembly, it includes hydraulic cylinder, piston rod and hydraulic oil circuit, the piston rod one end movably extends into the hydraulic cylinder, and the inner chamber of the hydraulic cylinder is separated into first oil cavity and second oil cavity, the piston rod other end is connected with the rack one end deviating from the buoy, two ends of the hydraulic oil circuit are respectively communicated with the first oil cavity and the second oil cavity, and control valve is equipped on the hydraulic oil circuit, the control valve is used to control the on-off of the hydraulic oil circuit, to switch the communication and the off state of the first oil cavity and the second oil cavity. The utility model has the beneficial effect that damping is adjustable, energy capture efficiency is high and has overload protection capacity.

Description

Technical Field

[0001] This utility model relates to the field of energy conversion technology, and in particular to a wave energy conversion device. Background Technology

[0002] Wave energy is a abundant renewable and clean energy source, and its utilization is usually accomplished through conversion devices to capture, absorb, and convert it. Currently, most traditional wave energy conversion devices use a gear-rack mechanism, which uses a float to drive a rack to move linearly, thereby driving the gear to rotate, converting the kinetic and potential energy of the waves into mechanical energy, which is ultimately output as electrical energy by a generator.

[0003] To address the problem of transmission component damage caused by excessive wave impact, existing technologies add a hydraulic cylinder to the end of the rack. By applying a constant damping or pulling force to the rack's movement, its speed is reduced, thus providing overload protection. This design alleviates the problem of excessive wave impact to some extent, but it cannot adaptively adjust to the magnitude of wave energy. Specifically, the pulling force provided by the hydraulic cylinder is relatively fixed. For high-energy waves, its buffering effect may still be insufficient; while for ordinary waves with lower energy, this constant pulling force is too large, excessively inhibiting the rack's movement. This results in the float capturing small wave energy being unable to overcome the resistance to drive the gears, causing a significant waste of low-grade wave energy. Utility Model Content

[0004] In view of the above-mentioned shortcomings of the existing technology, the technical problem to be solved by this utility model is to provide a wave energy conversion device with adjustable damping, high energy capture efficiency and overload protection capability.

[0005] The technical solution adopted by this utility model to solve its technical problem is to provide a wave energy conversion device, comprising:

[0006] buoy;

[0007] A transmission assembly, comprising at least one set of meshing gears and racks, one end of the rack being connected to the buoy, and the gears being connected to the input end of the generator;

[0008] The adjustment assembly includes a hydraulic cylinder, a piston rod, and a hydraulic circuit. One end of the piston rod extends movably into the hydraulic cylinder, dividing the inner cavity of the hydraulic cylinder into a first oil chamber and a second oil chamber. The other end of the piston rod is connected to the end of the rack away from the buoy. The two ends of the hydraulic circuit are respectively connected to the first oil chamber and the second oil chamber, and a control valve is provided on the hydraulic circuit. The control valve is used to control the on / off state of the hydraulic circuit to switch the connection and disconnection states of the first oil chamber and the second oil chamber.

[0009] In the aforementioned wave energy conversion device, the control valve is a multi-stage opening regulating valve, and the displacement stroke of the control valve core is configured to have a fully open position, a fully closed position, and at least one partially open position.

[0010] In the aforementioned wave energy conversion device, a controller is included, the control valve is communicatively connected to the controller, and at least one first sensor is provided on the buoy, the first sensor being communicatively connected to the controller for detecting the motion parameters of the buoy.

[0011] In the aforementioned wave energy conversion device, at least one second sensor is provided on the piston rod and / or the hydraulic cylinder. The second sensor is communicatively connected to the controller and is used to detect the motion parameters of the piston rod.

[0012] In the aforementioned wave energy conversion device, an adjustment pipe is provided outside the hydraulic cylinder. The two ends of the adjustment pipe are respectively connected to the first oil chamber and the second oil chamber, and the hydraulic oil circuit is formed inside it. The control valve is detachably mounted on the adjustment pipe.

[0013] In the aforementioned wave energy conversion device, an energy storage component is included. The energy storage component includes a first energy storage device and / or a second energy storage device. The first energy storage device is connected to the regulating pipe through a first branch pipe, and the second energy storage device is connected to the regulating pipe through a second branch pipe. The horizontal height of the end of the first branch pipe connected to the regulating pipe is greater than the horizontal height of the end of the second branch pipe connected to the regulating pipe.

