EP0222264A2 - Waschmaschine - Google Patents

Waschmaschine Download PDF

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Publication number
EP0222264A2
EP0222264A2 EP86115048A EP86115048A EP0222264A2 EP 0222264 A2 EP0222264 A2 EP 0222264A2 EP 86115048 A EP86115048 A EP 86115048A EP 86115048 A EP86115048 A EP 86115048A EP 0222264 A2 EP0222264 A2 EP 0222264A2
Authority
EP
European Patent Office
Prior art keywords
conduit
collector receptacle
receptacle
washing
liquid
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Withdrawn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
EP86115048A
Other languages
English (en)
French (fr)
Other versions
EP0222264A3 (de
Inventor
Piero Babuin
Giuseppe Cargnel
Francesco Nodassi
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.)
Industrie Zanussi SpA
Original Assignee
Industrie Zanussi SpA
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 Industrie Zanussi SpA, Zanussi Elettrodomestici SpA filed Critical Industrie Zanussi SpA
Publication of EP0222264A2 publication Critical patent/EP0222264A2/de
Publication of EP0222264A3 publication Critical patent/EP0222264A3/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Withdrawn legal-status Critical Current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 
    • D06F39/04—Heating arrangements

Definitions

  • the present invention relates to a laundry washing machine of the type in which the washing of the laundry is carried out by the irrigation thereof with a washing liquid collected in a receptacle communicating with lower and upper portions of a washing chamber in a recirculation system.
  • Laundry washing machines of this type are further provided with an electric recirculation pump and a discharge pump connected respectively to the recirculation conduit and a discharge conduit of the machine for repeatedly recircul­ating the washing liquid from the collector receptacle to the washing chamber and for discharging the liquid at the end of the washing cycle, respectively.
  • a washing machine of this type permits the laundry to be laundered efficiently with a reduced volume of washing liquid, resulting in corresponding savings of water, detergents and electric energy, they require on the other hand a highly accurate calibration of the thermostatic sensor and the accurate positioning of the sensor in the collector receptacle so as to ensure accurate control of the temperature of the liquid in the course of different washing programmes.
  • thermo­static sensor is therefore empirically adjusted to respond to a temperature above that to which the liquid is to be actually heated, and is placed in the collector receptacle at the level of the higher layers of the liquid contained therein.
  • the responding temperature of the thermo­static sensor is selected to coincide with the heating of the washing liquid in the collector receptacle to a mean temperature corresponding to the temperature required for carrying out any specific washing programme.
  • air bubbles formed in the washing liquid by the partial ebullition of the upper liquid layers may enter the intake of the recirculation pump to form an air-lock therein.
  • the steam may also enter the pressure-sensing dome of a pressure switch communicating for instance with an upper portion of the above-mentioned flexible connecting hose so as to progressively displace or entrain the air contained therein, resulting in an increasingly faulty response of the pressure switch.
  • the detergent deposited on the bottom of the collector receptacle is itself lost to the laundering process and cannot be usefully reclaimed.
  • the heater element would be con­tinuously energized, resulting in a continuous rise of the temperature of the laundering liquid up to its boiling point.
  • the thus excessively heated liquid in the collector receptacle would progressively evaporate, resulting in a further drop of the liquid level until the heater element would be exposed to air. This would again result in over­heating of the heater element, with the danger of damage to the heater element itself and other parts of the laundry washing machine.
  • the washing machine ensures efficient reclamation of any detergents deposited on the bottom of the collector receptacle, and the discharge from the receptacle of any fibres and foreign bodies.
  • the machine is also provided with efficient safety features for protection against any malfuncion or damage of the heater element and the pressure switch.
  • a laundry washing machine comprising a washing chamber, a rotatable drum mounted in said chamber, and a washing liquid collector receptacle containing at least one filter element and communicating with a lower portion and an upper portion of said washing chamber through a flexible hose and a recirculation conduit and an electric recirculation pump, respectively, said collector receptacle additionally containing at least one electric heater element and thermostatic control means series-connected to said heater element and adjustable to control the heating of the washing liquid to selected temperatures.
