Filter element assembly and water purification equipment

Abstract

The utility model relates to the technical field of water purification, discloses a filter element subassembly and water purification equipment, including filter shell, composite filter element and waterway board, filter shell internal there is independent first filter chamber and second filter chamber, filter shell has first water inlet, first water outlet, second water inlet and second water outlet, first water inlet and first filter chamber are communicated, and second water inlet and second water outlet are communicated. The composite filter element comprises a first-stage filter element and a second-stage filter element, the first-stage filter element is installed in the first filter cavity, the second-stage filter element is installed in the second filter cavity, the waterway plate is arranged in the filter shell and provided with a first waterway, the filtering rear end of the first-stage filter element is communicated with the first water outlet through the first waterway, and the waterway plate is provided with a second waterway and a third waterway; the second water inlet is communicated with the filtering front end of the second-stage filter element through a second water path, and the filtering rear end of the second-stage filter element is communicated with the second water outlet through a third water path. The first-stage filter element and the second-stage filter element are connected with the water inlet and the water outlet of the filter shell through the waterway plate, so that a pipeline is omitted, and the filter element assembly is simplified in structure and smaller in size.

Description

Technical Field

[0001] The utility model relates to the technical field of water purification, in particular to a filter element assembly and a water purification device. Background Art

[0002] During the process of tap water transportation in the pipe network, it is inevitable to have pollution such as rust, sediment, organic matter and microorganisms. A water purifier with a purification function can play a good role in removing impurities from tap water. The filter element assembly of the water purifier usually includes a pre-filter element, a precision filter element and a post-treatment filter element. Among them, the pre-filter element is used to remove organic matter, colloid, heavy metals and sediment particles, etc. The precision filter element (RO filter element) has extremely high precision, such as a reverse osmosis membrane filter element, which is the core treatment filter element of the filter element assembly. The post-treatment filter element is used to remove trace elements, adjust the pH and drinking taste, etc.

[0003] Since the water purifier needs to include filter elements with the above-mentioned multiple purification functions, its overall structural volume is relatively large, resulting in limited installation of the water purifier in narrow use environments such as kitchens. Summary of the Utility Model

[0004] In view of this, the utility model provides a filter element assembly and a water purification device to solve the problem that the existing water purifier is limited in installation in narrow use environments such as kitchens due to its relatively large overall structural volume.

[0005] The first aspect of the utility model provides a filter element assembly, which includes a filter housing, a composite filter element and a water circuit board. The interior of the filter housing has mutually independent first and second filter cavities. The filter housing has a first water inlet, a first water outlet, a second water inlet and a second water outlet. The first water inlet is communicated with the first filter cavity. The composite filter element includes a primary filter element and a secondary filter element. The primary filter element is installed in the first filter cavity and is used for primary filtration of raw water. The secondary filter element is installed in the second filter cavity and is used for secondary filtration of pure water. The water circuit board is arranged in the filter housing. The water circuit board has a first water circuit. The filtered rear end of the primary filter element is communicated with the first water outlet through the first water circuit. Raw water flows into the first filter cavity from the first water inlet, and after being filtered by the primary filter element, it flows into the first water circuit from the filtered rear end of the primary filter element and flows through the first water circuit to the first water outlet. The water circuit board has a second water circuit and a third water circuit. The second water inlet is communicated with the filtered front end of the secondary filter element through the second water circuit. The filtered rear end of the secondary filter element is communicated with the second water outlet through the third water circuit. Pure water flows through the second water circuit after flowing through the second water inlet and then flows into the filtered front end of the secondary filter element, and after being filtered by the secondary filter element, it flows into the third water circuit from the filtered rear end of the secondary filter element and flows through the third water circuit to the second water outlet.

[0006] Beneficial effects: When the filter element assembly of the present application is filtering, raw water flows into the first filter chamber from the first water inlet, and after being filtered by the primary filter element, it flows into the first water path from the filtered rear end of the primary filter element and flows through the first water path to the first water outlet. Pure water from the outside flows through the second water path after passing through the second water inlet, then flows into the front end of the secondary filter element, and after being filtered by the secondary filter element, it flows into the third water path from the filtered rear end of the secondary filter element and flows through the third water path to the second water outlet. Therefore, in the present application, the primary filter element and the secondary filter element are integrally arranged in the filter housing. The primary filter element can achieve primary filtration of raw water, and the secondary filter element can achieve re-filtration of pure water to ensure water quality. Moreover, a water path plate is provided to connect the primary filter element and the secondary filter element to the water inlets and outlets on the filter housing, eliminating the pipeline arrangement inside the filter element assembly, simplifying the overall structure of the filter element assembly and making it smaller in volume, which is more suitable for installation in narrow spaces.

[0007] In some embodiments, the filter element assembly further includes a partition portion disposed in the filter housing. The partition portion is sealingly connected to the water path plate. A first filter chamber is formed between the outer wall of the partition portion and the inner wall of the filter housing, and a second filter chamber is formed in the inner cavity of the partition portion.

[0008] Beneficial effects: The partition portion can divide the inner cavity of the filter housing to form a first filter chamber between the outer wall of the partition portion and the inner wall of the filter housing, and a second filter chamber is formed in the inner cavity of the partition portion, which is convenient for the installation of the primary filter element and the secondary filter element.

[0009] In some embodiments, the primary filter element is sleeved on the outer periphery of the partition portion and there is a first gap between the two. The first gap forms the filtered rear end of the primary filter element.

[0010] Beneficial effects: The partition portion realizes the installation and fixation of the primary filter element, and a first gap is formed between the inner wall of the primary filter element and the outer wall of the partition portion. The raw water in the first filter chamber can enter the first gap after being filtered by the primary filter element and then flow to the first water path of the water path plate.

[0011] In some embodiments, the secondary filter element is disposed inside the partition portion and there is a second gap between the two. The second gap forms the filtered front end of the secondary filter element, and the central flow channel of the secondary filter element forms the filtered rear end of the secondary filter element.

[0012] Beneficial effects: The partition portion realizes the outer peripheral installation limit of the secondary filter element, and a second gap is formed between the outer wall of the secondary filter element and the inner wall of the partition portion. The pure water from the second water path can flow into the second gap, be filtered by the secondary filter element, then flow into the central flow channel and flow to the third water path of the water path plate.

[0013] In some embodiments, a first installation position is provided on the surface of the water path plate facing the second filter chamber, and the end of the primary filter element is sealingly inserted into the first installation position.

[0014] Beneficial effects: The first installation position provided on the water circuit board facilitates the installation of the primary filter element, and the end of the primary filter element is hermetically inserted into the first installation position to seal the first gap, preventing the raw water filtered by the primary filter element from leaking back to the first filter chamber from the connection between the primary filter element and the first installation position.

[0015] In some embodiments, a second installation position is provided on the surface of the water circuit board facing the second filter chamber. The second installation position is located inside the first installation position, and the end of the partition part is hermetically inserted into the second installation position.

