EP0711860B1 - Phase d'essorage d'une machine à laver le linge - Google Patents

Phase d'essorage d'une machine à laver le linge Download PDF

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Publication number
EP0711860B1
EP0711860B1 EP95116722A EP95116722A EP0711860B1 EP 0711860 B1 EP0711860 B1 EP 0711860B1 EP 95116722 A EP95116722 A EP 95116722A EP 95116722 A EP95116722 A EP 95116722A EP 0711860 B1 EP0711860 B1 EP 0711860B1
Authority
EP
European Patent Office
Prior art keywords
spin
level
washing machine
extraction phase
drain pump
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.)
Expired - Lifetime
Application number
EP95116722A
Other languages
German (de)
English (en)
Other versions
EP0711860A1 (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
Electrolux Zanussi 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, Electrolux Zanussi SpA filed Critical Electrolux Zanussi Elettrodomestici SpA
Publication of EP0711860A1 publication Critical patent/EP0711860A1/fr
Application granted granted Critical
Publication of EP0711860B1 publication Critical patent/EP0711860B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • D06F33/00—Control of operations performed in washing machines or washer-dryers 
    • D06F33/30—Control of washing machines characterised by the purpose or target of the control 
    • D06F33/32—Control of operational steps, e.g. optimisation or improvement of operational steps depending on the condition of the laundry
    • D06F33/40—Control of operational steps, e.g. optimisation or improvement of operational steps depending on the condition of the laundry of centrifugal separation of water from the laundry
    • 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
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/18—Washing liquid level
    • 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
    • D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
    • D06F2105/08—Draining of washing liquids

Definitions

  • the present invention refers to a clothes washing machine, in particular a household-type clothes washing machine, provided with improved means for performing the spin-extraction phase of its washing cycle.
  • Washing machines are known in the art, which operate under control of means adapted to control the sequence of their operating cycle that usually comprises, at the end of the washing and rinsing phases, a spin-extraction phase performed at a high revolution speed of the rotating drum so as to remove as much moisture as possible from the washload in view of reducing as much as possible the time required for subsequently drying the clothes, regardless of the manner in which such drying is actually performed, ie. whether it is done in a power-operated clothes drying machine or in a more traditional way by spreading and hanging the clothes on the line in a dry environment.
  • Said spin-extraction phase is controlled by said programme sequence controlling means which determine the spin-extraction time that, since it is pre-set in said programme sequence controlling means, has a fixed length and does therefore not take into any account the actual degree of moisture removal reached by the washload during the spin-extraction phase.
  • the document EP - A - 0 553 645 discloses a washing machine provided of a spinning-drying phase during which the drain pump is disconnected after a pre-defined period of time, and the period of time between the instant time of pump disconnected and the instant time in which the water lewel reaches a pre-defined lewel is measured.
  • a solution shows the drawback that, in order the wring-out be really completed after the end of the spinning phase, said phase has to last for a period predetermined rather prolonged and therefore non needed for the most used cases/loads.
  • the drain pump is again started for a fixed period, what may be too lasting for the complete wring-out.
  • the described clothes washing machine comprises a washing tub 1, a rotating drum 2 arranged within said washing tub and adapted to hold the washload 3, an electric motor (not shown) connected with said rotating drum and adapted to drive it at variable, pre-selectable revolution speeds.
  • an outlet conduit 5 which is arranged in a substantially vertical manner and is adapted to communicate, at its upper end, with the inside of said tub, a drain pump 6 being further connected therewith at its lower end.
