A security filter with a foldable filter element and a method for filtering a liquid

Abstract

The application relates to the technical field of water filtering equipment, in particular to a folding filter core safety filter and a liquid filtering method thereof. The folding filter core safety filter comprises a main shell, a top cover arranged at the top of the main shell, and a filter core assembly arranged in the main shell. The filter core assembly comprises an elastic support, a folding filter membrane elastically connected in the elastic support, and a collecting groove communicated in the folding filter membrane and fixedly arranged at the bottom of the elastic support. A pulse assembly is arranged at the top of the filter core assembly. The water flow is impacted on the connecting plate in a pulse type and a non-uniform speed state through the pulse assembly, the folding filter membrane reciprocally vibrates up and down in the elastic support, the continuous self-cleaning in the filtering process is realized, the impurity adhesion amount on the surface of the folding filter membrane is reduced, the filtering resistance is kept low for a long time, the filtering flow and the efficiency are stable, the performance attenuation caused by the blockage is further avoided, and the service life of the filter core assembly is effectively prolonged.

Description

Technical Field

[0001] This invention relates to the field of water filtration equipment technology, and more specifically, to a pleated filter cartridge security filter and its liquid filtration method. Background Technology

[0002] In industrial production and water treatment processes, the cleanliness of fluids directly affects product quality, equipment lifespan, and process efficiency. Early filtration equipment mostly used tubular, bag, or spiral wound filter cartridges, which had problems such as small filtration area, low dirt holding capacity, and frequent replacement. As processes have increased their requirements for filtration accuracy (e.g., 0.1μm, 0.22μm) and efficiency, pleated filter cartridges have become mainstream due to their structural innovation.

[0003] During the use of traditional pleated cartridge security filters, impurities in the wastewater (such as particles, colloids, suspended solids, etc.) gradually adhere to the surface or pores of the pleated filter membrane. The adsorption force (van der Waals force, electrostatic attraction, etc.) and mechanical interception of impurities on the filter membrane surface make it difficult for impurities to fall off naturally. As the filtration time increases, the filter membrane becomes more clogged, resulting in increased filtration resistance, decreased flow rate, and the need for frequent shutdowns to replace the filter cartridge, thus reducing the lifespan of the filter cartridge. Summary of the Invention

[0004] The purpose of this invention is to provide a pleated filter cartridge security filter and its liquid filtration method, so as to solve the problems in the above-mentioned background technology that the filter membrane is easily clogged after the filter cartridge has been used for a long time, the filtration efficiency decays rapidly, and the filter cartridge has a short service life.

[0005] To achieve the above objectives, the present invention first provides a folded filter cartridge security filter, including a main housing, a top cover provided on the top of the main housing, and a filter cartridge assembly provided inside the main housing, wherein: the filter cartridge assembly includes an elastic support member, a folded filter membrane is elastically connected inside the elastic support member, a collection groove is provided inside the folded filter membrane, and the collection groove is fixedly installed at the bottom of the elastic support member;

[0006] The filter element assembly is equipped with a pulse component at the top. The pulse component causes the water flow to impact the connecting plate in a pulsed, non-uniform state, causing the folded filter membrane to vibrate up and down inside the elastic support.

[0007] The beneficial effects of this invention are:

[0008] 1. When filtering wastewater, the pleated filter membrane effectively improves the filtration effect, and the multi-layer pleats of the pleated structure greatly increase the screening area, disperse the interception pressure, and reduce the risk of local blockage.

[0009] 2. When cleaning impurities on the surface of the pleated filter membrane, the pulse component drives the pleated filter membrane to vibrate up and down, causing the impurities attached to the surface of the pleated filter membrane to fall off, thereby cleaning the impurities attached to the surface of the pleated filter membrane and effectively extending the filtration effect of the filter element assembly.

[0010] Based on the above technical solution, the present invention can be further improved as follows.

[0011] Preferably, the elastic support includes a first frame and a second frame. Several elastic elements are fixedly connected in a ring on one side of both the first frame and the second frame. The upper and lower ends of the folded filter membrane are symmetrically engaged with connecting plates. One end of the upper elastic element is fixedly connected to the top of the upper connecting plate, and one end of the lower elastic element is fixedly connected to the bottom of the lower connecting plate.

