CN111115871A

CN111115871A - Composite filter element and water treatment device with same

Info

Publication number: CN111115871A
Application number: CN201811289499.7A
Authority: CN
Inventors: 李杨敏
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 and a water treatment device with the same, wherein the composite filter element comprises: casing, first filter bank, inner tube and second filter bank, first filter bank establishes in the casing, just it has built-in filter media installation cavity to inject in the first filter bank, inner tube detachably establishes in the built-in filter media installation cavity, the second filter bank establishes in the inner tube. According to the composite filter element provided by the embodiment of the invention, the second filter group is arranged in the inner pipe, and the inner pipe is arranged in the first filter group, namely the first filter group, the inner pipe and the second filter group are sequentially nested, so that the space in the first filter group can be fully utilized, the first filter group and the second filter group are compounded in the shell at intervals by utilizing the inner pipe, the space of the original filter pipe accommodates two filter pipes, and the occupied space of the first filter group and the second filter group is saved. And the inner pipe assembly that can dismantle the setting is simple, provides convenience for first filter bank assembly.

Description

Composite filter element and water treatment device with same

Technical Field

The invention belongs to the technical field of household appliances, and particularly relates to a composite filter element and a water treatment device with the same.

Background

In the related art, a water treatment device such as a water purification dispenser, which includes a plurality of graded filter elements, occupies a large space and has a small flux, occupies a large indoor space, causes great inconvenience to users, and cannot meet the water demand of users.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art.

Therefore, the invention provides the composite filter element which is small in size and saves occupied space.

The invention also provides a water treatment device with the composite filter element.

A composite filter element according to an embodiment of the first aspect of the invention comprises: casing, first filter bank, inner tube and second filter bank, first filter bank establishes in the casing, just it has built-in filter media installation cavity to inject in the first filter bank, inner tube detachably establishes in the built-in filter media installation cavity, the second filter bank establishes in the inner tube.

According to the composite filter element provided by the embodiment of the invention, the second filter group is arranged in the inner pipe, and the inner pipe is arranged in the first filter group, namely the first filter group, the inner pipe and the second filter group are sequentially nested, so that the space in the first filter group can be fully utilized, the first filter group and the second filter group are compounded in the shell at intervals by utilizing the inner pipe, the space of the original filter pipe accommodates two filter pipes, and the occupied space of the first filter group and the second filter group is saved. And the inner pipe assembly that can dismantle the setting is simple, provides convenience for first filter bank assembly.

According to an embodiment of the composite filter element of the present invention, the first filter group is an RO filter element and the second filter group is a PAC filter element, the PAC filter element having a wall thickness greater than 10 mm.

According to the composite filter element provided by the embodiment of the invention, the shell is provided with a tap water inlet, a purified water outlet, a purified water inlet and a purified water outlet; the outer wall of the first filtering group and the inner wall of the shell define a first purified water cavity communicated with the purified water inlet; the inner wall of the first filtering group and the outer wall of the inner pipe define a pure water cavity communicated with the pure water outlet; the inner wall of the inner pipe and the outer wall of the second filtering group define a tap water cavity communicated with the tap water inlet; and a second purified water cavity communicated with the purified water outlet is defined in the second filtering group.

According to one embodiment of the invention, the first filtering group comprises: center tube, RO filter membrane and annular inner cup, built-in filter media installation cavity is established in the center tube, be formed with the pure water through-hole on the wall of center tube, the RO filter membrane cover is established on the center tube, annular inner cup is established on the center tube, the interior week of annular inner cup along with the upper end of inner tube is along linking to each other, just the lower terminal surface of annular inner cup with the up end of RO filter membrane ends to.

According to one embodiment of the invention, a waste water groove which is opened downwards is defined in the annular inner cover, the upper end surface of the RO filter membrane and the annular inner cover are matched to close the waste water groove to form a waste water cavity, and a waste water opening communicated with the waste water cavity is formed in the top of the inner cover.

According to one embodiment of the invention, the top of the housing is provided with a waste water outlet communicating with the waste water inlet.

According to one embodiment of the invention, the second filtration group comprises: PAC skeleton and PAC filter membrane, the PAC skeleton is located the intraductal and follow the axial extension of inner tube, the second water purification chamber is established in the PAC skeleton, the PAC filter membrane cover is established on the PAC skeleton and follow the axial extension of PAC skeleton, the running water chamber is injectd the periphery wall of PAC filter membrane with between the internal perisporium of inner tube.

According to one embodiment of the invention, the PAC framework is tubular, the inner cavity of the PAC framework is communicated with the purified water outlet, and a purified water through hole is formed in the wall of the PAC framework.

According to one embodiment of the invention, the second filtration group further comprises: the PAC filter membrane comprises a PAC annular upper end cover and a PAC lower end cover, wherein the PAC annular upper end cover is sleeved on the upper part of the PAC framework, the lower surface of the PAC annular upper end cover is in sealing butt joint with the upper end surface of the PAC filter membrane, a first water through hole for communicating the tap water cavity with the tap water inlet and a second water through hole for communicating the second water purification cavity with the purified water outlet are limited on the PAC annular upper end cover, the PAC lower end cover is sleeved on the lower part of the PAC framework, and the upper surface of the PAC lower end cover is in sealing butt joint with the lower end surface of the PAC.

According to one embodiment of the invention, the outer periphery of the PAC annular upper end cover is provided with an upper flanging which is turned downwards, the inner wall of the upper flanging abuts against the outer peripheral wall of the PAC filter membrane, the outer periphery of the PAC lower end cover is provided with a lower flanging which is turned upwards, and the inner wall of the lower flanging abuts against the outer peripheral wall of the PAC filter membrane.

According to one embodiment of the invention, the composite filter element further comprises: the active carbon filter element is arranged in the pure water cavity, the active carbon filter element divides the pure water cavity into an original pure water cavity outside the active carbon filter element and a water outlet cavity in the active carbon filter element, and the water outlet cavity is communicated with the pure water outlet.

According to one embodiment of the invention, the activated carbon filter element and the inner tube are arranged in the axial direction of the first filter group.