  • the laundry washing machine according to the invention is characterized in that said collector receptacle addition strictlyally communicates with said electric recirculation pump through at least one further conduit effective during oper­ation of said recirculation pump to return part of the washing liquid to said collector receptacle, and in that said thermostatic control means is series-connected to another thermostatic control means having a fixed response temperature of preferably about 90 °C.
  • a laundry washing machine sub­stantially comprising a housing 5, a washing chamber 6 mounted within housing 5 in a per se known manner, and a drum 7 for containing the laundry and adapted to be rotated by an electric motor 8 of conventional type secured to a lower portion of washing chamber 6.
  • a detergent container 9 Housed in an upper portion of the 4 machine is a detergent container 9 connected to the water mains through a conduit 10 and a solenoid valve 11 and provided with a flexible hose 12 connected to washing chamber 6 for the introduct­ion thereinto of water and detergents.
  • washing chamber 6 is formed with an outlet opening 13 connected through a flexible hose 15 to a receptacle 15 for collecting the washing liquid draining from washing chamber 6, collector receptacle 15 communicating with the upper portion of washing chamber 6 through a conduit 16 connected to receptacle 15 through an electric recirculation pump 17.
  • Collector recept­acle 15 is designed to contain a fine-mesh filter element 18 of conventional type removably mounted in the receptacle for retaining particulate matter entrained by the washing liquid.
  • Collector receptacle 15 additionally accommodates at least one electric heater element 19 and two thermostats 20, 21 or similar sensors of conventional type adapted respectively to heat the washing liquid supplied to the receptacle and to control the temperature thereof.
  • heater element 19 is dimensioned so as to develop a considerable electric power for sufficiently rapid heating of the washing liquid, and is further adapted to be selectively energized for periods of varying duration under thermostatic control by thermostat 20.
  • Theremostat 20 is of the variably adjustable type and calibrated for a wide range of response temperatures comprised preferably between about 0 °C and 90 °C, permitt­ing the washing liquid to be heated to different temper­atures in the course of the laundering phases, depending on the nature of the laundry to be laundered.
  • Thermostat 21 on the other hand is of the fixed adjustment type and calibrated to an elevated response temperature of preferably about 90 °C so as to prevent the washing liquid from being heated beyond this maximum temperature.
  • thermostat 21 is operatively connected to thermostat 20 and heater element 19 in a manner to be described.
  • Collector receptacle 15 additionally communicates with electric recirculation pump 17 through a further conduit 22 connected to recirculation conduit 16 adjacent the outlet of recirculation 17, and with a flexible discharge hose 23 through a discharge pump 24 of the laundry washing machine operable to discharge the washing liquid from collector receptacle 15 to the exterior of the machine at the end of a washing cycle.
  • washing liquid taken from collector receptacle 15 is recirculated through conduit 16 to the interior of washing chamber 6, while part of this liquid is returned through conduit 22 into receptacle 15, resulting in a turbulent circulation of the washing liquid contained therein.
  • the temperature of the washing liquid can be reliably controlled with the aid of one or the other of thermostats 20, 21.
  • the turbulence also prevents the formation of deposits on the heater element 19 of fibres from the laundry or any foreign bodies of reduced dimensions which are not retained by filter element 18, and ensures the discharge of such fibres and foreign bodies at the end of each laundering programme, as will be described. This overcomes the danger of a progressive reduction of the heat exchange surface area of the heater element 19, and thus of the amount of heat transmitted therefrom to the washing liquid.
  • the useful lifetime of the heater element is extended while ensuring proper heating of the washing liquid in desirably short periods of time.
  • the described turbulence also prevents detergent solids of small dimensions not retained by filter element 18 from being deposited on the bottom of receptacle 15 and thus being lost to the laundering process. Quite to the contrary, these detergent particles are intermixed with the washing liquid and entrained therein to the washing chamber via recirculation conduit 16. In this manner all of the deterg­ent introduced into the washing chamber is efficiently osed.
  • collector receptacle 15 it is noted that it is finally provided with a vertical partition 25 formed in one piece with a respective top wall portion 26 adjacent filter element 18 and extending to a location close above the bottom 27 of receptacle 15 so as to define an opening 28 for communication between two chambers 29 and 30 of the receptacle separated from one another by the partition.
  • partition 25 within collector receptacle 15 Acts in the manner of a syphon permitting lose fibres and foreign bodies possibly depos­ited on bottom 27 of the receptacle to be discharged.
