A water purification filter element and water-using equipment

Abstract

This utility model relates to the field of water purification technology, and particularly to a water purification filter element and a water-using device. The water purification filter element includes a filter element body and upper and lower end caps respectively disposed at both ends of the filter element body. The upper end of the filter element body is inserted into an upper end cap slot on the upper end cap, and the lower end of the filter element body is inserted into a lower end cap slot on the lower end cap. The filter element body, radially from the inside to the outside, includes a supporting hydrophilic non-woven fabric layer, a purification layer, and a non-woven fabric covering layer. The supporting hydrophilic non-woven fabric layer has a hollow tubular structure, and its bending stiffness is greater than that of the non-woven fabric covering layer. The filtration accuracy of the supporting hydrophilic non-woven fabric layer increases progressively along the media flow direction. The water purification filter element of this utility model has better filtration efficiency and a longer service life.

Description

Technical Field

[0001] This utility model relates to the field of water purification technology, and in particular to a water purification filter element and a water-using device. Background Technology

[0002] To maintain structural stability, existing water purifier filter cartridges often use pure plastic as the internal support frame. (Refer to...) Figure 1 As shown; however, these plastic frames are highly susceptible to microplastic shedding during long-term use due to factors such as continuous water flow, changes in water pH, and material aging. These microplastic particles are extremely small and can directly enter the human body with drinking water. They are difficult for the digestive system to break down and excrete, and long-term accumulation may lead to various health risks: they may adsorb harmful substances such as heavy metals and organic pollutants in the water, acting as carriers to bring toxins into human cells; they may also irritate the digestive tract mucosa, causing inflammatory reactions, and even interfering with the human metabolic and endocrine systems. Although their short-term harms are not yet fully clear, they have already caused widespread concern among users about potential health risks, leading to a general psychological aversion to the presence of plastic impurities in drinking water, which is seen as violating the basic understanding of "clean drinking water," seriously affecting the product's user experience and acceptance.

[0003] For example, the "Activated Carbon Polyvinyl Alcohol Fiber Water Purification Filter Cartridge with High Flow Rate" (CN209033946U) uses a plastic core as its support structure. The plastic core has multiple permeable holes around its circumference and a water inlet hole in its center. This structure also presents the aforementioned health risks associated with microplastic shedding, and relies solely on the permeable holes for water flow, lacking additional filtration functionality. Furthermore, the poor hydrophilicity of the plastic material may affect water flow efficiency and the overall purification effect of the filter cartridge.

[0004] Furthermore, the high rigidity of traditional plastic frames results in a generally stiff filter element, making the end caps or filter media prone to damage during installation and replacement due to impacts. Additionally, the poor hydrophilicity of plastic materials increases flow resistance inside the frame, thus affecting filtration efficiency. Therefore, there is an urgent need for a new filter element structure that can meet support requirements while improving safety and user acceptance. Utility Model Content

[0005] To address the shortcomings of the existing technology, this utility model provides a water purification filter element and a water-using device.

[0006] In a first aspect, the present invention provides a water purification filter element, including a filter element body and an upper end cap and a lower end cap respectively disposed at both ends of the filter element body. The upper end of the filter element body is inserted into an upper end cap slot disposed on the upper end cap, and the lower end of the filter element body is inserted into a lower end cap slot disposed on the lower end cap. The filter element body comprises, from the inside to the outside, a supporting hydrophilic nonwoven fabric layer, a purification layer, and a nonwoven fabric covering layer in a radial direction; the supporting hydrophilic nonwoven fabric layer has a hollow tubular structure, and the bending stiffness of the supporting hydrophilic nonwoven fabric layer is greater than that of the nonwoven fabric covering layer. The filtration accuracy of the supporting hydrophilic nonwoven fabric layer increases progressively along the direction of media flow.

[0007] The water purification filter element provided by the first aspect of this utility model replaces the traditional PP plastic skeleton with a supportive hydrophilic non-woven fabric layer. Even if the non-woven fabric contains plastic components, its interwoven fiber structure greatly reduces the risk of microplastic shedding, reduces the possibility of plastic particles entering drinking water, alleviates users' concerns about health hazards, meets the cognitive needs of "clean drinking water", and improves user acceptance.

