Composite filter element and water purifier with same

Abstract

The utility model discloses a composite filter element and a water purifier with the composite filter element, the composite filter element comprises a filter element shell, a filter element cavity is formed in the filter element shell, and a first water inlet, a first water outlet, a second water inlet and a second water outlet are formed in the filter element shell; the first filtering module is arranged in the filter element cavity and is adjacent to the axial end of the filter element shell in the axial direction of the filter element shell, and the first water inlet, the first water outlet and the first filtering module are connected to form a first filtering water path; the second filtering module is arranged in the filter element cavity, the second filtering module is adjacent to the other axial end of the filter element shell, the second water inlet, the second water outlet and the second filtering module are connected to form a second filtering waterway, and the first water inlet and the first water outlet are communicated with the second filtering waterway. And the second water inlet and the second water outlet are positioned at the same axial end of the filter element shell. The composite filter element disclosed by the embodiment of the utility model has the advantages of compact structure, small occupied space and the like.

Description

Technical Field

[0001] This utility model relates to the field of water purification technology, and in particular to a composite filter element and a water purifier having the same. Background Technology

[0002] Water treatment devices such as water purifiers in related technologies include multiple staged filter cartridges. These cartridges not only take up a lot of space, but the water channels they create are also quite complex, resulting in a relatively small water flow rate during filtration. This causes significant inconvenience for users and fails to quickly meet their water needs. Utility Model Content

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. Therefore, one objective of the present invention is to provide a composite filter element that has advantages such as compact structure and small space occupation.

[0004] This utility model also proposes a water purifier with a composite filter element.

[0005] This utility model also proposes some specific embodiments, including a composite filter element, characterized in that it comprises: a filter element housing, wherein a filter element cavity is formed within the filter element housing, the filter element housing having a first inlet and a first outlet, as well as a second inlet and a second outlet; a first filtration module, wherein the first filtration module is disposed within the filter element cavity and is adjacent to one axial end of the filter element housing along the axial direction of the filter element housing, the first inlet and the first outlet being connected to the first filtration module to form a first filtration water path; and a second filtration module, wherein the second filtration module is disposed within the filter element cavity and is adjacent to the other axial end of the filter element housing, the second inlet and the second outlet being connected to the second filtration module to form a second filtration water path; wherein the first inlet and the first outlet, as well as the second inlet and the second outlet, are all located at the same end of the filter element housing along the axial direction, the first filtration module is located on the side away from the first inlet along the axial direction of the filter element housing, and the second filtration module is located on the side adjacent to the first inlet along the axial direction of the filter element housing.

[0006] The composite filter element according to the embodiments of this utility model has the advantages of compact structure and small space occupation.

[0007] According to some specific embodiments of the present invention, the filter element housing is constructed in a cylindrical shape, and the first water inlet and the first water outlet, as well as the second water inlet and the second water outlet, are all located at the same end of the filter element housing along its axial direction.

[0008] Furthermore, a central flow channel suitable for the passage of the first filtration water path is constructed at the radial center of the second filtration module, and the central flow channel extends axially through the second filtration module.

[0009] According to some specific embodiments of the present invention, the composite filter element further includes: a first central tube, which passes through the central flow channel and is connected to the first filter module; and a second central tube, which passes through the central flow channel and surrounds the outer periphery of the first central tube; wherein, the first filtration water path includes a first inlet water path and a first outlet water path, the first outlet water path is formed inside the first central tube, and the first inlet water path is formed between the first central tube and the second central tube.

[0010] According to some specific embodiments of the present invention, a sealing element is constructed at one end of the first central tube and the second central tube adjacent to the first water inlet, and the sealing element is located radially between the first central tube and the second central tube to form a seal.

[0011] According to some specific embodiments of the present invention, one end of the second central tube extends beyond the first central tube and forms a first slot adapted to the shape of the end of the first central tube, and the first central tube is inserted into the first slot; wherein, the sealing member is accommodated in the first slot and includes: a bottom sealing portion disposed between one axial end of the first central tube and the bottom wall of the first slot; and a side sealing portion connected to the bottom sealing portion, the side sealing portion being radially located between the first central tube and the second central tube to form a seal.

