DE102008040771A1 - Water-bearing household appliance e.g. dishwasher, operating method, involves occasionally heating gaseous medium and liquid medium with two heating element, respectively, and heating treatment goods with heated mediums - Google Patents

Abstract

The method involves occasionally heating a gaseous medium and a liquid medium with a heating element (24) and a water heater, respectively. Treatment goods are heated with the heated mediums. One of the heating elements is operated with a partial delivery of maximum power of the heating elements during simultaneous operation of the heating elements, where power consumption of the heating element remains below maximum power consumption of a water-bearing household appliance e.g. dishwasher, during simultaneous operation.

Description

The The invention relates to a method for operating a water-carrying Household appliance, in particular for a dishwasher or a washer-dryer according to the preamble of claim 1.

From the DE 10 2005 004 089 A1 a method for operating a water-conducting household appliance, ie a dishwasher known. As a drying system, a sorption device with reversibly dehydratable material is provided, which extracts a quantity of water in a drying step of the air to be dried and stores them. In a subsequent cleaning step, a regeneration process or a desorption is then carried out, in which an air stream flowing through the desiccant is heated by means of an air heater. With the heated air stream, the amount of water stored in the drying agent is released as hot steam and returned to the washing and heated to be cleaned items. However, this type of heating is time consuming.

It It is therefore an object of the invention to provide a method for operating a to provide a water-bearing household appliance, that allows a reduction in the time required.

The The invention is based on a method for operating a water-carrying Domestic appliance, in particular for a dishwasher or a washer dryer that has a plurality of consecutive Part program steps includes, of which in at least one partial program step at least temporarily a first medium with a first heating element warmed up and treated by exposure to the heated first medium is heated

According to the invention provided that at least temporarily in the partial program step at the same time heats a second medium with a second heating element and heats the material to be treated with the heated second medium becomes. This is due to the at least temporarily simultaneous Operation of two heating elements of the heating process accelerated and so the time required is reduced.

It it is further preferably provided that the first medium is a gaseous Medium and the second medium is a liquid medium. This reduces the higher heat capacity the liquid medium, the heating time. The warming the gaseous medium can be heated by an electric air heater, for example, supported by a fan blower to circulate the gaseous medium. The heating of the liquid medium can by a water heater, eg. Supported by circulation pump take place for circulation of the liquid medium.

Preferably is provided that during simultaneous operation the two heating elements of at least one of the two heating elements is operated with a partial power of its maximum power. So it is ensured that it is at least simultaneous by the at least Operation of the two heating elements does not lead to overheating within the water-bearing household appliance can come with the consequence, for example, a damage of a the two heating elements and / or a sorption with reversibly dehydratable material, for example zeolite.

Further is preferably provided that the power consumption of the first and second heating element with simultaneous operation below a maximum Power consumption of the water-conducting household appliance remains. The maximum power consumption is determined by the maximum power capacity of the house-side supply network that limits the energy supply of water-conducting household appliance with electric Energy serves. One the maximum power capacity of the house-side supply network exceeding power consumption of the water-conducting household appliance leads to an overload of the home-side supply network with the consequence that security elements, such. B. fuses or circuit breakers, trigger and another power supply is prevented. Thus, an uninterrupted operation of the water-bearing Household appliance guaranteed.

It can, for example, the first heating element for heating a gaseous Medium operated with a partial power of its maximum power become. Preferably, however, it is provided that the second heating element for heating a liquid medium with a Partial power of its maximum power is operated. Thus stands at the sole operation of the respective heating element a higher Heating power available, for example. On a liquid Medium as circulated rinsing liquor, heat up.

In a first, preferred embodiment is provided that at least one of the two heating elements at least two independently Has mutually operable heating segments. It can work For example, to two sections of serving as a tubular heater Water heater act. By appropriate on or off the at least two heating segments can increase the power or be lowered.

For this purpose, it is preferably provided that at least one of the two independently operable heating segments during operation of the whose heating element is operated.

In a further, preferred embodiment is provided the power consumption of the at least one heating element is reduced becomes.

For this is preferably provided in a first embodiment, that the power consumption of the second heating element by phase control is reduced. Thus, at least at the same time operation of the two Heating elements reduces power consumption while reducing Power dissipation.

