CN111115868A - Flow passage structure of composite filter element assembly - Google Patents

Abstract

The invention discloses a flow passage structure of a composite filter element assembly, which comprises: the filter comprises a first filter unit and a second filter unit which are arranged at intervals along the axial direction, wherein the first filter unit is provided with a first inlet and outlet, a second inlet and outlet and a third inlet and outlet, the second filter unit is provided with a fourth inlet and outlet, and a transition flow passage is arranged between the first filter unit and the second filter unit. Wherein, a first uniform distribution flow channel and a second uniform distribution flow channel which are communicated by a first filtering channel, and a third uniform distribution flow channel and a fourth uniform distribution flow channel which are communicated by a second filtering channel are sequentially arranged in the first filtering unit from outside to inside along the radial direction, a first filtering piece is arranged in the first filtering channel, a second filtering piece is arranged in the second filtering channel, and the interval between the second uniform distribution flow channel and the third uniform distribution flow channel is absolutely not communicated. A third filter element is arranged in the second filter unit. The flow channel structure of the composite filter element assembly is compact in arrangement, the arrangement of external connecting pipelines is saved, and the size is small.

Description

Flow passage structure of composite filter element assembly

Technical Field

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

Background

The tap water delivered to each user from a municipal water plant will typically contain a certain amount of salt ions, metallic substances, chlorides, microorganisms, silt, etc. In order to improve the drinking water quality, more and more families choose to install water purifiers on the 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, current purifier filter core is generally 3 ~ 4 grades, and some producer's purifier filter core is two cores. In order to improve the filter effect of compound filter element group spare, arrange multiple filter element group spare in the water purifier usually, advance between each filter element group spare, the delivery port is established ties in proper order, different filter core both sides form the inhalant canal respectively, go out the rivers way, in order to reach the drinking water of high quality, often need establish ties threely, level four filter element group spare, all need the outside pipeline to connect between the exhalant canal between the different filter element group spares and the inhalant canal, it is numerous and diverse to make the inside pipe-line system of purifier, purifier complete machine occupation space is great, inconvenient installation and renew cartridge.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides the flow channel structure of the composite filter element assembly, which has the advantages of compact arrangement, small occupied space and multiple filtering effects.

The flow channel structure of the composite filter element assembly comprises the following components: the filter comprises a first filter unit and a second filter unit which are arranged at intervals along the axial direction, wherein the first filter unit is provided with a first inlet and outlet, a second inlet and outlet and a third inlet and outlet, the second filter unit is provided with a fourth inlet and outlet, a transition flow passage is arranged between the first filter unit and the second filter unit, wherein a first uniform distribution flow passage, a first filter channel, a second uniform distribution flow passage, a third uniform distribution flow passage, a second filter channel and a fourth uniform distribution flow passage are sequentially arranged in the first filter unit from outside to inside along the radial direction, a first filter element is arranged in the first filter channel, a second filter element is arranged in the second filter channel, the first uniform distribution flow passage is communicated with the second uniform distribution flow passage through the first filter channel, the third uniform distribution flow passage is communicated with the fourth uniform distribution flow passage through the second filter channel, and the second uniform distribution flow passage is isolated from the third uniform distribution flow passage and does not circulate, the first uniform distribution flow channel is connected with the first inlet and the first outlet, the second uniform distribution flow channel is connected with the second inlet and the second outlet, one of the third uniform distribution flow channel and the fourth uniform distribution flow channel is connected with the third inlet and the third outlet, and the other of the third uniform distribution flow channel and the fourth uniform distribution flow channel is connected with the transition flow channel; and a third filtering piece is arranged in the second filtering unit.

According to the flow passage structure of the composite filter element assembly, the first filter unit is internally and sequentially provided with four uniformly distributed flow passages and two passages along the radial direction, and the two passages are internally and respectively provided with a group of filter pieces, so that the first filter unit is compact in overall structure and integrates two filter functions. The second uniform distribution runner and the third uniform distribution runner are isolated and do not circulate, so that the first filtering piece and the second filtering piece respectively form front and rear filtering to form two different filtering systems. The first filtering unit and the second filtering unit are arranged at intervals in the axial direction and are connected through the transition flow channel, the two filtering units are compactly matched, and a part of external connecting pipelines are saved. Set up the third in the second filter unit and filter, can further increase the holistic filtering capability of compound filter element group spare, promote the quality of final play water.

According to the flow passage structure of the composite filter element assembly, the second filter unit is provided with the fifth inlet and the fifth outlet, the second filter unit is internally provided with the filtered water circulation cavity and the waste water circulation cavity, the filter membrane is arranged between the filtered water circulation cavity and the waste water circulation cavity, the filtered water circulation cavity is communicated with the transition flow passage, and the waste water circulation cavity is communicated with the fifth inlet and the fifth outlet.

According to a further embodiment of the present invention, a fifth uniformly distributed flow passage and a third filtering passage are sequentially arranged in the second filtering unit from outside to inside along the radial direction, the third filtering passage is arranged around the filtered water flow cavity and the wastewater flow cavity, the third filtering member is arranged in the third filtering passage, the wastewater flow cavity is communicated with the fifth uniformly distributed flow passage through the third filtering passage, and the fifth uniformly distributed flow passage is communicated with the fourth inlet and outlet.

According to the flow channel structure of the composite filter element assembly, the fourth uniform flow channel is cylindrical, and the first uniform flow channel, the first filtering channel, the second uniform flow channel, the third uniform flow channel and the second filtering channel are annular and are sequentially sleeved in layers.

According to the flow channel structure of the composite filter element assembly, a first inner end cover is arranged in the first filter unit, the first inner end cover is sealed on the end faces, facing the second filter unit, of the second filter channel and the fourth uniform distribution flow channels, and the transition flow channels are connected with the third uniform distribution flow channels.

According to the flow channel structure of the composite filter element assembly, a first outer end cover and a water channel spacing barrel are arranged in the first filter unit, the first outer end cover is sealed on the end faces, facing the second filter unit, of the first filter channel and the second uniform flow channel, and the water channel spacing barrel is connected with the first outer end cover and is spaced between the second uniform flow channel and the third uniform flow channel.

According to the flow channel structure of the composite filter element assembly, a second inner end cover and a second outer end cover are arranged in the first filter unit, the second outer end cover is sealed on the end face, far away from the second filter unit, of the first filter channel, and the second inner end cover is sealed on the end face, far away from the second filter unit, of the second filter channel.

