Composite filter element and water treatment system

Abstract

This invention discloses a composite filter element and a water treatment system. The composite filter element includes: a filter bottle with an internal receiving cavity; a main treatment filter element disposed within the receiving cavity, the main treatment filter element including a central tube assembly and a filter membrane wound on the central tube assembly, the central tube assembly having an upper chamber and a lower chamber isolated from each other along its axial direction; a pretreatment filter element disposed within the lower chamber; and a post-treatment filter element disposed within the upper chamber. This invention effectively utilizes the internal space of the composite filter element to rationally arrange multiple filter elements, making the internal structure of the composite filter element more compact and the product more integrated and miniaturized.

Description

Technical Field

[0001] This invention relates to the field of water treatment technology, specifically to a composite filter element and a water treatment system. Background Technology

[0002] In the water purifier industry, traditional water purifiers typically use multiple filter stages to purify water. A typical water purification system is a three-stage filtration system, consisting of a pretreatment filter, a reverse osmosis or nanofiltration membrane filter, and a post-treatment filter. Traditional three-stage filters are three independent filters connected sequentially via external piping or an integrated water circuit board. With technological advancements, the industry has seen the emergence of water purification systems that integrate the pretreatment and post-treatment filters into a single composite filter, which is then connected to the reverse osmosis or nanofiltration membrane filter via external piping or an integrated water circuit board. This type of system has more complex piping connections, is inconvenient to install and replace, and the numerous joints often lead to a higher risk of leaks.

[0003] More importantly, with the emergence and popularization of integrated water purification and heating products, higher requirements have been placed on the size of the products. Integrating heating systems into traditional water purifiers, especially those using multiple conventional filter cartridges, will pose a significant challenge to the size of the products. Therefore, more integrated and miniaturized purification systems have become a new development trend. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention proposes a composite filter element and water treatment system. The composite filter element has a compact internal structure, is more integrated, and has a smaller overall size.

[0005] To achieve the above objectives, the composite filter element of the present invention includes a filter bottle having an internal receiving cavity; a main treatment filter element disposed within the receiving cavity, the main treatment filter element including a central tube assembly and a filter membrane wound on the central tube assembly, the central tube assembly having an upper chamber and a lower chamber isolated from each other along its axial direction; a pretreatment filter element disposed within the lower chamber; and a posttreatment filter element disposed within the upper chamber.

[0006] In one embodiment, the upper end of the filter bottle has a filter bottle cap, which has a raw water inlet, a pure water outlet, and a wastewater outlet. The post-treatment filter cartridge is closer to the filter bottle cap than the pre-treatment filter cartridge.

[0007] In one embodiment, a raw water inlet channel is formed between the inner wall of the filter bottle and the outer side of the main treatment filter element. The upper end of the raw water inlet channel is connected to the raw water inlet, and the lower end of the raw water inlet channel leads to the pretreatment filter element.

[0008] In one embodiment, the inlet and outlet of the pretreatment filter element are located at the same end, and at the end of the composite filter element away from the filter bottle cap.

[0009] In one embodiment, the outlet of the pretreatment filter cartridge is connected to the inlet of the main treatment filter cartridge, and both are located at the same end of the composite filter cartridge.

[0010] In one embodiment, the main treatment filter element has a wastewater outlet opposite to the inlet end, the wastewater outlet being close to the filter bottle cap and connected to the wastewater outlet.

[0011] In one embodiment, the central tube assembly of the main treatment filter cartridge is connected to the upper chamber where the post-treatment filter cartridge is located at one end near the post-treatment filter cartridge, so that pure water inside the filter membrane can enter the upper chamber.

[0012] In one embodiment, the central tube assembly includes a central tube and a tube end cap, the tube end cap being sleeved on one end of the central tube, and the outer peripheral wall of the tube end cap and the outer peripheral wall of the central tube together forming a winding support surface for the filter membrane to be wound.

