Shower filter element

Abstract

The invention relates to the field of filtration, in particular to a shower filter element which comprises a filter assembly, an upper end cover and a lower end cover, the upper end cover and the lower end cover are detachably located at the two ends of the filter assembly, and the filter assembly sequentially comprises a first-stage filter element composite layer, a second-stage filter element composite layer and a third-stage filter element part from outside to inside. The first-stage filter element composite layer sequentially comprises an inner supporting layer, at least one micron-stage filter layer and an outer supporting layer from inside to outside, the second-stage filter element composite layer sequentially comprises a supporting filter layer and a composite carbon fiber layer from inside to outside, and the third-stage filter element part comprises a filter container and a filter material contained in the filter container. The first-stage filter element composite layer can be repeatedly folded into a wave shape and then encircles a circle along the side surface of the wrapping filter layer, and the upper end cover and the lower end cover are provided with clamping grooves, filter screens and the like. According to the water purifier, the effects that impurities in water are effectively filtered, the filtering effect and efficiency are improved, the filter element part is convenient to disassemble and replace, and the use convenience and economical efficiency are improved are achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of shower filter cartridges, and more particularly to a shower filter cartridge. BACKGROUND

[0002] The shower filter cartridge can filter impurities, prevent impurities from entering the shower nozzle, block the nozzle, and affect the smoothness of water flow, thereby ensuring the normal spraying of water flow and improving the comfort of bathing. At the same time, it can purify water quality, and the filtered water is purer and milder, reducing the irritation to the skin and reducing the symptoms of dry skin, itching, and allergy.

[0003] At present, the shower filter cartridge is mainly designed to be compact in whole, small in space occupation, and convenient to install. During use, the filter module can be connected between the shower and the hose after they are separated, which is simple to operate and can be easily replaced by anyone, thereby facilitating the use of users in different places.

[0004] However, the small shower filter cartridge has exposed many problems in actual use. The first problem is that the filter cartridge is easily blocked. Due to the limited internal space, the filtering area and impurity capacity of the filter cartridge are limited. During the filtering process, impurities quickly accumulate, causing the pores of the filter cartridge to be blocked. This increases the resistance of water flow when passing through, and the water flow is not smooth, which affects the bathing experience, and even the shower may not work normally due to serious blockage of the filter cartridge, interrupting the bathing process.

[0005] The frequently blocked filter cartridge needs to be replaced regularly by the user. On the one hand, this increases the use cost, and the user needs to constantly purchase new filter cartridges to maintain the normal operation of the shower. On the other hand, although the operation of replacing the filter cartridge is simple, the long-term accumulation will also bring inconvenience to the user. In addition, if the operation is not proper when replacing the filter cartridge, the sealing performance of the connection part of the shower may be damaged, causing a water leakage problem, which further affects the normal use of the shower. From the use effect, the blocked filter cartridge has a reduced filtering efficiency and cannot fully purify the water quality, so that part of the impurities may still enter the nozzle to block the nozzle, damage the structure of the nozzle, and shorten the service life of the shower. SUMMARY

[0006] In order to solve the problems of the existing small shower filter cartridge, such as easy blockage, high maintenance cost, and short service life, the present application provides a shower filter cartridge.

[0007] In a first aspect, the present application provides a shower filter cartridge, which adopts the following technical solution: A shower filter cartridge, comprising a filter assembly and upper and lower end covers located at both ends of the filter assembly, wherein the upper and lower end covers are detachably connected with the filter assembly. The filter assembly comprises, from outside to inside, a first-stage filter core composite layer, a second-stage filter core composite layer, and a third-stage filter core component, the third-stage filter core component comprising a filter container and filter material installed in the filter container; The second-stage filter core composite layer comprises, from inside to outside, a support filter layer and a composite carbon fiber layer, the composite carbon fiber layer comprising a carbon fiber layer and a wrapping filter layer wrapped on the surface of the carbon fiber layer, and the support filter layer is in a cylindrical structure in which the filter container is placed; The first-stage filter core composite layer comprises, from inside to outside, an inner support layer, at least one micron-level filter layer, and an outer support layer, and the inner support layer is arranged around the composite carbon fiber layer.

