EP2065510A1 - Maschine zum Behandeln von Wäsche, insbesondere Waschtrockner mit Rückführungskreislauf - Google Patents

Maschine zum Behandeln von Wäsche, insbesondere Waschtrockner mit Rückführungskreislauf Download PDF

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Publication number
EP2065510A1
EP2065510A1 EP07425750A EP07425750A EP2065510A1 EP 2065510 A1 EP2065510 A1 EP 2065510A1 EP 07425750 A EP07425750 A EP 07425750A EP 07425750 A EP07425750 A EP 07425750A EP 2065510 A1 EP2065510 A1 EP 2065510A1
Authority
EP
European Patent Office
Prior art keywords
washer
washing
drier machine
recirculation
washing tank
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
EP07425750A
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English (en)
French (fr)
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EP2065510B1 (de
Inventor
Silvano Fumagalli
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.)
Candy SpA
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Candy SpA
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Publication date
Application filed by Candy SpA filed Critical Candy SpA
Priority to EP07425750.2A priority Critical patent/EP2065510B1/de
Priority to PL07425750T priority patent/PL2065510T3/pl
Publication of EP2065510A1 publication Critical patent/EP2065510A1/de
Application granted granted Critical
Publication of EP2065510B1 publication Critical patent/EP2065510B1/de
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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
    • D06F58/00—Domestic laundry dryers
    • D06F58/20—General details of domestic laundry dryers 
    • D06F58/24—Condensing arrangements