[0013] In one embodiment, the central tube has a partition inside to separate the upper chamber and the lower chamber. The partition, the upper part of the central tube, and the tube end cap together form a relatively closed upper chamber for accommodating the post-filter cartridge.

[0014] In one embodiment, the central tube and the tube end cap together form a water passage connecting the main filter element and the upper chamber at their connection.

[0015] In one embodiment, the filter membrane is wrapped around the outer wall of the central tube and at least part of the outer wall of the tube end cap, and the axial extension of the filter membrane on the central tube assembly extends beyond the water passage.

[0016] In one embodiment, the outer circumferential wall of the central tube has a plurality of water collection grooves extending along its axial direction, and in the assembled state, the water collection grooves extend into the tube end cap.

[0017] In one embodiment, the inner wall of the pipe end cap has a number of ribs distributed along its circumference. The ribs are connected to the water collecting ribs that form water collecting grooves on the central pipe. The grooves between the ribs correspond one-to-one with the water collecting grooves that extend into the pipe end cap, together forming a water passage.

[0018] In one embodiment, the central tube has multiple insertion slots at the end that is fitted with the tube end cap, and the inner side wall of the tube end cap is provided with multiple insertion ribs that are inserted into the insertion slots.

[0019] In one embodiment, the pretreatment filter element includes an upper end cap assembly comprising an upper cover body and an upper central tube extending axially from the inner side of the upper cover body; a lower end cap assembly comprising a lower cover body and a lower central tube extending axially from the inner side of the lower cover body; the free end of the upper central tube is connected to the free end of the lower central tube to form a pretreatment central tube; and pretreatment filter material is sleeved or wound on the pretreatment central tube.

[0020] In one embodiment, the lower cover is provided with an inlet for the pretreatment filter cartridge, which is connected to the pretreatment center pipe.

[0021] In one embodiment, the water inlet channel of the pretreatment filter element includes a first water passage, a second water passage, and a third water passage that are interconnected. The first water passage is formed inside the pretreatment central tube, the second water passage is formed between the top of the upper cover and the lower chamber, and the third water passage is formed between the outer side of the pretreatment filter element and the inner wall of the lower chamber.

[0022] In one embodiment, the water outlet channel of the pretreatment filter element is formed between the inner side of the pretreatment filter media and the outer wall of the pretreatment center tube.

[0023] In one embodiment, the outlet of the pretreatment filter element is formed on the lower cover and is distributed circumferentially around the inlet of the pretreatment filter element.

[0024] The present invention also proposes a water treatment system comprising the above-described composite filter element.

[0025] Beneficial effects:

[0026] (1) The present invention effectively utilizes the internal space of the composite filter element, especially the internal space of the central tube assembly, and uses its internal space as the accommodating space for the pre-treatment filter element and the post-treatment filter element, and arranges the two in an axial manner, so that the internal structure of the entire composite filter element is compact and the product is more integrated and miniaturized.

[0027] (2) Based on the above filter element arrangement, the inlet and outlet of each filter element are optimized so that the inlet and outlet of adjacent filter elements are adjacent, thereby making the water path structure between adjacent filter elements simple and the water flow path shorter.

[0028] (3) The main processing filter element of the composite filter element of the present invention uses a central tube assembly to provide a winding bearing surface for the filter membrane. Specifically, the winding bearing surface is composed of the central tube and the tube end cap of the central tube assembly. Therefore, the axial dimension of the filter membrane can be made larger and the filtration area can be larger, thereby improving the filtration efficiency.

[0029] (4) The central tube of the main treatment filter element and the post-treatment filter element share a single end cap. Compared with the prior art, the technical solution of the present invention reduces one end cap and eliminates the commonly used sealing element of the end cap of the post-treatment filter element. Therefore, the internal structure of the composite filter element of the present invention is simpler.

