Filter element structure and water purification equipment

Abstract

The utility model discloses a filter element structure and water purification equipment, and relates to the technical field of water purification, the filter element structure comprises a filter bottle, an end cover and a filter assembly, the filter bottle is internally provided with a cavity, and the cavity is provided with an opening; a first water passing end is arranged at one end, far away from the opening, of the filter bottle and is communicated with the cavity; the end cover is detachably connected with the end, provided with the opening, of the filter bottle, a second water passing end is arranged on the end cover, and the second water passing end is communicated with the cavity; the filtering assembly is arranged in the cavity; the filter assembly comprises two or more than two filter element modules, and the two or more than two filter element modules are stacked in the length direction of the cavity; the internal water channels of the two or more filter element modules form a series-connected water channel structure, and the two ends of the water channel structure are communicated with the first water passing end and the second water passing end respectively. According to the technical scheme provided by the invention, a user only needs to replace the damaged or invalid filter element module according to actual needs, so that the replacement cost is greatly reduced, and the burden of a waste filter element on the environment is also reduced.

Description

Technical Field

[0001] This application relates to the field of water purification technology, and in particular to a filter element structure and water purification equipment. Background Technology

[0002] As living standards improve, people have increasingly higher requirements for drinking water hygiene. Household water purifiers play a vital role in purifying water quality, but replacing their filter cartridges is inconvenient. Filter cartridges used for extended periods not only lose their purification effect significantly but may also become new sources of pollution, further impacting water quality. To ensure the filtration effect of water purifiers, it is usually necessary to replace the entire filter cartridge periodically. However, this replacement method not only increases the cost of filter cartridge replacement but also adds to the environmental burden caused by discarded filter cartridges. Utility Model Content

[0003] The main purpose of this application is to propose a filter element structure and water purification equipment, which aims to solve the problems of high replacement costs of existing filter elements and the fact that waste filter elements also increase the pressure on environmental protection.

[0004] To achieve the above objectives, the filter element structure proposed in this application includes:

[0005] A filter bottle, wherein the filter bottle has an internal cavity with an opening; and a first water inlet is provided at the end of the filter bottle away from the opening, the first water inlet communicating with the cavity.

[0006] An end cap is provided, which is detachably connected to one end of the filter bottle that has an opening. The end cap is provided with a second water inlet, which communicates with the cavity.

[0007] A filter assembly is disposed within the cavity; the filter assembly includes two or more filter cartridge modules, which are stacked along the length of the cavity; the internal water channels of the two or more filter cartridge modules form a series water channel structure, and the two ends of the water channel structure are respectively connected to the first water inlet and the second water inlet.

[0008] In one embodiment, the inner side of the end cap is provided with a first limiting groove; the filter element module that abuts against the end cap in the filter assembly is configured as the tail end filter element module, the tail end filter element module is provided with a first connecting part, the first connecting part is engaged with the first limiting groove; the first limiting groove is connected to the second water inlet, the first connecting part is provided with a first fluid flow channel inside, and the first fluid flow channel is connected to the internal water channel of the tail end filter element module.

[0009] In one embodiment, the inner wall of the filter bottle on the side away from the end cap is provided with a second limiting groove; the filter module farthest from the tail end in the filter assembly is set as the filter module at the head end; the filter module at the head end is at least partially engaged with the second limiting groove, and the internal water passage of the filter module at the head end is connected to the first water inlet end.

[0010] In one embodiment, the first connecting portion is sealed to the first limiting groove; and / or,

[0011] The filter module at the first end is at least partially sealed to the second limiting groove.

[0012] In one embodiment, the second limiting groove has an extension section inside, and the filter module at the first end has a third limiting groove, with the extension section engaging with the third limiting groove.

[0013] In one embodiment, the extension section has a second fluid channel inside, which is connected to the first water inlet.

