Filter element structure and water purifier

Abstract

The utility model belongs to the technical field of water purification equipment, and discloses a filter element structure and a water purifier. The filter element structure comprises a filter bottle, a central pipe assembly and a filter assembly, the primary filter unit is used for purifying raw water, adjusting the TDS value and forming purified water and concentrated water, and the purified water flows into the secondary filter unit and is separated to form low-calcium-magnesium-ratio water and high-calcium-magnesium-ratio water. According to the filter element structure, the first-stage filter unit, the first central pipe, the second-stage filter unit and the second central pipe are sequentially arranged in a sleeving manner from outside to inside, so that a filter assembly and a central pipe assembly are compounded and integrated into a whole, an integrated compound design is used for replacing a multi-stage split design of a filter element, the integration level of the filter element structure is improved, and the size of the filter element structure is reduced; according to the filter element structure, the primary filter unit is adopted for purifying raw water and adjusting the TDS value, the secondary filter unit is adopted for separating at least part of purified water generated by the primary filter unit to form water with the high calcium-magnesium ratio and water with the low calcium-magnesium ratio, and the obtaining mode of the water with the low calcium-magnesium ratio is safe and reliable.

Description

Technical Field

[0001] This utility model relates to the field of water purification equipment technology, and in particular to a filter element structure and a water purifier. Background Technology

[0002] Magnesium ions play a vital role in the human body, primarily by participating in catalytic enzyme reactions, enhancing muscle energy, promoting calcium absorption, regulating the nervous system, and protecting the cardiovascular system. Regarding magnesium's role in promoting the absorption of other ions, magnesium deficiency leads to potassium and calcium loss. Insufficient magnesium intake can easily cause hypomagnesemia, resulting in hypokalemia and hypocalcemia, while hypermagnesemia is very rare. Current water purifier filter structures have a high magnesium ion retention rate but a low calcium ion retention rate, resulting in a high calcium-to-magnesium ratio in the final water. Therefore, long-term consumption of water from water purifiers can easily lead to insufficient magnesium ion absorption. Current technologies generally introduce minerals into the water purification system artificially to increase magnesium ion content and thus lower the calcium-to-magnesium ratio. However, this method of lowering the calcium-to-magnesium ratio poses certain risks to hygiene and safety. Utility Model Content

[0003] The purpose of this utility model is to provide a filter element structure and a water purifier. This filter element structure not only has a high degree of integration, but also can produce purified water with a low calcium-magnesium ratio according to user needs, and the method of reducing the calcium-magnesium ratio is safe and reliable.

[0004] To achieve this objective, the present invention adopts the following technical solution:

[0005] A filter element structure includes: a filter bottle with an inlet; a central tube assembly disposed within the filter bottle, the central tube assembly including a first central tube and a second central tube, the first central tube being sleeved outside the second central tube, the first central tube having a first water passage penetrating the tube wall, and the second central tube having a second water passage penetrating the tube wall; and a filtration assembly disposed within the filter bottle, the filtration assembly including a primary filtration unit and a secondary filtration unit, the primary filtration unit being sleeved outside the first central tube, and the secondary filtration unit being sleeved between the first central tube and the second central tube, the inlet end of the primary filtration unit being connected to the inlet; the primary filtration unit is used to purify raw water and adjust the TDS value of the raw water, forming purified water, the purified water being able to flow to the secondary filtration unit through the first water passage; the secondary filtration unit is used to separate at least a portion of the purified water to form low calcium-magnesium ratio water and high calcium-magnesium ratio water, the high calcium-magnesium ratio water flowing to the second central tube through the second water passage, and the low calcium-magnesium ratio water being discharged from the outlet end of the secondary filtration unit.

[0006] Preferably, the filter bottle is further provided with a first water outlet, a second water outlet, and a third water outlet. The primary filtration unit also forms concentrated water, which flows to the first water outlet. The water outlet of the secondary filtration unit is connected to the second water outlet, and the water outlet of the second central tube is connected to the third water outlet. Alternatively, the top of the primary filtration unit forms the water inlet, the bottom of the primary filtration unit forms the water outlet, and a water inlet channel is formed between the outer wall of the primary filtration unit and the inner wall of the filter bottle, communicating with the water inlet. The filter bottle is also provided with a first water outlet, and the water outlet of the primary filtration unit is connected to the first water outlet. The outlet is connected; or, the top of the primary filtration unit forms an outlet, the bottom of the primary filtration unit forms an inlet, the filter bottle is also provided with a first outlet, a concentrated water outlet channel is formed between the outer wall surface of the primary filtration unit and the inner wall surface of the filter bottle, the concentrated water outlet channel is connected to the outlet of the primary filtration unit and the first outlet; and / or, the filter bottle is also provided with a fourth outlet, a purified water outlet channel is formed between the inner wall surface of the first central tube and the outer wall surface of the secondary filtration unit, the purified water outlet channel is connected to the fourth outlet, the first water passage channel and the second water passage channel.

