A solar thermal desalination device

Abstract

The present invention belongs to the technical field of seawater desalination equipment, and specifically relates to a solar thermal collection type seawater desalination device. The present invention provides an annular heat-generating belt and is matched with a circulation pipe, so that the heat-generating belt can, during the solar thermal collection and evaporation operation, alternately contact the heat-generating belt between an evaporating dish and external seawater through a circulating motion. On the one hand, during the circulating motion, the heat-generating belt can, to a certain extent, transport impurities, silt, etc. in the evaporating dish to the outside of the evaporating dish, thereby cleaning the evaporating dish and reducing the obstruction of light by impurities. On the other hand, during the circulating motion, the heat-generating belt not only contacts seawater of different concentrations, thereby transferring salt components from the evaporating dish to the external seawater, but also utilizes the temperature difference between the evaporating dish and the external seawater to cause a certain degree of thermal expansion and contraction of the heat-generating belt, and deformation of the heat-generating belt when the circulating roller drives the heat-generating belt to move, further accelerating the separation of the crystallized salt layer from the heat-generating belt.

Description

Technical Field

[0001] The invention belongs to the technical field of seawater desalination equipment, in particular to a solar heat collection type seawater desalination device. Background Art

[0002] With the increasing scarcity of fresh water resources, seawater desalination technology has become an important way to meet the water demand in coastal areas. Among them, solar thermal evaporation, as one of the methods of seawater desalination, has good development prospects due to its energy-saving and environmentally friendly characteristics, especially in small-scale seawater desalination equipment.

[0003] When using solar thermal evaporation to desalinate seawater, conversion components are often used to convert solar energy into thermal energy. At the same time, thermal insulation and heat-resistant structures are used to guide the converted heat, so that the thermal energy is concentrated into the seawater, and the thermal energy is used to heat and evaporate the seawater. However, as the water vapor continues to be output, the seawater will be concentrated, and the salt contained in the seawater will adhere to the evaporation container in the form of crystals, which will hinder the transmission of thermal energy, thereby reducing the efficiency of seawater desalination. In severe cases, it may even make the solar thermal evaporation operation completely impossible. Therefore, how to eliminate the obstruction of the heat transmission channel by crystallized salt during the evaporation of seawater is one of the technical problems that need to be solved urgently in the solar thermal desalination process.

[0004] For example, the related art discloses a small solar desalination device with the announcement number CN118771516B. This solution cleans the residues accumulated on the surface of the heat absorbing plate by scraping the surface of the heat absorbing plate, maintains the stability of the heat absorbing plate in absorbing solar energy, and collects the residues to a position where it does not affect the heat absorbing plate's absorption of solar energy. However, in actual application, it was found that due to the concentration of seawater on the heating plate to produce a crystallized salt layer, mechanical scraping alone, when the scraping force is small, has a poor effect on removing the crystallized salt layer, and when the scraping force is too large, it is easy to cause damage to the surface of the heating plate, thereby making it impossible to continue the seawater desalination operation.

[0005] In view of this, the present invention proposes a solar heat collection type seawater desalination device to solve the above technical problems. Summary of the Invention

[0006] In order to make up for the deficiencies of the prior art and solve the above-mentioned technical problems, the present invention proposes a solar heat collection type seawater desalination device.

[0007] The technical solution adopted by the present invention to solve the technical problem is as follows: the solar heat collection type seawater desalination device of the present invention comprises a suspension seat, an evaporation dish, a heat collection cover and a guide pipe;

[0008] The suspension seat is provided with a mounting groove, the evaporating dish is mounted in the mounting groove, the evaporating dish is a container with an open top, the heat collecting cover is mounted at the opening of the evaporating dish, the heat collecting cover is provided with a guide pipe, and the guide pipe is externally connected to a water storage device;

[0009] It also includes a circulating heating mechanism, which is installed on the evaporating dish and includes a heating belt, a circulating roller and a driving member;

[0010] The heat-generating belt is a flexible belt made of light-absorbing and heat-generating material. Through grooves are provided on both sides of the heat-collecting cover, and the heat-generating belt extends to the interior of the evaporating dish through the through grooves.

