EP3063326A1 - A household appliance comprising a steam generator and the control method thereof - Google Patents

A household appliance comprising a steam generator and the control method thereof

Info

Publication number
EP3063326A1
EP3063326A1 EP14787205.5A EP14787205A EP3063326A1 EP 3063326 A1 EP3063326 A1 EP 3063326A1 EP 14787205 A EP14787205 A EP 14787205A EP 3063326 A1 EP3063326 A1 EP 3063326A1
Authority
EP
European Patent Office
Prior art keywords
heater
household appliance
steam generator
cut
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.)
Granted
Application number
EP14787205.5A
Other languages
German (de)
French (fr)
Other versions
EP3063326B1 (en
Inventor
Ahmet Burak TOP
Sukru Baris UNAL
Servet EFE
Ilkan Erdem
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.)
Arcelik AS
Original Assignee
Arcelik AS
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 Arcelik AS filed Critical Arcelik AS
Publication of EP3063326A1 publication Critical patent/EP3063326A1/en
Application granted granted Critical
Publication of EP3063326B1 publication Critical patent/EP3063326B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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 
    • D06F33/30—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
    • D06F33/34—Control of operational steps, e.g. optimisation or improvement of operational steps depending on the condition of the laundry of water filling
    • 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
    • D06F2103/16—Washing liquid 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
    • D06F2103/18—Washing liquid level
    • 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
    • D06F2103/38—Time, e.g. duration
    • 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
    • D06F2105/02—Water supply
    • 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
    • D06F2105/10—Temperature of washing liquids; Heating means therefor
    • 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
    • D06F37/00—Details specific to washing machines covered by groups D06F21/00 - D06F25/00
    • D06F37/42—Safety arrangements, e.g. for stopping rotation of the receptacle upon opening of the casing door

