CN110508138B - Method for manufacturing roll type reverse osmosis membrane element - Google Patents
Method for manufacturing roll type reverse osmosis membrane element Download PDFInfo
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- CN110508138B CN110508138B CN201910894360.3A CN201910894360A CN110508138B CN 110508138 B CN110508138 B CN 110508138B CN 201910894360 A CN201910894360 A CN 201910894360A CN 110508138 B CN110508138 B CN 110508138B
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- pure water
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- 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
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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
- B01D63/061—Manufacturing thereof
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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
Abstract
The invention relates to a manufacturing method of a roll type reverse osmosis membrane element, which comprises the following steps: the front face of the reverse osmosis membrane is folded in half, and the water inlet separation net is inserted between the opposite front faces; laminating the pure water guide cloth under the first membrane, and gluing between the pure water guide cloth and the reverse side of the first membrane to form a pure water flow channel with a pure water outlet positioned at the folded edge of the reverse osmosis membrane between the first membrane and the pure water guide cloth; connecting the short edge of the pure water guide cloth far away from the pure water outlet with a concentrated water pipe, and then rolling the adhered reverse osmosis membrane, the water inlet separation net and the pure water guide cloth on the concentrated water pipe; and gluing the end surfaces of the rolled reverse osmosis membrane and the water inlet separation net to seal the raw water flow passage part, wherein the gluing position is a part close to the concentrated water pipe. When water is produced, raw water flows along the long edge of the raw water channel, and is subjected to osmotic filtration, so that the water production efficiency is high. The flow speed of the concentrated water in the raw water flow channel is higher at the position close to the concentrated water pipe, and the concentration polarization phenomenon at the concentrated water side is effectively relieved.
Description
Technical Field
The invention relates to the field of water purification, in particular to a manufacturing method of a roll type reverse osmosis membrane element.
Background
The roll-type reverse osmosis membrane element mainly comprises a reverse osmosis membrane, a water inlet separation net, pure water diversion cloth and a central water production pipe. The water purifying element is formed by rolling the water inlet separation net, the reverse osmosis membrane and the pure water diversion cloth on the central water producing pipe. In the using process, water molecules in raw water permeate the reverse osmosis membrane by utilizing the permeation function of the reverse osmosis membrane and pressurizing the raw water side, and the water molecules are converged at the pure water side to form pure water. With the forward movement of the water flow in the raw water flow channel, the raw water gradually forms concentrated water on the concentrated water side, finally the concentrated water flows out from the concentrated water outlet, and the pure water flows out from the pure water outlet. The concentration of the concentrated water close to the concentrated water side in the raw water flow passage is increased along the advancing direction of the raw water flow passage. The concentration polarization phenomenon of the common reverse osmosis membrane element on the concentrated water side is obvious, and the service life of the element is short.
Disclosure of Invention
Therefore, there is a need for a method for manufacturing a rolled reverse osmosis membrane element to improve the concentration polarization phenomenon on the concentrated water side in the raw water channel and prolong the service life.
A manufacturing method of a roll type reverse osmosis membrane element comprises the following steps:
the front face of the reverse osmosis membrane is folded, the water inlet separation net is inserted between the opposite front faces, and the reverse osmosis membrane is divided into a first membrane and a second membrane by taking the folded edge as a boundary after being folded;
laminating a pure water guide cloth under the first membrane, and gluing between the pure water guide cloth and the reverse side of the first membrane to form a pure water flow channel with a pure water outlet positioned at the folded edge of the reverse osmosis membrane between the first membrane and the pure water guide cloth;
connecting a short edge of the pure water guide cloth, which is far away from a pure water outlet, with a concentrated water pipe, and then rolling the bonded reverse osmosis membrane, the water inlet separation net and the pure water guide cloth on the concentrated water pipe;
and gluing the end surfaces of the rolled reverse osmosis membrane and the water inlet separation net to seal the raw water flow passage part, wherein the gluing position is a part close to the concentrated water pipe, so that a raw water inlet is formed at a position close to the outer side surface on the end surface.
