CN111115876A

CN111115876A - Composite filter element assembly

Info

Publication number: CN111115876A
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: 2020-05-08

Abstract

The invention discloses a composite filter element assembly, which comprises: casing, first filtration group and second filtration group, inject first chamber and the second of holding in the casing and hold the chamber, first chamber and the second of holding holds through the cab apron spaced apart between the chamber, is equipped with the ferry mouth on the cab apron, and first chamber of holding is the low pressure chamber, and the second holds the chamber and is the high pressure chamber, and first filtration group establishes at first intracavity that holds, and the second filtration group establishes at the second and holds the intracavity, and the second holds intracavity water and filters the back through the second filtration group, and the chamber is first held to the process ferry mouth flow direction. 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 under low pressure is separated from the second filter group which can be purified and filtered only under high pressure, the pipeline connection is reduced, the water leakage risk is reduced, the purification and filtration effect is improved, the reliability is high, and the purification and filtration 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

The tap water delivered to each user from a municipal water plant will typically contain a certain amount of salt ions, metallic substances, chlorides, microorganisms, silt, etc. In order to improve the drinking water quality, more and more families choose to install water purifiers on the water outlet pipe of tap water, and the water purifiers are internally provided with multifunctional filter elements so as to remove different types of harmful substances in the tap water.

Generally, current purifier filter core is generally 3 ~ 4 grades, and some producer's purifier filter core is two cores. In order to improve the filter effect of compound filter element group spare, arrange multiple filter element group spare in the water purifier usually, advance between each filter element group spare, the delivery port is established ties in proper order, the filter core both sides of difference form the cavity of intaking respectively, go out the water cavity, in order to reach the drinking water of high-quality, often need establish ties threely, level four filter element group spare, all need outside pipeline to connect between delivery port and the water inlet between the different filter element group spares, it is numerous and diverse to make compound filter element group spare pipe-line system, water purifier complete machine occupation space is great, inconvenient installation and renew cartridge.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention aims to provide the composite filter element assembly which reduces the pipeline connection, reduces the water leakage risk, 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 port is formed in the transition plate, the first accommodating cavity is a low-pressure cavity, the second accommodating cavity is a high-pressure cavity, the water pressure in the first accommodating cavity is lower than that 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.

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 as the low-pressure cavity, the second accommodating cavity is set as the high-pressure cavity, the structural requirement of the low-pressure cavity is reduced, the first filtering group for purifying filtered water can be arranged in the low-pressure cavity at relatively low pressure, the second filtering group requiring 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 effects are improved, the flow channel design is simple, the reliability is high, and the purifying and filtering effects are 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 outlet, a second inlet and outlet, and a third inlet and outlet, the first filter group includes a first filter element, a second filter element, and a water path partition plate, the water path partition plate is disposed in the first accommodating chamber, the water path partition plate partitions the first accommodating chamber into a first low-pressure region and a second low-pressure region, the first filter element is disposed in the first low-pressure region, water flowing from the first inlet and outlet flows out from the second inlet and outlet after passing through the first filter element, the second filter element is disposed in the second low-pressure region, and water flowing from the transition port flows out from the third inlet and outlet after passing through the second filter element.

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

In some embodiments of the invention, the water pressure in the low-pressure chamber is less than or equal to the municipal water supply pressure.

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

Optionally, the waterway partition plate is cylindrical, the second filter member is located inside the waterway partition plate, and the first filter member is located outside the waterway partition plate; the first filtering group comprises a first outer end cover, the first outer end cover is connected with one end periphery of the water channel partition plate in a sealing mode, a first inserting pipe communicated with the second low-pressure area is arranged on the first outer end cover, the first inserting pipe is connected with the transition plate, and a first sealing element is arranged between the first inserting pipe and the transition plate to prevent the high-pressure cavity and the first low-pressure area from streaming.

In some examples of the present invention, the first filter group includes a second middle end cap, the second middle end cap is connected with the other end periphery of the waterway partition plate in a sealing manner, a second middle insertion pipe is arranged 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 the second low-pressure area from being in series flow with the first low-pressure area.

In some embodiments of the present invention, the housing is provided with a fourth inlet/outlet and a fifth inlet/outlet, and the second filter group includes: a spiral wound reverse osmosis membrane element comprising: the reverse osmosis membrane water purifier 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 collecting tubes arranged at intervals, the waste water collecting tubes are arranged around the central tube, filter water inlet holes are formed in the tube wall of the central tube, and waste water inlet holes are formed in the tube wall of the waste water collecting tubes; said reverse osmosis membrane bags having a first portion located inside said central tube bank and a second portion located outside said central tube bank, each said waste header and said central tube being separated by at least a first portion of said reverse osmosis membrane bags, said second portions of a plurality of said reverse osmosis membrane bags forming a multi-layer membrane module around the circumference of said central tube bank; the water entering the high-pressure cavity from the fourth inlet and outlet flows to the filtered water inlet hole after being filtered by the reverse osmosis membrane bag, the wastewater header 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 set further comprises: the third end cover and the fourth end cover are respectively connected to the two axial ends of the spiral roll type reverse osmosis membrane element, the third end cover faces the transition plate, the central pipe is connected with the transition hole through the third end cover, and the waste water pipe is connected with the fifth inlet and the fifth outlet through the fourth end cover.

