Solar sea water distillation device with multi-stage laminated structure and adjustable inclination

Abstract

The present invention relates to seawater desalination technology, and aims to provide a solar seawater distillation device with a multi-level stacked structure and adjustable inclination angle. The device includes: a vertically arranged water supply main pipe; a plurality of fixed frames arranged alternately and fixed on the water supply main pipe in parallel; a plurality of support frames, respectively connected to the fixed frames through rotating shafts; adjacent upper and lower layers of support frames form relatively closed evaporation chambers with baffles; solar absorbers are arranged on the topmost fixed frame and the supporting bottom plate, and a water-absorbing material layer is arranged under each layer of fixed frame and bottom plate. The present invention has modular device components, and the number of levels of the latent heat recovery part can be adjusted by increasing or decreasing the number of intermediate layers, thereby changing the actual fresh water production. Each layer of evaporation chamber has a better temperature distribution, can form stronger air convection, enhance steam migration and diffusion, and has a higher water production efficiency; the device has the function of water and salt co-production and the function of adjusting the optimal sunlight incident angle.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of seawater desalination, and particularly relates to a solar seawater distillation device with a multi-stage laminated structure and an adjustable inclination angle. BACKGROUND

[0002] Fresh water is one of the basic resources for human survival and industrial development. At present, a large number of countries or regions still face the problem of fresh water resource shortage, and developing seawater desalination technology is an important means to increase fresh water production. At present, large seawater desalination plants such as reverse osmosis and membrane distillation can provide fresh water supply for some areas, but these plants have the disadvantages of high energy consumption, high pollutant emission, and high requirement for infrastructure, which are difficult to meet the requirements of sustainable development and fresh water supply for off-grid or remote areas. Therefore, developing new energy-driven green small seawater desalination devices is an effective means to solve the above problems.

[0003] Solar energy is a widely distributed clean energy. After the light-heat conversion of solar energy, seawater evaporation is driven, and fresh water is obtained after condensation, which can realize green fresh water production without energy consumption, pollution and emission. There are many similar research results in existing research work, such as Chinese patent application CN112390315A, Chinese patent application CN111620401A, Chinese patent application CN111533198A, etc. However, the existing solar seawater desalination devices have the problems of low energy utilization efficiency, poor stability, limited steam diffusion speed, etc., which limit the actual fresh water production.

[0004] In terms of energy utilization, the existing solar seawater desalination devices have low utilization efficiency of steam latent heat energy. Most solar seawater desalination devices ignore the reuse of latent heat. In terms of stability, the performance of the existing solar seawater desalination devices will decay after long-time operation in salt water. Therefore, designing an effective salt-resistant strategy for the evaporator is the key to ensure the stable operation of the device. In terms of steam diffusion, the air convection capacity of the existing evaporator is poor, which increases the resistance of the steam transport process. Through scientific and reasonable structure design, using latent heat to drive secondary evaporation will become the key to improve the fresh water production of the solar seawater desalination device; at the same time, enhancing the air convection in the evaporator to make the steam quickly migrate between the evaporation and condensation surfaces is also an important means to improve the water production of the device. SUMMARY

[0005] The technical problem to be solved by the present application is to overcome the deficiencies in the prior art and provide a solar seawater distillation device with a multi-stage laminated structure and an adjustable inclination angle.

[0006] To solve the technical problem, the solution of the present application is:

[0007] A solar seawater distillation device with a multi-level stacked structure and adjustable inclination angle is provided, comprising: a vertically arranged water supply main pipe, the interior of which is hollow and filled with water-absorbing material, and the lower end of which is immersed in seawater; a plurality of fixed frames, divided into multiple layers arranged alternately and fixed to the water supply main pipe in parallel with each other; a rotating shaft is provided on the outer edge of each layer of the fixed frames; a plurality of supporting frames, each connected to the fixed frame via the rotating shaft and capable of rotating around the axis relative to the latter; a supporting bottom plate is installed on the supporting frame, and along the edge of each group of adjacent upper and lower layers of supporting frames, Several vertical and parallel baffles are installed to connect the two layers of support frames, thereby forming a relatively closed evaporation chamber; a water collection trough parallel to the rotating shaft is provided on the support base plate near the rotating shaft; a solar absorber is arranged in a fit on the topmost fixed frame and support base plate; multiple water-absorbing material layers are respectively arranged in a fit on the bottom of each layer of fixed frame and support base plate except the bottom layer; each water-absorbing material layer is connected to the water-absorbing material inside the water supply main pipe; the heat sink has its upper end installed on the bottommost support frame and its lower end immersed in seawater.

