CN116020273A - Method for manufacturing roll-type reverse osmosis membrane element, roll-type reverse osmosis membrane element and water purifier - Google Patents
Method for manufacturing roll-type reverse osmosis membrane element, roll-type reverse osmosis membrane element and water purifier Download PDFInfo
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- CN116020273A CN116020273A CN202211502193.1A CN202211502193A CN116020273A CN 116020273 A CN116020273 A CN 116020273A CN 202211502193 A CN202211502193 A CN 202211502193A CN 116020273 A CN116020273 A CN 116020273A
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- 239000012528 membrane Substances 0.000 title claims abstract description 260
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 242
- 238000001223 reverse osmosis Methods 0.000 title claims abstract description 119
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 16
- 238000000034 method Methods 0.000 title claims description 16
- 238000005096 rolling process Methods 0.000 claims abstract description 36
- 239000003292 glue Substances 0.000 claims abstract description 11
- 239000004744 fabric Substances 0.000 claims description 22
- 238000000746 purification Methods 0.000 claims description 20
- 238000004026 adhesive bonding Methods 0.000 claims description 2
- 238000007789 sealing Methods 0.000 claims description 2
- 230000010287 polarization Effects 0.000 abstract description 7
- 239000012141 concentrate Substances 0.000 description 11
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000003373 anti-fouling effect Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
- Y02A20/131—Reverse-osmosis
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Abstract
The invention provides a manufacturing method of a coiled reverse osmosis membrane element, the coiled reverse osmosis membrane element and a water purifier, and belongs to the technical field of water purifier design, the manufacturing method comprises the following steps: the front side of the first reverse osmosis membrane is folded into a first membrane and a second membrane which are bounded by folded edges; the front surface of the second reverse osmosis membrane is folded into a third membrane and a fourth membrane which are bounded by folded edges, the rolled length of the first membrane is longer than that of the second membrane, and the rolled length of the fourth membrane is longer than that of the third membrane; placing the folded second reverse osmosis membrane on the folded first reverse osmosis membrane, enabling the back surface of the second membrane to be opposite to the back surface of the third membrane, and applying glue between the back surface of the second membrane and the back surface of the third membrane to form a first pure water flow channel with a pure water outlet facing to one side of the folded edge; a rolling step and a raw water runner inlet forming step. The invention can improve the flow velocity of the membrane surface at the side of the concentrated water, slow down the concentration polarization at the side of the concentrated water, improve the anti-pollution performance of the reverse osmosis membrane and prolong the service life of the reverse osmosis membrane filter element.
Description
Technical Field
The invention belongs to the technical field of water purification device design, and particularly relates to a manufacturing method of a coiled reverse osmosis membrane element, the coiled reverse osmosis membrane element and a water purifier.
Background
The coiled reverse osmosis membrane element forms a water purifying element by coiling the water inlet separation net, the reverse osmosis membrane and the pure water diversion cloth on the central water production pipe. By utilizing the osmosis function of the reverse osmosis membrane, water molecules in raw water permeate the reverse osmosis membrane under the condition of pressurization, pure water is formed by converging on the pure water side, raw water gradually forms concentrated water on the concentrated water side, and finally, the concentrated water flows out from a concentrated water outlet, and pure water flows out from a pure water outlet. Along with the flow of raw water in the raw water flow channel towards the concentrated water outlet, the flow velocity of the water film surface in the raw water flow channel is smaller and smaller, the flow velocity of the water film surface on the concentrated water side is minimum, the concentration polarization is the most serious, and the fouling is most easily caused, namely the concentration polarization phenomenon of the reverse osmosis membrane element on the concentrated water side is obvious, so that the service life of the reverse osmosis membrane element is reduced.
Disclosure of Invention
Therefore, the invention provides a manufacturing method of a coiled reverse osmosis membrane element, the coiled reverse osmosis membrane element and a water purifier, which can solve the technical problem that the service life of the reverse osmosis membrane element is reduced due to filter element blockage caused by low membrane surface flow velocity on the concentrate side of the reverse osmosis membrane element in the prior art.