[0012] The beneficial effect of adopting the above-mentioned further solution is that the upper and lower ends of the folded filter membrane are elastically connected to one side of the first frame and the second frame respectively through the connecting plate and the elastic element, and the folded filter membrane can reciprocate within the first frame and the second frame under the action of elasticity.

[0013] Preferably, a water inlet pipe is fixedly connected to the top of the first frame, and the pulse assembly is disposed inside the water inlet pipe. The pulse assembly includes a rotating shaft, the upper and lower ends of which are respectively rotatably connected to the inside of the upper bracket and the center of the lower fixed plate inside the water inlet pipe. An impeller is fixedly connected to the outside of the rotating shaft, and several blades are fixedly connected to the outside of the impeller in a ring. Several guide pipes are embedded in the fixed plate below the inside of the water inlet pipe in a ring, and the number of guide pipes is the same as the number of blades.

[0014] The beneficial effect of adopting the above-mentioned further scheme is that, through the periodic change of "closed-open", a pulsed water flow is formed at the outlet of the guide pipe, which provides sufficient impact energy for the vibration of the folded filter membrane.

[0015] Preferably, the blades are provided with serrated edges on both sides, and a flow guide is fixedly connected to the bottom of the fixing plate below the inner side of the water inlet pipe.

[0016] The beneficial effects of adopting the above-mentioned further scheme are that the serrated strip further enhances the water flow cutting effect, makes the water flow form turbulence on the blade surface, destroys the laminar boundary layer, improves energy transfer efficiency, and the guide shroud accurately guides the pulsed water flow ejected from the guide pipe to the connection plate edge and the connection area of ​​the folded filter membrane, so that the impact force is concentrated on the support point of the folded filter membrane, improving the vibration effect.

[0017] Preferably, a guide ring is fixedly connected to one side of the connecting plate. The guide ring at the top of the upper connecting plate slides in a limiting groove in one side of the first frame, and the guide ring at the bottom of the lower connecting plate slides in a limiting groove in one side of the second frame. The height of the upper guide ring is greater than the height of the lower guide ring. A sealed cavity is formed between the upper connecting plate, the guide ring, and the inner side of the first frame, and a sealed cavity is formed between the lower connecting plate, the guide ring, and the inner side of the second frame. The elastic element is placed in the sealed cavity.

[0018] The beneficial effect of adopting the above-mentioned further solution is that it will not cause the connection between the structures to separate under various circumstances, effectively blocking the sewage inside the guide ring and the connecting plate, and allowing it to be discharged only through the folded filter membrane. This prevents unfiltered sewage from leaking between the connecting plate and the first frame, increases the sealing of the connection between the structures, and further ensures the filtration effect.

[0019] Preferably, a collection groove is fixedly connected to the bottom of the second frame, and a porous buffer plate is fixedly connected to the upper end of the inner cavity of the collection groove.

[0020] The beneficial effect of adopting the above-mentioned further solution is that the porous buffer plate, through the diversion of the pores and the resistance, allows the water to enter the collection tank in a stable state, so that impurities can settle smoothly under the action of gravity and remain in the collection tank, avoiding backflow to the surface of the pleated filter membrane with the water flow, and further protecting the long-term filtration efficiency of the pleated filter membrane.

[0021] Preferably, the first frame and the second frame are connected by threads, and the bottom of the second frame is fixedly connected with several locking blocks in a ring shape. The locking blocks are engaged with one side of the lower end of the main housing, and the top sealing gasket of the water inlet pipe is in contact with the upper side of the top cover.

[0022] The advantages of adopting the above-mentioned further solutions are that the pleated filter membrane in the frame can be replaced flexibly and quickly, reducing filtration costs, and the filter element assembly is easy and convenient to install and disassemble, improving maintenance efficiency.

[0023] Preferably, a water outlet pipe is fixedly embedded in the lower end of one side of the main housing, and a sewage pipe is fixedly connected to the bottom of the main housing, with the internal channel of the sewage pipe communicating with the inner cavity of the main housing.

[0024] The beneficial effect of adopting the above-mentioned further solution is that the filtered clean liquid is discharged from the outlet pipe until the sewage filtration is completed, the water flow stops entering the filter, the drain valve connected to the drain pipe is opened, and the impurities collected in the collection tank are discharged from the drain pipe.

[0025] Furthermore, a liquid filtration method for a pleated cartridge security filter is provided, comprising the following steps:

[0026] The first step is for the wastewater to be filtered to enter the top of the filter assembly through the central channel of the top cover.

