Efficient urea water generating device for ship SCR system

Abstract

This invention discloses a high-efficiency urea water generation device for a ship's SCR system, specifically relating to the field of urea water. It includes a filter cartridge with an inlet pipe on the upper side and an outlet pipe on the lower side of the cartridge. A pleated filter is installed inside the cartridge. Urea water enters the cartridge through the inlet pipe, is filtered by the pleated filter, and then exits through the outlet pipe. The pleated filter has a pleated filter membrane, which is a corrugated cylindrical structure formed by folding several layers of continuous annular filter membranes. An extension component is installed inside the cartridge to push the pleated filter membranes upwards layer by layer. This invention, by using the extension component to push the pleated filter membranes upwards layer by layer, allows each layer to unfold sequentially, aligning the filter surface of the pleated filter membrane towards the center of the filter. This causes the urea water to impact the unfolded filter surface, flushing away most of the filtered waste adhering to the membrane and thus improving its filtration capacity.

Description

Technical Field

[0001] This invention relates to the field of urea solution technology, and more specifically, to a high-efficiency urea solution generation device for a ship SCR system. Background Technology

[0002] Urea-selective catalytic reduction (SCR) is the most effective method for reducing diesel engine emissions. Urea, acting as a reducing agent, undergoes reactions such as evaporation, pyrolysis, and hydrolysis to produce ammonia. Under the action of a catalyst, the ammonia reacts with nitrogen oxides, reducing them to nitrogen and water. This can reduce harmful nitrogen oxides in engine exhaust by more than 50%, making ships more environmentally friendly and reducing harmful emissions. Marine SCR systems mainly consist of a reducing agent supply and injection unit, a catalytic reactor, and a control unit.

[0003] Urea aqueous solution contains abundant nitrogen source. During the generation process, bacteria, algae and other microorganisms are prone to grow, forming biological slime and biofilm, which can clog the precision nozzles of the SCR system. Therefore, these impurities need to be filtered out during generation to prevent clogging of the precision nozzles of the SCR system. At the same time, it is necessary to avoid impurities causing abnormal urea concentration and denitrification failure in the system, so as to ensure that the ship's exhaust emissions meet the standards and the equipment operates stably for a long time.

[0004] Chinese utility model patent (publication number CN206867831U) discloses a urea solution filtration device with antifreeze protection function. It uses a filter element to filter urea water. The filter element is generally a pleated filter because it can greatly increase the filtration area in a small volume through the pleated structure, which can achieve high-precision filtration of 0.22μm and effectively protect the SCR nozzle from clogging. At the same time, it has the characteristics of large flow rate, small pressure difference and resistance to urea corrosion, and can meet the continuous filtration requirements under ship operating conditions.

[0005] The pleated filter mainly consists of a porous central skeleton, a pleated filter membrane, upper and lower end caps, sealing gaskets, and an outer shell. However, the existing pleated filter membranes have pleats arranged along the axial direction, forming a cylindrical structure. During filtration, impurities enter the pleated filter surface of the membrane. Due to the tight pleating, the impurities cannot flow downwards. Once a certain amount of impurities adheres to the surface of the pleated filter membrane, it quickly becomes ineffective. Summary of the Invention

[0006] The present invention provides a high-efficiency urea water generation device for a ship SCR system. The problem to be solved is that when urea water is filtered, impurities will enter the folded filter surface of the filter membrane. Due to the close proximity of the folded filter, the impurities cannot flow downwards. After a certain amount of impurities are attached to the surface of the folded filter membrane, it will quickly fail.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a high-efficiency urea water generation device for a ship SCR system, comprising a filter cartridge, an inlet pipe and an outlet pipe respectively provided on the upper and lower sides of the filter cartridge, and a pleated filter provided inside the filter cartridge. Urea water enters the filter cartridge from the inlet pipe, is filtered by the pleated filter, and is discharged from the outlet pipe. The pleated filter has a pleated filter membrane, which is a corrugated cylindrical structure formed by folding several layers of continuous annular filter membranes. An extension component is provided inside the filter cartridge, which is used to push the pleated filter membranes upward layer by layer, thereby forming a contraction zone and an extension zone in the pleated filter.