[0016] Beneficial effects: The second installation position provided on the water circuit board facilitates the installation of the partition part, and the end of the partition part is hermetically inserted into the second installation position to seal and separate the first gap and the second gap, preventing the raw water in the first gap from flowing into the second gap and also preventing the purified water in the second gap from flowing into the first gap, ensuring the independence of the filtration of the primary filter element and the secondary filter element.

[0017] In some embodiments, a third installation position is provided on the surface of the water circuit board facing the second filter chamber. The third installation position is located inside the second installation position, and the end of the secondary filter element is hermetically inserted into the third installation position.

[0018] Beneficial effects: The third installation position provided on the water circuit board facilitates the installation of the secondary filter element, and the end of the secondary filter element is hermetically inserted into the third installation position to seal and separate the second gap and the central flow channel, preventing the purified water in the second gap from flowing into the central flow channel and also preventing the purified water filtered by the secondary filter element from flowing into the second gap from the central flow channel, ensuring the sealed separation between the second gap and the central flow channel.

[0019] In some embodiments, a first sealing member is provided between the outer wall of the primary filter element and the inner wall of the first installation position.

[0020] Beneficial effects: The first sealing member seals between the outer wall of the primary filter element and the inner wall of the first installation position, ensuring the sealing reliability.

[0021] In some embodiments, a second sealing member is provided between the outer wall of the partition part and the inner wall of the second installation position.

[0022] Beneficial effects: The second sealing member seals between the outer wall of the partition part and the inner wall of the second installation position, ensuring the sealing reliability.

[0023] In some embodiments, a third sealing member is provided between the outer wall of the secondary filter element and the inner wall of the third installation position.

[0024] Beneficial effects: The third seal realizes the seal between the outer wall of the secondary filter element and the inner wall of the third installation position, ensuring the sealing reliability.

[0025] In some embodiments, a plurality of support portions are annularly arranged on the outer periphery of the partition portion, and the plurality of support portions are in contact with the inner wall of the filter housing.

[0026] Beneficial effects: The plurality of support portions provided can support the periphery of the partition portion, ensuring the installation stability of the partition portion in the filter housing.

[0027] In some embodiments, the primary filter element includes a first filter medium, a first upper end cap, and a first lower end cap. The first filter medium is sleeved on the outer periphery of the partition portion. The first upper end cap is connected to one end of the top of the first filter medium. The first upper end cap is sealingly inserted into the first installation position. The first lower end cap is connected to one end of the bottom of the first filter medium. The first lower end cap is in sealing cooperation with the outer wall of the partition portion.

[0028] Beneficial effects: The first upper end cap and the first lower end cap respectively support the top and bottom of the first filter medium, and facilitate the installation and connection of the first filter medium. Through the sealing cooperation between the first upper end cap and the first installation position, and the sealing cooperation between the first lower end cap and the partition portion, a sealed first gap can be formed.

[0029] In some embodiments, the secondary filter element includes a second filter medium, a second upper end cap, and a second lower end cap. The second filter medium is disposed in the inner cavity of the partition portion. The middle of the second filter medium has a central flow channel. The second upper end cap is connected to one end of the top of the second filter medium. The second upper end cap is sealingly inserted into the third installation position. The second lower end cap is connected to one end of the bottom of the second filter medium. The second lower end cap is in sealing cooperation with the inner wall of the partition portion, and the second lower end cap abuts and supports the bottom of the filter housing.

[0030] Beneficial effects: The second upper end cap and the second lower end cap respectively support the top and bottom of the second filter medium, and facilitate the installation and connection of the second filter medium. Through the sealing cooperation between the second upper end cap and the third installation position, and the sealing cooperation between the second lower end cap and the partition portion, the sealing separation of the second gap and the middle flow channel can be realized, ensuring the independent sealing performance of each.

[0031] In some embodiments, the second filter medium includes a first sub-filter medium and a second sub-filter medium. The first sub-filter medium is connected to the second upper end cap, and the second sub-filter medium is connected to the second lower end cap. The central flow channel is opened at the center of the second sub-filter medium. The first sub-filter medium is communicated with the central flow channel. Pure water passes through the second sub-filter medium for filtration and enters the central flow channel, and then flows through the first sub-filter medium for filtration and then flows into the third waterway. The secondary filter element further includes a third end cap, and the first sub-filter medium and the second sub-filter medium are connected through the third end cap.

[0032] Advantageous effects: The second filter medium is arranged in the form of a first sub-filter medium and a second sub-filter medium. The second upper end cap and the third end cap realize the installation and support of the first sub-filter medium, and the second lower end cap and the third end cap realize the installation and support of the second sub-filter medium. Pure water is filtered through the second sub-filter medium and the first sub-filter medium in sequence, further improving the quality of pure water.

[0033] In some embodiments, there is a sealing fit between the outer wall of the first sub-filter medium and the inner wall of the third end cap; and / or, there is a sealing fit between the outer wall of the second sub-filter medium and the inner wall of the third end cap.

[0034] Advantageous effects: Thus, it is possible to prevent the pure water inside the first sub-filter medium from flowing into the second gap and the pure water in the second gap from flowing into the first sub-filter medium without being filtered, so as to prevent the pure water in the second gap from flowing into the central flow channel without being filtered and the pure water in the central flow channel from flowing back into the second gap.

[0035] In some embodiments, the filter housing includes a filter bottle body and a filter bottle cap. One end of the bottom of the filter bottle body is open, and one end of the top of the filter bottle body is closed. The filter bottle cap is sealingly installed on the open end of the filter bottle body.

[0036] Advantageous effects: The filter housing is arranged in the form of including a filter bottle body and a filter bottle cap, which is convenient for manufacturing and also convenient for assembling components such as the composite filter element inside the filter housing.

[0037] In some embodiments, the filter bottle cap and the filter bottle body are detachably connected.

[0038] Advantageous effects: The detachable connection between the filter bottle cap and the filter bottle body facilitates the disassembly and assembly between the filter bottle cap and the filter bottle body, and is convenient for overhauling and replacing the internal composite filter element.

[0039] In some embodiments, a cross-shaped protrusion is provided on the outer surface of the filter bottle cap.

[0040] Advantageous effects: The cross-shaped protrusion can be engaged with an external tool, thereby facilitating and labor-saving rotation of the filter bottle cap to open the filter bottle body.

[0041] In some embodiments, a secondary filter element support position is provided on the inner surface of the filter bottle cap, and the secondary filter element is installed at the secondary filter element support position.

[0042] Beneficial effects: The provision of the secondary filter element support position can facilitate the installation of the secondary filter element and also support and position the bottom of the secondary filter element, ensuring its stability during use.

[0043] The second aspect of the present utility model provides a water purification device, including the filter element assembly of the present utility model.

