Seawater desalination system

Abstract

The invention relates to the technical field of seawater desalination, in particular to a seawater desalination system. The seawater desalination system comprises a wave energy collecting device, a hydraulic cylinder and seawater desalination equipment, the wave energy collecting device comprises a floater, a connecting rod, a supporting rod and a piston, the first end of the connecting rod is connected with the floater, the second end of the connecting rod is connected with the piston, and the connecting rod and the supporting rod are rotationally connected to form a lever structure; the hydraulic cylinder comprises 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 formed in the hydraulic oil area, the piston is arranged at the first opening, and the second opening and the third opening are formed in the seawater area; the seawater desalination equipment is communicated with the seawater area through the second opening and the third opening. By means of the design, wave energy collected by the wave energy collecting device is directly converted into hydraulic energy of hydraulic oil in the hydraulic oil area, the hydraulic energy is directly used for conveying seawater in the seawater desalination equipment, the energy conversion efficiency is improved, and energy waste is avoided.

Description

Technical Field

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

[0002] Fresh water resources are the basis for industrial, agricultural, and urban development. Currently, many countries and regions are facing the problem of a shortage of fresh water resources. Seawater resources account for more than 97% of the total water resources on the earth. A seawater desalination system can remove salts and other impurities from seawater to obtain fresh water resources, effectively alleviating the problem of the shortage of fresh water resources.

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

[0004] 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, which includes: A wave energy collection device, including 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 is rotatably connected to the support rod to form a lever structure; A hydraulic cylinder, including a diaphragm structure, a first opening, a second opening, and a third opening. The hydraulic cylinder is separated by the diaphragm structure into a hydraulic oil area and a seawater area. The first opening is opened in the hydraulic oil area, the piston is arranged at the first opening, and the second opening and the third opening are opened in the seawater area; A seawater desalination device, which is communicated 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 the transportation of seawater in the seawater desalination device.

[0006] 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 an inclined coast; the power arm on one side of the float is greater than the resistance arm on one side of the piston.

[0007] In some embodiments of the present invention, the seawater desalination system further includes a position adjustment device, which is arranged along the coast in an inclined manner, and the position adjustment device is used to adjust the position of the float according to the change of the tide level; The position adjusting device includes a floating box, a lead screw, a slider, a liquid level sensor and a braking mechanism. Among them, The slider is threadedly connected to the lead screw. The support rod is fixed on the slider. The floating box is fixed on the slider and is located at one end of the slider close to the seawater. The liquid level sensor is arranged on the floating box and is used to detect the change of the tide level; The braking mechanism is fixedly connected to the lead screw and is electrically connected to the liquid level sensor.

[0008] In some embodiments of the present invention, the braking mechanism includes a motor, a transmission component, a rotating ring and a braking ring. Among them, The transmission component includes a plurality of elastic braking pins. The output end of the motor is connected to the transmission component to drive the plurality of elastic braking pins to synchronously expand and contract; The rotating ring is fixedly connected to the lead screw to rotate synchronously with the lead screw. The braking ring is coaxially arranged with the rotating ring. The braking ring is fixedly arranged in the braking mechanism. A plurality of first through holes are evenly formed on the side wall of the rotating ring. A plurality of second through holes are evenly formed on the side wall of the braking ring. The number of the elastic braking pins, the first through holes and the second through holes is equal. The shapes of the first through holes and the second through holes are both adapted to the shape of the elastic braking pins for the elastic braking pins to pass through.

[0009] In some embodiments of the present invention, the transmission component further includes a fixing part, a rotating part and a plurality of limiting pipes. Among them, both the fixing part and the rotating part are cylindrical structures and are stacked along the axial direction of the fixing part. The rotating part is connected to the output end of the motor; A plurality of arc-shaped through holes are formed on the rotating part. A plurality of linear grooves are correspondingly formed on the fixing part in the radial direction. The plurality of limiting pipes are fixedly connected to the outer wall of the fixing part. The plurality of limiting pipes are respectively communicated with the plurality of linear grooves; The elastic braking pin includes a limiting protrusion, a connecting section, a spring and a braking section. Among them, the limiting protrusion is arranged 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 linear groove and the limiting pipe. The braking section is used to pass through the first through hole and the second through hole to realize the braking of the rotating ring.

[0010] In some embodiments of the present invention, a channel is formed inside the floating box. The channel includes a seawater inlet formed on the side surface of the floating box and an air communication port formed on the top surface of the floating box. The channel communicates seawater and air; The liquid level sensor is arranged in the channel. The liquid level sensor includes a first liquid level sensor, a second liquid level sensor and a third liquid level sensor which are arranged in sequence from top to bottom in the vertical direction. A first preset distance is provided between the first liquid level sensor and the second liquid level sensor, and a second preset distance is provided between the second liquid level sensor and the third liquid level sensor; The initial tide level is at the second liquid level sensor, 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 and the braking mode is turned off. The floating box rises under the action of buoyancy until the second liquid level sensor can no longer detect seawater, then 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 and the braking mode is turned off. The floating box 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.

