Multi-stage filtering structure and water purifier

Abstract

The utility model relates to a multi-stage filtering structure and a water purifier. Relates to the technical field of water purification equipment. The water purifier specifically comprises a first-stage filter element, a second-stage filter element, a third-stage filter element and a fourth-stage filter element, the first-stage filter element, the second-stage filter element, the third-stage filter element and the fourth-stage filter element are sequentially communicated, and water outlets are formed in the first-stage filter element, the second-stage filter element, the third-stage filter element and the fourth-stage filter element; the water storage tank is communicated with the fourth-stage filter element; the water storage tank is used for storing water filtered by the first-stage filter element, the second-stage filter element, the third-stage filter element and the fourth-stage filter element in sequence. The water outlets are formed in the first-stage filter element, the second-stage filter element, the third-stage filter element and the fourth-stage filter element, so that the water purifier can efficiently discharge water according to different water demands, the water discharge efficiency of the water purifier is improved, a user can freely select the filtering grade and the filtering frequency according to actual demands, the functions of the water purifier are more diversified, and the water purifier is suitable for popularization and application. And the practicability is higher.

Description

Technical Field

[0001] The utility model relates to the technical field of water purification equipment, in particular to a multi-stage filtering structure and a water purifier. Background Art

[0002] Since most of the water in the current municipal water supply pipe network is not directly drinkable, in order to meet the drinking standard, it needs to be purified. The existing drinking water purification equipment realizes the purification of raw water by passing the raw water to be treated through a filter element with a filtering function.

[0003] In order to obtain a better purification effect, multiple filter elements are usually provided to comprehensively remove floating particulate matter, organic pollutants, residual chlorine and partial bacterial contamination in the raw water, so as to meet the standard of being directly drinkable, and at the same time, it also has the effect of improving the taste of drinking water. However, since the multi-stage filtering devices of the current water purifiers are mostly arranged side by side in the equipment, they occupy space and the water outlet is a single water outlet, which cannot efficiently discharge water according to different water use requirements and has a single function, and cannot meet the needs of users. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a multi-stage filtering structure and a water purifier for the deficiencies of the above-mentioned existing technologies, which can efficiently discharge water according to different water use requirements, improve the water discharge efficiency of the water purifier, and users can freely select the filtering level and times according to actual needs, so that the functions of the water purifier are more diversified and the practicability is stronger.

[0005] The utility model provides a multi-stage filtering structure, which includes a primary filter element, a secondary filter element, a tertiary filter element and a quaternary filter element. The primary filter element, the secondary filter element, the tertiary filter element and the quaternary filter element are connected in sequence, and water outlet ports are provided on the primary filter element, the secondary filter element, the tertiary filter element and the quaternary filter element; it also includes a water storage tank connected to the quaternary filter element, and the water storage tank is used for storing the water that has been filtered through the primary filter element, the secondary filter element, the tertiary filter element and the quaternary filter element in sequence.

[0006] Further, the primary filter element includes a first housing with a first filtering chamber provided therein, and a first filter screen provided in the first filtering chamber, and the first filter screen filters the water flowing through the first filtering chamber.

[0007] Further, both the secondary filter element and the tertiary filter element include a second housing with a second filtering chamber provided therein, a second filter screen provided in the second filtering chamber, and a filter membrane provided outside the second filter screen, and the second filter screen and the filter membrane filter the water flowing through the second filtering chamber in sequence.

[0008] Further, the four - stage filter element includes a third housing with a third filter cavity provided therein, a third filter screen disposed in the third housing, and a reverse osmosis membrane disposed outside the third filter screen. The third filter screen and the reverse osmosis membrane sequentially filter the water flowing through the third filter cavity.

[0009] Further, the first filter screen, the second filter screen, and the third filter screen are all made of titanium alloy material.

[0010] Further, the filter membrane is made of graphene material.

[0011] Further, the multi - stage filtration structure further includes water outlet pipes respectively disposed on the first - stage filter element, the second - stage filter element, the third - stage filter element, and the fourth - stage filter element, and water outlets are formed in the water outlet pipes.

