CN210885548U - Combined water purifying filter element - Google Patents

Abstract

The utility model discloses a combined water purification filter element, which relates to the technical field of water purifiers and solves the problems that a plurality of filter layers are simply arranged in a series connection manner, and the series arrangement of the filter layers needs to occupy a large number of places, thereby causing the limitation on the filtration of water and being inconvenient for the application of the water purifier; the third-stage filtering component and the first-stage filtering component are isolated from each other, and the third-stage filtering component is arranged in the first-stage filtering component; the shell is provided with a first water inlet end, a first water outlet end for discharging water after primary filtration, a third water inlet end and a third water outlet end, so that the occupied area of the filtering device can be effectively reduced, the application range of the filtering device is convenient to improve, and the purpose of reducing the influence of too much occupied space caused by arrangement of the multistage filtering assemblies in a large area is achieved.

Description

Combined water purifying filter element

Technical Field

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

Background

With the development of society, water purifiers are widely applied to various fields, and people have higher and higher requirements on sanitation of drinking water, so that the requirements on water purifying equipment are higher and higher, and the requirements on the water purifying equipment are also higher and higher. Water purifiers are increasingly playing an important role in people's daily life. In order to achieve the best filtering and purifying effect, a filter element is usually installed in the water purifier to filter and purify water, and then the water flows into a water tank to be stored for people to drink.

In order to effectively improve the efficiency of water purification, a plurality of filter layers are generally communicated and arranged in series, and the water body can obtain purified water after being filtered by the filter layers.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a modular water purification filter core has the area occupied that can reduce filter equipment effectively, and then is convenient for improve filter equipment's range of application to reduce the advantage that the space that the large tracts of land was arranged multistage filter assembly and is leaded to occupy too much influence.

The above technical purpose of the present invention can be achieved by the following technical solutions: a combined water purification filter element comprises a shell and a filtering device arranged in the shell, wherein the filtering device comprises a first-stage filtering component for primary filtering and a third-stage filtering component for water purification filtering; the third stage filtering component and the first stage filtering component are isolated from each other, and the third stage filtering component is arranged in the first stage filtering component; the shell is provided with a first water inlet end for raw water to flow in, a first water outlet end for primarily filtered water to flow in, a third water inlet end for purified water to flow in and a third water outlet end for purified water filtered water to flow out, and the first water inlet end, the first-stage filtering component and the first water outlet end are sequentially communicated to form a first-stage filtering channel; and the third water inlet end, the third-stage filtering component and the third water outlet end are sequentially communicated to form a third-stage filtering channel.

By adopting the technical scheme, when the water filter works, a water body firstly flows into the first-stage filtering component from the first water inlet end to be filtered for the first time; then flows out of the first water outlet end and flows into the second-stage filtering component for secondary filtering; then flows out of the second stage filtering component, then flows into the third stage filtering component through the third water inlet end for third filtering, and finally is output to a user through the third water outlet end. Through the stepped three-stage filtration, impurities in the water body can be effectively filtered, so that the water purification effect is improved; secondly, set up third level filtering component in second level filtering component, can reduce filter equipment's area occupied effectively, and then be convenient for improve filter equipment's range of application to reduce the too much influence of space occupation that the multistage filtering component of large tracts of land arrangement leads to.

In the further arrangement of the utility model, a first stage water filtering back channel is formed between the first stage filtering component and the third stage filtering component; a first water filtering port communicated with the first-stage water filtering rear channel is arranged in the first-stage filtering assembly, and a first filtering layer for first-stage filtering is wrapped outside the first water filtering port; a first-stage water filtering front channel isolated from the first-stage water filtering rear channel is formed between the first-stage filtering component and the shell; a third water filtering port communicated to a third water outlet end is arranged in the third-stage filtering component, a third filtering layer for three-stage filtering is wrapped outside the third water filtering port, and a third-stage water filtering front channel is formed between the third filtering layer and the third-stage filtering component; the first water inlet end, the first-stage water filtering front channel, the first filtering layer, the first-stage water filtering rear channel and the first water outlet end are sequentially communicated to form a first-stage filtering channel; and the third water inlet end, the third stage water filtering front channel, the third filtering layer and the third water outlet end form a third stage filtering channel.

