CN115487587B - Activated carbon particle interlayer filter element - Google Patents

Activated carbon particle interlayer filter element Download PDF

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Publication number
CN115487587B
CN115487587B CN202211140360.2A CN202211140360A CN115487587B CN 115487587 B CN115487587 B CN 115487587B CN 202211140360 A CN202211140360 A CN 202211140360A CN 115487587 B CN115487587 B CN 115487587B
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filter
activated carbon
tube
water
filter tube
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CN115487587A (en
Inventor
陈娴
李理
李福忠
张燕
浦士章
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Shanghai Bluetech Co ltd
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Shanghai Bluetech Co ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
    • B01D35/06—Filters making use of electricity or magnetism
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/28—Treatment of water, waste water, or sewage by sorption
    • C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/48—Treatment of water, waste water, or sewage with magnetic or electric fields
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/12—Halogens or halogen-containing compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/20—Heavy metals or heavy metal compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/03—Pressure
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2301/00—General aspects of water treatment
    • C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions

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  • Engineering & Computer Science (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Water Treatment By Sorption (AREA)
  • Filtering Materials (AREA)

Abstract

The invention relates to the field of water purification, in particular to a drinking water filtering core. The activated carbon particle interlayer filter core comprises a filter core shell, activated carbon particles filled in the filter core shell and a double-layer filter pipe; the double-layer filter pipe comprises an outer filter pipe with a filtering function and an inner filter pipe with a filtering function, wherein the outer filter pipe is positioned on the outer layer; the outer diameter of the inner filter tube is smaller than the inner diameter of the outer filter tube, and the inner filter tube is sleeved in the middle of the outer filter tube; a containing space is formed between the inner filter pipe and the outer filter pipe; active carbon particles are filled in the containing space, and the upper end and the lower end of the containing space are closed; the filter element shell is provided with a water inlet and a water outlet, the water inlet is communicated with the outer side of the double-layer filter pipe, and the water outlet is communicated with the inner side of the double-layer filter pipe. The activated carbon particles may be one of Granular Activated Carbon (GAC), powdered Activated Carbon (PAC), a mixture of Granular Activated Carbon (GAC) and Powdered Activated Carbon (PAC).

Description

Activated carbon particle interlayer filter element
Technical Field
The invention relates to the field of water purification, in particular to a drinking water filtering core.
Background
The active carbon is a black porous solid carbon, and is produced by crushing, molding or carbonizing and activating coal with uniform coal particles. The main component is carbon, and contains a small amount of elements such as oxygen, hydrogen, sulfur, nitrogen, chlorine and the like. The specific surface area of the common active carbon is 500-1700 m 2/g. Has strong adsorption performance and is an adsorbent with extremely wide application.
The active carbon mainly comprises Powdered Active Carbon (PAC), granular Active Carbon (GAC), active carbon fiber felt (ACF) and sintered active carbon filter element (CTO).
Granular Activated Carbon (GAC) breaks up due to the impact of water streams impinging on each other, resulting in blackening of the effluent. And simultaneously, the adsorbed pollutants are released again to form secondary pollution.
The granular activated carbon has insufficient contact between the activated carbon and water flow due to larger gaps among the granules, and the filtration is affected.
When the granular activated carbon is in use, water flow passes through instantaneously, the granular activated carbon can only contact the surface of the granular activated carbon, and most of the inside of the granular activated carbon cannot be used in a contact manner, so that great waste is caused.
The sintered active carbon filter element (CTO) is also called as a carbon rod filter element or a CTO filter element, and the carbon rod filter element is a novel deep layer filter element. The high-quality active carbon is used as raw material, and then the structure is formed by using low-hot-melting adhesive, and the structure is formed by continuous extrusion molding, and then the structure is sintered and solidified at low temperature to form certain strength.
After the activated carbon which is ground into superfine powder is made into a rod-shaped product, the specific surface area of the activated carbon is increased in geometric multiple, adsorption micropores are greatly increased, and each part of the activated carbon can be fully contacted with water flow for high-efficiency utilization and high-efficiency filtration.
But is easy to be blocked due to excessive dust accumulation.
In addition, the sintered activated carbon filter element (CTO) is formed by adding a binder (such as PE resin, PE powder and EVA powder) into granular activated carbon, heating, sintering and extruding. With additional additive material.
In addition, the sintered activated carbon filter element has two functions of adsorption and filtration (average pore diameter is 3-20 um), but the filtration function is lower than that of a PP melt-blown filter element, and the adsorption function is lower than that of a granular activated carbon filter element.
Therefore, the single types of activated carbon have respective disadvantages.
Disclosure of Invention
The invention aims to provide an activated carbon particle interlayer filter element so as to solve at least one technical problem.
The activated carbon particle interlayer filter core comprises a filter core shell and activated carbon particles filled in the filter core shell, and is characterized by further comprising a double-layer filter pipe;
The double-layer filter pipe comprises an outer filter pipe with a filtering function and an inner filter pipe with a filtering function, wherein the outer filter pipe is positioned on the outer layer;
The outer diameter of the inner filter tube is smaller than the inner diameter of the outer filter tube, and the inner filter tube is sleeved in the middle of the outer filter tube;
A containing space is formed between the inner filter pipe and the outer filter pipe;
active carbon particles are filled in the containing space, and the upper end and the lower end of the containing space are closed;
The filter element shell is provided with a water inlet and a water outlet, the water inlet is communicated with the outer side of the double-layer filter pipe, and the water outlet is communicated with the inner side of the double-layer filter pipe.
