Scratch-resistant polyvinylidene fluoride composite film and membrane filtration device

Abstract

The application belongs to the technical field of membrane filtration, and particularly relates to a membrane filtration device with a safety alarm function, which comprises: a shell, a filtering and plugging mechanism arranged in the shell; and a driving assembly arranged at the top of the shell and in transmission connection with the filtering and plugging mechanism. The driving assembly can be used to control the switching of the filtering condition and the plugging condition of the equipment. In the filtering condition, the driving assembly cooperates with the filtering and plugging mechanism to enable the medium to be normally filtered, and meanwhile, the sealing and scraping assembly is linked to realize the global sealing of the equipment, so that the medium is prevented from leaking and the filtering sealing property and the filtering effect are stably ensured. At this time, the self-cleaning assembly synchronously closes the top channel of the membrane filter cartridge to ensure the airtightness and stability of the filtering operation, and the safety alarm mechanism monitors the impurity adhesion state on the surface of the membrane filter cartridge throughout the process. In the plugging condition, after the driving assembly completes the switching and locking of the working condition, the sealing and scraping assembly and the self-cleaning assembly can be synchronously triggered.

Description

Technical Field

[0001] This invention belongs to the field of membrane filtration technology, and particularly relates to a scratch-resistant polyvinylidene fluoride composite membrane and a membrane filtration device. Background Technology

[0002] Currently, with the accelerated digital and intelligent transformation and upgrading of the environmental protection industry, water treatment has become a core and essential link in the fields of water environment management, municipal water supply and drainage, industrial fluid purification and chemical separation. Membrane filtration technology, with its outstanding advantages such as high separation accuracy, good filtration stability and wide applicability, has become one of the most widely used core technologies in current water treatment processes. As a key component of membrane filtration devices for solid-liquid separation and water purification, the operating status, filtration efficiency and cleaning and maintenance effect of the membrane filter cartridge directly determine the working efficiency of the entire water treatment system.

[0003] Traditional membrane filtration devices still suffer from several technical shortcomings and application limitations: First, their functions are limited, with most only possessing basic static filtration capabilities. They cannot flexibly switch between filtration and clogging modes according to production needs, making it difficult to adapt to online self-cleaning and shutdown clogging isolation. Their adaptability and versatility are poor. Second, traditional devices lack integrated sealing and scraping structures, making them prone to media leakage and side leakage during filtration. Their sealing stability is insufficient, and long-term operation can lead to internal dirt accumulation and component corrosion and aging. Third, membrane filter cartridges easily accumulate impurities and dirt on their surfaces during long-term filtration. Conventional manual cleaning or simple rinsing methods have blind spots, making it impossible to achieve comprehensive cleaning. Furthermore, it is difficult to synchronize mechanical scraping and water rinsing, resulting in incomplete cleaning, secondary impurity adhesion, and significantly shortening the service life of the membrane filter cartridges. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned technical problems by providing a membrane filtration device with a safety alarm function, achieving both safety alarm and self-cleaning effects.

[0005] In view of this, the present invention provides a scratch-resistant polyvinylidene fluoride composite membrane, the composite membrane being cylindrical and comprising a separation functional layer, a porous support layer, and a reinforcing skeleton layer arranged sequentially from the outside to the inside; The separation functional layer forms the outer wall surface of the composite membrane, which is used to contact and cooperate with the scraping component and withstand its scraping. The hydrophilic modified component is distributed in the interior of the separation functional layer and the porous support layer in a bulk blending manner, and is at least distributed on the pore wall surface of the separation functional layer, rather than being attached only to the outer surface of the separation functional layer in the form of a surface coating layer, so that the newly exposed film surface and newly exposed pore walls after the separation functional layer is scraped off layer by layer by the scraping component are still hydrophilic.

[0006] A membrane filtration device with a safety alarm function includes: The outer casing contains a filter sealing mechanism. A drive assembly is located on the top of the housing and is connected to the filter blocking mechanism for driving the filter blocking mechanism to switch between filtration mode and blocking mode. A sealing scraper assembly is installed on the filter clogging mechanism. During filtration, the sealing scraper assembly seals the filter clogging mechanism to prevent sewage from seeping into its gaps. During clogging, the sealing scraper assembly adheres to the outer wall of the membrane filter cartridge and scrapes and cleans its outer wall as the membrane filter cartridge rotates. The self-cleaning component is located on the outside of the membrane filter cartridge. In filtration mode, the self-cleaning component blocks the top channel of the membrane filter cartridge to prevent sewage from overflowing. In the blocking mode, the self-cleaning component opens the top channel of the membrane filter cartridge and diverts clean water to the outside of the membrane filter cartridge to discharge the scraped impurities. A safety alarm mechanism is installed inside the housing and extends through the top of the housing. It is used to monitor the operating status of the membrane filter cartridge. When the safety alarm mechanism is triggered, the filter blocking mechanism is switched to blocking mode by the drive component. Clean water is introduced into the filter blocking mechanism in conjunction with the self-cleaning component and the sealing scraping component to remove impurities.

[0007] Furthermore, the filter sealing mechanism includes a top cover, which is detachably installed on the top of the outer shell. An inner cylinder is rotatably disposed in the middle of the outer shell, and a plurality of first through holes are opened in the middle of the inner cylinder. The membrane filter cartridge is sleeved and assembled on the outside of the inner cylinder, and the membrane filter cartridge is correspondingly disposed with the first through holes on the inner cylinder. An inner cover is sleeved on the outside of the membrane filter cartridge, and a plurality of second grooves are opened on the outer periphery of the inner cover. An outer cover is sleeved on the outside of the inner cover, and a plurality of first grooves are opened on the outer periphery of the outer cover. The number of first grooves and second grooves is the same. A through-type third groove is opened at the bottom of the inner cover, and a through-type fourth groove is opened at the bottom of the outer cover. In the filtration condition, the third groove and the fourth groove are staggered; in the sealing condition, the third groove and the fourth groove are aligned with each other.

[0008] Furthermore, a bracket is fixedly connected to the top of the top cover, and a motor is fixedly installed at the other end of the bracket. A gear is fixedly connected to the drive end of the motor, and the gear meshes with a third toothed ring. The third toothed ring is fixedly installed on the top of the inner cylinder to drive the membrane filter cartridge to rotate, so that the outer periphery of the membrane filter cartridge is continuously aligned with the first and second grooves, ensuring that sewage fully permeates and filters to the outer periphery of the membrane filter cartridge.

[0009] Furthermore, the drive assembly includes an outer cylinder, which is rotatably mounted on the outer side of the top of the inner cylinder, and the bottom end of the outer cylinder penetrates through the top cover. A connecting cover is fixedly connected to one end of the outer cylinder at the bottom of the top cover. The connecting cover is detachably mounted on the top of the outer cylinder. A lever is fixedly connected to the top of the outer cylinder, and a handle is fixedly connected to the other end of the lever. A through-hole is provided on the lever, and a limit rod is inserted into the limit hole. A first spring is sleeved on one end of the limit rod, and the two ends of the first spring are fixedly connected to the outer wall of the limit rod and the corresponding outer wall of the lever, respectively. The top cover has two positioning holes, which correspond to the ends of the limit rods. The positions of the two positioning holes are for the filtration mode and the sealing mode, respectively.

