EP1978143A2 - Appareil de lavage - Google Patents

Appareil de lavage Download PDF

Info

Publication number
EP1978143A2
EP1978143A2 EP08004756A EP08004756A EP1978143A2 EP 1978143 A2 EP1978143 A2 EP 1978143A2 EP 08004756 A EP08004756 A EP 08004756A EP 08004756 A EP08004756 A EP 08004756A EP 1978143 A2 EP1978143 A2 EP 1978143A2
Authority
EP
European Patent Office
Prior art keywords
washing
washing liquid
level
drainage pump
drainage
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
Application number
EP08004756A
Other languages
German (de)
English (en)
Other versions
EP1978143A3 (fr
EP1978143B1 (fr
Inventor
Costantino Mariotti
Giovanni Bombardieri
Savio La Bella
Luca Cesari
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.)
Whirlpool EMEA SpA
Original Assignee
Indesit Co 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 Indesit Co SpA filed Critical Indesit Co SpA
Priority to PL08004756T priority Critical patent/PL1978143T3/pl
Publication of EP1978143A2 publication Critical patent/EP1978143A2/fr
Publication of EP1978143A3 publication Critical patent/EP1978143A3/fr
Application granted granted Critical
Publication of EP1978143B1 publication Critical patent/EP1978143B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • D06F33/42—Control of operational steps, e.g. optimisation or improvement of operational steps depending on the condition of the laundry of draining
    • 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 
    • D06F39/08—Liquid supply or discharge arrangements
    • D06F39/083—Liquid discharge or recirculation arrangements
    • D06F39/085—Arrangements or adaptations of pumps
    • 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 
    • D06F39/08—Liquid supply or discharge arrangements
    • D06F39/087—Water level measuring or regulating devices
    • 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