[0008] Preferably, the micron-level filter layer is a micron-level melt-blown cloth filter layer, and specifically, it can be 10-micron, 15-micron, 16-micron, 17-micron, 18-micron, 19-micron, 20-micron, 21-micron, 22-micron, 23-micron, 24-micron, 25-micron, 26-micron, 27-micron, 28-micron, 29-micron, or 30-micron.

[0009] Preferably, the micron-level filter layer is composed of a 15-micron melt-blown cloth filter layer and a 30-micron melt-blown cloth filter layer.

[0010] Preferably, the micron-level filter layer is composed of a 10-micron melt-blown cloth filter layer and a 20-micron melt-blown cloth filter layer.

[0011] Preferably, the micron-level filter layer is composed of a 10-micron melt-blown cloth filter layer, a 17-micron melt-blown cloth filter layer, and a 20-micron melt-blown cloth filter layer.

[0012] By adopting the above technical solution, the problems of easy clogging, high maintenance cost, and short service life of the existing small filter core can be effectively solved. The second-stage support filter layer is in a cylindrical structure in which the filter container is placed, and the first stage comprises inner and outer support layers and multiple micron-level filter layers, which cleverly increases the filter area and impurity capacity inside the filter core. Compared with the traditional small filter core, the same volume can accommodate more impurities, prolonging the use time of the filter core between two replacements and reducing the situation of poor water flow or even interrupted bathing caused by clogging.

[0013] The micrometer-level filter layer in the first-stage filter core composite layer can first intercept larger particulate impurities such as silt and rust, reducing the filtration pressure on the subsequent filter layers. The composite carbon fiber layer in the second-stage filter core composite layer adsorbs soluble impurities and odors, and the wrapped filter layer can further block fine impurities. The filtration material in the third-stage filter core component can finely filter the remaining tiny substances. This hierarchical filtration and dispersion of impurities can prevent a single filter layer from being clogged by a large amount of impurities in a short period of time, thereby reducing the overall risk of filter core clogging, ensuring smooth water flow, and maintaining a good bathing experience. The water flow will not become small or interrupted due to filter core clogging. By dispersing impurities through multiple layers of filtration, the filtration efficiency is greatly improved, and the problem of impurities clogging the filter core is reduced.

[0014] The first-stage filter core composite layer has at least one micrometer-level filter layer, and the arrangement of the outer support layer and the inner support layer expands the filtration space. The support filter layer in the second-stage filter core composite layer is cylindrical, and the filtration container in the third-stage filter core component is placed inside. This multi-layer structure design significantly increases the total filtration area and impurity capacity compared to traditional small-space single filter layers, prolongs the service life of the filter core, and reduces the frequency of clogging. Traditional small-space filter cores need to be replaced every 1-2 months due to clogging, while this new filter core needs to be replaced only every 7-20 months.

[0015] The overall design in this application retains the advantages of compactness, small space occupation, and easy installation. The filtration assembly is detachably connected to the upper and lower end covers, and users can easily disassemble and clean or partially replace the filter core. For some filter layers that are not completely clogged and can be cleaned and restored, such as the support filter layer and part of the micrometer-level filter layer, they can continue to be used after cleaning, reducing the frequency and cost of replacing the entire filter core.

[0016] Preferably, the first-stage filter core composite layer is repeatedly folded into a wave shape and then surrounds a circle along the side surface of the wrapped filter layer.

[0017] By adopting the above technical solution, the wave-shaped folding structure greatly increases the filtration area of the first-stage filter core composite layer. This allows the water flow to contact more filtration material in the same volume space, thereby improving the interception ability of impurities and enhancing the filtration effect.

[0018] The wave-shaped structure after folding makes the water flow form a longer and more complex path when passing through the first-stage filter core. This helps to slow down the water flow speed, prolong the contact time between water and filtration material, and make it easier for impurities to be captured and adsorbed by the filtration material, thereby improving the filtration precision and effectively removing particulate matter, colloids, and other impurities in the water.

[0019] Preferably, the thickness of the support filter layer is 1-5 mm, and the thickness of the composite carbon fiber layer is 15-25 mm.

