CN113120994B

CN113120994B - Reverse osmosis filter element, manufacturing method thereof, filter element assembly and water purifier

Info

Publication number: CN113120994B
Application number: CN201911412609.9A
Authority: CN
Inventors: 张辉; 官阔荣; 陈蓓; 孙兆鑫
Original assignee: Zhejiang Shaoxing Supor Domestic Electrical Appliance Co Ltd
Current assignee: Zhejiang Shaoxing Supor Domestic Electrical Appliance Co Ltd; Zhejiang Supor Kitchen and Bathroom Electrical Appliance Co Ltd
Priority date: 2019-12-31
Filing date: 2019-12-31
Publication date: 2023-07-07
Anticipated expiration: 2039-12-31
Also published as: CN113120994A

Abstract

The invention provides a reverse osmosis filter element, a manufacturing method thereof, a filter element assembly and a water purifier. The reverse osmosis filter element comprises a central tube with a through hole on the tube wall and a membrane layer assembly wound on the central tube, wherein the membrane layer assembly comprises a first membrane, a second membrane and a dense water separation net clamped between the membranes, the membranes are provided with a winding head end, a winding tail end and a first side edge and a second side edge which are connected between the winding head end and the winding tail end, a sealant line extending along the winding tail end, the first side edge and the second side edge is arranged between the first membrane and the second membrane, the sealant line extending along the first side edge and/or the second side edge is provided with a notch at a position close to the winding tail end, the first membrane and the second membrane are adhered through the sealant line to form a membrane bag, and the membrane bag is provided with a first opening positioned at the winding head end and a second opening formed by the notch, and the first opening is communicated with the through hole on the central tube. Pure water in the filter flask can dilute ions diffusing from the membrane.

Description

Reverse osmosis filter element, manufacturing method thereof, filter element assembly and water purifier

Technical Field

The invention relates to the technical field of water purification, in particular to a reverse osmosis filter element, a manufacturing method thereof, a filter element assembly with the reverse osmosis filter element and a water purifier with the filter element assembly.

Background

With the pursuit of the quality of life of the masses, the water purifier gradually goes into the families of people. Reverse osmosis water purifiers are becoming increasingly popular because of the freshness, sanitation and safety of the purified water produced by the reverse osmosis water purifiers.

The reverse osmosis filter element is a core component of the reverse osmosis water purifier. The reverse osmosis filter element is manufactured by winding a reverse osmosis membrane on a central tube. Raw water has high TDS (total dissolved solids) and is filtered from the outer periphery of the reverse osmosis membrane, pure water generated by filtration flows into the central tube, and wastewater flows out from the end face of the reverse osmosis membrane.

After the water preparation is finished, a small amount of concentrated water is reserved in the reverse osmosis filter element in front of the reverse osmosis membrane, a large amount of unfiltered raw water is reserved in the filter flask, and a small amount of pure water is reserved in the central tube. After a long-time shutdown, according to the principle that ions diffuse from a high-concentration solution to a low-concentration solution, the ions in the concentrated water before the membrane and a large amount of ions in raw water diffuse into purified water after the membrane, so that the purified water in the central tube is polluted. And since the amount of pure water is much smaller than the amounts of raw water and concentrated water, TDS of pure water will be significantly increased by the diffusion phenomenon.

Disclosure of Invention

In order to at least partially solve the problems of the prior art, the present invention provides a reverse osmosis cartridge comprising a central tube having a plurality of through holes in the tube wall and a membrane layer assembly wound on the central tube, the membrane layer assembly comprising a first membrane sheet, a second membrane sheet and a dense water barrier sandwiched between the first membrane sheet and the second membrane sheet, the first membrane sheet and the second membrane sheet having a winding head end, a winding tail end and first and second side edges connected between the winding head end and the winding tail end, a sealant line extending along the winding tail end, the first side edge and the second side edge being provided between the first membrane sheet and the second membrane sheet, and a sealant line extending along the first side edge and/or the second side edge having a gap at a position near the winding tail end, the first membrane sheet and the second membrane sheet being bonded by the sealant line to form a membrane bag between the first membrane sheet and the second membrane sheet, the membrane bag having a plurality of through holes in the first opening and the first opening in the central tube.

It is clear from this that the reverse osmosis cartridge having the above structure retains raw water to be filtered in the center tube and a small amount of undischarged concentrated water in the membrane bag, but the storage of raw water is not large because the inner cavity volume of the center tube is small. The pure water produced by filtration is coated on the outer periphery of the reverse osmosis filter element and is far more than the total amount of raw water in the central tube and concentrated water in the membrane bag. Therefore, even if the reverse osmosis filter element is placed for a long time, the phenomenon of diffusion occurs, and the pure water can dilute the concentration of ions in the water by utilizing the advantage of stock, so that the TDS of the first water which is picked up by a user is prevented from being too high.

Illustratively, the first membrane has a first base layer and a first desalination layer on the first base layer, the second membrane has a second base layer and a second desalination layer on the second base layer, the first desalination layer and the second desalination layer are oppositely disposed, and the sealant line is located between the first desalination layer and the second desalination layer.

After entering the membrane bag, the raw water passes through the desalting layer and then permeates outside the membrane bag through the base layer. Thereby, raw water is allowed to be fed into the center tube, and pure water is collected from outside the membrane bag.

