Composite filter element

Abstract

The present disclosure relates to a composite filter element, which comprises: a clean water inlet, a tap water inlet and outlet, a pure water outlet and a waste water outlet are arranged on the filter element housing; the first opening of the RO adapter sleeve is connected to the clean water inlet; the RO membrane element comprises an inlet side, a pure water side and a waste water side, and the second opening is connected to the inlet side; the waste water side is connected to the waste water outlet; the upper end of the RO membrane central tube is open and the lower end is closed, and the side wall is provided with a first pure water through hole, and the pure water on the pure water side enters the RO membrane central tube through the first pure water through hole; the water drive tank comprises a water drive tank housing and a water drive tank water bag located in the water drive tank housing, the water drive tank water bag is used to divide the space in the water drive tank housing into a tap water cavity and a pure water cavity, the tap water cavity is connected to the tap water inlet and outlet, and the pure water cavity is connected to the pure water outlet and the upper end opening of the RO membrane central tube; a pure water check valve is arranged in the pure water cavity of the RO membrane central tube or the water drive tank. The present technical solution can reduce the overall volume of the water purifier.

Description

Technical Field

[0001] The present disclosure relates to the technical field of water purification, and in particular to a composite filter element. Background Art

[0002] As people's living standards improve, they pay more and more attention to water quality and hygiene, and it has become a trend to equip families with water purifiers. If the water purifier is not used for a long time, the ions in front of the RO membrane in the RO (Reverse Osmosis) filter element in the water purifier will pass through the RO membrane and penetrate into the pure water end, resulting in a higher TDS (Total dissolved solids) in the first glass of water, affecting the user experience.

[0003] In order to solve the above problems, pure water bubble membrane technology can be used in the prior art to separately set a water tank and a water drive tank in the water purifier. However, the separate water tank and water drive tank will occupy the internal space of the water purifier, resulting in a large overall volume of the water purifier and affecting the installation of other home appliances in the sink cabinet. Summary of the invention

[0004] In order to overcome the problems existing in the related art, the embodiment of the present disclosure provides a composite filter element. The technical solution is as follows:

[0005] According to one aspect of an embodiment of the present disclosure, there is provided a composite filter element, comprising:

[0006] A filter cartridge housing, wherein the filter cartridge housing is provided with a clean water inlet, a tap water inlet and outlet, a pure water outlet and a waste water outlet;

[0007] A reverse osmosis (RO) adapter sleeve, located in the filter cartridge housing, is an annular bracket with openings at both ends, including a first opening located at the upper end of the RO adapter sleeve and a second opening located at the lower end of the RO adapter sleeve, wherein the first opening is connected to the purified water inlet;

[0008] The RO membrane element comprises a water inlet side, a pure water side and a wastewater side. The wastewater generated after the RO membrane element filters the purified water entering the water inlet side is located at the wastewater side, and the pure water generated is located at the pure water side. The second opening is connected to the water inlet side of the RO membrane element; the wastewater side is connected to the wastewater outlet through the cavity between the RO membrane element and the filter element housing and the cavity between the RO adapter sleeve and the filter element housing.

[0009] An RO membrane central tube, wherein the upper end of the RO membrane central tube is open and the lower end is closed, and a first pure water through hole is provided on the side wall of the RO membrane central tube. The RO membrane central tube is located on the pure water side of the RO membrane element, and pure water on the pure water side enters the RO membrane central tube through the first pure water through hole;

[0010] A water drive tank is located in the filter element housing, comprising a water drive tank housing and a water drive tank water bag located in the water drive tank housing, wherein the water drive tank water bag is used to divide the space in the water drive tank housing into a tap water chamber and a pure water chamber, wherein the tap water chamber is connected to the tap water inlet and outlet, and the pure water chamber is connected to the pure water outlet and the upper end opening of the RO membrane central tube; the water drive tank is used to store the pure water produced by the RO membrane element in the pure water chamber during water replenishment, and the tap water in the tap water chamber presses the pure water in the pure water chamber to be discharged from the pure water outlet during water drainage;

[0011] Wherein, a pure water check valve is arranged in the pure water cavity of the RO membrane central tube or the water drive tank, and the pure water check valve is used to limit the pure water to flow from the RO membrane central tube to the pure water cavity.

