Detachable filtering assembly and water purifying equipment

Abstract

The utility model 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, and a second 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 central pipe is arranged in the rear filter element, and a water purification gap is formed between the second central pipe and the lower end cover; the first water passing gap is communicated with the second water passing gap, and water filtered by the rear filter element penetrates through the purified water gap and enters the second central pipe; according to the technical scheme provided by the utility model, the first water passing gap and the second water passing gap are formed, so that the impact of the water outlet end of the reverse osmosis filter element on the rear filter element is greatly reduced, the structural integrity of the rear filter element is guaranteed, and the possibility of structural damage of the rear filter element is reduced.

Description

Technical Field

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

[0002] Since the service life of the pre-filter and post-filter is different from that of the reverse osmosis filter, there is currently a composite filter element that can remove the pre-filter and post-filter from the reverse osmosis filter separately. However, the detachable setting will cause the post-filter to be directly impacted by the water flowing out of the reverse osmosis filter, which may easily damage the post-filter structure. Utility Model Content

[0003] The main purpose of this utility model is to provide a detachable filter assembly, which aims to reduce the impact of water flow on the post-filter element to ensure the structural integrity of the post-filter element.

[0004] To achieve the above purpose, the detachable filter assembly proposed in the present invention comprises

[0005] First filter bottle;

[0006] a first central tube, the first central tube being coaxially disposed in the first filter bottle;

[0007] a reverse osmosis filter element, the reverse osmosis filter element being disposed between the first central tube and the first filter bottle;

[0008] a second filter bottle, the second filter bottle being detachably disposed in the first central tube, the water outlet side of the reverse osmosis filter element being in communication with the bottom of the second filter bottle;

[0009] In which, a post-filter element is coaxially arranged in the second filter bottle, the post-filter element is hollow, and a lower end cover is arranged at the bottom of the post-filter element. A first water flow gap is formed between the lower end cover and the bottom surface of the second filter bottle, and a second water flow gap is formed between the post-filter element and the inner wall of the second filter bottle. A second center tube is arranged in the post-filter element, the second center tube is communicated with the pure water outlet side of the post-filter element, and a clean water gap is formed between the second center tube and the lower end cover; the first water flow gap is communicated with the second water flow gap, and the water filtered by the post-filter element passes through the clean water gap and enters the second center tube.

[0010] In one embodiment, a partition is provided on the outer periphery of the second central tube, and the partition divides the inner space of the second filter bottle into an upper chamber and a lower chamber, and the post-filter element is provided in the lower chamber.

[0011] In one embodiment, a fitting portion is protrudingly formed on the top surface of the lower end cover, and the fitting portion extends into the second center tube.

[0012] In one embodiment, a support plate is disposed in the first central tube, and the support plate is 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 protruding from 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 toward the support plate to form an embedding portion, the embedding portion is embedded in the connecting portion, the embedding portion is hollow, and is used to connect the connecting portion and the second filter bottle.

[0015] In one embodiment, a sealing member is provided on the outer periphery of the separator, and the sealing member 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, and the rear limiting ring is used to limit the position of the rear filter element.

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

[0018] In one embodiment, a fixing ring is provided on the outer periphery of the lower end cover, and the fixing ring is used to fix the post-filter element.

[0019] The utility model also provides a water purification device, comprising the above-mentioned detachable filter assembly.

[0020] The technical solution of the present invention adopts the method of arranging a lower end cover in the second filter bottle, and then cooperating with the lower end cover and the second filter bottle to form a first water flow gap and a second water flow gap, thereby greatly reducing the impact of the water outlet end 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0022] Figure 1 This is a schematic diagram of the overall structure of the detachable filter assembly provided by the utility model;

[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 part A;

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

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

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

[0028] Figure 7 Schematic diagram of the cooperation between the lower end cover and the second center tube.