[0012] According to some specific embodiments of the present invention, the outer peripheral surface of the side sealing part is constructed with an annular protrusion, and the annular protrusion is interference-fitted with the inner peripheral surface of the first slot of the second central tube to form a seal.

[0013] According to some specific embodiments of the present invention, a boss is constructed at one end of the second central tube, and the filter housing is constructed with a second slot that matches the shape of the boss, and the boss is inserted into the second slot.

[0014] According to some specific embodiments of the present invention, the outer peripheral surface of the boss is provided with a first sealing ring, and the outer peripheral surface of the other end of the second central tube is provided with a second sealing ring. The first sealing ring is sealed between the outer peripheral surface of the boss and the inner peripheral surface of the second slot, and the second sealing ring is sealed between the outer peripheral surface of the second central tube and the inner peripheral surface of the first filter module.

[0015] Furthermore, the composite filter element further includes: a third central tube, which is disposed on the inner circumference of the second filter module to form the central flow channel, and the third central tube surrounds the outer circumference of the second central tube; wherein, the second filtration water path includes a second inlet water path and a second outlet water path, the second outlet water path is formed between the second central tube and the third central tube, and the second inlet water path is formed between the third central tube and the filter element housing.

[0016] Furthermore, the sidewall of the third central tube is provided with water flow holes, which connect the second filter module outside the third central tube and the interior of the third central tube.

[0017] According to some specific embodiments of the present invention, one end of the filter element housing is further provided with a wastewater outlet, and the second filtration water path further includes a wastewater outlet, which is connected to the second water inlet and the wastewater outlet.

[0018] According to some specific embodiments of the present invention, the first filtration module includes: a filter housing, the filter housing being installed at one axial end of the filter element housing, the filter housing being connected to the first water inlet channel, and the first central tube passing through the interior of the filter housing; and a carbon rod filter element, the carbon rod filter element being installed inside the filter housing, and the inner circumferential side of the carbon rod being connected to the first central tube.

[0019] According to some specific embodiments of the present invention, the second filtration module includes: a bracket, the bracket being installed at one end of the filter element housing axially away from the first filtration module; a reverse osmosis membrane, the reverse osmosis membrane being installed on the bracket, and the first central tube, the second central tube and the third central tube all passing through the radial center of the reverse osmosis membrane.

[0020] A water purifier is provided according to a second aspect of the present invention, comprising: the composite filter element described in the above-described embodiments of the present invention.

[0021] The water purifier according to the embodiments of the present invention, by using the composite filter element according to the above embodiments of the present invention, is conducive to the miniaturization of the equipment and has the advantages of compact structure and small space occupation.

[0022] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0023] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0024] Figure 1 This is a schematic diagram of the structure of the composite filter element according to an embodiment of the present utility model;

[0025] Figure 2 This is an exploded view of the composite filter element according to an embodiment of the present utility model;

[0026] Figure 3 This is a side view of the composite filter element according to an embodiment of the present utility model;

[0027] Figure 4 This is a partial schematic diagram of a composite filter element according to an embodiment of the present utility model;

[0028] Figure 5 This is a structural schematic diagram of the sealing element of the composite filter element according to an embodiment of the present utility model;

[0029] Figure 6 This is a schematic diagram of the structure of the second central tube of the composite filter element according to an embodiment of the present utility model;

[0030] Figure 7 This is a cross-sectional view of the interior of the composite filter element according to an embodiment of the present utility model;

[0031] Figure 8 This is a schematic diagram of water flow in the composite filter element according to an embodiment of the present invention;

[0032] Figure label:

[0033] Composite filter element 1, filter element housing 100, first inlet 101, first outlet 102, second inlet 103

[0034] Second outlet 104, first filter module 200, second filter module 300, central flow channel 30

[0035] First central tube 400, second central tube 500, third central tube 600, seal 700.

[0036] First filtration water path 10, first inlet water path 11, first outlet water path 12

[0037] Second filtration water path 20, second inlet water path 21, second outlet water path 22, wastewater discharge path 23.

