CN115487587A

CN115487587A - Activated carbon particle interlayer filter element

Info

Publication number: CN115487587A
Application number: CN202211140360.2A
Authority: CN
Inventors: 陈娴; 李理; 李福忠; 张燕; 浦士章
Original assignee: Shanghai Bluetech Co ltd
Current assignee: Shanghai Bluetech Co ltd
Priority date: 2022-09-20
Filing date: 2022-09-20
Publication date: 2022-12-20
Anticipated expiration: 2042-09-20

Abstract

The invention relates to the field of water purification, in particular to a drinking water filtering filter element. The active carbon particle interlayer filter element comprises a filter element shell, active carbon particles filled in the filter element shell and a double-layer filter pipe; the double-layer filter pipe comprises an outer filter pipe with a filtering function positioned on the outer layer and an inner filter pipe with a filtering function positioned on the inner layer; the outer diameter of the inner filter pipe is smaller than the inner diameter of the outer filter pipe, and the inner filter pipe is sleeved in the middle of the outer filter pipe; a containing space is formed between the inner filter pipe and the outer filter pipe; activated 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 filter element.

Background

The active carbon is a black porous solid carbon, and is produced by crushing and molding coal or carbonizing and activating 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 The ratio of the carbon atoms to the carbon atoms is between/g. Has strong adsorption performance, and is an adsorbent with 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) is broken up by the impact of water streams colliding with each other, resulting in blackening of the effluent. Meanwhile, the adsorbed pollutants are released again to form secondary pollution.

The granular activated carbon has insufficient contact with water flow due to large gaps among granules, thereby affecting filtration.

When the granular activated carbon is used, water flow passes through the granular activated carbon instantly and only contacts the surface of the granular activated carbon, most of the inside of the granular activated carbon cannot be used in a contact manner, and great waste is caused.

A sintered activated carbon filter element (CTO), also called a carbon rod filter element or CTO filter element, which is a novel deep filter element. It is made up by using high-quality active carbon as raw material, using low-heat-melting adhesive to form its structure, continuously extruding and forming, then low-temp. sintering and solidifying so as to obtain a certain strength.

After the activated carbon ground into ultrafine powder is made into a rod-shaped product, the specific surface area of the rod-shaped product is increased in a geometric multiple manner, the adsorption micropores are also greatly increased, and each part of the activated carbon can be fully contacted with water flow to realize efficient utilization and efficient filtration.

But the dust is too much to cause blockage.

In addition, the sintered active carbon filter element (CTO) is formed by adding a binder (such as PE resin, PE powder and EVA powder) into granular active carbon, heating, sintering and extruding for molding. With additional added material.

In addition, although the sintered active carbon filter element has two functions of adsorption and filtration (average pore diameter is 3-20 um), the filtration function of the sintered active carbon filter element is lower than that of a PP melt-blown filter element, and the adsorption function of the sintered active carbon filter element is lower than that of a granular active carbon filter element.

Therefore, the single kind of activated carbon has its own disadvantages.

Disclosure of Invention

The invention aims to provide an activated carbon particle interlayer filter element to solve at least one technical problem.

The active carbon particle interlayer filter element comprises a filter element shell and active carbon particles filled in the filter element shell, and is characterized by also comprising a double-layer filter pipe;

the double-layer filter pipe comprises an outer filter pipe with a filtering function positioned on the outer layer and an inner filter pipe with a filtering function positioned on the inner layer;

the outer diameter of the inner filtering pipe is smaller than the inner diameter of the outer filtering pipe, and the inner filtering pipe is sleeved in the middle of the outer filtering pipe;

a containing space is formed between the inner filter pipe and the outer filter pipe;

activated carbon particles are filled in the containing space, and the upper end and the lower end of the containing space are sealed;

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 filtering pipe, and the water outlet is communicated with the inner side of the double-layer filtering pipe.

The activated carbon particle may be one of Granular Activated Carbon (GAC), powdered Activated Carbon (PAC), and a mixture of Granular Activated Carbon (GAC) and Powdered Activated Carbon (PAC).

The filter element shell can be a shell of a faucet filter element matched with a faucet filter for use. So that the present patent may be applied to a faucet filter.

The filter element shell can also be a shell of a filter kettle filter element matched with the filter kettle. So that the utility model can be applied to the filter kettle.

In this patent, the advantages of sintered activated carbon filter elements (CTO) are achieved on the premise that the advantages of activated carbon particles (including granular activated carbon, powdered activated carbon, or a combination of both) are retained. At the same time, there are various disadvantages to eliminate 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 water is firstly subjected to primary prefiltering by the external filter pipe, so that large particle impurities are filtered. So that large-particle impurities do not occupy the filtering service life of the active carbon particles.

