CN113149134B

CN113149134B - Filter head, filter and filter unit

Info

Publication number: CN113149134B
Application number: CN202110377771.2A
Authority: CN
Inventors: 仇必勇; 郑滇; 乔恩·克拉格内斯
Original assignee: 3M Material Technology Guangzhou Co Ltd
Current assignee: Shuwanuo Material Technology Guangzhou Co ltd
Priority date: 2021-04-08
Filing date: 2021-04-08
Publication date: 2024-01-02
Anticipated expiration: 2041-04-08
Also published as: CN113149134A

Abstract

The invention relates to a filter head, a filter and a filter unit. The filter head comprises: a filter head housing; the valve body is arranged in the inner cavity of the shell body; and a filter head base fixedly mounted to the filter head housing to confine the valve body within the filter head housing. The shell body is provided with a raw water port, a first water outlet port and a second water outlet port. The valve body is configured to be rotatable relative to the filter head housing to a conductive position in which the interior cavity of the valve body is in fluid communication with the raw water port, the first water outlet port, and the second water outlet port, or to a closed position in which the interior cavity of the valve body is not in fluid communication with none of the raw water port, the first water outlet port, and the second water outlet port. The filter head, the filter and the filter unit according to the present invention can perform the disassembly and the assembly of the filter cartridge without closing the fluid line connected to the filter, and can effectively prevent the backflow and the mixing of the fluid by providing a proper seal between the valve body and the filter head housing.

Description

Filter head, filter and filter unit

Technical Field

The present invention relates to the field of filtration, and more particularly, to a filter head for a filter, a filter having the same, and a filter unit having the same.

Background

The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.

Filters are widely used in industrial production and daily life, and are commonly used for filtering various fluids. The water purifier is used as a common filter and is widely applied to domestic water systems, so that the pollution of water sources, conveying processes and the like to water and the influence on water quality are eliminated, and the water use safety is ensured. The filter mainly comprises a filter element and a filter head. Raw water flows into the filter element, and product water obtained after filtering by the filter element flows out of the fluid outlet of the filter head. During use of the filter, it is often necessary to replace the filter element, for example, periodically, depending on the condition of the filter element, to ensure that the filter provides effective filtration. When changing the filter core, involve the installation and dismantlement between filter core and the filter head. It is often necessary to close the valves of the various fluid lines of the filter and then remove the cartridge from the filter head and install a new cartridge, the installation between the cartridge and the filter head being necessary to prevent backflow and mixing of the fluids of the different fluid lines.

For this reason, it is desirable to provide a new filter that is simple to install and remove between the cartridge and the filter head and that provides effective isolation between the fluid lines.

Disclosure of Invention

The invention aims to provide an improved filter head, a filter and a filter unit, which can simplify the installation and the disassembly between a filter element and the filter head and effectively prevent the backflow and the mixing of fluids of various fluid pipelines.

One aspect of the present invention provides a filter head comprising: a filter head housing comprising a hollow housing body; the valve body is arranged in the inner cavity of the shell body and comprises a hollow valve body, and a fluid inlet and a fluid outlet of the filter element are to be accommodated in the inner cavity of the valve body; and a filter head base mounted to the filter head housing to confine the valve body within the filter head housing. The shell body is provided with a raw water port, a first water outlet port and a second water outlet port which are communicated with the inner cavity of the shell body. The valve body is configured to be rotatable relative to the filter head housing to a conductive position in which the interior cavity of the valve body is in fluid communication with the raw water port, the first water outlet port, and the second water outlet port, or to a closed position in which the interior cavity of the valve body is not in fluid communication with none of the raw water port, the first water outlet port, and the second water outlet port.

In one embodiment, the peripheral wall of the valve body is provided with a first set of through holes and a second set of through holes spaced apart from each other in the axial direction of the valve body, the lateral wall of the valve body is provided with an inner cylindrical portion extending through the lateral wall in the axial direction and having a first inner cylindrical portion located axially above the lateral wall, the first inner cylindrical portion being provided with an opening portion. In the on position, one of the first set of through holes is in fluid communication with the raw water port, one of the second set of through holes is in fluid communication with the first water outlet port, and the opening is in fluid communication with the second water outlet port. In the closed position, none of the first set of through holes is in fluid communication with the raw water port, none of the second set of through holes is in fluid communication with the first outlet port, and the opening is not in fluid communication with the second outlet port.

In one embodiment, the housing body is further provided with an annular wall extending axially from the top wall of the housing body in the interior cavity of the housing body, the annular wall being provided with a notch at an axial end thereof, the annular wall being in sealing engagement with the first inner barrel portion. In the on position, the opening is in fluid communication with the second outlet port via the slot. In the closed position, the opening is completely blocked by the annular wall.

In one embodiment, one of the housing body and the valve body is provided with a first limit portion and the other of the housing body and the valve body is provided with a second limit portion, the first limit portion and the second limit portion together defining a rotational range of the valve body relative to the filter head housing.

In one embodiment, the opening includes a first opening and a second opening that are circumferentially spaced apart. The slots include first and second slots that are circumferentially spaced apart such that an axial end of the annular wall is formed with first and second arcuate walls that are circumferentially spaced apart from one another. In the on position, the first opening and the second opening are in fluid communication with the second outlet port via the first slot and the second slot, respectively. In the closed position, the first opening and the second opening are completely blocked by the first arc wall and the second arc wall, respectively.

In one embodiment, the first stop is a stop protrusion disposed on an axial end of the first arcuate wall and the second stop is a stop groove disposed on a lateral wall of the valve body.

In one embodiment, annular first, second and third seals are provided between the peripheral wall of the valve body and the peripheral wall of the housing body, the first seal being located axially below the first set of through holes, the second seal being located between the first and second sets of through holes, and the third seal being disposed axially above the second set of through holes and axially below the second water outlet port.

In one embodiment, an annular seal is provided around each of the first and second sets of through holes.

The filter head housing further includes a housing flange located radially outward of the housing body, and in an inner cavity of the filter head housing, a housing step portion is formed between the housing body and the housing flange, the housing step portion and the filter head base together maintaining an axial position of the valve body.

The valve body further includes a valve body flange located radially outside the valve body, and in an inner cavity of the valve body, a valve body step portion is formed between the valve body and the valve body flange, wherein the valve body flange is installed between the filter head base and the housing step portion.

The inner surface of the peripheral wall of the valve body flange is provided with a protrusion configured to be operated to rotate the valve body relative to the filter head housing.

In one embodiment, the housing body is provided with a first group of tubular portions, one of which forms a raw water port, a second group of tubular portions, one of which forms a first water outlet port, and a third group of tubular portions, one of which forms a second water outlet port, spaced apart from each other in an axial direction of the housing body.

In one embodiment, the raw water port, the first water outlet port, and the second water outlet port are axially aligned.

In one embodiment, the outer peripheral wall of the housing body is provided with a rib extending circumferentially along the outer peripheral wall of the housing body.

The rib includes a first annular rib disposed between the first set of tubular portions and the second set of tubular portions and a second annular rib disposed between the second set of tubular portions and the third set of tubular portions. And/or the rib comprises an arcuate rib extending circumferentially along the outer peripheral wall of the housing body between the tubular portions of each of the first, second and third sets of tubular portions.

In one embodiment, the first, second, third, and ribs of the housing body are integrally formed by injection molding.

Another aspect of the invention is to provide a filter comprising a filter cartridge provided with a fluid inlet and a fluid outlet. The filter further comprises a filter head according to the invention. The fluid inlet and the fluid outlet of the filter element are mounted in the inner cavity of the valve body of the filter head, the fluid inlet is in fluid communication with the raw water port, and the fluid outlet is in communication with one or both of the first water outlet port and the second water outlet port.

In one embodiment, the fluid outlet comprises a first fluid outlet in fluid communication with the first water outlet port and a second fluid outlet in fluid communication with the second water outlet port.

The cartridge is provided with a retaining recess that mates to a protrusion of the valve body so that the valve body can rotate with the cartridge to either the on position or the off position.

The filter element is provided with a mounting portion, the inner wall of the filter head base is provided with a holding portion, when the valve body rotates with the filter element, the mounting portion moves along the holding portion, the mounting portion is limited between the holding portion and the valve body step portion of the valve body in the on position, and the mounting portion is separated from the holding portion in the off position.

In one embodiment, the holding recess is provided on the mounting portion.

It is a further aspect of the present invention to provide a filter assembly comprising a plurality of filters according to the present invention, the plurality of filters being in fluid connection with each other.

The plurality of filters includes a first filter and a second filter, and the filter unit is provided with: a water inlet connected to a raw water port of the first filter; a first water outlet connected to a second water outlet port of the first filter; the second water outlet is connected to the first water outlet port of the second filter; and a third water outlet connected to the second water outlet port of the second filter. The first water outlet port of the first filter is connected to the raw water port of the second filter.

In one embodiment, the plurality of filters further comprises a third filter.

One of the raw water port, the first water outlet port, and the second water outlet port of the second filter is in fluid communication with the raw water port of the third filter.

In one embodiment, the raw water port of the second filter is in fluid communication with the raw water port of the third filter, the first outlet port of the third filter is connected to the second outlet port, and the second outlet port of the third filter is connected to the third outlet port.

In one embodiment, the filter element of the first filter is a prefilter composite filter element and the filter element of the second filter is a reverse osmosis membrane filter element.

The invention enables the disassembly and assembly of the filter element without closing the fluid pipeline connected to the filter or the filter unit by arranging the valve body in the filter head shell, arranging the fluid inlet and the fluid outlet of the filter element in the valve body, arranging the valve body to be capable of rotating to a conducting position or a closing position relative to the filter head shell so as to enable the raw water port, the first water outlet port and the second water outlet port of the filter head to be in fluid communication or not to be in fluid communication with the inner cavity of the valve body, and can effectively prevent the backflow and the mixing of the fluid by providing proper sealing between the valve body and the filter head shell.