[0011] In some embodiments of the present invention, the diaphragm structure includes a first diaphragm, a second diaphragm and a connecting rod. Among them, the first diaphragm is arranged in the hydraulic oil area, the second diaphragm is arranged in the seawater area, both the first diaphragm and the second diaphragm are fixedly connected to the inner wall of the hydraulic cylinder, and the connecting rod is arranged at the axis position of the hydraulic cylinder and connects the first diaphragm and the second diaphragm.

[0012] In some embodiments of the present invention, the hydraulic oil area is further provided with a fourth opening. The hydraulic oil storage device is communicated with the hydraulic oil area through the fourth opening. A valve is arranged at the fourth opening. The hydraulic cylinder further includes a displacement sensor for detecting 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.

[0013] In some embodiments of the present invention, the seawater desalination device is arranged underground at the coast. The seawater desalination device includes a first pipeline, a pretreatment device, a second pipeline, a third pipeline and a membrane desalination device which are arranged in sequence along the seawater flow direction; Among them, the pretreatment device is communicated with seawater through the first pipeline. The second pipeline connects the pretreatment device and the second opening. The third pipeline connects the third opening and the membrane desalination device. The membrane desalination device is respectively provided with a concentrated brine drain port and a fresh water drain port.

[0014] In some embodiments of the present invention, a first valve is provided on the second pipeline, and a second valve is provided on the third pipeline. Both the first valve and the second valve are electrically connected to the displacement sensor; When the displacement sensor detects that the first diaphragm moves towards the hydraulic oil area, the first valve opens and the second valve closes; when the displacement sensor detects that the first diaphragm moves towards the seawater area, the first valve closes and the second valve opens.

[0015] The technical solutions provided by the embodiments of the present invention may include the following beneficial effects: A seawater desalination system provided by the present invention, through 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, converting the wave energy into the hydraulic energy of the hydraulic oil in the hydraulic oil area through the movement of the float. This 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, simplifying the energy conversion steps and improving the energy conversion efficiency.

[0016] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings herein are incorporated into the specification and form a part of this specification, showing embodiments consistent with the present invention and used together with the specification to explain the principles of the present invention.

[0018] Figure 1 is a schematic perspective view of a seawater desalination system shown according to an exemplary embodiment; Figure 2 is a schematic structural view of a seawater desalination system shown according to an exemplary embodiment; Figure 3 is a schematic structural view of a position adjustment device shown according to an exemplary embodiment; Figure 4 is a schematic structural view of a braking mechanism when the braking mode is turned on shown according to an exemplary embodiment; Figure 5 is a schematic structural view of a braking mechanism when the braking mode is turned off shown according to an exemplary embodiment; Figure 6 is a schematic structural view of a hydraulic cylinder shown according to an exemplary embodiment.

[0019] Reference numerals: 10, seawater; 100. Wave energy collection device; 110. Floater; 120. Connecting rod; 130. Piston; 1310. Piston rod; 140. Support rod; 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; 300. Position adjusting device; 310. Float box; 3110. Seawater inlet; 3120. Atmosphere communication port; 3130. Channel; 320. Lead screw; 330. Slide block; 340. Liquid level sensor; 3410. First liquid level sensor; 3420. Second liquid level sensor; 3430. Third liquid level sensor; 350. Braking mechanism; 3511. Fixed part; 3512. Rotating part; 3513. Limiting pipeline; 3514. Linear groove; 3515. Arc 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; 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 port; 4520. Fresh water drain port. Detailed implementation manners

[0020] Here, the exemplary embodiments will be described in detail, and the examples are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementation manners described in the following exemplary embodiments do not represent all the implementation manners consistent with the present invention. On the contrary, they are only examples of the devices and methods consistent with some aspects of the present invention as detailed in the appended claims.

[0021] Fresh water resources are the basic conditions for the development of various industries. At present, many countries and regions are facing the problem of shortage of fresh water resources. Seawater resources account for more than 97% of the total water resources on the earth. The seawater desalination system can remove the salt and other impurities in seawater to obtain fresh water resources, effectively alleviating the problem of shortage of fresh water resources. However, at present, the transportation of seawater in the seawater desalination system is often achieved through the conversion of electric energy, such as devices like electric high-pressure pumps and water pumps, resulting in waste of electric energy.

[0022] To solve the above technical problems, the present invention provides a seawater desalination system. By providing 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, converting the wave energy into the hydraulic energy of the hydraulic oil in the hydraulic oil area through the movement of the float. This hydraulic energy acts on the seawater area through a diaphragm structure and is directly used for the transportation of seawater in the seawater desalination equipment, making full use of wave energy, saving electric energy, and improving the energy conversion efficiency.