[0008] Moreover, compared to traditional PP plastic frames with permeable pores, this invention uses a supportive hydrophilic non-woven fabric layer, which not only ensures the stability of the filter element structure and resists water flow pressure and external installation forces, avoiding the collision damage problem caused by the excessive rigidity of traditional plastic frames; its hydrophilicity can also reduce water flow resistance, which is superior to the disadvantage of poor hydrophilicity of plastic frames and improves filtration efficiency. In addition, the filtration precision of the supporting hydrophilic nonwoven fabric layer increases step by step along the media flow direction. It can first intercept larger impurities and then finely filter small particles, achieving layered interception. This reduces the load on subsequent purification layers and avoids the problem of easy clogging in single-precision designs, thereby improving the overall filtration effect and extending the service life of the filter element. At the same time, it adds a pre-filtration function compared to plastic frames with only water permeable holes, enhancing the purification capacity.

[0009] In one embodiment of this utility model, the supporting hydrophilic nonwoven fabric layer includes an inner layer, a middle layer and an outer layer radially from the inside to the outside; The filtration accuracy of the inner layer is between 100μm and 300μm, the filtration accuracy of the middle layer is between 10μm and 100μm, and the filtration accuracy of the outer layer is between 1μm and 10μm.

[0010] In one embodiment of this utility model, the supporting hydrophilic nonwoven fabric layer is a hollow tubular structure formed by heat setting of wound wet nonwoven fabric.

[0011] In one embodiment of this utility model, the basis weight of the wet-laid nonwoven fabric is between 15 g / m². 2 Up to 80g / m 2 between.

[0012] In one embodiment of this utility model, the thickness of the supporting hydrophilic nonwoven fabric layer is between 0.1 mm and 5 mm.

[0013] In one embodiment of this utility model, the diameter of the water purification channel formed by the hollow tubular structure is between 10mm and 30mm.

[0014] In one embodiment of this utility model, the basis weight of the nonwoven fabric coating is between 10 g / m². 2 Up to 30g / m 2 Between; and / or The thickness of the nonwoven fabric coating is between 0.05 mm and 0.3 mm.

[0015] In one embodiment of this utility model, the ratio of the bending stiffness of the supporting hydrophilic nonwoven fabric layer to the nonwoven fabric covering layer is (3-5):1; Preferably, the flexural stiffness of the supporting hydrophilic nonwoven fabric layer, as determined by ISO 9073-7:2024, is between 50 N·mm. 2 Up to 150 N·mm 2 The flexural stiffness of the nonwoven fabric covering is between 10 N·mm. 2 Up to 40 N·mm 2 between.

[0016] In one embodiment of this utility model, the filter material of the purification layer includes activated carbon; Preferably, the activated carbon is columnar activated carbon or powdered activated carbon, with a packing density of 0.3-0.8 g / cm³. 3 .

[0017] Secondly, this utility model provides a water-using device equipped with a water purification filter element as described in the first aspect.

[0018] Other features and beneficial effects of this invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objectives and other beneficial effects of this invention can be realized and obtained through the structures particularly pointed out in the description, claims, and drawings. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Unless otherwise specified, the positional relationships shown in the drawings in the following description are based on the direction in which the components are drawn in the figure.

[0020] Figure 1 The diagram shown is an exploded view of a water filter cartridge made of a plastic frame in the prior art. Figure 2 The diagram shown is a schematic diagram of the external structure of the water purification filter element according to the first embodiment of this utility model. Figure 3 The figure shown is a cross-sectional view of the water purification filter element according to the first embodiment of this utility model. Figure 4 The figure shown is an exploded view of the water purification filter element of the first embodiment of this utility model.

[0021] Figure label: 10. Filter cartridge body; 11. Supporting hydrophilic non-woven fabric layer; 12. Purification layer; 13. Non-woven fabric covering layer; 14. Water purification channel; 21. Top cover; 22. Bottom cover. Detailed Implementation

[0022] In the description of this utility model, it should be noted that all terms used in this utility model (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model pertains, and should not be construed as limiting this utility model; it should be further understood that the terms used in this utility model should be understood to have the same meaning as those in the context of this specification and in the relevant field, and should not be understood in an idealized or overly formal sense, except as expressly defined in this utility model.

[0023] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0024] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0025] 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.

[0026] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to 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.

[0027] Please refer to Figure 2 The first embodiment of this utility model provides a water purification filter element, including a filter element body 10 and end caps. The filter element body 10 includes an upper end and a lower end opposite to the upper end. An upper end cap 21 and a lower end cap 22 are respectively provided at the upper and lower ends of the filter element body 10. The upper end cap 21 has an inner slot adapted to the upper end of the filter element body 10, and the lower end cap 22 also has an inner slot adapted to the lower end of the filter element body 10. The upper and lower ends of the filter element body 10 are tightly inserted into their corresponding slots. This connection method not only ensures the convenience of installing and replacing the filter element, but also effectively guarantees the sealing between the filter element body 10 and the end caps, preventing leakage of unfiltered water and ensuring the filtration effect.