[0044] Beneficial effects: Since the water purification device of the present utility model includes the filter element assembly of the present utility model, it has the same technical effects as the filter element assembly, and the present utility model will not elaborate herein. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0046] Figure 1 Schematic diagram of the overall structure of the filter element assembly according to an embodiment of the present utility model;

[0047] Figure 2 Schematic diagram of the three-dimensional exploded structure of the filter element assembly according to an embodiment of the present utility model;

[0048] Figure 3 Schematic diagram of the structure of the filter bottle body according to an embodiment of the present utility model;

[0049] Figure 4 Top view structure diagram of the filter bottle cap according to an embodiment of the present utility model;

[0050] Figure 5 Bottom view structure diagram of the filter bottle cap according to an embodiment of the present utility model;

[0051] Figure 6 Cross-sectional view of the primary filter element according to an embodiment of the present utility model;

[0052] Figure 7 Cross-sectional view of the secondary filter element according to an embodiment of the present utility model;

[0053] Figure 8 Top view structure diagram of the water circuit board according to an embodiment of the present utility model;

[0054] Figure 9Schematic diagram of the bottom view structure of the water circuit board according to an embodiment of the present utility model;

[0055] Figure 10 Cross-sectional view of the water circuit board along the first water circuit according to an embodiment of the present utility model;

[0056] Figure 11 Cross-sectional view of the water circuit board along the second water circuit and the third water circuit according to an embodiment of the present utility model;

[0057] Figure 12 Schematic diagram of the structure of the partition part according to an embodiment of the present utility model;

[0058] Figure 13 Schematic diagram of the three-dimensional exploded structure of the ultrasonic cleaner according to an embodiment of the present utility model;

[0059] Figure 14 Cross-sectional view of the ultrasonic cleaner according to an embodiment of the present utility model;

[0060] Figure 15 Cross-sectional view of the filter element assembly according to an embodiment of the present utility model;

[0061] Figure 16 Schematic diagram of the raw water flow when the primary filter element of the filter element assembly according to an embodiment of the present utility model is working;

[0062] Figure 17 Schematic diagram of the pure water flow when the secondary filter element of the filter element assembly according to an embodiment of the present utility model is working.

[0063] Description of the reference numerals in the drawings

[0064] 10. Filter housing; 11. Filter bottle body; 111. Mounting hole; 112. First water inlet; 113. First water outlet; 114. Second water inlet; 115. Second water outlet; 12. Filter bottle cap; 121. Cross-shaped protrusion; 122. Secondary filter element support position; 13. First filter chamber; 14. Second filter chamber;

[0065] 20. Composite filter element; 21. Primary filter element; 211. First filter material; 212. First upper end cap; 213. First lower end cap; 22. Secondary filter element; 221. Second filter material; 2211. First sub-filter material; 2212. Second sub-filter material; 222. Central flow channel; 223. Second upper end cap; 224. Second lower end cap; 225. Third end cap;

[0066] 30. Water circuit board; 31. First water circuit; 32. Second water circuit; 33. Third water circuit; 34. First mounting position; 35. Second mounting position; 36. Third mounting position; 37. First seal; 38. Second seal; 39. Third seal

[0067] 40. Separation part; 41. Support part; 42. First gap; 43. Second gap;

[0068] 50. Ultrasonic cleaner; 51. Generator contact end; 511. Abutting projection; 52. Generator installation section; 521. Installation thread; 53. Generator main body; 54. Generator gasket; 55. Locking nut. Detailed implementation manners

[0069] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some but not all of the embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0070] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model 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 thus should not be construed as a limitation to the present utility model.

[0071] In the description of the present utility model, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection" and "coupling" 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0072] In addition, the technical features involved in the different embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0073] The following combines Figures 1 to 17 , to describe the embodiments of the present utility model.

[0074] As Figures 1 to 14As shown in the figure, according to an embodiment of the present utility model, on the one hand, a filter element assembly is disclosed, which includes a filter housing 10, a composite filter element 20 and a water circuit board 30. Among them, the filter housing 10 has an independent first filter cavity 13 and a second filter cavity 14 inside. The filter housing 10 has a first water inlet 112, a first water outlet 113, a second water inlet 114 and a second water outlet 115. The first water inlet 112 is communicated with the first filter cavity 13. The composite filter element 20 includes a primary filter element 21 and a secondary filter element 22. The primary filter element 21 is installed in the first filter cavity 13, and the secondary filter element 22 is installed in the second filter cavity 14. The water circuit board 30 is arranged in the filter housing 10. The water circuit board 30 has a first water circuit 31. The filtered rear end of the primary filter element 21 is communicated with the first water outlet 113 through the first water circuit 31. The water circuit board 30 has a second water circuit 32 and a third water circuit 33. The second water inlet 114 is communicated with the filtered front end of the secondary filter element 22 through the second water circuit 32. The filtered rear end of the secondary filter element 22 is communicated with the second water outlet 115 through the third water circuit 33.

[0075] For the filter element assembly of the present application, during filtration, raw water flows into the first filter cavity 13 from the first water inlet 112, and after being filtered by the primary filter element 21, it flows into the first water circuit 31 from the filtered rear end of the primary filter element 21 and flows through the first water circuit 31 to the first water outlet 113. External pure water flows through the second water circuit 32 from the second water inlet 114 and then flows into the filtered front end of the secondary filter element 22, and after being filtered by the secondary filter element 22, it flows into the third water circuit 33 from the filtered rear end of the secondary filter element 22 and flows through the third water circuit 33 to the second water outlet 115. Therefore, in the present application, the primary filter element 21 and the secondary filter element 22 are integrally arranged in the filter housing 10. The primary filter element 21 can achieve primary filtration of raw water, and the secondary filter element 22 can achieve re-filtration of pure water to ensure water quality. Moreover, the water circuit board 30 is provided to connect the primary filter element 21 and the secondary filter element 22 with the water inlets and outlets on the filter housing 10, eliminating the pipeline setting inside the filter element assembly, simplifying the overall structure of the filter element assembly and making it smaller in volume, which is more suitable for installation in a narrow space.

[0076] In some embodiments, the filter housing 10 includes a filter bottle body 11 and a filter bottle cap 12. Among them, one end of the bottom of the filter bottle body 11 is open, and one end of the top of the filter bottle body 11 is closed. The filter bottle cap 12 is sealed and installed on the open end of the filter bottle body 11.

[0077] The filter housing 10 is arranged in the form of including a filter bottle body 11 and a filter bottle cap 12, which is convenient for manufacturing and also convenient for assembling components such as the internal composite filter element 20 inside the filter housing 10.

[0078] In some embodiments, the filter bottle body 11 is cylindrical. An installation hole 111 is provided at the closed end of the filter bottle body 11. The first water inlet 112, the first water outlet 113, the second water inlet 114, and the second water outlet 115 are all arranged at intervals along the circumference of the installation hole 111. For example, the installation hole 111 is located at the center of the closed end of the filter bottle body 11, and the first water inlet 112, the first water outlet 113, the second water inlet 114, and the second water outlet 115 are evenly distributed at intervals of ninety degrees in sequence along the circumference of the installation hole 111, but it is not limited thereto.