[0023] The following will describe in detail a seawater desalination system provided according to the present invention with reference to the accompanying drawings.

[0024] It should be noted that Figures 2 to 3 the x-axis direction in Figure 1 is the horizontal direction, and the plane where the x-axis and z-axis are located in Figures 1 to 3 is the direction of the sea level, and the y-axis direction in Figures 4 to 6 is the vertical direction; while the coordinate axis directions in Figures 1 to 3 are only used to describe the orientation relationship and can be the same as or different from the coordinate axis directions in

[0025] The embodiments of the present invention provide a seawater desalination system, as shown in Figure 1 , Figure 2 and Figure 6 . The seawater desalination system includes a wave energy collection device 100, a hydraulic cylinder 200, and a seawater desalination equipment. Among them, the wave energy collection 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 rotationally 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 and serves 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. The piston 130 moves in the piston pipeline, and the piston pipeline is communicated with the first opening 220 of the hydraulic cylinder 200 and serves 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 collection device 100 and the seawater desalination equipment. Refer to Figure 6, the hydraulic cylinder 200 includes a diaphragm structure 210, a first opening 220, a second opening 230, and a third opening 240. The diaphragm structure 210 is disposed in the middle section of the hydraulic cylinder 200, separating the hydraulic cylinder 200 into a hydraulic oil area 260 and a seawater area 270. The first opening 220 is opened in the hydraulic oil area 260, and the second opening 230 and the third opening 240 are opened in the seawater area 270. The seawater desalination device communicates with the seawater area 270 of the hydraulic cylinder 200 through the second opening 230 and the third opening 240. The hydraulic cylinder 200 converts the wave energy collected by the wave energy collection device 100 into hydraulic energy for the conveyance of seawater in the seawater desalination device.

[0026] 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 set as a spherical shape or other shapes, which are not limited herein.

[0027] The working process of the seawater desalination system in this embodiment is as follows: The float 110 is located in the seawater 10 and moves under the action of waves. It drives the piston 130 to move at the first opening 220 of the hydraulic cylinder 200 through the lever structure, doing work on the hydraulic oil in the hydraulic oil area 260, and converting the 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 discharging of seawater in the seawater area 270, that is, realizing the conveyance of seawater in the seawater desalination device, and the seawater is desalinated during the conveyance process.

[0028] By providing the wave energy collection device 100 with a lever structure and the hydraulic cylinder 200 connecting the wave energy collection device 100 and the seawater desalination device, the movement of the float 110 under the action of waves drives the movement of the piston 130 at the first opening 220 of the hydraulic cylinder 200, converting the wave energy into the 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, directly used for the conveyance of seawater in the seawater desalination device, taking the wave energy directly as the power for seawater conveyance, without the need for electrical energy conversion, simplifying the energy conversion steps and improving the energy conversion efficiency.

[0029] In one embodiment, as Figure 2 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. The second end of the support rod 140 is disposed on the inclined coast, and the power arm on one side of the float 110 is greater than the resistance arm on one side of the piston 130, that is, the fulcrum is set closer to the piston 130 side.

[0030] Since the power arm is greater than the resistance arm, according to the lever principle, 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, it can amplify the force for the piston 130 to move at the first opening 220, increase the pressure of the hydraulic oil in the hydraulic oil area 260, and improve the seawater transportation efficiency; in addition, compared with the offshore wave energy conversion device, the seawater desalination system provided by the present invention has lower construction and maintenance costs, is convenient for the transportation of seawater and fresh water, and at the same time, the float 110 also has the function of dissipating waves, reducing the erosion of the seawater on the coast.

[0031] In one embodiment, as Figure 2 and Figure 3 shown, the seawater desalination system further includes a position adjusting device 300. The position adjusting device 300 is inclined along the coast. The position adjusting 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 adjusting device 300 includes a floating box 310, a lead screw 320, a slider 330, a liquid level sensor 340 and a braking mechanism 350. Among them, the slider 330 is threadedly connected to the lead screw 320, the support rod 140 is fixed on the slider 330, the floating box 310 is fixed on the slider 330 and is located at one end of the slider 330 close to the seawater 10 and contacts the seawater 10. A liquid level sensor 340 is arranged on the floating box 310, and the liquid level sensor 340 is used to detect the change of the tide level in real time; the braking mechanism 350 is fixedly connected to the lead screw 320, the braking mechanism 350 is electrically connected to the liquid level sensor 340, and the braking mechanism 350 can limit the rotation of the lead screw 320 according to the liquid level signal of the liquid level sensor 340, and then limit the position of the slider 330, and finally limit the position of the float 110 in the seawater 10.

