CN111115879A

CN111115879A - Water purification system

Info

Publication number: CN111115879A
Application number: CN201811291171.9A
Authority: CN
Inventors: 桂鹏; 李杨敏; 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: 2020-05-08

Abstract

The invention discloses a water purification system, comprising: the device comprises a composite filter element assembly, a water inlet pipe, a pure water pipe, a conversion pipe and a booster pump. The composite filter element assembly is provided with a first filter unit and a second filter unit at intervals along the axial direction and is communicated by a transition flow passage. The first filtering unit has an inlet connected with the water inlet pipe, two outlets respectively connected with the starting end of the switching pipe and the starting end of the pure water pipe, and the second filtering unit has an inlet connected with the terminal end of the switching pipe. Wherein, two annular uniform distribution runners communicated by a first filtering channel and an annular and cylindrical uniform distribution runner 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 runner and the third uniform distribution runner is absolutely not communicated. A third filter element is arranged in the second filter unit. The booster pump is connected in series to the transfer pipe. The water purification system has the advantages of simplified pipeline structure and high operation reliability.

Description

Water purification system

Technical Field

The invention belongs to the technical field of water purification, and particularly relates to a water purification system.

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 water inlet flow way respectively, the water outlet flow 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 water outlet flow way and the water inlet flow way between the different filter element group spares, 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, the junction of outside pipeline takes place easily to leak, holistic water yield that can purify has great. In addition, each pipeline of a water purification system formed by the water purifier filter elements is complex in arrangement, and each stage of filter units are poor in reliability and low in control precision through external pipeline connection.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a water purification system which is simplified in design, stable and reliable, long in service life and high in pure water recovery rate.

A water purification system according to an embodiment of the present invention includes: composite filter element assembly, be provided with first filter unit and second filter unit along axial interval in composite filter element assembly's the casing, first filter unit has first import and export, second import and export and third import and export, the second filter unit has the fourth import and export, be equipped with the transition runner between first filter unit and the second filter unit, wherein, first equipartition runner, first filtration passageway, second equipartition runner, third equipartition runner, second filtration passageway and fourth equipartition runner have set gradually in the first filter unit, be equipped with first filter piece in the first filtration passageway, be equipped with second filter piece in the second filtration passageway, first equipartition runner with the second equipartition runner passes through first filtration passageway intercommunication, third equipartition runner with the fourth equipartition runner passes through second filtration passageway intercommunication, 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 outlet, 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, 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; a water inlet pipe connected to the first inlet and outlet of the composite filter element assembly; the pure water pipe is connected with the third inlet and outlet of the composite filter element assembly; the conversion pipe is respectively connected with the second inlet and the fourth outlet; and the booster pump is connected in series to the conversion pipe.

According to the water purification system disclosed by the embodiment of the invention, the first filtering unit and the second filtering unit are arranged at intervals in the axial direction and are connected by the transition flow channel, the two filtering units are compactly matched, an external connecting pipeline communicated between the third filtering piece and the second filtering piece is saved, the number of external pipelines is saved, and the simplicity of arrangement and the reliability of operation of the whole water purification system are improved. Each pipeline is relatively centralized in arrangement and easy to arrange. Four uniform distribution runners and two channels are sequentially arranged in the first filtering unit, and one filtering piece is respectively arranged in the two channels, so that the integral structure in the first filtering unit is compact, and two filtering functions are integrated. 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 third filtering piece is arranged in the second filtering unit, so that the overall filtering function of the water purifying system can be further increased, and the quality of final effluent is improved. Through each pipe connection of water purification system, the raw water that gets into water purification system firstly filters the piece preliminary purification through first filter of first filter unit, then gets into the second filter unit and filters, later gets back to first filter unit again and filters by the second filter. Wherein, will pass through the booster pump pressure boost before getting into the second filter unit, make rivers can high pressure pass through the third and filter the piece, improve filtration efficiency. And compound filter element group spare so sets up, will can the ordinary pressure filter or low pressure filterable filter piece concentrate on first filter unit in, will need high pressure filterable filter piece concentrate on the second filter unit in, separately set up the two, each part of first filter unit is connected and can be assembled according to the ordinary pressure requirement, avoids assembly cost too high, and each part of second filter unit is connected and is assembled according to the high-pressure requirement.

The water purification system according to an embodiment of the present invention further includes: and the conversion control valve is connected to the conversion pipe in series.

According to a further embodiment of the present invention, further comprising: and the high-voltage switch is connected in series with the pure water pipe and is electrically connected with the conversion control valve.

