Energy-saving seawater desalination device

Abstract

The present application relates to the technical field of seawater desalination treatment, and particularly relates to an energy-saving seawater desalination device, which comprises a reverse osmosis filter core and an energy recovery device; the energy recovery device is provided with a recovery cavity; a rotor assembly and two isolation assemblies are rotationally arranged in the recovery cavity; the two isolation assemblies are symmetrically arranged about the center of the recovery cavity; the rotor assembly and the two isolation assemblies jointly seal and separate the recovery cavity into two raw water cavities and two waste water cavities; the center of the rotor assembly is provided with a center cavity, and a switching valve assembly is movably arranged in the center cavity; the rotor assembly is provided with a waste water channel for connecting the center cavity and the waste water cavity; the switching valve assembly is configured to control the two waste water channels to be alternately communicated with the center cavity; the residual pressure of high-pressure concentrated brine discharged by the reverse osmosis filter core directly acts on raw water in the raw water cavity to pressurize the raw water, so that energy recovery of high-pressure waste water can be continuously realized, the recovery efficiency is high, the energy consumption per unit of water production is reduced, and the energy cost can be significantly reduced in long-term operation.

Description

Technical Field

[0001] This invention relates to the field of seawater desalination technology, and in particular to an energy-saving seawater desalination device. Background Technology

[0002] Reverse osmosis is widely used in civilian, commercial and emergency seawater desalination fields due to its advantages such as high desalination efficiency, strong water quality adaptability and convenient operation. Its core principle is to apply pressure higher than the osmotic pressure of seawater to the raw seawater through a pressurization device, so that water molecules can pass through the reverse osmosis membrane to separate salt and water and finally produce fresh water.

[0003] However, reverse osmosis desalination technology uses a high-power, high-pressure pump to pressurize the raw seawater to the required operating pressure. The pressurized raw water flows into the reverse osmosis membrane pressure vessel. The fresh water that passes through the reverse osmosis membrane becomes the product water, while the concentrated brine that does not pass through the reverse osmosis membrane is discharged under high pressure. The discharged high-pressure wastewater still has potential energy, and direct discharge would lead to the waste of this energy, resulting in high energy consumption in the current reverse osmosis seawater desalination process. Summary of the Invention

[0004] The purpose of this invention is to overcome the above-mentioned shortcomings and provide an energy-saving seawater desalination device.

[0005] To achieve the above objectives, the specific solution of the present invention is as follows:

[0006] An energy-saving seawater desalination device includes a reverse osmosis filter element and an energy recovery device; the energy recovery device is provided with a recovery chamber; a rotor assembly and two isolation assemblies are rotatably arranged inside the recovery chamber; the two isolation assemblies are symmetrically arranged about the center of the recovery chamber; the rotor assembly and the two isolation assemblies together seal and divide the recovery chamber into two adjacent raw water chambers and two adjacent wastewater chambers.

[0007] The rotor assembly has a central cavity at its center that is connected to the wastewater outlet of the reverse osmosis filter element. A switching valve assembly is movably installed in the central cavity. The rotor assembly has wastewater channels corresponding to the two wastewater chambers, which connect the central cavity and the wastewater chambers respectively. The switching valve assembly is configured to control the two wastewater channels to alternately connect with the central cavity.

[0008] The energy-saving seawater desalination unit also includes a first inlet pipe, a second inlet pipe, and a drain pipe; the two raw water chambers are configured to alternately connect to one end of the first inlet pipe and alternately connect to one end of the second inlet pipe; the other end of the second inlet pipe is connected to the inlet of the reverse osmosis filter element; the two wastewater chambers are configured to alternately connect to the drain pipe.

[0009] Furthermore, the energy recovery device of the present invention includes a cylinder, a top cover, and a bottom cover; the top cover is sealed at the top of the cylinder; the bottom cover is sealed at the bottom of the cylinder; the cylinder, the top cover, and the bottom cover together form the recovery chamber.