[0011] The heat-generating belt is fixedly connected end to end to form a ring structure, the bottom of the installation groove is open, the heat-generating belt extends to the bottom of the evaporating dish and contacts the seawater through the bottom opening of the installation groove;

[0012] The evaporating dish is rotatably mounted with symmetrically arranged circulation rollers, the heat-generating belt passes through the gaps of the circulation rollers, and the circulation rollers are used to drive the heat-generating belt to circulate and rotate.

[0013] Preferably, the heat collecting cover is composed of a mounting ring and a condenser, the mounting ring is fixedly mounted on the evaporating dish, the condenser is fixedly mounted inside the mounting ring, the condenser is a convex lens, and the condenser extends to the bottom of the evaporating dish.

[0014] Preferably, the through grooves are all U-shaped grooves, and the opening height of the through grooves on the outside of the evaporating dish is higher than the opening height of the through grooves on the inside of the evaporating dish.

[0015] Preferably, the driving member is composed of a transmission wheel, a rack and a support spring;

[0016] The transmission wheel is fixedly mounted on the end of the circulating roller, and the rack is fixedly mounted on one side of the mounting groove;

[0017] A supporting spring is fixedly installed at the bottom of the mounting groove, the evaporating dish is located above the supporting spring, and the rack is located on the ascending route of the transmission wheel.

[0018] Preferably, a guide groove is provided on the suspension seat, the guide groove is conductively connected to the mounting groove, sliders are fixedly installed on both sides of the evaporating dish, the sliders extend into the guide groove, the guide groove includes at least a descending section and an ascending section, the top end of the ascending section and the bottom end of the descending section are both inclined, the ascending section and the descending section are conductively connected at both ends, and the guide groove is annular as a whole.

[0019] Preferably, a lifting plate is fixedly mounted on the top of the support spring, and evenly distributed balls are rotatably mounted on the lifting plate.

[0020] Preferably, a drainage groove is provided on the heat collecting cover, the through groove is conductively connected to the drainage groove, an assembly plate is fixedly installed in the installation groove, and a drainage hole is provided on the drainage groove. When the slider moves along the descending section, the assembly plate always blocks the drainage hole.

[0021] Preferably, the edge of the suspension seat is designed to be arc-shaped, and the heat-generating belt extends into the drain hole.

[0022] Preferably, a salt discharge groove is provided on the evaporating dish, and a closing plate is installed on the evaporating dish by elastic lifting of a spring. In the initial state, the closing plate blocks the salt discharge groove. A shift rod is fixedly installed in the installation groove. When the slider moves to the end of the ascending section, the shift rod pushes the closing plate and the salt discharge groove to open.

[0023] Preferably, the side of the closing plate close to the salt discharge tank is made of elastic sealing material.

[0024] The beneficial effects of the present invention are as follows:

[0025] 1. The solar thermal desalination device of the present invention is characterized in that, by providing an annular heat-generating belt and a circulation tube, the heat-generating belt can, during the solar thermal evaporation operation, alternately contact the heat-generating belt between the evaporating dish and the external seawater through a circulating motion. On the one hand, during the circulating motion, the heat-generating belt can, to a certain extent, transport impurities, silt, etc. in the evaporating dish to the outside of the evaporating dish, thereby cleaning the evaporating dish and reducing the obstruction of light by impurities. On the other hand, during the circulating motion, the heat-generating belt not only contacts seawater of different concentrations, thereby transferring salt components from the evaporating dish to the external seawater, but also utilizes the temperature difference between the evaporating dish and the external seawater to cause a certain degree of thermal expansion and contraction of the heat-generating belt, and the deformation of the heat-generating belt when the circulating roller drives the heat-generating belt to move, thereby further accelerating the separation of the crystallized salt layer from the heat-generating belt. In addition, since the cleaning process generates less mechanical stress on the heat-generating belt, the heat-generating belt will not be significantly damaged.