[0007] Preferably, the primary filtration unit includes an RO membrane or a high-desalination nanofiltration membrane; and / or, the secondary filtration unit includes a salt separation nanofiltration membrane; and / or, the secondary filtration unit has a desalination rate of magnesium sulfate greater than or equal to 85%; and / or, the secondary filtration unit has a desalination rate of sodium chloride less than 50%; and / or, the secondary filtration unit has a desalination rate of calcium chloride less than 50%; and / or, the filtration assembly further includes a tertiary filtration unit, which is used to reduce the TDS value of the low calcium-magnesium ratio water, and the tertiary filtration unit is a desalination nanofiltration membrane or an RO membrane.

[0008] Preferably, one end of the first central tube is closed, the second central tube is placed inside the first central tube, and one end of the second central tube is detachably connected to the closed end of the first central tube.

[0009] Preferably, the filter element structure further includes a first support member disposed inside the filter bottle. The first support member includes a first support ring plate and a first annular side plate. The first annular side plate protrudes upward along the circumference of the first support ring plate to form a first mounting cavity. The water outlet end of the primary filtration unit is inserted into the first mounting cavity. Alternatively, the filter element structure further includes a second support member disposed inside the filter bottle. The second support member includes a second support ring plate and a second annular side plate. The second annular side plate protrudes upward along the circumference of the second support ring plate to form a second mounting cavity. The water outlet end of the secondary filtration unit is inserted into the second mounting cavity.

[0010] Preferably, the filter element structure further includes a main support member, which is fixed inside the filter bottle. The main support member supports the central tube assembly and the filter assembly. The main support member is provided with a first flow channel, a second flow channel, a third flow channel, a fourth flow channel, and a fifth flow channel that are independent of each other. The first flow channel connects the water inlet and the water inlet channel. The second flow channel connects the water outlet of the primary filtration unit with the first water outlet. The third flow channel connects the water outlet of the secondary filtration unit with the second water outlet. The fourth flow channel connects the water outlet of the second central tube with the third water outlet. The fifth flow channel connects the purified water outlet channel with the fourth water outlet.

[0011] Preferably, the main support includes a first tubular portion, which is inserted into the outlet end of the first central tube; and / or, the main support includes a second tubular portion, which is inserted into the outlet end of the second central tube; and / or, the main support includes a third tubular portion, and the filter element structure further includes a first support member, which supports the primary filtration unit, and includes a third annular side plate, which is inserted into the third tubular portion; and / or, the main support includes a fourth tubular portion, and the filter element structure further includes a second support member, which supports the secondary filtration unit, and includes a fourth annular side plate, which is inserted into the fourth tubular portion; and / or, a support surface is formed inside the filter bottle, and the main support includes an annular overlapping portion that overlaps the support surface.

[0012] Preferably, the first flow channel includes a first water passage hole that passes through the annular overlapping portion; the main support also includes a protruding connecting portion located below the annular overlapping portion, the first flow channel also includes a second water passage hole located on the protruding connecting portion, and a water passage gap located on the side of the protruding connecting portion, below the annular overlapping portion, and between the inner wall of the filter bottle, the first water passage hole, the water passage gap, the second water passage hole, and the water inlet are connected in sequence.

[0013] Preferably, the main support further includes a first annular portion disposed between the first tubular portion and the third tubular portion, and the second flow channel includes a third water passage hole disposed on the first annular portion; the main support further includes a protruding connecting portion disposed below the annular overlapping portion, and the second flow channel further includes a fourth water passage hole disposed on the protruding connecting portion, the third water passage hole, the fourth water passage hole, and the first outlet being sequentially connected; and / or, the main support further includes a second annular portion disposed between the first tubular portion and the fourth tubular portion, the... The third flow channel includes a fifth water passage hole disposed on the second annular portion, the fifth water passage hole communicating with the second outlet; and / or, the main support member further includes a third annular portion disposed between the second tubular portion and the fourth tubular portion, the fifth flow channel including a sixth water passage hole disposed on the third annular portion, the sixth water passage hole communicating with the fourth outlet; and / or, the main support member further includes a fourth annular portion disposed within the second tubular portion, the fourth annular portion forming a seventh water passage hole, the seventh water passage hole communicating with the third outlet.

[0014] A water purifier includes a housing and the aforementioned filter element structure, wherein the filter element structure is disposed within the housing.

[0015] The beneficial effects of this utility model are:

[0016] The filter element structure provided by this utility model includes a filter bottle, a central tube assembly, and a filter assembly. This filter element structure integrates the filter assembly and the central tube assembly into one unit by sequentially nesting the primary filtration unit, the first central tube, the secondary filtration unit, and the second central tube from the outside in. This integrated composite design replaces the multi-stage separate design of the filter element, improving the integration of the filter element structure and reducing its volume. The primary filtration unit of this filter element structure purifies the raw water and adjusts the TDS value, while the secondary filtration unit separates at least a portion of the purified water produced by the primary filtration unit to form high calcium-magnesium ratio water and low calcium-magnesium ratio water. The method of obtaining low calcium-magnesium ratio water is safe and reliable. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the filter element structure of this utility model;

[0018] Figure 2 This is a bottom view of the filter element structure of this utility model;

[0019] Figure 3 yes Figure 2 A cross-sectional view along the AA direction;

[0020] Figure 4 yes Figure 2 Cross-sectional view along the BB direction;

[0021] Figure 5 This is an exploded view of the filter bottle with the filter element structure of this utility model;

[0022] Figure 6 This is a schematic diagram of the first central tube of this utility model;

