Filter element assembly and filter comprising same

Abstract

The invention discloses a filter element assembly and a filter comprising the same. The filter element assembly comprises a central pipe and a plurality of membranes, the central pipe comprises an inner central pipe, an outer central pipe and a water inlet central pipe which are sequentially and coaxially arranged from inside to outside, and inner cavities of the inner central pipe and the water inlet central pipe are respectively provided with a first raw water channel and a second raw water channel which are used for forming raw water to flow; and a purified water channel for purified water to flow is formed between the inner wall surface of the outer central pipe and the outer wall surface of the inner central pipe. Raw water can flow downwards to the open bottom end through the open top end of the inner center pipe, then enters the open bottom end of the water inlet center pipe and can also directly enter the water inlet center pipe from the open top end of the water inlet center pipe, water can enter the water inlet center pipe from the two ends, the problem of dead angles in the water inlet process does not exist, and the filtering effect of the membrane can be improved; and the raised lines are arranged in the water inlet central pipe, so that the water flow in the water inlet central pipe is more disordered, and the filtering effect of the membrane can also be improved.

Description

Technical Field

[0001] The invention relates to the technical field of filtration, and in particular to a filter element component and a filter comprising the same. Background Art

[0002] The existing filter membrane assembly adopts the method of water inlet from the upper and lower end faces, and its overall water inlet end area is small and easy to be blocked by dirt. In order to limit the water inlet area, the two end faces of the membrane need to be partially sealed, and the sealing effect cannot be guaranteed, which easily leads to unqualified desalination rate or insufficient flow and easy blockage. In addition, the membrane after rolling cannot be evenly distributed on the central tube, resulting in unstable performance of the filter membrane assembly.

[0003] In order to solve the problem of pollution and blockage, some filter membrane components introduce raw water from the upper and lower ends at the same time. Although the water flow can enter stably, it will cause the raw water on the surface of the membrane to turn and rush, forming a vortex dead zone, making local pollution more serious.

[0004] The existing filtration components have problems with the filtration water path: the disadvantages of the end-flow membrane are that the water path is too short, the filtration efficiency is low, and the flow rate is slow. Problems with the membrane rolling process: ① The problem of uniformity of membrane stacking: Ideally, the membrane stacking requires uniform spacing between the membrane sheets so that the membrane sheets are evenly distributed on the central tube after the membrane is rolled, but in reality, whether it is automatic or semi-automatic membrane rolling, it is impossible to achieve uniform distribution, resulting in unstable performance of the membrane element; ② The problem of membrane utilization: Conventional end-flow membranes and conventional side-flow membranes need to inlet water through both end faces, so the two end faces must be flat to ensure that the water flow can enter stably and reduce the risk of fouling. Therefore, in the film rolling process, the amount of glue must be sufficient to ensure that the glue line has enough spread width, and there must be a cutting and peeling process to ensure that the two end faces are flat, but these process methods have problems such as material waste and processing time waste; ③ The problem of end face processing qualification rate: Conventional lateral flow membranes require local sealing of both end faces, but conventional glue sealing or plastic sealing cannot guarantee 100% reliable sealing. Some leaks lead to unqualified desalination rate, and some overflows lead to too small water inlet surface of the membrane element, and insufficient flow is more prone to fouling. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the defects in the prior art that raw water is introduced simultaneously from the upper and lower end faces of the filter membrane assembly, which is prone to deflection, hedging and contamination and clogging on the membrane surface, and provide a filter element assembly and a filter containing the same.

[0006] The present invention solves the above technical problems through the following technical solutions:

[0007] The present invention provides a filter element assembly, which includes a central tube and a plurality of membranes;

[0008] The central tube comprises an inner central tube, an outer central tube and a water inlet central tube which are coaxially arranged in sequence from the inside to the outside. Both the inner central tube and the water inlet central tube are structures with openings at both ends. The inner cavities of the inner central tube and the water inlet central tube are respectively provided with a first raw water channel and a second raw water channel for forming raw water flow. The first raw water channel and the second raw water channel are connected with the open bottom end of the water inlet central tube through the open bottom end of the inner central tube.