[0032] By setting the lead screw 320 and the slider 330 cooperating with the lead screw 320 for transmission, the rotational motion of the lead screw 320 is converted into the linear motion of the slider 330, which has the advantages of high transmission efficiency, high precision, large load capacity, high reliability, etc. By setting the floating box 310, when the braking mode of the braking mechanism 350 is turned off, the floating box 310 can automatically adjust its position according to the gravity and buoyancy it receives. By arranging the liquid level sensor 340 on the floating box 310, the real-time monitoring of the change of the tide level is realized. The setting of the above-mentioned position adjusting device 300 ensures that the float 110 is always in a suitable position, improves the energy utilization efficiency, and in addition, can adjust the position of the float 110 according to the change of the tide level, ensures the wave dissipation effect, reduces the erosion of the seawater 10 on the embankment, and plays a protective role for the embankment.

[0033] In one embodiment, as Figure 4 and Figure 5As 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. The output end of the motor is connected to the transmission assembly, and the motor is used to drive the synchronous expansion and contraction of a plurality of elastic braking pins 3520 in the transmission assembly.

[0034] The rotating ring 3530 is fixedly connected to the lead screw 320 to rotate synchronously with the lead screw 320. The braking ring 3540 is coaxially arranged with the rotating ring 3530. The braking ring 3540 is fixedly arranged in the braking mechanism 350, for example, fixedly connected to the housing of the braking mechanism 350 by fasteners or welding. It should be noted that the positional relationship between the coaxially arranged braking ring 3540 and the rotating ring 3530 is not limited. The braking ring 3540 is, for example Figure 4 and Figure 5 as shown in the figure, arranged on the outer ring of the rotating ring 3530. The braking ring 3540 can also be arranged on the inner ring of the rotating ring 3530, and both can achieve the effect of braking the rotating ring 3530 through the braking ring 3540. In addition, the gap between the braking ring 3540 and the rotating ring 3530 can be set arbitrarily within the length range of the braking section 3524 of the elastic braking pin 3520, and all are within the protection scope of this application. Those skilled in the art can adjust according to actual needs.

[0035] A plurality of first through holes 3531 are evenly formed on the side wall of the rotating ring 3530, and a plurality of second through holes 3541 are evenly formed on the side wall of the braking ring 3540. The number of the elastic braking pins 3520, the first through holes 3531, and the second through holes 3541 is equal, and the intervals are at equal angles. The shapes of the first through holes 3531 and the second through holes 3541 are both adapted to the shape of the elastic braking pin 3520 for the elastic braking pin 3520 to pass through.

[0036] With such a design, the braking mechanism 350 only needs to start the motor when opening and closing the braking state to drive the expansion and contraction of the elastic braking pins 3520 in the transmission assembly, and no electric energy or other energy is consumed during the process of maintaining braking, saving energy while ensuring the braking effect.

[0037] In one embodiment, continue to refer to Figure 4 and Figure 5, the transmission assembly further includes a fixing part 3511, a rotating part 3512 and a plurality of limiting pipes 3513. Among them, both the fixing part 3511 and the rotating part 3512 are disc-shaped structures and are stacked along the axial direction of the fixing part 3511, that is, the x-axis direction in the figure. The rotating part 3512 is connected to the output end of the motor. In this embodiment, the vertical position relationship between the stacked rotating part 3512 and the fixing part 3511 in the x-axis direction can be set arbitrarily and is not limited herein. A plurality of arc-shaped through holes 3515 are formed in the rotating part 3512, and a plurality of linear grooves 3514 are correspondingly formed in the fixing part 3511 in the radial direction. The plurality of limiting pipes 3513 are fixedly connected to the outer wall of the fixing part 3511, and the plurality of limiting pipes 3513 are respectively communicated with the plurality of linear grooves 3514. The number of the arc-shaped through holes 3515, the linear grooves 3514 and the limiting pipes 3513 is equal, and is equal to the number and position of the elastic brake pins 3520, the first through holes 3531 and the second through holes 3541. The arrangement of the limiting pipes 3513 and the linear grooves 3514 is used to accommodate and limit the elastic brake pins 3520, ensuring that the elastic brake pins 3520 can extend out of the first through holes 3531 and the second through holes 3541 to complete braking.

[0038] The first end of the limiting pipe 3513 is fixed on the circumferential surface of the fixing part 3511 and is communicated with the linear groove 3514. The second end of the limiting pipe 3513 is a free end and is close to but does not contact the rotating ring 3530 or the braking ring 3540 arranged on the outer periphery of the transmission assembly, so as to avoid generating friction when the rotating ring 3530 rotates with the lead screw 320 and affecting the adjustment of the position of the float 110; in addition, the second through hole 3541 on the braking 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.