  • This operation is carried out at the end of a laundering cycle of the machine by stopping recirculation pump 17 and energizing discharge pump 24 so as to discharge the washing liquid and any substances deposited on bottom 27 from collector receptacle 15 down to a level determined by the passage 28 defined by partition 25.
  • the presence of the syphon formed by partition 25 ensures the efficient and practically complete discharge of such substances. This effect is not obtainable in the collector receptacles of known laundry washing machines, in which part of such substances always remains on the bottom of the receptacle.
  • the present laundry washing machine is also provided with at least one pressure switch 34 or similar liquid level control means acting to control the washing liquid supply to collector receptacle 15 to a reduced level.
  • pressure switch 34 communicates through a flexible hose 35 of reduced cross-section with a pressure sensing dome 36 itself formed integrally with collector receptacle 15 and a rectilinear tubular portion 37 adapted to be connected to washing chamber 6 of the machine through flexible hoe 14.
  • pressure sensing dome 36 is formed at a lateral position with respect to tubular portion 37 instead of at a location on the top wall 38 of this portion as in conventional embodiments.
  • pressure sensing dome 36 is dis­posed laterally of tubular portion 37 instead of on top thereof, any steam passing through tubular portion 37 connot possibly entrain any of the air contained in pressure sensing dome 36.
  • the upper part thereof is formed with a passage opening 41 sealingly connected to one end of a flexible sleeve 42, the other end end of which is connected to detergent container 9.
  • Flexible sleeve 42 is also provided with a tubular spigot 43 for connection to recirculation conduit 16, and a partition 44 separating the outlet openings of sleeve 42 and recircul­ ation conduit 16 from one another.
  • Sleeve 42 serves the purpose of conveying the washing liquid vapours escaping from collector receptacle 15 through flexible hose 14, from washing chamber 6 to the exterior of the machine through detergent container 9.
  • Partition 44 on its part serves the purpose of properly directing the washing liquid recirculated via conduit 16 into washing chamber 6, thus preventing the liquid from flowing into sleeve 42 and finally into detergent container 9, which would otherwise result in the loss of part of the detergents dissolved in the liquid.
  • Shown in fig. 3 is a modified embodiment of the electric recirculation pump 17 of the present laundry washing machine.
  • pump 17 is provided with two separate outlets 45 and 46 connected respectively to recirculation conduit 16 and to conduit 22 communicating with collector receptacle 15, so that rotation of the rotor 47 of pump 17 causes the washing liquid to be expelled through both outlets 45 and 46 and to be thus circulated via both conduits 16 and 22 as in the precedent case.
  • This construction thus likewise results in a turbulent circul­ation of the washing liquid through collector receptacle 15 for the same purposes as described above.
  • fig. 4 finally shows an electric circuit diagram of the above described components of the laundry washing machine.
  • Heater element 19 is connected in series to the associated thermostats 20 and 21, the thus formed series-connected circuit being connected in parallel to electric recircul­ation pump 17 or directly to the electric power supply through a pair of electric switches 48 and 49 adapted to be opened and closed by respective associated cams of the (not shown) program control unit of the machine.
  • Discharge pump 24 of the machine is likewise connected in parallel to the electric power supply through a further switch 50 of the program control unit.
  • any laundering programme of the present machine is executed by closing the two switches 48 and 49 of the program control unit for simultaneously energizing the series-connected circuit formed by heater element 19 and thermostats 20 and 21, and electric recirculation pump 17, while switch 50 of the program control unit is maintianed in its open state, so that discharge pump 24 is not energ­ized.
  • Fixed thermostat 21 on its part is operable to automatic­ally deenergize heater element 19 and thermostat 20 in response to the temperature exceeding its set value of preferably about 90 °C. This situation may be brought about for instance by the occurrence of a short-circuit in thermostat 20, which would otherwise result in the washing liquid being heated to its boiling point.
  • Fixed thermostat 21 thus acts as a safety device preventing the washing liquid from being heated to its boiling temper­ature with the resultant malfunctions as described earlier, namely; the entrapment of air bubbles in recirculation pump 17 with the resultant dry-running of the pump, as well as the overheating of heater element 19 within collect­or receptacle 15 which might be caused by the reasons explained above.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)
EP86115048A 1985-11-06 1986-10-29 Waschmaschine Withdrawn EP0222264A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT4574985 1985-11-06
IT45749/85A IT1187300B (it) 1985-11-06 1985-11-06 Macchina lavabiancheria

