EP2848180A1 - Lave-vaisselle équipé d'une paroi de cuve réfrigérée - Google Patents

Lave-vaisselle équipé d'une paroi de cuve réfrigérée Download PDF

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Publication number
EP2848180A1
EP2848180A1 EP20140001765 EP14001765A EP2848180A1 EP 2848180 A1 EP2848180 A1 EP 2848180A1 EP 20140001765 EP20140001765 EP 20140001765 EP 14001765 A EP14001765 A EP 14001765A EP 2848180 A1 EP2848180 A1 EP 2848180A1
Authority
EP
European Patent Office
Prior art keywords
wall
tub
cooling device
temperature
drying phase
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
EP20140001765
Other languages
German (de)
English (en)
Other versions
EP2848180B1 (fr
Inventor
Albert Johann Loichinger
Ingo Gau
Ernst Dober
Stefan Flück
Dustin Becker
Marcel Quadrelli
Beat Wellig
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.)
V-Zug AG
Original Assignee
V-Zug AG
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 V-Zug AG filed Critical V-Zug AG
Priority to EP14001765.8A priority Critical patent/EP2848180B1/fr
Priority to DK14001765.8T priority patent/DK2848180T3/en
Priority to PL14001765.8T priority patent/PL2848180T3/pl
Priority to SI201430045A priority patent/SI2848180T1/sl
Publication of EP2848180A1 publication Critical patent/EP2848180A1/fr
Application granted granted Critical
Publication of EP2848180B1 publication Critical patent/EP2848180B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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    • 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
    • A47L15/483—Drying arrangements by using condensers

