EP2352413A1

EP2352413A1 - Method for operating a dishwasher

Info

Publication number: EP2352413A1
Application number: EP09736941A
Authority: EP
Inventors: Michael Fauth; Helmut Jerg; Kai Paintner; Andreas Reiter; Roland Rieger
Original assignee: BSH Bosch und Siemens Hausgeraete GmbH
Current assignee: BSH Hausgeraete GmbH
Priority date: 2008-11-07
Filing date: 2009-10-16
Publication date: 2011-08-10
Anticipated expiration: 2029-10-16
Also published as: EP2352413B1; US9955845B2; US20110203614A1; PL2352413T3; RU2505263C2; ES2391249T3; WO2010052116A1; CN102209484B; DE102008043576A1; CN102209484A; RU2011119250A

Abstract

The invention relates to a method for operating a dishwasher (GS), especially a household dishwasher, wherein a desorption process for the desorption of a reversibly dehydrogenable dry material (ZEO), especially zeolite, of a sorption drying system is generated at least temporarily. According to the invention, parameters influencing the desorption process are evaluated in order to determine when to carry out the desorption process.

Description

Method for operating a dishwasher

The invention relates to a method for operating a dishwasher, in particular a domestic dishwasher according to the preamble of patent claim 1.

DE 103 53 774 A1, DE 103 53 775 A1 and DE 10 2005 004 096 A1 disclose dishwashers with so-called sorption drying systems for the exothermic drying of cleaned dishes. Here, in a partial program step "drying" the dishwasher of the dishwasher for drying items by means of a ventilated moist air from the washing compartment serving as the dishwasher interior through a sorption and withdrawn through the sorbent located in the sorbent reversibly dehydratable drying moisture from the air passed. For regeneration, ie desorption of the drying material, the reversibly dehydratable drying material is heated to very high temperatures, whereby water stored in this drying material emerges as hot water vapor and is conducted into the rinsing container by means of an airflow generated by the fan a washware in the rinse tank and the air in the rinse tank are heated, Such a sorption drying system has proven to be energy-saving and quiet drying of the dishes proved to be very beneficial.

The object of the invention is to achieve a further improved desorption result for the reversibly dehydratable drying material of the sorption drying apparatus.

The invention is based on a method for operating a dishwasher, in particular a domestic dishwasher, with a sorption drying system in which a desorption process of a reversibly dehydratable dry material, in particular zeolite, is effected at least temporarily.

According to the invention, it is provided that parameters influencing the desorption process are evaluated for determining the time for carrying out the desorption.

This allows for an adapted selection of the time at which the Desorption should take place to ensure efficient desorption, since it is ensured that the desorption is carried out when the temperature of the air in the interior of the dishwasher is relatively low and thus the moisture absorption capacity of the air is greatest.

In a continuing connection is provided that the air temperature in the dishwasher and / or the water inlet temperature are detected as parameters. Thus, only the air temperature alone or the water inlet temperature alone or both temperatures can be evaluated together. The air temperature in the dishwasher depends on room temperature in the vicinity of the dishwasher. However, the air temperature can also deviate greatly from the room temperature, if shortly before a Spülprogrammlauf took place without it could come to a cooling of the dishwasher. If only the air temperature or water inlet temperature is detected, the determination of the time for performing the desorption can be made on the basis of stored values, e.g. in tabular form. In this case, the degree of cooling is determined by the water inlet temperature by refilling with liquid, in particular with water from a home-side supply system. If, on the other hand, both the air and the water inlet temperature are detected, a comparison with stored values can also be made and / or the difference of the two temperatures is evaluated and the time of desorption is determined. The difference between these two temperature values is therefore a measure for determining how strong the temperature in the interior of the dishwasher will fall below the starting temperature. As an alternative to detecting the air temperature, the detection of the room temperature can also be provided alone or together with the water inlet temperature at the installation site of the dishwasher.

In a further connection, it is provided that a desorption process is carried out at least partially during a first program step during which the heating means of the dishwasher are operated when the air temperature is higher than the water inlet temperature by a predetermined temperature value at the most. In this case, the heating means may be an air heater, can be erwakbar with the air, which is driven by the drying material. In this case, no excessive cooling is to be expected by refilling with liquid, so that a Desortionsvorgang is performed in the first program step in which a heating of liquid takes place, such as the program step cleaning or the program step pre-wash, if a particularly intensive cleaning is desired. In a further connection, it is provided that a desorption process is carried out at least partially during a program step in which heating means are operated after an at least partial liquid change when the air temperature is higher than the water inlet temperature by at least a predetermined temperature value. In this case, a significant cooling is to be expected by refilling with liquid, so that a Desortionsvorgang is carried out at the later program step, before a refilling is carried out as part of a fluid change.

