DE102008043573A1 - Method for operating a dishwasher - Google Patents

Abstract

The invention relates to a method for operating a dishwasher, in particular a domestic dishwasher, in which a plurality of program steps (V, R, Z, K, T) are passed, of which in at least one program step (V, R, Z) liquid is heated to a maximum temperature (T1 ', T2, T3'), and in a further program step rinsing (K) liquid reaches a maximum rinse temperature (T4, T5). According to the invention, during at least one of the program steps (V, R, Z), liquid is heated to a maximum temperature (T1 ', T2, T3') which is substantially equal to or higher than the maximum rinse temperature (T4, T5). ,

Description

The Invention relates to a method for operating a dishwasher, in particular a household dishwasher, according to the preamble of claim 1

It are dishwashers known, the washing programs undergo a plurality of program steps, such as z. B. Pre-rinsing, cleaning, Intermediate rinse, Rinse and drying the cleaned dishes. It will be during some of the Pogrammschritte, such as. As cleaning or rinsing, liquid z. B. heated with a designed as a water heater heating medium. there should while of the program step Clean by heating liquid the cleaning performance be increased while at the program step rinsing by applying heated liquid, such as. B. with rinse aid added water, the drying of cleaned dishes in the following Program step drying should be improved or accelerated.

Of the Invention is based on the object, the energy consumption at a constant To reduce cleaning and drying results.

The The invention is based on a method for operating a dishwasher, in particular a household dishwasher, wherein a plurality of program steps, of which at least a program step liquid heated to a maximum temperature and, in another program step, rinse liquid a maximum rinse temperature reached.

According to the invention, it is provided that while at least one of the program steps liquid to a maximum Temperature warmed up which is substantially equal to or higher than the maximum rinse temperature is. This allows for a particularly energy-efficient cleaning of ware, where at the same time the dishes due to the low temperature differences low thermal loads is exposed and thus spared. It is under a substantially same temperature understood that the temperatures z. B. due to manufacturing tolerances and / or natural Deviations during of operation slightly differ from each other, for. B. by about 5 to 10 ° C.

In A further development is provided that during at least one program step Clean the maximum temperature higher than the maximum rinse temperature is on the liquid in the program step rinsing heated becomes. This z. B. by particularly high temperatures in the program step Cleaning compared to the program step rinsing a special high cleaning performance achieved because an optimum temperature is reached at the Program step Clean added detergents their maximum Unfolding effect, reducing the energy required for rinsing is.

there a development is provided that during at least one program step cleaning the maximum temperature is substantially between 5 and 50 ° C, in particular between 10 and 30 ° C higher than the maximum rinse temperature is on the liquid in the program step rinsing heated becomes.

In A further development is provided that during at least a program step Pre-rinse the maximum temperature is higher than the maximum rinse temperature is on the liquid in the program step rinsing heated becomes. This allows the cleaning result to be further improved, because of the increased liquid temperature the removal line during of the program step Pre-rinse can be further increased without detergent addition.

there a further development is provided, that during at least one program step the pre-wash maximum temperature substantially between 1 and 20 ° C, in particular between 5 and 10 ° C higher than the maximum rinse temperature is on the liquid in the program step rinsing heated becomes.

In A further development is provided that during at least of a program step intermediate rinse the maximum temperature higher than the maximum rinse temperature is on the liquid in the program step rinsing heated becomes. This allows a particularly energy-efficient operation of a Dishwasher.

there a development is provided that during at least one program step intermediate rinsing the maximum temperature substantially between 1 and 20 ° C, in particular between 5 and 10 ° C higher than the maximum rinse temperature is on the liquid in the program step rinsing heated becomes.

In a further development it is provided that at least temporarily during one of the program steps during which liquid is heated, a desorption of a reversible, dehydratable drying material, in particular zeolite, is performed. This allows a particularly energy-efficient operation using a Sorptionstrocknungssystems stored during a drying process in the drying material Moisture is then expelled again by introducing heat energy, wherein the expended for expelling thermal energy is also used for heating of items to be washed and / or liquid.

there is a training provided that at least temporarily during a another program step drying moisture of moist air from a reversible, dehydratable drying material, in particular Zeolite is added. This allows a particularly energy-efficient drying of cleaned items, there is no or only a minor one warming of liquid in the program step rinsing is required to obtain an optimal cleaning result.

It is provided in a continuing education that during a program step Drying dishes by passing moist air from an interior of the dishwasher is dried by a sorption drying system.

