Removable filter assembly

Abstract

The application discloses a detachable filter assembly and relates to the technical field of water purification equipment. A rear filter element is coaxially arranged in a second filter bottle. A lower end cover is arranged at the bottom of the rear filter element. A first water passing gap is formed between the lower end cover and the bottom surface of the second filter bottle. A second water passing gap is formed between the rear filter element and the inner wall of the second filter bottle. A second center tube is arranged in the rear filter element. A purified water gap is formed between the second center tube and the lower end cover. The first water passing gap is communicated with the second water passing gap. Water filtered by the rear filter element passes through the purified water gap and enters the second center tube. The technical scheme provided by the application forms the first water passing gap and the second water passing gap, thereby greatly reducing the impact of the water outlet end of the reverse osmosis filter element on the rear filter element, guaranteeing the structural integrity of the rear filter element and reducing the possibility of damage to the structure of the rear filter element.

Description

Technical Field

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

[0002] Because the lifespan of pre-filters and post-filters differs from that of reverse osmosis filters, composite filters are now available that allow for the separate removal of pre-filters and post-filters from reverse osmosis filters. However, this detachable design means that the post-filter is directly impacted by the water flowing out of the reverse osmosis filter, which can easily damage the post-filter structure. Summary of the Invention

[0003] The main objective of this invention is to provide a detachable filter assembly designed to reduce the impact of water flow on the post-filter cartridge, thereby ensuring the structural integrity of the post-filter cartridge.

[0004] To achieve the above objectives, the present invention proposes a detachable filter assembly, comprising:

[0005] First filter bottle;

[0006] The first central tube is coaxially disposed inside the first filter bottle;

[0007] A reverse osmosis filter element, wherein the reverse osmosis filter element is disposed between the first central tube and the first filter bottle;

[0008] The second filter bottle is detachably installed inside the first central tube. The top of the second filter bottle is integrally formed with a rear water outlet channel, and the water outlet side of the reverse osmosis filter element is connected to the bottom of the second filter bottle.

[0009] The second filter bottle contains a coaxially arranged post-filter element, which is hollow. A lower end cap is located at the bottom of the post-filter element, forming a first water passage gap between the lower end cap and the bottom surface of the second filter bottle. A second water passage gap is formed between the post-filter element and the inner wall of the second filter bottle. A second central tube is located inside the post-filter element, communicating with the pure water outlet side of the post-filter element. A clean water gap is formed between the second central tube and the lower end cap. The first water passage gap and the second water passage gap communicate with each other, allowing the filtered water from the post-filter element to pass through the clean water gap and enter the second central tube, which communicates with the post-filter outlet channel.

[0010] In one embodiment, a separator is provided on the outer periphery of the second central tube, the separator dividing the internal space of the second filter bottle into an upper cavity and a lower cavity, and the post-filter element is disposed in the lower cavity.

[0011] In one embodiment, the top surface of the lower end cap protrudes to form a mating portion, which extends into the second central tube.

[0012] In one embodiment, a support plate is provided inside the first central tube, the support plate being used to provide support for the second filter bottle.

[0013] In one embodiment, a water passage is provided in the support plate, and a connecting portion is also formed on the surface of the support plate facing the second filter bottle. The connecting portion is hollow and communicates with the second filter bottle.

[0014] In one embodiment, the bottom of the second filter bottle protrudes towards the support plate to form an embedded portion, which is embedded in the communicating portion. The embedded portion is hollow and is used to connect the communicating portion and the second filter bottle.

[0015] In one embodiment, a sealing element is provided on the outer periphery of the separator, and the sealing element is pressed between the inner wall of the second filter bottle and the outer periphery of the separator.

[0016] In one embodiment, a rear limiting ring is provided on the bottom surface of the separator, the rear limiting ring being used to limit the position of the rear filter element.

[0017] In one embodiment, a pre-filter is provided in the upper cavity, and a front limiting ring is provided on the top surface of the separator, the front limiting ring being used to limit the position of the pre-filter.

[0018] In one embodiment, a retaining ring is provided on the outer periphery of the lower end cover, the retaining ring being used to fix the rear filter element.

[0019] The present invention also proposes a water purification device, including the above-mentioned detachable filter assembly.

