CN111115876B

CN111115876B - Composite filter element assembly

Info

Publication number: CN111115876B
Application number: CN201811290840.0A
Authority: CN
Inventors: 李杨敏; 桂鹏; 郑跃东
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: 2024-09-03
Anticipated expiration: 2038-10-31
Also published as: CN111115876A

Abstract

The invention discloses a composite filter element assembly, which comprises: the first chamber and the second chamber of holding are held to the casing, first chamber and the second chamber of holding of defining in the casing, and first chamber and the second are held and hold and keep apart through the transition board between the chamber, are equipped with the transition mouth on the transition board, and first chamber that holds is the low pressure chamber, and the second holds the chamber and is the high pressure chamber, and first filtration group is established in first chamber that holds, and the second is filtered the group and is established in the second chamber that holds, and the second holds intracavity water and filters the back through the second filtration group, holds the chamber through the transition mouth flow direction first. According to the composite filter element assembly provided by the embodiment of the invention, the shell is divided into the low-pressure cavity and the high-pressure cavity through the flow channel design of the transition plate and the composite filter element assembly, so that the first filter group which can be purified and filtered at low pressure is separated from the second filter group which can be purified and filtered at high pressure, the pipeline connection is reduced, the water leakage risk is reduced, the purifying and filtering effect is improved, the reliability is high, and the purifying and filtering effect is good.

Description

Composite filter element assembly

Technical Field

The invention relates to the technical field of water purification, in particular to a composite filter element assembly.

Background

Tap water delivered to individual users from municipal water works typically contains a certain amount of salt ions, metal species, chlorides, microorganisms, silt, etc. In order to improve the drinking quality, more families choose to install water purifiers on a water outlet pipe of tap water, and the water purifiers are internally provided with a plurality of functional filter cores so as to remove different 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 usually arranged in the water purifier, water inlets and water outlets between the filter element assemblies are sequentially connected in series, water inlet cavities and water outlet cavities are respectively formed on two sides of different filter elements, three-stage and four-stage filter element assemblies are often required to be connected in series in order to achieve high-quality drinking water, and external pipelines are required to be connected between the water outlets and the water inlets between the different filter element assemblies, so that the pipeline system of the composite filter element assembly is complex, the whole water purifier occupies a large space, and the filter elements are inconvenient to install and replace.

Disclosure of Invention

The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, an object of the present invention is to provide a composite filter element assembly, which reduces the pipeline connection, reduces the risk of water leakage, improves the purification and filtration effects, and has high reliability and good purification and filtration effects.

The composite filter element assembly comprises a shell, a first filter group and a second filter group, wherein a first accommodating cavity and a second accommodating cavity are defined in the shell, the first accommodating cavity and the second accommodating cavity are separated by a transition plate, a transition opening is formed in the transition plate, the first accommodating cavity is a low-pressure cavity, the second accommodating cavity is a high-pressure cavity, water pressure in the first accommodating cavity is lower than water pressure in the second accommodating cavity, the first filter group is arranged in the first accommodating cavity, the second filter group is arranged in the second accommodating cavity, and water in the second accommodating cavity flows to the first accommodating cavity through the transition opening after being filtered by the second filter group.

According to the composite filter element assembly provided by the embodiment of the invention, the shell is divided into the first accommodating cavity and the second accommodating cavity through the transition plate, so that the first filtering group and the second filtering group are separated, the first accommodating cavity is set to be a low-pressure cavity, the second accommodating cavity is set to be a high-pressure cavity, the structural requirement of the low-pressure cavity is reduced, the first filtering group capable of purifying filtered water at relatively low pressure is arranged in the low-pressure cavity, the second filtering component with higher water pressure is arranged in the high-pressure cavity, the pipeline connection is reduced, the water leakage risk is reduced, the purifying and filtering effect is improved, the flow channel is simple in design, the reliability is high, and the purifying and filtering effect is good.

In addition, the composite filter element assembly according to the invention may also have the following additional technical features:

In some embodiments of the present invention, the housing is provided with a first inlet and a second inlet and a third outlet, the first filtering group comprises a first filtering piece, a second filtering piece and a waterway partition board, the waterway partition board is arranged in the first accommodating cavity, the waterway partition board partitions the first accommodating cavity into a first low pressure area and a second low pressure area, the first filtering piece is arranged in the first low pressure area, water flowing in from the first inlet and the second inlet flows out from the second inlet after passing through the first filtering piece, the second filtering piece is arranged in the second low pressure area, and water flowing in from the transition port flows out from the third inlet after passing through the second filtering piece.

In some embodiments of the invention, the water pressure in the high pressure chamber is 0.7-0.85MPa.

In some embodiments of the invention, the low pressure chamber has a water pressure less than or equal to the municipal water supply pressure.

Optionally, the water pressure in the first low pressure area is 0.1-0.4MPa.

Optionally, the water path partition plate is cylindrical, the second filter element is located at the inner side of the water path partition plate, and the first filter element is located at the outer side of the water path partition plate; the first filtering group comprises a first outer end cover, the first outer end cover is in sealing connection with one end periphery of the waterway partition plate, a first insertion pipe which is communicated with the second low-pressure area is arranged on the first outer end cover, the first insertion pipe is connected with the transition plate, and a first sealing piece is arranged between the first insertion pipe and the transition plate so as to prevent streaming of the high-pressure cavity and the first low-pressure area.

In some examples of the present disclosure, the first filtering group includes a second middle end cap, where the second middle end cap is connected with the other end edge of the waterway partition in a sealing manner, and a second middle insertion pipe is disposed on the second middle end cap, and the second middle insertion pipe is connected with the shell in a sealing manner, so as to avoid streaming between the second low pressure area and the first low pressure area.

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

In some examples of the invention, the second filter group further comprises: the third end cover and the fourth end cover are respectively connected to the two axial ends of the spiral wound reverse osmosis membrane element, the third end cover faces towards the transition plate, the central tube is connected with the transition hole through the third end cover, and the waste water tube is connected with the fifth inlet and outlet through the fourth end cover.