The activated carbon particles may be one of Granular Activated Carbon (GAC), powdered Activated Carbon (PAC), a mixture of Granular Activated Carbon (GAC) and Powdered Activated Carbon (PAC).
The filter element shell can be a shell of a water tap filter element matched with a water tap filter. So that the patent can be applied to a faucet filter.
The filter element shell can also be a shell of a filter element of a filter kettle matched with the filter kettle. So that the patent can be applied to a filtering kettle.
In the patent, the advantages of the activated carbon filter element (CTO) are realized on the premise of keeping the advantages of the activated carbon particles (including granular activated carbon, powder activated carbon or a combination of the granular activated carbon and the powder activated carbon). At the same time, there are various drawbacks to eliminating both.
In the above design, activated carbon particles are filled in the hollow part of the double-layer filter tube. Before the water to be filtered passes through the active carbon particles, the external filter pipe is used for carrying out primary pre-filtration, so that large particle impurities are filtered. So that the large-particle impurities do not occupy the filtration service life of the activated carbon particles.
And after the active carbon particles, the post-filtration is carried out once by using an inner filter tube. An important use of post filtration is to filter off scattered fine activated carbon powder. Solves the problem that the Granular Activated Carbon (GAC) and the Powdered Activated Carbon (PAC) are broken due to collision of water flow impact, thereby blackening the effluent.
Compared with a sintered activated carbon filter element (CTO), the porous activated carbon filter element has lower production cost, stronger adsorption capacity (the adsorption function is no longer lower than that of a granular activated carbon filter element), and longer service life because micropores are not easy to block.
Compared with the traditional Granular Activated Carbon (GAC) or Powdered Activated Carbon (PAC), the method can be used for modularized production and application, and is more convenient to produce and use. Because the firmness can be larger than that of the sintered activated carbon filter element (CTO) and the shape is easier to be molded, the method is superior to the sintered activated carbon filter element (CTO) in the convenience of use.
In addition, the sintered activated carbon filter element (CTO) is produced with a lot of auxiliary component materials, so that certain pollution exists in production and use. The design in this patent, the pollution in production greatly reduced, pollution in the use can be reduced to almost zero more.
Further, the holding space is filled with compacted activated carbon particles.
The activated carbon particles are generally loose for filtration, so the activated carbon particles have insufficient contact with water flow due to larger gaps among the particles, and the filtration is affected.
In this patent, carry out the compaction back with the active carbon granule, encapsulate into hold the space in. The gap is already small. So the problems that the contact between the activated carbon and the water flow is insufficient and the filtration is affected are solved.
Still further, the activated carbon particles are a mixture of Granular Activated Carbon (GAC) and Powdered Activated Carbon (PAC), and gaps between the Granular Activated Carbon (GAC) are filled with the Powdered Activated Carbon (PAC).
Further solves the problems that the contact between the activated carbon and the water flow is insufficient and the filtration is affected.
The mass specific gravity of the Granular Activated Carbon (GAC) to the Powdered Activated Carbon (PAC) is preferably between one to two and one to three.
The specific gravity relation enables the Granular Activated Carbon (GAC) to be used for supporting the framework, and enables the Powdered Activated Carbon (PAC) to play a role in gap filling. Can be used for ensuring the flow speed and the filtration efficiency of the filtered water flow to be optimized simultaneously.
The outer filter tube and the inner filter tube can be PP cotton tube, ceramic filter tube, glass fiber tube with filter material.
The outer filter tube is preferably a PP cotton tube.
The PP cotton pipe can effectively filter most of larger particles in tap water, and has small resistance to water flow. And thus may be used in combination with activated carbon particles in this patent.
Because the larger particles are mostly filtered out before contacting the activated carbon, the life of the activated carbon particles is greatly increased. Solves the problem of shorter service life of the sintered active carbon filter element (CTO).
In summary, the design in the patent has an adsorption function larger than that of the granular activated carbon filter element; the service life is longer than that of a sintered activated carbon filter element (CTO); the filtered water fully flows through the surface of the granular activated carbon, and most of the inside of the filtered water can be contacted with the surface of the granular activated carbon, so that the service efficiency is greatly improved; the problem of blackening of the effluent is avoided because the Granular Activated Carbon (GAC) breaks up due to the impact of the water flow against each other because of compaction.
And because of the inner filter tube, even if residual scraps exist in the production of various active carbon materials, the residual scraps can be eliminated by the secondary filtration of the inner filter tube.
Therefore, the patent eliminates the different determination of various traditional active carbon filter materials, reserves the advantages, and greatly prolongs the service life. The application range of the activated carbon particles is greatly improved because of the increase of the firmness and the shapeability enhancement of the shape.
The inner filter tube is preferably a PP cotton tube.
The PP cotton pipe can effectively filter the fallen active carbon powder, and has small resistance to water flow. And thus may be used in combination with activated carbon particles in this patent.
Further, the activated carbon particles contained in the containing space are activated carbon particles compacted by more than 4 kg of pressure.
Still further, the activated carbon particles contained in the containing space are activated carbon particles compacted by a pressure of more than 4 kg and less than 30 kg.
This patent limits the pressure to more than 4 kilograms, has avoided the active carbon particle structure not tight, and rivers flow at the problem of granule surface. Limiting the pressure to be within 30 kg, and avoiding limiting water flow due to excessive pressure. Pressure refers to the compaction pressure used in producing a single activated carbon encapsulated filter element assembly during encapsulation of activated carbon particles into a holding space. Not the pressure per unit area. Because the elasticity of the activated carbon particles is not great, the activated carbon particles can be loosened after being compressed before being sealed, and then the activated carbon particles are sealed again.
