A stage-type filter element assembly and a water purification device

Abstract

The present invention provides a staged filter element assembly and a water purification device. The staged filter element assembly includes: a first filter element, a second filter element, a support member, a filter bottle body, and a filter bottle cap. The support member can support the first filter element and the second filter element. Raw water is filtered by the first filter element, and the pure water filtered out by the first filter element can enter the interior of the support member and be discharged along the support member. The concentrated water filtered out by the first filter element can reach the second filter element for filtration. The pure water filtered out by the second filter element can be discharged along the support member, and the concentrated water filtered out by the second filter element can be discharged through the concentrated water outlet. The filter bottle body and the filter bottle cap jointly enclose an internal cavity, and the first filter element, the second filter element, and the support member are all arranged in the internal cavity. A first water sealing member is arranged at the upper end of the first filter element. Through the present invention, staged filter element filtration can be achieved on the same central pipe, which can improve the recovery rate while reducing the volume, and solve the problem of excessive volume caused by the series connection of multiple filter elements.

Description

Technical Field

[0001] The present invention belongs to the technical field of water purification, and particularly relates to a segmented filter element assembly and a water purification device. Background Art

[0002] As a development trend of water purifiers, the realization of high water production rate mainly includes adding chemical scale inhibitors, and segmental filtration composed of multiple filter elements in series. However, although the above two technologies can achieve high recovery rates, they have the following problems:

[0003] Problem 1: Adding chemical scale inhibitors can achieve good scale inhibition effect and improve the net water production rate, but there are health and safety problems caused by the release of scale inhibitors.

[0004] Problem 2: Compared with single-stage filter elements, the recovery rate of the segmental technology with multiple filter elements in series can be improved to a certain extent, but the technical route needs to be optimized for household machines that pursue small volume.

[0005] Without using chemical scale inhibitors to achieve high water production rate, the segmented filter element technology has good application prospects. However, the form of multiple filter elements in series leads to large volume. If the segmented filtration function can be realized on the same central tube, the characteristics of the segmented filtration technology can be effectively exerted, and at the same time, the volume problem caused by multiple filter elements can be solved. However, a problem at present is that if the segmented filtration function is realized on the same central tube, the central tube will inevitably be used in segments, which will reduce the effective flow channel length of the filter element and thus affect the service life of the filter element.

[0006] Due to the technical problems in the traditional filter element assembly in the prior art, such as being unable to improve the recovery rate and reduce the volume at the same time, the present invention researches and designs a segmented filter element assembly and a water purification device. Summary of the Invention

[0007] Therefore, the technical problem to be solved by the present invention is to overcome the defect that the traditional filter element assembly in the prior art cannot improve the recovery rate and reduce the volume at the same time, so as to provide a segmented filter element assembly and a water purification device.

[0008] The present invention provides a segmented filter element assembly, which includes:

[0009] A first filter element, a second filter element, a support member, a filter bottle body, and a filter bottle cap. The support member can support the first filter element and the second filter element simultaneously. Raw water can pass through the first filter element for filtration. The pure water filtered by the first filter element can enter the interior of the support member and be discharged along the support member. The concentrated water filtered by the first filter element can reach the second filter element for filtration. The pure water filtered by the second filter element can also enter the interior of the support member and be discharged along the support member. The concentrated water filtered by the second filter element can pass through the concentrated water outlet and be discharged;

[0010] The filter bottle body and the filter bottle cap jointly enclose an internal cavity. The first filter element, the second filter element, and the support member are all arranged in the internal cavity. A first water sealing member is arranged at the upper end of the first filter element, and the first water sealing member can seal a part of the structure at the upper end of the first filter element.

[0011] In some embodiments, the filter bottle cap is provided on the upper end of the filter bottle body:

[0012] A raw water inlet is provided on the filter bottle cap. A pure water outlet is formed at the lower end of the support member. A concentrated water outlet is provided between the lower end of the filter bottle body and the support member; or, a raw water inlet is provided at the lower end of the filter bottle body. A pure water outlet is formed at the lower end of the support member. A concentrated water outlet is provided between the lower end of the filter bottle body and the support member.

[0013] In some embodiments, a first gap flow channel for water to flow through is formed between the upper end of the first filter element and the filter bottle cap. A second gap flow channel for water to flow through is formed between the outer periphery of the first filter element and the filter bottle body. A third gap flow channel for water to flow through is formed between the outer periphery of the second filter element and the filter bottle body. A fourth gap flow channel for water to flow through is formed between the lower end of the second filter element and the filter bottle body.

[0014] In some embodiments, an opening is provided on the first water sealing member to form a first inlet, which can allow the water above the first filter element to flow downward through the first inlet into the first filter element; the outer periphery of the first filter element is sealed by a first circumferential water sealing member.

[0015] In some embodiments, a second water sealing member is further disposed between the lower end of the first filter element and the upper end of the second filter element. The second water sealing member can seal a part of the structure at the lower end of the first filter element. An opening is formed in the second water sealing member to form a second inlet, which can allow the concentrated water filtered by the first filter element to flow downward through the second inlet into the second filter element; the outer periphery of the second filter element is sealed by a second circumferential water sealing member; a third water sealing member is further disposed at the lower end of the second filter element. The third water sealing member can seal a part of the structure at the lower end of the second filter element. An opening is formed in the third water sealing member to form a third outlet, which can allow the concentrated water filtered by the second filter element to flow downward through the third outlet to the concentrated water outlet and be discharged;

[0016] Wherein the first inlet is disposed closer to the radial inner side than the second inlet, and the third outlet is disposed closer to the radial inner side than the second inlet; or the first inlet is disposed closer to the radial outer side than the second inlet, and the third outlet is disposed closer to the radial outer side than the second inlet.

[0017] In some embodiments, the support member is in the structure of a central tube. The central tube is a cylindrical tube with a hollow cavity, and diversion holes penetrating through the inner and outer walls are formed in its tube wall. The diversion holes include a first diversion hole opposite to the position of the first filter element and a second diversion hole opposite to the position of the second filter element. The pure water filtered by the first filter element can enter the interior of the central tube through the first diversion hole, and the pure water filtered by the second filter element can enter the interior of the central tube through the second diversion hole.

[0018] In some embodiments, the central tube sequentially includes a first shaft section, a second shaft section, and a third shaft section along its axial direction. The first diversion hole is formed in the first shaft section, the second diversion hole is formed in the third shaft section, and no diversion hole is formed in the second shaft section. The first filter element is wound around the outer periphery of the first shaft section, and the second filter element is wound around the outer periphery of the third shaft section.

[0019] In some embodiments, the central tube is an injection molded part; the central tube is arranged such that its central axis is along the vertical direction. The first filter element is located above the second filter element. The first shaft section, the second shaft section, and the third shaft section are connected in sequence from top to bottom. The upper end of the central tube is a closed end, and raw water enters the first filter element through above the first filter element.