[0020] By adopting the technical scheme, the thickness of the support filter layer is optimized, stable support is provided for the composite carbon fiber layer, the structural integrity is maintained, uniform water flow is ensured, and the filtering efficiency is improved. Under the impact of water flow and the extrusion of impurities, the support filter layer is not easy to deform or be damaged, and the filtering effect is stable. Optimizing the thickness of the composite carbon fiber layer can accommodate more impurities, prolong the service life of the filter core, reduce the replacement frequency, and reduce the use cost. At the same time, sufficient space enables the carbon fiber to fully contact with the water flow, so as to play the adsorption performance and improve the stability of the filtering effect.

[0021] By reasonable thickness matching of the support filter layer and the composite carbon fiber layer, a multi-stage filtering barrier is formed to jointly intercept and adsorb impurities of different particle sizes and properties, improve the filtering precision and efficiency, and ensure that the filter core is not easy to be blocked and the service life is prolonged.

[0022] Preferably, the inner support layer and the wrapped filter layer are non-woven fabric layers with a grammage of 30-90 g / m 2 , and the outer support layer is a non-woven fabric layer with a grammage of 30-60 g / m 2 .

[0023] By adopting the technical scheme, the non-woven fabric layer with a grammage of 30-90 g / m 2 has a certain strength and stiffness, can provide stable support for the internal filtering structure, prevent it from deforming under the impact of water flow or the extrusion of impurities, and ensure the smoothness of the filtering channel. At the same time, the non-woven fabric layer with the grammage in the range has appropriate pore size and filtering precision, can effectively intercept impurities within a certain particle size range, and plays a role in preliminary filtering, reducing the burden of subsequent filtering layers.

[0024] The non-woven fabric layer with a grammage of 30-60 g / m 2 is relatively light and will not significantly increase the weight of the entire filter core, facilitating installation and use. At the same time, it has a certain strength and toughness, can effectively protect the internal filtering structure, resist external mechanical pressure and friction, and prevent the filter core from being damaged during installation, use or replacement. The appropriate pore size and permeability of the outer support layer can guide the water flow to enter the filter core uniformly, so that the water flow can fully contact with each layer of filtering material, improve the uniformity and consistency of the filtering effect. It can also prevent external large impurities from directly impacting the internal filter layer, avoiding the local filter layer from being blocked or damaged too early due to bearing too much pressure.

[0025] The inner support layer, the wrapped filter layer and the outer support layer cooperate with other filter layers (such as micron filter layers, composite carbon fiber layers, etc.) to form a complete filtration system. According to the position and functional characteristics, each layer filters, adsorbs and intercepts the water flow in turn, realizes efficient removal of impurities with different particle sizes and properties in the water, and improves the water quality. The reasonable matching and synergistic effect of each support layer and filter layer make the filter core not easy to be blocked during use, the filtration performance is more stable and durable, thereby prolonging the service life of the filter core, reducing the replacement frequency and reducing the use cost.

[0026] Preferably, the support filter layer is a PP cotton rod filter layer.

[0027] By adopting the above technical scheme, the structure of the PP cotton rod filter layer is uniform, which can make the water flow more uniformly distributed on the cross section of the entire filter core when passing through, avoid the local water flow being too concentrated to cause uneven blockage of the filter layer, thereby improving the overall filtration effect and service life of the filter core. At the same time, the PP cotton rod filter layer has high porosity and good filtration precision, which can effectively intercept larger particulate impurities in the water, such as silt, rust, scale, etc., and play a role in preliminary filtration, reducing the burden of subsequent filter layers.

[0028] In addition, as a support filter layer, the PP cotton rod filter layer can effectively protect the subsequent filter layers such as composite carbon fiber layers, prevent them from being directly impacted by the water flow and impurities, prolong the service life of the subsequent filter layers, and improve the filtration effect and stability of the entire filter core.

[0029] Preferably, the filter material is KDF material.

[0030] By adopting the above technical scheme, the KDF material can efficiently remove heavy metals such as lead and mercury in water, reduce the content of heavy metals in water, ensure the safety of bathing water, and reduce the risk of skin absorbing harmful substances. At the same time, it can also reduce the hardness of water, reduce the scaling of calcium and magnesium ions, keep the nozzle unblocked, and prolong the service life of the shower. The use of KDF material reduces the burden of subsequent filter layers, prolongs the filter core replacement cycle, and reduces the use cost.

