Composite filter element and water purifying device
By placing scale-inhibiting material between the pre-filter and the membrane filter, the problem of scale buildup in the membrane filter is solved, extending its service life and improving water purification efficiency. At the same time, the filter structure design is optimized, resulting in a compact composite filter.
Patent Information
- Application Number
- CN202522523927.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-27
- Publication Date
- 2026-11-03
- Estimated Expiration
- 2035-11-27
AI Technical Summary
In existing water purification devices, membrane filter cartridges are prone to scaling when treating water filtered by pre-filter cartridges, which affects the water purification effect and service life.
A scale inhibitor is placed between the outlet end of the pre-filter and the inlet end of the membrane filter. The scale inhibitor treats the water filtered by the pre-filter, reducing the entry of easily scale-forming substances into the membrane filter. Combined with the structural design of the pre-filter being sleeved on the outer periphery of the membrane filter, a compact composite filter is formed.
It effectively extends the service life of the membrane filter element, improves the water purification effect, and makes the composite filter element structure compact, reducing the space occupied.
Smart Images
Figure CN224930425U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of water treatment technology, and in particular to a composite filter element and a water purification device. Background Technology
[0002] With the improvement of living standards, people are paying more and more attention to water quality and hygiene, and equipping households with water purification devices has become a common trend. Water purification devices can effectively remove impurities and bacteria from water through filtration and other methods, conveniently producing pure water that can be drunk directly, providing a strong guarantee for people's healthy drinking water.
[0003] However, existing water purification devices are usually equipped with multiple filter cartridges to ensure the water purification effect. For example, the water to be filtered passes through a pre-filter and a membrane filter in sequence. However, in actual application, the membrane filter is more prone to scaling when processing water filtered by the pre-filter, which affects the water purification effect and the service life of the membrane filter.
[0004] Therefore, there is an urgent need to propose a composite filter element and water purification device to solve the above-mentioned technical problems. Utility Model Content
[0005] The purpose of this invention is to provide a composite filter element and a water purification device, which helps to extend the service life of the membrane filter element and improve the water purification effect.
[0006] To achieve this objective, the present invention adopts the following technical solution:
[0007] In a first aspect, the present invention provides a composite filter element, including a housing, and a pre-filter element and a membrane filter element disposed inside the housing;
[0008] The pre-filter is sleeved on the outer periphery of the membrane filter, and a water inlet cavity is formed between the pre-filter and the inner wall of the housing. The housing is provided with a water inlet communicating with the water inlet cavity, a pure water outlet communicating with the membrane filter, and a wastewater outlet. A scale inhibitor is provided between the water outlet end of the pre-filter and the water inlet end of the membrane filter.
[0009] In some embodiments, a placement cavity is formed by the inner side of the pre-filter, the water inlet end of the membrane filter, and the inner side of the end face of the housing, and the scale inhibitor is disposed in the placement cavity.
[0010] In some embodiments, the composite filter element further includes a first end cap, which is connected to the pre-filter element and can block the end face opening of the pre-filter element. The scale inhibitor is disposed in the space between the first end cap and the water inlet end of the membrane filter element, and the first end cap is used to support the scale inhibitor.
[0011] In some embodiments, the first end cap includes an end wall and a circumferential side wall, and an accommodating space is formed between the end wall and the circumferential side wall. The pre-filter element is located within the accommodating space, and a portion of the outer circumferential wall of the pre-filter element is attached to the inner surface of the circumferential side wall. The scale inhibitor is disposed within the space formed by the inner side of the pre-filter element, the water inlet end of the membrane filter element, and the inner surface of the end wall.
[0012] In some embodiments, a positioning portion is provided on the inner surface of the end wall, the pre-filter is configured to be snapped between the positioning portion and the inner surface of the circumferential sidewall, and the scale inhibitor is configured to be located inside the positioning portion.
[0013] In some embodiments, the composite filter element further includes a second end cap, which is disposed at both ends of the pre-filter element along with the first end cap. A water passage gap exists between the inner peripheral wall of the pre-filter element and the outer peripheral wall of the membrane filter element. The second end cap is connected to the outer peripheral wall of the membrane filter element and the pre-filter element. The second end cap can block the end of the water passage gap away from the first end cap.
