Detachable filtering assembly

Abstract

The invention 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 invention, 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 invention relates to the technical field of water purification equipment, and in particular to a detachable filter element. 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 can easily damage the post-filter structure. Summary of the invention

[0003] The main purpose of the present invention 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 object, the detachable filter assembly proposed by 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, wherein the reverse osmosis filter element is 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 top of the second filter bottle being integrally formed with a rear water outlet channel, and the water outlet side of the reverse osmosis filter element being in communication with the bottom of the second filter bottle;

[0009] Among them, a post-filter element is coaxially arranged in the second filter bottle, the post-filter element is hollow, a lower end cover is arranged at the bottom of the post-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 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, a clean 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 post-filter element passes through the clean water gap into the second center tube, and the second center tube is communicated with the post-water outlet channel.

[0010] In one embodiment, a partition is disposed 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 disposed 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 protrudingly 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 toward the support plate to form an embedding portion, the embedding portion is embedded in the connecting portion, the embedding portion is hollow, and the embedding portion is used to connect the connecting portion and the second filter bottle.

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

[0017] In one embodiment, a pre-filter element is disposed in the upper cavity, and a pre-limiting ring is disposed 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 present invention also provides a water purification device, comprising the above-mentioned detachable filter assembly.

[0020] The technical solution of the present invention adopts a lower end cover arranged in the second filter bottle, and then the lower end cover cooperates with 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 drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 creative work.

[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 a detachable filter assembly provided by the present invention;

[0024] Figure 3 for Figure 2 A magnified view of part A;

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

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

[0027] Figure 6 It is an exploded schematic diagram of the front filter element, the rear filter element and the second central tube;

[0028] Figure 7 It is a 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 center 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 clamping gear; 23. First water gap; 24. Second water gap; 25. Upper cavity; 26. Lower cavity; 27. Front filter element; 28. Embedding part; 281. Sealing groove; 282. Sealing ring; 3. Second center tube; 311. Water passage; 31. Clean water gap; 32. Separator; 321. Seal; 322. Ring groove; 323. Rear limit ring; 324. Front limit 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 described embodiments 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 creative work 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 position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication 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 used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. 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 contradictory or cannot be implemented, it should be deemed that such 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] The pre-filter element refers to the filter element that preferentially filters water in the water system of the water purification equipment. The post-filter element is located downstream of the pre-filter element in the water system. It can directly filter the water after the pre-filter element is filtered, or it can filter the water that is first filtered by the pre-filter element and then filtered by other filters (such as reverse osmosis filters). The pre-filter element can protect the reverse osmosis filter element with higher precision; at the same time, it removes residual chlorine to prevent residual chlorine from damaging the reverse osmosis membrane; the pre-filter element can also absorb some organic matter in the water to achieve better filtering effect. Specifically, the pre-filter element can filter large particles of impurities in the water, effectively remove large particles of impurities such as sediment, rust, insect eggs, and suspended matter in the water, and ensure the initial purification of the water quality entering the home. If these impurities enter the water purification equipment directly, they are prone to blockage and wear. The use of the pre-filter element can effectively protect these devices from damage. Through the preliminary filtration of the pre-filter element, the filtration burden of subsequent water purification equipment (such as water purifiers, pure water machines, etc.) can be greatly reduced, thereby extending the service life of these equipment. Due to the presence of the pre-filter, the frequency of filter replacement of subsequent water purification equipment will be reduced accordingly, thereby reducing the cost of frequent filter replacement. In addition, the pre-filter can also improve water quality. The impurity content of water filtered by the pre-filter is greatly reduced, and the water quality is significantly improved. At the same time, the pre-filter can reduce the turbidity in the water and reduce the possibility of bacterial growth, thereby effectively reducing secondary pollution in water pipes, water tanks and other places. Some pre-filters also have anti-scaling functions. For example, the use of anti-scaling filters containing hydrochloric acid and phosphorus can reduce the formation of scale inside the equipment.

