An apparatus for desalination of sea water using solar energy

Abstract

The application is suitable for the technical field of seawater desalination, and provides a device for seawater desalination by using solar energy, which comprises an evaporation box and a heat collecting tank for preheating seawater; a heat absorbing plate installed in the heat collecting tank for absorbing solar radiation energy and transferring heat to seawater; a heater fixedly installed in the evaporation box for heating seawater; a condensing pipe installed on one side of the evaporation box for condensing water vapor; a collecting box fixedly installed on one side of the evaporation box for collecting fresh water; and a refrigeration mechanism arranged on the collecting box for cooling fresh water. The device for seawater desalination by using solar energy provided by the scheme can make seawater heat up faster by reducing heat loss and strengthening heat transfer, shorten the preheating time, provide more favorable conditions for the evaporation process, and effectively improve the efficiency of seawater desalination.

Description

Technical Field

[0001] This invention belongs to the field of seawater desalination technology, and in particular relates to a device for seawater desalination using solar energy. Background Technology

[0002] Seawater desalination equipment refers to equipment specifically designed for desalinating seawater. Seawater desalination mainly employs two methods: distillation and reverse osmosis. Among these, distillation is the most common method. In the distillation process, the water in the seawater evaporates at high temperatures and then condenses to form fresh water.

[0003] Existing seawater desalination equipment typically employs direct high-temperature evaporation, which involves heating pretreated seawater to vaporize it at high temperatures, followed by collection of fresh water through a condensation device. However, this method requires a continuous supply of a large amount of heat energy to maintain the evaporation process, resulting in high energy consumption. Furthermore, due to the high specific heat capacity of seawater, the heating process is slow, leading to low evaporation efficiency. Summary of the Invention

[0004] This invention provides a device for seawater desalination using solar energy, aiming to solve the problems of high energy consumption, low efficiency, and easy scaling and corrosion of traditional seawater desalination equipment mentioned in the background art.

[0005] To solve the above problems, the present invention is implemented as follows: a device for seawater desalination using solar energy, comprising: an evaporation tank and a heat collection tank for preheating seawater; a heat absorption plate installed in the heat collection tank for absorbing solar radiation energy and transferring heat to the seawater; a heater fixedly installed in the evaporation tank for heating the seawater; a condenser pipe installed on one side of the evaporation tank for condensing water vapor; a collection tank fixedly installed on one side of the evaporation tank for collecting fresh water; and a refrigeration mechanism disposed on the collection tank for cooling the fresh water.

[0006] Preferably, the heat collection tank is provided with a heat insulation layer, and a transparent cover plate is installed on the top of the heat collection tank to restrict the free flow of air and reduce heat loss. A heat conduction frame is installed on the top of the inner wall of the transparent cover plate to enhance heat transfer, and the support rod of the heat conduction frame is inserted into the seawater.

[0007] Preferably, a transfer pump is provided on one side of the evaporator for transporting seawater from the heat collection tank to the evaporator, and the two ends of the transfer pump are respectively connected to the water inlet pipe of the evaporator and the drain pipe of the heat collection tank.

[0008] Preferably, a stirring rod for stirring seawater and heating it evenly is rotatably installed inside the evaporator. A motor is fixedly installed on the top of the evaporator, and the output shaft of the motor is fixedly connected to the top of the stirring rod. A scraper for preventing scale buildup on the inner wall of the evaporator is installed on the stirring rod, and the scraper is in rotatable contact with the inner wall of the evaporator.

[0009] Preferably, the refrigeration mechanism includes: a partition fixedly installed inside the collection box, the partition separating the collection box to form a refrigeration chamber and a drainage chamber; a refrigeration plate installed on one side of the refrigeration chamber for cooling fresh water; fins respectively installed on both sides of the refrigeration plate, the fins located inside the collection box being inserted into the water; a serpentine tube wound around the condenser tube for cooling the condenser tube, both ends of the serpentine tube extending into the collection box, one end of the serpentine tube extending into the refrigeration chamber; and a water pump installed at the top of the drainage chamber, the water pump being fixedly connected to the other end of the serpentine tube, and the suction end of the water pump extending into the refrigeration chamber.