According to a further embodiment of the present invention, further comprising: the third end cover is sealed at one end of the third filtering channel and the waste water circulation cavity facing the first filtering unit, and the fourth end cover is sealed at one end of the third filtering channel and the filtered water circulation cavity far away from the first filtering unit.

According to a further embodiment of the present invention, a central pipe and a plurality of wastewater headers are disposed in the second filtering unit, the plurality of wastewater headers are disposed around the central pipe, the filtering membrane is a reverse osmosis membrane bag having a first portion and a second portion, each of the wastewater headers and the central pipe are separated by at least one first portion of the reverse osmosis membrane bag, the second portions of the plurality of reverse osmosis membrane bags form a multi-layer membrane module surrounding the central pipe group, a plurality of barrels formed by rolling the reverse osmosis membrane bags form the third filtering member, the central pipe communicates with the transition flow channel, a filtered water inlet hole is disposed on a wall of each of the plurality of barrels, and the wastewater headers communicate with the fifth inlet and the fifth outlet, and a wastewater inlet hole is disposed on a wall of each of the plurality of barrels.

According to the flow channel structure of the composite filter element assembly, the first filter unit is internally provided with the spacing supports, and the spacing supports are arranged in the second uniform flow channels.

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 above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a schematic diagram of the general structure of a composite filter element assembly according to one embodiment of the present invention.

FIG. 2 is a schematic view of the general structure of a flow channel structure of a composite filter element assembly according to one embodiment of the present invention.

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

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

FIG. 5 is a side view of a third endcap, in accordance with one embodiment of the present invention.

FIG. 6 is a top view of a third endcap of one embodiment of the present invention.

FIG. 7 is a bottom view of a third endcap of one embodiment of the present invention.

FIG. 8 is a bottom view of a fourth endcap, in accordance with one embodiment of the present invention.

FIG. 9 is a top view of a fourth endcap of one embodiment of the present invention.

Figure 10 is a schematic perspective view of a central pipe and waste header of one embodiment of the present invention.

FIG. 11 is a top view of a combination reverse osmosis membrane bag and centertube and a waste header according to one embodiment of the present invention.

FIG. 12 is a top view of a spiral wound reverse osmosis membrane element according to one embodiment of the invention.

Reference numerals:

a composite filter element assembly 1000;

a first filter unit 100;

a first filter member 10; a first uniform distribution flow channel 11; a second uniform distribution flow channel 12; a first filtration channel 13;

a first port 101; a second port 102;

a second filter member 20; a third uniform distribution flow channel 21; a fourth equispaced flow passage 22; a second filtration channel 23; a transition flow passage 24;

a third inlet and outlet port 201;

a second filter unit 200;

a third filter member 30; fifth evenly distributed runners 31; a third filtration channel 32; a center tube 33; a waste water header 34; a filter membrane 35;

a fifth port 301; a fourth port 302;

a first inner end cap 41; a first outer end cap 42; a second inner end cap 43; a second outer end cap 44; a second middle end cap 45; a waterway spacer cylinder 46;

a third end cap 47; a second cannula 471; a third cannula 472; the first positioning projection 473; a first assembly locating feature 474;

a fourth end cap 48; a fourth cannula 481; a waste outlet 482; a second positioning projection 483; a second mating alignment structure 484;

a spacer bracket 49;

a housing 300; a housing upper cover 310; a housing lower cover 320.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

The flow channel structure of the composite cartridge assembly 1000 of an embodiment of the present invention is described below with reference to fig. 1-12.

A flow channel structure of a composite filter element assembly 1000 according to an embodiment of the present invention, as shown in fig. 2, includes: a first filter unit 100 and a second filter unit 200 arranged at an interval in an axial direction.

The first filtering unit 100 is provided with a first inlet and outlet 101, a second inlet and outlet 102 and a third inlet and outlet 201, the second filtering unit 200 is provided with a fourth inlet and outlet 302, and a transition flow passage 24 is arranged between the first filtering unit 100 and the second filtering unit 200. Here, the first filter unit 100 and the second filter unit 200 are arranged at a distance from each other in the axial direction and connected by the transition flow passage 24, and the first filter unit 100 and the second filter unit 200 are compact to fit and form a whole, and a part of external connecting pipes are saved.

The first filtering unit 100 is provided with a first uniform distribution flow channel 11, a first filtering channel 13, a second uniform distribution flow channel 12, a third uniform distribution flow channel 21, a second filtering channel 23 and a fourth uniform distribution flow channel 22 from outside to inside in the radial direction.

The first filter channel 13 is provided with a first filter element 10 and the second filter channel 23 is provided with a second filter element 20. Here, the two purification water paths of the first filter element 10 and the second filter element 20 can increase the filtering performance of the first filter unit 100, and meet the requirements of different water quality and water outlet effects.

The first uniform flow channel 11 is communicated with the second uniform flow channel 12 through a first filtering channel 13, and the third uniform flow channel 21 is communicated with the fourth uniform flow channel 22 through a second filtering channel 23. Here, one of the uniformly distributed flow passages on both sides of the first filtering channel 13 can uniformly distribute the liquid before being filtered by the first filtering piece 10, the other can uniformly distribute the liquid after being filtered by the first filtering piece 10, and both sides of the first filtering piece 10 are uniformly pressed. Similarly, one of the uniformly distributed flow passages on both sides of the second filtering channel 23 can uniformly distribute the liquid before being filtered by the second filtering piece 20, the other can uniformly distribute the liquid after being filtered by the second filtering piece 20, and both sides of the second filtering piece 20 are uniformly pressed.

The second uniform flow channel 12 and the third uniform flow channel 21 are isolated and do not flow. Two uniform flow channels which are not communicated are separated, so that two mutually independent purification water paths in the first filtering unit 100 are not interfered with each other during working. The water outlet of one of the purification water paths can be directly used as the water inlet of the other purification water path; the water discharged from one of the purification water paths can be filtered by other external filtering components and then used as the water inlet of the other purification water path.

The first uniform flow passage 11 is connected with the first inlet and outlet 101, and the second uniform flow passage 12 is connected with the second inlet and outlet 102. Here, if the first inlet/outlet 101 is used as the liquid inlet of the first filter element 10, the second inlet/outlet 102 is used as the liquid outlet of the first filter element 10; the first inlet/outlet 101 serves as a liquid outlet of the first filter element 10, and the second inlet/outlet 102 serves as a liquid inlet of the first filter element 10.