Optionally, two axial ends of the circular cylinder rolled out by the reverse osmosis membrane bag are glued on the third end cover and the fourth end cover.

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 illustration of the internal structure of a composite filter element assembly according to one embodiment of the invention;

FIG. 2 is a bottom view of FIG. 1;

FIG. 3 is a schematic view of the housing and water stop assembly of the composite filter element assembly according to one embodiment of the present invention;

FIG. 4 is a schematic illustration of the internal structure of a composite filter element assembly according to one embodiment of the invention, with the first filter group and the second filter group omitted;

FIG. 5 is a schematic cross-sectional view of a bottle of a composite filter element assembly according to one embodiment of the invention;

FIG. 6 is a schematic view of the bottle of a composite filter element assembly according to one embodiment of the 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 schematic perspective view of a center tube and a wastewater header according to one embodiment of the invention;

FIG. 10 is a top view of a reverse osmosis membrane and center tube, a wastewater header, in combination, in accordance with one embodiment of the invention;

fig. 11 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 accommodation chamber 100; a first filter group 400; a first low pressure zone 1; a second low pressure zone 2;

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

A first port 101; a second port 102;

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

a third port 201;

a first inner end cap 41;

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

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

a second outer end cap 44; an outer port 441; a second outer cannula 442;

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

a waterway partition plate 46;

a spacer bracket 49;

a second accommodation chamber 200; a second filter group 500; a spiral wound reverse osmosis membrane element 3; a center tube group 13;

fifth uniform flow channels 31; a reverse osmosis membrane bag 32; a central tube 33; a waste water header 34;

A fifth port 301; a fourth port 302;

A third end cap 47; a third outer cannula 471; a third inner cannula 472; a positioning protrusion 473;

A fourth end cap 48; a fourth cannula 481; a waste outlet 482;

A water stop assembly 50; a water stop structure concave table 51; a spring 52; a seal ring 53; a water stop structure 54; a restriction table 541;

A housing 300;

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

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

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

Detailed Description

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

A composite filter element assembly 1000 in accordance with an embodiment of the present invention is described below with reference to fig. 1-11.

As shown in fig. 1 and 3, a composite filter element assembly 1000 according to an embodiment of the present invention includes a housing 300, a first filter group 400, and a second filter group 500.

The housing 300 defines a first accommodating chamber 100 and a second accommodating chamber 200 therein, the first accommodating chamber 100 and the second accommodating chamber 200 are spaced apart by a transition plate 331, and the transition plate 331 is provided with a transition port 332, where the transition plate 331 enables the first accommodating chamber 100 and the second accommodating chamber 200 to form two generally spaced apart chambers in the housing 300, and the two chambers can be communicated through the transition port 332.

The first receiving chamber 100 is a low pressure chamber, and the second receiving chamber 200 is a high pressure chamber, where the low pressure and the high pressure are used for comparison and differentiation, i.e., the water pressure in the first receiving chamber 100 is lower than the water pressure in the second receiving chamber 200. The inner cavity of the shell 300 is divided into a first accommodating cavity 100 and a second accommodating cavity 200 by a transition plate 331, and the design can meet the requirements of different filtering structures on water pressure. For example, the filtration flow resistance in the first accommodating cavity 100 is small, so that the first accommodating cavity 100 is designed as a low-pressure cavity, the water purifying system does not need to configure a booster pump for the first accommodating cavity 100, the bearing pressure of the internal parts of the first accommodating cavity 100 and the corresponding connectors is small, and the assembly sealing reliability of the parts is low. The second accommodating chamber 200 has high filtration flow resistance, and the booster pump can be independently configured for the second accommodating chamber 200 at this time, and meanwhile, the bearing capacity of the internal parts of the second accommodating chamber 200 and the corresponding connecting pipes is ensured. The two parts are arranged separately, which is beneficial to reducing the cost.

The first filter group 400 is disposed in the first accommodating chamber 100, the second filter group 500 is disposed in the second accommodating chamber 200, and water in the second accommodating chamber 200 flows to the first accommodating chamber 100 through the transition port 332 after being filtered by the second filter group 500. That is, the first filter group 400 can perform the filtering function sufficiently in the low pressure chamber where the water pressure is relatively low, and the second filter group 500 needs to perform the filtering function sufficiently in the high pressure chamber where the water pressure is relatively high. Here, the water flow in the first receiving chamber 100 may flow to the second receiving chamber 200 through the transition port 332 after the purification, or the water flow in the second receiving chamber 200 may flow to the first receiving chamber 100 through the transition port 332 after the purification, which is not limited herein.

The first filter group 400 and the second filter group 500 are respectively distributed in different cavities, the first filter group 400 is arranged in the first accommodating cavity 100, and the second filter group 500 is arranged in the second accommodating cavity 200, compared with the mode that a group of filter pieces are arranged in each filter element shell in the prior art, each filter element is connected through an external pipeline, the invention reduces the arrangement of the external connecting pipeline to a certain extent, further reduces the external space required during installation, and saves the internal volume of a cabinet of a user; meanwhile, the overall attractive performance is enhanced.

According to the composite filter element assembly 1000 of the embodiment of the invention, the casing 300 is divided into the first accommodating cavity 100 and the second accommodating cavity 200 through the transition plate 331, so that the first filter group 400 and the second filter group 500 are separated, the first accommodating cavity 100 is set as a low-pressure cavity, the second accommodating cavity 200 is set as a high-pressure cavity, the structural requirement of the low-pressure cavity is reduced, the first filter group 400 which can be purified at relatively low pressure is concentrated in the low-pressure cavity, the second filter group 500 which needs higher water pressure is concentrated in the high-pressure cavity, the pipeline connection is reduced, the water leakage risk is reduced, the purifying and filtering effect is improved, the flow channel design is simple, the reliability is high, and the purifying and filtering effect is good.

