Efficient sewage separation nanofiltration membrane device

Abstract

The invention belongs to the technical field of sewage separation nanofiltration membrane devices, and particularly relates to an efficient sewage separation nanofiltration membrane device which comprises a filter membrane core shell, a central pipe is longitudinally and rotatably connected to the central position in the filter membrane core shell, and a nanofiltration membrane cylinder is sleeved with the position, located in the filter membrane core shell, of the outer side of the central pipe. The upper end and the lower end of the filter membrane core shell are in threaded connection with sealing covers; shunting assemblies are distributed on the outer wall of the central pipe at equal intervals in the length direction; the flow dividing assembly comprises a base ring rotationally arranged on the outer wall of the center pipe. The water body discharged from the central pipe is disturbed through the shunting assembly, the situation that the water body directly impacts on the nanofiltration membrane to attach ions can be prevented, an attachment point is provided for the ions by utilizing the horn and the pasty spoiler, and part of the water body is conveyed downwards (in a fan-shaped external expansion manner and is not limited to a downward flowing track); and ions generated by filtration are concentrated on the lower half part of the nanofiltration membrane, so that the service life of the nanofiltration membrane cylinder is prolonged.

Description

Technical Field

[0001] The invention belongs to the technical field of sewage separation nanofiltration membrane devices, and in particular relates to a high-efficiency sewage separation nanofiltration membrane device. Background Art

[0002] Nanofiltration membrane is a functional semi-permeable membrane that allows solvent molecules or certain low molecular weight solutes or low-valent ions to pass through. It is named because the size of the substances it can retain is approximately nanometer level. It is used to remove organic matter and color from surface water, remove the hardness of groundwater, partially remove soluble salts, concentrate fruit juice, and separate useful substances in medicines.

[0003] After searching, the Chinese patent with authorization announcement number CN222766032U discloses a reverse osmosis nanofiltration membrane assembly. Through the reinforcement mechanism set up, after the docking sleeve is connected to the input port of the central tube, the movable cover is slid off the docking sleeve, so that the limit groove set inside the movable cover is docked with the limit rod, and then the insertion rod is extended outward by pulling the hand pull plate, so that the position of the insertion rod is aligned with the position of the socket, and the hand pull plate is released. Under the action of the reset spring, the insertion rod is docked with the socket, thereby realizing the reinforcement of the docking sleeve. At the same time, the set sealing ring 2 can improve the sealing degree, so that when the reverse osmosis nanofiltration membrane assembly is used, the docking operation is simple and the disassembly and assembly are convenient, thereby improving the service life of the reverse osmosis nanofiltration membrane assembly.

[0004] However, the water inside the central tube of the above-mentioned reverse osmosis nanofiltration membrane assembly is pressurized and sent in with the help of an external water pump, and finally the water body is filtered through the infiltration hole. Since the water entering the central tube has a certain water pressure, the position where the water discharged from the infiltration hole contacts the reverse osmosis nanofiltration membrane is fixed. Over time, spotted dirt areas will form on the inner wall of the reverse osmosis nanofiltration membrane. Since the components of the dirt are tiny ions (such as lead, cadmium, mercury, arsenic, etc.), these dirt ions will invade and expand on the surface of the reverse osmosis nanofiltration membrane, reducing the infiltration efficiency of the area, and even causing the reverse osmosis nanofiltration membrane in the area to rupture due to the high water pressure, thereby shortening the service life of the nanofiltration membrane. Summary of the Invention

[0005] Based on this, the purpose of the present invention is to provide an efficient sewage separation nanofiltration membrane device to solve the technical problems raised in the above background.

