CN115738731A - Roll type reverse osmosis membrane element and water purifier with same - Google Patents
Roll type reverse osmosis membrane element and water purifier with same Download PDFInfo
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- CN115738731A CN115738731A CN202211502202.7A CN202211502202A CN115738731A CN 115738731 A CN115738731 A CN 115738731A CN 202211502202 A CN202211502202 A CN 202211502202A CN 115738731 A CN115738731 A CN 115738731A
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- 239000012528 membrane Substances 0.000 title claims abstract description 374
- 238000001223 reverse osmosis Methods 0.000 title claims abstract description 339
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 318
- 238000000926 separation method Methods 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 4
- 230000010287 polarization Effects 0.000 abstract description 17
- 230000002035 prolonged effect Effects 0.000 abstract description 7
- 239000002131 composite material Substances 0.000 description 12
- 238000000746 purification Methods 0.000 description 9
- 239000012530 fluid Substances 0.000 description 8
- 238000005096 rolling process Methods 0.000 description 7
- 210000001503 joint Anatomy 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000007789 sealing Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000004744 fabric Substances 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000008213 purified water Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000002352 surface water Substances 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 roll type reverse osmosis membrane element and a water purifier with the same, wherein the roll type reverse osmosis membrane element comprises: the water supply device comprises a central pipe, a first reverse osmosis membrane unit and a second reverse osmosis membrane unit, wherein the first reverse osmosis membrane unit comprises n1 first reverse osmosis membranes, the first reverse osmosis membranes are folded to form a first opening, the second reverse osmosis membrane unit comprises n2 second reverse osmosis membranes, the second reverse osmosis membranes are folded to form a second opening, the first reverse osmosis membrane unit and the second reverse osmosis membrane unit are butted together in a mode that the first opening is opposite to the second opening, the water is coiled integrally to the central pipe, the raw water flows to the second reverse osmosis membrane unit through the first reverse osmosis membrane unit, and the flow cross-sectional area s1 of the first reverse osmosis membrane unit is larger than the flow cross-sectional area s2 of the second reverse osmosis membrane unit. According to the invention, the membrane surface flow rate of the concentrated water side can be increased, the concentration polarization of the concentrated water side is slowed down, the anti-pollution performance of the reverse osmosis membrane is improved, and the service life of the reverse osmosis membrane filter element is prolonged.
Description
Technical Field
The invention relates to the technical field of water purifiers, in particular to a roll type reverse osmosis membrane element and a water purifier with the same.
Background
The roll type reverse osmosis membrane element forms a water purification element by rolling the water inlet separation net, the reverse osmosis membrane and the pure water diversion part on the central water production pipe. By utilizing the permeation function of the reverse osmosis membrane, water molecules in the raw water permeate through the reverse osmosis membrane under the pressurization condition and are gathered at the pure water side to form pure water, the raw water gradually forms concentrated water at 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. Along with the flowing of raw water in the raw water channel to the concentrated water outlet, as part of raw water is filtered by the reverse osmosis membrane and then is changed into pure water for output, the fluid flow rate of the surface of the reverse osmosis membrane in the raw water channel is gradually reduced, and the fluid flow rate of the membrane surface at the concentrated water side is the lowest. Because the flow velocity of the fluid on the membrane surface is gradually reduced and the solute in the fluid on the membrane surface is gradually increased, the concentration polarization on the concentrated water side is the most serious, and the pollution blockage is easily caused. The concentration polarization phenomenon of a general reverse osmosis membrane element on the concentrated water side is obvious, and the service life of the membrane element is influenced.
The invention provides a roll type reverse osmosis membrane element and a water purifier with the same, which are researched and designed because the membrane surface water flow speed in a raw water flow channel of the roll type reverse osmosis membrane element in the prior art is gradually reduced along with the flow process, the concentration polarization of the downstream section in the flow direction is the most serious, the pollution blockage is most easily caused, and the like.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the defects that concentration polarization is most serious and pollution blockage is easily caused in the downstream section in the flow direction in the raw water flow channel of the roll type reverse osmosis membrane element in the prior art, so that the roll type reverse osmosis membrane element and the water purifier with the same are provided.
In order to solve the above problems, the present invention provides a roll type reverse osmosis membrane element, comprising:
the device comprises a central pipe, a first reverse osmosis membrane unit and a second reverse osmosis membrane unit, wherein the first reverse osmosis membrane unit comprises n1 first reverse osmosis membranes, the first reverse osmosis membranes are folded to form a first opening, the second reverse osmosis membrane unit comprises n2 second reverse osmosis membranes, the second reverse osmosis membranes are folded to form a second opening, the first reverse osmosis membrane unit and the second reverse osmosis membrane unit are connected together in a butt joint mode in which the first opening is opposite to the second opening, the first reverse osmosis membrane unit and the second reverse osmosis membrane unit are integrally rolled on the central pipe, raw water flows to the second reverse osmosis membrane unit through the first reverse osmosis membrane unit, and the flow cross-sectional area s1 of the first reverse osmosis membrane unit is larger than the flow cross-sectional area s2 of the second reverse osmosis membrane unit.