[0079] The first water inlet 112 is connected to the raw water inlet end, and the second water inlet 114 is connected to the fine filter element to receive the purified water filtered by the fine filter element. The second water outlet 115 is connected to an external water intake end, so that the filtered clean water flows to the water intake end for use.

[0080] The filter bottle cap 12 and the filter bottle body 11 are matched in shape, and can be specifically set to be circular to match the cylindrical filter bottle body 11.

[0081] In some embodiments, the filter bottle cap 12 and the filter bottle body 11 are detachably connected. This facilitates the disassembly and assembly between the filter bottle cap 12 and the filter bottle body 11, and is convenient for overhauling and replacing the internal composite filter element 20.

[0082] For example, internal threads can be provided on the inner wall of the filter bottle cap 12, and external threads matching the internal threads can be provided on the outer wall of the filter bottle body 11. The filter bottle body 11 is screwed tightly into the filter bottle cap 12 to achieve detachable connection between the two, but it is not limited thereto. The filter bottle cap 12 and the filter bottle body 11 can also be detachably connected by means such as snap connection.

[0083] In some other embodiments, the installation between the filter bottle cap 12 and the filter bottle body 11 can also be a non-detachable structure, such as installation structures like welding, screw fastening, snap connection, and clamp.

[0084] To enhance the connection sealing performance between the filter bottle cap 12 and the filter bottle body 11, in some embodiments, a sealing structure is also provided at the connection between the filter bottle cap 12 and the filter bottle body 11.

[0085] For example, the sealing structure can be in the form of an O-ring, a gasket, etc.

[0086] For specific installation, an annular groove can be provided on the inner wall of the filter bottle cap 12 or the outer wall of the filter bottle body 11. The sealing structure is installed in the annular groove and elastically abuts against the other part to achieve the sealing of the inner cavity of the filter bottle body 11 and prevent the composite filter element from leaking water. For example, an annular groove is provided on the outer wall of the filter bottle body 11, and the sealing structure is installed in the annular groove and elastically abuts against the inner wall of the filter bottle cap 12, but it is not limited thereto.

[0087] In terms of the set quantity, to enhance the sealing performance, the sealing structure can be set to multiple and arranged at intervals along the length direction of the filter bottle body 11.

[0088] In some embodiments, a cross-shaped protrusion 121 is provided on the outer surface of the filter bottle cap 12.

[0089] The cross-shaped protrusion 121 can be engaged with an external tool, thereby facilitating and labor-saving rotation of the filter bottle cap 12 to open the filter bottle body 11.

[0090] In some embodiments, a secondary filter element support position 122 is provided on the inner surface of the filter bottle cap 12, and the secondary filter element 22 is installed at the secondary filter element support position 122.

[0091] The setting of the secondary filter element support position 122 can facilitate the installation of the secondary filter element 22 and also support and position the bottom of the secondary filter element 22 to ensure its stability during use.

[0092] Specifically, the secondary filter element support position 122 is located at the central position of the filter bottle cap 12, and a positioning groove is provided at the central part of the secondary filter element support position 122. The bottom surface of the secondary filter element 22 abuts against the secondary filter element support position 122 and is partially inserted into the positioning groove for positioning.

[0093] In some embodiments, the filter element assembly further includes a partition part 40 provided in the filter housing 10. The partition part 40 is sealingly connected to the water circuit board 30. A first filter cavity 13 is formed between the outer wall of the partition part 40 and the inner wall of the filter housing 10, and a second filter cavity 14 is formed in the inner cavity of the partition part 40.

[0094] The partition part 40 can divide the inner cavity of the filter housing 10 to form a first filter cavity 13 between the outer wall of the partition part 40 and the inner wall of the filter housing 10, and a second filter cavity 14 is formed in the inner cavity of the partition part 40, facilitating the installation of the primary filter element 21 and the secondary filter element 22.

[0095] In this embodiment, the partition part 40 is in the shape of a through cylinder, specifically, it can be set as a cylinder with a smaller diameter at the top and a larger diameter at the bottom. The bottom of the partition part 40 is sealingly installed on the inner surface of the filter bottle cap 12, and the top of the partition part 40 is sealingly installed on the water circuit board 30, so that both ends of the partition part 40 are sealed, and a sealed second filter cavity 14 is formed by the cooperation between the inner wall of the partition part 40, the inner surface of the filter bottle cap 12 and the lower surface of the water circuit board 30.

[0096] In some embodiments, a plurality of support parts 41 are annularly provided on the outer periphery of the partition part 40, and the plurality of support parts 41 abut against the inner wall of the filter housing 10.

[0097] By providing the plurality of support parts 41, the periphery of the partition part 40 can be supported to ensure the installation stability of the partition part 40 in the filter housing 10.

[0098] For example, the support portion 41 can be provided on the outer periphery of the lower end of the partition portion 40 with a larger diameter. Specifically, four support portions 41 can be provided and evenly distributed along the outer periphery of the lower end of the partition portion 40 at 90-degree intervals, so as to achieve uniform support around the partition portion 40. However, it is not limited to this. In other embodiments, the number and setting position of the partition portions 40 can be adjusted as needed.

[0099] In some embodiments, the primary filter element 21 is sleeved on the outer periphery of the partition portion 40 and there is a first gap 42 between the two, and the first gap 42 forms the filtration rear end of the primary filter element 21.

[0100] The partition portion 40 realizes the installation and fixation of the primary filter element 21, and forms a first gap 42 between the inner wall of the primary filter element 21 and the outer wall of the partition portion 40. The raw water in the first filter chamber 13 can enter the first gap 42 after being filtered by the primary filter element 21 and then flow to the first water passage 31 of the water circuit board 30.

[0101] In this embodiment, the primary filter element 21 is sleeved on the outer periphery of the upper end of the partition portion 40 with a smaller diameter, and the bottom of the primary filter element 21 is supported by abutting against the end of the larger-diameter portion of the partition portion 40.

[0102] In some embodiments, to ensure the filtration effect of the primary filter element 21, the upper end of the primary filter element 21 can be hermetically connected to the water circuit board 30, and the inner wall of the lower end of the primary filter element 21 and the outer wall of the partition portion 40 are hermetically connected, so as to form a sealed first gap 42, so that the raw water in the first filter chamber 13 can only flow into the first gap 42 after being filtered through the primary filter element 21, ensuring the filtered water quality.

[0103] In some embodiments, the secondary filter element 22 is provided inside the partition portion 40 and there is a second gap 43 between the two, and the second gap 43 forms the filtration front end of the secondary filter element 22, and the central flow channel 222 of the secondary filter element 22 forms the filtration rear end of the secondary filter element 22.

[0104] The partition portion 40 realizes the outer peripheral installation and limitation of the secondary filter element 22, and forms a second gap 43 between the outer wall of the secondary filter element 22 and the inner wall of the partition portion 40. The pure water from the second water passage 32 can flow into the second gap 43 and flow into the central flow channel 222 after being filtered by the secondary filter element 22 and then flow to the third water passage 33 of the water circuit board 30.