[0014] In some embodiments, the water inlet, the pure water outlet, and the wastewater outlet are all located on the same shell wall of the housing.
[0015] In some embodiments, the water outlet end of the membrane filter element is connected to a third end cap, the third end cap is connected to the housing, the pure water outlet and the wastewater outlet are located inside the third end cap, the water inlet is located outside the third end cap, and a flow guiding cavity is formed between the third end cap and the inner wall of the housing, and the water inlet, the flow guiding cavity and the water inlet cavity are connected.
[0016] In some embodiments, the pre-filter includes a non-woven fabric layer, a PP cotton layer, an origami PP layer, and an activated carbon layer stacked in sequence.
[0017] And / or, the membrane filter element includes at least one of nanofiltration membrane and reverse osmosis membrane.
[0018] Secondly, this utility model provides a water purification device, including the composite filter element described in any one of the first aspects.
[0019] The beneficial effects of this utility model are:
[0020] The composite filter element provided by this utility model places the scale-inhibiting material between the outlet end of the pre-filter element and the inlet end of the membrane filter element. This allows the water filtered by the pre-filter element to first pass through the scale-inhibiting material, which then inhibits scale formation in the water. Scale-forming substances in the water accumulate at the scale-inhibiting material, significantly reducing the content of these substances in the water entering the membrane filter element. This reduces the likelihood of scale formation at the source, extending the lifespan of the membrane filter element and improving water purification efficiency. Furthermore, the design of the pre-filter element being fitted around the membrane filter element makes the overall structure of the composite filter element more compact and smaller, thus reducing the space it occupies.
[0021] The water purification device provided by this utility model has a better water purification effect due to the use of the above-mentioned composite filter element. Attached Figure Description
[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.
[0023] Figure 1 This is a cross-sectional view of the composite filter element provided in an embodiment of this utility model.
[0024] In the picture:
[0025] 1. Shell; 11. Inlet; 12. Pure water outlet; 13. Wastewater outlet;
[0026] 2. Pre-filter;
[0027] 3. Membrane filter element;
[0028] 4. Scale inhibitor materials;
[0029] 5. Placement cavity;
[0030] 6. First end cap; 61. End wall; 62. Circumferential side wall; 63. Positioning part;
[0031] 7. Second end cap;
[0032] 8. Third end cap;
[0033] 10. Inlet chamber; 20. Water passage gap; 30. Flow guide chamber. Detailed Implementation
[0034] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0035] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.
[0036] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0037] In the description of this utility model, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.
[0038] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0039] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0040] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.
[0041] Existing water purification devices typically employ multiple filter stages to ensure effective purification. For example, water is filtered sequentially through a pre-filter and a membrane filter. However, in practice, membrane filters are more prone to scaling when processing water already filtered by the pre-filter, thus affecting purification efficiency and the lifespan of the membrane filter. Therefore, anti-scaling treatments are necessary for membrane filters, such as adding scale inhibitors. However, current scale inhibitors are usually placed inside the membrane filter and cannot completely solve the scaling problem.
[0042] This embodiment provides a water purification device, including a composite filter element.
[0043] like Figure 1 As shown, the composite filter element includes a housing 1, and a pre-filter element 2 and a membrane filter element 3 disposed inside the housing 1.
[0044] The pre-filter element 2 is fitted around the outer periphery of the membrane filter element 3, forming an inlet cavity 10 between the pre-filter element 2 and the inner wall of the housing 1. The housing 1 is provided with an inlet 11 communicating with the inlet cavity 10, a pure water outlet 12 communicating with the membrane filter element 3, and a wastewater outlet 13. A scale inhibitor 4 is provided between the outlet end of the pre-filter element 2 and the inlet end of the membrane filter element 3.
[0045] The water to be filtered flows into the inlet chamber 10 from the inlet 11 and passes through the pre-filter 2, scale inhibitor 4 and membrane filter 3 in sequence. The pure water generated by the membrane filter 3 flows out from the pure water outlet 12, and the wastewater generated by the membrane filter 3 flows out from the wastewater outlet 13.