Drawings

Embodiments of the present invention will be described below, by way of example only, with reference to the accompanying drawings. In the drawings, like features or components are denoted by like reference numerals and the drawings are not necessarily drawn to scale and in which:

fig. 1 shows a cross-sectional view of a filter according to a first embodiment of the invention;

FIG. 2 shows a partial enlarged view of the filter of FIG. 1;

FIG. 3 shows a partial perspective view of a filter cartridge of the filter of FIG. 1;

FIGS. 4 and 5 show partial cutaway perspective views of the filter head of the filter of FIG. 1;

FIG. 6 shows a partial perspective view of the filter head of the filter of FIG. 1;

fig. 7 to 9 show perspective views of the valve body of the filter head of fig. 4 and 5, respectively, from different angles;

fig. 10 shows a perspective view of the filter head of fig. 4 and 5;

FIG. 11 shows a cross-sectional view taken along section line A-A in FIG. 4;

FIG. 12 shows a cross-sectional view taken along section line C-C in FIG. 11;

FIG. 13 shows a cross-sectional view taken along section line B-B in FIG. 5;

FIG. 14 shows a cross-sectional view taken along section line D-D in FIG. 13;

fig. 15 shows a cross-sectional view of a filter head of a filter according to a first modified example of the invention;

fig. 16 shows a cross-sectional view of a filter head of a filter according to a second modified example of the invention;

FIG. 17 shows a cross-sectional view of a filter assembly according to the present invention;

FIG. 18 shows a partial cross-sectional view of one cartridge of the filter assembly of FIG. 17;

FIG. 19 shows a cross-sectional view of another filter assembly according to the present invention; and

fig. 20 shows a partial enlarged view of fig. 19.

Detailed Description

The following description is merely exemplary in nature and is not intended to limit the present disclosure, application, or uses. It should be understood that throughout the drawings, like reference numerals refer to the same or like parts and features. The drawings are merely schematic representations, not necessarily showing the specific dimensions and proportions of the various embodiments of the invention. Specific details or structures may be shown in exaggerated form in particular figures to illustrate related details or structures of embodiments of the invention.

In describing embodiments of the present invention, directional terms used in connection with "upper" and "lower" are described in terms of upper and lower positions of the views shown in the drawings. In practical use, the positional relationships of "upper" and "lower" used herein may be defined according to practical circumstances, and these relationships may be reversed.

The filter head according to the invention can be applied to various filters and filter sets, which can be used for filtering municipal tap water as well as other fluids. The filter head according to the present invention and the filter having the same will be described below with reference to the accompanying drawings by taking the application of the filter to a municipal tap water filtration system as an example.

Fig. 1 shows a cross-sectional view of a filter 1 according to a first embodiment of the invention, fig. 2 shows an enlarged partial view of fig. 1.

As shown in fig. 1 and 2, the filter 1 includes a filter cartridge 10 and a filter head 20 mounted to each other. The filter 1 is configured to treat raw water (e.g., municipal tap water) and provide two-way water outlet, including a raw water port P1, a first water outlet port P2, and a second water outlet port P3, which are provided on the filter head 20. The raw water port P1 may be connected to a raw water line (e.g., municipal tap water line). Fig. 3 shows a partial perspective view of the filter cartridge 10. As shown in fig. 1 to 3, the filter element 10 has a housing 11 and a filter medium 12 accommodated in the housing 11. The cartridge 10 is provided with a fluid inlet and a fluid outlet. The cartridge 10 may be provided with one fluid inlet or with a plurality of fluid inlets spaced apart from one another. In this example, the cartridge 10 is provided with two fluid inlets 111 spaced apart from each other, and with a first fluid outlet 112 and a second fluid outlet 113. When the filter cartridge 10 and the filter head 20 are mounted in place, the fluid inlet 111 of the filter cartridge 10 is in fluid communication with the raw water port P1 of the filter 1, and the first and second fluid outlets 112, 113 of the filter cartridge 10 are in fluid communication with the first and second water outlet ports P2, P3 of the filter 1, respectively. The cartridge 10 is also provided with a mounting portion 114 and a retaining recess 115 (shown only in fig. 3) provided on the mounting portion 114. The mounting portion 114 is provided on the housing top cover of the housing 11. The upper surface of the mounting portion 114 is a flat surface, and the lower surface of the mounting portion 114 is a spiral surface. When the cartridge 10 is mounted to the filter head 20, the lower surface of the mounting portion 114 and the retaining recess 115 cooperate with corresponding portions of the filter head 20, as will be described below.

As shown in fig. 1 and 2, raw water enters the filter 1 through the raw water port P1 and enters the raw water channel L1 in the filter element 10 through the fluid inlet 111. The raw water entering the raw water channel L1 is treated by the filter medium 12 of the filter element 10 to obtain a first outflow fluid and a second outflow fluid. The first outlet fluid flows into the first outlet channel L2, out of the cartridge 10 through the first fluid outlet 112, and may flow out of the filter 1 from the first outlet port P2 for use or further processing. The second outlet fluid flows into the second outlet channel L3, out of the cartridge 10 via the second fluid outlet 113, and may flow out of the filter 1 from the second outlet port P3 for use or further processing.

In the example shown in the figures, the filter cartridge 10 is a reverse osmosis membrane cartridge and the filter medium 12 comprises a reverse osmosis membrane, the first effluent fluid being pure water and the second effluent fluid being concentrated water. However, the invention is not so limited, and in other examples according to the invention, the cartridge 10 may be other types of cartridges, and thus the first and second effluent fluids may be other fluids after treatment of the cartridge. For example, in one example, the filter media 12 of the filter cartridge 10 can comprise a multi-stage filter media, the filter cartridge 10 being configured to filter raw water to different degrees and to provide two product fluids that are filtered to different degrees, respectively, and the first and second outgoing fluids can be the filtered first and second product fluids, respectively.

Fig. 4 and 5 show a partially cut-away perspective view of the filter head 20 in different installation states, respectively. Filter head 20 includes a filter head housing 30, a valve body 40 mounted within filter head housing 30, and a filter head base 50.

The filter head housing 30 includes a housing body 31 having a bottomed cylindrical shape and a housing flange 32. The peripheral wall of the housing body 31 is provided with a plurality of tubular portions. In the present example, the peripheral wall of the housing body 31 is provided with a first group of tubular portions, a second group of tubular portions, and a third group of tubular portions that are spaced apart from each other in the axial direction of the housing body 31. The first set of tubular portions comprises a first tubular portion 311, a fourth tubular portion 314, which are substantially at the same axial height. The second set of tubular portions comprises a second tubular portion 312, a fifth tubular portion 315, which are located at substantially the same axial height. The third set of tubular portions comprises a third tubular portion 313, a sixth tubular portion 316, which are substantially at the same axial level. The first tubular portion 311, the second tubular portion 312, and the third tubular portion 313 are aligned in the axial direction of the housing body 31, and extend radially outward from the housing body 31. The fourth, fifth, and sixth tubular portions 314, 315, 316 are aligned in the axial direction of the housing body 31 and extend radially outward from the housing body 31. At least one tubular portion of the first set of tubular portions is in fluid communication with the interior cavity of the housing body 31 to form the raw water port P1 of the filter 1, at least one tubular portion of the second set of tubular portions is in fluid communication with the interior cavity of the housing body 31 to form the first water outlet port P2 of the filter 1, and at least one tubular portion of the third set of tubular portions is in fluid communication with the interior cavity of the housing body 31 to form the second water outlet port P3 of the filter 1. In the present example shown in fig. 4 and 5, the first tubular portion 311 forms the raw water port P1 of the filter 1, the second tubular portion 312 forms the first water outlet port P2 of the filter 1, and the third tubular portion 313 forms the second water outlet port P3 of the filter 1.

The housing flange 32 extends radially outward from an open end (lower end in fig. 4 and 5) of the housing body 31 and extends in the axial direction, and an inner surface of a peripheral wall of the housing flange 32 is located radially outward of an inner surface of the peripheral wall of the housing body 31, so that a housing step 321 is formed between the inner surface of the peripheral wall of the housing body 31 and the inner surface of the peripheral wall of the housing flange 32 in the inner cavity of the filter head housing 30. The axial end face of the housing flange 32 is provided with a plurality of mounting holes 322 that are circumferentially spaced apart from each other. Mounting holes 322 are configured to mate with a filter head base 50 described below.

The filter head housing 30 is further provided with an annular wall 33 extending axially from the top wall 317 of the housing body 31 in the interior cavity of the housing body 31. Fig. 6 shows a partial perspective view of the filter head housing 30, showing the annular wall 33. The axial end of the annular wall 33 is provided with one or more notches. In the example shown in fig. 6, the axial end of the annular wall 33 is provided with first and second notches 335 and 336 that are circumferentially spaced apart and symmetrically disposed such that the axial end of the annular wall 33 is formed with first and second axially extending arc-shaped walls 331 and 332, the first and second arc-shaped walls 331 and 332 being circumferentially spaced apart and symmetrically disposed from each other. An axial end of one of the first arc-shaped wall 331 and the second arc-shaped wall 332 is provided with a stopper protrusion 333. In the example shown in the drawings, the limit projection 333 is provided on an axial end portion of the first arc wall 331. The first arc wall 331 and the second arc wall 332 cooperate with a valve body 40 to be described later.