In order to solve the above problems, the present invention provides a method for manufacturing a rolled reverse osmosis membrane element, comprising the following steps:
the method comprises the steps of forming a reverse osmosis membrane water purifying unit, namely folding the front surface of a first reverse osmosis membrane, wherein the folded first reverse osmosis membrane is divided into a first membrane and a second membrane by taking a folded edge as a boundary, and the rolling length of the first membrane is longer than that of the second membrane; folding the front surface of a second reverse osmosis membrane, wherein the folded second reverse osmosis membrane is divided into a third membrane and a fourth membrane by taking a folded edge as a boundary, and the rolled length of the fourth membrane is longer than that of the third membrane; placing the folded second reverse osmosis membrane on the folded first reverse osmosis membrane, enabling the back surface of the second membrane to be opposite to the back surface of the third membrane, and applying glue between the back surface of the second membrane and the back surface of the third membrane to form a first pure water flow channel with a pure water outlet facing to one side of the folded edge; sizing the reverse side of the fourth membrane;
a rolling step of rolling the formed reverse osmosis membrane water purification unit on the outer circumference side of the central tube;
and a raw water runner inlet forming step, wherein the end part area corresponding to the second membrane in the rolled reverse osmosis membrane water purifying unit is glued and sealed to form a raw water inlet of the raw water runner.
In some embodiments, during the rolling step,
before the formed reverse osmosis membrane water purification unit is rolled on the outer circumferential side of the central tube, the reverse osmosis membrane water purification unit further comprises a first pure water diversion cloth which is rolled on the outer circumferential wall of the central tube for at least one circle and then is unfolded, the formed reverse osmosis membrane water purification unit is laminated on one side of the first pure water diversion cloth which faces the central tube, and the back surface of the first membrane is attached to the first pure water diversion cloth.
In some embodiments of the present invention, in some embodiments,
a second pure water diversion cloth is inserted in the first pure water flow passage; and/or the raw water flow passage part formed between the front surface of the first membrane and the front surface of the second membrane is a first raw water flow passage, and a first water inlet grid is inserted in the first raw water flow passage; and/or the raw water flow passage part formed between the front surface of the third membrane and the front surface of the fourth membrane is a second raw water flow passage, and a second water inlet grid is inserted in the second raw water flow passage.
In some embodiments of the present invention, in some embodiments,
the rolled length of the first water inlet grid is not shorter than the rolled length of the first membrane; and/or, the rolled length of the second water inlet grid is longer than the rolled length of the third membrane.
In some embodiments of the present invention, in some embodiments,
the rolled length of the second pure water diversion cloth is longer than that of the second membrane.
In some embodiments of the present invention, in some embodiments,
the rolling length of the first membrane is equal to that of the fourth membrane and is L1, the rolling length of the second membrane is equal to that of the third membrane and is L2, and L2/3 is more than or equal to 1/3 and L1 is more than or equal to 3/4.
In some embodiments of the present invention, in some embodiments,
the coiling length of the raw water inlet is L0, and L0/L2 is more than or equal to 1/10 and less than or equal to 1/2.
In some embodiments of the present invention, in some embodiments,
the wall of the central tube is provided with water passing holes, in the rolling step,
the pure water outlet of the reverse osmosis membrane water purification unit faces one side of the central tube; or, the concentrated water outlet of the raw water flow channel of the reverse osmosis membrane water purifying unit faces to one side of the central tube.
In some embodiments of the present invention, in some embodiments,
the reverse osmosis membrane water purification unit is provided with a plurality of layers which are laminated, and the pure water outlets respectively provided in the reverse osmosis membrane water purification units are respectively corresponding to each other.
The invention also provides a coiled reverse osmosis membrane element which is manufactured by adopting the manufacturing method of the coiled reverse osmosis membrane element.
