EP0369270A1 - Method and device to optimise a spinning speed/time curve of washing machines - Google Patents

Method and device to optimise a spinning speed/time curve of washing machines Download PDF

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Publication number
EP0369270A1
EP0369270A1 EP89120449A EP89120449A EP0369270A1 EP 0369270 A1 EP0369270 A1 EP 0369270A1 EP 89120449 A EP89120449 A EP 89120449A EP 89120449 A EP89120449 A EP 89120449A EP 0369270 A1 EP0369270 A1 EP 0369270A1
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EP
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Prior art keywords
spin
stage
final
speed
drum
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EP89120449A
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German (de)
French (fr)
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EP0369270B1 (en
Inventor
Waldemar Schmidbauer
Rainer Dr.Dipl.-Phys. Stamminger
Jörg Dipl.-Phys. Andreä
Nikos Dipl.-Ing. Kulantsis
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Licentia Patent Verwaltungs GmbH
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Licentia Patent Verwaltungs GmbH
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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
    • D06F35/00—Washing machines, apparatus, or methods not otherwise provided for
    • D06F35/005—Methods for washing, rinsing or spin-drying
    • D06F35/007—Methods for washing, rinsing or spin-drying for spin-drying only

Definitions

  • the invention relates to a method and a device for optimizing the spin speed-time profile, in particular in household washing machines according to the preamble of claim 1. It relates in particular to a method for an optimal start-up of the laundry drum during spin drying, the last step of a washing machine program.
  • a "control circuit for different spin speeds of a washing machine” is known from DE-OS 36 15 712.
  • the different spin speeds are increased to 1000 revolutions per minute in several, for example four, stages until the maximum speed is reached.
  • the runtime per speed value is constant in each case one minute so that the maximum spin speed is reached after about three minutes.
  • the number of revolutions of equal to or greater than 1400 revolutions per minute and thus optimal dewatering of the laundry can only be achieved with the aid of separate spin dryers.
  • spin dryers are only a supplement to the known household washing machines. Although they can be set up as free-standing models, they require space and their own drainage system. (Except for the cumbersome transfer of laundry from the washing machine drum into the spin dryer).
  • the object of the invention is to effectively avoid the deficiencies and disadvantages inherent in the prior art by means of a suitable centrifugal process.
  • the number of revolutions of the laundry drum during the final spin is increased in four stages at the end of the washing program: In about 1.2 minutes in small steps, the so-called "soft start” to 850 revolutions per minute. These 850 revolutions per minute of the first stage are kept constant for 5 minutes, then in the second stage: acceleration to 1000 revolutions per minute and keeping this speed constant for 1.7 minutes, then in the third stage: acceleration to 1150 revolutions per minute and Keeping this speed constant for 1.2 minutes, then in the fourth stage: acceleration to 1350 revolutions per minute and keeping this speed constant for 0.5 Minutes, then brake the laundry drum to a standstill.
  • the laundry of a drum filling is optimally spun dry using this process.
  • the moisture content or the residual moisture which is gradually withdrawn by the increase in the drum speed is illustrated in the diagram according to FIG. 2 according to the solid lines.

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

Abstract

During the last part of the programme, the so-called final spin, as much moisture must be removed from the textile pieces as possible. In known washing machines this takes place at washing drum speeds of 1000 to 1200 revolutions per minute. A subsequent spin in separate spin dryers may be necessary. Using the method of the invention, the textile pieces are stripped of sufficient moisture while still in the washing machine as to make a subsequent spin unnecessary. In the method of the invention, the drum speeds are kept constant at the final spin stage at four predetermined levels for four predetermined periods while being gradually speeded up to a maximum speed of 1400 revolutions per minute, and this final speed is maintained for a short period until the braking has started to bring the drum to a stop. The method of the invention is suitable for performing the final spin programme of domestic washing machines. <IMAGE>

Description

Die Erfindung betrifft ein Verfahren und eine Vorrichtung zur Optimierung des Schleuderdrehzahl-Zeit-Profils, insbesondere bei Haushaltwaschmaschinen nach dem Oberbegriff des Anspruchs 1. Sie betrifft speziell ein Verfahren für ein optimales Hochlaufen der Wäschetrommel während des Trockenschleuderns, dem letzten Schritt eines Waschmaschinenprogramms.The invention relates to a method and a device for optimizing the spin speed-time profile, in particular in household washing machines according to the preamble of claim 1. It relates in particular to a method for an optimal start-up of the laundry drum during spin drying, the last step of a washing machine program.