[0014] In the aforementioned wave energy conversion device, the rack, gears, and generator are each provided in two sets, arranged at intervals along the horizontal direction. The two sets of gears are respectively connected to the input end of the corresponding generator through connecting shafts, and the two sets of connecting shafts are respectively provided with one-way clutches with opposite locking directions.

[0015] In the aforementioned wave energy conversion device, one end of each of the two sets of racks is connected to the buoy via a horizontally arranged first connecting plate, and the other end is connected to the piston rod via a horizontally arranged second connecting plate. A buffer is provided between the first connecting plate and / or the second connecting plate and the racks.

[0016] In the aforementioned wave energy conversion device, the connecting shaft is connected to the input end of the generator via a coupling, and a flywheel is also provided on the connecting shaft.

[0017] In the aforementioned wave energy conversion device, there are a first housing and a second housing. The first housing has a first accommodating cavity, and the second housing is fixedly disposed in the first accommodating cavity and has a second accommodating cavity. The adjusting component is fixedly disposed in the first accommodating cavity, the gear and the generator are disposed in the second accommodating cavity, the rack is movably disposed on the second housing, and the buoy has a connecting rod movably disposed on the first housing and connected to the rack.

[0018] Compared with the prior art, the present invention has at least the following beneficial effects:

[0019] 1. In this utility model, the adjusting component includes a hydraulic cylinder, a piston rod, and a hydraulic oil circuit. One end of the piston rod is movably inserted into the hydraulic cylinder and divides the inner cavity of the hydraulic cylinder into a first oil chamber and a second oil chamber. The other end of the piston rod is connected to the end of the rack away from the float. The two ends of the hydraulic oil circuit are respectively connected to the first oil chamber and the second oil chamber. A control valve is provided on the hydraulic oil circuit. The control valve is used to control the opening and closing of the hydraulic oil circuit to switch the connection and disconnection states of the first oil chamber and the second oil chamber. This design constitutes a hydraulic damping system with switchable operating modes: when encountering small waves, the two oil chambers can be connected by opening the control valve, allowing the hydraulic oil to flow almost unobstructed, thereby significantly reducing the motion resistance of the piston rod and enabling the float and rack to respond sensitively and efficiently capture the energy of small waves; when encountering large waves, the two oil chambers are blocked by closing the control valve, forcing the hydraulic oil to flow in a restricted channel to generate huge damping, effectively suppressing the excessively fast movement of the rack, absorbing impact energy, and providing reliable overload protection for subsequent transmission components and generators, taking into account both energy conversion efficiency and system safety.

[0020] 2. In this invention, the control valve is a multi-stage opening regulating valve. The displacement stroke of the valve core is configured to have a fully open position, a fully closed position, and at least one partially open position. This design upgrades damping regulation from a simple "on-off" two-state control to continuous or multi-stage refined control. By controlling the valve core to different opening positions, the flow cross-sectional area of ​​the hydraulic oil circuit can be changed in stages or approximately continuously, thereby achieving stepped or stepless adjustment of the damping force. This allows the device to match the optimal damping force for waves of different intensities, maximizing energy capture efficiency over a wider range of sea states, while ensuring smoother and more stable system operation.

[0021] 3. In this invention, the control valve is communicatively connected to the controller, and the buoy is equipped with at least one first sensor, which is also communicatively connected to the controller, for detecting the buoy's motion parameters. This design constructs a closed-loop control system based on real-time sea state perception, enabling the device to automatically determine the opening degree of the control valve according to the actual motion state of the buoy, achieving intelligent adaptive adjustment of the damping force. Compared with traditional solutions that rely on manual intervention or fixed strategies, this significantly improves the responsiveness to complex and random wave environments and enhances the continuity and reliability of power generation output. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of a wave energy conversion device according to the present invention.

[0023] Figure 2 This is a cross-sectional view of a wave energy conversion device according to the present invention.

[0024] Figure 3 This is a schematic diagram of the internal structure of the first and second shells in this utility model.

