Composite filter and water purification device

Abstract

The application discloses a composite filter element and a water purifying device, and relates to the technical field of water treatment.The composite filter element comprises a shell, an opening is formed at one end of the shell, a waterway joint is arranged at the opening, and the waterway joint is provided with a raw water channel, a purified water channel and a waste water channel; a front filter unit, a fine filter unit and a central pipe are arranged in the shell, the fine filter unit is wound outside the central pipe, the front filter unit is arranged outside the fine filter unit, and a first flow channel is formed between the front filter unit and the inner wall of the shell; a water flow guiding assembly is used for guiding raw water input by the raw water channel into the first flow channel and for guiding waste water generated after being filtered by the fine filter unit into the waste water channel; the central pipe is communicated with the purified water channel, and the like. On the basis of simple structure, the application can guide raw water to the inlet end of the front filter unit and simultaneously guide waste water generated by the fine filter unit to the waterway joint for discharge through the water flow guiding assembly.

Description

Technical Field

[0001] This invention relates to the field of water treatment technology, and in particular to a composite filter element and a water purification device. Background Technology

[0002] Currently, existing water purification devices all require multiple filter units with different filtration functions to filter raw water, ultimately producing purified water for the user. Installing multiple filter units separately in their respective filter bottles would result in an excessively large water purification device, potentially making it unsuitable for installation in confined spaces. Therefore, an increasing number of water purification devices on the market integrate multiple filter units into a single filter bottle to form a composite filter cartridge. For composite filter cartridges with a fine filtration unit that discharges wastewater during filtration, one method involves discharging the wastewater through an additional sleeve inserted within the fine filtration unit, which increases the radial dimension of the composite filter cartridge. Another method involves an end cap at the end of the fine filtration unit and a guide cap at the end of the central tube within the fine filtration unit. This guide cap can be inserted into a water inlet connector, creating a wastewater channel for discharge. This method requires an additional guide cap at the end of the central tube, resulting in more components and a more complex assembly of the entire composite filter cartridge. Therefore, there is a need to develop a new, simple composite filter element that can introduce raw water to the inlet of the flow unit while simultaneously discharging wastewater and purified water. Summary of the Invention

[0003] In order to overcome the above-mentioned defects of the prior art, the technical problem to be solved by the embodiments of the present invention is to provide a composite filter element and a water purification device, which, based on a simple structure, can guide raw water to the inlet end of the pre-filter unit through a water flow guiding component and at the same time guide the wastewater generated by the fine filter unit to the water circuit connector for discharge.

[0004] The specific technical solution of this invention is as follows:

[0005] A composite filter element, the composite filter element comprising:

[0006] The housing has an opening at one end, and a water connector is provided at the opening. The water connector has a raw water channel, a clean water channel, and a wastewater channel.

[0007] A pre-filter unit, a fine filter unit, and a central tube are disposed within the housing. The fine filter unit is wound around the outside of the central tube. The pre-filter unit is radially disposed outside the fine filter unit. A first flow channel is formed between the pre-filter unit and the inner wall of the housing.

[0008] A water flow guiding component is used to guide the raw water input from the raw water channel into the first flow channel, and the water flow guiding component is also used to guide the wastewater generated after filtration by the fine filtration unit into the wastewater channel.

[0009] The central pipe is connected to the water purification channel. The purified water produced after filtration by the fine filtration unit flows into the central pipe and is output through the water purification channel.

[0010] Preferably, the water flow guiding assembly includes a first cover and a first sealing structure between the first cover and the water connector. The first sealing structure is formed between the outlet of the raw water channel and the inlet of the wastewater channel. The raw water flowing in from the outlet of the raw water channel is guided from one side of the first cover to the first flow channel, and the wastewater generated after being filtered by the fine filtration unit is guided from the other side of the first cover to the inlet of the wastewater channel.

[0011] Preferably, the first cover is disposed on the ends of the pre-filter unit and the fine filter unit near the opening, the first cover completely blocks the end of the pre-filter unit near the opening, and the first cover partially blocks the end of the fine filter unit near the opening.

[0012] Preferably, the portion of the fine filtration unit that is blocked near the opening is located on the side near the pre-filtration unit.

[0013] Preferably, the first cover includes a first body extending in a radial direction and a first extension extending in an axial direction inside the first body; the first body completely seals the end of the pre-filter unit near the opening with a sealing material and partially seals the end of the fine filter unit near the opening with a sealing material; the inner wall of the first extension and the outer wall of the water connector have the first sealing structure.

[0014] Preferably, the end face of the first body facing the pre-filter unit and the fine filter unit has a groove capable of accommodating the sealing material.

[0015] Preferably, the end face of the first body facing away from the pre-filter unit and the fine filter unit has a first step portion at the connection with the first extension portion, and the first body and the first step portion form the groove.

[0016] Preferably, the inner wall of the first extension has a second stepped portion, and the inner wall of the first extension has a plurality of reinforcing portions distributed in a radially extending direction and a circumferential direction. The inner wall of the reinforcing portion abuts against the outer wall of the central tube to limit the central tube in the radial direction. The reinforcing portion is located on the side of the second stepped portion of the inner wall of the first extension facing the fine filtration unit.

[0017] Preferably, in the radial direction, the groove is located in the outer peripheral direction of the first extension and close to the first extension, the first extension extending in the axial direction to the end face of the fine filter unit and abutting against it, so as to block the sealing material and allow a portion of the sealing material between the first body and the fine filter unit to enter the groove.

[0018] Preferably, the end face of the first body facing away from the end of the pre-filter unit has reinforcing ribs.

[0019] Preferably, there are multiple reinforcing ribs, and at least some of the reinforcing ribs are arranged in parallel.

[0020] Preferably, some of the reinforcing ribs are connected to adjacent parallel reinforcing ribs.

[0021] Preferably, the first cover further includes a second extension extending axially on the outside of the first body, the second extension being sleeved on the pre-filter unit.

[0022] Preferably, the outer wall of the second extension has a plurality of protrusions distributed in the circumferential direction and extending in the circumferential direction of the first cover.

[0023] Preferably, a second flow channel is formed between the inner wall of the first extension, the outer wall of the water connector, and the first sealing structure, and the second flow channel connects the wastewater end of the fine filtration unit and the inlet of the wastewater channel.

[0024] Preferably, the wastewater flowing out from the end of the fine filtration unit near the water connector flows into the inlet of the wastewater channel through the second flow passage.

[0025] Preferably, the water connector and the central pipe have a second sealing structure, which isolates the second flow channel from the interior of the central pipe.

[0026] Preferably, the water connector includes a second body and a first insertion part extending in the axial direction, the first insertion part being located on the outer wall of the second body at one end facing the fine filtration unit, and the water purification channel including an annular space formed between the first insertion part and the outer wall of the second body;

[0027] The inlet of the wastewater channel is located on the outer wall of the first insertion part between the second sealing structure and the first sealing structure;

[0028] The wastewater channel passes through the outer wall of the first insertion part and at least part of the annular space, and then extends through the second body in a direction away from the fine filtration unit; at least part of the purified water channel, excluding the annular space, is disposed in the second body and extends along the axial direction of the water connector.

[0029] Preferably, the wastewater end of the fine filtration unit is located at the end of the fine filtration unit near the opening; the outer wall of the fine filtration unit is the raw water end; and the inner wall of the fine filtration unit is the purified water end.

[0030] Preferably, the outer wall of the water connector is sealed to the inner wall of the housing by a third sealing structure.