[0008] As a preferred solution of the present invention, the fixed frame includes a long-axis fixed frame located on the top layer, and short-axis fixed frames located on each layer below it; the long-axis fixed frame is installed on the top of the water supply main pipe, and a bottom plate is provided inside the frame, and its rotating shaft is installed along the length direction of the frame; the interior of the short-axis fixed frame is hollow and is mounted on the water supply main pipe, and two coaxial short axes are respectively connected to the frame parts located at both ends of the hollow part.

[0009] As a preferred solution of the present invention, rotating shafts are respectively provided on opposite outer edges of the fixed frames, and two supporting frames are symmetrically arranged on the outer sides of each layer of the fixed frames.

[0010] As a preferred solution of the present invention, the upper end of the baffle is movably mounted on the edge of the upper support frame by a pin, and the lower end thereof is movably embedded in a slide groove provided on the surface of the upper support frame; when each layer of the support frame rotates around the axis, the two ends of the baffle can rotate and displace accordingly, so that each layer of the support frame always remains parallel.

[0011] As a preferred solution of the present invention, a fresh water outlet is provided at the end of the water collecting tank on each supporting base plate, and each fresh water outlet is connected to a main water pipe located on the water supply main pipe through a water diversion pipe.

[0012] As a preferred solution of the present invention, a drainage strip is installed inside the water collecting tank.

[0013] As a preferred solution of the present invention, a heat-conducting material layer is used to connect the heat sink and the surface of the bottom support frame for heat conduction.

[0014] As a preferred scheme of the present application, the thin-layer super-hydrophilic water-absorbing material inside the water supply main pipe is filled with a single-layer non-woven fabric or dust-free paper with a thickness of no more than 1 mm; and the water-absorbing material layer is made of hard sponge foam material, and the outermost edge thereof serves as a crystalline salt scraping area.

[0015] As a preferred scheme of the present application, the solar light absorber adopts a selective absorber, and the substrate is an aluminum sheet with a vacuum-coated surface; and the water supply main pipe, the fixed frame, the support frame, the rotating shaft, the baffle and the heat sink are all made of stainless steel with a thickness of no more than 2 mm.

[0016] As a preferred scheme of the present application, the device further comprises a turnover driving mechanism, a first driving motor and a first connecting rod mechanism are arranged in the shell of the turnover driving mechanism, and an external power source is connected to the first driving motor through a wire; the first connecting rod mechanism is connected to the support frame through a pin, and is used to drive the support frame to change the inclination angle thereof; and the first driving motor is further connected to a controller and an upper computer in sequence through a signal line.

[0017] As a preferred scheme of the present application, each fixed frame is movably installed through a bearing sleeved on the water supply main pipe; and a rotating driving mechanism is further arranged in the shell, comprising a second driving motor and a second connecting rod mechanism, and an external power source is connected to the second driving motor through a wire; the second connecting rod mechanism is connected to any one of the fixed frames through a pin, and is used to drive all the fixed frames to change the rotation angle thereof; and the second driving motor is further connected to the controller and the upper computer in sequence through a signal line.

[0018] Compared with the prior art, the present application has the following beneficial effects:

[0019] 1. The present application has modularized device components. The fixed frame and the support frame have the same structure, and the configuration mode of the water-absorbing material layer of each intermediate layer is also the same except for the top and bottom layers. Therefore, the present application can adjust the number of stages of the latent heat recovery part by increasing or decreasing the number of intermediate layers, so as to change the actual fresh water yield.

