CN217661715U - Stage type filter element assembly and water purifying device - Google Patents

Abstract

The utility model provides a stage formula filter element group spare and purifier, stage formula filter element group spare includes: the filter comprises a first filter element, a second filter element, a support member, a filter bottle body and a filter bottle cover, wherein the support member can support the first filter element and the second filter element, raw water can be filtered by the first filter element, pure water filtered by the first filter element can enter the support member and is discharged along the support member, concentrated water filtered by the first filter element can reach the second filter element for filtering, pure water filtered by the second filter element can also enter the support member and is discharged along the support member, and concentrated water filtered by the second filter element can pass through a concentrated water outlet and is discharged; filter flask body and filter flask lid enclose into inside cavity jointly, and first filter core, second filter core and supporting member all set up in inside cavity. Through the utility model discloses can realize that stage formula filter core filters on same center tube, improve the rate of recovery and can also reduce the volume simultaneously, solve the too big problem of volume that many filter cores establish ties.

Description

Stage type filter element assembly and water purifying device

Technical Field

The utility model belongs to the technical field of the water purification, concretely relates to stage formula filter element group spare and purifier.

Background

The high water yield is taken as the development trend of the water purifier, and the realization way mainly comprises the steps of adding a chemical scale inhibitor, connecting a plurality of filter elements in series to form stage type filtration and the like. However, although both techniques can achieve high recovery rates as above, they have the following problems:

problem 1: the addition of the chemical scale inhibitor can realize a good scale inhibition effect and improve the water yield of purified water, but the problem of sanitation and safety caused by the release of scale inhibiting substances exists;

problem 2: compared with a single-stage filter element, the technical recovery rate of the stages with the plurality of filter elements connected in series can be improved to a certain extent, but the technical route is to be optimized for the household machine pursuing the volume.

High water yield is realized without a chemical scale inhibitor, the stage type filter element technology has good application prospect, but the size is large due to the serial connection of a plurality of filter elements, so that the characteristics of the stage type filter technology can be effectively exerted if the stage type filter function is realized on the same central pipe, and meanwhile, the size problem caused by the plurality of filter elements can be solved. However, one of the problems is that the same central tube realizes the stage type filtering function, and the central tube must be used in a sectional manner, so that the effective flow passage length of the filter element is reduced, and the service life of the filter element is influenced.

Because traditional filter element group spare among the prior art exists can also reduce technical problem such as volume when can't improving the rate of recovery simultaneously, consequently the utility model discloses a stage formula filter element group spare and purifier are researched and designed.

SUMMERY OF THE UTILITY MODEL

Therefore, the to-be-solved technical problem of the utility model lies in overcoming traditional filter element group spare among the prior art and having the defect that can also reduce the volume when can't improving the rate of recovery simultaneously to a stage filter element group spare and purifier are provided.

The utility model provides a stage formula filter element group spare, it includes:

the filter comprises a first filter element, a second filter element, a support member, a filter bottle body and a filter bottle cover, wherein the support member can simultaneously support the first filter element and the second filter element, raw water can be filtered by the first filter element, pure water filtered by the first filter element can enter the support member and is discharged along the support member, concentrated water filtered by the first filter element can reach the second filter element for filtering, pure water filtered by the second filter element can also enter the support member and is discharged along the support member, and concentrated water filtered by the second filter element can pass through a concentrated water outlet and is discharged;

the filter flask body with the filter flask lid encloses into interior cavity jointly, first filter core, the second filter core with the supporting member all set up in the interior cavity.

In some embodiments, the filter bottle cap is disposed at an upper end of the filter bottle body:

a raw water inlet is formed in the lower end of the filter flask body, a pure water outlet is formed in the lower end of the supporting member, and a concentrated water outlet is formed between the lower end of the filter flask body and the supporting member; or a raw water inlet is formed in the filter flask cover, a pure water outlet is formed at the lower end of the supporting member, and a concentrated water outlet is formed between the lower end of the filter flask body and the supporting member.

In some embodiments, a first gap flow channel for water to flow 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 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 is formed between the outer periphery of the second filter element and the filter bottle body, and a fourth gap flow channel for water to flow is formed between the lower end of the second filter element and the filter bottle body.

In some embodiments, when the lower end of the filter bottle body is provided with a raw water inlet, the lower end of the second filter element is further provided with a first water sealing part, the first water sealing part can seal part of the structure of the lower end of the second filter element, and an opening is arranged on the first water sealing part to form a first outlet, so that concentrated water filtered by the second filter element can flow downwards to the concentrated water outlet through the first water sealing part and can be discharged; a second water sealing part is arranged at the outer peripheral position between the first filter element and the second filter element in the axial direction so as to seal raw water at the outer periphery of the second water sealing part and concentrated water at the inner periphery of the second water sealing part;

in some embodiments, when the filter bottle cover is provided with a raw water inlet, the lower end of the second filter element is further provided with a first water sealing part, the first water sealing part can seal part of the structure of the lower end of the second filter element, and the first water sealing part is provided with an opening to form a first outlet, so that concentrated water filtered by the second filter element can be allowed to flow downwards to the concentrated water outlet through the first outlet and be discharged; the periphery of first filter core with still be provided with the second between the filter flask body and seal water spare to seal the raw water of second water seal spare top.

In some embodiments, the bracing member is the structure of center tube, the center tube is for having hollow cavity's cylindrical pipe, is provided with the water conservancy diversion hole that runs through interior outer wall on its pipe wall, the water conservancy diversion hole include with the relative first water conservancy diversion hole in position of first filter core and with the relative second water conservancy diversion hole in position of second filter core, process the pure water that first filter core filtered out can pass through first water conservancy diversion hole gets into the inside of center tube, process the pure water that the second filter core filtered out can pass through the second water conservancy diversion hole gets into the inside of center tube.

In some embodiments, the central tube sequentially includes a first shaft section, a second shaft section and a third shaft section along an axial direction thereof, the first shaft section is provided with the first diversion hole, the third shaft section is provided with the second diversion hole, the second shaft section is not provided with the diversion hole, the first filter element is wound around an outer periphery of the first shaft section, and the second filter element is wound around an outer periphery of the third shaft section.

In some embodiments, the center tube is an injection molded part; the center tube is arranged with its central axis along vertical direction, first filter core is located the top of second filter core, first shaft segment second shaft segment with the third shaft segment is from last to connecting gradually down, the upper end of center tube is the blind end, and the raw water passes through the top of first filter core gets into in the first filter core.

