CN214990674U - Composite RO (reverse osmosis) membrane filter element - Google Patents

Abstract

The utility model discloses a composite RO membrane filter element, which is applied to a waterway system of a water purifier, and comprises a shell, a primary filtering module and an RO membrane filtering module which are not communicated with each other; the RO membrane filtering module is arranged on the shell and comprises an RO membrane module and a water collecting pipe; the RO membrane assembly is sleeved on the outer side of the water collecting pipe and communicated with the water collecting pipe; the primary filtering module is arranged in the water collecting pipe. The composite RO membrane filter element integrates the primary filter module and the RO membrane filter module together, reduces the number of the whole filter elements in the water purifier, saves the space inside the water purifier, and solves the problem of large occupied space of the water purifier. And the primary filtering module and the RO membrane filtering module are independently operated and are not communicated with each other, so that the phenomenon of water leakage is avoided.

Description

Composite RO (reverse osmosis) membrane filter element

Technical Field

The utility model relates to a water purifier technical field especially relates to a compound RO membrane filter core.

Background

At present, with the development of society, people pay more and more attention to health problems, and as tap water contains a lot of substances which are not beneficial to health, more and more people can set water purifying equipment at home to filter the tap water; most water purifiers in the current market adopt a three-level or four-level filtering mode, namely a PP (polypropylene) filter element, an activated carbon filter element, an RO (reverse osmosis) filter element, a rear activated carbon filter element and the like. Each filter core is installed respectively in the complete machine, through water route interconnect in order to carry out supporting work, but such purifier has occupation space big problem.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a compound RO membrane filter core to solve above-mentioned problem.

To achieve the purpose, the utility model adopts the following technical proposal:

the utility model provides a composite RO membrane filter element, which is applied to a waterway system of a water purifier, and comprises a shell, a primary filtering module and an RO membrane filtering module which are not communicated with each other; the RO membrane filtering module is arranged on the shell and comprises an RO membrane module and a water collecting pipe; the RO membrane assembly is sleeved on the outer side of the water collecting pipe and communicated with the water collecting pipe; the primary filtering module is arranged in the water collecting pipe;

a raw water inlet, a primary filtering water outlet, a pure water inlet, a pure water outlet and a waste water outlet are formed in the outer side of the shell; the raw water inlet is communicated with the water inlet end of the primary filtering module, and the primary filtering water outlet is communicated with the water outlet end of the primary filtering module; the pure water inlet is communicated with the water inlet end of the RO membrane filtering module, the pure water outlet is communicated with the pure water outlet end of the RO membrane filtering module, and the wastewater outlet is communicated with the wastewater outlet end of the RO membrane filtering module.

In the composite RO membrane filter element, a first water-proof ring, a second water-proof ring and a third water-proof ring are sequentially arranged inside the shell from outside to inside; the RO membrane filtration module also comprises a filtration assembly upper cover and a purified water pipe;

the upper cover of the filtering component is arranged at the wastewater outlet end of the RO membrane component, and the upper cover of the filtering component is provided with an avoidance hole and a wastewater hole; the axis of the avoidance hole is superposed with the axis of the upper cover of the filtering assembly, and the waste water hole is circumferentially arranged by taking the axis of the avoidance hole as a center; the water purifying pipe is arranged in the water collecting pipe, and the primary filtering module is sleeved on the outer side of the water purifying pipe; the avoidance hole provides an avoidance space for the primary filtering module;

a pure water channel is formed in a space between the inner wall of the shell, the outer wall of the first water-isolating ring, the outer wall of the upper cover of the filtering assembly and the outer wall of the RO membrane assembly, and the raw water inlet is communicated with the pure water channel;

a space between the outer wall of the upper cover of the filtering component, the inner wall of the first water-proof ring and the outer wall of the second water-proof ring forms a wastewater channel; one end of the waste water channel is communicated with the waste water hole, and the other end of the waste water channel is communicated with the waste water outlet;

a water purification channel is formed in a space among the inner wall of the water collecting pipe, the outer wall of the primary filtering module, the inner wall of the water purifying pipe and the inner wall of the third water-isolating ring; the water purification channel is communicated with the water purification water outlet.