[0012] Further, the first - stage filter element, the second - stage filter element, the third - stage filter element, and the fourth - stage filter element are connected in series through a hose.

[0013] Further, the multi - stage filtration structure further includes a driving device disposed between the third - stage filter element and the fourth - stage filter element. The driving device is used to drive the water filtered successively through the first - stage filter element, the second - stage filter element, the third - stage filter element, and the fourth - stage filter element to flow towards the water storage tank.

[0014] The present utility model also provides a water purifier, including the above - mentioned multi - stage filtration structure.

[0015] The multi - stage filtration structure and the water purifier of the present utility model have the following beneficial effects:

[0016] (1) Water outlets are provided on the first - stage filter element, the second - stage filter element, the third - stage filter element, and the fourth - stage filter element of the multi - stage filtration structure, so that the water purifier can efficiently discharge water according to different water use requirements, improving the water discharge efficiency of the water purifier. Moreover, users can freely select the filtration level and times according to actual needs, making the functions of the water purifier more diverse and more practical.

[0017] (2) The first - stage filter element of the multi - stage filtration structure includes a first housing and a first filter screen. A first filter cavity is provided in the first housing, and the first filter screen is disposed in the first filter cavity. The tap water flowing through the first filter cavity is filtered by the first filter screen, thereby realizing the micro - filtration of tap water and removing various visible substances in the tap water, such as dust and impurities, etc., making the water quality cleaner.

[0018] (3) The secondary filter element and the tertiary filter element of this multi-stage filtration structure both include a second housing, a second filter screen, and a filter membrane. A second filtration chamber is provided in the second housing. The second filter screen is arranged in the second filtration chamber, and the filter membrane is arranged outside the second filter screen. The water flowing through the second filtration chamber is filtered successively by the second filter screen and the filter membrane, thereby realizing the ultrafiltration of water, removing chlorine and organic impurities in the water, and also absorbing the peculiar smell, color, and odor generated by organic compounds in the water;

[0019] (4) The quaternary filter element of this multi-stage filtration structure includes a third housing, a third filter screen, and a reverse osmosis membrane. A third filtration chamber is provided in the third housing. The third filter screen is arranged in the third filtration chamber, and the reverse osmosis membrane is arranged outside the third filter screen. The water flowing through the third filtration chamber is filtered successively by the third filter screen and the reverse osmosis membrane to remove substances such as bacteria, viruses, and spores in the water;

[0020] (5) The first filter screen, the second filter screen, and the third filter screen of this multi-stage filtration structure are all made of titanium alloy material. Due to the good antibacterial effect and biocompatibility of titanium alloy, compared with traditional PP and fiber filter materials, the first filter screen, the second filter screen, and the third filter screen made of titanium alloy material can better improve the water quality when filtering water, thereby enhancing the filtration effect of this multi-stage filtration structure;

[0021] (6) The filter membranes of the secondary filter element and the tertiary filter element of this multi-stage filtration structure are made of graphene material. Due to the stable weather resistance, biocompatibility, safety, and antibacterial and mildew-proof performance of graphene, the filter membrane made of graphene material can not only enhance the filtration effect of the secondary filter element and the tertiary filter element, but also extend the service life of the secondary filter element and the tertiary filter element, and can also ensure the water quality stability of the water purifier when it is not used for a long time;

[0022] (7) The primary filter element, the secondary filter element, the tertiary filter element, and the quaternary filter element of this multi-stage filtration structure are adjusted from the traditional parallel arrangement to a front-to-back connection method, and the primary filter element, the secondary filter element, the tertiary filter element, and the quaternary filter element are connected in series through hoses, so that the installation of each stage of filter element can be more hidden and installed in the corresponding position according to the required position, thereby making the installation of this multi-stage filtration structure in the water purifier more compact and enhancing the practicality of this multi-stage filtration structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings incorporated into the specification and constituting a part of the specification illustrate embodiments of the present invention and, together with the description, are used to explain the principles of the present invention. In these drawings, like reference numerals are used to represent like elements.

