A wave energy hydraulic energy conversion system with anti-continuous oil leakage function

Abstract

To automatically cut off the oil intake circuit of the wave energy device's hydraulic energy conversion system in the event of a leak or rupture in the hydraulic cylinder hose, thereby reducing hydraulic oil pollution to the ocean, this invention discloses a wave energy hydraulic energy conversion system with a continuous oil leakage prevention function. The system comprises a power cylinder, a standard check valve, an oil intake pipe, a pressure tank, a two-position two-way valve, a hydraulically controlled check valve, an oil discharge pipe, a cartridge valve, and an accumulator. This wave energy hydraulic energy conversion system can autonomously determine whether a leak has occurred in the hydraulic hose of the hydraulic cylinder based on the pressure within the hydraulic lines, and automatically cut off the oil intake circuit of the hydraulic cylinder, thereby disconnecting the hydraulic cylinder from the hydraulic system, reducing hydraulic oil leakage, and ensuring the safety of the hydraulic energy conversion system.

Description

Technical Field

[0001] This invention relates to a hydraulic energy conversion and control system for wave energy power generation devices, specifically to a wave energy hydraulic energy conversion system with a function to prevent continuous oil leakage. Background Technology

[0002] Ocean wave energy, as a clean and renewable energy source, has received attention from many coastal countries, and more and more countries are increasing their research and development of wave energy technology. The main way to utilize wave energy is for power generation. Generally, wave energy power generation devices can be divided into energy harvesting systems and energy conversion systems, among which the most commonly used energy conversion system is the hydraulic conversion method.

[0003] The working principle of a conventional hydraulic energy conversion system is as follows: Driven by waves, the wave-absorbing float drives the hydraulic cylinder installed with it to reciprocate. During the reciprocating motion, the hydraulic cylinder draws hydraulic oil from the oil tank and then outputs it to the high-pressure accumulator group. After the hydraulic oil is stored in the accumulator, it reaches the set pressure and releases the high-pressure hydraulic oil to drive the hydraulic motor and generator set to generate electricity.

[0004] The process of hydraulic cylinder drawing in and outputting hydraulic oil is achieved through a pair of check valves. Since the hydraulic cylinder follows the movement of the wave absorber or base when drawing in and discharging oil, especially some wave energy devices that use the pitching mode of the float to do work, the hydraulic cylinder will also have a certain swing angle. Therefore, the oil pipe connecting the two check valves on the hydraulic cylinder must be a rubber hose with a certain range of motion.

[0005] Due to the force of waves, the hydraulic cylinder will continuously reciprocate. In this constant motion, the hydraulic hoses connected to the one-way valve on the cylinder become the weakest link in the entire wave energy conversion system. This includes the suction hose from the oil tank and the high-pressure hose leading to the accumulator, both of which are prone to loosening or bursting, leading to hydraulic oil leakage. Even after leakage, because the hydraulic cylinder is still driven by waves, it will continue to draw oil from the tank and supply it to the high-pressure hose, gradually draining all the hydraulic oil from the tank and causing significant pollution to the sea surface. Furthermore, if the hydraulic cylinder is installed underwater, the leaked hydraulic oil will introduce a large amount of seawater into the system, potentially damaging other components. Therefore, how to automatically cut off the oil intake circuit in the event of a hydraulic cylinder hose leak or burst, reducing marine pollution and ensuring the wave energy conversion system remains undamaged, is a pressing issue in wave energy power generation technology. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide a wave energy hydraulic energy conversion system with the function of preventing continuous oil leakage. This wave energy hydraulic energy conversion system can autonomously determine whether the hydraulic hose on the hydraulic cylinder is leaking by the pressure in the hydraulic pipeline, and automatically cut off the oil inlet of the hydraulic cylinder, thereby disconnecting the hydraulic cylinder from the hydraulic system, reducing the amount of hydraulic oil leakage and ensuring the safety of the hydraulic energy conversion system.