[0026] 2. The solar thermal desalination device described in the present invention combines seawater replenishment with the cyclic drive of the heat-generating belt. In practical applications, not only does the weight change generated by the replenishment of seawater in the evaporating dish cause the evaporating dish to rise and fall and move laterally, but after the seawater reaches a preset level, replenishment is stopped to prevent the liquid level in the evaporating dish from being too high, which would cause the heated seawater to flow outward along the through-trough and affect the efficiency of heating and evaporation. Furthermore, the weight change generated by the evaporation of seawater is used to cause the heat-generating belt to be replaced. This ensures that seawater replenishment and replacement are carried out in a regular manner, effectively enhancing the degree of automation of the heat-collecting evaporation process. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention will be further described below with reference to the accompanying drawings.

[0028] Figure 1 is a perspective view of the present invention;

[0029] Figure 2 It is a three-dimensional picture of the suspension seat;

[0030] Figure 3 It is a three-dimensional diagram of the circulating heating mechanism;

[0031] Figure 4 It is a three-dimensional picture of the heat collecting cover;

[0032] Figure 5 This is a three-dimensional diagram of the assembly of the evaporating dish and the heating belt;

[0033] Figure 6 is a cross-sectional view of the present invention;

[0034] Figure 7 yes Figure 6 A partial enlarged view of point A in the middle;

[0035] Figure 8 It is a cross-sectional view of the evaporating dish of the present invention when it is in an ascending state;

[0036] In the figure: 1. Suspension seat; 11. Evaporating dish; 12. Guide pipe; 2. Mounting groove; 21. Heat-generating belt; 22. Through groove; 23. Circulation roller; 24. Mounting ring; 25. Condenser; 26. Transmission wheel; 27. Rack; 28. Support spring; 29. ​​Lifting plate; 3. Guide groove; 31. Slider; 4. Drainage groove; 41. Assembly plate; 42. Drain hole; 5. Salt discharge trough; 51. Closing plate; 52. Push rod. DETAILED DESCRIPTION

[0037] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0038] like Figures 1 to 8 As shown, the solar heat collection type seawater desalination device of the present invention comprises a suspension base 1, an evaporation dish 11, a heat collection cover and a guide pipe 12;

[0039] The suspension base 1 is provided with a mounting groove 2, and the evaporating dish 11 is installed in the mounting groove 2. The evaporating dish 11 is a container with an open top. The heat collecting cover is installed at the opening of the evaporating dish 11. The heat collecting cover is provided with a guide pipe 12, and the guide pipe 12 is connected to an external water storage device.

[0040] It also includes a circulating heating mechanism, which is installed on the evaporating dish 11. The circulating heating mechanism includes a heating belt 21, a circulating roller 23 and a driving member.

[0041] The heat-generating belt 21 is a flexible belt made of a light-absorbing and heat-generating material. To extend the service life of the heat-generating belt 21, the material used for the heat-generating belt 21 in the present invention preferably has good heat resistance and weather resistance. Through grooves 22 are formed on both sides of the heat collecting cover, and the heat-generating belt 21 extends into the interior of the evaporating dish 11 through the through grooves 22.

[0042] The heat-generating belt 21 is fixedly connected end to end to form a ring structure, and the bottom of the installation groove 2 is open. The heat-generating belt 21 extends to the bottom of the evaporation dish 11 and contacts the seawater through the bottom opening of the installation groove 2;

[0043] The evaporating dish 11 is rotatably mounted with symmetrically arranged circulation rollers 23 , through which the heat-generating belt 21 passes. The circulation rollers 23 are used to drive the heat-generating belt 21 to circulate and rotate.

[0044] The through grooves 22 are all U-shaped grooves, and the height of the through grooves 22 opening on the outside of the evaporating dish 11 is higher than the height of the through grooves 22 opening on the inside of the evaporating dish 11. The shape of the through grooves 22 allows seawater to be injected through the through grooves 22 by utilizing the height difference between the two ends of the through grooves 22, causing part of the seawater to remain in the through grooves 22, thereby achieving a liquid seal for the through grooves 22. Therefore, it will not only not hinder the circulation of the heat-generating belt 21, but also effectively prevent steam from leaking through the through grooves 22.

