CN218290514U - Composite filter element and water treatment device - Google Patents

Abstract

The utility model relates to a pair of composite filter element, include: a housing having a hollow interior; the front-mounted filter module is arranged in the shell and is cylindrical; a fine filter module disposed inside the housing and along a flow path of the fluid, the fine filter module being located downstream of the pre-filter module; the method is characterized in that: the fine filtering module is positioned inside the front filtering module. Still relate to an application and have aforementioned composite filter element's water treatment facilities.

Description

Composite filter element and water treatment device

Technical Field

The utility model relates to a water treatment facilities, concretely relates to is a composite filter element, still relates to an application have this composite filter element's water treatment facilities.

Background

In water purification units, the filter element serves as a core element for filtering water. In order to improve the water purification effect, the existing water purification equipment generally adopts a multi-stage filter element to treat water, and sequentially comprises a front filter element, a fine filter element and a rear filter element along the flow path of a fluid, wherein the front filter element can be PP cotton sprayed and melted, folded paper PP cotton and the like, mainly plays a role in interception, and removes large suspended matters, silt, iron rust and other pollutants in a water body; a sintered carbon rod, activated carbon and the like can be additionally arranged at the downstream of the water body, and the water body is mainly used for adsorbing and removing residual chlorine, micromolecular organic matters and the like in the water body; the fine filtration filter core can be a roll type reverse osmosis filter core or a roll type nanofiltration filter core, the fine filtration filter core is used for fine filtration and can remove heavy metal ions, micromolecular organic matters and the like in water, the post-positioned filter core can be a microfiltration membrane, an ultrafiltration membrane and the like, the post-positioned filter core is used for preventing microorganisms in effluent from exceeding standards and ensuring the sanitation and safety of water.

Because the water outlets and the water inlets between different filter element assemblies are connected by external pipelines, the internal pipelines of the water purifying equipment are numerous and complicated, and the water purifying equipment has large volume, so that the water purifying equipment is inconvenient to install and use; moreover, the filter element needs to be replaced regularly, but the service lives of different filter elements are different, so that the filter element is inconvenient to replace.

In order to solve the problems, the composite filter element integrated in a cylindrical shell by a multistage filter element assembly is already available at present, the composite filter element can greatly reduce the space occupation of the water purifier, the installation and the use are more convenient, the composite filter element can be integrally replaced, and the filter element can be more conveniently replaced.

Chinese utility model patent like patent No. ZL201921866766.2 (the publication number of granting is CN 210915578U) discloses a composite filter element, wherein, including the filter flask, this filter flask is inside to be equipped with preliminary treatment filter element group spare and meticulous filter element group spare along its axial, preliminary treatment filter element group spare includes at least tertiary filter core, be provided with between preliminary treatment filter element group spare and the meticulous filter element group spare and separate the end cover, separate and be provided with the intercommunication pipeline on the end cover, the entry and the delivery port of preliminary treatment filter element group spare of intercommunication pipeline are linked together, the export of intercommunication hole is linked together with the water inlet of meticulous filter element group spare.

The composite filter element arranges the pretreatment filter element assembly and the fine filter element assembly along the axial direction, so that the volume of the composite filter element is still larger, and further improvement on the composite filter element is still needed.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the first technical problem that will solve provides a composite filter element that volume is littleer to foretell technical situation.

The second technical problem to be solved by the present invention is to provide a water treatment device with the composite filter element.

The utility model provides a technical scheme that above-mentioned first technical problem adopted does: a composite filter element, comprising:

a housing having a hollow interior;

the preposed filtering module is arranged in the shell and is cylindrical;

a fine filter module disposed inside the housing and along a flow path of the fluid, the fine filter module being located downstream of the pre-filter module;

the method is characterized in that: the fine filtering module is positioned inside the front filtering module.

The composite filter element enables the preposed filter module and the fine filter module to be distributed along the radial direction by arranging the fine filter module in the preposed filter module, and the preposed filter module is usually laterally water inlet, so that the surface area of the circumferential wall of the preposed filter module is larger, the thickness of the preposed filter module can be reduced on the premise of ensuring the filtering effect of the preposed filter module, and the size of the composite filter element can be reduced.

In order to achieve better water treatment effect, a post-filter module is arranged inside the shell and is positioned downstream of the fine filter module along the flow path of the fluid.

In order to avoid overlarge cross section area of the shell, the shell is in a long strip shape, and the fine filtering module and the rear filtering module are arranged along the length direction of the shell.