The water purification system according to an embodiment of the present invention further includes: the check valve is connected in series with the pure water pipe.

According to the water purification system of one embodiment of the invention, the second filter unit is provided with a fifth inlet and a fifth outlet, a filtered water circulation cavity and a waste water circulation cavity are arranged in the second filter unit, a 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, further comprising: a waste pipe connected to the fifth inlet/outlet of the composite filter element assembly; the waste water valve is connected in series to the waste water pipe.

According to a further embodiment of the invention, the waste valve is an adjustable waste valve, which is an accumulation mode flush or a standby flush.

According to the water purification system of one embodiment of the present invention, the first filter member is a roll made of non-woven fabric, polypropylene layer, or carbon fiber, and the second filter member is a carbon cartridge.

According to the water purifying system disclosed by the embodiment of the invention, the first filter element is sleeved outside the second filter element, the first filter element and the second filter element are separated by the water path spacing cylinder, the first uniform flow channel is formed on the outer peripheral side of the first filter element, the second uniform flow channel is defined between the first filter element and the water path spacing cylinder, the third uniform flow channel is defined between the second filter element and the water path spacing cylinder, and the fourth uniform flow channel is formed by an inner cavity surrounded by the second filter element.

According to a water purification system of an embodiment of the present invention, the second filtering unit includes: a reverse osmosis membrane element, the reverse osmosis membrane element comprising: the reverse osmosis membrane water purifier comprises a central pipe group and a plurality of reverse osmosis membrane bags, wherein the central pipe group comprises a central pipe and a plurality of waste water pipes arranged at intervals, the plurality of waste water pipes are arranged around the central pipe, the pipe wall of the central pipe is provided with filtered water inlet holes, and the pipe wall of each waste water pipe is provided with a waste water inlet hole; said reverse osmosis membrane bags having a first portion located inside said central tube bank and a second portion located outside said central tube bank, each said waste and said central tube being separated by at least a first portion of said reverse osmosis membrane bags, said second portions of a plurality of said reverse osmosis membrane bags forming a multi-layer membrane module around the circumference of said central tube bank; the water entering the high-pressure cavity from the fourth inlet and outlet flows to the filtered water inlet hole after being filtered by the reverse osmosis membrane bag, the pipe cavity of the central pipe forms the filtered water circulation cavity, the pipe cavity of the waste water pipe forms the waste water circulation cavity, and the reverse osmosis membrane bag forms the filtering membrane.

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 view of the general structure of a water purification system according to an embodiment of the present invention.

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

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

Fig. 4 is a 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;

a water purification system 2000;

a water inlet pipe 400;

a pure water pipe 500; a high voltage switch 510; a check valve 520;

a waste pipe 600; a waste valve 610;

a transition tube 700; a booster pump 710; a switching control valve 720;

a faucet 900.

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 structure of a composite filter element assembly 1000 according to an embodiment of the present invention is described below with reference to fig. 2-12.

According to the composite filter element assembly 1000 of the embodiment of the invention, as shown in fig. 2, a first filter unit 100 and a second filter unit 200 which are arranged at intervals along the axial direction are arranged in a shell 300 of the composite filter element assembly 1000.

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 other examples of the present invention, as shown in fig. 1, the housing 300 of the composite filter element assembly 1000 is open at two ends, and the housing 300 is provided with an upper housing cover 310 and a lower housing cover 320 at two ends. 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 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.

A water purification system 2000 of an embodiment of the present invention is described below with reference to fig. 1.

A water purification system 2000 according to an embodiment of the present invention comprises: a composite filter element assembly 1000, a water inlet pipe 400, a pure water pipe 500, a conversion pipe 700 and a booster pump 710.

The structure of the composite filter element assembly 1000 is described in detail at the front and will not be described further.

As shown in fig. 1, the inlet conduit 400 is connected to the first inlet/outlet 101 of the composite cartridge assembly 1000. Here, the tap water to be purified (or raw water from other water sources) may be introduced into the composite filter element assembly 1000 through the water inlet pipe 400, and the first filter member 10 will primarily filter the tap water.

The pure water pipe 500 is connected to the third inlet/outlet port 201 of the composite filter element assembly 1000. Here, the pure water after multi-stage filtration by the composite filter element assembly 1000 can be led out from the pure water pipe 500.