In a further development is provided that in a water tank the dishwasher stored liquid is used in at least one of the program steps. Such a Water tank can be in heat-conducting with the environment of the dishwasher Connection, so that cached in the water tank Liquid, such as B. water from a home-based supply system, itself warm to room temperature can. If the stored liquid in the water tank z. B. in a program step prewash this increases the cleaning effect and reduces Total energy consumption again.

Further the object of the invention is achieved by a dishwasher, in particular household dishwasher, with heating means for at least temporary heating of liquid to a maximum temperature during a program step of a plurality of program steps, and designed for performing another program step rinse, in which liquid a maximum rinse temperature achieved, according to the invention, that while at least one of the program steps liquid a maximum temperature that is higher as the maximum rinse temperature is.

further developments the dishwasher according to the invention are given in the subclaims.

The The invention and its development are described below with reference to drawings explained in more detail.

The The invention and its development are described below with reference to drawings explained in more detail.

It demonstrate:

1 a schematic representation of an embodiment of a dishwasher according to the invention with a Sorptionstrocknungssystem,

2 a schematic representation of the temperature profile during a first embodiment of a Spülprogrammdurchlaufs invention,

3 a schematic representation of the temperature profile of a further, second embodiment of a Spülprogrammdurchlaufs invention, and

4 a schematic representation of the temperature profile of another, third embodiment of a Spülprogrammdurchlaufs invention.

It is going on first 1 Referenced.

A in the present embodiment as Domestic dishwasher trained dishwasher GS has a serving as a washing container Interior IR on, by means of an on the dishwasher GS hinged hinged door (not shown) for loading and unloading to be opened or closed can. In the interior IR of the dishwasher GS are baskets GK to Recording of items to be cleaned provided from the interior IR of the dishwasher GS can be pulled out, to facilitate loading and unloading.

Around that in the baskets GK stored dishes to be cleaned in the interior IR of the dishwasher GS as spray arms SA trained means for applying wash ware provided with liquid, wherein it is the liquid to z. B. act with cleaning agents or with rinse aid added water can, so a cleaning effect or streak-free drying to effect. The dishes flowing down liquid accumulates in a pump sump PS, which is in the bottom area of the interior IR of the dishwasher GS is arranged.

The spray arms SA are liquid-conductively connected via a supply line ZL with a circulation pump UP, which in addition to other component components of the dishwasher GS in a bottom assembly BO below the interior of the IR Dishwasher GS is arranged. During operation, ie when the circulation pump UP is running, the circulation pump UP sucks the liquid accumulated in the pump sump PS and delivers it through the supply line ZL to the spray arms SA. In order to heat the liquid circulated by the operation of the circulating pump UP, the circulating pump has an integrated water heater WZ for heating the liquid. Alternatively, in addition to the circulation pump UP, a separate instantaneous water heater or another water heater may be provided. For emptying the interior IR of the dishwasher GS, a drain pump LP is provided, which is also in fluid-conducting connection with the pump sump PS and can be connected to a disposal line EL to a house-side sewage disposal network.

Further has the dishwasher GS a Sorptionstrockungssystem, with which in the baskets GR arranged and cleaned dishes at the end of a wash cycle can be dried. For this purpose, in the bottom assembly BO a sorption SB provided, over an air channel LK is conductively connected to an inlet EI, wherein a fan LT is provided for generating a forced flow. Around the sucked through the inlet EI and by the fan LT in the sorption tank transported air again in the interior IR of the dishwasher GS zurückzufördern is an exhaust opening AU provided in the bottom area of the interior IR dishwasher GS.

Around to effect a drying of cleaned items is through the fan LT air from the interior IR of the dishwasher GS sucked through the sorption tank SB passed and again through the exhaust opening AU back into the interior IR of the dishwasher GS headed. In order to dry the circulating air is in the sorption SB a drying agent for performing an exothermic drying intended. It is a reversibly dehydratable Drying material, eg. As zeolite, due to its hydroscopic Property absorbs water, at the same time heat energy is released. Through this released heat energy will be a warming the circulated Air causes what at the same time the moisture absorption capacity of the circulating air elevated. At the end of a drying process is an amount of liquid in the drying material ZEO saved.

Around the capacity desiccant ZEO for a new wash cycle To restore, an air heater HZ is provided in the present embodiment in the sorption tank SB is arranged. However, it is also possible to have an air heater outside of the sorption container SB to arrange, for. B. in the air duct LK to a heating of the in the sorption tank SB sponsored To cause air. To the amount of liquid stored in the drying material ZEO to drive out, a generated with the fan LT air flow is heated, so that the drying material ZEO be heated to temperatures can, in which the amount of water stored in the drying material ZEO can be released again.

