EP2208819B1 - Verfahren zur Detektion des Lebensdauerendzustands eines in Haushaltsgeräten verwendeten Dämpfers und Haushaltshaltsgeräte mit solch einem Verfahren - Google Patents

Verfahren zur Detektion des Lebensdauerendzustands eines in Haushaltsgeräten verwendeten Dämpfers und Haushaltshaltsgeräte mit solch einem Verfahren Download PDF

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Publication number
EP2208819B1
EP2208819B1 EP09150871A EP09150871A EP2208819B1 EP 2208819 B1 EP2208819 B1 EP 2208819B1 EP 09150871 A EP09150871 A EP 09150871A EP 09150871 A EP09150871 A EP 09150871A EP 2208819 B1 EP2208819 B1 EP 2208819B1
Authority
EP
European Patent Office
Prior art keywords
steamer
temperature
control unit
washing machine
tub
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.)
Expired - Fee Related
Application number
EP09150871A
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English (en)
French (fr)
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EP2208819A1 (de
Inventor
Alvaro Vallejo
Markus Beck
Robert Poettger
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 Corp
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Whirlpool Corp
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.)
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Publication date
Application filed by Whirlpool Corp filed Critical Whirlpool Corp
Priority to PL09150871T priority Critical patent/PL2208819T3/pl
Priority to ES09150871T priority patent/ES2367759T3/es
Priority to EP09150871A priority patent/EP2208819B1/de
Publication of EP2208819A1 publication Critical patent/EP2208819A1/de
Application granted granted Critical
Publication of EP2208819B1 publication Critical patent/EP2208819B1/de
Expired - Fee Related 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
    • D06F39/00—Details of washing machines not specific to a single type of machines covered by groups D06F9/00 - D06F27/00 
    • D06F39/40—Steam generating arrangements
    • 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 
    • D06F33/50—Control of washer-dryers characterised by the purpose or target of the control
    • D06F33/52—Control of the operational steps, e.g. optimisation or improvement of operational steps depending on the condition of the laundry
    • D06F33/65—Control of the operational steps, e.g. optimisation or improvement of operational steps depending on the condition of the laundry of conditioning or finishing phases, e.g. for smoothing or removing creases

