A multi-stage ultrafiltration device

Abstract

The application discloses a kind of multistage ultrafiltration equipment, it is related to water purification equipment technical field.The application, including bottom plate, the bottom plate upper end face is fixedly connected with protective structure, protective structure inner cavity evenly slidingly connected with filter structure, sealing structure front end surface evenly fixedly connected with limiting structure, protective structure left and right two side end faces are fixedly connected with connecting structure, the inner cavity of connecting structure is provided with one-way flow resistance structure, the outer surface of one-way flow resistance structure upper portion is fixedly connected with rotating structure, water inlet pipe and protective frame left side connecting frame, water outlet pipe and protective frame right side connecting frame are connected by thread, this connection mode is convenient equipment installation and disassembly, it is convenient for equipment maintenance and overhaul, by one-way flow resistance structure, it is ensured that water flow enters protective frame inner cavity and filters according to predetermined direction, effectively control water flow path, prevent backflow, the setting of telescopic structure and spring can adapt to the change of water flow pressure, guarantee the stable progress of filtration process.

Description

Technical Field

[0001] This invention relates to the field of water purification equipment technology, and in particular to a multi-stage ultrafiltration device. Background Technology

[0002] Ultrafiltration membranes are semi-permeable polymer membranes used in ultrafiltration processes to separate high-molecular-weight colloids or suspended particles of a certain size from a solution. Driven by pressure, ultrafiltration membranes are widely used in the deep treatment of industrial wastewater and process water, such as the concentration, purification and separation of macromolecules in the chemical, food and pharmaceutical industries, the sterilization of biological solutions, the separation of dyes in dyeing and printing wastewater, the recovery of glycerol from petrochemical wastewater, the recovery of silver from photographic chemical wastewater, and the preparation of ultrapure water. In addition, they can also be used for sludge concentration and dewatering.

[0003] A search revealed a Chinese invention patent, CN118289889A, which discloses an integrated multi-stage ultrafiltration membrane device for algae removal. The device includes an ultrafiltration membrane housing and an algae removal housing, with the algae removal housing positioned below the ultrafiltration membrane housing. Multiple filter elements are equidistantly arranged inside the algae removal housing. In this invention, wastewater is transported to the interior of the algae removal housing via an inlet pipe. The impact force of the wastewater causes rotating blades to rotate, directing the wastewater towards the outlet pipe. Algae are filtered and intercepted by the filter elements. Simultaneously, a rotating scraper removes algae adsorbed at the bottom of the filter elements, preventing algae from adhering to the surface of the ultrafiltration membrane fibers and clogging the micropores. This eliminates the need for frequent backwashing, thereby improving the filtration efficiency of the integrated multi-stage ultrafiltration membrane device.

[0004] Existing equipment cannot precisely control the unidirectional flow of water when it enters and exits the filter, which makes it easy for the water to flow back during use, resulting in secondary pollution of the filtered water. At the same time, the ultrafiltration equipment has a relatively complex filter structure and has dead corners for cleaning, resulting in incomplete cleaning.

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

[0006] The purpose of this invention is to provide a multi-stage ultrafiltration device that solves the problems mentioned in the background art.

[0007] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution:

[0008] This invention relates to a multi-stage ultrafiltration device, comprising a base plate, a protective structure fixedly connected to the upper surface of the base plate, a filter structure uniformly slidably connected to the inner cavity of the protective structure, a sealing structure provided on the front surface of the protective structure, a limit structure uniformly fixedly connected to the front surface of the sealing structure, a connecting structure fixedly connected to both the left and right end faces of the protective structure, a one-way flow-blocking structure provided in the inner cavity of the connecting structure, and a rotating structure fixedly connected to the upper part of the outer surface of the one-way flow-blocking structure.

