Filter element structure and water purification equipment

Abstract

The utility model discloses a filter element structure and water purification equipment, and relates to the technical field of water purification, the filter element structure comprises a first filter assembly, a second filter assembly and a third filter assembly, raw water is filtered by the first filter assembly to form a first filter fluid, and the first filter fluid is filtered by the second filter assembly to form a second filter fluid; the first filtering fluid is filtered by the second filtering assembly to form second filtering fluid, the second filtering fluid is output to the water storage tank, when water is needed, the second filtering fluid in the water storage tank is input into the third filtering assembly to be filtered, and finally the second filtering fluid is output to water using equipment; according to the filter element structure, the overall filtering degree is improved, meanwhile, it is guaranteed that filtered water stored in the water storage tank can pass through the third filtering assembly, the quality of the filtered water is improved, the taste of the filtered water is improved, and the water use experience of a user is improved.

Description

Technical Field

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

[0002] Water purification equipment is widely used in daily life to eliminate pollution and its impact on water quality from the source and transportation processes, ensuring safe drinking water. In residential water use, different requirements exist for the quality of filtered water depending on the intended use. For example, applications with high water quality requirements (e.g., obtaining direct drinking water after filtration) often require the raw water (e.g., municipal tap water) to undergo a high degree of filtration. To ensure the drinking taste of the direct drinking water, existing composite filter cartridges generally incorporate pre-filtration, reverse osmosis filtration, and post-filtration to form a multi-stage filtration system. However, since the water flow rate of a water purifier is mainly determined by the flux of the reverse osmosis filter layer, for machines with a water tank, to ensure the water flow rate, filtered pure water is generally stored in the tank before being dispensed. However, stored pure water is prone to a decline in taste, reducing the user's drinking experience. Utility Model Content

[0003] The main purpose of this application is to provide a filter cartridge and water purification device, which aims to solve the problem that the drinking taste of stored pure water is easily reduced.

[0004] To achieve the above objectives, the filter element structure proposed in this application includes:

[0005] The first filtration assembly includes a first filter bottle and a first filter element. The first filter element is disposed inside the first filter bottle. A first water inlet channel is formed between the first filter element and the inner wall of the first filter bottle. A first water outlet channel is formed on the side of the first filter element away from the first water inlet channel.

[0006] The second filtration assembly includes a second filter bottle and a second filter element. Both the first filtration assembly and the second filter element are disposed inside the second filter bottle. A second water inlet channel is formed between the inner wall of the second filter bottle and the second filter element. The second water inlet channel is used to communicate with the first water outlet channel through a connector. A wastewater channel is formed inside the second filter element. The second filter element and the side away from the second water inlet channel form a second water outlet channel, which is used to connect to a water storage tank.

[0007] The third filtration assembly includes a third filter bottle, a third filter element, and a central tube. The third filtration assembly is disposed inside the second filter bottle, and both the first filtration assembly and the third filter element are disposed inside the third filter bottle. A third water inlet channel is formed between the inner wall of the third filter bottle and the outer wall of the first filter bottle. A first water passage is formed between the third filter element and the inner wall of the third filter bottle. A second water passage is formed inside the third filter element. One end of the third filter element is connected to one end of the central tube, and the other end of the central tube passes through the first filter element. A first water outlet channel is formed between the first filter element and the central tube. A third water outlet channel is formed inside the central tube and communicates with the second water passage. The third water inlet channel is used to connect to the water storage tank. The first filter element is configured as a pre-filter, the second filter element as a first post-filter, and the third filter element as a second post-filter.

[0008] In one embodiment, the first filter assembly is located above the third filter element. One end of the first filter bottle is provided with a through hole, and one end of the central tube is provided with an abutment portion. The end of the central tube away from the abutment portion passes through the through hole, and the abutment portion abuts against the end of the first filter bottle with the through hole. The abutment portion is connected to one end of the third filter element. The third water outlet channel passes through the abutment portion and communicates with the second water passage channel.

[0009] In one embodiment, the second filter bottle is provided with a first inlet, a first outlet, a second inlet, a second outlet, a wastewater outlet, a third inlet, and a third outlet. The first inlet is connected to the first inlet channel, and the first outlet is connected to the first outlet channel. The second inlet is connected to the second inlet channel, the second outlet is connected to the second outlet channel, and the wastewater outlet is connected to the wastewater channel. The third inlet is connected to the third inlet channel, and the third outlet is connected to the third outlet channel.

