CN106237861B - Reverse osmosis membrane element, preparation method of reverse osmosis membrane element and filter element - Google Patents
Reverse osmosis membrane element, preparation method of reverse osmosis membrane element and filter element Download PDFInfo
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- CN106237861B CN106237861B CN201610834876.5A CN201610834876A CN106237861B CN 106237861 B CN106237861 B CN 106237861B CN 201610834876 A CN201610834876 A CN 201610834876A CN 106237861 B CN106237861 B CN 106237861B
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- 238000001223 reverse osmosis Methods 0.000 title claims abstract description 173
- 238000002360 preparation method Methods 0.000 title abstract description 8
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- 239000002351 wastewater Substances 0.000 claims abstract description 98
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- 238000007789 sealing Methods 0.000 abstract description 16
- 230000000694 effects Effects 0.000 abstract description 11
- 238000011084 recovery Methods 0.000 abstract description 7
- 239000002699 waste material Substances 0.000 description 14
- 230000004907 flux Effects 0.000 description 6
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D63/00—Apparatus in general for separation processes using semi-permeable membranes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/02—Reverse osmosis; Hyperfiltration ; Nanofiltration
- B01D61/025—Reverse osmosis; Hyperfiltration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/02—Reverse osmosis; Hyperfiltration ; Nanofiltration
- B01D61/08—Apparatus therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/02—Reverse osmosis; Hyperfiltration ; Nanofiltration
- B01D61/10—Accessories; Auxiliary operations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D63/00—Apparatus in general for separation processes using semi-permeable membranes
- B01D63/06—Tubular membrane modules
- B01D63/061—Manufacturing thereof
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D63/00—Apparatus in general for separation processes using semi-permeable membranes
- B01D63/06—Tubular membrane modules
- B01D63/062—Tubular membrane modules with membranes on a surface of a support tube
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2313/00—Details relating to membrane modules or apparatus
- B01D2313/04—Specific sealing means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2313/00—Details relating to membrane modules or apparatus
- B01D2313/08—Flow guidance means within the module or the apparatus
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2313/00—Details relating to membrane modules or apparatus
- B01D2313/10—Specific supply elements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2313/00—Details relating to membrane modules or apparatus
- B01D2313/12—Specific discharge elements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2313/00—Details relating to membrane modules or apparatus
- B01D2313/21—Specific headers, end caps
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/02—Non-contaminated water, e.g. for industrial water supply
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/14—Maintenance of water treatment installations
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- Chemical & Material Sciences (AREA)
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- Nanotechnology (AREA)
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Abstract
The invention discloses a reverse osmosis membrane element, a preparation method of the reverse osmosis membrane element and a filter element, wherein the reverse osmosis membrane element comprises: the device comprises a central pipe group, a plurality of reverse osmosis membrane groups and two sealing adhesive layers, wherein the central pipe group comprises a pure water pipe and a plurality of waste water pipes which are arranged at intervals, and the plurality of waste water pipes are distributed around the pure water pipe; each RO membrane set has a first part located inside the central tube set and a second part located outside the central tube set, and each waste water pipe and the pure water pipe are separated by the first part of one RO membrane set; a second portion of the plurality of reverse osmosis membrane modules forming a multi-layer membrane module surrounding the central tube bank; the two sealing glue layers are respectively arranged at two ends of the multiple reverse osmosis membrane groups in the length direction of the central tube group and are adhered to the multiple reverse osmosis membrane groups. The technical scheme of the invention can improve the recovery rate of raw water and achieve the effect of saving raw water.
Description
Technical Field
The invention relates to the technical field of reverse osmosis water purification, and particularly relates to a reverse osmosis membrane element, a preparation method of the reverse osmosis membrane element and a filter element.
Background
The reverse osmosis membrane element is also called roll type reverse osmosis membrane element, is a common element in water treatment technology, and generally comprises a central pipe with a plurality of holes, and a plurality of layers of reverse osmosis separation membranes and flow guide nets which are alternately stacked and coiled on the central pipe. The central tube is connected with the two ends of the shell through connectors. When the water purifier is used, raw water enters the shell from one end of the shell, a part of the raw water forms water with lower concentration under the action of a reverse osmosis membrane under the action of pressure, and the water flows out from one end or two ends of the central pipe after entering the central pipe, and the water can be called as produced water or pure water; the other part flows out from the other end of the shell and can be called waste water and concentrated water.
In the reverse osmosis membrane element in the prior art, after raw water is treated, a large part of raw water is discharged as wastewater, only a small part of raw water becomes pure water, particularly the reverse osmosis membrane element with large flux, the proportion of pure water in the raw water is relatively smaller, the raw water recovery rate is low, and the waste of the raw water is caused.