[0009] Preferably, the protective structure includes a protective frame fixedly connected to the upper end face of the base plate, a top plate fixedly connected to the upper end face of the protective frame, and mounting frames symmetrically fixedly connected to the inner cavity of the protective frame along the center line. The front end face of the mounting frame is evenly provided with a sliding groove penetrating two adjacent mounting frames, and a filter structure is slidably connected to the inner cavity of the sliding groove.

[0010] Preferably, the filter structure includes a filter frame that is slidably connected to the inner cavity of the groove on the front end face of the mounting frame, and a filter element is fixedly connected to the inner cavity of the filter frame. The filter element is specifically divided into a multi-media filter layer, an activated carbon filter layer, and other filter layers according to the filtration purpose and material.

[0011] Preferably, the multi-media filtration layer in the filter element is made of quartz sand filtration layer, ceramic granule filtration layer and fiber bundle filtration layer, the activated carbon filtration layer is made of granular activated carbon, powdered activated carbon and coconut shell activated carbon, and the other filtration layers are made of dense polypropylene, ultrafiltration membrane and ion exchange resin.

[0012] Preferably, the sealing structure includes a flow guide groove evenly opened on the front end face of the protective frame, a sealing plate is hinged to the lower end face of the inner cavity of the flow guide groove via a hinge, a limit frame is fixedly connected to the upper part of the front end face of the protective frame, and a limit structure is fixedly connected to the upper part of the front end face of the sealing plate.

[0013] Preferably, the limiting structure includes a sliding frame fixedly connected to the upper part of the front end face of the sealing plate, a limiting spring fixedly connected to the lower end face of the inner cavity of the sliding frame, a limiting insert plate fixedly connected to the upper end face of the limiting spring, the limiting insert plate slidably connected to the inner cavity of the sliding frame, the upper end face of the limiting insert plate engaging with the groove of the lower end face of the limiting frame, and an adjusting block fixedly connected to the lower part of the front end face of the limiting insert plate.

[0014] Preferably, the connection structure includes transmission pipes fixedly connected to the left and right sides of the protective frame, a connecting plate fixedly connected to the end of the transmission pipe away from the protective frame, a connecting frame fixedly connected to the end of the connecting plate away from the transmission pipe, a threaded groove for connecting water pipes opened in the inner cavity of the connecting frame, and a one-way flow-blocking structure provided in the inner cavity of the connecting plate.

[0015] Preferably, the unidirectional flow-blocking structure includes a flow-blocking block placed inside the connecting plate cavity and engaging with the transmission pipe. A telescopic inner rod is fixedly connected to the end of the flow-blocking block away from the transmission pipe. A telescopic sleeve is slidably connected to the outer surface of the telescopic inner rod. A flow-blocking spring is movably sleeved between the telescopic sleeve and the outer surface of the flow-blocking block. The end of the flow-blocking spring away from the connecting frame is fixedly connected to the flow-blocking block.

[0016] Preferably, the rotating structure includes a fixed plate fixedly connected to the end of the telescopic sleeve away from the flow-blocking block, the fixed plate being fixedly connected to the end of the flow-blocking spring away from the flow-blocking block, a rotating frame being fixedly connected to the outer edge of the fixed plate near the flow-blocking block, a unidirectional flow-blocking structure being movably sleeved in the inner cavity of the rotating frame, and a rotating wrench being fixedly connected to the upper part of the outer surface of the rotating frame, the rotating wrench passing through the connecting plate and being rotatably connected.

[0017] The present invention has the following beneficial effects:

[0018] 1. This invention uses threaded connections between the inlet pipe and the left side connecting frame of the protective frame, and between the outlet pipe and the right side connecting frame of the protective frame. This connection method facilitates the installation and disassembly of the equipment, as well as its maintenance and repair. The unidirectional flow-blocking structure ensures 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 telescopic structure and spring settings can adapt to changes in water pressure, ensuring the stability of the filtration process. Through multiple filtration structures within the inner cavity of the protective frame, multi-stage ultrafiltration can be performed, allowing for finer and more comprehensive filtration of the water flow, improving the filtration effect, removing various impurities from the water, and resulting in higher quality filtered water. The unidirectional flow-blocking structure, similar to that on the inlet side, ensures the smooth discharge of filtered water, while also ensuring the unidirectionality of the entire filtration system, preventing filtered water from flowing back and affecting the filtration effect.