[0010] Furthermore, the sealing scraping assembly includes multiple first guide plates and multiple second guide plates. The first and second guide plates are respectively fixedly disposed on both sides of the second groove. The cross-sections of two corresponding first and second guide plates are arranged in a figure-eight shape on the outer periphery of the membrane filter cartridge. Each of the first and second guide plates has a through movable groove. The two ends of the movable groove correspond to the outer cover and the membrane filter cartridge, respectively. A squeezing part is provided at the end of the movable groove near the outer cover, and a cleaning part is provided at the end of the movable groove near the membrane filter cartridge. A notch is provided on the top of the outer side of each first and second guide plate. A collar is fitted on the outside of the notch. The outer side of the collar is fixedly connected to the inner wall of the outer cover. Multiple equally spaced docking parts, guiding parts, and protrusions are provided on the inner side of the collar. The thickness of the docking part relative to the outer side of the collar is less than the thickness of the protrusion relative to the outer side of the collar. The thickness of the guiding part increases sequentially from the docking part to the protrusion. The docking part corresponds to the filtration condition, and the protrusion corresponds to the sealing condition.

[0011] Furthermore, each of the first guide plates and the second guide plates is fixedly connected to an upper concentrator box at its top and a lower concentrator box at its bottom. The bottom of the upper concentrator box and the top and bottom of the lower concentrator box are each provided with a second through hole, which can guide and discharge clean water under the sealing condition.

[0012] Furthermore, the self-cleaning component includes a fifth slot located at the top of the upper collection box. A through-hole support is located at the top of the upper collection box, and a support rod is slidably connected within the support hole. A sealing plate is fixedly connected to the top of the support rod, corresponding to the fifth slot. A guide vane, spiral in shape, is fixedly connected to one end of the sealing plate. A lifting rod, L-shaped, is fixedly connected to the top of the guide vane. A threaded rod is rotatably connected to the other end of the lifting rod, and a threaded cylinder is threadedly connected to the other end of the threaded rod. The threaded cylinder is rotatably mounted at the bottom of the top cover. A first toothed ring is fixedly connected to the outer circumference of the threaded cylinder, and a second toothed ring is fixedly connected to the bottom end of the outer cylinder. The second toothed ring meshes with the first toothed ring. When the lever is turned, the threaded cylinder rotates synchronously, thereby lifting the threaded rod, lifting rod, guide vane, and sealing plate upwards, causing the sealing plate to disengage from the fifth slot. Cleaning water can be introduced between the inner cylinder and the membrane filter cartridge through the open channel, and the spiral guide vane accelerates water circulation, improving cleaning efficiency.

[0013] Furthermore, the top of the connecting cover is connected to a first pipe, the other end of which penetrates the outer shell. The connecting cover is provided with an anti-collision groove. The first pipe is used to introduce cleaning water, and the anti-collision groove is used to avoid motion interference between the threaded cylinder and the cover.

[0014] Furthermore, the top of the outer shell is connected to a second pipe, the water outlet height of the second pipe is less than the horizontal height of the top of the connecting cover, the bottom of the outer shell is funnel-shaped, a sealing ring is fixedly installed on the bottom of the inner wall of the outer shell, the sealing ring is correspondingly located at the upper end of the funnel section of the outer shell, and the sealing ring abuts against the bottom of the outer cover, a slag discharge pipe is sleeved on the outer side of the bottom of the inner cylinder, the space between the slag discharge pipe and the inner cavity of the device is used to discharge clean water and scraped impurities, the funnel structure at the bottom of the outer shell can collect fluid and impurities, and facilitate unified discharge.

[0015] Furthermore, the safety alarm mechanism includes a transparent cover, which is fixedly installed on the top of the outer shell. The inner cavity of the transparent cover is connected to the inner cavity of the outer shell. A top head is slidably connected inside the transparent cover. The top of the top head has an isosceles trapezoidal cross-section. A connecting rod is fixedly connected to one end of the top head facing the top cover. A float plate is fixedly connected to the other end of the connecting rod. The float plate is disposed inside the outer shell. A through-type mounting groove is opened on the top of the transparent cover. A button arm is rotatably disposed in the mounting groove. The button arm is generally L-shaped. An alarm box is disposed outside the mounting groove. The alarm box is fixedly installed on the top of the transparent cover. An alarm is fixedly installed at the bottom of the alarm box. The end of the button arm facing the alarm corresponds to the switch of the alarm. A second spring is fixedly installed at the end of the button arm facing the alarm. The other end of the second spring is fixedly connected to the side wall of the alarm box. A cover is detachably installed on the top of the alarm box.

[0016] The beneficial effects of this invention are: Regarding the membrane material, the hydrophilic component is distributed throughout the membrane cross-section in a bulk blending manner, rather than as a surface coating layer. After the surface layer is scraped off by a scraper, the newly exposed membrane surface remains hydrophilic, which solves the problems of peeling of the modified layer and contact angle rebound of existing surface-modified membranes under mechanical scraping conditions. This allows mechanical scraping cleaning to be repeated within the thickness margin of the separation functional layer 141 without losing its hydrophilicity.

[0017] In terms of equipment, the drive component allows for switching between filtration and clogging modes. In filtration mode, the drive component works with the clogging mechanism to ensure normal media filtration, while simultaneously linking with the sealing scraper component to achieve full-area sealing, preventing media leakage and ensuring stable filtration sealing and effectiveness. At this time, the self-cleaning component simultaneously closes the top channel of the membrane filter cartridge to ensure the airtightness and stability of the filtration operation, and the safety alarm mechanism monitors the surface of the membrane filter cartridge for the entire process of impurity adhesion. In clogging mode, after the drive component completes the mode switching and locking, it can simultaneously trigger the sealing scraper component and the self-cleaning component. The sealing scraper component adheres to the outer wall of the membrane filter cartridge and performs mechanical scraping and cleaning as the cartridge rotates, while the self-cleaning component opens the top channel of the membrane filter cartridge to introduce cleaning water, forming a combination of mechanical scraping and high-pressure water flushing to thoroughly remove impurities adhering to the inner wall of the cartridge, completely eliminating cleaning blind spots and solving the problems of asynchronous and incomplete cleaning. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of a membrane filtration device with a safety alarm function proposed in this invention. Figure 2 This is a schematic diagram of the membrane filter cartridge drive structure of a membrane filtration device with a safety alarm function proposed in this invention; Figure 3 This is a schematic diagram of the drive component structure of a membrane filtration device with a safety alarm function proposed in this invention; Figure 4 This is a schematic diagram of the self-cleaning component drive end and the drive component cooperation structure of a membrane filter device with safety alarm function proposed in this invention; Figure 5 This is a schematic diagram of the collar and extrusion section of a membrane filter device with a safety alarm function proposed in this invention; Figure 6 This is a schematic diagram of the self-cleaning component of a membrane filtration device with a safety alarm function proposed in this invention. Figure 7 This is a schematic diagram of the distribution structure of the third and fourth tanks of a membrane filtration device with a safety alarm function proposed in this invention; Figure 8This is a schematic diagram of the cross-sectional structure of the first guide plate and the second guide plate of a membrane filtration device with a safety alarm function proposed in this invention; Figure 9 This is a schematic diagram of the cross-sectional structure of the collar and the extrusion section of a membrane filter device with a safety alarm function proposed in this invention; Figure 10 This is a schematic diagram of the driving and self-cleaning components of a membrane filtration device with a safety alarm function proposed in this invention. Figure 11 This is a schematic diagram of the sealing plate and the fifth groove of a membrane filter device with a safety alarm function proposed in this invention; Figure 12 This is a schematic diagram of the cross-sectional structure of the guide vanes of a membrane filtration device with a safety alarm function proposed in this invention; Figure 13 This is a schematic diagram of the safety alarm mechanism of a membrane filtration device with a safety alarm function proposed in this invention; Figure 14 This is a schematic diagram of the cross-sectional structure of the safety alarm mechanism of a membrane filtration device with a safety alarm function proposed in this invention; Figure 15 This is a schematic diagram of the triggering mechanism of the safety alarm mechanism of a membrane filtration device with a safety alarm function proposed in this invention; Figure 16 This is a schematic diagram of the overall cross-sectional structure of a membrane filtration device with a safety alarm function proposed in this invention; Figure 17 This is a schematic diagram of the composition of a scratch-resistant polyvinylidene fluoride composite membrane proposed in this invention.

