CN111115879B

CN111115879B - Water purification system

Info

Publication number: CN111115879B
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: 2024-10-15
Anticipated expiration: 2038-10-31
Also published as: CN111115879A

Abstract

The invention discloses a water purification system, which comprises: 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 which are axially spaced apart and communicated by a transition flow passage. The first filter unit has an inlet connected to the water inlet pipe, two outlets connected to the start of the converting pipe and the start of the pure water pipe, and the second filter unit has an inlet connected to the end of the converting pipe. The first filter unit is internally provided with a first filter piece, the second filter piece is arranged in the second filter channel, and the interval between the second uniformly distributed flow channel and the third uniformly distributed flow channel is never circulated. The second filter unit is internally provided with a third filter element. The booster pump is connected in series to the transfer pipe. The water purifying 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

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

Usually, the existing water purifier filter element is generally 3-4 grades, and the water purifier filter element of partial manufacturer is double-core. In order to improve the filter effect of the composite filter element assembly, a plurality of filter element assemblies are arranged in the water purifier, water inlets and water outlets among the filter element assemblies are sequentially connected in series, water inlet channels and water outlet channels are formed on two sides of different filter elements respectively, three-stage and four-stage filter element assemblies are often required to be connected in series for achieving high-quality drinking water, and external pipelines are required to be connected between the water outlet channels and the water inlet channels among the different filter element assemblies, so that the internal pipeline system of the water purifier is numerous and miscellaneous, the whole water purifier occupies a larger space, the filter elements are inconvenient to install and replace, water leakage is easy to occur at the connecting positions of the external pipelines, and the whole water amount capable of being purified is limited greatly. In addition, each pipeline of the water purification system formed by the filter elements of the water purifier is complex in arrangement, and all stages of filter units are connected through external pipelines, so that the reliability is poor, and the control precision is low.

Disclosure of Invention

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

According to an embodiment of the present invention, a water purification system includes: the composite filter element assembly is characterized in that a first filter unit and a second filter unit are arranged in a shell of the composite filter element assembly at intervals along the axial direction, the first filter unit is provided with a first inlet and a second inlet and a third inlet and a fourth outlet, a transition flow passage is arranged between the first filter unit and the second filter unit, a first uniform flow passage, a first filter passage, a second uniform flow passage, a third uniform flow passage, a second filter passage and a fourth uniform flow passage are sequentially arranged in the first filter unit, a first filter piece is arranged in the first filter passage, a second filter piece is arranged in the second filter passage, the first uniform flow passage is communicated with the second uniform flow passage through the first filter passage, the third uniform flow passage is communicated with the fourth uniform flow passage through the second filter passage, no flow is isolated between the second flow passage and the third flow passage, the first uniform flow passage is connected with the first inlet and the first outlet, the second flow passage is connected with the second uniform flow passage, the second uniform flow passage is connected with the second inlet and the third filter passage, and the second filter piece is connected with the inlet and the fourth filter passage in the second uniform flow passage; the water inlet pipe is connected with the first inlet and the first 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 inlet; and the booster pump is connected on the conversion pipe in series.

According to the water purification system provided 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 matched compactly, the external connecting pipelines communicated between the third filtering piece and the second filtering piece are saved, the number of external pipelines is saved, and the arrangement simplicity and the operation reliability of the whole water purification system are improved. The arrangement of each pipeline is centralized and easy. Four uniformly distributed flow channels 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 whole structure in the first filtering unit is compact, and two filtering functions are integrated. The second uniformly distributed flow channels and the third uniformly distributed flow channels are in no way circulated at intervals, so that the first filter piece and the second filter piece form front and rear filtration respectively, and two different filtration systems are formed. The third filter element is arranged in the second filter unit, so that the integral filter function of the water purification system can be further increased, and the quality of the final effluent is improved. Through each pipeline connection of the water purification system, raw water entering the water purification system is primarily purified through a first filter element of a first filter unit, then enters a second filter unit for filtration, and then returns to the first filter unit for filtration by the second filter element. The second filter unit is provided with a first filter element, a second filter element and a third filter element, wherein the second filter element is provided with a water inlet, a water outlet and a water outlet, and the third filter element is provided with a water inlet. The composite filter element assembly is arranged in such a way that the filter pieces which can be subjected to normal pressure filtration or low pressure filtration are concentrated in the first filter unit, the filter pieces which need to be subjected to high pressure filtration are concentrated in the second filter unit, the filter pieces and the second filter unit are separately arranged, all parts of the first filter unit are connected and can be assembled according to the normal pressure requirement, the assembly cost is prevented from being too high, and all parts of the second filter unit are connected and assembled according to the high pressure requirement.

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

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

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

According to the water purification system provided by the embodiment of the invention, the second filtering unit is provided with a fifth inlet and outlet, a filtered water circulation cavity and a waste water circulation cavity are arranged in the second filtering unit, a filtering 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 channel, and the waste water circulation cavity is communicated with the fifth inlet and outlet.

According to a further embodiment of the invention, it further comprises: a waste pipe connected to the fifth inlet and outlet of the composite filter element assembly; and the waste water valve is connected to the waste water pipe in series.