Optionally, two axial ends of the rolled circular cylinder of the reverse osmosis membrane bag are glued to 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 above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

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

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

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

FIG. 4 is a schematic illustration of the internal construction of a composite filter cartridge assembly of one embodiment of the present invention with the first filter stack and the second filter stack omitted;

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

FIG. 6 is a schematic diagram of a bottle body with a composite filter element assembly according to one embodiment of the present invention;

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

FIG. 8 is a bottom view of a fourth endcap of one embodiment of the present invention;

FIG. 9 is a schematic perspective view of a central tube and waste header in accordance with one embodiment of the present invention;

FIG. 10 is a top view of a combination of a reverse osmosis membrane and a center tube and a waste water header according to an embodiment of the present invention;

FIG. 11 is a top view of a spiral wound reverse osmosis membrane element according to one embodiment of the invention.

Reference numerals:

a composite filter element assembly 1000;

a first accommodation chamber 100; a first filter bank 400; a first low-pressure region 1; a second low-pressure region 2;

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

a first port 101; a second port 102;

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

a third inlet and outlet 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;

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

fifth evenly distributed runners 31; a reverse osmosis membrane bag 32; a center tube 33; a waste water header 34;

a fifth port 301; a fourth port 302;

a third end cap 47; a third externally-through cannula 471; a third inner cannula 472; a positioning projection 473;

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

a water stop assembly 50; a water stop structure recessed platform 51; a spring 52; a seal ring 53; a water stop structure 54; a restraint stage 541;

a housing 300;

a first cap 310; a first adapter 311; a second adapter 312; a third adapter 313;

a second bottle cap 320; the fourth adapter 321;

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

Detailed Description

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

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

As shown in fig. 1 and 3, a composite filter cartridge 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 separated by a transition plate 331, the transition plate 331 is provided with a transition port 332, here, the transition plate 331 makes the first accommodating chamber 100 and the second accommodating chamber 200 form two generally separated chambers in the housing 300, and the two chambers can be communicated with each other through the transition port 332.

The first accommodating chamber 100 is a low pressure chamber, and the second accommodating chamber 200 is a high pressure chamber, where the low pressure and the high pressure are used for comparison, that is, the water pressure in the first accommodating chamber 100 is lower than the water pressure in the second accommodating chamber 200. The inner cavity of the housing 300 is divided into a first accommodating chamber 100 and a second accommodating chamber 200 by a transition plate 331, which are designed to meet the requirements of different filter structures on water pressure. For example, the filtering flow resistance in the first accommodating chamber 100 is small, so that the first accommodating chamber 100 is designed to be a low-pressure chamber, the water purification system does not need to configure a booster pump for the first accommodating chamber 100, the pressure bearing of the internal parts and corresponding joints of the first accommodating chamber 100 is small, and the requirement on the reliability of part assembly and sealing is low. And the filtration circulation resistance in the second accommodating cavity 200 is large, at this time, a booster pump can be separately configured for the second accommodating cavity 200, and the pressure bearing capacity of the internal parts of the second accommodating cavity 200 and the corresponding connecting pipes is ensured. The separated arrangement is beneficial to reducing the cost.

The first filtering set 400 is arranged in the first accommodating cavity 100, the second filtering set 500 is arranged in the second accommodating cavity 200, and water in the second accommodating cavity 200 is filtered by the second filtering set 500 and then flows to the first accommodating cavity 100 through the transition port 332. That is, the first filter group 400 can perform a filtering function in a low pressure chamber having a relatively low water pressure, and the second filter group 500 requires a high pressure chamber having a relatively high water pressure to perform a filtering function. Here, the water in the first accommodating chamber 100 may flow to the second accommodating chamber 200 through the transition port 332 after being purified, or the water in the second accommodating chamber 200 may flow to the first accommodating chamber 100 through the transition port 332 after being purified, which is not limited herein.

Compared with the prior art that a group of filter elements are arranged in each filter element shell and are connected through an external pipeline, the invention reduces the arrangement of external connecting pipelines 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 integral aesthetic property 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 by the transition plate 331, so that the first filter element 400 and the second filter element 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 element 400 which can be purified at relatively low pressure is concentrated in the low-pressure cavity, the second filter element 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 purification and filtration effects are improved, the flow channel design is simple, the reliability is high, and the purification and filtration effects are good.

In some embodiments of the present invention, as shown in fig. 1, 2 and 4, the housing 300 is provided with a first inlet/outlet 101, a second inlet/outlet 102 and a third inlet/outlet 201, the first filter group 400 includes a first filter element 10, a second filter element 20 and a water path partition plate 46, the water path partition plate 46 is disposed in the first accommodation chamber 100, the water path partition plate 46 partitions the first accommodation chamber 100 into a first low pressure region 1 and a second low pressure region 2, the first filter element 10 is disposed in the first low pressure region 1, water flowing from the first inlet/outlet 101 flows out from the second inlet/outlet 102 through the first filter element 10, and the second filter element 20 is disposed in the second low pressure region 2, and water flowing from the transition port 332 flows out from the third inlet/outlet 201 through the second filter element 20. That is, the waterway spacer 46 is spaced apart from the first filter member 10 and the second filter member 20 in the first receiving chamber 100 to form two independent purification waterways. And the transition port 332 is arranged to connect the second accommodating chamber 200 in series with one of the purified water paths of the first accommodating chamber 100.

Optionally, in the first containing cavity 100, other filter members can be connected between the two groups of filter members; it is also possible to directly connect the inlet of the first filter element 10 to the outlet of the second filter element 20; or directly connecting the water outlet of the first filter element 10 with the water inlet of the second filter element 20, so that the purifying water path between the first filter element 10 and the second filter element 20 is in a front-rear series relationship.