[0024] Figure 1 It is a schematic structural diagram of a multi-stage filtration structure and a water purifier according to an embodiment of the present invention;

[0025] Figure 2 Structural schematic diagram of a multi - stage filtration structure and the primary filter element of a water purifier according to an embodiment of the present utility model;

[0026] Figure 3 Structural schematic diagram of a multi - stage filtration structure and the secondary and tertiary filter elements of a water purifier according to an embodiment of the present utility model;

[0027] Figure 4 Structural schematic diagram of a multi - stage filtration structure and the quaternary filter element of a water purifier according to an embodiment of the present utility model.

[0028] In the figure: 1, primary filter element; 11, first housing; 111, first filtration chamber; 12, first filter screen; 2, secondary filter element; 21, second housing; 211, second filtration chamber; 22, second filter screen; 23, filter membrane; 3, tertiary filter element; 4, quaternary filter element; 41, third housing; 411, third filtration chamber; 42, third filter screen; 43, reverse osmosis membrane; 5, water storage tank; 6, water outlet pipe; 7, hose; 8, driving device. Detailed implementation manners

[0029] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art without creative efforts based on the embodiments of the present utility model belong to the scope of protection of the present utility model.

[0030] Please refer to Figures 1 to 4 , a multi - stage filtration structure according to an embodiment of the present utility model includes a primary filter element 1, a secondary filter element 2, a tertiary filter element 3 and a quaternary filter element 4. The primary filter element 1, the secondary filter element 2, the tertiary filter element 3 and the quaternary filter element 4 are connected in sequence, and water outlet ports are provided on each of the primary filter element 1, the secondary filter element 2, the tertiary filter element 3 and the quaternary filter element 4; it further includes a water storage tank 5 connected to the quaternary filter element 4, and the water storage tank 5 is used for storing the water that has been filtered successively through the primary filter element 1, the secondary filter element 2, the tertiary filter element 3 and the quaternary filter element 4.

[0031] In the present application, the multi - stage filtration structure includes a primary filter element 1, a secondary filter element 2, a tertiary filter element 3, a quaternary filter element 4 and a water storage tank 5. It can be foreseen that: there is a water input tank provided in the water purifier, the water input tank is connected to the primary filter element 1, the water storage tank 5 is connected to the quaternary filter element 4, the primary filter element 1, the secondary filter element 2, the tertiary filter element 3 and the quaternary filter element 4 are interconnected. Water is conveyed to the primary filter element 1 through the water input tank, and after being filtered successively by the primary filter element 1, the secondary filter element 2, the tertiary filter element 3 and the quaternary filter element 4, the water is conveyed to the water storage tank 5 for storage for users to use.

[0032] An embodiment of the present utility model further provides a water purifier, which includes the above multi-stage filtering structure.

[0033] In existing water purifiers, multi-stage filtering devices are mostly arranged side by side in the equipment, occupying space and having a single water outlet, with a single function and unable to efficiently discharge water according to different water usage requirements. In this application, water outlets are provided on the first-stage filter element 1, the second-stage filter element 2, the third-stage filter element 3, and the fourth-stage filter element 4. It can be foreseen that: a control module is provided in the water purifier, and through the control module, the opening and closing of the water outlets on the first-stage filter element 1, the second-stage filter element 2, the third-stage filter element 3, and the fourth-stage filter element 4 can be controlled.

[0034] Therefore, the water purifier using this multi-stage filtering structure can respectively output the water filtered by the first-stage filter element 1, the water filtered by the first-stage filter element 1 and the second-stage filter element 2, the water filtered by the first-stage filter element 1, the second-stage filter element 2, and the third-stage filter element 3, and the water filtered by the first-stage filter element 1, the second-stage filter element 2, the third-stage filter element 3, and the fourth-stage filter element 4, so that the water purifier can efficiently discharge water according to different water usage requirements, improve the water discharge efficiency of the water purifier, and enable users to freely select the filtering level and times according to actual needs, thus making the function of the water purifier more diversified and more practical.