[0014] In one embodiment, between two adjacent filter modules, one filter module is provided with a fourth limiting groove, and the other filter module is provided with a second connecting part. The second connecting part is engaged with the fourth limiting groove, and the second connecting part is provided with a second fluid channel, which is connected to the adjacent filter modules respectively.

[0015] In one embodiment, the filtration assembly includes two filter modules, which are respectively configured as a primary filter module and a secondary filter module. The internal water channels of the primary and secondary filter modules form the water channel structure. The end of the primary filter module away from the secondary filter module is connected to the end cap, and the internal water channel of the primary filter module is connected to the first water inlet. The end of the secondary filter module away from the primary filter module is connected to the inner wall of the cavity, and the internal water channel of the secondary filter module is connected to the second water inlet. Alternatively,

[0016] The filtration assembly includes three filter modules, which are respectively configured as a primary filter module, a secondary filter module, and a tertiary filter module. The primary, secondary, and tertiary filter modules are stacked along the length of the cavity, and their internal water channels form the water channel structure. The end of the primary filter module furthest from the secondary filter module is connected to the end cap, and its internal water channel is connected to the first water inlet. The end of the tertiary filter module furthest from the secondary filter module is connected to the inner wall of the cavity, and its internal water channel is connected to the second water inlet.

[0017] The filtration assembly includes four filter modules, which are respectively configured as a primary filter module, a secondary filter module, a tertiary filter module, and a quaternary filter module. The primary, secondary, tertiary, and quaternary filter modules are stacked along the length of the cavity, and their internal water channels form the water channel structure. The end of the primary filter module away from the secondary filter module is connected to the end cap, and its internal water channel is connected to the first water inlet. The end of the quaternary filter module away from the tertiary filter module is connected to the inner wall of the cavity, and its internal water channel is connected to the second water inlet.

[0018] In one embodiment, the end cap is threaded to the end of the filter bottle that has an opening.

[0019] This application also proposes a water purification device, including the filter element structure as described above.

[0020] The technical solution of this application employs two or more filter cartridge modules to form a filter assembly. All filter cartridge modules are stacked along the length of the filter bottle cavity, forming a series water channel structure. The fluid to be filtered enters the cavity from either the first or second water inlet, flows through the water channel structure of the filter assembly, achieves filtration, and forms filtered fluid. The filtered fluid is finally output from the other of the first or second water inlet to the outside of the filter cartridge structure. When a filter cartridge module fails, only that module needs to be replaced, without replacing the entire filter cartridge assembly. Because the filter cartridge modules can be replaced individually, the user only needs to replace the damaged or faulty modules as required. Using degraded filter modules not only significantly reduces replacement costs but also decreases the number of waste filter modules generated from replacing entire filter cartridges, thus reducing the environmental burden. The modular design makes it easier to disassemble and classify used filter modules, facilitating recycling. Users can sort the replaced filter modules according to their material and hand them over to specialized recycling organizations, improving the recycling rate of the filter structure. Furthermore, the detachable connection between the end cap and the filter bottle with an opening allows users to easily open the end cap for convenient replacement of the filter module, reducing the complexity and tools required during the replacement process and further lowering replacement costs. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of an embodiment of the filter element structure provided in this application.

[0023] Explanation of icon numbers:

[0024] 1. Filter bottle; 11. Cavity; 12. First water inlet end; 13. Second limiting groove; 14. Extension section; 141. Second fluid channel; 2. End cap; 21. Second water inlet end; 22. First limiting groove; 3. Filter assembly; 31. Filter element module; 311. Filter element module at the tail end; 3111. First connecting part; 31111. First fluid flow channel; 312. Filter element module at the head end; 313. Fourth limiting groove; 314. Second connecting part; 3141. Second fluid channel; 315. First-stage filter element module; 316. Second-stage filter element module; 317. Third-stage filter element module; 318. Fourth-stage filter element module.