[0006] To achieve the above objectives, the present invention provides the following technical solutions: an efficient sewage separation nanofiltration membrane device, comprising a membrane core housing, a central tube longitudinally rotatably connected to the center position of the inner portion of the membrane core housing, a nanofiltration membrane cartridge sleeved on the outer side of the central tube located within the membrane core housing, sealing caps threadedly connected to the upper and lower ends of the membrane core housing, and diversion components distributed at equal intervals along the outer wall of the central tube along its length; The flow diversion component includes a base ring rotatably mounted on the outer wall of the central tube, a horn is fixedly sleeved on the curved outer wall of the base ring, and the outer side of the horn is provided with equidistant grooves along its circular circumference. An arc-shaped spoiler is fixed in each group of the horn grooves, and the bottom of the arc-shaped spoiler is inclined toward the center of the base ring. Two groups of fins are fixed on the curved inner wall of the horn and near the edge positions of two adjacent groups of fins. The two groups of fins form a storage groove on the inner wall of the horn, and an L-shaped nanofiltration membrane is fixedly connected to the bottom of the storage groove. Fan blades are fixed inside the central tube near the upper and lower ends. The curved outer wall of the central tube is provided with tapered holes at equal intervals in a spiral shape. The tapered holes are provided at a position where the outer wall of the central tube is aligned with the horn. The outer wall of the central tube is provided with a diverter cap rotatably connected to the tapered hole. The end face of the diverter cap is symmetrically provided with two groups of main holes, and the outer walls on both sides of the diverter cap are provided with two groups of secondary holes tangent to the inner wall of the diverter cap.

[0007] As an optimal technical solution, the outer wall of the central tube and the nanofiltration membrane cylinder constitute a first chamber, the outer wall of the nanofiltration membrane cylinder and the inner wall of the membrane core shell constitute a second chamber, and the inner and outer sides of the nanofiltration membrane cylinder are fixed with supporting nets in the first chamber and the second chamber.

[0008] As an optimal technical solution, the inner walls of the end faces of the two groups of sealing covers are fixed with receiving plates that are in contact with the upper and lower ends of the center tube, the outer wall of the center tube is fixed with an inner ring that fits with the receiving plate, the outer wall of the inner ring is sleeved with an outer ring cover fixed to the end face of the receiving plate, and a plurality of groups of first balls are provided for rolling at the contact position between the end face of the outer ring cover and the inner ring.

[0009] As an optimal technical solution, the top of the central tube is connected to an input tube that passes through the top of the sealing cover. The input tube is fixed in the sealing cover by means of threads. Two sets of discharge tubes connected to the second chamber are provided on the outer wall of the filter membrane core shell near the upper and lower end surfaces.

[0010] As an optimal technical solution, a positioning ring groove is provided at the position where the curved outer wall of the center tube contacts each group of the base rings, and balls are rolled on the upper and lower annular inner walls of the positioning ring groove. The number of the balls is multiple groups and distributed in an annular array, and the upper and lower end faces of the positioning ring groove are provided with concave ring grooves adapted to the balls.

[0011] As a preferred technical solution, a tapered hole with a spiral trajectory is opened on the outer wall of the central tube and in the area corresponding to each group of the horn tubes.

[0012] As a preferred technical solution, the inclinations in the multiple groups of horns increase from top to bottom along the length direction of the central tube.

[0013] As an optimal technical solution, a ring rotatably connected to the tapered hole is fixed on the end face of the diverter cap, a ring groove matching the ring is opened on the curved inner wall of the tapered hole, and the inner taper of the ring matches the tapered hole.

[0014] As an optimal technical solution, a positioning piece fixed to the inner wall of the supporting net is provided near the bottom of the outer wall of each group of the horn, and a sewage discharge channel is formed between the outer wall of the arc-shaped spoiler and the inner wall of the supporting net.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The present invention disturbs the water discharged from the central tube through the diversion component, which can prevent the water from directly colliding with the nanofiltration membrane and attaching ions. The horn and the paste-like spoiler are used to provide attachment points for the ions, which will transport part of the water downward, so that the ions generated by the filtration are concentrated in the lower half of the nanofiltration membrane, thereby extending the service life of the nanofiltration membrane cartridge.