[0019] The markings in the diagram are as follows: 1. Outer shell; 11. Top cover; 12. Inner cylinder; 13. Outer cylinder; 14. Membrane filter cartridge; 15. First tube; 16. Second tube; 17. First through hole; 18. Slag discharge pipe; 2. Outer cover; 21. First groove; 22. Inner cover; 23. Second groove; 24. Connecting cover; 25. Anti-collision groove; 26. First guide plate; 27. Second guide plate; 3. Movable groove; 31. Squeezing section; 32. Cleaning section; 33. Notch; 34. Collar; 35. Connecting section; 36. Guiding section; 37. Protrusion; 38. Third groove; 39. Fourth groove; 4. Upper collection box; 41. Lower collection box; 42. Second through hole 43. Hole; 44. Fifth groove; 45. Guide vane; 46. Sealing plate; 47. Lifting rod; 48. Threaded rod; 49. Threaded cylinder; 50. First toothed ring; 51. Toggle lever; 52. Handle; 53. Second toothed ring; 54. Limiting hole; 55. Limiting rod; 56. First spring; 57. Positioning hole; 58. Support hole; 69. Support rod; 60. Bracket; 61. Motor; 62. Gear; 63. Third toothed ring; 64. Sealing ring; 75. Transparent cover; 76. Top head; 77. Connecting rod; 78. Float plate; 79. Mounting groove; 70. Button arm; 71. Alarm box; 72. Alarm; 73. Second spring. Detailed Implementation

[0020] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0021] In the description of this application, it should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. For ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0022] It should be noted that the terms "first," "second," etc., used in the specification of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class, without limiting the number of objects; for example, the first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0023] It should be noted that in the description of this application, the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this application. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0024] It should be noted that, in this application, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0025] Reference Figures 1 to 16 This is the first embodiment of the present invention, which provides a membrane filtration device with a safety alarm function that can achieve a self-cleaning effect, comprising: The outer casing 1 contains a filter sealing mechanism. The drive component is located on the top of the housing 1 and is connected to the filter blocking mechanism for driving the filter blocking mechanism to switch to the filtration mode or the blocking mode. The sealing scraper assembly is installed on the filter clogging mechanism. During filtration, the sealing scraper assembly seals the filter clogging mechanism to prevent sewage from seeping into its gaps. During clogging, the sealing scraper assembly adheres to the outer wall of the membrane filter cartridge 14 and scrapes and cleans its outer wall as the membrane filter cartridge 14 rotates. The self-cleaning component is located on the outside of the membrane filter cartridge 14. Under filtration conditions, the self-cleaning component blocks the top channel of the membrane filter cartridge 14 to prevent sewage from overflowing. Under the blocking condition, the self-cleaning component opens the top channel of the membrane filter cartridge 14 and diverts clean water to the outside of the membrane filter cartridge 14 to discharge the scraped impurities. The safety alarm mechanism is located inside the housing 1 and extends through the top of the housing. It is used to monitor the operating status of the membrane filter cartridge 14. When the safety alarm mechanism is triggered, the filter blocking mechanism is switched to the blocking mode through the drive component. Clean water is introduced into the filter blocking mechanism in conjunction with the self-cleaning component and the sealing scraping component to achieve the discharge of impurities.

[0026] This application mainly consists of a filter plugging mechanism, a drive component, a sealing scraping component, a self-cleaning component, and a safety alarm mechanism. The drive component can switch between two core operating states. The first is the filtration operating state: the drive component controls the equipment to open the filtration path, the filter plugging mechanism normally conducts material, the sealing scraping component seals the equipment gaps to prevent material leakage, and simultaneously the self-cleaning component closes the top channel of the membrane filter cartridge 14 to ensure a sealed filtration environment, allowing material to be filtered only through the membrane filter cartridge 14. The safety alarm mechanism monitors the media flow throughout the process. The second is the plugging and cleaning state. Operating status: When the membrane filter cartridge 14 is clogged and needs cleaning, the operating conditions are switched by the drive component, and the equipment automatically enters the clogging state and stops the filtration operation. The sealing scraping component automatically adheres to the outer wall of the membrane filter cartridge 14 and scrapes off the dirt and impurities attached to the outer wall as the filter cartridge rotates. The self-cleaning component simultaneously opens the top channel of the filter cartridge and automatically introduces cleaning water to flush the inside of the filter cartridge. This achieves synchronous linkage between mechanical scraping and water flushing for thorough cleaning of the filter cartridge. Throughout the filtration and cleaning process, the safety alarm mechanism monitors the entire process. Once filter cartridge clogging or abnormal material flow is detected, an alarm is immediately triggered to remind staff to carry out maintenance.

[0027] In the example of this application, the filter blocking mechanism includes a top cover 11, which is detachably mounted on the top of the outer shell 1 by bolts. An inner cylinder 12 is rotatably arranged in the middle of the outer shell 1 via a bearing. A plurality of first through holes 17 are opened in the middle of the inner cylinder 12. A membrane filter cartridge 14 is sleeved and assembled on the outside of the inner cylinder 12, and the membrane filter cartridge 14 is corresponding to the first through holes 17 provided on the inner cylinder 12. An inner cover 22 is sleeved on the outside of the membrane filter cartridge 14. A plurality of second grooves 23 are opened on the outer periphery of the inner cover 22. An outer cover 2 is sleeved on the outside of the inner cover 22. A plurality of first grooves 21 are opened on the outer periphery of the outer cover 2. The number of first grooves 21 and second grooves 23 is the same. A through third groove 38 is opened at the bottom of the inner cover 22, and a through fourth groove 39 is opened at the bottom of the outer cover 2. In the filtration condition, the third groove 38 and the fourth groove 39 are staggered; in the blocking condition, the third groove 38 and the fourth groove 39 are aligned with each other.

[0028] As a preferred example of the present invention, the top cover 11 can be freely disassembled, facilitating maintenance and replacement of internal parts by staff; the through holes on the inner cylinder 12 correspond to the membrane filter cartridge 14, ensuring that sewage can be filtered normally; during normal filtration, the grooves at the bottom of the inner cover 22 and the outer cover 2 are misaligned, sealing the internal cavity of the equipment, and sewage can only be filtered through the membrane filter cartridge 14 without turbulence or leakage; when cleaning and sewage discharge are required, the inner and outer covers 2 rotate relative to each other, and the bottom grooves are fully aligned, opening the internal cavity channel of the equipment, allowing clean water and impurities to be discharged; at the same time, the sealing scraping assembly completes the sealing of the entire machine, ensuring stable filtration operation; when the drive assembly switches to the sealing and cleaning mode, the inner and outer covers 2 rotate relative to each other, and the grooves are misaligned for sealing, ensuring the sealing of the filtration operation.