[0010] Preferably, a plurality of baffles are installed inside the condenser tube, the baffles are stacked in layers, and the baffles divide the condenser tube to form a serpentine cavity. The upper surface of the baffles is inclined, and a drain outlet is provided on the baffles. A mesh frame is fixedly installed on one side of the collection box, and the mesh frame covers the fins located outside the collection box. A cooling fan for heat dissipation fins and cooling plates is installed inside the mesh frame.

[0011] Preferably, the evaporator is provided with a water level monitoring mechanism for monitoring the water level inside the evaporator. The water level monitoring mechanism includes: a connecting box fixedly installed on one side of the evaporator, the connecting box being connected to the evaporator; and a float level gauge installed on the connecting box for monitoring the seawater level inside the evaporator.

[0012] Preferably, a set of switching devices for starting and stopping the delivery pump is fixedly installed inside the connection box. A T-shaped contact rod is installed on the float of the float level gauge. The T-shaped contact rod is adapted to the set of switching devices. A set of protective covers for waterproofing the switching devices is fixedly installed inside the connection box. The set of protective covers covers the set of switching devices respectively. A waterproof membrane is installed on the opening of the protective cover.

[0013] Preferably, a rotating rod is rotatably mounted on the top of the evaporator, a housing is fixedly mounted on the top of the inner wall of the condenser, an impeller for assisting in discharging water vapor into the condenser is rotatably mounted on one side of the housing, differential gears are fixedly mounted on the shaft and rotating rod of the impeller, chains are sleeved on the two differential gears, and bevel gears are fixedly sleeved on the other end of the stirring rod and the rotating rod, with the two bevel gears meshing.

[0014] Preferably, the top of the evaporator is equipped with a protective cover for protecting the motor and differential wheel.

[0015] Compared with related technologies, the equipment for seawater desalination using solar energy provided by this invention has the following beneficial effects:

[0016] Compared with existing technologies, the solar-powered seawater desalination equipment provided in this solution preheats seawater through heat absorption plates, raising the temperature of the seawater before it enters the evaporation tank. This overcomes the disadvantages of seawater's high specific heat capacity and slow temperature rise, accelerating the temperature rise of the seawater in the evaporation tank, thereby improving evaporation efficiency and shortening the seawater desalination time. By discharging the hot seawater in the heat collection tank into the evaporation tank for circulating seawater desalination, the continuity and stability of the seawater desalination process are ensured, enabling continuous production of fresh water to meet water demand.

[0017] In summary, the solar energy desalination equipment of the present invention reduces heat loss and enhances heat transfer, enabling seawater to heat up faster, shortening the preheating time, and providing more favorable conditions for the evaporation process, thus effectively improving the efficiency of seawater desalination. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the main structure of a device for seawater desalination using solar energy provided by the present invention;

[0019] Figure 2 This is a flowchart of a device for seawater desalination using solar energy, provided by the present invention.

[0020] Figure 3 This is a schematic diagram of the main cross-sectional structure of the evaporator provided by the present invention;

[0021] Figure 4 This is a schematic diagram of the main cross-sectional structure of the heat collection trough provided by the present invention;

[0022] Figure 5 This is a schematic diagram of the main sectional view of the connecting box provided by the present invention;

[0023] Figure 6 This is a schematic diagram of the main sectional view of the partition and drain outlet provided by the present invention;

[0024] Figure 7 for Figure 3 An enlarged structural diagram of part A shown in the figure;

[0025] Figure 8 for Figure 5 An enlarged structural diagram of part B shown in the figure;

[0026] Figure 9 for Figure 3 An enlarged structural diagram of section C shown in the figure;

[0027] Figure 10 for Figure 3 The diagram shows an enlarged view of part D.

[0028] Reference numerals: 1. Evaporator; 2. Heat collector; 3. Absorber plate; 4. Heater; 5. Condenser; 6. Collection box; 7. Insulation layer; 8. Transparent cover; 9. Heat conduction frame; 10. Transfer pump; 11. Drain pipe; 12. Stirring rod; 13. Motor; 14. Scraper; 15. Baffle; 16. Cooling element; 17. Fin; 18. Serpentine tube; 19. Water pump; 20. Baffle plate; 21. Grid frame; 22. 23. Cooling fan; 24. Drain outlet; 25. Connection box; 26. Float level gauge; 27. Switchgear; 28. T-shaped contact rod; 29. ​​Protective cover; 30. Waterproof membrane; 31. Rotating rod; 32. Housing; 33. Impeller; 34. Differential gear; 35. Chain; 36. Bevel gear; 37. Protective cover; 38. Exhaust pipe; 39. Dust cover; 40. Connecting frame; 41. Connecting plate; 42. Spring. Detailed Implementation

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein in the specification of the application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or foregoing drawings are used to distinguish different objects, not to describe a particular order; the terms "inner," "outer," "left," and "right" indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention.

