CN217107298U

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

Info

Publication number: CN217107298U
Application number: CN202121426470.6U
Authority: CN
Inventors: 姜家强; 盛松伟; 叶寅; 李洪进
Original assignee: Guangzhou Institute of Energy Conversion of CAS
Current assignee: Guangzhou Institute of Energy Conversion of CAS
Priority date: 2021-06-25
Filing date: 2021-06-25
Publication date: 2022-08-02
Anticipated expiration: 2031-06-25

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

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

Technical Field

The utility model particularly relates to a wave energy vibration float hydraulic pressure conversion system that can oneself protect.

Background

In the development of relevant research in the marine field, continuous supply of power in the sea far away from land becomes a bottleneck restricting development, and the supply of power generation by using clean energy such as waves becomes a new technology for effectively converting and utilizing renewable energy. The oscillating floating type is that the energy of waves is converted into the kinetic energy of the waves through a floater, and then the following rotating mechanism is driven to form electric energy. However, due to the fact that weather on the sea is unusual, under the working condition of severe weather, problems such as overload and severe impact are prone to occur in a common oscillation floating type power generation mode.

SUMMERY OF THE UTILITY MODEL

Not enough to prior art, the utility model provides a but self-protection's wave energy vibration float hydraulic pressure conversion system.

In order to achieve the above purpose, the technical scheme of the utility model is that:

a wave energy oscillating floater hydraulic conversion system capable of self-protecting 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 to one end, extending out of the cylinder body, of the piston rod, and the interior of the cylinder body is divided into a working cavity and a non-pressure cavity by the piston rod;

still include energy storage ware, first pressure valve, electricity generation subassembly, the intracavity of doing work is filled with hydraulic oil, be connected with the energy storage ware on the chamber of doing work, and be equipped with the first check valve that restriction hydraulic oil can't flow back to the chamber of doing work from the energy storage ware between the two, the energy storage ware is connected with out oil pipe way, first pressure valve and electricity generation subassembly set gradually on an oil pipe way.

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

Further, the switching assembly comprises a first switching valve arranged on the overload pipeline, and the first switching valve is used for switching a connecting pipeline connected with the non-pressure cavity.

Further, the switching component also comprises a second switching valve arranged on the overload pipeline, the second switching valve is used for switching whether the overload pipeline is communicated with the oil outlet pipeline or not, the first switching valve 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, the first switching valve is communicated with the overload pipeline and the non-pressure cavity.

Furthermore, the oil outlet pipeline also comprises an overflow pipeline, the overflow pipeline is communicated with the oil outlet pipeline, and a second pressure valve is arranged on the overflow pipeline.

Further, the electricity generation subassembly is including connecting the hydraulic motor that sets up on the oil pipeline and the generator of being connected with hydraulic motor.

Furthermore, the working cavity is also connected with an oil supply pipeline, and the oil supply pipeline is connected with an oil tank.

Furthermore, a second one-way valve is further arranged on the oil supply pipeline and used for limiting the hydraulic oil in the working cavity to flow back to the oil tank.

Compared with the prior art, the utility model, have following advantage:

the utility model utilizes the hydraulic system to absorb the energy of the waves through the oscillating floater and utilizes the hydraulic conversion to generate the electric energy; meanwhile, under the condition of heavy waves, the oscillating floater is recovered and separated from the sea surface or locked, so that the oscillating floater is protected, damage caused by violent oscillation in the heavy waves is avoided, and sustainable operation is guaranteed in the development and utilization of ocean resources.

Drawings

FIG. 1 is a schematic structural diagram of a floater and a piston cylinder of a self-protection wave energy oscillating floater hydraulic conversion system;

FIG. 2 is a schematic structural diagram of a floater and a piston cylinder of a self-protection wave energy oscillating floater hydraulic conversion system;

FIG. 3 is a schematic diagram of a self-protective wave energy oscillating floater hydraulic conversion system connection structure module;

description of reference numerals: 11. a working cavity; 12. no pressure cavity is formed; 13. a piston rod; 14. a cylinder body; 15. a fixed seat; 16. a float; 1. a second one-way valve; 2. a first check valve; 3. an accumulator; 4. a first pressure valve; 5. a second switching valve; 6. a hydraulic motor; 7. a generator; 8. a second pressure valve; 9. a first switching valve; 10. and an oil tank.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description.