Illustratively, the center tube receives raw water, the second opening is a water concentration port, and the outer side surface of the membrane bag discharges pure water.

The center tube may have a first end and a second end opposite each other, the first end being a water inlet, the second opening of the membrane bag being on an opposite side of the membrane layer assembly from the water inlet, wherein a pore diameter of a through hole adjacent to the first end is larger than a pore diameter of a through hole adjacent to the second end among the plurality of through holes.

Thus, after the raw water enters the central tube, the raw water can enter the membrane bag more easily through the through hole near the first end due to the low pressure of the through hole with large aperture and the high pressure of the through hole with small aperture. And the second opening is arranged at the second side edge, so that raw water entering the membrane bag flows along the arrow direction, and the path of the raw water passing through the membrane bag is longer, so that the raw water can be filtered more fully, and the filtering performance of the reverse osmosis filter element with the arrangement is better.

The center tube may have a first end and a second end opposite to each other, the first end being a water inlet, the second opening of the membrane bag being on the same side of the membrane layer assembly as the water inlet, wherein a pore diameter of a through hole adjacent to the first end is smaller than a pore diameter of a through hole adjacent to the second end among the plurality of through holes.

Thus, after raw water enters the central tube, the raw water is easier to enter the membrane bag through the through hole near the second end due to the low pressure of the through hole with large aperture and the high pressure of the through hole with small aperture. And the second opening is arranged at the edge of the first side, so that raw water entering the membrane bag flows along the arrow direction, and the path of the raw water passing through the membrane bag is longer, so that the raw water can be filtered more fully, and the filtering performance of the reverse osmosis filter element with the arrangement is better.

Illustratively, the first and second membranes each comprise a reverse osmosis membrane folded in half, with a fold line located at the winding head end.

Through the diaphragm that above set up, can be under the condition that need not beat the seal line, utilize the self performance of diaphragm, prevent raw water to enter into in the clearance between two membrane bags, compare and beat the seal line, it has more stable performance, and reduced the technology, the production efficiency of improvement.

Illustratively, a first pure water screen is arranged in an interlayer formed by folding the first membrane in half, and/or a second pure water screen is arranged in an interlayer formed by folding the second membrane in half.

Therefore, pure water filtered by the membrane can smoothly flow out through a channel formed by the membrane and the pure water separation net, and the phenomenon that the flow of the reverse osmosis filter element is influenced due to the fact that the membrane layer assembly is tightly attached between the membrane and the membrane after being wound on the central tube is avoided.

Illustratively, the film layer assembly includes a plurality of sheets of the first film sheet and a plurality of sheets of the second film sheet alternately stacked, the sealant line being disposed between any adjacent half sheet of the first film sheet and half sheet of the second film sheet to form the film pouch between any adjacent half sheet of the first film sheet and half sheet of the second film sheet.

Therefore, the reverse osmosis membrane folded in multiple pages can be wound on the central tube, multiple membrane bags can be generated between the reverse osmosis membrane folded in multiple pages, the contact area of raw water and the membrane is increased, and the filtration efficiency of the reverse osmosis filter element is further improved.

Illustratively, the membrane layer assembly further comprises a first single layer reverse osmosis membrane positioned inside the innermost membrane layer and a second single layer reverse osmosis membrane positioned outside the outermost membrane layer, the first single layer reverse osmosis membrane and the innermost half-sheet membrane forming the membrane pocket, the second single layer reverse osmosis membrane and the outermost half-sheet membrane forming the membrane pocket.

The two layers of single-layer reverse osmosis membranes are respectively arranged on the innermost layer and the outermost layer of the wound filter element, so that the first membrane and the second membrane can be prevented from being scratched during winding, and meanwhile, the utilization rate of the membrane layer is improved.

Illustratively, a pure water barrier is provided on the side of the first membrane facing away from the membrane bag and/or on the side of the second membrane facing away from the membrane bag.

The purpose of the pure water barrier net is to support the outside of the membrane bag by the pure water barrier net to form a water flow channel through which pure water flows after the membrane layer assembly is wound. The membrane is prevented from being tightly attached to the membrane, pure water is prevented from flowing smoothly, and the flow rate of the reverse osmosis filter element is affected.

Illustratively, the concentrate spacer extends beyond the wound ends of the first and second diaphragms, the concentrate spacer being pre-wound on the center tube prior to winding the first and second diaphragms such that the wound ends of the first and second diaphragms are spaced from the center tube by a pre-wound portion of the concentrate spacer.

Thus, the concentrate spacer becomes the innermost layer wound around the center tube. The function is that when raw water flows out from the through hole of the central tube, as the concentrated water separation net supports a space between the membrane layer assembly and the side wall of the central tube, the raw water can fully encircle the side wall of the central tube after flowing out from the through hole, if the membrane layer assembly with a plurality of sheets of membranes is wound on the central tube, the raw water can uniformly enter each membrane bag, and the filtering capacity of the reverse osmosis filter element is improved.

Illustratively, the reverse osmosis cartridge further comprises an unwind-resistant fastener secured to an outermost periphery of the membrane layer assembly.

Because the reverse osmosis filter element has higher pressure in the application process, the anti-opening fixing piece has the function of keeping the film layer assembly in a fastening and winding state and preventing the film bag from expanding due to pressure bearing in the film and affecting the filtering performance.

