An electrodialysis (EDI) water treatment device for producing urea for vehicles and a treatment method thereof

Abstract

The application relates to the technical field of electrodeionization, in particular to an electrodeionization (EDI) water treatment device for producing vehicle urea and a treatment method thereof, which comprises a first sealed shell and a second sealed shell, a closed chamber is formed in the first sealed shell and the second sealed shell, a freshwater chamber, an anion exchange membrane, a concentrated water chamber, a cation exchange membrane and multiple groups of cathode tubes are sequentially arranged in the closed chamber, multiple groups of connecting tables are connected with two groups of cathode tubes, the two groups of cathode tubes are diagonally arranged on the connecting tables, the multiple groups of connecting tables are sequentially overlapped in the vertical direction, and when the connecting tables at the upper end and the lower end are locked, the other connecting tables can be in the locked state, a storage groove is provided with an energy storage structure, the energy storage structure is connected with a groove wheel, a sliding part is provided with a protruding abutting part, the protruding abutting part is matched with the groove wheel, the sliding part has a tendency to be kept at the formed end part, and the cathode tubes can be conveniently disassembled.

Description

Technical Field

[0001] This invention relates to the field of electro-deionization technology, specifically to an electro-deionization (EDI) water treatment device and method for producing automotive urea. Background Technology

[0002] The key components of automotive urea are high-purity urea and ultrapure deionized water. The two are mixed in a precise ratio to ensure that the automotive urea can operate efficiently in the SCR system.

[0003] In the production process of ultrapure deionized water, the raw material (water) electro-deionization (EDI) treatment unit is an important piece of equipment. Its internal structure mainly consists of an outer shell, a desalination chamber, an anion exchange membrane, a concentrate chamber, a cation exchange membrane, and a cathode plate. The main task of the cathode plate is to provide electrons, drive cation migration, and maintain an alkaline environment for continuous resin regeneration. The contact area between the cathode plate and the raw material determines the electron transfer rate. To improve this rate, the current practice is to use cathode tubes instead of traditional cathode plates to obtain a larger contact area. However, regardless of whether cathode plates or cathode tubes are used, the problem of scaling needs to be solved, i.e., regular disassembly and cleaning.

[0004] Although the cathode tube increases the contact area with the raw materials and improves the reaction rate, setting as many cathode tubes as possible in a limited space will result in a small spacing between the cathode tubes. Moreover, most of these cathode tubes are integrated into the same module, which leads to dead corners during descaling. If the cathode tubes are set up separately, it will increase the workload of disassembly. In addition, the installation of each cathode tube must ensure the sealing after installation, which requires a high level of process. Summary of the Invention

[0005] The purpose of this invention is to provide an electro-deionization (EDI) water treatment device and method for producing automotive urea, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] An electro-deionization (EDI) water treatment device for producing automotive urea includes:

[0008] A first sealing shell and a second sealing shell, wherein a closed chamber is formed inside the first sealing shell and the second sealing shell, and a fresh water chamber, an anion exchange membrane, a concentrated water chamber, a cation exchange membrane and multiple sets of cathode tubes are sequentially arranged inside the closed chamber.

[0009] Also includes:

[0010] Multiple connecting platforms are detachably installed on the side of the second sealing shell. Two sets of cathode tubes are connected to the connecting platforms, and the two sets of cathode tubes are arranged diagonally on the connecting platforms.

[0011] Multiple sets of connecting platforms are sequentially overlapped in the vertical direction, and when the connecting platforms at the upper and lower ends are locked, the other connecting platforms can be locked. At this time, the outer sides of the multiple sets of connecting platforms are coplanar.

[0012] A hysteresis groove is provided on the side of the second sealing shell, and an energy storage structure is provided inside the hysteresis groove. A grooved wheel is connected to the energy storage structure.

[0013] A sliding member is slidably disposed in a guide groove formed on the side wall of the hysteresis groove. The sliding member is provided with a protruding abutment portion, which cooperates with the groove wheel to enable the sliding member to tend to stay at the formed end, and to lock the connecting platform at the upper and lower ends when the sliding member is at one end of its stroke.