Definitions

  • Domestic washer-drier machines are known to comprise a support and housing structure, a washing tank being housed therein, which is provided with a front opening that can be closed by means of a porthole door that is hinged in front of the housing.
  • a basket is pivotally housed about a horizontal or inclined axis, for the laundry to be accommodated therein to be washed and/or dried.
  • the basket also defines a front opening that is located such as to match the opening of the washing tank, in order to load/unload the laundry.
  • a washing water delivery system that can be connected to the water supply is provided in order to load the tank with mains water and detergent substances and additives.
  • This washing water delivery system comprises a plurality of electrovalves suitable to selectively adjust the supply to a plurality of flow paths extending downstream of these electrovalves through respective compartments of a detergent tray to the washing tank.
  • a drain duct is provided with a discharge pump being associated therewith, which provides for the removal of the washing liquid from the tank and controls, together with the supply electrovalves, the level of liquid within the tank.
  • An electric resistance being arranged within the tank in the gap between the tank wall and laundry basket is provided to heat the washing liquid contained in the tank.
  • the drying circuit of prior art washer-drier machines typically comprises a suction unit, a heat exchanger and a heating unit with electric resistances communicating with each other by means of a drying duct.
  • the air flow generated by the suction unit is heated by the electric resistances and blown to the basket, where it causes the water contained within the tissues to evaporate as it passes through the wet laundry.
  • the heat exchanger which is generally a container separate from the washing tank and provided with a spray nozzle, the wet air is cooled by a jet of cold water. Due to this cooling, the vapour condensates and is collected and discharged together with the cooling water. The dehumidified air is then sucked again by the suction unit and recirculated.
  • the cooling water is usually supplied to the heat exchanger by means of a cooling duct with a dedicated electrovalve which controls the loading of the mains water to the heat exchanger (condenser).
  • the volume of the liquid accommodated within the discharge duct and on the tank bottom is destined to be completely unused and is just discharged in the wastewater network.
  • the washer-drier machine comprises:
  • a discharge circuit with a discharge duct and a discharge pump which is at least partially arranged underneath the bottom of the washing tank and in fluid communication with said tank bottom, such as to be capable of discharging the liquid contained within the washing tank,
  • said discharge circuit defines a space which, in the operating condition of the washer-drier machine, contains an additional liquid volume being arranged below the laundry basket,
  • a recirculation circuit with a recirculation duct and pump means which is connected to said washing tank and said discharge circuit in a location below the tank bottom, such as to be capable of conveying at least one part of the additional volume into the washing tank.
  • the recirculation circuit is connected to the washing tank in a location above the level as defined by the lower side of the basket, and preferably, above the predetermined liquid level for the washing steps.
  • the recirculation circuit is connected to the condenser of the drying circuit, such as to supply, during the drying step, said condenser with cooling liquid that is taken from said additional liquid volume.
  • the condenser can be, in turn, connected to the washing tank, such as to obtain, during the washing operation, the admixing of the washing water, and during the drying step, the cooling liquid together with the condensate are collected on the tank bottom and underlying discharge circuit, from where they can be discharged or conveyed (recirculated) again to the condenser.
  • the washing tank defines therein a condensation space suitable to contain a cooling water volume that forms a free water surface spaced away from the basket such as to be capable of cooling the drying air flow downstream of the basket within the washing tank.
  • This cooling free water surface can be either added to a "traditional" condenser or entirely replace the latter.
  • the cooling water volume within the tank and discharge circuit which exactly corresponds to the additional water volume, has a thermal gradient given by the difference between the temperature of the hot laundry within the basket and that of the cooler external environment. Due to said recirculation circuit, the further synergic effect is obtained, which, during the drying step, the cooler portion of the cooling water volume is recirculated and mixed with the warmer portion directly involved in the condensation process.
  • FIG. 1 is a side sectional view of a washer-drier machine according to an embodiment of the invention
  • FIG. 2 is a front sectional view of the washer-drier machine in Fig. 1 ;
  • FIG. 3 is a side sectional view of a washer-drier machine according to a further embodiment of the invention.
  • Fig. 4 is a front sectional view of the washer-drier machine in Fig. 3 ;
  • Fig. 5 illustrates a diagram of a filtering system of the washer-drier machine according to an embodiment of the invention
  • FIG. 6 illustrates a diagram of a filtering system of the washer-drier machine according to an embodiment of the invention.
  • a washer-drier machine 1 comprises a support and housing structure 2, a washing tank 3 being housed therein, which is provided with a front opening that can be closed by means of a porthole door 4 being hinged to the front of the housing 2.
  • a basket 5 is pivotally housed about a horizontal or inclined axis, for the laundry to be accommodated therein to be washed and/or dried.
  • the basket 5 also defines a front opening that is located such as to match the opening of the washing tank 3, in order to be capable of carrying out the loading/unloading of the laundry.
  • the washing tank 3 is suitable to contain the washing liquid during the laundry washing steps, and to be a portion of the drying circuit during the laundry drying step.
  • a washing water delivery system that can be connected to the water supply is provided in order to load the tank 3 with mains water and detergent substances and additives.
  • This washing water delivery system comprises a plurality of washing flow paths extending from, for example, two supply electrovalves (not illustrated) through corresponding compartments 6 of a detergent tray 7 to the washing tank 3.
  • a drain duct 9 On the bottom 8 of the washing tank 3, there is connected a drain duct 9, with a discharge pump 10 associated therewith and being arranged underneath the tank bottom 8, which provides for the removal of the washing liquid from the tank 3 and controls, together with the supply electrovalves, the level of liquid within the tank 3.