In some embodiments, 1.5. Ltoreq. S1/s 2. Ltoreq.4.
In some embodiments, the folded n1 first reverse osmosis membranes are stacked to form the first reverse osmosis membrane unit, the n1 first reverse osmosis membranes have the same first opening orientation, the folded n2 second reverse osmosis membranes are stacked to form the second reverse osmosis membrane unit, the n2 second reverse osmosis membranes have the same second opening orientation, and n1 is greater than n2.
In some embodiments, 1.5. Ltoreq. N1/n 2. Ltoreq.4.
In some embodiments, the first reverse osmosis membrane is folded to form a first raw water flow passage between the front surfaces of the two leaves, the first pure water flow passage is formed between the back surfaces of the two leaves of the first reverse osmosis membrane, the second reverse osmosis membrane is folded to form a second raw water flow passage between the front surfaces of the two leaves, the second pure water flow passage is formed between the back surfaces of the two leaves of the second reverse osmosis membrane, the first raw water flow passage is communicated with the second raw water flow passage, and the flow cross-sectional area of n1 first raw water flow passages is larger than the flow cross-sectional area of n2 second raw water flow passages.
In some embodiments, a first water inlet separation net is arranged in the first raw water channel, a second water inlet separation net is arranged in the second raw water channel, a first pure water diversion part is arranged in the first pure water channel, and a second pure water diversion part is arranged in the second pure water channel.
In some embodiments, the second reverse osmosis membrane unit is wrapped around the outer perimeter of the first reverse osmosis membrane unit such that raw water flows from the first reverse osmosis membrane unit to the second reverse osmosis membrane unit in a direction spiraling outward in a circumferential direction;
the first hem orientation of first reverse osmosis diaphragm the center tube and with the center tube meets, first opening is kept away from the center tube, the folded second hem that forms of second reverse osmosis diaphragm is kept away from first reverse osmosis diaphragm, n2 the second opening and n1 first opening meets and communicates.
In some embodiments, a first water inlet is provided at a position relatively close to the central pipe at one axial end of the first reverse osmosis membrane along an axial direction of the central pipe, the first water inlet communicating with the first raw water flow passage, and the first opening at the circumferential outer end of the first reverse osmosis membrane is formed as a first concentrated water outlet;
the second opening at the innermost circumferential end of the second reverse osmosis membrane is formed into a second water inlet which is communicated with the second raw water flow channel, a second concentrated water outlet is arranged at a position, relatively close to the second folding edge, of one axial end of the second reverse osmosis membrane, and the first water inlet and the second concentrated water outlet are respectively positioned at different ends of the membrane along the axial direction; the second pure water flow channel is communicated with the first pure water flow channel, the first pure water flow channel is communicated with the inside of the central tube, a second pure water port is formed at one axial end of the central tube, and a first pure water port is formed at the second flange.
In some embodiments, the first reverse osmosis membrane unit is wound around the periphery of the second reverse osmosis membrane unit such that raw water flows from the first reverse osmosis membrane unit to the second reverse osmosis membrane unit in a circumferentially spiraling inward direction;
the first hem of first reverse osmosis diaphragm is for keeping away from the circumference outer end of center tube, n1 first opening and n2 the second opening meets and communicates, the second hem orientation of second reverse osmosis diaphragm the center tube and with the center tube meets.
In some embodiments, a first water inlet is provided at a position relatively close to the first folded edge at one axial end of the first reverse osmosis membrane along an axial direction of the central pipe, the first water inlet is communicated with the first raw water flow passage, and the first opening at a circumferential inner end of the first reverse osmosis membrane is formed as a first concentrated water outlet;
the second opening at the circumferential outermost end of the second reverse osmosis membrane is formed into a second water inlet which is communicated with the second raw water flow channel, a second concentrated water outlet is arranged at a position, relatively close to the second folding edge, of one axial end of the second reverse osmosis membrane, and the first water inlet and the second concentrated water outlet are respectively positioned at different ends of the membrane along the axial direction;
the second pure water flow channel is communicated with the first pure water flow channel, the second pure water flow channel is communicated with the inside of the central tube, a second pure water port is formed at one axial end of the central tube, and a first pure water port is formed at the first folding edge.
The invention also provides a water purifier which comprises the roll type reverse osmosis membrane element.