[0029] In the example of this application, a bracket 6 is fixedly connected to the top of the top cover 11, and a motor 61 is fixedly installed at the other end of the bracket 6. A gear 62 is fixedly connected to the drive end of the motor 61, and a third toothed ring 63 is engaged with the gear 62. The third toothed ring 63 is fixedly installed on the top of the inner cylinder 12 to drive the membrane filter cartridge 14 to rotate, so that the outer periphery of the membrane filter cartridge 14 is continuously aligned with the first groove 21 and the second groove 23, ensuring that sewage can fully permeate and filter the outer periphery of the membrane filter cartridge 14.

[0030] As a preferred example of the present invention, after the motor 61 is started, it drives the third gear ring 63 to rotate through the meshing of the gear 62, thereby driving the inner cylinder 12 and the outer membrane filter cartridge 14 to rotate continuously at a constant speed. The membrane filter cartridge 14 of this device rotates continuously, and the surface of the filter screen will continuously and alternately align with the filter slots of the inner and outer covers 2, so that the sewage evenly covers the entire area of ​​the filter screen and permeates and filters in all directions, avoiding the problems of local filter screen being blocked by pressure for a long time and local filter screen being idle.

[0031] In the example of this application, the drive assembly includes an outer cylinder 13, which is rotatably mounted on the outer side of the top of the inner cylinder 12 via a bearing, and the bottom end of the outer cylinder 13 penetrates the top cover 11. A connecting cover 24 is fixedly connected to one end of the outer cylinder 13 at the bottom of the top cover 11. The connecting cover 24 is detachably mounted on the top of the outer cylinder 13 via bolts. A lever 5 is fixedly connected to the top of the outer cylinder 13, and a handle 51 is fixedly connected to the other end of the lever 5. A through limiting hole 53 is provided on the lever 5, and a limiting rod 54 is inserted into the limiting hole 53. A first spring 55 is sleeved on one end of the limiting rod 54, and the two ends of the first spring 55 are fixedly connected to the outer wall of the limiting rod 54 and the corresponding outer wall of the lever 5, respectively. The top cover 11 has two positioning holes 56, which correspond to the ends of the limiting rod 54. The positions of the two positioning holes 56 are for the filtration condition and the sealing condition, respectively.

[0032] As a preferred example of the present invention, when switching to the filtration mode, the drive component can be locked by the spring on the lever 5, and the linkage filter sealing mechanism opens the filtration passage, the linkage sealing scraper component completes the sealing of the whole machine, and the linkage self-cleaning component closes the top water passage. All structures enter the filtration state simultaneously, ensuring the filtration operation is sealed and stable. When switching to the sealing and cleaning mode, while locking the sealing state, the drive component can not only link the sealing scraper component to adaptively deform and fit the inner wall of the filter cartridge, but also link the self-cleaning component to automatically open the top water passage and introduce clean water.

[0033] In the example of this application, the sealing scraping assembly includes multiple first guide plates 26 and multiple second guide plates 27. The first guide plates 26 and second guide plates 27 are respectively fixedly disposed on both sides of the second groove 23. The cross-sections of two corresponding first guide plates 26 and second guide plates 27 are arranged in a V-shape on the outer periphery of the membrane filter cartridge 14. Each of the first guide plates 26 and second guide plates 27 has a through movable groove 3. The two ends of the movable groove 3 correspond to the outer cover 2 and the membrane filter cartridge 14, respectively. The end of the movable groove 3 near the outer cover 2 is provided with a squeezing part 31, and the end of the movable groove 3 near the membrane filter cartridge 14 is provided with a cleaning part. Part 32, each of the first guide plate 26 and the second guide plate 27 has a notch 33 on its outer top. A collar 34 is fitted on the outside of the notch 33. The outer side of the collar 34 is fixedly connected to the inner wall of the outer cover 2. The inner side of the collar 34 is provided with a plurality of equally spaced docking parts 35, guide parts 36 and protrusions 37. The thickness of the docking part 35 relative to the outer side of the collar 34 is less than the thickness of the protrusion 37 relative to the outer side of the collar 34. The thickness of the guide part 36 increases sequentially from the docking part 35 to the protrusion 37. The docking part 35 corresponds to the filtration condition and the protrusion 37 corresponds to the sealing condition.

[0034] As a preferred example of the present invention, in the filtration mode, the thinner connecting part 35 of the collar 34 fits into the gaps in the equipment structure, sealing all gaps and completely preventing sewage from seeping into the gaps, thus avoiding problems such as dirt accumulation in the gaps, corrosion of parts, and bacterial growth. When switching to the clogging and cleaning mode, the guide part 36 of the collar 34 with a gradually changing thickness smoothly transitions to the protrusion 37, adaptively pushing the guide plate to move, so that the cleaning part 32 of the guide plate fits tightly against the outer wall of the membrane filter cartridge 14. As the membrane filter cartridge 14 continues to rotate, the guide plate can scrape away impurities and dirt attached to the outer wall of the filter screen in all directions, without any cleaning dead corners. When the equipment switches to the clogging and cleaning mode, in conjunction with the rotation of the filter cartridge driven by the transmission structure, the collar 34 adapts to deformation through a gradually changing structure, so that the guide plate fits tightly against the outer wall of the filter cartridge, and mechanically scrapes dirt in sync with the rotation of the filter cartridge.

[0035] It should be noted that the extrusion section 31 has high elasticity, sealing and water-stopping properties, resistance to sewage corrosion, good extrusion rebound, and anti-aging properties, and can be made of EPDM rubber. The cleaning unit 32 features a flexible, non-scratch-resistant membrane filter cartridge 14 with a membrane layer, strong scraping ability, corrosion resistance, non-fouling properties, and self-lubrication. It can be made of modified flexible polyurethane (PU) material. The cleaning unit 32 adheres to the outer wall of the membrane filter cartridge 14 during the clogging process and scrapes it as it rotates. This working method places different requirements on the outer surface of the membrane filter cartridge 14 compared to conventional separation membranes: the separation functional layer of conventional organic separation membranes is typically only submicron to several micrometers thick, designed to achieve high flux and high rejection rate rather than withstand mechanical wear. Once continuously scraped by a solid scraper, it is prone to fuzzing, scratches, and even pores. Furthermore, the surface-coated hydrophilic modified layer commonly used in existing separation membranes is only physically adsorbed or weakly bonded to the outermost surface of the membrane. Under scraping conditions, this entire layer will peel off within hundreds of cycles, and the water contact angle on the membrane surface will immediately rebound to the unmodified level. Therefore, if the membrane filter cartridge 14 uses a conventional separation membrane, the mechanical scraping self-cleaning solution of this application is difficult to implement in the long term. For this reason, this embodiment has made targeted designs on the material and layer structure of the membrane filter cartridge 14.

