CN210313648U - Filter, water purification unit and water purification system - Google Patents

Abstract

The utility model discloses a filter, purifier and water purification system. Wherein, the filter comprises a shell and a filter element; the shell is provided with a water inlet, a purified water outlet and a wastewater outlet; the filter element is arranged in the shell; the filter element comprises a central tube, a diaphragm and a membrane ring; the central pipe comprises a water inlet hole and a water outlet hole, and the purified water outlet is communicated with the water outlet hole; the membrane is wrapped on the outer side of the central tube, and a cavity is formed between the membrane and the shell; the water inlet and the waste water outlet are both communicated with the cavity; the ratio of the inner diameter D1 of the housing to the outer diameter D2 of the diaphragm has the range of values: d1 is more than or equal to 2, and D2 is more than or equal to 10; the diaphragm ring is clamped between the diaphragm and the inner wall of the shell. In the technical proposal of the utility model, the tap water flows into the central tube through the membrane ring and the membrane after being filtered, and is discharged from the purified water outlet, and the waste water remained in the cavity is discharged from the waste water outlet; setting the range value of the ratio of the inner diameter D1 of the shell to the outer diameter D2 of the diaphragm to be more than or equal to 2 and less than or equal to D1: D2 and less than or equal to 10; it is possible to avoid both the membrane becoming clogged very quickly with contaminants and the filter becoming bulky.

Description

Filter, water purification unit and water purification system

Technical Field

The utility model relates to a water purification technical field, in particular to filter, applied this filter's water purification unit and applied this filter or applied this water purification unit's water purification system.

Background

Along with the improvement of living standard of people, people pay more and more attention to the current water quality. At present, a lot of users have installed water purifying devices at home, in which a filter plays the most important role, most of the wastewater generated in some water purifying devices is discharged into a sewer regularly and quantitatively through the wastewater ratio controlled by an electromagnetic valve, and the other part of the wastewater needs to be accumulated in the filter, so that a certain space for storing the wastewater needs to be reserved in the filter. In addition, the more clean water is generated by the filter, the more waste water is generated, and the service life of the filter is shorter in the limited space for storing the waste water of the filter; however, if the water storage space of the filter is increased in order to increase the service life of the filter, the installation space of the filter is increased, and the amount of tap water is wasted.

The above is only for the purpose of assisting understanding of the technical solutions of the present application, and does not represent an admission that the above is prior art.

SUMMERY OF THE UTILITY MODEL

The utility model mainly aims at providing a filter, aim at improving the life of filter.

In order to achieve the above purpose, the utility model provides a filter, which comprises a shell and a filter element; the shell is provided with a water inlet, a purified water outlet and a wastewater outlet; the filter element is arranged in the shell; the filter element comprises a central tube, a diaphragm and a membrane ring; the central pipe comprises a water inlet hole and a water outlet hole, and the purified water outlet is communicated with the water outlet hole; the membrane is wrapped on the outer side of the central pipe, and a cavity is formed between the membrane and the shell; the water inlet and the waste water outlet are both communicated with the cavity; the ratio of the inner diameter D1 of the housing to the outer diameter D2 of the diaphragm has a range of values: d1 is more than or equal to 2, and D2 is more than or equal to 10; the membrane ring is clamped between the membrane and the inner wall of the shell.

Optionally, the central tube comprises a connecting section and a water passing section connected with the connecting section, and the connecting section shields the water inlet; the water passing section is hollow, and the side wall of the water passing section is provided with the water inlet hole; the membrane ring is arranged corresponding to the connecting section.

Optionally, a plurality of water inlet holes are formed in the central tube, and the plurality of water inlet holes are distributed at intervals along the axial direction of the central tube; and/or the water inlet holes are provided with a plurality of water inlet holes which are distributed along the circumferential direction of the central pipe at intervals.

Optionally, the housing comprises a membrane shell vial and an end cap; the filter element is arranged in the membrane shell bottle body, the membrane shell bottle body is provided with an installation opening, and the end cover is detachably connected with the membrane shell bottle body and covers the installation opening; the water inlet is arranged on the end cover, and the waste water outlet and the purified water outlet are arranged at the bottom of the membrane shell bottle body.