[0038] Water flow hole 601, wastewater outlet 105, second slot 106, bottom sealing part 710, side sealing part 720

[0039] Annular protrusion 721, filter housing 210, carbon rod filter element 220, first slot 501, boss 502.

[0040] First sealing ring 503, second sealing ring 504, support 310, reverse osmosis membrane 320. Detailed Implementation

[0041] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0042] In the description of this utility model, "fine feature" and "coarse feature" may include one or more of the feature.

[0043] In the description of this utility model, "multiple" means two or more.

[0044] The composite filter element 1 according to an embodiment of the present invention is described below with reference to the accompanying drawings.

[0045] like Figures 1-8 As shown, the composite filter element 1 according to an embodiment of the present invention includes: a filter element housing 100, a second filter module 300, and a first filter module 200. A filter element cavity is formed within the filter element housing 100, and the filter element housing 100 has a first inlet 101, a first outlet 102, a second inlet 103, and a second outlet 104. The first filter module 200 is disposed within the filter element cavity and is adjacent to one axial end of the filter element housing 100 along its axial direction. The first inlet 101 and the first outlet 102 are connected to the first filter module 200 to form a first filtration water path 10. The second filter module 300 is disposed within the filter element cavity and is adjacent to the other axial end of the filter element housing 100. The second inlet 103 and the second outlet 104 are connected to the second filter module 300 to form a second filtration water path 20. The first inlet 101 and the first outlet 102, as well as the second inlet 103 and the second outlet 104, are all located at the same end of the filter housing 100 along the axial direction. The first filter module 200 is located on the side away from the first inlet 101 along the axial direction of the filter housing 100, and the second filter module 300 is located on the side adjacent to the first inlet 101 along the axial direction of the filter housing 100.

[0046] In addition, such as Figure 8 As shown, the first filtration water path 10 is represented by a dashed arrow, and the second filtration water path 20 is represented by a solid arrow.

[0047] For example, the first filtration module 200 uses filter media for filtration, and the second filtration module 300 uses an RO membrane for filtration. When the composite filter element 1 is used for filtration, water flows into the filter element housing 100 through the second inlet 103, first entering the first filtration module 200 for coarse filtration, and then flowing out from the second outlet 104. After coarse filtration, water flows back into the filter element housing 100 through the first inlet 101, enters the second filtration module 300 for fine filtration, and finally flows out from the first outlet 102. The water that flows out is clean, pure water. Here, the first filtration module 200 can be a first filtration module, and the second filtration module 300 can be a second filtration module.

[0048] According to the composite filter element 1 of this utility model embodiment, by arranging a first filtration module 200 and a second filtration module 300 within the filter element housing 100, and forming multiple inlet and outlet ports in the filter element housing 100, the water to be filtered sequentially forms a first filtration water path 10 and a second filtration water path 20 within a relatively small volume for filtration. The first filtration module 200 and the second filtration module 300 are concentrated within the same filter element housing 100, resulting in a smaller overall volume and a more compact arrangement of the composite filter element 1.

[0049] Furthermore, a first filtration water path 10, passing through the first filtration module 200, and a second filtration water path 20, passing through the second filtration module 300, are formed within the filter cartridge housing 100. These different water paths are located within the same filter cartridge housing 100, achieving a multi-path design within a single filter cartridge. The first filtration module 200 and the second filtration module 300 are arranged axially along the filter cartridge housing 100. The first filtration water path 10 and the second filtration water path 20 within the filter cartridge housing 100 are neatly arranged, resulting in smoother water flow. While maintaining the different filtration precision requirements of coarse and fine filtration, a high flow rate can also be maintained to quickly obtain pure water and meet the user's water needs.

[0050] Therefore, the composite filter element 1 according to the embodiment of this utility model forms a multi-channel filter element, which has the advantages of compact structure and small space occupation.

[0051] Specifically, the filter cartridge housing 100 includes a barrel and an end cap. A first inlet 101 and a first outlet 102, as well as a second inlet 103 and a second outlet 104, are all formed on the end cap. Thus, during filtration, the composite filter cartridge 1 receives and discharges water from the same side, and the inlet and outlet are arranged in a relatively concentrated manner.