The inner filter tube is preferably a ceramic filter tube.
The ceramic filter tube not only can effectively filter the fallen active carbon powder, but also has smaller resistance to water flow. Thus, can be used in combination with activated carbon particles in this patent; in addition, the ceramic filter tube has higher hardness and can improve good strength support. For the structure that needs to exert pressure on the activated carbon in this patent, the ceramic filter tube can better guarantee the continuous maintenance of exerting pressure.
Still further, it includes a hollow tube-like shape surrounded by an electro-crystal film, called an electro-crystal film tube; the electric crystal film tube is sleeved in the containing space between the outer filter tube and the inner filter tube.
In the filtering process of water to be filtered (such as tap water), three types of filtering are carried out, namely, the PP cotton pipe is subjected to rough filtering, and then the electric crystal film pipe is subjected to electric adsorption and activated carbon particle adsorption, so that fine filtering is finished.
The electrotransport membrane adsorbs organic, inorganic and pathogenic pollutants through charges, and has positive charges which directly inhibit the breeding of viruses and bacteria and have the capabilities of active grabbing and superposition adsorption. When the harmful substances and charged ions in the water are close to the transistor film, the harmful substances and charged ions are actively adsorbed, and the adsorbed impurities become new outwards expanded adsorbates through charge conduction. The possibility of a reduction in the trapping effect due to excessive amounts of trapped impurities can be avoided.
The electric crystal film is a filtering material based on a glass fiber base layer, and positive charge mineral crystals are attached to the surface of the filtering material; has high filtering capacity, low pressure drop and large specific surface area; is also a first water purifying material with active adsorption capacity; has large pore diameter (average 2 micrometers), high interception precision (0.02 micrometer), and can effectively remove pollutants including viruses, bacteria, heavy metals, organic matters, colloid, cell fragments, DNA, RNA, TOC and the like without damaging high fluidity.
Although the electrotransport membrane has strong adsorption effect on tiny particles, the electrotransport membrane has poor adsorption effect on chlorine and lead (non-colloid) which are common in tap water. But the activated carbon particles can absorb the substances well.
In this patent, through the functional characteristic to filter material, especially to the characteristic of running water is allocated, made filter performance and manufacturing cost, filtration time cost etc. between the demand reach good balance.
Further, the structure may be preferably, from outside to inside, an outer filter tube, an electrotransport membrane tube, activated carbon particles, an inner filter tube.
This design is of substantial significance in order.
First, the outer filter tube is subjected to rough filtration to protect the transistor membrane tube and prolong the service life. Furthermore, the transistor is focused on adsorbing and filtering out electrical impurities. Then, the activated carbon particles filter the non-electric tiny impurities, and in the process, because the water pressure is directed to the inner filter tube, the dropped carbon particles are avoided as much as possible, and are adsorbed by the transistor, so that the transistor is protected. Finally, the inner filter tube filters out carbon particles and other leaked impurities which may fall off.
Furthermore, an electret filter screen with the polarity opposite to that of the electrification of the electric crystal film is arranged between the outer filter tube and the electric crystal film.
Through the electret filter screen, the impurities in the water, which are not electrified, are electrified. The impurities which are weak in charging are made to enhance the electrical property. Therefore, impurities which cannot be adsorbed by the transistor film can be electrically adsorbed, so that impurities with weak adsorption capacity have stronger adsorption.
Thus, the filtering of the particulate impurities which are not electrified and are not easy to be adsorbed by the non-electric filtering device is completed. The quality of the filtered water is improved.
The electret filter screen is preferably a hydrophobic filter screen made of poly-L-lactic acid by electrostatic spinning.
Polylactic acid (PLLA) is a non-toxic biodegradable polymer. Has stronger hydrophobicity. The charge is released or adsorbed and is not easily affected by water. The modified poly-L-lactic acid has excellent electret property after polarization, and can keep high charge storage capacity for a long time.
The poly-L-lactic acid is subjected to electrostatic spinning to form nano-grade electret filaments, and a filter screen made of the hydrophobic nano-electret filaments has good filtering effect.
In addition, some impurities which are not filtered out have electric properties and are more easily absorbed by the transistor film.
Even some bacteria, or DNA fragments, are deactivated by the presence of a discharge effect after passing through the electret filter screen and the transistor film, because they are different in their charge.
The design has unexpected technical effects on the activity of killing viruses through experiments.
The electret filter screen can also be formed by polarized polytetrafluoroethylene PTFE, polyvinylidene fluoride PVDF, poly-L-lactic acid, PMN-PT composite materials and the like.
Further, the electret filter screen is surrounded into a hollow tubular shape, which is called an electret tube;
the electret tube is wrapped outside the transistor film tube, and the nearest distance between the electret tube and the transistor film tube is more than 0.2mm.
The upper end of the electret tube is closed;
the lower end of the electret tube is adhered and fixed at the bottom of the filter element shell.
And enabling water entering from the water inlet to flow through the electret tube and then flow through the transistor film tube.
Further, the following design is performed for the convenience of generation.
A permeable flexible insulating layer is arranged on the electric crystal film, and then the electret filter screen is paved on the flexible insulating layer;
the thickness of the flexible insulating layer is greater than 0.2mm.