[0031] Preferably, the water flow guiding assembly includes a first cover and a first sealing structure between the first cover and the water connector, the first sealing structure being formed between the outlet of the raw water channel and the inlet of the wastewater channel; the outlet of the raw water channel is located between the third sealing structure on the outer wall of the water connector and the first sealing structure.

[0032] Preferably, the composite filter element further includes:

[0033] The post-filtration unit is installed inside the central pipe. The purified water filtered by the fine filtration unit enters the central pipe, and after being filtered by the post-filtration unit, it flows into the purified water channel for output.

[0034] Preferably, the post-filter unit is provided with a second cover at the end near the water inlet, and a fourth sealing structure is provided between the water inlet and the second cover; a third flow channel is formed inside the post-filter unit, and the water filtered by the post-filter unit flows into the purified water channel through the third flow channel for output; the fourth sealing structure isolates the water inlet of the post-filter unit from the third flow channel.

[0035] Preferably, the water connector includes a second body and a first insertion portion extending in the axial direction, the first insertion portion being located on the outer wall of the second body at one end facing the fine filtration unit; the water purification channel includes an annular space formed between the first insertion portion and the outer wall of the second body;

[0036] The second cover includes a third body for sealing the end of the post-filter unit and a second insertion portion extending in the axial direction, the second insertion portion being inserted into the annular space and sealed to the water connector;

[0037] The end of the first insertion part near the fine filtration unit is sealed with the central tube, and the end of the first insertion part away from the fine filtration unit is sealed with the water flow guiding assembly.

[0038] Preferably, the outer wall of the second insertion part is sealed to the inner wall of the first insertion part by a fourth sealing structure.

[0039] Preferably, the water flow guiding assembly includes a first cover and a first sealing structure between the first cover and the water connector; a first extension of the first cover is sleeved outside the first insertion portion; the outer side wall of the end of the first insertion portion away from the fine filtration unit is sealed with the inner side wall of the first extension of the first cover through the first sealing structure.

[0040] Preferably, a portion of the first insertion part is inserted into the central tube, and the outer wall of the end of the first insertion part near the fine filtration unit is sealed to the inner wall of the central tube by a second sealing structure.

[0041] Preferably, a portion of the first insertion part is inserted to the outside of the central tube, and the inner sidewall of the end of the first insertion part near the fine filtration unit is sealed to the outer sidewall of the central tube by a second sealing structure.

[0042] Preferably, the outlet of the post-filtration unit is connected to the annular space, and the annular space forms the inlet of the purified water channel.

[0043] Preferably, in the axial direction, the inlet of the wastewater channel of the water connector is located on the outer wall of the first insertion part between the second sealing structure and the first sealing structure.

[0044] Preferably, a third flow channel extending in the axial direction is formed within the post-filter unit;

[0045] The third body has a connecting hole that communicates with the third flow channel; the third flow channel communicates with the annular space through the connecting hole, and the annular space is the inlet of the water purification channel.

[0046] Preferably, a third flow channel extending in the axial direction is formed within the post-filter unit;

[0047] The post-filter unit is provided with a third cover at the end away from the water inlet. The third cover seals the end of the post-filter unit away from the water inlet, so that the third flow channel is completely isolated from the outer wall of the post-filter unit.

[0048] Preferably, the post-filter unit is a carbon rod.

[0049] Preferably, the end of the central pipe away from the water inlet is closed.

[0050] Preferably, the composite filter element further includes:

[0051] A fourth cover is disposed at the ends of the pre-filter unit and the fine filter unit away from the opening, and the fourth cover blocks the ends of the pre-filter unit and the fine filter unit away from the opening.

[0052] Preferably, the composite filter element further includes:

[0053] The scale inhibitor unit is installed inside the housing. Raw water entering from the inlet of the raw water channel passes through the scale inhibitor unit and then enters the pre-filter unit. The scale inhibitor unit is located between the end of the pre-filter unit facing the opening and the opening.

[0054] Preferably, the housing has an axis, and the opening is located in the axial direction of the housing; in the axial direction, the scale inhibitor unit is located between the end of the fine filter unit facing the opening and the opening.

[0055] Preferably, the scale inhibitor unit extends along the axial direction of the housing and is located on the axial direction of the housing.

[0056] Preferably, the scale inhibitor unit is disposed within the water inlet.

[0057] Preferably, the scale inhibitor unit is disposed within the raw water channel.

[0058] Preferably, a receiving cavity is formed inside the water connector, the receiving cavity forming part of the raw water channel, and the scale inhibitor unit is disposed inside the receiving cavity.

[0059] Preferably, the receiving cavity is located inside the end of the second body of the water connector facing the fine filtration unit, and the receiving cavity extends along the axial direction of the housing.

[0060] Preferably, the receiving cavity is provided with a partition, which causes the portion of the raw water channel formed in the receiving cavity to have a curved structure.

[0061] Preferably, the partition extends vertically, and the inlet and outlet of the receiving cavity are located at the end of the water connector opposite to the fine filtration unit.

[0062] Preferably, the water connector includes a second body and a sealing cap, the receiving cavity is formed on the second body, and the sealing cap is provided at one end of the receiving cavity facing the fine filtration unit. The sealing cap is connected to the second body by spin welding.

[0063] Preferably, the inlet of the receiving cavity has a grid structure that retains the scale inhibitor unit within the receiving cavity;

[0064] And / or,

[0065] The outlet of the receiving cavity has a grid structure that keeps the scale inhibitor unit within the receiving cavity.

[0066] Preferably, the receiving cavity is arranged in parallel with a portion of the clean water channel and a portion of the wastewater channel in the second body of the water connector.

[0067] Preferably, when the pre-filter unit includes a PP cotton filter unit, the PP cotton filter unit is arranged around the outer wall of the fine filter unit.

[0068] Preferably, the water connector is installed at the opening of the housing in a detachable manner by insertion or knob.

[0069] Preferably, the composite filter element further includes:

[0070] A post-filter unit is installed on the water connector, with the central tube sleeved outside the post-filter unit and the water connector inserted inside the central tube, so that the water connector with the post-filter unit installed can be detachably installed at the opening of the housing or removed from the opening of the housing.

[0071] Preferably, the fine filtration unit includes at least one of the following: a reverse osmosis membrane filtration unit, a nanofiltration membrane filtration unit, and an ultrafiltration membrane filtration unit.

[0072] Preferably, the housing includes a first housing and a second housing, one of the first housing and the second housing having a recess and the other having a protrusion, the recess and the protrusion cooperating and connected by spin welding.

[0073] A water purification device, the water purification device comprising a composite filter element as described in any of the above descriptions.

[0074] The technical solution of the present invention has the following significant beneficial effects:

[0075] In this application, the composite filter element utilizes a water flow guiding component to guide the raw water input from the raw water channel of the water connector to the first flow channel and then into the pre-filter unit, and also to guide the wastewater generated after filtration by the fine filtration unit to the wastewater channel of the water connector. This achieves two functions, thereby optimizing the structure of the composite filter element and making it more streamlined. By minimizing the number of internal components of the composite filter element, the wastewater generated by the fine filtration unit can be discharged through the water connector. This reduces the cost of the composite filter element and reduces the number of assembly steps, which helps to improve production efficiency.

[0076] Specific embodiments of the invention are disclosed in detail below with reference to the description and accompanying drawings, indicating how the principles of the invention can be employed. It should be understood that the embodiments of the invention are not therefore limited in scope. Features described and / or shown for one embodiment may be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments, or substituted for features in other embodiments. Attached Figure Description

[0077] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of the invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely illustrative to aid in understanding the invention and do not specifically limit the shapes and proportions of the components. Those skilled in the art, guided by the teachings of this invention, can select various possible shapes and proportions to implement the invention according to specific circumstances.

