Self-protective wave energy oscillation float hydraulic conversion system and control method

Abstract

The present invention discloses a self-protective wave energy oscillating float hydraulic conversion system, comprising a float and a piston cylinder connected to the float, the piston cylinder comprising a cylinder body and a piston rod, the float being connected to the end of the piston rod extending out of the cylinder body, the interior of the cylinder body being divided into a working chamber and a pressure-free chamber by the piston rod; the system also comprises an accumulator, a first pressure valve, and a power generation assembly, the working chamber being filled with hydraulic oil, the working chamber being connected to the accumulator, and a first one-way valve being provided between the two to prevent the hydraulic oil from flowing back from the accumulator to the working chamber, the accumulator being connected to an oil outlet pipeline, the first pressure valve and the power generation assembly being sequentially arranged on the oil outlet pipeline. The pressure-free chamber is connected to a switching assembly, the switching assembly being used to switch the connection between the pressure-free chamber and the oil outlet pipeline. In the event of large waves, the present invention recovers the oscillating float from the sea surface or locks it so that it is protected and prevented from being damaged by severe oscillation in large waves.

Description

Technical Field

[0001] The present invention particularly relates to a self-protective wave energy oscillation float hydraulic conversion system and a control method. Background Art

[0002] With the gradual advancement of the strategy of building a strong maritime nation, the continuous supply of electricity in the ocean, far from land, has become a bottleneck in marine research. Harnessing wave power generation and replenishment, a clean energy source, has become a new technology for the efficient conversion and utilization of renewable energy. Oscillating floating systems use floats to convert wave energy into kinetic energy, which then drives a subsequent converter mechanism to generate electricity. However, due to the unpredictable weather at sea, conventional oscillating floating systems are prone to problems such as overload and severe impact in inclement weather conditions. Summary of the Invention

[0003] In view of the deficiencies in the prior art, the present invention provides a self-protective wave energy oscillation float hydraulic conversion system and a control method.

[0004] To achieve the above object, the technical solution of the present invention is:

[0005] A self-protective wave energy oscillation float hydraulic conversion system includes a float and a piston cylinder connected to the float. The piston cylinder includes a cylinder body and a piston rod. The float is connected to the end of the piston rod extending outside the cylinder body. The interior of the cylinder body is divided into a working chamber and a pressureless chamber by the piston rod.

[0006] It also includes an accumulator, a first pressure valve, and a power generation component. The working chamber is filled with hydraulic oil. The working chamber is connected to the accumulator, and a first one-way valve is provided between the two to prevent the hydraulic oil from flowing back from the accumulator to the working chamber. The accumulator is connected to an oil outlet pipeline, and the first pressure valve and the power generation component are arranged on the oil outlet pipeline in sequence.

[0007] The pressure-free chamber is connected to a switching assembly, which is used to switch the connecting pipeline connected to the pressure-free chamber. The connecting pipeline includes an atmospheric pipeline that connects the pressure-free chamber to the atmosphere and an overload pipeline that connects the pressure-free chamber to the oil outlet pipeline. The overload pipeline is connected to the oil outlet pipeline between the accumulator and the first pressure valve.

[0008] Furthermore, the switching assembly includes a first switching valve provided on the overload pipeline, and the first switching valve is used to switch the connecting pipeline connected to the pressureless chamber.

[0009] Furthermore, the switching assembly also includes a second switching valve arranged on the overload pipeline, the second switching valve is used to switch whether the overload pipeline is connected to the oil outlet pipeline, and the first switching valve is a pressure switching valve. When the oil pressure in the overload pipeline is higher than the working position switching pressure of the first switching valve, the first switching valve connects the overload pipeline with the pressure-free chamber.

[0010] Furthermore, the oil outlet pipeline also includes an overflow pipeline, the overflow pipeline is communicated with the oil outlet pipeline, and a second pressure valve is provided on the overflow pipeline.

[0011] Furthermore, the power generation assembly includes a hydraulic motor connected to the oil outlet pipeline and a generator connected to the hydraulic motor.