[0023] Figure 7 This is a cross-sectional view of the first central tube of this utility model;

[0024] Figure 8 This is a schematic diagram of the second central tube of this utility model;

[0025] Figure 9 This is a schematic diagram of the first support member of this utility model;

[0026] Figure 10 This is a cross-sectional view of the first support member of this utility model;

[0027] Figure 11 This is a schematic diagram of the second support member of this utility model;

[0028] Figure 12 This is a cross-sectional view of the second support member of this utility model;

[0029] Figure 13 This is a schematic diagram of the main support component of this utility model;

[0030] Figure 14 This is a top view of the main support component of this utility model;

[0031] Figure 15 yes Figure 14 A cross-sectional view along the CC direction;

[0032] Figure 16 yes Figure 14 A cross-sectional view along the DD direction.

[0033] In the picture:

[0034] 10. Filter element structure;

[0035] 100. Filter bottle; 101. Inlet; 102. First outlet; 103. Second outlet; 104. Third outlet; 105. Fourth outlet;

[0036] 110. Bottle body; 111. Handle; 120. Cap;

[0037] 200. Central tube assembly; 210. First central tube; 211. First water passage; 212. Insertion hole; 213. Water passage groove; 220. Second central tube; 221. Second water passage;

[0038] 300. Filter assembly; 310. Primary filter unit; 320. Secondary filter unit;

[0039] 400, First support member; 410, First support ring plate; 420, First annular side plate; 430, Third annular side plate; 401, First mounting cavity;

[0040] 500, Second support member; 510, Second support ring plate; 520, Second annular side plate; 530, Fourth annular side plate; 501, Second mounting cavity;

[0041] 600. Main support component; 610. First tubular part; 620. Second tubular part; 630. Third tubular part; 640. Fourth tubular part; 650. Annular overlapping part; 660. Protruding connecting part; 601. First water passage hole; 602. Second water passage hole; 603. Third water passage hole; 604. Fourth water passage hole; 605. Fifth water passage hole; 606. Sixth water passage hole; 607. Seventh water passage hole. Detailed Implementation

[0042] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0043] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0044] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0045] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0046] like Figures 1 to 4 As shown, this utility model discloses a filter element structure 10, which is used in a water purifier to purify raw water into purified water that meets user needs. Specifically, the filter element structure 10 includes a filter bottle 100, a central tube assembly 200, and a filter assembly 300, both of which are located inside the filter bottle 100. The filter bottle 100 has an inlet 101 for supplying raw water. The central tube assembly 200 includes a first central tube 210 and a second central tube 220. The first central tube 210 is sleeved outside the second central tube 220. The first central tube 210 has a first water passage 211 penetrating the tube wall, and the second central tube 220 has a second water passage 221 penetrating the tube wall. The filter assembly 300 includes a primary filter unit 310 and a secondary filter unit 320. The primary filter unit 310 is sleeved outside the first central tube 210, and the secondary filter unit 320 is sleeved between the first central tube 210 and the second central tube 220. That is, within the filter bottle 100, along the radial direction of the filter bottle 100, the primary filter unit 310, the first central tube 210, the secondary filter unit 320, and the second central tube 220 are nested sequentially from the outside to the inside.

[0047] The primary filtration unit 310 is used to purify the raw water and adjust its TDS (total dissolved solids) value, forming purified water. The purified water can flow through the first water passage 211 to the secondary filtration unit 320. The secondary filtration unit 320 is used to separate at least part of the purified water to form low calcium-magnesium ratio water and high calcium-magnesium ratio water. The high calcium-magnesium ratio water flows through the second water passage 221 to the second central pipe 220, and the low calcium-magnesium ratio water is discharged from the outlet of the secondary filtration unit 320.

[0048] The detailed process of this filter element structure purifying raw water is as follows: Figure 3 As shown, raw water enters the filter bottle 100 through the inlet 101 and flows upward through the inlet channel to the side wall of the primary filtration unit 310. The raw water then flows radially into the primary filtration unit 310, where it purifies the raw water and adjusts the TDS value. Specifically, this means reducing the TDS value of the raw water to the target range. Under the action of the primary filtration unit 310, harmful substances in the raw water are filtered out, forming concentrated water containing harmful substances and purified water without harmful substances. The concentrated water flows out from the outlet of the primary filtration unit 310 and finally exits from the first outlet... The water outlet 102 discharges from the filter element structure 10; purified water can continue to flow radially inward along the filter bottle 100 through the first water passage 211 and flow into the secondary filtration unit 320. The secondary filtration unit 320 has the ability to separate magnesium ions from calcium ions and sodium ions. Thus, the purified water entering the secondary filtration unit 320 can be separated into high calcium-magnesium ratio water and low calcium-magnesium ratio water under the action of the secondary filtration unit 320. The high calcium-magnesium ratio water continues to move radially and flows into the second central pipe 220 through the second water passage 221, and flows downward along the axial direction of the second central pipe 220, while the low calcium-magnesium ratio water... Figure 4 The water flows out from the outlet of the secondary filtration unit 320. It should be noted that the ratio of calcium ion content to magnesium ion content (referred to as calcium-magnesium ratio) in the two streams of purified water entering the secondary filtration unit 320 is different. The water stream with a high calcium-magnesium ratio is defined as high calcium-magnesium ratio water, and the water stream with a low calcium-magnesium ratio is defined as low calcium-magnesium ratio water. The specific values ​​of the calcium-magnesium ratio in high calcium-magnesium ratio water and low calcium-magnesium ratio water are not specifically limited.