[0030] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0031] This invention provides a device for seawater desalination using solar energy, such as... Figure 1-10As shown, the equipment for seawater desalination using solar energy includes: an evaporator 1 and a heat collection tank 2 for preheating seawater; a heat absorption plate 3 installed in the heat collection tank 2 for absorbing solar radiation energy and transferring heat to the seawater; a heater 4 fixedly installed in the evaporator 1 for heating the seawater; a condenser pipe 5 installed on one side of the evaporator 1 for condensing water vapor; a collection tank 6 fixedly installed on one side of the evaporator 1 for collecting fresh water; and a refrigeration mechanism provided on the collection tank 6 for cooling the fresh water.

[0032] In this embodiment, the floating photovoltaic system supplies power to this device, thus achieving self-powered operation. The heat absorber 3 absorbs solar radiation and transfers heat to the seawater flowing through the collector tank 2, preheating the seawater. The preheated seawater enters the evaporator 1, where the heater 4 further heats the seawater, generating steam. The steam enters the condenser tube 5 from the evaporator 1, and the refrigeration mechanism on the collection tank 6 cools the condenser tube 5, causing the steam to condense into fresh water. The condensed fresh water flows into the collection tank 6 for collection and is then discharged through the collection tank 6 to proceed to the next process. When the seawater evaporates to a certain amount in the evaporator 1, the concentrated seawater is discharged from the evaporator 1 and enters the salt production process. Simultaneously, the heat collector... The preheated hot seawater in tank 2 is discharged into evaporator 1 for circulating seawater desalination. By using heat absorber plate 3 to absorb solar radiation energy to preheat the seawater, the large amount of heat energy required for continuous supply during direct high-temperature evaporation is reduced, thus lowering energy consumption and improving energy efficiency. Preheating the seawater by heat absorber plate 3 raises its temperature before entering evaporator 1, overcoming the disadvantages of seawater's high specific heat capacity and slow temperature rise, and accelerating the temperature rise of the seawater in evaporator 1, thereby improving evaporation efficiency and shortening the seawater desalination time. By discharging the hot seawater in collector tank 2 into evaporator 1 for circulating seawater desalination, the continuity and stability of the seawater desalination process are ensured, enabling continuous production of fresh water to meet water demand.

[0033] In a further preferred embodiment of the present invention, a heat insulation layer 7 is provided inside the heat collection tank 2, and a transparent cover plate 8 is installed on the top of the heat collection tank 2 to restrict the free flow of air and reduce heat loss. A heat conduction frame 9 is installed on the top of the inner wall of the transparent cover plate 8 to enhance heat transfer, and the support rod of the heat conduction frame 9 is inserted into the seawater.

[0034] In this embodiment, the heat insulation layer 7 effectively prevents heat loss to the outside through the side wall of the heat collection tank 2; at the same time, the transparent cover plate 8 restricts the free flow of air in the heat collection tank 2, reducing heat loss caused by air convection, while allowing solar radiation to pass through and reach the heat absorber plate 3, but blocking the heat absorber plate 3 from radiating heat to the outside. After the heat absorber plate 3 absorbs heat, the heat is directly transferred to the surrounding seawater. In addition, the heat conduction frame absorbs the heat on the transparent cover plate 8 and quickly conducts it to the seawater through the heat conduction frame 9, which enhances the heat transfer process from the heat absorber plate 3 to the seawater, making the seawater heat up faster. With the setting of the heat insulation layer 7 and the transparent cover plate 8, the heat loss to the outside is effectively reduced from the side wall and top of the heat collection tank 2, respectively, so that more solar radiation energy can be absorbed by the seawater in the heat collection tank 2, improving energy utilization efficiency and reducing the additional energy required to maintain the seawater temperature.