[0012] Furthermore, the working chamber is also connected to an oil supply pipeline, and the oil supply pipeline is connected to an oil tank.

[0013] Furthermore, a second one-way valve is provided on the oil supply pipeline, and the second one-way valve is used to limit the hydraulic oil in the working chamber from flowing back into the oil tank.

[0014] A self-protective wave energy oscillating float hydraulic conversion control method, using the above-mentioned self-protective wave energy oscillating float hydraulic conversion system, specifically including: normal working conditions and severe working conditions;

[0015] In the normal working condition, the float moves with the wave motion, driving the piston rod to move. When the float moves upward, the piston rod compresses the volume of the working chamber, causing the hydraulic oil in the working chamber to be sent to the accumulator through the first one-way valve, thereby increasing the hydraulic oil pressure in the accumulator and the oil outlet pipeline. When the hydraulic oil pressure is greater than the preset pressure of the first pressure valve, the hydraulic oil flows through the power generation component to drive the power generation component to generate electricity. At the same time, the hydraulic oil flows from the oil outlet pipeline to the oil tank for recovery, completing power generation.

[0016] In the aforementioned harsh working conditions, as the waves grow, the float drives the piston rod to move, rapidly increasing the hydraulic oil pressure in the accumulator and the oil outlet pipeline. When the hydraulic oil pressure reaches a pressure value within a preset working range, the switching component is activated to connect the pressureless chamber with the oil outlet pipeline, providing a certain pressure in the pressureless chamber, preventing the float from moving downward.

[0017] When the severe working conditions return to normal conditions, the switching component is started to connect the pressureless chamber with the atmospheric pipeline, the hydraulic oil in the pressureless chamber is discharged and recovered into the oil tank. At this time, the float returns to normal and floats up and down with the waves.

[0018] Furthermore, under normal working conditions, when the hydraulic oil pressure is greater than the preset pressure of the second pressure valve, the hydraulic oil flows out of the overflow pipeline to the oil tank for recovery.

[0019] Compared with the prior art, the present invention has the following advantages:

[0020] The present invention utilizes a hydraulic system to absorb the energy of waves through an oscillating float, and then utilizes hydraulic conversion to generate electrical energy. At the same time, in the case of large waves, the oscillating float is recovered from the sea surface or locked to protect it, thereby avoiding damage caused by severe oscillation in large waves, thereby ensuring sustainable operation in the development and utilization of marine resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of the structure of the float and piston cylinder of the self-protective wave energy oscillation float hydraulic conversion system;

[0022] Figure 2 A schematic diagram of the structure of the float and piston cylinder of the self-protective wave energy oscillation float hydraulic conversion system;

[0023] Figure 3 Schematic diagram of the connection structure modules of the self-protective wave energy oscillation float hydraulic conversion system;

[0024] Explanation of the accompanying symbols: 11. working chamber; 12. pressure-free chamber; 13. piston rod; 14. cylinder body; 15. fixed seat; 16. float; 1. second one-way valve; 2. first one-way valve; 3. accumulator; 4. first pressure valve; 5. second switching valve; 6. hydraulic motor; 7. generator; 8. second pressure valve; 9. first switching valve; 10. oil tank. DETAILED DESCRIPTION

[0025] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] In the description of the present invention, it should be understood that the terms "up", "down", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the system or element referred to must have a specific direction, and a specific direction structure and operation, and therefore, cannot be understood as a limitation on the present invention. In addition, "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0027] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0028] Example

[0029] like Figures 1 to 3 As shown, a self-protective wave energy oscillation float hydraulic conversion system includes a float 16 and a piston cylinder connected to the float 16, the piston cylinder includes a cylinder body 14 and a piston rod 13, the float 16 is connected to the end of the piston rod 13 extending outside the cylinder body 14, and the interior of the cylinder body 14 is divided into a working chamber 11 and a pressure-free chamber 12 by the piston rod 13; it also includes an accumulator 3, a first pressure valve 4, and a power generation component. The working chamber 11 is filled with hydraulic oil, and the working chamber 11 is connected to the accumulator 3, and a first one-way valve 2 is provided between the two to prevent the hydraulic oil from flowing back from the accumulator 3 to the working chamber 11. The accumulator 3 is connected to an oil outlet pipeline, and the first pressure valve 4 and the power generation component are arranged on the oil outlet pipeline in sequence.

