CN211170127U - Filter element and water purifying device - Google Patents

Abstract

The utility model discloses a filter core and purifier, it relates to water treatment technical field, the filter core includes: a housing; a first filter assembly disposed in the housing, the first filter assembly including a center tube and a first filter membrane wound around the center tube; the filter comprises a central tube, a first filter assembly and a second filter assembly which are arranged in the central tube along the axial direction, wherein gaps are formed among the third filter assembly, the second filter assembly and the inner wall of the central tube, the gaps comprise a first gap between the second filter assembly and the inner wall of the central tube and a second gap between the third filter assembly and the inner wall of the central tube, and the first gap and the second gap are isolated. This application can optimize the size in order effectively to reduce the filter core to the structure.

Description

Filter element and water purifying device

Technical Field

The utility model relates to a water treatment technical field, in particular to filter core and purifier.

Background

In current purifier, adopt a plurality of filter cores of different functions among most devices to link together the most filter cores of different functions according to certain order, thereby the filter core that the coming water passes through individual different filtering capability filters, finally generates the water that is used for the user to use. Because a plurality of filter elements are installed in the device, the device is generally large in size, and each filter element has a service life, so that the filter elements are replaced relatively frequently, and a lot of troubles are brought to users.

In order to solve the above problems, an integrated composite filter element is currently on the market, which installs filter materials with different functions in a filter element through some sleeves, partitions, flow guide pipes and other parts. Because different filter materials must be isolated from each other, and simultaneously, water inlets, water outlets and the like made of different materials need to be correspondingly communicated through a guide pipe and the like so as to realize filtration with different functions, the existing integrated composite filter element has a complex internal structure and a larger volume, and particularly has a larger radial size, so that the integrated composite filter element is not easy to further reduce.

SUMMERY OF THE UTILITY MODEL

In order to overcome the above-mentioned defect of prior art, the embodiment of the utility model provides a technical problem that will solve provides a filter core and purifier, and it can optimize the size in order effectively to reduce the filter core to the structure.

The embodiment of the utility model provides a concrete technical scheme is:

a filter cartridge, comprising:

a housing; a first filter assembly disposed in the housing, the first filter assembly including a center tube and a first filter membrane wound around the center tube;

the filter comprises a central tube, a first filter assembly and a second filter assembly which are arranged in the central tube along the axial direction, wherein gaps are formed among the third filter assembly, the second filter assembly and the inner wall of the central tube, the gaps comprise a first gap between the second filter assembly and the inner wall of the central tube and a second gap between the third filter assembly and the inner wall of the central tube, and the first gap and the second gap are isolated.

Preferably, the central tube corresponding to the second gap has a through hole.

Preferably, the filtered water outlet side of the first filter membrane is an inner side wall.

Preferably, the first filtration membrane comprises at least a reverse osmosis membrane or a nanofiltration membrane.

Preferably, the filter cartridge further comprises: a divider for dividing the gap into the first gap and the second gap which are isolated.

Preferably, the third filter assembly includes a third filter element, the second gap being communicable with the third filter element.

Preferably, the third filter is provided in the partition, and an interior of the partition communicates with the second gap.

Preferably, the housing has opposite first and second ends, the third filter element being adjacent the second end, and the second filter element being adjacent the first end; the filter element further comprises: and the guide pipe penetrates through the second filtering assembly and is communicated with the inside of the separator.

Preferably, an end of the partition near the second end has an opening communicating the second gap with an interior of the partition; the honeycomb duct is connected at the separator is close to the one end of first end.

Preferably, the second filter assembly comprises a second filter element, the inner wall of the second filter element is the water outlet side, and the outer wall of the second filter element is the water inlet side; or the inner wall of the second filter member is a water inlet side, and the outer wall of the second filter member is a water outlet side.

Preferably, the second filter assembly further comprises a support frame arranged in the second filter element in a penetrating manner, the guide pipe is arranged in the support frame in a penetrating manner, and a waterway channel is formed in the support frame.

Preferably, the first end of the housing has a first inlet, a second inlet, a first outlet and a second outlet; the first inlet is communicated with the water inlet side of the second filtering component, and the first outlet is communicated with the water outlet side of the second filtering component; the second inlet is communicated with the end part of the first filtering membrane, and the second outlet is communicated with the flow guide pipe.