One of the third uniform flow passage 21 and the fourth uniform flow passage 22 is connected with the third inlet/outlet 201, and the other of the third uniform flow passage 21 and the fourth uniform flow passage 22 is connected with the transition flow passage 24. Here, when the third equispaced flow channels 21 are connected to the transition flow channels 24, the fourth equispaced flow channels 22 are connected to the third inlet and outlet ports 201; when the third equispaced flow channels 21 are connected to the third inlet and outlet ports 201, the fourth equispaced flow channels 22 are connected to the transition flow channels 24.

A third filter element 30 is provided in the second filter unit 200. Here, the third filter element 30 can further increase the overall filtering function of the composite filter element assembly 1000, and improve the quality of the discharged water.

It can be understood that four uniform flow passages and two filtering passages are sequentially arranged in the first filtering unit 100 along the radial direction to form two mutually independent purification water paths, and filtering elements are respectively arranged in the two filtering passages. The overall structure of the first filter unit 100 is compact, and two water quality filtering links are integrated in the first filter unit 100, and in addition, a group of filter elements in the second filter unit 200 are integrated, so that the composite filter element assembly 1000 of the present invention has three water quality filtering links.

The first filtering unit 100 and the second filtering unit 200 are arranged at intervals in the axial direction, one of the uniformly distributed flow passages on the two sides of the second filtering piece 20 is connected with the third filtering piece 30 through the transition flow passage 24, the two filtering units (100, 200) are compactly matched, and external connecting pipelines required to be laid when water filtered by the third filtering piece 30 flows to the second filtering piece 20 for filtering are saved; or to save the external connecting pipes needed to be laid when the water filtered by the second filter element 20 flows to the third filter element 30. The composite filter element assembly 1000 is facilitated to reduce the overall size, and the arrangement of external pipelines is facilitated to be simplified.

From the layout positions of the first uniform flow passage 11, the first filtering passage 13, the second uniform flow passage 12, the third uniform flow passage 21, the second filtering passage 23 and the fourth uniform flow passage 22, when the water flow passes through the first filtering piece 10 and the second filtering piece 20, most of the water flow passes through the first filtering unit 100 along the radial direction, the passing path is short, and the flow volume is large. And the impurities on the surface of the filter piece are washed when the water flows through the filter piece in the radial direction, and the water flows through the filter piece after the impurities are more easily washed away. Most of water flow of each filter element flows along the axial direction basically when water enters or exits, so that the uniform distribution of the water flow is facilitated, and the impurities washed away are brought to one axial end of the first filter unit 100, so that the impurities are prevented from being blocked on the surface of the filter element.

With first filter element 100 and second filter element 200 setting in same compound filter element group spare 1000, the integration degree is high, is favorable to reducing the structure size, only needs one set of location, mounting structure when compound filter element group spare 1000 installation, assembles simply, saves time.

In some other examples of the present invention, as shown in fig. 1, the composite filter element assembly 1000 includes a housing 300, and a housing upper cover 310 and a housing lower cover 320 are provided at both ends of the housing 300. The first filter unit 100 and the second filter unit 200 are formed along the axial length in the housing 300. When the first filter element 10 and the second filter element 20 need to be replaced, only the upper housing cover 310 needs to be opened, and when the third filter element 30 needs to be replaced, only the lower housing cover 320 needs to be opened.

In some embodiments of the present invention, as shown in fig. 2, a spacing bracket 49 is provided in the first filter unit 100, and the spacing bracket 49 is provided in the second equispaced flow channels 12. The spacing brackets 49 maintain the second equispaced flow channels 12 in a specific width and a specific shape, ensuring good fluid flow performance.

Alternatively, the spacer bracket 49 is rolled together with the first filter element 10. The spacing bracket 49 ensures the tightness and strength of the integral rolling of the first filter member 10.

In some examples of the present invention, the first filter member 10 is a roll made of a nonwoven fabric, a polypropylene layer, or a carbon fiber. The service life is longer. When the filter is used for filtering tap water, silt, rust and residual chlorine can be removed preliminarily. Of course, the first filter member 10 may be formed by rolling only one or two of the filter layers, and is not particularly limited thereto.

In some examples of the invention, the second filter element 20 is a hollow carbon rod. 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 controls the water quality condition of the drinking water after water outlet and improves the taste. Of course, the second filter 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 a KDF55 processing medium (high-purity copper/zinc alloy medium), residual chlorine in water is removed through electrochemical reaction, mineral scaling is reduced, suspended solid matters such as ferrous oxide and the like are reduced, microorganisms are inhibited, and heavy metals are removed.

In some embodiments of the present invention, as shown in fig. 2, 3, and 4, the second filter unit 200 has a fifth inlet/outlet 301. A filtered water circulation cavity and a waste water circulation cavity are arranged in the second filtering unit 200, a filtering membrane 35 is arranged between the filtered water circulation cavity and the waste water circulation cavity, the filtered water circulation cavity is communicated with the transition flow passage 24, and the waste water circulation cavity is communicated with the fifth inlet and outlet 301. The fifth inlet/outlet 301 is a discharge port for waste water generated by the second filtering unit 200 after filtering. Accordingly, the fourth inlet/outlet 302 is an inlet of the liquid to be filtered of the second filter unit 200.

Here, the third filter member 30 includes a filter membrane 35 between the filtered water passing chamber and the waste water passing chamber. 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 described features, whether sequential or not.

Optionally, as shown in fig. 2, a fifth uniform flow channel 31 and a third filtering channel 32 are sequentially arranged in the second filtering unit 200 from outside to inside in the radial direction, the third filtering channel 32 is arranged around the filtered water flow cavity and the waste water flow cavity, a third filtering element 30 is arranged in the third filtering channel 32, the waste water flow cavity is communicated with the fifth uniform flow channel 31 through the third filtering channel 32, and the fifth uniform flow channel 31 is communicated with the fourth inlet/outlet 302. Here, the liquid entering from the fourth inlet/outlet 302 is distributed and distributed in the fifth uniform flow channel 31, uniformly distributed outside the third filter element 30, and after being filtered by the third filter element 30, the high salinity wastewater flows to the wastewater flow chamber and is discharged through the fifth inlet/outlet 301 (as shown in fig. 4).

When the water flow passes through the third filter element 30, most of the water flow passes through the second filter unit 200 in the radial direction, the passing path is short, the flow rate is large, and the water flow has a scouring effect on impurities on the surface of the filter membrane 35 when passing through the radial direction, so that the water flow can more easily scour the impurities and then passes through the filter membrane 35.