Bei bekannten Haushaltwaschmaschinen wird eine wäscheschonende Entwässerung durch Schleudern in mehreren Stufen mit steigender Wäschetrommel-Drehzahl erreicht. Die Schleuderenddrehzahlen liegen hier bei 850 bzw. bei maximal 1200 Umdrehungen pro Minute. (AEG-Prospekt 1988 "Waschautomaten, Trockner, Schleudern").In known household washing machines, laundry-friendly dewatering is achieved by spinning in several stages with increasing drum speed. The final spin speeds here are 850 or a maximum of 1200 revolutions per minute. (AEG brochure 1988 "Washing machines, dryers, spinners").

Des weiteren ist aus der DE-OS 36 15 712 eine "Steuerschaltung für unterschiedliche Schleuderdrehzahlen einer Waschmaschine" bekannt. Auch hierbei werden in mehreren, beispielsweise vier Stufen die unterschiedlichen Schleuderdrehzahlen bis zum Erreichen der maximalen Drehzahl auf 1000 Umdrehungen pro Minute erhöht. Die Laufzeit pro Drehzahlwert beträgt jeweils gleichbleibend eine Minute so daß die maximale Schleuderdrehzahl nach ca. drei Minuten erreicht ist.Furthermore, a "control circuit for different spin speeds of a washing machine" is known from DE-OS 36 15 712. Here too, the different spin speeds are increased to 1000 revolutions per minute in several, for example four, stages until the maximum speed is reached. The runtime per speed value is constant in each case one minute so that the maximum spin speed is reached after about three minutes.

Im Hinblick auf den Stand der Technik können lediglich mit Hilfe separater Wäscheschleudern Umdrehungszahlen von gleich oder größer 1400 Umdrehungen pro Minute und damit eine optimale Entwässerung der Wäsche erzielt werden. Derartige Wäscheschleudern stellen jedoch lediglich eine Ergänzung zu den bekannten Haushaltwaschmaschinen dar. Sie sind als Standmodelle zwar frei aufstellbar, benötigen aber Platz und ein eigenes Abflußsystem. (Abgesehen von der umständlichen Wäscheumladung aus der Waschmaschinentrommel in die Wäscheschleudertrommel).With regard to the state of the art, the number of revolutions of equal to or greater than 1400 revolutions per minute and thus optimal dewatering of the laundry can only be achieved with the aid of separate spin dryers. However, such spin dryers are only a supplement to the known household washing machines. Although they can be set up as free-standing models, they require space and their own drainage system. (Except for the cumbersome transfer of laundry from the washing machine drum into the spin dryer).

Der Erfindung liegt die Aufgabe zugrunde, die dem Stand der Technik anhaftenden Mängel und Nachteile durch ein geeignetes Schleuderverfahren wirksam zu vermeiden.The object of the invention is to effectively avoid the deficiencies and disadvantages inherent in the prior art by means of a suitable centrifugal process.

Diese Aufgabe, gemäß der Erfindung, wird durch die kennzeichnenden Merkmale des Anspruchs 1 gelöst. Eine weitere vorteilhafte Ausgestaltung des erfindungsgemäßen Verfahrens ist den Unteransprüchen zu entnehmen.This object, according to the invention, is achieved by the characterizing features of claim 1. A further advantageous embodiment of the method according to the invention can be found in the subclaims.