[0031] Preferably, the upper end cover and the lower end cover are provided with clamping grooves, and the filter assembly can be inserted into the clamping grooves at both ends; The bottom of the clamping groove of the lower end cover is provided with a filter screen; The bottom of the upper end cover is provided with a clamping column.

[0032] Preferably, the filter screen is a stainless steel filter screen, a plastic filter screen, a glass filter screen or a ceramic filter screen.

[0033] By adopting the technical scheme, the clamping groove design makes the installation and dismounting of the filter assembly not need complicated tools or tedious operation, and a user can easily insert the filter assembly into the clamping groove to complete the installation or take it out for replacement or maintenance, which is convenient and fast and reduces the use difficulty. The filter screen can block part of large-particle impurities from entering the inside of the filter assembly, reduce the burden of the internal filter material, slow down the clogging and loss speed of the internal filter material, thereby prolonging the service life of the whole filter core and reducing the replacement frequency and use cost.

[0034] Preferably, the preparation method of the composite carbon fiber layer comprises the following steps: 1) mixing carbon fibers and a solvent at a mass ratio of 1:(7-8), and then crushing to obtain a suspension; 2) adding diatomite, sodium carboxymethyl cellulose, polyethylene glycol, a surfactant, a lead removal aid, a chlorine amine removal aid, and an antibacterial agent into the suspension to obtain a slurry, and then performing dehydration and drying treatment on the slurry after wet forming to obtain a carbon fiber layer; 3) wrapping a wrapping filter layer on the surface of the carbon fiber layer to obtain a composite carbon fiber layer.

[0035] Preferably, the lead removal aid comprises at least one of iron, zinc, KDF, and copper.

[0036] Preferably, the chlorine amine removal aid comprises at least one of iron oxide, calcium sulfite, sodium sulfite, and sodium thiosulfate. Preferably, the amount of diatomite is 5-15% of the weight of the carbon fibers, the amount of sodium carboxymethyl cellulose is 1-5% of the weight of the carbon fibers, the amount of polyethylene glycol is 1-3% of the weight of the carbon fibers, the amount of the surfactant is 0.1-1% of the weight of the carbon fibers, the amount of the lead removal aid is 1-1.5% of the weight of the carbon fibers, the amount of the chlorine amine removal aid is 1-1.5% of the weight of the carbon fibers, and the amount of the antibacterial agent is 1-2% of the weight of the carbon fibers.

[0037] By adopting the technical scheme, the carbon fibers are crushed and adjusted to a specific particle size, so that the specific surface area is increased, the subsequent mixing with other substances can be more fully dispersed, the adsorption capacity for small molecular impurities, organic matters, heavy metal ions, etc. is improved, and more efficient water quality purification is achieved. The addition of diatomite and other ingredients in the slurry improves the formability and filtration performance of the slurry. The wet forming, dehydration, drying, and other processes make the carbon fiber layer structure more dense and the pore size distribution more uniform, thereby effectively intercepting smaller particle size impurities, improving the filtration efficiency and precision, and making the effluent water quality better. The addition of sodium carboxymethyl cellulose, polyethylene glycol, and other ingredients enhances the mechanical strength and stability of the carbon fiber layer, so that it is not easy to deform and break in the water flow impact and use process, and maintains good filtration performance.

[0038] After adding the antibacterial agent, the carbon fiber layer has the ability to inhibit the growth and reproduction of microorganisms such as bacteria and algae, reduces the breeding of microorganisms in the filter core, reduces the risk of secondary pollution, ensures the safety of water quality and health, and prolongs the service life of the filter core.

[0039] By adding lead removal aids and chloramine removal aids, the composite carbon fiber layer has stronger removal capacity for specific harmful substances such as lead and chloramine, meeting people's demand for high-quality and healthy bathing water quality. The carbon fiber layer is wrapped with a filter layer to form a composite carbon fiber layer. The wrapped filter layer intercepts carbon fibers, diatomite particles and other materials that are not tightly combined to prevent the loss of materials from blocking subsequent filter layers or affecting the water quality; further filter impurities to improve the filtration precision; protect the carbon fiber layer from mechanical damage, wear and tear and water flow impact damage to the structure, prolonging the service life.

[0040] Preferably, the wet forming process is as follows: The slurry is filtered on the forming mold to obtain a blank, and then hot pressed at a hot pressing temperature of 100-110℃ for 20-40s.