And the rear part of the active carbon particles is subjected to primary post-filtration by using an inner filter pipe. One important use of post-filtration is to filter out scattered fine activated carbon powder. Solves the problem that the Granular Activated Carbon (GAC) and the Powdered Activated Carbon (PAC) are broken due to mutual collision of water flow, thereby leading the effluent to turn black.

Compared with a sintered activated carbon filter element (CTO), the carbon filter element has the advantages of lower production cost, stronger adsorption capacity (the adsorption function is no longer lower than that of a granular activated carbon filter element), longer service life due to the fact that micropores are not easy to block.

Compared with the traditional Granular Activated Carbon (GAC) or Powdered Activated Carbon (PAC), the composite activated carbon can be produced and applied in a modularized way, and is more convenient to produce and use. Because the firmness can be higher than that of a sintered activated carbon filter element (CTO) and the shaping is easier, the filter element is better than the sintered activated carbon filter element (CTO) in the aspect of use convenience.

In addition, in the production of the sintered activated carbon filter element (CTO), a plurality of auxiliary component materials are added, so that certain pollution exists in the production and the use. The design in this patent, pollution greatly reduced in production, the pollution in the use can reduce to almost zero more.

Furthermore, the containing space is filled with the compacted activated carbon particles.

The active carbon particles are generally loose for filtration, so the particle active carbon has insufficient contact with water flow due to larger gaps among the particles, and the filtration is influenced.

In this patent, carry out the compaction back with the active carbon granule, the encapsulation is gone into and is held in the space. The gap is already small. Therefore, the problem that the contact between the activated carbon and water flow is insufficient and the filtration is influenced is solved.

Still further, the activated carbon particles are a mixture of Granular Activated Carbon (GAC) and Powdered Activated Carbon (PAC), and gaps among the Granular Activated Carbon (GAC) are filled with the Powdered Activated Carbon (PAC).

Further solves the problem that the contact between the active carbon and the water flow is insufficient to influence the filtration.

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.

This specific gravity relationship allows the Granular Activated Carbon (GAC) to be used to complete the support of the frame, and also allows the Powdered Activated Carbon (PAC) to act as a gap filler. Can be used to ensure that the flow rate of the filtered water stream and the filtration efficiency are simultaneously optimized.

The outer filtering pipe and the inner filtering pipe can adopt PP cotton pipe, ceramic filtering pipe, glass fiber pipe attached with filtering material, etc.

The outer filter pipe is preferably a PP cotton pipe.

The PP cotton pipe can effectively filter most of larger particles in tap water and has smaller resistance to water flow. And thus may be used in combination with activated carbon particles in this patent.

The life of the activated carbon particles is greatly increased because a large portion of the larger particles will be filtered out before contacting the activated carbon. Solves the problem of short service life of the sintered active carbon filter element (CTO).

In summary, the above design in this patent has an adsorption function greater 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 granular activated carbon can be contacted with the granular activated carbon, so that the use efficiency is greatly improved; the problem of the Granular Activated Carbon (GAC) being broken up by the impact of the water streams colliding with each other, resulting in blackening of the effluent, is avoided because of the compaction.

And because the inner filtering pipe is arranged, even if residual powder in the production exists in various activated carbon materials, the residual powder can be eliminated by the secondary filtering of the inner filtering pipe.

Therefore, the patent eliminates different determinations of traditional various active carbon filter materials, retains the advantages and greatly prolongs the service life. Because the firmness is increased and the plastic shape of the shape is enhanced, the application range of the activated carbon particles is greatly improved.

The inner filtering pipe is preferably a PP cotton pipe.

The PP cotton pipe can effectively filter the fallen activated 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 pressure of more than 4 kg.

And furthermore, the activated carbon particles contained in the containing space are activated carbon particles compacted by pressure of more than 4 kg and less than 30 kg.

This patent is more than 4 kilograms with pressure restriction, has avoided the activated carbon particle structure not compact, and rivers flow through at the granule surface problem. The limit is within 30 kilograms, and the restriction of water flow caused by overhigh pressure is avoided. The pressure refers to the compaction pressure used in the process of producing a single active carbon packaging type filter element assembly and packaging active carbon particles into a containing space. Not to say pressure per unit area. Because the elasticity of the active carbon particles is not large, the active carbon particles can be loosened after being compressed before sealing and then sealed.

The inner filter pipe is preferably a ceramic filter pipe.