[0016] The present invention utilizes the pressure brought by the water entering the central tube to squeeze the fan blades, causing the central tube to rotate along its own axis. The water discharged through the tapered hole will come into contact with the horn in multiple directions (at this time, the collision with the horn causes the water to expand outward in a fan shape), so that a large number of ions in the water can adhere to the horn, which can share the clogging of the nanofiltration membrane tube, thereby preventing a large number of ions from contacting the inner wall of the nanofiltration membrane tube and causing clogging.

[0017] The present invention reduces the frictional resistance of the water flow as the internal diameter of the water discharged from the tapered hole changes, making the flow velocity of the water more evenly distributed, reducing eddy currents and impulses, and at the same time accelerating the flow velocity of the local water body, enhancing the flushing effect on ions attached to the inner wall of the tapered hole, thereby reducing the risk of ions attaching to and depositing in the tapered hole, and ensuring the efficiency of water discharge from the center tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic structural diagram of the nanofiltration membrane core group of the present invention; Figure 2 Schematic diagram of the cross-sectional structure of the filter membrane core housing of the present invention; Figure 3 Schematic diagram of the internal structure of the nanofiltration membrane core of the present invention; Figure 4 Schematic diagram of the outer wall structure of the central tube of the present invention; Figure 5 This is a schematic diagram of the connection structure between the central tube and the filter membrane core housing of the present invention; Figure 6 Schematic diagram of the three-dimensional structure of the diversion component of the present invention; Figure 7 It is a schematic diagram of a partial top view of the diversion component of the present invention; Figure 8 Schematic diagram of the cross-sectional structure of the diversion component of the present invention; Figure 9 Schematic diagram of the top structure of the central tube of the present invention; Figure 10 Schematic diagram of the bottom structure of the central tube of the present invention; Figure 11 Schematic diagram of the three-dimensional structure of the diverter cap of the present invention; Figure 12 This is a schematic diagram of the end cross-sectional structure of the diverter cap of the present invention.

[0019] In the figure: 100, filter membrane core housing; 200, diverter assembly; 110, nanofiltration membrane cartridge; 120, central tube; 121, positioning ring groove; 122, receiving plate; 123, ball; 124, tapered hole; 125, diverter cap; 126, fan blade; 127, ring; 128, auxiliary hole; 129, main hole; 130, sealing cover; 140, discharge pipe; 150, inlet pipe; 160, first chamber; 170, second chamber; 180, supporting net enclosure; 190, inner ring; 191, outer ring cover; 210, base ring; 211, concave ring groove; 220, horn; 230, give way groove; 240, arc-shaped spoiler; 250, positioning piece; 260, wing; 270, storage tank; 280, L-shaped nanofiltration membrane. DETAILED DESCRIPTION

[0020] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be understood as limiting the present invention.

[0021] The following describes an embodiment of the present invention based on its overall structure.