In some embodiments, the center tube still includes fourth axial segment and fifth axial segment, third water conservancy diversion hole has still been seted up on the fifth axial segment, stage formula filter core still includes the third filter core, first filter core winding is in the periphery of first axial segment, process the thick water that the second filter core filtered out can reach third filter core department filters, process the pure water that the third filter core filtered out also can enter the inside of center tube and along the center tube is discharged, process the thick water that the third filter core filtered out can pass through thick water export and be discharged.

In some embodiments, the support member includes end cover assembly, first rearmounted filter core and the rearmounted filter core of second, the inside of first rearmounted filter core has first cavity, the inside of the rearmounted filter core of second has second cavity, first rearmounted filter core with first filter core is relative, the pure water that first filter core filtered out can pass through after first rearmounted filter core further filters and enter in the first cavity, the pure water that the second filter core filtered out can pass through after the rearmounted filter core further filters and enters in the second cavity, first cavity with second cavity intercommunication.

In some embodiments, the first filter element is wound around the outer periphery of the first rear filter element, the second filter element is wound around the outer periphery of the second rear filter element, and the first filter element and the second filter element are arranged at a distance.

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 connecting an axial end disposed on the first rear filter element opposite the second rear filter element, the second end cap connecting an axial end disposed between the first rear filter element and the second rear filter element, the third end cap connecting an axial end disposed on the second rear filter element opposite the first rear filter element.

In some embodiments, the first rear cartridge is positioned above the second rear cartridge, the first rear cartridge coinciding with a central axis of the second rear cartridge and extending in a vertical direction;

the first end cover, the second end cover and the third end cover are sequentially arranged at intervals from top to bottom;

the upper end of the first end cover is a closed end, and raw water enters the first filter element through the upper part of the first filter element;

the lower extreme of third end cover is the open end, forms to the pure water outlet, the lower extreme of second filter core is provided with second water sealing spare, the second water sealing spare can seal water, just form between second water sealing spare and the third end cover concentrated water outlet.

In some embodiments, the first end cap, the second end cap, and the third end cap are all injection molded parts; the first rear filter element and the second rear filter element are made of microporous filter materials, and the aperture of each microporous filter material is 0.02-15 um.

In some embodiments, the microporous filter comprises at least one of activated carbon and ceramic.

In some embodiments, one axial end of the first rear filter element is bonded to the first end cap, and the other axial end of the first rear filter element is bonded to the second end cap; one axial end of the second rear filter element is bonded with the second end cover, and the other axial end of the second rear filter element is bonded with the third end cover;

the outer diameter of the first rear filter element is less than or equal to that of the first end cover, and the outer diameter of the first rear filter element is less than or equal to that of the second end cover;

the outer diameter of the second rear filter element is smaller than or equal to that of the second end cover, and the outer diameter of the second rear filter element is smaller than or equal to that of the third end cover.

The utility model also provides a purifier, it includes preceding arbitrary the stage formula filter element group spare.

The utility model provides a pair of stage filter element group spare and purifier have following beneficial effect:

1. the utility model discloses a set up first and second filter core on same supporting member, the pure water that first filter core filtered out is discharged from the pure water outlet, the dense water (impurity water) that filters out gets into in the second filter core and filters, form the filtration of two segmentation of at least one level, compare and to many meticulous filter core series connections and can effectively realize the segmentation filtration technology, can realize the segmentation filter core filtering capability on same center tube, can improve the recovery utilization ratio to waste water, because every filter core that has now all needs a membrane shell, therefore the series-type filter core needs a plurality of membrane shells, the utility model discloses can effectively save the volume of membrane shell etc. finally can also reduce the volume when improving the recovery ratio, effectively solve the complete machine volume control problem that many filter cores series-connected brought; the stage type filter element filtering technology is realized on the same central pipe, the use of a plurality of filter bottles with filter elements connected in series is omitted, the integrated design of the filter elements can be realized, and the filter element has an important promotion effect on reducing the volumes of the filter elements and the whole machine; compared with the filter element technology with high recovery rate by using the scale inhibitor (the scale inhibitor is not needed by a first-stage two-section filter element (at least two sections), the stage type filter element technology has no sanitary and safety problems caused by the release of the scale inhibitor.

2. The utility model realizes the stage type filter element filtering technology on the same central pipe, saves the use of a plurality of filter flasks in series connection with filter elements, can realize the integrated design of the filter elements, and has important promotion effect on reducing the volume of the filter elements and the whole machine; the utility model also ensures that the fine filtering filter element can exert the stage type filtering function to improve the water yield of the purified water by arranging the supporting member comprising the end cover component and the two post-arranged filter elements, and simultaneously can realize the integration of the filter element and the post-arranged taste filter element, reduce the use number of the filter bottle and facilitate the small-volume design function of the whole machine; the fine filtering filter element and the rear taste filter element are integrated, and the small-volume design of the whole machine is facilitated.

3. The utility model discloses a structure is to the design, does not reduce the effective runner length of filter core when realizing stage formula filtering capability on same root center tube to effectively ensure filter core life when can realizing the high yield.

Drawings

FIG. 1 is a schematic view of the structure of the staged filter element assembly of embodiment 1 of the present invention;

FIG. 2 is a schematic structural view of a staged filter element assembly embodiment 2 of the present invention;

FIG. 3 is a structural diagram of the stage type filter element of the present invention when the glue line is spread;

FIG. 4 is a view of the structure of the stage-type filter element of the present invention;

FIG. 5 is a structural diagram of the gluing mode of the first-stage three-stage filter element of the present invention;

FIG. 6 is a schematic structural view of the first-stage three-stage filter element after the mold repair;

FIG. 7 is a schematic view of the structure of the central tube (pure injection molded part) and the filter element of the present invention;

FIG. 8 is a schematic view of the structure of the central tube (injection molding and filter material combination) and the filter element of the present invention;

fig. 9 is a schematic structural view of a one-stage two-stage filter element central tube (pure injection molding part) of the present invention.

The reference numbers in the figures denote:

1. a first filter element; 2. a second filter element; 3. a raw water inlet; 3a, a central pipe raw water inlet hole; 4. a concentrated water outlet; 5. a central tube; 51. a first shaft section; 52. a second shaft section; 53. a third shaft section; 54. a fourth shaft section; 55. a fifth shaft section; 61. a first flow guide hole; 62. a second flow guide hole; 63. a third flow guide hole; 71. a first water sealing member; 71a, a first outlet; 72. a second water sealing member; 73. a first glue line; 74. a second glue line; 8. a pure water outlet; 9. an end cap assembly; 91. a first end cap; 92. a second end cap; 93. a third end cap; 10. a first rear filter element; 11. a second rear filter element; 12. a filter flask body; 13. a filter bottle cap; 14. a water inlet separation net; 15a, a first blade; 15b, a second blade; 15c, a third blade; 15d, a blade IV; 16a, point one; 16b, point two; 16c, point three; 16d, point four; 17. a void; 101. a first clearance flow passage; 102. a second gap flow channel; 103. a third gap flow channel; 104. and a fourth gap flow passage.