Publications (2)

Publication Number Publication Date
EP0222264A2 true EP0222264A2 (de) 1987-05-20
EP0222264A3 EP0222264A3 (de) 1988-02-24

Family

ID=11258038

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86115048A Withdrawn EP0222264A3 (de) 1985-11-06 1986-10-29 Waschmaschine

Country Status (2)

Country Link
EP (1) EP0222264A3 (de)
IT (1) IT1187300B (de)

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0404253A1 (de) * 1989-06-23 1990-12-27 OCEAN S.p.A. Waschmaschine
EP0464776A1 (de) * 1990-07-03 1992-01-08 Zanussi Elettrodomestici S.p.A. Apparat zum Messen der Wassermenge in einer Waschmaschine
WO2005118939A1 (en) * 2004-06-01 2005-12-15 Lg Electronics Inc. Drain system of drum-type washing machine
EP1666654A3 (de) * 2004-11-18 2006-06-14 Indesit Company S.p.A. Waschmaschine
EP1719831A1 (de) 2001-12-27 2006-11-08 LG Electronics Inc. Waschmaschine
KR100741549B1 (ko) * 2001-02-16 2007-07-20 삼성전자주식회사 세탁기 및 그 제어방법
CN100552120C (zh) * 2004-06-01 2009-10-21 Lg电子株式会社 滚筒式洗衣机的排水系统
US7753009B2 (en) 2006-10-19 2010-07-13 Whirlpool Corporation Washer with bio prevention cycle
US7904981B2 (en) 2006-08-15 2011-03-15 Whirlpool Corporation Water supply control for a steam generator of a fabric treatment appliance
US7913339B2 (en) 2006-08-15 2011-03-29 Whirlpool Corporation Water supply control for a steam generator of a fabric treatment appliance using a temperature sensor
KR101092427B1 (ko) * 2004-06-01 2011-12-13 엘지전자 주식회사 드럼세탁기의 배수시스템
EP2570544A1 (de) * 2011-09-15 2013-03-20 Electrolux Home Products Corporation N.V. Waschmaschine
DE19908804C5 (de) * 1999-03-01 2014-05-15 BSH Bosch und Siemens Hausgeräte GmbH Verfahren zum Betrieb einer Waschmaschine und automatisch gesteuerte Waschmaschine hierfür
EP2762632A1 (de) * 2010-11-22 2014-08-06 Electrolux Home Products Corporation N.V. Waschverfahren
EP2775025A1 (de) * 2013-03-05 2014-09-10 Vestel Beyaz Esya Sanayi Ve Ticaret A.S. Waschvorrichtung
CN107475987A (zh) * 2017-10-10 2017-12-15 无锡市南长实验中学 一种家用洗衣机
CN107794715A (zh) * 2016-08-31 2018-03-13 安徽聚隆传动科技股份有限公司 一种节水滚筒洗衣机的水循环装置
US10844533B2 (en) 2007-05-07 2020-11-24 Whirlpool Corporation Method for controlling a household washing machine
CN113605060A (zh) * 2021-08-04 2021-11-05 海信（山东）冰箱有限公司 滚筒洗衣机

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7765628B2 (en) 2006-06-09 2010-08-03 Whirlpool Corporation Steam washing machine operation method having a dual speed spin pre-wash
US7627920B2 (en) 2006-06-09 2009-12-08 Whirlpool Corporation Method of operating a washing machine using steam
US7730568B2 (en) 2006-06-09 2010-06-08 Whirlpool Corporation Removal of scale and sludge in a steam generator of a fabric treatment appliance
US7941885B2 (en) 2006-06-09 2011-05-17 Whirlpool Corporation Steam washing machine operation method having dry spin pre-wash
US7665332B2 (en) 2006-08-15 2010-02-23 Whirlpool Corporation Steam fabric treatment appliance with exhaust
US7591859B2 (en) 2006-08-15 2009-09-22 Whirlpool Corporation Water supply control for a steam generator of a fabric treatment appliance using a weight sensor
US7886392B2 (en) 2006-08-15 2011-02-15 Whirlpool Corporation Method of sanitizing a fabric load with steam in a fabric treatment appliance
US7841219B2 (en) 2006-08-15 2010-11-30 Whirlpool Corporation Fabric treating appliance utilizing steam
US7905119B2 (en) 2007-08-31 2011-03-15 Whirlpool Corporation Fabric treatment appliance with steam generator having a variable thermal output
US8555676B2 (en) 2007-08-31 2013-10-15 Whirlpool Corporation Fabric treatment appliance with steam backflow device
US7918109B2 (en) 2007-08-31 2011-04-05 Whirlpool Corporation Fabric Treatment appliance with steam generator having a variable thermal output
US7966683B2 (en) 2007-08-31 2011-06-28 Whirlpool Corporation Method for operating a steam generator in a fabric treatment appliance
US8555675B2 (en) 2007-08-31 2013-10-15 Whirlpool Corporation Fabric treatment appliance with steam backflow device
US7861343B2 (en) 2007-08-31 2011-01-04 Whirlpool Corporation Method for operating a steam generator in a fabric treatment appliance
US7690062B2 (en) 2007-08-31 2010-04-06 Whirlpool Corporation Method for cleaning a steam generator
US8037565B2 (en) 2007-08-31 2011-10-18 Whirlpool Corporation Method for detecting abnormality in a fabric treatment appliance having a steam generator