[0009] The water inlet central tube is attached to the outer wall surface of the outer central tube; a plurality of channels for enriching clean water are provided on the side wall of the outer central tube, and a clean water channel for clean water to flow is formed between the inner wall surface of the outer central tube and the outer wall surface of the inner central tube; the clean water channel has one end close to the open bottom end of the inner central tube closed and one end away from the open bottom end of the inner central tube open;

[0010] A plurality of raw water outlets are provided on the side wall of the water inlet central tube away from the outer central tube, and the plurality of raw water outlets are arranged along the axial direction of the water inlet central tube; a plurality of convex strips are evenly provided on the inner wall surface of the water inlet central tube along the axial direction;

[0011] The outer central tube is in a polygonal structure, and the water inlet central tube includes a plurality of independent water inlet central tube units correspondingly arranged along each side of the polygonal structure, and the water inlet central tube units contact the surface of the outer central tube and fit with the outer wall of the outer central tube;

[0012] Each of the membrane sheets is folded and wound around one of the water inlet central tube units; the sides of the adjacent membrane sheets in the length direction are sealed and connected to each other and wound around the central tube in the same direction to form a filter membrane assembly;

[0013] The filter element assembly further includes a filter element top cover and a filter element bottom cover, wherein the filter element bottom cover is arranged on a side close to the open bottom end of the inner central tube to connect the open bottom end of the inner central tube with the open bottom end of the water inlet central tube;

[0014] The bottom cover of the filter element is an open structure at one end, and the opening is arranged toward the filter membrane assembly; the top cover of the filter element is provided with a center hole, and the center tube is clamped in the center hole.

[0015] Preferably, the filter element top cover and the filter element bottom cover are both provided with a plurality of water guide grooves, and each of the water guide grooves is inserted into the water inlet central tube toward one end of the filter membrane assembly;

[0016] The end of the water guide groove on the filter element top cover away from the filter membrane assembly is configured to be able to communicate with external raw water to communicate with the second raw water channel;

[0017] One end of the water guide groove on the bottom cover of the filter element away from the filter membrane assembly is sealed and connected to the inner cavity of the inner central tube to connect to the first raw water channel;

[0018] Preferably, the surface of the water inlet central tube unit contacting the outer central tube is provided with a fitting for clamping with the outer central tube, two fittings are provided and clamped at two ends of the outer central tube respectively, and the diaphragm is located between the two fittings.

[0019] Preferably, an end plate is provided at one end of the outer central tube close to the open bottom end of the inner central tube, and the end plate is sealedly connected to the tube wall of the outer central tube;

[0020] A limiting hole is provided at the center of the end plate, and the inner center pipe is clamped in the limiting hole and is sealed and connected to the end plate.

[0021] In this solution, the sealing between the outer central tube and the inner central tube can be achieved by setting the end plate, thereby realizing the diversion of clean water and raw water.

[0022] Preferably, a concentrated water channel is formed between the inner side surfaces of each of the diaphragms, and a grid is provided between the inner side surfaces of each of the diaphragms;

[0023] And / or, the space between the outer sides of adjacent membranes forms a clean water channel, and an intermediate guide cloth is provided between the outer sides of adjacent membranes.

[0024] Preferably, the water inlet central tube unit is an arc-shaped tube formed by connecting a plate-like structure and an arc structure, and the surface of the plate-like structure is in contact with the outer wall of the outer central tube; the raw water outlet is located on the arc structure, and a long strip-shaped through hole is opened on the plate-like structure, and the convex strip is clamped in the through hole.

[0025] Preferably, the surface of the filter element top cover opposite to the diaphragm and the surface of the filter element bottom cover opposite to the diaphragm are both coated with sealant.

[0026] The present invention also provides a filter, which comprises a housing and the filter element assembly as described above, wherein the housing comprises a housing body with an opening at one end and an end cover arranged at the open end of the housing body.

[0027] Preferably, the end cover is provided with a first raw water inlet, a second raw water inlet and a clean water inlet;

[0028] The first raw water inlet is sealedly connected to the inner cavity of the inner central tube to connect to the first raw water channel;

[0029] The second raw water inlet is sealedly connected to the inner cavity of the water inlet central pipe to connect to the second raw water channel;

[0030] The clean water port is sealed and connected to the inner cavity of the outer central tube to connect to the clean water channel.

[0031] Preferably, a concentrated water channel for the concentrated water produced by the filter membrane assembly to flow is formed between the outer surface of the filter element top cover, the outer surface of the filter membrane assembly and the inner side wall of the shell body, and a concentrated water port is also provided on the end cover, and the concentrated water port is connected to the concentrated water channel.

[0032] The positive and progressive effects of the present invention are: the raw water of the present invention can flow downward through the open top of the inner center tube to the open bottom end, and then enter the open bottom end of the water inlet center tube, and can also directly enter from the open top of the water inlet center tube, thereby achieving water inlet from both ends of the water inlet center tube, so that there is no dead corner problem in the water inlet process, and the filtering effect of the membrane can be improved; the convex strips arranged in the water inlet center tube make the water flow in the water inlet center tube more chaotic, and can also improve the filtering effect of the membrane. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the cross-sectional structure of the filter of the present invention.

[0034] Figure 2 for Figure 1 A magnified schematic diagram of center A.

[0035] Figure 3 It is a schematic diagram of the three-dimensional structure of the filter of the present invention.