Disclosure of Invention
The invention mainly aims to provide a reverse osmosis membrane element, aiming at improving the recovery rate of raw water and achieving the effect of saving the raw water.
In order to achieve the above object, the present invention provides a reverse osmosis membrane element comprising: the device comprises a central pipe group, a plurality of reverse osmosis membrane units and two sealing adhesive layers, wherein the central pipe group comprises a pure water pipe and a plurality of waste water pipes which are arranged at intervals, and the waste water pipes are distributed around the pure water pipe; each of said RO membrane units having a first portion located inside said central tube group and a second portion located outside said central tube group, each of said waste water pipe and said plain water pipe being separated by a first portion of one of said RO membrane units; a second portion of the plurality of reverse osmosis membrane modules forming a multi-layer membrane module surrounding the central tube bank; the two sealing glue layers are respectively arranged at two ends of the multiple reverse osmosis membrane groups in the length direction of the central tube group and are adhered to the multiple reverse osmosis membrane groups.
Preferably, the sealant layer has a thickness of 1-2 mm.
Preferably, the sealant layer is formed by coating AB glue.
Preferably, the reverse osmosis membrane element further comprises a first end cover and a second end cover, wherein the first end cover and the second end cover are respectively sleeved at two ends of the central tube group and two ends of the multiple reverse osmosis membrane units and are respectively adhered and fixed with the corresponding sealing glue layers; wherein the first end cover is provided with a wastewater outlet and a pure water outlet; or the first end cover is provided with a wastewater outlet, and the second end cover is provided with a pure water outlet; the waste water pipe is communicated with the waste water outlet, and the pure water pipe is communicated with the pure water outlet.
Preferably, the wastewater discharge port and the pure water discharge port are both provided on the first end cap.
Preferably, the inner side of the first end cover is convexly provided with a plurality of first extending pipes communicated with the waste water discharge ports corresponding to the positions and the number of the waste water pipes, and the first extending pipes extend into the corresponding waste water pipes and are communicated with the waste water discharge ports and the corresponding waste water pipes; and a second extension pipe communicated with the pure water outlet is convexly arranged on the inner side of the first end cover corresponding to the position of the pure water pipe, extends into the pure water pipe and is communicated with the pure water outlet and the pure water pipe.
Preferably, the inner side of the second end cover is convexly provided with a plurality of first positioning bulges corresponding to the positions and the number of the waste water pipes, and the first positioning bulges extend into the corresponding waste water pipes; the inner side of the second end cover is convexly provided with a second positioning bulge corresponding to the position of the pure water pipe, and the second positioning bulge extends into the pure water pipe.
Preferably, a reinforcing structure is convexly arranged on the end face, bonded by the sealant layer, of the first end cover or/and the second end cover.
Preferably, the reinforcing structure includes annular reinforcing ribs arranged in the circumferential direction and strip-shaped reinforcing ribs arranged in the radial direction.
Preferably, each reverse osmosis membrane group comprises a reverse osmosis membrane, a water inlet diversion net and a pure water diversion net; the front surface of the reverse osmosis membrane of each reverse osmosis membrane group is folded inwards, and the second parts of the reverse osmosis membrane groups are overlapped and wound around the central pipe group together along the circumferential direction; a water inlet flow passage is formed between the interlayers on the front sides of the same reverse osmosis membrane; a water production flow channel is formed between the reverse side interlayers of two adjacent reverse osmosis membranes; the water inlet flow guide net and the waste water pipe are positioned in the water inlet flow passage, and the pure water flow guide net is positioned in the water production flow passage.
The invention also provides a preparation method of the reverse osmosis membrane element, which comprises the following steps: step S1 of extending a first portion of a plurality of said ro membrane modules into said central tube bank such that each of said waste water tubes and said plain water tubes are separated by a first portion of one of said ro membrane modules;
step S2, surrounding a second part of the reverse osmosis membrane groups around the central tube group to obtain a semi-finished component;
and step S3, coating waterproof glue on the two ends of the reverse osmosis membrane group of the semi-finished product assembly in the length direction of the central tube group and drying.
The invention also provides another preparation method of the reverse osmosis membrane element, which comprises the following steps: step S1 of extending a first portion of a plurality of said ro membrane modules into said central tube bank such that each of said waste water tubes and said plain water tubes are separated by a first portion of one of said ro membrane modules;
step S2, surrounding a second part of the reverse osmosis membrane groups around the central tube group to obtain a semi-finished component;
and step S3', waterproof glue is coated on the bottom walls of the inner sides of the first end cover and the second end cover, the coating range avoids the pure water discharge port and the waste water discharge port, and the first end cover and the second end cover are respectively covered at two ends of the semi-finished product assembly and dried.