In order to conveniently and reasonably arrange a water channel, the shell is provided with a water inlet, a purified water outlet and a concentrated water outlet, the water inlet is in fluid communication with the water inlet end of the front filter module, the purified water outlet is in fluid communication with the water outlet end of the rear filter module, and the concentrated water outlet is in fluid communication with the concentrated water outlet end of the fine filter module.

In order to facilitate the isolation of a purified water flow path and a concentrated water flow path, a first cavity and a second cavity positioned in the first cavity are arranged in the shell, a through hole is formed in the first cavity, the fine filtering module is arranged in the through hole in a penetrating manner, a concentrated water channel is formed between the first cavity and the second cavity and is positioned on a water flow path between a concentrated water discharge end and a concentrated water outlet of the fine filtering module; the second chamber is positioned on a water flow path between the purified water outlet end and the purified water outlet of the fine filtering module, and the post-filtering module is accommodated in the second chamber.

In order to facilitate the assembly and disassembly of the first chamber and the second chamber, an annular piece with a central hole as the through hole and a first core shell connected with the first end of the annular piece are arranged in the shell, the inner cavity of the first core shell is in fluid communication with the concentrated water outlet, and the first core shell and the annular piece jointly form at least a partial first chamber.

In order to facilitate the limitation and the support of the first end of the preposed filtering module, the second end of the annular piece is provided with a first annular groove, and the first end of the preposed filtering module is inserted into the first annular groove.

In order to have the strength and the filtering effect of the fine filtering module, the fine filtering module comprises a central pipe and a roll-type membrane, wherein the pipe wall of the central pipe is provided with an opening, and the roll-type membrane is wound on the central pipe.

In order to facilitate the pure water and the concentrated water filtered by the fine filtering module to be respectively conveyed to a second chamber and a concentrated water channel, the second chamber is provided with a first wall part opposite to the through hole, the first wall part is provided with a central joint and an annular part positioned on the periphery of the central joint, the central joint is inserted with the first end of the central pipe, and a first gap is formed between the surface of one side of the annular part facing the through hole and the end part of the first end of the roll-type membrane.

In order to facilitate the assembly and disassembly of the rear filter module, a connecting piece with a first wall part and a second core shell connected with the connecting piece are arranged in the first chamber, the inner cavity of the second core shell is in fluid communication with the purified water outlet, and the second core shell and the connecting piece together form at least a partial second chamber.

In a further design, the rear filter module comprises a first activated carbon filter element arranged on the periphery of the central joint.

In order to facilitate the limitation of the first activated carbon filter element, a first end cover opposite to the first wall part is arranged in the second cavity, and the rear filtering module is limited between the first end cover and the annular part; in order to facilitate the fluid communication between the water outlet end of the first activated carbon filter element and the purified water outlet, a second gap is formed between the first end cover and the inner wall of the second chamber, and the water outlet end of the post-filtration module is in fluid communication with the purified water outlet through the second gap.

In order to make the effect of the rear-mounted filter module better, the rear-mounted filter module further comprises an ultrafiltration membrane filter element arranged inside the first activated carbon filter element, and the ultrafiltration membrane filter element is positioned at the downstream of the first activated carbon filter element along the flow path of the fluid.

In order to limit the post-filtration module conveniently, and meanwhile, in order to conduct a water path of the post-filtration module, a second end cover and an annular cover are arranged in the second chamber at intervals, one side surface of the second end cover is opposite to the first wall part, the other side surface of the second end cover is opposite to the annular cover, a third gap is formed between one side surface of the second end cover and the first wall part, a water inlet end of the first active carbon filter element is communicated with the central joint through the third gap, the post-filtration module is limited between the other side surface of the second end cover and the annular cover, a fifth gap is formed between the other side surface of the second end cover and the end part of the ultrafiltration membrane filter element, and a water outlet end of the first active carbon filter element is communicated with the water inlet end of the ultrafiltration membrane filter element through the fifth gap; the centre bore of annular lid is located on the water flow path between the play water end of milipore filter core and the water purification export, just the surface of annular lid with be equipped with the sealing washer between the inner wall of second cavity, in order to completely cut off the end of intaking of first active carbon filter core with the centre bore of annular lid.

In a further design, the spiral-wound membrane is a reverse osmosis or nanofiltration membrane.