Optionally, the size of the outer diameter of the membrane ring is gradually reduced from the end cover to the bottom of the membrane shell bottle body; one end, close to the end cover, of the membrane ring is in interference fit with the membrane shell bottle body, and one end, far away from the end cover, of the membrane ring is in clearance fit with the membrane shell bottle body;

and/or, the protruding spacing ring that is equipped with of inside wall of membrane shell bottle, the spacing ring is close to the diapire setting of membrane shell bottle, the center tube passes the spacing ring, just the inner wall of spacing ring supports and holds the lateral wall of center tube.

Optionally, when the protruding spacing ring that is equipped with of inside wall of membrane shell bottle, the center tube with press from both sides between the spacing ring and be equipped with the sealing washer.

Optionally, the side of the central tube facing the bottom wall of the membrane shell bottle body is formed with a chamfer.

Optionally, the outlet area of the clean water outlet is smaller than the outlet area of the waste water outlet.

The utility model also provides a water purifying device, which comprises a filter, wherein the filter comprises a shell and a filter element; the shell is provided with a water inlet, a purified water outlet and a wastewater outlet; the filter element is arranged in the shell; the filter element comprises a central tube, a diaphragm and a membrane ring; the central pipe comprises a water inlet hole and a water outlet hole, and the purified water outlet is communicated with the water outlet hole; the membrane is wrapped on the outer side of the central pipe, and a cavity is formed between the membrane and the shell; the water inlet and the waste water outlet are both communicated with the cavity; the ratio of the inner diameter D1 of the housing to the outer diameter D2 of the diaphragm has a range of values: d1 is more than or equal to 2, and D2 is more than or equal to 10; the membrane ring is clamped between the membrane and the inner wall of the shell.

The utility model also provides a water purification system, which comprises the water purification equipment or the filter, wherein the filter comprises a shell and a filter element; the shell is provided with a water inlet, a purified water outlet and a wastewater outlet; the filter element is arranged in the shell; the filter element comprises a central tube, a diaphragm and a membrane ring; the central pipe comprises a water inlet hole and a water outlet hole, and the purified water outlet is communicated with the water outlet hole; the membrane is wrapped on the outer side of the central pipe, and a cavity is formed between the membrane and the shell; the water inlet and the waste water outlet are both communicated with the cavity; the ratio of the inner diameter D1 of the housing to the outer diameter D2 of the diaphragm has a range of values: d1 is more than or equal to 2, and D2 is more than or equal to 10; the membrane ring is clamped between the membrane and the inner wall of the shell.

The utility model discloses technical scheme is through installing the filter core in the casing, and the casing is equipped with the water inlet, then the running water can follow in the water inlet gets into the casing to filter through the filter core. Specifically, the filter element comprises a central tube, a membrane wrapped outside the central tube and a membrane ring clamped between the membrane and the inner wall of the shell, so that tap water can be firstly purified through the membrane ring for the first time, then purified through the membrane for the second time, and finally flows into the central tube and is discharged through the purified water outlet to be thoroughly purified. In addition, a cavity is formed between the membrane and the shell, the waste water outlet is communicated with the cavity, and concentrated water which does not penetrate through the membrane and enter the central pipe is remained in the cavity and can be discharged through the waste water outlet. The membrane ring clamp is located between diaphragm and the casing, makes the filter core can stabilize and install in the casing, guarantees the steadiness of filter core installation. Further, the range value of the ratio of the inner diameter D1 of the shell to the outer diameter D2 of the diaphragm is set to be 2 ≦ D1: D2 ≦ 10; both then can guarantee to deposit the water chamber and have suitable water space in order to avoid the diaphragm to be blockked up by the pollutant very fast, on the other hand still avoids the casing of filter too big relatively to the filter core, and makes the filter core have under the condition of the same pure water system water yield, the casing occupies great installation space.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a front view of one embodiment of the filter of the present invention;

fig. 2 is a cross-sectional view a-a of fig. 1.

The reference numbers illustrate:

the objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that, if directional indications (such as upper, lower, left, right, front and rear … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are changed accordingly.