In the composite RO membrane filter element, a fixed lug is arranged on the top surface of the upper cover of the filter assembly, and the avoidance hole and the waste water hole are respectively arranged on the fixed lug; a fixing ring is arranged on the outer side of the avoidance hole;

the outer side wall of the fixing lug is tightly attached to the inner wall of the first water-proof ring, the inner wall of the second water-proof ring is tightly attached to the inner wall of the fixing ring, and the outer wall of the near end of the upper end of the water purifying pipe is tightly attached to the inner wall of the third water-proof ring.

In the composite RO membrane filter element, the inner wall of the upper cover of the filter assembly is provided with a support ring; the support ring is abutted against the top surface of the RO membrane assembly, and the inner wall of the support ring is tightly attached to the outer wall at the proximal end of the upper end of the water collecting pipe;

and the outer wall of the support ring, the inner wall of the upper cover of the filtering assembly and the top surface of the RO membrane assembly form an accommodating space for the outflow of wastewater.

In the composite RO membrane filter element, the outer wall of the outer side wall of the fixed lug, the inner wall of the fixed ring, the outer wall of the upper end near end of the water purifying pipe and the outer wall of the upper end near end of the water collecting pipe are respectively provided with a first check valve.

In the composite RO membrane filter element, the primary filtering module comprises a primary filtering upper cover, a filter flask, a primary filtering assembly and a lower cover, wherein the primary filtering assembly and the lower cover are arranged in the filter flask;

the primary filtering upper cover is arranged at the upper end of the filter flask and is provided with a first through hole and a raw water inlet for raw water to enter; the bottom surface of the filter flask is provided with a water purification through hole; the top surface of the filter bottle is tightly abutted against the upper cover of the filter component, and a primary filter gap is formed between the filter bottle and the primary filter component;

the upper end of the primary filter assembly is inserted into the primary filter upper cover, and the lower end of the primary filter assembly is inserted into the lower cover; the lower cover is inserted into the inner bottom surface of the filter flask and is provided with a second through hole communicated with the water purifying through hole; the lower end of the water purifying pipe is inserted into the second through hole; the upper end of the water purifying pipe penetrates through the first through hole and is communicated with the third water isolating ring.

In the composite RO membrane filter element, a primary filtering water-isolating ring is arranged between the second water-isolating ring and the third water-isolating ring of the shell, and a blocking ring is arranged on the outer side of the original water gap; the inner wall of the primary filtering water-proof ring is tightly attached to the inner wall of the isolating ring;

a space between the inner wall of the second water-isolating ring, the inner wall of the shell, the outer wall of the primary filtering water-isolating ring and the top surface of the primary filtering upper cover, and a gap between the filter bottle and the primary filtering component form a primary filtering channel, and the primary filtering channel is communicated with the primary filtering water outlet;

the space between the outer wall of third water proof ring, the outer wall of collector pipe, the inner wall of casing and the inner wall of preliminary filtration water proof ring forms the raw water passageway, the raw water passageway with raw water inlet intercommunication.

In the composite RO membrane filter element, the near end of the upper end of the filter flask, the outer wall of the partition ring and the near end of the lower end of the water collecting pipe are respectively provided with a second check valve.

In the composite RO membrane filter element, the composite RO membrane filter element further comprises a post-filtration module, the post-filtration module is arranged in the pure water channel, and the water outlet end of the post-filtration module is communicated with the water purification through hole.

Compound RO membrane filter core can have following beneficial effect:

the composite RO membrane filter element integrates the primary filter module and the RO membrane filter module together, reduces the number of the whole filter elements in the water purifier, saves the space inside the water purifier, and solves the problem of large occupied space of the water purifier. And the primary filtering module and the RO membrane filtering module are independently operated and are not communicated with each other, so that the phenomenon of water leakage is avoided.

Drawings

The accompanying drawings are provided to further illustrate the present invention, but the content in the accompanying drawings does not constitute any limitation to the present invention.