Definitions

  • the invention relates to a dishwasher with a tub for receiving dishes, with a cooling device for cooling at least one wall of the tub and with a controller for controlling the cleaning process.
  • the invention also relates to a method for operating such a dishwasher.
  • the cleaning process comprises an actual cleaning phase in which the dishes are cleaned in one or (usually) several washing cycles with process water, partly with the addition of cleaning agents. Furthermore, the cleaning process comprises a drying phase in which the dishes are dried.
  • the controller heats up the tub and in particular the washware contained therein, usually by the process water is heated in the rinse cycle to a relatively high temperature, for example 50-60 ° C. Then begins the drying phase, in which a cooling device, for example in the form of a blower is activated to at least one wall of the tub or an exchange surface with the tub air to cool.
  • a cooling device for example in the form of a blower is activated to at least one wall of the tub or an exchange surface with the tub air to cool.
  • control of the dishwasher is configured to control the cooling device in the drying phase such that the center temperature of the tub is between 3 ° and 10 ° C above the temperature of the cooled wall.
  • center temperature of the tub is to be understood as the temperature which the process air in the middle of the tub assumes.
  • the invention is based on the finding that in conventional processes at least over part of the drying process mist is formed in the region of the cooled wall, ie the air spontaneously condenses into suspended droplets.
  • This mist formation represents a less efficient drying process than the direct condensation on the tub wall, along which the water can flow.
  • the mist can rewet the dishes and thus counteract the drying process.
  • condensed droplets significantly hinder the exchange process caused by diffusion or convection. It can be seen that the formation of mist can be at least largely avoided if the temperature difference between the middle of the Vat and the wall is limited to about 10 °. However, the temperature difference should be at least 1 °, otherwise the drying rate drops.
  • control for maintaining the desired temperature difference is preferably configured to increase the cooling performance of the cooling device in several steps or continuously during the drying phase.
  • the cooling device has a control loop to control the temperature of the wall to a desired value.
  • This control loop may be at least partially implemented in the software of the controller.
  • the controller is configured to lower the setpoint in the drying phase in several steps or continuously. In this way, regardless of the efficiency of the cooling device (which may be dependent on the ambient temperature, for example), it can be well ensured that the temperature difference remains within the desired range.
  • the invention is particularly suitable for dishwashers in which no means for actively circulating air in the tub are provided. Under active circulation is thereby a circulation by mechanical means, such. Fans and blowers, as opposed to a passive circulation due to convection effects.
  • the problem of fog formation is particularly prominent in devices in which the air is passively circulated and thus the moisture transport in the air based on free convection and diffusion.
  • the invention also relates to a method for operating a dishwasher with a tub for receiving dishes and with a cooling device for cooling at least one wall of the tub.
  • a cleaning process comprising a cleaning phase and a drying phase, wherein in the drying phase, the wall of the tub is cooled with the cooling device.
  • the cooling device is controlled such that the center temperature of the tub is between 1 ° and 10 °, in particular 2 ° - 6 ° C, above the temperature of the wall.
  • the dishwasher according to Fig. 1 has a tub 1 for receiving the dishes.
  • a tub 1 for receiving the dishes.
  • crockery baskets, spray arms and other means for receiving and cleaning the dishes are provided in a conventional manner. These components are not central in the present context and therefore not shown in the figure.
  • the apparatus further has a cooling device 3 for cooling at least one wall of the tub 1, in the present example for cooling the door 2 opposite the rear wall 4.
  • the cooling device is configured in the present example as a fan that sucks ambient air from the base portion of the front of the device. The air thus conveyed passes along the rear wall 4 and is then blown out through the front of the appliance via the tub. Thus, the fan is configured to cool the wall 4 by means of ambient air.
  • controller 5 which controls the operation of the components of the device according to user inputs.
  • the controller 5 is a process controller which is designed to carry out the process steps described here.
  • the device continues to have (in Fig. 1 not shown) in a conventional manner, a water-carrying system comprising a fresh water supply for supplying fresh water, a water circulation system to convey water from the sump of the tub in the spray devices, and a system for discharging spent water into the sewer.
  • Heating means are attached to the water circulation system and / or the tub to heat the process water.
  • a detergent addition allows the controlled, process-controlled addition of washing reagents, such as dishwashing or Glanzmaschineer.
  • FIG. 1 two further (optional) temperature sensors are shown.
  • a wall temperature sensor 6 is used to measure the temperature of the rear wall 4.
  • a control temperature sensor 7 is spaced from the wall 4, preferably at a distance of at least 10 cm, and also measures the temperature at or in the tub 1. The objects of these sensors will be discussed below described in more detail.
