EP2611348B1 - Dishwasher and method for operating a dishwasher - Google Patents
Dishwasher and method for operating a dishwasher Download PDFInfo
- Publication number
- EP2611348B1 EP2611348B1 EP11752539.4A EP11752539A EP2611348B1 EP 2611348 B1 EP2611348 B1 EP 2611348B1 EP 11752539 A EP11752539 A EP 11752539A EP 2611348 B1 EP2611348 B1 EP 2611348B1
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- EP
- European Patent Office
- Prior art keywords
- temperature
- washing liquid
- washing
- spray arm
- liquid
- Prior art date
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- 238000000034 method Methods 0.000 title claims description 12
- 238000005406 washing Methods 0.000 claims description 185
- 239000007788 liquid Substances 0.000 claims description 160
- 239000007921 spray Substances 0.000 claims description 62
- 238000010438 heat treatment Methods 0.000 claims description 23
- 239000003599 detergent Substances 0.000 claims description 14
- 102000004190 Enzymes Human genes 0.000 claims description 6
- 108090000790 Enzymes Proteins 0.000 claims description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000004140 cleaning Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 1
- 238000004851 dishwashing Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000011017 operating method Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
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
- A47L15/0002—Washing processes, i.e. machine working principles characterised by phases or operational steps
-
- 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
- A47L15/0049—Detection or prevention of malfunction, including accident prevention
-
- 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
- A47L2401/12—Water temperature
-
- 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
- A47L2501/04—Water pressure or flow rate
-
- 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
- A47L2501/05—Drain or recirculation pump, e.g. regulation of the pump rotational speed or flow direction
-
- 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
- A47L2501/20—Spray nozzles or spray arms
Definitions
- the present invention relates to a dishwasher and a method for operating a dishwasher.
- EP 1 132 038 B1 describes a household dishwashing machine comprising a control system, a washing chamber, wherein at least a first and a second basket are housed, for containing the crockery to be washed, a hydraulic circuit, comprising at least a first and a second liquid sprayer, a pump, a first supply branch for said first sprayer and a second supply branch for said second sprayer, where in order to wash the crockery said pump provides for forcing liquid from the bottom of said tub into said supply branches, for causing a respective liquid flow to exit from each of said sprayers, detergent spraying means, liquid heating means, adjusting means of the amount of liquid forced by said pump into said supply branches, a manually operable selecting means, for selecting the type of crockery contained in said first basket and in said second basket, said selecting means being connected with said control system with information being indicative of the type of crockery contained in said first basket and in said second basket, the control means which, at least during a phase of an operating cycle of the machine, controls
- EP 2 156 776 discloses a dishwasher and controlling method of the same.
- EP 2 201 884 discloses a method for preventing kitchenware articles from breaking during washing in a dishwasher.
- An object of the present invention is to provide a dishwasher and a method for operating a dishwasher which can be charged with heavy duty dishes and delicate dishes at the same washing cycle and which provides an acceptable cleaning result as well as convenient operation by a user.
- a dishwasher comprises a washing chamber in which at least one upper basket and at least one lower basket for receiving the washing load are or can be arranged, wherein the upper basket can receive more delicate washing load and the lower basket can receive more stable washing load, further comprising a washing liquid circulation system distributing washing liquid within the washing chamber by means of an upper spray arm and a lower spray arm and having at least one pump for supplying washing liquid to both spray arms and further comprising liquid heating means for heating the washing liquid, such that the washing liquid can be heated up at least to a first temperature T 1 and subsequently to a second temperature T 2 , wherein the first temperature T 1 is lower than the second temperature T 2 , and wherein the supply of the washing liquid to the upper spray arm is stopped by the washing liquid circulation system when the washing liquid temperature exceeds the first temperature T 1 and is not continued before the washing liquid temperature falls upon or below the first temperature T 1 , while the lower spray arm is still continued being supplied with washing liquid, and wherein the pump speed of the at least one pump is reduced during heating up the washing liquid from the first
- At least one upper spray arm and at least one lower spray arm each of which being substantially related to one of the respective baskets are provided.
