CN111115864B

CN111115864B - Composite filter element components

Info

Publication number: CN111115864B
Application number: CN201811287556.8A
Authority: CN
Inventors: 桂鹏; 李杨敏; 郑跃东; 高宏
Original assignee: Midea Group Co Ltd; Foshan Shunde Midea Water Dispenser Manufacturing Co Ltd
Current assignee: Midea Group Co Ltd; Foshan Shunde Midea Water Dispenser Manufacturing Co Ltd
Priority date: 2018-10-31
Filing date: 2018-10-31
Publication date: 2024-10-01
Anticipated expiration: 2038-10-31
Also published as: CN111115864A

Abstract

The present invention discloses a composite filter element assembly, comprising: a housing, a first filter element, a waterway partition, a second filter element, and a third filter element. A first accommodating chamber and a second accommodating chamber are separated in the housing by a transition plate, and a transition port is provided on the transition plate. The first filter element and the second filter element are arranged in the first accommodating chamber, and the third filter element is arranged in the second accommodating chamber. A first uniformly distributed flow channel and a second uniformly distributed flow channel are formed on both sides of the first filter element, respectively, and the first uniformly distributed flow channel is connected to a first inlet and outlet on the housing. The waterway partition is spaced between the first filter element and the second filter element. A third uniformly distributed flow channel is defined between the waterway partition and the second filter element, and a fourth uniformly distributed flow channel is provided on the other side of the second filter element, the second uniformly distributed flow channel is connected to the second inlet and outlet, and when the third uniformly distributed flow channel is connected to the third inlet and outlet, the fourth uniformly distributed flow channel is connected to the transition port. The composite filter element assembly of the present invention has high integration, small size, large flux, convenient installation and replacement, and good filtering effect.

Description

Composite filter element assembly

Technical Field

The invention belongs to the technical field of water purification, and particularly relates to a composite filter element assembly.

Background

Tap water delivered to individual users from municipal water works typically contains a certain amount of salt ions, metal species, chlorides, microorganisms, silt, etc. In order to improve the drinking quality, more families choose to install water purifiers on a water outlet pipe of tap water, and filter elements with multiple functions are arranged in the water purifiers so as to remove different types of harmful substances in the tap water.

Generally, the existing water purifier filter element is generally 3-4-level, and part of manufacturer water purifier filter elements are double-core. In order to improve the filter effect of the composite filter element assembly, a plurality of filter element assemblies are usually arranged in the water purifier, water inlets and water outlets between the filter element assemblies are sequentially connected in series, water inlet cavities and water outlet cavities are respectively formed on two sides of different filter elements, three-stage and four-stage filter element assemblies are often required to be connected in series in order to achieve high-quality drinking water, and external pipelines are required to be connected between the water outlets and the water inlets between the different filter element assemblies, so that the pipeline system of the composite filter element assembly is complex, the whole water purifier occupies a large space, and the filter elements are inconvenient to install and replace.

Disclosure of Invention

The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the invention provides the composite filter element assembly, which has small volume and good filtering effect.

A composite filter element assembly according to an embodiment of the invention, comprising: the shell is internally provided with a first accommodating cavity and a second accommodating cavity, the first accommodating cavity and the second accommodating cavity are separated by a transition plate, the transition plate is provided with a transition port, and the shell is provided with a first inlet and outlet, a second inlet and outlet, a third inlet and outlet and a fourth inlet and outlet; the first filter piece is arranged in the first accommodating cavity, a first uniform distribution flow passage is defined between the first filter piece and the inner wall of the first accommodating cavity, and the first uniform distribution flow passage is connected with the first inlet and the first outlet; the second filter piece is arranged in the first accommodating cavity; the water path spacing plate is spaced between the first filtering piece and the second filtering piece, a second uniform distribution flow channel is defined between the water path spacing plate and the first filtering piece, a third uniform distribution flow channel is defined between the water path spacing plate and the second filtering piece, a fourth uniform distribution flow channel is arranged on one side, far away from the third uniform distribution flow channel, of the second filtering piece, the second uniform distribution flow channel is connected with the second inlet and outlet, one of the third uniform distribution flow channel and the fourth uniform distribution flow channel is connected with the third inlet and outlet, and the other of the third uniform distribution flow channel and the fourth uniform distribution flow channel is connected with the transition port; and the third filter piece is arranged in the second accommodating cavity.

According to the composite filter element assembly provided by the embodiment of the invention, three groups of filter elements are integrally arranged in the composite filter element assembly, so that the filter function is diversified, and the final filtering effect of tap water is ensured. The integrated level is high, the whole volume is small, and the space required during installation is greatly reduced. The first filter piece, the second filter piece and the third filter piece are respectively separated by arranging the transition plate and the waterway partition plate in the shell, and the whole arrangement is compact. The third filter element in the second accommodating cavity forms a series connection relationship with the second filter element in the first accommodating cavity through the transition port, an external connecting pipeline is not required to be arranged, and the material cost and the space are saved to a certain extent. As can be seen from the arrangement of the uniformly distributed flow passages on both sides of each filter element, the filter water flow passing path is short and the flow quantity is large.

According to the composite filter element assembly provided by the embodiment of the invention, the first filter element, the waterway spacing plate and the second filter element are sequentially sleeved in a cylindrical shape, and the central cavity of the second filter element is the fourth uniform distribution flow channel.

A composite filter element assembly according to one embodiment of the invention, further comprising: the first inner end cover is matched with the axial end face, facing the transition port, of the second filter element so as to block the second filter element and the fourth uniform distribution flow channels.

A composite filter element assembly according to one embodiment of the invention, further comprising: the first outer end cover is matched with the axial end face, facing the transition port, of the first filter element, and the waterway partition plate is connected to the first outer end cover so as to block the first filter element and the second uniform distribution flow channels.

According to a further embodiment of the invention, a first insertion tube is arranged on the first outer end cover, the first insertion tube is inserted into the transition port, and the first insertion tube is in sealing fit with the inner wall of the transition port.

A composite filter element assembly according to one embodiment of the invention, further comprising: the second inner end cover is matched with the axial end face, far away from the transition port, of the second filter element so as to block the second filter element, an inner port communicated with the third inlet and the third outlet is formed in the second inner end cover, the second outer end cover is matched with the axial end face, far away from the transition port, of the first filter element so as to block the first filter element, and an outer port sleeved on the inner port is formed in the second outer end cover.

According to a further embodiment of the invention, a first connecting pipe and a second connecting pipe are arranged on the inner peripheral wall of the shell, the inner end of the second inner end cover is connected with the first connecting pipe in a plug-in mode, and the outer end of the second outer end cover is connected with the second connecting pipe in a plug-in mode.

According to a further embodiment of the present invention, a third connection pipe is disposed on an inner peripheral wall of the housing, a second middle end cover is further disposed in the first accommodating cavity, the second middle end cover is fitted on a peripheral wall of the waterway partition, a middle port sleeved on the inner port is disposed on the second middle end cover, and the middle port of the second middle end cover is in plug connection with the third connection pipe.

According to the composite filter element assembly provided by the embodiment of the invention, the third filter element is formed into a cylindrical shape, a fifth uniform distribution flow passage is defined between the third filter element and the inner wall of the second accommodating cavity, the fourth inlet and the fourth outlet are communicated with the fifth uniform distribution flow passage, and the center of the third filter element is opposite to the transition port.

