Water hydraulic wave energy power generation system and device

Abstract

The invention discloses a water hydraulic wave energy power generation system which comprises an energy capture module, a rectification module, an energy conversion and stabilization module and a self-locking module. The energy capture module comprises a first hydraulic cylinder and a second hydraulic cylinder which are symmetrically arranged and mechanically connected to a floater; a hydraulic medium filled in the first hydraulic cylinder and the second hydraulic cylinder is fresh water; the energy conversion and stabilization module comprises a high-pressure main oil way, a high-pressure energy accumulator, a two-way variable displacement motor, a low-pressure oil return way and a low-pressure energy accumulator. Through the synergistic effect of the first hydraulic cylinder and the second hydraulic cylinder which are symmetrically arranged and mechanically connected with the floater and the rectification module, self-compensation and smooth adjustment of the output flow are achieved, and it is ensured that the energy transfer direction is constant. The energy conversion efficiency of the generator is improved, and the quality of output electric energy is improved. Fresh water is adopted as a hydraulic medium, the pollution risk of hydraulic medium leakage to the marine ecological environment is eliminated from the source, and the environmental protection requirement under the marine environment is met.

Description

Technical Field

[0001] This invention relates to the field of wave energy power generation technology, and in particular to a water-hydraulic wave energy power generation system and device. Background Technology

[0002] Wave energy is a abundant and renewable blue energy source, and its development and utilization are of great significance for optimizing the energy structure. Among the many wave energy conversion technologies, hydraulic transmission is widely considered a promising technology due to its ability to efficiently convert slow reciprocating motion into high-speed rotational motion, and its ease of power aggregation and pressure stabilization. However, traditional hydraulic wave energy systems have the following problems in practical applications: 1. Because it uses hydraulic oil as a medium, it poses an extremely high risk of leakage under long-term, harsh marine conditions. Once leaked, it will cause continuous pollution to the marine ecosystem. 2. In order to achieve bidirectional motion capture, traditional wave energy power generation systems usually use a single bidirectional hydraulic cylinder to drive the float. However, due to the difference in the effective area of ​​the rod chamber and the rodless chamber of the hydraulic cylinder, the hydraulic oil flow and pressure are uneven during the float's lifting and lowering stroke, causing drastic fluctuations in generator speed and torque, affecting power generation efficiency and power quality, and threatening grid security. 3. The reciprocating motion of the float causes the oil output direction to change in multiple directions. Traditional systems need to rely on complex valve groups or large-capacity accumulators to achieve unidirectional rotation of the hydraulic motor, which increases system complexity, cost, energy loss and failure points. 4. Under extreme sea conditions such as typhoons, wave impact energy can easily cause hydraulic components to be damaged by overpressure. However, traditional protection schemes mostly focus on disconnecting the electrical system and lack a simple, reliable and self-locking protection mechanism that cuts off energy at the mechanical / hydraulic input end.

[0003] Therefore, there is an urgent need for a hydraulic transmission system that can fundamentally solve problems such as environmental pollution, poor output stability, system complexity, and weak survivability. Summary of the Invention

[0004] The purpose of this invention is to provide a hydro-hydraulic wave energy power generation system and device to solve one or more technical problems existing in the background art.

[0005] To achieve this objective, the present invention adopts the following technical solution: A water-hydraulic wave energy power generation system, comprising: The energy harvesting module includes a first hydraulic cylinder and a second hydraulic cylinder symmetrically arranged and mechanically connected to the float, wherein the hydraulic medium filled in the first hydraulic cylinder and the second hydraulic cylinder is fresh water; A rectifier module is connected to the oil ports of the first hydraulic cylinder and the second hydraulic cylinder, and is used to rectify the bidirectional unstable fluid flow output by the first hydraulic cylinder and the second hydraulic cylinder under the action of waves into a unidirectional fluid flow with a constant direction. The energy conversion and stabilization module includes a high-pressure main oil circuit, a high-pressure accumulator, a bidirectional variable motor, a low-pressure return oil circuit, and a low-pressure accumulator. The input ends of the high-pressure main oil circuit and the low-pressure return oil circuit are both connected to the rectifier module. The high-pressure accumulator is connected in parallel to the high-pressure main oil circuit. The output end of the high-pressure main oil circuit is connected to the first oil port of the bidirectional variable motor. The second oil port of the bidirectional variable motor is connected to the return oil end of the low-pressure return oil circuit. The return oil end of the low-pressure return oil circuit is connected to the rectifier module. The shaft of the bidirectional variable motor is rigidly connected to the input shaft of the generator. The self-locking module is used to control the opening and closing of the oil circuit between the rectifier module and the energy conversion and stabilization module, and to control the opening and closing of each oil port of the first hydraulic cylinder and the second hydraulic cylinder, so as to achieve rigid locking of the float.

