EP0724036A1 - Waschmaschine mit Vorrichtung zur Schaumverminderung - Google Patents

Waschmaschine mit Vorrichtung zur Schaumverminderung Download PDF

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Publication number
EP0724036A1
EP0724036A1 EP96100503A EP96100503A EP0724036A1 EP 0724036 A1 EP0724036 A1 EP 0724036A1 EP 96100503 A EP96100503 A EP 96100503A EP 96100503 A EP96100503 A EP 96100503A EP 0724036 A1 EP0724036 A1 EP 0724036A1
Authority
EP
European Patent Office
Prior art keywords
washing machine
clothes washing
machine according
mean value
control means
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Withdrawn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
EP96100503A
Other languages
English (en)
French (fr)
Inventor
Silvano Cimetta
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.)
Electrolux Zanussi SpA
Original Assignee
Electrolux Zanussi Elettrodomestici SpA
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 Electrolux Zanussi Elettrodomestici SpA filed Critical Electrolux Zanussi Elettrodomestici SpA
Publication of EP0724036A1 publication Critical patent/EP0724036A1/de
Withdrawn legal-status Critical Current

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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 refers to a clothes washing machine provided with improved means for automatically controlling excessive foaming reactions and taking corrective actions accordingly.
  • Clothes washing machines are generally known in the art, whose operation is controlled by programme sequence control means, said programme sequence usually including one or more clothes rinsing phases at the end of the actual washing phase.
  • a further problem brought about by an excessive amount of foam forming in the tub during laundering lies in the fact that, in the subsequent rinsing and spin-extraction phases, such a foam cannot be entirely removed by the action of normal rinsing phases, which will obviously have been designed to cope with just low-to-medium sized amounts of foam, also in view of limiting rinsing water usage.
  • water will be used generally in the following description to mean both washing liquor and rinsing water. However, such a simplification should not affect the understandability of the same description owing to the context in which such a term is used, as anyone skilled in the art will readily appreciate.
  • the described machine comprises a washing tub 1, a drum 2 rotatably arranged within said washing tub and adapted to hold the washload, a driving motor (not shown) connected to said rotating drum and adapted to rotatably driving the latter ad variable, pre-selectable rotating speeds.
  • a water discharge conduit 4 is arranged underneath said washing tub along with water pressure sensing means 5 mounted in an air chamber 6, whose open portion is connected with the lower portion of said water discharge conduit, and adapted to detect the pressure of the water column acting on said lower portion of the discharge conduit, said machine being adapted to perform at least a washing cycle comprising at least a rinsing phase.
  • the present invention relies essentially on the discovery that the signal coming from said sensing means during a typical washing cycle, which is however performed without any detergent being added in order to more effectively illustrate on a comparative basis the process being described, is a signal that varies at a high frequency and oscillates about a mean value which however remains absolutely constant, as this can be seen in Figure 2 where such a mean value is represented by the straight line "A".
  • oscillations of this signal represent the rapid pressure variations taking place on the bottom of the conduit as brought about by the agitation of the surface of the water which is in turn displaced continuously by the movement of the drum.
  • Such a behaviour represents the progressive pressure increase brought about by the continuous foam formation caused by the high-sudsing detergent product.
  • the present invention consists therefore in providing sensing means to detect the pressure on the bottom of either the tub or the discharge conduit, said means being adapted to deliver signals being representative of said pressure to processing means 7 arranged to handle such signals, said means being capable of determining the mean value of such a pressure during pre-defined periods of time.
  • Said means are also adapted to store said mean pressure values, as they are successively worked out by them, and compare them with each other to find out the difference. Finally, if they find out that the difference between subsequent values is greater than a pre-established value, said means are adapted to deliver corresponding commands to the controls and functional parts of the machine so as to correspondingly modify the process parameters of the washing cycle and/or the subsequent rinsing cycles in view of reducing or eliminating the excessive production of foam or the effects thereof.
  • processing, storage and control means which are typically electronic means associated to a microprocessor, are easily implemented by anyone skilled in the art, so that no further explanation or description will be given of their nature, construction and operating modes. On the contrary, the fundamental functions of such means, which are an integral part of the present invention, will be described in greater detail.
  • a first such improvement consists in systematically monitoring the mean pressure value at pre-defined intervals of time, storing such value and comparing it with the value that its worked out subsequently. If the difference emerging from such a comparison is greater than a pre-determined value, so as to therefore indicate a situation of "too much foam" being developed in the tub on the basis of both theoretical considerations and practical tests, said means will then automatically determine a reduction in the rotating speed of the drum, so as to reduce the resulting foam formation accordingly.
  • Another such improvement which may be implemented at the same time as or contextually with the above cited one, consists in causing the number of rinses to be correspondingly increased, since regularly provided rinses might not be adequately effective to handle such a "too much foam" situation.
  • still another improvement consists in causing the amount of rinsing water filled in to be increased in connection with one or more of the regularly provided rinses, so as to more effectively remove the excessive amount of foam from the washload.
  • a further improvement consists in using said "too much foam" information generated by said control means to activate some appropriate form of alarm or attention-arousing contrivance for the user, so that he or she is enabled to duly take the irregular condition into account and possibly take the corrective steps as necessary, by for instance interrupting the washing cycle prematurely, causing part of the washing liquor to be discharged before the proper time, causing one or more rinses to be repeated, etc., according to the circumstances and the possibilities offered by the machine in this connection.
  • Such an information may be in the form of any signal-conveying contrivance adapted to be adequately perceived by the user, such as an acoustic or optical alarm, a combination thereof, or another type or signal yet which may or may not be associated with an interruption of the operation of the machine.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Control Of Washing Machine And Dryer (AREA)
EP96100503A 1995-01-25 1996-01-16 Waschmaschine mit Vorrichtung zur Schaumverminderung Withdrawn EP0724036A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT95PN000008A IT1282409B1 (it) 1995-01-25 1995-01-25 Macchina lava-asciugabiancheria con dispositivo antischiuma
ITPN950008 1995-01-25