According to an embodiment of the present invention, further comprising: the water outlet pipe penetrates through the inner pipe along the axial direction of the inner pipe, one end of the water outlet pipe is communicated with the water outlet cavity, and the other end of the water outlet pipe is communicated with the pure water outlet.

According to one embodiment of the invention, the housing comprises: the bottom of the cylinder is opened, the first filtering group is arranged in the cylinder, the tap water inlet, the purified water outlet, the purified water inlet and the purified water outlet are arranged at the top of the cylinder, the lower cover is connected with the cylinder to seal the open opening of the cylinder, and the upper surface of the lower cover is in sealing butt joint with the lower end surface of the first filtering group.

According to an embodiment of the invention, the central axis of the first filter group, the central axis of the second filter group, the central axis of the inner tube coincide with the central axis of the housing.

The water treatment device according to the second aspect of the embodiment of the invention comprises the composite filter element according to the embodiment.

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 a composite filter element according to an embodiment of the invention;

FIG. 2 is a schematic view of a partial configuration of a composite filter element according to an embodiment of the invention;

FIG. 3 is a cross-sectional view taken along line A-A of FIG. 1;

FIG. 4 is a cross-sectional view taken along line B-B of FIG. 2;

FIG. 5 is an exploded view of the mechanism of FIG. 4;

FIG. 6 is an exploded view of a housing of a composite filter element according to an embodiment of the present invention;

FIG. 7 is a schematic illustration of the mating of an inner tube and an activated carbon filter element according to an embodiment of the invention;

FIG. 8 is a cross-sectional view taken along line C-C of FIG. 7;

FIG. 9 is a schematic structural view of an annular inner cap according to an embodiment of the present invention;

FIG. 10 is a cross-sectional view of an annular inner cap according to an embodiment of the present invention;

FIG. 11 is a top view of an annular inner cap according to an embodiment of the present invention;

FIG. 12 is a schematic structural diagram of a center tube according to an embodiment of the present invention;

FIG. 13 is a cross-sectional view of a center tube according to an embodiment of the present invention;

FIG. 14 is a side view of a base pipe according to an embodiment of the present invention;

FIG. 15 is a schematic structural view of a waste plug according to an embodiment of the present invention;

FIG. 16 is a schematic view of a first securing structure and a first plug structure of a composite filter element assembly according to an embodiment of the present invention in a first position;

FIG. 17 is an enlarged partial view of the first fixing structure and the first plugging structure in the first position;

FIG. 18 is a schematic view of the first securing structure and the first plug structure of the composite filter element assembly of one embodiment of the present invention in a second position;

FIG. 19 is an enlarged partial view of the first securing structure and the first plug structure in a second position according to one embodiment of the present invention;

FIG. 20 is a perspective view of a handle with a first mating structure according to one embodiment of the present invention;

FIG. 21 is a schematic view of a second securing structure and a second plug structure of a composite filter element assembly according to an embodiment of the present invention in a first position;

FIG. 22 is a partial schematic view of the second securing structure and the second plug structure of one embodiment of the present invention in a first position;

FIG. 23 is a schematic view of a second securing structure and a second plug structure of a composite filter element assembly according to an embodiment of the present invention in a second position;

FIG. 24 is a schematic view of a second fixing structure and a second plug structure of an embodiment of the present invention in a second position;

FIG. 25 is a top view of a second securing structure and a second plug structure of the composite filter element assembly according to one embodiment of the present invention;

fig. 26 is a perspective view of a handle with a second plug structure according to an embodiment of the present invention.

Reference numerals:

100: a composite filter element;

10: a housing; 11: a barrel; 111: a tap water inlet; 112: a purified water outlet; 113: a purified water inlet; 114: a pure water outlet; 115: a waste water outlet; 12: a lower cover; 13: an adapter; 14: a waste water plug; 141: a plug end; 142: a guide section; 15: a decorative cover; 16: a handle; 161: a mating structure; 1611: a first plug-in structure; 16111: a shaft sleeve; 16112: a guide groove; 16113: a clamping hole; 1612: a second plug-in structure; 16121: inserting a column; 16122: a jack; 16123: a clamping block; 17: a fixed structure; 171: a first fixed structure; 1711: a guide post; 1712: a limiting column; 172: a second fixed structure; 1721: a groove; 1722: necking; 1724: connecting columns;

20: a first filtration group; 21: a central tube; 211: enclosing plates; 2111: a pure water through hole; 2112: a water chute; 212: a lower cover plate; 213: a support table; 22: an RO filter membrane; 23: an annular inner cover; 231: a waste water chamber; 232: a waste water port;

30: an inner tube;

40: a second filtration group; 41: a PAC skeleton; 42: a PAC filter membrane; 43: a PAC annular upper end cap; 44: a PAC lower end cap; 441: a glue blocking ring;

50: an activated carbon filter element; 51: a first purified water chamber; 52: a pure water chamber; 521: a water outlet cavity; 522: an original pure water cavity; 53: a tap water chamber; 54: a second purified water cavity;

60: and (5) discharging a water pipe.

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.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

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.

A composite filter cartridge 100 and a water treatment apparatus having the same according to an embodiment of the present invention will be described with reference to fig. 1 to 15.

As shown in fig. 1 and 3, according to one embodiment of the present invention, a composite filter element 100 includes: housing 10, first filter stack 20, inner tube 30, and second filter stack 40.

Specifically, a filter cavity is defined in the housing 10, the first filter group 20 is disposed in the filter cavity, a built-in filter material installation cavity with one open side is defined in the first filter group 20, the inner tube 30 is detachably disposed in the built-in filter material installation cavity by disposing the built-in filter material installation cavity in the first filter group 20, and the second filter group 40 is disposed in the inner tube 30.

Wherein, the inner tube 30 forms into the open other end confined tubulose of one end, and inner tube 30 will be can be with built-in filter media installation cavity interval one-tenth inner chamber and exocoel, and second filter unit 40 is established at the endocavity, because one side of built-in filter media installation cavity is opened, rivers not only can pass first filter unit 20 and thus the filtration through first filter unit 20, can also get into the inner chamber through the opening of built-in filter media installation cavity to through the filtering action of second filter unit 40.

