EP3648865A1 - Milieu filtrant et procédé de fabrication, élément filtrant, utilisation de l'élément filtrant et système d'injection d'eau - Google Patents

Milieu filtrant et procédé de fabrication, élément filtrant, utilisation de l'élément filtrant et système d'injection d'eau

Info

Publication number
EP3648865A1
EP3648865A1 EP18731793.8A EP18731793A EP3648865A1 EP 3648865 A1 EP3648865 A1 EP 3648865A1 EP 18731793 A EP18731793 A EP 18731793A EP 3648865 A1 EP3648865 A1 EP 3648865A1
Authority
EP
European Patent Office
Prior art keywords
layer
filter
filter medium
fibers
filter element
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP18731793.8A
Other languages
German (de)
English (en)
Inventor
Jochen Krauss
Christine OPRISCH
Heiko Wyhler
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mann and Hummel GmbH
Original Assignee
Mann and Hummel GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mann and Hummel GmbH filed Critical Mann and Hummel GmbH
Publication of EP3648865A1 publication Critical patent/EP3648865A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
    • F02M25/022—Adding fuel and water emulsion, water or steam
    • F02M25/0221—Details of the water supply system, e.g. pumps or arrangement of valves
    • F02M25/0224—Water treatment or cleaning
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/08—Filter cloth, i.e. woven, knitted or interlaced material
    • B01D39/083—Filter cloth, i.e. woven, knitted or interlaced material of organic material
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
    • A01N25/00—Biocides, pest repellants or attractants, or plant growth regulators, characterised by their forms, or by their non-active ingredients or by their methods of application, e.g. seed treatment or sequential application; Substances for reducing the noxious effect of the active ingredients to organisms other than pests
    • A01N25/34—Shaped forms, e.g. sheets, not provided for in any other sub-group of this main group
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
    • A01N55/00—Biocides, pest repellants or attractants, or plant growth regulators, containing organic compounds containing elements other than carbon, hydrogen, halogen, oxygen, nitrogen and sulfur
    • A01N55/02—Biocides, pest repellants or attractants, or plant growth regulators, containing organic compounds containing elements other than carbon, hydrogen, halogen, oxygen, nitrogen and sulfur containing metal atoms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/14—Other self-supporting filtering material ; Other filtering material
    • B01D39/16—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
    • B01D39/1607—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous
    • B01D39/1623—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous of synthetic origin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/0001—Making filtering elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/0027—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions
    • B01D46/0028—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions provided with antibacterial or antifungal means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/10—Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/52—Particle separators, e.g. dust precipitators, using filters embodying folded corrugated or wound sheet material
    • B01D46/521—Particle separators, e.g. dust precipitators, using filters embodying folded corrugated or wound sheet material using folded, pleated material
    • 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
    • C02F1/004—Processes for the treatment of water whereby the filtration technique is of importance using large scale industrial sized filters
    • 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
    • C02F1/50—Treatment of water, waste water, or sewage by addition or application of a germicide or by oligodynamic treatment
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
    • F02M25/022—Adding fuel and water emulsion, water or steam
    • F02M25/0221—Details of the water supply system, e.g. pumps or arrangement of valves
    • F02M25/0222—Water recovery or storage
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
    • F02M25/022—Adding fuel and water emulsion, water or steam
    • F02M25/025—Adding water
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/04—Additives and treatments of the filtering material
    • B01D2239/0442—Antimicrobial, antibacterial, antifungal additives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/06—Filter cloth, e.g. knitted, woven non-woven; self-supported material
    • B01D2239/0604—Arrangement of the fibres in the filtering material
    • B01D2239/0622—Melt-blown
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/06—Filter cloth, e.g. knitted, woven non-woven; self-supported material
    • B01D2239/0604—Arrangement of the fibres in the filtering material
    • B01D2239/0627—Spun-bonded
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/06—Filter cloth, e.g. knitted, woven non-woven; self-supported material
    • B01D2239/065—More than one layer present in the filtering material
    • B01D2239/0654—Support layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/12—Special parameters characterising the filtering material
    • B01D2239/1258—Permeability
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2275/00—Filter media structures for filters specially adapted for separating dispersed particles from gases or vapours
    • B01D2275/10—Multiple layers
    • 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
    • C02F1/50—Treatment of water, waste water, or sewage by addition or application of a germicide or by oligodynamic treatment
    • C02F1/505—Treatment of water, waste water, or sewage by addition or application of a germicide or by oligodynamic treatment by oligodynamic treatment
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/02—Non-contaminated water, e.g. for industrial water supply
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00—Specific treatment goals
    • C02F2303/04—Disinfection
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00—Specific treatment goals
    • C02F2303/16—Regeneration of sorbents, filters
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00—Specific treatment goals
    • C02F2303/20—Prevention of biofouling