[0010] Furthermore, the rotor assembly of the present invention includes a recycling rotor; the recycling rotor includes a central body and two blade portions symmetrically disposed on the outer peripheral wall of the central body; the central body is rotatably connected to the bottom cover; the central body is provided with the central cavity; each blade portion is provided with the wastewater channel;

[0011] Each blade section has a first driving member on its sidewall facing the raw water chamber; each blade section has a second driving member on its sidewall facing the wastewater chamber.

[0012] One of the isolation components is provided with a raw water channel connected to a second inlet pipe; a first valve core is provided in the raw water channel; another isolation component is provided with a drainage channel connected to a drain pipe; a second valve core is provided in the drainage channel; the first valve core, under the action of a first driving component, causes the two raw water chambers to alternately connect with the raw water channel; the second valve core, under the action of a second driving component, causes the two wastewater chambers to alternately connect with the wastewater channel.

[0013] Furthermore, the central body and the two blade portions are integrally formed in this invention.

[0014] Furthermore, in this invention, both the first driving element and the second driving element are permanent magnets; both the first valve core and the second valve core are magnetic valve cores.

[0015] Furthermore, the outer wall of the magnetic valve core is fitted with a sealing friction ring.

[0016] Furthermore, each isolation component includes an isolation body; the isolation body is in movable sealing contact with the outer peripheral wall of the central body; the isolation body located between the two raw water chambers is provided with an inlet channel and the raw water channel; the inlet channel is connected to the first inlet pipe; one-way valve plates are respectively provided in the inlet channel corresponding to the positions of the two raw water chambers; the isolation body located between the two wastewater chambers is provided with a drainage channel.

[0017] Furthermore, the top cover has a central column protruding from its center and extending into the central cavity; the outer wall of the central column has a switching groove; and the two wastewater channels are arranged vertically.

[0018] The switching valve assembly includes a switching valve body with multiple communicating holes; the switching valve body is movably and sealingly fitted onto the outer wall of the central column; the inner wall of the switching valve body is elastically floating with a switching pin; the switching pin is movably embedded in a switching groove; the bottom of the switching valve body is provided with a first driving part; the top of the switching valve body is provided with a second driving part.

[0019] The switching valve assembly further includes a first push rod disposed on the bottom wall of the central cavity and a switching ring disposed at the opening of the central cavity; the bottom surface of the switching ring is provided with a second push rod; when the first push rod cooperates with the first driving part, the switching valve body moves upward to connect the wastewater channel located below with the central cavity; when the second push rod cooperates with the second driving part, the switching valve body moves downward to connect the wastewater channel located above with the central cavity.

[0020] Furthermore, the switching groove of the present invention includes an upper inclined groove and a lower inclined groove; the lower end of the upper inclined groove is connected to the upper end of the lower inclined groove; the depth of the upper inclined groove gradually increases upward from the connection between the upper and lower inclined grooves; the depth of the lower inclined groove gradually increases downward from the connection between the upper and lower inclined grooves; a spring is connected between the switching pin and the inner wall of the switching valve body; when the first push rod disengages from the first driving part, the switching pin moves upward past the connection between the upper and lower inclined grooves; when the second push rod disengages from the second driving part, the switching pin moves downward past the connection between the upper and lower inclined grooves.

[0021] The beneficial effects of this invention are as follows: This invention alternately receives high-pressure wastewater and releases residual pressure through two wastewater chambers, and controls the flow direction of wastewater with the help of a switching valve assembly. This allows the residual pressure of the high-pressure concentrated brine discharged from the reverse osmosis filter to directly pressurize the raw water in the raw water chamber, thereby enabling continuous energy recovery of high-pressure wastewater with high recovery efficiency. This helps to reduce the energy consumption per unit of produced water, and long-term operation can significantly reduce energy costs. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the present invention;

[0023] Figure 2 This is a cross-sectional schematic diagram of the present invention;

[0024] Figure 3 yes Figure 2 A magnified view of a section at point I;

[0025] Figure 4 This is a schematic diagram of the structure of the present invention after concealing the reverse osmosis filter element, top cover, and cylinder.

[0026] Figure 5 This is a structural schematic diagram of the present invention from another perspective after concealing the reverse osmosis filter element, top cover, and cylinder.

