A seawater desalination system

Abstract

The present invention relates to the technical field of seawater desalination, and in particular to a seawater desalination system. The seawater desalination system includes a wave energy collection device, a hydraulic cylinder, and seawater desalination equipment. The wave energy collection device includes a float, a connecting rod, a support rod, and a piston. The first end of the connecting rod is connected to the float, the second end of the connecting rod is connected to the piston, and the connecting rod and the support rod are rotatably connected to form a lever structure. The hydraulic cylinder includes a diaphragm structure, a first opening, a second opening, and a third opening. The hydraulic cylinder is divided into a hydraulic oil area and a seawater area by the diaphragm structure. The first opening is opened in the hydraulic oil area, the piston is set at the first opening, and the second opening and the third opening are opened in the seawater area. The seawater desalination equipment is connected to the seawater area through the second opening and the third opening. With this design, the wave energy collected by the wave energy collection device is directly converted into the hydraulic energy of the hydraulic oil in the hydraulic oil area, and is directly used for the transportation of seawater in the seawater desalination equipment, thereby improving the energy conversion efficiency and avoiding energy waste.

Description

Technical Field

[0001] The present invention relates to the technical field of seawater desalination, and in particular to a seawater desalination system. Background Art

[0002] Freshwater resources are fundamental to industrial, agricultural, and urban development. Currently, many countries and regions face freshwater shortages. Seawater accounts for over 97% of the Earth's total water resources. Desalination systems remove salt and other impurities from seawater to produce freshwater, effectively alleviating this shortage.

[0003] However, currently, the transportation of seawater in the desalination system is often achieved through the conversion of electrical energy, such as electric high-pressure pumps, water pumps and other devices, but the energy conversion efficiency is low, resulting in energy waste. Summary of the Invention

[0004] In order to overcome the problems existing in the related art, the present invention provides a seawater desalination system that can reduce the energy conversion steps and improve the energy conversion efficiency.

[0005] According to some embodiments, a seawater desalination system is provided, comprising:

[0006] A wave energy harvesting device includes a float, a connecting rod, a support rod, and a piston, wherein a first end of the connecting rod is connected to the float, a second end of the connecting rod is connected to the piston, and the connecting rod and the support rod are rotatably connected to form a lever structure;

[0007] A hydraulic cylinder comprising a diaphragm structure, a first opening, a second opening, and a third opening, wherein the hydraulic cylinder is divided into a hydraulic oil area and a seawater area by the diaphragm structure, the first opening being located in the hydraulic oil area, the piston being disposed at the first opening, and the second opening and the third opening being located in the seawater area;

[0008] a seawater desalination device, the seawater desalination device being in communication with the seawater area through the second opening and the third opening;

[0009] The hydraulic cylinder is used to convert the wave energy collected by the wave energy collection device into hydraulic energy for use in transporting seawater in the seawater desalination equipment.

[0010] In some embodiments of the present invention, the first end of the support rod is rotatably connected to the first position of the connecting rod to form a fulcrum, and the second end of the support rod is arranged on the inclined coast; the power arm on the float side is larger than the resistance arm on the piston side.

[0011] In some embodiments of the present invention, the seawater desalination system further comprises a position regulating device, the position regulating device being arranged obliquely along the coast, and the position regulating device being used to regulate the position of the float according to changes in tide level;

[0012] The position adjustment device includes a float, a screw rod, a slider, a liquid level sensor and a brake mechanism, wherein:

[0013] The slider is threadedly connected to the screw rod, the support rod is fixed to the slider, the buoyancy box is fixed to the slider and is located at the end of the slider close to the seawater, and the buoyancy box is provided with the liquid level sensor, which is used to detect changes in tide level;

[0014] The braking mechanism is fixedly connected to the screw rod, and the braking mechanism is electrically connected to the liquid level sensor.

[0015] In some embodiments of the present invention, the braking mechanism includes a motor, a transmission assembly, a rotating ring and a braking ring, wherein:

[0016] The transmission assembly includes a plurality of elastic brake pins, and the output end of the motor is connected to the transmission assembly to drive the plurality of elastic brake pins to extend and retract synchronously;

[0017] The rotating ring is fixedly connected to the screw rod so as to rotate synchronously with the screw rod, the brake ring is coaxially arranged with the rotating ring, and the brake ring is fixedly arranged in the brake mechanism. A plurality of first through holes are evenly opened on the side wall of the rotating ring, and a plurality of second through holes are evenly opened on the side wall of the brake ring. The number of the elastic brake pin, the first through hole and the second through hole is equal, and the shapes of the first through hole and the second through hole are adapted to the shape of the elastic brake pin for the elastic brake pin to pass through.

[0018] In some embodiments of the present invention, the transmission assembly further includes a fixed portion, a rotating portion, and a plurality of limiting pipes, wherein the fixed portion and the rotating portion are both cylindrical structures and are stacked along the axial direction of the fixed portion, and the rotating portion is connected to the output end of the motor;

[0019] The rotating part is provided with a plurality of arc-shaped through holes, the fixed part is provided with a plurality of linear grooves correspondingly along the radial direction, the plurality of limiting pipes are fixedly connected to the outer wall of the fixed part, and the plurality of limiting pipes are respectively communicated with the plurality of linear grooves;

[0020] The elastic brake pin includes a limiting protrusion, a connecting section, a spring and a braking section, wherein the limiting protrusion is provided on the connecting section, and the spring connects the connecting section and the braking section;

[0021] When the motor drives the rotating part to rotate, the limiting protrusion slides in the arc-shaped through hole, driving the connecting section, the spring and the braking section to move in the straight groove and the limiting pipe. The braking section is used to pass through the first through hole and the second through hole to achieve braking of the rotating ring.

[0022] In some embodiments of the present invention, a channel is provided inside the buoyancy box, the channel comprising a seawater inlet provided on the side of the buoyancy box and an atmosphere communication port provided on the top surface of the buoyancy box, the channel communicating seawater and air;

[0023] The liquid level sensor is arranged in the channel, and includes a first liquid level sensor, a second liquid level sensor, and a third liquid level sensor arranged in sequence from top to bottom in a vertical direction, the first liquid level sensor and the second liquid level sensor are separated by a first preset distance, and the second liquid level sensor and the third liquid level sensor are separated by a second preset distance;

[0024] The initial tide level is at the second liquid level sensor,

[0025] When the first liquid level sensor continuously detects seawater within a set time period, the motor drives the rotating part to rotate so that the elastic brake pin retracts, the braking mode is turned off, and the buoyancy chamber rises under the action of buoyancy. When the second liquid level sensor no longer detects seawater, the motor drives the rotating part to rotate so that the elastic brake pin extends, and the braking mode is turned on.