Most of the water flows in and out of the fifth uniform distribution flow channel 31 on the outer side of the third filter element 30 and the water flows in and out of the inner side of the central tube 33 basically flow along the axial direction, so that the uniform distribution of the water flows is facilitated, the impurities washed by the surface of the third filter element 30 are also brought to one axial end of the second filter unit 200, and the impurities are prevented from being blocked on the filter surface.

In some embodiments, as shown in fig. 2, 6, 7, 8 and 9, a central pipe 33 and a plurality of waste water headers 34 are arranged in the second filter unit 200, the plurality of waste water headers 34 are arranged around the central pipe 33, a filter membrane 35 is arranged on the periphery of the central pipe 33, the central pipe 33 is communicated with the transition flow channel 24, and filtered water inlet holes are arranged on the pipe wall. The filter membrane 35 on the outer periphery of the central tube 33 is a reverse osmosis membrane, and only pure water with low salinity and good water quality can pass through the membrane. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In some embodiments, as shown in fig. 10-12, the central pipe 33, the plurality of waste water headers 34, and the filter membrane 35 constitute a spiral wound reverse osmosis membrane element. The lumen of the center pipe 33 constitutes the filtered water flow chamber, and the lumen of the waste water header 34 constitutes the waste water flow chamber.

The plurality of filtration membranes 35 are in groups, the filtration membranes 35 are reverse osmosis membrane bags having a first portion and a second portion, each of the waste water headers 34 and the central tube 33 are separated by the first portion of at least one reverse osmosis membrane bag, and the second portion of the plurality of reverse osmosis membrane bags is formed around the central tube 33 and the group of the plurality of waste water headers 34 to form a multi-layered membrane module.

After being filtered by the reverse osmosis membrane bag, the water entering the second filtering unit 200 from the fourth inlet/outlet 302 spirally flows toward the central tube 33 along the second portion of the reverse osmosis membrane bag, water molecules continuously permeate into the reverse osmosis membrane bag during the flowing process, and the purified water permeating into the reverse osmosis membrane bag also flows toward the central tube 33 along the spiral direction. Finally, purified water flows from the filtered water inlet hole, which flows to the center pipe 33, toward the transition flow passage 24. The high salinity waste water left after filtration flows to the waste water collecting holes on the pipe wall of the waste water collecting pipe 34, and 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. Alternatively, the third filter element 30 of the present invention is a reverse osmosis membrane element (RO membrane element).

Preferably, the reverse osmosis membrane element adopts a side-flow water-throttling membrane, and water flows in through a side flow, so that the surface flow rate of the membrane is improved, the high recovery rate of pure water is ensured, and the service life of the filtering membrane 35 is longer.

Alternatively, the third filter element 30 may be an ultrafiltration membrane module, and in particular, an ultrafiltration membrane cartridge that is commercially available may be used. The principles and techniques of ultrafiltration and reverse osmosis are well known to those skilled in the art and will not be described in detail herein. In addition, when the third filter member 30 is the above filter member, the liquid is pressurized in advance and then pumped into the fourth inlet/outlet 302.

In some embodiments of the present invention, as shown in fig. 2, the fourth uniform flow channel 22 is a cylinder, and the first uniform flow channel 11, the first filtering channel 13, the second uniform flow channel 12, the third uniform flow channel 21, and the second filtering channel 23 are annular and sequentially sleeved in layers. Here, the fourth equispaced flow channels 22 are in the center of the first filter unit 100, which is cylindrical. The outer side of the fourth uniform distribution flow channel 22 is sleeved with a circle of second filtering channel 23, the outer side of the second filtering channel 23 is sleeved with a circle of third uniform distribution flow channel 21, the outer side of the third uniform distribution flow channel 21 is sleeved with a circle of second uniform distribution flow channel 12, the outer side of the second uniform distribution flow channel 12 is sleeved with a circle of first filtering channel 13, and the outer side of the first filtering channel 13 is sleeved with a circle of first uniform distribution flow channel 11. Therefore, each layer of filtering element has a large filtering area, the filtering element has uniform flow distribution, and the first filtering unit 100 is compact in overall arrangement, occupies a small mounting space and has high integration level.

In some embodiments of the present invention, as shown in fig. 2, a first inner end cap 41 is disposed in the first filtering unit 100, and the first inner end cap 41 seals the end surfaces of the second filtering channel 23 and the fourth uniform flow channel 22 facing the second filtering unit 200 to block the second filtering channel 23 and the fourth uniform flow channel 22. The first inner end cap 41 blocking the second uniform filtering channel 23 and the fourth uniform flow channel 22 means that the first inner end cap 41 blocks the axial end surface of the second uniform filtering channel 23 and the fourth uniform flow channel 22, so that the water in the second uniform filtering channel 23 and the fourth uniform flow channel 22 cannot flow out or in from the axial end surface facing the transition flow channel 24. When a certain end cover mentioned below blocks a certain filtering channel and a certain uniformly distributed flow channel, the meanings are the same, and the description is omitted.

In fig. 2, the transition flow channels 24 are connected to the third equispaced flow channels 21. The liquid in the central tube 33 of the third filter element 30 of the second filter unit 200 can be connected to the liquid in the third equispaced flow channels 21 on the side of the second filter element 20 of the first filter unit 100 via the transition flow channel 24.

Advantageously, both ends of the second filtering member 20 are flush with the end surfaces of the second filtering channel 23, respectively, and since the first inner end cap 41 closes the second filtering channel 23, the first inner end cap 41 also closes the bottoms of the second filtering member 20 and the fourth uniformly distributed flow channels 22, and provides a bottom support for the second filtering member 20, so as to effectively prevent the liquid to be purified on both sides of the second filtering member 20 and the purified liquid from crossing each other at the bottom, and ensure the filtering effect of the second filtering member 20. Optionally, the first inner end cap 41 is provided with an inner flange extending into the fourth uniform flow channel 22, and the outer peripheral surface of the inner flange contacts with the inner peripheral surface of the second filter element 20. Alternatively, the outer periphery of the first inner end cap 41 is provided with a burring, the inner side face of which is in contact with the outer peripheral face of the second filter member 20. The inner flange and the outer flange are arranged in the same way, so that the liquid blocking effect of the first inner end cover 41 on the end surfaces of the fourth uniformly distributed flow passage 22 and the second filter piece 20 can be enhanced; and a foolproof fit of the first inner end cap 41 and the second filter member 20 can be formed, with easy assembly.