[0027] Figure 6This is a cross-sectional schematic diagram of the energy recovery device of the present invention after the switching valve body is moved upward;

[0028] Figure 7 This is an exploded view of the energy recovery device of the present invention;

[0029] Figure 8 This is a schematic diagram of the structure of the energy recovery device of the present invention after the top cover is hidden;

[0030] Figure 9 This is a schematic diagram of the structure of the recyclable rotor of the present invention;

[0031] Figure 10 This is a schematic diagram of the structure of the isolation component of the present invention;

[0032] Figure 11 This is a schematic diagram of the switching valve assembly of the present invention;

[0033] Explanation of reference numerals in the attached drawings: 1. Reverse osmosis filter element; 21. Cylinder body; 22. Top cover; 221. Central column; 222. Upper inclined groove; 223. Lower inclined groove; 23. Bottom cover; 24. Rotor assembly; 241. Recovery rotor; 2411. Central body; 2412. Blade section; 2413. Central cavity; 2414. Wastewater channel; 242. First drive component; 243. Second drive component; 25. Isolation assembly; 251. Isolation body; 2511. Raw water channel; 2512. 2513. First valve core component; 2514. Drainage channel; 2515. Second valve core component; 2516. Water inlet channel; 2517. One-way valve plate; 28. Raw water chamber; 29. ​​Wastewater chamber; 20. Switching valve assembly; 21. Switching valve body; 22. First drive unit; 23. Second drive unit; 24. Switching pin; 25. First push rod; 26. Switching ring; 27. Second push rod; 28. Spring; 29. ​​First water inlet pipe; 20. Second water inlet pipe; 20. Drainage pipe. Detailed Implementation

[0034] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, but this is not to limit the scope of the invention to this.

[0035] Reference Figures 1 to 11As shown in the figure, the energy-saving seawater desalination device described in this embodiment specifically includes a reverse osmosis filter element 1 and an energy recovery device. The energy recovery device, as the core of energy exchange, is provided with a recovery chamber, which is a sealed hollow cavity used to realize the coupled operation of raw water pressurization and wastewater residual pressure recovery. A rotor assembly 24 and two isolation components 25 are rotatably arranged inside the recovery chamber. The two isolation components 25 are symmetrically arranged about the center of the recovery chamber. The side walls of the isolation components 25 are sealed and abut against the inner wall of the recovery chamber and the outer wall of the rotor assembly 24. Through the circumferential rotation of the rotor assembly 24 and the fixed isolation effect of the isolation components 25, the rotor assembly 24 and the two isolation components 25 together seal and divide the recovery chamber into two adjacent raw water chambers 26 and two adjacent wastewater chambers 27.

[0036] The rotor assembly 24 has a central cavity 2413 at its center, which is connected to the wastewater outlet of the reverse osmosis filter element 1. It can continuously receive the wastewater (i.e., high-pressure concentrated brine) discharged when the reverse osmosis filter element 1 is working. A switching valve assembly 28 is movably installed in the central cavity 2413. The rotor assembly 24 has wastewater channels 2414 corresponding to the two wastewater chambers 27, which connect the central cavity 2413 and the wastewater chamber 27 respectively. The switching valve assembly 28 is configured to control the two wastewater channels 2414 to alternately connect with the central cavity 2413. That is, when one wastewater channel 2414 is connected to the central cavity 2413, the other wastewater channel 2414 is in a closed state, ensuring that the high-pressure wastewater can enter the different wastewater chambers 27 in sequence to release residual pressure.