[0035] In a further preferred embodiment of the present invention, a delivery pump 10 for transporting seawater from the heat collection tank 2 to the evaporation tank 1 is provided on one side of the evaporation tank 1. The two ends of the delivery pump 10 are respectively connected to the water inlet pipe 11 of the evaporation tank 1 and the drain pipe of the heat collection tank 2.

[0036] In this embodiment, after the seawater in the solar collector 2 has been preheated, the transfer pump 10 is started. Its two ends are connected to the inlet pipe 11 of the evaporator 1 and the drain pipe of the solar collector 2, respectively. Through this connection, the preheated hot seawater in the solar collector 2 is drawn out from the drain pipe and transported to the evaporator 1 through the inlet pipe 11. The transfer pump 10 enables the seawater transport between the solar collector 2 and the evaporator 1 to be automated and continuous. During the seawater desalination process, the preheated hot seawater in the solar collector 2 can be transported to the evaporator 1 in a timely manner, ensuring that there is always a sufficient amount of seawater in the evaporator 1 for evaporation, maintaining the continuity and stability of the seawater desalination process, and improving the overall operating efficiency and water production capacity of the equipment. By using the transfer pump 10, the solar-preheated seawater is quickly transported to the evaporator 1, avoiding heat loss caused by the preheated seawater staying in the solar collector 2 for a long time.

[0037] In a further preferred embodiment of the present invention, a stirring rod 12 for stirring seawater and heating it evenly is rotatably installed inside the evaporator 1. A motor 13 is fixedly installed on the top of the evaporator 1, and the output shaft of the motor 13 is fixedly connected to the top end of the stirring rod 12. A scraper 14 for preventing scale buildup on the inner wall surface of the evaporator 1 is installed on the stirring rod 12, and the scraper 14 is in rotatable contact with the inner wall of the evaporator 1.

[0038] In this embodiment, the motor 13 at the top of the evaporator 1 is started, and its output shaft drives the stirring rod 12 to rotate inside the evaporator 1. The stirring rod 12 stirs the seawater in the evaporator 1, causing the seawater to continuously roll and mix, thereby absorbing the heat emitted by the heater 4 evenly, avoiding local overheating or overcooling of the seawater, and improving the seawater heating rate and evaporation efficiency.

[0039] During the rotation of the stirring rod 12, the scraper 14 removes scale, impurities, and other contaminants adhering to the inner wall of the evaporator 1, preventing these substances from accumulating and forming a thick scale layer. This ensures the cleanliness of the inner wall of the evaporator 1 and maintains good heat conduction performance. Under stirring and uniform heating, the seawater continuously heats up and generates steam. The steam enters the condenser tube 5 from the evaporator 1 and condenses to form fresh water. The stirring rod 12 further agitates the seawater, ensuring thorough mixing and uniform heating within the evaporator 1. This avoids the problems of localized overheating and rapid vaporization, or localized slow vaporization due to uneven heating of the seawater. It improves the overall heating rate and evaporation efficiency of the seawater, shortens the desalination time, and increases the water production of the equipment. The scraper 14 removes scale and impurities from the inner wall of the evaporator 1, preventing scale layer formation.

[0040] In a further preferred embodiment of the present invention, the refrigeration mechanism includes: a partition 15 fixedly installed inside the collection box 6, the partition 15 separating the collection box 6 to form a refrigeration chamber and a drainage chamber; a refrigeration plate 16 installed on one side of the refrigeration chamber for cooling fresh water; fins 17 respectively installed on both sides of the refrigeration plate 16, the fins 17 located inside the collection box 6 being inserted into the water; a serpentine tube 18 wound around the condenser tube 5 for cooling the condenser tube 5, both ends of the serpentine tube 18 extending into the collection box 6, one end of the serpentine tube 18 extending into the refrigeration chamber; and a water pump 19 installed at the top of the drainage chamber, the water pump 19 being fixedly connected to the other end of the serpentine tube 18, and the suction end of the water pump 19 extending into the refrigeration chamber.