[0006] Preferably, it also includes an active oil replenishment module, which includes a first check valve, a hydraulic pump, and an oil tank. The input end of the hydraulic pump is connected to the oil tank, the output end of the hydraulic pump is connected to the input end of the first check valve, and the output end of the first check valve is connected to the rectifier module.

[0007] Preferably, the high-pressure main oil circuit includes a second check valve, a first pressure reducing valve, and a third check valve. The input end of the second check valve is connected to the rectifier module, the output end of the second check valve is connected to the high-pressure accumulator and the input end of the first pressure reducing valve, the output end of the first pressure reducing valve is connected to the input end of the third check valve, and the output end of the third check valve is connected to the first oil port of the bidirectional variable motor.

[0008] Preferably, the low-pressure return oil circuit includes a second pressure reducing valve, a fourth check valve, a first reversing valve, a throttle valve, and a fifth check valve. The input end of the second pressure reducing valve is connected to the rectifier module, and the output end of the second pressure reducing valve is connected to the input end of the fourth check valve. The output end of the fourth check valve is connected to the low-pressure accumulator and the input end of the first reversing valve. The output end of the first reversing valve is connected to the input end of the throttle valve. The input end of the fifth check valve is connected to the second oil port of the bidirectional variable motor, and the output end of the throttle valve is connected to the output end of the fifth check valve and the rectifier module.

[0009] Preferably, the self-locking module includes a second reversing valve and a third reversing valve. The input end of the second reversing valve is connected to the rectifier module, the output end of the second reversing valve is connected to the input end of the high-pressure main oil circuit and the input end of the low-pressure return oil circuit, the input end of the third reversing valve is connected to the output end of the high-pressure main oil circuit, and the output end of the third reversing valve is connected to the first oil port of the bidirectional variable motor.

[0010] Preferably, the self-locking module further includes a first electrically controlled check valve, a second electrically controlled check valve, a third electrically controlled check valve, and a fourth electrically controlled check valve. The output end of the first electrically controlled check valve is connected to the rod chamber of the first hydraulic cylinder, the input end of the second electrically controlled check valve is connected to the rodless chamber of the first hydraulic cylinder, the input end of the third electrically controlled check valve is connected to the rod chamber of the second hydraulic cylinder, and the output end of the fourth electrically controlled check valve is connected to the rodless chamber of the second hydraulic cylinder.

[0011] Preferably, the active oil replenishment module further includes a first overflow valve and a second overflow valve. The input end of the first overflow valve is connected to the input end of the high-pressure main oil circuit and the input end of the low-pressure return oil circuit, and the output end of the first overflow valve is connected to the oil tank. The input end of the second overflow valve is connected to the return end of the low-pressure return oil circuit, and the output end of the second overflow valve is connected to the oil tank.

[0012] Preferably, the rectifier module includes a sixth check valve, a first rectifier check valve, a second rectifier check valve, a third rectifier check valve, a fourth rectifier check valve, a fifth rectifier check valve, a sixth rectifier check valve, a seventh rectifier check valve, and an eighth rectifier check valve; the input ends of the first rectifier check valve, the second rectifier check valve, the fifth rectifier check valve, and the sixth rectifier check valve are all connected to the return end of the low-pressure return oil circuit; the output end of the first rectifier check valve is connected to the rod chamber of the first hydraulic cylinder and the input end of the third rectifier check valve; the output end of the second rectifier check valve is connected to the first... The rodless chamber of the hydraulic cylinder is connected to the input end of the fourth rectifier check valve. The output end of the third rectifier check valve is connected to the rod chamber of the second hydraulic cylinder and the input end of the seventh rectifier check valve. The output end of the fourth rectifier check valve is connected to the rodless chamber of the second hydraulic cylinder and the input end of the eighth rectifier check valve. The output ends of the third, fourth, seventh, and eighth rectifier check valves are all connected to the input end of the sixth check valve. The output end of the sixth check valve is connected to the input end of the high-pressure main oil circuit and the input end of the low-pressure return oil circuit.