[0052] Furthermore, such as Figure 7As shown, a central flow channel 30, suitable for the passage of the first filtration water path 10, is constructed at the radial center of the second filtration module 300. The central flow channel 30 extends axially through the second filtration module 300. Thus, the second filtration module 300 is constructed as a hollow columnar structure, with the central flow channel 30 providing a passage for the flow of the first filtration water path 10. During coarse filtration, the water to be filtered flows from the first inlet 101 through the central flow channel 30 to the first filtration module 200 for coarse filtration, and then flows out from the central flow channel 30 to the first outlet 102. The central flow channel 30 at the center of the second filtration module 300 provides the passage path for the first filtration water path 10 without occupying space outside the filter housing 100, resulting in a more rational spatial arrangement. The first filtration water path 10 occupies less space outside the second filtration module 300, resulting in a more compact structure.

[0053] In some specific embodiments of this utility model, such as Figure 7 As shown, the composite filter element 1 also includes a first central tube 400 and a second central tube 500. The first central tube 400 passes through the central flow channel 30 and communicates with the first filter module 200. The second central tube 500 passes through the central flow channel 30 and surrounds the outer periphery of the first central tube 400.

[0054] The first filtration water path 10 includes a first inlet water path 11 and a first outlet water path 12. The first outlet water path 12 is formed inside the first central pipe 400, and the first inlet water path 11 is formed between the first central pipe 400 and the second central pipe 500.

[0055] For example, one end of the first central tube 400 is installed with the filter housing 100, and the other end is installed with the first filter module 200. One end of the second central tube 500 is installed with the filter housing 100, and the other end is installed with the first filter module 200.

[0056] The first central pipe 400 forms the first water outlet path 12. The first central pipe 400 and the second central pipe 500 combine to form the first water outlet path 12. The first water inlet path 11 surrounds the outer periphery of the first water outlet path 12. After entering the first filtration module 200, the water flows radially towards the center of the first filtration module 200 for filtration, and finally flows to the first water outlet path 12 at the center of the first filtration module 200.

[0057] The first central pipe 400 and the second central pipe 500 are both formed within the central flow channel 30, thus the first water inlet channel 11 and the first water outlet channel 12 are also formed within the central flow channel 30, making full use of the space inside the second filter module 300 and achieving higher space utilization.

[0058] In some specific embodiments of this utility model, such as Figure 7As shown, a sealing element 700 is constructed at one end of the first central tube 400 and the second central tube 500 adjacent to the first water inlet 101. The sealing element 700 is radially located between the first central tube 400 and the second central tube 500 to form a seal. Due to the application of the sealing element 700, the ultrasonic welding process originally located inside the first central tube 400 can be eliminated, and the second central tube 500 is a one-piece injection molded structure, reducing additional assembly steps.

[0059] The seal 700 effectively prevents liquid leakage between the first central pipe 400 and the second central pipe 500, thereby ensuring normal fluid flow and filtration efficiency. Through the sealing and support of the seal 700, water flow is ensured to pass only through the specific filtration path of the composite filter element 1, preventing untreated water from entering the first filtration water path 10, thus improving filtration efficiency. Furthermore, the seal 700, located between the first central pipe 400 and the second central pipe 500, provides lateral support, helping to maintain the relative position between the first central pipe 400 and the second central pipe 500 and preventing displacement caused by pipe pressure.

[0060] In some specific embodiments of this utility model, such as Figure 4 and Figure 5 As shown, one end of the second central tube 500 extends beyond the first central tube 400 and forms a first slot 501 that matches the shape of the end of the first central tube 400. The first central tube 400 is inserted into the first slot 501. The seal 700 includes a bottom sealing portion 710 and a side sealing portion 720. The bottom sealing portion 710 is disposed between one axial end of the first central tube 400 and the bottom wall of the first slot 501. The side sealing portion 720 is connected to the bottom sealing portion 710 and is radially positioned between the first central tube 400 and the second central tube 500 to form a seal.

[0061] The bottom sealing part 710 is located between one axial end of the first central tube 400 and the bottom wall of the first slot 501. It can effectively prevent liquid from leaking along the contact surface of the first central tube 400 and the second central tube 500, ensuring the sealing of the overall structure of the composite filter element 1 and preventing the entry or exit of pollutants.

