EP0503586A1 - Verbesserung in Wäschetrocknern - Google Patents

Verbesserung in Wäschetrocknern Download PDF

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Publication number
EP0503586A1
EP0503586A1 EP92104162A EP92104162A EP0503586A1 EP 0503586 A1 EP0503586 A1 EP 0503586A1 EP 92104162 A EP92104162 A EP 92104162A EP 92104162 A EP92104162 A EP 92104162A EP 0503586 A1 EP0503586 A1 EP 0503586A1
Authority
EP
European Patent Office
Prior art keywords
air
clothes drying
drum
drying machine
clothes
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Withdrawn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
EP92104162A
Other languages
English (en)
French (fr)
Inventor
Ermanno Zaina
Piero Durazzani
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 Elettrodomestici SpA
Original Assignee
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 Zanussi Elettrodomestici SpA filed Critical Zanussi Elettrodomestici SpA
Publication of EP0503586A1 publication Critical patent/EP0503586A1/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Withdrawn legal-status Critical Current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
    • D06F58/00—Domestic laundry dryers
    • D06F58/20—General details of domestic laundry dryers 
    • 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
    • D06F2103/02—Characteristics of laundry or load
    • D06F2103/08—Humidity
    • 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
    • D06F2103/28—Air properties
    • D06F2103/32—Temperature
    • 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
    • D06F2103/28—Air properties
    • D06F2103/34—Humidity
    • 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
    • D06F2103/28—Air properties
    • D06F2103/36—Flow or velocity
    • 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
    • D06F2105/16—Air properties
    • D06F2105/24—Flow or velocity
    • 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
    • D06F2105/32—Air flow control means
    • 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
    • D06F58/02—Domestic laundry dryers having dryer drums rotating about a horizontal axis
    • 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
    • D06F58/32—Control of operations performed in domestic laundry dryers 
    • D06F58/34—Control of operations performed in domestic laundry dryers  characterised by the purpose or target of the control
    • D06F58/36—Control of operational steps, e.g. for optimisation or improvement of operational steps depending on the condition of the laundry
    • D06F58/38—Control of operational steps, e.g. for optimisation or improvement of operational steps depending on the condition of the laundry of drying, e.g. to achieve the target humidity