- Such an arrangement allows to treat washing load differently depending whether it is arranged in the upper basket or in the lower basket.
- a measuring system measures the liquid temperature within the sump and transfers the measured value to a control system of the dishwasher.
- the object of the invention can be solved by a method for operating a dishwasher according to the present invention wherein the dishwasher comprises a washing chamber in which at least one upper basket and at least one lower basket for receiving the washing load are or can be arranged, wherein the upper basket can receive more delicate washing load and the lower basket can receive more stable washing load, wherein the washing liquid is distributed within the washing chamber by means of an upper spray arm and a lower spray arm and wherein the washing liquid is supplied to both spray arms by means of at least one pump comprising the following steps:
- the delicate washing load in the upper basket is treated carefully with regards to the high temperature of the washing liquid and to the aggressive combination of detergent and hot washing liquid. Further by reducing the pump speed of the at least one pump, the increasing of the temperature of the wash load in the upper basket can be minimized.
- At least one upper spray arm and at least one lower spray arm each of which being substantially related to one of the respective baskets are provided.
- Such an arrangement allows to treat washing load differently depending whether it is arranged in the upper basket or in the lower basket.
- the washing liquid is heated up to at least the first temperature T 1 in a first phase which is a main washing phase and to the second temperature T 2 in a second phase which is a rinse phase ; and/or the main washing phase comprises the steps
- the temperature of the washing load in the upper basket increases similarly as in the lower basket when the supply of the washing liquid to the upper spray arm is stopped.
- the temperature of the washing liquid is reduced by substituting hot washing liquid with fresh liquid which allows to treat the delicate washing load more softly.
- the temperatures of the washing liquid are adapted to the respective detergent.
- the wash load in the upper basket is treated carefully with regards to the high temperature of the washing liquid and to the aggressive combination of detergent and hot washing liquid. Direct contact of washing liquid and delicate washing load is prevented in the case that the washing liquid comprises very high temperatures or temperatures effecting aggressive to the surfaces of the delicate washing load.
- the temperature range of 45°C to 50°C is adapted to the activity of the enzyme component of the detergent.
- the second temperature of 65°C or higher is adapted for cleaning heavy duty dishes which are arranged in the lower basket.
- a measuring system measures the liquid temperature within the sump and transfers the measured value to a control system of the dishwasher.
- a dishwasher comprises a washing chamber wherein usually an upper basket and a lower basket for receiving the washing load are arranged and an upper spray arm and a lower spray arm are provided each one being related to one of the respective baskets, wherein washing liquid circulates within the dishwasher and wherein the washing liquid is distributed within the washing chamber by means of the spray arms and wherein the washing liquid is supplied to both spray arms by means of at least one pump and wherein liquid heating means are provided for heating the washing liquid.
- the upper basket is provided for being loaded with more delicate washing load, e.g. glasses, wherein the lower basket is provided for more stable washing load, e.g. pots or plates.
- Delicate means in particular the vulnerability of the surface of the dishes.
- the circulation of the washing liquid usually comprises a sump in a bottom region of the dishwasher, wherein the washing liquid is collected coming from the washing chamber.
- a pump is arranged in or adjacent to the sump for circulating the washing liquid within the dishwasher or, more precisely, within the circulation system of the dishwasher. Further means for discharging washing liquid from the circulation system and means for feeding the circulation system with fresh liquid are provided.
- the temperature of the washing liquid might be measured within the sump or on alternative applicable positions, e.g. the spray arms or within the pump. Further the distribution of the washing liquid can be controlled in such a way, that both spray arms can be supplied with washing liquid at the same time, or only one of the spray arm.
- the liquid heating means and the circulation system of the dishwasher as well as the means for discharging, the means for feeding and distributing the washing liquid can be controlled by a control system.
- Commands to the control system can be given by a software implemented to a microcontroller connected to the control system or also from a hardware adapted to control the control system or by a user or a maintenance technician.
- the control system can control the dishwasher in such way that it is able to perform a method according to Fig. 1 .