Preferably, the second filter assembly comprises a second filter element, the inner wall of the second filter element is the water outlet side, and the outer wall of the second filter element is the water inlet side; the first inlet communicates with the outer wall of the second filter element through the first gap; the second filtering component further comprises a support frame arranged in the second filtering piece in a penetrating mode, the guide pipe is arranged in the support frame in a penetrating mode, a water channel is formed in the support frame, and the first outlet is communicated with the inner wall of the second filtering piece through the water channel.

Preferably, the second filter assembly includes a second filter element, and the separator is disposed at an end of the second filter element facing the third filter assembly and serves to seal the end.

Preferably, the housing has a waste water outlet communicating with an outer side wall of the first filter membrane or an end of the filter membrane.

Preferably, the second filter assembly is a pre-treatment filter.

Preferably, the third filter assembly is a post-filter.

A water purification device, purifier includes as above-mentioned any one the filter core.

The technical scheme of the utility model following beneficial effect that is showing has:

the filter core in this application directly sets up second filter component and third filter component in first filter component's center tube to make third filter component second filter component with the clearance between the inner wall of center tube is separated into isolated first clearance and second clearance, has consequently satisfied the water that flows through third filter component and the aqueous phase that flows through second filter component and can not exert an influence each other. In the structure, other parts such as sleeves for isolation are not required to be arranged between the second filtering component and the first filtering component, so that the radial size of the filter element can be effectively reduced, the whole filter element is more miniaturized, the filter element is convenient to replace, and the limit condition of the installation position of the water purifying device with the filter element is reduced.

Specific embodiments of the present invention are disclosed in detail with reference to the following description and the accompanying drawings, which specify the manner in which the principles of the invention may be employed. It should be understood that the embodiments of the present invention are not so limited in scope. The embodiments of the invention include many variations, modifications and equivalents within the spirit and scope of the appended claims. Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments, in combination with or instead of the features of the other embodiments.

Drawings

The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way. In addition, the shapes, the proportional sizes, and the like of the respective members in the drawings are merely schematic for helping the understanding of the present invention, and do not specifically limit the shapes, the proportional sizes, and the like of the respective members of the present invention. The skilled person in the art can, under the teaching of the present invention, choose various possible shapes and proportional dimensions to implement the invention according to the specific situation.

Fig. 1 is a cross-sectional view of a filter cartridge according to an embodiment of the present invention.

Reference numerals of the above figures:

1. a housing; 11. a body; 12. a cover body; 13. a first end; 14. a second end; 15. a first inlet; 16. a second inlet; 17. a first outlet; 18. a second outlet; 19. a waste water outlet; 21. a central tube; 211. a through hole; 22. a first filter membrane; 3. a second filter assembly; 31. a second filter member; 32. a support frame; 4. a third filter assembly; 41. a third filter member; 51. a first gap; 52. a second gap; 6. a flow guide pipe; 7. a separator; 71. and (6) opening holes.

Detailed Description

The details of the present invention can be more clearly understood with reference to the accompanying drawings and the description of the embodiments of the present invention. However, the specific embodiments of the present invention described herein are for the purpose of explanation only, and should not be construed as limiting the invention in any way. Given the teachings of the present invention, the skilled person can conceive of any possible variants based on the invention, which should all be considered as belonging to the scope of the invention. It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "mounted," "connected," and "connected" are to be construed broadly and may include, for example, mechanical or electrical connections, communications between two elements, direct connections, indirect connections through intermediaries, and the like. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

In order to optimize the structure for effectively reducing the size of the filter element, a filter element is proposed in the present application, fig. 1 is a cross-sectional view of the filter element in the embodiment of the present invention, as shown in fig. 1, the filter element may include: a housing 1; a first filter assembly disposed in the housing 1, the first filter assembly including a center tube 21 and a first filter membrane 22 wound around the center tube 21; and the second filter assembly 3 and the third filter assembly 4 are arranged in the central tube 21 along the axial direction, gaps are formed among the third filter assembly 4, the second filter assembly 3 and the inner wall of the central tube 21, the gaps comprise a first gap 51 between the second filter assembly 3 and the inner wall of the central tube 21 and a second gap 52 between the third filter assembly 4 and the inner wall of the central tube 21, and the first gap 51 is separated from the second gap 52.

