EP2486181A1 - Verfahren zum behandeln von schaum, entsprechend programmierte steuereinrichtung sowie entsprechende wäschebehandlungsmaschine - Google Patents
Verfahren zum behandeln von schaum, entsprechend programmierte steuereinrichtung sowie entsprechende wäschebehandlungsmaschineInfo
- Publication number
- EP2486181A1 EP2486181A1 EP10767982A EP10767982A EP2486181A1 EP 2486181 A1 EP2486181 A1 EP 2486181A1 EP 10767982 A EP10767982 A EP 10767982A EP 10767982 A EP10767982 A EP 10767982A EP 2486181 A1 EP2486181 A1 EP 2486181A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pressure
- laundry
- foam
- drum
- tub
- 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.)
- Granted
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
- D06F39/06—Arrangements for preventing or destroying scum
Definitions
- the present invention relates to a program-controlled laundry treating machine having a controller programmed to allow the laundry-treating machine to carry out a method of treating foam.
- the invention also relates to a suitably 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 swims almost without movement in the foam - which results in a worsened 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.
- a method in which the foam is measured after pumping out the rinsing liquid is known, for example, from the document DE 198 46 248 A1.
- the presence of foam is detected via a turbidity sensor.
- DE 102 34 472 A1 describes a method in which the detection of foam takes place during a pumping-down phase by determining 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. From the detected pressure signal, the first derivative of the pressure is formed after the time, whereby the pressure gradient is obtained. By this, but also by the course of the determined pressure signal itself, the presence or absence of foam in the laundry treatment machine can be assessed.
- 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 of removing foam in which foam is detected by a sensor during a spin-up of the drum, i. in the case of a continuous or discontinuous increase in the drum speed, in the case of a continuously or discontinuously switched-in drain pump, a small amount of water is added continuously or discontinuously.
- the foam is measured as in DE 102 34 472 A1.
- DE 10 2006 027 197 A1 likewise discloses a method for removing foam. The measurement of the presence of foam is not described.
- a program-controlled laundry treatment machine with a arranged in the tub rotatable drum for receiving laundry to be treated, arranged at the bottom of the tub lye drain system with a drain pump and with a pressure sensor for determining the pressure of a liquid in the tub, and with a controller programmed so that the laundry treating machine is capable of performing the following procedure:
- step (i) is performed during operation of the tub pump while moving the drum.
- 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.
- the pressure curve in the tub is filtered by oscillations due to the rotation of the laundry drum, and as a result a pressure curve with reduced variation is obtained.
- 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.
- the laundry treatment machine according to the invention 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 pouring from above onto the laundry in the drum (also referred to as rain-down)
- the scooping device can be symmetrical - ie all pointing in one direction - or asymmetrical, with a symmetrical configuration equaling the scooping effect in both directions of rotation of the drum.
- a preferred direction of rotation results, in which more liquid is drawn from the tub than in the other direction Fluid improves.
- 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 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 become preferably by using appropriate band filters that are tuned to the frequency ranges of the drum motion, hidden from the measured and recorded pressure waveform, whereby a smoothed pressure curve is obtained.
- the thus prepared pressure curve may 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
- n the pressure value measured in the tub (in Pa) at time t n (in s)
- Pn + i the pressure value measured in the tub (in Pa) at time t n + 1 (in s)
- Pn + i - Pn the pressure difference (in Pa)
- t n + 1 - t n the measuring interval (in s), over which the pressure gradient is determined
- n is an integer greater than or equal to 0.
- the defined measuring interval t n + i -t n which slides over a certain period in which the method is carried out, is preferably in the range between 0, 1 second 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.
- 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. However, there may also be embodiments in which foaming is desired. In this case, 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.
- Figure 1 is a pressure diagram showing the measured pressure curve p (t) during the drum rotation at the speed n (t) and when pumping (without drum rotation) without disturbing foam in the tub.
- Fig. 2 is a pressure diagram showing the measured pressure curve p (t) during the drum rotation at the speed n (t) and when pumping (with drum rotation) with interfering foam in the tub;
- FIG. 3 is a pressure diagram showing the smoothed pressure curve p (t) in section B of FIG.
- the diagram of Fig. 1 shows a section A, namely a loosening phase, which takes place after completion of the washing and rinsing program steps 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 Ni to N 17 drawn 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 pre-selected 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.
- step (i) The smoothing of the pressure signal measured and recorded in step (i) was carried out 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 liquor in the tub, the so-called “laundry case", a rash of the pressure signal takes place.
- a laundry treating machine which usually has three drivers and a speed in the range of 40 U / min to 60 rpm, preferably 50 rpm 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
- the drum speed in the range of 40 up to 60 rpm results in a frequency range of 2 to 3 Hz, and in the preferred case of the drum speed of 50 rev / min a frequency of 2.5 Hz.
- This Frequency ranges are preferably measured and recorded by using appropriate band filters tuned to the frequency ranges of drum motion 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 Abpump in Fig. 3 differs significantly from that in Fig. 1 (without drum movement during pumping and without harmful 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. Thereafter, the pressure curve falls first as in Fig. 1 quickly and steadily from (period t- ⁇ ). This indicates the pumping of the foam-free liquor. But later (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 ⁇ - ⁇ / ⁇ - ⁇ to ⁇ 2 / ⁇ 2 or ⁇ 6 / ⁇ 6 to ⁇ 7 / ⁇ 7 , are therefore becoming 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, the control device can trigger 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.
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Control Of Washing Machine And Dryer (AREA)
Abstract
Description
Claims
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 (de) | 2009-10-07 | 2010-10-06 | Verfahren zum behandeln von schaum, entsprechend programmierte steuereinrichtung sowie entsprechende wäschebehandlungsmaschine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2486181A1 true EP2486181A1 (de) | 2012-08-15 |
| EP2486181B1 EP2486181B1 (de) | 2013-08-28 |
Family
ID=43355570
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP10767982.1A Active EP2486181B1 (de) | 2009-10-07 | 2010-10-06 | Verfahren zum behandeln von schaum, entsprechend programmierte steuereinrichtung sowie entsprechende wäschebehandlungsmaschine |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP2486181B1 (de) |
| CN (1) | CN102575411B (de) |
| DE (1) | DE102009045433B4 (de) |
| EA (1) | EA021023B1 (de) |
| PL (1) | PL2486181T3 (de) |
| WO (1) | WO2011042456A1 (de) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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)
| 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 |
-
2009
- 2009-10-07 DE DE102009045433A patent/DE102009045433B4/de not_active Expired - Fee Related
-
2010
- 2010-10-06 EP EP10767982.1A patent/EP2486181B1/de active Active
- 2010-10-06 EA EA201270442A patent/EA021023B1/ru not_active IP Right Cessation
- 2010-10-06 WO PCT/EP2010/064892 patent/WO2011042456A1/de not_active Ceased
- 2010-10-06 PL PL10767982T patent/PL2486181T3/pl unknown
- 2010-10-06 CN CN201080044899.7A patent/CN102575411B/zh active Active
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2011042456A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102575411A (zh) | 2012-07-11 |
| EP2486181B1 (de) | 2013-08-28 |
| DE102009045433A1 (de) | 2011-04-28 |
| EA201270442A1 (ru) | 2012-11-30 |
| DE102009045433B4 (de) | 2011-09-15 |
| PL2486181T3 (pl) | 2014-01-31 |
| EA021023B1 (ru) | 2015-03-31 |
| WO2011042456A1 (de) | 2011-04-14 |
| CN102575411B (zh) | 2014-11-05 |
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