The invention also provides a water purifier which comprises the coiled reverse osmosis membrane element.
According to the manufacturing method of the rolled reverse osmosis membrane element, the rolled reverse osmosis membrane element and the water purifier, provided by the invention, the parts between the front surfaces of the first diaphragm and the second diaphragm and between the front surfaces of the third diaphragm and the fourth diaphragm, which correspond to the inlets of the raw water flow channels, are water inlet areas of the raw water flow channels, the areas between the front surfaces of the second diaphragm and the third diaphragm, which are longer than the first diaphragm and the fourth diaphragm, correspond to water outlet areas of the raw water flow channels, the lengths of the second diaphragm and the third diaphragm formed by flanging are smaller than those of the first diaphragm and the fourth diaphragm, so that the first raw water flow channel and the second raw water flow channel are combined into a third raw water flow channel at the back, the size of the raw water flow channel at the concentrate side is reduced, the flow rate of the membrane at the concentrate side is further improved, the concentration polarization at the concentrate side of the reverse osmosis membrane is slowed down, the possibility of filter element fouling and blocking caused by the membrane surface low flow rate is reduced, the anti-fouling performance of the reverse osmosis membrane is improved, and the service life of the reverse osmosis membrane filter element is prolonged.
Drawings
FIG. 1 is a schematic diagram showing steps of a method for manufacturing a roll-type reverse osmosis membrane element according to an embodiment of the present invention;
fig. 2 is a schematic view of a rolled reverse osmosis membrane element in a laminated and unfolded state before a reverse osmosis membrane water purifying unit is rolled up according to an embodiment of the present invention, in which a folded position of a corresponding reverse osmosis membrane is exaggerated for showing a difference in raw water flow paths, and it can be understood that in actual operation, the folded position has a small thickness;
fig. 3 is a schematic perspective view of the rolled reverse osmosis membrane element in fig. 2 in a rolling process, wherein the first pure water guiding cloth in fig. 2 is omitted;
FIG. 4 is a schematic view of the coiled reverse osmosis element of FIG. 2 at the pure water flow path, with parts omitted;
FIG. 5 is a schematic view of the structure of the roll type reverse osmosis unit of FIG. 2 at the raw water flow path, with parts omitted, arrows showing the flow direction of raw water;
FIG. 6 is a schematic perspective view of the rolled reverse osmosis membrane element of FIG. 1 after fabrication;
FIG. 7 is a schematic view showing a rolled reverse osmosis membrane element in a laminated and unrolled state before a multi-layered reverse osmosis membrane water purification unit is rolled up according to another embodiment of the present invention;
FIG. 8 is a schematic view showing a rolled reverse osmosis membrane element in a laminated and unrolled state before a reverse osmosis membrane water purification unit is rolled up according to still another embodiment of the present invention;
fig. 9 is a schematic view showing a rolled reverse osmosis membrane element in a laminated and unrolled state before a multi-layered reverse osmosis membrane water purification unit is wound in accordance with still another embodiment of the present invention.
The reference numerals are expressed as:
1. a first reverse osmosis membrane sheet; 11. a first membrane; 12. a second membrane; 2. a second reverse osmosis membrane; 21. a third membrane; 22. a fourth diaphragm; 3. a central tube; 31. a water passing hole; 41. a first pure water guiding cloth; 42. a second pure water guiding cloth; 51. a first water inlet grid; 52. a second water inlet grid; 100. a first pure water flow path; 101. a pure water outlet; 200. a raw water flow passage; 201. a raw water inlet; 202. a concentrated water outlet; 203. a first raw water flow passage; 204. a second raw water flow path; 205. a third raw water flow passage; 300. and (5) a glue layer.