The filter element in the application directly sets up second filter assembly 3 and third filter assembly 4 in first filter assembly's center tube 21 to make the clearance between third filter assembly 4, second filter assembly 3 and the inner wall of center tube 21 be separated into isolated first clearance 51 and second clearance 52, consequently satisfied the water that flows through third filter assembly 4 and the aqueous phase that flows through second filter assembly 3 can not exert an influence each other. In the structure, other parts such as sleeves for isolation are not required to be arranged between the second filtering component 3 and the first filtering component, so that the radial size of the filter element can be effectively reduced, the whole filter element is more miniaturized, the filter element is convenient to replace, and the limit condition of the installation position of the water purifying device with the filter element is reduced.

In order to better understand the filter cartridge of the present application, it will be further explained and illustrated below. As shown in fig. 1, the housing 1 of the filter cartridge may have an axis extending in a vertical direction, and the entire housing 1 may extend substantially in the axial direction. In order to mount the first filter assembly, the second filter assembly 3 and the third filter assembly 4 in the housing 1, the housing 1 may have at least a body 11 and a cover 12, the body 11 may have a receiving cavity and a corresponding opening therein, the first filter assembly, the second filter assembly 3 and the third filter assembly 4 may be mounted in the receiving cavity from the opening, and the cover 12 is used for closing the opening of the body 11. The cover 12 and the body 11 may be connected by a screw connection, a snap connection, an adhesive connection, or the like.

As shown in fig. 1, a first filter assembly is provided in the housing 1, and the first filter assembly may include a center tube 21 and a first filter membrane 22 wound around the center tube 21. In one possible embodiment, the first filter membrane 22 may include at least a reverse osmosis membrane or a nanofiltration membrane, or the like.

As shown in fig. 1, a certain distance is provided between the outer sidewall of the first filtering element and the inner sidewall of the housing 1, the distance can form a wastewater flow channel, the filtered water outlet side of the first filtering membrane 22 is the inner sidewall, the wastewater outlet side of the first filtering membrane 22 is the outer sidewall, and the raw water inlet side of the first filtering membrane 22 is the upper end portion and/or the lower end portion. The raw water may enter the first filtering membrane 22 from the upper end portion and/or the lower end portion of the first filtering membrane 22 to be filtered, the filtered water after filtering may flow out from the inner wall, which is the filtered water outlet side of the first filtering membrane 22, and the waste water generated by the first filtering membrane 22 may flow into the waste water flow path from the waste water outlet side. The housing 1 may have a waste water outlet 19, and the waste water outlet 19 is connected to a waste water flow path such that the waste water outlet 19 communicates with an outer side wall of the first filtering membrane 22. The waste water outlet 19 may be located at the upper end, lower end or side wall of the housing 1.

In another embodiment, the filtered water outlet side of the first filtration membrane 22 is an inner wall, the waste water outlet side of the first filtration membrane 22 is an upper end portion and/or a lower end portion, and the raw water inlet side of the first filtration membrane 22 is an outer wall.

In a possible embodiment, as shown in fig. 1, the lower end of the first filtering assembly may be sleeved with a plugging member, which plugs the central tube 21 of the first filtering assembly and the lower end of the first filtering membrane 22, and simultaneously ensures that a stable distance is formed between the periphery of the first filtering membrane 22 and the inner wall of the casing 1, and the first filtering assembly does not shake in the casing 1.

As shown in fig. 1, the second filter module 3 and the third filter module 4 are disposed in the center tube 21 in the axial direction, and the lower end of the center tube 21 may be in a closed state. The second filter assembly 3 may be located above the third filter assembly 4. Gaps are provided between the third filter assembly 4, the second filter assembly 3 and the inner wall of the center tube 21, and may include a first gap 51 between the second filter assembly 3 and the inner wall of the center tube 21, and a second gap 52 between the third filter assembly 4 and the inner wall of the center tube 21.

