CN115385418A - A mobile seawater desalination device using wave energy - Google Patents

Abstract

The invention discloses a movable seawater desalination device utilizing wave energy. The wave energy mechanism of buoyancy swing type is connected with energy recovery mechanism through the hydraulic energy storage electricity generating mechanism, the desalination mechanism of reverse osmosis membrane sea water, wherein the buoyancy swing plate both sides contain protruding nodular structure, the swing plate arm rigid coupling buoyancy swing plate and install on base through the swing plate axle, the fluid cylinder articulates on buoyancy swing plate and base and connects with hydraulic motor and generator through the hydraulic control module, one end of the full wave rectifier circuit is communicated with hydraulic accumulator through the throttle valve, another end is communicated with oil tank through the overflow valve, the generator stretches the electrical machinery through the biax and drives the high-speed pump, the high-speed pump is connected with reverse osmosis membrane group through the sea water pretreatment unit, the weak and dense water that the reverse osmosis membrane group discharges enters the weak and dense water storage tank and energy recovery mechanism, the volute pump stretches the electrical machinery through the one-way clutch and biax and connects. The device can buffer wave energy, improve the quality of electric energy, realize continuous and stable wave energy conversion, enlarge the wave capture frequency range, increase the power generation time, and has simple structure and low failure rate.

Description

A mobile seawater desalination device using wave energy

technical field

The invention relates to a seawater desalination device in the technical field of water treatment, in particular to a movable seawater desalination device utilizing wave energy.

Background technique

Ocean wave energy, as a huge and largely untapped renewable energy, is ubiquitous in nature and has abundant reserves. Compared with other renewable energy sources, the energy intensity of ocean waves is high, and extracting ocean wave energy is a promising solution for renewable energy production with broad application prospects and important practical significance. However, the motion of waves in the marine environment has the characteristics of randomness and low frequency, which poses a challenge to the efficient collection and utilization of wave energy. Moreover, the current use of wave energy is mainly for power generation. At the same time, many islands in our country exist Facing the problem of fresh water shortage, the wave energy conversion device is used to convert the kinetic energy and potential energy of sea waves to generate electricity to drive the seawater desalination device to produce fresh water. This is not only the use of new renewable energy, but also a solution to the increasingly severe global water problem. try.

Desalination of seawater is considered to be one of the most promising technologies for supplying fresh water in water-scarce regions as it offers a way to produce high-quality water from seawater with lower energy consumption than other processes such as evaporation. Among them, reverse osmosis seawater desalination, that is, reverse osmosis membrane method, is one of the mainstream technologies of seawater desalination membrane method at present. The reverse osmosis membrane method has the advantages of short construction period, high degree of automation, modular installation, flexible scale selection, and low investment. advantage. Since electric energy is mainly used to drive the pump to pressurize the concentrated seawater, and the high-pressure seawater passes through the reverse osmosis membrane group to desalinate the seawater, the cost of fresh water obtained is relatively high, especially for the emergency water situation of island residents, how to make better use of renewable It is an urgent problem to be solved at present to produce fresh water from energy sources and provide certain protection for emergency situations of water shortage and power outage.

Contents of the invention

The purpose of the present invention is to enrich the application scenarios of existing seawater desalination devices. Aiming at the above problems, a movable seawater desalination device using wave energy is designed, which converts wave energy into electric energy and supplies high-speed pumps to drive reverse osmosis seawater. Dilution system.

The technical scheme provided by the invention is as follows:

The movable seawater desalination device includes a buoyancy swing wave energy mechanism, a hydraulic energy storage power generation mechanism, a reverse osmosis membrane seawater desalination mechanism and an energy recovery mechanism; the buoyancy swing wave energy mechanism and the hydraulic energy storage power generation mechanism are mechanically connected, and the hydraulic energy storage generates electricity The mechanism is electrically connected to the seawater desalination mechanism of the reverse osmosis membrane, and at the same time, the seawater desalination mechanism of the reverse osmosis membrane is mechanically connected to the energy recovery mechanism. The buoyancy swing wave energy mechanism is driven by the wave energy to drive the hydraulic energy storage power generation mechanism to generate electric energy, and the electric energy is input to the reverse osmosis. The membrane seawater desalination mechanism drives the reverse osmosis membrane seawater desalination mechanism to work, and realizes recovery and power generation through the energy recovery mechanism.

