EP2486181B1 - Procede de traitement de la mousse, dispositif de commande programme en ce sens et machine de traitement du linge correspondante - Google Patents

Procede de traitement de la mousse, dispositif de commande programme en ce sens et machine de traitement du linge correspondante Download PDF

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Publication number
EP2486181B1
EP2486181B1 EP10767982.1A EP10767982A EP2486181B1 EP 2486181 B1 EP2486181 B1 EP 2486181B1 EP 10767982 A EP10767982 A EP 10767982A EP 2486181 B1 EP2486181 B1 EP 2486181B1
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Prior art keywords
pressure
drum
foam
treatment machine
solution container
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EP10767982.1A
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German (de)
English (en)
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EP2486181A1 (fr
Inventor
Gundula Czyzewski
Meike Hempel
Ingo Schulze
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BSH Hausgeraete GmbH
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BSH Bosch und Siemens Hausgeraete GmbH
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Priority to PL10767982T priority Critical patent/PL2486181T3/pl
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    • 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 
    • D06F39/06—Arrangements for preventing or destroying scum

Definitions

  • the invention relates to a program-controlled laundry treatment machine with a control device which is programmed so that the laundry treatment machine is able to perform a method for treating foam.
  • the invention also relates to a correspondingly programmed control device for a laundry treatment machine.
  • the invention relates to a corresponding method for treating foam.
  • the cover also includes other means for treating, for example, treating to produce a desired level of foam for a washing process that requires a certain amount of foam.
  • a strong development of foam is disadvantageous in several respects.
  • overly existing foam hampers the washing mechanism - the laundry floats in the foam with almost no movement - resulting in poorer cleaning performance.
  • excess foam leads to increased stress on the heating rods and to strong local temperature differences in the wash liquor. The reason for this is that the temperature sensors react sluggishly because the heat transfer from the foam to the temperature sensor is considerably lower than from a liquid to the temperature sensor.
  • Methods are known in which a recognition of foam occurs at the conclusion of a washing process step during a pump-down phase or a rinse-cycle.
  • the presence of foam is detected via a turbidity sensor.
  • the DE 102 34 472 A1 describes a method in which the detection of foam during a pump-down phase by the determination of a pressure gradient.
  • a pressure signal for detecting the water level in the laundry treatment machine is detected by means of a pressure sensor.
  • the pressure signal initially drops quickly and steadily, indicating the pumping of a foam-free liquor. Thereafter, the pressure signal flattens up to a certain value, the so-called pressure termination point, because the proportion of foam in the liquor increases very rapidly, thereby slowing down the pumping rate. If a sudden increase in the pressure signal is observed before the pressure end point is exceeded, this indicates that the liquid located below the foam has been pumped out and the drain pump starts to pump foam.
  • the first derivative of the pressure is formed after the time, whereby the pressure gradient is obtained.
  • a disadvantage of this method is that the detection of said sudden increase in the pressure signal previously caused a pump at standstill.
  • reasons for the necessity of moving the drum when pumping are, for example, that especially with largely water-impermeable laundry pieces of water pools with foam can form on the lying laundry items, which are suddenly released during spin or lead in programs without intermediate spin to a carryover of alkali and dirt in a subsequent rinse.
  • foam and lint residues can settle in flow-calmed areas of the laundry treatment machine and be concentrated there.
  • DE 10 2007 036 041 A1 in turn, teaches a method for the elimination of foam, wherein in sensor-detected foam during a spin start of the drum, ie in a continuous or discontinuous increase in the drum speed, with continuously or discontinuously switched on the drain pump, a small amount of water is added continuously or discontinuously.
  • the foam is measured as in DE 102 34 472 A1 ,
  • the invention has several advantages. On the one hand, it allows the detection of foam when pumping and on the other hand, it allows a hitherto impossible movement of the laundry drum when detecting the foam. In addition, the invention allows that by a suitable filtering or smoothing of the pressure signal even easier and more accurate detection of foam during pumping, and thus early measures to prevent or prevent unwanted foam can be initiated. In addition, an improved cleaning of the laundry can be achieved by reducing losses of washing performance due to foaming.
  • the pressure profile in the tub is preferably measured continuously during the entire washing phase of the laundry and the pumping step with simultaneous drum movement with a pressure sensor and recorded with a suitable device.
  • a pressure sensor e.g. every 100 ms to every 2 s, preferably every 1.5 s, a measuring point recorded.
  • the pressure oscillates synchronously with the rotation of the laundry drum.
  • the measured pressure curve depends mainly on the type of textile to be washed laundry and located in the tub amount of laundry.