[0041] Proper temperature and time control can rearrange and distribute the solid particles such as diatomite in the slurry to form a more dense and uniform microporous structure around the carbon fibers, which can effectively intercept smaller particle size impurities and improve the filtration precision. The carbon fiber layer prepared after hot pressing has higher compressive strength. In actual use, it can withstand larger water flow pressure and mechanical stress, and is not easy to deform or damage, ensuring the normal working state of the filter core. This is particularly important for installation in environments such as showers that have a certain water flow impact, which can prevent the filter core from breaking or having filter layer displacement due to excessive pressure.

[0042] Preferably, the dehydration process is as follows: the slurry after wet forming is first hot pressed at a temperature of 120-150℃ and a pressure of 5-6MPa for 20-30min, and then hot pressed at a temperature of 180-190℃ and a pressure of 5-6MPa for 5-10min; degassing, and finally hot pressed at a temperature of 230-250℃ and a pressure of 8-10MPa for 5-8min, and naturally cooled to end.

[0043] By adopting the above technical solution, the dehydration process is optimized, and the multi-stage high temperature and high pressure treatment of the dehydration process enhances the mechanical strength and stability of the carbon fiber layer, making it not easy to deform and break during use, able to withstand larger water flow pressure, and prolonging the service life of the filter core.

[0044] In the initial stage of dehydration, a large amount of water in the slurry is preliminarily precipitated, and the organic components are softened, laying a foundation for subsequent molding. Then further deep dehydration is carried out to make the slurry more compact and enhance the structural stability. The gas release operation during the period effectively avoids the generation of bubbles and excessive internal pressure under high temperature and high pressure, ensuring the uniformity and compactness of the material. Finally, dehydration significantly improves the density and strength of the carbon fiber layer, while eliminating internal stress to prevent cracking or deformation during cooling.

[0045] The carbon fiber layer treated by special dehydration has more uniform and compact pore structure, and the filtration precision and adsorption performance are greatly improved, which can effectively intercept and adsorb small impurities, harmful substances and odors in water, improve the filtration effect and ensure the purity of the water quality. The enhancement of mechanical strength makes it stable under large water flow pressure and mechanical stress, and it is not easy to be damaged, prolonging the service life of the filter core.

[0046] In summary, the present application has the following advantages: 1. The shower filter core solves the problems of easy clogging, high maintenance cost and short service life of small filter cores through a unique multi-stage composite structure. The multi-layer micron filter layer and the inner and outer support layer of the first-stage filter core composite layer can first intercept large-particle impurities and expand the filtration space. The support filter layer of the second-stage filter core composite layer is in a cylindrical structure to place the filter container, and the composite carbon fiber layer adsorbs soluble impurities and odors, wraps the filter layer and blocks small impurities. The filter material of the third-stage filter core component finely filters the remaining small substances. The overall design cleverly increases the filtration area and impurity capacity, and compared with traditional small filter cores, the same volume can accommodate more impurities, prolonging the use time between two replacements and reducing the situation of clogging and poor water flow. The multi-layer filtration disperses impurities, reduces the overall clogging risk of the filter core, ensures smooth water flow and improves filtration efficiency. Moreover, the filter assembly is detachably connected with the upper and lower end covers, and users can easily disassemble and clean or replace the filter layer. The filter layer that can be cleaned and restored can be used after cleaning, reducing the frequency and cost of replacing the entire filter core. The service life of the new filter core can reach 7-20 months, which is significantly longer than the replacement period of 1-2 months of traditional small filter cores. At the same time, the overall design also retains the advantages of compactness, small space occupation and easy installation. BRIEF DESCRIPTION OF DRAWINGS

[0047] Figure 1 is a schematic diagram of the overall structure of a shower filter core in Example 1; Figure 2 is a schematic diagram of the overall structure of the filter assembly in Example 1; Figure 3 is a schematic diagram of the structure of the first-stage filter core composite layer in Example 1; Figure 4 is a schematic diagram of the structure of the second-stage filter core composite layer and the third-stage filter core component in Example 1; Figure 5 is a structural schematic diagram of the upper end cover described in Example 1; Figure 6 is a structural schematic diagram of the lower end cover described in Example 1; Reference signs: 1, filter assembly; 2, first-stage filter core composite layer; 3, inner support layer; 4, micron-level filter layer; 5, outer support layer; 6, second-stage filter core composite layer; 7, support filter layer; 8, composite carbon fiber layer; 9, third-stage filter core component; 10, filter container; 11, filter material; 1a, upper end cover; 1b, lower end cover; 1c, clamping groove; 1d, clamping column. DETAILED DESCRIPTION