Die durch das erfindungsgemäße Verfahren erzielbaren Vorteile bestehen insbesondere darin, daß eine weit über der bei bekannten Waschmaschinen liegende Schleuderenddrehzahl sicher erreicht und die Wäsche demzufolge optimal entwässert bzw. deren Restfeuchtigkeit auf ein Mindestmaß reduziert wird. Ein Nachschleudern in separaten Wäscheschleudern entfällt. Das Drehzahl-­Hochlaufprofil der Wäschetrommel wurde so gewählt, daß die Belastung der Antriebsmotor- und Wäschetrommel-Lagerung trotz erhöhter Schleuderenddrehzahl minimal bleibt. Dadurch können in vorteilhafter Weise fertigungsmäßig die Lager herkömmlicher Waschmaschinen eingesetzt werden, ohne daß deren übliche Lebensdauer gemindert würde, d.h. teuere Spezialhochleistungslager sind nicht erforderlich.The advantages which can be achieved by the method according to the invention consist in particular in that a final spin speed which is far above that in known washing machines is reliably achieved and the laundry is consequently optimally dewatered or its residual moisture is reduced to a minimum. A re-spin in separate spin dryers is not necessary. The speed ramp-up profile of the laundry drum was chosen so that the load on the drive motor and laundry drum bearings remains minimal despite the increased spin speed. As a result, the bearings of conventional washing machines can advantageously be used for production purposes without their usual life would be reduced, ie expensive special high-performance bearings are not required.

Ein Ausführungsbeispiel der Erfindung ist anhand von Diagrammen dargestellt und wird im folgenden näher erläutert.An embodiment of the invention is illustrated by means of diagrams and is explained in more detail below.

Es zeigen:

  • Fig. 1 das Drehzahlprofil eines End- oder Fertig-­Schleudergangs (Trockenschleudern) mit der Wäschetrommelumdrehungszahl in Abhängigkeit von der Zeit,
  • Fig. 2 die Restfeuchtigkeit der Wäsche in Abhängigkeit von der Schleuderzeit mit der Wäschetrommelumdrehungszahl als Parameter,
  • Fig. 3 die effektive Lagerbelastung in Abhängigkeit von dem Schleuderzeit, mit der Wäschetrommelumdrehungszahl als Parameter.
Show it:
  • 1 shows the speed profile of a final or finished spin cycle (dry spin) with the laundry drum speed as a function of time,
  • 2 shows the residual moisture of the laundry as a function of the spin cycle with the laundry drum speed as a parameter,
  • Fig. 3 shows the effective bearing load depending on the spin time, with the laundry drum speed as a parameter.

Gemäß Fig. 1 wird die Umdrehungszahl der Wäschetrommel beim Fertigschleudern, zum Waschprogrammende in vier Stufen hochgefahren:
Innerhalb ca. 1,2 Minuten in kleinen Stufen, dem sogenannten "Sanftanlauf" auf 850 Umdrehungen pro Minute. Diese 850 Umdrehungen pro Minute der ersten Stufe werden während 5 Minuten konstant gehalten, anschließend in der zweiten Stufe: Beschleunigung auf 1000 Umdrehungen pro Minute und Konstanthalten dieser Drehzahl während 1,7 Minuten, anschließend in der dritten Stufe: Beschleunigung auf 1150 Umdrehungen pro Minute und Konstanthalten dieser Drehzahl während 1,2 Minuten, anschließend in der vierten Stufe: Beschleunigung auf 1350 Umdrehungen pro Minute und Konstanthalten dieser Drehzahl während 0,5 Minuten, danach Abbremsen der Wäschetrommel bis zum Stillstand.According to FIG. 1, the number of revolutions of the laundry drum during the final spin is increased in four stages at the end of the washing program:
In about 1.2 minutes in small steps, the so-called "soft start" to 850 revolutions per minute. These 850 revolutions per minute of the first stage are kept constant for 5 minutes, then in the second stage: acceleration to 1000 revolutions per minute and keeping this speed constant for 1.7 minutes, then in the third stage: acceleration to 1150 revolutions per minute and Keeping this speed constant for 1.2 minutes, then in the fourth stage: acceleration to 1350 revolutions per minute and keeping this speed constant for 0.5 Minutes, then brake the laundry drum to a standstill.