Through the design, the electric crystal film and the electret filter screen can be formed in a one-step processing mode, and the electric crystal film and the electret filter screen can be provided with a proper thickness interval on the premise of ensuring close fitting.
The flexible insulating layer may be a plastic mesh.
By adopting the net structure, the resistance to water can be reduced.
The electric crystal film is adhered with a water-permeable flexible insulating layer, the flexible insulating layer is made of a plastic material net, and then the electret filter screen is paved on the flexible insulating layer to form an electric field reinforced filter screen.
The mesh area of the plastic material net is more than 2 square millimeters and less than 15 square millimeters.
According to the conventional design, a relatively dense net is added into the filter element, so that the filter element can play a role in assisting filtration. However, in this patent, a plastic net with large pore diameter is adopted, so that the filtering effect of this net is abandoned.
This violates the conventional design by increasing the flow rate of water from the electret filter screen to the crystal film. This water flow rate is smaller than the water flow rate of the transistor film itself, and the water filtration rate is not improved.
But this patent still adopts this design. This design actually increases the actual flow rate of charged particles in the water (rather than the water flow rate) while keeping the two electrically isolated. The charged impurity particles generated in the electret filter screen can reach the crystal film quickly under the acceleration of the electric field almost without shielding.
Because the charged impurity particles move faster, there is less chance of losing charge in the movement velocity. Is tightly adsorbed or the probability of discharge heating is greater.
Bacteria, viruses, DNA fragments, heavy metal particles, etc., which are difficult to eliminate, are more easily killed or filtered out. Therefore, this violates the conventional design, and achieves unexpected technical effects.
The electric field strengthening filter screen is provided with folds, and the electric crystal film and the electret filter screen form synchronous folds in the folds.
That is, in order to increase the effective screen area, the corrugation forming of the electret screen to the crystalline film can be completed by one operation.
And the synchronous bending of the electric crystal film and the electret filter screen can be effectively ensured, and the spacing distances of all the parts are strictly kept approximately consistent. The electrical performance in the filtration is improved.
A water-resisting layer with the height of more than 0.5cm is arranged below the inner filter tube.
According to conventional designs, it is generally believed that the larger the working area of the filter material, the better. Can effectively improve the water inflow and the filtering speed. However, in the patent, the working area of the inner filter tube is reduced by adopting the design which is contrary to the traditional design.
The reduced working area of the inner filter tube also means that activated carbon particles below 0.5cm are not able to filter water directly.
But in this patent, through reducing the inflow, sacrifice filtration speed, reduce filter medium utilization ratio, improved filtration quality. In experiments, the inventors found that water located in the lower portion of the cartridge housing, when filtered, was essentially only a thin layer of activated carbon particles that flowed through a height below the lower water level. The filtering effect is difficult to ensure.
This patent uses the water proof nature, avoids the water of lower part, flows through shorter active carbon particle structure, has guaranteed sufficient active carbon particle structure filtration length, has guaranteed filtration quality.
The outer filter tube is also wrapped with non-woven fabrics, and the wrapped non-woven fabrics form a non-woven fabric wrapping layer;
the upper part and the lower part of the non-woven fabric wrapping layer are fixedly connected with the upper part and the lower part of the PP cotton pipe;
The upper part and the lower part of the non-woven fabric wrapping layer are provided with tearable tracks; the tearable track is a linear structure which is generated on the non-woven fabric and has weakened material strength.
The nonwoven fabric may be a nonwoven fabric to which a filter material is attached, or a nonwoven fabric having a smaller pore diameter.
In this way, the wrapped nonwoven is allowed to tear from the nonwoven wrapping layer. In the use process, water to be filtered (such as tap water) is filtered through the non-woven fabric firstly. Larger impurities will first be filtered out by the nonwoven. Such as calcifications, rust, etc.
Along with the use, the impurity that adheres to on the non-woven fabrics of skin can show to increase, and then influence the filter effect. In this patent, the nonwoven fabric provided with the tearable track is adopted, so that the user is allowed to tear off the nonwoven fabric of the outer layer when the nonwoven fabric is excessively attached with impurities. In this way, the impurities filtered by the outer layer non-woven fabric eliminate the risk of secondary pollution caused by the fact that the impurities return to the water in the filter element again. And because the non-woven fabrics of the outer layer are removed, the water flow is less blocked, so that the water flow is smoother.
At least 10 layers of non-woven fabrics are also wrapped outside the outer filter tube. So as to be convenient for repeated tearing and use.
Furthermore, the non-woven fabric wound into the non-woven fabric wrapping layer is provided with a frangible joint at a set distance, and the frangible joint is a joint which is easy to tear.
Preferably, the outer filter tube is also wrapped with non-woven fabrics, and at least 5 layers are provided with a frangible node.
Through the design, a user can tear at least 5 layers of non-woven fabrics easily when tearing at one time. Thus, the disposable and thorough cleaning can be completed. The filter element is prevented from being repeatedly disassembled by a user.
The service life of the filter material is greatly prolonged, so that a single filter element can be allowed to filter more water, and the filter is particularly suitable for being matched with a tap filter. Therefore, the water faucet filter element has the advantages of low cost, long service life, good filtering effect, easy molding and the like, and can be more prominent when the filter element shell adopts the shell of the water faucet filter element.
Drawings
Fig. 1 is a schematic diagram of the overall structure of the present invention.
Fig. 2 is a schematic view of an internal structure of the transistor.
Detailed Description
In order that the manner in which the invention is practiced, as well as the features and objects and functions thereof, will be readily understood and appreciated, the invention will be further described in connection with the accompanying drawings.
