CN114618200A - Stage type filter element assembly and water purifying device - Google Patents

Abstract

The invention provides a stage type filter element assembly and a water purifying device, wherein the stage type filter element assembly comprises: 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. The invention can realize stage type filter element filtration on the same central tube, improve the recovery rate and reduce the volume, and solve the problem of overlarge volume caused by the series connection of a plurality of filter elements.

Description

A staged filter element assembly and water purification device

technical field

The invention belongs to the technical field of water purification, and in particular relates to a stage-type filter element assembly and a water purification device.

Background technique

High water production rate is the development trend of water purifiers, and its realization methods mainly include adding chemical scale inhibitors, multiple filter elements in series to form stage filtration, etc. However, although the above two technologies can achieve high recovery rates, they have the following problems:

Question 1: Adding chemical scale inhibitors can achieve good scale inhibition effect and improve water purification rate, but there are health and safety problems caused by the release of scale inhibitor substances;

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

The high water production rate can be achieved without chemical scale inhibitors. The stage filter technology has a good application prospect, but the form of multiple filter elements in series leads to a large volume. If the stage filter function is realized on the same central pipe, then It can effectively exert the characteristics of stage filtration technology and solve the volume problem caused by multiple filter elements. However, a problem in front of us is that the same central tube realizes the stage-type filtration function, and the central tube is bound to be used in sections, which will reduce the effective flow channel length of the filter element and affect the service life of the filter element.

Since the conventional filter element assembly in the prior art has technical problems such as not being able to improve the recovery rate and reduce the volume at the same time, the present invention researches and designs a stage-type filter element assembly and a water purification device.

SUMMARY OF THE INVENTION

Therefore, the technical problem to be solved by the present invention is to overcome the defect that the conventional filter element assembly in the prior art cannot simultaneously improve the recovery rate and reduce the volume, thereby providing a staged filter element assembly and a water purification device.

The present invention provides a staged filter element assembly, which 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 at the same time, and the raw water can be filtered through the first filter element, The pure water filtered through the first filter element can enter the interior of the support member and be discharged along the support member, and the concentrated water filtered through the first filter element can reach the second filter element for filtration , the pure water filtered out through the second filter element can also enter the interior of the support member and be discharged along the support member, and the concentrated water filtered out through the second filter element can pass through the concentrated water outlet and be discharged ;

The filter bottle body and the filter bottle cover together form an inner cavity, and the first filter element, the second filter element and the support member are all arranged in the inner cavity.

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

The lower end of the filter bottle body is provided with a raw water inlet, the lower end of the support member forms a pure water outlet, and a concentrated water outlet is arranged between the lower end of the filter bottle body and the support member; A raw water inlet is provided, the lower end of the support member forms a pure water outlet, and a concentrated water outlet is arranged between the lower end of the filter bottle body and the support member.

In some embodiments, a first clearance flow channel capable of water supply is formed between the upper end of the first filter element and the filter bottle cap, and a water supply can be formed between the outer periphery of the first filter element and the filter bottle body. A second gap flow channel that circulates, a third gap flow channel for water circulation is formed between the outer circumference of the second filter element and the filter bottle body, and a third gap flow channel is formed between the lower end of the second filter element and the filter bottle body The fourth clearance flow channel that can circulate water.

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 member, and the first water sealing member can seal the second filter element. Part of the structure of the lower end of the filter element is sealed, and the first water sealing member is provided with an opening to form a first outlet, which can allow the concentrated water filtered by the second filter element to flow down through the first water sealing member to the The concentrated water is discharged and discharged; the outer peripheral position between the axial direction of the first filter element and the second filter element is provided with a second water sealing member to seal the raw water and the second water sealing member on the outer circumference of the second water sealing member. The concentrated water in the inner circumference is sealed;

In some embodiments, when the raw water inlet is provided on the filter bottle cap, the lower end of the second filter element is further provided with a first water sealing member, and the first water sealing member can seal the lower end of the second filter element. The part of the structure of the filter element is sealed, and the first water sealing member is provided with an opening to form a first outlet, which can allow the concentrated water filtered by the second filter element to flow down to the concentrated water outlet through the first outlet. A second water sealing member is also arranged between the outer periphery of the first filter element and the filter bottle body, so as to seal the raw water above the second water sealing member.

In some embodiments, the support member is a structure of a central tube, the central tube is a cylindrical tube with a hollow cavity, and the tube wall is provided with a guide hole penetrating the inner and outer walls, and the guide hole includes The first guide hole opposite to the position of the first filter element and the second guide hole opposite to the position of the second filter element, the pure water filtered through the first filter element can pass through the first guide hole. The flow hole enters the interior of the central pipe, and the pure water filtered by the second filter element can enter the interior of the central pipe through the second guide hole.