[0041] In this embodiment, steam enters the condenser tube 5 from the evaporator 1. The cooling plate 16 cools the fresh water in the cooling chamber. The fins 17, located in the collection box 6 and inserted into the water, increase the contact area between the cooling plate 16 and the water, enhancing the cooling effect and lowering the water temperature in the cooling chamber. After the water pump 19 starts, it draws out the low-temperature cold water in the cooling chamber and sends it to one end of the serpentine tube 18 that is wound around the condenser tube 5. The cold water flows in the serpentine tube 18, cooling the condenser tube 5 and lowering its temperature. The steam comes into contact with the low-temperature condenser tube 5 in the condenser tube 5 and quickly condenses into fresh water.

[0042] The condensed freshwater flows into the drain chamber of the collection tank 6 for collection, and can then be discharged to the next process. The water that has completed heat exchange in the serpentine tube 18 flows back to the refrigeration chamber and is cooled again by the cooling plate 16, forming a circulating refrigeration system that continuously cools the condenser tube 5. By using the cooling plate 16 to cool the water in the collection tank 6 and driving the cold water to circulate in the serpentine tube 18 by the water pump 19, the cooling capacity is fully utilized. Compared with the traditional direct refrigeration method, this circulating refrigeration system can more accurately control the transfer of cooling capacity, reduce the waste of cooling capacity, reduce energy consumption, improve energy utilization efficiency, and reduce the cost of seawater desalination.

[0043] In a further preferred embodiment of the present invention, a plurality of partitions 20 are installed inside the condenser tube 5. The partitions 20 are stacked vertically and separate the condenser tube 5 to form a serpentine cavity. The upper surface of the partition plate 15 is inclined and a drain outlet 23 is provided on the partition plate 15. A mesh frame 21 is fixedly installed on one side of the collection box 6. The mesh frame 21 covers the fins 17 located outside the collection box 6. A cooling fan 22 for heat dissipation fins 17 and cooling plates 16 is installed inside the mesh frame 21.

[0044] In this embodiment, the cooling fan 22 inside the grid frame 21 is activated to dissipate heat from the fins 17 and the cooling plates 16, preventing them from overheating due to prolonged operation, ensuring the cooling efficiency of the cooling plates 16 and the heat dissipation effect of the fins 17, and maintaining the stable operation of the refrigeration mechanism. The condenser tube 5 is divided into a serpentine cavity by the upper and lower stacked partitions 20 inside the condenser tube 5, which changes the flow path of steam in the condenser tube 5, slows down its flow speed, prolongs its flow time, and allows the steam to come into more full contact with the low-temperature inner wall of the condenser tube 5, resulting in more thorough heat transfer and a significant improvement in the condensation effect, thereby increasing the water production of the equipment.

[0045] In a further preferred embodiment of the present invention, the evaporator 1 is provided with a water level monitoring mechanism for monitoring the water level inside the evaporator 1. The water level monitoring mechanism includes: a connecting box 24 fixedly installed on one side of the evaporator 1, the connecting box 24 being connected to the evaporator 1; and a float level gauge 25 installed on the connecting box 24 for monitoring the seawater level inside the evaporator 1.

[0046] In this embodiment, when the seawater level in the evaporator 1 is lower than the set threshold of the float level gauge 25 due to evaporation, the control system receives a low water level signal and automatically starts the relevant program to discharge the remaining concentrated seawater in the evaporator 1 so that the subsequent delivery pump 10 can deliver new preheated seawater to the evaporator 1 to start a new round of seawater desalination. Through the design of the water level monitoring mechanism connected to the evaporator 1 via the connecting box 24, and the real-time monitoring function of the float level gauge 25, the water level in the evaporator 1 can be accurately monitored.

[0047] The model number of the float level gauge 25 is CHRD float level gauge.

[0048] In a further preferred embodiment of the present invention, a set of switching devices 26 for starting and stopping the delivery pump 10 is fixedly installed inside the connecting box 24. A T-shaped contact rod 27 is installed on the float of the float level gauge 25. The T-shaped contact rod 27 is adapted to the set of switching devices 26. A set of protective covers 28 for waterproofing the switching devices 26 is fixedly installed inside the connecting box 24. The set of protective covers 28 covers the set of switching devices 26 respectively. A waterproof membrane 29 is installed on the opening of the protective cover 28.

