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. In order to solve the problem that a front filtering module and a rear filtering module of an existing composite filter element are inconvenient to disassemble, the composite filter element comprises the front filtering module and the rear filtering module, the front filtering module is provided with a first butt joint end, and the rear filtering module is provided with a second butt joint end. The first butt joint end and the second butt joint end are connected and detachably and fixedly connected. The first butt joint end and the second butt joint end are arranged on the front filtering module and the rear filtering module respectively, and the first butt joint end and the second butt joint end are detachably and fixedly connected, so that the front filtering module and the rear filtering module can be detached conveniently and can be replaced independently.

Description

Technical Field

[0001] The utility model relates to the technical field of drinking water devices, and particularly provides a composite filter element and a water purifier. Background Art

[0002] Existing water purifiers usually adopt two or three of a pre-filter element, a reverse osmosis filter element and a post-filter element to achieve the water purification function. Usually, the pre-filter element and the post-filter element are integrally arranged into a composite filter element to reduce the occupied volume of the filter element.

[0003] However, the service lives of the pre-filter material and the post-filter material in the composite filter element are different. When this composite filter element needs to be replaced, the composite filter element has a complex structure and is inconvenient to disassemble and replace. Usually, the whole composite filter element is replaced, which leads to the waste of resources because the service lives of some filter materials are not fully utilized, increases the use cost of users, and results in poor user experience.

[0004] Correspondingly, a new composite filter element is needed in this field to solve the above problems. Summary of the Utility Model

[0005] In order to solve the above problems in the prior art, that is, to solve the problem that it is inconvenient to disassemble the pre-filter module and the post-filter module of the existing composite filter element.

[0006] In a first aspect, the utility model provides a composite filter element, which includes a pre-filter module and a post-filter module. The pre-filter module has a first docking end, and the post-filter module has a second docking end. The first docking end is connected to the second docking end and is detachably and fixedly connected.

[0007] In the case of the preferred technical solution of the above composite filter element, the pre-filter module includes a first housing and a first filter assembly located in the first housing. The first docking end includes a first clamping structure and a first water passing port provided on the first housing.

[0008] The post-filter module includes a second housing, a third housing provided in the second housing, and a second filter assembly provided in the third housing. The second docking end includes a second water passing port and a second clamping structure provided on the second housing.

[0009] Wherein, the first clamping structure is detachably and fixedly connected to the second clamping structure, and the first water passing port is communicated with the second water passing port.

[0010] In the case of the preferred technical solution of the above composite filter element, the first filter assembly includes a water permeable pipe and a first filter core material. The first filter core material is sleeved outside the water permeable pipe. The first housing includes a cylindrical body and an end cap. The first end of the water permeable pipe passes through the end cap and inserts into the third housing. There is an annular gap between the inner wall of the cylindrical body and the edge of the end cap, and the annular gap forms the first water inlet. A second gap flow channel is formed between the first filter core material and the inner wall of the cylindrical body, and the second gap flow channel communicates with the first water inlet.

[0011] In the case of the preferred technical solution of the above composite filter element, a pre - inlet, a pre - outlet, a post - inlet, and a post - outlet are provided on the second housing.

[0012] There is a first gap flow channel between the outer wall of the third housing and the inner wall of the second housing. The two ends of the first gap flow channel communicate with the pre - inlet and the second water inlet respectively.

[0013] A partition structure is provided in the third housing. The partition structure divides the interior of the third housing into an independent annular chamber and a central chamber. The annular chamber surrounds the central chamber. The first end of the water permeable pipe inserts into the central chamber, and the central chamber communicates with the pre - outlet.

[0014] The second filter assembly is located in the annular chamber and surrounds the central chamber. There is a third gap flow channel between the second filter assembly and the inner wall of the third housing, and a fourth gap flow channel between the second filter assembly and the partition structure. The third gap flow channel and the fourth gap flow channel communicate with the post - inlet and the post - outlet respectively.

