CN113491949A

CN113491949A - Reverse osmosis membrane element, preparation method thereof and filter element

Info

Publication number: CN113491949A
Application number: CN202010210198.1A
Authority: CN
Inventors: 桂鹏; 李杨敏; 郭玉阳; 郑跃东; 罗安泺; 玄珍雨
Original assignee: Midea Group Co Ltd; Foshan Shunde Midea Water Dispenser Manufacturing Co Ltd
Current assignee: Foshan Midea Qinghu Water Purification Equipment Co.,Ltd.; Midea Group Co Ltd
Priority date: 2020-03-21
Filing date: 2020-03-21
Publication date: 2021-10-12
Anticipated expiration: 2040-03-21
Also published as: CN113491949B; WO2021190001A1

Abstract

The invention discloses a preparation method of a reverse osmosis membrane element, the reverse osmosis membrane element and a filter element, wherein the preparation method of the reverse osmosis membrane element comprises the following steps: winding the sealing winding strip on the outer peripheral surface of the membrane element body through glue to seal and cover the outer peripheral surface of the membrane element body to obtain a semi-finished product assembly; and drying and curing the semi-finished product assembly. The technical scheme of the invention can reduce the volume of the reverse osmosis membrane element.

Description

Reverse osmosis membrane element, preparation method thereof and filter element

Technical Field

The invention relates to the technical field of water purification, and particularly relates to a reverse osmosis membrane element, a preparation method thereof and a filter element.

Background

For the traditional reverse osmosis membrane with the end face for feeding raw water and the inner side face for discharging pure water, the lateral pressure of the reverse osmosis membrane is larger because the water pressure of the raw water is larger. In order to prevent the outer side surface of the reverse osmosis membrane from expanding outwards due to overlarge raw water pressure, the outer side surface of the reverse osmosis membrane is usually spaced from a shell on which the reverse osmosis membrane is mounted, so that the volume of the whole filter element is overlarge.

Disclosure of Invention

The invention mainly aims to provide a preparation method of a reverse osmosis membrane element, aiming at reducing the volume of the reverse osmosis membrane element.

In order to achieve the purpose, the preparation method of the reverse osmosis membrane element provided by the invention comprises the following steps:

winding the sealing winding strip on the outer peripheral surface of the membrane element body through glue to seal and cover the outer peripheral surface of the membrane element body to obtain a semi-finished product assembly;

and drying and curing the semi-finished product assembly.

Optionally, the step of winding the sealing and winding strip around the outer circumferential surface of the membrane element body by glue to seal the outer circumferential surface of the membrane element body to obtain a semi-finished component comprises the following steps:

soaking the sealing winding strip in glue;

and winding the sealing winding strip soaked with the glue on the peripheral surface of the membrane element body to seal and cover the peripheral surface of the membrane element body to obtain a semi-finished product assembly.

Optionally, the preparation method of the reverse osmosis membrane element further comprises the following steps:

winding the seal winding strip on a first roller;

a second roller is arranged in the glue tank;

sleeving the membrane element body on the third roller;

the step of immersing the sealing winding strip in the glue, winding the sealing winding strip immersed in the glue around the outer circumferential surface of the membrane element body to seal the outer circumferential surface of the membrane element body, and manufacturing the semi-finished assembly comprises the following steps:

and winding the sealing winding strip around the second roller and on the outer peripheral surface of the film element body through the rotation of the first roller and the third roller to obtain a semi-finished product assembly.

Optionally, the step of winding the sealing wrap around the first roller comprises:

configuring a plurality of first rollers, wherein a sealing winding strip is wound on each first roller;

the step of winding the seal wound strip around the second roller and around the outer peripheral surface of the film element body by the rotation of the first roller and the third roller to produce a semi-finished assembly includes:

and simultaneously winding the plurality of rolls of sealing winding strips around the second roller and the film element body on the outer peripheral surface of the film element body through the rotation of the first roller and the third roller to obtain a semi-finished product assembly.

coating glue on the peripheral surface of the membrane element body;

and winding the sealing winding strip on the glue on the outer peripheral surface of the membrane element body to seal and cover the outer peripheral surface of the membrane element body to obtain a semi-finished product assembly.

sleeving a first end cover and a second end cover at two ends of the membrane element body respectively, wherein the first end cover is provided with a first sealing wall which is in sealing fit with the peripheral surface of the membrane element body, and the second end cover is provided with a second sealing wall which is in sealing fit with the peripheral surface of the membrane element body;

and winding the sealing winding strip around the part, positioned between the first sealing wall and the second sealing wall, of the outer peripheral surface of the membrane element body and the outer peripheral surfaces of the first sealing wall and the second sealing wall through glue to obtain a semi-finished product assembly.

Optionally, the step of winding the sealing winding strip around the outer circumferential surface of the membrane element body by glue to seal the outer circumferential surface of the membrane element body to obtain a semi-finished assembly includes:

winding a sealing winding strip on the outer peripheral surface of the membrane element body through glue to seal and cover the outer peripheral surface of the membrane element body;

sleeving a first end cover and a second end cover at two ends of the membrane element body respectively, wherein the first end cover is provided with a first sealing wall jointed with the sealing layer, and the second end cover is provided with a second sealing wall jointed with the sealing layer;

the winding of the sealing wrap strip by glue is continued to sealingly cover the first sealing wall and the second sealing wall.

Optionally, the sealing wrap strip is fiberglass.

The invention provides a reverse osmosis membrane element prepared by the preparation method of the reverse osmosis membrane element.

The invention also provides a filter element, which comprises a shell and a reverse osmosis membrane element;

the reverse osmosis membrane element is positioned in the shell, so that a pure water storage cavity is formed in the inner space of the shell in a partitioned mode, and the pure water storage cavity is communicated with the pure water outlet;

the shell is provided with a raw water inlet, a waste water outlet and a pure water outlet, the raw water inlet is communicated with the raw water inlet, the waste water outlet is communicated with the waste water outlet, and the pure water outlet is communicated with the pure water outlet.