Therefore, according to the composite filter element 100 of the embodiment of the present invention, the second filter group 40 is disposed in the inner tube 30, and the inner tube 30 is disposed in the first filter group 20, that is, the first filter group 20, the inner tube 30 and the second filter group 40 are sequentially nested, so that the space in the first filter group 20 can be fully utilized, and the first filter group 20 and the second filter group 40 are spaced and combined in the housing 10 by using the inner tube 30, which not only improves the filtering effect of the composite filter element 100, but also saves the occupied space of the first filter group 20 and the second filter group 40 because the space originally accommodating one filter element can accommodate two filter tubes. And the inner pipe 30 which is detachably arranged is simple to assemble, thereby providing convenience for assembling the first filter group 20.

As shown in fig. 2 and 4, according to one embodiment of the present invention, the first filter bank 20 is an RO cartridge and the second filter bank 40 is a PAC cartridge having a wall thickness greater than 10 mm.

The filter effect of PAC filter core is relevant with the wall thickness of PAC filter core, and the wall of PAC filter core is the thicker the better filter effect, when the wall thickness of PAC filter core is greater than 10mm, can satisfy the filtration requirement of user to rivers. The filtering effect of the RO filter element is related to the area of the filter membrane wound. Consequently, inject built-in filter media installation cavity in the RO filter core, establish the PAC filter core in the RO filter core, can reduce the volume of PAC filter core when guaranteeing PAC filter core filter effect, and then can reduce the occupation space of PAC filter core, and can reduce the production material of PAC filter core, and then can save the cost, and establish the RO filter core in the outside of PAC filter core, the diameter of RO filter core is great, under the condition around establishing the same area filter membrane, can reduce the wall thickness of RO filter core, can reduce the occupation space of RO filter core equally.

Therefore, the first filter group 20 and the second filter group 40 in the above combination occupy the minimum space under the condition of meeting the filtering requirement of the composite filter element 100, can improve the utilization efficiency of the inner space of the shell 10 to the maximum extent, is beneficial to reducing the volume of the composite filter element 100, and provides convenience for users.

As shown in fig. 1, according to the composite filter element 100 of an embodiment of the present invention, a tap water inlet 111, a purified water outlet 112, a purified water inlet 113 and a purified water outlet 114 are disposed on the housing 10, wherein the tap water inlet 111 and the purified water outlet 112 are communicated with the built-in filter material installation cavity.

The outer wall of the first filter group 20 and the inner wall of the housing 10 define a first purified water chamber 51 communicating with the purified water inlet 113, the inner wall of the first filter group 20 and the outer wall of the inner pipe 30 define a purified water chamber 52 communicating with the purified water outlet 114, the inner wall of the inner pipe 30 and the outer wall of the second filter group 40 define a tap water chamber 53 communicating with the tap water inlet 111, and the second filter group 40 defines a second purified water chamber 54 communicating with the purified water outlet 112.

Water flows into the tap water cavity 53 through the tap water inlet 111, water in the tap water cavity 53 enters the second purified water cavity 54 through the filtering action of the second filtering group 40 and flows out through the purified water outlet 112, the flowing purified water enters the first purified water cavity 51 through the purified water inlet 113 through the action of the booster pump, water in the first purified water cavity 51 enters the purified water cavity 52 through the filtering action of the first filtering group 20, and water in the purified water cavity 52 flows out through the purified water outlet 114 for a user to drink.

Wherein, the gap between the inner wall of the casing 10 and the outer wall of the first filter group 20 is 1.2mm, the gap between the inner wall of the first filter group 20 and the outer wall of the inner tube 30 is 1.2mm, and the gap between the inner wall of the inner tube 30 and the outer wall of the second filter group 40 is 1.2 mm. Therefore, normal passing of water flow can be guaranteed, the volumes of the first filtering group 20 and the shell 10 can be reduced, and the space utilization efficiency is improved.

Moreover, the inner wall of the housing 10, the inner wall of the first filter group 20, the outer wall of the first filter group 20, the inner wall of the inner pipe 30, the outer wall of the inner pipe 30 and the outer wall of the second filter group 40 are matched to define the first purified water cavity 51, the second purified water cavity 54, the tap water cavity 53 and the purified water cavity 52, so that the structure is simple, the realization is easy, the structural design of the composite filter element 100 is facilitated, and the production cost of the composite filter element 100 can be reduced.

As shown in fig. 4, in the present embodiment, the first filter group 20 includes: the filter comprises a central tube 21, an RO filter membrane 22 and an annular inner cover 23, wherein the central tube 21 extends along the axial direction of the shell 10, the upper end of the central tube 21 is opened to define a built-in filter material installation cavity, the inner tube 30 is arranged in the central tube 21, a pure water cavity 52 is defined between the inner wall of the central tube 21 and the outer wall of the inner tube 30, the RO filter membrane 22 is a reverse osmosis filter membrane, and the RO filter membrane 22 is sleeved on the central tube 21 and extends along the axial direction of the. The annular inner cover 23 is sleeved on the central tube 21, the inner peripheral edge of the annular inner cover 23 is in sealing butt joint with the upper edge of the inner tube 30, and the lower surface of the annular inner cover 23 is in sealing fit with the upper end face of the RO filter membrane 22.

Further, as shown in fig. 9 to 11, a waste water opening 232 is formed in the annular inner cover 23, a waste water groove with an open lower surface is defined in the annular inner cover 23, the waste water groove extends along the circumferential direction of the annular inner cover 23, the upper end surface of the RO filter membrane 22 and the annular inner cover 23 cooperate to close the waste water groove to form a waste water chamber 231, and a waste water passage communicating the waste water chamber 231 with the waste water outlet 115 is defined in the annular inner cover 23.

The RO filter core separates out waste water at the filtering process, can guide waste water discharge through setting up waste water mouth 232, waste water chamber 231 and waste water channel. The waste water chamber 231 is defined on the annular inner cover 23, so that the waste water can be prevented from being mixed into the first purified water chamber 51, the pure water chamber 52, the tap water chamber 53 and the second purified water chamber 54, and the quality of the filtered water flow can be improved. And the waste water of RO filter core is discharged from the tip of RO filter core, inject waste water chamber 231 on annular inner cup 23, can provide convenience for waste water gets into waste water chamber 231, and simple structure has eliminated the water conservancy diversion passageway between RO filter core and the waste water chamber 231 moreover, has simplified composite filter 100's structural design and water route design.

