An ultrafiltration membrane module

Abstract

The application provides an ultrafiltration membrane assembly, which comprises an upper water collecting pipe, a lower water collecting pipe and a plurality of filter membrane filaments connected between the upper water collecting pipe and the lower water collecting pipe. The upper water collecting pipe comprises a first water collecting channel and a second water collecting channel, the first water collecting channel and the second water collecting channel are arranged in parallel, are connected through a communicating part at two ends of the upper water collecting pipe, and a first gas-liquid channel is formed between the first water collecting channel and the second water collecting channel. The lower water collecting pipe comprises a third water collecting channel and a fourth water collecting channel, the third water collecting channel and the fourth water collecting channel are arranged in parallel, are connected through a communicating part at two ends of the lower water collecting pipe, and a second gas-liquid channel is formed between the third water collecting channel and the fourth water collecting channel. The technical scheme avoids the problem that bubbles need to bypass the arc-shaped water collecting pipe in the traditional ultrafiltration membrane assembly, so that the bubbles can rise in a straight line along the gas-liquid channel and cannot change the flow direction due to the structure of the water collecting pipe, the bubbles can be ensured to fully contact all the filter membrane filaments, and the cleaning effect of the air-water backwashing is improved.

Description

Technical Field

[0001] This application relates to the field of water treatment technology, specifically to an ultrafiltration membrane module. Background Technology

[0002] Curtain filtration membrane technology is a highly efficient water treatment technology that purifies water through micropores on the membrane surface, effectively removing suspended particles, colloidal substances, bacteria, and other large organic molecules. During use, trapped substances gradually adhere to the inner surface of the membrane, leading to a decrease in water production. Therefore, regular air-water backwashing is necessary. During backwashing, compressed air bubbles in the water cause the membrane fibers to vibrate, while a backwash pump pressurizes purified water to backwash the membrane fibers from the inside out, thus removing contaminants from the membrane fiber surface. However, if... Figure 1 and Figure 2 As shown, in traditional curtain-type ultrafiltration membrane modules, the bottom of the water collection pipe is arc-shaped and relatively wide (approximately 50 mm). This type of curtain-type ultrafiltration membrane module causes rising air bubbles to be blocked by the arc-shaped water collection pipe, changing their flow direction and causing the bubbles to bypass the membrane fibers near the lower water collection pipe. This not only affects the spatial agitation effect of the bubbles on the dense membrane fibers, but also prevents the most heavily contaminated membrane fibers near the lower water collection pipe from being effectively scrubbed by the bubbles, thus reducing the cleaning effect. Summary of the Invention

[0003] The purpose of this application is to provide an ultrafiltration membrane module to solve the technical problems of uneven bubble distribution and unsatisfactory cleaning effect in traditional curtain-type ultrafiltration membrane modules during air-water backwashing.

[0004] An embodiment of this application provides an ultrafiltration membrane assembly, including an upper water collection pipe, a lower water collection pipe, and multiple filter membrane fibers connected between the upper and lower water collection pipes. The upper water collection pipe includes a first water collection channel and a second water collection channel, which are arranged in parallel and connected at both ends of the upper water collection pipe through a connecting portion, forming a first gas-liquid channel between the first and second water collection channels. The lower water collection pipe includes a third water collection channel and a fourth water collection channel, which are arranged in parallel and connected at both ends of the lower water collection pipe through a connecting portion, forming a second gas-liquid channel between the third and fourth water collection channels. The centerlines of the first and second gas-liquid channels are located in the same vertical plane. A bubble distributor is provided in the first and second gas-liquid channels, and the bubble distributor includes multiple distribution units, which are equally spaced along the length direction of the first and second gas-liquid channels.

[0005] In the above ultrafiltration membrane module, the connecting part between the first water collecting channel and the second water collecting channel and the connecting part between the third water collecting channel and the fourth water collecting channel are both circular arc parts.

[0006] In the above ultrafiltration membrane module, the bottom of the upper water collecting pipe and the top of the lower water collecting pipe are respectively provided with through holes for mounting filter membrane filaments, and the diameters of the through holes are matched with the outer diameters of the filter membrane filaments.

[0007] In the above ultrafiltration membrane module, each of the uniform distribution units comprises a distribution plate, a flow guide plate and a dirt collecting box, the distribution plate, the flow guide plate and the dirt collecting box are arranged in sequence along the airflow direction, the distribution plate is a rectangular plate, the outer peripheral edge of the distribution plate is attached to the inner wall of the gas-liquid channel, a plurality of through holes are formed in the distribution plate, the through holes are arranged in a matrix on the distribution plate, the distribution plate is divided into a middle region and two side regions along the width direction of the distribution plate, the cross-sectional area of the through holes in the middle region is greater than that of the through holes in the two side regions, the axis of the through holes is parallel to the center line of the gas-liquid channel, the upper end and the lower end of the distribution plate are respectively extended to form an upper fixed plate and a lower fixed plate, the upper fixed plate and the lower fixed plate are both rectangular plates, and are attached to the inner wall of the gas-liquid channel in parallel, threaded holes are formed in the upper fixed plate and the lower fixed plate, and the upper fixed plate and the lower fixed plate are fixed to the inner wall of the gas-liquid channel by fasteners.

[0008] In the above ultrafiltration membrane module, annular sealing rings are arranged between the upper fixed plate and the lower fixed plate and the inner wall of the gas-liquid channel, and the annular sealing rings are embedded in the annular grooves on the fixed plates.

[0009] In the above ultrafiltration membrane module, the flow guide plate is located on the upstream side of the distribution plate, and is in a V shape, the opening of the V shape faces downstream, the bottom of the V shape points to the upstream, the two side edges of the flow guide plate are fixedly connected to the two side inner walls of the gas-liquid channel, and a gap is left between the top of the flow guide plate and the lower edge of the distribution plate.

[0010] In the above ultrafiltration membrane module, the dirt collecting box is located on the downstream side of the distribution plate, and is in a V shape in cross section, the opening of the V shape faces upward, the two ends of the dirt collecting box are fixedly connected to the two side inner walls of the gas-liquid channel, and a gap is left between the upper edge of the dirt collecting box and the upper edge of the distribution plate.

