CN215946920U

CN215946920U - Multistage filter core

Info

Publication number: CN215946920U
Application number: CN202122180081.6U
Authority: CN
Inventors: 胡兴亿; 缪虹娟; 韩小娟; 李志强
Original assignee: Foshan Shunde Yingfengtai Environmental Protection Technology Co ltd
Current assignee: Foshan Shunde Yingfengtai Environmental Protection Technology Co ltd
Priority date: 2021-09-09
Filing date: 2021-09-09
Publication date: 2022-03-04
Anticipated expiration: 2031-09-09

Abstract

The utility model discloses a multistage filtering filter element which comprises a shell, a first filtering module, an RO membrane filter element and a second filtering module, wherein the first filtering module is arranged in the shell; be equipped with former water cavity in the shell, first filtration module, RO membrane filter core and second filter module set up respectively in former water cavity, just RO membrane filter core and second filter module and former water cavity each other do not communicate. The multistage filter element is applied to the water path system of the water purifier, and the first filter module, the RO membrane filter element and the second filter module are integrated together, so that the number of the whole filter elements in the water purifier is reduced, the purpose of saving the space inside the water purifier is realized, and the problem of large occupied space of the water purifier is solved. The multi-stage filtration filter core is provided with the shunt tubes, separates the waste water and the pure water that the RO membrane filter core filtered out through pure water runner and waste water runner, avoids the emergence of cross-watering phenomenon.

Description

Multistage filter core

Technical Field

The utility model relates to the field of filter elements, in particular to a multistage filtering 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 activated 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 multi-stage filtering 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 multistage filtering filter element which comprises a shell, a first filtering module, an RO membrane filter element and a second filtering module, wherein the shell is provided with a first filtering module and a second filtering module;

a raw water cavity is formed in the shell, the first filtering module, the RO membrane filter element and the second filtering module are respectively arranged in the raw water cavity, and the RO membrane filter element and the second filtering module are not communicated with the raw water cavity;

a water filtering cavity is arranged inside the first filtering module, a water inlet cavity is arranged inside the second filtering module, the upper end of the RO membrane filter core is sleeved in the water filtering cavity, the lower end of the RO membrane filter core is sleeved in the water inlet cavity, and a flow dividing pipe is arranged at the lower end of the RO membrane filter core;

the flow dividing pipe is provided with a pure water flow passage and a waste water flow passage which are not communicated with each other; one end of the pure water flow channel is communicated with the pure water outlet end of the RO membrane filter element, and the other end of the pure water flow channel is communicated with the water inlet cavity; and the wastewater flow channel is communicated with a wastewater outlet end of the RO membrane filter element.

In the multistage filter element, the second filter module comprises an inner shell, a mounting sleeve, a post-positioned filter element and a separation pipe;

the mounting sleeve is sleeved on the outer side of the RO membrane filter element, a first mounting seat is arranged in the middle of the mounting sleeve, and a second mounting seat is arranged at the near end of the upper end of the mounting sleeve;

the lower end of the inner shell is connected with a drain pipe, and the upper end of the inner shell is mounted on the first mounting seat; the lower end of the first filtering module is mounted on the second mounting seat;

the water inlet cavity is arranged in the middle of the rear filter element, and the other end of the RO membrane filter element is sleeved in the rear filter element; the rear filter element is arranged in the inner shell, the upper end of the rear filter element is fixed on the first mounting seat, and the lower end of the rear filter element is fixed on the separation pipe;

the upper end of the separation pipe is communicated with the wastewater channel, and the lower end of the separation pipe extends out of the drain pipe.