[0045] When desalinating seawater by solar thermal evaporation, the heat-generating belt 21, as one of the components for photothermal conversion and heat conduction, will, during the evaporation process, change from direct contact with the seawater in the early stage to intermittent contact with the seawater through a crystallized salt layer due to the concentration of seawater and the crystallization of salt. Since the crystallized salt layer significantly hinders the conduction of heat, the heat conduction efficiency is reduced, thereby reducing the evaporation efficiency of seawater. For this reason, the present invention is provided with a circulating heating mechanism. By performing a heating and cleaning cycle on the heat-generating belt 21, the heat-generating belt 21 is continuously cleaned by the crystallized salt layer during long-term use, thereby maintaining the evaporation efficiency of seawater.

[0046] Specifically, during the process of evaporating seawater and collecting fresh water, seawater is poured into the evaporation dish 11, and the heat collecting cover collects sunlight, causing the sunlight to irradiate the heat-generating belt 21, which converts the light energy into heat energy, thereby heating the seawater in the evaporation dish 11. It should be noted that in the present invention, the heat-generating belt 21 is made of a flexible light-absorbing and heat-generating material, which is a relatively mature technology in this field and will not be described in detail here. During the continuous heating process of seawater, the water molecules therein gradually separate from the seawater in the form of steam and flow along the guide pipe 12, which is the preferred material of the present invention. In one embodiment of the present invention, a water storage device is installed at one end of the guide pipe 12 away from the heat collecting cover, and the water storage device is preferably a container suspended on the sea surface. In order to facilitate the cooling and condensation of the steam, in a specific implementation, the middle part of the guide pipe 12 can be pulled by a heavy object and immersed in seawater. As the steam continues to be generated and condensed, it is finally stored in the water storage device. In other embodiments of the present application, the water storage device can also be set at other locations. The steam is condensed and collected through the transmission of the guide pipe 12 in conjunction with the condensing device. As the seawater continues to evaporate, the seawater in the evaporating dish 11 gradually concentrates. During the evaporation process, the salt components in the seawater have the probability of condensation. Therefore, after a certain period of evaporation, the driving part drives the circulating roller 23 to rotate. Since the heat-generating belt 21 extends into the gap between the two circulating rollers 23 and is clamped by the circulating roller 23, when the circulating roller 23 rotates, it will pull the heat-generating belt 21 to move. The heat-generating belt 21 is annular, which will make the heat-generating belt 21 do annular circulation motion. In the present invention, the bottom of the heat-generating belt 21 contacts the external seawater through the bottom opening of the installation groove 2. Therefore, when the crystallized salt condenses on the heat-generating belt 21, when the heat-generating belt 21 contacts the external seawater, due to the external seawater The concentration of the intermediate salt component decreases, causing the salt crystals condensed on the heat-generating belt 21 to gradually dissolve in the external seawater. Furthermore, in the present invention, the heat-generating belt 21 is preferably a strip-shaped structure having dense grooves on its surface. During the movement of the heat-generating belt 21, not only can the crystallized salt actively condensed on the heat-generating belt 21 be transported by the heat-generating belt 21, but also the silt, solid impurities, etc. deposited on the surface of the heat-generating belt 21 can be transported to the outside of the evaporation dish 11 by the heat-generating belt 21, thereby reducing the impact on the heat collection and evaporation operation. When the seawater in the evaporation dish 11 is concentrated, the seawater is replaced to carry out a continuous seawater desalination operation.

[0047] The present invention provides an annular heat-generating belt 21 and is matched with a circulation pipe, so that the heat-generating belt 21 can alternately contact the evaporating dish 11 and the external seawater through a circulating motion during the solar heat collection and evaporation operation. On the one hand, during the circulating motion, the heat-generating belt 21 can transport impurities, mud and sand in the evaporating dish 11 to the outside of the evaporating dish 11 to a certain extent, thereby cleaning the evaporating dish 11 and reducing the obstruction of impurities to light. On the other hand, during the circulation process, the heat-generating belt 21 not only contacts with seawater of different concentrations, thereby transferring salt components from the evaporating dish 11 to the external seawater, but also utilizes the temperature difference between the evaporating dish 11 and the external seawater to cause a certain degree of thermal expansion and contraction of the heat-generating belt 21, and the deformation when the circulating roller 23 drives the heat-generating belt 21 to move, thereby further accelerating the separation of the crystallized salt layer from the heat-generating belt 21. Moreover, since the mechanical stress generated on the heat-generating belt 21 during the cleaning process is relatively small, the heat-generating belt 21 will not be significantly damaged.