[0011] In the above ultrafiltration membrane module, the bottom of the dirt collecting box is provided with a dirt discharging port, the dirt discharging port is communicated with the outside through a dirt discharging pipe, and a control valve is arranged on the dirt discharging pipe.

[0012] In the above ultrafiltration membrane module, the through holes on the distribution plate are arranged in multiple rows and multiple columns, the spacing between adjacent two rows of through holes is equal, and the spacing between adjacent two columns of through holes is equal.

[0013] In the above ultrafiltration membrane assembly, the spacing between any two adjacent ones of the plurality of uniform distribution units is equal.

[0014] In the ultrafiltration membrane assembly of the present application, the upper water collecting pipe comprises a first water collecting channel and a second water collecting channel arranged in parallel, and a first gas-liquid channel is formed between the two; the lower water collecting pipe comprises a third water collecting channel and a fourth water collecting channel arranged in parallel, and a second gas-liquid channel is formed between the two. The center lines of the first gas-liquid channel and the second gas-liquid channel are located in the same vertical plane, forming a straight channel for the rising of gas bubbles. By arranging two parallel water collecting channels between the upper and lower water collecting pipes, a gas-liquid channel is formed between the water collecting channels, avoiding the problem that in the traditional curtain type ultrafiltration membrane assembly, gas bubbles need to bypass the arc-shaped water collecting pipe. The gas bubbles can rise straight along the gas-liquid channel, and will not change direction due to the structure of the water collecting pipe, ensuring that the gas bubbles can fully contact all the filter membrane filaments.

[0015] In addition, since the center lines of the first gas-liquid channel and the second gas-liquid channel are located in the same vertical plane, a stable gas bubble rising channel is formed. This arrangement makes the motion trajectory of the gas bubbles more regular and less likely to deviate, thereby ensuring that the gas bubbles can be uniformly distributed in the space between the filter membrane filaments, improving the cleaning effect of the gas bubbles on the filter membrane filaments.

[0016] The above technical solution can make the gas bubbles uniformly act on all the filter membrane filaments, especially the filter membrane filaments close to the lower water collecting pipe, which can also be fully cleaned by the gas bubbles, avoiding the problem of insufficient cleaning of some filter membrane filaments in the traditional technical solution. This not only improves the cleaning efficiency, but also prolongs the service life of the filter membrane filaments and reduces the maintenance cost.

[0017] In summary, the ultrafiltration membrane assembly of the present application effectively solves the problem of uneven distribution of gas bubbles in the prior art, significantly improves the cleaning effect of gas-water backwashing, and realizes the overall improvement of the performance of the ultrafiltration membrane assembly. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a side view of a traditional curtain type ultrafiltration membrane assembly.

[0019] Figure 2 is a top view of a traditional curtain type ultrafiltration membrane assembly.

[0020] Figure 3 is a schematic view of an ultrafiltration membrane assembly provided by an embodiment of the present application.

[0021] Figure 4 is a side view of an ultrafiltration membrane assembly as shown in Figure 3 .

[0022] Figure 5 is a top view of an ultrafiltration membrane assembly as shown in Figure 3 . DETAILED DESCRIPTION

[0023] The specific embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0024] The terms "first", "second", and similar terms do not denote any order, quantity, or importance, but are used to distinguish different technical features. The term "multiple" and similar terms mean two or more, unless otherwise explicitly limited.

[0025] Embodiments of the present application can be combined with each other.

[0026] As shown in FIGS. Figure 3 , Figure 4 and Figure 5 The present embodiment provides an ultrafiltration membrane assembly, which includes an upper water collecting pipe 101, a lower water collecting pipe 103, and a plurality of filter membrane filaments 102 connected between the upper water collecting pipe 101 and the lower water collecting pipe 103.

[0027] The upper water collecting pipe 101 includes a first water collecting channel 1011 and a second water collecting channel 1012, which are arranged in parallel and have equal cross-sectional areas. The first water collecting channel 1011 and the second water collecting channel 1012 are connected at both ends of the upper water collecting pipe 101 through a communication part, and the cross-sectional area of the communication part is equal to that of the water collecting channel. A first gas-liquid channel 1013 is formed between the first water collecting channel 1011 and the second water collecting channel 1012, and the cross section of the first gas-liquid channel 1013 is rectangular.

[0028] The lower water collecting pipe 103 includes a third water collecting channel 1031 and a fourth water collecting channel 1032, which are arranged in parallel and have equal cross-sectional areas. The third water collecting channel 1031 and the fourth water collecting channel 1032 are connected at both ends of the lower water collecting pipe 103 through a communication part, and the cross-sectional area of the communication part is equal to that of the water collecting channel. A second gas-liquid channel 1033 is formed between the third water collecting channel 1031 and the fourth water collecting channel 1032, and the cross section of the second gas-liquid channel 1033 is rectangular.

[0029] The center lines of the first gas-liquid channel 1013 and the second gas-liquid channel 1033 are located in the same vertical plane. The connection between the first water collecting channel 1011 and the second water collecting channel 1012 and the connection between the third water collecting channel 1031 and the fourth water collecting channel 1032 are both circular arc parts.

[0030] The plurality of filter membrane filaments 102 are arranged vertically, and the spacing of the filter membrane filaments 102 is equal. The bottom of the upper water collecting pipe 101 and the top of the lower water collecting pipe 103 are respectively provided with through holes for mounting the filter membrane filaments 102, and the diameter of the through holes is matched with the outer diameter of the filter membrane filaments 102.

[0031] In the present embodiment, the compressed air 301 provided by the compressed air delivery pipe 201 enters the second gas-liquid passage 1033 from the air inlet at the bottom of the lower water collector 103. The bubbles of the compressed air 301 rise straight along the second gas-liquid passage 1033, and drive the filter membrane filaments 102 to shake. At the same time, the backwashing pump introduces purified water into the inside of the filter membrane filaments 102 through the water inlet at the top of the upper water collector 101, and the purified water penetrates from the inside of the filter membrane filaments 102 to the outside, so that the pollutants on the surface of the filter membrane filaments 102 fall off. The pollutants are discharged from the pollutant discharge port at the bottom of the lower water collector 103 together with the bubbles and the water flow.