[0035] It can be foreseen that: in specific implementation, the number of filter elements in the multi-stage filtering structure can be adjusted according to actual needs, that is to say: in this application, the multi-stage filtering structure is not limited to only including the first-stage filter element 1, the second-stage filter element 2, the third-stage filter element 3, and the fourth-stage filter element 4, and may also include a fifth-stage filter element, a sixth-stage filter element, etc., which can be specifically determined according to actual production conditions.

[0036] In this embodiment, the first-stage filter element 1 includes a first housing 11 with a first filtering chamber 111 provided therein, and a first filter screen 12 disposed in the first filtering chamber 111. The first filter screen 12 filters the water flowing through the first filtering chamber 111. In this application, the first-stage filter element 1 includes the first housing 11 and the first filter screen 12. The first housing 11 is provided with the first filtering chamber 111, and the first filter screen 12 is disposed in the first filtering chamber 111.

[0037] When the water supply tank conveys tap water to the first filtering chamber 111, the tap water flowing through the first filtering chamber 111 is filtered by the first filter screen 12, thereby realizing the microfiltration of tap water and removing various visible substances in the tap water, such as dust and impurities, etc., making the water quality cleaner. When the water outlet provided on the first housing 11 is opened, the filtered water in the first filtering chamber 111 can be output for household daily use such as washing; when the water outlet provided on the first housing 11 is closed, the filtered water in the first filtering chamber 111 is conveyed to the second-stage filter element 2.

[0038] In this embodiment, both the secondary filter element 2 and the tertiary filter element 3 include a second housing 21 with a second filtration chamber 211 provided therein, a second filter screen 22 disposed in the second filtration chamber 211, and a filtration membrane 23 disposed outside the second filter screen 22. The second filter screen 22 and the filtration membrane 23 sequentially filter the water flowing through the second filtration chamber 211. In this application, both the secondary filter element 2 and the tertiary filter element 3 include the second housing 21, the second filter screen 22, and the filtration membrane 23. The second housing 21 is provided with the second filtration chamber 211, the second filter screen 22 is disposed in the second filtration chamber 211, and the filtration membrane 23 is disposed outside the second filter screen 22.

[0039] When the water filtered by the primary filter element 1 is sequentially delivered to the second filtration chambers 211 of the secondary filter element 2 and the tertiary filter element 3, it first passes through the second filter screen 22 and the filtration membrane 23 in the secondary filter element 2 to sequentially filter the water flowing through the second filtration chamber 211 of the secondary filter element 2, and then passes through the second filter screen 22 and the filtration membrane 23 in the tertiary filter element 3 to sequentially filter the water flowing through the second filtration chamber 211 of the tertiary filter element 3, thereby achieving ultrafiltration of the water, removing chlorine and organic impurities in the water, and also absorbing the odors, colors, and smells generated by organic compounds in the water.

[0040] When the water outlet provided on the second housing 21 of the secondary filter element 2 or the tertiary filter element 3 is opened, the filtered water in the second filtration chamber 211 of the secondary filter element 2 or the tertiary filter element 3 can be output for household daily use such as cooking and washing. When the water outlet provided on the second housing 21 of the secondary filter element 2 is closed, the filtered water in the second filtration chamber 211 of the secondary filter element 2 is delivered to the second filtration chamber 211 of the tertiary filter element 3. When the water outlet provided on the second housing 21 of the tertiary filter element 3 is closed, the filtered water in the second filtration chamber 211 of the tertiary filter element 3 is delivered to the quaternary filter element 4.

[0041] In this embodiment, the quaternary filter element 4 includes a third housing 41 with a third filtration chamber 411 provided therein, a third filter screen 42 disposed in the third housing 41, and a reverse osmosis membrane 43 disposed outside the third filter screen 42. The third filter screen 42 and the reverse osmosis membrane 43 sequentially filter the water flowing through the third filtration chamber 411. In this application, the quaternary filter element 4 includes the third housing 41, the third filter screen 42, and the reverse osmosis membrane 43. The third housing 41 is provided with the third filtration chamber 411, the third filter screen 42 is disposed in the third filtration chamber 411, and the reverse osmosis membrane 43 is disposed outside the third filter screen 42.