Definitions

  • the invention relates to a filter medium according to the preamble of claim 1, a filter element, a use of the filter element, a method for producing the filter medium and a water injection system.
  • a filter medium which has at least two filtration layers, one of which is equipped with an antimicrobial agent, for example.
  • an antimicrobial agent for example.
  • the second filter layer may, in particular, be a filter layer arranged downstream.
  • DE 10 2013 021 071 A1 discloses a filter medium for the filtration of air in a cabin filter of a motor vehicle.
  • This filter medium has a multilayer structure which has at least one anti-allergenic filter layer, a particle filter layer, one or more activated carbon adsorption layers, and an antibacterial filter layer containing zinc pyrithione as the active ingredient.
  • the above-described filter medium of the prior art is initially due to its structure, which is tailored to the relatively small fan performance and differential pressures in automotive ventilation systems, not for use in fluid systems in which the filter medium usually exposed to a much higher differential pressure is.
  • a cabin air filter medium is not mechanically so strong that it could also be used in fluid systems.
  • the antimicrobial properties of the interior filter medium for liquid systems are not sufficient because the growth of bacteria in the water at several days standstill and summer temperatures of more than 60 ° C in the engine compartment is much higher than in the area of an air duct of the ventilation system.
  • the named form of anti-discrimination microbial effect may be sufficient for air filters for indoor use, but is not suitable for liquid systems.
  • the invention solves this problem by a filter medium having the features of claim 1.
  • the filter medium according to the invention can be used for the filtration of water, for example.
  • a filter element as it is used in a water injection system for internal combustion engines.
  • Such systems typically include a water tank, a pump, one or more filters, a control system, fluid lines, and injectors or nozzles.
  • a control system typically include a water tank, a pump, one or more filters, a control system, fluid lines, and injectors or nozzles.
  • a corresponding filter medium comprises at least a first layer as a support layer and a second layer as a downstream arranged to the first layer filtration layer.
  • the second layer can have a higher dust absorption capacity, in particular an at least two times higher dust absorption capacity, than the first layer.
  • tight-meshed screen meshes or meshes which may consist in particular of plastics, can be used as a support layer. These screen meshes or meshes can be equipped equally with the antimicrobial agent. As a result, a growth of microorganisms, especially bacteria, ie biofilm formation through all filter layers, can be effectively avoided.
  • both the first layer and the second layer have at least one at least antibacterial active ingredient.
  • Antibacterial bacteriostatic properties as well as bactericidal properties are referred to here.
  • the active ingredient can not only be effective against bacteria, but have a bacteriostatic and / or bactericidal as well as fungistatic and / or fungicidal action.
  • bactericidal is meant a bactericidal effect.
  • the bacteria must be killed to a certain extent, preferably at least 99% within the first 4 hours, after their application.
  • bacteriostatic substances have only a growth-inhibiting effect.
  • the active substance may be an active substance from the group comprising pyrithione and / or a metal salt thereof, wherein the metal salt is in particular an alkali metal salt, in particular a sodium salt, an alkaline earth metal salt or a transition metal salt, preferably from the group consisting of zinc, manganese, copper and Iron, is or a Pyrithion derivative and / or a metal salt thereof, wherein the metal salt is in particular an alkali metal salt, in particular a sodium salt, an alkaline earth metal salt or a transition metal salt, preferably from the group zinc, manganese, copper and iron.
  • the metal salt is in particular an alkali metal salt, in particular a sodium salt, an alkaline earth metal salt or a transition metal salt, preferably from the group zinc, manganese, copper and iron.
  • a quaternary ammonium salt of the general formula NR 4 + X - or R NR 2 + X - , wherein R herein denotes an organic radical and wherein R may be the same or different, and R preferably contains at least one alkoxy group general formula -OCH 3, a siloxy group of the general formula R 3 Si-O- or an alkoxysilyl group of the general formula R 1 R 2 R 3 Si-O-R 4 , in particular a Tnalkoxysilylpropyl distr, and wherein X "is an anion is, in particular a halide from the group F, Cl, Br or I.
  • the pyrithione metal salt or pyrithione derivative metal salt may be a zinc salt, especially zinc pyrithione.