[0025] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0026] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0027] It should be noted that if the embodiments of this application involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0028] Furthermore, if the embodiments of this application involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0029] As living standards improve, people have increasingly higher requirements for drinking water hygiene. Household water purifiers play a vital role in purifying water quality, but replacing their filter cartridges is inconvenient. Filter cartridges used for extended periods not only lose their purification effect significantly but may also become new sources of pollution, further impacting water quality. To ensure the filtration effect of water purifiers, it is usually necessary to replace the entire filter cartridge periodically. However, this replacement method not only increases the cost of filter cartridge replacement but also adds to the environmental burden caused by discarded filter cartridges.

[0030] To address the aforementioned issues, this application proposes a filter element structure.

[0031] Please see Figure 1 In one embodiment of this application, the filter element structure includes a filter bottle 1, an end cap 2, and a filter assembly 3. The filter bottle 1 has a cavity 11 inside, and the cavity 11 has an opening. The end of the filter bottle 1 away from the opening has a first water inlet 12, which communicates with the cavity 11. The end cap 2 is detachably connected to the end of the filter bottle 1 with the opening, and the end cap 2 has a second water inlet 21, which communicates with the cavity 11. The filter assembly 3 is disposed inside the cavity 11. The filter assembly 3 includes two or more filter element modules 31, which are stacked along the length of the cavity 11. The internal water channels of the two or more filter element modules 31 form a series water channel structure, and the two ends of the water channel structure are respectively connected to the first water inlet 12 and the second water inlet 21.

[0032] In the above structure, the filter assembly 3 is composed of two or more filter cartridge modules 31. All filter cartridge modules 31 are stacked along the length of the filter bottle 1 cavity 11 to form a series water channel structure. The fluid to be filtered enters the cavity 11 from one of the first water inlet 12 or the second water inlet 21, flows through the water channel structure of the filter assembly 3, achieves filtration, and forms filtered fluid. The filtered fluid is finally output from the other of the first water inlet 12 or the second water inlet 21 to the outside of the filter cartridge structure. When one of the filter cartridge modules 31 fails, only that module needs to be replaced, without replacing the entire filter cartridge assembly. Since the filter cartridge module 31 can be replaced individually, the user only needs to replace it according to actual needs. Replacing damaged or malfunctioning filter module 31 not only significantly reduces replacement costs but also decreases the number of waste filter modules generated from replacing the entire filter, thus reducing the environmental burden. The modular design of the filter module 31 makes it easier to disassemble and classify waste filter modules, facilitating recycling. Users can sort the replaced filter modules 31 according to their material and hand them over to specialized recycling organizations, improving the recycling rate of the filter structure. Furthermore, the detachable connection between the end cap 2 and the end of the filter bottle 1 with an opening allows users to easily open the end cap 2 for convenient replacement of the filter module 31, reducing the complexity of the replacement process and the required tools, further lowering replacement costs.

[0033] In one embodiment, the inner side of the end cap 2 is provided with a first limiting groove 22; the filter element module 31 in the filter assembly 3 that abuts against the end cap 2 is set as the tail end filter element module 311, the tail end filter element module 311 is provided with a first connecting part 3111, the first connecting part 3111 is engaged with the first limiting groove 22; the first limiting groove 22 is connected to the second water inlet 21, the first connecting part 3111 is provided with a first fluid flow channel 31111 inside, the first fluid flow channel 31111 is connected to the internal water passage of the tail end filter element module 311.

[0034] In the above structure, the first connecting part 3111 of the filter module 311 at the tail end engages with the first limiting groove 22 of the end cover 2, enabling the filter module 31 to be precisely positioned during installation and ensuring the stability of its connection with the end cover 2. When replacing the filter module 31, the user only needs to align the first connecting part 3111 of the new filter module 311 at the tail end with the limiting groove and snap it in. The operation is simple and quick, reducing errors and difficulties in the installation process. In addition, the first limiting groove 22 is connected to the second water inlet 21. The first connecting part 3111 of the filter module 311 at the tail end is provided with a first fluid flow channel 31111, and the first fluid flow channel 31111 is connected to the internal water passage of the filter module 311 at the tail end. This ensures that the water can be smoothly output from the first fluid flow channel 31111 to the second water inlet 21 and continue to pass through other filter modules 31 to complete filtration, ensuring smooth water flow in the filter assembly 3.