[0013] The beneficial effects of this invention are as follows: Through the symmetrical arrangement and mechanical connection of the first and second hydraulic cylinders with the float, and the synergistic effect of the rectifier module, this invention achieves self-compensation and smooth adjustment of the output flow. The rectifier module also ensures a constant energy transfer direction. This effectively solves the problem of severe output power pulsation caused by the inherent structural defects of a single hydraulic cylinder in existing technologies, while also improving the energy conversion efficiency of the generator and enhancing the quality of the output power, making it easier to connect to the grid or utilize directly.

[0014] This invention uses fresh water as the hydraulic medium, eliminating the risk of pollution to the marine ecological environment from the source of hydraulic medium leakage and meeting the environmental protection requirements of the marine environment.

[0015] This invention features a self-locking module that controls the opening and closing of the oil circuit between the rectifier module and the energy conversion and stabilization module, as well as the opening and closing of each oil port of the hydraulic cylinder, under severe conditions such as typhoons. This enables the float to be locked quickly, physically cutting off the input path of destructive energy, effectively protecting the core hydraulic and power generation components, reducing maintenance costs and risks, and giving the wave energy device higher reliability and service life in the marine environment.

[0016] The wave energy generation system of this invention has a simple structure, fewer potential failure points, and is easier to maintain. Furthermore, although it requires initial investment in dedicated freshwater hydraulic components, in the long run, it avoids the continuous costs of purchasing, replacing, and handling leaks of hydraulic oil, resulting in greater economic advantages throughout its entire lifecycle. Attached Figure Description

[0017] The accompanying drawings further illustrate the present invention, but the content of the drawings does not constitute any limitation on the present invention.

[0018] Figure 1 This is a schematic diagram of the structure of one embodiment of the present invention; Figure 2 This is a schematic diagram of one embodiment of the present invention.

[0019] Among them: fourth electrically controlled check valve 1, third electrically controlled check valve 2, second hydraulic cylinder 3, first hydraulic cylinder 4, first electrically controlled check valve 5, second electrically controlled check valve 6, first rectifier check valve 7, second rectifier check valve 8, third rectifier check valve 9, fourth rectifier check valve 10, sixth check valve 11, first relief valve 12, second directional valve 13, second pressure reducing valve 14, second check valve 15, first pressure reducing valve 16, third directional valve 1 7. Third check valve 18. Bidirectional variable motor 19. Generator 20. High-voltage accumulator 21. Low-voltage accumulator 22. Fourth check valve 23. First directional valve 24. Fifth check valve 25. Throttle valve 26. Second relief valve 27. Oil tank 28. Seventh rectifier check valve 29. Eighth rectifier check valve 30. Hydraulic pump 31. Electric motor 32. Sixth rectifier check valve 33. Fifth rectifier check valve 34. First check valve 35. Detailed Implementation