Wherein, the top of casing 10 is equipped with the waste water outlet 115 of intercommunication waste water mouth 232, and waste water in the waste water chamber 231 passes through waste water outlet 115 and discharges, is equipped with the waste water valve on the waste water outlet 115, waste water valve and casing 10 integrated into one piece, and when waste water in the waste water chamber 231 reaches certain pressure, the waste water valve is opened, and waste water discharges.

As shown in fig. 7 and 8, in the present embodiment, the second filtration group 40 is a PAC cartridge, the second filtration group 40 comprising: PAC skeleton 41 and PAC filter membrane 42, PAC skeleton 41 is located inner tube 30 and extends along the axial of inner tube 30, and PAC filter membrane 42 cover is established on PAC skeleton 41 and extends along the axial of PAC skeleton 41, and PAC filter membrane 42 is the tubulose filter piece that polymerized aluminium chloride material made, and PAC filter membrane 42's thickness is greater than 10 mm.

Wherein, PAC skeleton 41 is internal to define second clear water chamber 54, and PAC filter membrane 42 outer wall and the inner wall of inner tube 30 define the running water chamber 53, and the running water passes through running water inlet 111 and gets into running water chamber 53, and the rivers are crossed PAC filter membrane 42 and are flowed out from the inner wall of PAC skeleton 41 and get into second clear water chamber 54 through the filtration of PAC filter membrane 42, then flow out from clear water outlet 112.

Because the filtering effect of the PAC filter membrane 42 is related to the thickness of the water flow passing through the PAC filter membrane 42, the PAC filter membrane 42 and the PAC framework 41 form the second filtering group 40 and are arranged in the inner pipe 30, the diameter of the second filtering group 40 is reduced, the occupied space of the second filtering group 40 can be further reduced, the volume and production materials of the PAC filter membrane 42 can be reduced, and the cost is reduced.

Further, PAC skeleton 41 is tubular, and a plurality of holes penetrating through a wall of PAC skeleton 41 in a thickness direction of the wall of PAC skeleton 41 are formed on the wall of PAC skeleton 41. By providing holes in the walls of PAC skeleton 41, the flow of water within PAC filter 42 may be facilitated through the holes into second clean water chamber 54.

As shown in fig. 3 and 8, in the present embodiment, the second filter group 40 further includes: PAC annular upper end cover 43 and PAC lower end cover 44, PAC annular upper end cover 43 cover is established at PAC skeleton 41's upper end, and PAC annular upper end cover 43's lower surface seals the up end face that butts PAC filter membrane 42, and PAC lower end cover 44 cover is established at PAC skeleton 41's lower extreme, and PAC lower end cover 44's upper surface seals the lower extreme face that butts PAC filter membrane 42.

Through setting up PAC annular upper end cover 43 and PAC lower extreme lid 44, can promote PAC filter membrane 42 upper end and the leakproofness of lower extreme, prevent that the rivers in the PAC filter membrane 42 from flowing out from PAC filter membrane 42's upper end or lower extreme, not only can prevent that rivers from getting into out the water cavity 521, can promote the leakproofness of running water cavity 53 moreover.

As shown in fig. 8, in this embodiment, the outer periphery of the PAC annular top end 43 is formed with an upturned edge folded downward, the inner wall of the upturned edge abuts against the outer peripheral wall of the PAC filter 42, the outer wall of the upturned edge and the inner wall of the inner tube 30 define a tap water passage, and water flows from the tap water inlet 111 into the tap water chamber 53 through the tap water passage.

Be equipped with on PAC lower end cap 44's the periphery along keeping off gluey ring 441, keep off gluey ring 441 and include: the PAC filter membrane 42 comprises a connecting ring and a sealing ring, wherein the connecting ring extends along the circumferential direction of the PAC lower end cover 44 and is connected with the outer circumferential edge of the PAC lower end cover 44, the sealing ring is arranged around the PAC lower end cover 44 and extends along the axial direction of the PAC lower end cover 44, the lower circumferential edge of the sealing ring is connected with the outer circumferential edge of the connecting ring, and the inner circumferential wall of the sealing ring is in sealing butt joint with the outer circumferential.

Therefore, the performance of the second filter group 40 can be improved, the tightness and reliability of the tap water cavity 53 can be improved, and water leakage can be prevented.

According to an embodiment of the present invention, further comprising: the activated carbon filter element 50 and the activated carbon filter element 50 are arranged in the pure water cavity 52, the pure water cavity 52 is divided into an original pure water cavity 522 outside the activated carbon filter element 50 and a water outlet cavity 521 inside the activated carbon filter element 50 by the activated carbon filter element 50, and the water outlet cavity 521 is communicated with the pure water outlet 114.

That is, the pure water filtered by the first filtering set 20 enters the original pure water chamber 522, the water in the original pure water chamber 522 passes through the activated carbon filter element 50, and enters the water outlet chamber 521 through the filtering action of the activated carbon filter element 50, so that the impurities or the peculiar smell in the water can be further removed. Wherein, first filtration group 20 is the RO filter core, and the water after the RO filter core filters becomes the faintly acid, and the taste is relatively poor, is unsuitable for the user to directly drink, through the filtering action of the heart of living carbon filter core, can further promote the quality of pure water, has promoted the taste of drinking water.

Moreover, the activated carbon filter element 50 is arranged in the pure water cavity 52, so that the compounding degree of the composite filter element 100 can be further improved, the filtering effect of the composite filter element 100 on water flow is improved, and compared with the independent arrangement of the activated carbon filter element 50, the water flow design of the composite filter element 100 can be simplified, and the volume of the composite filter element 100 can be reduced.

As shown in fig. 8, according to an embodiment of the present invention, the activated carbon filter element 50 and the inner tube 30 are arranged along the axial direction of the first filter group 20, that is, the first filter group 20 defines an inner filter installation cavity extending along the axial direction of the first filter group 20, the sum of the axial length of the inner tube 30 and the axial length of the activated carbon filter element 50 is less than or equal to the axial length of the inner filter installation cavity, the activated carbon filter element 50 is disposed at the bottom of the inner filter installation cavity, and the inner tube 30 is disposed at the top of the activated carbon filter element 50.