The scheme provides a method for manufacturing a roll type reverse osmosis membrane element, and a water inlet separation net is clamped between the opposite front surfaces of the reverse osmosis membranes to form a raw water flow channel. And after the pure water flow guide cloth and the reverse side of the first membrane are glued to form the pure water flow channel, connecting a short side, far away from the pure water outlet, of the pure water flow guide cloth with the concentrated water pipe, so that the pure water outlet is positioned on the outer side surface after being rolled. After rolling is finished, glue is applied to the end face of the reverse osmosis membrane and the water inlet separation net, and the raw water flow passage is partially sealed, so that the raw water inlet is positioned on the long edge of the raw water flow passage and is close to the outer side face. Thereby make among the filtering process, the raw water walks long limit, has improved system water effect, and the velocity of flow of position dense water and pure water near the dense water pipe is all higher, has both alleviated the dense water side concentration polarization phenomenon, has also solved the big problem of pure water side backpressure near dense water pipe department. Thereby prolonging the service life of the roll type reverse osmosis membrane element manufactured by the method.
In one embodiment, the method for manufacturing the rolled reverse osmosis membrane element further comprises the following steps: when the reverse osmosis membrane, the water inlet separation net and the pure water diversion cloth are rolled on the concentrated water pipe, the innermost second membrane is connected with the outermost first membrane to form a pure water flow passage with a pure water outlet positioned on the outer side surface, and the outermost pure water diversion cloth is positioned in the pure water flow passage.
In one embodiment, the position for gluing at the short side of the first membrane sheet is a short side pasting position, and the distance between the short side pasting position and the side edge of the first membrane sheet opposite to the thick water pipe is 1 cm-3 cm.
In one embodiment, the position for applying glue on the long side of the first membrane is a long side pasting position, and the distance between the long side pasting position and the long side edge of the first membrane is 1 cm-3 cm.
In one embodiment, the glue lines arranged along the long sides on the pure water guide cloth are long-side glue lines, one end, far away from the concentrated water pipe, of each long-side glue line extends out of the pure water guide cloth, and the length of the long-side glue lines extending out of the pure water guide cloth is not less than the perimeter of the outer side face formed by the rolled pure water guide cloth.
In one embodiment, the outermost pure water guide cloth is an outer layer guide cloth, the long-side glue line on the outer layer guide cloth is a first long-side glue line, one end of the first long-side glue line, which is far away from the thick water pipe, extends out of the outer layer guide cloth, and the length of the first long-side glue line extending out of the outer layer guide cloth is not less than the perimeter of the outer side surface formed by the rolled pure water guide cloth.
In one embodiment, the reverse osmosis membrane, the water inlet separation net and the pure water diversion cloth form a plurality of reverse osmosis membrane groups, the reverse osmosis membrane groups are laminated and adhered, an inner layer membrane group is positioned on the inner layer in the adjacent reverse osmosis membrane groups, and an outer layer membrane group is positioned on the outer layer.
In one embodiment, the specific steps of laminating and pasting the adjacent reverse osmosis membrane groups are as follows:
and adhering the side surface of the pure water guide cloth of the inner membrane group, which is opposite to the first membrane, to the reverse surface of the second membrane of the outer membrane group to form a pure water flow channel with a pure water outlet positioned on the outer side surface.
In one embodiment, when the inner membrane plate group is laminated and adhered to the outer membrane plate group, the inner membrane plate group can be arranged in a staggered mode relative to the outer membrane plate group along the direction far away from the concentrated water pipe.
In one embodiment, the inner membrane sheet group is staggered from the outer membrane sheet group in a direction away from the concentrated water pipe by a distance L, the outer circumference of the concentrated water pipe is D, and the number of the reverse osmosis membrane sheet groups is n, so that L is D/n.