Definitions

  • the present invention relates to a household appliance comprising a steam generator and the control method thereof.
  • Steam generators are used to prevent creases in the laundry, cleansing the laundry from bad odors in washers like washing machine and laundry washer dryers, to humidify the cooking chamber in cooking devices like oven and to provide hygiene in dishwashers.
  • it is aimed to effectively convert water into steam effectively.
  • clogging of the pipes due to calcification decrease the effectiveness of the steam generator.
  • the generated steam leaving from the steam outlet opening and also from the water inlet opening causes the amount of steam delivered to the tub to decrease and the steam to concentrate in unwanted areas in the appliance.
  • a washing machine comprising a steam generator wherein the heater is arranged inside a hermetic container.
  • the aim of the present invention is the realization of a household appliance comprising a steam generator, of which the production and assembly costs are decreased.
  • the household appliance realized in order to attain the aim of the present invention, explicated in the first claim and the respective claims thereof, comprises a control unit that enables water to be taken into the steam generator by deciding that the water level has fallen under the minimum water level if the time period the heater reaches from the cut-in temperature to the cut-off temperature is less than a time period prerecorded in its memory.
  • a channel is situated that extend from the inlet opening on the reservoir into the reservoir and towards under the predetermined minimum water level.
  • a thermal fuse is used in order to cut off the current supplied to the heater in case of any problems. For example, in the situation wherein the temperature sensor malfunctions and the heater is supplied with continuous current, the thermal fuse blows out and the household appliance is prevented from damage.
  • the heater is of helical configuration wound around the reservoir. That the heater is wound around the reservoir provides a smaller contact area and water is heated faster with the same amount of power.
  • the household appliance of the present invention can be a washing machine, laundry washer dryer, dishwasher or a cooking device like oven.
  • the steam generator is controlled by the steps of:
  • the thermal fuse is used in order to stop operation of the heater in any kind of problem.
  • the channel extending below the minimum water level, stays continuously in the water thanks to the control unit detecting the temperature change rate on the surface of the heater and it is not required to use a water level sensor in the reservoir.
  • Production and assembly costs are enabled to be decreased by not using extra equipments, for example liquid level sensors, on the steam generator except the reservoir, the heater, the temperature sensor that are required for steam generation.
  • Figure 1 – is the perspective view of a steam generator.
  • Figure 2 – is the perspective view of a steam generator from another angle.
  • Figure 3 – is the top perspective view of a steam generator and a control unit.
  • Figure 4 – is the partial cross-sectional view of a steam generator.
  • the household appliance comprises a steam generator (1) having a reservoir (2) wherein water is stored, at least one inlet opening (3) and at least one outlet opening (4) arranged on the reservoir (2), a heater (5) that heats the water inside the reservoir (2) and a temperature sensor (6) that measures the temperature of the heater (5).
  • the household appliance of the present invention comprises a control unit (9) that enables water to be taken into the steam generator (1) by deciding that the water level has fallen under the minimum water level (h_min) and that the heater (5) is heated quickly due to low water level if the cut-in – cut-out time period of the heater (5) is less than a limit cut-in – cut-out time period (t_lim) prerecorded in its memory.
  • a control unit (9) that enables water to be taken into the steam generator (1) by deciding that the water level has fallen under the minimum water level (h_min) and that the heater (5) is heated quickly due to low water level if the cut-in – cut-out time period of the heater (5) is less than a limit cut-in – cut-out time period (t_lim) prerecorded in its memory.
  • the reservoir (2) is filled in with water from the inlet opening (3).
  • the reservoir (2) is heated by the heater (5) and the generated steam is delivered to the respective area from the outlet opening (4).
  • the temperature sensor (6) measures the temperature of the heater (5) surface and relays the data to the control unit (9).
  • the control unit (9) cuts off the current delivered to the heater (5) that has reached a predetermined cut-off temperature and supplies current to the heater (5) again when the temperature falls to reach a predetermined cut-in temperature. This process continues until steam is generated in the amount and/or time period determined by the user or the manufacturer.
  • the temperature of the heater (5) surface increases faster and thus the cut-off temperature is reached in a shorter time period.
  • the control unit (9) decides that the water in the reservoir (2) has fallen below the minimum level (h_min) and enables water to be taken into the reservoir (2).
  • the steam generator (1) comprises a channel (8) that extends from the inlet opening (3) to below the predetermined minimum water level (h_min) that is required to generate steam efficiently.
  • h_min predetermined minimum water level
  • the steam generator (1) comprises a thermal fuse (7) for the heater (5) to operate safely.
  • the thermal fuse (7) prevents the heater (5) from damaging the household appliance by continuing to operate when the temperature sensor (6) malfunctions in any way or comes to the end of its economic life. In the situation the heater (5) continues to operate continuously and the surface of the heater (5) reaches the limit temperature, the thermal fuse (7) cuts off the current supplied to the heater (5).
  • the steam generator (1) comprises a helical heater (5) wound around the reservoir (2).
  • the surface area contacted by the heater (5) is decreased and the water in the reservoir (2) is enabled to be heated faster thanks to the helical heater (5) wound around the reservoir (2).
  • the household appliance is a washing machine.
  • the household appliance is a laundry washing and drying machine.
  • the steam generator (1) provides steam in order to decrease the creases of the laundry.
  • the household appliance is a dishwasher.
  • the steam generator (1) provides steam so that the dishes are washed in a more hygienic manner.
  • the household appliance is a cooking device.
  • the steam generator (1) provides steam in order to humidify the cooking chamber.
  • the steam generator (1) is controlled by a control method comprising the steps of:
  • the channel (8) used in the household appliance of the present invention and extending from the inlet opening (3) to just below the minimum water level (h_min) and thanks to the operating algorithm of the steam generator (1), the end of the channel (8) is enabled to always remain in the water and steam is not discharged from the inlet opening (3).
  • the household appliance is enabled to operate safely by means of the thermal fuse (7) used on the steam generator (1).
  • the temperature change rate on the surface of the heater (5) is monitored by the control unit (9) and it is not required to use a level sensor for determining the level of water in the reservoir (2), thus decreasing the production costs.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Control Of Washing Machine And Dryer (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)
  • Accessory Of Washing/Drying Machine, Commercial Washing/Drying Machine, Other Washing/Drying Machine (AREA)

Abstract

The present invention relates to a household appliance comprising a steam generator (1) having a reservoir (2) wherein water is stored, at least one inlet opening (3) and at least one outlet opening (4) arranged on the reservoir (2), a heater (5) that heats the water inside the reservoir (2) and a temperature sensor (6) that measures the temperature of the heater (5).