[0025] In all the accompanying drawings, the same reference numerals denote the same technical features, specifically:

[0026] 100. Buoy; 110. Body; 120. Connecting rod; 200. Transmission assembly; 210. Gear; 220. Rack; 230. Connecting shaft; 231. One-way clutch; 232. Coupling; 240. First connecting plate; 241. Second connecting plate; 242. Buffer; 250. Flywheel; 300. Generator; 400. Adjusting assembly; 410. Hydraulic cylinder; 411. First oil chamber; 412. Second oil chamber; 420. Piston rod; 421. Rod body; 422. Plug section; 430, regulating pipe; 440, control valve; 500, controller; 600, first sensor; 700, second sensor; 710, sensor element; 720, permanent magnet ring; 800, energy storage assembly; 810, first energy storage unit; 811, first branch pipe; 820, second energy storage unit; 821, second branch pipe; 900, first housing; 901, first accommodating cavity; 910, second housing; 911, second accommodating cavity; 912, first support base; 913, second support base. Detailed Implementation

[0027] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0028] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0029] Furthermore, in this utility model, the use of terms such as "first," "second," and "a" is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0030] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0031] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0032] like Figures 1 to 3 As shown, this embodiment provides a wave energy conversion device, comprising:

[0033] Buoy 100;

[0034] The transmission assembly 200 includes at least one set of meshing gears 210 and racks 220, one end of rack 220 is connected to buoy 100, and gears 210 are connected to the input end of generator 300.

[0035] The adjusting assembly 400 includes a hydraulic cylinder 410, a piston rod 420, and a hydraulic oil circuit. One end of the piston rod 420 extends movably into the hydraulic cylinder 410, dividing the inner cavity of the hydraulic cylinder 410 into a first oil chamber 411 and a second oil chamber 412. The other end of the piston rod 420 is connected to the end of the rack 220 away from the float 100. The two ends of the hydraulic oil circuit are respectively connected to the first oil chamber 411 and the second oil chamber 412. A control valve 440 is provided on the hydraulic oil circuit to control the opening and closing of the hydraulic oil circuit, thereby switching the connection and disconnection states of the first oil chamber 411 and the second oil chamber 412. This design constitutes a hydraulic damping system with switchable operating modes: when encountering small waves, the two oil chambers can be connected by opening the control valve 440, allowing the hydraulic oil to flow almost unobstructed, thereby significantly reducing the motion resistance of the piston rod 420 and enabling the float 100 and rack 220 to respond sensitively and efficiently capture small wave energy; when encountering large waves, the two oil chambers are blocked by closing the control valve 440, forcing the hydraulic oil to flow in a restricted channel to generate huge damping, effectively suppressing the excessively fast movement of the rack 220, absorbing impact energy, and providing reliable overload protection for subsequent transmission components and generator 300, taking into account both energy conversion efficiency and system safety.

[0036] like Figures 1 to 3 As shown, the wave energy conversion device provided in this embodiment is mainly used to convert the kinetic and potential energy of ocean waves into electrical energy. The device uses a buoy 100 that moves with the waves to drive a rack 220 in the transmission assembly 200 to perform linear reciprocating motion. The rack 220 further drives the gear 210 meshing with it to rotate, thereby triggering a generator 300 to generate electricity. Simultaneously, an adjustment assembly 400 is used to regulate the damping force during the transmission process to adapt to wave conditions of different intensities. This improves the efficiency of capturing low-energy waves while effectively preventing overload damage to the transmission system caused by high-energy waves.

[0037] In this embodiment, the buoy 100 includes a body 110 and a connecting rod 120. The body 110 has a disc-shaped or block-shaped structure, which has good fluid compliance and stability. The connecting rod 120 is movably mounted on the first housing 900, with one end fixedly connected to the axial center of the body 110 and the other end connected to the rack 220 of the transmission assembly 200, thereby reliably transmitting the up-and-down movement of the buoy 100 to the rack 220.

[0038] To further improve sealing performance and prevent seawater intrusion, a sealing ring is provided between the connecting rod 120 and the guide hole of the first housing 900.