The switching tube 700 is connected to the second inlet/outlet 102 and the fourth inlet/outlet 302, respectively, and the booster pump 710 is connected in series to the switching tube 700. The switching tube 700 communicates with the flow passage between the first filter element 10 and the third filter element 20, so that the pre-discharged water filtered by the first filter element 10 enters the fifth uniformly distributed flow passage 31 of the third filter element 20. After being pressurized by the booster pump 710, the water enters the third filtering piece 20 for filtering, so that the filtering speed can be increased, and the filtering efficiency can be improved. When the third filter element 20 adopts a reverse osmosis membrane module or an ultrafiltration membrane module, the conversion of the pre-effluent with low ion concentration into wastewater with high ion concentration and pure water can be completed.

It can be understood that, in the present invention, the first filter unit 100 and the second filter unit 200 are axially spaced apart and connected by the transition flow passage 24, and the two filter units are compactly matched, and the transition flow passage 24 replaces an external connection pipeline required for communication between the third filter element 30 and the second filter element 20, that is, an external water inlet connection pipeline of the second filter element 20 and an external water outlet connection pipeline of the third filter element 30 are saved, so that the number and arrangement difficulty of the external pipelines of the water purification system 2000 are integrally saved, the simplicity of the overall design of the water purification system 2000 is increased, and the reliability of the operation of the water purification system 2000 is increased.

Compared with the arrangement mode that the three filter elements are respectively arranged in the respective filter element shells and the three filter element shells are respectively communicated by using the external pipelines, the water purification system 2000 greatly reduces the overall arrangement space, saves the arrangement of the external pipelines, and is more concentrated and easy to arrange the external pipelines arranged in the system.

Through the pipe connections of the water purification system 2000, the raw water entering the water purification system 2000 is primarily purified by the first filter element 10 of the first filter unit 100, then enters the second filter unit 200 for filtration, and then returns to the first filter unit 100 for filtration by the second filter element 20. Wherein, before entering the second filtering unit 200, the water is pressurized by the pressurizing pump 710, so that the water can pass through the third filtering member 30 at high pressure, thereby improving the filtering efficiency. The composite filter element assembly 1000 is arranged in such a way that the filter elements (the first filter element 10 and the second filter element 20) which can perform normal pressure filtration or low pressure filtration are concentrated in the first filter unit 100, the filter elements (the third filter element 30) which need high pressure filtration are concentrated in the second filter unit 200, and the two filter elements are separately arranged, the connection of each part of the first filter unit 100 can be assembled according to the normal pressure requirement, the excessive assembly cost is avoided, and the connection of each part of the second filter unit 200 is assembled according to the high pressure requirement.

In some embodiments of the present invention, as shown in fig. 1, the water purification system 2000 further comprises: the control valve 720 is switched. The switching control valve 720 is connected in series to the switching pipe 700, and the switching control valve 720 controls the flow and cut-off of the water in the switching pipe 700. The system is judged by blocking the flow of water flow on the switching pipe 700, and the switching control valve 720 is close to the booster pump 710, so that the water flow in the booster pump 710 is no longer ensured during judgment, and the booster pump 710 is protected. And also, the switching control valve 720 is provided in the switching pipe 700 to control the entire system due to the fact that the water pressure of the second filtering unit 200 is higher than that of the first filtering unit 100, and the reverse flow of the water flow in the second filtering unit 200 along the switching pipe 700 can be prevented.

In some examples of the invention, the water purification system 2000 further comprises: the high-voltage switch 510 is connected in series with the pure water pipe 500, and the high-voltage switch 510 is electrically connected with the conversion control valve 720. The high-voltage switch 510 is disposed on the pure water pipe 500, and when the pressure at the pure water outlet is detected to be higher than a preset value, the switching control valve 720 is closed, so that the composite filter element assembly 1000 stops purifying water. The high-pressure switch 510 is electrically connected to the switching control valve 720, and can control the switching control valve 720 to open and close, so as to keep the water pressure in the water outlet pipe 500 and the switching pipe 700 stable, and to coordinate the operation of each water channel in the whole water purification system 2000.

Optionally, as shown in fig. 1, the water purification system 2000 further comprises: a check valve 520 connected in series to the plain water pipe 500. The check valve 520 ensures that the filtered drinking water from the second filter 20 flows to the final water using end without flowing backward, so that the water purifying system 2000 operates stably and reliably.

Optionally, the pure water pipe 500 is connected at its end to a tap 900 for the user to use the drinking water, so that the user can directly use the high-quality pure water.

