Composite filter element and water purifier

Abstract

The utility model 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 utility model relates to the technical field of drinking water devices, and specifically provides a composite filter element and a water purifier. Background Art

[0002] Existing water purifiers usually use two or three filter elements among a pre-filter element, a reverse osmosis filter element and a post-filter element to achieve the water purification function.

[0003] The above-mentioned multiple filter elements in the water purifier are usually installed separately, which not only occupies too much internal space of the machine, but also makes the water purifier larger and bulky, which is not conducive to the miniaturization design of the water purifier and the user experience is not good.

[0004] Accordingly, the art needs a new composite filter element to solve the above problems. Utility Model Content

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

[0006] In a first aspect, the utility model provides a composite filter element, comprising a first housing and a pre-filter component, a post-filter component and a reverse osmosis filter component located in the first housing.

[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 connected to the water inlet side and the water outlet side of the pre-filter assembly;

[0009] A first gap flow channel is formed between the pre-filter assembly and the inner wall of the first shell, and two ends of the first gap flow channel are respectively connected to the third water inlet and the water inlet side of the reverse osmosis filter assembly;

[0010] The reverse osmosis filter assembly and the pre-filter assembly are distributed along the axial direction of the first shell and are sleeved on the post-filter assembly. The water outlet side of the reverse osmosis filter assembly is connected to the water inlet side of the post-filter assembly, the water outlet side of the post-filter assembly is connected to the fourth water inlet, and the concentrated water end of the reverse osmosis filter assembly is connected to the fifth water inlet.

[0011] In the case of the preferred technical solution of the above-mentioned composite filter element, the post-filter component includes a second core material and a first support tube, the reverse osmosis filter component is sleeved on the second core material, one end of the first support tube passes through the pre-filter component and is connected to the fourth water inlet, the other end of the first support tube is connected to the water outlet end of the second core material and supports and fixes the second core material, a second gap flow channel is formed between the outer wall of the first support tube and the inner wall of the pre-filter component, and the two ends of the second gap flow channel are respectively connected to the concentrated water end of the reverse osmosis filter component and the fifth water inlet.

[0012] In the case of the preferred technical solution of the above-mentioned composite filter element, the pre-filter assembly includes a first core material and a second shell, the second shell has an annular chamber and a hollow chamber isolated from each other, the first core material is located in the annular chamber; a third gap flow channel connected to the first water receiving port 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 connected to the second water receiving port 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 tube is located in the hollow chamber, and the second gap flow channel is formed between the outer wall of the first support tube and the inner wall of the hollow chamber; and / or

[0013] The reverse osmosis filtration component includes a water permeable pipe and a reverse osmosis membrane wound on the water permeable pipe. 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 case of the preferred technical solution of the above-mentioned composite filter element, the second shell includes a second support tube and a cylindrical shell sleeved on the outside of the second support tube, one end of the second support tube is sealed and connected to one end of the cylindrical shell, and one end of the second support tube also supports against 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 tube, the hollow chamber is the chamber of the second support tube, and the second gap flow channel is formed between the inner wall of the second support tube and the outer wall of the first support tube.

[0015] In the case of the preferred technical solution of the above-mentioned composite filter element, the pre-filter assembly also includes 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 includes an outer PP cotton core layer and an inner carbon core layer, 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 tube; and / or

[0017] The second core material includes a cylindrical carbon rod, the fifth gap flow channel is formed between the outer wall of the cylindrical carbon rod and the inner wall of the water-permeable tube, and the chamber of the cylindrical carbon rod is connected to one end of the first support tube.

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

[0019] In the case of the preferred technical solution of the above-mentioned composite filter element, one end of the first support tube is sealed and connected to one end of the water-permeable tube.

[0020] In the case of the preferred technical solution of the above-mentioned composite filter element, the first shell includes a cylindrical body and a handle cover sealed 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 utility model also provides a water purifier, which includes the composite filter element.

[0022] Those skilled in the art can understand that the composite filter element of the present invention includes a first shell and a pre-filter assembly, a post-filter assembly and a reverse osmosis filter assembly located in the first shell, 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; the reverse osmosis filter assembly includes a water permeable pipe and a reverse osmosis membrane wound on the water permeable pipe; the pre-filter assembly includes a first core material and a second shell, the second shell has an annular chamber and a hollow chamber isolated from each other, and the first core material is located in the annular chamber; the post-filter assembly includes a second core material and a first support tube, and the second core material is located in the water permeable pipe; wherein, The second shell and the reverse osmosis membrane are arranged side by side and against each other along the axial direction of the first shell, the annular chamber of the second shell is respectively connected with the first water inlet and the second water inlet, a first gap flow channel is formed between the outer wall of the second shell and the inner wall of the first shell, the first gap flow channel is respectively connected with the water inlet end and the third water inlet of the reverse osmosis membrane, one end of the first support tube passes through the hollow chamber and is connected with the fourth water inlet, the other end of the first support tube is connected with the water outlet end of the second core material and supports and fixes the second core material, a second gap flow channel is formed between the outer wall of the first support tube and the inner wall of the hollow chamber, the second gap flow channel is respectively connected with the concentrated water end and the fifth water inlet of the reverse osmosis membrane. Through such an arrangement, the reverse osmosis membrane and the second shell are axially arranged in parallel in the first shell, and the first support tube passes through the second shell and firmly supports the second core material in the water permeable 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 compact, improving the integration of the filter assembly in the composite filter element, and the structure is easy to assemble and low in cost.

