Reverse osmosis membrane assembly, filter element and water purification device
By wrapping the scale-retardant and antibacterial functional membrane layer on the outside of the reverse osmosis membrane, the problems of inconvenience and high cost in the prior art are solved, and convenient and efficient scale-retardant and antibacterial effects are achieved, and production costs are reduced.
Patent Information
- Application Number
- CN202422258860.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-13
- Publication Date
- 2025-07-25
- Estimated Expiration
- 2034-09-13
AI Technical Summary
In the prior art, the reverse osmosis membrane filter element requires the addition of special functional devices such as scale inhibition and antibacterial on the front or rear filter element. It is inconvenient to operate and high cost, making it difficult to effectively inhibit the deposition of trace amounts of insoluble salts.
The functional membrane layer is wrapped on the outside of the reverse osmosis membrane, including scale-resistance and/or antibacterial layers, forming a complete reverse osmosis membrane element without the need to add special functional devices to the front or rear filter element.
It improves operational convenience, reduces mass production costs, effectively inhibits the deposition of trace insoluble salts and bacterial growth, and extends the service life of the reverse osmosis membrane.
Smart Images
Figure CN223144486U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of water purification, and particularly relates to a reverse osmosis membrane module, a filter element and a water purification device. Background Art
[0002] With the prominent problems of urban water safety, water purifiers have been more and more widely used to remove pollutants in tap water. The core component of a water purifier is a filter element, and the filter element mostly uses a reverse osmosis membrane element to filter raw water, so as to utilize its semi-permeability to filter out impurities and pollutants such as bacteria, calcium and magnesium ions, heavy metals, etc., and ensure the quality of the effluent.
[0003] However, under the high-pressure environment of the reverse osmosis membrane element, cations (such as Ca 2+ , Mg 2+ , Ba 2+ , etc.) and anions (such as CO3 2- , HCO 3- , PO4 3- , SO4 2- , OH - , etc.) contained in the raw water combine to form trace insoluble salts such as carbonates, bicarbonates, sulfates, phosphates, etc., which will form deposits on the surface of the reverse osmosis membrane, resulting in problems such as a decrease in the membrane flux of the reverse osmosis membrane, a decrease in the desalination efficiency, an increase in the osmotic pressure, scratches on the membrane surface, and even membrane blockage. When the above problems occur, cleaning or replacing the reverse osmosis membrane is the only solution, but the cleaning and replacement of the reverse osmosis membrane are beyond the scope of operation of ordinary users, and frequent cleaning and replacement operations also increase the user's usage cost.
[0004] Based on the above situation, in recent years, researchers have begun to use physical methods, electrochemical methods, chemical methods, etc. to inhibit the formation of trace insoluble salt deposits on the surface of the reverse osmosis membrane; thus, it is necessary to add devices with special functions such as scale inhibition and bacteriostasis to the pre-filter element or post-filter element of the corresponding reverse osmosis membrane filter element, which is inconvenient to operate and may require new molds during mass production, resulting in high costs. Summary of the Utility Model
[0005] The main object of the utility model is to propose a reverse osmosis membrane module, aiming to solve the problems in the prior art that it is necessary to add special function devices to the pre-filter element or post-filter element of the reverse osmosis membrane filter element to inhibit the formation of trace insoluble salt deposits on the surface of the reverse osmosis membrane, which is inconvenient to operate and has high costs.
[0006] To achieve the above object, the reverse osmosis membrane module proposed by the utility model includes:
[0007] A central tube, through-flow holes are formed on the periphery of the central tube;
[0008] The reverse osmosis membrane body is wound around the central tube and communicated with the flow-through holes.
[0009] The functional membrane layer is coated on the outer surface of the reverse osmosis membrane body; the functional membrane layer at least includes a scale inhibitor layer and / or an antibacterial layer.
[0010] The protective membrane layer is coated on the outer surface of the functional membrane layer.
[0011] In one embodiment, the reverse osmosis membrane body has a wastewater outlet end, and the wastewater outlet end is arranged at the functional membrane layer.