[0039] Furthermore, the buoy 100 body 110 is equipped with at least one first sensor 600, which is communicatively connected to the controller 500. This first sensor 600 is used to detect the motion parameters of the buoy 100 and transmit the acquired data to the controller 500 as the basis for automatically adjusting the opening state of the control valve 440. These motion parameters include, but are not limited to, swing amplitude and acceleration, and can comprehensively reflect the dynamic behavior of the buoy 100.

[0040] Preferably, multiple first sensors 600 are provided and arranged at equal intervals along the periphery of the body 110. This design helps to eliminate measurement blind spots caused by the limitation of the installation position or orientation of a single sensor, thereby improving the sensing accuracy of the more than 100 degrees of freedom motion state of the buoy and providing more reliable data support for the control strategy.

[0041] Preferably, the first sensor 600 is one or more combinations of an accelerometer, an angle sensor, or an attitude sensor.

[0042] To provide effective protection for the transmission assembly 200 and the adjustment assembly 400, this embodiment also includes a first housing 900 and a second housing 910, which together form a nested sealed protective structure. The first housing 900 has a first accommodating cavity 901 extending along its length to accommodate the second housing 910 and the adjustment assembly 400. The second housing 910 is horizontally fixed within the first accommodating cavity 901 and has a second accommodating cavity 911 arranged along its length to accommodate and protect the transmission assembly 200 and the generator 300. This design achieves functional zoning and environmental isolation, effectively preventing corrosion of key mechanical and electrical components by seawater, salt spray, and marine organisms. It also enhances the overall structural rigidity and impact resistance, facilitating long-term stable operation of the device in complex marine environments.

[0043] Furthermore, the second accommodating cavity 911 is provided with two sets of first support seats 912 and two sets of second support seats 913 for reliable positioning and support of the generator 300 and transmission components. The two sets of first support seats 912 are horizontally fixed to the inner walls at both ends of the second accommodating cavity 911, and each first support seat 912 has a hollow cylindrical structure. Its inner hole is adapted to the housing or mounting flange of the generator 300 to support and fix the generator 300, ensuring its stable position during operation and maintaining coaxiality with the connecting shaft 230. The two sets of second support seats 913 are vertically fixed in the middle region of the second accommodating cavity 911, located at corresponding positions of the two sets of gears 210. A bearing is provided at the top of the second support seat 913, which forms a rotatable engagement with the connecting shaft 230 of the through gear 210, providing radial support for the connecting shaft 230. This design allows the connecting shaft 230 to be effectively supported on both sides of the gear 210, thereby significantly improving the stress state of the connecting shaft 230 and avoiding bending deformation or uneven loading of the gear 210 due to unilateral cantilever.

[0044] Furthermore, the transmission assembly 200 includes at least one set of meshing gears 210 and racks 220. The rack 220 is arranged vertically, with its upper end connected to the connecting rod 120 of the buoy 100 and its lower end connected to the piston rod 420 in the adjustment assembly 400. The gears 210 are connected to the input end of the generator 300 to convert the linear reciprocating motion of the rack 220 into rotational motion, thereby driving the generator 300 to generate electricity.

[0045] Furthermore, both the gear 210 and the generator 300 are housed within the second accommodating cavity 911. The generator 300 is detachably mounted on the first support 912 within the second accommodating cavity 911, facilitating future maintenance, replacement, or upgrades. The rack 220 is movably mounted on the second housing 910, enabling free reciprocating motion in the vertical direction.

[0046] Furthermore, the rack 220, gear 210, and generator 300 are each provided in two sets, arranged at intervals along the horizontal direction. The two sets of gears 210 are connected to the input ends of the two sets of generators 300 via connecting shafts 230, and each of the two connecting shafts 230 is equipped with a one-way clutch 231 with opposite locking directions. This design allows one set of one-way clutches 231 to lock and drive the corresponding generator 300 to rotate when the rack 220 moves upward, while the other set idles; when the rack 220 moves downward, the state switches, and the previously idle set begins to lock and generate electricity. Thus, regardless of whether the buoy 100 is in its ascending or descending stroke, at least one set of generators 300 can be driven to rotate unidirectionally, achieving full-cycle wave energy capture and significantly improving power generation efficiency.