Die Wäsche einer Trommelfüllung wird durch dieses Verfahren optimal trockengeschleudert. Der durch die Trommeldrehzahl­erhöhung schrittweise entzogene Feuchtigkeitsgehalt bzw. die Restfeuchte ist im Diagramm nach Fig. 2 gemäß den stark ausgezogenen Linien veranschaulicht.The laundry of a drum filling is optimally spun dry using this process. The moisture content or the residual moisture which is gradually withdrawn by the increase in the drum speed is illustrated in the diagram according to FIG. 2 according to the solid lines.

Die Zunahme der effektiven Lagerbelastung des Gerätes während der stufenweisen Erhöhung der Wäschetrommel-­Umdrehungszahlen verdeutlichen die stark ausgezogenen Linien im Diagramm nach Fig. 3.The increase in the effective bearing load on the device during the gradual increase in the number of revolutions of the laundry drum is illustrated by the solid lines in the diagram according to FIG. 3.

Praktische Untersuchungen haben ergeben, daß die vorerwähnt gestuften Wäschetrommel-Umdrehungszahlen nur mit einer Genauigkeit von +- 10% ihrer Nennwerte und die jeweils zugehörigen Schleuderzeiten mit einer Genauigkeit von +- 20 % ihrer Kennwerte eingehalten werden müssen. Innerhalb dieser Toleranzbreiten ergeben sich insgesamt gesehen in etwa dieselben Ergebnisse in punkto erzielter minimaler Restfeuchtigkeit und minimaler Lagerbelastung.Practical investigations have shown that the above-mentioned graduated washing drum revolutions only have to be observed with an accuracy of + - 10% of their nominal values and the respectively associated spin times with an accuracy of + - 20% of their characteristic values. Overall, within these tolerance ranges, approximately the same results are obtained in terms of minimum residual moisture and minimal bearing load.

Abschließend sei noch bemerkt, daß eine Aufteilung in 5 oder mehr Trommeldrehzahl-Stufen denkbar und möglich wäre, nennenswerte Vorteile ergeben sich jedoch nicht.Finally, it should be noted that a division into 5 or more drum speed stages would be conceivable and possible, but there are no significant advantages.

Claims (4)

1.Verfahren zur Optimierung des Schleuderdrehzahl-Zeit-­Profils, insbesondere bei Haushaltwaschmaschinen mit einer motorangetriebenen Wäschetrommel, die in vier Stufen während des letzten Programmschritts auf eine maximale Schleuderenddrehzahl, unter Einhaltung vorgegebener Zeiten beschleunigbar ist, dadurch gekennzeichnet, daß die Wäschetrommel innerhalb der 1. Stufe bei einer Umdrehungszahl von 850 Umdrehungen pro Minute während einer Zeit von fünf Minuten,
anschließend in der zweiten Stufe auf 1000 Umdrehungen pro Minute beschleunigt und 1,7 Minuten lang,
anschließend in der dritten Stufe auf 1150 Umdrehungen pro Minute beschleunigt und 1,2 Minuten lang,
schließlich in der vierten und letzten Stufe auf 1350 Umdrehungen pro Minute endbeschleunigt und 0,5 Minuten lang konstant gehalten wird.1.Procedure for optimizing the spin speed-time profile, especially in household washing machines with a motor-driven laundry drum, which can be accelerated in four stages during the last program step to a maximum final spin speed while observing predetermined times, characterized in that the laundry drum within the first Stage at a speed of 850 revolutions per minute for a period of five minutes,
then accelerated to 1000 rpm in the second stage and for 1.7 minutes,
then accelerated to 1150 rpm in the third stage and for 1.2 minutes,
finally, in the fourth and final stage, the final acceleration to 1350 revolutions per minute is held and kept constant for 0.5 minutes. 2.Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die vierfach gestuften Wäschetrommel-Umdrehungszahlen mit einer Genauigkeit von gleich oder kleiner +- 10 % ihrer Kennwerte eingehalten werden.2.The method according to claim 1, characterized in that the four-stage washing drum revolutions are observed with an accuracy of equal to or less than + - 10% of their characteristic values. 3.Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die vierfach gestuften Schleuderzeiten mit einer Genauigkeit von von gleich oder kleiner +- 20 % ihrer Kennwerte eingehalten werden.3.Verfahren according to claim 1, characterized in that the four-stage spin times are maintained with an accuracy of equal to or less than + - 20% of their characteristics. 4.Vorrichtung zur Durchführung des Verfahrens nach Anspruch 1, dadurch gekennzeichnet, daß in einem Elektronikmodul mit Mikroprozessor oder in einem Programmschaltwerk der Haushaltwaschmaschine die vorgegebenen, gestuften Drehzahlen samt ihren jeweiligen Schleuderzeiten für den letzten Waschprogrammschritt abgelegt oder vorgesehen sind.4.Device for performing the method according to claim 1, characterized in that in an electronic module with a microprocessor or in a program switch of the household washing machine, the predetermined, staggered speeds, including their respective spin times for the last washing program step are stored or provided.
EP89120449A 1988-11-18 1989-11-04 Method and device to optimise a spinning speed/time curve of washing machines Expired - Lifetime EP0369270B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3838997A DE3838997A1 (en) 1988-11-18 1988-11-18 METHOD AND DEVICE FOR OPTIMIZING THE SPIN SPEED-TIME PROFILE, IN PARTICULAR FOR HOUSEHOLD WASHING MACHINES
DE3838997 1988-11-18