[0078] Figure 1 This is a schematic cross-sectional view of the composite filter element in an embodiment of the present invention;

[0079] Figure 2 This is a partially enlarged schematic diagram of the composite filter element in an embodiment of the present invention;

[0080] Figure 3 This is a partial three-dimensional schematic diagram of the composite filter element in an embodiment of the present invention;

[0081] Figure 4 This is a cross-sectional view of the first cover in an embodiment of the present invention;

[0082] Figure 5 This is a top view of the first cover in an embodiment of the present invention;

[0083] Figure 6 This is a three-dimensional structural diagram of the first cover in an embodiment of the present invention;

[0084] Figure 7 for Figure 1 Enlarged view of the connection point I between the first and second shells in the middle shell;

[0085] Figure 8 This is a three-dimensional structural diagram of the water connector in an embodiment of the present invention;

[0086] Figure 9 This is a top view of the water connector in an embodiment of the present invention;

[0087] Figure 10 for Figure 9 Cross-sectional view at point CC;

[0088] Figure 11 for Figure 9 Cross-sectional view at point DD;

[0089] Figure 12 for Figure 9 Cross-sectional view at the EE section;

[0090] Figure 13 This is a schematic diagram of the structure of the central tube in an embodiment of the present invention.

[0091] The reference numerals in the above figures are as follows:

[0092] 1. Pre-filter unit; 2. Fine filter unit; 3. Post-filter unit; 31. Third flow channel; 4. Housing; 41. First housing; 42. Second housing; 43. Opening; 5. Water connector; 51. Raw water channel; 511. Receiving cavity; 512. Grille structure; 52. Clean water channel; 521. Annular space; 53. Wastewater channel; 54. Second body; 55. First insertion part; 56. Partition part; 57. Sealing cover; 6. Central tube; 61. Through hole; 7. Water flow guiding assembly; 71. First cover; 711. First body; 712. First extension; 713. First step; 714. Groove; 715. Second step; 716. Reinforcing part; 717. Reinforcing rib; 718. Second extension; 719. Protrusion; 72. First sealing structure; 8. First flow channel; 9. Second flow channel; 10. Second sealing structure; 11. Third sealing structure; 12. Fourth sealing structure; 13. Second cover; 131. Third body; 1311. Connecting hole; 132. Second insertion part; 14. Third cover; 15. Fourth cover; 16. Scale inhibitor unit. Detailed Implementation

[0093] The details of the present invention can be more clearly understood by referring to the accompanying drawings and the description of specific embodiments. However, the specific embodiments of the present invention described herein are for illustrative purposes only and should not be construed as limiting the invention in any way. Under the teachings of this invention, those skilled in the art can conceive of any possible modifications based on the invention, all of which should be considered within the scope of the invention. It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or there may be an intervening element. The terms "mounted," "connected," and "connected" should be interpreted broadly, for example, they can refer to mechanical or electrical connections, or internal communication between two elements, and can be direct or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0094] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0095] In order to guide raw water to the inlet of the pre-filter unit and simultaneously guide wastewater from the fine filter unit to the water outlet while maintaining a simple structure, a composite filter element is proposed in this application. Figure 1 This is a schematic cross-sectional view of the composite filter element in an embodiment of the present invention. Figure 2 This is a partially enlarged schematic diagram of the composite filter element in an embodiment of the present invention. Figure 3 This is a partial three-dimensional schematic diagram of the composite filter element in an embodiment of the present invention. Figure 8 This is a three-dimensional structural diagram of the water connector in an embodiment of the present invention. Figure 9 This is a top view of the water connector in an embodiment of the present invention. Figure 10 for Figure 9 Cross-sectional view at point CC. Figure 11 for Figure 9 Cross-sectional view at point DD. Figure 12 for Figure 9 Cross-sectional view at EE. Figure 13 This is a schematic diagram of the structure of the central tube in an embodiment of the present invention, as shown below. Figures 1 to 3 , Figures 8 to 13As shown, the composite filter element may include: a housing 4, a water connector 5, a pre-filter unit 1, a fine filter unit 2, a central tube 6, and a water flow guiding component 7. The housing 4 houses the pre-filter unit 1, the fine filter unit 2, the central tube 6, and the water flow guiding component 7. One end of the housing 4 has an opening 43, at which the water connector 5 is located. The water connector 5 is used to connect with the water interface on the water circuit board of the water purification device. The opening 43 of the housing 4 can be detachably connected to the water circuit board via rotation or insertion. The water connector 5 can also be detachably installed at the opening 43 of the housing 4 via insertion or rotation. The water connector 5 contains a raw water channel 51, a purified water channel 52, and a wastewater channel 53. The raw water channel 51 is used to input raw water into the housing 4, the purified water channel 52 is used to export the purified water formed after filtration by the pre-filter unit 1 and the fine filter unit 2 to the outside of the housing 4, and the wastewater channel 53 is used to export the wastewater formed during filtration by the fine filter unit 2 to the outside of the housing 4.

[0096] In order to accommodate larger components such as the pre-filter unit 1, the fine filter unit 2, and the water flow guiding assembly 7 within the housing 4, as a feasible approach, Figure 7 for Figure 1 An enlarged view of the connection point I between the first and second shells in the middle shell, as shown below. Figures 1 to 3 and Figure 7 As shown, the housing 4 may include a first housing 41 and a second housing 42. For example, along the axial direction of the housing 4, the first housing 41 may be the upper half near the opening 43, and the second housing 42 may be the lower half away from the opening 43. One of the first housing 41 and the second housing 42 has a recess, and the other has a protrusion. The recess and the protrusion mate and are connected by spin welding. In this way, larger components such as the pre-filter unit 1, the fine filter unit 2, and the water flow guiding assembly 7 can be installed into the second housing 42 first, and then the first housing 41 can be connected to the second housing 42 by spin welding, thereby forming a complete housing 4.

[0097] like Figure 1As shown, the pre-filter unit 1, the fine filter unit 2, the central tube 6, and the water flow guiding assembly 7 are disposed within the housing 4. The pre-filter unit 1 is used for primary filtration of the raw water, removing impurities such as silt, rust, suspended solids, and other small particles, as well as adsorbing odors, discoloration, residual chlorine, and some harmful substances. The pre-filter unit 1 may include at least one of the following: a PP cotton filter unit, an activated carbon filter unit, etc. The fine filter unit 2 is used for further filtration of the water filtered by the pre-filter unit 1, removing smaller particles from the water. The fine filter unit 2 can be any filter unit that needs to discharge wastewater during filtration; for example, the fine filter unit 2 may include at least one of the following: a reverse osmosis membrane filter unit, a nanofiltration membrane filter unit, an ultrafiltration membrane filter unit, etc. When the pre-filter unit 1 includes a PP cotton filter unit, the PP cotton filter unit is wound around the outer wall of the fine filter unit 2. In this way, when manufacturing the pre-filter unit 1, the pre-filter unit 1 can be directly integrated with the fine filter unit 2, and the two become a single component, which facilitates the assembly of the filter element later.