[0062] A side sealing portion is radially disposed between the first central tube 400 and the second central tube 500 along a 720° angle, forming an additional sealing layer to further prevent water leakage from the interior of the composite filter element 1 and improve the filtration effect of the composite filter element 1. Furthermore, by inserting the sealing element 700 into the first slot 501, the fixation and stability of the composite filter element 1 during use are enhanced, preventing displacement of the first central tube 400 and the second central tube 500 due to vibration or fluid impact, thereby maintaining the normal operating condition of the composite filter element 1.

[0063] In some specific embodiments of this utility model, such as Figure 5 As shown, the outer peripheral surface of the side sealing portion 720 is constructed with annular protrusions 721, which are interference-fitted with the inner peripheral surface of the first slot 501 of the second central tube 500 to form a seal. The annular protrusions 721 are spaced apart on the outer peripheral surface of the side sealing portion 720. Furthermore, there can be multiple annular protrusions 721, which are arranged axially to further improve the sealing performance.

[0064] The interference fit between the annular protrusion 721 and the inner circumferential surface effectively increases the contact area between the side sealing part 720 and the second central tube 500, thereby forming a stronger sealing effect and preventing liquid leakage from the connection. Through the interference fit, the annular protrusion 721 can also effectively block external impurities and contaminants from entering the first central tube 400, ensuring that only filtered liquid can enter the interior of the composite filter element 1, thereby improving the filtration effect and protecting the normal operation of the composite filter element 1.

[0065] In some specific embodiments of this utility model, such as Figure 6 As shown, a boss 502 is constructed at one end of the second central tube 500, and a second slot 106 is constructed in the filter housing 100 to match the shape of the boss 502. The boss 502 is inserted into the second slot 106. For example, a boss 502 structure is constructed on the side of the second central tube 500 adjacent to the first outlet 101, and the boss 502 is configured as an annular shape.

[0066] The engagement of the boss 502 with the second slot 106 ensures accurate positioning of the composite filter element 1 during installation, preventing poor sealing or functional failure caused by misalignment between the filter element housing 100 and the second central tube 500, thereby improving the overall reliability of the composite filter element 1. By precisely inserting the boss 502 into the second slot 106, a relatively closed connection interface is formed, which helps reduce liquid leakage at the connection point and improves the overall sealing effect of the composite filter element 1.

[0067] In some specific embodiments of this utility model, such as Figure 6As shown, a second sealing ring 503 is formed on the outer peripheral surface of the boss 502, and a second sealing ring 504 is formed on the outer peripheral surface of the other end of the second central tube 500. The second sealing ring 503 seals between the outer peripheral surface of the boss 502 and the inner peripheral surface of the second slot 106, and the second sealing ring 504 seals between the outer peripheral surface of the second central tube 500 and the inner peripheral surface of the first filter module 200. The second sealing ring 503 seals between the second central tube 500 and the filter element housing 100, and the second sealing ring 504 seals between the second central tube 500 and the first filter module 200. The second sealing rings 503 and 504 can increase the sealing performance between the above structures, effectively prevent liquid leakage in the composite filter element 1, improve the overall sealing performance of the composite filter element 1, and ensure the normal operation and reliability of the composite filter element 1.

[0068] Furthermore, such as Figure 7 and Figure 8 As shown, the composite filter element 1 also includes a third central tube 600. The third central tube 600 is disposed on the inner peripheral side of the second filter module 300 to form a central flow channel 30, and the third central tube 600 surrounds the outer peripheral side of the second central tube 500.

[0069] The second filtration water path 20 includes a second inlet water path 21 and a second outlet water path 22. The second outlet water path 22 is formed between the second central pipe 500 and the third central pipe 600, and the second inlet water path 21 is formed between the third central pipe 600 and the filter element housing 100.

[0070] For example, one end of the third central tube 600 is installed with the filter housing 100, and the other end is installed with the first filter module 200. By interlocking the first central tube 400, the second central tube 500, and the third central tube 600, the second water outlet 22 and the second water inlet 21 form a ring-shaped water channel, making full use of the space of the central flow channel 30 in the center of the second filter module 300.