[0032] Although the gas-liquid passage can make the bubbles fully contact the filter membrane filaments 102, in actual application, when a large air flow is required to enhance the cleaning effect, the gas-liquid passage cannot guarantee that the bubbles are uniformly distributed on the entire cross section of the gas-liquid passage, resulting in that the bubbles are too concentrated in some areas and sparse in some areas, affecting the uniformity of the cleaning effect.

[0033] In order to solve the above problems, a bubble uniform distributor is arranged in the first gas-liquid passage 1013 and the second gas-liquid passage 1033.

[0034] The bubble uniform distributor comprises a plurality of uniform distribution units, and the plurality of uniform distribution units are arranged at equal intervals along the length direction of the first gas-liquid passage and the second gas-liquid passage. Each uniform distribution unit comprises a distribution plate, a flow guide plate and a pollutant collecting box, and these components are arranged in sequence along the direction of the airflow.

[0035] The distribution plate is in the shape of a rectangular plate, and the outer peripheral edge thereof is attached to the inner wall of the gas-liquid passage. A plurality of through holes are formed in the distribution plate, and the through holes are arranged in a matrix on the distribution plate. The distribution plate is divided into three regions along the width direction thereof, i.e., a middle region and two side regions. The cross-sectional area of the through holes in the middle region is larger than that of the through holes in the two side regions. The axes of all the through holes are parallel to the center line of the gas-liquid passage. The through holes form a matrix of multiple rows and multiple columns on the distribution plate.

[0036] The upper end and the lower end of the distribution plate are respectively extended to form an upper fixed sheet and a lower fixed sheet. The upper fixed sheet and the lower fixed sheet are in the shape of rectangular sheets, and are attached to the inner wall of the gas-liquid passage in parallel. Threaded holes are formed in the upper fixed sheet and the lower fixed sheet. The upper fixed sheet and the lower fixed sheet are fixed to the inner wall of the gas-liquid passage by fasteners. An annular sealing ring is arranged between the upper fixed sheet and the lower fixed sheet and the inner wall of the gas-liquid passage, and the annular sealing ring is embedded in the annular groove on the fixed sheet.

[0037] The flow guide plate is located on the upstream side of the distribution plate, and is in the shape of a V, with the opening of the V facing downstream and the bottom of the V pointing upstream. The two side edges of the flow guide plate are fixedly connected to the two side inner walls of the gas-liquid passage. A gap is left between the top of the flow guide plate and the lower edge of the distribution plate. The surface of the flow guide plate is a smooth surface.

[0038] The collecting box is located on the downstream side of the distribution plate and has a V-shaped cross section with the opening of the V shape facing upward. The two ends of the collecting box are fixedly connected with the inner walls of the two sides of the gas-liquid passage. A gap is left between the upper edge of the collecting box and the upper edge of the distribution plate. The bottom of the collecting box is provided with a sewage outlet which is communicated with the outside through a sewage pipe. The sewage pipe is provided with a control valve.

[0039] In actual operation, when the bubbles rise from the lower part, they are first dispersed by the guide plates, flow along the inclined surfaces of the guide plates to the two sides, and cover the entire cross section of the distribution plate. Then the bubbles pass through the through holes on the distribution plate, and due to the different cross-sectional areas of the through holes in the middle and side areas, the bubbles are uniformly distributed in the cross section of the gas-liquid passage. After being dispersed step by step by multiple uniform distribution units, the bubbles are finally uniformly distributed in the entire gas-liquid passage. At the same time, the dirt falling off the surface of the filter membrane wire 102 is collected in the collecting box and discharged through the sewage outlet and the sewage pipe.

[0040] Through the above improvement, the bubble distributor solves the problem of uneven distribution of bubbles in the gas-liquid passage by the cooperation of the distribution plate, the guide plate and the collecting box. The zoned through holes of the distribution plate make the bubbles uniformly distributed, the guide plate makes the bubbles fully dispersed, and the collecting box prevents the distribution plate from being blocked, thereby improving the uniformity of the cleaning effect, prolonging the maintenance cycle of the equipment and improving the operation stability of the equipment.

[0041] The spacing between adjacent filter membrane wires 102 is small. In actual operation, if the raw water quality is poor and contains many large particles, these impurities may be stuck between the filter membrane wires 102 under high flow conditions, causing local blockage, reducing the filtration efficiency of the ultrafiltration membrane assembly, and even damaging the filter membrane wire 102.

[0042] In order to solve the above problems, a pre-filter is arranged at the water inlet end of the ultrafiltration membrane assembly.

[0043] The pre-filter includes a shell and a plurality of layers of filter members arranged in the shell. The shell includes an upper shell and a lower shell which are detachably connected by a quick connection member. The quick connection member includes an annular flange arranged on the outer periphery of the lower shell and a plurality of buckles arranged on the outer periphery of the upper shell, and the buckles are detachably buckled with the annular flange.

[0044] The shell is cylindrical, the water inlet end of which is connected with the water inlet pipe, and the water outlet end is connected with the water inlet of the ultrafiltration membrane assembly. The cross-sectional area of the shell is larger than that of the water inlet pipe, forming an expansion part.

[0045] The plurality of layers of filter members are arranged in sequence along the water flow direction, and a spacing is provided between adjacent filter members. Each layer of filter member includes a filter mesh body and a fixing ring. The filter mesh body is folded and has a cylindrical shape after folding. The fixing ring is arranged at both ends of the filter mesh body, and the outer periphery of the fixing ring is provided with a sealing ring which is in sealing contact with the inner wall of the shell.

[0046] Support rings are arranged between adjacent filter members, and the outer diameter of the support rings matches the inner diameter of the shell. A plurality of water passages are formed in the support rings and arranged in a ring array.