[0048] As a preferred embodiment of the present invention, the heat collecting cover is composed of a mounting ring 24 and a condenser 25. The mounting ring 24 is fixedly mounted on the evaporating dish 11, and the condenser 25 is fixedly mounted on the inner side of the mounting ring 24. The condenser 25 is a convex lens and extends to the bottom of the evaporating dish 11.

[0049] During the heat collection and evaporation process, in order to reduce the adsorption of water vapor on the heat collection cover and the resulting obstruction to the transmission of light, in the present invention, the heat collection cover is composed of a mounting ring 24 and a concentrator 25, wherein the concentrator 25 is a convex lens, and the bottom of the concentrator 25 is immersed in the seawater in the evaporation dish 11. Therefore, in actual application, since the bottom of the concentrator 25 is directly immersed in the seawater, the light collected by the concentrator 25 will not be obstructed by the steam and will be directly transmitted to the seawater and irradiated on the heat-generating belt 21 through the seawater. At the same time, it should be noted that although the liquid level in the evaporation dish 11 gradually decreases as evaporation continues, the shape of the concentrator 25 is set so that a part of the concentrator 25 is always below the liquid surface, so that the sunlight can irradiate the heat-generating belt 21 more smoothly. When the liquid level in the evaporation dish 11 approaches the bottom of the concentrator 25, the seawater in the evaporation dish 11 needs to be replaced to facilitate continuous seawater desalination operations.

[0050] As a preferred embodiment of the present invention, the driving member is composed of a transmission wheel 26, a rack 27 and a support spring 28;

[0051] The transmission wheel 26 is fixedly mounted on the end of the circulation roller 23, and the rack 27 is fixedly mounted on one side of the mounting groove 2;

[0052] A support spring 28 is fixedly installed at the bottom of the mounting groove 2 , the evaporating dish 11 is located above the support spring 28 , and the rack 27 is located on the ascending path of the transmission wheel 26 .

[0053] A guide groove 3 is provided on the suspension seat 1, and the guide groove 3 is conductively connected to the mounting groove 2. Sliders 31 are fixedly installed on both sides of the evaporating dish 11, and the slides 31 extend into the guide groove 3. The guide groove 3 includes at least a descending section and an ascending section. The top end of the ascending section and the bottom end of the descending section are both inclined. The ascending section and the descending section are conductively connected at both ends. The guide groove 3 is annular as a whole.

[0054] A lifting plate 29 is fixedly mounted on the top of the support spring 28 , and balls evenly distributed are rotatably mounted on the lifting plate 29 . The presence of the balls facilitates the evaporating dish 11 to generate lateral movement on the plane of the lifting plate 29 .

[0055] A drainage groove 4 is provided on the heat collecting cover, the through groove 22 is conductively connected to the drainage groove 4, an assembly plate 41 is fixedly installed in the installation groove 2, and a drainage hole 42 is provided on the drainage groove 4. When the slider 31 moves along the descending section, the assembly plate 41 always blocks the drainage hole 42.

[0056] The edge of the suspension seat 1 is designed in an arc shape, which facilitates guiding the waves to move above the installation groove 2. The movement of the waves can not only replenish seawater for the evaporation dish 11, but also clean the surface of the heat collecting cover. The heat-generating belt 21 extends into the drain hole 42.