[0037] The energy-saving seawater desalination unit also includes a first inlet pipe 3, a second inlet pipe 4, and a drain pipe 5. The two raw water chambers 26 are configured to alternately connect to one end of the first inlet pipe 3 (to receive raw seawater) and alternately connect to one end of the second inlet pipe 4 (to deliver pressurized raw seawater). When the rotor assembly 24 rotates to a certain angle, one of the raw water chambers 26 connects to the first inlet pipe 3 to inject raw seawater, while the other raw water chamber 26 connects to the second inlet pipe 4 to output pressurized raw water. As the rotor assembly 24 continues to rotate, the connections of the two raw water chambers 26 are interchanged. This enables continuous input and pressurized output of raw seawater. The other end of the second inlet pipe 4 is connected to the inlet of the reverse osmosis filter element 1, forming a pressurized raw water transport path of "raw water chamber 26 → second inlet pipe 4 → inlet of reverse osmosis filter element 1", ensuring that the raw water pressure entering the reverse osmosis filter element 1 meets the desalination requirements. The two wastewater chambers 27 are configured to alternately connect to the drain pipe 5: when one wastewater chamber 27 receives high-pressure wastewater and releases residual pressure, the other wastewater chamber 27 connects to the drain pipe 5 to discharge low-pressure wastewater after releasing residual pressure. The continuous discharge of low-pressure wastewater is achieved through alternating connections.

[0038] Specifically, such as Figure 8As shown, for ease of explanation of this embodiment, one raw water chamber 26 is defined as raw water chamber A 26, and the other raw water chamber 26 is defined as raw water chamber B 26. Similarly, one wastewater chamber 27 is defined as wastewater chamber A 27, and the other wastewater chamber 27 is defined as wastewater chamber B 27. In actual use, the energy-saving seawater desalination unit described in this embodiment connects the wastewater channel 2414, which is connected to wastewater chamber A 27, with the central chamber 2413. The high-pressure wastewater generated by the reverse osmosis filter element 1 is discharged into wastewater chamber A 27 through its wastewater outlet, thereby driving the rotor assembly. Rotation 24 increases the volume of wastewater chamber A 27 while decreasing the volume of wastewater chamber B 27. At this time, wastewater chamber B 27 is connected to drain pipe 5, which discharges low-pressure wastewater after releasing residual pressure. The volume of raw water chamber A 26 decreases, which increases the pressure of the raw water in raw water chamber A 26, achieving a pressurization effect. The water enters the booster pump through the second inlet pipe 4. After secondary pressurization by the booster pump, it reaches the working pressure of the reverse osmosis membrane and is pumped into the reverse osmosis filter element 1 for filtration. At the same time, the volume of raw water chamber B 26 increases, thereby drawing in low-pressure raw water through the first inlet pipe 3.

[0039] Until the switching valve assembly 28 connects the wastewater channel 2414, which is connected to wastewater chamber B 27, with the central chamber 2413, the high-pressure wastewater generated by the reverse osmosis filter element 1 is discharged into wastewater chamber B 27 through its wastewater outlet. This drives the rotor assembly 24 to rotate in the opposite direction, causing the volume of wastewater chamber A 27 to decrease while the volume of wastewater chamber B 27 increases. At this time, wastewater chamber A 27 is connected to the drain pipe 5, which discharges the low-pressure wastewater after releasing residual pressure. The volume of raw water chamber B 26 also decreases, causing the volume of raw water chamber B 26 to decrease. The pressure of the raw water in chamber 6 increases, achieving a pressurization effect. It then enters the booster pump through the second inlet pipe 4. After secondary pressurization by the booster pump, it reaches the working pressure of the reverse osmosis membrane and is pumped into the reverse osmosis filter element 1 for filtration. At the same time, the volume of raw water chamber A 26 increases, thereby drawing in low-pressure raw water through the first inlet pipe 3. As the switching valve assembly 28 continuously connects the two wastewater channels 2414 alternately with the central chamber 2413, the rotor assembly 24 rotates continuously in both directions, thereby continuously realizing the energy recovery of high-pressure wastewater residual pressure.

[0040] In this embodiment, two wastewater chambers 27 alternately receive high-pressure wastewater and release residual pressure. With the help of the switching valve assembly 28, the flow direction of wastewater is controlled, so that the residual pressure of the high-pressure concentrated brine discharged from the reverse osmosis filter element 1 directly acts on the raw water in the raw water chamber 26 to pressurize it. This can continuously realize the energy recovery of high-pressure wastewater with high recovery efficiency, thereby helping to reduce the energy consumption per unit of produced water. Long-term operation can significantly reduce energy costs.