[0020] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0021] This embodiment describes a water-hydraulic wave energy power generation system, as shown in the attached diagram. Figure 1 and 2 ,include: The energy harvesting module includes a first hydraulic cylinder 4 and a second hydraulic cylinder 3 symmetrically arranged and mechanically connected to the float. The hydraulic medium filled in the first hydraulic cylinder 4 and the second hydraulic cylinder 3 is fresh water. The rectifier module is connected to the oil ports of the first hydraulic cylinder 4 and the second hydraulic cylinder 3. It is used to rectify the bidirectional unstable fluid flow output by the first hydraulic cylinder 4 and the second hydraulic cylinder 3 under the action of waves into a unidirectional fluid flow with a constant direction. The energy conversion and stabilization module includes a high-pressure main oil circuit, a high-pressure accumulator 21, a bidirectional variable motor 19, a low-pressure return oil circuit, and a low-pressure accumulator 22. The input ends of the high-pressure main oil circuit and the low-pressure return oil circuit are both connected to the rectifier module. The high-pressure accumulator 21 is connected in parallel to the high-pressure main oil circuit. The output end of the high-pressure main oil circuit is connected to the first oil port of the bidirectional variable motor 19. The second oil port of the bidirectional variable motor 19 is connected to the return oil end of the low-pressure return oil circuit. The return oil end of the low-pressure return oil circuit is connected to the rectifier module. The rotating shaft of the bidirectional variable motor 19 is rigidly connected to the input shaft of the generator 20. The self-locking module is used to control the opening and closing of the oil circuit between the rectifier module and the energy conversion and stabilization module, and to control the opening and closing of each oil port of the first hydraulic cylinder 4 and the second hydraulic cylinder 3, so as to achieve rigid locking of the float.

[0022] The energy capture module in this embodiment uses two symmetrically distributed bidirectional hydraulic cylinders to jointly drive the float. Utilizing the natural complementarity of the rod-side and rodless-side outputs of the two cylinders, the inherent flow and pressure fluctuations caused by the area difference of a single cylinder are smoothed out, providing a stable and balanced hydraulic energy input for subsequent power generation, thus improving power generation quality and efficiency. The hydraulic cylinders use fresh water as the hydraulic medium, fundamentally eliminating the pollution to the ocean caused by traditional hydraulic oil leaks.

[0023] By setting up a rectifier module, the bidirectional unstable fluid flow output by the first hydraulic cylinder 4 and the second hydraulic cylinder 3 under the action of waves is rectified into a unidirectional fluid flow with a constant direction, ensuring that the hydraulic motor and generator can rotate continuously, unidirectionally and smoothly, and realizing the efficient and high-quality conversion from wave reciprocating motion to electrical energy.

[0024] High-pressure accumulator 21 and low-pressure accumulator 22 are connected in parallel to the high-pressure main oil circuit and low-pressure return oil circuit of the bidirectional variable motor 19, respectively. This enables the stabilization of hydraulic pressure and the buffering and storage of energy, smoothing fluctuations in fluid pressure and flow, and providing a stable high-pressure fluid flow into the bidirectional variable motor 19, ensuring its stable operation. Furthermore, the rigid connection between the bidirectional variable motor 19's shaft and the generator 20's input shaft efficiently converts hydraulic energy into electrical energy, further improving energy conversion efficiency. By setting up the high-pressure accumulator 21, when the wave motion is violent and the hydraulic cylinder's inlet oil pressure drops instantaneously, the fresh water stored in the accumulator, under the pressure difference, provides instantaneous, high-flow-rate active oil replenishment to the oil circuit that is about to run dry, effectively preventing air from entering.

[0025] By controlling the on / off of the oil circuit between the rectifier module and the energy conversion and stabilization module, as well as the on / off of each oil port of the dual hydraulic cylinders, the float can be rigidly locked. In extreme sea conditions such as typhoons, the energy transmission path can be cut off from the mechanical / hydraulic input end to avoid damage to hydraulic components caused by wave impact energy.

[0026] Preferably, it also includes an active oil replenishment module, which includes a first check valve 35, a hydraulic pump 31 and an oil tank 28. The input end of the hydraulic pump 31 is connected to the oil tank 28, the output end of the hydraulic pump 31 is connected to the input end of the first check valve 35, and the output end of the first check valve 35 is connected to the rectifier module.

[0027] The hydraulic pump 31 is driven by the electric motor 32 to draw fresh water from the oil tank 28 and actively replenishes oil to the rectifier module through the first check valve 35. It can replenish the medium loss caused by leakage in the hydraulic circuit due to sealing gaps and component wear in real time, and maintain the basic pressure on the low-pressure side, complementing the instantaneous oil replenishment of the accumulator group.