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

The second uniform flow channel 12 is defined between the water path partition plate 46 and the first filter member 10. Here, when the liquid to be purified of the first filtering element 10 is uniformly distributed in the first uniform distribution flow passage 11, the liquid purified by the first filtering element 10 is uniformly distributed in the second uniform distribution flow passage 12; conversely, the same may be true. The second equispaced flow passages 12 are connected to the second inlet/outlet 102. That is, when the first inlet/outlet 101 is an inlet, the second inlet/outlet 102 is an outlet; when the first port 101 is an outlet, the second port 102 is an inlet.

A third uniform flow channel 21 is defined between the water channel partition plate 46 and the second filtering piece 20, a fourth uniform flow channel 22 is arranged on one side of the second filtering piece 20 far away from the third uniform flow channel 21, one of the third uniform flow channel 21 and the fourth uniform flow channel 22 is connected with the third inlet/outlet port 201, and the other one of the third uniform flow channel 21 and the fourth uniform flow channel 22 is connected with the transition port 332. Here, when the third equispaced flow channels 21 are connected to the transition port 332, the fourth equispaced flow channels 22 are connected to the third inlet and outlet ports 201; when the third equispaced flow channels 21 are connected to the third inlet and outlet ports 201, the fourth equispaced flow channels 22 are connected to the transition port 332.

Optionally, as shown in fig. 1 and fig. 3, the first accommodating cavity 100 and the second accommodating cavity 200 are axially spaced apart, one of the uniformly distributed flow paths on both sides of the second filter element 20 is communicated with the second accommodating cavity 200 through the transition port 332 on the transition plate 331, and the two accommodating cavities (100, 200) are compactly matched, so that an external connecting pipeline required to be laid when water filtered by the second filter group 500 flows to the second filter element 20 for filtering is saved; or, the external connecting pipeline required to be laid when the water filtered by the second filter element 20 flows to the second filter group 500 for filtering is saved, 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 flow channel 11, the second uniform flow channel 12, the third uniform flow channel 21 and the fourth uniform flow channel 22, when the water flow passes through the first filter element 10 and the second filter element 20, most of the water flow passes through the first accommodating cavity 100 along the radial direction, the passing path is short, and the flow volume is large. And the impurities on the surface of the filter piece are washed when the water flows through the filter piece in the radial direction, and the water flows through the filter piece after the impurities are more easily washed away. Most of water flow of each filter element flows along the axial direction basically when water enters and exits, so that the uniform distribution of the water flow is facilitated, and the impurities washed away are brought to the axial end part, so that 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: a bottle body 330 and two bottle caps, both ends of the bottle body 330 are opened, the two bottle caps are fitted to both ends of the bottle body 330, and each bottle cap is detachably and hermetically connected to the bottle body 330. Here, detachably connects and can be threaded connection, and one sets up the external screw thread on the tip of bottle 330 and the bottle lid promptly, and another sets up matched with internal thread, can be equipped with the sealing washer between internal thread and external screw thread, can strengthen the fastening effect, also can improve sealed effect. The detachable connection may also be a snap connection, for example, a snap is provided at the end of the bottle body 330, and snap holes are provided on the first bottle cap 310 and the second bottle cap 320 at the two ends of the bottle body 330, so that the bottle body 330 and the first bottle cap 310 and the second bottle cap 320 form a snap connection respectively. Of course, other conceivable detachable connection means can be used in the present invention, and are not limited herein.

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, only the different ends of the shell 300 need to be detached, and the sealing ends corresponding to the filtering pieces are required to be detached, so that the corresponding filtering pieces can be replaced, the replacement is simple, the operation is easy, the possibility of replacing the filtering pieces by customers is provided, and the maintenance cost is reduced.

Even if can not tear out after holding intracavity filter piece installation, nevertheless because all filter all set up in casing 300, only need one set of location, mounting structure when compound filter element group spare 1000 integral erection, the assembly is simple, save time.

As shown in fig. 1 and 3, a transition port 332 penetrating in the thickness direction is provided at the middle of the transition plate 331. Optionally, when the bottle body 330 is a plastic part, the transition plate 331 and the bottle body 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 body 330 is very reliable, so as to avoid the transition plate 331 deflecting, leaking water and the like in the bottle body 330 when the bottle body 330 is impacted by force or the pressure difference between the two sides is too large. Of course, the transition plate 331 can also be welded to the bottle body 330, without limitation. No matter the integral injection molding or welding connection is adopted, the pressure difference between the first accommodating cavity 100 and the second accommodating cavity 200 can be well borne, and the phenomenon that high-pressure water in the second accommodating cavity 200 permeates into the first accommodating cavity 100 without passing through the transition opening 332 is avoided.

It should be noted that the water pressure in the second filtering set 500 is kept within a certain range during the purification filtering. Since if the water pressure is small, the water flow cannot pass through the second filter group 500 in a large amount, which results in a low purification amount, the second filter group 500 is easily damaged if the water pressure is large. In some embodiments of the present 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 not lower than 0.7Mpa at the lowest and not higher than 0.85Mpa at the highest. Within this range, the higher water pressure is beneficial for the second filtering set 500 to exert the filtering flux sufficiently, and the water flow speed is increased. The water pressure in the high pressure chamber is greater than the municipal water supply pressure, and therefore, a booster pump is required to boost the pressure as water 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 water can be directly received from the municipal water supply when water enters the first accommodating 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 0.4 MPa. The water pressure in this range is low and does not require booster pumps for pressurization.