[0019] 2. This invention utilizes a rotating structure to reverse the water flow into the inner cavity of the device, facilitating the cleaning of the filter structure. The reverse water flow washes over the filter structure to remove impurities adhering to one side, achieving a good cleaning effect without a complex disassembly process. This improves equipment maintenance efficiency and extends the service life of the filter structure. By pulling down the adjusting block, the limiting plate slides down, the limiting spring retracts, and the sliding frame is pulled to flip the sealing plate downwards, connecting the inner cavity of the guide channel. This effectively discharges the wastewater generated during cleaning. Wastewater discharge is achieved through simple operation, facilitating wastewater treatment after equipment cleaning. The sealing structure ensures the equipment's airtightness during normal filtration operation, preventing water leakage and ensuring the normal operation of the filtration process. Furthermore, the sealing operation after filter structure replacement is also relatively simple and easy.

[0020] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a front-view stereoscopic structural diagram of the present invention;

[0023] Figure 2 This is a schematic diagram of the left side view of the three-dimensional structure of the present invention;

[0024] Figure 3 This is a schematic diagram of the transverse half-section three-dimensional structure of the present invention;

[0025] Figure 4 This is a schematic diagram of the longitudinal half-section three-dimensional structure of the present invention;

[0026] Figure 5 This is a schematic diagram of the installation structure of the unidirectional flow-blocking structure of the present invention;

[0027] Figure 6 For the present invention Figure 3 Enlarged structural diagram of region A in the middle;

[0028] Figure 7 For the present invention Figure 4 A magnified structural diagram of region B in the middle.

[0029] The attached diagram lists the components represented by each number as follows:

[0030] 1. Base plate; 2. Protective structure; 21. Protective frame; 22. Top plate; 23. Mounting 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 insert plate; 54. Adjusting block; 6. Connecting structure; 61. Transmission pipe; 62. Connecting plate; 63. Connecting frame; 7. One-way flow obstruction structure; 71. Flow obstruction block; 72. Telescopic inner rod; 73. Telescopic sleeve; 74. Flow obstruction spring; 8. Rotating structure; 81. Fixed plate; 82. Rotating frame; 83. Rotating wrench. Detailed Implementation

[0031] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0032] Please see Figure 1-7As shown, this embodiment is a multi-stage ultrafiltration device, including a base plate 1, a protective structure 2 fixedly connected to the upper end face of the base plate 1, a filter structure 3 uniformly slidably connected to the inner cavity of the protective structure 2, a sealing structure 4 provided on the front end face of the protective structure 2, a limiting structure 5 uniformly fixedly connected to the front end face of the sealing structure 4, a connecting structure 6 fixedly connected to both the left and right end faces of the protective structure 2, a one-way flow-blocking structure 7 provided in the inner cavity of the connecting structure 6, and a rotating structure 8 fixedly connected to the upper part of the outer surface of the one-way flow-blocking structure 7.

[0033] Furthermore, the protective structure 2 includes a protective frame 21 fixedly connected to the upper surface of the base plate 1. A top plate 22 is fixedly connected to the upper surface of the protective frame 21. Mounting frames 23 are symmetrically fixedly connected to the inner cavity of the protective frame 21 along the center line. The front end face of the mounting frame 23 is evenly provided with sliding grooves that penetrate two adjacent mounting frames 23. A filter structure 3 is slidably connected to the inner cavity of the sliding groove. The filter structure 3 is connected to the left connecting frame 63 of the protective frame 21 by a water inlet pipe and to the right connecting frame 63 of the protective frame 21 by a threaded connection. This connection method facilitates the installation and disassembly of the equipment and makes it convenient for the maintenance and repair of the equipment.