[0014] As a further aspect of the present invention: a sealing ring is provided on one side of the second sealing shell, and when the connecting platform is inserted into the second sealing shell, the sealing ring is located between the second sealing shell and the connecting platform.

[0015] As a further embodiment of the present invention: the two ends of the connecting platform protruding from the side of the second sealing shell are respectively provided with a recess and an extension, and the recess and extension on two adjacent sets of the connecting platforms are abutted and adapted to each other.

[0016] As a further embodiment of the present invention: the energy storage structure includes multiple sets of hysteresis sleeves fixedly installed on the inner wall of the hysteresis tank, a telescopic shaft is slidably installed inside the hysteresis sleeve, a support plate is connected to one end of the telescopic shaft away from the hysteresis sleeve, and the groove wheel is rotatably installed on both sides of the support plate.

[0017] The energy storage structure also includes a cylindrical spring disposed inside the hysteresis sleeve, one end of which is connected to the telescopic shaft and the other end of which is connected to the inner wall of the hysteresis sleeve.

[0018] As a further embodiment of the present invention: the protruding abutment portion includes a first inclined surface and a second inclined surface disposed on the sliding member, the first inclined surface and the second inclined surface are connected, and an outward protrusion protruding toward the accommodative sleeve is formed at the connection between the two.

[0019] When the grooved wheel moves from the outer protrusion toward the first inclined surface or the second inclined surface, the cylindrical spring releases its elastic potential energy.

[0020] As a further embodiment of the present invention: a pressure roller is rotatably mounted on one end of the sliding member away from the hysteresis groove, and an inclined part is provided on the connecting platform at the end. The inclined part cooperates with the pressure roller to drive the connecting platform toward the second sealing shell.

[0021] As a further aspect of the present invention, it also includes:

[0022] A connecting pipe is connected to the second sealing shell, and an ultrafiltration structure is detachably installed inside the connecting pipe;

[0023] A flow path, connected to the connecting pipe, is used to clean the ultrafiltration structure when the flow path is open.

[0024] As a further embodiment of the present invention: the ultrafiltration structure includes an annular support disposed in a connecting tube, and the annular support is provided with two sets of protruding rings, the two sets of protruding rings abutting against the annular ultrafiltration membrane sleeved on the annular support;

[0025] The annular support is provided with a connection port, which can be connected to the feeding pipeline.

[0026] As a further embodiment of the present invention: a first control valve is provided at the connection between the connecting pipe and the second sealing shell;

[0027] The flow pipeline includes a second control valve, a fourth control valve connected to the connecting pipe, and a third control valve that passes through the connecting pipe and is connected to the connection port.

[0028] The second control valve is tangential to the inner wall of the connecting pipe, and the spiral guide plate disposed on the inner wall of the connecting pipe can guide the liquid entering the connecting pipe through the second control valve.

[0029] A method for treating water using the aforementioned electro-deionization (EDI) water treatment device for producing automotive urea includes the following steps:

[0030] Step 1: Connect the flow pipeline to the external pulse air compressor and external feeding device;

[0031] Step 2: Control the operation of the external feeding device. The raw material enters the connecting pipe and is filtered through the ultrafiltration structure. Then the raw material enters the closed chamber formed between the first sealing shell and the second sealing shell for electro-deionization treatment.

[0032] Step 3: After the raw material supply is scheduled for a certain time, the first control valve closes, and the external pulse air compressor and external feeding device operate in sequence to clean the ultrafiltration structure.

[0033] Step 4: When the electro-deionization efficiency decreases, push the sliding component to move, so that the locking state of the connecting platform is released. Then, pull out the connecting platform one by one, clean the dirt, and then reinstall it back into the second sealing shell.

