CN114452824A - Membrane element and preparation method thereof, filter element and water purifier - Google Patents
Membrane element and preparation method thereof, filter element and water purifier Download PDFInfo
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- 239000012528 membrane Substances 0.000 title claims abstract description 238
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 127
- 238000002360 preparation method Methods 0.000 title abstract description 10
- 238000004519 manufacturing process Methods 0.000 claims abstract description 20
- 230000035699 permeability Effects 0.000 claims abstract description 10
- 239000011159 matrix material Substances 0.000 claims description 54
- 238000001223 reverse osmosis Methods 0.000 claims description 13
- 238000001728 nano-filtration Methods 0.000 claims description 7
- 230000004888 barrier function Effects 0.000 claims description 4
- 239000002131 composite material Substances 0.000 claims description 3
- 238000013329 compounding Methods 0.000 claims description 2
- 238000000926 separation method Methods 0.000 abstract description 28
- 230000000694 effects Effects 0.000 abstract description 10
- 230000002035 prolonged effect Effects 0.000 abstract description 8
- 239000013618 particulate matter Substances 0.000 abstract description 3
- 239000010410 layer Substances 0.000 description 120
- 239000010408 film Substances 0.000 description 23
- 230000014759 maintenance of location Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 239000010409 thin film Substances 0.000 description 5
- 230000003373 anti-fouling effect Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- 238000000151 deposition Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000004745 nonwoven fabric Substances 0.000 description 4
- 229920002492 poly(sulfone) Polymers 0.000 description 4
- 229920000728 polyester Polymers 0.000 description 4
- 238000001125 extrusion Methods 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 238000007639 printing Methods 0.000 description 3
- 238000009991 scouring Methods 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- 239000004952 Polyamide Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229920002401 polyacrylamide Polymers 0.000 description 2
- 229920002647 polyamide Polymers 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 230000002457 bidirectional effect Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000005001 laminate film Substances 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 239000002346 layers by function Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000037361 pathway Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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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
- B01D63/10—Spiral-wound membrane modules
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/02—Reverse osmosis; Hyperfiltration ; Nanofiltration
- B01D61/025—Reverse osmosis; Hyperfiltration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/02—Reverse osmosis; Hyperfiltration ; Nanofiltration
- B01D61/027—Nanofiltration
-
- 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
-
- 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
- C02F1/442—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Water Supply & Treatment (AREA)
- Nanotechnology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Organic Chemistry (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention discloses a membrane element, which comprises a base layer, a loose supporting layer and a membrane layer which are sequentially laid, wherein a plurality of bulges with water permeability are arranged on one side of the base layer facing the membrane layer and one side of the loose supporting layer departing from the base layer; the projections on the base layer are located on the surface of the membrane element and can space adjacent layers of the membrane element apart to form an axial water flow path when the membrane element is wrapped around the central tube. The membrane element replaces the traditional water inlet separation net and the traditional water production separation net through the bulges on the surface of the membrane element, the permeability (water permeability) is reserved by the bulges, the membrane area is increased to a certain extent, the effects of reducing the clearance of the membrane and reducing the water flow resistance are achieved, the pressure drop and the particulate matter capturing condition are reduced to a great extent, and the service life of the membrane element is prolonged. The invention provides a preparation method of a membrane element. The invention also provides a filter element and a water purifier, and by using the membrane element, the water yield and the water yield of the membrane element are greatly improved.
Description
Technical Field
The invention relates to the technical field of membrane elements, in particular to a membrane element, a preparation method thereof, a filter element and a water purifier.