According to the invention, the sealing winding strip is adopted for winding, the sealing layer formed by the sealing winding strip and the glue is extremely strong in hardness, and the glue can fill the gap between the sealing winding strips, so that the outer side surface of the membrane element body can be prevented from being expanded by the pressure difference between the raw water and the pure water, and an innovative reverse osmosis membrane element is formed.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a schematic flow diagram of a method of preparing a reverse osmosis membrane element of the present invention;

FIG. 2 is a detailed flowchart of step S10 in FIG. 1;

FIG. 3 is a detailed flowchart of steps S11 and S12 in FIG. 2;

FIG. 4 is a detailed flowchart of steps S31 and S34 in FIG. 3;

FIG. 5 is a schematic view of another detailed flow chart of step S10 in FIG. 1;

FIG. 6 is a schematic view of a further detailed flow chart of step S10 in FIG. 1;

FIG. 7 is a schematic view of a further detailed process of step S10 in FIG. 1;

FIG. 8 is a schematic sectional view of one embodiment of a filter cartridge of the present invention;

FIG. 9 is a schematic view of a water path of the filter element shown in FIG. 8 after the pressure at the raw water end is cut off;

FIG. 10A is a front view of the first endcap of FIG. 8;

FIG. 10B is a bottom view of the first endcap of FIG. 10A;

FIG. 11A is a bottom view of the third endcap of FIG. 8;

FIG. 11B is a front view of the third endcap of FIG. 11A;

FIG. 11C is a top view of the third endcap of FIG. 11A;

fig. 12 is a schematic sectional view of another embodiment of a cartridge of the present invention;

FIG. 13A is a schematic structural view of the first endcap of FIG. 12;

FIG. 13B is a schematic view of the first endcap of FIG. 12 from another perspective;

FIG. 14A is a schematic structural view of the second endcap of FIG. 12;

FIG. 14B is a schematic view of the second endcap of FIG. 12 from another perspective;

FIG. 15A is a schematic structural view of the third endcap of FIG. 12;

FIG. 15B is a schematic view of the third endcap of FIG. 12 from another perspective;

FIG. 16A is a schematic structural view of the fifth endcap of FIG. 12;

FIG. 16B is a schematic view of the fifth endcap of FIG. 12 from another angle;

fig. 17 is a schematic sectional view of a further embodiment of a cartridge according to the invention;

FIG. 18 is an enlarged schematic view at A of FIG. 17;

FIG. 19 is a schematic view of a process for manufacturing a reverse osmosis membrane element of the present invention;

fig. 20 is a graph of the effect of a single-core initial cup of water compared with a test.

The reference numbers illustrate:

the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.

In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" appearing throughout is to include three juxtapositions, exemplified by "A and/or B," including either the A or B arrangement, or both A and B satisfied arrangement. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

The invention provides a preparation method of a reverse osmosis membrane element, please refer to fig. 1 in combination, and the preparation method comprises the following steps:

and step S10, winding the sealing winding strip on the outer peripheral surface of the membrane element body through glue to seal the outer peripheral surface of the membrane element body, so as to obtain a semi-finished product assembly.

In an embodiment of the present invention, referring to fig. 8, the reverse osmosis membrane element includes a membrane element body 10. The membrane element body 10 is wound in a cylindrical shape.

In the step of winding the sealing winding strip 31 around the outer circumferential surface of the membrane element body 10 by glue, the sealing winding strip 31 may be soaked in the glue in advance, so that the surface of the sealing winding strip 31 is stained with the glue; alternatively, glue may be applied to the outer peripheral surface of the membrane element body 10 in advance; alternatively, glue may be applied to the sealing wrap strip 31.

The seal winding strip 31 refers to a strip-like structure which may be a circular strip or a strip of a flat structure, and the length of the seal winding strip 31 is long to enable multiple winding on the outer side surface of the membrane element body 10. For example, the seal wrap strip 31 may be fiberglass or wire, wherein the wire may be stainless steel wire. The seal-wound strip 31 is provided to closely wrap the membrane element body 10 one turn around along the circumferential direction of the membrane element body 10, thereby covering the entire or at least a part of the outer circumferential surface of the membrane element body 10.

The sealing winding strip 31 is wound on the outer side surface of the membrane element body 10, which means that the sealing winding strip 31 is tightly attached to the outer side surface of the membrane element body 10, so that water is prevented from flowing out of the outer side surface of the membrane element body 10, the size of a finally formed product is smaller, and the space occupation of the whole device is reduced.

The sealing wrap strip 31 may wrap the entire outer side surface of the membrane element body 10, or the sealing wrap strip 31 may wrap only a part of the outer side surface of the membrane element body 10, alternatively, the sealing wrap strip 31 may wrap the middle area of the outer side surface of the membrane element body 10, and both end areas of the outer side surface of the membrane element body 10 may be sealed by other sealing structures, so that the outer side surface of the membrane element body 10 can be effectively prevented from swelling.

In order to make the tightness of the seal winding strip 31 better, the seal winding strip 31 may be wound in a plurality of layers on the outer side surface of the membrane element body 10, and each layer wraps the outer side surface of the membrane element body 10 or the previous layer of the seal winding strip 31 inside.

Adopt sealed winding strip 31 to carry out the form of winding, sealed winding strip 31 and glue jointly form the sealing layer hardness extremely strong, glue can fill the gap between the sealed winding strip simultaneously, so can prevent that the pressure differential (for domestic membrane element, this pressure differential is 6 ~ 12 kilograms usually) between raw water and pure water from expanding membrane element body 10 lateral surface to form an innovative reverse osmosis membrane element.

The inner side surface of the membrane element body 10 is provided with a pure water outlet, and the end surface of the membrane element body 10 is provided with a raw water inlet 11 and a waste water outlet 12. The raw water inlet 11 and the waste water inlet may be disposed on the same end surface, and in other embodiments, the raw water inlet 11 and the waste water inlet may be disposed on two end surfaces.

The membrane element body 10 is substantially hollow and cylindrical, and the reverse osmosis membrane element may further include a central tube 20, and the central tube 20 is installed in the hollow area of the membrane element body 10, that is, the membrane element body 10 is wound around the central tube 20 to be cylindrical. The membrane element body 10 is wound with a roll membrane centered on a center tube 20, and the center tube 20 provides a central support structure for the membrane element body 10.

In one embodiment, the central tube 20 has a plurality of through holes 23 formed in a peripheral wall thereof for communicating with the pure water outlet, wherein at least one end of the central tube 20 is penetrated to discharge the pure water. In this embodiment, the membrane element body 10 is wound around the central tube 20, and the two are bonded to each other.

In one embodiment, both ends of the central tube 20 are penetrated, one end of the central tube 20 is communicated with the pure water outlet of the membrane element body 10, and the other end of the central tube 20 is used for discharging pure water. In this embodiment, the membrane element body 10 may be directly wound around the central tube 20, or the membrane element body 10 may be spaced apart from the central tube 20.

Specifically, raw water enters the membrane element body 10 from the raw water inlet 11 on the end face of the membrane element body 10, and after being filtered by the membrane element body 10, pure water flows into the central tube 20 from the inner side face, i.e., the inner side face, of the membrane element body 10, for example, through the through hole 23 in the central tube 20, and finally flows out from the end of the central tube 20. Meanwhile, the wastewater flows out from the wastewater outlet 12 on the end face of the membrane element body 10.