[0036] Figure 4 It is a schematic diagram of the three-dimensional structure of the filter element assembly of the present invention.

[0037] Figure 5 It is a schematic diagram of the cross-sectional structure of the filter element assembly of the present invention.

[0038] Figure 6 It is a schematic diagram of the installation of the central tube in the filter element assembly of the present invention.

[0039] Figure 7 It is a schematic diagram of the three-dimensional structure of the filter membrane assembly of the present invention.

[0040] Figure 8 The three-dimensional structure of the central tube of the present invention is shown in FIG. Figure 1 .

[0041] Fig. 9 The three-dimensional structure of the central tube of the present invention is shown in FIG. Figure 2 .

[0042] Fig.10 It is a schematic structural diagram of the outer central tube of the present invention.

[0043] Fig.11 It is a structural schematic diagram of the water inlet central pipe of the present invention.

[0044] Fig.12 Schematic diagram of the assembly of the diaphragm of the present invention Figure 1 .

[0045] Fig.13 Schematic diagram of the assembly of the diaphragm of the present invention Figure 2 .

[0046] Fig.14 It is a schematic structural diagram of the diaphragm according to the first embodiment of the present invention.

[0047] Fig.15 It is a schematic structural diagram of the diaphragm of the second embodiment of the present invention.

[0048] Description of reference numerals:

[0049] Filter 1

[0050] Filter element assembly 100

[0051] Filter membrane assembly 110

[0052] Diaphragm 111

[0053] Tape 112

[0054] Concentrate water outlet 113

[0055] Bottom diversion cloth 114

[0056] Middle guide cloth 115

[0057] Grid 116

[0058] Center tube 120

[0059] Inner center tube 121

[0060] Outer center tube 122

[0061] Channel 1221

[0062] End plate 1222

[0063] Limit hole 1223

[0064] Inlet center pipe 123

[0065] Raw water export 1231

[0066] Raised strips 1232

[0067] Inlet center pipe unit 1233

[0068] Matching parts 1234

[0069] Through hole 1235

[0070] Filter top cover 130

[0071] Filter bottom cover 140

[0072] Water channel 141

[0073] Center hole 142

[0074] Shell body 200

[0075] End cap 300

[0076] First raw water inlet 310

[0077] Second raw water inlet 320

[0078] Water purification outlet 330

[0079] Concentrate outlet 340 DETAILED DESCRIPTION

[0080] The present invention is further described below by way of examples, but the present invention is not limited to the scope of the examples.

[0081] Example 1

[0082] This embodiment provides a central tube 120, such as Figure 1-12 As shown, the central tube 120 includes an inner central tube 121, an outer central tube 122 and a water inlet central tube 123 which are coaxially arranged from the inside to the outside. The inner central tube 121 and the water inlet central tube 123 are both structures with both ends open, and the inner cavities of the inner central tube 121 and the water inlet central tube 123 are respectively provided with a first raw water channel and a second raw water channel for forming raw water flow, and the first raw water channel and the second raw water channel are connected with the open bottom end of the inner central tube 121 and the open bottom end of the water inlet central tube 123.

[0083] The water inlet central tube 123 is attached to the outer wall surface of the outer central tube 122. The side wall of the outer central tube 122 is provided with a plurality of channels 1221 for enriching clean water, and a clean water channel for clean water to flow is formed between the inner wall surface of the outer central tube 122 and the outer wall surface of the inner central tube 121. The clean water channel is closed at one end close to the open bottom end of the inner central tube 121, and is open at one end away from the open bottom end of the inner central tube 121. A plurality of raw water outlets are provided on the side wall of the water inlet central tube 123 away from the outer central tube 122, and the plurality of raw water outlets are arranged along the axial direction of the water inlet central tube 123. A plurality of convex strips are evenly provided on the inner wall surface of the water inlet central tube 123 along the axial direction.

[0084] The water inlet central tube 123 is used to install the membrane 111 that can filter water quality. The clean water enters the clean water channel after being filtered by the membrane 111. The bottom end of the clean water channel is closed to achieve the diversion of raw water and clean water. The raw water of this embodiment can flow downward to the open bottom end through the open top of the inner central tube 121. The first raw water channel and the second raw water channel are connected. Further, the raw water can enter the open bottom end of the water inlet central tube 123, and can also enter directly from the open top end of the water inlet central tube 123, so that water can enter from both ends of the water inlet central tube 123.

[0085] The central tube 120 of this embodiment can not only realize the diversion of raw water and purified water, but also realize the introduction of raw water from both sides of the water inlet central tube 123, so that there is no dead angle problem in the water inlet process, and the filtering effect of the membrane 111 can be improved. At the same time, a plurality of convex strips are arranged inside the water inlet central tube 123, so that the water flow in the water inlet central tube 123 is more chaotic, the flushing effect of the water flow is improved, and impurities are prevented from accumulating in the membrane 111, thereby improving the filtering effect of the membrane 111.