[0030] Specifically, if Figure 1 and Figure 2 As shown, the float 16 is connected to the piston cylinder, which includes a piston cylinder and a cylinder body 14. The cylinder body 14 can be fixed to the offshore power generation equipment by connecting to the fixing seat 15, so that the float 16 moves up and down with the waves. The design of the piston cylinder includes two types. The piston rod 13 extends from the top of the cylinder body 14, and the float 16 is connected to the top of the piston rod 13. The entire piston cylinder is arranged below the sea level, and the rod chamber in the piston cylinder is the working chamber 11, and the rodless chamber is the pressureless chamber 12; or the piston rod 13 extends from the bottom of the cylinder body 14, and the float 16 is connected to the end of the piston rod 13. The entire piston cylinder is arranged above the sea level, and the rod chamber in the piston cylinder is the pressureless chamber 12, and the rodless chamber is the working chamber 11. In both of the above cases, the upper half of the cavity in the cylinder body 14 is used as the working chamber 11, and the lower half of the cavity is used as the pressureless chamber 12, so that when the float 16 floats up with the waves, the volume of the working chamber 11 will be compressed to press the hydraulic oil in the working chamber 11 out of the working chamber 11.

[0031] like Figure 3As shown, the first one-way valve 2 connected between the working chamber 11 and the accumulator 3 can only allow the hydraulic oil in the working chamber 11 to flow into the accumulator 3 in one direction. When the hydraulic oil pressure P0 in the accumulator 3 rises, the hydraulic oil can only be discharged through the oil outlet pipeline. The oil outlet pipeline is provided with a first pressure valve 4 and a power generation component in sequence, so that the hydraulic oil pressure P0 in the oil outlet pipeline needs to be greater than the preset pressure value P1 of the first pressure valve 4 before the hydraulic oil can flow out of the oil outlet pipeline and generate electricity through the power generation component. The power generation component may specifically include a hydraulic motor 6 and a generator 7. The hydraulic oil flows through the hydraulic motor 6, drives the hydraulic motor 6 to rotate and drives the generator 7 to generate electricity. The end of the oil outlet pipeline can be connected to the oil tank 10 to collect the hydraulic oil again.

[0032] In practice, the pressureless chamber 12 of the piston cylinder is connected to the atmosphere to ensure that the piston rod 13 can move downward freely. The working chamber 11 is also provided with an oil supply line for replenishing the hydraulic oil in the working chamber 11. The oil supply line is connected to the oil tank 10. The working chamber 11 may have only one connection port, through which the oil supply line and the accumulator 3 are simultaneously connected, or it may have two different connection ports, one for connecting the oil supply line to the accumulator 3 separately. A second one-way valve 1 is also provided on the oil supply line to restrict the hydraulic oil in the working chamber 11 from flowing back into the oil tank 10. Therefore, when the working chamber 11 is compressed, the hydraulic oil can only flow in one direction to the accumulator 3 through the first one-way valve 2, and cannot flow toward the oil tank 10, thus ensuring stable supply pressure. When the working chamber 11 is expanded, the hydraulic oil can only be pumped from the oil tank 10 into the working chamber 11 through the second one-way valve 1, and cannot be drawn from the accumulator 3.

[0033] The pressure-free chamber 12 is connected to a switching component, which is used to switch the connecting pipeline connected to the pressure-free chamber 12. The connecting pipeline includes an atmospheric pipeline that connects the pressure-free chamber 12 to the atmosphere and an overload pipeline that connects the pressure-free chamber 12 to the oil outlet pipeline. The overload pipeline is connected to the oil outlet pipeline between the accumulator 3 and the first pressure valve 4.

