CN217107298U - Wave energy oscillating floater hydraulic conversion system capable of self-protecting - Google Patents

Abstract

The utility model discloses a self-protective hydraulic conversion system of wave energy oscillating floater, which comprises a floater and a piston cylinder connected with the floater, wherein the piston cylinder comprises a cylinder body and a piston rod, the floater is connected with one end of the piston rod extending out of the cylinder body, and the inside of the cylinder body is divided into a working cavity and a non-pressure cavity by the piston rod; the working cavity is filled with hydraulic oil, the working cavity is connected with the energy accumulator, a first one-way valve for limiting the hydraulic oil from flowing back to the working cavity from the energy accumulator is arranged between the working cavity and the energy accumulator, the energy accumulator is connected with an oil outlet pipeline, and the first pressure valve and the power generation assembly are sequentially arranged on the oil outlet pipeline. The non-pressure cavity is connected with a switching assembly, and the switching assembly is used for switching and is connected with the non-pressure cavity and the oil outlet pipeline. The utility model discloses under the big unrestrained condition, retrieve to oscillating float formula and break away from the sea or with its lock solid, make it protected, avoid being damaged by violent oscillation in big unrestrained.

Description

Self-protecting wave energy oscillating float hydraulic conversion system

technical field

The utility model particularly relates to a self-protecting wave energy oscillating float hydraulic conversion system.

Background technique

In the related research in the marine field, the continuous supply of electricity in the ocean far from the land has become a bottleneck restricting development, and the use of clean energy such as waves for power generation and supply has become a new technology for the efficient conversion and utilization of renewable energy. The oscillating floating type converts the energy of the wave into its own kinetic energy through the float, and then drives the rear turning mechanism to form electrical energy. However, due to the erratic weather at sea, under severe weather conditions, the general oscillating floating power generation method is prone to problems such as overload and severe impact.

Utility model content

Aiming at the deficiencies of the prior art, the utility model provides a self-protecting wave energy oscillating float hydraulic conversion system.

For achieving the above object, the technical scheme of the present utility model is:

A self-protecting wave energy oscillating float hydraulic conversion system includes a float and a piston cylinder connected with the float, the piston cylinder includes a cylinder block and a piston rod, and the float is connected to one end of the piston rod extending out of the cylinder, The inside of the cylinder is divided into a working chamber and a pressureless chamber by the piston rod;

It also includes an accumulator, a first pressure valve, and a power generation assembly. The working chamber is filled with hydraulic oil, and the working chamber is connected to the accumulator, and there is a limit between the two that prevents the hydraulic oil from accumulating energy. The accumulator returns to the first one-way valve of the power chamber, the accumulator is connected with an oil outlet pipeline, and the first pressure valve and the power generation assembly are sequentially arranged on the oil outlet pipeline.

The pressureless chamber is connected with a switching component, and the switching component is used for switching the connecting pipeline connected with the pressureless chamber, and the connecting pipeline includes an atmospheric pipeline for connecting the pressureless chamber to the atmosphere and a connecting pipeline for connecting the pressureless chamber to the air. The overload pipeline of the oil pipeline is connected to the oil outlet pipeline between the accumulator and the first pressure valve.

Further, the switching assembly includes a first switching valve disposed on the overload pipeline, and the first switching valve is used to switch the connecting pipeline connected to the pressureless chamber.

Further, the switching assembly further includes a second switching valve arranged on the overload pipeline, the second switching valve is used to switch whether the overload pipeline is connected with 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 station switching pressure of the first switching valve, the first switching valve communicates the overload pipeline and the pressureless chamber.

Further, the oil outlet pipeline further includes an overflow pipeline, the overflow pipeline communicates with the oil outlet pipeline, and a second pressure valve is provided on the overflow pipeline.

Further, the power generation assembly includes a hydraulic motor connected to the oil outlet pipeline and a generator connected to the hydraulic motor.

Further, the working chamber is also connected with an oil supply pipeline, and the oil supply pipeline is connected with an oil tank.

Further, the oil supply pipeline is also provided with a second one-way valve, and the second one-way valve is used to restrict the return of the hydraulic oil in the power chamber to the oil tank.

