Filter element and water purifying device

Abstract

The utility model discloses a filter element and a water purifying device, and relates to the technical field of water treatment.The filter element comprises a first filter unit, one of a water inlet part and a water outlet part of the first filter unit is located on the inner side wall of the first filter unit, and the other one of the water inlet part and the water outlet part of the first filter unit is located on the outer side wall of the first filter unit; the second filter unit comprises a basic membrane capable of being wound into the second filter unit, the basic membrane is provided with a first short side and a second short side which are opposite to each other and a first long side and a second long side which are opposite to each other in an unfolded state, and the first short side is the side, starting to be wound, of the second filter unit; the basic diaphragm is provided with a first surface and a second surface which are opposite; the two first surfaces or the two second surfaces of the adjacent basic diaphragms are opposite to each other at intervals; and the like. The filter element can solve the problems of easy blockage and low water passing amount caused by low pollutant holding amount of the existing filter element.

Description

Technical Field

[0001] The utility model relates to the technical field of water treatment, in particular to a filter element and a water purification device. Background Art

[0002] At present, the filter material used in the pre-filter element is mainly non-woven fabric, such as winding the non-woven fabric to form a cylindrical structure with an inner wall and an outer wall. When the pre-filter element filters water, the water passes through the non-woven fabric in the radial direction, and the non-woven fabric intercepts the particles and colloids in the water. Due to the uneven pressure distribution during filtration, the interception pressure is mainly concentrated on the first few layers of non-woven fabric that the water passes through. These layers of non-woven fabric are easier to get dirty, and the stacking of non-woven fabrics will aggravate the blockage. After these layers of non-woven fabric are blocked, the non-woven fabrics in the downstream layers will not only fail to absorb dirt, but also greatly reduce the water flow rate of the entire filter element. Utility Model Content

[0003] In order to overcome the above-mentioned defects of the prior art, the technical problem to be solved by the embodiments of the utility model is to provide a filter element and a water purification device, which can solve the problem that the existing filter element has a low dirt holding capacity, resulting in easy clogging and low water flow.

[0004] The specific technical solution of the embodiment of the utility model is:

[0005] A filter element, comprising:

[0006] a first filter unit, wherein one of a water inlet and a water outlet of the first filter unit is located on an inner side wall of the first filter unit, and the other of the water inlet and the water outlet of the first filter unit is located on an outer side wall of the first filter unit;

[0007] A second filter unit, the second filter unit comprises a basic membrane sheet that can be rolled into the second filter unit, the basic membrane sheet having opposite first short sides and second short sides, opposite first long sides and second long sides in an unfolded state, the first short side being the side at which the second filter unit starts to be rolled; the basic membrane sheet having opposite first and second sides; two first sides or two second sides of adjacent basic membrane sheets being spaced and opposite to each other; the two adjacent basic membrane sheets with opposite second sides forming a clean water outlet at at least one of the first short side, the second short side, the first long side and the second long side; the two adjacent basic membrane sheets with opposite first sides forming a raw water inlet at at least one of the first short side, the second short side, the first long side and the second long side, the clean water outlet and the raw water inlet being located on different sides of the basic membrane sheet; when the second filter unit is filtering, water enters from the raw water inlet, completely passes through the basic membrane sheet from the first side to the second side, and then flows out from the clean water outlet;

[0008] The first filter unit and the second filter unit are nested.

[0009] Preferably, the second filter unit is sleeved outside the first filter unit; the water inlet of the first filter unit is located on the outer wall of the first filter unit, and the water outlet of the first filter unit is located on the inner wall of the first filter unit; the clean water outlet of the second filter unit is located on the inner wall of the second filter unit, and the clean water outlet of the second filter unit is connected to the water inlet of the first filter unit.

[0010] Preferably, the second filter unit is sleeved outside the first filter unit; the water inlet of the first filter unit is located on the inner side wall of the first filter unit, and the water outlet of the first filter unit is located on the outer side wall of the first filter unit; the raw water inlet of the second filter unit is located on the inner side wall of the second filter unit, and the raw water inlet of the second filter unit is connected to the water outlet of the first filter unit;

[0011] or,

[0012] The first filter unit is sleeved outside the second filter unit; the water inlet of the first filter unit is located on the outer wall of the first filter unit, and the water outlet of the first filter unit is located on the inner wall of the first filter unit; the raw water inlet of the second filter unit is located on the outer wall of the second filter unit, and the water outlet of the first filter unit is connected to the raw water inlet of the second filter unit;

[0013] or,

[0014] The first filter unit is sleeved outside the second filter unit; the water inlet of the first filter unit is located on the inner wall of the first filter unit, and the water outlet of the first filter unit is located on the outer wall of the first filter unit; the clean water outlet of the second filter unit is located on the outer wall of the second filter unit, and the water inlet of the first filter unit is connected to the clean water outlet of the second filter unit.

[0015] Preferably, the first filter unit comprises a first filter layer, and the first filter layer is made of non-woven fabric.

[0016] Preferably, the first filter unit further includes a first supporting drainage layer; the first supporting drainage layer and the first filter layer are stacked and then rolled to form the first filter unit in a cylindrical shape; the first supporting drainage layer is located between two adjacent circles of the first filter layer, so that the two adjacent circles of the first filter layer are spaced apart and connected.

[0017] Preferably, the first filter unit further comprises a second filter layer, and the second filter layer is made of carbon fiber;

[0018] The first filter layer and the second filter layer are stacked and then rolled to form the first filter unit in a cylindrical shape.

[0019] Preferably, the first filter unit further includes a second filter layer and a first supporting drainage layer; the second filter layer is made of carbon fiber; the first filter layer and the second filter layer and the first supporting drainage layer arranged in parallel are stacked and then rolled to form the first filter unit in a cylindrical shape.

[0020] Preferably, when the water inlet of the first filter unit is located at the outer wall of the first filter unit, the first filter layer is stacked with the second filter layer and the first supporting drainage layer arranged in parallel and then starts to wind from one side of the first filter layer, and at least a portion of the second filter layer is closer to the side of the first filter unit where the winding starts than the first supporting drainage layer.

[0021] Preferably, the first supporting and draining layer comprises at least one of the following: a grid, or a sheet material having a preset thickness and a mesh structure on the surface.