[0086] The outer central tube 122 is a polygonal structure, and the water inlet central tube 123 includes a plurality of independent water inlet central tube units 1233 correspondingly arranged along each side of the polygonal structure, and the water inlet central tube units 1233 contact the surface of the outer central tube 122 and fit with the outer wall of the outer central tube 122. The water inlet central tube 123 is composed of a plurality of independent water inlet central tube units 1233, which is convenient for the water inlet central tube 123 after the raw water is split, and is also convenient for the installation of the diaphragm 111. The water inlet central tube unit 1233 is installed in a fit with the outer central tube 122, which can improve the stability of the installation of the water inlet central tube unit 1233, thereby preventing the diaphragm 111 from being worn.

[0087] The water inlet central tube unit 1233 is an arc-shaped tube formed by connecting a plate-like structure and an arc structure, and the surface of the plate-like structure fits the outer wall of the outer central tube 122. The raw water outlet is located on the arc structure, and the convex strip is located on the plate-like structure. A long through hole 1235 is opened on the plate-like structure, and the convex strip is clamped in the through hole 1235, so that the clean water flowing out after being filtered by the membrane can flow out from the water inlet central unit 1233. The surface of the plate-like structure fits with the outer wall of the outer center tube 122, so that the water inlet center tube unit 1233 fits more closely with the outer center tube 122, and no sliding occurs between the water inlet center tube unit 1233 and the outer center tube 122; at the same time, the outer center tube 122 has a polygonal structure, and the plate-like structure of the water inlet center tube unit 1233 can facilitate the diaphragm 111 to divide the outer center tube 122 into equal parts, and the arc structure of the water inlet center tube unit 1233 can facilitate safer tightening of the diaphragm 111 when it is wound around the center tube 120, and the outer edge of the water inlet center tube unit 1233 will not generate a force to cut the diaphragm 111, causing damage to the coating, and at the same time, the diaphragm 111 can maintain a cylindrical structure after winding, rather than a special-shaped structure, and can match the existing filter element end cover 300.

[0088] The outer surface of the water inlet central tube unit 1233 in contact with the outer central tube 122 is provided with a matching piece 1234 for clamping with the outer central tube 122. In this embodiment, the matching piece 1234 can be a clamping block, and a clamping groove is correspondingly provided on the surface of the outer central tube 122. In other embodiments, the water inlet central tube unit 1233 and the outer central tube 122 can also be connected in other ways that are convenient for disassembly and assembly.

[0089] An end plate 1222 is provided at one end of the outer central tube 122 near the open bottom end of the inner central tube 121, and the end plate 1222 is sealed and connected to the tube wall of the outer central tube 122. A limiting hole 1223 is provided at the center of the end plate 1222, and the inner central tube 121 passes through the limiting hole 1223 and is sealed and connected to the end plate 1222. The end plate 1222 can achieve sealing between the outer central tube 122 and the inner central tube 121, thereby achieving the diversion of purified water and raw water.

[0090] The present embodiment also provides a filter element assembly 100, which includes a plurality of membranes 111 and the central tube 120 as described above. Each membrane 111 is respectively wound on a water inlet central tube unit 1233, and the sides of adjacent membranes 111 in the length direction are sealed and connected to each other and wound on the central tube 120 in the same direction to form a filter membrane assembly 110. The filter element assembly 100 also includes a filter element top cover 130 and a filter element bottom cover 140, and the filter element bottom cover 140 is arranged on one side close to the open bottom end of the inner central tube 121 to connect the open bottom end of the inner central tube 121 and the open bottom end of the water inlet central tube 123. The filter element bottom cover 140 is an open structure at one end, and the opening is arranged toward the filter membrane assembly 110; a central hole 142 is opened on the filter element top cover 130, and the central tube 120 is clamped in the central hole 142.

[0091] When the diaphragm 111 passes through the water inlet central tube unit 1233, the raw water entering the water inlet central tube unit 1233 flows from the raw water outlet to the filter surface of the diaphragm 111. The sides of the adjacent diaphragms 111 in the length direction are sealed and connected to each other. After the clean water passes through the diaphragm 111, a clean water surface is formed on the opposite side of the filter surface of the diaphragm 111, and enters the clean water channel through the hole 1221 on the outer central tube 122. The filter element bottom cover 140 can connect the open bottom end of the inner central tube 121 and the open bottom end of the water inlet central tube 123, that is, the filter element bottom cover 140 can connect the first raw water channel and the second raw water channel to achieve water inflow from the bottom of the water inlet central tube 123, and then achieve water inflow from both ends of the water inlet central tube 123. The surface of the end plate 1222 is provided with threads, and the filter element bottom cover 140 is connected to the end plate 1222 through threads.