In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

The utility model provides a filter.

In an embodiment of the present invention, please refer to fig. 1 and fig. 2 in combination, the filter includes a housing 100 and a filter element 200; the shell 100 is provided with a water inlet 121, a purified water outlet 111 and a waste water outlet 112; the filter cartridge 200 is disposed inside the housing 100; the cartridge 200 includes a center tube 210, a membrane sheet 220, and a membrane ring 230; the central tube 210 includes a water inlet 2121 and a water outlet 2122, and the purified water outlet 111 is communicated with the water outlet 2122; the membrane 220 is wrapped outside the central tube 210, and a cavity 101 is formed between the membrane and the shell 100; the water inlet 121 and the waste water outlet 112 are both communicated with the cavity 101; the ratio of the inner diameter D1 of the housing 100 to the outer diameter D2 of the diaphragm 220 has a range of values: d1 is more than or equal to 2, and D2 is more than or equal to 10; the diaphragm ring 230 is sandwiched between the diaphragm 220 and the inner wall of the housing 100.

By mounting the filter cartridge 200 within the housing 100, the housing 100 can protect the filter cartridge 200. Further, the filter element 200 includes a central tube 210, a membrane 220 and a membrane ring 230, the membrane 220 wraps the outside of the central tube 210, a cavity 101 is formed between the membrane 220 and the housing 100, the water inlet 121 of the housing 100 is communicated with the cavity 101, so that tap water entering the housing 100 from the water inlet 121 can firstly filter particulate matters and/or ions in the tap water through the membrane 220, and thus filtered purified water enters the central tube 210 through the membrane 220, and further, since the central tube 210 is communicated with the purified water outlet 111, the purified water flowing into the central tube 210 can flow out through the purified water outlet 111. In addition, the cavity 101 formed between the diaphragm 220 and the housing 100 communicates with the waste water outlet 112, and the thick water that does not pass through the diaphragm 220 may be retained in the cavity 101 and discharged through the waste water outlet 112. It will be appreciated that the central tube 210 is provided with a water inlet 121, through which inlet 121 purified water permeating the membrane 220 can enter the central tube 210. The membrane ring 230 is clamped between the membrane 220 and the housing 100, so that on one hand, the central tube 210 can be prevented from shaking between the housings 100, and the stability of the installation of the filter element 200 in the housing 100 is ensured; on the other hand, the membrane ring 230 can purify primary tap water to meet the requirement of domestic water, and on the other hand, the membrane 220 can completely purify secondary tap water, so that purified water passing through the membrane 220 flows into the central tube 210 and then flows out from the purified water outlet 111.

It can be understood that the water storage cavity is formed between the diaphragm 220 and the housing 100, and when tap water enters the housing 100 through the water inlet 121, the water in the water storage cavity is pushed to flush pollutants on the diaphragm 220, so that the situation that the pollutants are adhered to the diaphragm 220 for a long time to disable the filtering effect of the filter can be avoided, and the service life of the filter is prolonged. The technical scheme of the utility model, the internal diameter of definition casing 100 is D1, and the external diameter of diaphragm 220 is D2, through 2 being less than or equal to D1D 2 is less than or equal to 10, then both can guarantee to deposit the water chamber and have suitable water space, on the other hand still avoids the casing 100 of filter to be too big relative filter core 200, and makes filter core 200 have under the condition of the same pure water system water yield, casing 100 occupies great installation space. Specifically, the ratio of the inner diameter D1 of the housing 100 to the outer diameter D2 of the diaphragm 220 may be 2, 3, 4, 5, 6, 7, 8, 9, or 10, etc., as long as 2. ltoreq. D1: D2. ltoreq.10 are satisfied. When D1 is D2 < 2, the space of a water storage cavity formed between the diaphragm 220 of the filter element 200 and the inner wall of the shell 100 is small, so that pollutants in water easily block the diaphragm 220; when D1: D2 > 10, housing 100 is oversized relative to cartridge 200, thereby allowing the installation space occupied by housing 100 to remain large when a smaller cartridge 200 is used, requiring less water production.