The invention also provides a filter element, which comprises a shell, a waterway converter and a reverse osmosis membrane element; the reverse osmosis membrane element comprises a central tube group, a plurality of reverse osmosis membrane units and two sealing adhesive layers, wherein the central tube group comprises a pure water pipe and a plurality of waste water pipes which are arranged at intervals, and the waste water pipes are distributed around the pure water pipe; each of said RO membrane units having a first portion located inside said central tube group and a second portion located outside said central tube group, each of said waste water pipe and said plain water pipe being separated by a first portion of one of said RO membrane units; a second portion of the plurality of reverse osmosis membrane modules forming a multi-layer membrane module surrounding the central tube bank; the two sealing glue layers are respectively arranged at two ends of the multiple reverse osmosis membrane groups in the length direction of the central tube group and are adhered to the multiple reverse osmosis membrane groups; the reverse osmosis membrane element is accommodated in the shell; the water path converter is provided with two independent water paths, wherein one water path is communicated with the waste water pipes, and the other water path is communicated with the pure water pipe.
The central pipe group of the reverse osmosis membrane element in the technical scheme of the invention comprises a pure water pipe and a plurality of waste water pipes surrounding the pure water pipe; each waste water pipe of the reverse osmosis membrane element corresponds to one reverse osmosis membrane group, so that multi-membrane coiling can be realized, the number of flow channels can be increased, the raw water flux can be improved, and the problem that part of reverse osmosis membranes cannot achieve the filtering purpose due to overlong reverse osmosis membranes and insufficient osmotic pressure is solved; the two ends of the reverse osmosis membrane group are respectively sealed by the two sealing glue layers, so that water is prevented from flowing out or flowing in from the two ends of the reverse osmosis membrane group, a raw water channel for feeding water from the lateral sides of the outer sides of the multiple reverse osmosis membrane groups and discharging waste water from the middle waste water pipe can be formed; when the reverse osmosis membrane element is used, raw water flows in through a side flow, a flow channel is narrowed, the water inlet area is reduced, a low-thickness water inlet flow guide net can be adopted in the reverse osmosis membrane group, the water inlet area is continuously reduced, the flow is greatly increased, the contact time of the raw water and the reverse osmosis membrane can be prolonged, and the raw water recovery rate is improved; meanwhile, because the raw water inlet area is reduced, the surface water flow speed of the permeation membrane of the reverse osmosis membrane group can be increased, so that the surface concentration polarization of the reverse osmosis membrane can be reduced, the pollution speed of the reverse osmosis membrane element is reduced, the raw water recovery rate is favorably improved, the waste problem of the raw water is improved, and the effect of saving the raw water is achieved.
Drawings
FIG. 1 is a schematic view of the construction of one embodiment of a reverse osmosis membrane element of the present invention;
FIG. 2 is a cross-sectional view of the reverse osmosis membrane element of FIG. 1 taken along A-A';
FIG. 3 is a schematic diagram of the construction of the center tube bank of the reverse osmosis membrane element of FIG. 1;
FIG. 4 is a schematic diagram of the construction of another embodiment of a reverse osmosis membrane element of the present invention;
FIG. 5 is a cross-sectional view of the reverse osmosis membrane element of FIG. 4 taken along line B-B';
FIG. 6 is an enlarged view of a portion of FIG. 5 at C;
FIG. 7 is an enlarged view of a portion of FIG. 5 at D;
FIG. 8 is a schematic view of the first end cap of the reverse osmosis membrane element of FIG. 4;
FIG. 9 is a flow diagram of one embodiment of a method of making a reverse osmosis membrane element of the present invention;
FIG. 10 is a flow diagram of another embodiment of a method of making a reverse osmosis membrane element of the present invention;
fig. 11 is an exploded view of a filter cartridge according to an embodiment of the present invention.
The reference numbers illustrate:
the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The invention provides a reverse osmosis membrane element.
Referring to fig. 1 to 3, in the embodiment of the present invention, the reverse osmosis membrane device 700 includes a central tube group 100, a multi-sheet reverse osmosis membrane group 200, and two sealant layers 300, wherein the central tube group 100 includes a plain water pipe 110 and a plurality of waste water pipes 120 spaced apart from each other, and the plurality of waste water pipes 120 are arranged around the plain water pipe 110; each of the RO membrane units 200 has a first portion located inside the center tube group 100 and a second portion located outside the center tube group 100, and each of the waste water pipe 120 and the plain water pipe 110 is partitioned by the first portion of one of the RO membrane units 200; a second portion of a plurality of the ro membrane modules 200 form a multi-layered membrane module surrounding the center tube group 100; the two sealant layers 300 are respectively disposed at two ends of the multiple reverse osmosis membrane groups 200 in the length direction of the central tube group 100, and are adhered to the multiple reverse osmosis membrane groups 200.