[0098] like Figures 1 to 3 As shown, the fine filtration unit 2 is wound around the central tube 6, and the pre-filtration unit 1 is radially arranged outside the fine filtration unit 2. A first flow channel 8 is formed between the pre-filtration unit 1 and the inner wall of the housing 4. The axial directions of the fine filtration unit 2, the pre-filtration unit 1, and the central tube 6 are the same as the axial direction of the housing 4, all being vertical. A water flow guiding component 7 is used to guide the raw water input from the raw water channel 51 into the first flow channel 8 and to guide the wastewater produced after filtration by the fine filtration unit 2 into the wastewater channel 53. The raw water in the first flow channel 8 can flow radially into the pre-filtration unit 1 for filtration. The filtered water then flows radially into the raw water end of the fine filtration unit 2. The wastewater produced after filtration by the fine filtration unit 2 is discharged from the wastewater end of the fine filtration unit 2, guided by the water flow guiding component 7, and flows into the wastewater channel 53 before being discharged from the housing 4. The purified water produced after filtration by the fine filtration unit 2 flows out from the purified water end of the fine filtration unit 2. The central pipe 6 is connected to the water purification channel 52. The purified water produced after filtration by the fine filtration unit 2 flows into the central pipe 6 and is output through the water purification channel 52.

[0099] In this application, the composite filter element utilizes the water flow guiding component 7 to guide the raw water input from the raw water channel 51 of the water connector 5 to the first flow channel 8 and then into the pre-filter unit 1, and also to guide the wastewater generated after filtration by the fine filter unit 2 to the wastewater channel 53 of the water connector 5. This achieves two functions, thereby optimizing the structure of the composite filter element and making it more streamlined. By minimizing the number of internal components of the composite filter element, the wastewater generated by the fine filter unit 2 can be discharged through the water connector 5. This reduces the cost of the composite filter element and reduces the number of assembly steps, which helps to improve production efficiency.

[0100] As a feasible option, such as Figures 1 to 3 As shown, the water flow guiding assembly 7 may include a first cover 71 and a first sealing structure 72 between the first cover 71 and the water connector 5. The first sealing structure 72 is formed between the outlet of the raw water channel 51 and the inlet of the wastewater channel 53, and can isolate the outlet of the raw water channel 51 and the inlet of the wastewater channel 53 to prevent the raw water and wastewater from mixing. The raw water flowing in from the outlet of the raw water channel 51 is guided from one side of the first cover 71 to the first flow channel 8, where one side of the first cover 71 is the outer side of the first cover 71 facing the housing 4. The wastewater generated after filtration by the fine filtration unit 2 is guided from the other side of the first cover 71 to the inlet of the wastewater channel 53. The other side of the first cover 71 is the inner side of the first cover 71.

[0101] The first cover 71 is installed on the ends of the pre-filter unit 1 and the fine filter unit 2 near the opening 43. The pre-filter unit 1 and the fine filter unit 2 can be generally tubular. The first cover 71 completely seals the end of the pre-filter unit 1 near the opening 43, thereby preventing raw water from entering from the end of the pre-filter unit 1 and preventing water filtered by the pre-filter unit 1 from being discharged from the end, ensuring that the outer wall of the pre-filter unit 1 is the water inlet and the inner wall of the pre-filter unit 1 is the water outlet. The first cover 71 partially seals the end of the fine filter unit 2 near the opening 43, thereby ensuring that the wastewater produced after filtration by the fine filter unit 2 can be discharged from the unsealed part of the end of the fine filter unit 2.

[0102] The first cover 71 has a notch in the middle to allow the water connector 5 to be inserted. In order to facilitate the discharge of wastewater generated after filtration by the fine filter unit 2 from the unsealed end of the fine filter unit 2, it is directly guided into the wastewater channel 53 of the water connector 5 by the action of the first cover 71, without the need for other parts to form a channel. The sealed part of the end of the fine filter unit 2 near the opening 43 is located on the side near the pre-filter unit 1.

[0103] As a feasible option, Figure 4 This is a cross-sectional view of the first cover in an embodiment of the present invention. Figure 5 This is a top view of the first cover in an embodiment of the present invention. Figure 6 This is a three-dimensional structural diagram of the first cover in an embodiment of the present invention, as shown below. Figures 4 to 6 As shown, the first cover 71 may include a first body 711 extending radially and a first extension 712 extending axially inside the first body 711. The radial cross-section of the first extension 712 is annular, thus forming a notch. The first body 711 completely seals the end of the pre-filter unit 1 near the opening 43 with sealing material and partially seals the end of the fine filter unit 2 near the opening 43 with sealing material. A first sealing structure 72 is provided between the inner wall of the first extension 712 and the outer wall of the water connector 5. The first sealing structure 72 is used to seal between the inner wall of the first extension 712 and the outer wall of the water connector 5. For example, the sealing structure may include an annular groove opened on the inner wall of the first extension 712 or the outer wall of the water connector 5 and a sealing ring disposed in the groove 714. Of course, the sealing structure may also adopt other structures, and no limitation is made on them in this application. The sealing material may include a sealant, which is used to bond the first cover 71 to the ends of the pre-filter unit 1 and the fine filter unit 2, while also achieving a sealing effect.

[0104] As a feasible option, such as Figure 4 and Figure 6 As shown, the first body 711 has a groove 714 on its end face facing the pre-filter unit 1 and the fine filter unit 2, which can accommodate sealing material. During the process of installing the first cover 71 to the ends of the pre-filter unit 1 and the fine filter unit 2, sealant is applied to the ends of the pre-filter unit 1 and the fine filter unit 2, and then the first cover 71 is installed to the ends of the pre-filter unit 1 and the fine filter unit 2. At this time, the excess sealant at the ends of the pre-filter unit 1 and the fine filter unit 2 can flow into the groove 714. This can prevent the sealant from overflowing to the ends of the fine filter unit 2 where sealing is not required, and at the same time, it can make the first cover 71 fit more tightly with the pre-filter unit 1 and the fine filter unit 2, reducing the axial dimension after assembly.

[0105] Furthermore, such as Figure 4As shown, the end face of the first body 711 facing away from the pre-filter unit 1 and the fine filter unit 2 has a first step portion 713 at the connection with the first extension portion 712. The first body 711 and the first step portion 713 form a groove 714. Since the groove 714 needs to have sufficient depth to accommodate more sealing material, although making the first body 711 thick enough can achieve the above-mentioned sealing, it will waste the material of the first body 711 and cause the assembled pre-filter unit 1, fine filter unit 2 and first cover 71 to be too large in the axial dimension. By using the first step portion 713, the thickness of the other parts of the first body 711 can be greatly reduced, saving manufacturing costs, while forming a groove 714 with a large depth to accommodate more sealing material.

[0106] As a feasible option, such as Figures 1 to 3 As shown, the lower end of the water connector 5 is inserted into the first extension 712. A second flow channel 9 is formed between the inner wall of the first extension 712, the outer wall of the water connector 5, and the first sealing structure 72. The second flow channel 9 connects the wastewater end of the fine filtration unit 2 and the inlet of the wastewater channel 53. That is, the wastewater flowing out from the end of the fine filtration unit 2 near the water connector 5 flows into the inlet of the wastewater channel 53 through the second flow channel 9.

[0107] As a feasible option, such as Figures 1 to 3 As shown, a second sealing structure 10 is provided between the water connector 5 and the central pipe 6, which isolates the second flow channel 9 from the interior of the central pipe 6. This prevents wastewater in the second flow channel 9 from mixing with the clean water inside the central pipe 6.