[0008] Preferably, the extension assembly includes a mounting block that can move vertically along the filter cartridge, a rotating frame that can rotate is mounted on the mounting block, and push rods are mounted at both ends of the rotating frame, the two push rods alternately pushing the folded filter membrane upward.

[0009] Preferably, a guide ring is installed on the mounting block, and a guide rail is provided on the annular surface of the guide ring near the push rod. A spring is sleeved on the outside of the push rod, and the two ends of the spring press against the rotating frame and the push rod, so that one end of the push rod presses against the guide rail.

[0010] Preferably, the guide rail includes a pushing area, a retracting area, and an extending area connected end to end. The pushing area occupies half of the guide rail area, while the retracting area and the extending area each occupy one-quarter of the guide rail area.

[0011] Preferably, the filter cartridge is provided with a drive assembly, which includes a lead screw and a guide rod vertically installed inside the filter cartridge. A motor is installed on the filter cartridge, and the output end of the motor is connected to the lead screw via a drive. A mounting block is sleeved on the lead screw and the guide rod and is connected to the lead screw via a threaded drive.

[0012] Preferably, a second drive assembly is provided on the filter cartridge. The second drive assembly includes a drive rod vertically installed inside the filter cartridge. A second motor is installed on the filter cartridge. The output end of the second motor is connected to the drive rod. A second bevel gear set is installed at one end of the rotating frame. The drive rod and the rotating frame are connected to each other through the second bevel gear set. One of the bevel gears of the second bevel gear set is slidably installed on the drive rod.

[0013] Preferably, a spiral blade is provided directly below the rotating frame, and each layer of the spiral blade contains a layer of folded filter membrane, and the folded filter membrane contained therein is the uppermost folded filter membrane in the area where the contraction zone is located below the extension zone.

[0014] Preferably, the extension assembly further includes a transmission assembly, in which the helical blade and the rotating frame are connected by transmission, and the transmission ratio is 0.5. The transmission assembly includes a rotating shaft that rotates at the bottom of the mounting block, the helical blade is rotatably mounted on the mounting block, the rotating shaft and the helical blade are driven by a bevel gear set, and the rotating frame and the rotating shaft are driven by a transmission box.

[0015] Preferably, a fixing tube is fixedly installed at the bottom of the inner side of the filter cartridge, and an insertion post is installed at the bottom of the pleated filter. The insertion post is inserted into the fixing tube, and a vibration motor is fixedly installed at the bottom of the insertion post.

[0016] Preferably, a flow equalization plate is installed on the upper part of the inner side of the filter cartridge, a funnel is installed on the lower side of the flow equalization plate, the upper end of the pleated filter is fixed on the lower side of the funnel, and the outlet end of the inlet pipe is located above the funnel.

[0017] The technical effects and advantages of this invention are as follows: This invention uses an extension component to push the pleated filter membrane upwards layer by layer, so that each layer of the pleated filter membrane unfolds in sequence. In other words, the filtration surface of the pleated filter membrane faces the middle of the pleated filter, so that the urea water impacts the unfolded filtration surface of the pleated filter membrane, washing away most of the impurities attached to it downwards, thereby improving its filtration capacity. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 This is a partial structural diagram of the present invention;

[0020] Figure 3 For the present invention Figure 2 A sectional view of the structure;

[0021] Figure 4 This is a schematic diagram of the structure of the folded filter, drive component one, and drive component two of the present invention;

[0022] Figure 5 For the present invention Figure 4 Front view of the structure;

[0023] Figure 6 This is a schematic diagram of the structure of the extension component of the present invention;

[0024] Figure 7 For the present invention Figure 5 Enlarged view of the local structure at point A;

[0025] Figure 8 This is a schematic diagram of the structure of the reaction vessel of the present invention.