[0046] The composite filter element provided in this embodiment, by placing the scale-inhibiting material 4 between the outlet end of the pre-filter element 2 and the inlet end of the membrane filter element 3, allows the water filtered by the pre-filter element 2 to first pass through the scale-inhibiting material 4. The scale-inhibiting material 4 inhibits scale formation in the water filtered by the pre-filter element 2, causing easily scale-forming substances in the water to accumulate at the scale-inhibiting material 4. In this way, the content of easily scale-forming substances in the water entering the membrane filter element 3 is significantly reduced, reducing the possibility of scale formation in the membrane filter element 3 from the source, which helps to extend the service life of the membrane filter element 3 and improve the water purification effect. In addition, the structural design of the pre-filter element 2 being fitted around the membrane filter element 3 makes the overall structure of the composite filter element more compact and smaller in size, thereby reducing the space occupied.
[0047] The water purification device provided in this embodiment has a better water purification effect due to the use of the above-mentioned composite filter element.
[0048] Optionally, the scale inhibitor 4 can be a chemical scale inhibitor, a porous adsorbent, etc., without specific limitations.
[0049] Optionally, the scale inhibitor 4 is a granular material. The independently set scale inhibitor 4 can be more precisely controlled in terms of dosage through a clear filling amount or molding standard, thereby avoiding the scale inhibition effect being affected by insufficient content or insufficient uniformity of the scale inhibitor 4.
[0050] like Figure 1 As shown, in some embodiments, a placement cavity 5 is formed by surrounding the inner side of the pre-filter 2, the water inlet end of the membrane filter 3, and the inner side of the end face of the housing 1, and the scale inhibitor 4 is disposed in the placement cavity 5.
[0051] by Figure 1 Taking the orientation shown as an example, the pre-filter 2 protrudes axially downward relative to the membrane filter 3. A placement cavity 5 for placing the scale inhibitor 4 is formed between the inner wall surface of the pre-filter 2, the bottom surface of the membrane filter 3, and the inner bottom surface of the housing 1. It can be understood that: a water inlet cavity 10 is formed between the pre-filter 2 and the inner wall of the housing 1. Water in the water inlet cavity 10 enters the interior of the pre-filter 2 through the outer peripheral wall of the pre-filter 2, is filtered, and then flows out through the inner peripheral wall of the pre-filter 2 to the scale inhibitor 4. The bottom surface of the membrane filter 3 is its water inlet end. Water flowing out of the scale inhibitor 4 flows into the interior of the membrane filter 3 through the bottom surface of the membrane filter 3, and then flows out through the water outlet end at the top of the membrane filter 3.
[0052] This arrangement creates an axial positional difference between the pre-filter element 2 and the membrane filter element 3, allowing the placement cavity 5 to be directly enclosed by the inner side of the end face of the housing 1. This results in a more compact and integrated overall structure for the pre-filter element 2, the scale inhibitor 4, and the membrane filter element 3.
[0053] like Figure 1As shown, in some embodiments, the composite filter element further includes a first end cap 6, which is connected to the pre-filter element 2 and can block the end face opening of the pre-filter element 2. The scale inhibitor 4 is disposed in the space between the first end cap 6 and the water inlet end of the membrane filter element 3. The first end cap 6 is used to carry the scale inhibitor 4.
[0054] By setting the first end cap 6, the scale inhibitor 4 can be installed on the first end cap 6. Compared with setting the scale inhibitor 4 inside the membrane filter element 3, the first end cap 6 provides a stable installation position for the scale inhibitor 4, making it more convenient to install the scale inhibitor 4. In addition, the first end cap 6 can effectively block the end face opening of the pre-filter element 2, thereby separating the inlet and outlet water of the pre-filter element 2 and restricting all the water flowing out from the inner peripheral wall of the pre-filter element 2 from flowing to the scale inhibitor 4.