[0020] In some embodiments, the support member includes an end cap assembly, a first post-filter, and a second post-filter. The first post-filter has a first hollow cavity inside, and the second post-filter has a second hollow cavity inside. The first post-filter faces the first filter, and the pure water filtered out by the first filter can enter the first hollow cavity after being further filtered by the first post-filter. The pure water filtered out by the second filter can enter the second hollow cavity after being further filtered by the second post-filter. The first hollow cavity communicates with the second hollow cavity.

[0021] In some embodiments, the first filter is wound around the outer periphery of the first post-filter, and the second filter is wound around the outer periphery of the second post-filter. The first filter and the second filter are arranged at intervals.

[0022] In some embodiments, the end cap assembly includes a first end cap, a second end cap, and a third end cap. The first end cap is connected to and disposed at an axial end of the first post-filter that is opposite to the second post-filter. The second end cap is connected to and disposed between the first post-filter and the second post-filter. The third end cap is connected to and disposed at an axial end of the second post-filter that is opposite to the first post-filter.

[0023] In some embodiments, the first post-filter is located above the second post-filter, and the central axes of the first post-filter and the second post-filter coincide and extend in the vertical direction;

[0024] The first end cap, the second end cap, and the third end cap are arranged at intervals in sequence from top to bottom;

[0025] The upper end of the first end cap is a closed end, and raw water enters the first filter through the upper part of the first filter;

[0026] The lower end of the third end cap is an open end, forming a pure water outlet. A second water sealing member is provided at the lower end of the second filter. The second water sealing member can seal water, and a concentrated water outlet is formed between the second water sealing member and the third end cap.

[0027] In some embodiments, the first end cap, the second end cap, and the third end cap are all injection molded parts; the first post-filter and the second post-filter are both made of microporous filter materials, and the pore diameter of the microporous filter materials is 0.02 - 15 μm.

[0028] In some embodiments, the microporous filter material includes at least one of activated carbon and ceramic.

[0029] In some embodiments, one axial end of the first post-filter element is adhesively bonded to the first end cap, and the other axial end of the first post-filter element is adhesively bonded to the second end cap; one axial end of the second post-filter element is adhesively bonded to the second end cap, and the other axial end of the second post-filter element is adhesively bonded to the third end cap;

[0030] The outer diameter of the first post-filter element is less than or equal to the outer diameter of the first end cap, and the outer diameter of the first post-filter element is also less than or equal to the outer diameter of the second end cap;

[0031] The outer diameter of the second post-filter element is less than or equal to the outer diameter of the second end cap, and the outer diameter of the second post-filter element is also less than or equal to the outer diameter of the third end cap.

[0032] The present invention also provides a water purification device, which includes the stage-type filter element assembly described in any one of the previous items.

[0033] The stage-type filter element assembly and the water purification device provided by the present invention have the following beneficial effects:

[0034] 1. In the present invention, by arranging the first and second filter elements on the same support member, the pure water filtered out by the first filter element is discharged from the pure water outlet, and the concentrated water (impure water) filtered out enters the second filter element for filtration, forming at least a one-stage two-stage filtration. Compared with a series connection of multiple fine filtration filter elements, the stage-type filtration technology can be effectively realized, and the stage-type filter element filtration function on the same central tube can be achieved, which can improve the recycling rate of wastewater. Since each existing filter element requires a membrane housing, a series connection of filter elements requires multiple membrane housings. The present invention can effectively save the volume of the membrane housing, etc., and finally can reduce the volume while increasing the recovery rate, effectively solving the problem of the overall volume control brought by the series connection of multiple filter elements; the stage-type filter element filtration technology is realized on the same central tube, eliminating the use of multiple filter bottles in the series connection of filter elements, and the integrated design of the filter element can be achieved, which has an important promoting effect on reducing the volume of the filter element and the whole machine; compared with the high-recovery rate filter element technology using scale inhibitors (through one-stage two-stage (at least two-stage), scale inhibitors do not need to be used), the stage-type filter element technology does not have the hygienic and safety problems caused by the release of scale-inhibiting substances.

[0035] 2. In the present invention, the stage-type filter element filtration technology is realized on the same central tube, eliminating the use of multiple filter bottles in the series connection of filter elements, and the integrated design of the filter element can be achieved, which has an important promoting effect on reducing the volume of the filter element and the whole machine; the present invention also adopts the setting form in which the support member includes an end cap assembly and two post-filter elements, which can ensure that the fine filtration filter element plays the stage-type filtration function to improve the net water production rate, and at the same time, the integration with the post-taste filter element can be realized to improve the integration degree of the filter element and reduce the number of filter bottles used, which is beneficial to the small-volume design function of the whole machine; the integration of the fine filtration filter element and the post-taste filter element is beneficial to the small-volume design of the whole machine.

[0036] 3. Through structural design, the present invention realizes the stage filtration function on the same central tube without reducing the effective flow path length of the filter element, thereby achieving a high water production rate while effectively ensuring the service life of the filter element. The present invention also forms a long flow path structure by means of the sealing structure and the gap channels provided at the axial and radial ends of the first filter element and the second filter element, enabling water to enter the first filter element only from above for filtration, guiding the filtered concentrated water to the second inlet close to the outer or inner radial end relative to the first inlet and entering the second filter element for filtration. This effectively increases the flow distance of water in the radial direction, prevents water from passing through the first filter element from the first inlet and entering the second filter element axially, and prevents the situation where the first filter element fails to play an effective filtration role, effectively increasing the filtration length and improving the overall effect of filtering and purifying water. By having the third outlet and the second inlet located on the radial sides of the second filter element respectively (for example, when the third outlet is located on the inner radial side, the second inlet is located on the outer radial side, and when the third outlet is located on the outer radial side, the second inlet is located on the inner radial side), it can further increase the radial flow length of water in the second filter element, form a long flow path, increase the flow distance of water in the radial direction, prevent water from passing through the second filter element from the second inlet and being directly discharged axially, prevent the situation where the second filter element fails to play an effective filtration role, and improve the overall effect of filtering and purifying water. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 is a schematic structural diagram of Embodiment 1 of the stage filter element assembly of the present invention;

[0038] Figure 2 is a schematic structural diagram of Embodiment 2 of the stage filter element assembly of the present invention;

[0039] Figure 3 is a structural diagram of the stage filter element when the caulking glue line is unfolded;

[0040] Figure 4 is a structural diagram of the mold repair of the stage filter element of the present invention;

[0041] Figure 5 is an end face sealing glue and water path structural diagram of the stage filter element of the present invention;

[0042] Figure 6 is a schematic structural diagram of the cooperation between the central tube (pure injection molded part) and the filter element of the present invention;

[0043] Figure 7 is a schematic structural diagram of the cooperation between the central tube (injection molded part + filter material combination) and the filter element of the present invention;

[0044] Figure 8 is a schematic structural diagram of the central tube (pure injection molded part) of the first-stage two-section filter element of the present invention.