[0035] In one embodiment, a second limiting groove 13 is provided on the inner wall of the filter bottle 1 on the side away from the end cap 2; the filter element module 31 farthest from the tail end of the filter assembly 3 is set as the first end filter element module 312; the first end filter element module 312 is at least partially engaged with the second limiting groove 13, and the internal water passage of the first end filter element module 312 is connected to the first water inlet 12.

[0036] In the above structure, the engagement of the first filter element module 312 with the second limiting groove 13 enables the first filter element module 312 to be precisely positioned during installation, ensuring a tight fit between it and the inner wall of the filter bottle 1, thereby improving the stability of the installation of the first filter element module 312.

[0037] In one embodiment, the first connecting portion 3111 is sealed to the first limiting groove 22; the filter module 312 at the head end is at least partially sealed to the second limiting groove 13.

[0038] In the above structure, the first connecting part 3111 is sealed to the first limiting groove 22, and the filter element module 312 at the first end is sealed to the second limiting groove 13, ensuring that no leakage occurs during the water flow into and out of the filter assembly 3, thereby guaranteeing the safety and purity of the filtered water. It should be noted that the above sealing connection can be achieved using a sealing ring or sealant.

[0039] In one embodiment, the second limiting groove 13 has an extension section 14 inside, and the filter module 312 at the first end has a third limiting groove, with the extension section 14 engaging with the third limiting groove.

[0040] In the above structure, the engagement of the extension section 14 with the third limiting groove provides an additional positioning point for the filter module 312 at the first end; the second limiting groove 13 and the extension section 14 achieve dual positioning, making the filter module 312 at the first end more stable during installation.

[0041] In one embodiment, the extension section 14 is provided with a second fluid channel 141, which is connected to the first water inlet 12.

[0042] In the above structure, the second fluid channel 141 can guide the direction of water flow, so that when the water flows into the filter module 312 at the first end, it can enter the first water inlet 12 more smoothly, avoiding the generation of eddies or backflow at the connection point and reducing energy loss during the filtration process.

[0043] In one embodiment, between two adjacent filter modules 31, one filter module 31 is provided with a fourth limiting groove 313, and the other filter module 31 is provided with a second connecting part 314. The second connecting part 314 is engaged with the fourth limiting groove 313. The second connecting part 314 is provided with a second fluid channel 141, which is connected to the adjacent filter module 31.

[0044] In the above structure, the snap-fit ​​structure between the fourth limiting groove 313 and the second connecting part 314 provides a firm connection for adjacent filter cartridge modules 31, allowing them to fit tightly together and preventing relative movement or misalignment, thus ensuring the overall stability of the filter assembly 3. Even under water flow impact or water purification equipment vibration, the filter cartridge modules 31 can maintain a stable working state, avoiding a decrease in filtration effect or equipment failure due to displacement of the filter cartridge modules 31. The second fluid channel 141 is connected to the adjacent filter cartridge modules 31 respectively, so that the internal water channels of multiple filter cartridge modules 31 form a series water channel structure.

[0045] Furthermore, the second connecting part 314 and the fourth limiting groove 313 are sealed together to prevent water leakage at the connection of the filter module 31. This excellent sealing performance ensures that the water flow fully contacts the filter medium as it passes through each filter module 31, avoiding insufficient filtration or water contamination caused by leakage, thereby improving filtration efficiency and water safety. It should be noted that the above-mentioned sealing connection can use a sealing ring or sealant.