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

According to the water purifying system provided by the embodiment of the invention, the first filtering piece is a winding drum formed by winding non-woven fabrics, polypropylene layers and carbon fibers, and the second filtering piece is a carbon drum.

According to the water purifying system provided by the embodiment of the invention, the first filter piece is sleeved outside the second filter piece, the first filter piece and the second filter piece are spaced by the waterway spacing cylinder, the first uniform distribution flow channel is formed on the outer periphery side of the first filter piece, the second uniform distribution flow channel is defined between the first filter piece and the waterway spacing cylinder, the third uniform distribution flow channel is defined between the second filter piece and the waterway spacing cylinder, and the inner cavity surrounded by the second filter piece forms the fourth uniform distribution flow channel.

According to a water purification system of one embodiment of the present invention, the second filtering unit includes: a reverse osmosis membrane element, the reverse osmosis membrane element comprising: the device comprises a central tube group and a plurality of reverse osmosis membrane bags, wherein the central tube group comprises a central tube and a plurality of waste water pipes which are arranged at intervals, the waste water pipes are arranged around the central tube, a water filtering inlet is formed in the wall of the central tube, and a waste water inlet is formed in the wall of the waste water pipe; the reverse osmosis membrane sheet bags having a first portion located inside the central tube group and a second portion located outside the central tube group, each of the wastewater tubes and the central tube being separated by at least one first portion of the reverse osmosis membrane sheet bag, the second portions of the plurality of reverse osmosis membrane sheet bags forming a multi-layered membrane module around the periphery of the central tube group; the water entering the high-pressure cavity from the fourth inlet and outlet flows to the filtered water inlet after being filtered by the reverse osmosis membrane bag, the cavity of the central pipe forms the filtered water circulation cavity, the cavity of the waste 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 foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

fig. 1 is a schematic view illustrating the overall structure of a water purification system according to an embodiment of the present invention.

FIG. 2 is a schematic general structural view of a composite filter element assembly according to one embodiment of the invention.

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

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

Fig. 5 is a schematic side view of a third end cap according to one embodiment of the invention.

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

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

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

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

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

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

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

Reference numerals:

Composite filter element assembly 1000;

A first filtering unit 100;

a first filter element 10; the first uniform distribution flow channels 11; a second uniform flow channel 12; a first filter passage 13;

A first port 101; a second port 102;

a second filter 20; a third uniform flow channel 21; fourth uniform flow channels 22; a second filter passage 23; a transition flow passage 24;

a third port 201;

A second filtering unit 200;

A third filter 30; fifth uniform flow channels 31; a third filter passage 32; a central tube 33; a waste water header 34; a filtration 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 tube 46;

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

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

A 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 one-way valve 520;

waste 600; a waste water valve 610;

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

faucet 900.

Detailed Description

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

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

In a composite filter element assembly 1000 according to an embodiment of the present invention, as shown in fig. 2, a first filter unit 100 and a second filter unit 200 are disposed in a housing 300 of the composite filter element assembly 1000 to be spaced apart in an axial direction.

The first filter unit 100 has a first inlet and outlet 101, a second inlet and outlet 102, and a third inlet and outlet 201, the second filter unit 200 has a fourth inlet and outlet 302, and a transition flow passage 24 is provided between the first filter unit 100 and the second filter unit 200. The first filter unit 100 and the second filter unit 200 are arranged at intervals in the axial direction and are connected through the transition flow channel 24, the first filter unit 100 and the second filter unit 200 are matched and compact to form a whole, and part of external connecting pipelines are saved.

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

The first filter element 10 is arranged in the first filter channel 13, and the second filter element 20 is arranged in the second filter channel 23. Here, the two purifying waterways of the first filtering member 10 and the second filtering member 20 can increase the filtering performance of the first filtering unit 100, and meet the requirements of different water quality and water outlet effects.

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

The second uniform distribution flow channel 12 and the third uniform distribution flow channel 21 are isolated from flowing. Two uniform distribution flow channels which are not circulated are isolated, so that two mutually independent purifying waterways in the first filtering unit 100 are not interfered with each other during operation. The water discharged from one of the purification waterways can be directly used as the water fed from the other purification waterway; the water discharged from one of the purifying waterways can be filtered by other external filtering components and then used as the water for the other purifying waterway.

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

One of the third uniform distribution flow channel 21 and the fourth uniform distribution flow channel 22 is connected with the third inlet and outlet 201, and the other of the third uniform distribution flow channel 21 and the fourth uniform distribution flow channel 22 is connected with the transition flow channel 24. Here, when the third uniform distribution flow channel 21 is connected to the transition flow channel 24, the fourth uniform distribution flow channel 22 is connected to the third inlet and outlet 201; when the third uniform distribution flow channel 21 is connected with the third inlet and outlet 201, the fourth uniform distribution flow channel 22 is connected with the transition flow channel 24.