- the diagram shows the characteristics "washing liquid temperature” and “washing liquid distribution” over a time line and how the two characteristics correlate with each other.
- the diagram shows the temperature of the washing liquid as measured within the sump and the periods when both spray arms or only one of the spray arms is supplied with washing liquid.
- the time line is subdivided in several washing phases.
- Phase 1 is a pre-wash phase
- phase 2 is a main wash phase
- phase 3 is a cold rinse phase
- phase 4 is a hot rinse phase
- phase 5 is a drying phase.
- phase 2 which is the main wash phase
- the washing liquid is provided with a detergent, wherein the detergent comprises an enzyme component.
- the washing liquid is heated up to a temperature that is adapted for the use of the detergent, in particular to a first temperature T 1 which enables the enzyme component to be active without being destroyed by a higher temperature.
- a first temperature T 1 is between 45°C and 50°C, preferedly close to or exactly 50°C.
- the washing liquid is kept on the first temperature T 1 without further heating up to allow sufficient duration of the enzyme component being active.
- this treatment it is possible to supply washing liquid to both spray arms or only to the upper spray arm to ensure that the washing load in the upper basket is washed sufficiently during phase 2.
- the washing liquid is heated up to a second temperature T 2 which can be 65°C or higher.
- T 2 which can be 65°C or higher.
- the washing liquid temperature reaches the second temperature T 2 , a part of the washing liquid is drained from the circulation system and substituted with fresh liquid. Thus, the washing liquid temperature is reduced. Phase 2 is continued and terminated with the washing liquid of reduced temperature, wherein the supply of the washing liquid to the upper spray arm remains stopped.
- the pump speed can be reduced during heating up the washing liquid from the first temperature T 1 to the second temperature T 2 .
- phase 3 and/or phase 4 which form together a rinse phase
- the washing liquid temperature is heated up from a first temperature T 1 to a second temperature T 2 , in particular during phase 4 which is a hot rinse phase.
- the supply of washing liquid to the upper spray arm is stopped when the washing liquid temperature exceeds the first temperature T 1 .
- rinse aid is added to the washing liquid and during phase 3 a part of the washing liquid is substituted with fresh liquid.
- the washing liquid temperature during phase 3 does not exceed the first temperature T 1 and therefore the washing liquid is supplied to upper spray arm and the lower spray arm.
- the washing liquid is drained and replaced with fresh liquid.
- phase 4 the washing liquid is heated up, wherein the first temperature T 1 is exceeded and therefore the supply of washing liquid to the upper spray arm is stopped.
- the washing liquid is heated up to the second temperature T 2 .
- phase 5 which is a drying phase, is started.
- Fig. 1 the diagram illustrates a division of the characteristics "washing liquid temperature” and "washing liquid distribution" in sections A to E.
- section A washing liquid is supplied to the upper spray arm and the lower spray arm, the distribution of the washing liquid is to both at the same time or only one at a time changing after a certain time, wherein the washing liquid temperature is low and the pressure with which the washing liquid is distributed by the spray arms is also low.
- section B the supply of washing liquid to the upper spray arm is stopped. Only the lower spray arm receives washing liquid. The washing liquid temperature is high and the washing liquid pressure is also high.
- section C as in section A, the washing liquid is supplied to the upper spray arm and the lower spray arm, wherein the washing liquid temperature is low and the pressure with which the washing liquid is distributed by the spray arms is also low.
- section D the supply of washing liquid to the upper spray arm is stopped, wherein the washing liquid temperature is high and the washing liquid pressure is low.
- section E the circulation of the washing liquid is stopped completely.
- a preferred ratio of pressures to be provided in the upper and the lower spray arm is shown in the following table. Section Sprayarm pressure Upper Lower A ⁇ 70 200 B 0 200 C ⁇ 70 ⁇ 140 D 0 110
Landscapes
- Washing And Drying Of Tableware (AREA)
Description
- The present invention relates to a dishwasher and a method for operating a dishwasher.