[0047] A flow guide is arranged at the water inlet end of the shell, and the flow guide comprises a plurality of flow guide pieces arranged in a radial pattern. One end of each flow guide piece is fixedly connected to the inner wall of the shell, and the other end points to the axis of the shell.

[0048] A flow straightening plate is arranged downstream of the last layer of filter members, and a plurality of water passages are formed in the flow straightening plate and arranged in a matrix pattern. The outer periphery of the flow straightening plate is fixedly connected to the inner wall of the shell.

[0049] A sewage outlet is arranged at the bottom of the shell, and a first control valve is arranged at the sewage outlet. An exhaust outlet is arranged at the top of the shell, and a second control valve is arranged at the exhaust outlet.

[0050] A first pressure detection port and a second pressure detection port are arranged at the water inlet end and the water outlet end of the shell respectively, and the first pressure detection port and the second pressure detection port are connected to a pressure sensor respectively.

[0051] In actual operation, the raw water is dispersed by the flow guide and then enters the shell, and then passes through the multiple layers of filter members in turn, and large-particle impurities are intercepted step by step. Since the filter screen body adopts a folding structure, it has a large filtering area and is not easy to be blocked as a whole. The support ring prevents the filter members from deforming, and the flow straightening plate makes the filtered water flow uniformly into the ultrafiltration membrane assembly.

[0052] Through the above improvements, the pre-filter can effectively intercept large-particle impurities in the raw water, prevent the impurities from blocking the gaps between the filter membrane filaments 102, protect the filter membrane filaments 102, improve the filtering efficiency, and prolong the service life of the ultrafiltration membrane assembly.

[0053] When the filter screen needs to be cleaned, first, close the water inlet valve and the water outlet valve, open the sewage valve and the exhaust valve, and discharge the water and gas in the shell. Then, loosen the buckle from the engagement with the annular flange, remove the upper shell, and take out the filter members for cleaning or replacement.

[0054] Through the above improvements, the pre-filter uses the step-by-step filtering of the multiple layers of filter members to prevent large-particle impurities from entering the ultrafiltration membrane assembly and avoid blockage between the filter membrane filaments 102. The split structure of the shell and the quick connection member facilitate maintenance and cleaning, and the pressure sensor can timely detect the blockage of the filter members, thereby improving the operation reliability of the equipment.

[0055] The inner surfaces of the first gas-liquid channel 1013 and the second gas-liquid channel 1033 are smooth surfaces. When the ultrafiltration membrane assembly vibrates or the water flow rate changes, the gas and liquid are easily separated, which causes the bubbles to be unable to stably contact the filter membrane filaments 102, thereby affecting the cleaning effect.

[0056] To solve the above problems, guide concave and convex surfaces are provided on the inner surfaces of the first gas-liquid channel 1013 and the second gas-liquid channel 1033.

[0057] The guide surface includes a first texture group and a second texture group. The first texture group extends along the length of the gas-liquid channel, and the second texture group extends along the circumference of the gas-liquid channel. The first and second texture groups intersect to form a grid.

[0058] The first texture group includes multiple parallel first grooves, with a first ridge forming between adjacent first grooves. The cross-section of the first groove is V-shaped, with the opening of the V-shape facing the center of the gas-liquid channel. The extension direction of the first groove is parallel to the rising direction of the bubble, so as to guide the bubble to move along a predetermined path.

[0059] The second texture group includes multiple parallel second grooves, with a second ridge forming between adjacent second grooves. The cross-section of the second groove is V-shaped, with the opening of the V-shape facing the center of the gas-liquid channel. The second groove is perpendicular to the first groove to increase the interfacial area of ​​gas-liquid contact, thereby making the interaction between gas and liquid more complete.

[0060] The intersection of the first and second grooves forms a cavity, the bottom surface of which is spherical. These cavities act as miniature gas storage chambers, helping to stabilize bubble movement. During bubble ascent, when encountering unstable factors, the gas stored in the cavity can provide support and stability. The intersection of the first and second convex ridges forms a boss, the top surface of which is arc-shaped. These bosses increase the turbulence between gas and liquid, effectively preventing gas-liquid stratification and allowing for more uniform mixing.

[0061] The guide surface forms repeating units on the inner surface of the gas-liquid channel. Each repeating unit includes four cavities, four bosses, a first groove, and a second groove. Multiple repeating units are evenly distributed along the circumference and axial direction of the gas-liquid channel.

[0062] Through the above-described improved structure, the guide concave-convex surface increases the gas-liquid contact area and stabilizes bubble movement. The concave cavity can store gas and provide gas replenishment when bubble movement is unstable; the protrusion can disturb the gas-liquid flow and prevent gas-liquid stratification; the first groove guides the bubbles to rise, and the second groove increases gas-liquid mixing, thereby improving the contact stability between the bubbles and the filter membrane filaments 102.

[0063] To further enhance the gas-liquid mixing effect, guide surfaces are provided on the sidewalls of the first and second grooves. These guide surfaces are arranged alternately along the length of the grooves, forming a serrated shape. Adjacent guide surfaces have opposite inclination directions. When bubbles pass through the guide surfaces, they generate a rotational motion, thereby enhancing the gas-liquid mixing effect, allowing the bubbles to come into more complete contact with the liquid, and improving the uniformity of the gas-liquid mixture.

[0064] The distribution density of the flow guide concave-convex surface is different at the turning of the gas-liquid channel. The pitch of the repeating units inside the turning is smaller than that outside the turning. This difference can compensate for the uneven distribution of bubbles at the turning due to centrifugal force and other factors, ensuring that the bubbles are also evenly distributed at the turning.

[0065] In actual operation, when the ultrafiltration membrane module vibrates or the water flow rate changes, the bubbles contact the flow guide concave-convex surface during their ascent. The grooves and bosses increase the gas-liquid contact area, making the movement of the bubbles more stable. The grid-like distribution prevents the bubbles from gathering or dispersing, maintaining the uniformity of the bubble distribution.