Drawings
FIG. 1 is a flow chart of a method for manufacturing a rolled reverse osmosis membrane element according to the present embodiment;
FIG. 2 is a schematic view showing a partially developed rolled reverse osmosis membrane element according to the present embodiment;
FIG. 3 is an enlarged view of a portion of FIG. 2 at A;
FIG. 4 is a schematic structural diagram of the water flow direction of the roll type reverse osmosis membrane element according to the present embodiment;
FIG. 5 is a diagram of a fully expanded flow state of a reverse osmosis membrane stack in the spiral wound reverse osmosis membrane element of FIG. 4;
FIG. 6 is an isometric view of the rolled reverse osmosis membrane element shown in FIG. 2 when fully deployed;
FIG. 7 is a front view of the roll-type reverse osmosis membrane element shown in FIG. 6;
FIG. 8 is a top view of the rolled reverse osmosis membrane element shown in FIG. 6;
FIG. 9 is an end view of a reverse osmosis membrane stack in a reverse osmosis membrane element according to this embodiment;
fig. 10 is a schematic structural view of a reverse osmosis membrane sheet of the rolled reverse osmosis membrane element of the present embodiment rolled on a concentrate pipe.
Description of reference numerals:
10. a roll-type reverse osmosis membrane element; 11. a concentrated water pipe; 111. water passing holes; 12. a reverse osmosis membrane set; 121. pure water diversion cloth; 122. a reverse osmosis membrane; 1221. folding edges; 1222. a long side; 1223. a first diaphragm; 1224. a second diaphragm; 123. a water inlet separation net; 124. a raw water flow passage; 1241. a raw water inlet; 125. an outer side surface; 126. a pure water flow passage; 1261. a pure water outlet; 127. a sealing part; 128. an outer edge portion; 13. short edge glue lines; 14. and (5) long-edge glue lines.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather should be construed as broadly as the present invention is capable of modification in various respects, all without departing from the spirit and scope of the present invention.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
In one embodiment, as shown in fig. 1, there is provided a method for manufacturing a roll-type reverse osmosis membrane element, comprising the steps of:
the front face of the reverse osmosis membrane 122 is folded in half, the water inlet separation net 123 is inserted between the opposite front faces, and after folding in half, the reverse osmosis membrane 122 is divided into a first membrane 1223 and a second membrane 1224 by taking the folded edge 1221 as a boundary;
laminating a pure water guide cloth 121 under the first membrane 1223, and applying glue between the pure water guide cloth 121 and the reverse side of the first membrane 1223, so that a pure water flow passage 126 having a pure water outlet 1261 at a folded edge 1221 of the reverse osmosis membrane 122 is formed between the first membrane 1223 and the pure water guide cloth 121;
connecting the short side of the pure water guide cloth 121 far away from the pure water outlet 1261 with the concentrated water pipe 11, and then rolling the adhered reverse osmosis membrane 122, the water inlet separation net 123 and the pure water guide cloth 121 on the concentrated water pipe 11, so that the outlet of the rolled raw water flow passage 124 faces the concentrated water pipe 11, and the pure water outlet 1261 of the pure water flow passage 126 is positioned on the outer side surface 125;
the raw water flow passage 124 is partially sealed by applying glue to the end surface of the rolled reverse osmosis membrane 122 and the water inlet screen 123, and the glue application position is a portion close to the concentrated water pipe 11, so that a raw water inlet 1241 is formed on the end surface close to the outer side surface 125.
Therefore, in the filtering process, the advancing path of the raw water is the long edge 1222, the water production effect is improved, the flow rates of the concentrated water and the pure water at the position close to the concentrated water pipe 11 are high, the concentration polarization phenomenon of the concentrated water side is relieved, and the problem of high back pressure of the pure water side close to the concentrated water pipe 11 is solved. Thereby prolonging the service life of the roll type reverse osmosis membrane element 10 manufactured by the method.
Further, in one embodiment, the method for manufacturing the rolled reverse osmosis membrane element further comprises the following steps: when the reverse osmosis membrane 122, the water inlet separation net 123 and the pure water guide cloth 121 are rolled on the concentrated water pipe 11, the innermost second membrane 1224 is connected to the outermost first membrane 1223 to form a pure water flow passage 126 with a pure water outlet located at the outer side surface, and the outermost pure water guide cloth 121 is located in the pure water flow passage 126.