FIG. 1 is a schematic structural diagram of one embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view A-A of FIG. 1;

FIG. 3 is an enlarged view of a portion of FIG. 2 at C;

FIG. 4 is a schematic cross-sectional view B-B of FIG. 1;

FIG. 5 is an enlarged view of a portion of FIG. 4 at D;

FIG. 6 is a partial enlarged view at E in FIG. 4;

in the drawings: the device comprises a shell 1, a primary filtering module 2, an RO membrane filtering module 3, a first check valve 4, a second check valve 5 and a post-filtering module 6;

a raw water inlet 11, a primary filtering water outlet 12, a pure water inlet 13, a pure water outlet 14, a wastewater outlet 15, a first water-isolating ring 16, a second water-isolating ring 17, a third water-isolating ring 18 and a primary filtering water-isolating ring 19;

the primary filter comprises a primary filter upper cover 21, a filter flask 22, a primary filter assembly 23 and a lower cover 24; RO membrane module 31, water collecting pipe 32, filter module upper cover 33, and purified water pipe 34;

a first through hole 211, a raw water port 212, and a partition ring 213; a water purification through hole 221 and a second through hole 241; avoidance holes 331, waste water holes 332, fixing lugs 333 and fixing rings 334; supporting the ring 335.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention. Furthermore, features defined as "first" and "second" may explicitly or implicitly include one or more of the features for distinguishing between descriptive features, non-sequential, non-trivial and non-trivial.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1 to 6, the present invention provides a composite RO membrane filter element for use in a waterway system of a water purifier, the composite RO membrane filter element includes a housing 1, a primary filter module 2 and an RO membrane filter module 3 that are not connected to each other; the RO membrane filtering module 3 is arranged in the shell 1 and comprises an RO membrane module 31 and a water collecting pipe 32; the RO membrane module 31 is sleeved outside the water collecting pipe 32, and the RO membrane module 31 is communicated with the water collecting pipe 32; the primary filtration module 2 is disposed within the header 32;

a raw water inlet 11, a primary filtering water outlet 12, a pure water inlet 13, a pure water outlet 14 and a waste water outlet 15 are arranged on the outer side of the shell 1; the raw water inlet 11 is communicated with the water inlet end of the primary filtering module 2, and the primary filtering water outlet 12 is communicated with the water outlet end of the primary filtering module 2; the pure water inlet 13 is communicated with the water inlet end of the RO membrane filtering module 3, the pure water outlet 14 is communicated with the pure water outlet end of the RO membrane filtering module 3, and the waste water outlet 15 is communicated with the waste water outlet end of the RO membrane filtering module 3.

The composite RO membrane filter element integrates the primary filter module 2 and the RO membrane filter module 3 together, reduces the number of the whole filter elements in the water purifier, saves the space inside the water purifier, and solves the problem of large occupied space of the water purifier. And the primary filtering module 2 and the RO membrane filtering module 3 are independently operated and are not communicated with each other, so that the phenomenon of water leakage is avoided.

Raw water refers to unfiltered water in a waterway system. When normal system water, the raw water in the waterway system enters the primary filtering module 2 through the raw water inlet 11 and is subjected to primary filtering. The raw water is primarily filtered into primary filtered water, and flows into a primary filtering waterway of the waterway system from the primary filtering water outlet 12. The primary filtered water flows to a waterway system and then is converted into pure water; pure water enters the composite RO membrane filter element again through the pure water inlet 13, and the RO membrane filter module 3 filters the pure water into pure water and waste water; the clean water is collected in the water collecting pipe 32 and is discharged to a clean water waterway of the waterway system through the clean water outlet 14; and wastewater is discharged from the wastewater outlet end and discharged to a wastewater waterway in the waterway system through a wastewater outlet 15.

Taking fig. 5 as an example, the top surface of the RO membrane module 31 is the wastewater outlet end of the RO membrane filtration module 3, the bottom surface of the RO membrane module 31 is the water inlet end of the RO membrane filtration module 3, the upper end of the water collecting pipe 32 is the purified water outlet end of the RO membrane filtration module 3, pure water enters the RO membrane filtration module 3 from the bottom surface of the RO membrane module 31, purified water flows into the water collecting pipe 32 from the RO membrane module 31, and wastewater flows out from the top surface of the RO membrane module 31.