In order to limit and support the end parts of the front filtering module and the fine filtering module, a third end cover opposite to the second end of the annular piece is arranged in the shell, the third end cover is provided with a central groove and a second annular groove, the second end of the central pipe is inserted into the central groove, a fourth gap is formed between the end part of the second end of the spiral-wound membrane and the third end cover, and the second end of the front filtering module is inserted into the second annular groove.

In order to make the structure of the shell more compact, the water inlet, the purified water outlet and the concentrated water outlet are arranged at the same end of the shell.

The utility model provides a technical scheme that above-mentioned second technical problem adopted does: a water treatment device, characterized in that: a composite filter element as described above is applied.

Compared with the prior art, the utility model has the advantages of: composite filter core makes leading filtration module and meticulous filtration module radially distribute through setting up meticulous filtration module in leading filtration module's inside, because leading filtration module is the side direction generally and intakes, and this kind of design can make the superficial area of leading filtration module perisporium bigger to can reduce leading filtration module's thickness under the prerequisite of guaranteeing leading filtration module filter effect, and then can reduce composite filter core's volume.

Drawings

Fig. 1 is a three-dimensional structure diagram of embodiment 1 of the present invention;

FIG. 2 is a perspective view of a ring member in embodiment 1 of the present invention;

fig. 3 is a cross-sectional view of embodiment 1 of the present invention;

fig. 4 is a schematic structural diagram of a first chamber and a second chamber in embodiment 1 of the present invention;

fig. 5 is a schematic structural diagram of a second chamber in embodiment 1 of the present invention.

Fig. 6 is a cross-sectional view of embodiment 2 of the present invention;

fig. 7 is a schematic structural diagram of the first chamber and the second chamber in embodiment 2 of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the following embodiments.

Example 1

As shown in fig. 1 to 5, it is a first preferred embodiment of the present invention.

As shown in fig. 3, the composite filter element in this embodiment includes: the filter comprises a shell 1, a first chamber 2, a second chamber 3, a fine filter module 4, a front filter module 5, a rear filter module 6 and other main parts.

As shown in fig. 3, the housing 1 is cylindrical and hollow, and a water inlet 11, a purified water outlet 12 and a concentrated water outlet 13 are provided at the lower end of the housing 1. Inside the housing 1, the pre-filter module 5, the fine filter module 4 and the post-filter module 6 are distributed in succession along the water flow path. And the water inlet end of the pre-filter module 5 is communicated with the water inlet 11 in a fluid mode, the water outlet end of the post-filter module 6 is communicated with the purified water outlet 12 in a fluid mode, and the concentrated water outlet end of the fine filter module 4 is communicated with the concentrated water outlet 13 in a fluid mode.

The front-end filtering module 5 is PP cotton and/or a second active carbon filter element. The fine filtration module 4 comprises a central tube 41 provided with openings 411 in its tube wall and a wound membrane 42 wound around the central tube 41. The spiral wound membrane 42 is a reverse osmosis or nanofiltration membrane. The post-filtration module 6 includes a first activated carbon filter element 61 in a cylindrical shape and an ultrafiltration membrane filter element 62 disposed inside the first activated carbon filter element 61, and along a flow path of the fluid, the ultrafiltration membrane filter element 62 is located downstream of the first activated carbon filter element 61.

As shown in fig. 3, the pre-filter module 5 is cylindrical, the fine filter module 4 is located inside the pre-filter module 5, so that the pre-filter module 5 and the fine filter module 4 are distributed along the radial direction, and because the pre-filter module 5 is generally laterally water-feeding, the design can make the surface area of the peripheral wall of the pre-filter module 5 larger, thereby reducing the thickness of the pre-filter module 5 on the premise of ensuring the filtering effect of the pre-filter module 5, and further reducing the volume of the composite filter element. This meticulous filter module 4 and rearmounted filter module 6 arrange along the length direction of casing 1, can avoid the diameter too big of casing 1 that the outside that causes at rearmounted filter module 6 with meticulous filter module 4 suit.