Therefore, pure water can be formed in the pure water flow passage 126 formed by the innermost second membrane 1224 and the outermost first membrane 1223 in the water production process, and the utilization rate of the whole membrane is improved.
If there is only one reverse osmosis membrane group 12, the above innermost second membrane 1224 and the outermost first membrane 1223 are formed by folding the same reverse osmosis membrane 122. If there are two or more reverse osmosis membrane modules 12, as shown in fig. 7, the second membrane 1224 located at the innermost layer is the second membrane 1224 located at the uppermost layer after stacking, and the first membrane 1223 located at the outermost layer is the first membrane 1223 located at the lowermost layer after stacking.
Specifically, in one embodiment, as shown in fig. 6 and 8, the position for applying glue at the short side of the first membrane 1223 is a short side pasting position, and the distance between the short side pasting position and the side of the first membrane 1223 opposite to the concentrated water pipe 11 is 1cm to 3 cm. The reliability of connection is ensured, and meanwhile, the condition that glue overflows when being rolled is relieved. The reverse osmosis membrane 122 above the uppermost pure water guide cloth 121 in fig. 6 and 8 is not shown, and the glue line 13 on the short side of the pure water guide cloth 121 in fig. 6 and 8 is a glue line formed by applying glue on the gluing position of the short side of the first membrane 1223 in the reverse osmosis membrane 122, which is not shown.
Similarly, in one embodiment, as shown in fig. 8, the position for applying glue on the long side 1222 of the first film sheet 1223 is a long-side pasting position, and the distance between the long-side pasting position and the side edge of the long side 1222 of the first film sheet 1223 is 1cm to 3 cm.
And the two ends of the short side pasting position are connected with the two long side pasting positions, so that a complete glue line as shown in fig. 6 and 8 is formed on the corresponding pure water guide cloth 121, and the sealing reliability is improved.
Further, in an embodiment, the glue line on the pure water guide cloth 121 along the long side 1222 is a long side glue line 14, as shown in fig. 8, one end of the long side glue line 14 away from the concentrated water pipe 11 extends out of the pure water guide cloth 121, and the length of the long side glue line 14 extending out of the pure water guide cloth 121 is not less than the circumference of the outer side 125 formed by the rolled pure water guide cloth 121. Therefore, the rolled long-side glue line 14 can rotate at least one circle along the outer side surface 125, and the sealing reliability is further improved.
Of course, the long-side glue lines 14 corresponding to each pure water guide cloth 121 may extend out of the corresponding pure water guide cloth 121, or only the long-side glue lines 14 corresponding to the outermost pure water guide cloth 121 may extend out of the corresponding pure water guide cloth 121.
For example, in one embodiment, the outermost pure water guide cloth 121 is an outer layer guide cloth, the long-side glue line 14 on the outer layer guide cloth is a first long-side glue line, one end of the first long-side glue line, which is far away from the thick water pipe 11, extends out of the outer layer guide cloth, and the length of the first long-side glue line, which extends out of the outer layer guide cloth, is not less than the circumference of the outer side 125 formed by the pure water guide cloth 121 after being rolled.
Namely, the long-side glue line 14 corresponding to the pure water guide cloth 121 on the outermost layer is arranged to extend out of the outer layer, so that after the reverse osmosis membrane 122, the water inlet separation net 123 and the pure water guide cloth 121 are rolled on the concentrated water pipe 11, the first long-side glue line can be continuously wound for at least one circle, and the sealing performance of the pure water flow channel 126 is improved.
Further, in an embodiment, the reverse osmosis membrane 122, the water inlet separation net 123 and the pure water guide cloth 121 form a plurality of reverse osmosis membrane groups 12, the reverse osmosis membrane groups 12 are laminated and adhered to one another, an inner membrane group is located at an inner layer in adjacent reverse osmosis membrane groups 2, and an outer membrane group is located at an outer layer.
That is, after the plurality of reverse osmosis membrane groups 12 are laminated, the plurality of reverse osmosis membrane groups 12 are rolled on the concentrate pipe 11 as shown in fig. 10.