[0030] (5) The pretreatment filter element of the present invention adopts a sleeveable upper end cap assembly and a lower end cap assembly. When the two are sleeved together, they directly form the upper and lower end caps of the pretreatment center tube and the pretreatment filter material. Then, the pretreatment filter material is sleeved or wound to form the pretreatment filter element. The design of this structure makes the pretreatment filter element structure simpler and more integrated. Attached Figure Description

[0031] The invention will now be further described and explained with reference to the accompanying drawings.

[0032] Figure 1 This is a three-dimensional schematic diagram of the composite filter element according to the preferred embodiment of the present invention.

[0033] Figure 2 yes Figure 1 Longitudinal sectional view of the composite filter element.

[0034] Figure 3 This is a three-dimensional schematic diagram of the main treatment filter element.

[0035] Figure 4 This is an exploded view of the main filter element.

[0036] Figure 5 This is a cross-sectional view of the main treatment filter element, in which the internal pretreatment and posttreatment filter elements have been removed.

[0037] Figure 6 This is a three-dimensional schematic diagram of the central tube.

[0038] Figure 7 This is a cross-sectional view of the pipe end cap.

[0039] Figure 8 This is a three-dimensional schematic diagram of the pretreatment filter element.

[0040] Figure 9 This is an exploded view of the pretreatment filter cartridge.

[0041] Figure 10 This is a cross-sectional view of the pretreatment filter cartridge.

[0042] Figure 11 This is a three-dimensional schematic diagram of the lower end cap assembly.

[0043] Figure 12 This is a top view of the lower end cap assembly.

[0044] Figure label:

[0045] 100. Composite filter element; 1. Filter bottle; 2. Pretreatment filter element; 3. Main treatment filter element; 4. Posttreatment filter element; 10. Filter bottle cap; 11. Raw water inlet; 12. Pure water outlet; 13. Wastewater outlet; 20a. First water passage; 20b. Second water passage; 20c. Third water passage; 20d. Outlet channel; 21. Upper end cap assembly; 22. Lower end cap assembly; 23. Pretreatment filter media; 24. Pretreatment center tube; 25a. Pretreatment filter element inlet; 25b. Pretreatment filter element outlet; 30a. Inlet end; 30b. Wastewater outlet end; 31. Center tube assembly; 32. Filter membrane; 33. Membrane upper end cap; 34. Membrane lower end cap; 3 5a. Upper chamber; 35b. Lower chamber; 36. Water passage for central pipe assembly; 40. Post-treatment central pipe; 110. Raw water inlet channel; 200. Rib; 211. Upper cover; 212. Upper central pipe; 213. Upper central hole; 221. Lower cover; 222. Lower central pipe; 223. Lower central hole; 311. Central pipe; 312. Pipe end cap; 3110. Water collection trough; 3111. Water collection rib; 3112. First inclined surface; 3113. Insertion groove; 3114. Smaller diameter end; 3115. Separator; 3120. Groove; 3121. Rib; 3122. Second inclined surface; 3123. Insertion rib; 3125. Pipe end cap outlet; Detailed Implementation

[0046] The technical solution of the present invention will be more clearly and completely explained below with reference to the accompanying drawings and through the description of preferred embodiments of the present invention.

[0047] The present invention discloses a composite filter element comprising: a filter bottle having an internal cavity; a main treatment filter element disposed within the cavity, the main treatment filter element comprising a central tube assembly and a filter membrane wound on the central tube assembly, the central tube assembly having an upper chamber and a lower chamber isolated from each other along its axial direction; a pretreatment filter element disposed within the lower chamber; and a posttreatment filter element disposed within the upper chamber.

[0048] The composite filter element of the present invention integrates the pretreatment filter element, the main treatment filter element, and the posttreatment filter element into one unit, and makes reasonable use of the internal space of the central tube assembly of the main treatment filter element. The pretreatment filter element and the posttreatment filter element are arranged in the central tube assembly in an axial manner, thereby making effective use of the internal space of the composite filter element, resulting in a more compact internal structure, a more integrated product, and a smaller overall size.

