CN215946919U - 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 first filtering module and a second filtering module; the shell is internally provided with a raw water cavity, and the first filtering module and the second filtering module are respectively arranged in the raw water cavity. The composite RO membrane filter element integrates the first filter module and the second 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, be provided with the partition subassembly, through the cooperation of separating subassembly, inner shell and shell for independent operation and each other not communicate between RO membrane filter core and the rearmounted filter core in first filter module and the second filter module, avoid the emergence of the phenomenon of crossing water.

Description

Composite RO (reverse osmosis) membrane filter element

Technical Field

The utility model relates to the field of filter elements, in particular to a composite RO membrane filter element.

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 up water purification equipment at home to filter the tap water.

The existing water purifying equipment generally comprises an activated carbon filter element, a PP cotton filter element and an RO membrane filter element, wherein the carbon filter element, the PP cotton filter element and the RO membrane filter element are connected in series on a water pipe to solve the problem of comprehensive filtration of impurities in water. However, the activated carbon filter element, the PP cotton filter element and the RO membrane filter element are respectively arranged, and a plurality of filter bottles are arranged below the kitchen basin, so that a plurality of filter bottles occupy more storage space of a kitchen.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a composite RO membrane filter element to solve the problem that the filter element of the water purifying equipment occupies too much space.

In order to achieve the purpose, the utility model adopts the following technical scheme:

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 first filtering module and a second filtering module;

a raw water cavity is formed in the shell, and the first filtering module and the second filtering module are respectively arranged in the raw water cavity;

the second filtering module comprises an inner shell, an inner cover, an RO membrane filter element and a separation assembly, wherein the RO membrane filter element and the separation assembly are arranged in the inner shell; the upper end of the inner shell is communicated with the water outlet end of the first filtering module, the inner cover is arranged at the lower end of the inner shell, and the inner cover is provided with a water discharge pipe;

the RO membrane filter element is used for filtering the initial filter water discharged by the first filtering module;

the separation assembly is matched with the inner shell to separate the wastewater and the pure water filtered by the RO membrane filter element, the pure water is discharged through the pure water outlet end of the separation assembly, and the wastewater is discharged through the drain pipe;

the separation subassembly is equipped with rearmounted filter core, rearmounted filter core is used for filtering the pure water.

In the composite RO membrane filter element, the separation component is provided with a pure water flow passage; the pure water flow channel is communicated with a pure water outlet end of the RO membrane filter element; the post-filter element is arranged in the pure water flow passage;

the outer wall of the separation assembly is matched with the inner wall of the inner shell and the inner wall of the inner cover to form a wastewater channel; one end of the wastewater channel is communicated with a wastewater outlet end of the RO membrane filter element, and the other end of the wastewater channel is communicated with a drain pipe;

the pure water flow passage is not communicated with the waste water flow passage.

In the composite RO membrane filter element, the separation assembly comprises a separation seat, a mounting cover and a separation pipe;

the upper end of the separation seat is provided with an installation groove, and the lower end of the RO membrane filter element is sleeved in the installation groove;

the lower end of the separating seat is provided with a sleeve; the mounting cover is sleeved at the opening of the sleeve;

the upper end of the separation pipe is communicated with the mounting cover, and the lower end of the separation pipe extends out of the drain pipe;

the inner wall of the sleeve, the inner wall of the mounting cover and the inner wall of the separating pipe are matched to form a pure water flow channel; the lower end of the rear filtering element is sleeved on the inner wall of the mounting cover, and the water outlet end of the rear filtering element is communicated with the mounting cover.

In the composite RO membrane filter element, a pure water inlet is formed in the bottom of the mounting groove, and the lower end of the RO membrane filter element is communicated with a pure water flow channel through the pure water inlet;

the partition seat is provided with a plurality of waste water holes along the circumferential direction of the outer side of the sleeve, the waste water holes are communicated with the mounting groove, and the waste water outlet end of the RO membrane filter element is communicated with a waste water flow channel through the waste water holes.