[0066] When the bubbles pass through the concave cavity, part of the gas remains in the concave cavity to form a gas reservoir. When the main gas flow is unstable, the gas reservoir releases bubbles, maintaining the continuity of the bubble distribution.

[0067] The guide surface causes the bubbles to rotate, preventing them from moving along a fixed path, allowing them to more fully contact various parts of the filter membrane filament 102 and improve the cleaning effect. The differentiated arrangement at the turning ensures uniform bubble distribution, avoiding uneven bubble distribution caused by centrifugal force.

[0068] This improvement solves the gas-liquid separation problem through the flow guide concave-convex surface, ensuring stable contact between the bubbles and the filter membrane filament 102. The flow guide concave-convex surface increases the friction and contact area between the gas and the liquid, allowing the bubbles to rise stably and fully contact the filter membrane filament 102. The combination of the concave cavity, bosses, and guide surface enhances the gas-liquid mixing effect and maintains the stability of the bubble distribution. The special distribution at the turning optimizes the uniformity of the bubble distribution, avoiding the impact of uneven local bubble distribution on the cleaning effect.

[0069] In actual operation, to effectively remove pollutants on the surface of the filter membrane filament 102, the backwash pump usually pressurizes the purified water to backwash from the inside to the outside of the filter membrane filament 102. When the backwash pressure is high, the filter membrane filament 102 may be damaged due to excessive pressure, reducing the service life and filtration performance of the ultrafiltration membrane module. For example, when dealing with highly polluted water, a higher backwash pressure is often required to achieve better cleaning results, significantly increasing the risk of damage to the filter membrane filament 102.

[0070] To solve the above problems, the structure of the filter membrane filament 102 is improved. The filter membrane filament 102 includes an inner support layer, a middle filtration layer, and an outer protective layer, which are sequentially wrapped.

[0071] The inner support layer is in a hollow tubular shape, and the inner wall thereof is smooth to reduce the resistance of water flow in the interior. The outer wall of the inner support layer is provided with protrusions arranged in a spiral shape along the axial direction. The spiral protrusions increase the contact area between the inner support layer and the middle filter layer, so that the combination therebetween is more compact. Meanwhile, the spiral protrusions can guide the reverse washing water flow to form a spiral motion, thereby enhancing the reverse washing effect. The cross section of the protrusions is semicircular, and the height of the protrusions remains consistent along the axial direction.

[0072] To further improve the compression resistance of the filter membrane wire 102, the inner wall of the inner support layer is provided with reinforcing portions including a plurality of annular reinforcing ribs. The annular reinforcing ribs are distributed at equal intervals along the axial direction, and the cross section of each annular reinforcing rib is triangular. The base of the triangle is fixedly connected to the inner wall of the inner support layer, and the vertex of the triangle points to the central axis of the inner support layer. The triangular cross section structure has good stability and can uniformly bear the radial pressure, thereby preventing local deformation of the membrane wire under high pressure during reverse washing.

[0073] The middle filter layer is wrapped on the outer surface of the inner support layer and tightly adheres to the protrusions of the inner support layer, so that delamination does not occur under the action of reverse washing pressure. The middle filter layer is provided with through holes arranged in a mesh shape to effectively filter impurities in water.

[0074] The outer protective layer is wrapped on the outer surface of the middle filter layer. The outer protective layer includes a first reinforcing rib group and a second reinforcing rib group. The first reinforcing rib group extends along the axial direction, and the second reinforcing rib group extends along the circumferential direction. The first reinforcing rib group and the second reinforcing rib group are interlaced to form a mesh, and the openings of the mesh expose the middle filter layer, thereby ensuring the protection of the middle filter layer by the outer protective layer and not affecting the filtering function of the middle filter layer.

[0075] The intersection of the first reinforcing rib group and the second reinforcing rib group is provided with reinforcing nodes. The reinforcing nodes are in the shape of a circular truncated cone, and the large end of the circular truncated cone is connected to the reinforcing rib. Adjacent reinforcing nodes are connected by the reinforcing rib to form an overall mesh structure. The thickness of the reinforcing node is greater than that of the reinforcing rib. This design significantly increases the overall strength of the filter membrane wire 102, so that it can withstand higher reverse washing pressure.

[0076] The surface of the outer protective layer is provided with flow guide grooves. The flow guide grooves are arranged in a spiral shape along the axial direction, and the spiral direction of the flow guide grooves is opposite to that of the protrusions of the inner support layer, so as to form a complex vortex field during reverse washing, thereby enhancing the cleaning effect and dispersing the local pressure to avoid damage to the membrane wire caused by excessively high local pressure. The cross section of the flow guide grooves is arc-shaped, and the opening of the arc-shaped flow guide grooves faces outward.

[0077] The two ends of the filter membrane wire 102 are provided with reinforced sections, and the length of the reinforced section accounts for one tenth of the total length of the membrane wire. In the reinforced section, the wall thickness of the inner support layer gradually increases from the middle to the end, and the mesh spacing of the outer protective layer gradually decreases from the middle to the end, forming a gradient structure. This avoids damage caused by stress concentration at both ends of the membrane wire, and improves the strength of the filter membrane wire 102 at the connection with the water collection channel.

[0078] In order to prevent the filter membrane wire 102 from being twisted and deformed during backwashing, the first and second reinforcing rib groups adopt an interlaced weaving structure. The adjacent first reinforcing ribs are connected by the second reinforcing ribs to form a three-dimensional network structure. In the interlaced weaving structure, the intersection of the first reinforcing rib and the second reinforcing rib is provided with a reinforcing node. This interlaced weaving structure provides good torsional resistance, so that the filter membrane wire 102 can maintain a stable form during high-pressure backwashing.

[0079] In actual operation, when the backwashing pressure acts on the inner wall of the inner support layer, the annular reinforcing rib bears the radial pressure to prevent local deformation of the membrane wire. The spiral protrusions of the inner support layer are closely matched with the intermediate filter layer to guide the water flow to form a spiral motion, thereby improving the backwashing efficiency. The mesh structure of the outer protective layer and the flow guide groove cooperate to form a complex flow field, thereby enhancing the cleaning effect. The gradient structure and the interlaced weaving structure of the reinforced section provide overall support, so that the filter membrane wire 102 remains stable during high-pressure backwashing.

