EP1551272B1 - A method for drying washed dishes, and a device for its implementation - Google Patents

A method for drying washed dishes, and a device for its implementation Download PDF

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Publication number
EP1551272B1
EP1551272B1 EP03791535A EP03791535A EP1551272B1 EP 1551272 B1 EP1551272 B1 EP 1551272B1 EP 03791535 A EP03791535 A EP 03791535A EP 03791535 A EP03791535 A EP 03791535A EP 1551272 B1 EP1551272 B1 EP 1551272B1
Authority
EP
European Patent Office
Prior art keywords
air
dishwasher
value
fan
humidity content
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 - Lifetime
Application number
EP03791535A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1551272A1 (en
Inventor
Mats Lilja
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.)
Asko Cylinda AB
Original Assignee
Asko Cylinda AB
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Filing date
Publication date
Application filed by Asko Cylinda AB filed Critical Asko Cylinda AB
Publication of EP1551272A1 publication Critical patent/EP1551272A1/en
Application granted granted Critical
Publication of EP1551272B1 publication Critical patent/EP1551272B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/42—Details
    • A47L15/48—Drying arrangements
    • A47L15/486—Blower arrangements
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/0018—Controlling processes, i.e. processes to control the operation of the machine characterised by the purpose or target of the control
    • A47L15/0021—Regulation of operational steps within the washing processes, e.g. optimisation or improvement of operational steps depending from the detergent nature or from the condition of the crockery
    • A47L15/0034—Drying phases, including dripping-off phases
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/42—Details
    • A47L15/4251—Details of the casing
    • A47L15/4257—Details of the loading door
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L2401/00—Automatic detection in controlling methods of washing or rinsing machines for crockery or tableware, e.g. information provided by sensors entered into controlling devices
    • A47L2401/19—Air humidity
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L2501/00—Output in controlling method of washing or rinsing machines for crockery or tableware, i.e. quantities or components controlled, or actions performed by the controlling device executing the controlling method
    • A47L2501/12—Air blowers
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L2501/00—Output in controlling method of washing or rinsing machines for crockery or tableware, i.e. quantities or components controlled, or actions performed by the controlling device executing the controlling method
    • A47L2501/30—Regulation of machine operational steps within the washing process, e.g. performing an additional rinsing phase, shortening or stopping of the drying phase, washing at decreased noise operation conditions