Preferably, the outer circumferential wall of the housing body 31 of the filter head housing 30 is provided with ribs extending circumferentially along the outer circumferential wall of the housing body 31 to improve the strength of the housing body 31. In the embodiment shown in fig. 4 and 5, the rib on the outer peripheral wall of the housing body 31 of the filter head housing 30 includes a first annular rib 318 and a second annular rib 319. The first annular rib 318 is provided between the first group tubular portion and the second group tubular portion in the axial direction of the housing body 31, and extends circumferentially along the outer peripheral wall of the housing body 31. The second annular rib 319 is provided between the second group tubular portion and the third group tubular portion in the axial direction of the housing body 31, extending circumferentially along the outer peripheral wall of the housing body 31 substantially parallel to the first annular rib 318.

In one embodiment, portions of the filter head housing 30 are integrally formed by injection molding. In injection molding the above-described portions of the filter head housing 30, for example, when forming the tubular portions of the filter head housing 30, the molten injection fluid flows separately around the inner mold and then merges between the adjacent tubular portions. The strength of the portions of the filter head housing 30 formed may not be uniform and the strength of the molten injection fluid at the junction between adjacent tubular portions may be weak. By integrally forming the above-described first annular rib 318 and second annular rib 319 by injection molding, the strength at the position between the tubular portions can be significantly improved, improving the overall strength of the filter head housing 30. The thickness (dimension in the axial direction of the filter head housing 30) of the first annular rib 318 and the second annular rib 319 is not particularly limited as long as the connection between each tubular portion and other joints is not hindered. In the embodiment shown in the figures, a first annular rib 318 is provided between the first and second sets of tubular portions, and a second annular rib 319 is provided between the second and third sets of tubular portions. However, the present invention is not limited thereto. In other examples according to the invention, a plurality of first annular ribs spaced apart from each other in the axial direction of the housing body 31 may be provided between the first group tubular portions and the second group tubular portions, and/or a plurality of second annular ribs spaced apart from each other in the axial direction of the housing body 31 may be provided between the second group tubular portions and the third group tubular portions, without interfering with the connection between the respective tubular portions and other joints.

In addition, in other embodiments according to the present invention, in addition to the above-described first annular rib 318 and second annular rib 319 provided between the respective sets of tubular portions, the rib on the outer peripheral wall of the housing body 31 of the filter head housing 30 may include an arc-shaped rib provided between the same sets of tubular portions that extends circumferentially along the outer peripheral wall of the housing body 31. For example, in one embodiment, on the outer peripheral wall of the housing body 31 of the filter head housing 30, an arc rib extending circumferentially between the first group of tubular portions (between the first tubular portion 311 and the fourth tubular portion 314) along the outer peripheral wall of the housing body 31 may be provided, both ends of the arc rib extending to adjacent tubular portions (the first tubular portion 311 and the fourth tubular portion 314) in the first group of tubular portions, respectively; an arc rib extending circumferentially along the outer peripheral wall of the housing body 31 between the second group of tubular portions (between the second tubular portion 312 and the fifth tubular portion 315) may be provided, both ends of which extend to adjacent tubular portions (the second tubular portion 312 and the fifth tubular portion 315) of the second group of tubular portions, respectively; and an arc rib extending circumferentially along the outer peripheral wall of the housing body 31 between the third group of tubular portions (between the third tubular portion 313 and the sixth tubular portion 316) may be provided, with both ends of the arc rib extending to adjacent tubular portions (the third tubular portion 313 and the sixth tubular portion 316) of the third group of tubular portions, respectively.

The valve body 40 is mounted in the filter head housing 30 so as to be rotatable with respect to the filter head housing 30 to a conducting position shown in fig. 4 or a closed position shown in fig. 5. Fig. 7 to 9 show perspective views of the valve body 40 from different angles, wherein the valve body 40 shown in fig. 7 corresponds to the position of the valve body 40 in fig. 4, fig. 8 shows a perspective view of the valve body 40 shown in fig. 7 after being rotated by an angle (for example, rotated by 90 degrees) in the direction of an arrow K1, the position of which corresponds to the position of the valve body 40 shown in fig. 5, and fig. 9 shows the top structure of the valve body 40 from another angle.

As shown in fig. 7 to 9, the valve body 40 includes a valve body 41 and a valve body flange 42. The circumferential wall of the valve body 41 is provided with a first group of through holes and a second group of through holes spaced apart from each other in the axial direction of the valve body 41. One or both of the first set of through holes and the second set of through holes may be provided with one or more through holes. Preferably, the number of through holes in the first and second sets of through holes of the valve body 41 is the same as the number of tubular portions in the first and second sets of tubular portions of the housing body 31, respectively. In the illustrated example, the first set of vias and the second set of vias each include two vias. The first group of through holes includes a first through hole 411 and a third through hole 413 spaced apart from each other in the circumferential direction of the valve body 41, the first through hole 411 and the third through hole 413 being located at substantially the same axial height; the second group of through holes includes a second through hole 412 and a fourth through hole 414 spaced apart from each other in the circumferential direction of the valve body 41, the second through hole 412 and the fourth through hole 414 being located at substantially the same axial height. The outer surface of the circumferential wall of the valve body 41 is also provided with annular grooves surrounding the respective through holes for mounting seals. Specifically, the outer surface of the circumferential wall of the valve body 41 is provided with a first annular groove 415 surrounding the first through hole 411, a second annular groove 416 surrounding the second through hole 412, a third annular groove 417 surrounding the third through hole 413, and a fourth annular groove 418 surrounding the fourth through hole 414.

The valve body 41 is provided with a lateral wall 43 at one axial end (axial upper end in fig. 7 and 8) of the valve body 41. An inner cylindrical portion 44 is formed at the central portion of the lateral wall 43. The inner cylindrical portion 44 extends through the lateral wall 43 in the axial direction and extends on both axial sides of the lateral wall 43, and includes a first inner cylindrical portion 441 located axially above the lateral wall 43 and a second inner cylindrical portion 442 located axially below the lateral wall 43 (not visible in fig. 7-9, shown in fig. 2, 11, and 13). The first inner cylinder 441 is provided with one opening or with a plurality of openings spaced apart from each other in the circumferential direction. In the illustrated example, the first inner cylindrical portion 441 is provided with a first opening 443 and a second opening 444 that are provided symmetrically to each other in the circumferential direction. In this example, the first inner cylinder 441 is a bottomed cylindrical portion, an end wall 445 is provided at an upper end portion of the first inner cylinder 441, and the first opening 443 and the second opening 444 may extend to the end wall 445 of the first inner cylinder 441. Alternatively, the first inner cylindrical portion 441 may be a cylindrical portion without a bottom, that is, without the end wall 445. The first inner barrel portion 441 is sized to mate with the size of the annular wall 33 of the filter head housing 30 such that when the valve body 40 is installed within the housing body 31, the annular wall 33 of the filter head housing 30 fits over the first inner barrel portion 441 of the valve body 40 and the valve body 40 is rotatable relative to the filter head housing 30 to selectively cause the first and second opening portions 443, 444 to be completely obscured by the first and second arcuate walls 331, 332, respectively, of the filter head housing 30 or to be aligned with the first and second notches 335, 336, respectively, of the filter head housing 30. The second inner barrel 442 is sized to mate with the second fluid outlet 113 of the cartridge 10. Referring back to fig. 1 and 2, the second fluid outlet 113 of the cartridge 10 is sealingly mounted within the second inner barrel 442 of the valve body 40. The upper surface of the transverse wall 43 is also provided with a limit groove 431, as best shown in fig. 9. The limiting groove 431 is an arc-shaped groove having an arc angle of about 90 degrees, and is located radially outside the inner cylindrical portion 44. The limit groove 431 is configured to receive a limit protrusion 333 on the first arc wall 331 of the filter head housing 30, the limit protrusion 333 of the filter head housing 30 moving within the limit groove 431 of the valve body 40 when the valve body 40 rotates relative to the filter head housing 30. In order to define the rotational range of the valve body 40 relative to the filter head housing 30, a first limit portion is provided on one of the valve body 40 and the filter head housing 30, and a second limit portion is provided on the other of the valve body 40 and the filter head housing 30, the first limit portion and the second limit portion collectively defining the rotational range of the valve body 40 relative to the filter head housing 30. In this example, the first stopper is a stopper protrusion 333 provided on the first arc wall 331, and the second stopper is a stopper groove 431 provided on the lateral wall 43 of the valve body 41.

The valve body flange 42 extends radially outward and axially from the other axial end portion (axially lower end portion in fig. 7 and 8) of the valve body 41, and an inner surface of a peripheral wall of the valve body flange 42 is located radially outward of the inner surface of the peripheral wall of the valve body 41, so that a valve body step 421 (shown in fig. 2, 11, 13) is formed between the inner surface of the peripheral wall of the valve body 41 and the inner surface of the peripheral wall of the valve body flange 42 in the inner cavity of the valve body 40. The valve body flange 42 mates with the filter head housing 30 and the filter head base 50, respectively. In addition, the inner surface of the peripheral wall of the valve body flange 42 is provided with a projection 422, as best shown in fig. 10. When the cartridge 10 is mounted to the filter head 20, the projection 422 is accommodated in the holding recess 115 of the cartridge 10 (the projection 422 and the holding recess 115 are shown in fig. 10 and 3, respectively), and is engaged with the holding recess 115, so that when the cartridge 10 is rotated, the valve body 40 can be rotated together by the holding recess 115 and the projection 422 engaged with each other.

The valve body 40 is further provided with a first circumferential groove G1, a second circumferential groove G2, and a third circumferential groove G3. A first circumferential groove G1 is provided on the outer surface of the peripheral wall of the valve body flange 42 for mounting the first seal S1. The second circumferential groove G2 is provided on the outer surface of the peripheral wall of the valve body 41, between the first group of through holes (first through hole 411, third through hole 413) and the second group of through holes (second through hole 412, fourth through hole 414) in the axial direction, for mounting the second seal S2. The third circumferential groove G3 is provided on the outer surface of the peripheral wall of the valve body 41, axially above the second group of through holes (the second through hole 412 and the fourth through hole 414), for mounting the third seal S3, and when the valve body 40 is mounted in the filter head housing 30, the third circumferential groove G3 and the third seal S3 are located axially below the third tubular portion 313 of the filter head housing 30 to isolate the third tubular portion 313 and the second tubular portion 312 from communication with each other.