[0020] The technical solution of the present invention adopts a lower end cap inside the second filter bottle, and then the lower end cap cooperates with the second filter bottle to form a first water passage gap and a second water passage gap, thereby greatly reducing the impact of the water outlet of the reverse osmosis filter element on the post-filter element, ensuring the structural integrity of the post-filter element, and reducing the possibility of damage to the post-filter element structure. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0022] Figure 1 A schematic diagram of the overall structure of the detachable filter assembly provided by the present invention;

[0023] Figure 2 A cross-sectional view of the detachable filter assembly provided by the present invention;

[0024] Figure 3 for Figure 2 Enlarged view of section A;

[0025] Figure 4 for Figure 2 Enlarged view of section B;

[0026] Figure 5 for Figure 2 Enlarged view of section C;

[0027] Figure 6 This is an exploded view of the pre-filter, post-filter, and second central tube.

[0028] Figure 7 This is a schematic diagram showing the fit between the lower end cap and the second central tube.

[0029] Explanation of icon numbers:

[0030] 1. First filter bottle; 11. First central tube; 12. Reverse osmosis filter element; 13. Support plate; 131. Water passage; 132. Connecting part; 2. Second filter bottle; 201. Pre-inlet water passage; 202. Pre-outlet water passage; 203. Post-outlet water passage; 21. Post-filter element; 22. Lower end cap; 221. Fitting part; 222. Fixing ring; 223. Annular retaining tooth; 23. First water passage gap; 24. Second water passage gap; 25. Upper cavity; 26. Lower cavity; 27. Pre-filter element; 28. Embedding part; 281. Sealing groove; 282. Sealing ring; 3. Second central tube; 311. Water passage groove; 31. Clean water gap; 32. Separator; 321. Sealing element; 322. Annular groove; 323. Post-limiting ring; 324. Pre-limiting ring.

[0031] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention 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 the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0033] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications 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 indications will also change accordingly.

[0034] Furthermore, if the embodiments of this invention 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. Thus, 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 where both A and B are satisfied simultaneously. 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 by this invention.

[0035] In water purification equipment, filter cartridges are commonly used to filter water. Filter cartridges generally include pre-filters for filtering large particles such as flocculents, reverse osmosis filters for reducing the concentration of salt ions in the water and filtering microorganisms, and post-filters for improving the taste of purified water.

[0036] A pre-filter is the filter element in a water purification system that prioritizes water filtration. Post-filters are located downstream of the pre-filter and can either directly filter water already filtered by the pre-filter or water that has passed through a pre-filter and then other filters (such as a reverse osmosis filter). Pre-filters protect higher-precision reverse osmosis filters; they also remove residual chlorine, preventing it from damaging the reverse osmosis membrane; and they can adsorb some organic matter in the water for better filtration. Specifically, pre-filters remove large particles of impurities such as sediment, rust, insect eggs, and suspended solids, ensuring initial purification of the water entering the home. These impurities, if directly introduced into the water purification system, can easily cause clogging and wear; pre-filters effectively protect these devices from damage. The initial filtration by the pre-filter significantly reduces the filtration burden on subsequent water purification equipment (such as water purifiers and reverse osmosis systems), thus extending their lifespan. Because of the pre-filter, the frequency of filter replacement in subsequent water purifiers will decrease, thus reducing costs associated with frequent filter changes. Furthermore, the pre-filter improves water quality; water filtered through it has significantly reduced impurities, resulting in a marked improvement in water quality. Simultaneously, the pre-filter reduces turbidity, minimizing the possibility of bacterial growth and effectively reducing secondary contamination of pipes and tanks. Some pre-filters also have scale-inhibiting properties; for example, those containing hydrochloric acid polyphosphate can reduce scale formation inside the device.

[0037] Post-filters further purify water, removing residual impurities. Specifically, they remove minute impurities, odors, and discoloration that may remain in water after treatment by pre-filters and main filters (such as RO reverse osmosis membranes). These impurities may include tiny suspended solids and organic compounds. Post-filters, especially activated carbon filters, effectively adsorb odors and residual chlorine, resulting in a fresher, sweeter taste. This is crucial for improving drinking water quality. In some cases, water treated by RO reverse osmosis membranes may be slightly acidic. Certain components in post-filters (such as minerals) can help regulate the water's pH, bringing it closer to neutral or a suitable drinking level. Some post-filters are also designed to add minerals to meet the needs of specific groups requiring mineral water. Furthermore, the further purification by post-filters reduces harmful impurities and substances in the water that could damage downstream devices (such as water dispensers and electric kettles), thus extending their lifespan. Because of the presence of the post-filter, the frequency of cleaning and maintenance of subsequent equipment will be reduced accordingly, thereby reducing the costs incurred due to equipment failure or maintenance.