[0092] A plurality of water guide grooves 141 are provided on the filter element top cover 130 and the filter element bottom cover 140, and each water guide groove 141 is inserted into the water inlet central tube unit 1233 toward one end of the filter membrane assembly 110. The end of the water guide groove 141 on the filter element bottom cover 140 away from the filter membrane assembly 110 is sealed and connected to the inner cavity of the inner central tube 121 to connect to the first raw water channel. The end of the water guide groove 141 on the filter element top cover 130 away from the filter membrane assembly 110 is configured to be able to communicate with external raw water to connect to the second raw water channel.

[0093] The raw water entering from the top of the inner center tube 121 flows downward to the open bottom end of the inner center tube 121, and then flows downward to the end of the water guide groove 141 set on the filter element bottom cover 140 away from the filter membrane assembly 110, and further flows from the inside of the water guide groove 141 to the end of the water guide groove 141 close to the filter membrane assembly 110. The end of the water guide groove 141 close to the filter membrane assembly 110 is set in the water inlet center tube unit 1233, and the filter element bottom cover 140 can guide the raw water in the inner center tube 121 to the water inlet center tube unit 1233 respectively.

[0094] The raw water entering from the top of the filter element top cover 130 forms an annular water flow and enters the end of the water guide groove 141 away from the filter membrane assembly 110, and further flows from the water guide groove 141 to the end of the water guide groove 141 close to the filter membrane assembly 110. The end of the water guide groove 141 close to the filter membrane assembly 110 is arranged in the water inlet central pipe unit 1233, which can guide the raw water entering from the top of the filter element top cover 130 to the water inlet central pipe unit 1233.

[0095] The membrane 111 is arranged between the two matching pieces 1234, which does not hinder the installation of the membrane 111 and facilitates the installation of the water inlet central pipe unit 1233. Specifically, the matching piece 1234 can be a protrusion, and a matching groove is correspondingly provided on the outer central pipe 122.

[0096] The filter element assembly 100 of the present invention comprises an inner central tube 121, an outer central tube 122, 6 water inlet central tubes 123, 6 grids 116, 6 middle guide fabrics 115, 1 bottom guide fabric 114, and 6 membranes 111. Fig.14 As shown, the area surrounded by the dotted line is a single diaphragm 111, and the ends of two adjacent diaphragms 111 in the length direction are sealed and connected. Six diaphragms 111 that are folded and sealed at both ends form a membrane bag. The diaphragm 111 can be an ultrafiltration, microfiltration, nanofiltration or reverse osmosis diaphragm. A concentrated water channel is formed between the inner side surfaces of each diaphragm 111, and a grid 116 is provided between the inner side surfaces of each diaphragm 111. The space between the outer side surfaces of adjacent diaphragms 111 forms a clean water channel, and an intermediate guide cloth 115 is provided between the outer side surfaces of adjacent diaphragms 111. In other embodiments, the number of diaphragms 111 and the water inlet center pipe 123 can be any number from 2 to 8.

[0097] In this embodiment, the thickness of the grid 116 is 0.86 mm; in other embodiments, it can be any thickness between 0.25 and 0.86 mm. The thickness of the middle guide cloth and the bottom guide cloth is 0.1 mm; in other embodiments, it can be any thickness between 0.1 and 0.5 mm.

[0098] Pretreatment of the diaphragm 111 before passing through the water inlet central pipe unit 1233: fold the diaphragm 111 in half, with the long page being 0.5 to 3 mm longer than the short page. The inner side surface formed after folding is a smooth surface (coated surface), and the grid 116 and the water inlet central pipe unit 1233 are stuffed inside.

[0099] When rolling the film, Fig.12 As shown, first weld the bottom guide cloth 114 to the outer center tube 122, then stack the pre-treated membrane 111 on the bottom guide cloth 114, and then apply the following Fig.12The U-shaped glue line shown by the dotted line is buckled into the outer center tube 122 after the glue line is applied, and the water inlet center tube 123 is buckled into the outer center tube 122 to complete the rolling of the first page of diaphragm 111. The remaining diaphragms 111 are stacked in sequence, and the middle guide cloth 115 is set between adjacent diaphragms 111. After all diaphragms 111 are glued, they are rolled into a cylindrical shape and fixed with a perforated tape 112. The tape 112 is provided with a concentrated water outlet 113 and placed in an environment with suitable temperature and humidity (temperature 25±3℃, humidity 50%-70%) for curing for more than 8 hours. The surface of the filter element top cover 130 opposite to the diaphragm 111 and the surface of the filter element bottom cover 140 opposite to the diaphragm 111 are coated with sealant. Apply sealant to the filter element top cover 130 and the filter element bottom cover 140. After the glue is basically leveled, insert the water guide groove 141 of the filter element bottom cover 140 into the water inlet central tube unit 1233. After installation, press the filter membrane element for more than 2 hours to allow the glue to initially solidify; insert the water guide groove 141 of the filter element bottom cover 140 into the water inlet central tube unit 1233 for installation. After pressing for 2 hours, the membrane element continues to solidify for more than 8 hours in an environment with appropriate temperature and humidity (temperature 25±3℃, humidity 50%-70%). After the diaphragm 111 is wound, a diaphragm roll with a central tube is formed. After the filter element top cover 130 and the filter element bottom cover 140 are coated with glue, the end surface of the diaphragm roll can be sealed.