[0041] Reference Figure 1 , Figure 2 as well as Figures 6 to 8As shown, in some embodiments of the energy-saving seawater desalination device described in this embodiment, the energy recovery device includes a cylinder 21, a top cover 22, and a bottom cover 23. The top cover 22 is sealed to the top of the cylinder 21 by a sealing ring, and the bottom cover 23 is sealed to the bottom of the cylinder 21 by a sealing ring. The cylinder 21, top cover 22, and bottom cover 23 are fixedly connected by bolts, forming the recovery chamber together. All three components have a double-sealing structure at their joints to prevent leakage of high-pressure seawater. This embodiment uses a split-type sealing design to improve maintenance convenience and facilitate assembly.

[0042] Reference Figure 2 , Figures 4 to 10 As shown, in some embodiments of the energy-saving seawater desalination device described in this embodiment, the rotor assembly 24 includes a recovery rotor 241; the recovery rotor 241 includes a central body 2411 and two blade portions 2412 centrally symmetrically disposed on the outer peripheral wall of the central body 2411; the central body 2411 is rotatably connected to the bottom cover 23 to ensure that the rotor assembly 24 can rotate stably; the interior of the central body 2411 is hollow, forming the central cavity 2413; each blade portion 2412 is provided with a wastewater channel 2414, which extends along the length direction of the blade portion 2412 to realize the communication between the central cavity 2413 and the wastewater cavity 27; each blade portion 2412 has a first driving member 242 on the side wall facing the original water cavity 26, each The blade portion 2412 has a second driving member 243 on its side wall facing the wastewater chamber 27, which is used to provide driving force for channel switching; one of the isolation components 25 (near the raw water chamber 26) has a raw water channel 2511 connected to the second water inlet pipe 4; the raw water channel 2511 has a first valve core 2512; another isolation component 25 (near the wastewater chamber 27) has a drainage channel 2513 connected to the drain pipe 5; the drainage channel 2513 has a second valve core 2514; the first valve core 2512, under the action of the first driving member 242, causes the two raw water chambers 26 to alternately connect with the raw water channel 2511; the second valve core 2514, under the action of the second driving member 243, causes the two wastewater chambers 27 to alternately connect with the wastewater channel 2414.

[0043] Specifically, initially, the switching valve assembly 28 connects the wastewater channel 2414, which is connected to wastewater chamber A 27, to the central chamber 2413. The second drive member 243 connects the second valve core 2514 to wastewater chamber B 27 with the drainage channel 2513. The first drive member 242 connects the first valve core 2512 to raw water chamber A 26 with the second inlet pipe 4. When the high-pressure wastewater drives the recovery rotor 241 to rotate, the corresponding blade portion 2412 pressurizes the raw water in raw water chamber A 26. The pressurized raw water is discharged into the reverse osmosis filter element 1 through the second connecting pipe. Raw water chamber B 26 is connected to the first inlet pipe 3. Low-pressure raw water enters raw water chamber B 26 through the first inlet pipe 3. When the switching valve assembly 28 connects the wastewater channel 2414, which is connected to wastewater chamber A 27, to the central chamber 2413, the second drive member 243 connects the second valve core 2514 to wastewater chamber B 27 with the drainage channel 2513. When the wastewater channel 2414 connected to the wastewater chamber 27 is connected to the central chamber 2413, the second driving member 243 causes the second valve core 2514 to connect the wastewater chamber 27 A to the drainage channel 2513, and the first driving member 242 causes the first valve core 2512 to connect the raw water chamber 26 B to the second inlet pipe 4. When the high-pressure wastewater drives the recovery rotor 241 to rotate in the opposite direction, the corresponding blade part 2412 pressurizes the raw water in the raw water chamber 26 B. The pressurized raw water enters the booster pump through the second inlet pipe 4. After being pressurized twice by the booster pump to reach the working pressure of the reverse osmosis membrane, it is pumped to the reverse osmosis filter element 1. The raw water chamber 26 A is connected to the first inlet pipe 3, and the low-pressure raw water enters the raw water chamber 26 A through the first inlet pipe 3. This cycle repeats continuously, causing wastewater chambers A and B to alternately connect with drainage channel 2513 and with the wastewater outlet of reverse osmosis filter element 1, and causing raw water chambers A and B to alternately connect with the first inlet pipe 3 and with the second inlet pipe 4, thereby achieving continuous energy recovery of high-pressure wastewater.