[0029] Description of Figure 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. Front water inlet channel; 202. Front water outlet channel; 203. Rear water outlet channel; 21. Rear filter element; 22. Lower end cover; 221. Fitting part; 222. Fixing ring; 223. Annular latch; 23. First water gap; 24. Second water gap; 25. Upper cavity; 26. Lower cavity; 27. Front filter element; 28. Embedded part; 281. Sealing groove; 282. Sealing ring; 3. Second central tube; 311. Water passage; 31. Clean water gap; 32. Separator; 321. Seal; 322. Ring groove; 323. Rear limiting ring; 324. Front limiting ring.

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

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall 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 position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0034] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

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

[0036] A pre-filter is a filter element in the water system of a water purification system that prioritizes water filtration. A post-filter element is located downstream of the pre-filter element in the water system. It can filter water directly after the pre-filter element has been filtered, or it can filter water that has been filtered by the pre-filter element and then by other filters (such as reverse osmosis filters). The pre-filter element protects the higher-precision reverse osmosis filter element and removes residual chlorine, preventing it from damaging the reverse osmosis membrane. The pre-filter element also absorbs some organic matter in the water to achieve better filtration results. Specifically, the pre-filter element filters large particles of impurities in the water, effectively removing large particles such as silt, rust, insect eggs, and suspended solids, ensuring initial purification of the water entering the home. If these impurities enter the water purification system directly, they can easily cause clogging and wear. The use of a pre-filter element effectively protects these devices from damage. The initial filtration provided by the pre-filter element significantly reduces the filtration burden on subsequent water purification equipment (such as water purifiers and water purifiers), thereby extending the service life of these devices. The presence of a pre-filter reduces the frequency of filter replacements in subsequent water purification equipment, thereby reducing the costs associated with frequent filter replacements. Furthermore, a pre-filter can improve water quality. After filtering, the impurity content in the water is significantly reduced, significantly improving water quality. Furthermore, a pre-filter can reduce water turbidity and the potential for bacterial growth, effectively minimizing secondary contamination in pipes, water tanks, and other areas. Some pre-filters also have scale inhibition properties. For example, using a scale-inhibiting filter containing hydrochloric acid and phosphate can reduce scale formation within the equipment.

[0037] Post-filters further purify water and remove residual impurities. Specifically, they remove any remaining impurities, odors, and discoloration that may remain in water after treatment with the pre-filter and primary filter (such as a RO reverse osmosis membrane). These impurities may include tiny suspended solids and organic compounds. Post-filters, particularly activated carbon filters, effectively absorb odors and residual chlorine, making the treated water taste fresher and sweeter. This is crucial for improving the quality of drinking water. In some cases, water treated with an RO reverse osmosis membrane may exhibit a certain acidity. Components in post-filters, such as minerals, can help adjust the water's pH to a more neutral or potable pH. Some post-filters are also designed to increase the amount of minerals in the water, meeting the needs of specific individuals for mineralized water. Furthermore, the additional purification provided by post-filters reduces impurities and substances in the water that could be harmful to downstream equipment (such as water dispensers and electric kettles), thereby extending the lifespan of these devices. Due to the presence of the post-filter, the frequency of subsequent equipment cleaning and maintenance will be reduced accordingly, thereby reducing the costs caused by equipment failure or maintenance.