The roll type reverse osmosis membrane element and the water purifier with the same have the following beneficial effects:
according to the invention, the first reverse osmosis membrane unit comprises n1 first reverse osmosis membranes, the first reverse osmosis membranes are folded to form a first opening, the second reverse osmosis membrane unit comprises n2 second reverse osmosis membranes, and the second reverse osmosis membranes are folded to form a second opening, so that the first opening is in butt joint with the second opening, the flow area s1 of a raw water channel of the first reverse osmosis membrane unit is larger than the flow area s2 of a raw water channel of the second reverse osmosis membrane unit, the flow cross section area of a fluid can be effectively reduced along the flow direction of the raw water, the flow rate of the fluid can be increased, the concentration polarization of a concentrated water side is slowed down, the anti-pollution performance of a reverse osmosis membrane is improved, and the service life of a reverse osmosis membrane filter element is prolonged; the invention effectively reduces the size of the inlet channel of the concentrated water side by folding the long and short pages and rolling the membrane, effectively improves the membrane surface flow rate of the concentrated water side, further slows down the concentration polarization of the concentrated water side, improves the anti-pollution performance of the reverse osmosis membrane, and prolongs the service life of the reverse osmosis membrane filter element.
Drawings
Fig. 1 is a schematic view of a roll membrane scheme of example 1 of a composite roll type reverse osmosis membrane element of the present invention (a view in a projection plane of an axial end face of a center tube, i.e., a view in a cross section of the center tube);
FIG. 2 is a schematic view of a flow channel of the composite roll type reverse osmosis membrane element of example 1 according to the present invention;
fig. 3 is a schematic view of a roll membrane scheme of example 2 of the composite roll type reverse osmosis membrane element of the present invention (a view in a projection plane of an axial end face of a center tube, i.e., a view in a cross section of the center tube);
fig. 4 is a flow channel schematic diagram of the composite roll type reverse osmosis membrane element of embodiment 2 of the invention.
The reference numerals are represented as:
100. a central tube; 200. a first reverse osmosis membrane unit; 201. a first reverse osmosis membrane; 202. a first opening; 203. a first folded edge; 300. a second reverse osmosis membrane unit; 301. a second reverse osmosis membrane; 302. a second opening; 303. a second folded edge; 401. a first raw water flow passage; 402. a second raw water flow passage; 501. a first pure water flow passage; 502. a second pure water flow passage; 601. a first water inlet separation net; 602. a second water inlet separation net; 701. a first pure water guide part; 702. a second pure water diversion part; 801. a first water inlet; 802. a first concentrated water outlet; 803. a second water inlet; 804. a second concentrated water outlet; 805. a first purified water port; 806. a second purified water port.
Detailed Description
As shown in fig. 1-4, the present invention provides a roll-type reverse osmosis membrane element comprising:
the reverse osmosis membrane unit comprises a central tube 100, a first reverse osmosis membrane unit 200 and a second reverse osmosis membrane unit 300, wherein the first reverse osmosis membrane unit 200 comprises n1 first reverse osmosis membranes 201, the first reverse osmosis membranes 201 are folded to form a first opening 202, the second reverse osmosis membrane unit 300 comprises n2 second reverse osmosis membranes 301, the second reverse osmosis membranes 301 are folded to form a second opening 302, the first reverse osmosis membrane unit 200 and the second reverse osmosis membrane unit 300 are butted together in a mode that the first opening 202 is opposite to the second opening 302 and are integrally rolled on the central tube 100 (the first opening is in sealing butt joint with the second opening, the inside of the central tube is communicated), so that raw water flows to the second reverse osmosis membrane unit 300 through the first reverse osmosis membrane unit 200, and the flow cross-sectional area s1 of the first reverse osmosis membrane unit 200 is larger than the flow cross-sectional area s2 of the second reverse osmosis membrane unit 300.
According to the invention, the first reverse osmosis membrane unit comprises n1 first reverse osmosis membranes, the first reverse osmosis membranes are folded to form a first opening, the second reverse osmosis membrane unit comprises n2 second reverse osmosis membranes, and the second reverse osmosis membranes are folded to form a second opening, so that the first opening is in butt joint with the second opening, the flow area s1 of a raw water channel of the first reverse osmosis membrane unit is larger than the flow area s2 of a raw water channel of the second reverse osmosis membrane unit, the flow cross section area of a fluid can be effectively reduced along the flow direction of the raw water, the flow rate of the fluid can be increased, the concentration polarization of a concentrated water side is slowed down, the anti-pollution performance of a reverse osmosis membrane is improved, and the service life of a reverse osmosis membrane filter element is prolonged; the invention effectively reduces the size of the inlet channel of the concentrated water side by folding the long and short pages and rolling the membrane, effectively improves the membrane surface flow rate of the concentrated water side, further slows down the concentration polarization of the concentrated water side, improves the anti-pollution performance of the reverse osmosis membrane, and prolongs the service life of the reverse osmosis membrane filter element.
The invention provides a composite reverse osmosis membrane element which at least comprises a central tube and two reverse osmosis membrane units, wherein the central tube is concentrically wound by a first reverse osmosis membrane unit and a second reverse osmosis membrane unit. And the first concentrated water port of the first reverse osmosis membrane unit is communicated with the second water port of the second reverse osmosis membrane unit. The size of the raw water channel on the concentrated water side is reduced by the composite film rolling mode, the membrane surface flow rate of the concentrated water side is improved, the concentration polarization of the concentrated water side is slowed down, the pollution resistance of the reverse osmosis membrane is improved, and the service life of the reverse osmosis membrane filter element is prolonged.