[0055] like Figure 1 As shown, in some embodiments, the first end cap 6 includes an end wall 61 and a circumferential side wall 62, and an accommodating space is formed between the end wall 61 and the circumferential side wall 62. The pre-filter element 2 is partially located in the accommodating space, and a portion of the outer circumferential wall of the pre-filter element 2 is attached to the inner surface of the circumferential side wall 62. The scale inhibitor 4 is disposed in the space formed by the inner side of the pre-filter element 2, the water inlet end of the membrane filter element 3, and the inner surface of the end wall 61.
[0056] With this arrangement, part of the outer peripheral wall of the pre-filter element 2 is attached to the inner surface of the circumferential side wall 62, which not only makes the structure between the pre-filter element 2 and the first end cover 6 more compact, but also provides a certain limiting effect during assembly. Furthermore, the fitting arrangement eliminates gaps, thereby avoiding the water accumulation problem that may occur due to gaps.
[0057] Optionally, the first end cap 6 is sealed to the pre-filter element 2.
[0058] like Figure 1 As shown, in some embodiments, a positioning part 63 is provided on the inner surface of the end wall 61, the pre-filter element 2 is configured to be snapped between the positioning part 63 and the inner surface of the circumferential side wall 62, and the scale inhibitor 4 is configured to be located inside the positioning part 63.
[0059] With this configuration, the positioning part 63 can pre-position the pre-filter element 2 and the scale inhibitor 4, making it easy to quickly and accurately install the pre-filter element 2 and the scale inhibitor 4 into place.
[0060] Optionally, the cross-sectional shape of the positioning part 63 may include, but is not limited to, a triangle.
[0061] like Figure 1As shown, in some embodiments, the composite filter element further includes a second end cap 7. The second end cap 7 and the first end cap 6 are respectively disposed at the two ends of the axial direction of the pre-filter element 2. There is a water passage gap 20 between the inner peripheral wall of the pre-filter element 2 and the outer peripheral wall of the membrane filter element 3. The second end cap 7 is connected to the outer peripheral wall of the membrane filter element 3 and the pre-filter element 2. The second end cap 7 can block the end of the water passage gap 20 away from the first end cap 6.
[0062] By setting the second end cap 7, it can cooperate with the first end cap 6 to separate the inlet and outlet water of the pre-filter 2, ensuring that only water filtered by the pre-filter 2 can flow into the water passage gap 20, and that the water filtered by the pre-filter 2 flows along the water passage gap 20 to the placement chamber 5, and finally enters the scale inhibitor material 4.
[0063] Optionally, the second end cap 7 is sealed to the outer peripheral wall of the membrane filter element 3, and the second end cap 7 is sealed to the pre-filter element 2.
[0064] like Figure 1 As shown, in some embodiments, the water inlet 11, the pure water outlet 12, and the wastewater outlet 13 are all located on the same shell wall of the housing 1. This arrangement ensures that the inlet and outlet interfaces are all located on the same side, facilitating centralized planning of external pipeline routes, significantly improving the convenience of external pipeline connections, and reducing installation difficulty and space occupation.
[0065] like Figure 1 As shown, in some embodiments, the water outlet end of the membrane filter element 3 is connected to a third end cap 8, the third end cap 8 is connected to the housing 1, the pure water outlet 12 and the wastewater outlet 13 are located inside the third end cap 8, the water inlet 11 is located outside the third end cap 8, and a flow guiding cavity 30 is formed between the third end cap 8 and the inner wall of the housing 1. The water inlet 11, the flow guiding cavity 30 and the water inlet cavity 10 are connected.
[0066] The water to be filtered first flows into the guide cavity 30 from the inlet 11, and then smoothly transitions to the inlet cavity 10 through the guide cavity 30. The third end cap 8 can separate the water inlet of the inlet 11 from the water outlet of the membrane filter element 3, ensuring that the water flows in an orderly manner inside the housing 1 according to the preset path.
[0067] Optionally, the third end cap 8 is sealed to the housing 1, and the third end cap 8 is sealed to the membrane filter element 3.
[0068] Optionally, the pre-filter 2 includes a non-woven fabric layer, a PP cotton layer, a folded PP layer, and an activated carbon layer stacked sequentially. The non-woven fabric layer and the PP cotton layer first intercept large particles of impurities such as mud, sand, and rust; the folded PP layer further filters fine particles; and the activated carbon layer adsorbs odors and organic matter. This allows the pre-filter 2 to achieve multi-stage progressive filtration, laying a good foundation for subsequent scale inhibition and deep filtration.
