Composite filter element and water purifier

Abstract

The invention relates to the technical field of water drinking devices, and particularly provides a composite filter element and a water purifier. The composite filter element comprises a first shell, a front filter assembly, a rear filter assembly and a reverse osmosis filter assembly, the reverse osmosis filtering assembly comprises a water permeable pipe and a reverse osmosis membrane; the front filtering assembly comprises a first core material and a second shell, the second shell is provided with an annular cavity and a hollow cavity, and the first core material is located in the annular cavity; the rear filtering assembly comprises a second core material and a first supporting pipe, and the second core material is located in the water permeable pipe; the second shell and the reverse osmosis membrane abut against each other in parallel in the axial direction of the first shell, and the other end of the first supporting pipe communicates with the water outlet end of the second core material and supports and fixes the second core material. The reverse osmosis membrane and the second shell are axially arranged in parallel, and the second core material is supported and fixed in the water permeable pipe by the first supporting pipe, so that the internal structure of the filter element is reasonably and effectively utilized, the integration level of a filter assembly in the composite filter element is improved, and the size of the composite filter element is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of drinking water devices, and particularly provides a composite filter element and a water purifier. BACKGROUND

[0002] The existing water purifier usually adopts two or three filter elements of a front filter element, a reverse osmosis filter element and a rear filter element to realize the water purification function.

[0003] The above multiple filter elements in the water purifier are usually arranged and installed separately, so that the filter elements not only excessively occupy the internal space of the machine, but also cause the water purifier to be large and heavy in size, which is not conducive to the miniaturization design of the water purifier and the user experience is poor.

[0004] Correspondingly, there is a need for a new composite filter element to solve the above problems. SUMMARY

[0005] In order to solve the above problems in the prior art, that is, to solve the problem of filter element occupying the internal space of the machine in the existing water purifier.

[0006] In a first aspect, the present application provides a composite filter element, comprising a first shell and a front filter assembly, a rear filter assembly and a reverse osmosis filter assembly located in the first shell,

[0007] One end of the first shell is provided with a first water inlet, a second water inlet, a third water inlet, a fourth water inlet and a fifth water inlet;

[0008] The first water inlet and the second water inlet are respectively communicated with the water inlet side and the water outlet side of the front filter assembly;

[0009] The first gap flow channel is formed between the front filter assembly and the inner wall of the first shell, and the two ends of the first gap flow channel are respectively communicated with the third water inlet and the water inlet side of the reverse osmosis filter assembly;

[0010] The reverse osmosis filter assembly and the front filter assembly are distributed along the axial direction of the first shell and are sleeved on the rear filter assembly, the water outlet side of the reverse osmosis filter assembly is communicated with the water inlet side of the rear filter assembly, the water outlet side of the rear filter assembly is communicated with the fourth water inlet, and the concentrated water end of the reverse osmosis filter assembly is communicated with the fifth water inlet.

[0011] In the preferred technical solution of the composite filter element, the post-filter assembly comprises a second core material and a first support pipe, the reverse osmosis filter assembly is sleeved on the second core material, one end of the first support pipe communicates with the fourth water outlet through the pre-filter assembly, the other end of the first support pipe communicates with the water outlet end of the second core material and supports and fixes the second core material, and a second gap flow channel is formed between the outer wall of the first support pipe and the inner wall of the pre-filter assembly, and the two ends of the second gap flow channel respectively communicate with the concentrated water end of the reverse osmosis filter assembly and the fifth water outlet.