[0108] For example, such as Figures 1 to 3 , Figures 9 to 12 As shown, the water connector 5 may include a second body 54 and a first insertion portion 55 extending in the axial direction. The first insertion portion 55 is located on the outer wall of the second body 54 at the end facing the fine filtration unit 2. The water purification channel 52 includes an annular space 521 formed between the first insertion portion 55 and the outer wall of the second body 54. Figure 13 This is a schematic diagram of the structure of the central tube in an embodiment of the present invention, as shown below. Figure 13As shown, multiple through holes 61 are provided on the side wall of the central tube 6. The purified water filtered by the inner wall of the fine filtration unit 2 flows into the central tube 6 through the through holes 61 and then into the annular space 521, exiting through the purified water channel 52 to the outside of the housing 4. The inlet of the wastewater channel 53 is located on the outer wall of the first insertion part 55 between the second sealing structure 10 and the first sealing structure 72, ensuring that wastewater in the second flow channel 9 can enter the wastewater channel 53 of the water connector 5. The wastewater channel 53 passes through the outer wall of the first insertion part 55 and at least part of the annular space 521, extending through the second body 54 in a direction away from the fine filtration unit 2. At least part of the purified water channel 52, excluding the annular space 521, is located in the second body 54 and extends along the axial direction of the water connector 5. The outlets of the wastewater channel 53 and the purified water channel 52 are located at the end of the water connector 5 away from the fine filtration unit 2.

[0109] As a feasible option, such as Figure 4 As shown, the inner wall of the first extension 712 may have a second stepped portion 715. The inner wall of the first extension 712 has a plurality of reinforcing portions 716 distributed radially and circumferentially. The inner wall of the reinforcing portion 716 can abut against the outer wall of the central tube 6 to limit the central tube 6 in the radial direction, thereby fixing the first cover 71 and the central tube 6 in the radial direction. In addition, the reinforcing portion 716 can also strengthen the first extension 712 and prevent it from deforming or breaking due to compression by the sealing material. Of course, a second flow channel 9 is formed between adjacent reinforcing portions 716.

[0110] As a feasible option, such as Figure 2 and Figure 4 As shown, the inner diameter of the second stepped portion 715 of the inner wall of the first extension 712 facing the fine filter unit 2 is larger than the inner diameter of the second stepped portion 715 of the inner wall of the first extension 712 facing the opening 43. A reinforcing portion 716 can be located on the side of the second stepped portion 715 of the inner wall of the first extension 712 facing the fine filter unit 2. With the above structure, the side of the second stepped portion 715 of the inner wall of the first extension 712 facing the opening 43 can be used to provide the first sealing structure 72.

[0111] As a feasible option, such as Figure 4As shown, in the radial direction, the groove 714 is located on the outer periphery of the first extension 712 and is close to the first extension 712. The first extension 712 extends axially to the end face of the fine filter unit 2 and abuts against it to block the sealing material and allow part of the sealing material between the first body 711 and the fine filter unit 2 to enter the groove 714. The first extension 712 can extend downward beyond the lower end face of the first body 711 in the axial direction. Since the first extension 712 can abut against the end face of the fine filter unit 2, it can be ensured that during the process of installing the first cover 71 to the ends of the pre-filter unit 1 and the fine filter unit 2, when the first cover 71 squeezes the sealing material, the sealing material cannot pass through the first extension 712 to the end of the fine filter unit 2 where sealing is not required, and the sealing material will be blocked from entering the groove 714. This effectively improves the yield rate after the first cover 71 is assembled with the pre-filter unit 1 and the fine filter unit 2, and can also improve production efficiency to a certain extent.

[0112] As is feasible, due to the presence of the first step portion 713, the thickness of the first body 711 can be made relatively thin, therefore, as Figure 4 As shown, the end face of the first body 711 facing away from the front-mounted filter unit 1 may have reinforcing ribs 717, thereby improving the strength of the first cover 71. Furthermore, there are multiple reinforcing ribs 717, with at least some of them arranged in parallel. This structure effectively improves the yield rate of the first cover 71 upon demolding, facilitating the processing and manufacturing of the first cover 71. In addition, some reinforcing ribs 717 connect to adjacent parallel reinforcing ribs 717 to further enhance the strength of the first cover 71.

[0113] As a feasible option, such as Figure 4 and Figure 6 As shown, the first cover 71 may include a second extension 718 extending axially from the outer side of the first body 711, and the second extension 718 is sleeved on the pre-filter unit 1. Sealing material overflowing between the first body 711 of the first cover 71 and the pre-filter unit 1 and fine filter unit 2 will enter between the second extension 718 and the side wall of the pre-filter unit 1, thereby ensuring a sufficient seal at the end of the pre-filter unit 1. The outer wall of the second extension 718 has multiple protrusions 719 distributed circumferentially and extending circumferentially along the first cover 71. The protrusions 719 can provide a certain limiting effect, preventing the first cover 71 from tilting excessively. Additionally, the protrusions 719 can guide the flow, dispersing the raw water flowing in from the raw water channel 51 of the water connector 5 into the annular space between the first cover 71 and the housing 4, and then flowing vertically downwards into the first flow channel 8 with an annular cross-section, reducing the degree to which the raw water flows into the first flow channel 8 in a rotating manner.

[0114] In the above embodiment, the wastewater end of the fine filtration unit 2 is located at the end of the fine filtration unit 2 near the opening 43. The outer sidewall of the fine filtration unit 2 is the raw water end. The inner sidewall of the fine filtration unit 2 is the purified water end.

[0115] As a feasible option, such as Figure 1 As shown, the outer wall of the water connector 5 is sealed to the inner wall of the housing 4 by a third sealing structure 11. The third sealing structure 11 is provided at the opening 43 of the housing 4, and prevents water inside the housing 4 from flowing out through the gap between the water connector 5 and the housing 4.

[0116] As a feasible option, such as Figure 2 As shown, the outlet of the raw water channel 51 is located between the third sealing structure 11 and the first sealing structure 72 on the outer wall of the water connector 5, thereby ensuring that the raw water flowing out of the outlet of the raw water channel 51 can be smoothly guided from the first cover 71 side to the first flow channel 8 without interfering with the wastewater in the second flow channel 9. Specifically, the outlet of the raw water channel 51 can be located on the outer wall of the second body 54 of the water connector 5, which is located above the first insertion part 55.

[0117] As a feasible option, such as Figure 1 As shown, the composite filter cartridge may include a post-filtration unit 3 disposed within the central tube 6. The purified water filtered by the fine filtration unit 2 enters the central tube 6, passes through the post-filtration unit 3, and then flows into the purified water channel 52 for output. The post-filtration unit 3 is used to perform functional treatment on the purified water filtered by the fine filtration unit 2; for example, the post-filtration unit 3 may employ an activated carbon filtration unit, which can improve the taste.

[0118] To ensure a high flow rate of purified water from the fine filtration unit 2 through the post-filtration unit 3, the post-filtration unit 3 can be tubular. The axial direction of the post-filtration unit 3 is the same as that of the central tube 6. The post-filtration unit 3 is inserted inside the central tube 6. The outer wall of the post-filtration unit 3 is the inlet, and the inner wall is the outlet. For example, when the post-filtration unit 3 uses an activated carbon filter, it can be a tubular carbon rod.

[0119] As a feasible option, such as Figures 1 to 3 As shown, a second cover 13 is provided at the end of the post-filter unit 3 near the water inlet 5, and a fourth sealing structure 12 is provided between the water inlet 5 and the second cover 13. A third flow channel 31 is formed inside the post-filter unit 3, and the third flow channel 31 can extend in the axial direction. Water filtered by the post-filter unit 3 flows into the purified water channel 52 through the third flow channel 31 and is output. The fourth sealing structure 12 isolates the water inlet end of the post-filter unit 3 from the third flow channel 31.