[0034] Specifically, under normal working conditions, the pressureless chamber 12 is connected to the atmosphere, so that there is no pressure inside, and the piston rod 13 can move downward freely. The purpose of adding the switching component is to connect the pressureless chamber 12 with the oil outlet pipeline. The effects of this are: 1. Since the pressure in the oil outlet pipeline has an additional pressure relief pipeline path, the pressure in the oil outlet pipeline can be relieved to a certain extent; 2. Since the pressure of the oil outlet pipeline is discharged to the pressureless chamber 12, it is equivalent to connecting the working chamber 11 and the pressureless chamber 12, so that the pressure provided by the working chamber 11 to the accumulator 3 is completely transmitted to the pressureless chamber 12, so that the hydraulic oil pressure P0 in the accumulator 3 and the oil outlet pipeline will no longer continue to rise; 3. Due to the presence of the first pressure valve 4, the connection between the working chamber 11 and the pressureless chamber 12 is one-way. At the same time, the pressureless chamber 12 is no longer connected to the atmosphere, and the pressure in the pressureless chamber 12 cannot be released. Therefore, due to the oil pressure in the pressureless chamber 12, the piston rod 13 is pressurized and maintained in the upper limit position and cannot drop any further, thereby suspending the entire operation to avoid excessive increase in internal pressure and causing failure.

[0035] When recovery is needed, the switching assembly simply needs to be activated to connect the pressureless chamber 12 to the atmosphere again. The hydraulic oil in the pressureless chamber 12 will then flow out of the atmospheric line. Therefore, positioning the atmospheric line outlet above the oil tank 10 effectively reduces the need for hydraulic oil recovery while also ensuring that the atmospheric line remains connected to the atmosphere. Since the pressures of the pipelines are equalized after they are connected, the overload line connection can be located anywhere in the oil outlet pipeline to release the pressure in the outlet pipeline and maintain the internal pressure within the designed operating range. Specifically, in this embodiment, the overload line is located between the first pressure valve 4 and the accumulator 3. This arrangement offers the advantage of not only releasing pressure but also maintaining the pressure between the first pressure valve 4 and the accumulator 3 at the pressure value P1 preset by the first pressure valve 4. This allows the pressure in the pressureless chamber 12 to be continuously supplied. This allows the float 16 to remain in the upper limit position, providing protection, until the pressureless chamber 12 is manually switched back to the atmospheric line.

[0036] In one embodiment, the oil outlet pipeline further includes an overflow pipeline, which is communicated with the oil outlet pipeline. A second pressure valve 8 is provided on the overflow pipeline.

[0037] Specifically, the overflow line serves to release the pressure in the oil outlet line by providing another oil drain line when the hydraulic oil pressure P0 in the oil outlet line is excessive. When the hydraulic oil pressure P0 exceeds the pressure value P2 preset by the second pressure valve 8, the overflow line is connected, allowing some of the hydraulic oil in the oil outlet line to be discharged from the overflow line to the oil tank 10, thereby reducing the pressure in the oil outlet line to below the pressure value P2 preset by the second pressure valve 8 and ensuring that the pressure in the oil outlet line remains within the normal operating range. Since the pressures in the lines are equalized after connection, the overflow line can be connected anywhere in the oil outlet line. Specifically, in this embodiment, it is located between the first pressure valve 4 and the power generation assembly.

[0038] In one embodiment, the switching assembly includes a first switching valve 9 provided on the overload pipeline. The first switching valve 9 is used to switch the connecting pipeline connected to the pressureless chamber 12 .

[0039] Specifically, the first switching valve 9 can be an electromagnetic valve, which is arranged on the overload pipeline to control the connecting pipeline connected to the pressureless chamber 12. When the first switching valve 9 receives a signal, the pressureless chamber 12 is switched from being connected to the atmospheric pipeline to being connected to the overload pipeline, thereby achieving the effect of the switching component.

[0040] In a certain embodiment, the switching component also includes a second switching valve 5 arranged on the overload pipeline, and the second switching valve 5 is used to switch whether the overload pipeline is connected to the oil outlet pipeline. The first switching valve 9 is a pressure switching valve. When the oil pressure in the overload pipeline is higher than the working position switching pressure of the first switching valve 9, the first switching valve 9 connects the overload pipeline with the pressure-free chamber 12.