In some examples of the present invention, as shown in fig. 1, 5, and 7, the water path partition plate 46 has a cylindrical shape, the second filter member 20 is located inside the water path partition plate 46, and the first filter member 10 is located outside the water path partition plate 46. Optionally, the first filter element 10 and the second filter element 20 are also cylindrical, the first filter element 10, the water path partition plate 46 and the second filter element 20 are sequentially sleeved, and the central cavity of the second filter element 20 is the fourth uniform flow passage 22. Here, the fourth equispaced flow channels 22 are in the center of the first filter group 400, which is cylindrical. The outer side of the fourth uniform flow channel 22 is respectively compactly provided with a layer of second filtering piece 20, a layer of third uniform flow channel 21, a layer of water channel partition plate 46, a layer of second uniform flow channel 12, a layer of first filtering piece 10 and a layer of first uniform flow channel 11 in the radial direction, and the third uniform flow channel 21 and the second uniform flow channel 12 are isolated from each other through the water channel partition plate 46 and do not circulate. The first accommodating chamber 100 is compact in overall arrangement, occupies a small installation space, and has high integration level. The first filter member 10 and the second filter member 20 are conveniently installed.

In some embodiments, first filter pack 400 includes a first outer end cap 42, and first outer end cap 42 is sealingly coupled to an end perimeter of waterway spacer plate 46. Specifically, first outer end cover 42 and the first cooperation of straining piece 10 have closed the bottom of first straining piece 10, second equipartition runner 12, and for first straining piece 10 provides the support, prevent effectively that first straining piece 10 both sides liquid from bunching mutually in the bottom. The water passage partition plate 46 is connected to the first outer end cover 42, which is beneficial 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 isolation plate 46 and the first outer end cover 42 are integrally formed, so that the processing and manufacturing are convenient. After the integrated forming, a gap is not easy to appear between the waterway partition 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 ring of hot melt adhesive.

In some embodiments, as shown in fig. 1, the first filter group 400 includes a second middle end cap 45, the second middle end cap 45 is connected with the other end of the waterway partition plate 46 in a sealing manner, a second middle insertion tube 452 is arranged on the second middle end cap 45, and the second middle insertion tube 452 is connected with the housing 300 in a sealing manner, so as to prevent the second low-pressure region 2 from being in series with the first low-pressure region 1. Specifically, the second middle end cap 45 secures the top of the first filter element 10, effectively preventing water flow across the first filter element 10 from connecting in series at the top. The water passage partition 46 is connected to the second middle end cap 45, which facilitates the first installation of the second filter member 20 into the second low pressure 2.

In some embodiments of the present invention, as shown in fig. 1 and 2, the housing 300 is provided with a fourth access opening 302 and a fifth access opening 301, and the second filter group 500 includes: spiral wound reverse osmosis membrane element 3, spiral wound reverse osmosis membrane element 3 comprising: a center tube group 13 and a plurality of reverse osmosis membrane bags 32. The central tube group 13 comprises a central tube 33 and a plurality of waste water headers 34 arranged at intervals, the plurality of waste water headers 34 are arranged around the central tube 33, filter water inlet holes are arranged on the tube wall of the central tube 33, waste water inlet holes are arranged on the tube wall of the waste water headers 34, the reverse osmosis membrane bags 32 are provided with a first part positioned inside the central tube group 13 and a second part positioned outside the central tube group 13, each waste water header 34 and the central tube 33 are separated by the first part of at least one reverse osmosis membrane bag 32, and the second parts of the plurality of reverse osmosis membrane bags 32 form a multi-layer membrane module around the central tube group 13; wherein, the water entering the high pressure chamber from the fourth inlet/outlet 302 is filtered by the reverse osmosis membrane bag 32 and flows to the filtered water inlet hole, the waste water header 34 is connected with the fifth inlet/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 accommodating chamber 200, and the center of the reverse osmosis membrane bag 32 is disposed opposite to the transition port 332. From the layout of the spiral wound reverse osmosis membrane element 3 and the fifth uniform flow channel 31, most of the water flow passes through the spiral wound reverse osmosis membrane element 3 along the radial direction of the spiral wound reverse osmosis membrane element 3, and the passing path is short and the flow rate is large. And the impurities on the surface of the filter piece are washed when the water flows through the filter piece in the radial direction, and the water flows through the filter piece after the impurities are more easily washed away. Most of water flow of the filtering piece flows along the axial direction basically when water enters the filtering piece, so that the uniform distribution of the water flow is facilitated, and the impurities washed away are brought to one end of the axial direction, so that the impurities are prevented from being blocked on the surface of the filtering piece.

The water flowing into the fifth uniform flow passage 31 continuously permeates into the reverse osmosis membrane bag 32 while flowing in a direction radially through the reverse osmosis membrane bag 32 and toward the central tube 33. The purified water permeated into the reverse osmosis membrane bag 32 partially continues to flow toward the central tube 33 in the radial direction and partially flows toward the central tube 33 in a spiral direction by being influenced by the extending direction of the membrane. Eventually purified water enters the center tube 33 from the filtered water access hole and then flows toward the transition 332. The water that does not permeate into the reverse osmosis membrane bag 32 is collected at the waste water collecting pipe 34, the remaining waste water flows to the waste water collecting hole on the pipe wall of the waste water collecting pipe 34, and the waste water collecting pipe 34 is connected with the fifth inlet and outlet 301, and the waste water is discharged from the fifth inlet and outlet 301. When water passes through the reverse osmosis membrane bag 32, the water passes through the reverse osmosis membrane bag 32 along the radial direction, the passing path is short, the circulation is large, the impurities on the surface of the reverse osmosis membrane bag 32 are scoured, and the water flow can more easily scour the impurities and then passes through the reverse osmosis membrane bag 32.

