CN220159665U

CN220159665U - End face converging type filter element assembly and filter element

Info

Publication number: CN220159665U
Application number: CN202321247160.7U
Authority: CN
Inventors: 王小侠
Original assignee: Hangzhou Subruichi Technology Co ltd
Current assignee: Hangzhou Subruichi Technology Co ltd
Priority date: 2022-06-21
Filing date: 2023-05-22
Publication date: 2023-12-12
Anticipated expiration: 2033-05-22
Also published as: CN114849482A; WO2023246738A1; CN219784377U

Abstract

The utility model discloses an end face converging type filter element assembly and a filter element, and belongs to the technical field of water purification. The filter element component of the utility model has the membrane bag wound on the central tube along the extending direction of the first long side; the membrane bag is formed by folding a thin base membrane along a first long edge, a first end cover is arranged at the pure water outlet end of the membrane element, and the packaging part of the first end cover is sleeved on the periphery of the membrane element; the inner cavity of the first end cover is provided with a supporting part for supporting the first long side of the thin base membrane, and a drainage water channel is formed on the supporting part for discharging pure water. Because the thin base membrane is softer in material and thin in thickness, the supporting part and the drainage water channel are arranged, the membrane element of the folding scheme is guaranteed to have longer service life, the shortening of the pure water side flow is realized, and the pure water production efficiency is improved.

Description

End face converging type filter element assembly and filter element

Technical Field

The utility model relates to the technical field of water purification, in particular to an end face converging type filter element assembly and a filter element.

Background

Along with the improvement of the living standard of people, the quality of drinking water is increasingly important. The water purifier is used as household water purifying equipment, and its core component is a filter element and mainly comprises a membrane element and a membrane shell, wherein the membrane is critical, and a raw water runner and a pure water runner are arranged on two sides of the membrane.

In the use process, raw water flows in from the raw water flow channel, becomes pure water after being filtered by reverse osmosis of the membrane, flows out from the pure water flow channel, and is longer due to the membrane winding structure. There are the following problems:

the pure water flow channel is overlong, and the water flow can receive great resistance when passing through, so that the flow rate loss is increased, the pure water quantity generated in unit time is naturally reduced, and the water production efficiency of the water purifier is directly influenced. The flow channel is longer, the inner surface area is increased, sediment is more easily accumulated, and blockage is easily generated in the using process, so that the maintenance difficulty is increased.

As in the already disclosed solution, in the solution disclosed in patent CN201810506458.2, the thicknesses of the raw water diversion net and the pure water diversion net are distributed in a gradient manner along the flow passage direction, so as to increase the drainage linear velocity of the concentrated water end and avoid the blockage of the membrane element. However, the pure water flow passage is longer, so that larger pressure loss is generated, and the water yield in unit time is difficult to increase.

When the membrane element of the water purifier is designed, the pure water flow channel is set to be of proper length, so that not only can a certain water yield be ensured, but also the generation or influence of the problems can be avoided to the greatest extent, and higher use effect and economic benefit can be obtained. The optimal design of the pure water flow channel is a key point for improving the overall performance of the water purifier.

Disclosure of Invention

1. Technical problem to be solved by the utility model

According to analysis of the prior art and the utility model patent, the utility model aims at the technical defect of overlong existing pure water flow channel, combines the thin base membrane, adopts a long-side folding mode to realize the design of the short flow channel of pure water, and has the advantages of better balancing flow velocity and pressure drop, improving water production efficiency and running performance and higher practical value.

2. Technical proposal

In order to achieve the above purpose, the technical scheme provided by the utility model is as follows:

the utility model relates to an end face confluence type filter element assembly, which comprises a central tube and a membrane element, wherein the membrane element is provided with at least one membrane bag, the membrane bag is provided with a first long side and a second long side which are opposite, the first short side and the second short side are opposite, and the membrane bag is wound on the central tube along the extending direction of the first long side;

the membrane bag is formed by folding a thin base membrane along a first long side, wherein the inner side surface of the membrane bag opposite to the first long side is a raw water side, and the outer side surface of the membrane bag is a pure water side; a raw water diversion net is arranged on the raw water side, and a pure water diversion cloth is arranged on the pure water side; during filtration, water flow can enter the raw water side from the raw water inlet, pure water formed by passing through the thin base membrane flows in the direction of the first long side and flows out from the pure water outlet end where the first long side is positioned;

the pure water outlet end of the membrane element is provided with a first end cover, and the packaging part of the first end cover is sleeved on the periphery of the membrane element; the inner cavity of the first end cover is provided with a supporting part for supporting the first long side of the thin base membrane, and a drainage water channel is formed on the supporting part for discharging pure water;

the other end of the membrane element is sleeved with a second end cover, the inner end face of the second end cover and the end face of the membrane element are at least partially sealed, and the central tube penetrates through the inner end face of the second end cover.