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

It will be appreciated that the first filter unit 100 is provided with four evenly distributed channels and two filter channels in sequence along the radial direction, so as to form two mutually independent purifying waterways, and the two filter channels are respectively provided with filter elements. The overall structure in the first filter unit 100 is compact, two water quality filtering links are integrated in the first filter unit 100, and the composite filter element assembly 1000 of the invention is provided with three water quality filtering links as a whole by adding a group of filtering pieces in the second filter unit 200.

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

In view of the layout positions of the first uniform distribution flow channel 11, the first filtering channel 13, the second uniform distribution flow channel 12, the third uniform distribution flow channel 21, the second filtering channel 23 and the fourth uniform distribution flow channel 22, most of the water flows pass along the radial direction of the first filtering unit 100 when passing through the first filtering piece 10 and the second filtering piece 20, and the passing path is short and the flow rate is large. And the impurities on the surface of the filter element are washed out when the water flow passes through the filter element, and the water flow can easily wash out the impurities and pass through the filter element. And most of water flows basically flow along the axial direction when water flows in and out of each filter element, so that the water flows are uniformly distributed, the washed impurities are brought to one axial end of the first filter unit 100, and the impurities are prevented from being blocked on the surface of the filter element.

The first filter unit 100 and the second filter unit 200 are arranged in the same composite filter element assembly 1000, so that the integration degree is high, the structural size is reduced, and when the composite filter element assembly 1000 is installed, only one set of positioning and installing structure is needed, so that the assembly is simple and time-saving.

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 both ends, and the housing 300 is provided with a housing upper cover 310 and a housing lower cover 320 at both ends. When the first filter 10 and the second filter 20 need to be replaced, only the case upper cover 310 needs to be opened, and when the third filter 30 needs to be replaced, only the case lower cover 320 needs to be opened.

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

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

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

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

In some embodiments of the present invention, as shown in fig. 2, 3, and 4, the second filter unit 200 has a fifth inlet 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 301 is a discharge port for wastewater generated after the second filter unit 200 is filtered. Correspondingly, the fourth inlet and outlet 302 is the 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 circulation chamber and the waste water circulation 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 features described, and not sequentially or lightly.

Optionally, as shown in fig. 2, a fifth uniform distribution flow channel 31 and a third filtering channel 32 are sequentially arranged in the second filtering unit 200 from outside to inside along the radial direction, the third filtering channel 32 is arranged around a filtering 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, and the fifth uniform distribution flow channel 31 is communicated with a fourth inlet and outlet 302. Here, the liquid entering from the fourth inlet and outlet 302 is distributed and distributed in the fifth uniform distribution flow channel 31, uniformly distributed on the outer side of the third filter 30, filtered by the third filter 30, and the high salinity wastewater flows into the wastewater flow chamber and is discharged through the fifth inlet and 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 along the radial direction, the passing path is short, the flow rate is high, impurities on the surface of the filter membrane 35 are washed away when the water flow passes through the third filter element, and the water flow passes through the filter membrane 35 after washing away the impurities more easily.

The water flowing in and out of the fifth uniform distribution runner 31 outside the third filter element 30 and the water flowing in and out of the inner side of the central tube 33 flow along the axial direction basically, which is beneficial to uniform distribution of the water flow and bringing the impurities flushed down by the surface of the third filter element 30 to one axial end of the second filter unit 200, and avoiding the impurities from blocking the filtering surface.

In some embodiments, as shown in fig. 2, 6, 7, 8 and 9, a central tube 33 and a plurality of wastewater headers 34 are provided in the second filtering unit 200, the plurality of wastewater headers 34 are provided around the central tube 33, a filtering membrane 35 is provided on the outer circumference of the central tube 33, the central tube 33 is communicated with the transition flow passage 24, and filtering water inlets are provided on the tube wall. The filtering membrane 35 on the outer periphery of the central tube 33 is a reverse osmosis membrane, and only pure water with smaller salinity and better water quality can pass through. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.

In some embodiments, as shown in fig. 10-12, the central tube 33, the plurality of wastewater headers 34, and the filtration membrane 35 comprise a spiral wound reverse osmosis membrane element. The lumen of the central tube 33 constitutes the filtered water circulation chamber, and the lumen of the waste water header 34 constitutes the waste water circulation chamber.

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

After the water entering the second filter unit 200 from the fourth inlet and outlet 302 is filtered by the reverse osmosis membrane bag, the water flows spirally along the second portion of the reverse osmosis membrane bag toward the central tube 33, and the water molecules continuously permeate into the reverse osmosis membrane bag during the flowing process, and the purified water permeated into the reverse osmosis membrane bag also flows spirally toward the central tube 33. The purified water finally flows from the filtered water inlet toward 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, 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. Optionally, the third filter 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-saving membrane, and through side flow water inflow, the surface flow velocity of the membrane is improved, the high recovery rate of pure water is ensured, and the longer service life of the filtering membrane 35 is ensured.