According to another aspect of the present invention there is also provided a filter cartridge assembly comprising a filter flask and a reverse osmosis filter cartridge as defined in any one of the above, the reverse osmosis filter cartridge being housed within the filter flask.

According to yet another aspect of the present invention, there is also provided a water purifier including the filter element assembly as described above.

The manufacturing method of the reverse osmosis filter element comprises the steps of manufacturing a first membrane and a second membrane, wherein the first membrane and the second membrane are provided with a winding head end, a winding tail end and a first side edge and a second side edge which are connected between the winding head end and the winding tail end; applying a sealant line on the first and/or second film sheet along the winding tail end, the first side edge and the second side edge, wherein the sealant line extending along the first side edge and/or the second side edge has a notch at a position near the winding tail end; sandwiching a dense water screen between the first membrane and the second membrane; bonding the first and second films by the sealant line to form a film pouch between the first and second films; and winding the first diaphragm, the second diaphragm, and the concentrate spacer around the center tube from the winding head end.

Illustratively, the step of bonding the sealant wire includes: placing a glue blocking tool at the notch; sealing glue is applied along the winding tail end, the first side edge and the second side edge; and removing the glue blocking tool to form the sealant line.

Illustratively, the step of fabricating the first and second diaphragms includes: providing a first reverse osmosis membrane and a second reverse osmosis membrane; folding the first reverse osmosis membrane and the second reverse osmosis membrane respectively, wherein a folding line is positioned at the winding head end; and placing a first pure water screen in the interlayer of the folded first reverse osmosis membrane to form a first membrane, and placing a second pure water screen in the interlayer of the folded second reverse osmosis membrane to form a second membrane.

Illustratively, the step of applying a sealant line on the first and/or second film sheet along the tail end of the roll, the first side edge, and the second side edge includes: alternately stacking a plurality of the first films and a plurality of the second films; and (3) punching the sealant line between any adjacent half-page first membrane sheet and half-page second membrane sheet to form the membrane bag between any adjacent half-page first membrane sheet and half-page second membrane sheet.

Illustratively, after winding the first membrane, the second membrane, and the concentrate spacer around the center tube, further comprising: and fixing the film layer assembly at the outermost periphery by using a perforated adhesive tape so as to prevent unwinding.

In the summary, a series of concepts in a simplified form are introduced, which will be further described in detail in the detailed description section. This summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.

Advantages and features of the invention are described in detail below with reference to the accompanying drawings.

Drawings

The following drawings are included to provide an understanding of the invention and are incorporated in and constitute a part of this specification. Embodiments of the present invention and their description are shown in the drawings to explain the principles of the invention. In the drawings of which there are shown,

FIG. 1 is a front view of a reverse osmosis cartridge according to an exemplary embodiment of the present invention, wherein the reverse osmosis cartridge is in an expanded state;

FIG. 2 is a perspective view of a reverse osmosis cartridge according to an exemplary embodiment of the present invention, wherein the reverse osmosis cartridge is in a rolled state;

FIG. 3 is a front view of a reverse osmosis cartridge according to another exemplary embodiment of the present invention, wherein the reverse osmosis cartridge is in an expanded state;

FIG. 4 is a front view of a reverse osmosis cartridge according to yet another exemplary embodiment of the present invention, wherein the reverse osmosis cartridge is in an expanded state;

FIG. 5 is an exploded schematic view of a membrane module of a reverse osmosis cartridge according to an exemplary embodiment of the invention; and

fig. 6 is an exploded schematic view of a membrane layer assembly of a reverse osmosis cartridge according to another exemplary embodiment of the invention.

Wherein the above figures include the following reference numerals:

100. 100', 100", reverse osmosis cartridge; 300. 300', 300", membrane layer assembly; 310. 310', a first membrane; 311. a first base layer; 312. a first desalting layer; 320. 320', a second membrane; 321. a second base layer; 322. a second desalting layer; 330. a dense water separation net; 340. a pure water separation net; 341. a first pure water screen; 342. a second pure water screen; 351. a first single layer reverse osmosis membrane; 352. a second single layer reverse osmosis membrane; 400. a film bag; 410. winding a head end; 411. a first opening; 420. a winding tail end; 430. a first side edge; 440. a second side edge; 450. a sealant line; 460. a notch; 461. 461', 461", second openings.

Detailed Description

In the following description, numerous details are provided to provide a thorough understanding of the invention. However, it will be understood by those skilled in the art that the following description illustrates preferred embodiments of the invention by way of example only and that the invention may be practiced without one or more of these details. Furthermore, some technical features that are known in the art have not been described in detail in order to avoid obscuring the invention.

Illustratively, as shown in fig. 1 and 5, the present invention provides a reverse osmosis cartridge 100 comprising a central tube 200 having a plurality of through holes 210 in a wall thereof and a membrane layer assembly 300 wound around the central tube 200. Water may enter and exit the center tube 200 through the through holes 210. The membrane layer assembly 300 includes a first membrane 310, a second membrane 320, and a dense water barrier 330 sandwiched between the first membrane 310 and the second membrane 320. The dense water screen 330 may be a plastic screen with a certain thickness, or may be made of other materials, and is not particularly limited. The concentrate spacer 330 may support a space between the first membrane 310 and the second membrane 320, forming a channel allowing concentrate to flow therethrough.