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EP0369270A1 true EP0369270A1 (en) 1990-05-23
EP0369270B1 EP0369270B1 (en) 1993-04-14

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EP89120449A Expired - Lifetime EP0369270B1 (en) 1988-11-18 1989-11-04 Method and device to optimise a spinning speed/time curve of washing machines

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2249847A (en) * 1990-08-28 1992-05-20 Toshiba Kk Clothes dehydrator
EP0542137A1 (en) * 1991-11-11 1993-05-19 Zanussi Elettrodomestici S.p.A. Method for the treatment of laundry in a laundry washer/drier combination
CN104963165A (en) * 2015-05-29 2015-10-07 无锡小天鹅股份有限公司 Washing machine dehydration method
CN114645416A (en) * 2020-12-18 2022-06-21 青岛海尔洗衣机有限公司 Dewatering control method of washing machine

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4206135A1 (en) * 1992-02-28 1993-09-02 Licentia Gmbh Controlling spinning process of drum washing machine - using revolution speed control device for electric motor which is supplied with washing parameters., e.g. vol. of washing and/or type of washing, etc.

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3615712A1 (en) * 1986-05-09 1987-11-12 Ako Werke Gmbh & Co CONTROL CIRCUIT FOR DIFFERENT SPIN SPEEDS OF A WASHING MACHINE
US4782544A (en) * 1987-04-16 1988-11-08 Whirlpool Corporation Water extraction method and control for automatic washer

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3615712A1 (en) * 1986-05-09 1987-11-12 Ako Werke Gmbh & Co CONTROL CIRCUIT FOR DIFFERENT SPIN SPEEDS OF A WASHING MACHINE
US4782544A (en) * 1987-04-16 1988-11-08 Whirlpool Corporation Water extraction method and control for automatic washer

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2249847A (en) * 1990-08-28 1992-05-20 Toshiba Kk Clothes dehydrator
US5181398A (en) * 1990-08-28 1993-01-26 Kabushiki Kaisha Toshiba Dehydrator
GB2249847B (en) * 1990-08-28 1994-12-07 Toshiba Kk Dehydrator
EP0542137A1 (en) * 1991-11-11 1993-05-19 Zanussi Elettrodomestici S.p.A. Method for the treatment of laundry in a laundry washer/drier combination
CN104963165A (en) * 2015-05-29 2015-10-07 无锡小天鹅股份有限公司 Washing machine dehydration method
CN104963165B (en) * 2015-05-29 2018-03-16 无锡小天鹅股份有限公司 The dewatering of washing machine
CN114645416A (en) * 2020-12-18 2022-06-21 青岛海尔洗衣机有限公司 Dewatering control method of washing machine

Also Published As

Publication number Publication date
DE58904070D1 (en) 1993-05-19
EP0369270B1 (en) 1993-04-14
DE3838997A1 (en) 1990-05-23

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