Compared with the prior art, the utility model has the following advantages:

The utility model utilizes the hydraulic system to absorb the wave energy through the oscillating float, and then utilizes the hydraulic conversion to generate electric energy; meanwhile, in the case of large waves, the oscillating float is recovered from the sea surface or locked, so as to be protected and avoid the It was damaged by violent oscillation in the big waves, so that the sustainable operation was guaranteed in the development and utilization of marine resources.

Description of drawings

1 is a schematic structural diagram of a float and a piston cylinder of a self-protecting wave energy oscillating float hydraulic conversion system;

Figure 2 is a schematic structural diagram of a float and a piston cylinder of a self-protecting wave energy oscillating float hydraulic conversion system;

Figure 3 is a schematic diagram of a connection structure module of a self-protecting wave energy oscillating float hydraulic conversion system;

Description of reference numerals: 11, working chamber; 12, pressureless chamber; 13, piston rod; 14, cylinder body; 15, fixed seat; 16, float; 1, second check valve; 2, first check 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. Fuel tank.

Detailed ways

In order to make the above objects, features and advantages of the present utility model more clearly understood, the present utility model will be described in further detail below with reference to the accompanying drawings and specific embodiments.

In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, only for the purpose of For the convenience of describing the present invention and simplifying the description, it is not intended to indicate or imply that the system or element referred to must have a specific orientation, as well as a specific orientation configuration and operation, and therefore should not be construed as a limitation of the present invention. In addition, "first" and "second" are for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature delimited with "first", "second" may expressly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

In the description of the present utility model, it should be noted that, unless otherwise expressly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection. Connection, or integral connection; may be mechanical connection or electrical connection; may be direct connection, or indirect connection through an intermediate medium, or internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

Example

As shown in Figures 1 to 3, a self-protecting wave energy oscillating float hydraulic conversion system includes a float 16 and a piston cylinder connected to the float 16. The piston cylinder includes a cylinder block 14 and a piston rod 13, and the float 16 is connected to the The end of the piston rod 13 protruding out of the cylinder 14, the cylinder 14 is divided into a working chamber 11 and a pressureless chamber 12 by the piston rod 13; it also includes an accumulator 3, a first pressure valve 4, a power generation component, and a working chamber 11 Filled with hydraulic oil, the working chamber 11 is connected to the accumulator 3, and there is a first check valve 2 between the two that restricts the hydraulic oil from returning from the accumulator 3 to the working chamber 11. The accumulator 3 is connected with an oil outlet pipeline, and the first pressure valve 4 and the power generation assembly are sequentially arranged on the oil outlet pipeline.

Specifically, as shown in FIG. 1 and FIG. 2 , the float 16 is connected to the piston cylinder, and the piston cylinder includes the piston cylinder and the cylinder block 14 , and the cylinder block 14 can be fixed on the offshore power generation equipment by connecting with the fixed seat 15 , so that the float 16 With the wave moving up and down, the design of the piston cylinder includes two types. The piston rod 13 protrudes from the top of the cylinder body 14. The float 16 is connected to the top of the piston rod 13. The integral piston cylinder is set below the sea level. The rod chamber is the work chamber 11, and the rodless chamber is the pressureless chamber 12; or the piston rod 13 protrudes from the bottom of the cylinder 14, the float 16 is connected to the end of the piston rod 13, and the integral piston cylinder is set above the sea level, The rod chamber in the piston cylinder is the pressureless chamber 12 , and the rodless chamber is the work chamber 11 . In the above two cases, the upper half of the cavity in the cylinder 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, it will compress the working chamber 11. volume, so as to press out the hydraulic oil in the working chamber 11 from the working chamber 11 .

As shown in FIG. 3 , the first one-way valve 2 connected between the working chamber 11 and the accumulator 3 can make the hydraulic oil in the working chamber 11 only lead to the accumulator 3 in one direction, and the accumulator 3 When the hydraulic oil pressure P0 rises, the hydraulic oil can only discharge the pressure 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, so that the hydraulic oil can be discharged from the oil outlet pipeline. The hydraulic oil flows through the hydraulic motor 6 to drive the hydraulic motor 6 to rotate and drive the generator 7 to generate electricity. The end of the oil outlet pipeline can lead to the oil tank 10 to collect the hydraulic oil again.