[0026] The attached figures are labeled as follows: 1. Filter cartridge; 11. Inlet pipe; 12. Outlet pipe; 13. Fixed pipe; 2. Pleated filter; 20. Pleated filter membrane; 21. Closing area; 22. Extension area; 23. Insert column; 3. Extension assembly; 31. Mounting block; 32. Rotating frame; 33. Push rod; 34. Spring; 35. Guide ring; 350. Guide rail; 351. Pushing area; 352. Retraction area; 353. Extension area; 36. Spiral blade 37. Transmission assembly; 371. Rotating shaft; 372. Bevel gear set one; 373. Transmission box; 4. Vibration motor; 5. Drive assembly one; 51. Lead screw; 52. Guide rod; 53. Motor one; 6. Drive assembly two; 61. Drive rod; 62. Motor two; 63. Bevel gear set two; 7. Flow equalization plate; 71. Funnel; 8. Reactor; 81. Reactor body; 82. Stirring shaft; 83. Gear motor; 84. Feeding hopper. Detailed Implementation

[0027] 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.

[0028] Refer to the instruction manual appendix Figures 2-4 A high-efficiency urea water generation device for a ship SCR system includes a filter cartridge 1. An inlet pipe 11 and an outlet pipe 12 are respectively provided on the upper and lower sides of the filter cartridge 1. A pleated filter 2 is provided inside the filter cartridge 1. Urea water enters the filter cartridge 1 from the inlet pipe 11, is filtered by the pleated filter 2, and is discharged from the outlet pipe 12.

[0029] It should be noted that after the urea solution is generated, it contains impurities, including slime and biofilm produced by the metabolism of microorganisms such as bacteria and algae, as well as undissolved urea. The urea solution enters the filter cartridge 1 through the inlet pipe 11 and is filtered through the pleated filter 2. The filtered urea solution is discharged into the storage tank through the outlet pipe 12.

[0030] In this embodiment, as Figure 4 As shown, the pleated filter 2 has a pleated filter membrane 20, which is a corrugated cylindrical structure formed by folding several layers of continuous annular filter membranes. The filter cylinder 1 is provided with an extension component 3, which is used to push the pleated filter membrane 20 upward layer by layer, so that the pleated filter 2 forms a closing area 21 and an extension area 22.

[0031] It should be noted that the stretching component 3 pushes the folded filter membrane 20 upward layer by layer, causing the lower folded filter membrane 20 located in the pushed folded filter membrane 20 to unfold and form the stretching area 22. The folded filter membranes 20 located above and below the stretching area 22 are still in a folded state, and are therefore called the closing area 21. If the stretching area 22 is at the top, there is only one closing area 21 located below the stretching area 22. If the stretching area 22 is at the bottom, there is also only one closing area 21 located above the stretching area 22. If the stretching area 22 is neither at the top nor at the bottom, there are two closing areas 21 located above and below the stretching area 22, respectively.

[0032] In this embodiment, as Figure 4 As shown, the extension assembly 3 includes a mounting block 31 that can move vertically along the filter cartridge 1. A rotating frame 32 that can rotate is mounted on the mounting block 31. Push rods 33 are mounted at both ends of the rotating frame 32. The two push rods 33 alternately push the folded filter membrane 20 upward.

[0033] Furthermore, a drive assembly 5 is provided on the filter cartridge 1. The drive assembly 5 includes a lead screw 51 and a guide rod 52 vertically installed inside the filter cartridge 1. A motor 53 is installed on the filter cartridge 1. The output end of the motor 53 is connected to the lead screw 51 for transmission. The mounting block 31 is sleeved on the lead screw 51 and the guide rod 52 and is threadedly connected to the lead screw 51 for transmission.