[0026] When the third liquid level sensor continuously fails to detect seawater within a set time period, the motor drives the rotating part to rotate so that the elastic brake pin retracts, the braking mode is turned off, and the buoyancy tank descends under the action of gravity until the second liquid level sensor detects seawater. Then the motor drives the rotating part to rotate so that the elastic brake pin extends, and the braking mode is turned on.

[0027] In some embodiments of the present invention, the diaphragm structure includes a first diaphragm, a second diaphragm and a connecting rod, wherein the first diaphragm is arranged in the hydraulic oil area, the second diaphragm is arranged in the seawater area, the first diaphragm and the second diaphragm are both fixedly connected to the inner wall of the hydraulic cylinder, and the connecting rod is arranged at the axial position of the hydraulic cylinder and connects the first diaphragm and the second diaphragm.

[0028] In some embodiments of the present invention, the hydraulic oil area is further provided with a fourth opening, the hydraulic oil storage device is connected to the hydraulic oil area through the fourth opening, a valve is provided at the fourth opening, and the hydraulic cylinder also includes a displacement sensor, which is used to detect the displacement of the first diaphragm. The displacement sensor is electrically connected to the valve to control the replenishment and discharge of the hydraulic oil in the hydraulic oil area.

[0029] In some embodiments of the present invention, the seawater desalination equipment is arranged underground at the coast, and the seawater desalination equipment includes a first pipeline, a pretreatment device, a second pipeline, a third pipeline and a membrane desalination device arranged in sequence along the flow direction of seawater;

[0030] The pretreatment device is connected to the seawater through the first pipe, the second pipe connects the pretreatment device and the second opening, the third pipe connects the third opening and the membrane desalination device, and the membrane desalination device is provided with a brine drain outlet and a fresh water drain outlet respectively.

[0031] In some embodiments of the present invention, a first valve is provided on the second pipeline, a second valve is provided on the third pipeline, and both the first valve and the second valve are electrically connected to the displacement sensor;

[0032] When the displacement sensor detects that the first diaphragm moves toward the hydraulic oil area, the first valve opens and the second valve closes; when the displacement sensor detects that the first diaphragm moves toward the seawater area, the first valve closes and the second valve opens.

[0033] The technical solutions provided by the embodiments of the present invention may have the following beneficial effects:

[0034] The present invention provides a seawater desalination system, which is provided with a wave energy collection device having a lever structure and a hydraulic cylinder connecting the wave energy collection device and the seawater desalination equipment. The movement of a float under the action of waves drives a piston to move at a first opening of the hydraulic cylinder, and the wave energy is converted into hydraulic energy of the hydraulic oil in the hydraulic oil area through the movement of the float. The hydraulic energy acts on the seawater area through a diaphragm structure and is directly used for transporting seawater in the seawater desalination equipment, thereby simplifying the energy conversion steps and improving the energy conversion efficiency.

[0035] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0037] Figure 1 is a schematic diagram of the three-dimensional structure of a seawater desalination system according to an exemplary embodiment;

[0038] Figure 2 is a structural schematic diagram of a seawater desalination system according to an exemplary embodiment;

[0039] Figure 3 is a structural schematic diagram of a position adjustment device according to an exemplary embodiment;

[0040] Figure 4 is a structural schematic diagram of a braking mechanism when a braking mode is turned on according to an exemplary embodiment;

[0041] Figure 5 is a schematic structural diagram of a braking mechanism when the braking mode is turned off according to an exemplary embodiment;

[0042] Figure 6 It is a schematic structural diagram of a hydraulic cylinder according to an exemplary embodiment.

[0043] Reference numerals:

[0044] 10. Seawater;

[0045] 100. Wave energy harvesting device; 110. Float; 120. Connecting rod; 130. Piston; 1310. Piston rod; 140. Support rod;

[0046] 200, hydraulic cylinder; 210, diaphragm structure; 2110, first diaphragm; 2120, second diaphragm; 2130, connecting rod; 220, first opening; 230, second opening; 240, third opening; 250, fourth opening; 260, hydraulic oil area; 270, seawater area; 280, displacement sensor;

[0047] 300, position adjustment device; 310, buoyancy tank; 3110, seawater inlet; 3120, atmosphere communication port; 3130, channel; 320, screw rod; 330, slider; 340, liquid level sensor; 3410, first liquid level sensor; 3420, second liquid level sensor; 3430, third liquid level sensor; 350, braking mechanism; 3511, fixing portion; 3512, rotating portion; 3513, limiting conduit; 3514, linear groove; 3515, arc-shaped through hole; 3520, elastic braking pin; 3521, limiting protrusion; 3522, connecting section; 3523, spring; 3524, braking section; 3530, rotating ring; 3531, first through hole; 3540, braking ring; 3541, second through hole;

[0048] 410, first pipeline; 420, second pipeline; 4210, first valve; 430, third pipeline; 4310, second valve; 440, pretreatment device; 450, membrane desalination device; 4510, brine drain outlet; 4520, fresh water drain outlet. DETAILED DESCRIPTION

[0049] Exemplary embodiments will be described in detail herein, examples of which are illustrated in the accompanying drawings. In the following description, when referring to the drawings, like numbers in different figures represent like or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all possible embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present invention, as detailed in the appended claims.

[0050] Freshwater resources are fundamental to the development of various industries. Currently, many countries and regions face freshwater shortages. Seawater accounts for over 97% of the Earth's total water resources. Desalination systems remove salt and other impurities from seawater to produce freshwater, effectively alleviating this shortage. However, current methods of transporting seawater within desalination systems often rely on electrical energy conversion, such as through electric high-pressure pumps and water pumps, resulting in wasted energy.

[0051] In order to solve the above technical problems, the present invention provides a seawater desalination system, which is provided with a wave energy collection device with a lever structure and a hydraulic cylinder connecting the wave energy collection device and the seawater desalination equipment. The movement of the float under the action of waves drives the piston to move at the first opening of the hydraulic cylinder, and the wave energy is converted into hydraulic energy of the hydraulic oil in the hydraulic oil area through the movement of the float. The hydraulic energy acts on the seawater area through the diaphragm structure and is directly used for the transportation of seawater in the seawater desalination equipment, thereby fully utilizing the wave energy, saving electricity, and improving the energy conversion efficiency.