Although the first diaphragm 310 and the second diaphragm 320 are described herein, the first diaphragm 310 and the second diaphragm 320 may have the same structure, and of course, may have different structures.

First and

second films

310 and 320 have a winding head end 410, a winding tail end 420, and first and second side edges 430 and 440 connected between winding head end 410 and winding tail end 420. When winding the film layer assembly 300 onto the center tube 200, the winding head end 410 is first wound onto the center tube 200, and as the center tube 200 continues to rotate about the axis, the film layer assembly 300 will gradually be wound onto the center tube 200 until the winding tail end 420 is wound onto the center tube 200.

A sealant wire 450 extending along the winding tail 420, the first side edge 430 and the second side edge 440 is also provided between the first film 310 and the second film 320, and the sealant wire 450 extending along the first side edge 430 and/or the second side edge 440 has a notch 460 near the winding tail 420.

The first and

second films

310 and 320 are bonded by a sealant line 450 to form a film pouch 400 between the first and

second films

310 and 320. The film pouch 400 is adhesively sealed on three sides by a sealant line 450, forming a first opening 411 at the winding head 410. And a second opening 461 is formed due to the presence of the notch 460. The first opening 411 is located at the winding head end 410, and the first opening 411 communicates with the plurality of through holes 210 on the central tube 200. The second opening 461 is remote from the center tube 200. The concentrate spacer 330 is positioned within the membrane bag 400 and supports the water flow channels within the membrane bag 400.

Fig. 2 shows a wound reverse osmosis filter cartridge 100 corresponding to fig. 1. The central tube 200 may be used to receive raw water. Raw water enters the membrane bag 400 from the through hole 210 through the first opening 411. The water flow will flow through the channels supported by the concentrate spacer 330 under the influence of the high pressure pump. A portion of the water flow passes through either the first diaphragm 310 or the second diaphragm 320 under pressure. The first and

second membranes

310 and 320 may block solid solubles in raw water, and only allow water molecules and a small amount of the solid solubles to permeate to the outer surfaces of the first and

second membranes

310 and 320, and the partially permeated water is pure water. Accordingly, the outer side surface of the membrane bag 400 can be used to discharge pure water. Water molecules and a great part of the solid solubles which have not penetrated out are discharged as concentrated water from the second opening 461. Since the membrane bags 400 are in a wound state, pure water will be discharged from the gap between the membrane bags and finally collected in a filter flask (not shown). The filter flask seals the base pipe 200 and membrane layer assembly 300 therein to form a filter cartridge assembly. Of course, the filter flask is provided with a water inlet, a pure water port and a concentrated water port, the water inlet is communicated with the central tube 200, the concentrated water port is communicated with the second opening 461, and the pure water port is communicated with the outer side surface of the membrane bag 400.

The raw water may enter the central tube 200 from both ends of the central tube 200 or from one end thereof. The second opening 461 may be formed at both the first side edge 430 and the second side edge 440, or may be formed at either the first side edge 430 or the second side edge 440. Which will be described in detail below in conjunction with figures 3 and 4.

To increase the water flux, one membrane layer assembly 300 is wound multiple turns around the center tube 200. During the filtration process, raw water may enter the membrane bag 400 formed by the membrane module 300 from the central tube 200 through the first opening 411, pure water flows out from the gaps between adjacent turns after being wound, and water that does not permeate out of the membrane bag 400 flows out as the second opening 461 formed by the notch 460.

As can be seen from the above, the reverse osmosis cartridge 100 having the above structure has the raw water to be filtered remaining in the central tube 200, and a small amount of non-discharged concentrated water is stored in the membrane bag 400, but the raw water is not stored in a large amount because the inner cavity volume of the central tube 200 is small. The pure water produced by filtration is coated on the outer periphery of the reverse osmosis cartridge 100, which is much larger than the total amount of raw water in the center tube 200 and concentrated water in the membrane bag 400. Therefore, even if the reverse osmosis filter element 100 is placed for a long time, the phenomenon of diffusion occurs, and pure water can dilute the concentration of ions in water by utilizing the advantage of stock, so that the TDS of the first water received by a user is prevented from being too high.

Illustratively, as shown in fig. 5, the first membrane 310 has a first base layer 311 and a first desalination layer 312 located on the first base layer 311. The second membrane 320 has a second base layer 321 and a second desalination layer 322 on the second base layer 321. The first and second desalination layers 312, 322 are disposed opposite. The sealant wire 450 is positioned between the first and second desalination layers 312, 322. Namely, the film pouch 400 bonded by the sealant line 450, the desalination layer faces the inner surface of the film pouch 400, and the base layer faces the outer surface of the film pouch 400. After the raw water enters the membrane bag 400, it passes through the desalination layer and then permeates outside the membrane bag 400 through the base layer. Thereby allowing raw water to be delivered into the center tube 200 and collecting pure water from outside the membrane bag 400.

Illustratively, the center tube 200 has opposite first and second ends 201, 202. The description will be given below taking an example in which the first end 201 of the center tube 200 and the first side edge 430 of the membrane bag 400 are on the same side, and the second end 201 of the center tube 200 and the second side edge 440 of the membrane bag 400 are on the same side.