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

In some embodiments of the present invention, as shown in fig. 2, the fourth uniform distribution channel 22 is cylindrical, and the first uniform distribution channel 11, the first filtering channel 13, the second uniform distribution channel 12, the third uniform distribution channel 21, and the second filtering channel 23 are annular in a layer-by-layer manner. Here, the fourth uniform flow channel 22 is in the center of the first filter unit 100, which is cylindrical. The outer side of the fourth uniform distribution runner 22 is sleeved with a circle of second filtering channels 23, the outer side of the second filtering channels 23 is sleeved with a circle of third uniform distribution runner 21, the outer side of the third uniform distribution runner 21 is sleeved with a circle of second uniform distribution runner 12, the outer side of the second uniform distribution runner 12 is sleeved with a circle of first filtering channels 13, and the outer side of the first filtering channels 13 is sleeved with a circle of first uniform distribution runner 11. Thus, each layer of filter element has larger filtering area, uniform flow distribution of the filter elements, compact overall arrangement of the first filter unit 100, small occupied installation space and 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 filter unit 100, and the first inner end cap 41 seals the end surfaces of the second filter channel 23 and the fourth uniform distribution channel 22 facing the second filter unit 200 so as to block the second filter channel 23 and the fourth uniform distribution channel 22. The first inner end cap 41 here blocks the second uniform filter channel 23 and the fourth uniform distribution channel 22, which means that the first inner end cap 41 seals the axial end surfaces of the second uniform filter channel 23 and the fourth uniform distribution channel 22, so that water in the second uniform filter channel 23 and the fourth uniform distribution channel 22 cannot flow out or flow in from the axial end surfaces facing the transition channel 24. The meaning of the end cap mentioned below is also the same when it plugs a certain filtering channel and a certain uniformly distributed flow channel, and will not be described in detail.

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

Advantageously, the two ends of the second filter element 20 are respectively flush with the end surfaces of the second filter channel 23, and since the first inner end cover 41 closes the second filter channel 23, the first inner end cover 41 also closes the bottoms of the second filter element 20 and the fourth uniform distribution flow channel 22, and provides a bottom support for the second filter element 20, so that the liquid to be purified on the two sides of the second filter element 20 is effectively prevented from being in series with the purified liquid at the bottom, and the filtering effect of the second filter element 20 is ensured. Optionally, the first inner end cover 41 is provided with an inner flange extending into the fourth uniform distribution channel 22, and an outer circumferential surface of the inner flange contacts an inner circumferential surface of the second filter element 20. Optionally, the outer periphery of the first inner end cap 41 is provided with a turned-out rim, the inner side of which is in contact with the outer peripheral surface of the second filter element 20. The arrangement of the inner flange and the outward flange can enhance the liquid blocking effect of the first inner end cover 41 on the end surfaces of the fourth uniform distribution flow channel 22 and the second filter element 20; and a foolproof fit can be formed for the first inner end cap 41 and the second filter element 20, which is easy to assemble.

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

In some embodiments of the present invention, as shown in fig. 2, a first outer end cover 42 and a waterway spacer 46 are provided in the first filtering unit 100, the first outer end cover 42 is sealed on the end surfaces of the first filtering channel 13 and the second uniform distribution channel 12 facing the second filtering unit 200, and the waterway spacer 46 is connected to the first outer end cover 42 and is spaced between the second uniform distribution channel 12 and the third uniform distribution channel 21. As shown in fig. 2, the first outer end cover 42 seals the bottoms of the first filter element 10 and the second uniform distribution runner 12, and provides support for the first filter element 10, so that the liquid to be purified on both sides of the first filter element 10 is effectively prevented from being in series with the purified liquid at the bottom, and the filtering effect of the first filter element 10 is ensured. The waterway spacing cylinder 46 reliably separates the second uniform distribution flow channel 12 from the third uniform distribution flow channel 21, avoids the streaming of liquid in the first filter element 10 and the second filter element 20, and avoids the reduction of water quality in each uniform distribution flow channel.

Alternatively, waterway spacer tube 46 is integrally formed with first outer end cap 42. The integrated forming is convenient for processing and manufacturing. After being integrally formed, the waterway spacing tube 46 and the first outer end cover 42 are not easy to generate gaps, and the position is relatively stable. The integrated forming is also convenient to assemble, 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 first filter element 10 and the second filter element 20 can be well supported after being formed into a whole. Optionally, the middle of the first outer end cover 42 protrudes upwards to form a boss, and the first inner end cover 41 is suspended above the boss. That is, a certain gap is formed between the first inner end cover 41 and the boss, so that the third uniform distribution flow channel 21 and the transition flow channel 24 are kept in communication, and the purifying waterways 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 element 20 may flow through the transition flow passage 24 to the third filter element 30, and be filtered again by the third filter element 30; or the water filtered by the third filter element 30 may flow through the transition flow passage 24 to the second filter element 20 for re-filtration by the second filter element 20. Optionally, the first outer end cap 42 separates the first filter unit 100 and the second filter unit 200 in an axial direction, and the first outer end cap 42 is provided with a transition flow channel 24 in the axial direction. The first outer end cap 42 initially separates the first filter element 10, the second filter element 20 and the third filter element 30 in an axial direction, and the transition flow passage 24 thereon establishes a series relationship between the second filter element 20 and the third filter element 30. The external piping required for the connection between the second filter element 20 and the third filter element 30 is saved.