[0049] like Figure 1 and Figure 2 As shown, the composite filter element 100 of the present invention includes a filter bottle 1 and a three-stage filter element disposed in the filter bottle 1. The three-stage filter elements are a pretreatment filter element 2, a main treatment filter element 3, and a posttreatment filter element 4.

[0050] The filter bottle 1 has an internal cavity for accommodating the aforementioned three-stage filter cartridges. A filter bottle cap 10 is provided at the upper end of the filter bottle 1. The cap 10 has a raw water inlet 11, a pure water outlet 12, and a wastewater outlet 13. The raw water inlet 11 is connected to the water source to be filtered, such as tap water. The pure water outlet 12 is used to discharge the pure water produced after filtration. The wastewater outlet 13 is used to discharge the high-concentration wastewater generated during the filtration process.

[0051] like Figures 2 to 5 As shown, the main treatment filter element 3 is disposed in the receiving cavity of the filter bottle 1, and includes a central tube assembly 31 and a filter membrane 32, the filter membrane 32 being wound on the central tube assembly 31. The central tube assembly 31 has an upper chamber 35a and a lower chamber 35b that are isolated from each other along its axial direction, which are used to accommodate the post-treatment filter element 4 and the pre-treatment filter element 2, respectively.

[0052] A raw water inlet channel 110 is formed between the outer side of the main treatment filter element 3 and the inner wall of the filter bottle 1. The upper end of the raw water inlet channel 110 is connected to the raw water inlet 11 on the filter bottle cover 10, and the lower end of the raw water inlet channel 110 leads to the pretreatment filter element 2, so that the raw water to be filtered can enter the filter bottle 1 from the raw water inlet 11, pass through the raw water inlet channel 110, and enter the pretreatment filter element 2 for pretreatment.

[0053] The pretreatment filter element 2 has an inlet 25a and an outlet 25b, both located at the same end of the pretreatment filter element 2, and at the same end of the composite filter element 100 as the inlet 30a of the main treatment filter element 3. Furthermore, the outlet 25b is located at the end of the composite filter element 100 furthest from the filter cap 10. This design significantly shortens the water path between the pretreatment filter element 2 and the main treatment filter element 3, making the water flow channel between these two filter stages simpler and the water flow path shorter, thus improving the efficiency of the composite filter element.

[0054] The main treatment filter element 3 has a wastewater outlet 30b opposite to the inlet end 30a, with both located at opposite ends of the filter membrane 32. The wastewater outlet 30b is close to the filter bottle cover 10 and communicates with the wastewater outlet 13 on the filter bottle cover 10, allowing wastewater generated during the water treatment process of the main treatment filter element 2 to be discharged from the wastewater outlet 13. The inner side of the filter membrane 32 of the main treatment filter element 3 is the pure water outlet side, and the pure water flow channel is located between the inner side of the filter membrane 32 and the outer side of the central tube assembly 31.

[0055] The upper end of the central tube assembly 31, that is, the end closest to the post-treatment filter element 4, is connected to the upper chamber 35a where the post-treatment filter element 4 is located, so that the pure water in the pure water flow channel can enter the upper chamber 35a and be post-treated by the post-treatment filter element 4. The outlet of the post-treatment filter element 4 is connected to the pure water outlet 12 on the filter bottle cap 10, and the pure water treated by the post-treatment filter element 4 flows out from the pure water outlet 12.

[0056] In the composite filter element of the present invention, the arrangement of the three-stage filter elements and the design of the water flow channels between each stage of the filter elements make reasonable use of the internal space of the composite filter element and the central tube assembly, making the internal structure of the composite filter element very compact; in addition, the outlet and inlet positions of adjacent filter elements are set adjacently, making the water flow channels very short, improving the filtration efficiency, and further making the overall size of the composite filter element more compact.