In the composite RO membrane filter element, the RO membrane filter element comprises a water collecting pipe and a filter membrane structure;

the filter membrane structure is sleeved on the periphery of the water collecting pipe, and the interior of the filter membrane structure is communicated with the side wall of the water collecting pipe;

one end of the water collecting pipe is communicated with the pure water inlet, and a water plugging block and a pure water one-way valve are arranged in the water collecting pipe;

the pure water one-way valve is arranged at the near end of one end of the water collecting pipe and is used for limiting the flow direction of pure water; the water blocking block is arranged at the near end of the other end of the water collecting pipe and is used for isolating pure water and primary filtered water.

In the composite RO membrane filter element, the separation pipe comprises a baffle part and a water pipe part; a baffle plate groove is recessed in the periphery of the joint of the inner cover and the drain pipe, and the baffle plate groove is matched with the baffle plate;

the baffle part, the baffle groove and the outer wall of the water pipe part are matched to form a waste water cavity; the baffle part is provided with a waste water port, and the waste water port is provided with a waste water one-way valve; the waste water cavity is communicated with a drain pipe and is communicated with a waste water runner through the waste water opening;

the upper end of the water pipe part is communicated with the mounting cover, and the lower end of the water pipe part penetrates through the baffle part and extends out of the drain pipe.

In the composite RO membrane filter element, the shell is provided with a water inlet which is arranged on the outer side of the drain pipe;

a check block is arranged on the outer side of the drain pipe, and an inner cover groove matched with the check block is arranged on the periphery of the water inlet;

the check block, the inner cover groove and the outer wall of the separation pipe are matched to form a water inlet cavity, the check block is provided with a raw water port, and the raw water port is provided with a raw water one-way valve;

the water inlet cavity is communicated with the raw water cavity through the raw water port.

In the compound RO membrane filter core, the other end of rearmounted filter core is equipped with rearmounted sealed lid, rearmounted sealed lid is used for separating the pure water with the water purification that rearmounted filter core filters off.

In the composite RO membrane filter element, one end of the first filter module is inserted into one end of the inner shell, and the other end of the first filter module is provided with a front sealing cover which is used for separating raw water and primary filter water;

the first filtering module comprises a folding PP cotton filter element and a front activated carbon filter element; the folding PP cotton filter element is sleeved on the outer side of the front active carbon filter element;

the front activated carbon filter element is provided with a scale inhibition layer, and the scale inhibition layer is loaded with a scale inhibitor.

In the compound RO membrane filter core, rearmounted filter core includes rearmounted active carbon filter core and antibacterial cotton, the antibacterial cotton parcel is in the outside of rearmounted active carbon filter core.

One technical scheme in the utility model can have the following beneficial effects:

the first filtering module and the second filtering module are integrated together by the composite RO membrane filter element, so that the number of the whole filter elements in the water purifier is reduced, the space inside the water purifier is saved, and the problem of large occupied space of the water purifier is solved. And, be provided with the partition subassembly, through the cooperation of separating subassembly, inner shell and shell for independent operation and each other not communicate between RO membrane filter core and the rearmounted filter core in first filter module and the second filter module, avoid the emergence of the phenomenon of crossing water.

Drawings

FIG. 1 is a schematic illustration of an explosive structure in accordance with one embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view of one embodiment of the present invention;

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

FIG. 4 is a perspective view of a divider base according to one embodiment of the present invention;

FIG. 5 is a schematic perspective view of the inner lid in one embodiment of the present invention;

FIG. 6 is a schematic perspective view of the other side of the inner cover in one embodiment of the present invention;

FIG. 7 is a schematic diagram of the construction of a spacer tube in accordance with one embodiment of the present invention;

in the drawings: the filter comprises a shell 1 and a first filter module 2;

a raw water cavity 11, a water inlet 12 and a water inlet cavity 13; a folding PP cotton filter element 21, a front activated carbon filter element 22 and a front sealing cover 23; an inner shell 31, an inner cover 32, an RO membrane filter element 33 and a post-filter element 35; a pure water flow path 36, a wastewater flow path 37;

an inner cap recess 111; a drain pipe 321, a baffle groove 322, a grid block 323; a water collection pipe 331, a filter membrane structure 332; a separation base 341, a mounting cover 342, a separation tube 343; mounting groove 344, sleeve 345; a rear active carbon filter element 351, bacteriostatic cotton 352 and a rear sealing cover 353;

a raw water port 3231, a raw water check valve 3232; a water block 3311, a pure water check valve 3312; a pure water inlet 3411, a waste water hole 3412; a baffle portion 3431, a water pipe portion 3432; a waste water port 3433, a waste water check valve 3434 and a waste water chamber 3435.