Specifically, a first water-proof ring 16, a second water-proof ring 17 and a third water-proof ring 18 are sequentially arranged inside the shell 1 from outside to inside; the RO membrane filtration module 3 further comprises a filtration module upper cover 33 and a purified water pipe 34;

the filtering component upper cover 33 is arranged at the wastewater outlet end of the RO membrane component 31, and the filtering component upper cover 33 is provided with avoidance holes 331 and wastewater holes 332; the axis of the avoiding hole 331 coincides with the axis of the filter assembly upper cover 33, and the waste water hole 332 is circumferentially arranged by taking the axis of the avoiding hole 331 as a center; the purified water pipe 34 is arranged in the water collecting pipe 32, and the primary filtering module 2 is sleeved outside the purified water pipe 34; the avoidance hole 331 provides an avoidance space for the primary filter module 2;

a pure water channel is formed in a space between the inner wall of the shell 1, the outer wall of the first water-proof ring 16, the outer wall of the filtering component upper cover 33 and the outer wall of the RO membrane component 31, and the raw water inlet 11 is communicated with the pure water channel;

the space between the outer wall of the filter assembly upper cover 33, the inner wall of the first water-proof ring 16 and the outer wall of the second water-proof ring 17 forms a waste water channel; one end of the waste water channel is communicated with the waste water hole 332, and the other end of the waste water channel is communicated with the waste water outlet 15;

the space between the inner wall of the water collecting pipe 32, the outer wall of the primary filtering module 2, the inner wall of the water purifying pipe 34 and the inner wall of the third water-isolating ring 18 forms a water purifying channel; the purified water channel is communicated with the purified water outlet 14.

The first water-separating ring 16, the second water-separating ring 17, the third water-separating ring 18, the RO membrane module 31, the water collecting pipe 32 and the filtering module upper cover 33 separate the interior of the housing 1 into a pure water passage, a wastewater passage and a pure water passage, which play a role in separating pure water, wastewater and pure water, thereby avoiding the occurrence of a water cross-over phenomenon.

The water inlet end and the water outlet end of the primary filter module 2 are both arranged at the upper end, the avoiding hole 331 provides an avoiding space for the primary filter module 2, so that the water inlet end and the water outlet end of the primary filter module 2 can be communicated with the raw water inlet 11 and the primary filter water outlet 12 through the avoiding hole 331 respectively.

Specifically, the top surface of the filter assembly upper cover 33 is provided with a fixing projection 333, and the avoiding hole 331 and the waste water hole 332 are respectively arranged on the fixing projection 333; a fixing ring 334 is arranged outside the avoidance hole 331;

the outer side wall of the fixing projection 333 is tightly attached to the inner wall of the first water-proof ring 16, the inner wall of the second water-proof ring 17 is tightly attached to the inner wall of the fixing ring 334, and the outer wall of the upper end near end of the purified water pipe 34 is tightly attached to the inner wall of the third water-proof ring 18.

Taking fig. 2 and 3 as an example, arrows in fig. 2 and 3 indicate the flow direction of water flow, and when the RO membrane filtration module 3 produces water normally, pure water enters the pure water channel from the pure water inlet 13 and then enters the RO membrane module 31 from the bottom surface of the RO membrane module 31; the RO membrane module 31 filters pure water into pure water and wastewater, and the pure water flows to the water collecting pipe 32 and enters the pure water channel; the purified water is discharged to a purified water waterway in the waterway system through the purified water outlet 14; and wastewater is discharged from the top surface of the RO membrane module 31 and flows through the wastewater port 332 to the wastewater channel and is discharged through the wastewater outlet 15 to the wastewater waterway in the waterway system.

Through the mutual cooperation of the fixing convex block 333 and the first water-proof ring 16, and the mutual cooperation of the second water-proof ring 17 and the fixing ring 334, the problems of water leakage at the joint between the upper cover 33 of the filter assembly and the first water-proof ring 16 and at the joint between the upper cover 33 of the filter assembly and the second water-proof ring 17 can be avoided, and the problem of water leakage of the composite RO membrane filter core is further prevented.

