EP2935679A1 - Appareil ménager à circulation d'eau pourvu d'une surface intérieure à nettoyer, et procédé permettant le fonctionnement dudit appareil ménager - Google Patents

Appareil ménager à circulation d'eau pourvu d'une surface intérieure à nettoyer, et procédé permettant le fonctionnement dudit appareil ménager

Info

Publication number
EP2935679A1
EP2935679A1 EP13805916.7A EP13805916A EP2935679A1 EP 2935679 A1 EP2935679 A1 EP 2935679A1 EP 13805916 A EP13805916 A EP 13805916A EP 2935679 A1 EP2935679 A1 EP 2935679A1
Authority
EP
European Patent Office
Prior art keywords
water
household appliance
polymer
switchable
biofilm
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Withdrawn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
EP13805916.7A
Other languages
German (de)
English (en)
Inventor
Andreas Bischof
Andreas Hanau
Hartmut Schaub
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.)
BSH Hausgeraete GmbH
Original Assignee
BSH Hausgeraete 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 BSH Hausgeraete GmbH filed Critical BSH Hausgeraete GmbH
Publication of EP2935679A1 publication Critical patent/EP2935679A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F39/00—Details of washing machines not specific to a single type of machines covered by groups D06F9/00 - D06F27/00 
    • D06F39/02—Devices for adding soap or other washing agents
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/0018—Controlling processes, i.e. processes to control the operation of the machine characterised by the purpose or target of the control
    • A47L15/0057—Cleaning of machines parts, e.g. removal of deposits like lime scale or proteins from piping or tub
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F35/00—Washing machines, apparatus, or methods not otherwise provided for
    • D06F35/005—Methods for washing, rinsing or spin-drying
    • D06F35/008—Methods for washing, rinsing or spin-drying for disinfecting the tub or the drum
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F37/00—Details specific to washing machines covered by groups D06F21/00 - D06F25/00
    • D06F37/26—Casings; Tubs
    • D06F37/261—Tubs made by a specially selected manufacturing process or characterised by their assembly from elements
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F58/00—Domestic laundry dryers
    • D06F58/20—General details of domestic laundry dryers 
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D21/0001—Recuperative heat exchangers
    • F28D21/0014—Recuperative heat exchangers the heat being recuperated from waste air or from vapors
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/42—Details
    • A47L15/4214—Water supply, recirculation or discharge arrangements; Devices therefor
    • A47L15/4219—Water recirculation
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/42—Details
    • A47L15/4246—Details of the tub
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/42—Details
    • A47L15/4291—Recovery arrangements, e.g. for the recovery of energy or water
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/42—Details
    • A47L15/48—Drying arrangements
    • A47L15/483—Drying arrangements by using condensers
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L2301/00—Manual input in controlling methods of washing or rinsing machines for crockery or tableware, i.e. information entered by a user
    • A47L2301/04—Operation mode, e.g. delicate washing, economy washing, reduced time, sterilizing, water softener regenerating, odor eliminating or service
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L2401/00—Automatic detection in controlling methods of washing or rinsing machines for crockery or tableware, e.g. information provided by sensors entered into controlling devices
    • A47L2401/11—Water hardness, acidity or basicity
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L2401/00—Automatic detection in controlling methods of washing or rinsing machines for crockery or tableware, e.g. information provided by sensors entered into controlling devices
    • A47L2401/12—Water temperature
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L2401/00—Automatic detection in controlling methods of washing or rinsing machines for crockery or tableware, e.g. information provided by sensors entered into controlling devices
    • A47L2401/20—Time, e.g. elapsed operating time
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L2401/00—Automatic detection in controlling methods of washing or rinsing machines for crockery or tableware, e.g. information provided by sensors entered into controlling devices
    • A47L2401/22—Number of operational cycles
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L2501/00—Output in controlling method of washing or rinsing machines for crockery or tableware, i.e. quantities or components controlled, or actions performed by the controlling device executing the controlling method
    • A47L2501/16—Sterilisers
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L2501/00—Output in controlling method of washing or rinsing machines for crockery or tableware, i.e. quantities or components controlled, or actions performed by the controlling device executing the controlling method
    • A47L2501/26—Indication or alarm to the controlling device or to the user
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L2501/00—Output in controlling method of washing or rinsing machines for crockery or tableware, i.e. quantities or components controlled, or actions performed by the controlling device executing the controlling method
    • A47L2501/34—Change machine operation from normal operational mode into special mode, e.g. service mode, resin regeneration mode, sterilizing mode, steam mode, odour eliminating mode or special cleaning mode to clean the hydraulic circuit
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L2501/00—Output in controlling method of washing or rinsing machines for crockery or tableware, i.e. quantities or components controlled, or actions performed by the controlling device executing the controlling method
    • A47L2501/36—Other output
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F39/00—Details of washing machines not specific to a single type of machines covered by groups D06F9/00 - D06F27/00 
    • D06F39/006—Recovery arrangements, e.g. for the recovery of energy or water
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F39/00—Details of washing machines not specific to a single type of machines covered by groups D06F9/00 - D06F27/00 
    • D06F39/20—Arrangements for water recovery
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F58/00—Domestic laundry dryers
    • D06F58/20—General details of domestic laundry dryers 
    • D06F58/24—Condensing arrangements

Definitions

  • the invention relates to a water-conducting household appliance with an inner surface and a method for its operation.