The buoyancy swing type wave energy mechanism includes a buoyancy pendulum plate, a sinusoidal raised nodule structure of the buoyancy pendulum plate, a pendulum plate arm, a pendulum plate shaft, a piston rod, a hydraulic cylinder and a base; the base is placed under the sea surface, and the pendulum plate arm One end is fixedly connected to the buoyant pendulum plate, the other end of the pendulum plate arm is hingedly mounted on one side of the base through the pendulum plate shaft, one end of the hydraulic cylinder is hinged to the buoyant pendulum plate, and the other end is hingedly mounted on the other side of the base;

The hydraulic energy storage power generation mechanism includes a hydraulic control module, a hydraulic motor and a generator all placed on the base; the two cylinder cavities of the hydraulic cylinder are connected to the hydraulic ports of the hydraulic control module and the hydraulic motor, and the output shaft of the hydraulic motor and The input shaft connection of the generator.

The hydraulic control module includes a full-wave rectification circuit, an oil tank, a relief valve, a throttle valve and a hydraulic accumulator; the full-wave rectification circuit is mainly composed of four one-way valves, specifically two one-way The valve is composed of two groups of one-way valve groups, each group of one-way valve groups is composed of two one-way valves connected in the same direction, and the two groups of one-way valve groups are connected in parallel in the same direction; the two cylinders of the hydraulic cylinder The cavities are respectively connected with the two check valves in the two sets of one-way valve groups of the full-wave rectification circuit. The other end of the one-way valve group connected in parallel is connected with the hydraulic accumulator through the throttle valve. At the same time, the other end of the two groups of one-way valve group connected in parallel in the full-wave rectification circuit is connected with the oil tank through the overflow valve. The inlet of the hydraulic motor It communicates with the hydraulic accumulator, and the outlet communicates with the oil tank.

The reverse osmosis membrane seawater desalination mechanism includes a high-speed pump without a gear box, a biaxial motor, a seawater pretreatment device, a reverse osmosis membrane group and a desalinated water storage tank; the electric input end of the biaxial motor and the hydraulic storage tank The electrical output end of the energy generating mechanism is connected, and one end of the output shaft of the biaxial extension motor is coaxially fixedly connected with the input shaft of the high-speed pump. The reverse osmosis membrane group has two outlets, the two outlets are respectively for discharging fresh water and high-pressure concentrated water, the outlet for discharging fresh water is connected to the desalinated water storage tank, and the outlet for discharging high-pressure concentrated water is connected to the energy recovery mechanism.

The energy recovery mechanism includes a one-way clutch and a vortex pump; the two hydraulic ports of the vortex pump are respectively connected to the outlet of the reverse osmosis membrane group to discharge high-pressure concentrated water and seawater, and the output shaft of the vortex pump is connected to the one-way clutch and the double-shaft extension motor. The other end of the output shaft is connected.

Compared with the prior art scheme, the present invention has the following beneficial effects:

1. The movable seawater desalination device utilizing wave energy proposed by the present invention converts the buoyant swinging wave energy device into mechanical energy and then into hydraulic energy through wave energy. Compared with the traditional smooth structure, it has better functions of reducing drag and delaying the separation stall, and can effectively use the shallow water effect in offshore sea areas, and the wave energy propagation direction is single, etc., which can better absorb wave energy and strengthen the pendulum plate The reciprocating swing improves the energy conversion efficiency. The hydraulic transmission system composed of hydraulic cylinders, hydraulic accumulators, check valve groups, throttle valves, overflow valves and hydraulic motors can better adapt to the random characteristics of wave energy changes, buffer wave energy, improve power quality, and realize Continuous and stable wave energy conversion. The pressure of the accumulator is always greater than the opening pressure under the condition of big waves, and the system can continue to generate electricity; while under the conditions of small waves, the generator generates electricity intermittently. The frequency range of wave capture is expanded, and the power generation time is increased, so that the device can realize pressure control only relying on system pipelines and components, with simple structure and low failure rate. Waves exert a lot of force at low speeds, hydraulic systems are great for absorbing energy in these conditions, and waves decay as they travel in shallow water, so they are less likely to be damaged in extreme conditions.