[0042] When the water filtered by the three - stage filter element 3 is transported to the third filtration chamber 411 of the four - stage filter element 4, the water flowing through the third filtration chamber 411 is filtered successively by the third filter screen 42 and the reverse osmosis membrane 43 to remove substances such as bacteria, viruses, and spores in the water. When the water outlet provided on the third housing 41 is opened, the filtered water in the third filtration chamber 411 can be output for direct drinking; when the water outlet provided on the third housing 41 is closed, the filtered water in the third filtration chamber 411 is transported to the water storage tank 5 for storage.

[0043] In this embodiment, the first filter screen 12, the second filter screen 22, and the third filter screen 42 are all made of titanium alloy material. Since titanium alloy has good antibacterial effects and biocompatibility, compared with traditional PP and fiber filter materials, the first filter screen 12, the second filter screen 22, and the third filter screen 42 made of titanium alloy material can better improve the water quality when filtering water, thereby enhancing the filtering effect of this multi - stage filtering structure.

[0044] Furthermore, in this embodiment, the filter membranes 23 of the second - stage filter element 2 and the third - stage filter element 3 are made of graphene material. Due to the stable weather resistance, biocompatibility, safety, and antibacterial and mildew - proof properties of graphene, the filter membranes 23 made of graphene material can not only enhance the filtering effects of the second - stage filter element 2 and the third - stage filter element 3, thereby enhancing the filtering effect of the water purifier, but also extend the service lives of the second - stage filter element 2 and the third - stage filter element 3, thereby extending the service life of the water purifier, and can also ensure the water quality stability of the water purifier when it is not used for a long time.

[0045] In this embodiment, the multi - stage filtering structure further includes water outlet pipes 6 respectively provided on the first - stage filter element 1, the second - stage filter element 2, the third - stage filter element 3, and the fourth - stage filter element 4, and water outlets are formed in the water outlet pipes 6. In this application, the multi - stage filtering structure further includes multiple water outlet pipes 6, and the multiple water outlet pipes 6 are respectively arranged on the first - stage filter element 1, the second - stage filter element 2, the third - stage filter element 3, and the fourth - stage filter element 4. Thus, through the multiple water outlet pipes 6, water outlets that connect the first filtration chamber 111 with the outside are formed on the first - stage filter element 1, water outlets that connect the second filtration chamber 211 with the outside are formed on the second - stage filter element 2 and the third - stage filter element 3, and water outlets that connect the third filtration chamber 411 with the outside are formed on the fourth - stage filter element 4.

[0046] Therefore, in the present application, the control module can control the opening and closing of the water outlets on the first-stage filter element 1, the second-stage filter element 2, the third-stage filter element 3, and the fourth-stage filter element 4, enabling the water purifier to output water filtered by the first-stage filter element 1, water filtered by the first-stage filter element 1 and the second-stage filter element 2, water filtered by the first-stage filter element 1, the second-stage filter element 2, and the third-stage filter element 3, and water filtered by the first-stage filter element 1, the second-stage filter element 2, the third-stage filter element 3, and the fourth-stage filter element 4 respectively. Thus, the water purifier can efficiently output water according to different water usage requirements, improving the water output efficiency of the water purifier. Moreover, users can freely select the filtration level and number according to actual needs, making the functions of the water purifier more diverse and more practical.

[0047] In existing water purifiers, the multi-stage filtration devices are mostly arranged side by side in the equipment, occupying a large amount of space. In this embodiment, the first-stage filter element 1, the second-stage filter element 2, the third-stage filter element 3, and the fourth-stage filter element 4 are adjusted from the traditional parallel arrangement to a front-to-back connection mode, and the first-stage filter element 1, the second-stage filter element 2, the third-stage filter element 3, and the fourth-stage filter element 4 are connected in series through a hose 7. Thus, according to the required position, each stage of the filter element can be installed in the corresponding position, making the installation of this multi-stage filtration structure in the water purifier more compact and enhancing the practicality of this multi-stage filtration structure.