The filter head base 50 is mounted to the filter head housing 30 and defines an axial position of the valve body 40 in conjunction with the filter head housing 30. The filter head base 50 includes a base body portion 51 and a plurality of positioning protrusions 52. A plurality of positioning projections 52 extend in the axial direction from one side surface (upper surface in fig. 4 and 5) of the base body portion 51, and are spaced apart from each other in the circumferential direction. As shown in fig. 10, the filter head base 50 is fixedly mounted to the filter head housing 30 by a plurality of fixing screws 54 such that the positioning projections 52 are mounted into the mounting holes 322 of the housing flange 32 of the filter head housing 30, and the upper surface of the base body portion 51 located radially inward of the positioning projections 52 abuts against the axial end surface of the housing flange 32 of the filter head housing 30 to restrain the valve body flange 42 of the valve body 40 between the base body portion 51 and the housing stepped portion 321 of the filter head housing 30, thereby maintaining the axial position of the valve body 40 such that the valve body 40 can be rotated relative to the filter head housing 30 and the filter head base 50, but cannot be moved in the axial direction relative to the filter head housing 30 and the filter head base 50. Further, the inner wall surface of the base body portion 51 of the filter head base 50 is provided with a plurality of holding portions 53 spaced apart from each other, as shown in fig. 10. In this example, the base body portion 51 is provided with two holding portions 53 spaced apart from each other. The upper surface of the holding portion 53 is provided as a spiral surface (the mounting portion 114 is shown in fig. 3) corresponding to the lower surface of the mounting portion 114 of the cartridge 10. When the cartridge 10 and the filter head 20 are mounted in place, the mounting portions 114 of the cartridge 10 rest on the respective holding portions 53, and the lower surfaces of the mounting portions 114 are engaged with the upper surfaces of the holding portions 53. In addition, as shown in fig. 4 and 5, a gasket 60 is interposed between the filter head base 50 and the filter head housing 30 to make the installation between the filter head base 50 and the filter head housing 30 more stable. The spacer 60 may be a metal spacer or other suitable spacer may be used.

Fig. 11 shows a cross-sectional view taken along section line A-A in fig. 4, showing the filter head housing 30, the valve body 40, and the filter head base 50 mounted to each other.

The valve body 40 is sealingly mounted in the inner cavity of the filter head housing 30 via the first, second and third seals S1, S2, S3 such that the first and third through-holes 411, 413 of the valve body 40 are located at axial heights generally corresponding to the first and fourth tubular portions 311, 314 of the filter head housing 30, respectively, the second and fourth through-holes 412, 414 of the valve body 40 are located at axial heights generally corresponding to the second and fifth tubular portions 312, 315 of the filter head housing 30, respectively, and the first and second opening portions 443, 444 of the first inner cylindrical portion 441 of the valve body 40 are located above the axial ends of the first and second arcuate walls 331, 332 of the filter head housing 30 such that the first and second opening portions 443, 444 can be selectively fully blocked by the first and second arcuate walls 331, 332 to interrupt fluid communication between the first and second opening portions 443, 444 and the third tubular portion 313 of the filter head housing 30; or selectively aligned with the first slot 335 and the second slot 336 of the filter head housing 30 to establish fluid communication between the first opening 443 and the second opening 444 and the third tubular portion 313 of the filter head housing 30 via the first slot 335 and the second slot 336. The first seal S1 is installed in the first circumferential groove G1 of the valve body 40 and contacts the inner surface of the circumferential wall of the filter head housing 30, preventing raw water flowing in through the first tubular portion 311 from leaking between the valve body 40 and the filter head housing 30. The second seal S2 is installed in the second circumferential groove G2 of the valve body 40 and contacts the inner surface of the circumferential wall of the filter head housing 30, preventing the first outflow fluid flowing out of the second and fourth through holes 412 and 414 of the valve body 40 from being mixed with the raw water flowing in from the first tubular portion 311. The third seal S3 is installed in the third circumferential groove G3 of the valve body 40 and contacts the inner surface of the circumferential wall of the filter head housing 30, preventing the second outflow fluid flowing out of the first and second opening portions 443 and 444 of the valve body 40 from being mixed with the first outflow fluid flowing out of the second and fourth through holes 412 and 414 of the valve body 40.

In addition, a corresponding seal is provided around each through hole of the valve body 40. Specifically, the seal S11 is installed in the first annular groove 415 surrounding the first through hole 411, the seal S21 is installed in the second annular groove 416 surrounding the second through hole 412, the seal S12 is installed in the third annular groove 417 surrounding the third through hole 413, and the seal S22 is installed in the fourth annular groove 418 surrounding the fourth through hole 414. The seals S11, S12 are in contact with the inner surface of the peripheral wall of the filter head housing 30 to prevent raw water flowing through the first through holes 411 and the third through holes 413 from leaking to the outer areas of the seals S11, S12. The seals S21, S22 contact the inner surface of the peripheral wall of the filter head housing 30 to prevent the first effluent fluid flowing through the second and fourth through holes 412, 414 from leaking to the outer regions of the seals S21, S22.

Fig. 11 shows the through holes of the valve body 40 in a conducting position in communication with the corresponding tubular portion of the filter head housing 30. As shown in fig. 11, when the valve body 40 is in the on position, the first through hole 411 of the valve body 40 is in aligned communication with the opening of the first tubular portion 311 of the filter head housing 30, the second through hole 412 of the valve body 40 is in aligned communication with the opening of the second tubular portion 312 of the filter head housing 30, and the first and second opening portions 443, 444 of the first inner cylinder portion 441 of the valve body 40 are not completely obscured by the first and second arcuate walls 331, 332 of the filter head housing 30, the first and second opening portions 443, 444 are thus in fluid communication with the third tubular portion 313 of the filter head housing 30.

Fig. 12 shows a cross-sectional view taken along section line C-C in fig. 11, showing the relative positions of the first and second arc walls 331, 332 of the annular wall 33 of the filter head housing 30 and the first and second opening portions 443, 444 of the valve body 40. As shown in fig. 12, the valve body 40 is positioned such that the first opening 443 is aligned with the first notch 335 between the first arc wall 331 and the second arc wall 332 of the filter head housing 30, the second opening 444 is aligned with the second notch 336 between the first arc wall 331 and the second arc wall 332 of the filter head housing 30, the first opening 443 and the second opening 444 are not completely obscured by the first arc wall 331 and the second arc wall 332, the first opening 443 and the second opening 444 are in communication with the radially outer cavity of the annular wall 33 of the filter head housing 30 and thus with the opening of the third tubular portion 313 such that the inner cavity of the inner cylindrical portion 44 of the valve body 40 is in fluid communication with the third tubular portion 313 and thereby such that the second fluid outlet 113 of the filter cartridge 10 located within the inner cylindrical portion 44 is in fluid communication with the third tubular portion 313, i.e., the second fluid outlet 113 of the filter cartridge 10 is in fluid communication with the second water outlet port P3 of the filter 1 (as shown in fig. 2).

Fig. 13 shows a cross-sectional view taken along section line B-B in fig. 5, showing the through holes of the valve body 40 in a closed position in non-communication with the tubular portions of the filter head housing 30.

As shown in fig. 13, when the valve body 40 is in the closed position, the first through hole 411 of the valve body 40 faces the inner surface of the peripheral wall of the filter head housing 30, is not aligned with the first tubular portion 311, and a seal S11 (not shown in fig. 13) provided in a first annular groove 415 surrounding the first through hole 411 is in contact with the inner surface of the peripheral wall of the filter head housing 30, so that the first through hole 411 is not in fluid communication with the first tubular portion 311. Similarly, the third through-bore 413 is also not in fluid communication with the first tubular portion 311. And the first seal S1 is provided between the valve body 40 and the filter head housing 30, even if the raw water line connected to the raw water port P1 is not closed, the raw water flowing into the first tubular portion 311 through the raw water port P1 does not flow into the valve body 40 or leak from between the valve body 40 and the filter head housing 30.

Similarly, the second through-hole 412, the fourth through-hole 414 (not shown in fig. 13), and the seal S21 disposed in the second annular groove 416 surrounding the second through-hole 412 and the seal S22 disposed in the fourth annular groove 418 surrounding the fourth through-hole 414 are each facing the inner surface of the peripheral wall of the filter head housing 30, and neither the second through-hole 412 nor the fourth through-hole 414 is in fluid communication with the second tubular portion 312. Therefore, even if the first water outlet line connected to the first water outlet port P2 is not closed, the first outflow fluid in the second tubular portion 312 does not flow back into the valve body 40.

Fig. 14 shows a cross-sectional view taken along section line D-D in fig. 13. As shown in fig. 14, when the valve body 40 is in the closed position, the first and second opening portions 443, 444 of the first inner cylindrical portion 441 are completely shielded by the first and second arc walls 331, 332 of the filter head housing 30, respectively, the first and second arc walls 331, 332 are in sealing engagement with the first inner cylindrical portion 441, neither the first nor second opening portions 443, 444 are in fluid communication with the third tubular portion 313, and therefore the inner cavity of the inner cylindrical portion 44 is not in fluid communication with the third tubular portion 313. Therefore, even if the second water outlet line connected to the second water outlet port P3 is not closed, the second outflow fluid in the third tubular portion 313 does not flow back into the valve body 40.

