Filter element device for water purification

Abstract

The utility model discloses a filter element device for water purification, which comprises a top gland assembly, a barrel and a filter element handle seat, and a rear filter element assembly with the top side communicated with the inside of the top gland assembly is sleeved at the top of the barrel; the middle part of the barrel is sleeved with a reverse osmosis membrane filter element assembly of which the top side is propped against and communicated with the lower side of the rear filter element assembly; the top side of the composite filter element assembly abuts against and is communicated with the lower side of the reverse osmosis membrane filter element assembly, and the bottom side of the composite filter element assembly is sealed by the filter element handle seat sealing cover, or the composite filter element assembly circumferentially sleeves the periphery of the reverse osmosis membrane filter element assembly; the multiple filter elements are connected in series, the structure is simple, the composite filter element is convenient to assemble, the assembly efficiency is effectively improved, and the filter element size is reduced.

Description

[Technical Field]

[0001] This utility model belongs to the field of water purification equipment technology, specifically relating to a filter cartridge device for water purification. [Background Technology]

[0002] The filter cartridge is a key component in water purification, used to filter impurities and harmful substances in the water to achieve a certain level of cleanliness.

[0003] Traditional reverse osmosis water purifiers on the market today all have multiple filter stages, resulting in a very large overall size and significant space wastage. Furthermore, because the lifespans of the multiple filter stages vary, service personnel need to make frequent visits to replace them, leading to high product maintenance costs.

[0004] Therefore, in order to reduce the size, the pre-filter, reverse osmosis membrane filter, and post-filter are usually integrated into a filter housing to form a composite filter. However, the pre-filter, reverse osmosis membrane filter, and post-filter all have multiple components. If each component of the pre-filter, reverse osmosis membrane filter, and post-filter is installed into the filter housing in sequence, it will take a long time, which will make the assembly efficiency of the composite filter relatively low. [Utility Model Content]

[0005] This utility model provides a filter cartridge device for water purification, in which multiple filter cartridges are connected in series. The structure is simple, the assembly of composite filter cartridges is convenient, and the assembly efficiency is effectively improved and the filter cartridge volume is reduced.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A filter cartridge device for water purification includes a top pressure cap assembly, a cylindrical body, and a filter cartridge handle seat. The top pressure cap assembly is threadedly connected to the upper end of the cylindrical body, and the filter cartridge handle seat is screw-welded to the lower end of the cylindrical body.

[0008] The top cover assembly is provided with water inlet and outlet channels that communicate with the outside.

[0009] The top of the cylinder is fitted with a post-filter assembly whose top side communicates with the interior of the top cover assembly;

[0010] The middle part of the cylinder is fitted with a reverse osmosis membrane filter element assembly whose top side abuts against and is connected to the lower side of the post-filter element assembly;

[0011] The inner wall of the cylinder is fitted with a composite filter element assembly, which is connected to the lower side of the reverse osmosis membrane filter element assembly on the top side and sealed by the filter element handle seat on the bottom side, or is circumferentially fitted around the reverse osmosis membrane filter element assembly.

[0012] The post-filter assembly, the reverse osmosis membrane filter assembly, and the composite filter assembly are connected to form an annular raw water channel between themselves and the inner wall of the cylinder, allowing external tap water to enter. External tap water enters the composite filter assembly through the raw water channel from the inner wall or bottom, is filtered, and then flows out from the upper side of the outer or inner wall. After being filtered by the composite filter assembly, it enters the reverse osmosis membrane filter assembly from the bottom. The pure water formed after being filtered by the reverse osmosis membrane filter assembly enters the post-filter assembly directly from the bottom side through the central channel, and after being filtered by the post-filter assembly, it flows out from the outlet on the top pressure cap assembly.

[0013] Preferably, the composite filter assembly includes a composite lower end cap, a cylindrical composite filter element, and a composite upper end cap, wherein the composite upper end cap and the composite lower end cap are mated together to form a receiving cavity that encloses the composite filter element.