In some embodiments, the central tube includes a first shaft section, a second shaft section and a third shaft section in sequence along its axial direction, the first guide hole is formed on the first shaft section, and the first A second guide hole is formed on the three shaft segments, and no guide hole is formed on the second shaft segment. The first filter element is wound around the outer circumference of the first shaft segment, and the second filter element is wound around the first shaft. The periphery of the triaxial segment.

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

In some embodiments, the central pipe further includes a fourth shaft section and a fifth shaft section, the fifth shaft section is further provided with a third guide hole, and the stage-type filter element further includes a third filter element, The first filter element is wound around the outer circumference of the first shaft section, the concentrated water filtered by the second filter element can reach the third filter element for filtration, and the pure water filtered by the third filter element can also be filtered. The concentrated water can enter the interior of the central pipe and be discharged along the central pipe, and the concentrated water filtered by the third filter element can pass through the concentrated water outlet and be discharged.

In some embodiments, the support member includes an end cap assembly, a first rear filter element and a second rear filter element, the first rear filter element has a first hollow cavity inside, and the second rear filter element There is a second hollow cavity inside, the first rear filter element is opposite to the first filter element, and the pure water filtered by the first filter element can be further filtered through the first rear filter element and enter the In the first hollow cavity, the pure water filtered by the second filter element can be further filtered by the second rear filter element and then enter the second hollow cavity, and the first hollow cavity and the The second hollow cavity is communicated.

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 is connected to the second filter element. The filter elements are arranged at intervals.

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 the first rear filter element and is connected to the second end cap The opposite axial end of the rear filter element, the second end cover is connected and arranged between the first rear filter element and the second rear filter element, and the third end cover is connected and arranged on the second rear filter element. The axial end on the rear filter element and opposite to the first rear filter element.

In some embodiments, the first rear filter element is located above the second rear filter element, and the central axis of the first rear filter element and the second rear filter element overlap and extend in a vertical direction;

The first end cap, the second end cap and the third end cap are sequentially spaced from top to bottom;

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

The lower end of the third end cap is an open end, which is formed as a pure water outlet, the lower end of the second filter element is provided with a second water sealing member, the second water sealing member can seal the water, and the first The concentrated water outlet is formed between the two water sealing members and the third end cover.

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 all microporous The filter material is made, and the pore size of the microporous filter material is 0.02-15um.

In some embodiments, the microporous filter material includes at least one of activated carbon and ceramics.

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

The outer diameter of the first rear filter element is smaller than or equal to the outer diameter of the first end cover, and the outer diameter of the first rear filter element is also smaller than or equal to the outer diameter of the second end cover;

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

The present invention also provides a water purification device, which includes the staged filter element assembly described in any one of the preceding items.

A staged filter element assembly and a water purification device provided by the present invention have the following beneficial effects:

1. The present invention sets the first and second filter elements on the same support member, the pure water filtered by the first filter element is discharged from the pure water outlet, and the filtered concentrated water (impurity water) enters the second filter element for filtration, forming at least one filter element. One-stage two-stage filtration, compared with multiple fine filter elements connected in series, can effectively realize stage-type filtration technology, which can realize the filtration function of stage-type filter elements on the same central pipe, and can improve the recycling rate of waste water. , because each existing filter element needs a membrane shell, so the series filter element needs multiple membrane shells, the present invention can effectively save the volume of the membrane shell and the like, and finally can reduce the volume while improving the recovery rate, Effectively solve the problem of volume control of the whole machine caused by the series connection of multiple filter elements; the stage-type filter element filtration technology is realized on the same central pipe, eliminating the need for the use of multiple filter bottles in series with the filter elements, and realizing the integrated design of the filter elements, which reduces the cost of filter elements and filters. The volume of the whole machine plays an important role in promoting; compared with the use of scale inhibitors to achieve high recovery filter technology (through one-stage two-stage (at least two-stage), no need to use scale inhibitors), the stage-type filter technology does not require There are hygienic and safety problems caused by the release of anti-scaling substances.

2. The present invention realizes the stage-type filter element filtration technology on the same central tube, saves the use of multiple filter bottles in series with the filter element, can realize the integrated design of the filter element, and has an important promoting effect on reducing the volume of the filter element and the whole machine; In the present invention, the support member includes an end cap assembly and two rear filter elements, so that the fine filter element can play a stage-type filtration function to improve the water purification and water production rate, and at the same time, it can also be integrated with the rear filter element. The integration of the filter element is improved and the number of filter bottles used is reduced, which is beneficial to the small-volume design function of the whole machine; the integration of the fine filter element and the rear-mounted taste filter element is conducive to the small-volume design of the whole machine.

3. The present invention achieves the stage-type filtering function on the same central tube without reducing the effective flow channel length of the filter element through the structure-oriented design, so that high water production rate can be achieved and the service life of the filter element can be effectively guaranteed.