Description

    A HOUSEHOLD APPLIANCE COMPRISING A STEAM GENERATOR AND THE CONTROL METHOD THEREOF
  • The present invention relates to a household appliance comprising a steam generator and the control method thereof.
  • Steam generators are used to prevent creases in the laundry, cleansing the laundry from bad odors in washers like washing machine and laundry washer dryers, to humidify the cooking chamber in cooking devices like oven and to provide hygiene in dishwashers. In steam generators, it is aimed to effectively convert water into steam effectively. In the steam generators supplied by mains water, clogging of the pipes due to calcification decrease the effectiveness of the steam generator. Furthermore, the generated steam leaving from the steam outlet opening and also from the water inlet opening causes the amount of steam delivered to the tub to decrease and the steam to concentrate in unwanted areas in the appliance.
  • In the Patent Application No. EP2287583, a washing machine is disclosed having a steam generator wherein the temperature is measured by NTC sensors.
  • In the Patent Application No. US2005034489, a washing machine comprising a steam generator is disclosed wherein the heater is arranged inside a hermetic container.
  • The aim of the present invention is the realization of a household appliance comprising a steam generator, of which the production and assembly costs are decreased.
  • The household appliance realized in order to attain the aim of the present invention, explicated in the first claim and the respective claims thereof, comprises a control unit that enables water to be taken into the steam generator by deciding that the water level has fallen under the minimum water level if the time period the heater reaches from the cut-in temperature to the cut-off temperature is less than a time period prerecorded in its memory.
  • In an embodiment of the present invention, a channel is situated that extend from the inlet opening on the reservoir into the reservoir and towards under the predetermined minimum water level. Thus, when the steam generator generates steam, steam is not discharged from the inlet opening in any way and the generated steam is enabled to be utilized almost entirely. Furthermore, since steam is not discharged from the inlet opening, water condensation is prevented in undesired areas, for example in the water inlet line, in areas where the electronic components of the household appliance are located.
  • In an embodiment of the present invention, a thermal fuse is used in order to cut off the current supplied to the heater in case of any problems. For example, in the situation wherein the temperature sensor malfunctions and the heater is supplied with continuous current, the thermal fuse blows out and the household appliance is prevented from damage.
  • In an embodiment of the present invention, the heater is of helical configuration wound around the reservoir. That the heater is wound around the reservoir provides a smaller contact area and water is heated faster with the same amount of power.
  • The household appliance of the present invention can be a washing machine, laundry washer dryer, dishwasher or a cooking device like oven.
  • In an embodiment of the present invention, the steam generator is controlled by the steps of:
    • Receiving water from the inlet opening,
    • Cutting water intake as water is discharged from the outlet opening,
    • Operating the heater,
    • Operating the heater until the surface of the heater reaches the cut-off temperature
    • Turning off the heater when the surface of the heater reaches the cut-off temperature,
    • Operating the heater again when the temperature of the surface of the heater falls to reach the cut-in temperature,
    • Repeating the last two steps for a certain time period.
  • In the household appliance of the present invention, the thermal fuse is used in order to stop operation of the heater in any kind of problem. The channel, extending below the minimum water level, stays continuously in the water thanks to the control unit detecting the temperature change rate on the surface of the heater and it is not required to use a water level sensor in the reservoir. Production and assembly costs are enabled to be decreased by not using extra equipments, for example liquid level sensors, on the steam generator except the reservoir, the heater, the temperature sensor that are required for steam generation.
  • The steam generator realized in order to attain the aim of the present invention is illustrated in the attached figures, where:
  • Figure 1 – is the perspective view of a steam generator.
  • Figure 2 – is the perspective view of a steam generator from another angle.
  • Figure 3 – is the top perspective view of a steam generator and a control unit.
  • Figure 4 – is the partial cross-sectional view of a steam generator.
  • The elements illustrated in the figures are numbered as follows:
  • 1. Steam generator
  • 2. Reservoir
  • 3. Inlet opening
  • 4. Outlet opening
  • 5. Heater
  • 6. Temperature sensor
  • 7. Thermal fuse
  • 8. Channel
  • 9. Control unit