  • the invention relates to a water-conducting household appliance with a treatment container for receiving objects to be treated and at least one inner surface.
  • biofilms are frequently formed in the area of components with permanently moist surfaces.
  • "Permanently moist surfaces” are in this case those which come into contact with water or aqueous liquids during proper operation of the household appliance.
  • biofilms form on an interface, for example to a solid phase, and consist of a thin layer of mucus in which The microorganisms surround themselves with extracellular polymeric substances (EPS) to protect against external attacks and to improve their living conditions.
  • EPS extracellular polymeric substances
  • biofilms that form, for example, in the Ein Auchschale and in areas of the tub of household appliances, create a hygienic, aesthetic and / or odor problem.
  • the sanitation of storage water that is stored in some home appliances for re-use in later process steps can be of concern if the total bacterial count in the water, which directly correlates with the strength of the biofilm, becomes too great.
  • biofilms on surfaces of water-bearing household appliances should therefore be avoided as far as possible.
  • already existing biofilms should be combated and if possible eliminated.
  • biocide equip, for example, a Ein Hughesschale a washing machine.
  • Biocidally-treated surfaces do not permanently prevent the formation of a biofilm because only the germs that are in direct contact with the surface that absorb the biocide die. Other germs that settle on the dead germ can often survive and multiply.
  • biocidal chemical substances acting on the outside of a biofilm generally kill only the upper germinal layers. The deeper layers are often not reached because they are protected by the EPS.
  • chemical cleaners require use with a high concentration and with a long exposure time.
  • biocides or chemicals or their reaction products are often harmful to the environment and / or harmful to health and can cause allergies, for example.
  • Another problem is that a repeated use of biocides can lead to the formation of resistance of the microorganisms, whereby the control of microorganisms is further complicated.
  • DE 3841596 A1 describes a method for reducing the formation of slime and deposits in installations in which water circulates. In the process, non-sessile microorganisms which compete with biofilm-forming microorganisms for nutrient competition and thus reduce the formation of a biofilm are supplied to the circulating water.
  • EP 1 350 575 B1 describes a surface with switchable ultrahydrophobia and a process for the realization.
  • the surface is a rough surface with a switchable intrinsic wettability, wherein in the context of the switching a reversible transition to a composite surface in the sense of the Cassie-Baxter theory takes place, comprising a substrate which is provided with a thin layer with switchable wettability.
  • the intrinsic wettability is switched by temperature variation, pH Variation, electric fields or contact with selective solvents.
  • the thin layer preferably consists of at least one hydrophilic and one hydrophobic component, which are enriched alternately on the surface by phase separation.
  • the thin film can be designed as a multi-component polymer brush and the phase separation can be realized by contact with selective solvents for the components thereof.
  • Switchable polymer surfactants are described in the Fraunhofer IAP Annual Report 2003 on pages 66 and 67.
  • the object of the present invention was to provide a water-conducting domestic appliance in which the avoidance of training and the control of biofilms is improved. In particular, the removal of biofilms should be facilitated.
  • the object of the invention was also to provide a method for operating such a household appliance.
  • biofilm is used herein to refer to a biofilm as such, as well as a non-biofilm-forming, more or less accumulated microorganism on an interior surface of the domestic water-conducting appliance.
  • the invention thus relates to a water-conducting household appliance with a treatment container for receiving objects to be treated and at least one inner surface, wherein the inner surface comprises a coating with a switchable polymer.
  • coating is here to be interpreted broadly, which covers more or less thin coatings of other materials, for example of metals or of other polymers.
  • a component of a household appliance which has such an inner surface, have a switchable polymer or
  • coating with a switchable polymer broadly means that at least one inner surface of the component has a coating with a switchable polymer.