[0080] The intermediate filter layer is closely attached to the inner support layer and will not delaminate under the action of backwashing pressure, thereby ensuring the stability of the filtration function. The mesh structure of the outer protective layer supports the intermediate filter layer to prevent excessive expansion of the intermediate filter layer.

[0081] The spiral flow guide grooves on the surface of the outer protective layer are arranged in the opposite direction to the spiral protrusions of the inner support layer, so that the backwashing water flow forms a vortex when passing through the membrane wire, thereby enhancing the cleaning effect and dispersing the local pressure, effectively protecting the filter membrane wire 102.

[0082] The reinforced sections at both ends are designed with a gradient structure to avoid stress concentration and improve the strength of the filter membrane wire 102 at the connection. At the same time, the interlaced reinforcing rib structure provides good torsional resistance, so that the filter membrane wire 102 remains stable during high-pressure backwashing and is not prone to twisting and deformation.

[0083] This improvement significantly improves the mechanical strength of the filter membrane wire 102, enabling it to withstand higher backwashing pressure without breaking. The annular reinforcing ribs and spiral protrusions of the inner support layer, the close fit of the intermediate filter layer with the inner support layer, the mesh structure, reinforcing nodes, and spiral flow guide grooves of the outer protective layer, as well as the reinforcing segments and staggered weaving structure, work together to ensure the stability and reliability of the filter membrane wire 102 under high-pressure backwashing. Under the premise of maintaining good filtration performance, the service life of the filter membrane wire 102 is greatly extended, reducing the replacement cost and equipment downtime caused by the breakage of the filter membrane wire 102, improving the overall operating efficiency and economy of the ultrafiltration membrane module, and ensuring the stable operation of the ultrafiltration membrane module in high-pressure backwashing scenarios such as treating highly polluted water.

[0084] During actual operation, when the compressed air 301 flow is unstable or the ultrafiltration membrane module stops running, water accumulation may occur in the first gas-liquid channel 1013 and the second gas-liquid channel 1033. The accumulated water occupies the space of the gas-liquid channel, affecting the subsequent flow of compressed air 301, and thus affecting the shaking cleaning effect of the filter membrane wire 102 by the gas bubbles, reducing the overall cleaning efficiency of the ultrafiltration membrane module.

[0085] To solve the above problems, a water drain is arranged at the bottom of the first gas-liquid channel 1013 and the second gas-liquid channel 1033.

[0086] The water drain includes a water collection chamber, a drain pipe, and a control valve group. The water collection chamber is arranged at the lowest part of the gas-liquid channel and has a funnel shape, with the upper part communicating with the gas-liquid channel and the lower part connected with the drain pipe. The inner wall of the water collection chamber is provided with a spiral guide groove, which can guide the accumulated water to flow downward along the spiral path, effectively preventing backflow of the accumulated water. The top of the water collection chamber and the inner wall of the gas-liquid channel form a circular arc transition part, avoiding vortex and ensuring that the accumulated water can flow smoothly into the water collection chamber.

[0087] The drain pipe includes a main pipe and a branch pipe. The main pipe is vertically arranged, with the upper end connected with the bottom of the water collection chamber and the lower end extending to the outside of the ultrafiltration membrane module. The branch pipe is horizontally arranged and intersects with the main pipe, used for installing the control valve group.

[0088] The control valve group includes a valve body, a valve core, and a driving part. The valve body is arranged at the intersection of the main pipe and the branch pipe, and the valve core reciprocates in the valve body. The valve core includes a main valve core and a secondary valve core, with the main valve core used for controlling drainage and the secondary valve core used for preventing gas backflow.

[0089] A liquid level meter is arranged in the water collection chamber, including a float and a guide rod. The float moves up and down along the guide rod, and the guide rod is fixed to the inner wall of the water collection chamber. The position change of the float is transmitted to the control valve group through a connecting rod.

[0090] To prevent gas leakage during drainage, the drain is provided with a sealing member. The sealing member includes a first sealing ring and a second sealing ring. The first sealing ring is arranged between the main valve core and the valve body, and the second sealing ring is arranged between the auxiliary valve core and the valve body. The first sealing ring moves with the main valve core, and the second sealing ring is fixed in the valve body.

[0091] A noise reducer is arranged at the outlet of the main pipe. The noise reducer includes a shell and a plurality of baffles arranged in the shell. The baffles are arranged in a labyrinth shape to form a zigzag channel to reduce the noise generated during drainage. The shell is connected to the main pipe by threads.

[0092] An observation window is arranged in the middle of the main pipe. The observation window is embedded in the side wall of the main pipe and is provided with a sealing ring between the main pipe. The sealing ring is arranged in an annular groove.

[0093] In actual operation, when water accumulates in the gas-liquid channel, the water first enters the water collection cavity and flows downward along the spiral guide groove. When the water reaches the set position, the float rises and drives the main valve core to move downward through the connecting rod, opening the drainage channel, and the water is discharged under the action of gravity. The auxiliary valve core remains closed to prevent gas leakage from the drainage channel.

[0094] The sealing member ensures the air tightness of the system, and even in high pressure state, there is no gas leakage. After the water is discharged, the float drops, the main valve core closes, and the drainage cycle is completed.

[0095] This improved structure realizes automatic drainage of water accumulation in the gas-liquid channel through the cooperation of the water collection cavity and the sealing member, while avoiding gas leakage. The spiral guide groove of the water collection cavity guides the orderly flow of water, preventing backflow and turbulence, improving drainage efficiency and stability. The liquid level meter cooperates with the control valve group to realize automatic drainage without manual intervention, reducing labor costs and water accumulation problems caused by human operation.

[0096] In high altitude areas, atmospheric pressure is low, and the rising speed and distribution of bubbles are affected after compressed air 301 enters the gas-liquid channel. Due to the decrease in air density, the bubbles cannot provide enough power to drive the filter membrane wire 102 to vibrate during the rising process, resulting in poor cleaning effect and affecting the operation efficiency of the ultrafiltration membrane assembly.