[0027] The second step involves the wastewater entering the top of the filter element assembly experiencing periodic pressure fluctuations under the action of the pulse component.

[0028] The third step involves the water flowing non-uniformly downwards into the filter element assembly under the action of the pulse component. The impact force of the water flow pushes the pleated filter membrane downwards. Since the connecting plates at the upper and lower ends of the pleated filter membrane are elastically connected to the elastic support, it is elastically reset under the action of the elastic support, causing the pleated filter membrane to reciprocate inside the elastic support. The alternating impact force generated by the vibration can break the adsorption force between impurities and the surface of the filter membrane, causing larger particles of impurities to detach from the surface of the pleated filter membrane due to inertia and fall into the collection tank for collection.

[0029] The fourth step is to discharge the wastewater after impact into the cavity surrounded by the pleated filter membrane. When the wastewater flows through the pleated filter membrane into the inner cavity of the main shell, impurities are blocked on the inner surface of the pleated filter membrane, and water molecules pass through the pleated filter membrane and enter the inner cavity of the main shell through the internal flow port of the elastic support.

[0030] Fifth, the clean liquid filtered in the inner cavity of the main housing is discharged from the outlet pipe. After the sewage filtration is completed, the water flow stops entering the filter. Open the drain valve connected to the drain pipe to discharge the impurities in the collection tank from the drain pipe.

[0031] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0032] By reciprocating the vibration of the pleated filter membrane in the filter element assembly under the action of the pulse component, it can continuously "self-clean" during the filtration process, reduce the amount of impurities adhering to the surface of the pleated filter membrane, maintain a low filtration resistance for a long time, ensure stable filtration flow and efficiency, further avoid performance degradation caused by clogging, effectively extend the service life of the filter element assembly, and this method does not require the design of an additional cleaning mechanism, further reducing the production cost of the filter. Attached Figure Description

[0033] Figure 1 This is an isometric structural schematic diagram of one side of the present invention;

[0034] Figure 2 This is a schematic diagram of the internal structure of the main housing of the present invention;

[0035] Figure 3 This is a schematic diagram of the front cross-sectional structure of the present invention;

[0036] Figure 4 This is a schematic diagram of the front cross-sectional structure of the folded filter paper moving downwards according to the present invention;

[0037] Figure 5This is an exploded perspective view of the filter element assembly of the present invention;

[0038] Figure 6 This is a schematic diagram of the first skeleton three-dimensional structure of the present invention;

[0039] Figure 7 This is a schematic diagram of the second skeleton three-dimensional structure of the present invention;

[0040] Figure 8 This is a schematic diagram of the front view of the pulse component structure of the present invention.

[0041] The meanings of the labels in the diagram are as follows:

[0042] 1. Main casing; 11. Top cover; 12. Water outlet pipe; 13. Sewage drain pipe;

[0043] 2. Filter cartridge assembly; 21. First frame; 22. Second frame; 23. Pleated filter membrane; 24. Connecting plate; 25. Guide ring; 26. Elastic element; 27. Inlet pipe; 28. Collection tank; 29. ​​Porous buffer plate; 210. Locking block;

[0044] 3. Pulse assembly; 31. Shaft; 32. Impeller; 33. Blade; 34. Sawtooth rack; 35. Guide tube; 36. Drainage shroud. Detailed Implementation

[0045] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0046] Please see Figures 1-8As shown, this embodiment provides a pleated cartridge security filter, including a main housing 1. The top of the main housing 1 is provided with a top cover 11. Considering that, on the one hand, in the use of existing security filters without a cleaning structure, as the filtration time increases, impurities in the sewage will gradually adhere to the surface or pores of the pleated filter membrane, which is difficult to fall off naturally, resulting in filter membrane blockage, reducing the filtration efficiency of the filter membrane, requiring frequent shutdowns to replace the filter cartridge, and shortening the filter cartridge's service life. On the other hand, security filters with a cleaning structure have a more complex cleaning structure, increasing the production cost of the filter. Therefore, a filter cartridge assembly 2 is provided inside the main housing 1, wherein: the filter cartridge assembly 2 includes an elastic support member, and a pleated filter membrane 23 is elastically connected inside the elastic support member, making the connection of the pleated filter membrane 23 flexible and facilitating the reciprocating vibration of the pleated filter membrane 23. A collection groove 28 is provided inside the pleated filter membrane 23, and the collection groove 28 is fixedly installed at the bottom of the elastic support member. Impurities on the inner surface of the pleated filter membrane 23 are discharged into the collection groove 28 for centralized collection.