Detailed Description

As shown in fig. 1-9, the present invention provides a staged filter element assembly, comprising:

the filter comprises a first filter element 1, a second filter element 2, a support member, a filter bottle body 12 and a filter bottle cover 13, wherein the support member can simultaneously support the first filter element 1 and the second filter element 2, raw water can be filtered by the first filter element 1, pure water filtered by the first filter element 1 can enter the support member and be discharged along the support member, concentrated water filtered by the first filter element 1 can reach the second filter element 2 for filtering, pure water filtered by the second filter element 2 can also enter the support member and be discharged along the support member, and concentrated water filtered by the second filter element 2 can pass through a concentrated water outlet 4 and be discharged;

the filter flask body 12 and the filter flask cover 13 jointly enclose an inner cavity, and the first filter element 1, the second filter element 2 and the support member are all arranged in the inner cavity; the upper end of the first filter element 1 is not provided with a water sealing part.

In order to solve the multistage formula filter core technique of antisludging agent, a plurality of filter core series connection to and the single filter core problem that exists in order to realize high water yield, the utility model provides a formula of the stage of sharing center tube filters a roll of formula membrane filter core structure, the concentrated water of preceding one-level filter core is as the raw water of back one-level filter core, thereby reaches the purpose of high water yield, has avoided the chemical release problem that chemical antisludging agent probably exists, the volume problem that a plurality of filter cores are established ties and are brought, and the pure filter core that realizes that high water yield brings of single filter core is dirty stifled the problem.

The utility model discloses a set up first and second filter core on same supporting member, the pure water that first filter core filtered out is discharged from the pure water outlet, the dense water (impurity water) that filters out gets into in the second filter core and filters, form the filtration of two segmentation of at least one level, compare and to many meticulous filter core series connections and can effectively realize the segmentation filtration technology, can realize the segmentation filter core filtering capability on same center tube, can improve the recovery utilization ratio to waste water, because every filter core that has now all needs a membrane shell, therefore the series-type filter core needs a plurality of membrane shells, the utility model discloses can effectively save the volume of membrane shell etc. finally can also reduce the volume when improving the recovery ratio, effectively solve the complete machine volume control problem that many filter cores series-connected brought; the stage type filter element filtering technology is realized on the same central pipe, the use of a plurality of filter bottles with filter elements connected in series is omitted, the integrated design of the filter elements can be realized, and the filter element has an important promotion effect on reducing the volumes of the filter elements and the whole machine; compared with the filter element technology with high recovery rate by using the scale inhibitor (the scale inhibitor is not needed by a first-stage two-section filter element (at least two sections), the stage type filter element technology has no sanitary and safety problems caused by the release of the scale inhibitor.

The utility model discloses: 1) The primary two-section type filter element filtering technology is realized on the same central pipe, the use of two filter elements which are connected in series to play the primary two-section filtering technology and a plurality of filter bottles is reduced, the integrated design of the filter elements is realized, and the filter element integrated filter has an important promotion effect on reducing the volumes of the filter elements and the whole machine;

2) Compared with the filter core technology which realizes high recovery rate by using a scale inhibitor means, the stage type filter core technology has no problem of sanitation and safety caused by the release of scale inhibiting substances;

3) Compared with a single filter element, the high water yield is realized by improving the recovery rate, the high water yield can be realized by controlling the relation between the flow and the recovery rate, and the service life of the filter element can be effectively prolonged;

4) Compared with a single-stage filter element technology, the stage type filter element technology can improve the water yield of filter element water purification.

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

a raw water inlet 3 is formed at the lower end of the filter flask body 12, a pure water outlet 8 is formed at the lower end of the supporting member, and a concentrated water outlet 4 is formed between the lower end of the filter flask body 12 and the supporting member; or, 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 arranged between the lower end of the filter bottle body 12 and the support member. The two different structural forms of the present invention, namely embodiment 1, as shown in fig. 1, raw water enters from the lower end of the filter flask body at the lower end, enters the first filter element after reaching the upper end, and then flows downwards in sequence, the concentrated water outlet and the pure water outlet are both located at the lower end, and finally, the filtered pure water (without impurities) and the filtered concentrated water (with impurities) are discharged through the pure water outlet and the concentrated water outlet respectively; example 2 as shown in fig. 2, raw water was introduced from the upper end of the filter flask cap, and flowed down in sequence, and the concentrated water outlet and the pure water outlet were both located at the lower end, and finally, the filtered pure water (without impurities) and concentrated water (with impurities) were discharged through the pure water outlet and the concentrated water outlet, respectively.

The utility model provides an integrated form formula membrane filter core of book and structure with stage formula filtering capability, according to its structural feature, its realizable stage formula function is not limited to one-level two sections, still includes the one-level three-section, and more multistage even, consequently the water purification water yield that can reach as required selects specific filter core structure. The utility model discloses in, mainly explain with regard to filter core structure, the preparation method that same root center tube realized two sections functions of one-level, specifically as follows:

the utility model provides a stage formula filter core is concerned with a roll formula membrane filter core field, and a roll formula membrane is including receiving and straining, reverse osmosis etc.. The nanofiltration and reverse osmosis filter element generally comprises three water gaps, a raw water inlet, a concentrated water outlet and a pure water outlet, and the two forms are arranged according to the positions of the water gaps: 1. the three water gaps are distributed at the same end; 2. one ends of the concentrated water outlet and the pure water outlet are arranged, and the other ends of the raw water inlet are arranged independently. The following description is made specifically based on the arrangement of the positions of the water gaps to realize the primary two-stage filtering function based on the same central pipe.

In some embodiments, a first gap flow passage 101 through which water can flow is formed between the upper end of the first filter element 1 and the filter bottle cap 13, a second gap flow passage 102 through which water can flow is formed between the outer circumference of the first filter element 1 and the filter bottle body 12, a third gap flow passage 103 through which water can flow is formed between the outer circumference of the second filter element 2 and the filter bottle body 12, and a fourth gap flow passage 104 through which water can flow is formed between the lower end of the second filter element 2 and the filter bottle body 12. The utility model discloses a first clearance runner between first filter core upper end and the filter flask lid, the second clearance runner of first filter core periphery, the third clearance runner of second filter core periphery and the fourth clearance runner of second filter core lower extreme can make as the embodiment shown raw water loop through fourth clearance runner, third clearance runner, second clearance runner and first clearance runner and enter into the upper end of first filter core to in entering first filter core, this is the utility model discloses an embodiment 1's preferred structural style.