It will now be added to the 2 to 4 Referenced.

Dishwashers GS continuous for cleaning and drying of items to be cleaned, wash programs, which consist of a plurality of program steps, which are passed through successively. Such a program may consist of the program steps pre-wash V, cleaning R, intermediate rinsing Z, rinsing K and drying T, with individual program steps such. B. the pre-wash V or intermediate rinse Z can also be hidden, while it is also conceivable to pass through individual program steps repeatedly, such. For example, the intermediate rinsing Z. During the pre-rinsing V, for example, dishes are charged with water without the addition of detergents, this being done either with unheated water or heated by a heater water. For this purpose, water can be used that has been stored in a water tank (not shown). Such a water tank can be in heat-conducting connection with the environment of the dishwasher, so that in the water tank cached liquid such. B. water from a home-based supply system, can warm to room temperature. In the cleaning step R, cleaning of items to be washed takes place by application of detergent-added water, ie during the cleaning stage a detergent addition takes place. Furthermore, a heating of the liquid, so as to increase the cleaning effect of the cleaning agent. In this case, the cleaning step R is composed of a heating phase P1, P2, in which the liquid is heated in the dishwasher GS by means of heating until a predetermined maximum temperature is reached and a subsequent Nachwaschphase together, while the heater is turned off, the slowly cooling liquid means the circulating pump UP is circulated. In the intermediate rinse Z program step, liquid is applied to the items to be washed in order to convey dirt residues from the dishwasher GS. The next step in the program is rinsing K in preparation for the program step drying T, in which water mixed with rinse aid is circulated by means of the circulation pump and via the spray arms SA to the now cleaned rinse is well applied. Finally, the program step drying T, in which the ware is no longer charged with liquid, but by operation of the fan LT through the interior IR of the dishwasher GS and the sorbent SB circulating air flow is generated. A complete or at least partial fluid change can be carried out between the individual program steps, ie the dishwasher GS is emptied by means of the drain pump LP and the disposal line EL and refilled again by a supply line (not shown) making a connection to a house-side supply system.

In the rinse program according to 2 takes place only in the program step cleaning R heating of liquid. In this case, starting from a starting temperature T0, during a first phase P1, the liquid circulated by the circulation pump UP is heated by the air heater HZ in the sorption tank SB to a maximum temperature T1, wherein the fan LT at the same time circulates through the interior IR of the dishwasher GS air flow generated. The air heater HZ heats the drying material ZEO into the sorption container SB to temperatures at which the amount of water stored in the drying material ZEO is expelled from the drying material ZEO and conveyed through the outlet opening AU into the interior IR dishwasher GS. Due to the effect of the air heater HZ this amount of liquid is heated and thus causes by mixing the already circulated with the circulation pump UP liquid heating of the total amount of liquid in the interior IR dishwasher GS. Characterized in that by means of the air heater HZ during the program step cleaning R heating up to the first temperature T1, it is ensured that the dry material ZEO can be reliably and completely desorbed by the circulation of relatively cold and dry air from the interior IR dishwasher GS , Instead of a rigid rinsing program sequence in which a desorption process is carried out in a first program section, in which a heating of liquid takes place, it can also be provided in an alternative embodiment to evaluate the parameters influencing the desorption process for determining the time for performing the desorption. This can be the air temperature and the water inlet temperature. For example, a desorption process in a program step cleaning or rinsing or, if appropriate, during the program step pre-rinse done.

During the Desorbing by means of the air heater HZ is the exhaust opening AU in the interior IR dishwasher GS cooled, so as to ensure that it is due to the heating power of the air heater HZ does not cause excessive heating of the exhaust vent HZ comes with overheating damage.

For this is during the operation of the air heater HZ, d. H. z. B. during the phase P1, the circulation pump Operated UP, so that by the circulation pump liquid from the pump sump PS through the feed line to the spray arm SA promoted becomes. This will make the spray arms SA set in rotation and cause by spraying the exhaust opening AU, in particular one the exhaust opening AU cap with fluid, a cooling the same.

In one next Phase P2 of the program step cleaning R is by means of the water heater WZ the amount of fluid starting from the first temperature T1 to the second temperature T2 heated up.

In order to increase the cleaning effect during the program step cleaning R, it is provided by increasing the rotational speed of the circulation pump UP to increase the spray pressure of the water jets emerging from the spray arm SA. For this purpose, during the program step cleaning R during the Nachwaschphase NA, the volume of liquid circulated by means of the circulation pump UP is increased by a refilling step, for example. At time t1 (see. 2 ) and then increases the speed of the circulation pump UP, z. B. continuously until the circulation pump runs under run-round condition, ie, during operation no air bubbles sucks, which reduces the flow rate of the circulation pump UP and leads to an undesirable noise. This makes it possible to take into account the amount of liquid released during the desorbing, which was stored in the drying material ZEO, in the dimensioning of the amount of liquid to be replenished and thus to reduce the total water requirement with improved cleaning performance.