[0038] To reduce the overall size of water purification equipment, filter elements with different functions are integrated into a composite filter, that is, the pre-filter, reverse osmosis filter, and post-filter are integrated into a composite filter. Considering that the service life of the pre-filter and post-filter differs greatly from that of the reverse osmosis filter, there are now composite filter elements that allow the pre-filter and post-filter to be removed separately from the reverse osmosis filter. Existing reverse osmosis (RO) filter cartridges are generally spiral wound cartridges, where the RO membrane is rolled up to form the cartridge. Spiral wound cartridges have gaps for water inlet and outlet. In current technology, water filtered through the RO filter cartridge is called pure water, water not filtered by the RO filter cartridge is called raw water, and water with a high ion concentration retained during the RO filtration process is called wastewater. Spiral wound RO filter cartridges are generally hollow, with gaps between adjacent membranes. Raw water enters from one end of the spiral wound cartridge into the gaps between the membranes. Under pressure, the water passes through the RO membrane to form pure water, while ions and other solutes remain in the gaps of the RO filter cartridge. These ions mix with the subsequent raw water. As the RO filtration process continues, some water with a high ion concentration is squeezed out of the gaps under the pressure of the raw water inlet, forming wastewater. Therefore, the water pressure remains relatively high throughout the RO filtration process.

[0039] To avoid leaks or cross-contamination, a detachable design requires that the detachable parts or related structures be as simple as possible to reduce sealing difficulties. Therefore, the detachable design of the post-filter requires that the water path between the reverse osmosis filter and the post-filter be as simple as possible. As a result, the detachable design makes the post-filter more susceptible to direct impact from the water flowing out of the reverse osmosis filter, which can easily damage the structure of the post-filter.

[0040] Reference Figures 1 to 3To address the aforementioned issues, this invention proposes a detachable filter assembly. This assembly allows for the replacement of the pre-filter 27 and / or post-filter 21 while minimizing the impact of the reverse osmosis filter 12's output water on the post-filter 21, thus ensuring the structural integrity of the post-filter 21. The detachable filter assembly includes a first filter bottle 1, a first central tube 11, and a reverse osmosis filter 12. The first central tube 11 is coaxially disposed within the first filter bottle 1, and the reverse osmosis filter 12 is disposed between the first central tube 11 and the first filter bottle 1. A second filter bottle 2 is detachably disposed within the first central tube 11, and the outlet side of the reverse osmosis filter 12 communicates with the bottom of the second filter bottle 2. Specifically, a post-filter 21 is coaxially disposed within the second filter bottle 2. The post-filter 21 is hollow, and a lower end cap 22 is provided at the bottom of the post-filter 21. A first water passage is formed between the lower end cap 22 and the bottom surface of the second filter bottle 2. A second water passage gap 24 is formed between the post-filter cartridge 21 and the inner wall of the second filter bottle 2. A second central tube 3 is provided inside the post-filter cartridge 21. The second central tube 3 is connected to the pure water outlet side of the post-filter cartridge 21, and a clean water gap 31 is formed between the second central tube 3 and the lower end cap 22. When water is filtered by the reverse osmosis filter cartridge 12, it will enter the second filter bottle 2 from the first filter bottle 1. When the water flows into the second filter bottle 2, it will first pass through the first water passage gap 23, then enter the second water passage gap 24, and then be filtered by the post-filter cartridge 21 before passing through the clean water gap 31 and being discharged through the second central tube 3. The setting of the first water passage gap 23 and the second water passage gap 24 actually reduces the flow cross section of the water after it enters the second filter bottle 2, thereby limiting the water flow rate and reducing the possibility of the post-filter cartridge 21 being damaged by the rushing water due to excessive water pressure, thus ensuring the structural integrity of the post-filter cartridge 21.