The glue can be epoxy glue or food-grade AB glue, and the main component is polyurethane. In addition, the compatibility of the glass fiber and the resin is good, so that the adhesion of glue can be increased, and the tightness between the sealing winding strip 31 and the membrane element body 10 is improved.

Referring to fig. 1 again, in an embodiment of the present invention, the method for preparing a reverse osmosis membrane element further includes the following steps:

and step S20, drying and curing the semi-finished product assembly.

In the above, the sealing winding strip 31 is wound around the outer peripheral surface of the membrane element body 10 through the glue, and the whole outer peripheral surface of the membrane element body 10 is wrapped by the glue, so that the semi-finished assembly is dried and cured, the glue state can be rapidly stabilized, and water leakage on the outer peripheral surface of the membrane element body 10 is avoided.

The following two embodiments specifically describe two ways of combining glue and sealing wrap strip, but are not limited thereto:

referring to fig. 2, in an embodiment, the bonding between the glue and the sealing tape is realized by soaking. Specifically, in step S10, the step of winding the sealing winding strip around the outer circumferential surface of the membrane element body by glue to seal the outer circumferential surface of the membrane element body, and the step of manufacturing the semi-finished assembly includes the following steps:

step S11, soaking the sealing winding strip in glue;

and step S12, winding the sealing winding strip soaked with the glue on the outer peripheral surface of the membrane element body to seal and cover the outer peripheral surface of the membrane element body, so as to obtain a semi-finished product assembly.

The adoption will seal the form that winding strip 31 soaks in the glue, can ensure that every department of seal winding strip 31 all is stained with glue to make between the two adjacent circles of seal winding strip 31, and all be attached to glue between seal winding strip 31 and the film element body 10 outer peripheral face, improve the sealed effect of seal winding strip 31 greatly.

In step S11, the sealing strip 31 may be soaked in the glue, and the whole roll of sealing strip 31 may be soaked in the glue all the time, and then one end of the sealing strip 31 is led out and wound around the membrane element body 10. Or, the whole roll of sealing winding strip 31 is positioned outside the glue tank, and then one end of the sealing winding strip 31 is introduced into the glue tank to be stained with glue, and then wound to the membrane element body 10.

Referring to fig. 3 and 19 in combination, for example, in an embodiment, the method for preparing the reverse osmosis membrane element further includes the following steps:

step S31, winding the seal wound strip around the first roller;

step S32, arranging a second roller in the glue tank;

step S33, sleeving the membrane element body on a third roller;

and step S34, winding the seal wound strip around the second roller around the outer peripheral surface of the film element body by rotation of the first roller and the third roller, to obtain a semi-finished assembly.

In this embodiment, the first roller 97 is rotatable, and after the seal winding strip 31 is wound on the first roller 97, the seal winding strip 31 can gradually reduce the number of windings on the first roller 97 by the rotation of the first roller 97.

Since the seal wrap strip 31 is stained with glue by passing around the second roller 98, the second roller 98 is at least partially positioned below the glue plane line in the glue tank 100. For example, the second roller 98 may be arranged laterally with its outer circumferential surface partially in contact with glue.

The second roller 98 is rotatable, so that the friction between the seal wrap strip 31 and the second roller 98 can be reduced when the seal wrap strip 31 is pulled to be wound onto the film element body 10. Of course, the second roller 98 may not rotate.

The third roller 99 can pass through a hollow area (i.e., a mounting hole for mounting a center pipe) of the membrane element body 10; it is also possible to provide one third roller 99 at each end of the film element body 10 and insert the third roller 99 partially into the mounting hole.

The third roller 99 is also rotatable, and the third roller 99 drives the film element body 10 to rotate together and pulls the sealing winding strip 31, so that the sealing winding strip 31 is continuously wound on the film element body, and in the process, the sealing winding strip 31 contacts with the glue in the glue groove 100 and carries the glue when passing through the second roller 98.

Referring to fig. 4, in one embodiment, the step of winding the sealing wrap around the first roller includes:

step S311, configuring a plurality of first rollers, wherein each first roller is wound with a sealing winding strip;

and step S341, simultaneously winding the plurality of rolls of sealing winding strips around the second roller and on the outer peripheral surface of the film element body through the rotation of the first roller and the third roller to obtain a semi-finished product assembly.

In the step S311, the rotation directions of the plurality of first rollers 97 are the same, for example, the plurality of first rollers 97 may be arranged side by side.

In step S341, a plurality of rolls of sealing strips 31 are adopted and simultaneously wound on the membrane element body 10, and the plurality of rolls of sealing strips 31 are sequentially laid on the membrane element body 10, so that the winding time of the membrane element body 10 can be greatly saved.

Referring to fig. 5, in an embodiment, the bonding of the glue to the sealing wrap strip is achieved by way of painting. Specifically, in step S10, the step of winding the sealing winding strip around the outer circumferential surface of the membrane element body by glue to seal the outer circumferential surface of the membrane element body, and the step of manufacturing the semi-finished assembly includes the following steps:

step S13, coating glue on the peripheral surface of the membrane element body;

and step S14, winding the sealing winding strip on the glue on the outer peripheral surface of the membrane element body to seal the outer peripheral surface of the membrane element body, so as to obtain a semi-finished product assembly.

In this embodiment, glue is first applied to the outer peripheral surface of the membrane element body 10, and then the sealing wrap strip 31 is wound around the glue on the outer peripheral surface of the membrane element body 10, so that the sealing wrap strip, the glue and the outer peripheral surface of the membrane element body are tightly combined.

In order to improve the tightness, the outer side surface of the membrane element body 10 is wound with a plurality of layers of the sealing winding strips 31, and glue can be applied between two adjacent layers of the sealing winding strips 31, that is, after each layer of the sealing winding strips 31 is wound, one layer of glue can be applied to the outer side surface of the membrane element body, and then the next layer of the sealing winding strips 31 is wound. Of course, the thickness of the glue applied on the outer peripheral surface of the membrane element body 10 may be thicker, and the excess glue may overflow to contact with the next layer of sealing wrap strip 31 during the process of winding the sealing wrap strip 31.

The glue bonds the two adjacent layers of sealing winding strips 31 together, thereby improving the binding force of the sealing winding strips 31 on the membrane element body 10. Meanwhile, two adjacent circles of sealing winding strips 31 on the same layer are tightly bonded together through glue, so that the two adjacent circles of sealing winding strips 31 can be prevented from being scattered. After the glue is adopted, the sealing layer formed by the sealing winding strip 31 has extremely strong hardness.

Referring to fig. 8 again, in an embodiment, a first end cap 40 is disposed at one end of the membrane element body 10, and a second end cap 40 is disposed at the other end of the membrane element body 10, so that after the first end cap 40 and the second end cap 50 are adopted, the strength of the membrane element body 10 near the end portion is improved better, and the stability is higher.