The utility model discloses technical scheme is through installing filter core 200 in casing 100, and casing 100 is equipped with water inlet 121, then in water inlet 121 can be followed to the running water gets into casing 100 to filter through filter core 200. Specifically, the filter element 200 includes a central tube 210, a membrane 220 wrapped outside the central tube 210, and a membrane ring 230 sandwiched between the membrane 220 and the inner wall of the housing 100, so that tap water can be firstly purified by the membrane ring 230, and then purified by the membrane 220, and finally flow into the central tube 210 and be discharged through the purified water outlet 111. In addition, a cavity 101 is formed between the membrane 220 and the housing 100, and the waste water outlet 112 is communicated with the cavity 101, so that the concentrated water which does not penetrate through the membrane 220 into the central pipe 210 is retained in the cavity 101 and can be discharged through the waste water outlet 112. The membrane ring 230 is disposed between the membrane 220 and the housing 100, so that the filter element 200 can be stably installed in the housing 100, and the stability of installation of the filter element 200 is ensured. Further, by setting the range value of the ratio of the inner diameter D1 of the housing 100 to the outer diameter D2 of the diaphragm 220 to 2. ltoreq. D1: D2. ltoreq.10; it is ensured that the water holding chamber has a suitable water holding space to prevent the membrane 220 from being blocked by contaminants soon, and on the other hand, it is avoided that the housing 100 of the filter is too large relative to the filter element 200, so that the housing 100 occupies a large installation space under the condition that the filter element 200 has the same pure water producing capacity.

Further, as shown in fig. 2, the central tube 210 includes a connecting section 211 and a water passing section 212 connected to the connecting section 211, wherein the connecting section 211 shields the water inlet 121; the water passing section 212 is hollow, and the side wall of the water passing section 212 is provided with a water inlet 2121; the membrane ring 230 is disposed corresponding to the connection section 211.

Through the above arrangement, the tap water flowing in from the water inlet 121 is prevented from flowing into the central tube 210 first, but the tap water is ensured to be firstly purified by the membrane ring 230 and then enter the central tube 210 from the water inlet 2121 of the water passing section 212 of the central tube 210 after being purified by the membrane 220, so that the water in the central tube 210 is ensured to be completely purified pure water.

In order to improve the efficiency of preparing pure water, in this embodiment, the water inlet 2121 is opened in a plurality of holes. By providing the plurality of water inlet holes 2121, the pure water filtered by the membrane 220 can enter the central tube 210 through the plurality of water inlet holes 2121 at the same time, thereby increasing the efficiency of flowing out the pure water from the pure water outlet 111. Specifically, a plurality of water inlet holes 2121 may be spaced along the axial direction of the central tube 210; of course, the plurality of water inlet holes 2121 may also be distributed at intervals along the circumferential direction of the central tube 210; or a part of the plurality of water inlet holes 2121 are spaced apart in the axial direction of the center pipe 210, and another part are spaced apart in the circumferential direction of the center pipe 210.

Referring to fig. 1 and 2, in order to facilitate assembly, in the present embodiment, the housing 100 includes a membrane housing bottle 110 and an end cap 120; the filter element 200 is installed in the membrane shell bottle body 110, the membrane shell bottle body 110 is provided with an installation opening (not shown in the figure), and the end cover 120 is detachably connected with the membrane shell bottle body 110 and covers the installation opening; the water inlet 121 is opened at the end cap 120, and the waste water outlet 112 and the clean water outlet 111 are opened at the bottom of the membrane shell bottle 110.

By providing the housing 100 with the membrane housing bottle 110 and the end cap 120 detachably connected to the membrane housing bottle 110, the user can easily replace the filter cartridge 200 inside at any time, so that the housing 100 can be reused. Specifically, the membrane housing vial 110 and the end cap 120 may be threaded or snap-fit, etc. In order to guarantee better leakproofness, the utility model discloses optional membrane shell bottle 110 and end cover 120 threaded connection among the technical scheme, one of them of membrane shell bottle 110 and end cover 120 can be equipped with the internal thread promptly, and another person corresponds and is equipped with the external screw thread, closes the effect of being connected who realizes membrane shell bottle 110 and end cover 120 through internal thread and external screw thread soon.

