Multistage ultrafiltration equipment

Abstract

The invention discloses multistage ultrafiltration equipment, and relates to the technical field of water purification equipment. The device comprises a bottom plate, the upper end face of the bottom plate is fixedly connected with a protection structure, an inner cavity of the protection structure is evenly and slidably connected with filtering structures, the front end face of a sealing structure is evenly and fixedly connected with limiting structures, the end faces of the left side and the right side of the protection structure are both fixedly connected with connecting structures, and inner cavities of the connecting structures are provided with one-way flow blocking structures. The upper portion of the outer surface of the one-way flow choking structure is fixedly connected with a rotating structure, the water inlet pipe is in threaded connection with the protection frame left side connecting frame, and the water outlet pipe is in threaded connection with the protection frame right side connecting frame, so that equipment is convenient to mount, dismount and maintain through the connection mode; the one-way flow blocking structure ensures that water flow enters the inner cavity of the protection frame to be filtered according to the preset direction, the water flow path is effectively controlled, reverse flow is prevented, meanwhile, the arrangement of the telescopic structure and the spring can adapt to the change of water flow pressure, and the stable filtering process is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of water purification equipment, and particularly to a multi-stage ultrafiltration device. Background Art

[0002] An ultrafiltration membrane is a polymer semi-permeable membrane used in the ultrafiltration process to separate polymer colloids or suspended particles of a certain size from a solution. Driven by pressure, ultrafiltration membranes have been widely used in the advanced treatment of industrial wastewater and process water, such as the concentration, purification, and separation of macromolecular substances in the chemical, food, and pharmaceutical industries, the sterilization of biological solutions, the separation of dyes in printing and dyeing wastewater, the recovery of glycerol in petrochemical wastewater, the recovery of silver in photographic chemical wastewater, and the preparation of ultrapure water. In addition, it can also be used for sludge thickening and dewatering, etc.

[0003] After retrieval, a Chinese invention patent discloses an integrated multi-stage water purification ultrafiltration membrane device with algae removal, with the publication number CN118289889A, including: an ultrafiltration membrane device housing and an algae removal housing. The algae removal housing is arranged below the ultrafiltration membrane device housing, and a plurality of filter elements are equidistantly arranged inside the algae removal housing. In the present invention, sewage is transported into the interior of the algae removal housing through a second water inlet pipe. Under the action of the sewage impact force, the rotating blades can rotate, causing the sewage to be transported towards the second water outlet pipe. The algae substances are filtered and intercepted by the filter elements. Synchronously, as the scraping strip rotates, the algae substances adsorbed on the bottom of the filter elements can be scraped off, preventing the algae substances from adhering to the surface of the ultrafiltration membrane filaments and blocking the tiny holes of the ultrafiltration membrane filaments. In this way, the integrated multi-stage water purification ultrafiltration membrane device does not need to perform backwashing operations frequently, thereby improving the filtration efficiency of the integrated multi-stage water purification ultrafiltration membrane device.

[0004] In the existing devices, when water flows into and out of the filtration device, the unidirectional flow of water cannot be precisely controlled, resulting in easy water reflux during the use of the device, thereby causing secondary pollution of the filtered water flow. At the same time, in the ultrafiltration device, the structure of the filtration structure is relatively complex and there are cleaning dead corners in the device, resulting in incomplete cleaning.

[0005] Therefore, the existing multi-stage ultrafiltration device cannot meet the requirements in actual use, so there is an urgent need for improved technologies in the market to solve the above problems. Summary of the Invention

[0006] The purpose of the present invention is to provide a multi-stage ultrafiltration device, which solves the problems raised in the above background art through the settings.

[0007] To solve the above technical problems, the present invention is realized through the following technical solutions: The present invention relates to a multi-stage ultrafiltration device, including a bottom plate. A protective structure is fixedly connected to the upper end surface of the bottom plate. A filtering structure is evenly and slidably connected inside the protective structure. A sealing structure is arranged on the front end surface of the protective structure. A limiting structure is evenly and fixedly connected to the front end surface of the sealing structure. Connecting structures are fixedly connected to both the left and right end surfaces of the protective structure. A one-way flow-blocking structure is arranged inside the connecting structure. An upper portion of the outer surface of the one-way flow-blocking structure is fixedly connected to a rotating structure.