[0014] Preferably, the upper periphery of the composite lower end cap is nested and mated with the circumferentially extending fastening part of the lower end cap of the reverse osmosis membrane provided at the lower end of the reverse osmosis membrane filter element assembly. The upper periphery of the composite upper end cap and the lower inner wall of the reverse osmosis membrane lower end cap form a composite water filtration outlet channel that allows water to exit from the upper outer wall of the composite filter element and pass through the bottom surface of the lower end cap of the reverse osmosis membrane to enter from the bottom of the reverse osmosis membrane filter element.

[0015] Preferably, the reverse osmosis membrane filter assembly includes a cylindrical reverse osmosis membrane filter element and a lower end cap of the reverse osmosis membrane. The central axis of the reverse osmosis membrane filter element forms a central channel with a partition at the bottom. The lower end of the post-filter assembly has a post-inlet connector that is inserted into the central channel at the top of the reverse osmosis membrane filter element for introducing pure water.

[0016] Preferably, the post-filter assembly includes a wastewater end shell, a rear upper end cover, a post-filter element, a rear lower end cover, and a raw water end lower shell. The rear upper end cover and the rear lower end cover are fitted together to form an inner cavity that seals and encloses the post-filter element. The lower end of the raw water end lower shell has a top cover extending circumferentially to seal the top of the reverse osmosis membrane filter element on the reverse osmosis membrane filter assembly and is connected to it by wrapping with water-resistant adhesive tape. The wastewater end shell and the raw water end lower shell are fitted together to form an inner cavity that seals and encloses the rear upper end cover and the rear lower end cover after they are joined together, as well as a wastewater flow channel that facilitates wastewater discharge.

[0017] Preferably, the top pressure cover assembly includes a top side pressure cover, an ultrasonic pressure cover, and a locking cover. The locking cover is rotatably locked and installed on the outer wall of the top of the cylinder. The top side pressure cover is respectively provided with a tap water inflow channel, a pure water outflow channel, and a wastewater outflow channel. The ultrasonic pressure cover is fitted into the inner cavity of the locking cover and is sealed by the top side pressure cover.

[0018] Preferably, the top of the cylinder is also equipped with three sets of channel stop covers and self-locking springs that are connected to the tap water inflow channel, pure water outflow channel and wastewater outflow channel corresponding to the top side cover, and control the self-locking closure of their respective channels.

[0019] Preferably, the top side pressure cover and the outer circumferential edge of the locking cover are locked together by a plurality of screws.

[0020] Preferably, the post-filter assembly includes an upper outer shell for raw water, an outer shell for wastewater, a post-filter, a lower end cap for the post-filter, and a lower outer shell for raw water. The wastewater outer shell and the lower end cap for the post-filter are fitted together to form an inner cavity that seals and encloses the post-filter. The lower end of the lower outer shell for the raw water extends circumferentially with a top cover for sealing the top of the reverse osmosis membrane filter in the reverse osmosis membrane filter assembly and is connected to each other by wrapping with water-based adhesive tape. The upper outer shell for the raw water and the lower outer shell for the raw water are fitted together to form an inner cavity that seals and encloses the wastewater outer shell and the lower end cap for the post-filter, as well as a wastewater flow channel that facilitates wastewater discharge.

[0021] Preferably, the composite filter element assembly includes a composite upper sleeve, a cylindrical composite filter element, and a composite lower sleeve. The composite filter element is annularly fitted around the circumferential periphery of the reverse osmosis membrane filter element in the reverse osmosis membrane filter element assembly. The top side of the composite upper sleeve abuts against and receives the circumferential bottom side of the upper shell at the raw water end, and the top side of the composite upper sleeve is circumferentially recessed with multiple raw water inlets to facilitate the entry of tap water from the raw water channel on the outer wall side of the upper shell at the raw water end into the inner wall side of the composite filter element.

[0022] The top sleeve of the composite filter element is installed at the bottom end of the upper composite sleeve, and the bottom sleeve of the composite filter element is installed on the lower composite sleeve.

[0023] The lower side of the composite lower sleeve is also provided with a support cylinder that is fitted around the outside of the reverse osmosis membrane filter element on the reverse osmosis membrane filter element assembly and whose lower end abuts against the inner side of the filter element handle seat to support the entire composite filter element assembly. The top or bottom end face of the support cylinder is circumferentially recessed with multiple composite filter water inlets to facilitate the entry of filtered water exported from the outer wall of the composite filter element.