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 or similar 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 accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to 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 used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to 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, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; 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 meanings 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 7, the present invention provides a composite RO membrane filter element applied to a waterway system of a water purifier, the composite RO membrane filter element includes a housing 1, a first filter module 2 and a second filter module;

a raw water cavity 11 is arranged in the shell 1, and the first filtering module 2 and the second filtering module are respectively arranged in the raw water cavity 11;

the second filtering module comprises an inner shell 31, an inner cover 32, an RO membrane filter element 33 arranged in the inner shell 31 and a separation component; the upper end of the inner shell 31 is communicated with the water outlet end of the first filtering module 2, the inner cover 32 is arranged at the lower end of the inner shell 31, and the inner cover 32 is provided with a water outlet pipe 321;

the RO membrane filter element 33 is used for filtering the initial filter water discharged by the first filtering module 2;

the separation component is matched with the inner shell 31 to separate the wastewater filtered by the RO membrane filter element 33 from the pure water, the pure water is discharged through the pure water outlet end of the separation component, and the wastewater is discharged through the water discharge pipe 321;

a post-filtration filter element 35 is arranged in the separation assembly, and the post-filtration filter element 35 is used for filtering pure water.

The first filtering module 2 and the second filtering module are integrated together by the composite RO membrane filter element, so that the number of the whole filter elements in the water purifier is reduced, the space inside the water purifier is saved, and the problem of large occupied space of the water purifier is solved. Moreover, the separation assembly is arranged, and the RO membrane filter element 33 and the rear filter element 35 in the first filter module 2 and the second filter module are independently operated and are not communicated with each other through the matching of the separation assembly, the inner shell 31 and the outer shell 1, so that the water leakage phenomenon is avoided.

Raw water refers to unfiltered water in a waterway system. When normal system water, raw water in the waterway system enters into the raw water cavity 11 to be primarily filtered through the first filtering module 2. The first filtering module 2 filters the raw water into primary filtered water, and the primary filtered water enters an RO membrane filter element 33 in the second filtering module; the RO membrane cartridge 33 filters the primary filtered water into pure water and produces wastewater.

The pure water enters the post-filter element 35 and is filtered into pure water, and the pure water flows to a pure water waterway in the waterway system through the separation component; and the wastewater generated by the RO membrane filter element 33 is discharged to the wastewater waterway of the waterway system through the drain pipe 321, so as to avoid the water mixing phenomenon between the wastewater and the pure water.

The post-filter element 35 can adsorb organic matters in the purified water, and the taste of the purified water is improved.

In a preferred embodiment of the present invention, the inner wall of the inner shell 31 is provided with a support rib for fixing the RO membrane cartridge 33, so as to avoid the problem of water leakage caused by loosening of the RO membrane cartridge 33.

Specifically, the partition member is provided with a pure water flow passage 36; the pure water flow channel 36 is communicated with a pure water outlet end of the RO membrane filter element 33; the post-filter element 35 is arranged in the pure water flow passage 36;

the outer wall of the separation component is matched with the inner wall of the inner shell 31 and the inner wall of the inner cover 32 to form a waste water flow channel 37; one end of the wastewater channel 37 is communicated with the wastewater outlet end of the RO membrane filter element 33, and the other end of the wastewater channel 37 is communicated with the drain pipe 321;

the pure water passage 36 and the waste water passage 37 are not communicated with each other.