In one embodiment, as shown in fig. 3, the first end 201 is a water inlet, the second end 202 is closed, and raw water can only enter the central tube 200 through the first end 201. The second opening 461' of the membrane bag 400 is closer to the second end 202 than the first end 201, i.e. the second opening 461' of the membrane bag 400 is located on the opposite side of the membrane layer assembly 300' from the water inlet. For example, the second opening 461' is disposed on the second side edge 440. Wherein, among the plurality of through holes 210, the aperture of the through hole 210 near the first end 201 is larger than the aperture of the through hole 210 near the second end 202.

Thus, after the raw water enters the central tube 200, the raw water will more easily enter the membrane bag through the through holes 210 near the first end 201 due to the low pressure of the through holes 210 with large apertures and the high pressure of the through holes 210 with small apertures. And the second opening 461' is provided at the second side edge 440, raw water entering the membrane bag 400 will flow in the direction of the arrow, and the path through which the raw water passes in the membrane bag 400 will be longer, so that raw water can be filtered more sufficiently, and thus the filtration performance of the reverse osmosis cartridge 100 having the above arrangement is more excellent.

In another embodiment, as shown in fig. 4, the central tube 200 has opposite first and second ends 201 and 202, the first end 201 being a water inlet, the second end 202 being closed, raw water being allowed to enter the central tube 200 only through the first end 201. The second opening 461 "of the membrane bag 400 is closer to the first end 201 than the second end 202, i.e. the second opening 461" of the membrane bag 400 is on the same side of the membrane layer assembly 300 "as the water inlet. For example, the second opening 461 "is disposed on the first side edge 430. Wherein the aperture of the through-hole 210 near the first end 201 is smaller than the aperture of the through-hole 210 near the second end 202 among the plurality of through-holes 210.

Thus, after raw water enters the central tube 200, raw water more easily enters the membrane bag through the through holes 210 near the second end 202 due to the low pressure of the through holes 210 having a large aperture and the high pressure of the through holes 210 having a small aperture. And the second opening 461″ is provided at the first side edge 430, raw water entering the membrane bag 400 will flow in the direction of the arrow, and the path through which the raw water passes in the membrane bag 400 will be longer, so that raw water can be filtered more sufficiently, and thus the filtration performance of the reverse osmosis cartridge 100 having the above arrangement is more excellent.

The first end 201, the second end 202, the first side edge 430, and the second side edge 440 described above merely illustrate the downward position in the orientation as shown, and do not represent the orientation in actual use.

As shown in fig. 5, the side of the first membrane 310 facing away from the membrane bag 400 may be provided with a pure water barrier 340. In other embodiments not shown, a pure water screen may be provided on the side of the second membrane 320 facing away from the membrane bag 400. The pure water barrier net 340 is provided in order that the outside of the membrane bag 400 is supported by the pure water barrier net 340 to form a space after the membrane layer assembly 300 is wound, forming a water flow passage through which pure water flows. The membrane is prevented from being tightly attached to the membrane, pure water is prevented from flowing smoothly, and the flow rate of the reverse osmosis filter element is affected.

If the plurality of membrane layer assemblies 300 are wound around the central tube 200, first, the membrane layer assemblies 300 are stacked in a state in which the plurality of membrane bags 400 are unfolded, then in order to prevent raw water flowing out of the through holes 210 of the central tube 200 from directly flowing out of the gap between the two attached membrane bags 400, it is necessary to further provide a sealant line at the gap between the two membrane bags 400 near one end of the central tube 200 to prevent raw water from flowing into the gap between the two membrane bags 400, resulting in mixing of raw water and filtered pure water.

Preferably, as shown in fig. 6, both the first membrane sheet 310 'and the second membrane sheet 320' comprise reverse osmosis membranes folded in half, with the fold line being located at the winding head 410. Through the diaphragm that above set up, can be under the condition of need not beating the seal line, utilize the self performance of diaphragm, prevent raw water to enter into in the clearance between two membrane bags 400, compare and beat the seal line, it has more stable performance, and reduced the technology, the production efficiency of improvement.

Illustratively, the first pure water screen 341 is disposed in the sandwich formed by folding the first membrane 310 'in half, and/or the second pure water screen 342 is disposed in the sandwich formed by folding the second membrane 320'.

The pure water screen 340 may be a plastic screen having a certain thickness, or may be made of other materials, and is not particularly limited. The pure water barrier 340 may support a space in the folded interlayer of the first membrane 310 'and the second membrane 320' to form a channel. Thus, the pure water filtered by the membrane can smoothly flow out through the channel formed by the membrane and the pure water separation net 340, so that the phenomenon that the flow of the pure water is influenced due to the tight adhesion between the membrane and the membrane after the membrane layer assembly 300 is wound on the central tube 200 is avoided.

Illustratively, the film layer assembly 300' includes a plurality of sheets of first film 310' and a plurality of sheets of second film 320' stacked alternately. Only one embodiment of a page of first membrane 310 'and a page of second membrane 320' is shown in fig. 6. After each piece of membrane is folded, the two half pieces of membrane are formed, and the two half pieces of membrane are connected at the folded position of the membrane. A sealant line 450 is provided between any adjacent half-sheet first film sheet 310 'and half-sheet second film sheet 320' to form a film pouch 400 between any adjacent half-sheet first film sheet 310 'and half-sheet second film sheet 320'. When the film layer assembly 300' includes two sheets of the first film sheet 310' and one sheet of the second film sheet 320' alternately stacked, one film pouch 400 may be formed between half sheets of the first film sheet 310' and the second film sheet 320', and another film pouch 400 may be formed between the other half sheets of the first film sheet 310' and the second film sheet 320'. The two film pockets are located on either side of the second film sheet 320'. That is, when three sheets of film are included in total, they may form two film bags 400. When four sheets of film are included in total, they may form three film bags 400, and so on.