[0047] Furthermore, one end of each of the two sets of racks 220 is fixedly connected to the connecting rod 120 of the buoy 100 via a horizontally arranged first connecting plate 240, and the other end is fixedly connected to the piston rod 420 via a horizontally arranged second connecting plate 241. This design synchronizes the multiple racks 220 in the vertical direction, ensuring their coordinated movement under wave excitation and avoiding skewing or jamming caused by uneven force, while also facilitating overall assembly and positioning.

[0048] Furthermore, a buffer 242 is provided between the first connecting plate 240 and / or the second connecting plate 241 and the rack 220. This buffer 242 can be a rubber pad, a helical spring, or an elastic polymer element, used to absorb instantaneous loads caused by wave impacts, compensate for manufacturing or assembly errors between the multiple racks 220, and reduce additional stress caused by asynchronous movement. This design effectively improves the smoothness of operation and structural durability of the transmission assembly 200.

[0049] Furthermore, the connecting shaft 230 is connected to the input end of the generator 300 via a coupling 232 to compensate for minor misalignment between shafts and reduce vibration transmission. Simultaneously, a flywheel 250 is also provided on the connecting shaft 230. This flywheel 250 absorbs and stores rotational kinetic energy, suppressing severe vibrations of the system during high waves; and continuously releases the stored kinetic energy during low waves to compensate for insufficient energy input and maintain stable operation of the generator 300.

[0050] Preferably, the coupling 232 is a universal coupling 232 or a cross coupling 232 to accommodate shaft offset under actual installation conditions and ensure the reliability of power transmission.

[0051] Furthermore, one end of the connecting shaft 230 is connected to the input end of the generator 300 via a coupling 232, and the other end is rotatably connected to the second support base 913 via a gear 210.

[0052] In order to achieve overload protection of the transmission component 200 and efficient wave energy collection, in this embodiment, an adjustment component 400 is provided at the bottom of the first accommodating cavity 901.

[0053] Furthermore, the adjustment assembly 400 includes a hydraulic cylinder 410, a piston rod 420, and a hydraulic oil circuit. The hydraulic cylinder 410 is vertically fixed at the bottom of the first accommodating cavity 901, with its axis parallel to the direction of movement of the rack 220. The piston rod 420 includes a rod body 421 and a piston portion 422 integrally connected or fixedly assembled. One end of the rod body 421 with the piston portion 422 movably extends into the hydraulic cylinder 410, dividing the inner cavity of the hydraulic cylinder 410 into a first oil chamber 411 above the piston portion 422 and a second oil chamber 412 below the piston portion 422. The other end of the rod body 421 is fixedly connected to the end of the rack 220 away from the buoy 100 via a second connecting plate 241, thereby directly transmitting the vertical reciprocating motion of the rack 220 to the piston rod 420, driving the piston portion 422 to reciprocate synchronously within the hydraulic cylinder 410, and thus applying a controllable hydraulic damping force during the movement of the rack 220.

[0054] The two ends of the hydraulic circuit are connected to the first oil chamber 411 and the second oil chamber 412, respectively. A control valve 440 is provided on the hydraulic circuit to control the opening and closing of the hydraulic circuit, thereby switching the connection and disconnection states of the first oil chamber 411 and the second oil chamber 412. Specifically, when the control valve 440 is open, the two oil chambers are connected, and the hydraulic oil can flow freely between them. The system exhibits low damping characteristics, which is beneficial for sensitive response under small wave conditions. When the control valve 440 is closed, the two oil chambers are isolated, and the movement of the piston rod 420 is limited by the compression resistance of the closed oil. The system exhibits high damping characteristics, effectively suppressing overspeed movement under large wave impacts and achieving overload protection for the transmission component 200.

[0055] Furthermore, the control valve 440 is a multi-stage opening regulating valve. The displacement stroke of the valve core of the control valve 440 is configured to have a fully open position, a fully closed position, and at least one partially open position. This design upgrades damping regulation from a simple "on-off" two-state control to continuous or multi-stage fine control. By controlling the valve core of 440 at different opening positions, the flow cross-sectional area of ​​the hydraulic oil circuit can be changed in stages or approximately continuously, thereby achieving stepped or stepless adjustment of the damping force. This allows the device to match the optimal damping force for waves of different intensities, maximizing energy capture efficiency over a wider range of sea states, while ensuring smoother and more stable system operation.