Optionally, the inner wall of the filter assembly upper cover 33 is provided with a support ring 335; the support ring 335 abuts against the top surface of the RO membrane module 31, and the inner wall of the support ring 335 abuts against the outer wall at the proximal end of the upper end of the water collecting pipe 32;

the outer wall of the support ring 335, the inner wall of the filter assembly upper cover 33 and the top surface of the RO membrane assembly 31 form a receiving space for the outflow of wastewater.

With such a structure, an accommodating space is formed between the top surface of the RO membrane module 31 and the upper cover 33 of the filter module, so that the wastewater in the RO membrane module 31 can be smoothly discharged. Meanwhile, the inner wall of the support ring 335 is tightly attached to the outer wall at the proximal end of the upper end of the water collecting pipe 32, so that the wastewater can be prevented from entering the pure water channel through the assembly gap between the support ring 335 and the water collecting pipe 32, and the problem of water leakage can be avoided.

Specifically, the outer side wall of the fixing projection 333, the inner wall of the fixing ring 334, the outer wall at the proximal end of the upper end of the clear water pipe 34 and the outer wall at the proximal end of the upper end of the water collecting pipe 32 are respectively provided with a first check valve 4.

The first check valve 4 plays a role in preventing water leakage, avoids the problem of water leakage at the joint of the fixing lug 333 and the first water-proof ring 16, the joint of the second water-proof ring 17 and the fixing ring 334, the joint of the purified water pipe 34 and the third water-proof ring 18 or the joint of the water collecting pipe 32 and the support ring 335, and further prevents the problem of water leakage of the composite RO membrane filter element.

Specifically, the primary filter module 2 comprises a primary filter upper cover 21, a filter flask 22, and a primary filter assembly 23 and a lower cover 24 arranged in the filter flask 22;

the primary filtering upper cover 21 is arranged at the upper end of the filter flask 22, and the primary filtering upper cover 21 is provided with a first through hole 211 and a raw water inlet 212 for raw water to enter; the bottom surface of the filter flask 22 is provided with a water purification through hole 221 communicated with the second through hole 241; the top surface of the filter bottle 22 tightly abuts against the filter component upper cover 33, and a primary filter gap exists between the filter bottle 22 and the primary filter component 23;

the upper end of the primary filter assembly 23 is inserted into the primary filter upper cover 21, and the lower end of the primary filter assembly 23 is inserted into the lower cover 24; the lower cover 24 is inserted into the inner bottom surface of the filter bottle 22 and is provided with a second through hole 241; the lower end of the water purifying pipe 34 is inserted into the second through hole 241; the upper end of the purified water pipe 34 passes through the first through hole 211 and communicates with the third water isolating ring 18.

In a specific embodiment, the primary filter assembly 23 may be one or more of a folded PP cotton, a carbon rod filter element, and a carbon fiber filter element, the inner wall of the primary filter assembly 23 is a water inlet end, and the outer wall of the primary filter assembly 23 is a water outlet end. Raw water enters the primary filter assembly 23 from the raw water port 212 and flows out of the outer wall of the primary filter assembly 23, and the raw water is converted into primary filter water; the primary filtered water passes through the primary filter gap and is then discharged from the primary filter outlet 12.

Further, a primary filtering water-isolating ring 19 is further arranged between the second water-isolating ring 17 and the third water-isolating ring 18 of the housing 1, and a blocking ring 213 is arranged outside the raw water port 212; the inner wall of the primary filtering water-proof ring 19 is tightly attached to the inner wall of the isolating ring 213;

a space between the inner wall of the second water-proof ring 17, the inner wall of the shell 1, the outer wall of the primary filtering water-proof ring 19 and the top surface of the primary filtering upper cover 21, and a gap between the filter flask 22 and the primary filtering component 23 form a primary filtering channel, and the primary filtering channel is communicated with the primary filtering water outlet 12;

the space between the outer wall of the third water-proof ring 18, the outer wall of the water collecting pipe 32, the inner wall of the shell 1 and the inner wall of the primary filtering water-proof ring 19 forms a raw water channel, and the raw water channel is communicated with the raw water inlet 11.