[0015] In the case of the preferred technical solution of the above composite filter element, the composite filter element further includes a first water lock valve, and the first water lock valve is located in the central chamber; and / or

[0016] The composite filter element further includes a second water lock valve, and the second water lock valve is arranged in the pre - outlet.

[0017] In the case of the preferred technical solution of the above composite filter element, the first clamping structure includes a plurality of protrusions arranged on the inner wall of the first housing. The plurality of protrusions are spaced apart along the circumferential direction of the first housing. The second clamping structure includes a plurality of clamping grooves arranged on the outer wall of the second housing. The plurality of clamping grooves are spaced apart along the circumferential direction of the second housing. The protrusions are in clamping fit with the clamping grooves.

[0018] In the case of the preferred technical solution of the above composite filter element, the card slot includes a communicating guiding portion and a clamping portion. The guiding portion extends along the axial direction of the second housing, and the clamping portion extends along the circumferential direction of the second housing. The protrusion can move along the length direction of the guiding portion and can be clamped and matched with the clamping portion.

[0019] In the case of the preferred technical solution of the above composite filter element, the first clamping structure further includes a plurality of clamping ribs provided on the first housing. The plurality of clamping ribs are spaced apart along the circumferential direction of the first housing. The clamping ribs extend radially into the first water inlet. The second clamping structure further includes a plurality of hooks provided on the second housing. The plurality of hooks are spaced apart along the circumferential direction of the second housing. The hooks extend axially into the first water inlet. The hooks can be clamped and matched with the clamping ribs as the first housing and the second housing rotate relative to each other.

[0020] In the case of the preferred technical solution of the above composite filter element, a plurality of supporting ribs are provided on the outer wall of the third housing. The plurality of supporting ribs are spaced apart along the circumferential direction of the third housing. The supporting ribs abut against the inner wall of the second housing; and / or

[0021] The composite filter element further includes a sealing ring, and the sealing ring is located between the first housing and the second housing.

[0022] In a second aspect, the present invention further provides a water purifier, and the water purifier includes the above composite filter element.

[0023] Those skilled in the art can understand that the composite filter element of the present invention includes a pre-filter module and a post-filter module that are detachably and fixedly connected through a first docking end and a second docking end. In this way, it is convenient to independently replace the pre-filter module and the post-filter module.

[0024] Further, the pre-filter module includes a first housing and a first filter assembly located within the first housing; the first docking end includes a first clamping structure and a first water passage; the post-filter module includes a second housing, a third housing, and a second filter assembly; the second housing is provided with a pre-inlet, a pre-outlet, a post-inlet, and a post-outlet, and the second docking end includes a second water passage and a second clamping structure; the third housing has an annular chamber and a central chamber isolated from each other, the second filter assembly is located within the annular chamber, the annular chamber is respectively communicated with the post-inlet and the post-outlet, a first gap flow channel is formed between the outer wall of the third housing and the inner wall of the second housing, the first gap flow channel is respectively communicated with the pre-inlet and the second water passage, and the central chamber is communicated with the pre-outlet; the first clamping structure of the first docking end is detachably connected to the second clamping structure of the second docking end, and the first water passage is communicated with the second water passage. With such an arrangement, by means of the detachable connection between the first clamping structure and the second clamping structure, the pre-filter module and the post-filter module can be detached and installed independently of each other, facilitating the replacement of the filter elements within the composite filter element and reducing the usage cost of the composite filter element.

[0025] Still further, the composite filter element further includes a first water lock valve located within the central chamber of the third housing. With such an arrangement, when the pre-filter module and the post-filter module are detached and separated from each other, the first water lock valve can block the water in the central chamber of the third housing, preventing a large amount of water from flowing out and causing the working environment to be humid.

[0026] Still further, a plurality of support ribs are provided on the outer wall of the third housing, the support ribs are evenly distributed along the circumferential direction of the third housing, and the support ribs abut against the inner wall of the second housing. With such an arrangement, the stability of the third housing within the second housing is enhanced, ensuring that the first gap flow channel is evenly distributed and unobstructed.