[0041] Specifically, in this method, the first switching valve 9 is a pressure switching valve, and the second switching valve 5 is a solenoid valve. When the second switching valve 5 receives a signal, it switches to connect the oil outlet pipeline and the overload pipeline. When the hydraulic oil pressure received in the overload pipeline is higher than the working position switching pressure of the first switching valve 9, the first switching valve 9 is activated to connect the pressureless chamber 12 with the overload pipeline. The advantage of this setting method is that it has two levels of working protection triggering. The first level is that the second switching valve 5 manually connects the overload pipeline and the oil outlet pipeline through control switching. The second level is that the first switching valve 9 is a pressure switching valve. The hydraulic oil pressure in the overload pipeline needs to be higher than a certain pressure before the pressureless chamber 12 and the overload pipeline can be connected. Specifically, the overload pipeline is connected between the first pressure valve 4 and the accumulator 3, and the switching pressure value of the first switching valve 9 is adjustable: it can be set to be higher than the preset pressure value P1 of the first pressure valve 4 (it can be higher than the preset pressure value P2 of the second pressure valve 8, and it can also be not higher than the preset pressure value P2 of the second pressure valve 8). When set in this way, under the premise that the pressure of the accumulator 3 exceeds the pressure value P1 of normal power generation under severe sea conditions, the second switching valve 5 serving as the solenoid valve can be switched to raise the float, and then the second switching valve 5 can be closed to close the overload pipeline to maintain pressure and keep the float 16 in a raised protection state, which is relatively safe. High pressure is also helpful in preventing the float 16 from shaking and causing pressure changes in the pressureless chamber 12. When the wind and waves become smaller, the second switching valve 5 is opened to release the overload pipeline pressure to the pressure value P1, and the first switching valve 9 will reset. At the same time, the connection between the overload pipeline and the pressureless chamber 12 is automatically released, and the pressureless chamber 12 is connected to the atmospheric pipeline, and the pressure in the pressureless chamber 12 is released, so that the system can continue to generate electricity intermittently. The switching pressure value of the first switching valve 9 can also be set to be lower than the preset pressure value P1 of the first pressure valve 4. In normal conditions with small winds and waves, the float 16 can be easily towed away from the water surface for easy maintenance. The reason why the switching pressure value of the first switching valve 9 is set to be adjustable is because floats 16 of different sizes have different characteristics in responding to the pressure load range under different wave conditions.

[0042] A self-protective wave energy oscillating float hydraulic conversion control method, using the above-mentioned self-protective wave energy oscillating float hydraulic conversion system, specifically including: normal working conditions and severe working conditions;

[0043] Under normal operating conditions, the float 16 drives the piston rod 13 to move with the wave movement. When the float 16 moves upward, the piston rod 13 compresses the volume of the working chamber 11, so that the hydraulic oil in the working chamber 11 is sent to the accumulator 3 through the first one-way valve 2, and the hydraulic oil pressure of the accumulator 3 and the oil outlet pipeline is increased. When the hydraulic oil pressure is greater than the preset pressure of the first pressure valve 4, the hydraulic oil flows through the power generation component to drive the power generation component to generate electricity. At the same time, the hydraulic oil flows from the oil outlet pipeline to the oil tank 10 for recovery, completing power generation. When the hydraulic oil pressure is greater than the preset pressure of the second pressure valve 8, the hydraulic oil flows out of the overflow pipeline to the oil tank 10 for recovery.

[0044] Specifically, the float 16 moves up and down with the wave movement, driving the telescopic rod to move up and down, thereby repeatedly compressing the volume of the working chamber 11 in the piston cylinder. When the volume of the working chamber 11 is compressed, the hydraulic oil in the working chamber 11 is sent to the accumulator 3 through the first one-way valve 2. When the working chamber 11 is easy to expand, the working chamber 11 draws hydraulic oil from the oil tank 10 into the working chamber 11 through the oil supply pipeline, thereby keeping the working chamber 11 always full of hydraulic oil. Since the pressureless chamber 12 is connected to the atmospheric pipeline, it will not affect the movement of the piston rod 13.