By opening the water inlet 121 at the end cap 120, and the waste water outlet 112 and the purified water outlet 111 at the bottom of the membrane housing bottle 110, the structure of the filter cartridge 200 is made relatively simple. Of course, it is understood that the waste water outlet 112 and/or the clean water outlet 111 may be located at the same end as the water inlet 121.

Further, as shown in fig. 2, the outer diameter of the membrane ring 230 gradually decreases from the end cap 120 to the bottom of the membrane housing bottle 110; one end of the membrane ring 230 close to the end cap 120 is in interference fit with the membrane housing bottle body 110, and one end of the membrane ring 230 far from the end cap 120 is in clearance fit with the membrane housing bottle body 110.

By gradually decreasing the outer diameter of the membrane ring 230 in the direction from the end cap 120 to the bottom of the membrane housing bottle 110, the filter cartridge 200 is easily installed into the inner cavity of the membrane housing bottle 110 through the installation opening of the membrane housing bottle 110. Further, through the one end and the membrane shell bottle 110 interference fit that are close to end cover 120 with membrane ring 230, the one end and the membrane shell bottle 110 clearance fit that end cover 120 was kept away from to membrane ring 230, then on the one hand can play the slow-witted effect of preventing when the filter core 200 assembles, on the other hand can guarantee that the filter core 200 just has been packed into when membrane shell bottle 110 easier, can also make after the filter core 200 has been installed, it is inseparable with being connected between the membrane shell bottle 110, has guaranteed the steadiness of filter core 200 installation.

Further, as shown in fig. 2, the inner sidewall of the membrane shell bottle 110 may be convexly provided with a limiting ring 113, the limiting ring 113 is disposed near the bottom wall of the membrane shell bottle 110, the central tube 210 passes through the limiting ring 113, and the inner wall of the limiting ring 113 abuts against the sidewall of the central tube 210. Through the arrangement of the limiting ring 113, on one hand, the limiting effect can be achieved on the installation of the filter element 200, so that the installation effect of the filter element 200 is further improved; on the other hand, the inner wall of the limiting ring 113 abuts against the side wall of the central tube 210, so that the limiting ring 113 can relatively isolate the cavity 101 between the membrane 220 and the membrane housing bottle 110 from the water outlet of the central tube 210.

Further, as shown in fig. 2, when the inner sidewall of the membrane housing bottle 110 is protruded with the limiting ring 113, the sealing ring 300 is sandwiched between the central tube 210 and the limiting ring 113.

Through locating sealing washer 300 clamp between center tube 210 and spacing ring 113, make cavity 101 that forms between diaphragm 220 and the membrane shell bottle 110 not communicate with the export of center tube 210 to avoid water purification and waste water to mix, guaranteed the play water quality of water purification.

Further, as shown in fig. 2, a side of the center tube 210 facing the bottom wall of the membrane housing bottle 110 is formed with a chamfer. So set up, then when the center tube 210 inserts in spacing ring 113, the installation of center tube 210 is convenient.

Further, as shown in fig. 1, the outlet area of the purified water outlet 111 is smaller than the outlet area of the waste water outlet 112.

It can be understood that when a user needs to utilize the waste water, by setting the outlet area of the purified water outlet 111 to be smaller than the outlet area of the waste water outlet 112, the amount of water flowing out of the waste water outlet 112 can be made to meet the user's demand.

The utility model discloses still provide a water purification unit, this water purification unit includes the filter, and the concrete structure of this filter refers to above-mentioned embodiment, because this water purification unit has adopted the whole technical scheme of above-mentioned all embodiments, consequently has all beneficial effects that the technical scheme of above-mentioned embodiment brought at least, no longer gives unnecessary details one by one here.

The utility model discloses still provide a water purification system, this water purification system includes water purification unit or filter, and the concrete structure of this water purification unit or filter refers to above-mentioned embodiment, because this water purification system has adopted the whole technical scheme of above-mentioned all embodiments, consequently has all beneficial effects that the technical scheme of above-mentioned embodiment brought at least, and the repeated description is no longer given here.