[0052] A seawater desalination system according to the present invention is described in detail below with reference to the accompanying drawings.

[0053] It should be noted that Figures 2 to 3 The x-axis direction is the horizontal direction, Figure 1 The plane where the x-axis and z-axis are located is the direction of sea level. Figures 1 to 3 The y-axis is the vertical direction; Figures 4 to 6 The coordinate axis direction in is only used to describe the orientation relationship. Figures 1 to 3 The directions of the coordinate axes in can be the same or different and have no limiting effect.

[0054] The embodiment of the present invention provides a seawater desalination system, such as Figure 1 、 Figure 2 and Figure 6 As shown, the seawater desalination system includes a wave energy harvesting device 100, a hydraulic cylinder 200 and a seawater desalination device, wherein the wave energy harvesting device 100 includes a float 110, a connecting rod 120, a support rod 140 and a piston 130, the support rod 140 extends along the y-axis direction, and the support rod 140 is rotatably connected to the middle section of the connecting rod 120 to form a lever structure, the first end of the connecting rod 120 is connected to the float 110, and the float 110 moves under the action of waves, serving as the power of the lever structure, the second end of the connecting rod 120 is hinged to the first end of the piston rod 1310, and the second end of the piston rod 1310 is fixedly connected to the piston 130, and the piston 130 moves in the piston pipe, and the piston pipe is connected to the first opening 220 of the hydraulic cylinder 200, serving as the resistance of the lever structure. The movement of the piston can do work on the hydraulic oil in the hydraulic oil area; the hydraulic cylinder 200 connects the wave energy harvesting device 100 and the seawater desalination device, with reference to FIG. Figure 6 Hydraulic cylinder 200 includes a diaphragm structure 210, a first opening 220, a second opening 230, and a third opening 240. Diaphragm structure 210 is located in the middle section of hydraulic cylinder 200, dividing hydraulic cylinder 200 into a hydraulic oil region 260 and a seawater region 270. First opening 220 is located in hydraulic oil region 260, while second opening 230 and third opening 240 are located in seawater region 270. The seawater desalination equipment communicates with the seawater region 270 of hydraulic cylinder 200 through second opening 230 and third opening 240. Hydraulic cylinder 200 converts wave energy collected by wave energy harvesting device 100 into hydraulic energy for transporting seawater in the desalination equipment.

[0055] The float 110 in this embodiment is a cylindrical structure with its axis extending along the z-axis direction. In other embodiments, the float 110 can also be configured as a sphere or other shapes, which are not limited here.

[0056] The seawater desalination system in this embodiment operates as follows: the float 110 is located in the seawater 10 and moves under the action of waves. The lever structure drives the piston 130 to move at the first opening 220 of the hydraulic cylinder 200, performing work on the hydraulic oil in the hydraulic oil area 260, converting wave energy into hydraulic energy; the hydraulic oil acts on the seawater area 270 through the deformation of the diaphragm structure 210, completing the pumping and release of seawater in the seawater area 270, that is, realizing the transportation of seawater in the seawater desalination equipment, and the seawater is desalinated during the transportation process.

[0057] By providing a wave energy harvesting device 100 with a lever structure and a hydraulic cylinder 200 connecting the wave energy harvesting device 100 and the seawater desalination equipment, the movement of the float 110 under the action of waves drives the piston 130 to move at the first opening 220 of the hydraulic cylinder 200, thereby converting the wave energy into hydraulic energy of the hydraulic oil in the hydraulic oil area 260 through the movement of the float 110. This hydraulic energy acts on the seawater area 270 through the diaphragm structure 210 and is directly used to transport seawater in the seawater desalination equipment. The wave energy is directly used as the power for seawater transportation, without the need for electrical energy conversion, which simplifies the energy conversion steps and improves the energy conversion efficiency.

[0058] In one embodiment, if Figure 2 As shown, the first end of the support rod 140 is rotatably connected to the first position of the connecting rod 120 to form a fulcrum, and the second end of the support rod 140 is set on the inclined coast. The power arm on the side of the float 110 is larger than the resistance arm on the side of the piston 130, that is, the fulcrum is set closer to the side of the piston 130.

[0059] Since the power arm is larger than the resistance arm, according to the principle of leverage, when the product of the power and the power arm is equal to the product of the resistance and the resistance arm, the resistance will be greater than the power, that is, the force of the piston 130 moving at the first opening 220 can be amplified, thereby increasing the pressure of the hydraulic oil in the hydraulic oil area 260 and improving the seawater transportation efficiency. In addition, compared with offshore wave energy conversion devices, the seawater desalination system provided by the present invention has lower construction and maintenance costs, facilitates the transportation of seawater and fresh water, and at the same time, the float 110 also has the function of eliminating waves, reducing the erosion of seawater on the coast.

[0060] In one embodiment, if Figure 2 and Figure 3 As shown, the seawater desalination system further includes a position regulating device 300, which is arranged obliquely along the coast. The position regulating device 300 can adjust the position of the float 110 according to the change of the tide level to ensure the wave energy absorption efficiency. The position adjustment device 300 includes a float 310, a screw rod 320, a slider 330, a liquid level sensor 340 and a braking mechanism 350, wherein the slider 330 is threadedly connected to the screw rod 320, the support rod 140 is fixed on the slider 330, the float 310 is fixed on the slider 330 and is located at the end of the slider 330 close to the sea water 10, in contact with the sea water 10, and a liquid level sensor 340 is provided on the float 310, which is used to detect changes in tide level in real time; the braking mechanism 350 is fixedly connected to the screw rod 320, and the braking mechanism 350 is electrically connected to the liquid level sensor 340. The braking mechanism 350 can limit the rotation of the screw rod 320 according to the liquid level signal of the liquid level sensor 340, thereby limiting the position of the slider 330, and ultimately limiting the position of the float 110 in the sea water 10.

[0061] By providing a screw rod 320 and a slider 330 that cooperates with the screw rod 320 for transmission, the rotational motion of the screw rod 320 is converted into the linear motion of the slider 330, which has the advantages of high transmission efficiency, high precision, large load capacity, and high reliability. By providing a buoyancy tank 310, when the braking mode of the braking mechanism 350 is turned off, the buoyancy tank 310 can automatically adjust its position according to the gravity and buoyancy it is subjected to. By providing a liquid level sensor 340 on the buoyancy tank 310, real-time monitoring of tidal changes is achieved. The provision of the above-mentioned position adjustment device 300 ensures that the float 110 is always in the appropriate position, improving energy utilization efficiency. In addition, the position of the float 110 can be adjusted according to changes in the tidal level, ensuring the effect of wave dissipation, reducing the erosion of the embankment by seawater 10, and playing a protective role on the embankment.