Definitions

  • the present invention relates to a method for assessing the working conditions of a flow through steamer used in domestic appliances, particularly for assessing the ageing or clogging of the steamer due to calcium deposits or the like
  • a flow through steamer used in domestic appliances, particularly for assessing the ageing or clogging of the steamer due to calcium deposits or the like
  • a self controlled steamer can be used for carrying out the method, which uses an electromechanical control to regulate the water and temperature needed to produce steam.
  • electromechanical control to regulate the water and temperature needed to produce steam.
  • other steamers for instance electronically controlled, can be used as well.
  • a control thermostat located at the water inlet side, detects when the steam chamber is pre-heated to switch the heating element OFF and turn the electrical water supply valve ON, so the water is introduced in the chamber to continue with the steaming process.
  • the control thermostat When the fresh water introduced in the chamber cools the steamer down, the control thermostat will switch the water valve OFF and bring the steamer back ON to continue to boil all water sitting in the chamber. When all water is steamed out, the system will pre-heat again and repeat the steaming cycle. This steaming cycle will continue to repeat as long as the steam generator is energized. Steaming cycle time will depend on voltage, water flow rate and mainly on the level of calcification in the chamber. When the calcium deposits start to build up, they become an insulation layer that will decrease the capability of the steamer to transfer the heat to the water, so the production of the steam and efficiency is affected. Since the heat will not easily go to the water, it will continue to heat up the outside of the chamber, causing the system to work at a higher temperature.
  • the steamer will have a connection to the electronic board of the appliance which will not be used only for energizing or deenergizing the steamer in the appliance, but also for supervising (monitoring) the cycling of the thermostat, and particularly for measuring the duration of every thermostat cycle (steaming cycle) as well as counting the number of cycles through the life of the system or counting the life time of the steaming system (addition of steam time of every wash cycle). Knowing the cycle duration and total number of steaming cycles, the control of the appliance can predict the level of calcification in the unit.
  • T a tub of a washing machine in which is mounted a rotating drum D.
  • the washing machine comprises a flow through steamer 10 having a water inlet 15 controlled by an electrical valve 16 ( figures 2 and 3 ) and a water outlet 18 connected to the tub T.
  • the electrical circuit of the steamer 10 comprises also a control thermostat 24, a safety thermostat 26 and two fuses 20, 22 all connected in series with a heating element 14 of the steamer.
  • the control thermostat 24 has a connection 25 to a control unit 27 of the washing machine.
  • every steaming cycle lasts approximately 160 seconds when the steamer 10 is brand new (St1: steam cycle time measured from peak to peak).
  • St1 steam cycle time measured from peak to peak.
  • temperatures T1 and T2 at different positions along the steamer 10 are reported, particularly temperature T1 of the metal tube near the inlet of the steamer 10 (position A in figure 2 ) and temperature T2 of the metal tube near the outlet of the steamer (position B in figure 2 ).
  • Cycle time will drop approximately 40-50% to approx. 85 seconds when the steamer is almost clogged (St2), as seen in figure 5 , i.e. near the "end of life" of the steamer 10.
  • Data can be saved as St1 time in the memory of the control unit 27 and such unit continues to do periodic actual time measurements to compare values through the life of the system. This comparison can be made with a fixed threshold value, or such value can be also calculated by the electronic control unit of the washing machine on the basis of the initial St1 time.
  • valve on time gives further information about the behavior of the steamer.
  • the valve on time is between 15 - 45s depending on the steamer life.
  • the valve on time is short and due to calcification the valve on time increases.
  • the safety thermostat 26 is switching which indicates that either no water is going inside the steamer ( fig.5 ) or the steamer is heavily calcified and running in a mode where only a little steam quantity can be expected.
  • no water is going inside the steamer there will follow a too long valve on cycle to the too short one.
  • the steamer is completely blocked ( Fig 4 ).
  • the valve on time can be measured.
  • the measured potential PSV ( fig.4 ) is in case of valve on high and in case of heater on low.
  • the steaming cycle time can be also correlated with the temperature gain in the inside of the washing machine, where the steam is being supplied.
  • the system is able determine in a more accurate way the level of calcification of the steamer so the end of the life can de predicted more accurately.
  • the system can measure the temperature gain through a temperature sensor 29 located inside the tub T where the steam is being injected.
  • a temperature sensor 29 located inside the tub T where the steam is being injected.
  • the efficiency drop on the steam generator will also drop the temperature gain in the system, for example to 0.5° C per minute.
  • Controls can also use this information to shoot the steam system down and display error messages as required.
  • FIG 7 it is shown a first routine used for detecting a condition of "end of life" of the steamer 10.
  • step 40 carried out when the washing machine is switched on the first time, a heating cycle time St1 of the steamer is measured and stored in a memory of the control unit (step 42).
  • step 44 it is measured and recorded the temperature NTC1 reached by the tub T.
  • the temperature NTC1 in the tub is measured again (step 46) and after a predetermined number of steaming cycles the heating cycle time is measured again (step 48), which will be St2, i.e. different from the cycle time St1 measured and stored when the washing machine was brand new.
  • step 50 a comparison is made between the temperatures NTC1 inside the tub at two different times; if the temperature gain is lower than a predetermined value, then the steamer is shut down.
  • step 52 a comparison is made between the heating cycle time St1 stored in the control unit 27 and the actual cycle time St2 (step 52). If the ratio between St2 and St1 is equal or below a certain threshold value "X”, then the routine carries out again the step 50 where the temperature gain is compared to a threshold value. If the ratio St2/St1 is above such threshold value, the steam routine can go on.
  • figure 8 it is shown a second auxiliary routine for assessing the "end of life" condition of the steamer 10.
  • step 54 the temperature NTC2 in the bypass conduit 30 ( figure 1 ) is measured and in step 56 a comparison is made with a predetermined fix value AT. If the temperature NTC2 is substantially below AT, then steam routine is continued; if the temperature NTC2 is equal or higher than AT, then steamer 10 is shut down.
  • temperature AT can be selected in a range of 70 - 95°C. AT gets to 100°C when the steamer outlet 18 is completely calcified or blocked because the practically pressureless steam (100°C) goes through the overflow hose 30 and NTC2 is sensing that. A temperature below 70°C for AT should be only selected if hot water should be sensed as well.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Control Of Washing Machine And Dryer (AREA)