[0057] like Figures 2 to 7 As shown, the main treatment filter element 3 includes a central tube assembly 31, a filter membrane 32, an upper membrane cap 33, and a lower membrane cap 34. The filter membrane 32 is wound around the central tube assembly 31, and the upper membrane cap 33 and the lower membrane cap 34 are respectively disposed at the upper and lower ends of the filter membrane 32, thereby forming the main treatment filter element 3.

[0058] The central tube assembly 31 includes a central tube 311 and a tube end cap 312. The tube end cap 312 is fitted onto one end of the central tube 311, and the outer peripheral wall of the tube end cap 312 and the outer peripheral wall of the central tube 311 together form a winding support surface for the filter membrane 32 to be wound. Specifically, the diameter of the central tube 311 is smaller at the end connected to the tube end cap 312, making it easier for the tube end cap 312 to fit onto this smaller diameter end 3114. The inner diameter of the tube end cap 312 is adapted to the smaller diameter end 3114, and the outer diameter of the tube end cap 312 is equal to the maximum outer diameter of the central tube 311. Therefore, when the two are connected, an outer circumferential surface with a uniform outer diameter is formed, which is the winding support surface of the filter membrane 32. Figure 5 As shown, the filter membrane 32 is simultaneously wound around the outer peripheral wall of the central tube 311 and the outer peripheral wall of the tube end cap 312.

[0059] Specifically, the central tube 311 and the tube end cap 312 together form a central tube assembly water passage 36 at their connection point, connecting the main filter element 3 and the upper chamber 35a, allowing pure water in the pure water passage between the filter membrane 32 of the main filter element 3 and the outside of the central tube assembly 31 to enter the upper chamber 35a. The tube end cap 312 has a water outlet 3125, which serves as the water outlet of the post-filter element 4. This water outlet 3125 is connected to the pure water outlet 12 on the filter bottle end cap 10, allowing pure water treated by the post-treatment filter element 4 in the upper chamber 35a to be discharged from the pure water outlet 12.

[0060] Furthermore, the central tube 311 is a tube without holes in its circumferential wall, and has a partition 3115 inside to divide the internal space into an upper chamber 35a and a lower chamber 35b. Preferably, the partition 3110 is integrally designed with the central tube 311. The outer circumferential wall of the central tube 311 has several water collection grooves 3110 extending axially thereon for collecting and guiding pure water flowing out from the inside of the filter membrane 32. The water collection grooves 3110 extend from the larger diameter end to the smaller diameter end of the central tube 311. Therefore, when assembled with the tube end cap 312, the water collection grooves 3110 extend into the tube end cap 312, thus guiding pure water into the tube end cap 312.

[0061] The inner wall of the pipe end cap 312 has several protruding ribs 3121 distributed along its circumference. The ribs 3121 correspond one-to-one with the water collecting ribs 3111 forming the water collecting groove 3110 on the central pipe 311, and are connected one-to-one. The grooves 3120 between the ribs 3121 also correspond one-to-one with the water collecting groove 3110, and are connected and connected to each other to form the water passage 36 mentioned above, thereby guiding the pure water in the water collecting groove 3110 to the pipe end cap 312, and then into the upper chamber 35a.

[0062] Furthermore, the water-collecting rib 3111 has a first inclined surface 3112 at the end that connects with the rib 3121, and correspondingly, the lower end of the rib 3121 has a second inclined surface 3122. When connecting, the lower end face of the rib 3121 abuts against the upper end face of the water-collecting rib 3111, and the first inclined surface 3112 and the second inclined surface 3122 cooperate with each other. Under the guiding effect of the inclined surfaces, the assembly is more convenient.

[0063] The central tube 311 has multiple insertion slots 3113 at the end that fits into the tube end cap 312. These slots are evenly distributed among the water collecting ribs 3111. The inner wall of the tube end cap 312 has multiple protruding insertion ribs 3123, which correspond one-to-one with the insertion slots 3113 and are used to insert into the insertion slots 3113, thereby assembling the tube end cap 312 onto the central tube 311.