Further, when the inner membrane sheet group is laminated on the outer membrane sheet group, the inner membrane sheet group is disposed in a shifted manner with respect to the reverse osmosis membrane sheet group 12 in a direction away from the concentrated water pipe 11. So that the overall radial thickness of the reverse osmosis membrane group 12 on the concentrated water pipe 11 is gradually increased during rolling.
Specifically, the inner membrane group is staggered with respect to the outer membrane group by a distance L in a direction away from the concentrated water pipe, and the following relationship is satisfied:
if the outer circumference of the concentrate pipe 11 is D and the number of the reverse osmosis membrane groups 12 is n, L is D/n.
Therefore, after each reverse osmosis membrane group 12 is rolled on the concentrated water pipe 11, the openings of the raw water channel 124 corresponding to each reverse osmosis membrane group 12, which are opposite to the concentrated water pipe 11, are uniformly distributed on the outer surface of the concentrated water pipe 11, so that the outflow speed of the concentrated water in each raw water channel 124 is increased, and the water production efficiency is improved.
Specifically, in one embodiment, the steps of laminating and adhering the adjacent reverse osmosis membrane groups 12 are as follows:
the side of the pure water guiding cloth 121 of the inner membrane set opposite to the first membrane 1223 is adhered to the reverse side of the second membrane 1224 of the outer membrane set to form a pure water channel 126 with a pure water outlet 1261 on the outer side 125.
The glue applying position during the specific pasting can adopt the setting mode of the short edge pasting position and the long edge pasting position. Specifically, the distance between the short edge pasting position and the corresponding side edge of the first membrane 1223 opposite to the concentrated water pipe 11 is 1 cm-3 cm. The distance between the long-edge pasting position and the corresponding long edge 1222 side of the first membrane 1223 is 1 cm-3 cm.
Further, in one embodiment, the roll-type reverse osmosis membrane element 10 shown in fig. 2 is manufactured according to the manufacturing method of the roll-type reverse osmosis membrane element in any one of the above embodiments. The rolled reverse osmosis membrane element 10 comprises a concentrated water pipe 11, and a pure water guide cloth 121, a reverse osmosis membrane 122 and a water inlet separation net 123 which are all rolled on the concentrated water pipe 11.
As shown in fig. 3, the raw water flow passage 124 is formed by folding the reverse osmosis membrane 122 in half on the front, and the water inlet screen 123 is inserted into the raw water flow passage 124. As shown in fig. 6 and 7, the opening formed by folding the reverse osmosis membrane 122 is toward the concentrated water pipe 11, and the opening is communicated with the concentrated water pipe 11, so that the folded edge 1221 formed by folding is away from the concentrated water pipe 11.
As shown in fig. 5, when the raw water flow passage 124 is partially sealed by applying glue to the end surfaces of the rolled reverse osmosis membrane 122 and the water inlet screen 123 at a position close to the concentrated water pipe 11, the long side 1222 of the raw water flow passage 124 is partially sealed, and the raw water inlet 1241 is formed at one end close to the folded side 1221. As shown in fig. 5, in the filtering process, the raw water traveling path is the long side 1222 of the reverse osmosis membrane 122, the length of the raw water flow passage 124 is increased, and the water production efficiency is high. In addition, the position close to the concentrated water pipe 11, the flow speed of the concentrated water in the raw water channel 124 is high, so that the concentration polarization phenomenon on the concentrated water side can be effectively relieved, and the service life is prolonged.
The front surface of the reverse osmosis membrane 122 herein refers to a surface through which water molecules permeate in a high pressure environment, that is, a surface of the reverse osmosis membrane 122 on which the raw water flow passage 124 is formed. Correspondingly, the other side of the reverse osmosis membrane 122 is the opposite side.
The outer side 125 of the reverse osmosis membrane element 10 herein refers to an outer side formed by the pure water guide cloth 121, the reverse osmosis membrane 122 and the water inlet separation net 123 after the pure water guide cloth 121, the reverse osmosis membrane 122 and the water inlet separation net 123 are rolled on the concentrated water pipe 11.