  • the coating can also consist in that on the inner surface, for example, can be located polymer chains which are more or less close to the inner surface, as long as at least one end of these polymer chains is anchored to the surface. Anchored can be a chemical or physical connection.
  • switchable polymer means that the polymer has at least two distinct states, which states are generally characterized by different internal or superficial structures that can be interposed between those in the water-bearing domestic appliance, that is, switching may occur Switching operation can be carried out, in which the polymer is transferred from a first state to a second state, in which a biofilm adheres poorly to the polymer compared to the first state Preferably, this switching process can be carried out reversibly, so that according to the invention preferably reversibly switchable polymers used In a preferred embodiment of the water-conducting domestic appliance, a structure of the switchable polymer can be switched by changing the external chemical and / or physical conditions e temperature, pH, ionic strength and / or pressure.
  • the chemical conditions include the performance of a chemical reaction selected from the group consisting of a protonation-deprotonation reaction, a dissociation reaction, a rearrangement and an oxidation or reduction process.
  • a chemical reaction selected from the group consisting of a protonation-deprotonation reaction, a dissociation reaction, a rearrangement and an oxidation or reduction process.
  • a change in temperature such as a heating of the switchable polymer
  • a switchable polymer having inner surface such as a dispenser
  • be rinsed with sufficiently warm water as an example of a rinsing liquid or by switching sufficiently heated by embedded in the switchable polymer heating wires can be combined by a temperature change.
  • Heating with a warm rinsing liquid such as water or another aqueous rinsing liquid mixed with a cleaning agent, has the advantage that a biofilm which adheres poorly after a switching operation can be detached due to the mechanical action of the flowing rinsing liquid and, finally, even be washed away.
  • a superficial structure of the switchable polymers and thus a property of the surface are switchable.
  • the property may be, for example, the hydrophilicity of the inner surface, which generally differs by a more or less large wettability with an aqueous liquid and / or a more or less large adherence of microorganisms and thus biofilms, or size and / or roughness of the inner surface.
  • the interior of the coating with switchable polymers can be designed such that the structure of the interior also changes during a switching operation.
  • it is also possible in particular to store biocidal substances in the coating which can reach the surface more quickly and thus a biofilm after a switching operation. This would be an example of a controlled-release process by the inventive use of switchable polymers.
  • the coating can be relatively thin according to the invention.
  • the coating has a thickness of at most 5 ⁇ , more preferably of at most 2 ⁇ and most preferably of at most 1 ⁇ .
  • the water-conducting household appliance according to the invention is not particularly limited. All water-conducting household appliances, in which due to the presence of Water biofilms can form and in which therefore an avoidance, reduction and / or elimination of biofilms is desired, are suitable according to the invention, wherein the household appliance may in particular contain a water supply. Particularly preferred according to the invention is a dishwashing machine, a washing machine, a washer-dryer or a dryer, in particular a condensation dryer.
  • a condensation dryer is a dryer in which a moist, warm process air from a drying chamber as a treatment chamber, which contains wet laundry, is removed by condensation in the moist warm process air water containing. The condensate is temporarily stored and / or discharged from the dryer, which is why a dryer is understood as a water-conducting household appliance.
  • the household appliance according to the invention comprises a treatment container for receiving objects to be treated, such as e.g. Clothes or dishes on. Often the treatment tank is therefore a drum.
  • the term "treating" includes in particular a washing or drying of the objects to be treated.
  • the household appliance according to the invention is a washing machine with a tub, a drum, a water inlet system and a lye drain system with a drain pump and a control device.
  • a water-conducting household appliance which has a water reservoir for water used in the household appliance.
  • a used aqueous liquid is stored for reuse as storage water and thus recycled.
  • water from the last rinse which is relatively clean, is suitable for this purpose.
  • a water reservoir can be fed with water from various sources and depending on the exclusive or preferred source of water, for example, a condensate collection tank, a soft or hard water tank and / or a flushing water storage.
  • the water reservoir is preferably a rinse water storage.
  • the rinse water storage usually used rinse water is cached, for example, in the to be reused following wash cycle.
  • the water reservoir is preferably a condensate collecting container for the condensate produced during the drying of moist air, for example a condensate tray arranged below a heat exchanger.
  • the water storage can also be a soft water tank or a hard water tank, for example, if a washing machine has a desalination device.
  • the water reservoirs mentioned are susceptible to the formation of biofilms, and thus the design of an inner surface with a coating of a switchable polymer is very advantageous.
  • the design of an inner surface with a coating of a switchable polymer is very advantageous.
  • the sanitary requirements can be guaranteed.