  • the pressure curve thus obtained is smoothed in a second method step (ii) in order to obtain a smoothed pressure curve.
  • a pressure gradient in a defined measuring interval is determined from the pressure curve obtained in step (ii).
  • the pressure curve obtained in step (ii) is preferably continuously during the entire pumping phase investigated a specified pressure drop.
  • the measurement interval thus has a defined length, but it always slides over the pressure curve over the period of time in which the procedure is cited.
  • the steps (i) to (iii) are therefore repeated continuously over a predetermined period of time, preferably during the pumping phase, or all three steps occur simultaneously.
  • step (iii) shows that successive pressure gradients are becoming smaller and smaller, this indicates that there is foam in the laundry treating machine and also that the proportion of foam in the liquor increases very rapidly or finally only foam is present, which can not be removed from the drain pump.
  • measures are taken in a step (iv) accordingly, in particular so depending on the pressure gradient and tuned to this, to eliminate the foam.
  • the laundry treatment machine has a drum, the scooping means for scooping liquid from the tub during rotation has.
  • These scooping devices may be, for example, small apertured protuberances outwardly in the drum shell.
  • This design of the drum is also known as the "upper water system” and used in the washing or rinsing process in a conventional manner to scoop liquid for washing or rinsing the laundry from the gap between the tub and the drum to promote upward and to pour from the top of the laundry in the drum down (also known as raining).
  • the scooping device may be symmetrical - i. all show in one direction - or be designed asymmetrically, with symmetrical design, the scooping effect is the same in both directions of rotation of the drum.
  • the drum for measuring and recording the pressure signal in step (i) is opposite Creation direction rotated, preferably so in symbolsschöpfraum.
  • Creation direction rotated, preferably so in Gegenschöpfraum.
  • the speed of the drum during the process is a speed which corresponds approximately to the normal washing speed, that is about a drum speed in the range of 40 U / min to 60 U / min, preferably 50 U / min.
  • the drum can also be turned faster. It is preferred that the speed of the laundry drum is adapted to the pumping speed, which will be discussed further in the following section as a further preferred embodiment.
  • the smoothing of the pressure signal in step (ii) takes place in that the speed of the laundry drum is adapted to the pumping speed, i.
  • the speed of the laundry drum must be just high enough so that the amount of liquid thrown off by the movement per unit time is less than or equal to the capacity of the drain pump. The reason for this is that with each case of washing in the liquid in the tub a rash of the pressure signal takes place.
  • the smoothing of the pressure signal in step (ii) takes place in that the frequency ranges of the movement of the laundry drum are hidden.
  • This embodiment consists in an "intelligent" frequency correction of the pressure signal curve and is based on the principle that in each case of the laundry in the liquor in the tub, the so-called "wash", a rash of the pressure signal takes place.
  • a frequency range of 2 to 3 Hz In the case of the drum speed in the range of 40 rpm to 60 rpm, a frequency range of 2 to 3 Hz, and in the preferred case of the drum speed of 50 rpm results in a frequency of 2.5 Hz.
  • These frequency ranges are preferably Use appropriate band filters tuned to the frequency ranges of drum motion, blanked out from the measured and recorded pressure waveform, thereby obtaining a smoothed pressure curve. If appropriate, the thus prepared pressure curve can be subjected to low-pass filtering and then used for the evaluation of the pressure curve, ie the determination of the pressure gradient.
  • the pressure gradient is preferably calculated according to the following formula determines, in which p n the pressure value measured in the tub (in Pa) at time t n (in s), p n + 1 of the measured in the tub pressure (in Pa) at time t n + 1 (in s), (p n +1 - p n ) the pressure difference (in Pa) and (t n + 1 - t n ) the measuring interval (in s) over which the pressure gradient is determined, and n is an integer greater than or equal to zero.
  • the defined measurement interval t n + 1 -t n which slides over a certain period of time in which the method is carried out, is preferably in the range between 0.1 seconds and 20 seconds.
  • Yet another preferred embodiment of the invention is characterized in that a measure for the treatment of existing foam is then initiated when the subsequent pressure gradient is smaller in the case of two successive pressure gradients than the previous pressure gradient. It should be noted that the pressure gradient in the pumping phase has a negative sign, since a pressure drop is observed when pumping the liquid from the tub.
  • the measure for treating foam is a measure for removing foam, since often unduly produced foam is to be eliminated.
  • the invention carries the still relevant requirements to avoid unwanted foam in a laundry treatment machine account.
  • a limitation of the applicability of the invention with other measures for the treatment of foam is not associated with this.
  • the measure is another measure that is not aimed at eliminating foam.
