Filtering membrane assembly and filter comprising same

Abstract

The utility model discloses a filtering membrane assembly and a filter comprising the same. The filtering membrane assembly comprises a plurality of membrane units which are stacked in parallel and have the same opening, each diaphragm unit comprises two stacked single diaphragms, the same ends of the single diaphragms are mutually folded inwards to form a long diaphragm part and a folded diaphragm part, and the long diaphragm part is longer than the folded diaphragm part; the inner side surface of the single membrane is a smooth surface, and a raw water channel is formed between the smooth surface of the long membrane part and the smooth surface of the folding membrane part; a wastewater channel is formed between the smooth surfaces of the long membrane parts of the single membranes in each membrane unit; water purification channels are formed between the outer side surfaces of the folded membrane parts in each membrane unit and between the outer side surfaces of the two long membrane parts of the adjacent membrane units; each diaphragm unit further comprises a long grid, long flow guide cloth, a short grid and short flow guide cloth; a conventional grid is replaced with the combination mode of the grid and the flow guide cloth, and dirt can be washed away while supporting is conducted.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of filter membrane assemblies and the filter comprising it. BACKGROUND

[0002] At present, the filter cartridge is widely used in industrial water treatment and domestic water purification. The filter cartridge includes a center tube, a filter membrane assembly, an upper end cap and a lower end cap. The filter membrane assembly is wound around the center tube. The upper end cap and the lower end cap are respectively sleeved on both ends of the filter membrane assembly. In the filter membrane assembly, the grid is commonly used as a support material for raw water channels, and the guide cloth is used as a support material for clean water channels. The grid supports the raw water channels between the membrane sheets. The grid is arranged with warp and weft lines to allow the raw water to have a turbulent flow. However, the raw water has a large resistance when passing through the grid. The cross angle formed by the grid is easy to hide dirt. The guide cloth supports the clean water channels between the membrane sheets. After the membrane sheets produce water, the guide cloth collects the water to the center tube. However, the clean water side flow path is too long, has a large back pressure, a small transmembrane pressure difference, and a poor flow rate. SUMMARY

[0003] The utility model solves the problem of the prior art that when the grid supports the membrane sheets, the raw water has a large resistance when passing through the grid, and the cross angle formed by the grid is easy to hide dirt. The utility model provides a filter membrane assembly and a filter comprising the same.

[0004] The utility model solves the above technical problems by the following technical solutions:

[0005] A filter membrane assembly includes a plurality of parallel stacked membrane sheet units. The openings of the membrane sheet units are the same. Each membrane sheet unit includes two stacked single membrane sheets. The same ends of the two single membrane sheets are folded inward to form a long membrane portion and a folded membrane portion. The length of the long membrane portion is greater than the length of the folded membrane portion.

[0006] The folded membrane portions of adjacent single membrane sheets in each membrane sheet unit are connected to each other. The long membrane portions of adjacent single membrane sheets of adjacent membrane sheet units are connected to each other. The inner side surfaces of the single membrane sheets are smooth surfaces. The space between the smooth surface of the long membrane portion and the smooth surface of the folded membrane portion of each single membrane sheet forms a raw water channel. The space between the smooth surfaces of the long membrane portions of the abutting single membrane sheets of each membrane sheet unit forms a wastewater channel. The space between the outer side surfaces of the two folded membrane portions of each membrane sheet unit and the space between the outer side surfaces of the two long membrane portions of adjacent membrane sheet units form clean water channels.

[0007] Each of the membrane sheet units further comprises a long grid, a long flow guide cloth, a short grid and a short flow guide cloth; the long grid is connected to one side of the long flow guide cloth, and the long grid and the long flow guide cloth are located in the wastewater channel and are inserted into one of the raw water channels in each of the membrane sheet units; the short grid is connected to one side of the short flow guide cloth, and the short grid and the short flow guide cloth are located in the other raw water channel in each of the membrane sheet units.