As shown in fig. 3 and 4, the first chamber 2 is formed by a ring member 21 and a first core case 22. The central hole of the ring-shaped member 21 is a through hole 211, and the fine filter module 4 is inserted into the through hole 211. The second core shell 22 is connected to a first end 21a (i.e., a lower end in the drawing) of the ring member 21, and the lower end of the first core shell 22 is provided with a first outlet 221 communicating with the concentrated water outlet 13. The second chamber 3 is formed by a joint 31 and a second core shell 32 joined to the joint 31. The connecting member 31 is provided with a first wall portion 311 opposite to the through hole 211, the first wall portion 311 is provided with a center joint 3111 protruding upwards and a ring portion 3112 located at the periphery of the center joint 3111, the center joint 3111 is inserted into the first end 41a (i.e. the lower end in the figure) of the center pipe 41, and a first gap X is provided between one side surface of the ring portion 3112 facing the through hole 211 and the end of the first end 42a (i.e. the lower end in the figure) of the roll film 42. The first chamber 2 and the second chamber 3 form a concentrate passage 100 therebetween, and the first gap X and the first outlet 221 are both located in the concentrate passage 100, thereby facilitating communication between the concentrate discharge end of the fine filtration module 4 and the concentrate outlet 13.

As shown in fig. 4, the post-filter module 6 is housed in the second chamber 3. Specifically, the second chamber 3 is internally provided with a second end cover 34 and an annular cover 35 at intervals, the upper surface of the second end cover 34 is opposite to the first wall part 311, the lower surface of the second end cover 34 is opposite to the annular cover 35, a third gap Z is formed between the upper surface of the second end cover 34 and the first wall part 311, and the water inlet end of the first activated carbon filter element 61 is communicated with the central joint 3111 through the third gap Z; the rear-mounted filter module 6 is limited between the lower surface of the second end cap 34 and the annular cap 35, a fifth gap V (see fig. 5) is formed between the lower surface of the second end cap 34 and the end of the ultrafiltration membrane filter element 62, and the water outlet end of the first activated carbon filter element 61 is communicated with the water inlet end of the ultrafiltration membrane filter element 62 through the fifth gap V. The bottom wall of the second cartridge housing 32 is provided with a second outlet 321 located in the first outlet 221, the second outlet 321 being in communication with the clean water outlet 12, and the central aperture 351 of the annular cover 35 is located in the water flow path between the water outlet end of the ultrafiltration membrane cartridge 62 and the second outlet 321, such that the water outlet end of the ultrafiltration membrane cartridge 62 is in communication with the clean water outlet 12. A sealing ring 351 is provided between the outer circumferential surface of the ring cover 35 and the inner wall of the second chamber 3 to isolate the water inlet end of the first activated carbon filter element 61 from the central hole 351 of the ring cover 35.

As shown in fig. 3, the second end 21b (i.e., the upper end in the drawing) of the ring member 21 is provided with a first annular groove 212, and the first end 5a (i.e., the lower end in the drawing) of the pre-filter module 5 is inserted into the first annular groove 212. The third end cap 7 is arranged inside the housing 1 and opposite to the second end 21b of the ring-shaped member 21, the third end cap 7 is provided with a central groove 71 and a second annular groove 72, the second end 41b of the central pipe 41 is inserted into the central groove 71, a fourth gap W is formed between the end of the second end 42b of the wound membrane 42 and the third end cap 7, so as to facilitate the communication between the water inlet end of the fine filter module 4 and the water outlet end of the pre-filter module 5, and the second end 5b of the pre-filter module 5 is inserted into the second annular groove 72.

The water treatment path in this embodiment is:

the raw water enters the interior of the housing 1 from the water inlet 11, enters the interior of the pre-filter module 5 from the peripheral side of the pre-filter module 5, and flows out from the inner side surface of the pre-filter module 5, thereby completing the first stage filtration of water.

Subsequently, the water enters the end part of the second end 41b of the roll membrane 42 from the fourth gap W, and after being filtered by the roll membrane 42, pure water and concentrated water are generated, the pure water enters the inside of the central tube 41 through the opening on the central tube 41, and the concentrated water flows out from the end part of the first end 41a of the roll membrane 42, then enters the concentrated water channel 100 through the third gap Z, then flows out of the first chamber 2 through the first outlet 221, and finally is discharged from the concentrated water outlet 13, so that the second stage filtration of the water is completed.

Then, the purified water in the central tube 41 enters the third gap Z through the central joint 3111, then enters a space between the periphery of the first activated carbon filter element 61 and the second filter element housing 32 (i.e., a water inlet end of the post-filtration module 6), then enters a gap between the first activated carbon filter element 61 and the ultrafiltration membrane filter element 62 from the peripheral side of the first activated carbon filter element 61, then enters the interior of the ultrafiltration membrane filter element 62 through the fifth gap V, and then sequentially flows through a water outlet end of the ultrafiltration membrane filter element 62, the central hole 351 of the annular cover 35 and the second outlet 321 after being filtered by the ultrafiltration membrane filter element 62, and finally flows out from the purified water outlet 12, thereby completing the third-stage filtration of water.