[0041] Reference Figures 2 to 5In this invention, a separator 32 is provided on the outer periphery of the second central tube 3. The separator 32 is used to separate the internal space of the second filter bottle 2. Specifically, the separator 32 divides the second filter bottle 2 into an upper cavity 25 and a lower cavity 26, and the post-filter element 21 is disposed in the lower cavity 26. Since the post-filter element 21 is hollow, the second central tube 3 is actually inserted into the post-filter element 21. Thus, the second central tube 3 can provide a certain degree of support for the post-filter element 21. Specifically, the lower end cap 22 is fixed to the bottom of the post-filter element 21, while the top of the post-filter element 21 is fixedly connected to the separator 32. Therefore, the post-filter element 21 is actually fixed between the lower end cap 22 and the separator 32. A fixing ring 222 is provided on the outer periphery of the lower end cap 22, which is used to fix the post-filter element 21. Due to the setting of the first water passage gap 23 and the second water passage gap 24, water actually permeates from the outer periphery of the post-filter element 21 to the inner ring of the post-filter element 21 to complete the filtration. Therefore, the post-filter element 21 is actually constantly subjected to the impact of water flow during the filtration process. In addition to discharging the water filtered by the post-filter element 21 into the second filter bottle 2, the setting of the second central tube 3, which is inserted into the inner ring of the post-filter element 21, can use the tube wall of the second central tube 3 to support the post-filter element 21, thereby reducing the possibility of the post-filter element 21 being damaged by water flow impact during the filtration process.

[0042] Reference Figures 3 to 7 It should be noted that, in order to maintain the supporting effect of the second central tube 3 on the post-filter element 21, the bottom end of the second central tube 3 is flush with the end face of the bottom end of the post-filter element 21 as much as possible; several annular teeth 223 are provided on the upper end face of the lower end cover 22, so when the lower end cover 22 is fixed to the bottom end of the post-filter element 21, there is still a gap between the lower end cover 22 and the post-filter element 21, that is, there is also a gap between the second central tube 3 and the lower end cover 22. This gap is the water purification gap 31; however, in the actual filtration process, the water purification gap 31 is too small, so the water flow rate that can pass through the water purification gap 31 is also limited. The small size of the filter element 21 limits its filtration efficiency. Therefore, in order to improve the water flow efficiency of the water purification gap 31 while maintaining the support of the second central tube 3 for the filter element 21, several water flow grooves 311 are provided on the bottom end of the second central tube 3. The water flow grooves 311 are also part of the water purification gap 31. Thus, the opening of the water flow grooves 311 actually expands the flow cross section of the water purification gap 31, thereby increasing the flow rate of the water purification gap 31 per unit time, that is, increasing the water output of the filter element 21. This ensures the structural integrity of the filter element 21 while improving the overall filtration efficiency.

[0043] Correspondingly, a mating part 221 is formed on the top surface of the lower end cover 22. The mating part 221 extends into the second central tube 3. The mating part 221 can be used to guide the water entering the second central tube 3. That is, when the water enters the central tube through the water purification gap 31, it will change its flow direction along the length of the mating part 221, thereby reducing the generation of turbulence in the second central tube 3, thereby reducing the vibration of the second central tube 3 and improving the quietness of the overall structure during the filtration process. In addition, the reduction of turbulence will make the water flow more stable during the filtration process, further improving the stability of the overall structure.

[0044] Reference Figures 3 to 7 In this invention, considering that the reverse osmosis filter element 12 is disposed between the first filter bottle 1 and the first central tube 11, in order to reduce unnecessary flow path settings, that is, to simplify the flow path, it is necessary to directly introduce the water filtered by the reverse osmosis filter element 12 to the bottom of the second filter bottle 2; for this purpose, a support plate 13 is provided inside the first central tube 11, the support plate 13 is used to provide support for the second filter bottle 2, and the support plate 13 is hollow to form a water passage 131, and a connecting portion 132 is formed on the surface of the support plate 13 facing the second filter bottle 2. 2. Also hollow, the connecting part 132 communicates with the second filter bottle 2; the support plate 13 can provide support for the second filter bottle 2, and the water passage 131 and connecting part 132 on it can introduce water filtered by the reverse osmosis filter element 12 into the second filter bottle 2; thus, the support plate 13 can provide support for the second filter bottle 2 and introduce water filtered by the reverse osmosis filter element 12 into the second filter bottle 2 at the same time, that is, the support plate 13 has both support and flow guiding functions, which reduces the flow path design and makes the overall structure more concise and more integrated.