By adopting the technical scheme, when the water purifier works, a water body enters the first-stage water filtering front channel from the first water inlet end, then flows into the first filtering layer, is filtered by the first filtering layer, then flows out of the first-stage water filtering rear channel and finally flows out of the first water outlet end; the first water outlet end is connected with a second-stage filtering component, the water body is filtered for the second time through the second-stage filtering component, and then the second-stage filtering component is connected with the third water inlet end; and then, the water flows into the third water inlet end after flowing out of the second-stage filtering component, then flows into the third filtering layer through the third-stage water filtering front channel for third filtering, and finally flows out of the third water outlet end after passing through the third-stage water filtering rear channel. Can form the passageway that can supply the water body to flow through the interval between first order filtering component and the tertiary filtering component, can make first order filtering component and tertiary filtering component become an organic whole and the passageway that usable this interval formed is connected, and then be convenient for reduce the inconvenience that the pipeline set up, improved holistic space utilization effectively, under the condition of the multistage filtration of guaranteeing the water, still can reduce multistage filter layer and set up shared space.

The utility model discloses a further setting, first order filter assembly includes first filtration top cap and first filtration bottom cap that link to each other with the casing, be provided with the first end cover between first filtration top cap and the first filtration bottom cap, first order drainage front aisle forms between first filtration top cap and the casing; the first end cover is provided with a first column tube extending towards the first filtering bottom cover, a first water filtering port and a first water filtering channel communicated with the first water filtering port are formed in the first column tube, and the first filtering layer is wrapped on the first column tube.

Through adopting above-mentioned technical scheme, because first end cover and first bottom are pegged graft respectively in first filter layer both ends, can make first filter layer easy to assemble and dismantle to in the installation and removal and the change of first filter layer, after first filter layer has accumulated a large amount of impurity, the accessible is convenient for change first filter layer so that improve holistic filtration efficiency. The water flows into the first filter layer, flows out of the first water outlet end after the first filtration is finished, and then flows to the first water outlet end through the first column tube.

The utility model is further provided with a first lug which is matched with the first column tube to fix the first filter layer and is arranged on the first filter bottom cover; a first through hole for water to flow in is formed between the first lug and the first column tube.

Through adopting above-mentioned technical scheme, can make first end cover and first bottom insert respectively in the first through-hole after can not take place mutual conflict to in the laminating degree of improving first end cover and first bottom and first filter layer, and then be convenient for improve first order filtering component's wholeness. Secondly, the water body only can flow into the first through hole through the space between the first water pipe and the first lug, so that the water body can flow into the space only through the first filter layer with larger flow, and the filtering efficiency of the water body is further improved effectively.

The utility model discloses a further setting, the tertiary filter assembly includes keeps apart from the holding box of first order drainage back pass, the third water inlet end forms on the holding box, be provided with third in the holding box and filter top cap and third and filter the bottom; a third column tube extending to a third filtering bottom cover is arranged on the third filtering top cover, and the third filtering layer is wrapped on the third column tube; and a third water filtering port and a third water filtering channel communicated with the third water filtering port and the third water outlet end are arranged in the third column pipe.

Through adopting above-mentioned technical scheme, on the same principle, because third end cover and third bottom peg graft respectively in third filter layer both ends, can make third filter layer easy to assemble and dismantle to install and remove and change of third filter layer, after the third filter layer has accumulated a large amount of impurity, the accessible is convenient for change the third filter layer so that improve holistic filtration efficiency. And the water flows into the third filter layer, flows out of the third water outlet end after the third filtration is finished, and then flows to the third water outlet end through the third water pipe.

The utility model is further provided with a third lug which is matched with the third column tube to fix the third filter layer and is arranged on the third filter bottom cover; and a third through hole for water to flow in is formed between the third column tube and the third bump.