In some embodiments of the present invention, as shown in fig. 1,2 and 4, a first inlet 101, a second inlet 102 and a third inlet 201 are provided on a housing 300, a first filter group 400 includes a first filter 10, a second filter 20 and a waterway partition 46, the waterway partition 46 is provided in a first accommodating chamber 100, the waterway partition 46 partitions the first accommodating chamber 100 into a first low pressure area 1 and a second low pressure area 2, the first filter 10 is provided in the first low pressure area 1, water flowing in from the first inlet 101 flows out from the second inlet 102 through the first filter 10, the second filter 20 is provided in the second low pressure area 2, and water flowing in from a transition port 332 flows out from the third inlet 201 through the second filter 20. That is, the waterway partition 46 separates the first filter member 10 and the second filter member 20 in the first receiving chamber 100 to form two independent purified waterways. And the transition port 332 is provided to connect the second receiving chamber 200 in series with one of the purge waterways of the first receiving chamber 100.

Optionally, other filter elements may be connected between the two sets of filter elements within the first receiving chamber 100; the water inlet of the first filter element 10 and the water outlet of the second filter element 20 can also be directly connected; or directly connects the water outlet of the first filter 10 and the water inlet of the second filter 20, so that the purified water paths between the first filter 10 and the second filter 20 are in a tandem relationship.

Alternatively, as shown in fig. 1, a first uniform distribution flow channel 11 is defined between the first filter element 10 and the inner wall of the first receiving chamber 100, and the first uniform distribution flow channel 11 is connected to the first inlet/outlet 101. Here, the first uniformly distributed flow channels 11 may uniformly distribute the liquid to be purified in the first filter element 10, or may uniformly distribute the purified liquid in the first filter element 10.

The waterway spacer plate 46 defines the second uniform flow path 12 with the first filter element 10. Here, when the liquid to be purified of the first filter element 10 is uniformly distributed in the first uniformly distributed flow channel 11, the purified liquid of the first filter element 10 is uniformly distributed in the second uniformly distributed flow channel 12; conversely, the same applies. The second uniform distribution flow channel 12 is connected with the second inlet and outlet 102. That is, when the first inlet/outlet 101 is an inlet, the second inlet/outlet 102 is an outlet; when the first inlet 101 is an outlet, the second inlet 102 is an inlet.

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

Optionally, as shown in fig. 1 and fig. 3, the first accommodating cavity 100 and the second accommodating cavity 200 are arranged at intervals in the axial direction, one of the uniformly distributed flow channels on both sides of the second filter element 20 is communicated with the second accommodating cavity 200 through a transition opening 332 on the transition plate 331, and the two accommodating cavities (100, 200) are matched compactly, so that an external connecting pipeline required to be paved when water filtered by the second filter group 500 flows to the second filter element 20 for filtering is saved; it is also possible to save the external connection pipes that the water filtered by the second filter element 20 needs to be laid when flowing to the second filter group 500 for filtering, which is beneficial to reducing the overall size of the composite filter element assembly 1000 and simplifying the arrangement of external pipelines.

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

In some embodiments of the present invention, as shown in fig. 3, the housing 300 includes: the bottle 330 and two bottle caps, the both ends of bottle 330 are opened, two bottle caps are cooperated at the both ends of bottle 330, each bottle cap is detachably connected on bottle 330 in a sealing way. Here, the detachable connection may be a threaded connection, that is, the end of the bottle body 330 and the bottle cap are provided with external threads, and the other is provided with matched internal threads, and a sealing ring may be provided between the internal threads and the external threads, so that the fastening effect may be enhanced, and the sealing effect may also be improved. The detachable connection may also be a snap connection, for example, a snap is provided at an end of the bottle body 330, and a snap hole is provided on the first bottle cap 310 and the second bottle cap 320 at two ends of the bottle body 330, so that the bottle body 330, the first bottle cap 310 and the second bottle cap 320 respectively form a snap connection relationship. Of course, other easily conceivable removable attachment means may be used in the present invention, without limitation.

Compared with the prior art that two groups of filter elements are integrated in one filter element assembly, the filter element assembly has higher integration level and stronger function. When the filter element is replaced, the corresponding filter element can be replaced only by disassembling different end parts of the shell 300 and corresponding end caps of the filter elements, the replacement is simple, the operation is easy, the possibility is provided for the client to replace in person, and the maintenance cost is reduced.

Even if the filter element in the accommodating cavity cannot be removed after being installed, as all the filter elements are arranged in the shell 300, only one set of positioning and installing structure is needed when the composite filter element assembly 1000 is integrally installed, and the assembly is simple and time-saving.

As shown in fig. 1 and 3, a transition port 332 penetrating in the thickness direction is provided in the middle of the transition plate 331. Optionally, when the bottle 330 is a plastic part, the transition plate 331 and the bottle 330 are integrally injection molded, the integral molding is convenient for processing and manufacturing, and the sealing connection between the transition plate 331 and the bottle 330 is very reliable, so that the transition plate 331 is prevented from deflecting in the bottle 330, leaking water and the like when the impact is applied or the pressure difference between two sides is too large. Of course, the transition plate 331 may be welded to the bottle 330, which is not limited herein. Whether integrally injection molded or welded, the pressure difference between the first accommodating cavity 100 and the second accommodating cavity 200 can be well borne, and high-pressure water in the second accommodating cavity 200 is prevented from penetrating into the first accommodating cavity 100 without passing through the transition port 332.

It should be noted that, the water pressure of the second filter group 500 is kept within a certain range during the purification and filtration. Because the water flow cannot pass through the second filter group 500 in a large amount if the water pressure is small, the purification amount is too low, and if the water pressure is large, the second filter group 500 is easily damaged. In some embodiments of the invention, the water pressure in the high pressure chamber is 0.7-0.85Mpa, i.e. the water pressure in the high pressure chamber is at least 0.7Mpa and at most 0.85Mpa. The water pressure in this range, where a higher water pressure is advantageous for the second filter group 500 to fully exert the filtering power, accelerating the membrane passing speed of the water flow. The water pressure of the high pressure chamber is greater than the municipal water supply pressure, and therefore, a booster pump is required to boost the pressure of the water as it flows to the high pressure chamber.