Referring to fig. 1, the activated carbon composite filter element comprises a filter element shell 2, activated carbon particles 4 filled in the filter element shell 2 and a double-layer filter tube; the double-layer filter tube comprises an outer filter tube 1 with a filtering function and an inner filter tube 6 with a filtering function, wherein the outer filter tube is positioned on the outer layer; the outer diameter of the inner filter tube 6 is smaller than the inner diameter of the outer filter tube 1, and the inner filter tube 6 is sleeved in the middle of the outer filter tube 1; a containing space is formed between the inner filter tube 6 and the outer filter tube 1; the holding space is filled with activated carbon particles 4, and the upper end and the lower end of the holding space are closed; the filter element shell 2 is provided with a water inlet 21 and a water outlet 22, the water inlet 21 is communicated with the outer side of the double-layer filter pipe, and the water outlet 22 is communicated with the inner side of the double-layer filter pipe.
The activated carbon particles 4 are an aggregate, and may be one of Granular Activated Carbon (GAC), powdered Activated Carbon (PAC), a mixture of Granular Activated Carbon (GAC) and Powdered Activated Carbon (PAC).
The cartridge housing 2 may be a housing of a faucet filter cartridge for use with a faucet filter. So that the patent can be applied to a faucet filter.
The filter element shell 2 can also be a shell of a filter element of a filter kettle matched with the filter kettle. So that the patent can be applied to a filtering kettle.
In this patent, the advantages of the activated carbon filter element (CTO) are realized on the premise of retaining the advantages of the activated carbon particles 4 (including granular activated carbon, powdered activated carbon or a combination of both). At the same time, there are various drawbacks to eliminating both.
In the above design, the activated carbon particles 4 are filled in the hollow portion of the double-layer filter tube. Before the water to be filtered passes through the activated carbon particles 4, the external filter pipe 1 is used for pre-filtering for one time, so that large-particle impurities are filtered. So that the large-particle impurities do not occupy the filtering service life of the activated carbon particles 4.
After the activated carbon particles 4, a post-filtration is performed once by an inner filter tube 6. An important use of post filtration is to filter off scattered fine activated carbon powder. Solves the problem that the Granular Activated Carbon (GAC) and the Powdered Activated Carbon (PAC) are broken due to collision of water flow impact, thereby blackening the effluent.
Compared with a sintered activated carbon filter element (CTO), the porous activated carbon filter element has lower production cost, stronger adsorption capacity (the adsorption function is no longer lower than that of a granular activated carbon filter element), and longer service life because micropores are not easy to block.
Compared with the traditional Granular Activated Carbon (GAC) or Powdered Activated Carbon (PAC), the method can be used for modularized production and application, and is more convenient to produce and use. Because the firmness can be larger than that of the sintered activated carbon filter element (CTO) and the shape is easier to be molded, the method is superior to the sintered activated carbon filter element (CTO) in the convenience of use.
In addition, the sintered activated carbon filter element (CTO) is produced with a lot of auxiliary component materials, so that certain pollution exists in production and use. The design in this patent, the pollution in production greatly reduced, pollution in the use can be reduced to almost zero more.
Further, the holding space is filled with compacted activated carbon granules 4. The activated carbon particles 4 are an aggregate of activated carbon having a small volume. The activated carbon particles 4 are generally loose for filtration, so the particles of activated carbon, due to the large gaps between the particles, do not contact sufficiently with the water stream, affecting filtration.
In this patent, after compacting the activated carbon particles 4, they are packed into the holding space. The gap is already small. So the problems that the contact between the activated carbon and the water flow is insufficient and the filtration is affected are solved.
Still further, the activated carbon particles 4 are a mixture of Granular Activated Carbon (GAC) and Powdered Activated Carbon (PAC), and gaps between the Granular Activated Carbon (GAC) are filled with the Powdered Activated Carbon (PAC). Further solves the problems that the contact between the activated carbon and the water flow is insufficient and the filtration is affected.
The mass specific gravity of the Granular Activated Carbon (GAC) to the Powdered Activated Carbon (PAC) is preferably between one to two and one to three. The specific gravity relation enables the Granular Activated Carbon (GAC) to be used for supporting the framework, and enables the Powdered Activated Carbon (PAC) to play a role in gap filling. Can be used for ensuring the flow speed and the filtration efficiency of the filtered water flow to be optimized simultaneously.
The outer filter tube 1 and the inner filter tube 6 can be PP cotton tube, ceramic filter tube, glass fiber tube with filter material.
The outer filter tube 1 is preferably a PP cotton tube. The PP cotton pipe can effectively filter most of larger particles in tap water, and has small resistance to water flow. And thus may be used in combination with the activated carbon particles 4 in this patent.
Because the larger particles are mostly filtered out before contacting the activated carbon, the life of the activated carbon particles 4 is greatly increased. Solves the problem of shorter service life of the sintered active carbon filter element (CTO).
In conclusion, the design in the patent has the adsorption function larger than that of the granular activated carbon filter element; the service life is longer than that of a sintered activated carbon filter element (CTO); the filtered water fully flows through the surface of the granular activated carbon, and most of the inside of the filtered water can be contacted with the surface of the granular activated carbon, so that the service efficiency is greatly improved; the problem of blackening of the effluent is avoided because the Granular Activated Carbon (GAC) breaks up due to the impact of the water flow against each other because of compaction. The active carbon particles can be silver-loaded active carbon materials. Or other auxiliary filter materials may be added.