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

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

Optionally, the gap between the first inner end cover 41 and the first outer end cover 42 is smaller, the first inner end cover 41 contacts with the first outer end cover 42 when being acted towards the first outer end cover 42, and the gap is enlarged when the first inner end cover 41 is squeezed by the inflow water of the transition runner 24, so that the waterway circulation is more smooth. The provision of the first inner end cap 41 in a suspended design at a small distance from the first outer end cap 42 allows for a delicate balancing of the water pressure as it passes through the second filter element 20. That is, when the water pressure in the fourth uniform distribution flow passage 22 is greater than the water pressure at the transition flow passage 24, the first inner end cover 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 disposed in the first filter unit 100, the second outer end cap 44 is sealed to the end surface of the first filter channel 13 remote from the second filter unit 200, and the second inner end cap 43 is sealed to the end surface of the second filter channel 23 remote from the second filter unit 200.

Here, the second inner end cover 43 closes the top of the second filtering passageway 23, and provides a top connection for the second filtering element 20, and provides a trend for the third inlet/outlet 201, so that the liquid to be purified on both sides of the second filtering element 20 is effectively prevented from being in series with the purified liquid on the top, and the filtering effect of the second filtering element 20 is further ensured. The fluid filtered by the second filter assembly 20 is collected in the fourth uniform distribution flow channel 22 and can be discharged from the third inlet and outlet 201.

Correspondingly, the second outer end cover 44 seals the tops of the first filtering channel 13 and the second uniform distribution flow channel 12, provides connection for the first filtering element 10 in the first filtering channel 13, separates the first inlet and outlet 101 from the second inlet and outlet 102, effectively prevents the liquid to be purified at the two sides of the first filtering element 10 from being in series with the purified liquid at the top, and further ensures the filtering effect of the first filtering element 10.

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

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

Advantageously, a second outer end cap 44 is fitted over the axial end face of the first filter element 10 remote from the transition flow channel 24 to block the first filter element 10.

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

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

Optionally, the second outer end cover 44 is sleeved outside the second inner end cover 43, 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. The second middle end cover 45 further seals the upper portion of the first filtering unit 100, and further separates the second uniform distribution flow channel 12 from the third uniform distribution flow channel 21, which is also beneficial to the separation arrangement of the second inlet and outlet 102 and the third inlet and outlet 201.

The second middle end cover 45 is arranged instead of integrally forming the second middle end cover 45 and the waterway spacer 46, so that the die sinking is facilitated, the assembly is needed, and the reliability of the integral 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 element 20 is to be assembled to the inner side of the waterway spacer 46, the waterway spacer 46 cannot be assembled when the opening is small, and the assembly of the second outer end cover 44 and the first filter element 10 is affected when the opening of the waterway spacer 46 is large, so that the overall assembly difficulty is increased.

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

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

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

In some specific examples, all of the components within the first filter unit 100 are preassembled as one piece, i.e., the first filter element 10, the second filter element 20, the first inner end cap 41, the first outer end cap 42, the second inner end cap 43, the second outer end cap 44, the second middle end cap 45 are preassembled as an integral front-to-back integral filter cartridge. Even the sealing ring can be preassembled.

Such front and rear integrated cartridges can be directly inserted between the partition plate and the housing upper cover 310 in the housing 300 during assembly, and the overall assembly process is greatly simplified. And if the upper cover 310 of the shell is detachably connected to the bottle body, after the use, a user can also replace the front-rear integrated filter element by himself, and the operation steps of the user during the replacement are very easy, so that the core replacement experience of the user is improved, and the core replacement cost is reduced.

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 being sealed at an end of the third filter channel 32 and the waste water flow chamber facing the first filter unit 100, the fourth end cap 48 being sealed at an end of the third filter channel 32 and the filtered water flow chamber facing away from the first filter unit 100. The third and fourth end caps 47, 48 provide a positive mounting for the third filter element 30, the center tube 33, and the wastewater header 34.

Here, the third end cap 47 closes the top of the third filter element 30 and the waste water circulation chamber and provides a top connection for the third filter element 30, effectively preventing the liquid to be purified and the liquid after being purified on both sides of the third filter element 30 from being strung 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, effectively preventing the liquid to be purified and the purified liquid from flowing in series at the bottom on both sides of the third filter element 30, and ensuring the filtering effect of the third filter element 30.

Specifically, as shown in fig. 2, 5, 6 and 7, the two ends of the third end cover 47 are provided with a second cannula 471 and a third cannula 472 which are communicated with each other, the second cannula 471 is inserted into the transition flow channel 24, and the third cannula 472 is connected with the central tube 33. Here, the third end cap 47 closes the top of the third filter element 30 and provides a supporting connection of the top to the third filter element 30, effectively preventing the liquid to be purified and the liquid after being purified on both sides of the third filter element 30 from being strung on the top.

The third end cover 47 is inserted into the transition flow channel 24 through the second insertion tube 471, so that on one hand, the sealing is convenient, and high-pressure water in the second filtering unit 200 is prevented from flowing to the transition flow channel 24 without being filtered by the third filtering piece 30, on the other hand, the positioning of the transition flow channel 24 is utilized, and the positioning accuracy is improved and meanwhile, the assembly difficulty is reduced.