In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, only for convenience of description and simplification of description, but not for indicating or implying that the system or element referred to must have a specific orientation and a specific orientation configuration and operation, and thus, should not be construed as limiting the present invention. Furthermore, "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Examples

As shown in fig. 1 to fig. 3, a self-protection wave energy oscillation floater hydraulic conversion system comprises a floater 16 and a piston cylinder connected with the floater 16, wherein 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 inside of the cylinder body 14 is divided into a working cavity 11 and a non-pressure cavity 12 by the piston rod 13; still include energy storage ware 3, first pressure valve 4, electricity generation subassembly, do and do the work chamber 11 internal filling and be full of hydraulic oil, do and be connected with energy storage ware 3 on the chamber 11, and be equipped with the first check valve 2 that restriction hydraulic oil can't flow back to do the work chamber 11 from energy storage ware 3 between the two, energy storage ware 3 is connected with out oil pipe way, and first pressure valve 4 and electricity generation subassembly set gradually on an oil pipe way.

Specifically, as shown in fig. 1 and fig. 2, the floater 16 is connected with the piston cylinder, the piston cylinder comprises a piston cylinder body 14 and a cylinder body 14, the cylinder body 14 can be connected with a fixed seat 15 and fixed on the offshore power generation equipment, so that the floater 16 moves up and down along with waves, the design of the piston cylinder comprises two types, the piston rod 13 extends out of the top of the cylinder body 14, the floater 16 is connected to the top of the piston rod 13, the whole piston cylinder is arranged below the sea water level, a rod cavity in the piston cylinder is a working cavity 11, and a rodless cavity is a pressureless cavity 12; or the piston rod 13 extends out from the bottom of the cylinder body 14, the floater 16 is connected to the end part of the piston rod 13, the whole piston cylinder is arranged above the sea water level, a rod cavity in the piston cylinder is a non-pressure cavity 12, and a non-rod cavity is a working cavity 11. In both cases, the upper half cavity in the cylinder 14 is used as the working cavity 11, and the lower half cavity is used as the non-pressure cavity 12, so that when the floater 16 floats upwards along with waves, the volume of the working cavity 11 is compressed, and the hydraulic oil in the working cavity 11 is pressed out from the working cavity 11.

As shown in fig. 3, the first check valve 2 connected between the working chamber 11 and the accumulator 3 can make the hydraulic oil in the working chamber 11 only flow into the accumulator 3 in one direction, and when the hydraulic oil pressure P0 in the accumulator 3 rises, the hydraulic oil can only discharge the pressure through the oil discharge pipeline. The first pressure valve 4 and the power generation assembly are sequentially arranged in the oil outlet pipeline, so that when the pressure P0 of hydraulic oil in the oil outlet pipeline needs to be greater than a pressure value P1 preset by the first pressure valve 4, the hydraulic oil can flow out of the oil outlet pipeline, power generation is realized through the power generation assembly, the power generation assembly specifically comprises a hydraulic motor 6 and a power generator 7, the hydraulic oil flows through the hydraulic motor 6, and drives the hydraulic motor 6 to rotate and drive the power generator 7 to generate power. The end of the oil outlet pipe can be communicated to the oil tank 10 to collect the hydraulic oil again.

In fact, the non-pressure chamber 12 of the piston cylinder is communicated with the atmosphere to ensure that the piston rod 13 can move downward at will, and the working chamber 11 is also provided with an oil supply pipeline for supplying hydraulic oil in the working chamber 11, the oil supply pipeline is communicated into the oil tank 10, the working chamber 11 can be provided with only one connector, the oil supply pipeline and the energy accumulator 3 are simultaneously connected through the outlet, and two different connectors can also be provided to respectively connect the oil supply pipeline and the energy accumulator 3. The oil supply pipeline is further provided with a second one-way valve 1 to limit hydraulic oil in the working cavity 11 to flow back to the oil tank 10, so that when the working cavity 11 is compressed, the hydraulic oil can only flow to the energy accumulator 3 through the first one-way valve 2 in a one-way mode and cannot flow towards the direction of the oil tank 10, the pressure supply stability is guaranteed, when the working cavity 11 is expanded, the hydraulic oil can only be pumped into the working cavity 11 from the oil tank 10 through the second one-way valve 1, and the hydraulic oil cannot be pumped from the direction of the energy accumulator 3.