[0022] Preferably, the upper end and the lower end of the first filter unit are in a sealed state.

[0023] Preferably, two adjacent base membranes facing each other on the second surfaces form a clean water outlet on the first short side;

[0024] Two adjacent basic membrane sheets that are opposite to each other with respect to the first surfaces form a raw water inlet on the second short side, and / or two adjacent basic membrane sheets that are opposite to each other with respect to the first surfaces form a raw water inlet on the first long side, and / or two adjacent basic membrane sheets that are opposite to each other with respect to the first surfaces form a raw water inlet on the second long side.

[0025] Preferably, two adjacent base membranes facing each other on the second surfaces are connected at the second short sides in a preset sealing manner or in a folding manner;

[0026] Two adjacent base membranes facing each other on the second surfaces are connected at the first long side in a preset sealing manner or in a folding manner;

[0027] Two adjacent base membranes facing each other on the second surfaces are connected at the second long sides in a preset sealing manner or in a folding manner.

[0028] Preferably, when the basic membrane sheets are in the unfolded state, a second supporting and draining layer is arranged between two adjacent basic membrane sheets.

[0029] Preferably, when the basic membrane sheet is in an unfolded state, a third supporting and draining layer is arranged above the uppermost basic membrane sheet.

[0030] Preferably, the first filter unit comprises a first filter layer and a first supporting drainage layer; the first supporting drainage layer and the first filter layer are stacked and then rolled to form the first filter unit in a cylindrical shape; the first supporting drainage layer is located between two adjacent circles of the first filter layer, so that the two adjacent circles of the first filter layer are spaced apart and connected;

[0031] When the first filter unit and the basic membrane are in an unfolded state, a portion of the first supporting and draining layer extends to be located below the basic membrane.

[0032] Preferably, the filter element comprises:

[0033] A waterproof layer, wherein the base membrane and the waterproof layer are in an unfolded state, the waterproof layer is located below the base membrane of the lowest layer, and the side of the waterproof layer away from the first short side is sealed and connected to the second short side of the second surface of the base membrane of the lowest layer facing downward;

[0034] When two adjacent basic membranes facing each other on the first surface form a raw water inlet on the first long side and the basic membrane and the waterproof layer are wound outside the first filter unit, the side of the waterproof layer closer to the first short side is sealed and connected to the second short side of the second surface of the topmost basic membrane facing upward.

[0035] Preferably, when two adjacent basic membrane sheets facing each other on the first surfaces form a raw water inlet on the first long side, the length of the first long side of the basic membrane sheet increases from the uppermost basic membrane sheet to the lowermost basic membrane sheet in the unfolded state.

[0036] Preferably, the basic membrane sheet extends along the horizontal direction, and the basic membrane sheet is folded at least once along a direction perpendicular to the first long side to form a stacked basic membrane sheet;

[0037] or,

[0038] The basic membrane sheet extends along the longitudinal direction, and the basic membrane sheet is folded at least once along a direction perpendicular to the first short side to form a stacked basic membrane sheet;

[0039] or,

[0040] There are a plurality of the basic membrane sheets, and the plurality of the basic membrane sheets are stacked to form the basic membrane sheet in a stacked state.

[0041] Preferably, the base diaphragm is made of PP cotton.

[0042] Preferably, the filter element comprises:

[0043] A central tube, wherein a through hole is provided on a side wall of the central tube, and the first filter unit and the second filter unit are sleeved outside the central tube;

[0044] When the second filter unit is sleeved outside the first filter unit, the inner side wall of the first filter unit forms a water outlet of the first filter unit, and the water outlet of the first filter unit is connected with the interior of the central tube through the through hole;

[0045] When the first filter unit is sleeved outside the second filter unit, the inner side wall of the second filter unit forms a clean water outlet of the second filter unit, and the clean water outlet of the second filter unit is connected with the interior of the central tube through the through hole.

[0046] A water purification device, comprising any filter element as described above.

[0047] The technical solution of the utility model has the following significant beneficial effects:

[0048] The filter element in the present application combines the first filter unit and the second filter unit in a nested manner, which can make the filter unit in the filter element simple to set and easy to produce and process; the water to be filtered can first pass through the first filter unit and then pass through the second filter unit for effective filtration, or the water to be filtered can first pass through the second filter unit and then pass through the first filter unit for effective filtration. When the water to be filtered passes through the first filter unit, it passes through in the radial direction, which can effectively ensure the filtration area of ​​the first filter unit and reduce the possibility of clogging. When the filtered water passes through the second filter unit, since the water enters from the raw water inlet, it completely passes through the basic membrane from the first surface to the second surface and then flows out from the clean water outlet, not only can the filtration area of ​​the second filter unit be effectively guaranteed, but also the space between the two first surfaces of the adjacent basic membranes can be used to effectively increase the pollution holding capacity of the second filter unit and reduce the possibility of clogging. The above method can achieve a high pollution holding capacity and a high water flow rate of the filter element. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] The drawings described herein are only for explanation purposes and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the components in the drawings are only for illustration purposes to help understand the present invention, and are not intended to specifically limit the shapes and proportional dimensions of the components of the present invention. Under the guidance of the present invention, those skilled in the art can select various possible shapes and proportional dimensions to implement the present invention according to specific circumstances.