[0056] Preferably, the control valve 440 is a proportional valve or a servo valve.

[0057] To achieve intelligent control of the control valve 440, in this embodiment, the device further includes a controller 500, with the control valve 440 and the first sensor 600 respectively communicatively connected to the controller 500. The controller 500, based on the received sensor data and in conjunction with a preset control strategy or adaptive algorithm, makes real-time decisions and outputs control signals to adjust the opening state of the control valve 440, thereby dynamically adjusting the hydraulic damping characteristics. This design constructs a closed-loop control system based on real-time sea state perception, enabling the device to automatically determine the opening degree of the control valve 440 according to the actual motion state of the buoy 100, achieving intelligent adaptive adjustment of the damping force. Compared to traditional solutions relying on manual intervention or fixed strategies, this significantly improves the responsiveness to complex, random wave environments and enhances the continuity and reliability of power generation output.

[0058] Furthermore, the controller 500 is fixedly mounted at the bottom of the first accommodating cavity 901 and is arranged adjacent to the hydraulic cylinder 410. This design helps to shorten the signal or pipeline connection path between the controller 500 and the control valve 440, reduce transmission delay and interference, and facilitate centralized protection and maintenance of the regulating component 400.

[0059] Furthermore, at least one second sensor 700 is provided on the piston rod 420 and / or the hydraulic cylinder 410. This second sensor 700 is communicatively connected to the controller 500 and is used to detect the motion parameters (such as speed and force) of the piston rod 420. This design allows the controller 500 to more accurately perceive the actual operating conditions of the hydraulic damping system, thereby achieving more precise control of the control valve 440, optimizing the dynamic performance of the system, and potentially enabling load-based preventive protection.

[0060] Furthermore, the second sensor 700 is one or more combinations of a magnetostrictive displacement sensor, a velocity sensor, an acceleration sensor, or a pressure sensor. Preferably, it is a magnetostrictive displacement sensor, whose structure includes a sensing element 710 (electronic head) and a permanent magnet ring 720. The sensing element 710 is fixedly mounted on the end of the hydraulic cylinder 410 or on the cylinder body; the permanent magnet ring 720 is fixedly mounted on the piston rod 420 and moves synchronously with the piston rod 420, maintaining a non-contact engagement with the electronic head. This design offers advantages such as non-contact measurement, high resolution, long lifespan, and resistance to oil contamination and vibration, making it particularly suitable for harsh operating conditions inside hydraulic systems.

[0061] Furthermore, the hydraulic circuit can be located inside or outside the hydraulic cylinder 410. When the hydraulic circuit is located inside the hydraulic cylinder 410, it can be integrated into the piston section 422 to form a connecting oil circuit arranged axially along the piston section 422; when the hydraulic circuit is located outside the hydraulic cylinder 410, the first oil chamber 411 and the second oil chamber 412 are connected through an external pipe.

[0062] Preferably, the hydraulic cylinder 410 is externally equipped with an adjusting pipe 430, the two ends of which are connected to the first oil chamber 411 and the second oil chamber 412 respectively, forming a hydraulic oil circuit inside. The control valve 440 is detachably mounted on the adjusting pipe 430. This design not only has a simple structure and is easy to manufacture, but also significantly improves the maintainability of the system. When the control valve 440 needs maintenance, replacement, or upgrade, it is not necessary to disassemble the hydraulic cylinder body or drain all the hydraulic oil; only the control valve 440 on the adjusting pipe 430 needs to be operated, greatly reducing maintenance costs and downtime. At the same time, the external layout facilitates heat dissipation and monitoring of the control valve 440, further ensuring its long-term stable operation in marine environments.