[0062] In one embodiment, if Figure 4 and Figure 5 As shown, the braking mechanism 350 includes a motor (not shown in the figure), a transmission assembly, a rotating ring 3530 and a braking ring 3540, wherein the output end of the motor is connected to the transmission assembly, and the motor is used to drive multiple elastic brake pins 3520 in the transmission assembly to extend and retract synchronously.

[0063] The rotating ring 3530 is fixedly connected to the screw rod 320 to rotate synchronously with the screw rod 320. The brake ring 3540 is coaxially arranged with the rotating ring 3530. The brake ring 3540 is fixedly arranged in the brake mechanism 350, for example, and is fixedly connected to the housing of the brake mechanism 350 by fasteners or welding. It should be noted that the positional relationship between the coaxially arranged brake ring 3540 and the rotating ring 3530 is not limited. For example, the brake ring 3540 Figure 4 and Figure 5 As shown in FIG, the brake ring 3540 is disposed on the outer ring of the rotating ring 3530. The brake ring 3540 can also be disposed on the inner ring of the rotating ring 3530, and both can achieve the effect of braking the rotating ring 3530 through the brake ring 3540. In addition, the gap between the brake ring 3540 and the rotating ring 3530 can be arbitrarily set within the length range of the braking section 3524 of the elastic brake pin 3520, and all are within the scope of protection of the present application. Those skilled in the art can adjust it according to actual needs.

[0064] A plurality of first through holes 3531 are evenly provided on the side wall of the rotating ring 3530, and a plurality of second through holes 3541 are evenly provided on the side wall of the brake ring 3540. The number of elastic brake pins 3520, the first through holes 3531 and the second through holes 3541 are equal, and the angles of intervals are equal. The shapes of the first through holes 3531 and the second through holes 3541 are adapted to the shape of the elastic brake pin 3520 to allow the elastic brake pin 3520 to pass through.

[0065] With this design, the brake mechanism 350 only needs to start the motor when opening and closing the braking state to drive the extension and retraction of the elastic brake pin 3520 in the transmission assembly, and no electrical energy or other energy needs to be consumed during the braking process, thereby saving energy while ensuring the braking effect.

[0066] In one embodiment, continue to refer to Figure 4 and Figure 5 The transmission assembly also includes a fixed part 3511, a rotating part 3512 and a plurality of limiting pipes 3513, wherein the fixed part 3511 and the rotating part 3512 are both disc-shaped structures and are stacked along the axial direction of the fixed part 3511, that is, the x-axis direction in the figure, and the rotating part 3512 is connected to the output end of the motor. In this embodiment, the upper and lower position relationship of the stacked rotating part 3512 and the fixed part 3511 in the x-axis direction can be arbitrarily set and is not limited here. The rotating portion 3512 is provided with a plurality of arcuate through-holes 3515, and the fixed portion 3511 is provided with a plurality of corresponding linear grooves 3514 along the radial direction. A plurality of position-limiting pipes 3513 are fixedly connected to the outer wall of the fixed portion 3511, and the plurality of position-limiting pipes 3513 are respectively connected to the plurality of linear grooves 3514. The number of arcuate through-holes 3515, linear grooves 3514, and position-limiting pipes 3513 are equal, and are equal in number and position to the number of the elastic brake pin 3520, the first through-hole 3531, and the second through-hole 3541. The position-limiting pipes 3513 and linear grooves 3514 are provided to accommodate and positionally limit the elastic brake pin 3520, ensuring that the elastic brake pin 3520 can extend through the first through-hole 3531 and the second through-hole 3541 to achieve braking.

[0067] The first end of the limiting pipe 3513 is fixed on the circumferential surface of the fixing portion 3511 and is connected to the linear groove 3514. The second end of the limiting pipe 3513 is a free end, which is close to but not in contact with the rotating ring 3530 or the brake ring 3540 arranged on the periphery of the transmission assembly, so as to avoid friction generated when the rotating ring 3530 rotates with the screw rod 320, thereby affecting the adjustment of the position of the float 110; in addition, the second through hole 3541 on the brake ring 3540 corresponds to the position of the limiting pipe 3513 to ensure that the elastic brake pin 3520 in the limiting pipe 3513 can pass through the second through hole 3541.

[0068] The elastic brake pin 3520 includes a limiting protrusion 3521, a connecting section 3522, a spring 3523 and a braking section 3524, wherein the connecting section 3522, the spring 3523 and the braking section 3524 are located in the linear groove 3514 and the limiting pipe 3513, the limiting protrusion 3521 is arranged on the connecting section 3522 and protrudes toward the rotating part 3512, and the spring 3523 is arranged between the connecting section 3522 and the braking section 3524. In this embodiment, when viewed from the direction from the rotating portion 3512 to the fixed portion 3511, when the motor drives the rotating portion 3512 to rotate clockwise, under the joint action of the arc-shaped through hole 3515 and the linear groove 3514, the limiting protrusion 3521 moves in the arc-shaped groove in the direction away from the axis, thereby driving the connecting section 3522, the spring 3523 and the braking section 3524 to approach the rotating ring 3530 in the linear groove 3514 and the limiting pipe 3513; and when the motor drives the rotating portion 3512 to rotate counterclockwise, under the joint action of the arc-shaped through hole 3515 and the linear groove 3514, the limiting protrusion 3521 moves in the arc-shaped groove in the direction close to the axis, thereby driving the connecting section 3522, the spring 3523 and the braking section 3524 to move away from the rotating ring 3530 in the linear groove 3514 and the limiting pipe 3513.

[0069] by Figure 4 and Figure 5 Taking the braking mechanism 350 shown as an example, the working process of the braking mechanism provided in this embodiment is as follows:

[0070] When it is necessary to turn on the braking mode and maintain the braking state, the motor drives the rotating part 3512 to rotate, the elastic brake pin 3520 extends and abuts against the inner wall of the rotating ring 3530 under the elastic action of the spring 3523. When the rotating ring 3530 rotates to the point where the first through hole 3531 and the limiting pipe 3513 and the second through hole 3541 coincide, the braking section 3524 passes through the first through hole 3531 and into the second through hole 3541 under the action of the spring 3523, thereby achieving braking of the screw rod 320.