[0023] Furthermore, an annular flange is formed at one end of the first support tube, and the annular flange radially fixes the end of the second core material. Through such an arrangement, the second core material is prevented from being displaced in the radial direction by external force, and the stability of the second core material in the water-permeable pipe is maintained.

[0024] Furthermore, one end of the first support tube is sealed and connected to one end of the water permeable tube. This arrangement prevents the concentrated water at the concentrated water end of the reverse osmosis membrane from penetrating into the space between the inner wall of the water permeable tube and the outer wall of the second core material through the gap between the ends of the first support tube and the water permeable tube, thereby ensuring the water quality of the composite filter element.

[0025] In addition, the water purifier further provided by the utility model on the basis of the above-mentioned technical solution has the technical effects possessed by the above-mentioned composite filter element because it adopts the above-mentioned composite filter element. Compared with the existing water purifiers, the filter components in the composite filter element of the water purifier of the utility model are highly integrated and compact, thereby improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The preferred embodiments of the present invention are described below in conjunction with 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 utility model;

[0028] Figure 2 It is a schematic diagram of the water flow direction in the reverse osmosis filter component and the post-filter component in the composite filter element of the utility model;

[0029] Figure 3 It is a schematic diagram of the water flow direction in the pre-filter component of the composite filter element of the utility model.

[0030] List of reference numerals:

[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 cover; 26. Second annular end cover; 31. Reverse osmosis membrane; 32. Water-permeable tube; 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 DESCRIPTION

[0032] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0033] It should be noted that, in the description of the present invention, terms such as "upper", "lower", "inside", "outside", "top", and "bottom" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is only for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0034] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, or it can be a connection between the two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. In addition, the terms "first", "second", "third", "fourth", and "fifth" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0035] Based on the problem of filter elements occupying the internal space of the machine pointed out in the background technology, the utility model provides a composite filter element, which aims to integrate the pre-filter component, the reverse osmosis filter component and the post-filter component into an integrated filter element, and reduces the number and volume of filter elements in the water purifier by reasonably and effectively utilizing the internal structure of each filter component, thereby improving the user experience.

[0036] Specifically, Figure 1 , Figure 2 as well as Figure 3 As shown, the composite filter element of the utility model comprises a first housing 1 and a pre-filter assembly, a post-filter assembly and a reverse osmosis filter assembly located in 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] Among them, 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 component; a first gap flow channel 63 is formed between the pre-filter component and the inner wall of the first shell 1, and the two ends of the first gap flow channel 63 are respectively connected to the third water inlet 13 and the water inlet side of the reverse osmosis filter component; the reverse osmosis filter component and the pre-filter component are distributed along the axial direction of the first shell 1, the reverse osmosis filter component is sleeved on the post-filter component, the water outlet side of the reverse osmosis filter component is connected to the water inlet side of the post-filter component, the water outlet side of the post-filter component is connected to the fourth water inlet 14, and the concentrated water end of the reverse osmosis filter component is connected to the fifth water inlet 15.

[0038] For example, Figure 1 As shown, the first housing 1 in the composite filter element of the utility model comprises a cylindrical body 10 and a handle cover 16, and the handle cover 16 is sealed and connected to the upper end of the cylindrical body 10. Among them, 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, if Figures 1 to 3 As shown, the reverse osmosis filtration component in the composite filter element of the utility model includes a reverse osmosis membrane 31 and a water permeable pipe 32. The reverse osmosis membrane 31 is circumferentially wound on the outer wall of the water permeable pipe 32, and a plurality of through holes 321 are provided on the circumferential wall of the water permeable pipe 32. The upper end of the water permeable pipe 32 is in a blocked state.

[0040] Preferably, if Figures 1 to 3As shown, the pre-filter assembly in the composite filter element of the utility model includes a first core material 21, 22 and a second shell 23, 24, the second shell 23, 24 has an annular chamber and a hollow chamber isolated from each other, the first core materials 21, 22 are located in the annular chamber, and the first core materials 21, 22 include an outer PP cotton core layer 21 and an inner carbon core layer 22.