Referring to fig. 6, after the first end cap and the second end cap are adopted, in an embodiment, the step S10 of winding the sealing winding strip around the outer circumferential surface of the membrane element body through glue to seal the outer circumferential surface of the membrane element body, so as to obtain the semi-finished component, includes the following steps:

step S15, respectively sleeving a first end cover and a second end cover at two ends of a membrane element body, wherein the first end cover is provided with a first sealing wall which is in sealing fit with the peripheral surface of the membrane element body, and the second end cover is provided with a second sealing wall which is in sealing fit with the peripheral surface of the membrane element body;

and step S16, winding the sealing and winding strip around the part between the first sealing wall and the second sealing wall on the outer peripheral surface of the membrane element body and the outer peripheral surfaces of the first sealing wall and the second sealing wall through glue to obtain a semi-finished product assembly.

In this embodiment, the first end cap and the second end cap may be respectively sleeved at two ends of the membrane element body, and the first end cap and the membrane element body, and the second end cap and the membrane element body may be sealed and bonded by glue. And then winding a sealing winding strip on the outer peripheral surface of the membrane element body at a part between the first sealing wall and the second sealing wall and the outer peripheral surfaces of the first sealing wall and the second sealing wall, so that the sealing winding strip, the first sealing wall and the second sealing wall jointly seal and wrap the outer peripheral surface of the membrane element body.

Referring to fig. 7, in an embodiment, in the step S10, the step of winding the sealing winding strip around the outer circumferential surface of the membrane element body by glue to seal the outer circumferential surface of the membrane element body, so as to obtain the semi-finished component includes the following steps:

step S17, winding the sealing and winding strip on the outer peripheral surface of the membrane element body through glue to seal and cover the outer peripheral surface of the membrane element body;

step S18, respectively sleeving a first end cover and a second end cover at two ends of a membrane element body, wherein the first end cover is provided with a first sealing wall jointed with a sealing layer, and the second end cover is provided with a second sealing wall jointed with the sealing layer;

step S19, the sealing wrap strip is continuously wound by glue to sealingly cover the first sealing wall and the second sealing wall.

In this embodiment, the sealing wrap strips are wound around the outer peripheral surface of the membrane element body, thereby sealing and wrapping the entire outer peripheral surface of the membrane element body. Then after first end cover and second end cover were established to the cover, can play the fixed action to sealed winding strip, prevent that sealed winding strip from removing. And then, the sealing winding strip is continuously wound, so that the first end cover and the second end cover can be fastened, and meanwhile, the sealing performance of the peripheral surface of the membrane element body can be further ensured.

In step S19, the seal-wound strip may be wound from one end to the other end of the membrane element body such that the entire outer circumferential surface is wound with the seal-wound strip, thereby forming a multilayer seal layer together with the seal-wound strip wound in step S17.

The invention also provides a reverse osmosis membrane element prepared by the preparation method of the reverse osmosis membrane element.

Referring to fig. 8, 10A and 10B, the reverse osmosis membrane element further includes a first end cap 40 and a second end cap 50, the first end cap 40 and the second end cap 50 are respectively disposed at two ends of the membrane element body 10, the first end cap 40 has a first sealing wall 41 disposed around an outer side surface of the membrane element body 10, and the second end cap 50 has a second sealing wall 51 disposed around an outer side surface of the membrane element body 10.

The first seal wall 41 and the second seal wall 51 are each annular and tightly wrapped around the outer side surface of the membrane element body 10.

The first sealing wall 41, the second sealing wall 51 and the sealing wrap strip 31 together seal-wrap the outer side of the membrane element body 10. Optionally, the first sealing wall 41 and the second sealing wall 51 are both disposed between two adjacent layers of the sealing wrap strip 31. Specifically, one or more layers of the sealing wrap strips 31 are wound on the outer side surface of the membrane element body 10, after a certain period of winding, the first end cap 40 and the second end cap 50 are then mounted to both ends of the membrane element body 10, and then the sealing wrap strips 31 are wound continuously until the first sealing wall 41 of the first end cap 40 and the second sealing wall 51 of the second end cap 50 are completely wound and sealed by the sealing wrap strips 31.

The first sealing wall 41 and the second sealing wall 51 are arranged between two adjacent layers of the sealing winding strips 31, so that on one hand, the sealing performance between the first sealing wall 41 and the sealing winding strips 31 and the sealing performance between the second sealing wall 51 and the sealing winding strips 31 can be improved, and the bursting outside the membrane element body 10 is avoided; on the other hand, the mounting reliability of the first end cap 40 and the membrane element body 10, and the mounting reliability of the second end cap 50 and the membrane element body 10 can be improved.

Further, in other embodiments, the first seal wall 41 and the second seal wall 51 may be provided between the seal wrap strip 31 and the membrane element body.

The reverse osmosis membrane element has a first end face 13 and a second end face 14 opposite to the first end face 13, the first end face 13 is located at one end of the first end cover 40, and the second end face 14 is located at one end of the second end cover 50.

Please refer to fig. 13A and 13B in combination with fig. 14A and 14B, wherein the structure of the first end cap 40 shown in fig. 13A and 13B is slightly different from the structure of the first end cap 40 shown in fig. 10A and 10B. The structure of the second end cap 50 shown in fig. 14A and 14B is also slightly different from that of the second end cap 50 in fig. 8.

In order to improve the adhesive force of the glue, the first sealing wall 41 may be opened with a first glue accommodating hole 411, and the sealing winding strip 31 is wound around the first glue accommodating hole 411 in a sealing manner; and/or the second sealing wall 51 may be provided with a second glue accommodating hole 511, and the sealing winding strip 31 is wound around the second glue accommodating hole 511 in a sealing manner.

Specifically, the first glue receiving holes 411 may be opened in a plurality, and the plurality of first glue receiving holes 411 are arranged at intervals along the circumferential direction of the first sealing wall 41. The shape of the first glue hole 411 may be a long bar, a square, a triangle, a circle, etc., for example, the long bar first glue hole 411 extends along the axial direction of the first end cap 40.

Similarly, a plurality of second glue receiving holes 511 may be formed, and the plurality of second glue receiving holes 511 are arranged at intervals along the circumferential direction of the second sealing wall 51. The second glue hole 511 may be a long bar, a square, a triangle, a circle, etc., for example, the long bar second glue hole 511 extends along the axial direction of the second end cap 50.