  • a coiled electric resistance is provided, which is arranged within the tank 3, particularly on the bottom 8 of the latter, in the gap between the tank wall 3 and the laundry basket 5.
  • the washer-drier machine 1 further comprises a closed-loop drying circuit with a suction unit, for example an fan impeller 11 driven by an electric motor 12, a heat exchanger as well as a heating unit with electric resistance 13, which communicate with each other by means of a drying circuit 14.
  • a suction unit for example an fan impeller 11 driven by an electric motor 12, a heat exchanger as well as a heating unit with electric resistance 13, which communicate with each other by means of a drying circuit 14.
  • the air flow 15 generated by the suction unit 11, 12 is heated by the electric resistance 13 and blown to the basket 5, where it causes the water contained within the tissues to evaporate as it passes through the wet laundry.
  • the heat exchanger is arranged downstream of the laundry basket 5 (with reference to the direction of the drying air flow 15) and cools the wet air flowing from the basket 5.
  • vapour condensates and is collected and discharged, for example together with a cooling water volume.
  • the dehumidified air is then sucked again by the suction unit 11,12 and recirculated.
  • the discharge circuit (discharge duct 9 and discharge pump 10) defines, along with the tank bottom 8, a space that, in the operating condition of the washer-drier machine 1, contains an additional liquid volume 16 that is arranged below the laundry basket 5.
  • a recirculation circuit with a recirculation duct 17 and pump means for example a recirculation pump 18 is connected to the washing tank 3 and with said discharge circuit 9, 10 in a point below the tank bottom 8, such as to be capable of at least partially conveying the additional liquid volume 16 to the washing tank 3.
  • the recirculation circuit is connected to the discharge circuit in the vicinity of the discharge pump 10 or directly thereto, which pump is usually arranged in the lowermost point of the whole discharge circuit.
  • the recirculation pump 18 is connected to the discharge pump 10 (by means of the piping of the discharge and recirculation ducts or by dedicated connection members) such that the recirculation pump is structurally supported by the discharge pump, and thus does not require further support means.
  • the recirculation pump 18 is connected (by means of the piping of the discharge circuit or by means of suitable connection members) to the washing tank 3, preferably to the tank bottom 8, whereas the connection point between the discharge circuit and the recirculation circuit can be either in the vicinity of the tank bottom or even much spaced from the latter.
  • a mechanical connection of the recirculation pump to the tank bottom 8 allows using the same support and shock-absorbing components as the tank-basket unit for supporting the recirculation pump 18.
  • the washing tank 3 defines a condensation space 19 therein, which is suitable to contain a cooling water volume 20 that forms a free water surface spaced away from the basket 5 such as to be capable of cooling the drying air flow 22 downstream of the basket 5 within the washing tank 3.
  • this condensation space 19 is formed at the tank bottom 8, approximatively below the basket 5.
  • the whole supply circuit of the condenser can be eliminated, as the latter can be easily supplied with mains water loaded by the washing water loading circuit, since it consists of a free surface of a water volume 20 (condensation surface) within the washing tank 3.
  • the cooling liquid due to the inevitable filling of the discharge circuit 9, 10 with cooling liquid, the cooling liquid also has said additional liquid volume 16 with a thermal gradient that is determined by the difference between the highest temperature of the condensation surface that is exposed to the hot air flow 15 and the lowest temperature of the farthermost areas from the basket 5.
  • the coldest portion of the cooling water volume is fed back into the washing tank 3, and then admixed with the warmest cooling water portion that is directly involved in the condensation process.
  • the washer-drier machine 1 comprises a control unit (not shown in the drawings) which allows setting a drying program that carries out the following steps:
  • the step of controlling the cooling water level 20 comprises the step of detecting a value indicative of the cooling water level 20 and at least partially draining the cooling water 20 through the drain duct 9, when the cooling water level 20 exceeds said upper level.
  • the operation of detecting a value indicative of the cooling water level 20 is carried out by means of a pressure sensor 22 that is arranged at the tank bottom 8.
  • This pressure sensor 22 e.g., a so-called pressure switch
  • the control unit controls the discharge pump 10 and causes the latter to at least partially drain the cooling water 20 and condensate from the washing tank 3.
  • the pressure sensor 22 directly interacts with the power supply of the discharge pump 10 and causes the partial or total drainage of the tank 3 in response to the attainment of a determined water level, for example the above-cited upper level.
  • control of the cooling water level 20 can be carried out with one or more level sensors (such as a sensor using the electrical conductivity of the cooling water 20) that are connected to the control unit and/or directly to the discharge pump 10.
  • level sensors such as a sensor using the electrical conductivity of the cooling water 20
  • the washer-drier machine and the washing and drying programs thereof are configured such that the control of the cooling water level 20 during the drying step and the control of the washing liquid level during the washing and rinse steps are carried out by means of a same pressure sensor 22 or group of level sensors.
  • control of the cooling water level 20 can be carried out by at least partially draining this water, at preset time intervals, wherein the duration of these intervals is determined, for example, on the basis of a series of tests or numerical simulations and takes into account the condensate accumulation on the tank bottom.
  • the process step of controlling the temperature of cooling water 20 comprises the step of detecting the temperature or a entity indicative of the temperature of the cooling water 20 and at least partially discharging the cooling water 20 through the drain duct 9 and feeding a corresponding amount of fresh mains water in the washing tank 3, when the temperature detected exceeds said upper value.
  • the operation of detecting the temperature of the cooling water 20 is carried out by means of a temperature sensor 23 arranged in the vicinity of the tank bottom 8.
  • This temperature sensor 23 generates a temperature signal and sends it to the control unit, which, in turn controls the drain pump 10 and the supply electrovalves.
  • the control unit When the upper temperature is reached or exceeded, the control unit causes the drain pump 10 to at least partially remove the cooling water 20 and condensate from the washing tank 3 and, subsequently, it opens the supply electrovalve to feed a corresponding amount of cold mains water, preferably through the same water supply duct used during the washing step.