[0039] The elastic braking pin 3520 includes a limit protrusion 3521, a connecting section 3522, a spring 3523, and a braking section 3524. Among them, the connecting section 3522, the spring 3523, and the braking section 3524 are located in the linear groove 3514 and the limit pipe 3513. The limit protrusion 3521 is arranged on the connecting section 3522 and protrudes towards the rotating part 3512. The spring 3523 is arranged between the connecting section 3522 and the braking section 3524. In this embodiment, when observing along the direction from the rotating part 3512 to the fixed part 3511, when the motor drives the rotating part 3512 to rotate clockwise, under the combined action of the arc-shaped through hole 3515 and the linear groove 3514, the limit 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 limit pipe 3513; when the motor drives the rotating part 3512 to rotate counterclockwise, under the combined action of the arc-shaped through hole 3515 and the linear groove 3514, the limit 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 limit pipe 3513.

[0040] Taking Figure 4 and Figure 5 the braking mechanism 350 shown as an example, the working process of the braking mechanism provided in this embodiment is as follows: 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 braking 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 position where the first through hole 3531, the limit pipe 3513, and the second through hole 3541 coincide, the braking section 3524 penetrates through the first through hole 3531 and penetrates into the second through hole 3541 under the action of the spring 3523, realizing the braking of the lead screw 320.

[0041] 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 braking 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 position where the first through hole 3531, the limit pipe 3513, and the second through hole 3541 coincide, the braking section 3524 penetrates through the first through hole 3531 and penetrates into the second through hole 3541 under the action of the spring 3523, realizing the braking of the lead screw 320.

[0042] It should be noted that the length of the braking section 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 section 3524 should be greater than the sum of the thickness of the rotating ring 3530 and half of the thickness of the braking ring 3540 to ensure the stability of braking. Additionally, in the state where the spring 3523 does not deform, the length of the elastic braking pin 3520 should be greater than the length of the limiting pipe 3513 to ensure that the braking section 3524 can extend out of the first through hole 3531 and the second through hole 3541 to complete braking. In this embodiment, the length of the braking section 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 section 3524 can be adjusted according to actual situations to achieve the effect of ensuring the braking effect while reducing space occupation.

[0043] In one embodiment, the rotating ring 3530 is provided with a plurality of first through holes 3531 arranged closely along the circumferential direction, and the braking ring 3540 is correspondingly provided with a plurality of second through holes 3541 to ensure that when braking is required, the elastic braking pin 3520 can pass through the first through hole 3531 and the second through hole 3541 in time after extending out, realizing the braking of the lead screw 320. In another embodiment, the inclination angle of the thread on the lead screw 320 can be adjusted according to actual situations, so that the transmission ratio between the lead screw 320 and the slider 330 is relatively low. Even if the lead screw 320 rotates by a large angle and the displacement of the slider 330 is small, the timeliness of braking can still be ensured.

[0044] The transmission component structure in this embodiment is simple and not prone to wear, greatly reducing the raw material cost and maintenance cost.

[0045] In one embodiment, as Figure 3 shown, the liquid level sensor 340 includes a plurality of them and is arranged inside the floating tank 310. A channel 3130 is opened inside the floating tank 310. The channel 3130 includes a seawater inlet 3110 opened on the side surface of the floating tank 310 and an atmospheric communication port 3120 opened on the top surface of the floating tank 310. The channel 3130 communicates seawater 10 and air, that is, the pressure in the channel 3130 is the same as the atmospheric pressure, ensuring that the liquid level in the channel 3130 is the same as the tide 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 arranged in sequence from top to bottom in the vertical direction. There is a first preset distance between the first liquid level sensor 3410 and the second liquid level sensor 3420, and a second preset distance between the second liquid level sensor 3420 and the third liquid level sensor 3430.

[0046] The reasonable setting of the first preset distance and the second preset distance can ensure that the angle between the connecting rod 120 and the sea level changes within a suitable range. The angle within the suitable range can ensure that the float 110 collects wave energy to the greatest extent and improves the conversion efficiency of wave energy into hydraulic energy. The first preset distance and the second preset distance can be determined by the vertical distance between the liquid level sensor 340 and the bottom end of the support rod 140.

[0047] Specifically, referring to Figure 2 , the distance h 1 between the first liquid level sensor 3410 and the bottom end of the support rod 140 in the vertical direction is determined as follows: When the sea level rises, the float 110 rises accordingly. Under the lever action, the piston 130 will move 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 will change with the movement of the piston 130. When the piston 130 moves downward and reaches a certain position, the piston pipe will restrict the further rotation of the piston rod 1310, and then 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 close the braking mode to adjust the position of the float 110. According to the geometric relationship of each structure in this state, it can be obtained that:

[0048] 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 axis line of the piston pipe, m represents the length from the fulcrum to the connecting rod 120 on the side of the float 110, n represents the length from the fulcrum to the connecting rod 120 on the side of the piston 130, the sum of m and n represents the total length of the connecting rod 120, r represents the radius of the piston pipe, represents the angle between the piston rod 1310 and the inclined lead screw 320, is an acute angle.