Detailed Description
Referring to fig. 1 to 9 in combination, according to an embodiment of the present invention, there is provided a method for manufacturing a roll-type reverse osmosis membrane element, including the steps of:
a reverse osmosis membrane water purifying unit forming step, namely folding the front surface (namely, the surface contacted with raw water) of the first reverse osmosis membrane 1 in half, wherein the folded first reverse osmosis membrane 1 is divided into a first membrane 11 and a second membrane 12 by taking the folded edge as a boundary, and the rolling length of the first membrane 11 (namely, the length of the first membrane 11 in the rolling direction when the first membrane is in an unfolding state) is longer than the rolling length of the second membrane 12; the front side of the second reverse osmosis membrane 2 is folded in half, the folded second reverse osmosis membrane 2 is divided into a third membrane 21 and a fourth membrane 22 by taking the folded edge as a boundary, wherein the rolled length of the fourth membrane 22 is longer than that of the third membrane 21, and in colloquial terms, the first membrane 11 and the fourth membrane 22 can be called as long half pages, and the second membrane 12 and the third membrane 21 can be called as short half pages; placing the folded second reverse osmosis membrane 2 over the folded first reverse osmosis membrane 1, and making the opposite side (i.e. the side contacting with pure water) of the second membrane 12 opposite to the opposite side of the third membrane 21 (and capable of being aligned to improve the membrane utilization), meanwhile, applying glue between the opposite side of the second membrane 12 and the opposite side of the third membrane 21 to form a first pure water channel 100 with a pure water outlet 101 facing to the folded side, specifically referring to fig. 4, applying glue along a U-shaped track between the two to form a glue layer 300, wherein the U-shaped glue layer 300 defines a pure water channel 100 between the second membrane 12 and the third membrane 21, and the pure water outlet 101 of the pure water channel 100 is the opening position of the U-shaped glue layer 300; then, the back surface of the fourth membrane 22 is glued in the same manner as the aforementioned U-shaped glue layer 300 between the back surfaces of the second membrane 12 and the third membrane 21, so that a second pure water channel is formed between the back surface of the fourth membrane 22 and the back surface of the first membrane 11 after the reverse osmosis membrane water purifying unit is rolled, and the pure water outlet of the second pure water channel is the opening position of the second pure water channel, and the position corresponds to the aforementioned pure water outlet 101;
a rolling step of rolling the formed reverse osmosis membrane water purifying unit on the outer circumference side of the central tube 3, wherein the back surface of the fourth membrane 22 is glued, so that the back surface edge of the fourth membrane 22 forms bonding with the corresponding position of the back surface of the first membrane 11 in the rolling process, and a pure water flow passage communicated with the first pure water flow passage 100 is formed;
a raw water flow channel inlet forming step, wherein the raw water inlet 201 of the raw water flow channel 200 is formed by gluing and sealing the end part area corresponding to the second membrane 12 in the rolled reverse osmosis membrane water purifying unit, and meanwhile, it can be understood that a notch formed in the bus direction of the cylindrical reverse osmosis membrane water purifying unit after rolling, namely a concentrated water outlet 202 is formed, namely the concentrated water outlet 202 of the reverse osmosis membrane water purifying unit is laterally discharged. Specifically, when the rolling step is completed, the end area of the second membrane 12 corresponding to the third membrane 21 will be a circular ring area (as shown by 201 area in fig. 6), and the circular ring area naturally includes the portions of the first membrane 11 and the fourth membrane 22 opposite to the second membrane 12 and the third membrane 21, where the end area of the second membrane 12, that is, the end area of the third membrane 21, may be the radial inner position or the radial outer position of the cylinder formed after the rolling is completed, and it is further understood that the raw water inlet 201 may be only located at one end of the cylinder, and preferably both ends of the raw water inlet 201 are formed.