The short side is a side distributed along the axial direction of the concentrate pipe 11, and the long side 1222 is a side spirally wound on the concentrate pipe 11 along the circumferential direction, that is, the long side 1222 is a side distributed along the advancing direction of the water flow during water production. Generally, after the reverse osmosis membrane 122, the pure water guide cloth 121 and the water inlet screen 123 are wound on the concentrate pipe 11 for a plurality of turns, the long side 1222 is larger than the short side, so that the efficiency of filtering the raw water before the long side 1222 is high.
Specifically, the long side 1222 of the raw water flow passage 124 is partially sealed by coating and sealing the end surface with glue after the water inlet screen 123, the reverse osmosis membrane 122 and the pure water guide cloth 121 are rolled on the concentrated water pipe 11, or by combining glue and a sealing end cap.
For example, a seal end cap is provided on the end face, and a raw water port is provided on the seal end cap at a position corresponding to the raw water inlet 1241 for water to pass through. The above partial sealing is achieved by applying glue between the end closure and the above-mentioned end face.
As shown in fig. 9, assuming that the radial thickness of the end surface of the reverse osmosis membrane stack 12 including the pure water guide cloth 121, the reverse osmosis membrane 122 and the water inlet mesh 123 is R, the position on the end surface where sealing is required is a sealing portion 127, and the position where the raw water inlet 1241 is formed is an outer edge portion 128, the outer edge portion 128 is surrounded outside the sealing portion 127, and if the radial thickness of the sealing portion 127 is R, R/R is 2/3 ≦ R < 1.
As shown in fig. 5, the length of the long side 1222 of the raw water channel 124 in the circumferential direction is L, the length of the raw water inlet 1241 in the circumferential direction is h, and h/L is greater than or equal to 1/15 and less than or equal to 1/2. Therefore, the size of the raw water inlet 1241 is limited, if the length of the raw water inlet 1241 is too large, the length of the raw water flow channel 124 is reduced, and the reliability of the connection between the pure water guide cloth 121 corresponding to the raw water inlet 1241 and the reverse osmosis membrane 122 due to the high-pressure environment of the raw water inlet 1241 threatens, so that the size of the raw water inlet 1241 needs to be reasonably arranged, the requirement of water production efficiency is met, and the reliability of the filter element is also guaranteed.
As shown in fig. 6 and 7, the pure water flow path 126 formed by applying glue between the pure water guiding cloth 121 and the first membrane 1223 is specifically a pure water flow path 126 formed by connecting two long sides 1222 of the first membrane 1223 and a short side close to the concentrated water pipe 11 to the pure water guiding cloth 121 and having a pure water outlet 1261 located on the outer side 125 of the reverse osmosis membrane element as shown in fig. 4.
As shown in fig. 4, pure water formed near the raw water inlet 1241 can flow out of the pure water passage 126 from the pure water outlet 1261 relatively quickly, and the flow rate of pure water in the pure water passage 126 near the concentrated water pipe 11 is relatively high, which effectively alleviates the problem of large back pressure on the pure water side near the concentrated water pipe 11.
Further, in one embodiment, as shown in fig. 6 and 7, the end of the water inlet screen 123 far from the folded edge 1221 extends beyond the second membrane 1224, and the distance that the water inlet screen 123 extends beyond the second membrane 1224 is not less than 0.5 cm.
The part of the water inlet screen 123 beyond the second diaphragm 1224 contacts the concentrated water pipe 11, so that the concentrated water in the raw water channel 124 is better guided into the concentrated water pipe 11, and the situation of scaling caused by poor flow of the concentrated water at a position close to the concentrated water pipe 11 is avoided.
Further, in one embodiment, the distance that the water inlet screen 123 extends beyond the second diaphragm 1224 is between 0.5cm and 3 cm. Therefore, the smooth flowing of the concentrated water at the concentrated water side is ensured, and the situation that the length of the raw water channel 124 is reduced under the condition that the length of the reverse osmosis membrane 122 is fixed is avoided, or the situation that the volume of the whole roll type reverse osmosis membrane element 10 is overlarge to ensure that the length of the raw water channel 124 reaches a certain value is avoided.