Further, the stiffness of the thin base membrane is 2.0-4.2 cm, and the surface of the coiled membrane bag is a substantially flat curved surface;

or: the thickness of the thin base film sheet is 0.008-0.09 mm, and the softness is 2.0-30.0 g, so that the thin base film sheet can remove wrinkles formed at the first long edge when the film is rolled; the stiffness of the thin base film sheet is 2.0-4.2 cm, and the surface of the coiled film bag is a substantially flat curved surface.

Further, on the pure water side of the film pouch, a sealing structure is formed along the first short side, the second short side, and the second long side.

Further, at the pure water outlet end of the membrane element, the outer edge of the membrane element is sealed with the first end cover by glue.

Further, a glue groove is formed in the edge of the supporting part, and the glue groove is sunken relative to the surface of the supporting part; the glue groove is filled with sealant.

Further, a confluence cavity is arranged in the first end cover, surrounds the central tube, is communicated with the drainage water channel, and pure water is discharged through the confluence cavity.

Further, the central tube is provided with a hollow pure water cavity, and the side wall of the central tube is provided with a diversion hole which is communicated with the converging cavity and the pure water cavity; the pure water cavity is communicated with the end face of the central tube and is used for discharging pure water.

Further, a partition board is arranged in the central pipe, one side of the partition board is a pure water cavity, the other side of the partition board is a water diversion cavity, and the partition board is close to the pure water outlet end; the side wall of the central tube is provided with a plurality of water diversion holes communicated with the water diversion cavity in a penetrating mode, and the water diversion holes are communicated with the raw water side of the membrane bag.

Further, the supporting part and the mounting part are in an integrated structure or are arranged in a split mode, and the drainage water channel is of a groove structure or a hole structure on the supporting part.

Further, the first end cover further comprises a mounting head, the inner side of the mounting head is connected with the central tube, and the outer wall of the mounting head is provided with a circumferential sealing groove.

Further, the sealing element is sleeved on the periphery of the membrane element or the periphery of the second end cover in an annular mode.

Further, the sealing element is a Y-shaped sealing ring, and an opening of the sealing element faces to one end of raw water inflow.

Further, the sealing element is sleeved on the periphery of the second end cover in an annular mode, a step is arranged on the second end cover, and the bottom end of the sealing element abuts against the step to limit the sliding of the sealing element in the direction of the first end cover; or:

the periphery of the membrane element is coated with a glue film, and a plurality of membrane holes are formed in the glue film and used for water inflow or drainage; the Y-shaped sealing ring is sleeved on the adhesive film, and the adhesive film in the area between the Y-shaped sealing ring and the second end cover is in a closed state.

Further, the first end cover and the second end cover are both non-metallic materials.

Further, a seal is formed at a first long side of the raw water side of the membrane bag, one short side position of the first short side or the second short side is used as a raw water inlet, the other short side position is used as a concentrated water outlet, or a local unsealed position of the second long side is used as a concentrated water outlet.

The filter element comprises the filter element assembly and further comprises a membrane shell, wherein the filter element assembly is arranged in the membrane shell.

Further, the membrane shell comprises a shell body and a shell cover, and the shell body is clamped or in threaded connection with the shell cover.

Further, a raw water interface and a pure water interface are arranged at the end part of the shell, and a concentrated water interface is arranged on a shell cover connected with the other end of the shell;

or: one end of the shell is provided with a concentrated water interface and a pure water interface, and the other end of the shell is connected with a shell cover which is provided with a raw water interface. The central tube is provided with a pure water cavity communicated with two ends, and pure water at the pure water outlet end flows out from the pure water outlet through the pure water cavity.

3. Advantageous effects

Compared with the prior art, the technical scheme provided by the utility model has the following beneficial effects:

the filter element component is characterized in that the membrane bag is formed by folding the thin base membrane along the first long side, a certain sealing structure is formed on the pure water side, and the thin base membrane is wound along the extending direction of the first long side to form the membrane element.