[0010] In one embodiment, the second filter bottle includes a bottle body and an end cap. The bottle body has a second opening, and the end cap is connected to the end of the bottle body with the second opening. The first filter assembly, the third filter assembly, and the second filter element are all disposed in the bottle body. The first water inlet, the first water outlet, the second water inlet, and the second water outlet are disposed at the end of the bottle body away from the second opening.

[0011] In one embodiment, the second filter element includes a reverse osmosis membrane, a membrane support, a first filter element cover, and a second filter element cover. The reverse osmosis membrane is wound around the outer surface of the membrane support. The first filter element cover is connected to one end of the reverse osmosis membrane. The inner wall of the bottle has a first extension section extending toward the first filter element cover, and the first filter element cover is sealed to the first extension section. The second filter element cover is connected to one end of the membrane support. The inner wall of the bottle has a second extension section extending toward the second filter element cover. A third water passage is formed between the second extension section and the first extension section. The third water passage is connected to the wastewater passage and the wastewater outlet, respectively. The membrane support has a cavity inside, and the first filter assembly and the third filter assembly are both disposed in the cavity. The side wall of the membrane support has water permeable holes.

[0012] In one embodiment, the third filter bottle has a third opening, and the inner wall of the bottle body has a third extension section facing the third opening, the third opening being sealed to the third extension section; a fourth water passage is formed between the third extension section and the second extension section, the fourth water passage being connected to the second water outlet and the second water outlet respectively.

[0013] In one embodiment, the first filter bottle has a first opening, and the inner wall of the bottle body has a fourth extension section facing the third opening; the first opening is sealed to the fourth extension section; a fifth water passage is formed between the fourth extension section and the third extension section, and the fifth water passage is connected to the third water inlet channel and the third water inlet respectively.

[0014] In one embodiment, the inner wall of the bottle has a fifth extension section facing the first filter element; a sixth water passage is formed between the fifth extension section and the fourth extension section, and the sixth water passage is connected to the first water inlet channel and the first water inlet respectively.

[0015] In one embodiment, the inner wall of the bottle has a sixth extension section facing the central tube, and the end of the central tube is sealed to the sixth extension section; a seventh water passage is formed between the sixth extension section and the fifth extension section, and the seventh water passage is connected to the first water outlet channel and the first water outlet respectively; an eighth water passage is formed in the middle of the sixth extension section, and the eighth water passage is connected to the third water outlet channel and the third water outlet respectively.

[0016] This application also proposes a water purification device, including the filter element structure as described above, and a water storage tank, wherein the inlet end of the water storage tank is connected to the second water outlet channel, and the outlet end of the water storage tank is connected to the third water inlet channel.

[0017] The technical solution of this application forms a multi-stage filtration system by setting a first filter component, a second filter component, and a third filter component in the filter element. Raw water is filtered by the first filter component to form a first filtered fluid. The first filtered fluid is then filtered by the second filter component to form a second filtered fluid. The second filtered fluid is output to a water storage tank. When water is needed, the second filtered fluid in the water storage tank is input to the third filter component for filtration, and finally output to the water-using device. Specifically, raw water enters through the first inlet channel, is filtered by the first filter element to form the first filtered fluid, and can be directly output from the first outlet channel. The connector connects the second outlet end of the first outlet channel to the second inlet channel, allowing the first... The filtered fluid continues to flow from the second outlet of the first outlet channel into the second inlet channel, where it undergoes further filtration by the second filter element to form the second filtered fluid. This second filtered fluid is then output to the storage tank through the second outlet channel. When water is needed, the second filtered fluid in the storage tank flows into the first water passage through the third inlet channel. After further filtration by the third filter element, it forms the third filtered fluid, which flows out through the second water passage channel and finally exits through the third outlet channel to the external water-using equipment. This filter element structure not only improves the overall filtration efficiency but also ensures that the filtered water stored in the storage tank can pass through the post-filter element (third filter component), improving the quality and taste of the filtered water and enhancing the user's water usage experience. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0019] Figure 1 A schematic diagram of an embodiment of the filtering structure provided in this application;

[0020] Figure 2 This is a partial structural diagram of an embodiment of the filtering structure provided in this application.