[0050] Figure 1 This is a schematic diagram of the structure of the filter element in the first embodiment of the utility model;

[0051] Figure 2 This is a schematic diagram of the structure of the filter element in the second embodiment of the utility model;

[0052] Figure 3 This is a schematic diagram of the structure of the filter element in the embodiment of the utility model after the filter element is partially unfolded in the first implementation mode;

[0053] Figure 4 It is a schematic structural diagram of the unfolded first filter unit having the first supporting drainage layer in the embodiment of the utility model;

[0054] Figure 5 It is a schematic diagram of the structure of the first filter unit with the second filter layer after being unfolded in the embodiment of the utility model;

[0055] Figure 6 It is a schematic structural diagram of the unfolded first filter unit having a first supporting drainage layer and a second filter layer in an embodiment of the utility model;

[0056] Figure 7 It is a schematic structural diagram of the unfolded filter element having the water-proof layer, the second supporting drainage layer and the third supporting drainage layer in the embodiment of the utility model;

[0057] Figure 8 It is a cross-sectional view of a filter element with a central tube in an embodiment of the utility model;

[0058] Fig. 9 It is a schematic diagram of the structure of a filter element in an embodiment of the utility model after being partially unfolded in a feasible implementation manner;

[0059] Fig.10 It is a schematic diagram of the arrangement of the raw water inlet and the clean water outlet in one implementation manner after the second filter unit is unfolded in the embodiment of the utility model;

[0060] Fig.11 It is a schematic diagram of the arrangement of the raw water inlet and the clean water outlet in another implementation manner after the second filter unit is unfolded in the embodiment of the utility model;

[0061] Fig.12 It is a schematic diagram of the arrangement of the raw water inlet and the clean water outlet in another implementation manner after the second filter unit in the embodiment of the utility model is unfolded.

[0062] Reference numerals in the above drawings:

[0063] 1. First filter unit; 11. First filter layer; 12. First support drainage layer; 13. Second filter layer; 2. Second filter unit; 21. Basic membrane; 211. First surface; 212. Second surface; 213. First short side; 214. Second short side; 215. First long side; 216. Second long side; 22. Clean water outlet; 23. Raw water inlet; 24. Second support drainage layer; 25. Third support drainage layer; 3. Water-proof layer; 4. Center tube; 41. Through hole. DETAILED DESCRIPTION

[0064] The details of the present invention can be more clearly understood by combining the accompanying drawings with the description of the specific embodiments of the present invention. However, the specific embodiments of the present invention described herein are only used for the purpose of explaining the present invention and cannot be understood as limiting the present invention in any way. Under the guidance of the present invention, technicians can conceive of any possible variations based on the present invention, which should be considered to belong to the scope of the present invention.

[0065] In order to solve the problem that the existing filter element has low dirt holding capacity, which leads to easy clogging and low water flow, a filter element is proposed in this application. Figure 1 This is a schematic diagram of the structure of the filter element in the first embodiment of the utility model. Figure 2 This is a schematic diagram of the structure of the filter element in the second embodiment of the utility model. Figure 3 Schematic diagram of the structure of the filter element in the embodiment of the utility model after the filter element is partially unfolded in the first embodiment, as shown in FIG. Figures 1 to 3As shown, the filter element may include: a first filter unit 1, one of the water inlet and the water outlet of the first filter unit 1 is located on the inner wall of the first filter unit 1, and the other of the water inlet and the water outlet of the first filter unit 1 is located on the outer wall of the first filter unit 1; a second filter unit 2, the second filter unit 2 includes a basic membrane 21 that can be rolled up to form the second filter unit 2, the basic membrane 21 has opposite first short sides 213 and second short sides 214, opposite first long sides 215 and second long sides 216 in the unfolded state, the first short side 213 is the side where the second filter unit 2 starts to be rolled up; the basic membrane 21 has opposite first surfaces 211 and second surfaces 212; two first surfaces 211 or two second surfaces 212 of adjacent basic membranes 21 The two adjacent second surfaces 212 of the basic membrane sheets 21 facing each other form a clean water outlet 22 at at least one of the first short side 213, the second short side 214, the first long side 215 and the second long side 216; the two adjacent first surfaces 211 of the basic membrane sheets 21 facing each other form a raw water inlet 23 at at least one of the first short side 213, the second short side 214, the first long side 215 and the second long side 216, and the clean water outlet 22 and the raw water inlet 23 are located on different sides of the basic membrane sheet 21; when the second filter unit 2 is filtering, water enters from the raw water inlet 23, completely passes through the basic membrane sheet 21 from the first surface 211 to the second surface 212, and then flows out from the clean water outlet 22; the first filter unit 1 and the second filter unit 2 are nested.

[0066] The filter element in the present application combines the first filter unit 1 and the second filter unit 2 in a nested manner, which can make the filter unit setting in the filter element simple and convenient for production and processing; the water to be filtered can first pass through the first filter unit 1 and then pass through the second filter unit 2 for effective filtration, or the water to be filtered can first pass through the second filter unit 2 and then pass through the first filter unit 1 for effective filtration. When the water to be filtered passes through the first filter unit 1, it passes through in the radial direction, which can effectively ensure the filtration area of ​​the first filter unit 1 and reduce the possibility of clogging. When the filtered water passes through the second filter unit 2, since the water enters from the raw water inlet 23, it completely passes through the basic membrane 21 from the first surface 211 to the second surface 212 and then flows out from the clean water outlet 22, not only can the filtration area of ​​the second filter unit 2 be effectively guaranteed, but also the space between the two first surfaces 211 of the adjacent basic membranes 21 can effectively increase the pollution holding capacity of the second filter unit 2 and reduce the possibility of clogging. The above method can achieve a high pollution holding capacity and a high water flow rate of the filter element.

[0067] In order to better understand the filter element in this application, it will be further explained and illustrated below. Figure 1As shown, the first filter unit 1 is used to perform preliminary filtration on the water to be filtered to remove impurities such as particles with relatively large particle sizes and colloids in the water. The first filter unit 1 can be generally cylindrical. When the water to be filtered passes through the first filter unit 1 outwardly in the radial direction, the water inlet of the first filter unit 1 is located at the inner wall of the first filter unit 1, and the water outlet of the first filter unit 1 is located at the outer wall of the first filter unit 1. When the water to be filtered passes through the first filter unit 1 inwardly in the radial direction, the water inlet of the first filter unit 1 is located at the outer wall of the first filter unit 1, and the water outlet of the first filter unit 1 is located at the inner wall of the first filter unit 1.

[0068] Furthermore, the upper end and the lower end of the first filter unit 1 may be in a sealed state, so that the output direction of the filtered water can be controlled to avoid flowing out from the upper end and the lower end of the first filter unit 1 .

[0069] As feasible, the first filter unit 1 may include a first filter layer 11, and the first filter layer 11 is made of non-woven fabric. The first filter layer 11 may be formed into the first filter unit 1 by winding. The first filter unit 1 may also be directly formed by melt spraying. The first filter unit 1 may also be formed by other methods, which are not specifically limited in the present application.