[0012] In the preferred technical solution of the composite filter element, the pre-filter assembly comprises a first core material and a second shell, the second shell has an annular chamber and a hollow chamber which are isolated from each other, and the first core material is located in the annular chamber; a third gap flow channel which communicates with the first water outlet is formed between the water inlet side of the first core material and the inner wall of the annular chamber, a fourth gap flow channel which communicates with the second water outlet is formed between the water outlet side of the first core material and the outer wall of the hollow chamber, the first gap flow channel is formed between the outer wall of the second shell and the inner wall of the first shell, the first support pipe is located in the hollow chamber, and the second gap flow channel is formed between the outer wall of the first support pipe and the inner wall of the hollow chamber; and / or

[0013] The reverse osmosis filter assembly comprises a water permeable pipe and a reverse osmosis membrane wound on the water permeable pipe, and the second core material is arranged in the water permeable pipe, and a fifth gap flow channel is formed between the water inlet side of the second core material and the inner wall of the water permeable pipe.

[0014] In the preferred technical solution of the composite filter element, the second shell comprises a second support pipe and a cylindrical shell sleeved outside the second support pipe, one end of the second support pipe is sealingly connected with one end of the cylindrical shell, the end of the second support pipe also supports the end of the reverse osmosis membrane, the annular chamber is formed between the inner wall of the cylindrical shell and the outer wall of the second support pipe, the hollow chamber is a cavity of the second support pipe, and the second gap flow channel is formed between the inner wall of the second support pipe and the outer wall of the first support pipe.

[0015] In the preferred technical solution of the composite filter element, the pre-filter assembly further comprises a first annular end cover and a second annular end cover located in the annular chamber, and the first annular end cover and the second annular end cover clamp and fix the first core material.

[0016] In the case of the preferred technical solution of the composite filter element described above, the first core material comprises a PP cotton core layer on the outer side and a carbon core layer on the inner side, the third gap flow channel is formed between the PP cotton core layer and the inner wall of the cylindrical shell, and the fourth gap flow channel is formed between the inner wall of the carbon core layer and the outer wall of the second support pipe; and / or

[0017] The second core material comprises a cylindrical carbon rod, and the fifth gap flow channel is formed between the outer wall of the cylindrical carbon rod and the inner wall of the water permeable pipe, and the cavity of the cylindrical carbon rod is in communication with one end of the first support pipe.

[0018] In the case of the preferred technical solution of the composite filter element described above, the first support pipe is formed with an annular flange at one end, and the annular flange radially fixes the end of the second core material.

[0019] In the case of the preferred technical solution of the composite filter element described above, one end of the first support pipe is sealingly connected to one end of the water permeable pipe.

[0020] In the case of the preferred technical solution of the composite filter element described above, the first shell comprises a cylindrical body and a handle cover sealingly connected to one end of the cylindrical body, and the first water inlet, the second water inlet, the third water inlet, the fourth water inlet and the fifth water inlet are all located at the other end of the cylindrical body.

[0021] In a second aspect, the present application further provides a water purifier comprising the composite filter element.

[0022] Those skilled in the art will understand that the composite filter element of the present invention includes a first housing and a pre-filter assembly, a post-filter assembly, and a reverse osmosis filter assembly located within the first housing. One end of the first housing is provided with a first water inlet, a second water inlet, a third water inlet, a fourth water inlet, and a fifth water inlet. The reverse osmosis filter assembly includes a permeable pipe and a reverse osmosis membrane wound around the permeable pipe. The pre-filter assembly includes a first core material and a second housing, the second housing having an annular chamber and a hollow chamber isolated from each other, the first core material located within the annular chamber. The post-filter assembly includes a second core material and a first support tube, the second core material located within the permeable pipe. The first... The two housings and the reverse osmosis membrane are arranged side-by-side and abut against each other along the axial direction of the first housing. The annular chamber of the second housing is connected to the first and second water inlets. A first gap channel is formed between the outer wall of the second housing and the inner wall of the first housing, and the first gap channel is connected to the inlet end of the reverse osmosis membrane and the third water inlet. One end of the first support tube passes through the hollow chamber and is connected to the fourth water inlet, and the other end of the first support tube is connected to the outlet end of the second core material and supports and fixes the second core material. A second gap channel is formed between the outer wall of the first support tube and the inner wall of the hollow chamber, and the second gap channel is connected to the concentrate end of the reverse osmosis membrane and the fifth water inlet. With this arrangement, the reverse osmosis membrane and the second housing are axially connected in parallel within the first housing. At the same time, the first support tube passes through the second housing and firmly supports the second core material inside the permeate pipe. This layout structure not only effectively utilizes the internal structural space of the filter element, but also reduces the number of filter elements, making the overall structure of the composite filter element more compact and small, improving the integration of the filtration components within the composite filter element. Furthermore, this structure is easy to assemble and has low cost.