Through adopting above-mentioned technical scheme, can make third end cover and third bottom insert respectively and can not take place mutual conflict after the third through hole to in the laminating degree of improving third end cover and third bottom and third filter layer, and then be convenient for improve tertiary filter assembly's wholeness. Secondly, the water body can only flow into the third through hole through the space between the third water pipe and the third bump, so that the water body can flow into the space only through the larger third filter layer, and the filtering efficiency of the water body is further improved effectively.

The utility model is further provided with that the shell comprises a main end cover and a cylinder body which are sequentially connected along the axial direction of the shell; the first end cover is connected to the inner wall of the general end cover in a threaded mode.

The utility model discloses a further setting, total end cover, first end cover and the coaxial setting of third end cover three, third end cover threaded connection is on the inner wall of first end cover.

Through adopting above-mentioned technical scheme, can be so that first order filtering component, tertiary filtering component and casing are fixed as an organic whole, because the flow of water in the filter layer can receive great resistance, consequently can be convenient for reduce because the water flows whole that leads to and rock to in improve the filterable stability of water, the mounting structure of screw thread formula can be convenient for first order filtering component and tertiary filtering component's installation and dismantlement.

The utility model discloses a further setting, first filtration top cap with the mutual sealing connection of first end cap is formed with and keeps apart in the inside accommodation space of casing, third level filtering component set up in the accommodation space, just first drainage passageway intercommunication extremely in the accommodation space.

Through adopting above-mentioned technical scheme, can be convenient for improve casing inner space's leakproofness effectively.

The utility model discloses a further setting, first filter layer includes folding PP filter layer and the sintering charcoal filter layer that sets gradually along water flow direction.

Through adopting above-mentioned technical scheme, folding filter core adopts foldingly, and membrane filtration area is big, and it is big to receive the filth volume, and the pressure differential is low, long service life, and the whole 100% pure PP material of filter core has extensive chemical phase capacity. The first filter layer adopts the combination of the folding PP filter layer and the sintered carbon filter layer, can effectively carry out primary filtration on a water body, and can effectively reduce the probability of blockage of the sintered carbon filter layer after the scale inhibitor is added in the sintered carbon filter layer, so as to further prolong the service life of the first filter layer.

The utility model discloses a further setting, second grade filtering component is RO membrane filter.

Through adopting above-mentioned technical scheme, select for use the RO membrane as second grade filtering component, can improve the purification efficiency of water effectively. The RO film can effectively remove calcium, magnesium, bacteria, organic matters, inorganic matters, metal ions, radioactive substances and the like in water, and the crystal purified by the device is clear and sweet and mellow.

The utility model discloses a further setting, the third filter layer is the active carbon filter layer.

By adopting the technical scheme, the active carbon adsorption means that the purpose of purifying water quality is achieved by utilizing the adsorption effect of the solid surface of the active carbon on one or more substances in water. The adsorption capacity of activated carbon is related to the pore size and structure of the activated carbon. Generally, the smaller the particle, the faster the pore diffusion rate, and the stronger the adsorption capacity of the activated carbon.

To sum up, the utility model discloses following beneficial effect has:

1. the occupied area of the filtering device can be effectively reduced, so that the application range of the filtering device is conveniently improved, and the influence of excessive occupied space caused by arrangement of a plurality of filtering assemblies in a large area is reduced;

2. the stepped three-stage filtration can effectively filter impurities in the water body so as to improve the water purification effect;

3. the structure of easy to assemble and dismantlement can be convenient for the change and the maintenance of filtering component at different levels to improve the effect of water purification.

Generally speaking the utility model discloses, can reduce filter equipment's area occupied effectively, and then be convenient for improve filter equipment's range of application to reduce the large tracts of land and arrange the space that multistage filter assembly leads to and occupy too much influence.

Drawings

Fig. 1 is a schematic structural diagram of a combined water purification cartridge in the embodiment;

FIG. 2 is a top view of the combined water purification cartridge of the present embodiment;

FIG. 3 is a cross-sectional view taken along the plane A-A in FIG. 2;

FIG. 4 is an enlarged view at A in FIG. 3;

fig. 5 is an enlarged view at B in fig. 3.