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.

In particular, the pressureless chamber 12 is connected to the atmosphere in normal operating conditions, so that there is no pressure inside, enabling the piston rod 13 to move downwards at will. And the purpose of adding the switching assembly is to communicate the non-pressure cavity 12 with the oil outlet pipeline, which has the following effects: firstly, the pressure in the oil outlet pipeline is increased by one pressure discharge pipeline path, so that the pressure in the oil outlet pipeline can be relieved to a certain extent; secondly, the pressure of the oil outlet pipeline is discharged to the non-pressure cavity 12, so that the working cavity 11 and the non-pressure cavity 12 are communicated, the pressure provided by the working cavity 11 to the energy accumulator 3 is completely transmitted to the non-pressure cavity 12, and the hydraulic oil pressure P0 in the energy accumulator 3 and the oil outlet pipeline cannot rise any more; and thirdly, due to the existence of the first pressure valve 4, the communication between the working cavity 11 and the non-pressure cavity 12 is one-way communication, and meanwhile, the non-pressure cavity 12 cannot release the pressure in the non-pressure cavity 12 due to no longer being communicated with the atmosphere, so that the piston rod 13 is pressed to be kept at the upper limit position and cannot descend due to the existence of the oil pressure in the non-pressure cavity 12, the whole work is suspended, and the fault caused by excessive rise of the internal pressure is avoided.

When the recovery is needed, only the switching component needs to be started to switch the non-pressure cavity 12 to be communicated to the atmosphere again, and at the moment, the hydraulic oil in the non-pressure cavity 12 flows out from the atmosphere pipeline, so that the outlet of the atmosphere pipeline is arranged above the oil tank 10, the trouble of recovering the hydraulic oil can be effectively reduced, and meanwhile, the atmosphere pipeline is not prevented from being communicated with the atmosphere. Since the pressure of the pipeline is equal everywhere after the pipeline is communicated, the connection position of the overload pipeline can be actually arranged at any position of the oil outlet pipeline, namely the pressure of the oil outlet pipeline can be released, so that the internal pressure is kept within the designed working range, and particularly in the embodiment, the overload pipeline is arranged between the first pressure valve 4 and the energy accumulator 3, so that the pressure can be released, and in addition, the pressure between the first pressure valve 4 and the energy accumulator 3 can be maintained at the pressure value P1 preset by the first pressure valve 4, so that the pressure can be continuously supplied to the non-pressure cavity 12, and the float 16 can be kept at the upper limit position to play a protection role before the non-pressure cavity 12 is switched to be connected to an atmosphere pipeline through artificial recovery.

In one embodiment, the oil outlet pipeline further comprises an overflow pipeline, the overflow pipeline is communicated with the oil outlet pipeline, and the second pressure valve 8 is arranged on the overflow pipeline.

Specifically, the overflow pipeline has the function that when the pressure P0 of the hydraulic oil in the oil outlet pipeline is too large, another oil outlet pipeline is additionally arranged to release the pressure in the oil pipeline, and when the pressure P0 of the hydraulic oil is greater than the pressure value P2 preset by the second pressure valve 8, the overflow pipeline is communicated, so that part of the hydraulic oil in the oil outlet pipeline is discharged to the oil tank 10 from the overflow pipeline, the pressure in the oil outlet pipeline is reduced and kept below the pressure value P2 preset by the second pressure valve 8, and the internal pressure of the oil outlet pipeline is ensured to be within the normal working range. Since the pressure in the pipelines is equal everywhere after the pipelines are communicated with each other, the connection position of the overflow pipeline can be arranged at any position of the oil outlet pipeline, particularly between the first pressure valve 4 and the power generation assembly in the embodiment.