[0023] Furthermore, one end of the first support tube has an annular flange, which radially fixes the end of the second core material. This design prevents the second core material from shifting radially due to external forces, thus maintaining the stability of the second core material within the permeable pipe.

[0024] Furthermore, one end of the first support tube is sealed to one end of the permeate tube. This design prevents concentrated water from the concentrate end of the reverse osmosis membrane from seeping into the space between the inner wall of the permeate tube and the outer wall of the second core material through the gap between the ends of the first support tube and the permeate tube, thus ensuring the quality of the water output from the composite filter element.

[0025] Furthermore, the water purifier provided by the present invention, based on the above technical solution, has the same technical effects as the composite filter element because it uses the above composite filter element. Compared with existing water purifiers, the water purifier of the present invention has a high degree of integration and a small size in the composite filter element, which improves the user experience. Attached Figure Description

[0026] The preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:

[0027] Figure 1 This is a schematic diagram of the axial cross-sectional structure of the composite filter element of the present invention;

[0028] Figure 2 This is a schematic diagram of the water flow direction within the reverse osmosis filtration component and the post-filtration component in the composite filter element of the present invention;

[0029] Figure 3 This is a schematic diagram of the water flow direction within the pre-filter assembly of the composite filter element of the present invention.

[0030] List of reference numerals in the attached diagram:

[0031] 1. First shell; 10. Cylindrical body; 11. First water inlet; 12. Second water inlet; 13. Third water inlet; 14. Fourth water inlet; 15. Fifth water inlet; 16. Handle cover; 21. PP cotton core layer; 22. Carbon core layer; 23. Cylindrical shell; 24. Second support tube; 25. First annular end cap; 26. Second annular end cap; 31. Reverse osmosis membrane; 32. Water permeation pipe; 321. Through hole; 4. Second core material; 5. First support tube; 61. Third gap flow channel; 62. Fourth gap flow channel; 63. First gap flow channel; 64. Second gap flow channel; 65. Fifth gap flow channel. Detailed Implementation

[0032] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0033] It should be noted that in the description of this invention, terms such as "upper," "lower," "inner," "outer," "top," and "bottom," which indicate direction or positional relationship, are based on the direction or positional relationship shown in the accompanying drawings. This is merely for ease of description and does not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0034] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; or they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances. In addition, the terms "first," "second," "third," "fourth," and "fifth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0035] Based on the background art, this invention addresses the issue of filter cartridges occupying internal space in existing water purifiers. It provides a composite filter cartridge that integrates a pre-filter, a reverse osmosis filter, and a post-filter into a single unit. By effectively utilizing the internal structure of each filter component, the number and volume of filter cartridges in the water purifier are reduced, thus improving the user experience.

[0036] Specifically, such as Figure 1 , Figure 2 as well as Figure 3 As shown, the composite filter element of the present invention includes a first housing 1 and a pre-filter assembly, a post-filter assembly, and a reverse osmosis filter assembly located within the first housing 1. The lower end of the first housing 1 is provided with a first water inlet 11, a second water inlet 12, a third water inlet 13, a fourth water inlet 14, and a fifth water inlet 15.