[0021] Explanation of icon numbers:

[0022] 1. First filter assembly; 11. First filter bottle; 111. Through hole; 12. First filter element; 13. First water inlet channel; 14. First water outlet channel; 2. Second filter assembly; 21. Second filter bottle; 211. Bottle body; 2121. First water inlet; 2122. First water outlet; 2123. Second water inlet; 2124. Second water outlet; 2125. Wastewater outlet; 2126. Third water inlet; 2127. Third water outlet; 212. End cap; 22. Second filter element; 221. Reverse osmosis membrane; 222. Membrane support; 223. First filter element cover; 224. Second filter element cover; 23. Second water inlet channel; 24. Second… 25. Outlet water channel; 3. Wastewater channel; 4. Third filter assembly; 5. Third filter bottle; 6. Third filter element; 7. Central tube; 8. Abutment part; 9. Third inlet water channel; 101. First water passage; 102. Second water passage; 103. Third extension section; 104. Fourth extension section; 105. Fifth extension section; 106. Sixth extension section; 201. Third water passage; 202. Fourth water passage; 203. Fifth water passage; 204. Sixth water passage; 205. Seventh water passage; 206. Eighth water passage.

[0023] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0024] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0025] It should be noted that if the embodiments of this application involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0026] Furthermore, if the embodiments of this application involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0027] Water purification equipment is widely used in daily life to eliminate pollution and its impact on water quality from the source and transportation processes, ensuring safe drinking water. In residential water use, different requirements exist for the quality of filtered water depending on the intended use. For example, applications with high water quality requirements (e.g., obtaining direct drinking water after filtration) often require the raw water (e.g., municipal tap water) to undergo a high degree of filtration. To ensure the drinking taste of the direct drinking water, existing composite filter cartridges generally incorporate pre-filtration, reverse osmosis filtration, and post-filtration to form a multi-stage filtration system. However, since the water flow rate of a water purifier is mainly determined by the flux of the reverse osmosis filter layer, for machines with a water tank, to ensure the water flow rate, filtered pure water is generally stored in the tank before being dispensed. However, stored pure water is prone to a decline in taste, reducing the user's drinking experience.

[0028] To address the aforementioned issues, this application proposes a filter element structure.

[0029] Please see Figures 1 to 2In one embodiment of this application, the filter element structure includes a first filter assembly 1, a second filter assembly 2, and a third filter assembly 3. The first filter assembly 1 includes a first filter bottle 11 and a first filter element 12. The first filter element 12 is disposed inside the first filter bottle 11, and a first water inlet channel 13 is formed between the inner walls of the first filter element 12 and the first filter bottle 11. A first water outlet channel 14 is formed on the side of the first filter element 12 away from the first water inlet channel 13. The second filter assembly 2 includes a second filter bottle 21 and a second filter element 22. Both the first filter assembly 1 and the second filter element 22 are disposed inside the second filter bottle 21. A second water inlet channel 23 is formed between the inner wall of the second filter bottle 21 and the second filter element 22. The second water inlet channel 23 is used to communicate with the first water outlet channel 14 through a connector. A wastewater channel 25 is formed inside the second filter element 22. A second water outlet channel 24 is formed between the second filter element 22 and the side away from the second water inlet channel 23. The second water outlet channel 24 is used to communicate with a water storage tank. The third filter assembly 3 includes a third filter bottle 31, a third filter element 32, and a central tube 33. The third filter assembly 3 is located inside the second filter bottle 21, and both the first filter assembly 1 and the third filter element 32 are located inside the third filter bottle 31. A third water inlet channel 34 is formed between the inner wall of the third filter bottle 31 and the outer wall of the first filter bottle 11. A first water passage channel 35 is formed between the third filter element 32 and the inner wall of the third filter bottle 31. A second water passage channel 36 is formed inside the third filter element 32. One end of the third filter element 32 is connected to one end of the central tube 33, and the other end of the central tube 33 passes through the first filter element 12. A first water outlet channel 14 is formed between the first filter element 12 and the central tube 33. A third water outlet channel 37 is formed inside the central tube 33, and the third water outlet channel 37 is connected to the second water passage channel 36. The third water inlet channel 34 is used for connecting to a water storage tank. The first filter element 12 is set as a pre-filter element, and the second filter element 22 and the third filter element 32 are set as post-filter elements.