[0120] As a feasible option, such as Figures 1 to 3 As shown, the second cover 13 includes a third body 131 for sealing the end of the post-filter unit 3 and a second insertion portion 132 extending in the axial direction. The second insertion portion 132 is inserted into the annular space 521 and is sealed to the water connector 5. The third body 131 has a connecting hole 1311 in the middle, which communicates with the third flow channel 31. The third flow channel 31 can communicate with the annular space 521 through the connecting hole 1311, so that water filtered by the post-filter unit 3 enters the annular space 521 through the third flow channel 31 and the through hole, and then exits from the purified water channel 52. The annular space 521 is the inlet of the purified water channel 52. The end of the first insertion portion 55 near the fine filter unit 2 is sealed to the central tube 6, thereby isolating the gap between the second flow channel 9 and the post-filter unit 3 and the central tube 6. The end of the first insertion portion 55 away from the fine filter unit 2 is sealed to the water flow guiding assembly 7. The above method enables the first insertion part 55 to be sealed with the central tube 6 and the water flow guiding component 7 at two different positions respectively.

[0121] Regarding the location of the fourth sealing structure 12, such as Figures 1 to 3 As shown, the outer wall of the second insertion part 132 can be sealed to the inner wall of the first insertion part 55 through the fourth sealing structure 12. Therefore, the water outlet of the post-filter unit 3 can communicate with the annular space 521, and the annular space 521 forms the inlet of the purified water channel 52.

[0122] Regarding the location of the first sealing structure 72, such as Figures 1 to 3 As shown, the first extension 712 of the first cover 71 can be sleeved outside the first insertion part 55, and the outer side wall of the end of the first insertion part 55 away from the fine filter unit 2 is sealed with the inner side wall of the first extension 712 of the first cover 71 by the first sealing structure 72.

[0123] Regarding the location of the second sealing structure 10, in one feasible implementation, such as Figures 1 to 3 As shown, a portion of the first insertion part 55 is inserted into the central tube 6, and the outer side wall of the first insertion part 55 near the fine filter unit 2 is sealed to the inner side wall of the central tube 6 by the second sealing structure 10. In another feasible embodiment, a portion of the first insertion part 55 is inserted to the outside of the central tube 6, and the inner side wall of the first insertion part 55 near the fine filter unit 2 is sealed to the outer side wall of the central tube 6 by the second sealing structure 10.

[0124] In the two feasible implementation methods described above, in the axial direction, such as Figure 11As shown, the inlet of the wastewater channel 53 of the water connector 5 is located on the outer wall of the first insertion part 55 between the second sealing structure 10 and the first sealing structure 72, thereby ensuring that the wastewater of the second flow channel 9 can enter the wastewater channel 53.

[0125] As a feasible option, such as Figure 1 As shown, a third cover 14 is provided at the end of the post-filter unit 3 away from the water inlet 5. The third cover 14 seals the end of the post-filter unit 3 away from the water inlet 5, and the third cover 14 blocks the lower end of the third flow channel 31, so that the third flow channel 31 is completely isolated from the outer wall of the post-filter unit 3.

[0126] In all the above embodiments, as feasible, such as Figure 1 and Figure 13 As shown, the end of the central pipe 6 away from the water connector 5 is closed.

[0127] In all the above embodiments, as feasible, such as Figure 1 As shown, the composite filter element may include a fourth cover 15, which is disposed at the ends of the pre-filter unit 1 and the fine filter unit 2 away from the opening 43, and seals the ends of the pre-filter unit 1 and the fine filter unit 2 away from the opening 43. Of course, if the lower end of the central tube 6 abuts against the fourth cover 15 to ensure a seal between the two, the end of the central tube 6 away from the water connector 5 may also be unsealed.

[0128] To reduce the rate of fouling formation on the filter membrane of fine filtration unit 2, as a feasible approach, is... Figure 1 and Figure 2 As shown, the composite filter element may include a scale inhibitor unit 16 disposed within the housing 4. Raw water entering from the inlet of the raw water channel 51 passes through the scale inhibitor unit 16 and then enters the pre-filter unit 1. As the raw water flows through the scale inhibitor unit 16, the scale inhibitor unit 16 can release scale inhibitory substances into the raw water.

[0129] Alternatively, the scale inhibitor unit 16 can be located between the end of the pre-filter unit 1 facing the opening 43 and the opening 43. This arrangement of the scale inhibitor unit 16 can significantly reduce the radial dimension of the filter element. Specifically, the housing 4 has an axis, and the opening 43 is located along the axis of the housing 4. In the axial direction, the scale inhibitor unit 16 is located between the end of the fine filter unit 2 facing the opening 43 and the opening 43.

[0130] Furthermore, such as Figures 1 to 3As shown, the scale inhibitor unit 16 extends along the axial direction of the housing 4 and is located on the axial direction of the housing 4. In contrast, at a position away from the axial direction, the space between the end of the fine filter unit 2 facing the opening 43 and the inner wall of the housing 4 is smaller, while the space between the end of the fine filter unit 2 facing the opening 43 and the opening 43 is larger in the axial direction. This allows it to accommodate the larger scale inhibitor unit 16 without increasing the size of the housing 4 in the axial direction, because the opening 43 of the housing 4 itself needs to protrude to allow for detachable connection to the water circuit board via rotation or plug-in.

[0131] As a feasible option, such as Figures 1 to 3 As shown, the scale inhibitor unit 16 can be disposed within the water inlet connector 5. This allows the scale inhibitor unit 16 to be directly accommodated within the water inlet connector 5, eliminating the need for additional components in the filter element to house it. This reduces the number of components in the filter element and facilitates assembly. Furthermore, the scale inhibitor unit 16 can be disposed within the raw water channel 51. Thus, when raw water flows through the raw water channel 51, it will also flow through the scale inhibitor unit 16, thereby carrying scale-inhibiting substances with the raw water.

[0132] Specifically, such as Figures 1 to 3 As shown, a receiving cavity 511 is formed within the water connector 5, forming part of the raw water channel 51. The scale inhibitor unit 16 is disposed within the receiving cavity 511. The receiving cavity 511 is located within the end of the second body 54 of the water connector 5 facing the fine filter unit 2, and extends along the axial direction of the housing 4. The axis of the receiving cavity 511 can be the same as or close to the axis of the post-filter unit 3. The vertical length of the second body 54 forming the receiving cavity 511 can be adjusted, thereby controlling the size of the receiving cavity 511. Since the second body 54 forming the receiving cavity 511 can be inserted into the central tube 6, the vertical length of the second body 54 forming the receiving cavity 511 can be arbitrarily adjusted. When the vertical length of the second body 54 forming the receiving cavity 511 increases significantly, only the length of the post-filter unit 3 needs to be shortened. In this way, the overall length of the filter element in the axial direction does not need to be increased.

[0133] As a feasible option, such as Figures 10 to 12 As shown, the receiving cavity 511 is arranged side by side with part of the clean water channel 52 and part of the wastewater channel 53 in the second body 54 of the water connector 5. That is to say, the part of the channel arranged side by side is specifically the part of the channel that extends in the vertical direction.

[0134] As a feasible option, such as Figures 10 to 12As shown, a baffle 56 is provided inside the receiving cavity 511, which makes part of the raw water channel 51 formed inside the receiving cavity 511 have a curved structure. This can avoid the problem of short circuit when the raw water flows through the receiving cavity 511, ensure the length of the raw water channel 51 in the receiving cavity 511, and ensure that the flowing raw water has sufficient contact with the scale inhibitor unit 16. Furthermore, the baffle 56 extends vertically, so that the inlet and outlet of the receiving cavity 511 are located at the end of the water connector 5 away from the fine filter unit 2. For example, in the receiving cavity 511, the raw water flows from top to bottom, then turns 180 degrees after bypassing the baffle 56, and then flows from bottom to top, returning to the end of the water connector 5 away from the fine filter unit 2. With the above structure, the outlet of the raw water channel 51 can be located on the side wall of the second body 54 above the first insertion part 55.

