EP2208818B1 - Machine à laver dotée d'un générateur de vapeur d'écoulement auto-contrôlé et auto-nettoyant - Google Patents

Machine à laver dotée d'un générateur de vapeur d'écoulement auto-contrôlé et auto-nettoyant Download PDF

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Publication number
EP2208818B1
EP2208818B1 EP09150868.9A EP09150868A EP2208818B1 EP 2208818 B1 EP2208818 B1 EP 2208818B1 EP 09150868 A EP09150868 A EP 09150868A EP 2208818 B1 EP2208818 B1 EP 2208818B1
Authority
EP
European Patent Office
Prior art keywords
generating device
steam generating
washing machine
machine according
water
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.)
Not-in-force
Application number
EP09150868.9A
Other languages
German (de)
English (en)
Other versions
EP2208818A1 (fr
Inventor
Robert J. Pinkowski
Alvaro Vallejo
Kelly M. Hanson
Robert Poettger
Markus Beck
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
Original Assignee
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.)
Filing date
Publication date
Application filed by Whirlpool Corp filed Critical Whirlpool Corp
Priority to ES09150868.9T priority Critical patent/ES2528184T3/es
Priority to EP09150868.9A priority patent/EP2208818B1/fr
Priority to PL09150868T priority patent/PL2208818T3/pl
Publication of EP2208818A1 publication Critical patent/EP2208818A1/fr
Application granted granted Critical
Publication of EP2208818B1 publication Critical patent/EP2208818B1/fr
Not-in-force 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
    • 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 washing machine having a steam generating device with a heating element for heating supplied water to generate steam, comprising a temperature sensor for sensing a temperature of the steam generating device and a water supply valve for supplying water to the steam generating device.
  • the present invention relates to a method for removing calcium deposits from the walls of a steam generating device of a washing machine as well in order to extend the life of the unit.
  • washing machine we mean every kind of domestic appliance which uses water for cleaning clothes or dishes, including washers and dishwashers as well.
  • a washing machine of the above type is disclosed by EP 1659205 , in which the temperature sensor of the steam generating device outputs the sensed temperature to a control unit.
  • a control unit receives also the temperature signal from a temperature sensor which senses the temperature of the water supplied to the tub.
  • a control unit also for controlling the steaming operation requires a more powerful hardware of the control unit itself, which increases the overall cost of the appliance.
  • the interposition of an electronic control unit between the temperature sensor and the water supply valve may reduce the reliability and safety of the steam generating system, particularly in a zone of the washing machine where the heating element reaches high temperature, for instance during the preheating phase of the steam generating device.
  • Another drawback of the system disclosed by EP 1659205 is the use of the temperature signal from the temperature sensor of the steam generating device for controlling only the preheating phase thereof, while for switching off the water supply valve reference is made to a fixed designated time.
  • This approach makes the overall control more complex and moreover does not allow the system to continuously self-adapt to the actual conditions of the steam generating device, particularly to the amount of scale on the inside walls of the steamer.
  • EP-A-1889966 discloses a water supply control for a steam generator of a fabric treatment appliance using a temperature sensor.
  • EP-A-1865101 discloses a method for draining liquid from a steam generator of a fabric treatment appliance.
  • Calcium deposits building up on areas where temperature measurement devices are installed will also result in wrong temperature readings. Calcium deposits should be then broken off from the walls and carried out of the steam chamber towards the exhaust, so efficiency of the system and life are extended. During normal steam generation, some of the deposits can be spitted out of the chamber but a certain amount will stay in there and start clogging the outlet.
  • the present invention uses a method to control the steam generator in such a way a sudden thermal expansion is created in the chamber to break off the calcium deposits from the walls, without the need of an electronic control of the steamer.
  • the control is a simple, economical and self-adjusting one since it uses a combination of a thermostat mounted on the steam chamber to regulate the temperature of the steam generator and the amount of water going into it, and a solenoid valve controlling the water supply to the steam chamber.
  • the thermostat controlling the steaming temperature can be located at the inlet or the outlet side of the steam generator, depending on the power distribution along the chamber.
  • Control thermostat setting is preferably in the range 140°-160°C, with a differential preferably comprised between 5° and 45°C. This means that the thermostat mechanism will operate when the setup temperature between 140° and 160°C is reached and reset back when temperature drops 5°- 45°C (differential).
  • a flow-through steamer 10 comprising a tube-shaped steam chamber 12, a heating element 14 placed around the chamber 12, a water inlet 16 and an exhaust hose 18 connected to a tub (not shown) of a washing machine.
  • the water inlet 16 communicates with the central portion of a siphon 17 so that steam cannot go backwards unless inner pressure in the chamber 12 is higher than water column in the siphon, for instance when the steamer is clogged.
  • the steamer 10 is also provided with a safety outlet 19 in case inner pressure is too high (clogged steamer).
  • the inner wall of the tube-shaped chamber 12 presents a plurality of longitudinal grooves in order to improve cracking of calcium deposits in small pieces.
  • the electrical circuit of the steamer 10 ( figure 2 ) consists of a four thermal elements, i.e. two fuses 20, 22 and two thermostats 24 and 26. All these elements are in serial connection with the heating element 14.