In some embodiments of the present invention, as shown in fig. 1, second filter bank 500 further comprises: and a third end cap 47 and a fourth end cap 48, wherein the third end cap 47 and the fourth end cap 48 are respectively connected to the two axial ends of the spiral wound reverse osmosis membrane element 3, the third end cap 47 is arranged towards the transition plate 331, the central pipe 33 is connected with the transition port 332 through the third end cap 47, and the waste water header 34 is connected with the fifth inlet/outlet 301 through the fourth end cap 48. As shown in fig. 1, the third end cap 47 has a third outer insertion tube 471 and a third inner insertion tube 472 communicating with each other at both ends, the third outer insertion tube 471 is inserted into the transition port 332, and the third inner insertion tube 472 is connected to 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 for the spiral wound reverse osmosis membrane element 3, effectively preventing liquid in the spiral wound reverse osmosis membrane element 3 from crossing at the top.

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

The third end cap 47 is inserted into the transition port 332 through the third outer insertion tube 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 reverse osmosis membrane element 3, on the other hand, the transition port 332 is used for positioning, the positioning accuracy is improved, and meanwhile, the assembling difficulty can be reduced.

The third end cover 47 is inserted into the central tube 33 through the third inner through insertion tube 472, so that on one hand, the sealing is realized by using the surface contact between the third inner through insertion tube 472 and the tube wall of the central tube 33, on the other hand, the positioning and the installation of the central tube 33 are convenient, and the central tube 33 is prevented from being inclined and leaking water after long-term use.

In addition, as shown in fig. 1 and 8, the third end cap 47 is provided with a positioning protrusion 473, the positioning protrusion 473 is arranged corresponding to the waste water header 34, one end of the waste water header 34 is inserted into the positioning protrusion 473, and the positioning protrusion 473 has a certain fool-proof matching function, so that the third end cap 47 and the waste water header 34 can be conveniently positioned and installed, and the waste water header 34 can be prevented from being inclined after long-term use.

Alternatively, both axial ends of the rolled-out circular tube of the reverse osmosis membrane bag 32 are glued to the third and fourth end caps 47 and 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 insertion tube 471 and the transition port 332.

The reverse osmosis membrane element adopts a lateral flow water-saving film, and the surface flow rate of the membrane is improved by lateral inflow, so that the higher pure water recovery rate is ensured, and the longer service life of the membrane bag is prolonged. The liquid needs to be pressurized in advance and then pumped into the fourth port 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 described features, whether sequential or not.

In some embodiments of the present invention, as shown in FIG. 1, the composite filter element assembly 1000 further comprises: a first inner end cap 41, the first inner end cap 41 is fitted on the axial end face of the second filter member 20 facing the transition port 332 to block the second filter member 20 and the fourth uniform flow channels 22. The first inner end cap 41 is used to block the second filter element 20 and the fourth uniform flow channel 22, which means that the first inner end cap 41 seals the axial end surface of the second filter element 20 and the fourth uniform flow channel 22, so that the water in the second filter element 20 and the fourth uniform flow channel 22 cannot flow out or in from the axial end surface facing the transition port 332. When a certain end cover mentioned below blocks a certain filter element and a certain uniformly distributed flow passage, the meanings are the same, and the description is omitted.

In fig. 1, the first inner end cap 41 closes the bottom of the second filter element 20 and the fourth uniform flow channel 22, and provides bottom support for the second filter element 20, thereby effectively preventing the liquid at the bottom of the second filter element 20 from crossing, and ensuring the filtering effect of the second filter element 20.

Optionally, the first inner end cap 41 is provided with an inner flange extending into the fourth uniform flow channel 22, and the outer peripheral surface of the inner flange contacts with the inner peripheral surface of the second filter element 20. Alternatively, the outer periphery of the first inner end cap 41 is provided with a burring, the inner side face of which is in contact with the outer peripheral face of the second filter member 20. The inner flange and the outer flange are arranged in the same way, so that the liquid blocking effect of the first inner end cover 41 on the end surfaces of the fourth uniformly distributed flow passage 22 and the second filter piece 20 can be enhanced; and a foolproof fit of the first inner end cap 41 and the second filter member 20 can be formed, with easy assembly.

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

Alternatively, as shown in fig. 1, a boss is formed by protruding the middle of the first outer end cover 42, and the first inner end cover 41 is suspended above the boss, so that the third uniform flow passage 21 is communicated with the transition port 332. That is, the water filtered by the second filter member 20 may flow to the spiral wound reverse osmosis membrane element 3 through the aqueduct 332, and be filtered again by the spiral wound reverse osmosis membrane element 3; alternatively, the water filtered by the spiral wound reverse osmosis membrane element 3 may flow to the second filter member 20 through the transition port 332 and be filtered again by the second filter member 20.

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

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

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

Specifically, first insertion tube 421 is coaxially disposed with first inner end cap 41, and the inner diameter of first insertion tube 421 is smaller than the outer diameter of first inner end cap 41, so that first inner end cap 41 and second filter element 20 are blocked in first outer end cap 42.