The water treatment device in the embodiment is a water purifier, and the water treatment device is applied with the composite filter element.

Example 2

As shown in fig. 6 and 7, a second preferred embodiment of the present invention is provided.

This example differs from example 1 in that: the post-filter module 6 comprises only a first activated carbon filter element 61 in the form of a cylinder. The second chamber 3 is provided therein with a first end cap 33 opposite to the first wall 311, and the rear filter module 6 is limited between the first end cap 33 and the annular portion 3112. The first end cap 33 and the bottom wall of the second core housing 32 have a second gap Y therebetween, and the water outlet end of the post-filter module 6 is in fluid communication with the clean water outlet 12 through the second gap Y. Because the post-filter module 6 does not have the ultrafiltration membrane filter element 62, the length of the fine filter module 4 can be longer, and the length of the composite filter element can be further shortened.

The water treatment path in this embodiment is:

the first and second stages of filtration of the water were the same as in example 1. The third stage of water filtering process is as follows: the water enters the first activated carbon filter element 61 from the central joint 3111, then enters the interior of the first activated carbon filter element 61 in the radial direction, then flows out from the outer peripheral wall of the first activated carbon filter element 61, then flows through the second gap Y, the second outlet 321 in sequence, and finally flows out from the purified water outlet 12, thereby completing the third stage filtration of the water.

Terms indicating directions, such as "front", "rear", "upper", "lower", "left", "right", "side", "top", "bottom", and the like, are used in the specification and claims of the present invention to describe various example structural parts and elements of the present invention, but these terms are used herein only for convenience of description and are determined based on example orientations shown in the drawings. Because the disclosed embodiments may be arranged in different orientations, these directional terms are for illustrative purposes only and should not be construed as limiting, and for example, "upper" and "lower" are not necessarily limited to orientations opposite or consistent with the direction of gravity.

The term "fluid communication" as used herein refers to a spatial relationship between two components or portions (hereinafter, referred to as a first portion and a second portion) in a unified manner, i.e., a fluid (gas, liquid or a mixture thereof) can flow along a flow path from the first portion or/and be transported to the second portion, and may be directly communicated between the first portion and the second portion, or indirectly communicated between the first portion and the second portion via at least one third member, which may be a fluid passage such as a pipe, a channel, a duct, a flow guide member, a hole, a groove, or a chamber allowing the fluid to flow therethrough, or a combination thereof.

Claims (18)

1. A composite filter element, comprising:

a housing (1) having a hollow interior;

the front-mounted filter module (5) is arranged in the shell (1) and is cylindrical;

a fine filtration module (4) provided inside the housing (1) and along the flow path of the fluid, the fine filtration module (4) being located downstream of the pre-filtration module (5);

the method is characterized in that: the fine filter module (4) is positioned inside the front filter module (5).

2. The composite filter element of claim 1, wherein: the interior of the shell (1) is also provided with a post-filter module (6), and the post-filter module (6) is positioned at the downstream of the fine filter module (4) along the flow path of the fluid.

3. The composite filter element of claim 2, wherein: the shell (1) is in a long strip shape, and the fine filtering module (4) and the rear filtering module (6) are arranged along the length direction of the shell (1).

4. The composite filter element of claim 3, wherein: the shell (1) is provided with a water inlet (11), a purified water outlet (12) and a concentrated water outlet (13), the water inlet (11) is in fluid communication with the water inlet end of the front filter module (5), the purified water outlet (12) is in fluid communication with the water outlet end of the rear filter module (6), and the concentrated water outlet (13) is in fluid communication with the concentrated water outlet end of the fine filter module (4).

5. The composite filter element of claim 4, wherein: a first cavity (2) and a second cavity (3) located in the first cavity (2) are arranged in the shell (1), a through hole (211) is formed in the first cavity (2), the fine filtering module (4) is arranged in the through hole (211) in a penetrating mode, a concentrated water channel (100) is formed between the first cavity (2) and the second cavity (3), and the concentrated water channel (100) is located on a water flow path between a concentrated water discharging end and a concentrated water outlet (13) of the fine filtering module (4);

the second chamber (3) is positioned on a water flow path between a purified water outlet end of the fine filtering module (4) and the purified water outlet (12), and the post-filtering module (6) is accommodated in the second chamber (3).