  • the controller 5 controls the components of the device according to a user-selected cleaning program. At least one of the selectable cleaning programs is designed to carry out a cleaning process in accordance with the procedure described below.
  • the controller 5 supplies process water to the tub 1 to clean the dishes.
  • This phase may include several process water cycles, e.g. a pre-wash without dishwashing detergent and a main wash with the addition of dishwashing detergent. There may also be provided further process water cycles with or without the addition of dishwashing detergent.
  • the process water can optionally be heated, typically at temperatures between 40 and 50 ° C. Between process water cycles, the process water is partially or completely discharged and replaced with new water.
  • the cooling device 3 preferably remains switched off.
  • the end of the cleaning phase is formed by a rinse cycle, in which the tub 1 fresh process water and rinse aid are supplied.
  • the water is heated to a relatively high temperature of about 50-60 ° C so as to supply heat to the tub 1 and in particular the dishes. Thereafter, the water is drained.
  • Fig. 2 shows in the upper diagram the course of the center temperature (solid line) and the wall temperature (dotted line), and in the lower diagram the cooler performance (ie, the electric power supplied to the cooling device).
  • the cooling device 3 can (optionally) initially be operated with a relatively high cooling capacity, to rapidly lower the temperature of the wall 4 by 1-10 ° C below the center temperature. Then, the cooling device is operated in the drying phase from time t1 so that the wall temperature is set in the range of 1 - 10 ° C below the center temperature. Since during the drying phase, the center temperature in the tub continuously decreases, the cooling of the wall 4 must be increasingly strong, as shown in the lower diagram of Fig. 2 is shown to maintain the desired temperature difference.
  • Fig. 2 is shown a continuous increase in the cooling capacity from time t1. However, this increase can also take place in several discontinuous steps.
  • Cooling power is to be understood as the power averaged over a period of a few minutes, in particular of at most 5 minutes, which power is supplied to the cooling device 3.
  • the cooling may be e.g. also in the form of short "cooling pulses” of e.g. for a few seconds, increasing the intensity or length of the cooling pulses over time.
  • drying phase in the sense of the claims is the in Fig. 2 between t1 and t2, in which the cooling capacity increases in several steps or continuously and the temperature of the wall is lower than the center temperature by the said difference.
  • the length of this drying phase is at least 10 minutes, in particular at least 20 minutes.
  • the cooling capacity is preferably increased by at least 50% in order to take account of the cooling of the bottom temperature.
  • the invention is based on the idea that the air on the cooled wall 4 is not too supersaturated.
  • the quantity ⁇ which corresponds to the ratio between the partial pressure of water vapor in the gas and the vapor pressure at a given temperature, is preferably between 1.04 and 1.05, which (depending on the absolute temperature and as described above) as a certain temperature difference between wall and center temperature can be expressed.
  • a wall temperature sensor 6 is provided, by means of which the temperature of the wall 4 can be controlled.
  • the cooling device 3, the controller 5 and the temperature sensor 6 form a control loop, with which the temperature of the wall 4 is adjusted to a desired value.
  • the controller 5 is designed to lower this setpoint in the drying phase continuously or in several steps.
  • the setpoint is preferably reduced by at least 10 ° C, in particular at least 20 ° C, so as to take into account the corresponding reduction of the center temperature, which is also at least 10 ° C, in particular at least 20 ° C.
  • a control temperature sensor 7 may be provided with which the temperature at or in the tub 1 at a distance from the cooled wall can be measured.
  • the signal of such a sensor is a measure of the center temperature of the tub 1, so that it can be pulled up for better control of the cooling device 3 zoom.
  • the controller 5 may be configured to control the radiator output depending on the difference of the temperatures on the wall 4 and the control temperature sensor 7 - the smaller this temperature difference is, the bigger the cooler performance has to be.
  • the setpoint temperature for the wall 4 is reduced in the drying phase according to a determined by the device manufacturer target profile. This desired course is e.g. determined in the manufacturer's experiments so that the desired temperature difference for conventional loads and process parameters is maintained.
  • the wall temperature sensor 6 can be dispensed with.
  • the cooling capacity is increased stepwise or continuously in accordance with a desired course determined by the device manufacturer. This nominal course is also used e.g. determined in the manufacturer's experiments so that the desired temperature difference for conventional loads and process parameters is maintained.
  • the drying time and / or the temperature of the rinse cycle can be reduced compared to conventional devices with a constant drying result.
EP14001765.8A 2014-05-20 2014-05-20 Lave-vaisselle équipé d'une paroi de cuve réfrigérée Active EP2848180B1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP14001765.8A EP2848180B1 (fr) 2014-05-20 2014-05-20 Lave-vaisselle équipé d'une paroi de cuve réfrigérée
DK14001765.8T DK2848180T3 (en) 2014-05-20 2014-05-20 Dishwasher with the cooled vessel wall
PL14001765.8T PL2848180T3 (pl) 2014-05-20 2014-05-20 Zmywarka do naczyń z chłodzoną ścianą zbiornika
SI201430045A SI2848180T1 (sl) 2014-05-20 2014-05-20 Pomivalni stroj s hlajeno steno kadice