Alternatively, the gap between the first inner end cap 41 and the first outer end cap 42 is smaller, the first inner end cap 41 contacts with the first outer end cap 42 when the first inner end cap is acted by a force towards the first outer end cap 42, and when the transition port 332 is pushed open by the inflow water, the gap is enlarged, and the water path circulation is more smooth. The design of the first inner end cap 41 as a suspension at a small distance from the first outer end cap 42 allows for a delicate balancing of the water pressure as it passes through the second filter element 20. That is, when the water pressure in the fourth equispaced flow passages 22 is higher than the water pressure at the transition port 332, the first inner end cap 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. Wherein, the second inner end cap 43 is fitted on the axial end face of the second filter member 20 far from the transition port 332 to block the second filter member 20, and the second inner end cap 43 is provided with an inner port 431 communicated with the third inlet and outlet port 201. Here, the second inner end cap 43 closes the top of the second filter element 20 and provides a top connection for the second filter element 20 and a direction for the third inlet/outlet 201, which effectively prevents the liquid to be purified on both sides of the second filter element 20 and the purified liquid from crossing at the top, further ensuring the filtering effect of the second filter element 20. The fluid filtered by the second filter group 500 is collected in the fourth uniform flow channel 22 and discharged to the outside through the inner port 431.

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

The second outer end cap 44 is fitted over the axial end face 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 externally fitted over the inner port 431. Correspondingly, the second outer end cap 44 closes the tops of the first filter element 10 and the second uniform flow passage 12, and provides a connection for the first filter element 10, so as to separate the first inlet/outlet 101 and the second inlet/outlet 102, thereby effectively preventing the liquid to be purified and the liquid after purification on the two sides of the first filter element 10 from being mixed at the top, and further ensuring the filtering effect of the first filter element 10.

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

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

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

As can be seen from this, one end of the first filter member 10 is inserted into the transition opening 332 through the first outer end cap 42, and the other end of the first filter member 10 is inserted into the second connection pipe 312 through the second outer end cap 44, so that the position of the first filter member 10 is substantially fixed, and the assembly process is a two-end insertion process, which makes the assembly very simple and time-saving. And both ends of the first filter member 10 are not removed as long as the housing 300 is not deformed, whereby it can be seen that the first filter member 10 is assembled with high reliability.

One end of the second filter member 20 is inserted into the first connecting pipe 311 through the second inner end cap 43, the other end of the second filter member 20 is sealed by the first inner end cap 41, and the interval between the first inner end cap 41 and the first outer end cap 42 is very small, which is equivalent to that the other end of the second filter member 20 is supported by the first outer end cap 42. In this way, the position of the second filter element 20 is also substantially fixed and the assembly step is carried out with only one end plugged, which makes it possible to assemble it very simply and in a time-saving manner. And both ends of the second filter member 20 are not removed as long as the housing 300 is not deformed, whereby it is seen that the assembling reliability of the second filter member 20 is high.

In the example of fig. 1 and 4, the second inner end cap 43 is formed with a second inner insert tube 432, and the orifice of the second inner insert tube 432 forms the above-described inner port 431. The second inner insertion tube 432 may be inserted into the first connection tube 311, and the second inner insertion tube 432 may also be inserted outside the first connection tube 311. In order to improve the sealing effect, a sealing ring is arranged between the second inner inserting tube 432 and the first connecting tube 311.

In the example shown in fig. 1 and 4, the second outer end cap 44 has a second outer cannula 442 formed thereon, the orifice of the second outer cannula 442 forming the outer port 441 described above. A second outer cannula 442 may be inserted within the second adapter 312 and the second outer cannula 442 may also be inserted outside the second adapter 312. In order to improve the sealing effect, a sealing ring is arranged between the second outer insertion tube 442 and the second connection tube 312.

In some examples, as shown in fig. 1 and 4, a third connection pipe 313 is provided on an inner circumferential wall of the housing 300, and the middle port 451 of the second middle end cap 45 is connected to 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 isolation plate 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 assembled to the inner side of the waterway partition plate 46, the waterway partition plate 46 cannot be installed if the opening is small, and the assembly of the second outer end cap 44 and the first filter element 10 is affected if the opening of the waterway partition plate 46 is large, which increases the difficulty of the whole assembly.

Therefore, the second middle end cover 45 is provided, parts such as the second filter piece 20 and the like are firstly installed in the water channel partition plate 46 during assembly, and then the second middle end cover 45 is connected to the water channel partition plate 46, so that the assembly requirement is met, and the reliability of the overall assembly is improved. On the other hand, when the water path partition plate 46 is integrally formed with the first outer end cap 42, the water path partition plate can be manufactured by an integral injection molding method, and at this time, the second middle end cap 42 should not be integrally injection molded for convenience of mold opening.

The third connecting pipe 313 is arranged on the shell 300, the third connecting pipe 313 is connected with the middle port 451 in an inserting mode, the step of fixing the end portion of the water path partition plate 46 only comprises the inserting process, and the water path partition plate is very simple and time-saving in assembly and high in reliability. In the example of fig. 1, a second middle cannula 452 is formed on the second middle end cap 45, and a nozzle of the second middle cannula 452 forms the middle port 451. The second middle cannula 452 can be inserted inside the third adapter 313, and the second middle cannula 452 can also be inserted outside the third adapter 313. In order to improve the sealing effect, a sealing ring is arranged between the second middle insertion tube 452 and the third connection tube 313, and a sealing ring is also arranged between the second middle end cover 45 and the waterway partition plate 46.