[0049] Compared to the multi-stage, separate filter element structure used in existing technologies, the filter element structure 10 provided by this utility model adopts an integrated composite design, integrating the primary filtration unit 310 and the secondary filtration unit 320 into the same filter bottle 100. The primary filtration unit 310, the first central tube 210, the secondary filtration unit 320, and the second central tube 220 are sequentially nested from the outside to the inside within the filter bottle 100, thereby greatly improving the integration of the filter element structure 10, reducing the volume of the filter element structure 10, and simplifying the internal flow channels of the filter element structure 10. Furthermore, the filter element structure 10 employs a primary filtration unit 310 to purify the raw water and adjust its TDS value, while a secondary filtration unit 320 separates magnesium ions from calcium and sodium ions, thus creating both low-calcium-magnesium ratio water rich in magnesium ions and high-calcium-magnesium ratio water rich in calcium and sodium ions. Drinking water with a low calcium-magnesium ratio can effectively prevent hypomagnesemia, while drinking water with a high magnesium ion content can promote calcium ion absorption, thereby preventing hypocalcemia. Long-term consumption is beneficial for improving the user's physical condition. The high-calcium-magnesium ratio water can be returned to the inlet 101 for reuse or used in other situations. Moreover, compared to artificially adding minerals, directly utilizing the minerals in the raw water to obtain low-calcium-magnesium ratio water is safer and more reliable.

[0050] In some embodiments, the filter bottle 100 is further provided with a first outlet 102, a second outlet 103, and a third outlet 104. The first outlet 102, the second outlet 103, and the third outlet 104 are used for water discharge, and the water flowing out of the filter element structure 10 through different outlets has different water quality. Optionally, in addition to forming purified water, the primary filtration unit 310 also forms concentrated water. The concentrated water flows to the first outlet 102. The outlet end of the secondary filtration unit 320 is connected to the second outlet 103, and the outlet of the second central pipe 220 is connected to the third outlet 104. Low calcium-magnesium ratio water is discharged from the outlet end of the secondary filtration unit 320 and flows to the second outlet 103, and is finally discharged from the second outlet 103. High calcium-magnesium ratio water can flow through the second water passage 221 to the second central pipe 220, and is finally discharged from the third outlet 104.

[0051] In one specific embodiment, the top of the primary filtration unit 310 forms an inlet end, the bottom of the primary filtration unit 310 forms an outlet end, an inlet channel is formed between the outer wall surface of the primary filtration unit 310 and the inner wall surface of the filter bottle 100, the inlet channel is connected to the inlet 101, and the outlet end of the primary filtration unit 310 is connected to the first outlet 102. In a parallel embodiment, the top of the primary filtration unit 310 forms an outlet end, the bottom of the primary filtration unit 310 forms an inlet end, the filter bottle 100 is also provided with a first outlet 102, a concentrated water outlet channel is formed between the outer wall surface of the primary filtration unit 310 and the inner wall surface of the filter bottle 100, the concentrated water outlet channel connects the outlet end of the primary filtration unit 310 and the first outlet 102.

[0052] Furthermore, to enhance the functionality of the filter element structure 10, in some embodiments, the filter bottle 100 is also provided with a fourth outlet 105. A purified water outlet channel is formed between the inner wall of the first central tube 210 and the outer wall of the secondary filtration unit 320. The purified water outlet channel is connected to the fourth outlet 105, the first water passage 211, and the second water passage 221. This arrangement ensures that the purified water formed after filtration by the primary filtration unit 310 can... Figure 4 As shown, the purified water flows through the outlet channel to the fourth outlet 105 and is discharged from the fourth outlet 105. This arrangement helps to enrich the water output of the filter structure 10, allowing users to directly use the purified water flowing from the fourth outlet 105 as needed, making the filter structure 10 and the water purifier better meet the user's needs.

[0053] Continue to refer to Figure 1 and Figure 5 As shown, the filter bottle 100 includes a detachably connected bottle body 110 and a cap 120. One end of the bottle body 110 is closed, and the other end has an installation port. The cap 120 is detachably installed at the installation port and has an inlet 101, a first outlet 102, a second outlet 103, a third outlet 104, and a fourth outlet 105. Removing the cap 120 of the filter bottle 100 opens the installation port, allowing the central tube assembly 200 and the filter assembly 300 to be installed inside the bottle body 110 through the installation port.

[0054] Furthermore, a handle 111 is provided on the outer side of the closed end of the bottle body 110. The user can easily move the bottle body 110 by pinching the handle 111, thereby connecting the bottle body 110 to the cap 120. Optionally, the bottle body 110 and the cap 120 are detachably connected, and the detachable connection methods include, but are not limited to, threaded connection, snap-fit ​​connection, and screw connection. In a specific embodiment, the bottle body 110 and the cap 120 are interlocked, which provides high stability and high assembly efficiency.