[0045] Reference Figures 3 to 7 Correspondingly, the bottom of the second filter bottle 2 protrudes towards the support plate 13 to form an embedded part 28. The embedded part 28 is embedded in the connecting part 132 and is hollow, so that the embedded part 28 can connect the connecting part 132 and the second filter bottle 2. That is, water in the connecting part 132 can enter the second filter bottle 2 through the embedded part 28. The embedded part 28 on the second filter bottle 2 is actually designed to cooperate with the connecting part 132 to introduce water into the second filter bottle 2. Considering the setting of the connecting part 132, if a notch is opened on the second filter bottle 2 for the connecting part 132 to be embedded, it may be necessary to set up a structure inside the second filter bottle 2 to guide the water flow, which will increase the design difficulty inside the second filter bottle 2 and is not conducive to the smooth flow of water. The setting of the embedded part 28 can introduce water into the second filter bottle 2 without increasing the internal structure of the second filter bottle 2. At the same time as introducing water into the second filter bottle 2, the embedded part 28, in cooperation with the connecting part 132, also provides support for the second filter bottle 2 as a whole.

[0046] It should be noted that the embedded part 28 also facilitates the removal of the second filter bottle 2 from the first central tube 11. Specifically, the size of the second filter bottle 2 is adapted to the first central tube 11, that is, the outer diameter of the second filter bottle 2 is slightly smaller than the inner diameter of the first central tube 11, and it is necessary that the second filter bottle 2 does not easily shake within the first central tube 11. The specific dimensions will not be elaborated here, as long as the above requirements are met. Thus, the first central tube 11 can limit the movement of the second filter bottle 2 within it, that is, the first central tube 11 can restrict the movement direction of the second filter bottle 2 within it, so that the second filter bottle 2 can only move up and down. Furthermore, since the second filter bottle 2 can only move up and down, it is necessary to design a structure that can fix the second filter bottle 2 by moving up and down, and in order to reduce unnecessary flow path settings, the second filter bottle 2 needs to be fixed after completion. While maintaining the connection, the water path connected to the first filter bottle 1 is also opened. In summary, the cooperation of the embedded part 28, i.e. the connecting part 132, can meet the above requirements. When the embedded part 28 and the connecting part 132 are in a connected state, that is, when the embedded part 28 is embedded in the connecting part 132, the water in the first filter bottle 1 that has been filtered by the reverse osmosis filter element 12 can directly enter the second filter bottle 2 and then be filtered by the post-filter element 21. When disassembling the second filter bottle 2, the user can directly pull the second filter bottle 2 out of the first central tube 11, so that the embedded part 28 is separated from the connecting part 132, and the disassembly of the second filter bottle 2 can be completed. The cooperation between the connecting part 132 and the embedded part 28 allows the second filter bottle 2 to meet the requirement of being removable and replaceable while reducing the internal flow path design and improving the overall structural integrity.

[0047] Reference Figures 3 to 7 Accordingly, in order to seal the connection between the embedded part 28 and the connecting part 132, i.e. to prevent water from overflowing from the connection, at least one sealing groove 281 is provided on the outer periphery of the embedded part 28. A sealing ring 282 is provided in the sealing groove 281, and the sealing ring 282 is pressed between the embedded part 28 and the connecting part 132. The sealing ring 282 provides a seal between the embedded part 28 and the connecting part 132, thereby reducing the possibility of water overflowing from the embedded part 28 and the connecting part 132 and ensuring the airtightness of the overall structure. In addition, the sealing ring 282 can also prevent external impurities from entering between the embedded part 28 and the connecting part 132. That is, while preventing water from overflowing, the sealing ring 282 can also prevent external impurities from entering between the embedded part 28 and the connecting part 132, thereby preventing the possibility of external impurities entering the second filter bottle 2 through the gap between the embedded part 28 and the connecting part 132, and thus preventing the water from being contaminated by external impurities. In this invention, two sealing grooves 281 are provided on the outer periphery of the embedded part 28, and a sealing ring 282 is provided in each sealing groove 281 to improve the sealing between the embedded part 28 and the communicating part 132.