The ceramic filter tube can effectively filter the fallen activated carbon powder and has small resistance to water flow. It can therefore be used in this patent in combination with activated carbon granules; in addition, the ceramic filter pipe has higher hardness, and can improve good strength support. For the structure needing to pressurize the activated carbon in the patent, the ceramic filter tube can better ensure the continuous maintenance of the pressurizing pressure.

Furthermore, the device also comprises a hollow tubular tube surrounded by the crystalline film, which is called a crystalline film tube; the crystal membrane pipe is sleeved in the containing space between the outer filter pipe and the inner filter pipe.

During the filtration process of water (such as tap water) to be filtered, three types of filtration are carried out, firstly, the PP cotton pipe is used for rough filtration, and then the crystal membrane pipe is used for carrying out electric adsorption and activated carbon particle adsorption, thus finishing fine filtration.

The electric crystal film adsorbs organic, inorganic and pathogenic pollutants through electric charges, and the positive charges of the electric crystal film not only directly inhibit breeding of viruses and bacteria, but also have the capacity of actively grabbing and superposing adsorption. When the harmful substances and charged ions in the water are close to the crystal film, the impurities are actively adsorbed, and the adsorbed impurities become new adsorbates expanding outwards through charge conduction. It is possible to avoid the possibility of a reduction in the interception effect due to an excessive amount of intercepted impurities.

The crystal film is a filter material based on a glass fiber base layer and with positive charge mineral crystals attached to the surface; the filter has high filtering capacity, low pressure drop and larger specific surface area; is also a first water purification material with active adsorption capacity; has large aperture (average 2 microns), high interception precision (0.02 micron), and can effectively remove pollutants including viruses, bacteria, heavy metals, organic matters, colloids, cell debris, DNA, RNA, TOC and the like without destroying high fluidity.

Although the crystalline film has strong adsorption effect on the tiny particles, the adsorption effect on chlorine and lead (non-colloid) which are common in tap water is poor. But activated carbon particles can adsorb these substances well.

In this patent, through to filtering material functional characteristic, allocate to the characteristic that is the running water very much, make and reach good balance between demands such as filtration performance and manufacturing cost, filtration time cost.

Further, the structure may preferably be, in order from the outside to the inside, an outer filter tube, an electric crystal film tube, activated carbon particles, and an inner filter tube.

This design, in order, has a substantial significance.

Firstly, the outer filter tube is coarsely filtered to protect the crystal membrane tube and prolong the service life. Furthermore, the electric impurities are adsorbed and filtered by the transistor at the double points. Then, the activated carbon particles filter non-electric tiny impurities, and in the process, because the water pressure points to the inner filter tube, the falling carbon particles are prevented as much as possible from being adsorbed by the crystal film tube, so that the crystal film tube is protected. Finally, the inner filtering pipe filters out carbon particles which may fall off and other leaked impurities.

Furthermore, an electret filter screen with the polarity opposite to that of the crystal film is arranged between the outer filter tube and the crystal film.

Through the electret filter screen, carry out electrified for the uncharged impurity of aquatic itself. The impurities with weak self-charge enhance the electrical property. Therefore, the impurities which can not be absorbed by the crystal film can be electrically absorbed, and the impurities with weak absorption capability have stronger absorption.

Thereby completing the filtration of the particle impurities which are not charged and are not easy to be absorbed by the non-electric filtering device. The quality of the filtered water quality is improved.

The electret filter screen 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. Therefore, the electric charge is released or absorbed, and the influence of water is not easily generated. The modified poly-L-lactic acid has excellent electret characteristics after polarization, and can keep high charge storage capacity for a long time.

The poly-L-lactic acid electrostatic spinning forms nano electret filaments, and a filter screen made of hydrophobic nano electret filaments has a good filtering effect.

In addition, some impurities which are not filtered are electrically charged and are easier to be absorbed by the crystal film.

Even some bacteria, or DNA fragments, are killed by the discharge effect after passing through the electret filter and the crystal film because of their different electrical properties.

The above design has unexpected technical effect on the activity of killing virus through experiments.

The electret filter screen can also be made of poled 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 tube shape which is called an electret tube;

the electret tube is wrapped outside the transistor film tube, and the distance between the two nearest parts is larger than 0.2mm.

The upper end of the electret tube is closed;

the lower end of the electret tube is bonded and fixed at the bottom of the shell of the filter element shell.

And enabling the water entering from the water inlet to flow through the electret tube and then the electric crystal film tube.

Further, the following design is made for the convenience of production.