Specifically, the end face of the shaft end of the second filter member 20 is glued to the first inner end cap 41, which not only facilitates assembly, but also facilitates installation of the integrated 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, a first outer end cap 42 and a water path spacer 46 are provided in the first filter unit 100, the first outer end cap 42 is sealed on the end surface of the first filter channel 13 facing the second filter unit 200, the second uniform flow channel 12, and the water path spacer 46 is connected to the first outer end cap 42 and spaced between the second uniform flow channel 12 and the third uniform flow channel 21. As shown in fig. 2, the first outer end cap 42 closes the bottom of the first filter element 10 and the second uniform flow channel 12, and provides support for the first filter element 10, so as to effectively prevent the liquid to be purified and the liquid after purification on both sides of the first filter element 10 from crossing at the bottom, and ensure the filtering effect of the first filter element 10. The waterway spacer 46 can reliably separate the second uniform distribution flow channel 12 from the third uniform distribution flow channel 21, thereby avoiding series flow of the liquid in the first filtering piece 10 and the second filtering piece 20 and avoiding the water quality reduction in each uniform distribution flow channel.

Optionally, the waterway spacer 46 is integrally formed with the first outer end cap 42. The integrated forming is convenient for processing and manufacturing. After the integral forming, a gap is not easy to appear between the waterway spacer 46 and the first outer end cover 42, and the position is relatively stable. The integral forming is also convenient for assembly, and ensures that the third uniform distribution flow channel 21 and the second uniform distribution flow channel 12 are not easy to flow in series after long-term use. And the integral piece can play a good role in supporting the first filter member 10 and the second filter member 20. Alternatively, the first outer end cover 42 protrudes upward at the middle 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 flow channel 21 and the transition flow channel 24 are communicated, and the purification water channels 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 member 20 may flow to the third filter member 30 through the transition flow passage 24, and be filtered again by the third filter member 30; alternatively, the water filtered by the third filter member 30 may flow to the second filter member 20 through the transition flow path 24 and be filtered again by the second filter member 20. Optionally, a first outer end cap 42 separates the first filter unit 100 and the second filter unit 200 in the axial direction, and the first outer end cap 42 is provided with the transition flow passage 24 in the axial direction. The first outer end cap 42 initially separates the first, second and third filter members 10, 20, 30 in the axial direction and the transition flow path 24 therein provides a series relationship between the second and third filter members 20, 30. The external piping required for the connection between the second filter member 20 and the third filter member 30 is saved.

Alternatively, the outer periphery of the first outer end cap 42 is provided with a burring, the inner side face of which is in contact with the outer peripheral face of the first filter member 10. The outer flanging is sleeved outside the middle boss of the first outer end cover 42, and the outer flanging blocks 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 piece 10 can be enhanced; and a foolproof fit for the first filter 10 can be formed, with easy assembly.

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

Alternatively, the gap between the first inner end cap 41 and the first outer end cap 42 is smaller, the first inner end cap 41 contacts with the first outer end cap 42 when the first inner end cap is acted by a force towards the first outer end cap 42, and when the transition flow passage 24 is filled with water and pushes the first inner end cap 41 open, the gap is enlarged, and the water path circulation is more smooth. The design of the first inner end cap 41 as a suspension 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 equispaced flow passage 22 is greater than the water pressure at the transition flow passage 24, the first inner end cap 41 can temporarily seal the transition flow passage 24.

In some embodiments of the present invention, as shown in fig. 2, a second inner end cap 43 and a second outer end cap 44 are provided in the first filter unit 100, the second outer end cap 44 is sealed on the end surface of the first filter channel 13 far away from the second filter unit 200, and the second inner end cap 43 is sealed on the end surface of the second filter channel 23 far away from the second filter unit 200.

Here, the second inner end cap 43 closes the top of the second filter passage 23 and provides a top connection for the second filter element 20 and a direction for the third inlet/outlet 201, which effectively prevents the liquid to be purified on both sides of the second filter element 20 and the purified liquid from crossing at the top, further ensuring the filtering effect of the second filter element 20. The fluid filtered by the second filter assembly 20 is collected in the fourth uniform flow channel 22 and can be discharged from the third inlet/outlet 201.

Accordingly, the second outer end cap 44 closes the top of the first filtering channel 13 and the second uniform flow channel 12, and provides a connection for the first filtering element 10 in the first filtering channel 13, so as to separate the first inlet/outlet 101 and the second inlet/outlet 102, thereby effectively preventing the liquid to be purified and the liquid after purification on both sides of the first filtering element 10 from being mixed at the top, and further ensuring the filtering effect of the first filtering element 10.

Alternatively, the periphery of the second inner end cap 43 is provided with a downward flange whose inner side surface is in contact with the outer peripheral surface of the second filter member 20. The second inner end cap 43 is provided with an inner flange extending into the fourth equispaced flow channels 22, and the outer peripheral surface of the inner flange contacts the inner peripheral surface of the second filter member 20. The inner flange and the outer flange are each arranged the same, so that the connection between the second inner end cap 43 and the second filter element 20 is tighter, and the reliability of the connection is increased. And the liquid blocking effect of the second inner end cap 43 on the end face of the second filter member 20 can be enhanced, and the fool-proof fit of the second inner end cap 43 can be formed, so that the assembly is easy.

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

Advantageously, the second outer end cap 44 is fitted on the axial end face of the first filter element 10 remote from the transition flow duct 24 in order to block the first filter element 10.

Alternatively, the periphery of the second outer end cap 44 is provided with a downward flange, and the inner side face of the flange is in contact with the outer peripheral face of the first filter member 10. The arrangement of the flanging makes the connection between the second outer end cover 44 and the first filter element 10 tighter, and increases 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 piece 10 can be enhanced, and the fool-proof fit of the first filter piece 10 can be formed, so that the assembly is easy.

Specifically, 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 integrated core. Optionally, the first filter element 10 is sealingly attached to the second outer end cap 44 by a ring of hot melt adhesive.

Optionally, the second outer end cover 44 is sleeved outside the second inner end cover 43, a second middle end cover 45 is further sleeved between the second outer end cover 44 and the second inner end cover 43, and a flow path between the second middle end cover 45 and the second outer end cover 44 is communicated with the second inlet/outlet 102. The second middle end cover 45 further seals the upper part of the first filter unit 100, further separates the second uniform flow channels 12 from the third uniform flow channels 21, and is also beneficial to the separation of the second inlet/outlet 102 and the third inlet/outlet 201.