In one embodiment the switching assembly comprises a first switching valve 9 arranged on the overload line, the first switching valve 9 being used to switch the connecting line to which the non-pressure chamber 12 is connected.

Specifically, the first switching valve 9 may be an electromagnetic valve, which is disposed on the overload line, and controls the connection line to which the non-pressure chamber 12 is connected, and when the first switching valve 9 receives a signal, the non-pressure chamber 12 is switched from being connected to the atmosphere line to being connected to the overload line, thereby achieving the effect of switching the components.

In one embodiment, the switching assembly further comprises a second switching valve 5 disposed on the overload line, the second switching valve 5 is used for switching whether the overload line is communicated with the oil outlet line, the first switching valve 9 is a pressure switching valve, and when the oil pressure in the overload line is higher than the station switching pressure of the first switching valve 9, the first switching valve 9 is used for communicating the overload line with the no-pressure chamber 12.

Specifically, in this mode, the first switching valve 9 is a pressure switching valve, the second switching valve 5 is an electromagnetic valve, when the second switching valve 5 receives a signal, the second switching valve switches and communicates the oil outlet pipeline and the overload pipeline, and when the hydraulic oil pressure received in the oil outlet pipeline in the overload pipeline is higher than the station switching pressure of the first switching valve 9, the first switching valve 9 is started to communicate the non-pressure chamber 12 with the overload pipeline. The advantage of this arrangement is that two work protection triggers are provided, 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 9 is a pressure switching valve, and the pressure of the hydraulic oil in the overload pipeline is higher than a certain pressure, so that the non-pressure chamber 12 is connected with the overload pipeline. In particular, the overload line is connected between the first pressure valve 4 and the accumulator 3, the switching pressure value of the first switching valve 9 being adjustable: the pressure value P1 preset by the first pressure valve 4 (may be higher than the pressure value P2 preset by the second pressure valve 8, or may be not higher than the pressure value P2 preset by the second pressure valve 8), so that when 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 an electromagnetic valve can be switched to raise the float, and then the second switching valve 5 is closed, so that the overload pipeline is closed and pressure is maintained, the float 16 is maintained in a raised protection state, and the higher pressure is also favorable for preventing the float 16 from shaking to cause pressure change of the non-pressure cavity 12; when the wind wave is reduced, the second switching valve 5 is opened to reduce the pressure of the overload pipeline to a pressure value P1, the first switching valve 9 is reset, meanwhile, the connection between the overload pipeline and the non-pressure cavity 12 is automatically released, the non-pressure cavity 12 is communicated with the atmosphere pipeline, the pressure in the non-pressure cavity 12 is released, and the system can continue to generate power discontinuously; 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, so that the float 16 can be conveniently dragged away from the water surface under the normal small wind and wave working condition, and the maintenance is convenient. The switching pressure value of the first switching valve 9 is set to be adjustable because the response pressure load range characteristics of the floats 16 with different sizes are different under different wave working conditions.

A wave energy oscillating floater hydraulic conversion control method capable of self-protecting adopts the wave energy oscillating floater hydraulic conversion system capable of self-protecting, and the specific method comprises the following steps: normal working conditions and severe working conditions;

in normal working conditions, the floater 16 drives the piston rod 13 to move along with wave movement, when the floater 16 moves upwards, the piston rod 13 compresses the inner volume of the working cavity 11, so that hydraulic oil in the working cavity 11 is sent to the energy accumulator 3 through the first one-way valve 2, the hydraulic oil pressure of the energy accumulator 3 and the oil outlet pipeline is improved, 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 power, meanwhile, the hydraulic oil flows into the oil tank 10 from the oil outlet pipeline to be recovered, the power generation is completed, and 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 be recovered into the oil tank 10.

Specifically, the floater 16 moves up and down along with the wave motion to drive the telescopic rod to move up and down, so that the volume of the working cavity 11 in the piston cylinder is repeatedly compressed, when the volume of the working cavity 11 is compressed, hydraulic oil in the working cavity 11 is sent to the energy accumulator 3 through the first check valve 2, when the working cavity 11 is easily expanded, the working cavity 11 pumps the hydraulic oil into the working cavity 11 from the oil tank 10 through an oil supply pipeline, so that the working cavity 11 is always in a state of being filled with the hydraulic oil, and the non-pressure cavity 12 is communicated with an atmospheric pipeline, so that the influence on the movement of the piston rod 13 cannot be caused.