Definitions

  • the present invention relates to a clothes drying machine provided with a rotating drum which contains the washload to be dried and in which a continuous flow of hot air is blown to remove the moisture from the washload.
  • clothes drying machines may be provided with sensing means that are capable of measuring the conductivity of the clothes to be dried and, as a consequence, the degree of residual moisture in the same clothes, said sensing means are connected in the electrical circuit of the drying machine, together with the drum driving motor, the fan motor and at least a heating element to heat up the drying air.
  • Said sensing means which may be given different shapes and sizes, are arranged in the drum so as to ensure that they will be in contact with the clothes throughout the drying process and will generate an output of electric signals corresponding to the varying moisture degree of the clothes during the drying process.
  • Clothes drying machines of the type described in the US-A-3335501 are further provided with a moisture control device which may for instance consist of a traditional-type electronic comparator circuit connected with both said sensing means and the electrical circuit of the clothes drying machine.
  • a moisture control device which may for instance consist of a traditional-type electronic comparator circuit connected with both said sensing means and the electrical circuit of the clothes drying machine.
  • control arrangements and devices which may be used to determine the degree of moisture and the state of drying of a washload or, anyway, to ensure the performance of a correct drying cycle.
  • control arrangements or devices are adapted to perform a comparison of the electrical output signals generated by the sensing means with predetermined reference electrical signals corresponding to definite conditions under which the clothes may be assumed to be effectively and adequately dried.
  • control arrangement Upon reaching such a condition, the control arrangement trips so as to switch off said heating elements and said motor, thereby causing the clothes drying cycle to be terminated under possible extension of the process with a further period of drum rotation or ventilation under no-heat conditions as an anti-crease measure.
  • control arrangements may in the same way be adapted to stop clothes drying at any time during an on-going process, based on the signals corning from temperature control thermostats, in the case of any fortuitous failure or irregular operating condition of the machine which is likely to bring about an over-heating of the clothes and, as a consequence, to cause the same clothes to be damaged.
  • a clothes drying machine comprising a rotating drum adapted to contain the damp clothes to be dried, said drum being crossed by the flow of drying air that is heated up by at least a heating element, and various types of control means adapted to cause said heating element to be switched on and off appropriately.
  • the clothes drying machine being considered is characterized in that the heat contained in the exhaust air is partly recovered according to various methods, which will be described hereinafter, so as to be used to pre-heat fresh air taken in from the outside.
  • a second heat recovery methods may consists in using the same clothes containing drum as a heat-exchanger means to pre-heat the fresh air taken in from the outside.
  • the clothes drying machine consists of an outer casing 3 enclosing a rotating drum 4, which is adapted to contain the damp clothes to be dried and is rotatably driven by means of a drive motor of a per sè known type (not shown).
  • the rear flange 7 of the rotating drum 4 is provided with throughout openings 9 communicating with an air inlet opening 31 provided in the back wall of said casing 3.
  • a conduit 10 is arranged to communicate on one of its sides with the access opening 11, which is provided in the front flange 6 of the rotating drum 4, and on its other side with an air exhaust opening 32, which is provided on the rear side of the machine and is partially coinciding with said air intake opening 31 depending on the pre-selected control inputs as described hereinafter.
  • a lint filter 12, a fan 13 driven by a motor which is not shown, and at least a heating element 15 of a traditional type are arranged in the conduit 10.
  • the drying air taken in from outside by the fan 13 through the external opening 31 is heated up by said heating element 15, and it is then blown through the damp clothes being tumbled in the drum, so that the same clothes are gradually dried under removal of their moisture contents by said hot air, which is ultimately exhausted outside the drying machine through the appropriate opening 32.
  • control arrangement 30 trips to cause the heating element 15 and the respective drive motors of the drum 4 and the fan 13 to automatically switch off in a per sè known manner, so that the drying process itself is terminated.
  • the considered control arrangement is capable to stop, in the same manner, the clothes drying process at any moment during an on-going cycle upon occurrence of any failure or irregular operating condition of the drying machine that may bring about an over-heating of the clothes to be dried and, as a consequence, cause them to suffer damages.