Drawings

FIG. 1 is a schematic illustration of one embodiment of a filter cartridge assembly;

FIG. 2 is a schematic view of a folding means of the film bag of the present utility model;

FIG. 3 is a schematic view of an expanded structure of a film bag according to the present utility model;

FIG. 4 is a schematic view of a pure water diversion net and a raw water diversion cloth;

FIG. 5 is a schematic view showing the winding effect of a conventional film after being folded on a long side;

FIG. 6 is a schematic view showing the winding effect of the membrane after folding the long side of the membrane;

FIG. 7 is a schematic view of a first end cap of the present utility model;

FIG. 8 is a schematic cross-sectional view of the end cap of FIG. 7;

FIG. 9 is a schematic view of an embodiment in which the support is removable;

FIG. 10 is a schematic illustration of a water inlet and outlet pattern of a membrane element;

FIG. 11 is a schematic illustration of a combination of a membrane element and a seal;

FIG. 12 is a schematic view of an embodiment of a seal structure of a membrane element;

FIG. 13 is a schematic view of an embodiment of a filter cartridge;

FIG. 14 is a schematic view of the seal mounted on the end cap;

FIG. 15 is a schematic view of an embodiment of a cartridge utilizing a center tube as a waterway;

FIG. 16 is a schematic view of an embodiment of a filter cartridge utilizing a center tube for water intake.

Reference numerals in the schematic drawings illustrate:

01. a raw water flow passage; 02. a pure water flow path;

1. a film bag; 100. a thin base membrane; 100a, A membrane; 100B, B diaphragms; 101. a first long side; 102. a second long side; 103. a first short side; 104. a second short side;

110. a raw water guide net; 120. an adhesive tape; 121. a main adhesive tape; 122. a side adhesive tape;

2. a central tube; 201. a deflector aperture; 202. a partition plate; 203. a water diversion hole; 204. a water drainage cavity;

3. pure water diversion cloth;

4. a first end cap; 401. a support part; 402. a drainage water channel; 403. a confluence chamber; 404. a mounting cavity; 405. a support table; 41. a package 42 and a mounting head;

5. a second end cap;

6. a seal;

71. a housing; 72. and (5) a shell cover.

Detailed Description

For a further understanding of the present utility model, the present utility model will be described in detail with reference to the drawings and examples.

The structures, proportions, sizes, etc. shown in the drawings are shown only in connection with the present disclosure, and are not intended to limit the scope of the utility model, since any modification, variation in proportions, or adjustment of the size, etc. of the structures, proportions, etc. should be considered as falling within the spirit and scope of the utility model, without affecting the effect or achievement of the objective. Also, the terms "upper", "lower", "left", "right", "middle", and the like are used herein for descriptive purposes only and are not intended to limit the scope of the utility model for modification or adjustment of the relative relationships thereof, as they are also considered within the scope of the utility model without substantial modification to the technical context.

Aiming at the problem of longer pure water flow passage in the water purifying filter element, more solutions are proposed in the industry, but the implementation scheme is more complicated, or the possibility of implementation exists only in the theoretical level. In this case, the cross-flow filtration membrane element of the present utility model is proposed.

Referring to fig. 1 and 2, an end face converging filter element assembly according to the present embodiment includes a central tube 2 and a membrane element, wherein the membrane element includes at least one membrane pocket 1, the membrane pocket 1 has a first long side 101 and a second long side 102 opposite to each other, and a first short side 103 and a second short side 104 opposite to each other, and the membrane pocket 1 is wound along an extending direction of the first long side 101 to form the membrane element. Wherein the central tube is placed parallel to the second short side 104, and a membrane element with the central tube can be formed by winding along the extending direction of the first long side 101. For clarity of explanation of the structure of the membrane element, the present embodiment will be described with reference to the stretched state or the wound state of the membrane element so as to clearly show the structure of the membrane element.

Referring to fig. 3, the film pouch 1 is formed by folding a film base sheet 100 along a first long side 101, dividing the film base sheet 100 into an a film sheet 100a and a B film sheet 100B, and the opposite inner side surface of the film pouch 1 is a raw water side and the outer side surface is a pure water side. Namely, the opposite side of the membrane a 100a and the membrane B100B is the raw water side, and the outer side facing away from the membrane a is the pure water side.

The wound membrane element has a multi-layered winding structure, and fig. 4 shows a membrane element structure after being unwound, and a raw water guide net 110 is provided on the raw water side to form a raw water flow passage 01 so that raw water can flow from the inner layer to the outer layer or from the outer layer to the inner layer around the circumference of the filter element. The pure water side is provided with pure water diversion cloth 3, and the pure water side forms an axial pure water flow channel 02. During filtration, water flows into the raw water side, and pure water formed through the thin base membrane 100 flows out from the first long side 101 side along the pure water flow channel 02, and the end where the first long side is located is the pure water outlet end. The concentrate remaining on the raw water side is discharged from the first short side 103 or the second short side 104 along the raw water flow path 01.