[0049] The distance h 2 between the third liquid level sensor 3430 and the bottom end of the support rod 140 in the vertical direction is determined as follows: When the sea level drops, the float 110 drops accordingly. Under the lever action, the piston 130 will move upward. When the piston 130 reaches the top of the piston pipe and is about to come out, the third liquid level sensor 3430 needs to send a signal to the controller, and the controller controls the braking mechanism 350 to close the braking mode to adjust the position of the float 110. According to the geometric relationship of each structure in this state, it can be obtained that:

[0050] Wherein, a represents the length of the support rod 140, b represents the length of the piston rod 1310, c represents the perpendicular distance from the bottom end of the support rod 140 to the axis line 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.

[0051] The working process of the position adjusting device 300 in this embodiment is as follows: Determine the initial tide level in the channel 3130, install the second liquid level sensor 3420 at the initial tide level in the channel 3130, and install the first liquid level sensor 3410 and the third liquid level sensor 3430 according to the first preset distance and the second preset distance.

[0052] 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 those skilled in the art can set it according to actual needs), it indicates that the current tide level is relatively high. The first liquid level sensor 3410 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 buoyancy force on the floating box 310 is greater than the gravity, and the floating box 310 rises under the action of the buoyancy force, and the liquid level in the channel 3130 drops accordingly until the second liquid level sensor 3420 no longer detects seawater (that is, when the moving distance of the floating box 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, and the controller controls the motor to drive the rotating part 3512 to rotate, and the elastic brake pin 3520 extends, and the braking mode is turned on, so that the position of the support rod 140 is fixed.

[0053] When the third liquid level sensor 3430 continuously fails to detect seawater within a set time period (the set time period is, for example, 1 minute, 2 minutes, etc., and those skilled in the art can set it according to actual needs), it indicates that the current tide level is relatively 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 on the floating box 310 is greater than the buoyancy force, and the floating box 310 drops under the action of the gravity, and the liquid level in the channel 3130 rises accordingly until the second liquid level sensor 3420 detects seawater (that is, when the moving distance of the floating box 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, and the elastic brake pin 3520 extends, and the braking mode is turned on, so that the position of the support rod 140 is fixed.

[0054] In this embodiment, by setting a time period, it can be ensured that the liquid level sensor 340 detects the change in the sea level position, rather than being interfered by waves or other factors, thus ensuring the accuracy of position adjustment. The liquid level sensor 340 is arranged inside the floating box 310. Compared with directly installing the liquid level sensor 340 on the outer surface of the floating box 310, it can not only reduce the influence of waves on the detection of the tide level by the liquid level sensor 340 and avoid the influence of the external environment, such as rainwater or other impurities, but also reduce the possibility of the liquid level sensor 340 being damaged or corroded, and extend its service life.

[0055] In one embodiment, as Figure 3 shown, a pipeline is arranged in the channel 3130, and the pipeline extends out at one end of the atmospheric connection port 3120 to form a bent portion, and the opening of the bent portion faces the floating box 310. With such a design, it further avoids rainwater falling into the channel 3130 or sea waves splashing into the channel 3130 and affecting the detection of the tide level by the liquid level sensor 340, and can also avoid external impurities entering the channel 3130 and affecting the operation of the liquid level sensor 340.

[0056] In an exemplary embodiment, as Figure 6 shown, the diaphragm structure 210 includes a first diaphragm 2110, a second diaphragm 2120, and a connecting rod 2130. Among them, the first diaphragm 2110 is arranged in the hydraulic oil area 260, the second diaphragm 2120 is arranged in the seawater area 270, both the first diaphragm 2110 and the second diaphragm 2120 are fixedly connected to the inner wall of the hydraulic cylinder 200, and the connecting rod 2130 is arranged at the axis position of the hydraulic cylinder 200 and connects the first diaphragm 2110 and the second diaphragm 2120.

[0057] The first diaphragm 2110 deforms under the action of the hydraulic oil, and transmits the acting force to the second diaphragm 2120 through the connecting rod 2130. The second diaphragm 2120 changes the pressure in the seawater area 270 by deforming. When the first diaphragm 2110 deforms towards the first opening 220, the second diaphragm 2120 deforms towards the first opening 220 accordingly, and seawater is sucked into the seawater area 270; when the first diaphragm 2110 deforms towards the second opening 230, the second diaphragm 2120 deforms towards the second opening 230 accordingly, and the seawater in the seawater area 270 is pressed out, realizing the transportation of seawater in the seawater desalination device.

[0058] In this embodiment, by arranging the connecting rod 2130 at the central position of the first diaphragm 2110 and the second diaphragm 2120, it ensures the maximum transmission of deformation; and the diaphragm structure 210 completely isolates the hydraulic oil and seawater, with high safety, low operating cost, and simple structure, which is convenient for maintenance.

[0059] In some embodiments, continue to refer to Figure 6, on the side where the second diaphragm 2120 contacts seawater, a corrosion-resistant material is coated to prevent the diaphragm structure 210 from being eroded by the components or impurities in seawater.