[0020] 2. The present application innovatively adopts a multi-stage laminated frame structure. Compared with the traditional flat plate heat exchange structure, the evaporation chamber between each layer of frame structure has a better temperature distribution, can form a stronger air convection in the chamber, and can make the steam generated on the evaporation layer surface quickly migrate to the condensation layer surface, so as to enhance the steam migration and diffusion. Therefore, the present application has higher water production efficiency compared with the prior art.

[0021] 3. The present application has the function of water-salt co-production. When the device of the present application processes seawater, not only fresh water can be produced, but also salt crystals can be obtained, so that the present application has more use scenarios and higher resource utilization benefits.

[0022] 4、The application has the function of adjusting the optimal sunlight incidence angle. In addition to the support frame itself can rotate around the shaft to change the inclination angle, the application each layer frame can also be combined with bearing movable installation, after using the electric drive part, the orientation of the solar energy absorber can be changed according to the sunshine change, so that the solar energy utilization efficiency is maximized. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is the front view of the device structure of the application.

[0024] Figure 2 It is the structure diagram of the first layer fixed frame.

[0025] Figure 3 It is the structure diagram of the middle layer fixed frame.

[0026] Figure 4 It is the structure diagram of the bottom layer fixed frame.

[0027] Figure 5 It is the connection relationship diagram of the absorption material layer and the water absorption material in the water supply main pipe.

[0028] In the drawing, the reference signs are as follows: 1-solar energy absorber; 2-photothermal conversion layer support frame; 3-shutter; 4-long axis fixed frame; 5-short axis fixed frame; 6-latent heat recovery layer support frame; 7-water collecting tank; 8-fresh water outlet; 9-sliding chute; 10-heat dissipation layer support frame; 11-heat conducting material layer; 12-radiator; 13-water absorption material layer; 14-water supply main pipe; 15-crystallization zone; 16-drainage strip; 17-seawater. DETAILED DESCRIPTION

[0029] In the application, the serial numbers of the components, such as 'first','second', etc., are only used to distinguish the described objects, and do not have any sequence or technical meaning. Unless otherwise specified, the connection (coupling) in the application includes direct and indirect connection (coupling). In the description of the application, it should be understood that the orientation or position relationship indicated by the terms 'up', 'down', 'front', 'back', 'left', 'right','vertical', 'horizontal', 'top', 'bottom', 'inner', 'outer', 'clockwise', 'counterclockwise', etc. is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the application and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the application.

[0030] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0031] The specific implementation of the present invention is described in detail below with reference to the accompanying drawings.

[0032] 1. Product structure description

[0033] like Figure 1 As shown, the solar seawater distillation device with a multi-level stacked structure and adjustable inclination in the present invention includes: a water supply main pipe 14, multiple fixed frames, multiple support frames, multiple water-absorbing material layers 13, a solar absorber 1 and a heat sink 12.

[0034] The lower end of the vertically arranged water supply main pipe 14 is immersed in seawater 1, and its interior is hollow and filled with a thin layer of super hydrophilic water-absorbing material, optionally a single layer of non-woven fabric or dust-free paper with a thickness not exceeding 1 mm.

[0035] Multiple fixed frames are arranged in alternating layers and fixed parallel to each other on the water supply main pipe 14. Rotating shafts are located on the opposite outer edges of each layer of fixed frames, and two support frames are symmetrically arranged outside each layer of fixed frames. The support frames are connected to the fixed frames via rotating shafts and can rotate relative to the fixed frames. As a simplified solution, the rotating shaft and support frames can be arranged on only one side, but the example shown in the figure can double the water production efficiency.

[0036] The fixed frame includes a long axis fixed frame 4 located at the top layer and short axis fixed frames 5 located at each layer below it. The long axis fixed frame 4 is installed at the top of the water supply main pipe 14, and a bottom plate is provided in the frame. Its rotating shaft is installed along the length direction of the frame (such as Figure 2 The interior of the short shaft fixing frame 5 is hollow and is mounted on the water supply main pipe 14. The two coaxial short shafts are respectively connected to the frame parts at both ends of the hollow part (as shown in FIG. Figure 3 shown).