-
EP 1 132 038 B1 -
EP 2 156 776 -
EP 2 201 884 - From dishwashers described in the prior art it is known to provide manually selecting means for the user to determine which kind of washing load is loaded to which basket which is inconvenient and complicated for a user. Further dishwashers are known in the prior art wherein the user has to decide to charge the dishwasher with heavy duty dishes or delicate dishes.
- An object of the present invention is to provide a dishwasher and a method for operating a dishwasher which can be charged with heavy duty dishes and delicate dishes at the same washing cycle and which provides an acceptable cleaning result as well as convenient operation by a user.
- A solution of this object according to the invention is defined and characterized by
independent claims - A dishwasher according to the present invention comprises a washing chamber in which at least one upper basket and at least one lower basket for receiving the washing load are or can be arranged, wherein the upper basket can receive more delicate washing load and the lower basket can receive more stable washing load, further comprising a washing liquid circulation system distributing washing liquid within the washing chamber by means of an upper spray arm and a lower spray arm and having at least one pump for supplying washing liquid to both spray arms and further comprising liquid heating means for heating the washing liquid, such that the washing liquid can be heated up at least to a first temperature T1 and subsequently to a second temperature T2, wherein the first temperature T1 is lower than the second temperature T2, and wherein the supply of the washing liquid to the upper spray arm is stopped by the washing liquid circulation system when the washing liquid temperature exceeds the first temperature T1 and is not continued before the washing liquid temperature falls upon or below the first temperature T1, while the lower spray arm is still continued being supplied with washing liquid, and wherein the pump speed of the at least one pump is reduced during heating up the washing liquid from the first temperature T1 to the second temperature T2.
- In such a dishwasher delicate washing load such as glasses which can be arranged in the upper basket and is treated carefully or softly regarding higher temperatures of the washing liquid. It was found out, that the temperature of the wash load in the upper basket can increase even when only the lower spray arm re-ceives washing liquid. Thus, the wash load in the upper basket suffers a higher temperature load which may lead to damages of the wash load. The reduction of the pump speed during the heating up of the washing liquid leads to the effect that the wash load in the upper basket is heated up less and/or is heated up slower, either or both of which means a softer treatment of the wash load.
- According to a further embodiment of the invention in the washing chamber at least one upper spray arm and at least one lower spray arm each of which being substantially related to one of the respective baskets are provided.
- Such an arrangement allows to treat washing load differently depending whether it is arranged in the upper basket or in the lower basket.
- In a further embodiment of the invention a measuring system measures the liquid temperature within the sump and transfers the measured value to a control system of the dishwasher.
- Thus, an easy and secure way of measuring the liquid temperature is received.
- Further the object of the invention can be solved by a method for operating a dishwasher according to the present invention wherein the dishwasher comprises a washing chamber in which at least one upper basket and at least one lower basket for receiving the washing load are or can be arranged, wherein the upper basket can receive more delicate washing load and the lower basket can receive more stable washing load, wherein the washing liquid is distributed within the washing chamber by means of an upper spray arm and a lower spray arm and wherein the washing liquid is supplied to both spray arms by means of at least one pump comprising the following steps:
- heating up the washing liquid at least to a first temperature T1 and subsequently to a second temperature T2, wherein the first temperature T1 is lower than the second temperature T2;
- stopping the supply of the washing liquid to the upper spray arm when the washing liquid temperature exceeds the first temperature T1 until the washing liquid temperature falls upon or below the first temperature T1 while the lower spray arm is still continued being supplied with washing liquid;
- reducing the pump speed of the at least one pump during heating up the washing liquid from the first temperature T1 to the second temperature T2 .
- By means of the inventive method the delicate washing load in the upper basket is treated carefully with regards to the high temperature of the washing liquid and to the aggressive combination of detergent and hot washing liquid. Further by reducing the pump speed of the at least one pump, the increasing of the temperature of the wash load in the upper basket can be minimized.
- According to a further embodiment of the invention in the washing chamber at least one upper spray arm and at least one lower spray arm each of which being substantially related to one of the respective baskets are provided.