Reference numerals: 2. a filtration device; 3. a housing; 31. a main end cap; 32. a barrel; 4. a first stage filter assembly; 41. a first water inlet end; 42. a first water outlet end; 43. a first filter layer; 431. folding the PP filter layer; 432. sintering the carbon filter layer; 44. a first column tube; 45. a first bump; 46. a first through hole; 48. a first filter cap; 49. a first filter bottom cap; 5. a second stage filter assembly; 6. a third stage filtration assembly; 61. a third water inlet end; 62. a third water outlet end; 63. a third filter layer; 64. a third column tube; 65. a third bump; 66. a third through hole; 68. a third filter cap; 69. a third filter bottom cap; 7. a first stage filtration channel; 71. a first stage water filtration front channel; 72. a first stage post-filtration channel; 73. a first water filtering port; 8. a third stage filtration channel; 81. a third stage pre-filtration channel; 82. a third stage post-filtration channel; 84. a third water filtering opening; 9. a first end cap; 10. accommodating the box; 11. a first water filtration channel; 12. a third water filtration channel; 13. an accommodation space.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

A combined water purification filter element, as shown in fig. 1 to 5, comprising a housing 3 and a filter device 2 arranged in the housing 3, wherein the filter device 2 comprises a first stage filter component 4 for primary filtration and a third stage filter component 6 for purified water filtration; the first filter layer 43 includes a folded PP filter layer 431 and a sintered carbon filter layer 432 which are sequentially disposed along the flow direction of the water body. The folding filter element is of a folding type, the membrane filtering area is large, the pollutant carrying capacity is large, the pressure difference is low, the service life is long, the whole filter element is made of 100% pure PP materials, and the folding filter element has wide chemical phase capacity. The first filter layer 43 adopts the combination of the folded PP filter layer 431 and the sintered carbon filter layer 432, so that the water body can be effectively subjected to primary filtration, and after the scale inhibitor is added into the sintered carbon filter layer 432, the probability of blockage of the sintered carbon filter layer 432 can be effectively reduced, so that the service life of the first filter layer 43 is further prolonged. The second stage filtration module 5 is an RO membrane filter. The RO membrane is selected as the second-stage filtering component 5, so that the purification efficiency of the water body can be effectively improved. The RO film can effectively remove calcium, magnesium, bacteria, organic matters, inorganic matters, metal ions, radioactive substances and the like in water, and the crystal purified by the device is clear and sweet and mellow.

The third filter layer 63 is an activated carbon filter layer. The active carbon adsorption means that the solid surface of the active carbon is used for adsorbing one or more substances in water so as to achieve the aim of purifying the water. The adsorption capacity of activated carbon is related to the pore size and structure of the activated carbon. Generally, the smaller the particle, the faster the pore diffusion rate, and the stronger the adsorption capacity of the activated carbon.

The third stage filtering component 6 and the first stage filtering component 4 are isolated from each other, and the third stage filtering component 6 is arranged in the first stage filtering component 4; the shell 3 is provided with a first water inlet end 41 for raw water to flow in, a first water outlet end 42 for primarily filtered water to flow out, a third water inlet end 61 for purified water to flow in and a third water outlet end 62 for purified water filtered water to flow out, and the first water inlet end 41, the first-stage filtering component 4 and the first water outlet end 42 are sequentially communicated to form a first-stage filtering channel 7; the third water inlet end 61, the third stage filtering component 6 and the third water outlet end 62 are communicated in sequence to form a third stage filtering channel 8.

When the water filter works, water firstly flows into the first-stage filtering component 4 from the first water inlet end 41 to be filtered for the first time; then flows out of the first water outlet end 42 and flows into the second stage filtering component 5 for secondary filtering; then flows out of the second stage filtering component 5, then flows into the third stage filtering component 6 through the third water inlet end 61 for third filtering, and finally is output to the user through the third water outlet end 62. Through the stepped three-stage filtration, impurities in the water body can be effectively filtered, so that the water purification effect is improved; secondly, set up third level filtering component 6 in second level filtering component 5, can reduce filter equipment 2's area occupied effectively, and then be convenient for improve filter equipment 2's range of application to reduce the too much influence of space occupation that the multistage filtering component of large tracts of land arrangement leads to.