[0034] Compared with the prior art, the beneficial effects of the present invention are:

[0035] By incorporating connecting platforms, hysteresis grooves, sliding components, and energy storage structures, the system firstly utilizes the recesses and extensions between adjacent sets of connecting platforms. After the connecting platforms are sequentially inserted into the second sealing shell, the connecting platforms at the upper and lower ends lock onto the connecting platform in the middle. This ensures a good fit between the connecting platforms at the upper and lower ends and the sides of the second sealing shell, while also ensuring a good fit between all connecting platforms in the middle and the sides of the second sealing shell, thereby improving the sealing performance between the connecting platforms and the second sealing shell. Secondly, the sliding component drives the pressure roller in two stable states. In these two states, the pressure roller does not obstruct the installation of the connecting platform, improving installation portability. Furthermore, when the pressure roller acts on the connecting platform, the connecting platform does not generate a reaction force that would drive the sliding component and pressure roller to move, further ensuring the sealing performance between the connecting platform and the second sealing shell and the stability of the connecting platform after installation.

[0036] By using the connecting pipes, ultrafiltration structure, and flow pipeline, the raw materials can be filtered again, preventing impurities from participating in the electro-deionization process and causing the cathode tube to scale up faster. At the same time, rinsing can remove the filtered impurities, ensuring the continuous and good filtration effect of the ultrafiltration structure. Attached Figure Description

[0037] Figure 1 A schematic diagram of one embodiment of an electro-deionization (EDI) water treatment device for producing automotive urea.

[0038] Figure 2 This is a schematic diagram of the structure of an electro-deionization (EDI) water treatment device for producing automotive urea from another angle in one embodiment.

[0039] Figure 3 An exploded view of the structure of an embodiment of an electro-deionization (EDI) water treatment device for producing automotive urea.

[0040] Figure 4 This is a schematic diagram of the structure of the second sealing shell in one embodiment of an electro-deionization (EDI) water treatment device for producing automotive urea.

[0041] Figure 5 for Figure 4 Enlarged view of the structure at point A in the middle.

[0042] Figure 6 An exploded view of the structure of the second sealing shell, connecting platform, and cathode tube in one embodiment of an electro-deionization (EDI) water treatment device for producing automotive urea.

[0043] Figure 7 This is a schematic diagram of the connecting platform in one embodiment of an electro-deionization (EDI) water treatment device for producing automotive urea.

[0044] Figure 8This is a schematic diagram of the sliding component and energy storage structure in one embodiment of an electro-deionization (EDI) water treatment device for producing automotive urea.

[0045] Figure 9 An exploded view of the sliding component and energy storage structure in one embodiment of an electro-deionization (EDI) water treatment device for producing automotive urea.

[0046] Figure 10 An exploded view of the connecting pipe and flow pipeline in one embodiment of an electro-deionization (EDI) water treatment device for producing automotive urea.

[0047] Figure 11 A cross-sectional view of the connecting pipe in one embodiment of an electro-deionization (EDI) water treatment device for producing automotive urea.

[0048] In the diagram: 1. First sealing shell; 2. Second sealing shell; 201. Hysteresis tank; 202. Guide tank; 3. Desalinated water chamber; 4. Anion exchange membrane; 5. Concentrated water chamber; 6. Cation exchange membrane; 7. Cathode tube; 8. Connecting platform; 801. Recess; 802. Extension; 803. Inclined part; 9. Sliding component; 901. First inclined surface; 902. Second inclined surface; 903. Protrusion; 10. Pressure roller; 11. Support plate; 12. Grooved wheel; 13. Telescopic shaft; 14. Cylindrical spring; 15. Hysteresis sleeve; 16. Sealing ring; 17. Connecting pipe; 18. Annular support; 1801. Convex ring; 1802. Connecting port; 19. First control valve; 20. Second control valve; 21. Third control valve; 22. Fourth control valve; 23. Annular ultrafiltration membrane. Detailed Implementation

[0049] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0050] Furthermore, elements in this invention are referred to as being "fixed to" or "set on" another element, which may be directly on the other element or may also include an intervening element. When an element is considered to be "connected" to another element, it may be directly connected to the other element or may also include an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementations.