In some embodiments of the present invention, the water pressure in the low pressure chamber is less than or equal to the municipal water supply pressure, and the water can be directly received from the municipal water supply when the water is introduced into the first receiving chamber 100. In some embodiments of the invention the water pressure in the first low pressure zone 1 is 0.1-0.4MPa, i.e. the water pressure in the first low pressure zone 1 is at least 0.1MPa and at most 0.4MPa. The water pressure in this range is low and no booster pump boost is required.

In some examples of the present invention, as shown in fig. 1, 5, and 7, the water path partition 46 has a cylindrical shape, the second filter 20 is located inside the water path partition 46, and the first filter 10 is located outside the water path partition 46. Optionally, the first filter element 10 and the second filter element 20 are also cylindrical, the first filter element 10, the waterway partition 46 and the second filter element 20 are sleeved in sequence, and the central cavity of the second filter element 20 is the fourth uniform flow channel 22. Here, the fourth uniform flow channel 22 is in the center of the first filter group 400, which is cylindrical. The outer sides of the fourth uniform distribution flow channels 22 are respectively and compactly provided with a layer of second filter elements 20, a layer of third uniform distribution flow channels 21, a layer of waterway spacing plates 46, a layer of second uniform distribution flow channels 12, a layer of first filter elements 10 and a layer of first uniform distribution flow channels 11 in the radial direction, and the third uniform distribution flow channels 21 and the second uniform distribution flow channels 12 are isolated from flowing through the waterway spacing plates 46. The first receiving chamber 100 is compact in overall arrangement, occupies little installation space, and has high integration. The first filter member 10 and the second filter member 20 are conveniently installed.

In some embodiments, first filter group 400 includes a first outer end cap 42, first outer end cap 42 being sealingly connected to one end periphery of a spacer plate 46. Specifically, the first outer end cover 42 cooperates with the first filter element 10 to close the bottoms of the first filter element 10 and the second uniform distribution flow channels 12, and provides support for the first filter element 10, so as to effectively prevent liquid on two sides of the first filter element 10 from being in series at the bottom. The waterway spacer 46 is connected to the first outer end cover 42, which is favorable for the first outer end cover 42 to be firmly arranged at a specific position, so that the second uniform distribution flow channel 12 and the third uniform distribution flow channel 21 are reliably separated, and series flow and water quality reduction are avoided.

Alternatively, the waterway spacer plate 46 and the first outer end cover 42 are integrally formed, which may be easily manufactured. Gaps are unlikely to occur between the integrally formed rear waterway spacing plate 46 and the first outer end cover 42, and the position is more stable.

The end face of the first filter element 10 is glued to the first outer end cap 42. Thus, the assembly is convenient, and the installation of the integrated core is convenient. Optionally, the first filter element 10 is sealingly attached to the first outer end cap 42 by a bead of hot melt adhesive.

In some embodiments, as shown in fig. 1, the first filtering group 400 includes a second middle end cover 45, where the second middle end cover 45 is connected with the other end edge of the water path partition 46 in a sealing manner, and a second middle insertion pipe 452 is disposed on the second middle end cover 45, and the second middle insertion pipe 452 is connected with the casing 300 in a sealing manner, so as to avoid the second low pressure area 2 from being in series flow with the first low pressure area 1. Specifically, the second middle end cap 45 fixes the top of the first filter element 10, effectively preventing water flow on both sides of the first filter element 10 from being connected in series at the top. The waterway spacer 46 is coupled to the second middle end cap 45 to facilitate the first loading of the second filter element 20 into the second low pressure 2.

In some embodiments of the present invention, as shown in fig. 1 and 2, a fourth inlet 302 and a fifth inlet 301 are provided on the housing 300, and the second filter group 500 includes: the spiral wound type reverse osmosis membrane element 3, the spiral wound type reverse osmosis membrane element 3 includes: a central tube group 13 and a plurality of reverse osmosis membrane bags 32. The central tube stack 13 includes a central tube 33 and a plurality of spaced apart wastewater headers 34, the plurality of wastewater headers 34 being disposed around the central tube 33, the central tube 33 having a filtered water inlet opening in a wall thereof, the wastewater headers 34 having wastewater inlet openings in a wall thereof, the reverse osmosis membrane bags 32 having a first portion located inside the central tube stack 13 and a second portion located outside the central tube stack 13, each of the wastewater headers 34 and the central tube 33 being separated by a first portion of at least one reverse osmosis membrane bag 32, the second portions of the plurality of reverse osmosis membrane bags 32 forming a multi-layered membrane assembly around the central tube stack 13; wherein, the water entering the high-pressure chamber from the fourth inlet and outlet 302 flows to the filtered water inlet after being filtered by the reverse osmosis membrane bag 32, the waste water collecting pipe 34 is connected with the fifth inlet and outlet 301, and the central pipe 33 is connected with the transition port 332.

In some embodiments of the present invention, as shown in fig. 1, the reverse osmosis membrane bag 32 is rolled into a cylindrical shape, a fifth uniform flow channel 31 is defined between the reverse osmosis membrane bag 32 and the inner wall of the second receiving chamber 200, and the center of the reverse osmosis membrane bag 32 is disposed opposite to the transition port 332. In view of the arrangement of the spiral wound reverse osmosis membrane element 3 and the fifth uniform flow channel 31, most of the water flows pass through the spiral wound reverse osmosis membrane element 3 in the radial direction of the spiral wound reverse osmosis membrane element 3, and the pass-through 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. Most of water flows basically flow along the axial direction when the filter element is filled with water, so that the water flows are uniformly distributed, the washed impurities are brought to one axial end, and the impurities are prevented from being blocked on the surface of the filter element.