The sealing winding strip 31 is wound around the first glue containing hole 411 and the second glue containing hole 511 in a sealing manner, that is, the sealing winding strip 31 covers the first glue containing hole 411 and the second glue containing hole 511 in a sealing manner, and for the first glue containing hole 411 and the second glue containing hole 511 which are annular and blind holes, the sealing winding strip can be accommodated in the first glue containing hole 411 and the second glue containing hole 511.

Through setting up first appearance gluey hole 411 and second appearance gluey hole 511, unnecessary glue can hold in first appearance gluey hole 411 and second appearance gluey hole 511, improves the accommodation space of glue to promote the bonding effect.

The first end cover 40 may further include a limiting ring groove 431, the limiting ring groove 431 extends along the circumferential direction of the first sealing wall, and the sealing winding strip 31 is wound in the limiting ring groove 431. The plurality of limiting ring grooves 431 may be provided, and the plurality of limiting ring grooves 431 are arranged at intervals along the axial direction of the first end cover 40. The arrangement of the limiting ring groove 431 enables at least one circle or a plurality of circles of sealing winding strips to be embedded into the limiting ring groove 431, so that the sealing winding strips can be limited, and the sealing winding strips are prevented from moving in the axial direction of the first end cover.

In one embodiment, the first end cap 40 further has a connecting wall 43 and a limiting wall 42, the limiting wall 42 faces the end face of the membrane element body, and the connecting wall 43 and the first sealing wall are respectively connected with the limiting wall 42 and extend in opposite directions, that is, the connecting wall 43 and the first sealing wall are respectively arranged at two opposite sides of the limiting wall 42 and are arranged along the axial direction of the first end cap, so that the connecting wall 43 protrudes outside the membrane element body in a direction away from the membrane element body.

The limiting wall 42 may directly abut against the end face of the membrane element body 10, or the limiting wall 42 may abut against the third end cap 60, so that the first end cap 40 is limited from moving in the direction of the second end cap 50.

The first sealing wall 41 is connected to the edge of the stopper wall 42, and the cross-sections of the two form an L-shaped structure. Alternatively, the connection position of the first sealing wall and the limiting wall 42 is spaced from the edge of the limiting wall 42, and the cross sections of the first sealing wall and the limiting wall form a T-shaped structure.

The connecting wall 43 may be connected to an edge of the stopper wall 42, and the cross-sections of the two form an L-shaped structure. Alternatively, the connecting position of the connecting wall 43 and the limiting wall 42 is spaced from the edge of the limiting wall 42, and the cross sections of the connecting wall and the limiting wall form a T-shaped structure.

In one embodiment, the connecting wall 43 is provided with the limiting ring groove 431. In this way, the first end cap 40 can receive the pulling force of the sealing winding strip towards the second end cap 50 under the action of the sealing winding strip, so that the first end cap 40 is better fixed with the membrane element body, and the first end cap 40 is prevented from moving.

The raw water inlet 11 and the waste water outlet 12 can be disposed near the first end surface 13, and communication ports are formed on the first end cover 40, i.e., the limit wall 4242, and respectively communicate with the raw water inlet 11, the pure water outlet, and the waste water outlet 12.

A second end cover 50 is arranged at one end of the membrane element body 10, the second end cover 50 is provided with a third sealing wall 52, and the third sealing wall 52 is hermetically bonded with the end face of the membrane element body 10 through sealant. In this embodiment, the third seal wall 52 faces the end face of the membrane element body 10, and the second seal wall 51 is connected to the third seal wall 52.

The third sealing wall 52 is provided with a support rib, and the support rib abuts against the end face of the membrane element body 10. Optionally, the number of the support ribs is multiple, and the support ribs are arranged at intervals along the circumferential direction of the second end cover 50. In order to achieve better supporting effect, in an embodiment, the plurality of supporting ribs include a first supporting rib 521 and a second supporting rib 522, and the number of the first supporting ribs 521 is multiple and is arranged at intervals along the circumferential direction of the second end cover 50. The second support rib 522 may have an annular shape, and the annular second support rib 522 also extends along the circumferential direction of the second end cap 50. In this way, the distribution of the contact force between the membrane element body 10 and the third seal wall 52 is more uniform.

The support rib is provided so that a gap is provided between the third sealing wall 52 and the end face of the membrane element body 10, and the gap can accommodate more sealant, thereby improving the connecting effect between the third sealing wall 52 and the end face of the membrane element body 10.

In addition, a stopper 53 may be provided on the second end cap 50 to be inserted into the center tube 20 to restrict the movement of the center tube 20. In order to realize the outflow of pure water from the side where the second end cap 50 is located, the through hole 23 may be opened on the stopper column 53.

Referring to fig. 12, fig. 15A and fig. 15B, the reverse osmosis membrane element may further include a third end cap 60, the third end cap 60 and the first end cap 40 are disposed at the same end of the membrane element body 10, and the third end cap 60 is located between the first end cap 40 and the end face of the membrane element body 10. The third end cap 60 and the first end cap 40 may collectively form a plurality of communication ports therebetween.

For example, a communication port for allowing raw water to enter the raw water inlet 11 of the membrane element body 10 is formed between the outside of the third end cap 60 and the inside of the first seal wall 41 in common. A communication port is formed on the third end cap 60 and near the central tube 20, and the communication port is used for flowing out waste water.

In addition, a central region of the third end cap 60 may be provided with a through hole for passing the center tube 20 therethrough, and at the same time, for installing the fifth end cap 96.

Referring to fig. 12, 16A and 16B, the reverse osmosis membrane element may further include a fifth end cap 96, the fifth end cap 96 and the first end cap 40 are disposed at the same end of the membrane element body 10, and the fifth end cap 96 is disposed at the inner side of the third end cap 60. A plurality of communication ports may be formed between the third end cap 60 and the fifth end cap 96. Wherein a structure for positioning the center tube 20, for example, a positioning column 61 may be formed on the fifth end cap 96. The third end cap 60 is disposed between the first end cap 40 and the fifth end cap 96.

The present invention further provides a filter element, which includes a housing 70 and a reverse osmosis membrane element, wherein the specific structure of the reverse osmosis membrane element is described in the above embodiments, and is not described herein again.

Referring again to fig. 1 in combination, the housing 70 has a mounting chamber, a pure water storage chamber 73, a raw water inlet 74, a waste water outlet 75 and a pure water outlet 76, the raw water inlet 74 is communicated with the raw water inlet 11, the waste water outlet 75 is communicated with the waste water outlet 12, the pure water outlet 76 is communicated with the pure water outlet, and the pure water storage chamber 73 is communicated with the pure water outlet; the reverse osmosis membrane element is located in the installation cavity.