In this way, the reverse osmosis membrane folded in multiple pages can be wound on the central tube 200, and multiple membrane bags 400 can be generated between the reverse osmosis membrane folded in multiple pages, so that the contact area of raw water and the membrane is increased, and the filtration efficiency of the reverse osmosis filter element 100 is further improved.

Illustratively, the membrane layer assembly 300 further includes a first single layer reverse osmosis membrane 351 located inboard of the innermost membrane sheet and a second single layer reverse osmosis membrane 352 located outboard of the outermost membrane sheet. In the wound state, the first single-layer reverse osmosis membrane 351 is located at the innermost layer, and the second single-layer reverse osmosis membrane 352 is located at the outermost layer. In the developed state shown in fig. 6, the first single-layer reverse osmosis membrane 351 is located at the uppermost layer, and the second single-layer reverse osmosis membrane 352 is located at the lowermost layer. The first single layer reverse osmosis membrane 351 forms a membrane pouch 400 with the innermost half-sheet membrane sheet, the second single layer reverse osmosis membrane 352 forms a membrane pouch 400 with the outermost half-sheet membrane.

Since the membrane layer assembly 300 is ultimately wound around the center tube 200, without the first single layer reverse osmosis membrane 351 and the second single layer reverse osmosis membrane 352, the half sheets of the first membrane 310 'and the second membrane 320' that do not form the membrane bag 400 will be attached to each other after winding. The desalination layer of the half of the first sheet 310 '(i.e., the upper half) faces upward and the desalination layer of the half of the second sheet 320' (i.e., the lower half) faces downward, whereby the desalination layers are easily scratched from each other during winding, and may affect the whole sheet. In addition, the two halves of the first diaphragm 310 'and the second diaphragm 320' may be underutilized. By additionally providing the first single-layer reverse osmosis membrane 351 and the second single-layer reverse osmosis membrane 352, two additional membrane bags 400 can be formed, thereby improving the utilization rate of the reverse osmosis membranes.

When two layers of reverse osmosis membranes are respectively arranged on the innermost layer and the outermost layer of the wound filter element, the first membrane 310 'and the second membrane 320' are prevented from being scratched during winding, and meanwhile, the utilization rate of the membrane layers is improved.

Illustratively, a dense water separator 330 may be disposed between the first single-layer reverse osmosis membrane 351 and the innermost membrane, and a dense water separator 330 may also be disposed between the second single-layer reverse osmosis membrane 352 and the outermost membrane, facilitating the flow of dense water.

Illustratively, the concentrate spacer 330 extends beyond the coiled ends 410 of the first and

second diaphragms

310, 320, which are pre-coiled on the base pipe 200 prior to coiling the first and

second diaphragms

310, 320 such that the coiled ends 410 of the first and

second diaphragms

310, 320 are separated from the base pipe 200 by pre-coiled portions of the concentrate spacer 330.

Typically the length of the concentrate spacer 330 that extends may be the circumference of the base pipe 200 such that the concentrate spacer 330 becomes the innermost layer that is wrapped around the base pipe 200. The function is that when raw water flows out from the through hole 210 of the central tube 200, since the dense water separation net 330 supports a space between the membrane layer assembly 300 and the side wall of the central tube 200, the raw water can fully surround the side wall of the central tube 200 after flowing out from the through hole 210, and if the membrane layer assembly 300 with a plurality of sheets is wound on the central tube 200, the raw water can uniformly enter into each sheet of membrane bags 400, thereby improving the filtering capability of the reverse osmosis filter element 100.

Illustratively, the reverse osmosis cartridge 100 further includes a unwind-proof fixture (not shown) secured to the outermost periphery of the membrane layer assembly 300. The unwinding preventing fixing member may be a water permeable adhesive tape wound around the outermost ring of the filter element or may be covers fastened to both ends of the reverse osmosis filter element 100. Because the reverse osmosis filter element 100 has higher pressure inside during application, the anti-opening fixing member has the function of keeping the membrane layer assembly 300 in a tightly wound state, and preventing the membrane bag from expanding due to pressure bearing in the membrane, thereby affecting the filtering performance.

According to another aspect of the present invention, there is also provided a filter cartridge assembly comprising a filter flask (not shown) and any one of the reverse osmosis filter cartridges 100 as described above, the reverse osmosis filter cartridge 100 being housed within the filter flask.

According to yet another aspect of the present invention, there is also provided a water purifier including any one of the filter element assemblies as described above.

The method of manufacturing the reverse osmosis cartridge 100 of the present invention is described in detail below.