[0047] The filter element assembly 2 is equipped with a pulse component 3 at the top. The pulse component 3 causes the water flow to impact the pleated filter membrane 23 in a pulsed and non-uniform state, causing the pleated filter membrane 23 to vibrate up and down inside the elastic support. The vibration causes the impurities attached to the surface of the pleated filter membrane 23 to fall off and be collected in the collection tank 28, thereby cleaning the impurities attached to the surface of the pleated filter membrane 23 and effectively extending the filtration effect of the filter element assembly 2.

[0048] In summary, the improvement of this embodiment lies in:

[0049] like Figures 3-4 As shown, the pulse component 3 forms a periodic pressure fluctuation pulse water flow into the filter element assembly 2. The water flow then impacts the internal structure of the elastic support and, in conjunction with the elastic reset action of other structures, causes the pleated filter membrane 23 connected to the elastic support to vibrate up and down within the elastic support. On one hand, the alternating impact force generated by the vibration breaks the adhesion between impurities and the surface of the pleated filter membrane 23, causing large particles of impurities to detach from the surface of the pleated filter membrane 23 due to inertia, and colloidal impurities are also reduced due to the vibration. On the other hand, the up and down vibration of the pleated filter membrane 23 drives the surrounding filtrate to form local turbulence, enhancing the flushing effect of sewage on the surface of the pleated filter membrane 23, assisting in the removal of fine impurities, and effectively reducing the clogging of the pleated filter membrane 23. Compared with traditional filters, the filter element assembly 2 has a longer cleaning cycle, a lower replacement frequency, and a significantly longer service life.

[0050] Meanwhile, the reciprocating vibration of the pleated filter membrane 23 continuously "self-cleans" during the filtration process, reducing the amount of impurities adhering to the surface of the pleated filter membrane 23, maintaining a low filtration resistance for a long time, ensuring stable filtration flow and efficiency, further avoiding performance degradation caused by clogging, and this method does not require additional cleaning mechanisms, further reducing the production cost of the filter.

[0051] Based on the above, other structures also need to be disclosed in detail, such as:

[0052] In order to effectively realize the up-and-down reciprocating vibration of the pleated filter membrane 23 inside the elastic support, it is necessary to disclose the specific connection structure between the pleated filter membrane 23 and the elastic support. Therefore, as shown below... Figure 3 , Figure 4 As shown, the elastic support includes a first frame 21 and a second frame 22. Several elastic elements 26 are fixedly connected in a ring on one side of the interior of both the first frame 21 and the second frame 22. The upper and lower ends of the folded filter membrane 23 are symmetrically engaged with connecting plates 24. One end of the upper elastic element 26 is fixedly connected to the top of the upper connecting plate 24, and one end of the lower elastic element 26 is fixedly connected to the bottom of the lower connecting plate 24. This allows the upper and lower ends of the folded filter membrane 23 to be elastically connected to one side of the interior of the first frame 21 and the second frame 22 respectively through the connecting plates 24 and the elastic elements 26. Under the action of elasticity, the folded filter membrane 23 can reciprocate within the first frame 21 and the second frame 22.

[0053] In order to effectively achieve the goal of forming a periodic pressure fluctuation pulsed water flow through the pulse component 3, a non-uniform impact is generated on the connecting plate 24, causing the pleated filter membrane 23 to vibrate. Therefore, as Figure 8 As shown, a water inlet pipe 27 is fixedly connected to the top of the first frame 21. The pulse assembly 3 is disposed inside the water inlet pipe 27. The pulse assembly 3 includes a rotating shaft 31. The upper and lower ends of the rotating shaft 31 are respectively rotatably connected to the inside of the upper bracket and the center of the lower fixed plate inside the water inlet pipe 27. An impeller 32 is fixedly connected to the outside of the rotating shaft 31. Several blades 33 are fixedly connected to the outside of the impeller 32 in a ring. Several guide pipes 35 are embedded in the fixed plate inside the lower part of the water inlet pipe 27 in a ring. The number of guide pipes 35 is the same as the number of blades 33.