The filter cartridge may include: a spacer 7 for separating the gap into a first gap 51 and a second gap 52 which are separated. As shown in fig. 1, the third filter assembly 4 may include a third filter element 41, and the second gap 52 may be in communication with the third filter element 41.

In a possible embodiment, the partition 7 may have a substantially cylindrical shape having an inner space, and the third filter 41 may be provided in the partition 7, and the inside of the partition 7 communicates with the second gap 52, so that the filtered water in the second gap 52 can flow to the third filter 41 in the third filter assembly 4 to be filtered through the third filter 41. The partition 7 may have an annular projection on a side wall thereof such that the partition 7 partitions the gap into a first gap 51 and a second gap 52 which are spaced apart, the second gap 52 being communicable with the third filter 41.

In order to connect the second gap 52 to the third filter element 41, in a possible embodiment, a through hole 211 is formed in the central tube 21 corresponding to the second gap 52, so that the filtered water flowing out of the inner side wall of the first filter membrane 22 of the first filter assembly can only flow into the second gap 52 through the through hole 211 of the central tube 21, but cannot flow into the first gap 51. Of course, in other possible embodiments, the lower end of the housing 1 may further be opened with a third outlet and a third inlet, the third outlet is connected to the second gap 52, the third inlet is connected to the third filtering element 41 assembly, and the third outlet and the third inlet may be connected by a pipeline outside the housing 1, so that the second gap 52 is communicated with the third filtering element 41.

Specifically, housing 1 may have opposite first and second ends 13, 14, as shown in fig. 1, first end 13 may be an upper end, second end 14 may be a lower end, third filter element 41 may be adjacent second end 14, and second filter element 3 may be adjacent first end 13. The filter cartridge may further include: and the guide pipe 6 penetrates through the second filtering component 3, and the guide pipe 6 is communicated with the inside of the separator 7. The end of the partition 7 near the second end 14 has an opening 71 communicating the second gap 52 with the inside of the partition 7. The draft tube 6 is connected to the partition 7 at an end thereof adjacent to the first end 13. The filtered water in the second gap 52 can flow downward to the opening 71 at the end of the partition 7 near the second end 14, and flow into the third filter 41 in the partition 7 through the opening 71, and the filtered water flows out from the end of the partition 7 near the first end 13 to the flow guide pipe 6 after being filtered by the third filter 41 from bottom to top. Through the above manner, the filtered water can uniformly pass through the third filtering piece 41, the utilization rate of the third filtering piece 41 is high, and the filtered water is prevented from only intensively flowing through the partial area of the third filtering piece 41.

In an alternative embodiment, the third filter assembly 4 may be a post filter.

As shown in fig. 1, the second filter assembly 3 may include a second filter member 31, an inner wall of the second filter member 31 being a water outlet side, and an outer wall of the second filter member 31 being a water inlet side; or the inner wall of the second filter member 31 is the water inlet side, and the outer wall of the second filter member 31 is the water outlet side. Since the first gap 51 between the second filter element 3 and the central tube 21 is isolated from the second gap 52, water from the outlet side or the inlet side of the second filter element 3 does not interfere with the second gap 52. The raw water flowing in from the housing 1 may flow to the first gap 51, enter the second filter member 31 through the outer wall of the second filter member 31, be filtered, flow out from the side wall of the second filter member 31, and then flow out of the housing 1. Or the raw water flowing in from the housing 1 may flow into the inner side wall of the second filter member 31, enter the second filter member 31 for filtering, flow out from the outer wall of the second filter member 31 to the first gap 51, and then flow out of the housing 1.

Preferably, the second filter assembly 3 may further include a support frame 32 disposed in the second filter member 31, the flow guide tube 6 is disposed in the support frame 32, and the support frame 32 may form a water passage between the flow guide tube 6 and the second filter member 31.

In an alternative embodiment, the second filter assembly 3 may be a pre-treatment filter.