Illustratively, this includes fabricating a first diaphragm 310 and a second diaphragm 320. First and

second films

310 and 320 have a winding head end 410, a winding tail end 420, and first and second side edges 430 and 440 connected between winding head end 410 and winding tail end 420. A sealant wire 450 is applied to the first film sheet 310 and/or the second film sheet 320 along the winding tail 420, the first side edge 430, and the second side edge 440, wherein the sealant wire 450 extending along the first side edge 430 and/or the second side edge 440 has a notch 460 proximate to the winding tail 420. The concentrate spacer 330 is sandwiched between the first membrane 310 and the second membrane 320. The first and

second films

310 and 320 are adhered by the sealant line 450 to form the film pouch 400 between the first and

second films

310 and 320. First diaphragm 310, second diaphragm 320, and concentrate spacer 330 are wound around center tube 200 beginning at winding head 410.

The glue line 450 may be a manual glue or a programmable glue applicator may be used to control the position of the gap 460 in the glue line 450, as will be described in more detail below.

Illustratively, the step of applying the sealant wire 450 includes: and placing a glue blocking tool at the notch 460. When the tooling is a baffle, it is placed on the film to be glued, and after positioning with the film, the sealant is applied along the tail end 420, the first side edge 430 and the second side edge 440 of the roll. After the glue is applied, the glue blocking tool is removed to form a sealant line 450, and a notch 460 is naturally formed at the position where the glue blocking tool is placed. The advantage of this approach is that the notch 460 is more precisely positioned in size and does not require modification to the original equipment or process.

Illustratively, the steps of fabricating the first and

second diaphragms

310, 320 include: providing a first reverse osmosis membrane and a second reverse osmosis membrane; folding the first reverse osmosis membrane and the second reverse osmosis membrane, respectively, with the fold line being located at the coiled head end 410; and placing a first pure water barrier 341 in the sandwich of the folded first reverse osmosis membrane to form a first membrane 310, and placing a second pure water barrier 342 in the sandwich of the folded second reverse osmosis membrane to form a second membrane 320.

Illustratively, the step of applying a sealant line 450 on the first film sheet 310 and/or the second film sheet 320 along the roll tail 420, the first side edge 430, and the second side edge 440 includes: alternately stacking a plurality of first films 310 and a plurality of second films 320; a sealant line 450 is applied between any adjacent half-sheet first film sheet 310 and half-sheet second film sheet 320 to form a film pouch 400 between any adjacent half-sheet first film sheet 310 and half-sheet second film sheet 320.

Illustratively, after the first membrane 310, the second membrane 320, and the concentrate spacer 330 are wound on the center tube 200, further comprising: the outermost periphery of the membrane layer assembly 300 is fixed with a perforated tape to prevent unwinding, while not affecting the outflow of pure water from the outer side of the membrane layer assembly 300.

In the description of the present invention, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front", "rear", "upper", "lower", "left", "right", "transverse", "vertical", "horizontal", and "top", "bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely for convenience of describing the present invention and simplifying the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, without limiting the scope of protection of the present invention; the orientation terms "inner" and "outer" refer to the inner and outer relative to the outline of the components themselves.

Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one or more components or features' spatial positional relationships to other components or features as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass not only the orientation of the elements in the figures but also different orientations in use or operation. For example, if the element in the figures is turned over entirely, elements "over" or "on" other elements or features would then be included in cases where the element is "under" or "beneath" the other elements or features. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". Moreover, these components or features may also be positioned at other different angles (e.g., rotated 90 degrees or other angles), and all such cases are intended to be encompassed herein.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, components, assemblies, and/or combinations thereof.

It should be noted that the terms "first," "second," and the like in the description and claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the present application described herein may be implemented in sequences other than those illustrated or described herein.

The present invention has been illustrated by the above-described embodiments, but it should be understood that the above-described embodiments are for purposes of illustration and description only and are not intended to limit the invention to the embodiments described. In addition, it will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that many variations and modifications are possible in light of the teachings of the invention, which variations and modifications are within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A reverse osmosis filter element comprising a central tube (200) with a plurality of through holes (210) in the wall of the tube and a membrane layer assembly (300) wound on the central tube, characterized in that the membrane layer assembly comprises a first membrane (310), a second membrane (320) and a dense water barrier (330) sandwiched between the first membrane and the second membrane,

the first and second diaphragms having a winding head end (410), a winding tail end (420), and first and second side edges (430, 440) connected between the winding head end and the winding tail end, a sealant line (450) extending along the winding tail end, the first and second side edges being provided between the first and second diaphragms, and the sealant line extending along the first and/or second side edges having a gap (460) at a position near the winding tail end,

the first and second films are bonded by the sealant line to form a film pouch (400) between the first and second films, the film pouch having a first opening (411) at the winding head end and a second opening (461) formed by the gap, the first opening communicating with a plurality of through holes on the center tube.

2. The reverse osmosis filter cartridge of claim 1, wherein the first membrane (310) has a first base layer (311) and a first desalination layer (312) on the first base layer, the second membrane (320) has a second base layer (321) and a second desalination layer (322) on the second base layer, the first and second desalination layers being disposed opposite one another, and the sealant line (450) is disposed between the first and second desalination layers.

3. The reverse osmosis cartridge according to claim 1, wherein the central tube (200) receives raw water, the second opening (461) is a concentrate outlet, and the outer side of the membrane bag (400) discharges pure water.