[0135] To facilitate the filling of the scale inhibitor unit 16 into the receiving cavity 511, such as Figures 10 to 12 As shown, the receiving cavity 511 is formed on the second body 54, and a sealing cover 57 is provided at the end of the receiving cavity 511 facing the fine filter unit 2. The sealing cover 57 is connected to the second body 54 by spin welding. When the sealing cover 57 is not connected to the second body 54, the scale inhibitor unit 16 can be filled into the receiving cavity 511, and then the sealing cover 57 is connected to the second body 54 by spin welding.

[0136] Scale inhibitor unit 16 can be in particulate form, therefore, such as Figure 10 As shown, the inlet of the receiving cavity 511 may have a grid structure 512 that retains the scale inhibitor unit 16 within the receiving cavity 511. The outlet of the receiving cavity 511 may also have a grid structure 512 that retains the scale inhibitor unit 16 within the receiving cavity 511. The grid structure 512 prevents leakage of the scale inhibitor unit 16.

[0137] When the water connector 5 is installed in the opening 43 of the housing 4 in a detachable manner by insertion or rotation, it is feasible, such as Figure 1 and Figure 2As shown, the post-filter unit 3 can be installed on the water connector 5. For example, the end of the post-filter unit 3 is inserted into the annular space 521 of the water connector 5 through the second insertion part 132 of the second cover 13. The water connector 5 can be inserted into the central tube 6. For example, the first insertion part 55 of the water connector 5 is inserted into the central tube 6. Based on the above structure, the water connector 5 with the post-filter unit 3 installed can be detachably installed at the opening 43 of the housing 4 or removed from the opening 43 of the housing 4. That is, the water connector 5 with the post-filter unit 3 installed can be detachably installed at the opening 43 of the housing 4. At this time, the post-filter unit 3 is inserted into the central tube 6 and completes the sealing at the corresponding locations. The water connector 5 with the post-filter unit 3 installed can also be removed from the opening 43 of the housing 4. At this time, the post-filter unit 3 is pulled out from the central tube 6 under the action of the water connector 5. Of course, the maximum diameter of the water connector 5 extending into the housing 4 from the opening 43 cannot exceed the inner diameter of the opening 43. Using the above structure, the post-filter unit 3 can be replaced easily and quickly without opening the housing 4.

[0138] This application also proposes a water purification device, which may include any of the composite filter elements described above. The water purification device may also include a water circuit board, and the opening 43 of the composite filter element housing 4 can be detachably connected to the water circuit board by means of rotation, snap-fit, or plug-in.

[0139] All articles and references disclosed herein, including patent applications and publications, are incorporated herein by reference for various purposes. The term “substantially constitutes…” used to describe a combination should include the identified element, component, part, or step, as well as other elements, components, parts, or steps that do not substantially affect the essential novelty of the combination. The use of the terms “comprising” or “including” to describe combinations of elements, components, parts, or steps herein also contemplates embodiments substantially constituted by such elements, components, parts, or steps. The use of the term “may” herein is intended to indicate that any described attribute “may” include is optional. Multiple elements, components, parts, or steps can be provided by a single integrated element, component, part, or step. Alternatively, a single integrated element, component, part, or step can be divided into multiple separate elements, components, parts, or steps. The disclosure of “a” or “an” used to describe an element, component, part, or step does not imply exclusion of other elements, components, parts, or steps.

[0140] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made according to the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A composite filter element, characterized in that, The composite filter element includes: The housing has an opening at one end, and a water connector is provided at the opening. The water connector has a raw water channel, a clean water channel, and a wastewater channel. The water connector is installed at the opening of the housing in a detachable manner by means of insertion or knob. A pre-filter unit, a fine filter unit, and a central tube are disposed within the housing. The fine filter unit is wound around the outside of the central tube. The pre-filter unit is radially disposed outside the fine filter unit. A first flow channel is formed between the pre-filter unit and the inner wall of the housing. A water flow guiding component is provided, which guides raw water input from the raw water channel into the first flow channel and guides wastewater generated after filtration by the fine filtration unit into the wastewater channel. The water flow guiding component includes a first cover and a first sealing structure between the first cover and the water connector. The first sealing structure is formed between the outlet of the raw water channel and the inlet of the wastewater channel. Raw water flowing in from the outlet of the raw water channel is guided from one side of the first cover into the first flow channel, and wastewater generated after filtration by the fine filtration unit is guided from the other side of the first cover into the wastewater channel inlet. The first cover covers the ends of the pre-filtration unit and the fine filtration unit near the opening. The device includes a first body extending radially and a first extension extending axially from the inner side of the first body. The first body completely seals the end of the pre-filter unit near the opening with a sealing material and partially seals the end of the fine filter unit near the opening with a sealing material. A first sealing structure is provided between the inner wall of the first extension and the outer wall of the water connector. A second flow channel is formed between the inner wall of the first extension, the outer wall of the water connector, and the first sealing structure. The second flow channel connects the wastewater end of the fine filter unit and the inlet of the wastewater channel. A second sealing structure is provided between the water connector and the central pipe, which isolates the second flow channel from the interior of the central pipe. The central pipe is connected to the water purification channel. The purified water produced after filtration by the fine filtration unit flows into the central pipe and is output through the water purification channel. The scale inhibitor unit is disposed within the housing and is located within the raw water channel of the water connector. Raw water entering from the inlet of the raw water channel passes through the scale inhibitor unit and then enters the pre-filter unit. The scale inhibitor unit is located between the end of the pre-filter unit facing the opening and the opening. A post-filter unit is installed on the water connector. The purified water filtered by the fine filter unit enters the central pipe, and after being filtered by the post-filter unit, it flows into the purified water channel for output. The central pipe is sleeved outside the post-filter unit, and the water connector is inserted into the central pipe, so that the water connector with the post-filter unit installed can be detachably installed at the opening of the housing or removed from the opening of the housing.

2. The composite filter element according to claim 1, characterized in that, The portion of the fine filtration unit that is blocked near the opening is located on the side near the pre-filter unit.

3. The composite filter element according to claim 1, characterized in that, The end face of the first body facing the pre-filter unit and the fine filter unit has a groove that can accommodate the sealing material.

4. The composite filter element according to claim 3, characterized in that, The end face of the first body facing away from the pre-filter unit and the fine filter unit has a first step portion at the connection with the first extension portion, and the first body and the first step portion form the groove.

5. The composite filter element according to claim 1, characterized in that, The inner wall of the first extension has a second stepped portion, and the inner wall of the first extension has a plurality of reinforcing portions distributed in a radially extending direction and a circumferential direction. The inner wall of the reinforcing portion abuts against the outer wall of the central tube to limit the central tube in the radial direction. The reinforcing portion is located on the side of the second stepped portion of the inner wall of the first extension facing the fine filtration unit.

6. The composite filter element according to claim 3, characterized in that, In the radial direction, the groove is located on the outer periphery of the first extension and close to the first extension, which extends in the axial direction to the end face of the fine filter unit and abuts against it to block the sealing material and allow a portion of the sealing material between the first body and the fine filter unit to enter the groove.

7. The composite filter element according to claim 1, characterized in that, The end face of the first body facing away from the end of the pre-filter unit has reinforcing ribs.

8. The composite filter element according to claim 7, characterized in that, There are multiple reinforcing ribs, and at least some of the reinforcing ribs are arranged in parallel.

9. The composite filter element according to claim 8, characterized in that, Some of the reinforcing ribs are connected to adjacent parallel reinforcing ribs.