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

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

Optionally, as shown in fig. 6 and 7, the peripheral wall of the third end cover 47 is provided with first assembling and positioning structures 474, and the first assembling and positioning structures 474 are arranged at intervals along the circumferential direction, and the first assembling and positioning structures 474 stop against the inner wall of the casing 300, so as to improve the centering degree of the third filter 30 in the second filter unit 200, and avoid the situation that the third filter 30 is totally skewed and cannot be matched well at the transition flow channel 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, a fourth insertion tube 481 is provided on the fourth end cap 48, and a waste outlet 482 connected to the waste water header 34 and the fifth inlet 301, respectively, is provided on the fourth end cap 48.

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

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

A water purification system 2000 according to 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 includes: 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 in the foregoing and will not be described in detail herein.

As shown in fig. 1, the inlet tube 400 is connected to the first inlet port 101 of the composite filter element assembly 1000. Here, tap water to be purified (or raw water from other 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.

Pure water pipe 500 connects third inlet and outlet 201 of composite filter element assembly 1000. Here, the pure water after the multi-stage filtration of the composite filter element assembly 1000 may be outwardly guided by the pure water pipe 500.

The transfer pipe 700 is connected to the second inlet 102 and the fourth inlet 302, respectively, and the booster pump 710 is connected to the transfer pipe 700 in series. The switching pipe 700 communicates the flow path between the first filter element 10 and the third filter element 20, so that the front-end water filtered by the first filter element 10 enters the fifth uniform flow path 31 in the third filter element 20. The air enters the third filter element 20 for filtering after being pressurized by the booster pump 710, so that the filtering speed can be increased, and the filtering efficiency can be improved. When the third filter 20 adopts a reverse osmosis membrane module or an ultrafiltration membrane module, conversion from low-ion-concentration front-end effluent to high-ion-concentration wastewater and pure water can be completed.

It can be appreciated that, in the present invention, the first filtering unit 100 and the second filtering unit 200 are disposed at intervals in the axial direction and are connected by the transition flow channel 24, the two filtering units are matched compactly, the transition flow channel 24 replaces the external connecting pipeline required for communication between the third filtering member 30 and the second filtering member 20, that is, the external water inlet connecting pipeline of the second filtering member 20 is saved, the external water outlet connecting pipeline of the third filtering member 30 is also saved, so that the overall water purifying system 2000 saves the number and arrangement difficulty of the external pipelines, the overall design simplicity of the water purifying system 2000 is increased, and the operational reliability of the water purifying system 2000 is increased.

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

Through the connection of the pipes of the water purification system 2000, raw water entering the water purification system 2000 is primarily purified by the first filter 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 20. Wherein the pressure is increased by the booster pump 710 before entering the second filter unit 200, so that the water flow can pass through the third filter 30 at high pressure, thereby improving the filtering efficiency. The composite filter element assembly 1000 is configured such that the filter elements (the first filter element 10 and the second filter element 20) capable of normal pressure filtration or low pressure filtration are concentrated in the first filter unit 100, the filter elements (the third filter element 30) requiring high pressure filtration are concentrated in the second filter unit 200, the two filter elements are separately arranged, the connection of the parts of the first filter unit 100 can be assembled according to the normal pressure requirement, the assembly cost is prevented from being excessively high, and the connection of the parts 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 includes: the control valve 720 is switched. A switching control valve 720 is connected in series to the switching pipe 700, and the switching control valve 720 can control the flow and cut-off of the water flow in the switching pipe 700. The system is judged by blocking the flow of water flow on the conversion pipe 700, and the conversion control valve 720 is close to the booster pump 710, so that the booster pump 710 is ensured not to flow any more during judgment, and the booster pump 710 is protected. Moreover, since the water pressure of the second filter unit 200 is higher than that of the first filter unit 100, the switching control valve 720 is provided on the switching pipe 700 to control the entire system, and thus the reverse flow of the water flow in the second filter 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 to the pure water pipe 500, and the high-voltage switch 510 is electrically coupled to the switching control valve 720. The high-pressure switch 510 is provided on the pure water pipe 500, and when it is detected that the pressure at the pure water outlet is 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-voltage switch 510 is electrically connected with the switching control valve 720, and can control the switching of the switching control valve 720, so that the water pressure in the water outlet pipe 500 and the switching pipe 700 is kept stable, and each waterway in the whole water purification system 2000 is coordinated to operate.

Optionally, as shown in fig. 1, the water purification system 2000 further includes: a check valve 520 connected in series to the pure water pipe 500. The one-way valve 520 ensures that the filtered drinking water from the second filter member 20 flows toward the final water use end without flowing back, so that the water purifying system 2000 operates stably and reliably.

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

In some embodiments of the present invention, as shown in fig. 1, the water purification system 2000 further includes: a waste 600 and a waste valve 610. The waste pipe 600 is connected to the fifth inlet 301 of the composite filter element assembly 1000, and the waste water valve 610 is connected to the waste pipe 600 in series. The waste water valve 610 is opened to control the discharge of the waste water with high salt content in the third filter unit 30 to the outside, thereby ensuring the normal operation of the third filter unit 30.