  • the temperature sensor 23 directly interacts with the power supply of the discharge pump 10 and supply electrovalves and causes the partial or total replacement of the cooling water 3 in response to the fact that the upper temperature has been either attained or exceeded.
  • the washer-drier machine and the washing and drying programs are configured such that the control of the temperature of the cooling water 20 during the drying step and the control of the temperature of the washing liquid during the washing and rinse steps are carried out by means of a same temperature sensor 23 or groups of temperature sensors.
  • control of the temperature of the cooling water 20 can be carried out by at least partially replacing this water, at preset time intervals, wherein the duration of these intervals is determined, for example, on the basis of a series of tests or numerical simulations and takes into account the temperature increase in the mixture of cooling water and condensate on the tank bottom 8.
  • the control unit of the washer-drier machine 1 or a local control unit of the recirculation pump 18 controls the electric power supply of the recirculation pump 18 such as to carry out the recirculation of the additional liquid volume 16 and the admixture of the latter with:
  • control unit controls the loading of mains water, the drainage of cooling liquid and condensate and the recirculation of the additional liquid volume, such as to avoid exceeding a determined maximum water level within the tank, said maximum level being lower than the lower side of the basket 5, and to recirculate an amount of water that, when the recirculation pump is deactivated, would increase the water level in the tank beyond said maximum level and beyond the lower side of the basket 5.
  • the washing tank 3 which is preferably moulded from plastics, defines therein a suction portion 24 of the drying duct 14, i.e. the duct portion arranged downstream of the heat exchanger (consisting of the free surface 21 of the cooling water 20 on the tank bottom 8) and upstream of the suction unit 11, 12.
  • this suction duct 24 extends within the washing tank 3 from a lower area thereof to an opening 25 in the upper area thereof and is defined by a portion of the inner surface of the tank 3 and by a lid 26 that is separately manufactured and subsequently connected to the inner surface of the washing tank 3.
  • washing tank 3 can be advantageously used both with washing machines without drying function (without the inner lid 26), and with drier-washer machines (with the inner lid 26).
  • the washer-drier machine 1 comprises, in addition to the heat exchanger consisting of the cooling water volume 20 on the tank bottom 8, a further heat exchanger 27, which is preferably arranged downstream of the first heat exchanger 19, 20 (with reference to the flow direction of the drying air 15) and provided with a cooling device, such as a spraying nozzle 28 or cooling coil (not shown) that can be supplied by means of the recirculation circuit 17, 18 with cooling liquid being taken from the discharge circuit 9, 10.
  • a cooling device such as a spraying nozzle 28 or cooling coil (not shown) that can be supplied by means of the recirculation circuit 17, 18 with cooling liquid being taken from the discharge circuit 9, 10.
  • the further heat exchanger 27 is connected to the washing tank 3, such that, during the washing operation, the admixture of the washing water is obtained, and during the drying step (and also considering possible embodiments without condenser with free water surface 19, 20, 21), the cooling liquid together with the condensate, are collected on the tank bottom 8 and in the discharge circuit 9, 10 therebelow, from where they can be either discharged or conveyed again (recirculated) to the heat exchanger 27.
  • the recirculation duct 17 is connected to the washing tank in a point above the level being defined by the lower side of the basket 5, and preferably, above the predetermined liquid level for the washing steps.
  • the lower suction opening 29 of the suction portion 24 is arranged below a level of rinse liquid 30 during a rinse step, and preferably, this suction opening 29 is arranged at or below a washing liquid level 31 during a washing step. This configuration facilitates the cleaning of the suction duct during the washing and rinse operations.
  • the washer-drier machine comprises a particulate filter 32 arranged upstream of the discharge pump 10 and suitable to hold the sediments and limestone that are contained in the liquid that is intended to be discharged, in order to avoid damaging and jamming the rotor of the discharge pump 10.
  • the recirculation pump 18 can be arranged downstream of the particulate filter 32 and upstream of the discharge pump 10 (with reference to the direction of the discharge flow), such that the same particulate filter 32 holds the particulate both during the recirculation and during the discharge of the liquid, thereby consequently protecting both pumps ( Fig. 5 ).
  • the particulate filter 32 is configured such as to divide the discharge duct 9 into branches upstream of the discharge pump 10 and recirculation pump 18, and comprises a first particulate catching device 33 that is arranged in the inlet flow of the discharge pump 9 and a second particulate catching device 34 (distinct from the first particulate catching device 33) and arranged in the inlet flow of the recirculation pump 18. This allows designing both particulate catching devices 33, 34 in a targeted manner for each one of the discharge and recirculation pumps ( Fig.6 ).
  • both particulate catching devices 33, 34 are associated with a same single particulate collection chamber 35. This allows, on the one side, a targeted filtering and differentiated according to the discharge and recirculation functions, and on the other hand, emptying only one container when cleaning the filter.
  • the recirculation circuit 17, 18 is advantageous both for washer-drier machines (since the synergic effect is obtained of best using the thermal characteristics and the laundry treatment substances during the washing and drying steps) and for washing machines (in which the recirculation allows a better use of the thermal energy of the washing liquid and substances dissolved therein).
  • the machine for treating the laundry according to the invention particularly in the embodiment of washer-drier machine has a number of advantages.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)
EP07425750.2A 2007-11-28 2007-11-28 Maschine zum Behandeln von Wäsche, insbesondere Waschtrockner mit Rückführungskreislauf Active EP2065510B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP07425750.2A EP2065510B1 (de) 2007-11-28 2007-11-28 Maschine zum Behandeln von Wäsche, insbesondere Waschtrockner mit Rückführungskreislauf
PL07425750T PL2065510T3 (pl) 2007-11-28 2007-11-28 Maszyna do obchodzenia się z praniem, zwłaszcza pralko-suszarka z obwodem recyrkulacyjnym