In the multistage filter element, the separation pipe comprises a base part, a baffle part and a water pipe part; a baffle concave cavity is recessed at the periphery of the joint of the inner shell and the drain pipe;

the lower end of the rear filter element is fixed on the base part, a plurality of support bars are axially arranged on the bottom surface of the base part, and the support bars tightly abut against the outer edge of the baffle concave cavity;

the upper end of the water pipe part is communicated with the base part, and the lower end of the water pipe part extends out of the drain pipe; a waste water one-way valve is arranged in the water pipe part;

the baffle part is arranged on the outer side of the water pipe part;

the baffle part, the baffle concave cavity, the outer wall of the water pipe part and the inner wall of the water drain pipe are matched to form a purified water flow passage; the inner wall of the inner shell, the outer side wall of the rear filter element, the first mounting seat and the base part are matched to form a water purifying cavity;

the baffle part is provided with a water purifying port, and the water purifying port is provided with a water purifying one-way valve; the water purification runner is communicated with the water purification cavity through the water purification port.

In the multistage 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 is formed in the inner wall of the shell and is recessed in the periphery of the water inlet;

the check block, the inner cover groove and the outer wall of the drain pipe are matched to form a raw 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 raw water inlet cavity is communicated with the raw water cavity through the raw water port.

In the multi-stage filtering filter element, the flow dividing pipe comprises a pipe body and a blocking ring;

the pure water flow passage and the waste water flow passage are respectively arranged in the pipe body, and the pure water flow passage comprises a pure water flow passage inlet and a pure water flow passage outlet; the wastewater channel comprises a wastewater channel inlet and a wastewater channel outlet; the pure water flow passage inlet is arranged at the upper end of the pipe body, and the pure water flow passage outlet is arranged on the left side wall of the pipe body; the waste water runner inlet is arranged on the right side wall of the pipe body, and the waste water runner outlet is arranged at the lower end of the pipe body;

the blocking ring is sleeved on the outer side of the pipe body and is located between the pure water runner outlet and the wastewater runner inlet.

In the multi-stage filtration filter element, the RO membrane filter element comprises a sealing cover, a water collecting pipe and a filter membrane structure;

the sealing cover is arranged at the lower end of the filter membrane structure and is provided with a water outlet pipe; the blocking ring is embedded in the water outlet pipe;

the lower end of the pipe body extends out of the sealing cover, and the outlet of the pure water flow passage is communicated with the water inlet cavity; the outlet of the waste water runner is communicated with the water pipe part; the inlet of the wastewater flow channel is communicated with the wastewater outlet end of the filter membrane structure;

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

and a water plugging block is arranged at the near end of the upper end of the water collecting pipe.

In the multi-stage filtration filter element, the upper end of the first filtration module is provided with a front sealing cover, and the front sealing cover is used for separating raw water and primary filtration water.

In the multistage filtering filter element, 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 outside the front active carbon filter element;

and a scale inhibition layer is arranged in the front activated carbon filter element, and a scale inhibitor is loaded on the scale inhibition layer.

Among the multiple-stage filtration filter core, rearmounted filter core includes rearmounted active carbon filter core and aseptic non-woven fabrics, aseptic non-woven fabrics 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 multi-stage filtration filter element is applied to the water route system of water purifier, and is integrated together through filtering module, RO membrane filter core and second with first filtration module to reduce the quantity of whole filter core in the purifier, realize the purpose of saving the inside space of purifier, solve the purifier and have the problem that occupation space is big. The multi-stage filtration filter core is provided with the shunt tubes, separates the waste water and the pure water that the RO membrane filter core filtered out through pure water runner and waste water runner, avoids the emergence of cross-watering phenomenon.

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 schematic structural view of an inner shell according to one embodiment of the present invention;

FIG. 5 is a schematic view of the internal structure of the inner case according to one embodiment of the present invention;