[0008] Preferably, the protective structure includes a protective frame fixedly connected to the upper end surface of the bottom plate. A top plate is fixedly connected to the upper end surface of the protective frame. Mounting frames are fixedly connected symmetrically along the center line inside the protective frame. A plurality of chutes penetrating adjacent mounting frames are evenly formed on the front end surface of the mounting frames. The filtering structure is slidably connected inside the chutes.

[0009] Preferably, the filtering structure includes a filter frame slidably connected inside the chutes on the front end surface of the mounting frames. A filter element is fixedly connected inside the filter frame. The filter element is specifically divided into a multi-media filtration layer, an activated carbon filtration layer, and other filtration layers according to the filtration purpose and material.

[0010] Preferably, the specific materials of the multi-media filtration layer in the filter element are respectively a quartz sand filtration layer, a ceramsite filtration layer, and a fiber bundle filtration layer. The specific materials of the activated carbon filtration layer are respectively granular activated carbon, powdered activated carbon, and coconut shell activated carbon. The specific materials of the other filtration layers are respectively dense polypropylene, an ultrafiltration membrane, and an ion exchange resin.

[0011] Preferably, the sealing structure includes diversion grooves evenly formed on the front end surface of the protective frame. A sealing plate is hinged to the lower end surface inside the diversion grooves through a hinge. A limiting frame is fixedly connected to the upper portion of the front end surface of the protective frame. A limiting structure is fixedly connected to the upper portion of the front end surface of the sealing plate.

[0012] Preferably, the limiting structure includes a sliding frame fixedly connected to the upper portion of the front end surface of the sealing plate. A limiting spring is fixedly connected to the lower end surface inside the sliding frame. A limiting plug is fixedly connected to the upper end surface of the limiting spring. The limiting plug is slidably connected inside the sliding frame. The upper end surface of the limiting plug is engaged with a groove on the lower end surface of the limiting frame. An adjusting block is fixedly connected to the lower portion of the front end surface of the limiting plug.

[0013] Preferably, the connecting structure includes transmission pipes respectively fixedly connected to the left and right sides of the protective frame. Connecting discs are fixedly connected to the ends of the transmission pipes far away from the protective frame. Connecting frames are fixedly connected to the ends of the connecting discs far away from the transmission pipes. A threaded groove for connecting a water pipe is formed inside the connecting frame. A one-way flow-blocking structure is arranged inside the connecting disc.

[0014] Preferably, the one-way flow-blocking structure includes a flow-blocking block placed in the inner cavity of the connection plate and engaged with the transmission pipe. One end of the flow-blocking block away from the transmission pipe is fixedly connected with a telescopic inner rod. The outer surface of the telescopic inner rod is slidably connected with a telescopic sleeve. A flow-blocking spring is movably sleeved on the outer surface of the telescopic sleeve and the flow-blocking block. One end of the flow-blocking spring away from the connecting frame is fixedly connected with the flow-blocking block.

[0015] Preferably, the rotating structure includes a fixing plate fixedly connected to one end of the telescopic sleeve away from the flow-blocking block. The fixing plate is fixedly connected with one end of the flow-blocking spring away from the flow-blocking block. The outer edge of one side of the fixing plate close to the flow-blocking block is fixedly connected with a rotating frame. The one-way flow-blocking structure is movably sleeved in the inner cavity of the rotating frame. The upper part of the outer surface of the rotating frame is fixedly connected with a rotating wrench, and the rotating wrench penetrates through the connection plate and is rotatably connected.

[0016] The present invention has the following beneficial effects: 1. In the present invention, the water inlet pipe is threadedly connected to the left connecting frame of the protective frame, and the water outlet pipe is threadedly connected to the right connecting frame of the protective frame. This connection method facilitates the installation and disassembly of the equipment, and is convenient for the maintenance and repair of the equipment. Through the one-way flow-blocking structure, it is ensured that the water flows into the inner cavity of the protective frame in a predetermined direction for filtration, effectively controlling the water flow path and preventing backflow. At the same time, the setting of the telescopic structure and the spring can adapt to the change of water flow pressure, ensuring the stable progress of the filtration process. Through multiple filtration structures in the inner cavity of the protective frame for multi-stage ultrafiltration, the water flow can be filtered more finely and comprehensively, improving the filtration effect, removing various impurities in the water, and making the quality of the filtered water higher. Through a one-way flow-blocking structure similar to that on the water inlet side, it ensures the smooth discharge of the filtered water, and at the same time ensures the one-way nature of the entire filtration system, preventing the backflow of the filtered water and affecting the filtration effect.