[0070] like Figure 3 As shown, the second filter unit 2 includes a basic membrane sheet 21 that can be rolled to form the second filter unit 2. The basic membrane sheet 21 has a filtering effect on water. The basic membrane sheet 21 has a first short side 213 and a second short side 214 relative to each other, and a first long side 215 and a second long side 216 relative to each other in the unfolded state. The first short side 213 is the side where the second filter unit 2 starts to be rolled, that is, the basic membrane sheet 21 starts to be rolled along the first short side 213, thereby forming the second filter unit 2.

[0071] The basic membrane 21 has a first surface 211 and a second surface 212 opposite to each other. The two first surfaces 211 or the two second surfaces 212 of adjacent basic membranes 21 are spaced and opposite to each other. The basic membrane 21 with two adjacent second surfaces 212 opposite to each other forms a clean water outlet 22 at at least one of the first short side 213, the second short side 214, the first long side 215 and the second long side 216. The clean water formed after being filtered by the basic membrane 21 flows between the two adjacent basic membranes 21 with two second surfaces 212 opposite to each other, and then flows out of the second filter unit 2 from the clean water outlet 22.

[0072] The basic membrane sheets 21 with two adjacent first faces 211 facing each other form a raw water inlet 23 at at least one of the first short side 213, the second short side 214, the first long side 215 and the second long side 216, and the clean water outlet 22 and the raw water inlet 23 are located on different sides of the basic membrane sheet 21. The water to be filtered can be input into the second filter unit 2 through the raw water inlet 23, and then pass between the basic membrane sheets 21 with two adjacent first faces 211 facing each other. When the second filter unit 2 is filtering, water enters from the raw water inlet 23, completely passes through the basic membrane sheet 21 from the first face 211 to the second face 212, and then flows out from the clean water outlet 22.

[0073] Fig.10 Schematic diagram of the arrangement of the raw water inlet and the clean water outlet in one embodiment after the second filter unit is unfolded in the embodiment of the utility model, as shown in FIG. Fig.10 As shown, two adjacent first surfaces 211 of the basic membrane sheets 21 facing each other form a raw water inlet 23 on the second short side 214, and two adjacent second surfaces 212 of the basic membrane sheets 21 facing each other form a clean water outlet 22 on the first short side 213. In other feasible embodiments, two adjacent first surfaces 211 of the basic membrane sheets 21 facing each other form a raw water inlet 23 on the first long side 215 or the second long side 216.

[0074] Fig.11 FIG. 1 is a schematic diagram of another embodiment of the utility model in which the raw water inlet and the clean water outlet are arranged after the second filter unit is unfolded. Fig.11 As shown, the basic membrane 21 opposite to two adjacent first surfaces 211 forms a raw water inlet 23 at two or three of the second short side 214 , the first long side 215 and the second long side 216 , and the basic membrane 21 opposite to two adjacent second surfaces 212 forms a clean water outlet 22 at the first short side 213 .

[0075] Fig.12 FIG. 1 is a schematic diagram of the arrangement of the raw water inlet and the clean water outlet in another embodiment of the utility model after the second filter unit is unfolded, as shown in FIG. Fig.12 As shown, the basic membrane sheets 21 with two adjacent first surfaces 211 facing each other form a raw water inlet 23 at at least one of the second short side 214 and the second long side 216 , and the basic membrane sheets 21 with two adjacent second surfaces 212 facing each other form a purified water outlet 22 at the first long side 215 .

[0076] The above-mentioned methods are only part of the feasible implementation methods of the second filter unit. The arrangement of the raw water inlet 23 and the clean water outlet 22 of the second filter unit can also be realized by other implementation methods, which will not be listed one by one here.

[0077] As a feasible method, the basic membrane 21 can be made of PP cotton. Of course, in other feasible embodiments, the basic membrane 21 can also be made of other feasible filter membranes, which are not limited in this application.

[0078] like Figure 1 and Figure 2 As shown, the first filter unit 1 and the second filter unit 2 can be nested.

[0079] like Figure 1 As shown, in the first embodiment, the second filter unit 2 is sleeved outside the first filter unit 1 .

[0080] In this embodiment, in a specific embodiment, the water inlet of the first filter unit 1 may be located at the outer side wall of the first filter unit 1, and the water outlet of the first filter unit 1 is located at the inner side wall of the first filter unit 1. The clean water outlet 22 of the second filter unit 2 is located at the inner side wall of the second filter unit 2, and the clean water outlet 22 of the second filter unit 2 is connected to the water inlet of the first filter unit 1. The raw water inlet 23 of the second filter unit 2 may include but is not limited to one of the following: the outer side wall of the second filter unit 2, the upper end of the second filter unit 2, and the lower end of the second filter unit 2.

[0081] The water to be filtered can first enter the second filter unit 2 through the raw water inlet 23 of the second filter unit 2. After being filtered by the second filter unit 2, it flows out from the clean water outlet 22 at the inner wall of the second filter unit 2 and then enters the water inlet at the outer wall of the first filter unit 1. The water passes through the first filter unit 1 inwardly along the radial direction and flows out from the water outlet at the inner wall of the first filter unit 1.

[0082] In other feasible embodiments, the clean water outlet 22 of the second filter unit 2 may be located at, but not limited to, one of the following: the outer wall of the second filter unit 2, the upper end of the second filter unit 2, or the lower end of the second filter unit 2; the raw water inlet 23 of the second filter unit 2 may be located at, but not limited to, one of the following: the inner wall of the second filter unit 2, the outer wall of the second filter unit 2, the upper end of the second filter unit 2, or the lower end of the second filter unit 2. The clean water outlet 22 and the raw water inlet 23 may be located at different positions of the second filter unit 2.

[0083] In this embodiment, in another specific embodiment, the water inlet of the first filter unit 1 is located at the inner wall of the first filter unit 1, and the water outlet of the first filter unit 1 is located at the outer wall of the first filter unit 1. The raw water inlet 23 of the second filter unit 2 can be located at, but not limited to, one of the following: the inner wall of the second filter unit 2, the outer wall of the second filter unit 2, the upper end of the second filter unit 2, and the lower end of the second filter unit 2. The clean water outlet 22 of the second filter unit 2 can be located at, but not limited to, one of the following: the inner wall of the second filter unit 2, the outer wall of the second filter unit 2, the upper end of the second filter unit 2, and the lower end of the second filter unit 2. The clean water outlet 22 and the raw water inlet 23 can be located at different positions of the second filter unit 2.