[0100] The filter element assembly 100 of this embodiment introduces raw water at both ends of the water inlet central tube 123, making the water inlet more uniform and the flushing ability stronger. Compared with the conventional side-flow filter element assembly 100, the filter element assembly 100 of this embodiment discharges water from the side of the water inlet central tube 123 and is evenly distributed, improving the uniformity of the fluid on the surface of the diaphragm 111 on the side of the grid 116, reducing the dead zone of raw water flow, and reducing eddy currents; there is a convex strip structure inside the water inlet central tube 123, which makes the outlet water flow more chaotic, improves the ability of the water flow to flush the grid, increases the fluid flow rate, slows down the pollution of the membrane surface, and extends the life of the filter element. The diaphragm 111 is evenly distributed on the outer central tube 122, making the entire filtration process more stable: the water inlet central tube 123 and the outer central tube 122 are interlocked with each other to form a fixed polygon, and the membrane roll structure of the diaphragm 111 is more stable and standard, thereby ensuring more stable performance.

[0101] Compared with the existing filter element group, the filter element assembly 100 of this embodiment can reduce the operating procedures and materials during manufacturing, thereby reducing the processing cost: the raw water enters the interior of the filter membrane element through the water inlet center tube 123, and there is no need to let in water from the entire end face or part of the end face, so there is no need to consider the flatness of the end face of the membrane 111, and then the end face of the membrane element no longer needs to be cut and peeled, thereby reducing the processing procedures; the end face is no longer cut, and then the glue line can be closer to the edge, and the amount can be less, thereby improving the utilization rate of the membrane 111 and reducing material costs.

[0102] The end face of the diaphragm 111 after winding is more thoroughly blocked, and the qualified rate is higher: the raw water enters through the water inlet center pipe 123, and the upper and lower end faces are no longer partially blocked or partially unblocked, and can be completely blocked, which is easier to operate and has a higher qualified rate. In addition, there is no need to cut the end face of the diaphragm 111 after winding, which reduces the processing steps and improves production efficiency; the amount of glue on the diaphragm 111 is significantly reduced, and the utilization rate of the diaphragm 111 is improved, which effectively improves the performance of the membrane element. The filter element top cover 130 and the filter element bottom cover 140 can be sealed by fully coating with glue, without having to worry about problems such as glue overflow, which reduces the difficulty of the process.

[0103] As shown in the table below, the effective utilization rate of common diaphragms in the prior art is basically 75.2%. In Example 1, the two ends of the wound body formed after the diaphragm is wound are sealed without leaving any gaps, and water enters through the end caps, so there is no need to perform trimming, peeling and other processes, saving time. In addition, the internal glue line can also be moved outward, which can now be increased to 85%, which can improve the utilization rate of the diaphragm.

[0104]

[0105] The present embodiment also provides a filter 1, which includes an outer shell and a filter element assembly 100 as described above, wherein the outer shell includes a shell body 200 with an opening at one end and an end cover 300 arranged at the open end of the shell body 200. The end cover 300 is provided with a first raw water inlet 310, a second raw water inlet 320 and a clean water inlet 330. The first raw water inlet 310 is sealed and connected to the inner cavity of the inner center tube 121 to connect to the first raw water channel. The second raw water inlet 320 is sealed and connected to the inner cavity of the water inlet center tube 123 to connect to the second raw water channel. The clean water inlet 330 is sealed and connected to the inner cavity of the outer center tube 122 to connect to the clean water channel. By centrally arranging the first raw water inlet 310, the second raw water inlet 320 and the clean water inlet 330 on the surface of the end cover 300, it is convenient to connect the water pipe of the filter 1.

