Backwashable high-flow cartridge filter element

Abstract

The invention relates to the technical field of sewage purification devices, and discloses a backwashing high-flow cartridge filter element which comprises an outer shell, a filtering mechanism is arranged in the outer shell, the filtering mechanism comprises a water collecting pipe and a plurality of groups of filtering membranes, and the plurality of groups of filtering membranes are spirally wound outside the water collecting pipe. A water production side supporting layer is arranged inside the filtering membrane, a water inlet side supporting layer is arranged outside the filtering membrane, the filtering membrane is of a bag-shaped structure, the water production side supporting layer is clamped between the two layers of membranes, the filtering membrane is welded through the water production side supporting layer, and one ends of the two layers of membranes are welded with the upper side edge and the lower side edge; the filter membrane adopts a spiral roll type structure, so that the filter area is greatly increased, compared with a traditional filter element, the filter area is effectively increased, the filter efficiency is effectively improved when the filter membrane with small-aperture micropores is used, the filter effect can be ensured, the filter efficiency can be improved, and the requirement of large-flow filtration is effectively met; the operation efficiency of the whole filtering system is improved.

Description

Technical Field

[0001] This invention relates to the field of wastewater purification equipment technology, specifically to a backwashable high-flow-rate security filter element. Background Technology

[0002] In industries such as chemical, electronics, and pharmaceutical, liquid filtration is often required to ensure water safety and meet the high water quality requirements of different industries. In the traditional field of liquid filtration, melt-blown filter cartridges and pleated filter cartridges are commonly used.

[0003] Chinese patent CN104984580B discloses a filter element comprising an outer sleeve, an inner sleeve, a stainless steel sealing plate, and a filter screen. The inner sleeve serves as a support frame for the filter screen. The inner sleeve is made of hollow stainless steel round steel, and its corners have a 2.5×45° bevel. A filter screen mounting hole is provided in the middle of the inner sleeve, and the filter screen is fitted onto this hole. The outer sleeve is fitted onto the filter screen and presses it down. The filter screen is a double-layered stainless steel filter screen. By changing the filter screen from a single layer to a double layer, the filtration accuracy of the filter element is improved.

[0004] Although the above invention features a double-layer filter to improve filtration accuracy, the overall contact area between the filter layer and the wastewater is limited, resulting in a smaller wastewater filtration area and reduced filtration efficiency. Furthermore, during the filtration process, contaminants easily accumulate on the outside of the filter layer, causing blockage and reducing the lifespan of the filter element. In addition, to ensure filtration accuracy, the pore size of the inner filter layer is set to be small, and the overall filtration area is limited, further reducing filtration efficiency and making it unsuitable for high-flow-rate filtration needs.

[0005] A filter cartridge backwashing mechanism based on a filter, disclosed in patent publication number CN112546719B, is installed inside a filter housing. It includes a filter cartridge holder and a filter cartridge. The filter housing has a water inlet connector on its side, and an upper and lower water inlet hole communicating with the water inlet connector on its inner wall. A positioning sleeve is provided on the bottom surface of the filter housing, and a water outlet is located inside the positioning sleeve on the bottom surface of the filter housing. Several water inlet grooves are provided on the side of the filter cartridge holder. The lower end of the filter cartridge holder extends to form a connecting sleeve, which is slidably and sealingly connected to the positioning sleeve. The upper end of the filter housing has an end cap with a filter cartridge holder lifting mechanism. A lifting and sealing assembly is located at the lower end of the connecting sleeve. A lower connecting ring is provided on the outer side of the connecting sleeve, which is slidably and sealingly connected to the inner wall of the filter housing. Several backwashing water inlet holes are located below the lower isolation ring on the inner wall of the connecting sleeve. The filter cartridge is backwashed using the pressure of tap water, thereby improving its service life.

[0006] The invention described above cleans impurities on the outer layer of the filter element by backwashing. However, backwashing is performed directly by reverse water flow. Since the reverse flow of water flows out through the micropores of the filter layer, the outflowing water washes the micropores of the filter element. This cleaning method can effectively clean impurities inside the micropores, but it has limited cleaning effect on impurities attached to the surface of the filter element. During the second filtration process, it is very easy for impurities attached to the surface of the filter element to clog the micropores of the filter element again, resulting in poor cleaning effect. Summary of the Invention

[0007] To address the shortcomings of existing technologies, this invention provides a backwashable high-flow-rate security filter element, which has the advantages of high filtration efficiency, good backwashing effect of the filter membrane, and effectively improved filtration efficiency.