[0012] In one embodiment, the reverse osmosis membrane module further includes a first end cap, the first end cap is connected to the upper end of the central tube, and the upper end portions of the reverse osmosis membrane body, the functional membrane layer, and the protective membrane layer are docked with the first end cap; and / or, the reverse osmosis membrane module further includes a second end cap, the second end cap is connected to the lower end of the central tube, and the lower end portions of the reverse osmosis membrane body, the functional membrane layer, and the protective membrane layer are docked with the second end cap.
[0013] In one embodiment, the reverse osmosis membrane module further includes an annular seal, and the annular seal is sleeved on the reverse osmosis membrane body.
[0014] In one embodiment, the first end cap has a first flange, the first flange encloses a first cavity, the first end cap is provided with a first connection through hole, the first connection through hole is communicated with the first cavity, the upper end of the central tube penetrates through the first connection through hole, the upper end portion of the reverse osmosis membrane body is received in the first cavity, and the upper side end faces of the functional membrane layer and the protective membrane layer are aligned with the lower side end face of the first flange.
[0015] In one embodiment, the second end cap has a second flange, the second flange encloses a second cavity, the second end cap is provided with a second connection through hole, the second connection through hole is communicated with the second cavity, the lower end of the central tube penetrates through the second connection through hole, the lower end portion of the reverse osmosis membrane body is received in the second cavity, and the lower side end faces of the functional membrane layer and the protective membrane layer are aligned with the upper side end face of the second flange.
[0016] In one embodiment, the outer side wall of the reverse osmosis membrane body is attached to the inner side wall of the annular seal; the lower side end faces of the functional membrane layer and the protective membrane layer are aligned with the upper side end face of the annular seal, or the upper side end faces of the functional membrane layer and the protective membrane layer are aligned with the lower side end face of the annular seal.
[0017] In one embodiment, the functional film layer includes a scale-inhibiting grid, and a scale inhibitor is loaded on the surface of the scale-inhibiting grid.
[0018] In one embodiment, the specific surface area of the scale-inhibiting grid ranges from 800 to 1500 m 2 / g.
[0019] In one embodiment, the scale inhibitor is selected from any one of inorganic polyphosphates, organic phosphates and esters, polycarboxylic acids, sulfonic acid group copolymers, polyaspartic acid, polyepoxysuccinic acid, S-carboxyethyl thiosuccinic acid, maleic anhydride, ammonium carbonate, polyepoxysuccinic acid, imidazoline, propenyl polyethoxy carboxylate, acrylic acid, sodium propenyl sulfonate, acrylamide, sodium epoxysuccinate, sodium hypophosphite, 2-acrylamide-2-methylpropanesulfonic acid.
[0020] In one embodiment, the functional film layer is welded or pasted on the reverse osmosis membrane body.
[0021] The present utility model also provides a filter element, which includes the reverse osmosis membrane module as described above.
[0022] The present utility model also provides a water purification device, which includes the filter element as described above.
[0023] The technical solution of the present utility model adds a functional film layer with special functions such as scale inhibition and bacteriostasis between the reverse osmosis membrane body and the protective film layer. In this way, functions such as scale inhibition and bacteriostasis can be directly added inside the filter element corresponding to the reverse osmosis membrane body, without adding devices for realizing special functions such as scale inhibition and bacteriostasis on the pre-filter element or post-filter element, thereby improving the operation convenience and without the need to open a new mold, and further reducing the cost during mass production. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on the structures shown in these drawings without creative efforts.