[0044] Reference Figure 9 As shown, in some embodiments of the energy-saving seawater desalination device described in this embodiment, the central body 2411 and the two blade sections 2412 are integrally formed. Specifically, it can be manufactured by precision casting or CNC machining. This design can eliminate the splicing gap between the central body 2411 and the blade sections 2412, avoid medium leakage under high pressure conditions, and at the same time improve the overall structural strength of the rotor assembly 24 and extend the service life of the equipment.

[0045] In some embodiments of the energy-saving seawater desalination device described in this example, the first driving component 242 and the second driving component 243 are both permanent magnets (such as neodymium iron boron strong magnets); the first valve core component 2512 and the second valve core component 2514 are both magnetic valve cores (such as ferrite valve cores). This example achieves contactless driving through the magnetic attraction between the permanent magnet and the magnetic valve core, reducing mechanical wear and lowering the maintenance frequency.

[0046] In some embodiments of the energy-saving seawater desalination device described in this example, a sealing friction ring is fitted onto the outer wall of the magnetic valve core to further improve the sealing effect between the valve core and the channel. Specifically, the sealing friction ring is made of polytetrafluoroethylene or perfluoroether rubber, which has the characteristics of being resistant to seawater corrosion and having a low coefficient of friction, thus preventing seawater from flowing through the gap between the valve core and the channel.

[0047] Reference Figure 2 , Figures 4 to 8 ,as well as Figure 10 As shown, in some embodiments of the energy-saving seawater desalination device described in this embodiment, each isolation component 25 includes an isolation body 251. The isolation body 251 is in movable sealing contact with the outer peripheral wall of the central body 2411. The isolation body 251 is made of engineering plastic (such as PEEK), and its inner sidewall is in movable sealing contact with the outer peripheral wall of the central body 2411 through a lip sealing structure, which takes into account both sealing performance and rotational flexibility. The isolation body 251 located between the two raw water chambers 26 is provided with a water inlet channel 2515 and the raw water channel 2511. The inlet channel 2515 is connected to the first inlet pipe 3; one-way valve plates 2516 (such as rubber one-way valves) are respectively installed in the inlet channel 2515 at the positions corresponding to the two raw water chambers 26. The one-way valve plates 2516 only allow raw seawater to flow into the raw water chamber 26 from the inlet channel 2515, preventing the high-pressure seawater in the raw water chamber 26 from flowing back and ensuring pressurization efficiency; the drainage channel 2513 is provided in the isolation body 251 located between the two wastewater chambers 27. The movement of the second valve core 2514 controls the alternating opening and closing of the drainage channel 2513 and the two wastewater chambers 27 to achieve orderly discharge of wastewater.