[0034] It should be noted that when the motor 53 moves the lead screw 51, the screw 51 is driven by the threaded transmission between the lead screw 51 and the mounting block 31, which can drive the mounting block 31 to move. The guide rod 52 plays a guiding role, so that the drive assembly 5 can drive the mounting block 31 to move vertically, so that the extension assembly 3 can sequentially move the folded filter membrane 20 from top to bottom.

[0035] Furthermore, a second drive assembly 6 is provided on the filter cartridge 1. The second drive assembly 6 includes a drive rod 61 vertically installed inside the filter cartridge 1. A second motor 62 is installed on the filter cartridge 1. The output end of the second motor 62 is connected to the drive rod 61. A second bevel gear set 63 is installed at one end of the rotating frame 32. The drive rod 61 and the rotating frame 32 are connected to each other through the second bevel gear set 63. One of the bevel gears of the second bevel gear set 63 is slidably installed on the drive rod 61.

[0036] It should be noted that the second bevel gear set 63 consists of two bevel gears. One bevel gear is fixed to the rotating frame 32, and the other bevel gear is mounted on the rotating frame 32 via a bracket and is sleeved on the drive rod 61 and slidably connected to the drive rod 61, allowing the bevel gear to move along the axis of the drive rod 61. Thus, even if the first drive assembly 5 drives the extension assembly 3 to move vertically, the second motor 62 can still drive the rotating frame 32 to rotate via the drive rod 61 and the second bevel gear set 63. Specifically, when the extension assembly 3 moves downward, one of the bevel gears in the second bevel gear set 63 moves downward along the drive rod 61, without hindering the rotation of the rotating frame 32 via the bevel gear set 63 when the second motor 62 and the drive rod 61 rotate.

[0037] In this embodiment, the implementation method is as follows: In the initial state, the two push rods 33 are in a vertical position, that is, one is at the highest point and the other is at the lowest point. The two push rods 33 are located on the upper and lower sides of a layer of pleated filter membrane 20, respectively. That is, the upper push rod 33 pushes the pleated filter membrane 20 upward, and the lower push rod 33 is ready to push the lower layer of pleated filter membrane 20 upward. First, the motor 62 drives the guide ring 35 to rotate half a turn through the drive rod 61 and the bevel gear set 63, causing the upper push rod 33 to rotate downward and the lower push rod 33 to rotate upward. Thus, the lower push rod 33 can swing the layer of pleated filter membrane 20 upward, while the upper push rod 33 rotates downward to the next layer of pleated filter membrane 20, ready to push it upward. Then, the drive component 1 5 drives the stretching component 3 to move downwards a certain distance, and then the drive component 2 6 drives the rotating frame 32 to rotate and repeat the tossing process. By repeating this process, the stretching component 3 can push the pleated filter membrane 20 upwards layer by layer, so that each layer of the pleated filter membrane 20 can be unfolded. When the pleated filter membrane 20 is unfolded, the urea water has a certain impact on the surface of the unfolded pleated filter membrane 20, which washes the impurities downwards.

[0038] The above technical solution uses an extension component 3 to push the pleated filter membrane 20 upwards layer by layer, causing each layer of the pleated filter membrane 20 to unfold sequentially. This means the filtration surface of the pleated filter membrane 20 faces the center of the pleated filter 2, allowing the urea water to impact the unfolded filtration surface of the pleated filter membrane 20, flushing most of the impurities attached to it downwards, thereby improving its filtration capacity. Compared with existing pleated filters, the pleated filter 2 in this embodiment, because it is designed as a corrugated cylindrical structure formed by folding several continuous annular filter membranes, can unfold sequentially along the axial direction to expose impurities, whereas existing technologies cannot unfold, and impurities cannot be exposed.

[0039] It should be noted that by properly setting the dimensions of the push rod 33 and the pleated filter membrane 20, the push rod 33 can be rotated upwards to move the pleated filter membrane 20 without detaching. In addition, iron wires can be set on the edge of the pleated filter membrane 20 to improve its resistance to deformation.