Further, in one embodiment, an end of the pure water guiding cloth 121 far from the concentrated water pipe 11 extends beyond the first membrane 1223, and a distance of the pure water guiding cloth 121 extending beyond the first membrane 1223 is not less than 0.5 cm. Guarantee that pure water outlet 1261 is in open state all the time, improve system water efficiency.
Similarly, in one embodiment, the distance between the pure water guiding cloth 121 and the first membrane 1223 is 0.5cm to 3 cm. Not only is the pure water outlet 1261 always in an open state ensured, but also the situation that the volume of the roll type reverse osmosis membrane element 10 is overlarge is avoided.
Further, as shown in fig. 2 and 3, in one embodiment, after two or more reverse osmosis membrane groups 12 are laminated and adhered, two or more reverse osmosis membrane groups 12 in the rolled reverse osmosis membrane element 10 obtained by the rolled reverse osmosis membrane element manufacturing method are laminated and arranged between the reverse osmosis membrane groups 12, and the short side and the long side 1222 of the second membrane 1224 of the reverse osmosis membrane group 12 are connected to the pure water guiding cloth 121 of the adjacent reverse osmosis membrane group 12, so as to form a pure water flow channel 126 with a pure water outlet 1261 located on the outer side 125 of the reverse osmosis membrane element.
Finally, a plurality of reverse osmosis membrane groups 12 are wound around the concentrated water pipe 11, and as shown in fig. 2, 3 and 10, a plurality of spiral raw water flow passages 124 and pure water flow passages 126 are wound around the concentrated water pipe 11.
Further, in one embodiment, as shown in fig. 6 and 7, an outer membrane group is located between adjacent reverse osmosis membrane groups 12, an inner membrane group is located between adjacent reverse osmosis membrane groups, and the inner membrane group is offset with respect to the outer membrane group in a direction away from the concentrated water pipe 11. The outer layer and the inner layer are referred to as an inner-outer coating relation during rolling.
Therefore, the raw water channels 124 in the reverse osmosis membrane groups 12 can be reliably communicated with the concentrated water pipe 11. Particularly, as shown in fig. 5 and 6, when the water through hole 111 is formed in the concentrated water pipe 11, the raw water flow passage 124 communicates with the concentrated water pipe 11 through the water through hole 111. The raw water channels 124 in each reverse osmosis membrane group 12 can be respectively communicated with the corresponding water through holes 111 by the staggered arrangement. The situation that the outlets of the raw water channels 124 communicated with the concentrated water pipe 11 are gathered at one position and the concentrated water cannot be discharged is avoided. And the dislocation arrangement also ensures that the whole radial thickness of the reverse osmosis membrane group 12 is gradually changed when the reverse osmosis membrane group is rolled on the concentrated water pipe 11.
Further, in another embodiment, a water purification system is provided, comprising the rolled reverse osmosis membrane element 10 according to any of the above embodiments. The concentration polarization phenomenon at the concentrated water side is effectively relieved while the water production efficiency is improved, so that the service life is prolonged.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A manufacturing method of a roll type reverse osmosis membrane element is characterized by comprising the following steps:
the front face of the reverse osmosis membrane is folded, the water inlet separation net is inserted between the opposite front faces, and the reverse osmosis membrane is divided into a first membrane and a second membrane by taking the folded edge as a boundary after being folded;
laminating a pure water guide cloth under the first membrane, and gluing between the pure water guide cloth and the reverse side of the first membrane to form a pure water flow channel with a pure water outlet positioned at the folded edge of the reverse osmosis membrane between the first membrane and the pure water guide cloth;
connecting a short edge of the pure water diversion cloth, which is far away from a pure water outlet, with a concentrated water pipe, and then rolling the bonded reverse osmosis membrane, the water inlet separation net and the pure water diversion cloth on the concentrated water pipe, so that the outlet of the rolled raw water runner faces the concentrated water pipe, and the pure water outlet of the pure water runner is positioned on the outer side surface;
gluing the end surfaces of the rolled reverse osmosis membrane and the water inlet separation net to seal the raw water flow passage part, wherein the gluing position is a part close to the concentrated water pipe, so that a raw water inlet is formed at a position close to the outer side surface on the end surface;
the length of the long edge of the raw water channel in the circumferential direction is L, the length of the raw water inlet in the circumferential direction is h, and h/L is not less than 1/15 and not more than 1/2.