In addition, since the first seal S1, the second seal S2, and the third seal S3 are provided between the valve body 40 and the filter head housing 30, raw water flowing through the first tubular portion 311, first outflow fluid flowing through the second tubular portion 312, and second outflow fluid flowing through the third tubular portion 313 can be prevented from being mixed with each other.

In the illustrated example, the first inner cylindrical portion 441 of the valve body 40 is provided with a first opening 443 and a second opening 444 that are disposed symmetrically in the circumferential direction, and the annular wall 33 of the filter head housing 30 is provided with a first notch 335 and a second notch 336 that are spaced apart from each other. However, the present invention is not limited thereto, and in other examples according to the present invention, the first inner cylinder portion 441 of the valve body 40 may be provided with only one opening portion, such as the first opening portion 443, and accordingly, the axial end portion of the annular wall 33 of the filter head housing may be provided with only one notch, such as the first notch 335.

The main structure of the filter head 20 and the filter 1 having the filter head 20 is described above. The process of attachment and detachment between the filter cartridge 10 and the filter head 20 of the filter 1 will be described below with reference to the accompanying drawings.

Referring to fig. 3 and 10, when the cartridge 10 and the filter head 20 are mounted in place, the mounting portion 114 of the cartridge 10 is restrained between the holding portion 53 of the filter head base 50 and the valve body step 421 of the valve body 40, the mounting portion 114 rests on the holding portion 53 of the filter head base 50 of the filter head 20, and the holding recess 115 of the cartridge 10 and the projection 422 of the filter head 20 are engaged with each other. Referring back to fig. 1 and 2, when the cartridge 10 and filter head 20 are installed in place, the two fluid inlets 111 of the cartridge 10 are aligned with and in communication with the first through-hole 411 and the third through-hole 413, respectively, of the valve body 40 of the filter head 20, the first fluid outlet 112 of the cartridge 10 is in communication with the second through-hole 412 and the fourth through-hole 414 of the valve body 40, the second fluid outlet 113 of the cartridge 10 is sealingly installed in the second inner cylindrical portion 442 of the inner cylindrical portion 44 of the valve body 40, and the valve body 40 of the filter head 20 is in the conductive position shown in fig. 11 with respect to the filter head housing 30. Thus, the raw water port P1 is in fluid communication with the fluid inlet 111 of the filter cartridge 10, the first water outlet port P2 is in fluid communication with the first fluid outlet 112 of the filter cartridge 10, and the second water outlet port P3 is in fluid communication with the second fluid outlet 113 of the filter cartridge 10. Raw water flows into the filter 1 from the raw water port P1, flows into the raw water channel L1 of the filter cartridge 10 through the first through hole 411 of the valve body 40 and the fluid inlet 111 of the filter cartridge 10, and is treated by the filter medium 12 of the filter cartridge 10 to obtain a first outflow fluid and a second outflow fluid. The first outlet fluid flows into the first outlet channel L2 of the cartridge 10, out of the cartridge from the first fluid outlet 112, through the second through-hole 412 of the valve body 40, and out of the filter 1 from the first outlet port P2. The second outflow fluid flows into the second outflow channel L3 of the cartridge 10, flows out of the cartridge 10 from the second fluid outlet 113, flows into the inner cylindrical portion 44 of the valve body 40, flows out of the valve body 40 through the first opening 443 and the second opening 444 (see fig. 11), flows into the third tubular portion 313, and flows out of the filter 1 through the second outlet port P3.

When the cartridge 10 of the filter 1 needs to be replaced, the operator rotates the cartridge 10 in the removal direction. Since the holding recess 115 of the cartridge 10 and the projection 422 on the valve body 40 of the filter head 20 are engaged with each other, rotation of the cartridge 10 rotates the valve body 40 relative to the cartridge housing 30. When the cartridge 10 and the valve body 40 are rotated together such that the valve body 40 is in the closed position shown in fig. 13, the fluid communication with the inside of the valve body 40 is cut off from the raw water port P1, the first water outlet port P2, and the second water outlet port P3. Even if the pipes connected to these ports are not closed, the fluid in the pipes does not flow into the valve body 40. And at this time, the mounting portion 114 of the cartridge 10 no longer rests on the retaining portion 53 of the filter head base 50. Accordingly, the cartridge 10 can be pulled down to disengage the retaining recess 115 of the cartridge 10 from the projection 422 of the valve body 40, thereby removing the cartridge 10 from the filter head 20.

When a new filter cartridge 10 is mounted to the filter head 20, the retaining recess 115 of the new filter cartridge 10 is aligned with the projection 422 of the valve body 40, the filter cartridge 10 is pushed upward so that the projection 422 of the valve body 40 engages with the retaining recess 115 of the filter cartridge 10, and then the filter cartridge 10 is rotated in the mounting direction opposite to the dismounting direction, and the valve body 40 of the filter head 20 is rotated together by the retaining recess 115 and the projection 422 contacting each other, the spiral lower surface of the mounting portion 114 of the filter cartridge 10 is spirally raised along the spiral upper surface of the retaining portion 53 of the filter head base 50. When the cartridge 10 and the valve body 40 are rotated together such that the mounting portion 114 of the cartridge 10 is restrained from further rotation between the valve body step 421 and the retaining portion 53 of the valve body 40, the mounting portion 114 of the cartridge 10 rests on the retaining portion 53 of the filter head base 50 and the valve body 40 is in the on position shown in fig. 11, at which time a new cartridge 10 and filter head 20 have been installed in place as shown in fig. 1 and 2.

The filter head 20 according to the first embodiment of the present invention and the filter 1 having the filter head 20 are described above. The attachment and detachment operation between the filter head 20 and the filter cartridge 10 according to the first embodiment of the present invention is convenient, the fluid lines connected to the ports of the filter do not need to be previously closed during the attachment and detachment, and the mixing between the fluids can be effectively prevented.

In the above preferred embodiment, one tubular portion of each of the first, second, and third sets of tubular portions of the filter head housing 30 is in fluid communication with the inner cavity of the housing body 31 to form the raw water port P1, the first water outlet port P2, and the second water outlet port P3 aligned in the axial direction, while the remaining tubular portions are not in fluid communication with the inner cavity of the housing body 31. However, the present invention is not limited thereto, and in other modified examples according to the present invention, either one or two of each of the first, second, and third sets of tubular portions may be brought into fluid communication with the inner cavity of the housing body 31 according to the specific application of the filter 1. In addition, in the above preferred embodiment, each of the first, second, and third sets of tubular portions of the filter head housing 30 is provided with two tubular portions. However, the present invention is not limited thereto, and in other examples according to the present invention, one or more of the first, second, and third sets of tubular portions may be provided with fewer or more tubular portions, such as one tubular portion or three tubular portions.

Fig. 15 shows a filter head 20A according to a first modified example of the present invention. The filter head 20A according to the first modified example of the invention has substantially the same configuration as the filter head 20 according to the first embodiment of the invention, except for the configuration of the filter head housing 30A of the filter head 20A. Accordingly, in the drawings and the following, the same components are denoted by the same reference numerals, and the corresponding descriptions are omitted. The following will mainly explain the differences therebetween.

Filter head 20A includes a filter head housing 30A, a valve body 40, and a filter head base 50. The valve body 40 and the filter head base 50 of the filter head 20A are identical to the valve body 40 and the filter head base 50 of the filter head 20 described above. The filter head housing 30A of the filter head 20A differs from the filter head housing 30 of the filter head 20 only in that none of the first tubular portion 311A, the second tubular portion 312A, and the third tubular portion 313A of the filter head housing 30A is in communication with the interior cavity of the filter head housing 30A, while none of the fourth tubular portion 314A, the fifth tubular portion 315A, and the sixth tubular portion 316A is in communication with the interior cavity of the filter head housing 30A, and is therefore capable of being in fluid communication with a fluid inlet, a first fluid outlet, and a second fluid outlet, respectively, of a filter cartridge mounted to the filter head 20A. The fourth tubular portion 314A forms a raw water port P1, the fifth tubular portion 315A forms a first water outlet port P2, and the sixth tubular portion 316A forms a second water outlet port P3.

The filter head 20A and the filter having the filter head 20A according to the first modified example of the invention can achieve the same advantageous technical effects as the filter head 20 and the filter 1 according to the first embodiment of the invention. In one example, the filter with the filter head 20A mounted thereto may also be formed by rotating the filter head 20 of the filter 1 shown in fig. 1 by 180 degrees relative to the filter cartridge.

Fig. 16 shows a filter head 20B according to a second modified example of the present invention. The filter head 20B according to the second modified example of the invention has substantially the same configuration as the filter head 20 according to the first embodiment of the invention, except for the configuration of the filter head housing 30B of the filter head 20B.

The filter head housing 30B of the filter head 20B differs from the filter head housing 30 of the filter head 20 only in that all tubular portions of the filter head housing 30B communicate with the inner cavity of the filter head housing 30B. And thus the first tubular portion 311B and the fourth tubular portion 314B of the filter head housing 30B may each be in communication with the fluid inlet 111 of a filter cartridge mounted to the filter head 20B, the second tubular portion 312B and the fifth tubular portion 315B may each be in communication with the first fluid outlet 112 of the filter cartridge, and the third tubular portion 313B and the sixth tubular portion 316B may each be in fluid communication with the second fluid outlet 113 of the filter cartridge. The filter head 20B may be applied to a filter unit composed of a plurality of filters. When applied to a filter unit, one of the first tubular portion 311B and the fourth tubular portion 314B of the filter head 20B may serve as a raw water port of a filter to which the filter head 20B is mounted, one of the second tubular portion 312B and the fifth tubular portion 315B of the filter head 20B may serve as a first water outlet port of the filter, and one of the third tubular portion 313B and the sixth tubular portion 316B of the filter head 20B may serve as a second water outlet port of the filter. The other of the first tubular portion 311B and the fourth tubular portion 314B, the other of the second tubular portion 312B and the fifth tubular portion 315B, and the other of the third tubular portion 313B and the sixth tubular portion 316B of the filter head 20B may then serve as connection ports for the filter to other filters in the filter assembly.