[0012] In one embodiment, the water drive tank shell is an annular shell with openings at both ends, including a third opening located at the upper end of the water drive tank shell and a fourth opening located at the lower end of the water drive tank, the fourth opening is connected to the upper end opening of the RO membrane central tube, and the third opening is connected to the pure water outlet;

[0013] One end of the water drive tank water bag is open, the cavity in the water drive tank water bag is a tap water cavity, the cavity between the water drive tank water bag and the water drive tank shell is a pure water cavity, and the tap water cavity is connected to the tap water inlet and outlet through the opening of the water drive tank water bag;

[0014] The pure water check valve is arranged at the fourth opening.

[0015] In one embodiment, the water drive tank shell is an annular shell with openings at both ends, including a third opening located at the upper end of the water drive tank shell and a fourth opening located at the lower end of the water drive tank;

[0016] The water drive tank water bag is an annular water bag with openings at both ends, the cavity in the water drive tank water bag is a pure water cavity, the cavity between the water drive tank water bag and the water drive tank shell is a tap water cavity, and the tap water cavity is connected to the tap water inlet and outlet through the third opening;

[0017] The water drive tank also includes a water drive tank center tube, which is located in the water bag of the water drive tank. The water drive tank center tube has upper and lower openings, the upper opening of the water drive tank center tube is connected to the pure water outlet, the lower opening of the water drive tank center tube is connected to the upper end opening of the RO membrane center tube, the water drive tank center tube passes through the upper and lower openings of the water bag of the water drive tank and the fourth opening, the pure water check valve is arranged at the bottom of the water drive tank center tube, and the side wall of the water drive tank center tube above the pure water check valve is provided with a second pure water through hole.

[0018] In one embodiment, it further includes: a post-filter element;

[0019] The post-filter element is located in the pure water flow area of ​​the composite filter element, and includes at least one of the following filter materials: activated carbon, PP cotton, origami PP, ultrafiltration membrane, microfiltration membrane, and mineralizer.

[0020] In one embodiment, the post-filter element is disposed in the RO membrane central tube.

[0021] In one embodiment, when the water drive tank includes a water drive tank center tube, the post filter element is disposed in the water drive tank center tube.

[0022] In one embodiment, the post-filter element is disposed in the central tube of the RO membrane and the central tube of the water drive tank.

[0023] In one embodiment, the composite filter element also includes a lower end cover of the RO membrane, which is located on the wastewater side of the RO membrane element. The lower end cover of the RO membrane is provided with a wastewater port, and a water-blocking component is provided at the wastewater port. The water-blocking component is used to prevent the backflow of wastewater; the water-blocking component includes a wastewater check valve or an elastic water-blocking component.

[0024] In one embodiment, the material of the water bag of the water drive tank includes elastic material or foldable non-elastic material.

[0025] In one embodiment, the clean water inlet, tap water inlet and outlet, pure water outlet and waste water outlet are all arranged on the top of the filter element housing.

[0026] In one embodiment, the composite filter element further comprises: a filter element rotation handle located at the bottom of the filter element housing.

[0027] The technical solution provided by the embodiments of the present disclosure may have the following beneficial effects:

[0028] In this embodiment, the water drive tank structure and the RO membrane filter element can be integrated together to form the above-mentioned composite filter element, thereby reducing the overall volume of the water purifier, solving the problem of increasing the volume of the water purifier when a separate water drive tank is set when there is a pure water bubble membrane and water demand, reducing the space occupied by the water purifier in the sink cabinet, and facilitating the installation of other household appliances in the sink cabinet.

[0029] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0031] Figure 1It is a schematic structural diagram of a composite filter element according to an exemplary embodiment.

[0032] Figure 2 It is a schematic structural diagram of a composite filter element according to an exemplary embodiment.

[0033] Figure 3 It is a schematic structural diagram of a composite filter element according to an exemplary embodiment.

[0034] Figure 4 It is a schematic structural diagram of a composite filter element according to an exemplary embodiment.