[0038] In order to reduce the overall volume of the water purification equipment, filter elements with different functions will be integrated into a composite element, that is, the pre-filter element, reverse osmosis filter element and post-filter element will be integrated into a composite filter element; considering that the service life of the pre-filter element, post-filter element and reverse osmosis filter element is quite different, there is currently a composite filter element that can remove the pre-filter element and post-filter element from the reverse osmosis filter element separately. Existing reverse osmosis filter cartridges are generally roll-type filter cartridges, formed by rolling up a reverse osmosis membrane. These roll-type filter cartridges have a gap through which water can flow in and out. In the prior art, water filtered through the reverse osmosis filter cartridge is referred to as pure water, water not yet filtered by the reverse osmosis filter cartridge is referred to as raw water, and water with a higher ion concentration retained during the filtration process is referred to as wastewater. Roll-type reverse osmosis filter cartridges are generally hollow, with gaps between adjacent membranes. Raw water enters the gaps between the membranes from one end of the roll-type filter cartridge. Under pressure, the water then passes through the reverse osmosis membrane to form pure water. Solutes, such as ions, in the water remain in the gaps within the reverse osmosis filter cartridge, while ions retained in the reverse osmosis filter cartridge mix with the raw water that is subsequently filtered. As the reverse osmosis filtration process continues, some water with a higher ion concentration is squeezed out of the gaps by the inlet pressure of the raw water, forming wastewater. Consequently, the water pressure remains high during the filtration process of the reverse osmosis filter cartridge.

[0039] In order to avoid water leakage or cross contamination, the detachable design requires the detachable parts or related structures to be as simple as possible to reduce the difficulty of sealing; thus, the detachable setting of the post-filter element requires the water path between the reverse osmosis filter element and the post-filter element to be as simple as possible. Therefore, the detachable setting will make the post-filter element easily directly impacted by the water flowing out of the reverse osmosis filter element, which may easily cause damage to the post-filter element structure.

[0040] Reference Figures 1 to 3In order to solve the above problems, the present invention proposes a detachable filter assembly, which can meet the detachable requirements and replace the pre-filter element 27 and / or post-filter element 21, while reducing the impact of the reverse osmosis filter element 12 on the post-filter element 21 after the water comes out, thereby ensuring the structural integrity of the post-filter element 21; the detachable filter assembly proposed by the present invention includes a first filter bottle 1, a first central tube 11 and a reverse osmosis filter element 12, the first central tube 11 is coaxially arranged in the first filter bottle 1, and the reverse osmosis filter element 12 is arranged between the first central tube 11 and the first filter bottle 1; a second filter bottle 2 is detachably arranged in the first central tube 11, and the water outlet side of the reverse osmosis filter element 12 is communicated with the bottom of the second filter bottle 2; specifically, a post-filter element 21 is coaxially arranged in the second filter bottle 2, the post-filter element 21 is hollow, and a lower end cover 22 is provided at the bottom of the post-filter element 21, and a first space is formed between the lower end cover 22 and the bottom surface of the second filter bottle 2 A water flow gap 23 is formed between the post-filter element 21 and the inner wall of the second filter bottle 2. A second central tube 3 is provided in the post-filter element 21. The second central tube 3 is communicated with the pure water outlet side of the post-filter element 21, and a clean water gap 31 is formed between the second central tube 3 and the lower end cover 22. After the water passes through the reverse osmosis filter element 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 flow gap 23, and then enter the second water flow gap 24. After being filtered by the post-filter element 21, it passes through the clean water gap 31 and is discharged through the second central tube 3. The setting of the first water flow gap 23 and the second water flow gap 24 actually reduces the flow cross-section of the water after entering the second filter bottle 2, thereby limiting the flow of water, thereby reducing the possibility of the torrent caused by excessive water pressure damaging the post-filter element 21, and ensuring the structural integrity of the post-filter element 21.