The central tube group 100 of the reverse osmosis membrane element 700 of the present invention comprises a plain water tube 110 and a plurality of waste water tubes 120 surrounding the plain water tube 110; each waste water pipe 120 of the reverse osmosis membrane element 700 corresponds to one reverse osmosis membrane group 200, so that multi-membrane coiling can be realized, the number of flow channels can be increased, the raw water flux can be improved, and the problem that part of reverse osmosis membranes cannot achieve the filtering purpose due to overlong reverse osmosis membranes and insufficient osmotic pressure is solved; the two ends of the reverse osmosis membrane set 200 are respectively sealed by the two sealing adhesive layers 300 (it should be noted that the sealing adhesive layers 300 cannot block the inner pipe orifices of the pure water pipe 110 or the waste water pipe 120), so as to prevent water from flowing out or in from the two ends of the reverse osmosis membrane set 200, and a raw water channel for flowing water from the outer side of the multiple reverse osmosis membrane sets 200 and discharging waste water from the middle waste water pipe 120 can be formed; when the reverse osmosis membrane element 700 is used, raw water flows in through a side flow, a flow channel is narrowed, the water inlet area is reduced, a low-thickness water inlet flow guide net can be adopted in the reverse osmosis membrane group 200, the water inlet area is continuously reduced, the flow is greatly increased, the contact time of the raw water and a reverse osmosis membrane can be prolonged, and the raw water recovery rate is improved; meanwhile, because the raw water inlet area is reduced, the water flow speed on the surface of the permeable membrane of the reverse osmosis membrane set 200 can be increased (when the water inlet flux is constant, the relation between the water inlet flux Q and the water flow speed V is Q/S, wherein S is the water inlet area, specifically, S is Ld, L is the length of the membrane at the water inlet end, d is the section thickness, the side flow mainly reduces L, and in addition, the thickness d is naturally reduced by using a small water inlet flow guide net), the concentration polarization on the surface of the reverse osmosis membrane can be reduced, the pollution speed of the reverse osmosis membrane element 700 is reduced, the raw water recovery rate is favorably improved, the waste problem of raw water is improved, and the effect of saving raw water is achieved.
Referring to fig. 3, in the central tube set 100, a pure water inlet hole (not shown) communicating with the inner channel of the pure water tube 110 is formed on the circumferential wall of the pure water tube 110; the peripheral wall of each waste pipe 120 is provided with a waste water inlet hole 121 communicated with the internal channel of the waste pipe 120. The pure water and the wastewater enter the corresponding passages through the pure water inlet hole and the wastewater inlet hole 121, respectively. The number of the reverse osmosis membrane groups 200 is determined by the specific number of the waste water pipes 120, and the size of the pure water pipe 110 is also determined, specifically, one reverse osmosis membrane group 200 is arranged corresponding to one waste water pipe 120, the more the waste water pipes 120 are, the more the number of the reverse osmosis membrane groups 200 is, the larger the flux of the corresponding reverse osmosis membrane element 700 is, and the larger the size of the pure water pipe 110 is correspondingly. The specific number, shape and shape of the waste water pipes 120 and the corresponding pure water pipes 110 may be according to specific embodiments of the present invention and may be set according to actual circumstances.
Each reverse osmosis membrane module 200 includes a reverse osmosis membrane (not shown), a water inlet flow guide net (not shown), and a pure water flow guide net (not shown); the water inlet guide net and the pure water guide net may be respectively disposed on both sides of the reverse osmosis membrane, raw water flows on the front side of the reverse osmosis membrane, and pure water permeates from the front side of the reverse osmosis membrane to the back side of the reverse osmosis membrane under the action of osmotic pressure, and pure water is generated on the back side of the reverse osmosis membrane and flows to the pure water pipe 110 under the guide action of the pure water guide net. The reverse osmosis membrane can be folded to ensure that the front surface is adjacent to the front surface and the back surface is adjacent to the back surface, so that unnecessary contact is avoided, and the pure water is prevented from being polluted; in actual operation, the reverse osmosis membrane can be folded inwards on the front side or on the back side when folded, and the reverse osmosis membrane can be reasonably selected according to actual conditions. In this embodiment, the reverse osmosis membrane of each reverse osmosis membrane group 200 is folded inwards, and the second parts of the reverse osmosis membrane groups 200 are overlapped and wound around the central pipe group 100 together along the circumferential direction; a water inlet flow passage is formed between the interlayers on the front sides of the same reverse osmosis membrane; a water production flow channel is formed between the reverse side interlayers of two adjacent reverse osmosis membranes; the water inlet diversion net and the wastewater pipe 120 are positioned in the water inlet runner, and the pure water diversion net is positioned in the water production runner. At this time, the water inlet channel and the water production channel are independent and thoroughly isolated from each other, so that the water inlet flow guide net of each reverse osmosis membrane group 200 can be effectively ensured not to be contacted with the reverse sides of the pure water pipe 110 and the reverse osmosis membranes of other reverse osmosis membrane groups 200; the pure water diversion net of each reverse osmosis membrane group 200 is not in contact with the front surfaces of the waste water pipe 120 and the reverse osmosis membranes of other reverse osmosis membrane groups 200; raw water flows only in the water inlet channel and is finally discharged by the waste water pipe 120, and pure water flows only in the water production channel and is finally discharged by the pure water pipe 110, so that the pollution of the pure water is avoided, and the purification effect is ensured. In order to smoothly lead out the pure water, in this embodiment, the other sides of the water generating flow passage except the side near the pure water pipe 110 may be sealed so that the water generating flow passage has only a pure water outlet toward the pure water pipe 110; at the moment, the water producing flow channel forms a membrane bag with three sealed sides and one opened side, the membrane bag opening faces the pure water pipe 110, and pure water in the membrane bag can only flow towards the pure water pipe 110; the raw water produces pure water after the action of the reverse osmosis membrane, and the pure water is formed in the membrane bag and flows into the bag opening to enter the pure water pipe 110. During actual operation, can realize sealing through rolling up when membrane operation, the sealed position at both ends can also utilize two sealing glue layers 300 to carry out the secondary seal simultaneously, and then realizes better sealed effect.