Arranging a permeable flexible insulating layer on the crystal film, and then laying the electret filter screen on the flexible insulating layer;

the thickness of the flexible insulating layer is greater than 0.2mm.

Through the design, the crystal film and the electret filter screen can be processed and formed at one time, and the interval with proper thickness can be formed on the premise of ensuring the close attachment.

The flexible insulating layer may be a plastic mesh.

The resistance to water can be reduced by adopting the net structure.

And a water-permeable flexible insulating layer is bonded on the crystal film, the flexible insulating layer is made of a plastic net, and then the electret filter screen is laid on the flexible insulating layer to form an electric field reinforced filter screen.

The mesh area of the plastic 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 auxiliary filtering effect can be achieved. However, in this patent, a large pore plastic mesh is used, thereby abandoning the filtering effect of this mesh.

This contravenes conventional designs by increasing the electret filter to film flow rate. The flow velocity of the water is smaller than that of the crystal film, so that the filtering speed of the water is not improved.

This patent still employs this design. This design actually increases the actual flow velocity of the charged particles in the water (rather than the water flow velocity) while maintaining electrical isolation between the two. The charged impurity particles generated in the electret filter can almost completely shield and quickly reach the crystal film under the acceleration of an electric field.

Because the charged impurity particles move faster, the potential for charge loss is less in the speed of motion. The probability of being tightly attracted or the discharge generating heat is greater.

Bacteria, viruses, DNA fragments, heavy metal particles, etc., impurities that are difficult to eliminate, are more easily killed or filtered out. Therefore, the design goes against 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, when the filter is pleated to increase the effective filter area, the pleat formation of the electret filter on the crystal film can be completed by one operation.

And the synchronous bending of the crystal film and the electret filter screen can be effectively ensured, and the spacing distances at all positions are strictly kept to be approximately consistent. The electrical performance in filtering is improved.

A water-resisting layer with the height larger than 0.5cm is arranged below the inner filter pipe.

In conventional designs, it is generally believed that the larger the working area the better the filter material. Can effectively improve the water inflow and the filtering speed. However, in the patent, the traditional design is adopted, and the working area of the inner filter pipe is reduced.

The reduction in the working area of the inner filter tube also means that activated carbon particles below 0.5cm cannot directly filter the water again.

However, in the patent, through reducing the inflow, sacrifice filter speed, reduce the filter media utilization ratio, improved filtration quality. In experiments, the inventors have found that water in the lower portion of the cartridge housing, when filtered, simply flows through a thin layer of activated carbon particles at a height below the lower water level. The filtering effect is difficult to ensure.

This patent uses water proof nature, avoids the water of lower part, flows through shorter active carbon particle structure, has guaranteed sufficient active carbon particle structure filter length, has guaranteed filtration quality.

The outer filter pipe 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 respectively;

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 generated on the non-woven fabric and weakened in material strength.

The nonwoven fabric may be a nonwoven fabric having a filter material attached thereto or a nonwoven fabric having a small pore size.

This allows the wrapped nonwoven to be torn from the nonwoven wrapping layer. In the using process, the water to be filtered (such as tap water) is filtered through the non-woven fabric. Larger impurities are first filtered out by the nonwoven. Such as calcification, rust, etc.

With the use, the impurities attached to the non-woven fabric on the outer layer can be increased obviously, and the filtering effect is further influenced. In this patent, adopted and be provided with the non-woven fabrics that can tear the orbit, consequently allowed the user to tear outer non-woven fabrics when the non-woven fabrics adheres to impurity too much. Therefore, the impurities filtered by the outer layer of non-woven fabric can eliminate the risk of secondary pollution caused by the water which returns to the filter element again. And because the non-woven fabrics of the outer layer are removed, the obstruction to the water flow is smaller, and the water flow is smoother.

At least 10 layers of non-woven fabrics are wrapped outside the outer filter tube. So as to be torn off repeatedly for use.

Furthermore, the non-woven fabric wound into the non-woven fabric wrapping layer has a breakable node at a set distance, wherein the breakable node is a connection point which is easy to tear.

Preferably, the outer filter pipe is also wrapped by non-woven fabrics, and at least 5 layers are provided with a breakable node.

Through the design, a user can tear off at least 5 layers of non-woven fabrics easily when tearing off the non-woven fabrics at one time. Thus, one-time and relatively thorough cleaning can be completed. Avoid the user to disassemble the filter core repeatedly.

This patent is because prolonged the life of filter media greatly, consequently can allow single filter core to filter more water, and specially adapted uses with tap filter collocation. So this patent, with low costs, long service life, filter effect are good, easily mould advantages such as type, when the filter core shell adopts tap to filter the shell of filter core, more can obtain the salient.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention.