[0027] Still further, the first clamping structure further includes a clamping rib formed on the annular edge, and the second clamping structure further includes a hook formed on the second docking end, the hook extends into the first water passage, and the second housing is rotated to enable the hook to be engaged with the clamping rib. With such an arrangement, the connection stability between the second housing and the first housing is greatly enhanced.

[0028] Still further, the composite filter element further includes a second water lock valve disposed within the pre-outlet. When the composite filter element is detached as a whole, the second water lock valve can block the water in the central chamber of the third housing and the water in the water permeable pipe, preventing a large amount of water from flowing out of the pre-outlet and causing the working environment to be humid.

[0029] In addition, the water purifier further provided by the present utility model on the basis of the above technical solution, due to the adoption of the above composite filter element, has the technical effects possessed by the above composite filter element. Compared with the existing water purifiers, the composite filter element of the water purifier of the present utility model is more convenient to replace the core material, has a low cost, and improves the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The preferred embodiments of the present utility model will be described below with reference to the accompanying drawings. In the drawings:

[0031] Figure 1 is the overall structural schematic diagram of the composite filter element of the present utility model;

[0032] Figure 2 is the structural schematic diagram of the post - filtration module in the composite filter element of the present utility model;

[0033] Figure 3 is the structural schematic diagram of the pre - filtration module in the composite filter element of the present utility model;

[0034] Figure 4 is the axial sectional structural schematic diagram of the composite filter element of the present utility model.

[0035] LIST OF REFERENCE NUMERALS:

[0036] 1. Post - filtration module; 11. Second housing; 111. Card slot; 12. Hook; 13. First gap flow channel; 131. Second water passing port; 14. Bottom plate; 15. Insertion port; 161. Front outlet; 162. Front inlet; 163. Rear inlet; 164. Rear outlet; 2. Pre - filtration module; 21. Cylindrical body; 211. Protrusion; 212. Annular edge; 22. End cap; 221. Rib; 23. Permeable pipe; 231. Through hole; 24. Second gap flow channel; 241. First water passing port; 3. Second filter core material; 4. First filter core material; 41. PP cotton core layer; 42. First cylindrical carbon core; 5. Third housing; 51. Support rib; 52. First water lock valve; 6. Sealing ring; 7. Second water lock valve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0037] The preferred embodiments of the present utility model will be described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principle of the present utility model and are not intended to limit the protection scope of the present utility model.

[0038] It should be noted that in the description of the present utility model, the terms "upper", "lower", "top", "bottom" and other terms indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is only for convenience of description, rather than indicating or implying that the device or component must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation to the present utility model.

[0039] In addition, it should be noted that in the description of the present utility model, unless otherwise clearly specified and defined, the terms "installed", "connected", "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, and it can be the communication inside two components. For those skilled in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. In addition, the terms "first", "second", "third", "fourth" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0040] As Figures 1 to 4 shown, the composite filter element of the present utility model includes a pre-filtering module 2 and a post-filtering module 1. Among them, the pre-filtering module 2 has a first docking end, and the post-filtering module 1 has a second docking end. The first docking end is connected to the second docking end and is detachably and fixedly connected.

[0041] Specifically, as Figure 3 and Figure 4 shown, the pre-filtering module 2 includes a first housing and a first filtering component located inside the first housing. The first docking end is arranged on the first housing and is located at the top of the first housing when viewed from Figure 4 above; among them, the first docking end includes a first clamping structure and a first water passing port 241.

[0042] More specifically, as Figure 3 and Figure 4 shown, the first housing includes a cylindrical body 21 and an end cover 22. Among them, there is an annular gap between the inner wall of the cylindrical body 21 and the edge of the end cover 22, and the annular gap forms the first water passing port 241. A second gap flow channel 24 is formed between the first filtering component and the inner wall of the cylindrical body 21, and the second gap flow channel 24 is communicated with the first water passing port 241.

[0043] Exemplarily, the bottom of the cylindrical body 21 is closed, the end cover 22 is located at the top of the cylindrical body 21, a radially extending annular edge 212 is formed on the inner wall of the cylindrical body 21, and the first water passing port 241 is formed between the annular edge 212 and the edge of the end cover 22, that is, the first water passing port 241 is annularly surrounded around the end cover 22.