FIG. 6 is a schematic diagram of the structure of a separation tube in one embodiment of the present invention;

fig. 7 is a schematic view of a shunt tube according to one embodiment of the present invention;

in the drawings: the device comprises a shell 1, a first filtering module 2, an RO membrane filter element 3, a second filtering module 4, a flow dividing pipe 5, a purified water flow passage 6, a purified water cavity 7 and a raw water inlet cavity 8;

a raw water cavity 11, a water inlet 12 and an inner cover groove 13; a folding PP cotton filter element 21 and a front activated carbon filter element 22; a front seal cover 23; a sealing cover 31, a water collecting pipe 32, a filter membrane structure 33 and a water blocking block 34; an inner shell 41, a mounting sleeve 42, a rear filter element 43, a separating pipe 44 and a water inlet cavity 45; a tube body 51, a blocking ring 52; a pure water flow path inlet 53, a pure water flow path outlet 54; a waste water runner inlet 55, a waste water runner outlet 56;

a water filtering chamber 211; a water outlet pipe 311; a drain pipe 411, a baffle cavity 412, a grid block 413, a raw water port 414 and a raw water one-way valve 415; a first mounting seat 421 and a second mounting seat 422; a rear active carbon filter core 431 and a sterile non-woven fabric 432; the base portion 441, the baffle portion 442, the water pipe portion 443; a pure water flow path 511 and a wastewater flow path 512;

a support bar 4411, a waste water check valve 4431; a water purifying port 4421 and a water purifying one-way valve 4422.

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", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the 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 thus, 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, "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 multi-stage filtration cartridge, which includes a housing 1, a first filtration module 2, an RO membrane cartridge 3, and a second filtration module 4;

a raw water cavity 11 is arranged in the shell 1, the first filtering module 2, the RO membrane filter element 3 and the second filtering module 4 are respectively arranged in the raw water cavity 11, and the RO membrane filter element 3 and the second filtering module 4 are not communicated with the raw water cavity 11;

a water filtering cavity 211 is arranged inside the first filtering module 2, a water inlet cavity 45 is arranged inside the second filtering module 4, the upper end of the RO membrane filter element 3 is sleeved in the water filtering cavity 211, the lower end of the RO membrane filter element 3 is sleeved in the water inlet cavity 45, and a flow dividing pipe 5 is arranged at the lower end of the RO membrane filter element 3;

the shunt pipe 5 is provided with a pure water runner 511 and a waste water runner 512 which are not communicated with each other; one end of the pure water flow passage 511 is communicated with the pure water outlet end of the RO membrane filter element 3, and the other end is communicated with the water inlet cavity 45; the wastewater channel 512 is communicated with the wastewater outlet end of the RO membrane filter element 3.

The multi-stage filtration filter element is applied to the water route system of water purifier, and is integrated together through filtering module 2, RO membrane filter core 3 and second with first filtration to reduce the quantity of whole filter core in the purifier, realize saving the purpose in the inside space of purifier, solve the purifier and have occupation space big problem. The multi-stage filtration filter element is provided with a shunt tube 5, and the wastewater filtered by the RO membrane filter element 3 and the pure water are separated through a pure water flow passage 511 and a wastewater flow passage 512, so that the water mixing phenomenon is avoided.

Raw water refers to unfiltered water in a waterway system. The RO membrane filter element 3, the second filter module 4 and the raw water cavity 11 are not communicated with each other, and raw water sequentially passes through the first filter module 2, the RO membrane filter element 3 and the second filter module 4 to be subjected to multistage filtration. 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 is gathered in the water filtering cavity 211; the initial filtered water in the water filtering cavity 211 enters the RO membrane filter element 3; the RO membrane cartridge 3 filters the preliminary filtered water into pure water and produces wastewater.

Pure water enters the water inlet cavity 45 through the pure water flow passage 511, is filtered by the second filtering module 4 and then flows to a pure water waterway in the waterway system; and the wastewater is discharged to the wastewater waterway of the waterway system through the wastewater runner 512, so as to avoid the water mixing phenomenon between the wastewater and the pure water.