  • the quaternary ammonium salt has a trialkoxysilylpropyl group, in particular dimethyltetradecyl [3- (trimethoxysilyl) propyl] ammonium chloride or 3- (tri-methoxysilyl) propyldimethyl octadecyl ammonium chloride.
  • Equipping a plurality of layers, that is to say in particular also the support layer, with the at least antibacterial active substance is initially rather disadvantageous in terms of manufacturing technology than a coating having a surface coating on the surface.
  • the filter medium has the at least one at least antibacterial active ingredient over its entire thickness.
  • By a configuration with support layer advantageously improved pressure resistance is achieved.
  • the first layer and the second layer can each be provided with an active substance-containing impregnation and / or a coating containing active ingredient.
  • an active substance-containing impregnation and / or a coating containing active ingredient in addition, a more homogeneous distribution of the active ingredient, in particular of the zinc pyrithione, over the entire filter level of the layer can be achieved by the impregnation and / or coating.
  • the active ingredient-containing coating and / or impregnation may comprise a binder based on polyacrylate.
  • the binder may be a so-called hydrophobically modified polyacrylate (HASE) or a polyacrylate, which is crosslinked with polyurethane to form a hybrid polymer.
  • HASE hydrophobically modified polyacrylate
  • the active ingredient-containing, in particular zinc pyrithione-containing, polyacrylate coating allows a slow washout of parts of the zinc pyrithione molecules, so that the coating has a depot effect. This is particularly advantageous when the filter medium is used in a filter element of a water injection system, since in a backwash and components of the hydraulic system can be achieved with an at least antibacterial effect, which are spatially separated from the filter element, such as a pump.
  • the second layer may be formed as a nonwoven layer, said nonwoven layer at least 80 wt.% Synthetic fibers, in particular PET fibers, PBT fibers, PA fiber and / or PP fibers and / or PE fibers comprises.
  • the fibers may advantageously be meltblown and / or staple fibers.
  • the air permeability of the filter medium with the coating or impregnation may be 100 to 850 l / m 2 s, preferably 180-700 l / m 2 s.
  • Appropriate conclusions can be drawn on the permeabilities to other media, especially water.
  • the above-mentioned values of the air permeability are to be understood against the background of ISO 9237, which according to the measurement is to be applied with a differential pressure of 200 Pa.
  • the first layer formed as a support layer may in particular have a lattice structure, preferably with a thickness of less than 0.8 mm. Even significantly smaller thicknesses are possible, wherein a minimum thickness is influenced by the strength properties of the material used for the grid.
  • the first layer formed as a lattice structure serves for mechanical stabilization of the second layer, which is especially important when the second layer is a nonwoven layer, and has a drainage function.
  • the first layer may comprise at least 80% by weight of synthetic fibers, in particular PET fibers, PBT fibers, PA fibers and / or PP fibers and / or PE fibers.
  • the filter medium in addition to the at least two aforementioned layers at least one third layer, in particular a spunbond layer, which is formed downstream of the second layer, wherein the third layer is formed as a support layer.
  • the third layer may in particular be formed with a lower dust absorption capacity, in particular with at least a two times lower dust absorption capacity than the second layer.
  • the second layer which is formed as a filtration layer, quasi sandwiched between the two support layers, first layer and third layer, added. This has the advantage that the filtration layer can be optimally supported in both possible directions of flow. When using the filter medium in a filter element of a water injection system, this is advantageous since reversing the flow direction can occur for backwashing system components such as the injection nozzles / valves and / or the pump.
  • each layer of the filter medium now has an active substance-containing impregnation and / or an active substance-containing coating. This is particularly advantageous to ensure that no germ load in intermediate layers or supporting layers on the clean or raw side builds.
  • each layer of the filter medium, the two, three or more layers, is individually provided with the active ingredient. The layers can also be penetrated by the active ingredient in each case.
  • the ratio between the concentration of zinc pyrithione and the concentration of binder in the impregnation and / or coating can therefore be adjusted by a laboratory assistant or an engineer for paints and varnishes by routine work such that at least 0.1% by weight of zinc pyrithione is present h in water at 65 ° C from the coating and / or impregnation is ausschwemmbar.