[0024] A composite filtration channel is formed between the inner wall of the support cylinder and the outer wall of the reverse osmosis membrane filter element on the reverse osmosis membrane filter element assembly, which facilitates the introduction of composite filtration water from the bottom of the reverse osmosis membrane filter element assembly.

[0025] Preferably, the reverse osmosis membrane filter element assembly includes a cylindrical reverse osmosis membrane filter element, the central axis of which forms a through-channel, and the lower bottom center of the post-filter element assembly has a post-inlet connector inserted into the central channel at the top of the reverse osmosis membrane filter element for introducing pure water.

[0026] The beneficial effects of this utility model are:

[0027] The top pressure cap assembly is equipped with three sets of tap water inflow channels, pure water outflow channels, and wastewater outflow channels. After the post-filter assembly and reverse osmosis membrane filter assembly are connected, they form an annular raw water channel between the filter assembly and the inner wall of the cylinder for external tap water to enter. External tap water enters from the bottom of the composite filter assembly through the raw water channel and flows out from the upper side after filtration, or external tap water enters from the inner wall of the composite filter assembly through the raw water channel and is discharged from the outer wall. Then, the discharged composite filtered water enters from the bottom of the reverse osmosis membrane filter assembly. After being filtered by the reverse osmosis membrane filter assembly, the pure water formed flows out from the central channel of the reverse osmosis membrane filter assembly. Then, it directly enters the post-filter from the bottom side. After being filtered by the post-filter, it flows out from the pure water outflow channel on the top pressure cap assembly. Wastewater is discharged directly through the wastewater outflow channel.

[0028] The entire filter element device adopts a series or set arrangement of three filter element components connected vertically, which is simple in structure, facilitates the assembly of composite filter elements, and effectively improves assembly efficiency and reduces filter element volume. [Attached Image Description]

[0029] Figure 1 This is an exploded structural diagram of Embodiment 1 of this utility model;

[0030] Figure 2 This is a front cross-sectional structural diagram of Embodiment 1 of this utility model;

[0031] Figure 3 This is a side view cross-sectional structural diagram of Embodiment 1 of this utility model;

[0032] Figure 4 This is a top-view three-dimensional structural diagram of Embodiment 1 of this utility model;

[0033] Figure 5 This is a bottom-view three-dimensional structural diagram of Embodiment 1 of this utility model;

[0034] Figure 6 This is an exploded structural diagram of Embodiment 2 of this utility model;

[0035] Figure 7 This is a front cross-sectional view of the structure after removing the top pressure cover assembly in Embodiment 2 of this utility model;

[0036] Figure 8This is a frontal perspective three-dimensional cross-sectional view of the structure after removing the top pressure cover assembly in Embodiment 2 of this utility model;

[0037] Figure 9 This is a side-view perspective cross-sectional view of the structure after removing the top pressure cover assembly in Embodiment 2 of this utility model;

[0038] Figure 10 This is a top-view perspective view of the three-dimensional structure after removing the top pressure cover assembly in Embodiment 2 of this utility model;

[0039] The present invention will be further described below with reference to the accompanying drawings and embodiments.

Detailed Implementation Methods

[0040] Example 1

[0041] A filter cartridge device for water purification, used in water purifiers, such as... Figures 1 to 5 As shown, the device includes a top pressure cap assembly 1, a cylindrical body 2, and a filter element handle seat 3. The top pressure cap assembly 1 is threadedly connected to the upper end of the cylindrical body 2, and the filter element handle seat 3 is welded to the lower end of the cylindrical body 2. The top pressure cap assembly 1 is provided with a tap water inflow channel, a pure water outflow channel, and a wastewater outflow channel that communicate with the outside. A post-filter element assembly 6, whose top side communicates with the inside of the top pressure cap assembly 1, is installed on the top of the cylindrical body 2. A reverse osmosis membrane filter element assembly 7, whose top side abuts against and communicates with the lower side of the post-filter element assembly 6, is installed in the middle of the cylindrical body 2. A filter element assembly 7, whose top side abuts against and communicates with the lower side of the reverse osmosis membrane filter element assembly 7, and whose bottom side is made of filter material, is installed at the bottom of the cylindrical body 2. The core handle seat 3 is a sealed composite filter element assembly 8; wherein, after the post-filter element assembly 6, the reverse osmosis membrane filter element assembly 7 and the composite filter element assembly 8 are connected, an annular raw water channel 9 is formed between them and the inner wall of the cylinder 2 for the entry of external tap water. External tap water enters from the bottom of the composite filter element assembly 8 through the raw water channel, flows out from the upper side of the inner wall and enters from the bottom of the reverse osmosis membrane filter element assembly 7. The pure water formed after being filtered by the reverse osmosis membrane filter element assembly 7 enters the post-filter element assembly 6 directly from the bottom side through the central channel 10 in the middle, and flows out from the outlet on the top pressure cover assembly 1 after being filtered by the post-filter element assembly 6.