In some embodiments, when the raw water inlet 3 is arranged at the lower end of the filter body 12, the lower end of the second filter element 2 is further provided with a first water sealing member 71, the first water sealing member 71 can seal part of the structure at the lower end of the second filter element 2, and an opening is arranged on the first water sealing member 71 to form a first outlet 71a, which can allow the concentrated water filtered by the second filter element 2 to flow downwards to the concentrated water outlet 4 through the first water sealing member 71 and be discharged; a second water sealing member 72 is arranged at an outer circumferential position between the first filter element 1 and the second filter element 2 in the axial direction, so that raw water at the outer circumference of the second water sealing member 72 and concentrated water at the inner circumference of the second water sealing member 72 are sealed;

when the raw water inlet 3 is arranged on the filter bottle cap 13, the lower end of the second filter element 2 is further provided with a first water sealing member 71, the first water sealing member 71 can seal part of the structure at the lower end of the second filter element 2, and the first water sealing member 71 is provided with an opening to form a first outlet 71a, so that the concentrated water filtered by the second filter element 2 can flow downwards to the concentrated water outlet 4 through the first outlet 71a and be discharged; a second water sealing member 72 is further disposed between the periphery of the first filter element 1 and the filter flask body 12 to seal the raw water above the second water sealing member 72.

The embodiment 1, can separate between the raw water that the raw water and the second filter core of second filter core lower extreme crossed the thick water that filters through the first water sealing spare of second filter core lower extreme, set up the second water sealing spare through the periphery of first and second filter core interval position and can effectively separate between the raw water of its interior week thick water and periphery, the utility model discloses an embodiment 1's raw water gets into between second filter core and the filter flask body from the below to upwards reach first filter core department, can filter in getting into first filter core along radial direction, also can follow the top of first filter core and carry out the filtering action in getting into first filter core, the pure water of crossing off gets into the inside of center tube from first water conservancy diversion hole in order to get rid of, and the pure water of crossing off filters in getting into the second filter core downwards along the axial.

The embodiment 2, can separate between the raw water that filters out the thick water through first water sealing spare of second filter core lower extreme and second filter core through the raw water of second filter core lower extreme, can effectively separate between the raw water of its interior thick water of week and periphery through the second water sealing spare that sets up between first filter core and the filter flask body, also prevent that the raw water from falling downwards and can't play effective filterable effect from the clearance department between first filter core and the filter flask body, the pure water of crossing filters out gets into the inside of center tube from first water conservancy diversion hole in order to get rid of, the pure water of crossing filters in getting into the second filter core downwards along the axial.

1. The water gaps are distributed at the same end. Fig. 1 is a schematic structural view of an integrated roll-type membrane filter element with a one-stage two-stage filtering function, which is arranged at the same end of a water gap. Raw water enters the filter flask body from a raw water port, the raw water enters the end part of the first filter element 1 through the periphery of the second filter element 2, the raw water enters the first filter element 1 to be filtered, the pure water is collected through a pure water diversion port (a first diversion hole 61) on the central tube and enters the central tube, concentrated water enters the end face of the second filter element 2 opposite to the first filter element 1 and is filtered and purified again as the raw water of the second filter element 2, the water production rate of the purified water is improved, the pure water is collected through the pure water diversion port (a second diversion hole 62) on the central tube and flows out from a pure water outlet after being converged with the pure water of the first filter element 1, and the concentrated water is discharged from the concentrated water port. The first filter element 1 and the second filter element 2 are formed by gluing and repairing the same membrane page, and the subsequent parts are mentioned for forming non-independent filter elements at the same time.

In order to realize the waterway function, the waterway protection device further comprises a water sealing member (a first water sealing member 71) and a water sealing member (a second water sealing member 72). The first water sealing part 71 is mainly used for separating concentrated water of the second filter element 2 from raw water of the first filter element 1, the inner cavity of the first water sealing part 71 sleeves the end part of the second filter element 2, and the periphery of the first water sealing part and the periphery of the second filter element 2 are wound, fixed and sealed through adhesive tapes; the second seals water spare 72 mainly separates the dense water and the raw water of first filter core 1, realizes rivers and does not mix, and it is arranged in the space that forms after first filter core 1 and the membrane is repaiied to second filter core 2, and this seals water spare has T type characteristic, and T type part gets into in the space, and both end frames are in the periphery of first filter core 1 and second filter core 2 simultaneously, seal through sticky tape and two parts filter core finally.

2. The different ends of the water gap are distributed. Fig. 2 is a schematic structural view of an integrated roll-type membrane filter element with a first-stage two-stage filtering function arranged at the different end of a water gap. Raw water enters the filter flask from a raw water port, enters the end face of the first filter element 1 through a raw water inlet hole in the central tube and is filtered, pure water is collected through a pure water diversion port (a first diversion hole 61) in the central tube, concentrated water flows into a gap formed after membrane repair, enters the end face of the second filter element 2 under the drive of pressure, and is filtered and purified again as the raw water of the filter element, the pure water is collected through the pure water diversion port (a second diversion hole 62) in the central tube and flows out through the pure water port after being converged with the pure water of the first filter element 1, and the concentrated water flows out from the concentrated water port.

In order to realize the water channel function, the integrated filter element with the water outlet distributed at the different end further comprises a water sealing part (a first water sealing part 71) and a water sealing part (a second water sealing part 72). The positions of the first water sealing piece 71 distributed at the same end of the water gap are the same as the fixing mode and the structure of the second filter element 2, and the difference is expressed in the action, wherein the first water sealing piece 71 mainly has the function of separating the raw water of the second filter element 2 from the concentrated water of the water produced by the second filter element 2; the second water sealing part 72 is positioned on one side of the first filter element 1 far away from the second filter element 2, the whole shape of the second water sealing part is Y-shaped, the big end of the second water sealing part is close to the end face of the first filter element 1, the small end of the second water sealing part is used for sleeving the first filter element 1 into the first filter element 1 to realize tight fit, meanwhile, the sealing is realized through the outer peripheral face of the adhesive tape and the first filter element 1, and the function of the second water sealing part is that the separation of the raw water of the first filter element 1 and the generated concentrated water is realized.