[0008] To achieve the above objectives, the present invention provides the following technical solution: A backwashable high-flow-rate security filter cartridge includes an outer shell, inside which a filtration mechanism is provided. The filtration mechanism includes a water collection pipe and several sets of filter membranes. The several sets of filter membranes are spirally wound around the outside of the water collection pipe. Inside the filter membranes, a water production side support layer is provided, and outside the filter membranes, a water inlet side support layer is provided. The filter membranes are configured as a bag-like structure, with a water production side support layer sandwiched between two membranes. The filter membranes are welded through the water production side support layer, and one end and the upper and lower sides of the two membranes are welded together. Water production channels are evenly distributed on the outside of the water collection pipe. The bag-shaped opening of the filter membrane is bonded to the water production channel, and a water inlet side support layer is sandwiched between the two sets of filter membranes. A top cover is fixedly connected to the top of the outer casing. The top cover contains a gas-liquid mixing chamber, which is used to pump gas into the water collection pipe.

[0009] Preferably, the bottom of the outer casing is fixedly connected to a water inlet pipe, the top of the outer casing is fixedly connected to a water outlet pipe, the top of the water inlet pipe is fixedly connected to a water inlet end cap, the water inlet end cap is fixedly connected to the bottom of the outer casing, the top opening of the water outlet pipe is connected to the water collection pipe, and filter element end caps are provided on both the upper and lower sides of the filter mechanism, with the upper and lower filter element end caps abutting against the upper and lower sides of the water inlet side support layer and the filter membrane.

[0010] Preferably, the water production side support layer is configured with a diamond-shaped perforated mesh, the two layers of the filter membrane are welded to both sides of the water inlet side support layer, and the water inlet side support layer is configured with two sets of parallel trapezoidal perforated meshes, which are fitted and movably connected.

[0011] Preferably, the water inlet side support layer includes vertical rods, trapezoidal blocks are fixedly connected to the outside of the vertical rods, and horizontal rods are fixedly connected to the outside of the trapezoidal blocks. A set of vertical rods, trapezoidal blocks, and horizontal rods constitute a set of trapezoidal mesh. The trapezoidal mesh adopts a structure with thicker vertical rods and thinner horizontal rods. The surface of the horizontal rods is polished and rounded. The horizontal rods are used to fit and support the surfaces of the two sets of filter membranes.

[0012] Preferably, the two sets of trapezoidal meshes of the water inlet side support layer include a long connecting plate and a short connecting plate, which are movably fitted together. The long connecting plate and the short connecting plate pass through the filter element end cap and extend into the interior of the top shell cover. A support plate is fixedly connected to the end of the short connecting plate, and the long connecting plate passes through the support plate. An inner partition is fixedly connected to the end of the long connecting plate, and a sealing ring is fixedly connected to the outer side of the inner partition. The sealing ring is slidably connected to the interior of the top shell cover. An inner collar is fixedly connected to the center of the short connecting plate, and a driving mechanism is provided between the inner partition and the inner collar to drive the inner partition and the inner collar to separate or move closer.

[0013] Preferably, the driving mechanism includes a driving ring fixedly connected to the outside of the water outlet pipe. An inner driving groove is provided on the inner side of the driving ring, and an outer driving groove is provided on the outer side of the driving ring. An inner driven ring is movably connected inside the driving ring, and an outer driven ring is movably connected to the outer side of the driving ring. The inner driven ring is fixedly connected to the outside of the inner sleeve ring, and the outer driven ring is fixedly connected to the outside of the inner partition plate. Both the inner and outer driven rings are provided with driving pins for slidingly inserting into the inner and outer driving grooves.

[0014] Preferably, the water outlet pipe is provided with a drive device for rotating the water outlet pipe. The water outlet pipe and the water collection pipe are rotatably connected. The inner drive groove and the outer drive groove are both set as inclined grooves. The inclination directions of the inner drive groove and the outer drive groove are opposite. The drive ring drives the inner driven ring and the outer driven ring to move up and down alternately through the inner drive groove and the outer drive groove.

[0015] Preferably, the top cover is provided with an air supply pipe, and a tee is fixedly connected to the end of the air supply pipe. An air guide branch pipe and a telescopic pipe are respectively provided on the outside of the tee pipe. The air guide branch pipe is connected to the gas-liquid mixing chamber. An air guide ring is fixedly connected to the movable end of the telescopic pipe. The air guide ring is fixedly installed on the top of the inner partition and is connected to the cavity between the inner partition and the support plate.

[0016] Preferably, any set of trapezoidal perforated mesh vertical rods in the water inlet side support layer are provided with external air guide grooves. The vertical rods of two sets of trapezoidal perforated meshes are combined to form a circular external air guide groove. One set of vertical rods has a groove on its outside, and the other set of vertical rods has a protrusion on its outside. The protrusion and the groove are adapted to each other. When the protrusion is engaged with the groove, the vertical rods of the two sets of trapezoidal perforated meshes are in contact. When the protrusion and the groove are misaligned, the external air guide grooves of the vertical rods of the two sets of trapezoidal perforated meshes form a gap that connects to the outside. The bottom of the vertical rods of the two sets of trapezoidal perforated meshes is provided with movable clamps. The clamps are used to keep the bottom ends of the vertical rods of the two sets of trapezoidal perforated meshes in contact when they are misaligned and sliding.