[0084] The water to be filtered may first pass through the water inlet at the inner wall of the first filter unit 1, and the water passes through the first filter unit 1 outward in the radial direction and flows out from the water outlet at the outer wall of the first filter unit 1. After that, the water enters the second filter unit 2 from the raw water inlet 23 of the second filter unit 2, and after being filtered by the second filter unit 2, flows out from the clean water outlet 22 of the second filter unit 2.

[0085] Preferably, the raw water inlet 23 of the second filter unit 2 is located on the inner side wall of the second filter unit 2, and the raw water inlet 23 of the second filter unit 2 is connected to the water outlet of the first filter unit 1. With this structure, the raw water inlet 23 of the second filter unit 2 can be directly connected to the water outlet of the first filter unit 1 without other auxiliary components.

[0086] like Figure 2 As shown, in the second embodiment, the first filter unit 1 is sleeved outside the second filter unit 2 .

[0087] In this embodiment, in a specific embodiment, the water inlet of the first filter unit 1 is located at the outer side wall of the first filter unit 1, and the water outlet of the first filter unit 1 is located at the inner side wall of the first filter unit 1. The raw water inlet 23 of the second filter unit 2 can be located at, but not limited to, one of the following: the inner side wall of the second filter unit 2, the outer side wall of the second filter unit 2, the upper end of the second filter unit 2, and the lower end of the second filter unit 2. The clean water outlet 22 of the second filter unit 2 can be located at, but not limited to, one of the following: the inner side wall of the second filter unit 2, the outer side wall of the second filter unit 2, the upper end of the second filter unit 2, and the lower end of the second filter unit 2. The clean water outlet 22 and the raw water inlet 23 can be located at different positions of the second filter unit 2.

[0088] Preferably, the raw water inlet 23 of the second filter unit 2 can be located on the outer side wall of the second filter unit 2, and the water outlet of the first filter unit 1 is connected to the raw water inlet 23 of the second filter unit 2. With this structure, the raw water inlet 23 of the second filter unit 2 can be directly connected to the water outlet of the first filter unit 1 without other auxiliary components.

[0089] The water to be filtered may first pass through the water inlet portion at the outer wall of the first filter unit 1, and the water passes through the first filter unit 1 inwardly along the radial direction, and flows out from the water outlet portion at the inner wall of the first filter unit 1. Afterwards, the water enters the second filter unit 2 from the raw water inlet 23 of the second filter unit 2, and after being filtered by the second filter unit 2, flows out from the clean water outlet 22 of the second filter unit 2.

[0090] In this embodiment, in another specific embodiment, the water inlet of the first filter unit 1 is located at the inner wall of the first filter unit 1, and the water outlet of the first filter unit 1 is located at the outer wall of the first filter unit 1. The raw water inlet 23 of the second filter unit 2 can be located at, but not limited to, one of the following: the inner wall of the second filter unit 2, the outer wall of the second filter unit 2, the upper end of the second filter unit 2, and the lower end of the second filter unit 2. The clean water outlet 22 of the second filter unit 2 can be located at, but not limited to, one of the following: the inner wall of the second filter unit 2, the outer wall of the second filter unit 2, the upper end of the second filter unit 2, and the lower end of the second filter unit 2. The clean water outlet 22 and the raw water inlet 23 can be located at different positions of the second filter unit 2.

[0091] Preferably, the purified water outlet 22 of the second filter unit 2 is located at the outer side wall of the second filter unit 2 , and the water inlet of the first filter unit 1 is communicated with the purified water outlet 22 of the second filter unit 2 .

[0092] The water to be filtered can first enter the second filter unit 2 from the raw water inlet 23 of the second filter unit 2, and after being filtered by the second filter unit 2, flow out from the clean water outlet 22 of the second filter unit 2; thereafter, through the water inlet at the inner wall of the first filter unit 1, the water passes through the first filter unit 1 outward in a radial direction, and flows out from the water outlet at the outer wall of the first filter unit 1.

[0093] As feasible, Figure 4 FIG. 1 is a schematic diagram of the structure of the first filter unit with the first supporting drainage layer after being unfolded in the embodiment of the utility model. Figure 4As shown, when the first filter unit 1 includes the first filter layer 11, the first filter unit 1 may also include a first support drainage layer 12. The first support drainage layer 12 and the first filter layer 11 are stacked and wound to form the first filter unit 1 in a cylindrical shape; the first support drainage layer 12 is located between two adjacent circles of the first filter layer 11, so that the first filter layers 11 of the two adjacent circles are spaced and connected. The first support drainage layer 12 has a certain thickness, so that there can be a gap between the first filter layers 11 of adjacent layers. The gap can be used to effectively increase the dirt holding capacity of the first filter unit 1 and reduce the possibility of clogging. The high dirt holding capacity and high water flow rate of the filter element can be further achieved in the above manner.

[0094] As a feasible method, the first supporting and draining layer 12 may include at least one of the following: a grid, a sheet having a preset thickness and a mesh structure on the surface.

[0095] As a feasible method, the first supporting drainage layer 12 needs to have a suitable thickness so that the first filter layers 11 do not stick to each other, and the first filter layer 11 is not wound too little, resulting in poor filtering effect. Through experiments, it was found that the thickness of the first supporting drainage layer 12 is more suitable between 5 mils and 20 mils. In order to make the first supporting drainage layer 12 have a better drainage effect, the mesh rule of the first supporting drainage layer 12 is 10-50 mesh wires per inch, so that a relatively stable porous structure can be formed.

