EP2108730B1 - Washer/dryer and relevant operating cycle - Google Patents

Washer/dryer and relevant operating cycle Download PDF

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Publication number
EP2108730B1
EP2108730B1 EP08425240A EP08425240A EP2108730B1 EP 2108730 B1 EP2108730 B1 EP 2108730B1 EP 08425240 A EP08425240 A EP 08425240A EP 08425240 A EP08425240 A EP 08425240A EP 2108730 B1 EP2108730 B1 EP 2108730B1
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EP
European Patent Office
Prior art keywords
temperature
condensing
resistor
sensor
turning
Prior art date
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Active
Application number
EP08425240A
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German (de)
English (en)
French (fr)
Other versions
EP2108730A1 (en
Inventor
Lucio Gastaldelli
Andrea Olivieri
Alberto Tenero
Mauro Tosi
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.)
Bonferraro SpA
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Bonferraro SpA
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Filing date
Publication date
Application filed by Bonferraro SpA filed Critical Bonferraro SpA
Priority to DE602008001966T priority Critical patent/DE602008001966D1/de
Priority to EP08425240A priority patent/EP2108730B1/en
Priority to AT08425240T priority patent/ATE475740T1/de
Priority to ES08425240T priority patent/ES2348351T3/es
Priority to PL08425240T priority patent/PL2108730T3/pl
Publication of EP2108730A1 publication Critical patent/EP2108730A1/en
Application granted granted Critical
Publication of EP2108730B1 publication Critical patent/EP2108730B1/en
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    • 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
    • D06F34/00—Details of control systems for washing machines, washer-dryers or laundry dryers
    • D06F34/08—Control circuits or arrangements thereof
    • 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
    • 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
    • D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
    • D06F2105/28—Electric heating

Definitions

  • the present invention relates to washers/dryers, and in particular to a washer/dryer in which the drying system includes a feedback loop that allows an operation suitable to optimize time and consumptions of the laundry drying phase at the end of the washing cycle, as known e.g. from EP-A-1,666,655 .
  • a fan creates an air stream in the circuit and a resistor heats the air circulating in said circuit.
  • an electrovalve is opened to admit condensing water into a condensing duct, where the condensing water is kept in suspension by the suction created by the fan.
  • the fan receives partially cooled and dried air that is heated again by the resistor and returned to the tank.
  • the air heating resistor is turned off during the last minutes of the drying cycle, whereas the fan keeps on working so as to perform a laundry cooling step otherwise the laundry would be too hot for the user to remove it safely from the drum.
  • the object of the present invention is to provide a washer/dryer which overcomes said drawbacks, and a relevant operating cycle.
  • This object is achieved by means of a washer/dryer including at least three temperature sensors to detect the air temperature respectively in the tank, at the outlet of the condensing unit and downstream from the heating resistor.
  • Other advantageous features of the present washer/dryer are disclosed in the dependent claims.
  • the main advantage of this washer/dryer is that of carrying out the drying cycle while maintaining the optimum temperature conditions at the various points in the circuit, so as to increase the condensing effectiveness and decrease the drying time, with a subsequently lower consumption of power and condensing fluid.
  • a second important advantage of the present machine is that of optimizing the consumption of power and condensing fluid by adapting it to the extent of the laundry load to be dried.
  • Another significant advantage of this arrangement comes from its structural simplicity that allows to achieve the above-mentioned improvement in effectiveness without affecting the overall size of the machine and with only a minimum increase in manufacturing cost.
  • the drying circuit conventionally includes a centrifugal fan F connected to a condensing duct C where the stream of moist air, coming from the tank through an air entrance AE, flows in a direction opposite to the condensing water CW introduced in duct C through a relevant water entrance WE.
  • the moisture condensed in duct C is conveyed to the drain pump through a bottom drain D.
  • a resistor R with a relevant safety thermostat T, is arranged downstream from fan F in a return duct H to heat air prior to returning it to the tank.
  • the air temperature downstream from fan F is detected by a temperature sensor S3, in order to prevent the introduction into the tank of excessively hot air.
  • the novel aspect of the present invention is the presence of other two temperature sensors, namely a sensor S1 (not shown) detecting the air temperature in the tank and a sensor S2 arranged at the top of the condensing duct C, i.e. at the outlet of the condensing unit prior to the entrance of the air into fan F. Thanks to these two sensors S1, S2 it is possible to achieve a feedback loop that controls the operation of the condensing unit, as it will be explained hereunder with reference to Figs.2-4 .
  • the first time/temperature chart illustrated in Fig.2 shows the course of temperatures TS1 and TS2, i.e. the temperatures detected by sensors S1 and S2 respectively, and indicates three temperature thresholds Z0, W and Z1 at which different steps of the drying cycle take place. There is also indicated a time tr at which there is performed a preliminary "sensor reset" step required to take into account the inevitable manufacturing tolerances of the sensors.
  • the "sensor reset" step implies that, called ⁇ T the difference detected at time tr, the values of TS1 and TS2 will be corrected by ⁇ ⁇ T/2 or one of the two values will be used as a reference and the other one will be corrected by ⁇ ⁇ T, the sign of the correction depending on which sensor detects the higher temperature at time tr and/or is used as a reference.
  • said "sensor reset" step could be performed even only once, as long as one of the two sensors S1 or S2 is not replaced, since the detected difference depends on the manufacturing tolerances. However, since the sensors may get dirty or deteriorate during the machine life, without having to be replaced for this reason, in order to guarantee a correct operation of the machine it is preferable to perform this step at each operating cycle or at least periodically.
  • the second time/temperature chart illustrated in Fig.3 shows the course of temperatures TS3 detected by sensor S3 in the duct that introduces the air heated by resistor R into the tank. Furthermore, there are indicated the two temperature thresholds U3 and V3 representing respectively the maximum temperature at which resistor R is turned off and the minimum temperature at which the latter is turned back on.
  • the hot air introduced in the tank increases temperature TS1 detected by sensor S1, which controls the performing of a centrifugation that lasts a few minutes upon reaching the first threshold 20.
  • said centrifugation is present also in the conventional drying cycle, but it is carried out at a fixed moment in the cycle regardless of the laundry conditions. On the contrary, in the present machine this step is performed at the precise time when the tank reaches a preset temperature Z0, detected by S1, of maximum yield for extracting the residual moisture from the laundry.
  • the feedback provided by sensor S1 therefore allows to control the time of centrifugation in order to achieve the maximum power and performance yield.
  • the step following the centrifugation is that of turning on the condensing unit, i.e. admitting the condensing water CW into duct C through entrance WE in the case of the embodiment illustrated in Fig.1 .
  • Said turning on takes place only when sensor S1 detects that temperature TS1 in the tank has reached a second threshold Z1.
  • the time of turning off the condensing unit is determined by sensor S2 that detects when temperature TS2 decreases below the temperature threshold W, in order to prevent an excessive decrease in temperature of the air reaching resistor R.
  • the feedback provided by the pair of sensors S1, S2 allows to optimize both the consumption of condensing fluid in duct C and the power consumption by resistor R.
  • the "sensor reset" step not only allows to use as temperature sensors even inexpensive components such as NTC thermistors rather than other more expensive types of sensors, but it also serves to prevent machine malfunctionings in case of "converging" manufacturing tolerances of sensors S1 and S2.
  • the temperature thresholds W and Z1 are very close it could happen that with a sensor S1 erring by excess and a sensor S2 erring by defect the operation of the condensing unit is immediately stopped because the tolerance ranges of sensors S1, S2 overlap.
  • steps f)-h) depends on the value of thresholds W, U3, V3 since the operating periods of the condensing unit and resistor R depend respectively on the sensor pair S1, S2 and on sensor S3 that operate independently of each other.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Control Of Washing Machine And Dryer (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)
  • Meat, Egg Or Seafood Products (AREA)
  • Medicines Containing Material From Animals Or Micro-Organisms (AREA)
  • Beans For Foods Or Fodder (AREA)
EP08425240A 2008-04-10 2008-04-10 Washer/dryer and relevant operating cycle Active EP2108730B1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
DE602008001966T DE602008001966D1 (de) 2008-04-10 2008-04-10 Wasch-/Trockenvorrichtung und entsprechender Betriebszyklus
EP08425240A EP2108730B1 (en) 2008-04-10 2008-04-10 Washer/dryer and relevant operating cycle
AT08425240T ATE475740T1 (de) 2008-04-10 2008-04-10 Wasch-/trockenvorrichtung und entsprechender betriebszyklus
ES08425240T ES2348351T3 (es) 2008-04-10 2008-04-10 Lavadora/secadora y ciclo de funcionamiento correspondiente.
PL08425240T PL2108730T3 (pl) 2008-04-10 2008-04-10 Pralka/suszarka i odpowiedni cykl działania