[0054] The blades 33 feature an arc-shaped design. When water flows axially from the shaft 31 and impacts the blades 33, the structural design of the blades 33 generates an uneven radial force difference. This force difference causes the impeller 32 to acquire torque and rotate at high speed, achieving an efficient conversion from water kinetic energy to mechanical energy. As the impeller 32 rotates, the blades 33 alternately block and open the guide pipe 35. When the blades 33 completely cover the guide pipe 35, the cross-sectional area of ​​the water flow channel decreases sharply, and the pressure inside the pipe increases instantaneously. When the blades 33 leave the guide pipe 35, the water flow channel is completely unobstructed, and the pressure quickly returns to the inlet pressure level. This periodic "closed-open" change creates a pulsed water flow with a pressure fluctuation amplitude of 0.05-0.1 MPa at the outlet of the guide pipe 35, providing sufficient impact energy for the vibration of the pleated filter membrane 23. By adjusting the number of blades 33 and the rotational speed of the impeller 32 (which can be adjusted by the inlet flow rate), the pulse frequency (frequency = impeller rotational speed × number of blades / 60) can be precisely controlled. This frequency range is highly matched with the natural frequency of the pleated filter membrane 23, which easily excites the resonance effect and increases the vibration amplitude of the pleated filter membrane 23.

[0055] In order to effectively enhance the impact effect of water flow on the pleated filter membrane 23 and the connecting plate 24, therefore, as Figure 8 As shown, serrated strips 34 are provided on both sides of the blade 33. The serrated strips 34 further enhance the water flow cutting effect, causing the water flow to form turbulence on the surface of the blade 33, destroying the laminar boundary layer and improving energy transfer efficiency. A flow guide hood 36 is fixedly connected to the bottom of the fixing plate below the inner side of the water inlet pipe 27. The flow guide hood 36 accurately guides the pulse water flow sprayed from the guide pipe 35 to the connection area between the edge of the connecting plate 24 and the folded filter membrane 23, so that the impact force is concentrated on the support point of the folded filter membrane 23, improving the vibration effect.

[0056] Considering that the distance between one side of the two connecting plates 24 and one side of the first frame 21 and the second frame 22 changes when the pleated filter membrane 23 and the connecting plate 24 move up and down, in order to avoid sewage leakage from the connection between the connecting plate 24 and the frame, and to improve the accuracy of the up and down movement of the pleated filter membrane 23 and the connecting plate 24, therefore, Figure 3 , Figure 4 As shown, a guide ring 25 is fixedly connected to one side of the connecting plate 24. The guide ring 25 at the top of the upper connecting plate 24 slides in a limiting groove in one side of the first frame 21, and the guide ring 25 at the bottom of the lower connecting plate 24 slides in a limiting groove in one side of the second frame 22. The height of the upper guide ring 25 is greater than the height of the lower guide ring 25.

[0057] When the pleated filter membrane 23 and the connecting plate 24 vibrate up and down, the guide ring 25 slides within the skeleton limiting groove, restricting the radial displacement of the pleated filter membrane 23 and the connecting plate 24, effectively ensuring the stability of the pleated filter membrane 23 and the connecting plate 24 during vibration, and avoiding displacement or jamming. Meanwhile, on the other hand, such as Figure 3As shown, when the pleated filter membrane 23 and the connecting plate 24 move to the uppermost position, the lower guide ring 25 remains in the limiting groove on one side inside the second frame 22; on the other hand, as... Figure 4 As shown, when the pleated filter membrane 23 and the connecting plate 24 move to the lowest point, the upper guide ring 25 remains in the limiting groove on one side inside the first frame 21. This prevents separation of the structural connections under various circumstances, effectively blocking wastewater inside the guide ring 25 and the connecting plate 24. Wastewater can only pass through the pleated filter membrane 23 and be discharged, preventing unfiltered wastewater from leaking between the connecting plate 24 and the first frame 21 and being discharged into the inner cavity of the main housing 1. This increases the sealing of the structural connections and further ensures the filtration effect.