Between the program step rinsing K and the program step drying T a dripping AB is provided (see. 2 ), while the liquid adhering to the cleaned items to be washed, ie, water added with rinse aid, can run off the items to be washed due to gravity and can collect in the pump sump PS of the interior IR of the dishwasher GS. As a result, the amount of liquid to be absorbed by the sorption drying system is reduced and thus the duration of the program step drying T.

Before this draining phase AB, ie at the end of the program step rinse K, an Ab pumping operation, in which the liquid mixed with rinse aid is conveyed by means of the drain pump LP through the discharge line EL in a house-side sewage disposal system. This is followed by the Abtropfphase AB, during which neither the circulation pump UP nor the drain pump LP and not the fan LT or one of the heaters HZ, WZ are in operation. After expiration of this dripping AB, the program step drying T starts by putting the fan LT, so that a circulating through the interior IR of the dishwasher and the sorbent SB air flow is generated to dry the cleaned items in the baskets GK. At the end of the program step drying T, a further pumping down by means of the drain pump LP, by means of which a remaining amount of liquid from the dishwasher GS is conveyed through the discharge line EL in a house-side sewage disposal system. Alternatively, it can also be provided to perform a further pump-down process additionally or alternatively at the beginning of the program step drying T.

In the washing program according to 3 and 4 For this purpose, by means of the air heater HZ liquid is heated starting from a start temperature T0 during a phase P1 'to a temperature T1' in which as described above by means of the fan LT by a the interior IR of the dishwasher GS and the sorbent SB circulating air flow is generated. After reaching the temperature T1 ', the air heater HZ is deactivated. At this time, the drying material ZEO is not completely desorbed, ie in the drying material ZEO a residual amount of water is stored. To expel this amount of residual water from the drying material ZEO and thus have a again fully water-absorbent drying material ZEO at the beginning of the program step drying T available, the liquid is heated by the air heater HZ to a temperature T1 in the subsequent program step cleaning R and then by operating the Water heating to the temperature T2 heated. That is, the desorption phase of the drying agent ZEO in the sorption container SB is divided into two parts in this embodiment and is distributed over two program steps, namely the program step pre-wash V and the program step cleaning R.

In order to increase the cleaning effect by further increasing the temperature, another phase P3 (cf. 3 ), while the water heating WZ is used to further heat the liquid to a temperature T3.

In order to improve the drying result at the end of the program step drying T, in the embodiments according to FIGS 3 and 4 provided that during the rinse step K, a heating of the liquid takes place. For this purpose, during a phase P4 by means of the water heater WZ liquid, which is water or water mixed with rinse aid, is heated to a temperature T4. Alternatively, instead of the water heater and the air heater HZ can be used to z. B. to complete a hitherto in the course of the program is not complete desorption. In addition, during a further phase P5, a further heating of the liquid to a temperature T5 can take place in order to improve the drying with the sorption drying system.

FROM

dripping

AU

Ausblassöffnung

BO

bottom assembly

EGG

inlet

EL

disposal line

GK

dish rack

GS

dishwasher

HZ

air heating

IR

inner space

LK

air duct

LP

Drain pump

LT

Fan

N / A

post-wash

P1 '

phase 1'

P1

phase 1

P2

phase 2

P3

phase 3

P4

phase 4

P5

phase 5

PS

sump

SA

spray arm

SB

sorption

t1

Nachfüllzeitpunkt

T0

starting temperature

T1 '

temperature

T1

temperature

T2

temperature

T3

temperature

T4

temperature

T5

temperature

UP

circulating pump

WZ

water Heating

ZEO

drying material

ZL

feed

Claims (22)