[0106] A concentrated water channel is formed between the outer surface of the filter element top cover 130, the outer surface of the filter membrane assembly 110 and the inner side wall of the shell body 200 for the concentrated water produced by the filter membrane assembly 110 to flow. The end cover 300 is also provided with a concentrated water port 340, which is connected to the concentrated water channel. Concentrated water flows out from the outer edge of the membrane 111 of the filter membrane assembly 110. The filter membrane assembly 110 is installed in the shell body 200, and the bottom of the shell body 200 is closed, so the concentrated water can only flow upward to the concentrated water port 340 through the concentrated water channel.

[0107] The raw water entering the filter 1 is divided into two paths, one of which enters the filter element top cover 130 from the first raw water inlet 310 and then enters the water inlet central tube 123 through the water guide groove 141. The other raw water enters from the first raw water inlet 310, enters the bottom of the filter membrane element along the inner central tube 121, and then enters the water inlet central tube 123 through the water guide groove 141. Finally, the raw water spirals outward along the membrane 111, and the clean water that permeates the membrane 111 is collected along the middle guide cloth 115 to the outer central tube 122 and flows out from the outer central tube 122. After the raw water finally spirals out, it becomes concentrated water due to the increase in concentration and is discharged through the concentrated water inlet 340.

[0108] The filter element assembly 100 was tested with water-efficient water. From the comparison of the life span data of producing 5000L of purified water, it can be seen that the life cut-off flux of the filter element assembly 100 of this embodiment is 22% greater than that of the filter element assembly of the ordinary end-flow rolling process.

[0109] The detailed comparison data of the filter element assembly of the common end-flow rolling process, such as the conventional 3012-400G (6 membrane sheets / equal length folded in half and rolled up; the center tube discharges clean water, the lower end surface of the membrane winding body enters raw water, and the upper end surface of the membrane winding body (sealing ring end) discharges waste water) are as follows:

[0110]

[0111] Example 2

[0112] The difference between this embodiment and embodiment 1 is that Fig.15 As shown, the lengths of the two sides 111 of the folded membrane are different. The assembly method of the filter element assembly 100 of this embodiment includes the following steps:

[0113] Step 1: Prepare a central tube;

[0114] Step 2: prepare 6 1000mm*300mm long membrane sheets 111, which are pre-folded according to the length of 490mm and 510mm; prepare 6 middle guide cloths with a length of 530mm and a width of 300mm; prepare 6 grids with a length of 510mm and a width of 300mm, cut and insert them into the corresponding folded membrane sheets 111, and the grids 116 are located between the inner sides of the membrane sheets 111; insert the water inlet center pipe 123 into the folded membrane sheets 111, and pay attention to the arc structure pressing the grid, and the membrane 111 is between the two matching pieces 1234 of the water inlet center pipe 123; prepare 1 roll of guide cloth with a width of 300mm as the bottom guide cloth 114;

[0115] Step 3: Pull the bottom guide cloth 114 to the bottom of the central tube 120 and weld the bottom guide cloth 114 to the central tube 120 by ultrasonic welding;

[0116] Step 4: Place the folded first film sheet 111 and print Fig.12 The U-shaped glue line shown by the dotted line, and then the matching piece 1234 of the water inlet center tube 123 is inserted into the corresponding slot of the outer center tube 122. After the outer center tube 122 is clamped, it is pre-wound by 1 / 6 of a circle; Fig.13 As shown, the second and third membrane sheets 111 are glued and inserted in sequence, and finally the remaining membrane sheets 111 are rolled up into a cylinder, and the outside of the membrane element is wrapped with adhesive tape 112 for fixing.

[0117] Step 5: After the filter element is cured for 8 hours, perform an air test to ensure that the filter element is rolled well.

[0118] Step 6: Apply glue to the bottom cover 140 of the filter element, and then install the filter membrane element on the bottom cover 140 of the filter element. Insert the water guide groove 141 of the bottom cover 140 of the filter element into the inside of the water inlet central pipe unit 1233. After pressing and curing for 2 hours, the glue has dried on the surface and no longer flows. Referring to the above steps, install the filter membrane element on the top cover 130 of the filter element, and finally let it stand for more than 8 hours for complete curing.

[0119] Step 7: After the glue solidifies, put it into the packaging bag and seal it.

[0120] The above is the implementation process of the entire filter element assembly 100.

[0121] The life-end flux is 10% greater than that of the filter element assembly in Example 1 in which the membrane 111 has the same length.