Description of drawings

1 is a schematic structural diagram of Embodiment 1 of a staged filter element assembly of the present invention;

Fig. 2 is the structural representation of the stage type filter element assembly embodiment 2 of the present invention;

Fig. 3 is the structure diagram of the stage filter element of the present invention when the glue line is unfolded;

Fig. 4 is the mold modification structure diagram of the stage filter element of the present invention;

Fig. 5 is the structure diagram of the gluing mode of the one-stage three-stage filter element of the present invention;

Fig. 6 is the structural schematic diagram of the one-stage three-section filter element of the present invention after mold repair;

Fig. 7 is the structural schematic diagram of the present invention's central pipe (pure injection molded part) and filter element;

Fig. 8 is the structural representation of the center pipe (injection molding + filter material combination) and filter element of the present invention;

FIG. 9 is a schematic structural diagram of the central pipe (pure injection molded part) of the one-stage two-stage filter element of the present invention.

The reference numbers in the figure are indicated as:

1. The first filter element; 2. The second filter element; 3. The raw water inlet; 3a, the raw water inlet hole of the central pipe; 4. The concentrated water outlet; 5. The central pipe; 51, the first shaft section; 52, the second shaft section; 53, the third shaft segment; 54, the fourth shaft segment; 55, the fifth shaft segment; 61, the first guide hole; 62, the second guide hole; 63, the third guide hole; 71, the first seal Water fitting; 71a, first outlet; 72, second water sealing member; 73, first glue line; 74, second glue line; 8, pure water outlet; 9, end cap assembly; 91, first end cap; 92, the second end cap; 93, the third end cap; 10, the first rear filter element; 11, the second rear filter element; 12, the filter bottle body; 13, the filter bottle cap; 14, the water inlet screen; 15a , blade one; 15b, blade two; 15c, blade three; 15d, blade four; 16a, point one; 16b, point two; 16c, point three; 16d, point four; 17, gap; 101, first gap runner ; 102, the second gap runner; 103, the third gap runner; 104, the fourth gap runner.

Detailed ways

As shown in Figures 1-9, the present invention provides a staged filter element assembly, which includes:

The first filter element 1, the second filter element 2, the support member, the filter bottle body 12 and the filter bottle cap 13, the support member can support the first filter element 1 and the second filter element 2 at the same time, and the raw water can pass through all the The first filter element 1 is filtered, and 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, and the concentrated water filtered through the first filter element 1 can After reaching 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, and filter through the second filter element 2 The concentrated water can pass through the concentrated water outlet 4 and be discharged;

The filter bottle body 12 and the filter bottle cap 13 together form 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 The upper end of the first filter element 1 is not provided with a water sealing member.

In order to solve the problems of the scale inhibitor, the stage-type filter element technology in which multiple filter elements are connected in series, and the problems existing in a single filter element in order to achieve high water production rate, the present invention provides a stage-type filter roll type membrane filter element structure with a shared central pipe. The concentrated water of the first-stage filter element is used as the raw water of the next-stage filter element, so as to achieve the purpose of high water production rate, and avoid the chemical release problem that may exist in chemical antiscalants, the volume problem caused by the series connection of multiple filter elements, and the purity of a single filter element. To achieve the problem of filter fouling caused by high water production rate.

In the present invention, the first and second filter elements are arranged on the same support member, the pure water filtered by the first filter element is discharged from the pure water outlet, and the filtered concentrated water (impurity water) enters the second filter element for filtration to form at least one stage Two-stage filtration, compared with multiple fine filter elements connected in series, can effectively realize stage-type filtration technology, which can realize the filtration function of stage-type filter elements on the same central pipe, and can improve the recycling rate of wastewater. Each existing filter element needs one membrane shell, so the series filter element needs multiple membrane shells. The present invention can effectively save the volume of membrane shells, etc., and finally can reduce the volume while improving the recovery rate, effectively solving the problem. The volume control problem of the whole machine caused by the series connection of multiple filter elements; the stage-type filter element filtration technology is realized on the same central pipe, which eliminates the need for the use of multiple filter bottles in series with the filter element, and can realize the integrated design of the filter element. Compared with the use of scale inhibitors to achieve high recovery filter technology (through one-stage two-stage (at least two-stage), no need to use scale inhibitors), the stage filter technology has no resistance Hygiene and safety issues caused by the release of fouling substances.

The present invention: 1) The first-stage two-stage filter element filtration technology is realized on the same central tube, which reduces the use of multiple filter bottles that use the first-stage two-stage filter technology with two filter elements in series, realizes the integrated design of the filter element, and reduces the impact on the filter element. And the volume of the whole machine has an important role in promoting;

2) Compared with the use of scale inhibitors to achieve high recovery filter technology, the stage filter technology does not have the health and safety problems caused by the release of scale inhibitors;

3) Compared with a single filter element, which can achieve high water production rate purely by improving the recovery rate, it can achieve high water production rate by controlling the relationship between flow rate and recovery rate, which can effectively prolong the service life of the filter element;

4) The stage-type filter element technology, compared with the single-stage filter element technology, can improve the water purification rate of the filter element.