Claims (9)

  1. Verfahren zum Bestimmen von Arbeitsbedingungen eines Verdampfers (10), der in häuslichen Anwendungen verwendet wird, insbesondere zum Bestimmen seiner Alterung oder seines Verstopfens aufgrund von Kalkablagerungen oder dergleichen, dadurch gekennzeichnet, dass es ein Messen zumindest eines Parameters, der mit dem Heizzyklus des Verdampfers (10) verbunden ist, ein Vergleichen eines solchen gemessenen Werts mit einem vorbestimmten (St1) und ein Bereitstellen eines Signals, das für die vorliegenden Arbeitsbedingungen des Verdampfers oder eine Vorhersage hiervon indikativ ist, umfasst.
  2. Verfahren nach Anspruch 1, wobei der Parameter die Zeit (St2) der Heizzyklen des Verdampfers (10) ist.
  3. Verfahren nach Anspruch 1 oder 2, wobei der Parameter die Gesamtzahl der Heizzyklen ist, die durch den Verdampfer (10) durchgeführt wurden.
  4. Verfahren nach einem der vorhergehenden Ansprüche, bei dem der Verdampfer (10) in einer Waschmaschine mit einer Tonne (T) verwendet wird, wobei es ferner ein Messen des Temperaturanstiegs innerhalb der Tonne (T) und ein Vergleichen hiervon mit einem vorbestimmten Wert umfasst.
  5. Verfahren nach einem der Ansprüche 1-3, bei dem der Verdampfer (10) in einer Waschmaschine verwendet wird, die einen Waschmittelspender (32) aufweist, wobei es ein Ausrüsten des Verdampfers (10) mit einem Bypass (30) in Richtung des Waschmittelspenders (32), ein Messen der Temperatur (NTC2) in dem Bypass (30) oder in dem Waschmittelspender (32) und ein Bereitstellen eines Signals, das für einen verstopften Verdampfer (10) indikativ ist, wenn die gemessene Temperatur (NTC2) höher als Umgebungstemperatur (AT) ist, umfasst.
  6. Verfahren nach Anspruch 1, wobei der Parameter die Zeit ist, in der das Zuführventil (16) zu dem Verdampfer (10) geöffnet bleibt, wobei diese Zeit ferner für eine Fehlfunktion wegen eines geschlossenen Wasserhahns oder eines Defekts der Wasserstromerkennung oder wegen eines verstopften Auslasses des Verdampfers (10) indikativ ist.
  7. Waschmaschine mit einer Steuerungseinheit (27), einem Durchlaufverdampfer (10) mit einem Heizelement (14), einem elektrischen Wasserzuführungsventil (16) und einem Temperatursensor (24), der mit der Steuerungseinheit (27) verbunden ist, wobei der Temperatursensor (24) dazu angepasst ist, der Steuerungseinheit (27) Temperatursignale bereitzustellen, dadurch gekennzeichnet, dass die Steuerungseinheit (27) dazu angepasst ist, die Zykluszeit (St1, St2) des Heizelements (14) und/oder die Gesamtzahl der Heizzyklen und/oder die Gesamtzeit, während der das Wasserzuführungsventil (16) in einem offenen Zustand ist, zu messen und den gemessenen Wert mit einem vorbestimmten Schwellenwert zu vergleichen, wobei die Steuerungseinheit (27) dazu angepasst ist, ein Signal bereitzustellen, das für die vorliegenden Arbeitsbedingungen des Verdampfers (10), insbesondere in Verbindung mit seiner Alterung und/oder einer Verstopfung wegen Kalkablagerungen oder dergleichen, oder eine Vorhersage hiervon, indikativ ist.
  8. Waschmaschine nach Anspruch 7, umfassend eine Tonne (T), wobei sie ferner einen Hilfstemperatursensor (29) aufweist, der in der Tonne (T) angeordnet ist, wobei der Steuerungsschaltkreis (27) dazu angepasst ist, den Temperaturanstieg innerhalb der Tonne (T) nach der Aktivierung des Verdampfers (10) zu bestimmen, wobei dieser Anstieg dazu angepasst ist, durch die Steuerungseinheit (27) mit einem vorbestimmten Wert verglichen zu werden, um ein weiteres Signal bereitzustellen, das für die Arbeitsbedingungen des Verdampfers (10) indikativ ist.
  9. Waschmaschine nach Anspruch 7 oder 8 mit einem Waschmittelspender (32), wobei der Verdampfer (10) eine Bypassleitung (30), die mit dem Waschmittelspender (32) verbunden ist, aufweist, wobei dieser Spender (32) mit einem weiteren Hilfstemperatursensor (31) versehen ist, wobei die Steuerungseinheit (27) dazu angepasst ist, einen Anstieg der Temperatur stromaufwärts oder innerhalb des Waschmittelspenders (32) über die Umgebungstemperatur (AT) hinaus zu erkennen, um ein Signal bereitzustellen, das für einen Verstopfungszustand des Verdampfers (10) indikativ ist.
EP09150871A 2009-01-19 2009-01-19 Verfahren zur Detektion des Lebensdauerendzustands eines in Haushaltsgeräten verwendeten Dämpfers und Haushaltshaltsgeräte mit solch einem Verfahren Expired - Fee Related EP2208819B1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
PL09150871T PL2208819T3 (pl) 2009-01-19 2009-01-19 Sposób wykrywania stanu całkowitego zużycia wytwornicy pary wykorzystywanej w urządzeniach gospodarstwa domowego i urządzenie gospodarstwa domowego wykorzystujące taki sposób
ES09150871T ES2367759T3 (es) 2009-01-19 2009-01-19 Método para detectar la condición de fin de vida de un vaporizador usado en electrodomésticos, y electrodomésticos que emplea dicho método.
EP09150871A EP2208819B1 (de) 2009-01-19 2009-01-19 Verfahren zur Detektion des Lebensdauerendzustands eines in Haushaltsgeräten verwendeten Dämpfers und Haushaltshaltsgeräte mit solch einem Verfahren