[0022] An efficient sewage separation nanofiltration membrane device, such as Figures 1 to 12 As shown, it includes a membrane core housing 100, a central tube 120 is longitudinally connected to the center position of the inner portion of the membrane core housing 100, a nanofiltration membrane cartridge 110 is sleeved on the outer side of the central tube 120 and located inside the membrane core housing 100, and sealing caps 130 are threadedly connected to the upper and lower ends of the membrane core housing 100, and the outer wall of the central tube 120 is evenly spaced along its length. The flow diversion assembly 200 includes a base ring 210 rotatably mounted on the outer wall of the central tube 120. A horn 220 is fixedly sleeved on the curved outer wall of the base ring 210. The outer side of the horn 220 is provided with equidistantly spaced clearance grooves 230 along its circular circumference. An arc-shaped spoiler 240 is fixed in each set of clearance grooves 230. The bottom of the arc-shaped spoiler 240 is inclined toward the center of the base ring 210. Two sets of fins 260 are fixed on the curved inner wall of the horn 220 and near the edges of two adjacent sets of clearance grooves 230. The two sets of fins 260 form a storage groove 270 on the inner wall of the horn 220. An L-shaped nanofiltration membrane 280 is fixedly connected to the bottom of the storage groove 270. Fan blades 126 are fixed inside the center tube 120 near the upper and lower ends. The curved outer wall of the center tube 120 is provided with tapered holes 124 equidistantly spaced in a spiral shape. The tapered holes 124 are provided at a position where the outer wall of the center tube 120 is aligned with the horn 220. The outer wall of the center tube 120 is provided with a diverter cap 125 rotatably connected to the tapered hole 124. The end surface of the diverter cap 125 is symmetrically provided with two sets of main holes 129. The outer walls of the diverter cap 125 on both sides are provided with two sets of secondary holes 128 tangential to the inner wall of the diverter cap 125. The inclination of the multiple groups of horns 220 increases from top to bottom along the length of the central tube 120; A positioning piece 250 is provided on the outer wall of each set of horn tubes 220 near the bottom, which is fixed to the inner wall of the support net 180. A sewage channel is formed between the outer wall of the arc-shaped spoiler 240 and the inner wall of the support net 180. The clearance grooves 230 formed on the outer walls of the upper and lower adjacent groups of horn tubes 220 are distributed in a staggered state.

[0023] When the external water is transported to the interior of the central tube 120, since the internal aperture of the tapered hole 124 is smaller than the diameter of the central tube 120, the drainage volume of the tapered hole 124 will also be smaller than the water intake volume of the central tube 120. At this time, the interior of the central tube 120 will be filled with water, and the tapered hole 124 will discharge water into the first chamber 160 in real time. Therefore, the water inside the central tube 120 flows from top to bottom, and the water will hit the fan blades 126 in the central tube 120. At this time, the central tube 120 will rotate inside the multiple groups of base rings 210, and the water discharged through the spirally arranged tapered hole 124 will be in the shape of a naked line vortex. The water will be sprayed onto the curved inner wall of the horn 220 and the arc-shaped spoiler 240. Since the first chamber 160 in the horn 220 is also filled with water, its first chamber 160 The water in the first chamber 160 will generate resistance to the water just discharged from the tapered hole 124. Therefore, the water just discharged from the tapered hole 124 will bend its discharge trajectory downward due to the resistance, and will eventually contact the curved inner wall of the horn 220 and the arc-shaped spoiler 240. The water discharged from the tapered hole 124 will generate vertical and tangential forces with the horn 220 and the arc-shaped spoiler 240. The vertical impact force will cause some ions in the water (such as lead, cadmium, mercury, arsenic, etc.) to adhere thereto, and the tangential impact force will cause the water and ions to flow downward along the horn 220 and the arc-shaped spoiler 240 until they contact the L-shaped nanofiltration membrane 280, which blocks the ions and retains them in the storage tank 270, thereby preventing a large number of ions from contacting the inner wall of the nanofiltration membrane cartridge 110 and causing blockage. As the internal diameter of the water discharged from the tapered hole 124 changes, the frictional resistance of the water flow is reduced, making the flow velocity of the water more evenly distributed, reducing eddy currents and impulses. At the same time, the flow velocity of the water is accelerated locally, enhancing the flushing effect on ions attached to the inner wall of the tapered hole 124, thereby reducing the risk of ions attaching to and depositing in the tapered hole 124, and ensuring the discharge efficiency of the water inside the central tube 120. The water flowing into the tapered hole 124 is discharged through the main hole 129 formed on the end face of the diverter cap 125 and is discharged through the auxiliary hole 128 at the same time. The water discharged from the two sets of auxiliary holes 128 is in opposite directions and generates a thrust in the opposite direction on the diverter cap 125, causing the diverter cap 125 to rotate at the end of the tapered hole 124, thereby causing the water discharged from the main hole 129 to be discharged in a spiral vortex shape, so that the water contacts the inner wall of the horn 220 and the curved surface of the arc-shaped spoiler 240 in an annular shape (generating vertical and tangential impact forces), causing a large number of ions in the water to adhere to the inner wall of the horn 220 and the curved spoiler 240, thereby increasing the total amount of ions retained in the inner wall of the horn 220 and the curved spoiler 240 and the storage tank 270, thereby indirectly extending the service life of the nanofiltration membrane cartridge 110; A sewage channel is formed between the outer wall of the arc-shaped spoiler 240 and the supporting mesh 180, through which the water inside the central tube 120 can flow downward, and through which ions flowing downward along the arc-shaped spoiler 240 can pass (the filtration condition of the nanofiltration membrane requires the use of a pressure difference, so the water will not only approach the direction of the nanofiltration membrane, but will also generate a tangential force due to the collision with the horn 220 and the arc-shaped spoiler 240, causing the water to surge downward). This will drive the water and ions to flow downward in a concentrated manner, thereby reducing the probability of adhesion to the curved inner wall of the nanofiltration membrane cartridge 110 and improving the filtration efficiency of the nanofiltration membrane cartridge 110; Since the inner tapers of each group of horns 220 distributed on the outer wall of the central tube 120 are different, the vertical and tangential forces generated by the water discharged from the conical hole 124 colliding with the horns 220 are different, and the total amount of ions attached to or retained on the inner walls of the horns 220 and the arc-shaped spoilers 240 will also decrease from top to bottom. Therefore, the total amount of ions attached to the outer wall of the nanofiltration membrane cartridge 110 increases as it moves toward the bottom, and the number of ions attached to the horns 220 and the arc-shaped spoilers 240 decreases as they move toward the top. This allows the ions to be relatively evenly distributed in the upper and lower parts of the filter membrane core housing 100, and can ensure the water permeability of the nanofiltration membrane cartridge 110, thereby improving the filtration efficiency of the nanofiltration membrane and extending its service life.