[0034] Furthermore, the filter structure 3 includes a filter frame 31 that is slidably connected to the inner cavity of the groove on the front end face of the mounting frame 23. A filter element 32 is fixedly connected to the inner cavity of 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 filtration purpose and material. Through the multiple filter structures 3 in the inner cavity of the protective frame 21, multi-stage ultrafiltration can be performed, which can filter the water flow more finely and comprehensively, improve the filtration effect, remove various impurities in the water, and make the filtered water of higher quality.

[0035] Furthermore, the multi-media filter layer in filter element 32 is made of quartz sand filter layer, ceramic particle filter layer and fiber bundle filter layer, respectively; the activated carbon filter layer is made of granular activated carbon, powdered activated carbon and coconut shell activated carbon, respectively; and the other filter layers are made of dense polypropylene, ultrafiltration membrane and ion exchange resin, respectively.

[0036] Furthermore, the sealing structure 4 includes a guide groove 41 evenly distributed on the front end face of the protective frame 21. A sealing plate 42 is hinged to the lower end face of the inner cavity of the guide groove 41 via a hinge. A limit frame 43 is fixedly connected to the upper part of the front end face of the protective frame 21, and a limit structure 5 is fixedly connected to the upper part of the front end face of the sealing plate 42. The sealing structure 4 can ensure the sealing of the equipment during normal filtration operation, prevent water leakage, and ensure the normal operation of the filtration process. At the same time, the sealing operation after the filter structure is replaced is also relatively simple and easy.

[0037] Furthermore, 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. A limiting spring 52 is fixedly connected to the lower end face of the inner cavity of the sliding frame 51, and a limiting insert plate 53 is fixedly connected to the upper end face of the limiting spring 52. The limiting insert plate 53 is slidably connected to the inner cavity of the sliding frame 51. The upper end face of the limiting insert plate 53 and the groove on the lower end face of the limiting frame 43 engage with each other. An adjusting block 54 is fixedly connected to the lower part of the front end face of the limiting insert plate 53. By pulling the adjusting block 54 downward, the limiting insert plate 53 slides down, the limiting spring 52 contracts, and the sliding frame 51 is pulled to make the sealing plate 43 flip downward. The inner cavity of the guide channel 41 is connected, which can effectively discharge the sewage generated during cleaning from the equipment. Sewage discharge is achieved through simple operation, which facilitates sewage treatment after equipment cleaning.

[0038] Furthermore, the connection structure 6 includes transmission pipes 61 fixedly connected to the left and right sides of the protective frame 21 respectively. A connecting plate 62 is fixedly connected to the end of the transmission pipe 61 away from the protective frame 21. A connecting frame 63 is fixedly connected to the end of the connecting plate 62 away from the transmission pipe 61. The inner cavity of the connecting frame 63 is provided with a threaded groove for connecting water pipes. A one-way flow-blocking structure 7 is provided in the inner cavity of the connecting plate 62.

[0039] Furthermore, the unidirectional flow-blocking structure 7 includes a flow-blocking block 71 placed inside the connecting plate 62 and engaging with the transmission pipe 61. A telescopic inner rod 72 is fixedly connected to the end of the flow-blocking block 71 away from the transmission pipe 61. 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. The end of the flow-blocking spring 74 away from the connecting frame 63 is fixedly connected to the flow-blocking block 71. The unidirectional flow-blocking structure 7 ensures 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 telescopic structure and spring can adapt to changes in water pressure, ensuring the stable operation of the filtration process.