2. The seawater desalination module on land is integrated and installed, which is convenient to move to water-deficient residential areas, convenient and quick to install and arrange, and provides guarantee for emergency water supply. The near-shore seabed is close to the shore, which shortens the length of pipeline layout and reduces transmission loss. The reverse osmosis membrane separates the seawater into usable desalinated water, and the rest of the concentrated seawater is still in a high-pressure state. The vortex pump is used as an energy recovery device to recover part of the residual pressure and assist the drive motor to reduce energy loss. Moreover, the structure of the vortex pump is simple, easy to maintain, and the operation arrangement is relatively flexible.

Description of drawings

Fig. 1 is the buoyancy pendulum plate containing raised nodules structure of the present invention;

Fig. 2 is the buoyancy swing type wave energy device of the present invention;

Fig. 3 is the hydraulic energy storage power generation device of the present invention;

Fig. 4 is the movable reverse osmosis seawater desalination device of the present invention.

In the figure, 1 is the sinusoidal raised nodular structure of the buoyant pendulum plate; 2 is the buoyant pendulum plate; 3 is the pendulum plate arm; 4 is the pendulum plate shaft; 5 is the piston rod; 6 is the hydraulic cylinder; 7 is the base; 8 is the Hydraulic control module; 9 is hydraulic motor; 10 is generator; 11 is one-way valve; 12 is oil tank; 13 is overflow valve; 14 is throttle valve; 15 is hydraulic accumulator; 16 is without gearbox 17 is a double-shaft motor; 18 is a one-way clutch; 19 is a vortex pump; 20 is a seawater pretreatment device; 21 is a reverse osmosis membrane group; 22 is a desalinated water storage tank.

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

Referring to Figures 1 to 4, a mobile reverse osmosis seawater desalination device using wave energy in an embodiment provided by the present invention includes a buoyancy swing wave energy mechanism, a hydraulic energy storage power generation mechanism, and a reverse osmosis membrane seawater desalination device. mechanism and energy recovery mechanism; the buoyancy swing wave energy mechanism is mechanically connected to the hydraulic energy storage power generation mechanism, the hydraulic energy storage power generation mechanism is electrically connected to the reverse osmosis membrane seawater desalination mechanism, and the reverse osmosis membrane seawater desalination mechanism is mechanically connected to the energy recovery mechanism, The buoyancy swing wave energy mechanism is driven by the wave energy to drive the hydraulic energy storage power generation mechanism to generate electricity, and the electric energy is input into the reverse osmosis membrane seawater desalination mechanism to drive the reverse osmosis membrane seawater desalination mechanism to work, and the energy recovery mechanism realizes recovery and power generation.

Both the buoyancy swing wave energy device and the hydraulic energy storage power generation device are arranged on the seabed near the coast, and the reverse osmosis seawater desalination device and the energy recovery device are both arranged on the coastal land.

As shown in Figure 2, the buoyancy swing wave energy mechanism includes a buoyancy pendulum plate 2, a sinusoidal raised nodule structure 1 of the buoyancy pendulum plate 2, a pendulum plate arm 3, a pendulum plate shaft 4, a piston rod 5, a hydraulic cylinder 6 and a base 7. The base 7 is placed under the sea surface, one end of the pendulum arm 3 is fixedly connected to the buoyant pendulum plate 2, the two sides of the buoyant pendulum plate 2 are provided with sinusoidal raised nodule structures 1, and the other end of the pendulum plate arm 3 is hinged through the pendulum plate shaft 4 Installed on one side of the base 7, one end of the hydraulic cylinder 6 is hinged on the buoyancy pendulum plate 2, and the other end is hinged on the other side of the base 7; the pendulum plate of the buoyancy pendulum is a hollow plate-shaped body, and the pendulum plate has two A swing plate arm has a main shaft of the swing plate on the swing plate arm and a piston rod support on the swing plate body. The piston rod is connected to the buoyancy pendulum through the shaft, and the piston rod can move back and forth in the hydraulic cylinder. The base is fixed on the seabed near the coast. Together.