Background
At present, traditional membrane element filter cores in the market, such as reverse osmosis membrane filter cores, are formed by winding a reverse osmosis membrane, an inlet water separation net and an outlet water separation net around a central pipe. The water inlet separation net and the reverse osmosis membrane form a laminated structure, and adjacent membranes are separated by the water inlet separation net to form a water flow passage for axial flow of the fluid through the membrane element. The production water barrier is used to move fluid passing through the membrane to the path of the base pipe to allow fluid to flow through the production water pathway into the base pipe after passing through the reverse osmosis membrane. While such a spacer mesh is necessary to maintain open and uniform axial flow between the laminated structures, it is also a source of flow restriction and pressure drop within the axial flow channels. Because traditional reverse osmosis membrane adopts into water and separates the net and produce water and separate the net, two-layer net that separates all is latticed structure tiling between two-layer diaphragm, and rivers form the route and must pierce through and separate the net, consequently separate the net can restrict rivers and form the region with membrane contact in the runner, increase the pressure drop to lead to the condition such as biological growth, incrustation scale formation and granule seizure are showing can appear separating net department, can accelerate membrane pollution. Meanwhile, due to the limitations of water flow resistance, processing, material characteristics and the like, the thicknesses of the water inlet separation net and the water production separation net are limited and cannot be thinner, so that space waste is caused, and the water production efficiency is reduced.
Therefore, there is a need for further improvements and improvements to membrane elements that address the above-mentioned deficiencies of the prior art.
Disclosure of Invention
The invention aims to provide a membrane element, a preparation method thereof, a filter element and a water purifier, which aim to solve the problems that a separation net structure of the traditional membrane element can limit water flow and form a region contacting with a membrane in a flow channel, so that the pressure drop is increased, and the membrane pollution is accelerated.
In order to achieve the purpose, the invention provides the following scheme:
the invention provides a membrane element, which comprises a base layer, a loose supporting layer and a membrane layer which are sequentially laid, wherein a plurality of bulges with water permeability are arranged on one side of the base layer, which faces towards the membrane layer, and one side of the loose supporting layer, which is far away from the base layer; wherein the protrusions of the base layer disposed on a side of the membrane layer facing the membrane layer are capable of spacing adjacent layers of the membrane element when the membrane element is wrapped around a central tube to form an axial water flow path.
Optionally, the membrane element is a reverse osmosis membrane or a nanofiltration membrane.
Optionally, when the membrane element is a reverse osmosis membrane, the base layer is a polyester non-woven fabric base layer, the loosening support layer is a polysulfone support layer, and the film layer is a polyacrylamide layer.
Optionally, when the membrane element is a nanofiltration membrane, the base layer is a polyester non-woven fabric base layer, and the loose supporting layer is a polysulfone supporting layer; the film layer is a polyamide layer.
Optionally, the loose supporting layer and the film layer are laid on both sides of the base layer from inside to outside; the two sides of the base layer and one side of any one of the loose supporting layers, which is far away from the base layer, are provided with a plurality of bulges.
Optionally, the protrusions are dot-shaped protrusions, and the plurality of dot-shaped protrusions on the base layer and the plurality of dot-shaped protrusions on the loose supporting layer are arranged in a dot matrix structure;
or the protrusions are discontinuous linear protrusions, and the plurality of discontinuous linear protrusions on the base layer and the plurality of discontinuous linear protrusions on the loosening supporting layer are arranged in a linear array structure;
or the bulges are a combination of point-shaped bulges and discontinuous linear bulges, and the bulges on the base layer and the bulges on the loosening supporting layer are arranged in a dotted line matrix structure.
Optionally, the protrusions are continuous line protrusions, and the plurality of continuous line protrusions on the base layer and the plurality of continuous line protrusions on the loose supporting layer are all arranged in a line matrix structure.
Optionally, the continuous line protrusions are linear protrusions and/or wavy protrusions.
Optionally, the height of the raised protrusions is smaller than the thickness of the water inlet separation net and the water production separation net.
Meanwhile, the invention provides a preparation method based on the membrane element, which comprises the following steps:
directly compounding the membrane layer, the loose support layer with the protrusions, and the base layer with the protrusions to form the membrane element;
or after the base layer and the loose supporting layer are compositely processed to form a combined body, processing the protrusions on the combined body; then the assembly with the bulges and the film layer are subjected to composite processing to form the film element;
or after the base layer, the loose supporting layer and the film layer are compositely processed to form a film element preform, the protrusions are processed on the film element preform to form the film element.
Meanwhile, the invention provides a filter element, which comprises a central tube and the membrane element, wherein the membrane element is wound on the periphery of the central tube to form a roll type laminated structure.