[0017] The beneficial effects of this invention are: 1. This backwashable high-flow security filter cartridge greatly increases the filtration area by adopting a spiral winding structure for the filter membrane. Compared with traditional filter cartridges, the filtration area is effectively increased, and the filtration efficiency is effectively increased when using filter membranes with small-diameter micropores. It can both guarantee the filtration effect and improve the filtration efficiency, effectively meet the needs of high-flow filtration, and improve the operating efficiency of the entire filtration system.

[0018] 2. This backwashable high-flow-rate security filter element utilizes compressed air injected into the gas-liquid mixing chamber. During backwashing, a gas-water mixture is formed on the inlet side, with the compressed air creating microbubbles in the water. These bubbles continuously burst on the filter membrane surface and inside the filter element, generating localized high pressure and shock waves. This effectively removes stubborn contaminants from the filter membrane and filter media, providing excellent cleaning not only for impurities within the filter micropores but also for the surface of the filter membrane. This significantly improves the thoroughness of backwashing, thereby ensuring the filter element's lifespan.

[0019] 3. This backwashable high-flow security filter element uses a transverse rod to abut against the surface of the filter membrane. The transverse rods of the two sets of trapezoidal meshes scrape the surface of the filter membrane, thereby causing the transverse rods to scrape off the impurities adhering to the surface of the filter membrane. The transverse rods work in conjunction with reverse rinsing to effectively improve the backwashing effect of the filter membrane.

[0020] 4. This backwashable high-flow-rate security filter cartridge, through the inlet-side support layer and the gas-liquid mixing chamber, ensures that during backwashing, a gas-liquid mixture containing a large number of air bubbles flows out from inside the filter membrane. At the same time, the drive mechanism controls the horizontal rods on both sides of the inlet-side support layer to move up and down in a staggered manner, so that the horizontal rods can effectively remove impurities adhering to the surface of the filter membrane in conjunction with the backwash water flow. The vertical rods continuously generate the impact force of broken air bubbles, thereby effectively ensuring the cleaning effect of the filter membrane during backwashing and thus ensuring the service life of the filter. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the filter of the present invention; Figure 2 This is a cross-sectional schematic diagram of the filter housing of the present invention; Figure 3 This is a schematic diagram of the half-section structure of the present invention; Figure 4 This is a schematic diagram of the drive mechanism structure of the present invention; Figure 5 This is a schematic diagram of the driving ring structure of the present invention; Figure 6 This is a schematic diagram showing the connection of the internal drive mechanism, inner partition, and support plate of the top cover of the present invention; Figure 7 This is a partial structural diagram of the water inlet side support layer of the present invention; Figure 8 This is a schematic diagram showing the separation state of the two sets of trapezoidal perforated meshes in the water inlet side support layer of the present invention; Figure 9 This is a schematic diagram of the cross-sectional structure of the filter of the present invention; Figure 10 For the present invention Figure 8 Enlarged schematic diagram of part A; Figure 11 For the present invention Figure 8 Enlarged diagram of part B; Figure 12 This is a schematic diagram of the filter membrane and the water-producing side support layer structure of the present invention; Figure 13 This is a schematic diagram of the liquid filtration state of the filter of the present invention; Figure 14 This is a schematic diagram of the filter backwashing state of the present invention.

[0022] In the diagram: 1. Outer shell; 2. Filter membrane; 3. Inlet pipe; 4. Collector pipe; 5. Filter element end cap; 6. Top shell cap; 7. Air supply pipe; 8. Outlet pipe; 9. Drive mechanism; 21. Product water side support layer; 22. Inlet water side support layer; 31. Inlet water end cap; 41. Product water channel; 71. T-junction; 72. Air guide branch pipe; 73. Telescopic pipe; 74. Gas-liquid mixing chamber; 75. Air guide ring; 91. Drive ring; 92. Inner driven ring; 93. Outer driven ring; 911. Inner drive groove; 912. Outer drive groove; 221. Vertical rod; 222. Trapezoidal block; 223. Horizontal rod; 224. Long connecting plate; 225. Short connecting plate; 226. External air guide groove; 227. Groove part; 228. Protrusion part; 23. Support plate; 231. Inner collar; 24. Inner partition; 241. Sealing ring. Detailed Implementation

[0023] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of the present invention will be clearly and completely described below. 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.