As shown in Figure 1, the sinusoidal raised nodule structures 1 on both sides of the buoyant pendulum plate 2 are sinusoidal, similar to the raised nodules distributed at the leading edge of the pectoral fins of humpback whales. Compared with the traditional smooth The structure has better functions of reducing drag and delaying separation stall. Inspired by this "nodule effect", the present invention applies the sinusoidal raised nodule structure to the buoyancy pendulum plate. Compared with the traditional smooth structure, this structure has better effects of reducing drag and delaying separation stall, and can Effective use of the shallow water effect of the offshore sea area and the single direction of wave energy propagation can better absorb wave energy, enhance the reciprocating swing of the pendulum plate, and improve energy conversion efficiency.

The buoyancy pendulum is formed by the buoyancy pendulum 2 and the pendulum arm 3. The buoyancy pendulum is hinged and installed on the base 7 through the pendulum plate shaft 4. The hydraulic cylinder 6 is connected to the buoyancy pendulum plate through the piston rod 5, and the hydraulic cylinder 6 is connected to the buoyancy pendulum through the hydraulic cylinder. To the hydraulic cylinder support of the base, the base is installed on the seabed close to the shore, and the installation site belongs to the shallow water propulsion wave area.

The top of the buoyant pendulum is better below the mean sea surface, and when there is no wave, the buoyant pendulum relies on buoyancy to be perpendicular to the seabed. Under the action of external force, the buoyant pendulum can swing around the pendulum shaft 4. When the buoyant pendulum swings, the piston rod 5 drives the piston to reciprocate in the hydraulic cylinder 6 .

The hydraulic energy storage power generation mechanism includes a hydraulic control module 8, a hydraulic motor 9 and a generator 10 all placed on the base 7; the two cylinder chambers of the hydraulic cylinder 6 are connected through the hydraulic ports of the hydraulic control module 8 and the hydraulic motor 9, and the hydraulic motor The output shaft of 9 is connected with the input shaft of generator 10.

A hydraulic control module 8 , a hydraulic motor 9 and a generator 10 are installed on the base 7 . Both ends of the hydraulic cylinder 6 have pipelines leading to the hydraulic control module, and the hydraulic control module has pipelines connected to the hydraulic motor.

As shown in Figure 3, the hydraulic control module 8 includes a full-wave rectification circuit, an oil tank 12, an overflow valve 13, a throttle valve 14 and a hydraulic accumulator 15; the full-wave rectification circuit is mainly composed of four one-way valves 11 connected, Specifically, two one-way valves 11 are formed into two groups of one-way valve groups. Each group of one-way valve groups is composed of two one-way valves 11 connected in the same direction, and two groups of one-way valve groups are connected in parallel in the same direction; In specific implementation, the two cylinder cavities of the hydraulic cylinder 6 are divided into a rod cavity and a rodless cavity, and the two cylinder cavities of the hydraulic cylinder 6 are respectively connected with the two check valves 11 In the full-wave rectification circuit, one end of two groups of one-way valve groups connected in parallel is connected with the fuel tank 12, and the other end of the full-wave rectification circuit after two groups of one-way valve groups are connected in parallel passes through the throttle valve 14 and hydraulic energy storage. At the same time, the other end of the two sets of one-way valves connected in parallel in the full-wave rectification circuit communicates with the fuel tank 12 through the overflow valve 13, the inlet of the hydraulic motor 9 communicates with the hydraulic accumulator 15, and the outlet communicates with the fuel tank 12.

Usually in the case of shallow water, the water under the sea surface driven by the shallow water forward wave is reciprocating mainly in the horizontal direction. In this way, the buoyancy pendulum swings reciprocatingly with the waves, and a clutch can be set between the hydraulic cylinder and the hydraulic cylinder support. , to allow the hydraulic cylinder to be removed from it. In this way, the buoyant pendulum under the sea surface will swing back and forth with the water, and the mechanical energy of the swing is converted into rotational mechanical energy through the hydraulic system. The buoyant pendulum swings back and forth to drive the piston to move back and forth in the hydraulic cylinder, and the hydraulic oil flows back and forth in the two cylinder chambers of the hydraulic cylinder. , the present invention forms four one-way valves 11 into a full-wave rectification circuit to rectify the hydraulic oil flowing back and forth into oil flowing in one direction.