[0040] In order to enable the push rod 33 to smoothly extend under the lower pleated filter membrane 20 after pushing the pleated filter membrane 20 upward, the following technical solution is proposed.

[0041] Refer to the instruction manual appendix Figures 4-6 A guide ring 35 is installed on the mounting block 31. A guide rail 350 is provided on the annular surface of the guide ring 35 near the push rod 33. A spring 34 is sleeved on the outside of the push rod 33. The two ends of the spring 34 press on the rotating frame 32 and the push rod 33, so that one end of the push rod 33 presses on the guide rail 350.

[0042] Furthermore, the guide rail 350 includes a pushing area 351, a retraction area 352, and an extension area 353 connected end to end. The pushing area 351 occupies half of the area of ​​the guide rail 350, while the retraction area 352 and the extension area 353 each occupy one-quarter of the area of ​​the guide rail 350.

[0043] It should be noted that, as Figure 6 As shown, the push area 351 is located on the left side of the guide ring 35, and the retraction area 352 and the extension area 353 are located on the right side. The retraction area 352 is located above the extension area 353. When the rotating frame 32 rotates, the upper push rod 33 passes through the retraction area 352, the extension area 353 and the push area 351 in sequence, and performs the actions of retraction, extension and holding extension. Retraction is the push rod 33 retracting from the upper pleated filter membrane 20, extension is the extension to the lower side of the lower pleated filter membrane 20, and holding is the process of pushing the pleated filter membrane 20 upward. The same applies to the lower push rod 33.

[0044] When the stretching assembly 3 moves the pleated filter membrane 20 upward layer by layer from top to bottom, at the beginning of the movement, due to the influence of water flow fluctuations, if the spacing between the pleated filter membranes 20 in the stretching area 22 is small and there are multiple layers, for example, if the spacing between the multiple layers of pleated filter membranes 20 is less than the distance between the two push rods 33, the lower push rod 33 may move to the lower side of the multiple layers of pleated filter membranes 20 to move them upward. Therefore, the following technical solution is proposed.

[0045] Refer to the instruction manual appendix Figures 5-7 A spiral blade 36 is provided directly below the rotating frame 32. Each layer of the spiral blade 36 contains a layer of folded filter membrane 20, and the folded filter membrane 20 contained therein is the uppermost folded filter membrane 20 located in the area where the contraction area 21 is located below the extension area 22.

[0046] Furthermore, the extension assembly 3 also includes a transmission assembly 37, through which the helical blade 36 and the rotating frame 32 are connected by transmission, and the transmission ratio is 0.5. The transmission assembly 37 includes a rotating shaft 371 that rotates at the bottom of the mounting block 31. The helical blade 36 is rotatably mounted on the mounting block 31. The rotating shaft 371 and the helical blade 36 are driven by a bevel gear set 372. The rotating frame 32 and the rotating shaft 371 are driven by a transmission box 373.

[0047] It should be noted that each layer of the spiral blades 36 contains a layer of pleated filter membrane 20, meaning that the edge of the pleated filter membrane 20 is located between the spiral blades 36 of each layer. Thus, when the spiral blades 36 rotate, the pleated filter membrane 20 is released upwards layer by layer. Since the pleated filter membrane 20 is pushed upwards twice for every one rotation of the rotating frame 32, the rotational speed of the spiral blades 36 should be twice that of the rotating frame 32, i.e., the transmission ratio is 0.5. Figure 4 As shown, the area of ​​the retracting zone 21 has a layer of pleated filter membrane 20. When the push rod 33 extends under the pleated filter membrane 20, the spiral blade 36 can release a layer of pleated filter membrane 20. This ensures that the push rod 33 can always be inserted under the pleated filter membrane 20 in the extension zone 22. The extension zone 22 has only one layer of pleated filter membrane 20, thereby avoiding the influence of water flow fluctuations and ensuring the continuity of moving the pleated filter membrane 20.