[0037] The post-filter can further purify the water and remove the residual impurities in the water, that is, the post-filter can further remove the tiny impurities, odors and colors that may remain in the water after being treated by the pre-filter and the main filter (such as RO reverse osmosis membrane). These impurities may include tiny suspended matter, organic compounds, etc. The post-filter, especially the activated carbon filter, can effectively absorb the odor and residual chlorine in the water, making the treated water taste more refreshing and sweet. This is particularly important for improving the quality of drinking water. In some cases, the water treated by the RO reverse osmosis membrane may be acidic to a certain extent. Certain components in the post-filter (such as certain minerals) can help adjust the water quality to make it closer to neutral or suitable for drinking pH. Some post-filters are also designed to increase the mineral content in the water to meet the needs of specific people for mineral water. In addition, through further purification of the post-filter, impurities and substances in the water that are harmful to subsequent equipment (such as water dispensers, electric kettles, etc.) can be reduced, thereby extending the service life of these equipment. 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 size of the water purification equipment, filter elements with different functions will be integrated into one, 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 the reverse osmosis filter element is quite different, there is currently a composite filter element that can separately remove the pre-filter element and post-filter element from the reverse osmosis filter element. The existing reverse osmosis filter element is generally a roll filter element, that is, the reverse osmosis filter membrane is rolled into a roll to form a filter element; the roll filter element has a gap for water inlet and outlet. In the prior art, water filtered through the reverse osmosis filter element is called pure water, water not filtered by the reverse osmosis filter element is called raw water, and water with a high ion concentration intercepted during the filtration process of the reverse osmosis filter element is called waste water; the roll reverse osmosis filter element is generally hollow, and there is a gap between adjacent membranes. The raw water enters the gap between the membranes from one end of the roll filter element, and then the water passes through the reverse osmosis filter membrane under pressure to form pure water, and the ions and other solutes in the water will remain in the gap of the reverse osmosis filter element, and the ions retained in the reverse osmosis filter element will be mixed with the subsequent raw water; as the reverse osmosis filtration process continues, some water with a high ion concentration will be squeezed out of the gap under the inlet pressure of the raw water to form waste water; it can be seen that during the filtration process of the reverse osmosis filter element, the water pressure is always high.

[0039] In order to avoid water leakage or cross contamination, the detachable design will require 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 will require 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, and thus easily cause damage to the structure of the post-filter element.

[0040] Reference Figures 1 to 3In order to solve the above problems, the present invention proposes a detachable filter component, which can reduce the impact of the reverse osmosis filter element 12 on the post-filter element 21 after the water outlet is replaced to meet the detachable requirements, thereby ensuring the structural integrity of the post-filter element 21; the detachable filter component 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 arranged at the bottom of the post-filter element 21, and a first water-passing space is formed between the lower end cover 22 and the bottom surface of the second filter bottle 2 A second water gap 23 is formed between the rear filter element 21 and the inner wall of the second filter bottle 2. A second central tube 3 is arranged in the rear filter element 21. The second central tube 3 is communicated with the pure water outlet side of the rear filter element 21, and a clean water gap 31 is formed between the second central tube 3 and the lower end cover 22. When water is filtered by 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 gap 23, and then enter the second water gap 24. After being filtered by the rear filter element 21, it will pass through the clean water gap 31 and be discharged through the second central tube 3. The setting of the first water gap 23 and the second water gap 24 actually reduces the flow cross-section of the water flow after entering the second filter bottle 2, thereby limiting the flow of water, thereby reducing the possibility of damaging the rear filter element 21 due to the torrent caused by excessive water pressure, and ensuring the structural integrity of the rear 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 ; A fixing ring 222 is provided on the outer periphery of the lower end cover 22, and the fixing ring 222 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; in addition to the setting of the second central tube 3 to discharge the water filtered by the post-filter element 21 out of the second filter bottle 2, the setting of the second central tube 3 inserted in 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 with the end face of the bottom end of the post-filter element 21 as possible; a plurality of annular latch teeth 223 are provided on the upper end face 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 rate that can pass through the clean water gap 31 is also too small. The second central tube 3 is provided with a plurality of water channels 311, and the water channels 311 are also components of the clean water gap 31. Thus, the provision 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, thereby 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 protrudingly formed on 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, thereby 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 arranged 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 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, and the connecting portion 13 2 is also hollow, and the connecting portion 132 is connected to the second filter bottle 2; the support plate 13 can provide support for the second filter bottle 2, and 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 and introduce 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 supporting and guiding 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, which is embedded in the connecting portion 132, and the embedding portion 28 is hollow, so that the embedding portion 28 can connect the connecting portion 132 and the second filter bottle 2, that is, the water in the connecting portion 132 can enter the second filter bottle 2 through the embedding portion 28; the setting 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 setting of the connecting portion 132, if the second filter bottle 2 is provided with a relevant notch for the connecting portion 132 to be embedded, it may be necessary to set a relevant structure 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 setting 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, and while the embedding portion 28 introduces water into the second filter bottle 2, its cooperation with the connecting portion 132 actually also provides support for the second filter bottle 2 as a whole.

[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 required that the second filter bottle 2 is not easy to shake in the first central tube 11; the specific dimensions are no longer 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 it up and down, and in order to reduce unnecessary flow path settings, the second filter bottle 2 is required to be fixed after the second filter bottle 2 is fixed. While being fixedly connected, it also conducts the water path connected to the first filter bottle 1; in summary, the cooperation of the embedded portion 28 and the connecting portion 132 can meet the above requirements; when the embedded portion 28 and the connecting portion 132 are in a connected state, that is, when the embedded portion 28 is embedded in the connecting portion 132, the water filtered by the reverse osmosis filter element 12 in the first filter bottle 1 can directly enter the second filter bottle 2, and then be filtered by the post-filter element 21; and 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 portion 28 is separated from the connecting portion 132, and the disassembly of the second filter bottle 2 can be completed; the cooperation between the connecting portion 132 and the embedded portion 28 enables the second filter bottle 2 to meet the requirement of detachable replacement while reducing the internal flow path design and improving the integrity of the overall structure.