[0037] The first inlet 11 and the second inlet 12 are respectively connected to the inlet and outlet of the pre-filter assembly; a first gap channel 63 is formed between the pre-filter assembly and the inner wall of the first housing 1, and the two ends of the first gap channel 63 are respectively connected to the third inlet 13 and the inlet of the reverse osmosis filter assembly; the reverse osmosis filter assembly and the pre-filter assembly are distributed along the axial direction of the first housing 1, the reverse osmosis filter assembly is sleeved on the post-filter assembly, the outlet of the reverse osmosis filter assembly is connected to the inlet of the post-filter assembly, the outlet of the post-filter assembly is connected to the fourth inlet 14, and the concentrate end of the reverse osmosis filter assembly is connected to the fifth inlet 15.

[0038] For example, such as Figure 1 As shown, the first housing 1 of the composite filter element of the present invention includes a cylindrical body 10 and a handle cover 16, and the handle cover 16 is sealed to the upper end of the cylindrical body 10. The first water inlet 11, the second water inlet 12, the third water inlet 13, the fourth water inlet 14 and the fifth water inlet 15 are all located at the bottom of the cylindrical body 10.

[0039] Preferably, such as Figures 1 to 3 As shown, the reverse osmosis filtration component in the composite filter element of the present invention includes a reverse osmosis membrane 31 and a water permeation pipe 32. The reverse osmosis membrane 31 is circumferentially wound around the outer wall of the water permeation pipe 32, and the circumferential wall of the water permeation pipe 32 is provided with multiple through holes 321. The upper end of the water permeation pipe 32 is in a blocked state.

[0040] Preferably, such as Figures 1 to 3 As shown, the pre-filter assembly in the composite filter element of the present invention includes a first core material 21, 22 and a second housing 23, 24. The second housing 23, 24 has an annular chamber and a hollow chamber that are isolated from each other. The first core material 21, 22 is located in the annular chamber. The first core material 21, 22 includes an outer PP cotton core layer 21 and an inner carbon core layer 22.

[0041] Preferably, such as Figures 1 to 3 As shown, the post-filtration component in the composite filter element of the present invention includes a second core material 4 and a first support tube 5. The second core material 4 is located inside the water permeable tube 32 of the reverse osmosis filter element, and the second core material 4 is a cylindrical carbon rod.

[0042] Preferably, such as Figures 1 to 3 As shown, after the pre-filter assembly, post-filter assembly, and reverse osmosis filter assembly are sequentially installed into the cylindrical body 10, the second housings 23 and 24 and the reverse osmosis membrane 31 are arranged side by side and abut against each other along the axial direction of the first housing 1. The annular chambers in the second housings 23 and 24 are respectively connected to the first water inlet 11 and the second water inlet 12 on the first housing 1. The lower end of the first support tube 5 passes through the hollow chamber of the second housings 23 and 24 and is connected to the fourth water inlet 14 on the first housing 1. The permeable tube 32 of the reverse osmosis filter assembly is sleeved on the outside of the second core material 4 so that the second core material 4 is located in the chamber of the permeable tube 32. The upper side of the second core material 4 abuts against the inner side of the permeable tube 32. The lower water outlet end of the second core material 4 is supported and fixed by the upper end of the first support tube 5 and is connected to the first support tube 5. A first gap channel 63 is formed between the outer wall of the second shell 23 and 24 and the inner wall of the first shell 1. The first gap channel 63 is connected to the water inlet of the reverse osmosis membrane 31 and the third water inlet 13 on the first shell 1. A second gap channel 64 is formed between the outer wall of the first support tube 5 and the inner wall of the hollow cavity of the second shell 23 and 24. The second gap channel 64 is connected to the concentrate end of the reverse osmosis membrane 31 and the fifth water inlet 15 on the first shell 1.