[0024] Please refer to Figure 2 and Figure 3 The outer wall of the central tube 120 and the nanofiltration membrane cartridge 110 form a first chamber 160, the outer wall of the nanofiltration membrane cartridge 110 and the inner wall of the membrane core shell 100 form a second chamber 170, and the inner and outer sides of the nanofiltration membrane cartridge 110 are located in the first chamber 160 and the second chamber 170 and are fixed with a supporting net 180.

[0025] The supporting mesh 180 inside and outside the nanofiltration membrane cartridge 110 has strong toughness, which can better cope with the impact force generated by the water body, thereby extending the service life of the nanofiltration membrane cartridge 110.

[0026] Please refer to Figure 5 and Figure 9 The inner walls of the end faces of the two sets of sealing covers 130 are fixed with receiving plates 122 that are in contact with the upper and lower ends of the center tube 120. The outer wall of the center tube 120 is fixed with an inner ring 190 that fits with the receiving plate 122. The outer wall of the inner ring 190 is sleeved with an outer ring cover 191 fixed to the end face of the receiving plate 122. A plurality of groups of first balls are provided for rolling at the contact position between the end face of the outer ring cover 191 and the inner ring 190.

[0027] The upper and lower receiving plates 122 seal the two ends of the membrane core housing 100, ensuring a closed space inside the membrane core housing 100 to prevent the incoming water from leaking from both ends. The inner ring 190 and the outer ring cover 191 cooperate with each other, so that the central tube 120 can be longitudinally rotated in the filter membrane core housing 100. When water is input into the central tube 120, it can rotate along the axis of the central tube 120 itself.

[0028] Please refer to Figure 2 The top of the central tube 120 is connected to an input tube 150 that passes through the top of the sealing cover 130. The input tube 150 is fixed in the sealing cover 130 by means of threads. Two sets of discharge tubes 140 connected to the second chamber 170 are provided on the outer wall of the filter membrane core housing 100 near the upper and lower end surfaces.