  • the first layer may have a smaller thickness, in particular a thickness at least 1.5 times smaller, than the second layer.
  • the second layer formed as a filtration layer is to be selected such that dust particles or microbes having a size of 10 ⁇ m are also retained quantitatively, that is to say more than 95%, in particular more than 99%.
  • a corresponding specification regarding the size of the dust particles to be filtered is given in the product data sheet for most commercially available filter media.
  • the first layer may have a lower weight per unit area, in particular a surface weight that is at least 1.2 times lower than the second layer. Overall, the first layer is only the support of the second layer, which can take over the actual task of particle separation from the water. However, even on the larger surfaces of a grid or other support structures microbes can accumulate and spread, which is why this has at least one at least antibacterial active ingredient.
  • a filter element which may be formed as a round filter element or flat filter element.
  • the filter element has a filter media pack from the filter medium according to the invention.
  • the filter media pack may in particular be a folded filter media pack, which may, for example, have a star fold to form a cylindrical filter element.
  • the filter element is preferably a water filter element of a water injection system for an internal combustion engine or gas turbine.
  • the filter element may have at least one end plate, which is materially connected to the filter media pack, for example, may be welded.
  • the filter element may also have two end disks, for example a closed and an open end disk or two open end disks, the filter element design depending on the fluid system intended for use.
  • Other filter designs are known in the art.
  • Another aspect of the invention relates to a use of the filter element in a pre-filter and / or a main filter of a fluid line of a water injection system of an internal combustion engine and / or a gas turbine.
  • both the prefilter and the main filter can have a filter element according to the invention, so that biofilm formation threatens neither in the prefilter nor in the main filter.
  • the injection nozzles and / or valves of the water injection system can be even more reliably protected against contamination.
  • the pre-filter may comprise a housing and a filter element disposed in the housing.
  • An inventive method for producing the filter medium comprises the steps of providing the individual layers, the single coating and / or individual impregnation of each layer with the active ingredient, in particular a Zinkpyrithionates, and a subsequent assembly to the filter medium.
  • the padding process with a subsequent drying can be used, wherein the drying can be carried out at room temperature or at elevated temperature, for example 100 ° C. or more.
  • an aqueous solution in which the active ingredient is dissolved can be used.
  • the solution o. G. Containing polyacrylates, which are incorporated therein as the finest particles or powder and improve the adhesion of the active ingredient to the layers / fibers.
  • a final aspect of the invention relates to a water injection system for an internal combustion engine having a water tank and at least one injection device, for example with one or more injection nozzles or valves.
  • the injection device is fluidly connected to the water tank, wherein in a Fluid line between the water tank and the at least one injection device is present at least one filter element, which is a filter element according to the invention.
  • FIG. 1 shows a schematic and simplified circuit diagram of the fluid line in a commercial vehicle
  • FIG. 2 shows a schematic structure of a first filter medium
  • Fig. 3 shows a schematic structure of a second filter medium.
  • FIG. 1 shows in a simplified manner the structure of a medium line of a water injection system of an internal combustion engine with a fluid flow of water in the flow direction 100.
  • a heatable water tank 2 with a refill 1 and a sensor 3 for determining the water quality, the level and / or the temperature ,
  • the water tank 2 has a first supply line 1 1 to a water tank in the flow direction 100 downstream pump module 5.
  • the pump module 5 can, as shown in Fig. 1, be provided with a shut-off valve, a diaphragm, a check valve, a pressure sensor and an optional heater.
  • the supply line 1 1 a pre-filter 4. This filters dirt particles in the order of greater than 25 ⁇ from the fluid flow.
  • a second supply line 6 forwards the fluid further to a nozzle arrangement 9 downstream of the pump module 5 in the flow direction 100.
  • a nozzle arrangement 9 downstream of the pump module 5 in the flow direction 100.