[0037] A support base plate is mounted on the support frame, and a plurality of vertical and parallel baffle plates 3 are mounted along the edges of each set of adjacent upper and lower support frames to connect the two layers of support frames, thereby forming a relatively closed evaporation chamber. The upper end of the baffle plate is movably mounted on the edge of the upper support frame by a pin, and the lower end is movably embedded in a sliding groove 9 provided on the surface of the upper support frame; when each layer of support frame rotates around the shaft, the two ends of the baffle plate can rotate and displace correspondingly, so that each layer of support frame always remains parallel. A water collecting groove 7 parallel to the rotating shaft is provided on the support base plate near the rotating shaft; the end of the water collecting groove 7 is provided with a fresh water outlet 8, and each fresh water outlet 8 is connected to a main water pipe on the water supply main pipe 14 through a water guide pipe. The water collecting groove 7 is provided with a drainage strip 16. The drainage strip 16 can be made of hard sponge foam material, which can be molded into a specific shape by its good mechanical strength.

[0038] The solar energy absorber 1 is arranged on the uppermost layer of the fixed frame and the support base plate. The solar energy absorber in the present application adopts a selective absorber, the substrate of which is an aluminum sheet with a vacuum-coated surface, the thermal conductivity of which is about 230 W / (m·k), and the absorption rate of which to the solar spectrum is about 93%, and the emissivity to the far infrared band is less than 13%. The processing of the solar energy absorber is a mature technology, which can be self-made by referring to the existing public literature (such as CN102042705A patent) or directly purchased as a commercial product (such as the solar heat blue film product of Xinyue Technology Co., Ltd.), and the present application does not make special requirements.

[0039] A plurality of water-absorbing material layers 13 are arranged on the bottom of each layer of fixed frame and support base plate except the lowermost layer, and each water-absorbing material layer 13 is connected to the water-absorbing material inside the water supply main pipe 14. The water-absorbing material layer 13 can be optionally made of hard sponge foam material, and the outermost edge thereof serves as a crystalline salt scraping area 15. Considering the demand for automation, a mechanical arm and collector capable of automatically scraping according to the amount of salt produced can also be configured for the device, and since its implementation is relatively simple, the present application will not be described in detail.

[0040] A heat sink 12 is movably mounted on the lowermost layer of the support frame by a pin at the upper end, and is immersed in seawater 17 at the lower end. A layer of heat-conducting material 11 is used to connect the heat sink 12 and the surface of the lowermost support frame for heat conduction. When each layer of support frame rotates around the shaft, the heat sink 12 can always remain vertical to ensure that the lower end is immersed in seawater 17.

[0041] Considering the need for salt and corrosion prevention, the water supply main pipe 14, the fixed frame, the support frame, the rotating shaft, the baffle plate 3 and the heat sink 12 are all made of stainless steel with a thickness of not more than 2 mm.

[0042] Since the present invention has the characteristics of tree layout, modular assembly and integrated coordinated action capability, it can be further Figure 1 The device in the invention is modified to automatically adjust the light intensity. Specifically, each fixed frame is movably installed by a bearing mounted on the water supply main pipe 14, and a flip drive mechanism and a rotation drive mechanism are configured to realize the drive. The implementation method is as follows: the device also includes a sealed shell with moisture-proof, salt-proof and corrosion-resistant properties, a built-in flip drive mechanism (including a first drive motor and a first connecting rod mechanism), and a rotation drive mechanism (including a second drive motor and a second connecting rod mechanism). The external power supply is connected to the two drive motors respectively through wires. The first connecting rod mechanism is connected to the support frame by a pin, which is used to drive it to change its tilt angle around the axis. The second connecting rod mechanism is connected to any fixed frame by a pin, which is used to drive all fixed frames to change their rotation angle around the axis. The first drive motor and the second drive motor are also connected to the controller and the host computer in sequence through signal lines. The host computer stores data on the duration of sunlight, its inclination angle, and its azimuth at the desalination device's location. Based on this data, it automatically loads control parameters for the inclination angle and rotation direction of the solar absorber 1. The controller transmits these control parameters to each drive motor based on control signals, ensuring that the solar absorber 1 always receives the optimal sunlight exposure angle, thereby improving the overall operating efficiency of the device. Because this control scheme is well within the skill of those skilled in the art, the present invention will not elaborate on its details.