Alternatively, waste valve 610 is an adjustable waste valve.

In some examples, the waste valve 610 is a cumulative flush. I.e., when the waste liquid accumulates to a certain amount, the control system controls the waste water valve 610 to be opened once.

In some examples, the waste valve 610 is a stand-by flush.

The adjustable waste valve ensures that the waste valve 610 itself does not clog while ensuring the life of the third filter element 30. When the third filter element 30 works for a period of time, a certain amount of wastewater is accumulated, the wastewater valve 610 is opened to drain, the condition that the wastewater is accumulated on the surface of the third filter element 30 for a long time to damage the third filter element 30 is avoided, the integral utilization rate of the third filter element 30 is improved, and the water filtering flow rate is improved; the corrosion of the high salinity wastewater to the wastewater valve 610 is reduced continuously, and the service life of the wastewater valve 610 is prolonged.

For a better understanding of the aspects of the embodiments of the present invention, the structure of the water purification system 2000 in one embodiment of the present invention is described below with reference to fig. 1 to 12.

The water purification system 2000 includes a composite filter cartridge assembly 1000, a water inlet pipe 400, a pure water pipe 500, a high pressure switch 510, a check valve 520, a waste water pipe 600, a waste water valve 610, a switching pipe 700, a booster pump 710, a switching control valve 720, and a faucet 900.

As shown in fig. 1 and 2, a composite filter element assembly 1000 is provided such that the entire composite filter element assembly 1000 is normally installed in a vertical state. Comprises a housing 300, and a first filter unit 100 and a second filter unit 200 which are arranged in the housing 300 along the axial direction at intervals, wherein a transition flow passage 24 is arranged between the first filter unit 100 and the second filter unit 200 for communication.

The first filter unit 100 is internally provided with a first uniform distribution flow passage 11, a first filter passage 13, a second uniform distribution flow passage 12, a third uniform distribution flow passage 21, a second filter passage 23 and a fourth uniform distribution flow passage 22 which are arranged in a stacking manner in sequence from outside to inside along the radial direction. The first filter passage 13 is provided therein with a first filter element 10 of a roll type formed by rolling a nonwoven fabric, a polypropylene layer, carbon fibers and a spacer bracket 49. The first filter element 10 serves as a primary filter unit for tap water, and the spacing brackets 49 are supported in the second uniform distribution flow channel 12.

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

As shown in fig. 2, a hollow carbon rod is provided in the second filter passage 23 as the second filter element 20. The second filter member 20 serves as a final filter unit before the drinking water is discharged. The third uniform distribution flow channel 21 is communicated with the fourth uniform distribution flow channel 22 through the second filtering channel 23. The third uniform distribution runner 21 is connected with the transition runner 24, the fourth uniform distribution runner 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 uniform distribution flow channel 12 and the third uniform distribution flow channel 21 are separated by a waterway spacer 46. The first filter unit 100 is provided with 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, wherein the first inner end cover 41 is sealed on the end surfaces of the second filter channel 23 and the fourth uniform distribution flow channel 22, which face the second filter unit 200. The first outer end cover 42 seals the end surfaces of the first filtering channel 13 and the second uniform distribution flow channel 12 facing the second filtering unit 200. A certain 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 tube 46 and is integrally formed therewith. The second outer end cap 44 seals the end face of the first filter channel 13 remote from the second filter unit 200, and the second inner end cap 43 seals the end face of the second filter channel 23 remote from the second filter unit 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 a second inlet and outlet 102.

As shown in fig. 2, 3 and 4, a third filter 30 composed of a side-stream reverse osmosis membrane module is provided in the second filter unit 200, and the third filter 30 serves as an intermediate filter before carbon filtration. The second filtering unit 200 is internally and sequentially provided with a fifth uniform distribution flow passage 31 and a third filtering passage 32 from outside to inside along the radial direction, the third filtering passage 32 is arranged around a filtering water circulation cavity and a waste water circulation cavity, the third filtering passage 32 is internally provided with a third filtering piece 30, the waste water circulation cavity is communicated with the fifth uniform distribution flow passage 31 through the third filtering passage 32, the waste water circulation cavity is also communicated with a waste water header 34 in a reverse osmosis membrane assembly, the fifth uniform distribution flow passage 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 pressurization is needed before front water enters the fourth inlet and outlet 302. The second filtering unit 200 is internally provided with a filtered water circulation cavity and a waste water circulation cavity, 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, the transition flow passage 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 after the reverse osmosis membrane assembly purifies front water.

As shown in fig. 5, 6, 7, 8, 9, 10, 11, and 12, the third end cover 47 and the fourth end cover 48 are provided in the second filter unit 200. The third end cap 47 is sealed to the third filter passage 32 and the end of the waste water flow chamber facing the first filter unit 100, and the fourth end cap 48 is sealed to the third filter passage 32 and the end of the filtered water flow chamber facing away from the first filter unit 100. Five waste water headers 34 are supported between the third end cover 47 and the fourth end cover 48, the middle of the fourth end cover 48 supports the bottom end of the central tube 33, a through hole is formed in the middle of the third end cover 47, a second insertion tube 471 and a third insertion tube 472 which are mutually nested are arranged in the through hole, the top end of the central tube 33 is connected with the third insertion tube 472, and the second insertion tube 471 is connected with the transition flow channel 24.