  • the injection of water into a piston engine or a gas turbine of the internal combustion engine can take place.
  • the medium pressure when the medium is fed into the nozzle arrangement 9 can be checked.
  • the second supply line 6 has a main filter 7, which protects the nozzle assembly 9 from clogging or contamination.
  • the main filter 7 is also often described as a fine filter. It serves to filter particles with a particle size larger than 9 ⁇ m from the fluid stream.
  • the maximum loading of the prefilter 4 and the fine filter 4 is preferably at least 10 grams, preferably at least 12 grams.
  • the pressure drop of the prefilter 4 in the conveying direction 100 is preferably at most 100 mbar at a flow rate of 1 10 l / h.
  • the pressure drop of the fine filter or main filter 7 is preferably at most 500 mbar at a flow rate of 80 l / h.
  • FIG. 2 shows the structure of a filter medium 200 according to the invention for use in a pre-filter 4 and / or main filter 7.
  • the filter medium 200 has at least one first layer 201 and at least one second layer 202.
  • the first layer 201 of the filter medium 200 is the inflow-side layer, as can be seen in FIG. 2 on the basis of the flow direction 100.
  • the first layer 201 is a support layer and may be formed as a nonwoven layer or as a grid layer.
  • the vast majority of the fibers of the first layer 201 are formed from a synthetic plastic. In the case of a nonwoven layer, for example, these may preferably be PBT fibers (polybutylene terephthalate fibers).
  • the grid may be formed on a PBT basis.
  • the first layer 201 may have a weight per unit area of less than 130 g / m 2 , in particular between 70 and 110 g / m 2 .
  • the average thickness of the second layer 202 may in particular be less than 0.7 mm, in particular between 0.4 and 0.6 mm.
  • the second layer 202 is a filtration layer and is formed as a nonwoven layer.
  • the vast majority of fibers of the second layer may advantageously be PET fibers.
  • the second layer 202 may have a weight per unit area of more than 140 g / m 2 , in particular between 1 60 and 180 g / m 2 .
  • the average thickness of the second layer 202 may be more than 0.8 mm, in particular between 0.9 to 1, 2 mm.
  • the average fiber diameter is 4 to 40 ⁇ . The data regarding thickness and fiber diameter can be determined microscopically.
  • the filter medium 200 may be provided in a zigzag fold in a filter element.
  • the filter medium 200 may be arranged in the filter element as a hollow cylindrical bellows with a star-shaped cross-section. The bellows is limited at each of its two end faces by one end plate.
  • a filter element of the type described above is disclosed, for example, in DE 10 201 6 008 502 A1, to which reference is made in full, in particular with regard to the construction of a filter element in the context of the present invention.
  • both the first layer 201 and the second layer 202 have an at least antibacterial active ingredient, which according to this exemplary embodiment is zinc pyrithione.
  • the active substance here zinc pyrithione, can be applied in the form of a coating or impregnation 204 on the fibers of the first and the second layer 201, 202. arranges or penetrate the layers so that the layers are so to speak soaked in the drug.
  • the replacement of the filter medium of the prefilter 4 can take place in a water injection system, for example, every 15 years.
  • FIG. 3 shows the structure of a filter medium 300 for the main filter 7, which of course can also be used for the pre-filter 4 in other applications.
  • the filter medium 300 is constructed with at least three layers with a first layer 301, a second layer 302 and a third layer 303.
  • the first layer 301 of the main filter 7 is an upstream side. It may be formed analogously to the first layer 201 of the prefilter 4, in particular with regard to the basis weight and the thickness of the layer. It is designed as a support layer and may consist of a grid material and / or a nonwoven material. The fibers or the lattice structure of the first layer may be formed of at least 80% by weight of PBT material.
  • the second layer 302 of the filter medium 300 is preferably designed as a fine filter. It may be a nonwoven layer of meltblown fibers. The majority of meltblown fibers may be particularly preferably formed as PBT fibers. Compared with cellulose fibers, PBT meltblown fibers have a more than fourfold increased dust storage capacity under analogue measuring conditions.
  • the second layer 302 may have a weight per unit area of more than 130 g / m 2 , in particular between 140 and 180 g / m 2 .
  • the average thickness of the second layer 302 may be more than 0.8 mm, in particular between 0.9 to 1, 1 mm.
  • the average fiber diameter is 0.1 to 10 ⁇ .
  • the data regarding thickness and fiber diameter can be determined microscopically.
  • the third outflow-side layer 303 may also be formed as a support layer, namely as a nonwoven layer.