The second middle end cover 45 is arranged, the second middle end cover 45 and the waterway spacer cylinder 46 are not integrally formed, on one hand, mold opening is facilitated, on the other hand, assembly is needed, and the reliability of overall assembly is improved.

In the embodiment of the present invention, the second middle end cover 45 may not be provided, so that the waterway spacer 46 may be directly connected to the second inner end cover 43, thereby saving the number of parts. However, since the second filter member 20 is assembled to the inner side of the waterway spacer 46, the waterway spacer 46 cannot be installed if the opening is small, and the assembly of the second outer end cap 44 and the first filter member 10 is affected if the opening of the waterway spacer 46 is large, which increases the difficulty of the whole assembly.

Therefore, the second middle end cover 45 is provided, when in assembly, the second filter piece 20 and other parts are firstly arranged in the waterway spacer cylinder 46, and then the second middle end cover 45 is connected to the waterway spacer cylinder 46, so that the assembly requirement is met, and the reliability of the whole assembly is improved. On the other hand, when the waterway spacer 46 and the first outer end cap 42 are integrally formed, they can be manufactured by an integral injection molding method, and at this time, the second middle end cap 45 should not be integrally injection molded for convenience of mold opening.

Optionally, the tops of the second middle end cap 45, the second inner end cap 43 and the second outer end cap 44 are flush. The cover sealing of the housing upper cover 310 to the first filter unit 100 is facilitated, and the assembly is convenient.

In the example of fig. 2, the small distance between the second center end cap 45 and the second outer end cap 44 allows for a delicate balancing of the water pressure as it passes through the first filter element 10. That is, when the water pressure inside the waterway spacer 46 is higher than the water pressure outside, the second middle cap 45 may be pressed against the second outer cap 44, and the filtering speed of the first filter element 10 is slowed down. During normal operation, the water pushes the second middle end cover 45 open and flows normally toward the second inlet/outlet 102.

In some embodiments, all of the components of first filter unit 100 are pre-assembled into a single piece, i.e., first filter element 10, second filter element 20, first inner end cap 41, first outer end cap 42, second inner end cap 43, second outer end cap 44, and second middle end cap 45 are pre-joined into a front-to-back integrated filter cartridge. Even the sealing ring, can be preassembled.

The front-rear integrated filter element can be directly inserted between the partition plate in the shell 300 and the shell upper cover 310 during assembly, and the whole assembly process is greatly simplified. And if casing upper cover 310 can dismantle the connection on the bottle, that user's back after using, also can change front and back integrated filter core by oneself, the operating procedure when user oneself changes is also very easy moreover, has improved user's the experience of changing the core, has reduced and has changed the core cost.

In some embodiments of the present invention, as shown in fig. 2, 5, 6, 7, 8, 9, the flow channel structure of the composite filter element assembly 1000 further comprises: a third end cap 47 and a fourth end cap 48, the third end cap 47 sealing the third filter passage 32 and the end of the waste water passing chamber facing the first filter unit 100, the fourth end cap 48 sealing the third filter passage 32 and the end of the filtered water passing chamber facing away from the first filter unit 100. Third and fourth end caps 47 and 48 provide a positive mounting for third filter element 30, as well as center tube 33 and waste header 34.

Here, the third end cap 47 closes the top of the third filter element 30 and the waste water flow chamber and provides a top connection for the third filter element 30, effectively preventing the liquid to be purified and the purified liquid on both sides of the third filter element 30 from coming together at the top; the fourth end cap 48 closes the bottom of the third filter element 30 and the filtered water flow chamber and provides a bottom seal and support for the third filter element 30, thereby effectively preventing the liquid to be purified and the purified liquid on both sides of the third filter element 30 from coming together at the bottom and ensuring the filtering effect of the third filter element 30.

Specifically, as shown in fig. 2, 5, 6, and 7, the third end cap 47 has a second insertion tube 471 and a third insertion tube 472 at two ends thereof, the second insertion tube 471 is inserted into the transition flow channel 24, and the third insertion tube 472 is connected to the central tube 33. Here, the third end cap 47 closes the top of the third filter element 30 and provides a top support connection for the third filter element 30, effectively preventing the liquid to be purified and the purified liquid on both sides of the third filter element 30 from bunching at the top.

The third end cap 47 is inserted into the transition flow channel 24 through the second insertion tube 471, so that on one hand, sealing is facilitated, high-pressure water in the second filter unit 200 is prevented from flowing to the transition flow channel 24 without being filtered by the third filter element 30, on the other hand, the transition flow channel 24 is used for positioning, positioning accuracy is improved, and meanwhile assembly difficulty can be reduced.

The third end cap 47 is inserted into the central tube 33 through the third insertion tube 472, so that on one hand, the sealing is realized by using the surface contact between the third insertion tube 472 and the tube wall of the central tube 33, 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 inclined and leaking water after long-term use.

In addition, as shown in fig. 7, the third end cap 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 into the first positioning protrusion 473, and the first positioning protrusion 473 has a certain fool-proof matching function, so that the third end cap 47 and the waste water header 34 can be conveniently positioned and installed, and the waste water header 34 can be prevented from being inclined after long-term use.

Optionally, as shown in fig. 6 and 7, the peripheral wall of the third end cap 47 is provided with first assembling and positioning structures 474, the first assembling and positioning structures 474 are circumferentially spaced apart, and the first assembling and positioning structures 474 abut against the inner wall of the housing 300, so that the alignment degree of the third filter element 30 in the second filter unit 200 is improved, and the third filter element 30 is prevented from being tilted integrally to cause poor fitting at the transition flow passage 24.

Advantageously, a sealing ring is provided between the second cannula 471 and the transition flow channel 24.

Specifically, as shown in fig. 8 and 9, the fourth end cap 48 is provided with a fourth insertion tube 481, and the fourth end cap 48 is provided with a waste discharge port 482 connected to the waste water header 34 and the fifth inlet/outlet 301, respectively.

In addition, as shown in fig. 9, the middle part of the fourth end cover 48 protrudes and is provided with a second positioning protrusion 483, the second positioning protrusion 483 corresponds 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 fool-proof matching function, so that the fourth end cover 48 and the central tube 33 are conveniently positioned and installed, the central tube 33 is prevented from being inclined in long-term use, the lower part of the central tube 33 can be sealed, and liquid in the central tube 33 is prevented from flowing out.