Definitions

  • the present invention relates to an adaptive method for drying heated dishes in a household dish washing machine by means of expulsion of damp air from the dish area.
  • the present invention also relates to a device which carries out said adaptive method.
  • a dishwasher operates automatically according to a predefined control program which, inter alia, controls the opening and closing of one or several inlet valves for the supply of water, and which also controls the circulation of this water with a dose added by the user in advance of some sort of detergent which is dissolved in the dishwasher for flushing cleaning of dishes which have been placed in the dishwasher.
  • the circulated water is either warm water which is supplied from a piping system, or alternatively, the supplied water is heated in the dishwasher.
  • a number of flushing processes take place in which old water is pumped out, following which new water is supplied and circulated.
  • US 5076306 describes a circulation system for the drying of an object in a dishwasher.
  • a fan drives air from an air intake to an air outlet.
  • the drying time is controlled, that is the time that the fan is to be operational, by a predefined value which is independent of the amount of dishes and the success of the drying process.
  • a fixed value of the time which the drying process is to be operational in most cases means that it is carried out during too long or too short a time. If it is carried out too short a time, the washed dishes will not be dry enough. If, on the other hand, the drying process is carried out during too long a time, there is an unnecessary energy consumption to operate said fan during a too protracted drying process. This also causes the total drying process to go on during an unnecessarily long time.
  • dishwashers have been equipped with one or several sensors, preferably of the humidity sensor or temperature sensor kind. These sensors continuously detect the development of the process, and at a certain stage of this development the drying process is interrupted, that is the fan is turned off.
  • the ventilation process is combined with drying by means of heating of the air by means of heating elements.
  • JP 10-258014 describes how a humidity sensor is used inside of a dishwasher.
  • the humidity content is detected as the time for a drying process elapses.
  • the drying process is carried out by means of a fan. Either the drying process is interrupted when the humidity content has reached a certain predetermined value, or when the change in humidity content over time planes out.
  • EP-A2-1127532 describes a dishwasher including a fan which takes moist air out of the tank through a removal duct and mixes it with dry ambient air taken in through an opening before discharging it through an outlet.
  • EP-A1-0521815 describes a dishwasher with a washing compartment which can be closed by means of an appliance door, a vent or the like for the dishwasher container in the appliance door which vent connects the washing compartment to the ambient air, and a mixing chamber for removal of the moist air from the washing compartment when the dishes are being dried, a separate fresh air duct opens out into the mixing chamber.
  • a main purpose of the present invention is to provide a method and a device for controlling a drying process in a household dishwasher, with the humidity content of the ambience taken into consideration.
  • an adaptive method which comprises the steps of initiating the expulsion of the humid air, detecting the ambient humidity content which results in a first value, storing this first value of the humidity content, and that the humidity content of the expelled air is detected, which expelled air continuously will have a lower and lower value of its humidity content.
  • the method finally comprises the step of interrupting the drying process when the value of the humidity content of the expelled air reaches a value which has a predetermined ratio to the stored first value of the ambient humidity content.
  • said household machine is a dishwasher.
  • a dishwasher 1 is equipped with means for drying the damp dishes in the washing area 2, which dishes immediately following the cleaning process are in a humid atmosphere.
  • the drying is, in brief, done by means of a fan 3 starting, which fan 3 expels the humid atmosphere out of the washing area 2, and transfers it to the ambient atmosphere via an air outlet 4.
  • ambient atmosphere is transferred to the washing area 2 via another opening (not shown), so that an exchange of air takes place which causes the humidity, which in the form of liquid is in contact with the dishes to evaporate, and be transferred to the ambient atmosphere.
  • a number of canals there is arranged, inter alia, a number of canals, and said fan 3 in a door 5 belonging to the dishwasher 1.
  • a first canal 6 leads from the ambient atmosphere to the fan 3
  • a second canal 7 leads from the washing area 2 of the dishwasher to the fan 3
  • a third canal 8 leads from the fan 3 to the ambient atmosphere via the air outlet 4.
  • a valve 9, the design of which will be described in more detail later, during the washing process blocks the passage between the second canal 7 and the fan 3, and thus also between the second canal 7 and the other two canals 6, 8.
  • the other canal 7 is in connection with the washing area 2 via an opening 10.
  • the valve 9 consists of a moveable element 11, which in its closed end position is biased by a spring 12 and blocks the passage of air between the second canal 7 and the fan 3.
  • the moveable element 11 is connected to a so-called wax engine 13, which is arranged to move the moveable element 11 from the closed end position against the spring force when it is biased with a suitable tension.
  • the voltage supply to the wax engine 13 is symbolized by a connection 14 which leads to a power supply 15 which in turn is connected to a control unit 16.
  • the connections between the power supply 15 and the control unit 16 are in the figures symbolized by a connection 17.
  • a resistor (not shown) comprised in the wax engine 13 develops heat when it is exposed to a voltage.
  • the open position remains as long as the wax is heated and thus is in an expanded state.
  • the resistor cools off, causing the amount of wax to return to its earlier contracted shape.
  • Said power transferring organ 19 then also returns, with the spring force causing also the moveable element 11 to return, causing the valve 9 to be closed.
  • An important detail in this context is that there is a certain time delay from the moment when the voltage is applied to the resistor until the wax has been heated and expanded so much that the valve 9 has been opened. In a corresponding manner, there is a delay from the removal of the voltage from the resistor until the wax has cooled off and contracted to a degree where the valve 9 is closed. In a preferred embodiment, this time delay is approximately 30 seconds.
  • said air intake 21 is shown to be arranged at the upper edge of the door 5, but this is merely an example of the placement of such an air intake and should not be seen as a limitation.
  • Such a capacitive humidity sensor is fed by means of direct current, and delivers an output signal within a certain frequency interval, where the frequency is proportional to the relative humidity content.
  • the humidity sensor 22 detects, preferably but not exclusively, a relative humidity content in the interval of 10%-95%. The rest of the function of the humidity sensor will not be described here.
  • connection to the humidity sensor 22 is symbolized by a connection 23 which leads to the control unit 16.
  • This humidity sensor 22 at this stage detects the humidity content which results in a humidity value, for example by means of a number of measured values being sampled and filtered.
  • This value in principle corresponds to the humidity content of the ambient atmosphere, since the humid air in the washing area 2 has not yet had access since the valve 9 is closed.
  • This first value is stored.
  • the wax engine 13 opens the valve 9 after said time delay, and the humid air in the washing area 2, led into the second canal 7 by means of the opening 10, is led further on through the second canal 7 to the fan 3 where it is mixed with the ambient atmosphere which is led to the fan 3 via the first canal 6.
  • the mixture of the humid air with the ambient atmosphere causes the amount of vapour of the humid air to decrease, which is desirable from a user's point of view.
  • the mixture is led further down through the third canal 8.
  • the third canal 8 opens into the air outlet 4, which preferably is placed at the lower edge of the door 5 where the mixed air which is blown out will not be noticed very much by the user. There, the blown-out air mixture is led out in such a manner that the exhaust is primarily horizontal (see in particular Fig. 2 ).
  • Another advantage of leading the expelled air mixture to the lower edge of the door 5 is that when said air mixture travels through the third canal 8, said air mixture is cooled, which further reduces the amount of steam.
  • the humidity sensor 22 After the detection by the humidity sensor 22 of the humidity content of the ambient atmosphere, it takes a certain time before it again starts to detect the humidity content, which will be described in more detail below. After a predetermined time, the humidity sensor 22 again begins to detect the humidity content. When the humidity content after a certain amount of time reaches a detected value which has a certain predetermined relationship to the first stored value, the drying process is interrupted.
  • the drying process functions in an adaptive manner since it is adapted to the current surrounding humidity content at the time in question.
  • the drying process is schematically shown in Fig. 3 .
  • a value is obtained of the humidity content of the ambient atmosphere F 0 .
  • the humidity sensor again begins to detect the humidity content.
  • the drying process is interrupted.
  • This relationship can for example be such that the first stored value F 0 is divided by a predetermined factor.
  • This factor is in a particularly preferred embodiment 0,97 but can of course be chosen to another value if this is deemed to be advantageous. It is in this context important that the earlier mentioned predetermined time t 1 when the humidity sensor again begins to determine the humidity content after the first value having been detected and stored is chosen so that the time t 2 when the humidity content reaches the detected value F 2 is not mistaken for the time t 3 at the beginning of the drying process, when the value F 2 of the humidity content is passed.
  • the value F 2 of the humidity content can, in the beginning of the drying process, be passed a number a times since the humidity content can fluctuate somewhat (not shown).
  • the drying process is carried out by means of a time control which guarantees a certain minimal drying time.
  • This time control in addition controls the drying process so that it does not go on longer than a certain predefined amount of time.
  • valve is not necessary for the invention.
  • humidity sensor 22 does not need to be of the capacitive kind but other kinds of humidity sensors can also be used.
  • the invention is not limited to the application of dishwashers but can generally be applied to household machines where dishes are dried.