[0007] To achieve the above objectives, the technical solution of the present invention is as follows:

[0008] A wave energy hydraulic energy conversion system with continuous oil leakage prevention function includes a power cylinder, a common check valve, an oil suction pipe, a pressure tank, a two-position two-way valve, a hydraulically controlled check valve, an oil discharge pipe, a cartridge valve, and an accumulator.

[0009] The two-position two-way valve includes three ports: a pilot port, an inlet, and an outlet.

[0010] The cartridge valve includes three ports, distributed as an inlet end, an outlet end, and a rear end;

[0011] The pressure oil tank is equipped with an oil suction port;

[0012] The hydraulic actuator includes an actuator cylinder barrel and an actuator cylinder piston rod. The actuator cylinder piston rod is installed inside the actuator cylinder barrel to divide the actuator cylinder barrel into a rodless chamber and a rod chamber.

[0013] The power cylinder includes a cylinder barrel and a piston rod installed inside the cylinder barrel. The area where the piston rod is located inside the cylinder barrel is the rod chamber. The rod chamber is connected to one end of a conventional check valve and a hydraulically controlled check valve, respectively.

[0014] The other end of the ordinary one-way valve is connected to one end of the oil suction pipe. The other end of the oil suction pipe is divided into two paths: one path is connected to one end of the control ball valve, and the other path is connected to the pilot oil port of the two-position two-way valve.

[0015] The other end of the control ball valve is connected to the oil inlet of the pressure oil tank; the control ball valve is driven to open and close by the hydraulic actuator.

[0016] The other end of the hydraulic check valve is connected to one end of the drain pipe. The other end of the drain pipe is divided into two paths: one path connects to the inlet of the cartridge valve, and the other path connects to the rodless chamber of the actuator cylinder. The control port of the hydraulic check valve is connected to the outlet of the two-position two-way valve. When there is no pressure oil signal at the control port of the hydraulic check valve, the hydraulic check valve can only be opened in one direction. When there is a pressure oil signal at the control port of the hydraulic check valve, the hydraulic check valve can be opened in both directions.

[0017] The outlet of the cartridge valve is divided into four branches: the main branch is connected to the accumulator, the second branch is connected to the rear end of the cartridge valve, the third branch is connected to the rod chamber of the actuator cylinder, and the fourth branch is connected to the inlet of the two-position two-way valve.

[0018] Optionally, the hydraulic actuator further includes a rack and a gear, the rack being connected to the piston rod of the actuator cylinder, the gear meshing with the rack, and the gear being connected to the handle of the control ball valve via a shaft to drive the opening and closing of the control ball valve.

[0019] Optionally, when the actuator cylinder piston rod moves to the right, it pushes the rack to move to the right, and the gear meshing with it rotates counterclockwise. When the actuator cylinder moves to the left, it pulls the rack to move to the left in sync, and the gear meshing with it rotates clockwise. During the rotation of the gear, it drives the control ball valve handle to rotate, thereby driving the opening and closing of the control ball valve.

[0020] Optionally, the pressure tank is provided with a return port, which is connected to the outlet of the hydraulic motor.

[0021] Optionally, the air pressure above the liquid level in the pressure tank is between 0.3 and 0.5 MPa.

[0022] Optionally, the outlet of the accumulator is connected to a control valve group and a hydraulic motor. When the accumulator pressure reaches a set value, the control valve group is automatically opened / closed, driving the hydraulic motor to rotate and driving the generator to generate electricity. During the motor rotation, the hydraulic oil returns to the pressure tank through the motor outlet.

[0023] Optionally, the oil suction pipe is an oil suction hose, and the oil discharge pipe is an oil discharge hose.