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP08425240A EP2108730B1 (en) 2008-04-10 2008-04-10 Washer/dryer and relevant operating cycle

Publications (2)

Publication Number Publication Date
EP2108730A1 EP2108730A1 (en) 2009-10-14
EP2108730B1 true EP2108730B1 (en) 2010-07-28

Family

ID=39739787

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08425240A Active EP2108730B1 (en) 2008-04-10 2008-04-10 Washer/dryer and relevant operating cycle

Country Status (5)

Country Link
EP (1) EP2108730B1 (pl)
AT (1) ATE475740T1 (pl)
DE (1) DE602008001966D1 (pl)
ES (1) ES2348351T3 (pl)
PL (1) PL2108730T3 (pl)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2554740B1 (en) 2011-08-01 2019-09-04 Samsung Electronics Co., Ltd. Drying apparatus and washing machine having the same and control method thereof
EP2570548A1 (en) * 2011-09-19 2013-03-20 Electrolux Home Products Corporation N.V. A washer-dryer with at least one condenser
US9080283B2 (en) 2011-10-06 2015-07-14 Whirlpool Corporation Method to control a drying cycle of a laundry treating appliance
CN113417123A (zh) * 2021-07-23 2021-09-21 珠海格力电器股份有限公司 一种衣物烘干控制方法、干衣机及存储介质
CN114775216B (zh) * 2022-04-29 2023-07-21 珠海格力电器股份有限公司 一种衣物处理装置及其处理方法和洗干机

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20060061974A (ko) * 2004-12-02 2006-06-09 삼성전자주식회사 의류의 구김제거장치 및 그 방법
EP2055820B1 (en) * 2006-05-02 2013-04-10 Electrolux Home Products Corporation N.V. Steam supplying method and treatment apparatus

Also Published As

Publication number Publication date
PL2108730T3 (pl) 2010-12-31
ES2348351T3 (es) 2010-12-03
ATE475740T1 (de) 2010-08-15
EP2108730A1 (en) 2009-10-14
DE602008001966D1 (de) 2010-09-09

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