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2914935A (en) * 1957-08-16 1959-12-01 Westinghouse Electric Corp Laundry apparatus
DE1610190A1 (de) * 1967-12-07 1971-07-08 Siemens Elektrogeraete Gmbh Waschmaschine
IT1174953B (it) * 1983-12-06 1987-07-01 Zanussi A Spa Industrie Macchina lavabiancheria
DE3401899A1 (de) * 1984-01-20 1985-07-25 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Trommelwaschmaschine fuer den haushalt

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0404253A1 (de) * 1989-06-23 1990-12-27 OCEAN S.p.A. Waschmaschine
EP0464776A1 (de) * 1990-07-03 1992-01-08 Zanussi Elettrodomestici S.p.A. Apparat zum Messen der Wassermenge in einer Waschmaschine
DE19908804C5 (de) * 1999-03-01 2014-05-15 BSH Bosch und Siemens Hausgeräte GmbH Verfahren zum Betrieb einer Waschmaschine und automatisch gesteuerte Waschmaschine hierfür
KR100741549B1 (ko) * 2001-02-16 2007-07-20 삼성전자주식회사 세탁기 및 그 제어방법
EP1719831A1 (de) 2001-12-27 2006-11-08 LG Electronics Inc. Waschmaschine
US7421862B2 (en) 2001-12-27 2008-09-09 Lg Electronics Inc. Washing machine with temperature sensor arrangement
KR101092427B1 (ko) * 2004-06-01 2011-12-13 엘지전자 주식회사 드럼세탁기의 배수시스템
WO2005118939A1 (en) * 2004-06-01 2005-12-15 Lg Electronics Inc. Drain system of drum-type washing machine
CN100552120C (zh) * 2004-06-01 2009-10-21 Lg电子株式会社 滚筒式洗衣机的排水系统
US7891218B2 (en) 2004-06-01 2011-02-22 Lg Electronics Inc. Drain system of drum-type washing machine
EP1666654A3 (de) * 2004-11-18 2006-06-14 Indesit Company S.p.A. Waschmaschine
US7904981B2 (en) 2006-08-15 2011-03-15 Whirlpool Corporation Water supply control for a steam generator of a fabric treatment appliance
US7913339B2 (en) 2006-08-15 2011-03-29 Whirlpool Corporation Water supply control for a steam generator of a fabric treatment appliance using a temperature sensor
US7753009B2 (en) 2006-10-19 2010-07-13 Whirlpool Corporation Washer with bio prevention cycle
US10844533B2 (en) 2007-05-07 2020-11-24 Whirlpool Corporation Method for controlling a household washing machine
US11993886B2 (en) 2007-05-07 2024-05-28 Whirlpool Corporation Method for controlling a household washing machine
EP2762632A1 (de) * 2010-11-22 2014-08-06 Electrolux Home Products Corporation N.V. Waschverfahren
EP2570544A1 (de) * 2011-09-15 2013-03-20 Electrolux Home Products Corporation N.V. Waschmaschine
EP2775025A1 (de) * 2013-03-05 2014-09-10 Vestel Beyaz Esya Sanayi Ve Ticaret A.S. Waschvorrichtung
CN107794715A (zh) * 2016-08-31 2018-03-13 安徽聚隆传动科技股份有限公司 一种节水滚筒洗衣机的水循环装置
CN107794715B (zh) * 2016-08-31 2024-02-20 宁国聚隆减速器有限公司 一种节水滚筒洗衣机的水循环装置
CN107475987A (zh) * 2017-10-10 2017-12-15 无锡市南长实验中学 一种家用洗衣机
CN113605060A (zh) * 2021-08-04 2021-11-05 海信（山东）冰箱有限公司 滚筒洗衣机

Also Published As

Publication number Publication date
IT8545749A0 (it) 1985-11-06
IT1187300B (it) 1987-12-23
EP0222264A3 (de) 1988-02-24

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