[0096] As feasible, Figure 5 FIG. 1 is a schematic diagram of the structure of the first filter unit with the second filter layer after being unfolded in the embodiment of the utility model. Figure 5 As shown, when the first filter unit 1 includes the first filter layer 11, the first filter unit 1 may further include a second filter layer 13. The second filter layer 13 is made of carbon fiber. The first filter layer 11 and the second filter layer 13 are stacked and wound to form the first filter unit 1 in a cylindrical shape. With the above structure, when the water to be filtered flows through the first filter unit 1 in a radial direction for filtration, the water will also pass through the second filter layer 13 made of carbon fiber at the same time, so that pollutants such as residual chlorine, odor, discoloration, heavy metals, etc. in the water can be adsorbed to improve the quality of the water, and the taste of the water can also be improved.

[0097] As feasible, Figure 6 FIG. 1 is a schematic diagram of the structure of the first filter unit 1 after it is unfolded, which has a first support and drainage layer and a second filter layer 13 in the embodiment of the utility model. Figure 6As shown, when the first filter unit 1 includes the first filter layer 11, the first filter unit 1 may also include a second filter layer 13 and a first support and drainage layer 12; the second filter layer 13 is made of carbon fiber; the first filter layer 11 and the second filter layer 13 and the first support and drainage layer 12 are stacked and wound to form a cylindrical first filter unit 1. The above method can not only further achieve a high dirt holding capacity and a high water flow rate of the filter element, but also absorb pollutants such as residual chlorine, odor, discoloration, heavy metals, etc. in the water to improve the quality of the water, and also improve the taste of the water.

[0098] Further, when the water inlet of the first filter unit 1 is located at the outer wall of the first filter unit 1, the first filter layer 11 and the second filter layer 13 and the first support drainage layer 12 arranged in parallel are stacked and arranged, and then the first filter layer 11 is wound from one side of the first filter layer 11, and at least part of the second filter layer 13 is closer to the side of the first filter unit 1 where the winding starts relative to the first support drainage layer 12. In this way, in the first filter unit 1 after winding, the first support drainage layer 12 is located on the relative outer side, and the second filter layer 13 is located on the relative inner side. When the water to be filtered flows inwardly through the first filter unit 1 in the radial direction for filtering, it first passes through the first support drainage layer 12. When the water is just filtered, it contains relatively more impurities. At this time, the first support drainage layer 12 can preferentially accommodate these impurities that are filtered out; when the water to be filtered reaches the inner side of the first filter unit 1, the remaining impurities in the water are relatively less. At this time, the first support drainage layer 12 is not needed, and the second filter layer 13 is used to perform other functional treatments on the water.

[0099] For the second filter unit 2, when the second filter unit 2 is sleeved outside the first filter unit 1; the water inlet of the first filter unit 1 is located on the outer wall of the first filter unit 1, and the water outlet of the first filter unit 1 is located on the inner wall of the first filter unit 1; the clean water outlet 22 of the second filter unit 2 is located on the inner wall of the second filter unit 2, and the clean water outlet 22 of the second filter unit 2 is connected to the water inlet of the first filter unit 1, the basic membrane sheets 21 with two adjacent second surfaces 212 facing each other form a clean water outlet 22 on the first short side 213; the basic membrane sheets 21 with two adjacent first surfaces 211 facing each other form a raw water inlet 23 on the second short side 214, and / or, the basic membrane sheets 21 with two adjacent first surfaces 211 facing each other form a raw water inlet 23 on the first long side 215, and / or, the basic membrane sheets 21 with two adjacent first surfaces 211 facing each other form a raw water inlet 23 on the second long side 216.

[0100] In the above embodiment, the two adjacent second surfaces 212 of the base film 21 opposite to each other can be connected in a preset sealing manner or in a folding manner at the second short side 214. The two adjacent second surfaces 212 of the base film 21 opposite to each other are connected in a preset sealing manner or in a folding manner at the first long side 215. The two adjacent second surfaces 212 of the base film 21 opposite to each other are connected in a preset sealing manner or in a folding manner at the second long side 216.

[0101] As feasible, Figure 7 FIG. 2 is a schematic diagram of the structure of the filter element with the waterproof layer, the second supporting drainage layer 24 and the third supporting drainage layer 25 after the filter element is partially unfolded in the embodiment of the utility model. Figure 7 As shown, when the base diaphragm 21 is in the unfolded state, a second supporting drainage layer 24 is provided between two adjacent base diaphragms 21. The second supporting drainage layer 24 can ensure the gap between the two adjacent base diaphragms 21, thereby ensuring the flow of water between the two base diaphragms 21, and also ensuring the amount of dirt held between the two adjacent base diaphragms 21 with the first surfaces 211 facing each other.

[0102] In order to ensure the gap between the innermost base membrane 21 of the second filter unit 2 and the outer wall of the first filter unit 1 after winding, so as to ensure the water flow, as shown in FIG. Figure 7 As shown, when the base membrane 21 is in the unfolded state, a third supporting and draining layer 25 is arranged above the uppermost base membrane 21 .

[0103] When the first filter unit 1 includes the first filter layer 11 and the first supporting and draining layer 12, it is feasible that Figure 7 As shown, when the first filter unit 1 and the base membrane 21 are in the unfolded state, part of the first support drainage layer 12 can extend to the bottom of the base membrane 21. With the above structure, when the filter element is wound, after the first filter unit 1 is wound, due to the presence of the first support drainage layer 12, the second filter unit 2 can be immediately wound onto the first filter unit 1, making the entire manufacturing process more convenient and quick. In addition, after the second filter unit 2 is wound, the outermost side of the base membrane 21 of the second filter unit 2 can have the first support drainage layer 12.

[0104] As feasible, Figure 7As shown, the filter element may include: a waterproof layer 3. When the base diaphragm 21 and the waterproof layer 3 are in the unfolded state, the waterproof layer 3 is located below the bottom base diaphragm 21, and the side of the waterproof layer 3 away from the first short side 213 is sealed and connected to the second short side 214 of the bottom base diaphragm 21 facing the second surface 212 below. When two adjacent base diaphragms 21 with opposite first surfaces 211 form a raw water inlet 23 on the first long side 215, and the base diaphragm 21 and the waterproof layer 3 are wound and arranged outside the first filter unit 1, the side of the waterproof layer 3 closer to the first short side 213 is sealed and connected to the second short side 214 of the second surface 212 facing the top of the top base diaphragm 21. Through the above structure, it can be ensured that the remaining areas of the outer wall of the second filter unit 2 after winding, except for the raw water inlet 23, are in a sealed state.

