Filter element device for water purification

Abstract

The filter element device comprises a top gland assembly, a barrel and a filter element handle seat, the top of the barrel is sleeved with a rear filter element assembly, and the top side of the rear filter element assembly is communicated with the interior of the top gland assembly; 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] The present invention belongs to the technology of water purification appliances, and particularly relates to a filter element device for water purification.

Background Art

[0002] The filter element device is a key component for purifying water sources, used to filter impurities and harmful substances in water to make the water reach a certain cleanliness level.

[0003] Currently, traditional reverse osmosis water purifiers on the market all have multiple filter elements, resulting in a very large overall volume of the machine and a great waste of space. Moreover, since the service lives of the multiple filter elements are different, service personnel need to visit multiple times to replace them, and the product maintenance cost is very high.

[0004] Therefore, in order to reduce the volume, the pre-filter element, the reverse osmosis membrane filter element, and the post-filter element are usually integrated into a filter housing to form a composite filter element. However, the pre-filter element, the reverse osmosis membrane filter element, and the post-filter element all have multiple components. If the components of the pre-filter element, the reverse osmosis membrane filter element, and the post-filter element are sequentially installed in the filter housing, it will take a long time, which will result in a relatively low assembly efficiency of the composite filter element.

Summary of the Invention

[0005] The present invention provides a filter element device for water purification, in which multiple filter elements are arranged in series, with a simple structure, facilitating the assembly of the composite filter element, effectively improving the assembly efficiency and reducing the volume of the filter element.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A filter element device for water purification, comprising a top pressing cover assembly, a cylinder body, and a filter element handle seat. The top pressing cover assembly is threadedly buckled and connected to the upper end of the cylinder body, and the filter element handle seat is rotationally welded and connected to the lower end of the cylinder body;

[0008] An inlet and outlet water channel communicating with the outside is provided on the top pressing cover assembly;

[0009] A post-filter element assembly with its top side communicating with the inside of the top pressing cover assembly is sleeved on the top of the cylinder body;

[0010] A reverse osmosis membrane filter element assembly with its top side abutted and communicating with the lower side of the post-filter element assembly is sleeved in the middle of the cylinder body;

[0011] A composite filter element assembly with its top side abutted and communicating with the lower side of the reverse osmosis membrane filter element assembly and its bottom side sealed by the filter element handle seat, or circumferentially sleeved around the reverse osmosis membrane filter element assembly, is sleeved on the inner wall of the cylinder body;

[0012] Among them, after the post-filter element assembly, the reverse osmosis membrane filter element assembly, and the composite filter element assembly are docked, an annular raw water channel for external tap water to enter is formed between them and the inner wall of the cylinder body. The external tap water enters from the inner wall or bottom of the composite filter element assembly through the raw water channel, flows out from the outer wall or the upper side of the inner wall of the composite filter element assembly after filtration, enters the reverse osmosis membrane filter element assembly from the bottom after passing through the composite filter element assembly, and the pure water formed after passing through the reverse osmosis membrane filter element assembly directly enters the post-filter element assembly from the bottom through the central channel in the middle, and flows out from the outlet on the top pressure cover assembly after passing through the post-filter element assembly.

[0013] Preferably, the composite filter element assembly includes a composite lower end cover, a cylindrical composite filter element, and a composite upper end cover. The composite upper end cover and the composite lower end cover are docked and buckled up and down to form a receiving cavity for wrapping the composite filter element.

[0014] Preferably, the outer periphery of the upper side of the composite lower end cover is also nested and docked with the circumferential outer periphery extending and buckling portion provided at the lower end of the reverse osmosis membrane lower end cover of the reverse osmosis membrane filter element assembly. A composite filter water outlet channel is formed between the outer periphery of the upper side of the composite upper end cover and the inner wall of the lower side of the reverse osmosis membrane lower end cover, through which the water filtered from the outer wall of the upper part of the composite filter element passes through the bottom surface of the reverse osmosis membrane lower end cover and enters the bottom of the reverse osmosis membrane filter element.