[0045] When the hydraulic oil in the working chamber 11 flows into the accumulator 3, the accumulator 3, connected to the oil outlet pipeline, maintains a constant internal pressure, and the internal hydraulic oil pressure P0 gradually increases. When the hydraulic oil pressure P0 exceeds the preset pressure value P1 of the first pressure valve 4, the hydraulic oil will break through the first pressure valve 4 and flow to the hydraulic motor 6, driving the hydraulic motor 6 to rotate and drive the generator 7 to generate electricity, and finally return to the oil tank 10. When the waves become larger, the amount of hydraulic oil pressed into the accumulator 3 will also increase. Because the parameters of the oil outlet pipeline, such as the diameter, length, and outlet, are fixed, the hydraulic oil pressure P0 in the oil outlet pipeline will gradually increase as the amount of hydraulic oil pressed in increases. When the hydraulic oil pressure P0 exceeds the preset pressure value P2 of the second pressure valve 8, it will break through the second pressure valve 8 and flow out of the overflow pipeline, releasing the pressure in the oil outlet pipeline and providing protection.

[0046] In severe working conditions, as the waves grow, the float 16 drives the piston rod 13 to move, rapidly increasing the hydraulic oil pressure in the accumulator 3 and the oil outlet pipeline. When the hydraulic oil pressure reaches the pressure value within the preset working range, the switching component is activated to connect the pressureless chamber 12 with the overload pipeline, providing a certain pressure in the pressureless chamber 12, so that the float 16 cannot move downward;

[0047] When the severe working conditions return to normal conditions, the switching component is started to connect the pressureless chamber 12 with the atmospheric pipeline, the hydraulic oil in the pressureless chamber 12 is discharged and recovered into the oil tank 10, and the float 16 returns to normal and floats up and down with the waves.

[0048] Specifically, when working in severe weather conditions, due to the violent fluctuations of the waves, the float 16 drives the piston rod 13 to move, causing the hydraulic oil pressure P0 in the accumulator 3 and the oil outlet pipeline to increase rapidly. Since the overall system needs to make corresponding settings for the working range of the internal pressure it can withstand when designing, if the amplitude of the wave fluctuations is too large, causing the internal pressure to exceed the preset working range, the switching component can be remotely controlled to switch the connecting pipeline of the pressure-free chamber 12. Specifically, the second switching valve 5 can be remotely controlled to connect the overload pipeline and the oil outlet pipeline, so that the overload pipeline shares the hydraulic oil pressure in the oil outlet pipeline. Since its hydraulic oil pressure is too high, it will trigger the first switching valve 9 to switch the pressure-free chamber 12 to connect with the overload pipeline, so that the pressure-free chamber 12 is connected to the accumulator 3. The pressure released in the accumulator 3 becomes the thrust that pushes the piston rod 13 upward, causing the float to rise to a safe position.

[0049] When it is necessary to restore the normal working state, it is only necessary to remotely control the switching component to connect the pressureless chamber 12 to the atmospheric pipeline, so that the hydraulic oil in the pressureless chamber 12 is discharged through the atmospheric pipeline and recovered into the oil tank 10, thereby releasing the pressure in the pressureless chamber 12 and allowing the float 16 to resume free up and down movement, fall to the sea surface and float, and continue normal work.

[0050] The present invention utilizes a hydraulic system to absorb the energy of waves through an oscillating float, and then utilizes hydraulic conversion to generate electrical energy. At the same time, in the case of large waves, the oscillating float is recovered from the sea surface or locked to protect it, thereby avoiding damage caused by severe oscillation in large waves, thereby ensuring sustainable operation in the development and utilization of marine resources.

[0051] The above embodiments are intended only to illustrate the technical concepts and features of the present invention. Their purpose is to enable those skilled in the art to understand the contents of the present invention and implement them accordingly. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications made based on the essence of the present invention are intended to be covered by the scope of protection of the present invention.