A first-stage filtered water rear channel 72 is formed between the first-stage filtering component 4 and the third-stage filtering component 6; a first water filtering port 73 communicated with the first-stage water filtering rear channel 72 is arranged in the first-stage filtering component 4, and a first filtering layer 43 for first-stage filtering is wrapped outside the first water filtering port 73; a first-stage water-filtering front channel 71 isolated from a first-stage water-filtering rear channel 72 is further formed between the first-stage filtering component 4 and the shell 3, the first filtering top cover 48 and the first end cover 9 are mutually connected in a sealing manner and are provided with an accommodating space 13 isolated from the inside of the shell 3, the third-stage filtering component 6 is arranged in the accommodating space 13, the first water-filtering channel 11 is communicated to the accommodating space 13, the first-stage water-filtering rear channel 72 is isolated from the accommodating space 13 of the first-stage water-filtering front channel 71 and the first-stage water-filtering rear channel 72, the first water-filtering channel 11 is a unique channel for communicating the accommodating space 13 with the inside of the shell 3, and the sealing performance of the inner space of the shell 3 can be effectively improved.

A third water filtering port 84 communicated with the third water outlet end 62 is arranged in the third stage filtering component 6, a third filtering layer 63 for three-stage filtering is wrapped outside the third water filtering port 84, and a third stage water filtering front channel 81 is formed between the third filtering layer 63 and the third stage filtering component 6; the first water inlet end 41, the first stage water filtering front channel 71, the first filtering layer 43, the first stage water filtering rear channel 72 and the first water outlet end 42 are communicated in sequence to form a first stage filtering channel 7; the third water inlet end 61, the third stage pre-filtration channel 81, the third filtration layer 63 and the third water outlet end 62 form a third stage filtration channel 8.

During operation, a water body enters the first-stage water filtering front channel 71 from the first water inlet end 41, then flows into the first filtering layer 43, is filtered by the first filtering layer 43, then flows out from the first-stage water filtering rear channel, and finally flows out from the first water outlet end 42; the first water outlet end 42 is connected with a second-stage filtering component 5, the water body is filtered for the second time through the second-stage filtering component 5, and then the second-stage filtering component 5 is connected with a third water inlet end 61; subsequently, the water flows out of the second stage filtering assembly 5 and flows into the third water inlet end 61, then flows into the third filtering layer 63 through the third stage pre-filtering channel 81 for third filtering, and finally flows out of the third water outlet end 62 through the third stage post-filtering channel 82. Can form the passageway that can supply the water body to flow through the interval between first order filtering component 4 and the tertiary filtering component 6, can make first order filtering component 4 and tertiary filtering component 6 become an organic whole and the passageway that usable this interval formed is connected, and then be convenient for reduce the inconvenience that the pipeline set up, holistic space utilization has been improved effectively, under the condition of the multistage filtration of guaranteeing the water, still can reduce the shared space of multistage filter layer setting.

The first-stage filtering component 4 comprises a first filtering top cover 48 and a first filtering bottom cover 49 which are connected with the shell 3, a first end cover 9 is arranged between the first filtering top cover 48 and the first filtering bottom cover 49, and a first-stage water filtering front channel 71 is formed between the first filtering top cover 48 and the shell 3; the first end cover 9 is provided with a first cylindrical tube 44 extending to the first filter bottom cover 49, and a first water filtering port 73 and a first water filtering channel 11 communicated with the first water filtering port 73 are formed in the first cylindrical tube 44. First filter layer 43 is wrapped around first cylindrical tube 44. Because first end cap 9 and first bottom peg graft respectively in first filter layer 43 both ends, can make first filter layer 43 easy to assemble and dismantle to in the installation and removal and the change of first filter layer 43, after first filter layer 43 has accumulated a large amount of impurity, the accessible is convenient to change first filter layer 43 so that improve holistic filtration efficiency. The water flows into the first filter layer 43, flows out of the first outlet end 42 after the first filtration, and then flows through the first column tube 44 to the first outlet end 42.