The reverse osmosis membrane element comprises two reverse osmosis membrane units which are wound on the same central pipe and are concentrically wound, namely a first reverse osmosis membrane unit and a second reverse osmosis membrane unit are concentrically wound on the central pipe. The concentrated water port of the first reverse osmosis membrane unit and the water inlet of the second reverse osmosis membrane unit are connected in the rolling process (namely, the first opening is in butt joint with the second opening). The two reverse osmosis membrane units are sequentially wound on the same central pipe, and the first reverse osmosis membrane unit can be wound on the inner side (embodiment 1) or the second reverse osmosis membrane unit can be wound on the inner side (embodiment 2). The membrane surface flow rate of the reverse osmosis membrane concentrated water side can be improved, the concentration polarization of the concentrated water side is slowed down, the pollution resistance of the reverse osmosis membrane is improved, and the service life of a reverse osmosis membrane filter element is prolonged.
In some embodiments, 1.5. Ltoreq. S1/s 2. Ltoreq.4. The cross-sectional area of the raw water flow channel of the first reverse osmosis membrane element is s1, which is larger than the cross-sectional area of the raw water flow channel of the second reverse osmosis membrane element is s2, and s1/s2 is preferably more than or equal to 1.5 and less than or equal to 4. This relationship, namely 1.5. Through the arrangement of the size relation, the invention can effectively ensure that the flow cross-sectional area is reduced in the flowing process of raw water, thereby increasing the flow velocity of the membrane surface, further reducing concentration polarization, having better effect, and improving the water purification rate (preventing the condition that the flow velocity is too large and the water purification effect is not good) on the basis.
In some embodiments, the folded n1 first reverse osmosis membranes 201 are stacked to form the first reverse osmosis membrane unit 200, the first openings 202 formed by the n1 first reverse osmosis membranes 201 are all oriented in the same direction, the folded n2 second reverse osmosis membranes 301 are stacked to form the second reverse osmosis membrane unit 300, the second openings 302 formed by the n2 second reverse osmosis membranes 301 are all oriented in the same direction, and n1 is greater than n2. According to the invention, the number n1 of the first reverse osmosis membranes in the first reverse osmosis membrane unit is preferably larger than the number n2 of the second reverse osmosis membranes, so that the number of the membranes in the raw water flowing direction can be reduced through the change of the number of the membranes on the basis of the same structure of the reverse osmosis membranes, the effective reduction of the flow cross-sectional area can be realized, the flow speed is improved, and the concentration polarization is reduced.
In some embodiments, 1.5. Ltoreq. N1/n 2. Ltoreq.4. This is the preferred ratio relation of the number between the first reverse osmosis membrane and the second reverse osmosis membrane of the present invention, and this relation is 1.5. Through the arrangement of the size relation, the invention can effectively ensure that the number of the membranes circulating in the flowing process of raw water is reduced, and further the circulating cross section area is reduced, so that the flow velocity of the membrane surface is increased, further concentration polarization is reduced, the effect is better, and the water purification rate can be improved on the basis (the situation that the flow velocity is too large and the water purification effect is not good is prevented).
In some embodiments, the first reverse osmosis membrane 201 is folded to form a first raw water channel 401 between the front surfaces of two leaves, the first pure water channel 501 is formed between the back surfaces of the two leaves of the first reverse osmosis membrane 201, the second reverse osmosis membrane 301 is folded to form a second raw water channel 402 between the front surfaces of the two leaves, the second pure water channel 502 is formed between the back surfaces of the two leaves of the second reverse osmosis membrane 301, the second pure water channel 502 is communicated with the first pure water channel 501, the first raw water channel 401 is communicated with the second raw water channel 402, and the flow cross-sectional area of n1 of the first raw water channels 401 is greater than the flow cross-sectional area of n2 of the second raw water channels 402.
The preferred structure form of the raw water channel and the pure water channel composed of two membranes of the invention is that the first raw water channel is communicated with the second raw water channel, and the flow cross-sectional area of n1 first raw water channels 401 is larger than the flow cross-sectional area of n2 second raw water channels 402, so that the number of membranes through which raw water flows when entering the second membrane from the first membrane is reduced, and the flow cross-sectional area is further reduced, thereby increasing the flow speed of the membrane surface, and further reducing the concentration polarization.
In some embodiments, a first water inlet screen 601 is disposed in the first raw water channel 401, a second water inlet screen 602 is disposed in the second raw water channel 402, a first pure water guide 701 (preferably a guide cloth) is disposed in the first pure water channel 501, and a second pure water guide 702 (preferably a guide cloth) is disposed in the second pure water channel 502. The invention can form the space of the raw water runner through the arrangement of the water inlet separation net, and the pure water flow guide part can effectively form the space for pure water to flow.