The rectified oil drives the hydraulic motor 9 to rotate through the throttle valve 14, and the hydraulic motor 9 drives the generator 10 to generate electricity. The throttle valve 14 is controlled to adjust the rotating speed of the hydraulic motor 9, and the hydraulic accumulator 15 filters the fluctuating oil pressure gently like a capacitor in the circuit, so that the hydraulic motor rotates evenly. The hydraulic motor has variable capacity to drive the generator at a near constant speed with variable flow.

If the output oil pressure of the big wave hydraulic cylinder is too high, the excess oil will be emptied and returned to the oil tank 12 through the overflow valve 13 . After working for a period of time, if the pressure of the hydraulic accumulator 15 no longer satisfies the condition for opening the directional valve, then stop generating electricity. Therefore, under the condition of big waves, the pressure of the hydraulic accumulator 15 is always greater than the opening pressure, and then the power generation can be continued; while under the condition of small waves, the generator generates power intermittently. The use of the hydraulic control module 8 expands the frequency range of wave capture. In addition, the hydraulic accumulator 15 provides less boost pressure to the low pressure accumulator to reduce the risk of cavitation on the low pressure side, and the hydraulic accumulator 15 smoothes the flow when driven by a variable capacity motor.

Fuel tank, check valve, relief valve, throttle valve, hydraulic accumulator are all placed in hydraulic control module 8, and hydraulic motor and generator are then placed on the base.

A hydraulic accumulator is an energy storage device in a hydraulic transmission system. It converts the energy in the system into compression energy or potential energy at an appropriate time and stores it. When the system needs it, it converts the compression energy or potential energy into hydraulic energy and releases it to supply the system again. When the pressure of the system increases instantaneously, it can absorb this part of the energy to ensure the normal pressure of the whole system.

The hydraulic motor is an actuator of the hydraulic system, which converts the hydraulic pressure energy provided by the hydraulic pump into the mechanical energy (torque and speed) of its output shaft. Liquids are media that transmit force and motion. The high-pressure oil stored in the high-pressure oil tank is supplied to the hydraulic motor, which converts the energy in the high-pressure oil into mechanical energy, and then drives the generator to provide electric energy to drive the high-speed pump to pump seawater and pressurize it to the reverse osmosis seawater desalination device.

As shown in Figure 4, the reverse osmosis membrane seawater desalination mechanism includes a high-speed pump 16 without a gearbox, a biaxial extension motor 17, a seawater pretreatment device 20, a reverse osmosis membrane group 21 and a desalinated water storage tank 22;

The electric input end of the biaxial extension motor 17 is connected with the electric output end of the generator 10 of the hydraulic energy storage generating mechanism, and one end of the output shaft of the biaxial extension motor 17 is coaxially fixedly connected with the input shaft of the high-speed pump 16, and the high-speed pump 16 The inlet is connected to the seawater, and the outlet of the high-speed pump 16 is connected to the inlet of the seawater pretreatment device 20 and the reverse osmosis membrane group 21. The reverse osmosis membrane group 21 has two outlets. The outlet of the desalinated water storage tank 22 is connected, and the outlet of the high-pressure concentrated water is connected to the energy recovery mechanism;

The energy recovery mechanism includes a one-way clutch 18 and a vortex pump 19; the vortex pump 19 works in reverse. Connect through the one-way clutch 18 and the other end of the output shaft of the double shaft extension motor 17.

In the reverse osmosis membrane seawater desalination device, the high-speed pump pumps seawater into the seawater desalination system through the water intake pipe to a certain high pressure to ensure that the pretreated raw water pressure can reach the required working pressure of the reverse osmosis membrane group. The function of the filter reaction device is to pretreat the raw seawater. The raw seawater used in reverse osmosis seawater desalination needs to be pretreated to remove impurities such as mud particles, suspended solids, colloids, algae, and microorganisms in the seawater. The quality of seawater after pretreatment The water quality requirements of the reverse osmosis membrane should be met to ensure the safe and stable operation of the desalination device. The desalinated water obtained after the seawater is desalinated by the reverse osmosis membrane group is stored in the water storage tank for use.