[0048] Reference Figures 3 to 7It should be noted that the sealing ring 282 also provides a fixation for the connection between the embedded part 28 and the connecting part 132. During the process of the embedded part 28 being embedded into the connecting part 132, the sealing ring 282 will be squeezed and deformed, which is equivalent to providing resistance between the connecting part 132 and the embedded part 28. When the connecting part 132 is separated from the embedded part 28, the sealing ring 282 will prevent this separation. Considering that the water filtered by the reverse osmosis filter element 12 still has a large water pressure, when the water first enters the second filter bottle 2, the second filter bottle 2 may have a tendency for the embedded part 28 to fall out of the connecting part 132 due to the impact of the water pressure. Therefore, the resistance provided by the sealing ring 282 can effectively overcome this tendency, so that the embedded part 28 is still embedded in the connecting part 132, avoiding the possibility of loosening of the connection between the embedded part 28 and the connecting part 132.

[0049] Furthermore, it should be further explained that a pre-filter element 27 can be installed in the upper cavity 25 of the second filter bottle 2, that is, the second filter bottle 2 contains both a pre-filter element 27 and a post-filter element 21, so that all water filtration can be completed in the overall structure proposed in this invention; in addition to further improving the integration of the overall structure, the installation of the pre-filter element 27 can actually further balance the movement trend of the second filter element; specifically, the pre-filter element 27 purifies water from the top of the second filter bottle 2, while the post-filter element 21 enters water from the bottom of the second filter bottle 2, so the water inlet pressure of the two can cancel each other out. Based on the above description of the first water passage gap 23 and the second water passage gap 24, it should be noted that when the upper cavity 25 is equipped with a pre-filter element 27, the arrangement of the first water passage gap 23, the second water passage gap 24, and the purified water gap 31 actually cancels out the pressure difference between the pre-filter element 27 and the post-filter element 21. Specifically, water flowing through the first water passage gap 23 and the second water passage gap 24 will exert pressure on the lower end cover 22 and the separator 32, respectively, while the pre-filter element 27 will exert pressure on the separator 32 during the filtration process. Based on this, the pressure of the water entering the post-filter element 21 and the water entering the pre-filter element 27 cancels out.

[0050] Reference Figures 3 to 7 Correspondingly, the top of the second filter bottle 2 is integrally formed with a front water inlet channel 201, a front water outlet channel 202, and a rear water outlet channel 203. The second central tube 3 passes through the front filter element 27 and is sealed to the rear water outlet channel 203. Specifically, the front water inlet channel 201, the front water outlet channel 202, and the rear water outlet channel 203 are all located at the top of the second central tube 3, that is, all three are located at one end of the second filter bottle 2, which further reduces the design of additional water channels and facilitates the integration and miniaturization of the overall structure.

[0051] Based on the setting of the pre-filter 27, a front limiting ring can be set on the top surface of the separator 32. The front limiting ring is used to limit the pre-filter 27 to prevent the pre-filter 27 from swinging, so as to ensure the filtration effect of the pre-filter 27 on water.

[0052] Reference Figures 3 to 7 Furthermore, based on the setting of the pre-filter 27, it is necessary to seal and isolate the pre-filter 27 and the post-filter 21 to avoid cross-contamination between them. To this end, at least one annular groove 322 is provided on the outer periphery of the separator 32, and at least one sealing element 321 is provided in the annular groove 322. The sealing element 321 is pressed between the inner wall of the second filter bottle 2 and the outer periphery of the separator 32, so that the sealing element 321 can provide a seal for the separator 32 and avoid cross-contamination of water caused by cross-flow between the upper chamber 25 and the lower chamber 26.

[0053] To further secure the post-filter element 21, a rear limiting ring 323 is provided on the bottom surface of the separator 32. The rear limiting ring 323 is used to limit the position of the post-filter element 21. In conjunction with the above, a fixing ring 222 is provided on the outer periphery of the lower end cover 22. The setting of the fixing ring 222 and the rear limiting ring 323 effectively restricts the position of the post-filter element 21 in the second filter bottle 2. That is, when the post-filter element 21 is impacted by the water flow from the reverse osmosis filter element 12, the post-filter element 21 is not easy to move, so as to ensure its filtration effect on water. In addition, the fixing ring 222, the rear limiting ring 323 and the second central tube 3 together support the post-filter element 21, further reducing the possibility of structural damage to the post-filter element 21 during the filtration process and ensuring the service life of the post-filter element 21.