[0025] Figure 1 It is an expanded structural schematic diagram of the first embodiment of the reverse osmosis membrane module provided by the present utility model;
[0026] Figure 2 It is a three-dimensional structural schematic diagram of the first embodiment of the reverse osmosis membrane module provided by the present utility model;
[0027] Figure 3Schematic perspective view of the second embodiment of the reverse osmosis membrane module provided by the present utility model without the first end cap installed;
[0028] Figure 4 Schematic cross-sectional view of the second embodiment of the reverse osmosis membrane module provided by the present utility model with the first end cap installed;
[0029] Figure 5 Schematic cross-sectional view of the third embodiment of the reverse osmosis membrane module provided by the present utility model with the first end cap and the second end cap installed;
[0030] Figure 6 Front view structure diagram of the fourth embodiment of the reverse osmosis membrane module provided by the present utility model without the annular seal installed;
[0031] Figure 7 Front view structure diagram of the fourth embodiment of the reverse osmosis membrane module provided by the present utility model with the annular seal installed.
[0032] Explanation of the reference numerals in the drawings:
[0033] 1. Central tube; 11. Flow-through hole; 2. Reverse osmosis membrane body; 3. Functional membrane layer; 4. Protective membrane layer; 5. First end cap; 51. First flange; 6. Second end cap; 7. Annular seal.
[0034] The realization, functional features and advantages of the object of the present utility model will be further described in conjunction with the embodiments with reference to the drawings. Detailed implementation manners
[0035] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts belong to the scope of protection of the present utility model.
[0036] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present utility model, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.
[0037] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the utility model.
[0038] As the issue of urban water safety becomes more prominent, water purifiers are increasingly being used to remove pollutants from tap water. The core component of a water purifier is the filter element, which mostly uses a reverse osmosis membrane element to filter raw water, using its semi-permeability to remove bacteria, calcium and magnesium ions, heavy metals and other impurities and pollutants to ensure the quality of the water.
[0039] However, under the high pressure environment of the reverse osmosis membrane element, the cations contained in the raw water (such as Ca 2+ Mg 2+ , Ba 2+ etc.) and anions (such as CO3 2- , HCO 3- PO4 3- 、SO4 2- OH - The carbonates, bicarbonates, sulfates, phosphates, etc. generated by the combination of the reverse osmosis membrane and the reverse osmosis membrane will form trace amounts of insoluble salts on the surface of the reverse osmosis membrane, causing problems such as reduced membrane flux, decreased desalination efficiency, increased osmotic pressure, scratches on the membrane surface, and even membrane blockage. When the above problems occur, cleaning or replacing the reverse osmosis membrane is the only solution, but the difficulty of cleaning and replacing the reverse osmosis membrane has exceeded the operational range of ordinary users, and frequent cleaning and replacement operations also increase the user's cost of use.
[0040] Based on the above situation, in recent years, scientific researchers have begun to use physical, electrochemical and chemical methods to inhibit the formation of trace insoluble salt deposits on the surface of the reverse osmosis membrane; this requires adding devices with special functions such as scale inhibition and antibacterial function to the pre-filter or post-filter of the corresponding reverse osmosis membrane filter element, which is inconvenient to operate and may require new molds for mass production, which is costly.
[0041] To solve the above problems, the present utility model provides a reverse osmosis membrane module. Before the reverse osmosis membrane element is wound and wrapped with an outer protective film, a functional membrane layer with special functions such as scale inhibition and antibacterial is wrapped around the outer layer of the reverse osmosis membrane element, and then the outer protective film is wrapped. This can directly add functions such as scale inhibition and antibacterial in the filter element corresponding to the reverse osmosis membrane element, without adding special functional devices in the pre-filter or post-filter, thereby improving the operation convenience and reducing the cost.
[0042] Please refer to Figure 1 and Figure 2 , the reverse osmosis membrane module provided by the present utility model includes:
[0043] A central tube 1, with a through-flow hole 11 provided on the circumferential side of the central tube 1;
[0044] A reverse osmosis membrane body 2, wound around the central tube 1 and communicated with the through-flow hole 11;
[0045] A functional membrane layer 3, covering the outer surface of the reverse osmosis membrane body 2; the functional membrane layer 3 at least includes a scale inhibition layer and / or an antibacterial layer;
[0046] A protective film layer 4, covering the outer surface of the functional membrane layer 3.