[0045] The reference numerals in the figure are shown as follows:

[0046] 1. First filter element; 2. Second filter element; 3. Raw water inlet; 3a. Central pipe raw water inlet hole; 4. Concentrate water outlet; 5. Central pipe; 51. First shaft section; 52. Second shaft section; 53. Third shaft section; 61. First diversion hole; 62. Second diversion hole; 71. First water sealing member; 71a. First inlet; 72. Second water sealing member; 72a. Second inlet; 73. Third water sealing member; 73a. Third outlet; 74. First circumferential water sealing member; 75. Second circumferential water sealing member; 76. End face rubber seal; 8. Pure water outlet; 9. End cover assembly; 91. First end cover; 92. Second end cover; 93. Third end cover; 10. First post-filter element; 11. Second post-filter element; 12. Filter bottle body; 13. Filter bottle cap; 14. Water inlet partition net; 101. First gap flow channel; 102. Second gap flow channel; 103. Third gap flow channel; 104. Fourth gap flow channel. Detailed implementation manners

[0047] As Figure 1-8 shown, the present invention provides a stage-type filter element assembly, which includes:

[0048] A first filter element 1, a second filter element 2, a support member, a filter bottle body 12 and a filter bottle cap 13. The support member can support the first filter element 1 and the second filter element 2 at the same time. Raw water can pass through the first filter element 1 for filtration. The pure water filtered by the first filter element 1 can enter the interior of the support member and be discharged along the support member. The concentrated water filtered by the first filter element 1 can reach the second filter element 2 for filtration. The pure water filtered by the second filter element 2 can also enter the interior of the support member and be discharged along the support member. The concentrated water filtered by the second filter element 2 can be discharged through the concentrated water outlet 4;

[0049] The filter bottle body 12 and the filter bottle cap 13 jointly enclose an internal cavity. The first filter element 1, the second filter element 2 and the support member are all arranged in the internal cavity. A first water sealing member 71 is arranged at the upper end of the first filter element 1, and the first water sealing member 71 can seal a part of the structure at the upper end of the first filter element 1.

[0050] In order to utilize the characteristics of high water production rate of the stage-type filter element and realize the stage-type filtration technology on the same central pipe to reduce the volume of the filter element, while not shortening the effective flow channel length of the filter element and affecting the service life of the filter element, the present invention provides an integrated spiral wound membrane filter element with long flow channel characteristics and stage-type filtration function and its structure, which makes the best use of the advantages and avoids the disadvantages of the above technologies, and has certain technical advantages.

[0051] In the present invention, a first filter element and a second filter element are arranged on the same support member. The pure water filtered out by the first filter element is discharged from the pure water outlet, and the concentrated water (impure water) filtered out enters the second filter element for filtration, forming at least a one-stage two-segment filtration. Compared with a series connection of multiple fine filter elements, it can effectively implement the stage filtration technology, and can realize the stage filter element filtration function on the same central tube, which can improve the recycling rate of wastewater. Since each existing filter element requires a membrane housing, a series of filter elements requires multiple membrane housings. The present invention can effectively save the volume of the membrane housing, etc., and finally can reduce the volume while increasing the recovery rate, effectively solving the problem of the overall volume control caused by the series connection of multiple filter elements; the stage filter element filtration technology is realized on the same central tube, eliminating the use of multiple filter bottles in series for the filter elements, and the integrated design of the filter elements can be realized, which plays an important role in reducing the volume of the filter elements and the whole machine; compared with the high-recovery filter element technology that uses scale inhibitors (through one-stage two-segment (at least two-segment), scale inhibitors do not need to be used), the stage filter element technology does not have the hygienic and safety problems caused by the release of scale substances.

[0052] The present invention provides an integrated spiral wound membrane filter element with long flow channel characteristics and stage filtration function. Compared with the realization of the stage function by the series connection of traditional multiple filter elements, it can share the same central tube, which plays a role in promoting the reduction of the volume of the filter element, and has the characteristics of high water production rate of the stage filter element filtration technology; at the same time, although the stage filtration function is realized on the same central tube by using the central tube in sections, through the optimized structural design, the long flow channel characteristics of each section of the filter element are realized, effectively ensuring the service life of the filter element while achieving high water production rate.

[0053] In some embodiments, the filter bottle cap 13 is disposed on the upper end of the filter bottle body 12:

[0054] The filter bottle cap 13 is provided with a raw water inlet 3, the lower end of the support member forms a pure water outlet 8, and a concentrated water outlet 4 is provided between the lower end of the filter bottle body 12 and the support member; alternatively, the lower end of the filter bottle body 12 is provided with a raw water inlet 3, the lower end of the support member forms a pure water outlet 8, and a concentrated water outlet 4 is provided between the lower end of the filter bottle body 12 and the support member. These are two different structural forms of the present invention, namely Embodiment 1. For example, Figure 1 the raw water enters from the lower end of the lower filter bottle body, reaches the upper end and then enters the first filter element, and then flows downward in turn, and the concentrated water outlet and the pure water outlet are both located at the lower end. Finally, the filtered pure water (without impurities) and concentrated water (with impurities) are discharged through the pure water outlet and the concentrated water outlet respectively; Embodiment 2, for example, Figure 2 the raw water enters from the upper filter bottle cap, flows downward in turn, and the concentrated water outlet and the pure water outlet are both located at the lower end. Finally, the filtered pure water (without impurities) and concentrated water (with impurities) are discharged through the pure water outlet and the concentrated water outlet respectively.

[0055] The present invention provides an integrated spiral wound membrane filter element with long flow channel characteristics and staged filtration function, which has technical advantages in terms of safety, volume, etc. compared with the existing ways to achieve high water production rate.

[0056] The staged filter element of the present invention focuses on the field of spiral wound membrane filter elements. Spiral wound membranes include nanofiltration, reverse osmosis, etc. Nanofiltration and reverse osmosis filter elements generally have three water ports, namely a raw water inlet, a concentrated water outlet, and a pure water outlet. There are two forms according to the arrangement of the positions of their water ports: 1. The three water ports are distributed at the same end; 2. The concentrated water outlet and the pure water outlet are arranged at one end, and the raw water inlet is arranged at a separate end. The following is a specific scheme description based on the same central tube to achieve the functions of long flow channel and first-stage two-stage filtration, according to the positions of the water ports.

[0057] In some embodiments, a first gap flow channel 101 allowing water to flow through is formed between the upper end of the first filter element 1 and the filter bottle cap 13, a second gap flow channel 102 allowing water to flow through is formed between the outer periphery of the first filter element 1 and the filter bottle body 12, a third gap flow channel 103 allowing water to flow through is formed between the outer periphery of the second filter element 2 and the filter bottle body 12, and a fourth gap flow channel 104 allowing water to flow through is formed between the lower end of the second filter element 2 and the filter bottle body 12. Through the first gap flow channel between the upper end of the first filter element and the filter bottle cap, the second gap flow channel on the outer periphery of the first filter element, the third gap flow channel on the outer periphery of the second filter element, and the fourth gap flow channel at the lower end of the second filter element, the present invention enables the raw water as shown in the embodiment to sequentially pass through the fourth gap flow channel, the third gap flow channel, the second gap flow channel, and the first gap flow channel and enter the upper end of the first filter element and then enter the first filter element. This is the preferred structural form of Embodiment 1 of the present invention.