The first filter bottom cover 49 is provided with a first projection 45 which is matched with the first column tube 44 to fix the first filter layer 43; first through-hole 46 that is formed with the water inflow between first lug 45 and the first pillar 44 can make first end cap 9 and first bottom insert respectively and can not take place mutual conflict in the first through-hole 46 to improve the laminating degree of first end cap 9 and first bottom and first filter layer 43, and then be convenient for improve first order filter assembly 4's wholeness. Secondly, the water body can only flow into the first through hole 46 through the space between the first water pipe and the first bump 45, and therefore the water body can flow into the space only through the first filter layer 43, which is relatively large, and further the filtering efficiency of the water body is effectively improved.

The third stage filtering assembly 6 comprises a containing box 10 isolated from the first stage post-filtered water channel 72, and the isolation from the first stage post-filtered water channel 72 means that the containing box 10 is partially separated from the first stage post-filtered water channel 72. The third water inlet end 61 is formed on the containing box 10, and a third filtering top cover 68 and a third filtering bottom cover 69 are arranged in the containing box 10; a third column tube extending to a third filter bottom cover 69 is arranged on the third filter top cover 68, and the third filter layer 63 is wrapped on the third column tube; the third column pipe is provided with a third water filtering port 84 and a third water filtering channel 12 which is communicated with the third water filtering port 84 and the third water outlet end 62. Similarly, because the third end cap and the third bottom cap are respectively inserted into two ends of the third filter layer 63, the third filter layer 63 can be conveniently mounted and dismounted, so that the third filter layer 63 can be conveniently mounted, dismounted and replaced, and after a large amount of impurities are accumulated in the third filter layer 63, the third filter layer 63 can be conveniently replaced by the third filter layer 63, so that the overall filtering efficiency is improved. The water flows into the third filter layer 63, passes through the third outlet end 62 after the third filtration, and then flows to the third outlet end 62 through the third water pipe.

The third filter bottom cover 69 is provided with a third bump 65 which is matched with the third column tube to fix the third filter layer 63; a third through hole 66 for water to flow in is formed between the third column tube and the third bump 65, so that the third end cover and the third bottom cover can not be mutually butted after being respectively inserted into the third through hole 66, the fitting degree of the third end cover and the third bottom cover with the third filter layer 63 can be conveniently improved, and the integrity of the third stage filter assembly 6 can be conveniently improved. Secondly, the water body can only flow into the third through hole 66 through the space between the third water pipe and the third bump 65, so that the water body can flow into the space only through the larger third filter layer 63, and the filtering efficiency of the water body is further improved effectively.

The shell 3 comprises a general end cover 31 and a cylinder 32 which are sequentially connected along the axial direction of the shell 3; the first end cap 9 is screwed to the inner wall of the main end cap 31. Total end cover 31, first end cover 9 and the coaxial setting of third end cover three, third end cover threaded connection is on the inner wall of first end cover 9, can be so that first order filtering component 4, third order filtering component 6 and casing 3 are fixed as an organic whole, because the flow of water in the filter layer can receive great resistance, consequently can be convenient for reduce because the whole that the water flow leads to rocks, so that improve the filterable stability of water, the mounting structure of screw thread formula can be convenient for first order filtering component 4 and third order filtering component 6's installation and dismantlement.

The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications to the present embodiment without inventive contribution as required after reading the present specification, but all of them are protected by patent laws within the scope of the claims of the present invention.

Claims (10)

1. A combined water purification filter element comprises a shell (3) and a filter device (2) arranged in the shell (3), and is characterized in that the filter device (2) comprises a first-stage filter component (4) for primary filtration and a third-stage filter component (6) for purified water filtration; the third-stage filtering component (6) and the first-stage filtering component (4) are isolated from each other, and the third-stage filtering component (6) is arranged in the first-stage filtering component (4); the shell (3) is provided with a first water inlet end (41) for raw water to flow in, a first water outlet end (42) for water to flow out after primary filtration, a third water inlet end (61) for purified water to flow in and a third water outlet end (62) for water to flow out after purified water filtration, and the first water inlet end (41), the first stage filtering component (4) and the first water outlet end (42) are sequentially communicated to form a first stage filtering channel (7); and the third water inlet end (61), the third-stage filtering component (6) and the third water outlet end (62) are sequentially communicated to form a third-stage filtering channel (8).