[0030] A multi-stage filtration system is formed by setting a first filter assembly 1, a second filter assembly 2, and a third filter assembly 3 in the filter element. Raw water is filtered by the first filter assembly 1 to form a first filtered fluid. This first filtered fluid is then filtered by the second filter assembly 2 to form a second filtered fluid. The second filtered fluid is output to a water storage tank. When water is needed, the second filtered fluid in the water storage tank is input into the third filter assembly 3 for filtration, and finally output to the water-using equipment. Specifically, raw water enters the first filter assembly 1 through the first inlet channel 13, and after being filtered by the first filter element 12, it forms the first filtered fluid, which can be directly output from the first outlet channel 14. A connector connects the first outlet channel 14 to the second inlet channel 23, allowing the first filtered fluid to continue flowing from the first outlet channel 14 into the water-using equipment. The second inlet channel 23 allows the first filtered fluid to pass through the second filter element 22 for further filtration, forming a second filtered fluid. This second filtered fluid is then output to the water storage tank via the second outlet channel 24. When water is needed, the second filtered fluid in the water storage tank is fed into the third inlet channel 34. The second filtered fluid then passes through the first water passage 35 to the third filter element 32. After further filtration by the third filter element 32, the second filtered fluid becomes the third filtered fluid. This third filtered fluid flows out through the second water passage 36 and is finally output to external water-using equipment via the third outlet channel 37. This filter element structure not only improves the overall filtration level but also ensures that the filtered water stored in the water storage tank can pass through the post-filter element (third filter component 3), improving the quality and taste of the filtered water and enhancing the user's water usage experience.

[0031] For example, the first filter element 12 can be a PP cotton layer or a stainless steel filter screen. The second filter element 22 and the third filter element 32 serve as post-filtration. The first filter element 12 can be a reverse osmosis membrane 221 layer. The second filter element 22 can remove dissolved salts, organic matter, bacteria, etc. from the water. The third filter element 32 can be a carbon fiber filter cartridge, which can be made of activated carbon or carbon fiber materials. The third filter element 32 can further remove residual chlorine and odors from the water, thereby further improving water quality, enhancing the taste of the filtered water, and improving the user's water experience.

[0032] In one embodiment, the first filter assembly 1 is located above the third filter element 32. One end of the first filter bottle 11 is provided with a through hole 111, and one end of the central tube 33 is provided with an abutment portion 331. The end of the central tube 33 away from the abutment portion 331 passes through the through hole 111, and the abutment portion 331 abuts against the end of the first filter bottle 11 with the through hole 111. The abutment portion 331 is connected to one end of the third filter element 32. The third water outlet channel 37 passes through the abutment portion 331 and communicates with the second water passage channel 36.

[0033] In the above structure, one end of the central tube 33 is provided with an abutment portion 331, which abuts against the end of the first filter bottle 11 with a through hole 111, enhancing the overall stability and ensuring that the components remain stable when water pressure changes occur inside the filter element structure. The third water outlet channel 37 passes through the abutment portion 331 and communicates with the second water passage channel 36, ensuring that the water flow can smoothly flow into the second water passage channel 36 after being filtered by the third filter element 32, and then be output to the external water-using equipment through the third water outlet channel 37, reducing fluid resistance and improving filtration efficiency.

[0034] In one embodiment, the second filter bottle 21 is provided with a first inlet 2121, a first outlet 2122, a second inlet 2123, a second outlet 2124, a wastewater outlet 2125, a third inlet 2126, and a third outlet 2127. The first inlet 2121 is connected to the first inlet channel 13, and the first outlet 2122 is connected to the first outlet channel 14. The second inlet 2123 is connected to the second inlet channel 23, the second outlet 2124 is connected to the second outlet channel 24, and the wastewater outlet 2125 is connected to the wastewater channel 25. The third inlet 2126 is connected to the third inlet channel 34, and the third outlet 2127 is connected to the third outlet channel 37.