  • This layer 303 may preferably be formed as a spunbond layer.
  • the spunbond layer has a lower layer thickness, preferably an at least 1.5 times smaller layer thickness, than the first and second layer 301 and 302 arranged above it. At least 80% PET fibers can be used as the spunbond fiber material.
  • the outflow-side layer 303 may also be formed as a support layer.
  • the bung bond layer on the one hand allows drainage and gives the filter medium 300 a higher overall rigidity.
  • the zinc pyrithione coating or impregnation is shown as reference 304 in FIG.
  • the totality of the filter medium 300 of the main filter 7 has an initial degree of precipitation determined by particle counting in accordance with ISO 19438: 2003-1 1 of more than 99.5% for particles having a particle size greater than 10 ⁇ m.
  • the totality of the filter medium 300 of the main filter 7 has a dust storage capacity of 100 g / m 2 at 300 mbar when loaded with a stream of air with 50 mg / l of dust and with a flow distribution of 0.1 6 l / cm 2 h according to ISO 19438: 2003 -1 1 on.
  • the high dust storage capacity allows the filter to be replaced in a replacement interval of two years or more in a commercial vehicle.
  • the filter medium 300 of the main filter may be arranged analogously to the filter medium 200 of the prefilter in a filter element or alternatively be folded in a flat filter element or arranged unfolded in a planar frame structure.
  • the air permeability of the filter medium 200 of the prefilter 4 according to ASTM D 737 is preferably at least three times as large as the air permeability of the filter medium 300 of the main filter 7.
  • the air permeability of the filter medium 200 prefilter 4 at 200 Pa may be between 150 to 250 l / m 2 / s, the air permeability of the filter medium with respect to a filter medium with analog structure and under analog measurement conditions but with uncoated and / or unimpregnated layers slightly decreases.
  • the thickness of the filter medium 200 of the prefilter 4 is preferably 0.25 to 0.4 mm at a pressure of 0.5 kPa.
  • the air permeability of the filter medium 300 main filter 7 at 200 Pa can be between 500 to 850 l / m 2 / s, wherein the air permeability of the filter medium with respect to a filter medium with analog structure and under analog measurement conditions but slightly increases with uncoated and / or unimpregnated layers.
  • the thickness of the filter medium 200 of the prefilter 4 is preferably 0.8 to 2.0 mm at a pressure of 0.5 kPa.
  • the coating or impregnation is applied to the fibers of the layers as part of a padding process, also known as full bath impregnation.
  • the layers are first passed through a bath with impregnating or coating agent.
  • the so-called fleet is arranged, which has the zinc pyrithione.
  • the bath temperature may preferably be 40-60 ° C and the exposure time about 20 to 30 min.
  • the filter medium can be pressed out.
  • a drying process or a condensation process of the filter medium 200, 300 take place.
  • the drying process can be carried out at 120 ° C and the condensation process at 140 ° C for about 2 minutes each.
  • the liquor also comprises water and a hydrophilic binder system, preferably based on polyacrylate, which binds the zinc pyrithione to the fibers of the respective layers.
  • the layers are preferably individually impregnated and / or coated in the production and then deposited one above the other to provide the filter medium according to the invention.
  • the concentration of zinc pyrithione in the liquor may preferably be between 5 to 20 g / l.
  • concentration of zinc pyrithione per kg of nonwoven material may preferably be at least 2 g, more preferably 4-20 g.
  • the electrical conductivity of the solution should be less than 200.
  • filter media 200 and 300 The antibacterial activity of filter media 200 and 300 was determined according to test method AATCC 100: 2012. The filter medium was placed in bacterial contact at 37 ° C for 20 h. The test organisms used were Staphylococcus aureus (according to ATCC 6528) and Escherichia coli (according to ATCC 1 1 229). Both germs showed for filter media exclusively with PBT fibers an antibacterial activity of more than 99.4%, in particular from 99.4 to 99.99%.
  • the antifungal activity was determined in the form of the so-called mildew resistance test (AATCC 30-III - 2013).
  • the test fungus used was Aspergillus niber (ATCC 6275) and Chaetomium globosum (ATCC 6205).
  • the incubation period was 7 days at 28 ° C and more than 90% humidity.
  • the impregnated filter media showed no growth in the study.
  • the antibacterial and antifungal study showed excellent results for the effect of the filter media 200 and 300.
  • the layers of the prefilter and the main filter were always described in the examples with PBT fibers or PET fibers.
  • the layers may also comprise polyamide fibers or polypropylene fibers.