  • the measure for the treatment of existing foam for example, in a change in the speed of the laundry drum. This follows from the recognition that contrary to the previous assumptions - the drum movement is basically the cause of the foam formation - certain movements of the drum, a special speed profile or the reciprocating, also called reversing the laundry drum, during the application of a measure for treatment existing foam in the sense of efficient removal of foam not detrimental, but are advantageous.
  • the measure for the treatment of existing foam can consist in a reduction or deactivation of the heating energy for a certain period of time.
  • the measure for the treatment of existing foam by supplying a certain amount of cold and / or warm water exist.
  • This measure is already known per se, but has a special quality in connection with the abovementioned features of the invention.
  • the method is carried out during a pumping down, z. B. to the main wash phase or a rinse cycle of the laundry treatment machine connects.
  • Fig. 1 shows a section A, namely a loosening phase, which takes place after completion of the washing and Spülprogramm intimide and before the start of the spin program.
  • the laundry drum is driven intermittently at washing speed. This usually happens in alternating directions, ie reversing.
  • the speed peaks N 1 to N 17 shown in thin lines represent the interval-like drive of the laundry drum.
  • the level fluctuations (thick line P) of the liquid in the tub are relatively small.
  • the liquid is pumped out of the tub, so that the thick line P drops very steeply almost steadily to almost zero.
  • the speed of the laundry drum increases to a preselected spin speed N S upon detection of a steady level drop in section D. This will make the laundry a larger amount of liquid per unit of time thrown off when the drain pump can handle instantaneous. Consequently, the level of liquid in the tub in section D rises slightly again until the amount of liquid spilled per unit of time becomes smaller than the capacity of the drain pump used for pumping.
  • FIG. 2 shows, however, apart from somewhat greater pressure fluctuations already in section A a strong change in the level curve P during the much longer than in Fig. 1 ongoing section B, which is intended for pumping.
  • Section D is omitted because the lower drop in the pressure curve P signals a significant amount of foam and first one of the above and therefore not shown here foam measures must be initiated so that the foam collapses and can not hinder the rapid drum movement.
  • the level course of P has pressure fluctuations caused by the "laundry case" due to the movement of the laundry drum during pumping.
  • the drum can be moved further at intervals to check if the foam measure has seized.
  • FIG. 3 shows the smoothed pressure curve p (t) in section B of FIG Fig. 2 .
  • the smoothing of the pressure signal measured and recorded in step (i) took place by means of an "intelligent" frequency correction of the pressure signal curve and is based on the principle that in each case of the laundry in the liquid in the tub, the so-called “laundry case", a deflection of the pressure signal he follows.
  • a laundry treatment machine which generally has three drivers and is operated at a speed in the range of 40 U / min to 60 U / min, preferably 50 U / min in the pumping phase, between 120 and 180 pressure signal beats per minute , and in the case of a drum speed of 50 rpm, 150 pressure signal beats per minute are recorded.
  • a frequency range of 2 to 3 Hz In the case of the drum speed in the range of 40 to 60 rpm, a frequency range of 2 to 3 Hz, and in the preferred case of the drum speed of 50 rpm results in a frequency of 2.5 Hz.
  • These frequency ranges are preferably achieved by using appropriate Band filters tuned to the frequency ranges of drum movement, from the measured and recorded Pressure waveform hidden, whereby a smoothed pressure curve is obtained. If appropriate, the thus prepared pressure curve can be subjected to low-pass filtering and then used for the evaluation of the pressure curve, ie the determination of the pressure gradient.
  • the pumping behavior in Fig. 3 is significantly different from the one in Fig. 1 (without drum movement during pumping and without damaging foam).
  • the pumping starts in any case normally with a small offset (period t V ), which lasts for example 2 seconds and marks the safe start of the drain pump.
  • the pressure curve initially falls as in Fig. 1 fast and steady (time period t 1 ). This indicates the pumping of the foam-free liquor.
  • time period t 2 to t 7 the pumping speed slows down constantly, because now the proportion of foam in the liquor increases very quickly or, finally, only foam is present, which can not be deducted from the drain pump.
  • Consecutive level gradients eg from ⁇ p 1 / ⁇ t 1 to ⁇ p 2 / ⁇ t 2 or ⁇ p 6 / ⁇ t 6 to ⁇ p 7 / ⁇ t 7 , therefore become smaller and smaller.
  • the appropriately programmed controller of the washing machine (not shown here) can detect the presence of foam. After the automatic detection of harmful foam can be triggered by the control device at least part of the above measures for treating the foam, which need not be explained in detail here.
  • the method according to the invention allows a recognition of foam already before the spin-on or in programs without intermediate spin.
  • no standstill of the drum during pumping is required.
  • the inventive method has the advantage that no carryover of alkali and dirt and no formation of water pools on the lying, especially water-impermeable textiles takes place.
  • no mechanical engineering changes of the laundry treating machine are required for carrying out the method according to the invention, i. an existing sensor, such as a pressure sensor, can be used.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Control Of Washing Machine And Dryer (AREA)