The energy recovery device uses the reverse rotation of the vortex pump as a turbine to recover energy. The concentrated seawater treated by the reverse osmosis membrane group is still high-pressure concentrated seawater, and there is still residual pressure. The high-pressure concentrated seawater is transported to the inlet of the vortex pump through the pipeline. When flowing through the impeller, the fluid impacts the blades, pushing the impeller to rotate, and the rotating shaft outputs mechanical work. The reverse rotation of the vortex pump as the turbine is used as the auxiliary prime mover and the motor as the main prime mover is connected in series to jointly drive the high-speed pump. Before the turbine of the vortex pump is repaired or the fluid pipeline of the vortex pump turbine is connected, the driven high-speed pump can run normally. Second, if the flow to the vortex pump may vary greatly or frequently, when the flow drops to about 40% of the rated flow, the hydraulic turbine will stop outputting power and will damp the main drive.

Furthermore, the high-speed pump 16 without a gearbox is connected to the double-shaft motor 17 through a coupling, and the motor drives the high-speed pump to send seawater into the reverse osmosis seawater desalination system through the water inlet pipe, and first enter the seawater pretreatment device 20 for pretreatment , including: flocculation, sterilization, precipitation, filtration, etc., to remove turbidity, various types of organic compounds, chroma, and bacteria in water, thereby alleviating the problems of membrane clogging and membrane fouling, reducing the number of membrane cleanings, and ensuring anti-corrosion The osmotic membrane group is continuously supplied with water. The pretreated raw water can meet the influent requirements of the reverse osmosis membrane group 21, with a turbidity of ≤1NTU and a pollution index of SDI ₁₅ ≤5. The reverse osmosis membrane desalinates the raw water into desalinated water and concentrated water, and the desalinated water is transported to the desalinated water In the water storage tank 22, it is stored for use.

Further, the concentrated water produced after separation still has a pressure of about 5MPa, and the high-pressure concentrated water is transported to the hydraulic turbine energy recovery device through a pipeline: the vortex pump 19, and the concentrated water enters the vortex pump to reverse the vortex pump for turbine operation, When the concentrated water flows through the impeller, it impacts the blades, drives the impeller to rotate, and the rotating shaft outputs mechanical work. The vortex pump 19 is used for turbine energy recovery as the auxiliary prime mover and the double-shaft extension motor 17 as the main prime mover is connected in series to jointly drive the high-speed pump, and a one-way clutch 18 is set between the motor and the vortex pump. Before the maintenance of the turbine or the fluid pipeline of the scroll pump turbine is connected, the driven high-speed pump can run normally. Second, if the flow to the vortex pump may vary greatly or frequently, when the flow drops to about 40% of the rated flow, the hydraulic turbine will stop outputting power and will damp the main drive. Recover part of the energy through the energy recovery device, increase the energy utilization rate, and achieve the purpose of energy saving.

In the mobile seawater desalination device using wave energy proposed in this implementation, the buoyancy swing wave energy device drives the hydraulic motor through the hydraulic transmission system to rotate and drive the generator to generate electricity for the biaxial extension motor, and the energy recovery device recovers part of the energy of the concentrated water to assist Drive the double shaft extension motor. Energy recovery device: The vortex pump acts as an auxiliary prime mover and a double-shaft extension motor in series to jointly drive a high-speed pump without a gearbox. The use of renewable energy wave energy and the recovery of concentrated water residual pressure form an effective reduction in fresh water production. The cost will further provide an additional guarantee for residents' emergency water use.

The described embodiment is a preferred implementation of the present invention, but the present invention is not limited to the above-mentioned implementation, without departing from the essence of the present invention, any obvious improvement, replacement or modification that those skilled in the art can make Modifications all belong to the protection scope of the present invention.

Claims (5)