[0024] Example 1, please refer to Figure 1 - Figure 12 A backwashable high-flow security filter element includes an outer shell 1. The outer shell 1 is provided with a filtration mechanism, which includes a water collection pipe 4 and several sets of filter membranes 2. The several sets of filter membranes 2 are spirally wound around the outside of the water collection pipe 4. The filter membranes 2 are provided with a water production side support layer 21 inside and a water inlet side support layer 22 outside. The filter membranes 2 are configured as a bag-shaped structure with a water production side support layer 21 sandwiched between the two membranes. The filter membranes 2 are welded through the water production side support layer 21, and one end and the upper and lower sides of the two membranes are welded. Water production channels 41 are evenly provided on the outside of the water collection pipe 4. The bag-shaped opening of the filter membrane 2 is bonded to the water production channel 41. A water inlet side support layer 22 is sandwiched between the two sets of filter membranes 2. A top cover 6 is fixedly connected to the top of the outer shell 1. A gas-liquid mixing chamber 74 is provided inside the top cover 6. The gas-liquid mixing chamber 74 is used to inject gas into the water collection pipe 4.

[0025] It should be noted that the filter membrane 2 is made of PTFE, with the micropore size precisely controlled within the range of 0.01-10 micrometers and the porosity of 70%-85%. By setting the small micropore size, the filter membrane 2 can effectively intercept tiny particulate pollutants, including bacteria, colloids, viruses, and submicron-sized particles, meeting the filtration requirements of extremely high water quality.

[0026] The filter membrane 2, the water production side support layer 21, and the water inlet side support layer 22 are precisely rolled into a spiral structure to form the filter element body.

[0027] By adopting a spiral winding structure for the filter membrane 2, the filtration area is greatly increased. Compared with traditional filter cartridges, the filtration area is effectively improved, and the filtration efficiency is effectively increased when using the filter membrane 2 with small pore size. This ensures both filtration effect and filtration efficiency, effectively meeting the needs of high-flow filtration and improving the overall operating efficiency of the filtration system.

[0028] Furthermore, a compressor pump is installed outside the gas-liquid mixing chamber 74. The compressor pump is used to inject compressed air into the gas-liquid mixing chamber 74. During backwashing, a gas-liquid mixed flow is formed on the water inlet side, and the compressed air forms microbubbles in the water. These bubbles continuously burst on the surface of the filter membrane and inside the filter element, generating local high pressure and shock waves, which can more effectively remove stubborn contaminants from the filter membrane and filter media. It not only has a good cleaning effect on impurities inside the filter micropores, but also effectively cleans the surface of the filter membrane 2, effectively improving the thoroughness of backwashing, thereby ensuring the service life of the filter element.

[0029] refer to Figures 1-3 In one optional embodiment, a water inlet pipe 3 is fixedly connected to the bottom of the outer shell 1, a water outlet pipe 8 is fixedly connected to the top of the outer shell 1, a water inlet end cap 31 is fixedly connected to the top of the water inlet pipe 3, the water inlet end cap 31 is fixedly connected to the bottom of the outer shell 1, the water outlet pipe 8 is connected to the top opening of the water collection pipe 4, and filter element end caps 5 are provided on both the upper and lower sides of the filter mechanism, and the upper and lower filter element end caps 5 abut against the upper and lower sides of the water inlet side support layer 22 and the filter membrane 2.

[0030] The top cover 6 is provided with an air supply pipe 7, and a tee 71 is fixedly connected to the end of the air supply pipe 7. A gas guide branch pipe 72 is provided on the outside of the tee 71, and the gas guide branch pipe 72 is connected to the gas-liquid mixing chamber 74.

[0031] The top cover 6 and the water inlet cover 31 are both sealed to the outer shell 1. The filter membrane 2 is connected to the inner cavity of the water collection pipe 4 through the bag-shaped opening. The bag-shaped opening of the filter membrane 2 is tightly welded to the water production channel 41, and the interface is sealed to ensure that the sewage enters the water collection pipe 4 after being filtered by the filter membrane 2, thereby ensuring the filtration effect.

[0032] It should be noted that the upper and lower filter element end caps 5 are used to support and fix the water inlet side support layer 22 and the water product side support layer 21, in order to ensure the structural stability of the overall filter membrane 2 and avoid damage to the filter membrane 2 due to structural instability during filtration or backwashing.

[0033] The filter chamber is formed between the upper and lower filter element end caps 5 and the filter membrane 2.

[0034] refer to Figure 13 During operation, the water to be filtered enters through the inlet pipe 3 and flows spirally along the inlet side support layer 22. The water passes through the filter membranes on both sides of the filter membrane 2 laterally. After filtration, the produced water flows spirally along the produced water side support layer 21 and flows into the collecting pipe 4 through the produced water channel 41. After collection, the produced water flows from the top end of the collecting pipe 4 to the outlet pipe 8 and then flows out through the outlet pipe 8.

[0035] Furthermore, during the filtration process, the gas supply pipe 7 is in a closed state.

[0036] Furthermore, pressure detectors are installed at the inlet pipe 3 and outlet pipe 8 ports, and a backwash controller is also installed on the outside of the filter. The backwash controller is configured with the following backwash program: When the pressure difference between the inlet pipe 3 and the outlet pipe 8 of the filter element reaches the set value, or when the preset filtration time is reached, the backwashing program will be started automatically.