[0036] Reference Figure 17The membrane filter cartridge 14 is a cylindrical polyvinylidene fluoride composite semi-permeable membrane, comprising a separation functional layer 141, a porous support layer 142, and a reinforcing skeleton layer 143 arranged sequentially from the outside to the inside. The separation functional layer 141 forms the outer wall of the membrane filter cartridge 14, contacts and engages with the cleaning section 32, and withstands its scraping. The porous support layer 142 is a porous polyvinylidene fluoride core layer, providing the required flux and retention accuracy for separation. The reinforcing skeleton layer 143 is a braided tube or mesh woven from polyethylene terephthalate fibers or polyvinylidene fluoride fibers, used to withstand tensile, tear, and creep loads, allowing the separation functional layer 141 to withstand scraping contact stress while maintaining a thin profile. In the example of this application, the thickness of the separation functional layer 141 is 0.02 mm to 0.15 mm, the thickness of the porous support layer 142 is 0.15 mm to 0.8 mm and the porosity is 70% to 85%, and the thickness of the reinforcing skeleton layer 143 is 0.2 mm to 0.6 mm. Since this device adopts external pressure filtration, sewage permeates from the outer periphery of the membrane filter cartridge 14 from the outside to the inside, and impurities are trapped on the outer surface of the membrane filter cartridge 14. Therefore, the separation functional layer 141 simultaneously plays the triple role of separation surface, contaminated surface and scraped surface. Placing it on the outermost layer satisfies the filtration sequence of separation first and support second from the outside to the inside, and also combines the scraped surface and the contaminated surface into one.

[0037] In the example of this application, the Shore D hardness of the separation functional layer 141 is 55D to 75D, and the Shore A hardness of the cleaning part 32 is 70A to 90A. The hardness of the cleaning part 32 is lower than the surface hardness of the separation functional layer 141, so that wear occurs in the cleaning part 32 rather than the separation functional layer 141 during the scraping process.

[0038] In the examples of this application, the hydrophilic modification component contained in the membrane filter cartridge 14 is used in an amount of 3 to 15 parts by weight, preferably 6 to 12 parts by weight, based on 100 parts by weight of polyvinylidene fluoride resin. The hydrophilic modification component can be selected from one or more of polyvinylidene fluoride-grafted polymethacrylic acid amphiphilic graft copolymers, polyvinylidene fluoride-grafted polyethylene glycol methacrylate amphiphilic graft copolymers, polyvinylpyrrolidone, polyethylene glycol, and poloxamer. As a preferred example of the present invention, the hydrophilic modification component is selected from polyvinylidene fluoride-grafted polymethacrylic acid amphiphilic graft copolymers or polyvinylidene fluoride-grafted polyethylene glycol methacrylate amphiphilic graft copolymers. These amphiphilic graft copolymers contain a polyvinylidene fluoride backbone isomorphic to the bulk resin, which can co-crystallize with the polyvinylidene fluoride resin of the porous support layer 142 during film formation, thereby anchoring the hydrophilic segments inside the membrane rather than allowing them to float freely within the membrane through physical encapsulation. Under scraping conditions, the membrane surface is constantly scraped away and new interfaces are continuously exposed. There is a risk that hydrophilic components will be lost as the interfaces are renewed. Using amphiphilic graft copolymers can significantly suppress this loss and keep the hydrophilicity of the membrane stable during long-term operation.

[0039] It should be noted that in this application, the hydrophilic modified component is distributed within the separation functional layer 141 and the porous support layer 142 through bulk blending, and is at least distributed on the pore wall surface of the separation functional layer 141, rather than being merely attached to the outer surface of the separation functional layer 141 as a surface coating layer. In the example of this application, bulk blending is achieved as follows: the hydrophilic modified component, polyvinylidene fluoride resin, and pore-forming agent are dissolved together in a solvent to prepare a casting solution, in which the hydrophilic modified component is dispersed at the molecular level; in the subsequent phase separation molding process, the casting solution is immersed in a coagulation bath mainly composed of water, the solvent and non-solvent exchange occurs, the polymer solidifies into a film and forms a through-pore structure. During this process, hydrophilic segments spontaneously migrate and accumulate at the interface in contact with the aqueous phase under thermodynamic drive; this phenomenon is called surface segregation. Since the aqueous phase not only contacts the outer surface of the membrane but also enters the interior of the membrane through the pores, the enrichment of hydrophilic segments occurs simultaneously on the outer surface of the separation functional layer 141 and the surface of its internal pore walls. As a result, the concentration of hydrophilic components in the separation functional layer 141 is distributed in a gradient along the thickness direction, with the content at the outer surface being higher than that at the interior, rather than being uniformly distributed.

[0040] However, the hydrophilic durability of this application does not depend on the deep reserves in the thickness direction. The mechanism is that the separation functional layer 141 has a porous structure, and the surface area of ​​its internal pore walls is much larger than the external geometric surface area, and the pore walls of each layer have been hydrophilized. When the cleaning part 32 scrapes off the outer surface of the separation functional layer 141, only the surface material is scraped off, and a new batch of new, equally hydrophilized pore walls are simultaneously exposed in the newly exposed membrane surface, so that the newly exposed membrane surface still maintains good wettability. In other words, this application relies on the structural feature of "each layer has pores and each pore wall is hydrophilic", rather than on the reserves of hydrophilic agent under the surface layer, so it can maintain hydrophilicity continuously during the process of scraping off the separation functional layer 141 layer by layer. In contrast, if the hydrophilic modification is limited to the outer surface of the membrane, no matter how firmly it is bonded to the substrate, once the surface layer is scraped off, the newly exposed membrane surface is the unmodified polyvinylidene fluoride body, and its water contact angle will quickly rise, and the hydrophilicity and antifouling performance will be lost.

[0041] The membrane filter cartridge 14 of this embodiment is prepared according to the following steps: S1. Preparation of casting solution: Polyvinylidene fluoride resin, hydrophilic modification component and porogen are dissolved together in solvent, stirred at 60℃ to 90℃ for 8 h to 24 h, and allowed to stand for vacuum degassing for 12 h to 24 h to obtain casting solution; based on 100 parts by weight of polyvinylidene fluoride resin, the amount of solvent is 300 to 500 parts by weight, and the amount of porogen is 2 to 10 parts by weight; the solvent can be selected from one or more of N-methylpyrrolidone, dimethylacetamide, triethyl phosphate and N,N-dimethylformamide, and the porogen can be selected from one or more of polyethylene glycol 400, polyethylene glycol 2000, polyvinylpyrrolidone K17 and lithium chloride.

[0042] S2. Pretreatment of the reinforcement skeleton layer: The fiber braided tube is treated with a sodium hydroxide solution of 5% to 10% by mass at 60°C to 80°C for 30 to 60 minutes, or subjected to atmospheric pressure plasma or corona treatment, washed with water and dried to improve the interfacial bonding force between the skeleton layer and the casting solution.

[0043] S3. Co-extrusion coating: Using the fiber braided tube processed in step S2 as the core material, the porous support layer casting liquid and the separation functional layer casting liquid obtained in step S1 are respectively fed into a double-layer co-extrusion die, so that the separation functional layer casting liquid covers the outer side and the porous support layer casting liquid is located on the inner side, and are simultaneously coated on the outer surface of the fiber braided tube. The total coating thickness is 0.3 mm to 1.5 mm, of which the coating thickness of the separation functional layer is 0.02 mm to 0.15 mm. In the separation functional layer casting liquid, based on 100 parts by weight of polyvinylidene fluoride resin, the amount of pore-forming agent is 1.2 to 2 times that of the porous support layer casting liquid, and the amount of hydrophilic modification component is higher than that of the porous support layer casting liquid.