[0017] 2. By rotating the rotating structure in the present invention, the water flow is reversely injected into the inner cavity of the device, which is convenient for cleaning the filtration structure. The reverse water flow flushes the impurities attached to the filtration side of the filtration structure, and a good cleaning effect can be achieved without a complex disassembly process, improving the maintenance efficiency of the equipment and extending the service life of the filtration structure. By pulling down the adjusting block, the limit insertion plate slides down, the limit spring contracts, and the sliding frame is pulled to turn the sealing plate downward, and the inner cavity of the diversion groove is communicated, which can effectively discharge the sewage generated during cleaning from the equipment. The sewage discharge is realized through simple operation, which is convenient for the sewage treatment after the equipment is cleaned. Through the sealing structure, the sealing performance of the equipment during normal filtration work can be ensured, preventing water leakage and ensuring the normal progress of the filtration process. At the same time, the sealing operation after the replacement of the filtration structure is also relatively simple and easy.

[0018] Of course, it is not necessary for any product implementing the present invention to achieve all the above advantages simultaneously. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0020] Figure 1 Schematic diagram of the front view three-dimensional structure of the present invention; Figure 2 Schematic diagram of the left side view three-dimensional structure of the present invention; Figure 3 Schematic diagram of the horizontal half-section three-dimensional structure of the present invention; Figure 4 Schematic diagram of the longitudinal half-section three-dimensional structure of the present invention; Figure 5 Schematic diagram of the installation structure of the one-way flow-blocking structure of the present invention; Figure 6 For the present invention Figure 3 Schematic diagram of the enlarged structure of area A in; Figure 7 For the present invention Figure 4 Schematic diagram of the enlarged structure of area B in.

[0021] In the drawings, the list of components represented by each reference numeral is as follows: 1. Bottom plate; 2. Protection structure; 21. Protection frame; 22. Top plate; 23. Installation frame; 3. Filter structure; 31. Filter frame; 32. Filter element; 4. Sealing structure; 41. Flow guide groove; 42. Sealing plate; 43. Limiting frame; 5. Limiting structure; 51. Sliding frame; 52. Limiting spring; 53. Limiting insertion plate; 54. Adjusting block; 6. Connection structure; 61. Transmission pipe; 62. Connection disk; 63. Connection frame; 7. One-way flow-blocking structure; 71. Flow-blocking block; 72. Telescopic inner rod; 73. Telescopic sleeve; 74. Flow-blocking spring; 8. Rotating structure; 81. Fixed plate; 82. Rotating frame; 83. Rotating wrench. Specific embodiments

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention.

[0023] Please refer to Figure 1-7As shown in the figure, this embodiment is a multi-stage ultrafiltration device, including a bottom plate 1. A protective structure 2 is fixedly connected to the upper end surface of the bottom plate 1. A filtering structure 3 is evenly and slidably connected inside the protective structure 2. A sealing structure 4 is arranged on the front end surface of the protective structure 2. A limiting structure 5 is evenly and fixedly connected to the front end surface of the sealing structure 4. Connecting structures 6 are fixedly connected to both left and right end surfaces of the protective structure 2. A one-way flow blocking structure 7 is arranged inside the connecting structure 6. An upper part of the outer surface of the one-way flow blocking structure 7 is fixedly connected with a rotating structure 8.

[0024] Furthermore, the protective structure 2 includes a protective frame 21 fixedly connected to the upper end surface of the bottom plate 1. A top plate 22 is fixedly connected to the upper end surface of the protective frame 21. Installation frames 23 are symmetrically and fixedly connected along the center line inside the protective frame 21. A sliding groove penetrating through adjacent two installation frames 23 is evenly formed on the front end surface of the installation frame 23. The filtering structure 3 is slidably connected inside the sliding groove. The left connecting frame 63 of the protective frame 21 is connected to the water inlet pipe and the right connecting frame 63 of the protective frame 21 is connected to the water outlet pipe by means of threads. This connection method facilitates the installation and disassembly of the device, and is convenient for the maintenance and repair of the device.

[0025] Furthermore, the filtering structure 3 includes a filter frame 31 slidably connected inside the sliding groove on the front end surface of the installation frame 23. A filter element 32 is fixedly connected inside the filter frame 31. The filter element 32 is specifically divided into a multi-media filter layer, an activated carbon filter layer and other filter layers according to the filtering purpose and material. Through multiple filtering structures 3 inside the protective frame 21 for multi-stage ultrafiltration, the water flow can be filtered more finely and comprehensively, improving the filtering effect, removing various impurities in the water, and making the quality of the filtered water higher.