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

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 arranged between the lower end of the filter bottle body 12 and the support member; 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. These are two different structural forms of the present invention, that is, Example 1, as shown in Figure 1, the raw water enters the water from the lower end of the filter bottle body at the lower end, and then enters the first filter element after reaching the upper end, and then flows downward in turn and comes over, and the concentrated Both the water outlet and the pure water outlet are located at the lower end, and 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; The filter cap at the upper end enters the water, flows downward and comes over in turn, the concentrated water outlet and the pure water outlet are located at the lower end, and finally the filtered pure water (without impurities) and concentrated water (with impurities) pass through the pure water outlet respectively. And the concentrated water outlet is discharged.

The invention provides an integrated roll-type membrane filter element with a stage-type filtering function and its structure. According to its structural features, the stage-type functions that can be realized are not limited to one-stage two-stage, but also one-stage three-stage, There are even more sections, so the specific filter element structure can be selected according to the required water purification rate. In the present invention, the structure and manufacturing method of the filter element for realizing one-stage and two-stage functions in the same central tube are mainly described, and the details are as follows:

The stage-type filter element in the present invention focuses on the field of roll-type membrane filter elements, and the roll-type membrane includes nanofiltration, reverse osmosis, and the like. Nanofiltration and reverse osmosis filter elements generally include three nozzles, raw water inlet, concentrated water outlet and pure water outlet. According to the arrangement of the nozzles, there are two forms: 1. The three nozzles are distributed at the same end; 2. The concentrated water outlet One end of the pure water outlet is arranged, and the raw water inlet is arranged at one end alone. The following is the realization of the first-stage and two-stage filtration function based on the same central pipe, and the specific description is given according to the position of the nozzle.

In some embodiments, a first clearance flow channel 101 capable of circulating water is formed between the upper end of the first filter element 1 and the filter bottle cap 13 , and the outer circumference of the first filter element 1 is connected to the filter bottle body 12 . A second gap flow channel 102 for water circulation is formed therebetween, and a third gap flow channel 103 for water flow is formed between the outer periphery of the second filter element 2 and the filter bottle body 12 . A fourth clearance flow channel 104 capable of circulating water is formed between the lower end and the filter bottle body 12 . The present invention passes 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 at the lower end of the second filter element The flow channel can make the raw water as shown in the embodiment enter the upper end of the first filter element through the fourth gap flow channel, the third gap flow channel, the second gap flow channel and the first gap flow channel in sequence, and enter the first filter element. In the filter element, this is the preferred structural form of Embodiment 1 of the present invention.

In some embodiments, when the lower end of the filter bottle body 12 is provided with the raw water inlet 3 , the lower end of the second filter element 2 is further provided with a first water sealing member 71 , and the first water sealing member 71 can Part of the structure of the lower end of the second filter element 2 is sealed, and the first water sealing member 71 is provided with an opening to form a first outlet 71a, which can allow the concentrated water filtered by the second filter element 2 to pass through the The first water sealing member 71 flows down to the concentrated water outlet 4 and is discharged; a second water sealing member 72 is provided at the outer peripheral position between the axial direction of the first filter element 1 and the second filter element 2 to prevent The raw water at the outer circumference of the second water sealing member 72 is sealed with the concentrated water at the inner circumference of the second water sealing member 72;

When the raw water inlet 3 is provided on the filter cap 13 , the lower end of the second filter element 2 is also provided with a first water sealing member 71 , and the first water sealing member 71 can seal the lower end of the second filter element 2 . The first water sealing member 71 is provided with an opening to form a first outlet 71a, which can allow the concentrated water filtered by the second filter element 2 to flow down through the first outlet 71a to the A second water sealing member 72 is also arranged between the outer periphery of the first filter element 1 and the filter bottle body 12 to seal the raw water above the second water sealing member 72 .

In Embodiment 1 of the present invention, the first water sealing member at the lower end of the second filter element can separate the raw water at the lower end of the second filter element from the concentrated water filtered by the second filter element, and the outer periphery of the spaced position between the first and second filter element can be separated. Setting the second water sealing member can effectively separate the concentrated water in the inner circumference and the raw water in the outer circumference. The raw water in Example 1 of the present invention enters between the second filter element and the filter bottle body from below, and reaches the first At the filter element, it can enter the first filter element in the radial direction for filtration, or it can enter the first filter element from the top of the first filter element for filtration. The filtered pure water enters the interior of the central pipe from the first guide hole to remove , the filtered pure water enters the second filter element downward along the axial direction for filtration.

In Embodiment 2 of the present invention, the first water sealing member at the lower end of the second filter element can separate the raw water at the lower end of the second filter element and the concentrated water filtered by the second filter element, and the first filter element and the filter bottle body are arranged between the first filter element and the filter bottle body. The second water sealing member can effectively separate the concentrated water in the inner circumference and the raw water in the outer circumference, and also prevent the raw water from falling down from the gap between the first filter element and the filter bottle body and cannot be effectively filtered. Action, the filtered pure water enters the interior of the central pipe from the first guide hole to be discharged, and the filtered pure water enters the second filter element downward along the axial direction for filtration.