FIG. 2 is a schematic diagram of a transistor and its internal structure.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific drawings.

Referring to fig. 1, the active carbon composite filter element comprises a filter element shell 2, active carbon particles 4 filled in the filter element shell 2, and a double-layer filter pipe; the double-layer filtering pipe comprises an outer filtering pipe 1 with a filtering function positioned on the outer layer and an inner filtering pipe 6 with a filtering function positioned on the inner layer; the outer diameter of the inner filtering pipe 6 is smaller than the inner diameter of the outer filtering pipe 1, and the inner filtering pipe 6 is sleeved in the middle of the outer filtering pipe 1; a holding space is formed between the inner filtering pipe 6 and the outer filtering pipe 1; filling activated carbon particles 4 into the containing space, and sealing the upper end and the lower end of the containing space; 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 filtering pipe, and the water outlet 22 is communicated with the inner side of the double-layer filtering pipe.

The activated carbon particles 4 are an aggregate of Granular Activated Carbon (GAC), powdered Activated Carbon (PAC), a mixture of Granular Activated Carbon (GAC) and Powdered Activated Carbon (PAC).

The filter element housing 2 can be a housing of a faucet filter element used in cooperation with a faucet filter. So that the present patent may be applied to a faucet filter.

The filter element shell 2 can also be a shell of a filter kettle filter element matched with the filter kettle. So that the utility model can be applied to the filter kettle.

In this patent, the advantages of the sintered activated carbon filter element (CTO) are achieved on the premise that the advantages of the activated carbon particles 4 (including granular activated carbon, powdered activated carbon, or a combination of both) are retained. At the same time, there are various disadvantages to eliminate both.

In the above design, 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 water is firstly subjected to primary prefiltering by the external filter pipe 1, 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, the inner filter tube 6 is used for primary post-filtration. One important use of post-filtration is to filter out scattered fine activated carbon powder. Solves the problem that the Granular Activated Carbon (GAC) and the Powdered Activated Carbon (PAC) are broken due to the mutual collision of the impact of water flow, thereby leading the effluent to turn black.

Compared with the traditional Granular Activated Carbon (GAC) or Powdered Activated Carbon (PAC), the modularized production and application can be realized, and the production and the use are more convenient. Because the firmness can be higher than that of a sintered activated carbon filter element (CTO) and the shaping is easier, the filter element is better than the sintered activated carbon filter element (CTO) in the aspect of use convenience.

Further, the containing space is filled with the compacted activated carbon particles 4. The activated carbon particles 4 are an aggregate of activated carbon having a small volume. The activated carbon granules 4 are generally loose for filtration, so the granular activated carbon has insufficient contact with water flow due to large gaps among the granules, and filtration is affected.

In this patent, carry out the compaction back with active carbon particle 4, the encapsulation is gone into and is held in the space. The gap is already small. Therefore, the problem that the contact between the activated carbon and water flow is insufficient to influence the filtration is solved.

Furthermore, 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 problem that the contact between the active carbon and the water flow is insufficient to influence the filtration.

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. This specific gravity relationship allows the Granular Activated Carbon (GAC) to be used to complete the support of the frame, and also allows the Powdered Activated Carbon (PAC) to act as a gap filler. Can be used to ensure that the flow rate of the filtered water flow and the filtering efficiency are simultaneously optimized.

The outer filtering pipe 1 and the inner filtering pipe 6 can adopt PP cotton pipe, ceramic filtering pipe, glass fiber pipe attached with filtering material, etc.

The outer filtering pipe 1 is preferably a PP cotton pipe. The PP cotton pipe can effectively filter most of larger particles in tap water and has smaller resistance to water flow. And thus may be used in combination with activated carbon particles 4 in this patent.

The life of the activated carbon particles 4 is greatly increased because a large portion of the larger particles will be filtered out before contacting the activated carbon. Solves the problem of short 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 the using efficiency of most of the inside of the filtered water can be greatly improved by contacting; the problem of the Granular Activated Carbon (GAC) being broken up by the impact of the water streams colliding with each other, resulting in blackening of the effluent, is avoided because of the compaction. The activated carbon particles can adopt a silver-loaded activated carbon material. Or other auxiliary filter material may be added.

And because of the provision of the inner filtering tube 6, even if there are residual scraps in the production among various activated carbon materials, they are eliminated by the re-filtration of the inner filtering tube 6.

Therefore, the patent eliminates different determinations of traditional various active carbon filter materials, retains the advantages and greatly prolongs the service life. The application range of the activated carbon particles 4 is greatly improved due to the increase of firmness and the plastic shape enhancement of the shape.