[0043] Preferably, such as Figure 1 As shown, the second housings 23 and 24 in the composite filter element of the present invention include a cylindrical housing 23 and a second support tube 24. The cylindrical housing 23 is sleeved on the outside of the second support tube 24. One end of the second support tube 24 is sealed to one end of the cylindrical housing 23. One end of the second support tube 24 also supports the end of the reverse osmosis membrane 31. The annular chambers in the second housings 23 and 24 are formed between the inner wall of the cylindrical housing 23 and the outer wall of the second support tube 24. The hollow chambers in the second housings 23 and 24 are the chambers of the second support tube 24. The second gap flow channel 64 is formed between the inner wall of the second support tube 24 and the outer wall of the first support tube 5. The pre-filter assembly also includes a first annular end cap 25 and a second annular end cap 26 located in the annular chambers of the second housings 23 and 24. The first annular end cap 25 and the second annular end cap 26 clamp and fix the first core materials 21 and 22.

[0044] For example, such as Figure 1As shown, the upper end of the second support tube 24 has a radially extending annular edge. The lower side of the annular edge of the second support tube 24 covers the opening at the upper end of the cylindrical shell 23 and is fixed by fusion welding. The annular edge of the second support tube 24 is used to support and radially fix the reverse osmosis filter assembly.

[0045] Specifically, such as Figure 1 As shown, during the assembly of the composite filter element, the cylindrical housing 23 of the pre-filter assembly is fixed inside the first housing 1. Then, the second annular end cap 26, the first core materials 21 and 22, and the first annular end cap 25 are sequentially placed into the cylindrical housing 23. The lower end of the second support tube 24 is then sequentially passed through the first annular end cap 25, the first core materials 21 and 22, and the second annular end cap 26 and fixed onto the first housing 1. The annular edge of the upper end of the second support tube 24 is sealed and connected to the edge of the upper opening of the cylindrical housing 23. Thus, the first annular end cap 25, the first core materials 21 and 22, and the second annular end cap 26 are all fixed in the annular chambers inside the second housings 23 and 24, completing the installation of the pre-filter assembly in the first housing 1.

[0046] It should be noted that a third gap channel 61 is formed between the PP cotton core layer 21 and the inner wall of the cylindrical shell 23 in the first core material 21 and 22, which communicates with the first water inlet 11 on the first shell 1. A fourth gap channel 62 is formed between the inner wall of the carbon core layer 22 in the first core material 21 and 22 and the outer wall of the second support tube 24, which communicates with the second water inlet 12 on the first shell 1.

[0047] Understandably, when installed, the reverse osmosis membrane 31 is clamped and fixed between the second support tube 24 and the handle cover 16.

[0048] This design improves the ease of installation and removal of the pre-filter assembly within the first housing 1. Furthermore, the reverse osmosis membrane 31 is supported and fixed within the first housing 1 by the second support tube 24 in the second housings 23 and 24, avoiding the introduction of excessive support fasteners and reducing the number of components within the composite filter element.

[0049] It should be noted that, depending on the actual application, those skilled in the art can construct the second housings 23 and 24 as a double-layered sleeve-type integral structure to form an annular chamber and a hollow chamber. Alternatively, the second housings 23 and 24 can be constructed as a nested combination structure of an outer shell and an inner shell to form an annular chamber and a hollow chamber. Such flexible adjustments and changes to the specific structural settings of the second housings 23 and 24 do not deviate from the basic principles and scope of the present invention and should all be limited to the protection scope of the present invention.

[0050] Preferably, such as Figure 1As shown, the upper end of the first support tube 5 has an upward-facing annular flange, which radially fixes the bottom of the second core material 4.

[0051] When the second core material 4 is clamped and fixed inside the permeable pipe 32, the annular flange of the first support pipe 5 is fastened to the bottom of the second core material 4 to ensure the stability of the second core material 4 inside the permeable pipe 32. A fifth gap channel 65 is formed between the outer wall of the second core material 4 and the inner wall of the permeable pipe 32, and the chamber of the second core material 4 is connected to the upper end of the first support pipe 5.