Further, the second filter module 4 comprises an inner shell 41, a mounting sleeve 42, a rear filter element 43 and a separation pipe 44;

the mounting sleeve 42 is sleeved on the outer side of the RO membrane filter element 3, a first mounting seat 421 is arranged in the middle of the mounting sleeve 42, and a second mounting seat 422 is arranged at the near end of the upper end of the mounting sleeve 42;

a drain pipe 411 is connected to the lower end of the inner shell 41, and the upper end of the inner shell 41 is mounted on the first mounting seat 421; the lower end of the first filter module 2 is mounted on the second mounting seat 422;

the water inlet cavity 45 is arranged in the middle of the rear filter element 43, and the other end of the RO membrane filter element 3 is sleeved in the rear filter element 43; the rear filter element 43 is arranged in the inner shell 41, the upper end of the rear filter element 43 is fixed to the first mounting seat 421, and the lower end of the rear filter element 43 is fixed to the separation pipe 44;

the upper end of the separation pipe 44 is communicated with the waste water flow path 512, and the lower end of the separation pipe 44 is extended from the drain pipe 411.

The mounting sleeve 42 fixes the inner shell 41 and the rear filter element 43 through the first mounting seat 421; the first mounting seat 421 and the inner shell 41 cooperate to form an accommodating space, and the accommodating space is not communicated with the raw water chamber 11, so that pure water and raw water in the accommodating space are prevented from being mixed. The post-positioned filter element 43 is arranged in the accommodating space and used for adsorbing organic matters in the pure water and improving the taste of the pure water. The pure water is filtered by the post-filter 43 to be pure water.

The separation pipe 44, the rear filter element 43 and the first mounting seat 421 are matched, so that pure water flows out of the water inlet cavity 45 through the rear filter element 43, and the problem of water mixing caused by mixing of the pure water and the pure water is avoided.

Further, the partition pipe 44 includes a base portion 441, a baffle portion 442, and a water pipe portion 443; a baffle cavity 412 is recessed at the periphery of the joint of the inner shell 41 and the drain pipe 411;

the lower end of the post-filter element 43 is fixed to the base part 441, a plurality of support bars 4411 are axially arranged on the bottom surface of the base part 441, and the support bars 4411 tightly abut against the outer edge of the baffle cavity 412;

the upper end of the water pipe portion 443 is communicated with the base portion 441, and the lower end of the water pipe portion 443 protrudes from the drain pipe 411; a waste water one-way valve 4431 is arranged in the water pipe part 443;

the baffle portion 442 is provided outside the water pipe portion 443;

the baffle part 442, the baffle concave cavity 412, the outer wall of the water pipe part 443 and the inner wall of the drain pipe 411 are matched to form a purified water flow passage 6; a water purifying cavity 7 is formed by matching the inner wall of the inner shell 41, the outer side wall of the rear filter element 43, the first mounting seat 421 and the base part 441;

the baffle portion 442 is provided with a water purifying port 4421, and the water purifying port 4421 is provided with a water purifying one-way valve 4422; the water purifying flow passage 6 is communicated with the water purifying cavity 7 through a water purifying port 4421.

Referring to fig. 2, 3, 5 and 6, the clean water flows out from the outer side wall of the post-filter element 43 and enters the clean water chamber 7. The baffle part 442 is matched with the baffle concave cavity 412, and the baffle part 442 is embedded in the baffle concave cavity 412, so that the purified water in the purified water cavity 7 can only flow into the purified water flow passage 6 through the purified water port 4421; subsequently, the purified water is discharged from the drain pipe 411. And the purified water port 4421 is provided with a purified water check valve 4422 which defines the flow direction of the purified water and prevents the purified water from flowing back to the purified water chamber 7.

The wastewater is discharged through the water pipe portion 443, and the water pipe portion 443 is provided with a wastewater check valve 4431 to restrict the flow direction of the wastewater, thereby preventing the wastewater from flowing back into the RO membrane cartridge 3.

Referring to fig. 2 and 6, the supporting bars 4411 tightly abut against the outer edge of the baffle cavity 412, so that a gap exists between the base part 441 and the inner wall of the inner casing 41, and purified water can enter the water purifying ports 4421.