[0024] Optionally, during normal operation, the power hydraulic cylinder reciprocates under wave drive. When the piston rod of the power hydraulic cylinder moves upward, the hydraulic oil in the rod chamber of the hydraulic cylinder is compressed into high pressure and enters the inlet of the cartridge valve through the hydraulic control check valve and the drain pipe. The drain pipe also has another branch leading to the connection port of the rodless chamber of the actuator cylinder. After the high-pressure hydraulic oil enters the cartridge valve, it flows out through the outlet of the cartridge valve in four branches. The main branch enters the accumulator for energy storage and pressure stabilization. The second branch enters the rear end of the cartridge valve, so that the oil in the cartridge valve will not flow back from the outlet to the inlet. The third branch connects to the connection port of the rod chamber of the actuator cylinder, the piston rod of the actuator cylinder is in the fully extended state, and the control ball valve is in the open state. The fourth branch leads to the inlet of the two-position two-way valve. The inlet and outlet of the two-position two-way valve are not connected. There is no pressure signal input to the control port of the hydraulic control check valve. The hydraulic control check valve can only be opened from left to right.

[0025] When the working hydraulic cylinder moves downward, the rod chamber of the working hydraulic cylinder will draw oil from the pressure oil tank through a common check valve, a suction hose, and a control ball valve.

[0026] Driven by the continuous wave action, the hydraulic cylinder continuously performs normal oil intake and discharge operations.

[0027] Optionally, when the drain pipe ruptures, the piston rod of the hydraulic actuator cylinder will move to the left and be in a retracted state. During the retraction process, the rack will drive the gear to rotate, thereby pushing the control ball valve handle to rotate, causing the control ball valve to close and cutting off the oil supply to the working hydraulic cylinder.

[0028] Optionally, when the suction hose ruptures, the piston rod of the hydraulic actuator cylinder will move to the left and enter a retracted state. During this retraction, the rack will drive the gear to rotate, which in turn pushes the control ball valve handle to rotate, causing the control ball valve to close and cutting off the oil supply to the working hydraulic cylinder.

[0029] Compared with the prior art, the advantages of this invention are as follows:

[0030] This embodiment provides a wave energy hydraulic energy conversion system with a function to prevent continuous oil leakage. Compared with traditional wave energy hydraulic energy conversion systems, it can quickly cut off the oil suction line when the oil suction hose and oil discharge hose are broken, so that the hydraulic oil of the system will not leak continuously, thus preventing environmental pollution and economic losses. Attached Figure Description

[0031] Figure 1 A schematic diagram of the wave energy hydraulic energy conversion system with anti-continuous oil leakage function provided in this application embodiment.

[0032] Figure 2 Schematic diagram of hydraulic actuator components

[0033] Figure 3 State diagram of the oil drain hose rupture system

[0034] Figure 4 State diagram of the oil suction hose rupture system

[0035] Figure 5 Hydraulic actuator status diagram when the control ball valve is opened

[0036] Figure 6 Hydraulic actuator status diagram when the ball valve is closed.

[0037] Explanation of reference numerals in the attached diagram: 1-Power cylinder; 2-Standard check valve; 3-Suction hose; 4-Two-position two-way valve; 5-Control ball valve; 6-Hydraulic actuator; 7-Pressure tank; 8-Hydraulic check valve; 9-Drain hose; 10-Cartridge valve; 11-Accumulator; 6.1-Actuator cylinder barrel; 6.2-Actuator cylinder piston rod; 6.3-Gear; 6.4-Rack. Detailed Implementation

[0038] Example:

[0039] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0040] In the description of this application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0041] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0042] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can be a mechanical connection or an electrical connection; they can be a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0043] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact, or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0044] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0045] See Figure 1 and Figure 2 As shown, the wave energy hydraulic energy conversion system with continuous oil leakage prevention function provided in this embodiment mainly consists of a working cylinder 1, a common one-way valve 2, an oil suction hose 3, a two-position two-way valve 4, a control ball valve 5, a hydraulic actuator 6, a pressure tank 7, a hydraulically controlled one-way valve 8, an oil discharge hose 9, a cartridge valve 10, and an accumulator 11. The common one-way valve 2 is a conventional one-way valve that can only conduct in one direction.

[0046] The two-position two-way valve has three ports: pilot port G, inlet A, and outlet B; the cartridge valve has three ports: inlet C, outlet D, and rear end H.

[0047] The hydraulic actuator 6 includes an actuator cylinder barrel 6.1 and an actuator cylinder piston rod 6.2. The actuator cylinder piston rod 6.2 is installed inside the actuator cylinder barrel 6.1 to divide the actuator cylinder barrel 6.1 into a rodless chamber and a rod chamber.