In fact, the pressureless chamber 12 of the piston cylinder is communicated with the atmosphere to ensure that the piston rod 13 can move downward at will. At the same time, the working chamber 11 is also provided with an oil supply pipeline for supplementing the hydraulic oil in the working chamber 11. The oil supply pipe There is only one connection port on the working chamber 11, through which the oil supply pipeline and the accumulator 3 are connected at the same time, or two different connection ports can be provided to connect the oil supply respectively. Line and accumulator 3. The oil supply pipeline is also provided with a second one-way valve 1 to restrict the hydraulic oil in the power chamber 11 from returning to the oil tank 10, so that when the power chamber 11 is compressed, the hydraulic oil can only pass through the first one-way valve 2. It flows in the direction of the accumulator 3 and cannot flow in the direction of the oil tank 10 to ensure the stability of the supply pressure. When expanding the working chamber 11, the hydraulic oil can only be pumped from the fuel tank 10 to the working chamber 11 through the second check valve 1. Inside, hydraulic oil cannot be pumped from the direction of accumulator 3.

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

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 at will. The purpose of adding the switching component is to make the pressureless chamber 12 communicate 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 is increased. The pressure can play a certain role in relieving; 2. The pressure of the oil outlet pipeline is discharged to the pressureless chamber 12, so it is equal to the connection between the working chamber 11 and the pressureless chamber 12, so that the working chamber 11 provides the pressure to the accumulator 3. It is completely transferred to the pressureless chamber 12, so that the hydraulic oil pressure P0 in the accumulator 3 and the oil outlet pipeline will not continue to rise; The communication is one-way communication. At the same time, because the pressureless chamber 12 is no longer in communication with the atmosphere, the pressure in the pressureless chamber 12 cannot be released. Therefore, due to the existence of the oil pressure in the pressureless chamber 12, the piston rod 13 is kept at the upper limit. The position can no longer be lowered, so that the whole work is suspended to avoid excessive rise of internal pressure and cause failure.

When it needs to be restored, it is only necessary to activate the switching component to switch the pressureless chamber 12 to the atmosphere again. At this time, the hydraulic oil in the pressureless chamber 12 will flow out from the atmospheric pipeline, so the outlet of the atmospheric pipeline is set Above the oil tank 10, the trouble of recovering the hydraulic oil can be effectively reduced, and at the same time, the communication between the atmospheric pipeline and the atmosphere will not be hindered. Since the pressures are equal everywhere after the pipelines are connected, in fact, the connection position of the overload pipeline can be set anywhere in the oil outlet pipeline, so that the pressure of the oil outlet pipeline can be released and the internal pressure can be maintained. Within the designed working range, and specifically in this embodiment, it is arranged between the first pressure valve 4 and the accumulator 3. The advantage of this arrangement is that, in addition to releasing the pressure, due to the first pressure valve The pressure between 4 and the accumulator 3 will be maintained at the preset pressure value P1 of the first pressure valve 4, so it will be able to continuously provide pressure for the pressureless chamber 12, so that the pressureless chamber 12 can be artificially restored. Before switching to connecting to the atmospheric pipeline, the float 16 can be kept at the upper limit position for protection.

In a certain embodiment, the oil outlet pipeline further includes an overflow pipeline, the overflow pipeline is communicated with the oil outlet pipeline, and the overflow pipeline is provided with a second pressure valve 8 .