[0105] In this embodiment, the secondary filter element 22 is cylindrical, and its length is the same as that of the partition portion 40. The diameter of the secondary filter element 22 is smaller than the inner diameter of the partition portion 40, so that the secondary filter element 22 can be inserted into the partition portion 40 and a second gap 43 can be formed between the two.

[0106] For specific installation, the bottom of the secondary filter element 22 abuts against the secondary filter element support position 122 of the filter bottle cap 12, and the top of the secondary filter element 22 is connected to the water circuit board 30. In some embodiments, to ensure the filtering effect of the secondary filter element 22, the upper end of the secondary filter element 22 can be hermetically connected to the water circuit board 30, and the outer wall of the lower end of the secondary filter element 22 is hermetically connected to the inner wall of the partition portion 40, thereby forming a sealed second gap 43, so that the pure water entering the second gap 43 can only permeate through the secondary filter element 22 and flow out through the central flow channel 222, ensuring the quality of the filtered pure water.

[0107] In some embodiments, a first installation position 34 is provided on the surface of the water circuit board 30 facing the second filter chamber 14, and the end of the primary filter element 21 is hermetically inserted into the first installation position 34.

[0108] The first installation position 34 provided on the water circuit board 30 facilitates the installation of the primary filter element 21, and hermetically inserting the end of the primary filter element 21 into the first installation position 34 realizes the sealing of the first gap 42, preventing the raw water filtered by the primary filter element 21 from leaking back to the first filter chamber 13 from the connection between the primary filter element 21 and the first installation position 34.

[0109] In some embodiments, a first sealing member 37 is provided between the outer wall of the primary filter element 21 and the inner wall of the first installation position 34.

[0110] The first sealing member 37 realizes the sealing between the outer wall of the primary filter element 21 and the inner wall of the first installation position 34, ensuring the sealing reliability.

[0111] In some embodiments, a second installation position 35 is provided on the surface of the water circuit board 30 facing the second filter chamber 14, the second installation position 35 is located inside the first installation position 34, and the end of the partition portion 40 is hermetically inserted into the second installation position 35.

[0112] The second installation position 35 provided on the water circuit board 30 facilitates the installation of the partition portion 40, and hermetically inserting the end of the partition portion 40 into the second installation position 35 realizes the sealed separation of the first gap 42 and the second gap 43, preventing the raw water in the first gap 42 from flowing into the second gap 43 and also preventing the pure water in the second gap 43 from flowing into the first gap 42, ensuring the independence of the filtration of the primary filter element 21 and the secondary filter element 22 respectively.

[0113] In some embodiments, a second sealing member 38 is provided between the outer wall of the partition portion 40 and the inner wall of the second installation position 35.

[0114] The second sealing member 38 realizes the sealing between the outer wall of the partition portion 40 and the inner wall of the second installation position 35, ensuring the sealing reliability.

[0115] In some embodiments, a third mounting position 36 is provided on one side of the water circuit board 30 facing the second filter chamber 14. The third mounting position 36 is located inside the second mounting position 35, and the end of the secondary filter element 22 is hermetically inserted into the third mounting position 36.

[0116] The third mounting position 36 provided on the water circuit board 30 facilitates the installation of the secondary filter element 22. Moreover, hermetically inserting the end of the secondary filter element 22 into the third mounting position 36 realizes the sealed separation of the second gap 43 and the central flow channel 222, preventing the pure water in the second gap 43 from flowing into the central flow channel 222, and also preventing the purified water filtered by the secondary filter element 22 from flowing into the second gap 43 from the central flow channel 222, ensuring the sealed separation between the second gap 43 and the central flow channel 222.

[0117] In some embodiments, a third seal 39 is provided between the outer wall of the secondary filter element 22 and the inner wall of the third mounting position 36.

[0118] The third seal 39 realizes the seal between the outer wall of the secondary filter element 22 and the inner wall of the third mounting position 36, ensuring the sealing reliability.

[0119] Specifically, the first seal 37, the second seal 38, and the third seal 39 can be O-rings, annular gaskets, etc., and no specific limitation is made in this embodiment.

[0120] Specifically in terms of the structural form, the first mounting position 34, the second mounting position 35, and the third mounting position 36 are all circular grooves extending away from the lower surface of the water circuit board 30. Moreover, the diameter of the first mounting position 34 > the diameter of the second mounting position 35 > the diameter of the third mounting position. The size of the first mounting position 34 matches the diameter of the primary filter element 21, the size of the second mounting position 35 matches the diameter of the partitioning portion 40, and the size of the third mounting position 36 matches the diameter of the secondary filter element 22.

[0121] It can be understood that after installation, there is a gap between the inner wall of the primary filter element 21 and the outer wall of the second mounting position 35, and there is a gap between the inner wall of the partitioning portion 40 and the outer wall of the third mounting position 36. The first gap 42 communicates with the first water circuit 31 of the water circuit board 30 through the gap between the inner wall of the primary filter element 21 and the outer wall of the second mounting position 35, and the second water circuit 32 of the water circuit board 30 communicates with the second gap 43 through the gap between the inner wall of the partitioning portion 40 and the outer wall of the third mounting position 36.

[0122] In some embodiments, the primary filter element 21 includes a first filter medium 211, a first upper end cap 212, and a first lower end cap 213. Among them, the first filter medium 211 is sleeved on the outer periphery of the partition portion 40. The first upper end cap 212 is connected to one end of the top of the first filter medium 211. The first upper end cap 212 is hermetically inserted into the first installation position 34. The first lower end cap 213 is connected to one end of the bottom of the first filter medium 211, and a sealing fit is formed between the first lower end cap 213 and the outer wall of the partition portion 40.

[0123] The first upper end cap 212 and the first lower end cap 213 respectively support the top and bottom of the first filter medium 211, facilitating the installation and connection of the first filter medium 211. Through the sealing fit between the first upper end cap 212 and the first installation position 34, and the sealing fit between the first lower end cap 213 and the partition portion 40, a sealed first gap 42 can be formed.

[0124] The first filter medium 211 can specifically be made of activated carbon material to perform primary filtration on the raw water to adsorb large particulate impurities in the raw water. However, the type of the first filter medium 211 is not limited to this, and it can also be set to be made of a composite of activated carbon and PP cotton.

[0125] For example, the first filter medium 211 is cylindrical, and both the first upper end cap 212 and the first lower end cap 213 are circular ring caps and are matched with the first filter medium 211. A first annular card slot is provided at one end of the first upper end cap 212 facing the first filter medium 211, and the top of the first filter medium 211 is clamped in the first annular card slot. A second annular card slot is provided at one end of the first lower end cap 213 facing the first filter medium 211, and the bottom of the first filter medium 211 is clamped in the second annular card slot, thereby realizing the clamping and fixing of the top and bottom of the first filter medium 211 respectively.

[0126] A first seal 37 is provided between the outer wall of the first upper end cap 212 and the inner wall of the first installation position 34, and a sealing structure is provided between the inner wall of the first lower end cap 213 and the outer wall of the partition portion 40 to ensure the sealing performance of the first gap 42.