  • said drain pump is kept constantly operating so as to enable it to continuously exhaust the water as it is extracted from the washload owing to the centrifugal force imparted by the high-speed rotation of the drum, said water falling down onto the bottom of the tub and entering the thereto connected outlet conduit which in turn delivers it to said pump.
  • the present invention starts from the practical observation that, when a spin-extraction phase is started, there is a continuous downflow of water occurring in said outlet conduit 5, while the flow rate of said water tends to progressively diminish as the amount of residual moisture in the washload undergoing spin-extraction becomes smaller.
  • the flow rate of the drain pump is usually greater than the actual flow of water brought about by a spin-extraction and this, once that the initial transient state when the washing tub is being emptied, is instrumental in preventing a head of spin-extracted water from forming inside said conduit above the drain pump.
  • the invention consists in causing the operation of the drain pump to be stopped in a sequence of successive moments t1, t2, ...tn for correspondingly pre-set periods of time S1, S2, ...Sn, while the actual spin-extraction action is on the contrary allowed to go on uninterruptedly in the usual way.
  • the spin-extraction phase may be considered as being concluded when the rate of flow of the spin-extracted water from the washload decreases below a pre-determined value, it will in such a case be possible to correlate said rate of flow of the spin-extracted water with the amount of water let into the outlet conduit and not ejected therefrom by the drain pump at the end of given intervals and, as a result, with the highest level attained each time by the water head during said intervals.
  • an analogue level sensor such as an analalogue pressure switch widely available on the market, connected through a bell-type trap 9 to a point situated in the lower portion of said conduit, as well as processing, storage and control means (not shown) suitably connected to the driving motor, the drain pump and said analogue level sensor 8, to define a whole set of such operating conditions that, when checked and processed, they can be considered as actually representing the desired "wring-out" condition of the washload and can therefore be used to cause the motor driving the rotating drum at its high spin-extraction speed to automatically stop its operation.
  • an analogue level sensor such as an analalogue pressure switch widely available on the market
  • a clothes washing machine which is equipped in the above indicated manner is actually enabled to continuously monitor the progressive evolution of the spin-extraction action on the washload, and the resulting gradual reduction of the flow of water extracted from the washload, through a sequence of successive measurements of the amount of water being let into the outlet conduit, as well as to automatically stop the spin-extraction phase as soon as the desired water removal from the washload is attained, thereby preventing said spin-extraction phase from being protracted unnecessarily.
  • a first variant may consist in detecting and processing not the highest absolute height reached by the water head at the end of the various intervals, ie. the periods of time during which the operation of the drain pump is discontinued, but the differences between the highest absolute heights Z1, Z2 detected at the end of two successive intervals, for a plurality of pairs of such successive intervals.
  • Such a variant has the advantage that the difference between successive highest levels attained by the water head in the outlet conduit eliminates by compensation all factors that may undesirably affect the highest level attainable by said water head and, therefore, cause a wrong information to be detected by the system.
  • a second variant consists in arranging things so that said periods of time S1, S2, ...Sn are not equal to each other, as this would certainly be much simpler to implement, but have a differing length instead, said length preferably increasing in a progressive manner for the periods of time following the first one.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Control Of Washing Machine And Dryer (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)
  • Centrifugal Separators (AREA)