[0026] Furthermore, the specific materials of the multi-media filter layer in the filter element 32 are respectively a quartz sand filter layer, a ceramsite filter layer and a fiber bundle filter layer. The specific materials of the activated carbon filter layer are respectively granular activated carbon, powdered activated carbon and coconut shell activated carbon. The specific materials of the other filter layers are respectively dense polypropylene, ultrafiltration membrane and ion exchange resin.

[0027] Furthermore, the sealing structure 4 includes a diversion groove 41 evenly formed on the front end surface of the protective frame 21. A sealing plate 42 is hinged to the lower end surface inside the diversion groove 41 by a hinge. A limiting frame 43 is fixedly connected to the upper part of the front end surface of the protective frame 21. A limiting structure 5 is fixedly connected to the upper part of the front end surface of the sealing plate 42. Through the sealing structure 4, the sealing performance of the device during normal filtering operation can be ensured, preventing water leakage and ensuring the normal progress of the filtering process. At the same time, the sealing operation after the replacement of the filtering structure is also relatively simple and easy to perform.

[0028] Further, the limiting structure 5 includes a sliding frame 51 fixedly connected to the upper part of the front end face of the sealing plate 42. The lower end face of the inner cavity of the sliding frame 51 is fixedly connected with a limiting spring 52. The upper end face of the limiting spring 52 is fixedly connected with a limiting insertion plate 53. The limiting insertion plate 53 is slidably connected in the inner cavity of the sliding frame 51. The upper end face of the limiting insertion plate 53 is engaged with the groove on the lower end face of the limiting frame 43. The lower part of the front end face of the limiting insertion plate 53 is fixedly connected with an adjusting block 54. By pulling the adjusting block 54 downward, the limiting insertion plate 53 slides downward, the limiting spring 52 contracts, and the sliding frame 51 is pulled to turn the sealing plate 43 downward, so that the inner cavity of the diversion groove 41 is communicated, and the sewage generated by cleaning can be effectively discharged from the equipment. The sewage discharge can be realized through simple operation, which is convenient for the sewage treatment after the equipment is cleaned.

[0029] Further, the connecting structure 6 includes transmission pipes 61 respectively fixedly connected to the left and right sides of the protective frame 21. One ends of the transmission pipes 61 far away from the protective frame 21 are fixedly connected with connecting discs 62. One ends of the connecting discs 62 far away from the transmission pipes 61 are fixedly connected with connecting frames 63. Thread grooves for connecting water pipes are provided in the inner cavities of the connecting frames 63. A one-way flow blocking structure 7 is arranged in the inner cavity of the connecting disc 62.

[0030] Further, the one-way flow blocking structure 7 includes a flow blocking block 71 placed in the inner cavity of the connecting disc 62 and engaged with the transmission pipe 61. One end of the flow blocking block 71 far away from the transmission pipe 61 is fixedly connected with a telescopic inner rod 72. A telescopic sleeve 73 is slidably connected to the outer surface of the telescopic inner rod 72. A flow blocking spring 74 is movably sleeved on the outer surfaces of the telescopic sleeve 73 and the flow blocking block 71. One end of the flow blocking spring 74 far away from the connecting frame 63 is fixedly connected with the flow blocking block 71. Through the one-way flow blocking structure 7, it is ensured that the water flow enters the inner cavity of the protective frame in a predetermined direction for filtration, effectively controlling the water flow path and preventing backflow. At the same time, the setting of the telescopic structure and the spring can adapt to the change of water flow pressure, ensuring the stable progress of the filtration process.

[0031] Further, the rotating structure 8 includes a fixing plate 81 fixedly connected to one end of the telescopic sleeve 73 far away from the flow blocking block 71. The fixing plate 81 is fixedly connected with one end of the flow blocking spring 74 far away from the flow blocking block 71. A rotating frame 82 is fixedly connected to the outer edge of one side of the fixing plate 81 close to the flow blocking block 71. The one-way flow blocking structure 7 is movably sleeved in the inner cavity of the rotating frame 82. A rotating wrench 83 is fixedly connected to the upper part of the outer surface of the rotating frame 82. The rotating wrench 83 penetrates through the connecting disc 62 and is rotatably connected. By rotating the rotating structure 8, the water flow is reversely injected into the inner cavity of the device, which is convenient for cleaning the filtering structure. The impurities attached to the filtering side of the filtering structure are washed away by the reverse water flow. A good cleaning effect can be achieved without a complicated disassembly process, improving the maintenance efficiency of the equipment and prolonging the service life of the filtering structure.