  • the fuse 20 and thermostat 24, as well as the fuse 22 and thermostat 26, are in contact with a shaped plate soldered on the tube-shaped steam chamber 12 and outside wall 14a of the heater 14. This arrangement leads to a more stable steaming process over life and reduces significantly the reaction time in abnormal situations. Additionally it leads to a more precise valve control and therefore energy efficient steaming process.
  • a valve 21 for water supply control placed upstream the water inlet 16, is a solenoid valve and it is connected in parallel with the control thermostat 24. This latter can be for example a 150-25°C, which means that the bimetal mechanism of the thermostat will operate (i.e. close the circuit) until the set point temperature of 150°C is reached and reset back when temperature drops 25°C (differential).
  • the differential setting will then self-regulate the time the water supply is ON. The higher the difference between off and on set points, the longer the time; the longer the time, the bigger the amount of water supplied.
  • thermostat 24 When low set point is reached, the thermostat 24 will switch the water supply OFF and heating element 14 back ON to allow the steamer 10 to continue to boil the water supplied to the chamber 12. After all the water is steamed out, the system's temperature will start to go back up until it reaches the high set point temperature again (T1) to repeat the cycle.
  • the thermostat differential will self regulate the time during which the solenoid valve is open/closed.
  • Such thermostat differential can be fixed (inherent to the specific features of the thermostat), it can be set within the factory or it may be adjusted by the user through the user interface, for instance depending on actual water hardness.
  • the steam generator 10 has also a normally closed (NC) safety thermostat 26 which will be rated 20-40°C above the control thermostat setting so it keeps the steam generator energized as long as the water valve is off during the steaming process. In the case there is no water in the water supply, the control and safety thermostats will switch the steamer OFF.
  • NC normally closed
  • the terminals of the simple electrical circuit shown in figure 2 are connected to the control circuit of the machine (which is simply switching the unit on and off); in the simplest case they can be connected to a mechanical timer which turns on and off the steam heater for one or more predetermined periods of the washing cycle of the machine, according to the washing cycle selected by the user.
  • the circuit can be also connected to an electronic control unit of the washer; nevertheless it is important to notice that the control unit of the washer is involved only in switching on and off the steamer as a single component, and not in the control of the valve or of the heating element thereof, since their functions are self-adjusted by the circuit itself.
  • the triangle profile in the inner wall of the steam chamber additionally guaranties that the calcium deposits are breaking off in small pieces.
  • the calcium is then transported out by the turbulence and the inner pressure created by the heating of the boiling water. With the spitting of water, the broken calcium is leaving the tube. While in the beginning of the steamer life the spit water is neglectable, the amount of spitting water is increasing over lifetime due to the amount of residual calcium deposits which are still sticking at the tube walls. This means a higher thermal mass which takes longer to cool down and causes therefore a longer valve on time.
  • the temperature differential of the control thermostat can be specified in such a way it puts enough water in the chamber 12 so when the boiling process starts, it creates enough turbulence and water spitting though the exhaust 18 to carry out the broken deposits from the steam chamber. For example, using a steamer with 175 cm 3 capacity and 1000 W heating element, when filled over 40% of its volume, it will start spitting a certain amount of the water supplied.
  • the amount of spitted hot water needed to carry out the deposits can be calculated and defined through the differential value of the control thermostat (Valve ON time), as shown in the following table: Water input (cm 3 ) Spit water (cm 3 ) % Full % Spit 59.56 0 34.04% 0.00% 59.92 0 34.24% 0.00% 69.55 0 39.74% 0.00% 71.33 7 40.76% 9.81% 73.12 3 41.78% 4.10% 73.83 5 42.19% 6.77% 74.90 6 42.80% 8.01% 77.40 11 44.23% 14.21% 84.17 15 48.10% 17.82% 111.64 39 63.79% 34.93% 115.92 42 66.24% 36.23% 119.13 47 68.07% 39.45%
  • figure 4 it is shown the relationship between filling % and the % amount of spitted hot water needed to remove the scale deposits.
  • FIG 5 it is shown a second embodiment of the present invention in which a calcium trap 30 is used in order to collect the free pieces of scale breaking off from the steam chamber walls.
  • the trap 30 consists of a container located right in between the steam chamber 12 and the exhaust of the steamer 10. When big pieces of broken calcium are carried towards the outlet, they can precipitate down into the container by gravity. Since deposits are not staying in the steam chamber 12 anymore, it will also slow down the building of calcium on the walls when boiling the water so the efficiency and life of the steamer are extended.
  • Calcium can be collected in this container to avoid blocking the exhaust, and in this embodiment the safety outlet 19 shown in figure 1 (first embodiment) can be avoided. Small pieces will also precipitate down and some other will be still pushed out by the steam flow and spitted water.
  • a periodic, automatic cleaning routine can be used to dump the calcium contained in the trap directly to the drain through an automatic valve 32 or, it can be cleaned manually.
  • calcium trap can also be maintenance free through the life of the system. Trap can be drained out or stay full of water at all times. Since the container is directly attached to the steam chamber 12, it will always be in contact with boiling water so the formation of mold and bacteria is avoided.
  • a further embodiment of the present invention is to drive the steamer 10 with a combination of hot water and steam generation.
  • a predetermined amount of hot water can be calculated and defined through a differential value of the control thermostat (valve-on time) or by an electronic control.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Washing And Drying Of Tableware (AREA)
  • Cleaning By Liquid Or Steam (AREA)