  • the water-conducting domestic appliance comprises a control device which is set up such that a switching process, for example, automatically or by a command of a user.
  • an inner surface in a water-conducting household appliance is not particularly limited and may be any inner surface located within such a household appliance, for example, surfaces of plastic, metal, rubber, etc.
  • the surface is a permanently moist inner surface.
  • a "permanently moist inner surface” is, in particular, a surface located in the interior of the household appliance, which comes into contact with water or an aqueous liquid during normal operation of the household appliance.
  • the permanently moist inner surface comprises a Ein Hughesschale, an inner tub wall, a water reservoir, a water supply line, a heat exchanger surface and / or a condensate tray.
  • inner tub container wall preferably means the rear area of the drum mount, which tends to form biofilms in particular.
  • a switching operation in the sense of the invention may take different lengths, wherein in the duration of the switching operation, as understood herein, in addition to the duration of the actual switching operation is switched by the between two states of the switchable polymer, in general, the time for maintenance of the second state is included.
  • the switchable polymers used are not restricted according to the invention, as long as a switching operation can be carried out in a water-conducting household appliance, which leads to the fact that the adhesion of a biofilm is deteriorated.
  • the chemical nature of the switchable polymer will depend in particular on the type of triggering of the switching operation, ie in particular on the nature of the change in the external physical or chemical conditions.
  • intrinsically conductive polymers such as unsubstituted or substituted polythiophenes, polypyrroles and / or polyvinylaromatics can be used as switchable polymers.
  • polymer surfactants metal colloids, partially acylated polytrisacrylamides, poly (styrenesulfonate) -block-poly (acrylamide),
  • a switchable polymer may be a polymer brush of at least two very different polymers in which one end is firmly bound to the material of a component of the household appliance. Depending on the external conditions, these different polymers can then accumulate alternately on the surface, so that the surface properties are each determined by one or the other polymer. You can switch between these states. Methods for preparing such polymers are described, for example, in Minko, S. (ed.): Responsive Polymer Materials. Arnes: Blackwell Publ., 2006.
  • the coating consists of polymer chains grafted onto the surface of at least two different polymers or comprising these.
  • these are incompatible, so that there is a segregation or a spatial separation of these polymer chains.
  • different polymers can be located in one surface, wherein the polymer chains do not substantially protrude from the surface.
  • the invention further relates to a method for operating a water-conducting domestic appliance with a water supply and a treatment container for receiving objects to be treated and at least one inner surface, wherein the inner surface comprises a coating with a switchable polymer, comprising the step
  • the switching between the first and second structures and back is performed sufficiently frequently and / or sufficiently long so that the surface properties of the switchable polymer are sufficiently changed by the change in physical and / or chemical external conditions to provide adhesion of biofilms.
  • the change in physical and / or chemical conditions is a change in temperature or pH.
  • the method according to the invention can be carried out at different times, for example as a method separate from a treatment method in a water-conducting domestic appliance.
  • a switching operation is carried out while a treatment program is carried out in the water-bearing household appliance with the objects to be treated in the storage container.
  • the inner tub wall is heated in the rear region of the storage, which tends to form biofilms, due to the movement of the drum.
  • the heating during spin is very pronounced.
  • a circuit of the switchable polymer are triggered.
  • a less well-adherent biofilm can then be detached and removed together with rinsing liquid.
  • a drum of a washing machine is operated at a preferably increased water level with high drum speeds.
  • a biofilm present in particular in the rear tub area can be effectively eliminated.
  • the heat exchanger is populated with a biofilm.
  • the temperature of the heat exchanger can be appropriately raised, so that a switching operation is triggered and, as a result, the adhesion of a biofilm is degraded. Even if then by passing a refrigerant through the heat exchanger, the temperature drops again and thus restored by switching the original state, the adhesion of the biofilm may have deteriorated so that it can be washed away by means of the resulting condensate in the heat exchanger.
  • Another possibility for triggering a switching process is a change in the pH, for example from neutral to basic. This can be achieved, for example, by the action of an alkaline solution, for example a wash liquor, on the switchable polymer.
  • This switching process can also be triggered during a wash program when, for example, an alkaline detergent is used in a wash program.
  • the contact time of the alkaline solution is so timed or sensor-controlled, that the alkalis penetrate a biofilm once formed and reach the switchable coating.
  • a biofilm formed therein during the downtime of the washing machine as an example of a water-conducting household appliance according to the invention would then be removed when the washing program is carried out again.
  • the switching of the switchable polymer can also be effected by a change in the ionic strength in a solution or aqueous liquid in contact with the switchable polymer.