[0008] In the scheme, the long grid is connected to one side of the long flow guide cloth, and the short grid is connected to one side of the short flow guide cloth, the grid and flow guide cloth combination is used to replace the conventional grid, the function of the grid is retained, and at the same time, a part of the water can flow through the flow guide channel, the resistance caused by the pure grid is reduced, and at the same time, the high flow rate of the raw water on the flow guide cloth can also flush the intersection of the grid.

[0009] Preferably, the two side surfaces of the long flow guide cloth each have a first flow guide channel, and the number of the long grids is two, and the two long grids are respectively connected to the two side surfaces of the long flow guide cloth.

[0010] In the scheme, the first flow guide channels are arranged on the two side surfaces of the long flow guide cloth, the support for the single membrane sheet is maintained, the flow guide groove is increased, the problems of long flow channel, high back pressure and small transmembrane pressure difference in the channel are solved, the flow is increased under the same pressure, and the scheme is more suitable for application in the working condition of non-ultra-high pressure of household water purification and in the environment of longitudinal cutting of long membrane sheets.

[0011] Preferably, the two side surfaces of the short flow guide cloth each have a second flow guide channel, and the number of the short grids is two, and the two short grids are respectively connected to the two side surfaces of the short flow guide cloth.

[0012] In the scheme, the second flow guide channels are arranged on the two side surfaces of the short flow guide cloth, and the support is provided in both directions, the water is more easily guided while the support is ensured, and the scheme is more suitable for the flow of a large amount of water produced by the single membrane sheet to the central pipe through the flow guide cloth. At the same time, the support of the short grid and the function of the short grid warp and weft to generate turbulent flow of the purified water are exerted, and a part of the purified water flows through the second flow guide channels on the two side surfaces through the short flow guide cloth.

[0013] Preferably, the single membrane sheet, the long grid and the long flow guide cloth are mutually welded; and / or, the single membrane sheet, the short grid and the short flow guide cloth are mutually welded.

[0014] In the scheme, the above structure is adopted, the long guide cloth, the single membrane sheet and the long grid are pre-welded together, the short guide cloth, the single membrane sheet and the short grid are pre-welded together, the disadvantage that the upper part of the stepped side flow film is not easy to take and place when the film is rolled is solved, the qualified rate of the rolled film and the stability of the finished product are improved, the production efficiency is improved, and the effect of reducing the process defect is realized.

[0015] Preferably, each of the membrane sheet units further comprises an inner guide cloth, which is arranged in the purified water channel, and which is located between the outer sides of the two folded membrane parts of each of the membrane sheet units.

[0016] In the scheme, the above structure is adopted, the inner guide cloth is arranged in the purified water channel of each of the membrane sheet units, and the inner guide cloth is arranged between the outer sides of the two single membrane sheets, thereby serving as a support material of the purified water channel.

[0017] Preferably, the inner guide cloth and the outer sides of the two folded membrane parts are welded to each other.

[0018] In the scheme, the above structure is adopted, the inner guide cloth and the outer sides of the two single membrane sheets are welded to each other to fix the position, thereby preventing the inner guide cloth from moving away from the purified water channel when the film is rolled.

[0019] Preferably, the filter membrane assembly further comprises a plurality of outer guide cloths, each of which is arranged in the purified water channel, and each of which is inserted between the outer sides of the two long membrane parts of the adjacent membrane sheet units.

[0020] In the scheme, the above structure is adopted, the outer guide cloth is arranged in the purified water channel formed between the outer sides of the long membrane parts of the two single membrane sheets of the adjacent membrane sheet units, and the outer guide cloth serves as a support material of the purified water channel.

[0021] Preferably, the outer guide cloth and the outer sides of the two long membrane parts of the adjacent membrane sheet units are welded to each other.

[0022] In the scheme, the above structure is adopted, the outer guide cloth and the outer sides of the two long membrane parts of the adjacent membrane sheet units are welded to each other to fix the position, thereby preventing the outer guide cloth from moving away from the purified water channel when the film is rolled.