[0028] Preferably, the high-pressure main oil circuit includes a second check valve 15, a first pressure reducing valve 16, and a third check valve 18. The input end of the second check valve 15 is connected to the rectifier module, the output end of the second check valve 15 is connected to the high-pressure accumulator 21 and the input end of the first pressure reducing valve 16, the output end of the first pressure reducing valve 16 is connected to the input end of the third check valve 18, and the output end of the third check valve 18 is connected to the first oil port of the bidirectional variable motor 19.

[0029] By setting a second check valve 15 and a third check valve 18, the medium in the high-pressure main oil circuit is prevented from flowing back to the rectifier module, thus avoiding interference from the high pressure of the main oil circuit on the bidirectional liquid flow rectification function of the rectifier module. This ensures that all the unidirectional liquid flow output by the rectifier module can be input into the high-pressure main oil circuit, improving energy transfer efficiency. By setting a first pressure reducing valve 16, the pressure of the high-pressure main oil circuit can be adjusted to a suitable working pressure range according to the actual operating conditions of the bidirectional variable motor 19. This avoids the problem of motor overpressure operation due to excessively high oil circuit pressure or insufficient motor output torque due to excessively low pressure, ensuring that the bidirectional variable motor 19 is always in a high-efficiency operating state and maintaining the stability of the generator 20 speed and output power quality. By setting a high-pressure accumulator 21, when the output liquid flow pressure of the rectifier module increases instantaneously, the high-pressure accumulator 21 can quickly absorb excess hydraulic energy, preventing a sudden increase in oil circuit pressure; when the liquid flow pressure decreases, the accumulator releases the stored hydraulic energy to replenish the oil circuit pressure.

[0030] Preferably, the low-pressure return oil circuit includes a second pressure reducing valve 14, a fourth check valve 23, a first reversing valve 24, a throttle valve 26, and a fifth check valve 25. The input end of the second pressure reducing valve 14 is connected to the rectifier module, and the output end of the second pressure reducing valve 14 is connected to the input end of the fourth check valve 23. The output end of the fourth check valve 23 is connected to the low-pressure accumulator 22 and the input end of the first reversing valve 24. The output end of the first reversing valve 24 is connected to the input end of the throttle valve 26. The input end of the fifth check valve 25 is connected to the second oil port of the bidirectional variable motor 19, and the output end of the throttle valve 26 is connected to the output end of the fifth check valve 25 and the rectifier module.

[0031] By setting the second pressure reducing valve 14, the fluid pressure input to the rectifier module can be adjusted to the appropriate pressure of the low-pressure return oil circuit, preventing fluctuations in the fluid pressure output from the rectifier module from being directly transmitted to the low-pressure side, thus preventing damage to components such as the low-pressure accumulator 22 and the check valve due to pressure overload. Simultaneously, the stable low-pressure environment provides stable back pressure support for the return oil side of the bidirectional variable motor 19, improving the torque output stability of the motor during operation and reducing speed fluctuations caused by return oil pressure fluctuations. A fourth check valve 23 is used to prevent the energy storage medium in the low-pressure accumulator 22 from flowing back to the pressure reducing valve. A fifth check valve 25 is used to prevent the fluid flow from the low-pressure return oil circuit from flowing back into the second oil port of the bidirectional variable motor 19, preventing problems such as reverse rotation and sudden speed changes in the bidirectional variable motor 19 due to reverse fluid flow impact, thus ensuring the stability of motor operation. A first directional valve 24 is used to control the on / off state between the low-pressure return oil circuit and the second oil port of the rectifier module and the bidirectional variable motor 19. During system start-up, shutdown, maintenance, or self-locking in extreme sea conditions, the return oil passage can be cut off, achieving dual safety locking of the oil circuit in conjunction with the self-locking module. A throttle valve 26 is used to adjust the return oil flow according to the output power requirements of the generator 20 to match the energy input of the high-pressure main oil circuit, further optimizing the system's energy conversion efficiency. A low-pressure accumulator 22 is used to store excess hydraulic energy in the low-pressure return oil circuit in real time. When the low-pressure fluid flow output by the rectifier module is insufficient, the low-pressure accumulator 22 releases the stored energy to supplement the return oil flow, ensuring the continuity of fluid flow on the return side of the bidirectional variable motor 19, reducing motor idling and energy loss caused by insufficient return oil, and improving the overall energy utilization rate of the system.