According to a further embodiment of the present invention, a fifth inlet and outlet is provided on the housing, and the composite filter element assembly further includes a reverse osmosis membrane element, and the reverse osmosis membrane element includes: the device comprises a central tube group and a plurality of reverse osmosis membrane bags, wherein the central tube group comprises a central tube and a plurality of waste water headers which are arranged at intervals, the waste water headers are arranged around the central tube, a filtering water inlet is formed in the wall of the central tube, and a waste water inlet is formed in the wall of the waste water header; the reverse osmosis membrane sheet bags having a first portion located inside the central tube group and a second portion located outside the central tube group, each of the wastewater header and the central tube being separated by at least one first portion of the reverse osmosis membrane sheet bag, the second portions of the plurality of reverse osmosis membrane sheet bags forming a multi-layered membrane module around the periphery of the central tube group; wherein the multi-layer membrane assembly forms the third filter element, the waste water collecting pipe is connected with the fifth inlet and outlet, and the central pipe is connected with the transition port.

Specifically, the composite filter element assembly further comprises: the third end cover is matched with the end face of the reverse osmosis membrane element, which faces the transition port, and two ends of the third end cover are provided with a second insertion pipe and a third insertion pipe which are communicated with each other, the second insertion pipe is inserted into the transition port, and the third insertion pipe is connected with the central pipe; the fourth end cover is matched with the end face, far away from the transition port, of the reverse osmosis membrane element, and a waste discharge port which is respectively connected with the waste water collecting pipe and the fifth inlet and outlet is formed in the fourth end cover.

According to a further embodiment of the invention, a fourth connecting pipe is arranged on the inner peripheral wall of the shell, the fourth connecting pipe is communicated with the fifth inlet and outlet, a fourth insertion pipe is arranged on the fourth end cover, and the fourth insertion pipe is connected with the fourth connecting pipe in an inserting mode.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

FIG. 1 is a schematic general structural view of a composite filter element assembly according to one embodiment of the invention.

FIG. 2 is a schematic illustration of the internal structure of a composite filter element assembly according to one embodiment of the invention.

Fig. 3 is a top view of fig. 2.

Fig. 4 is a bottom view of fig. 2.

Fig. 5 is a schematic view of the internal structure of fig. 2, omitting the first filter element, the second filter element, and the third filter element.

Fig. 6 is a top view of a third end cap according to one embodiment of the present invention.

Fig. 7 is a bottom view of a third end cap according to one embodiment of the present invention.

Fig. 8 is a bottom view of a fourth end cap according to one embodiment of the present invention.

Fig. 9 is a top view of a fourth end cap according to one embodiment of the present invention.

FIG. 10 is a schematic perspective view of a central tube and a wastewater header according to an embodiment of the present invention.

FIG. 11 is a top view of a reverse osmosis membrane bag and center tube, a wastewater header, in accordance with one embodiment of the invention.

Fig. 12 is a top view of a reverse osmosis membrane element in one embodiment of the invention.

Reference numerals:

Composite filter element assembly 1000;

A first accommodation chamber 100;

a first filter element 10; the first uniform distribution flow channels 11; a second uniform flow channel 12;

a first port 101; a second port 102;

a second filter 20; a third uniform flow channel 21; fourth uniform flow channels 22;

A third port 201;

A first inner end cap 41;

A first outer end cap 42; a first cannula 421;

a second inner end cap 43; an inner port 431; a fifth cannula 432;

A second outer end cap 44; an outer port 441; sixth cannula 442;

a second middle end cap 45; a middle port 451; a seventh cannula 452;

A waterway partition plate 46;

A spacer bracket 49;

a second accommodation chamber 200;

a third filter 30; fifth uniform flow channels 31; a filtering membrane 32; a central tube 33; a waste water header 34;

A fifth port 301; a fourth port 302;

A third end cap 47; a second cannula 471; a third cannula 472; a first positioning protrusion 473; a first mounting location structure 474;

A fourth end cap 48; a fourth cannula 481; a waste outlet 482; a second positioning projection 483; a second mounting location structure 484;

a housing 300;

a first bottle cap 310; a first adapter tube 311; a second nipple 312; a third connection pipe 313;

a second bottle cap 320; a fourth connection pipe 321;

a bottle 330; a transition plate 331; transition port 332.

Detailed Description

Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.

The structure of a composite filter element assembly 1000 in accordance with an embodiment of the present invention is described below with reference to fig. 1-12.

A composite filter element assembly 1000 according to an embodiment of the invention, as shown in fig. 1 and 2, includes: the housing 300, the first filter 10, the second filter 20, the waterway partition 46, and the third filter 30.

As shown in fig. 2 and 5, the housing 300 defines a first receiving chamber 100 and a second receiving chamber 200 therein, and the first receiving chamber 100 and the second receiving chamber 200 are spaced apart by a transition plate 331. The transition plate 331 is provided with a transition port 332. Here, the transition plate 331 causes the first receiving chamber 100 and the second receiving chamber 200 to form two generally spaced chambers within the housing 300, which communicate only through the transition port 332.

As shown in fig. 3, the housing 300 is provided with a first port 101, a second port 102, a third port 201, and a fourth port 302.

The first filter element 10 is disposed in the first accommodating cavity 100, a first uniform distribution runner 11 is defined between the first filter element 10 and the inner wall of the first accommodating cavity 100, and the first uniform distribution runner 11 is connected with the first inlet and outlet 101. Here, the first uniformly distributed flow channels 11 may uniformly distribute the liquid to be purified in the first filter element 10, or may uniformly distribute the purified liquid in the first filter element 10.

The second filter element 20 is disposed within the first receiving chamber 100, and the waterway partition 46 is spaced between the first filter element 10 and the second filter element 20. The waterway partition 46 separates the first filter member 10 and the second filter member 20 in the first receiving chamber 100 to form two independent purifying waterways. Other filtering pieces can be connected between the two groups of filtering pieces; it is also possible to directly connect the water inlet of the first filter 10 with the water outlet of the second filter 20, or directly connect the water outlet of the first filter 10 with the water inlet of the second filter 20, so that the purifying waterways between the first filter 10 and the second filter 20 form a tandem relationship.

The waterway spacer plate 46 defines the second uniform flow path 12 with the first filter element 10. Here, when the liquid to be purified of the first filter element 10 is uniformly distributed in the first uniformly distributed flow channel 11, the purified liquid of the first filter element 10 is uniformly distributed in the second uniformly distributed flow channel 12; conversely, the same applies.

The second uniform distribution flow channel 12 is connected with the second inlet and outlet 102. That is, when the first inlet/outlet 101 is an inlet, the second inlet/outlet 102 is an outlet; when the first inlet 101 is an outlet, the second inlet 102 is an inlet.

A third uniform distribution runner 21 is defined between the waterway partition 46 and the second filter element 20, a fourth uniform distribution runner 22 is arranged on one side of the second filter element 20 far away from the third uniform distribution runner 21, one of the third uniform distribution runner 21 and the fourth uniform distribution runner 22 is connected with a third inlet and outlet 201, and the other of the third uniform distribution runner 21 and the fourth uniform distribution runner 22 is connected with a transition port 332. Here, when the third uniform distribution flow channel 21 is connected to the transition port 332, the fourth uniform distribution flow channel 22 is connected to the third inlet and outlet 201; when the third uniform distribution flow channel 21 is connected with the third inlet and outlet 201, the fourth uniform distribution flow channel 22 is connected with the transition port 332.

The third filter 30 is disposed in the second receiving chamber 200. Here, the third filter element 30 may further increase the overall filtering function of the composite filter element assembly 1000, and improve the quality of the water.

It can be appreciated that, by arranging three groups of filter elements in one shell 300, the composite filter element assembly 1000 has high integration degree and compact structure, is beneficial to reducing the structural size, has diversified filter functions, can respectively form primary filter, secondary filter and final filter, and can filter different impurities at the same time, has high filter efficiency, and ensures the integral filter effect of the composite filter element assembly 1000.