Specifically, the function of the overflow pipeline is that when the hydraulic oil pressure P0 in the oil outlet pipeline is too large, another oil discharge pipeline is added to release the pressure in the oil outlet pipeline. When the hydraulic oil pressure P0 is greater than the second pressure When the preset pressure value of valve 8 is P2, the overflow pipeline will be connected, so that part of the hydraulic oil in the oil outlet pipeline is discharged from the overflow pipeline to the oil tank 10, so that the pressure drop in the oil outlet pipeline is kept less than the first. The pre-set pressure value P2 of the second pressure valve 8 is below, to ensure that the internal pressure of the oil outlet pipeline is within the normal working range. Since the pressures are equal everywhere after the pipelines are connected, the connection position of the overflow pipeline can be set anywhere in the oil outlet pipeline, specifically in this embodiment, it is set between the first pressure valve 4 and the oil outlet pipeline. between power generation components.

In a certain embodiment, the switching assembly includes a first switching valve 9 disposed on the overload pipeline, and the first switching valve 9 is used to switch the connecting pipeline connected to the pressureless chamber 12 .

Specifically, the first switching valve 9 can be a solenoid valve, which is arranged on the overload pipeline and controls 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 The connection with the atmospheric line is switched to the connection with the overload line, so as to realize the effect of switching the assembly.

In a certain embodiment, the switching assembly further includes a second switching valve 5 disposed on the overload pipeline, the second switching valve 5 is used to switch whether the overload pipeline is communicated with the oil outlet pipeline, and the first switching valve 9 is a pressure Switching valve, when the oil pressure in the overload pipeline is higher than the station switching pressure of the first switching valve 9 , the first switching valve 9 connects the overload pipeline and the pressureless chamber 12 .

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 and connects the oil outlet pipeline and the overload pipeline. , when the hydraulic oil pressure in the oil outlet pipeline received in the overload pipeline is higher than the station switching pressure of the first switching valve 9, the first switching valve 9 will be activated to make the pressure-free chamber 12 communicate with the overload pipeline. . The advantage of this setting method is that there are two work protection triggers. The first is that the second switching valve 5 is switched by control to artificially connect the overload pipeline and the oil outlet pipeline, and the second is that the first switching valve is connected. 9 is a pressure switching valve, and the pressure of the hydraulic oil in the overload pipeline needs to be higher than a certain pressure, so that the pressureless chamber 12 can be communicated with the overload pipeline. 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 can be adjusted: it can be set to be higher than the preset pressure value P1 of the first pressure valve 4 (It may be higher than the preset pressure value P2 of the second pressure valve 8, or not higher than the preset pressure value P2 of the second pressure valve 8), when set in this way, the pressure of the accumulator 3 will exceed the normal power generation under severe sea conditions Under the premise of the pressure value P1, the second switching valve 5 as a solenoid valve can be switched to raise the float, and then the second switching valve 5 can be closed, so that the overload pipeline is closed to maintain the pressure, and the float 16 can be protected from being raised. The higher pressure is also beneficial to avoid the pressure change of the pressureless chamber 12 caused by the shaking of the float 16; when the wind and waves become smaller, open the second switching valve 5 to release the pressure of the overloaded pipeline and reduce it to the pressure value P1, the first switching valve 9 will be reset, and at the same time, the connection between the overload pipeline and the pressure-free chamber 12 will be automatically released, and the pressure-free chamber 12 and the atmospheric pipeline will be connected to release the pressure in the pressure-free chamber 12, so that the system can continue to generate electricity intermittently; The switching pressure value of the first switching valve 9 is set to be lower than the preset pressure value P1 of the first pressure valve 4, so that the float 16 can be easily dragged away from the water surface for easy maintenance under normal small wind and wave conditions. The reason why the switching pressure value of the first switching valve 9 is set to be adjustable is because the different sizes of the floats 16 have different response pressure load range characteristics under different wave conditions.

A self-protecting wave energy oscillating float hydraulic conversion control method adopts the above-mentioned self-protecting wave energy oscillating float hydraulic conversion system, and the specific method includes: normal working conditions and severe working conditions;

In normal working conditions, the float 16 drives the piston rod 13 to move with the wave motion. When the float 16 moves upward, the piston rod 13 compresses the inner volume of the working chamber 11, so that the hydraulic oil in the working chamber 11 is sent to the energy storage through the first one-way valve 2. The hydraulic oil pressure in 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 assembly to drive the power generation assembly to generate electricity, while the hydraulic oil The oil flows from the oil outlet pipeline to the oil tank 10 for recovery to complete power generation. When the hydraulic oil pressure is greater than the preset pressure of the second pressure valve 8 , the hydraulic oil flows out from the overflow pipeline to the oil tank 10 for recovery.