Optionally, as shown in fig. 8 and 9, a second assembling and positioning structure 484 is provided on a peripheral wall of the fourth end cover 48, the second assembling and positioning structures 484 are arranged at intervals along the circumferential direction, and the second assembling and positioning structures 484 abut against the inner wall of the housing 300, so that the alignment degree of the third filter element 30 in the second filter unit 200 is improved, and the third filter element 30 is prevented from being tilted integrally to cause that the third filter element cannot be well fitted at the connecting pipe connected with the fifth inlet/outlet 301.

To better understand the aspects of the embodiments of the present invention, the flow channel structure of the composite filter element assembly 1000 in one embodiment of the present invention is described below in conjunction with fig. 1-12.

The following embodiments describe the three-stage filtering function of the composite filter element assembly 1000 by taking purified tap water as an example, and describe a highly integrated design structure of the composite filter element assembly 1000. In addition, the first filter member 10 is explained as an example of the primary filter member; the third filter member 30 will be described as an example of intermediate filtration. The second filter member 20 is explained as an example of final stage filtration.

As shown in fig. 1 and 2, a flow channel structure of a composite filter element assembly 1000 is provided in a vertical state in a normal state of the composite filter element assembly 1000. The filter comprises a shell 300, and a first filter unit 100 and a second filter unit 200 which are arranged in the shell 300 at intervals along the axial direction, wherein a transition flow passage 24 is arranged between the first filter unit 100 and the second filter unit 200 for communication.

The first filtering unit 100 is internally provided with a first uniform distribution flow channel 11, a first filtering channel 13, a second uniform distribution flow channel 12, a third uniform distribution flow channel 21, a second filtering channel 23 and a fourth uniform distribution flow channel 22 which are arranged in a stacked manner from outside to inside along the radial direction. A roll-type first filter member 10 formed by rolling a non-woven fabric, a polypropylene layer, carbon fibers and a spacing bracket 49 is arranged in the first filter passage 13. The first filter element 10 is used as a primary filter unit for tap water, and the spacing bracket 49 is arranged in the second uniformly distributed flow passage 12.

As shown in fig. 2, the first uniform flow passage 11 is communicated with the second uniform flow passage 12 through the first filtering channel 13, the first uniform flow passage 11 is connected to a first inlet/outlet 101 of raw tap water, the second uniform flow passage 12 is connected to a second inlet/outlet 102, and the pre-water filtered by the first filtering member 10 flows out from the second inlet/outlet 102.

As shown in fig. 2, a hollow carbon rod is provided as the second filter member 20 in the second filter passage 23. The second filter 20 serves as a final filter unit before the drinking water is discharged. The third uniform flow passage 21 and the fourth uniform flow passage 22 are communicated through a second filtering passage 23. The third uniform flow passage 21 is connected with the transition flow passage 24, the fourth uniform flow passage 22 is connected with the third inlet and outlet 201, and the third inlet and outlet 201 is used as the final outlet of the drinking water.

The second equispaced flow passages 12 and the third equispaced flow passages 21 are separated by a water passage spacer cylinder 46. A first inner end cover 41, a first outer end cover 42, a second middle end cover 45, a second inner end cover 43 and a second outer end cover 44 are arranged in the first filter unit 100, and the first inner end cover 41 is sealed on the end faces, facing the second filter unit 200, of the second filter channel 23 and the fourth uniform flow channel 22. The first outer end cover 42 is sealed on the end faces of the first filtering channel 13 and the second uniform flow channel 12 facing the second filtering unit 200. A gap is formed between the bottom of the first inner end cap 41 and the top of the first outer end cap 42. The first outer end cap 42 is connected to the bottom of the waterway spacer 46 and is integrally formed therewith. Second outer end cap 44 seals against the end face of first filter channel 13 remote from second filter element 200, and second inner end cap 43 seals against the end face of second filter channel 23 remote from second filter element 200. A second middle end cover 45 is sleeved between the second outer end cover 44 and the second inner end cover 43, and a flow path between the second middle end cover 45 and the second outer end cover 44 is communicated with the second inlet and outlet 102.

As shown in fig. 2, 3 and 4, the second filter unit 200 is provided with a third filter member 30 formed of a side flow reverse osmosis membrane module, and the third filter member 30 serves as an intermediate filter before the carbon filter. The second filtering unit 200 is internally provided with a fifth uniform distribution flow channel 31 and a third filtering channel 32 from outside to inside along the radial direction, the third filtering channel 32 is arranged around a filtered water circulation cavity and a waste water circulation cavity, a third filtering piece 30 is arranged in the third filtering channel 32, the waste water circulation cavity is communicated with the fifth uniform distribution flow channel 31 through the third filtering channel 32, the waste water circulation cavity is also communicated with a waste water collecting pipe 34 in the reverse osmosis membrane module, the fifth uniform distribution flow channel 31 is communicated with a fourth inlet and outlet 302, the fourth inlet and outlet 302 is communicated with the second inlet and outlet 102 through an external pipeline, and before the preposed water enters the fourth inlet and outlet 302, pressurization is needed. A filtered water circulation cavity and a waste water circulation cavity are arranged in the second filtering unit 200, a filtering membrane 35 is arranged between the filtered water circulation cavity and the waste water circulation cavity, the filtered water circulation cavity is communicated with the transition flow channel 24, the transition flow channel 24 is communicated with the central pipe 33 of the reverse osmosis membrane assembly, the waste water circulation cavity is communicated with the fifth inlet and outlet 301, and the fifth inlet and outlet 301 is used as a waste water outlet of the reverse osmosis membrane assembly after the front water is purified.

As shown in fig. 5, 6, 7, 8 and 9, a third end cap 47 and a fourth end cap 48 are provided in the second filter unit 200. A third end cap 47 is sealed to the third filter passage 32 and the end of the waste water passing chamber facing the first filter unit 100, and a fourth end cap 48 is sealed to the third filter passage 32 and the end of the filtered water passing chamber facing away from the first filter unit 100. Five waste water collecting pipes 34 are erected between the third end cover 47 and the fourth end cover 48, the middle part of the fourth end cover 48 supports the bottom end of the central pipe 33, the middle part of the third end cover 47 is provided with a through hole, a second inserting pipe 471 and a third inserting pipe 472 which are mutually nested are arranged in the through hole, the top end of the central pipe 33 is connected with the third inserting pipe 472, and the second inserting pipe 471 is connected with the transition flow channel 24.

Here, the first filtering unit 100 is a low pressure portion, and the water pressure of the inner uniform flow passage and the filtering passage is low. And the second filtering unit 200 is a high pressure part, and the water pressure of the flow channels and the filtering channels uniformly distributed in the second filtering unit is higher. The water discharged from the second inlet/outlet 102 is pumped and then flows to the fourth inlet/outlet 302.