[0047] The reverse osmosis membrane body 2 is the core component for realizing reverse osmosis. It is an artificial semi-permeable membrane with certain characteristics made by simulating biological semi-permeable membranes, generally made of polymer materials such as cellulose acetate membranes, aromatic polyhydrazide membranes, aromatic polyamide membranes, etc. The reverse osmosis membrane body 2 is mainly divided into two categories: asymmetric membranes and homogeneous membranes. In this embodiment, the reverse osmosis membrane body 2 is wound around the central tube 1 to form a spiral wound reverse osmosis membrane element. The reverse osmosis membrane body 2 forms a membrane bag structure with three sides bonded and one side open, and the opening of the membrane bag structure is arranged towards the central tube 1; during the actual working process, raw water can be supplied from the raw water end at one end of the reverse osmosis membrane body 2. Part of the supplied raw water becomes pure water by passing through the reverse osmosis membrane under high pressure and enters the membrane bag structure. This part of the pure water entering the membrane bag structure can enter the central tube 1 through the through-flow hole 11 and is finally discharged outwards from the central tube 1; while the remaining raw water that fails to enter the membrane bag structure constitutes the concentrated wastewater, and this part of the wastewater will be discharged outwards from the wastewater end at the other end of the reverse osmosis membrane body 2.
[0048] After the above reverse osmosis membrane body 2 is wound on the central tube 1, the functional membrane layer 3 is continuously wrapped on the outer surface of the reverse osmosis membrane body 2, so that the functional membrane layer 3 can be in waterway communication with the reverse osmosis membrane body 2. In one embodiment, the functional membrane layer 3 includes a scale inhibition layer, and the scale inhibitor on the scale inhibition layer can react with cations (such as Ca 2+ , Mg 2+ etc.) and anions (such as CO3 2- , HCO 3-Chelate, crystallize, and cause lattice distortion (etc.), thereby preventing the deposition of poorly soluble salts formed by these ions on the surface of the reverse osmosis membrane body 2, playing a scale inhibition role in the water body finally flowing to the wastewater end, and avoiding scale formation at the wastewater end. In another embodiment, the functional membrane layer 3 includes an antibacterial layer containing chemical components. Through contact with the water body in the reverse osmosis membrane body 2, these chemical components can inhibit and kill bacteria and other microorganisms that are difficult to filter by the reverse osmosis membrane body 2 itself, effectively inhibiting the growth and reproduction of bacteria, microorganisms, algae, etc. on the surface of the reverse osmosis membrane body 2, reducing the risk of biological contamination, and maintaining the hygiene and filtration performance of the reverse osmosis membrane body 2. In other embodiments, the functional membrane layer 3 may further include other membrane layers with special functions, and this special function may refer to any function that is difficult to achieve by the reverse osmosis membrane body 2 itself, so as to improve the water purification effect, maintain the filtration performance of the reverse osmosis membrane body 2, extend the service life of the reverse osmosis membrane body 2, etc., which will not be listed one by one here. It can be understood that the functional membrane layer 3 can simultaneously include the above-mentioned scale inhibition layer, antibacterial layer, and other special function membrane layers; at this time, the scale inhibition layer, antibacterial layer, and other special function membrane layers can be used as separate membrane layers and sequentially wrapped on the surface of the reverse osmosis membrane body 2, or integrated into a complete membrane layer and then wrapped on the surface of the reverse osmosis membrane body 2 to simultaneously achieve scale inhibition, antibacterial, and other corresponding special effects, which will not be specifically limited here.
[0049] After the functional membrane layer 3 is completely coated on the reverse osmosis membrane body 2, a protective membrane layer 4 can be further wrapped on the outer surface of the functional membrane layer 3 to form a complete reverse osmosis membrane element, and the protective membrane layer 4 plays a protective role for the reverse osmosis membrane body 2 and the functional membrane layer 3 to ensure its service life.