[0035] In the above structure, by setting independent first inlet 2121, first outlet 2122, second inlet 2123, second outlet 2124, wastewater outlet 2125, third inlet 2126 and third outlet 2127, the fluid channels of different filtration stages can be clearly distinguished, ensuring that the fluid flows along the predetermined path. The system comprises the following components: a first inlet 2121 connected to a first inlet channel 13, through which raw water enters for preliminary filtration; a first outlet 2122 connected to a first outlet channel 14, through which the first filtered fluid flows out and into the next filtration stage; a second inlet 2123 connected to a second inlet channel 23, through which the first filtered fluid flows into the second inlet channel 23 for second-stage filtration; and a second outlet 2124 connected to a second outlet channel 24, through which the second filtered fluid flows out and into the next filtration stage. The second outlet 2124 is connected to the inlet of the water storage tank, and the second filtered fluid is used to output to the water storage tank for storage. The third inlet is connected to the outlet of the water storage tank. When water is needed, the second filtered fluid in the water storage tank is input into the third inlet channel 34 through the third inlet. The water flows through the first water passage 35, and after being filtered by the third filter element 32, it forms the third filtered fluid and gathers in the second water passage 36. Finally, the third filtered fluid flows out from the third outlet 2127 through the third outlet channel 37. In addition, the wastewater generated after the first filtered fluid is filtered by the second filter element 22 is discharged from the wastewater outlet 2125. The third outlet 2127 is connected to the water-using equipment.

[0036] In one embodiment, the second filter bottle 21 includes a bottle body 211 and an end cap 212. The bottle body 211 has a second opening, and the end cap 212 is connected to the end of the bottle body 211 with the second opening. The first filter assembly 1, the third filter assembly 3, and the second filter element 22 are all disposed inside the bottle body 211. The first water inlet 2121, the first water outlet 2122, the second water inlet 2123, and the second water outlet 2124 are disposed at the end of the bottle body 211 away from the second opening.

[0037] In the above structure, the bottle body 211 and the end cap 212 form a closed container that can accommodate the second filter element 22, the first filter assembly 1, and the third filter assembly 3, facilitating installation. The first inlet 2121, the first outlet 2122, the second inlet 2123, the second outlet 2124, the wastewater outlet 2125, the third inlet 2126, and the third outlet 2127 are integrated on the bottle body 211, facilitating pipe connection and operation. It should be noted that the bottle body 211 and the end cap 212 are connected by a spin welding process, which can improve the connection stability of the bottle body 211 and the end cap 212, and at the same time facilitate the installation of the first filter assembly 1, the third filter assembly 3, and the second filter element 22 into the bottle body 211.

[0038] In one embodiment, the second filter element 22 includes a reverse osmosis membrane 221, a membrane support 222, a first filter element 12 cover, and a second filter element 22 cover. The reverse osmosis membrane 221 is wound around the outer surface of the membrane support 222. The first filter element 12 cover is connected to one end of the reverse osmosis membrane 221. The inner wall of the bottle body 211 has a first extension section 101 extending toward the first filter element 12 cover, and the first filter element 12 cover is sealed to the first extension section 101. The second filter element 22 cover is connected to one end of the membrane support 222. The inner wall of the bottle body 211 has a second extension section 102 extending toward the second filter element 22 cover. A third water passage 201 is formed between the second extension section 102 and the first extension section 101. The third water passage 201 is connected to the wastewater passage 25 and the wastewater outlet 2125, respectively. The membrane support 222 has a cavity inside, and the first filter assembly 1 and the third filter assembly 3 are both disposed in the cavity. Water permeable holes are provided on the side wall of the membrane support 222.

[0039] In the above structure, the reverse osmosis membrane 221 can effectively remove dissolved salts, organic matter, bacteria, etc. from the water, thus improving water quality. The reverse osmosis membrane 221 is wound around the outer surface of the membrane support 222, which provides support for the reverse osmosis membrane 221, ensuring membrane stability and filtration efficiency. The first filter element 12 cover is connected to one end of the reverse osmosis membrane 221 and is sealed to the first extension section 101 on the inner wall of the bottle body 211. The second filter element 22 cover is connected to one end of the membrane support 222 and is sealed to the second extension section 102 on the inner wall of the bottle body 211, preventing leakage of the filtered fluid and improving the overall sealing of the filter element structure. In addition, a third water passage 201 is formed between the first extension section 101 and the second extension section 102. The third water passage 201 is connected to the wastewater passage 25 and the wastewater outlet 2125, respectively, allowing wastewater to pass through the third water passage 201 and be discharged smoothly from the wastewater outlet 2125. The membrane support 222 has an internal cavity to accommodate the first filter element 1 and the third filter element 3, making the entire filtration system more compact. Finally, the membrane support 222 has water permeable holes on its side wall. After the raw water is filtered by the first filter element 12, it enters the first water outlet channel 14 through the water permeable holes.