Meanwhile, the invention provides a water purifier, which comprises a filter element, wherein the filter element comprises the membrane element.
Compared with the prior art, the invention has the following technical effects:
the membrane element provided by the invention comprises a base layer, a loose supporting layer and a membrane layer which are sequentially laid, wherein a plurality of bulges with water permeability are arranged on one side of the base layer facing the membrane layer and one side of the loose supporting layer departing from the base layer; the protrusions on the base layer are located on the surface of the membrane element and can separate adjacent membrane elements to form axial water flow paths when the membrane elements are wrapped around the central tube. The membrane element replaces the traditional water inlet separation net and the traditional water production separation net by the bulges on the surface of the membrane element, the permeability (water permeability) of the bulge structure is reserved, the membrane area is increased to a certain extent, and the effects of reducing the membrane clearance and reducing the water flow resistance are achieved, so that the bulge part is an open channel, a closed space is not formed, the pressure drop and the particulate matter capture condition are greatly reduced, the service life of the membrane element is prolonged, and the membrane element is suitable for reverse osmosis or nanofiltration. In conclusion, the invention solves the problems that the traditional membrane element has a separation net structure which can limit water flow in a flow passage and form a region contacted with a membrane, thereby increasing pressure drop and accelerating membrane pollution.
In the membrane element, the height of the raised bulge is smaller than the thickness of the water inlet separation net and the water production separation net in the traditional membrane, so that the gap between the membranes can be reduced when the membrane element is arranged in a rolled lamination manner, the normal working water flow passage of the membrane can be met, meanwhile, under the same pressure condition, the gap between the membranes is reduced, the water flow passage is reduced, the water flow speed is increased, and when the membrane element works, water flow has a scouring effect on the surface of the membrane, so that the service life of the membrane element can be effectively prolonged. In addition, the gap between two adjacent membranes is larger due to the water inlet separation net and the water production separation net in the traditional membrane element, the height of the bulge in the membrane element is smaller than the thickness of the water inlet separation net and the water production separation net in the traditional membrane, the gap between the membranes is reduced, and the membrane element with the same volume can be wound with more turns of membrane elements, so that the surface area of the membrane element is increased, and the water yield of the membrane element is improved.
According to the preparation method of the membrane element, the bulge is not directly sprayed or printed or deposited on the surface of the membrane element, and the bulge is arranged in a spraying or printing or depositing manner, so that the surface area of the membrane element can be occupied by attachments on the surface of the membrane, and the area of the membrane element is reduced.
The filter element and the water purifier provided by the invention can greatly improve the water yield and the water yield of the membrane element and can also improve the anti-fouling and anti-blocking capacity of the membrane.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic structural view of a membrane element according to an embodiment of the present disclosure;
FIG. 2 is a schematic cross-sectional view of a membrane element according to an embodiment of the disclosure;
FIG. 3 is a schematic view of an installation structure of a membrane element according to an embodiment of the present disclosure;
FIG. 4 is a schematic structural diagram of a film element based on a dot matrix protrusion structure according to an embodiment of the disclosure;
fig. 5, 6 and 7 are schematic structural views of three different forms of film elements based on linear array projection structures, according to the embodiment of the present invention;
FIG. 8 is a structural diagram of a membrane element based on a dot and line array projection structure according to an embodiment of the present disclosure;
FIG. 9 is a schematic structural diagram of a membrane element based on a linear projection array configuration as disclosed in an embodiment of the present invention;
FIG. 10 is a structural diagram of a membrane element based on a wave line convex array structure according to an embodiment of the disclosure.
Wherein the reference numerals are:
100. a membrane element;
1. a base layer;
2. loosening the supporting layer;
3. a thin film layer;
4. a protrusion; 41. a dot-shaped bulge; 42. an interrupted linear protrusion; 43. continuous line bulges;
200. a central tube.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
One of the objectives of the present invention is to provide a membrane element to solve the problems of the traditional membrane element that the mesh structure can restrict the water flow in the flow channel and form the area contacting with the membrane, thereby increasing the pressure drop and accelerating the membrane pollution.
The invention also aims to provide a preparation method based on the membrane element.