[0032] Working principle: During operation, the water inlet pipe is threadedly connected to the connecting frame 63 on the left side of the protective frame 21, and at the same time, the water outlet pipe is threadedly connected to the connecting frame 63 on the right side of the protective frame 21. When it is necessary to filter the flowing water, rotate the left rotation wrench 83, so that the one-way flow blocking structure 7 in the inner cavity of the left connecting disk 62 rotates around the rotation wrench 83, and then the flow blocking block 71 on the left one-way flow blocking structure 7 is engaged with the connecting frame 63 on the left connecting structure 6. At this time, when the water flow enters the connecting frame 63, due to the water flow pressure, the flow blocking block 71 on the one-way flow blocking structure 7 slides to the right, so the telescopic inner rod 72 contracts into the inner cavity of the telescopic sleeve 73. Therefore, the flow blocking spring 74 contracts, so that the water flow enters the inner cavity of the protective frame 21. At this time, the water flow passes through the multiple filtering structures 3 arranged in the inner cavity of the protective frame 21 to perform multi-stage ultrafiltration on the water flow. Similarly, when the water flow filtration is completed, due to the water flow pressure, the flow blocking block 71 on the one-way flow blocking structure 7 on the right side of the protective frame 21 slides to the right. Therefore, the telescopic inner rod 72 contracts into the inner cavity of the telescopic sleeve 73, and at the same time, the flow blocking spring 74 contracts, further enabling the filtered water flow to be discharged in time through the right transmission pipe 61 and the connecting frame 63. When it is necessary to clean the filtering structure 3 in the inner cavity of the protective frame 21, rotate the rotation wrenches 83 on both sides of the protective frame 21 at the same time, so that the two one-way flow blocking structures 7 rotate 180 degrees around the rotation wrenches 83 at the same time, and then connect the water inlet pipe to the connecting frame 63 on the right side of the protective frame 21. At this time, inject the water flow into the inner cavity of the device through the water inlet pipe. At this time, due to the water flow relative to the device for filtering the water flow, the water flow direction is opposite, and under the action of the water hammer pressure, the impurities attached to the side of the filtering structure 3 for water flow filtration are washed away, so that the impurities are separated from the filtering structure 3, thus completing the washing of the impurities attached to the outer surface of the filtering structure 3. When it is necessary to treat the cleaning sewage in the inner cavity of the protective structure 2, pull down the adjusting block 54 in sequence, so that the limit insertion plate 53 slides down, so the limit spring 52 contracts. Then, by pulling the sliding frame 51, the sealing plate 42 is turned downwards, so that the inner cavity of the diversion groove 41 is communicated, so as to discharge the sewage generated by the cleaning of the filtering structure 3. When the filter structure 3 needs to be replaced, repeat the above sewage discharge operation to connect the inner cavity of the diversion groove 41. At this time, pull the corresponding filter rack 31 as needed to remove the filter structure 3 from the groove on the mounting rack 23. Further, insert the new filter structure 3 into the inner cavity of the device through the groove on the mounting rack 23. At this time, pull the adjusting block 54 to make the limit insertion plate 53 slide downward, and then push the sealing plate 42 in the reverse direction to make the sealing plate 42 seal the diversion groove 41. Then release the adjusting block 54 to make the limit spring 52 extend, so that the limit insertion plate 53 slides upward, and then make the limit insertion plate 53 engage with the inner cavity of the limit frame 43, thereby realizing the limitation of the sealing structure 4. Furthermore, the placed filter structure 3 is squeezed and sealed by the sealing plate 42 and the top plate 22.

[0033] In the description of this specification, the descriptions referring to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0034] In the description of the present invention, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "couple" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0035] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A multi-stage ultrafiltration device, comprising a bottom plate (1), characterized in that; The upper end surface of the bottom plate (1) is fixedly connected to a protective structure (2), the inner cavity of the protective structure (2) is uniformly slidably connected to a filtering structure (3), the front end surface of the protective structure (2) is provided with a sealing structure (4), the front end surface of the sealing structure (4) is uniformly fixedly connected to a limiting structure (5), the left and right end surfaces of the protective structure (2) are both fixedly connected to connecting structures (6), the inner cavity of the connecting structure (6) is provided with a one-way flow blocking structure (7), and the upper portion of the outer surface of the one-way flow blocking structure (7) is fixedly connected to a rotating structure (8).