[0122] Although the specific embodiments of the present invention are described above, it should be understood by those skilled in the art that this is only for illustration and the protection scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. A filter element assembly, characterized in that: It includes a central tube and a plurality of diaphragms; The central tube comprises an inner central tube, an outer central tube and a water inlet central tube which are coaxially arranged in sequence from the inside to the outside, the inner central tube and the water inlet central tube are both structures with openings at both ends, the inner cavities of the inner central tube and the water inlet central tube are respectively provided with a first raw water channel and a second raw water channel for forming raw water flow, the first raw water channel and the second raw water channel are connected with the open bottom end of the water inlet central tube through the open bottom end of the inner central tube; The water inlet central tube is attached to the outer wall surface of the outer central tube; a plurality of channels for enriching clean water are provided on the side wall of the outer central tube, and a clean water channel for clean water to flow is formed between the inner wall surface of the outer central tube and the outer wall surface of the inner central tube; the clean water channel has one end close to the open bottom end of the inner central tube closed and one end away from the open bottom end of the inner central tube open; A plurality of raw water outlets are provided on the side wall of the water inlet central tube away from the outer central tube, and the plurality of raw water outlets are arranged along the axial direction of the water inlet central tube; a plurality of convex strips are evenly provided on the inner wall surface of the water inlet central tube along the axial direction; The outer central tube is in a polygonal structure, and the water inlet central tube includes a plurality of independent water inlet central tube units correspondingly arranged along each side of the polygonal structure, and the water inlet central tube units contact the surface of the outer central tube and fit with the outer wall of the outer central tube; Each of the membrane sheets is folded and wound around one of the water inlet central tube units; the sides of the adjacent membrane sheets in the length direction are sealed and connected to each other and wound around the central tube in the same direction to form a filter membrane assembly; The filter element assembly further includes a filter element top cover and a filter element bottom cover, wherein the filter element bottom cover is arranged on a side close to the open bottom end of the inner central tube to connect the open bottom end of the inner central tube with the open bottom end of the water inlet central tube; The bottom cover of the filter element is an open structure at one end, and the opening is arranged toward the filter membrane assembly; the top cover of the filter element is provided with a center hole, and the center tube is clamped in the center hole.

2. The filter element assembly according to claim 1, characterized in that: A plurality of water guide grooves are provided on the filter element top cover and the filter element bottom cover, and each of the water guide grooves is inserted into the water inlet central tube toward one end of the filter membrane assembly; The end of the water guide groove on the filter element top cover away from the filter membrane assembly is configured to be able to communicate with external raw water to communicate with the second raw water channel; One end of the water guide groove on the bottom cover of the filter element away from the filter membrane assembly is sealed and connected to the inner cavity of the inner center tube to connect to the first raw water channel.

3. The filter element assembly according to claim 1, characterized in that: The surface of the water inlet central tube unit contacting the outer central tube is provided with a fitting for clamping with the outer central tube. Two fittings are provided and clamped at two ends of the outer central tube respectively. The diaphragm is located between the two fittings.

4. The central tube according to claim 1, characterized in that An end plate is provided at one end of the outer central tube close to the open bottom end of the inner central tube, and the end plate is sealedly connected to the tube wall of the outer central tube; A limiting hole is provided at the center of the end plate, and the inner center pipe is clamped in the limiting hole and is sealed and connected to the end plate.

5. The filter element assembly according to claim 1, characterized in that: A concentrated water channel is formed between the inner sides of each of the diaphragms, and a grid is provided between the inner sides of each of the diaphragms; And / or, the space between the outer sides of adjacent membranes forms a clean water channel, and an intermediate guide cloth is provided between the outer sides of adjacent membranes.

6. The filter element assembly according to claim 1, characterized in that: The water inlet central tube unit is an arc-shaped tube formed by connecting a plate-like structure and an arc structure, and the surface of the plate-like structure is in contact with the outer wall of the outer central tube; the raw water outlet is located on the arc structure, and a long strip-shaped through hole is opened on the plate-like structure, and the convex strip is clamped in the through hole.

7. The filter element assembly according to claim 1, characterized in that: The surface of the filter element top cover opposite to the diaphragm and the surface of the filter element bottom cover opposite to the diaphragm are both coated with sealant.

8. A filter, characterized in that: It comprises a shell and a filter element assembly as described in any one of claims 1 to 7, wherein the shell comprises a shell body with an opening at one end and an end cover arranged at the open end of the shell body.

9. The filter according to claim 8, characterized in that The end cover is provided with a first raw water inlet, a second raw water inlet and a purified water inlet; The first raw water inlet is sealedly connected to the inner cavity of the inner central tube to connect to the first raw water channel; The second raw water inlet is sealedly connected to the inner cavity of the water inlet central pipe to connect to the second raw water channel; The clean water port is sealed and connected to the inner cavity of the outer central tube to connect to the clean water channel.

10. The filter according to claim 9, characterized in that A concentrated water channel for concentrated water produced by the filter membrane assembly to flow is formed between the outer surface of the filter element top cover, the outer surface of the filter membrane assembly and the inner side wall of the shell body. A concentrated water port is also provided on the end cover, and the concentrated water port is connected to the concentrated water channel.

Images