Still another object of the present invention is to provide a filter element comprising the membrane element.
Still another object of the present invention is to provide a water purifier including a filter element having the membrane element.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Example one
As shown in fig. 1 to 4, the present embodiment provides a membrane element 100, which includes a base layer 1, a loose support layer 2 and a thin film layer 3, which are sequentially laid, wherein a plurality of protrusions 4 with water permeability are respectively disposed on a side of the base layer 1 facing the thin film layer 3 and a side of the loose support layer 2 facing away from the base layer 1; wherein the protrusions 4 provided on the side of the base layer 1 facing the membrane layer 3 are capable of spacing two adjacent layers of membrane elements 100 apart to form an axial water flow path when the membrane elements 100 are wrapped around the central tube 200. Among them, the thin film layer 3 is a functional layer having a true separating function, and is generally provided as an ultra-thin film structure having a thickness of about 0.2 μm (micrometer).
In this embodiment, the protrusions 4 are preferably arranged as dot-shaped protrusions 41, and the dot-shaped protrusions 41 on the base layer 1 and the dot-shaped protrusions 41 on the loose support layer 2 are arranged in a lattice structure. The lattice structure may be a linear matrix, so that a linear matrix protrusion is formed on the surface of the membrane element 100, the membrane element 100 having the linear matrix protrusion is wound around the central tube 200 to form a roll type laminated structure, and the linear matrix protrusion replaces the conventional membrane element water inlet barrier net and water production barrier net to separate the adjacent two membrane elements 100, so that the membrane element 100 has a desired strength, and a water flow path can be formed between the membrane elements 100.
As shown in fig. 2, a loose supporting layer 2 and a film layer 3 are laid on both sides of a base layer 1 from inside to outside; a plurality of punctiform protrusions 41 are arranged on both sides of the base layer 1 and on one side of any loose supporting layer 2, which is far away from the base layer 1, so that linear matrix protrusions are formed on both sides of the membrane element 100, and the membrane element 100 has a bidirectional linear matrix protrusion structure. The arrangement of the bi-directional linear matrix protrusion structure can further improve the structural strength and membrane contact area of the membrane element 100 when the above roll type laminated structure is formed, thereby improving the water yield and water production rate of the membrane element 100.
In this embodiment, the dot-shaped protrusions 41 may be in the shape of a cylinder dot, a prism dot, or other dot-shaped structures. The specific linear matrix mode is various, and only simple adjustment of the matrix size or the matrix mode is within the protection scope of the technical scheme.
In this embodiment, the linear matrix protrusions on the surface of the membrane elements 100 serve to separate two adjacent membrane elements 100, and serve as water flow guiding passages, so that the water flow passages of the water flow in the membrane elements 100 can be changed by the linear matrix protrusions with different shapes, the water flow passages can be prolonged, and the retention time of the water flow on the surface of the membrane can be increased.
In this embodiment, the height of the dot-shaped protrusions 41 is smaller than the thickness of the conventional water inlet and water production separation net, and the normal working water flow path of the membrane can be satisfied. Therefore, under the same pressure condition, the diaphragm clearance is reduced, the water flow passage is reduced, the water flow speed is increased, and when the membrane element works, the water flow has a scouring effect on the membrane surface, so that the service life of the membrane element 100 is prolonged.
In this embodiment, the membrane element 100 may be a reverse osmosis membrane or a nanofiltration membrane depending on the material. Such as: when the membrane element 100 is used as a reverse osmosis membrane (RO), the base layer 1 is preferably a polyester nonwoven fabric base layer, the porous support layer 2 is preferably a polysulfone support layer, and the membrane layer 3 is preferably a polyacrylamide layer; when the membrane element 100 is used as a nanofiltration membrane (NF), the base layer 1 is preferably a polyester non-woven fabric base layer, the loose support layer 2 is preferably a polysulfone support layer, and the membrane layer 3 is preferably a polyamide layer, and generally the thickness of the membrane layer 3 is smaller than that of the membrane layer 3 in the reverse osmosis membrane. The reverse osmosis membrane and the nanofiltration membrane are both the existing filtration membrane elements, and the differences between the two are mainly different in filtration precision, salt rejection and proportion of generated wastewater, and are not described in detail herein.