2. A multi-stage ultrafiltration device according to claim 1, characterized in that: The protection structure (2) comprises a protection frame (21) fixedly connected to the upper end surface of the bottom plate (1), the upper end surface of the protection frame (21) being fixedly connected to a top plate (22), the inner cavity of the protection frame (21) being symmetrically fixedly connected to a mounting frame (23) along a center line, the front end surface of the mounting frame (23) being evenly provided with a slide groove that passes through two adjacent mounting frames (23), and the inner cavity of the slide groove being slidably connected to a filter structure (3).

3. A multi-stage ultrafiltration device according to claim 1, characterized in that: The filtering structure (3) comprises a filtering frame (31) slidably connected to the inner cavity of the slide groove on the front end surface of the mounting frame (23); a filter element (32) is fixedly connected to the inner cavity of the filtering frame (31); the filter element (32) is specifically divided into a multi-media filtering layer, an activated carbon filtering layer and other filtering layers according to filtering purpose and material.

4. A multi-stage ultrafiltration device according to claim 1, characterized in that: The specific materials of the multi-media filter layer in the filter element (32) are quartz sand filter layer, ceramsite filter layer and fiber bundle filter layer, respectively; the specific materials of the activated carbon filter layer are granular activated carbon, powdered activated carbon and coconut shell activated carbon, respectively; and the specific materials of the other filter layers are dense polypropylene, ultrafiltration membrane and ion exchange resin, respectively.

5. A multi-stage ultrafiltration device according to claim 1, characterized in that: The sealing structure (4) comprises a guide groove (41) uniformly formed on the front end surface of the protection frame (21); a sealing plate (42) is hingedly connected to the lower end surface of the inner cavity of the guide groove (41) via a hinge; the upper portion of the front end surface of the protection frame (21) is fixedly connected to a limiting frame (43); and the upper portion of the front end surface of the sealing plate (42) is fixedly connected to the limiting structure (5).

6. A multi-stage ultrafiltration device according to claim 1, characterized in that: The limiting structure (5) comprises a sliding frame (51) fixedly connected to the upper front end surface of the sealing plate (42); a limiting spring (52) is fixedly connected to the lower end surface of the inner cavity of the sliding frame (51); a limiting plug plate (53) is fixedly connected to the upper end surface of the limiting spring (52); the limiting plug plate (53) is slidably connected to the inner cavity of the sliding frame (51); the upper end surface of the limiting plug plate (53) and the groove of the lower end surface of the limiting frame (43) are mutually engaged; and an adjusting block (54) is fixedly connected to the lower part of the front end surface of the limiting plug plate (53).

7. A multi-stage ultrafiltration device according to claim 1, characterized in that: The connection structure (6) comprises transmission pipes (61) respectively fixedly connected to the left and right sides of the protection frame (21); one end of the transmission pipe (61) away from the protection frame (21) is fixedly connected to a connection plate (62); one end of the connection plate (62) away from the transmission pipe (61) is fixedly connected to a connection frame (63); a thread groove for connecting a water pipe is provided in the inner cavity of the connection frame (63); and a one-way flow blocking structure (7) is provided in the inner cavity of the connection plate (62).

8. A multi-stage ultrafiltration device according to claim 1, characterized in that: The one-way flow blocking structure (7) comprises a flow blocking block (71) placed in the inner cavity of the connecting plate (62) and engaged with the transmission tube (61); one end of the flow blocking block (71) away from the transmission tube (61) is fixedly connected to a telescopic inner rod (72); a telescopic sleeve (73) is slidably connected to the outer surface of the telescopic inner rod (72); a flow blocking spring (74) is movably sleeved between the telescopic sleeve (73) and the outer surface of the flow blocking block (71); and one end of the flow blocking spring (74) away from the connecting frame (63) is fixedly connected to the flow blocking block (71).

9. A multi-stage ultrafiltration device according to claim 1, characterized in that: The rotating structure (8) comprises a fixed plate (81) fixedly connected to one end of the telescopic sleeve (73) away from the flow blocking block (71); the fixed plate (81) is fixedly connected to one end of the flow blocking spring (74) away from the flow blocking block (71); an outer edge of one side of the fixed plate (81) close to the flow blocking block (71) is fixedly connected to a rotating frame (82); the one-way flow blocking structure (7) is movably sleeved in the inner cavity of the rotating frame (82); a rotating wrench (83) is fixedly connected to the upper portion of the outer surface of the rotating frame (82); the rotating wrench (83) passes through the connecting plate (62) and is rotatably connected.

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