It should be noted that the thickness of the thin base film sheet 100 in this embodiment is smaller, may be smaller than 0.09mm, and is thinner and softer. Thus requiring some support. The pure water outlet end of the membrane element is provided with a first end cover 4, and the packaging part 41 of the first end cover 4 is sleeved on the periphery of the membrane element; the inner cavity of the first end cap 4 has a support portion 401 for supporting the first long side 101 of the thin base film sheet 100, and a drainage channel 402 for discharging pure water is formed on the support portion 401.

The other end of the membrane element is sleeved with a second end cover 5, the inner end surface of the second end cover 5 is at least partially sealed with the end surface of the membrane element, and the central tube 2 penetrates through the inner end surface of the second end cover and is used for discharging water flow in the central tube. The first end cap 4 and the second end cap 5 may both be made of non-metallic materials, such as plastics, by casting or compression molding, etc., or made of polymeric materials by 3D printing, etc.

Specifically, the thickness of the film sheet 100 may be 0.008 to 0.09mm, for example, 0.015mm, 0.025mm, 0.050mm, or the like. The softness can be controlled to be 2.0-40 g, so that the filter can remove wrinkles formed at the first long edge 101 during film rolling, and can normally perform filtering work.

The thickness of the existing membrane is mostly larger than 0.15mm, and the thickness is larger, if the long-side folding mode is adopted, the radial dimension of one end of the first long side of the coiled membrane element is larger, and the other end of the first long side is not folded, so that the radial dimension is smaller, and the whole membrane element presents a conical structure. When the short side is folded, the size of the film element is accumulated in the axial direction, and a plurality of folded edges can be uniformly distributed, so that the film element with relatively uniform radial size can be formed.

With reference to fig. 5, after the conventional film is folded along the long side in the manner of the present utility model, the film is further wound along the long side by the central tube, and when the film is wound, the inner side and the outer side of the film bag have different radial circumferences and have the same displacement difference, so that relatively obvious wrinkles can be formed after the film is wound. Due to the influence of softness, more sharp corners exist, dirt and scale can be accumulated during filtration of the folds and the sharp corners, and the service life of the filter element is short and even does not meet the standard.

In the present utility model, in order to eliminate or reduce wrinkles caused by such thickness and hardness, the thin-based membrane 100 used in the present embodiment has a certain limitation on the softness after thickness, so that the reverse osmosis membrane has better stretching deformation and compression deformation capability, thereby eliminating wrinkles formed at the first long side when the rolled membrane is contained, and enabling normal filtering operation. For example, the thickness is further defined as 0.01 to 0.07mm, the softness is defined as 2.0 to 20g, and of course, as other embodiments, the thickness may be further defined as 0.01 to 0.04mm, and the softness may be defined as 2.2 to 15.0g. The thin-based membrane can be a reverse osmosis membrane with corresponding thickness or a microfiltration, ultrafiltration and nanofiltration water treatment membrane, so that the cross-flow filtration of the embodiment can be realized.

The softness is tested by a softness meter, the standard measurement range is 0-100g, the weighting measurement range is 0-1000g, and the unit g is the unit in the measurement range of the meter. The softness in the utility model is the measured and displayed softness value. The measurement can be divided into a transverse softness test and a longitudinal softness, the values of which are within the scope defined by the present utility model. The softness of the conventional reverse osmosis membrane measured by the instrument is about 220-280 g. Of course, other similar softness testers may be used to perform the conversion between different units.

By way of further limitation, in other embodiments, the film-based sheet 100 has a stiffness of 2.0 to 4.2cm and the surface of the rolled film pouch 1 is a flat curved surface. The stiffness can be detected by referring to the detection mode of bending length in the national standard GB/T18318-2001.

The softer film material can reduce the effect of wrinkles, but because the material is softer, the support strength is insufficient and the film is easy to deform, the surface of the coiled film element can be approximately a flatter curved surface within a limited stiffness range, and wrinkles are reduced.

Fig. 6 is a schematic view of the rolling effect of a reverse osmosis membrane with certain softness and stiffness, wherein the long sides of different layers are misplaced, so that the folded edges of the different layers are observed to have no obvious wrinkles after rolling, and sharp angles formed by force transmission are eliminated.

The thin base membrane used may be a membrane formed of a polyolefin microporous membrane, or the like. For example, a reverse osmosis polyolefin microporous membrane is adopted, which can be formed by coating a filtering material on a thinner base membrane, and the existing membrane material processing technology can be specifically referred.

Referring to fig. 7 and 8, in order to better support the thin-based membrane 100, a confluence chamber 403 is formed between the first end cap 4 and the central tube 2, and is disposed around the central tube 2 and communicates with the drainage channel 402. During operation, the thick water which cannot be filtered inside the Bo-based membrane possibly forms certain pressure on the membrane at the first long side, then the support part can play a bearing role, the large deformation of the membrane is avoided, and meanwhile, the drainage water channel 402 and the confluence cavity 403 are utilized, so that pure water outlet is not affected.