The second water-proof ring 17, the primary filtering water-proof ring 19, the third water-proof ring 18, the partition ring 213, the water collecting pipe 32 and the primary filtering upper cover 21 are mutually matched to separate the filter flask 22 into a primary filtering channel and a raw water channel, so as to play a role in separating primary filtering water and raw water, thereby avoiding the water mixing phenomenon between the primary filtering water and the raw water.

Taking fig. 4 to 6 as an example, arrows in fig. 4 to 6 indicate the flow direction of water flow, when the primary filter module 2 produces water normally, raw water enters the raw water channel from the raw water inlet 11; raw water enters the inner wall of the primary filter assembly 23 through the raw water port 212 and flows out of the outer wall of the primary filter assembly 23, and the raw water is converted into primary filter water; the primary filtered water enters the primary filter passage through the primary filter gap and is then discharged from the primary filter outlet 12.

Further, the outer walls of the filter bottle 22 at the upper end proximal end, the partition ring 213 and the water collecting pipe 32 at the lower end proximal end are respectively provided with a second check valve 5. The structure of second check valve 5 is the same with first check valve 4, and second check valve 5 plays the effect that prevents to leak equally, avoids the problem that the junction appears leaking, further prevents that compound RO membrane filter core from taking place the problem of shunk.

Preferably, the composite RO membrane filter cartridge further comprises a post-filtration module 6, wherein the post-filtration module 6 is disposed in the pure water channel, and the water outlet end of the post-filtration module 6 is communicated with the pure water through hole 221. In a specific embodiment, the post-filter module 6 may be a carbon rod filter element or a carbon fiber filter element, and the post-filter module 6 may adsorb organic substances in the purified water, so as to improve the taste of the purified water.

The technical principle of the present invention is described above with reference to specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be construed in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without inventive efforts, and such equivalent modifications or substitutions are intended to be included within the scope of the present invention as defined in the appended claims.

Claims (9)

1. The utility model provides a compound RO membrane filter core, is applied to the waterway system of water purifier which characterized in that: the composite RO membrane filter element comprises a shell, a primary filtering module and an RO membrane filtering module which are not communicated with each other; the RO membrane filtering module is arranged on the shell and comprises an RO membrane module and a water collecting pipe; the RO membrane assembly is sleeved on the outer side of the water collecting pipe and communicated with the water collecting pipe; the primary filtering module is arranged in the water collecting pipe;

a raw water inlet, a primary filtering water outlet, a pure water inlet, a pure water outlet and a waste water outlet are formed in the outer side of the shell; the raw water inlet is communicated with the water inlet end of the primary filtering module, and the primary filtering water outlet is communicated with the water outlet end of the primary filtering module; the pure water inlet is communicated with the water inlet end of the RO membrane filtering module, the pure water outlet is communicated with the pure water outlet end of the RO membrane filtering module, and the wastewater outlet is communicated with the wastewater outlet end of the RO membrane filtering module.

2. A composite RO membrane cartridge according to claim 1 wherein: the first water-proof ring, the second water-proof ring and the third water-proof ring are sequentially arranged inside the shell from outside to inside; the RO membrane filtration module also comprises a filtration assembly upper cover and a purified water pipe;

the upper cover of the filtering component is arranged at the wastewater outlet end of the RO membrane component, and the upper cover of the filtering component is provided with an avoidance hole and a wastewater hole; the axis of the avoidance hole is superposed with the axis of the upper cover of the filtering assembly, and the waste water hole is circumferentially arranged by taking the axis of the avoidance hole as a center; the water purifying pipe is arranged in the water collecting pipe, and the primary filtering module is sleeved on the outer side of the water purifying pipe; the avoidance hole provides an avoidance space for the primary filtering module;

a pure water channel is formed in a space between the inner wall of the shell, the outer wall of the first water-isolating ring, the outer wall of the upper cover of the filtering assembly and the outer wall of the RO membrane assembly, and the raw water inlet is communicated with the pure water channel;

a space between the outer wall of the upper cover of the filtering component, the inner wall of the first water-proof ring and the outer wall of the second water-proof ring forms a wastewater channel; one end of the waste water channel is communicated with the waste water hole, and the other end of the waste water channel is communicated with the waste water outlet;

a water purification channel is formed in a space among the inner wall of the water collecting pipe, the outer wall of the primary filtering module, the inner wall of the water purifying pipe and the inner wall of the third water-isolating ring; the water purification channel is communicated with the water purification water outlet.