[0064] With the end cap 312 assembled to the central tube 311, on the one hand, the upper chamber 35a becomes a relatively closed receiving space for accommodating the post-treatment filter element 4. On the other hand, the outer peripheral wall of the end cap 312 and the outer peripheral wall of the central tube 311 together form a winding bearing surface for the filter membrane 32 to be wound, and the filter membrane 32 extends along its axis on the winding bearing surface beyond the water passage 36 between the main treatment filter element 3 and the upper chamber 35a. This design has several advantages: Firstly, the tube end cap 312 serves as both the upper end cap of the central tube 311 and the post-treatment filter element 4. Compared to existing technologies, this reduces the number of end caps and eliminates the need for the commonly used upper end cap seal of the post-treatment filter element, resulting in a simpler structure. The reduction in parts also increases the internal space of the composite filter element. Secondly, in this invention, the filter membrane 32 has a larger axial dimension and a larger filtration area, effectively improving filtration efficiency. The pure water filtered by the filter membrane 32 can smoothly enter the upper chamber 35a under the guidance of the water passage formed by the water collection tank 3110 and the groove 3120.

[0065] The pure water entering the upper chamber 35a enters from the outside of the post-treatment filter element 4, and after being filtered by the post-treatment filter element 4, it flows out from the post-treatment central pipe 40. The outlet of the post-treatment central pipe 40 is connected to the outlet 3125 of the pipe end cap 312, so that the pure water filtered by the post-treatment filter element 4 passes through the outlet 3125 of the pipe end cap and flows out from the pure water outlet 12 on the filter bottle end cap 10.

[0066] In this invention, the post-treatment filter element 4 is preferably made of activated carbon material, such as granular activated carbon, sintered activated carbon rods, or activated carbon fiber rods, or a composite of several materials. The filter membrane 32 is preferably a reverse osmosis membrane or a nanofiltration membrane.

[0067] like Figures 8 to 12 As shown, the pretreatment filter element 2 of the present invention includes an upper end cap assembly 21, a lower end cap assembly 22, and a pretreatment filter material 23. After the upper end cap assembly 21 and the lower end cap assembly 22 are assembled, they form a support frame for the pretreatment filter element 2. The pretreatment filter material 23 is sleeved or wound on the support frame to form the pretreatment filter element 2.

[0068] The upper end cap assembly 21 includes an upper cover body 211 and an upper central tube 212. One end of the upper central tube 212 is connected to the upper cover body 211 and extends axially from the inner side of the upper cover body 211. The upper end cap assembly 21 has an upper central hole 213 that extends from the upper central tube 212 to the upper cover body 211 and penetrates through the upper cover body 211. The lower end cap assembly 22 includes a lower cover body 221 and a lower central tube 222. One end of the lower central tube 222 extends axially from the inner side of the lower cover body 221. The lower end cap assembly 22 has a lower central hole 223 that extends from the lower central tube 222 to the lower cover body 221 and penetrates through the lower cover body 221. Both the upper central tube 212 and the lower central tube 222 have axially extending ribs 200 on their outer side walls. These ribs serve to support the pretreatment filter material 23 and guide the water flow. In addition, the ribs 200 on the lower central tube 222 also connect the lower central tube 222 to the lower cover 221.

[0069] The free end of the upper central tube 212 is connected to the free end of the lower central tube 222 to form a complete pretreatment central tube 24, and the upper central hole 213 and the lower central hole 223 are also connected to each other, together forming the central hole of the pretreatment central tube 24. Further, in the illustrated embodiment, the free ends of the upper central tube 212 and the lower central tube 222 are connected to each other by a sleeve connection.