[0071] When it is necessary to turn off the braking mode and adjust the position of the float 110, the motor drives the rotating part 3512 to rotate, the elastic brake pin 3520 retracts and abuts against the inner wall of the rotating ring 3530 under the elastic action of the spring 3523. When the rotating ring 3530 rotates to the point where the first through hole 3531, the limiting pipe 3513 and the second through hole 3541 coincide with each other, the braking section 3524 passes through the first through hole 3531 and into the second through hole 3541 under the action of the spring 3523, thereby achieving braking of the screw rod 320.

[0072] It should be noted that the length of the braking segment 3524 is greater than the thickness of the rotating ring 3530. The thickness of the rotating ring 3530 refers to the radial distance from the inner circumferential wall to the outer circumferential wall of the rotating ring 3530. The length of the braking segment 3524 should be greater than the sum of the thickness of the rotating ring 3530 and half the thickness of the braking ring 3540 to ensure braking stability. Furthermore, when the spring 3523 is not deformed, the length of the elastic braking pin 3520 should be greater than the length of the limiting pipe 3513 to ensure that the braking segment 3524 can extend through the first through hole 3531 and the second through hole 3541 to achieve braking. In this embodiment, the length of the braking segment 3524 is greater than the sum of the thicknesses of the braking ring 3540 and the rotating ring 3530. In other embodiments, the length of the braking segment 3524 can be adjusted according to actual conditions to achieve the desired braking effect while reducing space usage.

[0073] In one embodiment, the rotating ring 3530 is provided with a plurality of closely spaced first through-holes 3531 along the circumference, and the brake ring 3540 is provided with a plurality of corresponding second through-holes 3541. This ensures that when braking is required, the elastic brake pin 3520 can be extended and promptly pass through the first and second through-holes 3531, 3541, thereby braking the screw rod 320. In another embodiment, the inclination angle of the threads on the screw rod 320 can be adjusted according to actual conditions to achieve a lower transmission ratio between the screw rod 320 and the slider 330. This ensures that even if the screw rod 320 rotates at a large angle, the displacement of the slider 330 is small, thus ensuring timely braking.

[0074] The transmission assembly in this embodiment has a simple structure and is not prone to wear, which greatly reduces raw material costs and maintenance costs.

[0075] In one embodiment, if Figure 3 As shown, the liquid level sensor 340 includes multiple channels 3130 disposed within the pontoon 310. The channels 3130 include a seawater inlet 3110 disposed on the side of the pontoon 310 and an atmospheric communication port 3120 disposed on the top surface of the pontoon 310. The channels 3130 communicate with the seawater 10 and the air. Specifically, the pressure within the channels 3130 is the same as the atmospheric pressure, ensuring that the liquid level within the channels 3130 is the same as the tidal level of the seawater 10. The liquid level sensor 340 includes a first liquid level sensor 3410, a second liquid level sensor 3420, and a third liquid level sensor 3430 disposed vertically from top to bottom. The first liquid level sensor 3410 and the second liquid level sensor 3420 are separated by a first preset distance, and the second liquid level sensor 3420 and the third liquid level sensor 3430 are separated by a second preset distance.

[0076] Properly setting the first and second preset distances ensures that the angle between connecting rod 120 and the sea level varies within a suitable range. This suitable angle range ensures that float 110 can maximize the collection of wave energy and improve the efficiency of converting wave energy into hydraulic energy. The first and second preset distances can be determined by the vertical distance between the liquid level sensor 340 and the bottom end of support rod 140.

[0077] Specifically, refer to Figure 2 The vertical distance h1 between the first liquid level sensor 3410 and the bottom end of the support rod 140 is determined as follows: When the sea level rises, the float 110 rises accordingly. Under the action of the lever, the piston 130 moves downward. Since the piston rod 1310 is hinged to the connecting rod 120, the angle between the piston rod 1310 and the connecting rod 120 changes with the movement of the piston 130. When the piston 130 reaches a certain position during its downward movement, the piston pipe restricts further rotation of the piston rod 1310, and the piston 130 cannot continue to move downward. At this time, the first liquid level sensor 3410 needs to send a signal to the controller, and the controller controls the braking mechanism 350 to turn off the braking mode to adjust the position of the float 110. Based on the geometric relationship of each structure in this state, the following is obtained:

[0078]

[0079] Wherein, a represents the length of the support rod 140, b represents the length of the piston rod 1310, c represents the vertical distance between the bottom end of the support rod 140 and the axis of the piston pipe, m represents the length of the connecting rod 120 from the fulcrum to the side of the float 110, n represents the length of the connecting rod 120 from the fulcrum to the side of the piston 130, the sum of m and n represents the total length of the connecting rod 120, and r represents the radius of the piston pipe. represents the angle between the piston rod 1310 and the inclined screw rod 320, It is an acute angle.

[0080] The vertical distance h2 between the third liquid level sensor 3430 and the bottom end of the support rod 140 is determined as follows: when the sea level drops, the float 110 drops accordingly. Under the action of the lever, the piston 130 moves upward. When the piston 130 reaches the top of the piston pipe and is about to fall out, the third liquid level sensor 3430 sends a signal to the controller, which controls the braking mechanism 350 to turn off the braking mode to adjust the position of the float 110. Based on the geometric relationship of each structure in this state, the following is obtained:

[0081]

[0082] Among them, a represents the length of the support rod 140, b represents the length of the piston rod 1310, c represents the vertical distance between the bottom end of the support rod 140 and the axial centerline of the piston pipe, m represents the length of the connecting rod 120 on one side of the float 110, n represents the length of the connecting rod 120 on one side of the piston 130, and h represents the maximum length that the piston 130 can move in the piston pipe.

[0083] The working process of the position adjustment device 300 in this embodiment is as follows:

[0084] An initial tide level in the channel 3130 is determined, the second liquid level sensor 3420 is installed at the initial tide level in the channel 3130 , and the first liquid level sensor 3410 and the third liquid level sensor 3430 are installed according to the first preset distance and the second preset distance.