As shown in fig. 1-2, example 1, in some embodiments, the second reverse osmosis membrane unit 300 is wrapped around the outer perimeter of the first reverse osmosis membrane unit 200 such that raw water flows from the first reverse osmosis membrane unit 200 to the second reverse osmosis membrane unit 300 in a direction spiraling outward in the circumferential direction;
the first folded edge 203 of the first reverse osmosis membrane 201 faces the central pipe 100 and is connected with the central pipe 100, the first opening 202 is far away from the central pipe 100, the second folded edge 303 formed by folding the second reverse osmosis membrane 301 is far away from the first reverse osmosis membrane 201, n2 second openings 302 are connected with n1 first openings 202 and communicated, and the second reverse osmosis membrane 301 is wound on the periphery of the first reverse osmosis membrane 201.
This is a preferable structure form of embodiment 1 of the present invention, that is, the second reverse osmosis membrane unit is wound around the outer periphery of the first reverse osmosis membrane unit, so that the raw water flows to the second reverse osmosis membrane unit from the first reverse osmosis membrane unit at the inner side in the outward spiral direction, and the filtration and purification of the water are effectively realized.
In some embodiments, along the axial direction of the central pipe 100, a first water inlet 801 is provided at one axial end of the first reverse osmosis membrane 201 relatively close to the central pipe 100, the first water inlet 801 is communicated with the first raw water flow channel 401, and the first opening 202 at the circumferential outer end of the first reverse osmosis membrane 201 is formed as a first concentrate outlet 802;
the second opening 302 at the circumferential innermost end of the second reverse osmosis membrane 301 is formed as a second water inlet 803, the second water inlet 803 is communicated with the second raw water channel 402, a second concentrated water outlet 804 is arranged at a position, relatively close to the second flange 303, of one axial end of the second reverse osmosis membrane 301, and the first water inlet 801 and the second concentrated water outlet 804 are respectively located at different ends of the membrane along the axial direction; the second pure water flow passage 502 is communicated with the first pure water flow passage 501, the first pure water flow passage 501 is communicated with the inside of the central tube 100, a second pure water port 806 is formed at one axial end of the central tube 100, and a first pure water port 805 is formed at the second flange 303.
The flow channel and the arrangement form of the water gaps are shown in embodiment 1 of the invention, that is, the first water inlet and the second concentrated water gap are arranged at two axial ends of the membrane, the first water inlet is close to the central tube, the second concentrated water gap is close to the second folded edge, the flowing length and volume of raw water in the first reverse osmosis membrane and the second reverse osmosis membrane can be effectively increased, so that the water purification efficiency is increased, the first pure water gap is the second folded edge, so that the raw water enters the back of the second reverse osmosis membrane through the first pure water gap and can be led out through a pipeline, and the inner central tube is communicated with the first pure water channel and the second pure water channel to effectively receive and discharge pure water.
Example 1, as in fig. 1-2:
a composite reverse osmosis membrane element at least comprises a central tube and two reverse osmosis membrane units, and is characterized in that the central tube is concentrically coiled by a first reverse osmosis membrane unit and a second reverse osmosis membrane unit. And the first concentrated water port of the first reverse osmosis membrane unit is communicated with the second water port of the second reverse osmosis membrane unit.
Preferably, the cross-sectional area of the raw water flow passage of the first reverse osmosis membrane element is s1 larger than that of the raw water flow passage of the second reverse osmosis membrane element is s2, and preferably 1.5 ≤ s1/s2 ≤ 4.
Preferably, the number n1 of reverse osmosis membranes of the first reverse osmosis membrane element is greater than the number n2 of reverse osmosis membranes of the second reverse osmosis membrane element, preferably 1.5. Ltoreq. N1/n 2. Ltoreq.4.
The first reverse osmosis membrane unit is characterized by comprising a first pure water flow guide part, a first reverse osmosis membrane and a first water inlet separation net which are rolled on a central pipe, wherein the first water inlet grid and the first pure water flow guide part are respectively positioned in a raw water flow channel formed by the front surface of the first reverse osmosis membrane after being folded and a water production flow channel formed by the adjacent back surface of the first reverse osmosis membrane. The opening that first reverse osmosis membrane fifty percent discount formed dorsad the center tube, the raw water runner of first reverse osmosis membrane unit is sealed with the first side long limit part of hem vertically and is forming the raw water inlet in the one end that is close to the hem, the raw water runner of first reverse osmosis membrane unit is sealed all with the second side long limit of hem vertically and is formed the minor face relative with the hem as first dense water export. The minor face of first pure water conservancy diversion portion with the center tube is connected, two long limits after first reverse osmosis membrane is folding with keep away from the minor face of center tube all with first pure water conservancy diversion portion sealing connection forms first pure water runner, the first pure water export of first pure water runner with the center tube intercommunication, the center tube is used for collecting the pure water of first reverse osmosis membrane list output.