The water flowing into the fifth uniform flow channel 31 continuously permeates into the reverse osmosis membrane bag 32 while passing through the reverse osmosis membrane bag 32 in the radial direction and flowing toward the central tube 33. The purified water permeated into the reverse osmosis membrane bag 32 continues to flow toward the central tube 33 in the radial direction, and flows toward the central tube 33 in the spiral direction in part due to the membrane extending direction. Finally, the purified water enters the central tube 33 from the filtered water inlet and then flows toward the transition port 332. The water which does not permeate into the reverse osmosis membrane bag 32 is concentrated in the waste water header 34, the remaining waste water flows to the waste water collecting holes on the pipe wall of the waste water header 34, the waste water header 34 is connected with the fifth inlet and outlet 301, and the waste water is discharged from the fifth inlet and outlet 301. When water passes through the reverse osmosis membrane bags 32, the water passes through the reverse osmosis membrane bags 32 along the radial direction, the passing path is short, the circulation is large, the water has a scouring effect on impurities on the surfaces of the reverse osmosis membrane bags 32, and the water flow passes through the reverse osmosis membrane bags 32 after washing the impurities more easily.

In some embodiments of the present invention, as shown in fig. 1, the second filter group 500 further includes: the third end cover 47 and the fourth end cover 48, the third end cover 47 and the fourth end cover 48 are respectively connected to two axial ends of the spiral wound reverse osmosis membrane element 3, the third end cover 47 is arranged towards the transition plate 331, the central tube 33 is connected with the transition port 332 through the third end cover 47, and the waste water header 34 is connected with the fifth inlet and outlet 301 through the fourth end cover 48. As shown in fig. 1, two ends of the third end cover 47 are provided with a third external through cannula 471 and a third internal through cannula 472 which are communicated, the third external through cannula 471 is inserted into the transition port 332, and the third internal through cannula 472 is connected with the central tube 33. Here, the third end cap 47 closes the top of the spiral wound reverse osmosis membrane element 3 and provides a supporting connection of the top to the spiral wound reverse osmosis membrane element 3, effectively preventing the liquid in the spiral wound reverse osmosis membrane element 3 from being strung at the top.

The fourth end cap 48 closes the bottom of the spiral wound reverse osmosis membrane element 3 and provides sealing and support for the bottom of the spiral wound reverse osmosis membrane element 3, effectively preventing liquid in the spiral wound reverse osmosis membrane element 3 from flowing in series at the bottom. The waste header 34 communicates the waste outlet 482 with the fifth inlet 301 to allow high salinity waste water to flow out of the housing 300 quickly enough.

The third end cover 47 is inserted into the transition port 332 through the third external through cannula 471, so that on one hand, sealing is facilitated, high-pressure water in the second accommodating cavity 200 is prevented from flowing to the transition port 332 without being filtered by the spiral wound type reverse osmosis membrane element 3, on the other hand, positioning is performed by using the transition port 332, positioning accuracy is improved, and meanwhile, assembly difficulty is reduced.

The third end cover 47 is inserted on the central tube 33 through the third inner through insertion tube 472, on one hand, the surface contact between the third inner through 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. 1 and 8, the third end cover 47 is provided with a positioning protrusion 473, the positioning protrusion 473 is disposed corresponding to the waste water header 34, one end of the waste water header 34 is inserted on the positioning protrusion 473, the 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, the two axial ends of the circular cylinder from which the reverse osmosis membrane bag 32 is rolled are glued to the third end cap 47 and the fourth end cap 48. Thus, the assembly is convenient, and the installation of the integrated core is convenient.

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

The reverse osmosis membrane element adopts a side flow water-saving membrane, and improves the flow velocity of the surface of the membrane through side flow water inflow, thereby ensuring higher pure water recovery rate and longer service life of the membrane bag. The liquid needs to be pressurized in advance and pumped into the fourth inlet 302.

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

In some embodiments of the present invention, as shown in fig. 1, the composite filter element assembly 1000 further comprises: the first inner end cover 41 is fitted on the axial end surface of the second filter element 20 facing the transition port 332, so as to block the second filter element 20 and the fourth uniform distribution flow channels 22. The first inner end cap 41 here blocks the second filter element 20 and the fourth uniform distribution flow channel 22, and means that the first inner end cap 41 seals the axial end surfaces of the second filter element 20 and the fourth uniform distribution flow channel 22, so that water in the second filter element 20 and the fourth uniform distribution flow channel 22 cannot flow out or in from the axial end surfaces facing the transition port 332. The meaning of the end cap mentioned below is also the same when it plugs a filter element and a uniform flow channel, and will not be described in detail.

In fig. 1, the first inner end cover 41 closes the bottoms of the second filter element 20 and the fourth uniform distribution flow channel 22, and provides a bottom support for the second filter element 20, so that the liquid phase at the bottom of the second filter element 20 is effectively prevented from being in series, 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.

Optionally, as shown in fig. 1, the middle part 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, so that the third uniform distribution channel 21 is kept in communication with the transition port 332. That is, the water filtered by the second filter 20 may flow to the spiral wound type reverse osmosis membrane element 3 through the crossover 332, and be filtered again by the spiral wound type reverse osmosis membrane element 3; or the water filtered by the spiral wound type reverse osmosis membrane element 3 may flow to the second filter 20 through the transition port 332 and be filtered again by the second filter 20.

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

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

In some embodiments of the present invention, as shown in fig. 1, a first insertion tube 421 is provided on the first outer end cover 42, the first insertion tube 421 is inserted into the transition port 332, and the first insertion tube 421 is in sealing fit with the inner wall of the transition port 332. The first cannula 421 is inserted into the transition port 332, so that on the one hand, the transition port 332 is further closed, and unnecessary streaming of liquid between the first accommodating cavity 100 and the second accommodating cavity 200 is prevented; on the other hand, the flow path connection between the second filter element 20 and the spiral wound reverse osmosis membrane element 3 is made easier.