[0051] Please see Figures 1-11 In this embodiment of the invention, an electro-deionization (EDI) water treatment device for producing automotive urea includes:

[0052] A first sealing shell 1 and a second sealing shell 2 are formed inside the first sealing shell 1 and the second sealing shell 2. A closed chamber is formed inside the first sealing shell 1 and the second sealing shell 2. A fresh water chamber 3, an anion exchange membrane 4, a concentrated water chamber 5, a cation exchange membrane 6 and multiple sets of cathode tubes 7 are arranged in sequence inside the closed chamber.

[0053] It also includes: multiple sets of connecting platforms 8, hysteresis grooves 201, and sliding components 9.

[0054] The multiple sets of connecting platforms 8 are detachably installed on the side of the second sealing shell 1. Two sets of cathode tubes 7 are connected to the connecting platforms 8, and the two sets of cathode tubes 7 are arranged diagonally on the connecting platforms 8.

[0055] In this embodiment, since each connecting platform 8 is equipped with two sets of cathode tubes 7, when one connecting platform 8 is pulled out, two cathode tubes 7 can be removed at the same time. This directly halves the number of cathode tubes 7 that need to be disassembled, reducing the workload of disassembly and installation to a certain extent. Furthermore, the two sets of cathode tubes 7 on the connecting platform 8 are arranged diagonally, which makes the distance between the two sets of cathode tubes 7 larger. This makes it easier to descale the cathode tubes 7 later and ensures the thoroughness of descaling, preventing dead corners in cleaning caused by the small distance between the cathode tubes 7.

[0056] A sealing ring 16 is provided on one side of the second sealing shell 2. When the connecting platform 8 is inserted into the second sealing shell 1, the sealing ring 16 is located between the second sealing shell 1 and the connecting platform 8.

[0057] By providing a sealing ring 16 between the second sealing shell 2 and the connecting platform 8, the sealing effect between the two can be ensured when the connecting platform 8 abuts against the side of the second sealing shell 2, thus preventing leakage.

[0058] Please see Figures 6-7 Multiple sets of connecting platforms 8 are sequentially overlapped in the vertical direction, and when the connecting platforms 8 at the upper and lower ends are locked, the other connecting platforms 8 can be locked. At this time, the outer sides of the multiple sets of connecting platforms 8 are coplanar.

[0059] The connecting platform 8 has a recessed portion 801 and an extension portion 802 at its two ends protruding from the side of the second sealing shell 2, and the recessed portion 801 and the extension portion 802 on two adjacent sets of the connecting platform 8 are abutted and adapted.

[0060] Specifically, in the application, both ends of the side of the second sealing shell 2 are provided with a hysteresis groove 201 and a sliding member 9. For multiple sets of connecting platforms 8, the number is odd. The connecting platform 8 in the middle is only provided with a recessed part 801. During the installation process, the connecting platform 8 in the middle is first inserted into the second sealing shell 2, and then the connecting platform 8 adjacent to it is installed. At this time, whether the upper connecting platform 8 or the lower connecting platform 8 is installed, the extension part 802 on the later installed connecting platform 8 can press against the recessed part 801 on the first installed connecting platform 8. After the last two sets of connecting platforms 8 at the upper and lower ends are installed, these two sets can form a mutually abutting and locking state for the connecting platforms 8 between them. At this time, when these last two sets of connecting platforms 8 are fixed and locked, all connecting platforms 8 can maintain a tight fit with the side of the second sealing shell 2. While ensuring the sealing performance, it is only necessary to lock the connecting platforms 8 at both ends, thereby greatly reducing the workload during installation and disassembly.

[0061] In detail, compared with the existing technology where each set of cathode tubes 7 is fastened with bolts, this device only needs to lock the two sets of connecting platforms 8 and can ensure the sealing between each set of connecting platforms 8 and the second sealing shell 2.