In a possible embodiment, a partition 7 may be provided at the end of the second filter element 31 facing the third filter assembly 4 and used to seal this end, the outer edge of the partition 7 abutting the inner wall of the central tube 21 separating the gap into a first gap 51 and a second gap 52 which are spaced apart. In this embodiment, the filter cartridge may include: the draft tube 6 penetrating the second filter assembly 3, the partition 7 seals the lower end of the second filter member 31 of the draft tube 6 and the outer wall of the draft tube 6 at the same time, so that the draft tube 6 is communicated with the third filter member 41 only. With the above configuration, the water passing through the third filter 41 does not interfere with the water passing through the second filter 31. Preferably, the partition 7 and the draft tube 6 may be integrally formed.

In one possible embodiment, as shown in fig. 1, the housing 1 may have a first inlet 15, a second inlet 16, a first outlet 17, and a second outlet 18; the first inlet 15 is communicated with the water inlet side of the second filtering component 3, and the first outlet 17 is communicated with the water outlet side of the second filtering component 3; the second inlet 16 communicates with the end of the first filter membrane 22 and the second outlet 18 communicates with the flow-guide tube 6. The first inlet 15, the first outlet 17 and the second outlet 18 may be located at the first end 13 of the housing 1 and the second inlet 16 may be located at the first end 13 and/or the second end 14 of the housing 1.

In one particular embodiment, as shown in fig. 1, the first inlet 15 communicates with the outer wall of the second filter member 31 through the first gap 51; the first outlet 17 communicates with the inner wall of the second filter 31 through a water passage. Raw water flows into the shell 1 from the first inlet 15 of the shell 1, then flows out of the shell 1 from the first outlet 17 after being filtered by the second filter element 31, then flows into the shell 1 through the second inlet 16, flows into the first filter membrane 22 from two ends or one end of the first filter membrane 22 of the first filter assembly for filtering, and filtered water flows out from the inner wall of the first filter membrane 22; or the filtered water flows into the first filtering membrane 22 from the outer side wall of the first filtering membrane 22 of the first filtering assembly for filtering, and the filtered water flows out from the inner wall of the first filtering membrane 22; and then enters the second gap 52 through the through hole 211 of the center tube 21 or flows out from the third outlet of the housing 1, and then flows into the second gap 52 in the housing 1 from the third inlet through a pipeline outside the housing 1. The wastewater generated by the first filtering membrane 22 flows out from the outer side wall of the first filtering membrane 22, passes through the space between the first filtering membrane 22 and the shell 1 and is discharged from the wastewater outlet 19 on the shell 1; or from the end of the first filter membrane 22 and then from the waste water outlet 19 in the housing 1. The filtered water in the second gap 52 flows down below the partition 7, flows into the partition 7 through the lower end of the partition 7, passes through the third filter element 41 in the partition 7, re-enters the flow guide tube 6, is directed through the flow guide tube 6, passes through the second filter assembly 3 and flows out of the housing 1 from the second outlet 18; alternatively, the filtered water in the second gap 52 passes directly through the third filter element 41 and into the flow conduit 6, and the filtered water is directed through the flow conduit 6 through the second filter assembly 3 and out of the housing 1 through the second outlet 18.

The application also provides a water purifying device which comprises the filter element as in any one of the above.

The filter core in this application can be integrated the first filtering component of three kinds of different functions simultaneously, second filtering component 3 and third filtering component 4, only need install a filter core just can satisfy the filtration demand of three kinds of differences when purifier, first filtering component in the purifier, second filtering component 3 and the 4 life-spans of third filtering component reach the back, only need change a filter core can, can effectively reduce the frequency that the user changed filtering component. In addition, the filter element skillfully utilizes the central tube 21 and the separator 7, so that other parts such as sleeves are not needed in the filter element, and the radial size of the filter element is effectively reduced.

All articles and references disclosed, including patent applications and publications, are hereby incorporated by reference for all purposes. The term "consisting essentially of …" describing a combination shall include the identified element, ingredient, component or step as well as other elements, ingredients, components or steps that do not materially affect the basic novel characteristics of the combination. The use of the terms "comprising" or "including" to describe combinations of elements, components, or steps herein also contemplates embodiments that consist essentially of such elements, components, or steps. By using the term "may" herein, it is intended to indicate that any of the described attributes that "may" include are optional. A plurality of elements, components, parts or steps can be provided by a single integrated element, component, part or step. Alternatively, a single integrated element, component, part or step may be divided into separate plural elements, components, parts or steps. The disclosure of "a" or "an" to describe an element, ingredient, component or step is not intended to foreclose other elements, ingredients, components or steps.