  • such a control and monitoring arrangement 30 can further control two thermostats 33 and 34 which are respectively situated at the inlet 9 of the hot air into the drum and at the outlet 6 of the same air before it is reconveyed into the exhaust conduit 10.
  • control and monitoring arrangement 30 can therefore appropriately trip to de-energize heating of the recirculating air, while allowing the air circulation fan to keep operating.
  • a useful improvement according to the present invention consists in letting the fan operate normally with the heating element 15 operating at either full or partial power input, while blowing inside the drum an air mixture made up partly by the hot exhaust air, as appropriately intercepted and recovered, and partly by fresh air sucked in from the outside of the machine.
  • the recovery of said hot exhaust air and the subsequent mixture with the fresh air flow can be accomplished by means of an arrangement 8 as illustrated in Figures 2 and 3, said arrangement being controlled by the control element 30 to which also the signals from the two thermostats 33 and 34 are sent.
  • the machine therefore operates as follows: upon starting the drying cycle by the user, the two thermostats 33 and 34 start signalling the temperatures to said control element 30.
  • control element 30 When the difference between the values of the two temperatures being signalled by said thermostats decreases under a certain limit, or when the temperature of the exhaust air raises above a certain limit, or more simply after a certain pre-determined period of time (said control element 30 may be adapted to accomodate all these and further equivalent control options according to the state of the art), then said control element 30 trips to send an appropriate control signal to an actuator means (not shown) commanding the flow diverter 8 for starting air mixing.
  • said flow diverter 8 intercepts a part of the hot air flow coming from the conduit 10 as well as the flow of fresh air sucked in from the outside of the machine through the opening 31, and conveys the resulting mixed flow again toward the heating element 15 so as to go on with and keep up the drying cycle.
  • the characteristics of the mixed air obtained in the afore described way may of course be varied according to the setting of the flow diverter 8, which may be adjusted into different postures. It is in this way possible to achieve and perform appropriately differentiated drying cycles under accordingly more or less reduced energy consumption rates.
  • control of said variability in the air mixing proportions is of course ensured by said control element 30, preferably on the basis of the moisture contents of the air vented from the drum.
  • a further method for recovering the heat exhausted from a clothes drying machine is according the embodiment illustrated in Figure 4, which shows a clothes drying machine comprising a drum 4, a fresh air suction port 31, an outlet 32 for venting the hot and damp air through the conduit 10, a fan 13 for the forced circulation of the air.
  • the main feature of a clothes drying machine of the above cited type lies in that the air taken in through the suction port 31, instead of being directly blown to heat up over traditional-type heating elements and then conveyed into the drum of the machine, is directly sent into the hollow space 41 provided between the outer casing 3 of the machine and the drum 4.
  • the air is caused to flow in contact with the outer surface of the drum 4 which, owing to the fact that it is made of metal material and has therefore a very good thermal conductivity, as well as that it has a very large outer surface at a temperature which is very close to the average temperature prevailing inside the drum, turns out to act as a heat source which is very easy and simple to carry out and, above all, is very economical and reliable.
  • a further improvement of the above described heat-exchange process is achieved by conveying the fresh air being taken in from the outside of the machine into an appropriately provided heat-exchanger arrangement 40 which is provided in a very close connection with the outer surface of the drum in such a way as to wrap the largest possible area of the same outer surface of the drum, said air being constrained to circulate within the boundaries of said heat-exchanger arrangement without getting scattered over the entire volume of said hollow space 44.
  • the fresh air is then sucked in through a port 42 and, through a conduit 43, is conveyed to a traditional-type heating element arrangement 15 and finally into the drum and through the clothes contained therein, according to the usual construction.
  • the heat subtracted and recovered according to the present invention is actually subtracted from the heat of the air inside the drum, at least a part of which is normally sent directly toward the vent conduit 10 and cannot therefore be used any further to perform a clothes drying action. And it is actually this exhaust heat that is basically recovered and re-used.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)
  • Drying Of Solid Materials (AREA)
EP92104162A 1991-03-12 1992-03-11 Verbesserung in Wäschetrocknern Withdrawn EP0503586A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITPN910016A IT1250380B (it) 1991-03-12 1991-03-12 Macchina asciugabiancheria di tipo perfezionato
ITPN910016 1991-03-12