[0040] In one embodiment, the third filter bottle 31 is provided with a third opening, and the inner wall of the bottle body 211 has a third extension section 103 facing the third opening. The third opening is sealed to the third extension section. A fourth water passage 202 is formed between the third extension section 103 and the second extension section 102. The fourth water passage 202 is connected to the second water outlet 24 and the second water outlet 2124 respectively.

[0041] In the above structure, the third filter bottle 31 has a third opening, and the inner wall of the bottle body 211 extends a third extension section 103 towards the third opening. The third extension section 103 is sealed to the third opening, ensuring the airtightness of the filter element structure. A fourth water passage 202 is formed between the third extension section 103 and the second extension section 102. The fourth water passage 202 is connected to the second water outlet channel 24 and the second water outlet 2124, respectively, enabling the flow of the second filtered fluid between the second water outlet channel 24 and the second water outlet 2124, ensuring that the second filtered fluid can flow smoothly from the second filtration stage to the water storage tank.

[0042] In one embodiment, the first filter bottle 11 is provided with a first opening, and the inner wall of the bottle body 211 has a fourth extension 104 facing the third opening; the first opening is sealed to the fourth extension 104; a fifth water passage 203 is formed between the fourth extension 104 and the third extension 103, and the fifth water passage 203 is connected to the third water inlet 34 and the third water inlet 2126 respectively.

[0043] In the above structure, the first filter bottle 11 is provided with a first opening, and the inner wall of the bottle body 211 extends a fourth extension section 104 towards the third opening. The fourth extension section 104 is sealed to the first opening, and a fifth water passage 203 is formed between the fourth extension section 104 and the third extension section 103. The fifth water passage 203 is connected to the third water inlet channel 34 and the third water inlet 2126 respectively, so that the second filtration fluid flows between the third water inlet channel 34 and the third water inlet 2126, ensuring that the filtration fluid can flow smoothly into the third filtration stage.

[0044] In one embodiment, the inner wall of the bottle body 211 has a fifth extension 105 facing the first filter element 12; a sixth water passage 204 is formed between the fifth extension 105 and the fourth extension 104, and the sixth water passage 204 is connected to the first water inlet 13 and the first water inlet 2121 respectively.

[0045] In the above structure, a sixth water passage 204 is formed between the fifth extension section 105 and the fourth extension section 104. The sixth water passage 204 is connected to the first water inlet channel 13 and the first water inlet 2121 respectively, ensuring that the filtered fluid can flow smoothly into the first filtration stage, so that different filtered fluids can flow smoothly between different filtration stages, which helps to improve filtration efficiency and water quality.

[0046] In one embodiment, the inner wall of the bottle body 211 has a sixth extension 106 facing the central tube 33, and the end of the central tube 33 is sealed to the sixth extension 106; a seventh water passage 205 is formed between the sixth extension 106 and the fifth extension 105, and the seventh water passage 205 is connected to the first water outlet 14 and the first water outlet 2122 respectively; an eighth water passage 206 is formed in the middle of the sixth extension 106, and the eighth water passage 206 is connected to the third water outlet 37 and the third water outlet 2127 respectively.

[0047] In the above structure, the end of the central tube 33 is sealed to the sixth extension section 106. A seventh water passage 205 is formed between the sixth extension section 106 and the fifth extension section 105. The seventh water passage 205 is connected to the first water outlet channel 14 and the first water outlet 2122, respectively, to ensure that the filtered fluid can flow smoothly from the first filtration stage. An eighth water passage 206 is formed in the middle of the sixth extension section. The eighth water passage 206 is connected to the third water outlet channel 37 and the third water outlet 2127, respectively, to ensure that the filtered fluid can flow smoothly from the third filtration stage. By adding the seventh water passage 205 and the eighth water passage 206, different filtered fluids can flow between different filtration stages, providing fluid input and output for different stages.