[0052] It should be noted that the annular flange at the upper end of the first support tube 5 covers and seals the opening of the permeable tube 32. This prevents concentrated water filtered by the reverse osmosis membrane 31 from entering the fifth gap channel 65 through the gap between the annular flange of the first support tube 5 and the inner wall of the permeable tube 32, thus reducing the quality of the water filtered by the composite filter element.

[0053] like Figure 1 As shown, the first gap channel 63 also extends between the outer wall of the reverse osmosis membrane 31 and the inner wall of the first housing 1. That is, the outer wall of the reverse osmosis membrane 31 and the inner wall of the first housing 1 are spaced apart. When water flows through the third water inlet 13 and enters the first gap channel 63, the water can surround the surface of the reverse osmosis membrane 31 and flow radially to filter the water.

[0054] like Figure 2 As shown, when the composite filter cartridge is connected to the water system, the pre-filter component of the composite filter cartridge performs primary filtration on the water flow from the water system.

[0055] Specifically, such as Figure 2 As shown, the tap water in the water system enters the third gap flow channel 61 through the first water inlet 11 on the first housing 1 and flows evenly to the outside of the PP cotton core layer 21. Under the action of water pressure, the tap water passes through the PP cotton core layer 21 and the carbon core layer 22 in sequence along the radial direction of the first core material 21 and 22 to obtain the primary filtered water. The primary filtered water is collected by the fourth gap flow channel 62 and flows to the second water inlet 12, and enters the water system.

[0056] like Figure 3 As shown, when the initially filtered water re-enters the composite filter cartridge through the water system, the reverse osmosis filtration component and the post-filtration component in the composite filter cartridge further filter the initially filtered water.

[0057] Specifically, such as Figure 3As shown, the first filtered water enters the first gap channel 63 through the third inlet 13 on the first housing 1. That is, the first filtered water is dispersed to the outer end of the reverse osmosis membrane 31 through the outer side of the cylindrical housing 23 of the second housings 23 and 24. Under water pressure, the first filtered water permeates radially along the reverse osmosis membrane 31 to form secondary filtered water. The secondary filtered water collects in the fifth gap channel 65 through the through-hole 321 on the permeate pipe 32. The secondary filtered water surrounds the outer side of the second core material 4 and continues to permeate and filter radially along the second core material 4 to obtain tertiary filtered water. The tertiary filtered water collects in the cavity of the second core material 4 and flows to the fourth inlet 14 on the first housing 1 via the first support pipe 5, thus producing pure water from the composite filter element. Furthermore, water filtered by the reverse osmosis membrane 31 that does not enter the fifth gap channel 65 forms concentrated water. The concentrated water flows along the second gap channel 64 to the fifth inlet 15 on the first housing 1 and is discharged as wastewater.

[0058] Finally, the present invention also provides a water purifier comprising the above-mentioned composite filter element.

[0059] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A composite filter element, characterized in that, It includes a first housing (1) and a pre-filter assembly, a post-filter assembly, and a reverse osmosis filter assembly located within the first housing (1). The first housing (1) is provided with a first water inlet (11), a second water inlet (12), a third water inlet (13), a fourth water inlet (14) and a fifth water inlet (15) at one end; The first water inlet (11) and the second water inlet (12) are respectively connected to the water inlet side and the water outlet side of the pre-filter assembly; A first gap channel (63) is formed between the pre-filter assembly and the inner wall of the first housing (1), and the two ends of the first gap channel (63) are respectively connected to the third water inlet (13) and the water inlet side of the reverse osmosis filter assembly. The reverse osmosis filter assembly and the pre-filter assembly are distributed along the axial direction of the first housing (1) and sleeved on the post-filter assembly. The outlet side of the reverse osmosis filter assembly is connected to the inlet side of the post-filter assembly. The outlet side of the post-filter assembly is connected to the fourth water inlet (14). The concentrate end of the reverse osmosis filter assembly is connected to the fifth water inlet (15).