The three groups of filter elements are respectively distributed in different cavities, the first filter element 10 and the second filter element 20 are arranged in the same cavity, and the third filter element 30 is arranged in the other cavity, compared with the mode that one group of filter elements are arranged in each filter element shell in the prior art, each filter element is connected through an external pipeline, the invention reduces the arrangement of the external connecting pipeline to a certain extent, further reduces the external space required during installation, and saves the internal volume of a cabinet of a user; meanwhile, the overall attractive performance is enhanced.

The first accommodating cavity 100 and the second accommodating cavity 200 are arranged at intervals in the axial direction, one of the uniformly distributed flow passages on two sides of the second filter element 20 is communicated with the second accommodating cavity 200 through the transition opening 332 on the transition plate 331, the two accommodating cavities (100, 200) are matched compactly, and the external connecting pipelines required to be paved when water filtered by the third filter element 30 flows to the second filter element 20 for filtering are saved; it is also possible to save the external connection pipes that the water filtered by the second filter element 20 needs to be laid when flowing to the third filter element 30 for filtering. The composite filter element assembly 1000 is advantageously reduced in overall size. The arrangement of the external pipeline is facilitated to be simplified.

From the layout positions of the first uniform distribution flow channel 11, the second uniform distribution flow channel 12, the third uniform distribution flow channel 21 and the fourth uniform distribution flow channel 22, most of the water flows pass along the radial direction of the first accommodating cavity 100 when passing through the first filter element 10 and the second filter element 20, and the passing path is short and the flow quantity is large. And the impurities on the surface of the filter element are washed out when the water flow passes through the filter element, and the water flow can easily wash out the impurities and pass through the filter element. And most of water flows basically flow along the axial direction when water flows in and out of each filter element, so that the water flows are uniformly distributed, the washed impurities are brought to the axial end part, and the impurities are prevented from being blocked on the surface of the filter element.

Compared with the prior art that two groups of filter elements are integrated in one filter element assembly, the filter element assembly has higher integration level and stronger function. When the filter element is replaced, the corresponding filter element can be replaced only by disassembling different end parts of the shell 300 and corresponding end caps of the filter elements, the replacement is simple, the operation is easy, the possibility is provided for the client to replace in person, and the maintenance cost is reduced. Even if the filter element in the accommodating cavity cannot be removed after being installed, as all the filter elements are arranged in the shell 300, only one set of positioning and installing structure is needed when the composite filter element assembly 1000 is integrally installed, and the assembly is simple and time-saving.

In the embodiment of the invention, the inner cavity of the shell is divided into the first accommodating cavity 100 and the second accommodating cavity 200 through the transition plate 331, and the design of the inner cavity of the shell can also meet the requirements of different filtering structures on water pressure. For example, the filtration flow resistance in the first accommodating cavity 100 is small, so that the first accommodating cavity 100 is designed as a low-pressure cavity, the water purifying system does not need to configure a booster pump for the first accommodating cavity 100, the bearing pressure of the internal parts of the first accommodating cavity 100 and the corresponding connectors is small, and the assembly sealing reliability of the parts is low. The second accommodating chamber 200 has high filtration flow resistance, and the booster pump can be independently configured for the second accommodating chamber 200 at this time, and meanwhile, the bearing capacity of the internal parts of the second accommodating chamber 200 and the corresponding connecting pipes is ensured. The two parts are arranged separately, which is beneficial to reducing the cost.

In some embodiments of the present invention, as shown in fig. 1 and 5, the housing 300 includes: the bottle 330 and two bottle caps, the both ends of bottle 330 are opened, two bottle caps are cooperated at the both ends of bottle 330, each bottle cap is detachably connected on bottle 330 in a sealing way. Here, the removable connection may be a threaded connection, i.e. the end of the bottle body 330 and the cap are provided with external threads on one side and internal threads on the other side. The bottle body 330 may be connected by a snap, i.e. the end of the bottle body 330 is provided with a snap, and the first bottle cap 310 and the second bottle cap 320 at two ends of the bottle body 330 are provided with a snap hole, so that the bottle body 330, the first bottle cap 310 and the second bottle cap 320 respectively form a snap connection relationship. Of course, other easily conceivable removable attachment means may be used in the present invention, without limitation.

The middle portion of the transition plate 331 is provided with a transition port 332 penetrating in the thickness direction. Alternatively, as shown in fig. 5, when the bottle 330 is a plastic part, the transition plate 331 and the bottle 330 are integrally injection molded, the integral molding is convenient for processing and manufacturing, and the sealing connection between the transition plate 331 and the bottle 330 is very reliable, so that the transition plate 331 is prevented from deflecting, leaking, etc. in the bottle 330 when the impact is applied or the pressure difference between two sides is too large. Of course, the transition plate 331 may be welded to the bottle 330, which is not limited herein.

In some embodiments of the present invention, as shown in fig. 2 and 5, the first filter element 10, the waterway partition 46 and the second filter element 20 are sequentially sleeved in a cylindrical shape, and a central cavity of the second filter element 20 is the fourth uniform distribution channel 22. Here, the fourth uniform flow channel 22 is in the center of the first receiving chamber 100, which is cylindrical. The outer sides of the fourth uniform distribution flow channels 22 are respectively and compactly provided with a layer of second filter elements 20, a layer of third uniform distribution flow channels 21, a layer of waterway spacing plates 46, a layer of second uniform distribution flow channels 12, a layer of first filter elements 10 and a layer of first uniform distribution flow channels 11 in the radial direction, and the third uniform distribution flow channels 21 and the second uniform distribution flow channels 12 are isolated from flowing through the waterway spacing plates 46. The first receiving chamber 100 is compact in overall arrangement, occupies little installation space, and has high integration. The first filter member 10 and the second filter member 20 are conveniently installed.

In some embodiments of the present invention, as shown in fig. 2, the composite filter element assembly 1000 further comprises: the first inner end cover 41 is fitted on the axial end surface of the second filter element 20 facing the transition port 332, so as to block the second filter element 20 and the fourth uniform distribution flow channels 22. The first inner end cap 41 here blocks the second filter element 20 and the fourth uniform distribution flow channel 22, and means that the first inner end cap 41 seals the axial end surfaces of the second filter element 20 and the fourth uniform distribution flow channel 22, so that water in the second filter element 20 and the fourth uniform distribution flow channel 22 cannot flow out or in from the axial end surfaces facing the transition port 332. The meaning of the end cap mentioned below is also the same when it plugs a filter element and a uniform flow channel, and will not be described in detail.

In fig. 2, the first inner end cover 41 closes the bottoms of the second filter element 20 and the fourth uniform distribution flow channel 22, and provides a bottom support for the second filter element 20, so that the liquid to be purified on both sides of the second filter element 20 is effectively prevented from being in series with the purified liquid at the bottom, and the filtering effect of the second filter element 20 is ensured.

Optionally, the first inner end cover 41 is provided with an inner flange extending into the fourth uniform distribution channel 22, and an outer circumferential surface of the inner flange contacts an inner circumferential surface of the second filter element 20. Optionally, the outer periphery of the first inner end cap 41 is provided with a turned-out rim, the inner side of which is in contact with the outer peripheral surface of the second filter element 20. The arrangement of the inner flange and the outward flange can enhance the liquid blocking effect of the first inner end cover 41 on the end surfaces of the fourth uniform distribution flow channel 22 and the second filter element 20; and a foolproof fit can be formed for the first inner end cap 41 and the second filter element 20, which is easy to assemble.

Specifically, the end face of the shaft end of the second filter element 20 is glued to the first inner end cap 41, which not only facilitates assembly, but also facilitates installation of the integral core. Optionally, the second filter element 20 is sealingly attached to the first inner end cap 41 by a bead of hot melt adhesive.