The housing 70 is generally cylindrical and the housing 70 and the reverse osmosis membrane element are disposed generally coaxially therebetween. The housing 70 includes a cylinder 71 and a fourth end cover 72, one end of the cylinder 71 is closed, the other end is open, and the fourth end cover 72 covers the opening of the cylinder 71. The fourth end cover 72 is provided with a raw water inlet 74, a waste water outlet 75, and a pure water outlet 76. The communication ports formed in the first and

third caps

40 and 60 sequentially communicate the raw water inlet 74 with the raw water inlet 11, the wastewater discharge port 75 with the wastewater outlet 12, and the pure water discharge port 76 with the pure water outlet.

The space inside the housing 70 other than the installation cavity may constitute the pure water storage chamber 73, that is, the reverse osmosis membrane element is disposed inside the housing, and the pure water storage chamber 73 is partitioned from the space inside the housing 70. For example, the pure water storage chamber 73 may be located at an end portion of the housing 70, or the pure water storage chamber 73 may be located on the peripheral side of the housing 70. At least, the pure water storage chamber 73 is located outside the reverse osmosis membrane element, and pure water flows out from the end of the center tube 20 and then flows into the pure water storage chamber 73.

To traditional filter core, after raw water end pressure disconnection, inevitably have the unable discharge of partial waste water in the filter core, because the decline of raw water pressure, this partial waste water can permeate towards the pure water side gradually, leads to shutting down the TDS value in the pure water of reserving after higher. When the water purifier is restarted, the pure water discharged by the filter element firstly, namely the first cup of water, is mostly the pure water remained after the previous shutdown. Conceivably, the TDS value of the first cup of water was very high.

In contrast, in the filter element, part of pure water is stored in the pure water storage cavity 73 all the time, and the pure water storage cavity 73 is arranged, so that the amount of the pure water reserved in the whole filter element is greatly increased after the water purifier is shut down. Therefore, even if the wastewater permeates toward the pure water side after the shutdown, the wastewater permeated into the pure water side is diluted by a large amount of pure water after being mixed with a large amount of pure water, so that the amount of harmful substances contained in the pure water per unit volume is greatly reduced, namely, the TDS value of the retained pure water is low. After being powered on again, this portion of the pure water stored in the pure water storage chamber 73 flows to the pure water discharge port 76 and is mixed with the newly prepared pure water, so that the concentration of the first cup of water (referred to as the first 8 cups of water, which define 200ml per cup of water) is diluted, thereby greatly reducing the TDS value of the first cup of water.

In addition, because the membrane element body 10 in the filter core, its whole lateral surface all is sealed by sealed wrapping 31, and sealed wrapping 31 can guarantee that whole reverse osmosis membrane element has sufficient intensity and guarantees the leakproofness, makes pure waste water not to cross water, can prevent simultaneously that the pressure differential (6 ~ 12 kilograms) between raw water and pure water to the setting of pure water storage chamber 73 has been realized. The solution of embodiments of the invention can achieve a reduction in TDS value for the first cup of water without the need for additional equipment, as compared to conventional systems that additionally provide a water tank to back flush the membrane element body 10.

In one embodiment, the pure water storage chamber 73 includes an end storage chamber 731, and the end storage chamber 731 is located between the second end face 14 and the wall surface of the housing 70. In this embodiment, the center tube 20 is inserted into the end storage chamber 731, or the end of the center tube 20 is butted against the end storage chamber 731.

The configuration of the end storage chamber 731 can be varied, and referring to fig. 8 and 9 in combination, in one embodiment, the second end surface 14 is spaced from the wall of the housing 70, which defines the end storage chamber 731. In this embodiment, the wall surface of the housing 70 refers to a surface facing the second end face 14. To achieve the spacing between the second end face 14 and the wall surface of the housing 70, the second end cover 50 may be provided with a support protrusion 54, and the support protrusion 54 abuts against the surface of the housing 70 facing the second end face 14. Of course, the surface of the housing 70 facing the second end face 14 may also be provided with a mounting projection which abuts against the second end face 14. Alternatively, as shown in FIG. 14A, the second end cap 50 can have a drainage channel 55, wherein the drainage channel 55 can contain pure water. In addition, in embodiments where the annular storage chamber 732 is provided, the drainage grooves 55 can also drain pure water to the annular storage chamber 732.

Alternatively, referring to fig. 12, in an embodiment, a wall surface of the housing 70 facing the second end surface 14 is provided with a groove, and the groove forms the end storage cavity 731. In this embodiment, the second end surface 14 can contact a wall surface of the housing 70 facing the second end surface 14, and the end storage cavity 731 is a groove formed in the wall surface. Alternatively, the second end face 14 may be spaced from the wall surface of the housing 70 facing the second end face 14, the spacing and the grooves together constituting the end storage chamber 731.

In order to further increase the volume of the pure water storage chamber 73, in one embodiment, the pure water storage chamber 73 further includes an annular storage chamber 732, the annular storage chamber 732 communicates with the end storage chamber 731, and an annular gap is provided between the outer side surface of the membrane element body 10 and the wall surface of the housing 70, and the annular gap constitutes the annular storage chamber 732. So, because the filter core outer lane is the pure water, so can make full use of filter core space, the promotion of single core membrane component performance is realized to maximize membrane area. At the same time, the arrangement of the annular storage chamber 732 and the end storage chamber 731 is such that the entire reverse osmosis membrane element is substantially immersed in pure water, which has an enhancing effect on the life of the reverse osmosis membrane. In addition, the annular storage cavity 732 and the end storage cavity 731 jointly store pure water, so that the water volume of the pure water is greatly increased, and the dilution of the first cup of water is effectively reduced.

In addition, it should be noted that, in the industrial membrane, because the application scene pressure is too high (the maximum pressure of the seawater membrane is 80 kg), if the external side surface of the membrane element body 10 is sealed, the process end surface is filled with water to prevent the membrane element from bursting, and the pressure exists as a shear pressure. On the household membrane, pure water is arranged outside the reverse osmosis membrane element due to different water inflow and water discharge, wastewater is arranged on the surface of the membrane, the force is a vertical force, and the process is adopted to prevent water cross caused by a large pressure difference (about 0-12 kilograms expected) between the pure water and the raw water.

There are various types of water paths for pure water, and the following embodiments are not limited thereto:

referring to fig. 8, 9 and 12, in an embodiment, two ends of the central tube 20 are through, the pure water outlet 76 is disposed near the first end surface 13, one end of the central tube 20 near the first end surface 13 is communicated with the pure water outlet 76, and one end of the central tube 20 near the second end surface 14 is communicated with the pure water storage chamber 73.

Taking the pure water storage chamber 73 as an example, which has both the end storage chamber 731 and the annular storage chamber 732, in this embodiment, the end of the annular storage chamber 732 near the second end surface 14 is open and is communicated with the end storage chamber 731, and the end of the annular storage chamber 732 near the first end surface 13 is closed, so that the pure water storage chamber 73 is ensured to have only a communication port with the central tube 20, the pure water can be prevented from flowing away from the end near the first end surface 13, and the water storage function of the pure water storage chamber 73 is ensured.