Definitions

  • This invention relates to a washing appliance, in particular a washing appliance equipped with a system designed to prevent noise from being produced by the drainage pump under certain working conditions.
  • Washing appliances comprise electrical appliances such as, for example:
  • washing appliances called “laundry washers” are suitable for carrying out at least a washing treatment on textile articles made of any fibre or in any colour and include machines known as “washing machines” and machines known as “washer dryers”, if in addition to washing they also carry out at least a treatment for drying textile articles.
  • washing machines comprising a washing tank with a drum in which the laundry to be washed is placed.
  • a pipe for draining the washing tank extends from the washing tank.
  • the drainage pipe is connected to a drainage pump through which the washing water from the washing tank is pumped. After the main washing treatment and after each rinse, the washing water used is drained out of the tank.
  • an electronic circuit board activates the drainage pump for a preset length of time.
  • This invention has for an aim to overcome the above mentioned disadvantages by providing a washing appliance which prevents the drainage pump from producing unpleasant noise under certain working conditions.
  • Another aim of the invention is to provide a washing tank that optimizes the operation of some of the components of the washing appliance.
  • a further aim of the invention is to provide a washing appliance that reduces power consumption.
  • a yet further aim of the invention is to provide a washing appliance that allows the above aims to be achieved with only minor modifications to the basic structure of prior art washers.
  • Figure 1 is a schematic view of a washer according to this invention.
  • the numeral 1 denotes a washing appliance that uses a washing liquid.
  • the washing liquid usually consists of a mixture of water and cleaning agents such as detergents and other washing aids (bleach, fabric softener, etc).
  • the washing appliance 1 may be one of several different kinds of machine but in the preferred embodiment it is a laundry washer or a dishwasher.
  • the washing appliance 1 is designed preferably for household use.
  • the washing appliance 1 comprises a washing tank 2 suitable for containing the washing liquid used for the washing treatment. Inside the washing tank 2, the washing appliance 1 also comprises means 7 for containing the articles to be washed, said containing means 7 defining at least a space for accommodating the articles to be washed.
  • the containing means 7 comprise a rotary drum in which the laundry to be washed is placed.
  • the containing means 7 comprise one or more racks which can usually be pulled out by means of suitable carriages.
  • the washing appliance 1 also comprises:
  • the drainage pipe 3 advantageously extends from the bottom portion of the washing tank 2; during drainage, the washing liquid flows out through the drainage pipe 3 under the action of the drainage pump 6.
  • the drainage pump 6 normally used is a centrifugal pump.
  • the drainage pump 6 is suitably mounted on the drainage pipe 3 and is designed in such a way that the washing liquid flows through it during its operation.
  • the drainage pipe 3 extends both upstream and downstream of the drainage pump 6.
  • the washing appliance 1 comprises means 5, operatively connected to the detecting means 4, for controlling the drainage pump 6.
  • the detecting means 4 detect a first condition where the water level is less than or equal to a first predetermined level.
  • the control means 5 inhibit the operation of the drainage pump 6 upon occurrence of the first condition sensed by the detecting means 4.
  • the detecting means 4 apply a first condition detected signal to the control means 5, either directly or indirectly.
  • the detecting means 4 sense the level of the free surface of the column and compare it with a predetermined reference level.
  • the predetermined reference level is below the level of the free surface of the column and, in particular, is located below the first predetermined level.
  • control means 5 inhibit the operation of the drainage pump 6 upon occurrence of the first condition.
  • washing cycle is meant the pre-wash step, if any, the rinse step, if any, and the main wash step in their entirety.
  • the predetermined part of the washing cycle in which the control means 5 inhibit the operation of the drainage pump 6 might not include the final step of draining the washing liquid, this step being usually associated with the final rinse. That is because, in the final drainage step, to enable as much washing liquid as possible to be drained out, it may be necessary to set the timer of the drainage pump 6 so that the pump operates for a slightly extended length of time.
  • the washing liquid constitutes a liquid barrier to the air inside the drainage pipe 3.
  • the barrier is at least partly upstream of the drainage pump 6 relative to the direction in which the washing liquid flows out of the washing tank 2 during its drainage.
  • the barrier obstructs at least a full section of the drainage pipe 3 upstream of the drainage pump 6 and thereby prevents the drainage pump 6 from sucking in air, in addition to the washing liquid, from the washing tank 2.
  • the washing appliance 1 comprises an interface connecting a suction zone 60 of the pump 6 to the drainage pipe 3, said interface being fully immersed in the washing liquid when the first predetermined level occurs.
  • the first predetermined level of the free surface is between 0 and 30 mm above a minimum level necessary for the interface to be fully immersed in the washing liquid.
  • the first predetermined level is preset at a level of the free surface of around 20 mm above the minimum level necessary for the interface to be fully immersed in the washing liquid. This provides a good safety margin and minimizes the risk of the drainage pump 6 sucking in air together with the washing liquid.
  • the control means 5 start the drainage pump 6 upon occurrence of a predetermined second condition after the first condition, the occurrence of the second condition being sensed by the detecting means 4; the detecting means 4 appropriately applying a second condition detected signal to the control means 5, either directly or indirectly.
  • the level of the washing liquid column upstream of the drainage pump 6 is on the rise.
  • the level of the free surface is greater than or equal to a second predetermined level, which is greater than the first predetermined level and smaller than any other level such that the space that accommodates the articles to be washed would be at least partly immersed in the washing liquid to be drained out.
  • the occurrence of the second condition is typical of a laundry washer but is not usual in dishwashers. That is because in laundry washers, during the step in which the drainage pump is in operation or after the occurrence of the first condition, there may be a spin-drying step during which more washing liquid may accumulate at the bottom of the washing tank 2, which must be disposed of and which must not come into contact with the articles in the drum again. It is also important that the drum be free to rotate without coming into contact with the washing liquid to be drained out from the washing tank 2: given the high rotation speeds of the drum, this is particularly true during spin-drying also to prevent noise from being produced.
  • the second predetermined level is between 1 and 20 mm below the level in which the washing liquid reaches the space of the containing means 7 where the articles to be washed are placed.
  • the second predetermined level is preset at a level of the free surface of around 15 mm below the level in which the washing liquid reaches the space of the containing means 7 where the articles to be washed are placed. This prevents the washing liquid at the bottom of the washing tank from coming into contact with the articles to be washed in the containing means 7.
  • the control means 5 are inhibited.
  • the drainage pump 6 is not activated at the wrong time for example when the washing liquid must not be drained out.
  • the detecting means 4 comprise a pressure sensor 40.
  • the pressure sensor 40 can continuously measure the level of the free surface of the washing liquid with respect to the reference level located below the free surface.
  • the pressure sensor 40 comprises what in the trade is commonly known as "linear pressure switch".
  • the pressure sensor 40 also makes it possible to control the washing liquid level during the step of feeding the washing liquid into the washing tank 2 and/or provides prior warning of the risk of the washing liquid overflowing from the washing tank 2.
  • the use of a pressure sensor 40 that continuously measures the level of the free surface is highly advantageous and makes it unnecessary to fit an additional bistable pressure switch. Bistable pressure switches are normally used in traditional washing machines to control the level of washing liquid during the feeding of washing liquid into the washing tank 2.
  • the pressure sensor 40 that continuously measures the level of the free surface comprises a measuring point 41 located upstream of the drainage pump 6 relative to the direction in which the washing liquid flows out of the washing tank 2 during its drainage.
  • the measuring point 41 is fully immersed in the washing liquid column.
  • the above mentioned predetermined reference level is at the same level as the measuring point 41.
  • the measuring point 41 is made on the drainage pipe 3.
  • the pressure sensor 40 that continuously measures the level of the free surface associates a specific command with the detection of each of at least four predetermined levels that occur during the normal and correct operation of the washing appliance: the occurrence of the first and second predetermined level during a predetermined part of the washing cycle is associated, respectively, with the starting and stopping of the drainage pump 6; the occurrence of a third and fourth predetermined level during a predetermined part of the washing cycle respectively enables and inhibits the feeding of the washing liquid into the washing tank 2.
  • the occurrence of the third predetermined level while the washing liquid is being drained out does not start washing liquid feed.
  • the occurrence of the second predetermined level while the washing liquid is being fed into the washing tank 2 out does not start the drainage pump 6.
  • the first, second, third and fourth levels might be associated with a height of the free surface of the washing liquid column of 15mm, 30mm, 60mm and 90mm from the measuring point 41, respectively.
  • the pressure sensor 40 might also be used to detect a fifth level indicating a fault or excessively high level of washing liquid in the washing tank 2.
  • the fifth level is normally associated with counteractions such as immediate activation of the drainage pump 6 to prevent the water from overflowing from the washing tank.
  • the drainage pump 6 is started in order to drain out the washing liquid.
  • the detecting means 4 stop the drainage pump 6.
  • this step is usually followed by a spin-drying step during which a certain amount of washing liquid is released by the washed laundry and settles at the bottom of the washing tank 2: as a result, the washing liquid level in the washing tank 2 rises.
  • the detecting means 4 sense that the washing liquid in the washing tank 2 has reached a predetermined level associated with a second condition, the drainage pump is started again to drain out the washing liquid that has accumulated.
  • the invention brings important advantages.
  • the embodiments of the invention may be made from any material, and in any size, depending on requirements.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Control Of Washing Machine And Dryer (AREA)
  • Washing And Drying Of Tableware (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)
  • Cleaning In General (AREA)
  • Centrifugal Separators (AREA)
EP08004756.6A 2007-04-05 2008-03-14 Appareil de lavage Not-in-force EP1978143B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL08004756T PL1978143T3 (pl) 2007-04-05 2008-03-14 Urządzenie piorące