[0015] Preferably, the reverse osmosis membrane filter element assembly includes a cylindrical reverse osmosis membrane filter element and a reverse osmosis membrane lower end cover. A central channel with a partition at the bottom is formed along the central axis of the reverse osmosis membrane filter element. A post-import joint for introducing pure water is extended from the center of the bottom end of the post-filter element assembly and inserted into the central channel at the top of the reverse osmosis membrane filter element.

[0016] Preferably, the post-filter element assembly includes a waste water end outer shell, a post upper end cover, a post filter element, a post lower end cover, and a raw water end lower outer shell. The post upper end cover and the post lower end cover are sleeved and docked up and down to form an inner cavity for covering and wrapping the post filter element. The lower end of the raw water end lower outer shell extends circumferentially to form a top sleeve cover for covering the top part of the reverse osmosis membrane filter element of the reverse osmosis membrane filter element assembly and being hermetically connected by winding water-proof tape. The waste water end outer shell and the raw water end lower outer shell are sleeved and docked up and down to form an inner cavity for covering and wrapping the post upper end cover and the post lower end cover after docking and a waste water flow channel for facilitating the discharge of waste water.

[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 rotationally locked and installed on the outer wall of the top end of the cylinder body. A tap water inflow channel, a pure water outflow channel, and a waste water outflow channel are respectively provided on the top side pressure cover. The ultrasonic pressure cover is sleeved in the inner cavity of the locking cover and sealed by the top side pressure cover.

[0018] Preferably, three sets of channel cut-off covers and self-locking springs are also installed at the top end of the cylinder body, which are respectively communicated with the tap water inflow channel, the pure water outflow channel, and the waste water outflow channel corresponding to the top side gland and control the self-locking closing and cut-off of their respective corresponding channels.

[0019] Preferably, the top side gland and the outer circumference of the locking cover are tightly connected by a plurality of screws.

[0020] Preferably, the post-filter element assembly includes a raw water end upper shell, a waste water end shell, a post-filter element, a post-lower end cover, and a raw water end lower shell. The waste water end shell and the post-lower end cover are sleeved and docked up and down to form a cavity for sealing and wrapping the post-filter element. The lower end of the raw water end lower shell extends circumferentially to form a top sleeve cover for sealing the top end of the reverse osmosis membrane filter element on the reverse osmosis membrane filter element assembly and is hermetically connected by winding water-proof tape. The raw water end upper shell and the raw water end lower shell are sleeved and docked up and down to form a cavity for sealing and wrapping the docked waste water end shell and the post-lower end cover and a waste water flow channel for facilitating the discharge of waste water.

[0021] Preferably, the composite filter element assembly includes a composite upper socket, a cylindrical composite filter element, and a composite lower socket. The composite filter element is annularly sleeved on the outer circumference of the reverse osmosis membrane filter element on the reverse osmosis membrane filter element assembly. The top side of the composite upper socket abuts against the circumferential bottom side of the raw water end upper shell, and a plurality of raw water inlets are circumferentially recessed on the top side of the composite upper socket for facilitating the entry of tap water in the raw water channel on the outer wall side of the raw water end upper shell into the inner wall side of the composite filter element.

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

[0023] A support cylinder is also arranged in the cylinder body below the composite lower socket, which is sleeved on the outer periphery of the reverse osmosis membrane filter element on the reverse osmosis membrane filter element assembly and has a lower end abutting against the inner side surface of the filter element handle seat for supporting the entire composite filter element assembly. A plurality of composite filter water inlets are circumferentially recessed on the top end surface or / and the bottom end surface of the support cylinder for facilitating the entry of the filtered water led out from the outer wall of the composite filter element.

[0024] A composite filter water inlet 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 for facilitating the introduction of the composite filter water of the composite filter element from the bottom end 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. A central channel that penetrates vertically is formed along the central axis of the reverse osmosis membrane filter element. At the center of the bottom end of the lower side of the post-filter element assembly, a post-introduction joint for introducing pure water extends and is inserted into the central channel at the top of the reverse osmosis membrane filter element.