In a specific embodiment, the mounting portion 41 of the first end cap 4 is cylindrical, and the pure water outlet end of the membrane element is mounted in the cylinder. The end face of the pure water outlet end of the membrane element is supported by a support portion 401. The drainage channels 402 are groove structures formed on the support portion 401, the groove bodies can be distributed along the radial direction, and the drainage channels 402 of the groove body structures divide the support portion into a plurality of connected or spaced blocks. The confluence chamber 403 is an annular chamber formed in the first end cap, and a plurality of drainage channels 402 are each communicated with the confluence chamber 403 to introduce pure water flowing out from the end face into the confluence chamber 403. As a modification of the confluence chamber 403, it may be intermittently disposed at the outer periphery of the center tube and engaged with the diversion hole 201.

As another embodiment of the drainage channel 402, the drainage channel 402 is a hole structure. One end of the drainage channel 402 is positioned on the surface of the supporting part 401, and the other end is led into the confluence cavity 403, so as to realize the drainage function. In other embodiments, the drainage channel may be a combination structure of a groove and a hole, mainly in drainage, and is not particularly limited.

In order to avoid the pure water from being polluted, strict sealing is needed, so that glue can be applied to the outer edge of the supporting part 401, the outer edge of the end face of the pure water outlet end is sealed, and the concentrated water or the pure water is prevented from entering the converging cavity. In the implementation, a glue groove can be formed at the outer edge of the supporting part, the glue groove is sunken relative to the surface of the supporting part, and the glue groove is filled with sealant, so that the glue solution can flow into the surface of the supporting part to influence pure water outlet.

For convenience of manufacturing, in some embodiments, the supporting portion 401 may be independent of the mounting portion 41, that is, the supporting portion 401 and the mounting portion 41 may be in a separate structure. Referring to fig. 9, in this embodiment, a support table 405 may be disposed in the inner cavity of the mounting portion 41, the support portion 401 has a plate-like structure with holes, and is mounted on the support table 405, and a region corresponding to the support table is the confluence chamber 403. Of course, the support portion 401 may be provided with a leg to form a confluence chamber region, and the connection between the support portion 403 and the mounting portion 41 may be made by a plurality of means such as a snap fit, an adhesive or a bolt connection, and is not particularly limited.

In some embodiments, the mounting portion 41 may be a boss structure in shape, with a larger outer diameter portion for mounting the membrane element and a smaller outer diameter portion for connecting the center tube. A groove may be provided on the outer wall of the mounting portion 41 to facilitate removal of the mounting portion from the membrane element. If the first end cap 4 is connected with the membrane shell and is used for supplying water or water to the outside, the first end cap 4 further comprises a mounting head 42, the inner side of the mounting head 42 is connected with the central tube 2, the outer wall is provided with a plurality of circumferential sealing grooves, and the sealing grooves can be used for mounting sealing elements to realize sealing of the end cap.

As for the central tube 2, fig. 10 shows an embodiment, the central tube 2 has a hollow structure penetrating through two ends, a pure water cavity is formed inside the central tube, one end face of the central tube is located in the converging cavity 403, and the central tube is directly communicated with the converging cavity 403 and flows back, so that pure water can be conveyed to the other end. At this time, water needs to be fed from the end face or the side face of the membrane element, and taking end face water feeding as an example, a raw water inlet is formed at one side of the second long side 102, which is close to the central tube 2, namely, a raw water inlet is formed between the second end cover 5 and the central tube; the first short side 103 is a concentrated water outlet, so that one end of the filter element is a raw water inlet end, and the other end of the filter element is a pure water outlet end. In the water inlet structure of this embodiment, as another alternative of the central tube, the side wall of the central tube 2 is provided with the diversion holes 201, and the multiple diversion holes are distributed along the axial direction, and the diversion holes 201 are correspondingly distributed in the converging cavity 403, so that the diversion holes 201 can be communicated with the converging cavity 403 and the pure water cavity. Pure water can be introduced directly to the outside of the first end cap 4 through the central tube.

In other embodiments, referring to fig. 11, a partition 202 is disposed in the hollow structure of the central tube 2, dividing the cavity in the central tube into two parts, one side of the partition 202 is a pure water cavity, the other side is a water diversion cavity 204, and a plurality of water diversion holes 203 are disposed on the side wall. The water diversion cavity 204 can be communicated with a raw water source, so that water flow is conveyed to the raw water side of the membrane element through the water diversion hole 203, and the filtered residual concentrated water can be discharged from the outer side.