[0048] Preparation Example Preparation Example 1 A composite carbon fiber layer is prepared by the following method: 1) 1000 g of carbon fiber and 7000 g of solvent (water) are mixed in a mass ratio of 1:7, and then broken to obtain a suspension, wherein the particle size of the carbon fiber is 150 mesh; 2) 50 g of diatomite, 10 g of sodium carboxymethyl cellulose, 10 g of polyethylene glycol, 1 g of surfactant (sodium dodecyl benzene sulfonate), 10 g of lead removal aid (iron), 10 g of chlorine amine removal aid (iron oxide), and 10 g of antibacterial agent (chitosan) are added to the suspension to obtain a slurry, and then the slurry is subjected to wet forming, dehydration, and drying treatment to obtain a carbon fiber layer; The wet forming process is as follows: The slurry is filtered on a forming mold to obtain a blank, and then hot pressing is performed at a hot pressing temperature of 100°C and a hot pressing time of 20 s; The dehydration process is as follows: the slurry after wet forming is first hot pressed at a temperature of 120°C and a pressure of 5 MPa for 20 min, and then hot pressed at a temperature of 180°C and a pressure of 5 MPa for 5 min; air is released, and finally hot pressed at a temperature of 230°C and a pressure of 8 MPa for 5 min, and naturally cooled to end; 3) A wrapping filter layer (300-mesh non-woven fabric) is wrapped on the surface of the carbon fiber layer to obtain a composite carbon fiber layer.

[0049] Preparation Examples 2-3 differ from Preparation Example 1 in that the types, amounts, and parameters of the raw materials for preparing the composite carbon fiber layer are different, and the specific differences are shown in Table 1: Table 1 Types, amounts, and parameters of raw materials for preparing the composite carbon fiber layer in Preparation Examples 1-3 Example

[0050] Example 1 A shower filter cartridge, referring to Figure 1 , comprising a filter assembly 1, an upper end cover 1a and a lower end cover 1b, wherein the upper end cover 1a and the lower end cover 1b are located at both ends of the filter assembly 1 and are detachably connected with the filter assembly 1.

[0051] Referring to Figure 2 , the filter assembly 1 comprises, from outside to inside, a first-stage filter cartridge composite layer 2, a second-stage filter cartridge composite layer 6 and a third-stage filter cartridge component 9. Referring to Figure 3 , the first-stage filter cartridge composite layer 2 comprises, from inside to outside, an inner support layer 3, at least one micron-level filter layer 4 and an outer support layer 5, and the inner support layer 3 is arranged around a composite carbon fiber layer 7. The inner support layer 3 is usually a non-woven fabric layer, and in the embodiment, a 30g / m 2 non-woven fabric layer is used. In other embodiments, a 40g / m 2 non-woven fabric layer, a 50g / m 2 non-woven fabric layer, a 60g / m 2 non-woven fabric layer, a 70g / m 2 non-woven fabric layer, an 80g / m 2 non-woven fabric layer or a 90g / m 2 non-woven fabric layer can also be used. In the embodiment, the outer support layer 5 is also a non-woven fabric layer, and in the embodiment, a 30g / m 2 non-woven fabric layer is used. In other embodiments, a 40g / m 2 non-woven fabric layer, a 50g / m 2 non-woven fabric layer or a 60g / m 2 non-woven fabric layer can also be used. In the embodiment, the micron-level filter layer 4 is composed of a 15-micron melt-blown fabric filter layer and a 30-micron melt-blown fabric filter layer. In other embodiments, the micron-level filter layer 4 can also be composed of a 10-micron melt-blown fabric filter layer and a 20-micron melt-blown fabric filter layer or composed of a 10-micron melt-blown fabric filter layer, a 17-micron melt-blown fabric filter layer and a 20-micron melt-blown fabric filter layer.