The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose of the embodiments is to enable people skilled in the art to understand the contents of the present invention and to implement the present invention, which cannot limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.

Claims (18)

1. A filter cartridge, comprising:

a housing; a first filter assembly disposed in the housing, the first filter assembly including a center tube and a first filter membrane wound around the center tube;

the filter comprises a central tube, a first filter assembly and a second filter assembly which are arranged in the central tube along the axial direction, wherein gaps are formed among the third filter assembly, the second filter assembly and the inner wall of the central tube, the gaps comprise a first gap between the second filter assembly and the inner wall of the central tube and a second gap between the third filter assembly and the inner wall of the central tube, and the first gap and the second gap are isolated.

2. The filter cartridge of claim 1, wherein the second gap corresponds to a through-hole in the center tube.

3. The filter cartridge of claim 1, wherein the filtered water outlet side of the first filter membrane is an inner sidewall.

4. The filter cartridge of claim 1, wherein the first filter membrane comprises at least a reverse osmosis membrane or a nanofiltration membrane.

5. The filter cartridge of claim 1, further comprising: a divider for dividing the gap into the first gap and the second gap which are isolated.

6. The filter cartridge according to claim 5 wherein said third filter assembly includes a third filter element, said second gap communicable with said third filter element.

7. The filter cartridge according to claim 6, wherein said third filter member is disposed in said partition, an interior of said partition communicating with said second gap.

8. The filter cartridge according to claim 7 wherein said housing has opposite first and second ends, said third filter element being adjacent said second end, said second filter assembly being adjacent said first end; the filter element further comprises: and the guide pipe penetrates through the second filtering assembly and is communicated with the inside of the separator.

9. The filter cartridge of claim 8, wherein an end of the partition adjacent the second end has an opening communicating the second gap with an interior of the partition; the honeycomb duct is connected at the separator is close to the one end of first end.

10. The filter cartridge according to claim 8 wherein said second filter assembly comprises a second filter member, the inner wall of said second filter member being the water outlet side and the outer wall of said second filter member being the water inlet side; or the inner wall of the second filter member is a water inlet side, and the outer wall of the second filter member is a water outlet side.

11. The filter cartridge of claim 10, wherein the second filter assembly further comprises a support frame disposed through the second filter element, the flow conduit extending through the support frame, the support frame having a waterway channel formed therein.

12. The filter cartridge of claim 8, wherein the first end of the housing has a first inlet, a second inlet, a first outlet, and a second outlet; the first inlet is communicated with the water inlet side of the second filtering component, and the first outlet is communicated with the water outlet side of the second filtering component; the second inlet is communicated with the end part of the first filtering membrane, and the second outlet is communicated with the flow guide pipe.

13. The filter cartridge according to claim 12 wherein said second filter assembly comprises a second filter member, the inner wall of said second filter member being the water outlet side and the outer wall of said second filter member being the water inlet side; the first inlet communicates with the outer wall of the second filter element through the first gap; the second filtering component further comprises a support frame arranged in the second filtering piece in a penetrating mode, the guide pipe is arranged in the support frame in a penetrating mode, a water channel is formed in the support frame, and the first outlet is communicated with the inner wall of the second filtering piece through the water channel.

14. The filter cartridge according to claim 5 wherein said second filter assembly includes a second filter element, said partition being disposed at an end of said second filter element facing said third filter assembly and adapted to seal against said end.

15. The filter cartridge according to claim 3 wherein said housing has a waste water outlet therein, said waste water outlet communicating with an outer side wall of said first filter membrane or an end of said filter membrane.

16. The filter cartridge according to claim 1 wherein the second filter assembly is a pre-treatment filter.

17. The filter cartridge according to claim 1 wherein said third filter assembly is a post-filter.

18. A water purification device, characterized in that it comprises a filter cartridge according to any one of claims 1 to 17.

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