In the above configuration, the filtered concentrated water may be introduced from the outer side of the membrane element into the water introduction chamber 204 of the center pipe through the water introduction hole 203, and the concentrated water may be discharged from the center pipe.

In connection with the above embodiments, in practice, a seal for sealing between the membrane element and the membrane shell is also included, which seal may be a sealing ring 6. The periphery of the membrane element is sleeved with a sealing ring, and a Y-shaped sealing ring can be adopted. The sealing ring can also be sleeved on the first end cover or the second end cover, and the sealing ring is specifically selected according to the sealing requirement.

In other embodiments, the raw water guide net 110 on the raw water side of the membrane bag 1 is substantially identical in size to the membrane bag 1 in the width direction and the length direction; in the longitudinal direction, the raw water guide net 110 can be connected to the raw water inlet for guiding raw water into the membrane bag 1. In the length direction, the raw water guide net 110 may be equal to the length of the membrane bag 1, or may be greater than the length of the membrane bag 1, so as to facilitate water inflow.

In one embodiment, a pure water guide cloth 3 may be connected to the central tube 2, and the membrane bag 1 is connected to the central tube and wound to form a membrane element. In another embodiment, the pure water guiding cloth 3 can be connected to the central tube 2, and a certain distance is formed between the membrane bag 1 and the central tube, so that a non-contact structure is formed.

In a specific winding, the film bag 1 is wound on the central tube 2 in a stretching and tensioning mode, and certain tension exists in the film bag for friction between different layers so as to avoid retraction.

On the basis of the above embodiments, the membrane element water inlet and outlet structure of the present utility model may have various specific examples. For example, on the pure water side of the membrane bag 1, the second short side 104 is connected with the central tube 2, for example, the second short side 104 is stuck on the outer wall of the central tube 2 to form a seal, and the adhesive tape 120 is stuck along the first short side 103 and the second long side 102, so that the central tube 2, the first short side 103 and the second long side 102 enclose a sealing structure, and pure water can only flow out from the first long side. Furthermore, if the sealing strip 120 at the first short side 103 is still at a distance from the edge of the film pouch, sealing at the edge needs to be achieved by means of a glue strip.

Fig. 12 shows a sealing manner of the pure water side, and adhesive tapes 120 are stuck on the first short side 103, the second short side 104 and the second long side 102 on the pure water side of the film bag 1 to form a U-shaped sealing structure. The sealing is that the adhesive tape 120 is adhered on the pure water side of the membrane bag 1, and after the winding, the adhesive tape 120 and the pure water side surface of the membrane bag 1 form a closed area which can be isolated from raw water and concentrated water. On the raw water side of the membrane bag 1, raw water can flow circumferentially after entering, and a specific water inlet and outlet mode can refer to the water inlet and outlet mode of the existing membrane element. When the water is purified, the purified water passing through the thin base film sheet 100 flows in the direction of the first long side 101 after the raw water enters, and the purified water flows out from the end face of the membrane element where the first long side 101 is located.

It should be noted that, in this embodiment, the main strip 121 of the pure water side near the second short side 104 is spaced from the second short side 104 by a distance that enables the raw water to be isolated from the pure water side in the circumferential direction. The region between the main strip 121 and the center tube 2 is sealed by a side strip 122, and the side strip 122 is located near the first long side 101, so that the end portion can be sealed with pure water. Of course, as other sealing modes, sealing can be realized by a mode of punching glue on the center ring of the end of the coiled film element instead of the side adhesive tape 122, or a combination of a plurality of sealing modes.

Correspondingly, the pure water and the concentrated water can be isolated in the same way at the concentrated water outlet, and the sealed water outlet can be sealed in a mode of sticking adhesive tapes to the film bags and gluing the outer ring of the end part.

In combination with the above embodiments, the length of the film pouch 1 in the direction of the first long side 101 is further defined in this example. At present, the conventional membrane element is generally controlled within 0.8m due to the limitation of a pure water flow channel, so that a longer flow channel is avoided. In the scheme of the utility model, the pure water flow is not influenced by the length of the membrane bag due to the adoption of the short flow channel structure. The length of the membrane element can reach 3m and more than 3m, and the flow velocity of the water flow at the raw water side can be increased by lengthening the raw water flow channel, so that the formation of sediment is avoided.

In combination with the respective structures of the membrane element and the membrane bag in the above embodiments, as other membrane element embodiments of the present utility model, at least two membrane bags 1 may be provided in the membrane element, for example, 3 or 4 membrane bags may be used, and a pure water guide cloth 3 is provided between adjacent membrane bags 1.