[0052] Referring to Figure 4 , the second-stage filter cartridge composite layer 6 comprises, from inside to outside, a support filter layer 7 and a composite carbon fiber layer 8. The support filter layer 7 is in a cylindrical structure, and in the embodiment, a PP cotton rod filter layer is used. The thickness of the PP cotton rod filter layer is 5mm, and in other embodiments, it can be 1mm, 2mm, 3mm or 4mm. The composite carbon fiber layer 8 comprises a carbon fiber layer and a wrapping filter layer wrapped on the surface of the carbon fiber layer, and in the embodiment, the wrapping filter layer is a 30g / m 2 non-woven fabric layer. In other embodiments, the wrapping filter layer can also be a 40g / m 2 non-woven fabric layer, a 50g / m 2 non-woven fabric layer, a 60g / m 2Non-woven fabric layer, 70g / m2 non-woven fabric layer, 80g / m 2 Non-woven fabric layer or 90g / m 2 In this embodiment, the thickness of the composite carbon fiber layer 8 is 15 mm. In other embodiments, the thickness of the composite carbon fiber layer 8 may also be 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, 21 mm, 22 mm, 23 mm, 24 mm or 25 mm.

[0053] Reference Figure 2 and 4 The third filter element 9 includes a filter container 10 and a filter material contained in the filter container 10. The filter container 10 is usually made of plastic. In this embodiment, the filter container 10 is non-woven fabric. In this embodiment, the filter material is KDF material.

[0054] Reference Figure 1 、 Figure 5 and Figure 6 The upper end cover 1a and the lower end cover 1b are both provided with a snap-in groove 1c, and the two ends of the filter assembly 1 can be inserted into the snap-in groove 1c respectively. The bottom of the snap-in groove 1c of the upper end cover 1a is provided with a snap-in column 1d, and the snap-in column 1d can be embedded in the supporting filter layer 7. The lower end cover 1b is provided with a through hole.

[0055] At the same time, a filter screen is provided at the bottom of the clamping groove 1c of the lower end cover (1b), and the filter screen is embedded in the through hole. The filter screen is a stainless steel filter screen, a plastic filter screen, a glass filter screen or a ceramic filter screen.

[0056] Example 2 A shower filter element, the difference between this embodiment and Example 1 is that the composite carbon fiber layer comes from Preparation Example 2.

[0057] Example 3 A shower filter element. The difference between this embodiment and Example 1 is that the composite carbon fiber layer comes from Preparation Example 3.

[0058] Comparative Example Comparative Example 1 A shower filter element, the difference between this comparative example and Example 1 is that: 90g / m 2 The non-woven fabric layer replaces the micron-grade filter layer 4.

[0059] Detection method / test method Life service test method: test the filter cartridges of example 1 and comparative example 1, add 5±0.5 NTU turbidity throughout the whole process, test the filter cartridge life by water flow, take points at the end of each 1000 L section, test the water flow rate under 0.2 MPa and 0.41 MPa water pressure respectively, if the water flow rate is higher than 4 L / min after reaching 10000 L, it is qualified. The experimental data is shown in table 2: Table 2 life service test data of example 1 Life service test data of comparative example 1 From the above data, it can be seen that with the increase of water flow, the flow rate under two kinds of water pressure shows a significant downward trend. This shows that during use, the filter material of the filter cartridge may be gradually blocked by impurities, resulting in increased resistance to water flow through the filter cartridge, thereby reducing the flow rate. However, the flow rate of the filter cartridge of the present application is greater than 4 L / min when the water flow is 10000 L, which indicates that the service life of the filter cartridge in the present application can be more than 10000 L, with a long service time.

[0060] Residual chlorine removal rate test: test the filter cartridges of example 1 and comparative example 1, add residual chlorine throughout the whole process, take points at the end of each 1000 L section, test the residual chlorine removal rate under 5 L / min flow rate respectively, the residual chlorine concentration is 2.0±0.2 mg / L throughout the whole process. The experimental data is shown in table 3: Table 3 residual chlorine removal rate test data of example 1 Residual chlorine removal rate test data of comparative example 1 The residual chlorine removal rate of the filter cartridge of example 1 is more than 96% throughout the whole test water flow range (0 L to 10000 L), which is excellent. This shows that the filter cartridge can effectively adsorb or filter out the residual chlorine in the water, and can maintain a high removal efficiency even in the later stage of use. From 0 L to 5000 L to 10000 L, the residual chlorine removal rate changes little, showing that the filter cartridge has good performance stability. This may be because the filter material inside the filter cartridge has a large adsorption capacity and strong durability, and will not be quickly saturated or have a sharp decline in performance within a certain water flow range.