Wherein the first sealing wall 41 of the first end cap 40 may sealingly abut the inner wall of the housing 70, thereby achieving closure of the annular storage chamber 732 at an end thereof adjacent the first end face 13. Alternatively, a sealing rib may be provided on the first sealing wall 41 or on the inner wall of the housing 70, so that the annular storage chamber 732 is closed at its end close to the first end face 13.

Taking the example in which the pure water storage chamber 73 has the end storage chamber 731, in this embodiment, the outside of the end storage chamber 731, which is the side close to the inside surface of the housing 70, is sealed, thereby ensuring that the pure water storage chamber 73 has only a communication port with the center pipe 20 and preventing pure water from flowing out from other places.

Specifically, when the filter is turned on, pure water flows into the center tube 20, and most of the pure water flows from the end of the center tube 20 near the first end surface 13 to the pure water discharge port 76 of the housing 70 and is discharged to the outside of the filter element for use by a user. The remaining small portion of the pure water flows from the end of the central tube 20 near the second end face 14 to the end storage chamber 731 and the annular storage chamber 732, and during this process, the pure water can compress the gas in the pure water storage chamber 73.

Referring to fig. 9, after the raw water stops being fed, the pure water outlet 76 is closed, the pressure at the raw water end is cut off, and the pure water in the pure water storage chamber 73 can reversely flush the membrane element body 10 under the reverse pressure of the compressed gas, so that the wastewater is squeezed out from the wastewater outlet 75, and thus the amount of wastewater in the filter element can be reduced, thereby further reducing the exchange amount of wastewater, and enabling the concentration inside the filter element to be balanced as soon as possible. Meanwhile, the pure water remaining after the membrane element body 10 is backwashed in the pure water storage chamber 73 can also dilute the initial cup of water. Thereby further improving the effect of the first cup of water and realizing the real fresh water of the large flux water.

If 400ml of pure water is added to the whole filter element (the inner diameter of the housing 70 is 92mm, the outer diameter of the reverse osmosis membrane element is 79mm, the height h of the reverse osmosis membrane element is 230mm, v ═ S × h ═ pi (46 × 46-39.5 × 39.5) × 230 equals about 400ml, according to experience, about 650ml of filter element wastewater is extracted, the TDS value of the first cup of water is about 80 (the TDS value of raw water is 100) without being connected, if pure water is exchanged with raw water (the pure water in the central tube 20 is ignored), the method is equivalent to adding pure water into an RO membrane (reverse osmosis membrane) (the TDS of the pure water is 10), then 650X 80+ 400X 10X 1050X; when X is 53.3, the dilution effect is predicted to be 50%, and when the dilution with the post water is added (assuming that the dilution amount of the post water is 200ml), and the pure water reflux of the first cup of water is improved (the dilution effect of the pure water is reduced by 50 percent, and the initial dilution effect is about 70 percent), and the preliminary prediction on the dilution effect of the total first cup of water can at least reach more than 80 percent.

FIG. 20 is a graph showing the comparative results of a single-core initial cup of water, and it is apparent from the graph that the desalination rate of the initial cup of water, especially the first three cups of water, is gradually increased and the desalination rate of the initial cup of water, especially the first three cups of water, is gradually decreased relative to the desalination rate of the industrial 4.0 lateral flow membrane after the filter element in the embodiment of the present invention is adopted. Therefore, the filter element in the embodiment of the invention can effectively reduce the TDS value of the initial cup of water.

In one embodiment, both ends of the center tube 20 are penetrated, the pure water discharge port 76 is provided near the first end surface 13, one end of the center tube 20 near the first end surface 13 communicates with the pure water discharge port 76, and one end of the center tube 20 near the second end surface 14 communicates with the pure water storage chamber 73.

Taking the pure water storage chamber 73 as an example having both the end storage chamber 731 and the annular storage chamber 732, in this embodiment, the end of the annular storage chamber 732 near the second end face 14 is open and communicates with the end storage chamber 731, and the end of the annular storage chamber 732 near the first end face 13 is also open, and a water flow passage is formed between the housing 70 and the first sealing wall 41, and communicates with the annular storage chamber 732 and the pure water discharge port 76, respectively.

Specifically, the pure water produced by the membrane element body 10 flows into the center tube 20, wherein a part of the pure water flows from the end of the center tube 20 near the first end face 13 toward the pure water discharge port 76; another portion of the pure water flows from the end of the central pipe 20 near the second end face 14 to the end storage chamber 731 and the annular storage chamber 732, and then flows toward the pure water discharge port 76 via the water flow path.

In this embodiment, pure water is discharged from both ends of the central tube 20, so that the pressure on the pure water side can be reduced, the pure water can be rapidly prepared, and the water discharge speed can be increased.

In one embodiment, the end of the center tube 20 near the first end surface 13 is closed, the end of the center tube 20 near the second end surface 14 is open, the pure water discharge port 76 is disposed near the first end surface 13, and the pure water storage chamber 73 is communicated with the pure water discharge port 76.

Specifically, the central tube 20 has a first tube section close to the first end surface 13 and a second tube section close to the second end surface 14, the second tube section is provided with a through hole 23, the first tube section and the second tube section are separated by a partition, pure water flows from the through hole 23 of the second tube section to the pure water discharge port 76, and no pure water is discharged from the first tube section. Of course, in other embodiments, the end of the center tube 20 close to the first end face 13 may mean that the end face of the center tube 20 is closed.

Taking the example in which the pure water storage chamber 73 has both the end storage chamber 731 and the annular storage chamber 732, in this embodiment, the end of the annular storage chamber 732 near the second end face 14 is open and communicates with the end storage chamber 731. The end of the annular storage chamber 732 near the first end face 13 is also open and communicates with the pure water discharge port 76.

Specifically, when the filter is turned on, pure water flows into the center tube 20, and all of the pure water flows from the end of the center tube 20 near the second end face 14, for example, from the second tube section to the end storage chamber 731 and the annular storage chamber 732, and is finally discharged from the pure water discharge port 76 of the housing 70 to the outside of the filter cartridge for use by a user. The pure water corresponding to the flow-out of the center pipe 20 is discharged from the pure water discharge port 76 after passing through the end storage chamber 731 and the annular storage chamber 732 and making a turn around the housing 70.

When shutting down, pure water discharge port 76 closes, so can reserve all the time in the pure water storage chamber 73 and have the pure water, this part pure water can mix with some materials that the waste water infiltration came, dilutes it, so when the start-up again, the TDS value greatly reduced of the first glass of water that lives.