In this technical solution, the parts between the front surfaces of the first membrane 11 and the second membrane 12 and between the front surfaces of the third membrane 21 and the fourth membrane 22, which correspond to the raw water flow channel inlet 201, are water inlet areas of the raw water flow channel, while the areas between the front surfaces of the first membrane 11 and the fourth membrane 22, which are longer than the front surfaces of the second membrane 12 and the third membrane 21, correspond to water outlet areas of the raw water flow channel 200, and the lengths of the second membrane 12 and the third membrane 21 formed by flanging are smaller than those of the first membrane 11 and the fourth membrane 22, so that the first raw water flow channel and the second raw water flow channel are combined into a third raw water flow channel at the rear, the size of the raw water flow channel at the concentrate side is reduced, the membrane surface flow rate at the concentrate side is further improved, the concentration polarization at the concentrate side is slowed down, the possibility of fouling and blocking of the filter element at the concentrate side due to the low membrane surface flow rate is reduced, the anti-fouling performance of the reverse osmosis membrane is improved, and the service life of the reverse osmosis membrane filter element is prolonged.
In some embodiments, before the formed reverse osmosis membrane water purifying unit is rolled on the outer circumferential side of the central tube 3 in the rolling step, the method further comprises the steps of rolling the first pure water guiding cloth 41 on the outer circumferential wall of the central tube 3 for at least one circle and then unfolding, then stacking the formed reverse osmosis membrane water purifying unit on one side of the first pure water guiding cloth 41 facing the central tube 3, and attaching the reverse side of the first membrane 11 to the first pure water guiding cloth 41, wherein after the rolling is finished, the first pure water guiding cloth 41 is positioned on the outer side of the whole rolled reverse osmosis membrane element, can form a package for the element, and can guide pure water filtered out from the reverse side of the reverse osmosis membrane on the outermost layer to the pure water outlet 101, so that the utilization rate of the membrane is improved.
Referring to fig. 3, the second pure water guide cloth 42 is inserted into the first pure water flow path 100, and the second pure water guide cloth 42 can smoothly guide pure water in the pure water flow path 100 to the pure water outlet 101 at the end of the flow path, thereby improving the water purification efficiency.
Referring to fig. 2, a portion of the raw water flow path 200 formed between the front surface of the first membrane 11 and the front surface of the second membrane 12 is a first raw water flow path 203, and a first water inlet grid 51 is inserted into the first raw water flow path 203; and the portion of the raw water flow channel 200 formed between the front surface of the third membrane 21 and the front surface of the fourth membrane 22 is the second raw water flow channel 204, the second raw water flow channel 204 is internally inserted with the second water inlet grid 52, and the portion of the raw water flow channel 200 formed between the front surface portion of the first membrane 11, where the second membrane 12 is grown, and the front surface portion of the fourth membrane 22, where the third membrane 21 is grown, is the third raw water flow channel 205, it can be understood that the flow cross-sectional area of the third raw water flow channel 205 is smaller than the sum of the first raw water flow channel 203 and the second raw water flow channel 204, that is, the flow cross-sectional area of raw water inlet is narrowed down at the downstream in terms of the path of raw water inlet, so that throttling and speed-up can be formed on the concentrate side of raw water, concentration polarization on the concentrate side is slowed down, and the anti-pollution performance of the reverse osmosis membrane is improved. The first water inlet mesh 51 and the second water inlet mesh 52 are provided to ensure smooth flow of raw water. In a preferred embodiment, the rolled length of the first water inlet mesh 51 is not shorter than the rolled length of the first membrane 11, and in order to ensure that the water flow is smooth, the length of the first water inlet mesh 51 is generally 1-10mm longer than the length of the first membrane 11; and/or, the rolled length of the second water inlet grid 52 is longer than the rolled length of the third membrane 21, specifically in one embodiment, the rolled length of the second water inlet grid 52 is 5-10mm longer than the rolled length of the third membrane 21, so that the raw water flow channel is ensured to be smooth, and the phenomenon that the fluid circulation is not smooth due to direct contact between the front surfaces of the reverse osmosis membrane sheets is avoided.
The rolling length of the second pure water diversion cloth 42 is longer than that of the second membrane 12, specifically, the rolling length of the second pure water diversion cloth 42 is 1-10mm longer than that of the second membrane 12, the pure water flow passage is ensured to be smooth, the gap between the reverse sides of the reverse osmosis membrane is prevented from being too small, and the produced water is prevented from flowing smoothly.