[0048] The technical solution of this application forms a multi-stage filtration system by setting a first filter assembly 1, a second filter assembly 2, and a third filter assembly 3 in the filter element. Raw water is filtered by the first filter assembly 1 to form a first filtered fluid. The first filtered fluid is then filtered by the second filter assembly 2 to form a second filtered fluid. The second filtered fluid is output to a water storage tank. When water is needed, the second filtered fluid in the water storage tank is input into the third filter assembly 3 for filtration, and finally output to the water-using device. Specifically, raw water enters through the first inlet channel 13, is filtered by the first filter element 12 to form the first filtered fluid, and can be directly output from the first outlet channel 14. A connector connects the second outlet end of the first outlet channel 14 to the second inlet channel 23, allowing the first filtered fluid to flow through the filter element. The water continues to flow from the second outlet end of the first outlet channel 14 into the second inlet channel 23, where it undergoes further filtration by the second filter element 22 to form a second filtered fluid. This second filtered fluid is then output to the water storage tank through the second outlet channel 24. When water is needed, the second filtered fluid in the water storage tank flows into the first water passage channel 35 through the third inlet channel 34. After further filtration by the third filter element 32, it forms a third filtered fluid, which flows out through the second water passage channel 36 and is finally output to external water-using equipment through the third outlet channel 37. This filter element structure not only improves the overall filtration level but also ensures that the filtered water stored in the water storage tank can pass through the post-filter element (third filter component 3), improving the quality and taste of the filtered water and enhancing the user's water usage experience.

[0049] This application also proposes a water purification device, which includes a water storage tank and a filter element structure. The specific structure of this subject matter is as described in the above embodiments. Since this water purification device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here. The water inlet of the water storage tank is connected to the second water outlet channel 24, and the water outlet of the water storage tank is connected to the third water inlet channel 34.

[0050] The inlet of the water storage tank is connected to the second outlet channel 24, meaning that the fluid filtered by the second filter element 22 can directly flow into the water storage tank for storage. The outlet of the water storage tank is connected to the third inlet channel 34, ensuring that the water in the storage tank can enter the third-stage filtration stage. Raw water first enters the first filter assembly 1 through the first inlet channel 13 for preliminary filtration, forming the first filtered fluid. The first filtered fluid flows into the second filter assembly 2 for second-stage filtration, forming the second filtered fluid, and then flows into the water storage tank. When water is needed, the second filtered fluid in the water storage tank flows into the third filter assembly 3 through the third inlet channel 34 for third-stage filtration, forming the third filtered fluid, and finally output to the water-using equipment. Multi-stage filtration ensures high water quality standards, and through the integrated filter element structure and clearly defined water flow channels, it provides high-precision filtration, improving the user experience. Furthermore, through integrated water passages and sealed connections, the entire system is more compact, reducing the need for external pipe connections and improving the system's integration.

[0051] The above description is merely an exemplary embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made based on the technical concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. A filter element structure, characterized in that, include: The first filtration assembly includes a first filter bottle and a first filter element. The first filter element is disposed inside the first filter bottle. A first water inlet channel is formed between the first filter element and the inner wall of the first filter bottle. A first water outlet channel is formed on the side of the first filter element away from the first water inlet channel. The second filtration assembly includes a second filter bottle and a second filter element. Both the first filtration assembly and the second filter element are disposed inside the second filter bottle. A second water inlet channel is formed between the inner wall of the second filter bottle and the second filter element. The second water inlet channel is used to communicate with the first water outlet channel through a connector. A wastewater channel is formed inside the second filter element. The second filter element and the side away from the second water inlet channel form a second water outlet channel, which is used to connect to a water storage tank. The third filtration assembly includes a third filter bottle, a third filter element, and a central tube. The third filtration assembly is disposed inside the second filter bottle, and both the first filtration assembly and the third filter element are disposed inside the third filter bottle. A third water inlet channel is formed between the inner wall of the third filter bottle and the outer wall of the first filter bottle. A first water passage is formed between the third filter element and the inner wall of the third filter bottle. A second water passage is formed inside the third filter element. One end of the third filter element is connected to one end of the central tube, and the other end of the central tube passes through the first filter element. A first water outlet channel is formed between the first filter element and the central tube. A third water outlet channel is formed inside the central tube, and the third water outlet channel is connected to the second water passage channel; the third water inlet channel is used to connect to the water storage tank; the first filter element is set as a pre-filter element, the second filter element is set as a first post-filter element, and the third filter element is set as a second post-filter element.