Landscapes

  • Washing And Drying Of Tableware (AREA)
  • Drying Of Solid Materials (AREA)
  • Detergent Compositions (AREA)
EP03791535A 2002-08-30 2003-08-29 A method for drying washed dishes, and a device for its implementation Expired - Lifetime EP1551272B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE0202576A SE524404C2 (sv) 2002-08-30 2002-08-30 Förfarande för torkning av diskgods och anordning för dess genomförande
SE0202576 2002-08-30
PCT/SE2003/001345 WO2004019750A1 (en) 2002-08-30 2003-08-29 A method for drying washed dishes, and a device for its implementation

Publications (2)

Publication Number Publication Date
EP1551272A1 EP1551272A1 (en) 2005-07-13
EP1551272B1 true EP1551272B1 (en) 2012-02-29

Family

ID=20288854

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03791535A Expired - Lifetime EP1551272B1 (en) 2002-08-30 2003-08-29 A method for drying washed dishes, and a device for its implementation

Country Status (6)

Country Link
EP (1) EP1551272B1 (sv)
AT (1) ATE547040T1 (sv)
AU (1) AU2003253562A1 (sv)
DK (1) DK1551272T3 (sv)
SE (1) SE524404C2 (sv)
WO (1) WO2004019750A1 (sv)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI556782B (zh) * 2015-01-29 2016-11-11 Yi-Ting Liao The installation method and assembly of the oven door

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9895044B2 (en) 2012-08-28 2018-02-20 Whirlpool Corporation Dishwasher with controlled dry cycle
CN104586337A (zh) * 2013-10-31 2015-05-06 美的集团股份有限公司 一种洗碗机及其洗涤烘干控制方法和系统
CN207949765U (zh) * 2017-07-21 2018-10-12 佛山市顺德区美的洗涤电器制造有限公司 风机装置及洗碗机
EP3440983B1 (de) * 2017-08-10 2020-11-25 MELAG Medizintechnik GmbH & Co. KG Verfahren zur steuerung der dauer einer trocknungsphase eines reinigungsverfahrens und dafür geeignetes gerät
EP3841949A1 (en) * 2019-12-26 2021-06-30 Arçelik Anonim Sirketi A dishwasher with a humidity sensor
CN113425211A (zh) * 2020-03-23 2021-09-24 松下电器产业株式会社 干燥机、控制装置以及控制方法
CN114601406A (zh) * 2022-04-25 2022-06-10 珠海格力电器股份有限公司 一种洗碗机干燥保存方法、装置及洗碗机

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE505058C2 (sv) 1988-11-16 1997-06-16 Sanyo Electric Co Diskmaskin med torkare innefattande tvåsidig roterande fläkt
DE4221182A1 (de) 1991-07-02 1993-01-07 Miele & Cie Geschirrspuelmaschine mit einer den spuelraum mit der umgebungsluft verbindenden entlueftungsoeffnung oder dergleichen
JP3429424B2 (ja) 1997-03-19 2003-07-22 リンナイ株式会社 食器洗浄器
IT1316791B1 (it) 2000-02-25 2003-05-12 Bonferraro Spa Lavastoviglie con ciclo di asciugatura regolabile

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI556782B (zh) * 2015-01-29 2016-11-11 Yi-Ting Liao The installation method and assembly of the oven door

Also Published As

Publication number Publication date
AU2003253562A1 (en) 2004-03-19
WO2004019750A1 (en) 2004-03-11
DK1551272T3 (da) 2012-05-14
ATE547040T1 (de) 2012-03-15
SE524404C2 (sv) 2004-08-03
EP1551272A1 (en) 2005-07-13
SE0202576L (sv) 2004-03-01
SE0202576D0 (sv) 2002-08-30

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