[0035] Figure 5 It is a schematic structural diagram of a composite filter element according to an exemplary embodiment. DETAILED DESCRIPTION

[0036] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0037] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0038] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] The present invention provides a composite filter element. Figure 1 FIG. 1 is a schematic diagram of the structure of a composite filter element according to an exemplary embodiment. Figure 1 As shown, the composite filter element includes: a filter element housing 11, a reverse osmosis RO adapter sleeve 12, a RO membrane element 13, a RO membrane central tube 14, a water drive tank housing 15, and a water drive tank water bag 16.

[0040] The filter housing 11 is provided with a clean water inlet 111, a tap water inlet and outlet 112, a pure water outlet 113 and a waste water outlet 114; the reverse osmosis RO adapter sleeve 12 is located in the filter housing 11, and is an annular bracket with openings at both ends. The RO adapter sleeve 12 includes a first opening 121 located at the upper end of the RO adapter sleeve and a second opening 122 located at the lower end of the RO adapter sleeve, and the first opening 121 is connected to the clean water inlet 111; the RO membrane element 13 includes an inlet side, a pure water side and a waste water side. The RO membrane element 13 filters the clean water entering the inlet side, and the waste water generated is located on the waste water side 131, and the generated pure water is located on the pure water side. The second opening is connected to the The water inlet side of the RO membrane element; the wastewater side is connected to the wastewater outlet 114 through the cavity between the RO membrane element 13 and the filter element housing 11 and the cavity between the RO adapter sleeve 12 and the filter element housing 11; the upper end of the RO membrane center tube 14 is open and the lower end is closed, and the side wall of the RO membrane center tube 14 is provided with a first pure water through hole 1311, the RO membrane center tube 14 is located on the pure water side of the RO membrane element 13, and the pure water on the pure water side enters the RO membrane center tube 14 through the first pure water through hole 1311; the water drive tank is located in the filter element housing 11, including a water drive tank housing 15 and a water drive tank water bag 16 located in the water drive tank housing 15, for example, Figure 1 As shown, the water drive tank is located in the RO adapter sleeve 12. Of course, in other embodiments, the water drive tank can also be located outside the RO adapter sleeve 12, which is not limited here. The water drive tank water bag 16 is used to divide the space in the water drive tank shell 15 into a tap water cavity and a pure water cavity. The water drive tank water bag 16 can divide the interior of the water drive tank shell 15 into a cavity in the water drive tank water bag 16 and a cavity outside the water drive tank water bag 16; here, the cavity in the water drive tank water bag 16 can be a tap water cavity, and the cavity between the water drive tank water bag 16 and the water drive tank shell 15 can be a pure water cavity, or the cavity in the water drive tank water bag 16 can be a pure water cavity, and the cavity between the water drive tank water bag 16 and the water drive tank shell 15 can be a tap water cavity, which is not limited here. The tap water cavity is connected to the tap water inlet and outlet, and the pure water cavity is connected to the pure water outlet and the upper end opening of the RO membrane central tube; the water drive tank is used to store the pure water produced by the RO membrane element in the pure water cavity during water replenishment, and the tap water in the tap water cavity presses the pure water in the pure water cavity to be discharged from the pure water outlet during water discharge; wherein, a pure water check valve is arranged in the pure water cavity of the RO membrane central tube or the water drive tank, for example, Figure 1 As shown, a pure water check valve 171 is arranged in the pure water chamber of the water drive tank, and the pure water check valve 171 is used to limit the pure water to flow from the RO membrane central tube 14 to the pure water chamber.

[0041] Here, the composite filter element with RO membrane is usually arranged after the pre-filter element, so as to avoid impurities in the water from damaging the composite filter element and other devices, thereby effectively improving the service life of the composite filter element. When the composite filter element with RO membrane is working, a booster pump needs to be set to provide power for the purified water. The purified water after the booster pump can be Figure 1 The clean water inlet 111 shown enters the composite filter element. Figure 1 As shown, the clean water entering the composite filter element can be introduced into the RO membrane element 13 through the RO membrane adapter sleeve, and filtered through the RO membrane. Under a certain pressure, water molecules can pass through the RO membrane, while inorganic salts, heavy metal ions, organic matter, colloids, bacteria, viruses and other impurities in the clean water cannot pass through the RO membrane, so that the pure water that can pass through the RO membrane and the concentrated water that cannot pass through the RO membrane are strictly distinguished. The two sides of the RO membrane can be divided into a pure water side and a wastewater side. The concentrated water cannot pass through the RO membrane and can only be discharged from the wastewater side of the RO membrane element 13, and then flow through the cavity between the RO membrane element 13, the RO adapter sleeve 12 and the filter element housing 11 and be discharged from the wastewater outlet 114 of the composite filter element. Pure water can pass through the RO membrane to the pure water side, and then enter the RO membrane central tube 14 from the first pure water through hole 141 on the RO membrane central tube 14, and then enter the pure water cavity in the water drive tank from the RO membrane central tube 14 for storage.