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP09150871A EP2208819B1 (de) 2009-01-19 2009-01-19 Verfahren zur Detektion des Lebensdauerendzustands eines in Haushaltsgeräten verwendeten Dämpfers und Haushaltshaltsgeräte mit solch einem Verfahren

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EP2208819A1 EP2208819A1 (de) 2010-07-21
EP2208819B1 true EP2208819B1 (de) 2011-08-10

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EP09150871A Expired - Fee Related EP2208819B1 (de) 2009-01-19 2009-01-19 Verfahren zur Detektion des Lebensdauerendzustands eines in Haushaltsgeräten verwendeten Dämpfers und Haushaltshaltsgeräte mit solch einem Verfahren

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ES (1) ES2367759T3 (de)
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104802501A (zh) * 2015-03-25 2015-07-29 江苏轻石科技有限公司 一种智能控温控湿蒸化机
US9587856B2 (en) 2013-06-14 2017-03-07 Whirlpool Corporation Methods, apparatus and articles of manufactures to detect impurity deposits in flow-through water heaters

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2402498A1 (de) * 2010-07-02 2012-01-04 Miele & Cie. KG Verfahren zum Betreiben einer Wäschebehandlungsmaschine mit Dampferzeugungseinrichtung und Wäschebehandlungsmaschine
RU2536030C2 (ru) 2012-02-06 2014-12-20 Эл Джи Электроникс Инк. Машина для обработки белья

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070283728A1 (en) * 2006-06-09 2007-12-13 Nyik Siong Wong Prevention of scale and sludge in a steam generator of a fabric treatment appliance
US7707859B2 (en) * 2006-08-15 2010-05-04 Whirlpool Corporation Water supply control for a steam generator of a fabric treatment appliance
US8037565B2 (en) * 2007-08-31 2011-10-18 Whirlpool Corporation Method for detecting abnormality in a fabric treatment appliance having a steam generator

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9587856B2 (en) 2013-06-14 2017-03-07 Whirlpool Corporation Methods, apparatus and articles of manufactures to detect impurity deposits in flow-through water heaters
CN104802501A (zh) * 2015-03-25 2015-07-29 江苏轻石科技有限公司 一种智能控温控湿蒸化机
CN104802501B (zh) * 2015-03-25 2019-01-01 江苏轻石科技有限公司 一种智能控温控湿蒸化机

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EP2208819A1 (de) 2010-07-21
ES2367759T3 (es) 2011-11-08
PL2208819T3 (pl) 2011-11-30

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