And because of the inner filter tube 6, even if residual scraps exist in the production of various active carbon materials, the residual scraps are eliminated by the secondary filtration of the inner filter tube 6.
Therefore, the patent eliminates the different determination of various traditional active carbon filter materials, reserves the advantages, and greatly prolongs the service life. The application range of the activated carbon particles 4 is greatly improved because of the increase of the firmness and the shapeability enhancement of the shape.
The inner filter tube 6 is preferably a PP cotton tube. The PP cotton pipe can effectively filter the fallen active carbon powder, and has small resistance to water flow. And thus may be used in combination with the activated carbon particles 4 in this patent.
Further, the activated carbon particles contained in the containing space are activated carbon particles compacted by more than 4 kg of pressure. Still further, the activated carbon particles contained in the containing space are activated carbon particles compacted by a pressure of more than 4 kg and less than 30 kg.
This patent limits the pressure to more than 4 kilograms, has avoided the active carbon particle structure not tight, and rivers flow at the problem of granule surface. Limiting the pressure to be within 30 kg, and avoiding limiting water flow due to excessive pressure. Pressure refers to the compaction pressure used in producing a single activated carbon encapsulated filter element assembly during encapsulation of activated carbon particles into a holding space. Not the pressure per unit area. Because the elasticity of the activated carbon particles is not great, the activated carbon particles can be loosened after being compressed before being sealed, and then the activated carbon particles are sealed again.
The inner filter tube 5 may preferably be a ceramic filter tube. The ceramic filter tube not only can effectively filter the fallen active carbon powder, but also has smaller resistance to water flow. Thus, can be used in combination with activated carbon particles in this patent; in addition, the ceramic filter tube has higher hardness and can improve good strength support. For the structure that needs to exert pressure on the activated carbon in this patent, the ceramic filter tube can better guarantee the continuous maintenance of exerting pressure.
Still further, it also includes a hollow tube-like shape surrounded by an electro-crystal film, called an electro-crystal film tube 3; the transistor film tube 3 is sleeved in the containing space between the outer filter tube 1 and the inner filter tube 6.
In the filtering process, three types of filtering are carried out on water to be filtered (such as tap water), namely, the PP cotton pipe is subjected to rough filtering firstly, and then the electric adsorption and the adsorption of the activated carbon particles 4 are carried out on the electric crystal film pipe 3, so that fine filtering is finished.
The electrotransport membrane adsorbs organic, inorganic and pathogenic pollutants through charges, and has positive charges which directly inhibit the breeding of viruses and bacteria and have the capabilities of active grabbing and superposition adsorption. When the harmful substances and charged ions in the water are close to the transistor film, the harmful substances and charged ions are actively adsorbed, and the adsorbed impurities become new outwards expanded adsorbates through charge conduction. The possibility of a reduction in the trapping effect due to excessive amounts of trapped impurities can be avoided.
The electric crystal film is a filtering material based on a glass fiber base layer, and positive charge mineral crystals are attached to the surface of the filtering material; has high filtering capacity, low pressure drop and large specific surface area; is also a first water purifying material with active adsorption capacity; has large pore diameter (average 2 micrometers), high interception precision (0.02 micrometer), and can effectively remove pollutants including viruses, bacteria, heavy metals, organic matters, colloid, cell fragments, DNA, RNA, TOC and the like without damaging high fluidity.
Although the electrotransport membrane has strong adsorption effect on tiny particles, the electrotransport membrane has poor adsorption effect on chlorine and lead (non-colloid) which are common in tap water. But the activated carbon particles 4 can absorb these substances well.
In this patent, through the functional characteristic to filter material, especially to the characteristic of running water is allocated, made filter performance and manufacturing cost, filtration time cost etc. between the demand reach good balance.
Further, the structure may be preferably, from outside to inside, an outer filter tube 1, an electrotransport membrane tube 3, activated carbon particles 4, and an inner filter tube 6.
This design is of substantial significance in order.
First, the outer filter tube 1 is subjected to rough filtration to protect the transistor 3 and to extend the life. Furthermore, the transistor 3 is focused on adsorbing and filtering out electrical impurities. Then, the active carbon particles 4 filter out non-electric tiny impurities, and in the process, because water pressure is directed to the inner filter tube 6, the falling carbon particles are prevented from being adsorbed by the transistor 3 as much as possible, and the transistor 3 is protected. Finally, the inner filter tube 6 filters out carbon particles and other leaking impurities that may fall off.
Referring to fig. 2, further, an electret filter screen 8 having a polarity opposite to that of the electrification of the crystal film 9 is provided between the outer filter tube 1 and the crystal film.
The electret filter screen 8 is used for carrying out electrification on impurities which are not electrified in the water. The impurities which are weak in charging are made to enhance the electrical property. Thus, impurities which cannot be adsorbed by the transistor film 9 themselves can be electrically adsorbed, and impurities having weak adsorption ability can be more strongly adsorbed.
Thus, the filtering of the particulate impurities which are not electrified and are not easy to be adsorbed by the non-electric filtering device is completed. The quality of the filtered water is improved.
The electret filter screen 8 is preferably a hydrophobic filter screen made by electrostatic spinning of poly-L-lactic acid.
Polylactic acid (PLLA) is a non-toxic biodegradable polymer. Has stronger hydrophobicity. The charge is released or adsorbed and is not easily affected by water. The modified poly-L-lactic acid has excellent electret property after polarization, and can keep high charge storage capacity for a long time.