[0054] The present invention also proposes a water purification device, the second subject of which includes the above-mentioned detachable filter component. The specific structure of the detachable filter component is as described in the above embodiments. Since the present 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.

[0055] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A removable filter assembly comprising: The utility model discloses a filter assembly and a filter bottle thereof A first filter bottle; A first central tube coaxially arranged in the first filter bottle; A reverse osmosis filter element arranged between the first central tube and the first filter bottle; A second filter bottle detachably arranged in the first central tube, the top of the second filter bottle being integrally formed with a rear water outlet channel, the water outlet side of the reverse osmosis filter element being communicated with the bottom of the second filter bottle; The second filter bottle is coaxially arranged with a rear filter element, the rear filter element being hollow, the bottom of the rear filter element being provided with a lower end cover, a first water passing gap being formed between the lower end cover and the bottom surface of the second filter bottle, a second water passing gap being formed between the rear filter element and the inner wall of the second filter bottle, a second central tube being arranged in the rear filter element, the second central tube being communicated with the pure water outlet side of the rear filter element, a pure water gap being formed between the second central tube and the lower end cover; the first water passing gap is communicated with the second water passing gap, the water filtered by the rear filter element passing through the pure water gap and entering the second central tube, the second central tube being communicated with the rear water outlet channel.

2. The removable filter assembly of claim 1, wherein, The outer periphery of the second central tube is provided with a partition, the partition dividing the internal space of the second filter bottle into an upper cavity and a lower cavity, the rear filter element being arranged in the lower cavity.

3. The removable filter assembly of claim 2, wherein, The top surface of the lower end cover is protrudingly formed with a matching part, the matching part extending into the second central tube.

4. The demountable filter assembly of any one of claims 2-3, wherein, A support plate is arranged in the first central tube, the support plate being used for supporting the second filter bottle.

5. The removable filter assembly of claim 4, wherein, A water passing channel is formed in the support plate, a communication part being further protrudingly formed on the surface of the support plate facing the second filter bottle, the communication part being hollow, the communication part being communicated with the second filter bottle.

6. The removable filter assembly of claim 5, wherein, An embedding part is protrudingly formed on the bottom of the second filter bottle towards the support plate, the embedding part being embedded in the communication part, the embedding part being hollow, the embedding part being used for connecting the communication part and the second filter bottle.

7. The removable filter assembly of claim 4, wherein, The outer periphery of the partition is provided with a sealing part, the sealing part being press-connected between the inner wall of the second filter bottle and the outer periphery of the partition.

8. The removable filter assembly of claim 7, wherein, The bottom surface of the partition is provided with a rear limiting ring, the rear limiting ring being used for limiting the rear filter element.

9. The removable filter assembly of claim 7, wherein, The upper cavity is provided with a front filter element, the top surface of the partition being provided with a front limiting ring, the front limiting ring being used for limiting the front filter element.

10. The removable filter assembly of claim 4, wherein, The outer periphery of the lower end cover is provided with a fixing ring, the fixing ring being used for fixing the rear filter element.