[0048] In this embodiment, as Figure 3 As shown in the figure, a fixed tube 13 is fixedly installed at the bottom of the inner side of the filter cartridge 1, and a plug 23 is installed at the bottom of the pleated filter 2. The plug 23 is inserted into the fixed tube 13, and a vibration motor 4 is fixedly installed at the bottom of the plug 23.

[0049] It should be noted that the vibration generated by the vibration motor 4 can accelerate the falling of impurities on the folded filter membrane 20.

[0050] In this embodiment, a skeleton structure can be provided on the inner and outer sides of the folded filter 2 to ensure the stability of the folded filter 2.

[0051] In this embodiment, as Figure 3 As shown, a flow equalization plate 7 is installed on the upper part of the inner side of the filter cartridge 1, and a funnel 71 is installed on the lower side of the flow equalization plate 7. The upper end of the pleated filter 2 is fixed on the lower side of the funnel 71, and the outlet end of the water inlet pipe 11 is located above the funnel 71.

[0052] It should be noted that by setting the flow equalization plate 7, the impact force of the urea solution can be reduced and its flow rate fluctuations can be decreased.

[0053] In this embodiment, a high-efficiency urea water generation device for a marine SCR system further includes a reaction vessel 8. The reaction vessel 8 includes a vessel body 81, a stirring shaft 82 rotatably installed inside the vessel body 81, and a reduction motor 83 installed on the top of the vessel body 81. The output end of the reduction motor 83 is connected to the stirring shaft 82. The rotation of the stirring shaft 82 by the reduction motor 83 can achieve a stirring effect and accelerate the dissolution of urea. A feeding hopper 84 is also installed on the vessel body 81, through which urea can be added. A valve is provided on the feeding hopper 84.

[0054] The reactor body 81 adopts a double-layer reactor heating structure. When generating urea solution, pure water is first injected into the reactor body 81 until the water level reaches the set value. The heating system is started. When the jacket water temperature of the reactor body 81 is <30°C, heating is started. When the jacket water temperature is >40°C, heating is stopped. A certain amount of urea granules are poured into the reactor body 81 and stirred. When the solution concentration reaches 40%, the system continues to run for 10 minutes to ensure that the liquid is fully mixed and uniform. After stirring stops, the delivery valve is opened, and the urea solution is delivered from the inlet pipe 11 to the pleated filter 2 for filtration.

[0055] Traditionally, ships need to purchase urea solution packaging containers that meet IBC standards in advance. Furthermore, the ports where urea solution can be obtained are limited, and many ports do not recycle these containers, leading to high disposal costs. However, with this urea solution generation device, urea solution can be prepared on board. Only urea packaged in sacks needs to be purchased in advance, avoiding the problem of packaging container recycling.

[0056] Working principle: After urea water is generated in reactor 8, it is transported from inlet pipe 11 to pleated filter 2 for filtration. The filtered urea water is discharged from outlet pipe 12 into storage chamber. After filtration for a period of time, when there are many impurities on the pleated filter membrane 20, the drive component 2 6 drives the guide ring 35 to rotate half a turn, pushing the pleated filter membrane 20 upward once. With each push, the drive component 1 5 drives the extension component 3 to move downward a short distance. During this process, the rotating frame 32 rotates once, pushing the pleated filter membrane 20 twice, and the spiral blade 36 rotates twice, releasing two layers of pleated filter membrane 20. The urea water impacts the unfolded filter surface of the pleated filter membrane 20, washing away most of the impurities attached to it.