Claims (13)

  1. Machine de traitement du linge à commande programmée, avec un réservoir à lessive, un tambour rotatif disposé dans le réservoir à lessive pour accueillir le linge à traiter, avec un système d'évacuation de la lessive disposé à la base du réservoir à lessive avec une pompe à lessive et avec un capteur de pression pour déterminer la pression d'un liquide se trouvant dans le réservoir à lessive, et avec un dispositif de commande qui est programmé de sorte que la machine de traitement du linge est en mesure de réaliser le procédé suivant :
    (i) mesure et indication du signal de pression ;
    (ii) lissage du signal de pression afin d'obtenir une courbe de pression lissée ;
    (iii) émission d'un gradient de pression dans un intervalle de mesure avec une longueur définie à partir de la courbe de pression obtenue ; et
    (iv) mise en oeuvre d'une mesure dépendante du gradient de pression et
    concordant avec le gradient de pression afin de traiter la mousse,
    dans laquelle le procédé est prévu pour être réalisé pendant une étape de programme qui sert à purger le réservoir à lessive,
    caractérisée en ce
    que l'étape (i) est réalisée pendant le fonctionnement de la pompe à lessive lors du déplacement simultané du tambour.
  2. Machine de traitement du linge selon la revendication 1, caractérisée en ce que le tambour présente des dispositifs de puisage pour le puisage de liquide hors du réservoir à lessive pendant une rotation, dans laquelle les dispositifs de puisage sont agencés de sorte que le tambour présente une direction de puisage, et dans laquelle le dispositif de commande est programmé de sorte que le tambour effectue une rotation pendant le procédé à l'étape (i) dans la direction opposée à la direction de puisage.
  3. Machine de traitement du linge selon l'une des revendications précédentes 1 à 2, caractérisée en ce que le dispositif de commande est programmé de sorte qu'à l'étape (ii) le lissage du signal de pression est effectué par l'adaptation d'un nombre de tours du tambour à la vitesse de pompe.
  4. Machine de traitement du linge selon l'une des revendications précédentes 1 à 2, caractérisée en ce que le dispositif de commande est programmé de sorte qu'à l'étape (ii) le lissage du signal de pression est effectué par masquage des plages de fréquences du déplacement du tambour.
  5. Machine de traitement du linge selon la revendication 4, caractérisée en ce que le dispositif de commande est programmé de sorte que le masquage des plages de fréquences est effectué par un filtre de bandes qui concorde avec les plages de fréquences.
  6. Machine de traitement du linge selon l'une des revendications précédentes, caractérisée en ce que le dispositif de commande est programmé de sorte que le gradient de pression est déterminé conformément à la formule suivante p n + 1 - p n t n + 1 - t n ,
    Figure imgb0004
    dans laquelle pn est la valeur de pression mesurée dans le réservoir à lessive (en Pa) au moment tn (en s), pn+1 est la valeur de pression mesurée dans le réservoir à lessive (en Pa) au moment tn+1 (en s), (pn+1 - pn) est la différence de pression (en Pa) et (tn+1 - tn) est l'intervalle de mesure (en s), par le biais duquel le gradient de pression est déterminé, et n est un nombre entier supérieur ou égal à zéro.
  7. Machine de traitement du linge selon l'une des revendications précédentes, caractérisée en ce que le dispositif de commande est programmé de sorte que l'intervalle de mesure défini tn+1 - tn se situe dans la plage de 0,1 s à 20 s.