In some embodiments of the present invention, as shown in fig. 2 and 5, the composite filter element assembly 1000 further comprises: the first outer end cover 42, the first outer end cover 42 is fitted on the axial end face of the first filter element 10 facing the transition port 332, and the waterway partition 46 is connected to the first outer end cover 42 to block the first filter element 10 and the second uniform distribution flow channels 12. As shown in fig. 2, the first outer end cover 42 seals the bottoms of the first filter element 10 and the second uniform distribution runner 12, and provides support for the first filter element 10, so that the liquid to be purified on both sides of the first filter element 10 is effectively prevented from being in series with the purified liquid at the bottom, and the filtering effect of the first filter element 10 is ensured. The waterway spacer 46 is connected to the first outer end cover 42, which is favorable for the first outer end cover 42 to be firmly arranged at a specific position, so that the second uniform distribution flow channel 12 and the third uniform distribution flow channel 21 are reliably separated, the liquid in the first filter element 10 and the second filter element 20 is prevented from being in series flow, and the water quality in each uniform distribution flow channel is prevented from being reduced.

Alternatively, the waterway spacer plate 46 is integrally formed with the first outer end cap 42. The integrated forming is convenient for processing and manufacturing. Gaps are not easy to occur between the integrally formed waterway spacing plate 46 and the first outer end cover 42, and the position is relatively stable.

Optionally, the middle of the first outer end cover 42 protrudes upwards to form a boss, and the first inner end cover 41 is suspended above the boss. That is, a certain gap is formed between the first inner end cap 41 and the boss, so that the third uniform distribution flow passage 21 is kept in communication with the transition port 332, and the purge water paths between the second filter element 20 and the third filter element 30 are connected in series. That is, the water filtered by the second filter 20 may flow to the third filter 30 through the transition 332, and be filtered again by the third filter 30; or the water filtered by the third filter member 30 may flow to the second filter member 20 through the transition port 332 and be filtered again by the second filter member 20.

Optionally, the outer periphery of the first outer end cap 42 is provided with a turned-out rim, the inner side of which is in contact with the outer peripheral surface of the first filter element 10. The outer flange is sleeved outside the middle boss of the first outer end cover 42, and the outer flange is blocked with two sides of the middle boss, so that the liquid blocking effect of the first outer end cover 42 on the end face of the first filter element 10 can be enhanced; and a foolproof fit to the first filter member 10 can be formed, and the assembly is easy.

Specifically, the axial end face of the first filter element 10 is glued to the first outer end cap 42, which not only facilitates assembly, but also facilitates installation of the integral core. Optionally, the first filter element 10 is sealingly attached to the first outer end cap 42 by a bead of hot melt adhesive.

In some embodiments of the present invention, as shown in fig. 5, a first insertion tube 421 is provided on the first outer end cover 42, the first insertion tube 421 is inserted into the transition port 332, and the first insertion tube 421 is in sealing fit with the inner wall of the transition port 332. The first cannula 421 is inserted into the transition port 332, so that on the one hand, the transition port 332 is further closed, and unnecessary streaming of liquid between the first accommodating cavity 100 and the second accommodating cavity 200 is prevented; on the other hand, the flow path connection between the second filter element 20 and the third filter element 30 is made easier.

Specifically, the first cannula 421 is coaxially disposed with the first inner end cap 41, and the inner diameter of the first cannula 421 is smaller than the outer diameter of the first inner end cap 41, such that the first inner end cap 41 and the second filter element 20 are retained within the first outer end cap 42.

Optionally, the gap between the first inner end cover 41 and the first outer end cover 42 is smaller, the first inner end cover 41 contacts with the first outer end cover 42 when being acted towards the first outer end cover 42, and the gap is enlarged when the transition port 332 is used for squeezing out the first inner end cover 41, so that the waterway circulation is more smooth. The provision of the first inner end cap 41 in a suspended design at a small distance from the first outer end cap 42 allows for a delicate balancing of the water pressure as it passes through the second filter element 20. That is, when the water pressure in the fourth uniform distribution flow passage 22 is greater than the water pressure at the transition port 332, the first inner end cover 41 can temporarily seal the transition port 332.

In some embodiments of the present invention, as shown in fig. 2 and 5, the composite filter element assembly 1000 further comprises: a second inner end cap 43 and a second outer end cap 44. The second inner end cover 43 is fitted on an axial end surface of the second filter element 20 far from the transition port 332 to block the second filter element 20, and an inner port 431 communicating with the third inlet 201 is provided on the second inner end cover 43. Here, the second inner end cover 43 closes the top of the second filter element 20, provides connection to the top of the second filter element 20, and provides a trend to the third inlet and outlet 201, so that the liquid to be purified on both sides of the second filter element 20 is effectively prevented from being in series with the purified liquid on the top, and the filtering effect of the second filter element 20 is further ensured. The fluid filtered by the second filter assembly 20 is collected in the fourth uniform distribution flow channel 22 and discharged outwards through the inner port 431.

Optionally, the second inner end cap 43 is provided with a downward turned-out rim on its periphery, the inner side of which is in contact with the outer peripheral surface of the second filter element 20. The second inner end cover 43 is provided with an inner flange extending into the fourth uniform distribution flow passage 22, and the outer peripheral surface of the inner flange is in contact with the inner peripheral surface of the second filter element 20. The provision of each of the inner flange and the flange provides a tighter connection between the second inner end cap 43 and the second filter element 20, increasing the reliability of the connection. And the liquid blocking effect of the second inner end cover 43 on the end face of the second filter element 20 can be enhanced, and the foolproof fit of the second inner end cover 43 can be formed, so that the assembly is easy.

Specifically, the axial end face of the second filter element 20 is glued to the second inner end cap 43, which not only facilitates assembly, but also facilitates installation of the integral core. Optionally, the second filter element 20 is sealingly attached to the second inner end cap 43 by a bead of hot melt adhesive.

The second outer end cap 44 is fitted over the axial end surface of the first filter element 10 remote from the transition port 332 to block the first filter element 10, and the second outer end cap 44 is provided with an outer port 441 which is sleeved over the inner port 431. Correspondingly, the second outer end cover 44 seals the tops of the first filter element 10 and the second uniform distribution runner 12, provides connection for the first filter element 10, separates the first inlet and outlet 101 from the second inlet and outlet 102, effectively prevents the liquid to be purified at the two sides of the first filter element 10 from being in series with the purified liquid at the top, and further ensures the filtering effect of the first filter element 10.

Optionally, the second outer end cap 44 is provided with a downward turned-out rim on its periphery, the inside surface of which is in contact with the outer peripheral surface of the first filter element 10. The provision of the flange provides a tighter connection between the second outer end cap 44 and the first filter element 10, increasing the reliability of the connection. And the liquid blocking effect of the second outer end cover 44 on the end face of the first filter element 10 can be enhanced, and the first filter element 10 can be matched in a foolproof way, so that the assembly is easy.

In particular, the axial end face of the first filter element 10 is glued to the second outer end cap 44, which not only facilitates assembly, but also facilitates installation of the integral core. Optionally, the first filter element 10 is sealingly attached to the second outer end cap 44 by a bead of hot melt adhesive.

In some examples, as shown in fig. 5, the first connection tube 311 and the second connection tube 312 are provided on the inner peripheral wall of the housing 300, and the inner end 431 of the second inner end cover 43 is connected to the first connection tube 311 in a plugging manner, and the outer end 441 of the second outer end cover 44 is connected to the second connection tube 312 in a plugging manner. This manner of assembly of the plug connection makes it very easy to fix the first filter element 10, the second filter element 20 in the housing 300.

It can be seen here that one end of the first filter element 10 is plugged via the first outer end cap 42 onto the transition opening 332, and the other end of the first filter element 10 is plugged via the second outer end cap 44 onto the second connecting tube 312, so that the position of the first filter element 10 is substantially fixed and the assembly step is only a process of plugging both ends, whereby the assembly is very simple and time-saving. And as long as the housing 300 is not deformed, both ends of the first filter member 10 are not separated, whereby it can be seen that the assembling reliability of the first filter member 10 is high.