The partition assembly forms a waste water flow passage 37 by being matched with the inner wall of the inner shell 31 and the inner wall of the inner cover 32; the wastewater generated by the filtration in the RO membrane cartridge 33 is discharged to the outside of the composite RO membrane cartridge through the wastewater channel 37. And the pure water filtered by the RO membrane filter element 33 directly enters the pure water flow passage 36, is filtered by the post-filter element 35 and then is discharged to the outside of the composite RO membrane filter element.

The purpose of separating the wastewater and the pure water is achieved by the pure water flow passage 36 and the wastewater flow passage 37.

Further, the partition assembly includes a partition seat 341, a mounting cover 342, and a partition pipe 343;

the upper end of the separation seat 341 is provided with an installation groove 344, and the lower end of the RO membrane cartridge 33 is sleeved in the installation groove 344;

the lower end of the separation seat 341 is provided with a sleeve 345; the mounting cover 342 is sleeved at the opening of the sleeve 345;

the upper end of the separation pipe 343 is communicated with the mounting cap 342, and the lower end of the separation pipe 343 extends from the drain pipe 321;

the inner wall of the sleeve 345, the inner wall of the mounting cap 342 and the inner wall of the separation pipe 343 cooperate to form a pure water flow passage 36; the lower end of the rear filter element 35 is sleeved on the inner wall of the mounting cover 342, and the water outlet end of the rear filter element 35 is communicated with the mounting cover 342.

The partition seat 341 partitions the inside of the inner case 31 into two regions of a water inlet region and a water discharge region; the RO membrane filter element 33 is arranged in the water inlet area; the initial filtered water enters the water inlet area and then enters the RO membrane filter element 33 for filtering; a pure water flow path 36 and a wastewater flow path 37 are provided in the drain region, pure water generated from the RO membrane cartridge 33 is introduced into the pure water flow path 36 and filtered by the post-filter cartridge 35, and wastewater is introduced into the wastewater flow path 37. In the whole process, the initial filtered water, the pure water and the wastewater can not be contacted and mixed, so that the problem of water mixing is avoided.

Furthermore, a pure water inlet 3411 is provided at the bottom of the installation groove 344, and the lower end of the RO membrane filter element 33 is communicated with the pure water flow passage 36 through the pure water inlet 3411;

the partition seat 341 is provided with a plurality of waste water holes 3412 along the outer circumference of the sleeve 345, the waste water holes 3412 are communicated with the installation groove 344, and the waste water outlet end of the RO membrane filter element 33 is communicated with the waste water channel 37 through the waste water holes 3412.

Referring to fig. 2 to 4, the separation base 341 separates the primary filtered water from the pure water and the wastewater discharged from the RO membrane filter 33; and pure water and waste water are separated by the cooperation of the sleeve 345, the mounting cap 342 and the separation tube 343. With the above structure, the wastewater generated by the RO membrane filter element 33 is collected in the installation groove 344, and then enters the wastewater channel 37 through the wastewater hole 3412, and the pure water generated by the RO membrane filter element 33 is communicated with the pure water channel 36 through the pure water inlet 3411, so that the problem of water mixing caused by mixing of the pure water and the wastewater is avoided.

Specifically, the RO membrane cartridge 33 includes a water collection pipe 331 and a filter membrane structure 332;

the filter membrane structure 332 is sleeved on the periphery of the water collecting pipe 331, and the interior of the filter membrane structure 332 is communicated with the side wall of the water collecting pipe 331;

one end of the water collecting pipe 331 is communicated with the pure water inlet 3411, and a water blocking block 3311 and a pure water one-way valve 3312 are arranged in the water collecting pipe 331;

the pure water check valve 3312 is disposed at a proximal end of one end of the water collecting pipe 331, and the pure water check valve 3312 serves to define a flow direction of pure water; the water blocking block 3311 is disposed at the proximal end of the other end of the water collecting pipe 331, and is used for isolating pure water and primary filtered water.