[0028] The material of the end cap can be selected according to different application scenarios. For example, food-grade PP and PC plastics are preferred for household water purification equipment because they are low in cost and meet food contact safety standards, satisfying daily use needs. Copper alloy or GF / PP composite materials can be used for catering equipment, which have both antibacterial properties and temperature and corrosion resistance, making them suitable for frequent operation scenarios. Titanium alloy or carbon fiber composite materials are selected for outdoor and special environments because they have excellent corrosion resistance and stability. 316 stainless steel or PTFE plastic is suitable for industrial and laboratory equipment because it is resistant to chemical corrosion and has high cleanliness, ensuring filtration accuracy.

[0029] In this embodiment, please also refer to Figures 2 to 4 The filter body 10 includes, from the inside to the outside, a supporting hydrophilic nonwoven fabric layer 11, a purification layer 12 and a nonwoven fabric covering layer 13 in a radial direction; In this embodiment, the supporting hydrophilic nonwoven fabric layer 11 can be formed by heat-setting a wound wet-laid nonwoven fabric to create a hollow tubular structure. The diameter of the water purification channel 14 formed by the hollow tubular structure is between 10mm and 30mm, such as 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, 22mm, 24mm, 26mm, 28mm, 30mm, etc., but is not limited to the listed values; other unlisted values ​​within this range are also applicable.

[0030] It should be noted that the cross-section of the water purification channel 14 formed by the hollow tubular structure can be circular, elliptical or polygonal, and those skilled in the art can make adaptive designs according to their needs.

[0031] The preparation process includes, but is not limited to: dispersing fibers in an aqueous medium to form a slurry, forming it through a screen, vacuum dehydrating it, and hot air drying (temperature 100-120℃) to produce a nonwoven fabric; then winding the nonwoven fabric into a tube shape and heat-setting it (temperature, for example, 80-150℃) to maintain structural stability and ensure that the tube shape is not easily deformed; thus, the bending stiffness of the supporting hydrophilic nonwoven fabric layer 11 is higher than that of the hollow tube formed by winding the nonwoven fabric before heat setting.

[0032] It should be noted that the hydrophilic nonwoven fabric can be a commercially available hydrophilic nonwoven fabric, or it can be made of polypropylene (PP), polyester (PET), or viscose / PP composite fiber as the base material, and the base material is given hydrophilicity. The methods of giving hydrophilicity include, but are not limited to, chemical modification and physical modification. Chemical modification can be to introduce hydroxyl (-OH) or carboxyl (-COOH) groups on the fiber surface through graft copolymerization, such as using maleic anhydride grafted onto PP fiber. Physical modification can be to coat a hydrophilic agent, which adheres to the fiber surface through intermolecular forces to improve wettability. Those skilled in the art can make adaptive choices based on existing technology, which will not be elaborated further.

[0033] Preferably, the basis weight of the wet-laid nonwoven fabric is between 15 g / m². 2 Up to 80g / m 2 Between, for example, 15g / m 2 20g / m 2 25g / m 2 30g / m 2 35g / m 2 40g / m 2 45g / m 2 50g / m 2 55g / m 2 60g / m 2 65g / m 2 70g / m2 75g / m 2 80g / m 2 Such values ​​are not limited to those listed; other unlisted values ​​within this range also apply. If the basis weight of the wet nonwoven fabric is too low, the support stiffness will be insufficient, and if it is too high, the water flow resistance will be too high. Therefore, controlling it within this range can better ensure that the supporting hydrophilic nonwoven fabric layer 11 can maintain the tubular structure without hindering the flow of water.

[0034] Preferably, the thickness of the supporting hydrophilic nonwoven fabric layer 11 is between 0.1 mm and 5 mm, such as 0.1 mm, 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, etc., but is not limited to the listed values. Other unlisted values ​​within this range are also applicable. Controlling the thickness within this range can provide sufficient structural strength to resist water flow pressure (avoiding deformation) and can form an effective filtration or support base through a reasonable number of fiber layers. This avoids material waste and increased water flow resistance due to excessive thickness, or support failure due to excessive thinness.