[0026] The beneficial effects of the present invention are as follows:

[0027] In the top pressure cover assembly, there are three groups of tap water inflow channels, pure water outflow channels, and wastewater outflow channels. After the post-filter element assembly and the reverse osmosis membrane filter element assembly are docked, an annular raw water channel for external tap water to enter is formed between the inner wall of the cylinder. External tap water enters from the bottom of the composite filter element assembly through the raw water channel, flows out from the upper side after filtration, or external tap water enters from the inner wall of the composite filter element assembly through the raw water channel and then discharges from the outer wall side. Then, the discharged composite filtered water enters from the bottom of the reverse osmosis membrane filter element assembly. The pure water formed after being filtered by the reverse osmosis membrane filter element assembly flows out from the central channel of the reverse osmosis membrane filter element. Then, it directly enters the post-filter element from the bottom side, and after being filtered by the post-filter element, it flows out from the pure water outflow channel on the top pressure cover assembly, while the wastewater is directly discharged through the wastewater outflow channel.

[0028] The entire filter element device adopts a series arrangement or a nested arrangement in which three filter element assemblies are connected in series vertically one above the other. The structure is simple, which is convenient for the assembly of the composite filter element, effectively improving the assembly efficiency and reducing the volume of the filter element.

Description of the Drawings

[0029] Figure 1 is the exploded structural schematic diagram of the first embodiment of the present invention;

[0030] Figure 2 is the front sectional structural schematic diagram of the first embodiment of the present invention;

[0031] Figure 3 is the side sectional structural schematic diagram of the first embodiment of the present invention;

[0032] Figure 4 is the top-down three-dimensional structural schematic diagram of the first embodiment of the present invention;

[0033] Figure 5 is the bottom-up three-dimensional structural schematic diagram of the first embodiment of the present invention;

[0034] Figure 6 is the exploded structural schematic diagram of the second embodiment of the present invention;

[0035] Figure 7 is the front sectional structural schematic diagram of the second embodiment of the present invention after removing the top pressure cover assembly;

[0036] Figure 8It is a front-view three-dimensional sectional structure schematic diagram after removing the top pressure cover assembly in the second embodiment of the present invention;

[0037] Figure 9 It is a side-view three-dimensional sectional structure schematic diagram after removing the top pressure cover assembly in the second embodiment of the present invention;

[0038] Figure 10 It is a top-view three-dimensional structure schematic diagram after removing the top pressure cover assembly in the second embodiment of the present invention;

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

Specific Embodiment

[0040] Embodiment 1

[0041] A filter element device for water purification, which is applied to a water purifier. As Figures 1 to 5 shown, it includes a top pressure cover assembly 1, a cylinder 2 and a filter element handle seat 3. The top pressure cover assembly 1 is connected to the upper end of the cylinder 2 by a threaded snap cover. The filter element handle seat 3 is rotationally welded to the lower end of the cylinder 2. The top pressure cover assembly 1 is provided with a tap water inflow channel, a pure water outflow channel and a waste water outflow channel that communicate with the outside. A post-filter element assembly 6 with its top side communicating with the inside of the top pressure cover assembly 1 is sleeved on the top of the cylinder 2. A reverse osmosis membrane filter element assembly 7 with its top side abutting and communicating with the lower side of the post-filter element assembly 6 is sleeved in the middle of the cylinder 2. A composite filter element assembly 8 with its top side abutting and communicating with the lower side of the reverse osmosis membrane filter element assembly 7 and its bottom side sealed by the filter element handle seat 3 is sleeved at the bottom of the cylinder 2. Among them, after the post-filter element assembly 6, the reverse osmosis membrane filter element assembly 7 and the composite filter element assembly 8 are butted, an annular raw water channel 9 for external tap water to enter is formed between them and the inner wall of the cylinder 2. 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 after filtration, 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 directly enters the post-filter element assembly 6 from the bottom 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] As Figures 1 to 3As shown in the figure, the top pressing cover assembly 1 includes a top side pressing cover 1a, an ultrasonic pressing cover 1b, and a locking cover 1c. The locking cover 1c is rotatably and lockingly installed on the outer wall of the top end of the cylinder body 2. The top side pressing cover 1a is respectively provided with a tap water inflow channel, a pure water outflow channel, and a wastewater outflow channel. At the top end of the cylinder body 2, three groups of channel cutoff covers 4 and self-locking springs 5 are also installed, which are respectively connected to the corresponding tap water inflow channel, pure water outflow channel, and wastewater outflow channel of the top side pressing cover 1a and control the self-locking closing and cutoff of their respective corresponding channels. The ultrasonic pressing cover 1b and the three groups of channel cutoff covers 4 and self-locking springs 5 provided below it are sleeved in the inner cavity of the locking cover 1c and sealed by the top side pressing cover 1a. Between the circumferential outer edges of the top side pressing cover 1a and the locking cover 1c, they are tightly connected by a plurality of screws.