[0049] In this embodiment, when the delivery pump 10 continues to work and seawater continuously enters the evaporation tank 1, causing the water level to exceed the set threshold of the float level gauge 25, the float rises, and the T-shaped contact rod 27 rises accordingly and touches the switch device 26 fixedly installed in the connection box 24, triggering the switch device 26 to act and send a signal to the equipment control system. The control system immediately shuts down the delivery pump 10 and stops delivering seawater to the evaporation tank 1 to prevent the seawater level from exceeding the condenser tube 5, which would affect the normal condensation of steam and the operation of the equipment. When the seawater level in the evaporation tank 1 falls below the set threshold of the float level gauge 25 due to evaporation, the float descends, and the T-shaped contact rod 27 disengages from the switch device 26. If the system determines that the conditions for discharging concentrated seawater and preparing for a new round of seawater desalination are met, the delivery pump 10 can be restarted to deliver new preheated seawater after the concentrated seawater is discharged.

[0050] To ensure the normal operation of the switchgear 26 in humid environments or even in environments where it may come into contact with small amounts of moisture, a waterproof membrane 29 is installed on the opening of the protective cover 28. The waterproof membrane 29 allows the T-shaped contact rod 27 to trigger the switchgear 26 normally, while preventing moisture and water droplets from entering the protective cover 28, thus avoiding short circuits or damage to the switchgear 26 due to moisture and ensuring its stability and reliability.

[0051] In a further preferred embodiment of the present invention, a rotating rod 30 is rotatably mounted on the top of the evaporator 1, a housing 31 is fixedly mounted on the top of the inner wall of the condenser 5, an impeller 32 for assisting in discharging water vapor into the condenser 5 is rotatably mounted on one side of the housing 31, a differential wheel 33 is fixedly mounted on the shaft of the impeller 32 and the rotating rod 30, a chain 34 is sleeved on the two differential wheels 33, and a bevel gear 35 is fixedly sleeved on the other end of the stirring rod 12 and the rotating rod 30, and the two bevel gears 35 mesh with each other.

[0052] In this embodiment, the motor 13 drives the stirring rod 12 to rotate inside the evaporator 1, stirring the seawater to ensure uniform heating, accelerating the temperature rise of the seawater and generating steam. Both the stirring rod 12 and the rotating rod 30 have bevel gears 35 fixedly fitted at their other ends, and the two bevel gears 35 mesh with each other. Therefore, when the stirring rod 12 rotates, it drives the rotating rod 30 to rotate synchronously through the meshing transmission of the bevel gears 35. Differential gears 33 are fixedly installed on the shafts of the rotating rod 30 and the impeller 32 rotatably mounted on one side of the inner wall of the condenser tube 5 top shell 31. Chains 34 are fitted onto the two differential gears 33. Due to the design of the differential gears 33, the rotational speed of the impeller 32 is much higher than the rotational speed of the stirring rod 12. When the rotating rod 30 rotates, it drives the impeller 32 to rotate at high speed through the transmission of the differential wheel 33 and the chain 34. When the impeller 32 rotates at high speed, it will generate a negative pressure at the inlet of the condenser tube 5, thereby helping to quickly and efficiently discharge the water vapor generated in the evaporator 1 into the condenser tube 5, improving the steam discharge efficiency. The rotating rod 30 is driven by the rotation of the stirring rod 12, and then the impeller 32 is driven to rotate at high speed through the transmission of the differential wheel 33 and the chain 34. The negative pressure generated by the rotation of the impeller 32 is used to quickly and efficiently discharge the water vapor generated in the evaporator 1 into the condenser tube 5, improving the steam discharge efficiency, reducing the residence time of steam in the evaporator 1, reducing the possibility of steam escape, and allowing more steam to enter the condenser tube 5 for condensation, thereby improving the condensation effect and water production of the equipment.

[0053] In a further preferred embodiment of the present invention, a protective cover 36 for protecting the motor 13 and the differential wheel 33 is installed on the top of the evaporator 1.

[0054] In this embodiment, the protective cover 36 effectively blocks the intrusion of harmful substances such as dust, impurities, and moisture from the external environment, preventing these substances from causing corrosion, wear, or short circuits to the internal circuits and transmission structures of the components.