In the example of fig. 1, the small distance between the second center end cap 45 and the second outer end cap 44 allows for a delicate balancing of the water pressure as it passes through the first filter element 10. That is, when the water pressure inside the waterway partition 46 is higher than the water pressure outside, the second middle cap 45 may be pressed against the second outer cap 44, and the filtering speed of the first filter member 10 is slowed down. During normal operation, the water pushes the second middle end cover 45 open and flows normally toward the second inlet/outlet 102.

In some embodiments, all of the components of the first receiving cavity 100 are pre-assembled into a single piece, that is, 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, and the second middle end cap 45 are pre-connected into a front-rear integrated filter cartridge. Even the sealing rings at the first adapter 311, the second adapter 312, and the third adapter 313 may be pre-assembled to the second inner cannula 432, the second outer cannula 442, and the second middle cannula 452.

The front and rear integrated filter element can be directly inserted between the transition plate 331 and the first bottle cap 310 during assembly, and the assembly process of the whole machine is greatly simplified. Moreover, if the first bottle cap 310 is detachably connected to the bottle body 330, the user can replace the front and rear integrated filter element by himself or herself after using the first bottle cap, and the operation steps of the user during 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 tops of the second middle end cap 45, the second inner end cap 43 and the second outer end cap 44 are flush, which facilitates the capping of the top of the first accommodating chamber 100 by the first bottle cap 310.

In some examples of the present invention, as shown in fig. 1 and 4, a fourth connection pipe 321 is disposed on an inner circumferential wall of the housing 300, the fourth connection pipe 321 is disposed on the second bottle cap 320 in fig. 5, the fourth connection pipe 321 communicates with the fifth inlet/outlet 301, a fourth insertion tube 481 is disposed on the fourth end cap 48, and the fourth insertion tube 481 is connected to the fourth connection pipe 321 in an inserting manner. The insertion connection of the fourth insertion tube 481 and the fourth connection 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 coupled to the bottom of the housing 300, preventing the spiral wound type reverse osmosis membrane element 3 from being positionally changed during the filtration process.

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

In some specific examples, all parts in the second receiving chamber 200 are pre-assembled into a single piece, i.e., the spiral wound reverse osmosis membrane element 3, the waste water header 34, the filtration membrane 32, the third end cap 47, and the fourth end cap 48 are pre-connected into an integrated RO membrane cartridge. Even the sealing rings at the transition port 332 and the fourth adapter 321 can be pre-assembled on the third and fourth externally-passed

insertion tubes

471 and 481.

Such an integrated RO membrane filter element can be directly inserted between the transition plate 331 and the second bottle cap 320 during assembly, and the assembly process of the whole machine is greatly simplified. And if second bottle lid 320 is the removable connection on bottle 330, that user's back of using also can change integration RO membrane filter core by oneself, and the operation step when user oneself changes is also very easy moreover, has improved user's the experience of changing the core, has reduced the cost of changing the core.

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

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

To better understand the aspects of an embodiment 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 describe the three-stage filtering function of the composite filter element assembly 1000 by taking purified tap water as an example, and describe a highly integrated design structure of the composite filter element assembly 1000. The first filter member 10 will be described by taking a roll-type primary filter member formed by rolling a nonwoven fabric, a polypropylene layer, carbon fibers, and a spacer 49 as an example; the filter membrane 32 will be described by taking a side-stream reverse osmosis water-saving membrane with high water saving as an example of intermediate filtration. The second filter 20 is explained by taking a cylindrical hollow carbon rod as an example of the 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, where each bottle cap forms a screw thread 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 inlet of tap water, a second inlet and outlet 102 for outlet of pre-positioned water, and a third inlet and outlet 201 for outlet of drinking water. The second bottle cap 320 is provided with a fourth inlet and outlet 302 for reverse osmosis pre-positioned water inlet and a fifth inlet and outlet 301 for reverse osmosis high salinity wastewater drainage.

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

As shown in fig. 1, a transition plate 331 is integrally formed inside the housing 300 and is perpendicular to the wall of the cylinder, and the transition plate 331 axially separates the housing 300 to form a first accommodating chamber 100 and a second accommodating 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 filter units are disposed in the first receiving chamber 100, the first filter element 10 disposed on the outside is used as a primary filter unit, and the second filter element 20 disposed in the center of the first receiving chamber 100 is used as a final filter unit. The axial length of the first filter member 10 is greater than that of the second filter member 20, and the first filter member 10 and the second filter member 20 are separated from each other by providing a cylindrical water passage partition plate 46. An annular first uniform flow channel 11 is defined between the first filtering piece 10 and the inner wall of the first accommodating cavity 100, and the first uniform flow channel 11 is connected with the first inlet/outlet 101. An annular second uniform flow channel 12 is defined between the water path partition plate 46 and the first filtering piece 10, and the second uniform flow channel 12 is connected with the second inlet/outlet 102. An annular third uniform flow channel 21 is defined between the water path partition plate 46 and the second filtering piece 20, and a cylindrical fourth uniform flow channel 22 is arranged on one side of the second filtering piece 20 far away from the third uniform flow channel 21. The third equispaced flow channels 21 are connected to the transition port 332, and the fourth equispaced flow channels 22 are connected to the third inlet and outlet port 201.