[0044] Preferably, asFigure 3 and Figure 4 As shown in and

[0045] , the first filtration component includes a permeable pipe 23 and a first filter core 4, and the first filter core 4 is sleeved outside the permeable pipe 23.

[0045] Among them, a plurality of through holes 231 are provided on the circumferential tube wall of the permeable pipe 23. The first end of the permeable pipe 23 (viewed as the top end from Figure 4 above) passes through the end cap 22 and is inserted into the post-filtration module 1. The end cap 22 covers the top end of the first filter core 4 to prevent water from seeping out from the top end face of the first filter core 4.

[0046] Preferably, as shown in Figure 1 , Figure 2 and Figure 4 shown, the post-filtration module 1 includes a second housing 11, a third housing 5 disposed in the second housing 11, and a second filtration component disposed in the third housing 5. The second docking end is disposed on the second housing 11 and is viewed as being disposed at the bottom end of the second housing 11 from Figure 4 above. The second docking end includes a second water inlet 131 and a second clamping structure.

[0047] Among them, an annular gap is formed on the bottom plate 14 of the second housing 11 at the edge, and the annular gap forms the second water inlet 131. The first end of the permeable pipe 23 of the pre-filtration module 2 passes through the end cap 22 and the bottom plate 14 in sequence and is inserted into the third housing 5.

[0048] Exemplarily, the bottom plate 14 of the second housing 11 is provided with an insertion port 15. The insertion port 15 is preferably located at the center position of the bottom plate 14. The third housing 5 is also provided with an insertion port at the corresponding position of the insertion port 15. The first end of the permeable pipe 23 passes through the two insertion ports and extends into the third housing 5. The insertion port 15 is preferably a circular hole, and the permeable pipe 23 is also a circular pipe. The outer diameter of the permeable pipe 23 matches the inner diameter of the insertion port 15, and the two are sealed and connected to prevent water seepage.

[0049] Preferably, as shown in Figure 1 , Figure 2 and Figure 4 shown, the second housing 11 is provided with a pre-inlet 162, a pre-outlet 161, a post-inlet 163, and a post-outlet 164. A first gap flow channel 13 is provided between the outer wall of the third housing 5 and the inner wall of the second housing 11. The two ends of the first gap flow channel 13 are respectively communicated with the pre-inlet 162 and the second water inlet 131.

[0050] Preferably, as shown in Figure 1 , Figure 2 and Figure 4As shown, a partition structure is provided inside the third housing 5. The partition structure divides the interior of the third housing 5 into an independent annular chamber and a central chamber. The annular chamber is arranged around the central chamber. The first end of the water permeable pipe 23 is inserted into the central chamber, and the central chamber is communicated with the front outlet 161.

[0051] Among them, the second filtering component is located in the annular chamber and arranged around the central chamber. There is a third gap flow channel (not shown in the figure) between the second filtering component and the inner wall of the third housing 5, and a fourth gap flow channel (not shown in the figure) between the second filtering component and the partition structure. The third gap flow channel and the fourth gap flow channel are respectively communicated with the rear inlet 163 and the rear outlet 164.

[0052] Exemplarily, the partition structure is arranged in a cylindrical shape. The top and bottom of the cylindrical shape are respectively in sealing contact with the inner top wall and the inner bottom wall of the third housing 5. The interior of the partition structure forms a central chamber, and an annular chamber is formed between the partition structure and the inner side wall of the third housing 5.

[0053] Preferably, as Figure 4 shown, the first filter core 4 includes an outer PP cotton core layer 41 and an inner first cylindrical carbon core 42. Among them, the second gap flow channel 24 is formed between the PP cotton core layer 41 and the inner wall of the cylindrical body 21 of the first housing.