4. A reverse osmosis cartridge according to claim 3, wherein the central tube (200) has opposite first (201) and second (202) ends, the first end being a water inlet, the second opening (461) of the membrane bag (400) being located on opposite sides of the membrane layer assembly (300) from the water inlet, wherein the aperture of the through-hole adjacent to the first end is larger than the aperture of the through-hole adjacent to the second end in the plurality of through-holes (210).

5. A reverse osmosis cartridge according to claim 3, wherein the central tube (200) has opposite first (201) and second (202) ends, the first end being a water inlet, the second opening of the membrane bag (400) being on the same side of the membrane layer assembly (300) as the water inlet, wherein the aperture of the through-hole adjacent the first end is smaller than the aperture of the through-hole adjacent the second end in the plurality of through-holes (210).

6. The reverse osmosis cartridge of claim 1, wherein the first membrane (310) and the second membrane (320) each comprise a reverse osmosis membrane folded in half, the fold line being located at the coiled head end (410).

7. The reverse osmosis filter element according to claim 6, wherein the first membrane (310) is folded in half to form an interlayer in which a first pure water screen (341) is provided, and/or the second membrane (320) is folded in half to form an interlayer in which a second pure water screen (342) is provided.

8. The reverse osmosis filter cartridge of claim 6, wherein the membrane layer assembly (300) comprises a plurality of sheets of the first membrane sheet (310) and a plurality of sheets of the second membrane sheet (320) stacked alternately, the sealant line (450) being disposed between any adjacent half sheet of the first membrane sheet and half sheet of the second membrane sheet to form the membrane pouch (400) between any adjacent half sheet of the first membrane sheet and half sheet of the second membrane sheet.

9. The reverse osmosis cartridge of claim 6, wherein the membrane layer assembly (300) further comprises a first single layer reverse osmosis membrane (351) positioned inside the innermost membrane and a second single layer reverse osmosis membrane (352) positioned outside the outermost membrane, the first single layer reverse osmosis membrane and the innermost half-sheet membrane forming the membrane pocket (400), the second single layer reverse osmosis membrane and the outermost half-sheet membrane forming the membrane pocket.

10. The reverse osmosis cartridge of claim 1, wherein a side of the first membrane sheet (310) facing away from the membrane bag (400) and/or a side of the second membrane sheet (320) facing away from the membrane bag is provided with a pure water barrier (340).

11. The reverse osmosis cartridge of claim 1, wherein the concentrate spacer (330) extends beyond the coiled head ends (410) of the first membrane (310) and the second membrane (320), the concentrate spacer being pre-coiled on the base pipe (200) prior to coiling the first membrane and the second membrane such that the coiled head ends of the first membrane and the second membrane are separated from the base pipe by a pre-coiled portion of the concentrate spacer.

12. The reverse osmosis filter cartridge of claim 1, further comprising an unwind-proof fixture secured to an outermost periphery of the membrane layer assembly (300).

13. A filter cartridge assembly comprising a filter flask and a reverse osmosis filter cartridge according to any one of claims 1-12, the reverse osmosis filter cartridge being housed within the filter flask.

14. A water purifier comprising the cartridge assembly of claim 13.

15. A method of making a reverse osmosis cartridge comprising:

-making a first membrane (310) and a second membrane (320), said first membrane and said second membrane having a winding head (410), a winding tail (420), and a first side edge (430) and a second side edge (440) connected between said winding head and said winding tail;

-applying a sealant thread (450) on the first and/or second film sheet along the winding tail, the first side edge and the second side edge, wherein the sealant thread extending along the first side edge and/or the second side edge has a gap (460) at a position near the winding tail;

sandwiching a dense water screen (330) between the first membrane and the second membrane;

bonding the first and second films by the sealant line to form a film pouch (400) between the first and second films; and

the first diaphragm, the second diaphragm, and the concentrate spacer are wound around a center tube (200) from the winding head end.

16. The method of manufacturing of claim 15, wherein the step of bonding the sealant wire (450) comprises:

placing a glue blocking tool at the notch (460);

applying a sealant along the winding tail (420), the first side edge (430) and the second side edge (440); and

and removing the glue blocking tool to form the sealant line.

17. The method of manufacturing as claimed in claim 15, wherein the step of manufacturing the first membrane (310) and the second membrane (320) comprises:

providing a first reverse osmosis membrane and a second reverse osmosis membrane;

folding the first reverse osmosis membrane and the second reverse osmosis membrane in half, respectively, wherein a folding line is positioned at the winding head end (410); and

a first pure water screen (341) is placed in the sandwich of the folded first reverse osmosis membrane to form a first membrane sheet, and a second pure water screen (342) is placed in the sandwich of the folded second reverse osmosis membrane to form a second membrane sheet.

18. The method of manufacturing of claim 17, wherein the step of applying a sealant line (450) on the first film sheet (310) and/or the second film sheet (320) along the tail end (420), the first side edge (430), and the second side edge (440) of the roll comprises:

alternately stacking a plurality of the first films and a plurality of the second films;

the sealant lines are applied between any adjacent half-sheet first film sheet and half-sheet second film sheet to form the film pouch (400) between any adjacent half-sheet first film sheet and half-sheet second film sheet.

19. The method of manufacturing of claim 15, wherein after winding the first membrane (310), the second membrane (320), and the concentrate spacer (330) around the center tube (200), further comprising:

the perforated tape is secured to the outermost periphery of the film assembly to prevent unwinding.