[0043] Continue as Figures 1 to 3 As shown in the figure, the composite filter element assembly 8 includes a composite lower end cover 80, a composite filter element 81, and a composite upper end cover 82. The composite filter element 81 is made of a carbon rod wrapped with non-woven fabric. The composite upper end cover 82 and the composite lower end cover 80 are butt-jointed and buckled up and down to form a receiving cavity for wrapping the composite filter element 81. The outer periphery on the upper side of the composite lower end cover 80 is also nested and butt-jointed with the circumferential outer periphery of the lower side of the reverse osmosis membrane lower end cover 71 provided at the lower end of the reverse osmosis membrane filter element assembly 7. Between the inner wall of the lower side of the composite upper end cover 82 and the outer wall of the upper part of the composite filter element 81, a composite filter water outlet channel 11 is formed, and the water passes through the bottom surface of the reverse osmosis membrane lower end cover 71 and enters from the bottom of the reverse osmosis membrane filter element.

[0044] Continue as Figures 1 to 3 As shown in the figure, the reverse osmosis membrane filter element assembly 7 includes a cylindrical reverse osmosis membrane filter element 70 and a reverse osmosis membrane lower end cover 71. A central channel 10 with a partition at the bottom is formed along the central axis of the reverse osmosis membrane filter element 70. At the center of the bottom end of the lower side of the post-filter element assembly 6, a post-insertion joint 72 is extended and inserted into the central channel 10 at the top of the reverse osmosis membrane filter element 70 for introducing pure water.

[0045] Continue as Figures 1 to 3 As shown in the figure, the post-filter element assembly 6 includes a wastewater end housing 60, a post-upper end cover 61, a post-filter element 62, a post-lower end cover 63, and a raw water end lower housing 64. The post-upper end cover 61 and the post-lower end cover 63 are sleeved and butt-jointed up and down to form an inner cavity for covering and wrapping the post-filter element 62. The lower end of the raw water end lower housing 64 extends circumferentially to form a top sleeve cover for covering the top end of the reverse osmosis membrane filter element 70 on the reverse osmosis membrane filter element assembly 7 and is hermetically connected by winding waterproof tape. Corresponding to this, the upper end of the reverse osmosis membrane lower end cover 7 extends circumferentially to form a bottom sleeve cover for covering the bottom end of the reverse osmosis membrane filter element 70 and is hermetically connected by winding waterproof tape. The wastewater end housing 60 and the raw water end lower housing 64 are sleeved and butt-jointed up and down to form an inner cavity for covering and wrapping the post-upper end cover 61 and the post-lower end cover 63 after docking and a wastewater flow channel for facilitating the discharge of wastewater.