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

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

The upper cover 310 of the housing of the composite filter element assembly 1000 is provided with a second inlet and outlet 102 for leading out the water, and the second inlet and outlet 102 is connected with one end of the conversion tube 700.

A fourth inlet and outlet 302 for leading water to enter reverse osmosis is arranged on the lower cover 320 of the shell of the composite filter element assembly 1000, and the fourth inlet and outlet 302 is connected with the other end of the conversion tube 700. The transfer pipe 700 is provided with a booster pump 710 and a transfer control valve 720 in series, and the transfer control valve 720 is located at one end near the second inlet/outlet 102. The high voltage switch 510 is electrically connected to the changeover control valve 720.

The lower cover 320 of the casing of the composite filter element assembly 1000 is provided with a fifth inlet and outlet 301 which can discharge 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 employs an adjustable waste valve for integrated flushing.

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

The front water after flowing out is pressurized and pumped into the fourth inlet and outlet 302 and uniformly distributed in the fifth uniform distribution flow channel 31, flows in circumferentially from the side surface of the third filter element 30 (side flow reverse osmosis water-saving film) and is filtered by the third filter element 30, the wastewater with high salinity is collected by the wastewater header 34 and discharged into the wastewater pipe 600 from the fifth inlet and outlet 301, and after a certain time or wastewater amount is accumulated, the wastewater valve 610 is opened for one time to discharge. Pure water is collected upwardly from the central tube 33 through the transition port 332. Pure water enters the third uniform distribution flow channel 21 from the transition port 332, is filtered by the second filter element 20 (carbon cylinder), enters the fourth uniform distribution flow channel 22, flows out of the third inlet and outlet 201 onto the pure water pipe 500, flows out of the water tap 900 after passing through the one-way valve 520, and is drunk by a user.

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

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

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

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

Claims

1. A water purification system, comprising:

The composite filter element assembly is characterized in that a first filter unit and a second filter unit are arranged in a shell of the composite filter element assembly at intervals along the axial direction, the first filter unit is provided with a first inlet and a second inlet and a third inlet and a fourth outlet, a transition flow passage is arranged between the first filter unit and the second filter unit, a first uniform flow passage, a first filter passage, a second uniform flow passage, a third uniform flow passage, a second filter passage and a fourth uniform flow passage are sequentially arranged in the first filter unit, a first filter piece is arranged in the first filter passage, a second filter piece is arranged in the second filter passage, the first uniform flow passage is communicated with the second uniform flow passage through the first filter passage, the third uniform flow passage is communicated with the fourth uniform flow passage through the second filter passage, no flow is isolated between the second flow passage and the third flow passage, the first uniform flow passage is connected with the first inlet and the first outlet, the second flow passage is connected with the second uniform flow passage, the second uniform flow passage is connected with the second inlet and the third filter passage, and the second filter piece is connected with the inlet and the fourth filter passage in the second uniform flow passage;

the water inlet pipe is connected with the first inlet and the first 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 inlet;

a booster pump connected in series to the transfer pipe; the first filter piece is a winding drum formed by winding non-woven fabrics, polypropylene layers and carbon fibers, and the second filter piece is a carbon drum; the second filtering unit is provided with a fifth inlet and outlet, a filtered water circulation cavity and a waste water circulation cavity are arranged in the second filtering unit, a filtering 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 outlet; the first filter piece is sleeved outside the second filter piece, the first filter piece and the second filter piece are spaced by a waterway interval cylinder, the first uniformly distributed flow channel is formed at the outer periphery side of the first filter piece, the second uniformly distributed flow channel is defined between the first filter piece and the waterway interval cylinder, the third uniformly distributed flow channel is defined between the second filter piece and the waterway interval cylinder, and the inner cavity surrounded by the second filter piece forms the fourth uniformly distributed flow channel; the second filter unit includes: reverse osmosis membrane element.

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

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

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

5. The water purification system of claim 1, further comprising:

A waste pipe connected to the fifth inlet and outlet of the composite filter element assembly;

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

6. The water purification system of claim 5, wherein the waste water valve is an adjustable waste water valve that is a cumulative flush or a standby flush.

7. The water purification system of claim 1, wherein the reverse osmosis membrane element comprises: the device comprises a central tube group and a plurality of reverse osmosis membrane bags, wherein the central tube group comprises a central tube and a plurality of waste water headers which are arranged at intervals, the waste water headers are arranged around the central tube, a filtering water inlet is formed in the wall of the central tube, and a waste water inlet is formed in the wall of the waste water header;

the reverse osmosis membrane sheet bags having a first portion located inside the central tube group and a second portion located outside the central tube group, each of the wastewater header and the central tube being separated by at least one first portion of the reverse osmosis membrane sheet bag, the second portions of the plurality of reverse osmosis membrane sheet bags forming a multi-layered membrane module around the periphery of the central tube group; wherein,

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