3. A composite RO membrane cartridge according to claim 2 wherein: the top surface of the upper cover of the filtering component is provided with a fixed lug, and the avoidance hole and the waste water hole are respectively arranged on the fixed lug; a fixing ring is arranged on the outer side of the avoidance hole;

the outer side wall of the fixing lug is tightly attached to the inner wall of the first water-proof ring, the inner wall of the second water-proof ring is tightly attached to the inner wall of the fixing ring, and the outer wall of the near end of the upper end of the water purifying pipe is tightly attached to the inner wall of the third water-proof ring.

4. A composite RO membrane cartridge according to claim 3 wherein: the inner wall of the upper cover of the filter assembly is provided with a support ring; the support ring is abutted against the top surface of the RO membrane assembly, and the inner wall of the support ring is tightly attached to the outer wall at the proximal end of the upper end of the water collecting pipe;

and the outer wall of the support ring, the inner wall of the upper cover of the filtering assembly and the top surface of the RO membrane assembly form an accommodating space for the outflow of wastewater.

5. A composite RO membrane cartridge according to claim 4, characterized in that: the outer wall of the outer side wall of the fixed lug, the inner wall of the fixed ring, the outer wall of the upper end near end of the water purifying pipe and the outer wall of the upper end near end of the water collecting pipe are respectively provided with a first check valve.

6. A composite RO membrane cartridge according to claim 2 wherein: the primary filtering module comprises a primary filtering upper cover, a filter flask, a primary filtering assembly and a lower cover, wherein the primary filtering assembly and the lower cover are arranged in the filter flask;

the primary filtering upper cover is arranged at the upper end of the filter flask and is provided with a first through hole and a raw water inlet for raw water to enter; the bottom surface of the filter bottle is provided with a filter; the top surface of the filter bottle is tightly abutted against the upper cover of the filter component, and a primary filter gap is formed between the filter bottle and the primary filter component;

the upper end of the primary filter assembly is inserted into the primary filter upper cover, and the lower end of the primary filter assembly is inserted into the lower cover; the lower cover is inserted into the inner bottom surface of the filter flask and is provided with a second through hole communicated with the water purifying through hole; the lower end of the water purifying pipe is inserted into the second through hole; the upper end of the water purifying pipe penetrates through the first through hole and is communicated with the third water isolating ring.

7. A composite RO membrane cartridge according to claim 6 wherein: the shell is also provided with a primary filtering water isolating ring between the second water isolating ring and the third water isolating ring, and the outer side of the original water gap is provided with a blocking ring; the inner wall of the primary filtering water-proof ring is tightly attached to the inner wall of the isolating ring;

a space between the inner wall of the second water-isolating ring, the inner wall of the shell, the outer wall of the primary filtering water-isolating ring and the top surface of the primary filtering upper cover, and a gap between the filter bottle and the primary filtering component form a primary filtering channel, and the primary filtering channel is communicated with the primary filtering water outlet;

the space between the outer wall of third water proof ring, the outer wall of collector pipe, the inner wall of casing and the inner wall of preliminary filtration water proof ring forms the raw water passageway, the raw water passageway with raw water inlet intercommunication.

8. A composite RO membrane cartridge according to claim 7 wherein: and the near end of the upper end of the filter bottle, the outer wall of the partition ring and the near end of the lower end of the water collecting pipe are respectively provided with a second check valve.

9. A composite RO membrane cartridge according to claim 6 wherein: the composite RO membrane filter element further comprises a post-filtration module, the post-filtration module is arranged in the pure water channel, and the water outlet end of the post-filtration module is communicated with the pure water through hole.

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