In some embodiments, the rolling length of the first membrane 11 is equal to the rolling length of the fourth membrane 22, and is L1, the rolling length of the second membrane 12 is equal to the rolling length of the third membrane 21, and is L2,1/3 is less than or equal to L2/L1 is less than or equal to 3/4, so as to further improve the effect of slowing down concentration polarization on the concentrate side and improving the anti-pollution performance of the reverse osmosis membrane.
The rolling length of the raw water inlet 201 is L0, and L0/L2 is more than or equal to 1/10 and less than or equal to 1/2, so that the problems of overlarge resistance and unsmooth water inlet caused by overlarge length of the raw water inlet 201 and the change of the flow channel direction caused by overlarge length can be prevented, and the design performance is influenced.
As shown in fig. 4, the wall of the central tube 3 is provided with a plurality of water holes 31, the water holes 31 may be arranged at intervals along the axial direction of the central tube 3, the specific assembly of the reverse osmosis membrane water purifying unit may be flexibly selected, specifically, in the rolling step, as shown in fig. 2 to 7, the pure water outlet 101 of the reverse osmosis membrane water purifying unit faces to one side of the central tube 3, at this time, the pure water outlet 101 is communicated with the water holes 31, at least one end of the central tube 3 may be used as a final outlet of pure water, the raw water in the raw water channel 200 enters the pure water channel (including the first pure water channel 101) and flows out from the orifice of the central tube 3 through the water holes 31 after being filtered and purified for the first reverse osmosis membrane 1 and the second reverse osmosis membrane 2, and correspondingly, the raw water finally forms concentrated water at this time flows out through the concentrated water outlet 202 located at the side of the element; as another possible way, referring to fig. 8 and 9, the concentrated water outlet 202 of the raw water channel 200 of the reverse osmosis membrane water purifying unit faces to the side of the central tube 3, that is, the concentrated water flows out from the orifice of the central tube 3 through the overflow hole 31, and the corresponding pure water outlet 101 is located at the side of the element and flows out.
Referring to fig. 7 and 9, the reverse osmosis membrane water purifying unit has a plurality of layers (two layers are shown), and the pure water outlets 101 of the reverse osmosis membrane water purifying units of the respective layers correspond to each other, so that the water purifying capacity of the roll type reverse osmosis membrane element can be improved.
According to the embodiment of the invention, a rolled reverse osmosis membrane element is also provided, and the rolled reverse osmosis membrane element is manufactured by the manufacturing method.
According to the embodiment of the invention, a water purifier is further provided, which comprises the coiled reverse osmosis membrane element.
Those skilled in the art will readily appreciate that the advantageous features of the various aspects described above may be freely combined and stacked without conflict.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention. The foregoing is merely a preferred embodiment of the present invention, and it should be noted that it will be apparent to those skilled in the art that modifications and variations can be made without departing from the technical principles of the present invention, and these modifications and variations should also be regarded as the scope of the invention.
Claims (11)
1. The manufacturing method of the coiled reverse osmosis membrane element is characterized by comprising the following steps of:
the method comprises the steps of forming a reverse osmosis membrane water purifying unit, namely folding the front surface of a first reverse osmosis membrane (1), wherein the folded first reverse osmosis membrane (1) is divided into a first membrane (11) and a second membrane (12) by taking a folded edge as a boundary, and the rolling length of the first membrane (11) is longer than that of the second membrane (12); folding the front surface of a second reverse osmosis membrane (2), wherein the folded second reverse osmosis membrane (2) is divided into a third membrane (21) and a fourth membrane (22) by taking the folded edge as a boundary, and the rolled length of the fourth membrane (22) is larger than that of the third membrane (21); placing the folded second reverse osmosis membrane (2) on the folded first reverse osmosis membrane (1), enabling the back surface of the second membrane (12) to be opposite to the back surface of the third membrane (21), and applying glue between the back surface of the second membrane (12) and the back surface of the third membrane (21) to form a first pure water flow channel (100) with a pure water outlet (101) facing the folded side; -applying glue to the reverse side of said fourth membrane (22);
a rolling step of rolling the formed reverse osmosis membrane water purification unit on the outer circumference side of the central tube (3);
and a raw water runner inlet forming step, wherein a raw water inlet (201) of the raw water runner (200) is formed by gluing and sealing the end part area corresponding to the second membrane (12) in the rolled reverse osmosis membrane water purifying unit.