Specifically, the float 16 moves up and down with the wave motion, and drives the telescopic rod to move up and down, thereby repeatedly compressing the volume of the work chamber 11 in the piston cylinder. When the volume of the work chamber 11 is compressed, the hydraulic oil in the work chamber 11 It is sent to the accumulator 3 through the first one-way valve 2. When the power chamber 11 is easy to expand, the power chamber 11 draws the hydraulic oil from the oil tank 10 into the power chamber 11 through the oil supply pipeline, thereby maintaining the power chamber 11. The interior is always in a state full of hydraulic oil, and the pressureless chamber 12 will not affect the movement of the piston rod 13 because it communicates with the atmospheric pipeline.

When the hydraulic oil in the working chamber 11 is passed into the accumulator 3, since the accumulator 3 is connected with the oil outlet pipeline, the overall internal pressure is in the same state, and the internal hydraulic oil pressure P0 gradually increases. When the hydraulic oil pressure When P0 is greater than the preset pressure value P1 of the first pressure valve 4, the hydraulic oil will break through the first pressure valve 4, flow to the hydraulic motor 6, drive the hydraulic motor 6 to rotate and drive the generator 7 to generate electricity, and finally return to the oil tank 10 . When the wave becomes larger, the hydraulic oil pressed into the accumulator 3 will also increase. Since the parameters such as the pipe diameter, length, and outlet of the oil outlet pipeline are fixed, as the hydraulic oil pressed in increases, the oil outlet pipeline The hydraulic oil pressure P0 inside will also gradually increase. When the hydraulic oil pressure P0 is greater than the preset pressure value P2 of the second pressure valve 8, it will break through the second pressure valve 8 and flow out from the overflow pipeline to release The pressure in the oil outlet pipeline plays a protective role.

In severe working conditions, with the increase of waves, the float 16 drives the piston rod 13 to move, rapidly increasing the hydraulic oil pressure of the accumulator 3 and the oil outlet pipeline. When the hydraulic oil pressure reaches the pressure value of the preset working range, it starts The switching component communicates the pressure-free chamber 12 with the overload pipeline, and provides a certain pressure in the pressure-free chamber 12, so that the float 16 cannot move downward;

When the bad working condition returns to the normal working condition, the switching component is activated to make the pressureless chamber 12 communicate with the atmospheric pipeline, and the hydraulic oil in the pressureless chamber 12 is discharged and recovered into the oil tank 10. At this time, the float 16 returns to normal with the following conditions. Floating up and down with waves.

Specifically, in the working condition of bad weather, due to the violent fluctuation of waves, the float 16 drives the piston rod 13 to move, so that the hydraulic oil pressure P0 in the accumulator 3 and the oil outlet pipeline increases rapidly. When the overall system is designed, it is necessary to make corresponding settings for the working range of its internal pressure. If the wave fluctuation is too large, causing the internal pressure to exceed the preset working range, the switching components can be remotely controlled. Switch the connecting line of the pressureless chamber 12. Specifically, the second switching valve 5 can be controlled by remote control to connect the overload pipeline and the oil outlet pipeline, so that the overload pipeline can share the hydraulic oil pressure in the oil outlet pipeline. The first switching valve 9 is triggered to switch the pressure-free chamber 12 to be connected to the overload pipeline, so that the pressure-free chamber 12 is communicated with the accumulator 3, and the pressure released in the accumulator 3 becomes the thrust that pushes the piston rod 13 to move upward. , to raise the float to a safe position.

When it is necessary to return to the normal working state, it is only necessary to remotely control the switching components to connect the pressureless chamber 12 with 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. The pressure in the pressureless chamber 12 is released, so that the float 16 can return to free up and down movement, fall to the sea surface to float, and continue to work normally.