[0055] Regarding the primary filtration unit 310, depending on the user's requirements for the TDS value of the effluent and the degree of water purification, it may include a high-desalination nanofiltration membrane or a reverse osmosis (RO) membrane to filter out harmful substances in the water and obtain purified water. Optionally, the recovery rate of the primary filtration unit 310 is 40%-85%. Optionally, the primary filtration unit 310 is in the shape of a cylindrical tube.

[0056] Regarding the secondary filtration unit 320, it separates purified water. The secondary filtration unit 320 has a low desalination rate for sodium chloride and calcium chloride, generally below 50%, but a high desalination rate for magnesium ions (mainly magnesium sulfate) in the water. In some embodiments, the secondary filtration unit 320 has a filtration function with a magnesium sulfate desalination rate ≥85%; in some embodiments, the secondary filtration unit 320 has a magnesium sulfate desalination rate ≥90%. Therefore, the secondary filtration unit 320 can perform secondary separation of magnesium ions (mainly magnesium sulfate), sodium ions (mainly sodium chloride), and calcium ions (mainly calcium chloride) in the water. The secondary filtration unit 320 preferably includes a salt-separating nanofiltration membrane. Of course, in other embodiments, other filter element structures 10 with magnesium ion separation functions can also be selected. In some embodiments, the recovery rate of the secondary filtration unit 320 is 5%-50%. Optionally, the secondary filtration unit 320 is in the shape of a cylindrical tube.

[0057] Furthermore, the filter assembly 300 also includes a three-stage filtration unit. This three-stage filtration unit is used to reduce the TDS value of the low calcium-magnesium ratio water. Optionally, the three-stage filtration unit can be a desalination nanofiltration membrane or a reverse osmosis membrane (RO membrane) to facilitate optimization according to different product water TDS requirements. Specifically, if the raw water quality is good, the low calcium-magnesium ratio water produced by the primary filtration unit 310 and the secondary filtration unit 320 can already meet the user's needs; however, if the raw water quality is poor, the low calcium-magnesium ratio water produced by the primary filtration unit 310 and the secondary filtration unit 320 can have its TDS value further reduced through the three-stage filtration unit to better meet the user's needs.

[0058] like Figure 4 , Figures 6 to 8 As shown, in some embodiments, one end of the first central tube 210 is closed, and the second central tube 220 is placed inside the first central tube 210, with one end of the second central tube 220 detachably connected to the closed end of the first central tube 210. Optionally, a insertion hole 212 is provided on the inner end face of the closed end of the first central tube 210, and the top end of the second central tube 220 is inserted into the insertion hole 212, thereby realizing the insertion fit between the first central tube 210 and the second central tube 220. Of course, in addition to the insertion fit, a threaded hole can also be formed on the inner side of the closed end of the first central tube 210, and the top end of the second central tube 220 can be threaded into the threaded hole.

[0059] Optionally, both the first central pipe 210 and the second central pipe 220 are circular pipes. Of course, besides circular pipes, the first central pipe 210 and the second central pipe 220 can also be pipes of other shapes. Optionally, multiple first water passages 211 are provided, and multiple sets of multiple first water passages 211 are spaced apart in the axial direction of the first central pipe 210. Each set of first water passages 211 includes multiple first water passages 211 spaced apart in the circumferential direction of the first central pipe 210. Optionally, multiple second water passages 221 are provided, and multiple sets of multiple second water passages 221 are spaced apart in the axial direction of the second central pipe 220. Each set of second water passages 221 includes multiple second water passages 221 spaced apart in the circumferential direction of the second central pipe 220.

[0060] Optionally, a water-passing groove 213 is provided on the wall of the first central pipe 210. By providing the water-passing groove 213, the purified water outlet channel formed between the first central pipe 210 and the secondary filtration unit 320 is widened, making it easier for purified water to enter the fourth outlet 105 through the purified water outlet channel. Further optionally, the water-passing groove 213 extends along the axial direction of the first central pipe 210; multiple water-passing grooves 213 are provided, and the multiple water-passing grooves 213 are spaced apart circumferentially within the first central pipe 210.

[0061] In order to stably fix the central tube assembly 200 and the filter assembly 300 within the filter bottle 100, in some embodiments, such as Figure 4 , Figures 13 to 16 As shown, the filter element structure 10 also includes a main support 600, which is fixed inside the filter bottle 100. The main support 600 is used to support the central tube assembly 200 and the filter assembly 300. The main support 600 is provided with a first flow channel, a second flow channel, a third flow channel, a fourth flow channel and a fifth flow channel that are independent of each other. The first flow channel connects the inlet 101 and the inlet channel. The second flow channel connects the outlet end of the primary filtration unit 310 with the first outlet 102. The third flow channel connects the outlet end of the secondary filtration unit 320 with the second outlet 103. The fourth flow channel connects the outlet of the second central tube 220 with the third outlet 104. The fifth flow channel connects the purified water outlet channel with the fourth outlet 105.

[0062] like Figure 15 and Figure 16 As shown, the main support member 600 includes a protruding connecting part 660, an annular overlapping part 650, and a pipe assembly part. The protruding connecting part 660 is used to connect multiple tubular parts of the pipe assembly part, and the annular overlapping part 650 protrudes horizontally outward along the circumference of the pipe assembly part.