6. The composite filter element of claim 5, wherein: the shell (1) is internally provided with a ring piece (21) with a central hole as the through hole (211) and a first core shell (22) connected with a first end (21 a) of the ring piece (21), the inner cavity of the first core shell (22) is in fluid communication with the concentrated water outlet (13), and the first core shell (22) and the ring piece (21) jointly form at least a partial first chamber (2).

7. The composite filter element of claim 6, wherein: the second end (21 b) of the annular part (21) is provided with a first annular groove (212), and the first end (5 a) of the front filter module (5) is inserted into the first annular groove (212).

8. The composite filter element of claim 5, wherein: the fine filtering module (4) comprises a central pipe (41) with an opening (411) on the pipe wall and a roll-type membrane (42) wound on the central pipe (41).

9. The composite filter element of claim 8, wherein: the second chamber (3) is provided with a first wall part (311) opposite to the through hole (211), a central joint (3111) and a ring-shaped part (3112) positioned on the periphery of the central joint (3111) are arranged on the first wall part (311), the central joint (3111) is inserted with a first end (41 a) of a central pipe (41), and a first gap (X) is reserved between one side surface of the ring-shaped part (3112) facing the through hole (211) and the first end (42 a) of the rolled film (42).

10. The composite filter element of claim 9, wherein: the first chamber (2) is internally provided with a connecting piece (31) with a first wall part (311) and a second core shell (32) connected with the connecting piece (31), the inner cavity of the second core shell (32) is communicated with the purified water outlet (12) in a fluid mode, and the second core shell (32) and the connecting piece (31) jointly form an at least partial second chamber (3).

11. The composite filter element of claim 9, wherein: rearmounted filter module (6) including locating central joint (3111) outlying first active carbon filter core (61).

12. The composite filter element of claim 11, wherein: the first end cover (33) opposite to the first wall portion (311) is arranged in the second chamber (3), the rear filtering module (6) is limited between the first end cover (33) and the annular portion (3112), a second gap (Y) is formed between the first end cover (33) and the inner wall of the second chamber (3), and the water outlet end of the rear filtering module (6) is in fluid communication with the purified water outlet (12) through the second gap (Y).

13. The composite filter element of claim 11, wherein: the post-filtration module (6) further comprises an ultrafiltration membrane filter element (62) arranged inside the first activated carbon filter element (61), and along the flow path of the fluid, the ultrafiltration membrane filter element (62) is positioned at the downstream of the first activated carbon filter element (61).

14. The composite filter element of claim 13, wherein: a second end cover (34) and an annular cover (35) are arranged in the second chamber (3) at intervals, one side surface of the second end cover (34) is opposite to the first wall part (311), the other side surface of the second end cover is opposite to the annular cover (35), a third gap (Z) is formed between one side surface of the second end cover (34) and the first wall part (311), the water inlet end of the first activated carbon filter element (61) is communicated with the central joint (3111) through the third gap (Z), the rear-mounted filter module (6) is limited between the other side surface of the second end cover (34) and the annular cover (35), a fifth gap (V) is formed between the other side surface of the second end cover (34) and the end part of the ultrafiltration membrane filter element (62), and the water outlet end of the first activated carbon filter element (61) is communicated with the water inlet end of the ultrafiltration membrane filter element (62) through the fifth gap (V); the central hole (352) of the annular cover (35) is positioned on a water flow path between the water outlet end of the ultrafiltration membrane filter element (62) and the purified water outlet (12), and a sealing ring (351) is arranged between the outer surface of the annular cover (35) and the inner wall of the second chamber (3) so as to isolate the water inlet end of the first activated carbon filter element (61) from the central hole (352) of the annular cover (35).

15. The composite filter element of claim 8, wherein: the spiral wound membrane (42) is a reverse osmosis membrane or a nanofiltration membrane.

16. The composite filter element of claim 8, wherein: the third end cover (7) opposite to the second end (21 b) of the annular piece (21) is arranged inside the shell (1), the third end cover (7) is provided with a central groove (71) and a second annular groove (72), the second end (41 b) of the central pipe (41) is inserted into the central groove (71), a fourth gap (W) is formed between the end of the second end (42 b) of the rolled membrane (42) and the third end cover (7), and the second end (5 b) of the front filtering module (5) is inserted into the second annular groove (72).

17. A composite filter element according to any one of claims 4 to 16, wherein: the water inlet (11), the purified water outlet (12) and the concentrated water outlet (13) are arranged at the same end of the shell (1).

18. A water treatment device, characterized in that: use of a composite filter element according to any one of claims 1 to 17.

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