Along the active carbon filter element 50 and the inner tube 30 of first filter group 20's axial arrangement, can make full use of the space of built-in filter media installation cavity, be favorable to dwindling the internal diameter of built-in filter media installation cavity, and then can dwindle the diameter and the volume of first filter group 20, the active carbon filter element 50 and the inner tube 30 simple structure of above-mentioned structure moreover, convenient assembling.

As shown in fig. 3 and 8, according to an embodiment of the present invention, the composite filter element 100 further includes a water outlet pipe 60, the water outlet pipe 60 penetrates through the inner pipe 30 along an axial direction of the inner pipe 30, the water outlet pipe 60 is inserted into the PAC skeleton 41, one end (lower end shown in fig. 8) of the water outlet pipe 60 is communicated with the water outlet chamber 521, the other end (upper end shown in fig. 8) of the water outlet pipe 60 is communicated with the pure water outlet 114, and a second pure water chamber 54 is defined between an inner wall of the PAC skeleton 41 and an outer wall of the water outlet pipe 60.

In this embodiment, the pure water outlet 114 is located above the inner tube 30, the water outlet chamber 521 is located in the activated carbon filter element 50 and below the inner tube 30, and the water outlet pipe 60 is disposed to facilitate the water in the water outlet chamber 521 to flow out from the pure water outlet 114, and the water outlet pipe 60 has a simple structure and is easy to implement.

In the present embodiment, the center pipe 21 includes: the filter membrane comprises a surrounding plate 211 and a lower cover plate 212, wherein the surrounding plate 211 is in a cylinder shape with two open ends, the RO filter membrane 22 is sleeved on the surrounding plate 211, the lower cover plate 212 is arranged in the surrounding plate 211 and is positioned at the lower part of the surrounding plate 211, the lower cover plate 212 closes the opening at the lower end of the surrounding plate 211 and is matched with the surrounding plate 211 to define a built-in filter material installation cavity, and the lower end of the activated carbon filter element 50 is abutted against the upper surface of. That is, the center tube 21 is formed in a cylindrical shape having an open upper end and a closed lower end, and the inner wall of the shroud 211, the upper surface of the lower end cap, and the outer surface of the inner tube 30 cooperate to define the pure water chamber 52.

The wall of the center tube 21 is formed with deionized water passing holes 2111, the deionized water passing holes 2111 penetrate the wall of the center tube 21 in the thickness direction of the wall of the center tube 21, the water flows into the RO filter membrane 22 from the lower end of the RO filter membrane 22, the RO filter membrane 22 filters the water flow to separate the water into waste water and deionized water, and the waste water flows out from the upper end of the RO filter membrane 22 and is discharged through the waste water chamber 231 and the waste water outlet 115. The pure water flows out from the inner wall of the RO filter membrane 22 and enters the pure water chamber 52 through the pure water passing hole 2111, and is discharged through the pure water outlet 114 for the user to drink.

As shown in fig. 12, a water guide groove 2112 communicating with the deionized water passage 2111 is formed in the outer peripheral wall of the shroud 211, the water guide groove 2112 is recessed inward with respect to the outer peripheral wall of the shroud 211, and the water filtered by the RO filter membrane 22 flows into the deionized water passage 2111 through the water guide groove 2112, is collected in the filter medium installation chamber, and is then discharged.

Because RO filter membrane 22 is around establishing on bounding wall 211, through set up guiding gutter 2112 on bounding wall 211, can increase the flow efficiency of leading out rivers in the RO filter membrane 22, increase RO filter membrane 22's play water efficiency, and then can promote RO filter element group spare's water purification efficiency.

As shown in fig. 12, the water chute 2112 extends along the circumferential direction of the enclosing plate 211, that is, the water chute 2112 is formed into an annular shape extending along the circumferential direction of the enclosing plate 211, and the pure water through holes 2111 are provided in the water chute 2112, so that the length of the water chute 2112 can be further increased, the water outlet efficiency of the RO filter membrane 22 is further improved, the uniform water outlet efficiency of the RO filter membrane 22 in the circumferential direction can be ensured, and the influence of the partial water outlet on the water purification efficiency of the RO filter membrane 22 due to the obstruction of the water outlet can be prevented.

The lower end of the central tube 21 with the structure is closed, so that the leakage of pure water flow from the lower end of the pure water cavity 52 can be prevented, and the tightness of the upper end of the central tube 21 only needs to be noticed in the RO filter element assembling process.

As shown in fig. 13 and 14, in the present embodiment, the inner wall of the shroud 211 is formed with a support base 213 projecting inward in the radial direction of the shroud 211, the support base 213 has an upper surface, the lower end of the inner tube 30 abuts against the upper surface of the support base 213, and the activated carbon filter element 50 is provided below the inner tube 30, inside the support base 213.

Through set up on bounding wall 211 with inner tube 30 complex brace table 213, can provide convenience for the assembly of inner tube 30, brace table 213 can promote the assembly stability of inner tube 30 to the supporting role of inner tube 30, can reduce the squeezing action of inner tube 30 to activated carbon filter element 50 in addition, prevents that inner tube 30 pressure from too big causing the damage to activated carbon filter element 50, is favorable to prolonging activated carbon filter element 50's life.

Further, the support base 213 extends in the circumferential direction of the shroud 211, that is, the support base 213 is formed in a ring shape extending in the circumferential direction of the shroud 211, the support base 213 may also extend in the axial direction of the shroud 211 to be formed in a tubular shape, the lower end of the support base 213 abuts against the upper surface of the lower end cap of the center tube 21, and the activated carbon filter element 50 is disposed in the support base 213.