[0023] Preferably, the two single membrane sheets in each of the membrane sheet units are nanofiltration membranes; or, the two single membrane sheets in each of the membrane sheet units are reverse osmosis membranes; or, the two single membrane sheets in each of the membrane sheet units are nanofiltration membranes and reverse osmosis membranes, respectively.

[0024] A filter comprising the filter membrane assembly as described above.

[0025] On the basis of common knowledge in the art, the above-mentioned preferred conditions can be combined arbitrarily, thereby obtaining a preferred embodiment of the utility model.

[0026] The positive progress effect of the utility model is that:

[0027] The filter membrane assembly and the filter comprising the same of the utility model use a combination of a grid and a flow guide cloth to replace a conventional grid, which can support and flush dirt at the same time. The original function of the grid is to support the raw water channel between the membrane pieces, and the longitudinal and latitudinal lines of the grid are arranged to allow the raw water to have a turbulent effect. However, the raw water passing through the grid has a large resistance, and the intersection angle formed by the grid is easy to hide dirt. Through the combination of the grid and the flow guide cloth, the function of the grid is retained, and at the same time, a part of the water can pass through the flow guide channel to flow, reducing the resistance caused by the pure grid. At the same time, the high-flow raw water on the flow guide cloth can also flush the intersection point of the grid, carrying away the dirt. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 It is an exploded structural schematic view of the filter membrane assembly and the center pipe of the embodiment of the utility model.

[0029] Figure 2 It is an internal structure schematic view of the filter membrane assembly of the embodiment of the utility model.

[0030] Figure 3 It is an internal structure schematic view of the flow guide cloth and the grid of the embodiment of the utility model.

[0031] BRIEF DESCRIPTION OF DRAWINGS

[0032] Filter membrane assembly 100

[0033] Raw water channel 101

[0034] Clean water channel 102

[0035] Waste water channel 103

[0036] Filter 200

[0037] Membrane piece unit 20

[0038] Single membrane piece 21

[0039] Long membrane part 211

[0040] Folded membrane part 212

[0041] Long flow guide cloth 22

[0042] Flow guide groove 220

[0043] First diversion channel 221

[0044] Long grid 23

[0045] Short diversion cloth 24

[0046] Short grid 25

[0047] Inner diversion cloth 26

[0048] External diversion cloth 27

[0049] Glue line 31

[0050] Central tube 40 Detailed Implementation

[0051] The present invention will be described more clearly and completely below by way of embodiments and in conjunction with the accompanying drawings, but the present invention is not limited to the scope of the embodiments described below.

[0052] like Figure 1 and Figure 2 As shown, this utility model embodiment discloses a filter 200, which includes a central tube 40 and a filter membrane assembly 100, with the filter membrane assembly 100 wound around the central tube 40.

[0053] The filtration membrane assembly 100 includes multiple parallel stacked membrane units 20, each membrane unit 20 having the same opening; each membrane unit 20 includes two stacked single membranes 21, with the same end of the two single membranes 21 folded inwards to form a long membrane portion 211 and a folded membrane portion 212, the length of the long membrane portion 211 being greater than the length of the folded membrane portion 212; the folded membrane portions 212 of adjacent single membranes 21 within each membrane unit 20 are interconnected, and the long membrane portions 211 of adjacent single membranes 21 in adjacent membrane units 20 are interconnected; the inner surface of each single membrane 21 is a smooth surface, and the space between the smooth surface of the long membrane portion 211 and the smooth surface of the folded membrane portion 212 of each single membrane 21 forms a raw water channel 101; the mating single membranes of each membrane unit 20... The space between the smooth surfaces of the long membrane portions 211 of the membrane 21 forms a wastewater channel 103; the space between the outer surfaces of the two folded membrane portions 212 that are attached to each other in each membrane unit 20, and the space between the outer surfaces of the two long membrane portions 211 that are attached to each other in adjacent membrane units 20, both form a purified water channel 102; each membrane unit 20 also includes a long grid 23, a long guide cloth 22, a short grid 25, and a short guide cloth 24; the long grid 23 is connected to one side of the long guide cloth 22, and the long grid 23 and the long guide cloth 22 are located in the wastewater channel 103 and inserted into one of the raw water channels 101 in each membrane unit 20, the short grid 25 is connected to one side of the short guide cloth 24, and the short grid 25 and the short guide cloth 24 are located in another raw water channel 101 in each membrane unit 20.