[0037] The differential pressure setting is set to 0.05-0.1 MPa; The filtration time is set to run continuously for 8-12 hours.

[0038] refer to Figure 14 During backwashing, backwash water enters from the outlet pipe 8 and passes through the filter element in the opposite direction to normal filtration. The flow rate of the backwash water is controlled at 2-3 times the normal filtration flow rate.

[0039] Furthermore, during backwashing, the air supply pipe 7 is opened, and the compressor pump pumps compressed air into the gas-liquid mixing chamber 74 through the air supply pipe 7, causing a large number of air bubbles to mix inside the backwash water flow, forming a gas-water mixed flow. These air bubbles continuously burst on the surface of the filter membrane 2 and inside the filter micropores, generating local high pressure and shock waves. The shock waves can be used to more effectively remove stubborn pollutants from the surface of the filter membrane 2 and inside the filter micropores, improving the thoroughness of backwashing.

[0040] Wastewater containing impurities generated during backwashing is discharged through the other end of inlet pipe 3 to ensure that it will not affect the subsequent filtration process.

[0041] After backwashing, the filtration performance of the filter element can be effectively restored, and the pressure difference is reduced to near its initial state, so that it can continue to be put into normal filtration work, effectively ensuring the service life of the filter.

[0042] Example 2, Reference Figure 7 , Figure 8 and Figure 12 Furthermore, based on Example 1, the water production side support layer 21 is configured as a rhomboid mesh, the two membranes of the filter membrane 2 are welded to both sides of the water inlet side support layer 22, and the water inlet side support layer 22 is configured as two sets of parallel trapezoidal meshes, with the two sets of trapezoidal meshes being fitted and movably connected.

[0043] It should be noted that by setting the water production side support layer 21 as a diamond-shaped mesh, the support effect on the filter membrane 2 is ensured, the filter membrane 2 is prevented from deforming under high pressure filtration environment, and the filtration effect is guaranteed. At the same time, the water production resistance is reduced, and the filtration effect of the filter membrane 2 is improved.

[0044] By setting the inlet-side support layer 22 as a trapezoidal mesh, it is easier to remove impurities from the filter membrane 2 during backwashing, thereby improving the backwashing effect of the filter membrane 2.

[0045] refer to Figure 7 and Figure 8 The inlet-side support layer 22 includes a vertical rod 221, a trapezoidal block 222 fixedly connected to the outside of the vertical rod 221, and a horizontal rod 223 fixedly connected to the outside of the trapezoidal block 222. A set of vertical rods 221, trapezoidal blocks 222, and horizontal rods 223 constitute a set of trapezoidal mesh. The trapezoidal mesh adopts a structure where the vertical rods 221 are thick and the horizontal rods 223 are thin. The surface of the horizontal rods 223 is rounded. The horizontal rods 223 are used to fit and support the surfaces of the two sets of filter membranes 2.

[0046] It should be noted that the transverse rod 223 abuts against the surface of the filter membrane 2 to support the filter membrane 2 so as not to be damaged during backwashing, and to allow impurities adhering to the surface of the filter membrane 2 to be discharged smoothly.

[0047] Example 3, Reference Figure 3 and Figure 8 Furthermore, based on Embodiment 2, the two sets of trapezoidal meshes of the water inlet side support layer 22 respectively include a long connecting plate 224 and a short connecting plate 225. The long connecting plate 224 and the short connecting plate 225 are movably fitted together. The long connecting plate 224 and the short connecting plate 225 penetrate the filter element end cover 5 and extend into the interior of the top cover 6. A support plate 23 is fixedly connected to the end of the short connecting plate 225. The long connecting plate 224 penetrates the support plate 23. An inner partition 24 is fixedly connected to the end of the long connecting plate 224. A sealing ring 241 is fixedly connected to the outer side of the inner partition 24. The sealing ring 241 is slidably connected to the interior of the top cover 6. An inner collar 231 is fixedly connected to the center of the short connecting plate 225. A driving mechanism 9 is provided between the inner partition 24 and the inner collar 231 to drive the inner partition 24 and the inner collar 231 to separate or move closer.

[0048] It should be noted that both sets of trapezoidal mesh are abutted against the surface of the filter membrane 2 by transverse rods 223, and the drive mechanism 9 drives the two sets of trapezoidal mesh to move up and down alternately through the long connecting plate 224 and the short connecting plate 225, thereby driving the transverse rods 223 of the two sets of trapezoidal mesh to scrape the surface of the filter membrane 2, thereby driving the transverse rods 223 to scrape off the impurities adhering to the surface of the filter membrane 2. Through the transverse rods 223 in conjunction with backwashing, the backwashing effect of the filter membrane 2 is effectively improved.