[0050] It can be seen that in this embodiment, a functional membrane layer 3 with special functions such as scale inhibition and antibacterial is added between the reverse osmosis membrane body 2 and the protective membrane layer 4. In this way, functions such as scale inhibition and antibacterial can be directly added inside the filter element corresponding to the reverse osmosis membrane body 2, without adding devices for realizing special functions such as scale inhibition and antibacterial on the pre-filter element or post-filter element, thereby improving the operation convenience and not requiring new molds, and further reducing the cost during mass production.
[0051] Optionally, referring to Figure 1 and Figure 2 , the functional membrane layer 3 is welded or pasted on the reverse osmosis membrane body 2; in this way, a firm connection between the functional membrane layer 3 and the reverse osmosis membrane body 2 can be achieved through a convenient and feasible method, ensuring the structural stability of the overall reverse osmosis membrane element and enabling it to efficiently complete functions such as filtration, scale inhibition, and antibacterial.
[0052] Optionally, referring to Figure 1 and Figure 2 , the reverse osmosis membrane body 2 has a wastewater outlet end (not shown in the figure), and the wastewater outlet end is arranged at the functional membrane layer 3.
[0053] In practical applications, the wastewater outlet end of the reverse osmosis membrane body 2 is the area where fouling is most severe, and bacteria, microorganisms, and algae are most likely to grow at the wastewater outlet end of the reverse osmosis membrane body 2. Based on this, in this embodiment, the wastewater outlet end is arranged at the functional membrane layer 3, so that the functional membrane layer 3 can be used to more specifically inhibit the formation of deposition of poorly soluble salts and the growth of bacteria, microorganisms, and algae near the wastewater outlet end, maximizing the scale and bacteria inhibition efficiency.
[0054] Optionally, referring to Figures 3 to 5 , the reverse osmosis membrane module further includes a first end cap 5, and the first end cap 5 is connected to the upper end of the central tube 1. The upper end portions of the reverse osmosis membrane body 2, the functional membrane layer 3, and the protective membrane layer 4 are docked with the first end cap 5; and / or, the reverse osmosis membrane module further includes a second end cap 6, and the second end cap 6 is connected to the lower end of the central tube 1. The lower end portions of the reverse osmosis membrane body 2, the functional membrane layer 3, and the protective membrane layer 4 are docked with the second end cap 6.
[0055] Optionally, referring to Figure 6 and Figure 7 , the reverse osmosis membrane module further includes an annular seal 7, and the annular seal 7 is sleeved on the reverse osmosis membrane body 2.
[0056] In practical applications, as shown in Figure 4 , only the first end cap 5 can be arranged at the upper end portion of the reverse osmosis membrane body 2, or only the second end cap 6 can be arranged at the lower end portion of the reverse osmosis membrane body 2. Also, as shown in Figure 5 , the first end cap 5 and the second end cap 6 can be arranged at the upper and lower end portions of the reverse osmosis membrane body 2 respectively; and when neither the first end cap 5 nor the second end cap 6 is arranged on the reverse osmosis membrane body 2, an annular seal 7 can also be sleeved on the reverse osmosis membrane body 2 as shown in Figure 7 . The above solutions can be flexibly selected according to actual needs and are not limited here. By arranging the first end cap 5, the second end cap 6 or the annular seal 7, the reverse osmosis membrane body 2 and the functional membrane layer 3 can be limited and fixed axially, and can also cooperate with the protective membrane layer 4 to encapsulate the reverse osmosis membrane body 2 and the functional membrane layer 3 to form a complete reverse osmosis membrane element, so as to maintain the overall structural stability and make the reverse osmosis membrane element more convenient to be installed as a module inside the filter element.
[0057] Optionally, referring to Figures 3 to 5 , the first end cap 5 has a first flange 51, and the first flange 51 encloses a first cavity (not shown in the figure). The first end cap 5 is provided with a first connection through hole (not shown in the figure), and the first connection through hole communicates with the first cavity. The upper end of the central tube 1 passes through the first connection through hole, and the upper end portion of the reverse osmosis membrane body 2 is received in the first cavity. The upper side end faces of the functional membrane layer 3 and the protective membrane layer 4 are aligned with the lower side end face of the first flange 51.