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

[0042] Preferably, if Figures 1 to 3 As shown, after the pre-filter assembly, the post-filter assembly and the reverse osmosis filter assembly are sequentially installed in the cylindrical body 10, the second shell 23, 24 and the reverse osmosis membrane 31 are arranged side by side along the axial direction of the first shell 1 and are placed against each other up and down. The annular chambers in the second shells 23, 24 are respectively connected to the first water inlet 11 and the second water inlet 12 on the first shell 1. The lower end of the first support tube 5 passes through the hollow chamber of the second shell 23, 24 and is connected to the fourth water inlet 14 on the first shell 1. The water-permeable pipe 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 water-permeable pipe 32. The upper side of the second core material 4 is against the inner side of the water-permeable pipe 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 flow channel 63 is formed between the outer wall of the second shell 23, 24 and the inner wall of the first shell 1, and the first gap flow channel 63 is respectively connected to the water inlet end of the reverse osmosis membrane 31 and the third water receiving port 13 on the first shell 1. A second gap flow channel 64 is formed between the outer wall of the first support tube 5 and the inner wall of the hollow chamber of the second shell 23, 24, and the second gap flow channel 64 is respectively connected to the concentrated water end of the reverse osmosis membrane 31 and the fifth water receiving port 15 on the first shell 1.

[0043] Preferably, if Figure 1As shown, the second housing 23, 24 in the composite filter element of the utility model includes 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 and connected to one end of the cylindrical housing 23, and one end of the second support tube 24 also supports the end of the reverse osmosis membrane 31, the annular chamber in the second housing 23, 24 is formed between the inner wall of the cylindrical housing 23 and the outer wall of the second support tube 24, the hollow chamber in the second housing 23, 24 is the chamber of the second support tube 24, and 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. Among them, the pre-filter assembly also includes a first annular end cap 25 and a second annular end cap 26 located in the annular chamber of the second housing 23, 24, and the first annular end cap 25 and the second annular end cap 26 clamp and fix the first core materials 21, 22.

[0044] For example, Figure 1 As shown, the upper end of the second support tube 24 is formed with an annular edge extending in the radial direction. The lower side of the annular edge of the second support tube 24 will cover the opening of the upper end of the cylindrical shell 23 and be connected and 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, Figure 1 As shown, during the assembly process of the composite filter element, the cylindrical shell 23 in the pre-filter assembly is fixed in the first shell 1, and then the second annular end cover 26, the first core materials 21, 22 and the first annular end cover 25 are placed in the cylindrical shell 23 in sequence, and the lower end of the second support tube 24 is continued to be fixed to the first shell 1 through the first annular end cover 25, the first core materials 21, 22 and the second annular end cover 26 in sequence, and the annular edge of the upper end of the second support tube 24 is sealed to the edge of the opening at the upper end of the cylindrical shell 23, and then the first annular end cover 25, the first core materials 21, 22 and the second annular end cover 26 are all fixed in the annular chamber in the second shells 23, 24, completing the installation of the pre-filter assembly in the first shell 1.

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

[0047] It can be understood that, in the installed state, the reverse osmosis membrane 31 is clamped and fixed between the second support tube 24 and the handle cover 16 .

[0048] This arrangement improves the convenience of installation and removal of the pre-filter assembly in the first housing 1. In addition, the reverse osmosis membrane 31 is supported and fixed in the first housing 1 by means of the second support tube 24 in the second housing 23, 24, avoiding the introduction of too many support fasteners and reducing the number of components in the composite filter element.

[0049] It should be noted that, according to actual applications, technicians in this field can construct the second shells 23 and 24 as a double-layer sleeve-type integrated structure to form an annular chamber and a hollow chamber, or, the second shells 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 adjustment and change of the specific structural settings of the second shells 23 and 24 do not deviate from the basic principles and scope of the utility model, and should be limited within the protection scope of the utility model.

[0050] Preferably, if Figure 1 As shown, an upward annular flange is formed at the upper end of the first support tube 5 , and the annular flange radially fixes the bottom of the second core material 4 .

[0051] When the second core material 4 is clamped and fixed in the water-permeable pipe 32, the annular flange cover of the first support pipe 5 is buckled on the bottom of the second core material 4 to ensure the stability of the second core material 4 in the water-permeable pipe 32. A fifth gap flow channel 65 is formed between the outer wall of the second core material 4 and the inner wall of the water-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 water-permeable tube 32, thereby preventing the concentrated water filtered by the reverse osmosis membrane 31 from entering the fifth gap flow channel 65 through the gap between the annular flange of the first support tube 5 and the inner wall of the water-permeable tube 32, thereby reducing the water quality of the water filtered by the composite filter element.