The main function of the sealing adhesive layer 300 is to perform secondary sealing on both ends of the membrane bag, so as to prevent water from entering the reverse osmosis membrane stack 200 from both ends of the length direction of the reverse osmosis membrane element 700, and therefore, the thickness of the sealing adhesive layer 300 cannot be too thin, and in this embodiment, the thickness of the sealing adhesive layer 300 is preferably 1-2mm, so that a better sealing effect can be achieved, and unnecessary waste can not be caused. The sealant layer 300 is formed by coating a waterproof glue, which may be an AB glue commonly used in the preparation of the reverse osmosis membrane element 700; the main component of the AB adhesive for adhesion and sealing comprises at least one of epoxy resin, acrylic modified epoxy resin or polyurethane, and the AB adhesive can achieve good adhesion effect and waterproof effect.
In order to better position the reverse osmosis membrane stack 200 and the central tube stack 100, please refer to fig. 4 and 5, in another embodiment of the present invention, the reverse osmosis membrane element 700' further includes a first end cap 400 and a second end cap 500, wherein the first end cap 400 and the second end cap 500 are respectively sleeved on two ends of the central tube stack 100 and the multiple reverse osmosis membrane stacks 200 and are respectively adhered and fixed with the corresponding sealant layers 300; wherein the first end cap 400 is provided with a wastewater discharge port and a pure water discharge port; alternatively, the first end cap 400 is provided with a wastewater discharge port, and the second end cap 500 is provided with a pure water discharge port; the waste water pipe 120 is connected to the waste water outlet, and the pure water pipe 110 is connected to the pure water outlet. The two ends of the central pipe group 100 and the reverse osmosis membrane group 200 are respectively clamped through the first end cover 400 and the second end cover 500 to be positioned, and meanwhile, a pure water discharge port and a waste water discharge port are arranged on the first end cover 400/the second end cover 500, so that a flow channel communicated with a pipeline corresponding to the central pipe group 100 is formed, and water flow is convenient to collect and discharge. The waste water discharge port and the pure water discharge port may be provided at the first end cap 400 or the second end cap 500 as needed, in this embodiment, for convenience of the waterway. Referring to fig. 5 to 7, in this embodiment, in order to simplify the water path, the second end cap 500 is not provided with a water outlet, the wastewater outlet and the pure water outlet are both disposed on the first end cap 400, when the second end cap 500 is in sealing fit with the central tube set 100, pure water in the pure water and wastewater in the wastewater tube 120 do not flow toward the second end cap 500 to be discharged, but when the sealing effect between the second end cap 500 and the central tube is not good, the pure water and wastewater may flow toward the second end cap 500 to be discharged into the housing of the filter element, thereby affecting the purification efficiency; to avoid this, in the present embodiment, the one-end nozzle of the deionized water pipe 110 remote from the first end cap 400 is blocked off to allow the deionized water to flow toward the deionized water discharge port of the first end cap 400; the end of the waste pipe 120 away from the first end cap 400 is blocked to allow waste water to flow towards the first end cap 400. At the moment, the flow direction of the pure water is fixed, the pure water can be reliably collected, and after plugging, the flow direction of the waste water is fixed, so that the waste water can be reliably collected. In practical use, the reverse osmosis membrane element 700' is generally vertically disposed, and at this time, the corresponding pure water pipe 110 and the plurality of waste water pipes 120 are also vertically disposed, the first end cap 400 is disposed above, the second end cap 500 is disposed below, the lower port of the pure water pipe 110 is blocked, the lower ports of the plurality of waste water pipes 120 are blocked, and pure water and waste water are collected from the upper end, so that water flow is uniform, and pipeline design is facilitated.