[0048] Reference Figure 2 , Figure 3 , Figure 6 as well as Figure 7As shown, in some embodiments of the energy-saving seawater desalination device described in this embodiment, the top cover 22 has a central column 221 protruding from its center and extending into the central cavity 2413; the outer wall of the central column 221 has a switching groove; the two wastewater channels 2414 are arranged vertically and vertically, adapted to the moving trajectory of the switching valve assembly 28; the switching valve assembly 28 includes a switching valve body 281 with multiple connecting holes; the switching valve body 281 is movably and sealingly fitted onto the outer wall of the central column 221; the inner wall of the switching valve body 281 is elastically and floatingly provided with a switching pin 282; the switching pin 282 is movably embedded in the switching groove; the bottom of the switching valve body 281 is provided with a first drive... The switching valve assembly 28 includes a moving part 2811; a second driving part 2812 is provided on the top of the switching valve body 281; the switching valve assembly 28 also includes a first push rod 283 provided on the bottom wall of the central cavity 2413 and a switching ring 284 provided at the opening of the central cavity 2413; a second push rod 285 is provided on the bottom surface of the switching ring 284; when the first push rod 283 cooperates with the first driving part 2811, the switching valve body 281 moves upward to connect the wastewater channel 2414 located below with the central cavity 2413; when the second push rod 285 cooperates with the second driving part 2812, the switching valve body 281 moves downward to connect the wastewater channel 2414 located above with the central cavity 2413. In some embodiments of the energy-saving seawater desalination device described in this embodiment, the switching groove includes an upper inclined groove 222 and a lower inclined groove 223; the lower end of the upper inclined groove 222 is connected to the upper end of the lower inclined groove 223; the depth of the upper inclined groove 222 gradually increases upward from the connection point between the upper inclined groove 222 and the lower inclined groove 223; the depth of the lower inclined groove 223 gradually increases downward from the connection point between the upper inclined groove 222 and the lower inclined groove 223; a spring 286 is connected between the switching pin 282 and the inner wall of the switching valve body 281; when the first push rod 283 disengages from the first drive part 2811, the switching pin 282 moves upward past the connection point between the upper inclined groove 222 and the lower inclined groove 223; when the second push rod 285 disengages from the second drive part 2812, the switching pin 282 moves downward past the connection point between the upper inclined groove 222 and the lower inclined groove 223.

[0049] Specifically, when the recovery rotor 241 drives the first push rod 283 to rotate until the first drive part 2811 contacts the first push rod 283, as the recovery rotor 241 rotates, the first push rod 283 abuts against the first drive part 2811, pushing the switching valve body 281 to move upward along the central column 221, and the switching pin 282 to move upward along the lower inclined groove 223. The switching pin 282 gradually retracts inward, and the spring 286 is compressed until the switching pin 282 moves upward past the upper inclined groove. When the upper inclined groove 222 connects to the lower inclined groove 223, the spring 286 pushes the switching pin 282 to extend into the upper inclined groove 222. At the same time, the first push rod 283 disengages from the first drive part 2811. At this time, the switching valve body 281 continues to move upward under the combined action of the switching pin 282, the spring 286, and the upper inclined groove 222 until the wastewater channel 2414 located below is connected to the central cavity 2413. At this time, the switching valve body 281 blocks the wastewater channel located above. 2414; Then, the recovery rotor 241 rotates in the reverse direction. When the second push rod 285 contacts and engages with the second drive unit 2812, the second push rod 285 and the second drive unit 2812 abut against each other, pushing the switching valve body 281 downward. The switching pin 282 moves downward along the upper inclined groove 222, and the switching pin 282 compresses the spring 286 inward until the switching pin 282 moves upward to pass the connection between the upper inclined groove 222 and the lower inclined groove 223. At this point, the spring 286 pushes the switching pin. 282 extends into the lower inclined groove 223, while the second push rod 285 disengages from the second drive unit 2812. At this time, the switching valve body 281 continues to move downward under the combined action of the switching pin 282, the spring 286, and the lower inclined groove 223 until the upper wastewater channel 2414 is connected to the central cavity 2413. At this time, the switching valve body 281 blocks the lower wastewater channel 2414. This cycle is repeated to achieve automatic alternating switching of the two wastewater channels 2414.

[0050] The above description is only a preferred embodiment of the present invention. Therefore, any equivalent changes or modifications made to the structure, features and principles described in the claims of this patent application are included within the protection scope of this patent application.