[0070] A water inlet 25a is provided on the outer side of the lower cover 221, which communicates with the lower central hole 223. The water inlet 25a may be part of the lower central tube 222, that is, the lower central tube 222 passes through the lower cover 221, and the part of the lower cover 221 located on the outer side forms the water inlet 25a; alternatively, the water inlet 25a may also be a separate pipe fitting connected to the lower cover 221.

[0071] The outlet 25b of the pretreatment filter element 2 is formed on the lower cover 221 and is evenly distributed around the inlet 25a in the circumferential direction. Therefore, the inlet 25a and the outlet 25b of the pretreatment filter element 2 are located at the same end.

[0072] Preferably, in this embodiment, the upper central tube 212 and the upper cover 211 are designed as a single unit, and the lower central tube 222 and the lower cover 221 are designed as a single unit, so that the upper end cover assembly 21 and the lower end cover assembly 22 are both integral components, thereby improving the integration of product components.

[0073] Based on the above structural configuration, after the pretreatment filter element 2 is installed in the lower chamber 35b of the central tube, it has an inlet channel and an outlet channel. Specifically, the inlet channel of the pretreatment filter element 2 includes a first water passage 20a, a second water passage 20b, and a third water passage 20c that are interconnected. The first water passage 20a is formed inside the pretreatment central tube 24, the second water passage 20b is formed between the upper cover 211 and the top of the lower chamber 35b, and the third water passage 20c is formed between the outer side of the pretreatment filter material 23 and the inner wall of the lower chamber 35b. The outlet channel 20d of the pretreatment filter element 2 is formed between the inner side of the pretreatment filter material 23 and the outer side of the pretreatment central tube 24.

[0074] During filtration, the raw water to be filtered enters the pretreatment central pipe 24 through the inlet 25a of the pretreatment filter element 2, and passes through the first water passage 20a, the second water passage 20b, and the third water passage 20c in sequence. Then, it enters the filter media from the outside of the pretreatment filter media 23. The filtered water flows out from the inside of the pretreatment filter media 23, and flows out from the outlet 25b through the outlet channel 20d. Then, it flows to the inlet 30a of the main treatment filter element 3 for secondary filtration.

[0075] Preferably, the pretreatment filter material 23 can be PP cotton, carbon fiber, or a composite filter material of PP cotton and carbon fiber.

[0076] The pretreatment filter element structure design of the present invention results in a larger specific surface area, higher adsorption capacity, faster adsorption and desorption speed, and better purification effect for the carbon fiber composite filter element. In addition, the structure design is simple and compact, more integrated, and modular, thereby enabling modular automated assembly and improving production efficiency.

[0077] The present invention also proposes a water treatment system comprising the composite filter element as described above.

[0078] The above-described specific embodiments are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Various modifications, substitutions, and improvements made by those skilled in the art to the technical solutions of the present invention based on the provided textual description and drawings, without departing from the design concept and spirit of the present invention, should all fall within the scope of protection of the present invention. The scope of protection of the present invention is determined by the claims.

Claims

1. A composite filter element, characterized in that, include: The filter bottle has an internal cavity. The main processing filter element is disposed within the receiving cavity. The main processing filter element includes a central tube assembly and a filter membrane wound on the central tube assembly. The central tube assembly has an upper chamber and a lower chamber that are isolated from each other along its axial direction. A pretreatment filter element is disposed in the lower chamber; The post-treatment filter element is disposed in the upper chamber.

2. The composite filter element according to claim 1, characterized in that, The filter bottle has a filter bottle cap at the top, and the filter bottle cap is provided with a raw water inlet, a pure water outlet, and a wastewater outlet. The post-treatment filter element is closer to the filter bottle cap than the pre-treatment filter element.

3. The composite filter element according to claim 2, characterized in that, A raw water inlet channel is formed between the inner wall of the filter bottle and the outer side of the main treatment filter element. The upper end of the raw water inlet channel is connected to the raw water inlet, and the lower end of the raw water inlet channel leads to the pretreatment filter element.