[0058] Optionally, referring to Figures 3 to 5 , the second end cap 6 has a second flange (not shown in the figure), the second flange encloses and forms a second cavity (not shown in the figure), the second end cap 6 is provided with a second connection through hole (not shown in the figure), the second connection through hole communicates with the second cavity, the lower end of the central tube 1 passes through the second connection through hole, the lower end portion of the reverse osmosis membrane body 2 is accommodated in the second cavity, and the lower side end surfaces of the functional membrane layer 3 and the protective film layer 4 are aligned with the upper side end surface of the second flange.
[0059] Specifically, taking the reverse osmosis membrane module including the first end cap 5 and the second end cap 6 as an example, the two side end portions of the reverse osmosis membrane body 2 are respectively accommodated in the first cavity of the first end cap 5 and the second cavity of the second end cap 6, and the inner diameter of the first cavity and the inner diameter of the second cavity are adapted to the outer diameter of the reverse osmosis membrane body 2. In this way, the first end cap 5 and the second end cap 6 can play a good limiting and fixing role on the reverse osmosis membrane body 2 in all directions. When the surface of the reverse osmosis membrane body 2 is coated with the functional membrane layer 3 and the protective film layer 4, if the same method is used to limit and fix the functional membrane layer 3 and the protective film layer 4, then the two side end portions of the functional membrane layer 3 and the two side end portions of the protective film layer 4 also need to be accommodated in the first cavity and the second cavity. At this time, it is necessary to increase the inner diameter of the first cavity and the inner diameter of the second cavity, which is extremely inconvenient to operate. And for mass production, it means that the first end cap 5 and the second end cap 6 need to re-open the mold, which will lead to an increase in cost.
[0060] Based on this problem, as Figure 5 shown, in this embodiment, the width of the functional membrane layer 3 in the axial direction and the width of the protective film layer 4 in the axial direction are correspondingly shortened, so that the width of the functional membrane layer 3 and the width of the protective film layer 4 are shorter than the width of the reverse osmosis membrane body 2 in the axial direction, and there are intervals between the two side end surfaces of the functional membrane layer 3 and the two side end surfaces of the protective film layer 4 and the two side end surfaces of the reverse osmosis membrane body 2. In this way, positions for the first end cap 5 and the second end cap 6 to be sleeved can be reserved at the two side end portions of the reverse osmosis membrane body 2; when the first end cap 5 is sleeved on the upper end portion of the reverse osmosis membrane body 2, the upper side end surfaces of the functional membrane layer 3 and the protective film layer 4 can be flush with the lower side end surface of the first flange 51; and when the second end cap 6 is sleeved on the lower end portion of the reverse osmosis membrane body 2, the lower side end surfaces of the functional membrane layer 3 and the protective film layer 4 can be flush with the upper side end surface of the second flange. Based on the above settings, the functional membrane layer 3 can be added to the reverse osmosis membrane body 2 without increasing the inner diameters of the first cavity and the second cavity, thereby improving the operation convenience and avoiding a large increase in production cost.
[0061] It can be understood that when the reverse osmosis membrane module only includes the first end cap 5, as Figure 3 and Figure 4As shown, at this time, only the upper end faces of the functional film layer 3 and the protective film layer 4 can be set to have a spacing from the upper end face of the reverse osmosis membrane body 2, while the lower end faces of the functional film layer 3 and the protective film layer 4 are flush with the lower end face of the reverse osmosis membrane body 2; when the reverse osmosis membrane module only includes the second end cap 6, only the lower end faces of the functional film layer 3 and the protective film layer 4 can be set to have a spacing from the lower end face of the reverse osmosis membrane body 2, while the upper end faces of the functional film layer 3 and the protective film layer 4 are flush with the upper end face of the reverse osmosis membrane body 2.