The first section of the center pipe 20 may be in communication with the waste water outlet 12, and waste water flowing from the end surface (the side where the first end surface 13 is located or the side where the second end surface 14 is located) of the membrane element body 10 may flow into the first section and flow from the end of the center pipe 20 close to the first end surface 13 to the waste water outlet 75 of the housing 70.

Of course, the end of the central tube 20 close to the first end face 13 can be sealed by the positioning column on the third end cap 60, and after the wastewater flows out from the end face of the membrane element body 10, the wastewater can also directly flow out from the opening on the first end cap 40, the second end cap 50 or the third end cap 60.

Referring to fig. 17 and 18 in combination, in an embodiment, two ends of the central tube 20 are through, the pure water outlet 76 is disposed near the first end surface 13, one end of the central tube 20 near the first end surface 13 is communicated with the pure water outlet 75, and one end of the central tube 20 near the second end surface 14 is respectively communicated with the pure water outlet of the membrane element body 10 and the pure water storage chamber 73.

In this embodiment, the filter cartridge can be a composite filter cartridge and includes a first filter bank 80, the first filter bank 80 being disposed in the annular gap between the membrane element body 10 and the center tube 20. First filter group 80 includes an inner tube 81 and a first filter element 82, inner tube 81 dividing the annular gap into an inner chamber and an outer chamber 85, wherein the inner portion of inner tube 81 is the inner chamber, first filter element 82 is mounted in the inner chamber, and first filter element 82 is disposed around center tube 20, spaced apart to form a first water outlet gap 84. The first filter element 82 is likewise spaced from the inner tube 81 to form a first water inlet gap 83.

The membrane element body 10 is an RO membrane, and the first filter element 82 is a PAC filter element.

The membrane element body 10 and the first filter group 80 in the above combination occupy the minimum space under the condition of meeting the filtering requirement of the composite filter element, can improve the utilization efficiency of the inner space of the shell 70 to the maximum extent, is beneficial to reducing the volume of the composite filter element, and provides convenience for users to use.

Specifically, the raw water enters the first water inlet gap 83, flows in the radial direction of the first filter element 82, is filtered by the first filter element 82, enters the first water outlet gap 84, and then flows out of the first water outlet gap 84. Then, water flows in from a raw water inlet on the end face of the membrane element body 10, and after being filtered by the membrane element body 10, wastewater is discharged from a wastewater outlet, and pure water flows out from a pure water outlet to the outer chamber 85. Then a part of the pure water flows into the center pipe 20 from one of the end portions of the center pipe 20 and flows toward the pure water discharge port 76 from the other end portion; the other part of the pure water flows directly to the pure water storage chamber 73.

The filter element further comprises a framework 93, the framework 93 is cylindrical, the membrane element body 10 is wound on the framework 93, the first filtering group 80 is located in the framework 93 and is arranged at an interval with the framework 93, and the interval is the outer cavity 85. The frame 93 has a plurality of water holes formed in the peripheral wall thereof for allowing pure water discharged from the membrane element body 10 to flow into the frame 93.

The frame 93 is substantially open at one end and closed at the other end, that is, one end of the frame 93 is open and the other end is provided with a cover plate 94. The open end of the frame 93 is used for installing the first filter unit 80, and the open end can be connected with the first filter unit 80 in a sealing manner or connected with other structures in a sealing manner, so that water flow is prevented from entering and exiting from the open end. The end of the first filter group 80 is spaced from the cover plate 94 of the frame 93 to form a pure water chamber, and the central tube extends into the pure water chamber partially or not.

In addition, the filter element further comprises a second filter group 90, the second filter group 90 is disposed in the pure water chamber, and similarly, the second filter group 90 may be disposed around the central pipe, the pure water chamber is partitioned into a second water inlet gap 91 and a second water outlet gap 92, the second water inlet gap 91 is located on the outer periphery of the second filter group 90, and the second water outlet gap 92 is located on the inner periphery of the second filter group 90.

The second filter group 90 may specifically employ an activated carbon filter structure.

A water outlet hole 95 is formed in the cover plate 94 of the framework 93, and the second water outlet gap 92 is communicated with the pure water storage cavity through the water outlet hole 95.

Specifically, the pure water in the outer chamber 85 can flow into the second water inlet gap 91, and the pure water is filtered by the second filter group 90 and then flows into the second water outlet gap 92. Wherein a portion of the pure water enters the center tube from the end of the center tube and flows out to the pure water discharge port from the other end of the center tube 20. The other part of the pure water flows into the pure water storage chamber 73 from the water outlet hole 95 of the skeleton 93.

The invention further provides a water purifier, which comprises a filter element, and the structure of the filter element is shown in the embodiment and is not described herein again.

The above description is only an alternative embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. A preparation method of a reverse osmosis membrane element is characterized by comprising the following steps:

and drying and curing the semi-finished product assembly.

2. The method of manufacturing a reverse osmosis membrane element according to claim 1, wherein the step of winding the sealing winding strip around the outer circumferential surface of the membrane element body by glue to seal the outer circumferential surface of the membrane element body to produce a semi-finished assembly comprises the steps of:

soaking the sealing winding strip in glue;

3. The method of manufacturing a reverse osmosis membrane element of claim 2, further comprising the steps of:

winding the seal winding strip on a first roller;

a second roller is arranged in the glue tank;

sleeving the membrane element body on the third roller;

4. The method of manufacturing a reverse osmosis membrane element of claim 3, wherein the step of winding the seal wrap around the first roller comprises:

5. The method of manufacturing a reverse osmosis membrane element according to claim 1, wherein the step of winding the sealing winding strip around the outer circumferential surface of the membrane element body by glue to seal the outer circumferential surface of the membrane element body to produce a semi-finished assembly comprises the steps of:

coating glue on the peripheral surface of the membrane element body;

6. The method for manufacturing a reverse osmosis membrane element according to any one of claims 1 to 5, wherein the step of winding the sealing wrap around the outer circumferential surface of the membrane element body by glue to seal the outer circumferential surface of the membrane element body to produce a semi-finished assembly comprises the steps of:

7. The method of manufacturing a reverse osmosis membrane element according to any one of claims 1 to 5, wherein the step of winding the sealing wrap around the outer circumferential surface of the membrane element body by glue to seal the outer circumferential surface of the membrane element body to produce a semi-finished assembly comprises:

8. The method of making a reverse osmosis membrane element of claim 1, wherein the seal wrap strips are fiberglass.

9. A reverse osmosis membrane element produced by the method for producing a reverse osmosis membrane element according to any one of claims 1 to 8.

10. A filter cartridge comprising a housing and a reverse osmosis membrane element of claim 9;