[0042] Here, a pure water check valve can be provided in the pure water chamber of the RO membrane central tube or the water drive tank, as shown in FIG. Figure 1 As shown, a pure water check valve 171 is provided at the lower opening of the water drive tank shell. The pure water check valve 171 is located in the pure water cavity of the water drive tank and is used to prevent the pure water in the pure water cavity of the water drive tank from flowing back to the RO membrane center tube so that the pure water cavity can store water. The tap water cavity in the water drive tank is used to accommodate tap water, and the tap water enters and exits the tap water cavity of the water drive tank from the tap water inlet and outlet. When the water drive tank needs to store pure water, the pure water in the pure water cavity squeezes the tap water in the tap water cavity, and the tap water in the tap water cavity is discharged from the water drive tank until the pure water cavity is filled with pure water; when the pure water cavity is discharging pure water, the tap water enters the tap water cavity of the water drive tank, squeezes the pure water in the pure water cavity, and makes it flow out from the pure water outlet 113.

[0043] In this embodiment, the water drive tank structure and the RO membrane filter element can be integrated together to form the above-mentioned composite filter element, thereby reducing the overall volume of the water purifier, solving the problem of increasing the volume of the water purifier when a separate water drive tank is set when there is a pure water bubble membrane and water demand, reducing the space occupied by the water purifier in the sink cabinet, and facilitating the installation of other household appliances in the sink cabinet.

[0044] In a possible embodiment, Figure 1As shown, the water drive tank shell 15 is an annular shell with openings at both ends, including a third opening located at the upper end of the water drive tank shell and a fourth opening located at the lower end of the water drive tank, the fourth opening is connected to the upper end opening of the RO membrane central tube, and the third opening is connected to the pure water outlet; the water drive tank water bag 16 is open at one end, the cavity in the water drive tank water bag 16 is a tap water cavity, the cavity between the water drive tank water bag 16 and the water drive tank shell 15 is a pure water cavity, the tap water cavity is connected to the tap water inlet and outlet through the opening of the water drive tank water bag 16, and the pure water check valve 171 is arranged at the fourth opening.

[0045] At this time, after the pure water produced by the RO membrane element 13 enters the RO membrane central tube 14, it can enter the pure water cavity between the water drive tank shell 15 and the water drive tank water bag 16 through the fourth opening from the RO membrane central tube 14 for storage. When the water drive tank stores pure water, the pure water in the pure water cavity squeezes the tap water in the water drive tank water bag 16, and the tap water in the water drive tank water bag 16 is discharged until the pure water cavity is filled with pure water; when the pure water cavity is draining pure water, tap water enters the water drive tank water bag 16, and the water drive tank water bag 16 is opened to squeeze the pure water in the pure water cavity, so that the pure water flows out from the pure water outlet 113.

[0046] The water bag of the water drive tank provided in this embodiment only needs to be provided with one opening to connect to the pure water outlet, so the sealing connection in the structure is easier to achieve, and the product yield is high and the cost is low.