[0046] In the first embodiment, when in use, the external tap water enters from the bottom of the composite filter element assembly 8 through the raw water channel and is filtered,

[0047] After the water flows out from the upper outer wall of the composite filter element 81 and passes through the composite water filtering outlet channel 11, it passes 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. The pure water formed after being filtered by the reverse osmosis membrane filter element assembly flows out from the central channel 10 of the reverse osmosis membrane filter element 70. Then, it 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 pressing cover assembly 1, and the wastewater is directly discharged through the wastewater outlet channel.

[0048] The second embodiment

[0049] A filter element device for purifying water, as Figures 6 to 10 shown. The difference between this embodiment and the first embodiment is that the composite filter element assembly 8' is circumferentially sleeved around the periphery of 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'. A central channel 10' that penetrates up and down is formed along the central axis of the reverse osmosis membrane filter element 70', and the bottom end of the reverse osmosis membrane filter element 70' is directly in contact with the inner wall surface of the filter element handle seat 3.

[0050] As Figures 6 to 9 shown, the high post-filter element assembly 6' includes a raw water end upper housing 60', a wastewater end housing 61', a post-filter element 62', a post-lower end cover 63' and a raw water end lower housing 64'. The wastewater end housing 61' and the post-lower end cover 63' are sleeved and docked up and down to form an inner cavity for sealing and wrapping the post-filter element 62'. The lower end of the raw water end lower housing 64' extends circumferentially with a top sleeve cover for sealing and covering the top end of the reverse osmosis membrane filter element 70' on the reverse osmosis membrane filter element assembly 7' and is hermetically connected by winding waterproof tape. The raw water end upper housing 60' and the raw water end lower housing 64' are sleeved and docked up and down to form an inner cavity for sealing and wrapping the docked wastewater end housing 61' and post-lower end cover 63' and a wastewater flow channel for facilitating the discharge of wastewater.

[0051] As Figures 6 to 9As shown, the composite filter element assembly 8' comprises a composite upper sleeve seat 80', a cylindrical composite filter element 81' and a composite lower sleeve seat 82'. The composite filter element 81' is annularly sleeved on 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 a non-woven fabric wrapped around the inner annular antiscalant layer, which can remove scale and effectively intercept impurities and particles with larger particle sizes; the top side of the composite upper sleeve seat 80' is in contact with the circumferential bottom side of the raw water end upper shell 60', and the circumferential recess on the top side of the composite upper sleeve seat 80' is provided with a plurality of raw water inlets 12 for facilitating the entry of tap water in the raw water channel 9' on the outer wall side of the raw water end upper shell 60' into the inner wall side of the composite filter element 81'; the top end sleeve of the composite filter element 81' is installed on the composite upper At the bottom end of the sleeve 80', the bottom end of the composite filter element 81' is sleeved and installed on the composite lower sleeve seat 82'; a bracket tube 83' is also provided in the cylinder body 2 on the lower side of the composite lower sleeve seat 82', which is sleeved on the outer periphery of the reverse osmosis membrane filter element 70' on the reverse osmosis membrane filter element assembly 7' and the lower end of which is in contact with the inner side surface of the filter element handle seat 3 for supporting the entire composite filter element assembly 8'. The top end surface and the bottom end surface of the bracket tube are both recessed in the circumferential direction and are provided with a plurality of composite filtered water inlet ports 13 for facilitating the entry of filtered water derived from the outer wall of the composite filter element 81'; a composite filtered water inlet channel 13 is formed between the inner wall of the bracket tube 83' and the outer wall of the reverse osmosis membrane filter element 70' on the reverse osmosis membrane filter element assembly 7', which is convenient for the composite filtered water of the composite filter element 81' to be introduced from the bottom end of the reverse osmosis membrane filter element assembly 7'. A rear introduction connector 14 for introducing pure water is provided at the bottom center of the rear lower end cover 63' in the rear filter element assembly 6' and is inserted into the top center channel 10' of the reverse osmosis membrane filter element 70'.