[0048] In this embodiment, the multi-stage filtration structure further includes a driving device 8 disposed between the third-stage filter element 3 and the fourth-stage filter element 4. The driving device 8 is used to drive the water that has been sequentially filtered by the first-stage filter element 1, the second-stage filter element 2, the third-stage filter element 3, and the fourth-stage filter element 4 to flow towards the water storage tank 5. In the present application, the multi-stage filtration structure further includes a driving device 8. The driving device 8 is arranged between the third-stage filter element 3 and the fourth-stage filter element 4. The driving device 8 drives the water to flow through the first-stage filter element 1, the second-stage filter element 2, the third-stage filter element 3, and the fourth-stage filter element 4 in sequence, and drives the water filtered by the first-stage filter element 1, the second-stage filter element 2, the third-stage filter element 3, and the fourth-stage filter element 4 to flow towards the water storage tank 5 for storage for users to use. Specifically, in actual implementation, the driving device 8 can adopt a gear pump.

[0049] The content described above can be implemented alone or in various combinations, and these variant ways are all within the protection scope of the present utility model.

[0050] It should be noted that in this text, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variation thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the element.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A multi-stage filtering structure, characterized in that: The invention comprises a primary filter element (1), a secondary filter element (2), a tertiary filter element (3) and a quaternary filter element (4); the primary filter element (1), the secondary filter element (2), the tertiary filter element (3) and the quaternary filter element (4) are connected in sequence; the primary filter element (1), the secondary filter element (2), the tertiary filter element (3) and the quaternary filter element (4) are all provided with water outlets; and the invention also comprises a water storage tank (5) connected with the quaternary filter element (4); the water storage tank (5) is used for storing water filtered by the primary filter element (1), the secondary filter element (2), the tertiary filter element (3) and the quaternary filter element (4) in sequence.

2. A multi-stage filtering structure as claimed in claim 1, characterized in that: The primary filter element (1) comprises a first housing (11) in which a first filter cavity (111) is provided, and a first filter screen (12) provided in the first filter cavity (111), wherein the first filter screen (12) filters water flowing through the first filter cavity (111).

3. A multi-stage filtering structure as claimed in claim 2, characterized in that: The secondary filter element (2) and the tertiary filter element (3) both comprise a second housing (21) having a second filter cavity (211) therein, a second filter screen (22) disposed in the second filter cavity (211), and a filter membrane (23) disposed outside the second filter screen (22), wherein the second filter screen (22) and the filter membrane (23) sequentially filter water flowing through the second filter cavity (211).

4. A multi-stage filtering structure as claimed in claim 3, characterized in that: The four-stage filter element (4) comprises a third housing (41) in which a third filter cavity (411) is provided, a third filter screen (42) provided in the third housing (41), and a reverse osmosis membrane (43) provided outside the third filter screen (42), wherein the third filter screen (42) and the reverse osmosis membrane (43) sequentially filter water flowing through the third filter cavity (411).

5. A multi-stage filtering structure as claimed in claim 4, characterized in that: The first filter screen (12), the second filter screen (22) and the third filter screen (42) are all made of titanium alloy material.

6. A multi-stage filtering structure as claimed in claim 3, characterized in that: The filter membrane (23) is made of graphene material.

7. A multi-stage filtering structure as claimed in claim 1, characterized in that: The multi-stage filtering structure further comprises water outlet pipes (6) respectively arranged on the primary filter element (1), the secondary filter element (2), the tertiary filter element (3) and the quaternary filter element (4), and the water outlet is formed in the water outlet pipes (6).

8. A multi-stage filtering structure as claimed in claim 1, characterized in that: The primary filter element (1), the secondary filter element (2), the tertiary filter element (3) and the quaternary filter element (4) are connected in series via a hose (7).

9. A multi-stage filtering structure as claimed in claim 1, characterized in that: The multi-stage filtering structure further comprises a driving device (8) arranged between the third-stage filter element (3) and the fourth-stage filter element (4), the driving device (8) being used to drive the water filtered by the first-stage filter element (1), the second-stage filter element (2), the third-stage filter element (3) and the fourth-stage filter element (4) in sequence to flow toward the water storage tank (5).

10. A water purifier, characterized in that: It comprises the multi-stage filtering structure as claimed in any one of claims 1 to 9.

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