After the hydraulic oil in the working cavity 11 is pumped into the energy accumulator 3, the energy accumulator 3 is communicated with the oil outlet pipeline, the pressure inside the whole body is in the same size state, the internal hydraulic oil pressure P0 is gradually increased, and when the hydraulic oil pressure P0 is greater than the preset pressure value P1 of the first pressure valve 4, the hydraulic oil breaks through the first pressure valve 4 and flows to the hydraulic motor 6, the hydraulic motor 6 is driven to rotate and drive the generator 7 to generate electricity, and finally the electricity flows back to the oil tank 10. When the wave becomes larger, the hydraulic oil pressed into the energy accumulator 3 is increased, and because the parameters such as the pipe diameter, the length and the outlet of the oil outlet pipeline are fixed, the hydraulic oil pressure P0 in the oil outlet pipeline is gradually increased along with the increase of the pressed hydraulic oil, and when the hydraulic oil pressure P0 is greater than the preset pressure value P2 of the second pressure valve 8, the hydraulic oil breaks through the second pressure valve 8 and flows out of the overflow pipeline to release the pressure in the oil pipeline, so that the protection effect is achieved.

In a severe working condition, the floater 16 drives the piston rod 13 to move along with the increase of waves, the pressure of hydraulic oil in the energy accumulator 3 and the oil outlet pipeline is quickly increased, and when the pressure of the hydraulic oil reaches a pressure value in a preset working range, the switching component is started to enable the non-pressure cavity 12 to be communicated with the overload pipeline, so that a certain pressure is provided for the interior of the non-pressure cavity 12, and the floater 16 cannot move downwards;

when the severe working condition is recovered to the normal working condition, the switching assembly is started to enable the non-pressure cavity 12 to be communicated with the atmosphere pipeline, hydraulic oil in the non-pressure cavity 12 is discharged and recovered into the oil tank 10, and at the moment, the floater 16 is recovered to be in normal up-and-down floating along with waves.

In particular, in severe weather operating conditions, the float 16 moves the piston rod 13 due to the severe wave motion of the waves, so that the hydraulic oil pressure P0 in the accumulator 3 and the oil outlet line increases rapidly. Because the whole system needs to make corresponding setting to the working range of the internal pressure bearing when in design, if the wave fluctuation range is too large, the internal pressure bearing exceeds the preset working range, the switching component can be remotely controlled to switch the connecting pipeline of the non-pressure cavity 12. Specifically, the second switching valve 5 can be controlled through remote control to communicate the overload pipeline and the oil outlet pipeline, so that the overload pipeline shares hydraulic oil pressure in the oil outlet pipeline, and the first switching valve 9 can be triggered to switch the non-pressure cavity 12 to be connected with the overload pipeline due to overhigh hydraulic oil pressure, so that the non-pressure cavity 12 is communicated with the energy accumulator 3, and pressure released in the energy accumulator 3 becomes thrust for pushing the piston rod 13 to move upwards, so that the floater is lifted to a safe position.

When the normal working state needs to be restored, the switching component is controlled remotely to connect the non-pressure cavity 12 with the atmosphere pipeline, so that the hydraulic oil in the non-pressure cavity 12 is discharged through the atmosphere pipeline and is recycled into the oil tank 10, the pressure in the non-pressure cavity 12 is relieved, the float 16 is enabled to restore to move up and down freely and fall to the sea surface to float, and normal work is continued.

The utility model utilizes the hydraulic system to absorb the energy of the waves through the oscillating floater and utilizes the hydraulic conversion to generate the electric energy; meanwhile, under the condition of heavy waves, the oscillating floater is recovered and separated from the sea surface or locked, so that the oscillating floater is protected, the oscillating floater is prevented from being damaged due to severe oscillation in the heavy waves, and the sustainable operation is guaranteed in the development and utilization of ocean resources.

The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and to implement the present invention, which cannot limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.

Claims

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).