The second reverse osmosis membrane unit is characterized by comprising a second pure water diversion part, a second reverse osmosis membrane and a second water inlet separation net which are rolled on the first reverse osmosis membrane unit, wherein the second water inlet grid and the second pure water diversion part are respectively positioned in a raw water channel formed by the front surface and a water production channel formed by the adjacent back surface after the second reverse osmosis membrane is folded. An opening formed by folding the second reverse osmosis membrane is towards the first reverse osmosis membrane unit, and a short side of the second water inlet grid positioned at the folding opening of the second reverse osmosis membrane is connected with the first reverse osmosis membrane element to form a second water inlet; and a first side long edge of the raw water channel of the second reverse osmosis membrane unit, which is vertical to the folded edge, is completely sealed, and a second side long edge of the raw water channel of the second reverse osmosis membrane unit, which is vertical to the folded edge, is partially sealed and forms a second concentrated water outlet at one end close to the folded edge.
According to the invention, the sectional area of the raw water flow channel at the concentrated water side is reduced in a composite membrane rolling mode, the membrane surface flow rate at the concentrated water side is improved, further the concentration polarization at the concentrated water side is slowed down, the pollution resistance of the reverse osmosis membrane is improved, and the service life of the reverse osmosis membrane filter element is prolonged.
3-4, example 2, in some embodiments the first reverse osmosis membrane unit 200 is wrapped around the periphery of the second reverse osmosis membrane unit 300 such that raw water flows from the first reverse osmosis membrane unit 200 to the second reverse osmosis membrane unit 300 in a circumferentially spiraling inward direction;
the first folding edge 203 of the first reverse osmosis membrane 201 is far away from the circumferential outer end of the central pipe 100, n1 first openings 202 are connected and communicated with n2 second openings 302, the second folding edge 303 of the second reverse osmosis membrane 301 faces the central pipe 100 and is connected with the central pipe 100, and the first reverse osmosis membrane is wound on the periphery of the second reverse osmosis membrane.
This is the preferable structure form of embodiment 2 of the present invention, that is, the first reverse osmosis membrane unit is wound around the outer circumference of the second reverse osmosis membrane unit, so that the raw water flows to the second reverse osmosis membrane unit from the first reverse osmosis membrane unit at the outer side in the spiral inward direction, and the filtration and purification of the water are effectively realized.
In some embodiments, along the axial direction of the central tube 100, a first water inlet 801 is provided at a position where one axial end of the first reverse osmosis membrane 201 is relatively close to the first folding edge 203, the first water inlet 801 is communicated with the first raw water flow channel 401, and the first opening 202 at the circumferential inner end of the first reverse osmosis membrane 201 is formed as a first concentrated water outlet 802;
the second opening 302 at the outermost end in the circumferential direction of the second reverse osmosis membrane 301 is formed as a second water inlet 803, the second water inlet 803 is communicated with the second raw water channel 402, a second concentrated water outlet 804 is arranged at a position, relatively close to the second flange 303, of one axial end of the second reverse osmosis membrane 301, and the first water inlet 801 and the second concentrated water outlet 804 are respectively located at different ends of the membrane in the axial direction;
the second pure water flow passage 502 is communicated with the first pure water flow passage 501, the second pure water flow passage 502 is communicated with the inside of the central tube 100, a second pure water port 806 is formed at one axial end of the central tube 100, and a first pure water port 805 is formed at the first folded edge 203.
The flow channel and the arrangement form of the water gaps are shown in embodiment 2 of the invention, that is, the first water inlet and the second concentrated water gap are arranged at two axial ends of the membrane, the first water inlet is close to the first folded edge, the second concentrated water gap is close to the central tube, the flowing length and volume of raw water in the first reverse osmosis membrane and the second reverse osmosis membrane can be effectively increased, so that the water purification efficiency is increased, the first pure water gap is the first folded edge, so that the raw water enters the back surface of the first reverse osmosis membrane through the first pure water gap and can be led out through a pipeline, and the inner part of the central tube is communicated with the first pure water flow channel and the second pure water flow channel to effectively receive and discharge pure water.
Example 2, as in fig. 3-4:
a composite reverse osmosis membrane element at least comprises a central tube and two reverse osmosis membrane units, and is characterized in that the central tube is concentrically coiled by a first reverse osmosis membrane unit and a second reverse osmosis membrane unit. And the first concentrated water port of the first reverse osmosis membrane unit is communicated with the second water port of the second reverse osmosis membrane unit.
Preferably, the cross-sectional area of the raw water flow passage of the first reverse osmosis membrane element is s1 larger than that of the raw water flow passage of the second reverse osmosis membrane element is s2, and preferably 1.5 ≤ s1/s2 ≤ 4.
Preferably, the number n1 of reverse osmosis membranes of the first reverse osmosis membrane element is greater than the number n2 of reverse osmosis membranes of the second reverse osmosis membrane element, preferably 1.5. Ltoreq. N1/n 2. Ltoreq.4.