Referring to fig. 5 and 6, in order to realize the butt joint of the waste pipe 120 and the waste water outlet, a plurality of first extension pipes 410 communicating with the waste water outlet are convexly arranged at positions and numbers corresponding to the waste pipe 120 on the inner side of the first end cover 400, and the first extension pipes 410 extend into the corresponding waste pipe 120 to communicate the waste water outlet and the waste pipe 120; specifically, the one end of the first stretching-in pipe 410 stretches into the waste water pipe 120 to be communicated with the waste water pipe 120, the other end of the first stretching-in pipe 410 is communicated with the waste water discharge port, the communication of a water channel is reliably realized, meanwhile, the first stretching-in pipe 410 also has a positioning function, the alignment of the first end cover 400 and the central pipe group 100 can be assisted, and the structural compactness and the reliability of the reverse osmosis membrane element 700' are improved. In order to connect the pure water discharge port to the pure water discharge port, a second insertion pipe 420 for connecting the pure water discharge port to the pure water discharge port is protruded at a position corresponding to the pure water pipe 110 inside the first cap 400, and the second insertion pipe 420 is inserted into the pure water pipe 110 to connect the pure water discharge port to the pure water pipe 110. The second penetration pipe 420 may have a similar function and effect to the first penetration pipe 410, and thus will not be described in detail.
To facilitate the second end cap 500 installation; referring to fig. 5 and 7, in the present embodiment, a plurality of first positioning protrusions 510 are convexly disposed at positions and numbers of the inner side of the second end cap 500 corresponding to the waste 120, and the first positioning protrusions 510 extend into the waste 120; the inner side of the second end cap 500 is convexly provided with a second positioning protrusion 520 corresponding to the deionized water pipe 110, and the second positioning protrusion 520 extends into the deionized water pipe 110. The first positioning protrusion 510 is engaged with the waste pipe 120, and the second positioning protrusion 520 is engaged with the plain water pipe 110, so that the alignment operation of the second end cap 500 can be simplified, and the central pipe group 100 and the second end cap 500 are connected by the first positioning protrusion 510 and the second positioning protrusion 520, so that the structural compactness and reliability of the entire reverse osmosis membrane element 700' can be further improved.
In order to bond the first end cap 400 or/and the second end cap 500 with the corresponding sealant layer 300 more tightly, referring to fig. 8, in this embodiment, a reinforcing structure 430 is convexly disposed on the bonded end surface of the sealant layer 300 of the first end cap 400 or/and the second end cap 500. The reinforcing structure 430 reinforces the strength of the first and/or second end caps 400 and/or 500, on the one hand, and increases the contact area of the first and/or second end caps 400 and/or 500 with the corresponding sealant layer 300 while protruding into the sealant layer 300, on the other hand, thereby improving the adhesion tightness and preventing the first and/or second end caps 400 and/or 500 from being separated from the corresponding sealant layer 300. In the present embodiment, taking the first end cap 400 as an example, the reinforcing structure 430 includes an annular reinforcing rib 431 disposed along the circumferential direction of the first end cap 400 and a bar-shaped reinforcing rib 432 disposed along the radial direction of the first end cap 400. The quantity of annular strengthening rib 431 can be a plurality of, and a plurality of annular strengthening ribs 431 are concentric ring-shaped and arrange, and the quantity of bar strengthening rib 432 also can be a plurality of, and a plurality of bar strengthening ribs 432 are radially arranged, and the reinforcement is carried out to first end cap 400 in radial and circumference, increases first end cap 400 and the bonding reliability of the sealant layer 300 that corresponds simultaneously.
Referring to fig. 9, and as will be understood in conjunction with fig. 1-3, the present invention also provides a method of preparing a reverse osmosis membrane element 700, the method comprising:
step S1, a first part of the plurality of ro membrane modules 200 is inserted into the center tube group 100, so that each of the waste water pipe 120 and the pure water pipe 110 is separated by the first part of one of the ro membrane modules 200. The first part of each reverse osmosis membrane set 200 is inserted between the pure water pipe 110 and the waste water pipe 120 in the central pipe set 100, the front and the back of the reverse osmosis membrane are used for distinguishing the flow passages, the back of the reverse osmosis membrane generating pure water is adjacent to the pure water pipe 110, and the front of the reverse osmosis membrane generating waste water is connected with the waste water pipe 120, so that the isolation of the pure water and the raw water is realized. In this step, generally, the film bag is formed by one-time gluing, and the requirement for the precision of the gluing is reduced by setting the secondary sealing of the sealing glue layer 300, so that the gluing line for gluing is allowed to expand, and the effective film area is greatly increased.