[0054] Preferably, as Figure 4 shown, the second filtering component includes a second filter core 3. The second filter core 3 is a second cylindrical carbon core. The third gap flow channel is formed between the outer wall of the second cylindrical carbon core and the inner wall of the third housing 5, and the fourth gap flow channel is formed between the inner wall of the second cylindrical carbon core and the partition structure.

[0055] Raw water enters from the front inlet 162, sequentially passes through the first gap flow channel 13, the second water passing port 131 and the first water passing port 241 and enters the second gap flow channel 24. Under the action of water pressure, the water flow sequentially passes through the PP cotton core layer 41, the first cylindrical carbon core 42, and the through holes 231 on the water permeable pipe 23 in the radial direction, and finally converges in the water permeable pipe 23 to form primary filtered water. The primary filtered water enters the central chamber of the third housing 5 through the top end of the water permeable pipe 23, and then flows out from the front outlet 161.

[0056] When the purified water enters the third gap flow channel from the rear inlet 163, under the action of water pressure, the purified water flow passes through the second cylindrical carbon core for filtration to form high-grade filtered water and converges in the fourth gap flow channel. The high-grade filtered water finally flows out through the rear outlet 164.

[0057] Preferably, as Figures 2 to 4As shown, the first clamping structure includes a plurality of protrusions 211 formed on the inner wall of the cylindrical body 21 of the first housing. The plurality of protrusions 211 are circumferentially spaced apart along the cylindrical body 21. The second clamping structure includes a plurality of clamping grooves 111 formed on the outer wall of the second housing 11. The plurality of clamping grooves 111 are circumferentially spaced apart along the second housing 11. The plurality of protrusions 211 correspond to the plurality of clamping grooves 111 one by one and are in clamping cooperation.

[0058] Preferably, as Figure 2 shown, the clamping groove 111 includes a communicating guiding portion and a clamping portion. The guiding portion extends along the axial direction of the second housing 11, and the clamping portion extends along the circumferential direction of the second housing 11. The protrusion 211 can move along the length direction of the guiding portion and can be in clamping cooperation with the clamping portion.

[0059] Exemplarily, the clamping groove 111 is arranged in an L-shaped structure. The long side of the L-shaped structure is the guiding portion, which is arranged along the axial direction of the second housing 11. The short side of the L-shaped structure is the clamping portion, which is arranged along the circumferential direction of the second housing 11. During assembly, first insert the protrusion 211 of the cylindrical body 21 into the guiding portion of the clamping groove 111, and then move the protrusion 211 along the guiding portion to axially compress the post-filter module 1 and the pre-filter module 2. The protrusion 211 also just moves to the position where the guiding portion and the clamping portion of the clamping groove 111 communicate. Then rotate the first housing or the second housing 11 to guide the protrusion 211 into the clamping portion of the clamping groove 111, thereby axially clamping and fixing the second housing 11 and the cylindrical body 21.

[0060] Preferably, as Figures 2 to 4 shown, the first clamping structure further includes a plurality of ribs 221 arranged on the first housing. The plurality of ribs 221 are circumferentially spaced apart along the first housing. The ribs 221 extend radially into the first water inlet 241. The second clamping structure further includes a plurality of hooks 12 arranged on the second housing 11. The plurality of hooks 12 are circumferentially spaced apart along the second housing 11. The hooks 12 extend axially into the first water inlet 241. The hooks 12 can be in clamping cooperation with the ribs 221 as the first housing and the second housing 11 rotate relative to each other.

[0061] Exemplarily, during assembly, first place the protrusion 211 on the first housing in the guiding portion of the clamping groove 111. At this time, the hook 12 on the second housing 11 just aligns with the first water inlet 241 on the first housing. Press down the second housing 11. The protrusion 211 moves to the top of the guiding portion, and the bottom end of the hook 12 is inserted into the first water inlet 241. Rotate the second housing 11. The protrusion 211 enters the clamping portion of the clamping groove 111 and is in clamping cooperation therewith. The hook 12 is screwed into the bottom of the rib 221 and is in clamping cooperation therewith.