2. The filter element structure as described in claim 1, characterized in that, The first filter assembly is located above the third filter element. One end of the first filter bottle is provided with a through hole, and one end of the central tube is provided with an abutment portion. The end of the central tube away from the abutment portion passes through the through hole, and the abutment portion abuts against the end of the first filter bottle with the through hole. The abutment portion is connected to one end of the third filter element. The third water outlet channel passes through the abutment portion and communicates with the second water passage channel.

3. The filter element structure as described in claim 1 or 2, characterized in that, The second filter bottle is provided with a first inlet, a first outlet, a second inlet, a second outlet, a wastewater outlet, a third inlet, and a third outlet. The first inlet is connected to the first inlet channel, and the first outlet is connected to the first outlet channel. The second inlet is connected to the second inlet channel, the second outlet is connected to the second outlet channel, and the wastewater outlet is connected to the wastewater channel. The third inlet is connected to the third inlet channel, and the third outlet is connected to the third outlet channel.

4. The filter element structure as described in claim 3, characterized in that, The second filter bottle includes a bottle body and an end cap. The bottle body has a second opening, and the end cap is connected to the end of the bottle body with the second opening. The first filter assembly, the third filter assembly, and the second filter element are all disposed in the bottle body. The first water inlet, the first water outlet, the second water inlet, and the second water outlet are disposed at the end of the bottle body away from the second opening.

5. The filter element structure as described in claim 4, characterized in that, The second filter element includes a reverse osmosis membrane, a membrane support, a first filter element cover, and a second filter element cover. The reverse osmosis membrane is wound around the outer surface of the membrane support. The first filter element cover is connected to one end of the reverse osmosis membrane. The inner wall of the bottle has a first extension section extending toward the first filter element cover. The first filter element cover is sealed to the first extension section. The second filter element cap is connected to one end of the membrane support. The inner wall of the bottle has a second extension section extending toward the second filter element cap. A third water passage is formed between the second extension section and the first extension section. The third water passage is connected to the wastewater channel and the wastewater outlet respectively. The membrane support has a cavity inside. The first filter assembly and the third filter assembly are both located in the cavity. Water permeable holes are provided on the side wall of the membrane support.

6. The filter element structure as described in claim 5, characterized in that, The third filter bottle has a third opening, and the inner wall of the bottle body has a third extension section facing the third opening. The third opening is sealed to the third extension section. A fourth water passage is formed between the third extension section and the second extension section. The fourth water passage is connected to the second water outlet channel and the second water outlet, respectively.

7. The filter element structure as described in claim 6, characterized in that, The first filter bottle has a first opening, and the inner wall of the bottle body has a fourth extension section facing the third opening; the first opening is sealed to the fourth extension section; a fifth water passage is formed between the fourth extension section and the third extension section, and the fifth water passage is connected to the third water inlet channel and the third water inlet respectively.

8. The filter element structure as described in claim 7, characterized in that, The inner wall of the bottle has a fifth extension section facing the first filter element; a sixth water passage is formed between the fifth extension section and the fourth extension section, and the sixth water passage is connected to the first water inlet channel and the first water inlet respectively.

9. The filter element structure as described in claim 8, characterized in that, The inner wall of the bottle has a sixth extension section facing the central tube, and the end of the central tube is sealed to the sixth extension section; a seventh water passage is formed between the sixth extension section and the fifth extension section, and the seventh water passage is connected to the first water outlet and the first water outlet respectively; an eighth water passage is formed in the middle of the sixth extension section, and the eighth water passage is connected to the third water outlet and the third water outlet respectively.

10. A water purification device, characterized in that, The filter element structure includes any one of claims 1 to 9, and further includes a water storage tank, wherein the inlet end of the water storage tank is connected to the second outlet channel, and the outlet end of the water storage tank is connected to the third inlet channel.

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