[0040] Furthermore, the rotating structure 8 includes a fixed plate 81 fixedly connected to the end of the telescopic sleeve 73 away from the flow-blocking block 71. The fixed plate 81 is fixedly connected to the end of the flow-blocking spring 74 away from the flow-blocking block 71. A rotating frame 82 is fixedly connected to the outer edge of the fixed plate 81 near the flow-blocking block 71. The unidirectional 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 passes through the connecting plate 62 and is rotatably connected. By rotating the rotating structure 8, water is injected into the inner cavity of the device in the reverse direction, which facilitates cleaning of the filter structure. The reverse water flow flushes the filter structure to filter impurities attached to one side. A good cleaning effect can be achieved without a complicated disassembly process, which improves the maintenance efficiency of the equipment and extends the service life of the filter structure.

[0041] Working principle: During operation, the inlet pipe is threaded to the connecting bracket 63 on the left side of the protective frame 21, and the outlet pipe is threaded to the connecting bracket 63 on the right side of the protective frame 21.

[0042] When filtration of the flowing water is required, rotating the left-side lever 83 causes the one-way flow-blocking structure 7 inside the left-side connecting plate 62 to rotate around the lever 83. This causes the flow-blocking block 71 on the left-side one-way flow-blocking structure 7 to engage with the connecting frame 63 on the left-side connecting structure 6. When water enters the connecting frame 63, the water pressure causes the flow-blocking block 71 on the one-way flow-blocking structure 7 to slide to the right. As a result, the telescopic inner rod 72 retracts into the inner cavity of the telescopic sleeve 73, thus blocking the flow. Spring 74 contracts, allowing water to enter the inner cavity of the protective frame 21. The water then undergoes multi-stage ultrafiltration through multiple filter structures 3 within the protective frame 21. Similarly, when filtration is complete, the water pressure causes the flow-blocking block 71 on the right side of the protective frame 21 to slide to the right. This causes the telescopic inner rod 72 to retract into the telescopic sleeve 73, and simultaneously, the flow-blocking spring 74 contracts, further allowing the filtered water to be discharged promptly through the right-side transmission pipe 61 and connecting frame 63.

[0043] When cleaning the filter structure 3 inside the protective frame 21 is required, simultaneously rotate the rotating wrenches 83 on both sides of the protective frame 21, causing the one-way flow-blocking structures 7 on both sides to rotate 180 degrees around the rotating wrench 83. This connects the water inlet pipe to the connecting frame 63 on the right side of the protective frame 21. Water is then injected into the inner cavity of the device through the water inlet pipe. Because the water flow direction is opposite to the filtered water flow, and due to the water hammer pressure, impurities attached to the side of the filter structure 3 used for water filtration are flushed away, thus removing the impurities from the filter structure 3. This completes the rinsing of the impurities attached to the outer surface of the filter structure 3.

[0044] When it is necessary to treat the wastewater from cleaning the inner cavity of the protective structure 2, the adjusting block 54 is pulled down sequentially, causing the limiting plate 53 to slide downwards. This causes the limiting spring 52 to contract, which in turn pulls the sliding frame 51, causing the sealing plate 42 to flip downwards. This opens up the inner cavity of the guide channel 41, allowing the wastewater generated from cleaning the filter structure 3 to be discharged.

[0045] When the filter structure 3 needs to be replaced, repeat the above sewage discharge operation to connect the inner cavity of the guide channel 41. At this time, pull the corresponding filter frame 31 as needed to remove the filter structure 3 from the groove on the mounting frame 23. Then, insert the new filter structure 3 into the inner cavity of the device through the groove on the mounting frame 23. At this time, pull the adjusting block 54 to make the limiting plate 53 slide downward, which in turn pushes the sealing plate 42 in the opposite direction, so that the sealing plate 42 seals the guide channel 41. Then, release the adjusting block 54 to make the limiting spring 52 extend, so the limiting plate 53 slides upward, which makes the limiting plate 53 engage with the inner cavity of the limiting frame 43, thereby limiting the sealing structure 4. Then, the sealing plate 42 and the top plate 22 squeeze and seal the placed filter structure 3.