Method for operating a dishwasher, in particular a domestic dishwasher, in which a plurality of Pro program steps (V, R, Z, K, T) are passed, of which in at least one program step (V, R, Z) liquid to a maximum temperature (T1 ', T2, T3') is heated, and in another program step Rinsing (K) liquid reaches a maximum rinse temperature (T4, T5), characterized in that liquid is heated to a maximum temperature (T1 ', T2, T3') during at least one of the program steps (V, R, Z) Is substantially equal to or higher than the maximum rinse temperature (T4, T5). Method according to claim 1, characterized in that that while at least one program step cleaning (R) liquid is heated to the maximum temperature (T2, T3 '). Method according to claim 1 or 2, characterized that while at least one program step cleaning (R) the maximum temperature essentially between 5 and 50 ° C, in particular between 10 and 30 ° C higher than the rinse temperature (T4, T5) is the liquid in the program step rinsing (K) reached. Method according to at least one of claims 1 to 3, characterized in that during at least one program step prewash (V) liquid to the maximum temperature (T1 ') heated becomes. Method according to at least one of claims 1 to 4, characterized in that during at least one program step prewash (V) the maximum temperature substantially between 1 and 20 ° C, in particular between 5 and 10 ° C higher than the maximum rinse temperature (T4, T5) is the liquid in the program step rinsing (K) reached. Method according to at least one of claims 1 to 5, characterized in that during at least one program step Intermediate rinsing (Z) liquid is heated to the maximum temperature. Method according to at least one of claims 1 to 6, characterized in that during at least one program step Intermediate rinsing (Z) the maximum temperature is substantially between 1 and 20 ° C, in particular between 5 and 10 ° C higher than the maximum rinse temperature (T4, T5) is on the liquid in the program step rinsing (K) heated becomes. Method according to at least one of claims 1 to 7, characterized in that at least temporarily during a the program steps (V, R, Z) during which liquid heated desorption of a reversible, dehydratable drying material, in particular zeolite (ZEO) is performed. Method according to at least one of claims 1 to 8, characterized in that during a program step Drying (T) of items to be washed through Passing moist air from an interior (IR) of the dishwasher (GS) is dried by a sorption drying system. Method according to claim 9, characterized in that that humidity of the humid air from a reversible, dehydratable Drying material, in particular zeolite (ZEO) of the sorption drying system is recorded. Method according to at least one of claims 1 to 10, characterized in that in a water tank of the dishwasher stored liquid used in at least one of the program steps (V, R, Z, K) becomes. Dishwasher, in particular household dishwasher, with heating means for at least temporary heating of liquid to a maximum temperature (T1 ', T2, T3 ') during a Program step (V, R, Z) of a plurality of program steps (V, R, Z, K), and configured to perform another program step Rinse (K), where the liquid a maximum rinse temperature (T4, T5), characterized in that during at least one of the program steps (V, R, Z) liquid a maximum temperature (T1 ', T2, T3'), which in the Essentially the same or higher as the maximum rinse temperature (T4, T5) is. dishwasher according to claim 12, characterized in that during at least one program step Clean (R) the maximum temperature (T2, T3 ') higher as the maximum rinse temperature (T4, T5) is. dishwasher according to claim 12 or 13, characterized in that during at least of a program step cleaning (R) the maximum temperature (T2, T3 ') substantially between 5 and 50 ° C, in particular between 10 and 30 ° C higher than the maximum rinse temperature (T4, T5) is. dishwasher according to at least one of the claims 12 to 14, characterized in that during at least one program step prewash (V) the maximum temperature (T1 ') higher than the maximum rinse temperature (T4, T5) is. Dishwasher according to at least one of claims 12 to 15, characterized gekennzeich net, that during at least one prerinsing program step (V) the maximum temperature (T1 ') is substantially between 1 and 20 ° C, in particular between 5 and 10 ° C higher than the maximum rinse temperature (T4, T5). dishwasher according to at least one of the claims 12 to 15, characterized in that during at least one program step intermediate rinse (Z) the maximum temperature higher as the maximum rinse temperature (T4, T5) is. dishwasher according to at least one of the claims 12 to 17, characterized in that during at least one program step intermediate rinse (Z) the maximum temperature substantially between 1 and 20 ° C, in particular between 5 and 10 ° C higher than the maximum rinse temperature (T4, T5) is. dishwasher according to at least one of the claims 12 to 18, characterized in that a sorption drying system at least one reversible, dehydratable drying material, in particular Zeolite (ZEO), having at least partially during one the program steps (V, R, Z) during which liquid heated becomes desorbable. dishwasher according to claim 19, characterized in that during a program step Drying (T) of items to be washed humid air from an interior (IR) of the dishwasher (GS) through the sorption drying system is durchleitbar. dishwasher according to at least one of the claims 12 to 20, characterized in that the sorption drying system at least one reversible, dehydratable drying material, in particular Zeolite (ZEO), of which at least temporarily during the Program step Drying (T) Humidity of moist air can be absorbed is. dishwasher according to at least one of the claims 12 to 21, characterized in that the dishwasher (GS) a water tank for storage in at least one of Program steps (V, R, Z, K) has usable liquid.