[0062] That is to say, the snap-fit between the hook 12 and the rib 221 and the snap-fit between the protrusion 211 and the slot 111 are completed synchronously. The snap-fit between the hook 12 and the rib 221 greatly enhances the connection strength of the docking end between the cylindrical body 21 and the second housing 11, preventing the front filter module 2 from becoming loose from the rear filter module 1.

[0063] It should be noted that in practical applications, those skilled in the art can set the rib 221 at the edge of the annular edge 212, or can also set the rib 221 at the edge of the end cap 22. When assembling the front filter module 2 and the rear filter module 1, by means of the snap-fit between the rib 221 and the hook 12, the end cap 22 is pre-hung on the bottom plate 14 of the second housing 11, and then the water permeable pipe 23 and the first filter element 4 are fixed in advance. Finally, the cylindrical body 21 and the second housing 11 are snap-fixed, thereby improving the flexibility and convenience of the composite assembly disassembly.

[0064] Preferably, as Figure 4 shown, the composite filter element of the present invention further includes a first water lock valve 52, and the first water lock valve 52 is located in the central chamber of the third housing 5.

[0065] When the front filter module 2 is disassembled and separated from the rear filter module 1, it prevents the accumulated water in the central chamber of the third housing 5 from flowing out in large amounts from the insertion port 15, resulting in a humid working environment.

[0066] Preferably, as Figure 4 shown, a plurality of radially arranged support ribs 51 are provided on the outer wall of the third housing 5, and the plurality of support ribs 51 are circumferentially spaced apart along the third housing 5, and the support ribs 51 abut against the inner wall of the second housing 11.

[0067] With the help of the support ribs 51, the installation stability of the third housing 5 in the second housing 11 can be enhanced, preventing the third housing 5 from generating radial displacement in the second housing 11 after the composite filter element is subjected to an external force.

[0068] Preferably, as Figure 4 shown, the composite filter element of the present invention further includes a second water lock valve 7, and the second water lock valve 7 is arranged in the front water outlet 161.

[0069] When the composite filter element is disassembled from the water circuit system as a whole, it prevents the accumulated water in the central chamber of the third housing 5 and the water permeable pipe 23 from flowing out in large amounts from the front water outlet 161, resulting in a humid working environment.

[0070] Preferably, as Figure 4 shown, the composite filter element of the present invention further includes a sealing ring 6, and the sealing ring 6 is located between the first housing and the second housing 11.

[0071] Exemplarily, the sealing ring 6 is located between the annular edge 212 of the first housing and the edge of the bottom plate 14 on the second housing 11. After the second housing 11 is snap-fitted and fixed to the cylindrical body 21, the sealing ring 6 seals the annular edge 212 of the cylindrical body 21 and the edge of the bottom plate 14 of the second housing 11, preventing water leakage at the docking end of the composite filter element and enhancing the sealing performance of the composite filter element.

[0072] It should be noted that the above-mentioned first water locking valve 52 and second water locking valve 7 can be selected as one-way check valves that conduct water pressure and water flow and do not conduct without water pressure.

[0073] Finally, the present utility model also provides a water purifier, which includes the above-mentioned composite filter element.

[0074] So far, the technical solution of the present utility model has been described in conjunction with the preferred embodiments shown in the drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present utility model is obviously not limited to these specific embodiments. Without departing from the principle of the present 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 all fall within the protection scope of the present utility model.

Claims

1. A composite filter element, characterized in that: It comprises a pre-filter module (2) and a post-filter module (1), the pre-filter module (2) having a first docking end, the post-filter module (1) having a second docking end, the first docking end being connected to the second docking end and being detachably fixedly connected; The pre-filter module (2) comprises a first shell and a first filter assembly located in the first shell, and the first docking end comprises a first clamping structure and a first water outlet (241) arranged on the first shell; The post-filter module (1) comprises a second shell (11), a third shell (5) arranged in the second shell (11), and a second filter assembly arranged in the third shell (5); the second docking end comprises a second water outlet (131) and a second clamping structure arranged on the second shell (11); The first clamping structure and the second clamping structure are detachably fixedly connected, and the first water outlet (241) is in communication with the second water outlet (131).