[0085] When the first liquid level sensor 3410 continuously detects seawater within a set time period (the set time period is, for example, 1 minute, 2 minutes, etc., and can be set by technicians in this field according to actual needs), it indicates that the current tide level is high. The first liquid level sensor 3410 sends a liquid level signal to the controller. The controller controls the motor to start and drive the rotating part 3512 to rotate so that the elastic brake pin 3520 retracts, and the braking mode is turned off. At this time, the buoyancy of the float 310 is greater than the gravity. The float 310 rises under the action of the buoyancy, and the liquid level in the channel 3130 drops accordingly. Until the second liquid level sensor 3420 no longer detects seawater (that is, the movement distance of the float 310 in the y-axis direction is just greater than the first set distance), the second liquid level sensor 3420 sends a liquid level signal to the controller. The controller controls the motor to drive the rotating part 3512 to rotate, the elastic brake pin 3520 extends, and the braking mode is turned on, so that the position of the support rod 140 is fixed.

[0086] When the third liquid level sensor 3430 fails to detect seawater for a set time period (the set time period is, for example, 1 minute, 2 minutes, etc., and can be set by those skilled in the art according to actual needs), it indicates that the current tide level is low. The third liquid level sensor 3430 sends a liquid level signal to the controller, and the controller controls the motor to start, driving the rotating part 3512 to rotate so that the elastic brake pin 3520 retracts, and the braking mode is turned off; at this time, the gravity acting on the float 310 is greater than the buoyancy, and the float 310 descends under the action of gravity, and the liquid level in the channel 3130 rises accordingly, until the second liquid level sensor 3420 detects seawater (that is, when the movement distance of the float 310 in the y-axis direction is just greater than the second set distance), the second liquid level sensor 3420 sends a liquid level signal to the controller, and the controller controls the motor to drive the rotating part 3512 to rotate, the elastic brake pin 3520 extends, and the braking mode is turned on, so that the position of the support rod 140 is fixed.

[0087] In this embodiment, by setting a time period, it is possible to ensure that liquid level sensor 340 detects changes in the sea level position, rather than interference from waves or other factors, thereby ensuring accurate position adjustment. Placing liquid level sensor 340 inside pontoon 310, compared to mounting liquid level sensor 340 directly on the exterior of pontoon 310, not only reduces the impact of waves on tidal level detection by liquid level sensor 340 and avoids the influence of external factors such as rain and other impurities, but also reduces the possibility of damage or corrosion to liquid level sensor 340, thereby extending its service life.

[0088] In one embodiment, if Figure 3 As shown, a pipe is provided in channel 3130. The pipe extends out from one end of atmosphere communication port 3120 to form a bent portion, with the opening of the bent portion facing buoyancy tank 310. This design further prevents rainwater from falling into channel 3130 or waves from splashing into channel 3130 and affecting the detection of tide level by liquid level sensor 340. It also prevents foreign matter from entering channel 3130 and affecting the operation of liquid level sensor 340.

[0089] In an exemplary embodiment, Figure 6 As shown, the diaphragm structure 210 includes a first diaphragm 2110, a second diaphragm 2120 and a connecting rod 2130, wherein the first diaphragm 2110 is arranged in the hydraulic oil area 260, the second diaphragm 2120 is arranged in the seawater area 270, the first diaphragm 2110 and the second diaphragm 2120 are both fixedly connected to the inner wall of the hydraulic cylinder 200, and the connecting rod 2130 is arranged at the axial position of the hydraulic cylinder 200 and connects the first diaphragm 2110 and the second diaphragm 2120.

[0090] The first diaphragm 2110 deforms under the action of hydraulic oil, and this force is transmitted to the second diaphragm 2120 via the connecting rod 2130. This deformation of the second diaphragm 2120 alters the pressure in the seawater region 270. When the first diaphragm 2110 deforms toward the first opening 220, the second diaphragm 2120 also deforms toward the first opening 220, drawing seawater into the seawater region 270. When the first diaphragm 2110 deforms toward the second opening 230, the second diaphragm 2120 also deforms toward the second opening 230, forcing seawater out of the seawater region 270, thereby enabling the transport of seawater within the desalination system.

[0091] In this embodiment, by setting the connecting rod 2130 at the center position of the first diaphragm 2110 and the second diaphragm 2120, the maximum transmission of deformation is ensured; and the diaphragm structure 210 completely isolates the hydraulic oil and seawater, with high safety, low operating cost, simple structure, and easy maintenance.

[0092] In some embodiments, continue to refer to Figure 6The side of the second diaphragm 2120 that contacts the seawater is coated with a corrosion-resistant material to prevent the diaphragm structure 210 from being corroded by components or impurities in the seawater.

[0093] In one embodiment, continue to refer to Figure 6 The hydraulic oil area 260 is also provided with a fourth opening 250. The hydraulic oil storage device (not shown in the figure) is connected to the hydraulic oil area 260 through the fourth opening 250. A valve (not shown in the figure) is provided at the fourth opening 250. The hydraulic cylinder 200 also includes a displacement sensor 280. The displacement sensor 280 is used to detect the displacement of the first diaphragm 2110. The displacement sensor 280 is electrically connected to the valve to control the replenishment and discharge of the hydraulic oil in the hydraulic oil area 260.

[0094] Since the degree of deformation of the first diaphragm 2110 and the second diaphragm 2120 is limited, excessive pressure will cause damage to the diaphragm structure 210, while too little pressure will affect the transmission of energy. The amount of hydraulic oil in the hydraulic oil area 260 will directly affect the deformation of the first diaphragm 2110. Therefore, a displacement sensor 280 is set to monitor the displacement of the first diaphragm 2110 in real time. When the displacement sensor 280 detects that the displacement of the first diaphragm 2110 is greater than the first set threshold, the valve opens, and the hydraulic oil in the hydraulic oil area 260 is discharged into the hydraulic oil storage device under the action of the pump. When the displacement sensor 280 detects that the displacement of the first diaphragm 2110 is less than the first set threshold, the valve opens, and the hydraulic oil in the hydraulic oil storage device enters the hydraulic oil area 260 under the action of the pump, thereby reducing the possibility of damage to the diaphragm structure 210 while ensuring the energy transmission efficiency.

[0095] In one embodiment, if Figure 2 As shown, the seawater desalination equipment is arranged underground at the coast, the hydraulic cylinder 200 is arranged above or below the inclined coast, the position adjustment device 300 is arranged on the inclined coast, and the seawater desalination equipment includes a first pipeline 410, a pretreatment device 440, a second pipeline 420, a third pipeline 430 and a membrane desalination device 450 arranged in sequence along the flow direction of seawater; wherein, the pretreatment device 440 is connected to the seawater through the first pipeline 410, the second pipeline 420 connects the pretreatment device 440 and the second opening 230, the third pipeline 430 connects the third opening 240 and the membrane desalination device 450, and the membrane desalination device 450 is respectively provided with a brine drain outlet 4510 and a fresh water drain outlet 4520.