[0061] The specific embodiments are merely an explanation of the present application, which is not a limitation of the present application, and those skilled in the art can make modifications to the embodiments without creative contribution after reading the specification, but as long as it is within the scope of the claims of the present application, it is protected by the patent law.

Claims

1. A shower filter element, characterized by: The shower filter element comprises a filter assembly and an upper end cover (1a) and a lower end cover (1b) located at both ends of the filter assembly, wherein the upper end cover (1a) and the lower end cover (1b) are both detachably connected to the filter assembly; The filter assembly comprises, from the outside to the inside, a first-stage filter core composite layer (2), a second-stage filter core composite layer (6), and a third-stage filter core component (9), wherein the third-stage filter core component (9) comprises a filter container (10) and filter material contained in the filter container (10); The second-stage filter element composite layer (6) includes, from the inside to the outside, a supporting filter layer (7) and a composite carbon fiber layer (8), the composite carbon fiber layer (8) including a carbon fiber layer and a wrapping filter layer wrapped around the surface of the carbon fiber layer, the supporting filter layer (7) is a cylindrical structure, and the filter container (10) is placed in the cylindrical structure; The first-stage filter element composite layer (2) comprises, from the inside to the outside, an inner support layer (3), at least one micron-grade filter layer (4), and an outer support layer (5), wherein the inner support layer (3) is arranged around the composite carbon fiber layer (8).

2. A shower filter according to claim 1, characterized in that: The first-stage filter element composite layer (2) is repeatedly folded into a wave shape and then formed into a circle along the side surface of the wrapped filter layer.

3. The shower filter according to claim 1, characterized in that: The thickness of the supporting filter layer (7) is 1-5 mm, and the thickness of the composite carbon fiber layer (8) is 15-25 mm.

4. The shower filter element according to claim 1, characterized in that: The inner support layer (3) and the wrapped filter layer are non-woven fabric layers of 30-90 g / m², and the outer support layer (5) is a non-woven fabric layer of 30-60 g / m².

5. The shower filter according to claim 1, characterized in that: The supporting filter layer (7) is a PP cotton swab filter layer.

6. The shower filter according to claim 1, characterized in that: The filter material is KDF material.

7. The shower filter according to claim 1, characterized in that: The upper end cover (1a) and the lower end cover (1b) are both provided with a snap-fitting groove (1c), and both ends of the filter assembly can be respectively inserted into the snap-fitting groove (1c); A filter screen is provided at the bottom of the snap-fit ​​groove (1c) of the lower end cover (1b); A clamping column is provided at the bottom of the upper end cover (1a).

8. The shower filter according to claim 1, characterized in that: The preparation method of the composite carbon fiber layer (8) comprises the following steps: 1) Mix carbon fiber and solvent in a mass ratio of 1:(7-8), and then crush to obtain a suspension; 2) adding diatomaceous earth, sodium carboxymethyl cellulose, polyethylene glycol, a surfactant, a lead removal agent, a chloramine removal agent, and an antibacterial agent to the suspension to obtain a slurry, and then wet-forming the slurry and performing dehydration and drying to obtain a carbon fiber layer; 3) Wrapping a filter layer on the surface of the carbon fiber layer to obtain a composite carbon fiber layer (8).

9. A shower filter according to claim 8, characterized in that: The dehydration process is as follows: the wet-formed slurry is first hot-pressed at a temperature of 120-150°C and a pressure of 5-6 MPa for 20-30 minutes, and then hot-pressed at a temperature of 180-190°C and a pressure of 5-6 MPa for 5-10 minutes; degassing, and finally hot-pressed at a temperature of 230-250°C and a pressure of 8-10 MPa for 5-8 minutes, and then naturally cooled.

10. A shower filter according to claim 8, characterized in that: The wet forming process is as follows: The slurry is filtered on a forming die to obtain a blank, which is then hot-pressed at a temperature of 100-110° C. for 20-40 seconds.

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