In a second embodiment is preferably provided that the power consumption of the second heating element by full-wave control is reduced, so that reactive power losses are miniert and no disturbing reactions to a house-side Supply network occur.

It is further preferably provided that as the last part program step a drying step is carried out, wherein the second Medium is absorbed by a reversibly dehydratable material. Thus stands for a new treatment cycle again liquid stored in the reversibly dehydratable material to disposal.

there It is preferably provided that during a partial program step the reversibly dehydratable material is at least partially desorbed so that subsequently the reversibly dehydratable Material is resumable.

following are four embodiments of the invention with reference to the attached figures described.

It demonstrate:

1 a schematic block diagram of a dishwasher according to an embodiment,

2 in each case a temperature-time diagram representing the purification step and a heating-power-time diagram according to the first third embodiment, and

3 a block diagram of a dishwasher according to the 1 according to a second embodiment.

In the 1 is an embodiment of a water-conducting household appliance, a dishwasher with a washing 1 shown in the unillustrated, to be cleaned items to be washed in dish racks 3 . 5 can be arranged. In the washing container shown 1 are exemplary spray as two provided in different spray levels spray arms 7 . 9 arranged, via which the wash ware to be cleaned is applied with rinsing liquid. In the Spülbehälterboden is a pump pot 11 with a circulation pump 13 provided by the supply lines 14 . 15 fluidically with the spray arms 7 . 9 connected is. The sump 11 is also via connecting pieces with a fresh water supply line coupled to the water supply network 16 as well as with a drain line 17 in connection, in which a drain pump 18 for pumping out the rinsing liquid from the washing compartment is arranged.

The washing container 1 has an outlet opening in its upper area 19 on that over a line 21 with a sorption device 22 executed drying device is connected. In the line 21 to sorption 22 are an air blower 27 and a heating element 24 connected. The sorption device 22 contains as drying agent a reversibly dehydratable material, such as zeolite, with which in a drying step T air is dried. For this purpose, a loaded with high humidity airflow by means of the air blower 27 from the washing container 1 through the sorption device 22 directed. That in the sorption device 22 provided zeolite absorbs the moisture of the air and the comparatively dry air is returned to the washing 1 recycled.

The amount of water m ₂ stored in the zeolite in the drying step T can be achieved in a regeneration process, ie during desorption, by heating the desiccant of the sorption device 22 be released again. For this purpose, by means of the blower one from the heating element 24 heated to very high temperatures air flow through the sorption 22 passed with the stored water in the zeolite as hot water vapor and so back into the washing 1 is returned.

The first heating element 23 , ie the water heater, has two separate from each other from the control device 25 controllable heating segments 23a and 23b on. The two heating segments 23a and 23b are connected via signal lines with the control device 25 in connection. The two heating segments 23a . 23b work with different heat outputs Q _1a and Q _1b , each of which can be in a range of 800 W and 1,400 W.

That with the in the 1 The dishwashing process can be carried out using the time diagrams of the 2 describe. Consequently, the regeneration process Δt _{R of} the sorption device takes place within the purification step R ₁ in the heating-up phase Δt _H1 22 , The regeneration process starts in the present version Example with the beginning of the cleaning step R, in which usually a detergent is added to solve persistent stains. After completion of the regeneration process .DELTA.t _R , the rinsing liquid quantity heated by the water vapor released has a temperature T ₁ . The rinsing liquid is subsequently continued with the heating segments 23a . 23b the water heater 23 heated.

Specifically, the controller controls 25 simultaneously with the start of the regeneration operation .DELTA.t _R, the first, with lower heat output Q _1a working heating segment 23a at. As a result, according to the 2 for the heating of the rinsing liquid m _is both the heating power Q _{2 of} the air heater 24 as well as the lower heating power Q _1a available.

The sum of the heat outputs Q ₂ and Q _1a can in this case in a total of about a predetermined maximum in the rinsing liquid _is insertable m boundary heating power Q corresponding _limit at which excessive heating, that is, a thermal damage of the desiccant in the sorption 22 is excluded during the regeneration operation. After completion of the regeneration operation .DELTA.t _R then switches the controller 25 the second heating segment 23b to, giving a total of the full heating capacity (Q _1a + Q _1b ) of the water heater 23 for heating the rinsing liquid until reaching the cleaning temperature T _R is available.