[0071] Furthermore, such as Figure 7 and Figure 8 As shown, the side wall of the third central tube 600 is constructed with a water flow hole 601, which connects the second filter module 300 outside the third central tube 600 and the interior of the third central tube 600.

[0072] After being filtered by the second filtration module 300, the purified water enters the third central pipe 600 through the water flow hole 601, while the wastewater remains outside the third central pipe 600 without passing through the water flow hole 601. After being filtered by the second filtration module 300, the water flows through the water flow hole 601 into the second water outlet 22, ultimately yielding filtered purified water.

[0073] In some specific embodiments of this utility model, such as Figure 3As shown, one end of the filter cartridge housing 100 is also provided with a wastewater outlet 105, such as... Figure 5 As shown, the second filtration water path 20 also includes a wastewater discharge path 23, which is connected to the second water inlet path 21 and to the wastewater discharge outlet 105.

[0074] The wastewater discharge path 23 is formed between the third central pipe 600 and the filter housing. Part of the water from the second inlet water path 21 is filtered by the second filter module 300 and flows into the third central pipe 600, while the remaining wastewater remains outside the third central pipe 600 and enters the wastewater discharge path 23. The wastewater discharge path 23 promptly discharges the filtered wastewater to maintain the cleanliness of subsequent filtration by the second filter module 300.

[0075] In some specific embodiments of this utility model, such as Figure 7 and Figure 8 As shown, the first filtration module 200 includes a filter housing 210 and a carbon rod filter element 220. The filter housing 210 is installed at one axial end of the filter element housing 100 and is connected to the first water inlet passage 11. The first central tube 400 passes through the interior of the filter housing 210. The carbon rod filter element 220 is installed inside the filter housing 210, and its inner circumferential side is connected to the first central tube 400.

[0076] For example, a carbon rod filter element 220 is arranged around a first central tube 400. The first central tube 400 extends to the side of the carbon rod filter element 220 away from the second filter module 300. Water from the first inlet water passage 11 first flows into the filter housing 210 and is filtered from the outer periphery of the carbon rod filter element 220 towards the center. The filtered water enters the first central tube 400 and is discharged from the first outlet water passage 12, completing the coarse filtration. The carbon rod filter element 220 relies on the porous structure of activated carbon to adsorb organic matter in the water and remove impurities such as odors and residual chlorine.

[0077] In some specific embodiments of this utility model, such as Figure 6 and Figure 7 As shown, the second filtration module 300 includes a support 310 and a reverse osmosis membrane 320 (RO membrane). The support 310 is installed at the end of the filter cartridge housing 100 axially away from the first filtration module 200. The reverse osmosis membrane 320 is installed on the support 310, and the first central tube 400, the second central tube 500, and the third central tube 600 all pass through the radial center of the reverse osmosis membrane 320.

[0078] The support 310 positions the reverse osmosis membrane 320 radially between the third central tube 600 and the filter cartridge housing 100. During filtration, water flows from the radially outer side to the radially central side of the second filtration module 300. It is understood that the reverse osmosis membrane 320 is a semi-permeable membrane with pore sizes as small as 0.0001, offering higher filtration precision than the carbon rod filter cartridge 220. It can remove most impurities from the water and further filter out substances such as inorganic salts and heavy metal ions that the carbon rod filter cartridge 220 cannot remove.

[0079] The following describes a water purifier according to an embodiment of the present invention.

[0080] The water purifier according to an embodiment of the present invention includes: a composite filter element 1 according to the above embodiment of the present invention.

[0081] The water purifier according to the embodiments of the present invention has the advantages of compact structure and small space occupation by using the composite filter element 1 according to the above embodiments of the present invention.

[0082] The composite filter element 1 and other components and operations of the water purifier according to the embodiments of this utility model are known to those skilled in the art and will not be described in detail here.