  • The household appliance comprises a steam generator (1) having a reservoir (2) wherein water is stored, at least one inlet opening (3) and at least one outlet opening (4) arranged on the reservoir (2), a heater (5) that heats the water inside the reservoir (2) and a temperature sensor (6) that measures the temperature of the heater (5).
  • The household appliance of the present invention comprises a control unit (9) that enables water to be taken into the steam generator (1) by deciding that the water level has fallen under the minimum water level (h_min) and that the heater (5) is heated quickly due to low water level if the cut-in – cut-out time period of the heater (5) is less than a limit cut-in – cut-out time period (t_lim) prerecorded in its memory.
  • In the household appliance of the present invention, the reservoir (2) is filled in with water from the inlet opening (3). The reservoir (2) is heated by the heater (5) and the generated steam is delivered to the respective area from the outlet opening (4). The temperature sensor (6) measures the temperature of the heater (5) surface and relays the data to the control unit (9). The control unit (9) cuts off the current delivered to the heater (5) that has reached a predetermined cut-off temperature and supplies current to the heater (5) again when the temperature falls to reach a predetermined cut-in temperature. This process continues until steam is generated in the amount and/or time period determined by the user or the manufacturer. When the water level in the reservoir (2) decreases, the temperature of the heater (5) surface increases faster and thus the cut-off temperature is reached in a shorter time period. When the time period the surface of the heater (5) reaches from the cut-in temperature to the cut-off temperature is shorter than the time period of reaching from the cut-in temperature to the cut-off temperature prerecorded in the memory of the control unit (9), the control unit (9) decides that the water in the reservoir (2) has fallen below the minimum level (h_min) and enables water to be taken into the reservoir (2).
  • In an embodiment of the present invention, the steam generator (1) comprises a channel (8) that extends from the inlet opening (3) to below the predetermined minimum water level (h_min) that is required to generate steam efficiently. Thus, energy losses and water condensation in undesired areas are prevented by preventing steam discharge from the end of the channel (8) that maintains water intake.
  • In an embodiment of the present invention, the steam generator (1) comprises a thermal fuse (7) for the heater (5) to operate safely. The thermal fuse (7) prevents the heater (5) from damaging the household appliance by continuing to operate when the temperature sensor (6) malfunctions in any way or comes to the end of its economic life. In the situation the heater (5) continues to operate continuously and the surface of the heater (5) reaches the limit temperature, the thermal fuse (7) cuts off the current supplied to the heater (5).
  • In an embodiment of the present invention, the steam generator (1) comprises a helical heater (5) wound around the reservoir (2). The surface area contacted by the heater (5) is decreased and the water in the reservoir (2) is enabled to be heated faster thanks to the helical heater (5) wound around the reservoir (2).
  • In an embodiment of the present invention, the household appliance is a washing machine.
  • In an embodiment of the present invention, the household appliance is a laundry washing and drying machine. The steam generator (1) provides steam in order to decrease the creases of the laundry.
  • In an embodiment of the present invention, the household appliance is a dishwasher. The steam generator (1) provides steam so that the dishes are washed in a more hygienic manner.
  • In an embodiment of the present invention, the household appliance is a cooking device. The steam generator (1) provides steam in order to humidify the cooking chamber.
  • In an embodiment of the present invention, the steam generator (1) is controlled by a control method comprising the steps of:
    • Receiving water from the inlet opening (3),
    • Cutting off water intake as water is discharged from the outlet opening (4),
    • Operating the heater (5),
    • Heating the surface of the heater (5) until reaching the cut-off temperature,
    • Turning off the heater (5) when the surface of the heater (5) reaches the cut-off temperature,
    • Operating the heater (5) again when the temperature of the surface of the heater (5) falls to reach the cut-in temperature,
    • Repeating the last two steps for a certain time period.
  • Thanks to the channel (8) used in the household appliance of the present invention and extending from the inlet opening (3) to just below the minimum water level (h_min) and thanks to the operating algorithm of the steam generator (1), the end of the channel (8) is enabled to always remain in the water and steam is not discharged from the inlet opening (3). The household appliance is enabled to operate safely by means of the thermal fuse (7) used on the steam generator (1). The temperature change rate on the surface of the heater (5) is monitored by the control unit (9) and it is not required to use a level sensor for determining the level of water in the reservoir (2), thus decreasing the production costs.