[0035] In this embodiment, the filter material of the purification layer 12 includes activated carbon. Activated carbon has abundant pores and can efficiently adsorb organic pollutants, odors, residual chlorine and some heavy metals in water. It complements the physical filtration of the supporting hydrophilic non-woven fabric layer 11, which can deeply purify water quality, improve the taste of drinking water, reduce subsequent filter material pollution and extend the overall filter life.

[0036] Preferably, the activated carbon is columnar activated carbon or powdered activated carbon. Columnar activated carbon has a robust structure and regular shape, making it less prone to breakage or loss with water flow. It is suitable for long-term use and can maintain the stability of the purification layer 12, reducing filter material wear and the risk of secondary pollution. Powdered activated carbon has a large specific surface area and many adsorption sites, resulting in a faster adsorption rate and higher capacity for organic matter and odors in water, and better purification efficiency. It is suitable for scenarios that require rapid improvement of water quality. Preferably, their filling density is 0.3-0.8 g / cm³. 3 For example, 0.3g / cm 3 0.4g / cm 3 0.5g / cm 3 0.6g / cm 3 0.7g / cm 3 0.8g / cm 3 This applies to, but is not limited to, the listed values; other unlisted values ​​within this range also apply.

[0037] As a preferred example of this embodiment, the activated carbon is modified activated carbon; specifically, the functional groups on the surface of the activated carbon are adjusted by acid treatment (such as nitric acid) or alkali treatment (such as sodium hydroxide) (e.g., adding carboxyl groups and hydroxyl groups) to improve the adsorption selectivity for specific pollutants (such as heavy metal ions and polar organic compounds).

[0038] As a preferred example of this embodiment, the activated carbon is activated carbon fiber. Compared with traditional granular activated carbon, activated carbon fiber (ACF) has a finer fiber diameter and a larger specific surface area, resulting in a faster adsorption rate, which can shorten the contact time between water flow and filter media and significantly improve adsorption efficiency.

[0039] As a preferred example of this embodiment, activated carbon with different properties can be used in a gradient filling along the water flow direction. For example, the pore size of the activated carbon gradually decreases along the medium flow direction. Specifically, large-pore activated carbon is used near the water inlet side to preferentially adsorb large molecular organic matter and particulate matter; small-pore activated carbon is used near the water outlet side to deeply adsorb small molecular pollutants, thereby achieving graded purification of "coarse adsorption + fine adsorption" and improving the overall adsorption capacity.

[0040] As a preferred example of this embodiment, the filter layer includes an activated carbon fiber layer and an ultrafiltration membrane layer in the radial direction from the inside to the outside. With this composite structure design, since the activated carbon fiber layer is close to the supporting hydrophilic nonwoven fabric layer 11, it can preferentially and quickly adsorb organic matter, odors, etc. in the water, avoiding their contamination of the ultrafiltration membrane. The ultrafiltration membrane layer intercepts microorganisms, colloids, etc., forming a functional layer of "adsorption + sieving", which makes the purification effect more comprehensive, reduces organic pollution of the ultrafiltration membrane and pore blockage of activated carbon fibers, extends the overall lifespan, reduces mutual interference of pollutants, and improves filtration efficiency.

[0041] As a preferred example of this embodiment, the purification layer 12 may be formed by heating and bonding activated carbon particles and polyvinyl alcohol fiber columnar particles with an inorganic adhesive.

[0042] In this embodiment, the nonwoven fabric covering 13 can be made of common materials used for the outer layer of filter elements, such as PP spunbond nonwoven fabric or PET meltblown nonwoven fabric, which will not be described in detail here.

[0043] Preferably, the basis weight of the nonwoven fabric covering 13 is between 10 g / m². 2 Up to 30g / m 2 Between, for example, 10g / m 2 12g / m 2 14g / m 2 16g / m 2 18g / m 2 20g / m 2 22g / m 2 24g / m2 26g / m 2 28g / m 2 30g / m 2 This applies to, but not limited to, the listed values; other unlisted values ​​within this range also apply. Preferably, the thickness of the nonwoven fabric covering 13 is between 0.05 mm and 0.3 mm, such as 0.05 mm, 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, 0.3 mm, etc., but is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0044] By controlling the weight and thickness of the nonwoven fabric cover 13 to a relatively low level, the cover can have a certain degree of flexibility, which can tightly wrap the filter material (such as activated carbon) of the purification layer 12 and prevent filter material leakage; it can also avoid the increase in water flow resistance caused by excessive thickness, while reducing material costs and improving the overall lightweight level of the filter element.