2. The composite filter element according to claim 1, characterized in that, The post-filter assembly includes a second core material (4) and a first support tube (5). The reverse osmosis filter assembly is sleeved on the second core material (4). One end of the first support tube (5) passes through the pre-filter assembly and communicates with the fourth water inlet (14). The other end of the first support tube (5) communicates with the water outlet of the second core material (4) and supports and fixes the second core material (4). A second gap channel (64) is formed between the outer wall of the first support tube (5) and the inner wall of the pre-filter assembly. The two ends of the second gap channel (64) are respectively connected to the concentrate end of the reverse osmosis filter assembly and the fifth water inlet (15).

3. The composite filter element according to claim 2, characterized in that, The pre-filter assembly includes a first core material (21, 22) and a second housing (23, 24). The second housing (23, 24) has an annular chamber and a hollow chamber that are isolated from each other. The first core material (21, 22) is located in the annular chamber. A third gap channel (61) communicating with the first water inlet (11) is formed between the water inlet side of the first core material (21, 22) and the inner wall of the annular chamber. A fourth gap channel (62) communicating with the second water inlet (12) is formed between the water outlet side of the first core material (21, 22) and the outer wall of the hollow chamber. The first gap channel (63) is formed between the outer wall of the second housing (23, 24) and the inner wall of the first housing (1). The first support tube (5) is located in the hollow chamber. A second gap channel (64) is formed between the outer wall of the first support tube (5) and the inner wall of the hollow chamber. And / or The reverse osmosis filtration assembly includes a permeable pipe (32) and a reverse osmosis membrane (31) wound on the permeable pipe (32). The second core material (4) is disposed inside the permeable pipe (32), and a fifth gap channel (65) is formed between the water inlet side of the second core material (4) and the inner wall of the permeable pipe (32).

4. The composite filter element according to claim 3, characterized in that, The second housing (23, 24) includes a second support tube (24) and a cylindrical housing (23) sleeved on the outside of the second support tube (24). One end of the second support tube (24) is sealed to one end of the cylindrical housing (23). One end of the second support tube (24) also supports the end of the reverse osmosis membrane (31). The annular chamber is formed between the inner wall of the cylindrical housing (23) and the outer wall of the second support tube (24). The hollow chamber is the chamber of the second support tube (24). The second gap flow channel (64) is formed between the inner wall of the second support tube (24) and the outer wall of the first support tube (5).

5. The composite filter element according to claim 3, characterized in that, The pre-filter assembly also includes a first annular end cap (25) and a second annular end cap (26) located in the annular chamber, wherein the first annular end cap (25) and the second annular end cap (26) clamp and fix the first core material (21, 22).

6. The composite filter element according to claim 4, characterized in that, The first core material (21, 22) includes an outer PP cotton core layer (21) and an inner carbon core layer (22). The PP cotton core layer (21) forms the third gap channel (61) between itself and the inner wall of the cylindrical shell (23), and the inner wall of the carbon core layer (22) forms the fourth gap channel (62) between itself and the outer wall of the second support tube (24); and / or The second core material (4) includes a cylindrical carbon rod, and the outer wall of the cylindrical carbon rod forms the fifth gap channel (65) between the inner wall of the water-permeable pipe (32). The chamber of the cylindrical carbon rod is connected to one end of the first support pipe (5).

7. The composite filter element according to claim 2, characterized in that, One end of the first support tube (5) is formed with an annular flange, which radially fixes the end of the second core material (4).

8. The composite filter element according to claim 3, characterized in that, One end of the first support pipe (5) is sealed to one end of the permeable pipe (32).

9. The composite filter element according to any one of claims 1 to 8, characterized in that, The first housing (1) includes a cylindrical body (10) and a handle cover (16) that is sealed to one end of the cylindrical body (10). The first water inlet (11), the second water inlet (12), the third water inlet (13), the fourth water inlet (14) and the fifth water inlet (15) are all located at the other end of the cylindrical body (10).

10. A water purifier, characterized in that, The composite filter element includes any one of claims 1 to 9.

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