It can be e.g. to the program step cleaning or the program step rinse clear

In a continuing connection is provided that the predetermined temperature value is selected substantially between 3 to 30 ⁰ C, in particular between 5 and 15 ° C. This ensures that only in the case of large temperature differences does the time of the desorption process be postponed, in which due to the high starting temperature no complete and efficient desorption is to be expected.

In a continuing connection, it is provided that the desorption process is carried out at least partially during a program step cleaning with detergent addition and cleaning action. This allows a particularly energy-efficient cleaning of items to be washed.

In a continuing connection, it is provided that the desorption process is carried out at least partially during a pre-rinse program step without cleaning agent addition. As a result of the associated heating, the cleaning effect during the program step of pre-rinsing and thus of the rinsing program can be increased.

In a continuing connection, it is provided that the desorption process is carried out at least partially during a program rinse with rinse aid addition. By the associated heating, the drying effect during the subsequent program step drying can be increased or the duration of the program step drying can be reduced.

In a continuing connection is provided that in a thermally conductive contact with the

Surrounding the dishwasher standing water tank a quantity of liquid, in particular a quantity of fresh water from a home-side water supply system is cached. The water tank is at the end of a Rinsing program run filled, so that in the meantime, until the next start of a Spülprogrammdurchlaufs cached in the water tank amount of water from the inlet water temperature of eg 15 ° C can warm to room temperature. This liquid heated to room temperature is used in a rinse cycle to perform the rinse program step of pre-rinse. A renewed filling with water from the water supply system causes a corresponding cooling below the room temperature.

Furthermore, the object of the invention is achieved by a dishwasher, in particular a domestic dishwasher, which is formed at least partially in at least one program step of a plurality of program steps

Desorption of a reversibly dehydratable dry material, in particular

Zeolite, a Sorptionstrocknungssystem to effect, according to the invention provided that detection means for detecting environmental parameters at the site of the dishwasher and evaluation means for determining the time for

Implementation of the desorption are provided.

Further developments of the dishwasher according to the invention are specified in the subclaims.

The invention and its development will be explained in more detail with reference to drawings.

Show it:

1 is a schematic representation of an embodiment of a dishwasher according to the invention with a sorption drying system,

FIG. 2 shows a schematic representation of the temperature profile during a first embodiment of a rinsing program run according to the invention, FIG.

3 shows a schematic representation of the temperature profile of a further, second exemplary embodiment of a rinsing program run according to the invention, and

4 is a schematic representation of the temperature profile of a further, third exemplary embodiment of a rinsing program run according to the invention. Reference is first made to FIG.

A dishwasher GS designed in the present exemplary embodiment as a domestic dishwasher has an interior space IR serving as a washing container, which can be opened or closed for loading and unloading by means of a door (not shown) pivotably hinged to the dishwasher GS. By doing

Interior IR of the dishwasher GS dish baskets GK are provided for receiving items to be cleaned, which can be pulled out of the interior IR of the dishwasher GS to facilitate loading and unloading.

In order to clean the items to be stored in the crockery baskets GK, means for supplying items to be washed with liquid are provided in the interior IR of the dishwasher GS as spraying arms SA, wherein the liquid may, for example, be filled with water. can act with detergents or with rinse aid added water, so as to effect a cleaning effect or streak-free drying. The liquid flowing down from the items to be washed collects in a pump sump PS, which is arranged in the bottom area of the interior IR of the dishwasher GS.

The spray arms SA are fluidly connected via a supply line ZL with a circulation pump UP, which is arranged in a floor assembly BO below the interior IR of the dishwasher GS, among other components components of the dishwasher. In operation, i. 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.

Furthermore, the dishwasher GS has a Sorptionstrockungssystem, with the arranged in the baskets GR and cleaned items at the end of a Rinse program run can be dried. For this purpose, a sorption SB is provided in the bottom assembly BO, which is air-conductively connected via an air duct LK with an inlet El, wherein for generating a forced flow, a fan LT is provided. To reclaim the air sucked in through the inlet El and conveyed by the ventilator LT into the sorption container back into the interior IR of the dishwasher GS, an outlet opening AU is provided in the bottom area of the interior IR dishwasher GS.

In order to effect a drying of cleaned items to be washed, air is sucked out of the interior IR of the dishwasher GS by the fan LT through the sorption container

SB and again through the exhaust opening AU back into the interior of the IR

Dishwasher GS passed. In order to dry the circulating air is in the

Sorption SB a drying agent for performing an exothermic drying provided. It is a reversibly dehydratable drying material, e.g. Zeolite, which absorbs water due to its hydroscopic property, at the same time heat energy is released. This released heat energy becomes a

Warming of the circulating air causes, at the same time the

Moisture absorption capacity of the circulating air increases. At the end of a

Drying process is an amount of liquid stored in the drying material ZEO.