[0046] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0047] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0048] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. 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 multi-stage ultrafiltration device, comprising a base plate (1), characterized in that; The base plate (1) is fixedly connected to the upper end face of the protective structure (2), the inner cavity of the protective structure (2) is uniformly slidably connected to the filter structure (3), the front end face of the protective structure (2) is provided with the sealing structure (4), the front end face of the sealing structure (4) is uniformly fixedly connected to the limit structure (5), the left and right end faces of the protective structure (2) are both fixedly connected to the connecting structure (6), the inner cavity of the connecting structure (6) is provided with the one-way flow blocking structure (7), and the upper part of the outer surface of the one-way flow blocking structure (7) is fixedly connected to the rotating structure (8). The protective structure (2) includes a protective frame (21) fixedly connected to the upper end face of the base plate (1), a top plate (22) fixedly connected to the upper end face of the protective frame (21), and mounting frames (23) symmetrically fixedly connected to the inner cavity of the protective frame (21) along the center line. The front end face of the mounting frame (23) is evenly provided with a sliding groove that penetrates two adjacent mounting frames (23), and a filter structure (3) is slidably connected to the inner cavity of the sliding groove. The connection structure (6) includes transmission pipes (61) fixedly connected to the left and right sides of the protective frame (21), and a connecting plate (62) fixedly connected to the end of the transmission pipe (61) away from the protective frame (21). A connecting frame (63) is fixedly connected to the end of the connecting plate (62) away from the transmission pipe (61). The inner cavity of the connecting frame (63) is provided with a threaded groove for connecting water pipes, and the inner cavity of the connecting plate (62) is provided with a one-way flow-blocking structure (7). The unidirectional flow-blocking structure (7) includes a flow-blocking block (71) placed inside the connecting plate (62) and engaging with the transmission pipe (61). A telescopic inner rod (72) is fixedly connected to one end of the flow-blocking block (71) away from the transmission pipe (61). 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). The end of the flow-blocking spring (74) away from the connecting frame (63) is fixedly connected to the flow-blocking block (71). The rotating structure (8) includes a fixed plate (81) fixedly connected to the end of the telescopic sleeve (73) away from the flow blocking block (71). The fixed plate (81) is fixedly connected to the end of the flow blocking spring (74) away from the flow blocking block (71). A rotating frame (82) is fixedly connected to the outer edge of the fixed plate (81) near the flow blocking block (71). A 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) passes through the connecting plate (62) and is rotatably connected.

2. The multi-stage ultrafiltration device according to claim 1, characterized in that, The filter structure (3) includes a filter frame (31) that is slidably connected to the inner cavity of the slide groove on the front end face of the mounting frame (23). A filter element (32) is fixedly connected to the inner cavity of 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 filtration purpose and material.

3. The multi-stage ultrafiltration device according to claim 2, characterized in that, The specific materials of the multi-media filter layer in the filter element (32) are quartz sand filter layer, ceramic particle 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.

4. The multi-stage ultrafiltration device according to claim 1, characterized in that, The sealing structure (4) includes a guide groove (41) evenly opened on the front end face of the protective frame (21). The lower end face of the inner cavity of the guide groove (41) is hinged to a sealing plate (42). A limit frame (43) is fixedly connected to the upper part of the front end face of the protective frame (21). A limit structure (5) is fixedly connected to the upper part of the front end face of the sealing plate (42).

5. A multi-stage ultrafiltration device according to claim 1, characterized in that, 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). A limiting spring (52) is fixedly connected to the lower end face of the inner cavity of the sliding frame (51). A limiting insert plate (53) is fixedly connected to the upper end face of the limiting spring (52). The limiting insert plate (53) is slidably connected to the inner cavity of the sliding frame (51). The upper end face of the limiting insert plate (53) and the groove of the lower end face of the limiting frame (43) engage with each other. An adjusting block (54) is fixedly connected to the lower part of the front end face of the limiting insert plate (53).

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