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

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

In some embodiments of the present invention, as shown in fig. 1, the composite filter element assembly 1000 further comprises: a second inner end cap 43 and a second outer end cap 44. The second inner end cover 43 is fitted on an axial end surface of the second filter element 20 far from the transition port 332 to block the second filter element 20, and an inner port 431 communicating with the third inlet 201 is provided on the second inner end cover 43. Here, the second inner end cover 43 closes the top of the second filter element 20, provides connection to the top of the second filter element 20, and provides a trend to the third inlet and outlet 201, so that the liquid to be purified on both sides of the second filter element 20 is effectively prevented from being in series with the purified liquid on the top, and the filtering effect of the second filter element 20 is further ensured. The fluid filtered by the second filter group 500 is collected in the fourth uniform distribution flow channel 22 and discharged outwards through the inner port 431.

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

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

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

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

In some examples, as shown in fig. 1, the first connection tube 311 and the second connection tube 312 are provided on the inner peripheral wall of the housing 300, and the inner end 431 of the second inner end cover 43 is connected to the first connection tube 311 in a plugging manner, and the outer end 441 of the second outer end cover 44 is connected to the second connection tube 312 in a plugging manner. This manner of fitting of the plug connection makes it very easy to fix the first filter insert and the second filter insert in the housing 300.

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

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

In the example of fig. 1 and4, a second inner cannula 432 is formed on the second inner end cap 43, and the orifice of the second inner cannula 432 forms the inner end 431 described above. The second inner cannula 432 may be inserted within the first adapter tube 311, and the second inner cannula 432 may also be inserted outside the first adapter tube 311. To improve the sealing effect, a sealing ring is provided between the second inner cannula 432 and the first adapter tube 311.

In the example shown in fig. 1 and 4, a second outer cannula 442 is formed on the second outer end cap 44, and the nozzle of the second outer cannula 442 forms the outer port 441. Second outer cannula 442 may be inserted within second nozzle 312, and second outer cannula 442 may also be inserted outside second nozzle 312. To enhance the sealing effect, a sealing ring is provided between the second outer cannula 442 and the second adapter tube 312.

In some examples, as shown in fig. 1 and 4, a third connection pipe 313 is provided on an inner peripheral wall of the housing 300, and the middle port 451 of the second middle cap 45 is connected with the third connection pipe 313 in a plugging manner.

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

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

The third connection pipe 313 is arranged on the shell 300, the third connection pipe 313 is connected with the middle port 451 in a plugging way, the step of fixing the end part of the waterway partition plate 46 is only in a plugging process, the assembly is very simple, the time is saved, and the reliability is high. In the example of fig. 1, a second middle cannula 452 is formed on the second middle end cap 45, and the orifice of the second middle cannula 452 forms the middle port 451 described above. The second middle cannula 452 may be inserted within the third nozzle 313, and the second middle cannula 452 may also be inserted outside the third nozzle 313. In order to improve the sealing effect, a sealing ring is arranged between the second middle insertion pipe 452 and the third connection pipe 313, and a sealing ring is also arranged between the second middle end cover 45 and the waterway partition plate 46.

In the example of fig. 1, the smaller distance between the second middle end cap 45 and the second outer end cap 44 enables a delicate balance of water pressure as the water flows through the first filter element 10. That is, when the water pressure inside the water path dividing plate 46 is greater than the water pressure outside, the second middle cap 45 may be pressed against the second outer cap 44, slowing down the filtering speed of the first filter 10. During normal operation, the water flow squeezes the second middle end cap 45 open, flowing normally toward the second access opening 102.

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

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

Optionally, as shown in fig. 1 and 4, the top of the second middle end cover 45, the second inner end cover 43 and the second outer end cover 44 are flush, which is beneficial for the capping of the top of the first containing cavity 100 by the first bottle cap 310.

In some examples of the present invention, as shown in fig. 1 and 4, a fourth connection tube 321 is provided on the inner peripheral wall of the housing 300, the fourth connection tube 321 is provided on the second bottle cap 320 in fig. 5, the fourth connection tube 321 is connected to the fifth inlet/outlet 301, a fourth insertion tube 481 is provided on the fourth end cap 48, and the fourth insertion tube 481 is connected to the fourth connection tube 321 in a plugging manner. The plug connection of the fourth cannula 481 with the fourth connecting tube 321 ensures that no series flow occurs between the high concentration waste liquid and the liquid to be purified. In addition, the fourth end cap 48 is ensured to be stably connected to the bottom of the housing 300, preventing the position of the spiral wound type reverse osmosis membrane element 3 from being changed during the filtration process.

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

In some specific examples, all the parts in the second receiving chamber 200 are preassembled as one piece, i.e., the spiral wound reverse osmosis membrane element 3, the wastewater header 34, the filtration membrane 32, the third end cap 47, the fourth end cap 48 are preconnected as an integrated RO membrane cartridge. Even the sealing rings at the transition port 332 and the fourth connecting tube 321 can be preassembled on the third outer through cannula 471 and the fourth cannula 481.

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

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

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

For a better understanding of aspects of embodiments of the present invention, the structure of a composite filter element assembly 1000 in one embodiment of the present invention is described below in conjunction with fig. 1-11.

The following embodiments illustrate the three stage filtration function of the composite filter element assembly 1000, and illustrate the highly integrated design of the composite filter element assembly 1000, taking purified tap water as an example. The first filter element 10 is exemplified by a roll-type primary filter element formed by rolling a nonwoven fabric, a polypropylene layer, carbon fibers, and a spacer bracket 49; the filtration membrane 32 is illustrated with a high water saving side stream reverse osmosis membrane as an intermediate filtration. The second filter element 20 is illustrated with a cylindrical hollow carbon rod as an example of a final stage filtration.

As shown in fig. 1,2,3 and 4, a composite filter element assembly 1000 is vertically disposed, and includes a housing 300, where the housing 300 includes a bottle body 330, a first bottle cap 310 and a second bottle cap 320, and each bottle cap is in threaded sealing connection with the bottle body 330, and a sealing member is disposed at the sealing position. The first bottle cap 310 is provided with a first inlet and outlet 101 for running water, a second inlet and outlet 102 for front water outlet and a third inlet and outlet 201 for drinking water outlet. The second bottle cap 320 is provided with a fourth inlet and outlet 302 for the front water of reverse osmosis and a fifth inlet and outlet 301 for the high salinity wastewater of reverse osmosis.