The difference of the filter element of the first-stage and the second-stage water gap in the two forms is the waterway and the seal after the filter bottle is assembled; the same point is the basic one-stage two-section filter element used. The basic filter element manufacturing is explained as follows, including glue line setting and membrane repairing, specifically as follows:

and arranging a glue line. In the technical scheme, a stage type filter element technology is realized on the same central pipe through gluing and membrane repairing, and a specific gluing mode is shown in figure 3. After the membrane is placed on the first membrane sheet in the manner mentioned in the membrane unit, gluing is performed according to fig. 2. Because the technical scheme is a stage type filter element technology and is a filter element integrated design, the first and second stage filter elements are respectively referred to as a first filter element and a second filter element for short. As can be seen from fig. 2, the glue lines of the first filter element 1 and the second filter element 2 are glued on three sides except for the glue lines close to the central tube without being glued on the membrane; the first filter element 1 and the second filter element 2 are two independent and complete glue lines, the glue lines are perpendicular to the central tube and do not coincide with the outer edge of the membrane, and a certain distance is required to be reserved for rolling and pointing the filter elements, repairing the membrane after the glue is cured, so as to ensure the sealing property of the filter elements; the width of the glue line of each filter element needs to be larger than the width of the corresponding filter element water guide opening to prevent the glue from blocking the water guide opening to influence water production; a distance d1 needs to be reserved between the adjacent glue lines of the first filter element 1 and the second filter element 2, and the distance d1 is reserved for repairing the membrane after the filter elements are cured so as to form a stage type filter element (see membrane repairing description); the glue line position of the second filter element 2 is close to the pure water outlet end; every membrane page or leaf of putting all needs to beat according to the mode of beating glue that fig. 3 shows and glues, and last membrane page or leaf is beaten and is glued after having placed and rolls again, realizes that the filter core is rolled up to the cylinder, treats to repair the membrane operation after the glue solidification.

And (5) repairing the film. In the technical scheme, the stage type filter element technology is realized by arranging and repairing the membrane on the same central pipe by means of the glue line, and the specific membrane repairing mode is shown in figure 4. After the filter element is solidified, the corresponding membrane repairing blade is used for repairing the membrane, and in order to realize membrane repairing, the technical scheme is explained in a 4-blade membrane repairing mode. Taking a central tube which is not rolled with a filter element, adjusting the position of the blade according to the position of a corresponding point I of the blade I, the position of a corresponding point II of the blade II, and the like, starting a membrane repairing device (not specifically described) to remove a membrane to be removed, wherein a gap is arranged between the first filter element 1 and the second filter element 2 after a sample form of the repaired membrane is obtained by removing a trimming part, and the gap is used as a concentrated water outlet end of the first filter element 1 and also used as a raw water inlet end of the second filter element 2, so that one-stage two-stage filtration is realized.

By adopting the technical scheme, the trimmed filter element has different treatment modes for the gap between the first filter element 1 and the second filter element 2, and the filter elements of the water gaps in two forms are explained.

The filter element obtained by the method for realizing the filter element gluing and membrane repairing treatment of the primary two-section stage filter element filtering technology on the same central tube has advantages in the aspects of safety, volume, performance and the like compared with other ways for realizing high water yield.

In addition, the filter element structure of the technical scheme can also realize a one-stage three-stage filtering function, and the specific gluing process and the filter element state after membrane repair are shown in fig. 5 and 6, which are not specifically described here.

In some embodiments, the support member is a structure of a center tube 5, the center tube 5 is a cylindrical tube with a hollow cavity, and flow guide holes penetrating through inner and outer walls are formed in a tube wall of the cylindrical tube, the flow guide holes include a first flow guide hole 61 opposite to the position of the first filter element 1 and a second flow guide hole 62 opposite to the position of the second filter element 2, pure water filtered by the first filter element 1 can enter the center tube 5 through the first flow guide hole 61, and pure water filtered by the second filter element 2 can enter the center tube 5 through the second flow guide hole 62.

This is the utility model discloses a support member's a preferred structural style, like fig. 6, the utility model discloses with the preferred structure (whole injection molding that sets the center tube of support member), can play under the effect of effective support to first and second filter core, can also filter the inside cavity of the leading-in center tube of pure water that first filter core crossed effectively through the first water conservancy diversion hole of seting up on it, and derive the pure water, the second water conservancy diversion hole is filtered the second filter core effectively and is derived the inside cavity of the leading-in center tube of pure water of crossing, and the impurity water (dense water) that first filter core crossed filters gets into in the second filter core and filters, can effectively improve the filter effect to dense water, improve the waste water recovery rate, thereby improve the water yield, the volume has been reduced simultaneously, make the structure more compact.

Raw water enters from the end face of the first filter element 1 close to the tail end of the central tube, pure water is collected into the central tube through the diversion holes, concentrated water serving as raw water of the second filter element 2 enters from the end close to the concentrated water of the first filter element 1, the pure water is collected through the diversion holes and then is converged with the pure water of the first filter element 1 to be discharged from the pure water port, and the concentrated water is discharged from the end face.

In some embodiments, the central tube 5 includes, in order along an axial direction thereof, a first shaft section 51, a second shaft section 52, and a third shaft section 53, the first shaft section 51 is provided with the first guide hole 61, the third shaft section 53 is provided with the second guide hole 62, the second shaft section 52 is not provided with the guide holes, the first filter element 1 is wound around an outer circumference of the first shaft section 51, and the second filter element 2 is wound around an outer circumference of the third shaft section 53. Utility model's the center tube is preferred to be set to along axial first, second and third shaft part, set up first water conservancy diversion hole on the first shaft part, first filter core winding is in the periphery of first shaft part, can cross the pure water that first filter core crossed and lead to the inside cavity of center tube through first water conservancy diversion hole, set up second water conservancy diversion hole on the third shaft part, second filter core winding is in the periphery of third shaft part, can cross the pure water that the second filter core crossed and lead to the inside cavity of center tube through second water conservancy diversion hole. As shown in fig. 9, a first-stage two-stage center tube is realized, a distance D2 needs to be reserved between D1 and D3 (D1 indicates the axial length of the first filter element, D3 indicates the axial length of the second filter element, and D2 indicates the axial length of the space between the two filter elements), so as to form two filter elements when the filter element is used for repairing the membrane, wherein the upper end starting surface of D2 is the end surface of the first filter element close to the second filter element, and the end surface is the end surface of the second filter element close to the first filter element. The utility model discloses a two sections center tubes of one-level can be integrated on same center tube with two sections techniques of one-level that many filter cores of tradition were established ties, and the use that reduces filter flask quantity when realizing high yield. But the filtering function is only the purifying function of the fine filtering filter element and is single-stage purification.

In some embodiments, the central tube 5 is an injection molded piece; the central tube 5 is arranged with its central axis along the vertical direction, the first filter element 1 is located the top of the second filter element 2, the first shaft section 51 the second shaft section 52 and the third shaft section 53 connect gradually from top to bottom, the upper end of the central tube 5 is the closed end, and raw water passes through the top of the first filter element 1 enters into in the first filter element 1.