And one end of the second filter element 20 is inserted into the first connecting tube 311 through the second inner end cover 43, the other end of the second filter element 20 is sealed by the first inner end cover 41, and the interval between the first inner end cover 41 and the first outer end cover 42 is very small, which is equivalent to that the other end of the second filter element 20 is supported by the first outer end cover 42. In this way, the position of the second filter element 20 is also substantially fixed and the assembly step is only one end of the insertion process, so that the assembly is very simple and time-saving. And as long as the housing 300 is not deformed, both ends of the second filter member 20 are not separated, whereby it can be seen that the assembling reliability of the second filter member 20 is high.

In the example of fig. 5, a fifth cannula 432 is formed on the second inner end cap 43, and the mouth of the fifth cannula 432 forms the inner end 431 described above. The fifth cannula 432 may be inserted within the first adapter tube 311, and the fifth cannula 432 may also be inserted outside the first adapter tube 311. To improve the sealing effect, a sealing ring is provided between the fifth cannula 432 and the first adapter tube 311.

In the example of fig. 5, a sixth cannula 442 is formed on the second outer end cap 44, with the mouth of the sixth cannula 442 forming the outer port 441. Sixth cannula 442 may be inserted within second nozzle 312, and sixth cannula 442 may also be inserted outside second nozzle 312. To enhance the sealing effect, a sealing ring is provided between sixth cannula 442 and second nipple 312.

In some examples, as shown in fig. 5, a third connection pipe 313 is provided on the inner peripheral wall of the housing 300, a second middle end cover 45 is further provided in the first accommodating cavity 100, the second middle end cover 45 is fitted on the peripheral wall of the waterway partition 46, a middle port 451 sleeved on the inner port 431 is provided on the second middle end cover 45, and the middle port 451 of the second middle end cover 45 is in plug connection with the third connection pipe 313.

In the embodiment of the present invention, the second middle cap 45 may not be provided, so that the waterway partition 46 may be directly connected to the third connection pipe 313, thereby saving the number of parts. However, since the second filter element 20 is to be assembled to the inner side of the water path partition plate 46, the second filter element cannot be assembled when the opening of the water path partition plate 46 is small, and the assembly of the second outer end cover 44 and the first filter element 10 is affected when the opening of the water path partition plate 46 is large, so that the overall assembly difficulty is increased.

Therefore, it is proposed to provide the second middle end cap 45, and when assembling, the second filter element 20 and other parts are first installed into the waterway partition 46, and then the second middle end cap 45 is connected to the waterway partition 46, so as to meet the assembling requirement and improve the reliability of the whole assembly. On the other hand, when the waterway partition 46 and the first outer end cover 42 are integrally formed, the waterway partition may be manufactured by an integral injection molding method, and in this case, the second middle end cover 45 is not necessarily integrally injection molded for facilitating the mold opening.

The third connection pipe 313 is arranged on the shell 300, the third connection pipe 313 is connected with the middle port 451 in a plugging way, the step of fixing the end part of the waterway partition plate 46 is only in a plugging process, the assembly is very simple, the time is saved, and the reliability is high. In the example of fig. 5, a seventh cannula 452 is formed on the second middle end cap 45, the orifice of the seventh cannula 452 forming the middle port 451 described above. The seventh cannula 452 may be inserted within the third nozzle 313, and the seventh cannula 452 may also be inserted outside the third nozzle 313. In order to improve the sealing effect, a sealing ring is arranged between the seventh cannula 452 and the third connecting tube 313, and a sealing ring is also arranged between the second middle end cover 45 and the waterway partition plate 46.

In the example of fig. 2, the smaller distance between the second middle end cap 45 and the second outer end cap 44 enables a delicate balance of water pressure as the water flows through the first filter element 10. That is, when the water pressure inside the water path dividing plate 46 is greater than the water pressure outside, the second middle cap 45 may be pressed against the second outer cap 44, slowing down the filtering speed of the first filter 10. During normal operation, the water flow squeezes the second middle end cap 45 open, flowing normally toward the second access opening 102.

In some specific examples, all of the components within the first receiving chamber 100 are preassembled as a single piece, i.e., the first filter element 10, the second filter element 20, the first inner end cap 41, the first outer end cap 42, the second inner end cap 43, the second outer end cap 44, the second middle end cap 45 are pre-joined as a single integral front-to-back cartridge. Even the sealing rings at the first adapter tube 311, the second adapter tube 312, the third adapter tube 313 may be preassembled to the fifth cannula 432, the sixth cannula 442, the seventh cannula 452.

Such front and rear integrated cartridges can be directly inserted between the transition plate 331 and the first bottle cap 310 during assembly, and the overall assembly process is greatly simplified. And if the first bottle cap 310 is detachably connected to the bottle body 330, after the use, the user can also replace the front-rear integrated filter element by himself, and the operation steps of the user during the replacement are very easy, so that the core replacement experience of the user is improved, and the core replacement cost is reduced.

Optionally, as shown in fig. 5, the top of the second middle end cap 45, the second inner end cap 43, and the second outer end cap 44 are flush. Facilitating the capping of the top of the first receiving cavity 100 by the first bottle cap 310.

In some embodiments of the present invention, as shown in fig. 2, the third filter 30 is formed in a cylindrical shape, a fifth uniform flow channel 31 is defined between the third filter 30 and the inner wall of the second receiving chamber 200, the fourth inlet and outlet 302 is connected to the fifth uniform flow channel 31, and the center of the third filter 30 is disposed opposite to the transition port 332. Different uniformly distributed flow passages are respectively formed on the inner side and the outer side of the cylindrical third filter element 30, one is fluid to be purified of the third filter element 30, the other is fluid purified of the third filter element 30, and a flow cavity in the middle of the third filter element 30 is communicated with the transition port 332.

In view of the arrangement of the third filter element 30 and the fifth uniform distribution flow channel 31, most of the water flows pass through the third filter element 30 along the radial direction of the third filter element 30, the passing path is short, and the flow rate is high. And the impurities on the surface of the filter element are washed out when the water flow passes through the filter element, and the water flow can easily wash out the impurities and pass through the filter element. Most of water flows basically flow along the axial direction when the filter element is filled with water, so that the water flows are uniformly distributed, the washed impurities are brought to one axial end, and the impurities are prevented from being blocked on the surface of the filter element.

In some examples of the present invention, as shown in fig. 5, the composite filter element assembly 1000 further includes a central tube 33, wherein the central tube 33 is disposed in the center of the third filter element 30, and the wall of the central tube 33 is provided with a water filtering hole, and the inside of the central tube 33 may be purified water filtered by the third filter element 30.

As shown in fig. 2 and 5, the housing 300 is provided with a fifth inlet 301, the center of the third filter 30 is provided with a waste water header 34, the waste water header 34 is connected with the fifth inlet 301, and the waste water header 34 can discharge waste liquid with higher ion concentration.

The features of the invention defined as "first", "second", "third", "fourth" and "fifth" may explicitly or implicitly include one or more of the features for distinguishing between the features described, and not sequentially or lightly.

In some embodiments, as shown in fig. 10-12, the central tube 33, the plurality of wastewater headers 34, and the filtration membrane 32 form a reverse osmosis membrane element, which may be a spiral wound reverse osmosis membrane element, or may be other wound reverse osmosis membrane elements. The following reverse osmosis membrane element is described in terms of the structure of a spiral wound reverse osmosis membrane element.

The filtration membranes 32 are a plurality of groups, the filtration membranes 32 are reverse osmosis membrane bags, each of the wastewater headers 34 and the central tube 33 are separated by at least one first portion of the reverse osmosis membrane bag, and the second portions of the plurality of reverse osmosis membrane bags are formed around the central tube 33 and the tube group of the plurality of wastewater headers 34 to form a multi-layer membrane module. The multi-layer membrane module is a cylinder of a plurality of reverse osmosis membrane bags that form the third filter element 30.