[0063] To stably fix the main support 600 within the filter bottle 100 and facilitate integrated assembly and disassembly, a support surface is formed within the cover 120 of the filter bottle 100, and an annular overlapping portion 650 overlaps on this support surface. Optionally, a stepped surface is formed within the cover 120, and multiple support platforms are spaced apart on the horizontal annular surface of the stepped surface, with the top surface of each support platform forming a support surface. Further, a first connecting hole is provided on the annular overlapping portion 650, and a second connecting hole is provided on the support platform. A first connecting member passes through the first and second connecting holes, thereby fixing the main support 600 within the cover 120.

[0064] Optionally, the pipe assembly includes a first tubular section 610, which is inserted into the outlet end of the first central pipe 210. The insertion fit is highly stable and the assembly efficiency is high.

[0065] Optionally, the pipe assembly includes a second tubular section 620, which is inserted into the outlet end of the second central pipe 220. The insertion fit is highly stable and the assembly efficiency is high.

[0066] To stably support the primary filter unit 310, such as Figure 4 As shown, the filter element structure 10 also includes a first support member 400, which is disposed inside the filter bottle 100. The first support member 400 is used to support the primary filtration unit 310 and connect to the main support member 600. Optionally, as shown... Figure 9 and Figure 10 As shown, the first support member 400 includes a first support ring plate 410 and a first annular side plate 420. The first annular side plate 420 protrudes upward along the circumference of the first support ring plate 410 to form a first mounting cavity 401. The outlet end of the primary filter unit 310 is inserted into the first mounting cavity 401. Optionally, the first support member 400 further includes a third annular side plate 430. The third annular side plate 430 is disposed on the side of the first support ring plate 410 opposite to the first annular side plate 420, and the third annular side plate 430 is arranged along the circumference of the inner hole of the first support ring plate 410. The third annular side plate 430 is inserted into the third tubular part 630, which has high stability and high assembly efficiency.

[0067] To stably support the secondary filter unit 320, such as Figure 4 As shown, the filter element structure 10 also includes a second support member 500, which is disposed inside the filter bottle 100. The second support member 500 is used to support the secondary filtration unit 320 and connect to the main support member 600. Optionally, as shown... Figure 11 and Figure 12As shown, the second support member 500 includes a second support ring plate 510 and a second annular side plate 520. The second annular side plate 520 protrudes upward along the circumference of the second support ring plate 510 to form a second mounting cavity 501. The outlet end of the secondary filtration unit 320 is inserted into the second mounting cavity 501. Optionally, the second support member 500 further includes a fourth annular side plate 530. The fourth annular side plate 530 is disposed on the side of the second support ring plate 510 opposite to the second annular side plate 520, and the fourth annular side plate 530 is arranged along the circumference of the inner hole of the second support ring plate 510. The fourth annular side plate 530 is inserted into the fourth tubular part 640, which has high stability and high assembly efficiency.

[0068] It should be noted that the tubular assembly includes a third tubular portion 630, a first tubular portion 610, a fourth tubular portion 640, and a second tubular portion 620, which are sequentially fitted from the outside in. The protruding connecting portion 660 includes a first annular portion, a second annular portion, a third annular portion, and a fourth annular portion. The first annular portion connects the first tubular portion 610 and the third tubular portion 630, the second annular portion connects the first tubular portion 610 and the fourth tubular portion 640, the third annular portion connects the second tubular portion 620 and the fourth tubular portion 640, and the fourth annular portion is located inside the second tubular portion 620.

[0069] Optionally, a first sealing element is provided between the first tubular portion 610 and the first central tube 210. The first sealing element helps to improve the sealing performance between the first tubular portion 610 and the first central tube 210, preventing water from flowing between them. Optionally, the first sealing element is a first sealing ring, and multiple first sealing rings can be provided at intervals as needed to form a multi-layer seal.

[0070] Optionally, a second seal is provided between the second tubular portion 620 and the second central tube 220. The second seal helps to improve the sealing between the second tubular portion 620 and the second central tube 220, preventing water from flowing between them. Optionally, the second seal is a second sealing ring, and multiple second sealing rings can be provided at intervals as needed to form a multi-layer seal.

[0071] Optionally, a third seal is provided between the third annular side plate 430 and the third tubular portion 630. The third seal helps improve the sealing between the third annular side plate 430 and the third tubular portion 630, preventing water from flowing between them. Optionally, the third seal is a third sealing ring, and multiple third sealing rings can be spaced apart as needed to form a multi-layer seal.

[0072] Optionally, a fourth seal is provided between the fourth annular side plate 530 and the fourth tubular portion 640. The fourth seal helps improve the sealing between the fourth annular side plate 530 and the fourth tubular portion 640, preventing water from flowing between them. Optionally, the fourth seal is a fourth sealing ring, and multiple fourth sealing rings can be spaced apart as needed to form a multi-layer seal.

[0073] In some embodiments, the first flow channel includes a first water passage 601 provided through the annular overlap portion 650, a second water passage 602 provided on the protruding connecting portion 660, and a water passage gap provided on the side of the protruding connecting portion 660, below the annular overlap portion 650, and between the inner wall of the filter bottle 100. The first water passage 601, the water passage gap, the second water passage 602, and the water inlet 101 are connected in sequence.