[0062] Please see Figures 5-6 , Figures 8-9 The hysteresis groove 201 is disposed on the side of the second sealing shell 1. An energy storage structure is disposed inside the hysteresis groove 201. A grooved wheel 12 is connected to the energy storage structure. The energy storage structure includes multiple sets of hysteresis sleeves 15 fixedly installed on the inner wall of the hysteresis groove 201. A telescopic shaft 13 is slidably installed inside the hysteresis sleeve 15. A support plate 11 is connected to one end of the telescopic shaft 13 away from the hysteresis sleeve 15. The grooved wheel 12 is rotatably installed on both sides of the support plate 11.

[0063] The energy storage structure also includes a cylindrical spring 14 disposed inside the hysteresis sleeve 15, one end of the cylindrical spring 14 being connected to the telescopic shaft 13 and the other end being connected to the inner wall of the hysteresis sleeve 15.

[0064] The sliding member 9 is slidably disposed in the guide groove 202 formed on the side wall of the hysteresis groove 201. The sliding member 9 is provided with a protruding abutment portion, which cooperates with the groove wheel 12, so that the sliding member 9 has a tendency to stay at the formed end, and can lock the connecting platform 8 at the upper and lower ends when the sliding member 9 is at one end of its stroke.

[0065] The protruding abutment includes a first inclined surface 901 and a second inclined surface 902 disposed on the sliding member 9. The first inclined surface 901 and the second inclined surface 902 are connected, and an outward protrusion 903 protruding toward the accommodating sleeve 15 is formed at the connection between the two.

[0066] When the grooved wheel 12 moves from the outer protrusion 903 toward the first inclined surface 901 or the second inclined surface 902, the cylindrical spring 14 releases elastic potential energy.

[0067] The sliding member 9 is rotatably mounted with a pressure roller 10 at one end away from the hysteresis groove 201. An inclined part 803 is provided on the connecting platform 8 at the end. The inclined part 803 cooperates with the pressure roller 10 and can drive the connecting platform 8 to move toward the second sealing shell 1.

[0068] In this embodiment, the cylindrical spring 14 is always compressed, so that under the elastic force provided by the cylindrical spring 14, the telescopic shaft 13 tends to drive the support plate 11 toward the sliding member 9, so that the grooved wheel 12 can be in a tight fit with the protruding abutment. Specifically, when the grooved wheel 12 is at the end of the second inclined surface 902 away from the outer protrusion 903, the grooved wheel 12 is in a locked state, and the sliding member 9 is in a locked state. In this state, the pressure roller 10 on the sliding member 9 is misaligned with the end connecting platform 8. At this time, when the connecting platform 8 is inserted into the side of the second sealing shell 2 in sequence, the pressure roller 10 is in a misaligned and locked state with the connecting platform 8, which makes the insertion of the connecting platform 8 more convenient. After all 8 parts are inserted, the sliding member 9 is moved. At this time, the protruding abutment part will move relative to the grooved wheel 12. Specifically, the grooved wheel 12 will move along the second inclined surface 902 toward the outward protrusion 903. During this process, the columnar spring 14 can be further compressed. When the grooved wheel 12 moves past the outward protrusion 903 and abuts against the first inclined surface 901, the columnar spring 14 can actively release its elastic potential energy to drive the sliding member 9 to move and make the pressure roller 10 move along the length direction of the side of the second sealing shell 2. At this time, the pressure roller 10 can cooperate with the inclined part 803 to apply pressure to the upper or lower connecting platform 8, so that the connecting platform 8 moves further toward the side of the second sealing shell 2 to press against the sealing ring 16, thereby ensuring the sealing between the connecting platform 8 and the second sealing shell 2.

[0069] When the sliding member 9 moves to abut against the side wall of the hysteresis groove 201, the cylindrical spring 14 is still in a compressed state, so that the sliding member 9 can remain locked in this state. At the same time, the pressure roller 10 moves to the vertical surface where the side of the connecting platform 8 is connected to the inclined part 803, that is, the pressure roller 10 abuts against the vertical surface. At this time, the pressure roller 10 only exerts pressure on the connecting platform 8 towards the second sealing shell 2, without any force in other directions. In this way, when the device is used and its internal pressure increases, the connecting platform 8 will not drive the pressure roller 10 to move due to the reverse force, so that the connecting platform 8 can be stably locked, ensuring the stability of the connecting platform 8 after installation and the sealing performance between it and the second sealing shell 2.