The inner filtering pipe 6 is preferably a PP cotton pipe. The PP cotton pipe can effectively filter the fallen activated carbon powder and has small resistance to water flow. And thus may be used in combination with activated carbon particles 4 in this patent.

Further, the activated carbon particles contained in the containing space are activated carbon particles compacted by pressure of more than 4 kg. And furthermore, the activated carbon particles in the containing space are compacted by more than 4 kg and less than 30 kg.

The inner filtering pipe 5 can also preferably adopt a ceramic filtering pipe. The ceramic filter tube not only can effectively filter the fallen activated carbon powder, but also has small resistance to water flow. And thus may be used in combination with activated carbon particles in this patent; in addition, the ceramic filter pipe has higher hardness, and can improve good strength support. For the structure needing to pressurize the activated carbon in the patent, the ceramic filter tube can better ensure the continuous maintenance of the pressurizing pressure.

Furthermore, the device also comprises a hollow tubular tube which is surrounded by the crystalline membrane and is called a crystalline membrane tube 3; the crystal membrane tube 3 is sleeved in the containing space between the outer filtering tube 1 and the inner filtering tube 6.

During the filtration process of the water to be filtered (such as tap water), three types of filtration are carried out, firstly, a PP cotton pipe is used for rough filtration, and then, the electric crystal film pipe 3 is used for electric adsorption and activated carbon particles 4 are used for adsorption, so that fine filtration is completed.

The electric crystal film adsorbs organic, inorganic and pathogenic pollutants through electric charges, and the positive charges of the electric crystal film not only directly inhibit breeding of viruses and bacteria, but also have the capacity of actively grabbing and superposing adsorption. When the harmful substances and charged ions in the water are close to the crystal film, the impurities are actively adsorbed, and the adsorbed impurities become new adsorbates expanding outwards through charge conduction. It is possible to avoid the possibility of the interception effect being lowered due to the excessive amount of the intercepted foreign substances.

Although the crystalline film has strong adsorption effect on the tiny particles, the adsorption effect on chlorine and lead (non-colloid) which are common in tap water is poor. But activated carbon particles 4 can adsorb these substances well.

Further, the structure may preferably be such that the outer filtration tube 1, the crystal membrane tube 3, the activated carbon granules 4, and the inner filtration tube 6 are arranged in this order from the outside to the inside.

This design, in order, has a substantial significance.

First, the outer filtering pipe 1 is coarsely filtered to protect the electroformed pipe 3 and prolong the life. Furthermore, the transistor 3 mainly absorbs and filters the electrical impurities. Then, the activated carbon particles 4 filter non-electric tiny impurities, and in the process, because the water pressure points to the inner filter pipe 6, the falling carbon particles are prevented as much as possible from being adsorbed by the crystal film tube 3, and the crystal film tube 3 is protected. Finally, the inner filtering tube 6 filters out possible shed carbon particles and other filtered impurities.

Referring to fig. 2, further, an electret filter screen 8 having a polarity opposite to that of the crystal film 9 is disposed between the outer filter tube 1 and the crystal film.

Through electret filter screen 8, for the uncharged impurity of aquatic itself carries out the electrification. The impurities with weak self-charge enhance the electrical property. Therefore, the impurities which cannot be adsorbed by the crystal film 9 can be electrically adsorbed, and the impurities with weak adsorption capability have stronger adsorption.

Therefore, the filtering of the particle impurities which are not charged and are not easy to be absorbed by the non-electric filtering device is completed. The quality of the filtered water quality is improved.

The electret filter 8 is preferably a hydrophobic filter made by electrospinning poly (L-lactic acid).

Polylactic acid (PLLA) is a non-toxic biodegradable polymer. Has stronger hydrophobicity. Therefore, the electric charge is released or adsorbed and is not easily influenced by water. The modified poly-L-lactic acid has excellent electret characteristics after polarization, and can keep high charge storage capacity for a long time.

The poly-L-lactic acid electrostatic spinning forms nano-level electret filaments, and a filter screen made of hydrophobic nano-electret filaments has a good filtering effect.

In addition, some impurities which are not filtered out have electrical property and are easier to be absorbed by the crystal film 9.

Even some bacteria, or DNA fragments, are killed by the electric discharge effect after passing through the electret filter 8 and the crystal film 9 because they have different electric properties.

The electret filter screen 8 can also be made of a poled polytetrafluoroethylene PTFE, polyvinylidene fluoride PVDF, poly-L-lactic acid, PMN-PT composite material or the like.