[0058] Furthermore, a sealed cavity is formed between the upper connecting plate 24, the guide ring 25, and the inner side of the first frame 21, and a sealed cavity is formed between the lower connecting plate 24, the guide ring 25, and the inner side of the second frame 22. The elastic element 26 is placed in the sealed cavity, thereby achieving the sealing of the elastic element 26. The elastic element 26 can be made of materials such as springs, elastic connecting pieces, and elastic silicone strips. By sealing the elastic element 26, the contact between the elastic element 26 and the water source is effectively reduced, preventing water from corroding the elastic element 26 and further improving the service life of the elastic element 26.

[0059] Considering that in traditional filters, detached impurities may be splashed by the water flow and re-adhere to the surface of the pleated filter membrane 23, making effective collection and discharge impossible and posing a risk of secondary contamination of the filter element, therefore, if Figure 3 , Figure 4 , Figure 7 As shown, a porous buffer plate 29 is fixedly connected to the upper end of the inner cavity of the collection tank 28;

[0060] The collection tank 28 directly receives impurities that detach from the filter paper surface due to filter element vibration. The porous buffer plate 29 is located at the upper end of the inner cavity of the collection tank 28, between the pleated filter membrane 23 and the collection tank 28. The through holes in the porous buffer plate 29 do not affect the flow of impurities. When sewage flows downward inside the pleated filter membrane 23, the water flow will first pass through the porous structure of the porous buffer plate 29, and the flow velocity is dispersed and reduced, reducing the scouring and disturbance of the high-speed water flow on the already settled impurities in the collection tank 28. Without the porous buffer plate 29, the water flow directly impacting the bottom of the collection tank 28 may cause the already deposited impurities to be rolled up and splashed again. However, the porous buffer plate 29, through the diversion of the pores and the resistance effect, allows the water flow to enter the collection tank 28 in a stable state, so that the impurities settle smoothly under the action of gravity and are retained in the collection tank 28, preventing them from flowing back to the surface of the pleated filter membrane 23 with the water flow, and further protecting the long-term filtration efficiency of the pleated filter membrane 23.

[0061] To facilitate subsequent replacement of the pleated filter membrane 23 and avoid replacing the entire filter element assembly 2, thus reducing filtration costs, the first frame 21 and the second frame 22 are connected by threads. The pleated filter membrane 23 is the core filtration element of the filter and also the most easily worn component. The threaded connection between the first frame 21 and the second frame 22 allows for rotational separation of the upper and lower frames of the filter element assembly 2, directly exposing the internal pleated filter membrane 23 and connecting plate 24, etc. This eliminates the need to disassemble the entire filter element assembly 2 or damage the structure, allowing for the individual removal and replacement of the old leaf blade 33 with a new one. Compared to the traditional design where the filter element assembly 2 is entirely encapsulated and cannot be disassembled, this structure avoids the waste of replacing the entire filter element assembly 2 due to wear and tear of the pleated filter membrane 23, significantly reducing consumable costs. Furthermore, it is simple and convenient to operate, improving maintenance efficiency.

[0062] The bottom of the second frame 22 is fixedly connected with several locking blocks 210 in a ring shape. The locking blocks 210 are engaged with one side of the lower end of the main housing 1. The replaced filter element assembly 2 is engaged with one side of the main housing 1 through the bottom locking blocks 210. After the top cover 11 is connected to the main housing 1, the top sealing gasket of the water inlet pipe 27 contacts the upper side of the inside of the top cover 11, which improves the overall sealing between the main housing 1 and the filter element assembly 2. At the same time, this method can quickly determine the installation position of the filter element assembly 2 and improve the efficiency of disassembly and assembly of the filter element assembly 2.

[0063] To further ensure the integrity of the filter structure, therefore... Figure 1 , Figure 2 As shown, a water outlet pipe 12 is fixedly embedded in the lower end of one side of the main housing 1, and a sewage pipe 13 is fixedly connected to the bottom of the main housing 1. The internal channel of the sewage pipe 13 is connected to the inner cavity of the main housing 1. The filtered clean liquid is discharged from the water outlet pipe 12 until the sewage filtration is completed and the water flow stops entering the filter. The sewage valve connected to the sewage pipe 13 is opened to discharge the impurities collected in the collection tank 28 from the sewage pipe 13.