The utility model utilizes the hydraulic system to absorb the wave energy through the oscillating float, and then utilizes the hydraulic conversion to generate electric energy; meanwhile, in the case of large waves, the oscillating float is recovered from the sea surface or locked, so as to be protected and avoid the It was damaged by violent oscillation in the big waves, so that the sustainable operation was guaranteed in the development and utilization of marine resources.

The above-mentioned embodiments are only to illustrate the technical concept and characteristics of the present invention, and its purpose is to enable those of ordinary skill in the art to understand the content of the present invention and implement it accordingly, and cannot limit the protection scope of the present invention with this. . All equivalent changes or modifications made according to the essence of the content of the present invention should be covered within the protection scope of the present invention.

Claims (7)

1. The utility model provides a but self-protection's wave energy vibration float hydraulic pressure conversion system which characterized in that: the piston cylinder comprises a floater (16) and a piston cylinder connected with the floater (16), the piston cylinder comprises a cylinder body (14) and a piston rod (13), the floater (16) is connected to one end, extending out of the cylinder body (14), of the piston rod (13), and the interior of the cylinder body (14) is divided into a working cavity (11) and a non-pressure cavity (12) by the piston rod (13);

the hydraulic power generation device is characterized by further comprising an energy accumulator (3), a first pressure valve (4) and a power generation assembly, wherein the work cavity (11) is filled with hydraulic oil, the work cavity (11) is connected with the energy accumulator (3), a first one-way valve (2) for limiting the situation that the hydraulic oil cannot flow back to the work cavity (11) from the energy accumulator (3) is arranged between the work cavity and the energy accumulator (11), the energy accumulator (3) is connected with an oil outlet pipeline, and the first pressure valve (4) and the power generation assembly are sequentially arranged on the oil outlet pipeline;

the non-pressure cavity (12) is connected with a switching assembly, the switching assembly is used for switching a connecting pipeline connected with the non-pressure cavity (12), the connecting pipeline comprises an atmospheric pipeline enabling the non-pressure cavity (12) to be communicated with the atmosphere and an overload pipeline enabling the non-pressure cavity (12) to be communicated with an oil outlet pipeline, and the overload pipeline is connected to the oil outlet pipeline between the energy accumulator (3) and the first pressure valve (4).

2. The self-protective wave energy oscillating buoy hydraulic conversion system of claim 1, characterized in that: the oil outlet pipeline also comprises an overflow pipeline, the overflow pipeline is communicated with the oil outlet pipeline, and a second pressure valve (8) is arranged on the overflow pipeline.

3. The self-protective wave energy oscillating buoy hydraulic conversion system as claimed in any one of claims 1 or 2, characterized in that: the switching assembly comprises a first switching valve (9) arranged on the overload pipeline, and the first switching valve (9) is used for switching a connecting pipeline connected with the non-pressure cavity (12).

4. The self-protective wave energy oscillating buoy hydraulic conversion system of claim 3, characterized in that: the switching assembly further comprises a second switching valve (5) arranged on the overload pipeline, the second switching valve (5) is used for switching whether the overload pipeline is communicated with the oil outlet pipeline or not, the first switching valve (9) is a pressure switching valve, and when the oil pressure in the overload pipeline is higher than the station switching pressure of the first switching valve (9), the first switching valve (9) is communicated with the overload pipeline and the non-pressure cavity (12).

5. The self-protectable wave energy oscillating buoy hydraulic conversion system as claimed in any one of claims 1 or 2, wherein: the power generation assembly comprises a hydraulic motor (6) connected and arranged on the oil outlet pipeline and a power generator (7) connected with the hydraulic motor (6).

6. The self-protective wave energy oscillating buoy hydraulic conversion system as claimed in any one of claims 1 or 2, characterized in that: the working cavity (11) is also connected with an oil supply pipeline, and the oil supply pipeline is connected with an oil tank (10).

7. The self-protective wave energy oscillating buoy hydraulic conversion system of claim 6, characterized in that: still be equipped with second check valve (1) on the oil supply pipeline, second check valve (1) are arranged in restricting the hydraulic oil backward flow in doing work chamber (11) to in oil tank (10).

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