[0058] In some embodiments, an opening is provided on the first water sealing member 71 to form a first inlet 71a, which allows the water above the first filter element 1 to flow downward through the first inlet 71a into the first filter element 1; the outer periphery of the first filter element 1 is sealed by a first circumferential water sealing member 74. Through the first water sealing member provided at the upper end of the first filter element, the present invention can block part of the structure of the first filter element, leaving only the opening of the first inlet so that water can only enter the first filter element through the first inlet for filtration, thereby increasing the flow length and flow path of water in the first filter element, increasing the filtration area, and enhancing the filtration effect. The first circumferential water sealing member and the first water sealing member cooperate to enable the fluid to only enter the first filter element through the first inlet at the upper end of the first filter element, providing conditions for the structure of the long flow channel.

[0059] In some embodiments, a second water sealing member 72 is further disposed between the lower end of the first filter element 1 and the upper end of the second filter element 2. The second water sealing member 72 can seal a part of the structure at the lower end of the first filter element 1. An opening is provided on the second water sealing member 72 to form a second inlet 72a, which can allow the concentrated water filtered out by the first filter element 1 to flow downward through the second inlet 72a into the second filter element 2. The outer periphery of the second filter element 2 is sealed by a second circumferential water sealing member 75. A third water sealing member 73 is further disposed at the lower end of the second filter element 2. The third water sealing member 73 can seal a part of the structure at the lower end of the second filter element 2. An opening is provided on the third water sealing member 73 to form a third outlet 73a, which can allow the concentrated water filtered out by the second filter element 2 to flow downward through the third outlet 73a to the concentrated water outlet 4 and be discharged.

[0060] Wherein the first inlet 71a is disposed closer to the radially inner side relative to the second inlet 72a, and the third outlet 73a is disposed closer to the radially inner side relative to the second inlet 72a; or the first inlet 71a is disposed closer to the radially outer side relative to the second inlet 72a, and the third outlet 73a is disposed closer to the radially outer side relative to the second inlet 72a.

[0061] This is a preferred structural form of the long flow channel of the present invention. The second water sealing member, the second inlet formed thereon, the second circumferential water sealing member, the third water sealing member and the third outlet can effectively ensure that water can only enter the first filter element through the first inlet for filtration, and the concentrated water filtered out by the first filter element can only enter the second filter element through the second inlet for filtration, and the concentrated water filtered out by the second filter element can only be effectively led out through the third outlet and discharged from the concentrated water outlet. The first inlet and the second inlet being located at different ends in the radial direction can increase the flow path of water in the first filter element in the radial direction, prevent water from being discharged along the axis without effective filtration, and thus improve the filtration effect of the first filter element; the second inlet and the third outlet being located at different ends in the radial direction can increase the flow path of water in the second filter element in the radial direction, prevent water from being discharged along the axis without effective filtration, and thus improve the filtration effect of the second filter element.

[0062] 1. Filter element scheme with water ports distributed at the same end. Figure 1Schematic diagram of a long flow channel and a first-stage two-section integrated spiral wound membrane filter element structure with the water outlets distributed at the same end. Raw water enters from the raw water extraction water outlet of the filter bottle, and successively passes through the water sealing member (the third water sealing member 73), the second filter element 2, the water sealing member (the second water sealing member 72), and the outside of the first filter element 1, and then reaches the inlet of the water sealing member (the first water sealing member 71). It enters the end face of the first filter element 1 from this inlet for filtration and purification. The pure water is collected through the pure water diversion port (the first diversion hole 61) on the central tube, and the concentrated water is filtered along the axis of the first filter element 1 and enters the end face of the second filter element 2 from the inlet of the water sealing member (the second water sealing member 72). The concentrated water of the first filter element 1 is used as the raw water of the second filter element 2 for re-filtration to improve the water production rate. The pure water of the second filter element 2 is collected through the pure water diversion port (the second diversion hole 62) on the central tube and then converges with the pure water of the first filter element 1, and is discharged through the pure water port on the central tube. The concentrated water is discharged from the outlet of the water sealing member (the third water sealing member 73) and reaches the concentrated water discharge outlet of the filter bottle body for discharge.

[0063] Among them, the function of the water sealing member (the first water sealing member 71) is to separate the raw water and the concentrated water of the first filter element 1, and at the same time, in combination with glue, seal the end face of the first filter element 1, leaving an inlet to realize the long flow channel feature of the first filter element 1; the function of the water sealing member (the second water sealing member 72) is to separate the raw water and the concentrated water of the first filter element 1, and at the same time, in combination with glue, seal the end faces in contact with the first filter element 1 and the filter element, leaving an inlet, and jointly acting with the water sealing member (the first water sealing member 71) and the water sealing member (the third water sealing member 73), to realize the long flow channel feature of the two-section filter element; the function of the water sealing member (the third water sealing member 73) is to separate the raw water of the first filter element 1 and the concentrated water of the second filter element 2, and at the same time, in combination with glue, seal the end face of the second filter element 2 in contact with the water sealing member (the third water sealing member 73), leaving an outlet to realize the long flow channel feature inside the second filter element 2.

[0064] Among them, the positions of the first inlet 71a of the water sealing member (the first water sealing member 71) and the second inlet 72a of the water sealing member (the second water sealing member 72) are in a diagonal distribution relationship, aiming to avoid the water flow orientation from taking the short flow channel and affecting the filter element life; the positions of the second inlet 72a of the water sealing member (the second water sealing member 72) and the third outlet 73a of the water sealing member (the third water sealing member 73) are also in a diagonal distribution relationship, and the purpose is also to avoid the water flow orientation from taking the short flow channel and affecting the filter element life.

[0065] Among them, the main body of the water sealing member (the first water sealing member 71) is approximately cylindrical, and is fixed and sealed to the outer periphery of the first filter element 1 through tape adhesion; the main body of the water sealing member (the second water sealing member 72) is an expandable inverted T shape, and its tip part is sealed with glue to the groove corresponding to the outer surface of the central tube. At the same time, the cross sections of both ends of the tip part in contact with the first filter element 1 and the second filter element 2 are sealed with glue. After the tip of the water sealing member (the second water sealing member 72) is embedded into the gap between the first filter element 1 and the second filter element 2 and fixed with glue, it forms a circle wrapping the first filter element 1 and the second filter element 2, and its outer surface is sealed with the first filter element 1 and the second filter element 2 respectively through tape adhesion; the main body of the water sealing member (the third water sealing member 73) is approximately cylindrical, the second filter element 2 is sleeved into its inner cavity, and the outer surface and the second filter element 2 are sealed and fixed through tape adhesion. At the same time, the bottom of the water sealing member far from the second filter element 2 has a position for setting a sealing ring, which is used to achieve installation sealing with the corresponding position inside the filter bottle to achieve the purpose of waterway separation.