Claims (4)

  1. Machine à laver le linge comprenant une cuve de lavage (1), un tambour (2) agencé de façon à pouvoir tourner à l'intérieur de ladite cuve et prévu pour contenir la charge de lavage (3), un moteur électrique capable d'entraíner en rotation ledit tambour à des vitesses de rotation différentes incluant la vitesse d'essorage, un conduit de sortie (5) prévu sous ladite cuve de lavage, des moyens analogiques de mesure de niveau (8) prévus pour mesurer le niveau d'eau existant dans ledit conduit de sortie (5), une pompe de drainage (6) prévue pour expulser vers l'extérieur la liqueur contenue dans ledit conduit, des moyens de commande, de stockage et de traitement interrompant, pendant la phase d'essorage, le fonctionnement de ladite machine à laver, caractérisée en ce que, pendant la phase d'essorage, le fonctionnement de ladite pompe de drainage (5) est interrompu en correspondance avec une pluralité d'instants successifs (t1, t2, ...tn) pendant des périodes de temps prédéfinies de façon correspondante (S1, S2 ...Sn), ladite phase d'essorage étant en outre interrompue lorsque le niveau de la colonne d'eau (Z) détectée par lesdits moyens de mesure de niveau (8) à la fin desdites périodes de temps s'abaisse en dessous d'une valeur prédéterminée.
  2. Machine à laver le linge comprenant une cuve de lavage (1), un tambour (2) agencé de façon à pouvoir tourner à l'intérieur de ladite cuve et prévu pour contenir la charge de lavage (3), un moteur électrique capable d'entraíner en rotation ledit tambour à des vitesses de rotation différentes incluant la vitesse d'essorage, un conduit de sortie (5) prévu sous ladite cuve de lavage, des moyens analogiques de mesure de niveau (8) prévus pour mesurer le niveau d'eau existant dans ledit conduit de sortie (5), une pompe de drainage (6) prévue pour expulser vers l'extérieur la liqueur contenue dans ledit conduit, des moyens de commande, de stockage et de traitement interrompant, pendant la phase d'essorage, le fonctionnement de ladite machine à laver, caractérisée en ce que, pendant la phase d'essorage, le fonctionnement de ladite pompe de drainage (5) est interrompu en correspondance avec une pluralité d'instants successifs (t1, t2, ...tn) pendant des périodes de temps prédéfinies de façon correspondante (S1, S2, ...Sn) , la valeur du niveau atteint par la colonne d'eau (Z2) étant détectée et stockée par lesdits moyens de mesure de niveau (8) à la fin de chaque intervalle d'interruption de la pompe de drainage, ladite valeur du niveau de la colonne d'eau étant ensuite comparée à la valeur du niveau atteint par la colonne d'eau (Z1) lors de l'intervalle d'interruption précédent, et ladite phase d'essorage étant interrompue lorsque la différence entre les valeurs du niveau desdites colonnes d'eau (Z1, Z2) est inférieure à une valeur préétablie.
  3. Machine à laver le linge selon la revendication 1 ou 2, caractérisée en ce que lesdites périodes de temps (S1, S2, ...Sn) ont une longueur qui croít progressivement pour les périodes qui font suite à la première.
  4. Machine à laver le linge selon l'une quelconque des revendications précédentes, caractérisée en ce que lesdits moyens analogiques de mesure de niveaux (8) sont des commutateurs de pression analogiques couplés à un piège à air du type en cloche (9) relié à un point inférieur dudit conduit de sortie.
EP95116722A 1994-11-08 1995-10-24 Phase d'essorage d'une machine à laver le linge Expired - Lifetime EP0711860B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT94PN000066A IT1267594B1 (it) 1994-11-08 1994-11-08 Lavabiancheria con fase di centrifuga perfezionata
ITPN940066 1994-11-08

Publications (2)

Publication Number Publication Date
EP0711860A1 EP0711860A1 (fr) 1996-05-15
EP0711860B1 true EP0711860B1 (fr) 1998-12-30

Family

ID=11394959

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95116722A Expired - Lifetime EP0711860B1 (fr) 1994-11-08 1995-10-24 Phase d'essorage d'une machine à laver le linge

Country Status (4)

Country Link
EP (1) EP0711860B1 (fr)
DE (1) DE69507000T2 (fr)
ES (1) ES2128631T3 (fr)
IT (1) IT1267594B1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20010061252A (ko) * 1999-12-28 2001-07-07 구자홍 세탁기용 배수펌프 제어방법
EP2236660B1 (fr) * 2005-11-18 2016-08-03 LG Electronics Inc. Machine à laver permettant une stérilisation faisant appel à un rayonnement ultraviolet et méthode de lavage par stérilisation associée
ITTO20091022A1 (it) 2009-12-22 2011-06-23 Indesit Co Spa Macchina lavabiancheria con centrifuga
CN106811916B (zh) * 2015-12-02 2020-10-09 青岛海尔滚筒洗衣机有限公司 一种洗衣机的排水方法
CN113906178A (zh) * 2019-06-18 2022-01-07 韦斯特尔电子工业和贸易有限责任公司 洗衣机和操作方法

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4012115A1 (de) * 1990-04-14 1991-10-17 Licentia Gmbh Verfahren zum schleudern von waesche in einer programmgesteuerten haushaltsmaschine
IT1259201B (it) * 1992-01-28 1996-03-11 Zanussi Elettrodomestici Dispositivo di controllo della fase di centrifugazione per macchina lavatrice di biancheria

Also Published As

Publication number Publication date
ES2128631T3 (es) 1999-05-16
IT1267594B1 (it) 1997-02-07
DE69507000T2 (de) 1999-06-10
ITPN940066A0 (it) 1994-11-08
DE69507000D1 (de) 1999-02-11
ITPN940066A1 (it) 1996-05-08
EP0711860A1 (fr) 1996-05-15

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