Specifically, the housing 1 is provided with a water inlet 12, and the water inlet 12 is arranged outside the water drainage pipe 411;

a check block 413 is arranged on the outer side of the drain pipe 411, and an inner cover groove 13 is recessed on the periphery of the water inlet 12 on the inner wall of the shell 1;

the check block 413, the inner cover groove 13 and the outer wall of the drain pipe 411 are matched to form a raw water inlet cavity 8, the check block 413 is provided with a raw water port 414, and the raw water port 414 is provided with a raw water one-way valve 415;

the raw water inlet chamber 8 is communicated with the raw water chamber 11 through the raw water port 414.

Referring to fig. 2 to 4, the inner lid groove 13 is adapted to the stopper 413, and the stopper 413 is inserted into the inner lid groove 13. By adopting the structure, raw water can only enter the raw water cavity 11 through the raw water port 414 after flowing into the raw water inlet cavity 8 from the water inlet 12, and the raw water port 414 is provided with the raw water check valve 415, so that the flowing direction of the raw water is limited, the problem of backflow of the raw water is avoided, and water leakage of the multi-stage filter element is prevented when the filter element is replaced.

Further, the shunt 5 comprises a tube body 51 and a blocking ring 52;

the pure water flow passage 511 and the waste water flow passage 512 are respectively arranged on the pipe body 51, and the pure water flow passage 511 comprises a pure water flow passage inlet 53 and a pure water flow passage outlet 54; the waste runner 512 includes a waste runner inlet 55 and a waste runner outlet 56; the pure water flow passage inlet 53 is arranged at the upper end of the tube body 51, and the pure water flow passage outlet 54 is arranged on the left side wall of the tube body 51; the waste water runner inlet 55 is arranged on the right side wall of the pipe body 51, and the waste water runner outlet 56 is arranged at the lower end of the pipe body 51;

the blocking ring 52 is sleeved outside the pipe body 51, and the blocking ring 52 is located between the pure water flow passage outlet 54 and the waste water flow passage inlet 55.

Further, the RO membrane cartridge 3 comprises a sealing cap 31, a water collecting pipe 32 and a membrane structure 33;

the sealing cover 31 is arranged at the lower end of the filter membrane structure 33, and the sealing cover 31 is provided with a water outlet pipe 311; the blocking ring 52 is embedded in the water outlet pipe 311;

the lower end of the pipe body 51 extends out of the sealing cover 31, and the pure water flow passage outlet 54 is communicated with the water inlet cavity 45; the waste water runner outlet 56 communicates with the water pipe portion 443; the wastewater runner inlet 55 is communicated with the wastewater outlet end of the filter membrane structure 33;

the filter membrane structure 33 is sleeved outside the water collecting pipe 32, and the inside of the filter membrane structure 33 is communicated with the side wall of the water collecting pipe 32;

and a water plugging block 34 is arranged at the upper end near end of the water collecting pipe.

With the above-described structure, the pure water flow passage 511 and the wastewater flow passage 512 are not communicated with each other, and the partition ring 52 is located between the pure water flow passage outlet 54 and the wastewater flow passage inlet 55.

The upper end of the filter membrane structure 33 is the water inlet end of the RO membrane filter element 3, the lower end of the filter membrane structure 33 is the wastewater outlet end of the RO membrane filter element 3, and the lower end of the water collecting pipe 32 is the pure water outlet end of the RO membrane filter element 3.

The upper end of the shunt pipe 5 is connected with the water collecting pipe 32, the blocking ring 52 is embedded in the water outlet pipe 311, and the pure water flow passage outlet 54 and the waste water flow passage outlet 56 extend out of the water outlet pipe 311. Pure water enters the pure water flow passage 511 from the pure water flow passage inlet 53 and flows to the water inlet chamber 45 from the pure water flow passage outlet 54. And wastewater enters wastewater channel 512 from wastewater channel inlet 55 and enters drain 411 from wastewater channel outlet 56. So set up, pure water and waste water can not take place to mix, avoid the problem of shui qu.

In a specific embodiment, the mounting sleeve 42 is sleeved outside the filter membrane structure 33, and a water stop is wound around the assembly gap between the filter membrane structure 33 and the mounting sleeve 42, so that the initial filter water is prevented from permeating into the inner side of the body part from the assembly gap between the filter membrane structure 33 and the mounting sleeve 42, and the problem of water leakage is avoided.