[0064] Based on the above embodiments, a liquid filtration method for a pleated filter cartridge security filter is also provided, the specific steps of which are as follows:

[0065] In the first step, the wastewater to be filtered enters the inlet pipe 27 at the top of the filter element assembly 2 through the flow channel in the top cover 11. At this time, the incoming water flows from the inlet pipe 27 and the rotating shaft 31 in the axial direction, impacting the blades 33 on the outside of the impeller 32. Due to the eccentric design of the blades 33, there is a radial component difference in the impact force of the water flow on the blades 33, which drives the impeller 32 and the blades 33 to rotate around the rotating shaft 31. When the impeller 32 rotates, the eccentric blades 33 alternately block and open the guide pipe 35 on the fixed plate below the inner side of the inlet pipe 27. When the blades 33 are facing the guide pipe 35, the water flow is partially blocked (pressure increases); when the blades 33 leave the guide pipe 35, the water flow can pass through completely (pressure decreases), forming a periodic pressure fluctuation.

[0066] In the second step, the water flows non-uniformly downwards from the guide pipe 35 into the filter element assembly 2. During this process, the water flow is guided towards the top of the connecting plate 24 by the guide hood 36. The guide hood 36 increases the impact force of the water flow on the connecting plate 24. Then, the impact force of the water flow pushes the connecting plate 24 and the pleated filter membrane 23 downwards. Since the connecting plates 24 at the upper and lower ends of the pleated filter membrane 23 are in contact with the first frame 21 and the second frame 22 respectively through the elastic element 26, they are elastically reset under the action of the elastic element 26. Through the pulse impact of the water flow on the connecting plate 24 and the elastic action of the elastic element 26, the pleated filter membrane 23 forms a reciprocating vibration inside the first frame 21 and the second frame 22. The alternating impact force generated by the vibration can break the adsorption force between impurities and the filter membrane surface, causing larger particle impurities to detach from the surface of the pleated filter membrane 23 due to inertia. This achieves the cleaning of impurities attached to the surface of the pleated filter membrane 23, effectively maintaining the filtration effect of the pleated filter membrane 23 and extending the service life of the pleated filter membrane 23.

[0067] In the third step, the wastewater after impacting the connecting plate 24 is discharged from the central through hole of the connecting plate 24 into the cavity surrounded by the folded filter membrane 23. When the wastewater flows through the folded filter membrane 23 and is discharged into the inner cavity of the main housing 1, impurities with a particle size larger than the micropores in the folded filter membrane 23 are blocked on the inner surface of the folded filter membrane 23. For colloidal particles with a particle size smaller than the micropores of the folded filter membrane 23 (such as humic colloids and colloidal silica in wastewater), the surface charge or polarity of the folded filter membrane 23 material will adsorb them on the surface or the inner wall of the pores through van der Waals forces and electrostatic attraction. Water molecules pass through the folded filter membrane 23 and enter the inner cavity of the main housing 1 through the internal flow ports of the first skeleton 21 and the second skeleton 22.

[0068] In the fourth step, the clean liquid filtered in the inner cavity of the main housing 1 is discharged from the outlet pipe 12. The impurities on the inner surface of the pleated filter membrane 23 are detached from the surface of the pleated filter membrane 23 due to inertia under the vibration of the subsequent pleated filter membrane 23, and fall naturally into the collection tank 28 below for collection until the sewage filtration is completed, the water flow stops entering the filter, the drain valve connected to the drain pipe 13 is opened, and the impurities in the collection tank 28 are discharged from the drain pipe 13.

[0069] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A pleated cartridge security filter, comprising a main housing (1), wherein a top cover (11) is provided on the top of the main housing (1), characterized in that, The main housing (1) is provided with a filter element assembly (2), wherein: the filter element assembly (2) includes; An elastic support member is provided, and a pleated filter membrane (23) is elastically connected inside the elastic support member. A collection groove (28) is provided inside the pleated filter membrane (23), and the collection groove (28) is fixedly installed at the bottom of the elastic support member. The filter element assembly (2) is provided with a pulse assembly (3) at the top. The pulse assembly (3) causes the water flow to impact the connecting plate (24) in a pulsed, non-uniform state, so that the folded filter membrane (23) vibrates up and down inside the elastic support. The elastic support includes a first frame (21) and a second frame (22). Both the first frame (21) and the second frame (22) have several elastic elements (26) fixedly connected in a ring on one side. The folded filter membrane (23) is symmetrically connected to the upper and lower ends with connecting plates (24). One end of the upper elastic element (26) is fixedly connected to the top of the upper connecting plate (24), and one end of the lower elastic element (26) is fixedly connected to the bottom of the lower connecting plate (24). The first frame (21) is fixedly connected to the top of the water inlet pipe (27). The pulse assembly (3) is set inside the water inlet pipe (27). The pulse assembly (3) includes a rotating shaft (31). The upper and lower ends of the rotating shaft (31) are respectively rotatably connected to the inside of the upper bracket and the center of the lower fixing plate inside the water inlet pipe (27). An impeller (32) is fixedly connected to the outside of the rotating shaft (31). Several blades (33) are fixedly connected to the outside of the impeller (32) in a ring. Several guide pipes (35) are embedded in the fixed plate inside the lower side of the water inlet pipe (27) in a ring. The number of guide pipes (35) is the same as the number of blades (33). The blade (33) has serrated edges (34) on both sides, and a flow guide (36) is fixedly connected to the bottom of the fixing plate below the inner side of the water inlet pipe (27).