2. The composite filter element according to claim 1, characterized in that: The first filter assembly comprises a water permeable pipe (23) and a first filter core material (4), wherein the first filter core material (4) is sleeved on the outer side of the water permeable pipe (23), and the first shell comprises a cylindrical body (21) and an end cover (22). The first end of the water permeable pipe (23) passes through the end cover (22) and is inserted into the third shell (5). An annular gap is provided between the inner wall of the cylindrical body (21) and the edge of the end cover (22), and the annular gap forms the first water outlet (241). A second gap flow channel (24) is formed between the first filter core material (4) and the inner wall of the cylindrical body (21), and the second gap flow channel (24) is connected to the first water outlet (241).

3. The composite filter element according to claim 2, characterized in that: The second shell (11) is provided with a front water inlet (162), a front water outlet (161), a rear water inlet (163) and a rear water outlet (164). A first gap flow channel (13) is provided between the outer wall of the third shell (5) and the inner wall of the second shell (11), and two ends of the first gap flow channel (13) are respectively connected to the front water inlet (162) and the second water outlet (131). The third shell (5) is provided with a partition structure, the partition structure partitions the interior of the third shell (5) into an independent annular chamber and a central chamber, the annular chamber is arranged around the central chamber, the first end of the water permeable pipe (23) is inserted into the central chamber, and the central chamber is communicated with the front water outlet (161). The second filter assembly is located in the annular chamber and is arranged around the central chamber. A third gap flow channel is provided between the second filter assembly and the inner wall of the third shell (5). A fourth gap flow channel is provided between the second filter assembly and the partition structure. The third gap flow channel and the fourth gap flow channel are respectively connected to the rear water inlet (163) and the rear water outlet (164).

4. The composite filter element according to claim 3, characterized in that: The composite filter element further comprises a first water lock valve (52), wherein the first water lock valve (52) is located in the central chamber; and / or The composite filter element further comprises a second water lock valve (7), wherein the second water lock valve (7) is arranged in the front water outlet (161).

5. The composite filter element according to claim 1, characterized in that: The first snap-fitting structure comprises a plurality of protrusions (211) arranged on the inner wall of the first shell, and the plurality of protrusions (211) are distributed at intervals along the circumference of the first shell; the second snap-fitting structure comprises a plurality of slots (111) arranged on the outer wall of the second shell (11), and the plurality of slots (111) are distributed at intervals along the circumference of the second shell (11); the protrusions (211) are snap-fitted with the slots (111).

6. The composite filter element according to claim 5, characterized in that: The clamping groove (111) comprises a communicating guide portion and a clamping portion, wherein the guide portion extends along the axial direction of the second shell (11), and the clamping portion extends along the circumferential direction of the second shell (11), and the protrusion (211) can move along the length direction of the guide portion and can be clamped and matched with the clamping portion.

7. The composite filter element according to claim 6, characterized in that: The first clamping structure further comprises a plurality of clamping ribs (221) arranged on the first shell, the plurality of clamping ribs (221) are spaced apart along the circumference of the first shell, and the clamping ribs (221) extend radially into the first water outlet (241); the second clamping structure further comprises a plurality of clamping hooks (12) arranged on the second shell (11), the plurality of clamping hooks (12) are spaced apart along the circumference of the second shell (11), and the clamping hooks (12) extend axially into the first water outlet (241); the clamping hooks (12) can be clamped and matched with the clamping ribs (221) as the first shell and the second shell (11) rotate relative to each other.

8. The composite filter element according to any one of claims 1 to 7, characterized in that: A plurality of supporting convex ribs (51) are provided on the outer wall of the third shell (5), the plurality of supporting convex ribs (51) are distributed at intervals along the circumference of the third shell (5), and the supporting convex ribs (51) abut against the inner wall of the second shell (11); and / or The composite filter element further comprises a sealing ring (6), wherein the sealing ring (6) is located between the first shell and the second shell (11).

9. A water purifier, characterized in that: A composite filter element comprising any one of claims 1 to 8.

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