[0096] In one embodiment, continue to refer to Figure 2A first valve 4210 is provided on the second pipeline 420, and a second valve 4310 is provided on the third pipeline 430. The first valve 4210 and the second valve 4310 are both electrically connected to the controller, and the displacement sensor 280 in the hydraulic cylinder 200 is also electrically connected to the controller.

[0097] The working process of the seawater desalination equipment provided by the present invention is as follows:

[0098] When the displacement sensor 280 detects that the first diaphragm 2110 moves toward the hydraulic oil area 260, it sends a signal to the controller, and the controller controls the first valve 4210 to open and the second valve 4310 to close. Under the action of the hydraulic cylinder 200, seawater enters the pretreatment device 440 from the first pipe 410, and after pretreatment by the pretreatment device 440, enters the seawater area 270 of the hydraulic cylinder 200; when the displacement sensor 280 detects that the first diaphragm 2110 moves toward the seawater area 270, it sends a signal to the controller, and the controller controls the first valve 4210 to close and the second valve 4310 to open. Under the action of the hydraulic cylinder 200, seawater enters the membrane desalination device 450 through the third pipe 430. After treatment by the membrane desalination device 450, the brine and fresh water are discharged from the brine drain port 4510 and the fresh water drain port 4520 respectively, completing the seawater desalination process.

[0099] With this design, the first valve 4210 and the second valve 4310 cooperate with the hydraulic cylinder 200 to realize the transportation of seawater in the pretreatment device 440 and the membrane desalination device 450. Moreover, they are arranged underground at the coast, with a short transportation path, energy saving, and easy maintenance.

[0100] In another embodiment, both first valve 4210 and second valve 4310 are one-way valves, which allow fluid to flow in one direction while preventing reverse flow. When seawater pressure acts on the valve core, the one-way valve automatically opens. When seawater pressure ceases, the one-way valve automatically closes, preventing reverse flow. This facilitates the transport of seawater within the desalination system and simplifies the structure.

[0101] In one embodiment, if Figure 2 As shown, pretreatment device 440 includes an anthracite layer, a quartz sand layer, and a magnetite sand layer sequentially arranged along the flow direction of the seawater. Pretreatment device 440 is capable of filtering most suspended solids, bacteria, microorganisms, and large organic matter in the seawater, ensuring that the incoming water meets the requirements of membrane desalination device 450. In another embodiment, those skilled in the art may select the material of each filter layer in pretreatment device 440 based on actual needs, such as a gravel layer, a filter cotton layer, an activated carbon layer, etc., all of which are within the scope of protection of this application and are not further described here.

[0102] In one embodiment, reference Figure 2 The membrane desalination device 450 includes a rolled reverse osmosis membrane. The reverse osmosis membrane is an artificial semipermeable membrane with certain characteristics made by simulating biological semipermeable membranes. The pore size of the reverse osmosis membrane is very small, so it can effectively remove dissolved salts, colloids, microorganisms, organic matter, etc. in the water. After the high-pressure seawater passes through the reverse osmosis membrane, the membrane will isolate the salt molecules from the fresh water, which has the advantages of good separation effect, low energy consumption, and no pollution.

[0103] The process of desalination of seawater by a seawater desalination system in the above embodiment is as follows:

[0104] The float 110 is located in the seawater and moves under the action of waves. The lever structure drives the piston 130 to move at the first opening 220 of the hydraulic cylinder 200, performing work on the hydraulic oil in the hydraulic oil area 260. The wave energy is converted into hydraulic energy. Under the action of the hydraulic energy, the displacement sensor 280 detects that the first diaphragm 2110 moves toward the hydraulic oil area 260 and sends a signal to the controller. The controller controls the first valve 4210 to open and the second valve 4310 to close. Under the action of the hydraulic cylinder 200, seawater enters the pretreatment device 44 from the first pipe 410. 0, after being pre-treated by pre-treatment device 440, it enters seawater zone 270 of hydraulic cylinder 200. When displacement sensor 280 detects movement of first diaphragm 2110 toward seawater zone 270, it sends a signal to the controller, which closes first valve 4210 and opens second valve 4310. Under the action of hydraulic cylinder 200, seawater enters membrane desalination device 450 via third pipe 430. After treatment by membrane desalination device 450, concentrated brine and fresh water are discharged from concentrated brine outlet 4510 and fresh water outlet 4520, respectively, completing the seawater desalination process. During the desalination process, position adjustment device 300 can adjust the position of float 110 at any time based on changes in the tidal level detected by liquid level sensor 340.

[0105] In the present invention, by providing a wave energy harvesting device 100 with a lever structure and a hydraulic cylinder 200 connecting the wave energy harvesting device 100 and the seawater desalination equipment, wave energy is converted into hydraulic energy of the hydraulic oil in the hydraulic oil area 260 through the movement of the float 110. The hydraulic energy acts on the seawater area 270 through the diaphragm structure 210 and is directly used for the transportation of seawater in the seawater desalination equipment; the seawater desalination system arranged at the coast facilitates the transportation of seawater; the braking mechanism 350 does not consume energy during the braking process; and the position of the float 110 can also be adjusted in real time through the position adjustment device 300. The above-mentioned arrangement makes full use of wave energy, saves electricity, improves energy conversion efficiency, reduces maintenance costs, and realizes diversified comprehensive utilization such as cost sharing, space sharing, function sharing, and smart environmental protection with seawalls.

[0106] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, features defined as "first" or "second" may explicitly or implicitly include at least one of such features.

[0107] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0108] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0109] Other embodiments of the present invention will readily occur to those skilled in the art after considering the specification and practicing the invention disclosed herein. The present invention is intended to cover any variations, uses, or adaptations of the present invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered as exemplary only, with the true scope and spirit of the invention being indicated by the claims.

[0110] Other embodiments of the present invention will readily occur to those skilled in the art after considering the specification and practicing the invention disclosed herein. The present invention is intended to cover any variations, uses, or adaptations of the present invention that follow from the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered as exemplary only, with the true scope and spirit of the invention being indicated by the following claims.