[0047] In one possible embodiment, Figure 2 FIG. 1 is a schematic diagram of the structure of a composite filter element according to an exemplary embodiment. Figure 2As shown, the water drive tank shell 15 is located in the RO adapter sleeve 12, including a third opening 151 located at the upper end of the water drive tank shell and a fourth opening 152 located at the lower end of the water drive tank, and the third opening 151 is connected to the tap water inlet and outlet 112; the water drive tank water bag 16 is located in the water drive tank shell 15, and the upper and lower openings of the water drive tank water bag 16 are annular water bags with openings at both ends. At this time, the cavity in the water drive tank water bag 16 is a pure water cavity, and the cavity between the water drive tank water bag 16 and the water drive tank shell 15 is a tap water cavity, and the tap water cavity is connected to the tap water inlet and outlet 112 through the third opening. 12; The water drive tank also includes a water drive tank center tube 17, which is located in the water drive tank water bag 16, and the water drive tank center tube 17 has upper and lower openings. The upper opening of the water drive tank center tube 17 is connected to the pure water outlet 113, and the lower opening of the water drive tank center tube 17 is connected to the upper end opening of the RO membrane center tube 14. The water drive tank center tube 17 passes through the upper and lower openings of the water drive tank water bag and the fourth opening 152. A pure water check valve 171 is provided at the bottom of the water drive tank center tube 17, and a second pure water through hole 172 is provided on the side wall of the water drive tank center tube 17 above the pure water check valve 171.

[0048] At this time, after the pure water produced by the RO membrane element 13 enters the RO membrane central tube 14, it can enter the water drive tank central tube 17 from the RO membrane central tube 14, and enter the pure water cavity in the water bag 16 of the water drive tank from the second pure water through hole 172 on the water drive tank central tube for storage. When the water drive tank stores pure water, the pure water in the water bag 16 of the water drive tank squeezes the tap water in the tap water cavity, and the tap water in the tap water cavity is discharged until the water bag 16 of the water drive tank is filled with pure water; when the pure water cavity in the water bag 16 of the water drive tank is drained of pure water, tap water enters the tap water cavity, squeezes the water bag 16 of the water drive tank, and the pure water in its pure water cavity flows out from the pure water outlet 113.

[0049] In a possible embodiment, it further includes: a post-filter element; the post-filter element is located in the pure water flow area of ​​the composite filter element. The post-filter element includes but is not limited to at least one of the following filter materials: activated carbon, PP cotton, origami PP, ultrafiltration membrane, microfiltration membrane, mineralizer, etc., which is used to further filter the pure water flowing through, filter out particulate impurities in the water, and improve the taste of pure water, inhibit bacteria and antibacterial agents, and retain microorganisms.

[0050] Optionally, in a possible embodiment, Figure 3 FIG. 1 is a schematic diagram of the structure of a composite filter element according to an exemplary embodiment. Figure 3 As shown, the post filter element 18 is arranged in the RO membrane central tube 14. It should be noted here that Figure 3 is Figure 2The rear filter element 14 is arranged inside the RO membrane central tube 14 of the composite filter element shown in the figure. Figure 1 A post-filter element is arranged in the RO membrane central tube 14 of the composite filter element shown, which is not shown in the figure again.

[0051] like Figure 3 As shown, a post-filter element 18 is arranged in the RO membrane central tube 14. The pure water prepared by the RO membrane element 13 first flows into the RO membrane central tube 14 through the first pure water through hole 141, passes through the guide space formed by the gap between the RO membrane central tube 14 and the post-filter element 18, and then flows into the water bag 16 of the water drive tank after being processed by the post-filter element 18.

[0052] Or, optionally, in a possible embodiment, Figure 4 FIG. 1 is a schematic diagram of the structure of a composite filter element according to an exemplary embodiment. Figure 4 As shown, in Figure 2 When the water drive tank includes a water drive tank center tube 17 , the post filter element 18 may also be disposed in the water drive tank center tube 17 .

[0053] like Figure 4 As shown, a post-filter element 18 is arranged in the central tube of the water drive tank, and the pure water prepared by the RO membrane first flows from the RO membrane central tube 14 to the water drive tank central tube 17, and enters the water drive tank central tube 17 through the pure water check valve 171. The pure water in the water drive tank central tube 17 is processed by the post-filter element 18 and then stored in the water drive tank water bag 16 through the second pure water through hole 172. The pure water flowing out of the water drive tank central tube 17 will pass through the post-filter element 18, so that the taste of the pure water can be improved.