Further, the water purification system further comprises a water purification faucet and a domestic water faucet, wherein the water purification faucet is communicated with the water purification outlet 111, and the domestic water faucet is communicated with the waste water outlet 112. It can be understood that the domestic water tap can satisfy the water for washing clothes, washing vegetables or mopping the floor by users at ordinary times, and the domestic water tap is opened for a longer time than the water tap because the water for the domestic water tap is not directly drunk by the users and the water for the domestic water tap is much more than the water for drinking. When a user opens the domestic water faucet, tap water can always wash the membrane 220 of the filter, so that residual pollutants on the membrane 220 can be washed by the way, the membrane 220 is prevented from being blocked by the pollutants, and the service life of the filter is prolonged. In addition, due to the washing of a large amount of tap water, the waste water generated by the filter can be diluted by the tap water, so that the requirement of domestic water is met.

The above is only the optional embodiment of the present invention, and not the scope of the present invention is limited thereby, all the equivalent structure changes made by the contents of the specification and the drawings are utilized under the inventive concept of the present invention, or the direct/indirect application in other related technical fields is included in the patent protection scope of the present invention.

Claims (10)

1. A filter, comprising:

the device comprises a shell, a water inlet, a purified water outlet and a wastewater outlet, wherein the shell is provided with the water inlet, the purified water outlet and the wastewater outlet; and

a filter element disposed within the housing; the filter element comprises:

the central pipe comprises a water inlet hole and a water outlet hole, and the purified water outlet is communicated with the water outlet hole;

the membrane is wrapped on the outer side of the central pipe, and a cavity is formed between the membrane and the shell; the water inlet and the waste water outlet are both communicated with the cavity; the ratio of the inner diameter D1 of the housing to the outer diameter D2 of the diaphragm has a range of values: d1 is more than or equal to 2, and D2 is more than or equal to 10; and

and the membrane ring is clamped between the membrane and the inner wall of the shell.

2. The filter of claim 1, wherein the center tube includes a connection section and a water passing section connected to the connection section, the connection section blocking the water inlet; the water passing section is hollow, and the side wall of the water passing section is provided with the water inlet hole; the membrane ring is arranged corresponding to the connecting section.

3. The filter of claim 2, wherein the water inlet hole is opened in a plurality, and the water inlet holes are distributed at intervals along the axial direction of the central tube;

and/or the water inlet holes are provided with a plurality of water inlet holes which are distributed along the circumferential direction of the central pipe at intervals.

4. The filter of claim 1, wherein the housing comprises a membrane shell vial and an end cap; the filter element is arranged in the membrane shell bottle body, the membrane shell bottle body is provided with an installation opening, and the end cover is detachably connected with the membrane shell bottle body and covers the installation opening; the water inlet is arranged on the end cover, and the waste water outlet and the purified water outlet are arranged at the bottom of the membrane shell bottle body.

5. The filter of claim 4, wherein the membrane ring has a decreasing outer diameter dimension in a direction from the end cap to the bottom of the membrane housing vial; one end, close to the end cover, of the membrane ring is in interference fit with the membrane shell bottle body, and one end, far away from the end cover, of the membrane ring is in clearance fit with the membrane shell bottle body;

and/or, the protruding spacing ring that is equipped with of inside wall of membrane shell bottle, the spacing ring is close to the diapire setting of membrane shell bottle, the center tube passes the spacing ring, just the inner wall of spacing ring supports and holds the lateral wall of center tube.

6. The filter of claim 5, wherein when the inner side wall of the membrane shell bottle body is convexly provided with the limiting ring, a sealing ring is clamped between the central tube and the limiting ring.

7. The filter of claim 5, wherein the side of the center tube facing the bottom wall of the membrane housing vial is chamfered.

8. The filter of any one of claims 1 to 7, wherein the clear water outlet has an outlet area smaller than the waste water outlet.

9. A water purification apparatus, comprising a filter according to any one of claims 1 to 8.

10. A water purification system comprising the water purification apparatus of claim 9; or, comprising a filter according to any one of claims 1 to 8; the water purification system further comprises a water purification faucet and a domestic water faucet, the water purification faucet is communicated with the water purification outlet, and the domestic water faucet is communicated with the wastewater outlet.

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