[0111] It should be understood that the present invention is not limited to the exact construction described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A seawater desalination system, characterized in that: The seawater desalination system comprises: A wave energy harvesting device includes a float, a connecting rod, a support rod, and a piston, wherein a first end of the connecting rod is connected to the float, a second end of the connecting rod is connected to the piston, and the connecting rod and the support rod are rotatably connected to form a lever structure; A hydraulic cylinder comprising a diaphragm structure, a first opening, a second opening, and a third opening, wherein the hydraulic cylinder is divided into a hydraulic oil area and a seawater area by the diaphragm structure, the first opening being located in the hydraulic oil area, the piston being disposed at the first opening, and the second opening and the third opening being located in the seawater area; a seawater desalination device, the seawater desalination device being in communication with the seawater area through the second opening and the third opening; The hydraulic cylinder is used to convert the wave energy collected by the wave energy collection device into hydraulic energy for use in transporting seawater in the seawater desalination equipment; The seawater desalination system further comprises a position regulating device, which is arranged obliquely along the coast and is used to regulate the position of the float according to changes in the tide level; The position adjustment device includes a float, a screw rod, a slider, a liquid level sensor and a brake mechanism, wherein: The slider is threadedly connected to the screw rod, the support rod is fixed to the slider, the buoyancy box is fixed to the slider and is located at the end of the slider close to the seawater, and the buoyancy box is provided with the liquid level sensor, which is used to detect changes in tide level; The braking mechanism is fixedly connected to the screw rod, and the braking mechanism is electrically connected to the liquid level sensor; The braking mechanism includes a motor, a transmission assembly, a rotating ring and a braking ring, wherein: The transmission assembly includes a plurality of elastic brake pins, and the output end of the motor is connected to the transmission assembly to drive the plurality of elastic brake pins to extend and retract synchronously; The rotating ring is fixedly connected to the screw rod to rotate synchronously with the screw rod, the brake ring is coaxially arranged with the rotating ring, and the brake ring is fixedly arranged in the brake mechanism. A plurality of first through holes are evenly opened on the side wall of the rotating ring, and a plurality of second through holes are evenly opened on the side wall of the brake ring. The elastic brake pin, the first through holes and the second through holes are equal in number, and the shapes of the first through holes and the second through holes are adapted to the shape of the elastic brake pin to allow the elastic brake pin to pass through; The transmission assembly further includes a fixed portion, a rotating portion, and a plurality of limiting pipes, wherein the fixed portion and the rotating portion are both cylindrical structures and are stacked along the axial direction of the fixed portion, and the rotating portion is connected to the output end of the motor; The rotating part is provided with a plurality of arc-shaped through holes, the fixed part is provided with a plurality of linear grooves correspondingly along the radial direction, the plurality of limiting pipes are fixedly connected to the outer wall of the fixed part, and the plurality of limiting pipes are respectively communicated with the plurality of linear grooves; The elastic brake pin includes a limiting protrusion, a connecting section, a spring and a braking section, wherein the limiting protrusion is provided on the connecting section, and the spring connects the connecting section and the braking section; When the motor drives the rotating part to rotate, the limiting protrusion slides in the arc-shaped through hole, driving the connecting section, the spring and the braking section to move in the straight groove and the limiting pipe. The braking section is used to pass through the first through hole and the second through hole to achieve braking of the rotating ring.

2. The seawater desalination system according to claim 1, characterized in that: The first end of the support rod is rotatably connected to the first position of the connecting rod to form a fulcrum, and the second end of the support rod is arranged on the inclined coast; the power arm on the float side is larger than the resistance arm on the piston side.

3. The seawater desalination system according to claim 1, characterized in that: A channel is provided inside the buoyancy box, the channel including a seawater inlet provided on the side of the buoyancy box and an atmosphere communication port provided on the top surface of the buoyancy box, the channel communicating seawater and air; The liquid level sensor is arranged in the channel, and includes a first liquid level sensor, a second liquid level sensor, and a third liquid level sensor arranged in sequence from top to bottom in a vertical direction, the first liquid level sensor and the second liquid level sensor are separated by a first preset distance, and the second liquid level sensor and the third liquid level sensor are separated by a second preset distance; When the first liquid level sensor continuously detects seawater within a set time period, the motor drives the rotating part to rotate so that the elastic brake pin retracts, the braking mode is turned off, and the buoyancy chamber rises under the action of buoyancy. When the second liquid level sensor no longer detects seawater, the motor drives the rotating part to rotate so that the elastic brake pin extends, and the braking mode is turned on. When the third liquid level sensor continuously fails to detect seawater within a set time period, the motor drives the rotating part to rotate so that the elastic brake pin retracts, the braking mode is turned off, and the buoyancy tank descends under the action of gravity until the second liquid level sensor detects seawater. Then the motor drives the rotating part to rotate so that the elastic brake pin extends, and the braking mode is turned on.

4. The seawater desalination system according to claim 1, characterized in that: The diaphragm structure includes a first diaphragm, a second diaphragm and a connecting rod, wherein the first diaphragm is arranged in the hydraulic oil area, the second diaphragm is arranged in the seawater area, the first diaphragm and the second diaphragm are both fixedly connected to the inner wall of the hydraulic cylinder, and the connecting rod is arranged at the axial position of the hydraulic cylinder and connects the first diaphragm and the second diaphragm.

5. The seawater desalination system according to claim 4, characterized in that: The hydraulic oil area is also provided with a fourth opening, and the hydraulic oil storage device is connected to the hydraulic oil area through the fourth opening. A valve is provided at the fourth opening. The hydraulic cylinder also includes a displacement sensor, which is used to detect the displacement of the first diaphragm. The displacement sensor is electrically connected to the valve to control the replenishment and discharge of the hydraulic oil in the hydraulic oil area.

6. The seawater desalination system according to claim 5, characterized in that: The seawater desalination equipment is arranged underground at the coast, and comprises a first pipeline, a pretreatment device, a second pipeline, a third pipeline and a membrane desalination device arranged in sequence along the flow direction of seawater; The pretreatment device is connected to the seawater through the first pipe, the second pipe connects the pretreatment device and the second opening, the third pipe connects the third opening and the membrane desalination device, and the membrane desalination device is provided with a brine drain outlet and a fresh water drain outlet respectively.

7. The seawater desalination system according to claim 6, characterized in that: A first valve is provided on the second pipeline, and a second valve is provided on the third pipeline, and the first valve and the second valve are both electrically connected to the displacement sensor; When the displacement sensor detects that the first diaphragm moves toward the hydraulic oil area, the first valve opens and the second valve closes; when the displacement sensor detects that the first diaphragm moves toward the seawater area, the first valve closes and the second valve opens.

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