The water blocking block 34 plays a role in isolating pure water and primary filtered water, and prevents the primary filtered water from entering from the upper end of the water collecting pipe 331, so that the primary filtered water is mixed with the pure water, and the problem of water mixing is caused.

Specifically, the upper 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.

Referring to fig. 2, the mounting sleeve 42 fixes the first filtering module 2 through the second mounting seat 422, and through the cooperation of the second mounting seat 422, the first filtering module 2 and the front sealing cover 23, raw water enters from the outer side wall of the first filtering module 2, is filtered by the first filtering module 2 to form primary filtered water, and is collected in the water filtering cavity 211; the initial water again gets into RO membrane filter core 3 through the upper end of RO membrane filter core 3, avoids the raw water to get into water filtering cavity 211 and mix with the initial water from the upper end of first filtration module 2, leads to the problem of crossing water.

Specifically, the first filtering module 2 comprises a folded PP cotton filter element 21 and a front activated carbon filter element 22; the folding PP cotton filter element 21 is sleeved outside the front active carbon filter element 22;

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

The first filtering module 2 is formed by compounding a front activated carbon filter element 22 and a folding PP cotton filter element 21. The raw water firstly passes through the folding PP cotton filter element 21 to filter out larger impurities in the raw water, and then passes through the active carbon filter element to adsorb fine impurities in the raw water. So set up, can prolong RO membrane filter core 3's life.

In a preferred embodiment of the present invention, the pre-activated carbon filter element 22 is provided with a scale inhibiting layer, and the scale inhibiting layer is loaded with a 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 3.

Optionally, the rear filter element 43 includes a rear activated carbon filter element 431 and a sterile non-woven fabric 432, and the sterile non-woven fabric 432 is wrapped outside the rear activated carbon filter element 431.

Referring to fig. 2, the post-filter element 43 can be referred to a conventional filter element, and pure water enters from the side wall of the post-filter element 43, is filtered into pure water by the post-filter element 43, and flows out from the water inlet cavity 45, so as to avoid the problem of water mixing caused by direct mixing of the pure water and the pure water. Adopt above-mentioned structure, realize adsorbing the organic matter in the pure water through rearmounted active carbon filter 431, improve the taste of pure water, afterwards, aseptic non-woven fabrics 432 of rethread realizes antibiotic deodorant purpose.

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

1. A multistage filter core, its characterized in that: the multistage filter element comprises a shell, a first filter module, an RO membrane filter element and a second filter module;

2. A multiple stage filtration cartridge according to claim 1 wherein: the second filtering module comprises an inner shell, a mounting sleeve, a rear filter element and a separating pipe;

3. A multi-stage filtration cartridge according to claim 2 wherein: the separation pipe comprises a base part, a baffle part and a water pipe part; a baffle concave cavity is recessed at the periphery of the joint of the inner shell and the drain pipe;

the baffle part is arranged on the outer side of the water pipe part;

4. A multi-stage filtration cartridge according to claim 2 wherein: the shell is provided with a water inlet which is arranged on the outer side of the drain pipe;

5. A multi-stage filtration cartridge according to claim 3 wherein: the shunt pipe comprises a pipe body and a blocking ring;

6. A multi-stage filtration cartridge according to claim 5 wherein: the RO membrane filter element comprises a sealing cover, a water collecting pipe and a filter membrane structure;

7. A multiple stage filtration cartridge according to claim 1 wherein: the upper end of the first filtering module is provided with a front sealing cover, and the front sealing cover is used for separating raw water and primary filtered water.

8. A multi-stage filtration cartridge according to claim 2 wherein: 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 outside the front active carbon filter element;

9. A multi-stage filtration cartridge according to claim 2 wherein: the rear filter element comprises a rear activated carbon filter element and an aseptic non-woven fabric, and the aseptic non-woven fabric is wrapped on the outer side of the rear activated carbon filter element.