[0066] Among them, the central tube has pure water diversion holes for collecting the pure water generated by the filter elements; the positions of the diversion holes are non-uniformly distributed and have a corresponding relationship with the length ratio of the first filter element 1 and the second filter element 2. The principle is that the diversion port after film repair should be located in the middle of the corresponding filter element; the outer surface of the central tube at the junction of the first filter element 1 and the second filter element 2 also has a groove feature, which is used to play the role of fixing the water sealing member (the second water sealing member 72) by glue curing; the hollow part of the cross section of the central tube near the first filter element 1 is sealed to prevent water other than pure water from entering the central tube; the concentrated water outlet end near the second filter element 2 is a through port for discharging pure water; the central tube near the pure water outlet end also has a position for setting a sealing ring, which is used to achieve installation sealing with the corresponding position inside the filter bottle to achieve the purpose of waterway separation.

[0067] Among them, the filter bottle body has a raw water inlet, a concentrated water outlet, and a pure water outlet; the filter bottle body and the filter bottle cap can be sealed through spin fusion or screw connection, etc.; near the sealed end of the central tube on the filter bottle cap, there is a corresponding filter element fixing position for positioning and fixing the filter element during installation.

[0068] 2. The filter element scheme with different water inlet and outlet positions. The difference between this scheme and the scheme with the same water inlet and outlet positions is that the raw water inlet is located at one end alone, and the concentrated water outlet and the pure water outlet are located at one end; at the same time, a central tube raw water inlet hole 3a is opened on the end wall of the central tube near the cross section of the filter element inlet. In addition, the functions of each water sealing member vary with the water flow difference, which will not be described one by one here. Compared with the scheme with the same water inlet and outlet positions, the long flow channel stage type filter element filtering function can be achieved.

[0069] Whether it is the scheme with the same water inlet and outlet positions or the scheme with different water inlet and outlet positions, the basic manufacturing process of the filter element body and the glue sealing process with the water sealing member are the same, as follows:

[0070] Sealing glue line setting for the bottom filter element. In this technical solution, a stage-type filter element technology is achieved by applying glue and trimming the membrane on the same central tube. Figure 3 This is the specific method of applying glue. After arranging the membrane sheet and the water inlet spacer to form the first membrane leaf, apply glue according to Figure 3 This technical solution is a stage-type filter element technology and an integrated design for the filter element. Therefore, the first and second stage filter elements are simply referred to as filter element one and filter element two respectively. As can be seen from Figure 3 , for the glue lines of the first filter element 1 and the second filter element 2, except for not applying glue on the parallel edges of the membrane sheet close to the central tube, glue is applied on the other three sides; the first filter element 1 and the second filter element 2 are two separate and complete glue lines. The glue lines perpendicular to the central tube do not coincide with the outer edge of the membrane sheet, and a certain distance needs to be left for trimming the membrane after the filter element is rolled and the glue is cured to ensure the sealing of the filter element; the width of the glue line of each filter element needs to be greater than the width of the corresponding filter element water guide port to prevent the glue from directly facing the water guide port and blocking the water production; a distance d1 needs to be left between the adjacent glue lines of the first filter element 1 and the second filter element 2. The reserved distance d1 is used for trimming the membrane after the filter element is cured to form a stage-type filter element (see the description of membrane trimming); the glue line position of the second filter element 2 is close to the pure water outlet end; for each placed membrane leaf, glue needs to be applied according to the glue application method shown in Figure 3 . After the last membrane leaf is placed, apply glue and then wind it up to roll the filter element into a cylindrical shape. After the glue is cured, perform the membrane trimming operation.

[0071] Membrane trimming. In this technical solution, a stage-type filter element technology is achieved by means of glue line setting and membrane trimming on the same central tube. The specific membrane trimming method is as shown in Figure 4 . After the filter element is cured, use the corresponding membrane trimming blade to trim the membrane. To achieve membrane trimming, this technical solution is described with a 4-blade membrane trimming method. Take a central tube of an unrolled filter element, adjust the blade positions according to the corresponding points of blade 1 and point 1, blade 2 and point 2, etc., and then start the membrane trimming equipment (not specifically described) to remove the membrane that needs to be removed. After removing the trimmed part, there is a gap between the first filter element 1 and the second filter element 2 in the form of a trimmed sample. Its function is the concentrated water outlet end of the first filter element 1 and also serves as the raw water inlet end of the second filter element 2, realizing a one-stage two-stage filtration.

[0072] After the membrane trimming is completed, the filter element needs to be sealed with the above-mentioned water sealing parts and the filter element using glue and tape. Figure 5 This is a schematic diagram for explaining this part of the operation. As can be seen from Figure 5 , after operating on the base membrane, compared with before modification, the membrane flow channels of the first filter element 1 and the second filter element 2 change from longitudinal to transverse, and the flow channel length ≥ the longitudinal length. Therefore, it plays an important role in ensuring the service life of the filter element.

[0073] In some embodiments, the support member has the structure of a central tube 5. The central tube 5 is a cylindrical tube with a hollow cavity, and diversion holes penetrating through the inner and outer walls are provided on its tube wall. The diversion holes include a first diversion hole 61 opposite to the position of the first filter element 1 and a second diversion hole 62 opposite to the position of the second filter element 2. The pure water filtered out by the first filter element 1 can enter the interior of the central tube 5 through the first diversion hole 61, and the pure water filtered out by the second filter element 2 can enter the interior of the central tube 5 through the second diversion hole 62.

[0074] This is the first preferred structural form of the support member of the present invention. As Figure 6 , the support member of the present invention is preferably arranged in the structure of a central tube (the whole is an injection molded part). It can not only effectively support the first and second filter elements, but also effectively introduce the pure water filtered out by the first filter element into the internal cavity of the central tube through the first diversion hole opened thereon and discharge the pure water. The second diversion hole effectively introduces the pure water filtered out by the second filter element into the internal cavity of the central tube and discharges it. The impurity water (concentrated water) filtered out by the first filter element enters the second filter element for filtration, which can effectively improve the filtration effect of the concentrated water, increase the wastewater recovery rate, thereby increasing the water production, and at the same time reducing the volume and making the structure more compact.

[0075] The raw water enters from the end face of the first filter element 1 close to the tail end of the central tube. The pure water is collected into the central tube through the diversion hole, and the concentrated water enters the second filter element as the raw water of the second filter element from the concentrated water end close to the first filter element 1. The pure water is collected through the diversion hole and converges with the pure water of the first filter element 1 and is discharged from the pure water outlet, while the concentrated water is discharged from the end face. Among them, the function of the first circumferential water sealing member 74 is to separate the raw water (the periphery is all raw water) from the concentrated water of the first filter element 1, and the function of the second circumferential water sealing member 75 is to separate the concentrated water of the second filter element 2 from the raw water (the periphery is all raw water).