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP14001765.8A EP2848180B1 (fr) 2014-05-20 2014-05-20 Lave-vaisselle équipé d'une paroi de cuve réfrigérée

Publications (2)

Publication Number Publication Date
EP2848180A1 true EP2848180A1 (fr) 2015-03-18
EP2848180B1 EP2848180B1 (fr) 2016-05-25

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ID=50842002

Family Applications (1)

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EP14001765.8A Active EP2848180B1 (fr) 2014-05-20 2014-05-20 Lave-vaisselle équipé d'une paroi de cuve réfrigérée

Country Status (4)

Country Link
EP (1) EP2848180B1 (fr)
DK (1) DK2848180T3 (fr)
PL (1) PL2848180T3 (fr)
SI (1) SI2848180T1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108697296A (zh) * 2015-10-21 2018-10-23 伊利诺斯工具制品有限公司 器皿清洗机器干燥系统和方法
CN108771526A (zh) * 2018-05-31 2018-11-09 佛山市顺德区美的洗涤电器制造有限公司 洗涤方法、洗碗机及计算机可读存储介质

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3941226A1 (de) * 1988-09-15 1991-06-20 Licentia Gmbh Geschirrspuelmaschine mit einem kuehlmittelkanal
WO2006029953A1 (fr) * 2004-09-13 2006-03-23 BSH Bosch und Siemens Hausgeräte GmbH Procédé de séchage pour un appareil électroménager et appareil électroménager permettant la mise en oeuvre dudit procédé
WO2006069834A1 (fr) * 2004-12-27 2006-07-06 BSH Bosch und Siemens Hausgeräte GmbH Lave-vaisselle comprenant un dispositif de sechage
DE102007059517A1 (de) * 2007-12-11 2009-06-18 BSH Bosch und Siemens Hausgeräte GmbH Verfahren zur Erfassung einer beladungsbedingten Wärmekapazitätsänderung eines wasserführenden Haushaltsgeräts
CN100531664C (zh) * 2005-11-14 2009-08-26 乐金电子(天津)电器有限公司 洗碗机的凝聚装置
WO2010142569A1 (fr) * 2009-06-10 2010-12-16 BSH Bosch und Siemens Hausgeräte GmbH Lave-vaisselle doté d'un échangeur thermique et procédé de commande associé

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3941226A1 (de) * 1988-09-15 1991-06-20 Licentia Gmbh Geschirrspuelmaschine mit einem kuehlmittelkanal
WO2006029953A1 (fr) * 2004-09-13 2006-03-23 BSH Bosch und Siemens Hausgeräte GmbH Procédé de séchage pour un appareil électroménager et appareil électroménager permettant la mise en oeuvre dudit procédé
WO2006069834A1 (fr) * 2004-12-27 2006-07-06 BSH Bosch und Siemens Hausgeräte GmbH Lave-vaisselle comprenant un dispositif de sechage
CN100531664C (zh) * 2005-11-14 2009-08-26 乐金电子(天津)电器有限公司 洗碗机的凝聚装置
DE102007059517A1 (de) * 2007-12-11 2009-06-18 BSH Bosch und Siemens Hausgeräte GmbH Verfahren zur Erfassung einer beladungsbedingten Wärmekapazitätsänderung eines wasserführenden Haushaltsgeräts
WO2010142569A1 (fr) * 2009-06-10 2010-12-16 BSH Bosch und Siemens Hausgeräte GmbH Lave-vaisselle doté d'un échangeur thermique et procédé de commande associé

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108697296A (zh) * 2015-10-21 2018-10-23 伊利诺斯工具制品有限公司 器皿清洗机器干燥系统和方法
CN108771526A (zh) * 2018-05-31 2018-11-09 佛山市顺德区美的洗涤电器制造有限公司 洗涤方法、洗碗机及计算机可读存储介质
CN108771526B (zh) * 2018-05-31 2021-03-19 佛山市顺德区美的洗涤电器制造有限公司 洗涤方法、洗碗机及计算机可读存储介质

Also Published As

Publication number Publication date
EP2848180B1 (fr) 2016-05-25
SI2848180T1 (sl) 2016-09-30
PL2848180T3 (pl) 2016-11-30
DK2848180T3 (en) 2016-08-22

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