The second reverse osmosis membrane unit is characterized by comprising a second pure water diversion part, a second reverse osmosis membrane and a second water inlet separation net which are rolled on the central pipe, wherein the second water inlet grid and the second pure water diversion part are respectively positioned in a raw water flow channel formed by the front surface and a water production flow channel formed by the adjacent back surface of the second reverse osmosis membrane after being folded. The opening that the fifty percent discount of second reverse osmosis diaphragm formed is dorsad the center tube, the raw water runner of second reverse osmosis membrane unit is sealed with the second side long limit part of hem vertically and is forming the raw water inlet at the one end that is close to the hem, the raw water runner of second reverse osmosis membrane unit is sealed with the whole minor face that forms of the second side long limit relative with the hem as the second dense water export. The minor face of second pure water conservancy diversion portion with the center tube is connected, two long limits after the second reverse osmosis membrane is folding with keep away from the minor face of center tube all with second pure water conservancy diversion portion sealing connection forms the second pure water runner, the second pure water export of second pure water runner with the center tube intercommunication, the center tube is used for collecting the pure water of second reverse osmosis membrane list output.
The first reverse osmosis membrane unit is characterized by comprising a first pure water diversion part, a first reverse osmosis membrane and a first water inlet separation net which are rolled on the second reverse osmosis membrane unit, wherein the first water inlet grid and the first pure water diversion part are respectively positioned in a raw water channel formed by the front surface of the first reverse osmosis membrane after being folded and a water production channel formed by the adjacent back surface. An opening formed by folding the first reverse osmosis membrane is towards the second reverse osmosis membrane unit, and the short side of the first water inlet grid positioned at the folding opening of the first reverse osmosis membrane is connected with the second reverse osmosis membrane element to form a first concentrated water port; the water inlet structure is characterized in that a first side long edge of a raw water channel of the first reverse osmosis membrane unit, which is vertical to the folded edge, is completely sealed, a second side long edge of the raw water channel of the first reverse osmosis membrane unit, which is vertical to the folded edge, is partially sealed, and a first water inlet is formed at one end close to the folded edge. The short sides of the first pure water flow guide part are connected with the second reverse osmosis membrane element, the two long sides of the folded first reverse osmosis membrane and the short sides close to the second reverse osmosis membrane element are both connected with the first pure water flow guide part in a sealing mode to form a first pure water flow channel, and a first pure water outlet of the first pure water flow channel is located on the outer side of the whole composite roll type reverse osmosis membrane element.
The short sides of the second pure water flow guide part are connected with the first reverse osmosis membrane element, the two folded long sides of the second reverse osmosis membrane and the short sides close to the first reverse osmosis membrane element are both connected with the second pure water flow guide part in a sealing mode to form a second pure water flow channel, and a second pure water outlet of the second pure water flow channel is located on the outer side of the whole composite roll type reverse osmosis membrane element.
According to the invention, the sectional area of the raw water flow channel at the concentrated water side is reduced in a composite membrane rolling mode, the membrane surface flow rate at the concentrated water side is improved, further the concentration polarization at the concentrated water side is slowed down, the pollution resistance of the reverse osmosis membrane is improved, and the service life of the reverse osmosis membrane filter element is prolonged.
The invention also provides a water purifier which comprises the roll type reverse osmosis membrane element. Namely, the invention also comprises a water purifier with the reverse osmosis membrane element.
The above description is intended to be illustrative of the preferred embodiment of the present invention and should not be taken as limiting the invention, but rather, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, it is possible to make various improvements and modifications without departing from the technical principle of the present invention, and those improvements and modifications should be also considered as the protection scope of the present invention.
Claims (11)
1. A roll-type reverse osmosis membrane element is characterized in that: the method comprises the following steps:
the reverse osmosis membrane unit comprises a central tube (100), a first reverse osmosis membrane unit (200) and a second reverse osmosis membrane unit (300), wherein the first reverse osmosis membrane unit (200) comprises n1 first reverse osmosis membranes (201), the first reverse osmosis membranes (201) are folded to form a first opening (202), the second reverse osmosis membrane unit (300) comprises n2 second reverse osmosis membranes (301), the second reverse osmosis membranes (301) are folded to form a second opening (302), the first reverse osmosis membrane unit (200) and the second reverse osmosis membrane unit (300) are butted together in a mode that the first opening (202) is opposite to the second opening (302) and are integrally rolled onto the central tube (100), so that raw water flows to the second reverse osmosis membrane unit (300) through the first reverse osmosis membrane unit (200), and the flow cross-sectional area s1 of the first reverse osmosis membrane unit (200) is larger than the flow cross-sectional area s2 of the second reverse osmosis membrane unit (300).
2. The rolled reverse osmosis membrane element of claim 1, wherein:
1.5≤s1/s2≤4。
3. the rolled reverse osmosis membrane element of claim 1 or 2, wherein:
the folded n1 first reverse osmosis membranes (201) are overlapped to form the first reverse osmosis membrane unit (200), the orientations of first openings (202) formed by the n1 first reverse osmosis membranes (201) are the same, the folded n2 second reverse osmosis membranes (301) are overlapped to form the second reverse osmosis membrane unit (300), the orientations of second openings (302) formed by the n2 second reverse osmosis membranes (301) are the same, and n1 is larger than n2.