[0044] It should be noted that the separation functional layer 141 described in this invention is not the ultrathin, dense skin layer with a thickness of submicron in conventional asymmetric membranes, but rather a porous separation layer with a thickness of tens to hundreds of micrometers, belonging to the category of microfiltration / ultrafiltration. Its average pore size is 0.05 μm to 1.0 μm, and it achieves retention through a combination of pore size sieving and pore wall hydrophilicity. Because it is a thick porous layer, it can retain an intact separation structure even after the surface layer is successively scraped off by the cleaning section 32. The cumulative amount of scraping along the thickness direction of this layer can withstand is 30% to 50% of its original thickness; after this amount is exceeded, the membrane filter cartridge 14 should be replaced.

[0045] S4. Phase Separation Molding: The coated tubular body is immersed in a coagulation bath for non-solvent-induced phase separation, allowing the casting solution to solidify into a film and form a through-pore structure. Simultaneously, hydrophilic segments are segregated and enriched onto the pore wall surface. The coagulation bath is deionized water or a mixture of water and solvent at a volume ratio of 1:0 to 3:1, at a temperature of 20℃ to 60℃, and a residence time of 5 min to 30 min. Due to the higher amount of pore-forming agent and higher content of hydrophilic modified components in the casting solution for the separation functional layer, it forms an outer layer with smaller pore size and higher enrichment of hydrophilic components on the pore walls after molding. The porous support layer forms an inner layer with a porosity of 70% to 85%. The two layers interpenetrate and bond together at the interface during the same phase separation process.

[0046] S5. Rinsing and Pore Preservation: Rinse with deionized water for 24 to 48 hours to remove residual solvent and pore-forming agent; then soak in a 20% to 40% (w / w) aqueous glycerol solution or ethanol gradient displacement solution for 2 to 8 hours, followed by air drying to prevent pore structure collapse during drying. As a preferred example of the present invention, a heat treatment annealing step can be added after step S5: treatment at 80°C to 120°C for 0.5 to 4 hours to improve the crystallinity and wear resistance of the film.

[0047] To verify the hydrophilic durability of the separation functional layer 141 after it has been scraped layer by layer, this application employs a layer-by-layer scraping test: material is removed layer by layer from the outer surface of the membrane filter cartridge 14 using sandpaper or precision machining, removing 10 μm, 30 μm, and 50% of the original thickness of the separation functional layer 141, respectively. The water contact angle of the newly exposed surface is measured using the seated drop method after each layer is removed, under the conditions of 3 μL deionized water and 25°C. In the example of this application, the initial water contact angle of the outer surface of the membrane filter cartridge 14 is no greater than 60°. After scraping down to 50% of the original thickness of the separation functional layer 141, the water contact angle of the newly exposed surface is still no greater than 60°, proving that the hydrophilic components are indeed distributed inside the membrane and on the pore wall surface, rather than only adhering to the outer surface. As a control, a membrane filter cartridge with a polyvinyl alcohol coating had an initial water contact angle of 20°, but after scraping off 10 μm, the water contact angle of the newly exposed surface rose to over 70°. A membrane filter cartridge with only chemical grafting modification on the outer surface also had a low initial water contact angle, but after scraping off 10 μm, it also rose to over 80°. These comparisons demonstrate that under scraping conditions, surface hydrophilic modification alone—whether physical coating or chemical bonding—cannot maintain persistent hydrophilicity; the hydrophilic component must be distributed both inside the membrane and on the pore wall surface to achieve this.

[0048] It should be noted that the layer structure, formulation, preparation method and performance values ​​of the membrane filter cartridge 14 described above are only examples of what can be achieved in this application. Any polyvinylidene fluoride composite membrane that can make the separation functional layer 141 still hydrophilic after being scraped by the cleaning part 32 can be used in this device.

[0049] In the example of this application, the top of all the first guide plates 26 and the second guide plates 27 are respectively fixedly connected to the upper central box 4, and the bottom of all the lower central box 41 are respectively fixedly connected to the lower central box 41. The bottom of the upper central box 4, the top and bottom of the lower central box 41 are all provided with second through holes 42, which can guide and discharge clean water under the sealing condition.

[0050] As a preferred example of the present invention, when the device performs the sealing and cleaning operation, the cleaning water can be evenly distributed through the through holes of the collection box to form a stable circulating water flow inside and outside the membrane filter cartridge 14, so that the water flow is more uniform and the cleaning is more thorough; at the same time, the impurities scraped off by the guide plate will be uniformly collected and stored by the lower collection box 41, effectively preventing impurities from adhering to the surface of the membrane filter cartridge 14 again. Finally, the collected impurities can be discharged with the water flow, which greatly improves the self-cleaning effect.

[0051] In the example of this application, the self-cleaning component includes a fifth groove 43, which is located at the top of the upper collection box 4. A through-hole support hole 57 is provided at the top of the upper collection box 4. A support rod 58 is slidably connected within the support hole 57. A sealing plate 45 is fixedly connected to the top of the support rod 58, corresponding to the fifth groove 43. A guide vane 44 is fixedly connected to one end of the sealing plate 45. The guide vane 44 is spiral-shaped. A lifting rod 46 is fixedly connected to the top of the guide vane 44. The lifting rod 46 is L-shaped. A threaded rod 47 is rotatably connected to the other end of the lifting rod 46. A threaded cylinder 48 is threadedly connected to the other end of the threaded rod 47. The threaded cylinder 48 is rotatably installed at the bottom of the top cover 11. A first toothed ring 49 is fixedly connected to the outer periphery of the threaded cylinder 48, and a second toothed ring 52 is fixedly connected to the bottom end of the outer cylinder 13. The second toothed ring 52 meshes with the first toothed ring 49. When the handle 51 is turned to drive the lever 5 to rotate, the threaded cylinder 48 can be driven to rotate synchronously, thereby driving the threaded rod 47, lifting rod 46, guide vane 44 and sealing plate 45 to lift upward, so that the sealing plate 45 is disengaged from the fifth groove 43. Clean water can be introduced into the space between the inner cylinder 12 and the membrane filter cartridge 14 through the open channel, and the spiral guide vane 44 can accelerate the water circulation and improve the cleaning efficiency.

[0052] As a preferred example of the present invention, when the equipment switches operating conditions, the outer cylinder 13 rotates, driving the second toothed ring 52 to mesh with and drive the first toothed ring 49, which in turn drives the threaded cylinder 48 to rotate. Through the linkage of the threaded rod 47 and the lifting rod 46, the sealing plate 45 and the guide vane 44 are controlled to rise and fall. In the filtration condition, the sealing plate 45 presses and seals the fifth groove 43 at the top of the upper collection box 4, sealing the top channel of the membrane filter cartridge 14, completely preventing sewage from overflowing, and ensuring the sealing of the filtration condition. In the sealing and cleaning condition, the sealing plate 45 automatically rises, opening the top water passage, and the clean water is smoothly introduced into the inner and outer cavities of the membrane filter cartridge 14. At the same time, the spiral guide vane 44 moves with the water flow, actively disturbing the water flow, accelerating the water flow circulation, increasing the water flow scouring speed and scouring range, quickly cleaning the impurities scraped off the filter screen surface, and efficiently completing the self-cleaning operation.