In some embodiments of the present invention, as shown in fig. 1, the water purification system 2000 further comprises: a waste 600 and a waste valve 610. The waste water pipe 600 is connected with the fifth inlet and outlet 301 of the composite filter element assembly 1000, and the waste water valve 610 is connected in series with the waste water pipe 600. The waste water valve 610 is opened to control the high-salt waste water in the third filtering unit 30 to be discharged outwards, so that the normal operation of the third filtering unit 30 is ensured.

Optionally, the waste valve 610 is an adjustable waste valve.

In some examples, the waste valve 610 is a progressive flush. That is, when the waste liquid is accumulated to a certain amount, the control system controls the waste water valve 610 to open once.

In some examples, the waste valve 610 is standby to flush.

The adjustable waste valve ensures that the waste valve 610 itself is not blocked while ensuring the life of the third filter element 30. After the third filter member 30 works for a period of time, a certain amount of waste water is accumulated, the waste water valve 610 is opened to discharge the liquid, the waste water is prevented from being accumulated on the surface of the third filter member 30 for a long time to damage the third filter member 30, the overall utilization rate of the third filter member 30 is improved, and the flow speed of filtered water is increased; the corrosion of the high-salinity wastewater to the wastewater valve 610 is reduced, and the service life of the wastewater valve 610 is prolonged.

To better understand the solution of the embodiment of the present invention, the structure of the water purification system 2000 in an embodiment of the present invention will be described below with reference to fig. 1 to 12.

The water purification system 2000 comprises a composite filter element assembly 1000, a water inlet pipe 400, a pure water pipe 500, a high-pressure switch 510, a one-way valve 520, a waste water pipe 600, a waste water valve 610, a conversion pipe 700, a booster pump 710, a conversion control valve 720 and a water tap 900.

As shown in fig. 1 and 2, the composite filter element assembly 1000 is installed in a vertical state in a normal state. 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, 9, 10, 11, and 12, 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.

As shown in fig. 1 and 2, the upper housing cover 310 of the composite filter element assembly 1000 is provided with a first inlet/outlet 101 for water, and the first inlet/outlet 101 is connected to a water inlet pipe 400 for water.

The upper cover 310 of the housing of the composite filter element assembly 1000 is provided with a third inlet/outlet port 201 capable of discharging high-quality pure water, and the third inlet/outlet port 201 is connected with one end of the pure water pipe 500. The pure water pipe 500 near the third inlet/outlet 201 is provided with a one-way valve 520, the pure water pipe 500 is further provided with a high-pressure switch 510, and the tail end of the pure water pipe 500 is communicated with a water tap 900 for water outlet.

The upper cover 310 of the housing of the composite filter element assembly 1000 is provided with a second inlet/outlet 102 for discharging the pre-positioned water, and the second inlet/outlet 102 is connected with one end of the transition pipe 700.

The lower cover 320 of the housing of the composite filter element assembly 1000 is provided with a fourth inlet/outlet 302 for the reverse osmosis preposed water, and the fourth inlet/outlet 302 is connected with the other end of the conversion pipe 700. The switching pipe 700 is provided in series with a booster pump 710 and a switching control valve 720, and the switching control valve 720 is located at one end near the second inlet/outlet 102. The high pressure switch 510 is electrically connected to the switching control valve 720.

The shell lower cover 320 of the composite filter element assembly 1000 is provided with a fifth inlet and outlet 301 capable of discharging high salinity wastewater during reverse osmosis filtration, one end of the fifth inlet and outlet is communicated with a wastewater pipe 600, and the wastewater pipe 600 is provided with a wastewater valve 610. Wherein the waste valve 610 is an adjustable waste valve that integrates flush.

The whole tap water filtering process is to keep the conversion control valve 720, the booster pump 710, the one-way valve 520 and the high-pressure switch 510 open. Tap water enters from the water inlet pipe 400, enters the first uniform flow channel 11 through the first inlet/outlet 101, flows radially inward, is filtered by the first filter element 10 (a roll-type primary filter element formed by rolling a non-woven fabric, a polypropylene layer, carbon fibers and a spacing bracket 49), flows to the second uniform flow channel 12, and flows out as front water from the second inlet/outlet 102 at the upper part to enter the conversion pipe 700.