[0069] Optionally, the membrane filter element 3 includes at least one of nanofiltration membrane and reverse osmosis membrane. It can perform deep filtration on water that has undergone pre-filtration and scale inhibition treatment, intercepting microorganisms, heavy metals, soluble salts and other fine impurities in the water, and significantly improving the purity of the purified water.
[0070] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.
Claims
1. A composite filter element, characterized in that, It includes a housing (1), and a pre-filter (2) and a membrane filter (3) disposed inside the housing (1). The pre-filter (2) is sleeved on the outer periphery of the membrane filter (3), and the pre-filter (2) and the inner wall of the housing (1) form a water inlet cavity (10). The housing (1) is provided with a water inlet (11) communicating with the water inlet cavity (10), a pure water outlet (12) communicating with the membrane filter (3), and a wastewater outlet (13). A scale inhibitor (4) is provided between the water outlet end of the pre-filter (2) and the water inlet end of the membrane filter (3).
2. The composite filter element according to claim 1, characterized in that, The inner side of the pre-filter (2), the water inlet end of the membrane filter (3), and the inner side of the end face of the housing (1) form a placement cavity (5), and the scale inhibitor (4) is disposed in the placement cavity (5).
3. The composite filter element according to claim 2, characterized in that, The composite filter element also includes a first end cap (6), which is connected to the pre-filter element (2) and can block the end face opening of the pre-filter element (2). The scale inhibitor (4) is disposed in the space between the first end cap (6) and the water inlet end of the membrane filter element (3). The first end cap (6) is used to carry the scale inhibitor (4).
4. The composite filter element according to claim 3, characterized in that, The first end cap (6) includes an end wall (61) and a circumferential side wall (62). An accommodating space is formed between the end wall (61) and the circumferential side wall (62). The pre-filter (2) is partially located in the accommodating space and part of the outer circumferential wall of the pre-filter (2) is attached to the inner surface of the circumferential side wall (62). The scale inhibitor (4) is disposed in the space formed by the inner side of the pre-filter (2), the water inlet end of the membrane filter (3), and the inner surface of the end wall (61).
5. The composite filter element according to claim 4, characterized in that, The inner surface of the end wall (61) is provided with a positioning part (63), the pre-filter (2) is configured to be snapped between the positioning part (63) and the inner surface of the circumferential side wall (62), and the scale inhibitor (4) is configured to be located inside the positioning part (63).
6. The composite filter element according to claim 3, characterized in that, The composite filter element also includes a second end cap (7), which is disposed at both ends of the axial direction of the pre-filter element (2) and the first end cap (6). There is a water passage gap (20) between the inner peripheral wall of the pre-filter element (2) and the outer peripheral wall of the membrane filter element (3). The second end cap (7) is connected to the outer peripheral wall of the membrane filter element (3) and the pre-filter element (2). The second end cap (7) can block the end of the water passage gap (20) away from the first end cap (6).
7. The composite filter element according to any one of claims 1 to 6, characterized in that, The water inlet (11), the pure water outlet (12), and the wastewater outlet (13) are all located on the same shell wall of the shell (1).
8. The composite filter element according to claim 7, characterized in that, The water outlet of the membrane filter element (3) is connected to a third end cap (8), which is connected to the housing (1). The pure water outlet (12) and the wastewater outlet (13) are located inside the third end cap (8), and the water inlet (11) is located outside the third end cap (8). A flow guide cavity (30) is formed between the third end cap (8) and the inner wall of the housing (1). The water inlet (11), the flow guide cavity (30), and the water inlet cavity (10) are connected.
9. The composite filter element according to any one of claims 1 to 6, characterized in that, The pre-filter (2) includes a non-woven fabric layer, a PP cotton layer, a paper PP layer and an activated carbon layer stacked in sequence; And / or, the membrane filter element (3) includes at least one of nanofiltration membrane and reverse osmosis membrane.
10. A water purification device, characterized in that, The composite filter element includes any one of claims 1 to 9.