[0048] The working hydraulic cylinder 1 includes a cylinder barrel and a piston rod installed inside the cylinder barrel. The area where the piston rod is located inside the cylinder barrel is the rod chamber. The piston rod is used to connect to the wave-absorbing float, and the cylinder barrel end is used to connect to the base. The rod chamber is connected to one end of a common check valve 2 and a hydraulically controlled check valve 8. When the piston rod of the working hydraulic cylinder 1 moves upward, the hydraulic oil of the working hydraulic cylinder 1 is discharged from the hydraulically controlled check valve 8. When the working hydraulic cylinder 1 moves downward, the rod chamber of the working hydraulic cylinder 1 draws oil through the common check valve 2.

[0049] The other end of the ordinary one-way valve 2 is connected to one end of the oil suction pipe 3. The other end of the oil suction pipe 3 is divided into two paths: one path is connected to one end of the control ball valve 5, and the other path is connected to the pilot oil port G of the two-position two-way valve 4. The other end of the control ball valve 5 is connected to the oil suction port of the pressure oil tank 7. The control ball valve 5 is driven to open and close by the hydraulic actuator 6.

[0050] The other end of the hydraulic check valve 8 is connected to one end of the drain pipe 9. The other end of the drain pipe 9 is divided into two paths: one path is connected to the inlet end C of the cartridge valve 10, and the other path is connected to the connection port E of the rodless chamber of the actuator cylinder. The control port of the hydraulic check valve 8 is connected to the outlet B of the two-position two-way valve. When there is no pressure oil signal at the control port of the hydraulic check valve 8, the hydraulic check valve 8 can only be unidirectionally opened, from left to right, but not from right to left. When there is a pressure oil signal at the control port of the hydraulic check valve 8, the hydraulic check valve can be bidirectionally opened.

[0051] The outlet D of the cartridge valve 10 is divided into four branches. The main branch is connected to the accumulator 11 for energy storage and pressure stabilization. The second branch is connected to the rear end H of the cartridge valve 10. The third branch is connected to the connection port F of the rod chamber of the actuator cylinder. The fourth branch is connected to the inlet A of the two-position two-way valve 4.

[0052] In one specific embodiment, the hydraulic actuator 6 further includes a gear 6.3 and a rack 6.4. The rack 6.4 is connected to the end of the actuator cylinder piston rod 6.2, and the gear 6.3 and rack 6.4 mesh with each other. The gear 6.3 is connected to the handle of the control ball valve 5 via a shaft to drive the operation of the control ball valve 5. When the actuator cylinder piston rod 6.2 moves to the right, it pushes the rack 6.4 to move to the right, and the gear 6.3 meshing with it rotates counterclockwise. When the actuator cylinder piston rod 6.2 moves to the left, it pulls the rack 6.4 to move synchronously to the left, and the gear 6.3 meshing with it rotates clockwise. During the rotation of the gear 6.3, the handle of the control ball valve 5 is driven to rotate, thereby driving the opening and closing of the control ball valve 5. In this way, the opening and closing of the control ball valve 5 can be achieved by using the hydraulic actuator 6.

[0053] In one specific embodiment, the pressure oil tank 7 is also provided with a return oil port, which is connected to the outlet of the hydraulic motor, and the air pressure above the liquid level in the pressure oil tank is between 0.3 and 0.5 MPa.

[0054] The outlet of the accumulator 11 is connected to the control valve group and the hydraulic motor. When the pressure of the accumulator 11 reaches the set value, the control valve group is automatically opened / closed, driving the hydraulic motor to rotate and driving the generator to generate electricity. During the rotation of the motor, the hydraulic oil returns to the pressure oil tank 7 through the motor outlet.