[0127] In some embodiments, the secondary filter element 22 includes a second filter medium 221, a second upper end cap 223, and a second lower end cap 224. Among them, the second filter medium 221 is arranged in the inner cavity of the partition portion 40. A central flow channel 222 is provided in the middle of the second filter medium 221. The second upper end cap 223 is connected to one end of the top of the second filter medium 221. The second upper end cap 223 is hermetically inserted into the third installation position 36. The second lower end cap 224 is connected to one end of the bottom of the second filter medium 221, and a sealing fit is formed between the second lower end cap 224 and the inner wall of the partition portion 40, and the second lower end cap 224 abuts against and supports the bottom of the filter housing 10.

[0128] The second upper end cap 223 and the second lower end cap 224 respectively support the top and bottom of the second filter medium 221, facilitating the installation and connection of the second filter medium 221. Through the sealing fit between the second upper end cap 223 and the third installation position 36, and the sealing fit between the second lower end cap 224 and the partition portion 40, the second gap 43 and the intermediate flow channel can be hermetically separated to ensure their respective independent sealing properties.

[0129] In some embodiments, the second filter medium 221 includes a first sub-filter medium 2211 and a second sub-filter medium 2212. Among them, the first sub-filter medium 2211 is connected to the second upper end cap 223, the second sub-filter medium 2212 is connected to the second lower end cap 224, the central flow channel 222 is opened at the center of the second sub-filter medium 2212, the first sub-filter medium 2211 is communicated with the central flow channel 222, pure water enters the central flow channel 222 after being filtered by the second sub-filter medium 2212, and flows through the first sub-filter medium 2211 and then into the third water path 33. The secondary filter element 22 further includes a third end cap 225, and the first sub-filter medium 2211 and the second sub-filter medium 2212 are connected through the third end cap 225.

[0130] The second filter medium 221 is arranged in the form of a first sub-filter medium 2211 and a second sub-filter medium 2212. The second upper end cap 223 and the third end cap 225 support the installation of the first sub-filter medium 2211, and the second lower end cap 224 and the third end cap 225 support the installation of the second sub-filter medium 2212. Pure water is filtered successively through the second sub-filter medium 2212 and the first sub-filter medium 2211, further improving the quality of pure water.

[0131] For example, the first sub-filter medium 2211 is a membrane filament filter element, and the second sub-filter medium 2212 is activated carbon. Pure water is adsorbed and filtered by the activated carbon and then flows into the membrane filament filter element through the central flow channel 222 for ultrafiltration, and the filtered purified water flows into the third water path 33.

[0132] It should be noted here that by setting the filtration particle sizes of the first sub-filter medium 2211 and the second sub-filter medium 2212, the resistance of pure water passing through them is different, so that pure water first passes through the second sub-filter medium 2212 for filtration and then flows through the first sub-filter medium 2211 for filtration. For example, the filtration particle size of the first sub-filter medium 2211 is smaller than that of the second sub-filter medium 2212, so that the resistance of pure water passing through the first sub-filter medium 2211 is greater than that of passing through the second sub-filter medium 2212. Therefore, the pure water in the second gap 43 will preferentially pass through the second sub-filter medium 2212 for filtration.

[0133] Specifically, the first sub-filter medium 2211 includes a housing and membrane filament filter media disposed within the housing. The first sub-filter medium 2211 is cylindrical. Third annular clamping grooves are provided on both the second upper end cap 223 and the third end cap 225. The top and bottom of the first sub-filter medium 2211 are respectively clamped in the third annular clamping grooves on the second upper end cap 223 and the third end cap 225 to achieve clamping and fixation.

[0134] Moreover, the third seal 39 is disposed between the outer wall of the second upper end cap 223 and the inner wall of the third mounting position 36. A sealing fit is provided between the outer wall of the first sub-filter medium 2211 and the inner wall of the third end cap 225, thereby preventing the pure water inside the first sub-filter medium 2211 from flowing into the second gap 43 and preventing the pure water in the second gap 43 from flowing into the first sub-filter medium 2211 without being filtered. For example, a sealing structure is provided between the inner wall of the third end cap 225 and the outer wall of the first sub-filter medium 2211 for sealing.

[0135] The second sub-filter medium 2212 is cylindrical. Fourth annular clamping grooves are provided on both the second lower end cap 224 and the third end cap 225. The top and bottom of the second sub-filter medium 2212 are respectively clamped in the fourth annular clamping grooves on the second lower end cap 224 and the third end cap 225 to achieve clamping and fixation.

[0136] In some embodiments, a sealing fit is provided between the outer wall of the second sub-filter medium 2212 and the inner wall of the third end cap 225 to prevent the pure water in the second gap 43 from flowing into the central flow channel 222 without being filtered and to prevent the pure water in the central flow channel 222 from flowing back into the second gap 43.

[0137] For example, a sealing structure is provided between the outer wall of the second sub-filter medium 2212 and the inner wall of the third end cap 225 for sealing. Similarly, to prevent the pure water in the second gap 43 from flowing into the first filter chamber 13, a sealing structure is also provided between the outer wall of the second lower end cap 224 and the inner wall of the partition portion 40 for sealing.

[0138] Specifically for installation, the lower surface of the water circuit board 30 is connected to the first-stage filter element 21, the partition portion 40, and the second-stage filter element 22. The upper surface of the water circuit board 30 abuts against the inner wall of the closed end of the filter bottle body 11. At the same time, the bottom of both the partition portion 40 and the second-stage filter element 22 abuts against the filter bottle cap 12, thereby achieving the overall fixed installation of the water circuit board 30, the first-stage filter element 21, the partition portion 40, and the second-stage filter element 22 inside the filter housing 10.

[0139] Further, the water outlet of the first waterway 31, the water inlet of the second waterway 32, and the water outlet of the third waterway 33 all extend away from the upper surface of the waterway plate 30 into columnar structures, and the waterway plate 30 is fixed by abutting the columnar structures against the inner wall of the filter housing 10, and the water outlet of the first waterway 31 is correspondingly communicated with the first water outlet 113, the water inlet of the second waterway 32 is correspondingly communicated with the second water inlet 114, and the water outlet of the third waterway 33 is correspondingly communicated with the second water outlet 115.

[0140] The first waterway 31, the second waterway 32, and the third waterway 33 are water flow channels independently opened on the waterway plate 30 respectively. As an arrangement scheme, the second waterway 32 and the third waterway 33 are arranged in a straight line on the waterway plate 30, and the first waterway 31 is perpendicular to the second waterway 32 and the third waterway 33.

[0141] In some embodiments, the filter element assembly further includes an ultrasonic cleaner 50, which is installed in the filter housing 10 and the ultrasonic cleaner 50 is communicated with at least one of the first filter chamber 13 and the second filter chamber 14. The ultrasonic cleaner 50 is used to send ultrasonic waves to the solution in the first filter chamber 13 and the second filter chamber 14 to realize ultrasonic cleaning of the primary filter element 21 and / or the secondary filter element 22.