[0060] In one embodiment, with continued reference to Figure 6 , the hydraulic oil area 260 is further provided with a fourth opening 250. A hydraulic oil storage device (not shown in the figure) communicates with 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 further includes a displacement sensor 280 for detecting 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.

[0061] 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 small pressure will affect the energy transfer. The amount of hydraulic oil in the hydraulic oil area 260 will directly affect the deformation amount of the first diaphragm 2110. Therefore, by setting the displacement sensor 280 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 a 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 a pump. This reduces the possibility of damage to the diaphragm structure 210 while ensuring the energy transfer efficiency.

[0062] In one embodiment, as Figure 2 shown, the seawater desalination equipment is arranged underground at the coast. The hydraulic cylinder 200 is arranged on the ground or underground of the inclined coast. The position adjusting device 300 is arranged on the inclined coast. 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 seawater flow direction; wherein, the pretreatment device 440 communicates with 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. The membrane desalination device 450 is respectively provided with a concentrated brine drain port 4510 and a fresh water drain port 4520.

[0063] In one embodiment, with continued reference to Figure 2, a first valve 4210 is provided on the second pipeline 420, and a second valve 4310 is provided on the third pipeline 430. Both the first valve 4210 and the second valve 4310 are electrically connected to the controller, and the displacement sensor 280 in the hydraulic cylinder 200 is also electrically connected to the controller.

[0064] The working process of the seawater desalination equipment provided by the present invention is as follows: When the displacement sensor 280 detects that the first diaphragm 2110 moves towards the hydraulic oil area 260, it 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 440 from the first pipeline 410, and after being pretreated by the pretreatment device 440, it enters the seawater area 270 of the hydraulic cylinder 200; when the displacement sensor 280 detects that the first diaphragm 2110 moves towards the seawater area 270, it sends a signal to the controller. 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 pipeline 430. After being processed by the membrane desalination device 450, the concentrated brine and fresh water are respectively discharged from the concentrated brine drain port 4510 and the fresh water drain port 4520, completing the seawater desalination process.

[0065] With such a design, through the cooperation of the first valve 4210 and the second valve 4310 with the hydraulic cylinder 200, the transportation of seawater in the pretreatment device 440 and the membrane desalination device 450 is realized. Moreover, it is set underground at the coast, with a short transportation path, energy saving, and convenient maintenance.

[0066] In another embodiment, both the first valve 4210 and the second valve 4310 are one-way valves. A one-way valve is a valve that allows fluid to flow in one direction while preventing reverse flow. When the pressure of seawater acts on the valve core of the one-way valve, the one-way valve automatically opens. When the seawater pressure does not exist, the one-way valve automatically closes and can block the reverse flow of seawater, realizing the transportation of seawater in the seawater desalination equipment, and the structure is simpler.

[0067] In one embodiment, as Figure 2 shown, the pretreatment device 440 includes a bituminous coal layer, a quartz sand layer, and a magnetite sand layer arranged in sequence along the seawater flow direction. The pretreatment device 440 can filter most of the suspended solids, bacteria, microorganisms, and large particle organic substances in seawater to ensure that the influent meets the requirements of the membrane desalination device 450. In another embodiment, those skilled in the art can select the materials of each filter layer in the pretreatment device 440 according to actual needs, such as including: a gravel layer, a filter cotton layer, an activated carbon layer, etc., which are all within the protection scope of this application and will not be elaborated here.

[0068] In one embodiment, referring toFigure 2 , the membrane desalination device 450 includes a spiral wound reverse osmosis membrane. The reverse osmosis membrane is an artificial semi-permeable membrane with certain characteristics made by simulating biological semi-permeable membranes. The membrane pore size of the reverse osmosis membrane is very small, so it can effectively remove dissolved salts, colloids, microorganisms, organic matter, etc. in water. After high-pressure seawater passes through the reverse osmosis membrane, the membrane will isolate the salt molecules from the fresh water, having the advantages of good separation effect, low energy consumption, no pollution, etc.

[0069] The process of desalinating seawater by a seawater desalination system in the above embodiment is as follows: The float 110 is located in seawater and moves under the action of waves. It drives the piston 130 to move at the first opening 220 of the hydraulic cylinder 200 through a lever structure, doing work on the hydraulic oil in the hydraulic oil area 260, and converting wave energy into hydraulic energy; under the action of hydraulic energy, when the displacement sensor 280 detects that the first diaphragm 2110 moves towards the hydraulic oil area 260, it 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 440 from the first pipeline 410, and after being pretreated by the pretreatment device 440, it enters the seawater area 270 of the hydraulic cylinder 200; when the displacement sensor 280 detects that the first diaphragm 2110 moves towards the seawater area 270, it sends a signal to the controller. 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 pipeline 430. After being processed by the membrane desalination device 450, the concentrated brine and fresh water are respectively discharged from the concentrated brine drain port 4510 and the fresh water drain port 4520, completing the seawater desalination process. During the seawater desalination process, the position adjustment device 300 can adjust the position of the float 110 at any time according to the tide level change detected by the liquid level sensor 340.