[0062] Optionally, referring to Figure 6 and Figure 7 , the outer sidewall of the reverse osmosis membrane body 2 is fitted with the inner sidewall of the annular seal 7; the lower end faces of the functional film layer 3 and the protective film layer 4 are flush with the upper end face of the annular seal 7, or the upper end faces of the functional film layer 3 and the protective film layer 4 are flush with the lower end face of the annular seal 7.
[0063] This embodiment corresponds to the scheme of encapsulating the reverse osmosis membrane body 2 with the annular seal 7. Specifically, after the annular seal 7 is sleeved on the reverse osmosis membrane body 2, the annular seal 7 can be moved along the axial direction of the reverse osmosis membrane body 2 to a preset position as needed; the functional film layer 3 and the protective film layer 4 can be correspondingly arranged above or below the annular seal 7. When the functional film layer 3 and the protective film layer 4 are arranged above the annular seal 7, as Figure 6 and Figure 7 shown, the width of the functional film layer 3 in the axial direction and the width of the protective film layer 4 in the axial direction can be shortened, so that the lower end faces of the functional film layer 3 and the protective film layer 4 are flush with the upper end face of the annular seal 7, while the upper end faces of the functional film layer 3 and the protective film layer 4 are flush with the upper end face of the reverse osmosis membrane body 2; when the functional film layer 3 and the protective film layer 4 are arranged below the annular seal 7, the width of the functional film layer 3 in the axial direction and the width of the protective film layer 4 in the axial direction can be shortened, so that the upper end faces of the functional film layer 3 and the protective film layer 4 are flush with the lower end face of the annular seal 7, while the lower end faces of the functional film layer 3 and the protective film layer 4 are flush with the lower end face of the reverse osmosis membrane body 2.
[0064] Based on the above settings, the inner cavity of the annular seal 7 only needs to accommodate the reverse osmosis membrane body 2, and does not need to accommodate the functional film layer 3 and the protective film layer 4. Therefore, when the functional film layer 3 is added to the reverse osmosis membrane module, it is not necessary to increase the inner cavity diameter of the annular seal 7, thus avoiding a large increase in production costs.
[0065] Optionally, referring to Figures 1 to 7, the functional film layer 3 includes a scale inhibitor grid (not shown in the figure), and the surface of the scale inhibitor grid is loaded with a scale inhibitor; wherein, the loading method of the scale inhibitor may include bonding, coating to form a coating, etc. By loading the scale inhibitor on the scale inhibitor grid, the scale inhibitor can be stably released, thus avoiding the problem of unstable scale inhibitor concentration caused by water flow impact during the water purification process, and ensuring that the scale inhibitor can react with the ions in the water flow evenly and efficiently to play a scale inhibition role. Preferably, the specific surface area of the scale inhibitor grid ranges from 800 to 1500 m 2 / g.
[0066] Optionally, the scale inhibitor is selected from any one of inorganic polyphosphates, organic phosphates and esters, polycarboxylic acids, sulfonic acid group copolymers, polyaspartic acid, polyepoxysuccinic acid, S-carboxyethyl thiosuccinic acid, maleic anhydride, ammonium carbonate, polyepoxysuccinic acid, imidazoline, allyl polyethoxy carboxylate, acrylic acid, sodium allyl sulfonate, acrylamide, sodium epoxysuccinate, sodium hypophosphite, 2-acrylamide-2-methylpropanesulfonic acid.
[0067] Please refer to Figures 1 to 7 , the present invention also provides a filter element, including the reverse osmosis membrane module in any of the above embodiments.
[0068] In this embodiment, for the specific structure of the reverse osmosis membrane module, reference can be made to the above embodiments. Since the filter element in this embodiment adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated here one by one.
[0069] Please refer to Figures 1 to 7 , the present invention also provides a water purification device, including the filter element in any of the above embodiments.
[0070] In this embodiment, for the specific structure of the filter element, reference can be made to the above embodiments. Since the water purification device in this embodiment adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated here one by one.