[0046] In one embodiment, the filter assembly 3 includes two filter modules 31, which are respectively configured as a primary filter module 315 and a secondary filter module 316. The internal water channels of the primary filter module 315 and the secondary filter module 316 form a water channel structure. The end of the primary filter module 315 away from the secondary filter module 316 is connected to the end cap 2, and the internal water channel of the primary filter module 315 is connected to the first water inlet 12. The end of the secondary filter module 316 away from the primary filter module 315 is connected to the inner wall of the cavity 11, and the internal water channel of the secondary filter module 316 is connected to the second water inlet 21.

[0047] In the above structure, the first water inlet 12 is the water inlet, and the second water inlet 21 is the water outlet. The primary filter module 315 typically acts as a coarse filtration module, responsible for removing large particles, sediment, and suspended solids from the water, reducing the filtration burden on subsequent filter modules 31. The secondary filter module 316 acts as a fine filtration module, further removing fine particles, bacteria, viruses, and organic matter from the water, ensuring water purity. This tiered filtration method allows each filter module 31 to fully utilize its filtration function, improving the overall filtration effect. The primary filter module 315 can use a PP cotton filter element, and the secondary filter module 316 can use a carbon fiber filter element (carbon rod or activated carbon).

[0048] In one embodiment, the filter assembly 3 includes three filter modules 31, which are respectively configured as a primary filter module 315, a secondary filter module 316, and a tertiary filter module 317. The primary filter module 315, the secondary filter module 316, and the tertiary filter module 317 are stacked along the length of the cavity 11, and the internal water channels of the primary filter module 315, the secondary filter module 316, and the tertiary filter module 317 form a water channel structure. The end of the primary filter module 315 away from the secondary filter module 316 is connected to the end cap 2, and the internal water channel of the primary filter module is connected to the first water inlet 12. The end of the tertiary filter module 317 away from the secondary filter module 316 is connected to the inner wall of the cavity 11, and the internal water channel of the tertiary filter module 317 is connected to the second water inlet 21.

[0049] In the above structure, the first water inlet 12 is the water inlet, and the second water inlet 21 is the water outlet. The three filter modules 31 can filter pollutants of different particle sizes and types. The first-stage filter module 315 mainly removes large particulate impurities and suspended solids, the second-stage filter module 316 further filters out bacteria, viruses, colloids, large organic molecules, and other small particles in the water, and the third-stage filter module 317 can further remove odors, residual chlorine, organic matter, etc., improving the taste and purity of the water. This multi-stage filtration method can more comprehensively purify water quality and meet users' high standards for drinking water. For example, the first-stage filter module 315 can use a PP cotton filter, the second-stage filter module 316 can use an ultrafiltration filter, and the third-stage filter module 317 can use a carbon fiber filter (carbon rod or activated carbon). The stacked arrangement of the three filter modules 31 allows the water flow to pass through each module sequentially according to a predetermined path, rationally allocating the filtration task. The primary filter module 315 undertakes most of the coarse filtration task, reducing the burden on subsequent modules; the secondary filter module 316 removes fine particles and also supplements the filtration effect of the primary filter module 315; the tertiary filter module 317 focuses on deep purification to ensure high water quality standards.

[0050] In one embodiment, the filter assembly 3 includes four filter modules 31, which are respectively configured as a primary filter module 315, a secondary filter module 316, a tertiary filter module 317, and a quaternary filter module 318. The primary filter module 315, the secondary filter module 316, the tertiary filter module 317, and the quaternary filter module 318 are stacked along the length of the cavity 11, and the internal water channels of the primary filter module 315, the secondary filter module 316, the tertiary filter module 317, and the quaternary filter module 318 form a water channel structure. The end of the primary filter module 315 away from the secondary filter module 316 is connected to the end cap 2, and the internal water channel of the primary filter module 315 is connected to the first water inlet 12. The end of the quaternary filter module 318 away from the tertiary filter module 317 is connected to the inner wall of the cavity 11, and the internal water channel of the quaternary filter module 318 is connected to the second water inlet 21.