[0097] To solve the above problems, an air booster is arranged on the air inlet pipeline (the pipeline before the compressed air 301 enters the gas-liquid channel). The air booster includes a booster member, a pressure stabilizing member and an adjusting member, which are connected by flanges.

[0098] The booster member includes a shell and a booster arranged in the shell. The shell is cylindrical, and its air inlet end is connected to an external air source, and its air outlet end is connected to the pressure stabilizing member.

[0099] The booster comprises a power component and a transmission component. The power component is fixed on the support seat at the bottom of the shell and connected with the transmission component through a shaft coupling. The transmission component comprises a driving shaft and a driven shaft, and the driving shaft and the driven shaft are connected through a synchronous belt transmission. A guide rail is arranged on the inner wall of the shell and extends along the axial direction of the shell. The booster component is in sliding fit with the guide rail through a sliding block, so as to ensure the stability of the movement during the boosting process and make the boosting operation more stable and reliable.

[0100] The pressure stabilizing component comprises a gas storage tank and a plurality of interfaces arranged on the gas storage tank. The gas storage tank is in a horizontal cylindrical shape, and the two ends thereof are provided with elliptical heads to improve the pressure bearing capacity of the gas storage tank. The gas inlet of the gas storage tank is connected with the gas outlet of the booster component, and the gas outlet is connected with the adjusting component.

[0101] A safety valve and a pressure gauge interface are arranged on the top of the gas storage tank. The safety valve is used for automatic pressure relief when the pressure in the gas storage tank is too high, so as to ensure the safety of the system. The pressure gauge interface can be connected with a pressure gauge to monitor the pressure in the gas storage tank in real time. A blowdown valve is arranged at the bottom of the gas storage tank to facilitate the discharge of impurities and moisture accumulated in the gas storage tank. A plurality of guide plates are arranged in the gas storage tank, and the guide plates are in a wave shape to slow down the airflow speed and make the pressure distribution more uniform, so as to ensure the stability of the gas pressure entering the adjusting component.

[0102] The adjusting component comprises a valve body and an adjusting mechanism arranged in the valve body. The valve body is in a Y shape, one end of which is connected with the gas storage tank, and the other end is divided into two branches, which respectively lead to the first gas-liquid passage 1013 and the second gas-liquid passage 1033.

[0103] The adjusting mechanism comprises a main valve core and a secondary valve core. The main valve core is used for controlling the total flow, and the secondary valve core is used for controlling the flow distribution of the two branches. The main valve core and the secondary valve core are both in a conical structure and are precisely adjusted through a screw rod mechanism. In this way, the gas flow entering the two gas-liquid passages can be accurately adjusted according to actual needs, so as to ensure uniform distribution of gas bubbles.

[0104] A buffer chamber is arranged at the outlet of the adjusting component, and a plurality of rectifying mesh plates are arranged in the buffer chamber. The rectifying mesh plates are in a honeycomb shape to eliminate the turbulence of the airflow, so as to make the gas bubble distribution more uniform and further optimize the state of the gas entering the gas-liquid passage.

[0105] In order to realize automatic control, the ultrafiltration membrane assembly further comprises a pressure sensor arranged at the inlet and outlet of the booster component, a liquid level sensor arranged on the gas storage tank, a flow sensor arranged on the adjusting component, etc. These sensors are electrically connected with the controller, and the controller automatically adjusts the operating parameters of the system according to the signals of the sensors. For example, when the outlet pressure is detected to be insufficient, the controller will automatically increase the operating power of the booster component; when the liquid level in the gas storage tank is too high, the controller will issue an alarm or control the relevant equipment to perform drainage and other operations.

[0106] In actual operation, the external gas source first enters the pressurizing member, and the pressurized gas enters the gas storage tank for temporary storage. The guide plates in the gas storage tank are used to reduce the gas flow speed and make the pressure distribution uniform. When the gas flows out of the gas storage tank, it is precisely adjusted by the adjusting member and enters the two gas-liquid channels respectively. The adjusting member is used to adjust the total flow and the distribution ratio according to the actual demand, so as to ensure the uniform distribution of gas bubbles in the two gas-liquid channels. The flow-regulating mesh plate of the buffer cavity further optimizes the gas flow state, so that the gas bubbles entering the gas-liquid channel are uniform in size and stable in distribution. This multi-stage processing method ensures that even in high-altitude environments, the gas bubbles can still provide sufficient power to drive the filter membrane filaments 102 to vibrate.

[0107] This improvement effectively solves the problem of reduced operation efficiency in high-altitude areas through the synergistic effect of pressurization, pressure stabilization, adjustment, and other links. The pressurizing member increases the pressure of the compressed air 301 entering the gas-liquid channel, making up for the low atmospheric pressure in high-altitude areas and ensuring that the gas bubbles have sufficient power to drive the filter membrane filaments 102 to vibrate. The pressure stabilizing member stabilizes the gas pressure through the gas storage tank and guide plates, providing a stable gas source for the adjusting member and ensuring the stability of the entire system operation. The adjusting member can accurately control the gas flow and distribution ratio, making the gas bubbles uniformly distributed in the two gas-liquid channels and improving the cleaning effect. The buffer cavity and the flow-regulating mesh plate further optimize the gas flow state, ensuring that the gas bubbles enter the gas-liquid channel stably and uniformly. Through these improvements, the ultrafiltration membrane assembly can maintain stable operation in different altitude environments, expand its application range, improve its work efficiency and reliability in high-altitude areas, and ensure that the ultrafiltration membrane assembly can operate efficiently in various complex environments.