[0105] When part of the first supporting and draining layer 12 can extend to be located below the base membrane 21, as Figure 7 As shown, the waterproof layer 3 can be located below a portion of the first supporting and draining layer 12 .

[0106] As feasible, Fig. 9 FIG. 1 is a schematic diagram of a structure of a filter element in a feasible implementation mode according to an embodiment of the utility model after partial expansion. Fig. 9 As shown, when the base membrane sheets 21 with two adjacent first faces 211 facing each other form a raw water inlet 23 at the first long side 215, the length of the first long side 215 of the base membrane sheets 21 can increase from the uppermost base membrane sheet 21 to the lowermost base membrane sheet 21 when the base membrane sheets 21 are in the unfolded state. After the base membrane sheets 21 are wound into the second filter unit 2, more water to be filtered enters the flow channel between the two adjacent first faces 211 facing each other on the outer side through the raw water inlet 23, so the filtering area of ​​the base membrane sheets 21 corresponding to the flow channel can be increased by the above method to ensure a high water flow rate.

[0107] There are many ways to form the basic membrane sheet 21. For example, the basic membrane sheet 21 extends along the horizontal direction, and the basic membrane sheet 21 is folded at least once in a direction perpendicular to the first long side 215 to form a stacked basic membrane sheet 21; for another example, the basic membrane sheet 21 extends along the longitudinal direction, and the basic membrane sheet 21 is folded at least once in a direction perpendicular to the first short side 213 to form a stacked basic membrane sheet 21; for another example, there are multiple basic membrane sheets 21, and multiple basic membrane sheets 21 are stacked to form a stacked basic membrane sheet 21.

[0108] In order to facilitate the winding of the first filter unit 1 and / or the second filter unit 2 to form a filter element, and also to facilitate the input or output of water, it is feasible to: Figure 8 FIG. 4 is a cross-sectional view of a filter element with a central tube in an embodiment of the present utility model. Figure 8 As shown, the filter element may include: a central tube 4 , a through hole 41 is provided on the side wall of the central tube 4 , and a first filter unit 1 and a second filter unit 2 are sleeved outside the central tube 4 .

[0109] When the second filter unit 2 is sleeved outside the first filter unit 1, the inner side wall of the first filter unit 1 forms the water outlet of the first filter unit 1, and the water outlet of the first filter unit 1 is connected to the interior of the central tube 4 through the through hole 41. When the first filter unit 1 is sleeved outside the second filter unit 2, the inner side wall of the second filter unit 2 forms the clean water outlet 22 of the second filter unit 2, and the clean water outlet 22 of the second filter unit 2 is connected to the interior of the central tube 4 through the through hole 41.

[0110] As a feasible method, the filter element may include: a shell, a first filter unit 1, a second filter unit 2 and a central tube 4 are arranged in the upper shell, and the shell has a water inlet for inputting water to be filtered into the shell and a water outlet for discharging the clean water formed by filtration in the shell.

[0111] The present application also proposes a water purification device, which includes any of the filter elements described above.

[0112] All articles and references disclosed, including patent applications and publications, are incorporated herein by reference for various purposes. The term "consisting essentially of ... " describing a combination should include determined elements, ingredients, parts or steps and other elements, ingredients, parts or steps that do not substantially affect the basic novel features of the combination. The use of the terms "comprising" or "including" to describe the combination of elements, ingredients, parts or steps here also contemplates the implementation method consisting essentially of these elements, ingredients, parts or steps. Here, by using the term "may", it is intended to illustrate that any attribute described that "may" includes is optional. Multiple elements, ingredients, parts or steps can be provided by a single integrated element, ingredient, part or step. Alternatively, a single integrated element, ingredient, part or step can be divided into separate multiple elements, ingredients, parts or steps. The disclosure "one" or "one" used to describe an element, ingredient, part or step is not said to exclude other elements, ingredients, parts or steps.

[0113] Each embodiment in this specification is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. The above embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable people familiar with this technology to understand the content of the utility model and implement it accordingly, and cannot be used to limit the protection scope of the utility model. Any equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A filter element, characterized in that: The filter element comprises: a first filter unit, wherein one of a water inlet and a water outlet of the first filter unit is located on an inner side wall of the first filter unit, and the other of the water inlet and the water outlet of the first filter unit is located on an outer side wall of the first filter unit; A second filter unit, the second filter unit comprises a basic membrane sheet that can be rolled into the second filter unit, the basic membrane sheet having opposite first short sides and second short sides, opposite first long sides and second long sides in an unfolded state, the first short side being the side at which the second filter unit starts to be rolled; the basic membrane sheet having opposite first and second sides; two first sides or two second sides of adjacent basic membrane sheets being spaced and opposite to each other; the two adjacent basic membrane sheets with opposite second sides forming a clean water outlet at at least one of the first short side, the second short side, the first long side and the second long side; the two adjacent basic membrane sheets with opposite first sides forming a raw water inlet at at least one of the first short side, the second short side, the first long side and the second long side, the clean water outlet and the raw water inlet being located on different sides of the basic membrane sheet; when the second filter unit is filtering, water enters from the raw water inlet, completely passes through the basic membrane sheet from the first side to the second side, and then flows out from the clean water outlet; The first filter unit and the second filter unit are nested.

2. The filter element according to claim 1, characterized in that: The second filter unit is sleeved outside the first filter unit; the water inlet of the first filter unit is located on the outer wall of the first filter unit, and the water outlet of the first filter unit is located on the inner wall of the first filter unit; the clean water outlet of the second filter unit is located on the inner wall of the second filter unit, and the clean water outlet of the second filter unit is connected to the water inlet of the first filter unit.