[0041] Reference Figures 2 to 5In the present invention, a partition 32 is provided on the outer periphery of the second central tube 3, and the partition 32 is used to separate the internal space of the second filter bottle 2; specifically, the partition 32 divides the second filter bottle 2 into an upper chamber 25 and a lower chamber 26, and the post filter element 21 is arranged in the lower chamber 26; since the post filter element 21 is hollow, the second central tube 3 is actually inserted into the post filter element 21, and thus, the second central tube 3 can actually play a certain supporting role for the post filter element 21; specifically, the lower end cover 22 is fixed to the bottom of the post filter element 21, and the top of the post filter element 21 is fixedly connected to the partition 32, so the post filter element 21 is actually fixed between the lower end cover 22 and the partition 32 The outer periphery of the lower end cover 22 is provided with a fixing ring 222, which is used to fix the post-filter element 21; due to the setting of the first water-passing gap 23 and the second water-passing gap 24, water actually penetrates from the outer periphery of the post-filter element 21 to the inner ring of the post-filter element 21 to complete the filtration, so during the filtration process, the post-filter element 21 is actually always subjected to the impact of the water flow; the setting of the second central tube 3 can not only discharge the water filtered by the post-filter element 21 out of the second filter bottle 2, but also the setting of the second central tube 3 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 the impact of the water flow 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 will be as flush as possible with the end surface of the bottom end of the post-filter element 21; a plurality of annular latch teeth 223 are provided on the upper end surface of the lower end cover 22, so that when the lower end cover 22 is fixed to the bottom end of the post-filter element 21, there is actually still a gap between the lower end cover 22 and the post-filter element 21, that is, there is still a gap between the second central tube 3 and the lower end cover 22, and this gap is the clean water gap 31; but in the actual filtering process, the clean water gap 31 is too small, so the water flow that can pass through the clean water gap 31 is also small. The size of the water channel 311 is relatively small, which limits the filtration efficiency of the post-filter element 21; therefore, in order to improve the water flow efficiency of the clean water gap 31 while maintaining the support of the second central tube 3 on the post-filter element 21, a plurality of water channels 311 are opened on the bottom end of the second central tube 3, and the water channels 311 are also part of the clean water gap 31. Therefore, the opening of the water channels 311 actually expands the flow cross-section of the clean water gap 31, thereby increasing the flow volume of the clean water gap 31 per unit time, that is, increasing the water output of the post-filter element 21, ensuring the structural integrity of the post-filter element 21, and improving the filtration efficiency of the overall structure.

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

[0044] Reference Figures 3 to 7 In the present invention, considering that the reverse osmosis filter element 12 is arranged between the first filter bottle 1 and the first central tube 11, in order to reduce the redundant flow path setting, that is, to simplify the flow path, it is necessary to directly introduce the water filtered by the reverse osmosis filter element 12 into the bottom end of the second filter bottle 2; for this purpose, a support plate 13 is provided in the first central tube 11, and the support plate 13 is used to provide support for the second filter bottle 2, and a water passage 131 is formed in the hollow space of the support plate 13, and a connecting portion 132 is protruded on the surface of the support plate 13 facing the second filter bottle 2. The connecting portion 1 32 is also hollow, and the connecting portion 132 is connected to the second filter bottle 2; the setting of the support plate 13 can provide support for the second filter bottle 2 while the water passage 131 and the connecting portion 132 thereon 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 while introducing water filtered by the reverse osmosis filter element 12 into the second filter bottle 2, that is, the support plate 13 has the functions of support and diversion at the same time, which reduces the flow path design and makes the overall structure more streamlined and more integrated.

[0045] Reference Figures 3 to 7 Correspondingly, the bottom of the second filter bottle 2 protrudes toward the support plate 13 to form an embedding portion 28. The embedding portion 28 is embedded in the connecting portion 132 and is hollow. Thus, the embedding portion 28 can connect the connecting portion 132 with the second filter bottle 2, that is, water in the connecting portion 132 can enter the second filter bottle 2 through the embedding portion 28. The provision of the embedding portion 28 on the second filter bottle 2 is actually to cooperate with the connecting portion 132 to introduce water into the second filter bottle 2. Considering the provision of the connecting portion 132, if a notch is provided on the second filter bottle 2 for the connecting portion 132 to be inserted, it may be necessary to provide relevant structures in the second filter bottle 2 to guide the water flow, which will increase the design difficulty of the interior of the second filter bottle 2 and is not conducive to the smooth flow of water. The provision of the embedding portion 28 can introduce water into the second filter bottle 2 without increasing the internal structure of the second filter bottle 2. While introducing water into the second filter bottle 2, the embedding portion 28 actually provides support for the second filter bottle 2 as a whole by cooperating with the connecting portion 132.