Alternatively to the control of the two heating segments 23a and 23b the water heater can according to the in the 3 shown second embodiment, the control device 25 be involved in a heating power control, in which the heating power Q _{1 of} the water heater is controlled approximately by means of a known Phasenanschnitt- or full-wave control.

According to the embodiment of the 3 finds the regeneration process Δt _R - as in the 1 and 2 - Also during the heating phase .DELTA.t _H1 instead. The heating power control of the water heater 23 takes place parallel to the regeneration operation .DELTA.t _R such that excessive heating of the drying agent is prevented. At the same time, the heating output control regulates the water heating 23 to a target value of a predetermined, in the washing container 1 corresponds to maximum recoverable heating capacity, which may be at the rated power of the water heater.

Like from the 3 further shows, the heating power control takes place by means of a temperature sensor arranged in the water cycle of the dishwasher 29 , on the basis of which the control device 25 on the with the water heater 23 can conclude introduced heating power.

1

rinse tank

3

dish rack

5

dish rack

7

spray arm

9

spray arm

11

sump

13

circulating pump

14

supply

15

supply

16

Fresh water supply

17

drain line

18

Drain pump

19

outlet

21

management

22

drying device

23

air blower

24

heating element

25

control device

26

switch

27

air blower

29

temperature sensor

Δt _R

regeneration process

Δt _H1

heating phase

m _is

washing liquid

m ₁

supplied Fresh water

m ₂

recycled amount of water

t ₀

Start time of the purification step R

t _E

end time of the purification step R

Q ₁

heating capacity

Q ₂

heating capacity

Q _border

Cross-heating

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• DE 102005004089 A1 [0002]

Claims (12)

Method for operating a water-conducting domestic appliance, in particular for a dishwasher or a washer-dryer, comprising a plurality of successive partial program steps, of which in at least one partial program step at least temporarily a first medium with a first heating element ( 24 ) and material to be treated is heated by exposure to the heated first medium, characterized in that at least at times in the partial program step a second medium with a second heating element ( 23 ) and the material to be treated is heated with the heated second medium. Method of operating a water-bearing Domestic appliance according to claim 1, characterized in that that the first medium is a gaseous medium and the second Medium is a liquid medium. Method for operating a water-conducting household appliance according to claim 1 or 2, characterized in that during the simultaneous operation of the two heating elements ( 23 . 24 ) at least one of the two heating elements ( 23 . 24 ) is operated with a partial power of its maximum power. Method for operating a water-conducting household appliance according to claim 3, characterized in that the power consumption of the first and second heating elements ( 23 . 24 ) remains below a maximum power consumption of the water-conducting household appliance during simultaneous operation. Method for operating a water-conducting household appliance according to claim 3 or 4, characterized in that the second heating element ( 23 ) is operated with a partial power of its maximum power. Method for operating a water-conducting household appliance according to one of claims 3 to 5, characterized in that at least one of the two heating elements ( 23 . 24 ) at least two independently operable heating segments ( 23a . 23b ) having. Method for operating a water-conducting domestic appliance according to claim 6, characterized in that at least one of the two independently operable heating segments ( 23a . 23b ) when operating the other heating element ( 24 ) is operated. Method for operating a water-conducting domestic appliance according to one of claims 1 to 5, characterized in that the power consumption of the at least one heating element ( 23 ) is reduced. Method for operating a water-conducting domestic appliance according to claim 8, characterized in that the power consumption of the second heating element ( 23 ) is reduced by phase control. Method for operating a water-conducting domestic appliance according to claim 8, characterized in that the power consumption of the second heating element ( 23 ) is reduced by full-wave control. Method of operating a water-bearing Domestic appliance according to one of claims 1 or 10, characterized in that as the last part program step a drying step is carried out, wherein the second Medium is absorbed by a reversibly dehydratable material. Method of operating a water-bearing Domestic appliance according to one of claims 1 to 11, characterized in that during a partial program step the reversibly dehydratable material is at least partially desorbed becomes.