  • the ionic strength of a solution can be increased, for example, by the addition of salts.
  • a change in the ionic strength can therefore be made particularly advantageous in such water-conducting domestic appliances, in which a solution with a high ionic strength can be easily provided.
  • These are in particular dishwashers in which a regeneration solution of a water softener is used, and washing machines and washer-dryers with a device for desalting the water used therein.
  • a solution with a high salt concentration usually also occurs.
  • it is generally useful to specify a minimum contact duration of the solution used for switching so that a sufficient reduction of the adhesion of the biofilm can be ensured.
  • a relationship between the minimum contact duration and size and type of biofilm so that the minimum contact duration can be adjusted depending on a detected biofilm.
  • aqueous liquid generally a solution
  • static contact it is also possible to realize a dynamic contact in that a solution at the the inner surface to be switched past continuously or discontinuously.
  • a switching operation can also be effected by performing a chemical reaction on the inner surface.
  • a chemical reaction on the inner surface.
  • the change in the structure of the switchable polymer brought about by the switching process then consists in the fact that the oxidized / reduced and neutral form, in particular also those properties which result in a reduction of the adhesion of a biofilm
  • Such a redox reaction can for example be brought into contact with the surface to be cleaned with an oxidizing agent such as ozone, gaseous or dissolved in water, or In this way, a biofilm can be detached by, on the one hand, a chemical attack on the biofilm as such happens and on the other hand, the oxidizing agent causes the switching of the switchable polymer.
  • a redox reaction can also be used advantageously in particular if electrically conductive polymers are present in the surface.
  • Suitable electrically conductive polymers are derived, for example, from substituted or unsubstituted polythiophenes, polypyrenes, polyphenylenes and polyvinylaromatics.
  • a change in the oxidation state of the polymer can be effected by electrical or chemical means, wherein the different oxidation states generally differ in their structure and electrical conductivity.
  • electrically conductive polymers in the oxidized state a chemical coupling system which is asconjugated as possible is present.
  • electrically conductive polymers for example, one of the aforementioned chemical oxidants such as ozone or hypochlorite can be used.
  • the electrically conductive polymers can also be connected to a power supply, so that their structural and electrical properties can be selectively changed by changing an applied electrical voltage. In this way, a the electrically conductive polymer directly or indirectly, possibly via other polymers, adjacent biofilm be dissolved.
  • an electrical conductivity at the surface is produced by a material whose structure does not change by applying an electrical voltage, for example by a metal or graphite being present on the surface, a biofilm can be oxidatively attacked by applying a sufficiently high oxidation potential. Moreover, by applying a sufficiently high oxidation potential, it is also possible to generate chemical species which may then be present as a layer and bring about a switching of a polymer which can be switched by redox reactions.
  • the method according to the invention can be initiated in various ways, in particular automatically or at the instigation of a user of the water-conducting household appliance.
  • An automatic implementation of a method according to the invention can be carried out sensor-controlled or time-controlled.
  • the switching provided according to the invention takes place, preferably followed by a further rinsing with a rinsing agent, when a sensor indicates the presence of a biofilm on the inner surface.
  • Such a sensor may be, for example, an odor sensor or an optical sensor.
  • a method according to the invention can be initiated when a sensor signal reaches or exceeds a certain predetermined value for a smell or an optical property, such as scattering or absorption.
  • the sensor may also be a turbidity sensor or a sensor for the detection of a refractive index, a surface tension or an electrical capacitance.
  • Corresponding sensors can be located, for example, in the regions of the water-bearing household appliance that are particularly susceptible to biofilms.
  • the control device of the water-conducting domestic appliance is preferably set up in such a way that it can ascertain the presence or danger of the formation of a biofilm by means of the data obtained by the sensor.
  • the control device in general signals from the sensor are received, which are then compared with stored in the control device corresponding data so that the presence of a biofilm or the risk of formation of a biofilm can be detected.
  • the inventively provided switching operation is then initiated at the switchable polymers.
  • a method according to the invention or the treatment provided therein can advantageously be carried out after a predetermined operating period of the household appliance has been reached or exceeded.
  • the inventive method is therefore initiated time-controlled.
  • the switching operation of the polymer takes place at a time specified in the program. This will depend in particular on how the circuit of the polymer can be made.
  • the method may be triggered in a circuit due to an increase in temperature upon reaching a certain minimum temperature value ("switching temperature") in each wash or rinse performed with a sufficiently high temperature aqueous liquid If the ph value is changed, a switching process can be triggered by a sufficiently high change in the pH value, and a biofilm treatment step can be carried out automatically after a longer period of inactivity or frequent use of washing or rinsing cycles after certain time intervals.