Publications (1)

Publication Number Publication Date
EP0724036A1 true EP0724036A1 (de) 1996-07-31

Family

ID=11394987

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96100503A Withdrawn EP0724036A1 (de) 1995-01-25 1996-01-16 Waschmaschine mit Vorrichtung zur Schaumverminderung

Country Status (2)

Country Link
EP (1) EP0724036A1 (de)
IT (1) IT1282409B1 (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0984092A1 (de) * 1998-09-02 2000-03-08 Miele & Cie. GmbH & Co. Waschmaschine mit einer Einrichtung zur Ermittlung des Wäschegewichtes
WO2007099112A1 (en) * 2006-03-01 2007-09-07 Arcelik Anonim Sirketi A washing machine
DE102007033492A1 (de) * 2007-07-18 2009-01-22 BSH Bosch und Siemens Hausgeräte GmbH Verfahren zur Steuerung der Schaumerzeugung in einer Waschmaschine sowie hierzu geeignete Waschmaschine
WO2009016009A1 (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
WO2009033980A1 (de) * 2007-09-10 2009-03-19 BSH Bosch und Siemens Hausgeräte GmbH Verfahren zur erkennung von schaum in einer trommelwaschmaschine und hierzu geeignete trommelwaschmaschine
DE102011052619A1 (de) * 2010-10-15 2012-04-19 Whirlpool Corporation Verfahren und vorrichtung zum ermitteln eines überschäumzustands
US8844082B2 (en) 2010-12-14 2014-09-30 Whirlpool Corporation Laundry treating appliance with biofilm treating cycle
EP3318670A1 (de) 2016-11-08 2018-05-09 BSH Hausgeräte GmbH Verfahren zum betrieb einer waschmaschine mit schaumdetektion und für dieses verfahren geeignete waschmaschine