[0042] like Figures 1 to 3As shown, the top pressure cover assembly 1 includes a top side pressure cover 1a, an ultrasonic pressure cover 1b, and a locking cover 1c. The locking cover 1c is rotatably locked and installed on the outer wall of the top of the cylinder 2. The top side pressure cover 1a is provided with a tap water inflow channel, a pure water outflow channel, and a wastewater outflow channel. The top of the cylinder 2 is also equipped with three sets of channel stop covers 4 and self-locking springs 5, which are respectively connected to the tap water inflow channel, pure water outflow channel, and wastewater outflow channel corresponding to the top side pressure cover 1a and control the self-locking closure of their respective channels. The ultrasonic pressure cover 1b and the three sets of channel stop covers 4 and self-locking springs 5 ​​provided on its lower side are fitted into the inner cavity of the locking cover 1c and sealed by the top side pressure cover 1a. The top side pressure cover 1a and the locking cover 1c are locked together by multiple screws on their circumferential outer edges.

[0043] Continue as Figures 1 to 3 As shown, the composite filter element assembly 8 includes a composite lower end cap 80, a composite filter element 81, and a composite upper end cap 82. The composite filter element 81 is made of carbon rod wrapped with non-woven fabric. The composite upper end cap 82 and the composite lower end cap 80 are connected and fastened to form a cavity that encloses the composite filter element 81. The upper outer periphery of the composite lower end cap 80 is also nested and connected with the lower circumferentially extending fastening part of the reverse osmosis membrane lower end cap 71 provided at the lower end of the reverse osmosis membrane filter element assembly 7. The upper outer periphery of the composite upper end cap 82 is also connected with the lower inner wall of the reverse osmosis membrane lower end cap 71 to form a composite filtered water outlet channel 11, which allows water to exit from the upper outer wall of the composite filter element 81 and pass through the bottom surface of the reverse osmosis membrane lower end cap 71 to enter from the bottom of the reverse osmosis membrane filter element.

[0044] Continue as Figures 1 to 3 As shown, the reverse osmosis membrane filter assembly 7 includes a cylindrical reverse osmosis membrane filter element 70 and a reverse osmosis membrane lower end cap 71. The reverse osmosis membrane filter element 70 forms a central channel 10 with a partition at the bottom along its central axis. A post-filter assembly 6 has a post-inlet connector 72 that is inserted into the central channel 10 at the top of the reverse osmosis membrane filter element 70 for the introduction of pure water.

[0045] Continue as Figures 1 to 3 As shown, the post-filter assembly 6 includes a wastewater end shell 60, a rear upper end cover 61, a post-filter element 62, a rear lower end cover 63, and a raw water end lower shell 64. The rear upper end cover 61 and the rear lower end cover 63 are fitted together to form an inner cavity that seals and encloses the post-filter element 62. The lower end of the raw water end lower shell 64 extends circumferentially with a top cover for sealing the top end of the reverse osmosis membrane filter element 70 on the reverse osmosis membrane filter assembly 7 and is connected to each other by wrapping with water-based adhesive tape. The corresponding lower end cover 7 extends circumferentially with a bottom cover for sealing the bottom end of the reverse osmosis membrane filter element 70 and is connected to each other by wrapping with water-based adhesive tape. The wastewater end shell 60 and the raw water end lower shell 64 are fitted together to form an inner cavity that seals and encloses the rear upper end cover 61 and the rear lower end cover 63 and a wastewater flow channel that facilitates wastewater discharge.