[0043] 2. Description of functional zones:

[0044] From the perspective of functional implementation, the device of the present invention can be divided into the following parts:

[0045] Photothermal conversion part: includes a long-axis fixed frame 4 and a base plate, as well as a photothermal conversion layer support frame 2 and a support base plate arranged on both sides. The three frames are connected by a rotating shaft. When the long-axis fixed frame 4 is fixed, the photothermal conversion layer support frames 2 on both sides can rotate with the axis. The solar absorber 1 is also divided into three corresponding parts, of which the two sides can change the inclination angle as the frame rotates. The baffle 3 is located below the photothermal conversion layer support frame 2 and is connected to the frame by a pin-type movable connection (or connected by a rotating shaft). Under the action of gravity, when the frame rotates, the baffle 3 can always be vertically downward, thereby keeping its upper and lower frames parallel and forming a relatively closed evaporation chamber. The water-absorbing material layer 13 is installed below the frame and the base plate, and is used to absorb seawater from the water supply main pipe 14.

[0046] Latent heat recovery part: is by a plurality of structure same frame and bottom plate combination body up and down interval superimposed, the combination body includes short shaft fixed frame 5 and bottom plate, and the latent heat recovery layer support frame 6 and support bottom plate arranged at both sides, three frame are connected through pivot.The edge of latent heat recovery layer frame upper surface is provided with three first joint sliding groove 9, and the baffle 3 of light heat conversion part or upper latent heat recovery combination body is embedded in sliding groove 9 and is installed.The baffle 3 can move in sliding groove 9, can keep the integrity of the device to change the inclination of light heat conversion part and combination body simultaneously.The support bottom plate is provided with water collecting tank 7, so that the fresh water obtained by condensation can be collected under the drive of gravity.Drainage strip 16 is installed in water collecting tank 7, so that fresh water can be drained in time to fresh water outlet 8.Latent heat recovery layer support frame 6 and support bottom plate are installed with water absorption material layer below, which is used to absorb seawater from water supply main pipe 14.

[0047] Heat dissipation part: including short shaft fixed frame 5 and bottom plate, and the heat dissipation layer support frame 10 and support bottom plate arranged at both sides, three frame are connected through pivot.The upper surface of heat dissipation layer support frame 10 is provided with sliding groove 9, to fit the baffle 3 of upper latent heat recovery part.The lower of heat dissipation layer support frame 10 is installed with heat dissipation fin 12, and the two are connected through pin type movable connection (or through pivot connection), so that the device can keep heat dissipation fin 12 always vertical downward when changing the inclination.The heat dissipation fin is immersed in seawater during the operation of the device, and the device realizes effective heat dissipation through the cooling of seawater 17.In addition, the heat dissipation fin 12 and the frame are also connected through the heat conducting material layer 11, to improve the heat transfer effect between them.The upper surface of heat dissipation layer support frame 10 is also installed with water collecting tank 7, drainage strip 16 and fresh water outlet 8, to guide the fresh water condensed by latent heat recovery part.

[0048] Water transport part: including water supply main pipe 14, water absorption material layer 13, crystalline salt scraping area 15.The water absorption material layer is installed in light heat conversion part and latent heat recovery part, and the water absorption material filled in water supply main pipe 14 is connected with each level of water absorption material layer 13 in latent heat recovery part through the through hole or gap on the pipe wall.The water absorption material layer reduces water content when evaporating, and seawater continuously flows into each level of water absorption material layer 13 through water supply main pipe.The water absorption material layer 13 forms directional flow from the center to the edge, which drives the salt to gather in the crystalline salt scraping area 15 at the edge, and finally realizes saturated crystallization.Because the crystallization precipitates excess salt, the device can maintain salt tolerance and stable operation.In addition, the salt crystallization precipitated at the edge of water absorption material layer 13 can also be recovered, realizing salt production.