The central tube of the utility model is preferably an integral injection molding piece (further preferably integral plastic integral injection molding), which can effectively support the inner circumference of the filter element and can guide the pure water; the central tube that arranges along the vertical direction of the central axis forms from last first, second and third shaft segment to down, and first filter core and second filter core are also from last arranging down, and the central tube upper end is sealed to it is inside not to allow raw water to get into the central tube, and the raw water import is the top of first filter core, and the raw water filters in getting into first filter core, and the inside of the pure water rethread first water conservancy diversion hole entering central tube of straining.

As shown in fig. 5 to 6, in some embodiments, the central tube 5 further includes a fourth axial segment 54 and a fifth axial segment 55, the fifth axial segment 55 is further provided with a third diversion hole 63, the segment-type filter element further includes a third filter element, the first filter element 1 is wound around the periphery of the first axial segment 51, the concentrate filtered by the second filter element 2 can reach the third filter element for filtering, the pure water filtered by the third filter element can also enter the inside of the central tube and be discharged along the central tube, and the concentrate filtered by the third filter element can pass through the concentrate outlet 4 and be discharged. This is the utility model discloses an embodiment 3's preferred structural style, as shown in fig. 6, it sets up to five shaft segments on the axial direction promptly to there is the water conservancy diversion hole of triplex at the beginning, can realize the purification and filtration effect of one-level multistage, and pure water conservancy diversion hole position is seted up to cooperation level segmentation filter core demand, still can realize one-level multistage purification performance.

As shown in fig. 8, in some embodiments, the support member includes an end cap assembly 9, a first rear filter element 10 and a second rear filter element 11, the first rear filter element 10 has a first hollow cavity inside, the second rear filter element 11 has a second hollow cavity inside, the first rear filter element 10 is opposite to the first filter element 1, pure water filtered by the first filter element 1 can be further filtered by the first rear filter element 10 and enter the first hollow cavity, pure water filtered by the second filter element 2 can be further filtered by the second rear filter element 11 and enter the second hollow cavity, and the first hollow cavity is communicated with the second hollow cavity. The utility model discloses a support component's another preferred structural style, support component include end cover subassembly and two rear filter element's the form of setting, when guaranteeing that meticulous filter element exerts stage formula filtering capability and promotes the water yield of water purification, still can realize promoting the filter element integration level with rear taste filter element integration, reduce filter flask use quantity, do benefit to the small volume design function of complete machine; the fine filtering filter element and the rear taste filter element are integrated, and the small-volume design of the whole machine is facilitated.

The utility model discloses a stage formula filter element group spare possesses two sections purification performance of one-level, promotes the water yield, can realize closely laminating with rearmounted filter core simultaneously, realizes two-stage purification performance on a filter element group spare. Its structure is the same basically with the center tube filter core of pure injection molding, and the difference point is formed by injection molding and many micropore filter media combination at the center tube, can realize that one-level two sections purify and promote the water yield, can realize meticulous filtration filter core product water normal position simultaneously and purify, realizes two unification filter core structures.

In some embodiments, the first filter element 1 is wound around the outer periphery of the first rear filter element 10, the second filter element 2 is wound around the outer periphery of the second rear 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, and the first water sealing member 71 is opposite to the second end cover 92. The first filter element is wound on the periphery of the first rear filter element, so that pure water filtered by the first filter element can be conveyed to the first rear filter element radially inwards for further filtering and purification, and the second filter element is wound on the periphery of the second rear filter element, so that pure water filtered by the second filter element can be conveyed to the second rear filter element radially inwards for further filtering and purification; the first water sealing piece can separate and seal the concentrated water on the inner periphery of the first water sealing piece from the raw water on the outer periphery of the first water sealing piece, so that the concentrated water and the raw water are prevented from being mixed.

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 to an axial end of the first rear filter element 10 opposite the second rear filter element 11, the second end cap 92 is connected to the first rear filter element 10 and the second rear filter element 11, and the third end cap 93 is connected to an axial end of the second rear filter element 11 opposite the first rear filter element 10. This is the utility model discloses an end cover assembly's preferred structural style, first end cover is used for supporting and fixing the one end of first rearmounted filter core promptly, and the second end cover is used for supporting and fixing the other end of first rearmounted filter core, and the second end cover can also support fixedly the one end of second rearmounted filter core, and the third end cover supports fixedly the other end of second rearmounted filter core.

The support member shown in fig. 8 is composed of an injection molding part and a filter material, so that the purpose of high water yield of the fine filter element can be achieved by one stage and two sections, and meanwhile, the support member and the rear filter element of the fine filter element can be compounded in situ to form a stage type filter element with two-stage filtering functions. The filter comprises a first end cover 91, a second end cover 92, a third end cover 93, a first rear filter element 10 and a second rear filter element 11.

The outer diameter and the effective inner diameter of the 3 end covers are the same, so that the initial filter element is convenient to manufacture; one end of the first end cover 91 is sealed, so that the purpose of waterway separation is realized; the two ends of the second end cover 92 are communicated with each other, so as to realize water passage communication; the third end cap 93 is also communicated with two ends of the water pipe, so that the collected pure water is discharged, and meanwhile, the outer surface of the third end cap, which is close to the water outlet end, is provided with a sealing groove characteristic and is used for realizing water path separation.

In some embodiments, the first rear filter element 10 is located above the second rear filter element 11, and the first rear filter element 10 coincides with the central axis of the second rear filter element 11 and extends in the vertical direction;

the first end cover 91, the second end cover 92 and the third end cover 93 are sequentially arranged at intervals from top to bottom;

the upper end of the first end cover 91 is a closed end, and raw water enters the first filter element 1 through the upper part of the first filter element 1;

the lower end of the third end cover 93 is an open end and forms a pure water outlet 8, the lower end of the second filter element 2 is provided with a second water sealing member 72, the second water sealing member 72 can seal water, and the concentrated water outlet 4 is formed between the second water sealing member 72 and the third end cover 93.

This is the utility model discloses a further preferred structural style of the support member of injection molding + filter media combination, the first and the rearmounted filter core of second that vertical direction was arranged promptly, can make the raw water from last to filtering in flowing into first filter core down, carry the dense water in the first filter core to the second filter core in again and filter, form the two segmentation filtration of one-level, the pure water opening of third end cover below formation can effectively derive the pure water after the rearmounted filter core filters, dense water export is used for exporting the impurity water of second filter core filtration.