As shown in fig. 1, the water stop assembly 50 is provided at each of the fourth and fifth inlets 302 and 301. Taking the water stop assembly 50 at the fourth inlet and outlet 302 in fig. 3 as an example, the water stop assembly 50 includes a water stop structure recess 51, a spring 52, a seal ring 53 and a water stop structural member 54. The water stop structure concave table 51 is fixed in the second bottle cap 320, the water stop structure concave table 51 is opened towards the fourth inlet and outlet 302, and a through hole for water passing is formed in the water stop structure concave table 51. The water stop structure 54 is telescopically arranged in the water stop structure concave table 51, a part of the water stop structure 54 extends to the fourth inlet and outlet 302, a limiting table 541 is arranged on the water stop structure 54, and the diameter of the limiting table 541 is larger than that of the fourth inlet and outlet 302. The spring 52 is positioned in the water stop structure recess 51 and abuts against the water stop structure 54, so that the restriction table 541 has a tendency to protrude toward the fourth inlet/outlet 302. The sealing ring 53 is arranged on the water-stopping structural member 54, when the spring 52 can overcome the water flow pressure, the spring 52 stops the sealing ring 53 against the end face of the fourth inlet and outlet 302, so that the fourth inlet and outlet 302 is blocked. When the external connecting pipe is connected to the fourth inlet and outlet 302, a pin is provided on the external connecting pipe and inserted into the fourth inlet and outlet 302, so that the fourth inlet and outlet 302 is opened. Once the external connection pipe is pulled out from the fourth inlet and outlet 302, the fourth inlet and outlet 302 can be automatically closed by the water stop assembly 50. The water stop assembly 50 is arranged to facilitate the insertion of the composite filter element assembly 1000 into an external connecting tube.

As shown in fig. 1, the inside of the housing 300 is integrally formed with a transition plate 331 disposed perpendicular to the cylinder wall, and the transition plate 331 axially spaces the housing 300 to form the first accommodation chamber 100 and the second accommodation chamber 200. The middle part of the transition plate 331 is provided with a through transition port 332 along the axial direction.

As shown in fig. 1, two sets of nested filter units are provided in the first receiving chamber 100, the first filter 10 provided at the outer side serves as a primary filter unit, and the second filter 20 provided at the center of the first receiving chamber 100 serves as a final filter unit. The axial length of the first filter element 10 is greater than that of the second filter element 20, and the first filter element 10 and the second filter element 20 are separated by a cylindrical waterway partition 46. An annular first uniform distribution flow channel 11 is defined between the first filter element 10 and the inner wall of the first accommodating cavity 100, and the first uniform distribution flow channel 11 is connected with the first inlet and outlet 101. The waterway partition 46 and the first filter element 10 define an annular second uniform flow channel 12 therebetween, and the second uniform flow channel 12 is connected to the second inlet and outlet 102. The waterway partition plate 46 and the second filter element 20 define an annular third uniform distribution runner 21 therebetween, and a cylindrical fourth uniform distribution runner 22 is arranged on one side of the second filter element 20 away from the third uniform distribution runner 21. The third uniform distribution runner 21 is connected with a transition port 332, and the fourth uniform distribution runner 22 is connected with the third inlet and outlet 201.

As shown in fig. 1 and 4, the upper end of the second filter element 20 is provided with a second inner end cover 43, and the lower end of the second filter element 20 is provided with a first inner end cover 41; the second inner end cap 43 is fitted on the axial end face of the second filter element 20 remote from the transition opening 332. The upper end of the first filter element 10 is provided with a second outer end cover 44, the axial end surface of the first filter element 10 facing the transition port 332 is provided with a first outer end cover 42, and the first outer end cover 42 is integrally formed with a waterway spacing plate 46. A second middle end cover 45 is sleeved between the second outer end cover 44 and the second inner end cover 43, and the second middle end cover 45 is matched with the peripheral wall of the waterway partition plate 46. A sealing member is additionally arranged between the second middle end cover 45 and the third connecting pipe 313, and a sealing member is additionally arranged between the second inner end cover 43 and the first connecting pipe 311.

As shown in fig. 1 and 4, the first connection tube 311, the second connection tube 312 and the third connection tube 313 are arranged on the inner peripheral wall of the shell 300, the second middle end cover 45 is connected with the third connection tube 313 in a plugging manner, and a channel for connecting the second inlet and outlet 102 is formed between the third connection tube 313 and the second outer end cover 44.

As shown in fig. 1, a cylindrical third filter member 30 is provided in the second accommodation chamber 200. A fifth uniform flow channel 31 is defined between the third filter element 30 and the inner wall of the second accommodating cavity 200, and a central tube 33 in the center of the third filter element 30 is arranged opposite to the transition port 332. The wall of the central tube 33 is provided with a filtering water inlet, and the wall of the central tube 33 is provided with a filtering membrane 32. The filtration membrane is a reverse osmosis membrane bag 32, the reverse osmosis membrane bag 32 having a first portion and a second portion, each of the wastewater header 34 and the central tube 33 being separated by the first portion of at least one reverse osmosis membrane bag 32, the second portion of the plurality of reverse osmosis membrane bags 32 being formed around the central tube 33 and the tube stack of the plurality of wastewater headers 34 to form a multi-layered spiral wound membrane module.

As shown in fig. 9 and 11, the center tube 33 is formed in a ring shape and provided with five waste water headers 34, each waste water header 34 is connected to the fifth inlet/outlet 301 through the second end cap 320, and each waste water header 34 corresponds to one membrane bag. Pure water in the membrane bag enters the central tube 33 through the filtered water inlet, and wastewater outside the membrane bag enters the wastewater header 34 through the wastewater inlet.