1. The nozzles are distributed at the same end. Figure 1 is a schematic structural diagram of an integrated roll-type membrane filter element with a one-stage two-stage filtration function arranged at the same end of the nozzle. The raw water enters the filter bottle from the raw water inlet, reaches the end of the first filter element 1 through the periphery of the second filter element 2, and then enters the interior of the first filter element 1 for filtration. 61) Collected into the central pipe, the concentrated water enters the end face of the second filter element 2 and the first filter element 1 opposite, and is used as the raw water of the second filter element 2 to be filtered and purified again, thereby realizing the improvement of the purified water production rate, and the pure water is The pure water is collected and merged with the pure water of the first filter element 1 through the pure water diversion port (second diversion hole 62 ) on the central pipe, and then flows out from the pure water outlet, and the concentrated water is discharged from the concentrated water outlet. The above-mentioned first filter element 1 and second filter element 2 are formed of the same membrane sheet by gluing and trimming, so as to simultaneously form a non-separate filter element, which will be mentioned in the subsequent sections.

In order to realize the above water channel function, a water sealing member (the first water sealing member 71 ) and a water sealing member (the second water sealing member 72 ) are also included. The first water sealing member 71 mainly separates the concentrated water of the second filter element 2 from the raw water of the first filter element 1. The inner cavity of the first water sealing member 71 covers the end of the second filter element 2, and the outer periphery of the first water sealing member 71 is connected to the second filter element 2. 2. The outer circumference is fixed and sealed by wrapping the tape; the second water sealing member 72 is mainly to separate the concentrated water and the raw water of the first filter element 1, so as to realize that the water flow is not mixed with each other, which is formed after the first filter element 1 and the second filter element 2 are repaired. In the space between the first filter element 1 and the second filter element 2, the water sealing member has a T-shaped feature, and the T-shaped part enters the space, and at the same time, the two ends are framed on the outer circumference of the first filter element 1 and the second filter element 2, and finally sealed by the tape and the two-part filter element.

2. The heresy distribution of the nozzle. FIG. 2 is a schematic structural diagram of an integrated roll-type membrane filter element with a one-stage two-stage filtration function arranged heretically at the nozzle. The raw water enters the filter bottle from the raw water inlet, and enters the end face of the first filter element 1 through the raw water inlet hole on the central pipe for filtration. It flows into the gap formed after the film repair, and enters the end face of the second filter element 2 under the pressure drive, and is used as the raw water of the filter element to be filtered and purified again. After the pure water of the first filter element 1 is combined, it flows out through the pure water outlet, and the concentrated water flows out from the concentrated water outlet.

In order to realize the above water channel function, the integrated filter element with heterotopic distribution of nozzles further includes a water sealing member (the first water sealing member 71 ) and a water sealing member (the second water sealing member 72 ). Among them, the position of the first water sealing member 71 distributed at the same end of the nozzle, the fixing method and structure of the second filter element 2 are the same, and the difference is in the function. The raw water and the concentrated water produced by the second filter element 2 are separated; the second water sealing member 72 is located on the side of the first filter element 1 away from the second filter element 2, its overall shape is Y-shaped, and the big end is close to the end face of the first filter element 1 , the small end inserts the first filter element 1 into it to achieve a tight fit, and at the same time achieves sealing through the tape and the outer peripheral surface of the first filter element 1, which is used to separate the raw water of the first filter element 1 and the produced concentrated water.

The difference between the two types of filter elements of the first-stage and two-stage nozzles mentioned above lies in the water path and sealing after being assembled into the filter bottle; The following is a description of the production of the basic filter element, including the setting of the glue line and the film repair, as follows:

Glue line settings. In this technical solution, in order to realize the stage-type filter element technology by gluing and repairing the membrane on the same central tube, Fig. 3 shows the specific gluing method. After placing the membrane sheet in the way mentioned in the membrane unit, glue the first membrane sheet as shown in Figure 2. Because the technical solution is a stage-type filter element technology, which is an integrated design of the filter element, the first and second-level filter elements are referred to as filter element one and filter element two respectively. As can be seen from Figure 2, the glue lines of the first filter element 1 and the second filter element 2 are glued on the other three sides except that the membrane is not glued near the central tube; the first filter element 1 and the second filter element 2 are two A separate and complete glue line, which is perpendicular to the glue line of the central tube, does not overlap with the outer edge of the diaphragm, and needs to leave a certain distance for curling the filter element and repairing the film after the glue is cured, so as to ensure the tightness of the filter element; each The width of the glue line of the filter element needs to be larger than the width of the corresponding water guide port of the filter element, so as to prevent the glue from blocking the water guide port and affecting the water production; the adjacent glue line between the first filter element 1 and the second filter element 2 needs to leave a distance d1, The distance of d1 is reserved for the membrane to be repaired after the filter element is cured to form a staged filter element (see the description of repairing membrane); the glue line of the second filter element 2 is close to the pure water outlet; Glue according to the gluing method shown in Figure 3. After the last membrane sheet is placed, gluing and then rewinding, so that the filter element is rolled into a cylindrical shape, and the membrane trimming operation is carried out after the glue is cured.