[0108] In the ultrafiltration membrane assembly of the present application, the upper water collecting pipe 101 includes a first water collecting channel 1011 and a second water collecting channel 1012 arranged in parallel, and a first gas-liquid channel 1013 is formed between the two; the lower water collecting pipe 103 includes a third water collecting channel 1031 and a fourth water collecting channel 1032 arranged in parallel, and a second gas-liquid channel 1033 is formed between the two. The center lines of the first gas-liquid channel 1013 and the second gas-liquid channel 1033 are located in the same vertical plane, forming a straight channel for the gas bubbles to rise. By arranging two parallel water collecting channels between the upper and lower water collecting pipes 103, a gas-liquid channel is formed between the water collecting channels, avoiding the problem that in traditional curtain-type ultrafiltration membrane assemblies, gas bubbles need to bypass the arc-shaped water collecting pipe. The gas bubbles can rise straight along the gas-liquid channel and will not change direction due to the structure of the water collecting pipe, ensuring that the gas bubbles make full contact with all the filter membrane filaments 102.

[0109] In addition, since the center lines of the first gas-liquid passage 1013 and the second gas-liquid passage 1033 are located in the same vertical plane, a stable bubble rising channel is formed. This arrangement makes the movement trajectory of the bubbles more regular and avoids deviation, thereby ensuring that the bubbles can be uniformly distributed in the space between the filter membrane filaments 102 and improving the cleaning effect of the bubbles on the filter membrane filaments 102.

[0110] The above technical solution can make the bubbles uniformly act on all filter membrane filaments 102, and especially for the filter membrane filaments 102 close to the lower water collector 103, sufficient bubble cleaning can also be achieved, avoiding the problem of insufficient cleaning of part of the filter membrane filaments 102 in the conventional technical solution. This not only improves the cleaning efficiency, but also prolongs the service life of the filter membrane filaments 102 and reduces the maintenance cost.

[0111] In summary, the ultrafiltration membrane assembly of the present application effectively solves the problem of uneven distribution of bubbles in the conventional technology, significantly improves the cleaning effect of the gas-water backwashing, and realizes the overall improvement of the performance of the ultrafiltration membrane assembly.

[0112] The above describes the embodiments of the present application in detail, and the content of the specification should not be understood as limiting the protection scope of the present application.

Claims

1. An ultrafiltration membrane module, comprising an upper water collection pipe, a lower water collection pipe, and a plurality of filter membrane fibers connected between the upper water collection pipe and the lower water collection pipe, characterized in that, The upper water collection pipe includes a first water collection channel and a second water collection channel, which are arranged in parallel. The first water collection channel and the second water collection channel are connected at both ends of the upper water collection pipe through a connecting part, forming a first gas-liquid channel between the first water collection channel and the second water collection channel. The lower water collection pipe includes a third water collection channel and a fourth water collection channel, which are arranged in parallel. The third water collection channel and the fourth water collection channel are connected at both ends of the lower water collection pipe through a connecting part, forming a second gas-liquid channel between the third water collection channel and the fourth water collection channel. The center lines of the first gas-liquid channel and the second gas-liquid channel are located in the same vertical plane. A bubble distributor is provided in the first gas-liquid channel and the second gas-liquid channel. The bubble distributor includes multiple distribution units, which are equally spaced along the length direction of the first gas-liquid channel and the second gas-liquid channel. Each of the uniformly distributed units includes a distribution plate, a guide plate, and a sludge collection box. The distribution plate, the guide plate, and the sludge collection box are arranged sequentially along the airflow direction. The distribution plate is rectangular, and its outer periphery is attached to the inner wall of the gas-liquid channel. The gas-liquid channel is the first gas-liquid channel and the second gas-liquid channel. The distribution plate has multiple through holes arranged in a matrix. The distribution plate is divided into a middle region and two side regions along its width. The cross-sectional area of ​​the through holes in the middle region is larger than that in the two side regions. The axis of the through holes is parallel to the center line of the gas-liquid channel. The upper and lower ends of the distribution plate extend to form an upper fixing plate and a lower fixing plate, respectively. The upper fixing plate and the lower fixing plate are both rectangular and are attached to the inner wall of the gas-liquid channel. The upper fixing plate and the lower fixing plate each have threaded holes. The upper fixing plate and the lower fixing plate are fixed to the inner wall of the gas-liquid channel by fasteners.

2. The ultrafiltration membrane module according to claim 1, characterized in that, The connections between the first water collection channel and the second water collection channel, and between the third water collection channel and the fourth water collection channel, are all arc-shaped portions.

3. The ultrafiltration membrane module according to claim 1, characterized in that, The bottom of the upper water collection pipe and the top of the lower water collection pipe are respectively provided with through holes for installing filter membrane fibers, and the diameter of the through holes is adapted to the outer diameter of the filter membrane fibers.

4. The ultrafiltration membrane module according to claim 1, characterized in that, An annular sealing ring is provided between the upper fixing plate and the lower fixing plate and the inner wall of the gas-liquid channel, and the annular sealing ring is embedded in the annular groove on the upper fixing plate and the lower fixing plate.

5. The ultrafiltration membrane module according to claim 1, characterized in that, The guide plate is located upstream of the distribution plate and is V-shaped, with the opening of the V-shape facing downstream and the bottom of the V-shape pointing upstream. The two sides of the guide plate are fixedly connected to the inner walls of the gas-liquid channel on both sides, and a gap is left between the top of the guide plate and the lower edge of the distribution plate.

6. The ultrafiltration membrane module according to claim 1, characterized in that, The sludge collection box is located downstream of the distribution plate, and has a V-shaped cross-section with the opening of the V-shape facing upwards. Both ends of the sludge collection box are fixedly connected to the inner walls of the gas-liquid channel on both sides, and a gap is left between the upper edge of the sludge collection box and the upper edge of the distribution plate.

7. The ultrafiltration membrane module according to claim 6, characterized in that, The bottom of the sludge collection box is provided with a sludge outlet, which is connected to the outside through a sludge pipe, and a control valve is provided on the sludge pipe.

8. The ultrafiltration membrane module according to claim 1, characterized in that, The through holes on the distribution plate are arranged in multiple rows and columns, with equal spacing between adjacent rows and columns.

9. The ultrafiltration membrane module according to claim 1, characterized in that, The spacing between any two adjacent uniformly distributed units in the plurality of uniformly distributed units is equal.

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