[0049] Three, operation process description:

[0050] The operation process of the solar seawater distillation device described in the application can be divided into two processes of evaporation and condensation of seawater and concentration and crystallization of salt.

[0051] 1. Evaporation-condensation process of seawater:

[0052] The fins 12 and the bottom of the water supply trunk pipe 14 are immersed in seawater 17. Under the capillary force of the water absorption material in the water supply trunk pipe 14, seawater 17 is transported to the water absorption material layer 13 at each level. When light appears, solar radiation is converted into heat by the solar absorber 1 and is conducted to the underlying photothermal conversion layer support frame 2 and bottom plate. The water absorption material layer 13 is closely attached to the underlying, and the seawater contained therein is heated to produce steam. The steam flows in the evaporation chamber formed by the baffle 3, condenses on the upper surface of the latent heat recovery layer support frame 6 and the bottom plate, and releases latent heat. The condensed fresh water is collected in the water collection tank 7 under the action of gravity, and flows out of the fresh water outlet 8 under the guidance of the drainage strip 16 and is collected. The latent heat released during the condensation of the steam is used to heat the seawater in the next level of water absorption material layer 13 through heat conduction of the latent heat recovery layer support frame 6 and the bottom plate, realizing the recycling of latent heat. The number of times of using latent heat in devices of different levels is different, so the fresh water yield is different, and increasing the level can significantly improve the fresh water yield of the device.

[0053] The latent heat transfer efficiency gradually decreases with the increase of the level, and there is a balance point between the level and the thermal efficiency. The level cannot be increased indefinitely, and if the level is still increased beyond the balance point, the increment of evaporation rate will be very low. The applicant verified through experiments during the research of the present application that when the level of the device does not exceed 7, a good balance between fresh water yield and thermal efficiency can be ensured. For example, under the standard light intensity of 1 kW m -2 , the experimental results show that the evaporation rates of 1-level, 3-level, 5-level and 7-level devices are 1.05, 2.24, 2.76 and 3.22 kg m -2 ·h -1 , respectively.

[0054] In the last level of the device, the steam condenses on the surface of the heat dissipation layer support frame 10 and the bottom plate and is collected, and the latent heat released by condensation is conducted by the auxiliary conduction of the heat conducting material layer 11 and is dissipated to the seawater 17 by the fins 12. Since the temperature of the seawater 17 is usually relatively stable, the device can achieve stable heat dissipation during operation, maximizing the temperature difference in the device to maintain high performance evaporation.

[0055] 2. Concentration and crystallization process of salt:

[0056] During operation, seawater 17 enters the device through the water supply trunk 14 and into the various levels of absorbent material 13. The supply of seawater is unidirectional due to the presence of the absorbent material 13 on both sides. As the evaporation process begins, the seawater forms a unidirectional flow from the water supply trunk 14 to the edge of the absorbent material 13. Due to the flow of the solution, salt ions migrate with it to the edge of the absorbent material 13 and eventually concentrate near the crystallized salt scraping zone 15. The crystallized salt scraping zone 15 has a larger air contact area than the absorbent material 13, which allows the solution to evaporate at a higher rate, thus concentrating the solution to saturation and precipitating salt crystals. The crystallized salt scraping zone 15 of each level is always arranged vertically, even under different inclination conditions, allowing the precipitated salt crystals to be easily scraped and collected. For this reason, it is also possible to automate the scraping of the salt crystals.

[0057] The above detailed description of the specific embodiments of the present application is only one of the embodiments of the present application, and the present application is not limited to the specific embodiments described above. Any equivalent modifications and substitutions of the present application made by those skilled in the art are also within the scope of the present application. Therefore, equivalent transformations and modifications made without departing from the spirit and scope of the present application should be encompassed within the scope of the present application.