The water flowing into the fifth uniform flow channel 31 flows in the radial direction toward the central tube 33, and the water molecules continuously permeate into the reverse osmosis membrane bags during the flowing process, and the purified water permeated into the reverse osmosis membrane bags continues to flow in the radial direction toward the central tube 33, and part of the purified water flows in the spiral direction toward the central tube 33 under the influence of the extending direction of the membrane. Finally, the purified water enters the central tube 33 from the filtered water inlet and then flows toward the transition port 332. The water which does not permeate into the reverse osmosis membrane bag is concentrated to the waste water collecting pipe 34, the rest waste water flows to the waste water collecting holes on the pipe wall of the waste water collecting pipe 34, the waste water collecting pipe 34 is connected with the fifth inlet and outlet 301, and the waste water is discharged from the fifth inlet and outlet 301.

The reverse osmosis membrane element adopts a side flow water-saving membrane, and improves the flow velocity of the surface of the membrane through side flow water inflow, thereby ensuring higher pure water recovery rate and longer service life of the membrane bag.

Alternatively, the third filter element 30 may be an ultrafiltration membrane module, and specifically, an ultrafiltration membrane cartridge existing in the market may be selected. The principles and techniques of ultrafiltration and reverse osmosis filtration are well known to those skilled in the art and are not described in detail herein. In addition, when the third filter 30 is used as the above-described filter, it is necessary to pressurize the liquid in advance and pump it into the fourth inlet 302.

In some embodiments of the present invention, as shown in fig. 2, 5, 6, 7, the composite filter element assembly 1000 further comprises: the third end cover 47, the third end cover 47 is matched on the end face of the third filter element 30 facing the transition port 332, two ends of the third end cover 47 are provided with a second cannula 471 and a third cannula 472 which are communicated, the second cannula 471 is inserted into the transition port 332, and the third cannula 472 is connected with the central tube 33. Here, the third end cap 47 closes the top of the third filter element 30 and provides a supporting connection of the top to the third filter element 30, effectively preventing the liquid to be purified and the liquid after being purified on both sides of the third filter element 30 from being strung on the top.

The third end cover 47 is inserted into the transition port 332 through the second insertion tube 471, so that on one hand, the sealing is convenient, high-pressure water in the second accommodating cavity 200 is prevented from flowing to the transition port 332 without being filtered by the filter membrane 32, on the other hand, the positioning is performed by using the transition port 332, and the assembly difficulty is reduced while the positioning precision is improved.

The third end cover 47 is inserted on the central tube 33 through the third insertion tube 472, on one hand, the surface contact between the third insertion tube 472 and the wall of the central tube 33 is utilized to realize sealing, on the other hand, the positioning and the installation of the central tube 33 are facilitated, and the central tube 33 is prevented from being skewed and leaking after long-term use.

In addition, as shown in fig. 7, the third end cover 47 is provided with a first positioning protrusion 473, the first positioning protrusion 473 is disposed corresponding to the waste water header 34, one end of the waste water header 34 is inserted on the first positioning protrusion 473, and the first positioning protrusion 473 has a certain foolproof matching function, so that the positioning and installation of the third end cover 47 and the waste water header 34 are facilitated, and the skew of the waste water header 34 after long-term use is prevented.

Optionally, as shown in fig. 6 and 7, the peripheral wall of the third end cover 47 is provided with first assembling and positioning structures 474, and the first assembling and positioning structures 474 are arranged at intervals along the circumferential direction, and the first assembling and positioning structures 474 stop against the inner wall of the casing 300, so as to improve the centering degree of the third filter 30 in the second accommodating cavity 200, and avoid the situation that the third filter 30 is totally skewed and cannot be matched well at the transition port 332.

Advantageously, a sealing ring is provided between the second cannula 471 and the transition port 332.

In some embodiments of the present invention, as shown in fig. 2, 5, 8, 9, the composite filter element assembly 1000 further comprises: the fourth end cover 48 is matched with the end face of the third filter element 30 far away from the transition port 332, and the fourth end cover 48 is provided with a waste outlet 482 connected with the waste water collecting pipe 34 and the fifth inlet 301 respectively.

In addition, as shown in fig. 9, the middle part of the fourth end cover 48 is provided with a second positioning protrusion 483 in a protruding manner, the second positioning protrusion 483 is arranged corresponding to the central tube 33, one end of the central tube 33 is inserted on the second positioning protrusion 483, the second positioning protrusion 483 has a plugging function, and also has a certain foolproof matching function, so that the fourth end cover 48 and the central tube 33 are convenient to position and install, the central tube 33 is prevented from being askew when the central tube 33 is used for a long time, the lower part of the central tube 33 can be closed, and liquid in the central tube 33 is prevented from flowing out.

Optionally, as shown in fig. 8 and 9, the peripheral wall of the fourth end cover 48 is provided with second assembling and positioning structures 484, and the plurality of second assembling and positioning structures 484 are arranged at intervals along the circumferential direction, and the plurality of second assembling and positioning structures 484 are stopped on the inner wall of the housing 300, so that the centering degree of the third filter element 30 in the second accommodating cavity 200 is improved, and the situation that the third filter element 30 is totally skewed to cause that the third filter element 30 cannot be well matched at the fifth inlet and outlet 301 is avoided.

In fig. 2, the fourth end cap 48 closes the bottom of the third filter element 30 and the center tube 33, and provides sealing and support for the bottom of the third filter element 30, so that the liquid to be purified and the purified liquid on both sides of the third filter element 30 are effectively prevented from being in series at the bottom, and the filtering effect of the third filter element 30 is ensured. The waste header 34 communicates the waste outlet 482 with the fifth inlet 301 to allow high salinity waste water to flow out of the housing 300 quickly enough.

In some examples of the present invention, as shown in fig. 5, a fourth connection tube 321 is provided on the inner peripheral wall of the housing 300, the fourth connection tube 321 is provided on the second bottle cap 320 in fig. 5, the fourth connection tube 321 is communicated with the fifth inlet and outlet 301, and a fourth insertion tube 481 is provided on the fourth end cap 48, and the fourth insertion tube 481 is connected with the fourth connection tube 321 in a plugging manner. The plug connection of the fourth cannula 481 with the fourth connecting tube 321 ensures that no series flow occurs between the high concentration waste liquid and the liquid to be purified. In addition, the fourth end cap 48 is secured to the bottom of the housing 300 to prevent the third filter member 30 from being positionally changed during the filtering process.

Optionally, a sealing ring is provided between the fourth cannula 481 and the fourth adapter 321 to improve the tightness.

In some specific examples, all of the components within the second receiving chamber 200 are preassembled as a single piece, namely the central tube 33, the wastewater header 34, the filtration membrane 32, the third end cap 47, and the fourth end cap 48 are pre-connected as an integral reverse osmosis cartridge. Even the sealing rings at the transition port 332, the fourth adapter 321 may be preassembled to the second cannula 471, the fourth cannula 481.

Such an integrated reverse osmosis filter element can be directly inserted between the transition plate 331 and the second bottle cap 320 during assembly, and the whole assembly process is greatly simplified. And if the second bottle cap 320 is detachably connected to the bottle body 330, the user can also replace the integrated reverse osmosis filter element by himself after using, and the operation steps of the user during the replacement are very easy, so that the core replacement experience of the user is improved, and the core replacement cost is reduced.

In some embodiments of the present invention, as shown in fig. 2 and 5, a spacer bracket 49 is disposed in the first accommodating chamber 100, and the spacer bracket 49 is disposed in the second uniform distribution channel 12. The spacing brackets 49 maintain the second uniform flow channels 12 at a specific width and shape, ensuring good fluid flow performance.