[0051] In the above structure, the first water inlet 12 is the water inlet, and the second water inlet 21 is the water outlet. The four filter modules 31 can perform more precise filtration for pollutants of different particle sizes and types. The first-stage filter module 315 mainly removes large particles and suspended solids; the second-stage filter module 316 adsorbs odors, discoloration, residual chlorine, some organic matter, and some heavy metals from the water; the third-stage filter module 317 further filters out bacteria, viruses, colloids, and large organic molecules; and the fourth-stage filter module 318 further removes odors, residual chlorine, and organic matter, improving the taste and purity of the water. This multi-stage filtration method can more comprehensively purify water quality and meet users' high standards for drinking water. Water enters from the bottom of the filter cartridge, first passing through the first-stage coarse filter cartridge to remove large particulate impurities; then it enters the second-stage activated carbon filter cartridge to adsorb odors and organic matter; next, it passes through the third-stage ultrafiltration filter cartridge to filter out bacteria and viruses; finally, it passes through the fourth-stage post-carbon rod filter cartridge to further improve the taste and purity of the water. For example, the first-stage filter cartridge 315 can be a PP cotton filter cartridge, the second-stage filter cartridge 316 can be an activated carbon filter cartridge, the third-stage filter cartridge 317 can be an ultrafiltration filter cartridge, and the fourth-stage filter cartridge 318 can be a post-carbon rod filter cartridge. This four-stage filtration system effectively removes various pollutants from the water, ensuring the quality and safety of the output water and meeting users' needs for healthy drinking water. At the same time, the reasonable filtration sequence and stage setting allow each filter cartridge to fully perform its function, improving the efficiency and lifespan of the entire filtration system. It should be noted that the number and type of filter cartridges in the filter cartridge modules 31 can be set according to requirements.

[0052] In one embodiment, the end cap 2 is threadedly connected to the end of the filter bottle 1 that has an opening. By rotating the end cap 2, the internal thread structure of the end cap 2 is tightly engaged with the external thread structure of the filter bottle 1, which can effectively prevent water leakage at the connection point, ensuring the stability of the filtration process and the safety of the water quality; at the same time, it is convenient to disassemble the end cap 2 from the filter bottle 1 and replace the filter element module 31.

[0053] The technical solution of this application employs two or more filter element modules 31 to form a filter assembly 3. All filter element modules 31 are stacked along the length of the filter bottle 1 cavity 11 to form a series water channel structure. The fluid to be filtered enters the cavity 11 from one of the first water inlet 12 or the second water inlet 21, flows through the water channel structure of the filter assembly 3, achieves filtration, and forms filtered fluid. The filtered fluid is finally output from the other of the first water inlet 12 or the second water inlet 21 to the outside of the filter element structure. When one of the filter element modules 31 fails, only that module needs to be replaced, without replacing the entire filter assembly. Since the filter element modules 31 can be replaced individually, the user only needs to replace them according to actual needs. Replacing damaged or malfunctioning filter module 31 not only significantly reduces replacement costs but also decreases the number of waste filter elements generated from replacing the entire filter element, thus reducing the environmental burden. The modular design of the filter module 31 makes it easier to disassemble and classify waste filter elements, facilitating recycling. Users can sort the replaced filter module 31 according to its material and hand it over to a specialized recycling facility, improving the recycling rate of the filter structure. Furthermore, the detachable connection between the end cap 2 and the open end of the filter bottle 1 allows users to easily open the end cap 2 for convenient replacement of the filter module 31, reducing the complexity of the replacement process and the required tools, further lowering replacement costs.