[0057] In order to make the circulation of the heat-generating belt 21 more regular and to make the desalination of seawater continuous, in the present invention, in the initial state, there is no seawater in the evaporating dish 11. At this time, the evaporating dish 11 is supported by the support spring 28 and the lifting plate 29 and is located at the upper part of the mounting groove 2. At this time, when the external waves hit the suspension seat 1 and the heat collecting cover, the seawater is gathered in the drainage groove 4 under the guidance of gravity, and flows into the through groove 22 through the drainage groove 4, and then poured into the evaporating dish 11. As the liquid level in the evaporating dish 11 rises, the evaporating dish 1 1 gradually increases, thereby exerting pressure on the support spring 28. At the same time, under the guidance of the guide groove 3 on the slider 31, the evaporation dish 11 first descends vertically along the descending section, and then gradually transitions to the ascending section along the inclined portion at the bottom of the descending section. During the movement along the descending section, the drainage hole 42 is always blocked due to the presence of the assembly plate 41, so that seawater can continue to be poured into the evaporation dish 11. When the slider 31 moves to the ascending section, the assembly plate 41 is separated from the drainage hole 42, and the seawater flows into the drainage groove 4 and is discharged from the drainage hole 42. 2 is discharged, and since a part of the heat-generating belt 21 extends into the drain hole 42, the flow of seawater will flush the heat-generating belt 21, thereby enhancing the cleaning effect of the heat-generating belt 21. At the same time, when the slider 31 moves to the bottom of the ascending section, as the heat-collecting cover continues to collect sunlight and cooperates with the heat-generating belt 21 to heat the seawater, the seawater will continue to heat up and evaporate, thereby causing the seawater in the evaporation dish 11 to concentrate. In this process, the seawater leaves the evaporation dish 11 in the form of steam, which will reduce the overall weight of the evaporation dish 11. Under the action of the support spring 28, the heat-generating belt 21 will be discharged. The evaporating dish 11 moves upward along the ascending section. The driving wheel 26 on the circulation roller 23 is meshed with the rack 27 at this time. Therefore, as the evaporating dish 11 continues to rise, the circulation roller 23 will rotate and the heat-generating belt 21 will be driven, thereby replacing the heat-generating belt 21 outside the evaporating dish 11 with the inside of the evaporating dish 11, thereby maintaining the light-heat conversion and heat conduction effects of the heat-generating belt 21, ensuring the continuous progress of the evaporation operation. As the evaporating dish 11 continues to rise, when the evaporating dish 11 is obliquely guided from the top of the ascending section and enters the top of the descending section again, the next cycle can be carried out.

[0058] The present invention combines the replenishment of seawater with the circulation drive of the heat-generating belt 21. In practical applications, not only does the weight change caused by the replenishment of seawater in the evaporating dish 11 cause the evaporating dish 11 to be raised and lowered and moved laterally, but after the seawater is replenished to a preset liquid level, the replenishment of seawater is stopped to prevent the liquid level in the evaporating dish 11 from being too high, which would cause the heated seawater to flow outward along the through groove 22 and affect the efficiency of heating and evaporation. On the other hand, the weight change caused by the evaporation of seawater is used to cause the heat-generating belt 21 to be replaced, thereby ensuring that the replenishment of seawater and the replacement of the heat-generating belt 21 are carried out in a regular manner, effectively enhancing the degree of automation of the heat-collecting evaporation process.

[0059] As a preferred embodiment of the present invention, a salt discharge groove 5 is provided on the evaporating dish 11. A closing plate 51 is installed on the evaporating dish 11 by elastic lifting of a spring. In the initial state, the closing plate 51 blocks the salt discharge groove 5. A lever 52 is fixedly installed in the mounting groove 2. When the slider 31 moves to the end of the ascending section, the lever 52 pushes the closing plate 51 and the salt discharge groove 5 to open.

[0060] The side of the closing plate 51 close to the salt discharge tank 5 is made of elastic sealing material.

[0061] To further accelerate the discharge of salt components and impurities from the evaporating dish 11, as the seawater in the evaporating dish 11 continues to concentrate, when the liquid level in the evaporating dish 11 reaches a predetermined height, the closing plate 51 gradually contacts the lever 52 as the evaporating dish 11 rises. As the evaporating dish 11 continues to rise, the lever 52 blocks the closing plate 51 until the closing plate 51 descends, thereby discharging the highly concentrated seawater from the evaporating dish 11. As the seawater is discharged, the weight of the evaporating dish 11 decreases at an accelerated rate. Driven by the support spring 28, the evaporating dish 11 rises at an accelerated rate. When the slider 31 moves obliquely along the top of the ascending section of the guide groove, the closing plate 51 separates from the lever 52, and the closing plate 51 re-closes the salt discharge groove 5, allowing seawater to be re-injected into the evaporating dish 11 through the through groove 22, achieving seawater circulation. By discharging the concentrated seawater, not only can the amount of seawater re-injected be increased, but the rate at which salt components accumulate in the evaporating dish 11 can also be reduced, thereby maintaining the continuous operation of the solar thermal desalination device.