2. The pleated filter cartridge security filter according to claim 1, characterized in that, A guide ring (25) is fixedly connected to one side of the connecting plate (24). The guide ring (25) at the top of the upper connecting plate (24) slides in the limiting groove in the inner side of the first frame (21), and the guide ring (25) at the bottom of the lower connecting plate (24) slides in the limiting groove in the inner side of the second frame (22). The height of the upper guide ring (25) is greater than the height of the lower guide ring (25).

3. The pleated filter cartridge security filter according to claim 2, characterized in that, A sealed cavity is formed between the upper connecting plate (24), the guide ring (25) and the inner side of the first skeleton (21), and a sealed cavity is formed between the lower connecting plate (24), the guide ring (25) and the inner side of the second skeleton (22), and the elastic element (26) is placed in the sealed cavity.

4. The pleated filter cartridge security filter according to claim 1, characterized in that, A porous buffer plate (29) is fixedly connected to the upper end of the inner cavity of the collection tank (28).

5. The pleated filter cartridge security filter according to claim 1, characterized in that, The first frame (21) and the second frame (22) are connected by threads. The bottom of the second frame (22) is fixedly connected with several locking blocks (210) in a ring shape. The locking blocks (210) are engaged and connected to one side of the lower end of the main housing (1). The top sealing gasket of the water inlet pipe (27) is in contact with the upper side of the top cover (11).

6. The pleated filter cartridge security filter according to claim 1, characterized in that, A water outlet pipe (12) is fixedly embedded in the lower end of one side of the main housing (1), and a sewage pipe (13) is fixedly connected to the bottom of the main housing (1). The internal channel of the sewage pipe (13) is connected to the inner cavity of the main housing (1).

7. A liquid filtration method for a pleated cartridge security filter, applied to the pleated cartridge security filter according to any one of claims 1-6, characterized in that, Includes the following steps: The first step is for the wastewater to be filtered to enter the top of the filter element assembly (2) through the central channel of the top cover (11); In the second step, the sewage entering the top of the filter element assembly (2) forms periodic pressure fluctuations under the action of the pulse assembly (3); In the third step, under the action of the pulse component (3), the water flow is non-uniformly discharged into the filter element component (2). The impact force of the water flow pushes the pleated filter membrane (23) to move downward. Since the connecting plates (24) at the upper and lower ends of the pleated filter membrane (23) are elastically connected to the elastic support, the elastic support performs elastic reset under the action of the elastic support, so that the pleated filter membrane (23) forms reciprocating vibration inside the elastic support. The alternating impact force generated by the vibration can break the adsorption force between impurities and the filter membrane surface, so that larger particle impurities are removed from the surface of the pleated filter membrane (23) due to inertia and fall into the collection tank (28) for collection. The fourth step is to discharge the wastewater after impact into the cavity surrounded by the pleated filter membrane (23). When the wastewater flows through the pleated filter membrane (23) and is discharged into the inner cavity of the main shell (1), the impurities are blocked on the inner surface of the pleated filter membrane (23), and the water molecules pass through the pleated filter membrane (23) and enter the inner cavity of the main shell (1) through the internal flow port of the elastic support. Fifth step, the clean liquid filtered in the inner cavity of the main shell (1) is discharged from the outlet pipe (12). After the sewage filtration is completed, the water flow stops entering the filter. Open the drain valve connected to the drain pipe (13) to discharge the impurities in the collection tank (28) from the drain pipe (13).

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