[0083] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0084] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A composite filter element, characterized in that, include: A filter cartridge housing, wherein a filter cartridge cavity is formed inside the filter cartridge housing, and the filter cartridge housing has a first water inlet and a first water outlet, as well as a second water inlet and a second water outlet; The first filtration module is disposed in the filter element cavity and is adjacent to one axial end of the filter element housing along the axial direction of the filter element housing. The first water inlet and the first water outlet are connected to the first filtration module to form a first filtration water path. The second filtration module is disposed in the filter element cavity and is located adjacent to the other axial end of the filter element housing. The second inlet and the second outlet are connected to the second filtration module to form a second filtration water path. The first inlet and the first outlet, as well as the second inlet and the second outlet, are all located at the same end of the filter housing along the axial direction. The first filter module is located on the side away from the first inlet along the axial direction of the filter housing, and the second filter module is located on the side adjacent to the first inlet along the axial direction of the filter housing.

2. The composite filter element according to claim 1, characterized in that, The second filter module has a central flow channel at its radial center, which is suitable for the passage of the first filter water path, and the central flow channel extends through the second filter module axially.

3. The composite filter element according to claim 2, characterized in that, Also includes: The first central tube passes through the central flow channel and is connected to the first filter module; The second central tube passes through the central flow channel and surrounds the outer periphery of the first central tube; The first filtration water path includes a first inlet water path and a first outlet water path. The first outlet water path is formed inside the first central pipe, and the first inlet water path is formed between the first central pipe and the second central pipe.

4. The composite filter element according to claim 3, characterized in that, The first central tube and the second central tube are provided with a seal at one end near the first inlet, the seal being located radially between the first central tube and the second central tube to form a seal.

5. The composite filter element according to claim 4, characterized in that, One end of the second central tube extends beyond the first central tube and forms a first slot that is adapted to the shape of the end of the first central tube, and the first central tube is inserted into the first slot. The seal is accommodated within the first slot and includes: A bottom sealing portion is disposed between one axial end of the first central tube and the bottom wall of the first slot; A side sealing portion is connected to the bottom sealing portion and is located radially between the first central tube and the second central tube to form a seal.

6. The composite filter element according to claim 5, characterized in that, The outer peripheral surface of the side sealing part is constructed with an annular protrusion, which is interference-fitted with the inner peripheral surface of the first slot of the second central tube to form a seal.

7. The composite filter element according to claim 3, characterized in that, One end of the second central tube is constructed with a boss, and the filter housing is constructed with a second slot that matches the shape of the boss, and the boss is inserted into the second slot.

8. The composite filter element according to claim 7, characterized in that, The outer peripheral surface of the boss is provided with a second sealing ring, and the outer peripheral surface of the other end of the second central tube is provided with a second sealing ring. The second sealing ring seals between the outer peripheral surface of the boss and the inner peripheral surface of the second slot, and between the outer peripheral surface of the second central tube and the inner peripheral surface of the first filter module.

9. The composite filter element according to claim 3, characterized in that, Also includes: The third central tube is disposed on the inner peripheral side of the second filter module to form the central flow channel, and the third central tube surrounds the outer peripheral side of the second central tube; The second filtration water path includes a second inlet water path and a second outlet water path. The second outlet water path is formed between the second central pipe and the third central pipe, and the second inlet water path is formed between the third central pipe and the filter element housing.

10. The composite filter element according to claim 9, characterized in that, The sidewall of the third central tube is provided with a water flow hole, which connects the second filter module outside the third central tube and the interior of the third central tube.

11. The composite filter element according to claim 9, characterized in that, One end of the filter element housing is also provided with a wastewater outlet, and the second filtration water path also includes a wastewater outlet, which is connected to the second water inlet and the wastewater outlet.

12. The composite filter element according to claim 3, characterized in that, The first filtering module includes: A filter housing is installed at one axial end of the filter element housing, the filter housing is connected to the first water inlet channel, and the first central tube passes through the interior of the filter housing; A carbon rod filter element is installed inside the filter housing, and the inner circumferential side of the carbon rod is connected to the first central tube.

13. The composite filter element according to claim 9, characterized in that, The second filtering module includes: A bracket is installed at the end of the filter housing that is axially away from the first filter module; A reverse osmosis membrane is mounted on the support, and the first central tube, the second central tube, and the third central tube are all inserted through the radial center of the reverse osmosis membrane.

14. A water purifier, characterized in that, include: The composite filter element according to any one of claims 1-13.

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