The filter head 20B and the filter having the filter head 20B according to the second modified example of the present invention can achieve the same advantageous technical effects as the filter head 20 and the filter 1 according to the first embodiment of the present invention, and can achieve convenient disassembly and installation of the filter element.

The filter head 20, the filter head 20A, and the filter head 20B according to the present invention may be mounted on the filter cartridge 10, respectively, to form a single-use filter. In the above example, the cartridge 10 is a reverse osmosis membrane cartridge. However, the present invention is not limited thereto, and in other examples according to the present invention, the filter head 20A, and the filter head 20B may be mounted on other types of filter cartridges, respectively. In addition, filter head 20A, and filter head 20B may also be used in a filter assembly that includes a plurality of filter elements, each mounted to a respective filter element of the filter assembly.

Fig. 17 shows an example of a filter assembly comprising a filter head according to the invention. As shown in fig. 17, the filter assembly 100 includes a first filter and a second filter that are in fluid communication with each other via a first connection 70.

The first filter includes the first filter element 10A and the filter head 20 described above, and the filter head 20 is mounted on the first filter element 10A. The first filter cartridge 10A is a prefilter composite filter cartridge. The housing of the first cartridge 10A is identical to the housing 11 of the cartridge 10 described previously. Fig. 18 shows a partial cross-sectional view of the first cartridge 10A, showing the filter media and the various fluid passages within the housing of the first cartridge 10A. The first filter cartridge 10A includes a first filter medium 12A, a second filter medium 12B, and a third filter medium 12C. The first cartridge 10A has one fluid inlet or a plurality of fluid inlets 111A spaced apart from one another and has a first fluid outlet 112A and a second fluid outlet 113A. Raw water enters the raw water channel L1A of the first filter element 10A from the fluid inlet 111A, is filtered by the first filter medium 12A and the second filter medium 12B, is filtered by the third filter medium 12C, enters the first outflow channel L2A, and flows out of the filter element 10A from the first fluid outlet 112A. Alternatively, the raw water flows into the second outflow path L3A of the filter cartridge 10A after being filtered by the first filter medium 12A and the second filter medium 12B, and flows out of the filter cartridge 10A from the second fluid outlet 113A without flowing through the third filter medium 12C.

As shown in fig. 17, the filter head 20 is mounted to the first filter cartridge 10A such that the fluid inlet 111A of the first filter cartridge 10A communicates with the raw water port (i.e., the first tubular portion 311) of the filter head 20, the first fluid outlet 112A of the first filter cartridge 10A communicates with the first water outlet port (i.e., the second tubular portion 312) of the filter head 20, and the second fluid outlet 113A of the first filter cartridge 10A is sealingly mounted within the inner cylindrical portion 44 of the filter head 20 to communicate with the second water outlet port (i.e., the third tubular portion 313) of the filter head 20.

The second filter includes a second filter cartridge 10B and the filter head 20A described above. The second cartridge 10B is a reverse osmosis membrane cartridge and is identical to the cartridge 10 described above. The filter head 20A is mounted on the second filter cartridge 10B, the fluid inlet of the second filter cartridge 10B communicates with the raw water port (i.e., the fourth tubular portion 314A) of the filter head 20A, the first fluid outlet of the second filter cartridge 10B communicates with the first water outlet port (i.e., the fifth tubular portion 315A) of the filter head 20A, and the second fluid outlet of the second filter cartridge 10B communicates with the second water outlet port (i.e., the sixth tubular portion 316A) of the filter head 20A.

The first connector 70 fluidly connects the first filter to the second filter. Specifically, as shown in fig. 17, the first connection member 70 is connected between the filter head 20 and the filter head 20A. The first connector 70 has disposed therein a first fluid passage 71, a second fluid passage 72, a third fluid passage 73, a fourth fluid passage 74, and a fifth fluid passage 75. One ends of the first, second, and third fluid passages 71, 72, and 73 are connected to the first, second, and third tubular portions 311, 312, and 313 of the filter head 20, respectively. The other end of the first fluid passage 71 is a water inlet 711 of the filter unit 100, which is connected to the raw water line. Raw water may flow into the first fluid passage 71 from the water inlet 711 and flow into the first filter through the first tubular portion 311 to be filtered, as shown by arrow-headed line F1 in fig. 17. The other end of the second fluid passage 72 is connected to the raw water port (i.e., the fourth tubular portion 314A) of the filter head 20A. The filtered fluid filtered by the first filter medium 12A, the second filter medium 12B, and the third filter medium 12C of the first filter flows into the second filter as raw water of the second filter to be further filtered, as indicated by an arrow-headed line F2 in fig. 17. The other end of the third fluid passage 73 is a first water outlet 732 of the filter assembly 100. The filtered fluid (first outgoing fluid) filtered through the first filter medium 12A and the second filter medium 12B of the first filter flows from the third tubular portion 313 of the filter head 20 into the third fluid passage 73 of the first connector 70 and may flow out of the first water outlet 732 for use, as indicated by the arrowed line F3 in fig. 17. One ends of the fourth fluid passage 74 and the fifth fluid passage 75 are connected to the fifth tubular portion 315A and the sixth tubular portion 316A of the filter head 20A, respectively. The other ends of the fourth fluid passage 74 and the fifth fluid passage 75 are the second water outlet 742 and the third water outlet 752 of the filter unit 100, respectively. The filtered fluid filtered by the first filter medium 12A, the second filter medium 12B, and the third filter medium 12C of the first filter flows into the second filter, and the pure water (second outflow fluid) obtained by the treatment of the filter cartridge 10B flows into the fourth fluid passage 74 of the first connector 70 from the fifth tubular portion 315A of the filter head 20A, and flows out of the second water outlet 742 for use, as indicated by an arrow-headed line F4 in fig. 17. The concentrated water (third outflow fluid) treated by the cartridge 10B of the second filter flows from the sixth tubular portion 316A of the filter head 20A into the fifth fluid passage 75 of the first connector 70 and out of the third water outlet 752, as indicated by the arrowed line F5 in fig. 17.

Three outflow fluids can be obtained after the filter unit 100 filters the raw water, and flow out of the filter unit 100 through the first water outlet 732, the second water outlet 742 and the third water outlet 752, respectively.

Fig. 19 shows another example of a filter assembly comprising a filter head according to the invention, fig. 20 shows a partial enlargement of fig. 19. As shown in fig. 19 and 20, the filter unit 200 includes a first filter, a second filter, and a third filter, and a connection member fluidly connecting the filters to each other. The first filter of the filter assembly 200 is in fluid communication with each other via the first connection 70 and the second filter, and the third filter is in fluid communication with each other via the second connection 80 and the second filter and the first filter. The first filter of the filter assembly 200 is identical to the first filter of the filter assembly 100, and the first connector 70 of the filter assembly 200 is identical to the first connector of the filter assembly 100. The filter assembly 200 differs from the filter assembly 100 in that the filter assembly 200 further includes a third filter and a fluid connection between the third filter and the other filters. Only the differences between the filter unit 200 and the filter unit 100 will be described below.

The second filter of the filter assembly 200 includes a second filter cartridge 10B and the filter head 20B described above. The second cartridge 10B of the filter assembly 200 is identical to the cartridge 10 described above for the second cartridge of the filter assembly 100. The filter head 20B is mounted on the second filter cartridge 10B, the fluid inlet of the second filter cartridge 10B communicates with the raw water port of the filter head 20B (i.e., one of the first tubular portion 311B and the fourth tubular portion 314B of the filter head 20B), the first fluid outlet of the second filter cartridge 10B communicates with the first water outlet port of the filter head 20B (i.e., one of the second tubular portion 312B and the fifth tubular portion 315B of the filter head 20B), and the second fluid outlet of the second filter cartridge 10B communicates with the second water outlet port of the filter head 20B (i.e., one of the third tubular portion 313B and the sixth tubular portion 316B of the filter head 20B). In the example shown in the figures, the raw water port of the filter head 20B is a fourth tubular portion 314B, and one end of the second fluid passage 72 connected to the first connection member 70 is in fluid communication with the first water outlet port of the filter head 20 of the first filter (i.e., the second tubular portion 312 of the filter head 20), such that the filtered fluid filtered through the first filter medium 12A, the second filter medium 12B, and the third filter medium 12C of the first filter is raw water of the second filter cartridge 10B. The first outlet port of the filter head 20B is a fifth tubular portion 315B, and is connected to one end of the fourth fluid passage 74 of the first connector 70 to be in fluid communication with the second outlet port 742 of the filter assembly 200, such that pure water obtained after further treatment by the second filter cartridge 10B flows out of the second outlet port 742 of the filter assembly 200 as a second outflow fluid. The second outlet port of the filter head 20B is a sixth tubular portion 316B, and is connected to one end of the fifth fluid channel 75 of the first connector 70 to be in fluid communication with the third outlet port 752 of the filter assembly 200, such that the concentrated water obtained after further treatment by the second filter cartridge 10B flows out of the third outlet port 752 of the filter assembly 200 as a third outflow fluid. The first tubular portion 311B, the second tubular portion 312B, and the third tubular portion 313B of the filter head 20B are connection ports between the filter head 20B and the third filter.

The third filter of the filter unit 200 includes the third filter element 10C and the filter head 20A described above. The third cartridge 10C of the filter assembly 200 is identical to the second cartridge 10B. The filter head 20A is mounted on the third filter cartridge 10C, the fluid inlet of the third filter cartridge 10C communicates with the raw water port of the filter head 20A (i.e., the fourth tubular portion 314A of the filter head 20A), the first fluid outlet of the third filter cartridge 10C communicates with the first water outlet port of the filter head 20A (i.e., the fifth tubular portion 315A of the filter head 20A), and the second fluid outlet of the third filter cartridge 10C communicates with the second water outlet port of the filter head 20A (i.e., the sixth tubular portion 316A of the filter head 20A). The third filter is in fluid communication with the second filter and the first filter via a second connection 80.