[0054] Or, optionally, in a possible embodiment, in the Figure 2 When the water drive tank includes a water drive tank central tube 17, the post filter element is arranged in the RO membrane central tube 14 and the water drive tank central tube 17. Figure 3 and Figure 4 A post-filter is provided in the RO membrane central tube 14 and the water drive tank central tube 17, and the details are not shown in the figure.

[0055] In one possible embodiment, Figure 5 FIG. 1 is a schematic diagram of the structure of a composite filter element according to an exemplary embodiment. Figure 2 and Figure 5As shown, the composite filter element also includes: an RO membrane lower end cover 19, which is located on the wastewater side of the RO membrane element 13, and a wastewater port 191 is provided on the RO membrane lower end cover 19, and a water blocking component 192 is provided at the wastewater port 191. The water blocking component 192 is used to prevent the wastewater from flowing back, so that the wastewater generated by the RO membrane can only flow out from the wastewater port but cannot flow back, and prevent the wastewater generated by the RO membrane element 13 from flowing back to the membrane of the RO membrane element 13 and passing through the RO membrane to penetrate into the pure water end. For example, the water blocking component 192 can be a wastewater check valve or other elastic water blocking components with the function of the check valve. The wastewater port 191 is connected to the wastewater outlet 114 through the cavity between the RO membrane element 13 and the filter element housing 11 and the cavity between the RO adapter sleeve 12 and the filter element housing 11.

[0056] In a possible embodiment, Figure 2 As shown, the clean water inlet 111, the tap water inlet and outlet 112, the pure water outlet 113 and the waste water outlet 114 are all provided with check valves 110. These check valves 110 are used to stop water from the filter element. In this way, when the composite filter element needs to be cleaned or replaced and the composite filter element is taken out of the water purifier, the valves of the check valves are all closed to prevent the water in the composite filter element from flowing out.

[0057] In a possible embodiment, the material of the water drive tank water bag 16 is an elastic material or a foldable non-elastic material, so that it is convenient to enter and exit water under the pressure of tap water or pure water. The elastic material can be elastic materials such as rubber, silica gel, or other elastic polymer materials. Further, the water stored in the water drive tank water bag 16 is not only used for soaking in the concentrated water side of the RO membrane, but also for drinking, so it can be made of food-grade elastic materials. The non-elastic material can be a foldable material such as PE (polyethylene).

[0058] In a possible embodiment, Figures 1 to 4 As shown, the clean water inlet 111, the tap water inlet and outlet 112, the pure water outlet 113 and the waste water outlet 114 are all arranged on the top of the filter element housing 11, so as to facilitate the installation or removal of the composite filter element in the water purifier.

[0059] In a possible embodiment, Figure 2 As shown, the composite filter element further includes a filter element rotating handle 115, and the filter element rotating handle 115 is located at the bottom of the filter element housing 11. The user can grasp the filter element rotating handle 115 to install or remove the composite filter element, which is convenient for the user to install or remove the composite filter element.

[0060] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the disclosure disclosed herein. This application is intended to cover any variations, uses or adaptations of the present disclosure, which follow the general principles of the present disclosure and include common knowledge or customary technical means in the art that are not disclosed in the present disclosure.

[0061] It should be understood that the present disclosure is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure should be limited by the appended claims.

Claims

1. A composite filter element, characterized in that: include: A filter cartridge housing, wherein the filter cartridge housing is provided with a clean water inlet, a tap water inlet and outlet, a pure water outlet and a waste water outlet; The RO adapter sleeve is located in the filter element housing and is an annular bracket with openings at both ends, including a first opening located at the upper end of the RO adapter sleeve and a second opening located at the lower end of the RO adapter sleeve, wherein the first opening is connected to the purified water inlet; The RO membrane element comprises a water inlet side, a pure water side and a wastewater side. The wastewater generated after the RO membrane element filters the purified water entering the water inlet side is located at the wastewater side, and the pure water generated is located at the pure water side. The second opening is connected to the water inlet side of the RO membrane element; the wastewater side is connected to the wastewater outlet through the cavity between the RO membrane element and the filter element housing and the cavity between the RO adapter sleeve and the filter element housing. An RO membrane central tube, wherein the upper end of the RO membrane central tube is open and the lower end is closed, and a first pure water through hole is provided on the side wall of the RO membrane central tube. The RO membrane central tube is located on the pure water side of the RO membrane element, and pure water on the pure water side enters the RO membrane central tube through the first pure water through hole; A water drive tank is located in the RO adapter sleeve, comprising a water drive tank shell and a water drive tank water bag located in the water drive tank shell, the water drive tank water bag is used to divide the space in the water drive tank shell into a tap water chamber and a pure water chamber, the tap water chamber is connected to the tap water inlet and outlet, and the pure water chamber is connected to the pure water outlet and the upper end opening of the RO membrane central tube; the water drive tank is used to store the pure water produced by the RO membrane element in the pure water chamber during water replenishment, and the tap water in the tap water chamber presses the pure water in the pure water chamber to be discharged from the pure water outlet during water drainage; Wherein, a pure water check valve is arranged in the pure water cavity of the RO membrane central tube or the water drive tank, and the pure water check valve is used to limit the pure water to flow from the RO membrane central tube to the pure water cavity.