[0057] In conclusion, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A kind of ship SCR system urea water high-efficiency generation device, it is characterized by: The filter includes a filter cartridge (1), with an inlet pipe (11) and an outlet pipe (12) respectively provided on the upper and lower sides of the filter cartridge (1). A pleated filter (2) is provided inside the filter cartridge (1). Urea water enters the filter cartridge (1) from the inlet pipe (11), is filtered by the pleated filter (2), and is discharged from the outlet pipe (12). The pleated filter (2) has a pleated filter membrane (20), which is a corrugated cylindrical structure formed by folding several layers of continuous annular filter membranes. The filter cylinder (1) is provided with an extension component (3), which is used to push the pleated filter membrane (20) upward layer by layer, so that the pleated filter (2) forms a closing area (21) and an extension area (22). The extension assembly (3) includes a mounting block (31) that can move vertically along the filter cartridge (1). A rotating frame (32) that can rotate is mounted on the mounting block (31). Push rods (33) are mounted at both ends of the rotating frame (32). The two push rods (33) alternately push the folded filter membrane (20) upward. A guide ring (35) is installed on the mounting block (31). A guide rail (350) is provided on the annular surface of the guide ring (35) near the push rod (33). A spring (34) is sleeved on the outside of the push rod (33). The two ends of the spring (34) press on the rotating frame (32) and the push rod (33), so that one end of the push rod (33) presses on the guide rail (350). The guide rail (350) includes a pushing area (351), a retraction area (352) and an extension area (353) connected end to end. The pushing area (351) occupies half of the area of ​​the guide rail (350), and the retraction area (352) and the extension area (353) each occupy one-quarter of the area of ​​the guide rail (350).

2. The device for generating high-efficiency urea water of a ship SCR system according to claim 1, characterized in that: The filter cartridge (1) is provided with a drive assembly (5), which includes a lead screw (51) and a guide rod (52) vertically installed inside the filter cartridge (1). The filter cartridge (1) is equipped with a motor (53), the output end of which is connected to the lead screw (51) for transmission. The mounting block (31) is sleeved on the lead screw (51) and the guide rod (52) and is threadedly connected to the lead screw (51).

3. The device for generating high-efficiency urea water of a ship SCR system according to claim 1, characterized in that: The filter cartridge (1) is provided with a second drive assembly (6), which includes a drive rod (61) vertically installed inside the filter cartridge (1). The filter cartridge (1) is provided with a second motor (62), the output end of which is connected to the drive rod (61) for transmission. One end of the rotating frame (32) is provided with a second bevel gear set (63), the drive rod (61) and the rotating frame (32) are connected for transmission through the second bevel gear set (63), and one of the bevel gears of the second bevel gear set (63) is slidably installed on the drive rod (61).

4. The device according to claim 1, characterized in that: A spiral blade (36) is provided directly below the rotating frame (32). Each layer of the spiral blade (36) contains a layer of folded filter membrane (20), and the folded filter membrane (20) contained therein is the uppermost folded filter membrane (20) in the area where the contraction area (21) is located below the extension area (22).

5. The device for generating high-efficiency urea water of a ship SCR system according to claim 4, characterized in that: The extension assembly (3) also includes a transmission assembly (37). The spiral blade (36) and the rotating frame (32) are connected by the transmission assembly (37) with a transmission ratio of 0.

5. The transmission assembly (37) includes a rotating shaft (371) that rotates at the bottom of the mounting block (31). The spiral blade (36) is rotatably mounted on the mounting block (31). The rotating shaft (371) and the spiral blade (36) are connected by a bevel gear set (372). The rotating frame (32) and the rotating shaft (371) are connected by a transmission box (373).

6. The high-efficiency urea water generation device for a ship SCR system according to claim 1, characterized in that: A fixing tube (13) is fixedly installed at the bottom of the inner side of the filter cartridge (1), and a plug (23) is installed at the bottom of the folded filter (2). The plug (23) is inserted into the fixing tube (13), and a vibration motor (4) is fixedly installed at the bottom of the plug (23).

7. The high-efficiency urea water generation device for a ship SCR system according to claim 1, characterized in that: A flow equalization plate (7) is installed on the upper side of the inner side of the filter cartridge (1), and a funnel (71) is installed on the lower side of the flow equalization plate (7). The upper end of the folded filter (2) is fixed on the lower side of the funnel (71), and the water outlet of the water inlet pipe (11) is located above the funnel (71).

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