[0032] Preferably, the self-locking module includes a second directional valve 13 and a third directional valve 17. The input end of the second directional valve 13 is connected to the rectifier module, and the output end of the second directional valve 13 is connected to the input end of the high-pressure main oil circuit and the input end of the low-pressure return oil circuit. The input end of the third directional valve 17 is connected to the output end of the high-pressure main oil circuit, and the output end of the third directional valve 17 is connected to the first oil port of the bidirectional variable motor 19.

[0033] By setting a second reversing valve 13, the connection status between the rectifier module and the high and low pressure oil circuits is controlled. During normal operation, the second reversing valve 13 is in the conducting state, and the rectified unidirectional liquid flow can enter the high pressure main oil circuit and the low pressure return oil circuit. When encountering extreme sea conditions such as typhoons, by controlling the second reversing valve 13 and the third reversing valve 17 to be in the open state, the oil circuit from the rectifier module to the energy conversion module and the oil circuit between the high pressure main oil circuit and the bidirectional variable motor 19 are directly cut off, thereby blocking the transmission of hydraulic energy generated by wave impact and preventing the residual pressure of the accumulator from impacting the motor.

[0034] Furthermore, the self-locking module also includes a first electrically controlled check valve 5, a second electrically controlled check valve 6, a third electrically controlled check valve 2, and a fourth electrically controlled check valve 1. The output end of the first electrically controlled check valve 5 is connected to the rod chamber of the first hydraulic cylinder 4, the input end of the second electrically controlled check valve 6 is connected to the rodless chamber of the first hydraulic cylinder 4, the input end of the third electrically controlled check valve 2 is connected to the rod chamber of the second hydraulic cylinder 3, and the output end of the fourth electrically controlled check valve 1 is connected to the rodless chamber of the second hydraulic cylinder 3. By setting up the first electrically controlled check valve 5, the second electrically controlled check valve 6, the third electrically controlled check valve 2, and the fourth electrically controlled check valve 1, under normal operation, these valves are in a bidirectional flow state, and the first hydraulic cylinder 4 and the second hydraulic cylinder 3 can complete the suction and discharge actions with the reciprocating rise and fall of the float. When encountering extreme sea conditions such as typhoons, the first electrically controlled check valve 5, the second electrically controlled check valve 6, the third electrically controlled check valve 2, and the fourth electrically controlled check valve 1 are switched to a unidirectional flow state. This allows the hydraulic lock composed of the four sets of electrically controlled check valves to use the unidirectional conduction characteristics of the electrically controlled check valves and the supporting force of the closed medium in the hydraulic cylinders to rigidly lock the piston rods of the first hydraulic cylinder 4 and the second hydraulic cylinder 3 at the highest position of the float, achieving a jack-like self-holding locking state, which improves the reliability and durability in harsh marine environments.

[0035] Preferably, the active oil replenishment module further includes a first overflow valve 12 and a second overflow valve 27. The input end of the first overflow valve 12 is connected to the input end of the high-pressure main oil circuit and the input end of the low-pressure return oil circuit, and the output end of the first overflow valve 12 is connected to the oil tank 28. The input end of the second overflow valve 27 is connected to the return end of the low-pressure return oil circuit, and the output end of the second overflow valve 27 is connected to the oil tank 28. By setting the first overflow valve 12 and the second overflow valve 27, overpressure protection is provided for the high-pressure main oil circuit and the low-pressure return oil circuit.