- Such an arrangement allows to treat washing load differently depending whether it is arranged in the upper basket or in the lower basket.
- According to a further embodiment of the invention the washing liquid is heated up to at least the first temperature T1 in a first phase which is a main washing phase and to the second temperature T2 in a second phase which is a rinse phase ; and/or the main washing phase comprises the steps
- heating up the washing liquid comprising a detergent to a first temperature T1 which is adapted to the detergent, in particular to an enzyme component of the detergent;
- keeping the first temperature T1 for a defined period;
- heating up the washing liquid to the second temperature T2, wherein supply of the washing liquid to the upper spray arm is stopped as soon as the washing liquid temperature exceeds the first temperature T1; and/or the rinse phase comprises the steps
- adding rinse aid to the washing liquid;
- heating up the washing liquid to the second temperature T2 or beyond, wherein supply of the washing liquid to the upper spray arm is stopped as soon as the washing liquid temperature exceeds the first temperature T1;
- Thus, it is allowed to wash washing load in the upper basket more softly than in the lower basket. Surprisingly it was found, that the temperature of the washing load in the upper basket increases similarly as in the lower basket when the supply of the washing liquid to the upper spray arm is stopped. Thus, the temperature of the washing liquid is reduced by substituting hot washing liquid with fresh liquid which allows to treat the delicate washing load more softly. The temperatures of the washing liquid are adapted to the respective detergent. The wash load in the upper basket is treated carefully with regards to the high temperature of the washing liquid and to the aggressive combination of detergent and hot washing liquid. Direct contact of washing liquid and delicate washing load is prevented in the case that the washing liquid comprises very high temperatures or temperatures effecting aggressive to the surfaces of the delicate washing load. The temperature range of 45°C to 50°C is adapted to the activity of the enzyme component of the detergent. The second temperature of 65°C or higher is adapted for cleaning heavy duty dishes which are arranged in the lower basket.
- In a further embodiment of the invention a measuring system measures the liquid temperature within the sump and transfers the measured value to a control system of the dishwasher.
- Thus, an easy and secure way of measuring the liquid temperature is received.
- FIG 1
- is a diagram of an operating method according to the invention illustrating the distribution of the washing liquid temperature and the washing liquid quantity;
- A dishwasher comprises a washing chamber wherein usually an upper basket and a lower basket for receiving the washing load are arranged and an upper spray arm and a lower spray arm are provided each one being related to one of the respective baskets, wherein washing liquid circulates within the dishwasher and wherein the washing liquid is distributed within the washing chamber by means of the spray arms and wherein the washing liquid is supplied to both spray arms by means of at least one pump and wherein liquid heating means are provided for heating the washing liquid. In general the upper basket is provided for being loaded with more delicate washing load, e.g. glasses, wherein the lower basket is provided for more stable washing load, e.g. pots or plates. Delicate means in particular the vulnerability of the surface of the dishes. Further the circulation of the washing liquid usually comprises a sump in a bottom region of the dishwasher, wherein the washing liquid is collected coming from the washing chamber. A pump is arranged in or adjacent to the sump for circulating the washing liquid within the dishwasher or, more precisely, within the circulation system of the dishwasher. Further means for discharging washing liquid from the circulation system and means for feeding the circulation system with fresh liquid are provided. The temperature of the washing liquid might be measured within the sump or on alternative applicable positions, e.g. the spray arms or within the pump. Further the distribution of the washing liquid can be controlled in such a way, that both spray arms can be supplied with washing liquid at the same time, or only one of the spray arm. The liquid heating means and the circulation system of the dishwasher as well as the means for discharging, the means for feeding and distributing the washing liquid can be controlled by a control system. Commands to the control system can be given by a software implemented to a microcontroller connected to the control system or also from a hardware adapted to control the control system or by a user or a maintenance technician.