[0074] Optionally, multiple first water passage holes 601 are provided, and the multiple first water passage holes 601 are spaced apart in the circumferential direction of the annular overlapping portion 650. Optionally, the first water passage hole 601 is an oblong hole, a round hole, or a square hole, etc. Optionally, the second water passage hole 602 includes a first horizontal hole and a first vertical hole that are interconnected. The first horizontal hole forms a first opening on the side of the protruding connecting portion 660, and the first vertical hole forms a second opening on the bottom surface of the protruding connecting portion 660. The second opening is directly opposite to the water inlet 101. Of course, in other embodiments, the second water passage hole 602 can also be a curved hole.

[0075] In some embodiments, the second flow channel includes a third water passage 603 disposed on the first annular portion and a fourth water passage 604 disposed on the protruding connecting portion 660, wherein the third water passage 603, the fourth water passage 604 and the first water outlet 102 are connected in sequence.

[0076] Optionally, the third water passage 603 can be a regular hole such as an oblong hole, a round hole, or a square hole, or it can be an irregular hole. The number of third water passages 603 can be one or more, depending on the requirements. Optionally, the fourth water passage 604 includes a second horizontal hole and a second vertical hole that are interconnected. The second horizontal hole is connected to the third water passage 603, and the second vertical hole is directly opposite the water inlet 101. Of course, in other embodiments, the second water passage 602 can also be a curved hole.

[0077] Optionally, the third flow channel includes a fifth water passage 605 disposed on the second annular portion, and the fifth water passage 605 communicates with the second outlet 103. Optionally, the fourth annular portion encloses a seventh water passage 607, and the seventh water passage 607 communicates with the third outlet 104. Optionally, the fifth flow channel includes a sixth water passage 606 disposed on the third annular portion, and the sixth water passage 606 communicates with the fourth outlet 105.

[0078] This utility model also provides a water purifier, which includes a housing and the aforementioned filter element structure 10, with the filter element structure 10 disposed inside the housing. By using the aforementioned filter element structure 10, this water purifier can reduce the overall size of the machine and produce purified water rich in magnesium ions.

[0079] The water purifier also includes a water circuit assembly, which includes an inlet pipe and an outlet pipe. The inlet pipe is connected to the inlet 101, and the outlet pipe is connected to at least a portion of the first outlet 102, the second outlet 103, and the third outlet 104.

[0080] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A filter element structure, characterized in that, include: A filter bottle (100) is provided with a water inlet (101); A central tube assembly (200) is disposed inside the filter bottle (100). The central tube assembly (200) includes a first central tube (210) and a second central tube (220). The first central tube (210) is sleeved outside the second central tube (220). The first central tube (210) is provided with a first water passage (211) penetrating the tube wall, and the second central tube (220) is provided with a second water passage (221) penetrating the tube wall. A filter assembly (300) is disposed inside the filter bottle (100). The filter assembly (300) includes a primary filter unit (310) and a secondary filter unit (320). The primary filter unit (310) is sleeved outside the first central tube (210), and the secondary filter unit (320) is sleeved between the first central tube (210) and the second central tube (220). The water inlet end of the primary filter unit (310) is connected to the water inlet (101). The primary filtration unit (310) is used to purify the raw water and adjust the TDS value of the raw water to form purified water. The purified water can flow to the secondary filtration unit (320) through the first water passage (211). The secondary filtration unit (320) is used to separate at least part of the purified water to form low calcium-magnesium ratio water and high calcium-magnesium ratio water. The high calcium-magnesium ratio water flows to the second central pipe (220) through the second water passage (221). The low calcium-magnesium ratio water is discharged from the outlet end of the secondary filtration unit (320).

2. The filter element structure according to claim 1, characterized in that, The filter bottle (100) is also provided with a first outlet (102), a second outlet (103) and a third outlet (104). The primary filtration unit (310) also forms concentrated water, which flows to the first outlet (102). The outlet end of the secondary filtration unit (320) is connected to the second outlet (103), and the outlet of the second central tube (220) is connected to the third outlet (104). Alternatively, the top of the primary filtration unit (310) forms the water inlet, the bottom of the primary filtration unit (310) forms the water outlet, a water inlet channel communicating with the water inlet (101) is formed between the outer wall surface of the primary filtration unit (310) and the inner wall surface of the filter bottle (100), and the filter bottle (100) is also provided with a first water outlet (102), and the water outlet of the primary filtration unit (310) is connected to the first water outlet (102); Alternatively, the top of the primary filtration unit (310) forms an outlet, the bottom of the primary filtration unit (310) forms an inlet, the filter bottle (100) is also provided with a first outlet (102), a concentrated water outlet channel is formed between the outer wall surface of the primary filtration unit (310) and the inner wall surface of the filter bottle (100), and the concentrated water outlet channel connects the outlet of the primary filtration unit (310) with the first outlet (102); And / or, the filter bottle (100) is also provided with a fourth water outlet (105), and a clean water outlet channel is formed between the inner wall surface of the first central tube (210) and the outer wall surface of the secondary filtration unit (320), and the clean water outlet channel is connected to the fourth water outlet (105), the first water passage channel (211) and the second water passage channel (221).