[0029] The external water delivery pipe delivers the water to be filtered to the central tube 120 in the filter membrane core housing 100 one by one through the input pipe 150, and the water is filtered through the nanofiltration membrane cartridge 110 and finally discharged through the discharge pipe 140.

[0030] Please refer to Figure 5 and Figure 9 A positioning ring groove 121 is provided at the position where the curved outer wall of the center tube 120 contacts each group of base rings 210. Balls 123 are rolled on the upper and lower annular inner walls of the positioning ring groove 121. The number of balls 123 is multiple groups and distributed in an annular array. The upper and lower end faces of the positioning ring groove 121 are provided with concave ring grooves 211 adapted to the balls 123.

[0031] By providing the positioning ring groove 121, the base ring 210 can be stably sleeved on the outer wall of the central tube 120, constraining the central tube 120 so that the central tube 120 can rotate inside the base ring 210 under the action of water pressure; The rolling of the balls 123 can reduce the static friction coefficient between the upper and lower ends of the base ring 210 and the positioning ring groove 121, and can fully utilize the water pressure to rotate the center tube 120.

[0032] Please refer to Figure 5 A tapered hole 124 with a spiral trajectory is opened on the outer wall of the central tube 120 and in the area corresponding to each group of horn tubes 220.

[0033] The tapered hole 124 is used to ensure that the amount of water discharged from the center tube 120 is sufficient, thereby ensuring the efficiency of water filtration.

[0034] Please refer to Figure 10 The end face of the diverter cap 125 is fixed with a ring 127 rotatably connected to the tapered hole 124 . The curved inner wall of the tapered hole 124 is provided with a ring groove adapted to the ring 127 . The internal taper of the ring 127 is adapted to the tapered hole 124 .

[0035] The ring 127 and the groove cooperate with each other, so that the diverter cap 125 can rotate constantly at the end of the tapered hole 124, driving the water discharged from the tapered hole 124 to form a spiral trajectory.