[0045] In this embodiment, the bending stiffness of the supporting hydrophilic nonwoven fabric layer 11 is greater than that of the nonwoven fabric cover layer 13. The greater bending stiffness of the supporting hydrophilic nonwoven fabric layer 11 ensures that, as the inner skeleton of the filter element, it can withstand water flow pressure and external impacts during installation, maintaining the stability of the hollow tubular structure and preventing deformation and blockage of the water flow channels. Conversely, the lower stiffness of the nonwoven fabric cover layer 13 provides flexibility, allowing it to tightly wrap the filter layer to prevent filter media leakage and reducing the overall brittleness of the filter element, thus lowering the risk of collision damage during installation and replacement. This matching stiffness achieves a synergistic optimization of support stability and structural protection.

[0046] Preferably, the ratio of the bending stiffness of the supporting hydrophilic nonwoven fabric layer 11 to the nonwoven fabric covering layer 13 is (3-5):1, for example, 3:1, 3.5:1, 4:1, 4.5:1, 5:1, etc., but it is not limited to the listed values. Other unlisted values ​​within this range are also applicable. More preferably, the flexural stiffness of the supporting hydrophilic nonwoven layer 11, as measured according to ISO 9073-7:2024, is between 50 N·mm. 2 Up to 150 N·mm 2 Between, for example, 50 N·mm 2 60 N·mm 2 70 N·mm 2 80 N·mm 2 90 N·mm 2 100N·mm 2 110 N·mm 2 120N·mm 2 130 N·mm 2140 N·mm 2 150 N·mm 2 The values ​​are not limited to those listed; other unlisted values ​​within this range also apply. The flexural stiffness of the nonwoven fabric covering 13 is between 10 N·mm. 2 Up to 40 N·mm 2 Between, for example, 10 N·mm 2 15N·mm 2 20N·mm 2 25 N·mm 2 30N·mm 2 35 N·mm 2 40 N·mm 2 This applies to, but is not limited to, the listed values; other unlisted values ​​within this range also apply.

[0047] The second embodiment of this utility model provides a water purification filter element. The difference between this embodiment and the first embodiment is that the filtration accuracy of the supporting hydrophilic nonwoven fabric layer 11 increases step by step along the medium flow direction.

[0048] In this embodiment, the supporting hydrophilic nonwoven fabric layer 11 includes an inner layer, a middle layer and an outer layer from the inside to the outside in the radial direction; Preferably, the filtration accuracy of the inner layer is between 100μm and 300μm, such as 100μm, 120μm, 140μm, 160μm, 180μm, 200μm, 220μm, 240μm, 260μm, 280μm, 300μm, etc., but is not limited to the listed values. Other unlisted values ​​within this range are also applicable. Preferably, the filtration accuracy of the intermediate layer is between 10 μm and 100 μm, and the filtration accuracy of the outer layer is between 1 μm and 10 μm. The filtration accuracy of the intermediate layer is between 10 μm and 100 μm, for example, 10 μm, 20 μm, 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, etc., but is not limited to the listed values; other unlisted values ​​within this range are also applicable. Preferably, the filtration accuracy of the outer layer is between 1μm and 10μm, such as 1μm, 2μm, 3μm, 4μm, 5μm, 6μm, 7μm, 8μm, 9μm, 10μm, etc., but is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0049] The supporting hydrophilic nonwoven fabric layer 11 adopts a gradient design of filtration precision, with an inner layer (100μm-300μm), a middle layer (10μm-100μm), and an outer layer (1μm-10μm). This allows for graded interception, specifically as follows: large particles such as silt are first intercepted by the inner layer, medium-sized impurities such as colloids are filtered by the middle layer, and finally, fine particles are captured by the outer layer. This avoids the failure of a single precision layer due to rapid clogging by large particles. Each layer has a clear function, which can reduce the contamination of the subsequent purification layer 12, extend the overall filter life, and make the water flow resistance more uniform, ensuring stable water flow and improving purification efficiency.

[0050] The second embodiment of this utility model adopts a supportive hydrophilic non-woven fabric layer 11 with progressively increasing filtration precision along the medium flow direction. This allows for the interception of larger impurities first, followed by fine filtration of smaller particles, achieving layered interception. This reduces the load on the subsequent purification layer 12 and avoids the problem of easy clogging in a single precision design, thereby improving the overall filtration effect and extending the service life of the filter element. At the same time, it adds a pre-filtration function compared to a plastic frame with only water permeable holes, enhancing the purification capacity.

[0051] The following describes the water-using equipment according to an embodiment of the present invention.