The second connector 80 is configured to fluidly connect the filter head 20A of the third filter with the filter head 20B of the second filter such that the filter head 20A of the third filter may be in fluid communication with the first connector 70 and the first filter. The second connection 80 is provided with a first fluid channel 81, a second fluid channel 82 and a third fluid channel 83. As shown in fig. 20, one end of the first fluid passage 81 is connected to the first tubular portion 311B of the filter head 20B of the second filter, and the other end of the first fluid passage 81 is connected to the fourth tubular portion 314A of the filter head 20A of the third filter. One end of the second fluid passage 82 is connected to the second tubular portion 312B of the filter head 20B of the second filter, and the other end of the second fluid passage 82 is connected to the fifth tubular portion 315A of the filter head 20A of the third filter. One end of the third fluid passage 83 is connected to the third tubular portion 313B of the filter head 20B of the second filter, and the other end of the third fluid passage 83 is connected to the sixth tubular portion 316A of the filter head 20A of the third filter.

The filtered fluid filtered through the first filter medium 12A, the second filter medium 12B, and the third filter medium 12C of the first filter flows into the fourth tubular portion 314B of the filter head 20B of the second filter through the second fluid passage 72 of the first connector 70, and enters the inner cavity of the valve body 40 through the third through-hole 413 of the valve body 40 of the filter head 20B. A portion of the filtered fluid entering the interior cavity of the valve body 40 of the filter head 20B flows into the second filter cartridge 10B through the fluid inlet of the second filter cartridge 10B for further filtration through the second filter cartridge 10B, and another portion flows into the first tubular portion 311B of the filter head 20B through the first through-hole 411 of the valve body 40 of the filter head 20B, further into the first fluid passage 81 of the second connector 80, and flows into the third filter through the fourth tubular portion 314A of the filter head 20A for further filtration through the third filter cartridge 10C. Therefore, the filtered fluid filtered by the first filter medium 12A, the second filter medium 12B, and the third filter medium 12C of the first filter is raw water of the second filter and the third filter.

Pure water treated by the second filter cartridge 10B of the second filter flows as a second outflow fluid from the fifth tubular portion 315B of the filter head 20B into the fourth fluid passage 74 of the first connector 70 and out of the second water outlet 742 of the filter assembly 200. The concentrated water treated by the second filter cartridge 10B of the second filter flows as a third outflow fluid from the sixth tubular portion 316B of the filter head 20B into the fifth fluid passage 75 of the first connector 70 and out the third water outlet 752 of the filter unit 200.

Pure water obtained by treating raw water flowing from the fourth tubular portion 314A of the filter head 20A into the third filter through the third filter cartridge 10C of the third filter flows from the fifth tubular portion 315A of the filter head 20A into the valve body 40 of the filter head 20B through the second fluid passage 82 of the second connector 80, the second tubular portion 312B of the filter head 20B, and the second through hole 412 of the valve body 40 of the filter head 20B, flows into the fourth fluid passage 74 of the first connector 70 through the fourth through hole 414 of the valve body 40 of the filter head 20B, and the fifth tubular portion 315B, and flows out from the second water outlet 742 of the filter unit 200. The concentrated water treated by the third filter element 10C of the third filter flows from the sixth tubular portion 316A of the filter head 20A into the housing body 31 of the filter head 20B through the third fluid passage 83 of the second connector 80 and the third tubular portion 313B of the filter head 20B, flows into the fifth fluid passage 75 of the first connector 70 through the sixth tubular portion 316B of the filter head 20B, and flows out of the third water outlet 752 of the filter unit 200.

Therefore, the pure water treated by the second filter element 10B of the second filter and the pure water treated by the third filter element 10C of the third filter are the second outflow fluid of the filter unit 200, and flow out from the second water outlet 742; the concentrated water treated by the second filter element 10B of the second filter and the concentrated water treated by the third filter element 10C of the third filter are the third outflow fluid of the filter unit 200, and flow out from the third water outlet 752.

In the illustrated filter assembly 200, the second filter cartridge 10B and the third filter cartridge 10C are identical filter cartridges, and the second filter and the third filter are connected in parallel. However, the present invention is not limited thereto, and in other examples of the filter unit according to the present invention, the second filter and the third filter may be connected in series. For example, in one example, the second tubular portion 312B of the filter head 20B of the second filter may be connected to the raw water port of the third filter such that the fluid resulting from treatment by the second filter may be further treated by the third filter and, correspondingly, the fifth tubular portion 315A and the sixth tubular portion 316A of the third filter may be fluidly connected to additional water outlets of the filter assembly to provide further different degrees of filtration of the outgoing fluid, providing further options.

The filter head, filter and filter assembly according to the preferred embodiments of the invention are shown above in the application of the invention in municipal tap water filtration. However, the present invention is not limited to the above-described preferred embodiments. Modifications can be made on the basis of the above-described preferred embodiments according to the inventive concept, which modifications are also included in the scope of the present invention.

In the above preferred example of the filter head, the first inner cylinder portion 441 has the ceiling wall 445, the first opening 443 and the second opening 444 are provided on the peripheral wall and the ceiling wall of the first inner cylinder portion 441, and the annular wall 33 of the filter head case 30 is sealingly engaged with the first inner cylinder portion 441 of the valve body 40 without providing a seal therebetween. However, the present invention is not limited thereto, and in other examples according to the present invention, the first inner cylinder 441 may not have the ceiling wall 445, and an opening may be provided on the peripheral wall of the first inner cylinder, and a seal may be provided around the opening on the peripheral wall of the first inner cylinder, as the installation space permits, to provide a better seal.

In the filter head of the above preferred example, the raw water port P1, the first water outlet port P2, and the second water outlet port P3 are all located on the same side, and are provided by the tubular portion on the same side. However, the present invention is not limited thereto, and in other examples according to the present invention, one of the raw water port P1, the first water outlet port P2, and the second water outlet port P3 may be provided to be located on a different side from the other ports as needed. For example, in one example, the raw water port P1 is provided by the first tubular portion 311, and the first and second water outlet ports P2 and P3 may be provided by the fifth and sixth tubular portions 315 and 316, respectively, for which the first, fifth and sixth tubular portions 311, 315 and 316 communicate with the inner cavity of the filter head housing 30.

In the above preferred example filter, the filter head is applied to a filter cartridge having two fluid outlets. However, the invention is not limited thereto, and the filter head according to the invention may also be applied to a filter cartridge having one fluid outlet. In this application, the fluid outlet of the filter cartridge may be mounted in communication with either of the first and second outlet ports of the filter head.

In the above preferred example of the filter unit, the water inlet 711, the first water outlet 732, the second water outlet 742, and the third water outlet 752 of the filter unit are all provided on the first connector 70. However, the present invention is not limited thereto. In other examples according to the invention, other arrangements of the water inlet 711, the first water outlet 732, the second water outlet 742 and the third water outlet 752 of the filter unit may be used. For example, in a modified example of the filter unit shown in fig. 17 and the filter unit shown in fig. 19, the second tubular portion 312A and the third tubular portion 313A of the filter head 20A may be provided in communication with the inner cavity of the filter head housing and provided as the second water outlet and the third water outlet of the filter unit, respectively, and in this modified example, the fifth tubular portion 315A and the sixth tubular portion 316A of the filter head 20A may be provided not in communication with the inner cavity of the filter head housing. In another modified example of the filter unit shown in fig. 19, the second water outlet and the third water outlet of the filter unit may be provided on the second connection member 80, and accordingly, the fifth tubular portion 315B and the sixth tubular portion 316B of the filter head 20B of the second filter may be provided so as not to communicate with the inner cavity of the filter head housing of the filter head 20B.

In the above preferred example filter unit 200, the filter head of the third filter is connected to the filter head 20B of the second filter via the second connection member 80, and the filtered fluid flowing out of the first water outlet port of the first filter flows into the raw water port of the filter head 21A of the third filter via the filter head 20B of the second filter. However, the present invention is not limited thereto, and in other examples according to the present invention, the fifth tubular portion 315 of the filter head 20 of the first filter may be disposed to communicate with the inner cavity of the filter head housing of the filter head 20, and the raw water port of the filter head 20A of the third filter may be connected to the fifth tubular portion 315 of the filter head 20 of the first filter, and in this modified example, the first tubular portion 311B of the filter head 20B of the second filter may be disposed not to communicate with the inner cavity of the filter head housing.

In the above preferred example filter assembly, the filter heads of the filter assembly communicate with each other via the fluid passages within the first and second connectors 70, 80. However, the present invention is not limited thereto, and in other examples according to the present invention, the filter heads of the filter group may be respectively communicated with each other via the corresponding fluid pipes. In addition, the filter assembly according to the invention may be provided with more filters as desired, for example, four filters may be provided.

Exemplary embodiments of the present invention have been described in detail herein in connection with filter heads, filters having such filter heads, and filter assemblies in accordance with the present invention for use in the filtration of potable water, but it should be understood that the invention is not limited to the specific embodiments described and illustrated in detail above. Those skilled in the art will be able to make various modifications and variations to the invention without departing from the spirit and scope of the invention. All such modifications and variations are intended to be within the scope of the present invention. Moreover, all the components described herein may be replaced by other technically equivalent elements.