[0046] It should be noted that the setting of the embedded portion 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 to make the second filter bottle 2 not easy to shake in the first central tube 11; the specific dimensions are not repeated here, and it is sufficient to meet the above requirements; thus, the first central tube 11 can limit the second filter bottle 2, that is, the first central tube 11 can limit the movement direction of the second filter bottle 2 therein, so that the second filter bottle 2 can only move up and down; further, 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 the second filter bottle 2 is fixed. When the second filter bottle 2 is removed, the user can directly pull the second filter bottle 2 out of the first central tube 11, so that the embedded portion 28 is separated from the communicating portion 132, and the disassembly of the second filter bottle 2 is completed; the cooperative arrangement of the communicating portion 132 and the embedded portion 28 enables the second filter bottle 2 to meet the demand of being detachable and replaceable while reducing the internal flow path design and improving the integrity of the overall structure.

[0047] Reference Figures 3 to 7 2 and 132, and the sealing ring 282 is pressed between the second filter bottle 2 and the connecting portion 132. In the present invention, two sealing grooves 281 are provided on the outer periphery of the embedding portion 28 , and a sealing ring 282 is provided in each sealing groove 281 to improve the sealing performance between the embedding portion 28 and the communicating portion 132 .

[0048] Reference Figures 3 to 7, It should be noted that the provision of the sealing ring 282 can also provide a fixation for the connection between the embedded portion 28 and the communicating portion 132; in the process of embedding the embedded portion 28 into the communicating portion 132, the sealing ring 282 will be squeezed and deformed, which is equivalent to providing resistance between the communicating portion 132 and the embedded portion 28; when the communicating portion 132 is separated from the embedded portion 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 to detach from the communicating portion 132 due to the impact of the water pressure. Therefore, the resistance provided by the sealing ring 282 can well overcome this tendency, so that the embedded portion 28 is still embedded in the communicating portion 132, thereby avoiding the possibility of loose connection between the embedded portion 28 and the communicating portion 132.

[0049] In addition, it needs to be further explained that a pre-filter element 27 can be set in the upper cavity 25 of the second filter bottle 2, that is, the second filter bottle 2 is provided with 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 by the present invention; and the setting of the pre-filter element 27 not only further improves the integration of the overall structure, but also can 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, and the post-filter element 21 takes in water from the bottom of the second filter bottle 2, so the water inlet pressures of the two can offset each other. In combination with the above description of the first water flow gap 23 and the second water flow gap 24, it should be noted that when the upper chamber 25 is provided with a pre-filter element 27, the setting of the first water flow gap 23, the second water flow gap 24 and the clean water gap 31 actually offsets the pressure difference of the pre-filter element 27 on the post-filter element 21; specifically, when water flows through the first water flow gap 23 and the second water flow gap 24, it will exert pressure on the lower end cover 22 and the partition 32 respectively, and the pre-filter element 27 will exert pressure on the partition 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 are offset.

[0050] Reference Figures 3 to 7 Correspondingly, a front water inlet channel 201, a front water outlet channel 202 and a rear water outlet channel 203 are integrally formed on the top of the second filter bottle 2, and the second central tube 3 passes through the front filter element 27 and is sealedly connected 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 arranged at the top of the second central tube 3, that is, the above three are all arranged 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 element 27, a pre-limiting ring can be set on the top surface of the partition 32. The pre-limiting ring is used to limit the pre-filter element 27 to prevent the pre-filter element 27 from swinging, so as to ensure the filtering effect of the pre-filter element 27 on water.

[0052] Reference Figures 3 to 7 , further based on the setting of the pre-filter element 27, it is necessary to seal and isolate the pre-filter element 27 from the post-filter element 21 to avoid cross contamination between the two; to this end, at least one annular groove 322 is opened on the outer periphery of the separator 32, and at least one sealing member 321 is provided in the annular groove 322. The sealing member 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 member 321 can provide a seal for the separator 32, thereby avoiding cross-flow between the upper chamber 25 and the lower chamber 26 and causing cross contamination of water.