The tubular support table 213 can improve the force uniformity of the inner tube 30, and prevent the inner tube 30 from being damaged or inclined due to uneven local force. Wherein, the support table 213, bounding wall 211 and lower extreme cover integrated into one piece, that is to say, center tube 21 is integrated into one piece, integrated into one piece's center tube 21 can promote support table 213, the stability of being connected and joint strength between bounding wall 211 and the lower extreme cover, and then can promote center tube 21's functional stability and reliability, and can eliminate support table 213, the coupling mechanism between bounding wall 211 and the lower extreme cover, the assembly efficiency of center tube 21 and composite filter element 100 has been promoted, and integrated into one piece's center tube 21's intensity is big, long service life.

As shown in fig. 6, according to one embodiment of the present invention, the housing 10 includes: the bottom of the cylinder body 11 is opened, the first filtering group 20 is arranged in the cylinder body 11, the tap water inlet 111, the purified water outlet 112, the purified water inlet 113 and the purified water outlet 114 are all arranged at the top of the cylinder body 11, the lower cover 12 is connected with the cylinder body 11 to seal the opening of the cylinder body 11, and the upper surface of the lower cover 12 is in sealing butt joint with the lower end surface of the first filtering group 20.

Wherein, still be equipped with four adapter 13 on the casing 10, four adapter 13 pegging graft in running water entry 111, water purification export 112, water purification entry 113 and pure water export 114 one-to-one, provide convenience for composite filter 100 assembles the water route through setting up adapter 13, promoted the leakproofness in water route moreover.

The waste water outlet 115 is provided with a waste water plug 14, the waste water plug 114 is inserted into the waste water outlet 115, the waste water plug 14 generates certain resistance to water in the waste water cavity 231, when the water pressure in the waste water cavity 231 reaches a preset pressure value, the waste water plug 14 is conducted, and waste water is discharged from the waste water cavity 231.

In the present embodiment, the waste plug 14 includes: a sleeve inserted in the waste water outlet 115 and connected to the housing, and a plurality of capillaries formed on an inner wall of the sleeve and extending radially inward of the sleeve.

The number of the capillaries is large, the capillaries are arranged along the circumferential direction of the sleeve to form a capillary group, and the capillary group is filled in the sleeve along the axial direction of the sleeve. The waste water stopper of above-mentioned structure, simple structure, easy preparation can effectively promote the water purification effect of RO filter core moreover.

As shown in fig. 15, in the present embodiment, the grommet includes: the waste water treatment device comprises an insertion section 141 and a guide section 142, wherein one end of the insertion section 141 is inserted into the waste water outlet 115, the insertion section 141 extends along the axial direction of the waste water outlet 115, and the guide section 142 is communicated with the other end of the insertion section 141. Capillaries are arranged in the insertion section 141 and the guide section 142, or the capillaries can be arranged only in the insertion section 141 or the guide section 142.

The sleeve pipe of above-mentioned structure not only can increase the water pressure in waste water chamber 231, and grafting section 141 pegs graft in waste water outlet 115 moreover, and stability and leakproofness are better, and direction section 142 is suitable for intercommunication waste water outlet 1115 and waste water drainage pipe, and wherein, direction section 142 perpendicular to grafting section 141 makes things convenient for waste water drainage pipe to connect direction section 142, can provide convenience for waste water discharges.

Wherein, still be equipped with decorative cover 15 on the casing 10, decorative cover 15 covers the top of establishing at barrel 11, and running water inlet 111, water purification export 112, water purification entry 113, pure water export 114 and waste water export 115 all cover and establish in decorative cover 15, have promoted the outward appearance regularity of composite filter element 100 from this.

As shown in fig. 1, in this embodiment, the top of the barrel 11 is further provided with a handle 16, the side wall of the barrel 11 is provided with a first connection point and a second connection point which are arranged at intervals, one end of the handle 16 is connected with the first connection point, the other end of the handle is connected with the second connection point, when the composite filter element 100 is dismounted or assembled, a user can pick and place the composite filter element 100 by lifting the handle 16, the operation is convenient, the stability is strong, and the handle 16 is simple in structure and easy to implement.

Specifically, the housing 10 is provided with a fixing structure 17, the handle 16 is provided with an engaging structure 161, and the engaging structure 161 can be rotatably engaged with the fixing structure 17. Through the mutual cooperation of the matching structure 161 and the fixing structure 17, the handle 16 can be rotatably connected to the housing 10, so that the handle 16 can be directly lifted without holding the housing 10 when the composite filter element assembly 100 is conveniently taken and placed.

The engaging structure 161 has a first position and a second position relative to the fixing structure 17 in the rotation direction, the engaging structure 161 can be inserted into the fixing structure 17 in the first position, and the engaging structure 161 is engaged with the fixing structure 17 in the second position to form an anti-disengaging structure.

The engaging structure 161 of the handle 16 can rotate in the fixing structure 17 and can be changed between a first position and a second position, in the first position, the engaging structure 161 and the fixing structure 17 are conveniently connected, and only the engaging structure 161 needs to be connected in the fixing structure 17 in a pulling and inserting manner, so that the handle 16 is easily installed on the casing 10.

The matching structure 161 and the fixing structure 17 are mutually clamped at the second position, so that the matching structure 161 and the fixing structure 17 are firmly connected and can be prevented from falling off, the lifting is facilitated, and the handle 16 and the shell 10 are prevented from being separated in the lifting process of the handle 16.

Compared with the filter element assembly 100 without the handle or the filter element assembly 100 only fixedly connected with the handle 16 in the prior art, the composite filter element assembly 100 with the handle 16 structure has the advantages of convenience in installation and force bearing performance in the use process after installation.

With the handle 16 having the above connection engagement structure, in the first position, as shown in fig. 16 and 17, when the sleeve 16111 is aligned with the guide post 1711, the stop post 1712 is aligned with the guide slot 16112. The guide post 1711 is inserted into the boss 16111, while the restraint post 1712 is inserted into the guide slot 16112. That is, in the first position, the guiding post 1711 and the limiting post 1712 are inserted into the shaft sleeve 16111 and the guiding slot 16112 without being blocked, and the guiding post 1711 and the limiting post 1712 can be pulled out from the shaft sleeve 16111 and the guiding slot 16112 without being blocked, so that the handle 16 can be mounted on the housing 10.