Further, the electret filter screen 8 is surrounded into a hollow tubular shape, which is called an electret tube; the electret tube is wrapped outside the crystal film tube 3, and the distance between the two nearest parts is larger than 0.2mm.

The upper end of the electret tube is closed; the lower end of the electret tube is bonded and fixed at the bottom of the filter element shell 2. The water entering from the water inlet 21 flows through the electret tube and then through the crystal film tube 3.

Further, the following design is made for the convenience of production.

Referring to fig. 2, a water-permeable flexible insulating layer is arranged on a crystal film 9 of the crystal film tube 3, and then an electret filter screen 8 is laid on the flexible insulating layer; the thickness of the flexible insulating layer is greater than 0.2mm.

Through the design, the crystal film and the electret filter screen 8 can be processed and formed at one time, and the interval with proper thickness can be ensured on the premise of tight fitting.

The flexible insulating layer may be a plastic mesh. The resistance to water can be reduced by adopting the net structure.

A permeable flexible insulating layer is bonded on the crystal film 9, the flexible insulating layer is made of a plastic net, and then an electret filter screen 8 is laid on the flexible insulating layer to form an electric field reinforced filter screen. The mesh area of the plastic net is more than 2 square millimeters and less than 15 square millimeters.

This contrary to conventional designs is to increase the flow rate of the water from the electret filter screen 8 to the crystalline film. The water flow rate is smaller than that of the crystal membrane, so that the filtering speed of water is not improved.

This patent still employs this design. This design actually increases the actual flow velocity of the charged particles in the water (rather than the water flow velocity) while maintaining electrical isolation between the two. The charged impurity particles generated in the electret filter mesh 8 can reach the crystal film rapidly under the acceleration of the electric field almost without being shielded.

Because the charged impurity particles move faster, the potential for charge loss is less in the speed of motion. The probability of being tightly adsorbed or the discharge generating heat is greater.

The crystal film tube 3 is provided with a fold in which the crystal film and the electret filter 8 form a synchronous fold.

That is, when the electret filter 8 is pleated to increase the effective filter area, the pleat formation of the electret filter 8 on the crystal film can be completed by one operation.

And the synchronous bending of the crystal film and the electret filter screen 8 can be effectively ensured, and the spacing distances at all positions are strictly kept approximately consistent. The electrical performance in filtering is improved.

A water-resisting layer 5 with the height more than 0.5cm is arranged below the inner filtering pipe 6. In conventional designs, it is generally believed that the larger the working area the better the filter material. Can effectively improve the water inflow and improve the filtering speed. However, in this patent, the working area of the inner filtering pipe 6 is reduced by adopting a design contrary to the traditional design.

The reduction in the working area of the inner filter tube 6 also means that the activated carbon granules 4 below 0.5cm cannot directly filter the water again.

However, in the patent, through reducing the inflow, sacrifice filter speed, reduce the filter media utilization ratio, improved filtration quality. In experiments, the inventors have found that water located in the lower portion of the cartridge housing 2, when filtered, simply flows through a thin layer of activated carbon granules 4 at a height below the lower water level. The filtering effect is difficult to ensure.

This patent uses water proof nature, avoids the water of lower part, flows through short 4 structures of active carbon granule, has guaranteed sufficient 4 structure filter lengths of active carbon granule, has guaranteed filter quality.

The outer filter pipe 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 generated on the non-woven fabric and weakened in material strength.

The nonwoven fabric may be a nonwoven fabric to which a filter material is attached, or a nonwoven fabric having a small pore size.

This allows the wrapped nonwoven fabric to be torn from the nonwoven fabric wrapping 7. In the using process, the water to be filtered (such as tap water) is filtered through the non-woven fabric. Larger impurities are first filtered out by the nonwoven. Such as calcification, rust, etc.

With the use, the impurities attached to the non-woven fabric of the outer layer can be increased remarkably, and the filtering effect is further influenced. In this patent, adopted and be provided with the non-woven fabrics that can tear the orbit, consequently allowed the user to tear outer non-woven fabrics when the non-woven fabrics adheres to impurity too much. Therefore, the impurities filtered by the outer layer of non-woven fabric can eliminate the risk of secondary pollution caused by the water which returns to the filter element again. And because the non-woven fabrics of the outer layer are removed, the obstruction to the water flow is smaller, and the water flow is smoother.

The outer filter tube 1 is wrapped with at least 10 layers of non-woven fabrics. So as to be convenient for repeated tearing and use.

Furthermore, the non-woven fabric wound into the non-woven fabric wrapping layer 7 has a breakable node at a predetermined distance, and the breakable node is a connection point which is easily torn.