Optionally, the spacer brackets 49 are co-rolled with the first filter element 10. The spacing brackets 49 ensure tightness and strength of the overall roll of the first filter element 10.

In some examples of the present invention, the first filter element 10 is a roll made of nonwoven fabric, polypropylene layer, and carbon fiber, and has a long service life. When the filter is used for filtering tap water, sediment, rust and residual chlorine can be primarily removed. Of course, the first filter element 10 may be formed by rolling only one or two filter layers of materials, and is not particularly limited herein.

In some examples of the invention, the second filter 20 is a hollow carbon rod. The filter can be used for final filtration of tap water, and the carbon rod can filter off peculiar smell, organic matters, colloid, iron, residual chlorine and the like in the water body, so that the second filter element 20 can control the quality condition of the drinking water after water is discharged, and the taste is improved. Of course, the second filter element 20 may be formed by combining activated carbon particles, a filter screen and a frame, and is not limited to the arrangement of carbon rods. In addition, the carbon filter medium can be replaced by KDF55 treatment medium (high-purity copper/zinc alloy medium), and residual chlorine in water is removed by electrochemical reaction, mineral scaling is reduced, suspended solid substances such as ferrous oxide are reduced, microorganisms are inhibited, and heavy metals are removed.

For a better understanding of aspects of embodiments of the present invention, the structure of a composite filter element assembly 1000 in one specific embodiment of the present invention is described below in conjunction with fig. 1-12.

The following embodiments illustrate the three stage filtration function of the composite filter element assembly 1000, and illustrate the highly integrated design of the composite filter element assembly 1000, taking purified tap water as an example. The first filter element 10 is exemplified by a roll-type primary filter element formed by rolling a nonwoven fabric, a polypropylene layer, carbon fibers, and a spacer bracket 49; the third filter element 30 is illustrated with a high water saving side stream reverse osmosis membrane as an intermediate filtration. The second filter element 20 is illustrated with a cylindrical hollow carbon rod as an example of a final stage filtration.

As shown in fig. 1,2, 3, 4, and 5, a composite filter element assembly 1000 is provided such that the entire composite filter element assembly 1000 is normally installed in a vertical position. The bottle comprises a shell 300, wherein the shell 300 comprises a bottle body 330 with two open ends, a first bottle cap 310 and a second bottle cap 320 which are closed at two ends, and each bottle cap is in sealing connection with the bottle body 330 through matched threads. And a sealing piece is additionally arranged at the sealing part. The first bottle cap 310 is provided with a first inlet and outlet 101 for running water, a second inlet and outlet 102 for front water outlet and a third inlet and outlet 201 for drinking water outlet. The second bottle cap 320 is provided with a fourth inlet and outlet 302 for the front water of reverse osmosis and a fifth inlet and outlet 301 for the high salinity wastewater of reverse osmosis.

As shown in fig. 2, the inside of the housing 300 is integrally formed with a transition plate 331 disposed perpendicular to the cylinder wall, and the transition plate 331 axially spaces the housing 300 to form the first receiving chamber 100 and the second receiving chamber 200. The middle part of the transition plate 331 is provided with a transition port 332 in the axial direction. The first accommodating chamber 100 and the second accommodating chamber 200 are communicated through a transition port 332.

As shown in fig. 2, two sets of filter units are provided in the first housing chamber 100, namely, a first filter member 10 having a cylindrical shape provided in the center of the first housing chamber 100 is provided as a primary filter unit, and a second filter member 20 provided outside the first housing chamber 100 is provided as a final filter unit. The axial length of the first filter element 10 is greater than the axial length of the second filter element 20. The first filter element 10 and the second filter element 20 are separated by a cylindrical waterway partition 46. An annular first uniform distribution flow channel 11 is defined between the first filter element 10 and the inner wall of the first accommodating cavity 100, and as shown in fig. 2, the first uniform distribution flow channel 11 is connected with the first inlet and outlet 101. The waterway partition 46 and the first filter element 10 define an annular second uniform flow channel 12 therebetween, and the second uniform flow channel 12 is connected to the second inlet and outlet 102. The waterway partition plate 46 and the second filter element 20 define an annular third uniform distribution runner 21 therebetween, and a cylindrical fourth uniform distribution runner 22 is arranged on one side of the second filter element 20 away from the third uniform distribution runner 21. The third uniform distribution runner 21 is connected with a transition port 332, and the fourth uniform distribution runner 22 is connected with the third inlet and outlet 201.

As shown in fig. 2 and 5, the upper end of the second filter element 20 is provided with a second inner end cover 43, the lower end of the second filter element 20 is provided with a first inner end cover 41, and the first inner end cover 41 is matched on the axial end face of the second filter element 20 facing the transition port 332 so as to block the second filter element 20 and the fourth uniform distribution flow channels 22; the second inner end cover 43 is fitted on an axial end surface of the second filter element 20 away from the transition port 332 to block the second filter element 20, and an inner end 431 communicating with the third inlet 201 is provided on the second inner end cover 43. The upper end of the first filter element 10 is provided with a second outer end cover 44, and the second outer end cover 44 is provided with an outer port 441 sleeved outside the inner port 431; the axial end face of the first filter element 10 facing the transition opening 332 is provided with a first outer end cap 42. The first outer end cover 42 is integrally formed with a waterway spacer 46, and the first outer end cover 42 blocks the lower portions of the first filter element 10 and the third uniform distribution channel 21. A second middle end cover 45 is sleeved between the second outer end cover 44 and the second inner end cover 43, the second middle end cover 45 is matched on the peripheral wall of the waterway partition plate 46, and a middle port 451 is formed on the second middle end cover 45. A sealing member is additionally arranged between the second middle end cover 45 and the third connecting pipe 313, and a sealing member is additionally arranged between the second inner end cover 43 and the first connecting pipe 311.

As shown in fig. 5, a first connection pipe 311 is provided on the inner peripheral wall of the housing 300 toward the second inner end cap 43, a second connection pipe 312 is provided on the inner peripheral wall of the housing 300 toward the second outer end cap 44, a third connection pipe 313 is provided on the inner peripheral wall of the housing 300 toward the second middle end cap 45, and the middle port 451 of the second middle end cap 45 is connected with the third connection pipe 313 in a plugging manner. A passage connecting the second port 102 is formed between the third adapter 313 and the second outer cap 44.

As shown in fig. 2 and 11, a cylindrical third filter 30 is provided in the second accommodation chamber 200. A fifth uniform flow channel 31 is defined between the third filter element 30 and the inner wall of the second accommodating cavity 200, and a central tube 33 in the center of the third filter element 30 is arranged opposite to the transition port 332. The wall of the central tube 33 is provided with a water filtering inlet, the third filtering element 30 is composed of a plurality of reverse osmosis membrane bags, each reverse osmosis membrane bag is provided with a first part and a second part, each wastewater header 34 and the central tube 33 are separated by the first part of at least one reverse osmosis membrane bag, and the second parts of the plurality of reverse osmosis membrane bags are formed around the central tube 33 and the tube group composed of the plurality of wastewater headers 34 to form a multi-layer spiral wound type membrane assembly.

As shown in fig. 10, the central tube 33 is formed in a ring shape and provided with five waste water headers 34, and each waste water header 34 is connected to the fifth inlet/outlet 301 through the second bottle cap 320. One membrane bag for each wastewater header 34.