The thickness of each layer of the traditional membrane element is uniform, the whole processed membrane element is consistent in thickness, and the membrane element of the embodiment enables the base layer 1 and the loose supporting layer 2 to have the linear matrix bulge structure by adjusting the local thickness (namely, the bulge 4) of the base layer 1 and the loose supporting layer 2, so that the effect that the two sides of the membrane element have the linear matrix bulge structure is achieved. The membrane element 100 provided by the embodiment with the linear matrix bulges on the surface replaces the traditional water inlet separation net and water production separation net by the linear matrix bulges formed by the point bulges 41 on the surface of the membrane element, so that the effects of reducing the membrane gap and reducing the water flow resistance are achieved, the water yield of the membrane element 100 is greatly increased, the integral volume of the membrane is not changed, the change of the raw water yield is little or unchanged, and the water yield of the membrane element can be improved.
Furthermore, traditional film element adopts into water and separates the net and produce water and separate the net, and two-layer net that separates all is latticed structure tiling between two-layer diaphragm, and rivers form the route and must pierce through and separate the net, consequently separate the interior restriction rivers of net meeting runner again, increase the pressure drop, can appear biological growth, incrustation scale formation and the particle capture condition such as showing at the net department of separating simultaneously, can accelerate membrane pollution. The linear matrix bulges of the embodiment are open passages, and closed spaces are not formed, so that the pressure drop and the particulate matter capture are greatly reduced, and the service life of the membrane element is prolonged.
In addition, due to the reason of the water inlet separation net and the water production separation net, the gap between two adjacent membranes is larger, and the membrane element 100 with the same volume can be wound with more turns in the embodiment, so that the surface area of the membrane element 100 is increased, and the water yield of the membrane element 100 is improved.
Example two
As shown in fig. 5 to 7, the present embodiment provides a film element 100 having linear matrix protrusions on the surface, which is different from the first embodiment only in that the protrusions 4 are provided as intermittent linear protrusions 42, that is, the linear matrix protrusions are linear array structures formed by the intermittent linear protrusions 42. The other structures and functions of the membrane element 100 are the same as those of the first embodiment, and are not described in detail herein.
In the present embodiment, the intermittent linear protrusions 42 are linear protrusions, which may be arranged obliquely as shown in fig. 5, or may be arranged in a staggered manner as shown in fig. 6; the intermittent linear protrusions 42 may also be linear protrusions or curvilinear protrusions, such as the linear matrix of linear protrusions shown in fig. 7.
The linear matrix projections formed by the intermittent linear projections 42 form a larger membrane area than the linear matrix projections formed by the dot-shaped projections 41 in the first embodiment, and the paths for guiding the water flow in the membrane element 100 are different. The linear matrix bulges with different shapes can change the water flow passage of water flow in the membrane element 100, prolong the water flow passage and increase the retention time of the water flow on the surface of the membrane.
EXAMPLE III
As shown in fig. 8, the present embodiment provides a film element 100 having linear matrix protrusions on the surface, which is different from the first and second embodiments only in that the protrusions 4 are a mixture of dot-shaped protrusions 41 and discontinuous linear protrusions 42, that is, the linear matrix protrusions are dot-line matrix structures formed by the dot-shaped protrusions 41 and the discontinuous linear protrusions 42. The other structures and functions of the membrane element 100 are the same as those of the first embodiment, and are not described in detail herein.
In this embodiment, the dot-shaped protrusions 41 and the discontinuous linear protrusions 42 may be arranged as shown in fig. 6 to form a dot-line matrix structure. Compared with the linear matrix bulges formed by the dot-shaped bulges 41 in the first embodiment and the linear matrix bulges formed by the interrupted linear bulges 42 in the second embodiment, the dotted line matrix structure guides the water flow to be more disordered in the membrane element 100, so that the retention time of the water flow in the membrane element 100 can be further prolonged, and the water yield can be increased. The linear matrix bulges with different shapes can change the water flow passage of water flow in the membrane element 100, prolong the water flow passage and increase the retention time of the water flow on the surface of the membrane.