In the second position, as shown in fig. 18 and 19, the restraint posts 1712 snap into the snap holes 16113. That is, when the position-limiting post 1712 is rotated from the first position to the second position, the position-limiting post 1712 is inserted into the locking hole 16113 through the guide slot 16112, and the locking hole 16113 prevents the position-limiting post 1712 from moving in the axial direction.

For convenience of description, hereinafter, the fixing structure 17 engaged with the first insertion structure 1611 is referred to as a first fixing structure 171, and the fixing structure 17 engaged with the second insertion structure 1612 is referred to as a second fixing structure 172.

Furthermore, features defined as "first," "second," and "third" may explicitly or implicitly include one or more of the features for distinguishing between descriptive features, non-sequential, and non-trivial.

Optionally, the guide slot 16112 extends in the axial direction of the sleeve 16111. At this time, when the shaft sleeve 16111 is inserted into the guide post 1711, the shaft sleeve 16111 is moved in the axial direction to move the engaging hole 16113 to the engaging post 1712, and then the handle 16 is rotated to engage the engaging post 1712 in the engaging hole 16113.

In other embodiments, the guide slot 16112 extends helically in a direction from the end to the card aperture 16113, i.e., the guide slot 16112 is a helically extending slot. When the shaft sleeve 16111 is inserted into the guide post 1711, the shaft sleeve 16111 is rotated while the shaft sleeve 16111 is moved in the axial direction (similar to a screwing operation), so that the engaging hole 16113 is moved to the engaging post 1712, and then the handle 16 is rotated, so that the engaging post 1712 is engaged in the engaging hole 16113.

Alternatively, the guide groove 16112 and the card hole 16113 both penetrate the boss 16111 in the thickness direction of the boss 16111. It is also convenient to machine the guide slot 16112 and the locking hole 16113 in the sleeve 16111. Of course, the present invention is not limited to this, and the guide groove 16112 and the card hole 16113 may be provided on the inner wall of the boss 16111, for example, to achieve the above-described function.

In other embodiments of the present invention, as shown in fig. 21-26, the mating structure 161 is a second plug structure 1612, the second plug structure 1612 includes a plug 16121, a clip 16123 is disposed at an end of the plug 16121, and as shown in fig. 26, the clip 16123 is disposed such that the end of the plug 16121 has a non-circular shape.

In contrast, the fixing structure 17 defines therein a groove 1721, the end of the groove 1721 has a reduced diameter 1722, and the reduced diameter 1722 is formed in a non-circular shape to fit the end of the post 16121. The term "reducer 1722" as used herein is defined as a non-circular shape that fits within the end of the post 16121, meaning that the end of the post 16121 conforms to the shape of the reducer 1722 when the handle 16 is in the first position, although the reducer 1722 is slightly larger than the end of the post 16121. The inner shape of the groove 1721 is not limited as long as the post 16121 can rotate to the second position after the post 16121 is inserted into the groove 1721, i.e., the inner part of the groove 1721 cannot interfere with the latch 16123 at the second position.

In the first position, the plug column 16121 can be inserted into the groove 1721 through the necking 1722, and in the second position, the fixture block 16123 is clamped on the inner side of the necking 1722.

Alternatively, as shown in fig. 22, 24, and 25, a coaxially disposed insertion hole 16122 is formed on the insertion column 16121, a connection column 1724 is formed in the groove 1721, and the connection column 1724 is inserted into the insertion hole 16122. The connecting post 1724 is engaged with the insertion hole 16122, so that the handle 16 is mounted on the housing 10 to guide the handle in the first position, and a rotation shaft is provided for rotating the handle 16 from the first position to the second position. In addition, when the handle 16 is rotated to the second position, the connecting column 1724 can be used as a bearing rod to play a certain supporting role.

Alternatively, as shown in fig. 22, 24 and 26, the outer contour of the end of the plug 16121 is half semicircular and half elliptic, and the constricted portion 1722 of the groove 1721 is half semicircular and half elliptic. Due to the arrangement, on one hand, the handle 16 is matched with the handle, and the handle is easy to identify and assemble; on the other hand, the half-oval shape of the post 16121 has a portion with the clip 16123, so that the profile is smooth and not easy to be stuck, and a stable supporting function is further facilitated, so that the handle 16 is not easy to be released from the outside of the housing 10.

In the assembly process of the composite filter element 100, the RO filter membrane 22 is firstly wound on the central tube 21, then the activated carbon filter element 50 is arranged in the built-in filter material installation cavity, then the inner tube 30 is assembled in the built-in filter material installation cavity, the lower end of the inner tube 30 is abutted against the activated carbon filter element 50, then the water outlet tube 60 is inserted in the inner tube 30, then the second filter group 40 is sleeved on the water outlet tube 60, finally the annular inner cover 23 is covered on the central tube 21, and the water outlet tube 60 and the PAC annular upper end cover 43 extend out from the middle part of the annular inner cover 23. Then the first filtering set 20 is inserted into the cylinder 11, a first water channel, a second water channel, a third water channel, a fourth water channel and a fifth water channel are arranged on the top wall of the inner cavity of the cylinder 11, the first water channel is communicated with a pure water outlet 114 and a water outlet pipe 60, one end of the second water channel is communicated with a tap water inlet 111, and the other end of the second water channel is communicated with a channel between the outer peripheral wall of the PAC annular upper end cover 43 and the inner peripheral wall of the annular inner cover 23; one end of the third water channel is communicated with the purified water outlet 112, the other end of the third water channel is communicated with a channel between the inner peripheral wall of the PAC annular upper end cover 43 and the outer peripheral wall of the water outlet pipe 60, one end of the fourth water channel is communicated with the purified water inlet 113, the other end of the fourth water channel is communicated with a channel between the outer peripheral wall of the RO filter membrane 22 and the inner peripheral wall of the cylinder body 11, and the fifth water channel is communicated with the wastewater outlet 115 and.

In the present embodiment, the central axis of the first filter group 20, the central axis of the second filter group 40, the central axis of the inner tube 30, and the central axis of the water outlet tube 60 coincide with the central axis of the housing 10. That is to say, the water outlet pipe 60, the second filter group 40, the inner pipe 30, the first filter group 20 and the housing 10 are sequentially nested, so that the occupied space of the water outlet pipe 60, the second filter group 40, the inner pipe 30 and the first filter group 20 can be reduced, the utilization efficiency of the internal space of the composite filter element 100 is improved, the size of the housing 10 can be reduced, and convenience is provided for the use and assembly of the composite filter element 100.