Repair the film. In this technical solution, in order to realize the stage-type filter element technology by means of glue line setting and membrane trimming on the same central tube, the specific membrane trimming method is shown in FIG. 4 . After the filter element is cured, use the corresponding film repairing blade to repair the film. In order to realize the film repairing, the technical solution is described in a 4-blade film repairing method. Take a central tube of an unrolled filter element, adjust the position of the blade according to the position of blade 1 corresponding to point 1, blade 2 corresponding to point 2, etc., and then start the membrane repairing equipment (no specific instructions) to remove the membrane that needs to be removed. The first filter element 1 and the second filter element 2 have a gap between the first filter element 1 and the second filter element 2 after removing the trimmed part to obtain the sample form after trimming, which acts as 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 to realize One-stage two-stage filtration.

By adopting this technical solution, a trimmed filter element is obtained, and there are different treatment methods for the gap between the first filter element 1 and the second filter element 2, which are described in the filter elements of the two types of nozzles.

The above is a description of the method of gluing and repairing the filter element of the one-stage two-stage filter element filtration technology on the same central tube. , performance and other advantages.

In addition, following the filter element structure of this technical solution, it can also realize the function of one-stage three-stage filtration. The specific gluing process and the state of the filter element after membrane repair are shown in Figures 5 and 6, which will not be described in detail here.

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

This is the first preferred structural form of the support member of the present invention. As shown in FIG. 6, the present invention preferably sets the support member as the structure of the central tube (the whole is an injection molded part), which can effectively protect the first and second filter elements. Under the action of the support, the pure water filtered by the first filter element can also be effectively introduced into the inner cavity of the central pipe through the first guide hole opened on it, and the pure water can be led out. The pure water filtered by the second filter element is introduced into the inner cavity of the central pipe and exported, while the impurity water (concentrated water) filtered by the first filter element enters the second filter element for filtration, which can effectively improve the filtration effect of concentrated water and improve waste water. The recovery rate is increased, the water production is increased, and the volume is reduced, making the structure more compact.

The raw water enters from the end face of the first filter element 1 close to the end of the central pipe, the pure water is collected into the central pipe through the guide hole, and the concentrated water is used as the raw water of the second filter element 2 to enter from the concentrated water end of the first filter element 1, and the pure water passes through the guide. After being collected by the orifice, the pure water of the first filter element 1 is combined with the pure water and discharged from the pure water port, and the concentrated water is discharged from the end face.

In some embodiments, the central tube 5 includes a first shaft section 51 , a second shaft section 52 and a third shaft section 53 in sequence along its axial direction, and the first flow guide is provided on the first shaft section 51 Hole 61, the third shaft segment 53 is provided with a second guide hole 62, the second shaft segment 52 is not provided with a guide hole, the first filter element 1 is wound around the outer periphery of the first shaft segment 51 , the second filter element 2 is wound around the outer circumference of the third shaft segment 53 . The central pipe of the invention is preferably arranged as the first, second and third shaft sections along the axial direction, the first shaft section is provided with a first guide hole, and the first filter element is wound around the outer circumference of the first shaft section, so that the first The pure water filtered by the filter element is introduced into the inner cavity of the central pipe through the first guide hole, the third shaft section is provided with a second guide hole, and the second filter element is wound around the outer circumference of the third shaft section, which can filter the second filter element The outgoing pure water is introduced into the inner cavity of the central pipe through the second guide hole. As shown in Figure 9, to achieve one stage and two sections on the same central tube, a distance D2 needs to be reserved between D1 and D3 (D1 refers to the axial length of the first filter element, and D3 refers to the axial length of the second filter element. , D2 is the axial length of the interval between the two filter elements), the purpose is to form a two-part filter element when the film is repaired, wherein the starting surface of the upper end of D2 is the end surface of the first filter element close to the second filter element, and the end surface is the first filter element. The second-stage filter element is close to the end face of the first-stage filter element. The one-stage two-section central pipe of the present invention can integrate the traditional one-stage two-section technology of multiple filter elements in series on the same central pipe, so as to achieve high water production rate and reduce the use of the number of filter bottles. However, its filtration function is only the purification function of the fine filter element, which is a single-stage purification.

In some embodiments, the central pipe 5 is an injection molded part; the central axis of the central pipe 5 is arranged along the vertical direction, the first filter element 1 is located above the second filter element 2, and the first filter element 1 is located above the second filter element 2. A 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 the raw water enters the Described in the first filter element 1.

The central tube of the present invention is preferably an integral injection molded part (more preferably an integral plastic integral injection molding), which can effectively support the inner circumference of the filter element and also play the role of guiding pure water; it is arranged along the vertical direction of the central axis. The central tube of the duct forms the first, second and third shaft sections from top to bottom. The first and second filter elements 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, the raw water enters the first filter element for filtration, and the filtered pure water enters the interior of the central pipe through the first guide hole.