[0052] In this embodiment, after the post-filter element assembly 6' and the reverse osmosis membrane filter element assembly 7' are docked, an annular raw water channel 9' for external tap water to enter is formed between the post-filter element assembly 6' and the inner wall of the cylinder 2; then, the tap water in the raw water channel 9' enters from the inner wall of the cylindrical composite filter element assembly 8', and then flows out from the outer wall of the composite filter element assembly 8'. After being filtered by the composite filter element assembly 8', it moves downward along the bottom inner wall of the cylinder 2 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 from the middle central channel 10', and flows out from the outlet on the top pressure cover assembly after being filtered by the post-filter element assembly 6'.

[0053] The above-described embodiments are only preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. Any obvious changes made according to the shape, structure and principle of the present invention, as well as other changes that do not deviate from the essence of the present invention, should be included in the protection scope of the present invention.

Claims

1. A filter element device for water purification, characterized in that , including a top pressure cover assembly, a cylinder and a filter element handle seat, wherein the top pressure cover assembly is threadedly connected to the upper end of the cylinder, and the filter element handle seat is spin-welded to the lower end of the cylinder; The top pressure cover assembly is provided with a water inlet and outlet channel communicating with the outside; The top of the cylinder is provided with a post-filter element assembly whose top side is connected to the interior of the top gland assembly; The middle part of the cylinder is provided with a reverse osmosis membrane filter element assembly, the top side of which is abutted and connected to the lower side of the post-filter element assembly; The inner wall of the cylinder is sleeved with a composite filter element assembly, the top side of which is in contact with the lower side of the reverse osmosis membrane filter element assembly and the bottom side is sealed by the filter element handle seat cover, or circumferentially sleeved on the periphery of the reverse osmosis membrane filter element assembly; Among them, after the post-filter element assembly, the reverse osmosis membrane filter element assembly and the composite filter element assembly are connected, an annular raw water channel for external tap water to enter is formed between the inner wall of the cylinder. External tap water enters from the inner wall or bottom of the composite filter element assembly through the raw water channel and is filtered, and then flows out from the outer wall or the upper side of the inner wall of the composite filter element assembly. After being filtered by the composite filter element assembly, it enters from the bottom of the reverse osmosis membrane filter element assembly. The pure water formed after being filtered by the reverse osmosis membrane filter element assembly directly enters the post-filter element assembly from the bottom side from the middle central channel, and flows out from the outlet on the top pressure cover assembly after being filtered by the post-filter element assembly.

2. A filter element device for water purification according to claim 1, characterized in that: The composite filter element assembly comprises a composite lower end cover, a cylindrical composite filter element and a composite upper end cover, wherein the composite upper end cover and the composite lower end cover are butt-jointed and buckled up and down to form a containing cavity enclosing the composite filter element.

3. A filter element device for water purification according to claim 2, characterized in that: The outer periphery of the upper side of the composite lower end cover is also nested and docked with the buckling portion extending from the circumferential periphery of the lower side of the reverse osmosis membrane lower end cover set at the lower end of the reverse osmosis membrane filter element assembly. The outer periphery of the upper side of the composite upper end cover is also formed with the inner wall of the lower side of the reverse osmosis membrane lower end cover to form a composite filtered water outlet channel for water to flow out from the upper outer wall of the composite filter element and pass through the bottom surface of the reverse osmosis membrane lower end cover to enter from the bottom of the reverse osmosis membrane filter element.

4. A filter element device for water purification according to claim 1, characterized in that: The reverse osmosis membrane filter element assembly comprises a cylindrical reverse osmosis membrane filter element and a reverse osmosis membrane lower end cover, the central axis of the reverse osmosis membrane filter element forms a central channel with a partition at the bottom, and the rear filter element assembly extends from the bottom center of the lower side to have a rear introduction joint inserted into the top central channel of the reverse osmosis membrane filter element for introducing pure water.