As shown in fig. 1, 4,5, 8, 9 and 10, the spiral wound reverse osmosis membrane element 3 is provided with a third end cover 47 and a fourth end cover 48 at two ends thereof, the third end cover 47 is sealed at one end of the third filter channel 32 and the waste water circulation chamber facing the first filter unit 100, and the fourth end cover 48 is sealed at one end of the third filter channel 32 and the filtered water circulation chamber away from the first filter unit 100. The two ends of the third end cover 47 are provided with a third outer through cannula 471 and a third inner through cannula 472 which are communicated, the third outer through cannula 471 is inserted into the transition port 332, and the third inner through cannula 472 is connected with the central tube 33. The third end cap 47 is provided with a positioning protrusion 473 for foolproof engagement with the waste pipe 34. The positioning protrusion 473 may be inserted into the upper end of the waste water header 34 to block the upper end of the waste water header 34 so that waste water flows out of the lower end of the waste water header 34. The fourth end cap 48 is provided with a waste outlet 482 connected to the waste header 34. The shell 300 is provided with a fourth connecting pipe 321, the fourth connecting pipe 321 is communicated with the fifth inlet and outlet 301, the fourth end cover 48 is provided with a fourth insertion pipe 481, and the fourth insertion pipe 481 is connected with the fourth connecting pipe 321 in an inserting way. The fourth end cap 48 is provided with a block (not shown) in sealing engagement with the central tube 33. A sealing ring is additionally arranged between the third end cover 47 and the first outer end cover 42, and a sealing ring is additionally arranged between the first outer end cover 42 and the transition port 332. The outer peripheral edges of the third end cover 47 and the fourth end cover 48 are provided with fixed shaft bulges which can be matched with the inner wall of the bottle body 330 to limit the relative sliding between the third end cover 47 and the bottle body 330 and the fourth end cover 48, thereby limiting the relative sliding between the spiral wound reverse osmosis membrane element 3 and the bottle body 330.

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

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

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

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

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

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

Claims

1. A composite filter element assembly, comprising:

the device comprises a shell, wherein a first accommodating cavity and a second accommodating cavity are defined in the shell, the first accommodating cavity and the second accommodating cavity are separated by a transition plate, a transition opening is formed in the transition plate, the first accommodating cavity is a low-pressure cavity, the second accommodating cavity is a high-pressure cavity, and the water pressure in the first accommodating cavity is lower than the water pressure in the second accommodating cavity;

the first filter group is arranged in the first accommodating cavity;

the second filter group is arranged in the second accommodating cavity, and water in the second accommodating cavity flows to the first accommodating cavity through the transition port after being filtered by the second filter group;

The shell is provided with a first inlet and outlet, a second inlet and outlet and a third inlet and outlet, the first filtering group comprises a first filtering piece, a second filtering piece and a waterway partition plate, the waterway partition plate is arranged in the first accommodating cavity, the waterway partition plate partitions the first accommodating cavity into a first low-pressure area and a second low-pressure area, the first filtering piece is arranged in the first low-pressure area, water flowing in from the first inlet and outlet flows out from the second inlet and outlet after passing through the first filtering piece, the second filtering piece is arranged in the second low-pressure area, and water flowing in from the transition port flows out from the third inlet and outlet after passing through the second filtering piece;

the central cavity of the second filter element is a fourth uniform distribution runner, the composite filter element assembly further comprises a first inner end cover, and the first inner end cover is matched with the axial end face of the second filter element, which faces the transition port, so as to block the second filter element and the fourth uniform distribution runner.

2. The composite filter element assembly of claim 1, wherein the water pressure in the high pressure chamber is 0.7-0.85MPa.

3. The composite filter element assembly of claim 1, wherein the low pressure chamber water pressure is less than or equal to municipal water supply pressure.

4. The composite filter element assembly of claim 1, wherein the water pressure in the first low pressure zone is between 0.1 MPa and 0.4MPa.

5. The composite filter element assembly of claim 1, wherein the waterway spacer plate is cylindrical, the second filter element is positioned inside the waterway spacer plate, and the first filter element is positioned outside the waterway spacer plate; the first filtering group comprises a first outer end cover, the first outer end cover is in sealing connection with one end periphery of the waterway partition plate, a first insertion pipe which is communicated with the second low-pressure area is arranged on the first outer end cover, the first insertion pipe is connected with the transition plate, and a first sealing piece is arranged between the first insertion pipe and the transition plate so as to prevent streaming of the high-pressure cavity and the first low-pressure area.

6. The composite filter element assembly of claim 5, wherein the first filter group comprises a second middle end cap sealingly connected to the other end periphery of the waterway spacer, the second middle end cap having a second middle cannula disposed thereon, the second middle cannula sealingly connected to the housing to avoid series flow between the second low pressure zone and the first low pressure zone.

7. The composite filter element assembly of claim 1, wherein the housing is provided with a fourth inlet and a fifth inlet,

The second filter group includes: a spiral wound reverse osmosis membrane element, the spiral wound reverse osmosis membrane element comprising: the device comprises a central tube group and a plurality of reverse osmosis membrane bags, wherein the central tube group comprises a central tube and a plurality of waste water headers which are arranged at intervals, the waste water headers are arranged around the central tube, a filtering water inlet is formed in the wall of the central tube, and a waste water inlet is formed in the wall of the waste water header;

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

The 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 waste water collecting pipe is connected with the fifth inlet and outlet, and the central pipe is connected with the transition port.

8. The composite filter element assembly of claim 7, wherein the second filter group further comprises: the third end cover and the fourth end cover are respectively connected to the two axial ends of the spiral wound reverse osmosis membrane element, the third end cover faces towards the transition plate, the central tube is connected with the transition port through the third end cover, and the wastewater collecting tube is connected with the fifth inlet and outlet through the fourth end cover.

9. The composite filter element assembly of claim 8, wherein the reverse osmosis membrane bag rolled circular cartridge is glued on both axial ends to the third and fourth end caps.