[0070] In the present invention, by setting the wave energy collection device 100 with a lever structure and the hydraulic cylinder 200 connecting the wave energy collection device 100 and the seawater desalination equipment, wave energy is converted into the 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 for the transportation of seawater in the seawater desalination equipment; the seawater desalination system set on the coast is convenient for seawater transportation; the braking mechanism 350 does not consume energy during the braking process; and the position of the float 110 can be adjusted in real time by the position adjustment device 300. The above settings make full use of wave energy, save electric energy, improve the energy conversion efficiency, reduce the maintenance cost, and achieve diversified comprehensive utilization such as cost sharing, space sharing, function sharing, and intelligent environmental protection with the seawall.

[0071] It should be noted that the terms "first" and "second" are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features.

[0072] In the present invention, unless otherwise clearly defined and limited, terms such as "installed", "connected", "coupled", "fixed", etc. shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0073] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection 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 a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0074] After considering the specification and practicing the invention disclosed herein, those skilled in the art will readily conceive of other embodiments of the present invention. The present invention is intended to cover any variations, uses, or adaptations of the present invention, which follow the general principles of the present invention and include the common general knowledge or conventional technical means in the technical field not disclosed in the present invention. The specification and examples are only regarded as exemplary, and the true scope and spirit of the present invention are pointed out by the claims.

[0075] After considering the specification and practicing the invention disclosed herein, those skilled in the art will readily conceive of other embodiments of the present invention. The present invention is intended to cover any variations, uses, or adaptations of the present invention, which follow the general principles of the present invention and include the common general knowledge or conventional technical means in the technical field not disclosed in the present invention. The specification and examples are only regarded as exemplary, and the true scope and spirit of the present invention are pointed out by the following claims.

[0076] It should be understood that the present invention is not limited to the exact structures that have been described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. 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 collection device comprises a float, a connecting rod, a supporting 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 is rotatably connected to the supporting rod 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 is opened in the hydraulic oil area, the piston is arranged at the first opening, and the second opening and the third opening are opened in the seawater area; A seawater desalination device, wherein the seawater desalination device is connected to 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 the transportation of seawater in the seawater desalination equipment.

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 one side of the float is larger than the resistance arm on one side of the piston.

3. The seawater desalination system according to claim 1, characterized in that: 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 the change of the tide level; The position adjustment device includes a buoy, 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 on the slider, the buoyancy box is fixed on the slider and is located at one 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.

4. The seawater desalination system according to claim 3, characterized in that: 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 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 so as to allow the elastic brake pin to pass through.

5. The seawater desalination system according to claim 4, characterized in that: The transmission assembly further comprises a fixed part, a rotating part and a plurality of position-limiting pipes, wherein the fixed part and the rotating part are both cylindrical structures and are stacked along the axial direction of the fixed part, and the rotating part 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 position-limiting pipes are fixedly connected to the outer wall of the fixed part, and the plurality of position-limiting pipes are respectively connected to the plurality of linear grooves; The elastic brake pin comprises a limiting protrusion, a connecting section, a spring and a braking section, wherein the limiting protrusion is arranged 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.

6. The seawater desalination system according to claim 5, characterized in that: A channel is provided inside the pontoon, the channel comprising a seawater inlet provided on the side of the pontoon and an atmosphere communication port provided on the top surface of the pontoon, the channel communicating seawater and air; The liquid level sensor is arranged in the channel, and the liquid level sensor includes a first liquid level sensor, a second liquid level sensor and a third liquid level sensor which are arranged in sequence from top to bottom in the vertical direction, the first liquid level sensor and the second liquid level sensor are spaced apart by a first preset distance, and the second liquid level sensor and the third liquid level sensor are spaced apart by a second preset distance; The initial tide level is at the second liquid level sensor, 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 is retracted, the brake mode is turned off, and the buoyancy box rises under the action of buoyancy, until the second liquid level sensor detects no seawater, the motor drives the rotating part to rotate so that the elastic brake pin is extended, and the brake mode is turned on; When the third liquid level sensor fails to detect seawater for 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 box 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.

7. 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.

8. The seawater desalination system according to claim 7, characterized in that: The hydraulic oil area is also provided with a fourth opening, and the hydraulic oil storage device is connected with the hydraulic oil area through the fourth opening. A valve is provided at the fourth opening. The hydraulic cylinder also includes a displacement sensor, and the displacement sensor 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.

9. The seawater desalination system according to claim 8, 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.

10. The seawater desalination system according to claim 9, characterized in that: The second pipeline is provided with a first valve, the third pipeline is provided with a second valve, 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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