[0054] In the embodiment, the filter membrane assembly 100 comprises a plurality of membrane sheet units 20 arranged in parallel, each of the membrane sheet units 20 comprises two single membrane sheets 21. Due to the guaranteed step flow rate and small water inlet, the interval between the single membrane sheets 21 needs to be opened as much as possible to better enter water and reduce the pollution of the water inlet. In general, a grid is used as the support material of the raw water channel 101 when the membrane is stacked. However, the existing conventional grid, the thicker grid generally has fewer warp and weft lines, such as 16 warp and weft lines in 1 square inch. The support effect of such a grid is not as good as that of a thin grid, which has 32 warp and weft lines in 1 square inch. The thin grid can maintain the support effect, but cannot well open the interval between the single membrane sheets 21 to improve the water inlet effect. In the embodiment, the combination of the grid and the flow guide cloth is used to replace the traditional single grid to achieve the effect of maintaining the support effect and opening the interval between the membrane sheets. In this way, while retaining the support effect of the grid, a part of the water can flow through the flow guide groove 220 on the flow guide cloth to solve the problem of excessive resistance caused by the pure grid and the problem of easy dirt accumulation at the intersection of the grid caused by the pure grid. Such a setting improves the raw water surface flow rate and the anti-pollution property, and improves the service life of the filter membrane assembly 100. Since it is a combination of multiple pieces of grid and flow guide cloth, the thickness of the grid and the flow guide cloth can be matched according to actual needs. Even if the thinnest grid is selected, there is no need to worry about the problem of membrane blockage. The diameter of the filter membrane after winding or the size of the raw water channel 101 inlet can be adjusted, and the design can be flexibly selected to expand the selection range of the grid.

[0055] As shown in Figure 2 two stacked single membrane sheets 21 are folded inward at the same end, each single membrane sheet 21 forms a long membrane part 211 and a folded membrane part 212, and the length of the long membrane part 211 is greater than the length of the folded membrane part 212. The inner side of the single membrane sheet 21 is a smooth surface. In each membrane sheet unit 20, the long membrane parts 211 of the two adjacent single membrane sheets 21 are connected at one end to form a raw water channel 101 with one end closed, and there are two raw water channels 101 in each membrane sheet unit 20. The other end of the two long membrane parts 211 forms a waste water channel 103 and is outwardly open. The space between the outer sides of the folded membrane parts 212 of the two adjacent single membrane sheets 21 forms a clean water channel 102, and the clean water channel 102 corresponding to the folded membrane part 212 is relatively narrow. The space between the outer sides of the long membrane parts 211 of the two single membrane sheets 21 of the two adjacent membrane sheet units 20 forms a clean water channel 102, and the clean water channel 102 corresponding to the long membrane part 211 is relatively wide. The openings of all membrane sheet units 20 in the filter membrane assembly 100 are consistent, and the end of the single membrane sheet 21 bent and closed is provided with a center tube 40.

[0056] A set of long grids 23 and long flow guide cloth 22, and another set of short grids 25 and short flow guide cloth 24 are placed in each membrane unit 20 in the embodiment. Figure 2 As shown in the upper raw water channel 101, the short grid 25, the short flow guide cloth 24 and another layer of short grid 25 are placed in sequence; in the lower raw water channel 101, the long grid 23, the long flow guide cloth 22 and another layer of long grid 23 are placed in sequence, and the long grid 23 and the long flow guide cloth 22 extend from the raw water channel 101 to the waste water channel 103.