3. The filter element according to claim 1, characterized in that: The second filter unit is sleeved outside the first filter unit; the water inlet of the first filter unit is located on the inner side wall of the first filter unit, and the water outlet of the first filter unit is located on the outer side wall of the first filter unit; the raw water inlet of the second filter unit is located on the inner side wall of the second filter unit, and the raw water inlet of the second filter unit is connected to the water outlet of the first filter unit; or, The first filter unit is sleeved outside the second filter unit; the water inlet of the first filter unit is located on the outer wall of the first filter unit, and the water outlet of the first filter unit is located on the inner wall of the first filter unit; the raw water inlet of the second filter unit is located on the outer wall of the second filter unit, and the water outlet of the first filter unit is connected to the raw water inlet of the second filter unit; or, The first filter unit is sleeved outside the second filter unit; the water inlet of the first filter unit is located on the inner wall of the first filter unit, and the water outlet of the first filter unit is located on the outer wall of the first filter unit; the clean water outlet of the second filter unit is located on the outer wall of the second filter unit, and the water inlet of the first filter unit is connected to the clean water outlet of the second filter unit.

4. The filter element according to claim 1, characterized in that: The first filter unit includes a first filter layer, and the first filter layer is made of non-woven fabric.

5. The filter element according to claim 4, characterized in that: The first filter unit also includes a first supporting drainage layer; the first supporting drainage layer and the first filter layer are stacked and then rolled to form the first filter unit in a cylindrical shape; the first supporting drainage layer is located between two adjacent circles of the first filter layer, so that the two adjacent circles of the first filter layer are spaced and connected.

6. The filter element according to claim 4, characterized in that: The first filter unit further comprises a second filter layer, wherein the second filter layer is made of carbon fiber; The first filter layer and the second filter layer are stacked and then rolled to form the first filter unit in a cylindrical shape.

7. The filter element according to claim 4, characterized in that: The first filter unit also includes a second filter layer and a first supporting drainage layer; the second filter layer is made of carbon fiber; the first filter layer and the second filter layer and the first supporting drainage layer arranged in parallel are stacked and then rolled to form the first filter unit in a cylindrical shape.

8. The filter element according to claim 7, characterized in that: When the water inlet of the first filter unit is located at the outer wall of the first filter unit, the first filter layer is stacked with the second filter layer and the first supporting drainage layer arranged in parallel and then starts to wind from one side of the first filter layer, and at least part of the second filter layer is closer to the side of the first filter unit where the winding starts than the first supporting drainage layer.

9. The filter element according to claim 5 or 7, characterized in that: The first supporting and draining layer includes at least one of the following: a grid, or a sheet material with a preset thickness and a mesh structure on the surface.

10. The filter element according to claim 1, characterized in that: The upper end and the lower end of the first filter unit are in a sealed state.

11. The filter element according to claim 2, characterized in that: Two adjacent basic membranes facing each other on the second surfaces form a clean water outlet on the first short side; Two adjacent basic membrane sheets that are opposite to each other with respect to the first surfaces form a raw water inlet on the second short side, and / or two adjacent basic membrane sheets that are opposite to each other with respect to the first surfaces form a raw water inlet on the first long side, and / or two adjacent basic membrane sheets that are opposite to each other with respect to the first surfaces form a raw water inlet on the second long side.

12. The filter element according to claim 11, characterized in that: Two adjacent base membranes facing each other on the second surfaces are connected at the second short sides in a preset sealing manner or in a folding manner; Two adjacent base membranes facing each other on the second surfaces are connected at the first long side in a preset sealing manner or in a folding manner; Two adjacent base membranes facing each other on the second surfaces are connected at the second long sides in a preset sealing manner or in a folding manner.

13. The filter element according to claim 11, characterized in that: When the basic membrane sheets are in an unfolded state, a second supporting and draining layer is arranged between two adjacent basic membrane sheets.

14. The filter element according to claim 11, characterized in that: When the basic membrane sheet is in an unfolded state, a third supporting and draining layer is arranged above the uppermost basic membrane sheet.

15. The filter element according to claim 11, characterized in that: The first filter unit comprises a first filter layer and a first support and drainage layer; the first support and drainage layer and the first filter layer are stacked and then rolled to form the first filter unit in a cylindrical shape; the first support and drainage layer is located between two adjacent circles of the first filter layer, so that the two adjacent circles of the first filter layer are spaced and connected; When the first filter unit and the basic membrane are in an unfolded state, a portion of the first supporting and draining layer extends to be located below the basic membrane.

16. The filter element according to claim 11, characterized in that: The filter element comprises: A waterproof layer, wherein the base membrane and the waterproof layer are in an unfolded state, the waterproof layer is located below the base membrane of the lowest layer, and the side of the waterproof layer away from the first short side is sealed and connected to the second short side of the second surface of the base membrane of the lowest layer facing downward; When two adjacent basic membranes facing each other on the first surfaces form a raw water inlet on the first long side and the basic membrane and the waterproof layer are wound outside the first filter unit, the side of the waterproof layer closer to the first short side is sealed and connected to the second short side of the second surface of the topmost basic membrane facing upward.

17. The filter element according to claim 11, characterized in that When two adjacent basic membrane sheets facing each other on the first surfaces form a raw water inlet on the first long side, the length of the first long side of the basic membrane sheet increases from the uppermost basic membrane sheet to the lowermost basic membrane sheet in the unfolded state.

18. The filter element according to claim 11, characterized in that: The basic membrane sheet extends along the horizontal direction, and the basic membrane sheet is folded at least once along the direction perpendicular to the first long side to form a stacked basic membrane sheet; or, The basic membrane sheet extends along the longitudinal direction, and the basic membrane sheet is folded at least once along a direction perpendicular to the first short side to form a stacked basic membrane sheet; or, There are a plurality of the basic membrane sheets, and the plurality of the basic membrane sheets are stacked to form the basic membrane sheet in a stacked state.

19. The filter element according to claim 1, characterized in that The basic diaphragm is made of PP cotton.

20. The filter element according to claim 1, characterized in that The filter element comprises: A central tube, wherein a through hole is provided on a side wall of the central tube, and the first filter unit and the second filter unit are sleeved outside the central tube; When the second filter unit is sleeved outside the first filter unit, the inner side wall of the first filter unit forms a water outlet of the first filter unit, and the water outlet of the first filter unit is connected with the interior of the central tube through the through hole; When the first filter unit is sleeved outside the second filter unit, the inner side wall of the second filter unit forms a clean water outlet of the second filter unit, and the clean water outlet of the second filter unit is connected with the interior of the central tube through the through hole.

21. A water purification device, characterized in that: The water purification device comprises a filter element as described in any one of claims 1-20.

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