[0053] In the example of this application, the top of the connecting cover 24 is connected to the first tube 15, the other end of the first tube 15 penetrates the outer shell 1, and the connecting cover 24 is provided with an anti-collision groove 25. The first tube 15 is used to introduce cleaning water, and the anti-collision groove 25 is used to avoid motion interference between the threaded cylinder 48 and the cover.

[0054] As a preferred example of the present invention, during cleaning operations, external cleaning water is stably and continuously introduced into the equipment through the first pipe 15. The anti-collision groove 25 opened on the connecting cover 24 can reserve space for the movement of all moving parts such as the threaded cylinder 48, the cover, and the lifting rod 46. When the equipment switches working conditions or the parts reciprocate, the collision, friction, and jamming problems between parts can be completely avoided, preventing wear and deformation of parts, reducing the probability of failure, and extending the service life of the equipment.

[0055] In the example of this application, the top of the outer shell 1 is connected to a second pipe 16, the water outlet height of the second pipe 16 is less than the horizontal height of the top of the connecting cover 24, the bottom of the outer shell 1 is funnel-shaped, a sealing ring 64 is fixedly installed on the bottom of the inner wall of the outer shell 1, the sealing ring 64 is correspondingly located at the upper end of the funnel section of the outer shell 1, and a sealing strip is fixedly installed on the inner wall of the sealing ring 64, and the sealing strip abuts against the bottom of the outer cover 2. A slag discharge pipe 18 is sleeved on the outer side of the bottom of the inner cylinder 12, and the space between the slag discharge pipe 18 and the inner cavity of the device is used to discharge clean water and scraped impurities. The funnel structure at the bottom of the outer shell 1 can collect fluid and impurities for unified discharge.

[0056] As a preferred example of the present invention, the top second pipe 16 adopts a low-position water outlet design, which can effectively prevent the sewage introduced by the second pipe 16 from entering the inner cover 22 from the top of the connecting cover 24; the bottom of the outer shell 1 adopts a trumpet-shaped converging structure, which has a good gathering and guiding effect, and can quickly collect the clean water and scraped impurities to the bottom of the equipment; the sealing ring 64 inside the outer shell 1 is tightly attached to the bottom of the outer cover 2 to achieve cavity sealing and isolation, preventing water flow from shifting or leaking, so that the sewage introduced by the second pipe 16 is concentrated and introduced to the outside of the membrane filter cartridge 14 for membrane filtration; in conjunction with the slag discharge pipe 18 on the outside of the inner cylinder 12, the collected impurities and clean water can be quickly and thoroughly discharged from the equipment.

[0057] Example 2, refer to Figures 13 to 16This is the second embodiment of the present invention. Unlike the previous embodiment, this embodiment provides a safety alarm function for the membrane filtration device. It includes a safety alarm mechanism comprising a transparent cover 7, which is fixedly installed on the top of the outer casing 1. The inner cavity of the transparent cover 7 is connected to the inner cavity of the outer casing 1. A top head 71 is slidably connected inside the transparent cover 7. The top cross-section of the top head 71 is an isosceles trapezoid. A connecting rod 72 is fixedly connected to one end of the top head 71 facing the top cover 11, and a float 73 is fixedly connected to the other end of the connecting rod 72. The float 73 is disposed inside the outer casing 1. A through-type mounting groove 74 is provided at the top. A push arm 75 is rotatably mounted in the mounting groove 74 via a bearing. The push arm 75 is L-shaped. An alarm box 76 is provided on the outside of the mounting groove 74. The alarm box 76 is fixedly mounted on the top of the transparent cover 7. An alarm 77 is fixedly mounted on the bottom of the alarm box 76. The end of the push arm 75 facing the alarm 77 corresponds to the switch of the alarm 77. A second spring 78 is fixedly mounted on the end of the push arm 75 facing the alarm 77. The other end of the second spring 78 is fixedly connected to the side wall of the alarm box 76. A cover is detachably mounted on the top of the alarm box 76.

[0058] As a preferred example of the present invention, when the equipment is running normally, the internal water level is stable, the float 73 is in a low position, and the alarm structure is in an untriggered state. When the membrane filter cartridge 14 is blocked, the water flow is abnormal, or the cavity is overloaded, the internal water level of the equipment will rise abnormally, causing the float 73 to float up. The connecting rod 72 pushes the top head 71, squeezing the L-shaped push arm 75 to touch the alarm switch 77, triggering an audible and visual alarm, and promptly reminding staff to check and repair. At the same time, the equipment switches between blocking and cleaning modes, and starts the self-cleaning program to automatically clean up blockages and impurities. The second spring 78 of the alarm mechanism can realize the quick reset of the push arm 75, ensuring that the mechanism can be repeatedly triggered. The transparent cover 7 allows for a direct observation of the internal linkage status, and the removable cover facilitates the later maintenance and replacement of alarm parts.

[0059] The embodiments of this application have been described above with reference to the accompanying drawings. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. This application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A scratch-resistant polyvinylidene fluoride composite film, characterized in that, The composite membrane is cylindrical and includes a separation functional layer (141), a porous support layer (142), and a reinforcing skeleton layer (143) arranged sequentially from the outside to the inside. The separation functional layer (141) forms the outer wall surface of the composite membrane, which is used to contact and cooperate with the scraping component and withstand its scraping. It also includes a hydrophilic modification component, which is distributed in the interior of the separation functional layer (141) and the porous support layer (142) in a bulk blending manner, and is at least distributed on the pore wall surface of the separation functional layer (141), rather than being attached only to the outer surface of the separation functional layer (141) in the form of a surface coating layer, so that the newly exposed film surface and newly exposed pore walls after the separation functional layer (141) is scraped off layer by layer by the scraping component are still hydrophilic.

2. A membrane filtration device with a safety alarm function, characterized in that... ,include: The outer casing (1) is provided with a filter sealing mechanism inside the outer casing (1); The drive assembly is located on the top of the housing (1) and is connected to the filter blocking mechanism for driving the filter blocking mechanism to switch to the filtration mode or the blocking mode. A sealing scraping assembly is installed on the filter clogging mechanism. Under filtration conditions, the sealing scraping assembly seals the filter clogging mechanism. Under clogging conditions, the sealing scraping assembly adheres to the outer wall of the membrane filter cartridge (14) and scrapes and cleans its outer wall when the membrane filter cartridge (14) rotates. The self-cleaning component is disposed on the outside of the membrane filter cartridge (14). Under filtration conditions, the self-cleaning component blocks the top channel of the membrane filter cartridge (14); under blocking conditions, the self-cleaning component can open the top channel of the membrane filter cartridge (14). A safety alarm mechanism is installed inside the housing (1) and its upper end extends through the top of the housing to monitor the operating status of the membrane filter cartridge (14). The membrane filter cartridge (14) is the scratch-resistant polyvinylidene fluoride composite membrane as described in claim 1, and the separation functional layer (141) forms the outer wall surface of the membrane filter cartridge (14) and contacts and cooperates with the cleaning part (32) of the sealing scraping assembly.