2. The rolled reverse osmosis membrane element manufacturing method according to claim 1, further comprising the steps of: when the reverse osmosis membrane, the water inlet separation net and the pure water diversion cloth are rolled on the concentrated water pipe, the innermost second membrane is connected with the outermost first membrane to form a pure water flow passage with a pure water outlet positioned on the outer side surface, and the outermost pure water diversion cloth is positioned in the pure water flow passage.
3. The method for manufacturing the roll type reverse osmosis membrane element according to claim 1, wherein the position for applying glue at the short edge of the first membrane sheet is a short edge pasting position, and the distance between the short edge pasting position and the side edge of the first membrane sheet opposite to the concentrated water pipe is 1 cm-3 cm.
4. The method for manufacturing the roll type reverse osmosis membrane element according to claim 1, wherein the position for applying glue on the long side of the first membrane sheet is a long side pasting position, and the distance between the long side pasting position and the long side edge of the first membrane sheet is 1 cm-3 cm.
5. The method for manufacturing a roll type reverse osmosis membrane element according to claim 1, wherein the glue lines arranged along the long sides on the pure water flow cloth are long-side glue lines, one end of each long-side glue line, which is far away from the concentrated water pipe, extends out of the pure water flow cloth, and the length of each long-side glue line extending out of the pure water flow cloth is not less than the perimeter of the outer side surface formed by the rolled pure water flow cloth.
6. The manufacturing method of the roll type reverse osmosis membrane element according to claim 5, wherein the pure water guide cloth at the outermost layer is an outer layer guide cloth, the long-side glue line on the outer layer guide cloth is a first long-side glue line, one end of the first long-side glue line, which is far away from the concentrated water pipe, extends out of the outer layer guide cloth, and the length of the first long-side glue line extending out of the outer layer guide cloth is not less than the perimeter of the outer side surface formed by the rolled pure water guide cloth.
7. The roll type reverse osmosis membrane element manufacturing method according to any one of claims 1 to 6, wherein the reverse osmosis membrane, the water inlet separation net and the pure water guide cloth form a plurality of reverse osmosis membrane groups, the reverse osmosis membrane groups are laminated and adhered to one another, an inner membrane group is positioned at an inner layer in adjacent reverse osmosis membrane groups, and an outer membrane group is positioned at an outer layer in adjacent reverse osmosis membrane groups.
8. The manufacturing method of the rolled reverse osmosis membrane element according to claim 7, wherein the specific steps of laminating and sticking the adjacent reverse osmosis membrane groups are as follows:
and adhering the side surface of the pure water guide cloth of the inner membrane group, which is opposite to the first membrane, to the reverse surface of the second membrane of the outer membrane group to form a pure water flow channel with a pure water outlet positioned on the outer side surface.
9. The method of manufacturing a rolled reverse osmosis membrane element according to claim 7, wherein the inner membrane sheet group is offset from the outer membrane sheet group in a direction away from the concentrated water pipe when the inner membrane sheet group is laminated and adhered to the outer membrane sheet group.
10. The method of manufacturing a spiral wound reverse osmosis membrane element according to claim 9, wherein the inner membrane sheet group is displaced from the outer membrane sheet group in a direction away from the concentrate pipe by a distance L, the outer circumference of the concentrate pipe is D, and the number of reverse osmosis membrane sheet groups is n, where L is D/n.
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| CN115738730B (en) * | 2022-11-28 | 2024-02-20 | 珠海格力电器股份有限公司 | Rolling type reverse osmosis membrane element and water purifier with same |
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