[0055] See Figure 1 As shown, during normal operation of this system, the working hydraulic cylinder 1 reciprocates under wave drive. When the piston rod of the working hydraulic cylinder 1 moves upward, the hydraulic oil in the rod chamber of the hydraulic cylinder is compressed into high pressure and enters the inlet C of the cartridge valve through the hydraulic control check valve 2 and the drain hose 9. The drain hose 9 also has another branch leading to the connection port E of the rodless chamber of the actuator cylinder, thus entering the rodless chamber of the hydraulic actuator cylinder. After the high-pressure hydraulic oil enters the cartridge valve 10, it is divided into four branches through the outlet D of the cartridge valve 10. The oil flows out, with the main branch entering the accumulator 11 for energy storage and pressure stabilization. The second branch enters the rear end H of the cartridge valve 10, preventing the oil from flowing back from the outlet D to the inlet C. The third branch connects to the connection port F of the rod chamber of the actuator cylinder. Since the pressure oil in both the rodless and rod chambers of the actuator cylinder comes from the right end of the working hydraulic cylinder 1, the pressure is basically the same. However, because the cross-sectional area of ​​the rodless chamber of the actuator cylinder is larger than that of the rod chamber, the piston rod 6.2 of the actuator cylinder is in a fully extended state. Figure 5As shown, at this time, the control ball valve 5 is in the open state; the fourth branch leads to the inlet A of the two-position two-way valve. Since the pilot port G connects to the pressure tank 7 via the control ball valve 5, and the pressure tank has a pressure of 0.3-0.5 MPa, there is a pressure oil signal input. The valve core remains in the left position, and inlet A and outlet B are not connected. Therefore, there is no pressure signal input to the control port of the hydraulic check valve 8, and the hydraulic check valve 8 can only be opened from left to right. When the working hydraulic cylinder 1 moves downward, the rod chamber of the working hydraulic cylinder 1 will draw oil from the pressure tank 7 through the ordinary check valve 2, the suction hose 3, and the control ball valve 5. Under the continuous drive of the wave, the working hydraulic cylinder 1 continuously performs normal oil suction and discharge actions.

[0056] When the oil drain hose 9 breaks, such as Figure 3 As shown, the right end of the hydraulic check valve 8 is open, and pressure cannot be established. Therefore, the pressure in the rodless chamber of the actuator cylinder disappears. However, since the inlet C and outlet D of the cartridge valve 10 are also unidirectional, the pressure in the original high-pressure pipeline after the outlet D of the cartridge valve 10 cannot be transmitted to the inlet C through the outlet D. Therefore, the pipeline pressure after the outlet D of the cartridge valve 10 remains, and the pressure at the connection port F of the third branch at the outlet D connected to the rod chamber of the actuator cylinder is maintained. Since the rod chamber of the actuator cylinder is high pressure and the rodless chamber is low pressure, the piston rod of the hydraulic actuator cylinder will move to the left and be in a retracted state. Figure 6 As shown, during the contraction process, the rack 6.4 drives the gear 6.3 to rotate, which in turn pushes the control ball valve 5 handle to rotate, causing the control ball valve 5 to close and cutting off the oil supply to the working hydraulic cylinder. This prevents hydraulic oil from being continuously drawn into the pressure tank 7 through the working cylinder and then flowing out from the damaged drain hose 9, thus avoiding continuous leakage of hydraulic oil from the drain hose.