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT000021A ITRN20070021A1 (it) 2007-04-05 2007-04-05 Macchina di lavaggio.

Publications (3)

Publication Number Publication Date
EP1978143A2 true EP1978143A2 (fr) 2008-10-08
EP1978143A3 EP1978143A3 (fr) 2010-02-24
EP1978143B1 EP1978143B1 (fr) 2013-10-16

Family

ID=39731081

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08004756.6A Not-in-force EP1978143B1 (fr) 2007-04-05 2008-03-14 Appareil de lavage

Country Status (4)

Country Link
EP (1) EP1978143B1 (fr)
IT (1) ITRN20070021A1 (fr)
PL (1) PL1978143T3 (fr)
RU (1) RU2474631C2 (fr)

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU673679A1 (ru) * 1976-01-30 1979-07-15 Центральное Конструкторское Бюро Коммунального Машиностроения Устройство дл фильтрации растворител в машинах химчистки
SU1733540A1 (ru) * 1990-01-08 1992-05-15 Б.З.Мальцев и В.Ф.Кузнецов Стиральна машина
AU2447599A (en) * 1999-02-08 2000-08-25 Arcelik A.S. Washing machine with a suppressed discharge-pump noise
JP2001070693A (ja) * 1999-09-03 2001-03-21 Sanyo Electric Co Ltd 電気洗濯機
US6481246B1 (en) * 2000-07-19 2002-11-19 Maytag Corporation Drain pump mounted pressure switch for a washing machine
DE10161300B4 (de) * 2001-12-13 2006-08-03 BSH Bosch und Siemens Hausgeräte GmbH Wäschebehandlungsmaschine in Form einer Waschmaschine oder eines Wäschetrockners
KR20050045260A (ko) * 2003-11-10 2005-05-17 삼성전자주식회사 수위감지장치가 구비된 드럼세탁기
ITTO20050365A1 (it) * 2005-05-30 2006-11-30 Indesit Co Spa Macchina di lavaggio con valvola antiriflusso
KR20070002538A (ko) * 2005-06-30 2007-01-05 엘지전자 주식회사 드럼세탁기의 배수펌프 제어방법

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None

Also Published As

Publication number Publication date
ITRN20070021A1 (it) 2008-10-06
EP1978143A3 (fr) 2010-02-24
RU2474631C2 (ru) 2013-02-10
RU2008112901A (ru) 2009-10-10
EP1978143B1 (fr) 2013-10-16
PL1978143T3 (pl) 2014-04-30

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