[0142] By setting the ultrasonic cleaner 50, ultrasonic cleaning of the primary filter element 21 and / or the secondary filter element 22 can be realized. Compared with physical scrubbing or chemical solvent immersion, ultrasonic cleaning not only has higher cleaning efficiency, but also does not damage the filter element material, ensuring its service life. At the same time, it can effectively remove the tiny particles inside the filter element, ensuring the regeneration effect of the filter element.

[0143] In some embodiments, the filter element assembly further includes a controller, and the controller is electrically connected to the ultrasonic cleaner 50. The controller is used to control the working mode of the ultrasonic cleaner 50 to realize the control of the working mode of the ultrasonic cleaner 50 and achieve different cleaning effects.

[0144] For example, the working modes of the ultrasonic cleaner 50 include continuously sending ultrasonic waves and intermittently sending ultrasonic waves. The controller can be used to control the ultrasonic cleaner 50 to continuously send ultrasonic waves and intermittently send ultrasonic waves, so as to realize different cleaning methods for the primary filter element 21 and / or the secondary filter element 22.

[0145] In this embodiment, the ultrasonic cleaner 50 is communicated with the first filter chamber 13. The ultrasonic cleaner 50 is hermetically installed in the mounting hole 111 and partially extends into the first filter chamber 13 to realize ultrasonic cleaning of the primary filter element 21. Of course, in other embodiments, the ultrasonic cleaner 50 can also be communicated with the second filter chamber 14 to perform ultrasonic cleaning on the secondary filter element 22, which is not limited to this embodiment.

[0146] In terms of the specific structure, the ultrasonic cleaner 50 includes a generator contact end 51, a generator mounting section 52, and a generator main body 53. Among them, the generator contact end 51 is located in the first filter chamber 13. The generator mounting section 52 is fixedly connected to the generator contact end 51. The generator mounting section 52 is sealingly installed in the mounting hole 111 of the filter housing 10. The generator main body 53 is located outside the filter housing 10 and is fixedly connected to one end of the generator mounting section 52 away from the generator contact end 51.

[0147] The ultrasonic cleaner 50 is installed and fixed on the filter housing 10 through the generator mounting section 52. The generator main body 53 is used to be electrically connected to a power source to control the generator contact end 51 to send ultrasonic waves to the first filter chamber 13.

[0148] Specifically, the generator main body 53 is electrically connected to a controller. The controller controls the power on and off of the generator main body 53, thereby controlling the working mode of the ultrasonic cleaner 50.

[0149] The generator mounting section 52 and the filter housing 10 are detachably connected to facilitate the disassembly, assembly, and replacement of the ultrasonic cleaner 50. For example, the outer periphery of the generator mounting section 52 is provided with mounting threads 521, and the outer periphery of the generator contact end 51 is provided with abutting protrusions 511. The generator mounting section 52 is inserted into the mounting hole 111 and the abutting protrusions 511 abut against the inner wall of the filter housing 10. The locking nut 55 outside the filter housing 10 is screwed onto the mounting threads 521 to clamp the ultrasonic cleaner 50 in the mounting hole 111.

[0150] To further enhance the sealing performance at the installation location of the ultrasonic cleaner 50, the ultrasonic cleaner 50 further includes a generator gasket 54. The generator gasket 54 is arranged between the abutting protrusions 511 and the inner wall of the filter housing 10 to seal the mounting hole 111 and prevent the raw water in the first filter chamber 13 from leaking out from here.

[0151] It should be noted that the above describes in detail the scheme of clamping the ultrasonic cleaner 50 to the filter housing 10 by the locking nut 55. In some other embodiments, the ultrasonic cleaner 50 can also be connected to the filter housing 10 by means of screw fastening, snap connection, clamp, or adhesive fixation, not limited to the above scheme.

[0152] Of course, the above generator gasket 54 can specifically be an annular gasket, an O-ring, or a special-shaped gasket, etc. This embodiment does not make specific limitations.

[0153] Of course, in some other embodiments, the primary filter element 21 and the secondary filter element 22 may also be filtration filter elements such as activated carbon fiber, carbon rod, PP cotton, ultrafiltration membrane, etc., which are specifically selected and set according to the filtration requirements, not limited to the above description.

[0154] To facilitate the understanding of the filter element assembly of this embodiment, the working principle thereof is introduced as follows:

[0155] As Figure 15 and Figure 16 shown, the primary filter element 21 filters: raw water flows into the first filter chamber 13 from the first water inlet 112, and after being filtered by the primary filter element 21, it enters the first gap 42, flows along the first gap 42 into the first water path 31 and flows out of the filter element assembly through the first water path 31 and the first water outlet 113, completing the primary filtration of the raw water;

[0156] As Figure 15 and Figure 17 shown, the secondary filter element 22 filters: pure water flows into the second water path 32 from the second water inlet 114 and flows into the second gap 43 through the second water path 32. The pure water flows along the second gap 43 to the second sub-filter material 2212, is filtered by the second sub-filter material 2212 and then flows to the first sub-filter material 2211 for further filtration, and then flows into the third water path 33 and flows out of the filter element assembly through the third water path 33 and the second water outlet 115, completing the re-filtration of the pure water;

[0157] When it is necessary to clean the primary filter element 21, the solution flows from the first water outlet 113 through the first water path 31 into the first gap 42, and the primary filter element 21 can be backwashed. The rinsed solution passes through the primary filter element 21 and enters the first filter chamber 13. At the same time, the controller turns on the ultrasonic cleaner 50 to send ultrasonic waves into the solution, and the ultrasonic waves are used to ultrasonically clean the primary filter element 21, so as to thoroughly clean the particulate dirt adhering to the primary filter element 21. The cleaned solution is discharged from the first water inlet 112.

[0158] Of course, the above description is only for better understanding the filter element assembly of this application and is not construed as a limitation on the protection scope of this application. For example, when cleaning the primary filter element 21, the solution can also flow into the first filter chamber 13 from the first water inlet 112, and at the same time, the controller turns on the ultrasonic cleaner 50 to send ultrasonic waves into the solution, and the ultrasonic cleaning of the primary filter element 21 can also be achieved.

[0159] According to an embodiment of the present invention, in a second aspect, a water purification device is provided, including the filter element assembly of the present invention.

[0160] Since the water purification device of this embodiment includes the filter element assembly of this embodiment, it has the same technical effects as the filter element assembly, and will not be elaborated herein.

[0161] In summary, by integrating the structures of the primary filter element 21 and the secondary filter element 22, the present application can achieve a streamlined and compact internal structure of the filter element assembly to adapt to the installation in a narrow space. Moreover, by providing the ultrasonic cleaner 50, the dirt on the surface of the primary filter element 21 and / or the secondary filter element 22 can be efficiently and automatically cleaned by the emitted ultrasonic waves, realizing the regeneration of the filter element.