- The control system can control the dishwasher in such way that it is able to perform a method according to
Fig. 1 . - The diagram shows the characteristics "washing liquid temperature" and "washing liquid distribution" over a time line and how the two characteristics correlate with each other. In other words, the diagram shows the temperature of the washing liquid as measured within the sump and the periods when both spray arms or only one of the spray arms is supplied with washing liquid. The time line is subdivided in several washing phases.
Phase 1 is a pre-wash phase,phase 2 is a main wash phase,phase 3 is a cold rinse phase,phase 4 is a hot rinse phase andphase 5 is a drying phase. Inphase 2 which is the main wash phase, the washing liquid is provided with a detergent, wherein the detergent comprises an enzyme component. The washing liquid is heated up to a temperature that is adapted for the use of the detergent, in particular to a first temperature T1 which enables the enzyme component to be active without being destroyed by a higher temperature. Usually the first temperature T1 is between 45°C and 50°C, preferedly close to or exactly 50°C. Subsequently the washing liquid is kept on the first temperature T1 without further heating up to allow sufficient duration of the enzyme component being active. During this treatment it is possible to supply washing liquid to both spray arms or only to the upper spray arm to ensure that the washing load in the upper basket is washed sufficiently duringphase 2. - Further subsequently the washing liquid is heated up to a second temperature T2 which can be 65°C or higher. As soon as the washing liquid temperature exceeds 50°C, the supply of washing liquid to the upper spray arm is stopped and is not continued before the washing liquid temperature falls upon or below the first temperature T1. The lower spray arm is still continued being supplied with washing liquid.
- When the washing liquid temperature reaches the second temperature T2, a part of the washing liquid is drained from the circulation system and substituted with fresh liquid. Thus, the washing liquid temperature is reduced.
Phase 2 is continued and terminated with the washing liquid of reduced temperature, wherein the supply of the washing liquid to the upper spray arm remains stopped. Alternatively or in addition to the drain and substitution of the washing liquid, the pump speed can be reduced during heating up the washing liquid from the first temperature T1 to the second temperature T2. - Also during
phase 3 and/orphase 4 which form together a rinse phase, the washing liquid temperature is heated up from a first temperature T1 to a second temperature T2, in particular duringphase 4 which is a hot rinse phase. Also herein the supply of washing liquid to the upper spray arm is stopped when the washing liquid temperature exceeds the first temperature T1. At the beginning ofphase 3 rinse aid is added to the washing liquid and during phase 3 a part of the washing liquid is substituted with fresh liquid. The washing liquid temperature duringphase 3 does not exceed the first temperature T1 and therefore the washing liquid is supplied to upper spray arm and the lower spray arm. At the end ofphase 3, the washing liquid is drained and replaced with fresh liquid. - During
phase 4 the washing liquid is heated up, wherein the first temperature T1 is exceeded and therefore the supply of washing liquid to the upper spray arm is stopped. The washing liquid is heated up to the second temperature T2. After thatphase 5, which is a drying phase, is started. - According to
Fig. 1 the diagram illustrates a division of the characteristics "washing liquid temperature" and "washing liquid distribution" in sections A to E. In section A, washing liquid is supplied to the upper spray arm and the lower spray arm, the distribution of the washing liquid is to both at the same time or only one at a time changing after a certain time, wherein the washing liquid temperature is low and the pressure with which the washing liquid is distributed by the spray arms is also low. In section B, the supply of washing liquid to the upper spray arm is stopped. Only the lower spray arm receives washing liquid. The washing liquid temperature is high and the washing liquid pressure is also high. In section C, as in section A, the washing liquid is supplied to the upper spray arm and the lower spray arm, wherein the washing liquid temperature is low and the pressure with which the washing liquid is distributed by the spray arms is also low. In section D, the supply of washing liquid to the upper spray arm is stopped, wherein the washing liquid temperature is high and the washing liquid pressure is low. In section E the circulation of the washing liquid is stopped completely. A preferred ratio of pressures to be provided in the upper and the lower spray arm is shown in the following table.Section Sprayarm pressure Upper Lower A < 70 200 B 0 200 C < 70 < 140 D 0 110
Claims (7)
- Dishwasher, comprising a washing chamber in which at least one upper basket and at least one lower basket for receiving the washing load are or can be arranged, wherein the upper basket can receive more delicate washing load and the lower basket can receive more stable washing load, further comprising a washing liquid circulation system distributing washing liquid within the washing chamber by means of an upper spray arm and a lower spray arm and having at least one pump for supplying washing liquid to both spray arms and further comprising liquid heating means for heating the washing liquid, such that the washing liquid can be heated up at least to a first temperature T1, usually between 45°C and 50°C and subsequently to a second temperature T2, which can be 65°C or higher, wherein the first temperature T1 is lower than the second temperature T2, and characterised in that the dishwasher is configured that the supply of the washing liquid to the upper spray arm is stopped by the washing liquid circulation system when the washing liquid temperature exceeds the first temperature T1 and is not continued before the washing liquid temperature falls upon or below the first temperature T1, while the lower spray arm is still continued being supplied with washing liquid and wherein the pump speed of the at least one pump is reduced during heating up the washing liquid from the first temperature T1 to the second temperature T2 .