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP07425750.2A EP2065510B1 (de) 2007-11-28 2007-11-28 Maschine zum Behandeln von Wäsche, insbesondere Waschtrockner mit Rückführungskreislauf

Publications (2)

Publication Number Publication Date
EP2065510A1 true EP2065510A1 (de) 2009-06-03
EP2065510B1 EP2065510B1 (de) 2014-05-07

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EP07425750.2A Active EP2065510B1 (de) 2007-11-28 2007-11-28 Maschine zum Behandeln von Wäsche, insbesondere Waschtrockner mit Rückführungskreislauf

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EP (1) EP2065510B1 (de)
PL (1) PL2065510T3 (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2366828A1 (de) * 2010-03-17 2011-09-21 Candy S.p.A. Wäschetrocknermaschine mit verbessertem Kondensatorkühlungssystem
EP2749683A1 (de) * 2012-12-27 2014-07-02 Dongbu Daewoo Electronics Corporation Trocknungsvorrichtung und Verfahren zum Trocknen von Wäsche
WO2017043865A1 (ko) * 2015-09-08 2017-03-16 엘지전자 주식회사 로터 및 이를 포함하는 모터
CN107988771A (zh) * 2016-10-26 2018-05-04 博西华电器（江苏）有限公司 衣物烘干装置
EP3375930A3 (de) * 2017-02-21 2018-11-14 Miele & Cie. KG Verfahren zum trocknen von wäsche, steuerverfahren und steuervorrichtung zum steuern eines trocknungsvorgangs und waschtrockner
EP3375929A3 (de) * 2017-02-21 2018-11-14 Miele & Cie. KG Verfahren zum trocknen von wäsche, steuerverfahren und steuervorrichtung zum steuern eines trocknungsvorgangs und wasserführendes haushaltgerät zur wäschebehandlung

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1473403A1 (de) * 2003-04-30 2004-11-03 Samsung Electronics Co., Ltd. Waschmaschine
EP1657341A2 (de) * 2004-11-12 2006-05-17 LG Electronics Inc. Verfahren und Vorrichtung zur Kontrolle der Trocknung in einer maschine zum Waschen und Trocknen
EP1688524A1 (de) * 2005-02-03 2006-08-09 Lg Electronics Inc. Waschmaschine und/oder Trockner mit einer Kondensationseinrichtung

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1473403A1 (de) * 2003-04-30 2004-11-03 Samsung Electronics Co., Ltd. Waschmaschine
EP1657341A2 (de) * 2004-11-12 2006-05-17 LG Electronics Inc. Verfahren und Vorrichtung zur Kontrolle der Trocknung in einer maschine zum Waschen und Trocknen
EP1688524A1 (de) * 2005-02-03 2006-08-09 Lg Electronics Inc. Waschmaschine und/oder Trockner mit einer Kondensationseinrichtung

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2366828A1 (de) * 2010-03-17 2011-09-21 Candy S.p.A. Wäschetrocknermaschine mit verbessertem Kondensatorkühlungssystem
EP2749683A1 (de) * 2012-12-27 2014-07-02 Dongbu Daewoo Electronics Corporation Trocknungsvorrichtung und Verfahren zum Trocknen von Wäsche
WO2017043865A1 (ko) * 2015-09-08 2017-03-16 엘지전자 주식회사 로터 및 이를 포함하는 모터
US10326325B2 (en) 2015-09-08 2019-06-18 Lg Electronics Inc. Rotor and motor including the same
CN107988771A (zh) * 2016-10-26 2018-05-04 博西华电器（江苏）有限公司 衣物烘干装置
EP3375930A3 (de) * 2017-02-21 2018-11-14 Miele & Cie. KG Verfahren zum trocknen von wäsche, steuerverfahren und steuervorrichtung zum steuern eines trocknungsvorgangs und waschtrockner
EP3375929A3 (de) * 2017-02-21 2018-11-14 Miele & Cie. KG Verfahren zum trocknen von wäsche, steuerverfahren und steuervorrichtung zum steuern eines trocknungsvorgangs und wasserführendes haushaltgerät zur wäschebehandlung

Also Published As

Publication number Publication date
EP2065510B1 (de) 2014-05-07
PL2065510T3 (pl) 2015-04-30

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