[0162] Although the embodiments of the present utility model have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present utility model, and such modifications and variations all fall within the scope defined by this application.

Claims

1. A filter element assembly, characterized in that: include: A filter housing (10) having a first filter chamber (13) and a second filter chamber (14) which are independent of each other, the filter housing (10) having a first water inlet (112), a first water outlet (113), a second water inlet (114) and a second water outlet (115), the first water inlet (112) and the first filter chamber (13) being in communication; A composite filter element (20) comprising a primary filter element (21) and a secondary filter element (22), wherein the primary filter element (21) is installed in the first filter cavity (13) for primary filtering of raw water, and the secondary filter element (22) is installed in the second filter cavity (14) for secondary filtering of pure water; a waterway plate (30) arranged in the filter housing (10), the waterway plate (30) having a first waterway (31), the filtering rear end of the primary filter element (21) being connected to the first water outlet (113) through the first waterway (31), raw water flowing into the first filter cavity (13) from the first water inlet (112), and after being filtered by the primary filter element (21), flowing into the first waterway (31) from the filtering rear end of the primary filter element (21), and flowing to the first water outlet (113) through the first waterway (31); The waterway plate (30) comprises a second waterway (32) and a third waterway (33); the second water inlet (114) is connected to the filtering front end of the secondary filter element (22) through the second waterway (32); the filtering rear end of the secondary filter element (22) is connected to the second water outlet (115) through the third waterway (33); pure water flows from the second water inlet (114) through the second waterway (32) and then flows into the filtering front end of the secondary filter element (22); after being filtered by the secondary filter element (22), the pure water flows from the filtering rear end of the secondary filter element (22) into the third waterway (33) and flows to the second water outlet (115) through the third waterway (33).

2. The filter element assembly according to claim 1, characterized in that: The filter element assembly further comprises a partition (40) arranged in the filter housing (10); the partition (40) and the waterway plate (30) are sealed and connected; the first filter cavity (13) is formed between the outer wall of the partition (40) and the inner wall of the filter housing (10); and the inner cavity of the partition (40) forms the second filter cavity (14).

3. The filter element assembly according to claim 2, characterized in that: The primary filter element (21) is sleeved on the outer periphery of the partition (40) with a first gap (42) therebetween, and the first gap (42) forms the filtering rear end of the primary filter element (21).

4. The filter element assembly according to claim 3, characterized in that: The secondary filter element (22) is arranged inside the partition (40) with a second gap (43) therebetween, the second gap (43) forming a filtering front end of the secondary filter element (22), and the central flow channel (222) of the secondary filter element (22) forming a filtering rear end of the secondary filter element (22).

5. The filter element assembly according to any one of claims 2 to 4, characterized in that: A first installation position (34) is provided on a side of the waterway plate (30) facing the second filter chamber (14), and an end of the primary filter element (21) is sealed and plugged into the first installation position (34).

6. The filter element assembly according to claim 5, characterized in that: A second mounting position (35) is provided on one side of the waterway plate (30) facing the second filter chamber (14); the second mounting position (35) is located inside the first mounting position (34); and an end of the partition (40) is sealed and plugged into the second mounting position (35).

7. The filter element assembly according to claim 6, characterized in that: A third mounting position (36) is provided on one side of the waterway plate (30) facing the second filter chamber (14); the third mounting position (36) is located inside the second mounting position (35); and the end of the secondary filter element (22) is sealed and plugged into the third mounting position (36).

8. The filter element assembly according to claim 5, characterized in that: A first sealing member (37) is provided between the outer wall of the primary filter element (21) and the inner wall of the first installation position (34).

9. The filter element assembly according to claim 6, characterized in that: A second sealing member (38) is provided between the outer wall of the partition (40) and the inner wall of the second mounting position (35).

10. The filter element assembly according to claim 7, characterized in that: A third sealing member (39) is provided between the outer wall of the secondary filter element (22) and the inner wall of the third installation position (36).

11. The filter element assembly according to any one of claims 2 to 4, characterized in that: A plurality of support portions (41) are provided in an annular shape on the outer periphery of the partition portion (40), and the plurality of support portions (41) abut against the inner wall of the filter housing (10).

12. The filter element assembly according to claim 5, characterized in that: The primary filter element (21) comprises: A first filter material (211) is sleeved on the outer periphery of the partition (40); A first upper end cover (212) is connected to one end of the top of the first filter material (211), and the first upper end cover (212) is sealed and plugged into the first installation position (34); The first lower end cover (213) is connected to one end of the bottom of the first filter material (211), and the first lower end cover (213) and the outer wall of the partition (40) are sealed.

13. The filter element assembly according to claim 7, characterized in that: The secondary filter element (22) comprises: A second filter material (221) is arranged in the inner cavity of the partition (40), and a central flow channel (222) is provided in the middle of the second filter material (221); A second upper end cover (223) is connected to one end of the top of the second filter material (221), and the second upper end cover (223) is sealed and plugged into the third installation position (36); The second lower end cover (224) is connected to one end of the bottom of the second filter material (221); the second lower end cover (224) and the inner wall of the partition (40) are sealed and matched, and the second lower end cover (224) is supported by the bottom of the filter housing (10).

14. The filter element assembly according to claim 13, characterized in that: The second filter material (221) comprises a first sub-filter material (2211) and a second sub-filter material (2212); the first sub-filter material (2211) is connected to the second upper end cover (223); the second sub-filter material (2212) is connected to the second lower end cover (224); the central flow channel (222) is opened at the center of the second sub-filter material (2212); the first sub-filter material (2211) and the central flow channel (222) are connected; pure water is filtered through the second sub-filter material (2212) and enters the central flow channel (222); and flows through the first sub-filter material (2211) and then flows into the third water channel (33); The secondary filter element (22) further comprises a third end cap (225), and the first sub-filter material (2211) and the second sub-filter material (2212) are connected via the third end cap (225).

15. The filter element assembly according to claim 14, characterized in that: The outer wall of the first sub-filter material (2211) and the inner wall of the third end cap (225) are sealed together; and / or the outer wall of the second sub-filter material (2212) and the inner wall of the third end cap (225) are sealed together.

16. The filter element assembly according to any one of claims 1 to 4, characterized in that: The filter housing (10) comprises: A filter bottle body (11), wherein one end of the bottom of the filter bottle body (11) is open and one end of the top of the filter bottle body (11) is closed; The filter bottle cover (12) is sealed and installed on the open opening of the filter bottle body (11).

17. The filter element assembly according to claim 16, characterized in that: The filter bottle cover (12) and the filter bottle body (11) are detachably connected.

18. The filter element assembly according to claim 16, characterized in that: The outer surface of the filter bottle cover (12) is provided with a cross protrusion (121).

19. The filter element assembly according to claim 16, characterized in that: The inner surface of the filter bottle cover (12) is provided with a secondary filter element support position (122), and the secondary filter element (22) is installed on the secondary filter element support position (122).

20. A water purification device, characterized in that: A filter element assembly comprising any one of claims 1 to 19.

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