- Dishwasher according to claim 1 characterized in that in the washing chamber at least one upper spray arm and at least one lower spray arm each of which being substantially related to one of the respective baskets are provided.
- Dishwasher according to one of the preceding claims characterized in that a measuring system is configured to measure the liquid temperature within the sump and transfer the measured value to a control system of the dishwasher.
- Method for operating a dishwasher, wherein the dishwasher comprises a washing chamber in which at least one upper basket and at least one lower basket for receiving the washing load are or can be arranged, wherein the upper basket can receive more delicate washing load and the lower basket can receive more stable washing load, wherein the washing liquid is distributed within the washing chamber by means of an upper spray arm and a lower spray arm and wherein the washing liquid is supplied to both spray arms by means of at least one pump, comprising the following steps:- heating up the washing liquid at least to a first temperature T1 usually between 45°C and 50°C and subsequently to a second temperature T2, which can be 65°C or higher, wherein the first temperature T1 is lower than the second temperature T2; characterised by further comprising the steps:- stopping the supply of the washing liquid to the upper spray arm when the washing liquid temperature exceeds the first temperature T1, until the washing liquid temperature falls upon or below the first temperature T1 while the lower spray arm is still continued being supplied with washing liquid;- reducing the pump speed of the at least one pump during heating up the washing liquid from the first temperature T1 to the second temperature T2 .
- Method for operating a dishwasher according to claim 4, characterized in that in the washing chamber at least one upper spray arm and at least one lower spray arm each of which being substantially related to one of the respective baskets are provided.
- Method for operating a dishwasher according to one of the claim 4 or 5, comprising a main washing phase and a rinse phase, and having the following features such thata.) the washing liquid is heated up to at least the first temperature T1 in a first phase which is the main washing phase and to the second temperature T2 in a second phase which is the rinse phase; and/orb.) the main washing phase comprises the steps- heating up the washing liquid comprising a detergent to a first temperature T1 which is adapted to the detergent, in particular to an enzyme component of the detergent;- keeping the first temperature T1 for a defined period;- heating up the washing liquid to the second temperature T2, wherein supply of the washing liquid to the upper spray arm is stopped as soon as the washing liquid temperature exceeds the first temperature T1; and/orc.) the rinse phase comprises the steps- adding rinse aid to the washing liquid;- heating up the washing liquid to the second temperature T2 or beyond, wherein supply of the washing liquid to the upper spray arm is stopped as soon as the washing liquid temperature exceeds the first temperature T1; and/ord.) the main wash phase and/or the rinse phase comprises that at least a part of the washing liquid is drained by liquid circulation system drains substitutes by fresh liquid as soon as the washing liquid temperature exceeds the second temperature T2.