[0046] In Example 1, during use, external tap water enters the filter from the bottom of the composite filter element assembly 8 through the raw water channel.

[0047] Water exiting from the upper outer wall of the composite filter element 81 passes through the composite water outlet channel 11, then through the bottom surface of the lower end cover 71 of the reverse osmosis membrane and enters from the bottom of the reverse osmosis membrane filter element 70. After being filtered by the reverse osmosis membrane filter element assembly, the pure water flows out from the central channel 10 of the reverse osmosis membrane filter element 70, and then directly enters the post-filter element 62 assembly from the bottom side. After being filtered by the post-filter element 62 assembly, it flows out from the pure water outlet channel on the top pressure cover assembly 1, while wastewater is directly discharged through the wastewater outlet channel.

[0048] Example 2

[0049] A filter cartridge device for water purification, such as Figures 6 to 10 As shown, the difference between this embodiment and Embodiment 1 is that the composite filter element assembly 8' is circumferentially fitted around the reverse osmosis membrane filter element assembly 7'. The reverse osmosis membrane filter element assembly 7' includes a cylindrical reverse osmosis membrane filter element 70'. The central axis of the reverse osmosis membrane filter element 70' forms a central channel 10' that runs vertically through the center, and the bottom end of the reverse osmosis membrane filter element 70' directly contacts the inner wall surface of the filter element handle seat 3.

[0050] like Figures 6 to 9 As shown, the high-efficiency post-filter assembly 6' includes a raw water end upper shell 60', a wastewater end shell 61', a post-filter 62', a post-filter lower end cover 63', and a raw water end lower shell 64'. The wastewater end shell 61' and the post-filter lower end cover 63' are fitted together to form an inner cavity that seals and encloses the post-filter 62'. The lower end of the raw water end lower shell 64' extends circumferentially with a top cover for sealing the top end of the reverse osmosis membrane filter 70' on the reverse osmosis membrane filter assembly 7' and is connected to each other by wrapping water-based adhesive tape. The raw water end upper shell 60' and the raw water end lower shell 64' are fitted together to form an inner cavity of the sealed wastewater end shell 61' and the post-filter lower end cover 63', as well as a wastewater flow channel for easy wastewater discharge.

[0051] like Figures 6 to 9As shown, the composite filter element assembly 8' includes a composite upper sleeve 80', a cylindrical composite filter element 81', and a composite lower sleeve 82'. The composite filter element 81' is annularly fitted around the circumferential periphery of the reverse osmosis membrane filter element on the reverse osmosis membrane filter element assembly 7'. In this embodiment, the composite filter element 81' is made of an inner annular scale inhibitor layer wrapped with non-woven fabric, achieving scale removal while effectively intercepting larger impurities and particles. The top side of the composite upper sleeve 80' abuts against and supports the circumferential bottom side of the raw water end upper shell 60', and the top side of the composite upper sleeve 80' has a circumferential recess with multiple raw water inlets 12 that facilitate the entry of tap water from the raw water channel 9' on the outer wall side of the raw water end upper shell 60' into the raw water inlet side of the composite filter element 81'. The top end of the composite filter element 81' is inserted and installed on the composite upper sleeve 82'. At the bottom of the sleeve 80', the bottom end of the composite filter element 81' is inserted and installed on the composite lower sleeve 82'; inside the cylinder 2 on the lower side of the composite lower sleeve 82', there is also a support cylinder 83' that is fitted around the outside of the reverse osmosis membrane filter element 70' on the reverse osmosis membrane filter element assembly 7' and whose lower end abuts against the inner side of the filter element handle seat 3 to support the entire composite filter element assembly 8'. The top and bottom surfaces of the support cylinder are recessed around the circumference and have multiple composite filter water inlet ports 13 to facilitate the entry of filtered water from the outer wall of the composite filter element 81'; between the inner wall of the support cylinder 83' and the outer wall of the reverse osmosis membrane filter element 70' on the reverse osmosis membrane filter element assembly 7', a composite filter water inlet channel 13 is formed to facilitate the entry of composite filter water from the bottom of the reverse osmosis membrane filter element assembly 7'. Among them, in the post-filter assembly 6', the lower end cap 63' extends from the center of the lower side and has a post-inlet connector 14 that is inserted into the center channel 10' at the top of the reverse osmosis membrane filter 70' for pure water introduction.