4. The composite filter element according to claim 3, characterized in that, The inlet and outlet of the pretreatment filter element are located at the same end, and at the end of the composite filter element away from the filter bottle cap.

5. The composite filter element according to claim 4, characterized in that, The outlet of the pretreatment filter element is connected to the inlet of the main treatment filter element, and both are located at the same end of the composite filter element.

6. The composite filter element according to claim 5, characterized in that, The main treatment filter element has a wastewater outlet opposite to the inlet end, the wastewater outlet is close to the filter bottle cap and is connected to the wastewater outlet.

7. The composite filter element according to claim 6, characterized in that, The central tube assembly of the main treatment filter cartridge is connected to the upper chamber where the post-treatment filter cartridge is located at one end near the post-treatment filter cartridge, so that pure water inside the filter membrane can enter the upper chamber.

8. The composite filter element according to claim 7, characterized in that, The central tube assembly includes a central tube and a tube end cap. The tube end cap is sleeved on one end of the central tube, and the outer peripheral wall of the tube end cap and the outer peripheral wall of the central tube together form a winding support surface for the filter membrane to be wound.

9. The composite filter element according to claim 8, characterized in that, The central tube has a partition inside to separate the upper chamber and the lower chamber. The partition, the upper part of the central tube, and the tube end cap together constitute the relatively closed upper chamber for accommodating the post-filter.

10. The composite filter element according to claim 9, characterized in that, The central tube and the tube end cap together form a water passage connecting the main filter element and the upper chamber at their connection point.

11. The composite filter element according to claim 10, characterized in that, The filter membrane is wrapped around the outer wall of the central tube and at least part of the outer wall of the tube end cap, and the axial extension of the filter membrane on the central tube assembly extends beyond the water passage.

12. The composite filter element according to claim 11, characterized in that, The outer circumferential wall of the central tube has several water collection grooves extending along its axial direction. In the assembled state, the water collection grooves extend into the tube end cap.

13. The composite filter element according to claim 12, characterized in that, The inner wall of the pipe end cap has several ribs distributed along its circumference. The ribs are connected to the water collection ribs that form the water collection groove on the central pipe. The grooves between the ribs correspond one-to-one with the water collection grooves that extend into the pipe end cap, together forming the water passage.

14. The composite filter element according to claim 13, characterized in that, The central tube has multiple insertion slots at one end that is fitted with the tube end cap, and the inner wall of the tube end cap is provided with multiple insertion ribs that are inserted into the insertion slots.

15. The composite filter element according to claim 5, characterized in that, The pretreatment filter element includes: An upper cover assembly includes an upper cover body and an upper central tube, the upper central tube extending axially from the inner side of the upper cover body; A lower end cap assembly includes a lower end cap body and a lower central tube, the lower central tube extending axially from the inner side surface of the lower end cap body; The free end of the upper central tube is connected to the free end of the lower central tube to form a pretreatment central tube; Pretreatment filter media, which is sleeved or wound around the pretreatment center tube.

16. The composite filter element according to claim 15, characterized in that, The lower cover is provided with the water inlet of the pretreatment filter element, which is connected to the pretreatment central pipe.

17. The composite filter element according to claim 16, characterized in that, The water inlet channel of the pretreatment filter element includes a first water passage, a second water passage, and a third water passage that are interconnected. The first water passage is formed inside the pretreatment central tube, the second water passage is formed between the top of the upper cover and the lower chamber, and the third water passage is formed between the outer side of the pretreatment filter element and the inner wall of the lower chamber.

18. The composite filter element according to claim 17, characterized in that, The water outlet channel of the pretreatment filter element is formed between the inner side of the pretreatment filter material and the outer wall of the pretreatment center tube.

19. The composite filter element according to claim 18, characterized in that, The outlet of the pretreatment filter element is formed on the lower cover and is distributed circumferentially around the inlet of the pretreatment filter element.

20. A water treatment system, characterized in that, Includes the composite filter element as described in any one of claims 1 to 19.

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