Publications (1)

Publication Number Publication Date
EP0503586A1 true EP0503586A1 (de) 1992-09-16

Family

ID=11394506

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92104162A Withdrawn EP0503586A1 (de) 1991-03-12 1992-03-11 Verbesserung in Wäschetrocknern

Country Status (2)

Country Link
EP (1) EP0503586A1 (de)
IT (1) IT1250380B (de)

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998027258A1 (en) * 1996-12-18 1998-06-25 Eco Air Limited Tumble drier with a single fan to suck hot humid air
EP1123999A2 (de) * 2000-02-08 2001-08-16 Alliance Laundry Systems LLC Wäschetrockner mit einem , zum Begrenzen der Temperatur, Luftdurchfluss
KR20030041385A (ko) * 2001-11-20 2003-05-27 (주)이젠텍 의류건조기
EP1559829A1 (de) * 2004-01-28 2005-08-03 CANDY S.p.A. Trockungsverfahren und Wäschetrockner
WO2009080431A1 (de) * 2007-12-21 2009-07-02 BSH Bosch und Siemens Hausgeräte GmbH Hausgerät zur pflege von wäschestücken und verfahren zum betreiben eines derartigen hausgeräts
WO2009130129A1 (de) * 2008-04-24 2009-10-29 BSH Bosch und Siemens Hausgeräte GmbH Ablufttrockner mit verminderter kondensatbildung sowie verfahren zu seinem betrieb
EP2157229A1 (de) * 2008-08-22 2010-02-24 BSH Bosch und Siemens Hausgeräte GmbH Satz mit einem ersten und einem zweiten Trockner
EP2410087A1 (de) * 2010-07-16 2012-01-25 Panasonic Corporation Schaltmechanismus zum Schalten eines Blasewegs, Wäschetrockner
US8276292B2 (en) * 2006-04-26 2012-10-02 Herbert Kannegiesser Gmbh Method for recovering heat energy released by laundry machines
CN103097601A (zh) * 2011-09-02 2013-05-08 松下电器产业株式会社 衣物干燥机和洗涤干燥机
EP2657395A1 (de) * 2012-04-26 2013-10-30 Herbert Kannegiesser GmbH Verfahren zum Trocknen von Wäschestücken
EP2699723A2 (de) * 2011-04-18 2014-02-26 LG Electronics Inc. Waschmaschine
CN107726495A (zh) * 2017-09-19 2018-02-23 青岛海尔空调器有限总公司 室内机
WO2019206383A1 (de) * 2018-04-27 2019-10-31 Lavatec Laundry Technology Gmbh Trockner und verfahren zum betrieb eines trockners
DE102007042969B4 (de) * 2007-09-10 2021-05-27 BSH Hausgeräte GmbH Trockner mit Wärmerückgewinnung und Umluftanteil
DE102020101597A1 (de) 2020-01-23 2021-07-29 Miele & Cie. Kg Wäschetrockner

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2511761A3 (fr) * 1981-08-24 1983-02-25 Schonmann Wilfred Appareil a air chaud pour installations de sechage
FR2517040A1 (fr) * 1981-11-20 1983-05-27 Setan Etudes Analyses Dispositif permettant le recyclage partiel de l'air utilise dans un sechoir industriel
EP0038561B1 (de) * 1980-04-22 1984-09-26 Ranco Incorporated Wäschetrommeltrockner
US4549362A (en) * 1982-01-19 1985-10-29 Haried John C Programmable air recirculator/mixer for a fabric dryer
EP0163265A2 (de) * 1984-05-26 1985-12-04 Miele & Cie. GmbH & Co. Trommeltrockner für Wäsche

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0038561B1 (de) * 1980-04-22 1984-09-26 Ranco Incorporated Wäschetrommeltrockner
FR2511761A3 (fr) * 1981-08-24 1983-02-25 Schonmann Wilfred Appareil a air chaud pour installations de sechage
FR2517040A1 (fr) * 1981-11-20 1983-05-27 Setan Etudes Analyses Dispositif permettant le recyclage partiel de l'air utilise dans un sechoir industriel
US4549362A (en) * 1982-01-19 1985-10-29 Haried John C Programmable air recirculator/mixer for a fabric dryer
EP0163265A2 (de) * 1984-05-26 1985-12-04 Miele & Cie. GmbH & Co. Trommeltrockner für Wäsche