[0057] When the oil suction hose 3 breaks, such as Figure 4As shown, the left end of the ordinary one-way valve 2 is in an open state, and pressure cannot be established. Therefore, the pressure signal from the pressure tank 7 cannot be transmitted to the pilot port G of the two-position two-way valve 4. Under the action of the spring, the valve core of the two-position two-way valve 4 moves to the right, and the inlet A and outlet B of the two-position two-way valve 4 are connected. The pipeline pressure after the outlet D of the cartridge valve 10 is always present. The pressure oil of the fourth branch after the outlet D will enter the control port of the hydraulic control one-way valve 8 through the two-position two-way valve 4. After the control port has a pressure oil signal, the hydraulic control one-way valve 8 is bidirectionally connected. The pipeline from the right end of the hydraulic control one-way valve 8 to the inlet C of the cartridge valve 10 has the same pressure as the rod chamber of the power hydraulic cylinder. Due to the rupture of the suction hose 3, there is no continuous hydraulic oil input to the rod chamber of the power hydraulic cylinder 1, resulting in the power hydraulic cylinder... When the cylinder is in an unloaded state, the rod chamber of the working hydraulic cylinder 1 will be in an oil-free, low-pressure state. Therefore, the pipeline from the right end of the hydraulic check valve 8 to the inlet C of the cartridge valve 10 will also be in a low-pressure state. The rodless chamber of the actuator cylinder connected to this pipeline will also be in a low-pressure state. However, since the inlet C and outlet D of the cartridge valve 10 are also unidirectional, the pressure in the original high-pressure pipeline after the outlet D of the cartridge valve cannot be transmitted to the inlet C through the outlet D. Therefore, the pressure in the pipeline after the outlet D of the cartridge valve remains, and the pressure at the connection port F of the third branch of the outlet D connected to the rod chamber of the actuator cylinder is maintained. Since the rod chamber is high pressure and the rodless chamber is low pressure, the piston rod of the hydraulic actuator cylinder will move to the left and be in a retracted state. Figure 6 As shown, during the contraction process, the rack 6.4 drives the gear 6.3 to rotate, which in turn pushes the handle of the control ball valve 5 to rotate, causing the control ball valve 5 to close and cutting off the oil supply to the power hydraulic cylinder, so that the hydraulic oil can continue to flow out through the suction pipe without damage.

[0058] In summary, the wave energy hydraulic energy conversion system with anti-continuous oil leakage function provided in this embodiment, compared with the traditional wave energy hydraulic energy conversion system, can quickly cut off the oil suction line when the oil suction hose and oil discharge hose are broken, so that the hydraulic oil of the system will not continue to leak, thus preventing environmental pollution and economic losses.

[0059] The above embodiments are merely illustrative of the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made based on the essence of the content of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A wave energy hydraulic energy conversion system with anti-continuous oil leakage function, characterized in that, Includes power cylinder, ordinary check valve, suction pipe, pressure tank, two-position two-way valve, hydraulic check valve, drain pipe, cartridge valve and accumulator; The two-position two-way valve includes three ports: a pilot port, an inlet, and an outlet. The cartridge valve includes three ports, distributed as an inlet end, an outlet end, and a rear end; The pressure oil tank is equipped with an oil suction port; The hydraulic actuator includes an actuator cylinder barrel and an actuator cylinder piston rod. The actuator cylinder piston rod is installed inside the actuator cylinder barrel to divide the actuator cylinder barrel into a rodless chamber and a rod chamber. The power cylinder includes a cylinder barrel and a piston rod installed inside the cylinder barrel. The area where the piston rod is located inside the cylinder barrel is the rod chamber. The rod chamber is connected to one end of a conventional check valve and a hydraulically controlled check valve, respectively. The other end of the ordinary one-way valve is connected to one end of the oil suction pipe. The other end of the oil suction pipe is divided into two paths: one path is connected to one end of the control ball valve, and the other path is connected to the pilot oil port of the two-position two-way valve. The other end of the control ball valve is connected to the oil inlet of the pressure oil tank; the control ball valve is driven to open and close by the hydraulic actuator. The other end of the hydraulic check valve is connected to one end of the drain pipe. The other end of the drain pipe is divided into two paths: one path connects to the inlet of the cartridge valve, and the other path connects to the rodless chamber of the actuator cylinder. The control port of the hydraulic check valve is connected to the outlet of the two-position two-way valve. When there is no pressure oil signal at the control port of the hydraulic check valve, the hydraulic check valve can only be opened in one direction. When there is a pressure oil signal at the control port of the hydraulic check valve, the hydraulic check valve can be opened in both directions. The outlet of the cartridge valve is divided into four branches: the main branch is connected to the accumulator, the second branch is connected to the rear end of the cartridge valve, the third branch is connected to the rod chamber of the actuator cylinder, and the fourth branch is connected to the inlet of the two-position two-way valve.