[0071] The above is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structural transformation made under the technical concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied to other related technical fields, is included in the patent protection scope of the present invention.
Claims
1. A reverse osmosis membrane module, characterized in that, Comprising: A central tube, with flow-through holes provided on the circumferential side of the central tube; A reverse osmosis membrane body, wound around the central tube and communicating with the flow-through holes; A functional membrane layer, coated on the outer surface of the reverse osmosis membrane body; the functional membrane layer at least includes a scale inhibitor layer and / or an antibacterial layer; A protective membrane layer, coated on the outer surface of the functional membrane layer.
2. The reverse osmosis membrane module according to claim 1, characterized in that, The reverse osmosis membrane body has a waste water outlet end, and the waste water outlet end is arranged at the functional membrane layer.
3. The reverse osmosis membrane module according to claim 1, wherein, The reverse osmosis membrane module further includes a first end cap, the first end cap is connected to the upper end of the central tube, and the upper end portions of the reverse osmosis membrane body, the functional membrane layer, and the protective membrane layer are docked with the first end cap; and / or, the reverse osmosis membrane module further includes a second end cap, the second end cap is connected to the lower end of the central tube, and the lower end portions of the reverse osmosis membrane body, the functional membrane layer, and the protective membrane layer are docked with the second end cap; Alternatively, the reverse osmosis membrane module further includes an annular seal, and the annular seal is sleeved on the reverse osmosis membrane body.
4. The reverse osmosis membrane module according to claim 3, characterized in that, The first end cap has a first flange, the first flange encloses a first concave cavity, the first end cap is provided with a first connection through hole, the first connection through hole communicates with the first concave cavity, the upper end of the central tube passes through the first connection through hole, the upper end portion of the reverse osmosis membrane body is received in the first concave cavity, and the upper side end surfaces of the functional membrane layer and the protective membrane layer are aligned with the lower side end surface of the first flange; And / or, the second end cap has a second flange, the second flange encloses a second concave cavity, the second end cap is provided with a second connection through hole, the second connection through hole communicates with the second concave cavity, the lower end of the central tube passes through the second connection through hole, the lower end portion of the reverse osmosis membrane body is received in the second concave cavity, and the lower side end surfaces of the functional membrane layer and the protective membrane layer are aligned with the upper side end surface of the second flange.
5. The reverse osmosis membrane module according to claim 3, wherein, The outer side wall of the reverse osmosis membrane body is attached to the inner side wall of the annular seal; the lower side end surfaces of the functional membrane layer and the protective membrane layer are aligned with the upper side end surface of the annular seal, or the upper side end surfaces of the functional membrane layer and the protective membrane layer are aligned with the lower side end surface of the annular seal.
6. The reverse osmosis membrane module according to claim 1, wherein, The functional membrane layer includes a scale inhibitor grid, and a scale inhibitor is loaded on the surface of the scale inhibitor grid.
7. The reverse osmosis membrane module according to claim 6, wherein, The specific surface area of the scale inhibitor grid ranges from 800 to 1500 m2 / g; And / or, the scale inhibitor is selected from any one of inorganic polyphosphates, organic phosphates and esters, polycarboxylic acids, sulfonic acid group copolymers, polyaspartic acid, polyepoxysuccinic acid, S-carboxyethyl thiosuccinic acid, maleic anhydride, ammonium carbonate, imidazoline, allyl polyethoxy carboxylate, acrylic acid, sodium allyl sulfonate, acrylamide, sodium epoxysuccinate, sodium hypophosphite, 2-acrylamide-2-methylpropanesulfonic acid.
8. The reverse osmosis membrane module according to any one of claims 1 to 7, characterized in that, The functional membrane layer is welded or pasted on the reverse osmosis membrane body.
9. A filter element, characterized in that, Comprising the reverse osmosis membrane module according to any one of claims 1 to 8.
10. A water purification device, characterized in that, Comprising the filter element according to claim 9.