Cited By (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998027258A1 (en) * 1996-12-18 1998-06-25 Eco Air Limited Tumble drier with a single fan to suck hot humid air
EP1123999A2 (de) * 2000-02-08 2001-08-16 Alliance Laundry Systems LLC Wäschetrockner mit einem , zum Begrenzen der Temperatur, Luftdurchfluss
EP1123999A3 (de) * 2000-02-08 2001-09-12 Alliance Laundry Systems LLC Wäschetrockner mit einem , zum Begrenzen der Temperatur, Luftdurchfluss
KR20030041385A (ko) * 2001-11-20 2003-05-27 (주)이젠텍 의류건조기
EP1559829A1 (de) * 2004-01-28 2005-08-03 CANDY S.p.A. Trockungsverfahren und Wäschetrockner
US8276292B2 (en) * 2006-04-26 2012-10-02 Herbert Kannegiesser Gmbh Method for recovering heat energy released by laundry machines
DE102007042969B4 (de) * 2007-09-10 2021-05-27 BSH Hausgeräte GmbH Trockner mit Wärmerückgewinnung und Umluftanteil
WO2009080431A1 (de) * 2007-12-21 2009-07-02 BSH Bosch und Siemens Hausgeräte GmbH Hausgerät zur pflege von wäschestücken und verfahren zum betreiben eines derartigen hausgeräts
WO2009130129A1 (de) * 2008-04-24 2009-10-29 BSH Bosch und Siemens Hausgeräte GmbH Ablufttrockner mit verminderter kondensatbildung sowie verfahren zu seinem betrieb
CN102016158B (zh) * 2008-04-24 2012-09-12 Bsh博世和西门子家用器具有限公司 冷凝形成物减少的通气式干衣机及其操作方法
EP2157230A1 (de) * 2008-08-22 2010-02-24 BSH Bosch und Siemens Hausgeräte GmbH Satz mit einem ersten und einem zweiten Trockner
EP2157229A1 (de) * 2008-08-22 2010-02-24 BSH Bosch und Siemens Hausgeräte GmbH Satz mit einem ersten und einem zweiten Trockner
EP2410087A1 (de) * 2010-07-16 2012-01-25 Panasonic Corporation Schaltmechanismus zum Schalten eines Blasewegs, Wäschetrockner
CN102337657A (zh) * 2010-07-16 2012-02-01 松下电器产业株式会社 切换送风路径的切换机构、衣物干燥机及洗涤干燥机
US9617674B2 (en) 2011-04-18 2017-04-11 Lg Electronics Inc. Washing machine
CN103952893A (zh) * 2011-04-18 2014-07-30 Lg电子株式会社 洗衣机
EP2699723A4 (de) * 2011-04-18 2015-04-22 Lg Electronics Inc Waschmaschine
EP2716808A3 (de) * 2011-04-18 2015-04-22 LG Electronics Inc. Waschmaschine
EP2711456A3 (de) * 2011-04-18 2015-04-22 LG Electronics, Inc. Waschmaschine mit Trocknerfunktion
EP2699723A2 (de) * 2011-04-18 2014-02-26 LG Electronics Inc. Waschmaschine
US9624614B2 (en) 2011-04-18 2017-04-18 Lg Electronics Inc. Washing machine
US9702073B2 (en) 2011-04-18 2017-07-11 Lg Electronics Inc. Washing machine
CN103097601A (zh) * 2011-09-02 2013-05-08 松下电器产业株式会社 衣物干燥机和洗涤干燥机
CN103097601B (zh) * 2011-09-02 2015-11-25 松下电器产业株式会社 衣物干燥机和洗涤干燥机
EP2657395A1 (de) * 2012-04-26 2013-10-30 Herbert Kannegiesser GmbH Verfahren zum Trocknen von Wäschestücken
CN107726495B (zh) * 2017-09-19 2019-10-01 青岛海尔空调器有限总公司 室内机
CN107726495A (zh) * 2017-09-19 2018-02-23 青岛海尔空调器有限总公司 室内机
WO2019206383A1 (de) * 2018-04-27 2019-10-31 Lavatec Laundry Technology Gmbh Trockner und verfahren zum betrieb eines trockners
US11976409B2 (en) 2018-04-27 2024-05-07 Lavatec Laundry Technology Gmbh Dryer and method for operating a dryer
DE102020101597A1 (de) 2020-01-23 2021-07-29 Miele & Cie. Kg Wäschetrockner

Also Published As

Publication number Publication date
ITPN910016A1 (it) 1992-09-13
IT1250380B (it) 1995-04-07
ITPN910016A0 (it) 1991-03-12

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