4. The rolled reverse osmosis membrane element of claim 3, wherein:
1.5≤n1/n2≤4。
5. the roll-type reverse osmosis membrane element of any one of claims 1-4, wherein:
the membrane separation device is characterized in that the first reverse osmosis membrane (201) is folded to form a first raw water flow channel (401) between the front surfaces of the two membrane pages, a first pure water flow channel (501) is formed between the back surfaces of the two membrane pages of the first reverse osmosis membrane (201), the second reverse osmosis membrane (301) is folded to form a second raw water flow channel (402) between the front surfaces of the two membrane pages, a second pure water flow channel (502) is formed between the back surfaces of the two membrane pages of the second reverse osmosis membrane (301), the first raw water flow channel (401) is communicated with the second raw water flow channel (402), and the flow cross-sectional area of n1 first raw water flow channels (401) is larger than that of n2 second raw water flow channels (402).
6. The rolled reverse osmosis membrane element of claim 5, wherein:
the water purifier is characterized in that a first water inlet separation net (601) is arranged in the first raw water runner (401), a second water inlet separation net (602) is arranged in the second raw water runner (402), a first pure water diversion part (701) is arranged in the first pure water runner (501), and a second pure water diversion part (702) is arranged in the second pure water runner (502).
7. The rolled reverse osmosis membrane element of claim 5, wherein:
the second reverse osmosis membrane unit (300) is wound around the outer periphery of the first reverse osmosis membrane unit (200) such that raw water flows from the first reverse osmosis membrane unit (200) to the second reverse osmosis membrane unit (300) in a direction spiraling outward in the circumferential direction;
the first folding edge (203) of the first reverse osmosis membrane (201) faces the central pipe (100) and is connected with the central pipe (100), the first opening (202) is far away from the central pipe (100), the second folding edge (303) formed by folding the second reverse osmosis membrane (301) is far away from the first reverse osmosis membrane (201), and n2 second openings (302) are connected with n1 first openings (202) and communicated with each other.
8. The rolled reverse osmosis membrane element of claim 7, wherein:
a first water inlet (801) is arranged at a position, which is relatively close to the central pipe (100), of one axial end of the first reverse osmosis membrane (201) along the axial direction of the central pipe (100), the first water inlet (801) is communicated with the first raw water flow channel (401), and the first opening (202) of the circumferential outer end of the first reverse osmosis membrane (201) is formed into a first concentrated water outlet (802);
the second opening (302) at the circumferential innermost end of the second reverse osmosis membrane (301) is formed into a second water inlet (803), the second water inlet (803) is communicated with the second raw water flow channel (402), a second concentrated water outlet (804) is arranged at a position, relatively close to the second flange (303), of one axial end of the second reverse osmosis membrane (301), and the first water inlet (801) and the second concentrated water outlet (804) are respectively located at different ends of the membrane along the axial direction; the second pure water flow channel (502) is communicated with the first pure water flow channel (501), the first pure water flow channel (501) is communicated with the inside of the central tube (100), a second pure water port (806) is formed at one axial end of the central tube (100), and a first pure water port (805) is formed at the position of the second folding edge (303).
9. The rolled reverse osmosis membrane element of claim 5, wherein:
the first reverse osmosis membrane unit (200) is wound around the outer periphery of the second reverse osmosis membrane unit (300) such that raw water flows from the first reverse osmosis membrane unit (200) to the second reverse osmosis membrane unit (300) in a direction spiraling inward in the circumferential direction;
the first folding edge (203) of the first reverse osmosis membrane (201) is far away from the circumferential outer end of the central pipe (100), the n1 first openings (202) are connected and communicated with the n2 second openings (302), and the second folding edge (303) of the second reverse osmosis membrane (301) faces the central pipe (100) and is connected with the central pipe (100).
10. The rolled reverse osmosis membrane element of claim 9, wherein:
a first water inlet (801) is formed in the position, along the axial direction of the central pipe (100), of one axial end of the first reverse osmosis membrane (201) relatively close to the first folding edge (203), the first water inlet (801) is communicated with the first raw water flow channel (401), and a first opening (202) at the circumferential inner end of the first reverse osmosis membrane (201) is formed into a first concentrated water outlet (802);
the second opening (302) at the outermost end in the circumferential direction of the second reverse osmosis membrane (301) is formed as a second water inlet (803), the second water inlet (803) is communicated with the second raw water flow channel (402), a second concentrated water outlet (804) is arranged at a position, relatively close to the second flange (303), of one axial end of the second reverse osmosis membrane (301), and the first water inlet (801) and the second concentrated water outlet (804) are respectively located at different ends of the membrane in the axial direction;
the second pure water flow channel (502) is communicated with the first pure water flow channel (501), the second pure water flow channel (502) is communicated with the inside of the central pipe (100), a second pure water port (806) is formed at one axial end of the central pipe (100), and a first pure water port (805) is formed at the first folding edge (203).
11. A water purifier, which is characterized in that: comprising the roll-type reverse osmosis membrane element of any one of claims 1-10.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
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