2. The wave energy hydraulic energy conversion system with anti-continuous oil leakage function as described in claim 1, characterized in that, The hydraulic actuator also includes a rack and a gear. The rack is connected to the piston rod of the actuator cylinder, and the gear meshes with the rack. The gear is connected to the handle of the control ball valve via a shaft to drive the opening and closing of the control ball valve.

3. The wave energy hydraulic energy conversion system with anti-continuous oil leakage function as described in claim 2, characterized in that, When the actuator cylinder piston rod moves to the right, it pushes the rack to the right, and the gear meshing with it rotates counterclockwise. When the actuator cylinder moves to the left, it pulls the rack to move to the left in sync, and the gear meshing with it rotates clockwise. During the rotation of the gear, it drives the control ball valve handle to rotate, thereby driving the opening and closing of the control ball valve.

4. The wave energy hydraulic energy conversion system with anti-continuous oil leakage function as described in claim 1, characterized in that, The pressure oil tank is equipped with a return oil port, which is connected to the outlet of the hydraulic motor.

5. The wave energy hydraulic energy conversion system with anti-continuous oil leakage function as described in claim 4, characterized in that, The air pressure above the liquid level in the pressure tank is between 0.3 and 0.5 MPa.

6. The wave energy hydraulic energy conversion system with anti-continuous oil leakage function as described in claim 1, characterized in that, The outlet of the accumulator is connected to the control valve group and the hydraulic motor. When the accumulator pressure reaches the set value, the control valve group is automatically opened / closed, driving the hydraulic motor to rotate and driving the generator to generate electricity. During the rotation of the motor, the hydraulic oil returns to the pressure tank through the motor outlet.

7. The wave energy hydraulic energy conversion system with anti-continuous oil leakage function as described in claim 1, characterized in that, The oil suction pipe is an oil suction hose, and the oil discharge pipe is an oil discharge hose.

8. The wave energy hydraulic energy conversion system with anti-continuous oil leakage function as described in claim 4, characterized in that, In normal operation, the power hydraulic cylinder reciprocates under wave drive. When the piston rod of the power hydraulic cylinder moves upward, the hydraulic oil in the rod chamber of the hydraulic cylinder is compressed into high pressure and enters the inlet of the cartridge valve through the hydraulic control check valve and the drain pipe. The drain pipe also has another branch leading to the connection port of the rodless chamber of the actuator cylinder. After the high-pressure hydraulic oil enters the cartridge valve, it flows out through the outlet of the cartridge valve in four branches. The main branch enters the accumulator for energy storage and pressure stabilization. The second branch enters the rear end of the cartridge valve, so that the oil in the cartridge valve will not flow back from the outlet to the inlet. The third branch connects to the connection port of the rod chamber of the actuator cylinder, the piston rod of the actuator cylinder is in the fully extended state, and the control ball valve is in the open state. The fourth branch leads to the inlet of the two-position two-way valve. The inlet and outlet of the two-position two-way valve are not connected. There is no pressure signal input to the control port of the hydraulic control check valve. The hydraulic control check valve can only be opened from left to right. When the working hydraulic cylinder moves downward, the rod chamber of the working hydraulic cylinder will draw oil from the pressure oil tank through a common check valve, a suction hose, and a control ball valve. Driven by the continuous wave action, the hydraulic cylinder continuously performs normal oil intake and discharge operations.

9. The wave energy hydraulic energy conversion system with anti-continuous oil leakage function as described in claim 4, characterized in that, When the drain pipe ruptures, the piston rod of the hydraulic actuator cylinder will move to the left and be in a retracted state. During the retraction process, the rack will drive the gear to rotate, which in turn pushes the control ball valve handle to rotate, causing the control ball valve to close and cutting off the oil supply to the working hydraulic cylinder.

10. The wave energy hydraulic energy conversion system with anti-continuous oil leakage function as described in claim 4, characterized in that, When the suction hose ruptures, the piston rod of the hydraulic actuator cylinder will move to the left and be in a retracted state. During the retraction process, the rack will drive the gear to rotate, which in turn pushes the control ball valve handle to rotate, causing the control ball valve to close and cutting off the oil supply to the working hydraulic cylinder.

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