In addition, the two film bags 1 may be integrated, and formed by folding the film sheet 100 along the first long side 101 and then folding the film sheet along the second short side 104 twice. When 4 membrane bags 1 are provided, two membrane bags 1 adopting an integral structure are grouped into one group, and the 4 membrane bags can be divided into two groups to form one membrane element. When an odd number of membrane pockets are employed, then one of the membrane pockets may be a single membrane pocket structure.

As an embodiment of the filter cartridge, a membrane element is used, which is the membrane element in each of the above embodiments, or a membrane element in which each part is combined in different embodiments, and the filter cartridge has a membrane housing in which the membrane element is mounted. The shell can be provided with a raw water interface, a pure water interface and a concentrated water interface, and the raw water interface, the pure water interface and the concentrated water interface are connected with an external water purifier as a water path joint to form a filtering system.

Further explanation of the membrane element and filter element embodiments is presented.

Fig. 13 illustrates an embodiment of a filter cartridge.

The membrane housing has a housing 71 and a housing cover 72, the housing 71 being clamped or screwed to the housing cover 72. The first end cap is mounted to the end of the housing 71. The sealing ring 6 of the membrane element is sealed with the inner wall of the membrane shell, the membrane element is filled with water from the end where the second end cover is positioned, and filtered concentrated water flows out from the side surface of the membrane element. The central tube 2 has a partition plate so that raw water is separated from pure water. The central tube 2 is close to the pure water outlet end and is provided with a diversion hole 201, the first end cover 4 and the central tube 2 form a sealed pure water transfer cavity, and pure water flows out from a pure water interface on the membrane shell after entering the central tube.

The concentrated water flows out from the side surface, and a concentrated water flow channel and a concentrated water interface are formed at the end part of the shell, so that the concentrated water can be discharged. The shell cover is provided with a raw water interface for raw water inflow. In order to avoid mixing of concentrated water and raw water, a sealing ring 6 is arranged at a position close to the second end cover, and a Y-shaped sealing ring is adopted. Because the water inlet side pressure is greater than the concentrate side pressure, the opening of the Y-shaped sealing ring faces the second end cover, namely the water inlet side.

In order to ensure the installation effect of the sealing ring, the outer side of the membrane element can be provided with a blue adhesive tape with holes, and the Y-shaped sealing ring is installed at a position without holes to realize up-down sealing.

Fig. 14 shows another mounting of the seal ring to the second end cap. In order to avoid sliding of the Y-shaped sealing ring, a limiting step is arranged on the second end cover. In this way, no material may be wound around the membrane element.

Further, as a modification of another embodiment, with the filter element of this structure, the waterways of the raw water and the concentrate may be exchanged, i.e., the concentrate may be fed from the side of the membrane element and discharged from the center tube at the second end cap. It should be noted that, by adopting the water outlet mode, the Y-shaped sealing ring in fig. 13 can be installed reversely, that is, the opening faces the direction of the first end cover, so as to achieve a better sealing effect.

Fig. 15 illustrates a filter cartridge embodiment.

In the embodiment, water is fed from the side surface of the membrane element, concentrated water is discharged from the central part of the second end cover, a sealed space is formed between the first end cover and the central pipe, and only a pure water cavity is formed inside the central pipe to form a penetrating structure. The end of the central tube is provided with a notch which is used as a diversion hole, pure water enters the central tube from the diversion hole of the central tube of the first end cover, and flows out from the lower end of the central tube.

And reserving a part on the long edge of the membrane bag, which is not sealed, as a concentrated water outlet, namely forming a concentrated water outlet on the second end cover. The Y-shaped ring seals and separates the water inlet above and the concentrated water below. As a modification of the embodiment, the Y-shaped ring can be designed on the second end cover as well, so that the purposes of limiting and simplifying the outer ring material of the membrane element are achieved.

Fig. 16 illustrates another embodiment of the cartridge employing a central tube.

The central tube 2 is provided with a partition plate at a portion near the pure water outlet end for separating raw water inflow and pure water. And a plurality of groups of water inlet/outlet holes are arranged on the central pipe for uniform water distribution. When the membrane filter is in operation, water enters from the central tube, raw water enters into the raw water side of the membrane bag through the drainage holes on the central tube, and concentrated water flows out from the holes on the side surface of the membrane element.

In this embodiment, the raw water port is located on the housing cover 72, the concentrate port and the pure water inlet are both provided on the housing 71,

the filter element structure achieves the pure water short flow channel scheme, ensures that the membrane element of the folding scheme can have longer service life, and improves the pure water production efficiency.