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  • Engineering & Computer Science (AREA)
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  • Life Sciences & Earth Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
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Abstract

L'invention concerne un milieu filtrant (200, 300), en particulier pour la filtration d'eau, comprenant au moins une première couche (201, 301) en tant que couche support et une deuxième couche (202, 302) en tant que couche de filtration disposée en aval par rapport à la première couche (201, 301), la première couche (201, 301) et la deuxième couche (202, 302) présentant au moins un principe actif au moins antibactérien. L'invention concerne en outre un élément filtrant, une utilisation de l'élément filtrant et un procédé de fabrication du milieu filtrant. L'invention concerne enfin un système d'injection d'eau équipé d'un élément filtrant selon l'invention.
EP18731793.8A 2017-07-07 2018-06-12 Milieu filtrant et procédé de fabrication, élément filtrant, utilisation de l'élément filtrant et système d'injection d'eau Withdrawn EP3648865A1 (fr)

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DE102017006462.8A DE102017006462A1 (de) 2017-07-07 2017-07-07 Filtermedium und Herstellverfahren, Filterelement und Verwendung des Filterelements
PCT/EP2018/065454 WO2019007642A1 (fr) 2017-07-07 2018-06-12 Milieu filtrant et procédé de fabrication, élément filtrant, utilisation de l'élément filtrant et système d'injection d'eau

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US (1) US20200217275A1 (fr)
EP (1) EP3648865A1 (fr)
CN (1) CN110831685A (fr)
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WO (1) WO2019007642A1 (fr)

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FR3107655B1 (fr) * 2020-02-28 2022-02-11 Sogefi Filtration Spa Agencement de filtration et utilisation d’un dispositif de filtration, avec fonction anti-bulles, pour epurer une eau destinee a une chambre de combustion d’un vehicule
CN111686514A (zh) * 2020-06-19 2020-09-22 雅弦科技有限公司 一种过滤材料及其制备方法、过滤装置及新风系统
CN111789054A (zh) * 2020-07-29 2020-10-20 辽宁省海洋水产科学研究院 一种芽孢杆菌菌液应用于刺参苗种培养的方法
US20220047978A1 (en) * 2020-08-13 2022-02-17 Mann+Hummel Life Sciences & Environment Holding Singapore Pte. Ltd. Anti-microbial, anti-allergenic bio-functional air filter medium for residential air filtration and air filter element
CN113046922A (zh) * 2021-02-23 2021-06-29 丹视(上海)智能科技有限公司 用以制作抗菌抗病毒熔喷布的设备及实现方法
DE202022105638U1 (de) 2022-10-06 2022-10-25 Mahle Gmbh Filtermedium

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ES2245875B1 (es) * 2004-03-26 2006-11-16 Joaquin Espuelas Peñalva Proceso de fabricacion y filtro de tejido no tejido y/o de laminas o estructuras inyectadas filtrantes obtenidos por dicho proceso para la filtracion y eliminacion de la legionella pneumofila.
EP1914274A4 (fr) * 2005-07-15 2011-01-26 Sanc Salaam Corp Composition de polymère thermoplastique à libération prolongée et produit comprenant celle-ci
US20070269643A1 (en) * 2006-05-16 2007-11-22 James Calvin Bennett Antimicrobial pool filter
JP2008095266A (ja) * 2006-10-12 2008-04-24 Hodai Lee ナノ素材を用いた複合繊維フィルター、ナノ素材を用いた複合繊維フィルターの製造装置及びナノ素材を用いた複合繊維フィルターの製造方法
US8678201B2 (en) * 2010-06-04 2014-03-25 Goodrich Corporation Aircraft potable water system
DE102011104628A1 (de) * 2011-06-06 2012-12-06 Mann + Hummel Gmbh Antimikrobielles Filtermedium und Filtermodul
US20140332459A1 (en) * 2013-05-10 2014-11-13 Goodrich Corporation Biocide-loaded electrospun nanofibers supported by adhesive-free thin fabric for pathogen removal filtration
DE102013021071A1 (de) 2013-12-18 2015-06-18 Mann + Hummel Gmbh Filtermedium, Filterelement und Filteranordnung
DE102014002033A1 (de) * 2014-02-13 2015-08-13 Hydac Fluidcarecenter Gmbh Filterelement und Verfahren zum Herstellen eines Filtermediums für ein solches Filterelement
DE102016008502A1 (de) 2016-07-15 2017-06-01 Mann + Hummel Gmbh Filterelement und Verfahren zur Herstellung desselben

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US20200217275A1 (en) 2020-07-09
WO2019007642A1 (fr) 2019-01-10
DE102017006462A1 (de) 2019-01-10
CN110831685A (zh) 2020-02-21

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