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 rear filter element 10 and the second rear filter element 11 are made of microporous filter materials, and the aperture of each microporous filter material is 0.02-15 um. The utility model discloses an all make through the injection molding of three end cover, can effectively play the fixed effect of support, first and second rearmounted filter core adopt the micropore filter media to make and to go on further meticulous filterable effect to first and second filter core filtration pure water off, can improve the taste etc. of water, improve filter fineness.

In some embodiments, the microporous filter comprises at least one of activated carbon and ceramic. Compare in the visual hole of injection molding, its product water that can realize meticulous filtration filter core realizes face formula contact with rearmounted filter core, and purifying effect is better. The length ratio of the first post-filter element 10 to the second post-filter element 11 is preferably 1-2.5.

In some embodiments, one axial end of the first rear filter element 10 is bonded to the first end cap 91, and the other axial end of the first rear filter element 10 is bonded to the second end cap 92; one axial end of the second rear filter element 11 is bonded to the second end cap 92, and the other axial end of the second rear filter element 11 is bonded to the third end cap 93;

the outer diameter of the first rear filter element 10 is less than or equal to the outer diameter of the first end cover 91, and the outer diameter of the first rear filter element 10 is also less than or equal to the outer diameter of the second end cover 92;

the outer diameter of the second rear filter element 11 is smaller than or equal to the outer diameter of the second end cap 92, and the outer diameter of the second rear filter element 11 is also smaller than or equal to the outer diameter of the third end cap 93.

The first rear filter element and the two end covers of the utility model are preferably fixed in a bonding way, the first rear filter element 10 is cylindrical, the outer diameter of the first rear filter element is less than or equal to the outer diameter of the first end cover 91 and the second end cover 92, the inner diameter of the first rear filter element is equal to the outer wall of the effective inner diameter of the two end covers, the lamination is realized, and the connection of the first rear filter element 10 and the two end covers is fixed on the matched end faces through glue bonding;

the second rear filter element 11 is cylindrical, the outer diameter of the second rear filter element is smaller than or equal to the outer diameter of the second end cover 92 and the outer diameter of the third end cover 93, the inner diameter of the second rear filter element is equal to the outer wall of the effective inner diameter of the two end covers, the second rear filter element is attached to the outer wall of the effective inner diameter of the two end covers, and the second rear filter element 11 is connected with the two end covers and fixed on the matched end faces through glue in a bonding mode.

The utility model also provides a purifier, it includes preceding arbitrary the stage formula filter element group spare.

The utility model provides an integrated roll-type membrane filter element with stage type filtering function, compared with the traditional method that a plurality of filter elements are connected in series to realize the stage type function, the integrated roll-type membrane filter element can share one central tube to realize the function, has promoting effect on reducing the volume of the filter element, and has the characteristic of high water yield of the stage type filter element filtering technology; meanwhile, by combining the characteristics of the filter element provided by the technical scheme, the achievable stage-type functions are not limited to one stage and two sections and comprise one stage and multiple sections (more than or equal to 2 sections), so that the water yield of purified water has adjustable characteristics.

The utility model also ensures that the fine filtering filter element can exert the stage type filtering function to improve the water yield of the purified water by arranging the supporting member comprising the end cover component and the two post-arranged filter elements, and simultaneously can realize the integration of the filter element and the post-arranged taste filter element, reduce the use number of the filter bottle and facilitate the small-volume design function of the whole machine; the fine filtering filter element and the rear taste filter element are integrated, and the small-volume design of the whole machine is facilitated.

The utility model has the advantages that the structure is designed, the effective flow passage length of the filter element is not reduced while the stage type filtering function is realized on the same central tube, so that the service life of the filter element is effectively ensured while the high water yield is realized; the utility model discloses still seal structure and clearance passageway that the axial end and the radial end through first filter core and second filter core set up form compact runner structure, improve filtration efficiency. The utility model provides an integrated roll-type membrane filter element with stage type filtering function, compared with the traditional multi-filter element series connection to realize the stage type function, the integrated roll-type membrane filter element can share one central tube to realize, has promotion effect on reducing the volume of the filter element, and has the characteristic of high water yield of the stage type filter element filtering technology; simultaneously, combine the filter core characteristic that this technical scheme provided, its grade segment formula function that can realize is not limited to one-level two sections, including one-level multistage function (being more than or equal to 2 sections), therefore the water yield of clean water has adjustable characteristic.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention. The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims (16)

1. A staged filter element assembly, comprising: the method comprises the following steps:

the filter comprises a first filter element (1), a second filter element (2), a supporting member, a filter body (12) and a filter cover (13), wherein the supporting member can simultaneously support the first filter element (1) and the second filter element (2), raw water can be filtered by the first filter element (1), pure water filtered by the first filter element (1) can enter the supporting member and be discharged along the supporting member, concentrated water filtered by the first filter element (1) can reach the second filter element (2) for filtering, pure water filtered by the second filter element (2) can also enter the supporting member and be discharged along the supporting member, and concentrated water filtered by the second filter element (2) can pass through a concentrated water outlet (4) and be discharged;

the filter flask body (12) and the filter flask cover (13) jointly enclose an inner cavity, and the first filter element (1), the second filter element (2) and the supporting member are all arranged in the inner cavity.

2. The staged filter element assembly as defined in claim 1, wherein:

the filter flask lid (13) lid is located the upper end of filter flask body (12):

a raw water inlet (3) is formed in the lower end of the filter flask body (12), a pure water outlet (8) is formed in the lower end of the supporting member, and a concentrated water outlet (4) is formed between the lower end of the filter flask body (12) and the supporting member; or a raw water inlet (3) is formed in the filter bottle cover (13), a pure water outlet (8) is formed at the lower end of the supporting member, and a concentrated water outlet (4) is formed between the lower end of the filter bottle body (12) and the supporting member.

3. The staged filter element assembly of claim 2, wherein:

the upper end of first filter core (1) with form first clearance runner (101) that can supply water circulation between filter bottle lid (13), the periphery of first filter core (1) with form second clearance runner (102) that can supply water circulation between filter bottle body (12), the periphery of second filter core (2) with form third clearance runner (103) that can supply water circulation between filter bottle body (12), the lower extreme of second filter core (2) with form fourth clearance runner (104) that can supply water circulation between filter bottle body (12).