Step S2, surrounding the central tube group 100 with a second part of the plurality of reverse osmosis membrane groups 200, to obtain a semi-finished module. A plurality of pages of the second part of the reverse osmosis membrane group 200 are wound around the central tube group 100 by winding, bending back and forth and the like by taking the central tube group 100 as the center, so that a plurality of flow channels are formed around the central tube group 100 to provide flow channels for the flow of raw water and pure water; of course, when the water inlet channel and the water outlet channel are arranged in a surrounding manner, attention needs to be paid to the isolation of the corresponding water inlet channel and the corresponding water outlet channel.
Step S3, coating waterproof glue on the two ends of the reverse osmosis membrane set 200 of the semi-finished assembly in the length direction of the central tube group 100 and drying. Compared with the traditional preparation method, the method has the greatest characteristic that after the membrane rolling operation of the step S2 is completed, waterproof glue needs to be coated on the reverse osmosis membrane set 200 again to form the sealing glue layer 300, so that the flow channel is limited, and the secondary sealing of the membrane bag is realized.
For the reverse osmosis membrane element 700 'provided with the end caps, the first end cap 400 and the second end cap 500 may be capped to the corresponding positions after step S3 to manufacture the corresponding reverse osmosis membrane element 700'; referring to fig. 10, as will be understood in conjunction with fig. 4 to 8, in another embodiment, after step S2, the following operations are also performed: step S3', coating waterproof glue on the inner bottom walls of the first end cap 400 and the second end cap 500, wherein the coating range avoids the pure water outlet and the waste water outlet, and the first end cap 400 and the second end cap 500 are respectively covered on the two ends of the semi-finished assembly and dried; a corresponding reverse osmosis membrane element 700' is produced. Since, in the case of the reverse osmosis membrane element 700 'having the end cap, when the waterproof glue is applied by the operation of the step S3', the application range is easily determined and the waterproof glue is adhered to the first end cap 400 and the second end cap 500 more closely; therefore, in this embodiment, it is preferable that after step S2, a reverse osmosis membrane element 700 'is prepared according to the operation of step S3'.
Referring to fig. 11, the present invention further provides a filter element, which includes a housing 800, a waterway converter 900 and a reverse osmosis membrane element 700 ' (in this embodiment, the reverse osmosis membrane element 700 ' has membrane elements of a first end cap 400 and a second end cap 500), and the specific structure of the reverse osmosis membrane element 700 ' refers to the above embodiments. The housing 800 comprises a body 810 and a cover 820 covering the body 810, and the reverse osmosis membrane element 700 is accommodated in the housing 800; the waterway converter 900 is provided with two independent waterways, wherein one waterway is communicated with the plurality of waste water pipes 120, and the other waterway is communicated with the plain water pipe 110.
It should be noted that the technical solutions of the embodiments of the present invention can be combined with each other, but must be based on the realization of the technical solutions by those skilled in the art, and when the technical solutions are contradictory or can not be realized, the combination of the technical solutions should be considered to be absent and not to be within the protection scope of the present invention.
The above description is only for the preferred embodiment of the present invention and is not intended to limit the scope of the present invention, and all equivalent structural changes made by using the contents of the present specification and the drawings, or any other related technical fields, are included in the scope of the present invention.
Claims (12)
1. A reverse osmosis membrane element, comprising:
the central pipe group comprises a pure water pipe and a plurality of waste water pipes arranged at intervals, and the waste water pipes are distributed around the pure water pipe;
a plurality of reverse osmosis membrane groups, each of said reverse osmosis membrane groups having a first portion located inside said central tube group and a second portion located outside said central tube group, each of said waste water tubes and said plain water tubes being separated by a first portion of one of said reverse osmosis membrane groups; a second portion of the plurality of reverse osmosis membrane modules forming a multi-layer membrane module surrounding the central tube bank;
the two sealing adhesive layers are respectively arranged at the two ends of the multiple reverse osmosis membrane groups in the length direction of the central tube group and are adhered to the multiple reverse osmosis membrane groups;
each reverse osmosis membrane group comprises a reverse osmosis membrane, a water inlet flow guide net and a pure water flow guide net, wherein the water inlet flow guide net and the pure water flow guide net are respectively arranged on the front surface and the back surface of the reverse osmosis membrane;
the front surface of the reverse osmosis membrane of each reverse osmosis membrane group is folded inwards, and the second parts of the reverse osmosis membrane groups are overlapped and wound around the central pipe group together along the circumferential direction; a water inlet flow passage is formed between the interlayers on the front sides of the same reverse osmosis membrane; a water production flow channel is formed between the reverse side interlayers of two adjacent reverse osmosis membranes; the water inlet flow guide net and the waste water pipe are positioned in the water inlet flow passage, and the pure water flow guide net is positioned in the water production flow passage;
the other sides of the water production flow passage except the side close to the pure water pipe are sealed in a closed mode, so that the water production flow passage only has a pure water outlet facing the pure water pipe.