[0036] Preferably, the rectifier module includes a sixth check valve 11, a first rectifier check valve 7, a second rectifier check valve 8, a third rectifier check valve 9, a fourth rectifier check valve 10, a fifth rectifier check valve 34, a sixth rectifier check valve 33, a seventh rectifier check valve 29, and an eighth rectifier check valve 30; the input ends of the first rectifier check valve 7, the second rectifier check valve 8, the fifth rectifier check valve 34, and the sixth rectifier check valve 33 are all connected to the return end of the low-pressure return oil circuit; the output end of the first rectifier check valve 7 is connected to the rod chamber of the first hydraulic cylinder 4 and the input end of the third rectifier check valve 9; the output end of the second rectifier check valve 8... The first hydraulic cylinder 4 is connected to the rodless chamber and the input end of the fourth rectifier check valve 10. The output end of the third rectifier check valve 9 is connected to the rod chamber of the second hydraulic cylinder 3 and the input end of the seventh rectifier check valve 29. The output end of the fourth rectifier check valve 10 is connected to the rodless chamber of the second hydraulic cylinder 3 and the input end of the eighth rectifier check valve 30. The output ends of the third rectifier check valve 9, the fourth rectifier check valve 10, the seventh rectifier check valve 29, and the eighth rectifier check valve 30 are all connected to the input end of the sixth check valve 11. The output end of the sixth check valve 11 is connected to the input end of the high-pressure main oil circuit and the input end of the low-pressure return oil circuit.

[0037] The hydraulic bridge circuit, consisting of eight check valves—the first rectifier check valve 7, the second rectifier check valve 8, the third rectifier check valve 9, the fourth rectifier check valve 10, the fifth rectifier check valve 34, the sixth rectifier check valve 33, the seventh rectifier check valve 29, and the eighth rectifier check valve 30—is connected to the corresponding passages of the rod-side and rodless-side chambers of the first hydraulic cylinder 4 and the second hydraulic cylinder 3, respectively. This circuit can adapt to the bidirectional unstable fluid flow during the float's ascent and descent. Regardless of whether the float is in the upward or downward stroke, the suction and discharge actions of any chamber of the hydraulic cylinder can be guided and rectified into a unidirectional fluid flow through the conduction / cut-off characteristics of the rectifier check valves in the hydraulic bridge circuit. This ensures that the fluid flow direction output to the high-pressure main oil circuit and the low-pressure return oil circuit is constant, solving the problem of reverse fluid flow fluctuation and ensuring that the fluid flow direction to the high-pressure and low-pressure oil circuits is constant, thus enabling the bidirectional variable motor 19 to rotate stably in one direction.

[0038] The technical principles of the present invention have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of the invention and should not be construed as limiting the scope of protection of the invention in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of the invention without inventive effort, and these embodiments will all fall within the scope of protection of the present invention.

Claims

1. A water-hydraulic wave energy power generation system, characterized in that, include: The energy harvesting module includes a first hydraulic cylinder and a second hydraulic cylinder symmetrically arranged and mechanically connected to the float, wherein the hydraulic medium filled in the first hydraulic cylinder and the second hydraulic cylinder is fresh water; A rectifier module is connected to the oil ports of the first hydraulic cylinder and the second hydraulic cylinder, and is used to rectify the bidirectional unstable fluid flow output by the first hydraulic cylinder and the second hydraulic cylinder under the action of waves into a unidirectional fluid flow with a constant direction. The energy conversion and stabilization module includes a high-pressure main oil circuit, a high-pressure accumulator, a bidirectional variable motor, a low-pressure return oil circuit, and a low-pressure accumulator. The input ends of the high-pressure main oil circuit and the low-pressure return oil circuit are both connected to the rectifier module. The high-pressure accumulator is connected in parallel to the high-pressure main oil circuit. The output end of the high-pressure main oil circuit is connected to the first oil port of the bidirectional variable motor. The second oil port of the bidirectional variable motor is connected to the return oil end of the low-pressure return oil circuit. The return oil end of the low-pressure return oil circuit is connected to the rectifier module. The shaft of the bidirectional variable motor is rigidly connected to the input shaft of the generator. The self-locking module is used to control the opening and closing of the oil circuit between the rectifier module and the energy conversion and stabilization module, and to control the opening and closing of each oil port of the first hydraulic cylinder and the second hydraulic cylinder, so as to achieve rigid locking of the float.

2. The water-hydraulic wave energy power generation system according to claim 1, characterized in that, It also includes an active oil replenishment module, which includes a first check valve, a hydraulic pump, and an oil tank. The input end of the hydraulic pump is connected to the oil tank, the output end of the hydraulic pump is connected to the input end of the first check valve, and the output end of the first check valve is connected to the rectifier module.