  • the inventive method is initiated manually by a user of the water-conducting household appliance.
  • a method according to the invention can be carried out in order to eliminate a biofilm.
  • a switching process initiated by the user preferably takes place in combination with a corresponding rinsing process, in a washing machine advantageously for example by flushing from the dispensing dish, for example by flushing a rinsing liquid from a special chamber, or by release from a rinsing liquid container.
  • the initiation of the treatment provided by the invention by the user can also be combined with corresponding sensors, for example by informing a user via optical or acoustic display means of the presence or danger of formation of a biofilm.
  • This can, as described in connection with the sensor-controlled introduction, be determined via corresponding sensors and a correspondingly set program control.
  • the method according to the invention is not initiated automatically, but a suggestion is optionally displayed to the user, so that the user can manually initiate the step as desired.
  • the program controller determines the presence or the danger of formation of a biofilm on the basis of the signals of a sensor, this can preferably be displayed to the user. This is done for example by means of a display device by optical and / or acoustic signals.
  • the method according to the invention can be carried out in the case of water-conducting domestic appliances, for example dishwashers, washing machines, washer-dryers or dryers, during an ordinary program sequence, in particular during a rinsing, washing and / or drying process. Then a separate "cleaning process" is unnecessary, however, the process according to the invention can also be carried out as a separate part program in a customary rinsing, washing and / or drying program or as a completely separate treatment program.
  • water-conducting domestic appliances for example dishwashers, washing machines, washer-dryers or dryers
  • the treatment or, in the case of biofilm already present, the biofilm treatment step is carried out before and / or after longer periods of inactivity of the household appliance.
  • biofilms may form in particular, which according to the invention can be avoided and / or removed again.
  • the implementation of the method according to the invention before longer downtime of the household appliance since so already the formation of the biofilm can be avoided and unpleasant odors, corrosion, etc. do not arise.
  • the loosened biofilm is preferably detached with the aid of a rinsing liquid and transported away from the surface, preferably disposed of.
  • a rinsing liquid water as such or an aqueous liquid containing additives may be used.
  • additives may be, for example, detergents or oxidizing agents.
  • the rinsing liquid can be introduced in the water-conducting domestic appliance in different ways, generally depending on the type of domestic appliance and the biofilm-afflicted inner surface.
  • the rinse liquid in a washing machine can travel the same way, i. in particular via the same lines, are introduced as a liquid used for the treatment of objects.
  • the surface is sprayed with the rinsing liquid using a suitable spray device.
  • the water-conducting domestic appliance therefore also comprises a spray device for the rinsing liquid.
  • the household appliance according to the invention preferably comprises a rinsing liquid container for a rinsing liquid already discussed. Controlled by the control device of the household appliance, the rinsing liquid is then generally added in embodiments of the invention for carrying out the method according to the invention.
  • microorganisms and in particular biofilms whose adhesion has been degraded due to the switching of the switchable polymer, mechanically detached and removed.
  • Such surfaces are found, for example, in the area of the dispenser tray and the tub of a washing machine or a washer-dryer. Since these regions are very susceptible to biofilm formation, it is particularly preferred if the reduction in adhesion is supplemented by such a subsequent mechanically acting rinse treatment.
  • a mechanical cleaning step may also mean brushing.
  • an oxidizing agent such as ozone or hypochlorite, for example sodium hypochlorite
  • a rinsing step with a rinsing liquid is carried out in order to remove a more or less dissolved biofilm or microorganisms from the inner surface and preferably from the water-conducting domestic appliance.
  • Household appliance according to the invention and method according to the invention have several advantages. In particular, they enable prevention, reduction and / or elimination of a biofilm on a surface in a water-conducting domestic appliance.
  • the adhesion of a biofilm is generally reduced in the practice of the invention so that it can be easily removed by, for example, rinsing with water or other rinse fluid and not merely killed, as in conventional methods. Moreover, it is possible to control a biofilm without producing harmful degradation products.
  • the method according to the invention can also reach areas in the household appliance which do not come into direct contact with a rinsing solution but have remained moist due to previous processes. Thus, a very thorough "cleaning" can be done.
  • the removal of formed biofilms can be improved and facilitated.
  • the structure of the surface can be switched such that a transition from a hydrophobic to a hydrophilic surface and vice versa takes place.
  • the adhesion of a biofilm can be deteriorated, as a result, in any case, the biofilm after switching lose its adhesive force.
  • the no longer adherent biofilm can then be rinsed off, for example with a rinsing liquid such as water.