11. A water purification apparatus characterized by comprising: The utility model discloses a filter assembly and a filter bottle thereof A first filter bottle; A first central tube coaxially arranged in the first filter bottle; A reverse osmosis filter element arranged between the first central tube and the first filter bottle; A second filter bottle detachably arranged in the first central tube, the top of the second filter bottle being integrally formed with a rear water outlet channel, the water outlet side of the reverse osmosis filter element being communicated with the bottom of the second filter bottle; The second filter bottle is coaxially arranged with a rear filter element, the rear filter element being hollow, the bottom of the rear filter element being provided with a lower end cover, a first water passing gap being formed between the lower end cover and the bottom surface of the second filter bottle, a second water passing gap being formed between the rear filter element and the inner wall of the second filter bottle, a second central tube being arranged in the rear filter element, the second central tube being communicated with the pure water outlet side of the rear filter element, a pure water gap being formed between the second central tube and the lower end cover; the first water passing gap is communicated with the second water passing gap, the water filtered by the rear filter element passing through the pure water gap and entering the second central tube, the second central tube being communicated with the rear water outlet channel. The outer periphery of the second central tube is provided with a partition, the partition dividing the internal space of the second filter bottle into an upper cavity and a lower cavity, the rear filter element being arranged in the lower cavity. The top surface of the lower end cover is protrudingly formed with a matching part, the matching part extending into the second central tube. A support plate is arranged in the first central tube, the support plate being used for supporting the second filter bottle. A water passing channel is formed in the support plate, a communication part being further protrudingly formed on the surface of the support plate facing the second filter bottle, the communication part being hollow, the communication part being communicated with the second filter bottle. An embedding part is protrudingly formed on the bottom of the second filter bottle towards the support plate, the embedding part being embedded in the communication part, the embedding part being hollow, the embedding part being used for connecting the communication part and the second filter bottle. The outer periphery of the partition is provided with a sealing part, the sealing part being press-connected between the inner wall of the second filter bottle and the outer periphery of the partition. The bottom surface of the partition is provided with a rear limiting ring, the rear limiting ring being used for limiting the rear filter element. The upper cavity is provided with a front filter element, the top surface of the partition being provided with a front limiting ring, the front limiting ring being used for limiting the front filter element. The outer periphery of the lower end cover is provided with a fixing ring, the fixing ring being used for fixing the rear filter element. The utility model discloses a filter assembly and a filter bottle thereof A first filter bottle; A first central tube coaxially arranged in the first filter bottle; A reverse osmosis filter element arranged between the first central tube and the first filter bottle; A second filter bottle detachably arranged in the first central tube, the top of the second filter bottle being integrally formed with a rear water outlet channel, the water outlet side of the reverse osmosis filter element being communicated with the bottom of the second filter bottle; The second filter bottle is coaxially arranged with a rear filter element, the rear filter element being hollow, the bottom of the rear filter element being provided with a lower end cover, a first water passing gap being formed between the lower end cover and the bottom surface of the second filter bottle, a second water passing gap being formed between the rear filter element and the inner wall of the second filter bottle, a second central tube being arranged in the rear filter element, the second central tube being communicated with the pure water outlet side of the rear filter element, a pure water gap being formed between the second central tube and the lower end cover; the first water passing gap is communicated with the second water passing gap, the water filtered by the rear filter element passing through the pure water gap and entering the second central tube, the second central tube being communicated with the rear water outlet channel. The outer periphery of the second central tube is provided with a partition, the partition dividing the internal space of the second filter bottle into an upper cavity and a lower cavity, the rear filter element being arranged in the lower cavity. The top surface of the lower end cover is protrudingly formed with a matching part, the matching part extending into the second central tube. A support plate is arranged in the first central tube, the support plate being used for supporting the second filter bottle. A water passing channel is formed in the support plate, a communication part being further protrudingly formed on the surface of the support plate facing the second filter bottle, the communication part being hollow, the communication part being communicated with the second filter bottle. An embedding part is protrudingly formed on the bottom of the second filter bottle towards the support plate, the embedding part being embedded in the communication part, the embedding part being hollow, the embedding part being used for connecting the communication part and the second filter bottle. The outer periphery of the partition is provided with a sealing part, the sealing part being press-connected between the inner wall of the second filter bottle and the outer periphery of the partition. The bottom surface of the partition is provided with a rear limiting ring, the rear limiting ring being used for limiting the rear filter element. The upper cavity is provided with a front filter element, the top surface of the partition being provided with a front limiting ring, the front limiting ring being used for limiting the front filter element. The outer periphery of the lower end cover is provided with a fixing ring, the fixing ring being used for fixing the rear filter element. The utility model discloses a filter assembly and a filter bottle thereof A first filter bottle; A first central tube coaxially arranged in the first filter bottle; A reverse osmosis filter element arranged between the first central tube and the first filter bottle; A second filter bottle detachably arranged in the first central tube, the top of the second filter bottle being integrally formed with a rear water outlet channel, the water outlet side of the reverse osmosis filter element being communicated with the bottom of the second filter bottle; The second filter bottle is coaxially arranged with a rear filter element, the rear filter element being hollow, the bottom of the rear filter element being provided with a lower end cover, a first water passing gap being formed between the lower end cover and the bottom surface of the second filter bottle, a second water passing gap being formed between the rear filter element and the inner wall of the second filter bottle, a second central tube being arranged in the rear filter element, the second central tube being communicated with the pure water outlet side of the rear filter element,

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