[0055] To further improve the performance of this device, in addition to the above-mentioned solutions, this solution also includes the following embodiments:

[0056] In another embodiment of the present invention, an exhaust pipe 37 for discharging gas is fixedly installed on the top of the collection box 6, and a dust cover 38 is provided on the top of the exhaust pipe 37.

[0057] In this embodiment, during the steam condensation process, some non-condensable gases (such as air, trace amounts of incompletely condensed steam, etc.) inevitably enter the collection tank 6 along with the fresh water. As the liquid level in the collection tank 6 rises, the pressure inside the tank changes, and the non-condensable gases gradually accumulate in the upper space of the collection tank 6. When the pressure inside the collection tank 6 reaches a certain level or according to the gas discharge cycle set by the equipment, the exhaust pipe 37 fixedly installed on the top of the collection tank 6 begins to function, discharging the non-condensable gases inside the collection tank 6 to the external environment, thereby maintaining a stable pressure inside the collection tank 6 and ensuring the fresh water... For the normal operation of the collection and subsequent processing, the top of the exhaust pipe 37 is covered with a dust cover 38. During the process of the exhaust pipe 37 discharging non-condensable gases, the dust cover 38 can prevent dust, impurities and other external environmental factors from entering the exhaust pipe 37 and the collection box 6, thus avoiding contamination of the fresh water in the collection box 6 by these impurities. It also prevents impurities from clogging the exhaust pipe 37 and affecting the normal discharge of gas. The exhaust pipe 37 installed on the top of the collection box 6 can discharge the non-condensable gases generated during the steam condensation process in a timely manner, effectively preventing these gases from accumulating in the collection box 6 and causing pressure to rise.

[0058] In another embodiment of the present invention, a connecting frame 39 is fixedly installed inside the exhaust pipe 37, a connecting plate 40 is placed on the connecting frame 39, a sealing ring is sleeved on the connecting plate 40, and the sealing ring is in contact with the inner wall of the connecting frame 39. A spring 41 is installed inside the exhaust pipe 37, and the top end of the spring 41 is fixedly connected to the connecting plate 40.

[0059] In this embodiment, when the pressure inside the collection box 6 reaches a certain level, the pressure acts on the connecting plate 40 placed on the connecting frame 39 inside the exhaust pipe 37, overcoming the tension of the spring 41 and pushing the connecting plate 40 upward. The connecting plate 40 moves upward away from the connecting frame 39, and at the same time, the spring 41 is stretched, forming a gap between the connecting plate 40 and the connecting frame 39. Non-condensable gases are discharged to the external environment through this gap via the exhaust pipe 37 to maintain stable pressure inside the collection box 6. As the non-condensable gases are discharged, the pressure inside the collection box 6 gradually decreases. When the pressure is insufficient to overcome the tension of the spring 41, the spring 41 contracts, pulling the connecting plate 40 downward to re-engage tightly with the connecting frame 39, sealing the exhaust pipe 37 and preventing external impurities from entering the collection box 6. Under the action of the spring 41, the connecting plate 40 can flexibly switch between the sealing and exhaust states. Under normal pressure, the connecting plate 40 fits tightly against the connecting frame 39, sealing the exhaust pipe 37 and preventing external impurities from entering the collection box 6. When the pressure increases and exhaust is required, it can be quickly lifted to release the gas. This flexible switching mechanism reduces the accumulation time of non-condensable gases in the collection box 6, improves the efficiency of steam condensation and freshwater collection, and also ensures that the freshwater collection process is not disturbed by external impurities.

[0060] In summary, compared with related technologies, this equipment reduces heat loss and enhances heat transfer, enabling seawater to heat up faster, shortening the preheating time, providing more favorable conditions for the evaporation process, and effectively improving the efficiency of seawater desalination.

[0061] It should be understood, in the several embodiments provided in this application, that the disclosed apparatus may be implemented in other ways.

[0062] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit the scope of protection of the invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on these embodiments, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art can still combine, add, delete, or otherwise adjust the features of the various embodiments of the present invention according to the circumstances without conflict or creative effort, thereby obtaining different technical solutions that do not fundamentally depart from the concept of the present invention. These technical solutions also fall within the scope of protection of the present invention.