Referring to fig. 2 to 4, the filtering method of the RO membrane filter element 33 can refer to the conventional RO membrane reverse osmosis filter element, as shown in fig. 2, an arrow indicates the flow direction of water, the water inlet end of the RO membrane filter element 33 is the upper end of the filter membrane structure 332, the lower end of the filter membrane structure 332 is the wastewater outlet end of the RO membrane filter element 33, and the lower end of the water collecting pipe 331 is the pure water outlet end of the RO membrane filter element 33. The prefiltered water enters from the upper end of the RO membrane cartridge 33, and then, the pure water enters the water collecting pipe 331 from the inner wall of the membrane structure 332, and then flows from the pure water inlet 3411 to the pure water flow passage 36 through the water collecting pipe 331. And the wastewater flows out from the lower end of the RO membrane cartridge 33, is collected in the mounting groove 344, and enters the wastewater channel 37 through the wastewater hole 3412.

The water block 3311 plays a role of isolating pure water and primary filtered water, preventing the primary filtered water from entering from the upper end of the water collecting pipe 331, resulting in mixing of the primary filtered water with the pure water, and causing the problem of water cross.

The pure water check valve 3312 restricts the flow direction of pure water to prevent pure water in the pure water flow passage 36 from reversely flowing into the water collection pipe 331.

Specifically, the partition pipe 343 includes a baffle portion 3431 and a water pipe portion 3432; a baffle groove 322 is recessed at the periphery of the joint of the inner cover 32 and the water discharge pipe 321, and the baffle groove 322 is matched with the baffle part 3431;

the baffle part 3431, the baffle groove 322 and the outer wall of the water pipe part 3432 are matched to form a waste water cavity 3435; the baffle part 3431 is provided with a waste water port 3433, and the waste water port 3433 is provided with a waste water check valve 3434; the waste water cavity 3435 is communicated with the drain pipe 321, and the waste water cavity 3435 is communicated with the waste water channel 37 through the waste water port 3433;

the upper end of the water pipe portion 3432 communicates with the mounting cap 342, and the lower end of the water pipe portion 3432 passes through the barrier portion 3431 and extends from the drain pipe 321.

Referring to fig. 1, 3 and 7, the above structure is adopted, so that the waste water enters the waste water cavity 3435 through the waste water port 3433 and flows to the drain pipe 321 through the waste water cavity 3435, and the waste water port 3433 is provided with the waste water check valve 3434 to limit the flow direction of the waste water and prevent the waste water from flowing back to the waste water channel 37 from the drain pipe 321.

Specifically, the outer shell 1 is provided with a water inlet 12, and the water inlet 12 is arranged outside the water discharge pipe 321;

a check block 323 is arranged on the outer side of the water outlet pipe 321, and an inner cover groove 111 matched with the check block 323 is arranged on the periphery of the water inlet 12;

the check block 323, the inner cover groove 111 and the outer wall of the separating pipe 343 are matched to form a water inlet cavity 13, the check block 323 is provided with a raw water port 3231, and the raw water port 3231 is provided with a raw water one-way valve 3232;

the water inlet cavity 13 is communicated with the raw water cavity 11 through the raw water port 3231.

Referring to fig. 1, 3, 5 and 6, with the above-described structure, after flowing into the water inlet chamber 13, the raw water enters the raw water chamber 11 through the raw water port 3231, and the raw water port 3231 is provided with the raw water check valve 3232, so that the flow direction of the raw water is limited, and the problem of backflow of the raw water is avoided.

Specifically, the other end of the post-filter element 35 is provided with a post-seal cover 353, and the post-seal cover 353 is used for separating pure water from the pure water filtered by the post-filter element 35.

Referring to fig. 1 and 2, the post-filter element 35 can be referred to a conventional filter element, and pure water enters from a side wall of the post-filter element 35, is filtered into pure water by the post-filter element 35, and flows out from a middle portion of the post-filter element 35. Adopt above-mentioned structure, prevent that the pure water from getting into and post-positioned filter core 35 inner wall from post-positioned filter core 35's upper end to mix with the pure water, lead to post-positioned filter core 35's filtration quality to reduce.