[0062] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A solar heat-collecting seawater desalination device, comprising a suspension base, an evaporation dish, a heat-collecting cover, and a guide pipe; The suspension seat is provided with a mounting groove, the evaporating dish is mounted in the mounting groove, the evaporating dish is a container with an open top, the heat collecting cover is mounted at the opening of the evaporating dish, the heat collecting cover is provided with a guide pipe, and the guide pipe is externally connected to a water storage device; Its characteristics are: It also includes a circulating heating mechanism, which is installed on the evaporating dish and includes a heating belt, a circulating roller and a driving member; The heat-generating belt is a flexible belt made of light-absorbing and heat-generating material. Through grooves are provided on both sides of the heat-collecting cover, and the heat-generating belt extends to the interior of the evaporating dish through the through grooves. The heat-generating belt is fixedly connected end to end to form a ring structure, the bottom of the installation groove is open, the heat-generating belt extends to the bottom of the evaporating dish and contacts the seawater through the bottom opening of the installation groove; The evaporating dish is rotatably mounted with symmetrically arranged circulation rollers, the heat-generating belt passes through the gaps of the circulation rollers, and the circulation rollers are used to drive the heat-generating belt to circulate; The driving member is composed of a transmission wheel, a rack and a support spring; The transmission wheel is fixedly mounted on the end of the circulating roller, and the rack is fixedly mounted on one side of the mounting groove; A support spring is fixedly installed at the bottom of the mounting groove, the evaporating dish is located above the support spring, and the rack is located on the rising path of the transmission wheel; A guide groove is provided on the suspension seat, the guide groove is conductively connected to the mounting groove, sliders are fixedly installed on both sides of the evaporating dish, the sliders extend into the guide groove, the guide groove includes at least a descending section and an ascending section, the top end of the ascending section and the bottom end of the descending section are both inclined, the ascending section and the descending section are conductively connected at both ends, and the guide groove is annular as a whole; A lifting plate is fixedly mounted on the top of the support spring, and evenly distributed balls are rotatably mounted on the lifting plate; A drainage groove is provided on the heat collecting cover, the through groove is conductively connected to the drainage groove, an assembly plate is fixedly installed in the installation groove, and a drainage hole is provided on the drainage groove. When the slider moves along the descending section, the assembly plate always blocks the drainage hole.

2. A solar thermal desalination device according to claim 1, characterized in that: The heat collecting cover is composed of a mounting ring and a condenser. The mounting ring is fixedly mounted on the evaporating dish. The condenser is fixedly mounted inside the mounting ring. The condenser is a convex lens and extends to the bottom of the evaporating dish.

3. The solar thermal desalination device according to claim 1, characterized in that: The through grooves are all U-shaped grooves, and the opening height of the through grooves on the outer side of the evaporating dish is higher than the opening height of the through grooves on the inner side of the evaporating dish.

4. The solar thermal desalination device according to claim 1, characterized in that: The edge of the suspension seat is designed to be arc-shaped, and the heat-generating belt extends into the drain hole.

5. The solar thermal desalination device according to claim 4, characterized in that: The evaporating dish is provided with a salt discharge groove, and a closing plate is installed on the evaporating dish by elastic lifting of a spring. In the initial state, the closing plate blocks the salt discharge groove. A shift rod is fixedly installed in the installation groove. When the slider moves to the end of the ascending section, the shift rod pushes the closing plate and the salt discharge groove to open.

6. The solar thermal desalination device according to claim 5, characterized in that: The side of the closing plate close to the salt discharge tank is made of elastic sealing material.

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