[0070] Based on the above configuration, firstly, by utilizing the recessed portion 801 and extension portion 802 between two adjacent sets of connecting platforms 8, after the connecting platforms 8 are inserted into the second sealing shell 2 in sequence, the connecting platforms 8 at the upper and lower ends can lock the connecting platform 8 in the middle. This ensures that the connecting platforms 8 at the upper and lower ends have a good fit with the sides of the second sealing shell 2, and also ensures that all the connecting platforms 8 in the middle have a good fit with the sides of the second sealing shell 2, thereby improving the sealing performance between the connecting platforms 8 and the second sealing shell 2. Secondly, the sliding member 9 drives the pressure roller 10 to have two stable states. In these two states, it can be ensured that the pressure roller 10 will not form an obstruction during the installation of the connecting platform 8, thus improving the ease of installation. At the same time, when the pressure roller 10 acts on the connecting platform 8, the connecting platform 8 will not generate a reaction force to drive the sliding member 9 and the pressure roller 10 to move, further ensuring the sealing performance between the connecting platform 8 and the second sealing shell 2 and the stability of the connecting platform 8 after installation.

[0071] Please see Figures 10-11 The electro-deionization (EDI) water treatment device for producing automotive urea further includes: a connecting pipe 17 and a flow pipeline.

[0072] The connecting pipe 17 is connected to the second sealing shell 2. An ultrafiltration structure is detachably provided inside the connecting pipe 17. The ultrafiltration structure includes an annular support 18 provided inside the connecting pipe 17. Two sets of protruding rings 1801 are provided on the annular support 18. The two sets of protruding rings 1801 abut against the annular ultrafiltration membrane 23 sleeved on the annular support 18.

[0073] The annular support 18 is provided with a connection port 1802, which can be connected to the feed pipeline. The flow pipeline is connected to the connecting pipe 17. When the flow pipeline is open, the ultrafiltration structure can be cleaned.

[0074] A first control valve 19 is provided at the connection between the connecting pipe 17 and the second sealing shell 2;

[0075] The flow pipeline includes a second control valve 20 and a fourth control valve 22 connected to the connecting pipe 17, and a third control valve 21 that passes through the connecting pipe 17 and is connected to the connection port 1802. During installation, the annular ultrafiltration membrane 23 is fitted onto the annular support 18, and then the annular support 18 is inserted into the connecting pipe 17 and the orientation of the connection port 1802 is adjusted. Subsequently, the fourth control valve 22 is installed so that it is connected to the connection port 1802.

[0076] The second control valve 20 is tangential to the inner wall of the connecting pipe 17, and the spiral guide plate 1701 provided on the inner wall of the connecting pipe 17 can guide the liquid that enters the connecting pipe 17 through the second control valve 20.

[0077] In this embodiment, the water has already undergone pretreatment upon entering the device, including primary and secondary reverse osmosis. These two reverse osmosis processes remove impurities from the water, maintaining its high purity. However, the treated water still needs to enter the closed chamber formed between the first sealing shell 1 and the second sealing shell 2 via a pipeline. During this process, the pretreated water is easily re-contaminated due to tank wall debris, sealing ring fragments, or bacterial remains. These impurities, during the electro-deionization process in the closed chamber, can accelerate scaling on the cathode tube 7. In this application, the water delivery pipeline is connected to the second control valve 20, and during the electro-deionization process, only the second control valve 20 and the first control valve 19 are open, allowing water to enter the closed chamber... Water in the connecting pipe 17 needs to pass through the annular ultrafiltration membrane 23 and then enter the closed chamber through the inside of the annular support 18. Since the second control valve 20 is tangential to the inner wall of the connecting pipe 17, the water can rotate when entering the connecting pipe 17. At the same time, under the guidance of the spiral guide plate 1701, the water will make spiral motion in the connecting pipe 17. At this time, large particles of tank wall debris, sealing ring fragments, or bacterial corpses in the water can adhere to the inner wall of the connecting pipe 17 under the action of centrifugal force, thus preventing these large particles of impurities from adhering to the annular ultrafiltration membrane 23 and causing its permeability to decrease. Of course, for some smaller particles of impurities, they will adhere to the annular ultrafiltration membrane 23 under the action of water flow, thereby completing the further filtration of water before electro-deionization and improving its purity.