10. The composite filter element according to claim 1, characterized in that, The first cover also includes a second extension extending axially on the outside of the first body, the second extension being sleeved on the pre-filter unit.

11. The composite filter element according to claim 10, characterized in that, The outer wall of the second extension has a plurality of protrusions distributed in the circumferential direction and extending in the circumferential direction of the first cover.

12. The composite filter element according to claim 1, characterized in that, Wastewater flowing from the end of the fine filtration unit near the water connector flows into the inlet of the wastewater channel through the second flow passage.

13. The composite filter element according to claim 1, characterized in that, The water connector includes a second body and a first insertion part extending in the axial direction. The first insertion part is located on the outer wall of the second body at one end facing the fine filtration unit. The water purification channel includes an annular space formed between the first insertion part and the outer wall of the second body. The inlet of the wastewater channel is located on the outer wall of the first insertion part between the second sealing structure and the first sealing structure; The wastewater channel passes through the outer wall of the first insertion part and at least part of the annular space, and then extends through the second body in a direction away from the fine filtration unit; at least part of the purified water channel, excluding the annular space, is disposed in the second body and extends along the axial direction of the water connector.

14. The composite filter element according to claim 1 or 12, characterized in that, The wastewater end of the fine filtration unit is located at the end of the fine filtration unit near the opening; the outer wall of the fine filtration unit is the raw water end; and the inner wall of the fine filtration unit is the purified water end.

15. The composite filter element according to claim 1, characterized in that, The outer wall of the water connector is sealed to the inner wall of the housing by a third sealing structure.

16. The composite filter element according to claim 15, characterized in that, The water flow guiding assembly includes a first cover and a first sealing structure between the first cover and the water connector, the first sealing structure being formed between the outlet of the raw water channel and the inlet of the wastewater channel; the outlet of the raw water channel is located between the third sealing structure on the outer wall of the water connector and the first sealing structure.

17. The composite filter element according to claim 1, characterized in that, The post-filter unit is provided with a second cover at the end near the water inlet, and a fourth sealing structure is provided between the water inlet and the second cover; a third flow channel is formed inside the post-filter unit, and the water filtered by the post-filter unit flows into the purified water channel through the third flow channel for output; the fourth sealing structure isolates the water inlet of the post-filter unit from the third flow channel.

18. The composite filter element according to claim 17, characterized in that, The water connector includes a second body and a first insertion part extending in the axial direction, the first insertion part being located on the outer wall of the second body at one end facing the fine filtration unit; the water purification channel includes an annular space formed between the first insertion part and the outer wall of the second body; The second cover includes a third body for sealing the end of the post-filter unit and a second insertion portion extending in the axial direction, the second insertion portion being inserted into the annular space and sealed to the water connector; The end of the first insertion part near the fine filtration unit is sealed with the central tube, and the end of the first insertion part away from the fine filtration unit is sealed with the water flow guiding assembly.

19. The composite filter element according to claim 18, characterized in that, The outer wall of the second insertion part is sealed to the inner wall of the first insertion part by a fourth sealing structure.

20. The composite filter element according to claim 18, characterized in that, The water flow guiding assembly includes a first cover and a first sealing structure between the first cover and the water connector; a first extension of the first cover is sleeved outside the first insertion part; the outer side wall of the end of the first insertion part away from the fine filtration unit is sealed with the inner side wall of the first extension of the first cover through the first sealing structure.

21. The composite filter element according to claim 20, characterized in that, Part of the first insertion part is inserted into the central tube, and the outer side wall of the end of the first insertion part near the fine filtration unit is sealed with the inner side wall of the central tube by a second sealing structure.

22. The composite filter element according to claim 20, characterized in that, Part of the first insertion part is inserted to the outside of the central tube, and the inner side wall of the end of the first insertion part near the fine filtration unit is sealed with the outer side wall of the central tube by a second sealing structure.

23. The composite filter element according to claim 19, characterized in that, The outlet of the post-filtration unit is connected to the annular space, which forms the inlet of the purified water channel.

24. The composite filter element according to claim 21 or 22, characterized in that, In the axial direction, the inlet of the wastewater channel of the water connector is located on the outer wall of the first insertion part between the second sealing structure and the first sealing structure.

25. The composite filter element according to claim 19, characterized in that, The post-filter unit has a third flow channel extending in the axial direction. The third body has a connecting hole that communicates with the third flow channel; the third flow channel communicates with the annular space through the connecting hole, and the annular space is the inlet of the water purification channel.

26. The composite filter element according to claim 1, characterized in that, The post-filter unit has a third flow channel extending in the axial direction. The post-filter unit is provided with a third cover at the end away from the water inlet. The third cover seals the end of the post-filter unit away from the water inlet, so that the third flow channel is completely isolated from the outer wall of the post-filter unit.

27. The composite filter element according to claim 1, characterized in that, The post-filter unit is a carbon rod.

28. The composite filter element according to claim 1, characterized in that, The end of the central pipe furthest from the water inlet is closed.

29. The composite filter element according to claim 1, characterized in that, The composite filter element also includes: A fourth cover is disposed at the ends of the pre-filter unit and the fine filter unit away from the opening, and the fourth cover blocks the ends of the pre-filter unit and the fine filter unit away from the opening.

30. The composite filter element according to claim 1, characterized in that, The housing has an axis, and the opening is located in the axial direction of the housing; in the axial direction, the scale inhibitor unit is located between the end of the fine filter unit facing the opening and the opening.

31. The composite filter element according to claim 30, characterized in that, The scale inhibitor unit extends along the axial direction of the housing and is located on the axial direction of the housing.

32. The composite filter element according to claim 1, characterized in that, A receiving cavity is formed inside the water connector, and the receiving cavity forms part of the raw water channel. The scale inhibitor unit is disposed inside the receiving cavity.

33. The composite filter element according to claim 32, characterized in that, The receiving cavity is located inside the end of the second body of the water connector facing the fine filtration unit, and the receiving cavity extends along the axial direction of the housing.

34. The composite filter element according to claim 32, characterized in that, The cavity is provided with a baffle, which causes the portion of the original water channel formed in the cavity to have a curved structure.

35. The composite filter element according to claim 34, characterized in that, The partition extends vertically, and the inlet and outlet of the receiving cavity are located at the end of the water connector opposite to the fine filtration unit.

36. The composite filter element according to claim 34, characterized in that, The water connector includes a second body and a cover. The receiving cavity is opened on the second body. A sealing cover is provided at one end of the receiving cavity facing the fine filtration unit. The sealing cover is connected to the second body by spin welding.

37. The composite filter element according to claim 32, characterized in that, The inlet of the receiving cavity has a grid structure that keeps the scale inhibitor unit in the receiving cavity; And / or, The outlet of the receiving cavity has a grid structure that keeps the scale inhibitor unit within the receiving cavity.

38. The composite filter element according to claim 32, characterized in that, The receiving cavity is arranged in parallel with part of the clean water channel and part of the wastewater channel in the second body of the water connector.

39. The composite filter element according to claim 1, characterized in that, When the pre-filter unit includes a PP cotton filter unit, the PP cotton filter unit is arranged around the outer wall of the fine filter unit.

40. The composite filter element according to claim 1, characterized in that, The fine filtration unit includes at least one of the following: a reverse osmosis membrane filtration unit, a nanofiltration membrane filtration unit, or an ultrafiltration membrane filtration unit.

41. The composite filter element according to claim 1, characterized in that, The housing includes a first housing and a second housing, one of which has a recess and the other has a protrusion. The recess and the protrusion are fitted together and connected by spin welding.

42. A water purification device, characterized in that, The water purification device includes a composite filter element as described in any one of claims 1 to 41.

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