5. A filter element device for water purification according to claim 1, characterized in that: The post-filter element assembly comprises a wastewater end housing, a post-upper end cover, a post-filter element, a post-lower end cover and a raw water end lower housing; the post-upper end cover and the post-lower end cover are fitted and docked together to form an inner cavity that covers the post-filter element; the lower end of the raw water end lower housing is circumferentially extended with a top cover that is used to cover the top end of the reverse osmosis membrane filter element on the reverse osmosis membrane filter element assembly and is sealed and connected to each other by winding water tape; the wastewater end housing and the raw water end lower housing are fitted and docked together to form an inner cavity that covers the rear upper end cover and the rear lower end cover after the covers are docked and a wastewater flow channel that is convenient for wastewater discharge.

6. A filter element device for water purification according to claim 1, characterized in that: 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 end of the cylinder. The top side pressure cover is respectively provided with a tap water inlet channel, a pure water outflow channel, and a waste water outflow channel. The ultrasonic pressure cover is sleeved in the inner cavity of the locking cover and is sealed by the top side pressure cover.

7. A filter element device for water purification according to claim 6, characterized in that: The top end of the cylinder is also equipped with three sets of channel cut-off covers and self-locking tension springs which are connected to the tap water inlet channel, pure water outflow channel and waste water outflow channel corresponding to the top side pressure cover and control the self-locking closure and cut-off of the corresponding channels.

8. A filter element device for water purification according to claim 1, characterized in that: The post-filter element assembly comprises a raw water end upper shell, a waste water end shell, a post-filter element, a post-lower end cover and a raw water end lower shell; the waste water end shell and the post-lower end cover are fitted and docked up and down to form an inner cavity that covers the post-filter element; the lower end of the raw water end lower shell is circumferentially extended with a top cover that is used to cover the top end of the reverse osmosis membrane filter element on the reverse osmosis membrane filter element assembly and is sealed and connected to each other by winding water tape; the raw water end upper shell and the raw water end lower shell are fitted and docked up and down to form an inner cavity that covers the waste water end shell and the post-lower end cover after the sealing and docking, and a waste water flow channel that is convenient for waste water discharge.

9. A filter element device for water purification according to claim 8, characterized in that: The composite filter element assembly comprises a composite upper sleeve seat, a cylindrical composite filter element and a composite lower sleeve seat, the composite filter element is annularly sleeved on the circumferential periphery of the reverse osmosis membrane filter element on the reverse osmosis membrane filter element assembly, the top side of the composite upper sleeve seat abuts against and receives the circumferential bottom side of the raw water end upper shell, and the circumferential recess on the top side of the composite upper sleeve seat is provided with a plurality of raw water inlets for facilitating the tap water in the raw water channel on the outer wall side of the raw water end upper shell to enter the raw water inlet on the inner wall side of the composite filter element; The top end plug sleeve of the composite filter element is installed at the bottom end of the composite upper sleeve seat, and the bottom end plug sleeve of the composite filter element is installed on the composite lower sleeve seat; A support cylinder is also provided in the cylinder body at the lower side of the composite lower sleeve seat, which is sleeved on the outer periphery of the reverse osmosis membrane filter element on the reverse osmosis membrane filter element assembly, and the lower end of which abuts against the inner side surface of the filter element handle seat for supporting the entire composite filter element assembly. The top end surface or the bottom end surface of the support cylinder is circumferentially recessed and has multiple composite filtered water inlets for the filtered water derived from the outer wall of the composite filter element to enter; A composite filtered water inlet channel is formed between the inner wall of the support tube and the outer wall of the reverse osmosis membrane filter element on the reverse osmosis membrane filter element assembly, which facilitates the composite filtered water of the composite filter element to be introduced from the bottom end of the reverse osmosis membrane filter element assembly.

10. A filter element device for water purification according to claim 8, characterized in that: The reverse osmosis membrane filter element assembly comprises a cylindrical reverse osmosis membrane filter element, the central axis of the reverse osmosis membrane filter element forms a central channel that runs through from top to bottom, and a rear-placed introduction joint for introducing pure water is extended from the center of the lower bottom end of the rear-placed filter element assembly and is inserted into the central channel at the top end of the reverse osmosis membrane filter element.

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