Specifically, one end of the first filtering module 2 is inserted into one end of the inner shell 31, the other end of the first filtering module 2 is provided with a front sealing cover 23, and the front sealing cover 23 is used for separating raw water and primary filtered water;

the first filtering module 2 comprises a folding PP cotton filter element 21 and a front activated carbon filter element 22; the folding PP cotton filter element 21 is sleeved on the outer side of the front active carbon filter element 22;

the front activated carbon filter element 22 is provided with a scale inhibition layer which is loaded with a scale inhibitor.

Referring to fig. 1 and 2, the first filtering module 2 may refer to a conventional filtering core, and raw water enters from a side wall of the first filtering module 2, is filtered by the first filtering module 2 to form primary filtered water, and flows from a middle portion of the first filtering module 2 to the second filtering module. Adopt above-mentioned structure, prevent that the raw water from getting into the middle part of first filtration module 2 from the upper end of first filtration module 2 to mix with the initial drainage, lead to the problem of appearing shui.

In one embodiment of the utility model, the first filter module 2 is composed of a combination of a coconut shell activated carbon filter element and a folded PP cotton filter element 21. Raw water firstly passes through the folding PP cotton filter element 21 to filter out larger impurities in the raw water, and then fine impurities in the raw water are adsorbed by the coconut shell activated carbon filter element. With such an arrangement, the service life of the RO membrane cartridge 33 can be prolonged.

In a preferred embodiment of the present invention, the pre-activated carbon filter 22 is provided with a scale inhibition layer, which is activated carbon loaded with FOF scale inhibitor. The scale inhibitor has the functions of dispersing the insoluble inorganic salt in water and preventing or interfering the precipitation and scaling of the insoluble inorganic salt on the metal surface, is suitable for raw water with high content of reverse osmosis barium and strontium, and effectively prevents scaling. So set up, can further avoid the scale deposit of RO membrane, prolong the life of RO membrane filter core 33.

Optionally, the rear filter element 35 includes a rear activated carbon filter element 351 and bacteriostatic cotton 352, and the bacteriostatic cotton 352 is wrapped outside the rear activated carbon filter element 351.

Adopt above-mentioned structure, realize adsorbing the organic matter in the pure water through rearmounted active carbon filter 351, improve the taste of pure water, afterwards, antibiotic deodorant purpose is realized to antibiotic cotton 352 of rethread. In one embodiment of the present invention, the post-activated carbon filter element 351 is a coconut shell activated carbon filter element.

The technical principle of the present invention is described above in connection with specific embodiments. The description is made for the purpose of illustrating the principles of the utility model and should not be construed in any way as limiting the scope of the utility model. Other embodiments of the utility model will occur to those skilled in the art without the exercise of inventive faculty based on the explanations herein, 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 (10)

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 first filtering module and a second filtering module;

a raw water cavity is formed in the shell, and the first filtering module and the second filtering module are respectively arranged in the raw water cavity;

the second filtering module comprises an inner shell, an inner cover, an RO membrane filter element and a separation assembly, wherein the RO membrane filter element and the separation assembly are arranged in the inner shell; the upper end of the inner shell is communicated with the water outlet end of the first filtering module, the inner cover is arranged at the lower end of the inner shell, and the inner cover is provided with a water discharge pipe;

the RO membrane filter element is used for filtering the initial filter water discharged by the first filtering module;

the separation assembly is matched with the inner shell to separate the wastewater and the pure water filtered by the RO membrane filter element, the pure water is discharged through the pure water outlet end of the separation assembly, and the wastewater is discharged through the drain pipe;

the separation subassembly is equipped with rearmounted filter core, rearmounted filter core is used for filtering the pure water.

2. A composite RO membrane cartridge according to claim 1 wherein: the separation component is provided with a pure water flow channel; the pure water flow channel is communicated with a pure water outlet end of the RO membrane filter element; the post-filter element is arranged in the pure water flow passage;

the outer wall of the separation assembly is matched with the inner wall of the inner shell and the inner wall of the inner cover to form a wastewater channel; one end of the wastewater channel is communicated with a wastewater outlet end of the RO membrane filter element, and the other end of the wastewater channel is communicated with a drain pipe;

the pure water flow passage is not communicated with the waste water flow passage.