- Method for operating a dishwasher according to one of the claim 4, 5 or 6 characterized in that the liquid temperature is measured by a measuring system within the sump which transfers the measured value to a control system of the dishwasher.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP11752539.4A EP2611348B1 (en) | 2010-09-03 | 2011-09-02 | Dishwasher and method for operating a dishwasher |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP10175310A EP2425758A1 (en) | 2010-09-03 | 2010-09-03 | Dishwasher and method for operating a dishwasher |
EP11752539.4A EP2611348B1 (en) | 2010-09-03 | 2011-09-02 | Dishwasher and method for operating a dishwasher |
PCT/EP2011/065180 WO2012028710A1 (en) | 2010-09-03 | 2011-09-02 | Dishwasher and method for operating a dishwasher |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2611348A1 EP2611348A1 (en) | 2013-07-10 |
EP2611348B1 true EP2611348B1 (en) | 2023-11-08 |
Family
ID=43619906
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10175310A Withdrawn EP2425758A1 (en) | 2010-09-03 | 2010-09-03 | Dishwasher and method for operating a dishwasher |
EP11752539.4A Active EP2611348B1 (en) | 2010-09-03 | 2011-09-02 | Dishwasher and method for operating a dishwasher |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10175310A Withdrawn EP2425758A1 (en) | 2010-09-03 | 2010-09-03 | Dishwasher and method for operating a dishwasher |
Country Status (3)
Country | Link |
---|---|
EP (2) | EP2425758A1 (en) |
PL (1) | PL2611348T3 (en) |
WO (1) | WO2012028710A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104665740B (en) * | 2015-02-11 | 2017-06-06 | 佛山市顺德区美的洗涤电器制造有限公司 | A kind of dish-washing machine and its washing method for heating and controlling and device |
DE102017102057B4 (en) | 2016-02-29 | 2019-05-09 | Miele & Cie. Kg | Method for operating an automatic dishwasher |
DE102017208562A1 (en) * | 2017-05-19 | 2018-11-22 | BSH Hausgeräte GmbH | Dishwasher and method for operating a dishwasher |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2441361A1 (en) * | 1974-08-29 | 1976-03-11 | Bosch Siemens Hausgeraete | METHOD OF CLEANING DISHES IN A DISHWASHING MACHINE |
DE2911005A1 (en) * | 1979-03-21 | 1980-09-25 | Licentia Gmbh | Water economising dish washer - incorporates reversing valve in pressure pipe with connections for sprays, and pressure reducer |
IT1319915B1 (en) * | 2000-02-24 | 2003-11-12 | Merloni Elettrodomestici Spa | DISHWASHER MACHINE WITH THE POSSIBILITY OF DIFFERENTIATED WASHING. |
DE10257826A1 (en) * | 2002-05-16 | 2003-11-27 | Electrolux Home Prod Corp | Dishwasher and method for operating a dishwasher when using a combination preparation with several active ingredients |
DE10222216A1 (en) * | 2002-05-16 | 2003-11-27 | Electrolux Home Prod Corp | Method of operating a dishwasher, dishwasher |
KR101556124B1 (en) * | 2008-08-21 | 2015-09-30 | 엘지전자 주식회사 | Dishwasher and controlling method for the same |
KR20100023172A (en) * | 2008-08-21 | 2010-03-04 | 엘지전자 주식회사 | Controlling method for dishwasher |
IT1392419B1 (en) | 2008-12-22 | 2012-03-02 | Indesit Co Spa | METHOD TO AVOID BREAKING OF DISHES DURING WASHING IN A DISHWASHER. |
-
2010
- 2010-09-03 EP EP10175310A patent/EP2425758A1/en not_active Withdrawn
-
2011
- 2011-09-02 WO PCT/EP2011/065180 patent/WO2012028710A1/en active Application Filing
- 2011-09-02 EP EP11752539.4A patent/EP2611348B1/en active Active
- 2011-09-02 PL PL11752539.4T patent/PL2611348T3/en unknown
Also Published As
Publication number | Publication date |
---|---|
EP2611348A1 (en) | 2013-07-10 |
WO2012028710A1 (en) | 2012-03-08 |
PL2611348T3 (en) | 2024-04-08 |
EP2425758A1 (en) | 2012-03-07 |
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