The poly-L-lactic acid is subjected to electrostatic spinning to form nano-grade electret filaments, and a filter screen made of the hydrophobic nano-electret filaments has good filtering effect.
In addition, some impurities which are not filtered out are provided with electric property, so that the impurities are more easily absorbed by the transistor film 9.
Even some bacteria, or DNA fragments, are deactivated by the presence of a discharge effect after passing through the electret filter 8 and the transistor film 9, because they are differently charged.
The design has unexpected technical effects on the activity of killing viruses through experiments.
The electret filter screen 8 can also be made of polarized polytetrafluoroethylene PTFE, polyvinylidene fluoride PVDF, poly-L-lactic acid, PMN-PT composite materials, and the like.
Further, the electret filter screen 8 is surrounded into a hollow tubular shape, called electret tube; the electret tube is wrapped outside the transistor film tube 3, and the nearest distance between the electret tube and the transistor film tube is more than 0.2mm.
The upper end of the electret tube is closed; the lower end of the electret tube is adhered and fixed at the bottom of the filter element shell 2. The water introduced from the water inlet 21 flows through the electret tube and then through the transistor 3.
Further, the following design is performed for the convenience of generation.
Referring to fig. 2, a water-permeable flexible insulating layer is arranged on the electric crystal film 9 of the electric crystal film tube 3, and then an electret filter screen 8 is paved on the flexible insulating layer; the thickness of the flexible insulating layer is greater than 0.2mm.
Through the design, the electric crystal film and the electret filter screen 8 can be formed in a one-step processing mode, and the gap with proper thickness can be formed on the premise of ensuring close fitting.
The flexible insulating layer may be a plastic mesh. By adopting the net structure, the resistance to water can be reduced.
The flexible insulating layer which is permeable is adhered on the electric crystal film 9, the flexible insulating layer adopts a plastic material net, and then an electret filter screen 8 is paved on the flexible insulating layer to form an electric field strengthening filter screen. The mesh area of the plastic material net is more than 2 square millimeters and less than 15 square millimeters.
According to the conventional design, a relatively dense net is added into the filter element, so that the filter element can play a role in assisting filtration. However, in this patent, a plastic net with large pore diameter is adopted, so that the filtering effect of this net is abandoned.
This violates the conventional design by increasing the flow rate of water from the electret filter screen 8 to the crystal film. This water flow rate is smaller than the water flow rate of the transistor film itself, and the water filtration rate is not improved.
But this patent still adopts this design. This design actually increases the actual flow rate of charged particles in the water (rather than the water flow rate) while keeping the two electrically isolated. The charged impurity particles generated in the electret filter screen 8 can reach the electric crystal film quickly under acceleration of the electric field almost without shielding.
Because the charged impurity particles move faster, there is less chance of losing charge in the movement velocity. Is tightly adsorbed or the probability of discharge heating is greater.
Bacteria, viruses, DNA fragments, heavy metal particles, etc., which are difficult to eliminate, are more easily killed or filtered out. Therefore, this violates the conventional design, and achieves unexpected technical effects.
The transistor 3 is provided with folds in which the transistor film and the electret filter screen 8 form a synchronous fold.
That is, in order to increase the effective screen area, the corrugation of the electret screen 8 to the crystal film can be completed by one operation.
And the synchronous bending of the electric crystal film and the electret filter screen 8 can be effectively ensured, and the spacing distances of all the parts are strictly kept approximately consistent. The electrical performance in the filtration is improved.
A water-resisting layer 5 with the height of more than 0.5cm is arranged below the inner filter tube 6. According to conventional designs, it is generally believed that the larger the working area of the filter material, the better. Can effectively improve the water inflow and the filtering speed. However, in this patent, the working area of the inner filter tube 6 is reduced by adopting a design against the conventional one.
The reduced working area of the inner filter tube 6 also means that activated carbon particles 4 below 0.5cm cannot directly filter the water again.
But in this patent, through reducing the inflow, sacrifice filtration speed, reduce filter medium utilization ratio, improved filtration quality. In experiments, the inventors found that the water at the lower part of the cartridge housing 2, when filtered, was actually only a thin layer of activated carbon particles 4 structure that flowed through a height below the lower water level. The filtering effect is difficult to ensure.
This patent uses the water proof nature, avoids the water of lower part, flows through the 4 structures of shorter active carbon granule, has guaranteed sufficient active carbon granule 4 structure filtration length, has guaranteed filtration quality.
The outer filter tube 1 is also wrapped with non-woven fabrics, and the wrapped non-woven fabrics form a non-woven fabric wrapping layer 7; the upper part and the lower part of the non-woven fabric wrapping layer 7 are fixedly connected with the upper part and the lower part of the PP cotton pipe; the upper part and the lower part of the non-woven fabric wrapping layer 7 are provided with tearable tracks; the tearable track is a linear structure which is formed on the non-woven fabric and has weakened material strength.
The nonwoven fabric may be a nonwoven fabric to which a filter material is attached, or a nonwoven fabric having a smaller pore diameter.
In this way, the wrapped nonwoven is allowed to tear from the nonwoven wrapping layer 7. In the use process, water to be filtered (such as tap water) is filtered through the non-woven fabric firstly. Larger impurities will first be filtered out by the nonwoven. Such as calcifications, rust, etc.