[0052] A water-using device according to an embodiment of the present utility model includes a housing, a water inlet interface, a water outlet interface, and a filter cartridge compartment. The filter cartridge compartment is provided inside the housing, and the two ends of the filter cartridge compartment correspond to the water inlet interface (connecting to the water inlet end of the filter cartridge) and the water outlet interface (connecting to the water outlet end of the filter cartridge), respectively.

[0053] The water purification filter cartridge is installed inside the filter cartridge compartment. Its upper end cover is inserted into the water inlet port at the top of the compartment, and its lower end cover is inserted into the water outlet port at the bottom of the compartment. Water flows into the hollow channel of the filter cartridge from the water inlet port. After pre-filtration by the supporting hydrophilic non-woven fabric layer and deep purification by the filter layer, it flows out through the non-woven fabric cover to the water outlet port, completing the purification process.

[0054] It should be noted that the water-using equipment can also be a commercial coffee machine, an outdoor water purifier, etc., and those skilled in the art can make adaptive matching settings according to their needs.

[0055] Furthermore, those skilled in the art should understand that although many problems exist in the prior art, each embodiment or technical solution of this utility model can be improved in only one or a few aspects, without necessarily solving all the technical problems listed in the prior art or background art simultaneously. Those skilled in the art should understand that any content not mentioned in a claim should not be construed as a limitation on that claim.

[0056] Although this document frequently uses terms such as filter body, supporting hydrophilic nonwoven fabric layer, purification layer, nonwoven fabric covering, water purification channel, upper end cap, and lower end cap, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any kind of additional limitation would contradict the spirit of this utility model. The terms "first," "second," etc. (if present) in the description, claims, and accompanying drawings of the embodiments of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A water purification filter element, characterized in that, The filter element body includes an upper end cap and a lower end cap respectively disposed at both ends of the filter element body. The upper end of the filter element body is inserted into the upper end cap slot provided on the upper end cap, and the lower end of the filter element body is inserted into the lower end cap slot provided on the lower end cap. The filter element body comprises, from the inside to the outside, a supporting hydrophilic nonwoven fabric layer, a purification layer, and a nonwoven fabric covering layer in a radial direction; the supporting hydrophilic nonwoven fabric layer has a hollow tubular structure, and the bending stiffness of the supporting hydrophilic nonwoven fabric layer is greater than that of the nonwoven fabric covering layer. The filtration accuracy of the supporting hydrophilic nonwoven fabric layer increases progressively along the direction of media flow.

2. The water purification filter element according to claim 1, characterized in that, The supporting hydrophilic nonwoven fabric layer includes an inner layer, a middle layer and an outer layer from the inside to the outside in the radial direction; The filtration accuracy of the inner layer is between 100μm and 300μm, the filtration accuracy of the middle layer is between 10μm and 100μm, and the filtration accuracy of the outer layer is between 1μm and 10μm.

3. The water purification filter element according to claim 1, characterized in that, The supporting hydrophilic nonwoven layer is a hollow tubular structure formed by heat setting of wound wet nonwoven fabric.

4. The water purification filter element according to claim 3, characterized in that, The wet nonwoven fabric has a grammage of between 15 g / m 2 and 80 g / m 2 .

5. The water purification filter element according to claim 1, characterized in that, The thickness of the supporting hydrophilic nonwoven layer is between 0.1 mm and 5 mm.

6. The water purification filter element according to claim 1, characterized in that, The diameter of the water purification channel formed by the hollow tubular structure is between 10mm and 30mm.

7. The water purification filter element according to claim 1, characterized in that, The nonwoven fabric coating has a grammage comprised between 10 g / m 2 and 30 g / m 2 ; and / or The thickness of the nonwoven fabric coating is between 0.05 mm and 0.3 mm.

8. The water purification filter element according to claim 1, characterized in that, The ratio of the flexural stiffness of the supporting hydrophilic nonwoven fabric layer to the nonwoven fabric covering layer is (3-5):

1.

9. The water purification filter element according to claim 8, characterized in that, The bending stiffness of the supporting hydrophilic nonwoven layer is between 50 N mm 2 and 150 N mm 2 , the bending stiffness of the nonwoven coating is between 10 N mm 2 and 40 N mm 2 .

10. The water purification filter element according to claim 1, characterized in that, The filter material of the purification layer includes activated carbon.

11. The water purification filter element according to claim 10, characterized in that, The activated carbon is columnar activated carbon or powder activated carbon, and the packing density is 0.3-0.8 g / cm 3 .

12. A water-using device, characterized in that, The water purification filter element is provided as described in any one of claims 1-11.

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