Claims

1. A solar seawater distillation device with a multi-level stacked structure and adjustable inclination angle, characterized in that: The device includes: A vertically arranged water supply main pipe, which is hollow inside and filled with water-absorbing material, with its lower end immersed in seawater; Multiple fixed frames are arranged in multiple layers and fixed on the water supply main pipe in parallel with each other; a rotating shaft is provided on the outer edge of each layer of fixed frame; Multiple support frames are connected to each layer of fixed frames via rotating shafts and can rotate relative to the latter around the axis; a supporting base plate is installed on the support frame, and along the edges of each set of adjacent upper and lower support frames, a plurality of vertical and parallel baffles are installed to connect the two layers of support frames, thereby forming a relatively closed evaporation chamber; the upper ends of the baffles are movably mounted on the edges of the upper support frames via pins, and the lower ends thereof are movably embedded in slide grooves provided on the surface of the upper support frames; when each layer of support frames rotates around the axis, the ends of the baffles can rotate and displace accordingly, so that each layer of support frames always remains parallel; A water collecting trough parallel to the rotating shaft is provided on the supporting bottom plate near the rotating shaft; A solar absorber is arranged snugly on the uppermost fixed frame and the supporting base plate; Multiple water-absorbing material layers are arranged in a close-fitting manner on the bottom of each fixed frame and supporting base plate except the bottom layer; each water-absorbing material layer is connected to the water-absorbing material inside the water supply main pipe, and the outermost edge of the water-absorbing material layer serves as a crystallized salt scraping area; The heat sink has its upper end mounted on the lowest support frame and its lower end immersed in seawater; Each fixed frame is movably installed through bearings mounted on the water supply main pipe. The device is also equipped with a flip drive mechanism and a rotation drive mechanism. The former is used to drive the supporting frame to change the inclination angle, and the latter is used to drive all fixed frames to change the rotation angle.

2. The device according to claim 1, characterized in that The fixed frame includes a long-axis fixed frame located on the top layer and short-axis fixed frames located on each layer below it; the long-axis fixed frame is installed on the top of the water supply main pipe, a bottom plate is provided inside the frame, and its rotating shaft is installed along the length direction of the frame; the interior of the short-axis fixed frame is hollow and is mounted on the water supply main pipe, and two coaxial short axes are respectively connected to the frame parts located at both ends of the hollow part.

3. The device according to claim 1, characterized in that Rotating shafts are respectively provided on opposite outer edges of the fixed frames, and two supporting frames are symmetrically arranged on the outer sides of each layer of the fixed frames.

4. The device according to claim 1, characterized in that A fresh water outlet is provided at the end of the water collecting tank on each supporting bottom plate, and each fresh water outlet is connected to a main water pipe on the water supply main pipe through a water diversion pipe.

5. The device according to claim 1, characterized in that A drainage strip is arranged inside the water collecting tank.

6. The device according to claim 1, characterized in that A heat-conducting material layer is used to connect the heat sink and the surface of the bottom support frame for heat conduction.

7. The device according to claim 1, characterized in that A thin layer of super-hydrophilic absorbent material is used inside the water supply main pipe, and is filled with a single layer of non-woven fabric or dust-free paper with a thickness not exceeding 1mm; the absorbent material layer is made of hard sponge foam material.

8. The device according to claim 1, characterized in that The solar energy absorber is a selective absorber, the substrate of which is an aluminum sheet with a vacuum coating on the surface; the water supply main pipe, fixed frame, support frame, rotating shaft, baffle and heat sink are all made of stainless steel with a thickness not exceeding 2mm.

9. The device according to any one of claims 1 to 8, characterized in that A first drive motor and a first connecting rod mechanism are provided in the housing of the flip drive mechanism, and an external power supply is connected to the first drive motor via a wire; the first connecting rod mechanism is connected to the support frame via a pin, so as to drive it to change its tilt angle; the first drive motor is also connected to the controller and the host computer in sequence via a signal line; each fixed frame is movably mounted by a bearing sleeved on the water supply main pipe; a second drive motor and a second connecting rod mechanism are provided in the housing of the rotation drive mechanism, and an external power supply is connected to the second drive motor via a wire; the second connecting rod mechanism is connected to any one of the fixed frames via a pin, so as to drive all the fixed frames to change their rotation angles; The second driving motor is also connected to the controller and the host computer in sequence through signal lines.

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