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

As shown in fig. 1 and 4, the inner peripheral wall of the housing 300 includes a first connection pipe 311, a second connection pipe 312, and a third connection pipe 313, the second middle end cap 45 is connected to the third connection pipe 313 in an inserting manner, and a channel for connecting the second inlet/outlet 102 is formed between the third connection pipe 313 and the second outer end cap 44.

As shown in fig. 1, the third filter member 30 having a cylindrical shape is disposed in the second receiving chamber 200. The third filter element 30 and the inner wall of the second receiving chamber 200 define a fifth uniform flow channel 31 therebetween, and the central tube 33 of the third filter element 30 is disposed opposite to the transition port 332. The wall of the central tube 33 is provided with a filtered water inlet hole, and the wall of the central tube 33 is provided with a filtering membrane 32. The filtration membranes are reverse osmosis membrane bags 32, the reverse osmosis membrane bags 32 having a first portion and a second portion, each waste water header 34 separated from the central tube 33 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 formed around the central tube 33 and the group of the plurality of waste water headers 34 to form a multi-layered spiral wound membrane module.

As shown in fig. 9 and 11, five waste water headers 34 are provided around the central pipe 33, and 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 reverse osmosis membrane element 3 is provided with a third end cap 47 and a fourth end cap 48 at both ends thereof, respectively, the third end cap 47 is sealed at one end of the third filtering channel 32 and the waste water passing chamber facing the first filtering unit 100, and the fourth end cap 48 is sealed at one end of the third filtering channel 32 and the filtered water passing chamber facing away from the first filtering unit 100. The third end cover 47 has a third outer insertion tube 471 and a third inner insertion tube 472 which are communicated with each other, the third outer insertion tube 471 is inserted into the transition port 332, and the third inner insertion tube 472 is connected to the central tube 33. The third end cap 47 is provided with a positioning projection 473 which is in foolproof fit with the waste pipe 34. The positioning protrusion 473 can 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 from the lower end of the waste water header 34. The fourth end cap 48 is provided with a waste 482 connected to the waste manifold 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 tube 481, and the fourth insertion tube 481 is connected with the fourth connecting pipe 321 in an inserting manner. The fourth end cap 48 is provided with a plug (not shown) that is 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 peripheries of the third end cap 47 and the fourth end cap 48 are provided with fixed-axis protrusions, the fixed-axis protrusions can be matched with the inner wall of the bottle body 330, and the relative sliding between the third end cap 47 and the bottle body 330 and the relative sliding between the fourth end cap 48 and the bottle body 330 are limited, so that the relative sliding between the spiral reverse osmosis membrane element 3 and the bottle body 330 is limited.

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

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

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

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

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

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

Claims

1. A composite filter element assembly, comprising:

the water pressure in the first accommodating cavity is lower than that in the second accommodating cavity;

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

and the second filtering 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 filtering group.

2. The composite filter element assembly of claim 1, wherein the housing defines a first inlet/outlet, a second inlet/outlet, and a third inlet/outlet, the first filter element includes a first filter element, a second filter element, and a water-way partition plate, the water-way partition plate is disposed in the first receiving chamber, the water-way partition plate partitions the first receiving chamber into a first low-pressure region and a second low-pressure region, the first filter element is disposed in the first low-pressure region, water flowing from the first inlet/outlet flows through the first filter element and then flows out from the second inlet/outlet, the second filter element is disposed in the second low-pressure region, and water flowing from the transition port flows out from the third inlet/outlet after passing through the second filter element.

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

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

5. The composite filter element assembly of claim 2, wherein the first low pressure zone has a water pressure of 0.1-0.4 MPa.

6. The composite filter element assembly of claim 2, 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 connected with one end periphery of the water channel partition plate in a sealing mode, a first inserting pipe communicated with the second low-pressure area is arranged on the first outer end cover, the first inserting pipe is connected with the transition plate, and a first sealing element is arranged between the first inserting pipe and the transition plate to prevent the high-pressure cavity and the first low-pressure area from streaming.

7. The composite filter element assembly of claim 6, wherein the first filter group comprises a second middle end cap, the second middle end cap is connected with the other end periphery of the waterway partition plate in a sealing mode, a second middle insertion pipe is arranged on the second middle end cap, and the second middle insertion pipe is connected with the shell in a sealing mode so that the second low-pressure area is prevented from being connected with the first low-pressure area in a series flow mode.

8. The composite filter element assembly of claim 1, wherein the housing defines a fourth inlet/outlet and a fifth inlet/outlet,

the second filter bank includes: a spiral wound reverse osmosis membrane element comprising: the reverse osmosis membrane water purifier 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 collecting tubes arranged at intervals, the waste water collecting tubes are arranged around the central tube, filter water inlet holes are formed in the tube wall of the central tube, and waste water inlet holes are formed in the tube wall of the waste water collecting tubes;

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

and water entering the high-pressure cavity from the fourth inlet/outlet flows to the filtered water inlet hole after being filtered by the reverse osmosis membrane bag, the wastewater header is connected with the fifth inlet/outlet, and the central pipe is connected with the transition port.

9. The composite filter element assembly of claim 8, 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 roll type reverse osmosis membrane element, the third end cover faces the transition plate, the central pipe is connected with the transition hole through the third end cover, and the waste water pipe is connected with the fifth inlet and the fifth outlet through the fourth end cover.

10. The composite filter element assembly of claim 9, wherein the reverse osmosis membrane bag is glued to the third end cap and the fourth end cap at both axial ends of the rolled-out circular tube.