  • the polymer can be switched back. This switching can advantageously also be carried out several times (toggling).
  • the invention will be explained in more detail with reference to the exemplary embodiments shown in FIGS. 1 and 2.
  • Fig. 1 is a schematic representation of the presently relevant parts of a first embodiment of the inventive water-conducting household appliance, which is designed here as a washing machine.
  • Fig. 2 shows a vertical section through a water-conducting household appliance, which is designed according to a second embodiment of the invention as a tumble dryer, in which by means of an air-to-air heat exchanger, a heat recovery takes place.
  • the washing machine 1 shown in FIG. 1 has a tub 4 in which a drum 3 as a treatment container for items 7 as objects to be treated about a substantially horizontally disposed axis of rotation 35 of the drum 3 is rotatably mounted and can be operated by a drive motor 14 ,
  • the long arrow indicates a direction of rotation of the drum 3.
  • Wäschemit repertoire repertoire repertoire 36 and scooping devices 37 on the inner surface of the drum shell cause an intensification of the flooding with wash liquor. 6
  • the washing machine 1 has a water supply line (also denoted as Laugenzulaufsystem), which is a water connection fitting for the domestic water network 8, an electrically controllable valve 9 and a supply line 10 to the tub 4, which is guided via a dispenser 1, from the incoming water detergent portions can transport into the tub 4 includes.
  • a water supply line also denoted as Laugenzulaufsystem
  • Laugenzulaufsystem a water connection fitting for the domestic water network 8
  • a supply line 10 to the tub 4 which is guided via a dispenser 1, from the incoming water detergent portions can transport into the tub 4 includes.
  • the supply line 10 is a siphon 21st
  • the dispenser 1 1 and a water storage 33 for recycled water as the inner surface according to the invention each comprise a coating 17 with a switchable polymer, which is switchable in the present case by a change in temperature as a change in the external physical conditions.
  • the first embodiment of the inventive water-conducting household appliance shown in FIG. 1 thus makes it possible to carry out the process according to the invention by virtue of the presence of switchable polymers. As a result of more or less long-lasting switching action, the adhesion of a biofilm on the inner surface is reduced.
  • This process can be mechanically and / or chemically supported by applying a rinsing liquid, the use of a rinsing liquid also allows the removal of a detached biofilm.
  • a rinsing liquid container 25 is connected via a water supply line 16 with an electrically controllable valve 9, which is a connection to the domestic water network 8.
  • the rinsing liquid in the rinsing liquid container 25 can be diluted or replenished with water.
  • the rinsing liquid container 25 is connected to the dispensing dish 1 1 via a first rinsing liquid feed line 20.
  • a second rinsing liquid supply line 26 branches off from the rinsing liquid container 25 to the suds container 4 or to the drum 3, which enables the rinsing liquid to be introduced via a sleeve 24, which is only indicated in the view of FIG. 1, at a feed opening 23 of the drum 3.
  • a supply line 18 branches off from the rinsing liquid container 25, which leads to a spray device 31 and to a water reservoir 33.
  • a controllable closure device 28 is arranged, with which the supply of rinsing liquid can be controlled. Further closure devices may be present in a household appliance according to the invention.
  • the spray device 31 which is arranged at a rear exit of the tub 4, the flushing liquid can be sprayed, for example, into the rear part of the tub 4, which is opposite a feed opening 23 not shown here.
  • the inner tub wall and in particular its rear, the feed opening 23 facing away from the part is a permanently moist surface, which are particularly vulnerable to the formation of a biofilm.
  • a water storage 33 can be subsequently added to a switching operation with a rinsing liquid to the water reservoir 33 of harmful To clean microorganisms and possibly a biofilm and thus to realize a longer storage time of the storage water under hygienic conditions.
  • a display device 29 is located on the washing machine of the embodiment shown here.
  • a sensor 5 is located in the dispenser 1 1.
  • Sensor 5 is, for example, an odor sensor or an optical sensor, which can indicate the occurrence of accumulations of microorganisms or even a biofilm.
  • the sensor 5 is connected to the control device 12 of the washing machine 1 and can cause the automatic execution of a method according to the invention when a predetermined sensor signal is reached or exceeded.
  • the control device 12 which can control the washing machine 1 in accordance with a schedule which is in accordance with a time program and / or the achievement of certain Measured values of parameters such as liquor level, liquor temperature, rotational speed of the drum, determination of the presence of microorganisms or a biofilm, concentration of detergent and / or washing aids, etc. may be bound within the washing machine 1.