2. A combined water purification cartridge according to claim 1, wherein a first stage filtered water post channel (72) is formed between the first stage filter assembly (4) and the third stage filter assembly (6); a first water filtering port (73) communicated with the first-stage water filtering rear channel (72) is arranged in the first-stage filtering assembly (4), and a first filtering layer (43) for first-stage filtering is wrapped outside the first water filtering port (73); a first-stage water-filtering front channel (71) isolated from a first-stage water-filtering rear channel (72) is also formed between the first-stage filtering component (4) and the shell (3); a third water filtering port (84) communicated with a third water outlet end (62) is arranged in the third stage filtering assembly (6), a third filtering layer (63) for three-stage filtering is wrapped outside the third water filtering port (84), and a third stage pre-filtering channel (81) is formed between the third filtering layer (63) and the third stage filtering assembly (6); the first water inlet end (41), the first-stage water filtering front channel (71), the first filtering layer (43), the first-stage water filtering rear channel (72) and the first water outlet end (42) are communicated in sequence to form a first-stage filtering channel (7); and the third water inlet end (61), the third stage water filtering front channel (81), the third filtering layer (63) and the third water outlet end (62) form a third stage filtering channel (8).

3. A combined water purification cartridge according to claim 2, wherein the first stage filter assembly (4) comprises a first filter top cap (48) and a first filter bottom cap (49) connected to the housing (3), a first end cap (9) is provided between the first filter top cap (48) and the first filter bottom cap (49), and the first stage pre-filter channel (71) is formed between the first filter top cap (48) and the housing (3); the first end cover (9) is provided with a first column tube (44) extending to the first filtering bottom cover (49), a first water filtering opening (73) and a first water filtering channel (11) communicated with the first water filtering opening (73) are formed in the first column tube (44), and the first filtering layer (43) is wrapped on the first column tube (44).

4. A modular water purification cartridge as claimed in claim 3, wherein the first filter bottom cover (49) is provided with a first projection (45) cooperating with the first post (44) to secure the first filter layer (43); a first through hole (46) for water to flow in is formed between the first lug (45) and the first column tube (44).

5. A combined water purification cartridge according to claim 3, wherein the first filter cap (48) and the first end cap (9) are sealingly connected to each other and form a receiving space (13) isolated from the interior of the housing (3), the third stage filter assembly (6) is disposed in the receiving space (13), and the first water filtration channel (11) communicates into the receiving space (13).

6. A combined water purification cartridge according to claim 2, wherein the third stage filtration assembly (6) comprises a housing box (10) isolated from the first stage post-filtration channel (72), the third water inlet end (61) is formed on the housing box (10), and a third filtration top cover (68) and a third filtration bottom cover (69) are arranged in the housing box (10); a third column tube extending to a third filter bottom cover (69) is arranged on the third filter top cover (68), and the third filter layer (63) is wrapped on the third column tube; and a third water filtering opening (84) and a third water filtering channel (12) communicated with the third water filtering opening (84) and the third water outlet end (62) are arranged in the third column pipe.

7. A combined water purification cartridge according to claim 6, wherein the third filter bottom cap (69) is provided with a third projection (65) for cooperating with a third cylindrical tube to fix the third filter layer (63); a third through hole (66) for water to flow in is formed between the third pillar tube and the third bump (65).

8. A modular water purification cartridge as claimed in claim 1, wherein the housing (3) comprises a main end cap (31) and a cartridge (32) which are axially and sequentially connected along the housing (3), the first water inlet end (41), the first water outlet end (42), the third water inlet end (61) and the third water outlet end (62) being formed on the main end cap (31).

9. A combined water purification cartridge according to claim 2, wherein the first filter layer (43) comprises a folded PP filter layer (431) and a sintered carbon filter layer (432) arranged in sequence along the direction of water flow.

10. A combined water purification cartridge according to claim 2, wherein the third filter layer (63) is an activated carbon filter layer.

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