Example four
As shown in fig. 9 and 10, the present embodiment provides a membrane element 100 having linear matrix protrusions on the surface, which is different from the second embodiment only in that the protrusions 4 are continuous line protrusions 43, that is, the linear matrix protrusions are line matrix structures composed of the continuous line protrusions 43. The other structures and functions of the membrane element 100 are the same as those of the first embodiment, and are not described in detail herein.
In this embodiment, the continuous line protrusions 43 may be linear protrusions, wavy protrusions, or a mixture thereof. Based on the linear matrix projections formed by the continuous line projections 43, compared with the linear matrix projections formed by the interrupted projections in the first embodiment and the second embodiment, the path for guiding the water flow in the membrane element 100 is directional, and a fixed water flow guiding path is formed between any two adjacent continuous line projections 43, as shown in fig. 9, the linear continuous line projections 43 are obliquely arranged, so that a water flow path rotating around the membrane can be formed on the membrane element 100 after being wound; as shown in fig. 10, the water flow path formed between the wavy continuous linear protrusions 43 is a spiral of S-shaped waves, and both the water flow path rotating around the membrane and the water flow path revolving in S-shaped waves are advantageous in prolonging the retention time of the water flow in the membrane element 100 and increasing the water yield and water production efficiency. The linear matrix bulges with different shapes can change the water flow passage of water flow in the membrane element 100, prolong the water flow passage and increase the retention time of the water flow on the surface of the membrane.
EXAMPLE five
In this embodiment, a preparation method of the membrane element 100 according to any one of the first to fourth embodiments is provided, in which the composite layers of the membrane element 100 are the same as those of a conventional membrane element sheet, the middle of the membrane element sheet is a base layer 1, a loose support layer 2 is coated on the outer side of the base layer 1, and a membrane layer 3 is coated on the outer side of the loose support layer 2. The difference from the conventional membrane element is that the conventional membrane element is a flat membrane, the membrane sheet surface has no structure, and the membrane element 100 of the present embodiment has a linear matrix convex structure on the surface. The linear matrix protrusions are formed in various ways:
first, a film layer 3, a loose support layer 2 having protrusions 4 (or linear matrix protrusions), and a base layer 1 having protrusions 4 (or linear matrix protrusions) are directly composite-processed to form a film element 100;
secondly, after a base layer 1 and a loose supporting layer 2 are compositely processed to form a combined body, processing a protrusion 4 (or a linear matrix protrusion) on the combined body by rolling or mould pressing and other technologies; then the assembly with the bulges 4 (or linear matrix bulges) and the film layer 3 are compounded to form the film element 100;
thirdly, after the base layer 1, the loose supporting layer 2 and the film layer 3 are compositely processed to form a film element 100 preform, the protrusions 4 (or linear matrix protrusions) are processed on the film element 100 preform by a rolling or pressing technique to form the film element 100.
The preparation method of the membrane element 100 provided in this embodiment can be directly using the base layer 1 and the loose support layer 2 having linear matrix protrusions; also can realize through the roll extrusion to each layer respectively when production, can roll extrusion to basic unit 1 and loose supporting layer 2, then laminate film layer 3, also can concentrate the roll extrusion after the three-layer complex finishes. Compared with the method of directly spraying or printing or depositing linear matrix bulges on the surfaces of the membrane elements, the method has the advantages that the surface area of the membrane elements can be occupied by the attachments on the surfaces of the membrane elements in a spraying or printing or depositing mode, the area of the membrane elements is reduced, the membrane elements are directly processed on the membrane, no substance is additionally added, the surface area of the membrane elements 100 is not affected, the bulges on the surfaces of the membrane elements still have permeability, and the area of the membrane can be increased to a certain extent.
In practice, there are many different ways of forming, and this example is only used as a detailed description, and the forming scheme obtained by adjusting the principle or processing mode is within the protection scope of the present technical scheme.
EXAMPLE six
The present embodiment proposes a filter cartridge including a center tube 200 and a membrane element 100 according to any one of the first to fourth embodiments, wherein the membrane element 100 is wound around the center tube 200 to form a roll-type laminated structure.