[0076] In some embodiments, the central tube 5 sequentially includes a first shaft section 51, a second shaft section 52, and a third shaft section 53 along its axial direction. The first diversion hole 61 is opened on the first shaft section 51, the second diversion hole 62 is opened on the third shaft section 53, and no diversion hole is opened on the second shaft section 52. The first filter element 1 is wound around the outer periphery of the first shaft section 51, and the second filter element 2 is wound around the outer periphery of the third shaft section 53. The central tube of the invention is preferably arranged as the first, second, and third shaft sections along the axial direction. The first diversion hole is opened on the first shaft section, and the first filter element is wound around the outer periphery of the first shaft section, which can introduce the pure water filtered out by the first filter element into the internal cavity of the central tube through the first diversion hole. The second diversion hole is opened on the third shaft section, and the second filter element is wound around the outer periphery of the third shaft section, which can introduce the pure water filtered out by the second filter element into the internal cavity of the central tube through the second diversion hole. As Figure 8, to achieve two - stage in one central tube, a distance D2 needs to be reserved between D1 and D3 ((D1 refers to the axial length of the first filter element, D3 refers to the axial length of the second filter element, and D2 is the axial length of the interval between the two filter elements)). The purpose is to form two parts of the filter element during membrane repair. Among them, the starting surface at the upper end of D2 is the end surface of the first - stage filter element close to the second - stage filter element, and the ending surface is the end surface of the second - stage filter element close to the first - stage filter element. The two - stage central tube of the present invention can integrate the two - stage technology of traditional multi - filter - element series connection on the same central tube, achieving a high water production rate while reducing the number of filter bottles used. However, its filtering function is only the purification function of the fine - filtering filter element, which is single - stage purification.

[0077] In some embodiments, the central tube 5 is an injection - molded part; the central tube 5 is arranged such that its central axis is along the vertical direction, the first filter element 1 is located above the second filter element 2, the first shaft section 51, the second shaft section 52, and the third shaft section 53 are connected in sequence from top to bottom, the upper end of the central tube 5 is a closed end, and raw water enters the first filter element 1 through above the first filter element 1.

[0078] The central tube of the present invention is preferably an integral injection - molded part (more preferably integrally injection - molded from plastic), which can effectively support the inner circumference of the filter element and also play a role in guiding pure water; the central tube arranged along the vertical direction of the central axis forms the first, second, and third shaft sections from top to bottom, and the first filter element and the second filter element are also arranged from top to bottom. The upper end of the central tube is closed to prevent raw water from entering the interior of the central tube. The raw - water inlet is above the first filter element, and the raw water enters the first filter element for filtration. The filtered pure water then enters the interior of the central tube through the first diversion hole.

[0079] As Figure 7, in some embodiments, the support member includes an end cap assembly 9, a first post-filter element 10, and a second post-filter element 11. The first post-filter element 10 has a first hollow cavity inside, and the second post-filter element 11 has a second hollow cavity inside. The first post-filter element 10 is opposite to the first filter element 1. The pure water filtered out by the first filter element 1 can enter the first hollow cavity after being further filtered by the first post-filter element 10. The pure water filtered out by the second filter element 2 can enter the second hollow cavity after being further filtered by the second post-filter element 11. The first hollow cavity communicates with the second hollow cavity. This is another preferred structural form of the support member of the present invention, that is, the support member includes an end cap assembly and two post-filter elements. While ensuring that the fine filtration filter element plays a staged filtration function to improve the net water production rate, it can also be integrated with the post-taste filter element to improve the filter element integration degree and reduce the number of filter bottles used, which is beneficial to the small-volume design function of the whole machine; the integration of the fine filtration filter element and the post-taste filter element is beneficial to the small-volume design of the whole machine.

[0080] The staged filter element assembly of the present invention has a primary two-stage purification function, which improves the water production rate. At the same time, it can be closely attached to the post-filter element to achieve a two-stage purification function on one filter element assembly. Its structure is basically the same as that of the central tube filter element made of pure injection molding. The difference is that the central tube is composed of an injection molding part and a multi-microporous filter material, which can achieve primary two-stage purification to improve the water production rate. At the same time, it can realize in-situ purification of the water produced by the fine filtration filter element and achieve a two-in-one filter element structure.

[0081] , in some embodiments, the first filter element 1 is wound around the outer periphery of the first post-filter element 10, the second filter element 2 is wound around the outer periphery of the second post-filter element 11, the first filter element 1 and the second filter element 2 are arranged at intervals, and the first water sealing member 71 is arranged at the interval part. The first water sealing member 71 is opposite to the second end cap 92. Winding the first filter element around the outer periphery of the first post-filter element can radially inwardly transport the pure water filtered out by the first filter element into the first post-filter element for further filtration and purification. Winding the second filter element around the outer periphery of the second post-filter element can radially inwardly transport the pure water filtered out by the second filter element into the second post-filter element for further filtration and purification; the first water sealing member can separate and seal the concentrated water inside it from the raw water outside it to prevent the two from mixing.

[0082] In some embodiments, the end cap assembly 9 includes a first end cap 91, a second end cap 92, and a third end cap 93. The first end cap 91 is connected and disposed at an axial end of the first post-filter element 10 that is opposite to the second post-filter element 11. The second end cap 92 is connected and disposed between the first post-filter element 10 and the second post-filter element 11. The third end cap 93 is connected and disposed at an axial end of the second post-filter element 11 that is opposite to the first post-filter element 10. This is a preferred structural form of the end cap assembly of the present invention, that is, the first end cap is used to support and fix one end of the first post-filter element, the second end cap is used to support and fix the other end of the first post-filter element, the second end cap can also support and fix one end of the second post-filter element, and the third end cap supports and fixes the other end of the second post-filter element.

[0083] Figure 7 The shown support member is jointly composed of an injection molded part and a filter medium, which can achieve the purpose of high water production rate with two stages in one stage for the fine filtration filter element, and can be in-situ compounded with the post-filter element of the fine filtration filter element to form a stage-type filter element with two-stage filtration function. The specific components include a first end cap 91, a second end cap 92, a third end cap 93, a first post-filter element 10, and a second post-filter element 11.

[0084] The outer diameters and effective inner diameters of the three end caps are the same, for the purpose of facilitating the production of the initial filter element; one end of the first end cap 91 is sealed, for the purpose of realizing water path separation; both ends of the second end cap 92 are connected, for the purpose of realizing water path conduction; both ends of the third end cap 93 are also connected, for the purpose of discharging the collected pure water, and at the same time, there is a sealing groove feature on the outer surface near the water outlet end, and its function is to realize water path separation.

[0085] In some embodiments, the first post-filter element 10 is located above the second post-filter element 11, and the central axes of the first post-filter element 10 and the second post-filter element 11 coincide and extend in the vertical direction;

[0086] The first end cap 91, the second end cap 92, and the third end cap 93 are arranged at intervals from top to bottom in sequence;

[0087] The upper end of the first end cap 91 is a closed end, and raw water enters the first filter element 1 from above the first filter element 1;

[0088] The lower end of the third end cap 93 is an open end, which forms a pure water outlet 8. A second water sealing member 72 is provided at the lower end of the second filter element 2. The second water sealing member 72 can seal water, and a concentrated water outlet 4 is formed between the second water sealing member 72 and the third end cap 93.