[0054] This application also proposes a water purification device, which includes a filter element structure. The specific structure of the filter element structure is as described in the above embodiments. Since this water purification device uses all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0055] The above are merely exemplary embodiments of this application and do not limit the patent scope of this application. Any equivalent structural transformations made based on the technical concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. A filter element structure, characterized in that, include: A filter bottle, wherein the filter bottle has an internal cavity with an opening; and a first water inlet is provided at the end of the filter bottle away from the opening, the first water inlet communicating with the cavity. An end cap is provided, which is detachably connected to one end of the filter bottle that has an opening. The end cap is provided with a second water inlet, which communicates with the cavity. A filter assembly is disposed within the cavity; the filter assembly includes two or more filter cartridge modules, which are stacked along the length of the cavity; the internal water channels of the two or more filter cartridge modules form a series water channel structure, and the two ends of the water channel structure are respectively connected to the first water inlet and the second water inlet.

2. The filter element structure as described in claim 1, characterized in that, The end cap has a first limiting groove on its inner side; the filter module that abuts against the end cap in the filter assembly is a filter module at the tail end, the filter module at the tail end has a first connecting part, the first connecting part is engaged with the first limiting groove; the first limiting groove is connected to the second water inlet, the first connecting part has a first fluid flow channel inside, the first fluid flow channel is connected to the internal water channel of the filter module at the tail end.

3. The filter element structure as described in claim 2, characterized in that, The filter bottle has a second limiting groove on the inner wall of the side away from the end cap; the filter module farthest from the tail end in the filter assembly is set as the first end filter module; the first end filter module is at least partially engaged with the second limiting groove, and the internal water passage of the first end filter module is connected to the first water inlet.

4. The filter element structure as described in claim 3, characterized in that, The first connecting part is sealed to the first limiting groove; and / or, The filter module at the first end is at least partially sealed to the second limiting groove.

5. The filter element structure as described in claim 3, characterized in that, The second limiting groove has an extension section inside, and the filter module at the first end has a third limiting groove, and the extension section is engaged with the third limiting groove.

6. The filter element structure as described in claim 5, characterized in that, The extension section has a second fluid channel inside, which is connected to the first water inlet.

7. The filter element structure according to any one of claims 1 to 6, characterized in that, Between two adjacent filter modules, one filter module is provided with a fourth limiting groove, and the other filter module is provided with a second connecting part. The second connecting part is engaged with the fourth limiting groove, and a second fluid channel is provided in the second connecting part. The second fluid channel is connected to the adjacent filter modules respectively.

8. The filter element structure according to any one of claims 1 to 6, characterized in that, The filtration assembly includes two filter modules, which are respectively configured as a primary filter module and a secondary filter module. The internal water channels of the primary and secondary filter modules form the water channel structure. The end of the primary filter module away from the secondary filter module is connected to the end cap, and the internal water channel of the primary filter module is connected to the first water inlet. The end of the secondary filter module away from the primary filter module is connected to the inner wall of the cavity, and the internal water channel of the secondary filter module is connected to the second water inlet. The filtration assembly includes three filter modules, which are respectively configured as a primary filter module, a secondary filter module, and a tertiary filter module. The primary, secondary, and tertiary filter modules are stacked along the length of the cavity, and their internal water channels form the water channel structure. The end of the primary filter module furthest from the secondary filter module is connected to the end cap, and its internal water channel is connected to the first water inlet. The end of the tertiary filter module furthest from the secondary filter module is connected to the inner wall of the cavity, and its internal water channel is connected to the second water inlet. The filtration assembly includes four filter modules, which are respectively configured as a primary filter module, a secondary filter module, a tertiary filter module, and a quaternary filter module. The primary, secondary, tertiary, and quaternary filter modules are stacked along the length of the cavity, and their internal water channels form the water channel structure. The end of the primary filter module away from the secondary filter module is connected to the end cap, and its internal water channel is connected to the first water inlet. The end of the quaternary filter module away from the tertiary filter module is connected to the inner wall of the cavity, and its internal water channel is connected to the second water inlet.

9. The filter element structure according to any one of claims 1 to 6, characterized in that, The end cap is threaded to the end of the filter bottle that has an opening.

10. A water purification device, characterized in that, Includes the filter element structure as described in any one of claims 1 to 9.

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