  8. Machine de traitement du linge selon l'une des revendications précédentes, caractérisée en ce que la mesure de traitement de la mousse est mise en oeuvre lorsque, dans le cas de deux gradients de pression successifs, le gradient de pression suivant est inférieur au gradient de pression précédent.
  9. Machine de traitement du linge selon l'une des revendications précédentes, caractérisée en ce que la mesure de traitement de la mousse consiste en une modification du nombre de tours du tambour à linge.
  10. Machine de traitement du linge selon l'une des revendications précédentes, caractérisée en ce que la mesure de traitement de la mousse consiste en une réduction ou une interruption de l'énergie de chauffage pour une durée déterminée.
  11. Machine de traitement du linge selon l'une des revendications précédentes, caractérisée en ce que la mesure de traitement de la mousse consiste en l'amenée d'une certaine quantité d'eau froide et/ou chaude.
  12. Dispositif de commande pour une machine de traitement du linge à commande programmée avec un réservoir à lessive, un tambour rotatif disposé dans le réservoir à lessive pour accueillir le linge à traiter, un système d'évacuation de la lessive disposé à la base du réservoir à lessive avec une pompe à lessive et un capteur de pression pour déterminer la pression d'un liquide se trouvant dans le réservoir à lessive, dans lequel le dispositif de commande est programmé de sorte que la machine de traitement du linge est en mesure de réaliser le procédé suivant :
    (i) mesure et indication du signal de pression ;
    (ii) lissage du signal de pression afin d'obtenir une courbe de pression lissée ;
    (iii) émission d'un gradient de pression dans un intervalle de mesure avec une longueur définie à partir de la courbe de pression obtenue ; et
    (iv) mise en oeuvre d'une mesure dépendante du gradient de pression et
    concordant avec le gradient de pression afin de traiter la mousse,
    dans lequel le procédé est prévu pour être réalisé pendant une étape de programme qui sert à purger le réservoir à lessive,
    caractérisé en ce
    que l'étape (i) est réalisée pendant le fonctionnement de la pompe à lessive lors du déplacement simultané du tambour.
  13. Procédé de traitement de la mousse dans une machine de traitement du linge à commande programmée avec un réservoir à lessive, un tambour rotatif disposé dans le réservoir à lessive pour accueillir le linge à traiter, un système d'évacuation de la lessive disposé à la base du réservoir à lessive avec une pompe à lessive et un capteur de pression pour déterminer la pression d'un liquide se trouvant dans le réservoir à lessive, lequel procédé comprend les étapes suivantes :
    (i) mesure et indication du signal de pression ;
    (ii) lissage du signal de pression afin d'obtenir une courbe de pression lissée ;
    (iii) émission d'un gradient de pression dans un intervalle de mesure avec une longueur définie à partir de la courbe de pression obtenue ; et
    (iv) mise en oeuvre d'une mesure dépendante du gradient de pression et
    concordant avec le gradient de pression afin de traiter la mousse,
    dans lequel le procédé est prévu pour être réalisé pendant une étape de programme qui sert à purger le réservoir à lessive,
    caractérisé en ce
    que l'étape (i) est réalisée pendant le fonctionnement de la pompe à lessive lors du déplacement simultané du tambour.
EP10767982.1A 2009-10-07 2010-10-06 Procede de traitement de la mousse, dispositif de commande programme en ce sens et machine de traitement du linge correspondante Active EP2486181B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL10767982T PL2486181T3 (pl) 2009-10-07 2010-10-06 Sposób obróbki piany, odpowiednio zaprogramowane urządzenie sterujące oraz odpowiednia maszyna do obróbki prania