3. The water-hydraulic wave energy power generation system according to claim 1, characterized in that, The high-pressure main oil circuit includes a second check valve, a first pressure reducing valve, and a third check valve. The input end of the second check valve is connected to the rectifier module, the output end of the second check valve is connected to the high-pressure accumulator and the input end of the first pressure reducing valve, the output end of the first pressure reducing valve is connected to the input end of the third check valve, and the output end of the third check valve is connected to the first oil port of the bidirectional variable motor.

4. A water-hydraulic wave energy power generation system according to claim 1, characterized in that, The low-pressure return oil circuit includes a second pressure reducing valve, a fourth check valve, a first reversing valve, a throttle valve, and a fifth check valve. The input end of the second pressure reducing valve is connected to the rectifier module, and the output end of the second pressure reducing valve is connected to the input end of the fourth check valve. The output end of the fourth check valve is connected to the low-pressure accumulator and the input end of the first reversing valve. The output end of the first reversing valve is connected to the input end of the throttle valve. The input end of the fifth check valve is connected to the second oil port of the bidirectional variable motor, and the output end of the throttle valve is connected to the output end of the fifth check valve and the rectifier module.

5. A water-hydraulic wave energy power generation system according to claim 1, characterized in that, The self-locking module includes a second reversing valve and a third reversing valve. The input end of the second reversing valve is connected to the rectifier module, and the output end of the second reversing valve is connected to the input end of the high-pressure main oil circuit and the input end of the low-pressure return oil circuit. The input end of the third reversing valve is connected to the output end of the high-pressure main oil circuit, and the output end of the third reversing valve is connected to the first oil port of the bidirectional variable motor.

6. A water-hydraulic wave energy power generation system according to claim 5, characterized in that, The self-locking module further includes a first electrically controlled check valve, a second electrically controlled check valve, a third electrically controlled check valve, and a fourth electrically controlled check valve. The output end of the first electrically controlled check valve is connected to the rod chamber of the first hydraulic cylinder, the input end of the second electrically controlled check valve is connected to the rodless chamber of the first hydraulic cylinder, the input end of the third electrically controlled check valve is connected to the rod chamber of the second hydraulic cylinder, and the output end of the fourth electrically controlled check valve is connected to the rodless chamber of the second hydraulic cylinder.

7. A water-hydraulic wave energy power generation system according to claim 2, characterized in that, The active oil replenishment module also includes a first overflow valve and a second overflow valve. The input end of the first overflow valve is connected to the input end of the high-pressure main oil circuit and the input end of the low-pressure return oil circuit, and the output end of the first overflow valve is connected to the oil tank. The input end of the second overflow valve is connected to the return end of the low-pressure return oil circuit, and the output end of the second overflow valve is connected to the oil tank.

8. A water-hydraulic wave energy power generation system according to claim 1, characterized in that, The rectification module includes a sixth check valve, a first rectification check valve, a second rectification check valve, a third rectification check valve, a fourth rectification check valve, a fifth rectification check valve, a sixth rectification check valve, a seventh rectification check valve, and an eighth rectification check valve. The input ends of the first, second, fifth, and sixth rectification check valves are all connected to the return end of the low-pressure return oil circuit. The output end of the first rectification check valve is connected to the rod chamber of the first hydraulic cylinder and the input end of the third rectification check valve. The output end of the second rectification check valve is connected to the first hydraulic cylinder's... The rodless chamber of the cylinder is connected to the input end of the fourth rectifier check valve. The output end of the third rectifier check valve is connected to the rod chamber of the second hydraulic cylinder and the input end of the seventh rectifier check valve. The output end of the fourth rectifier check valve is connected to the rodless chamber of the second hydraulic cylinder and the input end of the eighth rectifier check valve. The output ends of the third, fourth, seventh, and eighth rectifier check valves are all connected to the input end of the sixth check valve. The output end of the sixth check valve is connected to the input end of the high-pressure main oil circuit and the input end of the low-pressure return oil circuit.

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