[0089] This is a further preferred structural form of the support member of the injection molded part + filter media combination of the present invention, that is, the first and second post-filters arranged in the vertical direction, which can enable raw water to flow into the first filter from top to bottom for filtration, and then transport the concentrated water in the first filter to the second filter for filtration, forming a first-stage two-stage filtration structure. The pure water opening formed below the third end cap can effectively export the pure water filtered by the post-filter, and the concentrated water outlet is used to export the impurity water filtered by the second filter.

[0090] In some embodiments, the first end cap 91, the second end cap 92, and the third end cap 93 are all injection molded parts; the first post-filter 10 and the second post-filter 11 are both made of microporous filter media, and the pore diameter of the microporous filter media is 0.02 - 15 μm. The three end caps of the present invention are all made of injection molded parts, which can effectively play a role in supporting and fixing. The first and second post-filters made of microporous filter media can further finely filter the pure water filtered by the first and second filters, which can improve the taste of water, etc. and improve the filtration accuracy.

[0091] In some embodiments, the microporous filter media includes at least one of activated carbon and ceramic. Compared with the visible holes of the injection molded part, it can realize the surface contact between the water produced by the fine filtration filter element and the post-filter, and the purification effect is better. The length ratio of the first post-filter 10 and the second post-filter 11 is preferably between 1 and 2.5.

[0092] In some embodiments, one axial end of the first post-filter 10 is bonded to the first end cap 91, and the other axial end of the first post-filter 10 is bonded to the second end cap 92; one axial end of the second post-filter 11 is bonded to the second end cap 92, and the other axial end of the second post-filter 11 is bonded to the third end cap 93;

[0093] The outer diameter of the first post-filter 10 is less than or equal to the outer diameter of the first end cap 91, and the outer diameter of the first post-filter 10 is also less than or equal to the outer diameter of the second end cap 92;

[0094] The outer diameter of the second post-filter 11 is less than or equal to the outer diameter of the second end cap 92, and the outer diameter of the second post-filter 11 is also less than or equal to the outer diameter of the third end cap 93.

[0095] The first post-filter of the present invention is preferably fixed to the two end caps by bonding. The first post-filter 10 is cylindrical, its outer diameter ≤ the outer diameters of the first end cap 91 and the second end cap 92, and its inner diameter is equal to the outer wall of the effective inner diameter of the two end caps to achieve fitting. The connection between the first post-filter 10 and the two end caps is bonded and fixed on the mating end faces with glue;

[0096] The second rear filter element 11 is cylindrical, its outer diameter ≤ the outer diameters of the second end cap 92 and the third end cap 93, and its inner diameter is equal to the outer wall of the effective inner diameter of the two end caps to achieve fitting. The connection between the second rear filter element 11 and the two end caps is fixed by glue bonding on the mating end faces.

[0097] The present invention also provides a water purification device, which includes the stage-type filter element assembly described in any one of the preceding items.

[0098] The present invention realizes the stage-type filter element filtration technology on the same central tube, eliminates the use of multiple filter bottles in series for the filter elements, and can realize the integrated design of the filter elements, which plays an important role in reducing the volume of the filter elements and the whole machine; the present invention also adopts the setting form of including an end cap assembly and two rear filter elements for the support member, which can not only ensure that the fine filtration filter element plays the stage-type filtration function to improve the net water production rate, but also realize the integration with the rear taste filter element to improve the filter element integration degree and reduce the number of filter bottles used, which is beneficial to the small volume design function of the whole machine; the integration of the fine filtration filter element and the rear taste filter element is beneficial to the small volume design of the whole machine.

[0099] Through the structural design, the present invention realizes the stage-type filtration function on the same central tube without reducing the effective flow channel length of the filter element, so that the high water production rate can be achieved while effectively ensuring the service life of the filter element; the present invention also adopts the sealing structure and the gap channel arranged at the axial end and the radial end of the first filter element and the second filter element, so that water can only enter the first filter element from above the first filter element for filtration, and the concentrated water filtered out is guided to the second inlet close to the outer radial end or the inner radial end relative to the first inlet and enters the second filter element for filtration, forming a long flow channel structure, thereby effectively increasing the flow distance of water in the radial direction, preventing water from passing through the first filter element from the first inlet and entering the second filter element axially, preventing the situation where the first filter element cannot play an effective filtering role, effectively increasing the filtering length, and improving the overall filtering and water purification effect; by arranging the third outlet and the second inlet on the radial two sides of the second filter element respectively (for example, when the third outlet is located on the inner radial side and the second inlet is located on the outer radial side, and when the third outlet is located on the outer radial side, the second inlet is located on the inner radial side), it can further increase the radial flow length of water in the second filter element, form a long flow channel, increase the flow distance of water in the radial direction, prevent water from passing through the second filter element from the second inlet and being directly discharged axially, prevent the situation where the second filter element cannot play an effective filtering role, and improve the overall filtering and water purification effect.

[0100] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention. The above is only the preferred implementation manner of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and variations can still be made, and these improvements and variations should also be regarded as within the protection scope of the present invention.

Claims

1. A segmented filter element assembly, characterized in that: Comprising: A first filter element (1), a second filter element (2), a support member, a filter bottle body (12) and a filter bottle cap (13), wherein the support member can support the first filter element (1) and the second filter element (2) simultaneously. Raw water can pass through the first filter element (1) for filtration. The pure water filtered by the first filter element (1) can enter the interior of the support member and be discharged along the support member. The concentrated water filtered by the first filter element (1) can reach the second filter element (2) for filtration. The pure water filtered by the second filter element (2) can also enter the interior of the support member and be discharged along the support member. The concentrated water filtered by the second filter element (2) can pass through the concentrated water outlet (4) and be discharged; The filter bottle body (12) and the filter bottle cap (13) jointly enclose an internal cavity. The first filter element (1), the second filter element (2) and the support member are all arranged in the internal cavity. A first water sealing member (71) is arranged at the upper end of the first filter element (1). The first water sealing member (71) can seal a part of the structure at the upper end of the first filter element (1). Through the first water sealing member (71), the separation and sealing between the concentrated water inside the first filter element (1) and the raw water outside can be carried out; A first gap flow channel (101) allowing water to flow through is formed between the upper end of the first filter element (1) and the filter bottle cap (13). A second gap flow channel (102) allowing water to flow through is formed between the outer periphery of the first filter element (1) and the filter bottle body (12). A third gap flow channel (103) allowing water to flow through is formed between the outer periphery of the second filter element (2) and the filter bottle body (12). A fourth gap flow channel (104) allowing water to flow through is formed between the lower end of the second filter element (2) and the filter bottle body (12); An opening is provided on the first water sealing member (71) to form a first inlet (71a), which can allow the water above the first filter element (1) to flow downward through the first inlet (71a) into the first filter element (1). The outer periphery of the first filter element (1) is sealed by a first circumferential water sealing member (74); The The outer periphery of the second filter element (2) is sealed by a second circumferential water sealing member (75); A second water seal member (72) is further provided between the lower end of the first filter element (1) and the upper end of the second filter element (2). The second water seal member (72) can seal a part of the structure at the lower end of the first filter element (1). An opening is provided on the second water seal member (72) to form a second inlet (72a), which can allow the concentrated water filtered out by the first filter element (1) to flow downward through the second inlet (72a) into the second filter element (2). A third water seal member (73) is further provided at the lower end of the second filter element (2). The third water seal member (73) can seal a part of the structure at the lower end of the second filter element (2). An opening is provided on the third water seal member (73) to form a third outlet (73a), which can allow the concentrated water filtered out by the second filter element (2) to flow downward through the third outlet (73a) to the concentrated water outlet (4) and be discharged. Wherein the first inlet (71a) is arranged closer to the radial inner side relative to the second inlet (72a), and the third outlet (73a) is arranged closer to the radial inner side relative to the second inlet (72a); or the first inlet (71a) is arranged closer to the radial outer side relative to the second inlet (72a), and the third outlet (73a) is arranged closer to the radial outer side relative to the second inlet (72a).