2. The reverse osmosis membrane element of claim 1, wherein the sealant layer has a thickness of 1-2 mm.
3. The reverse osmosis membrane element of claim 1, wherein the sealant layer is formed by coating with an AB glue.
4. The reverse osmosis membrane element of claim 1, further comprising a first end cap and a second end cap, wherein the first end cap and the second end cap are respectively sleeved at two ends of the central tube group and the plurality of reverse osmosis membrane element groups and are respectively fixed with the corresponding sealant layers in an adhering manner;
wherein the first end cover is provided with a wastewater outlet and a pure water outlet; or the first end cover is provided with a wastewater outlet, and the second end cover is provided with a pure water outlet; the waste water pipe is communicated with the waste water outlet, and the pure water pipe is communicated with the pure water outlet.
5. The reverse osmosis membrane element of claim 4, wherein the waste water outlet and the pure water outlet are both disposed on the first end cap.
6. The reverse osmosis membrane element of claim 5,
a plurality of first extension pipes communicated with the waste water discharge ports are convexly arranged on the inner side of the first end cover corresponding to the positions and the number of the waste water pipes, extend into the corresponding waste water pipes and are communicated with the waste water discharge ports and the corresponding waste water pipes;
and a second extension pipe communicated with the pure water outlet is convexly arranged on the inner side of the first end cover corresponding to the position of the pure water pipe, extends into the pure water pipe and is communicated with the pure water outlet and the pure water pipe.
7. The reverse osmosis membrane element of claim 5,
a plurality of first positioning bulges are convexly arranged on the inner side of the second end cover corresponding to the positions and the number of the waste water pipes, and the first positioning bulges extend into the corresponding waste water pipes;
the inner side of the second end cover is convexly provided with a second positioning bulge corresponding to the position of the pure water pipe, and the second positioning bulge extends into the pure water pipe.
8. The reverse osmosis membrane element of claim 4, wherein the bonded end faces of the sealant layers of the first end cap or/and the second end cap are provided with a reinforcing structure in a protruding manner.
9. The reverse osmosis membrane element of claim 8, wherein the reinforcing structure comprises circumferentially disposed annular ribs and radially disposed strip ribs.
10. A method of producing a reverse osmosis membrane element according to any one of claims 1, 2 and 3, comprising:
step S1 of extending a first portion of a plurality of said ro membrane modules into said central tube bank such that each of said waste water tubes and said plain water tubes are separated by a first portion of one of said ro membrane modules;
step S2, surrounding a second part of the reverse osmosis membrane groups around the central tube group to obtain a semi-finished component;
and step S3, coating waterproof glue on the two ends of the reverse osmosis membrane group of the semi-finished product assembly in the length direction of the central tube group and drying.
11. A method of producing a reverse osmosis membrane element according to any one of claims 4 to 9, comprising:
step S1 of extending a first portion of a plurality of said ro membrane modules into said central tube bank such that each of said waste water tubes and said plain water tubes are separated by a first portion of one of said ro membrane modules;
step S2, surrounding a second part of the reverse osmosis membrane groups around the central tube group to obtain a semi-finished component;
and step S3', waterproof glue is coated on the bottom walls of the inner sides of the first end cover and the second end cover, the coating range avoids the pure water discharge port and the waste water discharge port, and the first end cover and the second end cover are respectively covered at two ends of the semi-finished product assembly and dried.
12. A filter cartridge comprising a housing, a waterway converter, and a reverse osmosis membrane element of any one of claims 1-9; the reverse osmosis membrane element is accommodated in the shell; the water path converter is provided with two independent water paths, wherein one water path is communicated with the waste water pipes, and the other water path is communicated with the pure water pipe.
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| CN112403277B (en) * | 2017-01-05 | 2022-04-15 | 佛山市顺德区美的饮水机制造有限公司 | End cover, spiral roll formula reverse osmosis membrane element and water purifier |
| CN110618660B (en) * | 2018-06-19 | 2021-03-23 | 石家庄格力电器小家电有限公司 | Production control method and device of reverse osmosis membrane filter element, storage medium and water purifier |
| CN109502701A (en) * | 2018-12-29 | 2019-03-22 | 苏州曙之洁环保科技有限公司 | The reverse osmosis membrane filter element of life of product can be extended |
| CN112076629A (en) * | 2019-06-14 | 2020-12-15 | 佛山市顺德区美的饮水机制造有限公司 | Filter core end cover assembly and filter core |
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