The filter element provided by the embodiment can greatly improve the water yield and the water yield of the membrane element and can improve the anti-fouling and anti-blocking capacity of the membrane by using the membrane element 100.
EXAMPLE seven
This embodiment proposes a water purifier including a filter element having a membrane element 100 as in any one of the first to fourth embodiments.
The water purifier provided by the embodiment can greatly improve the water yield and the water yield of the membrane element and can improve the anti-fouling and anti-blocking capacity of the membrane by using the membrane element 100.
In conclusion, the novel membrane element 100 provided by the technical scheme is a membrane element with high flux, high water yield and fouling resistance. The surface of the diaphragm is provided with a linear matrix convex structure by changing the processing technology of the diaphragm, and the linear matrix convex structure on the surface of the diaphragm replaces the original water inlet separation net and water production separation net, so that the gap between the diaphragms is reduced, the area of the diaphragm is increased, and the effect of increasing the water yield is achieved. Meanwhile, because no separation net blocks between the membranes, the gaps between the membranes are small, so that the water flow speed between the membranes is improved, the membranes have a scouring effect in a water making process, the time for depositing impurities in raw water is shortened, the anti-fouling and anti-blocking effect is achieved, and the service life of the membranes is prolonged.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein, and any reference signs in the claims are not intended to be construed as limiting the claim concerned.
The principle and the implementation mode of the invention are explained by applying a specific example, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (10)
1. The membrane element is characterized by comprising a base layer, a loose supporting layer and a membrane layer which are sequentially laid, wherein a plurality of bulges with water permeability are arranged on one side of the base layer facing the membrane layer and one side of the loose supporting layer departing from the base layer; wherein the protrusions of the base layer disposed on a side thereof facing the membrane layer are capable of spacing adjacent layers of the membrane elements apart to form an axial water flow path when the membrane elements are wound around a central tube.
2. A membrane element as claimed in claim 1, wherein the membrane element is a reverse osmosis or nanofiltration membrane.
3. A membrane element as claimed in claim 1 or 2, wherein the loose support layer and the membrane layer are laid on both sides of the base layer from the inside out; the two sides of the base layer and one side of any one of the loose supporting layers, which is far away from the base layer, are provided with a plurality of bulges.
4. A membrane element as claimed in claim 1 or 2, characterized in that the protrusions are point-like protrusions, a number of which on the base layer and on the loose supporting layer are arranged in a lattice structure;
or the protrusions are discontinuous linear protrusions, and the plurality of discontinuous linear protrusions on the base layer and the plurality of discontinuous linear protrusions on the loosening supporting layer are arranged in a linear array structure;
or the bulges are a combination of point-shaped bulges and discontinuous linear bulges, and the bulges on the base layer and the bulges on the loosening supporting layer are arranged in a dotted line matrix structure.
5. A membrane element as claimed in claim 1 or 2, wherein the projections are continuous line projections, and wherein a plurality of the continuous line projections on the base layer and a plurality of the continuous line projections on the porous support layer are arranged in a line matrix configuration.
6. A membrane element as claimed in claim 5, characterized in that the continuous line protrusions are straight line protrusions and/or wave line protrusions.
7. A membrane element as claimed in claim 1 or 2, characterized in that the elevation of the elevation is smaller than the thickness of the water inlet and water production barriers.
8. A method of manufacturing a membrane element according to any one of claims 1 to 7, comprising:
directly compounding the membrane layer, the loose support layer with the protrusions, and the base layer with the protrusions to form the membrane element;
or after the base layer and the loose supporting layer are compositely processed to form a combined body, processing the protrusions on the combined body; then the assembly with the bulges and the film layer are subjected to composite processing to form the film element;
or after the base layer, the loose supporting layer and the film layer are compositely processed to form a film element preform, the protrusion is processed on the film element preform to form the film element.
9. A filter element comprising a center tube and a membrane element according to any one of claims 1 to 7, wherein the membrane element is wound around the center tube to form a roll-type laminated structure.
10. A water purifier comprising a filter element, wherein the filter element comprises the membrane element according to any one of claims 1 to 7.
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