Claims

1. A filter head (20, 20a,20 b) comprising:

a filter head housing (30, 30a,30 b), the filter head housing (30, 30a,30 b) comprising a hollow housing body (31, 31a,31 b);

a valve body (40), the valve body (40) being mounted in an inner cavity of the housing body (31, 31a,31 b), the valve body (40) comprising a hollow valve body (41), the inner cavity of the valve body (41) being to accommodate a fluid inlet (111) and a fluid outlet of the filter cartridge (10); and

a filter head base (50), the filter head base (50) being mounted to the filter head housing (30, 30a,30 b) to confine the valve body (40) within the filter head housing (30, 30a,30 b),

It is characterized in that the method comprises the steps of,

the housing body (31, 31a,31 b) is provided with a raw water port (P1), a first water outlet port (P2) and a second water outlet port (P3) which are communicated with the inner cavity of the housing body (31, 31a,31 b); and is also provided with

The valve body (40) is configured to be rotatable relative to the filter head housing (30, 30a,30 b) to a conducting position in which an interior cavity of the valve body (41) is in fluid communication with the raw water port (P1), the first water outlet port (P2) and the second water outlet port (P3), or a closed position in which an interior cavity of the valve body (41) is not in fluid communication with the raw water port (P1), the first water outlet port (P2) and the second water outlet port (P3),

wherein the peripheral wall of the valve body (41) is provided with a first group of through holes and a second group of through holes spaced apart from each other in the axial direction of the valve body (40), the lateral wall (43) of the valve body (41) is provided with an inner cylindrical portion (44), the inner cylindrical portion (44) extends through the lateral wall (43) in the axial direction and has a first inner cylindrical portion (441) located axially above the lateral wall (43), the first inner cylindrical portion (441) is provided with an opening portion,

wherein the housing body (31, 31A, 31B) is further provided with an annular wall (33) extending in the inner cavity of the housing body (31, 31A, 31B) in the axial direction from a top wall (317) of the housing body (31, 31A, 31B), an axial end of the annular wall (33) is provided with a notch, the annular wall (33) is in sealing engagement with the first inner cylinder (441),

In the on position, one of the first set of through holes is in fluid communication with the raw water port (P1), one of the second set of through holes is in fluid communication with the first water outlet port (P2), and the opening is in fluid communication with the second water outlet port (P3), the opening

Is in fluid communication with the second outlet port (P3) via the slot,

in the closed position, none of the first set of through holes is in fluid communication with the raw water port (P1), none of the second set of through holes is in fluid communication with the first water outlet port (P2), and the opening is not in fluid communication with the second water outlet port (P3), the opening being completely obscured by the annular wall (33).

2. The filter head (20, 20a,20 b) according to claim 1, wherein one of the housing body (31, 31a,31 b) and the valve body (41) is provided with a first limit portion and the other of the housing body (31, 31a,31 b) and the valve body (41) is provided with a second limit portion, the first limit portion and the second limit portion together defining a range of rotation of the valve body (40) relative to the filter head housing (30, 30a,30 b).

3. The filter head (20, 20a,20 b) of claim 2, wherein,

The opening portion includes a first opening portion (443) and a second opening portion (444) that are circumferentially spaced apart;

the slots include first and second slots (335, 336) spaced apart circumferentially such that axial ends of the annular wall (33) are formed with first and second arcuate walls (331, 332) spaced apart circumferentially from each other;

in the on position, the first opening (443) and the second opening (444) are in fluid communication with the second water outlet port (P3) via the first slot (335) and the second slot (336), respectively;

in the closed position, the first opening (443) and the second opening (444) are completely blocked by the first arc wall (331) and the second arc wall (332), respectively.

4. A filter head (20, 20a,20 b) according to claim 3, wherein the first stop is a stop protrusion (333) provided on an axial end of the first arc-shaped wall (331), and the second stop is a stop groove (431) provided on the lateral wall (43) of the valve body (41).

5. The filter head (20, 20a,20 b) of claim 1, wherein the valve body

Annular first sealing members (S1), second sealing members (S2) and third sealing members (S3) are arranged between the peripheral wall of the body (41) and the peripheral wall of the housing body (31, 31A, 31B), the first sealing members (S1) are located below the first group of through holes in the axial direction, the second sealing members (S2) are located between the first group of through holes and the second group of through holes, and the third sealing members (S3) are arranged above the second group of through holes in the axial direction and below the second water outlet port (P3) in the axial direction.

6. The filter head (20, 20a,20 b) of claim 1, wherein an annular seal is provided around each of the first and second sets of through holes.

7. The filter head (20, 20a,20 b) of claim 1, wherein the filter head housing (30, 30a,30 b) further comprises a housing flange (32, 32a,32 b), the housing flange (32, 32a,32 b) being located radially outward of the housing body (31, 31a,31 b) and a housing step (321) being formed between the housing body (31, 31a,31 b) and the housing flange (32, 32a,32 b) in an interior cavity of the filter head housing (30, 30a,30 b), the housing step (321) together with the filter head base (50) maintaining an axial position of the valve body (40).

8. The filter head (20, 20a,20 b) of claim 7, wherein the valve body (40) further comprises a valve body flange (42), the valve body flange (42) being located radially outward of the valve body (41), and a valve body step (421) being formed between the valve body (41) and the valve body flange (42) in an inner cavity of the valve body (40), wherein the valve body flange (42) is mounted between the filter head base (50) and the housing step (321).

9. The filter head (20, 20a,20 b) of claim 8, wherein an inner surface of the peripheral wall of the valve body flange (42) is provided with a protrusion (422), the protrusion (422) being configured to be operated to rotate the valve body (40) relative to the filter head housing (30, 30a,30 b).

10. Filter head (20, 20a,20 b) according to any one of claims 1 to 9, wherein the housing body (31, 31A,31 b) is provided with a plurality of filter heads extending along the housing body (31, 31A,

31B) A first set of tubular portions, a second set of tubular portions and a third set of tubular portions spaced apart from each other, one tubular portion of the first set of tubular portions forming the raw water port (P1), one tubular portion of the second set of tubular portions forming the first water outlet port (P2), one tubular portion of the third set of tubular portions forming the second water outlet port (P3).

11. The filter head (20, 20a,20 b) of claim 10, wherein the raw water port (P1), the first water outlet port (P2), and the second water outlet port (P3) are axially aligned.

12. The filter head (20, 20a,20 b) of claim 10, wherein the outer peripheral wall of the housing body (31, 31a,31 b) is provided with ribs extending circumferentially along the outer peripheral wall of the housing body.

13. The filter head (20, 20a,20 b) of claim 12, wherein the ribs include a first annular rib (318) and a second annular rib (319), the first annular rib (318) being disposed between the first set of tubular portions and the second set of tubular portions, the second annular rib (319) being disposed between the second set of tubular portions and the third set of tubular portions; and/or

The rib includes an arcuate rib extending circumferentially along the outer peripheral wall of the housing body between the tubular portions of each of the first, second, and third sets of tubular portions.

14. The filter head (20, 20a,20 b) of claim 12, wherein the first, second, third, and ribs of the housing body are integrally formed by injection molding.

15. A filter (1), the filter (1) comprising a filter cartridge (10), the filter cartridge (10) being provided with a fluid inlet (111) and a fluid outlet;

characterized in that the filter further comprises a filter head (20, 20a,20 b) according to any one of claims 1 to 14,

wherein the fluid inlet (111) and the fluid outlet of the filter cartridge (10) are mounted

In the inner cavity of the valve body (41) of the filter head (20, 20a,20 b), the fluid inlet (111) is in fluid communication with the raw water port (P1), and the fluid outlet is in communication with one or both of the first and second water outlet ports (P2, P3).

16. The filter (1) according to claim 15, wherein the fluid outlet comprises a first fluid outlet (112) and a second fluid outlet (113), the first fluid outlet (112) being in fluid communication with the first water outlet port (P2), the second fluid outlet (113) being in fluid communication with the second water outlet port (P3).

17. The filter (1) according to claim 15, wherein the cartridge (10) is provided with a retaining recess (115), the retaining recess (115) fitting to a projection (422) of the valve body (40) such that the valve body (40) can rotate with the cartridge (10) to the conducting position or the closed position.

18. The filter (1) according to claim 17, wherein the cartridge (10) is provided with a mounting portion (114), the inner wall of the filter head base (50) is provided with a holding portion (53), the mounting portion (114) moves along the holding portion (53) when the valve body (40) rotates with the cartridge (10),

In the on position, the mounting portion (114) is restrained between the holding portion (53) and a valve body step portion (421) of the valve body (40), and in the off position, the mounting portion (114) is separated from the holding portion (53).

19. The filter (1) according to claim 18, wherein the retaining recess (115) is provided on the mounting portion (114).

20. A filter unit (100, 200) comprising a plurality of filters according to any of claims 15-19, a plurality of said filters being in fluid connection with each other.

21. The filter unit according to claim 20, wherein the plurality of filters includes a first filter and a second filter, and the filter unit is provided with:

a water inlet connected to a raw water port of the first filter;

a first water outlet connected to a second water outlet port of the first filter;

a second water outlet connected to the first water outlet port of the second filter; and

a third water outlet connected to a second water outlet port of the second filter,

wherein the first water outlet port of the first filter is connected to the raw water port of the second filter.

22. The filter assembly of claim 21, wherein the plurality of filters further comprises a third filter.

23. The filter assembly of claim 22, wherein one of the raw water port, the first water outlet port, and the second water outlet port of the second filter is in fluid communication with the raw water port of the third filter.

24. The filter assembly of claim 23, wherein the raw water port of the second filter is in fluid communication with the raw water port of the third filter, the first outlet port of the third filter being connected to the second outlet port, the second outlet port of the third filter being connected to the third outlet port.

25. The filter assembly of any one of claims 21-24, wherein the filter cartridge of the first filter is a pre-filtration composite filter cartridge and the filter cartridge of the second filter is a reverse osmosis membrane filter cartridge.