Claims

1. An energy-saving seawater desalination device, characterized in that, The device includes a reverse osmosis filter element and an energy recovery device; the energy recovery device is provided with a recovery chamber; a rotor assembly and two isolation assemblies are rotatably arranged inside the recovery chamber; the two isolation assemblies are symmetrically arranged about the center of the recovery chamber; the rotor assembly and the two isolation assemblies together seal and divide the recovery chamber into two adjacent raw water chambers and two adjacent wastewater chambers. The rotor assembly has a central cavity at its center that is connected to the wastewater outlet of the reverse osmosis filter element. A switching valve assembly is movably installed in the central cavity. The rotor assembly has wastewater channels corresponding to the two wastewater chambers, which connect the central cavity and the wastewater chambers respectively. The switching valve assembly is configured to control the two wastewater channels to alternately connect with the central cavity. The energy-saving seawater desalination unit also includes a first inlet pipe, a second inlet pipe, and a drain pipe; the two raw water chambers are configured to alternately connect to one end of the first inlet pipe and alternately connect to one end of the second inlet pipe; the other end of the second inlet pipe is connected to the inlet of the reverse osmosis filter element; the two wastewater chambers are configured to alternately connect to the drain pipe. The energy recovery device includes a cylinder, a top cover, and a bottom cover; the top cover is sealed at the top of the cylinder; the bottom cover is sealed at the bottom of the cylinder; the cylinder, top cover, and bottom cover together form the recovery chamber; The top cover has a central column protruding from its center and extending into the central cavity; the outer wall of the central column has a switching groove; the two wastewater channels are arranged vertically. The switching valve assembly includes a switching valve body with multiple communicating holes; the switching valve body is movably and sealingly fitted onto the outer wall of the central column; the inner wall of the switching valve body is elastically floating with a switching pin; the switching pin is movably embedded in a switching groove; the bottom of the switching valve body is provided with a first driving part; the top of the switching valve body is provided with a second driving part. The switching valve assembly further includes a first push rod disposed on the bottom wall of the central cavity and a switching ring disposed at the opening of the central cavity; the bottom surface of the switching ring is provided with a second push rod; when the first push rod cooperates with the first driving part, the switching valve body moves upward to connect the wastewater channel located below with the central cavity; when the second push rod cooperates with the second driving part, the switching valve body moves downward to connect the wastewater channel located above with the central cavity.

2. The energy-saving seawater desalination device according to claim 1, characterized in that, The rotor assembly includes a recycling rotor; the recycling rotor includes a central body and two blade sections symmetrically disposed on the outer peripheral wall of the central body; the central body is rotatably connected to a bottom cover; the central body is provided with the central cavity; each blade section is provided with the wastewater channel; Each blade section has a first driving member on its sidewall facing the raw water chamber; each blade section has a second driving member on its sidewall facing the wastewater chamber. One of the isolation components is provided with a raw water channel connected to a second inlet pipe; a first valve core is provided in the raw water channel; another isolation component is provided with a drainage channel connected to a drain pipe; a second valve core is provided in the drainage channel; the first valve core, under the action of a first driving component, causes the two raw water chambers to alternately connect with the raw water channel; the second valve core, under the action of a second driving component, causes the two wastewater chambers to alternately connect with the wastewater channel.

3. The energy-saving seawater desalination device according to claim 2, characterized in that, The central body and the two blade sections are integrally formed.

4. The energy-saving seawater desalination device according to claim 2, characterized in that, Both the first driving component and the second driving component are permanent magnets; both the first valve core component and the second valve core component are magnetic valve cores.

5. The energy-saving seawater desalination device according to claim 4, characterized in that, The outer wall of the magnetic valve core is fitted with a sealing friction ring.

6. The energy-saving seawater desalination device according to claim 2, characterized in that, Each isolation component includes an isolation body; the isolation body is in a movable sealing contact with the outer peripheral wall of the central body; the isolation body located between the two raw water chambers is provided with an inlet channel and the raw water channel; the inlet channel is connected to the first inlet pipe; one-way valve plates are respectively provided in the inlet channel at the positions corresponding to the two raw water chambers; the isolation body located between the two wastewater chambers is provided with a drainage channel.

7. The energy-saving seawater desalination device according to claim 1, characterized in that, The switching groove includes an upper inclined groove and a lower inclined groove; the lower end of the upper inclined groove is connected to the upper end of the lower inclined groove; the depth of the upper inclined groove gradually increases upward from the connection point between the upper and lower inclined grooves; the depth of the lower inclined groove gradually increases downward from the connection point between the upper and lower inclined grooves; a spring is connected between the switching pin and the inner wall of the switching valve body; when the first push rod disengages from the first drive part, the switching pin moves upward past the connection point between the upper and lower inclined grooves; When the second push rod disengages from the second drive unit, the switching pin moves downward past the connection between the upper and lower inclined grooves.

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