2. The method according to claim 1, wherein, in the rolling step,
before the formed reverse osmosis membrane water purification unit is rolled on the outer circumferential side of the central tube (3), the reverse osmosis membrane water purification unit further comprises a first pure water diversion cloth (41) which is rolled on the outer circumferential wall of the central tube (3) for at least one circle and then is unfolded, the formed reverse osmosis membrane water purification unit is laminated on one side of the first pure water diversion cloth (41) which faces the central tube (3), and the back surface of the first membrane (11) is attached to the first pure water diversion cloth (41).
3. The method according to claim 1, wherein,
a second pure water guide cloth (42) is inserted in the first pure water flow passage (100); and/or, a raw water flow passage (200) formed between the front surface of the first membrane (11) and the front surface of the second membrane (12) is a first raw water flow passage (203), and a first water inlet grid (51) is inserted into the first raw water flow passage (203); and/or, the part of the raw water flow channel (200) formed between the front surface of the third membrane (21) and the front surface of the fourth membrane (22) is a second raw water flow channel (204), and a second water inlet grid (52) is inserted into the second raw water flow channel (204).
4. The method of claim 3, wherein,
the rolled length of the first water inlet grid (51) is not shorter than the rolled length of the first membrane (11); and/or the rolled length of the second water inlet grid (52) is longer than the rolled length of the third membrane (21).
5. The method of claim 3, wherein,
the rolled length of the second pure water diversion cloth (42) is longer than that of the second membrane (12).
6. The method according to claim 1, wherein,
the rolling length of the first membrane (11) is equal to that of the fourth membrane (22) and is L1, and the rolling length of the second membrane (12) is equal to that of the third membrane (21) and is L2, and L2/3 is less than or equal to L2/L1 is less than or equal to 3/4.
7. The method of claim 6, wherein,
the coiling length of the raw water inlet (201) is L0, and L0/L2 is more than or equal to 1/10 and less than or equal to 1/2.
8. The method according to claim 1, wherein,
the pipe wall of the central pipe (3) is provided with a water passing hole (31), and in the rolling step,
the pure water outlet (101) of the reverse osmosis membrane water purification unit faces one side of the central pipe (3); alternatively, the concentrated water outlet (202) of the raw water flow channel (200) of the reverse osmosis membrane water purification unit faces to the side of the central tube (3).
9. The method according to claim 1, wherein,
the reverse osmosis membrane water purification unit is provided with a plurality of layers which are laminated, and the pure water outlets (101) respectively arranged in each layer of the reverse osmosis membrane water purification unit are respectively corresponding to each other.
10. A roll-type reverse osmosis membrane element, characterized in that the roll-type reverse osmosis membrane element is manufactured by the manufacturing method of any one of claims 1 to 9.
11. A water purifier comprising the roll-type reverse osmosis membrane element according to claim 10.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115782140A (en) * | 2022-11-28 | 2023-03-14 | 珠海格力电器股份有限公司 | Reverse osmosis membrane assembly manufacturing method, reverse osmosis membrane assembly and water purifier |
| WO2024113896A1 (en) * | 2022-11-28 | 2024-06-06 | 珠海格力电器股份有限公司 | Rolled reverse osmosis membrane element and water purifier comprising same |
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| Publication number | Priority date | Publication date | Assignee | Title |
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