4. The staged filter element assembly of claim 2, wherein:

when the lower end of the filter bottle body (12) is provided with a raw water inlet (3), the lower end of the second filter element (2) is further provided with a first water sealing part (71), the first water sealing part (71) can seal part of the structure of the lower end of the second filter element (2), the first water sealing part (71) is provided with an opening to form a first outlet (71 a), and concentrated water filtered by the second filter element (2) can be allowed to flow downwards to the concentrated water outlet (4) through the first water sealing part (71) and be discharged; a second water sealing part (72) is arranged at the outer peripheral position between the first filter element (1) and the second filter element (2) in the axial direction, so that raw water at the outer periphery of the second water sealing part (72) and concentrated water at the inner periphery of the second water sealing part (72) are sealed;

when the raw water inlet (3) is arranged on the filter bottle cap (13), the lower end of the second filter element (2) is also provided with a first water sealing part (71), the first water sealing part (71) can seal part of the structure of the lower end of the second filter element (2), the first water sealing part (71) is provided with an opening to form a first outlet (71 a), and concentrated water filtered by the second filter element (2) can be allowed to flow downwards to the concentrated water outlet (4) through the first outlet (71 a) and be discharged; the periphery of first filter core (1) with still be provided with second water sealing spare (72) between filter flask body (12) to raw water to second water sealing spare (72) top is sealed.

5. The staged filter cartridge assembly according to any one of claims 1-4, wherein:

the utility model discloses a water purification filter, including support component, center tube (5), water conservancy diversion hole, first water conservancy diversion hole (61) and second water conservancy diversion hole (62) that the position of second filter core (2) is relative, the support component is the structure of center tube (5), for the cylindrical pipe that has hollow cavity, be provided with the water conservancy diversion hole that runs through interior outer wall on center tube (5) of center tube (5), the water conservancy diversion hole include with first water conservancy diversion hole (61) that the position of first filter core (1) is relative and with the second water conservancy diversion hole (62) that the position of second filter core (2) is relative, process first filter core (1) pure water of filtering off can pass through first water conservancy diversion hole (61) gets into the inside of center tube (5), process second filter core (2) pure water of filtering off can pass through second water conservancy diversion hole (62) get into the inside of center tube (5).

6. The staged filter element assembly of claim 5, wherein:

center tube (5) include first shaft segment (51), second shaft segment (52) and third shaft segment (53) in proper order along its axial, set up on first shaft segment (51) first water conservancy diversion hole (61), set up second water conservancy diversion hole (62) on third shaft segment (53), do not set up the water conservancy diversion hole on second shaft segment (52), first filter core (1) winding is in the periphery of first shaft segment (51), second filter core (2) winding is in the periphery of third shaft segment (53).

7. The staged filter element assembly of claim 6, wherein:

the central pipe (5) is an injection molding piece; center tube (5) arrange to be along vertical direction for its central axis, first filter core (1) is located the top of second filter core (2), first axle section (51) second axle section (52) with third axle section (53) are from last to connecting gradually down, the upper end of center tube (5) is the blind end, and the raw water passes through the top of first filter core (1) gets into in first filter core (1).

8. The staged filter element assembly as defined in claim 6, wherein:

center tube (5) still include fourth axial segment (54) and fifth axial segment (55), third water conservancy diversion hole (63) have still been seted up on fifth axial segment (55), stage formula filter core still includes the third filter core, first filter core (1) winding is in the periphery of first axial segment (51), process the thick water that second filter core (2) were strained can reach third filter core department filters, process the pure water that the third filter core was strained also can get into the inside of center tube and along the center tube is discharged, process the thick water that the third filter core was strained can pass through thick water export (4) and is discharged.

9. The staged filter element assembly according to any one of claims 1-4, wherein:

the utility model discloses a filter element, including support member, first rearmounted filter core (10), first rearmounted filter core (11), the inside of first rearmounted filter core (10) has first cavity, the inside of second rearmounted filter core (11) has second cavity, first rearmounted filter core (10) with first filter core (1) is relative, the pure water that filters out of first filter core (1) can pass through after first rearmounted filter core (10) further filters and enter in the first cavity, the pure water that filters out of second filter core (2) can pass through after second rearmounted filter core (11) further filters and enter in the second cavity, first cavity with second cavity intercommunication.

10. The staged filter element assembly as defined in claim 9, wherein:

the first filter element (1) is wound on the periphery of the first rear filter element (10), the second filter element (2) is wound on the periphery of the second rear filter element (11), and the first filter element (1) and the second filter element (2) are arranged at intervals.

11. The staged filter element assembly as defined in claim 9, wherein:

the end cover assembly (9) comprises a first end cover (91), a second end cover (92) and a third end cover (93), the first end cover (91) is connected and arranged at one axial end of the first rear filter element (10) opposite to the second rear filter element (11), the second end cover (92) is connected and arranged between the first rear filter element (10) and the second rear filter element (11), and the third end cover (93) is connected and arranged at one axial end of the second rear filter element (11) opposite to the first rear filter element (10).

12. The staged filter element assembly as defined in claim 11, wherein:

the first rear filter element (10) is positioned above the second rear filter element (11), and the central axis of the first rear filter element (10) is overlapped with that of the second rear filter element (11) and extends along the vertical direction;

the first end cover (91), the second end cover (92) and the third end cover (93) are sequentially arranged at intervals from top to bottom;

the upper end of the first end cover (91) is a closed end, and raw water enters the first filter element (1) through the upper part of the first filter element (1);

the lower end of the third end cover (93) is an open end and is formed into a pure water outlet (8), the lower end of the second filter element (2) is provided with a second water sealing part (72), the second water sealing part (72) can seal water, and the concentrated water outlet (4) is formed between the second water sealing part (72) and the third end cover (93).

13. The staged filter element assembly of claim 11, wherein:

the first end cover (91), the second end cover (92) and the third end cover (93) are all injection-molded parts; the first rear filter element (10) and the second rear filter element (11) are made of microporous filter materials, and the aperture of each microporous filter material is 0.02-15 um.

14. The staged filter element assembly of claim 13, wherein:

the microporous filter material is activated carbon or ceramic.

15. The staged filter element assembly of claim 11, wherein:

one axial end of the first rear filter element (10) is bonded with the first end cover (91), and the other axial end of the first rear filter element (10) is bonded with the second end cover (92); one axial end of the second rear filter element (11) is bonded with the second end cover (92), and the other axial end of the second rear filter element (11) is bonded with the third end cover (93);

the outer diameter of the first rear filter element (10) is less than or equal to that of the first end cover (91), and the outer diameter of the first rear filter element (10) is less than or equal to that of the second end cover (92);

the outer diameter of the second rear filter element (11) is smaller than or equal to the outer diameter of the second end cover (92), and the outer diameter of the second rear filter element (11) is also smaller than or equal to the outer diameter of the third end cover (93).

16. A water purifying device is characterized in that: comprising the staged filter element assembly of any of claims 1-15.

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