Along with the use, the impurity that adheres to on the non-woven fabrics of skin can show to increase, and then influence the filter effect. In this patent, the nonwoven fabric provided with the tearable track is adopted, so that the user is allowed to tear off the nonwoven fabric of the outer layer when the nonwoven fabric is excessively attached with impurities. In this way, the impurities filtered by the outer layer non-woven fabric eliminate the risk of secondary pollution caused by the fact that the impurities return to the water in the filter element again. And because the non-woven fabrics of the outer layer are removed, the water flow is less blocked, so that the water flow is smoother.
At least 10 layers of non-woven fabrics are also wrapped outside the outer filter tube 1. So as to be convenient for repeated tearing and use.
Further, in the nonwoven fabric wound into the nonwoven fabric wrapping layer 7, at a set distance, there is a frangible joint, which means a joint that is easily torn.
Preferably, the outer filter tube 1 is also wrapped with non-woven fabrics, and at least 5 layers are provided with a breakable node.
Through the design, a user can tear at least 5 layers of non-woven fabrics easily when tearing at one time. Thus, the disposable and thorough cleaning can be completed. The filter element is prevented from being repeatedly disassembled by a user.
The service life of the filter material is greatly prolonged, so that a single filter element can be allowed to filter more water, and the filter is particularly suitable for being matched with a tap filter. Therefore, the water faucet filter element has the advantages of low cost, long service life, good filtering effect, easy molding and the like, and can be more prominent when the filter element shell 2 adopts the shell of the water faucet filter element.
The foregoing has shown and described the basic principles and main features of the present invention and the advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the foregoing embodiments, which have been described in the foregoing description merely illustrates the principles of the invention, and that various changes and modifications may be made therein without departing from the spirit and scope of the invention, which is defined in the appended claims.

Claims (8)

1. The activated carbon particle interlayer filter core comprises a filter core shell and activated carbon particles filled in the filter core shell, and is characterized by further comprising a double-layer filter pipe;
the double-layer filter pipe comprises an outer filter pipe with a filtering function and an inner filter pipe with a filtering function and positioned on the outer layer;
The outer diameter of the inner filter tube is smaller than the inner diameter of the outer filter tube, and the inner filter tube is sleeved in the middle of the outer filter tube;
a containing space is formed between the inner filter tube and the outer filter tube;
active carbon particles are filled in the containing space, and the upper end and the lower end of the containing space are closed;
the filter element shell is provided with a water inlet and a water outlet, the water inlet is communicated with the outer side of the double-layer filter pipe, and the water outlet is communicated with the inner side of the double-layer filter pipe;
Also comprises a hollow tube surrounded by the transistor film, which is called a transistor film tube; the electric crystal film tube is sleeved in the containing space between the outer filter tube and the inner filter tube, and the electric crystal film tube, the outer filter tube, the electric crystal film tube, the active carbon particles and the inner filter tube are sequentially arranged from outside to inside;
An electret filter screen with the polarity opposite to that of the electrification of the electric crystal film is arranged between the outer filter tube and the electric crystal film, and the electret filter screen is a hydrophobic filter screen made of poly-L-lactic acid by electrostatic spinning;
The outer filter tube carries out rough filtration to protect and prolong the service life of the transistor film tube, and moreover, the transistor film tube mainly adsorbs and filters electric impurities;
Then, the active carbon particles filter the non-electric tiny impurities, and in the process, because the water pressure is directed to the inner filter tube, the falling carbon particles are prevented from being adsorbed by the transistor as much as possible, and the transistor is protected;
finally, the inner filter tube filters out carbon particles and other leaked impurities which may fall off.
2. An activated carbon particle sandwich filter cartridge as in claim 1, wherein: the filter element shell is a shell of a water tap filter element matched with a water tap filter.
3. An activated carbon particle sandwich filter cartridge as in claim 1, wherein: filling the compacted activated carbon particles into the accommodating space; the activated carbon particles are prepared from a mixture of granular activated carbon and powdery activated carbon, and gaps among the granular activated carbon are filled with powdery activated carbon; the mass specific gravity of the granular activated carbon and the powdery activated carbon is between one to two and one to three.
4. An activated carbon particle sandwich filter cartridge as in claim 1, wherein: the outer filter tube adopts a PP cotton tube; the inner filter tube adopts a PP cotton tube.
5. An activated carbon particle sandwich filter cartridge as in any of claims 1 to 4 wherein: the outer filter tube is also wrapped with non-woven fabrics, and the wrapped non-woven fabrics form a non-woven fabric wrapping layer;
the upper part and the lower part of the non-woven fabric wrapping layer are fixedly connected with the upper part and the lower part of the PP cotton pipe;
The upper part and the lower part of the non-woven fabric wrapping layer are provided with tearable tracks; the tearable track is a linear structure which is generated on the non-woven fabric and has weakened material strength.
6. An activated carbon particle sandwich filter cartridge as in claim 5, wherein: the outer filter tube is also wrapped with at least 10 layers of non-woven fabrics, the non-woven fabrics of the non-woven fabrics wrapping layers are provided with a breakable node at a set distance, and the breakable node is a junction which is easy to tear.
7. An activated carbon particle sandwich filter cartridge as in claim 6, wherein: the outer filter tube is also wrapped with non-woven fabrics, and at least 5 layers of non-woven fabrics are provided with a breakable node; the user can easily tear off at least 5 layers of non-woven fabrics when tearing off at one time; the filter element can be thoroughly cleaned at one time, and the filter element is prevented from being repeatedly disassembled by a user.
8. An activated carbon particle sandwich filter cartridge as in any of claims 1 to 4 wherein: a water-resisting layer with the height of more than 0.5cm is arranged below the inner filter tube.
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