[0049] It should be noted that the inner partition 24 and the sealing ring 241 are used to seal the filter chamber to prevent liquid from flowing out from the end during the filtration process, and to ensure that all liquid flows out only after filtration.

[0050] Among them, a rubber ring is provided on the outside of the sealing ring 241 to improve the sealing performance of the filter chamber.

[0051] The outer edge of the support plate 23 is attached to the inside of the top cover 6, and the long connecting plate 224 is in sealed contact with the support plate 23. The support plate 23 is further used to seal and isolate the filter chamber.

[0052] The double isolation provided by the support plate 23 and the inner partition plate 24 ensures the stability of the water filtration process and effectively prevents liquid leakage from the top.

[0053] refer to Figure 4 and Figure 5 In an optional embodiment, the drive mechanism 9 includes a drive ring 91 fixedly connected to the outside of the water outlet pipe 8. The inner side of the drive ring 91 is provided with an inner drive groove 911, and the outer side of the drive ring 91 is provided with an outer drive groove 912. An inner driven ring 92 is movably connected to the inside of the drive ring 91, and an outer driven ring 93 is movably connected to the outside of the drive ring 91. The inner driven ring 92 is fixedly connected to the outside of the inner sleeve ring 231, and the outer driven ring 93 is fixedly connected to the outside of the inner partition plate 24. Both the inner driven ring 92 and the outer driven ring 93 are provided with drive pins for slidingly inserting into the inner drive groove 911 and the outer drive groove 912.

[0054] It should be noted that the drive mechanism 9 starts and stops synchronously with the backwashing. When the drive mechanism 9 starts, the drive ring 91 drives the outer driven ring 93 and the inner driven ring 92 to move up and down alternately through the outer drive groove 912 and the inner drive groove 911, respectively.

[0055] refer to Figure 5 The water outlet pipe 8 is equipped with a drive device for rotating the water outlet pipe 8. The water outlet pipe 8 and the water collection pipe 4 are rotatably connected. The inner drive groove 911 and the outer drive groove 912 are both set as inclined grooves. The inclination directions of the grooves of the inner drive groove 911 and the outer drive groove 912 are opposite. The drive ring 91 drives the inner driven ring 92 and the outer driven ring 93 to move alternately up and down through the inner drive groove 911 and the outer drive groove 912.

[0056] It should be noted that by setting the inner drive groove 911 and the outer drive groove 912 to be tilted in opposite directions, the high point of the inner drive groove 911 corresponds to the low point of the outer drive groove 912, and the low point of the inner drive groove 911 corresponds to the high point of the outer drive groove 912. Therefore, during the rotation of the drive ring 91, the inner driven ring 92 and the outer driven ring 93 move back and forth towards or away from each other. The inner driven ring 92 drives the short connecting plate 225 to move back and forth, and the outer driven ring 93 drives the long connecting plate 224 to move back and forth.

[0057] The reciprocating motion of the long connecting plate 224 and the short connecting plate 225 drives the two sets of trapezoidal mesh to reciprocate, which in turn drives the horizontal rods 223 of the two sets of trapezoidal mesh to reciprocate up and down. This completes the work of scraping impurities from the surface of the filter membrane 2 by driving the horizontal rods 223 of the inlet side support layer 22, thereby effectively ensuring the cleaning effectiveness of the filter membrane 2.

[0058] refer to Figure 6 In an optional embodiment, an air supply pipe 7 is provided on the outside of the top cover 6. A tee 71 is fixedly connected to the end of the air supply pipe 7. An air guide branch pipe 72 and a telescopic pipe 73 are respectively provided on the outside of the tee 71. The air guide branch pipe 72 is connected to the gas-liquid mixing chamber 74. An air guide ring 75 is fixedly connected to the movable end of the telescopic pipe 73. The air guide ring 75 is fixedly installed on the top of the inner partition 24 and connects the cavity between the inner partition 24 and the support plate 23.

[0059] Specifically, during backwashing, the compressor pump introduces compressed air into the air supply pipe 7, and the air is diverted through the tee 71 to the air guide branch pipe 72 and the telescopic pipe 73.

[0060] In this process, compressed air from inside the air guide branch pipe 72 enters the gas-liquid mixing chamber 74. The compressed air mixes with the backwash water in the gas-liquid mixing chamber 74 to form a gas-liquid mixture, which causes a large number of bubbles to form inside the backwash water flow. The backwash water flow containing bubbles is used to backwash the filter membrane 2, thereby improving the backwashing effect.

[0061] Furthermore, compressed air inside the telescopic tube 73 enters the air guide ring 75, and then enters the space between the inner partition 24 and the support plate 23 through the air guide ring 75.