The whole process of filtering the tap water is that the tap water enters the first uniform flow channel 11 from the first inlet/outlet 101, flows to the radial inner side, flows to the second uniform flow channel 12 after being filtered by the first filter element 10, and flows out as the front water from the second inlet/outlet 102 at the upper part. The effluent pre-water is pressurized and pumped into the fourth inlet/outlet 302, and is uniformly distributed in the fifth uniform flow channels 31, flows in from the side direction of the side flow reverse osmosis water-saving film and is filtered by the third filtering element 30, the high salinity wastewater is collected by the wastewater header 34 and is discharged from the fifth inlet/outlet 301, and the pure water is collected upwards by the central pipe 33 and passes through the transition flow channel 24. The pure water enters the third uniform flow passage 21 from the transition flow passage 24, is filtered by the second filtering piece 20, enters the fourth uniform flow passage 22 and flows out from the third inlet and outlet 201 for drinking.

In the description of the present invention, it is to be understood that the terms "central," "upper," "lower," "front," "rear," "top," "bottom," "inner," "outer," "axial," "radial," "vertical," and the like are used in the positional or orientational relationships indicated in the drawings to facilitate the description of the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and therefore should not be construed as limiting the invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Other configurations of the flow channel structure of the composite filter element assembly 1000 according to embodiments of the present invention, such as the filtering function of each filter element, the selection of the material of each filter element, are known to those of ordinary skill in the art and will not be described in detail herein.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean 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 invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. 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 invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. A flow channel structure for a composite filter element assembly, comprising: the filter comprises a first filter unit and a second filter unit which are arranged at intervals along the axial direction, wherein the first filter unit is provided with a first inlet and outlet, a second inlet and outlet and a third inlet and outlet, the second filter unit is provided with a fourth inlet and outlet, a transition flow passage is arranged between the first filter unit and the second filter unit, wherein,

a first uniform distribution flow passage, a first filtering channel, a second uniform distribution flow passage, a third uniform distribution flow passage, a second filtering channel and a fourth uniform distribution flow passage are sequentially arranged in the first filtering unit from outside to inside along the radial direction, a first filtering piece is arranged in the first filtering channel, a second filtering piece is arranged in the second filtering channel, the first uniform distribution flow passage is communicated with the second uniform distribution flow passage through the first filtering passage, the third uniform distribution flow passage is communicated with the fourth uniform distribution flow passage through the second filtering passage, the second uniform distribution flow channel and the third uniform distribution flow channel are isolated and do not flow, the first uniform distribution flow channel is connected with the first inlet and the first outlet, the second uniform distribution flow channel is connected with the second inlet and the second outlet, one of the third uniform distribution flow channel and the fourth uniform distribution flow channel is connected with the third inlet and the third outlet, the other of the third uniform distribution flow channel and the fourth uniform distribution flow channel is connected with the transition flow channel;

and a third filtering piece is arranged in the second filtering unit.

2. The flow channel structure of the composite filter element assembly of claim 1, wherein the second filter unit has a fifth inlet and a fifth outlet, a filtered water flow chamber and a waste water flow chamber are arranged in the second filter unit, a filter membrane is arranged between the filtered water flow chamber and the waste water flow chamber, the filtered water flow chamber is communicated with the transition flow channel, and the waste water flow chamber is communicated with the fifth inlet and the fifth outlet.

3. The flow channel structure of the composite filter element assembly according to claim 2, wherein a fifth uniform flow channel and a third filter channel are sequentially arranged in the second filter unit from outside to inside in the radial direction, the third filter channel is arranged around the filtered water flow cavity and the waste water flow cavity, the third filter element is arranged in the third filter channel,

the wastewater circulation cavity is communicated with the fifth uniform distribution flow channels through the third filtering channel, and the fifth uniform distribution flow channels are communicated with the fourth inlet and the fourth outlet.

4. The flow channel structure of a composite filter element assembly according to claim 1, wherein the fourth uniform flow channel is cylindrical, and the first uniform flow channel, the first filtering channel, the second uniform flow channel, the third uniform flow channel and the second filtering channel are annular and are sequentially sleeved.

5. The flow channel structure of a composite filter element assembly according to claim 1, wherein a first inner end cap is provided in the first filter unit, the first inner end cap seals the end surfaces of the second filter channel and the fourth uniform flow channel facing the second filter unit, and the transition flow channel is connected to the third uniform flow channel.

6. The flow channel structure of the composite filter element assembly according to claim 1, wherein a first outer end cover and a water channel spacer are arranged in the first filter unit, the first outer end cover is sealed on the end faces, facing the second filter unit, of the first filter channel and the second uniform flow channel, and the water channel spacer is connected with the first outer end cover and is spaced between the second uniform flow channel and the third uniform flow channel.

7. The flow channel structure of a composite filter element assembly according to claim 1, wherein a second inner end cap and a second outer end cap are provided in the first filter element, the second outer end cap is sealed to the end surface of the first filter channel far from the second filter element, and the second inner end cap is sealed to the end surface of the second filter channel far from the second filter element.

8. The composite filter element assembly flow channel structure of claim 3, further comprising: the third end cover is sealed at one end of the third filtering channel and the waste water circulation cavity facing the first filtering unit, and the fourth end cover is sealed at one end of the third filtering channel and the filtered water circulation cavity far away from the first filtering unit.

9. The flow channel structure of the composite filter element assembly as claimed in claim 2, wherein a central tube and a plurality of waste water collecting tubes are arranged in the second filtering unit, the plurality of waste water collecting tubes are arranged around the central tube, the filtering membrane is a reverse osmosis membrane bag, the reverse osmosis membrane bag has a first portion and a second portion, each of the waste water collecting tube and the central tube is separated by the first portion of at least one of the reverse osmosis membrane bags, the second portion of the plurality of reverse osmosis membrane bags forms a multi-layer membrane assembly surrounding the central tube group, a plurality of cylinders formed by rolling the reverse osmosis membrane bags form the third filtering element, the central tube is communicated with the transition flow channel, a filtered water inlet hole is arranged on the wall of the central tube, and the waste water collecting tubes are communicated with the fifth inlet and outlet, and a waste water inlet hole is arranged on the wall of.

10. The flow channel structure of a composite filter element assembly according to claim 1, wherein a spacer is provided in said first filter unit, said spacer being provided in said second equispaced flow channels.

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