[0053] In order to further fix the post-filter element 21, a post-limiting ring 323 is provided on the bottom surface of the partition 32, and the post-limiting ring 323 is used to limit the post-filter element 21. In combination 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 post-limiting ring 323 actually limits 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 easily displaced, so as to ensure its filtering effect on water; in addition, the fixing ring 222, the post-limiting ring 323 and the second center tube 3 jointly support the post-filter element 21, further reducing the possibility of structural damage of the post-filter element 21 during the filtration process, and ensuring the service life of the post-filter element 21.

[0054] The present utility model also proposes a water purification device, and the second subject includes the above-mentioned detachable filter assembly. The specific structure of the detachable filter assembly refers to the above-mentioned embodiment. Since the present water purification device adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here one by one.

[0055] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. All 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 application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A detachable filter assembly, characterized in that: include First filter bottle; a first central tube, the first central tube being coaxially disposed in the first filter bottle; a reverse osmosis filter element, the reverse osmosis filter element being disposed between the first central tube and the first filter bottle; a second filter bottle, the second filter bottle being detachably disposed in the first central tube, the water outlet side of the reverse osmosis filter element being in communication with the bottom of the second filter bottle; In which, a post-filter element is coaxially arranged in the second filter bottle, the post-filter element is hollow, and a lower end cover is arranged at the bottom of the post-filter element. A first water flow gap is formed between the lower end cover and the bottom surface of the second filter bottle, and a second water flow gap is formed between the post-filter element and the inner wall of the second filter bottle. A second center tube is arranged in the post-filter element, the second center tube is communicated with the pure water outlet side of the post-filter element, and a clean water gap is formed between the second center tube and the lower end cover; the first water flow gap is communicated with the second water flow gap, and the water filtered by the post-filter element passes through the clean water gap and enters the second center tube.

2. The detachable filter assembly according to claim 1, wherein: A partition is provided on the outer periphery of the second central tube, and the partition divides the inner space of the second filter bottle into an upper chamber and a lower chamber, and the post-filter element is provided in the lower chamber.

3. The detachable filter assembly according to claim 2, wherein: A fitting portion is protrudingly formed on the top surface of the lower end cover, and the fitting portion extends into the second center tube.

4. The detachable filter assembly according to any one of claims 2 to 3, characterized in that: A support plate is provided in the first central tube, and the support plate is used to provide support for the second filter bottle.

5. The detachable filter assembly according to claim 4, wherein: A water passage is provided in the support plate, and a communication portion is protruding from the surface of the support plate facing the second filter bottle. The communication portion is hollow and communicates with the second filter bottle.

6. The detachable filter assembly according to claim 5, wherein: The bottom of the second filter bottle protrudes toward the support plate to form an embedding portion, which is embedded in the connecting portion. The embedding portion is hollow and is used to connect the connecting portion and the second filter bottle.

7. The detachable filter assembly according to claim 4, wherein: A sealing member is provided on the outer periphery of the partition, and the sealing member is pressed between the inner wall of the second filter bottle and the outer periphery of the partition.

8. The detachable filter assembly according to claim 7, wherein: A rear limiting ring is provided on the bottom surface of the separator, and the rear limiting ring is used to limit the rear filter element.

9. The detachable filter assembly according to claim 7, wherein: A pre-filter element is provided in the upper cavity, and a pre-limiting ring is provided on the top surface of the partition, and the pre-limiting ring is used to limit the pre-filter element.

10. The detachable filter assembly according to claim 4, wherein: A fixing ring is provided on the outer periphery of the lower end cover, and the fixing ring is used to fix the post-filter element.

11. A water purification device, characterized in that: Comprising the detachable filter assembly according to any one of claims 1 to 10.

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