The utility model and its embodiments have been described above by way of illustration and not limitation, and the utility model is illustrated in the accompanying drawings and described in the drawings in which the actual structure is not limited thereto. Therefore, if one of ordinary skill in the art is informed by this disclosure, the structural mode and the embodiments similar to the technical scheme are not creatively designed without departing from the gist of the present utility model.

Claims

1. An end face converging filter element assembly comprising a central tube and a membrane element having at least one membrane pocket having opposed first and second long sides and opposed first and second short sides, the membrane pocket being wound around the central tube in a direction along which the first long sides extend; the method is characterized in that:

2. An end face converging filter cartridge assembly according to claim 1, wherein: the stiffness of the thin base membrane is 2.0-4.2 cm, and the surface of the coiled membrane bag is a substantially flat curved surface;

3. An end face converging filter cartridge assembly according to claim 1, wherein: on the pure water side of the film pouch, a sealing structure is formed along the first short side, the second short side, and the second long side.

4. An end face converging filter cartridge assembly according to claim 1, wherein: and at the pure water outlet end of the membrane element, the outer edge of the membrane element is glued and sealed with the first end cover.

5. An end face converging filter cartridge assembly according to claim 4, wherein: a glue groove is formed in the edge of the supporting part, and the glue groove is sunken relative to the surface of the supporting part; the glue groove is filled with sealant.

6. An end face converging filter cartridge assembly according to claim 1, wherein: the first end cover is internally provided with a converging cavity which is arranged around the central tube and communicated with the drainage water channel, and pure water is discharged through the converging cavity.

7. An end face converging filter cartridge assembly according to claim 6, wherein: the central tube is provided with a hollow pure water cavity, and the side wall of the central tube is provided with a diversion hole which is communicated with the converging cavity and the pure water cavity; the pure water cavity is communicated with the end face of the central tube and is used for discharging pure water.

8. An end face converging filter cartridge assembly according to claim 7, wherein: a partition board is arranged in the central pipe, one side of the partition board is a pure water cavity, the other side of the partition board is a water diversion cavity, and the partition board is close to the pure water outlet end; the side wall of the central tube is provided with a plurality of water diversion holes communicated with the water diversion cavity in a penetrating mode, and the water diversion holes are communicated with the raw water side of the membrane bag.

9. An end face converging filter cartridge assembly according to claim 6, wherein: the supporting part and the mounting part are in an integrated structure or are arranged in a split mode, and the drainage water channel is of a groove structure or a hole structure on the supporting part.

10. An end face converging filter cartridge assembly according to claim 1, wherein: the first end cover further comprises a mounting head, the inner side of the mounting head is connected with the central tube, and the outer wall of the mounting head is provided with a circumferential sealing groove.

11. An end face converging filter cartridge assembly according to claim 1, wherein: the sealing element is sleeved on the periphery of the membrane element or the periphery of the second end cover in an annular mode.

12. An end face converging filter cartridge assembly according to claim 11, wherein: the sealing element is a Y-shaped sealing ring, and the opening of the sealing element faces to one end of raw water inflow.

13. An end face converging filter cartridge assembly according to claim 12, wherein: the sealing element is sleeved on the periphery of the second end cover in an annular mode, a step is arranged on the second end cover, and the bottom end of the sealing element abuts against the step to limit the sliding of the sealing element in the direction of the first end cover; or:

14. An end face converging filter cartridge assembly according to claim 1, wherein: the first end cover and the second end cover are both made of nonmetallic materials.

15. An end face converging filter cartridge assembly according to claim 1, wherein: and forming a seal at a first long edge of the raw water side of the membrane bag, wherein one short edge position of the first short edge or the second short edge is used as a raw water inlet, the other short edge position is used as a concentrated water outlet, or a local unsealed position of the second long edge is used as a concentrated water outlet.

16. A filter cartridge, characterized in that: a filter cartridge assembly comprising any one of claims 1-15, further comprising a membrane housing, the filter cartridge assembly being mounted within the membrane housing.

17. A filter cartridge as claimed in claim 16, wherein: the membrane shell comprises a shell body and a shell cover, and the shell body is connected with the shell cover in a clamping or threaded mode.

18. A filter cartridge as claimed in claim 17, wherein: the end part of the shell is provided with a raw water interface and a pure water interface, and a shell cover connected with the other end of the shell is provided with a concentrated water interface;

or: a concentrated water interface and a pure water interface are arranged at one end of the shell, and a raw water interface is arranged on a shell cover connected with the other end of the shell; the central tube is provided with a pure water cavity communicated with two ends, and pure water at the pure water outlet end flows out from the pure water outlet through the pure water cavity.