[0078] After water flows through the annular ultrafiltration membrane 23 for a predetermined time, small particulate impurities will accumulate in the annular ultrafiltration membrane 23, causing the permeability of the annular ultrafiltration membrane 23 to decrease. At this time, the first control valve 19 will be closed, the fourth control valve 22 will be opened, and the second control valve 20 and the third control valve 21 will be alternately open. The third control valve 21 is connected to an external pulse air compressor. When the third control valve 21 is open, the external pulse air compressor can quickly input compressed gas into the annular support 18, causing the annular ultrafiltration membrane 23 to expand. At this time, the small particulate impurities attached to the outside of the annular ultrafiltration membrane 23 can be pushed away by the air pressure and attached to the inner wall of the connecting pipe 17. Then the second control valve 20 is opened, which also generates a spiral water flow in the connecting pipe 17. Under the flushing of the spiral water flow, both large and small particulate impurities attached to the inner wall of the connecting pipe 17 will be washed away and discharged by the fourth control valve 22, thus achieving the removal of impurities.

[0079] The annular ultrafiltration membrane 23 has a serrated cross-section, which gives it a larger filtration area during the filtration process. When compressed gas acts on the annular ultrafiltration membrane 23, it can undergo a certain expansion deformation. At the same time, due to its serrated cross-section, impurities tend to accumulate towards the inside of its bending angle during the filtration process. As the annular ultrafiltration membrane 23 expands, the impurities inside the bending angle are more easily separated from it as the bending angle increases, thus making the cleaning more thorough.

[0080] As an embodiment of the present invention, a method for treating water using the aforementioned electro-deionization (EDI) water treatment device for producing automotive urea is also proposed, comprising the following steps:

[0081] Step 1: Connect the flow pipeline to the external pulse air compressor and external feeding device;

[0082] Step 2: Control the operation of the external feeding device. The raw material enters the connecting pipe 17 and is filtered through the ultrafiltration structure. Then the raw material enters the closed chamber formed between the first sealing shell 1 and the second sealing shell 2 for electro-deionization treatment.

[0083] Step 3: After the raw material supply is scheduled for a certain time, the first control valve 19 is closed, and the external pulse air compressor and external feeding device operate in sequence to clean the ultrafiltration structure.

[0084] Step 4: When the electro-deionization efficiency decreases, push the sliding member 9 to move, so that the locking state of the connecting platform 8 is released. Then, pull out the connecting platform 8 in sequence and clean the dirt, and then reinstall it back into the second sealing shell 2.

[0085] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0086] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An electro-deionization (EDI) water treatment device for producing automotive urea, comprising: A first sealing shell and a second sealing shell, wherein a closed chamber is formed inside the first sealing shell and the second sealing shell, and a fresh water chamber, an anion exchange membrane, a concentrated water chamber, a cation exchange membrane and multiple sets of cathode tubes are sequentially arranged inside the closed chamber. Its characteristic is that it further includes: Multiple connecting platforms are detachably installed on the side of the second sealing shell. Two sets of cathode tubes are connected to the connecting platforms, and the two sets of cathode tubes are arranged diagonally on the connecting platforms. Multiple sets of connecting platforms are sequentially overlapped in the vertical direction, and when the connecting platforms at the upper and lower ends are locked, the other connecting platforms can be locked. At this time, the outer sides of the multiple sets of connecting platforms are coplanar. A hysteresis groove is provided on the side of the second sealing shell, and an energy storage structure is provided inside the hysteresis groove. A grooved wheel is connected to the energy storage structure. A sliding member is slidably disposed in a guide groove formed on the side wall of the hysteresis groove. The sliding member is provided with a protruding abutment portion, which cooperates with the groove wheel to enable the sliding member to tend to stay at the formed end, and to lock the connecting platform at the upper and lower ends when the sliding member is at one end of its stroke. The energy storage structure includes multiple sets of hysteresis sleeves fixedly installed on the inner wall of the hysteresis tank. A telescopic shaft is slidably installed inside the hysteresis sleeve. A support plate is connected to one end of the telescopic shaft away from the hysteresis sleeve. The groove wheel is rotatably installed on both sides of the support plate. The energy storage structure also includes a cylindrical spring disposed inside the hysteresis sleeve, one end of which is connected to the telescopic shaft and the other end of which is connected to the inner wall of the hysteresis sleeve. The protruding abutment includes a first inclined surface and a second inclined surface disposed on the sliding member. The first inclined surface and the second inclined surface are connected, and an outward protrusion protruding toward the accommodative sleeve is formed at the connection between the two. When the grooved wheel moves from the outer protrusion toward the first inclined surface or the second inclined surface, the cylindrical spring releases its elastic potential energy.