In order to restore the capacity of the drying agent ZEO for a new wash program run, an air heater HZ is provided, which is arranged in the present embodiment in the sorption SB. However, it is also possible to arrange an air heater outside the sorbent tank SB, e.g. in the air passage LK to cause heating of the conveyed into the sorbent SB air. In order to expel the amount of liquid stored in the drying material ZEO, an air flow generated by the fan LT is heated, so that the drying material ZEO can be heated to temperatures at which the amount of water stored in the drying material ZEO can be released again.

Reference is now additionally made to FIGS. 2 to 4.

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 can from the Program steps pre-rinse V, cleaning R, intermediate rinsing Z, rinsing K and drying T exist, with individual program steps, such. B. the pre-rinsing V or intermediate rinsing Z can also be hidden, while it is also conceivable to pass through individual program steps repeatedly, such as the intermediate rinsing Z. During the pre-rinsing V eg. Wash ware is charged with water without the addition of detergents, this either with unheated water or with heated water by means of a heater. 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 liquid stored in the water tank, such as water from a home-side supply system, can warm up 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 is added. 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 by 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 applied to the now cleaned items via the spray arms SA. 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 wash program sequence according to FIG. 2, heating of liquid takes place only in the program step cleaning R. In this case, starting from a start temperature TO first during a first phase P1, the liquid circulated by the circulation pump UP is transmitted through heated air heater HZ in the sorption SB to a maximum temperature T1, wherein at the same time the fan LT generates a circulating through the interior IR of the dishwasher GS air flow. 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 desorbing by means of the air heater HZ, the blow-out opening AU is cooled in the interior IR dishwasher GS, so as to ensure that due to the heating power of the air heater HZ no excessive heating of the blow-out opening HZ with overheating damage occurs.

For this purpose, during operation of the air heater HZ, ie, for example, during the phase P1, the circulation pump UP is operated so that liquid is conveyed by the circulation pump from the pump sump PS through the supply line to the spray arm SA. In this way, the spray arms SA are set in rotation and cause by spraying the exhaust opening AU, in particular a cap covering the discharge opening AU with liquid, a cooling thereof. In a next phase P2 of the program step cleaning R, the amount of liquid is heated from the first temperature T1 to the second temperature T2 by means of the water heater WZ.

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 amount of liquid circulated by the circulation pump UP increased by a refilling step, for example, at time t1 (see Figure 2) and then increases the speed of the circulation pump UP, e.g. continuously until the recirculation pump runs under run-flat condition, i.e., does not draw in air bubbles during operation, which reduces the delivery rate of the recirculation pump UP and results in 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 Figure 2), while adhering to the cleaned items to be washed

Liquid, i. with rinse aid added water, can drain from the dishes due to gravity and in the pump sump PS of the interior of the IR

Dishwasher GS can collect. As a result, the of the

Sorption drying system reduces the amount of liquid to be absorbed and thus the duration of the program step drying T.

Before this Abtropfphase AB, ie at the end of the program step rinse K, a Abpumpvorgang takes place, in which the liquid mixed with rinse aid is conveyed by the drain pump LP through the drain line EL in a house-side sanitation 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 another 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 wastewater 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 rinsing program according to FIGS. 3 and 4, liquid is heated in the first of the program steps, the pre-rinsing program step V. For this purpose, liquid is heated from a starting temperature TO during a phase PV to a temperature TV by means of the air heating HZ, as described above by means of the fan LT a circulating through the interior IR of the dishwasher GS and the sorbent SB air flow is generated. After reaching the temperature TV, the air heater HZ is deactivated. At this time, the drying material ZEO is not yet completely desorbed, i. 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. In other words, the desorption phase of the drying agent ZEO in the sorption container SB is divided into two in this exemplary embodiment and is distributed over two program steps, namely the preprocessing program step V and the program step cleaning R.

In order to increase the cleaning effect by further increasing the temperature, a further phase P3 (see FIG. 3) can be provided, while the water heater 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, it is provided in the exemplary embodiments according to FIGS. 3 and 4 that the liquid is heated during the rinsing step K. 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, for this purpose, instead of the water heating and the air heater HZ be used to complete, for example, a previously not complete in the course of the program desorption. In addition, during another phase P5 further heating of the liquid to a Temperature T5 done to improve drying with the sorption drying system.