Preferably, the non-woven fabrics wrapped outside the outer filter pipe 1 are provided with a breakable node in at least 5 layers.

This patent is because prolonged the life of filter media greatly, consequently can allow single filter core to filter more water, and specially adapted uses with tap filter collocation. So this patent, with low costs, long service life, filter effect are good, easily mould advantages such as type, when filter core shell 2 adopts tap to filter the shell of filter core, more can obtain the salient.

The foregoing shows and describes the general principles and features of the present invention, together with the advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention as defined in the appended claims.

Claims

1. The active carbon particle interlayer filter element comprises a filter element shell and active carbon particles filled in the filter element shell, and is characterized by also comprising a double-layer filter pipe;

the outer diameter of the inner filter pipe is smaller than the inner diameter of the outer filter pipe, and the inner filter pipe is sleeved in the middle of the outer filter pipe;

activated 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;

filling activated carbon particles in the hollow part of the double-layer filter pipe, so that before the water to be filtered passes through the activated carbon particles, firstly, the external filter pipe is used for primary pre-filtration, and large particle impurities are filtered; so that large-particle impurities do not occupy the filtering service life of the activated carbon particles;

the rear part of the active carbon particles is subjected to primary post-filtration by an inner filter pipe; an important application of post-filtration is to filter scattered tiny activated carbon powder; the problem of because the impact of rivers collides each other and is broken to lead to out the water blacking is solved.

2. The activated carbon particle sandwich filter element of claim 1 wherein: the filter element shell is a shell of the faucet filter element matched with the faucet filter.

3. The activated carbon particle sandwich filter element of claim 1 wherein: the containing space is filled with the compacted activated carbon particles; after being compacted, the activated carbon particles are packaged in the containing space, and the gaps are very small, so that the problem that the filtering is influenced due to insufficient contact between the activated carbon and water flow is solved;

furthermore, the active carbon particles are a mixture of granular active carbon and powdered active carbon, and gaps among the granular active carbon are filled with the powdered active carbon;

the problem that the filtration is influenced due to insufficient contact between the activated carbon and water flow is further solved;

the mass proportion of the granular activated carbon to the powdered activated carbon is preferably between one to two and one to three;

the specific gravity relation ensures that the granular activated carbon is used for supporting the frame and the powdered activated carbon can play a role in filling gaps; for ensuring that the flow rate of the filtered water stream and the filtration efficiency are simultaneously optimised.

4. The activated carbon particle sandwich filter element of claim 1 wherein: the outer filter pipe adopts a PP cotton pipe; the inner filter pipe adopts a PP cotton pipe.

5. The activated carbon particle sandwich filter element of claim 1 wherein: the tube also comprises a hollow tube surrounded by the crystal film, which is called as a crystal film tube; the crystal membrane pipe is sleeved in the containing space between the outer filter pipe and the inner filter pipe.

6. The activated carbon particle sandwich filter element of claim 5 wherein: the outer filter tube, the electric crystal film tube, the active carbon particles and the inner filter tube are arranged from outside to inside in sequence;

the outer filter tube is used for rough filtering, protecting the crystal membrane tube and prolonging the service life. Then, the electric impurities are adsorbed and filtered by the gravity of the crystal film tube;

then, the activated carbon particles filter non-electric tiny impurities, and in the process, because the water pressure points to the inner filter tube, the falling carbon particles are prevented as much as possible from being adsorbed by the electric crystal film tube, so that the electric crystal film tube is protected;

finally, the inner filtering pipe filters carbon particles which may fall off and other leaked impurities.

7. The activated carbon particle sandwich filter element of claim 5 wherein: an electret filter screen with the polarity opposite to that of the crystal film is arranged between the outer filter tube and the crystal film.

8. The activated carbon particle sandwich filter element of any one of claims 1-7 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;

9. The activated carbon particle sandwich filter element of claim 8 wherein:

the outer filter pipe is also wrapped with at least 10 layers of non-woven fabrics, and the non-woven fabrics wound into the non-woven fabric wrapping layers are provided with a breakable node at a set distance, wherein the breakable node is a connecting part which is easy to tear.

10. The activated carbon particle sandwich filter element of claim 9 wherein: the outer filter pipe is also wrapped by non-woven fabrics, and at least 5 layers are provided with a breakable node; the user can easily tear off at least 5 layers of non-woven fabrics when tearing off the non-woven fabrics at one time; can accomplish disposable comparatively thorough cleaing away, avoid the user to disassemble the filter core repeatedly.