  • FIG. 2 shows a vertical section through a water-conducting household appliance, which according to a second embodiment of the invention is configured as a tumble dryer 2, in which heat is recovered by means of an air-air heat exchanger 40 a horizontal axis rotatable drum 3 for receiving not shown here, in particular to be dried, laundry items within which Wäschemit Meeting 36 for movement the garments are attached during a drum rotation.
  • Process air is guided by means of a blower 19 via a heater 13 through the drum 3 in a supply air duct 38. In the supply air duct 38, room air is sucked in by the blower 19 from a supply air inlet 39.
  • the heated air from the heater 13 is from the back, ie, passed from the dryer door 42 opposite side of the drum 3, through the perforated bottom of the drum 3, comes there with the laundry to be dried in contact and flows through the filling opening of the drum. 3 to a fluff grid 43 within the drying door 42 closing the filling opening.
  • the process air flow in the drying door 42 is deflected downwards.
  • the moist, warm process air enters an exhaust duct 33, in which an air-air heat exchanger 40 is located, which cools the warm, laden with moisture process air (here: exhaust air) and leads to condensation of the moisture contained in it to the exhaust outlet 27.
  • the separated moisture is collected in a condensate pan 41, from where it can be removed, for example by pumping.
  • the dryer 2 via the supply air duct 38 supplied room air is used in the air-to-air heat exchanger 40.
  • This supply air is heated by the warm, laden with moisture process air and then before entering the drum 3 by means of heating 13.
  • the condensate pan 41 and the air-air heat exchanger 40 as inner surface according to the invention comprise a coating 17 with a switchable by a temperature change polymer.
  • a rinsing liquid container 25 is provided with which a loosened biofilm can be detached and transported away.
  • the rinsing liquid container 25 is connected via a third rinsing liquid supply line 30 with the air-air heat exchanger 40 and finally the condensate pan 41.
  • a sensor 5 for a biofilm is present, whereby an inventive method can be initiated by the evaluation of a sensor signal.
  • the drum 3 is mounted in the embodiment shown in Fig. 2 at the rear bottom by means of a pivot bearing and front by means of a bearing plate 44, the drum 3 rests with a brim on a sliding strip 45 on the bearing plate 44 and so held at the front end.
  • the control of the condensation dryer via a control device 12 which can be controlled by the user via an operating unit 34.
  • a display device 29 is located on the dryer.
  • Spray device for a rinsing liquid 32 rear outlet of the tub

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)
  • Cleaning By Liquid Or Steam (AREA)
  • Treatment Of Water By Ion Exchange (AREA)
  • Apparatus For Disinfection Or Sterilisation (AREA)

Abstract

L'invention concerne un appareil ménager à circulation d'eau (1, 2) pourvu d'un contenant de traitement (3) destiné à loger des objets (7) à traiter, d'au moins une surface intérieure (10, 11, 33, 40, 41) et en particulier d'une conduite d'amenée d'eau (8, 9), la surface intérieure (10, 11, 33, 40, 41) présentant un revêtement (17) pourvu d'un polymère commutable. L'invention concerne par ailleurs un procédé permettant de faire fonctionner ledit appareil ménager.
EP13805916.7A 2012-12-19 2013-12-17 Appareil ménager à circulation d'eau pourvu d'une surface intérieure à nettoyer, et procédé permettant le fonctionnement dudit appareil ménager Withdrawn EP2935679A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201210223682 DE102012223682A1 (de) 2012-12-19 2012-12-19 Wasserführendes Haushaltsgerät mit inneren Oberfläche sowie Verfahren zu seinem Betrieb
PCT/EP2013/076919 WO2014095876A1 (fr) 2012-12-19 2013-12-17 Appareil ménager à circulation d'eau pourvu d'une surface intérieure à nettoyer, et procédé permettant le fonctionnement dudit appareil ménager

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EP2935679A1 true EP2935679A1 (fr) 2015-10-28

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EP (1) EP2935679A1 (fr)
CN (1) CN105026635B (fr)
DE (1) DE102012223682A1 (fr)
RU (1) RU2622811C2 (fr)
WO (1) WO2014095876A1 (fr)

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JP2017189484A (ja) * 2016-04-15 2017-10-19 日立アプライアンス株式会社 洗濯乾燥機
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Publication number Publication date
DE102012223682A1 (de) 2014-06-26
RU2015127470A (ru) 2017-01-25
RU2622811C2 (ru) 2017-06-20
CN105026635A (zh) 2015-11-04
CN105026635B (zh) 2018-01-16
WO2014095876A1 (fr) 2014-06-26

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