3. A membrane filtration device with a safety alarm function according to claim 2, characterized in that, The filter sealing mechanism includes a top cover (11), which is detachably installed on the top of the outer shell (1). An inner cylinder (12) is rotatably arranged in the middle of the outer shell (1). A plurality of first through holes (17) are opened in the middle of the inner cylinder (12). The membrane filter cartridge (14) is sleeved and assembled on the outside of the inner cylinder (12). The membrane filter cartridge (14) is correspondingly arranged with the first through holes (17) on the inner cylinder (12). An inner cover (22) is sleeved on the outside of the membrane filter cartridge (14). A plurality of second grooves (23) are opened on the outer periphery of the inner cover (22). An outer cover (2) is sleeved on the outside of the inner cover (22). A plurality of first grooves (21) are opened on the outer periphery of the outer cover (2). The number of first grooves (21) and second grooves (23) is the same. A through third groove (38) is opened at the bottom of the inner cover (22). A through fourth groove (39) is opened at the bottom of the outer cover (2).

4. A membrane filtration device with a safety alarm function according to claim 3, characterized in that, The top cover (11) is fixedly connected to a bracket (6), and a motor (61) is fixedly installed at the other end of the bracket (6). A gear (62) is fixedly connected to the drive end of the motor (61), and the gear (62) meshes with a third toothed ring (63). The third toothed ring (63) is fixedly installed on the top of the inner cylinder (12).

5. A membrane filtration device with a safety alarm function according to claim 3, characterized in that, The drive assembly includes an outer cylinder (13), which is rotatably mounted on the outer side of the top of the inner cylinder (12), and the bottom end of the outer cylinder (13) penetrates the top cover (11). A connecting cover (24) is fixedly connected to one end of the outer cylinder (13) at the bottom of the top cover (11). The connecting cover (24) is detachably mounted on the top of the outer cylinder (13). A lever (5) is fixedly connected to the top of the outer cylinder (13). A handle (51) is fixedly connected to the other end of the lever (5). A through limiting hole (53) is provided on the lever (5). A limiting rod (54) is inserted into the limiting hole (53). A first spring (55) is sleeved on one end of the limiting rod (54). The two ends of the first spring (55) are fixedly connected to the outer wall of the limiting rod (54) and the corresponding outer wall of the lever (5), respectively. The top cover (11) has two positioning holes (56), which correspond to the ends of the limiting rod (54).

6. A membrane filtration device with a safety alarm function according to claim 5, characterized in that, The sealing scraping assembly includes multiple first guide plates (26) and multiple second guide plates (27). The first guide plates (26) and second guide plates (27) are respectively fixedly disposed on both sides of the second groove (23). The cross-sections of the two corresponding first guide plates (26) and second guide plates (27) are arranged in a figure-eight shape on the outer periphery of the membrane filter cartridge (14). A through movable groove (3) is opened in both the first guide plate (26) and the second guide plate (27). The two ends of the movable groove (3) are respectively corresponding to the outer cover (2) and the membrane filter cartridge (14). A squeezing part (31) is provided at the end of the movable groove (3) near the outer cover (2), and a cleaning part (32) is provided at the end of the movable groove (3) near the membrane filter cartridge (14). The cleaning part (32) is modified with a Shore hardness of 70A to 90A. The flexible polyurethane, the extrusion part (31) is EPDM rubber, the hardness of the cleaning part (32) is lower than the surface hardness of the separation functional layer (141), and a notch (33) is provided on the top of the outer side of each of the first guide plate (26) and the second guide plate (27). A collar (34) is sleeved on the outside of the notch (33). The outer side of the collar (34) is fixedly connected to the inner wall of the outer cover (2). A plurality of equally spaced docking parts (35), guide parts (36) and protrusions (37) are provided on the inner side of the collar (34). The thickness of the docking part (35) relative to the outer side of the collar (34) is less than the thickness of the protrusion (37) relative to the outer side of the collar (34). The thickness of the guide part (36) increases sequentially from the docking part (35) to the protrusion (37).

7. A membrane filtration device with a safety alarm function according to claim 6, characterized in that, All the first guide plates (26) and the second guide plates (27) are respectively fixedly connected to the top of the upper central box (4) and the bottom of the lower central box (41). The bottom of the upper central box (4), the top and the bottom of the lower central box (41) are all provided with a second through hole (42).

8. A membrane filtration device with a safety alarm function according to claim 7, characterized in that, The self-cleaning component includes a fifth groove (43), which is located at the top of the upper collection box (4). A through support hole (57) is provided at the top of the upper collection box (4). A support rod (58) is slidably connected in the support hole (57). A sealing plate (45) is fixedly connected to the top of the support rod (58). The sealing plate (45) corresponds to the fifth groove (43). A guide vane (44) is fixedly connected to one end of the sealing plate (45). The guide vane (44) is spiral in shape. A lifting rod (46) is fixedly connected to the top of the plate (44). The lifting rod (46) is L-shaped. A threaded rod (47) is rotatably connected to the other end of the lifting rod (46). A threaded cylinder (48) is threadedly connected to the other end of the threaded rod (47). The threaded cylinder (48) is rotatably installed at the bottom of the top cover (11). A first toothed ring (49) is fixedly connected to the outer periphery of the threaded cylinder (48). A second toothed ring (52) is fixedly connected to the bottom end of the outer cylinder (13). The second toothed ring (52) meshes with the first toothed ring (49).

9. A membrane filtration device with a safety alarm function according to claim 8, characterized in that, The top of the connecting cover (24) is connected to a first tube (15), and the other end of the first tube (15) penetrates the outer shell (1). The connecting cover (24) is provided with an anti-collision groove (25). The top of the outer shell (1) is connected to a second pipe (16), the water outlet height of the second pipe (16) is less than the horizontal height of the top of the connecting cover (24), the bottom of the outer shell (1) is funnel-shaped, a sealing ring (64) is fixedly installed on the bottom of the inner wall of the outer shell (1), the sealing ring (64) is located at the upper end of the funnel section of the outer shell (1), and the sealing ring (64) abuts against the bottom of the outer cover (2), and a slag discharge pipe (18) is sleeved on the outer side of the bottom of the inner cylinder (12).

10. A membrane filtration device with a safety alarm function according to claim 2, characterized in that, The safety alarm mechanism includes a transparent cover (7), which is fixedly installed on the top of the outer shell (1). The inner cavity of the transparent cover (7) is connected to the inner cavity of the outer shell (1). A top head (71) is slidably connected inside the transparent cover (7). The top cross-section of the top head (71) is an isosceles trapezoid. A connecting rod (72) is fixedly connected to one end of the top head (71) facing the top cover (11). A float plate (73) is fixedly connected to the other end of the connecting rod (72). The float plate (73) is set inside the outer shell (1). A through-type mounting groove (74) is opened on the top of the transparent cover (7). An arm (75) is rotatably installed inside the mounting slot (74). The arm (75) is L-shaped. An alarm box (76) is installed on the outside of the mounting slot (74). The alarm box (76) is fixedly installed on the top of the transparent cover (7). An alarm (77) is fixedly installed on the bottom of the alarm box (76). One end of the arm (75) facing the alarm (77) corresponds to the switch of the alarm (77). A second spring (78) is fixedly installed on one end of the arm (75) facing the alarm (77). The other end of the second spring (78) is fixedly connected to the side wall of the alarm box (76).

Images