As shown in FIGS. 5-6 , in some embodiments, the central tube 5 further includes a fourth shaft section 54 and a fifth shaft section 55 , and the fifth shaft section 55 is further provided with a third guide hole 63 , the segmented filter element also includes a third filter element, the first filter element 1 is wound around the outer periphery of the first shaft segment 51, and the concentrated water filtered by the second filter element 2 can reach the third filter element The pure water filtered by the third filter element can also enter the interior of the central pipe and be discharged along the central pipe, and the concentrated water filtered by the third filter element can pass through the concentrated water. The water exits 4 and is drained. This is the preferred structural form of Embodiment 3 of the present invention, as shown in FIG. 6 , that is, it is provided with five shaft segments in the axial direction, and there are three parts of guide holes at the beginning, which can realize one-stage and multi-stage purification and filtration In order to meet the requirements of the stage-type filter element, the position of the pure water diversion hole can be opened, and the first-stage multi-stage purification function can also be realized.

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 , and the interior of the first rear filter element 10 has a first hollow cavity , 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, and the pure water filtered by the first filter element 1 can pass through the The first rear filter element 10 is further filtered and enters the first hollow cavity, and the pure water filtered by the second filter element 2 can be further filtered through the second rear filter element 11 and enter the second In the hollow cavity, 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 rear filter elements, so as to ensure that the fine filter filter element exerts the stage-type filtering function to improve the water purification rate. At the same time, it can also realize the integration with the rear-mounted taste filter element to improve the integration 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 staged filter element assembly of the present invention has the function of one-stage two-stage purification, improves the water production rate, and can be closely fitted with the rear filter element to realize the two-stage purification function on one filter element assembly. Its structure is basically the same as that of the central tube filter element of pure injection-molded parts. The difference lies in the combination of injection-molded parts and microporous filter material in the central tube. In-situ purification of water to achieve a two-in-one filter element structure.

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 , and the first filter element 1 The first water sealing member 71 is arranged at an interval with the second filter element 2 , and the first water sealing member 71 is arranged at the spaced position, and the first water sealing member 71 is opposite to the second end cover 92 . The first filter element is wound around the outer periphery of the first rear filter element, which can transport the pure water filtered by the first filter element inward to the first rear filter element for further filtration and purification, and the second filter element is wound around the second rear filter element. On the outer circumference of the filter element, the pure water filtered by the second filter element can be transported radially inward to the second rear filter element for further filtration and purification; Separate and seal between them to prevent the two from mixing.

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 , and the first end cap 91 is connected to the first rear filter element 10 . And at the axial end 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. The three-end cover 93 is connected to the axial end of the second rear filter element 11 and opposite to the first rear filter element 10 . This is the 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 rear filter element, and the second end cap is used to support the other end of the first rear filter element The second end cover can also support and fix one end of the second rear filter element, and the third end cover can support and fix the other end of the second rear filter element.

The support member shown in Figure 8 is composed of injection molded parts and filter media, which can realize the purpose of high water production in one stage and two stages of the fine filter element, and can be combined with the rear filter element of the fine filter element in situ to form a two-stage filtration function. stage filter. The specific composition includes a first end cover 91 , a second end cover 92 and a third end cover 93 , as well as a first rear filter element 10 and a second rear filter element 11 .

The outer diameter and effective inner diameter of the three end caps are the same, the purpose is to facilitate the production of the initial filter element; the first end cap 91 is sealed at one end, the purpose is to realize the separation of the water path; the two ends of the second end cap 92 are connected, the purpose In order to realize the conduction of the water channel; the third end cover 93 is also connected at both ends to discharge the collected pure water, and at the same time, the outer surface of the third end cap 93 near the water outlet has a sealing groove feature, which is used to realize the separation of the water channel.

In some embodiments, the first rear filter element 10 is located above the second rear filter element 11 , and the central axes of the first rear filter element 10 and the second rear filter element 11 are coincident and vertically aligned. extend straight;

The first end cap 91 , the second end cap 92 and the third end cap 93 are sequentially spaced from top to bottom;

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

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

This is a further preferred structural form of the support member of the injection molded part + filter material combination of the present invention, that is, the first and second rear filter elements arranged in the vertical direction can make the raw water flow into the first filter element from top to bottom for filtering, and then The concentrated water in the first filter element is transported to the second filter element for filtration to form a one-stage two-stage filtering structure. The pure water opening formed under the third end cover can effectively export the pure water filtered by the rear filter element, and the concentrated water can be extracted. The water outlet is used to export the impurity water filtered by the second filter element.

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 all made of microporous filter material, and the pore size of the microporous filter material is 0.02-15um. The three end caps of the present invention are all made of injection molded parts, which can effectively play the role of support and fixation. The first and second rear filter elements are made of microporous filter materials. The effect of further fine filtration of water can improve the taste of water, etc., and improve the filtration accuracy.