[0052] In this embodiment, after the post-filter assembly 6' and the reverse osmosis membrane filter assembly 7' are connected, an annular raw water channel 9' is formed between them and the inner wall of the cylinder 2 for the entry of external tap water. Then, the tap water in the raw water channel 9' enters from the inner wall of the cylindrical composite filter assembly 8', flows out from the outer wall of the composite filter assembly 8', is filtered by the composite filter assembly 8', moves down along the bottom inner wall of the cylinder 2, and enters from the bottom of the reverse osmosis membrane filter assembly 7'. The pure water formed after being filtered by the reverse osmosis membrane filter assembly 7' enters the post-filter assembly 6' directly from the bottom side through the central channel 10' in the middle, and flows out from the outlet on the top pressure cover assembly after being filtered by the post-filter assembly 6'.

[0053] The above-described embodiments are merely preferred embodiments of this utility model and are not intended to limit the scope of implementation of this utility model. Any obvious changes made to the shape, structure and principle of this utility model, as well as any other modifications that do not depart from the essence of this utility model, should be covered within the protection scope of this utility model.

Claims

1. A filter cartridge device for water purification, characterized in that... The device includes a top pressure cap assembly, a cylinder, and a filter element handle seat. The top pressure cap assembly is threadedly connected to the upper end of the cylinder, and the filter element handle seat is screw-welded to the lower end of the cylinder. The top cover assembly is provided with water inlet and outlet channels that communicate with the outside. The top of the cylinder is fitted with a post-filter assembly whose top side communicates with the interior of the top cover assembly; The middle part of the cylinder is fitted with a reverse osmosis membrane filter element assembly whose top side abuts against and is connected to the lower side of the post-filter element assembly; The inner wall of the cylinder is fitted with a composite filter element assembly, which is connected to the lower side of the reverse osmosis membrane filter element assembly on the top side and sealed by the filter element handle seat on the bottom side, or is circumferentially fitted around the reverse osmosis membrane filter element assembly. The post-filter assembly, the reverse osmosis membrane filter assembly, and the composite filter assembly are connected to form an annular raw water channel between themselves and the inner wall of the cylinder, allowing external tap water to enter. External tap water enters the composite filter assembly through the raw water channel from the inner wall or bottom, is filtered, and then flows out from the upper side of the outer or inner wall. After being filtered by the composite filter assembly, it enters the reverse osmosis membrane filter assembly from the bottom. The pure water formed after being filtered by the reverse osmosis membrane filter assembly enters the post-filter assembly directly from the bottom side through the central channel, and after being filtered by the post-filter assembly, it flows out from the outlet on the top pressure cap assembly.

2. A filter cartridge device for water purification according to claim 1, characterized in that, The composite filter assembly includes a composite lower end cap, a cylindrical composite filter element, and a composite upper end cap. The composite upper end cap and the composite lower end cap are joined together to form a receiving cavity that encloses the composite filter element.

3. A filter cartridge device for water purification according to claim 2, characterized in that, The upper outer periphery of the composite lower end cap is nested and connected with the circumferentially extending fastening part of the lower end cap of the reverse osmosis membrane provided at the lower end of the reverse osmosis membrane filter element assembly. The upper outer periphery of the composite upper end cap and the lower inner wall of the reverse osmosis membrane lower end cap form a composite water filtration outlet channel that allows water to exit from the upper outer wall of the composite filter element and pass through the bottom surface of the lower end cap of the reverse osmosis membrane to enter from the bottom of the reverse osmosis membrane filter element.

4. A filter cartridge device for water purification according to claim 1, characterized in that, The reverse osmosis membrane filter assembly includes a cylindrical reverse osmosis membrane filter element and a lower end cap for the reverse osmosis membrane. The central axis of the reverse osmosis membrane filter element forms a central channel with a partition at the bottom. The lower end of the post-filter assembly has a post-inlet connector that is inserted into the central channel at the top of the reverse osmosis membrane filter element for the introduction of pure water.