3. The filter element structure according to claim 1, characterized in that, The primary filtration unit (310) includes an RO membrane or a high-desalination nanofiltration membrane; And / or, the secondary filtration unit (320) includes a salt separation nanofiltration membrane; And / or, the secondary filtration unit (320) has a desalination rate of magnesium sulfate greater than or equal to 85%; And / or, the secondary filtration unit (320) has a desalination rate of less than 50% for sodium chloride; And / or, the secondary filtration unit (320) has a desalination rate of less than 50% for calcium chloride; And / or, the filtration assembly (300) further includes a three-stage filtration unit for reducing the TDS value of the low calcium-magnesium ratio water, wherein the three-stage filtration unit is a desalination nanofiltration membrane or an RO membrane.

4. The filter element structure according to claim 1, characterized in that, One end of the first central tube (210) is closed, and the second central tube (220) is placed inside the first central tube (210), and one end of the second central tube (220) is detachably connected to the closed end of the first central tube (210).

5. The filter element structure according to claim 1, characterized in that, The filter element structure also includes a first support member (400), which is disposed inside the filter bottle (100). The first support member (400) includes a first support ring plate (410) and a first annular side plate (420). The first annular side plate (420) protrudes upward along the circumference of the first support ring plate (410) to form a first mounting cavity (401). The water outlet end of the primary filtration unit (310) is inserted into the first mounting cavity (401). And / or, the filter element structure further includes a second support member (500), which is disposed inside the filter bottle (100). The second support member (500) includes a second support ring plate (510) and a second annular side plate (520). The second annular side plate (520) protrudes upward along the circumference of the second support ring plate (510) to form a second mounting cavity (501). The water outlet end of the secondary filtration unit (320) is inserted into the second mounting cavity (501).

6. The filter element structure according to claim 2, characterized in that, The filter element structure also includes a main support (600), which is fixed inside the filter bottle (100). The main support (600) is used to support the central tube assembly (200) and the filter assembly (300). The main support (600) is provided with a first flow channel, a second flow channel, a third flow channel, a fourth flow channel and a fifth flow channel that are independent of each other. The first flow channel connects the water inlet (101) and the water inlet channel. The second flow channel connects the water outlet of the primary filter unit (310) and the first water outlet (102). The third flow channel connects the water outlet of the secondary filter unit (320) and the second water outlet (103). The fourth flow channel connects the water outlet of the second central tube (220) and the third water outlet (104). The fifth flow channel connects the purified water outlet channel and the fourth water outlet (105).

7. The filter element structure according to claim 6, characterized in that, The main support (600) includes a first tubular portion (610), which is inserted into the outlet end of the first central pipe (210). And / or, the main support (600) includes a second tubular portion (620) which is inserted into the outlet end of the second central pipe (220); And / or, the main support member (600) includes a third tubular portion (630), and the filter element structure further includes a first support member (400), the first support member (400) being used to support the primary filter unit (310), the first support member (400) including a third annular side plate (430), the third annular side plate (430) being inserted into the third tubular portion (630); And / or, the main support member (600) includes a fourth tubular portion (640), and the filter element structure further includes a second support member (500), the second support member (500) for supporting the secondary filter unit (320), the second support member (500) including a fourth annular side plate (530), the fourth annular side plate (530) being inserted into the fourth tubular portion (640); And / or, a support surface is formed inside the filter bottle (100), and the total support member (600) includes an annular overlap portion (650) that overlaps the support surface.

8. The filter element structure according to claim 7, characterized in that, The first flow channel includes a first water passage hole (601) provided through the annular overlapping portion (650); The main support (600) further includes a protruding connecting portion (660) located below the annular overlapping portion (650). The first flow channel further includes a second water passage hole (602) located on the protruding connecting portion (660) and a water passage gap located on the side of the protruding connecting portion (660), below the annular overlapping portion (650), and between the inner wall of the filter bottle (100). The first water passage hole (601), the water passage gap, the second water passage hole (602), and the water inlet (101) are connected in sequence.

9. The filter element structure according to claim 7, characterized in that, The main support member (600) further includes a first annular portion disposed between the first tubular portion (610) and the third tubular portion (630), and the second flow channel includes a third water passage hole (603) disposed on the first annular portion; the main support member (600) further includes a protruding connecting portion (660) disposed below the annular overlapping portion (650), and the second flow channel further includes a fourth water passage hole (604) disposed on the protruding connecting portion (660), and the third water passage hole (603), the fourth water passage hole (604) and the first outlet (102) are connected in sequence; And / or, the total support member (600) further includes a second annular portion disposed between the first tubular portion (610) and the fourth tubular portion (640), and the third flow channel includes a fifth water passage hole (605) disposed on the second annular portion, and the fifth water passage hole (605) communicates with the second water outlet (103); And / or, the total support member (600) further includes a third annular portion disposed between the second tubular portion (620) and the fourth tubular portion (640), and the fifth flow channel includes a sixth water passage hole (606) disposed on the third annular portion, and the sixth water passage hole (606) communicates with the fourth water outlet (105); And / or, the main support (600) further includes a fourth annular portion disposed within the second tubular portion (620), the fourth annular portion forming a seventh water passage (607), the seventh water passage (607) communicating with the third water outlet (104).

10. A water purifier, characterized in that, It includes a housing and a filter element structure as described in any one of claims 1-9, wherein the filter element structure is disposed within the housing.

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