[0063] Furthermore, the device also includes an energy storage assembly 800, which includes a first accumulator 810 and / or a second accumulator 820 located at the bottom of the first accommodating cavity 901. The first accumulator 810 is connected to the regulating pipe 430 via a first branch pipe 811, and the second accumulator 820 is connected to the regulating pipe 430 via a second branch pipe 821. The horizontal height of the end of the first branch pipe 811 connected to the regulating pipe 430 is greater than the horizontal height of the end of the second branch pipe 821 connected to the regulating pipe 430. This staggered connection arrangement allows the two accumulators to respond to different pressure conditions during system operation: when the piston rod 420 descends rapidly and the pressure in the second oil chamber 412 rises sharply, the second accumulator 820, located at the lower position, preferentially absorbs the high-pressure oil and buffers the impact; when the piston rod 420 ascends and the pressure in the first oil chamber 411 increases, the first accumulator 810, located at the higher position, more easily participates in pressure compensation. By arranging the first accumulator 810 and the second accumulator 820 at interfaces at different heights, and combining the gravity effect and pressure distribution characteristics of hydraulic oil, differentiated energy recovery and release of asymmetric loads during bidirectional motion can be achieved, thereby improving the system's dynamic response capability and energy utilization efficiency.

Claims

1. A wave energy conversion device, characterized in that, include: buoy; A transmission assembly, comprising at least one set of meshing gears and racks, one end of the rack being connected to the buoy, and the gears being connected to the input end of the generator; The adjustment assembly includes a hydraulic cylinder, a piston rod, and a hydraulic circuit. One end of the piston rod extends movably into the hydraulic cylinder, dividing the inner cavity of the hydraulic cylinder into a first oil chamber and a second oil chamber. The other end of the piston rod is connected to the end of the rack away from the buoy. The two ends of the hydraulic circuit are respectively connected to the first oil chamber and the second oil chamber, and a control valve is provided on the hydraulic circuit. The control valve is used to control the on / off state of the hydraulic circuit to switch the connection and disconnection states of the first oil chamber and the second oil chamber.

2. The wave energy conversion device according to claim 1, characterized in that, The control valve is a multi-stage opening regulating valve, and the displacement stroke of the control valve core is configured to have a fully open position, a fully closed position, and at least one partially open position.

3. The wave energy conversion device according to claim 1, characterized in that, The device includes a controller, a control valve that is communicatively connected to the controller, and at least one first sensor that is communicatively connected to the controller for detecting the motion parameters of the buoy.

4. A wave energy conversion device according to claim 3, characterized in that, At least one second sensor is provided on the piston rod and / or the hydraulic cylinder. The second sensor is communicatively connected to the controller and is used to detect the motion parameters of the piston rod.

5. A wave energy conversion device according to claim 1, characterized in that, The hydraulic cylinder is provided with an adjustment pipe, the two ends of which are connected to the first oil chamber and the second oil chamber respectively, forming the hydraulic oil circuit inside, and the control valve is detachably mounted on the adjustment pipe.

6. A wave energy conversion device according to claim 5, characterized in that, The device includes an energy storage assembly, which includes a first energy storage device and / or a second energy storage device. The first energy storage device is connected to the regulating pipe through a first branch pipe, and the second energy storage device is connected to the regulating pipe through a second branch pipe. The horizontal height of the end of the first branch pipe connected to the regulating pipe is greater than the horizontal height of the end of the second branch pipe connected to the regulating pipe.

7. A wave energy conversion device according to claim 1, characterized in that, The rack, gear, and generator are each provided in two sets, and are arranged at intervals along the horizontal direction. The two sets of gears are respectively connected to the input end of the corresponding generator through connecting shafts, and the two sets of connecting shafts are respectively provided with one-way clutches with opposite locking directions.

8. A wave energy conversion device according to claim 7, characterized in that, One end of each of the two sets of racks is connected to the buoy via a horizontally arranged first connecting plate, and the other end is connected to the piston rod via a horizontally arranged second connecting plate. A buffer is provided between the first connecting plate and / or the second connecting plate and the rack.

9. A wave energy conversion device according to claim 7, characterized in that, The connecting shaft is connected to the input end of the generator via a coupling, and a flywheel is also provided on the connecting shaft.

10. A wave energy conversion device according to claim 1, characterized in that, The device includes a first housing and a second housing. The first housing has a first receiving cavity, and the second housing is fixedly disposed within the first receiving cavity and has a second receiving cavity. The adjusting assembly is fixedly disposed within the first receiving cavity, the gear and the generator are disposed within the second receiving cavity, the rack is movably disposed on the second housing, and the buoy has a connecting rod movably disposed on the first housing and connected to the rack.

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