2. The segmented filter element assembly according to claim 1, characterized in that: The filter bottle cap (13) is covered on the upper end of the filter bottle body (12): A raw water inlet (3) is provided on the filter bottle cap (13), the lower end of the support member forms a pure water outlet (8), and a concentrated water outlet (4) is provided between the lower end of the filter bottle body (12) and the support member; or a raw water inlet (3) is provided at the lower end of the filter bottle body (12), the lower end of the support member forms a pure water outlet (8), and a concentrated water outlet (4) is provided between the lower end of the filter bottle body (12) and the support member.

3. The segmented filter element assembly according to any one of claims 1-2, characterized in that: The support member is in the structure of a central tube (5). The central tube (5) is a cylindrical tube with a hollow cavity. Flow guiding holes penetrating through the inner and outer walls are provided on its tube wall. The flow guiding holes include a first flow guiding hole (61) opposite to the position of the first filter element (1) and a second flow guiding hole (62) opposite to the position of the second filter element (2). The pure water filtered out by the first filter element (1) can enter the interior of the central tube (5) through the first flow guiding hole (61), and the pure water filtered out by the second filter element (2) can enter the interior of the central tube (5) through the second flow guiding hole (62).

4. The segmented filter element assembly according to claim 3, characterized in that: The central tube (5) sequentially includes a first shaft section (51), a second shaft section (52), and a third shaft section (53) along its axial direction. The first flow guiding hole (61) is opened on the first shaft section (51), the second flow guiding hole (62) is opened on the third shaft section (53), and no flow guiding hole is opened on the second shaft section (52). The first filter element (1) is wound around the outer periphery of the first shaft section (51), and the second filter element (2) is wound around the outer periphery of the third shaft section (53).

5. The segmented filter element assembly according to claim 4, characterized in that: The central pipe (5) is an injection molded part; the central pipe (5) is arranged such that its central axis is along the vertical direction. The first filter element (1) is located above the second filter element (2). The first shaft section (51), the second shaft section (52), and the third shaft section (53) are connected in sequence from top to bottom. The upper end of the central pipe (5) is a closed end, and raw water enters the first filter element (1) through above the first filter element (1).

6. The segmented filter element assembly according to any one of claims 1-2, characterized in that: The support member includes an end cap assembly (9), a first post-filter element (10), and a second post-filter element (11). The first post-filter element (10) has a first hollow cavity inside. The second post-filter element (11) has a second hollow cavity inside. The first post-filter element (10) is opposite to the first filter element (1). The pure water filtered out by the first filter element (1) can enter the first hollow cavity after further filtration through the first post-filter element (10). The pure water filtered out by the second filter element (2) can enter the second hollow cavity after further filtration through the second post-filter element (11). The first hollow cavity communicates with the second hollow cavity.

7. The segmented filter element assembly according to claim 6, characterized in that: The first filter element (1) is wound around the outer periphery of the first post-filter element (10), and the second filter element (2) is wound around the outer periphery of the second post-filter element (11). The first filter element (1) and the second filter element (2) are arranged at intervals.

8. The segmented filter element assembly according to claim 6, characterized in that: The end cap assembly (9) includes a first end cap (91), a second end cap (92), and a third end cap (93). The first end cap (91) is connected and arranged at an axial end of the first post-filter element (10) that is opposite to the second post-filter element (11). The second end cap (92) is connected and arranged between the first post-filter element (10) and the second post-filter element (11). The third end cap (93) is connected and arranged at an axial end of the second post-filter element (11) that is opposite to the first post-filter element (10).

9. The segmented filter element assembly according to claim 8, characterized in that: The first post-filter element (10) is located above the second post-filter element (11). The central axes of the first post-filter element (10) and the second post-filter element (11) coincide and extend along the vertical direction. The first end cap (91), the second end cap (92), and the third end cap (93) are arranged at intervals in sequence from top to bottom. The upper end of the first end cap (91) is a closed end, and raw water enters the first filter element (1) through above the first filter element (1). The lower end of the third end cap (93) is an open end, forming a pure water outlet (8). A second water sealing member (72) is provided at the lower end of the second filter element (2). The second water sealing member (72) can seal water, and a concentrated water outlet (4) is formed between the second water sealing member (72) and the third end cap (93).

10. The segmented filter element assembly according to claim 8, characterized in that: The first end cap (91), the second end cap (92), and the third end cap (93) are all injection-molded parts; the first post-filter element (10) and the second post-filter element (11) are both made of microporous filter media, and the pore diameter of the microporous filter media is 0.02 to 15 μm.

11. The segmented filter element assembly according to claim 10, characterized in that: The microporous filter media includes at least one of activated carbon and ceramics.

12. The segmented filter element assembly according to claim 8, wherein: One axial end of the first post-filter element (10) is adhesively bonded to the first end cap (91), and the other axial end of the first post-filter element (10) is adhesively bonded to the second end cap (92); one axial end of the second post-filter element (11) is adhesively bonded to the second end cap (92), and the other axial end of the second post-filter element (11) is adhesively bonded to the third end cap (93); The outer diameter of the first post-filter element (10) is less than or equal to the outer diameter of the first end cap (91), and the outer diameter of the first post-filter element (10) is also less than or equal to the outer diameter of the second end cap (92); The outer diameter of the second post-filter element (11) is less than or equal to the outer diameter of the second end cap (92), and the outer diameter of the second post-filter element (11) is also less than or equal to the outer diameter of the third end cap (93).

13. A water purification device, wherein: It includes the staged filter element assembly according to any one of claims 1-12.

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