[0057] The existing long membrane is usually configured with a long grid, and sometimes the grid is 40% longer than the conventional grid, which will cause more resistance when the raw water flows to the tail, thereby affecting the initial flux and reducing the flow flux.

[0058] Specifically, the embodiment adopts a side flow membrane, and the flow direction of the flow guide groove 220 of the long flow guide cloth 22 or the short flow guide cloth 24 is perpendicular to the central pipe 40. The direction of the flow guide groove 220 of the flow guide cloth needs to conform to the direction of the raw water flow, which is perpendicular to the direction of the central pipe 40. If an end flow membrane is used, the flow guide groove 220 of the flow guide cloth needs to be in the direction of the raw water, which is parallel to the direction of the central pipe 40.

[0059] As shown in the upper raw water channel 101, the short grid 25, the short flow guide cloth 24 and another layer of short grid 25 are placed in sequence; in the lower raw water channel 101, the long grid 23, the long flow guide cloth 22 and another layer of long grid 23 are placed in sequence, and the long grid 23 and the long flow guide cloth 22 extend from the raw water channel 101 to the waste water channel 103. Figure 3 As shown, the long flow guide cloth 22 has a first flow guide channel 221 on both sides, and the number of long grids 23 is two, and the two long grids 23 are connected to the two sides of the long flow guide cloth 22.

[0060] Specifically, the long flow guide cloth 22 of the embodiment is a double-sided channel flow guide cloth, which has a first flow guide channel 221 on both sides, and the two long grids 23 are connected to the two sides of the long flow guide cloth 22, which changes the single-sided channel of the long flow guide cloth 22 to a double-sided channel, which not only supports the single membrane 21, but also increases the flow guide groove 220, solves the problem of too long clean water flow channel in the channel, high back pressure and small transmembrane pressure difference, and can improve the flow under the same pressure, which is more suitable for application in the working condition of non-ultra-high pressure of household water purification, and is more suitable for the environment of longitudinal cutting long membrane.

[0061] The short flow guide cloth 24 of the embodiment has a second flow guide channel on both sides, and the number of short grids 25 is two, and the two short grids 25 are connected to the two sides of the short flow guide cloth 24.

[0062] Specifically, the two short grids 25 of the embodiment are connected to the two sides of the short flow guide cloth 24, and the short flow guide cloth 24 has a second flow guide channel on both sides, which not only plays the role of supporting the short grid 25 and the warp and weft of the short grid 25 to make the clean water turbulent, but also makes a part of the clean water flow in the second flow guide channel on both sides through the short flow guide cloth 24.

[0063] The single-sided channel flow guide cloth is converted into a double-sided channel flow guide cloth, and both sides are supported, which ensures that the support is easier to guide water and is more suitable for the concentrated flow of a large number of single membrane pieces 21 to the central pipe 40 after water production.

[0064] As shown in Figure 1 The single membrane piece 21, the long grid 23, and the long flow guide cloth 22 are mutually welded in the embodiment.

[0065] Specifically, the two groups of membrane pieces, grids, and flow guide cloths are mutually welded respectively or in a single group, that is, the single membrane piece 21, the long grid 23, and the long flow guide cloth 22 are mutually welded; the single membrane piece 21, the short grid 25, and the short flow guide cloth 24 are mutually welded. Or only one group is mutually welded.

[0066] In the actual production of the stepped side flow film, the stepped side flow film piece is very inconvenient to take and place when the single membrane piece 21 is actually taken and placed because the "upper part" end page membrane piece in a unit faces downward, is easily misaligned or adheres to the glue line 31, and the long grid 23 or the short grid 25 of the inner liner is not completely held, is easily deviated, and finally causes the film roll to be defective. By pre-welding the long flow guide cloth 22, the single membrane piece 21, and the long grid 23 together and pre-welding the short flow guide cloth 24, the single membrane piece 21, and the short grid 25 together, the disadvantages of the "upper part" being difficult to take and place when the stepped side flow film is rolled are solved, the film roll qualification rate and product stability are improved, the production efficiency is improved, and the effect of reducing process defects is achieved.