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009045433A DE102009045433B4 (de) 2009-10-07 2009-10-07 Verfahren zum Behandeln von Schaum, entsprechend programmierte Steuereinrichtung sowie entsprechende Wäschebehandlungsmaschine
PCT/EP2010/064892 WO2011042456A1 (fr) 2009-10-07 2010-10-06 Procédé de traitement de la mousse, dispositif de commande programmé en ce sens et machine de traitement du linge correspondante

Publications (2)

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EP2486181A1 EP2486181A1 (fr) 2012-08-15
EP2486181B1 true EP2486181B1 (fr) 2013-08-28

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EP (1) EP2486181B1 (fr)
CN (1) CN102575411B (fr)
DE (1) DE102009045433B4 (fr)
EA (1) EA021023B1 (fr)
PL (1) PL2486181T3 (fr)
WO (1) WO2011042456A1 (fr)

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US9127392B2 (en) * 2010-10-15 2015-09-08 Whirlpool Corporation Method and apparatus to detect an over-suds condition
DE102020213390A1 (de) 2020-10-23 2022-04-28 BSH Hausgeräte GmbH Verfahren zum bestimmen von schaum beim behandeln von wäschestücken sowie wäschepflegemaschine zu dessen durchführung

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4342274A1 (de) * 1993-12-10 1995-06-14 Bosch Siemens Hausgeraete Automatisch gesteuerte Waschmaschine
CN1085266C (zh) * 1995-05-31 2002-05-22 Bsh博施及西门子家用器具有限公司 自动控制的洗衣机
DE19606769B4 (de) * 1996-02-23 2006-05-11 AEG Hausgeräte GmbH Programmgesteuerte Waschmaschine mit einer Einrichtung zur Reduzierung der Schaumbildung
DE19846248A1 (de) * 1998-10-07 2000-04-13 Bsh Bosch Siemens Hausgeraete Verfahren zur Überwachung und Steuerung des Spülprozesses in einer Wäschebehandlungsmaschine sowie nach diesem Verfahren arbeitende Wäschebehandlungsmaschine
DE10136519B4 (de) * 2001-07-26 2004-09-02 BSH Bosch und Siemens Hausgeräte GmbH Verfahren zum Betreiben einer programmierbaren Waschmaschine und dafür geeignete Waschmaschine
DE10234472A1 (de) * 2002-07-29 2004-02-12 BSH Bosch und Siemens Hausgeräte GmbH Verfahren zum Beseitigen von Schaum im Laugenbehälter einer Trommelwaschmaschine
DE102006027197A1 (de) * 2006-06-12 2007-12-13 BSH Bosch und Siemens Hausgeräte GmbH Verfahren zum Beseitigen von Schaum in einer Trommelwaschmaschine und hierzu geeignete Trommelwaschmaschine
DE102007036041A1 (de) * 2007-08-01 2009-02-05 BSH Bosch und Siemens Hausgeräte GmbH Verfahren zum Beseitigen von Schaum in einer Trommelwaschmaschine und hierzu geeignete Trommelwaschmaschine

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CN102575411A (zh) 2012-07-11
EA201270442A1 (ru) 2012-11-30
DE102009045433B4 (de) 2011-09-15
EP2486181A1 (fr) 2012-08-15
DE102009045433A1 (de) 2011-04-28
PL2486181T3 (pl) 2014-01-31
EA021023B1 (ru) 2015-03-31
WO2011042456A1 (fr) 2011-04-14
CN102575411B (zh) 2014-11-05

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