2. The electro-deionization (EDI) water treatment device for producing automotive urea according to claim 1, characterized in that, A sealing ring is provided on one side of the second sealing shell. When the connecting platform is inserted into the second sealing shell, the sealing ring is located between the second sealing shell and the connecting platform.

3. The electro-deionization (EDI) water treatment device for producing automotive urea according to claim 1, characterized in that, The connecting platform has a recess and an extension at its two ends protruding from the side of the second sealing shell, and the recess and extension on two adjacent sets of the connecting platform abut and fit together.

4. The electro-deionization (EDI) water treatment device for producing automotive urea according to claim 1, characterized in that, The sliding member is rotatably mounted with a pressure roller at one end away from the hysteresis groove. An inclined part is provided on the connecting platform at the end. The inclined part cooperates with the pressure roller to drive the connecting platform toward the second sealing shell.

5. The electro-deionization (EDI) water treatment device for producing automotive urea according to claim 1, characterized in that, Also includes: A connecting pipe is connected to the second sealing shell, and an ultrafiltration structure is detachably installed inside the connecting pipe; A flow path, connected to the connecting pipe, is used to clean the ultrafiltration structure when the flow path is open.

6. The electro-deionization (EDI) water treatment device for producing automotive urea according to claim 5, characterized in that, The ultrafiltration structure includes an annular support disposed inside a connecting tube, and two sets of protruding rings are provided on the annular support, the two sets of protruding rings abutting against the annular ultrafiltration membrane sleeved on the annular support. The annular support is provided with a connection port, which can be connected to the feeding pipeline.

7. The electro-deionization (EDI) water treatment device for producing automotive urea according to claim 6, characterized in that, A first control valve is provided at the connection between the connecting pipe and the second sealing shell; The flow pipeline includes a second control valve, a fourth control valve connected to the connecting pipe, and a third control valve that passes through the connecting pipe and is connected to the connection port. The second control valve is tangential to the inner wall of the connecting pipe, and the spiral guide plate disposed on the inner wall of the connecting pipe can guide the liquid entering the connecting pipe through the second control valve.

8. A method for treating water using the electro-deionization (EDI) water treatment device for producing automotive urea as described in any one of claims 6-7, characterized in that, Includes the following steps: Step 1: Connect the flow pipeline to the external pulse air compressor and external feeding device; Step 2: Control the operation of the external feeding device. The raw material enters the connecting pipe and is filtered through the ultrafiltration structure. Then the raw material enters the closed chamber formed between the first sealing shell and the second sealing shell for electro-deionization treatment. Step 3: After the raw material supply is scheduled for a certain time, the first control valve closes, and the external pulse air compressor and external feeding device operate in sequence to clean the ultrafiltration structure. Step 4: When the electro-deionization efficiency decreases, push the sliding component to move, releasing the locking state of the connecting platform. Then, pull out the connecting platform one by one, clean the dirt, and then reinstall it back into the second sealing shell.

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