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2325586A1 (de) * 1973-05-19 1974-12-05 Miele & Cie Wasch- oder geschirrspuelmaschine mit einer einrichtung zur vermeidung des ueberschaeumens
EP0268155A2 (de) * 1986-11-11 1988-05-25 Licentia Patent-Verwaltungs-GmbH Waschmaschine mit Vorrichtung zur Vermeidung von Schaumbildung
EP0278239A1 (de) * 1987-02-09 1988-08-17 Bosch-Siemens HausgerÀ¤te GmbH Verfahren zum automatischen Waschen von Wäsche
DE4104151A1 (de) * 1991-02-12 1992-08-13 Miele & Cie Waeschebehandlungsmaschine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2325586A1 (de) * 1973-05-19 1974-12-05 Miele & Cie Wasch- oder geschirrspuelmaschine mit einer einrichtung zur vermeidung des ueberschaeumens
EP0268155A2 (de) * 1986-11-11 1988-05-25 Licentia Patent-Verwaltungs-GmbH Waschmaschine mit Vorrichtung zur Vermeidung von Schaumbildung
EP0278239A1 (de) * 1987-02-09 1988-08-17 Bosch-Siemens HausgerÀ¤te GmbH Verfahren zum automatischen Waschen von Wäsche
DE4104151A1 (de) * 1991-02-12 1992-08-13 Miele & Cie Waeschebehandlungsmaschine

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0984092A1 (de) * 1998-09-02 2000-03-08 Miele & Cie. GmbH & Co. Waschmaschine mit einer Einrichtung zur Ermittlung des Wäschegewichtes
WO2007099112A1 (en) * 2006-03-01 2007-09-07 Arcelik Anonim Sirketi A washing machine
CN101755087B (zh) * 2007-07-18 2012-12-19 Bsh博世和西门子家用器具有限公司 控制洗衣机内泡沫产生的方法以及适于该方法的洗衣机
DE102007033492A1 (de) * 2007-07-18 2009-01-22 BSH Bosch und Siemens Hausgeräte GmbH Verfahren zur Steuerung der Schaumerzeugung in einer Waschmaschine sowie hierzu geeignete Waschmaschine
US8601625B2 (en) 2007-07-18 2013-12-10 Bsh Bosch Und Siemens Hausgeraete Gmbh Method for controlling the generation of suds in a washing machine and a washing machine suitable therefor
US20100192310A1 (en) * 2007-07-18 2010-08-05 BSH Bosch und Siemens Hausgeräte GmbH Method for controlling the generation of suds in a washing machine and a washing machine suitable therefor
WO2009016009A1 (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
US8510887B2 (en) 2007-08-01 2013-08-20 Bsh Bosch Und Siemens Hausgeraete Gmbh Method for eliminating foam in a drum washing machine and drum washing machine suitable therefor
WO2009033980A1 (de) * 2007-09-10 2009-03-19 BSH Bosch und Siemens Hausgeräte GmbH Verfahren zur erkennung von schaum in einer trommelwaschmaschine und hierzu geeignete trommelwaschmaschine
DE102011052619A1 (de) * 2010-10-15 2012-04-19 Whirlpool Corporation Verfahren und vorrichtung zum ermitteln eines überschäumzustands
US9127392B2 (en) 2010-10-15 2015-09-08 Whirlpool Corporation Method and apparatus to detect an over-suds condition
US8844082B2 (en) 2010-12-14 2014-09-30 Whirlpool Corporation Laundry treating appliance with biofilm treating cycle
EP3318670A1 (de) 2016-11-08 2018-05-09 BSH Hausgeräte GmbH Verfahren zum betrieb einer waschmaschine mit schaumdetektion und für dieses verfahren geeignete waschmaschine
WO2018086859A1 (en) 2016-11-08 2018-05-17 BSH Hausgeräte GmbH Process for the operation of a washing machine with foam detection and washing machine suitable for this process

Also Published As

Publication number Publication date
ITPN950008A0 (it) 1995-01-25
IT1282409B1 (it) 1998-03-23
ITPN950008A1 (it) 1996-07-25

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