The water treatment device according to the second aspect of the embodiment of the present invention includes the composite filter element 100, the booster pump and the tank described in the above embodiments.

Specifically, the box body is provided with a water supply device, a water outlet and a water outlet, the composite filter element 100 and the booster pump are arranged in the box body, the water supply device is communicated with a tap water inlet 111 to supply water for the water treatment device, the booster pump is communicated between a purified water outlet 112 and a purified water inlet 113 and is used for pumping the water flowing out of the second purified water cavity 54 into the first purified water cavity 51 after being pressurized, the water outlet is communicated with a purified water outlet 114 to supply water for a user, and the water outlet is communicated with a wastewater outlet 115 to discharge.

According to the water treatment device of the second aspect of the present invention, including the composite filter element 100 described in the above embodiment, by using the composite filter element 100 in the above embodiment, the volume of the water treatment device can be reduced, the occupied space can be saved, the effluent quality can be improved, and convenience is provided for users.

Other constructions and operations of water treatment devices according to 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 herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like 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, comprising:

a housing;

the first filter group is arranged in the shell, and a built-in filter material installation cavity is defined in the first filter group;

the inner pipe is detachably arranged in the built-in filter material mounting cavity;

a second filter bank disposed within the inner tube.

2. The composite filter element of claim 1, wherein the first filtration group is a RO filter element and the second filtration group is a PAC filter element, the PAC filter element having a wall thickness greater than 10 mm.

3. The composite filter element of claim 1, wherein the housing is provided with a tap water inlet, a purified water outlet, a purified water inlet and a purified water outlet;

the outer wall of the first filtering group and the inner wall of the shell define a first purified water cavity communicated with the purified water inlet;

the inner wall of the first filtering group and the outer wall of the inner pipe define a pure water cavity communicated with the pure water outlet;

the inner wall of the inner pipe and the outer wall of the second filtering group define a tap water cavity communicated with the tap water inlet;

and a second purified water cavity communicated with the purified water outlet is defined in the second filtering group.

4. The composite filter element of claim 3, wherein the first filtration bank comprises:

the built-in filter material installation cavity is arranged in the central tube, and a pure water through hole is formed in the wall of the central tube;

the RO filter membrane is sleeved on the central tube;

the annular inner cup, annular inner cup cover is established on the center tube, the interior week edge of annular inner cup with the upper end edge of inner tube links to each other, just the lower terminal surface of annular inner cup with the up end of RO filter membrane ends.

5. The composite filter element according to claim 4, wherein a waste water groove which is opened downwards is defined in the annular inner cover, the upper end surface of the RO filter membrane is matched with the annular inner cover to seal the waste water groove to form a waste water cavity, and a waste water opening which is communicated with the waste water cavity is formed in the top of the inner cover.

6. The composite filter element of claim 5, wherein the top of the housing is provided with a waste water outlet communicating with the waste water inlet.

7. The composite filter cartridge of claim 3, wherein the second filtration bank comprises:

the PAC framework is positioned in the inner pipe and extends along the axial direction of the inner pipe, and the second water purifying cavity is arranged in the PAC framework;

the PAC filter membrane, the PAC filter membrane cover is established on the PAC skeleton and along the axial extension of PAC skeleton, the running water chamber is injectd between the periphery wall of PAC filter membrane and the internal perisporium of inner tube.

8. The composite filter element of claim 7, wherein the PAC framework is tubular, an inner cavity of the PAC framework is communicated with the purified water outlet, and a purified water through hole is formed in the wall of the PAC framework.

9. The composite filter cartridge of claim 7, wherein the second filtration bank further comprises:

the PAC annular upper end cover is sleeved on the upper part of the PAC framework, the lower surface of the PAC annular upper end cover is in sealing butt joint with the upper end surface of the PAC filter membrane, and a first water through hole for communicating the tap water cavity with the tap water inlet and a second water through hole for communicating the second water purifying cavity with the purified water outlet are limited on the PAC annular upper end cover;

the PAC lower end cover is sleeved at the lower part of the PAC framework, and the upper surface of the PAC lower end cover is in sealing and abutting joint with the lower end surface of the PAC filter membrane.

10. The composite filter element of claim 9, wherein the outer periphery of the PAC annular top end cap is formed with an upturned rim turned downward, an inner wall of the upturned rim abutting against the outer peripheral wall of the PAC filter membrane;

the periphery of the PAC lower end cover is provided with a lower flanging which is turned upwards, and the inner wall of the lower flanging is stopped against the peripheral wall of the PAC filter membrane.

11. The composite filter element of claim 3, further comprising:

the active carbon filter element is arranged in the pure water cavity, the active carbon filter element divides the pure water cavity into an original pure water cavity outside the active carbon filter element and a water outlet cavity in the active carbon filter element, and the water outlet cavity is communicated with the pure water outlet.

12. The composite filter element of claim 11, wherein the activated carbon filter element and the inner tube are arranged along an axial direction of the first filter bank.

13. The composite filter element of claim 12, further comprising:

the water outlet pipe penetrates through the inner pipe along the axial direction of the inner pipe, one end of the water outlet pipe is communicated with the water outlet cavity, and the other end of the water outlet pipe is communicated with the pure water outlet.

14. The composite filter cartridge of claim 3, wherein the housing comprises:

the bottom of the cylinder is open, the first filter group is arranged in the cylinder, and the tap water inlet, the purified water outlet, the purified water inlet and the purified water outlet are all arranged at the top of the cylinder;

the lower cover is connected with the cylinder body to close the open opening of the cylinder body, and the upper surface of the lower cover is in sealing butt joint with the lower end face of the first filtering group.

15. The composite filter element of claim 1, wherein the central axis of the first filter bank, the central axis of the second filter bank, and the central axis of the inner tube coincide with the central axis of the housing.

16. A water treatment device comprising a composite filter element according to any one of claims 1 to 15.