[0036] During use, when the external water is transported to the interior of the central tube 120, since the internal aperture of the tapered hole 124 is smaller than the diameter of the central tube 120, the drainage volume of the tapered hole 124 will be smaller than the water intake volume of the central tube 120. At this time, the interior of the central tube 120 will be filled with water, and the tapered hole 124 will discharge water into the first chamber 160 in real time. Therefore, the water inside the central tube 120 flows from top to bottom, and the water will hit the fan blades 126 in the central tube 120. At this time, the central tube 120 will rotate inside the multiple groups of base rings 210, and the water discharged through the spirally arranged tapered hole 124 will be in the shape of a naked line vortex. The water will be sprayed onto the curved inner wall of the horn 220 and the arc-shaped spoiler 240. Since the first chamber 160 in the horn 220 is also filled with water, its The water in the first chamber 160 will generate resistance to the water just discharged from the tapered hole 124. Therefore, the water just discharged from the tapered hole 124 will bend its discharge trajectory downward due to the resistance, and will eventually contact the curved inner walls of the horn 220 and the arc-shaped spoiler 240. The water discharged from the tapered hole 124 will generate vertical and tangential forces with the horn 220 and the arc-shaped spoiler 240. The vertical impact force will cause some ions in the middle of the water (such as lead, cadmium, mercury, arsenic, etc.) to adhere thereto, and the tangential impact force will cause the water and ions to flow downward along the horn 220 and the arc-shaped spoiler 240 until they contact the L-shaped nanofiltration membrane 280, which blocks the ions and retains them in the storage tank 270, thereby preventing a large number of ions from contacting the inner wall of the nanofiltration membrane cartridge 110 and causing blockage. As the internal diameter of the water discharged from the tapered hole 124 changes, the frictional resistance of the water flow is reduced, making the flow velocity of the water more evenly distributed, reducing eddy currents and impulses. At the same time, the flow velocity of the water is accelerated locally, enhancing the flushing effect on ions attached to the inner wall of the tapered hole 124, thereby reducing the risk of ions attaching to and depositing in the tapered hole 124, and ensuring the discharge efficiency of the water inside the central tube 120. The water flowing into the tapered hole 124 is discharged through the main hole 129 formed on the end face of the diverter cap 125 and is discharged through the auxiliary hole 128 at the same time. The water discharged from the two sets of auxiliary holes 128 is in opposite directions and generates a thrust in opposite directions on the diverter cap 125, causing the diverter cap 125 to rotate at the end of the tapered hole 124. As a result, the water discharged from the main hole 129 is discharged in a spiral vortex shape, so that the water contacts the inner wall of the horn 220 and the curved surface of the arc-shaped spoiler 240 in an annular shape (generating vertical and tangential impact forces), causing a large number of ions in the water to adhere to the inner wall of the horn 220 and the curved spoiler 240, thereby increasing the total amount of ions retained in the inner wall of the horn 220 and the curved spoiler 240 and the storage tank 270, thereby indirectly extending the service life of the nanofiltration membrane cartridge 110. A drainage channel is formed between the outer wall of the arc-shaped spoiler 240 and the supporting mesh 180, through which the water inside the central tube 120 can flow downward, and through which ions flowing downward along the arc-shaped spoiler 240 can pass (the filtration condition of the nanofiltration membrane requires the use of a pressure difference, so the water will not only approach the nanofiltration membrane, but will also generate a tangential force due to the collision with the horn 220 and the arc-shaped spoiler 240, causing the water to surge downward). This will drive the water and ions to flow downward in a concentrated manner, thereby reducing the probability of adhesion to the curved inner wall of the nanofiltration membrane cartridge 110 and improving the filtration efficiency of the nanofiltration membrane cartridge 110; Since the inner tapers of each group of horns 220 distributed on the outer wall of the central tube 120 are different, the vertical and tangential forces generated by the water discharged from the conical hole 124 colliding with the horns 220 are different, and the total amount of ions attached to or retained on the inner walls of the horns 220 and the arc-shaped spoilers 240 will also decrease from top to bottom. Therefore, the total amount of ions attached to the outer wall of the nanofiltration membrane cartridge 110 increases as it moves toward the bottom, and the number of ions attached to the horns 220 and the arc-shaped spoilers 240 decreases as they move toward the top. In this way, the ions can be relatively evenly distributed in the upper and lower parts of the filter membrane core housing 100, and the water permeability of the nanofiltration membrane cartridge 110 can be ensured, thereby improving the filtration efficiency of the nanofiltration membrane and extending the service life.

[0037] Although an embodiment of the present invention has been shown and described, this specific embodiment is merely an explanation of the present invention and is not a limitation of the invention. The specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions and variations to the embodiment without creative contribution as needed without departing from the principles and purpose of the present invention. However, as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. An efficient sewage separation nanofiltration membrane device, comprising a membrane core housing (100), characterized in that: A central tube (120) is longitudinally rotatably connected to the center of the filter membrane core housing (100); a nanofiltration membrane cartridge (110) is sleeved on the outer side of the central tube (120) and located inside the filter membrane core housing (100); sealing caps (130) are threadedly connected to the upper and lower ends of the filter membrane core housing (100); and flow diversion components (200) are distributed on the outer wall of the central tube (120) at equal intervals along its length. The flow diversion component (200) includes a base ring (210) rotatably arranged on the outer wall of the central tube (120), a horn (220) is fixedly sleeved on the curved outer wall of the base ring (210), and the outer side of the horn (220) is provided with equidistant grooves (230) along the circular circumference thereof, and an arc-shaped spoiler (240) is fixed in each group of the horn grooves (230), and the bottom of the arc-shaped spoiler (240) is inclined toward the center of the base ring (210), and two groups of fins (260) are fixed on the curved inner wall of the horn (220) and near the edge positions of two adjacent groups of fins (230), and the two groups of fins (260) form a storage groove (270) on the inner wall of the horn (220), and an L-shaped nanofiltration membrane (280) is fixedly connected at the bottom position of the storage groove (270). Fan blades (126) are fixed inside the center tube (120) and near the upper and lower ends. The curved outer wall of the center tube (120) is provided with tapered holes (124) at equal intervals in a spiral shape. The tapered holes (124) are provided at a position where the outer wall of the center tube (120) is aligned with the horn (220). The outer wall of the center tube (120) is provided with a diverter cap (125) rotatably connected to the tapered hole (124). The end surface of the diverter cap (125) is symmetrically provided with two groups of main holes (129). The outer walls on both sides of the diverter cap (125) are provided with two groups of secondary holes (128) tangential to the inner wall of the diverter cap (125).