5. A filter cartridge device for water purification according to claim 1, characterized in that, The post-filter assembly includes a wastewater end shell, a rear upper end cover, a post-filter element, a rear lower end cover, and a raw water end lower shell. The rear upper end cover and the rear lower end cover are fitted together to form an inner cavity that seals and encloses the post-filter element. The lower end of the raw water end lower shell has a top cover extending circumferentially to seal the top of the reverse osmosis membrane filter element on the reverse osmosis membrane filter assembly and is connected to it by wrapping with water-resistant adhesive tape. The wastewater end shell and the raw water end lower shell are fitted together to form an inner cavity that seals and encloses the rear upper end cover and the rear lower end cover after they are joined together, as well as a wastewater flow channel that facilitates wastewater discharge.

6. A filter cartridge device for water purification according to claim 1, characterized in that, The top cover assembly includes a top side cover, an ultrasonic cover, and a locking cover. The locking cover is rotatably locked and installed on the outer wall of the top of the cylinder. The top side cover is respectively provided with a tap water inflow channel, a pure water outflow channel, and a wastewater outflow channel. The ultrasonic cover is fitted into the inner cavity of the locking cover and is sealed by the top side cover.

7. A filter cartridge device for water purification according to claim 6, characterized in that, The top of the cylinder is also equipped with three sets of channel stop covers and self-locking springs that are connected to the tap water inflow channel, pure water outflow channel and wastewater outflow channel corresponding to the top side cover, and control the self-locking closure of their respective channels.

8. A filter cartridge device for water purification according to claim 1, characterized in that, The post-filter assembly includes an upper outer shell for raw water, an outer shell for wastewater, a post-filter, a lower end cap for the post-filter, and a lower outer shell for raw water. The wastewater outer shell and the lower end cap for the post-filter are fitted together to form an inner cavity that seals and encloses the post-filter. The lower end of the lower outer shell for the raw water extends circumferentially to form a top cover that seals the top of the reverse osmosis membrane filter on the reverse osmosis membrane filter assembly and is connected to it by wrapping with water-resistant adhesive tape. The upper outer shell for the raw water and the lower outer shell for the raw water are fitted together to form an inner cavity that seals and encloses the wastewater outer shell and the lower end cap for the post-filter, as well as a wastewater flow channel that facilitates wastewater discharge.

9. A filter cartridge device for water purification according to claim 8, characterized in that, The composite filter element assembly includes a composite upper sleeve, a cylindrical composite filter element, and a composite lower sleeve. The composite filter element is annularly fitted around the circumferential periphery of the reverse osmosis membrane filter element in the reverse osmosis membrane filter element assembly. The top side of the composite upper sleeve abuts against and receives the circumferential bottom side of the upper shell at the raw water end, and the top side of the composite upper sleeve is circumferentially recessed with multiple raw water inlets that facilitate the entry of tap water from the raw water channel on the outer wall side of the upper shell at the raw water end into the inner wall side of the composite filter element. The top sleeve of the composite filter element is installed at the bottom end of the upper composite sleeve, and the bottom sleeve of the composite filter element is installed on the lower composite sleeve. The lower side of the composite lower sleeve is also provided with a support cylinder that is fitted around the outside of the reverse osmosis membrane filter element on the reverse osmosis membrane filter element assembly and whose lower end abuts against the inner side of the filter element handle seat to support the entire composite filter element assembly. The top or bottom end face of the support cylinder is circumferentially recessed with multiple composite filter water inlets to facilitate the entry of filtered water exported from the outer wall of the composite filter element. A composite filtration channel is formed between the inner wall of the support cylinder and the outer wall of the reverse osmosis membrane filter element on the reverse osmosis membrane filter element assembly, which facilitates the introduction of composite filtration water from the bottom of the reverse osmosis membrane filter element assembly.

10. A filter cartridge device for water purification according to claim 8, characterized in that, The reverse osmosis membrane filter assembly includes a cylindrical reverse osmosis membrane filter element, with a central channel running vertically through the center of the reverse osmosis membrane filter element. The bottom center of the post-filter assembly has a post-inlet connector that is inserted into the central channel at the top of the reverse osmosis membrane filter element for introducing pure water.

Images