Bezugszeichenhste

AB dripping phase

AU exhaust opening

BO floor assembly

El inlet

EL disposal line

GK crockery basket

GS dishwasher

HZ air heating

IR interior

LK air duct

LP drain pump

LT fan

NA post-wash phase

P ₁ . Phase 1 '

P1 phase 1

P2 phase 2

P3 Phase 3

P4 Phase 4

P5 Phase 5

PS pump sump

SA spray arm

SB sorption tank t1 Refill time

TO start temperature

T1 'temperature

T1 temperature

T2 temperature

T3 temperature

T4 temperature

T5 temperature

UP circulating pump

WZ water heating

ZEO drying material

ZL supply line

Claims

claims

1. A method for operating a dishwasher (GS), in particular a domestic dishwasher, in which at least temporarily

Desorption of a reversibly dehydratable dry material (ZEO), in particular zeolite, a sorption drying system is effected, characterized in that the desorption process influencing parameters are evaluated for determining the time for performing the desorption.

2. The method according to claim 1, characterized in that the air temperature in the dishwasher (GS) and / or the water inlet temperature are detected as parameters.

3. The method according to claim 2, characterized in that a desorption process at least partially during a first program step (V, R), during the heating means of the dishwasher (GS) are operated by a plurality of program steps (V, R, Z, K, T) is performed when the air temperature at most by a predetermined temperature value higher than the

Water inlet temperature is.

4. The method according to claim 2 or 3, characterized in that a desorption process at least partially during a program step (R, K) of a plurality of program steps (V, R, Z, K, T) during the heating of the

Dishwasher (GS) is performed, performed when the air temperature is at least by a predetermined temperature value higher than the water inlet temperature.

5. The method according to claim 3 or 4, characterized in that the predetermined temperature value is selected substantially between 3 to 30 ⁰ C, in particular between 5 and 15 ° C.

6. The method according to at least one of claims 3 to 5, characterized in that the desorption process at least partially during a program step

Cleaning (R) with detergent addition and cleaning action is carried out.

7. The method according to at least one of claims 3 to 6, characterized in that the desorption at least partially during a program step pre-rinsing (V) is performed with cleaning effect without detergent addition.

8. The method according to at least one of claims 3 to 7, characterized in that the desorption process is carried out at least partially during a program step rinsing (K) with rinse aid addition.

9. The method according to at least one of claims 1 to 9, characterized in that in a standing in heat-conductive contact with the environment of the dishwasher (GS) water tank, an amount of liquid, in particular a quantity of fresh water from a house-side water supply system is cached.

10. The method according to at least one of claims 1 to 10, characterized in that formed as an air heating heating means (HZ) are used.

11. Dishwasher (GS), in particular domestic dishwasher, with a Sorptionstrocknungssystem formed, at least temporarily one

Desorption process of a reversibly dehydratable dry material (ZEO), in particular zeolite, characterized in that

Detection means for detecting the desorption process influencing parameters and evaluation means for determining the time based on the

Parameters are provided for carrying out the desorption.

12. Dishwasher (GS) according to claim 11, characterized in that the detection means for detecting the air temperature in the dishwasher (GS) and the water inlet temperature are formed.

13. Dishwasher (GS) according to claim 1 1 or 12, characterized in that the evaluation means are arranged such that a desorption at least partially in a first program step (V, R) of a plurality of program steps (V, R, Z, K, T), while the heating means (HZ) of the dishwasher (GS) are operated when the air temperature at most by a predetermined temperature value is higher than the water inlet temperature.

14. Dishwasher (GS) according to claim 12 or 13, characterized in that the evaluation means are arranged such that a desorption at least partially in a program step (R, K) of a plurality of program steps (V, R, Z, K, T) in which heating means (HZ) of the dishwasher (GS) are operated when the air temperature is higher than the water supply temperature by at least a predetermined temperature value.

15. Dishwasher (GS) according to claim 13 or 14, characterized in that the predetermined temperature value is selected substantially between 3 to 30 ⁰ C, in particular between 5 and 15 ° C.

16. Dishwasher (GS) according to at least one of claims 13 to 15, characterized in that the desorption process at least partially during a program step cleaning (R) with detergent addition and cleaning action is feasible.

17. Dishwasher (GS) according to at least one of claims 13 to 16, characterized in that the desorption process at least partially during a program step pre-rinsing (V) with cleaning effect without detergent addition is feasible.

18. Dishwasher (GS) according to at least one of claims 13 to 17, characterized in that the desorption process at least partially during a program step rinsing (K) with rinse aid addition is feasible.

19. Dishwasher (GS) according to at least one of claims 13 to 18, characterized by a standing in heat-conducting contact with the environment of the dishwasher water tank for temporary storage of an amount of liquid, in particular a fresh water amount from a home-side water supply system.

0. Dishwasher (GS) according to at least one of claims 11 to 19, characterized in that the heating means (HZ) are designed as air heating.