[0062] refer to Figure 7 , Figure 8 , Figure 10 and Figure 11 The vertical rods 221 of any set of trapezoidal perforated meshes on the water inlet side support layer 22 are provided with external air guide grooves 226. The vertical rods 221 of the two sets of trapezoidal perforated meshes are combined to form a circular external air guide groove 226. A groove 227 is provided on the outside of one set of vertical rods 221, and a protrusion 228 is provided on the outside of the other set of vertical rods 221. The protrusion 228 is adapted to the groove 227. When the protrusion 228 is engaged with the groove 227, the vertical rods 221 of the two sets of trapezoidal perforated meshes are in contact. When the protrusion 228 and the groove 227 are misaligned, the external air guide grooves 226 of the vertical rods 221 of the two sets of trapezoidal perforated meshes form a gap that connects to the outside. Movable clamps are provided at the bottom of the vertical rods 221 of the two sets of trapezoidal perforated meshes. The clamps are used to keep the bottom ends of the vertical rods 221 of the two sets of trapezoidal perforated meshes in contact when they are misaligned and sliding.

[0063] It should be noted that during the filtration stage, the vertical rods 221 of the two sets of trapezoidal mesh are in a fitted state, and the external air guide groove 226 is isolated from the filter chamber.

[0064] During the backwashing process, compressed air inside the telescopic pipe 73 enters between the inner partition 24 and the support plate 23, and then the compressed air enters the outer air guide groove 226.

[0065] Simultaneously, during the backwashing process, the drive mechanism 9 drives the two sets of trapezoidal mesh to perform cyclical misalignment. When the protrusion 228 and the groove 227 are misaligned and disengaged, a gap is formed between the two sets of vertical rods 221. At the same time, when the protrusion 228 and the groove 227 overlap, the two sets of vertical rods 221 merge. During the merging process, the two sets of vertical rods 221 clamp and break the bubbles overflowing from the outer air guide groove 226, thereby further forming an impact force of bubble breaking on the outside of the filter membrane 2. By continuously generating bubble breaking force to impact the surface of the filter membrane 2, the cleaning effect of surface impurities on the filter membrane 2 during the backwashing process is further improved, thereby effectively ensuring that the filter membrane 2 returns to a near-initial state after backwashing, thus effectively ensuring the service life of the filter, reducing the trouble of frequent filter element replacement, and reducing the cost of filter element replacement.

[0066] By using the inlet-side support layer 22 in conjunction with the gas-liquid mixing chamber 74, a gas-liquid mixture containing a large number of air bubbles flows out of the filter membrane 2 during backwashing. At the same time, the drive mechanism 9 controls the horizontal rods 223 on both sides of the inlet-side support layer 22 to move up and down in a staggered manner, so that the horizontal rods 223 can effectively remove impurities adhering to the surface of the filter membrane 2 in conjunction with the backwashing water flow. The vertical rod 221 continuously generates a breaking air bubble impact force outside, thereby effectively ensuring the cleaning effect of the filter membrane 2 during backwashing, and thus ensuring the service life of the filter.

[0067] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A backwashable high-flow-rate security filter element, comprising a housing (1), wherein a filtration mechanism is disposed inside the housing (1), characterized in that: The filtration mechanism includes a water collection pipe (4) and several sets of filter membranes (2). Several sets of filter membranes (2) are spirally wound around the outside of the water collection pipe (4). The inside of the filter membrane (2) is provided with a water production side support layer (21), and the outside of the filter membrane (2) is provided with a water inlet side support layer (22). The filter membrane (2) is configured as a bag-shaped structure, with a water production side support layer (21) sandwiched between the two membranes. The filter membrane (2) is welded through the water production side support layer (21), and one end and the upper and lower sides of the two membranes are welded. Water production channels (41) are evenly opened on the outside of the water collection pipe (4). The bag-shaped opening of the filter membrane (2) is bonded to the water production channel (41). A water inlet side support layer (22) is sandwiched between the two sets of filter membranes (2). The top of the outer shell (1) is fixedly connected to a top cover (6), and the inside of the top cover (6) is provided with a gas-liquid mixing chamber (74), which is used to pump gas into the water collection pipe (4).

2. The backwashable high-flow-rate security filter element according to claim 1, characterized in that: The bottom of the outer shell (1) is fixedly connected to a water inlet pipe (3), the top of the outer shell (1) is fixedly connected to a water outlet pipe (8), the top of the water inlet pipe (3) is fixedly connected to a water inlet end cap (31), the water inlet end cap (31) is fixedly connected to the bottom of the outer shell (1), the water outlet pipe (8) is connected to the top opening of the water collection pipe (4), and filter element end caps (5) are provided on both the upper and lower sides of the filter mechanism. The upper and lower filter element end caps (5) abut against the upper and lower sides of the water inlet side support layer (22) and the filter membrane (2).

3. The backwashable high-flow-rate security filter element according to claim 1, characterized in that: The water production side support layer (21) is configured as a rhomboid mesh, and the two layers of the filter membrane (2) are welded to both sides of the water inlet side support layer (22). The water inlet side support layer (22) is configured as two sets of parallel trapezoidal meshes, and the two sets of trapezoidal meshes are connected in a close fit.