1. A movable seawater desalination device utilizing wave energy, characterized in that: Including buoyancy swing type wave energy mechanism, hydraulic energy storage power generation mechanism, reverse osmosis membrane seawater desalination mechanism and energy recovery mechanism; buoyancy swing type wave energy mechanism and hydraulic energy storage power generation mechanism are mechanically connected, hydraulic energy storage power generation mechanism and reverse osmosis membrane seawater The desalination mechanism is electrically connected, and the reverse osmosis membrane seawater desalination mechanism is mechanically connected with the energy recovery mechanism. The buoyancy swing wave energy mechanism is driven by the wave energy to drive the hydraulic energy storage power generation mechanism to generate electric energy, and the electric energy is input to the reverse osmosis membrane seawater desalination mechanism to drive The reverse osmosis membrane seawater desalination mechanism works, and the energy recovery mechanism realizes recovery and power generation. 2. A mobile seawater desalination device utilizing wave energy according to claim 1, characterized in that: said buoyancy swing type wave energy mechanism comprises a buoyancy pendulum (2), a buoyancy pendulum (2) The sinusoidal raised nodule structure (1), the swing plate arm (3), the swing plate shaft (4), the piston rod (5), the hydraulic cylinder (6) and the base (7); the base (7) is placed under the sea surface, One end of the pendulum arm (3) is fixedly connected to the buoyancy pendulum plate (2), the two sides of the buoyancy pendulum plate (2) are provided with sinusoidal raised nodule structures (1), and the other end of the pendulum plate arm (3) passes through the pendulum plate shaft ( 4) Hingedly installed on one side of the base (7), one end of the hydraulic cylinder (6) is hinged on the buoyancy pendulum (2), and the other end is hingedly installed on the other side of the base (7); The hydraulic energy storage power generation mechanism includes a hydraulic control module (8), a hydraulic motor (9) and a generator (10) all placed on the base (7); the two cylinder chambers of the hydraulic cylinder (6) are hydraulically controlled The module (8) is connected to the hydraulic port of the hydraulic motor (9), and the output shaft of the hydraulic motor (9) is connected to the input shaft of the generator (10). 3. A mobile seawater desalination device utilizing wave energy according to claim 1, characterized in that: the hydraulic control module (8) includes a full-wave rectification circuit, an oil tank (12), an overflow valve ( 13), throttling valve (14) and hydraulic accumulator (15); described full-wave rectification circuit mainly is formed by four one-way valves (11) connection, is specifically formed by two one-way valves (11) Two groups of one-way valve groups are formed, and each group of one-way valve groups is formed by connecting two one-way valves (11) in the same direction, and two groups of one-way valve groups are connected in parallel in the same direction; the hydraulic cylinder (6) The two cylinder cavities communicate with the two check valves (11) in the two sets of one-way valve groups of the full-wave rectification circuit respectively, and one end of the two sets of one-way valve groups connected in parallel in the full-wave rectification circuit is connected to the oil tank (12 ) connected, the other end of the two groups of one-way valve groups connected in parallel in the full-wave rectification circuit is connected with the hydraulic accumulator (15) through the throttle valve (14), and at the same time, after the two groups of one-way valve groups connected in parallel in the full-wave rectification circuit The other end of the valve is communicated with the oil tank (12) through the overflow valve (13), the inlet of the hydraulic motor (9) is communicated with the hydraulic accumulator (15), and the outlet is communicated with the oil tank (12). 4. A mobile seawater desalination device utilizing wave energy according to claim 1, characterized in that: said reverse osmosis membrane seawater desalination mechanism comprises a high-speed pump (16) without a gear box, a biaxial extension Motor (17), seawater pretreatment device (20), reverse osmosis membrane group (21) and desalinated water storage tank (22); the electric input end of biaxial motor (17) and the electric output of hydraulic energy storage generating mechanism One end of the output shaft of the double-shaft extension motor (17) is coaxially fixedly connected with the input shaft of the high-speed pump (16), the inlet of the high-speed pump (16) is connected with seawater, and the outlet of the high-speed pump (16) is pretreated by seawater The device (20) is connected to the inlet of the reverse osmosis membrane group (21), and the reverse osmosis membrane group (21) has two outlets, the two outlets are respectively for discharging fresh water and high-pressure concentrated water, and the outlet for discharging fresh water is connected to the desalinated water storage tank (22), the outlet for discharging the high-pressure concentrated water is connected to the energy recovery mechanism. 5. A mobile seawater desalination device utilizing wave energy according to claim 4, characterized in that: said energy recovery mechanism comprises a one-way clutch (18), a vortex pump (19); a vortex pump (19 ) are respectively connected to the outlet of the reverse osmosis membrane group (21) to discharge high-pressure concentrated water and seawater, and the output shaft of the vortex pump (19) passes through the output shaft of the one-way clutch (18) and the double-shaft extension motor (17). Connect the other end.

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