2. The composite filter element according to claim 1, characterized in that: The water drive tank shell is an annular shell with openings at both ends, including a third opening located at the upper end of the water drive tank shell and a fourth opening located at the lower end of the water drive tank, the fourth opening is connected to the upper end opening of the RO membrane central tube, and the third opening is connected to the pure water outlet; One end of the water drive tank water bag is open, the cavity in the water drive tank water bag is a tap water cavity, the cavity between the water drive tank water bag and the water drive tank shell is a pure water cavity, and the tap water cavity is connected to the tap water inlet and outlet through the opening of the water drive tank water bag; The pure water check valve is arranged at the fourth opening.

3. The composite filter element according to claim 1, characterized in that: The water drive tank shell is an annular shell with openings at both ends, including a third opening located at the upper end of the water drive tank shell and a fourth opening located at the lower end of the water drive tank; The water drive tank water bag is an annular water bag with openings at both ends, the cavity in the water drive tank water bag is a pure water cavity, the cavity between the water drive tank water bag and the water drive tank shell is a tap water cavity, and the tap water cavity is connected to the tap water inlet and outlet through the third opening; The water drive tank also includes a water drive tank center tube, which is located in the water bag of the water drive tank. The water drive tank center tube has upper and lower openings, the upper opening of the water drive tank center tube is connected to the pure water outlet, the lower opening of the water drive tank center tube is connected to the upper end opening of the RO membrane center tube, the water drive tank center tube passes through the upper and lower openings of the water bag of the water drive tank and the fourth opening, the pure water check valve is arranged at the bottom of the water drive tank center tube, and the side wall of the water drive tank center tube above the pure water check valve is provided with a second pure water through hole.

4. The composite filter element according to any one of claims 1 to 3, characterized in that: Also includes: Post filter; The post-filter element is located in the pure water flow area of ​​the composite filter element, and includes at least one of the following filter materials: activated carbon, PP cotton, origami PP, ultrafiltration membrane, microfiltration membrane, and mineralizer.

5. The composite filter element according to claim 4, characterized in that: The post filter element is arranged in the central tube of the RO membrane.

6. The composite filter element according to claim 4, characterized in that: When the water drive tank includes a water drive tank center tube, the post filter element is arranged in the water drive tank center tube.

7. The composite filter element according to claim 6, characterized in that: The post-filter element is arranged in the central tube of the RO membrane and the central tube of the water drive tank.

8. The composite filter element according to claim 1, characterized in that: Also includes: The RO membrane lower end cover is located on the wastewater side of the RO membrane element. The RO membrane lower end cover is provided with a wastewater port. A water blocking component is provided at the wastewater port. The water blocking component is used to prevent wastewater backflow. The water blocking component is a wastewater check valve or an elastic water blocking component.

9. The composite filter element according to claim 1, characterized in that: The material of the water bag of the water drive tank is elastic material or foldable non-elastic material.

10. The composite filter element according to claim 1, characterized in that: The clean water inlet, tap water inlet and outlet, pure water outlet and waste water outlet are all arranged on the top of the filter element housing.

11. The composite filter element according to claim 1, characterized in that: Also includes: The filter element rotating handle is located at the bottom of the filter element housing.

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