[0067] As shown in Figure 2 In the embodiment, each membrane piece unit 20 further includes an inner flow guide cloth 26, the inner flow guide cloth 26 is arranged in the clean water channel 102, and the inner flow guide cloth 26 is located between the outer sides of the two folded film parts 212 of each membrane piece unit 20.

[0068] Specifically, the inner flow guide cloth 26 is arranged in the clean water channel 102 formed between the outer sides of the two folded film parts 212 of each membrane piece unit 20 in the embodiment as a support material of the clean water channel 102.

[0069] As shown in Figure 1 The inner flow guide cloth 26 and the outer sides of the two folded film parts 212 are mutually welded in the embodiment.

[0070] Specifically, the inner flow guide cloth 26 in each membrane piece unit 20 and the folded film on both sides of the inner flow guide cloth 26 are fixed by ultrasonic welding in the embodiment, so as to avoid the movement of the inner flow guide cloth 26 and the deviation of the clean water channel 102 when the film is rolled.

[0071] AsFigure 1 and Figure 2 As shown in FIG. 1, the filter membrane assembly 100 of the present embodiment further comprises a plurality of outer flow guides 27, each of which is arranged in the purified water channel 102 and is inserted between the outer sides of the two long membrane portions 211 of the adjacent membrane sheet units 20.

[0072] Specifically, the outer flow guides 27 are arranged in the purified water channel 102 formed between the outer sides of the long membrane portions 211 of the two single membrane sheets 21 of the adjacent membrane sheet units 20, and the outer flow guides 27 serve as the support material of the purified water channel 102.

[0073] As shown in FIG. 1, the outer flow guides 27 of the present embodiment are welded to the outer sides of the two long membrane portions 211 of the adjacent membrane sheet units 20. Figure 1

[0074] Specifically, the long membrane portions 211 of the two single membrane sheets 21 of the adjacent membrane sheet units 20 on both sides of the outer flow guide 27 located in the middle of the purified water channel 102 are fixed by ultrasonic welding, so that the outer flow guide 27 does not move and deviate from the purified water channel 102 during the rolling of the filter membrane.

[0075] In the present embodiment, after the single membrane sheets 21, the long and short mesh nets 23 and 25, and the various types of short and long flow guides 24, 22, 26 and 27 are welded, the folded single membrane sheets 21, mesh nets and flow guides are sequentially stacked, and ultrasonic welding is performed at a position 5 mm ± 2 mm away from the edge of the filter membrane, so that the single membrane sheets 21, the various types of flow guides and the mesh nets are fixed in position. Because the end face of the filter membrane is generally cut off by about 10 mm after rolling to keep the end face flat, the welding points do not affect the final effect of the filter membrane. Then, the pretreated filter membrane assembly 100 is glued and rolled, and the filter membrane assembly 100 welded by ultrasonic welding does not deviate in position during rolling, so that the rolling qualification rate and the stability of the finished product are improved, and the production efficiency is also improved.

[0076] As shown in FIG. 1, the outer flow guides 27 of the present embodiment are welded to the outer sides of the two long membrane portions 211 of the adjacent membrane sheet units 20. Figure 1 and Figure 2 As shown in FIG. 1, the two single membrane sheets 21 in each membrane sheet unit 20 of the present embodiment are nanofiltration membranes; the two single membrane sheets 21 can also be reverse osmosis membranes, or one of the two single membrane sheets 21 can be a nanofiltration membrane and the other can be a reverse osmosis membrane.

[0077] ​Specifically, in the embodiment, when the two single membranes 21 in each membrane unit 20 are respectively a nanofiltration membrane and a reverse osmosis membrane, the nanofiltration membrane and the reverse osmosis membrane are overlapped to share one water inlet flow channel, so that the pollution of the surface of the reverse osmosis membrane can be effectively reduced, the attenuation of the service life of the reverse osmosis membrane can be slowed down, the service life of the nanofiltration membrane and the reverse osmosis membrane can be consistent, and the service life of the whole filtration membrane assembly 100 can be prolonged.