Claims

1. A self-protective wave energy oscillation float hydraulic conversion system, characterized by: The invention comprises a float (16) and a piston cylinder connected to the float (16), wherein the piston cylinder comprises a cylinder body (14) and a piston rod (13), wherein the float (16) is connected to an end of the piston rod (13) extending outside the cylinder body (14), and the interior of the cylinder body (14) is divided into a working chamber (11) and a pressureless chamber (12) by the piston rod (13); The invention also includes an accumulator (3), a first pressure valve (4), and a power generation assembly. The working chamber (11) is filled with hydraulic oil. The working chamber (11) is connected to the accumulator (3), and a first one-way valve (2) is provided between the two to prevent the hydraulic oil from flowing back from the accumulator (3) to the working chamber (11). The accumulator (3) is connected to an oil outlet pipeline. The first pressure valve (4) and the power generation assembly are sequentially arranged on the oil outlet pipeline. The pressureless chamber (12) is connected to a switching assembly, the switching assembly being used to switch a connecting pipeline connected to the pressureless chamber (12), the connecting pipeline comprising an atmospheric pipeline for connecting the pressureless chamber (12) to the atmosphere and an overload pipeline for connecting the pressureless chamber (12) to an oil outlet pipeline, the overload pipeline being connected to the oil outlet pipeline between the accumulator (3) and the first pressure valve (4); The oil outlet pipeline further comprises an overflow pipeline, the overflow pipeline being in communication with the oil outlet pipeline, and a second pressure valve (8) being provided on the overflow pipeline; the switching assembly comprises a first switching valve (9) provided on the overload pipeline, the first switching valve (9) being used to switch the connecting pipeline connected to the pressureless chamber (12); the switching assembly further comprises a second switching valve (5) provided on the overload pipeline, the second switching valve (5) being used to switch whether the overload pipeline is in communication with the oil outlet pipeline, the first switching valve (9) being a pressure switching valve, and when the overload pipeline is in communication with the oil outlet pipeline, the first switching valve (9) is in communication with the pressureless chamber (12). When the oil pressure in the circuit is higher than the position switching pressure of the first switching valve (9), the first switching valve (9) connects the overload pipeline with the pressureless chamber (12); the power generation assembly includes a hydraulic motor (6) connected to the oil outlet pipeline and a generator (7) connected to the hydraulic motor (6); the working chamber (11) is also connected to an oil supply pipeline, and the oil supply pipeline is connected to an oil tank (10); a second one-way valve (1) is also provided on the oil supply pipeline, and the second one-way valve (1) is used to limit the hydraulic oil in the working chamber (11) from flowing back to the oil tank (10).

2. A self-protective wave energy oscillation float hydraulic conversion control method, characterized by: The self-protective wave energy oscillation float hydraulic conversion system of claim 1 is used, and the specific method includes: normal working conditions and severe working conditions; In the normal working condition, the float (16) drives the piston rod (13) to move with the wave movement. When the float (16) moves upward, the piston rod (13) compresses the internal volume of the working chamber (11), so that the hydraulic oil in the working chamber (11) is sent to the accumulator (3) through the first one-way valve (2), and the hydraulic oil pressure of the accumulator (3) and the oil outlet pipeline is increased. When the hydraulic oil pressure is greater than the preset pressure of the first pressure valve (4), the hydraulic oil flows through the power generation component to drive the power generation component to generate electricity. At the same time, the hydraulic oil flows from the oil outlet pipeline to the oil tank (10) for recovery, thereby completing power generation. In the severe working condition, as the waves increase, the float (16) drives the piston rod (13) to move, quickly increasing the hydraulic oil pressure of the accumulator (3) and the oil outlet pipeline. When the hydraulic oil pressure reaches a pressure value within a preset working range, the switching component is activated to connect the pressureless chamber (12) with the overload pipeline, providing a certain pressure in the pressureless chamber (12), so that the float (16) cannot move downward; When the severe working condition returns to normal working condition, the switching assembly is started to connect the pressureless chamber (12) with the atmospheric pipeline, the hydraulic oil in the pressureless chamber (12) is discharged and recovered into the oil tank (10), and the float (16) returns to normal and floats up and down with the waves.

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