4. The backwashable high-flow-rate security filter element according to claim 3, characterized in that: The inlet-side support layer (22) includes a vertical rod (221), a trapezoidal block (222) is fixedly connected to the outside of the vertical rod (221), and a horizontal rod (223) is fixedly connected to the outside of the trapezoidal block (222). A set of vertical rods (221), trapezoidal blocks (222), and horizontal rods (223) constitute a set of trapezoidal mesh. The trapezoidal mesh adopts a structure in which the vertical rods (221) are thick and the horizontal rods (223) are thin. The surface of the horizontal rods (223) is polished and rounded. The horizontal rods (223) are used to fit and support the surfaces of the two sets of filter membranes (2).

5. The backwashable high-flow-rate security filter element according to claim 4, characterized in that: The two sets of trapezoidal meshes of the water inlet side support layer (22) include a long connecting plate (224) and a short connecting plate (225). The long connecting plate (224) and the short connecting plate (225) are movably fitted together. The long connecting plate (224) and the short connecting plate (225) penetrate through the filter element end cover (5) and extend into the interior of the top shell cover (6). The end of the short connecting plate (225) is fixedly connected to a support plate (23), and the long connecting plate (224) penetrates through the support plate (23). An inner partition (24) is fixedly connected to the end of the long connecting plate (224), and a sealing ring (241) is fixedly connected to the outside of the inner partition (24). The sealing ring (241) is slidably connected to the inside of the top cover (6). An inner collar (231) is fixedly connected to the center of the short connecting plate (225). A drive mechanism (9) is provided between the inner partition (24) and the inner collar (231) to drive the inner partition (24) and the inner collar (231) to separate or approach each other.

6. The backwashable high-flow-rate security filter element according to claim 5, characterized in that: The drive mechanism (9) includes a drive ring (91) fixedly connected to the outside of the water outlet pipe (8). The inner side of the drive ring (91) is provided with an inner drive groove (911), and the outer side of the drive ring (91) is provided with an outer drive groove (912). The inner driven ring (92) is movably connected to the inside of the drive ring (91), and the outer driven ring (93) is movably connected to the outside of the drive ring (91). The inner driven ring (92) is fixedly connected to the outside of the inner sleeve ring (231), and the outer driven ring (93) is fixedly connected to the outside of the inner partition plate (24). Both the inner driven ring (92) and the outer driven ring (93) are provided with drive pins for slidingly inserting into the inner drive groove (911) and the outer drive groove (912).

7. The backwashable high-flow-rate security filter element according to claim 6, characterized in that: The water outlet pipe (8) is provided with a drive device for driving the water outlet pipe (8) to rotate. The water outlet pipe (8) and the water collection pipe (4) are rotatably connected. The inner drive groove (911) and the outer drive groove (912) are both set as inclined grooves. The grooves of the inner drive groove (911) and the outer drive groove (912) are inclined in opposite directions. The drive ring (91) drives the inner driven ring (92) and the outer driven ring (93) to move up and down alternately through the inner drive groove (911) and the outer drive groove (912).

8. The backwashable high-flow-rate security filter element according to claim 5, characterized in that: The top cover (6) is provided with an air supply pipe (7) on its outside. A tee (71) is fixedly connected to the end of the air supply pipe (7). A gas guide branch pipe (72) and a telescopic pipe (73) are respectively provided on the outside of the tee (71). The gas guide branch pipe (72) is connected to the gas-liquid mixing chamber (74). A gas guide ring (75) is fixedly connected to the movable end of the telescopic pipe (73). The gas guide ring (75) is fixedly installed on the top of the inner partition (24). The gas guide ring (75) is connected to the cavity between the inner partition (24) and the support plate (23).

9. A backwashable high-flow-rate security filter element according to claim 8, characterized in that: The vertical rods (221) of any set of trapezoidal mesh in the water inlet side support layer (22) are provided with external air guide grooves (226). The vertical rods (221) of two sets of trapezoidal mesh are combined to form a circular external air guide groove (226). A groove (227) is provided on the outside of one set of vertical rods (221), and a protrusion (228) is provided on the outside of the other set of vertical rods (221). The protrusion (228) is adapted to the groove (227). 228) When the card is inserted into the groove (227), the vertical rods (221) of the two sets of trapezoidal mesh are in contact. When the protrusion (228) and the groove (227) are misaligned, the outer air guide groove (226) of the vertical rods (221) of the two sets of trapezoidal mesh forms a gap that connects to the outside. The bottom of the vertical rods (221) of the two sets of trapezoidal mesh is provided with a movable clamp. The clamp is used to keep the bottom ends of the vertical rods (221) of the two sets of trapezoidal mesh in contact when they are misaligned and sliding.

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