Claims (9)

  1. A household appliance comprising a steam generator (1) having a reservoir (2) wherein water is stored, at least one inlet opening (3) and at least one outlet opening (4) arranged on the reservoir (2), a heater (5) that heats the water inside the reservoir (2) and a temperature sensor (6) that measures the temperature of the heater (5), characterized in that a control unit (9) that enables water to be taken into the steam generator (1) by deciding that the water level has fallen under the minimum water level (h_min) if the cut-in – cut-out time period of the heater (5) is less than a limit cut-in – cut-out time period (t_lim) prerecorded in its memory.
  2. A household appliance as in Claim 1, characterized in that the steam generator (1) having a channel (8) that extends from the inlet opening (3) to below the predetermined minimum water level (h_min).
  3. A household appliance as in any one of the above claims, characterized in that the steam generator (1) having a thermal fuse (7) for the safe operation of the heater (5).
  4. A household appliance as in any one of the above Claims, characterized in that the steam generator (1) having the helical heater (5) wound around the reservoir (2).
  5. A household appliance as in any one of the above claims, which is a washing machine.
  6. A household appliance as in any one of the Claims 1 to 4, which is a laundry washing and drying machine.
  7. A household appliance as in any one of the Claims 1 to 4, which is a dishwasher.
  8. A household appliance as in any one of the Claims 1 to 4, which is a cooking device.
  9. For a steam generator (1) as in any one of the above claims, a control method characterized by the following steps:
    - Receiving water from the inlet opening (3),
    - Cutting off water intake as water is discharged from the outlet opening (4),
    - Operating the heater (5),
    - Heating the surface of the heater (5) until reaching the cut-off temperature,
    - Turning off the heater (5) when the surface of the heater (5) reaches the cut-off temperature,
    - Operating the heater (5) again when the temperature of the surface of the heater (5) falls to reach the cut-in temperature,
    - Repeating the last two steps for a certain time period.
EP14787205.5A 2013-11-01 2014-10-24 A household appliance comprising a steam generator and the control method thereof Active EP3063326B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TR201312671 2013-11-01
PCT/EP2014/072869 WO2015062987A1 (en) 2013-11-01 2014-10-24 A household appliance comprising a steam generator and the control method thereof

Publications (2)

Publication Number Publication Date
EP3063326A1 true EP3063326A1 (en) 2016-09-07
EP3063326B1 EP3063326B1 (en) 2023-01-04

Family

ID=51790704

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14787205.5A Active EP3063326B1 (en) 2013-11-01 2014-10-24 A household appliance comprising a steam generator and the control method thereof

Country Status (2)

Country Link
EP (1) EP3063326B1 (en)
WO (1) WO2015062987A1 (en)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100666318B1 (en) 2003-08-13 2007-01-10 엘지전자 주식회사 Steam generator for drum washing machine
EP1616990B1 (en) * 2004-07-13 2017-08-30 LG Electronics, Inc. Washing machine with steam generation apparatus
KR100793800B1 (en) * 2006-06-30 2008-01-11 엘지전자 주식회사 Washing machine and steam generator control method
EP2287583A1 (en) 2009-08-18 2011-02-23 BSH Bosch und Siemens Hausgeräte GmbH Sensor for Measuring a Temperature of a Heater in a Laundry Appliance, and Steam Generator
KR101848659B1 (en) * 2011-08-22 2018-04-13 엘지전자 주식회사 Laundry machine inclduing a steam generator and the controlling method of the same
US9150997B2 (en) * 2011-08-22 2015-10-06 Lg Electronics Inc. Home appliance including steam generator and controlling method of the same

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
None *
See also references of WO2015062987A1 *

Also Published As

Publication number Publication date
WO2015062987A1 (en) 2015-05-07
EP3063326B1 (en) 2023-01-04

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