[0078] The nanofiltration membrane is mainly formed by alternately stacking positive and negative material membranes.

[0079] In the description of the utility model, it is understood that the position relationship indicated by the terms "upper", "lower" and the like is based on the position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the utility model.

[0080] Although the specific embodiments of the utility model are described above, those skilled in the art should understand that this is only an example, and the protection scope of the utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the utility model, and these changes and modifications all fall within the protection scope of the utility model.

Claims

1. A filtration membrane module, characterized by, The filter membrane assembly comprises a plurality of parallel stacked membrane sheet units, each of which has the same opening; each of the membrane sheet units comprises two stacked single membrane sheets, the same end of the two single membrane sheets being folded inward to form a long membrane part and a folded membrane part, the length of the long membrane part being greater than that of the folded membrane part; The folded membrane parts of the adjacent single membrane sheets in each of the membrane sheet units are connected to each other, and the long membrane parts of the adjacent single membrane sheets of adjacent membrane sheet units are connected to each other; the inner side of the single membrane sheet is a smooth surface, and the space between the smooth surface of the long membrane part and the smooth surface of the folded membrane part of each of the single membrane sheets forms a raw water channel; the space between the smooth surfaces of the long membrane parts of the abutting single membrane sheets of each of the membrane sheet units forms a waste water channel; and the space between the outer side surfaces of the two folded membrane parts of each of the membrane sheet units and the space between the outer side surfaces of the two long membrane parts of adjacent membrane sheet units form a purified water channel; Each of the membrane sheet units further comprises a long grid, a long flow guide cloth, a short grid and a short flow guide cloth; the long grid is connected to one side of the long flow guide cloth, and the long grid and the long flow guide cloth are located in the waste water channel and inserted into one of the raw water channels in each of the membrane sheet units; the short grid is connected to one side of the short flow guide cloth, and the short grid and the short flow guide cloth are located in the other raw water channel in each of the membrane sheet units.

2. The filtration membrane module of claim 1, wherein, Both sides of the long flow guide cloth have first flow guide channels, and the number of the long grids is two, and the two long grids are respectively connected to the two sides of the long flow guide cloth.

3. The filtration membrane module of claim 1, wherein, Both sides of the short flow guide cloth have second flow guide channels, and the number of the short grids is two, and the two short grids are respectively connected to the two sides of the short flow guide cloth.

4. The filtration membrane module of claim 1, wherein, The single membrane sheet, the long grid and the long flow guide cloth are welded to each other; And / or, the single membrane sheet, the short grid and the short flow guide cloth are welded to each other.

5. The filtration membrane module of claim 1, wherein, Each of the membrane sheet units further comprises an inner flow guide cloth, which is arranged in the purified water channel and located between the outer side surfaces of the two folded membrane parts of each of the membrane sheet units.

6. The filtration membrane module of claim 5, wherein, The inner flow guide cloth and the outer side surfaces of the two folded membrane parts are welded to each other.

7. The filtration membrane module of claim 1, wherein, The filter membrane assembly further comprises a plurality of outer flow guide cloths, each of which is arranged in the purified water channel and inserted between the outer side surfaces of the two long membrane parts of adjacent membrane sheet units.

8. The filtration membrane module of claim 7, wherein, The outer flow guide cloth and the outer side surfaces of the two long membrane parts of adjacent membrane sheet units are welded to each other.

9. The filtration membrane module of claim 1, wherein, The two single membrane sheets in each of the membrane sheet units are nanofiltration membranes; Or, the two single membrane sheets in each of the membrane sheet units are reverse osmosis membranes; Or, the two single membrane sheets in each of the membrane sheet units are respectively nanofiltration membranes and reverse osmosis membranes.

10. A filter characterized by, The filter comprises the filter membrane assembly according to any one of claims 1-9.

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