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

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

[0055] Specifically, Figure 2As shown, the tap water in the water system passes through the first water inlet 11 on the first shell 1 and enters the third gap flow channel 61 and then 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 the radial direction of the first core material 21 and 22 in turn to obtain primary filtered water. The primary filtered water is collected and flows to the second water inlet 12 with the help of the fourth gap flow channel 62, and enters the water system.

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

[0057] Specifically, Figure 3 As shown, when the primary filtered water enters the first gap flow channel 63 through the third water inlet 13 on the first shell 1, that is, the primary filtered water passes through the outer side of the cylindrical shell 23 of the second shell 23, 24 and is dispersed to the outer end of the reverse osmosis membrane 31. Under the action of water pressure, the primary filtered water penetrates along the radial direction of the reverse osmosis membrane 31 to form secondary filtered water. The secondary filtered water passes through the through hole 321 on the water-permeable pipe 32 and is collected in the fifth gap flow channel 65. The secondary filtered water surrounds the outer side of the second core material 4 and continues to penetrate and filter along the radial direction of the second core material 4 to obtain tertiary filtered water. The tertiary filtered water is collected in the chamber of the second core material 4. With the help of the first support tube 5, the tertiary filtered water flows to the fourth water inlet 14 on the first shell 1, that is, the composite filter element produces pure water. In addition, the water filtered by the reverse osmosis membrane 31 and not entering the fifth gap flow channel 65 forms concentrated water, which flows along the second gap flow channel 64 to the fifth water inlet 15 on the first shell 1 and discharges waste water outward.

[0058] Finally, the utility model also provides a water purifier, which includes the above-mentioned composite filter element.

[0059] So far, the technical solution of the utility model has been described in conjunction with the preferred embodiments shown in the accompanying drawings, but it is easy for those skilled in the art to understand that the protection scope of the utility model is obviously not limited to these specific embodiments. Without departing from the principle of the utility model, 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 fall within the protection scope of the utility model.

Claims

1. A composite filter element, characterized in that: It comprises a first housing (1) and a pre-filter component, a post-filter component and a reverse osmosis filter component located in the first housing (1). One end of the first shell (1) is provided with a first water receiving port (11), a second water receiving port (12), a third water receiving port (13), a fourth water receiving port (14) and a fifth water receiving port (15); The first water receiving port (11) and the second water receiving port (12) are respectively connected to the water inlet side and the water outlet side of the pre-filter assembly; A first gap flow channel (63) is formed between the pre-filter assembly and the inner wall of the first shell (1), and two ends of the first gap flow 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 shell (1) and are sleeved on the post-filter assembly. The water outlet side of the reverse osmosis filter assembly is connected to the water inlet side of the post-filter assembly. The water outlet side of the post-filter assembly is connected to the fourth water inlet (14). The concentrated water 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 comprises 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 is connected to the fourth water receiving port (14); the other end of the first support tube (5) is connected to the water outlet end of the second core material (4) and supports and fixes the second core material (4); a second gap flow 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 flow channel (64) are respectively connected to the concentrated water end of the reverse osmosis filter assembly and the fifth water receiving port (15).

3. The composite filter element according to claim 2, characterized in that: The pre-filter assembly comprises a first core material and a second shell, the second shell having an annular chamber and a hollow chamber isolated from each other, the first core material being located in the annular chamber; a third gap flow channel (61) communicating with the first water receiving port (11) 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 (62) communicating with the second water receiving port (12) 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 (63) is formed between the outer wall of the second shell and the inner wall of the first shell (1), the first support tube (5) is located in the hollow chamber, and the second gap flow 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 comprises a water permeable pipe (32) and a reverse osmosis membrane (31) wound on the water permeable pipe (32); the second core material (4) is arranged in the water permeable pipe (32); and a fifth gap flow channel (65) is formed between the water inlet side of the second core material (4) and the inner wall of the water permeable pipe (32).

4. The composite filter element according to claim 3, characterized in that: The second shell comprises a second support tube (24) and a cylindrical shell (23) sleeved on the outside of the second support tube (24); one end of the second support tube (24) is sealedly connected to one end of the cylindrical shell (23); one end of the second support tube (24) also supports and abuts against the end of the reverse osmosis membrane (31); the annular chamber is formed between the inner wall of the cylindrical shell (23) and the outer wall of the second support tube (24); the hollow chamber is the chamber of the second support tube (24); and 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 further comprises a first annular end cover (25) and a second annular end cover (26) located in the annular chamber, wherein the first annular end cover (25) and the second annular end cover (26) clamp and fix the first core material.

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

7. The composite filter element according to claim 2, characterized in that: An annular flange is formed at one end of the first support tube (5), and the annular flange 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 tube (5) is sealedly connected to one end of the water-permeable tube (32).

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

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

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