3. A composite RO membrane cartridge according to claim 2 wherein: the separation assembly comprises a separation seat, a mounting cover and a separation pipe;

the upper end of the separation seat is provided with an installation groove, and the lower end of the RO membrane filter element is sleeved in the installation groove;

the lower end of the separating seat is provided with a sleeve; the mounting cover is sleeved at the opening of the sleeve;

the upper end of the separation pipe is communicated with the mounting cover, and the lower end of the separation pipe extends out of the drain pipe;

the inner wall of the sleeve, the inner wall of the mounting cover and the inner wall of the separating pipe are matched to form a pure water flow channel; the lower end of the rear filtering element is sleeved on the inner wall of the mounting cover, and the water outlet end of the rear filtering element is communicated with the mounting cover.

4. A composite RO membrane cartridge according to claim 3 wherein: the bottom of the mounting groove is provided with a pure water inlet, and the lower end of the RO membrane filter element is communicated with a pure water flow channel through the pure water inlet;

the partition seat is provided with a plurality of waste water holes along the circumferential direction of the outer side of the sleeve, the waste water holes are communicated with the mounting groove, and the waste water outlet end of the RO membrane filter element is communicated with a waste water flow channel through the waste water holes.

5. A composite RO membrane cartridge according to claim 4, characterized in that: the RO membrane filter element comprises a water collecting pipe and a filter membrane structure;

the filter membrane structure is sleeved on the periphery of the water collecting pipe, and the interior of the filter membrane structure is communicated with the side wall of the water collecting pipe;

one end of the water collecting pipe is communicated with the pure water inlet, and a water plugging block and a pure water one-way valve are arranged in the water collecting pipe;

the pure water one-way valve is arranged at the near end of one end of the water collecting pipe and is used for limiting the flow direction of pure water; the water blocking block is arranged at the near end of the other end of the water collecting pipe and is used for isolating pure water and primary filtered water.

6. A composite RO membrane cartridge according to claim 3 wherein: the separation pipe comprises a baffle part and a water pipe part; a baffle plate groove is recessed in the periphery of the joint of the inner cover and the drain pipe, and the baffle plate groove is matched with the baffle plate;

the baffle part, the baffle groove and the outer wall of the water pipe part are matched to form a waste water cavity; the baffle part is provided with a waste water port, and the waste water port is provided with a waste water one-way valve; the waste water cavity is communicated with a drain pipe and is communicated with a waste water runner through the waste water opening;

the upper end of the water pipe part is communicated with the mounting cover, and the lower end of the water pipe part penetrates through the baffle part and extends out of the drain pipe.

7. A composite RO membrane cartridge according to claim 3 wherein: the shell is provided with a water inlet which is arranged on the outer side of the drain pipe;

a check block is arranged on the outer side of the drain pipe, and an inner cover groove matched with the check block is arranged on the periphery of the water inlet;

the check block, the inner cover groove and the outer wall of the separation pipe are matched to form a water inlet cavity, the check block is provided with a raw water port, and the raw water port is provided with a raw water one-way valve;

the water inlet cavity is communicated with the raw water cavity through the raw water port.

8. A composite RO membrane cartridge according to claim 3 wherein: the other end of the post-filter element is provided with a post-sealing cover, and the post-sealing cover is used for separating pure water and pure water filtered by the post-filter element.

9. A composite RO membrane cartridge according to claim 1 wherein: one end of the first filtering module is inserted into one end of the inner shell, and the other end of the first filtering module is provided with a front sealing cover which is used for separating raw water and primary filtered water;

the first filtering module comprises a folding PP cotton filter element and a front activated carbon filter element; the folding PP cotton filter element is sleeved on the outer side of the front active carbon filter element;

the front activated carbon filter element is provided with a scale inhibition layer, and the scale inhibition layer is loaded with a scale inhibitor.

10. A composite RO membrane cartridge according to claim 1 wherein: the rear-mounted filter element comprises a rear-mounted activated carbon filter element and bacteriostatic cotton, and the bacteriostatic cotton is wrapped on the outer side of the rear-mounted activated carbon filter element.

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