Claims (14)

  1. Machine à laver ayant un dispositif générateur de vapeur d'eau (10) avec un élément de chauffage (14) pour chauffer l'eau fournie pour générer de la vapeur d'eau, comprenant un capteur de température (24) pour détecter la température du dispositif générateur de vapeur d'eau (10) et une vanne d'alimentation en eau (21) pour alimenter le dispositif générateur de vapeur d'eau, caractérisée en ce que le capteur de température est un thermostat de commande (24) avec un différentiel prédéterminé, connecté électriquement en série avec l'élément de chauffage (14) et en ce que la vanne d'alimentation en eau est une électrovanne (21) connectée électriquement en parallèle avec le thermostat de commande (24) de sorte que le réglage du différentiel autorégule la période pendant laquelle l'alimentation en eau est sur MARCHE.
  2. Machine à laver selon la revendication 1, dans laquelle un thermostat de sécurité (26) est connecté en série avec le thermostat de commande (24).
  3. Machine à laver selon la revendication 1 ou la revendication 2, dans laquelle le thermostat de commande (24) est situé à l'entrée du dispositif générateur de vapeur d'eau (10).
  4. Machine à laver selon la revendication 2, dans laquelle le thermostat de sécurité est du côté de sortie du dispositif générateur de vapeur d'eau (10).
  5. Machine à laver selon l'une quelconque des revendications précédentes, dans laquelle le thermostat de commande (24) présente un point de consigne arrêt compris entre 130 et 170 °C et un différentiel compris entre 5 et 45 °C, respectivement.
  6. Machine à laver selon l'une quelconque des revendications précédentes, dans laquelle le dispositif générateur de vapeur d'eau (10) a un volume compris entre 100 et 250 cm3.
  7. Machine à laver selon l'une quelconque des revendications précédentes, dans laquelle le dispositif générateur de vapeur d'eau présente un élément de chauffage (14) dont la puissance est comprise entre 500 et 1500 W.
  8. Machine à laver selon l'une quelconque des revendications précédentes, dans laquelle le dispositif générateur de vapeur d'eau (10) comprend une chambre de forme tubulaire (12) avec une surface interne pourvue d'une pluralité de rainures.
  9. Machine à laver selon la revendication 8, dans laquelle l'élément de chauffage (14) est en contact avec une plaque moulée brasée à la surface externe de la chambre de forme tubulaire (12).
  10. Machine à laver selon l'une quelconque des revendications précédentes, dans laquelle le dispositif générateur de vapeur d'eau (10) comprend un siphon (17) en aval de la vanne d'alimentation en eau (21).
  11. Machine à laver selon l'une quelconque des revendications précédentes, dans laquelle le dispositif générateur de vapeur d'eau comprend un dispositif de piégeage de calcium (30) en amont d'un tuyau souple d'évacuation (18).