2. The efficient sewage separation nanofiltration membrane device according to claim 1, characterized in that: The outer wall of the central tube (120) and the nanofiltration membrane cartridge (110) form a first chamber (160), and the outer wall of the nanofiltration membrane cartridge (110) and the inner wall of the membrane core housing (100) form a second chamber (170). Support nets (180) are fixed on both the inner and outer sides of the nanofiltration membrane cartridge (110) in the first chamber (160) and the second chamber (170).

3. The efficient sewage separation nanofiltration membrane device according to claim 1, characterized in that: The inner walls of the end faces of the two groups of sealing covers (130) are fixed with receiving plates (122) in contact with the upper and lower ends of the central tube (120), the outer wall of the central tube (120) is fixed with an inner ring (190) in contact with the receiving plate (122), the outer wall of the inner ring (190) is sleeved with an outer ring cover (191) fixed to the end face of the receiving plate (122), and a plurality of first balls are provided at the contact position between the end face of the outer ring cover (191) and the inner ring (190).

4. The efficient sewage separation nanofiltration membrane device according to claim 2, characterized in that: The top of the central tube (120) is connected to an input tube (150) extending to the top of the sealing cover (130). The input tube (150) is fixed in the sealing cover (130) by means of a thread. Two sets of discharge tubes (140) connected to the second chamber (170) are provided on the outer wall of the filter element housing (100) near the upper and lower end surfaces.

5. The efficient sewage separation nanofiltration membrane device according to claim 1, characterized in that: A positioning ring groove (121) is provided at a position where the curved outer wall of the central tube (120) contacts each group of the base rings (210), and balls (123) are rolled on the upper and lower annular inner walls of the positioning ring groove (121). The balls (123) are provided in multiple groups and are distributed in an annular array. The upper and lower end surfaces of the positioning ring groove (121) are provided with concave ring grooves (211) adapted to the balls (123).

6. The efficient sewage separation nanofiltration membrane device according to claim 1, characterized in that: The outer wall of the central tube (120) and the area corresponding to each group of horn tubes (220) are provided with a conical hole (124) in a spiral trajectory.

7. The efficient sewage separation nanofiltration membrane device according to claim 1, characterized in that: The inclinations within the multiple groups of horn tubes (220) increase gradually from top to bottom along the length direction of the central tube (120).

8. The efficient sewage separation nanofiltration membrane device according to claim 1, characterized in that: A ring (127) rotatably connected to the tapered hole (124) is fixed to the end surface of the diverter cap (125); a ring groove adapted to the ring (127) is provided on the curved inner wall of the tapered hole (124); and the inner taper of the ring (127) is adapted to the tapered hole (124).

9. The efficient sewage separation nanofiltration membrane device according to claim 1, characterized in that: The outer wall of each group of horn tubes (220) is provided with a positioning piece (250) fixed to the inner wall of the supporting net enclosure (180) near the bottom, and a sewage discharge channel is formed between the outer wall of the arc-shaped spoiler (240) and the inner wall of the supporting net enclosure (180).

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