In some embodiments, the microporous filter material includes at least one of activated carbon and ceramics. Compared with the visible hole of the injection molded part, it can realize the surface contact between the water produced by the fine filter element and the rear filter element, and the purification effect is better. The length ratio of the first rear filter element 10 and the second rear filter element 11 is preferably between 1 and 2.5.

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

The outer diameter of the first rear filter element 10 is smaller 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 smaller 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 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 .

The first rear filter element and the two end caps of the present invention are preferably fixed by bonding. The first rear filter element 10 is cylindrical, and its outer diameter is ≤ the first end cap 91 and the second end cap 92 The outer diameter of the first rear filter element 10 and the two end caps are fixed on the matching end faces by glue bonding;

The second rear filter element 11 is cylindrical, its outer diameter is less than or equal to the outer diameter of the second end cap 92 and the third end cap 93, and its inner diameter is equal to the effective inner diameter and outer wall of the two end caps, so as to achieve fit, and the second The connection between the rear filter element 11 and the two end caps is fixed on the matched end faces through glue bonding.

The present invention also provides a water purification device, which includes the staged filter element assembly described in any one of the preceding items.

The invention provides an integrated roll-type membrane filter element with a stage-type filtering function. Compared with the traditional multi-piece filter element in series to realize the stage-type function, it can be realized by sharing a central pipe, and has a promoting effect on reducing the volume of the filter element. , and has the characteristics of high water production rate of the stage-type filter element filtration technology; at the same time, combined with the characteristics of the filter element provided by this technical solution, the stage-type functions that can be realized are not limited to one-stage and two-stage, including one-stage multi-stage function (≥ 2 stages). ), so the water purification rate has an adjustable feature.

In the present invention, the support member includes an end cap assembly and two rear filter elements, so that the fine filter element can play a stage-type filtration function to improve the water purification and water production rate, and at the same time, it can also be integrated with the rear filter element. The integration of the filter element is improved and the number of filter bottles used is reduced, which is beneficial to the small-volume design function of the whole machine; the integration of the fine filter element and the rear-mounted taste filter element is conducive to the small-volume design of the whole machine.

According to the design of the structure, the invention realizes the stage-type filtering function on the same central pipe without reducing the effective flow channel length of the filter element, so that high water production rate can be achieved and the service life of the filter element can be effectively guaranteed; The sealing structure and the clearance channel provided at the axial end and the radial end of the filter element and the second filter element form a compact flow channel structure and improve the filtering efficiency. The invention provides an integrated roll-type membrane filter element with a stage-type filtering function. Compared with the traditional multi-piece filter element in series to realize the stage-type function, it can be realized by sharing a central pipe, and has a promoting effect on reducing the volume of the filter element. , and has the characteristics of high water production rate of the stage-type filter element filtration technology; at the same time, combined with the characteristics of the filter element provided by this technical solution, the stage-type functions that can be realized are not limited to one-stage and two-stage, including one-stage multi-stage function (≥ 2 stages). ), so the water purification rate has an adjustable feature.

The above descriptions are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included in the protection of the present invention. within the range. The above are only the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, without departing from the technical principles of the present invention, several improvements and modifications can also be made. These improvements and modifications It 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 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) with filter flask lid (13) enclose into inside cavity jointly, first filter core (1), second filter core (2) with the supporting member all set up in the inside cavity.

2. The staged filter element assembly of 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), an opening is formed in the first water sealing part (71) to form a first outlet (71a), 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), an opening is arranged on the first water sealing part (71) to form a first outlet (71a), 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 (71a) 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 element 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:

the central tube (5) sequentially comprises a first shaft section (51), a second shaft section (52) and a third shaft section (53) along the axial direction of the central tube, the first shaft section (51) is provided with a first diversion hole (61), the third shaft section (53) is provided with a second diversion hole (62), the second shaft section (52) is not provided with a diversion hole, the first filter element (1) is wound on the periphery of the first shaft section (51), and the second filter element (2) is wound on the periphery of the third shaft section (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 shaft part (51) second shaft part (52) with third shaft part (53) is 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 1-8, 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 of 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 of 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 on the first rear filter element (10) and at one axial end 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 on the second rear filter element (11) and at one axial end opposite to the first rear filter element (10).

12. The staged filter element assembly of 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 extreme of third end cover (93) is the open end, forms into pure water outlet (8), the lower extreme of second filter core (2) is provided with second water sealing (72), second water sealing (72) can seal water, just form between second water sealing (72) and third end cover (93) dense water export (4).

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; first rearmounted filter core (10) with second rearmounted filter core (11) all adopt the micropore filter media to make, the aperture of micropore filter media is 0.02 ~ 15 um.

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

the microporous filter includes at least one of activated carbon and 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 that of the second end cover (92), and the outer diameter of the second rear filter element (11) is smaller than or equal to that 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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