  12. Procédé d'élimination de dépôts de calcium des parois d'un dispositif générateur de vapeur d'eau (10) d'une machine à laver comprenant un élément de chauffage (14) et une vanne d'alimentation en eau (16), qui envoie une quantité d'eau prédéterminée dans le dispositif générateur de vapeur d'eau préchauffé (10) de sorte qu'une certaine quantité d'eau chaude soit projetée afin d'éliminer les dépôts de calcium du dispositif, caractérisé en ce que la température est commandée au moyen d'un thermostat de commande (24) avec un différentiel prédéterminé, connecté électriquement en série avec l'élément de chauffage (14), la vanne d'alimentation en eau étant une électrovanne (21) connectée électriquement en parallèle avec le thermostat de commande (24), et en ce que le réglage du différentiel autorégule la période pendant laquelle l'alimentation se trouve sur MARCHE.
  13. Procédé selon la revendication 12, dans lequel l'eau fournie au dispositif générateur de vapeur d'eau (10) atteint plus de 40 % du volume du dispositif générateur de vapeur d'eau.
  14. Procédé selon la revendication 12 ou la revendication 13, dans lequel le dispositif générateur de vapeur d'eau a un volume aux environs de 175 cm3 et l'élément de chauffage (14) a une puissance aux environs de 1000 W.
EP09150868.9A 2009-01-19 2009-01-19 Machine à laver dotée d'un générateur de vapeur d'écoulement auto-contrôlé et auto-nettoyant Not-in-force EP2208818B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
ES09150868.9T ES2528184T3 (es) 2009-01-19 2009-01-19 Máquina de lavar provista con un generador de vapor de flujo continuo autocontrolado y autolimpiado
EP09150868.9A EP2208818B1 (fr) 2009-01-19 2009-01-19 Machine à laver dotée d'un générateur de vapeur d'écoulement auto-contrôlé et auto-nettoyant
PL09150868T PL2208818T3 (pl) 2009-01-19 2009-01-19 Maszyna piorąca/zmywająca zaopatrzona w samosterowny i samoczyszczący przepływowy generator pary

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP09150868.9A EP2208818B1 (fr) 2009-01-19 2009-01-19 Machine à laver dotée d'un générateur de vapeur d'écoulement auto-contrôlé et auto-nettoyant

Publications (2)

Publication Number Publication Date
EP2208818A1 EP2208818A1 (fr) 2010-07-21
EP2208818B1 true EP2208818B1 (fr) 2014-12-24

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ID=40756966

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EP09150868.9A Not-in-force EP2208818B1 (fr) 2009-01-19 2009-01-19 Machine à laver dotée d'un générateur de vapeur d'écoulement auto-contrôlé et auto-nettoyant

Country Status (3)

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EP (1) EP2208818B1 (fr)
ES (1) ES2528184T3 (fr)
PL (1) PL2208818T3 (fr)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060096333A1 (en) * 2004-11-05 2006-05-11 Samsung Electronics Co., Ltd. Steam generating device and washing machine having the same
KR20060055222A (ko) 2004-11-18 2006-05-23 삼성전자주식회사 세탁기 및 그 제어방법
US20070283509A1 (en) * 2006-06-09 2007-12-13 Nyik Siong Wong Draining liquid from a steam generator of a fabric treatment appliance
US7730568B2 (en) * 2006-06-09 2010-06-08 Whirlpool Corporation Removal of scale and sludge in a steam generator of a fabric treatment appliance
US7681418B2 (en) * 2006-08-15 2010-03-23 Whirlpool Corporation Water supply control for a steam generator of a fabric treatment appliance using a temperature sensor

Also Published As

Publication number Publication date
ES2528184T3 (es) 2015-02-05
PL2208818T3 (pl) 2015-04-30
EP2208818A1 (fr) 2010-07-21

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