Claims

1. A device for seawater desalination using solar energy, characterized in that, include: Evaporator and heat collection tank for preheating seawater; A heat-absorbing plate installed inside the solar collector trough to absorb solar radiation energy and transfer heat to seawater; A heater that is fixedly installed inside the evaporator for heating seawater; A condenser tube installed on one side of the evaporator for condensing water vapor; A collection box for collecting fresh water is fixedly installed on one side of the evaporator. A refrigeration mechanism for cooling fresh water is installed on the collection tank; The top of the heat collection tank is equipped with a transparent cover plate to restrict free airflow and reduce heat loss. A heat-conducting frame is installed on the top of the inner wall of the transparent cover plate to enhance heat transfer. The support rod of the heat-conducting frame is inserted into the seawater. The evaporator is equipped with a rotating stirring rod for stirring the seawater and heating it evenly. The stirring rod is equipped with a scraper to prevent scale buildup on the inner wall of the evaporator, and the scraper is in rotatable contact with the inner wall of the evaporator. A serpentine tube is wound around the condenser tube to cool it down. Both ends of the serpentine tube extend into the collection box, and one end of the serpentine tube extends into the refrigeration chamber. The condenser tube is equipped with several baffles, which are stacked one on top of the other, and the baffles separate the inside of the condenser tube to form a serpentine cavity. A rotating rod is rotatably mounted on the top of the evaporator, and a housing is fixedly mounted on the top of the inner wall of the condenser. An impeller for assisting in discharging water vapor into the condenser is rotatably mounted on one side of the housing. Differential gears are fixedly mounted on the shaft and rotating rod of the impeller, and chains are sleeved on the two differential gears. A bevel gear is fixedly sleeved on the other end of the stirring rod and the rotating rod, and the two bevel gears mesh with each other.

2. The equipment for seawater desalination using solar energy as described in claim 1, characterized in that, The heat collection tank is equipped with a heat insulation layer.

3. The equipment for seawater desalination using solar energy as described in claim 1, characterized in that, A pump is provided on one side of the evaporator to transport seawater from the heat collection tank to the evaporator. The two ends of the pump are connected to the water inlet pipe of the evaporator and the drain pipe of the heat collection tank, respectively.

4. The equipment for seawater desalination using solar energy as described in claim 1, characterized in that, A motor is fixedly installed on the top of the evaporator, and the output shaft of the motor is fixedly connected to the top of the stirring rod.

5. The equipment for seawater desalination using solar energy as described in claim 1, characterized in that, The refrigeration mechanism includes: A partition is fixedly installed inside the collection box, which separates the collection box into a cooling chamber and a drainage chamber; A cooling plate installed on one side of the cooling chamber for cooling fresh water; Fins are installed on both sides of the cooling plate, and the fins located in the collection box are inserted into the water. A water pump is installed at the top of the drainage chamber, the water pump is fixedly connected to the other end of the serpentine pipe, and the suction end of the water pump extends into the cooling chamber.

6. The equipment for seawater desalination using solar energy as described in claim 5, characterized in that, The upper surface of the partition is inclined, and a drain outlet is provided on the partition. A mesh frame is fixedly installed on one side of the collection box. The mesh frame covers the fins located outside the collection box, and a cooling fan for heat dissipation fins and cooling plates is installed inside the mesh frame.

7. The equipment for seawater desalination using solar energy as described in claim 3, characterized in that, The evaporator is equipped with a water level monitoring mechanism for monitoring the water level inside the evaporator, the water level monitoring mechanism comprising: A connecting box is fixedly installed on one side of the evaporator, and the connecting box is connected to the evaporator; A float level gauge is installed on the connection box to monitor the seawater level in the evaporation tank.

8. The equipment for seawater desalination using solar energy as described in claim 7, characterized in that, A set of switching devices for starting and stopping the delivery pump is fixedly installed inside the connection box. A T-shaped contact rod is installed on the float of the float level gauge. The T-shaped contact rod is adapted to the set of switching devices. A set of protective covers for waterproofing the switching devices is fixedly installed inside the connection box. The set of protective covers covers the set of switching devices respectively. A waterproof membrane is installed on the opening of the protective cover.

9. The equipment for seawater desalination using solar energy as described in claim 1, characterized in that, Its features are, The top of the evaporator is equipped with a protective cover to protect the motor and differential wheel.

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