[0047] Reference Figures 3 to 7 Accordingly, in order to seal when the embedded portion 28 is connected to the connecting portion 132, that is, to prevent water from overflowing from the connection between the two, at least one sealing groove 281 is provided on the outer periphery of the embedded portion 28, and a sealing ring 282 is provided in the sealing groove 281, and the sealing ring 282 is crimped between the embedded portion 28 and the connecting portion 132; the setting of the sealing ring 282 provides a seal between the embedded portion 28 and the connecting portion 132, thereby reducing the possibility of water overflowing from between the embedded portion 28 and the connecting portion 132, and ensuring the sealing of the overall structure; in addition, the setting of the sealing ring 282 can also prevent external impurities from entering between the embedded portion 28 and the connecting portion 132, that is, the sealing ring 282 can prevent external impurities from entering between the embedded portion 28 and the connecting portion 132 while preventing water from overflowing, thereby preventing the possibility of external impurities from entering between the embedded portion 28 and the connecting portion 132, thereby preventing the possibility of external impurities from entering into the second filter bottle 2 through the gap between the embedded portion 28 and the connecting portion 132, and further preventing the possibility of water being contaminated by external impurities. In the present invention, two sealing grooves 281 are disposed on the outer periphery of the embedding portion 28 , and a sealing ring 282 is disposed 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 7It should be noted that the setting of the sealing ring 282 can also provide fixation for the connection between the embedded portion 28 and the connecting portion 132; in the process of the embedded portion 28 being embedded in the connecting portion 132, the sealing ring 282 will be squeezed and deformed, which is equivalent to providing resistance between the connecting portion 132 and the embedded portion 28; when the connecting 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 escape from the connecting portion 132 due to the impact of the water pressure, so the resistance provided by the sealing ring 282 can well overcome this tendency, so that the embedded portion 28 is still embedded in the connecting portion 132, avoiding the possibility of loose connection between the embedded portion 28 and the connecting portion 132.

[0049] In addition, it needs to be further explained that a pre-filter element 27 can be arranged 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 arrangement 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, water will exert pressure on the lower end cover 22 and the partition 32 respectively when flowing through the first water flow gap 23 and the second water flow gap 24, while the pre-filter element 27 will exert pressure on the partition 32 during the filtration process. Based on this, the pressure of the water inlet of the post-filter element 21 and the water inlet of the pre-filter element 27 offset each other.

[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 at the top of the second filter bottle 2, and the second center tube 3 passes through the front filter element 27 and is sealed and connected with 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 center 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 the additional water channel 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, and 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 partition 32, and at least one sealing member 321 is arranged in the annular groove 322. The sealing member 321 is crimped between the inner wall of the second filter bottle 2 and the outer periphery of the partition 32, so that the sealing member 321 can provide sealing for the partition 32 to avoid cross contamination of water caused by cross flow between the upper chamber 25 and the lower chamber 26.

[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. 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 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 invention 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 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 only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied 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, wherein the reverse osmosis filter element is 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 top of the second filter bottle being integrally formed with a rear water outlet channel, and the water outlet side of the reverse osmosis filter element being in communication with the bottom of the second filter bottle; Among them, a post-filter element is coaxially arranged in the second filter bottle, the post-filter element is hollow, a lower end cover is arranged at the bottom of the post-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 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, a clean 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 post-filter element passes through the clean water gap into the second center tube, and the second center tube is communicated with the post-water outlet channel.

2. The detachable filter assembly according to claim 1, characterized in that: A partition is disposed 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 disposed in the lower chamber.

3. The detachable filter assembly according to claim 2, characterized in that: 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 arranged 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, characterized in that: A water passage is provided in the support plate, and a connecting portion is protrudingly 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.

6. The detachable filter assembly according to claim 5, characterized in that: 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 the embedding portion is used to connect the connecting portion and the second filter bottle.

7. The detachable filter assembly according to claim 4, characterized in that: A sealing member is disposed 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, characterized in that: A rear limiting ring is arranged on the bottom surface of the partition, and the rear limiting ring is used to limit the position of the rear filter element.

9. The detachable filter assembly according to claim 7, characterized in that: A pre-filter element is arranged in the upper cavity, and a pre-limiting ring is arranged 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, characterized in that: A fixing ring is arranged 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 a detachable filter assembly as claimed in any one of claims 1 to 10.

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