The effluent pre-water is pressurized and pumped into the fourth inlet/outlet 302, uniformly distributed in the fifth uniformly-distributed flow channels 31, flows into the third filter element 30 (lateral flow reverse osmosis water-saving film) from the side surface in the circumferential direction and is filtered by the third filter element 30, the high-salinity wastewater is collected by the wastewater header 34 and is discharged into the wastewater pipe 600 from the fifth inlet/outlet 301, and after a certain time or amount of wastewater is accumulated, the wastewater valve 610 is opened for one-time liquid discharge. Pure water is collected by the center tube 33 up through the transition ports 332. Pure water enters the third uniform flow channel 21 from the transition port 332, is filtered by the second filter element 20 (carbon cartridge), enters the fourth uniform flow channel 22, flows out of the third inlet/outlet port 201 onto the pure water pipe 500, passes through the one-way valve 520 and then flows out of the faucet 900 for drinking by a user.

In the description of the present invention, it is to be understood that the terms "center", "length", "width", "up", "down", "front", "back", "vertical", "top", "bottom", "inner", "outer", "axial", "radial", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present 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.

In the description herein, references to the description of "one embodiment," "some embodiments," "an example," "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

1. A water purification system, comprising:

composite filter element assembly, be provided with first filter unit and second filter unit along axial interval in composite filter element assembly's the casing, first filter unit has first import and export, second import and export and third import and export, the second filter unit has the fourth import and export, be equipped with the transition runner between first filter unit and the second filter unit, wherein, first equipartition runner, first filtration passageway, second equipartition runner, third equipartition runner, second filtration passageway and fourth equipartition runner have set gradually in the first filter unit, be equipped with first filter piece in the first filtration passageway, be equipped with second filter piece in the second filtration passageway, first equipartition runner with the second equipartition runner passes through first filtration passageway intercommunication, third equipartition runner with the fourth equipartition runner passes through second filtration passageway intercommunication, 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 outlet, 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, 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;

a water inlet pipe connected to the first inlet and outlet of the composite filter element assembly;

the pure water pipe is connected with the third inlet and outlet of the composite filter element assembly;

the conversion pipe is respectively connected with the second inlet and the fourth outlet;

and the booster pump is connected in series to the conversion pipe.

2. The water purification system of claim 1, further comprising: and the conversion control valve is connected to the conversion pipe in series.

3. The water purification system of claim 2, further comprising: and the high-voltage switch is connected in series with the pure water pipe and is electrically connected with the conversion control valve.

4. The water purification system of claim 1, further comprising: the check valve is connected in series with the pure water pipe.

5. The water purification system of claim 1, wherein the second filter unit has a fifth inlet and 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 passage, and the waste water flow chamber is communicated with the fifth inlet and outlet.

6. The water purification system of claim 5, further comprising:

a waste pipe connected to the fifth inlet/outlet of the composite filter element assembly;

the waste water valve is connected in series to the waste water pipe.

7. The water purification system of claim 6, wherein the waste valve is an adjustable waste valve, the waste valve being an accumulation mode flush or a standby flush.

8. The water purification system of claim 1, wherein the first filter member is a roll made of non-woven fabric, polypropylene layer, or carbon fiber, and the second filter member is a carbon cartridge.

9. The water purification system of claim 1, wherein the first filter element is sleeved outside the second filter element, the first filter element and the second filter element are spaced apart by a water path spacer, the outer peripheral side of the first filter element forms the first equispaced flow path, the first filter element and the water path spacer define the second equispaced flow path therebetween, the second filter element and the water path spacer define the third equispaced flow path therebetween, and an inner cavity surrounded by the second filter element forms the fourth equispaced flow path.

10. The water purification system of claim 5, wherein the second filter unit comprises: a reverse osmosis membrane element, the reverse osmosis membrane element comprising: the reverse osmosis membrane water purifier comprises a central pipe group and a plurality of reverse osmosis membrane bags, wherein the central pipe group comprises a central pipe and a plurality of waste water pipes arranged at intervals, the plurality of waste water pipes are arranged around the central pipe, the pipe wall of the central pipe is provided with filtered water inlet holes, and the pipe wall of each waste water pipe is provided with a waste water inlet hole;

said reverse osmosis membrane bags having a first portion located inside said central tube bank and a second portion located outside said central tube bank, each said waste and said central tube being separated by at least a first portion of said reverse osmosis membrane bags, said second portions of a plurality of said reverse osmosis membrane bags forming a multi-layer membrane module around the circumference of said central tube bank; wherein the content of the first and second substances,

the water entering the high-pressure cavity from the fourth inlet and outlet flows to the filtered water inlet hole after being filtered by the reverse osmosis membrane bag, the pipe cavity of the central pipe forms the filtered water circulation cavity, the pipe cavity of the waste water pipe forms the waste water circulation cavity, and the reverse osmosis membrane bag forms the filtering membrane.