As shown in fig. 2, 5, 6, 7, 8 and 9, the third filter element 30 is provided with a third end cover 47 and a fourth end cover 48 at two ends thereof, the third end cover 47 is sealed at one end of the third filter channel and the waste water circulation cavity facing the first accommodating cavity 100, and the fourth end cover 48 is sealed at one end of the third filter channel and the filtered water circulation cavity far from the first accommodating cavity 100. The two ends of the third end cover 47 are provided with a second cannula 471 and a third cannula 472 which are communicated, the second cannula 471 is inserted into the transition port 332, and the third cannula 472 is connected with the central tube 33. The third end cap 47 is provided with a first positioning protrusion 473 for foolproof engagement with the waste pipe 34. The peripheral wall of the third end cap 47 is provided with a first fitting location structure 474 that fits over the top of the third filter element 30. The fourth end cap 48 is provided with a waste outlet 482 connected to the waste header 34. A fourth connecting pipe 321 is arranged on the inner peripheral wall of the shell 300 towards the fourth end cover 48, the fourth connecting pipe 321 is communicated with the fifth inlet and outlet 301, a fourth insertion pipe 481 is arranged on the fourth end cover 48, and the fourth insertion pipe 481 is connected with the fourth connecting pipe 321 in an inserting mode. The fourth end cover 48 is provided with a second positioning protrusion 483 in sealing fit with the central tube 33. A second fitting and positioning structure 484 is provided on the peripheral wall of the fourth end cap 48 to fit the bottom of the third filter element 30. A sealing ring is added between the third end cap 47 and the first outer end cap 42. A sealing ring is added between the first outer end cover 42 and the transition port 332.

The whole tap water filtering process is that tap water enters the first uniform distribution flow channel 11 from the first inlet and outlet 101, flows to the radial inner side, flows to the second uniform distribution flow channel 12 after being filtered by the first filtering piece 10, and flows out as front water from the second inlet and outlet 102 at the upper part. The effluent front water is pressurized and pumped into the fourth inlet and outlet 302 and is uniformly distributed in the fifth uniform distribution flow channel 31, flows in from the side direction of the side flow reverse osmosis water-saving film and is filtered by the third filter 30, the high salinity wastewater is collected by the wastewater header 34 and is discharged from the fifth inlet and outlet 301, and the pure water is collected upwards by the central tube 33 and passes through the transition port 332. Pure water enters the third uniform distribution flow channel 21 from the transition port 332, is filtered by the second filter element 20 along the radial direction, enters the fourth uniform distribution flow channel 22, and flows out of the third inlet and outlet 201 for drinking.

In the description of the present invention, it should be understood that the terms "center", "length", "upper", "lower", "front", "rear", "left", "right", "vertical", "top", "bottom", "inner", "outer", "axial", "radial", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.

In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

Other components of the composite filter element assembly 1000 according to embodiments of the invention, such as the filtering function of each filter element, the selection of materials for each filter element, and the order in which each filter element is arranged, are known to those of ordinary skill in the art and will not be described in detail herein.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A composite filter element assembly, comprising:

The shell is internally provided with a first accommodating cavity and a second accommodating cavity, the first accommodating cavity and the second accommodating cavity are separated by a transition plate, the transition plate is provided with a transition port, and the shell is provided with a first inlet and outlet, a second inlet and outlet, a third inlet and outlet and a fourth inlet and outlet;

the first filter piece is arranged in the first accommodating cavity, a first uniform distribution flow passage is defined between the first filter piece and the inner wall of the first accommodating cavity, and the first uniform distribution flow passage is connected with the first inlet and the first outlet;

The second filter piece is arranged in the first accommodating cavity;

The water path spacing plate is spaced between the first filtering piece and the second filtering piece, a second uniform distribution flow channel is defined between the water path spacing plate and the first filtering piece, a third uniform distribution flow channel is defined between the water path spacing plate and the second filtering piece, a fourth uniform distribution flow channel is arranged on one side, far away from the third uniform distribution flow channel, of the second filtering piece, the second uniform distribution flow channel is connected with the second inlet and outlet, the fourth uniform distribution flow channel is connected with the third inlet and outlet, and the third uniform distribution flow channel is connected with the transition port;

The third filter piece is arranged in the second accommodating cavity;

The third filter element is formed into a cylinder shape, a fifth uniform flow passage is defined between the third filter element and the inner wall of the second accommodating cavity, the fourth inlet and the fourth outlet are communicated with the fifth uniform flow passage, and the center of the third filter element is opposite to the transition port;

Wherein the second inlet and outlet is communicated with the fourth inlet and outlet; the first filter piece, the waterway partition plate and the second filter piece are sequentially sleeved in a cylindrical shape, and the central cavity of the second filter piece is the fourth uniform flow channel; further comprises: the first inner end cover is matched with the axial end face of the second filter element, which faces the transition port, so as to block the second filter element and the fourth uniform distribution flow channel; further comprises: the first outer end cover is matched with the axial end face of the first filter element, which faces the transition port, and the waterway partition plate is connected to the first outer end cover so as to block the first filter element and the second uniform distribution flow channels; the middle part of the first outer end cover protrudes upwards to form a boss, and the first inner end cover is suspended above the boss.

2. The composite filter element assembly of claim 1, wherein the first outer end cap is provided with a first cannula, the first cannula is inserted into the transition port, and the first cannula is in sealing fit with the inner wall of the transition port.

3. The composite filter element assembly of claim 1, further comprising: the second inner end cover is matched with the axial end face of the second filter element far away from the transition port so as to block the second filter element, the second inner end cover is provided with an inner port communicated with the third inlet and the third outlet,

The second outer end cover is matched with the axial end face, far away from the transition port, of the first filter piece so as to block the first filter piece, and an outer port sleeved on the inner port is arranged on the second outer end cover.

4. A composite filter element assembly according to claim 3, wherein a first adapter tube and a second adapter tube are provided on an inner peripheral wall of the housing, the inner end of the second inner end cap being plug-in connected to the first adapter tube, the outer end of the second outer end cap being plug-in connected to the second adapter tube.

5. A composite filter element assembly according to claim 3, wherein a third adapter tube is provided on the inner peripheral wall of the housing, a second middle end cap is further provided in the first receiving cavity, the second middle end cap is fitted on the peripheral wall of the waterway partition, a middle port sleeved on the inner port is provided on the second middle end cap, and the middle port of the second middle end cap is in plug connection with the third adapter tube.

6. The composite filter element assembly of claim 1, wherein the housing is provided with a fifth access port, the composite filter element assembly further comprising a reverse osmosis membrane element comprising: the device comprises a central tube group and a plurality of reverse osmosis membrane bags, wherein the central tube group comprises a central tube and a plurality of waste water headers which are arranged at intervals, the waste water headers are arranged around the central tube, a filtering water inlet is formed in the wall of the central tube, and a waste water inlet is formed in the wall of the waste water header;

The reverse osmosis membrane sheet bags having a first portion located inside the central tube group and a second portion located outside the central tube group, each of the wastewater header and the central tube being separated by at least one first portion of the reverse osmosis membrane sheet bag, the second portions of the plurality of reverse osmosis membrane sheet bags forming a multi-layered membrane module around the periphery of the central tube group; wherein the multi-layer membrane assembly forms the third filter element, the waste water collecting pipe is connected with the fifth inlet and outlet, and the central pipe is connected with the transition port.

7. The composite filter element assembly of claim 6, further comprising: the third end cover is matched with the end face of the reverse osmosis membrane element, which faces the transition port, and two ends of the third end cover are provided with a second insertion pipe and a third insertion pipe which are communicated with each other, the second insertion pipe is inserted into the transition port, and the third insertion pipe is connected with the central pipe;

The fourth end cover is matched with the end face, far away from the transition port, of the reverse osmosis membrane element, and a waste discharge port which is respectively connected with the waste water collecting pipe and the fifth inlet and outlet is formed in the fourth end cover.

8. The composite filter element assembly of claim 7, wherein a fourth adapter is provided on an inner peripheral wall of the housing, the fourth adapter is in communication with the fifth inlet and outlet, a fourth cannula is provided on the fourth end cap, and the fourth cannula is in plug connection with the fourth adapter.